arguments.cpp revision 579:0fbdb4381b99
1/* 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#include "incls/_precompiled.incl" 26#include "incls/_arguments.cpp.incl" 27 28#define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp" 29#define DEFAULT_JAVA_LAUNCHER "generic" 30 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::_initial_heap_size = 0; 41uintx Arguments::_min_heap_size = 0; 42Arguments::Mode Arguments::_mode = _mixed; 43bool Arguments::_java_compiler = false; 44bool Arguments::_xdebug_mode = false; 45const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 46const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 47int Arguments::_sun_java_launcher_pid = -1; 48 49// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 50bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 51bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 52bool Arguments::_BackgroundCompilation = BackgroundCompilation; 53bool Arguments::_ClipInlining = ClipInlining; 54intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold; 55 56char* Arguments::SharedArchivePath = NULL; 57 58AgentLibraryList Arguments::_libraryList; 59AgentLibraryList Arguments::_agentList; 60 61abort_hook_t Arguments::_abort_hook = NULL; 62exit_hook_t Arguments::_exit_hook = NULL; 63vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 64 65 66SystemProperty *Arguments::_java_ext_dirs = NULL; 67SystemProperty *Arguments::_java_endorsed_dirs = NULL; 68SystemProperty *Arguments::_sun_boot_library_path = NULL; 69SystemProperty *Arguments::_java_library_path = NULL; 70SystemProperty *Arguments::_java_home = NULL; 71SystemProperty *Arguments::_java_class_path = NULL; 72SystemProperty *Arguments::_sun_boot_class_path = NULL; 73 74char* Arguments::_meta_index_path = NULL; 75char* Arguments::_meta_index_dir = NULL; 76 77static bool force_client_mode = false; 78 79// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 80 81static bool match_option(const JavaVMOption *option, const char* name, 82 const char** tail) { 83 int len = (int)strlen(name); 84 if (strncmp(option->optionString, name, len) == 0) { 85 *tail = option->optionString + len; 86 return true; 87 } else { 88 return false; 89 } 90} 91 92static void logOption(const char* opt) { 93 if (PrintVMOptions) { 94 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 95 } 96} 97 98// Process java launcher properties. 99void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 100 // See if sun.java.launcher or sun.java.launcher.pid is defined. 101 // Must do this before setting up other system properties, 102 // as some of them may depend on launcher type. 103 for (int index = 0; index < args->nOptions; index++) { 104 const JavaVMOption* option = args->options + index; 105 const char* tail; 106 107 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 108 process_java_launcher_argument(tail, option->extraInfo); 109 continue; 110 } 111 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 112 _sun_java_launcher_pid = atoi(tail); 113 continue; 114 } 115 } 116} 117 118// Initialize system properties key and value. 119void Arguments::init_system_properties() { 120 121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false)); 122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 123 "Java Virtual Machine Specification", false)); 124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor", 125 "Sun Microsystems Inc.", false)); 126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 129 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 130 131 // following are JVMTI agent writeable properties. 132 // Properties values are set to NULL and they are 133 // os specific they are initialized in os::init_system_properties_values(). 134 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 135 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 136 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 137 _java_library_path = new SystemProperty("java.library.path", NULL, true); 138 _java_home = new SystemProperty("java.home", NULL, true); 139 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 140 141 _java_class_path = new SystemProperty("java.class.path", "", true); 142 143 // Add to System Property list. 144 PropertyList_add(&_system_properties, _java_ext_dirs); 145 PropertyList_add(&_system_properties, _java_endorsed_dirs); 146 PropertyList_add(&_system_properties, _sun_boot_library_path); 147 PropertyList_add(&_system_properties, _java_library_path); 148 PropertyList_add(&_system_properties, _java_home); 149 PropertyList_add(&_system_properties, _java_class_path); 150 PropertyList_add(&_system_properties, _sun_boot_class_path); 151 152 // Set OS specific system properties values 153 os::init_system_properties_values(); 154} 155 156/** 157 * Provide a slightly more user-friendly way of eliminating -XX flags. 158 * When a flag is eliminated, it can be added to this list in order to 159 * continue accepting this flag on the command-line, while issuing a warning 160 * and ignoring the value. Once the JDK version reaches the 'accept_until' 161 * limit, we flatly refuse to admit the existence of the flag. This allows 162 * a flag to die correctly over JDK releases using HSX. 163 */ 164typedef struct { 165 const char* name; 166 JDK_Version obsoleted_in; // when the flag went away 167 JDK_Version accept_until; // which version to start denying the existence 168} ObsoleteFlag; 169 170static ObsoleteFlag obsolete_jvm_flags[] = { 171 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 172 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 173 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 174 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 175 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 176 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 177 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 178 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 179 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 180 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 181 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 182 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 183 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 184 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 185 { NULL, JDK_Version(0), JDK_Version(0) } 186}; 187 188// Returns true if the flag is obsolete and fits into the range specified 189// for being ignored. In the case that the flag is ignored, the 'version' 190// value is filled in with the version number when the flag became 191// obsolete so that that value can be displayed to the user. 192bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 193 int i = 0; 194 assert(version != NULL, "Must provide a version buffer"); 195 while (obsolete_jvm_flags[i].name != NULL) { 196 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 197 // <flag>=xxx form 198 // [-|+]<flag> form 199 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 200 ((s[0] == '+' || s[0] == '-') && 201 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 202 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 203 *version = flag_status.obsoleted_in; 204 return true; 205 } 206 } 207 i++; 208 } 209 return false; 210} 211 212// Constructs the system class path (aka boot class path) from the following 213// components, in order: 214// 215// prefix // from -Xbootclasspath/p:... 216// endorsed // the expansion of -Djava.endorsed.dirs=... 217// base // from os::get_system_properties() or -Xbootclasspath= 218// suffix // from -Xbootclasspath/a:... 219// 220// java.endorsed.dirs is a list of directories; any jar or zip files in the 221// directories are added to the sysclasspath just before the base. 222// 223// This could be AllStatic, but it isn't needed after argument processing is 224// complete. 225class SysClassPath: public StackObj { 226public: 227 SysClassPath(const char* base); 228 ~SysClassPath(); 229 230 inline void set_base(const char* base); 231 inline void add_prefix(const char* prefix); 232 inline void add_suffix_to_prefix(const char* suffix); 233 inline void add_suffix(const char* suffix); 234 inline void reset_path(const char* base); 235 236 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 237 // property. Must be called after all command-line arguments have been 238 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 239 // combined_path(). 240 void expand_endorsed(); 241 242 inline const char* get_base() const { return _items[_scp_base]; } 243 inline const char* get_prefix() const { return _items[_scp_prefix]; } 244 inline const char* get_suffix() const { return _items[_scp_suffix]; } 245 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 246 247 // Combine all the components into a single c-heap-allocated string; caller 248 // must free the string if/when no longer needed. 249 char* combined_path(); 250 251private: 252 // Utility routines. 253 static char* add_to_path(const char* path, const char* str, bool prepend); 254 static char* add_jars_to_path(char* path, const char* directory); 255 256 inline void reset_item_at(int index); 257 258 // Array indices for the items that make up the sysclasspath. All except the 259 // base are allocated in the C heap and freed by this class. 260 enum { 261 _scp_prefix, // from -Xbootclasspath/p:... 262 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 263 _scp_base, // the default sysclasspath 264 _scp_suffix, // from -Xbootclasspath/a:... 265 _scp_nitems // the number of items, must be last. 266 }; 267 268 const char* _items[_scp_nitems]; 269 DEBUG_ONLY(bool _expansion_done;) 270}; 271 272SysClassPath::SysClassPath(const char* base) { 273 memset(_items, 0, sizeof(_items)); 274 _items[_scp_base] = base; 275 DEBUG_ONLY(_expansion_done = false;) 276} 277 278SysClassPath::~SysClassPath() { 279 // Free everything except the base. 280 for (int i = 0; i < _scp_nitems; ++i) { 281 if (i != _scp_base) reset_item_at(i); 282 } 283 DEBUG_ONLY(_expansion_done = false;) 284} 285 286inline void SysClassPath::set_base(const char* base) { 287 _items[_scp_base] = base; 288} 289 290inline void SysClassPath::add_prefix(const char* prefix) { 291 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 292} 293 294inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 295 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 296} 297 298inline void SysClassPath::add_suffix(const char* suffix) { 299 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 300} 301 302inline void SysClassPath::reset_item_at(int index) { 303 assert(index < _scp_nitems && index != _scp_base, "just checking"); 304 if (_items[index] != NULL) { 305 FREE_C_HEAP_ARRAY(char, _items[index]); 306 _items[index] = NULL; 307 } 308} 309 310inline void SysClassPath::reset_path(const char* base) { 311 // Clear the prefix and suffix. 312 reset_item_at(_scp_prefix); 313 reset_item_at(_scp_suffix); 314 set_base(base); 315} 316 317//------------------------------------------------------------------------------ 318 319void SysClassPath::expand_endorsed() { 320 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 321 322 const char* path = Arguments::get_property("java.endorsed.dirs"); 323 if (path == NULL) { 324 path = Arguments::get_endorsed_dir(); 325 assert(path != NULL, "no default for java.endorsed.dirs"); 326 } 327 328 char* expanded_path = NULL; 329 const char separator = *os::path_separator(); 330 const char* const end = path + strlen(path); 331 while (path < end) { 332 const char* tmp_end = strchr(path, separator); 333 if (tmp_end == NULL) { 334 expanded_path = add_jars_to_path(expanded_path, path); 335 path = end; 336 } else { 337 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1); 338 memcpy(dirpath, path, tmp_end - path); 339 dirpath[tmp_end - path] = '\0'; 340 expanded_path = add_jars_to_path(expanded_path, dirpath); 341 FREE_C_HEAP_ARRAY(char, dirpath); 342 path = tmp_end + 1; 343 } 344 } 345 _items[_scp_endorsed] = expanded_path; 346 DEBUG_ONLY(_expansion_done = true;) 347} 348 349// Combine the bootclasspath elements, some of which may be null, into a single 350// c-heap-allocated string. 351char* SysClassPath::combined_path() { 352 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 353 assert(_expansion_done, "must call expand_endorsed() first."); 354 355 size_t lengths[_scp_nitems]; 356 size_t total_len = 0; 357 358 const char separator = *os::path_separator(); 359 360 // Get the lengths. 361 int i; 362 for (i = 0; i < _scp_nitems; ++i) { 363 if (_items[i] != NULL) { 364 lengths[i] = strlen(_items[i]); 365 // Include space for the separator char (or a NULL for the last item). 366 total_len += lengths[i] + 1; 367 } 368 } 369 assert(total_len > 0, "empty sysclasspath not allowed"); 370 371 // Copy the _items to a single string. 372 char* cp = NEW_C_HEAP_ARRAY(char, total_len); 373 char* cp_tmp = cp; 374 for (i = 0; i < _scp_nitems; ++i) { 375 if (_items[i] != NULL) { 376 memcpy(cp_tmp, _items[i], lengths[i]); 377 cp_tmp += lengths[i]; 378 *cp_tmp++ = separator; 379 } 380 } 381 *--cp_tmp = '\0'; // Replace the extra separator. 382 return cp; 383} 384 385// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 386char* 387SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 388 char *cp; 389 390 assert(str != NULL, "just checking"); 391 if (path == NULL) { 392 size_t len = strlen(str) + 1; 393 cp = NEW_C_HEAP_ARRAY(char, len); 394 memcpy(cp, str, len); // copy the trailing null 395 } else { 396 const char separator = *os::path_separator(); 397 size_t old_len = strlen(path); 398 size_t str_len = strlen(str); 399 size_t len = old_len + str_len + 2; 400 401 if (prepend) { 402 cp = NEW_C_HEAP_ARRAY(char, len); 403 char* cp_tmp = cp; 404 memcpy(cp_tmp, str, str_len); 405 cp_tmp += str_len; 406 *cp_tmp = separator; 407 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 408 FREE_C_HEAP_ARRAY(char, path); 409 } else { 410 cp = REALLOC_C_HEAP_ARRAY(char, path, len); 411 char* cp_tmp = cp + old_len; 412 *cp_tmp = separator; 413 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 414 } 415 } 416 return cp; 417} 418 419// Scan the directory and append any jar or zip files found to path. 420// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 421char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 422 DIR* dir = os::opendir(directory); 423 if (dir == NULL) return path; 424 425 char dir_sep[2] = { '\0', '\0' }; 426 size_t directory_len = strlen(directory); 427 const char fileSep = *os::file_separator(); 428 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 429 430 /* Scan the directory for jars/zips, appending them to path. */ 431 struct dirent *entry; 432 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory)); 433 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 434 const char* name = entry->d_name; 435 const char* ext = name + strlen(name) - 4; 436 bool isJarOrZip = ext > name && 437 (os::file_name_strcmp(ext, ".jar") == 0 || 438 os::file_name_strcmp(ext, ".zip") == 0); 439 if (isJarOrZip) { 440 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name)); 441 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 442 path = add_to_path(path, jarpath, false); 443 FREE_C_HEAP_ARRAY(char, jarpath); 444 } 445 } 446 FREE_C_HEAP_ARRAY(char, dbuf); 447 os::closedir(dir); 448 return path; 449} 450 451// Parses a memory size specification string. 452static bool atomull(const char *s, julong* result) { 453 julong n = 0; 454 int args_read = sscanf(s, os::julong_format_specifier(), &n); 455 if (args_read != 1) { 456 return false; 457 } 458 while (*s != '\0' && isdigit(*s)) { 459 s++; 460 } 461 // 4705540: illegal if more characters are found after the first non-digit 462 if (strlen(s) > 1) { 463 return false; 464 } 465 switch (*s) { 466 case 'T': case 't': 467 *result = n * G * K; 468 // Check for overflow. 469 if (*result/((julong)G * K) != n) return false; 470 return true; 471 case 'G': case 'g': 472 *result = n * G; 473 if (*result/G != n) return false; 474 return true; 475 case 'M': case 'm': 476 *result = n * M; 477 if (*result/M != n) return false; 478 return true; 479 case 'K': case 'k': 480 *result = n * K; 481 if (*result/K != n) return false; 482 return true; 483 case '\0': 484 *result = n; 485 return true; 486 default: 487 return false; 488 } 489} 490 491Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 492 if (size < min_size) return arg_too_small; 493 // Check that size will fit in a size_t (only relevant on 32-bit) 494 if (size > max_uintx) return arg_too_big; 495 return arg_in_range; 496} 497 498// Describe an argument out of range error 499void Arguments::describe_range_error(ArgsRange errcode) { 500 switch(errcode) { 501 case arg_too_big: 502 jio_fprintf(defaultStream::error_stream(), 503 "The specified size exceeds the maximum " 504 "representable size.\n"); 505 break; 506 case arg_too_small: 507 case arg_unreadable: 508 case arg_in_range: 509 // do nothing for now 510 break; 511 default: 512 ShouldNotReachHere(); 513 } 514} 515 516static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 517 return CommandLineFlags::boolAtPut(name, &value, origin); 518} 519 520static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 521 double v; 522 if (sscanf(value, "%lf", &v) != 1) { 523 return false; 524 } 525 526 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 527 return true; 528 } 529 return false; 530} 531 532static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 533 julong v; 534 intx intx_v; 535 bool is_neg = false; 536 // Check the sign first since atomull() parses only unsigned values. 537 if (*value == '-') { 538 if (!CommandLineFlags::intxAt(name, &intx_v)) { 539 return false; 540 } 541 value++; 542 is_neg = true; 543 } 544 if (!atomull(value, &v)) { 545 return false; 546 } 547 intx_v = (intx) v; 548 if (is_neg) { 549 intx_v = -intx_v; 550 } 551 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 552 return true; 553 } 554 uintx uintx_v = (uintx) v; 555 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 556 return true; 557 } 558 return false; 559} 560 561static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 562 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 563 // Contract: CommandLineFlags always returns a pointer that needs freeing. 564 FREE_C_HEAP_ARRAY(char, value); 565 return true; 566} 567 568static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 569 const char* old_value = ""; 570 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 571 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 572 size_t new_len = strlen(new_value); 573 const char* value; 574 char* free_this_too = NULL; 575 if (old_len == 0) { 576 value = new_value; 577 } else if (new_len == 0) { 578 value = old_value; 579 } else { 580 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1); 581 // each new setting adds another LINE to the switch: 582 sprintf(buf, "%s\n%s", old_value, new_value); 583 value = buf; 584 free_this_too = buf; 585 } 586 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 587 // CommandLineFlags always returns a pointer that needs freeing. 588 FREE_C_HEAP_ARRAY(char, value); 589 if (free_this_too != NULL) { 590 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 591 FREE_C_HEAP_ARRAY(char, free_this_too); 592 } 593 return true; 594} 595 596bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 597 598 // range of acceptable characters spelled out for portability reasons 599#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 600#define BUFLEN 255 601 char name[BUFLEN+1]; 602 char dummy; 603 604 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 605 return set_bool_flag(name, false, origin); 606 } 607 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 608 return set_bool_flag(name, true, origin); 609 } 610 611 char punct; 612 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 613 const char* value = strchr(arg, '=') + 1; 614 Flag* flag = Flag::find_flag(name, strlen(name)); 615 if (flag != NULL && flag->is_ccstr()) { 616 if (flag->ccstr_accumulates()) { 617 return append_to_string_flag(name, value, origin); 618 } else { 619 if (value[0] == '\0') { 620 value = NULL; 621 } 622 return set_string_flag(name, value, origin); 623 } 624 } 625 } 626 627 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 628 const char* value = strchr(arg, '=') + 1; 629 // -XX:Foo:=xxx will reset the string flag to the given value. 630 if (value[0] == '\0') { 631 value = NULL; 632 } 633 return set_string_flag(name, value, origin); 634 } 635 636#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 637#define SIGNED_NUMBER_RANGE "[-0123456789]" 638#define NUMBER_RANGE "[0123456789]" 639 char value[BUFLEN + 1]; 640 char value2[BUFLEN + 1]; 641 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 642 // Looks like a floating-point number -- try again with more lenient format string 643 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 644 return set_fp_numeric_flag(name, value, origin); 645 } 646 } 647 648#define VALUE_RANGE "[-kmgtKMGT0123456789]" 649 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 650 return set_numeric_flag(name, value, origin); 651 } 652 653 return false; 654} 655 656void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 657 assert(bldarray != NULL, "illegal argument"); 658 659 if (arg == NULL) { 660 return; 661 } 662 663 int index = *count; 664 665 // expand the array and add arg to the last element 666 (*count)++; 667 if (*bldarray == NULL) { 668 *bldarray = NEW_C_HEAP_ARRAY(char*, *count); 669 } else { 670 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count); 671 } 672 (*bldarray)[index] = strdup(arg); 673} 674 675void Arguments::build_jvm_args(const char* arg) { 676 add_string(&_jvm_args_array, &_num_jvm_args, arg); 677} 678 679void Arguments::build_jvm_flags(const char* arg) { 680 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 681} 682 683// utility function to return a string that concatenates all 684// strings in a given char** array 685const char* Arguments::build_resource_string(char** args, int count) { 686 if (args == NULL || count == 0) { 687 return NULL; 688 } 689 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 690 for (int i = 1; i < count; i++) { 691 length += strlen(args[i]) + 1; // add 1 for a space 692 } 693 char* s = NEW_RESOURCE_ARRAY(char, length); 694 strcpy(s, args[0]); 695 for (int j = 1; j < count; j++) { 696 strcat(s, " "); 697 strcat(s, args[j]); 698 } 699 return (const char*) s; 700} 701 702void Arguments::print_on(outputStream* st) { 703 st->print_cr("VM Arguments:"); 704 if (num_jvm_flags() > 0) { 705 st->print("jvm_flags: "); print_jvm_flags_on(st); 706 } 707 if (num_jvm_args() > 0) { 708 st->print("jvm_args: "); print_jvm_args_on(st); 709 } 710 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 711 st->print_cr("Launcher Type: %s", _sun_java_launcher); 712} 713 714void Arguments::print_jvm_flags_on(outputStream* st) { 715 if (_num_jvm_flags > 0) { 716 for (int i=0; i < _num_jvm_flags; i++) { 717 st->print("%s ", _jvm_flags_array[i]); 718 } 719 st->print_cr(""); 720 } 721} 722 723void Arguments::print_jvm_args_on(outputStream* st) { 724 if (_num_jvm_args > 0) { 725 for (int i=0; i < _num_jvm_args; i++) { 726 st->print("%s ", _jvm_args_array[i]); 727 } 728 st->print_cr(""); 729 } 730} 731 732bool Arguments::process_argument(const char* arg, 733 jboolean ignore_unrecognized, FlagValueOrigin origin) { 734 735 JDK_Version since = JDK_Version(); 736 737 if (parse_argument(arg, origin)) { 738 // do nothing 739 } else if (is_newly_obsolete(arg, &since)) { 740 enum { bufsize = 256 }; 741 char buffer[bufsize]; 742 since.to_string(buffer, bufsize); 743 jio_fprintf(defaultStream::error_stream(), 744 "Warning: The flag %s has been EOL'd as of %s and will" 745 " be ignored\n", arg, buffer); 746 } else { 747 if (!ignore_unrecognized) { 748 jio_fprintf(defaultStream::error_stream(), 749 "Unrecognized VM option '%s'\n", arg); 750 // allow for commandline "commenting out" options like -XX:#+Verbose 751 if (strlen(arg) == 0 || arg[0] != '#') { 752 return false; 753 } 754 } 755 } 756 return true; 757} 758 759bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 760 FILE* stream = fopen(file_name, "rb"); 761 if (stream == NULL) { 762 if (should_exist) { 763 jio_fprintf(defaultStream::error_stream(), 764 "Could not open settings file %s\n", file_name); 765 return false; 766 } else { 767 return true; 768 } 769 } 770 771 char token[1024]; 772 int pos = 0; 773 774 bool in_white_space = true; 775 bool in_comment = false; 776 bool in_quote = false; 777 char quote_c = 0; 778 bool result = true; 779 780 int c = getc(stream); 781 while(c != EOF) { 782 if (in_white_space) { 783 if (in_comment) { 784 if (c == '\n') in_comment = false; 785 } else { 786 if (c == '#') in_comment = true; 787 else if (!isspace(c)) { 788 in_white_space = false; 789 token[pos++] = c; 790 } 791 } 792 } else { 793 if (c == '\n' || (!in_quote && isspace(c))) { 794 // token ends at newline, or at unquoted whitespace 795 // this allows a way to include spaces in string-valued options 796 token[pos] = '\0'; 797 logOption(token); 798 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 799 build_jvm_flags(token); 800 pos = 0; 801 in_white_space = true; 802 in_quote = false; 803 } else if (!in_quote && (c == '\'' || c == '"')) { 804 in_quote = true; 805 quote_c = c; 806 } else if (in_quote && (c == quote_c)) { 807 in_quote = false; 808 } else { 809 token[pos++] = c; 810 } 811 } 812 c = getc(stream); 813 } 814 if (pos > 0) { 815 token[pos] = '\0'; 816 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 817 build_jvm_flags(token); 818 } 819 fclose(stream); 820 return result; 821} 822 823//============================================================================================================= 824// Parsing of properties (-D) 825 826const char* Arguments::get_property(const char* key) { 827 return PropertyList_get_value(system_properties(), key); 828} 829 830bool Arguments::add_property(const char* prop) { 831 const char* eq = strchr(prop, '='); 832 char* key; 833 // ns must be static--its address may be stored in a SystemProperty object. 834 const static char ns[1] = {0}; 835 char* value = (char *)ns; 836 837 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 838 key = AllocateHeap(key_len + 1, "add_property"); 839 strncpy(key, prop, key_len); 840 key[key_len] = '\0'; 841 842 if (eq != NULL) { 843 size_t value_len = strlen(prop) - key_len - 1; 844 value = AllocateHeap(value_len + 1, "add_property"); 845 strncpy(value, &prop[key_len + 1], value_len + 1); 846 } 847 848 if (strcmp(key, "java.compiler") == 0) { 849 process_java_compiler_argument(value); 850 FreeHeap(key); 851 if (eq != NULL) { 852 FreeHeap(value); 853 } 854 return true; 855 } 856 else if (strcmp(key, "sun.java.command") == 0) { 857 858 _java_command = value; 859 860 // don't add this property to the properties exposed to the java application 861 FreeHeap(key); 862 return true; 863 } 864 else if (strcmp(key, "sun.java.launcher.pid") == 0) { 865 // launcher.pid property is private and is processed 866 // in process_sun_java_launcher_properties(); 867 // the sun.java.launcher property is passed on to the java application 868 FreeHeap(key); 869 if (eq != NULL) { 870 FreeHeap(value); 871 } 872 return true; 873 } 874 else if (strcmp(key, "java.vendor.url.bug") == 0) { 875 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 876 // its value without going through the property list or making a Java call. 877 _java_vendor_url_bug = value; 878 } 879 880 // Create new property and add at the end of the list 881 PropertyList_unique_add(&_system_properties, key, value); 882 return true; 883} 884 885//=========================================================================================================== 886// Setting int/mixed/comp mode flags 887 888void Arguments::set_mode_flags(Mode mode) { 889 // Set up default values for all flags. 890 // If you add a flag to any of the branches below, 891 // add a default value for it here. 892 set_java_compiler(false); 893 _mode = mode; 894 895 // Ensure Agent_OnLoad has the correct initial values. 896 // This may not be the final mode; mode may change later in onload phase. 897 PropertyList_unique_add(&_system_properties, "java.vm.info", 898 (char*)Abstract_VM_Version::vm_info_string()); 899 900 UseInterpreter = true; 901 UseCompiler = true; 902 UseLoopCounter = true; 903 904 // Default values may be platform/compiler dependent - 905 // use the saved values 906 ClipInlining = Arguments::_ClipInlining; 907 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 908 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 909 BackgroundCompilation = Arguments::_BackgroundCompilation; 910 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold; 911 912 // Change from defaults based on mode 913 switch (mode) { 914 default: 915 ShouldNotReachHere(); 916 break; 917 case _int: 918 UseCompiler = false; 919 UseLoopCounter = false; 920 AlwaysCompileLoopMethods = false; 921 UseOnStackReplacement = false; 922 break; 923 case _mixed: 924 // same as default 925 break; 926 case _comp: 927 UseInterpreter = false; 928 BackgroundCompilation = false; 929 ClipInlining = false; 930 break; 931 } 932} 933 934// Conflict: required to use shared spaces (-Xshare:on), but 935// incompatible command line options were chosen. 936 937static void no_shared_spaces() { 938 if (RequireSharedSpaces) { 939 jio_fprintf(defaultStream::error_stream(), 940 "Class data sharing is inconsistent with other specified options.\n"); 941 vm_exit_during_initialization("Unable to use shared archive.", NULL); 942 } else { 943 FLAG_SET_DEFAULT(UseSharedSpaces, false); 944 } 945} 946 947// If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 948// if it's not explictly set or unset. If the user has chosen 949// UseParNewGC and not explicitly set ParallelGCThreads we 950// set it, unless this is a single cpu machine. 951void Arguments::set_parnew_gc_flags() { 952 assert(!UseSerialGC && !UseParallelGC && !UseG1GC, 953 "control point invariant"); 954 assert(UseParNewGC, "Error"); 955 956 // Turn off AdaptiveSizePolicy by default for parnew until it is 957 // complete. 958 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 959 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 960 } 961 962 if (ParallelGCThreads == 0) { 963 FLAG_SET_DEFAULT(ParallelGCThreads, 964 Abstract_VM_Version::parallel_worker_threads()); 965 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 966 FLAG_SET_DEFAULT(UseParNewGC, false); 967 } 968 } 969 if (!UseParNewGC) { 970 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 971 } else { 972 no_shared_spaces(); 973 974 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 correspondinly, 975 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 976 // we set them to 1024 and 1024. 977 // See CR 6362902. 978 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 979 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 980 } 981 if (FLAG_IS_DEFAULT(OldPLABSize)) { 982 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 983 } 984 985 // AlwaysTenure flag should make ParNew to promote all at first collection. 986 // See CR 6362902. 987 if (AlwaysTenure) { 988 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 989 } 990 } 991} 992 993// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 994// sparc/solaris for certain applications, but would gain from 995// further optimization and tuning efforts, and would almost 996// certainly gain from analysis of platform and environment. 997void Arguments::set_cms_and_parnew_gc_flags() { 998 assert(!UseSerialGC && !UseParallelGC, "Error"); 999 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1000 1001 // If we are using CMS, we prefer to UseParNewGC, 1002 // unless explicitly forbidden. 1003 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1004 FLAG_SET_ERGO(bool, UseParNewGC, true); 1005 } 1006 1007 // Turn off AdaptiveSizePolicy by default for cms until it is 1008 // complete. 1009 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1010 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1011 } 1012 1013 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1014 // as needed. 1015 if (UseParNewGC) { 1016 set_parnew_gc_flags(); 1017 } 1018 1019 // Now make adjustments for CMS 1020 size_t young_gen_per_worker; 1021 intx new_ratio; 1022 size_t min_new_default; 1023 intx tenuring_default; 1024 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0 1025 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) { 1026 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M); 1027 } 1028 young_gen_per_worker = 4*M; 1029 new_ratio = (intx)15; 1030 min_new_default = 4*M; 1031 tenuring_default = (intx)0; 1032 } else { // new defaults: "new" as of 6.0 1033 young_gen_per_worker = CMSYoungGenPerWorker; 1034 new_ratio = (intx)7; 1035 min_new_default = 16*M; 1036 tenuring_default = (intx)4; 1037 } 1038 1039 // Preferred young gen size for "short" pauses 1040 const uintx parallel_gc_threads = 1041 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1042 const size_t preferred_max_new_size_unaligned = 1043 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads); 1044 const size_t preferred_max_new_size = 1045 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1046 1047 // Unless explicitly requested otherwise, size young gen 1048 // for "short" pauses ~ 4M*ParallelGCThreads 1049 if (FLAG_IS_DEFAULT(MaxNewSize)) { // MaxNewSize not set at command-line 1050 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1051 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1052 } else { 1053 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1054 } 1055 if(PrintGCDetails && Verbose) { 1056 // Too early to use gclog_or_tty 1057 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1058 } 1059 } 1060 // Unless explicitly requested otherwise, prefer a large 1061 // Old to Young gen size so as to shift the collection load 1062 // to the old generation concurrent collector 1063 if (FLAG_IS_DEFAULT(NewRatio)) { 1064 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio)); 1065 1066 size_t min_new = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size()); 1067 size_t prev_initial_size = initial_heap_size(); 1068 if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) { 1069 set_initial_heap_size(min_new+OldSize); 1070 // Currently minimum size and the initial heap sizes are the same. 1071 set_min_heap_size(initial_heap_size()); 1072 if (PrintGCDetails && Verbose) { 1073 warning("Initial heap size increased to " SIZE_FORMAT " M from " 1074 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.", 1075 initial_heap_size()/M, prev_initial_size/M); 1076 } 1077 } 1078 // MaxHeapSize is aligned down in collectorPolicy 1079 size_t max_heap = align_size_down(MaxHeapSize, 1080 CardTableRS::ct_max_alignment_constraint()); 1081 1082 if(PrintGCDetails && Verbose) { 1083 // Too early to use gclog_or_tty 1084 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1085 " initial_heap_size: " SIZE_FORMAT 1086 " max_heap: " SIZE_FORMAT, 1087 min_heap_size(), initial_heap_size(), max_heap); 1088 } 1089 if (max_heap > min_new) { 1090 // Unless explicitly requested otherwise, make young gen 1091 // at least min_new, and at most preferred_max_new_size. 1092 if (FLAG_IS_DEFAULT(NewSize)) { 1093 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1094 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1095 if(PrintGCDetails && Verbose) { 1096 // Too early to use gclog_or_tty 1097 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize); 1098 } 1099 } 1100 // Unless explicitly requested otherwise, size old gen 1101 // so that it's at least 3X of NewSize to begin with; 1102 // later NewRatio will decide how it grows; see above. 1103 if (FLAG_IS_DEFAULT(OldSize)) { 1104 if (max_heap > NewSize) { 1105 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize)); 1106 if(PrintGCDetails && Verbose) { 1107 // Too early to use gclog_or_tty 1108 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize); 1109 } 1110 } 1111 } 1112 } 1113 } 1114 // Unless explicitly requested otherwise, definitely 1115 // promote all objects surviving "tenuring_default" scavenges. 1116 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1117 FLAG_IS_DEFAULT(SurvivorRatio)) { 1118 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1119 } 1120 // If we decided above (or user explicitly requested) 1121 // `promote all' (via MaxTenuringThreshold := 0), 1122 // prefer minuscule survivor spaces so as not to waste 1123 // space for (non-existent) survivors 1124 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1125 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1126 } 1127 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1128 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1129 // This is done in order to make ParNew+CMS configuration to work 1130 // with YoungPLABSize and OldPLABSize options. 1131 // See CR 6362902. 1132 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1133 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1134 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1135 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1136 // the value (either from the command line or ergonomics) of 1137 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1138 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1139 } 1140 else { 1141 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1142 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1143 // we'll let it to take precedence. 1144 jio_fprintf(defaultStream::error_stream(), 1145 "Both OldPLABSize and CMSParPromoteBlocksToClaim options are specified " 1146 "for the CMS collector. CMSParPromoteBlocksToClaim will take precedence.\n"); 1147 } 1148 } 1149} 1150 1151inline uintx max_heap_for_compressed_oops() { 1152 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1153 NOT_LP64(return DefaultMaxRAM); 1154} 1155 1156bool Arguments::should_auto_select_low_pause_collector() { 1157 if (UseAutoGCSelectPolicy && 1158 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1159 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1160 if (PrintGCDetails) { 1161 // Cannot use gclog_or_tty yet. 1162 tty->print_cr("Automatic selection of the low pause collector" 1163 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1164 } 1165 return true; 1166 } 1167 return false; 1168} 1169 1170void Arguments::set_ergonomics_flags() { 1171 // Parallel GC is not compatible with sharing. If one specifies 1172 // that they want sharing explicitly, do not set ergonmics flags. 1173 if (DumpSharedSpaces || ForceSharedSpaces) { 1174 return; 1175 } 1176 1177 if (os::is_server_class_machine() && !force_client_mode ) { 1178 // If no other collector is requested explicitly, 1179 // let the VM select the collector based on 1180 // machine class and automatic selection policy. 1181 if (!UseSerialGC && 1182 !UseConcMarkSweepGC && 1183 !UseG1GC && 1184 !UseParNewGC && 1185 !DumpSharedSpaces && 1186 FLAG_IS_DEFAULT(UseParallelGC)) { 1187 if (should_auto_select_low_pause_collector()) { 1188 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1189 } else { 1190 FLAG_SET_ERGO(bool, UseParallelGC, true); 1191 } 1192 no_shared_spaces(); 1193 } 1194 } 1195 1196#ifdef _LP64 1197 // Compressed Headers do not work with CMS, which uses a bit in the klass 1198 // field offset to determine free list chunk markers. 1199 // Check that UseCompressedOops can be set with the max heap size allocated 1200 // by ergonomics. 1201 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1202 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) { 1203 // Turn off until bug is fixed. 1204 // the following line to return it to default status. 1205 // FLAG_SET_ERGO(bool, UseCompressedOops, true); 1206 } else if (UseCompressedOops && UseG1GC) { 1207 warning(" UseCompressedOops does not currently work with UseG1GC; switching off UseCompressedOops. "); 1208 FLAG_SET_DEFAULT(UseCompressedOops, false); 1209 } 1210#ifdef _WIN64 1211 if (UseLargePages && UseCompressedOops) { 1212 // Cannot allocate guard pages for implicit checks in indexed addressing 1213 // mode, when large pages are specified on windows. 1214 FLAG_SET_DEFAULT(UseImplicitNullCheckForNarrowOop, false); 1215 } 1216#endif // _WIN64 1217 } else { 1218 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1219 warning("Max heap size too large for Compressed Oops"); 1220 FLAG_SET_DEFAULT(UseCompressedOops, false); 1221 } 1222 } 1223 // Also checks that certain machines are slower with compressed oops 1224 // in vm_version initialization code. 1225#endif // _LP64 1226} 1227 1228void Arguments::set_parallel_gc_flags() { 1229 assert(UseParallelGC || UseParallelOldGC, "Error"); 1230 // If parallel old was requested, automatically enable parallel scavenge. 1231 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) { 1232 FLAG_SET_DEFAULT(UseParallelGC, true); 1233 } 1234 1235 // If no heap maximum was requested explicitly, use some reasonable fraction 1236 // of the physical memory, up to a maximum of 1GB. 1237 if (UseParallelGC) { 1238 FLAG_SET_ERGO(uintx, ParallelGCThreads, 1239 Abstract_VM_Version::parallel_worker_threads()); 1240 1241 // PS is a server collector, setup the heap sizes accordingly. 1242 set_server_heap_size(); 1243 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1244 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1245 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1246 // See CR 6362902 for details. 1247 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1248 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1249 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1250 } 1251 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1252 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1253 } 1254 } 1255 1256 if (UseParallelOldGC) { 1257 // Par compact uses lower default values since they are treated as 1258 // minimums. These are different defaults because of the different 1259 // interpretation and are not ergonomically set. 1260 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1261 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1262 } 1263 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1264 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1265 } 1266 } 1267 } 1268} 1269 1270void Arguments::set_g1_gc_flags() { 1271 assert(UseG1GC, "Error"); 1272 // G1 is a server collector, setup the heap sizes accordingly. 1273 set_server_heap_size(); 1274#ifdef COMPILER1 1275 FastTLABRefill = false; 1276#endif 1277 FLAG_SET_DEFAULT(ParallelGCThreads, 1278 Abstract_VM_Version::parallel_worker_threads()); 1279 if (ParallelGCThreads == 0) { 1280 FLAG_SET_DEFAULT(ParallelGCThreads, 1281 Abstract_VM_Version::parallel_worker_threads 1282()); 1283 } 1284 no_shared_spaces(); 1285} 1286 1287void Arguments::set_server_heap_size() { 1288 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1289 const uint64_t reasonable_fraction = 1290 os::physical_memory() / DefaultMaxRAMFraction; 1291 const uint64_t maximum_size = (uint64_t) 1292 (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ? 1293 MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) : 1294 DefaultMaxRAM); 1295 size_t reasonable_max = 1296 (size_t) os::allocatable_physical_memory(reasonable_fraction); 1297 if (reasonable_max > maximum_size) { 1298 reasonable_max = maximum_size; 1299 } 1300 if (PrintGCDetails && Verbose) { 1301 // Cannot use gclog_or_tty yet. 1302 tty->print_cr(" Max heap size for server class platform " 1303 SIZE_FORMAT, reasonable_max); 1304 } 1305 // If the initial_heap_size has not been set with -Xms, 1306 // then set it as fraction of size of physical memory 1307 // respecting the maximum and minimum sizes of the heap. 1308 if (initial_heap_size() == 0) { 1309 const uint64_t reasonable_initial_fraction = 1310 os::physical_memory() / DefaultInitialRAMFraction; 1311 const size_t reasonable_initial = 1312 (size_t) os::allocatable_physical_memory(reasonable_initial_fraction); 1313 const size_t minimum_size = NewSize + OldSize; 1314 set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max), 1315 minimum_size)); 1316 // Currently the minimum size and the initial heap sizes are the same. 1317 set_min_heap_size(initial_heap_size()); 1318 if (PrintGCDetails && Verbose) { 1319 // Cannot use gclog_or_tty yet. 1320 tty->print_cr(" Initial heap size for server class platform " 1321 SIZE_FORMAT, initial_heap_size()); 1322 } 1323 } else { 1324 // A minimum size was specified on the command line. Be sure 1325 // that the maximum size is consistent. 1326 if (initial_heap_size() > reasonable_max) { 1327 reasonable_max = initial_heap_size(); 1328 } 1329 } 1330 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max); 1331 } 1332} 1333 1334// This must be called after ergonomics because we want bytecode rewriting 1335// if the server compiler is used, or if UseSharedSpaces is disabled. 1336void Arguments::set_bytecode_flags() { 1337 // Better not attempt to store into a read-only space. 1338 if (UseSharedSpaces) { 1339 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1340 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1341 } 1342 1343 if (!RewriteBytecodes) { 1344 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1345 } 1346} 1347 1348// Aggressive optimization flags -XX:+AggressiveOpts 1349void Arguments::set_aggressive_opts_flags() { 1350#ifdef COMPILER2 1351 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1352 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1353 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1354 } 1355 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1356 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1357 } 1358 1359 // Feed the cache size setting into the JDK 1360 char buffer[1024]; 1361 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1362 add_property(buffer); 1363 } 1364 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1365 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1366 } 1367 if (AggressiveOpts && FLAG_IS_DEFAULT(SpecialArraysEquals)) { 1368 FLAG_SET_DEFAULT(SpecialArraysEquals, true); 1369 } 1370 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1371 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1372 } 1373#endif 1374 1375 if (AggressiveOpts) { 1376// Sample flag setting code 1377// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1378// FLAG_SET_DEFAULT(EliminateZeroing, true); 1379// } 1380 } 1381} 1382 1383//=========================================================================================================== 1384// Parsing of java.compiler property 1385 1386void Arguments::process_java_compiler_argument(char* arg) { 1387 // For backwards compatibility, Djava.compiler=NONE or "" 1388 // causes us to switch to -Xint mode UNLESS -Xdebug 1389 // is also specified. 1390 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1391 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1392 } 1393} 1394 1395void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1396 _sun_java_launcher = strdup(launcher); 1397} 1398 1399bool Arguments::created_by_java_launcher() { 1400 assert(_sun_java_launcher != NULL, "property must have value"); 1401 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1402} 1403 1404//=========================================================================================================== 1405// Parsing of main arguments 1406 1407bool Arguments::verify_percentage(uintx value, const char* name) { 1408 if (value <= 100) { 1409 return true; 1410 } 1411 jio_fprintf(defaultStream::error_stream(), 1412 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1413 name, value); 1414 return false; 1415} 1416 1417static void set_serial_gc_flags() { 1418 FLAG_SET_DEFAULT(UseSerialGC, true); 1419 FLAG_SET_DEFAULT(UseParNewGC, false); 1420 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1421 FLAG_SET_DEFAULT(UseParallelGC, false); 1422 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1423 FLAG_SET_DEFAULT(UseG1GC, false); 1424} 1425 1426static bool verify_serial_gc_flags() { 1427 return (UseSerialGC && 1428 !(UseParNewGC || UseConcMarkSweepGC || UseG1GC || 1429 UseParallelGC || UseParallelOldGC)); 1430} 1431 1432// Check consistency of GC selection 1433bool Arguments::check_gc_consistency() { 1434 bool status = true; 1435 // Ensure that the user has not selected conflicting sets 1436 // of collectors. [Note: this check is merely a user convenience; 1437 // collectors over-ride each other so that only a non-conflicting 1438 // set is selected; however what the user gets is not what they 1439 // may have expected from the combination they asked for. It's 1440 // better to reduce user confusion by not allowing them to 1441 // select conflicting combinations. 1442 uint i = 0; 1443 if (UseSerialGC) i++; 1444 if (UseConcMarkSweepGC || UseParNewGC) i++; 1445 if (UseParallelGC || UseParallelOldGC) i++; 1446 if (i > 1) { 1447 jio_fprintf(defaultStream::error_stream(), 1448 "Conflicting collector combinations in option list; " 1449 "please refer to the release notes for the combinations " 1450 "allowed\n"); 1451 status = false; 1452 } 1453 1454 return status; 1455} 1456 1457// Check the consistency of vm_init_args 1458bool Arguments::check_vm_args_consistency() { 1459 // Method for adding checks for flag consistency. 1460 // The intent is to warn the user of all possible conflicts, 1461 // before returning an error. 1462 // Note: Needs platform-dependent factoring. 1463 bool status = true; 1464 1465#if ( (defined(COMPILER2) && defined(SPARC))) 1466 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1467 // on sparc doesn't require generation of a stub as is the case on, e.g., 1468 // x86. Normally, VM_Version_init must be called from init_globals in 1469 // init.cpp, which is called by the initial java thread *after* arguments 1470 // have been parsed. VM_Version_init gets called twice on sparc. 1471 extern void VM_Version_init(); 1472 VM_Version_init(); 1473 if (!VM_Version::has_v9()) { 1474 jio_fprintf(defaultStream::error_stream(), 1475 "V8 Machine detected, Server requires V9\n"); 1476 status = false; 1477 } 1478#endif /* COMPILER2 && SPARC */ 1479 1480 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1481 // builds so the cost of stack banging can be measured. 1482#if (defined(PRODUCT) && defined(SOLARIS)) 1483 if (!UseBoundThreads && !UseStackBanging) { 1484 jio_fprintf(defaultStream::error_stream(), 1485 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1486 1487 status = false; 1488 } 1489#endif 1490 1491 if (TLABRefillWasteFraction == 0) { 1492 jio_fprintf(defaultStream::error_stream(), 1493 "TLABRefillWasteFraction should be a denominator, " 1494 "not " SIZE_FORMAT "\n", 1495 TLABRefillWasteFraction); 1496 status = false; 1497 } 1498 1499 status = status && verify_percentage(MaxLiveObjectEvacuationRatio, 1500 "MaxLiveObjectEvacuationRatio"); 1501 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1502 "AdaptiveSizePolicyWeight"); 1503 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1504 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1505 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1506 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1507 1508 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1509 jio_fprintf(defaultStream::error_stream(), 1510 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1511 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1512 MinHeapFreeRatio, MaxHeapFreeRatio); 1513 status = false; 1514 } 1515 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1516 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1517 1518 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1519 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1520 } 1521 1522 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1523 // Settings to encourage splitting. 1524 if (!FLAG_IS_CMDLINE(NewRatio)) { 1525 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1526 } 1527 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1528 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1529 } 1530 } 1531 1532 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1533 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1534 if (GCTimeLimit == 100) { 1535 // Turn off gc-overhead-limit-exceeded checks 1536 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1537 } 1538 1539 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1540 1541 // Check user specified sharing option conflict with Parallel GC 1542 bool cannot_share = (UseConcMarkSweepGC || UseG1GC || UseParNewGC || 1543 UseParallelGC || UseParallelOldGC || 1544 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages)); 1545 1546 if (cannot_share) { 1547 // Either force sharing on by forcing the other options off, or 1548 // force sharing off. 1549 if (DumpSharedSpaces || ForceSharedSpaces) { 1550 set_serial_gc_flags(); 1551 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false); 1552 } else { 1553 no_shared_spaces(); 1554 } 1555 } 1556 1557 status = status && check_gc_consistency(); 1558 1559 if (_has_alloc_profile) { 1560 if (UseParallelGC || UseParallelOldGC) { 1561 jio_fprintf(defaultStream::error_stream(), 1562 "error: invalid argument combination.\n" 1563 "Allocation profiling (-Xaprof) cannot be used together with " 1564 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1565 status = false; 1566 } 1567 if (UseConcMarkSweepGC) { 1568 jio_fprintf(defaultStream::error_stream(), 1569 "error: invalid argument combination.\n" 1570 "Allocation profiling (-Xaprof) cannot be used together with " 1571 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1572 status = false; 1573 } 1574 } 1575 1576 if (CMSIncrementalMode) { 1577 if (!UseConcMarkSweepGC) { 1578 jio_fprintf(defaultStream::error_stream(), 1579 "error: invalid argument combination.\n" 1580 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1581 "selected in order\nto use CMSIncrementalMode.\n"); 1582 status = false; 1583 } else { 1584 status = status && verify_percentage(CMSIncrementalDutyCycle, 1585 "CMSIncrementalDutyCycle"); 1586 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1587 "CMSIncrementalDutyCycleMin"); 1588 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1589 "CMSIncrementalSafetyFactor"); 1590 status = status && verify_percentage(CMSIncrementalOffset, 1591 "CMSIncrementalOffset"); 1592 status = status && verify_percentage(CMSExpAvgFactor, 1593 "CMSExpAvgFactor"); 1594 // If it was not set on the command line, set 1595 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1596 if (CMSInitiatingOccupancyFraction < 0) { 1597 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1598 } 1599 } 1600 } 1601 1602 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1603 // insists that we hold the requisite locks so that the iteration is 1604 // MT-safe. For the verification at start-up and shut-down, we don't 1605 // yet have a good way of acquiring and releasing these locks, 1606 // which are not visible at the CollectedHeap level. We want to 1607 // be able to acquire these locks and then do the iteration rather 1608 // than just disable the lock verification. This will be fixed under 1609 // bug 4788986. 1610 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1611 if (VerifyGCStartAt == 0) { 1612 warning("Heap verification at start-up disabled " 1613 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1614 VerifyGCStartAt = 1; // Disable verification at start-up 1615 } 1616 if (VerifyBeforeExit) { 1617 warning("Heap verification at shutdown disabled " 1618 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1619 VerifyBeforeExit = false; // Disable verification at shutdown 1620 } 1621 } 1622 1623 // Note: only executed in non-PRODUCT mode 1624 if (!UseAsyncConcMarkSweepGC && 1625 (ExplicitGCInvokesConcurrent || 1626 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1627 jio_fprintf(defaultStream::error_stream(), 1628 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1629 " with -UseAsyncConcMarkSweepGC"); 1630 status = false; 1631 } 1632 1633 return status; 1634} 1635 1636bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1637 const char* option_type) { 1638 if (ignore) return false; 1639 1640 const char* spacer = " "; 1641 if (option_type == NULL) { 1642 option_type = ++spacer; // Set both to the empty string. 1643 } 1644 1645 if (os::obsolete_option(option)) { 1646 jio_fprintf(defaultStream::error_stream(), 1647 "Obsolete %s%soption: %s\n", option_type, spacer, 1648 option->optionString); 1649 return false; 1650 } else { 1651 jio_fprintf(defaultStream::error_stream(), 1652 "Unrecognized %s%soption: %s\n", option_type, spacer, 1653 option->optionString); 1654 return true; 1655 } 1656} 1657 1658static const char* user_assertion_options[] = { 1659 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1660}; 1661 1662static const char* system_assertion_options[] = { 1663 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1664}; 1665 1666// Return true if any of the strings in null-terminated array 'names' matches. 1667// If tail_allowed is true, then the tail must begin with a colon; otherwise, 1668// the option must match exactly. 1669static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 1670 bool tail_allowed) { 1671 for (/* empty */; *names != NULL; ++names) { 1672 if (match_option(option, *names, tail)) { 1673 if (**tail == '\0' || tail_allowed && **tail == ':') { 1674 return true; 1675 } 1676 } 1677 } 1678 return false; 1679} 1680 1681Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1682 julong* long_arg, 1683 julong min_size) { 1684 if (!atomull(s, long_arg)) return arg_unreadable; 1685 return check_memory_size(*long_arg, min_size); 1686} 1687 1688// Parse JavaVMInitArgs structure 1689 1690jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 1691 // For components of the system classpath. 1692 SysClassPath scp(Arguments::get_sysclasspath()); 1693 bool scp_assembly_required = false; 1694 1695 // Save default settings for some mode flags 1696 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1697 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1698 Arguments::_ClipInlining = ClipInlining; 1699 Arguments::_BackgroundCompilation = BackgroundCompilation; 1700 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold; 1701 1702 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 1703 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 1704 if (result != JNI_OK) { 1705 return result; 1706 } 1707 1708 // Parse JavaVMInitArgs structure passed in 1709 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 1710 if (result != JNI_OK) { 1711 return result; 1712 } 1713 1714 if (AggressiveOpts) { 1715 // Insert alt-rt.jar between user-specified bootclasspath 1716 // prefix and the default bootclasspath. os::set_boot_path() 1717 // uses meta_index_dir as the default bootclasspath directory. 1718 const char* altclasses_jar = "alt-rt.jar"; 1719 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 1720 strlen(altclasses_jar); 1721 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 1722 strcpy(altclasses_path, get_meta_index_dir()); 1723 strcat(altclasses_path, altclasses_jar); 1724 scp.add_suffix_to_prefix(altclasses_path); 1725 scp_assembly_required = true; 1726 FREE_C_HEAP_ARRAY(char, altclasses_path); 1727 } 1728 1729 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 1730 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 1731 if (result != JNI_OK) { 1732 return result; 1733 } 1734 1735 // Do final processing now that all arguments have been parsed 1736 result = finalize_vm_init_args(&scp, scp_assembly_required); 1737 if (result != JNI_OK) { 1738 return result; 1739 } 1740 1741 return JNI_OK; 1742} 1743 1744jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 1745 SysClassPath* scp_p, 1746 bool* scp_assembly_required_p, 1747 FlagValueOrigin origin) { 1748 // Remaining part of option string 1749 const char* tail; 1750 1751 // iterate over arguments 1752 for (int index = 0; index < args->nOptions; index++) { 1753 bool is_absolute_path = false; // for -agentpath vs -agentlib 1754 1755 const JavaVMOption* option = args->options + index; 1756 1757 if (!match_option(option, "-Djava.class.path", &tail) && 1758 !match_option(option, "-Dsun.java.command", &tail) && 1759 !match_option(option, "-Dsun.java.launcher", &tail)) { 1760 1761 // add all jvm options to the jvm_args string. This string 1762 // is used later to set the java.vm.args PerfData string constant. 1763 // the -Djava.class.path and the -Dsun.java.command options are 1764 // omitted from jvm_args string as each have their own PerfData 1765 // string constant object. 1766 build_jvm_args(option->optionString); 1767 } 1768 1769 // -verbose:[class/gc/jni] 1770 if (match_option(option, "-verbose", &tail)) { 1771 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 1772 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 1773 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 1774 } else if (!strcmp(tail, ":gc")) { 1775 FLAG_SET_CMDLINE(bool, PrintGC, true); 1776 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 1777 } else if (!strcmp(tail, ":jni")) { 1778 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 1779 } 1780 // -da / -ea / -disableassertions / -enableassertions 1781 // These accept an optional class/package name separated by a colon, e.g., 1782 // -da:java.lang.Thread. 1783 } else if (match_option(option, user_assertion_options, &tail, true)) { 1784 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 1785 if (*tail == '\0') { 1786 JavaAssertions::setUserClassDefault(enable); 1787 } else { 1788 assert(*tail == ':', "bogus match by match_option()"); 1789 JavaAssertions::addOption(tail + 1, enable); 1790 } 1791 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 1792 } else if (match_option(option, system_assertion_options, &tail, false)) { 1793 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 1794 JavaAssertions::setSystemClassDefault(enable); 1795 // -bootclasspath: 1796 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 1797 scp_p->reset_path(tail); 1798 *scp_assembly_required_p = true; 1799 // -bootclasspath/a: 1800 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 1801 scp_p->add_suffix(tail); 1802 *scp_assembly_required_p = true; 1803 // -bootclasspath/p: 1804 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 1805 scp_p->add_prefix(tail); 1806 *scp_assembly_required_p = true; 1807 // -Xrun 1808 } else if (match_option(option, "-Xrun", &tail)) { 1809 if (tail != NULL) { 1810 const char* pos = strchr(tail, ':'); 1811 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 1812 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 1813 name[len] = '\0'; 1814 1815 char *options = NULL; 1816 if(pos != NULL) { 1817 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 1818 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 1819 } 1820#ifdef JVMTI_KERNEL 1821 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 1822 warning("profiling and debugging agents are not supported with Kernel VM"); 1823 } else 1824#endif // JVMTI_KERNEL 1825 add_init_library(name, options); 1826 } 1827 // -agentlib and -agentpath 1828 } else if (match_option(option, "-agentlib:", &tail) || 1829 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 1830 if(tail != NULL) { 1831 const char* pos = strchr(tail, '='); 1832 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 1833 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 1834 name[len] = '\0'; 1835 1836 char *options = NULL; 1837 if(pos != NULL) { 1838 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 1839 } 1840#ifdef JVMTI_KERNEL 1841 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 1842 warning("profiling and debugging agents are not supported with Kernel VM"); 1843 } else 1844#endif // JVMTI_KERNEL 1845 add_init_agent(name, options, is_absolute_path); 1846 1847 } 1848 // -javaagent 1849 } else if (match_option(option, "-javaagent:", &tail)) { 1850 if(tail != NULL) { 1851 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 1852 add_init_agent("instrument", options, false); 1853 } 1854 // -Xnoclassgc 1855 } else if (match_option(option, "-Xnoclassgc", &tail)) { 1856 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 1857 // -Xincgc: i-CMS 1858 } else if (match_option(option, "-Xincgc", &tail)) { 1859 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 1860 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 1861 // -Xnoincgc: no i-CMS 1862 } else if (match_option(option, "-Xnoincgc", &tail)) { 1863 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 1864 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 1865 // -Xconcgc 1866 } else if (match_option(option, "-Xconcgc", &tail)) { 1867 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 1868 // -Xnoconcgc 1869 } else if (match_option(option, "-Xnoconcgc", &tail)) { 1870 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 1871 // -Xbatch 1872 } else if (match_option(option, "-Xbatch", &tail)) { 1873 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 1874 // -Xmn for compatibility with other JVM vendors 1875 } else if (match_option(option, "-Xmn", &tail)) { 1876 julong long_initial_eden_size = 0; 1877 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 1878 if (errcode != arg_in_range) { 1879 jio_fprintf(defaultStream::error_stream(), 1880 "Invalid initial eden size: %s\n", option->optionString); 1881 describe_range_error(errcode); 1882 return JNI_EINVAL; 1883 } 1884 FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size); 1885 FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size); 1886 // -Xms 1887 } else if (match_option(option, "-Xms", &tail)) { 1888 julong long_initial_heap_size = 0; 1889 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 1890 if (errcode != arg_in_range) { 1891 jio_fprintf(defaultStream::error_stream(), 1892 "Invalid initial heap size: %s\n", option->optionString); 1893 describe_range_error(errcode); 1894 return JNI_EINVAL; 1895 } 1896 set_initial_heap_size((size_t) long_initial_heap_size); 1897 // Currently the minimum size and the initial heap sizes are the same. 1898 set_min_heap_size(initial_heap_size()); 1899 // -Xmx 1900 } else if (match_option(option, "-Xmx", &tail)) { 1901 julong long_max_heap_size = 0; 1902 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 1903 if (errcode != arg_in_range) { 1904 jio_fprintf(defaultStream::error_stream(), 1905 "Invalid maximum heap size: %s\n", option->optionString); 1906 describe_range_error(errcode); 1907 return JNI_EINVAL; 1908 } 1909 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size); 1910 // Xmaxf 1911 } else if (match_option(option, "-Xmaxf", &tail)) { 1912 int maxf = (int)(atof(tail) * 100); 1913 if (maxf < 0 || maxf > 100) { 1914 jio_fprintf(defaultStream::error_stream(), 1915 "Bad max heap free percentage size: %s\n", 1916 option->optionString); 1917 return JNI_EINVAL; 1918 } else { 1919 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 1920 } 1921 // Xminf 1922 } else if (match_option(option, "-Xminf", &tail)) { 1923 int minf = (int)(atof(tail) * 100); 1924 if (minf < 0 || minf > 100) { 1925 jio_fprintf(defaultStream::error_stream(), 1926 "Bad min heap free percentage size: %s\n", 1927 option->optionString); 1928 return JNI_EINVAL; 1929 } else { 1930 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 1931 } 1932 // -Xss 1933 } else if (match_option(option, "-Xss", &tail)) { 1934 julong long_ThreadStackSize = 0; 1935 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 1936 if (errcode != arg_in_range) { 1937 jio_fprintf(defaultStream::error_stream(), 1938 "Invalid thread stack size: %s\n", option->optionString); 1939 describe_range_error(errcode); 1940 return JNI_EINVAL; 1941 } 1942 // Internally track ThreadStackSize in units of 1024 bytes. 1943 FLAG_SET_CMDLINE(intx, ThreadStackSize, 1944 round_to((int)long_ThreadStackSize, K) / K); 1945 // -Xoss 1946 } else if (match_option(option, "-Xoss", &tail)) { 1947 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 1948 // -Xmaxjitcodesize 1949 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) { 1950 julong long_ReservedCodeCacheSize = 0; 1951 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1952 (size_t)InitialCodeCacheSize); 1953 if (errcode != arg_in_range) { 1954 jio_fprintf(defaultStream::error_stream(), 1955 "Invalid maximum code cache size: %s\n", 1956 option->optionString); 1957 describe_range_error(errcode); 1958 return JNI_EINVAL; 1959 } 1960 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 1961 // -green 1962 } else if (match_option(option, "-green", &tail)) { 1963 jio_fprintf(defaultStream::error_stream(), 1964 "Green threads support not available\n"); 1965 return JNI_EINVAL; 1966 // -native 1967 } else if (match_option(option, "-native", &tail)) { 1968 // HotSpot always uses native threads, ignore silently for compatibility 1969 // -Xsqnopause 1970 } else if (match_option(option, "-Xsqnopause", &tail)) { 1971 // EVM option, ignore silently for compatibility 1972 // -Xrs 1973 } else if (match_option(option, "-Xrs", &tail)) { 1974 // Classic/EVM option, new functionality 1975 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 1976 } else if (match_option(option, "-Xusealtsigs", &tail)) { 1977 // change default internal VM signals used - lower case for back compat 1978 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 1979 // -Xoptimize 1980 } else if (match_option(option, "-Xoptimize", &tail)) { 1981 // EVM option, ignore silently for compatibility 1982 // -Xprof 1983 } else if (match_option(option, "-Xprof", &tail)) { 1984#ifndef FPROF_KERNEL 1985 _has_profile = true; 1986#else // FPROF_KERNEL 1987 // do we have to exit? 1988 warning("Kernel VM does not support flat profiling."); 1989#endif // FPROF_KERNEL 1990 // -Xaprof 1991 } else if (match_option(option, "-Xaprof", &tail)) { 1992 _has_alloc_profile = true; 1993 // -Xconcurrentio 1994 } else if (match_option(option, "-Xconcurrentio", &tail)) { 1995 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 1996 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 1997 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 1998 FLAG_SET_CMDLINE(bool, UseTLAB, false); 1999 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2000 2001 // -Xinternalversion 2002 } else if (match_option(option, "-Xinternalversion", &tail)) { 2003 jio_fprintf(defaultStream::output_stream(), "%s\n", 2004 VM_Version::internal_vm_info_string()); 2005 vm_exit(0); 2006#ifndef PRODUCT 2007 // -Xprintflags 2008 } else if (match_option(option, "-Xprintflags", &tail)) { 2009 CommandLineFlags::printFlags(); 2010 vm_exit(0); 2011#endif 2012 // -D 2013 } else if (match_option(option, "-D", &tail)) { 2014 if (!add_property(tail)) { 2015 return JNI_ENOMEM; 2016 } 2017 // Out of the box management support 2018 if (match_option(option, "-Dcom.sun.management", &tail)) { 2019 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2020 } 2021 // -Xint 2022 } else if (match_option(option, "-Xint", &tail)) { 2023 set_mode_flags(_int); 2024 // -Xmixed 2025 } else if (match_option(option, "-Xmixed", &tail)) { 2026 set_mode_flags(_mixed); 2027 // -Xcomp 2028 } else if (match_option(option, "-Xcomp", &tail)) { 2029 // for testing the compiler; turn off all flags that inhibit compilation 2030 set_mode_flags(_comp); 2031 2032 // -Xshare:dump 2033 } else if (match_option(option, "-Xshare:dump", &tail)) { 2034#ifdef TIERED 2035 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2036 set_mode_flags(_int); // Prevent compilation, which creates objects 2037#elif defined(COMPILER2) 2038 vm_exit_during_initialization( 2039 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2040#elif defined(KERNEL) 2041 vm_exit_during_initialization( 2042 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2043#else 2044 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2045 set_mode_flags(_int); // Prevent compilation, which creates objects 2046#endif 2047 // -Xshare:on 2048 } else if (match_option(option, "-Xshare:on", &tail)) { 2049 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2050 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2051#ifdef TIERED 2052 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true); 2053#endif // TIERED 2054 // -Xshare:auto 2055 } else if (match_option(option, "-Xshare:auto", &tail)) { 2056 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2057 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2058 // -Xshare:off 2059 } else if (match_option(option, "-Xshare:off", &tail)) { 2060 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2061 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2062 2063 // -Xverify 2064 } else if (match_option(option, "-Xverify", &tail)) { 2065 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2066 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2067 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2068 } else if (strcmp(tail, ":remote") == 0) { 2069 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2070 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2071 } else if (strcmp(tail, ":none") == 0) { 2072 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2073 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2074 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2075 return JNI_EINVAL; 2076 } 2077 // -Xdebug 2078 } else if (match_option(option, "-Xdebug", &tail)) { 2079 // note this flag has been used, then ignore 2080 set_xdebug_mode(true); 2081 // -Xnoagent 2082 } else if (match_option(option, "-Xnoagent", &tail)) { 2083 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2084 } else if (match_option(option, "-Xboundthreads", &tail)) { 2085 // Bind user level threads to kernel threads (Solaris only) 2086 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2087 } else if (match_option(option, "-Xloggc:", &tail)) { 2088 // Redirect GC output to the file. -Xloggc:<filename> 2089 // ostream_init_log(), when called will use this filename 2090 // to initialize a fileStream. 2091 _gc_log_filename = strdup(tail); 2092 FLAG_SET_CMDLINE(bool, PrintGC, true); 2093 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2094 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2095 2096 // JNI hooks 2097 } else if (match_option(option, "-Xcheck", &tail)) { 2098 if (!strcmp(tail, ":jni")) { 2099 CheckJNICalls = true; 2100 } else if (is_bad_option(option, args->ignoreUnrecognized, 2101 "check")) { 2102 return JNI_EINVAL; 2103 } 2104 } else if (match_option(option, "vfprintf", &tail)) { 2105 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2106 } else if (match_option(option, "exit", &tail)) { 2107 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2108 } else if (match_option(option, "abort", &tail)) { 2109 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2110 // -XX:+AggressiveHeap 2111 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2112 2113 // This option inspects the machine and attempts to set various 2114 // parameters to be optimal for long-running, memory allocation 2115 // intensive jobs. It is intended for machines with large 2116 // amounts of cpu and memory. 2117 2118 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2119 // VM, but we may not be able to represent the total physical memory 2120 // available (like having 8gb of memory on a box but using a 32bit VM). 2121 // Thus, we need to make sure we're using a julong for intermediate 2122 // calculations. 2123 julong initHeapSize; 2124 julong total_memory = os::physical_memory(); 2125 2126 if (total_memory < (julong)256*M) { 2127 jio_fprintf(defaultStream::error_stream(), 2128 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2129 vm_exit(1); 2130 } 2131 2132 // The heap size is half of available memory, or (at most) 2133 // all of possible memory less 160mb (leaving room for the OS 2134 // when using ISM). This is the maximum; because adaptive sizing 2135 // is turned on below, the actual space used may be smaller. 2136 2137 initHeapSize = MIN2(total_memory / (julong)2, 2138 total_memory - (julong)160*M); 2139 2140 // Make sure that if we have a lot of memory we cap the 32 bit 2141 // process space. The 64bit VM version of this function is a nop. 2142 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2143 2144 // The perm gen is separate but contiguous with the 2145 // object heap (and is reserved with it) so subtract it 2146 // from the heap size. 2147 if (initHeapSize > MaxPermSize) { 2148 initHeapSize = initHeapSize - MaxPermSize; 2149 } else { 2150 warning("AggressiveHeap and MaxPermSize values may conflict"); 2151 } 2152 2153 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2154 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2155 set_initial_heap_size(MaxHeapSize); 2156 // Currently the minimum size and the initial heap sizes are the same. 2157 set_min_heap_size(initial_heap_size()); 2158 } 2159 if (FLAG_IS_DEFAULT(NewSize)) { 2160 // Make the young generation 3/8ths of the total heap. 2161 FLAG_SET_CMDLINE(uintx, NewSize, 2162 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2163 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2164 } 2165 2166 FLAG_SET_DEFAULT(UseLargePages, true); 2167 2168 // Increase some data structure sizes for efficiency 2169 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2170 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2171 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2172 2173 // See the OldPLABSize comment below, but replace 'after promotion' 2174 // with 'after copying'. YoungPLABSize is the size of the survivor 2175 // space per-gc-thread buffers. The default is 4kw. 2176 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2177 2178 // OldPLABSize is the size of the buffers in the old gen that 2179 // UseParallelGC uses to promote live data that doesn't fit in the 2180 // survivor spaces. At any given time, there's one for each gc thread. 2181 // The default size is 1kw. These buffers are rarely used, since the 2182 // survivor spaces are usually big enough. For specjbb, however, there 2183 // are occasions when there's lots of live data in the young gen 2184 // and we end up promoting some of it. We don't have a definite 2185 // explanation for why bumping OldPLABSize helps, but the theory 2186 // is that a bigger PLAB results in retaining something like the 2187 // original allocation order after promotion, which improves mutator 2188 // locality. A minor effect may be that larger PLABs reduce the 2189 // number of PLAB allocation events during gc. The value of 8kw 2190 // was arrived at by experimenting with specjbb. 2191 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2192 2193 // CompilationPolicyChoice=0 causes the server compiler to adopt 2194 // a more conservative which-method-do-I-compile policy when one 2195 // of the counters maintained by the interpreter trips. The 2196 // result is reduced startup time and improved specjbb and 2197 // alacrity performance. Zero is the default, but we set it 2198 // explicitly here in case the default changes. 2199 // See runtime/compilationPolicy.*. 2200 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2201 2202 // Enable parallel GC and adaptive generation sizing 2203 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2204 FLAG_SET_DEFAULT(ParallelGCThreads, 2205 Abstract_VM_Version::parallel_worker_threads()); 2206 2207 // Encourage steady state memory management 2208 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2209 2210 // This appears to improve mutator locality 2211 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2212 2213 // Get around early Solaris scheduling bug 2214 // (affinity vs other jobs on system) 2215 // but disallow DR and offlining (5008695). 2216 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2217 2218 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2219 // The last option must always win. 2220 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2221 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2222 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2223 // The last option must always win. 2224 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2225 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2226 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2227 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2228 jio_fprintf(defaultStream::error_stream(), 2229 "Please use CMSClassUnloadingEnabled in place of " 2230 "CMSPermGenSweepingEnabled in the future\n"); 2231 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2232 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2233 jio_fprintf(defaultStream::error_stream(), 2234 "Please use -XX:+UseGCOverheadLimit in place of " 2235 "-XX:+UseGCTimeLimit in the future\n"); 2236 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2237 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2238 jio_fprintf(defaultStream::error_stream(), 2239 "Please use -XX:-UseGCOverheadLimit in place of " 2240 "-XX:-UseGCTimeLimit in the future\n"); 2241 // The TLE options are for compatibility with 1.3 and will be 2242 // removed without notice in a future release. These options 2243 // are not to be documented. 2244 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2245 // No longer used. 2246 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2247 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2248 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2249 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2250 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2251 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2252 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2253 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2254 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2255 // No longer used. 2256 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2257 julong long_tlab_size = 0; 2258 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2259 if (errcode != arg_in_range) { 2260 jio_fprintf(defaultStream::error_stream(), 2261 "Invalid TLAB size: %s\n", option->optionString); 2262 describe_range_error(errcode); 2263 return JNI_EINVAL; 2264 } 2265 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2266 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2267 // No longer used. 2268 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2269 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2270 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2271 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2272SOLARIS_ONLY( 2273 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2274 warning("-XX:+UsePermISM is obsolete."); 2275 FLAG_SET_CMDLINE(bool, UseISM, true); 2276 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2277 FLAG_SET_CMDLINE(bool, UseISM, false); 2278) 2279 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2280 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2281 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2282 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2283 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2284 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2285 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2286#ifdef SOLARIS 2287 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2288 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2289 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2290 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2291#else // ndef SOLARIS 2292 jio_fprintf(defaultStream::error_stream(), 2293 "ExtendedDTraceProbes flag is only applicable on Solaris\n"); 2294 return JNI_EINVAL; 2295#endif // ndef SOLARIS 2296 } else 2297#ifdef ASSERT 2298 if (match_option(option, "-XX:+FullGCALot", &tail)) { 2299 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2300 // disable scavenge before parallel mark-compact 2301 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2302 } else 2303#endif 2304 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2305 julong cms_blocks_to_claim = (julong)atol(tail); 2306 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2307 jio_fprintf(defaultStream::error_stream(), 2308 "Please use -XX:CMSParPromoteBlocksToClaim in place of " 2309 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2310 } else 2311 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2312 julong old_plab_size = 0; 2313 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2314 if (errcode != arg_in_range) { 2315 jio_fprintf(defaultStream::error_stream(), 2316 "Invalid old PLAB size: %s\n", option->optionString); 2317 describe_range_error(errcode); 2318 return JNI_EINVAL; 2319 } 2320 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2321 jio_fprintf(defaultStream::error_stream(), 2322 "Please use -XX:OldPLABSize in place of " 2323 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2324 } else 2325 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2326 julong young_plab_size = 0; 2327 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2328 if (errcode != arg_in_range) { 2329 jio_fprintf(defaultStream::error_stream(), 2330 "Invalid young PLAB size: %s\n", option->optionString); 2331 describe_range_error(errcode); 2332 return JNI_EINVAL; 2333 } 2334 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2335 jio_fprintf(defaultStream::error_stream(), 2336 "Please use -XX:YoungPLABSize in place of " 2337 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2338 } else 2339 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2340 // Skip -XX:Flags= since that case has already been handled 2341 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2342 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2343 return JNI_EINVAL; 2344 } 2345 } 2346 // Unknown option 2347 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2348 return JNI_ERR; 2349 } 2350 } 2351 // Change the default value for flags which have different default values 2352 // when working with older JDKs. 2353 if (JDK_Version::current().compare_major(6) <= 0 && 2354 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2355 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2356 } 2357 return JNI_OK; 2358} 2359 2360jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2361 // This must be done after all -D arguments have been processed. 2362 scp_p->expand_endorsed(); 2363 2364 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2365 // Assemble the bootclasspath elements into the final path. 2366 Arguments::set_sysclasspath(scp_p->combined_path()); 2367 } 2368 2369 // This must be done after all arguments have been processed. 2370 // java_compiler() true means set to "NONE" or empty. 2371 if (java_compiler() && !xdebug_mode()) { 2372 // For backwards compatibility, we switch to interpreted mode if 2373 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2374 // not specified. 2375 set_mode_flags(_int); 2376 } 2377 if (CompileThreshold == 0) { 2378 set_mode_flags(_int); 2379 } 2380 2381#ifdef TIERED 2382 // If we are using tiered compilation in the tiered vm then c1 will 2383 // do the profiling and we don't want to waste that time in the 2384 // interpreter. 2385 if (TieredCompilation) { 2386 ProfileInterpreter = false; 2387 } else { 2388 // Since we are running vanilla server we must adjust the compile threshold 2389 // unless the user has already adjusted it because the default threshold assumes 2390 // we will run tiered. 2391 2392 if (FLAG_IS_DEFAULT(CompileThreshold)) { 2393 CompileThreshold = Tier2CompileThreshold; 2394 } 2395 } 2396#endif // TIERED 2397 2398#ifndef COMPILER2 2399 // Don't degrade server performance for footprint 2400 if (FLAG_IS_DEFAULT(UseLargePages) && 2401 MaxHeapSize < LargePageHeapSizeThreshold) { 2402 // No need for large granularity pages w/small heaps. 2403 // Note that large pages are enabled/disabled for both the 2404 // Java heap and the code cache. 2405 FLAG_SET_DEFAULT(UseLargePages, false); 2406 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2407 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2408 } 2409 2410#else 2411 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2412 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2413 } 2414 // Temporary disable bulk zeroing reduction with G1. See CR 6627983. 2415 if (UseG1GC) { 2416 FLAG_SET_DEFAULT(ReduceBulkZeroing, false); 2417 } 2418#endif 2419 2420 if (!check_vm_args_consistency()) { 2421 return JNI_ERR; 2422 } 2423 2424 return JNI_OK; 2425} 2426 2427jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2428 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2429 scp_assembly_required_p); 2430} 2431 2432jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2433 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2434 scp_assembly_required_p); 2435} 2436 2437jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2438 const int N_MAX_OPTIONS = 64; 2439 const int OPTION_BUFFER_SIZE = 1024; 2440 char buffer[OPTION_BUFFER_SIZE]; 2441 2442 // The variable will be ignored if it exceeds the length of the buffer. 2443 // Don't check this variable if user has special privileges 2444 // (e.g. unix su command). 2445 if (os::getenv(name, buffer, sizeof(buffer)) && 2446 !os::have_special_privileges()) { 2447 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2448 jio_fprintf(defaultStream::error_stream(), 2449 "Picked up %s: %s\n", name, buffer); 2450 char* rd = buffer; // pointer to the input string (rd) 2451 int i; 2452 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2453 while (isspace(*rd)) rd++; // skip whitespace 2454 if (*rd == 0) break; // we re done when the input string is read completely 2455 2456 // The output, option string, overwrites the input string. 2457 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2458 // input string (rd). 2459 char* wrt = rd; 2460 2461 options[i++].optionString = wrt; // Fill in option 2462 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2463 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2464 int quote = *rd; // matching quote to look for 2465 rd++; // don't copy open quote 2466 while (*rd != quote) { // include everything (even spaces) up until quote 2467 if (*rd == 0) { // string termination means unmatched string 2468 jio_fprintf(defaultStream::error_stream(), 2469 "Unmatched quote in %s\n", name); 2470 return JNI_ERR; 2471 } 2472 *wrt++ = *rd++; // copy to option string 2473 } 2474 rd++; // don't copy close quote 2475 } else { 2476 *wrt++ = *rd++; // copy to option string 2477 } 2478 } 2479 // Need to check if we're done before writing a NULL, 2480 // because the write could be to the byte that rd is pointing to. 2481 if (*rd++ == 0) { 2482 *wrt = 0; 2483 break; 2484 } 2485 *wrt = 0; // Zero terminate option 2486 } 2487 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2488 JavaVMInitArgs vm_args; 2489 vm_args.version = JNI_VERSION_1_2; 2490 vm_args.options = options; 2491 vm_args.nOptions = i; 2492 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2493 2494 if (PrintVMOptions) { 2495 const char* tail; 2496 for (int i = 0; i < vm_args.nOptions; i++) { 2497 const JavaVMOption *option = vm_args.options + i; 2498 if (match_option(option, "-XX:", &tail)) { 2499 logOption(tail); 2500 } 2501 } 2502 } 2503 2504 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2505 } 2506 return JNI_OK; 2507} 2508 2509// Parse entry point called from JNI_CreateJavaVM 2510 2511jint Arguments::parse(const JavaVMInitArgs* args) { 2512 2513 // Sharing support 2514 // Construct the path to the archive 2515 char jvm_path[JVM_MAXPATHLEN]; 2516 os::jvm_path(jvm_path, sizeof(jvm_path)); 2517#ifdef TIERED 2518 if (strstr(jvm_path, "client") != NULL) { 2519 force_client_mode = true; 2520 } 2521#endif // TIERED 2522 char *end = strrchr(jvm_path, *os::file_separator()); 2523 if (end != NULL) *end = '\0'; 2524 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2525 strlen(os::file_separator()) + 20); 2526 if (shared_archive_path == NULL) return JNI_ENOMEM; 2527 strcpy(shared_archive_path, jvm_path); 2528 strcat(shared_archive_path, os::file_separator()); 2529 strcat(shared_archive_path, "classes"); 2530 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2531 strcat(shared_archive_path, ".jsa"); 2532 SharedArchivePath = shared_archive_path; 2533 2534 // Remaining part of option string 2535 const char* tail; 2536 2537 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2538 bool settings_file_specified = false; 2539 const char* flags_file; 2540 int index; 2541 for (index = 0; index < args->nOptions; index++) { 2542 const JavaVMOption *option = args->options + index; 2543 if (match_option(option, "-XX:Flags=", &tail)) { 2544 flags_file = tail; 2545 settings_file_specified = true; 2546 } 2547 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2548 PrintVMOptions = true; 2549 } 2550 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2551 PrintVMOptions = false; 2552 } 2553 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2554 IgnoreUnrecognizedVMOptions = true; 2555 } 2556 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2557 IgnoreUnrecognizedVMOptions = false; 2558 } 2559 } 2560 2561 if (IgnoreUnrecognizedVMOptions) { 2562 // uncast const to modify the flag args->ignoreUnrecognized 2563 *(jboolean*)(&args->ignoreUnrecognized) = true; 2564 } 2565 2566 // Parse specified settings file 2567 if (settings_file_specified) { 2568 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 2569 return JNI_EINVAL; 2570 } 2571 } 2572 2573 // Parse default .hotspotrc settings file 2574 if (!settings_file_specified) { 2575 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 2576 return JNI_EINVAL; 2577 } 2578 } 2579 2580 if (PrintVMOptions) { 2581 for (index = 0; index < args->nOptions; index++) { 2582 const JavaVMOption *option = args->options + index; 2583 if (match_option(option, "-XX:", &tail)) { 2584 logOption(tail); 2585 } 2586 } 2587 } 2588 2589 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 2590 jint result = parse_vm_init_args(args); 2591 if (result != JNI_OK) { 2592 return result; 2593 } 2594 2595 // These are hacks until G1 is fully supported and tested 2596 // but lets you force -XX:+UseG1GC in PRT and get it where it (mostly) works 2597 if (UseG1GC) { 2598 if (UseConcMarkSweepGC || UseParNewGC || UseParallelGC || UseParallelOldGC || UseSerialGC) { 2599#ifndef PRODUCT 2600 tty->print_cr("-XX:+UseG1GC is incompatible with other collectors, using UseG1GC"); 2601#endif // PRODUCT 2602 UseConcMarkSweepGC = false; 2603 UseParNewGC = false; 2604 UseParallelGC = false; 2605 UseParallelOldGC = false; 2606 UseSerialGC = false; 2607 } 2608 no_shared_spaces(); 2609 } 2610 2611#ifndef PRODUCT 2612 if (TraceBytecodesAt != 0) { 2613 TraceBytecodes = true; 2614 } 2615 if (CountCompiledCalls) { 2616 if (UseCounterDecay) { 2617 warning("UseCounterDecay disabled because CountCalls is set"); 2618 UseCounterDecay = false; 2619 } 2620 } 2621#endif // PRODUCT 2622 2623 if (PrintGCDetails) { 2624 // Turn on -verbose:gc options as well 2625 PrintGC = true; 2626 if (FLAG_IS_DEFAULT(TraceClassUnloading)) { 2627 TraceClassUnloading = true; 2628 } 2629 } 2630 2631#ifdef SERIALGC 2632 set_serial_gc_flags(); 2633#endif // SERIALGC 2634#ifdef KERNEL 2635 no_shared_spaces(); 2636#endif // KERNEL 2637 2638 // Set flags based on ergonomics. 2639 set_ergonomics_flags(); 2640 2641 // Check the GC selections again. 2642 if (!check_gc_consistency()) { 2643 return JNI_EINVAL; 2644 } 2645 2646 if (UseParallelGC || UseParallelOldGC) { 2647 // Set some flags for ParallelGC if needed. 2648 set_parallel_gc_flags(); 2649 } else if (UseConcMarkSweepGC) { 2650 // Set some flags for CMS 2651 set_cms_and_parnew_gc_flags(); 2652 } else if (UseParNewGC) { 2653 // Set some flags for ParNew 2654 set_parnew_gc_flags(); 2655 } 2656 // Temporary; make the "if" an "else-if" before 2657 // we integrate G1. XXX 2658 if (UseG1GC) { 2659 // Set some flags for garbage-first, if needed. 2660 set_g1_gc_flags(); 2661 } 2662 2663#ifdef SERIALGC 2664 assert(verify_serial_gc_flags(), "SerialGC unset"); 2665#endif // SERIALGC 2666 2667 // Set bytecode rewriting flags 2668 set_bytecode_flags(); 2669 2670 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 2671 set_aggressive_opts_flags(); 2672 2673#ifdef CC_INTERP 2674 // Biased locking is not implemented with c++ interpreter 2675 FLAG_SET_DEFAULT(UseBiasedLocking, false); 2676#endif /* CC_INTERP */ 2677 2678#ifdef COMPILER2 2679 if (!UseBiasedLocking || EmitSync != 0) { 2680 UseOptoBiasInlining = false; 2681 } 2682#endif 2683 2684 if (PrintCommandLineFlags) { 2685 CommandLineFlags::printSetFlags(); 2686 } 2687 2688#ifdef ASSERT 2689 if (PrintFlagsFinal) { 2690 CommandLineFlags::printFlags(); 2691 } 2692#endif 2693 2694 return JNI_OK; 2695} 2696 2697int Arguments::PropertyList_count(SystemProperty* pl) { 2698 int count = 0; 2699 while(pl != NULL) { 2700 count++; 2701 pl = pl->next(); 2702 } 2703 return count; 2704} 2705 2706const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 2707 assert(key != NULL, "just checking"); 2708 SystemProperty* prop; 2709 for (prop = pl; prop != NULL; prop = prop->next()) { 2710 if (strcmp(key, prop->key()) == 0) return prop->value(); 2711 } 2712 return NULL; 2713} 2714 2715const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 2716 int count = 0; 2717 const char* ret_val = NULL; 2718 2719 while(pl != NULL) { 2720 if(count >= index) { 2721 ret_val = pl->key(); 2722 break; 2723 } 2724 count++; 2725 pl = pl->next(); 2726 } 2727 2728 return ret_val; 2729} 2730 2731char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 2732 int count = 0; 2733 char* ret_val = NULL; 2734 2735 while(pl != NULL) { 2736 if(count >= index) { 2737 ret_val = pl->value(); 2738 break; 2739 } 2740 count++; 2741 pl = pl->next(); 2742 } 2743 2744 return ret_val; 2745} 2746 2747void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 2748 SystemProperty* p = *plist; 2749 if (p == NULL) { 2750 *plist = new_p; 2751 } else { 2752 while (p->next() != NULL) { 2753 p = p->next(); 2754 } 2755 p->set_next(new_p); 2756 } 2757} 2758 2759void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 2760 if (plist == NULL) 2761 return; 2762 2763 SystemProperty* new_p = new SystemProperty(k, v, true); 2764 PropertyList_add(plist, new_p); 2765} 2766 2767// This add maintains unique property key in the list. 2768void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v) { 2769 if (plist == NULL) 2770 return; 2771 2772 // If property key exist then update with new value. 2773 SystemProperty* prop; 2774 for (prop = *plist; prop != NULL; prop = prop->next()) { 2775 if (strcmp(k, prop->key()) == 0) { 2776 prop->set_value(v); 2777 return; 2778 } 2779 } 2780 2781 PropertyList_add(plist, k, v); 2782} 2783 2784#ifdef KERNEL 2785char *Arguments::get_kernel_properties() { 2786 // Find properties starting with kernel and append them to string 2787 // We need to find out how long they are first because the URL's that they 2788 // might point to could get long. 2789 int length = 0; 2790 SystemProperty* prop; 2791 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 2792 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 2793 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 2794 } 2795 } 2796 // Add one for null terminator. 2797 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 2798 if (length != 0) { 2799 int pos = 0; 2800 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 2801 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 2802 jio_snprintf(&props[pos], length-pos, 2803 "-D%s=%s ", prop->key(), prop->value()); 2804 pos = strlen(props); 2805 } 2806 } 2807 } 2808 // null terminate props in case of null 2809 props[length] = '\0'; 2810 return props; 2811} 2812#endif // KERNEL 2813 2814// Copies src into buf, replacing "%%" with "%" and "%p" with pid 2815// Returns true if all of the source pointed by src has been copied over to 2816// the destination buffer pointed by buf. Otherwise, returns false. 2817// Notes: 2818// 1. If the length (buflen) of the destination buffer excluding the 2819// NULL terminator character is not long enough for holding the expanded 2820// pid characters, it also returns false instead of returning the partially 2821// expanded one. 2822// 2. The passed in "buflen" should be large enough to hold the null terminator. 2823bool Arguments::copy_expand_pid(const char* src, size_t srclen, 2824 char* buf, size_t buflen) { 2825 const char* p = src; 2826 char* b = buf; 2827 const char* src_end = &src[srclen]; 2828 char* buf_end = &buf[buflen - 1]; 2829 2830 while (p < src_end && b < buf_end) { 2831 if (*p == '%') { 2832 switch (*(++p)) { 2833 case '%': // "%%" ==> "%" 2834 *b++ = *p++; 2835 break; 2836 case 'p': { // "%p" ==> current process id 2837 // buf_end points to the character before the last character so 2838 // that we could write '\0' to the end of the buffer. 2839 size_t buf_sz = buf_end - b + 1; 2840 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 2841 2842 // if jio_snprintf fails or the buffer is not long enough to hold 2843 // the expanded pid, returns false. 2844 if (ret < 0 || ret >= (int)buf_sz) { 2845 return false; 2846 } else { 2847 b += ret; 2848 assert(*b == '\0', "fail in copy_expand_pid"); 2849 if (p == src_end && b == buf_end + 1) { 2850 // reach the end of the buffer. 2851 return true; 2852 } 2853 } 2854 p++; 2855 break; 2856 } 2857 default : 2858 *b++ = '%'; 2859 } 2860 } else { 2861 *b++ = *p++; 2862 } 2863 } 2864 *b = '\0'; 2865 return (p == src_end); // return false if not all of the source was copied 2866} 2867