1 // Copyright 2008 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 // This file defines all of the flags. It is separated into different section, 29 // for Debug, Release, Logging and Profiling, etc. To add a new flag, find the 30 // correct section, and use one of the DEFINE_ macros, without a trailing ';'. 31 // 32 // This include does not have a guard, because it is a template-style include, 33 // which can be included multiple times in different modes. It expects to have 34 // a mode defined before it's included. The modes are FLAG_MODE_... below: 35 36 // We want to declare the names of the variables for the header file. Normally 37 // this will just be an extern declaration, but for a readonly flag we let the 38 // compiler make better optimizations by giving it the value. 39 #if defined(FLAG_MODE_DECLARE) 40 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 41 extern ctype FLAG_##nam; 42 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) \ 43 static ctype const FLAG_##nam = def; 44 45 // We want to supply the actual storage and value for the flag variable in the 46 // .cc file. We only do this for writable flags. 47 #elif defined(FLAG_MODE_DEFINE) 48 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 49 ctype FLAG_##nam = def; 50 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) 51 52 // We need to define all of our default values so that the Flag structure can 53 // access them by pointer. These are just used internally inside of one .cc, 54 // for MODE_META, so there is no impact on the flags interface. 55 #elif defined(FLAG_MODE_DEFINE_DEFAULTS) 56 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 57 static ctype const FLAGDEFAULT_##nam = def; 58 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) 59 60 61 // We want to write entries into our meta data table, for internal parsing and 62 // printing / etc in the flag parser code. We only do this for writable flags. 63 #elif defined(FLAG_MODE_META) 64 #define FLAG_FULL(ftype, ctype, nam, def, cmt) \ 65 { Flag::TYPE_##ftype, #nam, &FLAG_##nam, &FLAGDEFAULT_##nam, cmt, false }, 66 #define FLAG_READONLY(ftype, ctype, nam, def, cmt) 67 68 #else 69 #error No mode supplied when including flags.defs 70 #endif 71 72 #ifdef FLAG_MODE_DECLARE 73 // Structure used to hold a collection of arguments to the JavaScript code. 74 struct JSArguments { 75 public: 76 JSArguments(); 77 JSArguments(int argc, const char** argv); 78 int argc() const; 79 const char** argv(); 80 const char*& operator[](int idx); 81 JSArguments& operator=(JSArguments args); 82 private: 83 int argc_; 84 const char** argv_; 85 }; 86 #endif 87 88 #define DEFINE_bool(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt) 89 #define DEFINE_int(nam, def, cmt) FLAG(INT, int, nam, def, cmt) 90 #define DEFINE_float(nam, def, cmt) FLAG(FLOAT, double, nam, def, cmt) 91 #define DEFINE_string(nam, def, cmt) FLAG(STRING, const char*, nam, def, cmt) 92 #define DEFINE_args(nam, def, cmt) FLAG(ARGS, JSArguments, nam, def, cmt) 93 94 // 95 // Flags in all modes. 96 // 97 #define FLAG FLAG_FULL 98 99 // assembler-ia32.cc / assembler-arm.cc / assembler-x64.cc 100 DEFINE_bool(debug_code, false, 101 "generate extra code (comments, assertions) for debugging") 102 DEFINE_bool(emit_branch_hints, false, "emit branch hints") 103 DEFINE_bool(push_pop_elimination, true, 104 "eliminate redundant push/pops in assembly code") 105 DEFINE_bool(print_push_pop_elimination, false, 106 "print elimination of redundant push/pops in assembly code") 107 DEFINE_bool(enable_sse2, true, 108 "enable use of SSE2 instructions if available") 109 DEFINE_bool(enable_sse3, true, 110 "enable use of SSE3 instructions if available") 111 DEFINE_bool(enable_cmov, true, 112 "enable use of CMOV instruction if available") 113 DEFINE_bool(enable_rdtsc, true, 114 "enable use of RDTSC instruction if available") 115 DEFINE_bool(enable_sahf, true, 116 "enable use of SAHF instruction if available (X64 only)") 117 DEFINE_bool(enable_vfp3, true, 118 "enable use of VFP3 instructions if available (ARM only)") 119 DEFINE_bool(enable_armv7, true, 120 "enable use of ARMv7 instructions if available (ARM only)") 121 122 // bootstrapper.cc 123 DEFINE_string(expose_natives_as, NULL, "expose natives in global object") 124 DEFINE_string(expose_debug_as, NULL, "expose debug in global object") 125 DEFINE_bool(expose_gc, false, "expose gc extension") 126 DEFINE_int(stack_trace_limit, 10, "number of stack frames to capture") 127 128 // builtins-ia32.cc 129 DEFINE_bool(inline_new, true, "use fast inline allocation") 130 131 // checks.cc 132 DEFINE_bool(stack_trace_on_abort, true, 133 "print a stack trace if an assertion failure occurs") 134 135 // codegen-ia32.cc / codegen-arm.cc 136 DEFINE_bool(trace, false, "trace function calls") 137 DEFINE_bool(defer_negation, true, "defer negation operation") 138 139 // codegen.cc 140 DEFINE_bool(lazy, true, "use lazy compilation") 141 DEFINE_bool(debug_info, true, "add debug information to compiled functions") 142 143 // compiler.cc 144 DEFINE_bool(strict, false, "strict error checking") 145 DEFINE_int(min_preparse_length, 1024, 146 "minimum length for automatic enable preparsing") 147 DEFINE_bool(full_compiler, true, "enable dedicated backend for run-once code") 148 DEFINE_bool(fast_compiler, false, "enable speculative optimizing backend") 149 DEFINE_bool(always_full_compiler, false, 150 "try to use the dedicated run-once backend for all code") 151 DEFINE_bool(always_fast_compiler, false, 152 "try to use the speculative optimizing backend for all code") 153 DEFINE_bool(trace_bailout, false, 154 "print reasons for falling back to using the classic V8 backend") 155 156 // compilation-cache.cc 157 DEFINE_bool(compilation_cache, true, "enable compilation cache") 158 159 // debug.cc 160 DEFINE_bool(remote_debugging, false, "enable remote debugging") 161 DEFINE_bool(trace_debug_json, false, "trace debugging JSON request/response") 162 DEFINE_bool(debugger_auto_break, true, 163 "automatically set the debug break flag when debugger commands are " 164 "in the queue") 165 166 // frames.cc 167 DEFINE_int(max_stack_trace_source_length, 300, 168 "maximum length of function source code printed in a stack trace.") 169 170 // heap.cc 171 DEFINE_int(max_new_space_size, 0, "max size of the new generation") 172 DEFINE_int(max_old_space_size, 0, "max size of the old generation") 173 DEFINE_bool(gc_global, false, "always perform global GCs") 174 DEFINE_int(gc_interval, -1, "garbage collect after <n> allocations") 175 DEFINE_bool(trace_gc, false, 176 "print one trace line following each garbage collection") 177 DEFINE_bool(trace_gc_verbose, false, 178 "print more details following each garbage collection") 179 DEFINE_bool(collect_maps, true, 180 "garbage collect maps from which no objects can be reached") 181 182 // v8.cc 183 DEFINE_bool(use_idle_notification, true, 184 "Use idle notification to reduce memory footprint.") 185 // ic.cc 186 DEFINE_bool(use_ic, true, "use inline caching") 187 188 // macro-assembler-ia32.cc 189 DEFINE_bool(native_code_counters, false, 190 "generate extra code for manipulating stats counters") 191 192 // mark-compact.cc 193 DEFINE_bool(always_compact, false, "Perform compaction on every full GC") 194 DEFINE_bool(never_compact, false, 195 "Never perform compaction on full GC - testing only") 196 DEFINE_bool(cleanup_ics_at_gc, true, 197 "Flush inline caches prior to mark compact collection.") 198 DEFINE_bool(cleanup_caches_in_maps_at_gc, true, 199 "Flush code caches in maps during mark compact cycle.") 200 201 DEFINE_bool(canonicalize_object_literal_maps, true, 202 "Canonicalize maps for object literals.") 203 204 DEFINE_bool(use_big_map_space, true, 205 "Use big map space, but don't compact if it grew too big.") 206 207 DEFINE_int(max_map_space_pages, MapSpace::kMaxMapPageIndex - 1, 208 "Maximum number of pages in map space which still allows to encode " 209 "forwarding pointers. That's actually a constant, but it's useful " 210 "to control it with a flag for better testing.") 211 212 // mksnapshot.cc 213 DEFINE_bool(h, false, "print this message") 214 DEFINE_bool(new_snapshot, true, "use new snapshot implementation") 215 216 // parser.cc 217 DEFINE_bool(allow_natives_syntax, false, "allow natives syntax") 218 219 // rewriter.cc 220 DEFINE_bool(optimize_ast, true, "optimize the ast") 221 222 // simulator-arm.cc and simulator-mips.cc 223 DEFINE_bool(trace_sim, false, "trace simulator execution") 224 DEFINE_int(stop_sim_at, 0, "Simulator stop after x number of instructions") 225 226 // top.cc 227 DEFINE_bool(trace_exception, false, 228 "print stack trace when throwing exceptions") 229 DEFINE_bool(preallocate_message_memory, false, 230 "preallocate some memory to build stack traces.") 231 232 // usage-analyzer.cc 233 DEFINE_bool(usage_computation, true, "compute variable usage counts") 234 235 // v8.cc 236 DEFINE_bool(preemption, false, 237 "activate a 100ms timer that switches between V8 threads") 238 239 // Regexp 240 DEFINE_bool(trace_regexps, false, "trace regexp execution") 241 DEFINE_bool(regexp_optimization, true, "generate optimized regexp code") 242 DEFINE_bool(regexp_entry_native, true, "use native code to enter regexp") 243 244 // Testing flags test/cctest/test-{flags,api,serialization}.cc 245 DEFINE_bool(testing_bool_flag, true, "testing_bool_flag") 246 DEFINE_int(testing_int_flag, 13, "testing_int_flag") 247 DEFINE_float(testing_float_flag, 2.5, "float-flag") 248 DEFINE_string(testing_string_flag, "Hello, world!", "string-flag") 249 DEFINE_int(testing_prng_seed, 42, "Seed used for threading test randomness") 250 #ifdef WIN32 251 DEFINE_string(testing_serialization_file, "C:\\Windows\\Temp\\serdes", 252 "file in which to testing_serialize heap") 253 #else 254 DEFINE_string(testing_serialization_file, "/tmp/serdes", 255 "file in which to serialize heap") 256 #endif 257 258 // 259 // Dev shell flags 260 // 261 262 DEFINE_bool(help, false, "Print usage message, including flags, on console") 263 DEFINE_bool(dump_counters, false, "Dump counters on exit") 264 DEFINE_bool(debugger, true, "Enable JavaScript debugger") 265 DEFINE_bool(remote_debugger, false, "Connect JavaScript debugger to the " 266 "debugger agent in another process") 267 DEFINE_bool(debugger_agent, false, "Enable debugger agent") 268 DEFINE_int(debugger_port, 5858, "Port to use for remote debugging") 269 DEFINE_string(map_counters, false, "Map counters to a file") 270 DEFINE_args(js_arguments, JSArguments(), 271 "Pass all remaining arguments to the script. Alias for \"--\".") 272 273 // 274 // Debug only flags 275 // 276 #undef FLAG 277 #ifdef DEBUG 278 #define FLAG FLAG_FULL 279 #else 280 #define FLAG FLAG_READONLY 281 #endif 282 283 // checks.cc 284 DEFINE_bool(enable_slow_asserts, false, 285 "enable asserts that are slow to execute") 286 287 // codegen-ia32.cc / codegen-arm.cc 288 DEFINE_bool(trace_codegen, false, 289 "print name of functions for which code is generated") 290 DEFINE_bool(print_source, false, "pretty print source code") 291 DEFINE_bool(print_builtin_source, false, 292 "pretty print source code for builtins") 293 DEFINE_bool(print_ast, false, "print source AST") 294 DEFINE_bool(print_builtin_ast, false, "print source AST for builtins") 295 DEFINE_bool(print_json_ast, false, "print source AST as JSON") 296 DEFINE_bool(print_builtin_json_ast, false, 297 "print source AST for builtins as JSON") 298 DEFINE_bool(trace_calls, false, "trace calls") 299 DEFINE_bool(trace_builtin_calls, false, "trace builtins calls") 300 DEFINE_string(stop_at, "", "function name where to insert a breakpoint") 301 302 // compiler.cc 303 DEFINE_bool(print_builtin_scopes, false, "print scopes for builtins") 304 DEFINE_bool(print_scopes, false, "print scopes") 305 DEFINE_bool(print_ir, false, "print the AST as seen by the backend") 306 307 // contexts.cc 308 DEFINE_bool(trace_contexts, false, "trace contexts operations") 309 310 // heap.cc 311 DEFINE_bool(gc_greedy, false, "perform GC prior to some allocations") 312 DEFINE_bool(gc_verbose, false, "print stuff during garbage collection") 313 DEFINE_bool(heap_stats, false, "report heap statistics before and after GC") 314 DEFINE_bool(code_stats, false, "report code statistics after GC") 315 DEFINE_bool(verify_heap, false, "verify heap pointers before and after GC") 316 DEFINE_bool(print_handles, false, "report handles after GC") 317 DEFINE_bool(print_global_handles, false, "report global handles after GC") 318 DEFINE_bool(print_rset, false, "print remembered sets before GC") 319 320 // ic.cc 321 DEFINE_bool(trace_ic, false, "trace inline cache state transitions") 322 323 // objects.cc 324 DEFINE_bool(trace_normalization, 325 false, 326 "prints when objects are turned into dictionaries.") 327 328 // runtime.cc 329 DEFINE_bool(trace_lazy, false, "trace lazy compilation") 330 331 // serialize.cc 332 DEFINE_bool(debug_serialization, false, 333 "write debug information into the snapshot.") 334 335 // spaces.cc 336 DEFINE_bool(collect_heap_spill_statistics, false, 337 "report heap spill statistics along with heap_stats " 338 "(requires heap_stats)") 339 340 // Regexp 341 DEFINE_bool(regexp_possessive_quantifier, 342 false, 343 "enable possessive quantifier syntax for testing") 344 DEFINE_bool(trace_regexp_bytecodes, false, "trace regexp bytecode execution") 345 DEFINE_bool(trace_regexp_assembler, 346 false, 347 "trace regexp macro assembler calls.") 348 349 // 350 // Logging and profiling only flags 351 // 352 #undef FLAG 353 #ifdef ENABLE_LOGGING_AND_PROFILING 354 #define FLAG FLAG_FULL 355 #else 356 #define FLAG FLAG_READONLY 357 #endif 358 359 // log.cc 360 DEFINE_bool(log, false, 361 "Minimal logging (no API, code, GC, suspect, or handles samples).") 362 DEFINE_bool(log_all, false, "Log all events to the log file.") 363 DEFINE_bool(log_runtime, false, "Activate runtime system %Log call.") 364 DEFINE_bool(log_api, false, "Log API events to the log file.") 365 DEFINE_bool(log_code, false, 366 "Log code events to the log file without profiling.") 367 DEFINE_bool(log_gc, false, 368 "Log heap samples on garbage collection for the hp2ps tool.") 369 DEFINE_bool(log_handles, false, "Log global handle events.") 370 DEFINE_bool(log_snapshot_positions, false, 371 "log positions of (de)serialized objects in the snapshot.") 372 DEFINE_bool(log_state_changes, false, "Log state changes.") 373 DEFINE_bool(log_suspect, false, "Log suspect operations.") 374 DEFINE_bool(log_producers, false, "Log stack traces of JS objects allocations.") 375 DEFINE_bool(compress_log, false, 376 "Compress log to save space (makes log less human-readable).") 377 DEFINE_bool(prof, false, 378 "Log statistical profiling information (implies --log-code).") 379 DEFINE_bool(prof_auto, true, 380 "Used with --prof, starts profiling automatically") 381 DEFINE_bool(prof_lazy, false, 382 "Used with --prof, only does sampling and logging" 383 " when profiler is active (implies --noprof_auto).") 384 DEFINE_bool(log_regexp, false, "Log regular expression execution.") 385 DEFINE_bool(sliding_state_window, false, 386 "Update sliding state window counters.") 387 DEFINE_string(logfile, "v8.log", "Specify the name of the log file.") 388 DEFINE_bool(oprofile, false, "Enable JIT agent for OProfile.") 389 390 // 391 // Heap protection flags 392 // Using heap protection requires ENABLE_LOGGING_AND_PROFILING as well. 393 // 394 #ifdef ENABLE_HEAP_PROTECTION 395 #undef FLAG 396 #define FLAG FLAG_FULL 397 398 DEFINE_bool(protect_heap, false, 399 "Protect/unprotect V8's heap when leaving/entring the VM.") 400 401 #endif 402 403 // 404 // Disassembler only flags 405 // 406 #undef FLAG 407 #ifdef ENABLE_DISASSEMBLER 408 #define FLAG FLAG_FULL 409 #else 410 #define FLAG FLAG_READONLY 411 #endif 412 413 // code-stubs.cc 414 DEFINE_bool(print_code_stubs, false, "print code stubs") 415 416 // codegen-ia32.cc / codegen-arm.cc 417 DEFINE_bool(print_code, false, "print generated code") 418 DEFINE_bool(print_builtin_code, false, "print generated code for builtins") 419 420 // Cleanup... 421 #undef FLAG_FULL 422 #undef FLAG_READONLY 423 #undef FLAG 424 425 #undef DEFINE_bool 426 #undef DEFINE_int 427 #undef DEFINE_string 428 429 #undef FLAG_MODE_DECLARE 430 #undef FLAG_MODE_DEFINE 431 #undef FLAG_MODE_DEFINE_DEFAULTS 432 #undef FLAG_MODE_META 433
