// Copyright 2012 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // 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: // 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_implication(whenflag, thenflag) \ if (FLAG_##whenflag) FLAG_##thenflag = true; #define DEFINE_neg_implication(whenflag, thenflag) \ if (FLAG_##whenflag) FLAG_##thenflag = false; #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_implication #define DEFINE_implication(whenflag, thenflag) #endif #ifndef DEFINE_neg_implication #define DEFINE_neg_implication(whenflag, thenflag) #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 #if (defined CAN_USE_VFP3_INSTRUCTIONS) || !(defined ARM_TEST) # define ENABLE_VFP3_DEFAULT true #else # define ENABLE_VFP3_DEFAULT false #endif #if (defined CAN_USE_ARMV7_INSTRUCTIONS) || !(defined ARM_TEST) # define ENABLE_ARMV7_DEFAULT true #else # define ENABLE_ARMV7_DEFAULT false #endif #if (defined CAN_USE_VFP32DREGS) || !(defined ARM_TEST) # define ENABLE_32DREGS_DEFAULT true #else # define ENABLE_32DREGS_DEFAULT false #endif #define DEFINE_bool(nam, def, cmt) FLAG(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 // Flags for language modes and experimental language features. DEFINE_bool(use_strict, false, "enforce strict mode") DEFINE_bool(es_staging, false, "enable upcoming ES6+ features") DEFINE_bool(harmony_typeof, false, "enable harmony semantics for typeof") DEFINE_bool(harmony_scoping, false, "enable harmony block scoping") DEFINE_bool(harmony_modules, false, "enable harmony modules (implies block scoping)") DEFINE_bool(harmony_symbols, false, "enable harmony symbols (a.k.a. private names)") DEFINE_bool(harmony_promises, false, "enable harmony promises") DEFINE_bool(harmony_proxies, false, "enable harmony proxies") DEFINE_bool(harmony_collections, false, "enable harmony collections (sets, maps, weak sets, weak maps)") DEFINE_bool(harmony_weak_collections, false, "enable only harmony weak collections (weak sets and maps)") DEFINE_bool(harmony_generators, false, "enable harmony generators") DEFINE_bool(harmony_iteration, false, "enable harmony iteration (for-of)") DEFINE_bool(harmony_numeric_literals, false, "enable harmony numeric literals (0o77, 0b11)") DEFINE_bool(harmony_strings, false, "enable harmony string") DEFINE_bool(harmony_arrays, false, "enable harmony arrays") DEFINE_bool(harmony_maths, false, "enable harmony math functions") DEFINE_bool(harmony, false, "enable all harmony features (except typeof)") DEFINE_implication(harmony, harmony_scoping) DEFINE_implication(harmony, harmony_modules) DEFINE_implication(harmony, harmony_symbols) DEFINE_implication(harmony, harmony_proxies) DEFINE_implication(harmony, harmony_collections) DEFINE_implication(harmony, harmony_generators) DEFINE_implication(harmony, harmony_iteration) DEFINE_implication(harmony, harmony_numeric_literals) DEFINE_implication(harmony, harmony_strings) DEFINE_implication(harmony, harmony_arrays) DEFINE_implication(harmony_collections, harmony_weak_collections) DEFINE_implication(harmony_promises, harmony_weak_collections) DEFINE_implication(harmony_modules, harmony_scoping) DEFINE_implication(harmony, es_staging) DEFINE_implication(es_staging, harmony_maths) DEFINE_implication(es_staging, harmony_promises) DEFINE_implication(es_staging, harmony_weak_collections) // Flags for experimental implementation features. DEFINE_bool(packed_arrays, true, "optimizes arrays that have no holes") DEFINE_bool(smi_only_arrays, true, "tracks arrays with only smi values") DEFINE_bool(compiled_keyed_dictionary_loads, true, "use optimizing compiler to generate keyed dictionary load stubs") DEFINE_bool(clever_optimizations, true, "Optimize object size, Array shift, DOM strings and string +") DEFINE_bool(pretenuring, true, "allocate objects in old space") // TODO(hpayer): We will remove this flag as soon as we have pretenuring // support for specific allocation sites. DEFINE_bool(pretenuring_call_new, false, "pretenure call new") DEFINE_bool(allocation_site_pretenuring, true, "pretenure with allocation sites") 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(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.") // 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 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, true, "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_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_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_bounds_checks_hoisting, false, "perform array bounds checks hoisting") 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(optimize_closures, true, "optimize closures") DEFINE_bool(lookup_sample_by_shared, true, "when picking a function to optimize, watch for shared function " "info, not JSFunction itself") DEFINE_bool(cache_optimized_code, true, "cache optimized code for closures") DEFINE_bool(flush_optimized_code_cache, true, "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(optimize_for_in, true, "optimize functions containing for-in loops") DEFINE_bool(opt_safe_uint32_operations, true, "allow uint32 values on optimize frames if they are used only in " "safe operations") 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_osr, false, "concurrent on-stack replacement") DEFINE_implication(concurrent_osr, concurrent_recompilation) 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.") // 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(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_sse2, true, "enable use of SSE2 instructions if available") 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_cmov, true, "enable use of CMOV instruction if available") DEFINE_bool(enable_sahf, true, "enable use of SAHF instruction if available (X64 only)") 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_neon, true, "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_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 only)") // 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") // compiler.cc DEFINE_int(min_preparse_length, 1024, "minimum length for automatic enable preparsing") DEFINE_bool(always_full_compiler, false, "try to use the dedicated run-once backend for all code") 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") // debug.cc DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response") 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) DEFINE_bool(debugger_auto_break, true, "automatically set the debug break flag when debugger commands are " "in the queue") DEFINE_bool(enable_liveedit, true, "enable liveedit experimental feature") DEFINE_bool(hard_abort, true, "abort by crashing") // execution.cc // Slightly less than 1MB on 64-bit, since Windows' default stack size for // the main execution thread is 1MB for both 32 and 64-bit. DEFINE_int(stack_size, kPointerSize * 123, "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") // heap.cc DEFINE_int(max_new_space_size, 0, "max size of the new generation (in kBytes)") DEFINE_int(max_old_space_size, 0, "max size of the old generation (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_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(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_bool(trace_fragmentation, false, "report fragmentation for old pointer and data pages") DEFINE_bool(trace_external_memory, false, "print amount of external allocated memory after each time " "it is adjusted.") DEFINE_bool(collect_maps, true, "garbage collect maps from which no objects can be reached") 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 (during full gc)") DEFINE_bool(flush_code_incrementally, true, "flush code that we expect not to use again (incrementally)") 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_bool(incremental_marking_steps, true, "do incremental marking steps") 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(parallel_sweeping, true, "enable parallel sweeping") DEFINE_bool(concurrent_sweeping, false, "enable concurrent sweeping") DEFINE_int(sweeper_threads, 0, "number of parallel and concurrent sweeping threads") DEFINE_bool(job_based_sweeping, false, "enable job based sweeping") #ifdef VERIFY_HEAP DEFINE_bool(verify_heap, false, "verify heap pointers before and after GC") #endif // heap-snapshot-generator.cc DEFINE_bool(heap_profiler_trace_objects, false, "Dump heap object allocations/movements/size_updates") // 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") // 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(lazy_sweeping, true, "Use lazy sweeping for old pointer and data spaces") DEFINE_bool(never_compact, false, "Never perform compaction on full GC - testing only") DEFINE_bool(compact_code_space, true, "Compact code space on full non-incremental collections") DEFINE_bool(incremental_code_compaction, true, "Compact code space on full incremental 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, true, "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(use_verbose_printer, true, "allows verbose printing") // 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") #ifdef V8_TARGET_ARCH_ARM64 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 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, true, "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)") // snapshot-common.cc DEFINE_bool(profile_deserialization, false, "Print the time it takes to deserialize the snapshot.") // 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(extra_code, NULL, "A filename with extra code to be included in" " the snapshot (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_osr) DEFINE_neg_implication(predictable, concurrent_sweeping) DEFINE_neg_implication(predictable, parallel_sweeping) // // Dev shell flags // DEFINE_bool(help, false, "Print usage message, including flags, on console") DEFINE_bool(dump_counters, false, "Dump counters on exit") #ifdef ENABLE_DEBUGGER_SUPPORT DEFINE_bool(debugger, false, "Enable JavaScript debugger") DEFINE_bool(remote_debugger, false, "Connect JavaScript debugger to the " "debugger agent in another process") DEFINE_bool(debugger_agent, false, "Enable debugger agent") DEFINE_int(debugger_port, 5858, "Port to use for remote debugging") #endif // ENABLE_DEBUGGER_SUPPORT DEFINE_string(map_counters, "", "Map counters to a file") DEFINE_args(js_arguments, "Pass all remaining arguments to the script. Alias for \"--\".") #if defined(WEBOS__) DEFINE_bool(debug_compile_events, false, "Enable debugger compile events") DEFINE_bool(debug_script_collected_events, false, "Enable debugger script collected events") #else DEFINE_bool(debug_compile_events, true, "Enable debugger compile events") DEFINE_bool(debug_script_collected_events, true, "Enable debugger script collected events") #endif // // GDB JIT integration flags. // DEFINE_bool(gdbjit, false, "enable GDBJIT interface (disables compacting GC)") 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") // 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)") // // Debug only flags // #undef FLAG #ifdef DEBUG #define FLAG FLAG_FULL #else #define FLAG FLAG_READONLY #endif // checks.cc #ifdef ENABLE_SLOW_ASSERTS 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_string(stop_at, "", "function name where to insert a breakpoint") 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_greedy, false, "perform GC prior to some allocations") 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(verify_native_context_separation, false, "verify that code holds on to at most one native context after GC") DEFINE_bool(print_handles, false, "report handles after GC") DEFINE_bool(print_global_handles, false, "report global handles after GC") // ic.cc DEFINE_bool(trace_ic, false, "trace inline cache state transitions") // interface.cc DEFINE_bool(print_interfaces, false, "print interfaces") DEFINE_bool(print_interface_details, false, "print interface inference details") DEFINE_int(print_interface_depth, 5, "depth for printing interfaces") // 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_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.") // // 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_runtime, false, "Activate runtime system %Log call.") 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_snapshot_positions, false, "log positions of (de)serialized objects in the snapshot.") DEFINE_bool(log_suspect, false, "Log suspect operations.") DEFINE_bool(prof, false, "Log statistical profiling information (implies --log-code).") 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_bool(perf_jit_prof, false, "Enable perf linux profiler (experimental annotate support).") 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 // // Read-only flags // #undef FLAG #define FLAG FLAG_READONLY // assembler-arm.h DEFINE_bool(enable_ool_constant_pool, V8_OOL_CONSTANT_POOL, "enable use of out-of-line constant pools (ARM only)") // 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_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