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 "classfile/symbolTable.hpp" 28 #include "compiler/compilerOracle.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/cardTableRS.hpp" 31 #include "memory/referenceProcessor.hpp" 32 #include "memory/universe.inline.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "prims/jvmtiExport.hpp" 35 #include "runtime/arguments.hpp" 36 #include "runtime/globals_extension.hpp" 37 #include "runtime/java.hpp" 38 #include "services/management.hpp" 39 #include "services/memTracker.hpp" 40 #include "utilities/defaultStream.hpp" 41 #include "utilities/taskqueue.hpp" 42 #ifdef TARGET_OS_FAMILY_linux 43 # include "os_linux.inline.hpp" 44 #endif 45 #ifdef TARGET_OS_FAMILY_solaris 46 # include "os_solaris.inline.hpp" 47 #endif 48 #ifdef TARGET_OS_FAMILY_windows 49 # include "os_windows.inline.hpp" 50 #endif 51 #ifdef TARGET_OS_FAMILY_bsd 52 # include "os_bsd.inline.hpp" 53 #endif 54 #ifndef SERIALGC 55 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 56 #endif 57 58 // Note: This is a special bug reporting site for the JVM 59 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 60 #define DEFAULT_JAVA_LAUNCHER "generic" 61 62 char** Arguments::_jvm_flags_array = NULL; 63 int Arguments::_num_jvm_flags = 0; 64 char** Arguments::_jvm_args_array = NULL; 65 int Arguments::_num_jvm_args = 0; 66 char* Arguments::_java_command = NULL; 67 SystemProperty* Arguments::_system_properties = NULL; 68 const char* Arguments::_gc_log_filename = NULL; 69 bool Arguments::_has_profile = false; 70 bool Arguments::_has_alloc_profile = false; 71 uintx Arguments::_min_heap_size = 0; 72 Arguments::Mode Arguments::_mode = _mixed; 73 bool Arguments::_java_compiler = false; 74 bool Arguments::_xdebug_mode = false; 75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 77 int Arguments::_sun_java_launcher_pid = -1; 78 bool Arguments::_created_by_gamma_launcher = false; 79 80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 83 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 84 bool Arguments::_ClipInlining = ClipInlining; 85 86 char* Arguments::SharedArchivePath = NULL; 87 88 AgentLibraryList Arguments::_libraryList; 89 AgentLibraryList Arguments::_agentList; 90 91 abort_hook_t Arguments::_abort_hook = NULL; 92 exit_hook_t Arguments::_exit_hook = NULL; 93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 94 95 96 SystemProperty *Arguments::_java_ext_dirs = NULL; 97 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 98 SystemProperty *Arguments::_sun_boot_library_path = NULL; 99 SystemProperty *Arguments::_java_library_path = NULL; 100 SystemProperty *Arguments::_java_home = NULL; 101 SystemProperty *Arguments::_java_class_path = NULL; 102 SystemProperty *Arguments::_sun_boot_class_path = NULL; 103 104 char* Arguments::_meta_index_path = NULL; 105 char* Arguments::_meta_index_dir = NULL; 106 107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 108 109 static bool match_option(const JavaVMOption *option, const char* name, 110 const char** tail) { 111 int len = (int)strlen(name); 112 if (strncmp(option->optionString, name, len) == 0) { 113 *tail = option->optionString + len; 114 return true; 115 } else { 116 return false; 117 } 118 } 119 120 static void logOption(const char* opt) { 121 if (PrintVMOptions) { 122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 123 } 124 } 125 126 // Process java launcher properties. 127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 128 // See if sun.java.launcher or sun.java.launcher.pid is defined. 129 // Must do this before setting up other system properties, 130 // as some of them may depend on launcher type. 131 for (int index = 0; index < args->nOptions; index++) { 132 const JavaVMOption* option = args->options + index; 133 const char* tail; 134 135 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 136 process_java_launcher_argument(tail, option->extraInfo); 137 continue; 138 } 139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 140 _sun_java_launcher_pid = atoi(tail); 141 continue; 142 } 143 } 144 } 145 146 // Initialize system properties key and value. 147 void Arguments::init_system_properties() { 148 149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 150 "Java Virtual Machine Specification", false)); 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 154 155 // following are JVMTI agent writeable properties. 156 // Properties values are set to NULL and they are 157 // os specific they are initialized in os::init_system_properties_values(). 158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 161 _java_library_path = new SystemProperty("java.library.path", NULL, true); 162 _java_home = new SystemProperty("java.home", NULL, true); 163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 164 165 _java_class_path = new SystemProperty("java.class.path", "", true); 166 167 // Add to System Property list. 168 PropertyList_add(&_system_properties, _java_ext_dirs); 169 PropertyList_add(&_system_properties, _java_endorsed_dirs); 170 PropertyList_add(&_system_properties, _sun_boot_library_path); 171 PropertyList_add(&_system_properties, _java_library_path); 172 PropertyList_add(&_system_properties, _java_home); 173 PropertyList_add(&_system_properties, _java_class_path); 174 PropertyList_add(&_system_properties, _sun_boot_class_path); 175 176 // Set OS specific system properties values 177 os::init_system_properties_values(); 178 } 179 180 181 // Update/Initialize System properties after JDK version number is known 182 void Arguments::init_version_specific_system_properties() { 183 enum { bufsz = 16 }; 184 char buffer[bufsz]; 185 const char* spec_vendor = "Sun Microsystems Inc."; 186 uint32_t spec_version = 0; 187 188 if (JDK_Version::is_gte_jdk17x_version()) { 189 spec_vendor = "Oracle Corporation"; 190 spec_version = JDK_Version::current().major_version(); 191 } 192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 193 194 PropertyList_add(&_system_properties, 195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 196 PropertyList_add(&_system_properties, 197 new SystemProperty("java.vm.specification.version", buffer, false)); 198 PropertyList_add(&_system_properties, 199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 200 } 201 202 /** 203 * Provide a slightly more user-friendly way of eliminating -XX flags. 204 * When a flag is eliminated, it can be added to this list in order to 205 * continue accepting this flag on the command-line, while issuing a warning 206 * and ignoring the value. Once the JDK version reaches the 'accept_until' 207 * limit, we flatly refuse to admit the existence of the flag. This allows 208 * a flag to die correctly over JDK releases using HSX. 209 */ 210 typedef struct { 211 const char* name; 212 JDK_Version obsoleted_in; // when the flag went away 213 JDK_Version accept_until; // which version to start denying the existence 214 } ObsoleteFlag; 215 216 static ObsoleteFlag obsolete_jvm_flags[] = { 217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 232 { "DefaultInitialRAMFraction", 233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 234 { "UseDepthFirstScavengeOrder", 235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 236 { "HandlePromotionFailure", 237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 238 { "MaxLiveObjectEvacuationRatio", 239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 241 { "UseParallelOldGCCompacting", 242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 243 { "UseParallelDensePrefixUpdate", 244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 245 { "UseParallelOldGCDensePrefix", 246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 262 #ifdef PRODUCT 263 { "DesiredMethodLimit", 264 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 265 #endif // PRODUCT 266 { NULL, JDK_Version(0), JDK_Version(0) } 267 }; 268 269 // Returns true if the flag is obsolete and fits into the range specified 270 // for being ignored. In the case that the flag is ignored, the 'version' 271 // value is filled in with the version number when the flag became 272 // obsolete so that that value can be displayed to the user. 273 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 274 int i = 0; 275 assert(version != NULL, "Must provide a version buffer"); 276 while (obsolete_jvm_flags[i].name != NULL) { 277 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 278 // <flag>=xxx form 279 // [-|+]<flag> form 280 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 281 ((s[0] == '+' || s[0] == '-') && 282 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 283 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 284 *version = flag_status.obsoleted_in; 285 return true; 286 } 287 } 288 i++; 289 } 290 return false; 291 } 292 293 // Constructs the system class path (aka boot class path) from the following 294 // components, in order: 295 // 296 // prefix // from -Xbootclasspath/p:... 297 // endorsed // the expansion of -Djava.endorsed.dirs=... 298 // base // from os::get_system_properties() or -Xbootclasspath= 299 // suffix // from -Xbootclasspath/a:... 300 // 301 // java.endorsed.dirs is a list of directories; any jar or zip files in the 302 // directories are added to the sysclasspath just before the base. 303 // 304 // This could be AllStatic, but it isn't needed after argument processing is 305 // complete. 306 class SysClassPath: public StackObj { 307 public: 308 SysClassPath(const char* base); 309 ~SysClassPath(); 310 311 inline void set_base(const char* base); 312 inline void add_prefix(const char* prefix); 313 inline void add_suffix_to_prefix(const char* suffix); 314 inline void add_suffix(const char* suffix); 315 inline void reset_path(const char* base); 316 317 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 318 // property. Must be called after all command-line arguments have been 319 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 320 // combined_path(). 321 void expand_endorsed(); 322 323 inline const char* get_base() const { return _items[_scp_base]; } 324 inline const char* get_prefix() const { return _items[_scp_prefix]; } 325 inline const char* get_suffix() const { return _items[_scp_suffix]; } 326 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 327 328 // Combine all the components into a single c-heap-allocated string; caller 329 // must free the string if/when no longer needed. 330 char* combined_path(); 331 332 private: 333 // Utility routines. 334 static char* add_to_path(const char* path, const char* str, bool prepend); 335 static char* add_jars_to_path(char* path, const char* directory); 336 337 inline void reset_item_at(int index); 338 339 // Array indices for the items that make up the sysclasspath. All except the 340 // base are allocated in the C heap and freed by this class. 341 enum { 342 _scp_prefix, // from -Xbootclasspath/p:... 343 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 344 _scp_base, // the default sysclasspath 345 _scp_suffix, // from -Xbootclasspath/a:... 346 _scp_nitems // the number of items, must be last. 347 }; 348 349 const char* _items[_scp_nitems]; 350 DEBUG_ONLY(bool _expansion_done;) 351 }; 352 353 SysClassPath::SysClassPath(const char* base) { 354 memset(_items, 0, sizeof(_items)); 355 _items[_scp_base] = base; 356 DEBUG_ONLY(_expansion_done = false;) 357 } 358 359 SysClassPath::~SysClassPath() { 360 // Free everything except the base. 361 for (int i = 0; i < _scp_nitems; ++i) { 362 if (i != _scp_base) reset_item_at(i); 363 } 364 DEBUG_ONLY(_expansion_done = false;) 365 } 366 367 inline void SysClassPath::set_base(const char* base) { 368 _items[_scp_base] = base; 369 } 370 371 inline void SysClassPath::add_prefix(const char* prefix) { 372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 373 } 374 375 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 376 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 377 } 378 379 inline void SysClassPath::add_suffix(const char* suffix) { 380 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 381 } 382 383 inline void SysClassPath::reset_item_at(int index) { 384 assert(index < _scp_nitems && index != _scp_base, "just checking"); 385 if (_items[index] != NULL) { 386 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 387 _items[index] = NULL; 388 } 389 } 390 391 inline void SysClassPath::reset_path(const char* base) { 392 // Clear the prefix and suffix. 393 reset_item_at(_scp_prefix); 394 reset_item_at(_scp_suffix); 395 set_base(base); 396 } 397 398 //------------------------------------------------------------------------------ 399 400 void SysClassPath::expand_endorsed() { 401 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 402 403 const char* path = Arguments::get_property("java.endorsed.dirs"); 404 if (path == NULL) { 405 path = Arguments::get_endorsed_dir(); 406 assert(path != NULL, "no default for java.endorsed.dirs"); 407 } 408 409 char* expanded_path = NULL; 410 const char separator = *os::path_separator(); 411 const char* const end = path + strlen(path); 412 while (path < end) { 413 const char* tmp_end = strchr(path, separator); 414 if (tmp_end == NULL) { 415 expanded_path = add_jars_to_path(expanded_path, path); 416 path = end; 417 } else { 418 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 419 memcpy(dirpath, path, tmp_end - path); 420 dirpath[tmp_end - path] = '\0'; 421 expanded_path = add_jars_to_path(expanded_path, dirpath); 422 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 423 path = tmp_end + 1; 424 } 425 } 426 _items[_scp_endorsed] = expanded_path; 427 DEBUG_ONLY(_expansion_done = true;) 428 } 429 430 // Combine the bootclasspath elements, some of which may be null, into a single 431 // c-heap-allocated string. 432 char* SysClassPath::combined_path() { 433 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 434 assert(_expansion_done, "must call expand_endorsed() first."); 435 436 size_t lengths[_scp_nitems]; 437 size_t total_len = 0; 438 439 const char separator = *os::path_separator(); 440 441 // Get the lengths. 442 int i; 443 for (i = 0; i < _scp_nitems; ++i) { 444 if (_items[i] != NULL) { 445 lengths[i] = strlen(_items[i]); 446 // Include space for the separator char (or a NULL for the last item). 447 total_len += lengths[i] + 1; 448 } 449 } 450 assert(total_len > 0, "empty sysclasspath not allowed"); 451 452 // Copy the _items to a single string. 453 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 454 char* cp_tmp = cp; 455 for (i = 0; i < _scp_nitems; ++i) { 456 if (_items[i] != NULL) { 457 memcpy(cp_tmp, _items[i], lengths[i]); 458 cp_tmp += lengths[i]; 459 *cp_tmp++ = separator; 460 } 461 } 462 *--cp_tmp = '\0'; // Replace the extra separator. 463 return cp; 464 } 465 466 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 467 char* 468 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 469 char *cp; 470 471 assert(str != NULL, "just checking"); 472 if (path == NULL) { 473 size_t len = strlen(str) + 1; 474 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 475 memcpy(cp, str, len); // copy the trailing null 476 } else { 477 const char separator = *os::path_separator(); 478 size_t old_len = strlen(path); 479 size_t str_len = strlen(str); 480 size_t len = old_len + str_len + 2; 481 482 if (prepend) { 483 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 484 char* cp_tmp = cp; 485 memcpy(cp_tmp, str, str_len); 486 cp_tmp += str_len; 487 *cp_tmp = separator; 488 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 489 FREE_C_HEAP_ARRAY(char, path, mtInternal); 490 } else { 491 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 492 char* cp_tmp = cp + old_len; 493 *cp_tmp = separator; 494 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 495 } 496 } 497 return cp; 498 } 499 500 // Scan the directory and append any jar or zip files found to path. 501 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 502 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 503 DIR* dir = os::opendir(directory); 504 if (dir == NULL) return path; 505 506 char dir_sep[2] = { '\0', '\0' }; 507 size_t directory_len = strlen(directory); 508 const char fileSep = *os::file_separator(); 509 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 510 511 /* Scan the directory for jars/zips, appending them to path. */ 512 struct dirent *entry; 513 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 514 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 515 const char* name = entry->d_name; 516 const char* ext = name + strlen(name) - 4; 517 bool isJarOrZip = ext > name && 518 (os::file_name_strcmp(ext, ".jar") == 0 || 519 os::file_name_strcmp(ext, ".zip") == 0); 520 if (isJarOrZip) { 521 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 522 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 523 path = add_to_path(path, jarpath, false); 524 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 525 } 526 } 527 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 528 os::closedir(dir); 529 return path; 530 } 531 532 // Parses a memory size specification string. 533 static bool atomull(const char *s, julong* result) { 534 julong n = 0; 535 int args_read = sscanf(s, os::julong_format_specifier(), &n); 536 if (args_read != 1) { 537 return false; 538 } 539 while (*s != '\0' && isdigit(*s)) { 540 s++; 541 } 542 // 4705540: illegal if more characters are found after the first non-digit 543 if (strlen(s) > 1) { 544 return false; 545 } 546 switch (*s) { 547 case 'T': case 't': 548 *result = n * G * K; 549 // Check for overflow. 550 if (*result/((julong)G * K) != n) return false; 551 return true; 552 case 'G': case 'g': 553 *result = n * G; 554 if (*result/G != n) return false; 555 return true; 556 case 'M': case 'm': 557 *result = n * M; 558 if (*result/M != n) return false; 559 return true; 560 case 'K': case 'k': 561 *result = n * K; 562 if (*result/K != n) return false; 563 return true; 564 case '\0': 565 *result = n; 566 return true; 567 default: 568 return false; 569 } 570 } 571 572 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 573 if (size < min_size) return arg_too_small; 574 // Check that size will fit in a size_t (only relevant on 32-bit) 575 if (size > max_uintx) return arg_too_big; 576 return arg_in_range; 577 } 578 579 // Describe an argument out of range error 580 void Arguments::describe_range_error(ArgsRange errcode) { 581 switch(errcode) { 582 case arg_too_big: 583 jio_fprintf(defaultStream::error_stream(), 584 "The specified size exceeds the maximum " 585 "representable size.\n"); 586 break; 587 case arg_too_small: 588 case arg_unreadable: 589 case arg_in_range: 590 // do nothing for now 591 break; 592 default: 593 ShouldNotReachHere(); 594 } 595 } 596 597 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 598 return CommandLineFlags::boolAtPut(name, &value, origin); 599 } 600 601 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 602 double v; 603 if (sscanf(value, "%lf", &v) != 1) { 604 return false; 605 } 606 607 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 608 return true; 609 } 610 return false; 611 } 612 613 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 614 julong v; 615 intx intx_v; 616 bool is_neg = false; 617 // Check the sign first since atomull() parses only unsigned values. 618 if (*value == '-') { 619 if (!CommandLineFlags::intxAt(name, &intx_v)) { 620 return false; 621 } 622 value++; 623 is_neg = true; 624 } 625 if (!atomull(value, &v)) { 626 return false; 627 } 628 intx_v = (intx) v; 629 if (is_neg) { 630 intx_v = -intx_v; 631 } 632 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 633 return true; 634 } 635 uintx uintx_v = (uintx) v; 636 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 637 return true; 638 } 639 uint64_t uint64_t_v = (uint64_t) v; 640 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 641 return true; 642 } 643 return false; 644 } 645 646 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 647 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 648 // Contract: CommandLineFlags always returns a pointer that needs freeing. 649 FREE_C_HEAP_ARRAY(char, value, mtInternal); 650 return true; 651 } 652 653 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 654 const char* old_value = ""; 655 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 656 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 657 size_t new_len = strlen(new_value); 658 const char* value; 659 char* free_this_too = NULL; 660 if (old_len == 0) { 661 value = new_value; 662 } else if (new_len == 0) { 663 value = old_value; 664 } else { 665 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 666 // each new setting adds another LINE to the switch: 667 sprintf(buf, "%s\n%s", old_value, new_value); 668 value = buf; 669 free_this_too = buf; 670 } 671 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 672 // CommandLineFlags always returns a pointer that needs freeing. 673 FREE_C_HEAP_ARRAY(char, value, mtInternal); 674 if (free_this_too != NULL) { 675 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 676 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 677 } 678 return true; 679 } 680 681 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 682 683 // range of acceptable characters spelled out for portability reasons 684 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 685 #define BUFLEN 255 686 char name[BUFLEN+1]; 687 char dummy; 688 689 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 690 return set_bool_flag(name, false, origin); 691 } 692 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 693 return set_bool_flag(name, true, origin); 694 } 695 696 char punct; 697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 698 const char* value = strchr(arg, '=') + 1; 699 Flag* flag = Flag::find_flag(name, strlen(name)); 700 if (flag != NULL && flag->is_ccstr()) { 701 if (flag->ccstr_accumulates()) { 702 return append_to_string_flag(name, value, origin); 703 } else { 704 if (value[0] == '\0') { 705 value = NULL; 706 } 707 return set_string_flag(name, value, origin); 708 } 709 } 710 } 711 712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 713 const char* value = strchr(arg, '=') + 1; 714 // -XX:Foo:=xxx will reset the string flag to the given value. 715 if (value[0] == '\0') { 716 value = NULL; 717 } 718 return set_string_flag(name, value, origin); 719 } 720 721 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 722 #define SIGNED_NUMBER_RANGE "[-0123456789]" 723 #define NUMBER_RANGE "[0123456789]" 724 char value[BUFLEN + 1]; 725 char value2[BUFLEN + 1]; 726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 727 // Looks like a floating-point number -- try again with more lenient format string 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 729 return set_fp_numeric_flag(name, value, origin); 730 } 731 } 732 733 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 734 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 735 return set_numeric_flag(name, value, origin); 736 } 737 738 return false; 739 } 740 741 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 742 assert(bldarray != NULL, "illegal argument"); 743 744 if (arg == NULL) { 745 return; 746 } 747 748 int index = *count; 749 750 // expand the array and add arg to the last element 751 (*count)++; 752 if (*bldarray == NULL) { 753 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal); 754 } else { 755 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal); 756 } 757 (*bldarray)[index] = strdup(arg); 758 } 759 760 void Arguments::build_jvm_args(const char* arg) { 761 add_string(&_jvm_args_array, &_num_jvm_args, arg); 762 } 763 764 void Arguments::build_jvm_flags(const char* arg) { 765 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 766 } 767 768 // utility function to return a string that concatenates all 769 // strings in a given char** array 770 const char* Arguments::build_resource_string(char** args, int count) { 771 if (args == NULL || count == 0) { 772 return NULL; 773 } 774 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 775 for (int i = 1; i < count; i++) { 776 length += strlen(args[i]) + 1; // add 1 for a space 777 } 778 char* s = NEW_RESOURCE_ARRAY(char, length); 779 strcpy(s, args[0]); 780 for (int j = 1; j < count; j++) { 781 strcat(s, " "); 782 strcat(s, args[j]); 783 } 784 return (const char*) s; 785 } 786 787 void Arguments::print_on(outputStream* st) { 788 st->print_cr("VM Arguments:"); 789 if (num_jvm_flags() > 0) { 790 st->print("jvm_flags: "); print_jvm_flags_on(st); 791 } 792 if (num_jvm_args() > 0) { 793 st->print("jvm_args: "); print_jvm_args_on(st); 794 } 795 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 796 if (_java_class_path != NULL) { 797 char* path = _java_class_path->value(); 798 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 799 } 800 st->print_cr("Launcher Type: %s", _sun_java_launcher); 801 } 802 803 void Arguments::print_jvm_flags_on(outputStream* st) { 804 if (_num_jvm_flags > 0) { 805 for (int i=0; i < _num_jvm_flags; i++) { 806 st->print("%s ", _jvm_flags_array[i]); 807 } 808 st->print_cr(""); 809 } 810 } 811 812 void Arguments::print_jvm_args_on(outputStream* st) { 813 if (_num_jvm_args > 0) { 814 for (int i=0; i < _num_jvm_args; i++) { 815 st->print("%s ", _jvm_args_array[i]); 816 } 817 st->print_cr(""); 818 } 819 } 820 821 bool Arguments::process_argument(const char* arg, 822 jboolean ignore_unrecognized, FlagValueOrigin origin) { 823 824 JDK_Version since = JDK_Version(); 825 826 if (parse_argument(arg, origin) || ignore_unrecognized) { 827 return true; 828 } 829 830 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg; 831 if (is_newly_obsolete(arg, &since)) { 832 char version[256]; 833 since.to_string(version, sizeof(version)); 834 warning("ignoring option %s; support was removed in %s", argname, version); 835 return true; 836 } 837 838 // For locked flags, report a custom error message if available. 839 // Otherwise, report the standard unrecognized VM option. 840 841 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true); 842 if (locked_flag != NULL) { 843 char locked_message_buf[BUFLEN]; 844 locked_flag->get_locked_message(locked_message_buf, BUFLEN); 845 if (strlen(locked_message_buf) == 0) { 846 jio_fprintf(defaultStream::error_stream(), 847 "Unrecognized VM option '%s'\n", argname); 848 } else { 849 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 850 } 851 } else { 852 jio_fprintf(defaultStream::error_stream(), 853 "Unrecognized VM option '%s'\n", argname); 854 } 855 856 // allow for commandline "commenting out" options like -XX:#+Verbose 857 return arg[0] == '#'; 858 } 859 860 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 861 FILE* stream = fopen(file_name, "rb"); 862 if (stream == NULL) { 863 if (should_exist) { 864 jio_fprintf(defaultStream::error_stream(), 865 "Could not open settings file %s\n", file_name); 866 return false; 867 } else { 868 return true; 869 } 870 } 871 872 char token[1024]; 873 int pos = 0; 874 875 bool in_white_space = true; 876 bool in_comment = false; 877 bool in_quote = false; 878 char quote_c = 0; 879 bool result = true; 880 881 int c = getc(stream); 882 while(c != EOF && pos < (int)(sizeof(token)-1)) { 883 if (in_white_space) { 884 if (in_comment) { 885 if (c == '\n') in_comment = false; 886 } else { 887 if (c == '#') in_comment = true; 888 else if (!isspace(c)) { 889 in_white_space = false; 890 token[pos++] = c; 891 } 892 } 893 } else { 894 if (c == '\n' || (!in_quote && isspace(c))) { 895 // token ends at newline, or at unquoted whitespace 896 // this allows a way to include spaces in string-valued options 897 token[pos] = '\0'; 898 logOption(token); 899 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 900 build_jvm_flags(token); 901 pos = 0; 902 in_white_space = true; 903 in_quote = false; 904 } else if (!in_quote && (c == '\'' || c == '"')) { 905 in_quote = true; 906 quote_c = c; 907 } else if (in_quote && (c == quote_c)) { 908 in_quote = false; 909 } else { 910 token[pos++] = c; 911 } 912 } 913 c = getc(stream); 914 } 915 if (pos > 0) { 916 token[pos] = '\0'; 917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 918 build_jvm_flags(token); 919 } 920 fclose(stream); 921 return result; 922 } 923 924 //============================================================================================================= 925 // Parsing of properties (-D) 926 927 const char* Arguments::get_property(const char* key) { 928 return PropertyList_get_value(system_properties(), key); 929 } 930 931 bool Arguments::add_property(const char* prop) { 932 const char* eq = strchr(prop, '='); 933 char* key; 934 // ns must be static--its address may be stored in a SystemProperty object. 935 const static char ns[1] = {0}; 936 char* value = (char *)ns; 937 938 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 939 key = AllocateHeap(key_len + 1, mtInternal); 940 strncpy(key, prop, key_len); 941 key[key_len] = '\0'; 942 943 if (eq != NULL) { 944 size_t value_len = strlen(prop) - key_len - 1; 945 value = AllocateHeap(value_len + 1, mtInternal); 946 strncpy(value, &prop[key_len + 1], value_len + 1); 947 } 948 949 if (strcmp(key, "java.compiler") == 0) { 950 process_java_compiler_argument(value); 951 FreeHeap(key); 952 if (eq != NULL) { 953 FreeHeap(value); 954 } 955 return true; 956 } else if (strcmp(key, "sun.java.command") == 0) { 957 _java_command = value; 958 959 // Record value in Arguments, but let it get passed to Java. 960 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 961 // launcher.pid property is private and is processed 962 // in process_sun_java_launcher_properties(); 963 // the sun.java.launcher property is passed on to the java application 964 FreeHeap(key); 965 if (eq != NULL) { 966 FreeHeap(value); 967 } 968 return true; 969 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 970 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 971 // its value without going through the property list or making a Java call. 972 _java_vendor_url_bug = value; 973 } else if (strcmp(key, "sun.boot.library.path") == 0) { 974 PropertyList_unique_add(&_system_properties, key, value, true); 975 return true; 976 } 977 // Create new property and add at the end of the list 978 PropertyList_unique_add(&_system_properties, key, value); 979 return true; 980 } 981 982 //=========================================================================================================== 983 // Setting int/mixed/comp mode flags 984 985 void Arguments::set_mode_flags(Mode mode) { 986 // Set up default values for all flags. 987 // If you add a flag to any of the branches below, 988 // add a default value for it here. 989 set_java_compiler(false); 990 _mode = mode; 991 992 // Ensure Agent_OnLoad has the correct initial values. 993 // This may not be the final mode; mode may change later in onload phase. 994 PropertyList_unique_add(&_system_properties, "java.vm.info", 995 (char*)VM_Version::vm_info_string(), false); 996 997 UseInterpreter = true; 998 UseCompiler = true; 999 UseLoopCounter = true; 1000 1001 #ifndef ZERO 1002 // Turn these off for mixed and comp. Leave them on for Zero. 1003 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1004 UseFastAccessorMethods = (mode == _int); 1005 } 1006 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1007 UseFastEmptyMethods = (mode == _int); 1008 } 1009 #endif 1010 1011 // Default values may be platform/compiler dependent - 1012 // use the saved values 1013 ClipInlining = Arguments::_ClipInlining; 1014 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1015 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1016 BackgroundCompilation = Arguments::_BackgroundCompilation; 1017 1018 // Change from defaults based on mode 1019 switch (mode) { 1020 default: 1021 ShouldNotReachHere(); 1022 break; 1023 case _int: 1024 UseCompiler = false; 1025 UseLoopCounter = false; 1026 AlwaysCompileLoopMethods = false; 1027 UseOnStackReplacement = false; 1028 break; 1029 case _mixed: 1030 // same as default 1031 break; 1032 case _comp: 1033 UseInterpreter = false; 1034 BackgroundCompilation = false; 1035 ClipInlining = false; 1036 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1037 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1038 // compile a level 4 (C2) and then continue executing it. 1039 if (TieredCompilation) { 1040 Tier3InvokeNotifyFreqLog = 0; 1041 Tier4InvocationThreshold = 0; 1042 } 1043 break; 1044 } 1045 } 1046 1047 // Conflict: required to use shared spaces (-Xshare:on), but 1048 // incompatible command line options were chosen. 1049 1050 static void no_shared_spaces() { 1051 if (RequireSharedSpaces) { 1052 jio_fprintf(defaultStream::error_stream(), 1053 "Class data sharing is inconsistent with other specified options.\n"); 1054 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1055 } else { 1056 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1057 } 1058 } 1059 1060 void Arguments::set_tiered_flags() { 1061 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1062 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1063 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1064 } 1065 if (CompilationPolicyChoice < 2) { 1066 vm_exit_during_initialization( 1067 "Incompatible compilation policy selected", NULL); 1068 } 1069 // Increase the code cache size - tiered compiles a lot more. 1070 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1071 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1072 } 1073 } 1074 1075 #if INCLUDE_ALTERNATE_GCS 1076 static void disable_adaptive_size_policy(const char* collector_name) { 1077 if (UseAdaptiveSizePolicy) { 1078 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1079 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1080 collector_name); 1081 } 1082 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1083 } 1084 } 1085 1086 void Arguments::set_parnew_gc_flags() { 1087 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1088 "control point invariant"); 1089 assert(UseParNewGC, "Error"); 1090 1091 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1092 disable_adaptive_size_policy("UseParNewGC"); 1093 1094 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1095 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1096 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1097 } else if (ParallelGCThreads == 0) { 1098 jio_fprintf(defaultStream::error_stream(), 1099 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1100 vm_exit(1); 1101 } 1102 1103 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1104 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1105 // we set them to 1024 and 1024. 1106 // See CR 6362902. 1107 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1108 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1109 } 1110 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1111 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1112 } 1113 1114 // AlwaysTenure flag should make ParNew promote all at first collection. 1115 // See CR 6362902. 1116 if (AlwaysTenure) { 1117 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1118 } 1119 // When using compressed oops, we use local overflow stacks, 1120 // rather than using a global overflow list chained through 1121 // the klass word of the object's pre-image. 1122 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1123 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1124 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1125 } 1126 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1127 } 1128 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1129 } 1130 1131 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1132 // sparc/solaris for certain applications, but would gain from 1133 // further optimization and tuning efforts, and would almost 1134 // certainly gain from analysis of platform and environment. 1135 void Arguments::set_cms_and_parnew_gc_flags() { 1136 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1137 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1138 1139 // If we are using CMS, we prefer to UseParNewGC, 1140 // unless explicitly forbidden. 1141 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1142 FLAG_SET_ERGO(bool, UseParNewGC, true); 1143 } 1144 1145 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1146 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1147 1148 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1149 // as needed. 1150 if (UseParNewGC) { 1151 set_parnew_gc_flags(); 1152 } 1153 1154 // MaxHeapSize is aligned down in collectorPolicy 1155 size_t max_heap = align_size_down(MaxHeapSize, 1156 CardTableRS::ct_max_alignment_constraint()); 1157 1158 // Now make adjustments for CMS 1159 intx tenuring_default = (intx)6; 1160 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1161 1162 // Preferred young gen size for "short" pauses: 1163 // upper bound depends on # of threads and NewRatio. 1164 const uintx parallel_gc_threads = 1165 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1166 const size_t preferred_max_new_size_unaligned = 1167 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1168 size_t preferred_max_new_size = 1169 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1170 1171 // Unless explicitly requested otherwise, size young gen 1172 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1173 1174 // If either MaxNewSize or NewRatio is set on the command line, 1175 // assume the user is trying to set the size of the young gen. 1176 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1177 1178 // Set MaxNewSize to our calculated preferred_max_new_size unless 1179 // NewSize was set on the command line and it is larger than 1180 // preferred_max_new_size. 1181 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1182 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1183 } else { 1184 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1185 } 1186 if (PrintGCDetails && Verbose) { 1187 // Too early to use gclog_or_tty 1188 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1189 } 1190 1191 // Code along this path potentially sets NewSize and OldSize 1192 1193 assert(max_heap >= InitialHeapSize, "Error"); 1194 assert(max_heap >= NewSize, "Error"); 1195 1196 if (PrintGCDetails && Verbose) { 1197 // Too early to use gclog_or_tty 1198 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1199 " initial_heap_size: " SIZE_FORMAT 1200 " max_heap: " SIZE_FORMAT, 1201 min_heap_size(), InitialHeapSize, max_heap); 1202 } 1203 size_t min_new = preferred_max_new_size; 1204 if (FLAG_IS_CMDLINE(NewSize)) { 1205 min_new = NewSize; 1206 } 1207 if (max_heap > min_new && min_heap_size() > min_new) { 1208 // Unless explicitly requested otherwise, make young gen 1209 // at least min_new, and at most preferred_max_new_size. 1210 if (FLAG_IS_DEFAULT(NewSize)) { 1211 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1212 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1213 if (PrintGCDetails && Verbose) { 1214 // Too early to use gclog_or_tty 1215 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1216 } 1217 } 1218 // Unless explicitly requested otherwise, size old gen 1219 // so it's NewRatio x of NewSize. 1220 if (FLAG_IS_DEFAULT(OldSize)) { 1221 if (max_heap > NewSize) { 1222 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1223 if (PrintGCDetails && Verbose) { 1224 // Too early to use gclog_or_tty 1225 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1226 } 1227 } 1228 } 1229 } 1230 } 1231 // Unless explicitly requested otherwise, definitely 1232 // promote all objects surviving "tenuring_default" scavenges. 1233 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1234 FLAG_IS_DEFAULT(SurvivorRatio)) { 1235 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1236 } 1237 // If we decided above (or user explicitly requested) 1238 // `promote all' (via MaxTenuringThreshold := 0), 1239 // prefer minuscule survivor spaces so as not to waste 1240 // space for (non-existent) survivors 1241 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1242 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1243 } 1244 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1245 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1246 // This is done in order to make ParNew+CMS configuration to work 1247 // with YoungPLABSize and OldPLABSize options. 1248 // See CR 6362902. 1249 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1250 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1251 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1252 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1253 // the value (either from the command line or ergonomics) of 1254 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1255 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1256 } else { 1257 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1258 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1259 // we'll let it to take precedence. 1260 jio_fprintf(defaultStream::error_stream(), 1261 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1262 " options are specified for the CMS collector." 1263 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1264 } 1265 } 1266 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1267 // OldPLAB sizing manually turned off: Use a larger default setting, 1268 // unless it was manually specified. This is because a too-low value 1269 // will slow down scavenges. 1270 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1271 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1272 } 1273 } 1274 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1275 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1276 // If either of the static initialization defaults have changed, note this 1277 // modification. 1278 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1279 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1280 } 1281 if (PrintGCDetails && Verbose) { 1282 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1283 MarkStackSize / K, MarkStackSizeMax / K); 1284 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1285 } 1286 } 1287 #endif // INCLUDE_ALTERNATE_GCS 1288 1289 void set_object_alignment() { 1290 // Object alignment. 1291 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1292 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1293 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1294 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1295 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1296 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1297 1298 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1299 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1300 1301 // Oop encoding heap max 1302 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1303 1304 #if INCLUDE_ALTERNATE_GCS 1305 // Set CMS global values 1306 CompactibleFreeListSpace::set_cms_values(); 1307 #endif // INCLUDE_ALTERNATE_GCS 1308 } 1309 1310 bool verify_object_alignment() { 1311 // Object alignment. 1312 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1313 jio_fprintf(defaultStream::error_stream(), 1314 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1315 (int)ObjectAlignmentInBytes); 1316 return false; 1317 } 1318 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1319 jio_fprintf(defaultStream::error_stream(), 1320 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1321 (int)ObjectAlignmentInBytes, BytesPerLong); 1322 return false; 1323 } 1324 // It does not make sense to have big object alignment 1325 // since a space lost due to alignment will be greater 1326 // then a saved space from compressed oops. 1327 if ((int)ObjectAlignmentInBytes > 256) { 1328 jio_fprintf(defaultStream::error_stream(), 1329 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1330 (int)ObjectAlignmentInBytes); 1331 return false; 1332 } 1333 // In case page size is very small. 1334 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1335 jio_fprintf(defaultStream::error_stream(), 1336 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1337 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1338 return false; 1339 } 1340 return true; 1341 } 1342 1343 inline uintx max_heap_for_compressed_oops() { 1344 // Avoid sign flip. 1345 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) { 1346 return 0; 1347 } 1348 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size()); 1349 NOT_LP64(ShouldNotReachHere(); return 0); 1350 } 1351 1352 bool Arguments::should_auto_select_low_pause_collector() { 1353 if (UseAutoGCSelectPolicy && 1354 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1355 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1356 if (PrintGCDetails) { 1357 // Cannot use gclog_or_tty yet. 1358 tty->print_cr("Automatic selection of the low pause collector" 1359 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1360 } 1361 return true; 1362 } 1363 return false; 1364 } 1365 1366 void Arguments::set_ergonomics_flags() { 1367 1368 if (os::is_server_class_machine()) { 1369 // If no other collector is requested explicitly, 1370 // let the VM select the collector based on 1371 // machine class and automatic selection policy. 1372 if (!UseSerialGC && 1373 !UseConcMarkSweepGC && 1374 !UseG1GC && 1375 !UseParNewGC && 1376 FLAG_IS_DEFAULT(UseParallelGC)) { 1377 if (should_auto_select_low_pause_collector()) { 1378 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1379 } else { 1380 FLAG_SET_ERGO(bool, UseParallelGC, true); 1381 } 1382 } 1383 // Shared spaces work fine with other GCs but causes bytecode rewriting 1384 // to be disabled, which hurts interpreter performance and decreases 1385 // server performance. On server class machines, keep the default 1386 // off unless it is asked for. Future work: either add bytecode rewriting 1387 // at link time, or rewrite bytecodes in non-shared methods. 1388 if (!DumpSharedSpaces && !RequireSharedSpaces) { 1389 no_shared_spaces(); 1390 } 1391 } 1392 1393 #ifndef ZERO 1394 #ifdef _LP64 1395 // Check that UseCompressedOops can be set with the max heap size allocated 1396 // by ergonomics. 1397 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1398 #if !defined(COMPILER1) || defined(TIERED) 1399 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1400 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1401 } 1402 #endif 1403 #ifdef _WIN64 1404 if (UseLargePages && UseCompressedOops) { 1405 // Cannot allocate guard pages for implicit checks in indexed addressing 1406 // mode, when large pages are specified on windows. 1407 // This flag could be switched ON if narrow oop base address is set to 0, 1408 // see code in Universe::initialize_heap(). 1409 Universe::set_narrow_oop_use_implicit_null_checks(false); 1410 } 1411 #endif // _WIN64 1412 } else { 1413 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1414 warning("Max heap size too large for Compressed Oops"); 1415 FLAG_SET_DEFAULT(UseCompressedOops, false); 1416 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1417 } 1418 } 1419 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1420 if (!UseCompressedOops) { 1421 if (UseCompressedKlassPointers) { 1422 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1423 } 1424 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1425 } else { 1426 // Turn on UseCompressedKlassPointers too 1427 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1428 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1429 } 1430 // Set the ClassMetaspaceSize to something that will not need to be 1431 // expanded, since it cannot be expanded. 1432 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) { 1433 // 100,000 classes seems like a good size, so 100M assumes around 1K 1434 // per klass. The vtable and oopMap is embedded so we don't have a fixed 1435 // size per klass. Eventually, this will be parameterized because it 1436 // would also be useful to determine the optimal size of the 1437 // systemDictionary. 1438 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M); 1439 } 1440 } 1441 // Also checks that certain machines are slower with compressed oops 1442 // in vm_version initialization code. 1443 #endif // _LP64 1444 #endif // !ZERO 1445 } 1446 1447 void Arguments::set_parallel_gc_flags() { 1448 assert(UseParallelGC || UseParallelOldGC, "Error"); 1449 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1450 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1451 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1452 } 1453 FLAG_SET_DEFAULT(UseParallelGC, true); 1454 1455 // If no heap maximum was requested explicitly, use some reasonable fraction 1456 // of the physical memory, up to a maximum of 1GB. 1457 FLAG_SET_DEFAULT(ParallelGCThreads, 1458 Abstract_VM_Version::parallel_worker_threads()); 1459 if (ParallelGCThreads == 0) { 1460 jio_fprintf(defaultStream::error_stream(), 1461 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1462 vm_exit(1); 1463 } 1464 1465 1466 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1467 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1468 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1469 // See CR 6362902 for details. 1470 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1471 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1472 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1473 } 1474 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1475 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1476 } 1477 } 1478 1479 if (UseParallelOldGC) { 1480 // Par compact uses lower default values since they are treated as 1481 // minimums. These are different defaults because of the different 1482 // interpretation and are not ergonomically set. 1483 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1484 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1485 } 1486 } 1487 } 1488 1489 void Arguments::set_g1_gc_flags() { 1490 assert(UseG1GC, "Error"); 1491 #ifdef COMPILER1 1492 FastTLABRefill = false; 1493 #endif 1494 FLAG_SET_DEFAULT(ParallelGCThreads, 1495 Abstract_VM_Version::parallel_worker_threads()); 1496 if (ParallelGCThreads == 0) { 1497 FLAG_SET_DEFAULT(ParallelGCThreads, 1498 Abstract_VM_Version::parallel_worker_threads()); 1499 } 1500 1501 // MarkStackSize will be set (if it hasn't been set by the user) 1502 // when concurrent marking is initialized. 1503 // Its value will be based upon the number of parallel marking threads. 1504 // But we do set the maximum mark stack size here. 1505 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1506 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1507 } 1508 1509 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1510 // In G1, we want the default GC overhead goal to be higher than 1511 // say in PS. So we set it here to 10%. Otherwise the heap might 1512 // be expanded more aggressively than we would like it to. In 1513 // fact, even 10% seems to not be high enough in some cases 1514 // (especially small GC stress tests that the main thing they do 1515 // is allocation). We might consider increase it further. 1516 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1517 } 1518 1519 if (PrintGCDetails && Verbose) { 1520 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1521 MarkStackSize / K, MarkStackSizeMax / K); 1522 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1523 } 1524 } 1525 1526 void Arguments::set_heap_size() { 1527 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1528 // Deprecated flag 1529 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1530 } 1531 1532 const julong phys_mem = 1533 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1534 : (julong)MaxRAM; 1535 1536 // If the maximum heap size has not been set with -Xmx, 1537 // then set it as fraction of the size of physical memory, 1538 // respecting the maximum and minimum sizes of the heap. 1539 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1540 julong reasonable_max = phys_mem / MaxRAMFraction; 1541 1542 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1543 // Small physical memory, so use a minimum fraction of it for the heap 1544 reasonable_max = phys_mem / MinRAMFraction; 1545 } else { 1546 // Not-small physical memory, so require a heap at least 1547 // as large as MaxHeapSize 1548 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1549 } 1550 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1551 // Limit the heap size to ErgoHeapSizeLimit 1552 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1553 } 1554 if (UseCompressedOops) { 1555 // Limit the heap size to the maximum possible when using compressed oops 1556 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1557 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1558 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1559 // but it should be not less than default MaxHeapSize. 1560 max_coop_heap -= HeapBaseMinAddress; 1561 } 1562 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1563 } 1564 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1565 1566 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1567 // An initial heap size was specified on the command line, 1568 // so be sure that the maximum size is consistent. Done 1569 // after call to allocatable_physical_memory because that 1570 // method might reduce the allocation size. 1571 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1572 } 1573 1574 if (PrintGCDetails && Verbose) { 1575 // Cannot use gclog_or_tty yet. 1576 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1577 } 1578 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1579 } 1580 1581 // If the initial_heap_size has not been set with InitialHeapSize 1582 // or -Xms, then set it as fraction of the size of physical memory, 1583 // respecting the maximum and minimum sizes of the heap. 1584 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1585 julong reasonable_minimum = (julong)(OldSize + NewSize); 1586 1587 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1588 1589 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1590 1591 julong reasonable_initial = phys_mem / InitialRAMFraction; 1592 1593 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1594 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1595 1596 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1597 1598 if (PrintGCDetails && Verbose) { 1599 // Cannot use gclog_or_tty yet. 1600 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1601 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1602 } 1603 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1604 set_min_heap_size((uintx)reasonable_minimum); 1605 } 1606 } 1607 1608 // This must be called after ergonomics because we want bytecode rewriting 1609 // if the server compiler is used, or if UseSharedSpaces is disabled. 1610 void Arguments::set_bytecode_flags() { 1611 // Better not attempt to store into a read-only space. 1612 if (UseSharedSpaces) { 1613 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1614 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1615 } 1616 1617 if (!RewriteBytecodes) { 1618 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1619 } 1620 } 1621 1622 // Aggressive optimization flags -XX:+AggressiveOpts 1623 void Arguments::set_aggressive_opts_flags() { 1624 #ifdef COMPILER2 1625 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1626 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1627 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1628 } 1629 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1630 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1631 } 1632 1633 // Feed the cache size setting into the JDK 1634 char buffer[1024]; 1635 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1636 add_property(buffer); 1637 } 1638 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1639 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1640 } 1641 #endif 1642 1643 if (AggressiveOpts) { 1644 // Sample flag setting code 1645 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1646 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1647 // } 1648 } 1649 } 1650 1651 //=========================================================================================================== 1652 // Parsing of java.compiler property 1653 1654 void Arguments::process_java_compiler_argument(char* arg) { 1655 // For backwards compatibility, Djava.compiler=NONE or "" 1656 // causes us to switch to -Xint mode UNLESS -Xdebug 1657 // is also specified. 1658 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1659 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1660 } 1661 } 1662 1663 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1664 _sun_java_launcher = strdup(launcher); 1665 if (strcmp("gamma", _sun_java_launcher) == 0) { 1666 _created_by_gamma_launcher = true; 1667 } 1668 } 1669 1670 bool Arguments::created_by_java_launcher() { 1671 assert(_sun_java_launcher != NULL, "property must have value"); 1672 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1673 } 1674 1675 bool Arguments::created_by_gamma_launcher() { 1676 return _created_by_gamma_launcher; 1677 } 1678 1679 //=========================================================================================================== 1680 // Parsing of main arguments 1681 1682 bool Arguments::verify_interval(uintx val, uintx min, 1683 uintx max, const char* name) { 1684 // Returns true iff value is in the inclusive interval [min..max] 1685 // false, otherwise. 1686 if (val >= min && val <= max) { 1687 return true; 1688 } 1689 jio_fprintf(defaultStream::error_stream(), 1690 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1691 " and " UINTX_FORMAT "\n", 1692 name, val, min, max); 1693 return false; 1694 } 1695 1696 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1697 // Returns true if given value is at least specified min threshold 1698 // false, otherwise. 1699 if (val >= min ) { 1700 return true; 1701 } 1702 jio_fprintf(defaultStream::error_stream(), 1703 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1704 name, val, min); 1705 return false; 1706 } 1707 1708 bool Arguments::verify_percentage(uintx value, const char* name) { 1709 if (value <= 100) { 1710 return true; 1711 } 1712 jio_fprintf(defaultStream::error_stream(), 1713 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1714 name, value); 1715 return false; 1716 } 1717 1718 static void force_serial_gc() { 1719 FLAG_SET_DEFAULT(UseSerialGC, true); 1720 FLAG_SET_DEFAULT(UseParNewGC, false); 1721 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1722 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1723 FLAG_SET_DEFAULT(UseParallelGC, false); 1724 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1725 FLAG_SET_DEFAULT(UseG1GC, false); 1726 } 1727 1728 static bool verify_serial_gc_flags() { 1729 return (UseSerialGC && 1730 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1731 UseParallelGC || UseParallelOldGC)); 1732 } 1733 1734 // check if do gclog rotation 1735 // +UseGCLogFileRotation is a must, 1736 // no gc log rotation when log file not supplied or 1737 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1738 void check_gclog_consistency() { 1739 if (UseGCLogFileRotation) { 1740 if ((Arguments::gc_log_filename() == NULL) || 1741 (NumberOfGCLogFiles == 0) || 1742 (GCLogFileSize == 0)) { 1743 jio_fprintf(defaultStream::output_stream(), 1744 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1745 "where num_of_file > 0 and num_of_size > 0\n" 1746 "GC log rotation is turned off\n"); 1747 UseGCLogFileRotation = false; 1748 } 1749 } 1750 1751 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1752 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1753 jio_fprintf(defaultStream::output_stream(), 1754 "GCLogFileSize changed to minimum 8K\n"); 1755 } 1756 } 1757 1758 // Check consistency of GC selection 1759 bool Arguments::check_gc_consistency() { 1760 check_gclog_consistency(); 1761 bool status = true; 1762 // Ensure that the user has not selected conflicting sets 1763 // of collectors. [Note: this check is merely a user convenience; 1764 // collectors over-ride each other so that only a non-conflicting 1765 // set is selected; however what the user gets is not what they 1766 // may have expected from the combination they asked for. It's 1767 // better to reduce user confusion by not allowing them to 1768 // select conflicting combinations. 1769 uint i = 0; 1770 if (UseSerialGC) i++; 1771 if (UseConcMarkSweepGC || UseParNewGC) i++; 1772 if (UseParallelGC || UseParallelOldGC) i++; 1773 if (UseG1GC) i++; 1774 if (i > 1) { 1775 jio_fprintf(defaultStream::error_stream(), 1776 "Conflicting collector combinations in option list; " 1777 "please refer to the release notes for the combinations " 1778 "allowed\n"); 1779 status = false; 1780 } 1781 1782 return status; 1783 } 1784 1785 void Arguments::check_deprecated_gcs() { 1786 if (UseConcMarkSweepGC && !UseParNewGC) { 1787 warning("Using the DefNew young collector with the CMS collector is deprecated " 1788 "and will likely be removed in a future release"); 1789 } 1790 1791 if (UseParNewGC && !UseConcMarkSweepGC) { 1792 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1793 // set up UseSerialGC properly, so that can't be used in the check here. 1794 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1795 "and will likely be removed in a future release"); 1796 } 1797 1798 if (CMSIncrementalMode) { 1799 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1800 } 1801 } 1802 1803 // Check stack pages settings 1804 bool Arguments::check_stack_pages() 1805 { 1806 bool status = true; 1807 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1808 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1809 // greater stack shadow pages can't generate instruction to bang stack 1810 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1811 return status; 1812 } 1813 1814 // Check the consistency of vm_init_args 1815 bool Arguments::check_vm_args_consistency() { 1816 // Method for adding checks for flag consistency. 1817 // The intent is to warn the user of all possible conflicts, 1818 // before returning an error. 1819 // Note: Needs platform-dependent factoring. 1820 bool status = true; 1821 1822 #if ( (defined(COMPILER2) && defined(SPARC))) 1823 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1824 // on sparc doesn't require generation of a stub as is the case on, e.g., 1825 // x86. Normally, VM_Version_init must be called from init_globals in 1826 // init.cpp, which is called by the initial java thread *after* arguments 1827 // have been parsed. VM_Version_init gets called twice on sparc. 1828 extern void VM_Version_init(); 1829 VM_Version_init(); 1830 if (!VM_Version::has_v9()) { 1831 jio_fprintf(defaultStream::error_stream(), 1832 "V8 Machine detected, Server requires V9\n"); 1833 status = false; 1834 } 1835 #endif /* COMPILER2 && SPARC */ 1836 1837 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1838 // builds so the cost of stack banging can be measured. 1839 #if (defined(PRODUCT) && defined(SOLARIS)) 1840 if (!UseBoundThreads && !UseStackBanging) { 1841 jio_fprintf(defaultStream::error_stream(), 1842 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1843 1844 status = false; 1845 } 1846 #endif 1847 1848 if (TLABRefillWasteFraction == 0) { 1849 jio_fprintf(defaultStream::error_stream(), 1850 "TLABRefillWasteFraction should be a denominator, " 1851 "not " SIZE_FORMAT "\n", 1852 TLABRefillWasteFraction); 1853 status = false; 1854 } 1855 1856 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1857 "AdaptiveSizePolicyWeight"); 1858 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1859 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1860 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1861 1862 // Divide by bucket size to prevent a large size from causing rollover when 1863 // calculating amount of memory needed to be allocated for the String table. 1864 status = status && verify_interval(StringTableSize, defaultStringTableSize, 1865 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1866 1867 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1868 jio_fprintf(defaultStream::error_stream(), 1869 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1870 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1871 MinHeapFreeRatio, MaxHeapFreeRatio); 1872 status = false; 1873 } 1874 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1875 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1876 1877 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1878 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1879 } 1880 1881 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1882 // Settings to encourage splitting. 1883 if (!FLAG_IS_CMDLINE(NewRatio)) { 1884 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1885 } 1886 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1887 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1888 } 1889 } 1890 1891 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1892 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1893 if (GCTimeLimit == 100) { 1894 // Turn off gc-overhead-limit-exceeded checks 1895 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1896 } 1897 1898 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1899 1900 status = status && check_gc_consistency(); 1901 status = status && check_stack_pages(); 1902 1903 if (_has_alloc_profile) { 1904 if (UseParallelGC || UseParallelOldGC) { 1905 jio_fprintf(defaultStream::error_stream(), 1906 "error: invalid argument combination.\n" 1907 "Allocation profiling (-Xaprof) cannot be used together with " 1908 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1909 status = false; 1910 } 1911 if (UseConcMarkSweepGC) { 1912 jio_fprintf(defaultStream::error_stream(), 1913 "error: invalid argument combination.\n" 1914 "Allocation profiling (-Xaprof) cannot be used together with " 1915 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1916 status = false; 1917 } 1918 } 1919 1920 if (CMSIncrementalMode) { 1921 if (!UseConcMarkSweepGC) { 1922 jio_fprintf(defaultStream::error_stream(), 1923 "error: invalid argument combination.\n" 1924 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1925 "selected in order\nto use CMSIncrementalMode.\n"); 1926 status = false; 1927 } else { 1928 status = status && verify_percentage(CMSIncrementalDutyCycle, 1929 "CMSIncrementalDutyCycle"); 1930 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1931 "CMSIncrementalDutyCycleMin"); 1932 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1933 "CMSIncrementalSafetyFactor"); 1934 status = status && verify_percentage(CMSIncrementalOffset, 1935 "CMSIncrementalOffset"); 1936 status = status && verify_percentage(CMSExpAvgFactor, 1937 "CMSExpAvgFactor"); 1938 // If it was not set on the command line, set 1939 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1940 if (CMSInitiatingOccupancyFraction < 0) { 1941 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1942 } 1943 } 1944 } 1945 1946 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1947 // insists that we hold the requisite locks so that the iteration is 1948 // MT-safe. For the verification at start-up and shut-down, we don't 1949 // yet have a good way of acquiring and releasing these locks, 1950 // which are not visible at the CollectedHeap level. We want to 1951 // be able to acquire these locks and then do the iteration rather 1952 // than just disable the lock verification. This will be fixed under 1953 // bug 4788986. 1954 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1955 if (VerifyGCStartAt == 0) { 1956 warning("Heap verification at start-up disabled " 1957 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1958 VerifyGCStartAt = 1; // Disable verification at start-up 1959 } 1960 if (VerifyBeforeExit) { 1961 warning("Heap verification at shutdown disabled " 1962 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1963 VerifyBeforeExit = false; // Disable verification at shutdown 1964 } 1965 } 1966 1967 // Note: only executed in non-PRODUCT mode 1968 if (!UseAsyncConcMarkSweepGC && 1969 (ExplicitGCInvokesConcurrent || 1970 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1971 jio_fprintf(defaultStream::error_stream(), 1972 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1973 " with -UseAsyncConcMarkSweepGC"); 1974 status = false; 1975 } 1976 1977 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 1978 1979 #ifndef SERIALGC 1980 if (UseG1GC) { 1981 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1982 "InitiatingHeapOccupancyPercent"); 1983 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1984 "G1RefProcDrainInterval"); 1985 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1986 "G1ConcMarkStepDurationMillis"); 1987 } 1988 #endif 1989 1990 status = status && verify_interval(RefDiscoveryPolicy, 1991 ReferenceProcessor::DiscoveryPolicyMin, 1992 ReferenceProcessor::DiscoveryPolicyMax, 1993 "RefDiscoveryPolicy"); 1994 1995 // Limit the lower bound of this flag to 1 as it is used in a division 1996 // expression. 1997 status = status && verify_interval(TLABWasteTargetPercent, 1998 1, 100, "TLABWasteTargetPercent"); 1999 2000 status = status && verify_object_alignment(); 2001 2002 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 2003 "ClassMetaspaceSize"); 2004 2005 status = status && verify_interval(MarkStackSizeMax, 2006 1, (max_jint - 1), "MarkStackSizeMax"); 2007 2008 #ifdef SPARC 2009 if (UseConcMarkSweepGC || UseG1GC) { 2010 // Issue a stern warning if the user has explicitly set 2011 // UseMemSetInBOT (it is known to cause issues), but allow 2012 // use for experimentation and debugging. 2013 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2014 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2015 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2016 " on sun4v; please understand that you are using at your own risk!"); 2017 } 2018 } 2019 #endif // SPARC 2020 2021 if (PrintNMTStatistics) { 2022 #if INCLUDE_NMT 2023 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2024 #endif // INCLUDE_NMT 2025 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2026 PrintNMTStatistics = false; 2027 #if INCLUDE_NMT 2028 } 2029 #endif 2030 } 2031 2032 return status; 2033 } 2034 2035 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2036 const char* option_type) { 2037 if (ignore) return false; 2038 2039 const char* spacer = " "; 2040 if (option_type == NULL) { 2041 option_type = ++spacer; // Set both to the empty string. 2042 } 2043 2044 if (os::obsolete_option(option)) { 2045 jio_fprintf(defaultStream::error_stream(), 2046 "Obsolete %s%soption: %s\n", option_type, spacer, 2047 option->optionString); 2048 return false; 2049 } else { 2050 jio_fprintf(defaultStream::error_stream(), 2051 "Unrecognized %s%soption: %s\n", option_type, spacer, 2052 option->optionString); 2053 return true; 2054 } 2055 } 2056 2057 static const char* user_assertion_options[] = { 2058 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2059 }; 2060 2061 static const char* system_assertion_options[] = { 2062 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2063 }; 2064 2065 // Return true if any of the strings in null-terminated array 'names' matches. 2066 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2067 // the option must match exactly. 2068 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2069 bool tail_allowed) { 2070 for (/* empty */; *names != NULL; ++names) { 2071 if (match_option(option, *names, tail)) { 2072 if (**tail == '\0' || tail_allowed && **tail == ':') { 2073 return true; 2074 } 2075 } 2076 } 2077 return false; 2078 } 2079 2080 bool Arguments::parse_uintx(const char* value, 2081 uintx* uintx_arg, 2082 uintx min_size) { 2083 2084 // Check the sign first since atomull() parses only unsigned values. 2085 bool value_is_positive = !(*value == '-'); 2086 2087 if (value_is_positive) { 2088 julong n; 2089 bool good_return = atomull(value, &n); 2090 if (good_return) { 2091 bool above_minimum = n >= min_size; 2092 bool value_is_too_large = n > max_uintx; 2093 2094 if (above_minimum && !value_is_too_large) { 2095 *uintx_arg = n; 2096 return true; 2097 } 2098 } 2099 } 2100 return false; 2101 } 2102 2103 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2104 julong* long_arg, 2105 julong min_size) { 2106 if (!atomull(s, long_arg)) return arg_unreadable; 2107 return check_memory_size(*long_arg, min_size); 2108 } 2109 2110 // Parse JavaVMInitArgs structure 2111 2112 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2113 // For components of the system classpath. 2114 SysClassPath scp(Arguments::get_sysclasspath()); 2115 bool scp_assembly_required = false; 2116 2117 // Save default settings for some mode flags 2118 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2119 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2120 Arguments::_ClipInlining = ClipInlining; 2121 Arguments::_BackgroundCompilation = BackgroundCompilation; 2122 2123 // Setup flags for mixed which is the default 2124 set_mode_flags(_mixed); 2125 2126 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2127 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2128 if (result != JNI_OK) { 2129 return result; 2130 } 2131 2132 // Parse JavaVMInitArgs structure passed in 2133 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2134 if (result != JNI_OK) { 2135 return result; 2136 } 2137 2138 if (AggressiveOpts) { 2139 // Insert alt-rt.jar between user-specified bootclasspath 2140 // prefix and the default bootclasspath. os::set_boot_path() 2141 // uses meta_index_dir as the default bootclasspath directory. 2142 const char* altclasses_jar = "alt-rt.jar"; 2143 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2144 strlen(altclasses_jar); 2145 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2146 strcpy(altclasses_path, get_meta_index_dir()); 2147 strcat(altclasses_path, altclasses_jar); 2148 scp.add_suffix_to_prefix(altclasses_path); 2149 scp_assembly_required = true; 2150 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2151 } 2152 2153 if (WhiteBoxAPI) { 2154 // Append wb.jar to bootclasspath if enabled 2155 const char* wb_jar = "wb.jar"; 2156 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 + 2157 strlen(wb_jar); 2158 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal); 2159 strcpy(wb_path, get_meta_index_dir()); 2160 strcat(wb_path, wb_jar); 2161 scp.add_suffix(wb_path); 2162 scp_assembly_required = true; 2163 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal); 2164 } 2165 2166 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2167 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2168 if (result != JNI_OK) { 2169 return result; 2170 } 2171 2172 // Do final processing now that all arguments have been parsed 2173 result = finalize_vm_init_args(&scp, scp_assembly_required); 2174 if (result != JNI_OK) { 2175 return result; 2176 } 2177 2178 return JNI_OK; 2179 } 2180 2181 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2182 SysClassPath* scp_p, 2183 bool* scp_assembly_required_p, 2184 FlagValueOrigin origin) { 2185 // Remaining part of option string 2186 const char* tail; 2187 2188 // iterate over arguments 2189 for (int index = 0; index < args->nOptions; index++) { 2190 bool is_absolute_path = false; // for -agentpath vs -agentlib 2191 2192 const JavaVMOption* option = args->options + index; 2193 2194 if (!match_option(option, "-Djava.class.path", &tail) && 2195 !match_option(option, "-Dsun.java.command", &tail) && 2196 !match_option(option, "-Dsun.java.launcher", &tail)) { 2197 2198 // add all jvm options to the jvm_args string. This string 2199 // is used later to set the java.vm.args PerfData string constant. 2200 // the -Djava.class.path and the -Dsun.java.command options are 2201 // omitted from jvm_args string as each have their own PerfData 2202 // string constant object. 2203 build_jvm_args(option->optionString); 2204 } 2205 2206 // -verbose:[class/gc/jni] 2207 if (match_option(option, "-verbose", &tail)) { 2208 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2209 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2210 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2211 } else if (!strcmp(tail, ":gc")) { 2212 FLAG_SET_CMDLINE(bool, PrintGC, true); 2213 } else if (!strcmp(tail, ":jni")) { 2214 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2215 } 2216 // -da / -ea / -disableassertions / -enableassertions 2217 // These accept an optional class/package name separated by a colon, e.g., 2218 // -da:java.lang.Thread. 2219 } else if (match_option(option, user_assertion_options, &tail, true)) { 2220 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2221 if (*tail == '\0') { 2222 JavaAssertions::setUserClassDefault(enable); 2223 } else { 2224 assert(*tail == ':', "bogus match by match_option()"); 2225 JavaAssertions::addOption(tail + 1, enable); 2226 } 2227 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2228 } else if (match_option(option, system_assertion_options, &tail, false)) { 2229 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2230 JavaAssertions::setSystemClassDefault(enable); 2231 // -bootclasspath: 2232 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2233 scp_p->reset_path(tail); 2234 *scp_assembly_required_p = true; 2235 // -bootclasspath/a: 2236 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2237 scp_p->add_suffix(tail); 2238 *scp_assembly_required_p = true; 2239 // -bootclasspath/p: 2240 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2241 scp_p->add_prefix(tail); 2242 *scp_assembly_required_p = true; 2243 // -Xrun 2244 } else if (match_option(option, "-Xrun", &tail)) { 2245 if (tail != NULL) { 2246 const char* pos = strchr(tail, ':'); 2247 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2248 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2249 name[len] = '\0'; 2250 2251 char *options = NULL; 2252 if(pos != NULL) { 2253 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2254 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2255 } 2256 #if !INCLUDE_JVMTI 2257 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2258 warning("profiling and debugging agents are not supported in this VM"); 2259 } else 2260 #endif // !INCLUDE_JVMTI 2261 add_init_library(name, options); 2262 } 2263 // -agentlib and -agentpath 2264 } else if (match_option(option, "-agentlib:", &tail) || 2265 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2266 if(tail != NULL) { 2267 const char* pos = strchr(tail, '='); 2268 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2269 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2270 name[len] = '\0'; 2271 2272 char *options = NULL; 2273 if(pos != NULL) { 2274 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2275 } 2276 #if !INCLUDE_JVMTI 2277 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2278 warning("profiling and debugging agents are not supported in this VM"); 2279 } else 2280 #endif // !INCLUDE_JVMTI 2281 add_init_agent(name, options, is_absolute_path); 2282 2283 } 2284 // -javaagent 2285 } else if (match_option(option, "-javaagent:", &tail)) { 2286 #if !INCLUDE_JVMTI 2287 warning("Instrumentation agents are not supported in this VM"); 2288 #else 2289 if(tail != NULL) { 2290 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2291 add_init_agent("instrument", options, false); 2292 } 2293 #endif // !INCLUDE_JVMTI 2294 // -Xnoclassgc 2295 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2296 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2297 // -Xincgc: i-CMS 2298 } else if (match_option(option, "-Xincgc", &tail)) { 2299 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2300 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2301 // -Xnoincgc: no i-CMS 2302 } else if (match_option(option, "-Xnoincgc", &tail)) { 2303 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2304 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2305 // -Xconcgc 2306 } else if (match_option(option, "-Xconcgc", &tail)) { 2307 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2308 // -Xnoconcgc 2309 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2310 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2311 // -Xbatch 2312 } else if (match_option(option, "-Xbatch", &tail)) { 2313 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2314 // -Xmn for compatibility with other JVM vendors 2315 } else if (match_option(option, "-Xmn", &tail)) { 2316 julong long_initial_eden_size = 0; 2317 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2318 if (errcode != arg_in_range) { 2319 jio_fprintf(defaultStream::error_stream(), 2320 "Invalid initial eden size: %s\n", option->optionString); 2321 describe_range_error(errcode); 2322 return JNI_EINVAL; 2323 } 2324 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2325 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2326 // -Xms 2327 } else if (match_option(option, "-Xms", &tail)) { 2328 julong long_initial_heap_size = 0; 2329 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2330 if (errcode != arg_in_range) { 2331 jio_fprintf(defaultStream::error_stream(), 2332 "Invalid initial heap size: %s\n", option->optionString); 2333 describe_range_error(errcode); 2334 return JNI_EINVAL; 2335 } 2336 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2337 // Currently the minimum size and the initial heap sizes are the same. 2338 set_min_heap_size(InitialHeapSize); 2339 // -Xmx 2340 } else if (match_option(option, "-Xmx", &tail)) { 2341 julong long_max_heap_size = 0; 2342 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2343 if (errcode != arg_in_range) { 2344 jio_fprintf(defaultStream::error_stream(), 2345 "Invalid maximum heap size: %s\n", option->optionString); 2346 describe_range_error(errcode); 2347 return JNI_EINVAL; 2348 } 2349 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2350 // Xmaxf 2351 } else if (match_option(option, "-Xmaxf", &tail)) { 2352 int maxf = (int)(atof(tail) * 100); 2353 if (maxf < 0 || maxf > 100) { 2354 jio_fprintf(defaultStream::error_stream(), 2355 "Bad max heap free percentage size: %s\n", 2356 option->optionString); 2357 return JNI_EINVAL; 2358 } else { 2359 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2360 } 2361 // Xminf 2362 } else if (match_option(option, "-Xminf", &tail)) { 2363 int minf = (int)(atof(tail) * 100); 2364 if (minf < 0 || minf > 100) { 2365 jio_fprintf(defaultStream::error_stream(), 2366 "Bad min heap free percentage size: %s\n", 2367 option->optionString); 2368 return JNI_EINVAL; 2369 } else { 2370 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2371 } 2372 // -Xss 2373 } else if (match_option(option, "-Xss", &tail)) { 2374 julong long_ThreadStackSize = 0; 2375 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2376 if (errcode != arg_in_range) { 2377 jio_fprintf(defaultStream::error_stream(), 2378 "Invalid thread stack size: %s\n", option->optionString); 2379 describe_range_error(errcode); 2380 return JNI_EINVAL; 2381 } 2382 // Internally track ThreadStackSize in units of 1024 bytes. 2383 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2384 round_to((int)long_ThreadStackSize, K) / K); 2385 // -Xoss 2386 } else if (match_option(option, "-Xoss", &tail)) { 2387 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2388 // -Xmaxjitcodesize 2389 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2390 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2391 julong long_ReservedCodeCacheSize = 0; 2392 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2393 (size_t)InitialCodeCacheSize); 2394 if (errcode != arg_in_range) { 2395 jio_fprintf(defaultStream::error_stream(), 2396 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2397 option->optionString, InitialCodeCacheSize/K); 2398 describe_range_error(errcode); 2399 return JNI_EINVAL; 2400 } 2401 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2402 // -green 2403 } else if (match_option(option, "-green", &tail)) { 2404 jio_fprintf(defaultStream::error_stream(), 2405 "Green threads support not available\n"); 2406 return JNI_EINVAL; 2407 // -native 2408 } else if (match_option(option, "-native", &tail)) { 2409 // HotSpot always uses native threads, ignore silently for compatibility 2410 // -Xsqnopause 2411 } else if (match_option(option, "-Xsqnopause", &tail)) { 2412 // EVM option, ignore silently for compatibility 2413 // -Xrs 2414 } else if (match_option(option, "-Xrs", &tail)) { 2415 // Classic/EVM option, new functionality 2416 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2417 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2418 // change default internal VM signals used - lower case for back compat 2419 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2420 // -Xoptimize 2421 } else if (match_option(option, "-Xoptimize", &tail)) { 2422 // EVM option, ignore silently for compatibility 2423 // -Xprof 2424 } else if (match_option(option, "-Xprof", &tail)) { 2425 #if INCLUDE_FPROF 2426 _has_profile = true; 2427 #else // INCLUDE_FPROF 2428 // do we have to exit? 2429 warning("Flat profiling is not supported in this VM."); 2430 #endif // INCLUDE_FPROF 2431 // -Xaprof 2432 } else if (match_option(option, "-Xaprof", &tail)) { 2433 _has_alloc_profile = true; 2434 // -Xconcurrentio 2435 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2436 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2437 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2438 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2439 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2440 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2441 2442 // -Xinternalversion 2443 } else if (match_option(option, "-Xinternalversion", &tail)) { 2444 jio_fprintf(defaultStream::output_stream(), "%s\n", 2445 VM_Version::internal_vm_info_string()); 2446 vm_exit(0); 2447 #ifndef PRODUCT 2448 // -Xprintflags 2449 } else if (match_option(option, "-Xprintflags", &tail)) { 2450 CommandLineFlags::printFlags(tty, false); 2451 vm_exit(0); 2452 #endif 2453 // -D 2454 } else if (match_option(option, "-D", &tail)) { 2455 if (!add_property(tail)) { 2456 return JNI_ENOMEM; 2457 } 2458 // Out of the box management support 2459 if (match_option(option, "-Dcom.sun.management", &tail)) { 2460 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2461 } 2462 // -Xint 2463 } else if (match_option(option, "-Xint", &tail)) { 2464 set_mode_flags(_int); 2465 // -Xmixed 2466 } else if (match_option(option, "-Xmixed", &tail)) { 2467 set_mode_flags(_mixed); 2468 // -Xcomp 2469 } else if (match_option(option, "-Xcomp", &tail)) { 2470 // for testing the compiler; turn off all flags that inhibit compilation 2471 set_mode_flags(_comp); 2472 2473 // -Xshare:dump 2474 } else if (match_option(option, "-Xshare:dump", &tail)) { 2475 #if defined(KERNEL) 2476 vm_exit_during_initialization( 2477 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2478 #elif !INCLUDE_CDS 2479 vm_exit_during_initialization( 2480 "Dumping a shared archive is not supported in this VM.", NULL); 2481 #else 2482 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2483 set_mode_flags(_int); // Prevent compilation, which creates objects 2484 #endif 2485 // -Xshare:on 2486 } else if (match_option(option, "-Xshare:on", &tail)) { 2487 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2488 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2489 // -Xshare:auto 2490 } else if (match_option(option, "-Xshare:auto", &tail)) { 2491 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2492 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2493 // -Xshare:off 2494 } else if (match_option(option, "-Xshare:off", &tail)) { 2495 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2496 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2497 2498 // -Xverify 2499 } else if (match_option(option, "-Xverify", &tail)) { 2500 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2501 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2502 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2503 } else if (strcmp(tail, ":remote") == 0) { 2504 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2505 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2506 } else if (strcmp(tail, ":none") == 0) { 2507 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2508 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2509 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2510 return JNI_EINVAL; 2511 } 2512 // -Xdebug 2513 } else if (match_option(option, "-Xdebug", &tail)) { 2514 // note this flag has been used, then ignore 2515 set_xdebug_mode(true); 2516 // -Xnoagent 2517 } else if (match_option(option, "-Xnoagent", &tail)) { 2518 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2519 } else if (match_option(option, "-Xboundthreads", &tail)) { 2520 // Bind user level threads to kernel threads (Solaris only) 2521 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2522 } else if (match_option(option, "-Xloggc:", &tail)) { 2523 // Redirect GC output to the file. -Xloggc:<filename> 2524 // ostream_init_log(), when called will use this filename 2525 // to initialize a fileStream. 2526 _gc_log_filename = strdup(tail); 2527 FLAG_SET_CMDLINE(bool, PrintGC, true); 2528 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2529 2530 // JNI hooks 2531 } else if (match_option(option, "-Xcheck", &tail)) { 2532 if (!strcmp(tail, ":jni")) { 2533 #if !INCLUDE_JNI_CHECK 2534 warning("JNI CHECKING is not supported in this VM"); 2535 #else 2536 CheckJNICalls = true; 2537 #endif // INCLUDE_JNI_CHECK 2538 } else if (is_bad_option(option, args->ignoreUnrecognized, 2539 "check")) { 2540 return JNI_EINVAL; 2541 } 2542 } else if (match_option(option, "vfprintf", &tail)) { 2543 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2544 } else if (match_option(option, "exit", &tail)) { 2545 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2546 } else if (match_option(option, "abort", &tail)) { 2547 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2548 // -XX:+AggressiveHeap 2549 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2550 2551 // This option inspects the machine and attempts to set various 2552 // parameters to be optimal for long-running, memory allocation 2553 // intensive jobs. It is intended for machines with large 2554 // amounts of cpu and memory. 2555 2556 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2557 // VM, but we may not be able to represent the total physical memory 2558 // available (like having 8gb of memory on a box but using a 32bit VM). 2559 // Thus, we need to make sure we're using a julong for intermediate 2560 // calculations. 2561 julong initHeapSize; 2562 julong total_memory = os::physical_memory(); 2563 2564 if (total_memory < (julong)256*M) { 2565 jio_fprintf(defaultStream::error_stream(), 2566 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2567 vm_exit(1); 2568 } 2569 2570 // The heap size is half of available memory, or (at most) 2571 // all of possible memory less 160mb (leaving room for the OS 2572 // when using ISM). This is the maximum; because adaptive sizing 2573 // is turned on below, the actual space used may be smaller. 2574 2575 initHeapSize = MIN2(total_memory / (julong)2, 2576 total_memory - (julong)160*M); 2577 2578 // Make sure that if we have a lot of memory we cap the 32 bit 2579 // process space. The 64bit VM version of this function is a nop. 2580 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2581 2582 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2583 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2584 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2585 // Currently the minimum size and the initial heap sizes are the same. 2586 set_min_heap_size(initHeapSize); 2587 } 2588 if (FLAG_IS_DEFAULT(NewSize)) { 2589 // Make the young generation 3/8ths of the total heap. 2590 FLAG_SET_CMDLINE(uintx, NewSize, 2591 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2592 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2593 } 2594 2595 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2596 FLAG_SET_DEFAULT(UseLargePages, true); 2597 #endif 2598 2599 // Increase some data structure sizes for efficiency 2600 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2601 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2602 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2603 2604 // See the OldPLABSize comment below, but replace 'after promotion' 2605 // with 'after copying'. YoungPLABSize is the size of the survivor 2606 // space per-gc-thread buffers. The default is 4kw. 2607 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2608 2609 // OldPLABSize is the size of the buffers in the old gen that 2610 // UseParallelGC uses to promote live data that doesn't fit in the 2611 // survivor spaces. At any given time, there's one for each gc thread. 2612 // The default size is 1kw. These buffers are rarely used, since the 2613 // survivor spaces are usually big enough. For specjbb, however, there 2614 // are occasions when there's lots of live data in the young gen 2615 // and we end up promoting some of it. We don't have a definite 2616 // explanation for why bumping OldPLABSize helps, but the theory 2617 // is that a bigger PLAB results in retaining something like the 2618 // original allocation order after promotion, which improves mutator 2619 // locality. A minor effect may be that larger PLABs reduce the 2620 // number of PLAB allocation events during gc. The value of 8kw 2621 // was arrived at by experimenting with specjbb. 2622 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2623 2624 // Enable parallel GC and adaptive generation sizing 2625 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2626 FLAG_SET_DEFAULT(ParallelGCThreads, 2627 Abstract_VM_Version::parallel_worker_threads()); 2628 2629 // Encourage steady state memory management 2630 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2631 2632 // This appears to improve mutator locality 2633 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2634 2635 // Get around early Solaris scheduling bug 2636 // (affinity vs other jobs on system) 2637 // but disallow DR and offlining (5008695). 2638 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2639 2640 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2641 // The last option must always win. 2642 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2643 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2644 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2645 // The last option must always win. 2646 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2647 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2648 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2649 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2650 jio_fprintf(defaultStream::error_stream(), 2651 "Please use CMSClassUnloadingEnabled in place of " 2652 "CMSPermGenSweepingEnabled in the future\n"); 2653 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2654 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2655 jio_fprintf(defaultStream::error_stream(), 2656 "Please use -XX:+UseGCOverheadLimit in place of " 2657 "-XX:+UseGCTimeLimit in the future\n"); 2658 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2659 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2660 jio_fprintf(defaultStream::error_stream(), 2661 "Please use -XX:-UseGCOverheadLimit in place of " 2662 "-XX:-UseGCTimeLimit in the future\n"); 2663 // The TLE options are for compatibility with 1.3 and will be 2664 // removed without notice in a future release. These options 2665 // are not to be documented. 2666 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2667 // No longer used. 2668 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2669 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2670 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2671 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2672 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2673 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2674 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2675 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2676 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2677 // No longer used. 2678 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2679 julong long_tlab_size = 0; 2680 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2681 if (errcode != arg_in_range) { 2682 jio_fprintf(defaultStream::error_stream(), 2683 "Invalid TLAB size: %s\n", option->optionString); 2684 describe_range_error(errcode); 2685 return JNI_EINVAL; 2686 } 2687 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2688 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2689 // No longer used. 2690 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2691 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2692 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2693 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2694 SOLARIS_ONLY( 2695 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2696 warning("-XX:+UsePermISM is obsolete."); 2697 FLAG_SET_CMDLINE(bool, UseISM, true); 2698 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2699 FLAG_SET_CMDLINE(bool, UseISM, false); 2700 ) 2701 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2702 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2703 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2704 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2705 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2706 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2707 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2708 #if defined(DTRACE_ENABLED) 2709 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2710 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2711 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2712 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2713 #else // defined(DTRACE_ENABLED) 2714 jio_fprintf(defaultStream::error_stream(), 2715 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2716 return JNI_EINVAL; 2717 #endif // defined(DTRACE_ENABLED) 2718 #ifdef ASSERT 2719 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2720 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2721 // disable scavenge before parallel mark-compact 2722 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2723 #endif 2724 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2725 julong cms_blocks_to_claim = (julong)atol(tail); 2726 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2727 jio_fprintf(defaultStream::error_stream(), 2728 "Please use -XX:OldPLABSize in place of " 2729 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2730 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2731 julong cms_blocks_to_claim = (julong)atol(tail); 2732 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2733 jio_fprintf(defaultStream::error_stream(), 2734 "Please use -XX:OldPLABSize in place of " 2735 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2736 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2737 julong old_plab_size = 0; 2738 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2739 if (errcode != arg_in_range) { 2740 jio_fprintf(defaultStream::error_stream(), 2741 "Invalid old PLAB size: %s\n", option->optionString); 2742 describe_range_error(errcode); 2743 return JNI_EINVAL; 2744 } 2745 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2746 jio_fprintf(defaultStream::error_stream(), 2747 "Please use -XX:OldPLABSize in place of " 2748 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2749 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2750 julong young_plab_size = 0; 2751 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2752 if (errcode != arg_in_range) { 2753 jio_fprintf(defaultStream::error_stream(), 2754 "Invalid young PLAB size: %s\n", option->optionString); 2755 describe_range_error(errcode); 2756 return JNI_EINVAL; 2757 } 2758 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2759 jio_fprintf(defaultStream::error_stream(), 2760 "Please use -XX:YoungPLABSize in place of " 2761 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2762 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2763 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2764 julong stack_size = 0; 2765 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2766 if (errcode != arg_in_range) { 2767 jio_fprintf(defaultStream::error_stream(), 2768 "Invalid mark stack size: %s\n", option->optionString); 2769 describe_range_error(errcode); 2770 return JNI_EINVAL; 2771 } 2772 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2773 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2774 julong max_stack_size = 0; 2775 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2776 if (errcode != arg_in_range) { 2777 jio_fprintf(defaultStream::error_stream(), 2778 "Invalid maximum mark stack size: %s\n", 2779 option->optionString); 2780 describe_range_error(errcode); 2781 return JNI_EINVAL; 2782 } 2783 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2784 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2785 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2786 uintx conc_threads = 0; 2787 if (!parse_uintx(tail, &conc_threads, 1)) { 2788 jio_fprintf(defaultStream::error_stream(), 2789 "Invalid concurrent threads: %s\n", option->optionString); 2790 return JNI_EINVAL; 2791 } 2792 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2793 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 2794 julong max_direct_memory_size = 0; 2795 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 2796 if (errcode != arg_in_range) { 2797 jio_fprintf(defaultStream::error_stream(), 2798 "Invalid maximum direct memory size: %s\n", 2799 option->optionString); 2800 describe_range_error(errcode); 2801 return JNI_EINVAL; 2802 } 2803 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 2804 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 2805 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 2806 // away and will cause VM initialization failures! 2807 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 2808 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 2809 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2810 // Skip -XX:Flags= since that case has already been handled 2811 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2812 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2813 return JNI_EINVAL; 2814 } 2815 } 2816 // Unknown option 2817 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2818 return JNI_ERR; 2819 } 2820 } 2821 2822 // Change the default value for flags which have different default values 2823 // when working with older JDKs. 2824 #ifdef LINUX 2825 if (JDK_Version::current().compare_major(6) <= 0 && 2826 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2827 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2828 } 2829 #endif // LINUX 2830 return JNI_OK; 2831 } 2832 2833 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2834 // This must be done after all -D arguments have been processed. 2835 scp_p->expand_endorsed(); 2836 2837 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2838 // Assemble the bootclasspath elements into the final path. 2839 Arguments::set_sysclasspath(scp_p->combined_path()); 2840 } 2841 2842 // This must be done after all arguments have been processed. 2843 // java_compiler() true means set to "NONE" or empty. 2844 if (java_compiler() && !xdebug_mode()) { 2845 // For backwards compatibility, we switch to interpreted mode if 2846 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2847 // not specified. 2848 set_mode_flags(_int); 2849 } 2850 if (CompileThreshold == 0) { 2851 set_mode_flags(_int); 2852 } 2853 2854 #ifndef COMPILER2 2855 // Don't degrade server performance for footprint 2856 if (FLAG_IS_DEFAULT(UseLargePages) && 2857 MaxHeapSize < LargePageHeapSizeThreshold) { 2858 // No need for large granularity pages w/small heaps. 2859 // Note that large pages are enabled/disabled for both the 2860 // Java heap and the code cache. 2861 FLAG_SET_DEFAULT(UseLargePages, false); 2862 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2863 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2864 } 2865 2866 // Tiered compilation is undefined with C1. 2867 TieredCompilation = false; 2868 #else 2869 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2870 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2871 } 2872 #endif 2873 2874 // If we are running in a headless jre, force java.awt.headless property 2875 // to be true unless the property has already been set. 2876 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2877 if (os::is_headless_jre()) { 2878 const char* headless = Arguments::get_property("java.awt.headless"); 2879 if (headless == NULL) { 2880 char envbuffer[128]; 2881 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2882 if (!add_property("java.awt.headless=true")) { 2883 return JNI_ENOMEM; 2884 } 2885 } else { 2886 char buffer[256]; 2887 strcpy(buffer, "java.awt.headless="); 2888 strcat(buffer, envbuffer); 2889 if (!add_property(buffer)) { 2890 return JNI_ENOMEM; 2891 } 2892 } 2893 } 2894 } 2895 2896 if (!check_vm_args_consistency()) { 2897 return JNI_ERR; 2898 } 2899 2900 return JNI_OK; 2901 } 2902 2903 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2904 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2905 scp_assembly_required_p); 2906 } 2907 2908 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2909 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2910 scp_assembly_required_p); 2911 } 2912 2913 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2914 const int N_MAX_OPTIONS = 64; 2915 const int OPTION_BUFFER_SIZE = 1024; 2916 char buffer[OPTION_BUFFER_SIZE]; 2917 2918 // The variable will be ignored if it exceeds the length of the buffer. 2919 // Don't check this variable if user has special privileges 2920 // (e.g. unix su command). 2921 if (os::getenv(name, buffer, sizeof(buffer)) && 2922 !os::have_special_privileges()) { 2923 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2924 jio_fprintf(defaultStream::error_stream(), 2925 "Picked up %s: %s\n", name, buffer); 2926 char* rd = buffer; // pointer to the input string (rd) 2927 int i; 2928 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2929 while (isspace(*rd)) rd++; // skip whitespace 2930 if (*rd == 0) break; // we re done when the input string is read completely 2931 2932 // The output, option string, overwrites the input string. 2933 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2934 // input string (rd). 2935 char* wrt = rd; 2936 2937 options[i++].optionString = wrt; // Fill in option 2938 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2939 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2940 int quote = *rd; // matching quote to look for 2941 rd++; // don't copy open quote 2942 while (*rd != quote) { // include everything (even spaces) up until quote 2943 if (*rd == 0) { // string termination means unmatched string 2944 jio_fprintf(defaultStream::error_stream(), 2945 "Unmatched quote in %s\n", name); 2946 return JNI_ERR; 2947 } 2948 *wrt++ = *rd++; // copy to option string 2949 } 2950 rd++; // don't copy close quote 2951 } else { 2952 *wrt++ = *rd++; // copy to option string 2953 } 2954 } 2955 // Need to check if we're done before writing a NULL, 2956 // because the write could be to the byte that rd is pointing to. 2957 if (*rd++ == 0) { 2958 *wrt = 0; 2959 break; 2960 } 2961 *wrt = 0; // Zero terminate option 2962 } 2963 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2964 JavaVMInitArgs vm_args; 2965 vm_args.version = JNI_VERSION_1_2; 2966 vm_args.options = options; 2967 vm_args.nOptions = i; 2968 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2969 2970 if (PrintVMOptions) { 2971 const char* tail; 2972 for (int i = 0; i < vm_args.nOptions; i++) { 2973 const JavaVMOption *option = vm_args.options + i; 2974 if (match_option(option, "-XX:", &tail)) { 2975 logOption(tail); 2976 } 2977 } 2978 } 2979 2980 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2981 } 2982 return JNI_OK; 2983 } 2984 2985 void Arguments::set_shared_spaces_flags() { 2986 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 2987 const bool might_share = must_share || UseSharedSpaces; 2988 2989 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 2990 // static fields are incorrect in the archive. With some more clever 2991 // initialization, this restriction can probably be lifted. 2992 // ??? UseLargePages might be okay now 2993 const bool cannot_share = UseCompressedOops || 2994 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages)); 2995 if (cannot_share) { 2996 if (must_share) { 2997 warning("disabling large pages %s" 2998 "because of %s", "" LP64_ONLY("and compressed oops "), 2999 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 3000 FLAG_SET_CMDLINE(bool, UseLargePages, false); 3001 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 3002 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false)); 3003 } else { 3004 // Prefer compressed oops and large pages to class data sharing 3005 if (UseSharedSpaces && Verbose) { 3006 warning("turning off use of shared archive because of large pages%s", 3007 "" LP64_ONLY(" and/or compressed oops")); 3008 } 3009 no_shared_spaces(); 3010 } 3011 } else if (UseLargePages && might_share) { 3012 // Disable large pages to allow shared spaces. This is sub-optimal, since 3013 // there may not even be a shared archive to use. 3014 FLAG_SET_DEFAULT(UseLargePages, false); 3015 } 3016 3017 if (DumpSharedSpaces) { 3018 if (RequireSharedSpaces) { 3019 warning("cannot dump shared archive while using shared archive"); 3020 } 3021 UseSharedSpaces = false; 3022 } 3023 } 3024 3025 // Disable options not supported in this release, with a warning if they 3026 // were explicitly requested on the command-line 3027 #define UNSUPPORTED_OPTION(opt, description) \ 3028 do { \ 3029 if (opt) { \ 3030 if (FLAG_IS_CMDLINE(opt)) { \ 3031 warning(description " is disabled in this release."); \ 3032 } \ 3033 FLAG_SET_DEFAULT(opt, false); \ 3034 } \ 3035 } while(0) 3036 3037 // Parse entry point called from JNI_CreateJavaVM 3038 3039 jint Arguments::parse(const JavaVMInitArgs* args) { 3040 3041 // Sharing support 3042 // Construct the path to the archive 3043 char jvm_path[JVM_MAXPATHLEN]; 3044 os::jvm_path(jvm_path, sizeof(jvm_path)); 3045 char *end = strrchr(jvm_path, *os::file_separator()); 3046 if (end != NULL) *end = '\0'; 3047 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 3048 strlen(os::file_separator()) + 20, mtInternal); 3049 if (shared_archive_path == NULL) return JNI_ENOMEM; 3050 strcpy(shared_archive_path, jvm_path); 3051 strcat(shared_archive_path, os::file_separator()); 3052 strcat(shared_archive_path, "classes"); 3053 strcat(shared_archive_path, ".jsa"); 3054 SharedArchivePath = shared_archive_path; 3055 3056 // Remaining part of option string 3057 const char* tail; 3058 3059 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3060 const char* hotspotrc = ".hotspotrc"; 3061 bool settings_file_specified = false; 3062 bool needs_hotspotrc_warning = false; 3063 3064 const char* flags_file; 3065 int index; 3066 for (index = 0; index < args->nOptions; index++) { 3067 const JavaVMOption *option = args->options + index; 3068 if (match_option(option, "-XX:Flags=", &tail)) { 3069 flags_file = tail; 3070 settings_file_specified = true; 3071 } 3072 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3073 PrintVMOptions = true; 3074 } 3075 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3076 PrintVMOptions = false; 3077 } 3078 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3079 IgnoreUnrecognizedVMOptions = true; 3080 } 3081 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3082 IgnoreUnrecognizedVMOptions = false; 3083 } 3084 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3085 CommandLineFlags::printFlags(tty, false); 3086 vm_exit(0); 3087 } 3088 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3089 #if INCLUDE_NMT 3090 MemTracker::init_tracking_options(tail); 3091 #else 3092 warning("Native Memory Tracking is not supported in this VM"); 3093 #endif 3094 } 3095 3096 3097 #ifndef PRODUCT 3098 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3099 CommandLineFlags::printFlags(tty, true); 3100 vm_exit(0); 3101 } 3102 #endif 3103 } 3104 3105 if (IgnoreUnrecognizedVMOptions) { 3106 // uncast const to modify the flag args->ignoreUnrecognized 3107 *(jboolean*)(&args->ignoreUnrecognized) = true; 3108 } 3109 3110 // Parse specified settings file 3111 if (settings_file_specified) { 3112 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3113 return JNI_EINVAL; 3114 } 3115 } else { 3116 #ifdef ASSERT 3117 // Parse default .hotspotrc settings file 3118 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3119 return JNI_EINVAL; 3120 } 3121 #else 3122 struct stat buf; 3123 if (os::stat(hotspotrc, &buf) == 0) { 3124 needs_hotspotrc_warning = true; 3125 } 3126 #endif 3127 } 3128 3129 if (PrintVMOptions) { 3130 for (index = 0; index < args->nOptions; index++) { 3131 const JavaVMOption *option = args->options + index; 3132 if (match_option(option, "-XX:", &tail)) { 3133 logOption(tail); 3134 } 3135 } 3136 } 3137 3138 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3139 jint result = parse_vm_init_args(args); 3140 if (result != JNI_OK) { 3141 return result; 3142 } 3143 3144 // Delay warning until here so that we've had a chance to process 3145 // the -XX:-PrintWarnings flag 3146 if (needs_hotspotrc_warning) { 3147 warning("%s file is present but has been ignored. " 3148 "Run with -XX:Flags=%s to load the file.", 3149 hotspotrc, hotspotrc); 3150 } 3151 3152 #if (defined JAVASE_EMBEDDED || defined ARM) 3153 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3154 #endif 3155 3156 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3157 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3158 #endif 3159 3160 #if !INCLUDE_ALTERNATE_GCS 3161 if (UseParallelGC) { 3162 warning("Parallel GC is not supported in this VM. Using Serial GC."); 3163 } 3164 if (UseParallelOldGC) { 3165 warning("Parallel Old GC is not supported in this VM. Using Serial GC."); 3166 } 3167 if (UseConcMarkSweepGC) { 3168 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC."); 3169 } 3170 if (UseParNewGC) { 3171 warning("Par New GC is not supported in this VM. Using Serial GC."); 3172 } 3173 #endif // INCLUDE_ALTERNATE_GCS 3174 3175 #ifndef PRODUCT 3176 if (TraceBytecodesAt != 0) { 3177 TraceBytecodes = true; 3178 } 3179 if (CountCompiledCalls) { 3180 if (UseCounterDecay) { 3181 warning("UseCounterDecay disabled because CountCalls is set"); 3182 UseCounterDecay = false; 3183 } 3184 } 3185 #endif // PRODUCT 3186 3187 // JSR 292 is not supported before 1.7 3188 if (!JDK_Version::is_gte_jdk17x_version()) { 3189 if (EnableInvokeDynamic) { 3190 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3191 warning("JSR 292 is not supported before 1.7. Disabling support."); 3192 } 3193 EnableInvokeDynamic = false; 3194 } 3195 } 3196 3197 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3198 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3199 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3200 } 3201 ScavengeRootsInCode = 1; 3202 } 3203 3204 if (PrintGCDetails) { 3205 // Turn on -verbose:gc options as well 3206 PrintGC = true; 3207 } 3208 3209 if (!JDK_Version::is_gte_jdk18x_version()) { 3210 // To avoid changing the log format for 7 updates this flag is only 3211 // true by default in JDK8 and above. 3212 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3213 FLAG_SET_DEFAULT(PrintGCCause, false); 3214 } 3215 } 3216 3217 // Set object alignment values. 3218 set_object_alignment(); 3219 3220 #ifdef SERIALGC 3221 force_serial_gc(); 3222 #endif // SERIALGC 3223 #if !INCLUDE_CDS 3224 no_shared_spaces(); 3225 #endif // INCLUDE_CDS 3226 3227 // Set flags based on ergonomics. 3228 set_ergonomics_flags(); 3229 3230 set_shared_spaces_flags(); 3231 3232 // Check the GC selections again. 3233 if (!check_gc_consistency()) { 3234 return JNI_EINVAL; 3235 } 3236 3237 if (TieredCompilation) { 3238 set_tiered_flags(); 3239 } else { 3240 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3241 if (CompilationPolicyChoice >= 2) { 3242 vm_exit_during_initialization( 3243 "Incompatible compilation policy selected", NULL); 3244 } 3245 } 3246 3247 // Set heap size based on available physical memory 3248 set_heap_size(); 3249 3250 #if INCLUDE_ALTERNATE_GCS 3251 // Set per-collector flags 3252 if (UseParallelGC || UseParallelOldGC) { 3253 set_parallel_gc_flags(); 3254 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3255 set_cms_and_parnew_gc_flags(); 3256 } else if (UseParNewGC) { // skipped if CMS is set above 3257 set_parnew_gc_flags(); 3258 } else if (UseG1GC) { 3259 set_g1_gc_flags(); 3260 } 3261 check_deprecated_gcs(); 3262 #endif // INCLUDE_ALTERNATE_GCS 3263 3264 #ifdef SERIALGC 3265 assert(verify_serial_gc_flags(), "SerialGC unset"); 3266 #endif // SERIALGC 3267 3268 // Set bytecode rewriting flags 3269 set_bytecode_flags(); 3270 3271 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3272 set_aggressive_opts_flags(); 3273 3274 // Turn off biased locking for locking debug mode flags, 3275 // which are subtlely different from each other but neither works with 3276 // biased locking. 3277 if (UseHeavyMonitors 3278 #ifdef COMPILER1 3279 || !UseFastLocking 3280 #endif // COMPILER1 3281 ) { 3282 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3283 // flag set to true on command line; warn the user that they 3284 // can't enable biased locking here 3285 warning("Biased Locking is not supported with locking debug flags" 3286 "; ignoring UseBiasedLocking flag." ); 3287 } 3288 UseBiasedLocking = false; 3289 } 3290 3291 #ifdef CC_INTERP 3292 // Clear flags not supported by the C++ interpreter 3293 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3294 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3295 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3296 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3297 #endif // CC_INTERP 3298 3299 #ifdef COMPILER2 3300 if (!UseBiasedLocking || EmitSync != 0) { 3301 UseOptoBiasInlining = false; 3302 } 3303 if (!EliminateLocks) { 3304 EliminateNestedLocks = false; 3305 } 3306 if (!Inline) { 3307 IncrementalInline = false; 3308 } 3309 #ifndef PRODUCT 3310 if (!IncrementalInline) { 3311 AlwaysIncrementalInline = false; 3312 } 3313 #endif 3314 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3315 // incremental inlining: bump MaxNodeLimit 3316 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3317 } 3318 #endif 3319 3320 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3321 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3322 DebugNonSafepoints = true; 3323 } 3324 3325 #ifndef PRODUCT 3326 if (CompileTheWorld) { 3327 // Force NmethodSweeper to sweep whole CodeCache each time. 3328 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3329 NmethodSweepFraction = 1; 3330 } 3331 } 3332 #endif 3333 3334 if (PrintCommandLineFlags) { 3335 CommandLineFlags::printSetFlags(tty); 3336 } 3337 3338 // Apply CPU specific policy for the BiasedLocking 3339 if (UseBiasedLocking) { 3340 if (!VM_Version::use_biased_locking() && 3341 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3342 UseBiasedLocking = false; 3343 } 3344 } 3345 3346 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3347 // but only if not already set on the commandline 3348 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3349 bool set = false; 3350 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3351 if (!set) { 3352 FLAG_SET_DEFAULT(PauseAtExit, true); 3353 } 3354 } 3355 3356 return JNI_OK; 3357 } 3358 3359 jint Arguments::adjust_after_os() { 3360 #if INCLUDE_ALTERNATE_GCS 3361 if (UseParallelGC || UseParallelOldGC) { 3362 if (UseNUMA) { 3363 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3364 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3365 } 3366 // For those collectors or operating systems (eg, Windows) that do 3367 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3368 UseNUMAInterleaving = true; 3369 } 3370 } 3371 #endif 3372 return JNI_OK; 3373 } 3374 3375 int Arguments::PropertyList_count(SystemProperty* pl) { 3376 int count = 0; 3377 while(pl != NULL) { 3378 count++; 3379 pl = pl->next(); 3380 } 3381 return count; 3382 } 3383 3384 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3385 assert(key != NULL, "just checking"); 3386 SystemProperty* prop; 3387 for (prop = pl; prop != NULL; prop = prop->next()) { 3388 if (strcmp(key, prop->key()) == 0) return prop->value(); 3389 } 3390 return NULL; 3391 } 3392 3393 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3394 int count = 0; 3395 const char* ret_val = NULL; 3396 3397 while(pl != NULL) { 3398 if(count >= index) { 3399 ret_val = pl->key(); 3400 break; 3401 } 3402 count++; 3403 pl = pl->next(); 3404 } 3405 3406 return ret_val; 3407 } 3408 3409 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3410 int count = 0; 3411 char* ret_val = NULL; 3412 3413 while(pl != NULL) { 3414 if(count >= index) { 3415 ret_val = pl->value(); 3416 break; 3417 } 3418 count++; 3419 pl = pl->next(); 3420 } 3421 3422 return ret_val; 3423 } 3424 3425 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3426 SystemProperty* p = *plist; 3427 if (p == NULL) { 3428 *plist = new_p; 3429 } else { 3430 while (p->next() != NULL) { 3431 p = p->next(); 3432 } 3433 p->set_next(new_p); 3434 } 3435 } 3436 3437 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3438 if (plist == NULL) 3439 return; 3440 3441 SystemProperty* new_p = new SystemProperty(k, v, true); 3442 PropertyList_add(plist, new_p); 3443 } 3444 3445 // This add maintains unique property key in the list. 3446 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3447 if (plist == NULL) 3448 return; 3449 3450 // If property key exist then update with new value. 3451 SystemProperty* prop; 3452 for (prop = *plist; prop != NULL; prop = prop->next()) { 3453 if (strcmp(k, prop->key()) == 0) { 3454 if (append) { 3455 prop->append_value(v); 3456 } else { 3457 prop->set_value(v); 3458 } 3459 return; 3460 } 3461 } 3462 3463 PropertyList_add(plist, k, v); 3464 } 3465 3466 #ifdef KERNEL 3467 char *Arguments::get_kernel_properties() { 3468 // Find properties starting with kernel and append them to string 3469 // We need to find out how long they are first because the URL's that they 3470 // might point to could get long. 3471 int length = 0; 3472 SystemProperty* prop; 3473 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3474 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3475 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3476 } 3477 } 3478 // Add one for null terminator. 3479 char *props = AllocateHeap(length + 1, mtInternal); 3480 if (length != 0) { 3481 int pos = 0; 3482 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3483 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3484 jio_snprintf(&props[pos], length-pos, 3485 "-D%s=%s ", prop->key(), prop->value()); 3486 pos = strlen(props); 3487 } 3488 } 3489 } 3490 // null terminate props in case of null 3491 props[length] = '\0'; 3492 return props; 3493 } 3494 #endif // KERNEL 3495 3496 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3497 // Returns true if all of the source pointed by src has been copied over to 3498 // the destination buffer pointed by buf. Otherwise, returns false. 3499 // Notes: 3500 // 1. If the length (buflen) of the destination buffer excluding the 3501 // NULL terminator character is not long enough for holding the expanded 3502 // pid characters, it also returns false instead of returning the partially 3503 // expanded one. 3504 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3505 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3506 char* buf, size_t buflen) { 3507 const char* p = src; 3508 char* b = buf; 3509 const char* src_end = &src[srclen]; 3510 char* buf_end = &buf[buflen - 1]; 3511 3512 while (p < src_end && b < buf_end) { 3513 if (*p == '%') { 3514 switch (*(++p)) { 3515 case '%': // "%%" ==> "%" 3516 *b++ = *p++; 3517 break; 3518 case 'p': { // "%p" ==> current process id 3519 // buf_end points to the character before the last character so 3520 // that we could write '\0' to the end of the buffer. 3521 size_t buf_sz = buf_end - b + 1; 3522 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3523 3524 // if jio_snprintf fails or the buffer is not long enough to hold 3525 // the expanded pid, returns false. 3526 if (ret < 0 || ret >= (int)buf_sz) { 3527 return false; 3528 } else { 3529 b += ret; 3530 assert(*b == '\0', "fail in copy_expand_pid"); 3531 if (p == src_end && b == buf_end + 1) { 3532 // reach the end of the buffer. 3533 return true; 3534 } 3535 } 3536 p++; 3537 break; 3538 } 3539 default : 3540 *b++ = '%'; 3541 } 3542 } else { 3543 *b++ = *p++; 3544 } 3545 } 3546 *b = '\0'; 3547 return (p == src_end); // return false if not all of the source was copied 3548 }