Line data Source code
1 : // Copyright 2012 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : // This file defines all of the flags. It is separated into different section,
6 : // for Debug, Release, Logging and Profiling, etc. To add a new flag, find the
7 : // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
8 : //
9 : // This include does not have a guard, because it is a template-style include,
10 : // which can be included multiple times in different modes. It expects to have
11 : // a mode defined before it's included. The modes are FLAG_MODE_... below:
12 : //
13 : // PRESUBMIT_INTENTIONALLY_MISSING_INCLUDE_GUARD
14 :
15 : #define DEFINE_IMPLICATION(whenflag, thenflag) \
16 : DEFINE_VALUE_IMPLICATION(whenflag, thenflag, true)
17 :
18 : #define DEFINE_NEG_IMPLICATION(whenflag, thenflag) \
19 : DEFINE_VALUE_IMPLICATION(whenflag, thenflag, false)
20 :
21 : #define DEFINE_NEG_NEG_IMPLICATION(whenflag, thenflag) \
22 : DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, false)
23 :
24 : // We want to declare the names of the variables for the header file. Normally
25 : // this will just be an extern declaration, but for a readonly flag we let the
26 : // compiler make better optimizations by giving it the value.
27 : #if defined(FLAG_MODE_DECLARE)
28 : #define FLAG_FULL(ftype, ctype, nam, def, cmt) \
29 : V8_EXPORT_PRIVATE extern ctype FLAG_##nam;
30 : #define FLAG_READONLY(ftype, ctype, nam, def, cmt) \
31 : static constexpr ctype FLAG_##nam = def;
32 :
33 : // We want to supply the actual storage and value for the flag variable in the
34 : // .cc file. We only do this for writable flags.
35 : #elif defined(FLAG_MODE_DEFINE)
36 : #ifdef USING_V8_SHARED
37 : #define FLAG_FULL(ftype, ctype, nam, def, cmt) \
38 : V8_EXPORT_PRIVATE extern ctype FLAG_##nam;
39 : #else
40 : #define FLAG_FULL(ftype, ctype, nam, def, cmt) \
41 : V8_EXPORT_PRIVATE ctype FLAG_##nam = def;
42 : #endif
43 :
44 : // We need to define all of our default values so that the Flag structure can
45 : // access them by pointer. These are just used internally inside of one .cc,
46 : // for MODE_META, so there is no impact on the flags interface.
47 : #elif defined(FLAG_MODE_DEFINE_DEFAULTS)
48 : #define FLAG_FULL(ftype, ctype, nam, def, cmt) \
49 : static constexpr ctype FLAGDEFAULT_##nam = def;
50 :
51 : // We want to write entries into our meta data table, for internal parsing and
52 : // printing / etc in the flag parser code. We only do this for writable flags.
53 : #elif defined(FLAG_MODE_META)
54 : #define FLAG_FULL(ftype, ctype, nam, def, cmt) \
55 : { Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false } \
56 : ,
57 : #define FLAG_ALIAS(ftype, ctype, alias, nam) \
58 : { \
59 : Flag::TYPE_##ftype, #alias, &FLAG_##nam, &FLAGDEFAULT_##nam, \
60 : "alias for --" #nam, false \
61 : } \
62 : ,
63 :
64 : // We produce the code to set flags when it is implied by another flag.
65 : #elif defined(FLAG_MODE_DEFINE_IMPLICATIONS)
66 : #define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value) \
67 : if (FLAG_##whenflag) FLAG_##thenflag = value;
68 :
69 : #define DEFINE_GENERIC_IMPLICATION(whenflag, statement) \
70 : if (FLAG_##whenflag) statement;
71 :
72 : #define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value) \
73 : if (!FLAG_##whenflag) FLAG_##thenflag = value;
74 :
75 : // We apply a generic macro to the flags.
76 : #elif defined(FLAG_MODE_APPLY)
77 :
78 : #define FLAG_FULL FLAG_MODE_APPLY
79 :
80 : #else
81 : #error No mode supplied when including flags.defs
82 : #endif
83 :
84 : // Dummy defines for modes where it is not relevant.
85 : #ifndef FLAG_FULL
86 : #define FLAG_FULL(ftype, ctype, nam, def, cmt)
87 : #endif
88 :
89 : #ifndef FLAG_READONLY
90 : #define FLAG_READONLY(ftype, ctype, nam, def, cmt)
91 : #endif
92 :
93 : #ifndef FLAG_ALIAS
94 : #define FLAG_ALIAS(ftype, ctype, alias, nam)
95 : #endif
96 :
97 : #ifndef DEFINE_VALUE_IMPLICATION
98 : #define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value)
99 : #endif
100 :
101 : #ifndef DEFINE_GENERIC_IMPLICATION
102 : #define DEFINE_GENERIC_IMPLICATION(whenflag, statement)
103 : #endif
104 :
105 : #ifndef DEFINE_NEG_VALUE_IMPLICATION
106 : #define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value)
107 : #endif
108 :
109 : #define COMMA ,
110 :
111 : #ifdef FLAG_MODE_DECLARE
112 :
113 : struct MaybeBoolFlag {
114 : static MaybeBoolFlag Create(bool has_value, bool value) {
115 : MaybeBoolFlag flag;
116 : flag.has_value = has_value;
117 25 : flag.value = value;
118 : return flag;
119 : }
120 : bool has_value;
121 : bool value;
122 :
123 : bool operator!=(const MaybeBoolFlag& other) const {
124 294 : return has_value != other.has_value || value != other.value;
125 : }
126 : };
127 : #endif
128 :
129 : #ifdef DEBUG
130 : #define DEBUG_BOOL true
131 : #else
132 : #define DEBUG_BOOL false
133 : #endif
134 :
135 : #ifdef V8_COMPRESS_POINTERS
136 : #define COMPRESS_POINTERS_BOOL true
137 : #else
138 : #define COMPRESS_POINTERS_BOOL false
139 : #endif
140 :
141 : // Supported ARM configurations are:
142 : // "armv6": ARMv6 + VFPv2
143 : // "armv7": ARMv7 + VFPv3-D32 + NEON
144 : // "armv7+sudiv": ARMv7 + VFPv4-D32 + NEON + SUDIV
145 : // "armv8": ARMv8 (including all of the above)
146 : #if !defined(ARM_TEST_NO_FEATURE_PROBE) || \
147 : (defined(CAN_USE_ARMV8_INSTRUCTIONS) && \
148 : defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_SUDIV) && \
149 : defined(CAN_USE_NEON) && defined(CAN_USE_VFP3_INSTRUCTIONS))
150 : #define ARM_ARCH_DEFAULT "armv8"
151 : #elif defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_SUDIV) && \
152 : defined(CAN_USE_NEON) && defined(CAN_USE_VFP3_INSTRUCTIONS)
153 : #define ARM_ARCH_DEFAULT "armv7+sudiv"
154 : #elif defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_NEON) && \
155 : defined(CAN_USE_VFP3_INSTRUCTIONS)
156 : #define ARM_ARCH_DEFAULT "armv7"
157 : #else
158 : #define ARM_ARCH_DEFAULT "armv6"
159 : #endif
160 :
161 : #ifdef V8_OS_WIN
162 : # define ENABLE_LOG_COLOUR false
163 : #else
164 : # define ENABLE_LOG_COLOUR true
165 : #endif
166 :
167 : #define DEFINE_BOOL(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt)
168 : #define DEFINE_BOOL_READONLY(nam, def, cmt) \
169 : FLAG_READONLY(BOOL, bool, nam, def, cmt)
170 : #define DEFINE_MAYBE_BOOL(nam, cmt) \
171 : FLAG(MAYBE_BOOL, MaybeBoolFlag, nam, {false COMMA false}, cmt)
172 : #define DEFINE_INT(nam, def, cmt) FLAG(INT, int, nam, def, cmt)
173 : #define DEFINE_UINT(nam, def, cmt) FLAG(UINT, unsigned int, nam, def, cmt)
174 : #define DEFINE_UINT64(nam, def, cmt) FLAG(UINT64, uint64_t, nam, def, cmt)
175 : #define DEFINE_FLOAT(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt)
176 : #define DEFINE_SIZE_T(nam, def, cmt) FLAG(SIZE_T, size_t, nam, def, cmt)
177 : #define DEFINE_STRING(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt)
178 : #define DEFINE_ALIAS_BOOL(alias, nam) FLAG_ALIAS(BOOL, bool, alias, nam)
179 : #define DEFINE_ALIAS_INT(alias, nam) FLAG_ALIAS(INT, int, alias, nam)
180 : #define DEFINE_ALIAS_FLOAT(alias, nam) FLAG_ALIAS(FLOAT, double, alias, nam)
181 : #define DEFINE_ALIAS_SIZE_T(alias, nam) FLAG_ALIAS(SIZE_T, size_t, alias, nam)
182 : #define DEFINE_ALIAS_STRING(alias, nam) \
183 : FLAG_ALIAS(STRING, const char*, alias, nam)
184 :
185 : #ifdef DEBUG
186 : #define DEFINE_DEBUG_BOOL DEFINE_BOOL
187 : #else
188 : #define DEFINE_DEBUG_BOOL DEFINE_BOOL_READONLY
189 : #endif
190 :
191 : //
192 : // Flags in all modes.
193 : //
194 : #define FLAG FLAG_FULL
195 :
196 : // Flags for language modes and experimental language features.
197 84 : DEFINE_BOOL(use_strict, false, "enforce strict mode")
198 :
199 84 : DEFINE_BOOL(es_staging, false,
200 : "enable test-worthy harmony features (for internal use only)")
201 84 : DEFINE_BOOL(harmony, false, "enable all completed harmony features")
202 84 : DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
203 171179 : DEFINE_IMPLICATION(es_staging, harmony)
204 : // Enabling import.meta requires to also enable import()
205 171179 : DEFINE_IMPLICATION(harmony_import_meta, harmony_dynamic_import)
206 :
207 171179 : DEFINE_IMPLICATION(harmony_class_fields, harmony_public_fields)
208 171179 : DEFINE_IMPLICATION(harmony_class_fields, harmony_static_fields)
209 171179 : DEFINE_IMPLICATION(harmony_class_fields, harmony_private_fields)
210 :
211 171179 : DEFINE_IMPLICATION(harmony_private_methods, harmony_private_fields)
212 :
213 : // Update bootstrapper.cc whenever adding a new feature flag.
214 :
215 : // Features that are still work in progress (behind individual flags).
216 : #define HARMONY_INPROGRESS_BASE(V) \
217 : V(harmony_class_fields, "harmony fields in class literals") \
218 : V(harmony_private_methods, "harmony private methods in class literals") \
219 : V(harmony_regexp_sequence, "RegExp Unicode sequence properties") \
220 : V(harmony_weak_refs, "harmony weak references") \
221 :
222 : #ifdef V8_INTL_SUPPORT
223 : #define HARMONY_INPROGRESS(V) \
224 : HARMONY_INPROGRESS_BASE(V) \
225 : V(harmony_intl_bigint, "BigInt.prototype.toLocaleString") \
226 : V(harmony_intl_datetime_style, "dateStyle timeStyle for DateTimeFormat")
227 : #else
228 : #define HARMONY_INPROGRESS(V) HARMONY_INPROGRESS_BASE(V)
229 : #endif
230 :
231 : // Features that are complete (but still behind --harmony/es-staging flag).
232 : #define HARMONY_STAGED_BASE(V) \
233 : V(harmony_numeric_separator, "harmony numeric separator between digits")
234 :
235 : #ifdef V8_INTL_SUPPORT
236 : #define HARMONY_STAGED(V) \
237 : HARMONY_STAGED_BASE(V) \
238 : V(harmony_intl_segmenter, "Intl.Segmenter")
239 : #else
240 : #define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)
241 : #endif
242 :
243 : // Features that are shipping (turned on by default, but internal flag remains).
244 : #define HARMONY_SHIPPING_BASE(V) \
245 : V(harmony_namespace_exports, \
246 : "harmony namespace exports (export * as foo from 'bar')") \
247 : V(harmony_sharedarraybuffer, "harmony sharedarraybuffer") \
248 : V(harmony_import_meta, "harmony import.meta property") \
249 : V(harmony_dynamic_import, "harmony dynamic import") \
250 : V(harmony_global, "harmony global") \
251 : V(harmony_json_stringify, "well-formed JSON.stringify") \
252 : V(harmony_public_fields, "harmony public instance fields in class literals") \
253 : V(harmony_static_fields, "harmony static fields in class literals") \
254 : V(harmony_string_matchall, "harmony String.prototype.matchAll") \
255 : V(harmony_object_from_entries, "harmony Object.fromEntries()") \
256 : V(harmony_await_optimization, "harmony await taking 1 tick") \
257 : V(harmony_private_fields, "harmony private fields in class literals") \
258 : V(harmony_hashbang, "harmony hashbang syntax")
259 :
260 : #ifdef V8_INTL_SUPPORT
261 : #define HARMONY_SHIPPING(V) \
262 : HARMONY_SHIPPING_BASE(V) \
263 : V(harmony_locale, "Intl.Locale")
264 : #else
265 : #define HARMONY_SHIPPING(V) HARMONY_SHIPPING_BASE(V)
266 : #endif
267 :
268 : // Once a shipping feature has proved stable in the wild, it will be dropped
269 : // from HARMONY_SHIPPING, all occurrences of the FLAG_ variable are removed,
270 : // and associated tests are moved from the harmony directory to the appropriate
271 : // esN directory.
272 :
273 :
274 : #define FLAG_INPROGRESS_FEATURES(id, description) \
275 : DEFINE_BOOL(id, false, "enable " #description " (in progress)")
276 84 : HARMONY_INPROGRESS(FLAG_INPROGRESS_FEATURES)
277 : #undef FLAG_INPROGRESS_FEATURES
278 :
279 : #define FLAG_STAGED_FEATURES(id, description) \
280 : DEFINE_BOOL(id, false, "enable " #description) \
281 : DEFINE_IMPLICATION(harmony, id)
282 171263 : HARMONY_STAGED(FLAG_STAGED_FEATURES)
283 : #undef FLAG_STAGED_FEATURES
284 :
285 : #define FLAG_SHIPPING_FEATURES(id, description) \
286 : DEFINE_BOOL(id, true, "enable " #description) \
287 : DEFINE_NEG_NEG_IMPLICATION(harmony_shipping, id)
288 171263 : HARMONY_SHIPPING(FLAG_SHIPPING_FEATURES)
289 : #undef FLAG_SHIPPING_FEATURES
290 :
291 : #ifdef V8_INTL_SUPPORT
292 84 : DEFINE_BOOL(icu_timezone_data, true, "get information about timezones from ICU")
293 : #endif
294 :
295 : #ifdef V8_ENABLE_RAW_HEAP_SNAPSHOTS
296 : #define V8_ENABLE_RAW_HEAP_SNAPSHOTS_BOOL true
297 : #else
298 : #define V8_ENABLE_RAW_HEAP_SNAPSHOTS_BOOL false
299 : #endif // V8_ENABLE_RAW_HEAP_SNAPSHOTS
300 :
301 : #ifdef V8_LITE_MODE
302 : #define V8_LITE_BOOL true
303 : #else
304 : #define V8_LITE_BOOL false
305 : #endif
306 :
307 : #ifdef V8_ENABLE_FUTURE
308 : #define FUTURE_BOOL true
309 : #else
310 : #define FUTURE_BOOL false
311 : #endif
312 84 : DEFINE_BOOL(future, FUTURE_BOOL,
313 : "Implies all staged features that we want to ship in the "
314 : "not-too-far future")
315 :
316 171179 : DEFINE_IMPLICATION(future, write_protect_code_memory)
317 :
318 : // Flags for experimental implementation features.
319 84 : DEFINE_BOOL(allocation_site_pretenuring, true,
320 : "pretenure with allocation sites")
321 84 : DEFINE_BOOL(page_promotion, true, "promote pages based on utilization")
322 84 : DEFINE_INT(page_promotion_threshold, 70,
323 : "min percentage of live bytes on a page to enable fast evacuation")
324 84 : DEFINE_BOOL(trace_pretenuring, false,
325 : "trace pretenuring decisions of HAllocate instructions")
326 84 : DEFINE_BOOL(trace_pretenuring_statistics, false,
327 : "trace allocation site pretenuring statistics")
328 84 : DEFINE_BOOL(track_fields, true, "track fields with only smi values")
329 84 : DEFINE_BOOL(track_double_fields, true, "track fields with double values")
330 84 : DEFINE_BOOL(track_heap_object_fields, true, "track fields with heap values")
331 84 : DEFINE_BOOL(track_computed_fields, true, "track computed boilerplate fields")
332 171179 : DEFINE_IMPLICATION(track_double_fields, track_fields)
333 171179 : DEFINE_IMPLICATION(track_heap_object_fields, track_fields)
334 171179 : DEFINE_IMPLICATION(track_computed_fields, track_fields)
335 84 : DEFINE_BOOL(track_field_types, true, "track field types")
336 171179 : DEFINE_IMPLICATION(track_field_types, track_fields)
337 171179 : DEFINE_IMPLICATION(track_field_types, track_heap_object_fields)
338 84 : DEFINE_BOOL(trace_block_coverage, false,
339 : "trace collected block coverage information")
340 84 : DEFINE_BOOL(feedback_normalization, false,
341 : "feed back normalization to constructors")
342 : // TODO(jkummerow): This currently adds too much load on the stub cache.
343 : DEFINE_BOOL_READONLY(internalize_on_the_fly, true,
344 : "internalize string keys for generic keyed ICs on the fly")
345 :
346 : // Flag to faster calls with arguments mismatches (https://crbug.com/v8/8895)
347 84 : DEFINE_BOOL(fast_calls_with_arguments_mismatches, true,
348 : "skip arguments adaptor frames when it's provably safe")
349 :
350 : // Flag for one shot optimiztions.
351 84 : DEFINE_BOOL(enable_one_shot_optimization, true,
352 : "Enable size optimizations for the code that will "
353 : "only be executed once")
354 :
355 :
356 : // Flags for data representation optimizations
357 84 : DEFINE_BOOL(unbox_double_arrays, true, "automatically unbox arrays of doubles")
358 : DEFINE_BOOL_READONLY(string_slices, true, "use string slices")
359 :
360 : // Flags for Ignition for no-snapshot builds.
361 : #undef FLAG
362 : #ifndef V8_USE_SNAPSHOT
363 : #define FLAG FLAG_FULL
364 : #else
365 : #define FLAG FLAG_READONLY
366 : #endif
367 : DEFINE_INT(interrupt_budget, 144 * KB,
368 : "interrupt budget which should be used for the profiler counter")
369 : #undef FLAG
370 : #define FLAG FLAG_FULL
371 :
372 : // Flags for Ignition.
373 84 : DEFINE_BOOL(ignition_elide_noneffectful_bytecodes, true,
374 : "elide bytecodes which won't have any external effect")
375 84 : DEFINE_BOOL(ignition_reo, true, "use ignition register equivalence optimizer")
376 84 : DEFINE_BOOL(ignition_filter_expression_positions, true,
377 : "filter expression positions before the bytecode pipeline")
378 84 : DEFINE_BOOL(ignition_share_named_property_feedback, true,
379 : "share feedback slots when loading the same named property from "
380 : "the same object")
381 84 : DEFINE_BOOL(print_bytecode, false,
382 : "print bytecode generated by ignition interpreter")
383 84 : DEFINE_BOOL(enable_lazy_source_positions, V8_LITE_BOOL,
384 : "skip generating source positions during initial compile but "
385 : "regenerate when actually required")
386 84 : DEFINE_STRING(print_bytecode_filter, "*",
387 : "filter for selecting which functions to print bytecode")
388 : #ifdef V8_TRACE_IGNITION
389 : DEFINE_BOOL(trace_ignition, false,
390 : "trace the bytecodes executed by the ignition interpreter")
391 : #endif
392 : #ifdef V8_TRACE_FEEDBACK_UPDATES
393 : DEFINE_BOOL(
394 : trace_feedback_updates, false,
395 : "trace updates to feedback vectors during ignition interpreter execution.")
396 : #endif
397 84 : DEFINE_BOOL(trace_ignition_codegen, false,
398 : "trace the codegen of ignition interpreter bytecode handlers")
399 84 : DEFINE_BOOL(trace_ignition_dispatches, false,
400 : "traces the dispatches to bytecode handlers by the ignition "
401 : "interpreter")
402 84 : DEFINE_STRING(trace_ignition_dispatches_output_file, nullptr,
403 : "the file to which the bytecode handler dispatch table is "
404 : "written (by default, the table is not written to a file)")
405 :
406 84 : DEFINE_BOOL(fast_math, true, "faster (but maybe less accurate) math functions")
407 84 : DEFINE_BOOL(trace_track_allocation_sites, false,
408 : "trace the tracking of allocation sites")
409 84 : DEFINE_BOOL(trace_migration, false, "trace object migration")
410 84 : DEFINE_BOOL(trace_generalization, false, "trace map generalization")
411 :
412 : // Flags for concurrent recompilation.
413 84 : DEFINE_BOOL(concurrent_recompilation, true,
414 : "optimizing hot functions asynchronously on a separate thread")
415 84 : DEFINE_BOOL(trace_concurrent_recompilation, false,
416 : "track concurrent recompilation")
417 84 : DEFINE_INT(concurrent_recompilation_queue_length, 8,
418 : "the length of the concurrent compilation queue")
419 84 : DEFINE_INT(concurrent_recompilation_delay, 0,
420 : "artificial compilation delay in ms")
421 84 : DEFINE_BOOL(block_concurrent_recompilation, false,
422 : "block queued jobs until released")
423 84 : DEFINE_BOOL(concurrent_inlining, false,
424 : "run optimizing compiler's inlining phase on a separate thread")
425 171179 : DEFINE_IMPLICATION(future, concurrent_inlining)
426 84 : DEFINE_BOOL(trace_heap_broker, false, "trace the heap broker")
427 :
428 : // Flags for stress-testing the compiler.
429 84 : DEFINE_INT(stress_runs, 0, "number of stress runs")
430 84 : DEFINE_INT(deopt_every_n_times, 0,
431 : "deoptimize every n times a deopt point is passed")
432 84 : DEFINE_BOOL(print_deopt_stress, false, "print number of possible deopt points")
433 :
434 : // Flags for TurboFan.
435 84 : DEFINE_BOOL(turbo_sp_frame_access, false,
436 : "use stack pointer-relative access to frame wherever possible")
437 84 : DEFINE_BOOL(turbo_preprocess_ranges, true,
438 : "run pre-register allocation heuristics")
439 84 : DEFINE_BOOL(turbo_control_flow_aware_allocation, false,
440 : "consider control flow while allocating registers")
441 171179 : DEFINE_NEG_IMPLICATION(turbo_control_flow_aware_allocation,
442 : turbo_preprocess_ranges)
443 :
444 84 : DEFINE_STRING(turbo_filter, "*", "optimization filter for TurboFan compiler")
445 84 : DEFINE_BOOL(trace_turbo, false, "trace generated TurboFan IR")
446 84 : DEFINE_STRING(trace_turbo_path, nullptr,
447 : "directory to dump generated TurboFan IR to")
448 84 : DEFINE_STRING(trace_turbo_filter, "*",
449 : "filter for tracing turbofan compilation")
450 84 : DEFINE_BOOL(trace_turbo_graph, false, "trace generated TurboFan graphs")
451 84 : DEFINE_BOOL(trace_turbo_scheduled, false, "trace TurboFan IR with schedule")
452 171179 : DEFINE_IMPLICATION(trace_turbo_scheduled, trace_turbo_graph)
453 84 : DEFINE_STRING(trace_turbo_cfg_file, nullptr,
454 : "trace turbo cfg graph (for C1 visualizer) to a given file name")
455 84 : DEFINE_BOOL(trace_turbo_types, true, "trace TurboFan's types")
456 84 : DEFINE_BOOL(trace_turbo_scheduler, false, "trace TurboFan's scheduler")
457 84 : DEFINE_BOOL(trace_turbo_reduction, false, "trace TurboFan's various reducers")
458 84 : DEFINE_BOOL(trace_turbo_trimming, false, "trace TurboFan's graph trimmer")
459 84 : DEFINE_BOOL(trace_turbo_jt, false, "trace TurboFan's jump threading")
460 84 : DEFINE_BOOL(trace_turbo_ceq, false, "trace TurboFan's control equivalence")
461 84 : DEFINE_BOOL(trace_turbo_loop, false, "trace TurboFan's loop optimizations")
462 84 : DEFINE_BOOL(trace_alloc, false, "trace register allocator")
463 84 : DEFINE_BOOL(trace_all_uses, false, "trace all use positions")
464 84 : DEFINE_BOOL(trace_representation, false, "trace representation types")
465 84 : DEFINE_BOOL(turbo_verify, DEBUG_BOOL, "verify TurboFan graphs at each phase")
466 84 : DEFINE_STRING(turbo_verify_machine_graph, nullptr,
467 : "verify TurboFan machine graph before instruction selection")
468 : #ifdef ENABLE_VERIFY_CSA
469 : DEFINE_BOOL(verify_csa, DEBUG_BOOL,
470 : "verify TurboFan machine graph of code stubs")
471 : #else
472 : // Define the flag as read-only-false so that code still compiles even in the
473 : // non-ENABLE_VERIFY_CSA configuration.
474 : DEFINE_BOOL_READONLY(verify_csa, false,
475 : "verify TurboFan machine graph of code stubs")
476 : #endif
477 84 : DEFINE_BOOL(trace_verify_csa, false, "trace code stubs verification")
478 84 : DEFINE_STRING(csa_trap_on_node, nullptr,
479 : "trigger break point when a node with given id is created in "
480 : "given stub. The format is: StubName,NodeId")
481 : DEFINE_BOOL_READONLY(fixed_array_bounds_checks, true,
482 : "enable FixedArray bounds checks")
483 84 : DEFINE_BOOL(turbo_stats, false, "print TurboFan statistics")
484 84 : DEFINE_BOOL(turbo_stats_nvp, false,
485 : "print TurboFan statistics in machine-readable format")
486 84 : DEFINE_BOOL(turbo_stats_wasm, false,
487 : "print TurboFan statistics of wasm compilations")
488 84 : DEFINE_BOOL(turbo_splitting, true, "split nodes during scheduling in TurboFan")
489 84 : DEFINE_BOOL(function_context_specialization, false,
490 : "enable function context specialization in TurboFan")
491 84 : DEFINE_BOOL(turbo_inlining, true, "enable inlining in TurboFan")
492 84 : DEFINE_INT(max_inlined_bytecode_size, 500,
493 : "maximum size of bytecode for a single inlining")
494 84 : DEFINE_INT(max_inlined_bytecode_size_cumulative, 1000,
495 : "maximum cumulative size of bytecode considered for inlining")
496 84 : DEFINE_INT(max_inlined_bytecode_size_absolute, 5000,
497 : "maximum cumulative size of bytecode considered for inlining")
498 84 : DEFINE_FLOAT(reserve_inline_budget_scale_factor, 1.2,
499 : "maximum cumulative size of bytecode considered for inlining")
500 84 : DEFINE_INT(max_inlined_bytecode_size_small, 30,
501 : "maximum size of bytecode considered for small function inlining")
502 84 : DEFINE_FLOAT(min_inlining_frequency, 0.15, "minimum frequency for inlining")
503 84 : DEFINE_BOOL(polymorphic_inlining, true, "polymorphic inlining")
504 84 : DEFINE_BOOL(stress_inline, false,
505 : "set high thresholds for inlining to inline as much as possible")
506 171179 : DEFINE_VALUE_IMPLICATION(stress_inline, max_inlined_bytecode_size, 999999)
507 171179 : DEFINE_VALUE_IMPLICATION(stress_inline, max_inlined_bytecode_size_cumulative,
508 : 999999)
509 171179 : DEFINE_VALUE_IMPLICATION(stress_inline, max_inlined_bytecode_size_absolute,
510 : 999999)
511 171179 : DEFINE_VALUE_IMPLICATION(stress_inline, min_inlining_frequency, 0)
512 171179 : DEFINE_VALUE_IMPLICATION(stress_inline, polymorphic_inlining, true)
513 84 : DEFINE_BOOL(trace_turbo_inlining, false, "trace TurboFan inlining")
514 84 : DEFINE_BOOL(inline_accessors, true, "inline JavaScript accessors")
515 84 : DEFINE_BOOL(inline_into_try, true, "inline into try blocks")
516 84 : DEFINE_BOOL(turbo_inline_array_builtins, true,
517 : "inline array builtins in TurboFan code")
518 84 : DEFINE_BOOL(use_osr, true, "use on-stack replacement")
519 84 : DEFINE_BOOL(trace_osr, false, "trace on-stack replacement")
520 84 : DEFINE_BOOL(analyze_environment_liveness, true,
521 : "analyze liveness of environment slots and zap dead values")
522 84 : DEFINE_BOOL(trace_environment_liveness, false,
523 : "trace liveness of local variable slots")
524 84 : DEFINE_BOOL(turbo_load_elimination, true, "enable load elimination in TurboFan")
525 84 : DEFINE_BOOL(trace_turbo_load_elimination, false,
526 : "trace TurboFan load elimination")
527 84 : DEFINE_BOOL(turbo_profiling, false, "enable profiling in TurboFan")
528 84 : DEFINE_BOOL(turbo_verify_allocation, DEBUG_BOOL,
529 : "verify register allocation in TurboFan")
530 84 : DEFINE_BOOL(turbo_move_optimization, true, "optimize gap moves in TurboFan")
531 84 : DEFINE_BOOL(turbo_jt, true, "enable jump threading in TurboFan")
532 84 : DEFINE_BOOL(turbo_loop_peeling, true, "Turbofan loop peeling")
533 84 : DEFINE_BOOL(turbo_loop_variable, true, "Turbofan loop variable optimization")
534 84 : DEFINE_BOOL(turbo_loop_rotation, true, "Turbofan loop rotation")
535 84 : DEFINE_BOOL(turbo_cf_optimization, true, "optimize control flow in TurboFan")
536 84 : DEFINE_BOOL(turbo_escape, true, "enable escape analysis")
537 84 : DEFINE_BOOL(turbo_allocation_folding, true, "Turbofan allocation folding")
538 84 : DEFINE_BOOL(turbo_instruction_scheduling, false,
539 : "enable instruction scheduling in TurboFan")
540 84 : DEFINE_BOOL(turbo_stress_instruction_scheduling, false,
541 : "randomly schedule instructions to stress dependency tracking")
542 84 : DEFINE_BOOL(turbo_store_elimination, true,
543 : "enable store-store elimination in TurboFan")
544 84 : DEFINE_BOOL(trace_store_elimination, false, "trace store elimination")
545 84 : DEFINE_BOOL(turbo_rewrite_far_jumps, true,
546 : "rewrite far to near jumps (ia32,x64)")
547 84 : DEFINE_BOOL(experimental_inline_promise_constructor, true,
548 : "inline the Promise constructor in TurboFan")
549 84 : DEFINE_BOOL(
550 : stress_gc_during_compilation, false,
551 : "simulate GC/compiler thread race related to https://crbug.com/v8/8520")
552 :
553 : #ifdef DISABLE_UNTRUSTED_CODE_MITIGATIONS
554 : #define V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS false
555 : #else
556 : #define V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS true
557 : #endif
558 84 : DEFINE_BOOL(untrusted_code_mitigations, V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS,
559 : "Enable mitigations for executing untrusted code")
560 : #undef V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS
561 :
562 : // Flags for native WebAssembly.
563 84 : DEFINE_BOOL(expose_wasm, true, "expose wasm interface to JavaScript")
564 84 : DEFINE_BOOL(assume_asmjs_origin, false,
565 : "force wasm decoder to assume input is internal asm-wasm format")
566 84 : DEFINE_BOOL(wasm_disable_structured_cloning, false,
567 : "disable wasm structured cloning")
568 84 : DEFINE_INT(wasm_num_compilation_tasks, 10,
569 : "number of parallel compilation tasks for wasm")
570 : DEFINE_DEBUG_BOOL(trace_wasm_native_heap, false,
571 : "trace wasm native heap events")
572 84 : DEFINE_BOOL(wasm_write_protect_code_memory, false,
573 : "write protect code memory on the wasm native heap")
574 84 : DEFINE_BOOL(trace_wasm_serialization, false,
575 : "trace serialization/deserialization")
576 84 : DEFINE_BOOL(wasm_async_compilation, true,
577 : "enable actual asynchronous compilation for WebAssembly.compile")
578 84 : DEFINE_BOOL(wasm_test_streaming, false,
579 : "use streaming compilation instead of async compilation for tests")
580 84 : DEFINE_UINT(wasm_max_mem_pages, v8::internal::wasm::kV8MaxWasmMemoryPages,
581 : "maximum number of 64KiB memory pages of a wasm instance")
582 84 : DEFINE_UINT(wasm_max_table_size, v8::internal::wasm::kV8MaxWasmTableSize,
583 : "maximum table size of a wasm instance")
584 84 : DEFINE_UINT(wasm_max_code_space, v8::internal::kMaxWasmCodeMB,
585 : "maximum committed code space for wasm (in MB)")
586 : // Enable Liftoff by default on ia32 and x64. More architectures will follow
587 : // once they are implemented and sufficiently tested.
588 : #if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
589 84 : DEFINE_BOOL(
590 : wasm_tier_up, true,
591 : "enable wasm baseline compilation and tier up to the optimizing compiler")
592 : #else
593 : DEFINE_BOOL(
594 : wasm_tier_up, false,
595 : "enable wasm baseline compilation and tier up to the optimizing compiler")
596 : DEFINE_IMPLICATION(future, wasm_tier_up)
597 : #endif
598 171179 : DEFINE_IMPLICATION(wasm_tier_up, liftoff)
599 : DEFINE_DEBUG_BOOL(trace_wasm_decoder, false, "trace decoding of wasm code")
600 : DEFINE_DEBUG_BOOL(trace_wasm_decode_time, false,
601 : "trace decoding time of wasm code")
602 : DEFINE_DEBUG_BOOL(trace_wasm_compiler, false, "trace compiling of wasm code")
603 : DEFINE_DEBUG_BOOL(trace_wasm_interpreter, false,
604 : "trace interpretation of wasm code")
605 : DEFINE_DEBUG_BOOL(trace_wasm_streaming, false,
606 : "trace streaming compilation of wasm code")
607 84 : DEFINE_INT(trace_wasm_ast_start, 0,
608 : "start function for wasm AST trace (inclusive)")
609 84 : DEFINE_INT(trace_wasm_ast_end, 0, "end function for wasm AST trace (exclusive)")
610 84 : DEFINE_BOOL(liftoff, false,
611 : "enable Liftoff, the baseline compiler for WebAssembly")
612 : DEFINE_DEBUG_BOOL(trace_liftoff, false,
613 : "trace Liftoff, the baseline compiler for WebAssembly")
614 : DEFINE_DEBUG_BOOL(wasm_break_on_decoder_error, false,
615 : "debug break when wasm decoder encounters an error")
616 84 : DEFINE_BOOL(trace_wasm_memory, false,
617 : "print all memory updates performed in wasm code")
618 : // Fuzzers use {wasm_tier_mask_for_testing} together with {liftoff} and
619 : // {no_wasm_tier_up} to force some functions to be compiled with Turbofan.
620 84 : DEFINE_INT(wasm_tier_mask_for_testing, 0,
621 : "bitmask of functions to compile with TurboFan instead of Liftoff")
622 :
623 84 : DEFINE_BOOL(validate_asm, true, "validate asm.js modules before compiling")
624 84 : DEFINE_BOOL(suppress_asm_messages, false,
625 : "don't emit asm.js related messages (for golden file testing)")
626 84 : DEFINE_BOOL(trace_asm_time, false, "log asm.js timing info to the console")
627 84 : DEFINE_BOOL(trace_asm_scanner, false,
628 : "log tokens encountered by asm.js scanner")
629 84 : DEFINE_BOOL(trace_asm_parser, false, "verbose logging of asm.js parse failures")
630 84 : DEFINE_BOOL(stress_validate_asm, false, "try to validate everything as asm.js")
631 :
632 : DEFINE_DEBUG_BOOL(dump_wasm_module, false, "dump wasm module bytes")
633 84 : DEFINE_STRING(dump_wasm_module_path, nullptr,
634 : "directory to dump wasm modules to")
635 :
636 : // Declare command-line flags for WASM features. Warning: avoid using these
637 : // flags directly in the implementation. Instead accept wasm::WasmFeatures
638 : // for configurability.
639 : #include "src/wasm/wasm-feature-flags.h"
640 :
641 : #define SPACE
642 : #define DECL_WASM_FLAG(feat, desc, val) \
643 : DEFINE_BOOL(experimental_wasm_##feat, val, \
644 : "enable prototype " desc " for wasm")
645 84 : FOREACH_WASM_FEATURE_FLAG(DECL_WASM_FLAG, SPACE)
646 : #undef DECL_WASM_FLAG
647 : #undef SPACE
648 :
649 84 : DEFINE_BOOL(wasm_opt, false, "enable wasm optimization")
650 84 : DEFINE_BOOL(wasm_no_bounds_checks, false,
651 : "disable bounds checks (performance testing only)")
652 84 : DEFINE_BOOL(wasm_no_stack_checks, false,
653 : "disable stack checks (performance testing only)")
654 84 : DEFINE_BOOL(wasm_math_intrinsics, true,
655 : "intrinsify some Math imports into wasm")
656 :
657 84 : DEFINE_BOOL(wasm_shared_engine, true,
658 : "shares one wasm engine between all isolates within a process")
659 171179 : DEFINE_IMPLICATION(future, wasm_shared_engine)
660 84 : DEFINE_BOOL(wasm_shared_code, true,
661 : "shares code underlying a wasm module when it is transferred")
662 171179 : DEFINE_IMPLICATION(future, wasm_shared_code)
663 84 : DEFINE_BOOL(wasm_trap_handler, true,
664 : "use signal handlers to catch out of bounds memory access in wasm"
665 : " (currently Linux x86_64 only)")
666 84 : DEFINE_BOOL(wasm_trap_handler_fallback, false,
667 : "Use bounds checks if guarded memory is not available")
668 84 : DEFINE_BOOL(wasm_fuzzer_gen_test, false,
669 : "Generate a test case when running a wasm fuzzer")
670 171179 : DEFINE_IMPLICATION(wasm_fuzzer_gen_test, single_threaded)
671 84 : DEFINE_BOOL(print_wasm_code, false, "Print WebAssembly code")
672 84 : DEFINE_BOOL(print_wasm_stub_code, false, "Print WebAssembly stub code")
673 84 : DEFINE_BOOL(wasm_interpret_all, false,
674 : "Execute all wasm code in the wasm interpreter")
675 84 : DEFINE_BOOL(asm_wasm_lazy_compilation, false,
676 : "enable lazy compilation for asm-wasm modules")
677 171179 : DEFINE_IMPLICATION(validate_asm, asm_wasm_lazy_compilation)
678 84 : DEFINE_BOOL(wasm_lazy_compilation, false,
679 : "enable lazy compilation for all wasm modules")
680 : DEFINE_DEBUG_BOOL(trace_wasm_lazy_compilation, false,
681 : "trace lazy compilation of wasm functions")
682 : // wasm-interpret-all resets {asm-,}wasm-lazy-compilation.
683 171179 : DEFINE_NEG_IMPLICATION(wasm_interpret_all, asm_wasm_lazy_compilation)
684 171179 : DEFINE_NEG_IMPLICATION(wasm_interpret_all, wasm_lazy_compilation)
685 171179 : DEFINE_NEG_IMPLICATION(wasm_interpret_all, wasm_tier_up)
686 :
687 : // Profiler flags.
688 84 : DEFINE_INT(frame_count, 1, "number of stack frames inspected by the profiler")
689 84 : DEFINE_INT(type_info_threshold, 25,
690 : "percentage of ICs that must have type info to allow optimization")
691 :
692 84 : DEFINE_INT(stress_sampling_allocation_profiler, 0,
693 : "Enables sampling allocation profiler with X as a sample interval")
694 :
695 : // Garbage collections flags.
696 84 : DEFINE_SIZE_T(min_semi_space_size, 0,
697 : "min size of a semi-space (in MBytes), the new space consists of "
698 : "two semi-spaces")
699 84 : DEFINE_SIZE_T(max_semi_space_size, 0,
700 : "max size of a semi-space (in MBytes), the new space consists of "
701 : "two semi-spaces")
702 84 : DEFINE_INT(semi_space_growth_factor, 2, "factor by which to grow the new space")
703 84 : DEFINE_BOOL(experimental_new_space_growth_heuristic, false,
704 : "Grow the new space based on the percentage of survivors instead "
705 : "of their absolute value.")
706 84 : DEFINE_SIZE_T(max_old_space_size, 0, "max size of the old space (in Mbytes)")
707 84 : DEFINE_SIZE_T(initial_old_space_size, 0, "initial old space size (in Mbytes)")
708 84 : DEFINE_BOOL(gc_global, false, "always perform global GCs")
709 84 : DEFINE_INT(random_gc_interval, 0,
710 : "Collect garbage after random(0, X) allocations. It overrides "
711 : "gc_interval.")
712 84 : DEFINE_INT(gc_interval, -1, "garbage collect after <n> allocations")
713 84 : DEFINE_INT(retain_maps_for_n_gc, 2,
714 : "keeps maps alive for <n> old space garbage collections")
715 84 : DEFINE_BOOL(trace_gc, false,
716 : "print one trace line following each garbage collection")
717 84 : DEFINE_BOOL(trace_gc_nvp, false,
718 : "print one detailed trace line in name=value format "
719 : "after each garbage collection")
720 84 : DEFINE_BOOL(trace_gc_ignore_scavenger, false,
721 : "do not print trace line after scavenger collection")
722 84 : DEFINE_BOOL(trace_idle_notification, false,
723 : "print one trace line following each idle notification")
724 84 : DEFINE_BOOL(trace_idle_notification_verbose, false,
725 : "prints the heap state used by the idle notification")
726 84 : DEFINE_BOOL(trace_gc_verbose, false,
727 : "print more details following each garbage collection")
728 171179 : DEFINE_IMPLICATION(trace_gc_verbose, trace_gc)
729 :
730 84 : DEFINE_INT(trace_allocation_stack_interval, -1,
731 : "print stack trace after <n> free-list allocations")
732 84 : DEFINE_INT(trace_duplicate_threshold_kb, 0,
733 : "print duplicate objects in the heap if their size is more than "
734 : "given threshold")
735 84 : DEFINE_BOOL(trace_fragmentation, false, "report fragmentation for old space")
736 84 : DEFINE_BOOL(trace_fragmentation_verbose, false,
737 : "report fragmentation for old space (detailed)")
738 84 : DEFINE_BOOL(trace_evacuation, false, "report evacuation statistics")
739 84 : DEFINE_BOOL(trace_mutator_utilization, false,
740 : "print mutator utilization, allocation speed, gc speed")
741 84 : DEFINE_BOOL(incremental_marking, true, "use incremental marking")
742 84 : DEFINE_BOOL(incremental_marking_wrappers, true,
743 : "use incremental marking for marking wrappers")
744 84 : DEFINE_BOOL(trace_unmapper, false, "Trace the unmapping")
745 84 : DEFINE_BOOL(parallel_scavenge, true, "parallel scavenge")
746 84 : DEFINE_BOOL(trace_parallel_scavenge, false, "trace parallel scavenge")
747 84 : DEFINE_BOOL(write_protect_code_memory, true, "write protect code memory")
748 : #ifdef V8_CONCURRENT_MARKING
749 : #define V8_CONCURRENT_MARKING_BOOL true
750 : #else
751 : #define V8_CONCURRENT_MARKING_BOOL false
752 : #endif
753 84 : DEFINE_BOOL(concurrent_marking, V8_CONCURRENT_MARKING_BOOL,
754 : "use concurrent marking")
755 84 : DEFINE_BOOL(parallel_marking, true, "use parallel marking in atomic pause")
756 84 : DEFINE_INT(ephemeron_fixpoint_iterations, 10,
757 : "number of fixpoint iterations it takes to switch to linear "
758 : "ephemeron algorithm")
759 84 : DEFINE_BOOL(trace_concurrent_marking, false, "trace concurrent marking")
760 84 : DEFINE_BOOL(concurrent_store_buffer, true,
761 : "use concurrent store buffer processing")
762 84 : DEFINE_BOOL(concurrent_sweeping, true, "use concurrent sweeping")
763 84 : DEFINE_BOOL(parallel_compaction, true, "use parallel compaction")
764 84 : DEFINE_BOOL(parallel_pointer_update, true,
765 : "use parallel pointer update during compaction")
766 84 : DEFINE_BOOL(detect_ineffective_gcs_near_heap_limit, true,
767 : "trigger out-of-memory failure to avoid GC storm near heap limit")
768 84 : DEFINE_BOOL(trace_incremental_marking, false,
769 : "trace progress of the incremental marking")
770 84 : DEFINE_BOOL(trace_stress_marking, false, "trace stress marking progress")
771 84 : DEFINE_BOOL(trace_stress_scavenge, false, "trace stress scavenge progress")
772 84 : DEFINE_BOOL(track_gc_object_stats, false,
773 : "track object counts and memory usage")
774 84 : DEFINE_BOOL(trace_gc_object_stats, false,
775 : "trace object counts and memory usage")
776 84 : DEFINE_BOOL(trace_zone_stats, false, "trace zone memory usage")
777 84 : DEFINE_BOOL(track_retaining_path, false,
778 : "enable support for tracking retaining path")
779 84 : DEFINE_BOOL(concurrent_array_buffer_freeing, true,
780 : "free array buffer allocations on a background thread")
781 84 : DEFINE_INT(gc_stats, 0, "Used by tracing internally to enable gc statistics")
782 171179 : DEFINE_IMPLICATION(trace_gc_object_stats, track_gc_object_stats)
783 171179 : DEFINE_GENERIC_IMPLICATION(
784 : track_gc_object_stats,
785 : TracingFlags::gc_stats.store(
786 : v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE))
787 171179 : DEFINE_GENERIC_IMPLICATION(
788 : trace_gc_object_stats,
789 : TracingFlags::gc_stats.store(
790 : v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE))
791 171179 : DEFINE_NEG_IMPLICATION(trace_gc_object_stats, incremental_marking)
792 171179 : DEFINE_NEG_IMPLICATION(track_retaining_path, incremental_marking)
793 171179 : DEFINE_NEG_IMPLICATION(track_retaining_path, parallel_marking)
794 171179 : DEFINE_NEG_IMPLICATION(track_retaining_path, concurrent_marking)
795 84 : DEFINE_BOOL(track_detached_contexts, true,
796 : "track native contexts that are expected to be garbage collected")
797 84 : DEFINE_BOOL(trace_detached_contexts, false,
798 : "trace native contexts that are expected to be garbage collected")
799 171179 : DEFINE_IMPLICATION(trace_detached_contexts, track_detached_contexts)
800 : #ifdef VERIFY_HEAP
801 : DEFINE_BOOL(verify_heap, false, "verify heap pointers before and after GC")
802 : DEFINE_BOOL(verify_heap_skip_remembered_set, false,
803 : "disable remembered set verification")
804 : #endif
805 84 : DEFINE_BOOL(move_object_start, true, "enable moving of object starts")
806 84 : DEFINE_BOOL(memory_reducer, true, "use memory reducer")
807 84 : DEFINE_BOOL(memory_reducer_for_small_heaps, true,
808 : "use memory reducer for small heaps")
809 84 : DEFINE_INT(heap_growing_percent, 0,
810 : "specifies heap growing factor as (1 + heap_growing_percent/100)")
811 84 : DEFINE_INT(v8_os_page_size, 0, "override OS page size (in KBytes)")
812 84 : DEFINE_BOOL(always_compact, false, "Perform compaction on every full GC")
813 84 : DEFINE_BOOL(never_compact, false,
814 : "Never perform compaction on full GC - testing only")
815 84 : DEFINE_BOOL(compact_code_space, true, "Compact code space on full collections")
816 84 : DEFINE_BOOL(flush_bytecode, true,
817 : "flush of bytecode when it has not been executed recently")
818 84 : DEFINE_BOOL(stress_flush_bytecode, false, "stress bytecode flushing")
819 171179 : DEFINE_IMPLICATION(stress_flush_bytecode, flush_bytecode)
820 84 : DEFINE_BOOL(use_marking_progress_bar, true,
821 : "Use a progress bar to scan large objects in increments when "
822 : "incremental marking is active.")
823 84 : DEFINE_BOOL(force_marking_deque_overflows, false,
824 : "force overflows of marking deque by reducing it's size "
825 : "to 64 words")
826 84 : DEFINE_BOOL(stress_compaction, false,
827 : "stress the GC compactor to flush out bugs (implies "
828 : "--force_marking_deque_overflows)")
829 84 : DEFINE_BOOL(stress_compaction_random, false,
830 : "Stress GC compaction by selecting random percent of pages as "
831 : "evacuation candidates. It overrides stress_compaction.")
832 84 : DEFINE_BOOL(stress_incremental_marking, false,
833 : "force incremental marking for small heaps and run it more often")
834 :
835 84 : DEFINE_BOOL(fuzzer_gc_analysis, false,
836 : "prints number of allocations and enables analysis mode for gc "
837 : "fuzz testing, e.g. --stress-marking, --stress-scavenge")
838 84 : DEFINE_INT(stress_marking, 0,
839 : "force marking at random points between 0 and X (inclusive) percent "
840 : "of the regular marking start limit")
841 84 : DEFINE_INT(stress_scavenge, 0,
842 : "force scavenge at random points between 0 and X (inclusive) "
843 : "percent of the new space capacity")
844 171179 : DEFINE_IMPLICATION(fuzzer_gc_analysis, stress_marking)
845 171179 : DEFINE_IMPLICATION(fuzzer_gc_analysis, stress_scavenge)
846 :
847 84 : DEFINE_BOOL(disable_abortjs, false, "disables AbortJS runtime function")
848 :
849 84 : DEFINE_BOOL(manual_evacuation_candidates_selection, false,
850 : "Test mode only flag. It allows an unit test to select evacuation "
851 : "candidates pages (requires --stress_compaction).")
852 84 : DEFINE_BOOL(fast_promotion_new_space, false,
853 : "fast promote new space on high survival rates")
854 :
855 84 : DEFINE_BOOL(clear_free_memory, false, "initialize free memory with 0")
856 :
857 84 : DEFINE_BOOL(young_generation_large_objects, true,
858 : "allocates large objects by default in the young generation large "
859 : "object space")
860 :
861 84 : DEFINE_BOOL(idle_time_scavenge, true, "Perform scavenges in idle time.")
862 :
863 : // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc
864 84 : DEFINE_BOOL(debug_code, DEBUG_BOOL,
865 : "generate extra code (assertions) for debugging")
866 84 : DEFINE_BOOL(code_comments, false,
867 : "emit comments in code disassembly; for more readable source "
868 : "positions you should add --no-concurrent_recompilation")
869 84 : DEFINE_BOOL(enable_sse3, true, "enable use of SSE3 instructions if available")
870 84 : DEFINE_BOOL(enable_ssse3, true, "enable use of SSSE3 instructions if available")
871 84 : DEFINE_BOOL(enable_sse4_1, true,
872 : "enable use of SSE4.1 instructions if available")
873 84 : DEFINE_BOOL(enable_sahf, true,
874 : "enable use of SAHF instruction if available (X64 only)")
875 84 : DEFINE_BOOL(enable_avx, true, "enable use of AVX instructions if available")
876 84 : DEFINE_BOOL(enable_fma3, true, "enable use of FMA3 instructions if available")
877 84 : DEFINE_BOOL(enable_bmi1, true, "enable use of BMI1 instructions if available")
878 84 : DEFINE_BOOL(enable_bmi2, true, "enable use of BMI2 instructions if available")
879 84 : DEFINE_BOOL(enable_lzcnt, true, "enable use of LZCNT instruction if available")
880 84 : DEFINE_BOOL(enable_popcnt, true,
881 : "enable use of POPCNT instruction if available")
882 84 : DEFINE_STRING(arm_arch, ARM_ARCH_DEFAULT,
883 : "generate instructions for the selected ARM architecture if "
884 : "available: armv6, armv7, armv7+sudiv or armv8")
885 84 : DEFINE_BOOL(force_long_branches, false,
886 : "force all emitted branches to be in long mode (MIPS/PPC only)")
887 84 : DEFINE_STRING(mcpu, "auto", "enable optimization for specific cpu")
888 84 : DEFINE_BOOL(partial_constant_pool, true,
889 : "enable use of partial constant pools (X64 only)")
890 :
891 : // Controlling source positions for Torque/CSA code.
892 84 : DEFINE_BOOL(enable_source_at_csa_bind, false,
893 : "Include source information in the binary at CSA bind locations.")
894 :
895 : // Deprecated ARM flags (replaced by arm_arch).
896 84 : DEFINE_MAYBE_BOOL(enable_armv7, "deprecated (use --arm_arch instead)")
897 84 : DEFINE_MAYBE_BOOL(enable_vfp3, "deprecated (use --arm_arch instead)")
898 84 : DEFINE_MAYBE_BOOL(enable_32dregs, "deprecated (use --arm_arch instead)")
899 84 : DEFINE_MAYBE_BOOL(enable_neon, "deprecated (use --arm_arch instead)")
900 84 : DEFINE_MAYBE_BOOL(enable_sudiv, "deprecated (use --arm_arch instead)")
901 84 : DEFINE_MAYBE_BOOL(enable_armv8, "deprecated (use --arm_arch instead)")
902 :
903 : // regexp-macro-assembler-*.cc
904 84 : DEFINE_BOOL(enable_regexp_unaligned_accesses, true,
905 : "enable unaligned accesses for the regexp engine")
906 :
907 : // api.cc
908 84 : DEFINE_BOOL(script_streaming, true, "enable parsing on background")
909 84 : DEFINE_BOOL(disable_old_api_accessors, false,
910 : "Disable old-style API accessors whose setters trigger through the "
911 : "prototype chain")
912 :
913 : // bootstrapper.cc
914 84 : DEFINE_BOOL(expose_free_buffer, false, "expose freeBuffer extension")
915 84 : DEFINE_BOOL(expose_gc, false, "expose gc extension")
916 84 : DEFINE_STRING(expose_gc_as, nullptr,
917 : "expose gc extension under the specified name")
918 171179 : DEFINE_IMPLICATION(expose_gc_as, expose_gc)
919 84 : DEFINE_BOOL(expose_externalize_string, false,
920 : "expose externalize string extension")
921 84 : DEFINE_BOOL(expose_trigger_failure, false, "expose trigger-failure extension")
922 84 : DEFINE_INT(stack_trace_limit, 10, "number of stack frames to capture")
923 84 : DEFINE_BOOL(builtins_in_stack_traces, false,
924 : "show built-in functions in stack traces")
925 84 : DEFINE_BOOL(disallow_code_generation_from_strings, false,
926 : "disallow eval and friends")
927 84 : DEFINE_BOOL(expose_async_hooks, false, "expose async_hooks object")
928 :
929 : // builtins.cc
930 84 : DEFINE_BOOL(allow_unsafe_function_constructor, false,
931 : "allow invoking the function constructor without security checks")
932 84 : DEFINE_BOOL(force_slow_path, false, "always take the slow path for builtins")
933 84 : DEFINE_BOOL(test_small_max_function_context_stub_size, false,
934 : "enable testing the function context size overflow path "
935 : "by making the maximum size smaller")
936 :
937 : // builtins-ia32.cc
938 84 : DEFINE_BOOL(inline_new, true, "use fast inline allocation")
939 :
940 : // codegen-ia32.cc / codegen-arm.cc
941 84 : DEFINE_BOOL(trace, false, "trace function calls")
942 :
943 : // codegen.cc
944 84 : DEFINE_BOOL(lazy, true, "use lazy compilation")
945 84 : DEFINE_BOOL(max_lazy, false, "ignore eager compilation hints")
946 171179 : DEFINE_IMPLICATION(max_lazy, lazy)
947 84 : DEFINE_BOOL(trace_opt, false, "trace lazy optimization")
948 84 : DEFINE_BOOL(trace_opt_verbose, false, "extra verbose compilation tracing")
949 171179 : DEFINE_IMPLICATION(trace_opt_verbose, trace_opt)
950 84 : DEFINE_BOOL(trace_opt_stats, false, "trace lazy optimization statistics")
951 84 : DEFINE_BOOL(trace_deopt, false, "trace optimize function deoptimization")
952 84 : DEFINE_BOOL(trace_file_names, false,
953 : "include file names in trace-opt/trace-deopt output")
954 84 : DEFINE_BOOL(trace_interrupts, false, "trace interrupts when they are handled")
955 84 : DEFINE_BOOL(always_opt, false, "always try to optimize functions")
956 84 : DEFINE_BOOL(always_osr, false, "always try to OSR functions")
957 84 : DEFINE_BOOL(prepare_always_opt, false, "prepare for turning on always opt")
958 :
959 84 : DEFINE_BOOL(trace_serializer, false, "print code serializer trace")
960 : #ifdef DEBUG
961 : DEFINE_BOOL(external_reference_stats, false,
962 : "print statistics on external references used during serialization")
963 : #endif // DEBUG
964 :
965 : // compilation-cache.cc
966 84 : DEFINE_BOOL(compilation_cache, true, "enable compilation cache")
967 :
968 84 : DEFINE_BOOL(cache_prototype_transitions, true, "cache prototype transitions")
969 :
970 : // compiler-dispatcher.cc
971 84 : DEFINE_BOOL(parallel_compile_tasks, false, "enable parallel compile tasks")
972 84 : DEFINE_BOOL(compiler_dispatcher, false, "enable compiler dispatcher")
973 171179 : DEFINE_IMPLICATION(parallel_compile_tasks, compiler_dispatcher)
974 84 : DEFINE_BOOL(trace_compiler_dispatcher, false,
975 : "trace compiler dispatcher activity")
976 :
977 : // cpu-profiler.cc
978 84 : DEFINE_INT(cpu_profiler_sampling_interval, 1000,
979 : "CPU profiler sampling interval in microseconds")
980 :
981 : // Array abuse tracing
982 84 : DEFINE_BOOL(trace_js_array_abuse, false,
983 : "trace out-of-bounds accesses to JS arrays")
984 84 : DEFINE_BOOL(trace_external_array_abuse, false,
985 : "trace out-of-bounds-accesses to external arrays")
986 84 : DEFINE_BOOL(trace_array_abuse, false,
987 : "trace out-of-bounds accesses to all arrays")
988 171179 : DEFINE_IMPLICATION(trace_array_abuse, trace_js_array_abuse)
989 171179 : DEFINE_IMPLICATION(trace_array_abuse, trace_external_array_abuse)
990 :
991 : // debugger
992 84 : DEFINE_BOOL(
993 : trace_side_effect_free_debug_evaluate, false,
994 : "print debug messages for side-effect-free debug-evaluate for testing")
995 84 : DEFINE_BOOL(hard_abort, true, "abort by crashing")
996 :
997 : // inspector
998 84 : DEFINE_BOOL(expose_inspector_scripts, false,
999 : "expose injected-script-source.js for debugging")
1000 :
1001 : // execution.cc
1002 84 : DEFINE_INT(stack_size, V8_DEFAULT_STACK_SIZE_KB,
1003 : "default size of stack region v8 is allowed to use (in kBytes)")
1004 :
1005 : // frames.cc
1006 84 : DEFINE_INT(max_stack_trace_source_length, 300,
1007 : "maximum length of function source code printed in a stack trace.")
1008 :
1009 : // execution.cc, messages.cc
1010 84 : DEFINE_BOOL(clear_exceptions_on_js_entry, false,
1011 : "clear pending exceptions when entering JavaScript")
1012 :
1013 : // counters.cc
1014 84 : DEFINE_INT(histogram_interval, 600000,
1015 : "time interval in ms for aggregating memory histograms")
1016 :
1017 : // heap-snapshot-generator.cc
1018 84 : DEFINE_BOOL(heap_profiler_trace_objects, false,
1019 : "Dump heap object allocations/movements/size_updates")
1020 84 : DEFINE_BOOL(heap_profiler_use_embedder_graph, true,
1021 : "Use the new EmbedderGraph API to get embedder nodes")
1022 84 : DEFINE_INT(heap_snapshot_string_limit, 1024,
1023 : "truncate strings to this length in the heap snapshot")
1024 :
1025 : // sampling-heap-profiler.cc
1026 84 : DEFINE_BOOL(sampling_heap_profiler_suppress_randomness, false,
1027 : "Use constant sample intervals to eliminate test flakiness")
1028 :
1029 : // v8.cc
1030 84 : DEFINE_BOOL(use_idle_notification, true,
1031 : "Use idle notification to reduce memory footprint.")
1032 : // ic.cc
1033 84 : DEFINE_BOOL(trace_ic, false,
1034 : "trace inline cache state transitions for tools/ic-processor")
1035 171179 : DEFINE_IMPLICATION(trace_ic, log_code)
1036 171179 : DEFINE_GENERIC_IMPLICATION(
1037 : trace_ic, TracingFlags::ic_stats.store(
1038 : v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE))
1039 : DEFINE_BOOL_READONLY(track_constant_fields, true,
1040 : "enable constant field tracking")
1041 : DEFINE_BOOL_READONLY(modify_map_inplace, true, "enable in-place map updates")
1042 : DEFINE_BOOL_READONLY(fast_map_update, false,
1043 : "enable fast map update by caching the migration target")
1044 84 : DEFINE_INT(max_polymorphic_map_count, 4,
1045 : "maximum number of maps to track in POLYMORPHIC state")
1046 :
1047 : // macro-assembler-ia32.cc
1048 84 : DEFINE_BOOL(native_code_counters, false,
1049 : "generate extra code for manipulating stats counters")
1050 :
1051 : // objects.cc
1052 84 : DEFINE_BOOL(thin_strings, true, "Enable ThinString support")
1053 84 : DEFINE_BOOL(trace_prototype_users, false,
1054 : "Trace updates to prototype user tracking")
1055 84 : DEFINE_BOOL(use_verbose_printer, true, "allows verbose printing")
1056 84 : DEFINE_BOOL(trace_for_in_enumerate, false, "Trace for-in enumerate slow-paths")
1057 84 : DEFINE_BOOL(trace_maps, false, "trace map creation")
1058 84 : DEFINE_BOOL(trace_maps_details, true, "also log map details")
1059 171179 : DEFINE_IMPLICATION(trace_maps, log_code)
1060 :
1061 : // parser.cc
1062 84 : DEFINE_BOOL(allow_natives_syntax, false, "allow natives syntax")
1063 84 : DEFINE_BOOL(parse_only, false, "only parse the sources")
1064 :
1065 : // simulator-arm.cc, simulator-arm64.cc and simulator-mips.cc
1066 84 : DEFINE_BOOL(trace_sim, false, "Trace simulator execution")
1067 84 : DEFINE_BOOL(debug_sim, false, "Enable debugging the simulator")
1068 84 : DEFINE_BOOL(check_icache, false,
1069 : "Check icache flushes in ARM and MIPS simulator")
1070 84 : DEFINE_INT(stop_sim_at, 0, "Simulator stop after x number of instructions")
1071 : #if defined(V8_TARGET_ARCH_ARM64) || defined(V8_TARGET_ARCH_MIPS64) || \
1072 : defined(V8_TARGET_ARCH_PPC64)
1073 : DEFINE_INT(sim_stack_alignment, 16,
1074 : "Stack alignment in bytes in simulator. This must be a power of two "
1075 : "and it must be at least 16. 16 is default.")
1076 : #else
1077 84 : DEFINE_INT(sim_stack_alignment, 8,
1078 : "Stack alingment in bytes in simulator (4 or 8, 8 is default)")
1079 : #endif
1080 84 : DEFINE_INT(sim_stack_size, 2 * MB / KB,
1081 : "Stack size of the ARM64, MIPS64 and PPC64 simulator "
1082 : "in kBytes (default is 2 MB)")
1083 84 : DEFINE_BOOL(log_colour, ENABLE_LOG_COLOUR,
1084 : "When logging, try to use coloured output.")
1085 84 : DEFINE_BOOL(ignore_asm_unimplemented_break, false,
1086 : "Don't break for ASM_UNIMPLEMENTED_BREAK macros.")
1087 84 : DEFINE_BOOL(trace_sim_messages, false,
1088 : "Trace simulator debug messages. Implied by --trace-sim.")
1089 :
1090 : // isolate.cc
1091 84 : DEFINE_BOOL(async_stack_traces, true,
1092 : "include async stack traces in Error.stack")
1093 171179 : DEFINE_IMPLICATION(async_stack_traces, harmony_await_optimization)
1094 84 : DEFINE_BOOL(stack_trace_on_illegal, false,
1095 : "print stack trace when an illegal exception is thrown")
1096 84 : DEFINE_BOOL(abort_on_uncaught_exception, false,
1097 : "abort program (dump core) when an uncaught exception is thrown")
1098 : // TODO(jgruber,machenbach): Rename to --correctness-fuzzer-suppressions.
1099 84 : DEFINE_BOOL(abort_on_stack_or_string_length_overflow, false,
1100 : "Abort program when the stack overflows or a string exceeds "
1101 : "maximum length (as opposed to throwing RangeError). This is "
1102 : "useful for fuzzing where the spec behaviour would introduce "
1103 : "nondeterminism.")
1104 84 : DEFINE_BOOL(randomize_hashes, true,
1105 : "randomize hashes to avoid predictable hash collisions "
1106 : "(with snapshots this option cannot override the baked-in seed)")
1107 84 : DEFINE_BOOL(rehash_snapshot, true,
1108 : "rehash strings from the snapshot to override the baked-in seed")
1109 84 : DEFINE_UINT64(hash_seed, 0,
1110 : "Fixed seed to use to hash property keys (0 means random)"
1111 : "(with snapshots this option cannot override the baked-in seed)")
1112 84 : DEFINE_INT(random_seed, 0,
1113 : "Default seed for initializing random generator "
1114 : "(0, the default, means to use system random).")
1115 84 : DEFINE_INT(fuzzer_random_seed, 0,
1116 : "Default seed for initializing fuzzer random generator "
1117 : "(0, the default, means to use v8's random number generator seed).")
1118 84 : DEFINE_BOOL(trace_rail, false, "trace RAIL mode")
1119 84 : DEFINE_BOOL(print_all_exceptions, false,
1120 : "print exception object and stack trace on each thrown exception")
1121 84 : DEFINE_BOOL(
1122 : detailed_error_stack_trace, false,
1123 : "includes arguments for each function call in the error stack frames array")
1124 :
1125 : // runtime.cc
1126 84 : DEFINE_BOOL(runtime_call_stats, false, "report runtime call counts and times")
1127 171179 : DEFINE_GENERIC_IMPLICATION(
1128 : runtime_call_stats,
1129 : TracingFlags::runtime_stats.store(
1130 : v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE))
1131 :
1132 : // snapshot-common.cc
1133 : #ifdef V8_EMBEDDED_BUILTINS
1134 : #define V8_EMBEDDED_BUILTINS_BOOL true
1135 : #else
1136 : #define V8_EMBEDDED_BUILTINS_BOOL false
1137 : #endif
1138 : DEFINE_BOOL_READONLY(embedded_builtins, V8_EMBEDDED_BUILTINS_BOOL,
1139 : "Embed builtin code into the binary.")
1140 84 : DEFINE_BOOL(profile_deserialization, false,
1141 : "Print the time it takes to deserialize the snapshot.")
1142 84 : DEFINE_BOOL(serialization_statistics, false,
1143 : "Collect statistics on serialized objects.")
1144 84 : DEFINE_UINT(serialization_chunk_size, 4096,
1145 : "Custom size for serialization chunks")
1146 :
1147 : // Regexp
1148 84 : DEFINE_BOOL(regexp_optimization, true, "generate optimized regexp code")
1149 84 : DEFINE_BOOL(regexp_mode_modifiers, false, "enable inline flags in regexp.")
1150 84 : DEFINE_BOOL(regexp_interpret_all, false, "interpret all regexp code")
1151 :
1152 : // Testing flags test/cctest/test-{flags,api,serialization}.cc
1153 84 : DEFINE_BOOL(testing_bool_flag, true, "testing_bool_flag")
1154 84 : DEFINE_MAYBE_BOOL(testing_maybe_bool_flag, "testing_maybe_bool_flag")
1155 84 : DEFINE_INT(testing_int_flag, 13, "testing_int_flag")
1156 84 : DEFINE_FLOAT(testing_float_flag, 2.5, "float-flag")
1157 84 : DEFINE_STRING(testing_string_flag, "Hello, world!", "string-flag")
1158 84 : DEFINE_INT(testing_prng_seed, 42, "Seed used for threading test randomness")
1159 :
1160 : // mksnapshot.cc
1161 84 : DEFINE_STRING(embedded_src, nullptr,
1162 : "Path for the generated embedded data file. (mksnapshot only)")
1163 84 : DEFINE_STRING(
1164 : embedded_variant, nullptr,
1165 : "Label to disambiguate symbols in embedded data file. (mksnapshot only)")
1166 84 : DEFINE_STRING(startup_src, nullptr,
1167 : "Write V8 startup as C++ src. (mksnapshot only)")
1168 84 : DEFINE_STRING(startup_blob, nullptr,
1169 : "Write V8 startup blob file. (mksnapshot only)")
1170 :
1171 : //
1172 : // Minor mark compact collector flags.
1173 : //
1174 : #ifdef ENABLE_MINOR_MC
1175 84 : DEFINE_BOOL(minor_mc_parallel_marking, true,
1176 : "use parallel marking for the young generation")
1177 84 : DEFINE_BOOL(trace_minor_mc_parallel_marking, false,
1178 : "trace parallel marking for the young generation")
1179 84 : DEFINE_BOOL(minor_mc, false, "perform young generation mark compact GCs")
1180 : #endif // ENABLE_MINOR_MC
1181 :
1182 : //
1183 : // Dev shell flags
1184 : //
1185 :
1186 84 : DEFINE_BOOL(help, false, "Print usage message, including flags, on console")
1187 84 : DEFINE_BOOL(dump_counters, false, "Dump counters on exit")
1188 84 : DEFINE_BOOL(dump_counters_nvp, false,
1189 : "Dump counters as name-value pairs on exit")
1190 84 : DEFINE_BOOL(use_external_strings, false, "Use external strings for source code")
1191 :
1192 84 : DEFINE_STRING(map_counters, "", "Map counters to a file")
1193 84 : DEFINE_BOOL(mock_arraybuffer_allocator, false,
1194 : "Use a mock ArrayBuffer allocator for testing.")
1195 84 : DEFINE_SIZE_T(mock_arraybuffer_allocator_limit, 0,
1196 : "Memory limit for mock ArrayBuffer allocator used to simulate "
1197 : "OOM for testing.")
1198 :
1199 : //
1200 : // Flags only available in non-Lite modes.
1201 : //
1202 : #undef FLAG
1203 : #ifdef V8_LITE_MODE
1204 : #define FLAG FLAG_READONLY
1205 : #else
1206 : #define FLAG FLAG_FULL
1207 : #endif
1208 :
1209 84 : DEFINE_BOOL(jitless, V8_LITE_BOOL,
1210 : "Disable runtime allocation of executable memory.")
1211 :
1212 : // Jitless V8 has a few implications:
1213 : #ifndef V8_LITE_MODE
1214 : // Optimizations (i.e. jitting) are disabled.
1215 171179 : DEFINE_NEG_IMPLICATION(jitless, opt)
1216 : #endif
1217 : // Field representation tracking is only used by TurboFan.
1218 171179 : DEFINE_NEG_IMPLICATION(jitless, track_field_types)
1219 171179 : DEFINE_NEG_IMPLICATION(jitless, track_heap_object_fields)
1220 : // Regexps are interpreted.
1221 171179 : DEFINE_IMPLICATION(jitless, regexp_interpret_all)
1222 : // asm.js validation is disabled since it triggers wasm code generation.
1223 171179 : DEFINE_NEG_IMPLICATION(jitless, validate_asm)
1224 : // Wasm is put into interpreter-only mode. We repeat flag implications down
1225 : // here to ensure they're applied correctly by setting the --jitless flag.
1226 171179 : DEFINE_IMPLICATION(jitless, wasm_interpret_all)
1227 171179 : DEFINE_NEG_IMPLICATION(jitless, asm_wasm_lazy_compilation)
1228 171179 : DEFINE_NEG_IMPLICATION(jitless, wasm_lazy_compilation)
1229 : // --jitless also implies --no-expose-wasm, see InitializeOncePerProcessImpl.
1230 :
1231 : // Enable recompilation of function with optimized code.
1232 84 : DEFINE_BOOL(opt, !V8_LITE_BOOL, "use adaptive optimizations")
1233 :
1234 : // Enable use of inline caches to optimize object access operations.
1235 84 : DEFINE_BOOL(use_ic, !V8_LITE_BOOL, "use inline caching")
1236 :
1237 : // Favor memory over execution speed.
1238 84 : DEFINE_BOOL(optimize_for_size, V8_LITE_BOOL,
1239 : "Enables optimizations which favor memory size over execution "
1240 : "speed")
1241 171179 : DEFINE_VALUE_IMPLICATION(optimize_for_size, max_semi_space_size, 1)
1242 :
1243 : //
1244 : // GDB JIT integration flags.
1245 : //
1246 : #undef FLAG
1247 : #ifdef ENABLE_GDB_JIT_INTERFACE
1248 : #define FLAG FLAG_FULL
1249 : #else
1250 : #define FLAG FLAG_READONLY
1251 : #endif
1252 :
1253 84 : DEFINE_BOOL(gdbjit, false, "enable GDBJIT interface")
1254 84 : DEFINE_BOOL(gdbjit_full, false, "enable GDBJIT interface for all code objects")
1255 84 : DEFINE_BOOL(gdbjit_dump, false, "dump elf objects with debug info to disk")
1256 84 : DEFINE_STRING(gdbjit_dump_filter, "",
1257 : "dump only objects containing this substring")
1258 :
1259 : #ifdef ENABLE_GDB_JIT_INTERFACE
1260 171179 : DEFINE_IMPLICATION(gdbjit_full, gdbjit)
1261 171179 : DEFINE_IMPLICATION(gdbjit_dump, gdbjit)
1262 : #endif
1263 171179 : DEFINE_NEG_IMPLICATION(gdbjit, compact_code_space)
1264 :
1265 : //
1266 : // Debug only flags
1267 : //
1268 : #undef FLAG
1269 : #ifdef DEBUG
1270 : #define FLAG FLAG_FULL
1271 : #else
1272 : #define FLAG FLAG_READONLY
1273 : #endif
1274 :
1275 : // checks.cc
1276 : #ifdef ENABLE_SLOW_DCHECKS
1277 : DEFINE_BOOL(enable_slow_asserts, true,
1278 : "enable asserts that are slow to execute")
1279 : #endif
1280 :
1281 : // codegen-ia32.cc / codegen-arm.cc / macro-assembler-*.cc
1282 : DEFINE_BOOL(print_ast, false, "print source AST")
1283 : DEFINE_BOOL(trap_on_abort, false, "replace aborts by breakpoints")
1284 :
1285 : // compiler.cc
1286 : DEFINE_BOOL(print_builtin_scopes, false, "print scopes for builtins")
1287 : DEFINE_BOOL(print_scopes, false, "print scopes")
1288 :
1289 : // contexts.cc
1290 : DEFINE_BOOL(trace_contexts, false, "trace contexts operations")
1291 :
1292 : // heap.cc
1293 : DEFINE_BOOL(gc_verbose, false, "print stuff during garbage collection")
1294 : DEFINE_BOOL(code_stats, false, "report code statistics after GC")
1295 : DEFINE_BOOL(print_handles, false, "report handles after GC")
1296 : DEFINE_BOOL(check_handle_count, false,
1297 : "Check that there are not too many handles at GC")
1298 : DEFINE_BOOL(print_global_handles, false, "report global handles after GC")
1299 :
1300 : // TurboFan debug-only flags.
1301 : DEFINE_BOOL(trace_turbo_escape, false, "enable tracing in escape analysis")
1302 :
1303 : // objects.cc
1304 : DEFINE_BOOL(trace_module_status, false,
1305 : "Trace status transitions of ECMAScript modules")
1306 : DEFINE_BOOL(trace_normalization, false,
1307 : "prints when objects are turned into dictionaries.")
1308 :
1309 : // runtime.cc
1310 : DEFINE_BOOL(trace_lazy, false, "trace lazy compilation")
1311 :
1312 : // spaces.cc
1313 : DEFINE_BOOL(collect_heap_spill_statistics, false,
1314 : "report heap spill statistics along with heap_stats "
1315 : "(requires heap_stats)")
1316 : DEFINE_BOOL(trace_isolates, false, "trace isolate state changes")
1317 :
1318 : // Regexp
1319 : DEFINE_BOOL(regexp_possessive_quantifier, false,
1320 : "enable possessive quantifier syntax for testing")
1321 : DEFINE_BOOL(trace_regexp_bytecodes, false, "trace regexp bytecode execution")
1322 : DEFINE_BOOL(trace_regexp_assembler, false,
1323 : "trace regexp macro assembler calls.")
1324 : DEFINE_BOOL(trace_regexp_parser, false, "trace regexp parsing")
1325 :
1326 : // Debugger
1327 : DEFINE_BOOL(print_break_location, false, "print source location on debug break")
1328 :
1329 : // wasm instance management
1330 : DEFINE_DEBUG_BOOL(trace_wasm_instances, false,
1331 : "trace creation and collection of wasm instances")
1332 :
1333 : //
1334 : // Logging and profiling flags
1335 : //
1336 : #undef FLAG
1337 : #define FLAG FLAG_FULL
1338 :
1339 : // log.cc
1340 84 : DEFINE_BOOL(log, false,
1341 : "Minimal logging (no API, code, GC, suspect, or handles samples).")
1342 84 : DEFINE_BOOL(log_all, false, "Log all events to the log file.")
1343 84 : DEFINE_BOOL(log_api, false, "Log API events to the log file.")
1344 84 : DEFINE_BOOL(log_code, false,
1345 : "Log code events to the log file without profiling.")
1346 84 : DEFINE_BOOL(log_handles, false, "Log global handle events.")
1347 84 : DEFINE_BOOL(log_suspect, false, "Log suspect operations.")
1348 84 : DEFINE_BOOL(log_source_code, false, "Log source code.")
1349 84 : DEFINE_BOOL(log_function_events, false,
1350 : "Log function events "
1351 : "(parse, compile, execute) separately.")
1352 84 : DEFINE_BOOL(prof, false,
1353 : "Log statistical profiling information (implies --log-code).")
1354 :
1355 84 : DEFINE_BOOL(detailed_line_info, false,
1356 : "Always generate detailed line information for CPU profiling.")
1357 :
1358 : #if defined(ANDROID)
1359 : // Phones and tablets have processors that are much slower than desktop
1360 : // and laptop computers for which current heuristics are tuned.
1361 : #define DEFAULT_PROF_SAMPLING_INTERVAL 5000
1362 : #else
1363 : #define DEFAULT_PROF_SAMPLING_INTERVAL 1000
1364 : #endif
1365 84 : DEFINE_INT(prof_sampling_interval, DEFAULT_PROF_SAMPLING_INTERVAL,
1366 : "Interval for --prof samples (in microseconds).")
1367 : #undef DEFAULT_PROF_SAMPLING_INTERVAL
1368 :
1369 84 : DEFINE_BOOL(prof_cpp, false, "Like --prof, but ignore generated code.")
1370 171179 : DEFINE_IMPLICATION(prof, prof_cpp)
1371 84 : DEFINE_BOOL(prof_browser_mode, true,
1372 : "Used with --prof, turns on browser-compatible mode for profiling.")
1373 84 : DEFINE_STRING(logfile, "v8.log", "Specify the name of the log file.")
1374 84 : DEFINE_BOOL(logfile_per_isolate, true, "Separate log files for each isolate.")
1375 84 : DEFINE_BOOL(ll_prof, false, "Enable low-level linux profiler.")
1376 84 : DEFINE_BOOL(perf_basic_prof, false,
1377 : "Enable perf linux profiler (basic support).")
1378 171179 : DEFINE_NEG_IMPLICATION(perf_basic_prof, compact_code_space)
1379 84 : DEFINE_BOOL(perf_basic_prof_only_functions, false,
1380 : "Only report function code ranges to perf (i.e. no stubs).")
1381 171179 : DEFINE_IMPLICATION(perf_basic_prof_only_functions, perf_basic_prof)
1382 84 : DEFINE_BOOL(perf_prof, false,
1383 : "Enable perf linux profiler (experimental annotate support).")
1384 171179 : DEFINE_NEG_IMPLICATION(perf_prof, compact_code_space)
1385 : // TODO(v8:8462) Remove implication once perf supports remapping.
1386 171179 : DEFINE_NEG_IMPLICATION(perf_prof, write_protect_code_memory)
1387 171179 : DEFINE_NEG_IMPLICATION(perf_prof, wasm_write_protect_code_memory)
1388 84 : DEFINE_BOOL(perf_prof_unwinding_info, false,
1389 : "Enable unwinding info for perf linux profiler (experimental).")
1390 171179 : DEFINE_IMPLICATION(perf_prof, perf_prof_unwinding_info)
1391 84 : DEFINE_STRING(gc_fake_mmap, "/tmp/__v8_gc__",
1392 : "Specify the name of the file for fake gc mmap used in ll_prof")
1393 84 : DEFINE_BOOL(log_internal_timer_events, false, "Time internal events.")
1394 84 : DEFINE_BOOL(log_timer_events, false,
1395 : "Time events including external callbacks.")
1396 171179 : DEFINE_IMPLICATION(log_timer_events, log_internal_timer_events)
1397 171179 : DEFINE_IMPLICATION(log_internal_timer_events, prof)
1398 84 : DEFINE_BOOL(log_instruction_stats, false, "Log AArch64 instruction statistics.")
1399 84 : DEFINE_STRING(log_instruction_file, "arm64_inst.csv",
1400 : "AArch64 instruction statistics log file.")
1401 84 : DEFINE_INT(log_instruction_period, 1 << 22,
1402 : "AArch64 instruction statistics logging period.")
1403 :
1404 84 : DEFINE_BOOL(redirect_code_traces, false,
1405 : "output deopt information and disassembly into file "
1406 : "code-<pid>-<isolate id>.asm")
1407 84 : DEFINE_STRING(redirect_code_traces_to, nullptr,
1408 : "output deopt information and disassembly into the given file")
1409 :
1410 84 : DEFINE_BOOL(print_opt_source, false,
1411 : "print source code of optimized and inlined functions")
1412 :
1413 : #ifdef V8_TARGET_ARCH_ARM
1414 : // Unsupported on arm. See https://crbug.com/v8/8713.
1415 : DEFINE_BOOL_READONLY(
1416 : interpreted_frames_native_stack, false,
1417 : "Show interpreted frames on the native stack (useful for external "
1418 : "profilers).")
1419 : #else
1420 84 : DEFINE_BOOL(interpreted_frames_native_stack, false,
1421 : "Show interpreted frames on the native stack (useful for external "
1422 : "profilers).")
1423 : #endif
1424 :
1425 : //
1426 : // Disassembler only flags
1427 : //
1428 : #undef FLAG
1429 : #ifdef ENABLE_DISASSEMBLER
1430 : #define FLAG FLAG_FULL
1431 : #else
1432 : #define FLAG FLAG_READONLY
1433 : #endif
1434 :
1435 : // elements.cc
1436 : DEFINE_BOOL(trace_elements_transitions, false, "trace elements transitions")
1437 :
1438 : DEFINE_BOOL(trace_creation_allocation_sites, false,
1439 : "trace the creation of allocation sites")
1440 :
1441 : // codegen-ia32.cc / codegen-arm.cc
1442 : DEFINE_BOOL(print_code, false, "print generated code")
1443 : DEFINE_BOOL(print_opt_code, false, "print optimized code")
1444 : DEFINE_STRING(print_opt_code_filter, "*", "filter for printing optimized code")
1445 : DEFINE_BOOL(print_code_verbose, false, "print more information for code")
1446 : DEFINE_BOOL(print_builtin_code, false, "print generated code for builtins")
1447 : DEFINE_STRING(print_builtin_code_filter, "*",
1448 : "filter for printing builtin code")
1449 : DEFINE_BOOL(print_builtin_size, false, "print code size for builtins")
1450 :
1451 : #ifdef ENABLE_DISASSEMBLER
1452 : DEFINE_BOOL(sodium, false,
1453 : "print generated code output suitable for use with "
1454 : "the Sodium code viewer")
1455 :
1456 : DEFINE_IMPLICATION(sodium, print_code)
1457 : DEFINE_IMPLICATION(sodium, print_opt_code)
1458 : DEFINE_IMPLICATION(sodium, code_comments)
1459 :
1460 : DEFINE_BOOL(print_all_code, false, "enable all flags related to printing code")
1461 : DEFINE_IMPLICATION(print_all_code, print_code)
1462 : DEFINE_IMPLICATION(print_all_code, print_opt_code)
1463 : DEFINE_IMPLICATION(print_all_code, print_code_verbose)
1464 : DEFINE_IMPLICATION(print_all_code, print_builtin_code)
1465 : DEFINE_IMPLICATION(print_all_code, code_comments)
1466 : #endif
1467 :
1468 : #undef FLAG
1469 : #define FLAG FLAG_FULL
1470 :
1471 : //
1472 : // Predictable mode related flags.
1473 : //
1474 :
1475 84 : DEFINE_BOOL(predictable, false, "enable predictable mode")
1476 171179 : DEFINE_IMPLICATION(predictable, single_threaded)
1477 171179 : DEFINE_NEG_IMPLICATION(predictable, memory_reducer)
1478 171179 : DEFINE_VALUE_IMPLICATION(single_threaded, wasm_num_compilation_tasks, 0)
1479 171179 : DEFINE_NEG_IMPLICATION(single_threaded, wasm_async_compilation)
1480 :
1481 84 : DEFINE_BOOL(predictable_gc_schedule, false,
1482 : "Predictable garbage collection schedule. Fixes heap growing, "
1483 : "idle, and memory reducing behavior.")
1484 171179 : DEFINE_VALUE_IMPLICATION(predictable_gc_schedule, min_semi_space_size, 4)
1485 171179 : DEFINE_VALUE_IMPLICATION(predictable_gc_schedule, max_semi_space_size, 4)
1486 171179 : DEFINE_VALUE_IMPLICATION(predictable_gc_schedule, heap_growing_percent, 30)
1487 171179 : DEFINE_NEG_IMPLICATION(predictable_gc_schedule, idle_time_scavenge)
1488 171179 : DEFINE_NEG_IMPLICATION(predictable_gc_schedule, memory_reducer)
1489 :
1490 : //
1491 : // Threading related flags.
1492 : //
1493 :
1494 84 : DEFINE_BOOL(single_threaded, false, "disable the use of background tasks")
1495 171179 : DEFINE_IMPLICATION(single_threaded, single_threaded_gc)
1496 171179 : DEFINE_NEG_IMPLICATION(single_threaded, concurrent_recompilation)
1497 171179 : DEFINE_NEG_IMPLICATION(single_threaded, compiler_dispatcher)
1498 :
1499 : //
1500 : // Parallel and concurrent GC (Orinoco) related flags.
1501 : //
1502 84 : DEFINE_BOOL(single_threaded_gc, false, "disable the use of background gc tasks")
1503 171179 : DEFINE_NEG_IMPLICATION(single_threaded_gc, concurrent_marking)
1504 171179 : DEFINE_NEG_IMPLICATION(single_threaded_gc, concurrent_sweeping)
1505 171179 : DEFINE_NEG_IMPLICATION(single_threaded_gc, parallel_compaction)
1506 171179 : DEFINE_NEG_IMPLICATION(single_threaded_gc, parallel_marking)
1507 171179 : DEFINE_NEG_IMPLICATION(single_threaded_gc, parallel_pointer_update)
1508 171179 : DEFINE_NEG_IMPLICATION(single_threaded_gc, parallel_scavenge)
1509 171179 : DEFINE_NEG_IMPLICATION(single_threaded_gc, concurrent_store_buffer)
1510 : #ifdef ENABLE_MINOR_MC
1511 171179 : DEFINE_NEG_IMPLICATION(single_threaded_gc, minor_mc_parallel_marking)
1512 : #endif // ENABLE_MINOR_MC
1513 171179 : DEFINE_NEG_IMPLICATION(single_threaded_gc, concurrent_array_buffer_freeing)
1514 :
1515 : #undef FLAG
1516 :
1517 : #ifdef VERIFY_PREDICTABLE
1518 : #define FLAG FLAG_FULL
1519 : #else
1520 : #define FLAG FLAG_READONLY
1521 : #endif
1522 :
1523 : DEFINE_BOOL(verify_predictable, false,
1524 : "this mode is used for checking that V8 behaves predictably")
1525 : DEFINE_INT(dump_allocations_digest_at_alloc, -1,
1526 : "dump allocations digest each n-th allocation")
1527 :
1528 : //
1529 : // Read-only flags
1530 : //
1531 : #undef FLAG
1532 : #define FLAG FLAG_READONLY
1533 :
1534 : // assembler.h
1535 : DEFINE_BOOL(enable_embedded_constant_pool, V8_EMBEDDED_CONSTANT_POOL,
1536 : "enable use of embedded constant pools (PPC only)")
1537 :
1538 : DEFINE_BOOL(unbox_double_fields, V8_DOUBLE_FIELDS_UNBOXING,
1539 : "enable in-object double fields unboxing (64-bit only)")
1540 : DEFINE_IMPLICATION(unbox_double_fields, track_double_fields)
1541 :
1542 : DEFINE_BOOL(raw_heap_snapshots, V8_ENABLE_RAW_HEAP_SNAPSHOTS_BOOL,
1543 : "enable raw heap snapshots contain garbage collection internals")
1544 :
1545 : DEFINE_BOOL(lite_mode, V8_LITE_BOOL,
1546 : "enables trade-off of performance for memory savings "
1547 : "(Lite mode only)")
1548 :
1549 : // Cleanup...
1550 : #undef FLAG_FULL
1551 : #undef FLAG_READONLY
1552 : #undef FLAG
1553 : #undef FLAG_ALIAS
1554 :
1555 : #undef DEFINE_BOOL
1556 : #undef DEFINE_MAYBE_BOOL
1557 : #undef DEFINE_DEBUG_BOOL
1558 : #undef DEFINE_INT
1559 : #undef DEFINE_STRING
1560 : #undef DEFINE_FLOAT
1561 : #undef DEFINE_IMPLICATION
1562 : #undef DEFINE_NEG_IMPLICATION
1563 : #undef DEFINE_NEG_VALUE_IMPLICATION
1564 : #undef DEFINE_VALUE_IMPLICATION
1565 : #undef DEFINE_GENERIC_IMPLICATION
1566 : #undef DEFINE_ALIAS_BOOL
1567 : #undef DEFINE_ALIAS_INT
1568 : #undef DEFINE_ALIAS_STRING
1569 : #undef DEFINE_ALIAS_FLOAT
1570 :
1571 : #undef FLAG_MODE_DECLARE
1572 : #undef FLAG_MODE_DEFINE
1573 : #undef FLAG_MODE_DEFINE_DEFAULTS
1574 : #undef FLAG_MODE_META
1575 : #undef FLAG_MODE_DEFINE_IMPLICATIONS
1576 : #undef FLAG_MODE_APPLY
1577 :
1578 : #undef COMMA
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