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_proxies, false, "enable harmony proxies")
145 DEFINE_bool(harmony_collections, false,
146 "enable harmony collections (sets, maps, and weak maps)")
147 DEFINE_bool(harmony, false, "enable all harmony features (except typeof)")
148 DEFINE_implication(harmony, harmony_scoping)
149 DEFINE_implication(harmony, harmony_modules)
150 DEFINE_implication(harmony, harmony_proxies)
151 DEFINE_implication(harmony, harmony_collections)
152 DEFINE_implication(harmony_modules, harmony_scoping)
154 // Flags for experimental implementation features.
155 DEFINE_bool(packed_arrays, true, "optimizes arrays that have no holes")
156 DEFINE_bool(smi_only_arrays, true, "tracks arrays with only smi values")
157 DEFINE_bool(clever_optimizations,
159 "Optimize object size, Array shift, DOM strings and string +")
161 // Flags for data representation optimizations
162 DEFINE_bool(unbox_double_arrays, true, "automatically unbox arrays of doubles")
163 DEFINE_bool(string_slices, true, "use string slices")
165 // Flags for Crankshaft.
166 DEFINE_bool(crankshaft, true, "use crankshaft")
167 DEFINE_string(hydrogen_filter, "", "optimization filter")
168 DEFINE_bool(use_range, true, "use hydrogen range analysis")
169 DEFINE_bool(eliminate_dead_phis, true, "eliminate dead phis")
170 DEFINE_bool(use_gvn, true, "use hydrogen global value numbering")
171 DEFINE_bool(use_canonicalizing, true, "use hydrogen instruction canonicalizing")
172 DEFINE_bool(use_inlining, true, "use function inlining")
173 DEFINE_int(max_inlined_source_size, 600,
174 "maximum source size in bytes considered for a single inlining")
175 DEFINE_int(max_inlined_nodes, 196,
176 "maximum number of AST nodes considered for a single inlining")
177 DEFINE_int(max_inlined_nodes_cumulative, 196,
178 "maximum cumulative number of AST nodes considered for inlining")
179 DEFINE_bool(loop_invariant_code_motion, true, "loop invariant code motion")
180 DEFINE_bool(collect_megamorphic_maps_from_stub_cache,
182 "crankshaft harvests type feedback from stub cache")
183 DEFINE_bool(hydrogen_stats, false, "print statistics for hydrogen")
184 DEFINE_bool(trace_hydrogen, false, "trace generated hydrogen to file")
185 DEFINE_string(trace_phase, "Z", "trace generated IR for specified phases")
186 DEFINE_bool(trace_inlining, false, "trace inlining decisions")
187 DEFINE_bool(trace_alloc, false, "trace register allocator")
188 DEFINE_bool(trace_all_uses, false, "trace all use positions")
189 DEFINE_bool(trace_range, false, "trace range analysis")
190 DEFINE_bool(trace_gvn, false, "trace global value numbering")
191 DEFINE_bool(trace_representation, false, "trace representation types")
192 DEFINE_bool(stress_pointer_maps, false, "pointer map for every instruction")
193 DEFINE_bool(stress_environments, false, "environment for every instruction")
194 DEFINE_int(deopt_every_n_times,
196 "deoptimize every n times a deopt point is passed")
197 DEFINE_bool(trap_on_deopt, false, "put a break point before deoptimizing")
198 DEFINE_bool(deoptimize_uncommon_cases, true, "deoptimize uncommon cases")
199 DEFINE_bool(polymorphic_inlining, true, "polymorphic inlining")
200 DEFINE_bool(use_osr, true, "use on-stack replacement")
201 DEFINE_bool(array_bounds_checks_elimination, true,
202 "perform array bounds checks elimination")
203 DEFINE_bool(array_index_dehoisting, true,
204 "perform array index dehoisting")
205 DEFINE_bool(dead_code_elimination, true, "use dead code elimination")
206 DEFINE_bool(trace_dead_code_elimination, false, "trace dead code elimination")
208 DEFINE_bool(trace_osr, false, "trace on-stack replacement")
209 DEFINE_int(stress_runs, 0, "number of stress runs")
210 DEFINE_bool(optimize_closures, true, "optimize closures")
211 DEFINE_bool(lookup_sample_by_shared, true,
212 "when picking a function to optimize, watch for shared function "
213 "info, not JSFunction itself")
214 DEFINE_bool(cache_optimized_code, true,
215 "cache optimized code for closures")
216 DEFINE_bool(inline_construct, true, "inline constructor calls")
217 DEFINE_bool(inline_arguments, true, "inline functions with arguments object")
218 DEFINE_bool(inline_accessors, true, "inline JavaScript accessors")
219 DEFINE_int(loop_weight, 1, "loop weight for representation inference")
221 DEFINE_bool(optimize_for_in, true,
222 "optimize functions containing for-in loops")
223 DEFINE_bool(opt_safe_uint32_operations, true,
224 "allow uint32 values on optimize frames if they are used only in"
227 DEFINE_bool(parallel_recompilation, false,
228 "optimizing hot functions asynchronously on a separate thread")
229 DEFINE_bool(trace_parallel_recompilation, false, "track parallel recompilation")
230 DEFINE_int(parallel_recompilation_queue_length, 2,
231 "the length of the parallel compilation queue")
233 // Experimental profiler changes.
234 DEFINE_bool(experimental_profiler, true, "enable all profiler experiments")
235 DEFINE_bool(watch_ic_patching, false, "profiler considers IC stability")
236 DEFINE_int(frame_count, 1, "number of stack frames inspected by the profiler")
237 DEFINE_bool(self_optimization, false,
238 "primitive functions trigger their own optimization")
239 DEFINE_bool(direct_self_opt, false,
240 "call recompile stub directly when self-optimizing")
241 DEFINE_bool(retry_self_opt, false, "re-try self-optimization if it failed")
242 DEFINE_bool(count_based_interrupts, false,
243 "trigger profiler ticks based on counting instead of timing")
244 DEFINE_bool(interrupt_at_exit, false,
245 "insert an interrupt check at function exit")
246 DEFINE_bool(weighted_back_edges, false,
247 "weight back edges by jump distance for interrupt triggering")
248 // 0x1700 fits in the immediate field of an ARM instruction.
249 DEFINE_int(interrupt_budget, 0x1700,
250 "execution budget before interrupt is triggered")
251 DEFINE_int(type_info_threshold, 15,
252 "percentage of ICs that must have type info to allow optimization")
253 DEFINE_int(self_opt_count, 130, "call count before self-optimization")
255 DEFINE_implication(experimental_profiler, watch_ic_patching)
256 DEFINE_implication(experimental_profiler, self_optimization)
257 // Not implying direct_self_opt here because it seems to be a bad idea.
258 DEFINE_implication(experimental_profiler, retry_self_opt)
259 DEFINE_implication(experimental_profiler, count_based_interrupts)
260 DEFINE_implication(experimental_profiler, interrupt_at_exit)
261 DEFINE_implication(experimental_profiler, weighted_back_edges)
263 DEFINE_bool(trace_opt_verbose, false, "extra verbose compilation tracing")
264 DEFINE_implication(trace_opt_verbose, trace_opt)
266 // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc
267 DEFINE_bool(debug_code, false,
268 "generate extra code (assertions) for debugging")
269 DEFINE_bool(code_comments, false, "emit comments in code disassembly")
270 DEFINE_bool(enable_sse2, true,
271 "enable use of SSE2 instructions if available")
272 DEFINE_bool(enable_sse3, true,
273 "enable use of SSE3 instructions if available")
274 DEFINE_bool(enable_sse4_1, true,
275 "enable use of SSE4.1 instructions if available")
276 DEFINE_bool(enable_cmov, true,
277 "enable use of CMOV instruction if available")
278 DEFINE_bool(enable_rdtsc, true,
279 "enable use of RDTSC instruction if available")
280 DEFINE_bool(enable_sahf, true,
281 "enable use of SAHF instruction if available (X64 only)")
282 DEFINE_bool(enable_vfp3, true,
283 "enable use of VFP3 instructions if available - this implies "
284 "enabling ARMv7 and VFP2 instructions (ARM only)")
285 DEFINE_bool(enable_vfp2, true,
286 "enable use of VFP2 instructions if available")
287 DEFINE_bool(enable_armv7, true,
288 "enable use of ARMv7 instructions if available (ARM only)")
289 DEFINE_bool(enable_sudiv, true,
290 "enable use of SDIV and UDIV instructions if available (ARM only)")
291 DEFINE_bool(enable_movw_movt, false,
292 "enable loading 32-bit constant by means of movw/movt "
293 "instruction pairs (ARM only)")
294 DEFINE_bool(enable_unaligned_accesses, true,
295 "enable unaligned accesses for ARMv7 (ARM only)")
296 DEFINE_bool(enable_fpu, true,
297 "enable use of MIPS FPU instructions if available (MIPS only)")
300 DEFINE_string(expose_natives_as, NULL, "expose natives in global object")
301 DEFINE_string(expose_debug_as, NULL, "expose debug in global object")
302 DEFINE_bool(expose_gc, false, "expose gc extension")
303 DEFINE_bool(expose_externalize_string, false,
304 "expose externalize string extension")
305 DEFINE_int(stack_trace_limit, 10, "number of stack frames to capture")
306 DEFINE_bool(builtins_in_stack_traces, false,
307 "show built-in functions in stack traces")
308 DEFINE_bool(disable_native_files, false, "disable builtin natives files")
311 DEFINE_bool(inline_new, true, "use fast inline allocation")
314 DEFINE_bool(stack_trace_on_abort, true,
315 "print a stack trace if an assertion failure occurs")
317 // codegen-ia32.cc / codegen-arm.cc
318 DEFINE_bool(trace, false, "trace function calls")
319 DEFINE_bool(mask_constants_with_cookie,
321 "use random jit cookie to mask large constants")
324 DEFINE_bool(lazy, true, "use lazy compilation")
325 DEFINE_bool(trace_opt, false, "trace lazy optimization")
326 DEFINE_bool(trace_opt_stats, false, "trace lazy optimization statistics")
327 DEFINE_bool(opt, true, "use adaptive optimizations")
328 DEFINE_bool(always_opt, false, "always try to optimize functions")
329 DEFINE_bool(prepare_always_opt, false, "prepare for turning on always opt")
330 DEFINE_bool(trace_deopt, false, "trace deoptimization")
333 DEFINE_int(min_preparse_length, 1024,
334 "minimum length for automatic enable preparsing")
335 DEFINE_bool(always_full_compiler, false,
336 "try to use the dedicated run-once backend for all code")
337 DEFINE_int(max_opt_count, 10,
338 "maximum number of optimization attempts before giving up.")
340 // compilation-cache.cc
341 DEFINE_bool(compilation_cache, true, "enable compilation cache")
343 DEFINE_bool(cache_prototype_transitions, true, "cache prototype transitions")
346 DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response")
347 DEFINE_bool(debugger_auto_break, true,
348 "automatically set the debug break flag when debugger commands are "
350 DEFINE_bool(enable_liveedit, true, "enable liveedit experimental feature")
351 DEFINE_bool(break_on_abort, true, "always cause a debug break before aborting")
354 // Slightly less than 1MB on 64-bit, since Windows' default stack size for
355 // the main execution thread is 1MB for both 32 and 64-bit.
356 DEFINE_int(stack_size, kPointerSize * 123,
357 "default size of stack region v8 is allowed to use (in kBytes)")
360 DEFINE_int(max_stack_trace_source_length, 300,
361 "maximum length of function source code printed in a stack trace.")
364 DEFINE_bool(always_inline_smi_code, false,
365 "always inline smi code in non-opt code")
368 DEFINE_int(max_new_space_size, 0, "max size of the new generation (in kBytes)")
369 DEFINE_int(max_old_space_size, 0, "max size of the old generation (in Mbytes)")
370 DEFINE_int(max_executable_size, 0, "max size of executable memory (in Mbytes)")
371 DEFINE_bool(gc_global, false, "always perform global GCs")
372 DEFINE_int(gc_interval, -1, "garbage collect after <n> allocations")
373 DEFINE_bool(trace_gc, false,
374 "print one trace line following each garbage collection")
375 DEFINE_bool(trace_gc_nvp, false,
376 "print one detailed trace line in name=value format "
377 "after each garbage collection")
378 DEFINE_bool(trace_gc_ignore_scavenger, false,
379 "do not print trace line after scavenger collection")
380 DEFINE_bool(print_cumulative_gc_stat, false,
381 "print cumulative GC statistics in name=value format on exit")
382 DEFINE_bool(trace_gc_verbose, false,
383 "print more details following each garbage collection")
384 DEFINE_bool(trace_fragmentation, false,
385 "report fragmentation for old pointer and data pages")
386 DEFINE_bool(trace_external_memory, false,
387 "print amount of external allocated memory after each time "
389 DEFINE_bool(collect_maps, true,
390 "garbage collect maps from which no objects can be reached")
391 DEFINE_bool(flush_code, true,
392 "flush code that we expect not to use again before full gc")
393 DEFINE_bool(incremental_marking, true, "use incremental marking")
394 DEFINE_bool(incremental_marking_steps, true, "do incremental marking steps")
395 DEFINE_bool(trace_incremental_marking, false,
396 "trace progress of the incremental marking")
397 DEFINE_bool(track_gc_object_stats, false,
398 "track object counts and memory usage")
400 DEFINE_bool(verify_heap, false, "verify heap pointers before and after GC")
404 DEFINE_bool(use_idle_notification, true,
405 "Use idle notification to reduce memory footprint.")
407 DEFINE_bool(use_ic, true, "use inline caching")
409 #ifdef LIVE_OBJECT_LIST
411 DEFINE_string(lol_workdir, NULL, "path for lol temp files")
412 DEFINE_bool(verify_lol, false, "perform debugging verification for lol")
415 // macro-assembler-ia32.cc
416 DEFINE_bool(native_code_counters, false,
417 "generate extra code for manipulating stats counters")
420 DEFINE_bool(always_compact, false, "Perform compaction on every full GC")
421 DEFINE_bool(lazy_sweeping, true,
422 "Use lazy sweeping for old pointer and data spaces")
423 DEFINE_bool(never_compact, false,
424 "Never perform compaction on full GC - testing only")
425 DEFINE_bool(compact_code_space, true,
426 "Compact code space on full non-incremental collections")
427 DEFINE_bool(incremental_code_compaction, true,
428 "Compact code space on full incremental collections")
429 DEFINE_bool(cleanup_code_caches_at_gc, true,
430 "Flush inline caches prior to mark compact collection and "
431 "flush code caches in maps during mark compact cycle.")
432 DEFINE_int(random_seed, 0,
433 "Default seed for initializing random generator "
434 "(0, the default, means to use system random).")
437 DEFINE_bool(use_verbose_printer, true, "allows verbose printing")
440 DEFINE_bool(allow_natives_syntax, false, "allow natives syntax")
441 DEFINE_bool(trace_parse, false, "trace parsing and preparsing")
443 // simulator-arm.cc and simulator-mips.cc
444 DEFINE_bool(trace_sim, false, "Trace simulator execution")
445 DEFINE_bool(check_icache, false,
446 "Check icache flushes in ARM and MIPS simulator")
447 DEFINE_int(stop_sim_at, 0, "Simulator stop after x number of instructions")
448 DEFINE_int(sim_stack_alignment, 8,
449 "Stack alingment in bytes in simulator (4 or 8, 8 is default)")
452 DEFINE_bool(trace_exception, false,
453 "print stack trace when throwing exceptions")
454 DEFINE_bool(preallocate_message_memory, false,
455 "preallocate some memory to build stack traces.")
456 DEFINE_bool(randomize_hashes,
458 "randomize hashes to avoid predictable hash collisions "
459 "(with snapshots this option cannot override the baked-in seed)")
460 DEFINE_int(hash_seed,
462 "Fixed seed to use to hash property keys (0 means random)"
463 "(with snapshots this option cannot override the baked-in seed)")
466 DEFINE_bool(preemption, false,
467 "activate a 100ms timer that switches between V8 threads")
470 DEFINE_bool(regexp_optimization, true, "generate optimized regexp code")
472 // Testing flags test/cctest/test-{flags,api,serialization}.cc
473 DEFINE_bool(testing_bool_flag, true, "testing_bool_flag")
474 DEFINE_int(testing_int_flag, 13, "testing_int_flag")
475 DEFINE_float(testing_float_flag, 2.5, "float-flag")
476 DEFINE_string(testing_string_flag, "Hello, world!", "string-flag")
477 DEFINE_int(testing_prng_seed, 42, "Seed used for threading test randomness")
479 DEFINE_string(testing_serialization_file, "C:\\Windows\\Temp\\serdes",
480 "file in which to testing_serialize heap")
482 DEFINE_string(testing_serialization_file, "/tmp/serdes",
483 "file in which to serialize heap")
487 DEFINE_string(extra_code, NULL, "A filename with extra code to be included in"
488 " the snapshot (mksnapshot only)")
494 DEFINE_bool(help, false, "Print usage message, including flags, on console")
495 DEFINE_bool(dump_counters, false, "Dump counters on exit")
497 #ifdef ENABLE_DEBUGGER_SUPPORT
498 DEFINE_bool(debugger, false, "Enable JavaScript debugger")
499 DEFINE_bool(remote_debugger, false, "Connect JavaScript debugger to the "
500 "debugger agent in another process")
501 DEFINE_bool(debugger_agent, false, "Enable debugger agent")
502 DEFINE_int(debugger_port, 5858, "Port to use for remote debugging")
503 #endif // ENABLE_DEBUGGER_SUPPORT
505 DEFINE_string(map_counters, "", "Map counters to a file")
506 DEFINE_args(js_arguments, JSARGUMENTS_INIT,
507 "Pass all remaining arguments to the script. Alias for \"--\".")
510 DEFINE_bool(debug_compile_events, false, "Enable debugger compile events")
511 DEFINE_bool(debug_script_collected_events, false,
512 "Enable debugger script collected events")
514 DEFINE_bool(debug_compile_events, true, "Enable debugger compile events")
515 DEFINE_bool(debug_script_collected_events, true,
516 "Enable debugger script collected events")
521 // GDB JIT integration flags.
524 DEFINE_bool(gdbjit, false, "enable GDBJIT interface (disables compacting GC)")
525 DEFINE_bool(gdbjit_full, false, "enable GDBJIT interface for all code objects")
526 DEFINE_bool(gdbjit_dump, false, "dump elf objects with debug info to disk")
527 DEFINE_string(gdbjit_dump_filter, "",
528 "dump only objects containing this substring")
531 DEFINE_bool(force_marking_deque_overflows, false,
532 "force overflows of marking deque by reducing it's size "
535 DEFINE_bool(stress_compaction, false,
536 "stress the GC compactor to flush out bugs (implies "
537 "--force_marking_deque_overflows)")
544 #define FLAG FLAG_FULL
546 #define FLAG FLAG_READONLY
550 DEFINE_bool(enable_slow_asserts, false,
551 "enable asserts that are slow to execute")
553 // codegen-ia32.cc / codegen-arm.cc
554 DEFINE_bool(trace_codegen, false,
555 "print name of functions for which code is generated")
556 DEFINE_bool(print_source, false, "pretty print source code")
557 DEFINE_bool(print_builtin_source, false,
558 "pretty print source code for builtins")
559 DEFINE_bool(print_ast, false, "print source AST")
560 DEFINE_bool(print_builtin_ast, false, "print source AST for builtins")
561 DEFINE_string(stop_at, "", "function name where to insert a breakpoint")
564 DEFINE_bool(print_builtin_scopes, false, "print scopes for builtins")
565 DEFINE_bool(print_scopes, false, "print scopes")
568 DEFINE_bool(trace_contexts, false, "trace contexts operations")
571 DEFINE_bool(gc_greedy, false, "perform GC prior to some allocations")
572 DEFINE_bool(gc_verbose, false, "print stuff during garbage collection")
573 DEFINE_bool(heap_stats, false, "report heap statistics before and after GC")
574 DEFINE_bool(code_stats, false, "report code statistics after GC")
575 DEFINE_bool(verify_native_context_separation, false,
576 "verify that code holds on to at most one native context after GC")
577 DEFINE_bool(print_handles, false, "report handles after GC")
578 DEFINE_bool(print_global_handles, false, "report global handles after GC")
581 DEFINE_bool(trace_ic, false, "trace inline cache state transitions")
584 DEFINE_bool(print_interfaces, false, "print interfaces")
585 DEFINE_bool(print_interface_details, false, "print interface inference details")
586 DEFINE_int(print_interface_depth, 5, "depth for printing interfaces")
589 DEFINE_bool(trace_normalization,
591 "prints when objects are turned into dictionaries.")
594 DEFINE_bool(trace_lazy, false, "trace lazy compilation")
597 DEFINE_bool(collect_heap_spill_statistics, false,
598 "report heap spill statistics along with heap_stats "
599 "(requires heap_stats)")
601 DEFINE_bool(trace_isolates, false, "trace isolate state changes")
604 DEFINE_bool(log_state_changes, false, "Log state changes.")
607 DEFINE_bool(regexp_possessive_quantifier,
609 "enable possessive quantifier syntax for testing")
610 DEFINE_bool(trace_regexp_bytecodes, false, "trace regexp bytecode execution")
611 DEFINE_bool(trace_regexp_assembler,
613 "trace regexp macro assembler calls.")
616 // Logging and profiling flags
619 #define FLAG FLAG_FULL
622 DEFINE_bool(log, false,
623 "Minimal logging (no API, code, GC, suspect, or handles samples).")
624 DEFINE_bool(log_all, false, "Log all events to the log file.")
625 DEFINE_bool(log_runtime, false, "Activate runtime system %Log call.")
626 DEFINE_bool(log_api, false, "Log API events to the log file.")
627 DEFINE_bool(log_code, false,
628 "Log code events to the log file without profiling.")
629 DEFINE_bool(log_gc, false,
630 "Log heap samples on garbage collection for the hp2ps tool.")
631 DEFINE_bool(log_handles, false, "Log global handle events.")
632 DEFINE_bool(log_snapshot_positions, false,
633 "log positions of (de)serialized objects in the snapshot.")
634 DEFINE_bool(log_suspect, false, "Log suspect operations.")
635 DEFINE_bool(prof, false,
636 "Log statistical profiling information (implies --log-code).")
637 DEFINE_bool(prof_auto, true,
638 "Used with --prof, starts profiling automatically")
639 DEFINE_bool(prof_lazy, false,
640 "Used with --prof, only does sampling and logging"
641 " when profiler is active (implies --noprof_auto).")
642 DEFINE_bool(prof_browser_mode, true,
643 "Used with --prof, turns on browser-compatible mode for profiling.")
644 DEFINE_bool(log_regexp, false, "Log regular expression execution.")
645 DEFINE_bool(sliding_state_window, false,
646 "Update sliding state window counters.")
647 DEFINE_string(logfile, "v8.log", "Specify the name of the log file.")
648 DEFINE_bool(ll_prof, false, "Enable low-level linux profiler.")
649 DEFINE_string(gc_fake_mmap, "/tmp/__v8_gc__",
650 "Specify the name of the file for fake gc mmap used in ll_prof")
653 // Disassembler only flags
656 #ifdef ENABLE_DISASSEMBLER
657 #define FLAG FLAG_FULL
659 #define FLAG FLAG_READONLY
663 DEFINE_bool(trace_elements_transitions, false, "trace elements transitions")
666 DEFINE_bool(print_code_stubs, false, "print code stubs")
667 DEFINE_bool(test_secondary_stub_cache,
669 "test secondary stub cache by disabling the primary one")
671 DEFINE_bool(test_primary_stub_cache,
673 "test primary stub cache by disabling the secondary one")
675 // codegen-ia32.cc / codegen-arm.cc
676 DEFINE_bool(print_code, false, "print generated code")
677 DEFINE_bool(print_opt_code, false, "print optimized code")
678 DEFINE_bool(print_unopt_code, false, "print unoptimized code before "
679 "printing optimized code based on it")
680 DEFINE_bool(print_code_verbose, false, "print more information for code")
681 DEFINE_bool(print_builtin_code, false, "print generated code for builtins")
683 #ifdef ENABLE_DISASSEMBLER
684 DEFINE_bool(print_all_code, false, "enable all flags related to printing code")
685 DEFINE_implication(print_all_code, print_code)
686 DEFINE_implication(print_all_code, print_opt_code)
687 DEFINE_implication(print_all_code, print_unopt_code)
688 DEFINE_implication(print_all_code, print_code_verbose)
689 DEFINE_implication(print_all_code, print_builtin_code)
690 DEFINE_implication(print_all_code, print_code_stubs)
691 DEFINE_implication(print_all_code, code_comments)
693 DEFINE_implication(print_all_code, trace_codegen)
705 #undef DEFINE_implication
707 #undef FLAG_MODE_DECLARE
708 #undef FLAG_MODE_DEFINE
709 #undef FLAG_MODE_DEFINE_DEFAULTS
710 #undef FLAG_MODE_META
711 #undef FLAG_MODE_DEFINE_IMPLICATIONS