1 // Copyright 2012 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // This file defines all of the flags. It is separated into different section, 29 // for Debug, Release, Logging and Profiling, etc. To add a new flag, find the 30 // correct section, and use one of the DEFINE_ macros, without a trailing ';'. 31 // 32 // This include does not have a guard, because it is a template-style include, 33 // which can be included multiple times in different modes. It expects to have 34 // a mode defined before it's included. The modes are FLAG_MODE_... below: 35 36 // We want to declare the names of the variables for the header file. Normally 37 // this will just be an extern declaration, but for a readonly flag we let the 38 // compiler make better optimizations by giving it the value. 39 #if defined(FLAG_MODE_DECLARE) 40 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 41 extern ctype FLAG_##nam; 42 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) \ 43 static ctype const FLAG_##nam = def; 44 45 // We want to supply the actual storage and value for the flag variable in the 46 // .cc file. We only do this for writable flags. 47 #elif defined(FLAG_MODE_DEFINE) 48 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 49 ctype FLAG_##nam = def; 50 51 // We need to define all of our default values so that the Flag structure can 52 // access them by pointer. These are just used internally inside of one .cc, 53 // for MODE_META, so there is no impact on the flags interface. 54 #elif defined(FLAG_MODE_DEFINE_DEFAULTS) 55 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 56 static ctype const FLAGDEFAULT_##nam = def; 57 58 // We want to write entries into our meta data table, for internal parsing and 59 // printing / etc in the flag parser code. We only do this for writable flags. 60 #elif defined(FLAG_MODE_META) 61 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 62 { Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false }, 63 #define FLAG_ALIAS(ftype, ctype, alias, nam) \ 64 { Flag::TYPE_##ftype, #alias, &FLAG_##nam, &FLAGDEFAULT_##nam, \ 65 "alias for --"#nam, false }, 66 67 // We produce the code to set flags when it is implied by another flag. 68 #elif defined(FLAG_MODE_DEFINE_IMPLICATIONS) 69 #define DEFINE_implication(whenflag, thenflag) \ 70 if (FLAG_##whenflag) FLAG_##thenflag = true; 71 72 #else 73 #error No mode supplied when including flags.defs 74 #endif 75 76 // Dummy defines for modes where it is not relevant. 77 #ifndef FLAG_FULL 78 #define FLAG_FULL(ftype, ctype, nam, def, cmt) 79 #endif 80 81 #ifndef FLAG_READONLY 82 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) 83 #endif 84 85 #ifndef FLAG_ALIAS 86 #define FLAG_ALIAS(ftype, ctype, alias, nam) 87 #endif 88 89 #ifndef DEFINE_implication 90 #define DEFINE_implication(whenflag, thenflag) 91 #endif 92 93 #define COMMA , 94 95 #ifdef FLAG_MODE_DECLARE 96 // Structure used to hold a collection of arguments to the JavaScript code. 97 struct JSArguments { 98 public: 99 inline const char*& operator[] (int idx) const { 100 return argv[idx]; 101 } 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 #if (defined CAN_USE_VFP3_INSTRUCTIONS) || !(defined ARM_TEST) 125 # define ENABLE_VFP3_DEFAULT true 126 #else 127 # define ENABLE_VFP3_DEFAULT false 128 #endif 129 #if (defined CAN_USE_ARMV7_INSTRUCTIONS) || !(defined ARM_TEST) 130 # define ENABLE_ARMV7_DEFAULT true 131 #else 132 # define ENABLE_ARMV7_DEFAULT false 133 #endif 134 #if (defined CAN_USE_VFP32DREGS) || !(defined ARM_TEST) 135 # define ENABLE_32DREGS_DEFAULT true 136 #else 137 # define ENABLE_32DREGS_DEFAULT false 138 #endif 139 140 #define DEFINE_bool(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt) 141 #define DEFINE_maybe_bool(nam, cmt) FLAG(MAYBE_BOOL, MaybeBoolFlag, nam, \ 142 { false COMMA false }, cmt) 143 #define DEFINE_int(nam, def, cmt) FLAG(INT, int, nam, def, cmt) 144 #define DEFINE_float(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt) 145 #define DEFINE_string(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt) 146 #define DEFINE_args(nam, cmt) FLAG(ARGS, JSArguments, nam, \ 147 { 0 COMMA NULL }, cmt) 148 149 #define DEFINE_ALIAS_bool(alias, nam) FLAG_ALIAS(BOOL, bool, alias, nam) 150 #define DEFINE_ALIAS_int(alias, nam) FLAG_ALIAS(INT, int, alias, nam) 151 #define DEFINE_ALIAS_float(alias, nam) FLAG_ALIAS(FLOAT, double, alias, nam) 152 #define DEFINE_ALIAS_string(alias, nam) \ 153 FLAG_ALIAS(STRING, const char*, alias, nam) 154 #define DEFINE_ALIAS_args(alias, nam) FLAG_ALIAS(ARGS, JSArguments, alias, nam) 155 156 // 157 // Flags in all modes. 158 // 159 #define FLAG FLAG_FULL 160 161 // Flags for language modes and experimental language features. 162 DEFINE_bool(use_strict, false, "enforce strict mode") 163 DEFINE_bool(es5_readonly, true, 164 "activate correct semantics for inheriting readonliness") 165 DEFINE_bool(es52_globals, true, 166 "activate new semantics for global var declarations") 167 168 DEFINE_bool(harmony_typeof, false, "enable harmony semantics for typeof") 169 DEFINE_bool(harmony_scoping, false, "enable harmony block scoping") 170 DEFINE_bool(harmony_modules, false, 171 "enable harmony modules (implies block scoping)") 172 DEFINE_bool(harmony_symbols, false, 173 "enable harmony symbols (a.k.a. private names)") 174 DEFINE_bool(harmony_promises, false, "enable harmony promises") 175 DEFINE_bool(harmony_proxies, false, "enable harmony proxies") 176 DEFINE_bool(harmony_collections, false, 177 "enable harmony collections (sets, maps, and weak maps)") 178 DEFINE_bool(harmony_observation, false, 179 "enable harmony object observation (implies harmony collections") 180 DEFINE_bool(harmony_generators, false, "enable harmony generators") 181 DEFINE_bool(harmony_iteration, false, "enable harmony iteration (for-of)") 182 DEFINE_bool(harmony_numeric_literals, false, 183 "enable harmony numeric literals (0o77, 0b11)") 184 DEFINE_bool(harmony_strings, false, "enable harmony string") 185 DEFINE_bool(harmony_arrays, false, "enable harmony arrays") 186 DEFINE_bool(harmony_maths, false, "enable harmony math functions") 187 DEFINE_bool(harmony, false, "enable all harmony features (except typeof)") 188 DEFINE_implication(harmony, harmony_scoping) 189 DEFINE_implication(harmony, harmony_modules) 190 DEFINE_implication(harmony, harmony_symbols) 191 DEFINE_implication(harmony, harmony_promises) 192 DEFINE_implication(harmony, harmony_proxies) 193 DEFINE_implication(harmony, harmony_collections) 194 DEFINE_implication(harmony, harmony_observation) 195 DEFINE_implication(harmony, harmony_generators) 196 DEFINE_implication(harmony, harmony_iteration) 197 DEFINE_implication(harmony, harmony_numeric_literals) 198 DEFINE_implication(harmony, harmony_strings) 199 DEFINE_implication(harmony, harmony_arrays) 200 DEFINE_implication(harmony, harmony_maths) 201 DEFINE_implication(harmony_promises, harmony_collections) 202 DEFINE_implication(harmony_modules, harmony_scoping) 203 DEFINE_implication(harmony_observation, harmony_collections) 204 205 // Flags for experimental implementation features. 206 DEFINE_bool(packed_arrays, true, "optimizes arrays that have no holes") 207 DEFINE_bool(smi_only_arrays, true, "tracks arrays with only smi values") 208 DEFINE_bool(compiled_keyed_dictionary_loads, true, 209 "use optimizing compiler to generate keyed dictionary load stubs") 210 DEFINE_bool(clever_optimizations, true, 211 "Optimize object size, Array shift, DOM strings and string +") 212 DEFINE_bool(pretenuring, true, "allocate objects in old space") 213 // TODO(hpayer): We will remove this flag as soon as we have pretenuring 214 // support for specific allocation sites. 215 DEFINE_bool(pretenuring_call_new, false, "pretenure call new") 216 DEFINE_bool(allocation_site_pretenuring, false, 217 "pretenure with allocation sites") 218 DEFINE_bool(trace_pretenuring, false, 219 "trace pretenuring decisions of HAllocate instructions") 220 DEFINE_bool(track_fields, true, "track fields with only smi values") 221 DEFINE_bool(track_double_fields, true, "track fields with double values") 222 DEFINE_bool(track_heap_object_fields, true, "track fields with heap values") 223 DEFINE_bool(track_computed_fields, true, "track computed boilerplate fields") 224 DEFINE_implication(track_double_fields, track_fields) 225 DEFINE_implication(track_heap_object_fields, track_fields) 226 DEFINE_implication(track_computed_fields, track_fields) 227 DEFINE_bool(smi_binop, true, "support smi representation in binary operations") 228 229 // Flags for optimization types. 230 DEFINE_bool(optimize_for_size, false, 231 "Enables optimizations which favor memory size over execution " 232 "speed.") 233 234 // Flags for data representation optimizations 235 DEFINE_bool(unbox_double_arrays, true, "automatically unbox arrays of doubles") 236 DEFINE_bool(string_slices, true, "use string slices") 237 238 // Flags for Crankshaft. 239 DEFINE_bool(crankshaft, true, "use crankshaft") 240 DEFINE_string(hydrogen_filter, "*", "optimization filter") 241 DEFINE_bool(use_range, true, "use hydrogen range analysis") 242 DEFINE_bool(use_gvn, true, "use hydrogen global value numbering") 243 DEFINE_bool(use_canonicalizing, true, "use hydrogen instruction canonicalizing") 244 DEFINE_bool(use_inlining, true, "use function inlining") 245 DEFINE_bool(use_escape_analysis, false, "use hydrogen escape analysis") 246 DEFINE_bool(use_allocation_folding, true, "use allocation folding") 247 DEFINE_int(max_inlining_levels, 5, "maximum number of inlining levels") 248 DEFINE_int(max_inlined_source_size, 600, 249 "maximum source size in bytes considered for a single inlining") 250 DEFINE_int(max_inlined_nodes, 196, 251 "maximum number of AST nodes considered for a single inlining") 252 DEFINE_int(max_inlined_nodes_cumulative, 400, 253 "maximum cumulative number of AST nodes considered for inlining") 254 DEFINE_bool(loop_invariant_code_motion, true, "loop invariant code motion") 255 DEFINE_bool(fast_math, true, "faster (but maybe less accurate) math functions") 256 DEFINE_bool(collect_megamorphic_maps_from_stub_cache, true, 257 "crankshaft harvests type feedback from stub cache") 258 DEFINE_bool(hydrogen_stats, false, "print statistics for hydrogen") 259 DEFINE_bool(trace_check_elimination, false, "trace check elimination phase") 260 DEFINE_bool(trace_hydrogen, false, "trace generated hydrogen to file") 261 DEFINE_string(trace_hydrogen_filter, "*", "hydrogen tracing filter") 262 DEFINE_bool(trace_hydrogen_stubs, false, "trace generated hydrogen for stubs") 263 DEFINE_string(trace_hydrogen_file, NULL, "trace hydrogen to given file name") 264 DEFINE_string(trace_phase, "HLZ", "trace generated IR for specified phases") 265 DEFINE_bool(trace_inlining, false, "trace inlining decisions") 266 DEFINE_bool(trace_load_elimination, false, "trace load elimination") 267 DEFINE_bool(trace_alloc, false, "trace register allocator") 268 DEFINE_bool(trace_all_uses, false, "trace all use positions") 269 DEFINE_bool(trace_range, false, "trace range analysis") 270 DEFINE_bool(trace_gvn, false, "trace global value numbering") 271 DEFINE_bool(trace_representation, false, "trace representation types") 272 DEFINE_bool(trace_escape_analysis, false, "trace hydrogen escape analysis") 273 DEFINE_bool(trace_allocation_folding, false, "trace allocation folding") 274 DEFINE_bool(trace_track_allocation_sites, false, 275 "trace the tracking of allocation sites") 276 DEFINE_bool(trace_migration, false, "trace object migration") 277 DEFINE_bool(trace_generalization, false, "trace map generalization") 278 DEFINE_bool(stress_pointer_maps, false, "pointer map for every instruction") 279 DEFINE_bool(stress_environments, false, "environment for every instruction") 280 DEFINE_int(deopt_every_n_times, 0, 281 "deoptimize every n times a deopt point is passed") 282 DEFINE_int(deopt_every_n_garbage_collections, 0, 283 "deoptimize every n garbage collections") 284 DEFINE_bool(print_deopt_stress, false, "print number of possible deopt points") 285 DEFINE_bool(trap_on_deopt, false, "put a break point before deoptimizing") 286 DEFINE_bool(trap_on_stub_deopt, false, 287 "put a break point before deoptimizing a stub") 288 DEFINE_bool(deoptimize_uncommon_cases, true, "deoptimize uncommon cases") 289 DEFINE_bool(polymorphic_inlining, true, "polymorphic inlining") 290 DEFINE_bool(use_osr, true, "use on-stack replacement") 291 DEFINE_bool(array_bounds_checks_elimination, true, 292 "perform array bounds checks elimination") 293 DEFINE_bool(array_bounds_checks_hoisting, false, 294 "perform array bounds checks hoisting") 295 DEFINE_bool(array_index_dehoisting, true, 296 "perform array index dehoisting") 297 DEFINE_bool(analyze_environment_liveness, true, 298 "analyze liveness of environment slots and zap dead values") 299 DEFINE_bool(load_elimination, true, "use load elimination") 300 DEFINE_bool(check_elimination, false, "use check elimination") 301 DEFINE_bool(dead_code_elimination, true, "use dead code elimination") 302 DEFINE_bool(fold_constants, true, "use constant folding") 303 DEFINE_bool(trace_dead_code_elimination, false, "trace dead code elimination") 304 DEFINE_bool(unreachable_code_elimination, true, "eliminate unreachable code") 305 DEFINE_bool(track_allocation_sites, true, 306 "Use allocation site info to reduce transitions") 307 DEFINE_bool(trace_osr, false, "trace on-stack replacement") 308 DEFINE_int(stress_runs, 0, "number of stress runs") 309 DEFINE_bool(optimize_closures, true, "optimize closures") 310 DEFINE_bool(lookup_sample_by_shared, true, 311 "when picking a function to optimize, watch for shared function " 312 "info, not JSFunction itself") 313 DEFINE_bool(cache_optimized_code, true, 314 "cache optimized code for closures") 315 DEFINE_bool(flush_optimized_code_cache, true, 316 "flushes the cache of optimized code for closures on every GC") 317 DEFINE_bool(inline_construct, true, "inline constructor calls") 318 DEFINE_bool(inline_arguments, true, "inline functions with arguments object") 319 DEFINE_bool(inline_accessors, true, "inline JavaScript accessors") 320 DEFINE_int(loop_weight, 1, "loop weight for representation inference") 321 DEFINE_int(escape_analysis_iterations, 2, 322 "maximum number of escape analysis fix-point iterations") 323 324 DEFINE_bool(optimize_for_in, true, 325 "optimize functions containing for-in loops") 326 DEFINE_bool(opt_safe_uint32_operations, true, 327 "allow uint32 values on optimize frames if they are used only in " 328 "safe operations") 329 330 DEFINE_bool(concurrent_recompilation, true, 331 "optimizing hot functions asynchronously on a separate thread") 332 DEFINE_bool(trace_concurrent_recompilation, false, 333 "track concurrent recompilation") 334 DEFINE_int(concurrent_recompilation_queue_length, 8, 335 "the length of the concurrent compilation queue") 336 DEFINE_int(concurrent_recompilation_delay, 0, 337 "artificial compilation delay in ms") 338 DEFINE_bool(block_concurrent_recompilation, false, 339 "block queued jobs until released") 340 DEFINE_bool(concurrent_osr, false, 341 "concurrent on-stack replacement") 342 DEFINE_implication(concurrent_osr, concurrent_recompilation) 343 344 DEFINE_bool(omit_map_checks_for_leaf_maps, true, 345 "do not emit check maps for constant values that have a leaf map, " 346 "deoptimize the optimized code if the layout of the maps changes.") 347 348 DEFINE_bool(new_string_add, true, "enable new string addition") 349 350 // Experimental profiler changes. 351 DEFINE_bool(experimental_profiler, true, "enable all profiler experiments") 352 DEFINE_bool(watch_ic_patching, false, "profiler considers IC stability") 353 DEFINE_int(frame_count, 1, "number of stack frames inspected by the profiler") 354 DEFINE_bool(self_optimization, false, 355 "primitive functions trigger their own optimization") 356 DEFINE_bool(direct_self_opt, false, 357 "call recompile stub directly when self-optimizing") 358 DEFINE_bool(retry_self_opt, false, "re-try self-optimization if it failed") 359 DEFINE_bool(interrupt_at_exit, false, 360 "insert an interrupt check at function exit") 361 DEFINE_bool(weighted_back_edges, false, 362 "weight back edges by jump distance for interrupt triggering") 363 // 0x1700 fits in the immediate field of an ARM instruction. 364 DEFINE_int(interrupt_budget, 0x1700, 365 "execution budget before interrupt is triggered") 366 DEFINE_int(type_info_threshold, 25, 367 "percentage of ICs that must have type info to allow optimization") 368 DEFINE_int(self_opt_count, 130, "call count before self-optimization") 369 370 DEFINE_implication(experimental_profiler, watch_ic_patching) 371 DEFINE_implication(experimental_profiler, self_optimization) 372 // Not implying direct_self_opt here because it seems to be a bad idea. 373 DEFINE_implication(experimental_profiler, retry_self_opt) 374 DEFINE_implication(experimental_profiler, interrupt_at_exit) 375 DEFINE_implication(experimental_profiler, weighted_back_edges) 376 377 DEFINE_bool(trace_opt_verbose, false, "extra verbose compilation tracing") 378 DEFINE_implication(trace_opt_verbose, trace_opt) 379 380 // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc 381 DEFINE_bool(debug_code, false, 382 "generate extra code (assertions) for debugging") 383 DEFINE_bool(code_comments, false, "emit comments in code disassembly") 384 DEFINE_bool(enable_sse2, true, 385 "enable use of SSE2 instructions if available") 386 DEFINE_bool(enable_sse3, true, 387 "enable use of SSE3 instructions if available") 388 DEFINE_bool(enable_sse4_1, true, 389 "enable use of SSE4.1 instructions if available") 390 DEFINE_bool(enable_cmov, true, 391 "enable use of CMOV instruction if available") 392 DEFINE_bool(enable_sahf, true, 393 "enable use of SAHF instruction if available (X64 only)") 394 DEFINE_bool(enable_vfp3, ENABLE_VFP3_DEFAULT, 395 "enable use of VFP3 instructions if available") 396 DEFINE_bool(enable_armv7, ENABLE_ARMV7_DEFAULT, 397 "enable use of ARMv7 instructions if available (ARM only)") 398 DEFINE_bool(enable_neon, true, 399 "enable use of NEON instructions if available (ARM only)") 400 DEFINE_bool(enable_sudiv, true, 401 "enable use of SDIV and UDIV instructions if available (ARM only)") 402 DEFINE_bool(enable_movw_movt, false, 403 "enable loading 32-bit constant by means of movw/movt " 404 "instruction pairs (ARM only)") 405 DEFINE_bool(enable_unaligned_accesses, true, 406 "enable unaligned accesses for ARMv7 (ARM only)") 407 DEFINE_bool(enable_32dregs, ENABLE_32DREGS_DEFAULT, 408 "enable use of d16-d31 registers on ARM - this requires VFP3") 409 DEFINE_bool(enable_vldr_imm, false, 410 "enable use of constant pools for double immediate (ARM only)") 411 412 // bootstrapper.cc 413 DEFINE_string(expose_natives_as, NULL, "expose natives in global object") 414 DEFINE_string(expose_debug_as, NULL, "expose debug in global object") 415 #ifdef ADDRESS_SANITIZER 416 DEFINE_bool(expose_free_buffer, false, "expose freeBuffer extension") 417 #endif 418 DEFINE_bool(expose_gc, false, "expose gc extension") 419 DEFINE_string(expose_gc_as, NULL, 420 "expose gc extension under the specified name") 421 DEFINE_implication(expose_gc_as, expose_gc) 422 DEFINE_bool(expose_externalize_string, false, 423 "expose externalize string extension") 424 DEFINE_int(stack_trace_limit, 10, "number of stack frames to capture") 425 DEFINE_bool(builtins_in_stack_traces, false, 426 "show built-in functions in stack traces") 427 DEFINE_bool(disable_native_files, false, "disable builtin natives files") 428 429 // builtins-ia32.cc 430 DEFINE_bool(inline_new, true, "use fast inline allocation") 431 432 // checks.cc 433 DEFINE_bool(stack_trace_on_abort, true, 434 "print a stack trace if an assertion failure occurs") 435 436 // codegen-ia32.cc / codegen-arm.cc 437 DEFINE_bool(trace_codegen, false, 438 "print name of functions for which code is generated") 439 DEFINE_bool(trace, false, "trace function calls") 440 DEFINE_bool(mask_constants_with_cookie, true, 441 "use random jit cookie to mask large constants") 442 443 // codegen.cc 444 DEFINE_bool(lazy, true, "use lazy compilation") 445 DEFINE_bool(trace_opt, false, "trace lazy optimization") 446 DEFINE_bool(trace_opt_stats, false, "trace lazy optimization statistics") 447 DEFINE_bool(opt, true, "use adaptive optimizations") 448 DEFINE_bool(always_opt, false, "always try to optimize functions") 449 DEFINE_bool(always_osr, false, "always try to OSR functions") 450 DEFINE_bool(prepare_always_opt, false, "prepare for turning on always opt") 451 DEFINE_bool(trace_deopt, false, "trace optimize function deoptimization") 452 DEFINE_bool(trace_stub_failures, false, 453 "trace deoptimization of generated code stubs") 454 455 // compiler.cc 456 DEFINE_int(min_preparse_length, 1024, 457 "minimum length for automatic enable preparsing") 458 DEFINE_bool(always_full_compiler, false, 459 "try to use the dedicated run-once backend for all code") 460 DEFINE_int(max_opt_count, 10, 461 "maximum number of optimization attempts before giving up.") 462 463 // compilation-cache.cc 464 DEFINE_bool(compilation_cache, true, "enable compilation cache") 465 466 DEFINE_bool(cache_prototype_transitions, true, "cache prototype transitions") 467 468 // cpu-profiler.cc 469 DEFINE_int(cpu_profiler_sampling_interval, 1000, 470 "CPU profiler sampling interval in microseconds") 471 472 // debug.cc 473 DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response") 474 DEFINE_bool(trace_js_array_abuse, false, 475 "trace out-of-bounds accesses to JS arrays") 476 DEFINE_bool(trace_external_array_abuse, false, 477 "trace out-of-bounds-accesses to external arrays") 478 DEFINE_bool(trace_array_abuse, false, 479 "trace out-of-bounds accesses to all arrays") 480 DEFINE_implication(trace_array_abuse, trace_js_array_abuse) 481 DEFINE_implication(trace_array_abuse, trace_external_array_abuse) 482 DEFINE_bool(debugger_auto_break, true, 483 "automatically set the debug break flag when debugger commands are " 484 "in the queue") 485 DEFINE_bool(enable_liveedit, true, "enable liveedit experimental feature") 486 DEFINE_bool(break_on_abort, true, "always cause a debug break before aborting") 487 488 // execution.cc 489 // Slightly less than 1MB on 64-bit, since Windows' default stack size for 490 // the main execution thread is 1MB for both 32 and 64-bit. 491 DEFINE_int(stack_size, kPointerSize * 123, 492 "default size of stack region v8 is allowed to use (in kBytes)") 493 494 // frames.cc 495 DEFINE_int(max_stack_trace_source_length, 300, 496 "maximum length of function source code printed in a stack trace.") 497 498 // full-codegen.cc 499 DEFINE_bool(always_inline_smi_code, false, 500 "always inline smi code in non-opt code") 501 502 // heap.cc 503 DEFINE_int(max_new_space_size, 0, "max size of the new generation (in kBytes)") 504 DEFINE_int(max_old_space_size, 0, "max size of the old generation (in Mbytes)") 505 DEFINE_int(max_executable_size, 0, "max size of executable memory (in Mbytes)") 506 DEFINE_bool(gc_global, false, "always perform global GCs") 507 DEFINE_int(gc_interval, -1, "garbage collect after <n> allocations") 508 DEFINE_bool(trace_gc, false, 509 "print one trace line following each garbage collection") 510 DEFINE_bool(trace_gc_nvp, false, 511 "print one detailed trace line in name=value format " 512 "after each garbage collection") 513 DEFINE_bool(trace_gc_ignore_scavenger, false, 514 "do not print trace line after scavenger collection") 515 DEFINE_bool(print_cumulative_gc_stat, false, 516 "print cumulative GC statistics in name=value format on exit") 517 DEFINE_bool(print_max_heap_committed, false, 518 "print statistics of the maximum memory committed for the heap " 519 "in name=value format on exit") 520 DEFINE_bool(trace_gc_verbose, false, 521 "print more details following each garbage collection") 522 DEFINE_bool(trace_fragmentation, false, 523 "report fragmentation for old pointer and data pages") 524 DEFINE_bool(trace_external_memory, false, 525 "print amount of external allocated memory after each time " 526 "it is adjusted.") 527 DEFINE_bool(collect_maps, true, 528 "garbage collect maps from which no objects can be reached") 529 DEFINE_bool(weak_embedded_maps_in_optimized_code, true, 530 "make maps embedded in optimized code weak") 531 DEFINE_bool(weak_embedded_objects_in_optimized_code, true, 532 "make objects embedded in optimized code weak") 533 DEFINE_bool(flush_code, true, 534 "flush code that we expect not to use again (during full gc)") 535 DEFINE_bool(flush_code_incrementally, true, 536 "flush code that we expect not to use again (incrementally)") 537 DEFINE_bool(trace_code_flushing, false, "trace code flushing progress") 538 DEFINE_bool(age_code, true, 539 "track un-executed functions to age code and flush only " 540 "old code (required for code flushing)") 541 DEFINE_bool(incremental_marking, true, "use incremental marking") 542 DEFINE_bool(incremental_marking_steps, true, "do incremental marking steps") 543 DEFINE_bool(trace_incremental_marking, false, 544 "trace progress of the incremental marking") 545 DEFINE_bool(track_gc_object_stats, false, 546 "track object counts and memory usage") 547 DEFINE_bool(parallel_sweeping, true, "enable parallel sweeping") 548 DEFINE_bool(concurrent_sweeping, false, "enable concurrent sweeping") 549 DEFINE_int(sweeper_threads, 0, 550 "number of parallel and concurrent sweeping threads") 551 #ifdef VERIFY_HEAP 552 DEFINE_bool(verify_heap, false, "verify heap pointers before and after GC") 553 #endif 554 555 556 // heap-snapshot-generator.cc 557 DEFINE_bool(heap_profiler_trace_objects, false, 558 "Dump heap object allocations/movements/size_updates") 559 560 561 // v8.cc 562 DEFINE_bool(use_idle_notification, true, 563 "Use idle notification to reduce memory footprint.") 564 // ic.cc 565 DEFINE_bool(use_ic, true, "use inline caching") 566 567 // macro-assembler-ia32.cc 568 DEFINE_bool(native_code_counters, false, 569 "generate extra code for manipulating stats counters") 570 571 // mark-compact.cc 572 DEFINE_bool(always_compact, false, "Perform compaction on every full GC") 573 DEFINE_bool(lazy_sweeping, true, 574 "Use lazy sweeping for old pointer and data spaces") 575 DEFINE_bool(never_compact, false, 576 "Never perform compaction on full GC - testing only") 577 DEFINE_bool(compact_code_space, true, 578 "Compact code space on full non-incremental collections") 579 DEFINE_bool(incremental_code_compaction, true, 580 "Compact code space on full incremental collections") 581 DEFINE_bool(cleanup_code_caches_at_gc, true, 582 "Flush inline caches prior to mark compact collection and " 583 "flush code caches in maps during mark compact cycle.") 584 DEFINE_bool(use_marking_progress_bar, true, 585 "Use a progress bar to scan large objects in increments when " 586 "incremental marking is active.") 587 DEFINE_int(random_seed, 0, 588 "Default seed for initializing random generator " 589 "(0, the default, means to use system random).") 590 591 // objects.cc 592 DEFINE_bool(use_verbose_printer, true, "allows verbose printing") 593 594 // parser.cc 595 DEFINE_bool(allow_natives_syntax, false, "allow natives syntax") 596 DEFINE_bool(trace_parse, false, "trace parsing and preparsing") 597 598 // simulator-arm.cc and simulator-mips.cc 599 DEFINE_bool(trace_sim, false, "Trace simulator execution") 600 DEFINE_bool(check_icache, false, 601 "Check icache flushes in ARM and MIPS simulator") 602 DEFINE_int(stop_sim_at, 0, "Simulator stop after x number of instructions") 603 DEFINE_int(sim_stack_alignment, 8, 604 "Stack alingment in bytes in simulator (4 or 8, 8 is default)") 605 606 // isolate.cc 607 DEFINE_bool(abort_on_uncaught_exception, false, 608 "abort program (dump core) when an uncaught exception is thrown") 609 DEFINE_bool(trace_exception, false, 610 "print stack trace when throwing exceptions") 611 DEFINE_bool(randomize_hashes, true, 612 "randomize hashes to avoid predictable hash collisions " 613 "(with snapshots this option cannot override the baked-in seed)") 614 DEFINE_int(hash_seed, 0, 615 "Fixed seed to use to hash property keys (0 means random)" 616 "(with snapshots this option cannot override the baked-in seed)") 617 618 // snapshot-common.cc 619 DEFINE_bool(profile_deserialization, false, 620 "Print the time it takes to deserialize the snapshot.") 621 622 // Regexp 623 DEFINE_bool(regexp_optimization, true, "generate optimized regexp code") 624 625 // Testing flags test/cctest/test-{flags,api,serialization}.cc 626 DEFINE_bool(testing_bool_flag, true, "testing_bool_flag") 627 DEFINE_maybe_bool(testing_maybe_bool_flag, "testing_maybe_bool_flag") 628 DEFINE_int(testing_int_flag, 13, "testing_int_flag") 629 DEFINE_float(testing_float_flag, 2.5, "float-flag") 630 DEFINE_string(testing_string_flag, "Hello, world!", "string-flag") 631 DEFINE_int(testing_prng_seed, 42, "Seed used for threading test randomness") 632 #ifdef _WIN32 633 DEFINE_string(testing_serialization_file, "C:\\Windows\\Temp\\serdes", 634 "file in which to testing_serialize heap") 635 #else 636 DEFINE_string(testing_serialization_file, "/tmp/serdes", 637 "file in which to serialize heap") 638 #endif 639 640 // mksnapshot.cc 641 DEFINE_string(extra_code, NULL, "A filename with extra code to be included in" 642 " the snapshot (mksnapshot only)") 643 644 // code-stubs-hydrogen.cc 645 DEFINE_bool(profile_hydrogen_code_stub_compilation, false, 646 "Print the time it takes to lazily compile hydrogen code stubs.") 647 648 // 649 // Dev shell flags 650 // 651 652 DEFINE_bool(help, false, "Print usage message, including flags, on console") 653 DEFINE_bool(dump_counters, false, "Dump counters on exit") 654 655 #ifdef ENABLE_DEBUGGER_SUPPORT 656 DEFINE_bool(debugger, false, "Enable JavaScript debugger") 657 DEFINE_bool(remote_debugger, false, "Connect JavaScript debugger to the " 658 "debugger agent in another process") 659 DEFINE_bool(debugger_agent, false, "Enable debugger agent") 660 DEFINE_int(debugger_port, 5858, "Port to use for remote debugging") 661 #endif // ENABLE_DEBUGGER_SUPPORT 662 663 DEFINE_string(map_counters, "", "Map counters to a file") 664 DEFINE_args(js_arguments, 665 "Pass all remaining arguments to the script. Alias for \"--\".") 666 667 #if defined(WEBOS__) 668 DEFINE_bool(debug_compile_events, false, "Enable debugger compile events") 669 DEFINE_bool(debug_script_collected_events, false, 670 "Enable debugger script collected events") 671 #else 672 DEFINE_bool(debug_compile_events, true, "Enable debugger compile events") 673 DEFINE_bool(debug_script_collected_events, true, 674 "Enable debugger script collected events") 675 #endif 676 677 678 // 679 // GDB JIT integration flags. 680 // 681 682 DEFINE_bool(gdbjit, false, "enable GDBJIT interface (disables compacting GC)") 683 DEFINE_bool(gdbjit_full, false, "enable GDBJIT interface for all code objects") 684 DEFINE_bool(gdbjit_dump, false, "dump elf objects with debug info to disk") 685 DEFINE_string(gdbjit_dump_filter, "", 686 "dump only objects containing this substring") 687 688 // mark-compact.cc 689 DEFINE_bool(force_marking_deque_overflows, false, 690 "force overflows of marking deque by reducing it's size " 691 "to 64 words") 692 693 DEFINE_bool(stress_compaction, false, 694 "stress the GC compactor to flush out bugs (implies " 695 "--force_marking_deque_overflows)") 696 697 // 698 // Debug only flags 699 // 700 #undef FLAG 701 #ifdef DEBUG 702 #define FLAG FLAG_FULL 703 #else 704 #define FLAG FLAG_READONLY 705 #endif 706 707 // checks.cc 708 #ifdef ENABLE_SLOW_ASSERTS 709 DEFINE_bool(enable_slow_asserts, false, 710 "enable asserts that are slow to execute") 711 #endif 712 713 // codegen-ia32.cc / codegen-arm.cc / macro-assembler-*.cc 714 DEFINE_bool(print_source, false, "pretty print source code") 715 DEFINE_bool(print_builtin_source, false, 716 "pretty print source code for builtins") 717 DEFINE_bool(print_ast, false, "print source AST") 718 DEFINE_bool(print_builtin_ast, false, "print source AST for builtins") 719 DEFINE_string(stop_at, "", "function name where to insert a breakpoint") 720 DEFINE_bool(trap_on_abort, false, "replace aborts by breakpoints") 721 722 // compiler.cc 723 DEFINE_bool(print_builtin_scopes, false, "print scopes for builtins") 724 DEFINE_bool(print_scopes, false, "print scopes") 725 726 // contexts.cc 727 DEFINE_bool(trace_contexts, false, "trace contexts operations") 728 729 // heap.cc 730 DEFINE_bool(gc_greedy, false, "perform GC prior to some allocations") 731 DEFINE_bool(gc_verbose, false, "print stuff during garbage collection") 732 DEFINE_bool(heap_stats, false, "report heap statistics before and after GC") 733 DEFINE_bool(code_stats, false, "report code statistics after GC") 734 DEFINE_bool(verify_native_context_separation, false, 735 "verify that code holds on to at most one native context after GC") 736 DEFINE_bool(print_handles, false, "report handles after GC") 737 DEFINE_bool(print_global_handles, false, "report global handles after GC") 738 739 // ic.cc 740 DEFINE_bool(trace_ic, false, "trace inline cache state transitions") 741 742 // interface.cc 743 DEFINE_bool(print_interfaces, false, "print interfaces") 744 DEFINE_bool(print_interface_details, false, "print interface inference details") 745 DEFINE_int(print_interface_depth, 5, "depth for printing interfaces") 746 747 // objects.cc 748 DEFINE_bool(trace_normalization, false, 749 "prints when objects are turned into dictionaries.") 750 751 // runtime.cc 752 DEFINE_bool(trace_lazy, false, "trace lazy compilation") 753 754 // spaces.cc 755 DEFINE_bool(collect_heap_spill_statistics, false, 756 "report heap spill statistics along with heap_stats " 757 "(requires heap_stats)") 758 759 DEFINE_bool(trace_isolates, false, "trace isolate state changes") 760 761 // Regexp 762 DEFINE_bool(regexp_possessive_quantifier, false, 763 "enable possessive quantifier syntax for testing") 764 DEFINE_bool(trace_regexp_bytecodes, false, "trace regexp bytecode execution") 765 DEFINE_bool(trace_regexp_assembler, false, 766 "trace regexp macro assembler calls.") 767 768 // 769 // Logging and profiling flags 770 // 771 #undef FLAG 772 #define FLAG FLAG_FULL 773 774 // log.cc 775 DEFINE_bool(log, false, 776 "Minimal logging (no API, code, GC, suspect, or handles samples).") 777 DEFINE_bool(log_all, false, "Log all events to the log file.") 778 DEFINE_bool(log_runtime, false, "Activate runtime system %Log call.") 779 DEFINE_bool(log_api, false, "Log API events to the log file.") 780 DEFINE_bool(log_code, false, 781 "Log code events to the log file without profiling.") 782 DEFINE_bool(log_gc, false, 783 "Log heap samples on garbage collection for the hp2ps tool.") 784 DEFINE_bool(log_handles, false, "Log global handle events.") 785 DEFINE_bool(log_snapshot_positions, false, 786 "log positions of (de)serialized objects in the snapshot.") 787 DEFINE_bool(log_suspect, false, "Log suspect operations.") 788 DEFINE_bool(prof, false, 789 "Log statistical profiling information (implies --log-code).") 790 DEFINE_bool(prof_browser_mode, true, 791 "Used with --prof, turns on browser-compatible mode for profiling.") 792 DEFINE_bool(log_regexp, false, "Log regular expression execution.") 793 DEFINE_string(logfile, "v8.log", "Specify the name of the log file.") 794 DEFINE_bool(logfile_per_isolate, true, "Separate log files for each isolate.") 795 DEFINE_bool(ll_prof, false, "Enable low-level linux profiler.") 796 DEFINE_bool(perf_basic_prof, false, 797 "Enable perf linux profiler (basic support).") 798 DEFINE_bool(perf_jit_prof, false, 799 "Enable perf linux profiler (experimental annotate support).") 800 DEFINE_string(gc_fake_mmap, "/tmp/__v8_gc__", 801 "Specify the name of the file for fake gc mmap used in ll_prof") 802 DEFINE_bool(log_internal_timer_events, false, "Time internal events.") 803 DEFINE_bool(log_timer_events, false, 804 "Time events including external callbacks.") 805 DEFINE_implication(log_timer_events, log_internal_timer_events) 806 DEFINE_implication(log_internal_timer_events, prof) 807 808 DEFINE_bool(redirect_code_traces, false, 809 "output deopt information and disassembly into file " 810 "code-<pid>-<isolate id>.asm") 811 DEFINE_string(redirect_code_traces_to, NULL, 812 "output deopt information and disassembly into the given file") 813 814 // 815 // Disassembler only flags 816 // 817 #undef FLAG 818 #ifdef ENABLE_DISASSEMBLER 819 #define FLAG FLAG_FULL 820 #else 821 #define FLAG FLAG_READONLY 822 #endif 823 824 // elements.cc 825 DEFINE_bool(trace_elements_transitions, false, "trace elements transitions") 826 827 DEFINE_bool(trace_creation_allocation_sites, false, 828 "trace the creation of allocation sites") 829 830 // code-stubs.cc 831 DEFINE_bool(print_code_stubs, false, "print code stubs") 832 DEFINE_bool(test_secondary_stub_cache, false, 833 "test secondary stub cache by disabling the primary one") 834 835 DEFINE_bool(test_primary_stub_cache, false, 836 "test primary stub cache by disabling the secondary one") 837 838 839 // codegen-ia32.cc / codegen-arm.cc 840 DEFINE_bool(print_code, false, "print generated code") 841 DEFINE_bool(print_opt_code, false, "print optimized code") 842 DEFINE_bool(print_unopt_code, false, "print unoptimized code before " 843 "printing optimized code based on it") 844 DEFINE_bool(print_code_verbose, false, "print more information for code") 845 DEFINE_bool(print_builtin_code, false, "print generated code for builtins") 846 DEFINE_bool(emit_opt_code_positions, false, 847 "annotate optimize code with source code positions") 848 849 #ifdef ENABLE_DISASSEMBLER 850 DEFINE_bool(sodium, false, "print generated code output suitable for use with " 851 "the Sodium code viewer") 852 853 DEFINE_implication(sodium, print_code_stubs) 854 DEFINE_implication(sodium, print_code) 855 DEFINE_implication(sodium, print_opt_code) 856 DEFINE_implication(sodium, emit_opt_code_positions) 857 DEFINE_implication(sodium, code_comments) 858 859 DEFINE_bool(print_all_code, false, "enable all flags related to printing code") 860 DEFINE_implication(print_all_code, print_code) 861 DEFINE_implication(print_all_code, print_opt_code) 862 DEFINE_implication(print_all_code, print_unopt_code) 863 DEFINE_implication(print_all_code, print_code_verbose) 864 DEFINE_implication(print_all_code, print_builtin_code) 865 DEFINE_implication(print_all_code, print_code_stubs) 866 DEFINE_implication(print_all_code, code_comments) 867 #ifdef DEBUG 868 DEFINE_implication(print_all_code, trace_codegen) 869 #endif 870 #endif 871 872 // 873 // Read-only flags 874 // 875 #undef FLAG 876 #define FLAG FLAG_READONLY 877 878 // assembler-arm.h 879 DEFINE_bool(enable_ool_constant_pool, false, 880 "enable use of out-of-line constant pools (ARM only)") 881 882 // Cleanup... 883 #undef FLAG_FULL 884 #undef FLAG_READONLY 885 #undef FLAG 886 #undef FLAG_ALIAS 887 888 #undef DEFINE_bool 889 #undef DEFINE_maybe_bool 890 #undef DEFINE_int 891 #undef DEFINE_string 892 #undef DEFINE_float 893 #undef DEFINE_args 894 #undef DEFINE_implication 895 #undef DEFINE_ALIAS_bool 896 #undef DEFINE_ALIAS_int 897 #undef DEFINE_ALIAS_string 898 #undef DEFINE_ALIAS_float 899 #undef DEFINE_ALIAS_args 900 901 #undef FLAG_MODE_DECLARE 902 #undef FLAG_MODE_DEFINE 903 #undef FLAG_MODE_DEFINE_DEFAULTS 904 #undef FLAG_MODE_META 905 #undef FLAG_MODE_DEFINE_IMPLICATIONS 906 907 #undef COMMA 908
