1 /* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "compiler/compilerOracle.hpp" 28 #include "memory/allocation.inline.hpp" 29 #include "memory/cardTableRS.hpp" 30 #include "memory/referenceProcessor.hpp" 31 #include "memory/universe.inline.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "prims/jvmtiExport.hpp" 34 #include "runtime/arguments.hpp" 35 #include "runtime/globals_extension.hpp" 36 #include "runtime/java.hpp" 37 #include "services/management.hpp" 38 #include "utilities/defaultStream.hpp" 39 #include "utilities/taskqueue.hpp" 40 #ifdef TARGET_OS_FAMILY_linux 41 # include "os_linux.inline.hpp" 42 #endif 43 #ifdef TARGET_OS_FAMILY_solaris 44 # include "os_solaris.inline.hpp" 45 #endif 46 #ifdef TARGET_OS_FAMILY_windows 47 # include "os_windows.inline.hpp" 48 #endif 49 #ifdef TARGET_OS_FAMILY_bsd 50 # include "os_bsd.inline.hpp" 51 #endif 52 #ifndef SERIALGC 53 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 54 #endif 55 56 // Note: This is a special bug reporting site for the JVM 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 58 #define DEFAULT_JAVA_LAUNCHER "generic" 59 60 char** Arguments::_jvm_flags_array = NULL; 61 int Arguments::_num_jvm_flags = 0; 62 char** Arguments::_jvm_args_array = NULL; 63 int Arguments::_num_jvm_args = 0; 64 char* Arguments::_java_command = NULL; 65 SystemProperty* Arguments::_system_properties = NULL; 66 const char* Arguments::_gc_log_filename = NULL; 67 bool Arguments::_has_profile = false; 68 bool Arguments::_has_alloc_profile = false; 69 uintx Arguments::_min_heap_size = 0; 70 Arguments::Mode Arguments::_mode = _mixed; 71 bool Arguments::_java_compiler = false; 72 bool Arguments::_xdebug_mode = false; 73 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 74 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 75 int Arguments::_sun_java_launcher_pid = -1; 76 bool Arguments::_created_by_gamma_launcher = false; 77 78 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 79 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 80 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 81 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 82 bool Arguments::_ClipInlining = ClipInlining; 83 84 char* Arguments::SharedArchivePath = NULL; 85 86 AgentLibraryList Arguments::_libraryList; 87 AgentLibraryList Arguments::_agentList; 88 89 abort_hook_t Arguments::_abort_hook = NULL; 90 exit_hook_t Arguments::_exit_hook = NULL; 91 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 92 93 94 SystemProperty *Arguments::_java_ext_dirs = NULL; 95 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 96 SystemProperty *Arguments::_sun_boot_library_path = NULL; 97 SystemProperty *Arguments::_java_library_path = NULL; 98 SystemProperty *Arguments::_java_home = NULL; 99 SystemProperty *Arguments::_java_class_path = NULL; 100 SystemProperty *Arguments::_sun_boot_class_path = NULL; 101 102 char* Arguments::_meta_index_path = NULL; 103 char* Arguments::_meta_index_dir = NULL; 104 105 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 106 107 static bool match_option(const JavaVMOption *option, const char* name, 108 const char** tail) { 109 int len = (int)strlen(name); 110 if (strncmp(option->optionString, name, len) == 0) { 111 *tail = option->optionString + len; 112 return true; 113 } else { 114 return false; 115 } 116 } 117 118 static void logOption(const char* opt) { 119 if (PrintVMOptions) { 120 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 121 } 122 } 123 124 // Process java launcher properties. 125 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 126 // See if sun.java.launcher or sun.java.launcher.pid is defined. 127 // Must do this before setting up other system properties, 128 // as some of them may depend on launcher type. 129 for (int index = 0; index < args->nOptions; index++) { 130 const JavaVMOption* option = args->options + index; 131 const char* tail; 132 133 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 134 process_java_launcher_argument(tail, option->extraInfo); 135 continue; 136 } 137 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 138 _sun_java_launcher_pid = atoi(tail); 139 continue; 140 } 141 } 142 } 143 144 // Initialize system properties key and value. 145 void Arguments::init_system_properties() { 146 147 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 148 "Java Virtual Machine Specification", false)); 149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 152 153 // following are JVMTI agent writeable properties. 154 // Properties values are set to NULL and they are 155 // os specific they are initialized in os::init_system_properties_values(). 156 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 157 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 158 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 159 _java_library_path = new SystemProperty("java.library.path", NULL, true); 160 _java_home = new SystemProperty("java.home", NULL, true); 161 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 162 163 _java_class_path = new SystemProperty("java.class.path", "", true); 164 165 // Add to System Property list. 166 PropertyList_add(&_system_properties, _java_ext_dirs); 167 PropertyList_add(&_system_properties, _java_endorsed_dirs); 168 PropertyList_add(&_system_properties, _sun_boot_library_path); 169 PropertyList_add(&_system_properties, _java_library_path); 170 PropertyList_add(&_system_properties, _java_home); 171 PropertyList_add(&_system_properties, _java_class_path); 172 PropertyList_add(&_system_properties, _sun_boot_class_path); 173 174 // Set OS specific system properties values 175 os::init_system_properties_values(); 176 } 177 178 179 // Update/Initialize System properties after JDK version number is known 180 void Arguments::init_version_specific_system_properties() { 181 enum { bufsz = 16 }; 182 char buffer[bufsz]; 183 const char* spec_vendor = "Sun Microsystems Inc."; 184 uint32_t spec_version = 0; 185 186 if (JDK_Version::is_gte_jdk17x_version()) { 187 spec_vendor = "Oracle Corporation"; 188 spec_version = JDK_Version::current().major_version(); 189 } 190 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 191 192 PropertyList_add(&_system_properties, 193 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 194 PropertyList_add(&_system_properties, 195 new SystemProperty("java.vm.specification.version", buffer, false)); 196 PropertyList_add(&_system_properties, 197 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 198 } 199 200 /** 201 * Provide a slightly more user-friendly way of eliminating -XX flags. 202 * When a flag is eliminated, it can be added to this list in order to 203 * continue accepting this flag on the command-line, while issuing a warning 204 * and ignoring the value. Once the JDK version reaches the 'accept_until' 205 * limit, we flatly refuse to admit the existence of the flag. This allows 206 * a flag to die correctly over JDK releases using HSX. 207 */ 208 typedef struct { 209 const char* name; 210 JDK_Version obsoleted_in; // when the flag went away 211 JDK_Version accept_until; // which version to start denying the existence 212 } ObsoleteFlag; 213 214 static ObsoleteFlag obsolete_jvm_flags[] = { 215 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 216 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 217 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 218 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 229 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 230 { "DefaultInitialRAMFraction", 231 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 232 { "UseDepthFirstScavengeOrder", 233 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 234 { "HandlePromotionFailure", 235 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 236 { "MaxLiveObjectEvacuationRatio", 237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 238 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 239 { "UseParallelOldGCCompacting", 240 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 241 { "UseParallelDensePrefixUpdate", 242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 243 { "UseParallelOldGCDensePrefix", 244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 245 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 246 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 247 #ifdef PRODUCT 248 { "DesiredMethodLimit", 249 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 250 #endif // PRODUCT 251 { NULL, JDK_Version(0), JDK_Version(0) } 252 }; 253 254 // Returns true if the flag is obsolete and fits into the range specified 255 // for being ignored. In the case that the flag is ignored, the 'version' 256 // value is filled in with the version number when the flag became 257 // obsolete so that that value can be displayed to the user. 258 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 259 int i = 0; 260 assert(version != NULL, "Must provide a version buffer"); 261 while (obsolete_jvm_flags[i].name != NULL) { 262 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 263 // <flag>=xxx form 264 // [-|+]<flag> form 265 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 266 ((s[0] == '+' || s[0] == '-') && 267 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 268 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 269 *version = flag_status.obsoleted_in; 270 return true; 271 } 272 } 273 i++; 274 } 275 return false; 276 } 277 278 // Constructs the system class path (aka boot class path) from the following 279 // components, in order: 280 // 281 // prefix // from -Xbootclasspath/p:... 282 // endorsed // the expansion of -Djava.endorsed.dirs=... 283 // base // from os::get_system_properties() or -Xbootclasspath= 284 // suffix // from -Xbootclasspath/a:... 285 // 286 // java.endorsed.dirs is a list of directories; any jar or zip files in the 287 // directories are added to the sysclasspath just before the base. 288 // 289 // This could be AllStatic, but it isn't needed after argument processing is 290 // complete. 291 class SysClassPath: public StackObj { 292 public: 293 SysClassPath(const char* base); 294 ~SysClassPath(); 295 296 inline void set_base(const char* base); 297 inline void add_prefix(const char* prefix); 298 inline void add_suffix_to_prefix(const char* suffix); 299 inline void add_suffix(const char* suffix); 300 inline void reset_path(const char* base); 301 302 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 303 // property. Must be called after all command-line arguments have been 304 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 305 // combined_path(). 306 void expand_endorsed(); 307 308 inline const char* get_base() const { return _items[_scp_base]; } 309 inline const char* get_prefix() const { return _items[_scp_prefix]; } 310 inline const char* get_suffix() const { return _items[_scp_suffix]; } 311 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 312 313 // Combine all the components into a single c-heap-allocated string; caller 314 // must free the string if/when no longer needed. 315 char* combined_path(); 316 317 private: 318 // Utility routines. 319 static char* add_to_path(const char* path, const char* str, bool prepend); 320 static char* add_jars_to_path(char* path, const char* directory); 321 322 inline void reset_item_at(int index); 323 324 // Array indices for the items that make up the sysclasspath. All except the 325 // base are allocated in the C heap and freed by this class. 326 enum { 327 _scp_prefix, // from -Xbootclasspath/p:... 328 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 329 _scp_base, // the default sysclasspath 330 _scp_suffix, // from -Xbootclasspath/a:... 331 _scp_nitems // the number of items, must be last. 332 }; 333 334 const char* _items[_scp_nitems]; 335 DEBUG_ONLY(bool _expansion_done;) 336 }; 337 338 SysClassPath::SysClassPath(const char* base) { 339 memset(_items, 0, sizeof(_items)); 340 _items[_scp_base] = base; 341 DEBUG_ONLY(_expansion_done = false;) 342 } 343 344 SysClassPath::~SysClassPath() { 345 // Free everything except the base. 346 for (int i = 0; i < _scp_nitems; ++i) { 347 if (i != _scp_base) reset_item_at(i); 348 } 349 DEBUG_ONLY(_expansion_done = false;) 350 } 351 352 inline void SysClassPath::set_base(const char* base) { 353 _items[_scp_base] = base; 354 } 355 356 inline void SysClassPath::add_prefix(const char* prefix) { 357 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 358 } 359 360 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 361 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 362 } 363 364 inline void SysClassPath::add_suffix(const char* suffix) { 365 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 366 } 367 368 inline void SysClassPath::reset_item_at(int index) { 369 assert(index < _scp_nitems && index != _scp_base, "just checking"); 370 if (_items[index] != NULL) { 371 FREE_C_HEAP_ARRAY(char, _items[index]); 372 _items[index] = NULL; 373 } 374 } 375 376 inline void SysClassPath::reset_path(const char* base) { 377 // Clear the prefix and suffix. 378 reset_item_at(_scp_prefix); 379 reset_item_at(_scp_suffix); 380 set_base(base); 381 } 382 383 //------------------------------------------------------------------------------ 384 385 void SysClassPath::expand_endorsed() { 386 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 387 388 const char* path = Arguments::get_property("java.endorsed.dirs"); 389 if (path == NULL) { 390 path = Arguments::get_endorsed_dir(); 391 assert(path != NULL, "no default for java.endorsed.dirs"); 392 } 393 394 char* expanded_path = NULL; 395 const char separator = *os::path_separator(); 396 const char* const end = path + strlen(path); 397 while (path < end) { 398 const char* tmp_end = strchr(path, separator); 399 if (tmp_end == NULL) { 400 expanded_path = add_jars_to_path(expanded_path, path); 401 path = end; 402 } else { 403 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1); 404 memcpy(dirpath, path, tmp_end - path); 405 dirpath[tmp_end - path] = '\0'; 406 expanded_path = add_jars_to_path(expanded_path, dirpath); 407 FREE_C_HEAP_ARRAY(char, dirpath); 408 path = tmp_end + 1; 409 } 410 } 411 _items[_scp_endorsed] = expanded_path; 412 DEBUG_ONLY(_expansion_done = true;) 413 } 414 415 // Combine the bootclasspath elements, some of which may be null, into a single 416 // c-heap-allocated string. 417 char* SysClassPath::combined_path() { 418 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 419 assert(_expansion_done, "must call expand_endorsed() first."); 420 421 size_t lengths[_scp_nitems]; 422 size_t total_len = 0; 423 424 const char separator = *os::path_separator(); 425 426 // Get the lengths. 427 int i; 428 for (i = 0; i < _scp_nitems; ++i) { 429 if (_items[i] != NULL) { 430 lengths[i] = strlen(_items[i]); 431 // Include space for the separator char (or a NULL for the last item). 432 total_len += lengths[i] + 1; 433 } 434 } 435 assert(total_len > 0, "empty sysclasspath not allowed"); 436 437 // Copy the _items to a single string. 438 char* cp = NEW_C_HEAP_ARRAY(char, total_len); 439 char* cp_tmp = cp; 440 for (i = 0; i < _scp_nitems; ++i) { 441 if (_items[i] != NULL) { 442 memcpy(cp_tmp, _items[i], lengths[i]); 443 cp_tmp += lengths[i]; 444 *cp_tmp++ = separator; 445 } 446 } 447 *--cp_tmp = '\0'; // Replace the extra separator. 448 return cp; 449 } 450 451 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 452 char* 453 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 454 char *cp; 455 456 assert(str != NULL, "just checking"); 457 if (path == NULL) { 458 size_t len = strlen(str) + 1; 459 cp = NEW_C_HEAP_ARRAY(char, len); 460 memcpy(cp, str, len); // copy the trailing null 461 } else { 462 const char separator = *os::path_separator(); 463 size_t old_len = strlen(path); 464 size_t str_len = strlen(str); 465 size_t len = old_len + str_len + 2; 466 467 if (prepend) { 468 cp = NEW_C_HEAP_ARRAY(char, len); 469 char* cp_tmp = cp; 470 memcpy(cp_tmp, str, str_len); 471 cp_tmp += str_len; 472 *cp_tmp = separator; 473 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 474 FREE_C_HEAP_ARRAY(char, path); 475 } else { 476 cp = REALLOC_C_HEAP_ARRAY(char, path, len); 477 char* cp_tmp = cp + old_len; 478 *cp_tmp = separator; 479 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 480 } 481 } 482 return cp; 483 } 484 485 // Scan the directory and append any jar or zip files found to path. 486 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 487 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 488 DIR* dir = os::opendir(directory); 489 if (dir == NULL) return path; 490 491 char dir_sep[2] = { '\0', '\0' }; 492 size_t directory_len = strlen(directory); 493 const char fileSep = *os::file_separator(); 494 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 495 496 /* Scan the directory for jars/zips, appending them to path. */ 497 struct dirent *entry; 498 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory)); 499 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 500 const char* name = entry->d_name; 501 const char* ext = name + strlen(name) - 4; 502 bool isJarOrZip = ext > name && 503 (os::file_name_strcmp(ext, ".jar") == 0 || 504 os::file_name_strcmp(ext, ".zip") == 0); 505 if (isJarOrZip) { 506 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name)); 507 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 508 path = add_to_path(path, jarpath, false); 509 FREE_C_HEAP_ARRAY(char, jarpath); 510 } 511 } 512 FREE_C_HEAP_ARRAY(char, dbuf); 513 os::closedir(dir); 514 return path; 515 } 516 517 // Parses a memory size specification string. 518 static bool atomull(const char *s, julong* result) { 519 julong n = 0; 520 int args_read = sscanf(s, os::julong_format_specifier(), &n); 521 if (args_read != 1) { 522 return false; 523 } 524 while (*s != '\0' && isdigit(*s)) { 525 s++; 526 } 527 // 4705540: illegal if more characters are found after the first non-digit 528 if (strlen(s) > 1) { 529 return false; 530 } 531 switch (*s) { 532 case 'T': case 't': 533 *result = n * G * K; 534 // Check for overflow. 535 if (*result/((julong)G * K) != n) return false; 536 return true; 537 case 'G': case 'g': 538 *result = n * G; 539 if (*result/G != n) return false; 540 return true; 541 case 'M': case 'm': 542 *result = n * M; 543 if (*result/M != n) return false; 544 return true; 545 case 'K': case 'k': 546 *result = n * K; 547 if (*result/K != n) return false; 548 return true; 549 case '\0': 550 *result = n; 551 return true; 552 default: 553 return false; 554 } 555 } 556 557 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 558 if (size < min_size) return arg_too_small; 559 // Check that size will fit in a size_t (only relevant on 32-bit) 560 if (size > max_uintx) return arg_too_big; 561 return arg_in_range; 562 } 563 564 // Describe an argument out of range error 565 void Arguments::describe_range_error(ArgsRange errcode) { 566 switch(errcode) { 567 case arg_too_big: 568 jio_fprintf(defaultStream::error_stream(), 569 "The specified size exceeds the maximum " 570 "representable size.\n"); 571 break; 572 case arg_too_small: 573 case arg_unreadable: 574 case arg_in_range: 575 // do nothing for now 576 break; 577 default: 578 ShouldNotReachHere(); 579 } 580 } 581 582 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 583 return CommandLineFlags::boolAtPut(name, &value, origin); 584 } 585 586 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 587 double v; 588 if (sscanf(value, "%lf", &v) != 1) { 589 return false; 590 } 591 592 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 593 return true; 594 } 595 return false; 596 } 597 598 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 599 julong v; 600 intx intx_v; 601 bool is_neg = false; 602 // Check the sign first since atomull() parses only unsigned values. 603 if (*value == '-') { 604 if (!CommandLineFlags::intxAt(name, &intx_v)) { 605 return false; 606 } 607 value++; 608 is_neg = true; 609 } 610 if (!atomull(value, &v)) { 611 return false; 612 } 613 intx_v = (intx) v; 614 if (is_neg) { 615 intx_v = -intx_v; 616 } 617 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 618 return true; 619 } 620 uintx uintx_v = (uintx) v; 621 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 622 return true; 623 } 624 uint64_t uint64_t_v = (uint64_t) v; 625 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 626 return true; 627 } 628 return false; 629 } 630 631 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 632 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 633 // Contract: CommandLineFlags always returns a pointer that needs freeing. 634 FREE_C_HEAP_ARRAY(char, value); 635 return true; 636 } 637 638 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 639 const char* old_value = ""; 640 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 641 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 642 size_t new_len = strlen(new_value); 643 const char* value; 644 char* free_this_too = NULL; 645 if (old_len == 0) { 646 value = new_value; 647 } else if (new_len == 0) { 648 value = old_value; 649 } else { 650 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1); 651 // each new setting adds another LINE to the switch: 652 sprintf(buf, "%s\n%s", old_value, new_value); 653 value = buf; 654 free_this_too = buf; 655 } 656 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 657 // CommandLineFlags always returns a pointer that needs freeing. 658 FREE_C_HEAP_ARRAY(char, value); 659 if (free_this_too != NULL) { 660 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 661 FREE_C_HEAP_ARRAY(char, free_this_too); 662 } 663 return true; 664 } 665 666 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 667 668 // range of acceptable characters spelled out for portability reasons 669 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 670 #define BUFLEN 255 671 char name[BUFLEN+1]; 672 char dummy; 673 674 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 675 return set_bool_flag(name, false, origin); 676 } 677 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 678 return set_bool_flag(name, true, origin); 679 } 680 681 char punct; 682 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 683 const char* value = strchr(arg, '=') + 1; 684 Flag* flag = Flag::find_flag(name, strlen(name)); 685 if (flag != NULL && flag->is_ccstr()) { 686 if (flag->ccstr_accumulates()) { 687 return append_to_string_flag(name, value, origin); 688 } else { 689 if (value[0] == '\0') { 690 value = NULL; 691 } 692 return set_string_flag(name, value, origin); 693 } 694 } 695 } 696 697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 698 const char* value = strchr(arg, '=') + 1; 699 // -XX:Foo:=xxx will reset the string flag to the given value. 700 if (value[0] == '\0') { 701 value = NULL; 702 } 703 return set_string_flag(name, value, origin); 704 } 705 706 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 707 #define SIGNED_NUMBER_RANGE "[-0123456789]" 708 #define NUMBER_RANGE "[0123456789]" 709 char value[BUFLEN + 1]; 710 char value2[BUFLEN + 1]; 711 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 712 // Looks like a floating-point number -- try again with more lenient format string 713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 714 return set_fp_numeric_flag(name, value, origin); 715 } 716 } 717 718 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 719 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 720 return set_numeric_flag(name, value, origin); 721 } 722 723 return false; 724 } 725 726 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 727 assert(bldarray != NULL, "illegal argument"); 728 729 if (arg == NULL) { 730 return; 731 } 732 733 int index = *count; 734 735 // expand the array and add arg to the last element 736 (*count)++; 737 if (*bldarray == NULL) { 738 *bldarray = NEW_C_HEAP_ARRAY(char*, *count); 739 } else { 740 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count); 741 } 742 (*bldarray)[index] = strdup(arg); 743 } 744 745 void Arguments::build_jvm_args(const char* arg) { 746 add_string(&_jvm_args_array, &_num_jvm_args, arg); 747 } 748 749 void Arguments::build_jvm_flags(const char* arg) { 750 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 751 } 752 753 // utility function to return a string that concatenates all 754 // strings in a given char** array 755 const char* Arguments::build_resource_string(char** args, int count) { 756 if (args == NULL || count == 0) { 757 return NULL; 758 } 759 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 760 for (int i = 1; i < count; i++) { 761 length += strlen(args[i]) + 1; // add 1 for a space 762 } 763 char* s = NEW_RESOURCE_ARRAY(char, length); 764 strcpy(s, args[0]); 765 for (int j = 1; j < count; j++) { 766 strcat(s, " "); 767 strcat(s, args[j]); 768 } 769 return (const char*) s; 770 } 771 772 void Arguments::print_on(outputStream* st) { 773 st->print_cr("VM Arguments:"); 774 if (num_jvm_flags() > 0) { 775 st->print("jvm_flags: "); print_jvm_flags_on(st); 776 } 777 if (num_jvm_args() > 0) { 778 st->print("jvm_args: "); print_jvm_args_on(st); 779 } 780 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 781 st->print_cr("Launcher Type: %s", _sun_java_launcher); 782 } 783 784 void Arguments::print_jvm_flags_on(outputStream* st) { 785 if (_num_jvm_flags > 0) { 786 for (int i=0; i < _num_jvm_flags; i++) { 787 st->print("%s ", _jvm_flags_array[i]); 788 } 789 st->print_cr(""); 790 } 791 } 792 793 void Arguments::print_jvm_args_on(outputStream* st) { 794 if (_num_jvm_args > 0) { 795 for (int i=0; i < _num_jvm_args; i++) { 796 st->print("%s ", _jvm_args_array[i]); 797 } 798 st->print_cr(""); 799 } 800 } 801 802 bool Arguments::process_argument(const char* arg, 803 jboolean ignore_unrecognized, FlagValueOrigin origin) { 804 805 JDK_Version since = JDK_Version(); 806 807 if (parse_argument(arg, origin) || ignore_unrecognized) { 808 return true; 809 } 810 811 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg; 812 if (is_newly_obsolete(arg, &since)) { 813 char version[256]; 814 since.to_string(version, sizeof(version)); 815 warning("ignoring option %s; support was removed in %s", argname, version); 816 return true; 817 } 818 819 // For locked flags, report a custom error message if available. 820 // Otherwise, report the standard unrecognized VM option. 821 822 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true); 823 if (locked_flag != NULL) { 824 char locked_message_buf[BUFLEN]; 825 locked_flag->get_locked_message(locked_message_buf, BUFLEN); 826 if (strlen(locked_message_buf) == 0) { 827 jio_fprintf(defaultStream::error_stream(), 828 "Unrecognized VM option '%s'\n", argname); 829 } else { 830 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 831 } 832 } else { 833 jio_fprintf(defaultStream::error_stream(), 834 "Unrecognized VM option '%s'\n", argname); 835 } 836 837 // allow for commandline "commenting out" options like -XX:#+Verbose 838 return arg[0] == '#'; 839 } 840 841 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 842 FILE* stream = fopen(file_name, "rb"); 843 if (stream == NULL) { 844 if (should_exist) { 845 jio_fprintf(defaultStream::error_stream(), 846 "Could not open settings file %s\n", file_name); 847 return false; 848 } else { 849 return true; 850 } 851 } 852 853 char token[1024]; 854 int pos = 0; 855 856 bool in_white_space = true; 857 bool in_comment = false; 858 bool in_quote = false; 859 char quote_c = 0; 860 bool result = true; 861 862 int c = getc(stream); 863 while(c != EOF) { 864 if (in_white_space) { 865 if (in_comment) { 866 if (c == '\n') in_comment = false; 867 } else { 868 if (c == '#') in_comment = true; 869 else if (!isspace(c)) { 870 in_white_space = false; 871 token[pos++] = c; 872 } 873 } 874 } else { 875 if (c == '\n' || (!in_quote && isspace(c))) { 876 // token ends at newline, or at unquoted whitespace 877 // this allows a way to include spaces in string-valued options 878 token[pos] = '\0'; 879 logOption(token); 880 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 881 build_jvm_flags(token); 882 pos = 0; 883 in_white_space = true; 884 in_quote = false; 885 } else if (!in_quote && (c == '\'' || c == '"')) { 886 in_quote = true; 887 quote_c = c; 888 } else if (in_quote && (c == quote_c)) { 889 in_quote = false; 890 } else { 891 token[pos++] = c; 892 } 893 } 894 c = getc(stream); 895 } 896 if (pos > 0) { 897 token[pos] = '\0'; 898 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 899 build_jvm_flags(token); 900 } 901 fclose(stream); 902 return result; 903 } 904 905 //============================================================================================================= 906 // Parsing of properties (-D) 907 908 const char* Arguments::get_property(const char* key) { 909 return PropertyList_get_value(system_properties(), key); 910 } 911 912 bool Arguments::add_property(const char* prop) { 913 const char* eq = strchr(prop, '='); 914 char* key; 915 // ns must be static--its address may be stored in a SystemProperty object. 916 const static char ns[1] = {0}; 917 char* value = (char *)ns; 918 919 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 920 key = AllocateHeap(key_len + 1, "add_property"); 921 strncpy(key, prop, key_len); 922 key[key_len] = '\0'; 923 924 if (eq != NULL) { 925 size_t value_len = strlen(prop) - key_len - 1; 926 value = AllocateHeap(value_len + 1, "add_property"); 927 strncpy(value, &prop[key_len + 1], value_len + 1); 928 } 929 930 if (strcmp(key, "java.compiler") == 0) { 931 process_java_compiler_argument(value); 932 FreeHeap(key); 933 if (eq != NULL) { 934 FreeHeap(value); 935 } 936 return true; 937 } else if (strcmp(key, "sun.java.command") == 0) { 938 _java_command = value; 939 940 // Record value in Arguments, but let it get passed to Java. 941 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 942 // launcher.pid property is private and is processed 943 // in process_sun_java_launcher_properties(); 944 // the sun.java.launcher property is passed on to the java application 945 FreeHeap(key); 946 if (eq != NULL) { 947 FreeHeap(value); 948 } 949 return true; 950 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 951 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 952 // its value without going through the property list or making a Java call. 953 _java_vendor_url_bug = value; 954 } else if (strcmp(key, "sun.boot.library.path") == 0) { 955 PropertyList_unique_add(&_system_properties, key, value, true); 956 return true; 957 } 958 // Create new property and add at the end of the list 959 PropertyList_unique_add(&_system_properties, key, value); 960 return true; 961 } 962 963 //=========================================================================================================== 964 // Setting int/mixed/comp mode flags 965 966 void Arguments::set_mode_flags(Mode mode) { 967 // Set up default values for all flags. 968 // If you add a flag to any of the branches below, 969 // add a default value for it here. 970 set_java_compiler(false); 971 _mode = mode; 972 973 // Ensure Agent_OnLoad has the correct initial values. 974 // This may not be the final mode; mode may change later in onload phase. 975 PropertyList_unique_add(&_system_properties, "java.vm.info", 976 (char*)VM_Version::vm_info_string(), false); 977 978 UseInterpreter = true; 979 UseCompiler = true; 980 UseLoopCounter = true; 981 982 #ifndef ZERO 983 // Turn these off for mixed and comp. Leave them on for Zero. 984 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 985 UseFastAccessorMethods = (mode == _int); 986 } 987 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 988 UseFastEmptyMethods = (mode == _int); 989 } 990 #endif 991 992 // Default values may be platform/compiler dependent - 993 // use the saved values 994 ClipInlining = Arguments::_ClipInlining; 995 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 996 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 997 BackgroundCompilation = Arguments::_BackgroundCompilation; 998 999 // Change from defaults based on mode 1000 switch (mode) { 1001 default: 1002 ShouldNotReachHere(); 1003 break; 1004 case _int: 1005 UseCompiler = false; 1006 UseLoopCounter = false; 1007 AlwaysCompileLoopMethods = false; 1008 UseOnStackReplacement = false; 1009 break; 1010 case _mixed: 1011 // same as default 1012 break; 1013 case _comp: 1014 UseInterpreter = false; 1015 BackgroundCompilation = false; 1016 ClipInlining = false; 1017 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1018 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1019 // compile a level 4 (C2) and then continue executing it. 1020 if (TieredCompilation) { 1021 Tier3InvokeNotifyFreqLog = 0; 1022 Tier4InvocationThreshold = 0; 1023 } 1024 break; 1025 } 1026 } 1027 1028 // Conflict: required to use shared spaces (-Xshare:on), but 1029 // incompatible command line options were chosen. 1030 1031 static void no_shared_spaces() { 1032 if (RequireSharedSpaces) { 1033 jio_fprintf(defaultStream::error_stream(), 1034 "Class data sharing is inconsistent with other specified options.\n"); 1035 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1036 } else { 1037 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1038 } 1039 } 1040 1041 void Arguments::set_tiered_flags() { 1042 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1043 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1044 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1045 } 1046 if (CompilationPolicyChoice < 2) { 1047 vm_exit_during_initialization( 1048 "Incompatible compilation policy selected", NULL); 1049 } 1050 // Increase the code cache size - tiered compiles a lot more. 1051 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1052 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1053 } 1054 } 1055 1056 #ifndef KERNEL 1057 static void disable_adaptive_size_policy(const char* collector_name) { 1058 if (UseAdaptiveSizePolicy) { 1059 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1060 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1061 collector_name); 1062 } 1063 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1064 } 1065 } 1066 1067 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 1068 // if it's not explictly set or unset. If the user has chosen 1069 // UseParNewGC and not explicitly set ParallelGCThreads we 1070 // set it, unless this is a single cpu machine. 1071 void Arguments::set_parnew_gc_flags() { 1072 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1073 "control point invariant"); 1074 assert(UseParNewGC, "Error"); 1075 1076 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1077 disable_adaptive_size_policy("UseParNewGC"); 1078 1079 if (ParallelGCThreads == 0) { 1080 FLAG_SET_DEFAULT(ParallelGCThreads, 1081 Abstract_VM_Version::parallel_worker_threads()); 1082 if (ParallelGCThreads == 1) { 1083 FLAG_SET_DEFAULT(UseParNewGC, false); 1084 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 1085 } 1086 } 1087 if (UseParNewGC) { 1088 // CDS doesn't work with ParNew yet 1089 no_shared_spaces(); 1090 1091 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1092 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1093 // we set them to 1024 and 1024. 1094 // See CR 6362902. 1095 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1096 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1097 } 1098 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1099 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1100 } 1101 1102 // AlwaysTenure flag should make ParNew promote all at first collection. 1103 // See CR 6362902. 1104 if (AlwaysTenure) { 1105 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 1106 } 1107 // When using compressed oops, we use local overflow stacks, 1108 // rather than using a global overflow list chained through 1109 // the klass word of the object's pre-image. 1110 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1111 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1112 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1113 } 1114 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1115 } 1116 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1117 } 1118 } 1119 1120 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1121 // sparc/solaris for certain applications, but would gain from 1122 // further optimization and tuning efforts, and would almost 1123 // certainly gain from analysis of platform and environment. 1124 void Arguments::set_cms_and_parnew_gc_flags() { 1125 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1126 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1127 1128 // If we are using CMS, we prefer to UseParNewGC, 1129 // unless explicitly forbidden. 1130 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1131 FLAG_SET_ERGO(bool, UseParNewGC, true); 1132 } 1133 1134 // Turn off AdaptiveSizePolicy for CMS until it is complete. 1135 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1136 1137 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1138 // as needed. 1139 if (UseParNewGC) { 1140 set_parnew_gc_flags(); 1141 } 1142 1143 // MaxHeapSize is aligned down in collectorPolicy 1144 size_t max_heap = align_size_down(MaxHeapSize, 1145 CardTableRS::ct_max_alignment_constraint()); 1146 1147 // Now make adjustments for CMS 1148 intx tenuring_default = (intx)6; 1149 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1150 1151 // Preferred young gen size for "short" pauses: 1152 // upper bound depends on # of threads and NewRatio. 1153 const uintx parallel_gc_threads = 1154 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1155 const size_t preferred_max_new_size_unaligned = 1156 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1157 size_t preferred_max_new_size = 1158 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1159 1160 // Unless explicitly requested otherwise, size young gen 1161 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1162 1163 // If either MaxNewSize or NewRatio is set on the command line, 1164 // assume the user is trying to set the size of the young gen. 1165 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1166 1167 // Set MaxNewSize to our calculated preferred_max_new_size unless 1168 // NewSize was set on the command line and it is larger than 1169 // preferred_max_new_size. 1170 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1171 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1172 } else { 1173 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1174 } 1175 if (PrintGCDetails && Verbose) { 1176 // Too early to use gclog_or_tty 1177 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1178 } 1179 1180 // Code along this path potentially sets NewSize and OldSize 1181 1182 assert(max_heap >= InitialHeapSize, "Error"); 1183 assert(max_heap >= NewSize, "Error"); 1184 1185 if (PrintGCDetails && Verbose) { 1186 // Too early to use gclog_or_tty 1187 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1188 " initial_heap_size: " SIZE_FORMAT 1189 " max_heap: " SIZE_FORMAT, 1190 min_heap_size(), InitialHeapSize, max_heap); 1191 } 1192 size_t min_new = preferred_max_new_size; 1193 if (FLAG_IS_CMDLINE(NewSize)) { 1194 min_new = NewSize; 1195 } 1196 if (max_heap > min_new && min_heap_size() > min_new) { 1197 // Unless explicitly requested otherwise, make young gen 1198 // at least min_new, and at most preferred_max_new_size. 1199 if (FLAG_IS_DEFAULT(NewSize)) { 1200 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1201 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1202 if (PrintGCDetails && Verbose) { 1203 // Too early to use gclog_or_tty 1204 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1205 } 1206 } 1207 // Unless explicitly requested otherwise, size old gen 1208 // so it's NewRatio x of NewSize. 1209 if (FLAG_IS_DEFAULT(OldSize)) { 1210 if (max_heap > NewSize) { 1211 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1212 if (PrintGCDetails && Verbose) { 1213 // Too early to use gclog_or_tty 1214 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1215 } 1216 } 1217 } 1218 } 1219 } 1220 // Unless explicitly requested otherwise, definitely 1221 // promote all objects surviving "tenuring_default" scavenges. 1222 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1223 FLAG_IS_DEFAULT(SurvivorRatio)) { 1224 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1225 } 1226 // If we decided above (or user explicitly requested) 1227 // `promote all' (via MaxTenuringThreshold := 0), 1228 // prefer minuscule survivor spaces so as not to waste 1229 // space for (non-existent) survivors 1230 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1231 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1232 } 1233 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1234 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1235 // This is done in order to make ParNew+CMS configuration to work 1236 // with YoungPLABSize and OldPLABSize options. 1237 // See CR 6362902. 1238 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1239 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1240 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1241 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1242 // the value (either from the command line or ergonomics) of 1243 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1244 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1245 } else { 1246 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1247 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1248 // we'll let it to take precedence. 1249 jio_fprintf(defaultStream::error_stream(), 1250 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1251 " options are specified for the CMS collector." 1252 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1253 } 1254 } 1255 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1256 // OldPLAB sizing manually turned off: Use a larger default setting, 1257 // unless it was manually specified. This is because a too-low value 1258 // will slow down scavenges. 1259 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1260 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1261 } 1262 } 1263 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1264 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1265 // If either of the static initialization defaults have changed, note this 1266 // modification. 1267 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1268 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1269 } 1270 if (PrintGCDetails && Verbose) { 1271 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1272 MarkStackSize / K, MarkStackSizeMax / K); 1273 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1274 } 1275 } 1276 #endif // KERNEL 1277 1278 void set_object_alignment() { 1279 // Object alignment. 1280 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1281 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1282 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1283 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1284 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1285 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1286 1287 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1288 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1289 1290 // Oop encoding heap max 1291 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1292 1293 #ifndef KERNEL 1294 // Set CMS global values 1295 CompactibleFreeListSpace::set_cms_values(); 1296 #endif // KERNEL 1297 } 1298 1299 bool verify_object_alignment() { 1300 // Object alignment. 1301 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1302 jio_fprintf(defaultStream::error_stream(), 1303 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1304 (int)ObjectAlignmentInBytes); 1305 return false; 1306 } 1307 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1308 jio_fprintf(defaultStream::error_stream(), 1309 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1310 (int)ObjectAlignmentInBytes, BytesPerLong); 1311 return false; 1312 } 1313 // It does not make sense to have big object alignment 1314 // since a space lost due to alignment will be greater 1315 // then a saved space from compressed oops. 1316 if ((int)ObjectAlignmentInBytes > 256) { 1317 jio_fprintf(defaultStream::error_stream(), 1318 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n", 1319 (int)ObjectAlignmentInBytes); 1320 return false; 1321 } 1322 // In case page size is very small. 1323 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1324 jio_fprintf(defaultStream::error_stream(), 1325 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n", 1326 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1327 return false; 1328 } 1329 return true; 1330 } 1331 1332 inline uintx max_heap_for_compressed_oops() { 1333 // Avoid sign flip. 1334 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) { 1335 return 0; 1336 } 1337 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1338 NOT_LP64(ShouldNotReachHere(); return 0); 1339 } 1340 1341 bool Arguments::should_auto_select_low_pause_collector() { 1342 if (UseAutoGCSelectPolicy && 1343 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1344 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1345 if (PrintGCDetails) { 1346 // Cannot use gclog_or_tty yet. 1347 tty->print_cr("Automatic selection of the low pause collector" 1348 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1349 } 1350 return true; 1351 } 1352 return false; 1353 } 1354 1355 void Arguments::set_ergonomics_flags() { 1356 // Parallel GC is not compatible with sharing. If one specifies 1357 // that they want sharing explicitly, do not set ergonomics flags. 1358 if (DumpSharedSpaces || RequireSharedSpaces) { 1359 return; 1360 } 1361 1362 if (os::is_server_class_machine()) { 1363 // If no other collector is requested explicitly, 1364 // let the VM select the collector based on 1365 // machine class and automatic selection policy. 1366 if (!UseSerialGC && 1367 !UseConcMarkSweepGC && 1368 !UseG1GC && 1369 !UseParNewGC && 1370 !DumpSharedSpaces && 1371 FLAG_IS_DEFAULT(UseParallelGC)) { 1372 if (should_auto_select_low_pause_collector()) { 1373 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1374 } else { 1375 FLAG_SET_ERGO(bool, UseParallelGC, true); 1376 } 1377 no_shared_spaces(); 1378 } 1379 } 1380 1381 #ifndef ZERO 1382 #ifdef _LP64 1383 // Check that UseCompressedOops can be set with the max heap size allocated 1384 // by ergonomics. 1385 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1386 #if !defined(COMPILER1) || defined(TIERED) 1387 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1388 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1389 } 1390 #endif 1391 #ifdef _WIN64 1392 if (UseLargePages && UseCompressedOops) { 1393 // Cannot allocate guard pages for implicit checks in indexed addressing 1394 // mode, when large pages are specified on windows. 1395 // This flag could be switched ON if narrow oop base address is set to 0, 1396 // see code in Universe::initialize_heap(). 1397 Universe::set_narrow_oop_use_implicit_null_checks(false); 1398 } 1399 #endif // _WIN64 1400 } else { 1401 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1402 warning("Max heap size too large for Compressed Oops"); 1403 FLAG_SET_DEFAULT(UseCompressedOops, false); 1404 } 1405 } 1406 // Also checks that certain machines are slower with compressed oops 1407 // in vm_version initialization code. 1408 #endif // _LP64 1409 #endif // !ZERO 1410 } 1411 1412 void Arguments::set_parallel_gc_flags() { 1413 assert(UseParallelGC || UseParallelOldGC, "Error"); 1414 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1415 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1416 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1417 } 1418 FLAG_SET_DEFAULT(UseParallelGC, true); 1419 1420 // If no heap maximum was requested explicitly, use some reasonable fraction 1421 // of the physical memory, up to a maximum of 1GB. 1422 if (UseParallelGC) { 1423 FLAG_SET_DEFAULT(ParallelGCThreads, 1424 Abstract_VM_Version::parallel_worker_threads()); 1425 1426 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1427 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1428 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1429 // See CR 6362902 for details. 1430 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1431 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1432 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1433 } 1434 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1435 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1436 } 1437 } 1438 1439 if (UseParallelOldGC) { 1440 // Par compact uses lower default values since they are treated as 1441 // minimums. These are different defaults because of the different 1442 // interpretation and are not ergonomically set. 1443 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1444 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1445 } 1446 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1447 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1448 } 1449 } 1450 } 1451 if (UseNUMA) { 1452 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 1453 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 1454 } 1455 // For those collectors or operating systems (eg, Windows) that do 1456 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 1457 UseNUMAInterleaving = true; 1458 } 1459 } 1460 1461 void Arguments::set_g1_gc_flags() { 1462 assert(UseG1GC, "Error"); 1463 #ifdef COMPILER1 1464 FastTLABRefill = false; 1465 #endif 1466 FLAG_SET_DEFAULT(ParallelGCThreads, 1467 Abstract_VM_Version::parallel_worker_threads()); 1468 if (ParallelGCThreads == 0) { 1469 FLAG_SET_DEFAULT(ParallelGCThreads, 1470 Abstract_VM_Version::parallel_worker_threads()); 1471 } 1472 no_shared_spaces(); 1473 1474 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1475 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1476 } 1477 if (PrintGCDetails && Verbose) { 1478 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1479 MarkStackSize / K, MarkStackSizeMax / K); 1480 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1481 } 1482 1483 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1484 // In G1, we want the default GC overhead goal to be higher than 1485 // say in PS. So we set it here to 10%. Otherwise the heap might 1486 // be expanded more aggressively than we would like it to. In 1487 // fact, even 10% seems to not be high enough in some cases 1488 // (especially small GC stress tests that the main thing they do 1489 // is allocation). We might consider increase it further. 1490 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1491 } 1492 } 1493 1494 void Arguments::set_heap_size() { 1495 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1496 // Deprecated flag 1497 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1498 } 1499 1500 const julong phys_mem = 1501 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1502 : (julong)MaxRAM; 1503 1504 // If the maximum heap size has not been set with -Xmx, 1505 // then set it as fraction of the size of physical memory, 1506 // respecting the maximum and minimum sizes of the heap. 1507 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1508 julong reasonable_max = phys_mem / MaxRAMFraction; 1509 1510 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1511 // Small physical memory, so use a minimum fraction of it for the heap 1512 reasonable_max = phys_mem / MinRAMFraction; 1513 } else { 1514 // Not-small physical memory, so require a heap at least 1515 // as large as MaxHeapSize 1516 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1517 } 1518 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1519 // Limit the heap size to ErgoHeapSizeLimit 1520 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1521 } 1522 if (UseCompressedOops) { 1523 // Limit the heap size to the maximum possible when using compressed oops 1524 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1525 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1526 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1527 // but it should be not less than default MaxHeapSize. 1528 max_coop_heap -= HeapBaseMinAddress; 1529 } 1530 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1531 } 1532 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1533 1534 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1535 // An initial heap size was specified on the command line, 1536 // so be sure that the maximum size is consistent. Done 1537 // after call to allocatable_physical_memory because that 1538 // method might reduce the allocation size. 1539 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1540 } 1541 1542 if (PrintGCDetails && Verbose) { 1543 // Cannot use gclog_or_tty yet. 1544 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1545 } 1546 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1547 } 1548 1549 // If the initial_heap_size has not been set with InitialHeapSize 1550 // or -Xms, then set it as fraction of the size of physical memory, 1551 // respecting the maximum and minimum sizes of the heap. 1552 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1553 julong reasonable_minimum = (julong)(OldSize + NewSize); 1554 1555 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1556 1557 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1558 1559 julong reasonable_initial = phys_mem / InitialRAMFraction; 1560 1561 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1562 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1563 1564 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1565 1566 if (PrintGCDetails && Verbose) { 1567 // Cannot use gclog_or_tty yet. 1568 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1569 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1570 } 1571 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1572 set_min_heap_size((uintx)reasonable_minimum); 1573 } 1574 } 1575 1576 // This must be called after ergonomics because we want bytecode rewriting 1577 // if the server compiler is used, or if UseSharedSpaces is disabled. 1578 void Arguments::set_bytecode_flags() { 1579 // Better not attempt to store into a read-only space. 1580 if (UseSharedSpaces) { 1581 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1582 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1583 } 1584 1585 if (!RewriteBytecodes) { 1586 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1587 } 1588 } 1589 1590 // Aggressive optimization flags -XX:+AggressiveOpts 1591 void Arguments::set_aggressive_opts_flags() { 1592 #ifdef COMPILER2 1593 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1594 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1595 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1596 } 1597 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1598 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1599 } 1600 1601 // Feed the cache size setting into the JDK 1602 char buffer[1024]; 1603 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1604 add_property(buffer); 1605 } 1606 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1607 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1608 } 1609 #endif 1610 1611 if (AggressiveOpts) { 1612 // Sample flag setting code 1613 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1614 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1615 // } 1616 } 1617 } 1618 1619 //=========================================================================================================== 1620 // Parsing of java.compiler property 1621 1622 void Arguments::process_java_compiler_argument(char* arg) { 1623 // For backwards compatibility, Djava.compiler=NONE or "" 1624 // causes us to switch to -Xint mode UNLESS -Xdebug 1625 // is also specified. 1626 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1627 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1628 } 1629 } 1630 1631 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1632 _sun_java_launcher = strdup(launcher); 1633 if (strcmp("gamma", _sun_java_launcher) == 0) { 1634 _created_by_gamma_launcher = true; 1635 } 1636 } 1637 1638 bool Arguments::created_by_java_launcher() { 1639 assert(_sun_java_launcher != NULL, "property must have value"); 1640 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1641 } 1642 1643 bool Arguments::created_by_gamma_launcher() { 1644 return _created_by_gamma_launcher; 1645 } 1646 1647 //=========================================================================================================== 1648 // Parsing of main arguments 1649 1650 bool Arguments::verify_interval(uintx val, uintx min, 1651 uintx max, const char* name) { 1652 // Returns true iff value is in the inclusive interval [min..max] 1653 // false, otherwise. 1654 if (val >= min && val <= max) { 1655 return true; 1656 } 1657 jio_fprintf(defaultStream::error_stream(), 1658 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1659 " and " UINTX_FORMAT "\n", 1660 name, val, min, max); 1661 return false; 1662 } 1663 1664 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1665 // Returns true if given value is at least specified min threshold 1666 // false, otherwise. 1667 if (val >= min ) { 1668 return true; 1669 } 1670 jio_fprintf(defaultStream::error_stream(), 1671 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1672 name, val, min); 1673 return false; 1674 } 1675 1676 bool Arguments::verify_percentage(uintx value, const char* name) { 1677 if (value <= 100) { 1678 return true; 1679 } 1680 jio_fprintf(defaultStream::error_stream(), 1681 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1682 name, value); 1683 return false; 1684 } 1685 1686 static void force_serial_gc() { 1687 FLAG_SET_DEFAULT(UseSerialGC, true); 1688 FLAG_SET_DEFAULT(UseParNewGC, false); 1689 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1690 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1691 FLAG_SET_DEFAULT(UseParallelGC, false); 1692 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1693 FLAG_SET_DEFAULT(UseG1GC, false); 1694 } 1695 1696 static bool verify_serial_gc_flags() { 1697 return (UseSerialGC && 1698 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1699 UseParallelGC || UseParallelOldGC)); 1700 } 1701 1702 // check if do gclog rotation 1703 // +UseGCLogFileRotation is a must, 1704 // no gc log rotation when log file not supplied or 1705 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1706 void check_gclog_consistency() { 1707 if (UseGCLogFileRotation) { 1708 if ((Arguments::gc_log_filename() == NULL) || 1709 (NumberOfGCLogFiles == 0) || 1710 (GCLogFileSize == 0)) { 1711 jio_fprintf(defaultStream::output_stream(), 1712 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1713 "where num_of_file > 0 and num_of_size > 0\n" 1714 "GC log rotation is turned off\n"); 1715 UseGCLogFileRotation = false; 1716 } 1717 } 1718 1719 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1720 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1721 jio_fprintf(defaultStream::output_stream(), 1722 "GCLogFileSize changed to minimum 8K\n"); 1723 } 1724 } 1725 1726 // Check consistency of GC selection 1727 bool Arguments::check_gc_consistency() { 1728 check_gclog_consistency(); 1729 bool status = true; 1730 // Ensure that the user has not selected conflicting sets 1731 // of collectors. [Note: this check is merely a user convenience; 1732 // collectors over-ride each other so that only a non-conflicting 1733 // set is selected; however what the user gets is not what they 1734 // may have expected from the combination they asked for. It's 1735 // better to reduce user confusion by not allowing them to 1736 // select conflicting combinations. 1737 uint i = 0; 1738 if (UseSerialGC) i++; 1739 if (UseConcMarkSweepGC || UseParNewGC) i++; 1740 if (UseParallelGC || UseParallelOldGC) i++; 1741 if (UseG1GC) i++; 1742 if (i > 1) { 1743 jio_fprintf(defaultStream::error_stream(), 1744 "Conflicting collector combinations in option list; " 1745 "please refer to the release notes for the combinations " 1746 "allowed\n"); 1747 status = false; 1748 } 1749 1750 return status; 1751 } 1752 1753 // Check stack pages settings 1754 bool Arguments::check_stack_pages() 1755 { 1756 bool status = true; 1757 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1758 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1759 // greater stack shadow pages can't generate instruction to bang stack 1760 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1761 return status; 1762 } 1763 1764 // Check the consistency of vm_init_args 1765 bool Arguments::check_vm_args_consistency() { 1766 // Method for adding checks for flag consistency. 1767 // The intent is to warn the user of all possible conflicts, 1768 // before returning an error. 1769 // Note: Needs platform-dependent factoring. 1770 bool status = true; 1771 1772 #if ( (defined(COMPILER2) && defined(SPARC))) 1773 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1774 // on sparc doesn't require generation of a stub as is the case on, e.g., 1775 // x86. Normally, VM_Version_init must be called from init_globals in 1776 // init.cpp, which is called by the initial java thread *after* arguments 1777 // have been parsed. VM_Version_init gets called twice on sparc. 1778 extern void VM_Version_init(); 1779 VM_Version_init(); 1780 if (!VM_Version::has_v9()) { 1781 jio_fprintf(defaultStream::error_stream(), 1782 "V8 Machine detected, Server requires V9\n"); 1783 status = false; 1784 } 1785 #endif /* COMPILER2 && SPARC */ 1786 1787 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1788 // builds so the cost of stack banging can be measured. 1789 #if (defined(PRODUCT) && defined(SOLARIS)) 1790 if (!UseBoundThreads && !UseStackBanging) { 1791 jio_fprintf(defaultStream::error_stream(), 1792 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1793 1794 status = false; 1795 } 1796 #endif 1797 1798 if (TLABRefillWasteFraction == 0) { 1799 jio_fprintf(defaultStream::error_stream(), 1800 "TLABRefillWasteFraction should be a denominator, " 1801 "not " SIZE_FORMAT "\n", 1802 TLABRefillWasteFraction); 1803 status = false; 1804 } 1805 1806 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1807 "AdaptiveSizePolicyWeight"); 1808 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1809 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1810 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1811 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1812 1813 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1814 jio_fprintf(defaultStream::error_stream(), 1815 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1816 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1817 MinHeapFreeRatio, MaxHeapFreeRatio); 1818 status = false; 1819 } 1820 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1821 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1822 1823 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1824 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1825 } 1826 1827 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1828 // Settings to encourage splitting. 1829 if (!FLAG_IS_CMDLINE(NewRatio)) { 1830 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1831 } 1832 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1833 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1834 } 1835 } 1836 1837 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1838 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1839 if (GCTimeLimit == 100) { 1840 // Turn off gc-overhead-limit-exceeded checks 1841 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1842 } 1843 1844 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1845 1846 status = status && check_gc_consistency(); 1847 status = status && check_stack_pages(); 1848 1849 if (_has_alloc_profile) { 1850 if (UseParallelGC || UseParallelOldGC) { 1851 jio_fprintf(defaultStream::error_stream(), 1852 "error: invalid argument combination.\n" 1853 "Allocation profiling (-Xaprof) cannot be used together with " 1854 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1855 status = false; 1856 } 1857 if (UseConcMarkSweepGC) { 1858 jio_fprintf(defaultStream::error_stream(), 1859 "error: invalid argument combination.\n" 1860 "Allocation profiling (-Xaprof) cannot be used together with " 1861 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1862 status = false; 1863 } 1864 } 1865 1866 if (CMSIncrementalMode) { 1867 if (!UseConcMarkSweepGC) { 1868 jio_fprintf(defaultStream::error_stream(), 1869 "error: invalid argument combination.\n" 1870 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1871 "selected in order\nto use CMSIncrementalMode.\n"); 1872 status = false; 1873 } else { 1874 status = status && verify_percentage(CMSIncrementalDutyCycle, 1875 "CMSIncrementalDutyCycle"); 1876 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1877 "CMSIncrementalDutyCycleMin"); 1878 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1879 "CMSIncrementalSafetyFactor"); 1880 status = status && verify_percentage(CMSIncrementalOffset, 1881 "CMSIncrementalOffset"); 1882 status = status && verify_percentage(CMSExpAvgFactor, 1883 "CMSExpAvgFactor"); 1884 // If it was not set on the command line, set 1885 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1886 if (CMSInitiatingOccupancyFraction < 0) { 1887 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1888 } 1889 } 1890 } 1891 1892 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1893 // insists that we hold the requisite locks so that the iteration is 1894 // MT-safe. For the verification at start-up and shut-down, we don't 1895 // yet have a good way of acquiring and releasing these locks, 1896 // which are not visible at the CollectedHeap level. We want to 1897 // be able to acquire these locks and then do the iteration rather 1898 // than just disable the lock verification. This will be fixed under 1899 // bug 4788986. 1900 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1901 if (VerifyGCStartAt == 0) { 1902 warning("Heap verification at start-up disabled " 1903 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1904 VerifyGCStartAt = 1; // Disable verification at start-up 1905 } 1906 if (VerifyBeforeExit) { 1907 warning("Heap verification at shutdown disabled " 1908 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1909 VerifyBeforeExit = false; // Disable verification at shutdown 1910 } 1911 } 1912 1913 // Note: only executed in non-PRODUCT mode 1914 if (!UseAsyncConcMarkSweepGC && 1915 (ExplicitGCInvokesConcurrent || 1916 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1917 jio_fprintf(defaultStream::error_stream(), 1918 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1919 " with -UseAsyncConcMarkSweepGC"); 1920 status = false; 1921 } 1922 1923 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 1924 1925 #ifndef SERIALGC 1926 if (UseG1GC) { 1927 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1928 "InitiatingHeapOccupancyPercent"); 1929 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1930 "G1RefProcDrainInterval"); 1931 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1932 "G1ConcMarkStepDurationMillis"); 1933 } 1934 #endif 1935 1936 status = status && verify_interval(RefDiscoveryPolicy, 1937 ReferenceProcessor::DiscoveryPolicyMin, 1938 ReferenceProcessor::DiscoveryPolicyMax, 1939 "RefDiscoveryPolicy"); 1940 1941 // Limit the lower bound of this flag to 1 as it is used in a division 1942 // expression. 1943 status = status && verify_interval(TLABWasteTargetPercent, 1944 1, 100, "TLABWasteTargetPercent"); 1945 1946 status = status && verify_object_alignment(); 1947 1948 return status; 1949 } 1950 1951 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1952 const char* option_type) { 1953 if (ignore) return false; 1954 1955 const char* spacer = " "; 1956 if (option_type == NULL) { 1957 option_type = ++spacer; // Set both to the empty string. 1958 } 1959 1960 if (os::obsolete_option(option)) { 1961 jio_fprintf(defaultStream::error_stream(), 1962 "Obsolete %s%soption: %s\n", option_type, spacer, 1963 option->optionString); 1964 return false; 1965 } else { 1966 jio_fprintf(defaultStream::error_stream(), 1967 "Unrecognized %s%soption: %s\n", option_type, spacer, 1968 option->optionString); 1969 return true; 1970 } 1971 } 1972 1973 static const char* user_assertion_options[] = { 1974 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1975 }; 1976 1977 static const char* system_assertion_options[] = { 1978 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1979 }; 1980 1981 // Return true if any of the strings in null-terminated array 'names' matches. 1982 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 1983 // the option must match exactly. 1984 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 1985 bool tail_allowed) { 1986 for (/* empty */; *names != NULL; ++names) { 1987 if (match_option(option, *names, tail)) { 1988 if (**tail == '\0' || tail_allowed && **tail == ':') { 1989 return true; 1990 } 1991 } 1992 } 1993 return false; 1994 } 1995 1996 bool Arguments::parse_uintx(const char* value, 1997 uintx* uintx_arg, 1998 uintx min_size) { 1999 2000 // Check the sign first since atomull() parses only unsigned values. 2001 bool value_is_positive = !(*value == '-'); 2002 2003 if (value_is_positive) { 2004 julong n; 2005 bool good_return = atomull(value, &n); 2006 if (good_return) { 2007 bool above_minimum = n >= min_size; 2008 bool value_is_too_large = n > max_uintx; 2009 2010 if (above_minimum && !value_is_too_large) { 2011 *uintx_arg = n; 2012 return true; 2013 } 2014 } 2015 } 2016 return false; 2017 } 2018 2019 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2020 julong* long_arg, 2021 julong min_size) { 2022 if (!atomull(s, long_arg)) return arg_unreadable; 2023 return check_memory_size(*long_arg, min_size); 2024 } 2025 2026 // Parse JavaVMInitArgs structure 2027 2028 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2029 // For components of the system classpath. 2030 SysClassPath scp(Arguments::get_sysclasspath()); 2031 bool scp_assembly_required = false; 2032 2033 // Save default settings for some mode flags 2034 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2035 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2036 Arguments::_ClipInlining = ClipInlining; 2037 Arguments::_BackgroundCompilation = BackgroundCompilation; 2038 2039 // Setup flags for mixed which is the default 2040 set_mode_flags(_mixed); 2041 2042 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2043 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2044 if (result != JNI_OK) { 2045 return result; 2046 } 2047 2048 // Parse JavaVMInitArgs structure passed in 2049 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2050 if (result != JNI_OK) { 2051 return result; 2052 } 2053 2054 if (AggressiveOpts) { 2055 // Insert alt-rt.jar between user-specified bootclasspath 2056 // prefix and the default bootclasspath. os::set_boot_path() 2057 // uses meta_index_dir as the default bootclasspath directory. 2058 const char* altclasses_jar = "alt-rt.jar"; 2059 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2060 strlen(altclasses_jar); 2061 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 2062 strcpy(altclasses_path, get_meta_index_dir()); 2063 strcat(altclasses_path, altclasses_jar); 2064 scp.add_suffix_to_prefix(altclasses_path); 2065 scp_assembly_required = true; 2066 FREE_C_HEAP_ARRAY(char, altclasses_path); 2067 } 2068 2069 if (WhiteBoxAPI) { 2070 // Append wb.jar to bootclasspath if enabled 2071 const char* wb_jar = "wb.jar"; 2072 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 + 2073 strlen(wb_jar); 2074 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len); 2075 strcpy(wb_path, get_meta_index_dir()); 2076 strcat(wb_path, wb_jar); 2077 scp.add_suffix(wb_path); 2078 scp_assembly_required = true; 2079 FREE_C_HEAP_ARRAY(char, wb_path); 2080 } 2081 2082 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2083 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2084 if (result != JNI_OK) { 2085 return result; 2086 } 2087 2088 // Do final processing now that all arguments have been parsed 2089 result = finalize_vm_init_args(&scp, scp_assembly_required); 2090 if (result != JNI_OK) { 2091 return result; 2092 } 2093 2094 return JNI_OK; 2095 } 2096 2097 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2098 SysClassPath* scp_p, 2099 bool* scp_assembly_required_p, 2100 FlagValueOrigin origin) { 2101 // Remaining part of option string 2102 const char* tail; 2103 2104 // iterate over arguments 2105 for (int index = 0; index < args->nOptions; index++) { 2106 bool is_absolute_path = false; // for -agentpath vs -agentlib 2107 2108 const JavaVMOption* option = args->options + index; 2109 2110 if (!match_option(option, "-Djava.class.path", &tail) && 2111 !match_option(option, "-Dsun.java.command", &tail) && 2112 !match_option(option, "-Dsun.java.launcher", &tail)) { 2113 2114 // add all jvm options to the jvm_args string. This string 2115 // is used later to set the java.vm.args PerfData string constant. 2116 // the -Djava.class.path and the -Dsun.java.command options are 2117 // omitted from jvm_args string as each have their own PerfData 2118 // string constant object. 2119 build_jvm_args(option->optionString); 2120 } 2121 2122 // -verbose:[class/gc/jni] 2123 if (match_option(option, "-verbose", &tail)) { 2124 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2125 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2126 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2127 } else if (!strcmp(tail, ":gc")) { 2128 FLAG_SET_CMDLINE(bool, PrintGC, true); 2129 } else if (!strcmp(tail, ":jni")) { 2130 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2131 } 2132 // -da / -ea / -disableassertions / -enableassertions 2133 // These accept an optional class/package name separated by a colon, e.g., 2134 // -da:java.lang.Thread. 2135 } else if (match_option(option, user_assertion_options, &tail, true)) { 2136 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2137 if (*tail == '\0') { 2138 JavaAssertions::setUserClassDefault(enable); 2139 } else { 2140 assert(*tail == ':', "bogus match by match_option()"); 2141 JavaAssertions::addOption(tail + 1, enable); 2142 } 2143 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2144 } else if (match_option(option, system_assertion_options, &tail, false)) { 2145 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2146 JavaAssertions::setSystemClassDefault(enable); 2147 // -bootclasspath: 2148 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2149 scp_p->reset_path(tail); 2150 *scp_assembly_required_p = true; 2151 // -bootclasspath/a: 2152 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2153 scp_p->add_suffix(tail); 2154 *scp_assembly_required_p = true; 2155 // -bootclasspath/p: 2156 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2157 scp_p->add_prefix(tail); 2158 *scp_assembly_required_p = true; 2159 // -Xrun 2160 } else if (match_option(option, "-Xrun", &tail)) { 2161 if (tail != NULL) { 2162 const char* pos = strchr(tail, ':'); 2163 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2164 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2165 name[len] = '\0'; 2166 2167 char *options = NULL; 2168 if(pos != NULL) { 2169 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2170 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 2171 } 2172 #ifdef JVMTI_KERNEL 2173 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2174 warning("profiling and debugging agents are not supported with Kernel VM"); 2175 } else 2176 #endif // JVMTI_KERNEL 2177 add_init_library(name, options); 2178 } 2179 // -agentlib and -agentpath 2180 } else if (match_option(option, "-agentlib:", &tail) || 2181 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2182 if(tail != NULL) { 2183 const char* pos = strchr(tail, '='); 2184 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2185 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2186 name[len] = '\0'; 2187 2188 char *options = NULL; 2189 if(pos != NULL) { 2190 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 2191 } 2192 #ifdef JVMTI_KERNEL 2193 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2194 warning("profiling and debugging agents are not supported with Kernel VM"); 2195 } else 2196 #endif // JVMTI_KERNEL 2197 add_init_agent(name, options, is_absolute_path); 2198 2199 } 2200 // -javaagent 2201 } else if (match_option(option, "-javaagent:", &tail)) { 2202 if(tail != NULL) { 2203 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 2204 add_init_agent("instrument", options, false); 2205 } 2206 // -Xnoclassgc 2207 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2208 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2209 // -Xincgc: i-CMS 2210 } else if (match_option(option, "-Xincgc", &tail)) { 2211 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2212 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2213 // -Xnoincgc: no i-CMS 2214 } else if (match_option(option, "-Xnoincgc", &tail)) { 2215 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2216 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2217 // -Xconcgc 2218 } else if (match_option(option, "-Xconcgc", &tail)) { 2219 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2220 // -Xnoconcgc 2221 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2222 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2223 // -Xbatch 2224 } else if (match_option(option, "-Xbatch", &tail)) { 2225 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2226 // -Xmn for compatibility with other JVM vendors 2227 } else if (match_option(option, "-Xmn", &tail)) { 2228 julong long_initial_eden_size = 0; 2229 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2230 if (errcode != arg_in_range) { 2231 jio_fprintf(defaultStream::error_stream(), 2232 "Invalid initial eden size: %s\n", option->optionString); 2233 describe_range_error(errcode); 2234 return JNI_EINVAL; 2235 } 2236 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2237 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2238 // -Xms 2239 } else if (match_option(option, "-Xms", &tail)) { 2240 julong long_initial_heap_size = 0; 2241 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2242 if (errcode != arg_in_range) { 2243 jio_fprintf(defaultStream::error_stream(), 2244 "Invalid initial heap size: %s\n", option->optionString); 2245 describe_range_error(errcode); 2246 return JNI_EINVAL; 2247 } 2248 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2249 // Currently the minimum size and the initial heap sizes are the same. 2250 set_min_heap_size(InitialHeapSize); 2251 // -Xmx 2252 } else if (match_option(option, "-Xmx", &tail)) { 2253 julong long_max_heap_size = 0; 2254 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2255 if (errcode != arg_in_range) { 2256 jio_fprintf(defaultStream::error_stream(), 2257 "Invalid maximum heap size: %s\n", option->optionString); 2258 describe_range_error(errcode); 2259 return JNI_EINVAL; 2260 } 2261 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2262 // Xmaxf 2263 } else if (match_option(option, "-Xmaxf", &tail)) { 2264 int maxf = (int)(atof(tail) * 100); 2265 if (maxf < 0 || maxf > 100) { 2266 jio_fprintf(defaultStream::error_stream(), 2267 "Bad max heap free percentage size: %s\n", 2268 option->optionString); 2269 return JNI_EINVAL; 2270 } else { 2271 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2272 } 2273 // Xminf 2274 } else if (match_option(option, "-Xminf", &tail)) { 2275 int minf = (int)(atof(tail) * 100); 2276 if (minf < 0 || minf > 100) { 2277 jio_fprintf(defaultStream::error_stream(), 2278 "Bad min heap free percentage size: %s\n", 2279 option->optionString); 2280 return JNI_EINVAL; 2281 } else { 2282 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2283 } 2284 // -Xss 2285 } else if (match_option(option, "-Xss", &tail)) { 2286 julong long_ThreadStackSize = 0; 2287 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2288 if (errcode != arg_in_range) { 2289 jio_fprintf(defaultStream::error_stream(), 2290 "Invalid thread stack size: %s\n", option->optionString); 2291 describe_range_error(errcode); 2292 return JNI_EINVAL; 2293 } 2294 // Internally track ThreadStackSize in units of 1024 bytes. 2295 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2296 round_to((int)long_ThreadStackSize, K) / K); 2297 // -Xoss 2298 } else if (match_option(option, "-Xoss", &tail)) { 2299 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2300 // -Xmaxjitcodesize 2301 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2302 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2303 julong long_ReservedCodeCacheSize = 0; 2304 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2305 (size_t)InitialCodeCacheSize); 2306 if (errcode != arg_in_range) { 2307 jio_fprintf(defaultStream::error_stream(), 2308 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2309 option->optionString, InitialCodeCacheSize/K); 2310 describe_range_error(errcode); 2311 return JNI_EINVAL; 2312 } 2313 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2314 // -green 2315 } else if (match_option(option, "-green", &tail)) { 2316 jio_fprintf(defaultStream::error_stream(), 2317 "Green threads support not available\n"); 2318 return JNI_EINVAL; 2319 // -native 2320 } else if (match_option(option, "-native", &tail)) { 2321 // HotSpot always uses native threads, ignore silently for compatibility 2322 // -Xsqnopause 2323 } else if (match_option(option, "-Xsqnopause", &tail)) { 2324 // EVM option, ignore silently for compatibility 2325 // -Xrs 2326 } else if (match_option(option, "-Xrs", &tail)) { 2327 // Classic/EVM option, new functionality 2328 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2329 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2330 // change default internal VM signals used - lower case for back compat 2331 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2332 // -Xoptimize 2333 } else if (match_option(option, "-Xoptimize", &tail)) { 2334 // EVM option, ignore silently for compatibility 2335 // -Xprof 2336 } else if (match_option(option, "-Xprof", &tail)) { 2337 #ifndef FPROF_KERNEL 2338 _has_profile = true; 2339 #else // FPROF_KERNEL 2340 // do we have to exit? 2341 warning("Kernel VM does not support flat profiling."); 2342 #endif // FPROF_KERNEL 2343 // -Xaprof 2344 } else if (match_option(option, "-Xaprof", &tail)) { 2345 _has_alloc_profile = true; 2346 // -Xconcurrentio 2347 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2348 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2349 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2350 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2351 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2352 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2353 2354 // -Xinternalversion 2355 } else if (match_option(option, "-Xinternalversion", &tail)) { 2356 jio_fprintf(defaultStream::output_stream(), "%s\n", 2357 VM_Version::internal_vm_info_string()); 2358 vm_exit(0); 2359 #ifndef PRODUCT 2360 // -Xprintflags 2361 } else if (match_option(option, "-Xprintflags", &tail)) { 2362 CommandLineFlags::printFlags(tty, false); 2363 vm_exit(0); 2364 #endif 2365 // -D 2366 } else if (match_option(option, "-D", &tail)) { 2367 if (!add_property(tail)) { 2368 return JNI_ENOMEM; 2369 } 2370 // Out of the box management support 2371 if (match_option(option, "-Dcom.sun.management", &tail)) { 2372 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2373 } 2374 // -Xint 2375 } else if (match_option(option, "-Xint", &tail)) { 2376 set_mode_flags(_int); 2377 // -Xmixed 2378 } else if (match_option(option, "-Xmixed", &tail)) { 2379 set_mode_flags(_mixed); 2380 // -Xcomp 2381 } else if (match_option(option, "-Xcomp", &tail)) { 2382 // for testing the compiler; turn off all flags that inhibit compilation 2383 set_mode_flags(_comp); 2384 2385 // -Xshare:dump 2386 } else if (match_option(option, "-Xshare:dump", &tail)) { 2387 #ifdef TIERED 2388 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2389 set_mode_flags(_int); // Prevent compilation, which creates objects 2390 #elif defined(COMPILER2) 2391 vm_exit_during_initialization( 2392 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2393 #elif defined(KERNEL) 2394 vm_exit_during_initialization( 2395 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2396 #else 2397 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2398 set_mode_flags(_int); // Prevent compilation, which creates objects 2399 #endif 2400 // -Xshare:on 2401 } else if (match_option(option, "-Xshare:on", &tail)) { 2402 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2403 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2404 // -Xshare:auto 2405 } else if (match_option(option, "-Xshare:auto", &tail)) { 2406 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2407 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2408 // -Xshare:off 2409 } else if (match_option(option, "-Xshare:off", &tail)) { 2410 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2411 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2412 2413 // -Xverify 2414 } else if (match_option(option, "-Xverify", &tail)) { 2415 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2416 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2417 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2418 } else if (strcmp(tail, ":remote") == 0) { 2419 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2420 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2421 } else if (strcmp(tail, ":none") == 0) { 2422 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2423 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2424 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2425 return JNI_EINVAL; 2426 } 2427 // -Xdebug 2428 } else if (match_option(option, "-Xdebug", &tail)) { 2429 // note this flag has been used, then ignore 2430 set_xdebug_mode(true); 2431 // -Xnoagent 2432 } else if (match_option(option, "-Xnoagent", &tail)) { 2433 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2434 } else if (match_option(option, "-Xboundthreads", &tail)) { 2435 // Bind user level threads to kernel threads (Solaris only) 2436 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2437 } else if (match_option(option, "-Xloggc:", &tail)) { 2438 // Redirect GC output to the file. -Xloggc:<filename> 2439 // ostream_init_log(), when called will use this filename 2440 // to initialize a fileStream. 2441 _gc_log_filename = strdup(tail); 2442 FLAG_SET_CMDLINE(bool, PrintGC, true); 2443 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2444 2445 // JNI hooks 2446 } else if (match_option(option, "-Xcheck", &tail)) { 2447 if (!strcmp(tail, ":jni")) { 2448 CheckJNICalls = true; 2449 } else if (is_bad_option(option, args->ignoreUnrecognized, 2450 "check")) { 2451 return JNI_EINVAL; 2452 } 2453 } else if (match_option(option, "vfprintf", &tail)) { 2454 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2455 } else if (match_option(option, "exit", &tail)) { 2456 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2457 } else if (match_option(option, "abort", &tail)) { 2458 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2459 // -XX:+AggressiveHeap 2460 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2461 2462 // This option inspects the machine and attempts to set various 2463 // parameters to be optimal for long-running, memory allocation 2464 // intensive jobs. It is intended for machines with large 2465 // amounts of cpu and memory. 2466 2467 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2468 // VM, but we may not be able to represent the total physical memory 2469 // available (like having 8gb of memory on a box but using a 32bit VM). 2470 // Thus, we need to make sure we're using a julong for intermediate 2471 // calculations. 2472 julong initHeapSize; 2473 julong total_memory = os::physical_memory(); 2474 2475 if (total_memory < (julong)256*M) { 2476 jio_fprintf(defaultStream::error_stream(), 2477 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2478 vm_exit(1); 2479 } 2480 2481 // The heap size is half of available memory, or (at most) 2482 // all of possible memory less 160mb (leaving room for the OS 2483 // when using ISM). This is the maximum; because adaptive sizing 2484 // is turned on below, the actual space used may be smaller. 2485 2486 initHeapSize = MIN2(total_memory / (julong)2, 2487 total_memory - (julong)160*M); 2488 2489 // Make sure that if we have a lot of memory we cap the 32 bit 2490 // process space. The 64bit VM version of this function is a nop. 2491 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2492 2493 // The perm gen is separate but contiguous with the 2494 // object heap (and is reserved with it) so subtract it 2495 // from the heap size. 2496 if (initHeapSize > MaxPermSize) { 2497 initHeapSize = initHeapSize - MaxPermSize; 2498 } else { 2499 warning("AggressiveHeap and MaxPermSize values may conflict"); 2500 } 2501 2502 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2503 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2504 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2505 // Currently the minimum size and the initial heap sizes are the same. 2506 set_min_heap_size(initHeapSize); 2507 } 2508 if (FLAG_IS_DEFAULT(NewSize)) { 2509 // Make the young generation 3/8ths of the total heap. 2510 FLAG_SET_CMDLINE(uintx, NewSize, 2511 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2512 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2513 } 2514 2515 FLAG_SET_DEFAULT(UseLargePages, true); 2516 2517 // Increase some data structure sizes for efficiency 2518 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2519 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2520 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2521 2522 // See the OldPLABSize comment below, but replace 'after promotion' 2523 // with 'after copying'. YoungPLABSize is the size of the survivor 2524 // space per-gc-thread buffers. The default is 4kw. 2525 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2526 2527 // OldPLABSize is the size of the buffers in the old gen that 2528 // UseParallelGC uses to promote live data that doesn't fit in the 2529 // survivor spaces. At any given time, there's one for each gc thread. 2530 // The default size is 1kw. These buffers are rarely used, since the 2531 // survivor spaces are usually big enough. For specjbb, however, there 2532 // are occasions when there's lots of live data in the young gen 2533 // and we end up promoting some of it. We don't have a definite 2534 // explanation for why bumping OldPLABSize helps, but the theory 2535 // is that a bigger PLAB results in retaining something like the 2536 // original allocation order after promotion, which improves mutator 2537 // locality. A minor effect may be that larger PLABs reduce the 2538 // number of PLAB allocation events during gc. The value of 8kw 2539 // was arrived at by experimenting with specjbb. 2540 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2541 2542 // Enable parallel GC and adaptive generation sizing 2543 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2544 FLAG_SET_DEFAULT(ParallelGCThreads, 2545 Abstract_VM_Version::parallel_worker_threads()); 2546 2547 // Encourage steady state memory management 2548 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2549 2550 // This appears to improve mutator locality 2551 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2552 2553 // Get around early Solaris scheduling bug 2554 // (affinity vs other jobs on system) 2555 // but disallow DR and offlining (5008695). 2556 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2557 2558 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2559 // The last option must always win. 2560 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2561 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2562 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2563 // The last option must always win. 2564 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2565 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2566 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2567 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2568 jio_fprintf(defaultStream::error_stream(), 2569 "Please use CMSClassUnloadingEnabled in place of " 2570 "CMSPermGenSweepingEnabled in the future\n"); 2571 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2572 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2573 jio_fprintf(defaultStream::error_stream(), 2574 "Please use -XX:+UseGCOverheadLimit in place of " 2575 "-XX:+UseGCTimeLimit in the future\n"); 2576 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2577 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2578 jio_fprintf(defaultStream::error_stream(), 2579 "Please use -XX:-UseGCOverheadLimit in place of " 2580 "-XX:-UseGCTimeLimit in the future\n"); 2581 // The TLE options are for compatibility with 1.3 and will be 2582 // removed without notice in a future release. These options 2583 // are not to be documented. 2584 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2585 // No longer used. 2586 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2587 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2588 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2589 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2590 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2591 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2592 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2593 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2594 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2595 // No longer used. 2596 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2597 julong long_tlab_size = 0; 2598 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2599 if (errcode != arg_in_range) { 2600 jio_fprintf(defaultStream::error_stream(), 2601 "Invalid TLAB size: %s\n", option->optionString); 2602 describe_range_error(errcode); 2603 return JNI_EINVAL; 2604 } 2605 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2606 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2607 // No longer used. 2608 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2609 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2610 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2611 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2612 SOLARIS_ONLY( 2613 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2614 warning("-XX:+UsePermISM is obsolete."); 2615 FLAG_SET_CMDLINE(bool, UseISM, true); 2616 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2617 FLAG_SET_CMDLINE(bool, UseISM, false); 2618 ) 2619 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2620 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2621 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2622 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2623 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2624 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2625 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2626 #if defined(DTRACE_ENABLED) 2627 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2628 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2629 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2630 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2631 #else // defined(DTRACE_ENABLED) 2632 jio_fprintf(defaultStream::error_stream(), 2633 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2634 return JNI_EINVAL; 2635 #endif // defined(DTRACE_ENABLED) 2636 #ifdef ASSERT 2637 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2638 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2639 // disable scavenge before parallel mark-compact 2640 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2641 #endif 2642 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2643 julong cms_blocks_to_claim = (julong)atol(tail); 2644 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2645 jio_fprintf(defaultStream::error_stream(), 2646 "Please use -XX:OldPLABSize in place of " 2647 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2648 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2649 julong cms_blocks_to_claim = (julong)atol(tail); 2650 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2651 jio_fprintf(defaultStream::error_stream(), 2652 "Please use -XX:OldPLABSize in place of " 2653 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2654 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2655 julong old_plab_size = 0; 2656 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2657 if (errcode != arg_in_range) { 2658 jio_fprintf(defaultStream::error_stream(), 2659 "Invalid old PLAB size: %s\n", option->optionString); 2660 describe_range_error(errcode); 2661 return JNI_EINVAL; 2662 } 2663 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2664 jio_fprintf(defaultStream::error_stream(), 2665 "Please use -XX:OldPLABSize in place of " 2666 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2667 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2668 julong young_plab_size = 0; 2669 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2670 if (errcode != arg_in_range) { 2671 jio_fprintf(defaultStream::error_stream(), 2672 "Invalid young PLAB size: %s\n", option->optionString); 2673 describe_range_error(errcode); 2674 return JNI_EINVAL; 2675 } 2676 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2677 jio_fprintf(defaultStream::error_stream(), 2678 "Please use -XX:YoungPLABSize in place of " 2679 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2680 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2681 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2682 julong stack_size = 0; 2683 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2684 if (errcode != arg_in_range) { 2685 jio_fprintf(defaultStream::error_stream(), 2686 "Invalid mark stack size: %s\n", option->optionString); 2687 describe_range_error(errcode); 2688 return JNI_EINVAL; 2689 } 2690 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2691 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2692 julong max_stack_size = 0; 2693 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2694 if (errcode != arg_in_range) { 2695 jio_fprintf(defaultStream::error_stream(), 2696 "Invalid maximum mark stack size: %s\n", 2697 option->optionString); 2698 describe_range_error(errcode); 2699 return JNI_EINVAL; 2700 } 2701 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2702 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2703 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2704 uintx conc_threads = 0; 2705 if (!parse_uintx(tail, &conc_threads, 1)) { 2706 jio_fprintf(defaultStream::error_stream(), 2707 "Invalid concurrent threads: %s\n", option->optionString); 2708 return JNI_EINVAL; 2709 } 2710 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2711 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2712 // Skip -XX:Flags= since that case has already been handled 2713 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2714 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2715 return JNI_EINVAL; 2716 } 2717 } 2718 // Unknown option 2719 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2720 return JNI_ERR; 2721 } 2722 } 2723 2724 // Change the default value for flags which have different default values 2725 // when working with older JDKs. 2726 if (JDK_Version::current().compare_major(6) <= 0 && 2727 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2728 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2729 } 2730 #ifdef LINUX 2731 if (JDK_Version::current().compare_major(6) <= 0 && 2732 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2733 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2734 } 2735 #endif // LINUX 2736 return JNI_OK; 2737 } 2738 2739 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2740 // This must be done after all -D arguments have been processed. 2741 scp_p->expand_endorsed(); 2742 2743 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2744 // Assemble the bootclasspath elements into the final path. 2745 Arguments::set_sysclasspath(scp_p->combined_path()); 2746 } 2747 2748 // This must be done after all arguments have been processed. 2749 // java_compiler() true means set to "NONE" or empty. 2750 if (java_compiler() && !xdebug_mode()) { 2751 // For backwards compatibility, we switch to interpreted mode if 2752 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2753 // not specified. 2754 set_mode_flags(_int); 2755 } 2756 if (CompileThreshold == 0) { 2757 set_mode_flags(_int); 2758 } 2759 2760 #ifndef COMPILER2 2761 // Don't degrade server performance for footprint 2762 if (FLAG_IS_DEFAULT(UseLargePages) && 2763 MaxHeapSize < LargePageHeapSizeThreshold) { 2764 // No need for large granularity pages w/small heaps. 2765 // Note that large pages are enabled/disabled for both the 2766 // Java heap and the code cache. 2767 FLAG_SET_DEFAULT(UseLargePages, false); 2768 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2769 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2770 } 2771 2772 // Tiered compilation is undefined with C1. 2773 TieredCompilation = false; 2774 #else 2775 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2776 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2777 } 2778 #endif 2779 2780 // If we are running in a headless jre, force java.awt.headless property 2781 // to be true unless the property has already been set. 2782 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2783 if (os::is_headless_jre()) { 2784 const char* headless = Arguments::get_property("java.awt.headless"); 2785 if (headless == NULL) { 2786 char envbuffer[128]; 2787 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2788 if (!add_property("java.awt.headless=true")) { 2789 return JNI_ENOMEM; 2790 } 2791 } else { 2792 char buffer[256]; 2793 strcpy(buffer, "java.awt.headless="); 2794 strcat(buffer, envbuffer); 2795 if (!add_property(buffer)) { 2796 return JNI_ENOMEM; 2797 } 2798 } 2799 } 2800 } 2801 2802 if (!check_vm_args_consistency()) { 2803 return JNI_ERR; 2804 } 2805 2806 return JNI_OK; 2807 } 2808 2809 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2810 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2811 scp_assembly_required_p); 2812 } 2813 2814 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2815 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2816 scp_assembly_required_p); 2817 } 2818 2819 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2820 const int N_MAX_OPTIONS = 64; 2821 const int OPTION_BUFFER_SIZE = 1024; 2822 char buffer[OPTION_BUFFER_SIZE]; 2823 2824 // The variable will be ignored if it exceeds the length of the buffer. 2825 // Don't check this variable if user has special privileges 2826 // (e.g. unix su command). 2827 if (os::getenv(name, buffer, sizeof(buffer)) && 2828 !os::have_special_privileges()) { 2829 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2830 jio_fprintf(defaultStream::error_stream(), 2831 "Picked up %s: %s\n", name, buffer); 2832 char* rd = buffer; // pointer to the input string (rd) 2833 int i; 2834 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2835 while (isspace(*rd)) rd++; // skip whitespace 2836 if (*rd == 0) break; // we re done when the input string is read completely 2837 2838 // The output, option string, overwrites the input string. 2839 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2840 // input string (rd). 2841 char* wrt = rd; 2842 2843 options[i++].optionString = wrt; // Fill in option 2844 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2845 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2846 int quote = *rd; // matching quote to look for 2847 rd++; // don't copy open quote 2848 while (*rd != quote) { // include everything (even spaces) up until quote 2849 if (*rd == 0) { // string termination means unmatched string 2850 jio_fprintf(defaultStream::error_stream(), 2851 "Unmatched quote in %s\n", name); 2852 return JNI_ERR; 2853 } 2854 *wrt++ = *rd++; // copy to option string 2855 } 2856 rd++; // don't copy close quote 2857 } else { 2858 *wrt++ = *rd++; // copy to option string 2859 } 2860 } 2861 // Need to check if we're done before writing a NULL, 2862 // because the write could be to the byte that rd is pointing to. 2863 if (*rd++ == 0) { 2864 *wrt = 0; 2865 break; 2866 } 2867 *wrt = 0; // Zero terminate option 2868 } 2869 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2870 JavaVMInitArgs vm_args; 2871 vm_args.version = JNI_VERSION_1_2; 2872 vm_args.options = options; 2873 vm_args.nOptions = i; 2874 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2875 2876 if (PrintVMOptions) { 2877 const char* tail; 2878 for (int i = 0; i < vm_args.nOptions; i++) { 2879 const JavaVMOption *option = vm_args.options + i; 2880 if (match_option(option, "-XX:", &tail)) { 2881 logOption(tail); 2882 } 2883 } 2884 } 2885 2886 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2887 } 2888 return JNI_OK; 2889 } 2890 2891 void Arguments::set_shared_spaces_flags() { 2892 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 2893 const bool might_share = must_share || UseSharedSpaces; 2894 2895 // The string table is part of the shared archive so the size must match. 2896 if (!FLAG_IS_DEFAULT(StringTableSize)) { 2897 // Disable sharing. 2898 if (must_share) { 2899 warning("disabling shared archive %s because of non-default " 2900 "StringTableSize", DumpSharedSpaces ? "creation" : "use"); 2901 } 2902 if (might_share) { 2903 FLAG_SET_DEFAULT(DumpSharedSpaces, false); 2904 FLAG_SET_DEFAULT(RequireSharedSpaces, false); 2905 FLAG_SET_DEFAULT(UseSharedSpaces, false); 2906 } 2907 return; 2908 } 2909 2910 // Check whether class data sharing settings conflict with GC, compressed oops 2911 // or page size, and fix them up. Explicit sharing options override other 2912 // settings. 2913 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode || 2914 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC || 2915 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages); 2916 if (cannot_share) { 2917 if (must_share) { 2918 warning("selecting serial gc and disabling large pages %s" 2919 "because of %s", "" LP64_ONLY("and compressed oops "), 2920 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 2921 force_serial_gc(); 2922 FLAG_SET_CMDLINE(bool, UseLargePages, false); 2923 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 2924 } else { 2925 if (UseSharedSpaces && Verbose) { 2926 warning("turning off use of shared archive because of " 2927 "choice of garbage collector or large pages"); 2928 } 2929 no_shared_spaces(); 2930 } 2931 } else if (UseLargePages && might_share) { 2932 // Disable large pages to allow shared spaces. This is sub-optimal, since 2933 // there may not even be a shared archive to use. 2934 FLAG_SET_DEFAULT(UseLargePages, false); 2935 } 2936 } 2937 2938 // Disable options not supported in this release, with a warning if they 2939 // were explicitly requested on the command-line 2940 #define UNSUPPORTED_OPTION(opt, description) \ 2941 do { \ 2942 if (opt) { \ 2943 if (FLAG_IS_CMDLINE(opt)) { \ 2944 warning(description " is disabled in this release."); \ 2945 } \ 2946 FLAG_SET_DEFAULT(opt, false); \ 2947 } \ 2948 } while(0) 2949 2950 // Parse entry point called from JNI_CreateJavaVM 2951 2952 jint Arguments::parse(const JavaVMInitArgs* args) { 2953 2954 // Sharing support 2955 // Construct the path to the archive 2956 char jvm_path[JVM_MAXPATHLEN]; 2957 os::jvm_path(jvm_path, sizeof(jvm_path)); 2958 char *end = strrchr(jvm_path, *os::file_separator()); 2959 if (end != NULL) *end = '\0'; 2960 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2961 strlen(os::file_separator()) + 20); 2962 if (shared_archive_path == NULL) return JNI_ENOMEM; 2963 strcpy(shared_archive_path, jvm_path); 2964 strcat(shared_archive_path, os::file_separator()); 2965 strcat(shared_archive_path, "classes"); 2966 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2967 strcat(shared_archive_path, ".jsa"); 2968 SharedArchivePath = shared_archive_path; 2969 2970 // Remaining part of option string 2971 const char* tail; 2972 2973 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2974 bool settings_file_specified = false; 2975 const char* flags_file; 2976 int index; 2977 for (index = 0; index < args->nOptions; index++) { 2978 const JavaVMOption *option = args->options + index; 2979 if (match_option(option, "-XX:Flags=", &tail)) { 2980 flags_file = tail; 2981 settings_file_specified = true; 2982 } 2983 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2984 PrintVMOptions = true; 2985 } 2986 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2987 PrintVMOptions = false; 2988 } 2989 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2990 IgnoreUnrecognizedVMOptions = true; 2991 } 2992 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2993 IgnoreUnrecognizedVMOptions = false; 2994 } 2995 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 2996 CommandLineFlags::printFlags(tty, false); 2997 vm_exit(0); 2998 } 2999 3000 #ifndef PRODUCT 3001 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3002 CommandLineFlags::printFlags(tty, true); 3003 vm_exit(0); 3004 } 3005 #endif 3006 } 3007 3008 if (IgnoreUnrecognizedVMOptions) { 3009 // uncast const to modify the flag args->ignoreUnrecognized 3010 *(jboolean*)(&args->ignoreUnrecognized) = true; 3011 } 3012 3013 // Parse specified settings file 3014 if (settings_file_specified) { 3015 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3016 return JNI_EINVAL; 3017 } 3018 } 3019 3020 // Parse default .hotspotrc settings file 3021 if (!settings_file_specified) { 3022 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3023 return JNI_EINVAL; 3024 } 3025 } 3026 3027 if (PrintVMOptions) { 3028 for (index = 0; index < args->nOptions; index++) { 3029 const JavaVMOption *option = args->options + index; 3030 if (match_option(option, "-XX:", &tail)) { 3031 logOption(tail); 3032 } 3033 } 3034 } 3035 3036 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3037 jint result = parse_vm_init_args(args); 3038 if (result != JNI_OK) { 3039 return result; 3040 } 3041 3042 #ifdef JAVASE_EMBEDDED 3043 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3044 #endif 3045 3046 #ifndef PRODUCT 3047 if (TraceBytecodesAt != 0) { 3048 TraceBytecodes = true; 3049 } 3050 if (CountCompiledCalls) { 3051 if (UseCounterDecay) { 3052 warning("UseCounterDecay disabled because CountCalls is set"); 3053 UseCounterDecay = false; 3054 } 3055 } 3056 #endif // PRODUCT 3057 3058 // Transitional 3059 if (EnableMethodHandles || AnonymousClasses) { 3060 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3061 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled."); 3062 } else { 3063 EnableInvokeDynamic = true; 3064 } 3065 } 3066 3067 // JSR 292 is not supported before 1.7 3068 if (!JDK_Version::is_gte_jdk17x_version()) { 3069 if (EnableInvokeDynamic) { 3070 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3071 warning("JSR 292 is not supported before 1.7. Disabling support."); 3072 } 3073 EnableInvokeDynamic = false; 3074 } 3075 } 3076 3077 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3078 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3079 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3080 } 3081 ScavengeRootsInCode = 1; 3082 } 3083 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) { 3084 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3085 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false"); 3086 } 3087 ScavengeRootsInCode = 1; 3088 } 3089 3090 if (PrintGCDetails) { 3091 // Turn on -verbose:gc options as well 3092 PrintGC = true; 3093 } 3094 3095 // Set object alignment values. 3096 set_object_alignment(); 3097 3098 #ifdef SERIALGC 3099 force_serial_gc(); 3100 #endif // SERIALGC 3101 #ifdef KERNEL 3102 no_shared_spaces(); 3103 #endif // KERNEL 3104 3105 // Set flags based on ergonomics. 3106 set_ergonomics_flags(); 3107 3108 set_shared_spaces_flags(); 3109 3110 // Check the GC selections again. 3111 if (!check_gc_consistency()) { 3112 return JNI_EINVAL; 3113 } 3114 3115 if (TieredCompilation) { 3116 set_tiered_flags(); 3117 } else { 3118 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3119 if (CompilationPolicyChoice >= 2) { 3120 vm_exit_during_initialization( 3121 "Incompatible compilation policy selected", NULL); 3122 } 3123 } 3124 3125 #ifndef KERNEL 3126 // Set heap size based on available physical memory 3127 set_heap_size(); 3128 // Set per-collector flags 3129 if (UseParallelGC || UseParallelOldGC) { 3130 set_parallel_gc_flags(); 3131 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3132 set_cms_and_parnew_gc_flags(); 3133 } else if (UseParNewGC) { // skipped if CMS is set above 3134 set_parnew_gc_flags(); 3135 } else if (UseG1GC) { 3136 set_g1_gc_flags(); 3137 } 3138 #endif // KERNEL 3139 3140 #ifdef SERIALGC 3141 assert(verify_serial_gc_flags(), "SerialGC unset"); 3142 #endif // SERIALGC 3143 3144 // Set bytecode rewriting flags 3145 set_bytecode_flags(); 3146 3147 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3148 set_aggressive_opts_flags(); 3149 3150 // Turn off biased locking for locking debug mode flags, 3151 // which are subtlely different from each other but neither works with 3152 // biased locking. 3153 if (UseHeavyMonitors 3154 #ifdef COMPILER1 3155 || !UseFastLocking 3156 #endif // COMPILER1 3157 ) { 3158 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3159 // flag set to true on command line; warn the user that they 3160 // can't enable biased locking here 3161 warning("Biased Locking is not supported with locking debug flags" 3162 "; ignoring UseBiasedLocking flag." ); 3163 } 3164 UseBiasedLocking = false; 3165 } 3166 3167 #ifdef CC_INTERP 3168 // Clear flags not supported by the C++ interpreter 3169 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3170 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3171 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3172 #endif // CC_INTERP 3173 3174 #ifdef COMPILER2 3175 if (!UseBiasedLocking || EmitSync != 0) { 3176 UseOptoBiasInlining = false; 3177 } 3178 if (!EliminateLocks) { 3179 EliminateNestedLocks = false; 3180 } 3181 #endif 3182 3183 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3184 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3185 DebugNonSafepoints = true; 3186 } 3187 3188 #ifndef PRODUCT 3189 if (CompileTheWorld) { 3190 // Force NmethodSweeper to sweep whole CodeCache each time. 3191 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3192 NmethodSweepFraction = 1; 3193 } 3194 } 3195 #endif 3196 3197 if (PrintCommandLineFlags) { 3198 CommandLineFlags::printSetFlags(tty); 3199 } 3200 3201 // Apply CPU specific policy for the BiasedLocking 3202 if (UseBiasedLocking) { 3203 if (!VM_Version::use_biased_locking() && 3204 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3205 UseBiasedLocking = false; 3206 } 3207 } 3208 3209 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3210 // but only if not already set on the commandline 3211 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3212 bool set = false; 3213 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3214 if (!set) { 3215 FLAG_SET_DEFAULT(PauseAtExit, true); 3216 } 3217 } 3218 3219 return JNI_OK; 3220 } 3221 3222 int Arguments::PropertyList_count(SystemProperty* pl) { 3223 int count = 0; 3224 while(pl != NULL) { 3225 count++; 3226 pl = pl->next(); 3227 } 3228 return count; 3229 } 3230 3231 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3232 assert(key != NULL, "just checking"); 3233 SystemProperty* prop; 3234 for (prop = pl; prop != NULL; prop = prop->next()) { 3235 if (strcmp(key, prop->key()) == 0) return prop->value(); 3236 } 3237 return NULL; 3238 } 3239 3240 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3241 int count = 0; 3242 const char* ret_val = NULL; 3243 3244 while(pl != NULL) { 3245 if(count >= index) { 3246 ret_val = pl->key(); 3247 break; 3248 } 3249 count++; 3250 pl = pl->next(); 3251 } 3252 3253 return ret_val; 3254 } 3255 3256 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3257 int count = 0; 3258 char* ret_val = NULL; 3259 3260 while(pl != NULL) { 3261 if(count >= index) { 3262 ret_val = pl->value(); 3263 break; 3264 } 3265 count++; 3266 pl = pl->next(); 3267 } 3268 3269 return ret_val; 3270 } 3271 3272 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3273 SystemProperty* p = *plist; 3274 if (p == NULL) { 3275 *plist = new_p; 3276 } else { 3277 while (p->next() != NULL) { 3278 p = p->next(); 3279 } 3280 p->set_next(new_p); 3281 } 3282 } 3283 3284 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3285 if (plist == NULL) 3286 return; 3287 3288 SystemProperty* new_p = new SystemProperty(k, v, true); 3289 PropertyList_add(plist, new_p); 3290 } 3291 3292 // This add maintains unique property key in the list. 3293 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3294 if (plist == NULL) 3295 return; 3296 3297 // If property key exist then update with new value. 3298 SystemProperty* prop; 3299 for (prop = *plist; prop != NULL; prop = prop->next()) { 3300 if (strcmp(k, prop->key()) == 0) { 3301 if (append) { 3302 prop->append_value(v); 3303 } else { 3304 prop->set_value(v); 3305 } 3306 return; 3307 } 3308 } 3309 3310 PropertyList_add(plist, k, v); 3311 } 3312 3313 #ifdef KERNEL 3314 char *Arguments::get_kernel_properties() { 3315 // Find properties starting with kernel and append them to string 3316 // We need to find out how long they are first because the URL's that they 3317 // might point to could get long. 3318 int length = 0; 3319 SystemProperty* prop; 3320 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3321 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3322 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3323 } 3324 } 3325 // Add one for null terminator. 3326 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 3327 if (length != 0) { 3328 int pos = 0; 3329 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3330 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3331 jio_snprintf(&props[pos], length-pos, 3332 "-D%s=%s ", prop->key(), prop->value()); 3333 pos = strlen(props); 3334 } 3335 } 3336 } 3337 // null terminate props in case of null 3338 props[length] = '\0'; 3339 return props; 3340 } 3341 #endif // KERNEL 3342 3343 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3344 // Returns true if all of the source pointed by src has been copied over to 3345 // the destination buffer pointed by buf. Otherwise, returns false. 3346 // Notes: 3347 // 1. If the length (buflen) of the destination buffer excluding the 3348 // NULL terminator character is not long enough for holding the expanded 3349 // pid characters, it also returns false instead of returning the partially 3350 // expanded one. 3351 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3352 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3353 char* buf, size_t buflen) { 3354 const char* p = src; 3355 char* b = buf; 3356 const char* src_end = &src[srclen]; 3357 char* buf_end = &buf[buflen - 1]; 3358 3359 while (p < src_end && b < buf_end) { 3360 if (*p == '%') { 3361 switch (*(++p)) { 3362 case '%': // "%%" ==> "%" 3363 *b++ = *p++; 3364 break; 3365 case 'p': { // "%p" ==> current process id 3366 // buf_end points to the character before the last character so 3367 // that we could write '\0' to the end of the buffer. 3368 size_t buf_sz = buf_end - b + 1; 3369 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3370 3371 // if jio_snprintf fails or the buffer is not long enough to hold 3372 // the expanded pid, returns false. 3373 if (ret < 0 || ret >= (int)buf_sz) { 3374 return false; 3375 } else { 3376 b += ret; 3377 assert(*b == '\0', "fail in copy_expand_pid"); 3378 if (p == src_end && b == buf_end + 1) { 3379 // reach the end of the buffer. 3380 return true; 3381 } 3382 } 3383 p++; 3384 break; 3385 } 3386 default : 3387 *b++ = '%'; 3388 } 3389 } else { 3390 *b++ = *p++; 3391 } 3392 } 3393 *b = '\0'; 3394 return (p == src_end); // return false if not all of the source was copied 3395 }