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>

1 files changed, 1558 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