arguments.cpp revision 1499:e9ff18c4ace7
1/* 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * 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 31char** Arguments::_jvm_flags_array = NULL; 32int Arguments::_num_jvm_flags = 0; 33char** Arguments::_jvm_args_array = NULL; 34int Arguments::_num_jvm_args = 0; 35char* Arguments::_java_command = NULL; 36SystemProperty* Arguments::_system_properties = NULL; 37const char* Arguments::_gc_log_filename = NULL; 38bool Arguments::_has_profile = false; 39bool Arguments::_has_alloc_profile = false; 40uintx Arguments::_min_heap_size = 0; 41Arguments::Mode Arguments::_mode = _mixed; 42bool Arguments::_java_compiler = false; 43bool Arguments::_xdebug_mode = false; 44const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 45const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 46int Arguments::_sun_java_launcher_pid = -1; 47 48// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 49bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 50bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 51bool Arguments::_BackgroundCompilation = BackgroundCompilation; 52bool Arguments::_ClipInlining = ClipInlining; 53intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold; 54 55char* Arguments::SharedArchivePath = NULL; 56 57AgentLibraryList Arguments::_libraryList; 58AgentLibraryList Arguments::_agentList; 59 60abort_hook_t Arguments::_abort_hook = NULL; 61exit_hook_t Arguments::_exit_hook = NULL; 62vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 63 64 65SystemProperty *Arguments::_java_ext_dirs = NULL; 66SystemProperty *Arguments::_java_endorsed_dirs = NULL; 67SystemProperty *Arguments::_sun_boot_library_path = NULL; 68SystemProperty *Arguments::_java_library_path = NULL; 69SystemProperty *Arguments::_java_home = NULL; 70SystemProperty *Arguments::_java_class_path = NULL; 71SystemProperty *Arguments::_sun_boot_class_path = NULL; 72 73char* Arguments::_meta_index_path = NULL; 74char* Arguments::_meta_index_dir = NULL; 75 76static bool force_client_mode = false; 77 78// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 79 80static 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 91static 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. 98void 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. 118void 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 */ 163typedef 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 169static 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. 194bool 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. 227class SysClassPath: public StackObj { 228public: 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 253private: 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 274SysClassPath::SysClassPath(const char* base) { 275 memset(_items, 0, sizeof(_items)); 276 _items[_scp_base] = base; 277 DEBUG_ONLY(_expansion_done = false;) 278} 279 280SysClassPath::~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 288inline void SysClassPath::set_base(const char* base) { 289 _items[_scp_base] = base; 290} 291 292inline void SysClassPath::add_prefix(const char* prefix) { 293 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 294} 295 296inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 297 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 298} 299 300inline void SysClassPath::add_suffix(const char* suffix) { 301 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 302} 303 304inline 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 312inline 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 321void 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. 353char* 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. 388char* 389SysClassPath::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. 423char* 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. 454static 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 493Arguments::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 501void 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 518static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 519 return CommandLineFlags::boolAtPut(name, &value, origin); 520} 521 522static 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 534static 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 567static 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 574static 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 602bool 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 662void 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 681void Arguments::build_jvm_args(const char* arg) { 682 add_string(&_jvm_args_array, &_num_jvm_args, arg); 683} 684 685void 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 691const 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 708void 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 720void 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 729void 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 738bool 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 765bool 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 832const char* Arguments::get_property(const char* key) { 833 return PropertyList_get_value(system_properties(), key); 834} 835 836bool 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 892void 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 941static 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#ifndef KERNEL 952// If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 953// if it's not explictly set or unset. If the user has chosen 954// UseParNewGC and not explicitly set ParallelGCThreads we 955// set it, unless this is a single cpu machine. 956void Arguments::set_parnew_gc_flags() { 957 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 958 "control point invariant"); 959 assert(UseParNewGC, "Error"); 960 961 // Turn off AdaptiveSizePolicy by default for parnew until it is 962 // complete. 963 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 964 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 965 } 966 967 if (ParallelGCThreads == 0) { 968 FLAG_SET_DEFAULT(ParallelGCThreads, 969 Abstract_VM_Version::parallel_worker_threads()); 970 if (ParallelGCThreads == 1) { 971 FLAG_SET_DEFAULT(UseParNewGC, false); 972 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 973 } 974 } 975 if (UseParNewGC) { 976 // CDS doesn't work with ParNew yet 977 no_shared_spaces(); 978 979 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 980 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 981 // we set them to 1024 and 1024. 982 // See CR 6362902. 983 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 984 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 985 } 986 if (FLAG_IS_DEFAULT(OldPLABSize)) { 987 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 988 } 989 990 // AlwaysTenure flag should make ParNew promote all at first collection. 991 // See CR 6362902. 992 if (AlwaysTenure) { 993 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 994 } 995 // When using compressed oops, we use local overflow stacks, 996 // rather than using a global overflow list chained through 997 // the klass word of the object's pre-image. 998 if (UseCompressedOops && !ParGCUseLocalOverflow) { 999 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1000 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1001 } 1002 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1003 } 1004 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1005 } 1006} 1007 1008// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1009// sparc/solaris for certain applications, but would gain from 1010// further optimization and tuning efforts, and would almost 1011// certainly gain from analysis of platform and environment. 1012void Arguments::set_cms_and_parnew_gc_flags() { 1013 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1014 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1015 1016 // If we are using CMS, we prefer to UseParNewGC, 1017 // unless explicitly forbidden. 1018 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1019 FLAG_SET_ERGO(bool, UseParNewGC, true); 1020 } 1021 1022 // Turn off AdaptiveSizePolicy by default for cms until it is 1023 // complete. 1024 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1025 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1026 } 1027 1028 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1029 // as needed. 1030 if (UseParNewGC) { 1031 set_parnew_gc_flags(); 1032 } 1033 1034 // Now make adjustments for CMS 1035 size_t young_gen_per_worker; 1036 intx new_ratio; 1037 size_t min_new_default; 1038 intx tenuring_default; 1039 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0 1040 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) { 1041 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M); 1042 } 1043 young_gen_per_worker = 4*M; 1044 new_ratio = (intx)15; 1045 min_new_default = 4*M; 1046 tenuring_default = (intx)0; 1047 } else { // new defaults: "new" as of 6.0 1048 young_gen_per_worker = CMSYoungGenPerWorker; 1049 new_ratio = (intx)7; 1050 min_new_default = 16*M; 1051 tenuring_default = (intx)4; 1052 } 1053 1054 // Preferred young gen size for "short" pauses 1055 const uintx parallel_gc_threads = 1056 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1057 const size_t preferred_max_new_size_unaligned = 1058 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads); 1059 const size_t preferred_max_new_size = 1060 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1061 1062 // Unless explicitly requested otherwise, size young gen 1063 // for "short" pauses ~ 4M*ParallelGCThreads 1064 1065 // If either MaxNewSize or NewRatio is set on the command line, 1066 // assume the user is trying to set the size of the young gen. 1067 1068 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1069 1070 // Set MaxNewSize to our calculated preferred_max_new_size unless 1071 // NewSize was set on the command line and it is larger than 1072 // preferred_max_new_size. 1073 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1074 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1075 } else { 1076 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1077 } 1078 if (PrintGCDetails && Verbose) { 1079 // Too early to use gclog_or_tty 1080 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1081 } 1082 1083 // Unless explicitly requested otherwise, prefer a large 1084 // Old to Young gen size so as to shift the collection load 1085 // to the old generation concurrent collector 1086 1087 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio) 1088 // then NewSize and OldSize may be calculated. That would 1089 // generally lead to some differences with ParNewGC for which 1090 // there was no obvious reason. Also limit to the case where 1091 // MaxNewSize has not been set. 1092 1093 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio)); 1094 1095 // Code along this path potentially sets NewSize and OldSize 1096 1097 // Calculate the desired minimum size of the young gen but if 1098 // NewSize has been set on the command line, use it here since 1099 // it should be the final value. 1100 size_t min_new; 1101 if (FLAG_IS_DEFAULT(NewSize)) { 1102 min_new = align_size_up(ScaleForWordSize(min_new_default), 1103 os::vm_page_size()); 1104 } else { 1105 min_new = NewSize; 1106 } 1107 size_t prev_initial_size = InitialHeapSize; 1108 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) { 1109 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize); 1110 // Currently minimum size and the initial heap sizes are the same. 1111 set_min_heap_size(InitialHeapSize); 1112 if (PrintGCDetails && Verbose) { 1113 warning("Initial heap size increased to " SIZE_FORMAT " M from " 1114 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.", 1115 InitialHeapSize/M, prev_initial_size/M); 1116 } 1117 } 1118 1119 // MaxHeapSize is aligned down in collectorPolicy 1120 size_t max_heap = 1121 align_size_down(MaxHeapSize, 1122 CardTableRS::ct_max_alignment_constraint()); 1123 1124 if (PrintGCDetails && Verbose) { 1125 // Too early to use gclog_or_tty 1126 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1127 " initial_heap_size: " SIZE_FORMAT 1128 " max_heap: " SIZE_FORMAT, 1129 min_heap_size(), InitialHeapSize, max_heap); 1130 } 1131 if (max_heap > min_new) { 1132 // Unless explicitly requested otherwise, make young gen 1133 // at least min_new, and at most preferred_max_new_size. 1134 if (FLAG_IS_DEFAULT(NewSize)) { 1135 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1136 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1137 if (PrintGCDetails && Verbose) { 1138 // Too early to use gclog_or_tty 1139 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize); 1140 } 1141 } 1142 // Unless explicitly requested otherwise, size old gen 1143 // so that it's at least 3X of NewSize to begin with; 1144 // later NewRatio will decide how it grows; see above. 1145 if (FLAG_IS_DEFAULT(OldSize)) { 1146 if (max_heap > NewSize) { 1147 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize)); 1148 if (PrintGCDetails && Verbose) { 1149 // Too early to use gclog_or_tty 1150 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize); 1151 } 1152 } 1153 } 1154 } 1155 } 1156 // Unless explicitly requested otherwise, definitely 1157 // promote all objects surviving "tenuring_default" scavenges. 1158 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1159 FLAG_IS_DEFAULT(SurvivorRatio)) { 1160 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1161 } 1162 // If we decided above (or user explicitly requested) 1163 // `promote all' (via MaxTenuringThreshold := 0), 1164 // prefer minuscule survivor spaces so as not to waste 1165 // space for (non-existent) survivors 1166 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1167 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1168 } 1169 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1170 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1171 // This is done in order to make ParNew+CMS configuration to work 1172 // with YoungPLABSize and OldPLABSize options. 1173 // See CR 6362902. 1174 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1175 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1176 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1177 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1178 // the value (either from the command line or ergonomics) of 1179 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1180 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 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 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1192 // OldPLAB sizing manually turned off: Use a larger default setting, 1193 // unless it was manually specified. This is because a too-low value 1194 // will slow down scavenges. 1195 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1196 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1197 } 1198 } 1199 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1200 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1201 // If either of the static initialization defaults have changed, note this 1202 // modification. 1203 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1204 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1205 } 1206 if (PrintGCDetails && Verbose) { 1207 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1208 MarkStackSize / K, MarkStackSizeMax / K); 1209 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1210 } 1211} 1212#endif // KERNEL 1213 1214void set_object_alignment() { 1215 // Object alignment. 1216 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1217 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1218 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1219 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1220 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1221 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1222 1223 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1224 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1225 1226 // Oop encoding heap max 1227 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1228 1229#ifndef KERNEL 1230 // Set CMS global values 1231 CompactibleFreeListSpace::set_cms_values(); 1232#endif // KERNEL 1233} 1234 1235bool verify_object_alignment() { 1236 // Object alignment. 1237 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1238 jio_fprintf(defaultStream::error_stream(), 1239 "error: ObjectAlignmentInBytes=%d must be power of 2", (int)ObjectAlignmentInBytes); 1240 return false; 1241 } 1242 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1243 jio_fprintf(defaultStream::error_stream(), 1244 "error: ObjectAlignmentInBytes=%d must be greater or equal %d", (int)ObjectAlignmentInBytes, BytesPerLong); 1245 return false; 1246 } 1247 return true; 1248} 1249 1250inline uintx max_heap_for_compressed_oops() { 1251 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1252 NOT_LP64(ShouldNotReachHere(); return 0); 1253} 1254 1255bool Arguments::should_auto_select_low_pause_collector() { 1256 if (UseAutoGCSelectPolicy && 1257 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1258 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1259 if (PrintGCDetails) { 1260 // Cannot use gclog_or_tty yet. 1261 tty->print_cr("Automatic selection of the low pause collector" 1262 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1263 } 1264 return true; 1265 } 1266 return false; 1267} 1268 1269void Arguments::set_ergonomics_flags() { 1270 // Parallel GC is not compatible with sharing. If one specifies 1271 // that they want sharing explicitly, do not set ergonomics flags. 1272 if (DumpSharedSpaces || ForceSharedSpaces) { 1273 return; 1274 } 1275 1276 if (os::is_server_class_machine() && !force_client_mode ) { 1277 // If no other collector is requested explicitly, 1278 // let the VM select the collector based on 1279 // machine class and automatic selection policy. 1280 if (!UseSerialGC && 1281 !UseConcMarkSweepGC && 1282 !UseG1GC && 1283 !UseParNewGC && 1284 !DumpSharedSpaces && 1285 FLAG_IS_DEFAULT(UseParallelGC)) { 1286 if (should_auto_select_low_pause_collector()) { 1287 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1288 } else { 1289 FLAG_SET_ERGO(bool, UseParallelGC, true); 1290 } 1291 no_shared_spaces(); 1292 } 1293 } 1294 1295#ifndef ZERO 1296#ifdef _LP64 1297 // Check that UseCompressedOops can be set with the max heap size allocated 1298 // by ergonomics. 1299 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1300#ifndef COMPILER1 1301 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) { 1302 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1303 } 1304#endif 1305#ifdef _WIN64 1306 if (UseLargePages && UseCompressedOops) { 1307 // Cannot allocate guard pages for implicit checks in indexed addressing 1308 // mode, when large pages are specified on windows. 1309 // This flag could be switched ON if narrow oop base address is set to 0, 1310 // see code in Universe::initialize_heap(). 1311 Universe::set_narrow_oop_use_implicit_null_checks(false); 1312 } 1313#endif // _WIN64 1314 } else { 1315 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1316 warning("Max heap size too large for Compressed Oops"); 1317 FLAG_SET_DEFAULT(UseCompressedOops, false); 1318 } 1319 } 1320 // Also checks that certain machines are slower with compressed oops 1321 // in vm_version initialization code. 1322#endif // _LP64 1323#endif // !ZERO 1324} 1325 1326void Arguments::set_parallel_gc_flags() { 1327 assert(UseParallelGC || UseParallelOldGC, "Error"); 1328 // If parallel old was requested, automatically enable parallel scavenge. 1329 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) { 1330 FLAG_SET_DEFAULT(UseParallelGC, true); 1331 } 1332 1333 // If no heap maximum was requested explicitly, use some reasonable fraction 1334 // of the physical memory, up to a maximum of 1GB. 1335 if (UseParallelGC) { 1336 FLAG_SET_ERGO(uintx, ParallelGCThreads, 1337 Abstract_VM_Version::parallel_worker_threads()); 1338 1339 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1340 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1341 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1342 // See CR 6362902 for details. 1343 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1344 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1345 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1346 } 1347 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1348 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1349 } 1350 } 1351 1352 if (UseParallelOldGC) { 1353 // Par compact uses lower default values since they are treated as 1354 // minimums. These are different defaults because of the different 1355 // interpretation and are not ergonomically set. 1356 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1357 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1358 } 1359 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1360 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1361 } 1362 } 1363 } 1364} 1365 1366void Arguments::set_g1_gc_flags() { 1367 assert(UseG1GC, "Error"); 1368#ifdef COMPILER1 1369 FastTLABRefill = false; 1370#endif 1371 FLAG_SET_DEFAULT(ParallelGCThreads, 1372 Abstract_VM_Version::parallel_worker_threads()); 1373 if (ParallelGCThreads == 0) { 1374 FLAG_SET_DEFAULT(ParallelGCThreads, 1375 Abstract_VM_Version::parallel_worker_threads()); 1376 } 1377 no_shared_spaces(); 1378 1379 // Set the maximum pause time goal to be a reasonable default. 1380 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1381 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1382 } 1383 1384 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1385 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1386 } 1387 if (PrintGCDetails && Verbose) { 1388 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1389 MarkStackSize / K, MarkStackSizeMax / K); 1390 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1391 } 1392 1393 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1394 // In G1, we want the default GC overhead goal to be higher than 1395 // say in PS. So we set it here to 10%. Otherwise the heap might 1396 // be expanded more aggressively than we would like it to. In 1397 // fact, even 10% seems to not be high enough in some cases 1398 // (especially small GC stress tests that the main thing they do 1399 // is allocation). We might consider increase it further. 1400 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1401 } 1402} 1403 1404void Arguments::set_heap_size() { 1405 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1406 // Deprecated flag 1407 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1408 } 1409 1410 const julong phys_mem = 1411 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1412 : (julong)MaxRAM; 1413 1414 // If the maximum heap size has not been set with -Xmx, 1415 // then set it as fraction of the size of physical memory, 1416 // respecting the maximum and minimum sizes of the heap. 1417 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1418 julong reasonable_max = phys_mem / MaxRAMFraction; 1419 1420 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1421 // Small physical memory, so use a minimum fraction of it for the heap 1422 reasonable_max = phys_mem / MinRAMFraction; 1423 } else { 1424 // Not-small physical memory, so require a heap at least 1425 // as large as MaxHeapSize 1426 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1427 } 1428 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1429 // Limit the heap size to ErgoHeapSizeLimit 1430 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1431 } 1432 if (UseCompressedOops) { 1433 // Limit the heap size to the maximum possible when using compressed oops 1434 reasonable_max = MIN2(reasonable_max, (julong)max_heap_for_compressed_oops()); 1435 } 1436 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1437 1438 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1439 // An initial heap size was specified on the command line, 1440 // so be sure that the maximum size is consistent. Done 1441 // after call to allocatable_physical_memory because that 1442 // method might reduce the allocation size. 1443 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1444 } 1445 1446 if (PrintGCDetails && Verbose) { 1447 // Cannot use gclog_or_tty yet. 1448 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1449 } 1450 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1451 } 1452 1453 // If the initial_heap_size has not been set with InitialHeapSize 1454 // or -Xms, then set it as fraction of the size of physical memory, 1455 // respecting the maximum and minimum sizes of the heap. 1456 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1457 julong reasonable_minimum = (julong)(OldSize + NewSize); 1458 1459 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1460 1461 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1462 1463 julong reasonable_initial = phys_mem / InitialRAMFraction; 1464 1465 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1466 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1467 1468 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1469 1470 if (PrintGCDetails && Verbose) { 1471 // Cannot use gclog_or_tty yet. 1472 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1473 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1474 } 1475 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1476 set_min_heap_size((uintx)reasonable_minimum); 1477 } 1478} 1479 1480// This must be called after ergonomics because we want bytecode rewriting 1481// if the server compiler is used, or if UseSharedSpaces is disabled. 1482void Arguments::set_bytecode_flags() { 1483 // Better not attempt to store into a read-only space. 1484 if (UseSharedSpaces) { 1485 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1486 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1487 } 1488 1489 if (!RewriteBytecodes) { 1490 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1491 } 1492} 1493 1494// Aggressive optimization flags -XX:+AggressiveOpts 1495void Arguments::set_aggressive_opts_flags() { 1496#ifdef COMPILER2 1497 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1498 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1499 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1500 } 1501 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1502 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1503 } 1504 1505 // Feed the cache size setting into the JDK 1506 char buffer[1024]; 1507 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1508 add_property(buffer); 1509 } 1510 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1511 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1512 } 1513 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1514 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1515 } 1516#endif 1517 1518 if (AggressiveOpts) { 1519// Sample flag setting code 1520// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1521// FLAG_SET_DEFAULT(EliminateZeroing, true); 1522// } 1523 } 1524} 1525 1526//=========================================================================================================== 1527// Parsing of java.compiler property 1528 1529void Arguments::process_java_compiler_argument(char* arg) { 1530 // For backwards compatibility, Djava.compiler=NONE or "" 1531 // causes us to switch to -Xint mode UNLESS -Xdebug 1532 // is also specified. 1533 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1534 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1535 } 1536} 1537 1538void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1539 _sun_java_launcher = strdup(launcher); 1540} 1541 1542bool Arguments::created_by_java_launcher() { 1543 assert(_sun_java_launcher != NULL, "property must have value"); 1544 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1545} 1546 1547//=========================================================================================================== 1548// Parsing of main arguments 1549 1550bool Arguments::verify_interval(uintx val, uintx min, 1551 uintx max, const char* name) { 1552 // Returns true iff value is in the inclusive interval [min..max] 1553 // false, otherwise. 1554 if (val >= min && val <= max) { 1555 return true; 1556 } 1557 jio_fprintf(defaultStream::error_stream(), 1558 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1559 " and " UINTX_FORMAT "\n", 1560 name, val, min, max); 1561 return false; 1562} 1563 1564bool Arguments::verify_percentage(uintx value, const char* name) { 1565 if (value <= 100) { 1566 return true; 1567 } 1568 jio_fprintf(defaultStream::error_stream(), 1569 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1570 name, value); 1571 return false; 1572} 1573 1574static void force_serial_gc() { 1575 FLAG_SET_DEFAULT(UseSerialGC, true); 1576 FLAG_SET_DEFAULT(UseParNewGC, false); 1577 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1578 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1579 FLAG_SET_DEFAULT(UseParallelGC, false); 1580 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1581 FLAG_SET_DEFAULT(UseG1GC, false); 1582} 1583 1584static bool verify_serial_gc_flags() { 1585 return (UseSerialGC && 1586 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1587 UseParallelGC || UseParallelOldGC)); 1588} 1589 1590// Check consistency of GC selection 1591bool Arguments::check_gc_consistency() { 1592 bool status = true; 1593 // Ensure that the user has not selected conflicting sets 1594 // of collectors. [Note: this check is merely a user convenience; 1595 // collectors over-ride each other so that only a non-conflicting 1596 // set is selected; however what the user gets is not what they 1597 // may have expected from the combination they asked for. It's 1598 // better to reduce user confusion by not allowing them to 1599 // select conflicting combinations. 1600 uint i = 0; 1601 if (UseSerialGC) i++; 1602 if (UseConcMarkSweepGC || UseParNewGC) i++; 1603 if (UseParallelGC || UseParallelOldGC) i++; 1604 if (UseG1GC) i++; 1605 if (i > 1) { 1606 jio_fprintf(defaultStream::error_stream(), 1607 "Conflicting collector combinations in option list; " 1608 "please refer to the release notes for the combinations " 1609 "allowed\n"); 1610 status = false; 1611 } 1612 1613 return status; 1614} 1615 1616// Check the consistency of vm_init_args 1617bool Arguments::check_vm_args_consistency() { 1618 // Method for adding checks for flag consistency. 1619 // The intent is to warn the user of all possible conflicts, 1620 // before returning an error. 1621 // Note: Needs platform-dependent factoring. 1622 bool status = true; 1623 1624#if ( (defined(COMPILER2) && defined(SPARC))) 1625 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1626 // on sparc doesn't require generation of a stub as is the case on, e.g., 1627 // x86. Normally, VM_Version_init must be called from init_globals in 1628 // init.cpp, which is called by the initial java thread *after* arguments 1629 // have been parsed. VM_Version_init gets called twice on sparc. 1630 extern void VM_Version_init(); 1631 VM_Version_init(); 1632 if (!VM_Version::has_v9()) { 1633 jio_fprintf(defaultStream::error_stream(), 1634 "V8 Machine detected, Server requires V9\n"); 1635 status = false; 1636 } 1637#endif /* COMPILER2 && SPARC */ 1638 1639 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1640 // builds so the cost of stack banging can be measured. 1641#if (defined(PRODUCT) && defined(SOLARIS)) 1642 if (!UseBoundThreads && !UseStackBanging) { 1643 jio_fprintf(defaultStream::error_stream(), 1644 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1645 1646 status = false; 1647 } 1648#endif 1649 1650 if (TLABRefillWasteFraction == 0) { 1651 jio_fprintf(defaultStream::error_stream(), 1652 "TLABRefillWasteFraction should be a denominator, " 1653 "not " SIZE_FORMAT "\n", 1654 TLABRefillWasteFraction); 1655 status = false; 1656 } 1657 1658 status = status && verify_percentage(MaxLiveObjectEvacuationRatio, 1659 "MaxLiveObjectEvacuationRatio"); 1660 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1661 "AdaptiveSizePolicyWeight"); 1662 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1663 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1664 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1665 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1666 1667 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1668 jio_fprintf(defaultStream::error_stream(), 1669 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1670 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1671 MinHeapFreeRatio, MaxHeapFreeRatio); 1672 status = false; 1673 } 1674 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1675 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1676 1677 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1678 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1679 } 1680 1681 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1682 // Settings to encourage splitting. 1683 if (!FLAG_IS_CMDLINE(NewRatio)) { 1684 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1685 } 1686 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1687 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1688 } 1689 } 1690 1691 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1692 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1693 if (GCTimeLimit == 100) { 1694 // Turn off gc-overhead-limit-exceeded checks 1695 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1696 } 1697 1698 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1699 1700 // Check user specified sharing option conflict with Parallel GC 1701 bool cannot_share = ((UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || UseParNewGC || 1702 UseParallelGC || UseParallelOldGC || 1703 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages)); 1704 1705 if (cannot_share) { 1706 // Either force sharing on by forcing the other options off, or 1707 // force sharing off. 1708 if (DumpSharedSpaces || ForceSharedSpaces) { 1709 jio_fprintf(defaultStream::error_stream(), 1710 "Reverting to Serial GC because of %s\n", 1711 ForceSharedSpaces ? " -Xshare:on" : "-Xshare:dump"); 1712 force_serial_gc(); 1713 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false); 1714 } else { 1715 if (UseSharedSpaces && Verbose) { 1716 jio_fprintf(defaultStream::error_stream(), 1717 "Turning off use of shared archive because of " 1718 "choice of garbage collector or large pages\n"); 1719 } 1720 no_shared_spaces(); 1721 } 1722 } 1723 1724 status = status && check_gc_consistency(); 1725 1726 if (_has_alloc_profile) { 1727 if (UseParallelGC || UseParallelOldGC) { 1728 jio_fprintf(defaultStream::error_stream(), 1729 "error: invalid argument combination.\n" 1730 "Allocation profiling (-Xaprof) cannot be used together with " 1731 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1732 status = false; 1733 } 1734 if (UseConcMarkSweepGC) { 1735 jio_fprintf(defaultStream::error_stream(), 1736 "error: invalid argument combination.\n" 1737 "Allocation profiling (-Xaprof) cannot be used together with " 1738 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1739 status = false; 1740 } 1741 } 1742 1743 if (CMSIncrementalMode) { 1744 if (!UseConcMarkSweepGC) { 1745 jio_fprintf(defaultStream::error_stream(), 1746 "error: invalid argument combination.\n" 1747 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1748 "selected in order\nto use CMSIncrementalMode.\n"); 1749 status = false; 1750 } else { 1751 status = status && verify_percentage(CMSIncrementalDutyCycle, 1752 "CMSIncrementalDutyCycle"); 1753 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1754 "CMSIncrementalDutyCycleMin"); 1755 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1756 "CMSIncrementalSafetyFactor"); 1757 status = status && verify_percentage(CMSIncrementalOffset, 1758 "CMSIncrementalOffset"); 1759 status = status && verify_percentage(CMSExpAvgFactor, 1760 "CMSExpAvgFactor"); 1761 // If it was not set on the command line, set 1762 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1763 if (CMSInitiatingOccupancyFraction < 0) { 1764 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1765 } 1766 } 1767 } 1768 1769 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1770 // insists that we hold the requisite locks so that the iteration is 1771 // MT-safe. For the verification at start-up and shut-down, we don't 1772 // yet have a good way of acquiring and releasing these locks, 1773 // which are not visible at the CollectedHeap level. We want to 1774 // be able to acquire these locks and then do the iteration rather 1775 // than just disable the lock verification. This will be fixed under 1776 // bug 4788986. 1777 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1778 if (VerifyGCStartAt == 0) { 1779 warning("Heap verification at start-up disabled " 1780 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1781 VerifyGCStartAt = 1; // Disable verification at start-up 1782 } 1783 if (VerifyBeforeExit) { 1784 warning("Heap verification at shutdown disabled " 1785 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1786 VerifyBeforeExit = false; // Disable verification at shutdown 1787 } 1788 } 1789 1790 // Note: only executed in non-PRODUCT mode 1791 if (!UseAsyncConcMarkSweepGC && 1792 (ExplicitGCInvokesConcurrent || 1793 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1794 jio_fprintf(defaultStream::error_stream(), 1795 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1796 " with -UseAsyncConcMarkSweepGC"); 1797 status = false; 1798 } 1799 1800 if (UseG1GC) { 1801 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1802 "InitiatingHeapOccupancyPercent"); 1803 } 1804 1805 status = status && verify_interval(RefDiscoveryPolicy, 1806 ReferenceProcessor::DiscoveryPolicyMin, 1807 ReferenceProcessor::DiscoveryPolicyMax, 1808 "RefDiscoveryPolicy"); 1809 1810 // Limit the lower bound of this flag to 1 as it is used in a division 1811 // expression. 1812 status = status && verify_interval(TLABWasteTargetPercent, 1813 1, 100, "TLABWasteTargetPercent"); 1814 1815 status = status && verify_object_alignment(); 1816 1817 return status; 1818} 1819 1820bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1821 const char* option_type) { 1822 if (ignore) return false; 1823 1824 const char* spacer = " "; 1825 if (option_type == NULL) { 1826 option_type = ++spacer; // Set both to the empty string. 1827 } 1828 1829 if (os::obsolete_option(option)) { 1830 jio_fprintf(defaultStream::error_stream(), 1831 "Obsolete %s%soption: %s\n", option_type, spacer, 1832 option->optionString); 1833 return false; 1834 } else { 1835 jio_fprintf(defaultStream::error_stream(), 1836 "Unrecognized %s%soption: %s\n", option_type, spacer, 1837 option->optionString); 1838 return true; 1839 } 1840} 1841 1842static const char* user_assertion_options[] = { 1843 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1844}; 1845 1846static const char* system_assertion_options[] = { 1847 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1848}; 1849 1850// Return true if any of the strings in null-terminated array 'names' matches. 1851// If tail_allowed is true, then the tail must begin with a colon; otherwise, 1852// the option must match exactly. 1853static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 1854 bool tail_allowed) { 1855 for (/* empty */; *names != NULL; ++names) { 1856 if (match_option(option, *names, tail)) { 1857 if (**tail == '\0' || tail_allowed && **tail == ':') { 1858 return true; 1859 } 1860 } 1861 } 1862 return false; 1863} 1864 1865bool Arguments::parse_uintx(const char* value, 1866 uintx* uintx_arg, 1867 uintx min_size) { 1868 1869 // Check the sign first since atomull() parses only unsigned values. 1870 bool value_is_positive = !(*value == '-'); 1871 1872 if (value_is_positive) { 1873 julong n; 1874 bool good_return = atomull(value, &n); 1875 if (good_return) { 1876 bool above_minimum = n >= min_size; 1877 bool value_is_too_large = n > max_uintx; 1878 1879 if (above_minimum && !value_is_too_large) { 1880 *uintx_arg = n; 1881 return true; 1882 } 1883 } 1884 } 1885 return false; 1886} 1887 1888Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1889 julong* long_arg, 1890 julong min_size) { 1891 if (!atomull(s, long_arg)) return arg_unreadable; 1892 return check_memory_size(*long_arg, min_size); 1893} 1894 1895// Parse JavaVMInitArgs structure 1896 1897jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 1898 // For components of the system classpath. 1899 SysClassPath scp(Arguments::get_sysclasspath()); 1900 bool scp_assembly_required = false; 1901 1902 // Save default settings for some mode flags 1903 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1904 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1905 Arguments::_ClipInlining = ClipInlining; 1906 Arguments::_BackgroundCompilation = BackgroundCompilation; 1907 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold; 1908 1909 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 1910 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 1911 if (result != JNI_OK) { 1912 return result; 1913 } 1914 1915 // Parse JavaVMInitArgs structure passed in 1916 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 1917 if (result != JNI_OK) { 1918 return result; 1919 } 1920 1921 if (AggressiveOpts) { 1922 // Insert alt-rt.jar between user-specified bootclasspath 1923 // prefix and the default bootclasspath. os::set_boot_path() 1924 // uses meta_index_dir as the default bootclasspath directory. 1925 const char* altclasses_jar = "alt-rt.jar"; 1926 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 1927 strlen(altclasses_jar); 1928 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 1929 strcpy(altclasses_path, get_meta_index_dir()); 1930 strcat(altclasses_path, altclasses_jar); 1931 scp.add_suffix_to_prefix(altclasses_path); 1932 scp_assembly_required = true; 1933 FREE_C_HEAP_ARRAY(char, altclasses_path); 1934 } 1935 1936 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 1937 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 1938 if (result != JNI_OK) { 1939 return result; 1940 } 1941 1942 // Do final processing now that all arguments have been parsed 1943 result = finalize_vm_init_args(&scp, scp_assembly_required); 1944 if (result != JNI_OK) { 1945 return result; 1946 } 1947 1948 return JNI_OK; 1949} 1950 1951jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 1952 SysClassPath* scp_p, 1953 bool* scp_assembly_required_p, 1954 FlagValueOrigin origin) { 1955 // Remaining part of option string 1956 const char* tail; 1957 1958 // iterate over arguments 1959 for (int index = 0; index < args->nOptions; index++) { 1960 bool is_absolute_path = false; // for -agentpath vs -agentlib 1961 1962 const JavaVMOption* option = args->options + index; 1963 1964 if (!match_option(option, "-Djava.class.path", &tail) && 1965 !match_option(option, "-Dsun.java.command", &tail) && 1966 !match_option(option, "-Dsun.java.launcher", &tail)) { 1967 1968 // add all jvm options to the jvm_args string. This string 1969 // is used later to set the java.vm.args PerfData string constant. 1970 // the -Djava.class.path and the -Dsun.java.command options are 1971 // omitted from jvm_args string as each have their own PerfData 1972 // string constant object. 1973 build_jvm_args(option->optionString); 1974 } 1975 1976 // -verbose:[class/gc/jni] 1977 if (match_option(option, "-verbose", &tail)) { 1978 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 1979 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 1980 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 1981 } else if (!strcmp(tail, ":gc")) { 1982 FLAG_SET_CMDLINE(bool, PrintGC, true); 1983 } else if (!strcmp(tail, ":jni")) { 1984 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 1985 } 1986 // -da / -ea / -disableassertions / -enableassertions 1987 // These accept an optional class/package name separated by a colon, e.g., 1988 // -da:java.lang.Thread. 1989 } else if (match_option(option, user_assertion_options, &tail, true)) { 1990 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 1991 if (*tail == '\0') { 1992 JavaAssertions::setUserClassDefault(enable); 1993 } else { 1994 assert(*tail == ':', "bogus match by match_option()"); 1995 JavaAssertions::addOption(tail + 1, enable); 1996 } 1997 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 1998 } else if (match_option(option, system_assertion_options, &tail, false)) { 1999 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2000 JavaAssertions::setSystemClassDefault(enable); 2001 // -bootclasspath: 2002 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2003 scp_p->reset_path(tail); 2004 *scp_assembly_required_p = true; 2005 // -bootclasspath/a: 2006 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2007 scp_p->add_suffix(tail); 2008 *scp_assembly_required_p = true; 2009 // -bootclasspath/p: 2010 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2011 scp_p->add_prefix(tail); 2012 *scp_assembly_required_p = true; 2013 // -Xrun 2014 } else if (match_option(option, "-Xrun", &tail)) { 2015 if (tail != NULL) { 2016 const char* pos = strchr(tail, ':'); 2017 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2018 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2019 name[len] = '\0'; 2020 2021 char *options = NULL; 2022 if(pos != NULL) { 2023 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2024 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 2025 } 2026#ifdef JVMTI_KERNEL 2027 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2028 warning("profiling and debugging agents are not supported with Kernel VM"); 2029 } else 2030#endif // JVMTI_KERNEL 2031 add_init_library(name, options); 2032 } 2033 // -agentlib and -agentpath 2034 } else if (match_option(option, "-agentlib:", &tail) || 2035 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2036 if(tail != NULL) { 2037 const char* pos = strchr(tail, '='); 2038 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2039 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2040 name[len] = '\0'; 2041 2042 char *options = NULL; 2043 if(pos != NULL) { 2044 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 2045 } 2046#ifdef JVMTI_KERNEL 2047 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2048 warning("profiling and debugging agents are not supported with Kernel VM"); 2049 } else 2050#endif // JVMTI_KERNEL 2051 add_init_agent(name, options, is_absolute_path); 2052 2053 } 2054 // -javaagent 2055 } else if (match_option(option, "-javaagent:", &tail)) { 2056 if(tail != NULL) { 2057 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 2058 add_init_agent("instrument", options, false); 2059 } 2060 // -Xnoclassgc 2061 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2062 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2063 // -Xincgc: i-CMS 2064 } else if (match_option(option, "-Xincgc", &tail)) { 2065 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2066 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2067 // -Xnoincgc: no i-CMS 2068 } else if (match_option(option, "-Xnoincgc", &tail)) { 2069 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2070 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2071 // -Xconcgc 2072 } else if (match_option(option, "-Xconcgc", &tail)) { 2073 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2074 // -Xnoconcgc 2075 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2076 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2077 // -Xbatch 2078 } else if (match_option(option, "-Xbatch", &tail)) { 2079 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2080 // -Xmn for compatibility with other JVM vendors 2081 } else if (match_option(option, "-Xmn", &tail)) { 2082 julong long_initial_eden_size = 0; 2083 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2084 if (errcode != arg_in_range) { 2085 jio_fprintf(defaultStream::error_stream(), 2086 "Invalid initial eden size: %s\n", option->optionString); 2087 describe_range_error(errcode); 2088 return JNI_EINVAL; 2089 } 2090 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2091 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2092 // -Xms 2093 } else if (match_option(option, "-Xms", &tail)) { 2094 julong long_initial_heap_size = 0; 2095 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2096 if (errcode != arg_in_range) { 2097 jio_fprintf(defaultStream::error_stream(), 2098 "Invalid initial heap size: %s\n", option->optionString); 2099 describe_range_error(errcode); 2100 return JNI_EINVAL; 2101 } 2102 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2103 // Currently the minimum size and the initial heap sizes are the same. 2104 set_min_heap_size(InitialHeapSize); 2105 // -Xmx 2106 } else if (match_option(option, "-Xmx", &tail)) { 2107 julong long_max_heap_size = 0; 2108 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2109 if (errcode != arg_in_range) { 2110 jio_fprintf(defaultStream::error_stream(), 2111 "Invalid maximum heap size: %s\n", option->optionString); 2112 describe_range_error(errcode); 2113 return JNI_EINVAL; 2114 } 2115 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2116 // Xmaxf 2117 } else if (match_option(option, "-Xmaxf", &tail)) { 2118 int maxf = (int)(atof(tail) * 100); 2119 if (maxf < 0 || maxf > 100) { 2120 jio_fprintf(defaultStream::error_stream(), 2121 "Bad max heap free percentage size: %s\n", 2122 option->optionString); 2123 return JNI_EINVAL; 2124 } else { 2125 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2126 } 2127 // Xminf 2128 } else if (match_option(option, "-Xminf", &tail)) { 2129 int minf = (int)(atof(tail) * 100); 2130 if (minf < 0 || minf > 100) { 2131 jio_fprintf(defaultStream::error_stream(), 2132 "Bad min heap free percentage size: %s\n", 2133 option->optionString); 2134 return JNI_EINVAL; 2135 } else { 2136 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2137 } 2138 // -Xss 2139 } else if (match_option(option, "-Xss", &tail)) { 2140 julong long_ThreadStackSize = 0; 2141 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2142 if (errcode != arg_in_range) { 2143 jio_fprintf(defaultStream::error_stream(), 2144 "Invalid thread stack size: %s\n", option->optionString); 2145 describe_range_error(errcode); 2146 return JNI_EINVAL; 2147 } 2148 // Internally track ThreadStackSize in units of 1024 bytes. 2149 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2150 round_to((int)long_ThreadStackSize, K) / K); 2151 // -Xoss 2152 } else if (match_option(option, "-Xoss", &tail)) { 2153 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2154 // -Xmaxjitcodesize 2155 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) { 2156 julong long_ReservedCodeCacheSize = 0; 2157 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2158 (size_t)InitialCodeCacheSize); 2159 if (errcode != arg_in_range) { 2160 jio_fprintf(defaultStream::error_stream(), 2161 "Invalid maximum code cache size: %s\n", 2162 option->optionString); 2163 describe_range_error(errcode); 2164 return JNI_EINVAL; 2165 } 2166 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2167 // -green 2168 } else if (match_option(option, "-green", &tail)) { 2169 jio_fprintf(defaultStream::error_stream(), 2170 "Green threads support not available\n"); 2171 return JNI_EINVAL; 2172 // -native 2173 } else if (match_option(option, "-native", &tail)) { 2174 // HotSpot always uses native threads, ignore silently for compatibility 2175 // -Xsqnopause 2176 } else if (match_option(option, "-Xsqnopause", &tail)) { 2177 // EVM option, ignore silently for compatibility 2178 // -Xrs 2179 } else if (match_option(option, "-Xrs", &tail)) { 2180 // Classic/EVM option, new functionality 2181 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2182 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2183 // change default internal VM signals used - lower case for back compat 2184 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2185 // -Xoptimize 2186 } else if (match_option(option, "-Xoptimize", &tail)) { 2187 // EVM option, ignore silently for compatibility 2188 // -Xprof 2189 } else if (match_option(option, "-Xprof", &tail)) { 2190#ifndef FPROF_KERNEL 2191 _has_profile = true; 2192#else // FPROF_KERNEL 2193 // do we have to exit? 2194 warning("Kernel VM does not support flat profiling."); 2195#endif // FPROF_KERNEL 2196 // -Xaprof 2197 } else if (match_option(option, "-Xaprof", &tail)) { 2198 _has_alloc_profile = true; 2199 // -Xconcurrentio 2200 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2201 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2202 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2203 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2204 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2205 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2206 2207 // -Xinternalversion 2208 } else if (match_option(option, "-Xinternalversion", &tail)) { 2209 jio_fprintf(defaultStream::output_stream(), "%s\n", 2210 VM_Version::internal_vm_info_string()); 2211 vm_exit(0); 2212#ifndef PRODUCT 2213 // -Xprintflags 2214 } else if (match_option(option, "-Xprintflags", &tail)) { 2215 CommandLineFlags::printFlags(); 2216 vm_exit(0); 2217#endif 2218 // -D 2219 } else if (match_option(option, "-D", &tail)) { 2220 if (!add_property(tail)) { 2221 return JNI_ENOMEM; 2222 } 2223 // Out of the box management support 2224 if (match_option(option, "-Dcom.sun.management", &tail)) { 2225 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2226 } 2227 // -Xint 2228 } else if (match_option(option, "-Xint", &tail)) { 2229 set_mode_flags(_int); 2230 // -Xmixed 2231 } else if (match_option(option, "-Xmixed", &tail)) { 2232 set_mode_flags(_mixed); 2233 // -Xcomp 2234 } else if (match_option(option, "-Xcomp", &tail)) { 2235 // for testing the compiler; turn off all flags that inhibit compilation 2236 set_mode_flags(_comp); 2237 2238 // -Xshare:dump 2239 } else if (match_option(option, "-Xshare:dump", &tail)) { 2240#ifdef TIERED 2241 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2242 set_mode_flags(_int); // Prevent compilation, which creates objects 2243#elif defined(COMPILER2) 2244 vm_exit_during_initialization( 2245 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2246#elif defined(KERNEL) 2247 vm_exit_during_initialization( 2248 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2249#else 2250 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2251 set_mode_flags(_int); // Prevent compilation, which creates objects 2252#endif 2253 // -Xshare:on 2254 } else if (match_option(option, "-Xshare:on", &tail)) { 2255 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2256 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2257#ifdef TIERED 2258 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true); 2259#endif // TIERED 2260 // -Xshare:auto 2261 } else if (match_option(option, "-Xshare:auto", &tail)) { 2262 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2263 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2264 // -Xshare:off 2265 } else if (match_option(option, "-Xshare:off", &tail)) { 2266 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2267 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2268 2269 // -Xverify 2270 } else if (match_option(option, "-Xverify", &tail)) { 2271 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2272 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2273 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2274 } else if (strcmp(tail, ":remote") == 0) { 2275 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2276 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2277 } else if (strcmp(tail, ":none") == 0) { 2278 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2279 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2280 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2281 return JNI_EINVAL; 2282 } 2283 // -Xdebug 2284 } else if (match_option(option, "-Xdebug", &tail)) { 2285 // note this flag has been used, then ignore 2286 set_xdebug_mode(true); 2287 // -Xnoagent 2288 } else if (match_option(option, "-Xnoagent", &tail)) { 2289 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2290 } else if (match_option(option, "-Xboundthreads", &tail)) { 2291 // Bind user level threads to kernel threads (Solaris only) 2292 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2293 } else if (match_option(option, "-Xloggc:", &tail)) { 2294 // Redirect GC output to the file. -Xloggc:<filename> 2295 // ostream_init_log(), when called will use this filename 2296 // to initialize a fileStream. 2297 _gc_log_filename = strdup(tail); 2298 FLAG_SET_CMDLINE(bool, PrintGC, true); 2299 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2300 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2301 2302 // JNI hooks 2303 } else if (match_option(option, "-Xcheck", &tail)) { 2304 if (!strcmp(tail, ":jni")) { 2305 CheckJNICalls = true; 2306 } else if (is_bad_option(option, args->ignoreUnrecognized, 2307 "check")) { 2308 return JNI_EINVAL; 2309 } 2310 } else if (match_option(option, "vfprintf", &tail)) { 2311 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2312 } else if (match_option(option, "exit", &tail)) { 2313 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2314 } else if (match_option(option, "abort", &tail)) { 2315 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2316 // -XX:+AggressiveHeap 2317 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2318 2319 // This option inspects the machine and attempts to set various 2320 // parameters to be optimal for long-running, memory allocation 2321 // intensive jobs. It is intended for machines with large 2322 // amounts of cpu and memory. 2323 2324 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2325 // VM, but we may not be able to represent the total physical memory 2326 // available (like having 8gb of memory on a box but using a 32bit VM). 2327 // Thus, we need to make sure we're using a julong for intermediate 2328 // calculations. 2329 julong initHeapSize; 2330 julong total_memory = os::physical_memory(); 2331 2332 if (total_memory < (julong)256*M) { 2333 jio_fprintf(defaultStream::error_stream(), 2334 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2335 vm_exit(1); 2336 } 2337 2338 // The heap size is half of available memory, or (at most) 2339 // all of possible memory less 160mb (leaving room for the OS 2340 // when using ISM). This is the maximum; because adaptive sizing 2341 // is turned on below, the actual space used may be smaller. 2342 2343 initHeapSize = MIN2(total_memory / (julong)2, 2344 total_memory - (julong)160*M); 2345 2346 // Make sure that if we have a lot of memory we cap the 32 bit 2347 // process space. The 64bit VM version of this function is a nop. 2348 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2349 2350 // The perm gen is separate but contiguous with the 2351 // object heap (and is reserved with it) so subtract it 2352 // from the heap size. 2353 if (initHeapSize > MaxPermSize) { 2354 initHeapSize = initHeapSize - MaxPermSize; 2355 } else { 2356 warning("AggressiveHeap and MaxPermSize values may conflict"); 2357 } 2358 2359 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2360 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2361 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2362 // Currently the minimum size and the initial heap sizes are the same. 2363 set_min_heap_size(initHeapSize); 2364 } 2365 if (FLAG_IS_DEFAULT(NewSize)) { 2366 // Make the young generation 3/8ths of the total heap. 2367 FLAG_SET_CMDLINE(uintx, NewSize, 2368 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2369 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2370 } 2371 2372 FLAG_SET_DEFAULT(UseLargePages, true); 2373 2374 // Increase some data structure sizes for efficiency 2375 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2376 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2377 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2378 2379 // See the OldPLABSize comment below, but replace 'after promotion' 2380 // with 'after copying'. YoungPLABSize is the size of the survivor 2381 // space per-gc-thread buffers. The default is 4kw. 2382 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2383 2384 // OldPLABSize is the size of the buffers in the old gen that 2385 // UseParallelGC uses to promote live data that doesn't fit in the 2386 // survivor spaces. At any given time, there's one for each gc thread. 2387 // The default size is 1kw. These buffers are rarely used, since the 2388 // survivor spaces are usually big enough. For specjbb, however, there 2389 // are occasions when there's lots of live data in the young gen 2390 // and we end up promoting some of it. We don't have a definite 2391 // explanation for why bumping OldPLABSize helps, but the theory 2392 // is that a bigger PLAB results in retaining something like the 2393 // original allocation order after promotion, which improves mutator 2394 // locality. A minor effect may be that larger PLABs reduce the 2395 // number of PLAB allocation events during gc. The value of 8kw 2396 // was arrived at by experimenting with specjbb. 2397 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2398 2399 // CompilationPolicyChoice=0 causes the server compiler to adopt 2400 // a more conservative which-method-do-I-compile policy when one 2401 // of the counters maintained by the interpreter trips. The 2402 // result is reduced startup time and improved specjbb and 2403 // alacrity performance. Zero is the default, but we set it 2404 // explicitly here in case the default changes. 2405 // See runtime/compilationPolicy.*. 2406 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2407 2408 // Enable parallel GC and adaptive generation sizing 2409 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2410 FLAG_SET_DEFAULT(ParallelGCThreads, 2411 Abstract_VM_Version::parallel_worker_threads()); 2412 2413 // Encourage steady state memory management 2414 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2415 2416 // This appears to improve mutator locality 2417 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2418 2419 // Get around early Solaris scheduling bug 2420 // (affinity vs other jobs on system) 2421 // but disallow DR and offlining (5008695). 2422 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2423 2424 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2425 // The last option must always win. 2426 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2427 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2428 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2429 // The last option must always win. 2430 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2431 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2432 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2433 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2434 jio_fprintf(defaultStream::error_stream(), 2435 "Please use CMSClassUnloadingEnabled in place of " 2436 "CMSPermGenSweepingEnabled in the future\n"); 2437 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2438 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2439 jio_fprintf(defaultStream::error_stream(), 2440 "Please use -XX:+UseGCOverheadLimit in place of " 2441 "-XX:+UseGCTimeLimit in the future\n"); 2442 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2443 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2444 jio_fprintf(defaultStream::error_stream(), 2445 "Please use -XX:-UseGCOverheadLimit in place of " 2446 "-XX:-UseGCTimeLimit in the future\n"); 2447 // The TLE options are for compatibility with 1.3 and will be 2448 // removed without notice in a future release. These options 2449 // are not to be documented. 2450 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2451 // No longer used. 2452 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2453 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2454 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2455 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2456 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2457 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2458 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2459 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2460 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2461 // No longer used. 2462 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2463 julong long_tlab_size = 0; 2464 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2465 if (errcode != arg_in_range) { 2466 jio_fprintf(defaultStream::error_stream(), 2467 "Invalid TLAB size: %s\n", option->optionString); 2468 describe_range_error(errcode); 2469 return JNI_EINVAL; 2470 } 2471 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2472 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2473 // No longer used. 2474 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2475 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2476 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2477 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2478SOLARIS_ONLY( 2479 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2480 warning("-XX:+UsePermISM is obsolete."); 2481 FLAG_SET_CMDLINE(bool, UseISM, true); 2482 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2483 FLAG_SET_CMDLINE(bool, UseISM, false); 2484) 2485 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2486 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2487 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2488 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2489 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2490 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2491 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2492#ifdef SOLARIS 2493 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2494 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2495 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2496 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2497#else // ndef SOLARIS 2498 jio_fprintf(defaultStream::error_stream(), 2499 "ExtendedDTraceProbes flag is only applicable on Solaris\n"); 2500 return JNI_EINVAL; 2501#endif // ndef SOLARIS 2502#ifdef ASSERT 2503 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2504 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2505 // disable scavenge before parallel mark-compact 2506 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2507#endif 2508 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2509 julong cms_blocks_to_claim = (julong)atol(tail); 2510 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2511 jio_fprintf(defaultStream::error_stream(), 2512 "Please use -XX:OldPLABSize in place of " 2513 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2514 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2515 julong cms_blocks_to_claim = (julong)atol(tail); 2516 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2517 jio_fprintf(defaultStream::error_stream(), 2518 "Please use -XX:OldPLABSize in place of " 2519 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2520 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2521 julong old_plab_size = 0; 2522 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2523 if (errcode != arg_in_range) { 2524 jio_fprintf(defaultStream::error_stream(), 2525 "Invalid old PLAB size: %s\n", option->optionString); 2526 describe_range_error(errcode); 2527 return JNI_EINVAL; 2528 } 2529 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2530 jio_fprintf(defaultStream::error_stream(), 2531 "Please use -XX:OldPLABSize in place of " 2532 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2533 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2534 julong young_plab_size = 0; 2535 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2536 if (errcode != arg_in_range) { 2537 jio_fprintf(defaultStream::error_stream(), 2538 "Invalid young PLAB size: %s\n", option->optionString); 2539 describe_range_error(errcode); 2540 return JNI_EINVAL; 2541 } 2542 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2543 jio_fprintf(defaultStream::error_stream(), 2544 "Please use -XX:YoungPLABSize in place of " 2545 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2546 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2547 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2548 julong stack_size = 0; 2549 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2550 if (errcode != arg_in_range) { 2551 jio_fprintf(defaultStream::error_stream(), 2552 "Invalid mark stack size: %s\n", option->optionString); 2553 describe_range_error(errcode); 2554 return JNI_EINVAL; 2555 } 2556 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2557 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2558 julong max_stack_size = 0; 2559 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2560 if (errcode != arg_in_range) { 2561 jio_fprintf(defaultStream::error_stream(), 2562 "Invalid maximum mark stack size: %s\n", 2563 option->optionString); 2564 describe_range_error(errcode); 2565 return JNI_EINVAL; 2566 } 2567 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2568 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2569 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2570 uintx conc_threads = 0; 2571 if (!parse_uintx(tail, &conc_threads, 1)) { 2572 jio_fprintf(defaultStream::error_stream(), 2573 "Invalid concurrent threads: %s\n", option->optionString); 2574 return JNI_EINVAL; 2575 } 2576 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2577 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2578 // Skip -XX:Flags= since that case has already been handled 2579 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2580 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2581 return JNI_EINVAL; 2582 } 2583 } 2584 // Unknown option 2585 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2586 return JNI_ERR; 2587 } 2588 } 2589 // Change the default value for flags which have different default values 2590 // when working with older JDKs. 2591 if (JDK_Version::current().compare_major(6) <= 0 && 2592 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2593 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2594 } 2595 return JNI_OK; 2596} 2597 2598jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2599 // This must be done after all -D arguments have been processed. 2600 scp_p->expand_endorsed(); 2601 2602 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2603 // Assemble the bootclasspath elements into the final path. 2604 Arguments::set_sysclasspath(scp_p->combined_path()); 2605 } 2606 2607 // This must be done after all arguments have been processed. 2608 // java_compiler() true means set to "NONE" or empty. 2609 if (java_compiler() && !xdebug_mode()) { 2610 // For backwards compatibility, we switch to interpreted mode if 2611 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2612 // not specified. 2613 set_mode_flags(_int); 2614 } 2615 if (CompileThreshold == 0) { 2616 set_mode_flags(_int); 2617 } 2618 2619#ifdef TIERED 2620 // If we are using tiered compilation in the tiered vm then c1 will 2621 // do the profiling and we don't want to waste that time in the 2622 // interpreter. 2623 if (TieredCompilation) { 2624 ProfileInterpreter = false; 2625 } else { 2626 // Since we are running vanilla server we must adjust the compile threshold 2627 // unless the user has already adjusted it because the default threshold assumes 2628 // we will run tiered. 2629 2630 if (FLAG_IS_DEFAULT(CompileThreshold)) { 2631 CompileThreshold = Tier2CompileThreshold; 2632 } 2633 } 2634#endif // TIERED 2635 2636#ifndef COMPILER2 2637 // Don't degrade server performance for footprint 2638 if (FLAG_IS_DEFAULT(UseLargePages) && 2639 MaxHeapSize < LargePageHeapSizeThreshold) { 2640 // No need for large granularity pages w/small heaps. 2641 // Note that large pages are enabled/disabled for both the 2642 // Java heap and the code cache. 2643 FLAG_SET_DEFAULT(UseLargePages, false); 2644 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2645 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2646 } 2647 2648 // Tiered compilation is undefined with C1. 2649 TieredCompilation = false; 2650 2651#else 2652 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2653 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2654 } 2655 // Temporary disable bulk zeroing reduction with G1. See CR 6627983. 2656 if (UseG1GC) { 2657 FLAG_SET_DEFAULT(ReduceBulkZeroing, false); 2658 } 2659#endif 2660 2661 if (!check_vm_args_consistency()) { 2662 return JNI_ERR; 2663 } 2664 2665 return JNI_OK; 2666} 2667 2668jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2669 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2670 scp_assembly_required_p); 2671} 2672 2673jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2674 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2675 scp_assembly_required_p); 2676} 2677 2678jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2679 const int N_MAX_OPTIONS = 64; 2680 const int OPTION_BUFFER_SIZE = 1024; 2681 char buffer[OPTION_BUFFER_SIZE]; 2682 2683 // The variable will be ignored if it exceeds the length of the buffer. 2684 // Don't check this variable if user has special privileges 2685 // (e.g. unix su command). 2686 if (os::getenv(name, buffer, sizeof(buffer)) && 2687 !os::have_special_privileges()) { 2688 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2689 jio_fprintf(defaultStream::error_stream(), 2690 "Picked up %s: %s\n", name, buffer); 2691 char* rd = buffer; // pointer to the input string (rd) 2692 int i; 2693 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2694 while (isspace(*rd)) rd++; // skip whitespace 2695 if (*rd == 0) break; // we re done when the input string is read completely 2696 2697 // The output, option string, overwrites the input string. 2698 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2699 // input string (rd). 2700 char* wrt = rd; 2701 2702 options[i++].optionString = wrt; // Fill in option 2703 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2704 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2705 int quote = *rd; // matching quote to look for 2706 rd++; // don't copy open quote 2707 while (*rd != quote) { // include everything (even spaces) up until quote 2708 if (*rd == 0) { // string termination means unmatched string 2709 jio_fprintf(defaultStream::error_stream(), 2710 "Unmatched quote in %s\n", name); 2711 return JNI_ERR; 2712 } 2713 *wrt++ = *rd++; // copy to option string 2714 } 2715 rd++; // don't copy close quote 2716 } else { 2717 *wrt++ = *rd++; // copy to option string 2718 } 2719 } 2720 // Need to check if we're done before writing a NULL, 2721 // because the write could be to the byte that rd is pointing to. 2722 if (*rd++ == 0) { 2723 *wrt = 0; 2724 break; 2725 } 2726 *wrt = 0; // Zero terminate option 2727 } 2728 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2729 JavaVMInitArgs vm_args; 2730 vm_args.version = JNI_VERSION_1_2; 2731 vm_args.options = options; 2732 vm_args.nOptions = i; 2733 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2734 2735 if (PrintVMOptions) { 2736 const char* tail; 2737 for (int i = 0; i < vm_args.nOptions; i++) { 2738 const JavaVMOption *option = vm_args.options + i; 2739 if (match_option(option, "-XX:", &tail)) { 2740 logOption(tail); 2741 } 2742 } 2743 } 2744 2745 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2746 } 2747 return JNI_OK; 2748} 2749 2750// Parse entry point called from JNI_CreateJavaVM 2751 2752jint Arguments::parse(const JavaVMInitArgs* args) { 2753 2754 // Sharing support 2755 // Construct the path to the archive 2756 char jvm_path[JVM_MAXPATHLEN]; 2757 os::jvm_path(jvm_path, sizeof(jvm_path)); 2758#ifdef TIERED 2759 if (strstr(jvm_path, "client") != NULL) { 2760 force_client_mode = true; 2761 } 2762#endif // TIERED 2763 char *end = strrchr(jvm_path, *os::file_separator()); 2764 if (end != NULL) *end = '\0'; 2765 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2766 strlen(os::file_separator()) + 20); 2767 if (shared_archive_path == NULL) return JNI_ENOMEM; 2768 strcpy(shared_archive_path, jvm_path); 2769 strcat(shared_archive_path, os::file_separator()); 2770 strcat(shared_archive_path, "classes"); 2771 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2772 strcat(shared_archive_path, ".jsa"); 2773 SharedArchivePath = shared_archive_path; 2774 2775 // Remaining part of option string 2776 const char* tail; 2777 2778 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2779 bool settings_file_specified = false; 2780 const char* flags_file; 2781 int index; 2782 for (index = 0; index < args->nOptions; index++) { 2783 const JavaVMOption *option = args->options + index; 2784 if (match_option(option, "-XX:Flags=", &tail)) { 2785 flags_file = tail; 2786 settings_file_specified = true; 2787 } 2788 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2789 PrintVMOptions = true; 2790 } 2791 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2792 PrintVMOptions = false; 2793 } 2794 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2795 IgnoreUnrecognizedVMOptions = true; 2796 } 2797 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2798 IgnoreUnrecognizedVMOptions = false; 2799 } 2800 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 2801 CommandLineFlags::printFlags(); 2802 vm_exit(0); 2803 } 2804 } 2805 2806 if (IgnoreUnrecognizedVMOptions) { 2807 // uncast const to modify the flag args->ignoreUnrecognized 2808 *(jboolean*)(&args->ignoreUnrecognized) = true; 2809 } 2810 2811 // Parse specified settings file 2812 if (settings_file_specified) { 2813 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 2814 return JNI_EINVAL; 2815 } 2816 } 2817 2818 // Parse default .hotspotrc settings file 2819 if (!settings_file_specified) { 2820 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 2821 return JNI_EINVAL; 2822 } 2823 } 2824 2825 if (PrintVMOptions) { 2826 for (index = 0; index < args->nOptions; index++) { 2827 const JavaVMOption *option = args->options + index; 2828 if (match_option(option, "-XX:", &tail)) { 2829 logOption(tail); 2830 } 2831 } 2832 } 2833 2834 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 2835 jint result = parse_vm_init_args(args); 2836 if (result != JNI_OK) { 2837 return result; 2838 } 2839 2840#ifndef PRODUCT 2841 if (TraceBytecodesAt != 0) { 2842 TraceBytecodes = true; 2843 } 2844 if (CountCompiledCalls) { 2845 if (UseCounterDecay) { 2846 warning("UseCounterDecay disabled because CountCalls is set"); 2847 UseCounterDecay = false; 2848 } 2849 } 2850#endif // PRODUCT 2851 2852 if (EnableInvokeDynamic && !EnableMethodHandles) { 2853 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) { 2854 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true"); 2855 } 2856 EnableMethodHandles = true; 2857 } 2858 if (EnableMethodHandles && !AnonymousClasses) { 2859 if (!FLAG_IS_DEFAULT(AnonymousClasses)) { 2860 warning("forcing AnonymousClasses true because EnableMethodHandles is true"); 2861 } 2862 AnonymousClasses = true; 2863 } 2864 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) { 2865 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 2866 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true"); 2867 } 2868 ScavengeRootsInCode = 1; 2869 } 2870#ifdef COMPILER2 2871 if (EnableInvokeDynamic && DoEscapeAnalysis) { 2872 // TODO: We need to find rules for invokedynamic and EA. For now, 2873 // simply disable EA by default. 2874 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2875 DoEscapeAnalysis = false; 2876 } 2877 } 2878#endif 2879 2880 if (PrintGCDetails) { 2881 // Turn on -verbose:gc options as well 2882 PrintGC = true; 2883 } 2884 2885#if defined(_LP64) && defined(COMPILER1) 2886 UseCompressedOops = false; 2887#endif 2888 2889 // Set object alignment values. 2890 set_object_alignment(); 2891 2892#ifdef SERIALGC 2893 force_serial_gc(); 2894#endif // SERIALGC 2895#ifdef KERNEL 2896 no_shared_spaces(); 2897#endif // KERNEL 2898 2899 // Set flags based on ergonomics. 2900 set_ergonomics_flags(); 2901 2902#ifdef _LP64 2903 // XXX JSR 292 currently does not support compressed oops. 2904 if (EnableMethodHandles && UseCompressedOops) { 2905 if (FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops)) { 2906 UseCompressedOops = false; 2907 } 2908 } 2909#endif // _LP64 2910 2911 // Check the GC selections again. 2912 if (!check_gc_consistency()) { 2913 return JNI_EINVAL; 2914 } 2915 2916#ifndef KERNEL 2917 if (UseConcMarkSweepGC) { 2918 // Set flags for CMS and ParNew. Check UseConcMarkSweep first 2919 // to ensure that when both UseConcMarkSweepGC and UseParNewGC 2920 // are true, we don't call set_parnew_gc_flags() as well. 2921 set_cms_and_parnew_gc_flags(); 2922 } else { 2923 // Set heap size based on available physical memory 2924 set_heap_size(); 2925 // Set per-collector flags 2926 if (UseParallelGC || UseParallelOldGC) { 2927 set_parallel_gc_flags(); 2928 } else if (UseParNewGC) { 2929 set_parnew_gc_flags(); 2930 } else if (UseG1GC) { 2931 set_g1_gc_flags(); 2932 } 2933 } 2934#endif // KERNEL 2935 2936#ifdef SERIALGC 2937 assert(verify_serial_gc_flags(), "SerialGC unset"); 2938#endif // SERIALGC 2939 2940 // Set bytecode rewriting flags 2941 set_bytecode_flags(); 2942 2943 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 2944 set_aggressive_opts_flags(); 2945 2946#ifdef CC_INTERP 2947 // Clear flags not supported by the C++ interpreter 2948 FLAG_SET_DEFAULT(ProfileInterpreter, false); 2949 FLAG_SET_DEFAULT(UseBiasedLocking, false); 2950 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 2951#endif // CC_INTERP 2952 2953#ifdef COMPILER2 2954 if (!UseBiasedLocking || EmitSync != 0) { 2955 UseOptoBiasInlining = false; 2956 } 2957#endif 2958 2959 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 2960 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 2961 DebugNonSafepoints = true; 2962 } 2963 2964#ifndef PRODUCT 2965 if (CompileTheWorld) { 2966 // Force NmethodSweeper to sweep whole CodeCache each time. 2967 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 2968 NmethodSweepFraction = 1; 2969 } 2970 } 2971#endif 2972 2973 if (PrintCommandLineFlags) { 2974 CommandLineFlags::printSetFlags(); 2975 } 2976 2977 if (PrintFlagsFinal) { 2978 CommandLineFlags::printFlags(); 2979 } 2980 2981 return JNI_OK; 2982} 2983 2984int Arguments::PropertyList_count(SystemProperty* pl) { 2985 int count = 0; 2986 while(pl != NULL) { 2987 count++; 2988 pl = pl->next(); 2989 } 2990 return count; 2991} 2992 2993const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 2994 assert(key != NULL, "just checking"); 2995 SystemProperty* prop; 2996 for (prop = pl; prop != NULL; prop = prop->next()) { 2997 if (strcmp(key, prop->key()) == 0) return prop->value(); 2998 } 2999 return NULL; 3000} 3001 3002const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3003 int count = 0; 3004 const char* ret_val = NULL; 3005 3006 while(pl != NULL) { 3007 if(count >= index) { 3008 ret_val = pl->key(); 3009 break; 3010 } 3011 count++; 3012 pl = pl->next(); 3013 } 3014 3015 return ret_val; 3016} 3017 3018char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3019 int count = 0; 3020 char* ret_val = NULL; 3021 3022 while(pl != NULL) { 3023 if(count >= index) { 3024 ret_val = pl->value(); 3025 break; 3026 } 3027 count++; 3028 pl = pl->next(); 3029 } 3030 3031 return ret_val; 3032} 3033 3034void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3035 SystemProperty* p = *plist; 3036 if (p == NULL) { 3037 *plist = new_p; 3038 } else { 3039 while (p->next() != NULL) { 3040 p = p->next(); 3041 } 3042 p->set_next(new_p); 3043 } 3044} 3045 3046void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3047 if (plist == NULL) 3048 return; 3049 3050 SystemProperty* new_p = new SystemProperty(k, v, true); 3051 PropertyList_add(plist, new_p); 3052} 3053 3054// This add maintains unique property key in the list. 3055void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3056 if (plist == NULL) 3057 return; 3058 3059 // If property key exist then update with new value. 3060 SystemProperty* prop; 3061 for (prop = *plist; prop != NULL; prop = prop->next()) { 3062 if (strcmp(k, prop->key()) == 0) { 3063 if (append) { 3064 prop->append_value(v); 3065 } else { 3066 prop->set_value(v); 3067 } 3068 return; 3069 } 3070 } 3071 3072 PropertyList_add(plist, k, v); 3073} 3074 3075#ifdef KERNEL 3076char *Arguments::get_kernel_properties() { 3077 // Find properties starting with kernel and append them to string 3078 // We need to find out how long they are first because the URL's that they 3079 // might point to could get long. 3080 int length = 0; 3081 SystemProperty* prop; 3082 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3083 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3084 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3085 } 3086 } 3087 // Add one for null terminator. 3088 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 3089 if (length != 0) { 3090 int pos = 0; 3091 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3092 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3093 jio_snprintf(&props[pos], length-pos, 3094 "-D%s=%s ", prop->key(), prop->value()); 3095 pos = strlen(props); 3096 } 3097 } 3098 } 3099 // null terminate props in case of null 3100 props[length] = '\0'; 3101 return props; 3102} 3103#endif // KERNEL 3104 3105// Copies src into buf, replacing "%%" with "%" and "%p" with pid 3106// Returns true if all of the source pointed by src has been copied over to 3107// the destination buffer pointed by buf. Otherwise, returns false. 3108// Notes: 3109// 1. If the length (buflen) of the destination buffer excluding the 3110// NULL terminator character is not long enough for holding the expanded 3111// pid characters, it also returns false instead of returning the partially 3112// expanded one. 3113// 2. The passed in "buflen" should be large enough to hold the null terminator. 3114bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3115 char* buf, size_t buflen) { 3116 const char* p = src; 3117 char* b = buf; 3118 const char* src_end = &src[srclen]; 3119 char* buf_end = &buf[buflen - 1]; 3120 3121 while (p < src_end && b < buf_end) { 3122 if (*p == '%') { 3123 switch (*(++p)) { 3124 case '%': // "%%" ==> "%" 3125 *b++ = *p++; 3126 break; 3127 case 'p': { // "%p" ==> current process id 3128 // buf_end points to the character before the last character so 3129 // that we could write '\0' to the end of the buffer. 3130 size_t buf_sz = buf_end - b + 1; 3131 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3132 3133 // if jio_snprintf fails or the buffer is not long enough to hold 3134 // the expanded pid, returns false. 3135 if (ret < 0 || ret >= (int)buf_sz) { 3136 return false; 3137 } else { 3138 b += ret; 3139 assert(*b == '\0', "fail in copy_expand_pid"); 3140 if (p == src_end && b == buf_end + 1) { 3141 // reach the end of the buffer. 3142 return true; 3143 } 3144 } 3145 p++; 3146 break; 3147 } 3148 default : 3149 *b++ = '%'; 3150 } 3151 } else { 3152 *b++ = *p++; 3153 } 3154 } 3155 *b = '\0'; 3156 return (p == src_end); // return false if not all of the source was copied 3157} 3158