1// Copyright 2012 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// This file defines all of the flags.  It is separated into different section,
29// for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
30// correct section, and use one of the DEFINE_ macros, without a trailing ';'.
31//
32// This include does not have a guard, because it is a template-style include,
33// which can be included multiple times in different modes.  It expects to have
34// a mode defined before it's included.  The modes are FLAG_MODE_... below:
35
36// We want to declare the names of the variables for the header file.  Normally
37// this will just be an extern declaration, but for a readonly flag we let the
38// compiler make better optimizations by giving it the value.
39#if defined(FLAG_MODE_DECLARE)
40#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
41  extern ctype FLAG_##nam;
42#define FLAG_READONLY(ftype, ctype, nam, def, cmt) \
43  static ctype const FLAG_##nam = def;
44#define DEFINE_implication(whenflag, thenflag)
45
46// We want to supply the actual storage and value for the flag variable in the
47// .cc file.  We only do this for writable flags.
48#elif defined(FLAG_MODE_DEFINE)
49#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
50  ctype FLAG_##nam = def;
51#define FLAG_READONLY(ftype, ctype, nam, def, cmt)
52#define DEFINE_implication(whenflag, thenflag)
53
54// We need to define all of our default values so that the Flag structure can
55// access them by pointer.  These are just used internally inside of one .cc,
56// for MODE_META, so there is no impact on the flags interface.
57#elif defined(FLAG_MODE_DEFINE_DEFAULTS)
58#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
59  static ctype const FLAGDEFAULT_##nam = def;
60#define FLAG_READONLY(ftype, ctype, nam, def, cmt)
61#define DEFINE_implication(whenflag, thenflag)
62
63// We want to write entries into our meta data table, for internal parsing and
64// printing / etc in the flag parser code.  We only do this for writable flags.
65#elif defined(FLAG_MODE_META)
66#define FLAG_FULL(ftype, ctype, nam, def, cmt) \
67  { Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false },
68#define FLAG_READONLY(ftype, ctype, nam, def, cmt)
69#define DEFINE_implication(whenflag, thenflag)
70
71// We produce the code to set flags when it is implied by another flag.
72#elif defined(FLAG_MODE_DEFINE_IMPLICATIONS)
73#define FLAG_FULL(ftype, ctype, nam, def, cmt)
74#define FLAG_READONLY(ftype, ctype, nam, def, cmt)
75#define DEFINE_implication(whenflag, thenflag) \
76  if (FLAG_##whenflag) FLAG_##thenflag = true;
77
78#else
79#error No mode supplied when including flags.defs
80#endif
81
82#ifdef FLAG_MODE_DECLARE
83// Structure used to hold a collection of arguments to the JavaScript code.
84#define JSARGUMENTS_INIT {{}}
85struct JSArguments {
86public:
87  inline int argc() const {
88    return static_cast<int>(storage_[0]);
89  }
90  inline const char** argv() const {
91    return reinterpret_cast<const char**>(storage_[1]);
92  }
93  inline const char*& operator[] (int idx) const {
94    return argv()[idx];
95  }
96  inline JSArguments& operator=(JSArguments args) {
97    set_argc(args.argc());
98    set_argv(args.argv());
99    return *this;
100  }
101  static JSArguments Create(int argc, const char** argv) {
102    JSArguments args;
103    args.set_argc(argc);
104    args.set_argv(argv);
105    return args;
106  }
107private:
108  void set_argc(int argc) {
109    storage_[0] = argc;
110  }
111  void set_argv(const char** argv) {
112    storage_[1] = reinterpret_cast<AtomicWord>(argv);
113  }
114public:
115  // Contains argc and argv. Unfortunately we have to store these two fields
116  // into a single one to avoid making the initialization macro (which would be
117  // "{ 0, NULL }") contain a coma.
118  AtomicWord storage_[2];
119};
120#endif
121
122#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)
127
128//
129// Flags in all modes.
130//
131#define FLAG FLAG_FULL
132
133// Flags for language modes and experimental language features.
134DEFINE_bool(use_strict, false, "enforce strict mode")
135
136DEFINE_bool(harmony_typeof, false, "enable harmony semantics for typeof")
137DEFINE_bool(harmony_scoping, false, "enable harmony block scoping")
138DEFINE_bool(harmony_modules, false,
139            "enable harmony modules (implies block scoping)")
140DEFINE_bool(harmony_proxies, false, "enable harmony proxies")
141DEFINE_bool(harmony_collections, false,
142            "enable harmony collections (sets, maps, and weak maps)")
143DEFINE_bool(harmony, false, "enable all harmony features (except typeof)")
144DEFINE_implication(harmony, harmony_scoping)
145DEFINE_implication(harmony, harmony_modules)
146DEFINE_implication(harmony, harmony_proxies)
147DEFINE_implication(harmony, harmony_collections)
148DEFINE_implication(harmony_modules, harmony_scoping)
149
150// Flags for experimental implementation features.
151DEFINE_bool(smi_only_arrays, true, "tracks arrays with only smi values")
152DEFINE_bool(clever_optimizations,
153            true,
154            "Optimize object size, Array shift, DOM strings and string +")
155
156// Flags for data representation optimizations
157DEFINE_bool(unbox_double_arrays, true, "automatically unbox arrays of doubles")
158DEFINE_bool(string_slices, true, "use string slices")
159
160// Flags for Crankshaft.
161DEFINE_bool(crankshaft, true, "use crankshaft")
162DEFINE_string(hydrogen_filter, "", "optimization filter")
163DEFINE_bool(use_range, true, "use hydrogen range analysis")
164DEFINE_bool(eliminate_dead_phis, true, "eliminate dead phis")
165DEFINE_bool(use_gvn, true, "use hydrogen global value numbering")
166DEFINE_bool(use_canonicalizing, true, "use hydrogen instruction canonicalizing")
167DEFINE_bool(use_inlining, true, "use function inlining")
168DEFINE_bool(limit_inlining, true, "limit code size growth from inlining")
169DEFINE_bool(loop_invariant_code_motion, true, "loop invariant code motion")
170DEFINE_bool(collect_megamorphic_maps_from_stub_cache,
171            true,
172            "crankshaft harvests type feedback from stub cache")
173DEFINE_bool(hydrogen_stats, false, "print statistics for hydrogen")
174DEFINE_bool(trace_hydrogen, false, "trace generated hydrogen to file")
175DEFINE_string(trace_phase, "Z", "trace generated IR for specified phases")
176DEFINE_bool(trace_inlining, false, "trace inlining decisions")
177DEFINE_bool(trace_alloc, false, "trace register allocator")
178DEFINE_bool(trace_all_uses, false, "trace all use positions")
179DEFINE_bool(trace_range, false, "trace range analysis")
180DEFINE_bool(trace_gvn, false, "trace global value numbering")
181DEFINE_bool(trace_representation, false, "trace representation types")
182DEFINE_bool(stress_pointer_maps, false, "pointer map for every instruction")
183DEFINE_bool(stress_environments, false, "environment for every instruction")
184DEFINE_int(deopt_every_n_times,
185           0,
186           "deoptimize every n times a deopt point is passed")
187DEFINE_bool(trap_on_deopt, false, "put a break point before deoptimizing")
188DEFINE_bool(deoptimize_uncommon_cases, true, "deoptimize uncommon cases")
189DEFINE_bool(polymorphic_inlining, true, "polymorphic inlining")
190DEFINE_bool(use_osr, true, "use on-stack replacement")
191
192DEFINE_bool(trace_osr, false, "trace on-stack replacement")
193DEFINE_int(stress_runs, 0, "number of stress runs")
194DEFINE_bool(optimize_closures, true, "optimize closures")
195DEFINE_bool(inline_construct, true, "inline constructor calls")
196DEFINE_bool(inline_arguments, true, "inline functions with arguments object")
197DEFINE_int(loop_weight, 1, "loop weight for representation inference")
198
199DEFINE_bool(optimize_for_in, true,
200            "optimize functions containing for-in loops")
201
202// Experimental profiler changes.
203DEFINE_bool(experimental_profiler, true, "enable all profiler experiments")
204DEFINE_bool(watch_ic_patching, false, "profiler considers IC stability")
205DEFINE_int(frame_count, 1, "number of stack frames inspected by the profiler")
206DEFINE_bool(self_optimization, false,
207            "primitive functions trigger their own optimization")
208DEFINE_bool(direct_self_opt, false,
209            "call recompile stub directly when self-optimizing")
210DEFINE_bool(retry_self_opt, false, "re-try self-optimization if it failed")
211DEFINE_bool(count_based_interrupts, false,
212            "trigger profiler ticks based on counting instead of timing")
213DEFINE_bool(interrupt_at_exit, false,
214            "insert an interrupt check at function exit")
215DEFINE_bool(weighted_back_edges, false,
216            "weight back edges by jump distance for interrupt triggering")
217DEFINE_int(interrupt_budget, 5900,
218           "execution budget before interrupt is triggered")
219DEFINE_int(type_info_threshold, 15,
220           "percentage of ICs that must have type info to allow optimization")
221DEFINE_int(self_opt_count, 130, "call count before self-optimization")
222
223DEFINE_implication(experimental_profiler, watch_ic_patching)
224DEFINE_implication(experimental_profiler, self_optimization)
225// Not implying direct_self_opt here because it seems to be a bad idea.
226DEFINE_implication(experimental_profiler, retry_self_opt)
227DEFINE_implication(experimental_profiler, count_based_interrupts)
228DEFINE_implication(experimental_profiler, interrupt_at_exit)
229DEFINE_implication(experimental_profiler, weighted_back_edges)
230
231DEFINE_bool(trace_opt_verbose, false, "extra verbose compilation tracing")
232DEFINE_implication(trace_opt_verbose, trace_opt)
233
234// assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc
235DEFINE_bool(debug_code, false,
236            "generate extra code (assertions) for debugging")
237DEFINE_bool(code_comments, false, "emit comments in code disassembly")
238DEFINE_bool(enable_sse2, true,
239            "enable use of SSE2 instructions if available")
240DEFINE_bool(enable_sse3, true,
241            "enable use of SSE3 instructions if available")
242DEFINE_bool(enable_sse4_1, true,
243            "enable use of SSE4.1 instructions if available")
244DEFINE_bool(enable_cmov, true,
245            "enable use of CMOV instruction if available")
246DEFINE_bool(enable_rdtsc, true,
247            "enable use of RDTSC instruction if available")
248DEFINE_bool(enable_sahf, true,
249            "enable use of SAHF instruction if available (X64 only)")
250DEFINE_bool(enable_vfp3, true,
251            "enable use of VFP3 instructions if available - this implies "
252            "enabling ARMv7 instructions (ARM only)")
253DEFINE_bool(enable_armv7, true,
254            "enable use of ARMv7 instructions if available (ARM only)")
255DEFINE_bool(enable_fpu, true,
256            "enable use of MIPS FPU instructions if available (MIPS only)")
257
258// bootstrapper.cc
259DEFINE_string(expose_natives_as, NULL, "expose natives in global object")
260DEFINE_string(expose_debug_as, NULL, "expose debug in global object")
261DEFINE_bool(expose_gc, false, "expose gc extension")
262DEFINE_bool(expose_externalize_string, false,
263            "expose externalize string extension")
264DEFINE_int(stack_trace_limit, 10, "number of stack frames to capture")
265DEFINE_bool(builtins_in_stack_traces, false,
266            "show built-in functions in stack traces")
267DEFINE_bool(disable_native_files, false, "disable builtin natives files")
268
269// builtins-ia32.cc
270DEFINE_bool(inline_new, true, "use fast inline allocation")
271
272// checks.cc
273DEFINE_bool(stack_trace_on_abort, true,
274            "print a stack trace if an assertion failure occurs")
275
276// codegen-ia32.cc / codegen-arm.cc
277DEFINE_bool(trace, false, "trace function calls")
278DEFINE_bool(mask_constants_with_cookie,
279            true,
280            "use random jit cookie to mask large constants")
281
282// codegen.cc
283DEFINE_bool(lazy, true, "use lazy compilation")
284DEFINE_bool(trace_opt, false, "trace lazy optimization")
285DEFINE_bool(trace_opt_stats, false, "trace lazy optimization statistics")
286DEFINE_bool(opt, true, "use adaptive optimizations")
287DEFINE_bool(always_opt, false, "always try to optimize functions")
288DEFINE_bool(prepare_always_opt, false, "prepare for turning on always opt")
289DEFINE_bool(trace_deopt, false, "trace deoptimization")
290
291// compiler.cc
292DEFINE_int(min_preparse_length, 1024,
293           "minimum length for automatic enable preparsing")
294DEFINE_bool(always_full_compiler, false,
295            "try to use the dedicated run-once backend for all code")
296DEFINE_bool(trace_bailout, false,
297            "print reasons for falling back to using the classic V8 backend")
298
299// compilation-cache.cc
300DEFINE_bool(compilation_cache, true, "enable compilation cache")
301
302DEFINE_bool(cache_prototype_transitions, true, "cache prototype transitions")
303
304// debug.cc
305DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response")
306DEFINE_bool(debugger_auto_break, true,
307            "automatically set the debug break flag when debugger commands are "
308            "in the queue")
309DEFINE_bool(enable_liveedit, true, "enable liveedit experimental feature")
310DEFINE_bool(break_on_abort, true, "always cause a debug break before aborting")
311
312// execution.cc
313// Slightly less than 1MB on 64-bit, since Windows' default stack size for
314// the main execution thread is 1MB for both 32 and 64-bit.
315DEFINE_int(stack_size, kPointerSize * 123,
316           "default size of stack region v8 is allowed to use (in kBytes)")
317
318// frames.cc
319DEFINE_int(max_stack_trace_source_length, 300,
320           "maximum length of function source code printed in a stack trace.")
321
322// full-codegen.cc
323DEFINE_bool(always_inline_smi_code, false,
324            "always inline smi code in non-opt code")
325
326// heap.cc
327DEFINE_int(max_new_space_size, 0, "max size of the new generation (in kBytes)")
328DEFINE_int(max_old_space_size, 0, "max size of the old generation (in Mbytes)")
329DEFINE_int(max_executable_size, 0, "max size of executable memory (in Mbytes)")
330DEFINE_bool(gc_global, false, "always perform global GCs")
331DEFINE_int(gc_interval, -1, "garbage collect after <n> allocations")
332DEFINE_bool(trace_gc, false,
333            "print one trace line following each garbage collection")
334DEFINE_bool(trace_gc_nvp, false,
335            "print one detailed trace line in name=value format "
336            "after each garbage collection")
337DEFINE_bool(print_cumulative_gc_stat, false,
338            "print cumulative GC statistics in name=value format on exit")
339DEFINE_bool(trace_gc_verbose, false,
340            "print more details following each garbage collection")
341DEFINE_bool(trace_fragmentation, false,
342            "report fragmentation for old pointer and data pages")
343DEFINE_bool(collect_maps, true,
344            "garbage collect maps from which no objects can be reached")
345DEFINE_bool(flush_code, true,
346            "flush code that we expect not to use again before full gc")
347DEFINE_bool(incremental_marking, true, "use incremental marking")
348DEFINE_bool(incremental_marking_steps, true, "do incremental marking steps")
349DEFINE_bool(trace_incremental_marking, false,
350            "trace progress of the incremental marking")
351
352// v8.cc
353DEFINE_bool(use_idle_notification, true,
354            "Use idle notification to reduce memory footprint.")
355
356DEFINE_bool(send_idle_notification, false,
357            "Send idle notifcation between stress runs.")
358// ic.cc
359DEFINE_bool(use_ic, true, "use inline caching")
360
361#ifdef LIVE_OBJECT_LIST
362// liveobjectlist.cc
363DEFINE_string(lol_workdir, NULL, "path for lol temp files")
364DEFINE_bool(verify_lol, false, "perform debugging verification for lol")
365#endif
366
367// macro-assembler-ia32.cc
368DEFINE_bool(native_code_counters, false,
369            "generate extra code for manipulating stats counters")
370
371// mark-compact.cc
372DEFINE_bool(always_compact, false, "Perform compaction on every full GC")
373DEFINE_bool(lazy_sweeping, true,
374            "Use lazy sweeping for old pointer and data spaces")
375DEFINE_bool(never_compact, false,
376            "Never perform compaction on full GC - testing only")
377DEFINE_bool(compact_code_space, true,
378            "Compact code space on full non-incremental collections")
379DEFINE_bool(cleanup_code_caches_at_gc, true,
380            "Flush inline caches prior to mark compact collection and "
381            "flush code caches in maps during mark compact cycle.")
382DEFINE_int(random_seed, 0,
383           "Default seed for initializing random generator "
384           "(0, the default, means to use system random).")
385
386// objects.cc
387DEFINE_bool(use_verbose_printer, true, "allows verbose printing")
388
389// parser.cc
390DEFINE_bool(allow_natives_syntax, false, "allow natives syntax")
391
392// simulator-arm.cc and simulator-mips.cc
393DEFINE_bool(trace_sim, false, "Trace simulator execution")
394DEFINE_bool(check_icache, false,
395            "Check icache flushes in ARM and MIPS simulator")
396DEFINE_int(stop_sim_at, 0, "Simulator stop after x number of instructions")
397DEFINE_int(sim_stack_alignment, 8,
398           "Stack alingment in bytes in simulator (4 or 8, 8 is default)")
399
400// isolate.cc
401DEFINE_bool(trace_exception, false,
402            "print stack trace when throwing exceptions")
403DEFINE_bool(preallocate_message_memory, false,
404            "preallocate some memory to build stack traces.")
405DEFINE_bool(randomize_hashes,
406            true,
407            "randomize hashes to avoid predictable hash collisions "
408            "(with snapshots this option cannot override the baked-in seed)")
409DEFINE_int(hash_seed,
410           0,
411           "Fixed seed to use to hash property keys (0 means random)"
412           "(with snapshots this option cannot override the baked-in seed)")
413
414// v8.cc
415DEFINE_bool(preemption, false,
416            "activate a 100ms timer that switches between V8 threads")
417
418// Regexp
419DEFINE_bool(regexp_optimization, true, "generate optimized regexp code")
420
421// Testing flags test/cctest/test-{flags,api,serialization}.cc
422DEFINE_bool(testing_bool_flag, true, "testing_bool_flag")
423DEFINE_int(testing_int_flag, 13, "testing_int_flag")
424DEFINE_float(testing_float_flag, 2.5, "float-flag")
425DEFINE_string(testing_string_flag, "Hello, world!", "string-flag")
426DEFINE_int(testing_prng_seed, 42, "Seed used for threading test randomness")
427#ifdef WIN32
428DEFINE_string(testing_serialization_file, "C:\\Windows\\Temp\\serdes",
429              "file in which to testing_serialize heap")
430#else
431DEFINE_string(testing_serialization_file, "/tmp/serdes",
432              "file in which to serialize heap")
433#endif
434
435//
436// Dev shell flags
437//
438
439DEFINE_bool(help, false, "Print usage message, including flags, on console")
440DEFINE_bool(dump_counters, false, "Dump counters on exit")
441
442#ifdef ENABLE_DEBUGGER_SUPPORT
443DEFINE_bool(debugger, false, "Enable JavaScript debugger")
444DEFINE_bool(remote_debugger, false, "Connect JavaScript debugger to the "
445                                    "debugger agent in another process")
446DEFINE_bool(debugger_agent, false, "Enable debugger agent")
447DEFINE_int(debugger_port, 5858, "Port to use for remote debugging")
448#endif  // ENABLE_DEBUGGER_SUPPORT
449
450DEFINE_string(map_counters, "", "Map counters to a file")
451DEFINE_args(js_arguments, JSARGUMENTS_INIT,
452            "Pass all remaining arguments to the script. Alias for \"--\".")
453
454#if defined(WEBOS__)
455DEFINE_bool(debug_compile_events, false, "Enable debugger compile events")
456DEFINE_bool(debug_script_collected_events, false,
457            "Enable debugger script collected events")
458#else
459DEFINE_bool(debug_compile_events, true, "Enable debugger compile events")
460DEFINE_bool(debug_script_collected_events, true,
461            "Enable debugger script collected events")
462#endif
463
464
465//
466// GDB JIT integration flags.
467//
468
469DEFINE_bool(gdbjit, false, "enable GDBJIT interface (disables compacting GC)")
470DEFINE_bool(gdbjit_full, false, "enable GDBJIT interface for all code objects")
471DEFINE_bool(gdbjit_dump, false, "dump elf objects with debug info to disk")
472DEFINE_string(gdbjit_dump_filter, "",
473              "dump only objects containing this substring")
474
475// mark-compact.cc
476DEFINE_bool(force_marking_deque_overflows, false,
477            "force overflows of marking deque by reducing it's size "
478            "to 64 words")
479
480DEFINE_bool(stress_compaction, false,
481            "stress the GC compactor to flush out bugs (implies "
482            "--force_marking_deque_overflows)")
483
484//
485// Debug only flags
486//
487#undef FLAG
488#ifdef DEBUG
489#define FLAG FLAG_FULL
490#else
491#define FLAG FLAG_READONLY
492#endif
493
494// checks.cc
495DEFINE_bool(enable_slow_asserts, false,
496            "enable asserts that are slow to execute")
497
498// codegen-ia32.cc / codegen-arm.cc
499DEFINE_bool(trace_codegen, false,
500            "print name of functions for which code is generated")
501DEFINE_bool(print_source, false, "pretty print source code")
502DEFINE_bool(print_builtin_source, false,
503            "pretty print source code for builtins")
504DEFINE_bool(print_ast, false, "print source AST")
505DEFINE_bool(print_builtin_ast, false, "print source AST for builtins")
506DEFINE_string(stop_at, "", "function name where to insert a breakpoint")
507
508// compiler.cc
509DEFINE_bool(print_builtin_scopes, false, "print scopes for builtins")
510DEFINE_bool(print_scopes, false, "print scopes")
511
512// contexts.cc
513DEFINE_bool(trace_contexts, false, "trace contexts operations")
514
515// heap.cc
516DEFINE_bool(gc_greedy, false, "perform GC prior to some allocations")
517DEFINE_bool(gc_verbose, false, "print stuff during garbage collection")
518DEFINE_bool(heap_stats, false, "report heap statistics before and after GC")
519DEFINE_bool(code_stats, false, "report code statistics after GC")
520DEFINE_bool(verify_heap, false, "verify heap pointers before and after GC")
521DEFINE_bool(print_handles, false, "report handles after GC")
522DEFINE_bool(print_global_handles, false, "report global handles after GC")
523
524// ic.cc
525DEFINE_bool(trace_ic, false, "trace inline cache state transitions")
526
527// interface.cc
528DEFINE_bool(print_interfaces, false, "print interfaces")
529DEFINE_bool(print_interface_details, false, "print interface inference details")
530DEFINE_int(print_interface_depth, 5, "depth for printing interfaces")
531
532// objects.cc
533DEFINE_bool(trace_normalization,
534            false,
535            "prints when objects are turned into dictionaries.")
536
537// runtime.cc
538DEFINE_bool(trace_lazy, false, "trace lazy compilation")
539
540// spaces.cc
541DEFINE_bool(collect_heap_spill_statistics, false,
542            "report heap spill statistics along with heap_stats "
543            "(requires heap_stats)")
544
545DEFINE_bool(trace_isolates, false, "trace isolate state changes")
546
547// VM state
548DEFINE_bool(log_state_changes, false, "Log state changes.")
549
550// Regexp
551DEFINE_bool(regexp_possessive_quantifier,
552            false,
553            "enable possessive quantifier syntax for testing")
554DEFINE_bool(trace_regexp_bytecodes, false, "trace regexp bytecode execution")
555DEFINE_bool(trace_regexp_assembler,
556            false,
557            "trace regexp macro assembler calls.")
558
559//
560// Logging and profiling flags
561//
562#undef FLAG
563#define FLAG FLAG_FULL
564
565// log.cc
566DEFINE_bool(log, false,
567            "Minimal logging (no API, code, GC, suspect, or handles samples).")
568DEFINE_bool(log_all, false, "Log all events to the log file.")
569DEFINE_bool(log_runtime, false, "Activate runtime system %Log call.")
570DEFINE_bool(log_api, false, "Log API events to the log file.")
571DEFINE_bool(log_code, false,
572            "Log code events to the log file without profiling.")
573DEFINE_bool(log_gc, false,
574            "Log heap samples on garbage collection for the hp2ps tool.")
575DEFINE_bool(log_handles, false, "Log global handle events.")
576DEFINE_bool(log_snapshot_positions, false,
577            "log positions of (de)serialized objects in the snapshot.")
578DEFINE_bool(log_suspect, false, "Log suspect operations.")
579DEFINE_bool(prof, false,
580            "Log statistical profiling information (implies --log-code).")
581DEFINE_bool(prof_auto, true,
582            "Used with --prof, starts profiling automatically")
583DEFINE_bool(prof_lazy, false,
584            "Used with --prof, only does sampling and logging"
585            " when profiler is active (implies --noprof_auto).")
586DEFINE_bool(prof_browser_mode, true,
587            "Used with --prof, turns on browser-compatible mode for profiling.")
588DEFINE_bool(log_regexp, false, "Log regular expression execution.")
589DEFINE_bool(sliding_state_window, false,
590            "Update sliding state window counters.")
591DEFINE_string(logfile, "v8.log", "Specify the name of the log file.")
592DEFINE_bool(ll_prof, false, "Enable low-level linux profiler.")
593
594//
595// Disassembler only flags
596//
597#undef FLAG
598#ifdef ENABLE_DISASSEMBLER
599#define FLAG FLAG_FULL
600#else
601#define FLAG FLAG_READONLY
602#endif
603
604// elements.cc
605DEFINE_bool(trace_elements_transitions, false, "trace elements transitions")
606
607// code-stubs.cc
608DEFINE_bool(print_code_stubs, false, "print code stubs")
609DEFINE_bool(test_secondary_stub_cache,
610            false,
611            "test secondary stub cache by disabling the primary one")
612
613DEFINE_bool(test_primary_stub_cache,
614            false,
615            "test primary stub cache by disabling the secondary one")
616
617// codegen-ia32.cc / codegen-arm.cc
618DEFINE_bool(print_code, false, "print generated code")
619DEFINE_bool(print_opt_code, false, "print optimized code")
620DEFINE_bool(print_unopt_code, false, "print unoptimized code before "
621            "printing optimized code based on it")
622DEFINE_bool(print_code_verbose, false, "print more information for code")
623DEFINE_bool(print_builtin_code, false, "print generated code for builtins")
624
625#ifdef ENABLE_DISASSEMBLER
626DEFINE_bool(print_all_code, false, "enable all flags related to printing code")
627DEFINE_implication(print_all_code, print_code)
628DEFINE_implication(print_all_code, print_opt_code)
629DEFINE_implication(print_all_code, print_unopt_code)
630DEFINE_implication(print_all_code, print_code_verbose)
631DEFINE_implication(print_all_code, print_builtin_code)
632DEFINE_implication(print_all_code, print_code_stubs)
633DEFINE_implication(print_all_code, code_comments)
634#ifdef DEBUG
635DEFINE_implication(print_all_code, trace_codegen)
636#endif
637#endif
638
639// Cleanup...
640#undef FLAG_FULL
641#undef FLAG_READONLY
642#undef FLAG
643
644#undef DEFINE_bool
645#undef DEFINE_int
646#undef DEFINE_string
647#undef DEFINE_implication
648
649#undef FLAG_MODE_DECLARE
650#undef FLAG_MODE_DEFINE
651#undef FLAG_MODE_DEFINE_DEFAULTS
652#undef FLAG_MODE_META
653#undef FLAG_MODE_DEFINE_IMPLICATIONS
654