// Copyright 2011 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; #define DEFINE_implication(whenflag, thenflag) // 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; #define FLAG_READONLY(ftype, ctype, nam, def, cmt) #define DEFINE_implication(whenflag, thenflag) // 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; #define FLAG_READONLY(ftype, ctype, nam, def, cmt) #define DEFINE_implication(whenflag, thenflag) // 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_READONLY(ftype, ctype, nam, def, cmt) #define DEFINE_implication(whenflag, thenflag) // We produce the code to set flags when it is implied by another flag. #elif defined(FLAG_MODE_DEFINE_IMPLICATIONS) #define FLAG_FULL(ftype, ctype, nam, def, cmt) #define FLAG_READONLY(ftype, ctype, nam, def, cmt) #define DEFINE_implication(whenflag, thenflag) \ if (FLAG_##whenflag) FLAG_##thenflag = true; #else #error No mode supplied when including flags.defs #endif #ifdef FLAG_MODE_DECLARE // Structure used to hold a collection of arguments to the JavaScript code. struct JSArguments { public: JSArguments(); JSArguments(int argc, const char** argv); int argc() const; const char** argv(); const char*& operator[](int idx); JSArguments& operator=(JSArguments args); private: int argc_; const char** argv_; }; #endif #define DEFINE_bool(nam, def, cmt) FLAG(BOOL, bool, nam, def, 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, def, cmt) FLAG(ARGS, JSArguments, nam, def, cmt) // // Flags in all modes. // #define FLAG FLAG_FULL // Flags for experimental language features. DEFINE_bool(harmony_typeof, false, "enable harmony semantics for typeof") DEFINE_bool(harmony_scoping, false, "enable harmony block scoping") DEFINE_bool(harmony_proxies, false, "enable harmony proxies") DEFINE_bool(harmony_collections, false, "enable harmony collections (sets, maps, and weak maps)") DEFINE_bool(harmony, false, "enable all harmony features (except typeof)") DEFINE_implication(harmony, harmony_scoping) DEFINE_implication(harmony, harmony_proxies) DEFINE_implication(harmony, harmony_collections) // Flags for experimental implementation features. DEFINE_bool(unbox_double_arrays, true, "automatically unbox arrays of doubles") DEFINE_bool(smi_only_arrays, false, "tracks arrays with only smi values") DEFINE_bool(string_slices, true, "use string slices") DEFINE_bool(clever_optimizations, true, "Optimize object size, Array shift, DOM strings and string +") // Flags for Crankshaft. DEFINE_bool(crankshaft, true, "use crankshaft") DEFINE_string(hydrogen_filter, "", "hydrogen use/trace filter") DEFINE_bool(use_hydrogen, true, "use generated hydrogen for compilation") DEFINE_bool(build_lithium, true, "use lithium chunk builder") DEFINE_bool(alloc_lithium, true, "use lithium register allocator") DEFINE_bool(use_lithium, true, "use lithium code generator") DEFINE_bool(use_range, true, "use hydrogen range analysis") DEFINE_bool(eliminate_dead_phis, true, "eliminate dead phis") DEFINE_bool(use_gvn, true, "use hydrogen global value numbering") DEFINE_bool(use_canonicalizing, true, "use hydrogen instruction canonicalizing") DEFINE_bool(use_inlining, true, "use function inlining") DEFINE_bool(limit_inlining, true, "limit code size growth from inlining") DEFINE_bool(eliminate_empty_blocks, true, "eliminate empty blocks") DEFINE_bool(loop_invariant_code_motion, true, "loop invariant code motion") 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_hydrogen, false, "trace generated hydrogen to file") DEFINE_bool(trace_inlining, false, "trace inlining decisions") 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(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_bool(trap_on_deopt, false, "put a break point before deoptimizing") 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(trace_osr, false, "trace on-stack replacement") DEFINE_int(stress_runs, 0, "number of stress runs") DEFINE_bool(optimize_closures, true, "optimize closures") // 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(peephole_optimization, true, "perform peephole optimizations in assembly code") 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_rdtsc, true, "enable use of RDTSC instruction if available") DEFINE_bool(enable_sahf, true, "enable use of SAHF instruction if available (X64 only)") DEFINE_bool(enable_vfp3, true, "enable use of VFP3 instructions if available - this implies " "enabling ARMv7 instructions (ARM only)") DEFINE_bool(enable_armv7, true, "enable use of ARMv7 instructions if available (ARM only)") DEFINE_bool(enable_fpu, true, "enable use of MIPS FPU instructions if available (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_gc, false, "expose gc extension") DEFINE_bool(expose_externalize_string, false, "expose externalize string 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") // checks.cc DEFINE_bool(stack_trace_on_abort, true, "print a stack trace if an assertion failure occurs") // codegen-ia32.cc / codegen-arm.cc 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(opt_eagerly, false, "be more eager when adaptively optimizing") DEFINE_bool(always_opt, false, "always try to optimize functions") DEFINE_bool(prepare_always_opt, false, "prepare for turning on always opt") DEFINE_bool(deopt, true, "support deoptimization") DEFINE_bool(trace_deopt, false, "trace deoptimization") // 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_bool(trace_bailout, false, "print reasons for falling back to using the classic V8 backend") // compilation-cache.cc DEFINE_bool(compilation_cache, true, "enable compilation cache") DEFINE_bool(cache_prototype_transitions, true, "cache prototype transitions") // debug.cc DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response") 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") // execution.cc DEFINE_int(stack_size, kPointerSize * 128, "default size of stack region v8 is allowed to use (in KkBytes)") // 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(print_cumulative_gc_stat, false, "print cumulative GC statistics 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(collect_maps, true, "garbage collect maps from which no objects can be reached") DEFINE_bool(flush_code, true, "flush code that we expect not to use again before full gc") 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") // 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") #ifdef LIVE_OBJECT_LIST // liveobjectlist.cc DEFINE_string(lol_workdir, NULL, "path for lol temp files") DEFINE_bool(verify_lol, false, "perform debugging verification for lol") #endif // 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(cleanup_caches_in_maps_at_gc, true, "Flush code caches in maps during mark compact cycle.") DEFINE_bool(never_compact, false, "Never perform compaction on full GC - testing only") DEFINE_bool(compact_code_space, false, "Compact code space") 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_int(random_seed, 0, "Default seed for initializing random generator " "(0, the default, means to use system random).") DEFINE_bool(canonicalize_object_literal_maps, true, "Canonicalize maps for object literals.") DEFINE_int(max_map_space_pages, MapSpace::kMaxMapPageIndex - 1, "Maximum number of pages in map space which still allows to encode " "forwarding pointers. That's actually a constant, but it's useful " "to control it with a flag for better testing.") // mksnapshot.cc DEFINE_bool(h, false, "print this message") DEFINE_bool(new_snapshot, true, "use new snapshot implementation") // objects.cc DEFINE_bool(use_verbose_printer, true, "allows verbose printing") // parser.cc DEFINE_bool(allow_natives_syntax, false, "allow natives syntax") // simulator-arm.cc and simulator-mips.cc DEFINE_bool(trace_sim, false, "Trace simulator execution") 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") DEFINE_int(sim_stack_alignment, 8, "Stack alingment in bytes in simulator (4 or 8, 8 is default)") // isolate.cc DEFINE_bool(trace_exception, false, "print stack trace when throwing exceptions") DEFINE_bool(preallocate_message_memory, false, "preallocate some memory to build stack traces.") 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)") // v8.cc DEFINE_bool(preemption, false, "activate a 100ms timer that switches between V8 threads") // 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_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 // // 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, JSArguments(), "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 DEFINE_bool(enable_slow_asserts, false, "enable asserts that are slow to execute") // codegen-ia32.cc / codegen-arm.cc DEFINE_bool(trace_codegen, false, "print name of functions for which code is generated") 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(print_json_ast, false, "print source AST as JSON") DEFINE_bool(print_builtin_json_ast, false, "print source AST for builtins as JSON") DEFINE_string(stop_at, "", "function name where to insert a breakpoint") // 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_heap, false, "verify heap pointers before and 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") // objects.cc DEFINE_bool(trace_normalization, false, "prints when objects are turned into dictionaries.") // runtime.cc DEFINE_bool(trace_lazy, false, "trace lazy compilation") // serialize.cc DEFINE_bool(debug_serialization, false, "write debug information into the snapshot.") // 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") // VM state DEFINE_bool(log_state_changes, false, "Log 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_auto, true, "Used with --prof, starts profiling automatically") DEFINE_bool(prof_lazy, false, "Used with --prof, only does sampling and logging" " when profiler is active (implies --noprof_auto).") 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_bool(sliding_state_window, false, "Update sliding state window counters.") DEFINE_string(logfile, "v8.log", "Specify the name of the log file.") DEFINE_bool(ll_prof, false, "Enable low-level linux profiler.") // // 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") // code-stubs.cc DEFINE_bool(print_code_stubs, false, "print code stubs") // 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(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 // Cleanup... #undef FLAG_FULL #undef FLAG_READONLY #undef FLAG #undef DEFINE_bool #undef DEFINE_int #undef DEFINE_string #undef DEFINE_implication #undef FLAG_MODE_DECLARE #undef FLAG_MODE_DEFINE #undef FLAG_MODE_DEFINE_DEFAULTS #undef FLAG_MODE_META #undef FLAG_MODE_DEFINE_IMPLICATIONS