1 /* 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 #include "incls/_precompiled.incl" 26 #include "incls/_arguments.cpp.incl" 27 28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp" 29 #define DEFAULT_JAVA_LAUNCHER "generic" 30 31 char** Arguments::_jvm_flags_array = NULL; 32 int Arguments::_num_jvm_flags = 0; 33 char** Arguments::_jvm_args_array = NULL; 34 int Arguments::_num_jvm_args = 0; 35 char* Arguments::_java_command = NULL; 36 SystemProperty* Arguments::_system_properties = NULL; 37 const char* Arguments::_gc_log_filename = NULL; 38 bool Arguments::_has_profile = false; 39 bool Arguments::_has_alloc_profile = false; 40 uintx Arguments::_min_heap_size = 0; 41 Arguments::Mode Arguments::_mode = _mixed; 42 bool Arguments::_java_compiler = false; 43 bool Arguments::_xdebug_mode = false; 44 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 45 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 46 int Arguments::_sun_java_launcher_pid = -1; 47 48 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 49 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 50 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 51 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 52 bool Arguments::_ClipInlining = ClipInlining; 53 intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold; 54 55 char* Arguments::SharedArchivePath = NULL; 56 57 AgentLibraryList Arguments::_libraryList; 58 AgentLibraryList Arguments::_agentList; 59 60 abort_hook_t Arguments::_abort_hook = NULL; 61 exit_hook_t Arguments::_exit_hook = NULL; 62 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 63 64 65 SystemProperty *Arguments::_java_ext_dirs = NULL; 66 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 67 SystemProperty *Arguments::_sun_boot_library_path = NULL; 68 SystemProperty *Arguments::_java_library_path = NULL; 69 SystemProperty *Arguments::_java_home = NULL; 70 SystemProperty *Arguments::_java_class_path = NULL; 71 SystemProperty *Arguments::_sun_boot_class_path = NULL; 72 73 char* Arguments::_meta_index_path = NULL; 74 char* Arguments::_meta_index_dir = NULL; 75 76 static bool force_client_mode = false; 77 78 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 79 80 static bool match_option(const JavaVMOption *option, const char* name, 81 const char** tail) { 82 int len = (int)strlen(name); 83 if (strncmp(option->optionString, name, len) == 0) { 84 *tail = option->optionString + len; 85 return true; 86 } else { 87 return false; 88 } 89 } 90 91 static void logOption(const char* opt) { 92 if (PrintVMOptions) { 93 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 94 } 95 } 96 97 // Process java launcher properties. 98 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 99 // See if sun.java.launcher or sun.java.launcher.pid is defined. 100 // Must do this before setting up other system properties, 101 // as some of them may depend on launcher type. 102 for (int index = 0; index < args->nOptions; index++) { 103 const JavaVMOption* option = args->options + index; 104 const char* tail; 105 106 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 107 process_java_launcher_argument(tail, option->extraInfo); 108 continue; 109 } 110 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 111 _sun_java_launcher_pid = atoi(tail); 112 continue; 113 } 114 } 115 } 116 117 // Initialize system properties key and value. 118 void Arguments::init_system_properties() { 119 120 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false)); 121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 122 "Java Virtual Machine Specification", false)); 123 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor", 124 "Sun Microsystems Inc.", false)); 125 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 129 130 // following are JVMTI agent writeable properties. 131 // Properties values are set to NULL and they are 132 // os specific they are initialized in os::init_system_properties_values(). 133 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 134 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 135 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 136 _java_library_path = new SystemProperty("java.library.path", NULL, true); 137 _java_home = new SystemProperty("java.home", NULL, true); 138 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 139 140 _java_class_path = new SystemProperty("java.class.path", "", true); 141 142 // Add to System Property list. 143 PropertyList_add(&_system_properties, _java_ext_dirs); 144 PropertyList_add(&_system_properties, _java_endorsed_dirs); 145 PropertyList_add(&_system_properties, _sun_boot_library_path); 146 PropertyList_add(&_system_properties, _java_library_path); 147 PropertyList_add(&_system_properties, _java_home); 148 PropertyList_add(&_system_properties, _java_class_path); 149 PropertyList_add(&_system_properties, _sun_boot_class_path); 150 151 // Set OS specific system properties values 152 os::init_system_properties_values(); 153 } 154 155 /** 156 * Provide a slightly more user-friendly way of eliminating -XX flags. 157 * When a flag is eliminated, it can be added to this list in order to 158 * continue accepting this flag on the command-line, while issuing a warning 159 * and ignoring the value. Once the JDK version reaches the 'accept_until' 160 * limit, we flatly refuse to admit the existence of the flag. This allows 161 * a flag to die correctly over JDK releases using HSX. 162 */ 163 typedef struct { 164 const char* name; 165 JDK_Version obsoleted_in; // when the flag went away 166 JDK_Version accept_until; // which version to start denying the existence 167 } ObsoleteFlag; 168 169 static ObsoleteFlag obsolete_jvm_flags[] = { 170 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 171 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 172 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 173 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 174 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 175 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 176 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 177 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 178 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 179 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 180 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 181 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 182 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 183 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 184 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 185 { "DefaultInitialRAMFraction", 186 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 187 { NULL, JDK_Version(0), JDK_Version(0) } 188 }; 189 190 // Returns true if the flag is obsolete and fits into the range specified 191 // for being ignored. In the case that the flag is ignored, the 'version' 192 // value is filled in with the version number when the flag became 193 // obsolete so that that value can be displayed to the user. 194 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 195 int i = 0; 196 assert(version != NULL, "Must provide a version buffer"); 197 while (obsolete_jvm_flags[i].name != NULL) { 198 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 199 // <flag>=xxx form 200 // [-|+]<flag> form 201 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 202 ((s[0] == '+' || s[0] == '-') && 203 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 204 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 205 *version = flag_status.obsoleted_in; 206 return true; 207 } 208 } 209 i++; 210 } 211 return false; 212 } 213 214 // Constructs the system class path (aka boot class path) from the following 215 // components, in order: 216 // 217 // prefix // from -Xbootclasspath/p:... 218 // endorsed // the expansion of -Djava.endorsed.dirs=... 219 // base // from os::get_system_properties() or -Xbootclasspath= 220 // suffix // from -Xbootclasspath/a:... 221 // 222 // java.endorsed.dirs is a list of directories; any jar or zip files in the 223 // directories are added to the sysclasspath just before the base. 224 // 225 // This could be AllStatic, but it isn't needed after argument processing is 226 // complete. 227 class SysClassPath: public StackObj { 228 public: 229 SysClassPath(const char* base); 230 ~SysClassPath(); 231 232 inline void set_base(const char* base); 233 inline void add_prefix(const char* prefix); 234 inline void add_suffix_to_prefix(const char* suffix); 235 inline void add_suffix(const char* suffix); 236 inline void reset_path(const char* base); 237 238 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 239 // property. Must be called after all command-line arguments have been 240 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 241 // combined_path(). 242 void expand_endorsed(); 243 244 inline const char* get_base() const { return _items[_scp_base]; } 245 inline const char* get_prefix() const { return _items[_scp_prefix]; } 246 inline const char* get_suffix() const { return _items[_scp_suffix]; } 247 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 248 249 // Combine all the components into a single c-heap-allocated string; caller 250 // must free the string if/when no longer needed. 251 char* combined_path(); 252 253 private: 254 // Utility routines. 255 static char* add_to_path(const char* path, const char* str, bool prepend); 256 static char* add_jars_to_path(char* path, const char* directory); 257 258 inline void reset_item_at(int index); 259 260 // Array indices for the items that make up the sysclasspath. All except the 261 // base are allocated in the C heap and freed by this class. 262 enum { 263 _scp_prefix, // from -Xbootclasspath/p:... 264 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 265 _scp_base, // the default sysclasspath 266 _scp_suffix, // from -Xbootclasspath/a:... 267 _scp_nitems // the number of items, must be last. 268 }; 269 270 const char* _items[_scp_nitems]; 271 DEBUG_ONLY(bool _expansion_done;) 272 }; 273 274 SysClassPath::SysClassPath(const char* base) { 275 memset(_items, 0, sizeof(_items)); 276 _items[_scp_base] = base; 277 DEBUG_ONLY(_expansion_done = false;) 278 } 279 280 SysClassPath::~SysClassPath() { 281 // Free everything except the base. 282 for (int i = 0; i < _scp_nitems; ++i) { 283 if (i != _scp_base) reset_item_at(i); 284 } 285 DEBUG_ONLY(_expansion_done = false;) 286 } 287 288 inline void SysClassPath::set_base(const char* base) { 289 _items[_scp_base] = base; 290 } 291 292 inline void SysClassPath::add_prefix(const char* prefix) { 293 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 294 } 295 296 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 297 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 298 } 299 300 inline void SysClassPath::add_suffix(const char* suffix) { 301 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 302 } 303 304 inline void SysClassPath::reset_item_at(int index) { 305 assert(index < _scp_nitems && index != _scp_base, "just checking"); 306 if (_items[index] != NULL) { 307 FREE_C_HEAP_ARRAY(char, _items[index]); 308 _items[index] = NULL; 309 } 310 } 311 312 inline void SysClassPath::reset_path(const char* base) { 313 // Clear the prefix and suffix. 314 reset_item_at(_scp_prefix); 315 reset_item_at(_scp_suffix); 316 set_base(base); 317 } 318 319 //------------------------------------------------------------------------------ 320 321 void SysClassPath::expand_endorsed() { 322 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 323 324 const char* path = Arguments::get_property("java.endorsed.dirs"); 325 if (path == NULL) { 326 path = Arguments::get_endorsed_dir(); 327 assert(path != NULL, "no default for java.endorsed.dirs"); 328 } 329 330 char* expanded_path = NULL; 331 const char separator = *os::path_separator(); 332 const char* const end = path + strlen(path); 333 while (path < end) { 334 const char* tmp_end = strchr(path, separator); 335 if (tmp_end == NULL) { 336 expanded_path = add_jars_to_path(expanded_path, path); 337 path = end; 338 } else { 339 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1); 340 memcpy(dirpath, path, tmp_end - path); 341 dirpath[tmp_end - path] = '\0'; 342 expanded_path = add_jars_to_path(expanded_path, dirpath); 343 FREE_C_HEAP_ARRAY(char, dirpath); 344 path = tmp_end + 1; 345 } 346 } 347 _items[_scp_endorsed] = expanded_path; 348 DEBUG_ONLY(_expansion_done = true;) 349 } 350 351 // Combine the bootclasspath elements, some of which may be null, into a single 352 // c-heap-allocated string. 353 char* SysClassPath::combined_path() { 354 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 355 assert(_expansion_done, "must call expand_endorsed() first."); 356 357 size_t lengths[_scp_nitems]; 358 size_t total_len = 0; 359 360 const char separator = *os::path_separator(); 361 362 // Get the lengths. 363 int i; 364 for (i = 0; i < _scp_nitems; ++i) { 365 if (_items[i] != NULL) { 366 lengths[i] = strlen(_items[i]); 367 // Include space for the separator char (or a NULL for the last item). 368 total_len += lengths[i] + 1; 369 } 370 } 371 assert(total_len > 0, "empty sysclasspath not allowed"); 372 373 // Copy the _items to a single string. 374 char* cp = NEW_C_HEAP_ARRAY(char, total_len); 375 char* cp_tmp = cp; 376 for (i = 0; i < _scp_nitems; ++i) { 377 if (_items[i] != NULL) { 378 memcpy(cp_tmp, _items[i], lengths[i]); 379 cp_tmp += lengths[i]; 380 *cp_tmp++ = separator; 381 } 382 } 383 *--cp_tmp = '\0'; // Replace the extra separator. 384 return cp; 385 } 386 387 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 388 char* 389 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 390 char *cp; 391 392 assert(str != NULL, "just checking"); 393 if (path == NULL) { 394 size_t len = strlen(str) + 1; 395 cp = NEW_C_HEAP_ARRAY(char, len); 396 memcpy(cp, str, len); // copy the trailing null 397 } else { 398 const char separator = *os::path_separator(); 399 size_t old_len = strlen(path); 400 size_t str_len = strlen(str); 401 size_t len = old_len + str_len + 2; 402 403 if (prepend) { 404 cp = NEW_C_HEAP_ARRAY(char, len); 405 char* cp_tmp = cp; 406 memcpy(cp_tmp, str, str_len); 407 cp_tmp += str_len; 408 *cp_tmp = separator; 409 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 410 FREE_C_HEAP_ARRAY(char, path); 411 } else { 412 cp = REALLOC_C_HEAP_ARRAY(char, path, len); 413 char* cp_tmp = cp + old_len; 414 *cp_tmp = separator; 415 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 416 } 417 } 418 return cp; 419 } 420 421 // Scan the directory and append any jar or zip files found to path. 422 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 423 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 424 DIR* dir = os::opendir(directory); 425 if (dir == NULL) return path; 426 427 char dir_sep[2] = { '\0', '\0' }; 428 size_t directory_len = strlen(directory); 429 const char fileSep = *os::file_separator(); 430 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 431 432 /* Scan the directory for jars/zips, appending them to path. */ 433 struct dirent *entry; 434 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory)); 435 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 436 const char* name = entry->d_name; 437 const char* ext = name + strlen(name) - 4; 438 bool isJarOrZip = ext > name && 439 (os::file_name_strcmp(ext, ".jar") == 0 || 440 os::file_name_strcmp(ext, ".zip") == 0); 441 if (isJarOrZip) { 442 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name)); 443 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 444 path = add_to_path(path, jarpath, false); 445 FREE_C_HEAP_ARRAY(char, jarpath); 446 } 447 } 448 FREE_C_HEAP_ARRAY(char, dbuf); 449 os::closedir(dir); 450 return path; 451 } 452 453 // Parses a memory size specification string. 454 static bool atomull(const char *s, julong* result) { 455 julong n = 0; 456 int args_read = sscanf(s, os::julong_format_specifier(), &n); 457 if (args_read != 1) { 458 return false; 459 } 460 while (*s != '\0' && isdigit(*s)) { 461 s++; 462 } 463 // 4705540: illegal if more characters are found after the first non-digit 464 if (strlen(s) > 1) { 465 return false; 466 } 467 switch (*s) { 468 case 'T': case 't': 469 *result = n * G * K; 470 // Check for overflow. 471 if (*result/((julong)G * K) != n) return false; 472 return true; 473 case 'G': case 'g': 474 *result = n * G; 475 if (*result/G != n) return false; 476 return true; 477 case 'M': case 'm': 478 *result = n * M; 479 if (*result/M != n) return false; 480 return true; 481 case 'K': case 'k': 482 *result = n * K; 483 if (*result/K != n) return false; 484 return true; 485 case '\0': 486 *result = n; 487 return true; 488 default: 489 return false; 490 } 491 } 492 493 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 494 if (size < min_size) return arg_too_small; 495 // Check that size will fit in a size_t (only relevant on 32-bit) 496 if (size > max_uintx) return arg_too_big; 497 return arg_in_range; 498 } 499 500 // Describe an argument out of range error 501 void Arguments::describe_range_error(ArgsRange errcode) { 502 switch(errcode) { 503 case arg_too_big: 504 jio_fprintf(defaultStream::error_stream(), 505 "The specified size exceeds the maximum " 506 "representable size.\n"); 507 break; 508 case arg_too_small: 509 case arg_unreadable: 510 case arg_in_range: 511 // do nothing for now 512 break; 513 default: 514 ShouldNotReachHere(); 515 } 516 } 517 518 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 519 return CommandLineFlags::boolAtPut(name, &value, origin); 520 } 521 522 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 523 double v; 524 if (sscanf(value, "%lf", &v) != 1) { 525 return false; 526 } 527 528 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 529 return true; 530 } 531 return false; 532 } 533 534 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 535 julong v; 536 intx intx_v; 537 bool is_neg = false; 538 // Check the sign first since atomull() parses only unsigned values. 539 if (*value == '-') { 540 if (!CommandLineFlags::intxAt(name, &intx_v)) { 541 return false; 542 } 543 value++; 544 is_neg = true; 545 } 546 if (!atomull(value, &v)) { 547 return false; 548 } 549 intx_v = (intx) v; 550 if (is_neg) { 551 intx_v = -intx_v; 552 } 553 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 554 return true; 555 } 556 uintx uintx_v = (uintx) v; 557 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 558 return true; 559 } 560 uint64_t uint64_t_v = (uint64_t) v; 561 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 562 return true; 563 } 564 return false; 565 } 566 567 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 568 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 569 // Contract: CommandLineFlags always returns a pointer that needs freeing. 570 FREE_C_HEAP_ARRAY(char, value); 571 return true; 572 } 573 574 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 575 const char* old_value = ""; 576 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 577 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 578 size_t new_len = strlen(new_value); 579 const char* value; 580 char* free_this_too = NULL; 581 if (old_len == 0) { 582 value = new_value; 583 } else if (new_len == 0) { 584 value = old_value; 585 } else { 586 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1); 587 // each new setting adds another LINE to the switch: 588 sprintf(buf, "%s\n%s", old_value, new_value); 589 value = buf; 590 free_this_too = buf; 591 } 592 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 593 // CommandLineFlags always returns a pointer that needs freeing. 594 FREE_C_HEAP_ARRAY(char, value); 595 if (free_this_too != NULL) { 596 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 597 FREE_C_HEAP_ARRAY(char, free_this_too); 598 } 599 return true; 600 } 601 602 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 603 604 // range of acceptable characters spelled out for portability reasons 605 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 606 #define BUFLEN 255 607 char name[BUFLEN+1]; 608 char dummy; 609 610 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 611 return set_bool_flag(name, false, origin); 612 } 613 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 614 return set_bool_flag(name, true, origin); 615 } 616 617 char punct; 618 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 619 const char* value = strchr(arg, '=') + 1; 620 Flag* flag = Flag::find_flag(name, strlen(name)); 621 if (flag != NULL && flag->is_ccstr()) { 622 if (flag->ccstr_accumulates()) { 623 return append_to_string_flag(name, value, origin); 624 } else { 625 if (value[0] == '\0') { 626 value = NULL; 627 } 628 return set_string_flag(name, value, origin); 629 } 630 } 631 } 632 633 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 634 const char* value = strchr(arg, '=') + 1; 635 // -XX:Foo:=xxx will reset the string flag to the given value. 636 if (value[0] == '\0') { 637 value = NULL; 638 } 639 return set_string_flag(name, value, origin); 640 } 641 642 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 643 #define SIGNED_NUMBER_RANGE "[-0123456789]" 644 #define NUMBER_RANGE "[0123456789]" 645 char value[BUFLEN + 1]; 646 char value2[BUFLEN + 1]; 647 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 648 // Looks like a floating-point number -- try again with more lenient format string 649 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 650 return set_fp_numeric_flag(name, value, origin); 651 } 652 } 653 654 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 655 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 656 return set_numeric_flag(name, value, origin); 657 } 658 659 return false; 660 } 661 662 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 663 assert(bldarray != NULL, "illegal argument"); 664 665 if (arg == NULL) { 666 return; 667 } 668 669 int index = *count; 670 671 // expand the array and add arg to the last element 672 (*count)++; 673 if (*bldarray == NULL) { 674 *bldarray = NEW_C_HEAP_ARRAY(char*, *count); 675 } else { 676 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count); 677 } 678 (*bldarray)[index] = strdup(arg); 679 } 680 681 void Arguments::build_jvm_args(const char* arg) { 682 add_string(&_jvm_args_array, &_num_jvm_args, arg); 683 } 684 685 void Arguments::build_jvm_flags(const char* arg) { 686 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 687 } 688 689 // utility function to return a string that concatenates all 690 // strings in a given char** array 691 const char* Arguments::build_resource_string(char** args, int count) { 692 if (args == NULL || count == 0) { 693 return NULL; 694 } 695 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 696 for (int i = 1; i < count; i++) { 697 length += strlen(args[i]) + 1; // add 1 for a space 698 } 699 char* s = NEW_RESOURCE_ARRAY(char, length); 700 strcpy(s, args[0]); 701 for (int j = 1; j < count; j++) { 702 strcat(s, " "); 703 strcat(s, args[j]); 704 } 705 return (const char*) s; 706 } 707 708 void Arguments::print_on(outputStream* st) { 709 st->print_cr("VM Arguments:"); 710 if (num_jvm_flags() > 0) { 711 st->print("jvm_flags: "); print_jvm_flags_on(st); 712 } 713 if (num_jvm_args() > 0) { 714 st->print("jvm_args: "); print_jvm_args_on(st); 715 } 716 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 717 st->print_cr("Launcher Type: %s", _sun_java_launcher); 718 } 719 720 void Arguments::print_jvm_flags_on(outputStream* st) { 721 if (_num_jvm_flags > 0) { 722 for (int i=0; i < _num_jvm_flags; i++) { 723 st->print("%s ", _jvm_flags_array[i]); 724 } 725 st->print_cr(""); 726 } 727 } 728 729 void Arguments::print_jvm_args_on(outputStream* st) { 730 if (_num_jvm_args > 0) { 731 for (int i=0; i < _num_jvm_args; i++) { 732 st->print("%s ", _jvm_args_array[i]); 733 } 734 st->print_cr(""); 735 } 736 } 737 738 bool Arguments::process_argument(const char* arg, 739 jboolean ignore_unrecognized, FlagValueOrigin origin) { 740 741 JDK_Version since = JDK_Version(); 742 743 if (parse_argument(arg, origin)) { 744 // do nothing 745 } else if (is_newly_obsolete(arg, &since)) { 746 enum { bufsize = 256 }; 747 char buffer[bufsize]; 748 since.to_string(buffer, bufsize); 749 jio_fprintf(defaultStream::error_stream(), 750 "Warning: The flag %s has been EOL'd as of %s and will" 751 " be ignored\n", arg, buffer); 752 } else { 753 if (!ignore_unrecognized) { 754 jio_fprintf(defaultStream::error_stream(), 755 "Unrecognized VM option '%s'\n", arg); 756 // allow for commandline "commenting out" options like -XX:#+Verbose 757 if (strlen(arg) == 0 || arg[0] != '#') { 758 return false; 759 } 760 } 761 } 762 return true; 763 } 764 765 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 766 FILE* stream = fopen(file_name, "rb"); 767 if (stream == NULL) { 768 if (should_exist) { 769 jio_fprintf(defaultStream::error_stream(), 770 "Could not open settings file %s\n", file_name); 771 return false; 772 } else { 773 return true; 774 } 775 } 776 777 char token[1024]; 778 int pos = 0; 779 780 bool in_white_space = true; 781 bool in_comment = false; 782 bool in_quote = false; 783 char quote_c = 0; 784 bool result = true; 785 786 int c = getc(stream); 787 while(c != EOF) { 788 if (in_white_space) { 789 if (in_comment) { 790 if (c == '\n') in_comment = false; 791 } else { 792 if (c == '#') in_comment = true; 793 else if (!isspace(c)) { 794 in_white_space = false; 795 token[pos++] = c; 796 } 797 } 798 } else { 799 if (c == '\n' || (!in_quote && isspace(c))) { 800 // token ends at newline, or at unquoted whitespace 801 // this allows a way to include spaces in string-valued options 802 token[pos] = '\0'; 803 logOption(token); 804 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 805 build_jvm_flags(token); 806 pos = 0; 807 in_white_space = true; 808 in_quote = false; 809 } else if (!in_quote && (c == '\'' || c == '"')) { 810 in_quote = true; 811 quote_c = c; 812 } else if (in_quote && (c == quote_c)) { 813 in_quote = false; 814 } else { 815 token[pos++] = c; 816 } 817 } 818 c = getc(stream); 819 } 820 if (pos > 0) { 821 token[pos] = '\0'; 822 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 823 build_jvm_flags(token); 824 } 825 fclose(stream); 826 return result; 827 } 828 829 //============================================================================================================= 830 // Parsing of properties (-D) 831 832 const char* Arguments::get_property(const char* key) { 833 return PropertyList_get_value(system_properties(), key); 834 } 835 836 bool Arguments::add_property(const char* prop) { 837 const char* eq = strchr(prop, '='); 838 char* key; 839 // ns must be static--its address may be stored in a SystemProperty object. 840 const static char ns[1] = {0}; 841 char* value = (char *)ns; 842 843 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 844 key = AllocateHeap(key_len + 1, "add_property"); 845 strncpy(key, prop, key_len); 846 key[key_len] = '\0'; 847 848 if (eq != NULL) { 849 size_t value_len = strlen(prop) - key_len - 1; 850 value = AllocateHeap(value_len + 1, "add_property"); 851 strncpy(value, &prop[key_len + 1], value_len + 1); 852 } 853 854 if (strcmp(key, "java.compiler") == 0) { 855 process_java_compiler_argument(value); 856 FreeHeap(key); 857 if (eq != NULL) { 858 FreeHeap(value); 859 } 860 return true; 861 } else if (strcmp(key, "sun.java.command") == 0) { 862 _java_command = value; 863 864 // don't add this property to the properties exposed to the java application 865 FreeHeap(key); 866 return true; 867 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 868 // launcher.pid property is private and is processed 869 // in process_sun_java_launcher_properties(); 870 // the sun.java.launcher property is passed on to the java application 871 FreeHeap(key); 872 if (eq != NULL) { 873 FreeHeap(value); 874 } 875 return true; 876 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 877 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 878 // its value without going through the property list or making a Java call. 879 _java_vendor_url_bug = value; 880 } else if (strcmp(key, "sun.boot.library.path") == 0) { 881 PropertyList_unique_add(&_system_properties, key, value, true); 882 return true; 883 } 884 // Create new property and add at the end of the list 885 PropertyList_unique_add(&_system_properties, key, value); 886 return true; 887 } 888 889 //=========================================================================================================== 890 // Setting int/mixed/comp mode flags 891 892 void Arguments::set_mode_flags(Mode mode) { 893 // Set up default values for all flags. 894 // If you add a flag to any of the branches below, 895 // add a default value for it here. 896 set_java_compiler(false); 897 _mode = mode; 898 899 // Ensure Agent_OnLoad has the correct initial values. 900 // This may not be the final mode; mode may change later in onload phase. 901 PropertyList_unique_add(&_system_properties, "java.vm.info", 902 (char*)Abstract_VM_Version::vm_info_string(), false); 903 904 UseInterpreter = true; 905 UseCompiler = true; 906 UseLoopCounter = true; 907 908 // Default values may be platform/compiler dependent - 909 // use the saved values 910 ClipInlining = Arguments::_ClipInlining; 911 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 912 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 913 BackgroundCompilation = Arguments::_BackgroundCompilation; 914 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold; 915 916 // Change from defaults based on mode 917 switch (mode) { 918 default: 919 ShouldNotReachHere(); 920 break; 921 case _int: 922 UseCompiler = false; 923 UseLoopCounter = false; 924 AlwaysCompileLoopMethods = false; 925 UseOnStackReplacement = false; 926 break; 927 case _mixed: 928 // same as default 929 break; 930 case _comp: 931 UseInterpreter = false; 932 BackgroundCompilation = false; 933 ClipInlining = false; 934 break; 935 } 936 } 937 938 // Conflict: required to use shared spaces (-Xshare:on), but 939 // incompatible command line options were chosen. 940 941 static void no_shared_spaces() { 942 if (RequireSharedSpaces) { 943 jio_fprintf(defaultStream::error_stream(), 944 "Class data sharing is inconsistent with other specified options.\n"); 945 vm_exit_during_initialization("Unable to use shared archive.", NULL); 946 } else { 947 FLAG_SET_DEFAULT(UseSharedSpaces, false); 948 } 949 } 950 951 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 952 // if it's not explictly set or unset. If the user has chosen 953 // UseParNewGC and not explicitly set ParallelGCThreads we 954 // set it, unless this is a single cpu machine. 955 void Arguments::set_parnew_gc_flags() { 956 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 957 "control point invariant"); 958 assert(UseParNewGC, "Error"); 959 960 // Turn off AdaptiveSizePolicy by default for parnew until it is 961 // complete. 962 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 963 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 964 } 965 966 if (ParallelGCThreads == 0) { 967 FLAG_SET_DEFAULT(ParallelGCThreads, 968 Abstract_VM_Version::parallel_worker_threads()); 969 if (ParallelGCThreads == 1) { 970 FLAG_SET_DEFAULT(UseParNewGC, false); 971 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 972 } 973 } 974 if (UseParNewGC) { 975 // CDS doesn't work with ParNew yet 976 no_shared_spaces(); 977 978 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 979 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 980 // we set them to 1024 and 1024. 981 // See CR 6362902. 982 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 983 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 984 } 985 if (FLAG_IS_DEFAULT(OldPLABSize)) { 986 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 987 } 988 989 // AlwaysTenure flag should make ParNew promote all at first collection. 990 // See CR 6362902. 991 if (AlwaysTenure) { 992 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 993 } 994 // When using compressed oops, we use local overflow stacks, 995 // rather than using a global overflow list chained through 996 // the klass word of the object's pre-image. 997 if (UseCompressedOops && !ParGCUseLocalOverflow) { 998 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 999 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1000 } 1001 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1002 } 1003 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1004 } 1005 } 1006 1007 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1008 // sparc/solaris for certain applications, but would gain from 1009 // further optimization and tuning efforts, and would almost 1010 // certainly gain from analysis of platform and environment. 1011 void Arguments::set_cms_and_parnew_gc_flags() { 1012 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1013 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1014 1015 // If we are using CMS, we prefer to UseParNewGC, 1016 // unless explicitly forbidden. 1017 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1018 FLAG_SET_ERGO(bool, UseParNewGC, true); 1019 } 1020 1021 // Turn off AdaptiveSizePolicy by default for cms until it is 1022 // complete. 1023 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1024 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1025 } 1026 1027 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1028 // as needed. 1029 if (UseParNewGC) { 1030 set_parnew_gc_flags(); 1031 } 1032 1033 // Now make adjustments for CMS 1034 size_t young_gen_per_worker; 1035 intx new_ratio; 1036 size_t min_new_default; 1037 intx tenuring_default; 1038 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0 1039 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) { 1040 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M); 1041 } 1042 young_gen_per_worker = 4*M; 1043 new_ratio = (intx)15; 1044 min_new_default = 4*M; 1045 tenuring_default = (intx)0; 1046 } else { // new defaults: "new" as of 6.0 1047 young_gen_per_worker = CMSYoungGenPerWorker; 1048 new_ratio = (intx)7; 1049 min_new_default = 16*M; 1050 tenuring_default = (intx)4; 1051 } 1052 1053 // Preferred young gen size for "short" pauses 1054 const uintx parallel_gc_threads = 1055 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1056 const size_t preferred_max_new_size_unaligned = 1057 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads); 1058 const size_t preferred_max_new_size = 1059 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1060 1061 // Unless explicitly requested otherwise, size young gen 1062 // for "short" pauses ~ 4M*ParallelGCThreads 1063 1064 // If either MaxNewSize or NewRatio is set on the command line, 1065 // assume the user is trying to set the size of the young gen. 1066 1067 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1068 1069 // Set MaxNewSize to our calculated preferred_max_new_size unless 1070 // NewSize was set on the command line and it is larger than 1071 // preferred_max_new_size. 1072 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1073 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1074 } else { 1075 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1076 } 1077 if (PrintGCDetails && Verbose) { 1078 // Too early to use gclog_or_tty 1079 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1080 } 1081 1082 // Unless explicitly requested otherwise, prefer a large 1083 // Old to Young gen size so as to shift the collection load 1084 // to the old generation concurrent collector 1085 1086 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio) 1087 // then NewSize and OldSize may be calculated. That would 1088 // generally lead to some differences with ParNewGC for which 1089 // there was no obvious reason. Also limit to the case where 1090 // MaxNewSize has not been set. 1091 1092 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio)); 1093 1094 // Code along this path potentially sets NewSize and OldSize 1095 1096 // Calculate the desired minimum size of the young gen but if 1097 // NewSize has been set on the command line, use it here since 1098 // it should be the final value. 1099 size_t min_new; 1100 if (FLAG_IS_DEFAULT(NewSize)) { 1101 min_new = align_size_up(ScaleForWordSize(min_new_default), 1102 os::vm_page_size()); 1103 } else { 1104 min_new = NewSize; 1105 } 1106 size_t prev_initial_size = InitialHeapSize; 1107 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) { 1108 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize); 1109 // Currently minimum size and the initial heap sizes are the same. 1110 set_min_heap_size(InitialHeapSize); 1111 if (PrintGCDetails && Verbose) { 1112 warning("Initial heap size increased to " SIZE_FORMAT " M from " 1113 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.", 1114 InitialHeapSize/M, prev_initial_size/M); 1115 } 1116 } 1117 1118 // MaxHeapSize is aligned down in collectorPolicy 1119 size_t max_heap = 1120 align_size_down(MaxHeapSize, 1121 CardTableRS::ct_max_alignment_constraint()); 1122 1123 if (PrintGCDetails && Verbose) { 1124 // Too early to use gclog_or_tty 1125 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1126 " initial_heap_size: " SIZE_FORMAT 1127 " max_heap: " SIZE_FORMAT, 1128 min_heap_size(), InitialHeapSize, max_heap); 1129 } 1130 if (max_heap > min_new) { 1131 // Unless explicitly requested otherwise, make young gen 1132 // at least min_new, and at most preferred_max_new_size. 1133 if (FLAG_IS_DEFAULT(NewSize)) { 1134 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1135 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1136 if (PrintGCDetails && Verbose) { 1137 // Too early to use gclog_or_tty 1138 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize); 1139 } 1140 } 1141 // Unless explicitly requested otherwise, size old gen 1142 // so that it's at least 3X of NewSize to begin with; 1143 // later NewRatio will decide how it grows; see above. 1144 if (FLAG_IS_DEFAULT(OldSize)) { 1145 if (max_heap > NewSize) { 1146 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize)); 1147 if (PrintGCDetails && Verbose) { 1148 // Too early to use gclog_or_tty 1149 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize); 1150 } 1151 } 1152 } 1153 } 1154 } 1155 // Unless explicitly requested otherwise, definitely 1156 // promote all objects surviving "tenuring_default" scavenges. 1157 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1158 FLAG_IS_DEFAULT(SurvivorRatio)) { 1159 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1160 } 1161 // If we decided above (or user explicitly requested) 1162 // `promote all' (via MaxTenuringThreshold := 0), 1163 // prefer minuscule survivor spaces so as not to waste 1164 // space for (non-existent) survivors 1165 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1166 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1167 } 1168 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1169 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1170 // This is done in order to make ParNew+CMS configuration to work 1171 // with YoungPLABSize and OldPLABSize options. 1172 // See CR 6362902. 1173 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1174 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1175 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1176 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1177 // the value (either from the command line or ergonomics) of 1178 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1179 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1180 } 1181 else { 1182 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1183 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1184 // we'll let it to take precedence. 1185 jio_fprintf(defaultStream::error_stream(), 1186 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1187 " options are specified for the CMS collector." 1188 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1189 } 1190 } 1191 } 1192 1193 inline uintx max_heap_for_compressed_oops() { 1194 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1195 NOT_LP64(ShouldNotReachHere(); return 0); 1196 } 1197 1198 bool Arguments::should_auto_select_low_pause_collector() { 1199 if (UseAutoGCSelectPolicy && 1200 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1201 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1202 if (PrintGCDetails) { 1203 // Cannot use gclog_or_tty yet. 1204 tty->print_cr("Automatic selection of the low pause collector" 1205 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1206 } 1207 return true; 1208 } 1209 return false; 1210 } 1211 1212 void Arguments::set_ergonomics_flags() { 1213 // Parallel GC is not compatible with sharing. If one specifies 1214 // that they want sharing explicitly, do not set ergonomics flags. 1215 if (DumpSharedSpaces || ForceSharedSpaces) { 1216 return; 1217 } 1218 1219 if (os::is_server_class_machine() && !force_client_mode ) { 1220 // If no other collector is requested explicitly, 1221 // let the VM select the collector based on 1222 // machine class and automatic selection policy. 1223 if (!UseSerialGC && 1224 !UseConcMarkSweepGC && 1225 !UseG1GC && 1226 !UseParNewGC && 1227 !DumpSharedSpaces && 1228 FLAG_IS_DEFAULT(UseParallelGC)) { 1229 if (should_auto_select_low_pause_collector()) { 1230 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1231 } else { 1232 FLAG_SET_ERGO(bool, UseParallelGC, true); 1233 } 1234 no_shared_spaces(); 1235 } 1236 } 1237 1238 #ifndef ZERO 1239 #ifdef _LP64 1240 // Check that UseCompressedOops can be set with the max heap size allocated 1241 // by ergonomics. 1242 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1243 #ifndef COMPILER1 1244 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) { 1245 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1246 } 1247 #endif 1248 #ifdef _WIN64 1249 if (UseLargePages && UseCompressedOops) { 1250 // Cannot allocate guard pages for implicit checks in indexed addressing 1251 // mode, when large pages are specified on windows. 1252 // This flag could be switched ON if narrow oop base address is set to 0, 1253 // see code in Universe::initialize_heap(). 1254 Universe::set_narrow_oop_use_implicit_null_checks(false); 1255 } 1256 #endif // _WIN64 1257 } else { 1258 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1259 warning("Max heap size too large for Compressed Oops"); 1260 FLAG_SET_DEFAULT(UseCompressedOops, false); 1261 } 1262 } 1263 // Also checks that certain machines are slower with compressed oops 1264 // in vm_version initialization code. 1265 #endif // _LP64 1266 #endif // !ZERO 1267 } 1268 1269 void Arguments::set_parallel_gc_flags() { 1270 assert(UseParallelGC || UseParallelOldGC, "Error"); 1271 // If parallel old was requested, automatically enable parallel scavenge. 1272 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) { 1273 FLAG_SET_DEFAULT(UseParallelGC, true); 1274 } 1275 1276 // If no heap maximum was requested explicitly, use some reasonable fraction 1277 // of the physical memory, up to a maximum of 1GB. 1278 if (UseParallelGC) { 1279 FLAG_SET_ERGO(uintx, ParallelGCThreads, 1280 Abstract_VM_Version::parallel_worker_threads()); 1281 1282 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1283 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1284 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1285 // See CR 6362902 for details. 1286 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1287 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1288 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1289 } 1290 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1291 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1292 } 1293 } 1294 1295 if (UseParallelOldGC) { 1296 // Par compact uses lower default values since they are treated as 1297 // minimums. These are different defaults because of the different 1298 // interpretation and are not ergonomically set. 1299 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1300 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1301 } 1302 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1303 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1304 } 1305 } 1306 } 1307 } 1308 1309 void Arguments::set_g1_gc_flags() { 1310 assert(UseG1GC, "Error"); 1311 #ifdef COMPILER1 1312 FastTLABRefill = false; 1313 #endif 1314 FLAG_SET_DEFAULT(ParallelGCThreads, 1315 Abstract_VM_Version::parallel_worker_threads()); 1316 if (ParallelGCThreads == 0) { 1317 FLAG_SET_DEFAULT(ParallelGCThreads, 1318 Abstract_VM_Version::parallel_worker_threads()); 1319 } 1320 no_shared_spaces(); 1321 1322 // Set the maximum pause time goal to be a reasonable default. 1323 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1324 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1325 } 1326 } 1327 1328 void Arguments::set_heap_size() { 1329 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1330 // Deprecated flag 1331 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1332 } 1333 1334 const julong phys_mem = 1335 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1336 : (julong)MaxRAM; 1337 1338 // If the maximum heap size has not been set with -Xmx, 1339 // then set it as fraction of the size of physical memory, 1340 // respecting the maximum and minimum sizes of the heap. 1341 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1342 julong reasonable_max = phys_mem / MaxRAMFraction; 1343 1344 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1345 // Small physical memory, so use a minimum fraction of it for the heap 1346 reasonable_max = phys_mem / MinRAMFraction; 1347 } else { 1348 // Not-small physical memory, so require a heap at least 1349 // as large as MaxHeapSize 1350 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1351 } 1352 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1353 // Limit the heap size to ErgoHeapSizeLimit 1354 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1355 } 1356 if (UseCompressedOops) { 1357 // Limit the heap size to the maximum possible when using compressed oops 1358 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops()); 1359 } 1360 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1361 1362 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1363 // An initial heap size was specified on the command line, 1364 // so be sure that the maximum size is consistent. Done 1365 // after call to allocatable_physical_memory because that 1366 // method might reduce the allocation size. 1367 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1368 } 1369 1370 if (PrintGCDetails && Verbose) { 1371 // Cannot use gclog_or_tty yet. 1372 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1373 } 1374 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1375 } 1376 1377 // If the initial_heap_size has not been set with InitialHeapSize 1378 // or -Xms, then set it as fraction of the size of physical memory, 1379 // respecting the maximum and minimum sizes of the heap. 1380 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1381 julong reasonable_minimum = (julong)(OldSize + NewSize); 1382 1383 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1384 1385 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1386 1387 julong reasonable_initial = phys_mem / InitialRAMFraction; 1388 1389 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1390 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1391 1392 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1393 1394 if (PrintGCDetails && Verbose) { 1395 // Cannot use gclog_or_tty yet. 1396 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1397 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1398 } 1399 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1400 set_min_heap_size((uintx)reasonable_minimum); 1401 } 1402 } 1403 1404 // This must be called after ergonomics because we want bytecode rewriting 1405 // if the server compiler is used, or if UseSharedSpaces is disabled. 1406 void Arguments::set_bytecode_flags() { 1407 // Better not attempt to store into a read-only space. 1408 if (UseSharedSpaces) { 1409 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1410 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1411 } 1412 1413 if (!RewriteBytecodes) { 1414 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1415 } 1416 } 1417 1418 // Aggressive optimization flags -XX:+AggressiveOpts 1419 void Arguments::set_aggressive_opts_flags() { 1420 #ifdef COMPILER2 1421 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1422 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1423 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1424 } 1425 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1426 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1427 } 1428 1429 // Feed the cache size setting into the JDK 1430 char buffer[1024]; 1431 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1432 add_property(buffer); 1433 } 1434 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1435 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1436 } 1437 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1438 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1439 } 1440 #endif 1441 1442 if (AggressiveOpts) { 1443 // Sample flag setting code 1444 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1445 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1446 // } 1447 } 1448 } 1449 1450 //=========================================================================================================== 1451 // Parsing of java.compiler property 1452 1453 void Arguments::process_java_compiler_argument(char* arg) { 1454 // For backwards compatibility, Djava.compiler=NONE or "" 1455 // causes us to switch to -Xint mode UNLESS -Xdebug 1456 // is also specified. 1457 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1458 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1459 } 1460 } 1461 1462 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1463 _sun_java_launcher = strdup(launcher); 1464 } 1465 1466 bool Arguments::created_by_java_launcher() { 1467 assert(_sun_java_launcher != NULL, "property must have value"); 1468 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1469 } 1470 1471 //=========================================================================================================== 1472 // Parsing of main arguments 1473 1474 bool Arguments::verify_percentage(uintx value, const char* name) { 1475 if (value <= 100) { 1476 return true; 1477 } 1478 jio_fprintf(defaultStream::error_stream(), 1479 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1480 name, value); 1481 return false; 1482 } 1483 1484 static void force_serial_gc() { 1485 FLAG_SET_DEFAULT(UseSerialGC, true); 1486 FLAG_SET_DEFAULT(UseParNewGC, false); 1487 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1488 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1489 FLAG_SET_DEFAULT(UseParallelGC, false); 1490 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1491 FLAG_SET_DEFAULT(UseG1GC, false); 1492 } 1493 1494 static bool verify_serial_gc_flags() { 1495 return (UseSerialGC && 1496 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1497 UseParallelGC || UseParallelOldGC)); 1498 } 1499 1500 // Check consistency of GC selection 1501 bool Arguments::check_gc_consistency() { 1502 bool status = true; 1503 // Ensure that the user has not selected conflicting sets 1504 // of collectors. [Note: this check is merely a user convenience; 1505 // collectors over-ride each other so that only a non-conflicting 1506 // set is selected; however what the user gets is not what they 1507 // may have expected from the combination they asked for. It's 1508 // better to reduce user confusion by not allowing them to 1509 // select conflicting combinations. 1510 uint i = 0; 1511 if (UseSerialGC) i++; 1512 if (UseConcMarkSweepGC || UseParNewGC) i++; 1513 if (UseParallelGC || UseParallelOldGC) i++; 1514 if (UseG1GC) i++; 1515 if (i > 1) { 1516 jio_fprintf(defaultStream::error_stream(), 1517 "Conflicting collector combinations in option list; " 1518 "please refer to the release notes for the combinations " 1519 "allowed\n"); 1520 status = false; 1521 } 1522 1523 return status; 1524 } 1525 1526 // Check the consistency of vm_init_args 1527 bool Arguments::check_vm_args_consistency() { 1528 // Method for adding checks for flag consistency. 1529 // The intent is to warn the user of all possible conflicts, 1530 // before returning an error. 1531 // Note: Needs platform-dependent factoring. 1532 bool status = true; 1533 1534 #if ( (defined(COMPILER2) && defined(SPARC))) 1535 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1536 // on sparc doesn't require generation of a stub as is the case on, e.g., 1537 // x86. Normally, VM_Version_init must be called from init_globals in 1538 // init.cpp, which is called by the initial java thread *after* arguments 1539 // have been parsed. VM_Version_init gets called twice on sparc. 1540 extern void VM_Version_init(); 1541 VM_Version_init(); 1542 if (!VM_Version::has_v9()) { 1543 jio_fprintf(defaultStream::error_stream(), 1544 "V8 Machine detected, Server requires V9\n"); 1545 status = false; 1546 } 1547 #endif /* COMPILER2 && SPARC */ 1548 1549 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1550 // builds so the cost of stack banging can be measured. 1551 #if (defined(PRODUCT) && defined(SOLARIS)) 1552 if (!UseBoundThreads && !UseStackBanging) { 1553 jio_fprintf(defaultStream::error_stream(), 1554 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1555 1556 status = false; 1557 } 1558 #endif 1559 1560 if (TLABRefillWasteFraction == 0) { 1561 jio_fprintf(defaultStream::error_stream(), 1562 "TLABRefillWasteFraction should be a denominator, " 1563 "not " SIZE_FORMAT "\n", 1564 TLABRefillWasteFraction); 1565 status = false; 1566 } 1567 1568 status = status && verify_percentage(MaxLiveObjectEvacuationRatio, 1569 "MaxLiveObjectEvacuationRatio"); 1570 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1571 "AdaptiveSizePolicyWeight"); 1572 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1573 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1574 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1575 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1576 1577 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1578 jio_fprintf(defaultStream::error_stream(), 1579 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1580 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1581 MinHeapFreeRatio, MaxHeapFreeRatio); 1582 status = false; 1583 } 1584 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1585 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1586 1587 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1588 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1589 } 1590 1591 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1592 // Settings to encourage splitting. 1593 if (!FLAG_IS_CMDLINE(NewRatio)) { 1594 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1595 } 1596 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1597 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1598 } 1599 } 1600 1601 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1602 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1603 if (GCTimeLimit == 100) { 1604 // Turn off gc-overhead-limit-exceeded checks 1605 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1606 } 1607 1608 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1609 1610 // Check user specified sharing option conflict with Parallel GC 1611 bool cannot_share = ((UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || UseParNewGC || 1612 UseParallelGC || UseParallelOldGC || 1613 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages)); 1614 1615 if (cannot_share) { 1616 // Either force sharing on by forcing the other options off, or 1617 // force sharing off. 1618 if (DumpSharedSpaces || ForceSharedSpaces) { 1619 jio_fprintf(defaultStream::error_stream(), 1620 "Reverting to Serial GC because of %s\n", 1621 ForceSharedSpaces ? " -Xshare:on" : "-Xshare:dump"); 1622 force_serial_gc(); 1623 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false); 1624 } else { 1625 if (UseSharedSpaces && Verbose) { 1626 jio_fprintf(defaultStream::error_stream(), 1627 "Turning off use of shared archive because of " 1628 "choice of garbage collector or large pages\n"); 1629 } 1630 no_shared_spaces(); 1631 } 1632 } 1633 1634 status = status && check_gc_consistency(); 1635 1636 if (_has_alloc_profile) { 1637 if (UseParallelGC || UseParallelOldGC) { 1638 jio_fprintf(defaultStream::error_stream(), 1639 "error: invalid argument combination.\n" 1640 "Allocation profiling (-Xaprof) cannot be used together with " 1641 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1642 status = false; 1643 } 1644 if (UseConcMarkSweepGC) { 1645 jio_fprintf(defaultStream::error_stream(), 1646 "error: invalid argument combination.\n" 1647 "Allocation profiling (-Xaprof) cannot be used together with " 1648 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1649 status = false; 1650 } 1651 } 1652 1653 if (CMSIncrementalMode) { 1654 if (!UseConcMarkSweepGC) { 1655 jio_fprintf(defaultStream::error_stream(), 1656 "error: invalid argument combination.\n" 1657 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1658 "selected in order\nto use CMSIncrementalMode.\n"); 1659 status = false; 1660 } else { 1661 status = status && verify_percentage(CMSIncrementalDutyCycle, 1662 "CMSIncrementalDutyCycle"); 1663 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1664 "CMSIncrementalDutyCycleMin"); 1665 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1666 "CMSIncrementalSafetyFactor"); 1667 status = status && verify_percentage(CMSIncrementalOffset, 1668 "CMSIncrementalOffset"); 1669 status = status && verify_percentage(CMSExpAvgFactor, 1670 "CMSExpAvgFactor"); 1671 // If it was not set on the command line, set 1672 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1673 if (CMSInitiatingOccupancyFraction < 0) { 1674 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1675 } 1676 } 1677 } 1678 1679 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1680 // insists that we hold the requisite locks so that the iteration is 1681 // MT-safe. For the verification at start-up and shut-down, we don't 1682 // yet have a good way of acquiring and releasing these locks, 1683 // which are not visible at the CollectedHeap level. We want to 1684 // be able to acquire these locks and then do the iteration rather 1685 // than just disable the lock verification. This will be fixed under 1686 // bug 4788986. 1687 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1688 if (VerifyGCStartAt == 0) { 1689 warning("Heap verification at start-up disabled " 1690 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1691 VerifyGCStartAt = 1; // Disable verification at start-up 1692 } 1693 if (VerifyBeforeExit) { 1694 warning("Heap verification at shutdown disabled " 1695 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1696 VerifyBeforeExit = false; // Disable verification at shutdown 1697 } 1698 } 1699 1700 // Note: only executed in non-PRODUCT mode 1701 if (!UseAsyncConcMarkSweepGC && 1702 (ExplicitGCInvokesConcurrent || 1703 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1704 jio_fprintf(defaultStream::error_stream(), 1705 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1706 " with -UseAsyncConcMarkSweepGC"); 1707 status = false; 1708 } 1709 1710 return status; 1711 } 1712 1713 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1714 const char* option_type) { 1715 if (ignore) return false; 1716 1717 const char* spacer = " "; 1718 if (option_type == NULL) { 1719 option_type = ++spacer; // Set both to the empty string. 1720 } 1721 1722 if (os::obsolete_option(option)) { 1723 jio_fprintf(defaultStream::error_stream(), 1724 "Obsolete %s%soption: %s\n", option_type, spacer, 1725 option->optionString); 1726 return false; 1727 } else { 1728 jio_fprintf(defaultStream::error_stream(), 1729 "Unrecognized %s%soption: %s\n", option_type, spacer, 1730 option->optionString); 1731 return true; 1732 } 1733 } 1734 1735 static const char* user_assertion_options[] = { 1736 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1737 }; 1738 1739 static const char* system_assertion_options[] = { 1740 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1741 }; 1742 1743 // Return true if any of the strings in null-terminated array 'names' matches. 1744 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 1745 // the option must match exactly. 1746 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 1747 bool tail_allowed) { 1748 for (/* empty */; *names != NULL; ++names) { 1749 if (match_option(option, *names, tail)) { 1750 if (**tail == '\0' || tail_allowed && **tail == ':') { 1751 return true; 1752 } 1753 } 1754 } 1755 return false; 1756 } 1757 1758 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1759 julong* long_arg, 1760 julong min_size) { 1761 if (!atomull(s, long_arg)) return arg_unreadable; 1762 return check_memory_size(*long_arg, min_size); 1763 } 1764 1765 // Parse JavaVMInitArgs structure 1766 1767 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 1768 // For components of the system classpath. 1769 SysClassPath scp(Arguments::get_sysclasspath()); 1770 bool scp_assembly_required = false; 1771 1772 // Save default settings for some mode flags 1773 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1774 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1775 Arguments::_ClipInlining = ClipInlining; 1776 Arguments::_BackgroundCompilation = BackgroundCompilation; 1777 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold; 1778 1779 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 1780 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 1781 if (result != JNI_OK) { 1782 return result; 1783 } 1784 1785 // Parse JavaVMInitArgs structure passed in 1786 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 1787 if (result != JNI_OK) { 1788 return result; 1789 } 1790 1791 if (AggressiveOpts) { 1792 // Insert alt-rt.jar between user-specified bootclasspath 1793 // prefix and the default bootclasspath. os::set_boot_path() 1794 // uses meta_index_dir as the default bootclasspath directory. 1795 const char* altclasses_jar = "alt-rt.jar"; 1796 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 1797 strlen(altclasses_jar); 1798 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 1799 strcpy(altclasses_path, get_meta_index_dir()); 1800 strcat(altclasses_path, altclasses_jar); 1801 scp.add_suffix_to_prefix(altclasses_path); 1802 scp_assembly_required = true; 1803 FREE_C_HEAP_ARRAY(char, altclasses_path); 1804 } 1805 1806 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 1807 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 1808 if (result != JNI_OK) { 1809 return result; 1810 } 1811 1812 // Do final processing now that all arguments have been parsed 1813 result = finalize_vm_init_args(&scp, scp_assembly_required); 1814 if (result != JNI_OK) { 1815 return result; 1816 } 1817 1818 return JNI_OK; 1819 } 1820 1821 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 1822 SysClassPath* scp_p, 1823 bool* scp_assembly_required_p, 1824 FlagValueOrigin origin) { 1825 // Remaining part of option string 1826 const char* tail; 1827 1828 // iterate over arguments 1829 for (int index = 0; index < args->nOptions; index++) { 1830 bool is_absolute_path = false; // for -agentpath vs -agentlib 1831 1832 const JavaVMOption* option = args->options + index; 1833 1834 if (!match_option(option, "-Djava.class.path", &tail) && 1835 !match_option(option, "-Dsun.java.command", &tail) && 1836 !match_option(option, "-Dsun.java.launcher", &tail)) { 1837 1838 // add all jvm options to the jvm_args string. This string 1839 // is used later to set the java.vm.args PerfData string constant. 1840 // the -Djava.class.path and the -Dsun.java.command options are 1841 // omitted from jvm_args string as each have their own PerfData 1842 // string constant object. 1843 build_jvm_args(option->optionString); 1844 } 1845 1846 // -verbose:[class/gc/jni] 1847 if (match_option(option, "-verbose", &tail)) { 1848 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 1849 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 1850 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 1851 } else if (!strcmp(tail, ":gc")) { 1852 FLAG_SET_CMDLINE(bool, PrintGC, true); 1853 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 1854 } else if (!strcmp(tail, ":jni")) { 1855 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 1856 } 1857 // -da / -ea / -disableassertions / -enableassertions 1858 // These accept an optional class/package name separated by a colon, e.g., 1859 // -da:java.lang.Thread. 1860 } else if (match_option(option, user_assertion_options, &tail, true)) { 1861 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 1862 if (*tail == '\0') { 1863 JavaAssertions::setUserClassDefault(enable); 1864 } else { 1865 assert(*tail == ':', "bogus match by match_option()"); 1866 JavaAssertions::addOption(tail + 1, enable); 1867 } 1868 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 1869 } else if (match_option(option, system_assertion_options, &tail, false)) { 1870 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 1871 JavaAssertions::setSystemClassDefault(enable); 1872 // -bootclasspath: 1873 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 1874 scp_p->reset_path(tail); 1875 *scp_assembly_required_p = true; 1876 // -bootclasspath/a: 1877 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 1878 scp_p->add_suffix(tail); 1879 *scp_assembly_required_p = true; 1880 // -bootclasspath/p: 1881 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 1882 scp_p->add_prefix(tail); 1883 *scp_assembly_required_p = true; 1884 // -Xrun 1885 } else if (match_option(option, "-Xrun", &tail)) { 1886 if (tail != NULL) { 1887 const char* pos = strchr(tail, ':'); 1888 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 1889 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 1890 name[len] = '\0'; 1891 1892 char *options = NULL; 1893 if(pos != NULL) { 1894 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 1895 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 1896 } 1897 #ifdef JVMTI_KERNEL 1898 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 1899 warning("profiling and debugging agents are not supported with Kernel VM"); 1900 } else 1901 #endif // JVMTI_KERNEL 1902 add_init_library(name, options); 1903 } 1904 // -agentlib and -agentpath 1905 } else if (match_option(option, "-agentlib:", &tail) || 1906 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 1907 if(tail != NULL) { 1908 const char* pos = strchr(tail, '='); 1909 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 1910 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 1911 name[len] = '\0'; 1912 1913 char *options = NULL; 1914 if(pos != NULL) { 1915 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 1916 } 1917 #ifdef JVMTI_KERNEL 1918 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 1919 warning("profiling and debugging agents are not supported with Kernel VM"); 1920 } else 1921 #endif // JVMTI_KERNEL 1922 add_init_agent(name, options, is_absolute_path); 1923 1924 } 1925 // -javaagent 1926 } else if (match_option(option, "-javaagent:", &tail)) { 1927 if(tail != NULL) { 1928 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 1929 add_init_agent("instrument", options, false); 1930 } 1931 // -Xnoclassgc 1932 } else if (match_option(option, "-Xnoclassgc", &tail)) { 1933 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 1934 // -Xincgc: i-CMS 1935 } else if (match_option(option, "-Xincgc", &tail)) { 1936 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 1937 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 1938 // -Xnoincgc: no i-CMS 1939 } else if (match_option(option, "-Xnoincgc", &tail)) { 1940 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 1941 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 1942 // -Xconcgc 1943 } else if (match_option(option, "-Xconcgc", &tail)) { 1944 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 1945 // -Xnoconcgc 1946 } else if (match_option(option, "-Xnoconcgc", &tail)) { 1947 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 1948 // -Xbatch 1949 } else if (match_option(option, "-Xbatch", &tail)) { 1950 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 1951 // -Xmn for compatibility with other JVM vendors 1952 } else if (match_option(option, "-Xmn", &tail)) { 1953 julong long_initial_eden_size = 0; 1954 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 1955 if (errcode != arg_in_range) { 1956 jio_fprintf(defaultStream::error_stream(), 1957 "Invalid initial eden size: %s\n", option->optionString); 1958 describe_range_error(errcode); 1959 return JNI_EINVAL; 1960 } 1961 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 1962 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 1963 // -Xms 1964 } else if (match_option(option, "-Xms", &tail)) { 1965 julong long_initial_heap_size = 0; 1966 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 1967 if (errcode != arg_in_range) { 1968 jio_fprintf(defaultStream::error_stream(), 1969 "Invalid initial heap size: %s\n", option->optionString); 1970 describe_range_error(errcode); 1971 return JNI_EINVAL; 1972 } 1973 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 1974 // Currently the minimum size and the initial heap sizes are the same. 1975 set_min_heap_size(InitialHeapSize); 1976 // -Xmx 1977 } else if (match_option(option, "-Xmx", &tail)) { 1978 julong long_max_heap_size = 0; 1979 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 1980 if (errcode != arg_in_range) { 1981 jio_fprintf(defaultStream::error_stream(), 1982 "Invalid maximum heap size: %s\n", option->optionString); 1983 describe_range_error(errcode); 1984 return JNI_EINVAL; 1985 } 1986 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 1987 // Xmaxf 1988 } else if (match_option(option, "-Xmaxf", &tail)) { 1989 int maxf = (int)(atof(tail) * 100); 1990 if (maxf < 0 || maxf > 100) { 1991 jio_fprintf(defaultStream::error_stream(), 1992 "Bad max heap free percentage size: %s\n", 1993 option->optionString); 1994 return JNI_EINVAL; 1995 } else { 1996 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 1997 } 1998 // Xminf 1999 } else if (match_option(option, "-Xminf", &tail)) { 2000 int minf = (int)(atof(tail) * 100); 2001 if (minf < 0 || minf > 100) { 2002 jio_fprintf(defaultStream::error_stream(), 2003 "Bad min heap free percentage size: %s\n", 2004 option->optionString); 2005 return JNI_EINVAL; 2006 } else { 2007 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2008 } 2009 // -Xss 2010 } else if (match_option(option, "-Xss", &tail)) { 2011 julong long_ThreadStackSize = 0; 2012 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2013 if (errcode != arg_in_range) { 2014 jio_fprintf(defaultStream::error_stream(), 2015 "Invalid thread stack size: %s\n", option->optionString); 2016 describe_range_error(errcode); 2017 return JNI_EINVAL; 2018 } 2019 // Internally track ThreadStackSize in units of 1024 bytes. 2020 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2021 round_to((int)long_ThreadStackSize, K) / K); 2022 // -Xoss 2023 } else if (match_option(option, "-Xoss", &tail)) { 2024 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2025 // -Xmaxjitcodesize 2026 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) { 2027 julong long_ReservedCodeCacheSize = 0; 2028 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2029 (size_t)InitialCodeCacheSize); 2030 if (errcode != arg_in_range) { 2031 jio_fprintf(defaultStream::error_stream(), 2032 "Invalid maximum code cache size: %s\n", 2033 option->optionString); 2034 describe_range_error(errcode); 2035 return JNI_EINVAL; 2036 } 2037 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2038 // -green 2039 } else if (match_option(option, "-green", &tail)) { 2040 jio_fprintf(defaultStream::error_stream(), 2041 "Green threads support not available\n"); 2042 return JNI_EINVAL; 2043 // -native 2044 } else if (match_option(option, "-native", &tail)) { 2045 // HotSpot always uses native threads, ignore silently for compatibility 2046 // -Xsqnopause 2047 } else if (match_option(option, "-Xsqnopause", &tail)) { 2048 // EVM option, ignore silently for compatibility 2049 // -Xrs 2050 } else if (match_option(option, "-Xrs", &tail)) { 2051 // Classic/EVM option, new functionality 2052 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2053 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2054 // change default internal VM signals used - lower case for back compat 2055 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2056 // -Xoptimize 2057 } else if (match_option(option, "-Xoptimize", &tail)) { 2058 // EVM option, ignore silently for compatibility 2059 // -Xprof 2060 } else if (match_option(option, "-Xprof", &tail)) { 2061 #ifndef FPROF_KERNEL 2062 _has_profile = true; 2063 #else // FPROF_KERNEL 2064 // do we have to exit? 2065 warning("Kernel VM does not support flat profiling."); 2066 #endif // FPROF_KERNEL 2067 // -Xaprof 2068 } else if (match_option(option, "-Xaprof", &tail)) { 2069 _has_alloc_profile = true; 2070 // -Xconcurrentio 2071 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2072 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2073 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2074 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2075 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2076 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2077 2078 // -Xinternalversion 2079 } else if (match_option(option, "-Xinternalversion", &tail)) { 2080 jio_fprintf(defaultStream::output_stream(), "%s\n", 2081 VM_Version::internal_vm_info_string()); 2082 vm_exit(0); 2083 #ifndef PRODUCT 2084 // -Xprintflags 2085 } else if (match_option(option, "-Xprintflags", &tail)) { 2086 CommandLineFlags::printFlags(); 2087 vm_exit(0); 2088 #endif 2089 // -D 2090 } else if (match_option(option, "-D", &tail)) { 2091 if (!add_property(tail)) { 2092 return JNI_ENOMEM; 2093 } 2094 // Out of the box management support 2095 if (match_option(option, "-Dcom.sun.management", &tail)) { 2096 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2097 } 2098 // -Xint 2099 } else if (match_option(option, "-Xint", &tail)) { 2100 set_mode_flags(_int); 2101 // -Xmixed 2102 } else if (match_option(option, "-Xmixed", &tail)) { 2103 set_mode_flags(_mixed); 2104 // -Xcomp 2105 } else if (match_option(option, "-Xcomp", &tail)) { 2106 // for testing the compiler; turn off all flags that inhibit compilation 2107 set_mode_flags(_comp); 2108 2109 // -Xshare:dump 2110 } else if (match_option(option, "-Xshare:dump", &tail)) { 2111 #ifdef TIERED 2112 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2113 set_mode_flags(_int); // Prevent compilation, which creates objects 2114 #elif defined(COMPILER2) 2115 vm_exit_during_initialization( 2116 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2117 #elif defined(KERNEL) 2118 vm_exit_during_initialization( 2119 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2120 #else 2121 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2122 set_mode_flags(_int); // Prevent compilation, which creates objects 2123 #endif 2124 // -Xshare:on 2125 } else if (match_option(option, "-Xshare:on", &tail)) { 2126 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2127 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2128 #ifdef TIERED 2129 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true); 2130 #endif // TIERED 2131 // -Xshare:auto 2132 } else if (match_option(option, "-Xshare:auto", &tail)) { 2133 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2134 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2135 // -Xshare:off 2136 } else if (match_option(option, "-Xshare:off", &tail)) { 2137 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2138 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2139 2140 // -Xverify 2141 } else if (match_option(option, "-Xverify", &tail)) { 2142 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2143 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2144 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2145 } else if (strcmp(tail, ":remote") == 0) { 2146 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2147 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2148 } else if (strcmp(tail, ":none") == 0) { 2149 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2150 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2151 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2152 return JNI_EINVAL; 2153 } 2154 // -Xdebug 2155 } else if (match_option(option, "-Xdebug", &tail)) { 2156 // note this flag has been used, then ignore 2157 set_xdebug_mode(true); 2158 // -Xnoagent 2159 } else if (match_option(option, "-Xnoagent", &tail)) { 2160 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2161 } else if (match_option(option, "-Xboundthreads", &tail)) { 2162 // Bind user level threads to kernel threads (Solaris only) 2163 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2164 } else if (match_option(option, "-Xloggc:", &tail)) { 2165 // Redirect GC output to the file. -Xloggc:<filename> 2166 // ostream_init_log(), when called will use this filename 2167 // to initialize a fileStream. 2168 _gc_log_filename = strdup(tail); 2169 FLAG_SET_CMDLINE(bool, PrintGC, true); 2170 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2171 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2172 2173 // JNI hooks 2174 } else if (match_option(option, "-Xcheck", &tail)) { 2175 if (!strcmp(tail, ":jni")) { 2176 CheckJNICalls = true; 2177 } else if (is_bad_option(option, args->ignoreUnrecognized, 2178 "check")) { 2179 return JNI_EINVAL; 2180 } 2181 } else if (match_option(option, "vfprintf", &tail)) { 2182 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2183 } else if (match_option(option, "exit", &tail)) { 2184 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2185 } else if (match_option(option, "abort", &tail)) { 2186 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2187 // -XX:+AggressiveHeap 2188 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2189 2190 // This option inspects the machine and attempts to set various 2191 // parameters to be optimal for long-running, memory allocation 2192 // intensive jobs. It is intended for machines with large 2193 // amounts of cpu and memory. 2194 2195 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2196 // VM, but we may not be able to represent the total physical memory 2197 // available (like having 8gb of memory on a box but using a 32bit VM). 2198 // Thus, we need to make sure we're using a julong for intermediate 2199 // calculations. 2200 julong initHeapSize; 2201 julong total_memory = os::physical_memory(); 2202 2203 if (total_memory < (julong)256*M) { 2204 jio_fprintf(defaultStream::error_stream(), 2205 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2206 vm_exit(1); 2207 } 2208 2209 // The heap size is half of available memory, or (at most) 2210 // all of possible memory less 160mb (leaving room for the OS 2211 // when using ISM). This is the maximum; because adaptive sizing 2212 // is turned on below, the actual space used may be smaller. 2213 2214 initHeapSize = MIN2(total_memory / (julong)2, 2215 total_memory - (julong)160*M); 2216 2217 // Make sure that if we have a lot of memory we cap the 32 bit 2218 // process space. The 64bit VM version of this function is a nop. 2219 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2220 2221 // The perm gen is separate but contiguous with the 2222 // object heap (and is reserved with it) so subtract it 2223 // from the heap size. 2224 if (initHeapSize > MaxPermSize) { 2225 initHeapSize = initHeapSize - MaxPermSize; 2226 } else { 2227 warning("AggressiveHeap and MaxPermSize values may conflict"); 2228 } 2229 2230 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2231 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2232 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2233 // Currently the minimum size and the initial heap sizes are the same. 2234 set_min_heap_size(initHeapSize); 2235 } 2236 if (FLAG_IS_DEFAULT(NewSize)) { 2237 // Make the young generation 3/8ths of the total heap. 2238 FLAG_SET_CMDLINE(uintx, NewSize, 2239 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2240 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2241 } 2242 2243 FLAG_SET_DEFAULT(UseLargePages, true); 2244 2245 // Increase some data structure sizes for efficiency 2246 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2247 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2248 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2249 2250 // See the OldPLABSize comment below, but replace 'after promotion' 2251 // with 'after copying'. YoungPLABSize is the size of the survivor 2252 // space per-gc-thread buffers. The default is 4kw. 2253 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2254 2255 // OldPLABSize is the size of the buffers in the old gen that 2256 // UseParallelGC uses to promote live data that doesn't fit in the 2257 // survivor spaces. At any given time, there's one for each gc thread. 2258 // The default size is 1kw. These buffers are rarely used, since the 2259 // survivor spaces are usually big enough. For specjbb, however, there 2260 // are occasions when there's lots of live data in the young gen 2261 // and we end up promoting some of it. We don't have a definite 2262 // explanation for why bumping OldPLABSize helps, but the theory 2263 // is that a bigger PLAB results in retaining something like the 2264 // original allocation order after promotion, which improves mutator 2265 // locality. A minor effect may be that larger PLABs reduce the 2266 // number of PLAB allocation events during gc. The value of 8kw 2267 // was arrived at by experimenting with specjbb. 2268 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2269 2270 // CompilationPolicyChoice=0 causes the server compiler to adopt 2271 // a more conservative which-method-do-I-compile policy when one 2272 // of the counters maintained by the interpreter trips. The 2273 // result is reduced startup time and improved specjbb and 2274 // alacrity performance. Zero is the default, but we set it 2275 // explicitly here in case the default changes. 2276 // See runtime/compilationPolicy.*. 2277 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2278 2279 // Enable parallel GC and adaptive generation sizing 2280 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2281 FLAG_SET_DEFAULT(ParallelGCThreads, 2282 Abstract_VM_Version::parallel_worker_threads()); 2283 2284 // Encourage steady state memory management 2285 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2286 2287 // This appears to improve mutator locality 2288 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2289 2290 // Get around early Solaris scheduling bug 2291 // (affinity vs other jobs on system) 2292 // but disallow DR and offlining (5008695). 2293 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2294 2295 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2296 // The last option must always win. 2297 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2298 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2299 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2300 // The last option must always win. 2301 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2302 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2303 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2304 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2305 jio_fprintf(defaultStream::error_stream(), 2306 "Please use CMSClassUnloadingEnabled in place of " 2307 "CMSPermGenSweepingEnabled in the future\n"); 2308 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2309 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2310 jio_fprintf(defaultStream::error_stream(), 2311 "Please use -XX:+UseGCOverheadLimit in place of " 2312 "-XX:+UseGCTimeLimit in the future\n"); 2313 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2314 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2315 jio_fprintf(defaultStream::error_stream(), 2316 "Please use -XX:-UseGCOverheadLimit in place of " 2317 "-XX:-UseGCTimeLimit in the future\n"); 2318 // The TLE options are for compatibility with 1.3 and will be 2319 // removed without notice in a future release. These options 2320 // are not to be documented. 2321 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2322 // No longer used. 2323 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2324 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2325 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2326 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2327 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2328 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2329 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2330 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2331 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2332 // No longer used. 2333 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2334 julong long_tlab_size = 0; 2335 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2336 if (errcode != arg_in_range) { 2337 jio_fprintf(defaultStream::error_stream(), 2338 "Invalid TLAB size: %s\n", option->optionString); 2339 describe_range_error(errcode); 2340 return JNI_EINVAL; 2341 } 2342 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2343 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2344 // No longer used. 2345 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2346 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2347 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2348 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2349 SOLARIS_ONLY( 2350 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2351 warning("-XX:+UsePermISM is obsolete."); 2352 FLAG_SET_CMDLINE(bool, UseISM, true); 2353 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2354 FLAG_SET_CMDLINE(bool, UseISM, false); 2355 ) 2356 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2357 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2358 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2359 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2360 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2361 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2362 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2363 #ifdef SOLARIS 2364 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2365 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2366 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2367 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2368 #else // ndef SOLARIS 2369 jio_fprintf(defaultStream::error_stream(), 2370 "ExtendedDTraceProbes flag is only applicable on Solaris\n"); 2371 return JNI_EINVAL; 2372 #endif // ndef SOLARIS 2373 } else 2374 #ifdef ASSERT 2375 if (match_option(option, "-XX:+FullGCALot", &tail)) { 2376 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2377 // disable scavenge before parallel mark-compact 2378 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2379 } else 2380 #endif 2381 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2382 julong cms_blocks_to_claim = (julong)atol(tail); 2383 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2384 jio_fprintf(defaultStream::error_stream(), 2385 "Please use -XX:CMSParPromoteBlocksToClaim in place of " 2386 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2387 } else 2388 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2389 julong old_plab_size = 0; 2390 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2391 if (errcode != arg_in_range) { 2392 jio_fprintf(defaultStream::error_stream(), 2393 "Invalid old PLAB size: %s\n", option->optionString); 2394 describe_range_error(errcode); 2395 return JNI_EINVAL; 2396 } 2397 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2398 jio_fprintf(defaultStream::error_stream(), 2399 "Please use -XX:OldPLABSize in place of " 2400 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2401 } else 2402 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2403 julong young_plab_size = 0; 2404 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2405 if (errcode != arg_in_range) { 2406 jio_fprintf(defaultStream::error_stream(), 2407 "Invalid young PLAB size: %s\n", option->optionString); 2408 describe_range_error(errcode); 2409 return JNI_EINVAL; 2410 } 2411 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2412 jio_fprintf(defaultStream::error_stream(), 2413 "Please use -XX:YoungPLABSize in place of " 2414 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2415 } else 2416 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2417 // Skip -XX:Flags= since that case has already been handled 2418 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2419 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2420 return JNI_EINVAL; 2421 } 2422 } 2423 // Unknown option 2424 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2425 return JNI_ERR; 2426 } 2427 } 2428 // Change the default value for flags which have different default values 2429 // when working with older JDKs. 2430 if (JDK_Version::current().compare_major(6) <= 0 && 2431 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2432 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2433 } 2434 return JNI_OK; 2435 } 2436 2437 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2438 // This must be done after all -D arguments have been processed. 2439 scp_p->expand_endorsed(); 2440 2441 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2442 // Assemble the bootclasspath elements into the final path. 2443 Arguments::set_sysclasspath(scp_p->combined_path()); 2444 } 2445 2446 // This must be done after all arguments have been processed. 2447 // java_compiler() true means set to "NONE" or empty. 2448 if (java_compiler() && !xdebug_mode()) { 2449 // For backwards compatibility, we switch to interpreted mode if 2450 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2451 // not specified. 2452 set_mode_flags(_int); 2453 } 2454 if (CompileThreshold == 0) { 2455 set_mode_flags(_int); 2456 } 2457 2458 #ifdef TIERED 2459 // If we are using tiered compilation in the tiered vm then c1 will 2460 // do the profiling and we don't want to waste that time in the 2461 // interpreter. 2462 if (TieredCompilation) { 2463 ProfileInterpreter = false; 2464 } else { 2465 // Since we are running vanilla server we must adjust the compile threshold 2466 // unless the user has already adjusted it because the default threshold assumes 2467 // we will run tiered. 2468 2469 if (FLAG_IS_DEFAULT(CompileThreshold)) { 2470 CompileThreshold = Tier2CompileThreshold; 2471 } 2472 } 2473 #endif // TIERED 2474 2475 #ifndef COMPILER2 2476 // Don't degrade server performance for footprint 2477 if (FLAG_IS_DEFAULT(UseLargePages) && 2478 MaxHeapSize < LargePageHeapSizeThreshold) { 2479 // No need for large granularity pages w/small heaps. 2480 // Note that large pages are enabled/disabled for both the 2481 // Java heap and the code cache. 2482 FLAG_SET_DEFAULT(UseLargePages, false); 2483 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2484 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2485 } 2486 2487 #else 2488 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2489 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2490 } 2491 // Temporary disable bulk zeroing reduction with G1. See CR 6627983. 2492 if (UseG1GC) { 2493 FLAG_SET_DEFAULT(ReduceBulkZeroing, false); 2494 } 2495 #endif 2496 2497 if (!check_vm_args_consistency()) { 2498 return JNI_ERR; 2499 } 2500 2501 return JNI_OK; 2502 } 2503 2504 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2505 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2506 scp_assembly_required_p); 2507 } 2508 2509 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2510 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2511 scp_assembly_required_p); 2512 } 2513 2514 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2515 const int N_MAX_OPTIONS = 64; 2516 const int OPTION_BUFFER_SIZE = 1024; 2517 char buffer[OPTION_BUFFER_SIZE]; 2518 2519 // The variable will be ignored if it exceeds the length of the buffer. 2520 // Don't check this variable if user has special privileges 2521 // (e.g. unix su command). 2522 if (os::getenv(name, buffer, sizeof(buffer)) && 2523 !os::have_special_privileges()) { 2524 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2525 jio_fprintf(defaultStream::error_stream(), 2526 "Picked up %s: %s\n", name, buffer); 2527 char* rd = buffer; // pointer to the input string (rd) 2528 int i; 2529 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2530 while (isspace(*rd)) rd++; // skip whitespace 2531 if (*rd == 0) break; // we re done when the input string is read completely 2532 2533 // The output, option string, overwrites the input string. 2534 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2535 // input string (rd). 2536 char* wrt = rd; 2537 2538 options[i++].optionString = wrt; // Fill in option 2539 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2540 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2541 int quote = *rd; // matching quote to look for 2542 rd++; // don't copy open quote 2543 while (*rd != quote) { // include everything (even spaces) up until quote 2544 if (*rd == 0) { // string termination means unmatched string 2545 jio_fprintf(defaultStream::error_stream(), 2546 "Unmatched quote in %s\n", name); 2547 return JNI_ERR; 2548 } 2549 *wrt++ = *rd++; // copy to option string 2550 } 2551 rd++; // don't copy close quote 2552 } else { 2553 *wrt++ = *rd++; // copy to option string 2554 } 2555 } 2556 // Need to check if we're done before writing a NULL, 2557 // because the write could be to the byte that rd is pointing to. 2558 if (*rd++ == 0) { 2559 *wrt = 0; 2560 break; 2561 } 2562 *wrt = 0; // Zero terminate option 2563 } 2564 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2565 JavaVMInitArgs vm_args; 2566 vm_args.version = JNI_VERSION_1_2; 2567 vm_args.options = options; 2568 vm_args.nOptions = i; 2569 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2570 2571 if (PrintVMOptions) { 2572 const char* tail; 2573 for (int i = 0; i < vm_args.nOptions; i++) { 2574 const JavaVMOption *option = vm_args.options + i; 2575 if (match_option(option, "-XX:", &tail)) { 2576 logOption(tail); 2577 } 2578 } 2579 } 2580 2581 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2582 } 2583 return JNI_OK; 2584 } 2585 2586 // Parse entry point called from JNI_CreateJavaVM 2587 2588 jint Arguments::parse(const JavaVMInitArgs* args) { 2589 2590 // Sharing support 2591 // Construct the path to the archive 2592 char jvm_path[JVM_MAXPATHLEN]; 2593 os::jvm_path(jvm_path, sizeof(jvm_path)); 2594 #ifdef TIERED 2595 if (strstr(jvm_path, "client") != NULL) { 2596 force_client_mode = true; 2597 } 2598 #endif // TIERED 2599 char *end = strrchr(jvm_path, *os::file_separator()); 2600 if (end != NULL) *end = '\0'; 2601 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2602 strlen(os::file_separator()) + 20); 2603 if (shared_archive_path == NULL) return JNI_ENOMEM; 2604 strcpy(shared_archive_path, jvm_path); 2605 strcat(shared_archive_path, os::file_separator()); 2606 strcat(shared_archive_path, "classes"); 2607 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2608 strcat(shared_archive_path, ".jsa"); 2609 SharedArchivePath = shared_archive_path; 2610 2611 // Remaining part of option string 2612 const char* tail; 2613 2614 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2615 bool settings_file_specified = false; 2616 const char* flags_file; 2617 int index; 2618 for (index = 0; index < args->nOptions; index++) { 2619 const JavaVMOption *option = args->options + index; 2620 if (match_option(option, "-XX:Flags=", &tail)) { 2621 flags_file = tail; 2622 settings_file_specified = true; 2623 } 2624 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2625 PrintVMOptions = true; 2626 } 2627 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2628 PrintVMOptions = false; 2629 } 2630 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2631 IgnoreUnrecognizedVMOptions = true; 2632 } 2633 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2634 IgnoreUnrecognizedVMOptions = false; 2635 } 2636 } 2637 2638 if (IgnoreUnrecognizedVMOptions) { 2639 // uncast const to modify the flag args->ignoreUnrecognized 2640 *(jboolean*)(&args->ignoreUnrecognized) = true; 2641 } 2642 2643 // Parse specified settings file 2644 if (settings_file_specified) { 2645 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 2646 return JNI_EINVAL; 2647 } 2648 } 2649 2650 // Parse default .hotspotrc settings file 2651 if (!settings_file_specified) { 2652 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 2653 return JNI_EINVAL; 2654 } 2655 } 2656 2657 if (PrintVMOptions) { 2658 for (index = 0; index < args->nOptions; index++) { 2659 const JavaVMOption *option = args->options + index; 2660 if (match_option(option, "-XX:", &tail)) { 2661 logOption(tail); 2662 } 2663 } 2664 } 2665 2666 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 2667 jint result = parse_vm_init_args(args); 2668 if (result != JNI_OK) { 2669 return result; 2670 } 2671 2672 #ifndef PRODUCT 2673 if (TraceBytecodesAt != 0) { 2674 TraceBytecodes = true; 2675 } 2676 if (CountCompiledCalls) { 2677 if (UseCounterDecay) { 2678 warning("UseCounterDecay disabled because CountCalls is set"); 2679 UseCounterDecay = false; 2680 } 2681 } 2682 #endif // PRODUCT 2683 2684 if (EnableInvokeDynamic && !EnableMethodHandles) { 2685 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) { 2686 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true"); 2687 } 2688 EnableMethodHandles = true; 2689 } 2690 if (EnableMethodHandles && !AnonymousClasses) { 2691 if (!FLAG_IS_DEFAULT(AnonymousClasses)) { 2692 warning("forcing AnonymousClasses true because EnableMethodHandles is true"); 2693 } 2694 AnonymousClasses = true; 2695 } 2696 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) { 2697 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 2698 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true"); 2699 } 2700 ScavengeRootsInCode = 1; 2701 } 2702 2703 if (PrintGCDetails) { 2704 // Turn on -verbose:gc options as well 2705 PrintGC = true; 2706 if (FLAG_IS_DEFAULT(TraceClassUnloading)) { 2707 TraceClassUnloading = true; 2708 } 2709 } 2710 2711 #if defined(_LP64) && defined(COMPILER1) 2712 UseCompressedOops = false; 2713 #endif 2714 2715 #ifdef SERIALGC 2716 force_serial_gc(); 2717 #endif // SERIALGC 2718 #ifdef KERNEL 2719 no_shared_spaces(); 2720 #endif // KERNEL 2721 2722 // Set flags based on ergonomics. 2723 set_ergonomics_flags(); 2724 2725 // Check the GC selections again. 2726 if (!check_gc_consistency()) { 2727 return JNI_EINVAL; 2728 } 2729 2730 if (UseConcMarkSweepGC) { 2731 // Set flags for CMS and ParNew. Check UseConcMarkSweep first 2732 // to ensure that when both UseConcMarkSweepGC and UseParNewGC 2733 // are true, we don't call set_parnew_gc_flags() as well. 2734 set_cms_and_parnew_gc_flags(); 2735 } else { 2736 // Set heap size based on available physical memory 2737 set_heap_size(); 2738 // Set per-collector flags 2739 if (UseParallelGC || UseParallelOldGC) { 2740 set_parallel_gc_flags(); 2741 } else if (UseParNewGC) { 2742 set_parnew_gc_flags(); 2743 } else if (UseG1GC) { 2744 set_g1_gc_flags(); 2745 } 2746 } 2747 2748 #ifdef SERIALGC 2749 assert(verify_serial_gc_flags(), "SerialGC unset"); 2750 #endif // SERIALGC 2751 2752 // Set bytecode rewriting flags 2753 set_bytecode_flags(); 2754 2755 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 2756 set_aggressive_opts_flags(); 2757 2758 #ifdef CC_INTERP 2759 // Clear flags not supported by the C++ interpreter 2760 FLAG_SET_DEFAULT(ProfileInterpreter, false); 2761 FLAG_SET_DEFAULT(UseBiasedLocking, false); 2762 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 2763 #endif // CC_INTERP 2764 2765 #ifdef ZERO 2766 // Clear flags not supported by Zero 2767 FLAG_SET_DEFAULT(TaggedStackInterpreter, false); 2768 #endif // ZERO 2769 2770 2771 #ifdef COMPILER2 2772 if (!UseBiasedLocking || EmitSync != 0) { 2773 UseOptoBiasInlining = false; 2774 } 2775 #endif 2776 2777 if (PrintCommandLineFlags) { 2778 CommandLineFlags::printSetFlags(); 2779 } 2780 2781 #ifdef ASSERT 2782 if (PrintFlagsFinal) { 2783 CommandLineFlags::printFlags(); 2784 } 2785 #endif 2786 2787 return JNI_OK; 2788 } 2789 2790 int Arguments::PropertyList_count(SystemProperty* pl) { 2791 int count = 0; 2792 while(pl != NULL) { 2793 count++; 2794 pl = pl->next(); 2795 } 2796 return count; 2797 } 2798 2799 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 2800 assert(key != NULL, "just checking"); 2801 SystemProperty* prop; 2802 for (prop = pl; prop != NULL; prop = prop->next()) { 2803 if (strcmp(key, prop->key()) == 0) return prop->value(); 2804 } 2805 return NULL; 2806 } 2807 2808 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 2809 int count = 0; 2810 const char* ret_val = NULL; 2811 2812 while(pl != NULL) { 2813 if(count >= index) { 2814 ret_val = pl->key(); 2815 break; 2816 } 2817 count++; 2818 pl = pl->next(); 2819 } 2820 2821 return ret_val; 2822 } 2823 2824 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 2825 int count = 0; 2826 char* ret_val = NULL; 2827 2828 while(pl != NULL) { 2829 if(count >= index) { 2830 ret_val = pl->value(); 2831 break; 2832 } 2833 count++; 2834 pl = pl->next(); 2835 } 2836 2837 return ret_val; 2838 } 2839 2840 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 2841 SystemProperty* p = *plist; 2842 if (p == NULL) { 2843 *plist = new_p; 2844 } else { 2845 while (p->next() != NULL) { 2846 p = p->next(); 2847 } 2848 p->set_next(new_p); 2849 } 2850 } 2851 2852 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 2853 if (plist == NULL) 2854 return; 2855 2856 SystemProperty* new_p = new SystemProperty(k, v, true); 2857 PropertyList_add(plist, new_p); 2858 } 2859 2860 // This add maintains unique property key in the list. 2861 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 2862 if (plist == NULL) 2863 return; 2864 2865 // If property key exist then update with new value. 2866 SystemProperty* prop; 2867 for (prop = *plist; prop != NULL; prop = prop->next()) { 2868 if (strcmp(k, prop->key()) == 0) { 2869 if (append) { 2870 prop->append_value(v); 2871 } else { 2872 prop->set_value(v); 2873 } 2874 return; 2875 } 2876 } 2877 2878 PropertyList_add(plist, k, v); 2879 } 2880 2881 #ifdef KERNEL 2882 char *Arguments::get_kernel_properties() { 2883 // Find properties starting with kernel and append them to string 2884 // We need to find out how long they are first because the URL's that they 2885 // might point to could get long. 2886 int length = 0; 2887 SystemProperty* prop; 2888 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 2889 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 2890 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 2891 } 2892 } 2893 // Add one for null terminator. 2894 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 2895 if (length != 0) { 2896 int pos = 0; 2897 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 2898 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 2899 jio_snprintf(&props[pos], length-pos, 2900 "-D%s=%s ", prop->key(), prop->value()); 2901 pos = strlen(props); 2902 } 2903 } 2904 } 2905 // null terminate props in case of null 2906 props[length] = '\0'; 2907 return props; 2908 } 2909 #endif // KERNEL 2910 2911 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 2912 // Returns true if all of the source pointed by src has been copied over to 2913 // the destination buffer pointed by buf. Otherwise, returns false. 2914 // Notes: 2915 // 1. If the length (buflen) of the destination buffer excluding the 2916 // NULL terminator character is not long enough for holding the expanded 2917 // pid characters, it also returns false instead of returning the partially 2918 // expanded one. 2919 // 2. The passed in "buflen" should be large enough to hold the null terminator. 2920 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 2921 char* buf, size_t buflen) { 2922 const char* p = src; 2923 char* b = buf; 2924 const char* src_end = &src[srclen]; 2925 char* buf_end = &buf[buflen - 1]; 2926 2927 while (p < src_end && b < buf_end) { 2928 if (*p == '%') { 2929 switch (*(++p)) { 2930 case '%': // "%%" ==> "%" 2931 *b++ = *p++; 2932 break; 2933 case 'p': { // "%p" ==> current process id 2934 // buf_end points to the character before the last character so 2935 // that we could write '\0' to the end of the buffer. 2936 size_t buf_sz = buf_end - b + 1; 2937 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 2938 2939 // if jio_snprintf fails or the buffer is not long enough to hold 2940 // the expanded pid, returns false. 2941 if (ret < 0 || ret >= (int)buf_sz) { 2942 return false; 2943 } else { 2944 b += ret; 2945 assert(*b == '\0', "fail in copy_expand_pid"); 2946 if (p == src_end && b == buf_end + 1) { 2947 // reach the end of the buffer. 2948 return true; 2949 } 2950 } 2951 p++; 2952 break; 2953 } 2954 default : 2955 *b++ = '%'; 2956 } 2957 } else { 2958 *b++ = *p++; 2959 } 2960 } 2961 *b = '\0'; 2962 return (p == src_end); // return false if not all of the source was copied 2963 }