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 #define DEFINE_implication(whenflag, thenflag) 45 46 // We want to supply the actual storage and value for the flag variable in the 47 // .cc file. We only do this for writable flags. 48 #elif defined(FLAG_MODE_DEFINE) 49 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 50 ctype FLAG_##nam = def; 51 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) 52 #define DEFINE_implication(whenflag, thenflag) 53 54 // We need to define all of our default values so that the Flag structure can 55 // access them by pointer. These are just used internally inside of one .cc, 56 // for MODE_META, so there is no impact on the flags interface. 57 #elif defined(FLAG_MODE_DEFINE_DEFAULTS) 58 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 59 static ctype const FLAGDEFAULT_##nam = def; 60 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) 61 #define DEFINE_implication(whenflag, thenflag) 62 63 // We want to write entries into our meta data table, for internal parsing and 64 // printing / etc in the flag parser code. We only do this for writable flags. 65 #elif defined(FLAG_MODE_META) 66 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 67 { Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false }, 68 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) 69 #define DEFINE_implication(whenflag, thenflag) 70 71 // We produce the code to set flags when it is implied by another flag. 72 #elif defined(FLAG_MODE_DEFINE_IMPLICATIONS) 73 #define FLAG_FULL(ftype, ctype, nam, def, cmt) 74 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) 75 #define DEFINE_implication(whenflag, thenflag) \ 76 if (FLAG_##whenflag) FLAG_##thenflag = true; 77 78 #else 79 #error No mode supplied when including flags.defs 80 #endif 81 82 #ifdef FLAG_MODE_DECLARE 83 // Structure used to hold a collection of arguments to the JavaScript code. 84 #define JSARGUMENTS_INIT {{}} 85 struct JSArguments { 86 public: 87 inline int argc() const { 88 return static_cast<int>(storage_[0]); 89 } 90 inline const char** argv() const { 91 return reinterpret_cast<const char**>(storage_[1]); 92 } 93 inline const char*& operator[] (int idx) const { 94 return argv()[idx]; 95 } 96 inline JSArguments& operator=(JSArguments args) { 97 set_argc(args.argc()); 98 set_argv(args.argv()); 99 return *this; 100 } 101 static JSArguments Create(int argc, const char** argv) { 102 JSArguments args; 103 args.set_argc(argc); 104 args.set_argv(argv); 105 return args; 106 } 107 private: 108 void set_argc(int argc) { 109 storage_[0] = argc; 110 } 111 void set_argv(const char** argv) { 112 storage_[1] = reinterpret_cast<AtomicWord>(argv); 113 } 114 public: 115 // Contains argc and argv. Unfortunately we have to store these two fields 116 // into a single one to avoid making the initialization macro (which would be 117 // "{ 0, NULL }") contain a coma. 118 AtomicWord storage_[2]; 119 }; 120 #endif 121 122 #if (defined CAN_USE_VFP3_INSTRUCTIONS) || !(defined ARM_TEST) 123 # define ENABLE_VFP3_DEFAULT true 124 #else 125 # define ENABLE_VFP3_DEFAULT false 126 #endif 127 #if (defined CAN_USE_ARMV7_INSTRUCTIONS) || !(defined ARM_TEST) 128 # define ENABLE_ARMV7_DEFAULT true 129 #else 130 # define ENABLE_ARMV7_DEFAULT false 131 #endif 132 #if (defined CAN_USE_VFP32DREGS) || !(defined ARM_TEST) 133 # define ENABLE_32DREGS_DEFAULT true 134 #else 135 # define ENABLE_32DREGS_DEFAULT false 136 #endif 137 138 #define DEFINE_bool(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt) 139 #define DEFINE_int(nam, def, cmt) FLAG(INT, int, nam, def, cmt) 140 #define DEFINE_float(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt) 141 #define DEFINE_string(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt) 142 #define DEFINE_args(nam, def, cmt) FLAG(ARGS, JSArguments, nam, def, cmt) 143 144 // 145 // Flags in all modes. 146 // 147 #define FLAG FLAG_FULL 148 149 // Flags for language modes and experimental language features. 150 DEFINE_bool(use_strict, false, "enforce strict mode") 151 DEFINE_bool(es5_readonly, true, 152 "activate correct semantics for inheriting readonliness") 153 DEFINE_bool(es52_globals, true, 154 "activate new semantics for global var declarations") 155 156 DEFINE_bool(harmony_typeof, false, "enable harmony semantics for typeof") 157 DEFINE_bool(harmony_scoping, false, "enable harmony block scoping") 158 DEFINE_bool(harmony_modules, false, 159 "enable harmony modules (implies block scoping)") 160 DEFINE_bool(harmony_symbols, false, 161 "enable harmony symbols (a.k.a. private names)") 162 DEFINE_bool(harmony_proxies, false, "enable harmony proxies") 163 DEFINE_bool(harmony_collections, false, 164 "enable harmony collections (sets, maps, and weak maps)") 165 DEFINE_bool(harmony_observation, false, 166 "enable harmony object observation (implies harmony collections") 167 DEFINE_bool(harmony_typed_arrays, false, 168 "enable harmony typed arrays") 169 DEFINE_bool(harmony_array_buffer, false, 170 "enable harmony array buffer") 171 DEFINE_implication(harmony_typed_arrays, harmony_array_buffer) 172 DEFINE_bool(harmony_generators, false, "enable harmony generators") 173 DEFINE_bool(harmony_iteration, false, "enable harmony iteration (for-of)") 174 DEFINE_bool(harmony_numeric_literals, false, 175 "enable harmony numeric literals (0o77, 0b11)") 176 DEFINE_bool(harmony_strings, false, "enable harmony string") 177 DEFINE_bool(harmony_arrays, false, "enable harmony arrays") 178 DEFINE_bool(harmony, false, "enable all harmony features (except typeof)") 179 DEFINE_implication(harmony, harmony_scoping) 180 DEFINE_implication(harmony, harmony_modules) 181 DEFINE_implication(harmony, harmony_symbols) 182 DEFINE_implication(harmony, harmony_proxies) 183 DEFINE_implication(harmony, harmony_collections) 184 DEFINE_implication(harmony, harmony_observation) 185 DEFINE_implication(harmony, harmony_generators) 186 DEFINE_implication(harmony, harmony_iteration) 187 DEFINE_implication(harmony, harmony_numeric_literals) 188 DEFINE_implication(harmony, harmony_strings) 189 DEFINE_implication(harmony, harmony_arrays) 190 DEFINE_implication(harmony_modules, harmony_scoping) 191 DEFINE_implication(harmony_observation, harmony_collections) 192 // TODO[dslomov] add harmony => harmony_typed_arrays 193 194 // Flags for experimental implementation features. 195 DEFINE_bool(packed_arrays, true, "optimizes arrays that have no holes") 196 DEFINE_bool(smi_only_arrays, true, "tracks arrays with only smi values") 197 DEFINE_bool(compiled_keyed_stores, true, "use optimizing compiler to " 198 "generate keyed store stubs") 199 DEFINE_bool(clever_optimizations, 200 true, 201 "Optimize object size, Array shift, DOM strings and string +") 202 DEFINE_bool(pretenuring, true, "allocate objects in old space") 203 // TODO(hpayer): We will remove this flag as soon as we have pretenuring 204 // support for specific allocation sites. 205 DEFINE_bool(pretenuring_call_new, false, "pretenure call new") 206 DEFINE_bool(track_fields, true, "track fields with only smi values") 207 DEFINE_bool(track_double_fields, true, "track fields with double values") 208 DEFINE_bool(track_heap_object_fields, true, "track fields with heap values") 209 DEFINE_bool(track_computed_fields, true, "track computed boilerplate fields") 210 DEFINE_implication(track_double_fields, track_fields) 211 DEFINE_implication(track_heap_object_fields, track_fields) 212 DEFINE_implication(track_computed_fields, track_fields) 213 DEFINE_bool(smi_binop, true, "support smi representation in binary operations") 214 215 // Flags for data representation optimizations 216 DEFINE_bool(unbox_double_arrays, true, "automatically unbox arrays of doubles") 217 DEFINE_bool(string_slices, true, "use string slices") 218 219 // Flags for Crankshaft. 220 DEFINE_bool(crankshaft, true, "use crankshaft") 221 DEFINE_string(hydrogen_filter, "*", "optimization filter") 222 DEFINE_bool(use_range, true, "use hydrogen range analysis") 223 DEFINE_bool(use_gvn, true, "use hydrogen global value numbering") 224 DEFINE_bool(use_canonicalizing, true, "use hydrogen instruction canonicalizing") 225 DEFINE_bool(use_inlining, true, "use function inlining") 226 DEFINE_bool(use_escape_analysis, false, "use hydrogen escape analysis") 227 DEFINE_bool(use_allocation_folding, true, "use allocation folding") 228 DEFINE_int(max_inlining_levels, 5, "maximum number of inlining levels") 229 DEFINE_int(max_inlined_source_size, 600, 230 "maximum source size in bytes considered for a single inlining") 231 DEFINE_int(max_inlined_nodes, 196, 232 "maximum number of AST nodes considered for a single inlining") 233 DEFINE_int(max_inlined_nodes_cumulative, 400, 234 "maximum cumulative number of AST nodes considered for inlining") 235 DEFINE_bool(loop_invariant_code_motion, true, "loop invariant code motion") 236 DEFINE_bool(fast_math, true, "faster (but maybe less accurate) math functions") 237 DEFINE_bool(collect_megamorphic_maps_from_stub_cache, 238 true, 239 "crankshaft harvests type feedback from stub cache") 240 DEFINE_bool(hydrogen_stats, false, "print statistics for hydrogen") 241 DEFINE_bool(trace_hydrogen, false, "trace generated hydrogen to file") 242 DEFINE_bool(trace_hydrogen_stubs, false, "trace generated hydrogen for stubs") 243 DEFINE_string(trace_hydrogen_file, NULL, "trace hydrogen to given file name") 244 DEFINE_string(trace_phase, "HLZ", "trace generated IR for specified phases") 245 DEFINE_bool(trace_inlining, false, "trace inlining decisions") 246 DEFINE_bool(trace_alloc, false, "trace register allocator") 247 DEFINE_bool(trace_all_uses, false, "trace all use positions") 248 DEFINE_bool(trace_range, false, "trace range analysis") 249 DEFINE_bool(trace_gvn, false, "trace global value numbering") 250 DEFINE_bool(trace_representation, false, "trace representation types") 251 DEFINE_bool(trace_escape_analysis, false, "trace hydrogen escape analysis") 252 DEFINE_bool(trace_allocation_folding, false, "trace allocation folding") 253 DEFINE_bool(trace_track_allocation_sites, false, 254 "trace the tracking of allocation sites") 255 DEFINE_bool(trace_migration, false, "trace object migration") 256 DEFINE_bool(trace_generalization, false, "trace map generalization") 257 DEFINE_bool(stress_pointer_maps, false, "pointer map for every instruction") 258 DEFINE_bool(stress_environments, false, "environment for every instruction") 259 DEFINE_int(deopt_every_n_times, 260 0, 261 "deoptimize every n times a deopt point is passed") 262 DEFINE_int(deopt_every_n_garbage_collections, 263 0, 264 "deoptimize every n garbage collections") 265 DEFINE_bool(print_deopt_stress, false, "print number of possible deopt points") 266 DEFINE_bool(trap_on_deopt, false, "put a break point before deoptimizing") 267 DEFINE_bool(trap_on_stub_deopt, false, 268 "put a break point before deoptimizing a stub") 269 DEFINE_bool(deoptimize_uncommon_cases, true, "deoptimize uncommon cases") 270 DEFINE_bool(polymorphic_inlining, true, "polymorphic inlining") 271 DEFINE_bool(use_osr, true, "use on-stack replacement") 272 DEFINE_bool(array_bounds_checks_elimination, true, 273 "perform array bounds checks elimination") 274 DEFINE_bool(array_bounds_checks_hoisting, false, 275 "perform array bounds checks hoisting") 276 DEFINE_bool(array_index_dehoisting, true, 277 "perform array index dehoisting") 278 DEFINE_bool(analyze_environment_liveness, true, 279 "analyze liveness of environment slots and zap dead values") 280 DEFINE_bool(dead_code_elimination, true, "use dead code elimination") 281 DEFINE_bool(fold_constants, true, "use constant folding") 282 DEFINE_bool(trace_dead_code_elimination, false, "trace dead code elimination") 283 DEFINE_bool(unreachable_code_elimination, false, 284 "eliminate unreachable code (hidden behind soft deopts)") 285 DEFINE_bool(track_allocation_sites, true, 286 "Use allocation site info to reduce transitions") 287 DEFINE_bool(trace_osr, false, "trace on-stack replacement") 288 DEFINE_int(stress_runs, 0, "number of stress runs") 289 DEFINE_bool(optimize_closures, true, "optimize closures") 290 DEFINE_bool(lookup_sample_by_shared, true, 291 "when picking a function to optimize, watch for shared function " 292 "info, not JSFunction itself") 293 DEFINE_bool(cache_optimized_code, true, 294 "cache optimized code for closures") 295 DEFINE_bool(flush_optimized_code_cache, true, 296 "flushes the cache of optimized code for closures on every GC") 297 DEFINE_bool(inline_construct, true, "inline constructor calls") 298 DEFINE_bool(inline_arguments, true, "inline functions with arguments object") 299 DEFINE_bool(inline_accessors, true, "inline JavaScript accessors") 300 DEFINE_int(loop_weight, 1, "loop weight for representation inference") 301 302 DEFINE_bool(optimize_for_in, true, 303 "optimize functions containing for-in loops") 304 DEFINE_bool(opt_safe_uint32_operations, true, 305 "allow uint32 values on optimize frames if they are used only in " 306 "safe operations") 307 308 DEFINE_bool(parallel_recompilation, true, 309 "optimizing hot functions asynchronously on a separate thread") 310 DEFINE_bool(trace_parallel_recompilation, false, "track parallel recompilation") 311 DEFINE_int(parallel_recompilation_queue_length, 8, 312 "the length of the parallel compilation queue") 313 DEFINE_int(parallel_recompilation_delay, 0, 314 "artificial compilation delay in ms") 315 DEFINE_bool(omit_map_checks_for_leaf_maps, true, 316 "do not emit check maps for constant values that have a leaf map, " 317 "deoptimize the optimized code if the layout of the maps changes.") 318 319 // Experimental profiler changes. 320 DEFINE_bool(experimental_profiler, true, "enable all profiler experiments") 321 DEFINE_bool(watch_ic_patching, false, "profiler considers IC stability") 322 DEFINE_int(frame_count, 1, "number of stack frames inspected by the profiler") 323 DEFINE_bool(self_optimization, false, 324 "primitive functions trigger their own optimization") 325 DEFINE_bool(direct_self_opt, false, 326 "call recompile stub directly when self-optimizing") 327 DEFINE_bool(retry_self_opt, false, "re-try self-optimization if it failed") 328 DEFINE_bool(interrupt_at_exit, false, 329 "insert an interrupt check at function exit") 330 DEFINE_bool(weighted_back_edges, false, 331 "weight back edges by jump distance for interrupt triggering") 332 // 0x1700 fits in the immediate field of an ARM instruction. 333 DEFINE_int(interrupt_budget, 0x1700, 334 "execution budget before interrupt is triggered") 335 DEFINE_int(type_info_threshold, 25, 336 "percentage of ICs that must have type info to allow optimization") 337 DEFINE_int(self_opt_count, 130, "call count before self-optimization") 338 339 DEFINE_implication(experimental_profiler, watch_ic_patching) 340 DEFINE_implication(experimental_profiler, self_optimization) 341 // Not implying direct_self_opt here because it seems to be a bad idea. 342 DEFINE_implication(experimental_profiler, retry_self_opt) 343 DEFINE_implication(experimental_profiler, interrupt_at_exit) 344 DEFINE_implication(experimental_profiler, weighted_back_edges) 345 346 DEFINE_bool(trace_opt_verbose, false, "extra verbose compilation tracing") 347 DEFINE_implication(trace_opt_verbose, trace_opt) 348 349 // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc 350 DEFINE_bool(debug_code, false, 351 "generate extra code (assertions) for debugging") 352 DEFINE_bool(code_comments, false, "emit comments in code disassembly") 353 DEFINE_bool(enable_sse2, true, 354 "enable use of SSE2 instructions if available") 355 DEFINE_bool(enable_sse3, true, 356 "enable use of SSE3 instructions if available") 357 DEFINE_bool(enable_sse4_1, true, 358 "enable use of SSE4.1 instructions if available") 359 DEFINE_bool(enable_cmov, true, 360 "enable use of CMOV instruction if available") 361 DEFINE_bool(enable_rdtsc, true, 362 "enable use of RDTSC instruction if available") 363 DEFINE_bool(enable_sahf, true, 364 "enable use of SAHF instruction if available (X64 only)") 365 DEFINE_bool(enable_vfp3, ENABLE_VFP3_DEFAULT, 366 "enable use of VFP3 instructions if available") 367 DEFINE_bool(enable_armv7, ENABLE_ARMV7_DEFAULT, 368 "enable use of ARMv7 instructions if available (ARM only)") 369 DEFINE_bool(enable_neon, true, 370 "enable use of NEON instructions if available (ARM only)") 371 DEFINE_bool(enable_sudiv, true, 372 "enable use of SDIV and UDIV instructions if available (ARM only)") 373 DEFINE_bool(enable_movw_movt, false, 374 "enable loading 32-bit constant by means of movw/movt " 375 "instruction pairs (ARM only)") 376 DEFINE_bool(enable_unaligned_accesses, true, 377 "enable unaligned accesses for ARMv7 (ARM only)") 378 DEFINE_bool(enable_32dregs, ENABLE_32DREGS_DEFAULT, 379 "enable use of d16-d31 registers on ARM - this requires VFP3") 380 DEFINE_bool(enable_vldr_imm, false, 381 "enable use of constant pools for double immediate (ARM only)") 382 383 // bootstrapper.cc 384 DEFINE_bool(enable_i18n, true, "enable i18n extension") 385 DEFINE_string(expose_natives_as, NULL, "expose natives in global object") 386 DEFINE_string(expose_debug_as, NULL, "expose debug in global object") 387 DEFINE_bool(expose_gc, false, "expose gc extension") 388 DEFINE_string(expose_gc_as, 389 NULL, 390 "expose gc extension under the specified name") 391 DEFINE_implication(expose_gc_as, expose_gc) 392 DEFINE_bool(expose_externalize_string, false, 393 "expose externalize string extension") 394 DEFINE_int(stack_trace_limit, 10, "number of stack frames to capture") 395 DEFINE_bool(builtins_in_stack_traces, false, 396 "show built-in functions in stack traces") 397 DEFINE_bool(disable_native_files, false, "disable builtin natives files") 398 399 // builtins-ia32.cc 400 DEFINE_bool(inline_new, true, "use fast inline allocation") 401 402 // checks.cc 403 DEFINE_bool(stack_trace_on_abort, true, 404 "print a stack trace if an assertion failure occurs") 405 406 // codegen-ia32.cc / codegen-arm.cc 407 DEFINE_bool(trace_codegen, false, 408 "print name of functions for which code is generated") 409 DEFINE_bool(trace, false, "trace function calls") 410 DEFINE_bool(mask_constants_with_cookie, 411 true, 412 "use random jit cookie to mask large constants") 413 414 // codegen.cc 415 DEFINE_bool(lazy, true, "use lazy compilation") 416 DEFINE_bool(trace_opt, false, "trace lazy optimization") 417 DEFINE_bool(trace_opt_stats, false, "trace lazy optimization statistics") 418 DEFINE_bool(opt, true, "use adaptive optimizations") 419 DEFINE_bool(always_opt, false, "always try to optimize functions") 420 DEFINE_bool(always_osr, false, "always try to OSR functions") 421 DEFINE_bool(prepare_always_opt, false, "prepare for turning on always opt") 422 DEFINE_bool(trace_deopt, false, "trace optimize function deoptimization") 423 DEFINE_bool(trace_stub_failures, false, 424 "trace deoptimization of generated code stubs") 425 426 // compiler.cc 427 DEFINE_int(min_preparse_length, 1024, 428 "minimum length for automatic enable preparsing") 429 DEFINE_bool(always_full_compiler, false, 430 "try to use the dedicated run-once backend for all code") 431 DEFINE_int(max_opt_count, 10, 432 "maximum number of optimization attempts before giving up.") 433 434 // compilation-cache.cc 435 DEFINE_bool(compilation_cache, true, "enable compilation cache") 436 437 DEFINE_bool(cache_prototype_transitions, true, "cache prototype transitions") 438 439 // debug.cc 440 DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response") 441 DEFINE_bool(trace_js_array_abuse, false, 442 "trace out-of-bounds accesses to JS arrays") 443 DEFINE_bool(trace_external_array_abuse, false, 444 "trace out-of-bounds-accesses to external arrays") 445 DEFINE_bool(trace_array_abuse, false, 446 "trace out-of-bounds accesses to all arrays") 447 DEFINE_implication(trace_array_abuse, trace_js_array_abuse) 448 DEFINE_implication(trace_array_abuse, trace_external_array_abuse) 449 DEFINE_bool(debugger_auto_break, true, 450 "automatically set the debug break flag when debugger commands are " 451 "in the queue") 452 DEFINE_bool(enable_liveedit, true, "enable liveedit experimental feature") 453 DEFINE_bool(break_on_abort, true, "always cause a debug break before aborting") 454 455 // execution.cc 456 // Slightly less than 1MB on 64-bit, since Windows' default stack size for 457 // the main execution thread is 1MB for both 32 and 64-bit. 458 DEFINE_int(stack_size, kPointerSize * 123, 459 "default size of stack region v8 is allowed to use (in kBytes)") 460 461 // frames.cc 462 DEFINE_int(max_stack_trace_source_length, 300, 463 "maximum length of function source code printed in a stack trace.") 464 465 // full-codegen.cc 466 DEFINE_bool(always_inline_smi_code, false, 467 "always inline smi code in non-opt code") 468 469 // heap.cc 470 DEFINE_int(max_new_space_size, 0, "max size of the new generation (in kBytes)") 471 DEFINE_int(max_old_space_size, 0, "max size of the old generation (in Mbytes)") 472 DEFINE_int(max_executable_size, 0, "max size of executable memory (in Mbytes)") 473 DEFINE_bool(gc_global, false, "always perform global GCs") 474 DEFINE_int(gc_interval, -1, "garbage collect after <n> allocations") 475 DEFINE_bool(trace_gc, false, 476 "print one trace line following each garbage collection") 477 DEFINE_bool(trace_gc_nvp, false, 478 "print one detailed trace line in name=value format " 479 "after each garbage collection") 480 DEFINE_bool(trace_gc_ignore_scavenger, false, 481 "do not print trace line after scavenger collection") 482 DEFINE_bool(print_cumulative_gc_stat, false, 483 "print cumulative GC statistics in name=value format on exit") 484 DEFINE_bool(trace_gc_verbose, false, 485 "print more details following each garbage collection") 486 DEFINE_bool(trace_fragmentation, false, 487 "report fragmentation for old pointer and data pages") 488 DEFINE_bool(trace_external_memory, false, 489 "print amount of external allocated memory after each time " 490 "it is adjusted.") 491 DEFINE_bool(collect_maps, true, 492 "garbage collect maps from which no objects can be reached") 493 DEFINE_bool(weak_embedded_maps_in_optimized_code, true, 494 "make maps embedded in optimized code weak") 495 DEFINE_bool(flush_code, true, 496 "flush code that we expect not to use again (during full gc)") 497 DEFINE_bool(flush_code_incrementally, true, 498 "flush code that we expect not to use again (incrementally)") 499 DEFINE_bool(trace_code_flushing, false, "trace code flushing progress") 500 DEFINE_bool(age_code, true, 501 "track un-executed functions to age code and flush only " 502 "old code (required for code flushing)") 503 DEFINE_bool(incremental_marking, true, "use incremental marking") 504 DEFINE_bool(incremental_marking_steps, true, "do incremental marking steps") 505 DEFINE_bool(trace_incremental_marking, false, 506 "trace progress of the incremental marking") 507 DEFINE_bool(track_gc_object_stats, false, 508 "track object counts and memory usage") 509 DEFINE_bool(parallel_sweeping, true, "enable parallel sweeping") 510 DEFINE_bool(concurrent_sweeping, false, "enable concurrent sweeping") 511 DEFINE_int(sweeper_threads, 0, 512 "number of parallel and concurrent sweeping threads") 513 DEFINE_bool(parallel_marking, false, "enable parallel marking") 514 DEFINE_int(marking_threads, 0, "number of parallel marking threads") 515 #ifdef VERIFY_HEAP 516 DEFINE_bool(verify_heap, false, "verify heap pointers before and after GC") 517 #endif 518 519 // v8.cc 520 DEFINE_bool(use_idle_notification, true, 521 "Use idle notification to reduce memory footprint.") 522 // ic.cc 523 DEFINE_bool(use_ic, true, "use inline caching") 524 525 // macro-assembler-ia32.cc 526 DEFINE_bool(native_code_counters, false, 527 "generate extra code for manipulating stats counters") 528 529 // mark-compact.cc 530 DEFINE_bool(always_compact, false, "Perform compaction on every full GC") 531 DEFINE_bool(lazy_sweeping, true, 532 "Use lazy sweeping for old pointer and data spaces") 533 DEFINE_bool(never_compact, false, 534 "Never perform compaction on full GC - testing only") 535 DEFINE_bool(compact_code_space, true, 536 "Compact code space on full non-incremental collections") 537 DEFINE_bool(incremental_code_compaction, true, 538 "Compact code space on full incremental collections") 539 DEFINE_bool(cleanup_code_caches_at_gc, true, 540 "Flush inline caches prior to mark compact collection and " 541 "flush code caches in maps during mark compact cycle.") 542 DEFINE_bool(use_marking_progress_bar, true, 543 "Use a progress bar to scan large objects in increments when " 544 "incremental marking is active.") 545 DEFINE_int(random_seed, 0, 546 "Default seed for initializing random generator " 547 "(0, the default, means to use system random).") 548 549 // objects.cc 550 DEFINE_bool(use_verbose_printer, true, "allows verbose printing") 551 552 // parser.cc 553 DEFINE_bool(allow_natives_syntax, false, "allow natives syntax") 554 DEFINE_bool(trace_parse, false, "trace parsing and preparsing") 555 556 // simulator-arm.cc and simulator-mips.cc 557 DEFINE_bool(trace_sim, false, "Trace simulator execution") 558 DEFINE_bool(check_icache, false, 559 "Check icache flushes in ARM and MIPS simulator") 560 DEFINE_int(stop_sim_at, 0, "Simulator stop after x number of instructions") 561 DEFINE_int(sim_stack_alignment, 8, 562 "Stack alingment in bytes in simulator (4 or 8, 8 is default)") 563 564 // isolate.cc 565 DEFINE_bool(abort_on_uncaught_exception, false, 566 "abort program (dump core) when an uncaught exception is thrown") 567 DEFINE_bool(trace_exception, false, 568 "print stack trace when throwing exceptions") 569 DEFINE_bool(preallocate_message_memory, false, 570 "preallocate some memory to build stack traces.") 571 DEFINE_bool(randomize_hashes, 572 true, 573 "randomize hashes to avoid predictable hash collisions " 574 "(with snapshots this option cannot override the baked-in seed)") 575 DEFINE_int(hash_seed, 576 0, 577 "Fixed seed to use to hash property keys (0 means random)" 578 "(with snapshots this option cannot override the baked-in seed)") 579 580 // v8.cc 581 DEFINE_bool(preemption, false, 582 "activate a 100ms timer that switches between V8 threads") 583 584 // Regexp 585 DEFINE_bool(regexp_optimization, true, "generate optimized regexp code") 586 587 // Testing flags test/cctest/test-{flags,api,serialization}.cc 588 DEFINE_bool(testing_bool_flag, true, "testing_bool_flag") 589 DEFINE_int(testing_int_flag, 13, "testing_int_flag") 590 DEFINE_float(testing_float_flag, 2.5, "float-flag") 591 DEFINE_string(testing_string_flag, "Hello, world!", "string-flag") 592 DEFINE_int(testing_prng_seed, 42, "Seed used for threading test randomness") 593 #ifdef WIN32 594 DEFINE_string(testing_serialization_file, "C:\\Windows\\Temp\\serdes", 595 "file in which to testing_serialize heap") 596 #else 597 DEFINE_string(testing_serialization_file, "/tmp/serdes", 598 "file in which to serialize heap") 599 #endif 600 601 // mksnapshot.cc 602 DEFINE_string(extra_code, NULL, "A filename with extra code to be included in" 603 " the snapshot (mksnapshot only)") 604 605 // 606 // Dev shell flags 607 // 608 609 DEFINE_bool(help, false, "Print usage message, including flags, on console") 610 DEFINE_bool(dump_counters, false, "Dump counters on exit") 611 612 #ifdef ENABLE_DEBUGGER_SUPPORT 613 DEFINE_bool(debugger, false, "Enable JavaScript debugger") 614 DEFINE_bool(remote_debugger, false, "Connect JavaScript debugger to the " 615 "debugger agent in another process") 616 DEFINE_bool(debugger_agent, false, "Enable debugger agent") 617 DEFINE_int(debugger_port, 5858, "Port to use for remote debugging") 618 #endif // ENABLE_DEBUGGER_SUPPORT 619 620 DEFINE_string(map_counters, "", "Map counters to a file") 621 DEFINE_args(js_arguments, JSARGUMENTS_INIT, 622 "Pass all remaining arguments to the script. Alias for \"--\".") 623 624 #if defined(WEBOS__) 625 DEFINE_bool(debug_compile_events, false, "Enable debugger compile events") 626 DEFINE_bool(debug_script_collected_events, false, 627 "Enable debugger script collected events") 628 #else 629 DEFINE_bool(debug_compile_events, true, "Enable debugger compile events") 630 DEFINE_bool(debug_script_collected_events, true, 631 "Enable debugger script collected events") 632 #endif 633 634 635 // 636 // GDB JIT integration flags. 637 // 638 639 DEFINE_bool(gdbjit, false, "enable GDBJIT interface (disables compacting GC)") 640 DEFINE_bool(gdbjit_full, false, "enable GDBJIT interface for all code objects") 641 DEFINE_bool(gdbjit_dump, false, "dump elf objects with debug info to disk") 642 DEFINE_string(gdbjit_dump_filter, "", 643 "dump only objects containing this substring") 644 645 // mark-compact.cc 646 DEFINE_bool(force_marking_deque_overflows, false, 647 "force overflows of marking deque by reducing it's size " 648 "to 64 words") 649 650 DEFINE_bool(stress_compaction, false, 651 "stress the GC compactor to flush out bugs (implies " 652 "--force_marking_deque_overflows)") 653 654 // 655 // Debug only flags 656 // 657 #undef FLAG 658 #ifdef DEBUG 659 #define FLAG FLAG_FULL 660 #else 661 #define FLAG FLAG_READONLY 662 #endif 663 664 // checks.cc 665 DEFINE_bool(enable_slow_asserts, false, 666 "enable asserts that are slow to execute") 667 668 // codegen-ia32.cc / codegen-arm.cc 669 DEFINE_bool(print_source, false, "pretty print source code") 670 DEFINE_bool(print_builtin_source, false, 671 "pretty print source code for builtins") 672 DEFINE_bool(print_ast, false, "print source AST") 673 DEFINE_bool(print_builtin_ast, false, "print source AST for builtins") 674 DEFINE_string(stop_at, "", "function name where to insert a breakpoint") 675 676 // compiler.cc 677 DEFINE_bool(print_builtin_scopes, false, "print scopes for builtins") 678 DEFINE_bool(print_scopes, false, "print scopes") 679 680 // contexts.cc 681 DEFINE_bool(trace_contexts, false, "trace contexts operations") 682 683 // heap.cc 684 DEFINE_bool(gc_greedy, false, "perform GC prior to some allocations") 685 DEFINE_bool(gc_verbose, false, "print stuff during garbage collection") 686 DEFINE_bool(heap_stats, false, "report heap statistics before and after GC") 687 DEFINE_bool(code_stats, false, "report code statistics after GC") 688 DEFINE_bool(verify_native_context_separation, false, 689 "verify that code holds on to at most one native context after GC") 690 DEFINE_bool(print_handles, false, "report handles after GC") 691 DEFINE_bool(print_global_handles, false, "report global handles after GC") 692 693 // ic.cc 694 DEFINE_bool(trace_ic, false, "trace inline cache state transitions") 695 696 // interface.cc 697 DEFINE_bool(print_interfaces, false, "print interfaces") 698 DEFINE_bool(print_interface_details, false, "print interface inference details") 699 DEFINE_int(print_interface_depth, 5, "depth for printing interfaces") 700 701 // objects.cc 702 DEFINE_bool(trace_normalization, 703 false, 704 "prints when objects are turned into dictionaries.") 705 706 // runtime.cc 707 DEFINE_bool(trace_lazy, false, "trace lazy compilation") 708 709 // spaces.cc 710 DEFINE_bool(collect_heap_spill_statistics, false, 711 "report heap spill statistics along with heap_stats " 712 "(requires heap_stats)") 713 714 DEFINE_bool(trace_isolates, false, "trace isolate state changes") 715 716 // Regexp 717 DEFINE_bool(regexp_possessive_quantifier, 718 false, 719 "enable possessive quantifier syntax for testing") 720 DEFINE_bool(trace_regexp_bytecodes, false, "trace regexp bytecode execution") 721 DEFINE_bool(trace_regexp_assembler, 722 false, 723 "trace regexp macro assembler calls.") 724 725 // 726 // Logging and profiling flags 727 // 728 #undef FLAG 729 #define FLAG FLAG_FULL 730 731 // log.cc 732 DEFINE_bool(log, false, 733 "Minimal logging (no API, code, GC, suspect, or handles samples).") 734 DEFINE_bool(log_all, false, "Log all events to the log file.") 735 DEFINE_bool(log_runtime, false, "Activate runtime system %Log call.") 736 DEFINE_bool(log_api, false, "Log API events to the log file.") 737 DEFINE_bool(log_code, false, 738 "Log code events to the log file without profiling.") 739 DEFINE_bool(log_gc, false, 740 "Log heap samples on garbage collection for the hp2ps tool.") 741 DEFINE_bool(log_handles, false, "Log global handle events.") 742 DEFINE_bool(log_snapshot_positions, false, 743 "log positions of (de)serialized objects in the snapshot.") 744 DEFINE_bool(log_suspect, false, "Log suspect operations.") 745 DEFINE_bool(prof, false, 746 "Log statistical profiling information (implies --log-code).") 747 DEFINE_bool(prof_lazy, false, 748 "Used with --prof, only does sampling and logging" 749 " when profiler is active.") 750 DEFINE_bool(prof_browser_mode, true, 751 "Used with --prof, turns on browser-compatible mode for profiling.") 752 DEFINE_bool(log_regexp, false, "Log regular expression execution.") 753 DEFINE_string(logfile, "v8.log", "Specify the name of the log file.") 754 DEFINE_bool(ll_prof, false, "Enable low-level linux profiler.") 755 DEFINE_string(gc_fake_mmap, "/tmp/__v8_gc__", 756 "Specify the name of the file for fake gc mmap used in ll_prof") 757 DEFINE_bool(log_internal_timer_events, false, "Time internal events.") 758 DEFINE_bool(log_timer_events, false, 759 "Time events including external callbacks.") 760 DEFINE_implication(log_timer_events, log_internal_timer_events) 761 DEFINE_implication(log_internal_timer_events, prof) 762 763 // 764 // Disassembler only flags 765 // 766 #undef FLAG 767 #ifdef ENABLE_DISASSEMBLER 768 #define FLAG FLAG_FULL 769 #else 770 #define FLAG FLAG_READONLY 771 #endif 772 773 // elements.cc 774 DEFINE_bool(trace_elements_transitions, false, "trace elements transitions") 775 776 // code-stubs.cc 777 DEFINE_bool(print_code_stubs, false, "print code stubs") 778 DEFINE_bool(test_secondary_stub_cache, 779 false, 780 "test secondary stub cache by disabling the primary one") 781 782 DEFINE_bool(test_primary_stub_cache, 783 false, 784 "test primary stub cache by disabling the secondary one") 785 786 // codegen-ia32.cc / codegen-arm.cc 787 DEFINE_bool(print_code, false, "print generated code") 788 DEFINE_bool(print_opt_code, false, "print optimized code") 789 DEFINE_bool(print_unopt_code, false, "print unoptimized code before " 790 "printing optimized code based on it") 791 DEFINE_bool(print_code_verbose, false, "print more information for code") 792 DEFINE_bool(print_builtin_code, false, "print generated code for builtins") 793 794 #ifdef ENABLE_DISASSEMBLER 795 DEFINE_bool(print_all_code, false, "enable all flags related to printing code") 796 DEFINE_implication(print_all_code, print_code) 797 DEFINE_implication(print_all_code, print_opt_code) 798 DEFINE_implication(print_all_code, print_unopt_code) 799 DEFINE_implication(print_all_code, print_code_verbose) 800 DEFINE_implication(print_all_code, print_builtin_code) 801 DEFINE_implication(print_all_code, print_code_stubs) 802 DEFINE_implication(print_all_code, code_comments) 803 #ifdef DEBUG 804 DEFINE_implication(print_all_code, trace_codegen) 805 #endif 806 #endif 807 808 // Cleanup... 809 #undef FLAG_FULL 810 #undef FLAG_READONLY 811 #undef FLAG 812 813 #undef DEFINE_bool 814 #undef DEFINE_int 815 #undef DEFINE_string 816 #undef DEFINE_implication 817 818 #undef FLAG_MODE_DECLARE 819 #undef FLAG_MODE_DEFINE 820 #undef FLAG_MODE_DEFINE_DEFAULTS 821 #undef FLAG_MODE_META 822 #undef FLAG_MODE_DEFINE_IMPLICATIONS 823
