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
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.
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.
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 ';'.
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:
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)
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)
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)
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)
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;
79 #error No mode supplied when including flags.defs
82 #ifdef FLAG_MODE_DECLARE
83 // Structure used to hold a collection of arguments to the JavaScript code.
84 #define JSARGUMENTS_INIT {{}}
87 inline int argc() const {
88 return static_cast<int>(storage_[0]);
90 inline const char** argv() const {
91 return reinterpret_cast<const char**>(storage_[1]);
93 inline const char*& operator[] (int idx) const {
96 inline JSArguments& operator=(JSArguments args) {
97 set_argc(args.argc());
98 set_argv(args.argv());
101 static JSArguments Create(int argc, const char** argv) {
108 void set_argc(int argc) {
111 void set_argv(const char** argv) {
112 storage_[1] = reinterpret_cast<AtomicWord>(argv);
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];
122 #define DEFINE_bool(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt)
123 #define DEFINE_int(nam, def, cmt) FLAG(INT, int, nam, def, cmt)
124 #define DEFINE_float(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt)
125 #define DEFINE_string(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt)
126 #define DEFINE_args(nam, def, cmt) FLAG(ARGS, JSArguments, nam, def, cmt)
129 // Flags in all modes.
131 #define FLAG FLAG_FULL
133 // Flags for language modes and experimental language features.
134 DEFINE_bool(use_strict, false, "enforce strict mode")
135 DEFINE_bool(es5_readonly, true,
136 "activate correct semantics for inheriting readonliness")
137 DEFINE_bool(es52_globals, true,
138 "activate new semantics for global var declarations")
140 DEFINE_bool(harmony_typeof, false, "enable harmony semantics for typeof")
141 DEFINE_bool(harmony_scoping, false, "enable harmony block scoping")
142 DEFINE_bool(harmony_modules, false,
143 "enable harmony modules (implies block scoping)")
144 DEFINE_bool(harmony_symbols, false,
145 "enable harmony symbols (a.k.a. private names)")
146 DEFINE_bool(harmony_proxies, false, "enable harmony proxies")
147 DEFINE_bool(harmony_collections, false,
148 "enable harmony collections (sets, maps, and weak maps)")
149 DEFINE_bool(harmony_observation, false,
150 "enable harmony object observation (implies harmony collections")
151 DEFINE_bool(harmony, false, "enable all harmony features (except typeof)")
152 DEFINE_implication(harmony, harmony_scoping)
153 DEFINE_implication(harmony, harmony_modules)
154 DEFINE_implication(harmony, harmony_symbols)
155 DEFINE_implication(harmony, harmony_proxies)
156 DEFINE_implication(harmony, harmony_collections)
157 DEFINE_implication(harmony, harmony_observation)
158 DEFINE_implication(harmony_modules, harmony_scoping)
159 DEFINE_implication(harmony_observation, harmony_collections)
161 // Flags for experimental implementation features.
162 DEFINE_bool(packed_arrays, true, "optimizes arrays that have no holes")
163 DEFINE_bool(smi_only_arrays, true, "tracks arrays with only smi values")
164 DEFINE_bool(compiled_transitions, false, "use optimizing compiler to "
165 "generate array elements transition stubs")
166 DEFINE_bool(clever_optimizations,
168 "Optimize object size, Array shift, DOM strings and string +")
169 DEFINE_bool(pretenure_literals, false, "allocate literals in old space")
171 // Flags for data representation optimizations
172 DEFINE_bool(unbox_double_arrays, true, "automatically unbox arrays of doubles")
173 DEFINE_bool(string_slices, true, "use string slices")
175 // Flags for Crankshaft.
176 DEFINE_bool(crankshaft, true, "use crankshaft")
177 DEFINE_string(hydrogen_filter, "", "optimization filter")
178 DEFINE_bool(use_range, true, "use hydrogen range analysis")
179 DEFINE_bool(eliminate_dead_phis, true, "eliminate dead phis")
180 DEFINE_bool(use_gvn, true, "use hydrogen global value numbering")
181 DEFINE_bool(use_canonicalizing, true, "use hydrogen instruction canonicalizing")
182 DEFINE_bool(use_inlining, true, "use function inlining")
183 DEFINE_int(max_inlined_source_size, 600,
184 "maximum source size in bytes considered for a single inlining")
185 DEFINE_int(max_inlined_nodes, 196,
186 "maximum number of AST nodes considered for a single inlining")
187 DEFINE_int(max_inlined_nodes_cumulative, 196,
188 "maximum cumulative number of AST nodes considered for inlining")
189 DEFINE_bool(loop_invariant_code_motion, true, "loop invariant code motion")
190 DEFINE_bool(fast_math, true, "faster (but maybe less accurate) math functions")
191 DEFINE_bool(collect_megamorphic_maps_from_stub_cache,
193 "crankshaft harvests type feedback from stub cache")
194 DEFINE_bool(hydrogen_stats, false, "print statistics for hydrogen")
195 DEFINE_bool(trace_hydrogen, false, "trace generated hydrogen to file")
196 DEFINE_string(trace_phase, "Z", "trace generated IR for specified phases")
197 DEFINE_bool(trace_inlining, false, "trace inlining decisions")
198 DEFINE_bool(trace_alloc, false, "trace register allocator")
199 DEFINE_bool(trace_all_uses, false, "trace all use positions")
200 DEFINE_bool(trace_range, false, "trace range analysis")
201 DEFINE_bool(trace_gvn, false, "trace global value numbering")
202 DEFINE_bool(trace_representation, false, "trace representation types")
203 DEFINE_bool(trace_track_allocation_sites, false,
204 "trace the tracking of allocation sites")
205 DEFINE_bool(stress_pointer_maps, false, "pointer map for every instruction")
206 DEFINE_bool(stress_environments, false, "environment for every instruction")
207 DEFINE_int(deopt_every_n_times,
209 "deoptimize every n times a deopt point is passed")
210 DEFINE_bool(trap_on_deopt, false, "put a break point before deoptimizing")
211 DEFINE_bool(deoptimize_uncommon_cases, true, "deoptimize uncommon cases")
212 DEFINE_bool(polymorphic_inlining, true, "polymorphic inlining")
213 DEFINE_bool(use_osr, true, "use on-stack replacement")
214 DEFINE_bool(idefs, false, "use informative definitions")
215 DEFINE_bool(array_bounds_checks_elimination, true,
216 "perform array bounds checks elimination")
217 DEFINE_bool(array_index_dehoisting, true,
218 "perform array index dehoisting")
219 DEFINE_bool(dead_code_elimination, true, "use dead code elimination")
220 DEFINE_bool(fold_constants, true, "use constant folding")
221 DEFINE_bool(trace_dead_code_elimination, false, "trace dead code elimination")
222 DEFINE_bool(unreachable_code_elimination, false,
223 "eliminate unreachable code (hidden behind soft deopts)")
224 DEFINE_bool(track_allocation_sites, true,
225 "Use allocation site info to reduce transitions")
226 DEFINE_bool(optimize_constructed_arrays, false,
227 "Use allocation site info on constructed arrays")
228 DEFINE_bool(trace_osr, false, "trace on-stack replacement")
229 DEFINE_int(stress_runs, 0, "number of stress runs")
230 DEFINE_bool(optimize_closures, true, "optimize closures")
231 DEFINE_bool(lookup_sample_by_shared, true,
232 "when picking a function to optimize, watch for shared function "
233 "info, not JSFunction itself")
234 DEFINE_bool(cache_optimized_code, true,
235 "cache optimized code for closures")
236 DEFINE_bool(inline_construct, true, "inline constructor calls")
237 DEFINE_bool(inline_arguments, true, "inline functions with arguments object")
238 DEFINE_bool(inline_accessors, true, "inline JavaScript accessors")
239 DEFINE_int(loop_weight, 1, "loop weight for representation inference")
241 DEFINE_bool(optimize_for_in, true,
242 "optimize functions containing for-in loops")
243 DEFINE_bool(opt_safe_uint32_operations, true,
244 "allow uint32 values on optimize frames if they are used only in "
247 DEFINE_bool(parallel_recompilation, false,
248 "optimizing hot functions asynchronously on a separate thread")
249 DEFINE_bool(trace_parallel_recompilation, false, "track parallel recompilation")
250 DEFINE_int(parallel_recompilation_queue_length, 3,
251 "the length of the parallel compilation queue")
252 DEFINE_int(parallel_recompilation_delay, 0,
253 "artificial compilation delay in ms")
254 DEFINE_bool(omit_prototype_checks_for_leaf_maps, true,
255 "do not emit prototype checks if all prototypes have leaf maps, "
256 "deoptimize the optimized code if the layout of the maps changes.")
258 // Experimental profiler changes.
259 DEFINE_bool(experimental_profiler, true, "enable all profiler experiments")
260 DEFINE_bool(watch_ic_patching, false, "profiler considers IC stability")
261 DEFINE_int(frame_count, 1, "number of stack frames inspected by the profiler")
262 DEFINE_bool(self_optimization, false,
263 "primitive functions trigger their own optimization")
264 DEFINE_bool(direct_self_opt, false,
265 "call recompile stub directly when self-optimizing")
266 DEFINE_bool(retry_self_opt, false, "re-try self-optimization if it failed")
267 DEFINE_bool(interrupt_at_exit, false,
268 "insert an interrupt check at function exit")
269 DEFINE_bool(weighted_back_edges, false,
270 "weight back edges by jump distance for interrupt triggering")
271 // 0x1700 fits in the immediate field of an ARM instruction.
272 DEFINE_int(interrupt_budget, 0x1700,
273 "execution budget before interrupt is triggered")
274 DEFINE_int(type_info_threshold, 15,
275 "percentage of ICs that must have type info to allow optimization")
276 DEFINE_int(self_opt_count, 130, "call count before self-optimization")
278 DEFINE_implication(experimental_profiler, watch_ic_patching)
279 DEFINE_implication(experimental_profiler, self_optimization)
280 // Not implying direct_self_opt here because it seems to be a bad idea.
281 DEFINE_implication(experimental_profiler, retry_self_opt)
282 DEFINE_implication(experimental_profiler, interrupt_at_exit)
283 DEFINE_implication(experimental_profiler, weighted_back_edges)
285 DEFINE_bool(trace_opt_verbose, false, "extra verbose compilation tracing")
286 DEFINE_implication(trace_opt_verbose, trace_opt)
288 // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc
289 DEFINE_bool(debug_code, false,
290 "generate extra code (assertions) for debugging")
291 DEFINE_bool(code_comments, false, "emit comments in code disassembly")
292 DEFINE_bool(enable_sse2, true,
293 "enable use of SSE2 instructions if available")
294 DEFINE_bool(enable_sse3, true,
295 "enable use of SSE3 instructions if available")
296 DEFINE_bool(enable_sse4_1, true,
297 "enable use of SSE4.1 instructions if available")
298 DEFINE_bool(enable_cmov, true,
299 "enable use of CMOV instruction if available")
300 DEFINE_bool(enable_rdtsc, true,
301 "enable use of RDTSC instruction if available")
302 DEFINE_bool(enable_sahf, true,
303 "enable use of SAHF instruction if available (X64 only)")
304 DEFINE_bool(enable_vfp3, true,
305 "enable use of VFP3 instructions if available - this implies "
306 "enabling ARMv7 and VFP2 instructions (ARM only)")
307 DEFINE_bool(enable_vfp2, true,
308 "enable use of VFP2 instructions if available")
309 DEFINE_bool(enable_armv7, true,
310 "enable use of ARMv7 instructions if available (ARM only)")
311 DEFINE_bool(enable_sudiv, true,
312 "enable use of SDIV and UDIV instructions if available (ARM only)")
313 DEFINE_bool(enable_movw_movt, false,
314 "enable loading 32-bit constant by means of movw/movt "
315 "instruction pairs (ARM only)")
316 DEFINE_bool(enable_unaligned_accesses, true,
317 "enable unaligned accesses for ARMv7 (ARM only)")
318 DEFINE_bool(enable_32dregs, true,
319 "enable use of d16-d31 registers on ARM - this requires VFP3")
320 DEFINE_bool(enable_fpu, true,
321 "enable use of MIPS FPU instructions if available (MIPS only)")
322 DEFINE_bool(enable_vldr_imm, false,
323 "enable use of constant pools for double immediate (ARM only)")
326 DEFINE_string(expose_natives_as, NULL, "expose natives in global object")
327 DEFINE_string(expose_debug_as, NULL, "expose debug in global object")
328 DEFINE_bool(expose_gc, false, "expose gc extension")
329 DEFINE_bool(expose_externalize_string, false,
330 "expose externalize string extension")
331 DEFINE_int(stack_trace_limit, 10, "number of stack frames to capture")
332 DEFINE_bool(builtins_in_stack_traces, false,
333 "show built-in functions in stack traces")
334 DEFINE_bool(disable_native_files, false, "disable builtin natives files")
337 DEFINE_bool(inline_new, true, "use fast inline allocation")
340 DEFINE_bool(stack_trace_on_abort, true,
341 "print a stack trace if an assertion failure occurs")
343 // codegen-ia32.cc / codegen-arm.cc
344 DEFINE_bool(trace, false, "trace function calls")
345 DEFINE_bool(mask_constants_with_cookie,
347 "use random jit cookie to mask large constants")
350 DEFINE_bool(lazy, true, "use lazy compilation")
351 DEFINE_bool(trace_opt, false, "trace lazy optimization")
352 DEFINE_bool(trace_opt_stats, false, "trace lazy optimization statistics")
353 DEFINE_bool(opt, true, "use adaptive optimizations")
354 DEFINE_bool(always_opt, false, "always try to optimize functions")
355 DEFINE_bool(prepare_always_opt, false, "prepare for turning on always opt")
356 DEFINE_bool(trace_deopt, false, "trace optimize function deoptimization")
357 DEFINE_bool(trace_stub_failures, false,
358 "trace deoptimization of generated code stubs")
361 DEFINE_int(min_preparse_length, 1024,
362 "minimum length for automatic enable preparsing")
363 DEFINE_bool(always_full_compiler, false,
364 "try to use the dedicated run-once backend for all code")
365 DEFINE_int(max_opt_count, 10,
366 "maximum number of optimization attempts before giving up.")
368 // compilation-cache.cc
369 DEFINE_bool(compilation_cache, true, "enable compilation cache")
371 DEFINE_bool(cache_prototype_transitions, true, "cache prototype transitions")
374 DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response")
375 DEFINE_bool(trace_js_array_abuse, false,
376 "trace out-of-bounds accesses to JS arrays")
377 DEFINE_bool(trace_external_array_abuse, false,
378 "trace out-of-bounds-accesses to external arrays")
379 DEFINE_bool(trace_array_abuse, false,
380 "trace out-of-bounds accesses to all arrays")
381 DEFINE_implication(trace_array_abuse, trace_js_array_abuse)
382 DEFINE_implication(trace_array_abuse, trace_external_array_abuse)
383 DEFINE_bool(debugger_auto_break, true,
384 "automatically set the debug break flag when debugger commands are "
386 DEFINE_bool(enable_liveedit, true, "enable liveedit experimental feature")
387 DEFINE_bool(break_on_abort, true, "always cause a debug break before aborting")
390 // Slightly less than 1MB on 64-bit, since Windows' default stack size for
391 // the main execution thread is 1MB for both 32 and 64-bit.
392 DEFINE_int(stack_size, kPointerSize * 123,
393 "default size of stack region v8 is allowed to use (in kBytes)")
396 DEFINE_int(max_stack_trace_source_length, 300,
397 "maximum length of function source code printed in a stack trace.")
400 DEFINE_bool(always_inline_smi_code, false,
401 "always inline smi code in non-opt code")
404 DEFINE_int(max_new_space_size, 0, "max size of the new generation (in kBytes)")
405 DEFINE_int(max_old_space_size, 0, "max size of the old generation (in Mbytes)")
406 DEFINE_int(max_executable_size, 0, "max size of executable memory (in Mbytes)")
407 DEFINE_bool(gc_global, false, "always perform global GCs")
408 DEFINE_int(gc_interval, -1, "garbage collect after <n> allocations")
409 DEFINE_bool(trace_gc, false,
410 "print one trace line following each garbage collection")
411 DEFINE_bool(trace_gc_nvp, false,
412 "print one detailed trace line in name=value format "
413 "after each garbage collection")
414 DEFINE_bool(trace_gc_ignore_scavenger, false,
415 "do not print trace line after scavenger collection")
416 DEFINE_bool(print_cumulative_gc_stat, false,
417 "print cumulative GC statistics in name=value format on exit")
418 DEFINE_bool(trace_gc_verbose, false,
419 "print more details following each garbage collection")
420 DEFINE_bool(trace_fragmentation, false,
421 "report fragmentation for old pointer and data pages")
422 DEFINE_bool(trace_external_memory, false,
423 "print amount of external allocated memory after each time "
425 DEFINE_bool(collect_maps, true,
426 "garbage collect maps from which no objects can be reached")
427 DEFINE_bool(weak_embedded_maps_in_optimized_code, true,
428 "make maps embedded in optimized code weak")
429 DEFINE_bool(flush_code, true,
430 "flush code that we expect not to use again (during full gc)")
431 DEFINE_bool(flush_code_incrementally, true,
432 "flush code that we expect not to use again (incrementally)")
433 DEFINE_bool(age_code, true,
434 "track un-executed functions to age code and flush only "
436 DEFINE_bool(incremental_marking, true, "use incremental marking")
437 DEFINE_bool(incremental_marking_steps, true, "do incremental marking steps")
438 DEFINE_bool(trace_incremental_marking, false,
439 "trace progress of the incremental marking")
440 DEFINE_bool(track_gc_object_stats, false,
441 "track object counts and memory usage")
442 DEFINE_bool(parallel_sweeping, true, "enable parallel sweeping")
443 DEFINE_bool(concurrent_sweeping, false, "enable concurrent sweeping")
444 DEFINE_int(sweeper_threads, 0,
445 "number of parallel and concurrent sweeping threads")
446 DEFINE_bool(parallel_marking, false, "enable parallel marking")
447 DEFINE_int(marking_threads, 0, "number of parallel marking threads")
449 DEFINE_bool(verify_heap, false, "verify heap pointers before and after GC")
453 DEFINE_bool(use_idle_notification, true,
454 "Use idle notification to reduce memory footprint.")
456 DEFINE_bool(use_ic, true, "use inline caching")
458 // macro-assembler-ia32.cc
459 DEFINE_bool(native_code_counters, false,
460 "generate extra code for manipulating stats counters")
463 DEFINE_bool(always_compact, false, "Perform compaction on every full GC")
464 DEFINE_bool(lazy_sweeping, true,
465 "Use lazy sweeping for old pointer and data spaces")
466 DEFINE_bool(never_compact, false,
467 "Never perform compaction on full GC - testing only")
468 DEFINE_bool(compact_code_space, true,
469 "Compact code space on full non-incremental collections")
470 DEFINE_bool(incremental_code_compaction, true,
471 "Compact code space on full incremental collections")
472 DEFINE_bool(cleanup_code_caches_at_gc, true,
473 "Flush inline caches prior to mark compact collection and "
474 "flush code caches in maps during mark compact cycle.")
475 DEFINE_bool(use_marking_progress_bar, true,
476 "Use a progress bar to scan large objects in increments when "
477 "incremental marking is active.")
478 DEFINE_int(random_seed, 0,
479 "Default seed for initializing random generator "
480 "(0, the default, means to use system random).")
483 DEFINE_bool(use_verbose_printer, true, "allows verbose printing")
486 DEFINE_bool(allow_natives_syntax, false, "allow natives syntax")
487 DEFINE_bool(trace_parse, false, "trace parsing and preparsing")
489 // simulator-arm.cc and simulator-mips.cc
490 DEFINE_bool(trace_sim, false, "Trace simulator execution")
491 DEFINE_bool(check_icache, false,
492 "Check icache flushes in ARM and MIPS simulator")
493 DEFINE_int(stop_sim_at, 0, "Simulator stop after x number of instructions")
494 DEFINE_int(sim_stack_alignment, 8,
495 "Stack alingment in bytes in simulator (4 or 8, 8 is default)")
498 DEFINE_bool(trace_exception, false,
499 "print stack trace when throwing exceptions")
500 DEFINE_bool(preallocate_message_memory, false,
501 "preallocate some memory to build stack traces.")
502 DEFINE_bool(randomize_hashes,
504 "randomize hashes to avoid predictable hash collisions "
505 "(with snapshots this option cannot override the baked-in seed)")
506 DEFINE_int(hash_seed,
508 "Fixed seed to use to hash property keys (0 means random)"
509 "(with snapshots this option cannot override the baked-in seed)")
512 DEFINE_bool(preemption, false,
513 "activate a 100ms timer that switches between V8 threads")
516 DEFINE_bool(regexp_optimization, true, "generate optimized regexp code")
518 // Testing flags test/cctest/test-{flags,api,serialization}.cc
519 DEFINE_bool(testing_bool_flag, true, "testing_bool_flag")
520 DEFINE_int(testing_int_flag, 13, "testing_int_flag")
521 DEFINE_float(testing_float_flag, 2.5, "float-flag")
522 DEFINE_string(testing_string_flag, "Hello, world!", "string-flag")
523 DEFINE_int(testing_prng_seed, 42, "Seed used for threading test randomness")
525 DEFINE_string(testing_serialization_file, "C:\\Windows\\Temp\\serdes",
526 "file in which to testing_serialize heap")
528 DEFINE_string(testing_serialization_file, "/tmp/serdes",
529 "file in which to serialize heap")
533 DEFINE_string(extra_code, NULL, "A filename with extra code to be included in"
534 " the snapshot (mksnapshot only)")
540 DEFINE_bool(help, false, "Print usage message, including flags, on console")
541 DEFINE_bool(dump_counters, false, "Dump counters on exit")
543 #ifdef ENABLE_DEBUGGER_SUPPORT
544 DEFINE_bool(debugger, false, "Enable JavaScript debugger")
545 DEFINE_bool(remote_debugger, false, "Connect JavaScript debugger to the "
546 "debugger agent in another process")
547 DEFINE_bool(debugger_agent, false, "Enable debugger agent")
548 DEFINE_int(debugger_port, 5858, "Port to use for remote debugging")
549 #endif // ENABLE_DEBUGGER_SUPPORT
551 DEFINE_string(map_counters, "", "Map counters to a file")
552 DEFINE_args(js_arguments, JSARGUMENTS_INIT,
553 "Pass all remaining arguments to the script. Alias for \"--\".")
556 DEFINE_bool(debug_compile_events, false, "Enable debugger compile events")
557 DEFINE_bool(debug_script_collected_events, false,
558 "Enable debugger script collected events")
560 DEFINE_bool(debug_compile_events, true, "Enable debugger compile events")
561 DEFINE_bool(debug_script_collected_events, true,
562 "Enable debugger script collected events")
567 // GDB JIT integration flags.
570 DEFINE_bool(gdbjit, false, "enable GDBJIT interface (disables compacting GC)")
571 DEFINE_bool(gdbjit_full, false, "enable GDBJIT interface for all code objects")
572 DEFINE_bool(gdbjit_dump, false, "dump elf objects with debug info to disk")
573 DEFINE_string(gdbjit_dump_filter, "",
574 "dump only objects containing this substring")
577 DEFINE_bool(force_marking_deque_overflows, false,
578 "force overflows of marking deque by reducing it's size "
581 DEFINE_bool(stress_compaction, false,
582 "stress the GC compactor to flush out bugs (implies "
583 "--force_marking_deque_overflows)")
590 #define FLAG FLAG_FULL
592 #define FLAG FLAG_READONLY
596 DEFINE_bool(enable_slow_asserts, false,
597 "enable asserts that are slow to execute")
599 // codegen-ia32.cc / codegen-arm.cc
600 DEFINE_bool(trace_codegen, false,
601 "print name of functions for which code is generated")
602 DEFINE_bool(print_source, false, "pretty print source code")
603 DEFINE_bool(print_builtin_source, false,
604 "pretty print source code for builtins")
605 DEFINE_bool(print_ast, false, "print source AST")
606 DEFINE_bool(print_builtin_ast, false, "print source AST for builtins")
607 DEFINE_string(stop_at, "", "function name where to insert a breakpoint")
610 DEFINE_bool(print_builtin_scopes, false, "print scopes for builtins")
611 DEFINE_bool(print_scopes, false, "print scopes")
614 DEFINE_bool(trace_contexts, false, "trace contexts operations")
617 DEFINE_bool(gc_greedy, false, "perform GC prior to some allocations")
618 DEFINE_bool(gc_verbose, false, "print stuff during garbage collection")
619 DEFINE_bool(heap_stats, false, "report heap statistics before and after GC")
620 DEFINE_bool(code_stats, false, "report code statistics after GC")
621 DEFINE_bool(verify_native_context_separation, false,
622 "verify that code holds on to at most one native context after GC")
623 DEFINE_bool(print_handles, false, "report handles after GC")
624 DEFINE_bool(print_global_handles, false, "report global handles after GC")
627 DEFINE_bool(trace_ic, false, "trace inline cache state transitions")
630 DEFINE_bool(print_interfaces, false, "print interfaces")
631 DEFINE_bool(print_interface_details, false, "print interface inference details")
632 DEFINE_int(print_interface_depth, 5, "depth for printing interfaces")
635 DEFINE_bool(trace_normalization,
637 "prints when objects are turned into dictionaries.")
640 DEFINE_bool(trace_lazy, false, "trace lazy compilation")
643 DEFINE_bool(collect_heap_spill_statistics, false,
644 "report heap spill statistics along with heap_stats "
645 "(requires heap_stats)")
647 DEFINE_bool(trace_isolates, false, "trace isolate state changes")
650 DEFINE_bool(log_state_changes, false, "Log state changes.")
653 DEFINE_bool(regexp_possessive_quantifier,
655 "enable possessive quantifier syntax for testing")
656 DEFINE_bool(trace_regexp_bytecodes, false, "trace regexp bytecode execution")
657 DEFINE_bool(trace_regexp_assembler,
659 "trace regexp macro assembler calls.")
662 // Logging and profiling flags
665 #define FLAG FLAG_FULL
668 DEFINE_bool(log, false,
669 "Minimal logging (no API, code, GC, suspect, or handles samples).")
670 DEFINE_bool(log_all, false, "Log all events to the log file.")
671 DEFINE_bool(log_runtime, false, "Activate runtime system %Log call.")
672 DEFINE_bool(log_api, false, "Log API events to the log file.")
673 DEFINE_bool(log_code, false,
674 "Log code events to the log file without profiling.")
675 DEFINE_bool(log_gc, false,
676 "Log heap samples on garbage collection for the hp2ps tool.")
677 DEFINE_bool(log_handles, false, "Log global handle events.")
678 DEFINE_bool(log_snapshot_positions, false,
679 "log positions of (de)serialized objects in the snapshot.")
680 DEFINE_bool(log_suspect, false, "Log suspect operations.")
681 DEFINE_bool(prof, false,
682 "Log statistical profiling information (implies --log-code).")
683 DEFINE_bool(prof_auto, true,
684 "Used with --prof, starts profiling automatically")
685 DEFINE_bool(prof_lazy, false,
686 "Used with --prof, only does sampling and logging"
687 " when profiler is active (implies --noprof_auto).")
688 DEFINE_bool(prof_browser_mode, true,
689 "Used with --prof, turns on browser-compatible mode for profiling.")
690 DEFINE_bool(log_regexp, false, "Log regular expression execution.")
691 DEFINE_string(logfile, "v8.log", "Specify the name of the log file.")
692 DEFINE_bool(ll_prof, false, "Enable low-level linux profiler.")
693 DEFINE_string(gc_fake_mmap, "/tmp/__v8_gc__",
694 "Specify the name of the file for fake gc mmap used in ll_prof")
695 DEFINE_bool(log_internal_timer_events, false, "Time internal events.")
696 DEFINE_bool(log_timer_events, false,
697 "Time events including external callbacks.")
698 DEFINE_implication(log_timer_events, log_internal_timer_events)
701 // Disassembler only flags
704 #ifdef ENABLE_DISASSEMBLER
705 #define FLAG FLAG_FULL
707 #define FLAG FLAG_READONLY
711 DEFINE_bool(trace_elements_transitions, false, "trace elements transitions")
714 DEFINE_bool(print_code_stubs, false, "print code stubs")
715 DEFINE_bool(test_secondary_stub_cache,
717 "test secondary stub cache by disabling the primary one")
719 DEFINE_bool(test_primary_stub_cache,
721 "test primary stub cache by disabling the secondary one")
723 // codegen-ia32.cc / codegen-arm.cc
724 DEFINE_bool(print_code, false, "print generated code")
725 DEFINE_bool(print_opt_code, false, "print optimized code")
726 DEFINE_bool(print_unopt_code, false, "print unoptimized code before "
727 "printing optimized code based on it")
728 DEFINE_bool(print_code_verbose, false, "print more information for code")
729 DEFINE_bool(print_builtin_code, false, "print generated code for builtins")
731 #ifdef ENABLE_DISASSEMBLER
732 DEFINE_bool(print_all_code, false, "enable all flags related to printing code")
733 DEFINE_implication(print_all_code, print_code)
734 DEFINE_implication(print_all_code, print_opt_code)
735 DEFINE_implication(print_all_code, print_unopt_code)
736 DEFINE_implication(print_all_code, print_code_verbose)
737 DEFINE_implication(print_all_code, print_builtin_code)
738 DEFINE_implication(print_all_code, print_code_stubs)
739 DEFINE_implication(print_all_code, code_comments)
741 DEFINE_implication(print_all_code, trace_codegen)
753 #undef DEFINE_implication
755 #undef FLAG_MODE_DECLARE
756 #undef FLAG_MODE_DEFINE
757 #undef FLAG_MODE_DEFINE_DEFAULTS
758 #undef FLAG_MODE_META
759 #undef FLAG_MODE_DEFINE_IMPLICATIONS