diff options
| author | Michaël Zasso <targos@protonmail.com> | 2019-08-01 08:38:30 +0200 |
|---|---|---|
| committer | Michaël Zasso <targos@protonmail.com> | 2019-08-01 12:53:56 +0200 |
| commit | 2dcc3665abf57c3607cebffdeeca062f5894885d (patch) | |
| tree | 4f560748132edcfb4c22d6f967a7e80d23d7ea2c /deps/v8/src/flags | |
| parent | 1ee47d550c6de132f06110aa13eceb7551d643b3 (diff) | |
| download | android-node-v8-2dcc3665abf57c3607cebffdeeca062f5894885d.tar.gz android-node-v8-2dcc3665abf57c3607cebffdeeca062f5894885d.tar.bz2 android-node-v8-2dcc3665abf57c3607cebffdeeca062f5894885d.zip | |
deps: update V8 to 7.6.303.28
PR-URL: https://github.com/nodejs/node/pull/28016
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann (רפאל פלחי) <refack@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Diffstat (limited to 'deps/v8/src/flags')
| -rw-r--r-- | deps/v8/src/flags/flag-definitions.h | 1558 | ||||
| -rw-r--r-- | deps/v8/src/flags/flags.cc | 636 | ||||
| -rw-r--r-- | deps/v8/src/flags/flags.h | 71 |
3 files changed, 2265 insertions, 0 deletions
diff --git a/deps/v8/src/flags/flag-definitions.h b/deps/v8/src/flags/flag-definitions.h new file mode 100644 index 0000000000..0ef23def1e --- /dev/null +++ b/deps/v8/src/flags/flag-definitions.h @@ -0,0 +1,1558 @@ +// Copyright 2012 the V8 project authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +// This file defines all of the flags. It is separated into different section, +// for Debug, Release, Logging and Profiling, etc. To add a new flag, find the +// correct section, and use one of the DEFINE_ macros, without a trailing ';'. +// +// This include does not have a guard, because it is a template-style include, +// which can be included multiple times in different modes. It expects to have +// a mode defined before it's included. The modes are FLAG_MODE_... below: +// +// PRESUBMIT_INTENTIONALLY_MISSING_INCLUDE_GUARD + +#define DEFINE_IMPLICATION(whenflag, thenflag) \ + DEFINE_VALUE_IMPLICATION(whenflag, thenflag, true) + +#define DEFINE_NEG_IMPLICATION(whenflag, thenflag) \ + DEFINE_VALUE_IMPLICATION(whenflag, thenflag, false) + +#define DEFINE_NEG_NEG_IMPLICATION(whenflag, thenflag) \ + DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, false) + +// We want to declare the names of the variables for the header file. Normally +// this will just be an extern declaration, but for a readonly flag we let the +// compiler make better optimizations by giving it the value. +#if defined(FLAG_MODE_DECLARE) +#define FLAG_FULL(ftype, ctype, nam, def, cmt) \ + V8_EXPORT_PRIVATE extern ctype FLAG_##nam; +#define FLAG_READONLY(ftype, ctype, nam, def, cmt) \ + static constexpr ctype FLAG_##nam = def; + +// We want to supply the actual storage and value for the flag variable in the +// .cc file. We only do this for writable flags. +#elif defined(FLAG_MODE_DEFINE) +#ifdef USING_V8_SHARED +#define FLAG_FULL(ftype, ctype, nam, def, cmt) \ + V8_EXPORT_PRIVATE extern ctype FLAG_##nam; +#else +#define FLAG_FULL(ftype, ctype, nam, def, cmt) \ + V8_EXPORT_PRIVATE ctype FLAG_##nam = def; +#endif + +// We need to define all of our default values so that the Flag structure can +// access them by pointer. These are just used internally inside of one .cc, +// for MODE_META, so there is no impact on the flags interface. +#elif defined(FLAG_MODE_DEFINE_DEFAULTS) +#define FLAG_FULL(ftype, ctype, nam, def, cmt) \ + static constexpr ctype FLAGDEFAULT_##nam = def; + +// We want to write entries into our meta data table, for internal parsing and +// printing / etc in the flag parser code. We only do this for writable flags. +#elif defined(FLAG_MODE_META) +#define FLAG_FULL(ftype, ctype, nam, def, cmt) \ + {Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false}, +#define FLAG_ALIAS(ftype, ctype, alias, nam) \ + {Flag::TYPE_##ftype, #alias, &FLAG_##nam, &FLAGDEFAULT_##nam, \ + "alias for --" #nam, false}, + +// We produce the code to set flags when it is implied by another flag. +#elif defined(FLAG_MODE_DEFINE_IMPLICATIONS) +#define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value) \ + if (FLAG_##whenflag) FLAG_##thenflag = value; + +#define DEFINE_GENERIC_IMPLICATION(whenflag, statement) \ + if (FLAG_##whenflag) statement; + +#define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value) \ + if (!FLAG_##whenflag) FLAG_##thenflag = value; + +// We apply a generic macro to the flags. +#elif defined(FLAG_MODE_APPLY) + +#define FLAG_FULL FLAG_MODE_APPLY + +#else +#error No mode supplied when including flags.defs +#endif + +// Dummy defines for modes where it is not relevant. +#ifndef FLAG_FULL +#define FLAG_FULL(ftype, ctype, nam, def, cmt) +#endif + +#ifndef FLAG_READONLY +#define FLAG_READONLY(ftype, ctype, nam, def, cmt) +#endif + +#ifndef FLAG_ALIAS +#define FLAG_ALIAS(ftype, ctype, alias, nam) +#endif + +#ifndef DEFINE_VALUE_IMPLICATION +#define DEFINE_VALUE_IMPLICATION(whenflag, thenflag, value) +#endif + +#ifndef DEFINE_GENERIC_IMPLICATION +#define DEFINE_GENERIC_IMPLICATION(whenflag, statement) +#endif + +#ifndef DEFINE_NEG_VALUE_IMPLICATION +#define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value) +#endif + +#define COMMA , + +#ifdef FLAG_MODE_DECLARE + +struct MaybeBoolFlag { + static MaybeBoolFlag Create(bool has_value, bool value) { + MaybeBoolFlag flag; + flag.has_value = has_value; + flag.value = value; + return flag; + } + bool has_value; + bool value; + + bool operator!=(const MaybeBoolFlag& other) const { + return has_value != other.has_value || value != other.value; + } +}; +#endif + +#ifdef DEBUG +#define DEBUG_BOOL true +#else +#define DEBUG_BOOL false +#endif + +#ifdef V8_COMPRESS_POINTERS +#define COMPRESS_POINTERS_BOOL true +#else +#define COMPRESS_POINTERS_BOOL false +#endif + +// Supported ARM configurations are: +// "armv6": ARMv6 + VFPv2 +// "armv7": ARMv7 + VFPv3-D32 + NEON +// "armv7+sudiv": ARMv7 + VFPv4-D32 + NEON + SUDIV +// "armv8": ARMv8 (including all of the above) +#if !defined(ARM_TEST_NO_FEATURE_PROBE) || \ + (defined(CAN_USE_ARMV8_INSTRUCTIONS) && \ + defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_SUDIV) && \ + defined(CAN_USE_NEON) && defined(CAN_USE_VFP3_INSTRUCTIONS)) +#define ARM_ARCH_DEFAULT "armv8" +#elif defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_SUDIV) && \ + defined(CAN_USE_NEON) && defined(CAN_USE_VFP3_INSTRUCTIONS) +#define ARM_ARCH_DEFAULT "armv7+sudiv" +#elif defined(CAN_USE_ARMV7_INSTRUCTIONS) && defined(CAN_USE_NEON) && \ + defined(CAN_USE_VFP3_INSTRUCTIONS) +#define ARM_ARCH_DEFAULT "armv7" +#else +#define ARM_ARCH_DEFAULT "armv6" +#endif + +#ifdef V8_OS_WIN +#define ENABLE_LOG_COLOUR false +#else +#define ENABLE_LOG_COLOUR true +#endif + +#define DEFINE_BOOL(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt) +#define DEFINE_BOOL_READONLY(nam, def, cmt) \ + FLAG_READONLY(BOOL, bool, nam, def, cmt) +#define DEFINE_MAYBE_BOOL(nam, cmt) \ + FLAG(MAYBE_BOOL, MaybeBoolFlag, nam, {false COMMA false}, cmt) +#define DEFINE_INT(nam, def, cmt) FLAG(INT, int, nam, def, cmt) +#define DEFINE_UINT(nam, def, cmt) FLAG(UINT, unsigned int, nam, def, cmt) +#define DEFINE_UINT64(nam, def, cmt) FLAG(UINT64, uint64_t, nam, def, cmt) +#define DEFINE_FLOAT(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt) +#define DEFINE_SIZE_T(nam, def, cmt) FLAG(SIZE_T, size_t, nam, def, cmt) +#define DEFINE_STRING(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt) +#define DEFINE_ALIAS_BOOL(alias, nam) FLAG_ALIAS(BOOL, bool, alias, nam) +#define DEFINE_ALIAS_INT(alias, nam) FLAG_ALIAS(INT, int, alias, nam) +#define DEFINE_ALIAS_FLOAT(alias, nam) FLAG_ALIAS(FLOAT, double, alias, nam) +#define DEFINE_ALIAS_SIZE_T(alias, nam) FLAG_ALIAS(SIZE_T, size_t, alias, nam) +#define DEFINE_ALIAS_STRING(alias, nam) \ + FLAG_ALIAS(STRING, const char*, alias, nam) + +#ifdef DEBUG +#define DEFINE_DEBUG_BOOL DEFINE_BOOL +#else +#define DEFINE_DEBUG_BOOL DEFINE_BOOL_READONLY +#endif + +// +// Flags in all modes. +// +#define FLAG FLAG_FULL + +// Flags for language modes and experimental language features. +DEFINE_BOOL(use_strict, false, "enforce strict mode") + +DEFINE_BOOL(es_staging, false, + "enable test-worthy harmony features (for internal use only)") +DEFINE_BOOL(harmony, false, "enable all completed harmony features") +DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features") +DEFINE_IMPLICATION(es_staging, harmony) +// Enabling import.meta requires to also enable import() +DEFINE_IMPLICATION(harmony_import_meta, harmony_dynamic_import) + +// Update bootstrapper.cc whenever adding a new feature flag. + +// Features that are still work in progress (behind individual flags). +#define HARMONY_INPROGRESS_BASE(V) \ + V(harmony_private_methods, "harmony private methods in class literals") \ + V(harmony_regexp_sequence, "RegExp Unicode sequence properties") \ + V(harmony_weak_refs, "harmony weak references") + +#ifdef V8_INTL_SUPPORT +#define HARMONY_INPROGRESS(V) HARMONY_INPROGRESS_BASE(V) +#else +#define HARMONY_INPROGRESS(V) HARMONY_INPROGRESS_BASE(V) +#endif + +// Features that are complete (but still behind --harmony/es-staging flag). +#define HARMONY_STAGED_BASE(V) + +#ifdef V8_INTL_SUPPORT +#define HARMONY_STAGED(V) \ + HARMONY_STAGED_BASE(V) \ + V(harmony_intl_add_calendar_numbering_system, \ + "Add calendar and numberingSystem to DateTimeFormat") \ + V(harmony_intl_numberformat_unified, "Unified Intl.NumberFormat Features") \ + V(harmony_intl_segmenter, "Intl.Segmenter") +#else +#define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V) +#endif + +// Features that are shipping (turned on by default, but internal flag remains). +#define HARMONY_SHIPPING_BASE(V) \ + V(harmony_namespace_exports, \ + "harmony namespace exports (export * as foo from 'bar')") \ + V(harmony_sharedarraybuffer, "harmony sharedarraybuffer") \ + V(harmony_import_meta, "harmony import.meta property") \ + V(harmony_dynamic_import, "harmony dynamic import") \ + V(harmony_global, "harmony global") \ + V(harmony_object_from_entries, "harmony Object.fromEntries()") \ + V(harmony_hashbang, "harmony hashbang syntax") \ + V(harmony_numeric_separator, "harmony numeric separator between digits") \ + V(harmony_promise_all_settled, "harmony Promise.allSettled") + +#ifdef V8_INTL_SUPPORT +#define HARMONY_SHIPPING(V) \ + HARMONY_SHIPPING_BASE(V) \ + V(harmony_intl_bigint, "BigInt.prototype.toLocaleString") \ + V(harmony_intl_date_format_range, "DateTimeFormat formatRange") \ + V(harmony_intl_datetime_style, "dateStyle timeStyle for DateTimeFormat") +#else +#define HARMONY_SHIPPING(V) HARMONY_SHIPPING_BASE(V) +#endif + +// Once a shipping feature has proved stable in the wild, it will be dropped +// from HARMONY_SHIPPING, all occurrences of the FLAG_ variable are removed, +// and associated tests are moved from the harmony directory to the appropriate +// esN directory. + +#define FLAG_INPROGRESS_FEATURES(id, description) \ + DEFINE_BOOL(id, false, "enable " #description " (in progress)") +HARMONY_INPROGRESS(FLAG_INPROGRESS_FEATURES) +#undef FLAG_INPROGRESS_FEATURES + +#define FLAG_STAGED_FEATURES(id, description) \ + DEFINE_BOOL(id, false, "enable " #description) \ + DEFINE_IMPLICATION(harmony, id) +HARMONY_STAGED(FLAG_STAGED_FEATURES) +#undef FLAG_STAGED_FEATURES + +#define FLAG_SHIPPING_FEATURES(id, description) \ + DEFINE_BOOL(id, true, "enable " #description) \ + DEFINE_NEG_NEG_IMPLICATION(harmony_shipping, id) +HARMONY_SHIPPING(FLAG_SHIPPING_FEATURES) +#undef FLAG_SHIPPING_FEATURES + +#ifdef V8_INTL_SUPPORT +DEFINE_BOOL(icu_timezone_data, true, "get information about timezones from ICU") +#endif + +#ifdef V8_ENABLE_RAW_HEAP_SNAPSHOTS +#define V8_ENABLE_RAW_HEAP_SNAPSHOTS_BOOL true +#else +#define V8_ENABLE_RAW_HEAP_SNAPSHOTS_BOOL false +#endif // V8_ENABLE_RAW_HEAP_SNAPSHOTS + +#ifdef V8_LITE_MODE +#define V8_LITE_BOOL true +#else +#define V8_LITE_BOOL false +#endif + +DEFINE_BOOL(lite_mode, V8_LITE_BOOL, + "enables trade-off of performance for memory savings") + +// Lite mode implies other flags to trade-off performance for memory. +DEFINE_IMPLICATION(lite_mode, jitless) +DEFINE_IMPLICATION(lite_mode, lazy_feedback_allocation) +DEFINE_IMPLICATION(lite_mode, enable_lazy_source_positions) +DEFINE_IMPLICATION(lite_mode, optimize_for_size) + +#ifdef V8_ENABLE_FUTURE +#define FUTURE_BOOL true +#else +#define FUTURE_BOOL false +#endif +DEFINE_BOOL(future, FUTURE_BOOL, + "Implies all staged features that we want to ship in the " + "not-too-far future") + +DEFINE_IMPLICATION(future, write_protect_code_memory) + +// Flags for experimental implementation features. +DEFINE_BOOL(allocation_site_pretenuring, true, + "pretenure with allocation sites") +DEFINE_BOOL(page_promotion, true, "promote pages based on utilization") +DEFINE_INT(page_promotion_threshold, 70, + "min percentage of live bytes on a page to enable fast evacuation") +DEFINE_BOOL(trace_pretenuring, false, + "trace pretenuring decisions of HAllocate instructions") +DEFINE_BOOL(trace_pretenuring_statistics, false, + "trace allocation site pretenuring statistics") +DEFINE_BOOL(track_fields, true, "track fields with only smi values") +DEFINE_BOOL(track_double_fields, true, "track fields with double values") +DEFINE_BOOL(track_heap_object_fields, true, "track fields with heap values") +DEFINE_BOOL(track_computed_fields, true, "track computed boilerplate fields") +DEFINE_IMPLICATION(track_double_fields, track_fields) +DEFINE_IMPLICATION(track_heap_object_fields, track_fields) +DEFINE_IMPLICATION(track_computed_fields, track_fields) +DEFINE_BOOL(track_field_types, true, "track field types") +DEFINE_IMPLICATION(track_field_types, track_fields) +DEFINE_IMPLICATION(track_field_types, track_heap_object_fields) +DEFINE_BOOL(trace_block_coverage, false, + "trace collected block coverage information") +DEFINE_BOOL(feedback_normalization, false, + "feed back normalization to constructors") +// TODO(jkummerow): This currently adds too much load on the stub cache. +DEFINE_BOOL_READONLY(internalize_on_the_fly, true, + "internalize string keys for generic keyed ICs on the fly") + +// Flag to faster calls with arguments mismatches (https://crbug.com/v8/8895) +DEFINE_BOOL(fast_calls_with_arguments_mismatches, true, + "skip arguments adaptor frames when it's provably safe") + +// Flag for one shot optimiztions. +DEFINE_BOOL(enable_one_shot_optimization, true, + "Enable size optimizations for the code that will " + "only be executed once") + +// Flag for sealed, frozen elements kind instead of dictionary elements kind +DEFINE_BOOL_READONLY(enable_sealed_frozen_elements_kind, true, + "Enable sealed, frozen elements kind") + +// Flags for data representation optimizations +DEFINE_BOOL(unbox_double_arrays, true, "automatically unbox arrays of doubles") +DEFINE_BOOL_READONLY(string_slices, true, "use string slices") + +DEFINE_INT(interrupt_budget, 144 * KB, + "interrupt budget which should be used for the profiler counter") + +// Flags for jitless +DEFINE_BOOL(jitless, V8_LITE_BOOL, + "Disable runtime allocation of executable memory.") + +// Jitless V8 has a few implications: +DEFINE_NEG_IMPLICATION(jitless, opt) +// Field representation tracking is only used by TurboFan. +DEFINE_NEG_IMPLICATION(jitless, track_field_types) +DEFINE_NEG_IMPLICATION(jitless, track_heap_object_fields) +// Regexps are interpreted. +DEFINE_IMPLICATION(jitless, regexp_interpret_all) +// asm.js validation is disabled since it triggers wasm code generation. +DEFINE_NEG_IMPLICATION(jitless, validate_asm) +// Wasm is put into interpreter-only mode. We repeat flag implications down +// here to ensure they're applied correctly by setting the --jitless flag. +DEFINE_IMPLICATION(jitless, wasm_interpret_all) +DEFINE_NEG_IMPLICATION(jitless, asm_wasm_lazy_compilation) +DEFINE_NEG_IMPLICATION(jitless, wasm_lazy_compilation) +// --jitless also implies --no-expose-wasm, see InitializeOncePerProcessImpl. + +// Flags for inline caching and feedback vectors. +DEFINE_BOOL(use_ic, true, "use inline caching") +DEFINE_INT(budget_for_feedback_vector_allocation, 1 * KB, + "The budget in amount of bytecode executed by a function before we " + "decide to allocate feedback vectors") +DEFINE_BOOL(lazy_feedback_allocation, false, "Allocate feedback vectors lazily") +DEFINE_IMPLICATION(future, lazy_feedback_allocation) + +// Flags for Ignition. +DEFINE_BOOL(ignition_elide_noneffectful_bytecodes, true, + "elide bytecodes which won't have any external effect") +DEFINE_BOOL(ignition_reo, true, "use ignition register equivalence optimizer") +DEFINE_BOOL(ignition_filter_expression_positions, true, + "filter expression positions before the bytecode pipeline") +DEFINE_BOOL(ignition_share_named_property_feedback, true, + "share feedback slots when loading the same named property from " + "the same object") +DEFINE_BOOL(print_bytecode, false, + "print bytecode generated by ignition interpreter") +DEFINE_BOOL(enable_lazy_source_positions, false, + "skip generating source positions during initial compile but " + "regenerate when actually required") +DEFINE_STRING(print_bytecode_filter, "*", + "filter for selecting which functions to print bytecode") +#ifdef V8_TRACE_IGNITION +DEFINE_BOOL(trace_ignition, false, + "trace the bytecodes executed by the ignition interpreter") +#endif +#ifdef V8_TRACE_FEEDBACK_UPDATES +DEFINE_BOOL( + trace_feedback_updates, false, + "trace updates to feedback vectors during ignition interpreter execution.") +#endif +DEFINE_BOOL(trace_ignition_codegen, false, + "trace the codegen of ignition interpreter bytecode handlers") +DEFINE_BOOL(trace_ignition_dispatches, false, + "traces the dispatches to bytecode handlers by the ignition " + "interpreter") +DEFINE_STRING(trace_ignition_dispatches_output_file, nullptr, + "the file to which the bytecode handler dispatch table is " + "written (by default, the table is not written to a file)") + +DEFINE_BOOL(fast_math, true, "faster (but maybe less accurate) math functions") +DEFINE_BOOL(trace_track_allocation_sites, false, + "trace the tracking of allocation sites") +DEFINE_BOOL(trace_migration, false, "trace object migration") +DEFINE_BOOL(trace_generalization, false, "trace map generalization") + +// Flags for concurrent recompilation. +DEFINE_BOOL(concurrent_recompilation, true, + "optimizing hot functions asynchronously on a separate thread") +DEFINE_BOOL(trace_concurrent_recompilation, false, + "track concurrent recompilation") +DEFINE_INT(concurrent_recompilation_queue_length, 8, + "the length of the concurrent compilation queue") +DEFINE_INT(concurrent_recompilation_delay, 0, + "artificial compilation delay in ms") +DEFINE_BOOL(block_concurrent_recompilation, false, + "block queued jobs until released") +DEFINE_BOOL(concurrent_inlining, false, + "run optimizing compiler's inlining phase on a separate thread") +DEFINE_IMPLICATION(future, concurrent_inlining) +DEFINE_BOOL(trace_heap_broker_verbose, false, + "trace the heap broker verbosely (all reports)") +DEFINE_BOOL(trace_heap_broker, false, + "trace the heap broker (reports on missing data only)") +DEFINE_IMPLICATION(trace_heap_broker_verbose, trace_heap_broker) + +// Flags for stress-testing the compiler. +DEFINE_INT(stress_runs, 0, "number of stress runs") +DEFINE_INT(deopt_every_n_times, 0, + "deoptimize every n times a deopt point is passed") +DEFINE_BOOL(print_deopt_stress, false, "print number of possible deopt points") + +// Flags for TurboFan. +DEFINE_BOOL(opt, true, "use adaptive optimizations") +DEFINE_BOOL(turbo_sp_frame_access, false, + "use stack pointer-relative access to frame wherever possible") +DEFINE_BOOL(turbo_control_flow_aware_allocation, false, + "consider control flow while allocating registers") + +DEFINE_STRING(turbo_filter, "*", "optimization filter for TurboFan compiler") +DEFINE_BOOL(trace_turbo, false, "trace generated TurboFan IR") +DEFINE_STRING(trace_turbo_path, nullptr, + "directory to dump generated TurboFan IR to") +DEFINE_STRING(trace_turbo_filter, "*", + "filter for tracing turbofan compilation") +DEFINE_BOOL(trace_turbo_graph, false, "trace generated TurboFan graphs") +DEFINE_BOOL(trace_turbo_scheduled, false, "trace TurboFan IR with schedule") +DEFINE_IMPLICATION(trace_turbo_scheduled, trace_turbo_graph) +DEFINE_STRING(trace_turbo_cfg_file, nullptr, + "trace turbo cfg graph (for C1 visualizer) to a given file name") +DEFINE_BOOL(trace_turbo_types, true, "trace TurboFan's types") +DEFINE_BOOL(trace_turbo_scheduler, false, "trace TurboFan's scheduler") +DEFINE_BOOL(trace_turbo_reduction, false, "trace TurboFan's various reducers") +DEFINE_BOOL(trace_turbo_trimming, false, "trace TurboFan's graph trimmer") +DEFINE_BOOL(trace_turbo_jt, false, "trace TurboFan's jump threading") +DEFINE_BOOL(trace_turbo_ceq, false, "trace TurboFan's control equivalence") +DEFINE_BOOL(trace_turbo_loop, false, "trace TurboFan's loop optimizations") +DEFINE_BOOL(trace_alloc, false, "trace register allocator") +DEFINE_BOOL(trace_all_uses, false, "trace all use positions") +DEFINE_BOOL(trace_representation, false, "trace representation types") +DEFINE_BOOL(turbo_verify, DEBUG_BOOL, "verify TurboFan graphs at each phase") +DEFINE_STRING(turbo_verify_machine_graph, nullptr, + "verify TurboFan machine graph before instruction selection") +#ifdef ENABLE_VERIFY_CSA +DEFINE_BOOL(verify_csa, DEBUG_BOOL, + "verify TurboFan machine graph of code stubs") +#else +// Define the flag as read-only-false so that code still compiles even in the +// non-ENABLE_VERIFY_CSA configuration. +DEFINE_BOOL_READONLY(verify_csa, false, + "verify TurboFan machine graph of code stubs") +#endif +DEFINE_BOOL(trace_verify_csa, false, "trace code stubs verification") +DEFINE_STRING(csa_trap_on_node, nullptr, + "trigger break point when a node with given id is created in " + "given stub. The format is: StubName,NodeId") +DEFINE_BOOL_READONLY(fixed_array_bounds_checks, true, + "enable FixedArray bounds checks") +DEFINE_BOOL(turbo_stats, false, "print TurboFan statistics") +DEFINE_BOOL(turbo_stats_nvp, false, + "print TurboFan statistics in machine-readable format") +DEFINE_BOOL(turbo_stats_wasm, false, + "print TurboFan statistics of wasm compilations") +DEFINE_BOOL(turbo_splitting, true, "split nodes during scheduling in TurboFan") +DEFINE_BOOL(function_context_specialization, false, + "enable function context specialization in TurboFan") +DEFINE_BOOL(turbo_inlining, true, "enable inlining in TurboFan") +DEFINE_INT(max_inlined_bytecode_size, 500, + "maximum size of bytecode for a single inlining") +DEFINE_INT(max_inlined_bytecode_size_cumulative, 1000, + "maximum cumulative size of bytecode considered for inlining") +DEFINE_INT(max_inlined_bytecode_size_absolute, 5000, + "maximum cumulative size of bytecode considered for inlining") +DEFINE_FLOAT(reserve_inline_budget_scale_factor, 1.2, + "maximum cumulative size of bytecode considered for inlining") +DEFINE_INT(max_inlined_bytecode_size_small, 30, + "maximum size of bytecode considered for small function inlining") +DEFINE_INT(max_optimized_bytecode_size, 60 * KB, + "maximum bytecode size to " + "be considered for optimization; too high values may cause " + "the compiler to hit (release) assertions") +DEFINE_FLOAT(min_inlining_frequency, 0.15, "minimum frequency for inlining") +DEFINE_BOOL(polymorphic_inlining, true, "polymorphic inlining") +DEFINE_BOOL(stress_inline, false, + "set high thresholds for inlining to inline as much as possible") +DEFINE_VALUE_IMPLICATION(stress_inline, max_inlined_bytecode_size, 999999) +DEFINE_VALUE_IMPLICATION(stress_inline, max_inlined_bytecode_size_cumulative, + 999999) +DEFINE_VALUE_IMPLICATION(stress_inline, max_inlined_bytecode_size_absolute, + 999999) +DEFINE_VALUE_IMPLICATION(stress_inline, min_inlining_frequency, 0) +DEFINE_VALUE_IMPLICATION(stress_inline, polymorphic_inlining, true) +DEFINE_BOOL(trace_turbo_inlining, false, "trace TurboFan inlining") +DEFINE_BOOL(inline_accessors, true, "inline JavaScript accessors") +DEFINE_BOOL(turbo_inline_array_builtins, true, + "inline array builtins in TurboFan code") +DEFINE_BOOL(use_osr, true, "use on-stack replacement") +DEFINE_BOOL(trace_osr, false, "trace on-stack replacement") +DEFINE_BOOL(analyze_environment_liveness, true, + "analyze liveness of environment slots and zap dead values") +DEFINE_BOOL(trace_environment_liveness, false, + "trace liveness of local variable slots") +DEFINE_BOOL(turbo_load_elimination, true, "enable load elimination in TurboFan") +DEFINE_BOOL(trace_turbo_load_elimination, false, + "trace TurboFan load elimination") +DEFINE_BOOL(turbo_profiling, false, "enable profiling in TurboFan") +DEFINE_BOOL(turbo_verify_allocation, DEBUG_BOOL, + "verify register allocation in TurboFan") +DEFINE_BOOL(turbo_move_optimization, true, "optimize gap moves in TurboFan") +DEFINE_BOOL(turbo_jt, true, "enable jump threading in TurboFan") +DEFINE_BOOL(turbo_loop_peeling, true, "Turbofan loop peeling") +DEFINE_BOOL(turbo_loop_variable, true, "Turbofan loop variable optimization") +DEFINE_BOOL(turbo_loop_rotation, true, "Turbofan loop rotation") +DEFINE_BOOL(turbo_cf_optimization, true, "optimize control flow in TurboFan") +DEFINE_BOOL(turbo_escape, true, "enable escape analysis") +DEFINE_BOOL(turbo_allocation_folding, true, "Turbofan allocation folding") +DEFINE_BOOL(turbo_instruction_scheduling, false, + "enable instruction scheduling in TurboFan") +DEFINE_BOOL(turbo_stress_instruction_scheduling, false, + "randomly schedule instructions to stress dependency tracking") +DEFINE_BOOL(turbo_store_elimination, true, + "enable store-store elimination in TurboFan") +DEFINE_BOOL(trace_store_elimination, false, "trace store elimination") +DEFINE_BOOL(turbo_rewrite_far_jumps, true, + "rewrite far to near jumps (ia32,x64)") +DEFINE_BOOL(experimental_inline_promise_constructor, true, + "inline the Promise constructor in TurboFan") +DEFINE_BOOL( + stress_gc_during_compilation, false, + "simulate GC/compiler thread race related to https://crbug.com/v8/8520") + +// Favor memory over execution speed. +DEFINE_BOOL(optimize_for_size, false, + "Enables optimizations which favor memory size over execution " + "speed") +DEFINE_VALUE_IMPLICATION(optimize_for_size, max_semi_space_size, 1) + +#ifdef DISABLE_UNTRUSTED_CODE_MITIGATIONS +#define V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS false +#else +#define V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS true +#endif +DEFINE_BOOL(untrusted_code_mitigations, V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS, + "Enable mitigations for executing untrusted code") +#undef V8_DEFAULT_UNTRUSTED_CODE_MITIGATIONS + +// Flags for native WebAssembly. +DEFINE_BOOL(expose_wasm, true, "expose wasm interface to JavaScript") +DEFINE_BOOL(assume_asmjs_origin, false, + "force wasm decoder to assume input is internal asm-wasm format") +DEFINE_BOOL(wasm_disable_structured_cloning, false, + "disable wasm structured cloning") +DEFINE_INT(wasm_num_compilation_tasks, 10, + "number of parallel compilation tasks for wasm") +DEFINE_DEBUG_BOOL(trace_wasm_native_heap, false, + "trace wasm native heap events") +DEFINE_BOOL(wasm_write_protect_code_memory, false, + "write protect code memory on the wasm native heap") +DEFINE_BOOL(trace_wasm_serialization, false, + "trace serialization/deserialization") +DEFINE_BOOL(wasm_async_compilation, true, + "enable actual asynchronous compilation for WebAssembly.compile") +DEFINE_BOOL(wasm_test_streaming, false, + "use streaming compilation instead of async compilation for tests") +DEFINE_UINT(wasm_max_mem_pages, v8::internal::wasm::kV8MaxWasmMemoryPages, + "maximum number of 64KiB memory pages of a wasm instance") +DEFINE_UINT(wasm_max_table_size, v8::internal::wasm::kV8MaxWasmTableSize, + "maximum table size of a wasm instance") +DEFINE_UINT(wasm_max_code_space, v8::internal::kMaxWasmCodeMB, + "maximum committed code space for wasm (in MB)") +// Enable Liftoff by default on ia32 and x64. More architectures will follow +// once they are implemented and sufficiently tested. +#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64 +DEFINE_BOOL( + wasm_tier_up, true, + "enable wasm baseline compilation and tier up to the optimizing compiler") +#else +DEFINE_BOOL( + wasm_tier_up, false, + "enable wasm baseline compilation and tier up to the optimizing compiler") +DEFINE_IMPLICATION(future, wasm_tier_up) +#endif +DEFINE_IMPLICATION(wasm_tier_up, liftoff) +DEFINE_DEBUG_BOOL(trace_wasm_decoder, false, "trace decoding of wasm code") +DEFINE_DEBUG_BOOL(trace_wasm_compiler, false, "trace compiling of wasm code") +DEFINE_DEBUG_BOOL(trace_wasm_interpreter, false, + "trace interpretation of wasm code") +DEFINE_DEBUG_BOOL(trace_wasm_streaming, false, + "trace streaming compilation of wasm code") +DEFINE_INT(trace_wasm_ast_start, 0, + "start function for wasm AST trace (inclusive)") +DEFINE_INT(trace_wasm_ast_end, 0, "end function for wasm AST trace (exclusive)") +DEFINE_BOOL(liftoff, false, + "enable Liftoff, the baseline compiler for WebAssembly") +DEFINE_DEBUG_BOOL(trace_liftoff, false, + "trace Liftoff, the baseline compiler for WebAssembly") +DEFINE_DEBUG_BOOL(wasm_break_on_decoder_error, false, + "debug break when wasm decoder encounters an error") +DEFINE_BOOL(trace_wasm_memory, false, + "print all memory updates performed in wasm code") +// Fuzzers use {wasm_tier_mask_for_testing} together with {liftoff} and +// {no_wasm_tier_up} to force some functions to be compiled with Turbofan. +DEFINE_INT(wasm_tier_mask_for_testing, 0, + "bitmask of functions to compile with TurboFan instead of Liftoff") + +DEFINE_BOOL(validate_asm, true, "validate asm.js modules before compiling") +DEFINE_BOOL(suppress_asm_messages, false, + "don't emit asm.js related messages (for golden file testing)") +DEFINE_BOOL(trace_asm_time, false, "log asm.js timing info to the console") +DEFINE_BOOL(trace_asm_scanner, false, + "log tokens encountered by asm.js scanner") +DEFINE_BOOL(trace_asm_parser, false, "verbose logging of asm.js parse failures") +DEFINE_BOOL(stress_validate_asm, false, "try to validate everything as asm.js") + +DEFINE_DEBUG_BOOL(dump_wasm_module, false, "dump wasm module bytes") +DEFINE_STRING(dump_wasm_module_path, nullptr, + "directory to dump wasm modules to") + +// Declare command-line flags for WASM features. Warning: avoid using these +// flags directly in the implementation. Instead accept wasm::WasmFeatures +// for configurability. +#include "src/wasm/wasm-feature-flags.h" + +#define SPACE +#define DECL_WASM_FLAG(feat, desc, val) \ + DEFINE_BOOL(experimental_wasm_##feat, val, \ + "enable prototype " desc " for wasm") +FOREACH_WASM_FEATURE_FLAG(DECL_WASM_FLAG, SPACE) +#undef DECL_WASM_FLAG +#undef SPACE + +DEFINE_BOOL(wasm_opt, false, "enable wasm optimization") +DEFINE_BOOL(wasm_no_bounds_checks, false, + "disable bounds checks (performance testing only)") +DEFINE_BOOL(wasm_no_stack_checks, false, + "disable stack checks (performance testing only)") +DEFINE_BOOL(wasm_math_intrinsics, true, + "intrinsify some Math imports into wasm") + +DEFINE_BOOL(wasm_shared_engine, true, + "shares one wasm engine between all isolates within a process") +DEFINE_IMPLICATION(future, wasm_shared_engine) +DEFINE_BOOL(wasm_shared_code, true, + "shares code underlying a wasm module when it is transferred") +DEFINE_IMPLICATION(future, wasm_shared_code) +DEFINE_BOOL(wasm_trap_handler, true, + "use signal handlers to catch out of bounds memory access in wasm" + " (currently Linux x86_64 only)") +DEFINE_BOOL(wasm_fuzzer_gen_test, false, + "generate a test case when running a wasm fuzzer") +DEFINE_IMPLICATION(wasm_fuzzer_gen_test, single_threaded) +DEFINE_BOOL(print_wasm_code, false, "Print WebAssembly code") +DEFINE_BOOL(print_wasm_stub_code, false, "Print WebAssembly stub code") +DEFINE_BOOL(wasm_interpret_all, false, + "execute all wasm code in the wasm interpreter") +DEFINE_BOOL(asm_wasm_lazy_compilation, false, + "enable lazy compilation for asm-wasm modules") +DEFINE_IMPLICATION(validate_asm, asm_wasm_lazy_compilation) +DEFINE_BOOL(wasm_lazy_compilation, false, + "enable lazy compilation for all wasm modules") +DEFINE_DEBUG_BOOL(trace_wasm_lazy_compilation, false, + "trace lazy compilation of wasm functions") +DEFINE_BOOL(wasm_grow_shared_memory, false, + "allow growing shared WebAssembly memory objects") +DEFINE_BOOL(wasm_lazy_validation, false, + "enable lazy validation for lazily compiled wasm functions") +// wasm-interpret-all resets {asm-,}wasm-lazy-compilation. +DEFINE_NEG_IMPLICATION(wasm_interpret_all, asm_wasm_lazy_compilation) +DEFINE_NEG_IMPLICATION(wasm_interpret_all, wasm_lazy_compilation) +DEFINE_NEG_IMPLICATION(wasm_interpret_all, wasm_tier_up) +DEFINE_BOOL(wasm_code_gc, false, "enable garbage collection of wasm code") +DEFINE_IMPLICATION(future, wasm_code_gc) +DEFINE_BOOL(trace_wasm_code_gc, false, "trace garbage collection of wasm code") +DEFINE_BOOL(stress_wasm_code_gc, false, + "stress test garbage collection of wasm code") + +// Profiler flags. +DEFINE_INT(frame_count, 1, "number of stack frames inspected by the profiler") + +DEFINE_INT(stress_sampling_allocation_profiler, 0, + "Enables sampling allocation profiler with X as a sample interval") + +// Garbage collections flags. +DEFINE_SIZE_T(min_semi_space_size, 0, + "min size of a semi-space (in MBytes), the new space consists of " + "two semi-spaces") +DEFINE_SIZE_T(max_semi_space_size, 0, + "max size of a semi-space (in MBytes), the new space consists of " + "two semi-spaces") +DEFINE_INT(semi_space_growth_factor, 2, "factor by which to grow the new space") +DEFINE_BOOL(experimental_new_space_growth_heuristic, false, + "Grow the new space based on the percentage of survivors instead " + "of their absolute value.") +DEFINE_SIZE_T(max_old_space_size, 0, "max size of the old space (in Mbytes)") +DEFINE_BOOL(huge_max_old_generation_size, false, + "Increase max size of the old space to 4 GB for x64 systems with" + "the physical memory bigger than 16 GB") +DEFINE_SIZE_T(initial_old_space_size, 0, "initial old space size (in Mbytes)") +DEFINE_BOOL(global_gc_scheduling, false, + "enable GC scheduling based on global memory") +DEFINE_BOOL(gc_global, false, "always perform global GCs") +DEFINE_INT(random_gc_interval, 0, + "Collect garbage after random(0, X) allocations. It overrides " + "gc_interval.") +DEFINE_INT(gc_interval, -1, "garbage collect after <n> allocations") +DEFINE_INT(retain_maps_for_n_gc, 2, + "keeps maps alive for <n> old space garbage collections") +DEFINE_BOOL(trace_gc, false, + "print one trace line following each garbage collection") +DEFINE_BOOL(trace_gc_nvp, false, + "print one detailed trace line in name=value format " + "after each garbage collection") +DEFINE_BOOL(trace_gc_ignore_scavenger, false, + "do not print trace line after scavenger collection") +DEFINE_BOOL(trace_idle_notification, false, + "print one trace line following each idle notification") +DEFINE_BOOL(trace_idle_notification_verbose, false, + "prints the heap state used by the idle notification") +DEFINE_BOOL(trace_gc_verbose, false, + "print more details following each garbage collection") +DEFINE_IMPLICATION(trace_gc_verbose, trace_gc) + +DEFINE_INT(trace_allocation_stack_interval, -1, + "print stack trace after <n> free-list allocations") +DEFINE_INT(trace_duplicate_threshold_kb, 0, + "print duplicate objects in the heap if their size is more than " + "given threshold") +DEFINE_BOOL(trace_fragmentation, false, "report fragmentation for old space") +DEFINE_BOOL(trace_fragmentation_verbose, false, + "report fragmentation for old space (detailed)") +DEFINE_BOOL(trace_evacuation, false, "report evacuation statistics") +DEFINE_BOOL(trace_mutator_utilization, false, + "print mutator utilization, allocation speed, gc speed") +DEFINE_BOOL(incremental_marking, true, "use incremental marking") +DEFINE_BOOL(incremental_marking_wrappers, true, + "use incremental marking for marking wrappers") +DEFINE_BOOL(trace_unmapper, false, "Trace the unmapping") +DEFINE_BOOL(parallel_scavenge, true, "parallel scavenge") +DEFINE_BOOL(trace_parallel_scavenge, false, "trace parallel scavenge") +DEFINE_BOOL(write_protect_code_memory, true, "write protect code memory") +#ifdef V8_CONCURRENT_MARKING +#define V8_CONCURRENT_MARKING_BOOL true +#else +#define V8_CONCURRENT_MARKING_BOOL false +#endif +DEFINE_BOOL(concurrent_marking, V8_CONCURRENT_MARKING_BOOL, + "use concurrent marking") +DEFINE_BOOL(parallel_marking, true, "use parallel marking in atomic pause") +DEFINE_INT(ephemeron_fixpoint_iterations, 10, + "number of fixpoint iterations it takes to switch to linear " + "ephemeron algorithm") +DEFINE_BOOL(trace_concurrent_marking, false, "trace concurrent marking") +DEFINE_BOOL(concurrent_store_buffer, true, + "use concurrent store buffer processing") +DEFINE_BOOL(concurrent_sweeping, true, "use concurrent sweeping") +DEFINE_BOOL(parallel_compaction, true, "use parallel compaction") +DEFINE_BOOL(parallel_pointer_update, true, + "use parallel pointer update during compaction") +DEFINE_BOOL(detect_ineffective_gcs_near_heap_limit, true, + "trigger out-of-memory failure to avoid GC storm near heap limit") +DEFINE_BOOL(trace_incremental_marking, false, + "trace progress of the incremental marking") +DEFINE_BOOL(trace_stress_marking, false, "trace stress marking progress") +DEFINE_BOOL(trace_stress_scavenge, false, "trace stress scavenge progress") +DEFINE_BOOL(track_gc_object_stats, false, + "track object counts and memory usage") +DEFINE_BOOL(trace_gc_object_stats, false, + "trace object counts and memory usage") +DEFINE_BOOL(trace_zone_stats, false, "trace zone memory usage") +DEFINE_BOOL(track_retaining_path, false, + "enable support for tracking retaining path") +DEFINE_BOOL(concurrent_array_buffer_freeing, true, + "free array buffer allocations on a background thread") +DEFINE_INT(gc_stats, 0, "Used by tracing internally to enable gc statistics") +DEFINE_IMPLICATION(trace_gc_object_stats, track_gc_object_stats) +DEFINE_GENERIC_IMPLICATION( + track_gc_object_stats, + TracingFlags::gc_stats.store( + v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE)) +DEFINE_GENERIC_IMPLICATION( + trace_gc_object_stats, + TracingFlags::gc_stats.store( + v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE)) +DEFINE_NEG_IMPLICATION(trace_gc_object_stats, incremental_marking) +DEFINE_NEG_IMPLICATION(track_retaining_path, incremental_marking) +DEFINE_NEG_IMPLICATION(track_retaining_path, parallel_marking) +DEFINE_NEG_IMPLICATION(track_retaining_path, concurrent_marking) +DEFINE_BOOL(track_detached_contexts, true, + "track native contexts that are expected to be garbage collected") +DEFINE_BOOL(trace_detached_contexts, false, + "trace native contexts that are expected to be garbage collected") +DEFINE_IMPLICATION(trace_detached_contexts, track_detached_contexts) +#ifdef VERIFY_HEAP +DEFINE_BOOL(verify_heap, false, "verify heap pointers before and after GC") +DEFINE_BOOL(verify_heap_skip_remembered_set, false, + "disable remembered set verification") +#endif +DEFINE_BOOL(move_object_start, true, "enable moving of object starts") +DEFINE_BOOL(memory_reducer, true, "use memory reducer") +DEFINE_BOOL(memory_reducer_for_small_heaps, true, + "use memory reducer for small heaps") +DEFINE_INT(heap_growing_percent, 0, + "specifies heap growing factor as (1 + heap_growing_percent/100)") +DEFINE_INT(v8_os_page_size, 0, "override OS page size (in KBytes)") +DEFINE_BOOL(always_compact, false, "Perform compaction on every full GC") +DEFINE_BOOL(never_compact, false, + "Never perform compaction on full GC - testing only") +DEFINE_BOOL(compact_code_space, true, "Compact code space on full collections") +DEFINE_BOOL(flush_bytecode, true, + "flush of bytecode when it has not been executed recently") +DEFINE_BOOL(stress_flush_bytecode, false, "stress bytecode flushing") +DEFINE_IMPLICATION(stress_flush_bytecode, flush_bytecode) +DEFINE_BOOL(use_marking_progress_bar, true, + "Use a progress bar to scan large objects in increments when " + "incremental marking is active.") +DEFINE_BOOL(force_marking_deque_overflows, false, + "force overflows of marking deque by reducing it's size " + "to 64 words") +DEFINE_BOOL(stress_compaction, false, + "stress the GC compactor to flush out bugs (implies " + "--force_marking_deque_overflows)") +DEFINE_BOOL(stress_compaction_random, false, + "Stress GC compaction by selecting random percent of pages as " + "evacuation candidates. It overrides stress_compaction.") +DEFINE_BOOL(stress_incremental_marking, false, + "force incremental marking for small heaps and run it more often") + +DEFINE_BOOL(fuzzer_gc_analysis, false, + "prints number of allocations and enables analysis mode for gc " + "fuzz testing, e.g. --stress-marking, --stress-scavenge") +DEFINE_INT(stress_marking, 0, + "force marking at random points between 0 and X (inclusive) percent " + "of the regular marking start limit") +DEFINE_INT(stress_scavenge, 0, + "force scavenge at random points between 0 and X (inclusive) " + "percent of the new space capacity") +DEFINE_IMPLICATION(fuzzer_gc_analysis, stress_marking) +DEFINE_IMPLICATION(fuzzer_gc_analysis, stress_scavenge) + +// These flags will be removed after experiments. Do not rely on them. +DEFINE_BOOL(gc_experiment_background_schedule, false, + "new background GC schedule heuristics") +DEFINE_BOOL(gc_experiment_less_compaction, false, + "less compaction in non-memory reducing mode") + +DEFINE_BOOL(disable_abortjs, false, "disables AbortJS runtime function") + +DEFINE_BOOL(manual_evacuation_candidates_selection, false, + "Test mode only flag. It allows an unit test to select evacuation " + "candidates pages (requires --stress_compaction).") +DEFINE_BOOL(fast_promotion_new_space, false, + "fast promote new space on high survival rates") + +DEFINE_BOOL(clear_free_memory, false, "initialize free memory with 0") + +DEFINE_BOOL(young_generation_large_objects, true, + "allocates large objects by default in the young generation large " + "object space") + +DEFINE_BOOL(idle_time_scavenge, true, "Perform scavenges in idle time.") + +// assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc +DEFINE_BOOL(debug_code, DEBUG_BOOL, + "generate extra code (assertions) for debugging") +DEFINE_BOOL(code_comments, false, + "emit comments in code disassembly; for more readable source " + "positions you should add --no-concurrent_recompilation") +DEFINE_BOOL(enable_sse3, true, "enable use of SSE3 instructions if available") +DEFINE_BOOL(enable_ssse3, true, "enable use of SSSE3 instructions if available") +DEFINE_BOOL(enable_sse4_1, true, + "enable use of SSE4.1 instructions if available") +DEFINE_BOOL(enable_sahf, true, + "enable use of SAHF instruction if available (X64 only)") +DEFINE_BOOL(enable_avx, true, "enable use of AVX instructions if available") +DEFINE_BOOL(enable_fma3, true, "enable use of FMA3 instructions if available") +DEFINE_BOOL(enable_bmi1, true, "enable use of BMI1 instructions if available") +DEFINE_BOOL(enable_bmi2, true, "enable use of BMI2 instructions if available") +DEFINE_BOOL(enable_lzcnt, true, "enable use of LZCNT instruction if available") +DEFINE_BOOL(enable_popcnt, true, + "enable use of POPCNT instruction if available") +DEFINE_STRING(arm_arch, ARM_ARCH_DEFAULT, + "generate instructions for the selected ARM architecture if " + "available: armv6, armv7, armv7+sudiv or armv8") +DEFINE_BOOL(force_long_branches, false, + "force all emitted branches to be in long mode (MIPS/PPC only)") +DEFINE_STRING(mcpu, "auto", "enable optimization for specific cpu") +DEFINE_BOOL(partial_constant_pool, true, + "enable use of partial constant pools (X64 only)") + +// Controlling source positions for Torque/CSA code. +DEFINE_BOOL(enable_source_at_csa_bind, false, + "Include source information in the binary at CSA bind locations.") + +// Deprecated ARM flags (replaced by arm_arch). +DEFINE_MAYBE_BOOL(enable_armv7, "deprecated (use --arm_arch instead)") +DEFINE_MAYBE_BOOL(enable_vfp3, "deprecated (use --arm_arch instead)") +DEFINE_MAYBE_BOOL(enable_32dregs, "deprecated (use --arm_arch instead)") +DEFINE_MAYBE_BOOL(enable_neon, "deprecated (use --arm_arch instead)") +DEFINE_MAYBE_BOOL(enable_sudiv, "deprecated (use --arm_arch instead)") +DEFINE_MAYBE_BOOL(enable_armv8, "deprecated (use --arm_arch instead)") + +// regexp-macro-assembler-*.cc +DEFINE_BOOL(enable_regexp_unaligned_accesses, true, + "enable unaligned accesses for the regexp engine") + +// api.cc +DEFINE_BOOL(script_streaming, true, "enable parsing on background") +DEFINE_BOOL(disable_old_api_accessors, false, + "Disable old-style API accessors whose setters trigger through the " + "prototype chain") + +// bootstrapper.cc +DEFINE_BOOL(expose_free_buffer, false, "expose freeBuffer extension") +DEFINE_BOOL(expose_gc, false, "expose gc extension") +DEFINE_STRING(expose_gc_as, nullptr, + "expose gc extension under the specified name") +DEFINE_IMPLICATION(expose_gc_as, expose_gc) +DEFINE_BOOL(expose_externalize_string, false, + "expose externalize string extension") +DEFINE_BOOL(expose_trigger_failure, false, "expose trigger-failure extension") +DEFINE_INT(stack_trace_limit, 10, "number of stack frames to capture") +DEFINE_BOOL(builtins_in_stack_traces, false, + "show built-in functions in stack traces") +DEFINE_BOOL(experimental_stack_trace_frames, false, + "enable experimental frames (API/Builtins) and stack trace layout") +DEFINE_BOOL(disallow_code_generation_from_strings, false, + "disallow eval and friends") +DEFINE_BOOL(expose_async_hooks, false, "expose async_hooks object") + +// builtins.cc +DEFINE_BOOL(allow_unsafe_function_constructor, false, + "allow invoking the function constructor without security checks") +DEFINE_BOOL(force_slow_path, false, "always take the slow path for builtins") +DEFINE_BOOL(test_small_max_function_context_stub_size, false, + "enable testing the function context size overflow path " + "by making the maximum size smaller") + +DEFINE_BOOL(inline_new, true, "use fast inline allocation") +DEFINE_NEG_NEG_IMPLICATION(inline_new, turbo_allocation_folding) + +// codegen-ia32.cc / codegen-arm.cc +DEFINE_BOOL(trace, false, "trace function calls") + +// codegen.cc +DEFINE_BOOL(lazy, true, "use lazy compilation") +DEFINE_BOOL(max_lazy, false, "ignore eager compilation hints") +DEFINE_IMPLICATION(max_lazy, lazy) +DEFINE_BOOL(trace_opt, false, "trace lazy optimization") +DEFINE_BOOL(trace_opt_verbose, false, "extra verbose compilation tracing") +DEFINE_IMPLICATION(trace_opt_verbose, trace_opt) +DEFINE_BOOL(trace_opt_stats, false, "trace lazy optimization statistics") +DEFINE_BOOL(trace_deopt, false, "trace optimize function deoptimization") +DEFINE_BOOL(trace_file_names, false, + "include file names in trace-opt/trace-deopt output") +DEFINE_BOOL(always_opt, false, "always try to optimize functions") +DEFINE_BOOL(always_osr, false, "always try to OSR functions") +DEFINE_BOOL(prepare_always_opt, false, "prepare for turning on always opt") + +DEFINE_BOOL(trace_serializer, false, "print code serializer trace") +#ifdef DEBUG +DEFINE_BOOL(external_reference_stats, false, + "print statistics on external references used during serialization") +#endif // DEBUG + +// compilation-cache.cc +DEFINE_BOOL(compilation_cache, true, "enable compilation cache") + +DEFINE_BOOL(cache_prototype_transitions, true, "cache prototype transitions") + +// compiler-dispatcher.cc +DEFINE_BOOL(parallel_compile_tasks, false, "enable parallel compile tasks") +DEFINE_BOOL(compiler_dispatcher, false, "enable compiler dispatcher") +DEFINE_IMPLICATION(parallel_compile_tasks, compiler_dispatcher) +DEFINE_BOOL(trace_compiler_dispatcher, false, + "trace compiler dispatcher activity") + +// cpu-profiler.cc +DEFINE_INT(cpu_profiler_sampling_interval, 1000, + "CPU profiler sampling interval in microseconds") + +// debugger +DEFINE_BOOL( + trace_side_effect_free_debug_evaluate, false, + "print debug messages for side-effect-free debug-evaluate for testing") +DEFINE_BOOL(hard_abort, true, "abort by crashing") + +// inspector +DEFINE_BOOL(expose_inspector_scripts, false, + "expose injected-script-source.js for debugging") + +// execution.cc +DEFINE_INT(stack_size, V8_DEFAULT_STACK_SIZE_KB, + "default size of stack region v8 is allowed to use (in kBytes)") + +// frames.cc +DEFINE_INT(max_stack_trace_source_length, 300, + "maximum length of function source code printed in a stack trace.") + +// execution.cc, messages.cc +DEFINE_BOOL(clear_exceptions_on_js_entry, false, + "clear pending exceptions when entering JavaScript") + +// counters.cc +DEFINE_INT(histogram_interval, 600000, + "time interval in ms for aggregating memory histograms") + +// heap-snapshot-generator.cc +DEFINE_BOOL(heap_profiler_trace_objects, false, + "Dump heap object allocations/movements/size_updates") +DEFINE_BOOL(heap_profiler_use_embedder_graph, true, + "Use the new EmbedderGraph API to get embedder nodes") +DEFINE_INT(heap_snapshot_string_limit, 1024, + "truncate strings to this length in the heap snapshot") + +// sampling-heap-profiler.cc +DEFINE_BOOL(sampling_heap_profiler_suppress_randomness, false, + "Use constant sample intervals to eliminate test flakiness") + +// v8.cc +DEFINE_BOOL(use_idle_notification, true, + "Use idle notification to reduce memory footprint.") +// ic.cc +DEFINE_BOOL(trace_ic, false, + "trace inline cache state transitions for tools/ic-processor") +DEFINE_IMPLICATION(trace_ic, log_code) +DEFINE_GENERIC_IMPLICATION( + trace_ic, TracingFlags::ic_stats.store( + v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE)) +DEFINE_BOOL_READONLY(fast_map_update, false, + "enable fast map update by caching the migration target") +DEFINE_BOOL(modify_field_representation_inplace, true, + "enable in-place field representation updates") +DEFINE_INT(max_polymorphic_map_count, 4, + "maximum number of maps to track in POLYMORPHIC state") + +DEFINE_BOOL(native_code_counters, DEBUG_BOOL, + "generate extra code for manipulating stats counters") + +// objects.cc +DEFINE_BOOL(thin_strings, true, "Enable ThinString support") +DEFINE_BOOL(trace_prototype_users, false, + "Trace updates to prototype user tracking") +DEFINE_BOOL(use_verbose_printer, true, "allows verbose printing") +DEFINE_BOOL(trace_for_in_enumerate, false, "Trace for-in enumerate slow-paths") +DEFINE_BOOL(trace_maps, false, "trace map creation") +DEFINE_BOOL(trace_maps_details, true, "also log map details") +DEFINE_IMPLICATION(trace_maps, log_code) + +// parser.cc +DEFINE_BOOL(allow_natives_syntax, false, "allow natives syntax") +DEFINE_BOOL(parse_only, false, "only parse the sources") + +// simulator-arm.cc, simulator-arm64.cc and simulator-mips.cc +DEFINE_BOOL(trace_sim, false, "Trace simulator execution") +DEFINE_BOOL(debug_sim, false, "Enable debugging the simulator") +DEFINE_BOOL(check_icache, false, + "Check icache flushes in ARM and MIPS simulator") +DEFINE_INT(stop_sim_at, 0, "Simulator stop after x number of instructions") +#if defined(V8_TARGET_ARCH_ARM64) || defined(V8_TARGET_ARCH_MIPS64) || \ + defined(V8_TARGET_ARCH_PPC64) +DEFINE_INT(sim_stack_alignment, 16, + "Stack alignment in bytes in simulator. This must be a power of two " + "and it must be at least 16. 16 is default.") +#else +DEFINE_INT(sim_stack_alignment, 8, + "Stack alingment in bytes in simulator (4 or 8, 8 is default)") +#endif +DEFINE_INT(sim_stack_size, 2 * MB / KB, + "Stack size of the ARM64, MIPS64 and PPC64 simulator " + "in kBytes (default is 2 MB)") +DEFINE_BOOL(log_colour, ENABLE_LOG_COLOUR, + "When logging, try to use coloured output.") +DEFINE_BOOL(ignore_asm_unimplemented_break, false, + "Don't break for ASM_UNIMPLEMENTED_BREAK macros.") +DEFINE_BOOL(trace_sim_messages, false, + "Trace simulator debug messages. Implied by --trace-sim.") + +// isolate.cc +DEFINE_BOOL(async_stack_traces, true, + "include async stack traces in Error.stack") +DEFINE_BOOL(stack_trace_on_illegal, false, + "print stack trace when an illegal exception is thrown") +DEFINE_BOOL(abort_on_uncaught_exception, false, + "abort program (dump core) when an uncaught exception is thrown") +DEFINE_BOOL(correctness_fuzzer_suppressions, false, + "Suppress certain unspecified behaviors to ease correctness " + "fuzzing: Abort program when the stack overflows or a string " + "exceeds maximum length (as opposed to throwing RangeError). " + "Use a fixed suppression string for error messages.") +DEFINE_BOOL(randomize_hashes, true, + "randomize hashes to avoid predictable hash collisions " + "(with snapshots this option cannot override the baked-in seed)") +DEFINE_BOOL(rehash_snapshot, true, + "rehash strings from the snapshot to override the baked-in seed") +DEFINE_UINT64(hash_seed, 0, + "Fixed seed to use to hash property keys (0 means random)" + "(with snapshots this option cannot override the baked-in seed)") +DEFINE_INT(random_seed, 0, + "Default seed for initializing random generator " + "(0, the default, means to use system random).") +DEFINE_INT(fuzzer_random_seed, 0, + "Default seed for initializing fuzzer random generator " + "(0, the default, means to use v8's random number generator seed).") +DEFINE_BOOL(trace_rail, false, "trace RAIL mode") +DEFINE_BOOL(print_all_exceptions, false, + "print exception object and stack trace on each thrown exception") +DEFINE_BOOL( + detailed_error_stack_trace, false, + "includes arguments for each function call in the error stack frames array") + +// runtime.cc +DEFINE_BOOL(runtime_call_stats, false, "report runtime call counts and times") +DEFINE_GENERIC_IMPLICATION( + runtime_call_stats, + TracingFlags::runtime_stats.store( + v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE)) + +// snapshot-common.cc +#ifdef V8_EMBEDDED_BUILTINS +#define V8_EMBEDDED_BUILTINS_BOOL true +#else +#define V8_EMBEDDED_BUILTINS_BOOL false +#endif +DEFINE_BOOL_READONLY(embedded_builtins, V8_EMBEDDED_BUILTINS_BOOL, + "Embed builtin code into the binary.") +DEFINE_BOOL(profile_deserialization, false, + "Print the time it takes to deserialize the snapshot.") +DEFINE_BOOL(serialization_statistics, false, + "Collect statistics on serialized objects.") +DEFINE_UINT(serialization_chunk_size, 4096, + "Custom size for serialization chunks") + +// Regexp +DEFINE_BOOL(regexp_optimization, true, "generate optimized regexp code") +DEFINE_BOOL(regexp_mode_modifiers, false, "enable inline flags in regexp.") +DEFINE_BOOL(regexp_interpret_all, false, "interpret all regexp code") + +// Testing flags test/cctest/test-{flags,api,serialization}.cc +DEFINE_BOOL(testing_bool_flag, true, "testing_bool_flag") +DEFINE_MAYBE_BOOL(testing_maybe_bool_flag, "testing_maybe_bool_flag") +DEFINE_INT(testing_int_flag, 13, "testing_int_flag") +DEFINE_FLOAT(testing_float_flag, 2.5, "float-flag") +DEFINE_STRING(testing_string_flag, "Hello, world!", "string-flag") +DEFINE_INT(testing_prng_seed, 42, "Seed used for threading test randomness") + +// mksnapshot.cc +DEFINE_STRING(embedded_src, nullptr, + "Path for the generated embedded data file. (mksnapshot only)") +DEFINE_STRING( + embedded_variant, nullptr, + "Label to disambiguate symbols in embedded data file. (mksnapshot only)") +DEFINE_STRING(startup_src, nullptr, + "Write V8 startup as C++ src. (mksnapshot only)") +DEFINE_STRING(startup_blob, nullptr, + "Write V8 startup blob file. (mksnapshot only)") +DEFINE_STRING(target_arch, nullptr, + "The mksnapshot target arch. (mksnapshot only)") +DEFINE_STRING(target_os, nullptr, "The mksnapshot target os. (mksnapshot only)") + +// +// Minor mark compact collector flags. +// +#ifdef ENABLE_MINOR_MC +DEFINE_BOOL(minor_mc_parallel_marking, true, + "use parallel marking for the young generation") +DEFINE_BOOL(trace_minor_mc_parallel_marking, false, + "trace parallel marking for the young generation") +DEFINE_BOOL(minor_mc, false, "perform young generation mark compact GCs") +#endif // ENABLE_MINOR_MC + +// +// Dev shell flags +// + +DEFINE_BOOL(help, false, "Print usage message, including flags, on console") +DEFINE_BOOL(dump_counters, false, "Dump counters on exit") +DEFINE_BOOL(dump_counters_nvp, false, + "Dump counters as name-value pairs on exit") +DEFINE_BOOL(use_external_strings, false, "Use external strings for source code") + +DEFINE_STRING(map_counters, "", "Map counters to a file") +DEFINE_BOOL(mock_arraybuffer_allocator, false, + "Use a mock ArrayBuffer allocator for testing.") +DEFINE_SIZE_T(mock_arraybuffer_allocator_limit, 0, + "Memory limit for mock ArrayBuffer allocator used to simulate " + "OOM for testing.") + +// +// GDB JIT integration flags. +// +#undef FLAG +#ifdef ENABLE_GDB_JIT_INTERFACE +#define FLAG FLAG_FULL +#else +#define FLAG FLAG_READONLY +#endif + +DEFINE_BOOL(gdbjit, false, "enable GDBJIT interface") +DEFINE_BOOL(gdbjit_full, false, "enable GDBJIT interface for all code objects") +DEFINE_BOOL(gdbjit_dump, false, "dump elf objects with debug info to disk") +DEFINE_STRING(gdbjit_dump_filter, "", + "dump only objects containing this substring") + +#ifdef ENABLE_GDB_JIT_INTERFACE +DEFINE_IMPLICATION(gdbjit_full, gdbjit) +DEFINE_IMPLICATION(gdbjit_dump, gdbjit) +#endif +DEFINE_NEG_IMPLICATION(gdbjit, compact_code_space) + +// +// Debug only flags +// +#undef FLAG +#ifdef DEBUG +#define FLAG FLAG_FULL +#else +#define FLAG FLAG_READONLY +#endif + +// checks.cc +#ifdef ENABLE_SLOW_DCHECKS +DEFINE_BOOL(enable_slow_asserts, true, + "enable asserts that are slow to execute") +#endif + +// codegen-ia32.cc / codegen-arm.cc / macro-assembler-*.cc +DEFINE_BOOL(print_ast, false, "print source AST") +DEFINE_BOOL(trap_on_abort, false, "replace aborts by breakpoints") + +// compiler.cc +DEFINE_BOOL(print_scopes, false, "print scopes") + +// contexts.cc +DEFINE_BOOL(trace_contexts, false, "trace contexts operations") + +// heap.cc +DEFINE_BOOL(gc_verbose, false, "print stuff during garbage collection") +DEFINE_BOOL(code_stats, false, "report code statistics after GC") +DEFINE_BOOL(print_handles, false, "report handles after GC") +DEFINE_BOOL(check_handle_count, false, + "Check that there are not too many handles at GC") +DEFINE_BOOL(print_global_handles, false, "report global handles after GC") + +// TurboFan debug-only flags. +DEFINE_BOOL(trace_turbo_escape, false, "enable tracing in escape analysis") + +// objects.cc +DEFINE_BOOL(trace_module_status, false, + "Trace status transitions of ECMAScript modules") +DEFINE_BOOL(trace_normalization, false, + "prints when objects are turned into dictionaries.") + +// runtime.cc +DEFINE_BOOL(trace_lazy, false, "trace lazy compilation") + +// spaces.cc +DEFINE_BOOL(collect_heap_spill_statistics, false, + "report heap spill statistics along with heap_stats " + "(requires heap_stats)") +DEFINE_BOOL(trace_isolates, false, "trace isolate state changes") + +// Regexp +DEFINE_BOOL(regexp_possessive_quantifier, false, + "enable possessive quantifier syntax for testing") +DEFINE_BOOL(trace_regexp_bytecodes, false, "trace regexp bytecode execution") +DEFINE_BOOL(trace_regexp_assembler, false, + "trace regexp macro assembler calls.") +DEFINE_BOOL(trace_regexp_parser, false, "trace regexp parsing") + +// Debugger +DEFINE_BOOL(print_break_location, false, "print source location on debug break") + +// wasm instance management +DEFINE_DEBUG_BOOL(trace_wasm_instances, false, + "trace creation and collection of wasm instances") + +// +// Logging and profiling flags +// +#undef FLAG +#define FLAG FLAG_FULL + +// log.cc +DEFINE_BOOL(log, false, + "Minimal logging (no API, code, GC, suspect, or handles samples).") +DEFINE_BOOL(log_all, false, "Log all events to the log file.") +DEFINE_BOOL(log_api, false, "Log API events to the log file.") +DEFINE_BOOL(log_code, false, + "Log code events to the log file without profiling.") +DEFINE_BOOL(log_handles, false, "Log global handle events.") +DEFINE_BOOL(log_suspect, false, "Log suspect operations.") +DEFINE_BOOL(log_source_code, false, "Log source code.") +DEFINE_BOOL(log_function_events, false, + "Log function events " + "(parse, compile, execute) separately.") +DEFINE_BOOL(prof, false, + "Log statistical profiling information (implies --log-code).") + +DEFINE_BOOL(detailed_line_info, false, + "Always generate detailed line information for CPU profiling.") + +#if defined(ANDROID) +// Phones and tablets have processors that are much slower than desktop +// and laptop computers for which current heuristics are tuned. +#define DEFAULT_PROF_SAMPLING_INTERVAL 5000 +#else +#define DEFAULT_PROF_SAMPLING_INTERVAL 1000 +#endif +DEFINE_INT(prof_sampling_interval, DEFAULT_PROF_SAMPLING_INTERVAL, + "Interval for --prof samples (in microseconds).") +#undef DEFAULT_PROF_SAMPLING_INTERVAL + +DEFINE_BOOL(prof_cpp, false, "Like --prof, but ignore generated code.") +DEFINE_IMPLICATION(prof, prof_cpp) +DEFINE_BOOL(prof_browser_mode, true, + "Used with --prof, turns on browser-compatible mode for profiling.") +DEFINE_STRING(logfile, "v8.log", "Specify the name of the log file.") +DEFINE_BOOL(logfile_per_isolate, true, "Separate log files for each isolate.") +DEFINE_BOOL(ll_prof, false, "Enable low-level linux profiler.") +DEFINE_BOOL(perf_basic_prof, false, + "Enable perf linux profiler (basic support).") +DEFINE_NEG_IMPLICATION(perf_basic_prof, compact_code_space) +DEFINE_BOOL(perf_basic_prof_only_functions, false, + "Only report function code ranges to perf (i.e. no stubs).") +DEFINE_IMPLICATION(perf_basic_prof_only_functions, perf_basic_prof) +DEFINE_BOOL(perf_prof, false, + "Enable perf linux profiler (experimental annotate support).") +DEFINE_NEG_IMPLICATION(perf_prof, compact_code_space) +// TODO(v8:8462) Remove implication once perf supports remapping. +DEFINE_NEG_IMPLICATION(perf_prof, write_protect_code_memory) +DEFINE_NEG_IMPLICATION(perf_prof, wasm_write_protect_code_memory) +DEFINE_BOOL(perf_prof_unwinding_info, false, + "Enable unwinding info for perf linux profiler (experimental).") +DEFINE_IMPLICATION(perf_prof, perf_prof_unwinding_info) +DEFINE_STRING(gc_fake_mmap, "/tmp/__v8_gc__", + "Specify the name of the file for fake gc mmap used in ll_prof") +DEFINE_BOOL(log_internal_timer_events, false, "Time internal events.") +DEFINE_IMPLICATION(log_internal_timer_events, prof) +DEFINE_BOOL(log_instruction_stats, false, "Log AArch64 instruction statistics.") +DEFINE_STRING(log_instruction_file, "arm64_inst.csv", + "AArch64 instruction statistics log file.") +DEFINE_INT(log_instruction_period, 1 << 22, + "AArch64 instruction statistics logging period.") + +DEFINE_BOOL(redirect_code_traces, false, + "output deopt information and disassembly into file " + "code-<pid>-<isolate id>.asm") +DEFINE_STRING(redirect_code_traces_to, nullptr, + "output deopt information and disassembly into the given file") + +DEFINE_BOOL(print_opt_source, false, + "print source code of optimized and inlined functions") + +DEFINE_BOOL(win64_unwinding_info, true, "Enable unwinding info for Windows/x64") + +#ifdef V8_TARGET_ARCH_ARM +// Unsupported on arm. See https://crbug.com/v8/8713. +DEFINE_BOOL_READONLY( + interpreted_frames_native_stack, false, + "Show interpreted frames on the native stack (useful for external " + "profilers).") +#else +DEFINE_BOOL(interpreted_frames_native_stack, false, + "Show interpreted frames on the native stack (useful for external " + "profilers).") +#endif + +// +// Disassembler only flags +// +#undef FLAG +#ifdef ENABLE_DISASSEMBLER +#define FLAG FLAG_FULL +#else +#define FLAG FLAG_READONLY +#endif + +// elements.cc +DEFINE_BOOL(trace_elements_transitions, false, "trace elements transitions") + +DEFINE_BOOL(trace_creation_allocation_sites, false, + "trace the creation of allocation sites") + +// codegen-ia32.cc / codegen-arm.cc +DEFINE_BOOL(print_code, false, "print generated code") +DEFINE_BOOL(print_opt_code, false, "print optimized code") +DEFINE_STRING(print_opt_code_filter, "*", "filter for printing optimized code") +DEFINE_BOOL(print_code_verbose, false, "print more information for code") +DEFINE_BOOL(print_builtin_code, false, "print generated code for builtins") +DEFINE_STRING(print_builtin_code_filter, "*", + "filter for printing builtin code") +DEFINE_BOOL(print_builtin_size, false, "print code size for builtins") + +#ifdef ENABLE_DISASSEMBLER +DEFINE_BOOL(sodium, false, + "print generated code output suitable for use with " + "the Sodium code viewer") + +DEFINE_IMPLICATION(sodium, print_code) +DEFINE_IMPLICATION(sodium, print_opt_code) +DEFINE_IMPLICATION(sodium, code_comments) + +DEFINE_BOOL(print_all_code, false, "enable all flags related to printing code") +DEFINE_IMPLICATION(print_all_code, print_code) +DEFINE_IMPLICATION(print_all_code, print_opt_code) +DEFINE_IMPLICATION(print_all_code, print_code_verbose) +DEFINE_IMPLICATION(print_all_code, print_builtin_code) +DEFINE_IMPLICATION(print_all_code, code_comments) +#endif + +#undef FLAG +#define FLAG FLAG_FULL + +// +// Predictable mode related flags. +// + +DEFINE_BOOL(predictable, false, "enable predictable mode") +DEFINE_IMPLICATION(predictable, single_threaded) +DEFINE_NEG_IMPLICATION(predictable, memory_reducer) +DEFINE_VALUE_IMPLICATION(single_threaded, wasm_num_compilation_tasks, 0) +DEFINE_NEG_IMPLICATION(single_threaded, wasm_async_compilation) + +DEFINE_BOOL(predictable_gc_schedule, false, + "Predictable garbage collection schedule. Fixes heap growing, " + "idle, and memory reducing behavior.") +DEFINE_VALUE_IMPLICATION(predictable_gc_schedule, min_semi_space_size, 4) +DEFINE_VALUE_IMPLICATION(predictable_gc_schedule, max_semi_space_size, 4) +DEFINE_VALUE_IMPLICATION(predictable_gc_schedule, heap_growing_percent, 30) +DEFINE_NEG_IMPLICATION(predictable_gc_schedule, idle_time_scavenge) +DEFINE_NEG_IMPLICATION(predictable_gc_schedule, memory_reducer) + +// +// Threading related flags. +// + +DEFINE_BOOL(single_threaded, false, "disable the use of background tasks") +DEFINE_IMPLICATION(single_threaded, single_threaded_gc) +DEFINE_NEG_IMPLICATION(single_threaded, concurrent_recompilation) +DEFINE_NEG_IMPLICATION(single_threaded, compiler_dispatcher) + +// +// Parallel and concurrent GC (Orinoco) related flags. +// +DEFINE_BOOL(single_threaded_gc, false, "disable the use of background gc tasks") +DEFINE_NEG_IMPLICATION(single_threaded_gc, concurrent_marking) +DEFINE_NEG_IMPLICATION(single_threaded_gc, concurrent_sweeping) +DEFINE_NEG_IMPLICATION(single_threaded_gc, parallel_compaction) +DEFINE_NEG_IMPLICATION(single_threaded_gc, parallel_marking) +DEFINE_NEG_IMPLICATION(single_threaded_gc, parallel_pointer_update) +DEFINE_NEG_IMPLICATION(single_threaded_gc, parallel_scavenge) +DEFINE_NEG_IMPLICATION(single_threaded_gc, concurrent_store_buffer) +#ifdef ENABLE_MINOR_MC +DEFINE_NEG_IMPLICATION(single_threaded_gc, minor_mc_parallel_marking) +#endif // ENABLE_MINOR_MC +DEFINE_NEG_IMPLICATION(single_threaded_gc, concurrent_array_buffer_freeing) + +#undef FLAG + +#ifdef VERIFY_PREDICTABLE +#define FLAG FLAG_FULL +#else +#define FLAG FLAG_READONLY +#endif + +DEFINE_BOOL(verify_predictable, false, + "this mode is used for checking that V8 behaves predictably") +DEFINE_INT(dump_allocations_digest_at_alloc, -1, + "dump allocations digest each n-th allocation") + +// +// Read-only flags +// +#undef FLAG +#define FLAG FLAG_READONLY + +// assembler.h +DEFINE_BOOL(enable_embedded_constant_pool, V8_EMBEDDED_CONSTANT_POOL, + "enable use of embedded constant pools (PPC only)") + +DEFINE_BOOL(unbox_double_fields, V8_DOUBLE_FIELDS_UNBOXING, + "enable in-object double fields unboxing (64-bit only)") +DEFINE_IMPLICATION(unbox_double_fields, track_double_fields) + +DEFINE_BOOL(raw_heap_snapshots, V8_ENABLE_RAW_HEAP_SNAPSHOTS_BOOL, + "enable raw heap snapshots contain garbage collection internals") + +// Cleanup... +#undef FLAG_FULL +#undef FLAG_READONLY +#undef FLAG +#undef FLAG_ALIAS + +#undef DEFINE_BOOL +#undef DEFINE_MAYBE_BOOL +#undef DEFINE_DEBUG_BOOL +#undef DEFINE_INT +#undef DEFINE_STRING +#undef DEFINE_FLOAT +#undef DEFINE_IMPLICATION +#undef DEFINE_NEG_IMPLICATION +#undef DEFINE_NEG_VALUE_IMPLICATION +#undef DEFINE_VALUE_IMPLICATION +#undef DEFINE_GENERIC_IMPLICATION +#undef DEFINE_ALIAS_BOOL +#undef DEFINE_ALIAS_INT +#undef DEFINE_ALIAS_STRING +#undef DEFINE_ALIAS_FLOAT + +#undef FLAG_MODE_DECLARE +#undef FLAG_MODE_DEFINE +#undef FLAG_MODE_DEFINE_DEFAULTS +#undef FLAG_MODE_META +#undef FLAG_MODE_DEFINE_IMPLICATIONS +#undef FLAG_MODE_APPLY + +#undef COMMA diff --git a/deps/v8/src/flags/flags.cc b/deps/v8/src/flags/flags.cc new file mode 100644 index 0000000000..147e8b20ce --- /dev/null +++ b/deps/v8/src/flags/flags.cc @@ -0,0 +1,636 @@ +// Copyright 2006-2008 the V8 project authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#include "src/flags/flags.h" + +#include <cctype> +#include <cerrno> +#include <cinttypes> +#include <cstdlib> +#include <sstream> + +#include "src/base/functional.h" +#include "src/base/platform/platform.h" +#include "src/codegen/cpu-features.h" +#include "src/logging/counters.h" +#include "src/utils/allocation.h" +#include "src/utils/memcopy.h" +#include "src/utils/ostreams.h" +#include "src/utils/utils.h" +#include "src/wasm/wasm-limits.h" + +namespace v8 { +namespace internal { + +// Define all of our flags. +#define FLAG_MODE_DEFINE +#include "src/flags/flag-definitions.h" // NOLINT(build/include) + +// Define all of our flags default values. +#define FLAG_MODE_DEFINE_DEFAULTS +#include "src/flags/flag-definitions.h" // NOLINT(build/include) + +namespace { + +// This structure represents a single entry in the flag system, with a pointer +// to the actual flag, default value, comment, etc. This is designed to be POD +// initialized as to avoid requiring static constructors. +struct Flag { + enum FlagType { + TYPE_BOOL, + TYPE_MAYBE_BOOL, + TYPE_INT, + TYPE_UINT, + TYPE_UINT64, + TYPE_FLOAT, + TYPE_SIZE_T, + TYPE_STRING, + }; + + FlagType type_; // What type of flag, bool, int, or string. + const char* name_; // Name of the flag, ex "my_flag". + void* valptr_; // Pointer to the global flag variable. + const void* defptr_; // Pointer to the default value. + const char* cmt_; // A comment about the flags purpose. + bool owns_ptr_; // Does the flag own its string value? + + FlagType type() const { return type_; } + + const char* name() const { return name_; } + + const char* comment() const { return cmt_; } + + bool* bool_variable() const { + DCHECK(type_ == TYPE_BOOL); + return reinterpret_cast<bool*>(valptr_); + } + + MaybeBoolFlag* maybe_bool_variable() const { + DCHECK(type_ == TYPE_MAYBE_BOOL); + return reinterpret_cast<MaybeBoolFlag*>(valptr_); + } + + int* int_variable() const { + DCHECK(type_ == TYPE_INT); + return reinterpret_cast<int*>(valptr_); + } + + unsigned int* uint_variable() const { + DCHECK(type_ == TYPE_UINT); + return reinterpret_cast<unsigned int*>(valptr_); + } + + uint64_t* uint64_variable() const { + DCHECK(type_ == TYPE_UINT64); + return reinterpret_cast<uint64_t*>(valptr_); + } + + double* float_variable() const { + DCHECK(type_ == TYPE_FLOAT); + return reinterpret_cast<double*>(valptr_); + } + + size_t* size_t_variable() const { + DCHECK(type_ == TYPE_SIZE_T); + return reinterpret_cast<size_t*>(valptr_); + } + + const char* string_value() const { + DCHECK(type_ == TYPE_STRING); + return *reinterpret_cast<const char**>(valptr_); + } + + void set_string_value(const char* value, bool owns_ptr) { + DCHECK(type_ == TYPE_STRING); + const char** ptr = reinterpret_cast<const char**>(valptr_); + if (owns_ptr_ && *ptr != nullptr) DeleteArray(*ptr); + *ptr = value; + owns_ptr_ = owns_ptr; + } + + bool bool_default() const { + DCHECK(type_ == TYPE_BOOL); + return *reinterpret_cast<const bool*>(defptr_); + } + + int int_default() const { + DCHECK(type_ == TYPE_INT); + return *reinterpret_cast<const int*>(defptr_); + } + + unsigned int uint_default() const { + DCHECK(type_ == TYPE_UINT); + return *reinterpret_cast<const unsigned int*>(defptr_); + } + + uint64_t uint64_default() const { + DCHECK(type_ == TYPE_UINT64); + return *reinterpret_cast<const uint64_t*>(defptr_); + } + + double float_default() const { + DCHECK(type_ == TYPE_FLOAT); + return *reinterpret_cast<const double*>(defptr_); + } + + size_t size_t_default() const { + DCHECK(type_ == TYPE_SIZE_T); + return *reinterpret_cast<const size_t*>(defptr_); + } + + const char* string_default() const { + DCHECK(type_ == TYPE_STRING); + return *reinterpret_cast<const char* const*>(defptr_); + } + + // Compare this flag's current value against the default. + bool IsDefault() const { + switch (type_) { + case TYPE_BOOL: + return *bool_variable() == bool_default(); + case TYPE_MAYBE_BOOL: + return maybe_bool_variable()->has_value == false; + case TYPE_INT: + return *int_variable() == int_default(); + case TYPE_UINT: + return *uint_variable() == uint_default(); + case TYPE_UINT64: + return *uint64_variable() == uint64_default(); + case TYPE_FLOAT: + return *float_variable() == float_default(); + case TYPE_SIZE_T: + return *size_t_variable() == size_t_default(); + case TYPE_STRING: { + const char* str1 = string_value(); + const char* str2 = string_default(); + if (str2 == nullptr) return str1 == nullptr; + if (str1 == nullptr) return str2 == nullptr; + return strcmp(str1, str2) == 0; + } + } + UNREACHABLE(); + } + + // Set a flag back to it's default value. + void Reset() { + switch (type_) { + case TYPE_BOOL: + *bool_variable() = bool_default(); + break; + case TYPE_MAYBE_BOOL: + *maybe_bool_variable() = MaybeBoolFlag::Create(false, false); + break; + case TYPE_INT: + *int_variable() = int_default(); + break; + case TYPE_UINT: + *uint_variable() = uint_default(); + break; + case TYPE_UINT64: + *uint64_variable() = uint64_default(); + break; + case TYPE_FLOAT: + *float_variable() = float_default(); + break; + case TYPE_SIZE_T: + *size_t_variable() = size_t_default(); + break; + case TYPE_STRING: + set_string_value(string_default(), false); + break; + } + } +}; + +Flag flags[] = { +#define FLAG_MODE_META +#include "src/flags/flag-definitions.h" // NOLINT(build/include) +}; + +const size_t num_flags = sizeof(flags) / sizeof(*flags); + +} // namespace + +static const char* Type2String(Flag::FlagType type) { + switch (type) { + case Flag::TYPE_BOOL: + return "bool"; + case Flag::TYPE_MAYBE_BOOL: + return "maybe_bool"; + case Flag::TYPE_INT: + return "int"; + case Flag::TYPE_UINT: + return "uint"; + case Flag::TYPE_UINT64: + return "uint64"; + case Flag::TYPE_FLOAT: + return "float"; + case Flag::TYPE_SIZE_T: + return "size_t"; + case Flag::TYPE_STRING: + return "string"; + } + UNREACHABLE(); +} + +std::ostream& operator<<(std::ostream& os, const Flag& flag) { // NOLINT + switch (flag.type()) { + case Flag::TYPE_BOOL: + os << (*flag.bool_variable() ? "true" : "false"); + break; + case Flag::TYPE_MAYBE_BOOL: + os << (flag.maybe_bool_variable()->has_value + ? (flag.maybe_bool_variable()->value ? "true" : "false") + : "unset"); + break; + case Flag::TYPE_INT: + os << *flag.int_variable(); + break; + case Flag::TYPE_UINT: + os << *flag.uint_variable(); + break; + case Flag::TYPE_UINT64: + os << *flag.uint64_variable(); + break; + case Flag::TYPE_FLOAT: + os << *flag.float_variable(); + break; + case Flag::TYPE_SIZE_T: + os << *flag.size_t_variable(); + break; + case Flag::TYPE_STRING: { + const char* str = flag.string_value(); + os << (str ? str : "nullptr"); + break; + } + } + return os; +} + +// static +std::vector<const char*>* FlagList::argv() { + std::vector<const char*>* args = new std::vector<const char*>(8); + for (size_t i = 0; i < num_flags; ++i) { + Flag* f = &flags[i]; + if (!f->IsDefault()) { + { + bool disabled = f->type() == Flag::TYPE_BOOL && !*f->bool_variable(); + std::ostringstream os; + os << (disabled ? "--no" : "--") << f->name(); + args->push_back(StrDup(os.str().c_str())); + } + if (f->type() != Flag::TYPE_BOOL) { + std::ostringstream os; + os << *f; + args->push_back(StrDup(os.str().c_str())); + } + } + } + return args; +} + +inline char NormalizeChar(char ch) { return ch == '_' ? '-' : ch; } + +// Helper function to parse flags: Takes an argument arg and splits it into +// a flag name and flag value (or nullptr if they are missing). negated is set +// if the arg started with "-no" or "--no". The buffer may be used to NUL- +// terminate the name, it must be large enough to hold any possible name. +static void SplitArgument(const char* arg, char* buffer, int buffer_size, + const char** name, const char** value, + bool* negated) { + *name = nullptr; + *value = nullptr; + *negated = false; + + if (arg != nullptr && *arg == '-') { + // find the begin of the flag name + arg++; // remove 1st '-' + if (*arg == '-') { + arg++; // remove 2nd '-' + DCHECK_NE('\0', arg[0]); // '--' arguments are handled in the caller. + } + if (arg[0] == 'n' && arg[1] == 'o') { + arg += 2; // remove "no" + if (NormalizeChar(arg[0]) == '-') arg++; // remove dash after "no". + *negated = true; + } + *name = arg; + + // find the end of the flag name + while (*arg != '\0' && *arg != '=') arg++; + + // get the value if any + if (*arg == '=') { + // make a copy so we can NUL-terminate flag name + size_t n = arg - *name; + CHECK(n < static_cast<size_t>(buffer_size)); // buffer is too small + MemCopy(buffer, *name, n); + buffer[n] = '\0'; + *name = buffer; + // get the value + *value = arg + 1; + } + } +} + +static bool EqualNames(const char* a, const char* b) { + for (int i = 0; NormalizeChar(a[i]) == NormalizeChar(b[i]); i++) { + if (a[i] == '\0') { + return true; + } + } + return false; +} + +static Flag* FindFlag(const char* name) { + for (size_t i = 0; i < num_flags; ++i) { + if (EqualNames(name, flags[i].name())) return &flags[i]; + } + return nullptr; +} + +template <typename T> +bool TryParseUnsigned(Flag* flag, const char* arg, const char* value, + char** endp, T* out_val) { + // We do not use strtoul because it accepts negative numbers. + // Rejects values >= 2**63 when T is 64 bits wide but that + // seems like an acceptable trade-off. + uint64_t max = static_cast<uint64_t>(std::numeric_limits<T>::max()); + errno = 0; + int64_t val = static_cast<int64_t>(strtoll(value, endp, 10)); + if (val < 0 || static_cast<uint64_t>(val) > max || errno != 0) { + PrintF(stderr, + "Error: Value for flag %s of type %s is out of bounds " + "[0-%" PRIu64 "]\n", + arg, Type2String(flag->type()), max); + return false; + } + *out_val = static_cast<T>(val); + return true; +} + +// static +int FlagList::SetFlagsFromCommandLine(int* argc, char** argv, + bool remove_flags) { + int return_code = 0; + // parse arguments + for (int i = 1; i < *argc;) { + int j = i; // j > 0 + const char* arg = argv[i++]; + + // split arg into flag components + char buffer[1 * KB]; + const char* name; + const char* value; + bool negated; + SplitArgument(arg, buffer, sizeof buffer, &name, &value, &negated); + + if (name != nullptr) { + // lookup the flag + Flag* flag = FindFlag(name); + if (flag == nullptr) { + if (remove_flags) { + // We don't recognize this flag but since we're removing + // the flags we recognize we assume that the remaining flags + // will be processed somewhere else so this flag might make + // sense there. + continue; + } else { + PrintF(stderr, "Error: unrecognized flag %s\n", arg); + return_code = j; + break; + } + } + + // if we still need a flag value, use the next argument if available + if (flag->type() != Flag::TYPE_BOOL && + flag->type() != Flag::TYPE_MAYBE_BOOL && value == nullptr) { + if (i < *argc) { + value = argv[i++]; + } + if (!value) { + PrintF(stderr, "Error: missing value for flag %s of type %s\n", arg, + Type2String(flag->type())); + return_code = j; + break; + } + } + + // set the flag + char* endp = const_cast<char*>(""); // *endp is only read + switch (flag->type()) { + case Flag::TYPE_BOOL: + *flag->bool_variable() = !negated; + break; + case Flag::TYPE_MAYBE_BOOL: + *flag->maybe_bool_variable() = MaybeBoolFlag::Create(true, !negated); + break; + case Flag::TYPE_INT: + *flag->int_variable() = static_cast<int>(strtol(value, &endp, 10)); + break; + case Flag::TYPE_UINT: + if (!TryParseUnsigned(flag, arg, value, &endp, + flag->uint_variable())) { + return_code = j; + } + break; + case Flag::TYPE_UINT64: + if (!TryParseUnsigned(flag, arg, value, &endp, + flag->uint64_variable())) { + return_code = j; + } + break; + case Flag::TYPE_FLOAT: + *flag->float_variable() = strtod(value, &endp); + break; + case Flag::TYPE_SIZE_T: + if (!TryParseUnsigned(flag, arg, value, &endp, + flag->size_t_variable())) { + return_code = j; + } + break; + case Flag::TYPE_STRING: + flag->set_string_value(value ? StrDup(value) : nullptr, true); + break; + } + + // handle errors + bool is_bool_type = flag->type() == Flag::TYPE_BOOL || + flag->type() == Flag::TYPE_MAYBE_BOOL; + if ((is_bool_type && value != nullptr) || (!is_bool_type && negated) || + *endp != '\0') { + // TODO(neis): TryParseUnsigned may return with {*endp == '\0'} even in + // an error case. + PrintF(stderr, "Error: illegal value for flag %s of type %s\n", arg, + Type2String(flag->type())); + if (is_bool_type) { + PrintF(stderr, + "To set or unset a boolean flag, use --flag or --no-flag.\n"); + } + return_code = j; + break; + } + + // remove the flag & value from the command + if (remove_flags) { + while (j < i) { + argv[j++] = nullptr; + } + } + } + } + + if (FLAG_help) { + PrintHelp(); + exit(0); + } + + if (remove_flags) { + // shrink the argument list + int j = 1; + for (int i = 1; i < *argc; i++) { + if (argv[i] != nullptr) argv[j++] = argv[i]; + } + *argc = j; + } else if (return_code != 0) { + if (return_code + 1 < *argc) { + PrintF(stderr, "The remaining arguments were ignored:"); + for (int i = return_code + 1; i < *argc; ++i) { + PrintF(stderr, " %s", argv[i]); + } + PrintF(stderr, "\n"); + } + } + if (return_code != 0) PrintF(stderr, "Try --help for options\n"); + + return return_code; +} + +static char* SkipWhiteSpace(char* p) { + while (*p != '\0' && isspace(*p) != 0) p++; + return p; +} + +static char* SkipBlackSpace(char* p) { + while (*p != '\0' && isspace(*p) == 0) p++; + return p; +} + +// static +int FlagList::SetFlagsFromString(const char* str, size_t len) { + // make a 0-terminated copy of str + std::unique_ptr<char[]> copy0{NewArray<char>(len + 1)}; + MemCopy(copy0.get(), str, len); + copy0[len] = '\0'; + + // strip leading white space + char* copy = SkipWhiteSpace(copy0.get()); + + // count the number of 'arguments' + int argc = 1; // be compatible with SetFlagsFromCommandLine() + for (char* p = copy; *p != '\0'; argc++) { + p = SkipBlackSpace(p); + p = SkipWhiteSpace(p); + } + + // allocate argument array + ScopedVector<char*> argv(argc); + + // split the flags string into arguments + argc = 1; // be compatible with SetFlagsFromCommandLine() + for (char* p = copy; *p != '\0'; argc++) { + argv[argc] = p; + p = SkipBlackSpace(p); + if (*p != '\0') *p++ = '\0'; // 0-terminate argument + p = SkipWhiteSpace(p); + } + + return SetFlagsFromCommandLine(&argc, argv.begin(), false); +} + +// static +void FlagList::ResetAllFlags() { + for (size_t i = 0; i < num_flags; ++i) { + flags[i].Reset(); + } +} + +// static +void FlagList::PrintHelp() { + CpuFeatures::Probe(false); + CpuFeatures::PrintTarget(); + CpuFeatures::PrintFeatures(); + + StdoutStream os; + os << "Synopsis:\n" + " shell [options] [--shell] [<file>...]\n" + " d8 [options] [-e <string>] [--shell] [[--module] <file>...]\n\n" + " -e execute a string in V8\n" + " --shell run an interactive JavaScript shell\n" + " --module execute a file as a JavaScript module\n\n" + "Note: the --module option is implicitly enabled for *.mjs files.\n\n" + "The following syntax for options is accepted (both '-' and '--' are " + "ok):\n" + " --flag (bool flags only)\n" + " --no-flag (bool flags only)\n" + " --flag=value (non-bool flags only, no spaces around '=')\n" + " --flag value (non-bool flags only)\n" + " -- (captures all remaining args in JavaScript)\n\n" + "Options:\n"; + + for (const Flag& f : flags) { + os << " --"; + for (const char* c = f.name(); *c != '\0'; ++c) { + os << NormalizeChar(*c); + } + os << " (" << f.comment() << ")\n" + << " type: " << Type2String(f.type()) << " default: " << f + << "\n"; + } +} + +static uint32_t flag_hash = 0; + +void ComputeFlagListHash() { + std::ostringstream modified_args_as_string; +#ifdef DEBUG + modified_args_as_string << "debug"; +#endif // DEBUG + if (FLAG_embedded_builtins) { + modified_args_as_string << "embedded"; + } + for (size_t i = 0; i < num_flags; ++i) { + Flag* current = &flags[i]; + if (current->type() == Flag::TYPE_BOOL && + current->bool_variable() == &FLAG_profile_deserialization) { + // We want to be able to flip --profile-deserialization without + // causing the code cache to get invalidated by this hash. + continue; + } + if (!current->IsDefault()) { + modified_args_as_string << i; + modified_args_as_string << *current; + } + } + std::string args(modified_args_as_string.str()); + flag_hash = static_cast<uint32_t>( + base::hash_range(args.c_str(), args.c_str() + args.length())); +} + +// static +void FlagList::EnforceFlagImplications() { +#define FLAG_MODE_DEFINE_IMPLICATIONS +#include "src/flags/flag-definitions.h" // NOLINT(build/include) +#undef FLAG_MODE_DEFINE_IMPLICATIONS + ComputeFlagListHash(); +} + +uint32_t FlagList::Hash() { return flag_hash; } + +#undef FLAG_MODE_DEFINE +#undef FLAG_MODE_DEFINE_DEFAULTS +#undef FLAG_MODE_META + +} // namespace internal +} // namespace v8 diff --git a/deps/v8/src/flags/flags.h b/deps/v8/src/flags/flags.h new file mode 100644 index 0000000000..5f0a6d05a8 --- /dev/null +++ b/deps/v8/src/flags/flags.h @@ -0,0 +1,71 @@ +// Copyright 2006-2008 the V8 project authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#ifndef V8_FLAGS_FLAGS_H_ +#define V8_FLAGS_FLAGS_H_ + +#include <vector> + +#include "src/common/globals.h" +#include "src/wasm/wasm-limits.h" + +namespace v8 { +namespace internal { + +// Declare all of our flags. +#define FLAG_MODE_DECLARE +#include "src/flags/flag-definitions.h" // NOLINT + +// The global list of all flags. +class V8_EXPORT_PRIVATE FlagList { + public: + // The list of all flags with a value different from the default + // and their values. The format of the list is like the format of the + // argv array passed to the main function, e.g. + // ("--prof", "--log-file", "v8.prof", "--nolazy"). + // + // The caller is responsible for disposing the list, as well + // as every element of it. + static std::vector<const char*>* argv(); + + // Set the flag values by parsing the command line. If remove_flags is + // set, the recognized flags and associated values are removed from (argc, + // argv) and only unknown arguments remain. Returns 0 if no error occurred. + // Otherwise, returns the argv index > 0 for the argument where an error + // occurred. In that case, (argc, argv) will remain unchanged independent of + // the remove_flags value, and no assumptions about flag settings should be + // made. + // + // The following syntax for flags is accepted (both '-' and '--' are ok): + // + // --flag (bool flags only) + // --no-flag (bool flags only) + // --flag=value (non-bool flags only, no spaces around '=') + // --flag value (non-bool flags only) + // -- (capture all remaining args in JavaScript) + static int SetFlagsFromCommandLine(int* argc, char** argv, bool remove_flags); + + // Set the flag values by parsing the string str. Splits string into argc + // substrings argv[], each of which consisting of non-white-space chars, + // and then calls SetFlagsFromCommandLine() and returns its result. + static int SetFlagsFromString(const char* str, size_t len); + + // Reset all flags to their default value. + static void ResetAllFlags(); + + // Print help to stdout with flags, types, and default values. + static void PrintHelp(); + + // Set flags as consequence of being implied by another flag. + static void EnforceFlagImplications(); + + // Hash of flags (to quickly determine mismatching flag expectations). + // This hash is calculated during V8::Initialize and cached. + static uint32_t Hash(); +}; + +} // namespace internal +} // namespace v8 + +#endif // V8_FLAGS_FLAGS_H_ |