// 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: #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) extern ctype FLAG_##nam; #define FLAG_READONLY(ftype, ctype, nam, def, cmt) \ static ctype const 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) #define FLAG_FULL(ftype, ctype, nam, def, cmt) ctype FLAG_##nam = def; // 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 ctype const 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_NEG_VALUE_IMPLICATION(whenflag, thenflag, value) \ if (!FLAG_##whenflag) FLAG_##thenflag = value; #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_NEG_VALUE_IMPLICATION #define DEFINE_NEG_VALUE_IMPLICATION(whenflag, thenflag, value) #endif #define COMMA , #ifdef FLAG_MODE_DECLARE // Structure used to hold a collection of arguments to the JavaScript code. struct JSArguments { public: inline const char*& operator[](int idx) const { return argv[idx]; } static JSArguments Create(int argc, const char** argv) { JSArguments args; args.argc = argc; args.argv = argv; return args; } int argc; const char** argv; }; 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; }; #endif #ifdef DEBUG #define DEBUG_BOOL true #else #define DEBUG_BOOL false #endif #if (defined CAN_USE_VFP3_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE) #define ENABLE_VFP3_DEFAULT true #else #define ENABLE_VFP3_DEFAULT false #endif #if (defined CAN_USE_ARMV7_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE) #define ENABLE_ARMV7_DEFAULT true #else #define ENABLE_ARMV7_DEFAULT false #endif #if (defined CAN_USE_ARMV8_INSTRUCTIONS) || !(defined ARM_TEST_NO_FEATURE_PROBE) #define ENABLE_ARMV8_DEFAULT true #else #define ENABLE_ARMV8_DEFAULT false #endif #if (defined CAN_USE_VFP32DREGS) || !(defined ARM_TEST_NO_FEATURE_PROBE) #define ENABLE_32DREGS_DEFAULT true #else #define ENABLE_32DREGS_DEFAULT false #endif #if (defined CAN_USE_NEON) || !(defined ARM_TEST_NO_FEATURE_PROBE) # define ENABLE_NEON_DEFAULT true #else # define ENABLE_NEON_DEFAULT false #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_FLOAT(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt) #define DEFINE_STRING(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt) #define DEFINE_ARGS(nam, cmt) FLAG(ARGS, JSArguments, nam, {0 COMMA NULL}, 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_STRING(alias, nam) \ FLAG_ALIAS(STRING, const char*, alias, nam) #define DEFINE_ALIAS_ARGS(alias, nam) FLAG_ALIAS(ARGS, JSArguments, alias, nam) // // Flags in all modes. // #define FLAG FLAG_FULL DEFINE_BOOL(experimental_extras, false, "enable code compiled in via v8_experimental_extra_library_files") // 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) DEFINE_BOOL(promise_extra, true, "additional V8 Promise functions") // Removing extra Promise functions is staged DEFINE_NEG_IMPLICATION(harmony, promise_extra) // Activate on ClusterFuzz. DEFINE_IMPLICATION(es_staging, harmony_regexp_lookbehind) DEFINE_IMPLICATION(es_staging, move_object_start) // Features that are still work in progress (behind individual flags). #define HARMONY_INPROGRESS(V) \ V(harmony_explicit_tailcalls, "harmony explicit tail calls") \ V(harmony_function_sent, "harmony function.sent") \ V(harmony_sharedarraybuffer, "harmony sharedarraybuffer") \ V(harmony_simd, "harmony simd") \ V(harmony_do_expressions, "harmony do-expressions") \ V(harmony_for_in, "harmony for-in syntax") \ V(harmony_regexp_property, "harmony unicode regexp property classes") \ V(harmony_string_padding, "harmony String-padding methods") // Features that are complete (but still behind --harmony/es-staging flag). #define HARMONY_STAGED(V) \ V(harmony_regexp_lookbehind, "harmony regexp lookbehind") \ V(harmony_tailcalls, "harmony tail calls") \ V(harmony_object_values_entries, "harmony Object.values / Object.entries") \ V(harmony_object_own_property_descriptors, \ "harmony Object.getOwnPropertyDescriptors()") // Features that are shipping (turned on by default, but internal flag remains). #define HARMONY_SHIPPING(V) \ V(harmony_array_prototype_values, "harmony Array.prototype.values") \ V(harmony_function_name, "harmony Function name inference") \ V(harmony_instanceof, "harmony instanceof support") \ V(harmony_iterator_close, "harmony iterator finalization") \ V(harmony_unicode_regexps, "harmony unicode regexps") \ V(harmony_regexp_exec, "harmony RegExp exec override behavior") \ V(harmony_regexp_subclass, "harmony regexp subclassing") \ V(harmony_restrictive_declarations, \ "harmony limitations on sloppy mode function declarations") \ V(harmony_species, "harmony Symbol.species") \ V(harmony_exponentiation_operator, "harmony exponentiation operator `**`") // 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 // Flags for experimental implementation features. DEFINE_BOOL(compiled_keyed_generic_loads, false, "use optimizing compiler to generate keyed generic load stubs") 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_BOOL(harmony_instanceof_opt, true, "optimize ES6 instanceof support") 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(smi_binop, true, "support smi representation in binary operations") // Flags for optimization types. 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) // Flags for data representation optimizations DEFINE_BOOL(unbox_double_arrays, true, "automatically unbox arrays of doubles") DEFINE_BOOL(string_slices, true, "use string slices") // Flags for Ignition. DEFINE_BOOL(ignition, false, "use ignition interpreter") DEFINE_BOOL(ignition_eager, true, "eagerly compile and parse with ignition") DEFINE_BOOL(ignition_generators, false, "enable experimental ignition support for generators") DEFINE_STRING(ignition_filter, "*", "filter for ignition interpreter") DEFINE_BOOL(print_bytecode, false, "print bytecode generated by ignition interpreter") DEFINE_BOOL(trace_ignition, false, "trace the bytecodes executed by the ignition interpreter") 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, "v8.ignition_dispatches_table.json", "the file to which the bytecode handler dispatch table is " "written") // Flags for Crankshaft. DEFINE_BOOL(crankshaft, true, "use crankshaft") DEFINE_STRING(hydrogen_filter, "*", "optimization filter") DEFINE_BOOL(use_gvn, true, "use hydrogen global value numbering") DEFINE_INT(gvn_iterations, 3, "maximum number of GVN fix-point iterations") DEFINE_BOOL(use_canonicalizing, true, "use hydrogen instruction canonicalizing") DEFINE_BOOL(use_inlining, true, "use function inlining") DEFINE_BOOL(use_escape_analysis, true, "use hydrogen escape analysis") DEFINE_BOOL(use_allocation_folding, true, "use allocation folding") DEFINE_BOOL(use_local_allocation_folding, false, "only fold in basic blocks") DEFINE_BOOL(use_write_barrier_elimination, true, "eliminate write barriers targeting allocations in optimized code") DEFINE_INT(max_inlining_levels, 5, "maximum number of inlining levels") DEFINE_INT(max_inlined_source_size, 600, "maximum source size in bytes considered for a single inlining") DEFINE_INT(max_inlined_nodes, 196, "maximum number of AST nodes considered for a single inlining") DEFINE_INT(max_inlined_nodes_cumulative, 400, "maximum cumulative number of AST nodes considered for inlining") DEFINE_BOOL(loop_invariant_code_motion, true, "loop invariant code motion") DEFINE_BOOL(fast_math, true, "faster (but maybe less accurate) math functions") DEFINE_BOOL(collect_megamorphic_maps_from_stub_cache, false, "crankshaft harvests type feedback from stub cache") DEFINE_BOOL(hydrogen_stats, false, "print statistics for hydrogen") DEFINE_BOOL(trace_check_elimination, false, "trace check elimination phase") DEFINE_BOOL(trace_environment_liveness, false, "trace liveness of local variable slots") DEFINE_BOOL(trace_hydrogen, false, "trace generated hydrogen to file") DEFINE_STRING(trace_hydrogen_filter, "*", "hydrogen tracing filter") DEFINE_BOOL(trace_hydrogen_stubs, false, "trace generated hydrogen for stubs") DEFINE_STRING(trace_hydrogen_file, NULL, "trace hydrogen to given file name") DEFINE_STRING(trace_phase, "HLZ", "trace generated IR for specified phases") DEFINE_BOOL(trace_inlining, false, "trace inlining decisions") DEFINE_BOOL(trace_load_elimination, false, "trace load elimination") DEFINE_BOOL(trace_store_elimination, false, "trace store elimination") DEFINE_BOOL(trace_alloc, false, "trace register allocator") DEFINE_BOOL(trace_all_uses, false, "trace all use positions") DEFINE_BOOL(trace_range, false, "trace range analysis") DEFINE_BOOL(trace_gvn, false, "trace global value numbering") DEFINE_BOOL(trace_representation, false, "trace representation types") DEFINE_BOOL(trace_removable_simulates, false, "trace removable simulates") DEFINE_BOOL(trace_escape_analysis, false, "trace hydrogen escape analysis") DEFINE_BOOL(trace_allocation_folding, false, "trace allocation folding") 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") DEFINE_BOOL(stress_pointer_maps, false, "pointer map for every instruction") DEFINE_BOOL(stress_environments, false, "environment for every instruction") DEFINE_INT(deopt_every_n_times, 0, "deoptimize every n times a deopt point is passed") DEFINE_INT(deopt_every_n_garbage_collections, 0, "deoptimize every n garbage collections") DEFINE_BOOL(print_deopt_stress, false, "print number of possible deopt points") DEFINE_BOOL(trap_on_deopt, false, "put a break point before deoptimizing") DEFINE_BOOL(trap_on_stub_deopt, false, "put a break point before deoptimizing a stub") DEFINE_BOOL(deoptimize_uncommon_cases, true, "deoptimize uncommon cases") DEFINE_BOOL(polymorphic_inlining, true, "polymorphic inlining") DEFINE_BOOL(use_osr, true, "use on-stack replacement") DEFINE_BOOL(array_bounds_checks_elimination, true, "perform array bounds checks elimination") DEFINE_BOOL(trace_bce, false, "trace array bounds check elimination") DEFINE_BOOL(array_index_dehoisting, true, "perform array index dehoisting") DEFINE_BOOL(analyze_environment_liveness, true, "analyze liveness of environment slots and zap dead values") DEFINE_BOOL(load_elimination, true, "use load elimination") DEFINE_BOOL(check_elimination, true, "use check elimination") DEFINE_BOOL(store_elimination, false, "use store elimination") DEFINE_BOOL(dead_code_elimination, true, "use dead code elimination") DEFINE_BOOL(fold_constants, true, "use constant folding") DEFINE_BOOL(trace_dead_code_elimination, false, "trace dead code elimination") DEFINE_BOOL(unreachable_code_elimination, true, "eliminate unreachable code") DEFINE_BOOL(trace_osr, false, "trace on-stack replacement") DEFINE_INT(stress_runs, 0, "number of stress runs") DEFINE_BOOL(lookup_sample_by_shared, true, "when picking a function to optimize, watch for shared function " "info, not JSFunction itself") DEFINE_BOOL(flush_optimized_code_cache, false, "flushes the cache of optimized code for closures on every GC") DEFINE_BOOL(inline_construct, true, "inline constructor calls") DEFINE_BOOL(inline_arguments, true, "inline functions with arguments object") DEFINE_BOOL(inline_accessors, true, "inline JavaScript accessors") DEFINE_INT(escape_analysis_iterations, 2, "maximum number of escape analysis fix-point iterations") 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(omit_map_checks_for_leaf_maps, true, "do not emit check maps for constant values that have a leaf map, " "deoptimize the optimized code if the layout of the maps changes.") // Flags for TurboFan. DEFINE_BOOL(turbo, false, "enable TurboFan compiler") DEFINE_IMPLICATION(turbo, turbo_asm_deoptimization) DEFINE_BOOL(turbo_shipping, true, "enable TurboFan compiler on subset") DEFINE_BOOL(turbo_greedy_regalloc, false, "use the greedy register allocator") DEFINE_BOOL(turbo_sp_frame_access, false, "use stack pointer-relative access to frame wherever possible") DEFINE_BOOL(turbo_preprocess_ranges, true, "run pre-register allocation heuristics") DEFINE_BOOL(turbo_loop_stackcheck, true, "enable stack checks in loops") DEFINE_STRING(turbo_filter, "~~", "optimization filter for TurboFan compiler") DEFINE_BOOL(trace_turbo, false, "trace generated TurboFan IR") DEFINE_BOOL(trace_turbo_graph, false, "trace generated TurboFan graphs") DEFINE_IMPLICATION(trace_turbo_graph, trace_turbo) DEFINE_STRING(trace_turbo_cfg_file, NULL, "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_jt, false, "trace TurboFan's jump threading") DEFINE_BOOL(trace_turbo_ceq, false, "trace TurboFan's control equivalence") DEFINE_BOOL(turbo_asm, true, "enable TurboFan for asm.js code") DEFINE_BOOL(turbo_asm_deoptimization, false, "enable deoptimization in TurboFan for asm.js code") DEFINE_BOOL(turbo_verify, DEBUG_BOOL, "verify TurboFan graphs at each phase") DEFINE_BOOL(turbo_stats, false, "print TurboFan statistics") DEFINE_BOOL(turbo_splitting, true, "split nodes during scheduling in TurboFan") DEFINE_BOOL(turbo_source_positions, false, "track source code positions when building TurboFan IR") DEFINE_IMPLICATION(trace_turbo, turbo_source_positions) DEFINE_BOOL(function_context_specialization, false, "enable function context specialization in TurboFan") DEFINE_BOOL(native_context_specialization, true, "enable native context specialization in TurboFan") DEFINE_BOOL(turbo_inlining, true, "enable inlining in TurboFan") DEFINE_BOOL(trace_turbo_inlining, false, "trace TurboFan inlining") DEFINE_BOOL(loop_assignment_analysis, true, "perform loop assignment analysis") 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_osr, true, "enable OSR in TurboFan") DEFINE_BOOL(turbo_stress_loop_peeling, false, "stress loop peeling optimization") DEFINE_BOOL(turbo_cf_optimization, true, "optimize control flow in TurboFan") DEFINE_BOOL(turbo_frame_elision, true, "elide frames in TurboFan") DEFINE_BOOL(turbo_cache_shared_code, true, "cache context-independent code") DEFINE_BOOL(turbo_preserve_shared_code, false, "keep context-independent code") DEFINE_BOOL(experimental_turbo_escape, false, "enable escape analysis") 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") // Flags for native WebAssembly. DEFINE_BOOL(expose_wasm, false, "expose WASM interface to JavaScript") DEFINE_BOOL(trace_wasm_encoder, false, "trace encoding of wasm code") DEFINE_BOOL(trace_wasm_decoder, false, "trace decoding of wasm code") DEFINE_BOOL(trace_wasm_decode_time, false, "trace decoding time of wasm code") DEFINE_BOOL(trace_wasm_compiler, false, "trace compiling 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_INT(skip_compiling_wasm_funcs, 0, "start compiling at function N") DEFINE_BOOL(wasm_break_on_decoder_error, false, "debug break when wasm decoder encounters an error") DEFINE_BOOL(wasm_loop_assignment_analysis, true, "perform loop assignment analysis for WASM") DEFINE_BOOL(enable_simd_asmjs, false, "enable SIMD.js in asm.js stdlib") DEFINE_BOOL(dump_wasm_module, false, "dump WASM module bytes") DEFINE_STRING(dump_wasm_module_path, NULL, "directory to dump wasm modules to") DEFINE_INT(typed_array_max_size_in_heap, 64, "threshold for in-heap typed array") // Profiler flags. DEFINE_INT(frame_count, 1, "number of stack frames inspected by the profiler") // 0x1800 fits in the immediate field of an ARM instruction. DEFINE_INT(interrupt_budget, 0x1800, "execution budget before interrupt is triggered") DEFINE_INT(type_info_threshold, 25, "percentage of ICs that must have type info to allow optimization") DEFINE_INT(generic_ic_threshold, 30, "max percentage of megamorphic/generic ICs to allow optimization") DEFINE_INT(self_opt_count, 130, "call count before self-optimization") DEFINE_BOOL(trace_opt_verbose, false, "extra verbose compilation tracing") DEFINE_IMPLICATION(trace_opt_verbose, trace_opt) // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc DEFINE_BOOL(debug_code, false, "generate extra code (assertions) for debugging") DEFINE_BOOL(code_comments, false, "emit comments in code disassembly") DEFINE_BOOL(enable_sse3, true, "enable use of SSE3 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_BOOL(enable_vfp3, ENABLE_VFP3_DEFAULT, "enable use of VFP3 instructions if available") DEFINE_BOOL(enable_armv7, ENABLE_ARMV7_DEFAULT, "enable use of ARMv7 instructions if available (ARM only)") DEFINE_BOOL(enable_armv8, ENABLE_ARMV8_DEFAULT, "enable use of ARMv8 instructions if available (ARM 32-bit only)") DEFINE_BOOL(enable_neon, ENABLE_NEON_DEFAULT, "enable use of NEON instructions if available (ARM only)") DEFINE_BOOL(enable_sudiv, true, "enable use of SDIV and UDIV instructions if available (ARM only)") DEFINE_BOOL(enable_mls, true, "enable use of MLS instructions if available (ARM only)") DEFINE_BOOL(enable_movw_movt, false, "enable loading 32-bit constant by means of movw/movt " "instruction pairs (ARM only)") DEFINE_BOOL(enable_unaligned_accesses, true, "enable unaligned accesses for ARMv7 (ARM only)") DEFINE_BOOL(enable_32dregs, ENABLE_32DREGS_DEFAULT, "enable use of d16-d31 registers on ARM - this requires VFP3") DEFINE_BOOL(enable_vldr_imm, false, "enable use of constant pools for double immediate (ARM only)") 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_IMPLICATION(enable_armv8, enable_vfp3) DEFINE_IMPLICATION(enable_armv8, enable_neon) DEFINE_IMPLICATION(enable_armv8, enable_32dregs) DEFINE_IMPLICATION(enable_armv8, enable_sudiv) DEFINE_IMPLICATION(enable_armv8, enable_mls) // bootstrapper.cc DEFINE_STRING(expose_natives_as, NULL, "expose natives in global object") DEFINE_STRING(expose_debug_as, NULL, "expose debug in global object") DEFINE_BOOL(expose_free_buffer, false, "expose freeBuffer extension") DEFINE_BOOL(expose_gc, false, "expose gc extension") DEFINE_STRING(expose_gc_as, NULL, "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(disable_native_files, false, "disable builtin natives files") // builtins-ia32.cc DEFINE_BOOL(inline_new, true, "use fast inline allocation") // codegen-ia32.cc / codegen-arm.cc DEFINE_BOOL(trace_codegen, false, "print name of functions for which code is generated") DEFINE_BOOL(trace, false, "trace function calls") DEFINE_BOOL(mask_constants_with_cookie, true, "use random jit cookie to mask large constants") // codegen.cc DEFINE_BOOL(lazy, true, "use lazy compilation") DEFINE_BOOL(trace_opt, false, "trace lazy optimization") DEFINE_BOOL(trace_opt_stats, false, "trace lazy optimization statistics") DEFINE_BOOL(opt, true, "use adaptive optimizations") 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_deopt, false, "trace optimize function deoptimization") DEFINE_BOOL(trace_stub_failures, false, "trace deoptimization of generated code stubs") DEFINE_BOOL(serialize_toplevel, true, "enable caching of toplevel scripts") DEFINE_BOOL(serialize_eager, false, "compile eagerly when caching scripts") DEFINE_BOOL(serialize_age_code, false, "pre age code in the code cache") DEFINE_BOOL(trace_serializer, false, "print code serializer trace") // compiler.cc DEFINE_INT(min_preparse_length, 1024, "minimum length for automatic enable preparsing") DEFINE_INT(max_opt_count, 10, "maximum number of optimization attempts before giving up.") // compilation-cache.cc DEFINE_BOOL(compilation_cache, true, "enable compilation cache") DEFINE_BOOL(cache_prototype_transitions, true, "cache prototype transitions") // cpu-profiler.cc DEFINE_INT(cpu_profiler_sampling_interval, 1000, "CPU profiler sampling interval in microseconds") // Array abuse tracing DEFINE_BOOL(trace_js_array_abuse, false, "trace out-of-bounds accesses to JS arrays") DEFINE_BOOL(trace_external_array_abuse, false, "trace out-of-bounds-accesses to external arrays") DEFINE_BOOL(trace_array_abuse, false, "trace out-of-bounds accesses to all arrays") DEFINE_IMPLICATION(trace_array_abuse, trace_js_array_abuse) DEFINE_IMPLICATION(trace_array_abuse, trace_external_array_abuse) // debugger DEFINE_BOOL(trace_debug_json, false, "trace debugging JSON request/response") DEFINE_BOOL(enable_liveedit, true, "enable liveedit experimental feature") DEFINE_BOOL(hard_abort, true, "abort by crashing") // 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.") // full-codegen.cc DEFINE_BOOL(always_inline_smi_code, false, "always inline smi code in non-opt code") DEFINE_BOOL(verify_operand_stack_depth, false, "emit debug code that verifies the static tracking of the operand " "stack depth") // heap.cc DEFINE_INT(min_semi_space_size, 0, "min size of a semi-space (in MBytes), the new space consists of two" "semi-spaces") DEFINE_INT(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_INT(max_old_space_size, 0, "max size of the old space (in Mbytes)") DEFINE_INT(initial_old_space_size, 0, "initial old space size (in Mbytes)") DEFINE_INT(max_executable_size, 0, "max size of executable memory (in Mbytes)") DEFINE_BOOL(gc_global, false, "always perform global GCs") DEFINE_INT(gc_interval, -1, "garbage collect after allocations") DEFINE_INT(retain_maps_for_n_gc, 2, "keeps maps alive for 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(print_cumulative_gc_stat, false, "print cumulative GC statistics in name=value format on exit") DEFINE_BOOL(print_max_heap_committed, false, "print statistics of the maximum memory committed for the heap " "in name=value format on exit") DEFINE_BOOL(trace_gc_verbose, false, "print more details following each garbage collection") DEFINE_INT(trace_allocation_stack_interval, -1, "print stack trace after free-list allocations") 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(weak_embedded_maps_in_optimized_code, true, "make maps embedded in optimized code weak") DEFINE_BOOL(weak_embedded_objects_in_optimized_code, true, "make objects embedded in optimized code weak") DEFINE_BOOL(flush_code, true, "flush code that we expect not to use again") DEFINE_BOOL(trace_code_flushing, false, "trace code flushing progress") DEFINE_BOOL(age_code, true, "track un-executed functions to age code and flush only " "old code (required for code flushing)") DEFINE_BOOL(incremental_marking, true, "use incremental marking") DEFINE_INT(min_progress_during_incremental_marking_finalization, 32, "keep finalizing incremental marking as long as we discover at " "least this many unmarked objects") DEFINE_INT(max_incremental_marking_finalization_rounds, 3, "at most try this many times to finalize incremental marking") DEFINE_BOOL(black_allocation, true, "use black allocation") 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(trace_incremental_marking, false, "trace progress of the incremental marking") 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_IMPLICATION(trace_gc_object_stats, track_gc_object_stats) 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") #endif DEFINE_BOOL(move_object_start, true, "enable moving of object starts") DEFINE_BOOL(memory_reducer, true, "use memory reducer") DEFINE_BOOL(scavenge_reclaim_unmodified_objects, true, "remove unmodified and unreferenced objects") DEFINE_INT(heap_growing_percent, 0, "specifies heap growing factor as (1 + heap_growing_percent/100)") // counters.cc DEFINE_INT(histogram_interval, 600000, "time interval in ms for aggregating memory histograms") // global-handles.cc DEFINE_BOOL(trace_object_groups, false, "print object groups detected during each garbage collection") // heap-snapshot-generator.cc DEFINE_BOOL(heap_profiler_trace_objects, false, "Dump heap object allocations/movements/size_updates") // 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(use_ic, true, "use inline caching") DEFINE_BOOL(trace_ic, false, "trace inline cache state transitions") // macro-assembler-ia32.cc DEFINE_BOOL(native_code_counters, false, "generate extra code for manipulating stats counters") // mark-compact.cc 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(cleanup_code_caches_at_gc, true, "Flush inline caches prior to mark compact collection and " "flush code caches in maps during mark compact cycle.") DEFINE_BOOL(use_marking_progress_bar, true, "Use a progress bar to scan large objects in increments when " "incremental marking is active.") DEFINE_BOOL(zap_code_space, DEBUG_BOOL, "Zap free memory in code space with 0xCC while sweeping.") DEFINE_INT(random_seed, 0, "Default seed for initializing random generator " "(0, the default, means to use system random).") // objects.cc DEFINE_BOOL(trace_weak_arrays, false, "Trace WeakFixedArray usage") DEFINE_BOOL(track_prototype_users, false, "Keep track of which maps refer to a given prototype object") DEFINE_BOOL(trace_prototype_users, false, "Trace updates to prototype user tracking") DEFINE_BOOL(eliminate_prototype_chain_checks, true, "Collapse prototype chain checks into single-cell checks") DEFINE_IMPLICATION(eliminate_prototype_chain_checks, track_prototype_users) DEFINE_BOOL(use_verbose_printer, true, "allows verbose printing") DEFINE_BOOL(trace_for_in_enumerate, false, "Trace for-in enumerate slow-paths") #if TRACE_MAPS DEFINE_BOOL(trace_maps, false, "trace map creation") #endif // parser.cc DEFINE_BOOL(allow_natives_syntax, false, "allow natives syntax") DEFINE_BOOL(trace_parse, false, "trace parsing and preparsing") // 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_regs_modified, true, "When logging register values, only print modified registers.") 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(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(randomize_hashes, true, "randomize hashes to avoid predictable hash collisions " "(with snapshots this option cannot override the baked-in seed)") DEFINE_INT(hash_seed, 0, "Fixed seed to use to hash property keys (0 means random)" "(with snapshots this option cannot override the baked-in seed)") // runtime.cc DEFINE_BOOL(runtime_call_stats, false, "report runtime call counts and times") // snapshot-common.cc DEFINE_BOOL(profile_deserialization, false, "Print the time it takes to deserialize the snapshot.") DEFINE_BOOL(serialization_statistics, false, "Collect statistics on serialized objects.") // Regexp DEFINE_BOOL(regexp_optimization, true, "generate optimized 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") #ifdef _WIN32 DEFINE_STRING(testing_serialization_file, "C:\\Windows\\Temp\\serdes", "file in which to testing_serialize heap") #else DEFINE_STRING(testing_serialization_file, "/tmp/serdes", "file in which to serialize heap") #endif // mksnapshot.cc DEFINE_STRING(startup_src, NULL, "Write V8 startup as C++ src. (mksnapshot only)") DEFINE_STRING(startup_blob, NULL, "Write V8 startup blob file. (mksnapshot only)") // code-stubs-hydrogen.cc DEFINE_BOOL(profile_hydrogen_code_stub_compilation, false, "Print the time it takes to lazily compile hydrogen code stubs.") DEFINE_BOOL(predictable, false, "enable predictable mode") DEFINE_NEG_IMPLICATION(predictable, concurrent_recompilation) DEFINE_NEG_IMPLICATION(predictable, concurrent_sweeping) DEFINE_NEG_IMPLICATION(predictable, parallel_compaction) DEFINE_NEG_IMPLICATION(predictable, memory_reducer) // mark-compact.cc 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(manual_evacuation_candidates_selection, false, "Test mode only flag. It allows an unit test to select evacuation " "candidates pages (requires --stress_compaction).") // api.cc DEFINE_INT(external_allocation_limit_incremental_time, 1, "Time spent in incremental marking steps (in ms) once the external " "allocation limit is reached") DEFINE_BOOL(disable_old_api_accessors, false, "Disable old-style API accessors whose setters trigger through the " "prototype chain") // // Dev shell flags // DEFINE_BOOL(help, false, "Print usage message, including flags, on console") DEFINE_BOOL(dump_counters, false, "Dump counters on exit") DEFINE_STRING(map_counters, "", "Map counters to a file") DEFINE_ARGS(js_arguments, "Pass all remaining arguments to the script. Alias for \"--\".") // // 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, false, "enable asserts that are slow to execute") #endif // codegen-ia32.cc / codegen-arm.cc / macro-assembler-*.cc DEFINE_BOOL(print_source, false, "pretty print source code") DEFINE_BOOL(print_builtin_source, false, "pretty print source code for builtins") DEFINE_BOOL(print_ast, false, "print source AST") DEFINE_BOOL(print_builtin_ast, false, "print source AST for builtins") DEFINE_BOOL(trap_on_abort, false, "replace aborts by breakpoints") // compiler.cc DEFINE_BOOL(print_builtin_scopes, false, "print scopes for builtins") 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(heap_stats, false, "report heap statistics before and after GC") 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(print_turbo_replay, false, "print C++ code to recreate TurboFan graphs") DEFINE_BOOL(trace_turbo_escape, false, "enable tracing in escape analysis") // objects.cc 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_live_bytes, false, "trace incrementing and resetting of live bytes") 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") // // 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_gc, false, "Log heap samples on garbage collection for the hp2ps tool.") DEFINE_BOOL(log_handles, false, "Log global handle events.") DEFINE_BOOL(log_suspect, false, "Log suspect operations.") DEFINE_BOOL(prof, false, "Log statistical profiling information (implies --log-code).") 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_BOOL(log_regexp, false, "Log regular expression execution.") 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) DEFINE_BOOL(perf_prof_debug_info, false, "Enable debug info for perf linux profiler (experimental).") 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_BOOL(log_timer_events, false, "Time events including external callbacks.") DEFINE_IMPLICATION(log_timer_events, log_internal_timer_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--.asm") DEFINE_STRING(redirect_code_traces_to, NULL, "output deopt information and disassembly into the given file") DEFINE_BOOL(hydrogen_track_positions, false, "track source code positions when building IR") // // 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") // code-stubs.cc DEFINE_BOOL(print_code_stubs, false, "print code stubs") DEFINE_BOOL(test_secondary_stub_cache, false, "test secondary stub cache by disabling the primary one") DEFINE_BOOL(test_primary_stub_cache, false, "test primary stub cache by disabling the secondary one") // codegen-ia32.cc / codegen-arm.cc DEFINE_BOOL(print_code, false, "print generated code") DEFINE_BOOL(print_opt_code, false, "print optimized code") DEFINE_BOOL(print_unopt_code, false, "print unoptimized code before " "printing optimized code based on it") DEFINE_BOOL(print_code_verbose, false, "print more information for code") DEFINE_BOOL(print_builtin_code, false, "print generated code 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_stubs) DEFINE_IMPLICATION(sodium, print_code) DEFINE_IMPLICATION(sodium, print_opt_code) DEFINE_IMPLICATION(sodium, hydrogen_track_positions) 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_unopt_code) DEFINE_IMPLICATION(print_all_code, print_code_verbose) DEFINE_IMPLICATION(print_all_code, print_builtin_code) DEFINE_IMPLICATION(print_all_code, print_code_stubs) DEFINE_IMPLICATION(print_all_code, code_comments) #ifdef DEBUG DEFINE_IMPLICATION(print_all_code, trace_codegen) #endif #endif // // VERIFY_PREDICTABLE related flags // #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 (ARM/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(global_var_shortcuts, false, "use ic-less global loads and stores") // Cleanup... #undef FLAG_FULL #undef FLAG_READONLY #undef FLAG #undef FLAG_ALIAS #undef DEFINE_BOOL #undef DEFINE_MAYBE_BOOL #undef DEFINE_INT #undef DEFINE_STRING #undef DEFINE_FLOAT #undef DEFINE_ARGS #undef DEFINE_IMPLICATION #undef DEFINE_NEG_IMPLICATION #undef DEFINE_NEG_VALUE_IMPLICATION #undef DEFINE_VALUE_IMPLICATION #undef DEFINE_ALIAS_BOOL #undef DEFINE_ALIAS_INT #undef DEFINE_ALIAS_STRING #undef DEFINE_ALIAS_FLOAT #undef DEFINE_ALIAS_ARGS #undef FLAG_MODE_DECLARE #undef FLAG_MODE_DEFINE #undef FLAG_MODE_DEFINE_DEFAULTS #undef FLAG_MODE_META #undef FLAG_MODE_DEFINE_IMPLICATIONS #undef COMMA