1 /* 2 * Copyright (c) 1997, 2013, 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/macros.hpp" 42 #include "utilities/taskqueue.hpp" 43 #ifdef TARGET_OS_FAMILY_linux 44 # include "os_linux.inline.hpp" 45 #endif 46 #ifdef TARGET_OS_FAMILY_solaris 47 # include "os_solaris.inline.hpp" 48 #endif 49 #ifdef TARGET_OS_FAMILY_windows 50 # include "os_windows.inline.hpp" 51 #endif 52 #ifdef TARGET_OS_FAMILY_bsd 53 # include "os_bsd.inline.hpp" 54 #endif 55 #if INCLUDE_ALL_GCS 56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 57 #endif // INCLUDE_ALL_GCS 58 59 // Note: This is a special bug reporting site for the JVM 60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 61 #define DEFAULT_JAVA_LAUNCHER "generic" 62 63 char** Arguments::_jvm_flags_array = NULL; 64 int Arguments::_num_jvm_flags = 0; 65 char** Arguments::_jvm_args_array = NULL; 66 int Arguments::_num_jvm_args = 0; 67 char* Arguments::_java_command = NULL; 68 SystemProperty* Arguments::_system_properties = NULL; 69 const char* Arguments::_gc_log_filename = NULL; 70 bool Arguments::_has_profile = false; 71 bool Arguments::_has_alloc_profile = false; 72 uintx Arguments::_min_heap_size = 0; 73 Arguments::Mode Arguments::_mode = _mixed; 74 bool Arguments::_java_compiler = false; 75 bool Arguments::_xdebug_mode = false; 76 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 77 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 78 int Arguments::_sun_java_launcher_pid = -1; 79 bool Arguments::_created_by_gamma_launcher = false; 80 81 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 84 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 85 bool Arguments::_ClipInlining = ClipInlining; 86 87 char* Arguments::SharedArchivePath = NULL; 88 89 AgentLibraryList Arguments::_libraryList; 90 AgentLibraryList Arguments::_agentList; 91 92 abort_hook_t Arguments::_abort_hook = NULL; 93 exit_hook_t Arguments::_exit_hook = NULL; 94 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 95 96 97 SystemProperty *Arguments::_java_ext_dirs = NULL; 98 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 99 SystemProperty *Arguments::_sun_boot_library_path = NULL; 100 SystemProperty *Arguments::_java_library_path = NULL; 101 SystemProperty *Arguments::_java_home = NULL; 102 SystemProperty *Arguments::_java_class_path = NULL; 103 SystemProperty *Arguments::_sun_boot_class_path = NULL; 104 105 char* Arguments::_meta_index_path = NULL; 106 char* Arguments::_meta_index_dir = NULL; 107 108 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 109 110 static bool match_option(const JavaVMOption *option, const char* name, 111 const char** tail) { 112 int len = (int)strlen(name); 113 if (strncmp(option->optionString, name, len) == 0) { 114 *tail = option->optionString + len; 115 return true; 116 } else { 117 return false; 118 } 119 } 120 121 static void logOption(const char* opt) { 122 if (PrintVMOptions) { 123 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 124 } 125 } 126 127 // Process java launcher properties. 128 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 129 // See if sun.java.launcher or sun.java.launcher.pid is defined. 130 // Must do this before setting up other system properties, 131 // as some of them may depend on launcher type. 132 for (int index = 0; index < args->nOptions; index++) { 133 const JavaVMOption* option = args->options + index; 134 const char* tail; 135 136 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 137 process_java_launcher_argument(tail, option->extraInfo); 138 continue; 139 } 140 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 141 _sun_java_launcher_pid = atoi(tail); 142 continue; 143 } 144 } 145 } 146 147 // Initialize system properties key and value. 148 void Arguments::init_system_properties() { 149 150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 151 "Java Virtual Machine Specification", false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 155 156 // following are JVMTI agent writeable properties. 157 // Properties values are set to NULL and they are 158 // os specific they are initialized in os::init_system_properties_values(). 159 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 160 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 161 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 162 _java_library_path = new SystemProperty("java.library.path", NULL, true); 163 _java_home = new SystemProperty("java.home", NULL, true); 164 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 165 166 _java_class_path = new SystemProperty("java.class.path", "", true); 167 168 // Add to System Property list. 169 PropertyList_add(&_system_properties, _java_ext_dirs); 170 PropertyList_add(&_system_properties, _java_endorsed_dirs); 171 PropertyList_add(&_system_properties, _sun_boot_library_path); 172 PropertyList_add(&_system_properties, _java_library_path); 173 PropertyList_add(&_system_properties, _java_home); 174 PropertyList_add(&_system_properties, _java_class_path); 175 PropertyList_add(&_system_properties, _sun_boot_class_path); 176 177 // Set OS specific system properties values 178 os::init_system_properties_values(); 179 } 180 181 182 // Update/Initialize System properties after JDK version number is known 183 void Arguments::init_version_specific_system_properties() { 184 enum { bufsz = 16 }; 185 char buffer[bufsz]; 186 const char* spec_vendor = "Sun Microsystems Inc."; 187 uint32_t spec_version = 0; 188 189 if (JDK_Version::is_gte_jdk17x_version()) { 190 spec_vendor = "Oracle Corporation"; 191 spec_version = JDK_Version::current().major_version(); 192 } 193 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 194 195 PropertyList_add(&_system_properties, 196 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 197 PropertyList_add(&_system_properties, 198 new SystemProperty("java.vm.specification.version", buffer, false)); 199 PropertyList_add(&_system_properties, 200 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 201 } 202 203 /** 204 * Provide a slightly more user-friendly way of eliminating -XX flags. 205 * When a flag is eliminated, it can be added to this list in order to 206 * continue accepting this flag on the command-line, while issuing a warning 207 * and ignoring the value. Once the JDK version reaches the 'accept_until' 208 * limit, we flatly refuse to admit the existence of the flag. This allows 209 * a flag to die correctly over JDK releases using HSX. 210 */ 211 typedef struct { 212 const char* name; 213 JDK_Version obsoleted_in; // when the flag went away 214 JDK_Version accept_until; // which version to start denying the existence 215 } ObsoleteFlag; 216 217 static ObsoleteFlag obsolete_jvm_flags[] = { 218 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 231 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 232 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 233 { "DefaultInitialRAMFraction", 234 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 235 { "UseDepthFirstScavengeOrder", 236 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 237 { "HandlePromotionFailure", 238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 239 { "MaxLiveObjectEvacuationRatio", 240 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 241 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 242 { "UseParallelOldGCCompacting", 243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 244 { "UseParallelDensePrefixUpdate", 245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 246 { "UseParallelOldGCDensePrefix", 247 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 248 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 249 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 250 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 251 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 252 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 253 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 254 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 255 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 256 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 257 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 258 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 259 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 260 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 261 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 262 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 263 #ifdef PRODUCT 264 { "DesiredMethodLimit", 265 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 266 #endif // PRODUCT 267 { NULL, JDK_Version(0), JDK_Version(0) } 268 }; 269 270 // Returns true if the flag is obsolete and fits into the range specified 271 // for being ignored. In the case that the flag is ignored, the 'version' 272 // value is filled in with the version number when the flag became 273 // obsolete so that that value can be displayed to the user. 274 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 275 int i = 0; 276 assert(version != NULL, "Must provide a version buffer"); 277 while (obsolete_jvm_flags[i].name != NULL) { 278 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 279 // <flag>=xxx form 280 // [-|+]<flag> form 281 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 282 ((s[0] == '+' || s[0] == '-') && 283 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 284 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 285 *version = flag_status.obsoleted_in; 286 return true; 287 } 288 } 289 i++; 290 } 291 return false; 292 } 293 294 // Constructs the system class path (aka boot class path) from the following 295 // components, in order: 296 // 297 // prefix // from -Xbootclasspath/p:... 298 // endorsed // the expansion of -Djava.endorsed.dirs=... 299 // base // from os::get_system_properties() or -Xbootclasspath= 300 // suffix // from -Xbootclasspath/a:... 301 // 302 // java.endorsed.dirs is a list of directories; any jar or zip files in the 303 // directories are added to the sysclasspath just before the base. 304 // 305 // This could be AllStatic, but it isn't needed after argument processing is 306 // complete. 307 class SysClassPath: public StackObj { 308 public: 309 SysClassPath(const char* base); 310 ~SysClassPath(); 311 312 inline void set_base(const char* base); 313 inline void add_prefix(const char* prefix); 314 inline void add_suffix_to_prefix(const char* suffix); 315 inline void add_suffix(const char* suffix); 316 inline void reset_path(const char* base); 317 318 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 319 // property. Must be called after all command-line arguments have been 320 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 321 // combined_path(). 322 void expand_endorsed(); 323 324 inline const char* get_base() const { return _items[_scp_base]; } 325 inline const char* get_prefix() const { return _items[_scp_prefix]; } 326 inline const char* get_suffix() const { return _items[_scp_suffix]; } 327 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 328 329 // Combine all the components into a single c-heap-allocated string; caller 330 // must free the string if/when no longer needed. 331 char* combined_path(); 332 333 private: 334 // Utility routines. 335 static char* add_to_path(const char* path, const char* str, bool prepend); 336 static char* add_jars_to_path(char* path, const char* directory); 337 338 inline void reset_item_at(int index); 339 340 // Array indices for the items that make up the sysclasspath. All except the 341 // base are allocated in the C heap and freed by this class. 342 enum { 343 _scp_prefix, // from -Xbootclasspath/p:... 344 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 345 _scp_base, // the default sysclasspath 346 _scp_suffix, // from -Xbootclasspath/a:... 347 _scp_nitems // the number of items, must be last. 348 }; 349 350 const char* _items[_scp_nitems]; 351 DEBUG_ONLY(bool _expansion_done;) 352 }; 353 354 SysClassPath::SysClassPath(const char* base) { 355 memset(_items, 0, sizeof(_items)); 356 _items[_scp_base] = base; 357 DEBUG_ONLY(_expansion_done = false;) 358 } 359 360 SysClassPath::~SysClassPath() { 361 // Free everything except the base. 362 for (int i = 0; i < _scp_nitems; ++i) { 363 if (i != _scp_base) reset_item_at(i); 364 } 365 DEBUG_ONLY(_expansion_done = false;) 366 } 367 368 inline void SysClassPath::set_base(const char* base) { 369 _items[_scp_base] = base; 370 } 371 372 inline void SysClassPath::add_prefix(const char* prefix) { 373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 374 } 375 376 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 378 } 379 380 inline void SysClassPath::add_suffix(const char* suffix) { 381 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 382 } 383 384 inline void SysClassPath::reset_item_at(int index) { 385 assert(index < _scp_nitems && index != _scp_base, "just checking"); 386 if (_items[index] != NULL) { 387 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 388 _items[index] = NULL; 389 } 390 } 391 392 inline void SysClassPath::reset_path(const char* base) { 393 // Clear the prefix and suffix. 394 reset_item_at(_scp_prefix); 395 reset_item_at(_scp_suffix); 396 set_base(base); 397 } 398 399 //------------------------------------------------------------------------------ 400 401 void SysClassPath::expand_endorsed() { 402 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 403 404 const char* path = Arguments::get_property("java.endorsed.dirs"); 405 if (path == NULL) { 406 path = Arguments::get_endorsed_dir(); 407 assert(path != NULL, "no default for java.endorsed.dirs"); 408 } 409 410 char* expanded_path = NULL; 411 const char separator = *os::path_separator(); 412 const char* const end = path + strlen(path); 413 while (path < end) { 414 const char* tmp_end = strchr(path, separator); 415 if (tmp_end == NULL) { 416 expanded_path = add_jars_to_path(expanded_path, path); 417 path = end; 418 } else { 419 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 420 memcpy(dirpath, path, tmp_end - path); 421 dirpath[tmp_end - path] = '\0'; 422 expanded_path = add_jars_to_path(expanded_path, dirpath); 423 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 424 path = tmp_end + 1; 425 } 426 } 427 _items[_scp_endorsed] = expanded_path; 428 DEBUG_ONLY(_expansion_done = true;) 429 } 430 431 // Combine the bootclasspath elements, some of which may be null, into a single 432 // c-heap-allocated string. 433 char* SysClassPath::combined_path() { 434 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 435 assert(_expansion_done, "must call expand_endorsed() first."); 436 437 size_t lengths[_scp_nitems]; 438 size_t total_len = 0; 439 440 const char separator = *os::path_separator(); 441 442 // Get the lengths. 443 int i; 444 for (i = 0; i < _scp_nitems; ++i) { 445 if (_items[i] != NULL) { 446 lengths[i] = strlen(_items[i]); 447 // Include space for the separator char (or a NULL for the last item). 448 total_len += lengths[i] + 1; 449 } 450 } 451 assert(total_len > 0, "empty sysclasspath not allowed"); 452 453 // Copy the _items to a single string. 454 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 455 char* cp_tmp = cp; 456 for (i = 0; i < _scp_nitems; ++i) { 457 if (_items[i] != NULL) { 458 memcpy(cp_tmp, _items[i], lengths[i]); 459 cp_tmp += lengths[i]; 460 *cp_tmp++ = separator; 461 } 462 } 463 *--cp_tmp = '\0'; // Replace the extra separator. 464 return cp; 465 } 466 467 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 468 char* 469 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 470 char *cp; 471 472 assert(str != NULL, "just checking"); 473 if (path == NULL) { 474 size_t len = strlen(str) + 1; 475 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 476 memcpy(cp, str, len); // copy the trailing null 477 } else { 478 const char separator = *os::path_separator(); 479 size_t old_len = strlen(path); 480 size_t str_len = strlen(str); 481 size_t len = old_len + str_len + 2; 482 483 if (prepend) { 484 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 485 char* cp_tmp = cp; 486 memcpy(cp_tmp, str, str_len); 487 cp_tmp += str_len; 488 *cp_tmp = separator; 489 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 490 FREE_C_HEAP_ARRAY(char, path, mtInternal); 491 } else { 492 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 493 char* cp_tmp = cp + old_len; 494 *cp_tmp = separator; 495 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 496 } 497 } 498 return cp; 499 } 500 501 // Scan the directory and append any jar or zip files found to path. 502 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 503 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 504 DIR* dir = os::opendir(directory); 505 if (dir == NULL) return path; 506 507 char dir_sep[2] = { '\0', '\0' }; 508 size_t directory_len = strlen(directory); 509 const char fileSep = *os::file_separator(); 510 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 511 512 /* Scan the directory for jars/zips, appending them to path. */ 513 struct dirent *entry; 514 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 515 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 516 const char* name = entry->d_name; 517 const char* ext = name + strlen(name) - 4; 518 bool isJarOrZip = ext > name && 519 (os::file_name_strcmp(ext, ".jar") == 0 || 520 os::file_name_strcmp(ext, ".zip") == 0); 521 if (isJarOrZip) { 522 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 523 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 524 path = add_to_path(path, jarpath, false); 525 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 526 } 527 } 528 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 529 os::closedir(dir); 530 return path; 531 } 532 533 // Parses a memory size specification string. 534 static bool atomull(const char *s, julong* result) { 535 julong n = 0; 536 int args_read = sscanf(s, JULONG_FORMAT, &n); 537 if (args_read != 1) { 538 return false; 539 } 540 while (*s != '\0' && isdigit(*s)) { 541 s++; 542 } 543 // 4705540: illegal if more characters are found after the first non-digit 544 if (strlen(s) > 1) { 545 return false; 546 } 547 switch (*s) { 548 case 'T': case 't': 549 *result = n * G * K; 550 // Check for overflow. 551 if (*result/((julong)G * K) != n) return false; 552 return true; 553 case 'G': case 'g': 554 *result = n * G; 555 if (*result/G != n) return false; 556 return true; 557 case 'M': case 'm': 558 *result = n * M; 559 if (*result/M != n) return false; 560 return true; 561 case 'K': case 'k': 562 *result = n * K; 563 if (*result/K != n) return false; 564 return true; 565 case '\0': 566 *result = n; 567 return true; 568 default: 569 return false; 570 } 571 } 572 573 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 574 if (size < min_size) return arg_too_small; 575 // Check that size will fit in a size_t (only relevant on 32-bit) 576 if (size > max_uintx) return arg_too_big; 577 return arg_in_range; 578 } 579 580 // Describe an argument out of range error 581 void Arguments::describe_range_error(ArgsRange errcode) { 582 switch(errcode) { 583 case arg_too_big: 584 jio_fprintf(defaultStream::error_stream(), 585 "The specified size exceeds the maximum " 586 "representable size.\n"); 587 break; 588 case arg_too_small: 589 case arg_unreadable: 590 case arg_in_range: 591 // do nothing for now 592 break; 593 default: 594 ShouldNotReachHere(); 595 } 596 } 597 598 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 599 return CommandLineFlags::boolAtPut(name, &value, origin); 600 } 601 602 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 603 double v; 604 if (sscanf(value, "%lf", &v) != 1) { 605 return false; 606 } 607 608 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 609 return true; 610 } 611 return false; 612 } 613 614 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 615 julong v; 616 intx intx_v; 617 bool is_neg = false; 618 // Check the sign first since atomull() parses only unsigned values. 619 if (*value == '-') { 620 if (!CommandLineFlags::intxAt(name, &intx_v)) { 621 return false; 622 } 623 value++; 624 is_neg = true; 625 } 626 if (!atomull(value, &v)) { 627 return false; 628 } 629 intx_v = (intx) v; 630 if (is_neg) { 631 intx_v = -intx_v; 632 } 633 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 634 return true; 635 } 636 uintx uintx_v = (uintx) v; 637 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 638 return true; 639 } 640 uint64_t uint64_t_v = (uint64_t) v; 641 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 642 return true; 643 } 644 return false; 645 } 646 647 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 648 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 649 // Contract: CommandLineFlags always returns a pointer that needs freeing. 650 FREE_C_HEAP_ARRAY(char, value, mtInternal); 651 return true; 652 } 653 654 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 655 const char* old_value = ""; 656 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 657 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 658 size_t new_len = strlen(new_value); 659 const char* value; 660 char* free_this_too = NULL; 661 if (old_len == 0) { 662 value = new_value; 663 } else if (new_len == 0) { 664 value = old_value; 665 } else { 666 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 667 // each new setting adds another LINE to the switch: 668 sprintf(buf, "%s\n%s", old_value, new_value); 669 value = buf; 670 free_this_too = buf; 671 } 672 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 673 // CommandLineFlags always returns a pointer that needs freeing. 674 FREE_C_HEAP_ARRAY(char, value, mtInternal); 675 if (free_this_too != NULL) { 676 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 677 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 678 } 679 return true; 680 } 681 682 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 683 684 // range of acceptable characters spelled out for portability reasons 685 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 686 #define BUFLEN 255 687 char name[BUFLEN+1]; 688 char dummy; 689 690 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 691 return set_bool_flag(name, false, origin); 692 } 693 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 694 return set_bool_flag(name, true, origin); 695 } 696 697 char punct; 698 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 699 const char* value = strchr(arg, '=') + 1; 700 Flag* flag = Flag::find_flag(name, strlen(name)); 701 if (flag != NULL && flag->is_ccstr()) { 702 if (flag->ccstr_accumulates()) { 703 return append_to_string_flag(name, value, origin); 704 } else { 705 if (value[0] == '\0') { 706 value = NULL; 707 } 708 return set_string_flag(name, value, origin); 709 } 710 } 711 } 712 713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 714 const char* value = strchr(arg, '=') + 1; 715 // -XX:Foo:=xxx will reset the string flag to the given value. 716 if (value[0] == '\0') { 717 value = NULL; 718 } 719 return set_string_flag(name, value, origin); 720 } 721 722 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 723 #define SIGNED_NUMBER_RANGE "[-0123456789]" 724 #define NUMBER_RANGE "[0123456789]" 725 char value[BUFLEN + 1]; 726 char value2[BUFLEN + 1]; 727 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 728 // Looks like a floating-point number -- try again with more lenient format string 729 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 730 return set_fp_numeric_flag(name, value, origin); 731 } 732 } 733 734 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 735 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 736 return set_numeric_flag(name, value, origin); 737 } 738 739 return false; 740 } 741 742 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 743 assert(bldarray != NULL, "illegal argument"); 744 745 if (arg == NULL) { 746 return; 747 } 748 749 int index = *count; 750 751 // expand the array and add arg to the last element 752 (*count)++; 753 if (*bldarray == NULL) { 754 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal); 755 } else { 756 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal); 757 } 758 (*bldarray)[index] = strdup(arg); 759 } 760 761 void Arguments::build_jvm_args(const char* arg) { 762 add_string(&_jvm_args_array, &_num_jvm_args, arg); 763 } 764 765 void Arguments::build_jvm_flags(const char* arg) { 766 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 767 } 768 769 // utility function to return a string that concatenates all 770 // strings in a given char** array 771 const char* Arguments::build_resource_string(char** args, int count) { 772 if (args == NULL || count == 0) { 773 return NULL; 774 } 775 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 776 for (int i = 1; i < count; i++) { 777 length += strlen(args[i]) + 1; // add 1 for a space 778 } 779 char* s = NEW_RESOURCE_ARRAY(char, length); 780 strcpy(s, args[0]); 781 for (int j = 1; j < count; j++) { 782 strcat(s, " "); 783 strcat(s, args[j]); 784 } 785 return (const char*) s; 786 } 787 788 void Arguments::print_on(outputStream* st) { 789 st->print_cr("VM Arguments:"); 790 if (num_jvm_flags() > 0) { 791 st->print("jvm_flags: "); print_jvm_flags_on(st); 792 } 793 if (num_jvm_args() > 0) { 794 st->print("jvm_args: "); print_jvm_args_on(st); 795 } 796 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 797 if (_java_class_path != NULL) { 798 char* path = _java_class_path->value(); 799 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 800 } 801 st->print_cr("Launcher Type: %s", _sun_java_launcher); 802 } 803 804 void Arguments::print_jvm_flags_on(outputStream* st) { 805 if (_num_jvm_flags > 0) { 806 for (int i=0; i < _num_jvm_flags; i++) { 807 st->print("%s ", _jvm_flags_array[i]); 808 } 809 st->print_cr(""); 810 } 811 } 812 813 void Arguments::print_jvm_args_on(outputStream* st) { 814 if (_num_jvm_args > 0) { 815 for (int i=0; i < _num_jvm_args; i++) { 816 st->print("%s ", _jvm_args_array[i]); 817 } 818 st->print_cr(""); 819 } 820 } 821 822 bool Arguments::process_argument(const char* arg, 823 jboolean ignore_unrecognized, FlagValueOrigin origin) { 824 825 JDK_Version since = JDK_Version(); 826 827 if (parse_argument(arg, origin) || ignore_unrecognized) { 828 return true; 829 } 830 831 bool has_plus_minus = (*arg == '+' || *arg == '-'); 832 const char* const argname = has_plus_minus ? arg + 1 : arg; 833 if (is_newly_obsolete(arg, &since)) { 834 char version[256]; 835 since.to_string(version, sizeof(version)); 836 warning("ignoring option %s; support was removed in %s", argname, version); 837 return true; 838 } 839 840 // For locked flags, report a custom error message if available. 841 // Otherwise, report the standard unrecognized VM option. 842 843 size_t arg_len; 844 const char* equal_sign = strchr(argname, '='); 845 if (equal_sign == NULL) { 846 arg_len = strlen(argname); 847 } else { 848 arg_len = equal_sign - argname; 849 } 850 851 Flag* found_flag = Flag::find_flag((char*)argname, arg_len, true); 852 if (found_flag != NULL) { 853 char locked_message_buf[BUFLEN]; 854 found_flag->get_locked_message(locked_message_buf, BUFLEN); 855 if (strlen(locked_message_buf) == 0) { 856 if (found_flag->is_bool() && !has_plus_minus) { 857 jio_fprintf(defaultStream::error_stream(), 858 "Missing +/- setting for VM option '%s'\n", argname); 859 } else if (!found_flag->is_bool() && has_plus_minus) { 860 jio_fprintf(defaultStream::error_stream(), 861 "Unexpected +/- setting in VM option '%s'\n", argname); 862 } else { 863 jio_fprintf(defaultStream::error_stream(), 864 "Improperly specified VM option '%s'\n", argname); 865 } 866 } else { 867 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 868 } 869 } else { 870 jio_fprintf(defaultStream::error_stream(), 871 "Unrecognized VM option '%s'\n", argname); 872 } 873 874 // allow for commandline "commenting out" options like -XX:#+Verbose 875 return arg[0] == '#'; 876 } 877 878 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 879 FILE* stream = fopen(file_name, "rb"); 880 if (stream == NULL) { 881 if (should_exist) { 882 jio_fprintf(defaultStream::error_stream(), 883 "Could not open settings file %s\n", file_name); 884 return false; 885 } else { 886 return true; 887 } 888 } 889 890 char token[1024]; 891 int pos = 0; 892 893 bool in_white_space = true; 894 bool in_comment = false; 895 bool in_quote = false; 896 char quote_c = 0; 897 bool result = true; 898 899 int c = getc(stream); 900 while(c != EOF && pos < (int)(sizeof(token)-1)) { 901 if (in_white_space) { 902 if (in_comment) { 903 if (c == '\n') in_comment = false; 904 } else { 905 if (c == '#') in_comment = true; 906 else if (!isspace(c)) { 907 in_white_space = false; 908 token[pos++] = c; 909 } 910 } 911 } else { 912 if (c == '\n' || (!in_quote && isspace(c))) { 913 // token ends at newline, or at unquoted whitespace 914 // this allows a way to include spaces in string-valued options 915 token[pos] = '\0'; 916 logOption(token); 917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 918 build_jvm_flags(token); 919 pos = 0; 920 in_white_space = true; 921 in_quote = false; 922 } else if (!in_quote && (c == '\'' || c == '"')) { 923 in_quote = true; 924 quote_c = c; 925 } else if (in_quote && (c == quote_c)) { 926 in_quote = false; 927 } else { 928 token[pos++] = c; 929 } 930 } 931 c = getc(stream); 932 } 933 if (pos > 0) { 934 token[pos] = '\0'; 935 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 936 build_jvm_flags(token); 937 } 938 fclose(stream); 939 return result; 940 } 941 942 //============================================================================================================= 943 // Parsing of properties (-D) 944 945 const char* Arguments::get_property(const char* key) { 946 return PropertyList_get_value(system_properties(), key); 947 } 948 949 bool Arguments::add_property(const char* prop) { 950 const char* eq = strchr(prop, '='); 951 char* key; 952 // ns must be static--its address may be stored in a SystemProperty object. 953 const static char ns[1] = {0}; 954 char* value = (char *)ns; 955 956 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 957 key = AllocateHeap(key_len + 1, mtInternal); 958 strncpy(key, prop, key_len); 959 key[key_len] = '\0'; 960 961 if (eq != NULL) { 962 size_t value_len = strlen(prop) - key_len - 1; 963 value = AllocateHeap(value_len + 1, mtInternal); 964 strncpy(value, &prop[key_len + 1], value_len + 1); 965 } 966 967 if (strcmp(key, "java.compiler") == 0) { 968 process_java_compiler_argument(value); 969 FreeHeap(key); 970 if (eq != NULL) { 971 FreeHeap(value); 972 } 973 return true; 974 } else if (strcmp(key, "sun.java.command") == 0) { 975 _java_command = value; 976 977 // Record value in Arguments, but let it get passed to Java. 978 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 979 // launcher.pid property is private and is processed 980 // in process_sun_java_launcher_properties(); 981 // the sun.java.launcher property is passed on to the java application 982 FreeHeap(key); 983 if (eq != NULL) { 984 FreeHeap(value); 985 } 986 return true; 987 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 988 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 989 // its value without going through the property list or making a Java call. 990 _java_vendor_url_bug = value; 991 } else if (strcmp(key, "sun.boot.library.path") == 0) { 992 PropertyList_unique_add(&_system_properties, key, value, true); 993 return true; 994 } 995 // Create new property and add at the end of the list 996 PropertyList_unique_add(&_system_properties, key, value); 997 return true; 998 } 999 1000 //=========================================================================================================== 1001 // Setting int/mixed/comp mode flags 1002 1003 void Arguments::set_mode_flags(Mode mode) { 1004 // Set up default values for all flags. 1005 // If you add a flag to any of the branches below, 1006 // add a default value for it here. 1007 set_java_compiler(false); 1008 _mode = mode; 1009 1010 // Ensure Agent_OnLoad has the correct initial values. 1011 // This may not be the final mode; mode may change later in onload phase. 1012 PropertyList_unique_add(&_system_properties, "java.vm.info", 1013 (char*)VM_Version::vm_info_string(), false); 1014 1015 UseInterpreter = true; 1016 UseCompiler = true; 1017 UseLoopCounter = true; 1018 1019 #ifndef ZERO 1020 // Turn these off for mixed and comp. Leave them on for Zero. 1021 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1022 UseFastAccessorMethods = (mode == _int); 1023 } 1024 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1025 UseFastEmptyMethods = (mode == _int); 1026 } 1027 #endif 1028 1029 // Default values may be platform/compiler dependent - 1030 // use the saved values 1031 ClipInlining = Arguments::_ClipInlining; 1032 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1033 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1034 BackgroundCompilation = Arguments::_BackgroundCompilation; 1035 1036 // Change from defaults based on mode 1037 switch (mode) { 1038 default: 1039 ShouldNotReachHere(); 1040 break; 1041 case _int: 1042 UseCompiler = false; 1043 UseLoopCounter = false; 1044 AlwaysCompileLoopMethods = false; 1045 UseOnStackReplacement = false; 1046 break; 1047 case _mixed: 1048 // same as default 1049 break; 1050 case _comp: 1051 UseInterpreter = false; 1052 BackgroundCompilation = false; 1053 ClipInlining = false; 1054 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1055 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1056 // compile a level 4 (C2) and then continue executing it. 1057 if (TieredCompilation) { 1058 Tier3InvokeNotifyFreqLog = 0; 1059 Tier4InvocationThreshold = 0; 1060 } 1061 break; 1062 } 1063 } 1064 1065 // Conflict: required to use shared spaces (-Xshare:on), but 1066 // incompatible command line options were chosen. 1067 1068 static void no_shared_spaces() { 1069 if (RequireSharedSpaces) { 1070 jio_fprintf(defaultStream::error_stream(), 1071 "Class data sharing is inconsistent with other specified options.\n"); 1072 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1073 } else { 1074 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1075 } 1076 } 1077 1078 void Arguments::set_tiered_flags() { 1079 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1080 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1081 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1082 } 1083 if (CompilationPolicyChoice < 2) { 1084 vm_exit_during_initialization( 1085 "Incompatible compilation policy selected", NULL); 1086 } 1087 // Increase the code cache size - tiered compiles a lot more. 1088 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1089 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1090 } 1091 } 1092 1093 #if INCLUDE_ALL_GCS 1094 static void disable_adaptive_size_policy(const char* collector_name) { 1095 if (UseAdaptiveSizePolicy) { 1096 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1097 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1098 collector_name); 1099 } 1100 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1101 } 1102 } 1103 1104 void Arguments::set_parnew_gc_flags() { 1105 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1106 "control point invariant"); 1107 assert(UseParNewGC, "Error"); 1108 1109 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1110 disable_adaptive_size_policy("UseParNewGC"); 1111 1112 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1113 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1114 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1115 } else if (ParallelGCThreads == 0) { 1116 jio_fprintf(defaultStream::error_stream(), 1117 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1118 vm_exit(1); 1119 } 1120 1121 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1122 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1123 // we set them to 1024 and 1024. 1124 // See CR 6362902. 1125 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1126 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1127 } 1128 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1129 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1130 } 1131 1132 // AlwaysTenure flag should make ParNew promote all at first collection. 1133 // See CR 6362902. 1134 if (AlwaysTenure) { 1135 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1136 } 1137 // When using compressed oops, we use local overflow stacks, 1138 // rather than using a global overflow list chained through 1139 // the klass word of the object's pre-image. 1140 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1141 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1142 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1143 } 1144 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1145 } 1146 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1147 } 1148 1149 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1150 // sparc/solaris for certain applications, but would gain from 1151 // further optimization and tuning efforts, and would almost 1152 // certainly gain from analysis of platform and environment. 1153 void Arguments::set_cms_and_parnew_gc_flags() { 1154 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1155 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1156 1157 // If we are using CMS, we prefer to UseParNewGC, 1158 // unless explicitly forbidden. 1159 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1160 FLAG_SET_ERGO(bool, UseParNewGC, true); 1161 } 1162 1163 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1164 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1165 1166 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1167 // as needed. 1168 if (UseParNewGC) { 1169 set_parnew_gc_flags(); 1170 } 1171 1172 // MaxHeapSize is aligned down in collectorPolicy 1173 size_t max_heap = align_size_down(MaxHeapSize, 1174 CardTableRS::ct_max_alignment_constraint()); 1175 1176 // Now make adjustments for CMS 1177 intx tenuring_default = (intx)6; 1178 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1179 1180 // Preferred young gen size for "short" pauses: 1181 // upper bound depends on # of threads and NewRatio. 1182 const uintx parallel_gc_threads = 1183 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1184 const size_t preferred_max_new_size_unaligned = 1185 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1186 size_t preferred_max_new_size = 1187 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1188 1189 // Unless explicitly requested otherwise, size young gen 1190 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1191 1192 // If either MaxNewSize or NewRatio is set on the command line, 1193 // assume the user is trying to set the size of the young gen. 1194 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1195 1196 // Set MaxNewSize to our calculated preferred_max_new_size unless 1197 // NewSize was set on the command line and it is larger than 1198 // preferred_max_new_size. 1199 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1200 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1201 } else { 1202 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1203 } 1204 if (PrintGCDetails && Verbose) { 1205 // Too early to use gclog_or_tty 1206 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1207 } 1208 1209 // Code along this path potentially sets NewSize and OldSize 1210 1211 assert(max_heap >= InitialHeapSize, "Error"); 1212 assert(max_heap >= NewSize, "Error"); 1213 1214 if (PrintGCDetails && Verbose) { 1215 // Too early to use gclog_or_tty 1216 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1217 " initial_heap_size: " SIZE_FORMAT 1218 " max_heap: " SIZE_FORMAT, 1219 min_heap_size(), InitialHeapSize, max_heap); 1220 } 1221 size_t min_new = preferred_max_new_size; 1222 if (FLAG_IS_CMDLINE(NewSize)) { 1223 min_new = NewSize; 1224 } 1225 if (max_heap > min_new && min_heap_size() > min_new) { 1226 // Unless explicitly requested otherwise, make young gen 1227 // at least min_new, and at most preferred_max_new_size. 1228 if (FLAG_IS_DEFAULT(NewSize)) { 1229 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1230 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1231 if (PrintGCDetails && Verbose) { 1232 // Too early to use gclog_or_tty 1233 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1234 } 1235 } 1236 // Unless explicitly requested otherwise, size old gen 1237 // so it's NewRatio x of NewSize. 1238 if (FLAG_IS_DEFAULT(OldSize)) { 1239 if (max_heap > NewSize) { 1240 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1241 if (PrintGCDetails && Verbose) { 1242 // Too early to use gclog_or_tty 1243 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1244 } 1245 } 1246 } 1247 } 1248 } 1249 // Unless explicitly requested otherwise, definitely 1250 // promote all objects surviving "tenuring_default" scavenges. 1251 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1252 FLAG_IS_DEFAULT(SurvivorRatio)) { 1253 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1254 } 1255 // If we decided above (or user explicitly requested) 1256 // `promote all' (via MaxTenuringThreshold := 0), 1257 // prefer minuscule survivor spaces so as not to waste 1258 // space for (non-existent) survivors 1259 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1260 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1261 } 1262 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1263 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1264 // This is done in order to make ParNew+CMS configuration to work 1265 // with YoungPLABSize and OldPLABSize options. 1266 // See CR 6362902. 1267 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1268 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1269 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1270 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1271 // the value (either from the command line or ergonomics) of 1272 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1273 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1274 } else { 1275 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1276 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1277 // we'll let it to take precedence. 1278 jio_fprintf(defaultStream::error_stream(), 1279 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1280 " options are specified for the CMS collector." 1281 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1282 } 1283 } 1284 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1285 // OldPLAB sizing manually turned off: Use a larger default setting, 1286 // unless it was manually specified. This is because a too-low value 1287 // will slow down scavenges. 1288 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1289 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1290 } 1291 } 1292 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1293 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1294 // If either of the static initialization defaults have changed, note this 1295 // modification. 1296 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1297 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1298 } 1299 if (PrintGCDetails && Verbose) { 1300 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1301 MarkStackSize / K, MarkStackSizeMax / K); 1302 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1303 } 1304 } 1305 #endif // INCLUDE_ALL_GCS 1306 1307 void set_object_alignment() { 1308 // Object alignment. 1309 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1310 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1311 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1312 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1313 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1314 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1315 1316 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1317 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1318 1319 // Oop encoding heap max 1320 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1321 1322 #if INCLUDE_ALL_GCS 1323 // Set CMS global values 1324 CompactibleFreeListSpace::set_cms_values(); 1325 #endif // INCLUDE_ALL_GCS 1326 } 1327 1328 bool verify_object_alignment() { 1329 // Object alignment. 1330 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1331 jio_fprintf(defaultStream::error_stream(), 1332 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1333 (int)ObjectAlignmentInBytes); 1334 return false; 1335 } 1336 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1337 jio_fprintf(defaultStream::error_stream(), 1338 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1339 (int)ObjectAlignmentInBytes, BytesPerLong); 1340 return false; 1341 } 1342 // It does not make sense to have big object alignment 1343 // since a space lost due to alignment will be greater 1344 // then a saved space from compressed oops. 1345 if ((int)ObjectAlignmentInBytes > 256) { 1346 jio_fprintf(defaultStream::error_stream(), 1347 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1348 (int)ObjectAlignmentInBytes); 1349 return false; 1350 } 1351 // In case page size is very small. 1352 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1353 jio_fprintf(defaultStream::error_stream(), 1354 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1355 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1356 return false; 1357 } 1358 return true; 1359 } 1360 1361 inline uintx max_heap_for_compressed_oops() { 1362 // Avoid sign flip. 1363 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) { 1364 return 0; 1365 } 1366 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size()); 1367 NOT_LP64(ShouldNotReachHere(); return 0); 1368 } 1369 1370 bool Arguments::should_auto_select_low_pause_collector() { 1371 if (UseAutoGCSelectPolicy && 1372 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1373 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1374 if (PrintGCDetails) { 1375 // Cannot use gclog_or_tty yet. 1376 tty->print_cr("Automatic selection of the low pause collector" 1377 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1378 } 1379 return true; 1380 } 1381 return false; 1382 } 1383 1384 void Arguments::set_ergonomics_flags() { 1385 1386 if (os::is_server_class_machine()) { 1387 // If no other collector is requested explicitly, 1388 // let the VM select the collector based on 1389 // machine class and automatic selection policy. 1390 if (!UseSerialGC && 1391 !UseConcMarkSweepGC && 1392 !UseG1GC && 1393 !UseParNewGC && 1394 FLAG_IS_DEFAULT(UseParallelGC)) { 1395 if (should_auto_select_low_pause_collector()) { 1396 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1397 } else { 1398 FLAG_SET_ERGO(bool, UseParallelGC, true); 1399 } 1400 } 1401 // Shared spaces work fine with other GCs but causes bytecode rewriting 1402 // to be disabled, which hurts interpreter performance and decreases 1403 // server performance. On server class machines, keep the default 1404 // off unless it is asked for. Future work: either add bytecode rewriting 1405 // at link time, or rewrite bytecodes in non-shared methods. 1406 if (!DumpSharedSpaces && !RequireSharedSpaces) { 1407 no_shared_spaces(); 1408 } 1409 } 1410 1411 #ifndef ZERO 1412 #ifdef _LP64 1413 // Check that UseCompressedOops can be set with the max heap size allocated 1414 // by ergonomics. 1415 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1416 #if !defined(COMPILER1) || defined(TIERED) 1417 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1418 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1419 } 1420 #endif 1421 #ifdef _WIN64 1422 if (UseLargePages && UseCompressedOops) { 1423 // Cannot allocate guard pages for implicit checks in indexed addressing 1424 // mode, when large pages are specified on windows. 1425 // This flag could be switched ON if narrow oop base address is set to 0, 1426 // see code in Universe::initialize_heap(). 1427 Universe::set_narrow_oop_use_implicit_null_checks(false); 1428 } 1429 #endif // _WIN64 1430 } else { 1431 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1432 warning("Max heap size too large for Compressed Oops"); 1433 FLAG_SET_DEFAULT(UseCompressedOops, false); 1434 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1435 } 1436 } 1437 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1438 if (!UseCompressedOops) { 1439 if (UseCompressedKlassPointers) { 1440 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1441 } 1442 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1443 } else { 1444 // Turn on UseCompressedKlassPointers too 1445 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1446 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1447 } 1448 // Set the ClassMetaspaceSize to something that will not need to be 1449 // expanded, since it cannot be expanded. 1450 if (UseCompressedKlassPointers) { 1451 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) { 1452 warning("Class metaspace size is too large for UseCompressedKlassPointers"); 1453 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1454 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) { 1455 // 100,000 classes seems like a good size, so 100M assumes around 1K 1456 // per klass. The vtable and oopMap is embedded so we don't have a fixed 1457 // size per klass. Eventually, this will be parameterized because it 1458 // would also be useful to determine the optimal size of the 1459 // systemDictionary. 1460 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M); 1461 } 1462 } 1463 } 1464 // Also checks that certain machines are slower with compressed oops 1465 // in vm_version initialization code. 1466 #endif // _LP64 1467 #endif // !ZERO 1468 } 1469 1470 void Arguments::set_parallel_gc_flags() { 1471 assert(UseParallelGC || UseParallelOldGC, "Error"); 1472 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1473 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1474 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1475 } 1476 FLAG_SET_DEFAULT(UseParallelGC, true); 1477 1478 // If no heap maximum was requested explicitly, use some reasonable fraction 1479 // of the physical memory, up to a maximum of 1GB. 1480 FLAG_SET_DEFAULT(ParallelGCThreads, 1481 Abstract_VM_Version::parallel_worker_threads()); 1482 if (ParallelGCThreads == 0) { 1483 jio_fprintf(defaultStream::error_stream(), 1484 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1485 vm_exit(1); 1486 } 1487 1488 1489 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1490 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1491 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1492 // See CR 6362902 for details. 1493 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1494 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1495 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1496 } 1497 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1498 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1499 } 1500 } 1501 1502 if (UseParallelOldGC) { 1503 // Par compact uses lower default values since they are treated as 1504 // minimums. These are different defaults because of the different 1505 // interpretation and are not ergonomically set. 1506 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1507 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1508 } 1509 } 1510 } 1511 1512 void Arguments::set_g1_gc_flags() { 1513 assert(UseG1GC, "Error"); 1514 #ifdef COMPILER1 1515 FastTLABRefill = false; 1516 #endif 1517 FLAG_SET_DEFAULT(ParallelGCThreads, 1518 Abstract_VM_Version::parallel_worker_threads()); 1519 if (ParallelGCThreads == 0) { 1520 FLAG_SET_DEFAULT(ParallelGCThreads, 1521 Abstract_VM_Version::parallel_worker_threads()); 1522 } 1523 1524 // MarkStackSize will be set (if it hasn't been set by the user) 1525 // when concurrent marking is initialized. 1526 // Its value will be based upon the number of parallel marking threads. 1527 // But we do set the maximum mark stack size here. 1528 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1529 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1530 } 1531 1532 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1533 // In G1, we want the default GC overhead goal to be higher than 1534 // say in PS. So we set it here to 10%. Otherwise the heap might 1535 // be expanded more aggressively than we would like it to. In 1536 // fact, even 10% seems to not be high enough in some cases 1537 // (especially small GC stress tests that the main thing they do 1538 // is allocation). We might consider increase it further. 1539 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1540 } 1541 1542 if (PrintGCDetails && Verbose) { 1543 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1544 MarkStackSize / K, MarkStackSizeMax / K); 1545 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1546 } 1547 } 1548 1549 void Arguments::set_heap_size() { 1550 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1551 // Deprecated flag 1552 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1553 } 1554 1555 const julong phys_mem = 1556 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1557 : (julong)MaxRAM; 1558 1559 // If the maximum heap size has not been set with -Xmx, 1560 // then set it as fraction of the size of physical memory, 1561 // respecting the maximum and minimum sizes of the heap. 1562 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1563 julong reasonable_max = phys_mem / MaxRAMFraction; 1564 1565 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1566 // Small physical memory, so use a minimum fraction of it for the heap 1567 reasonable_max = phys_mem / MinRAMFraction; 1568 } else { 1569 // Not-small physical memory, so require a heap at least 1570 // as large as MaxHeapSize 1571 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1572 } 1573 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1574 // Limit the heap size to ErgoHeapSizeLimit 1575 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1576 } 1577 if (UseCompressedOops) { 1578 // Limit the heap size to the maximum possible when using compressed oops 1579 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1580 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1581 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1582 // but it should be not less than default MaxHeapSize. 1583 max_coop_heap -= HeapBaseMinAddress; 1584 } 1585 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1586 } 1587 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1588 1589 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1590 // An initial heap size was specified on the command line, 1591 // so be sure that the maximum size is consistent. Done 1592 // after call to allocatable_physical_memory because that 1593 // method might reduce the allocation size. 1594 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1595 } 1596 1597 if (PrintGCDetails && Verbose) { 1598 // Cannot use gclog_or_tty yet. 1599 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1600 } 1601 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1602 } 1603 1604 // If the initial_heap_size has not been set with InitialHeapSize 1605 // or -Xms, then set it as fraction of the size of physical memory, 1606 // respecting the maximum and minimum sizes of the heap. 1607 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1608 julong reasonable_minimum = (julong)(OldSize + NewSize); 1609 1610 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1611 1612 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1613 1614 julong reasonable_initial = phys_mem / InitialRAMFraction; 1615 1616 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1617 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1618 1619 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1620 1621 if (PrintGCDetails && Verbose) { 1622 // Cannot use gclog_or_tty yet. 1623 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1624 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1625 } 1626 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1627 set_min_heap_size((uintx)reasonable_minimum); 1628 } 1629 } 1630 1631 // This must be called after ergonomics because we want bytecode rewriting 1632 // if the server compiler is used, or if UseSharedSpaces is disabled. 1633 void Arguments::set_bytecode_flags() { 1634 // Better not attempt to store into a read-only space. 1635 if (UseSharedSpaces) { 1636 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1637 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1638 } 1639 1640 if (!RewriteBytecodes) { 1641 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1642 } 1643 } 1644 1645 // Aggressive optimization flags -XX:+AggressiveOpts 1646 void Arguments::set_aggressive_opts_flags() { 1647 #ifdef COMPILER2 1648 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1649 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1650 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1651 } 1652 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1653 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1654 } 1655 1656 // Feed the cache size setting into the JDK 1657 char buffer[1024]; 1658 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1659 add_property(buffer); 1660 } 1661 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1662 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1663 } 1664 #endif 1665 1666 if (AggressiveOpts) { 1667 // Sample flag setting code 1668 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1669 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1670 // } 1671 } 1672 } 1673 1674 //=========================================================================================================== 1675 // Parsing of java.compiler property 1676 1677 void Arguments::process_java_compiler_argument(char* arg) { 1678 // For backwards compatibility, Djava.compiler=NONE or "" 1679 // causes us to switch to -Xint mode UNLESS -Xdebug 1680 // is also specified. 1681 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1682 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1683 } 1684 } 1685 1686 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1687 _sun_java_launcher = strdup(launcher); 1688 if (strcmp("gamma", _sun_java_launcher) == 0) { 1689 _created_by_gamma_launcher = true; 1690 } 1691 } 1692 1693 bool Arguments::created_by_java_launcher() { 1694 assert(_sun_java_launcher != NULL, "property must have value"); 1695 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1696 } 1697 1698 bool Arguments::created_by_gamma_launcher() { 1699 return _created_by_gamma_launcher; 1700 } 1701 1702 //=========================================================================================================== 1703 // Parsing of main arguments 1704 1705 bool Arguments::verify_interval(uintx val, uintx min, 1706 uintx max, const char* name) { 1707 // Returns true iff value is in the inclusive interval [min..max] 1708 // false, otherwise. 1709 if (val >= min && val <= max) { 1710 return true; 1711 } 1712 jio_fprintf(defaultStream::error_stream(), 1713 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1714 " and " UINTX_FORMAT "\n", 1715 name, val, min, max); 1716 return false; 1717 } 1718 1719 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1720 // Returns true if given value is at least specified min threshold 1721 // false, otherwise. 1722 if (val >= min ) { 1723 return true; 1724 } 1725 jio_fprintf(defaultStream::error_stream(), 1726 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1727 name, val, min); 1728 return false; 1729 } 1730 1731 bool Arguments::verify_percentage(uintx value, const char* name) { 1732 if (value <= 100) { 1733 return true; 1734 } 1735 jio_fprintf(defaultStream::error_stream(), 1736 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1737 name, value); 1738 return false; 1739 } 1740 1741 static void force_serial_gc() { 1742 FLAG_SET_DEFAULT(UseSerialGC, true); 1743 FLAG_SET_DEFAULT(UseParNewGC, false); 1744 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1745 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1746 FLAG_SET_DEFAULT(UseParallelGC, false); 1747 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1748 FLAG_SET_DEFAULT(UseG1GC, false); 1749 } 1750 1751 static bool verify_serial_gc_flags() { 1752 return (UseSerialGC && 1753 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1754 UseParallelGC || UseParallelOldGC)); 1755 } 1756 1757 // check if do gclog rotation 1758 // +UseGCLogFileRotation is a must, 1759 // no gc log rotation when log file not supplied or 1760 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1761 void check_gclog_consistency() { 1762 if (UseGCLogFileRotation) { 1763 if ((Arguments::gc_log_filename() == NULL) || 1764 (NumberOfGCLogFiles == 0) || 1765 (GCLogFileSize == 0)) { 1766 jio_fprintf(defaultStream::output_stream(), 1767 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1768 "where num_of_file > 0 and num_of_size > 0\n" 1769 "GC log rotation is turned off\n"); 1770 UseGCLogFileRotation = false; 1771 } 1772 } 1773 1774 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1775 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1776 jio_fprintf(defaultStream::output_stream(), 1777 "GCLogFileSize changed to minimum 8K\n"); 1778 } 1779 } 1780 1781 // Check consistency of GC selection 1782 bool Arguments::check_gc_consistency() { 1783 check_gclog_consistency(); 1784 bool status = true; 1785 // Ensure that the user has not selected conflicting sets 1786 // of collectors. [Note: this check is merely a user convenience; 1787 // collectors over-ride each other so that only a non-conflicting 1788 // set is selected; however what the user gets is not what they 1789 // may have expected from the combination they asked for. It's 1790 // better to reduce user confusion by not allowing them to 1791 // select conflicting combinations. 1792 uint i = 0; 1793 if (UseSerialGC) i++; 1794 if (UseConcMarkSweepGC || UseParNewGC) i++; 1795 if (UseParallelGC || UseParallelOldGC) i++; 1796 if (UseG1GC) i++; 1797 if (i > 1) { 1798 jio_fprintf(defaultStream::error_stream(), 1799 "Conflicting collector combinations in option list; " 1800 "please refer to the release notes for the combinations " 1801 "allowed\n"); 1802 status = false; 1803 } 1804 1805 return status; 1806 } 1807 1808 void Arguments::check_gc_flags() { 1809 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1810 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1811 "and will likely be removed in future release"); 1812 } 1813 } 1814 1815 void Arguments::check_deprecated_gcs() { 1816 if (UseConcMarkSweepGC && !UseParNewGC) { 1817 warning("Using the DefNew young collector with the CMS collector is deprecated " 1818 "and will likely be removed in a future release"); 1819 } 1820 1821 if (UseParNewGC && !UseConcMarkSweepGC) { 1822 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1823 // set up UseSerialGC properly, so that can't be used in the check here. 1824 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1825 "and will likely be removed in a future release"); 1826 } 1827 1828 if (CMSIncrementalMode) { 1829 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1830 } 1831 } 1832 1833 // Check stack pages settings 1834 bool Arguments::check_stack_pages() 1835 { 1836 bool status = true; 1837 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1838 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1839 // greater stack shadow pages can't generate instruction to bang stack 1840 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1841 return status; 1842 } 1843 1844 // Check the consistency of vm_init_args 1845 bool Arguments::check_vm_args_consistency() { 1846 // Method for adding checks for flag consistency. 1847 // The intent is to warn the user of all possible conflicts, 1848 // before returning an error. 1849 // Note: Needs platform-dependent factoring. 1850 bool status = true; 1851 1852 #if ( (defined(COMPILER2) && defined(SPARC))) 1853 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1854 // on sparc doesn't require generation of a stub as is the case on, e.g., 1855 // x86. Normally, VM_Version_init must be called from init_globals in 1856 // init.cpp, which is called by the initial java thread *after* arguments 1857 // have been parsed. VM_Version_init gets called twice on sparc. 1858 extern void VM_Version_init(); 1859 VM_Version_init(); 1860 if (!VM_Version::has_v9()) { 1861 jio_fprintf(defaultStream::error_stream(), 1862 "V8 Machine detected, Server requires V9\n"); 1863 status = false; 1864 } 1865 #endif /* COMPILER2 && SPARC */ 1866 1867 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1868 // builds so the cost of stack banging can be measured. 1869 #if (defined(PRODUCT) && defined(SOLARIS)) 1870 if (!UseBoundThreads && !UseStackBanging) { 1871 jio_fprintf(defaultStream::error_stream(), 1872 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1873 1874 status = false; 1875 } 1876 #endif 1877 1878 if (TLABRefillWasteFraction == 0) { 1879 jio_fprintf(defaultStream::error_stream(), 1880 "TLABRefillWasteFraction should be a denominator, " 1881 "not " SIZE_FORMAT "\n", 1882 TLABRefillWasteFraction); 1883 status = false; 1884 } 1885 1886 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1887 "AdaptiveSizePolicyWeight"); 1888 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1889 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1890 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1891 1892 // Divide by bucket size to prevent a large size from causing rollover when 1893 // calculating amount of memory needed to be allocated for the String table. 1894 status = status && verify_interval(StringTableSize, defaultStringTableSize, 1895 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1896 1897 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1898 jio_fprintf(defaultStream::error_stream(), 1899 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1900 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1901 MinHeapFreeRatio, MaxHeapFreeRatio); 1902 status = false; 1903 } 1904 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1905 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1906 1907 // Min/MaxMetaspaceFreeRatio 1908 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 1909 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 1910 1911 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 1912 jio_fprintf(defaultStream::error_stream(), 1913 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 1914 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 1915 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 1916 MinMetaspaceFreeRatio, 1917 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 1918 MaxMetaspaceFreeRatio); 1919 status = false; 1920 } 1921 1922 // Trying to keep 100% free is not practical 1923 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 1924 1925 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1926 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1927 } 1928 1929 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1930 // Settings to encourage splitting. 1931 if (!FLAG_IS_CMDLINE(NewRatio)) { 1932 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 1933 } 1934 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1935 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1936 } 1937 } 1938 1939 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1940 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1941 if (GCTimeLimit == 100) { 1942 // Turn off gc-overhead-limit-exceeded checks 1943 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1944 } 1945 1946 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1947 1948 status = status && check_gc_consistency(); 1949 status = status && check_stack_pages(); 1950 1951 if (_has_alloc_profile) { 1952 if (UseParallelGC || UseParallelOldGC) { 1953 jio_fprintf(defaultStream::error_stream(), 1954 "error: invalid argument combination.\n" 1955 "Allocation profiling (-Xaprof) cannot be used together with " 1956 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1957 status = false; 1958 } 1959 if (UseConcMarkSweepGC) { 1960 jio_fprintf(defaultStream::error_stream(), 1961 "error: invalid argument combination.\n" 1962 "Allocation profiling (-Xaprof) cannot be used together with " 1963 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1964 status = false; 1965 } 1966 } 1967 1968 if (CMSIncrementalMode) { 1969 if (!UseConcMarkSweepGC) { 1970 jio_fprintf(defaultStream::error_stream(), 1971 "error: invalid argument combination.\n" 1972 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1973 "selected in order\nto use CMSIncrementalMode.\n"); 1974 status = false; 1975 } else { 1976 status = status && verify_percentage(CMSIncrementalDutyCycle, 1977 "CMSIncrementalDutyCycle"); 1978 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1979 "CMSIncrementalDutyCycleMin"); 1980 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1981 "CMSIncrementalSafetyFactor"); 1982 status = status && verify_percentage(CMSIncrementalOffset, 1983 "CMSIncrementalOffset"); 1984 status = status && verify_percentage(CMSExpAvgFactor, 1985 "CMSExpAvgFactor"); 1986 // If it was not set on the command line, set 1987 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1988 if (CMSInitiatingOccupancyFraction < 0) { 1989 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1990 } 1991 } 1992 } 1993 1994 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1995 // insists that we hold the requisite locks so that the iteration is 1996 // MT-safe. For the verification at start-up and shut-down, we don't 1997 // yet have a good way of acquiring and releasing these locks, 1998 // which are not visible at the CollectedHeap level. We want to 1999 // be able to acquire these locks and then do the iteration rather 2000 // than just disable the lock verification. This will be fixed under 2001 // bug 4788986. 2002 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2003 if (VerifyGCStartAt == 0) { 2004 warning("Heap verification at start-up disabled " 2005 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2006 VerifyGCStartAt = 1; // Disable verification at start-up 2007 } 2008 if (VerifyBeforeExit) { 2009 warning("Heap verification at shutdown disabled " 2010 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2011 VerifyBeforeExit = false; // Disable verification at shutdown 2012 } 2013 } 2014 2015 // Note: only executed in non-PRODUCT mode 2016 if (!UseAsyncConcMarkSweepGC && 2017 (ExplicitGCInvokesConcurrent || 2018 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2019 jio_fprintf(defaultStream::error_stream(), 2020 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2021 " with -UseAsyncConcMarkSweepGC"); 2022 status = false; 2023 } 2024 2025 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2026 2027 #if INCLUDE_ALL_GCS 2028 if (UseG1GC) { 2029 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2030 "InitiatingHeapOccupancyPercent"); 2031 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2032 "G1RefProcDrainInterval"); 2033 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2034 "G1ConcMarkStepDurationMillis"); 2035 } 2036 #endif // INCLUDE_ALL_GCS 2037 2038 status = status && verify_interval(RefDiscoveryPolicy, 2039 ReferenceProcessor::DiscoveryPolicyMin, 2040 ReferenceProcessor::DiscoveryPolicyMax, 2041 "RefDiscoveryPolicy"); 2042 2043 // Limit the lower bound of this flag to 1 as it is used in a division 2044 // expression. 2045 status = status && verify_interval(TLABWasteTargetPercent, 2046 1, 100, "TLABWasteTargetPercent"); 2047 2048 status = status && verify_object_alignment(); 2049 2050 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 2051 "ClassMetaspaceSize"); 2052 2053 status = status && verify_interval(MarkStackSizeMax, 2054 1, (max_jint - 1), "MarkStackSizeMax"); 2055 2056 #ifdef SPARC 2057 if (UseConcMarkSweepGC || UseG1GC) { 2058 // Issue a stern warning if the user has explicitly set 2059 // UseMemSetInBOT (it is known to cause issues), but allow 2060 // use for experimentation and debugging. 2061 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2062 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2063 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2064 " on sun4v; please understand that you are using at your own risk!"); 2065 } 2066 } 2067 #endif // SPARC 2068 2069 if (PrintNMTStatistics) { 2070 #if INCLUDE_NMT 2071 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2072 #endif // INCLUDE_NMT 2073 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2074 PrintNMTStatistics = false; 2075 #if INCLUDE_NMT 2076 } 2077 #endif 2078 } 2079 2080 return status; 2081 } 2082 2083 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2084 const char* option_type) { 2085 if (ignore) return false; 2086 2087 const char* spacer = " "; 2088 if (option_type == NULL) { 2089 option_type = ++spacer; // Set both to the empty string. 2090 } 2091 2092 if (os::obsolete_option(option)) { 2093 jio_fprintf(defaultStream::error_stream(), 2094 "Obsolete %s%soption: %s\n", option_type, spacer, 2095 option->optionString); 2096 return false; 2097 } else { 2098 jio_fprintf(defaultStream::error_stream(), 2099 "Unrecognized %s%soption: %s\n", option_type, spacer, 2100 option->optionString); 2101 return true; 2102 } 2103 } 2104 2105 static const char* user_assertion_options[] = { 2106 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2107 }; 2108 2109 static const char* system_assertion_options[] = { 2110 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2111 }; 2112 2113 // Return true if any of the strings in null-terminated array 'names' matches. 2114 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2115 // the option must match exactly. 2116 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2117 bool tail_allowed) { 2118 for (/* empty */; *names != NULL; ++names) { 2119 if (match_option(option, *names, tail)) { 2120 if (**tail == '\0' || tail_allowed && **tail == ':') { 2121 return true; 2122 } 2123 } 2124 } 2125 return false; 2126 } 2127 2128 bool Arguments::parse_uintx(const char* value, 2129 uintx* uintx_arg, 2130 uintx min_size) { 2131 2132 // Check the sign first since atomull() parses only unsigned values. 2133 bool value_is_positive = !(*value == '-'); 2134 2135 if (value_is_positive) { 2136 julong n; 2137 bool good_return = atomull(value, &n); 2138 if (good_return) { 2139 bool above_minimum = n >= min_size; 2140 bool value_is_too_large = n > max_uintx; 2141 2142 if (above_minimum && !value_is_too_large) { 2143 *uintx_arg = n; 2144 return true; 2145 } 2146 } 2147 } 2148 return false; 2149 } 2150 2151 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2152 julong* long_arg, 2153 julong min_size) { 2154 if (!atomull(s, long_arg)) return arg_unreadable; 2155 return check_memory_size(*long_arg, min_size); 2156 } 2157 2158 // Parse JavaVMInitArgs structure 2159 2160 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2161 // For components of the system classpath. 2162 SysClassPath scp(Arguments::get_sysclasspath()); 2163 bool scp_assembly_required = false; 2164 2165 // Save default settings for some mode flags 2166 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2167 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2168 Arguments::_ClipInlining = ClipInlining; 2169 Arguments::_BackgroundCompilation = BackgroundCompilation; 2170 2171 // Setup flags for mixed which is the default 2172 set_mode_flags(_mixed); 2173 2174 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2175 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2176 if (result != JNI_OK) { 2177 return result; 2178 } 2179 2180 // Parse JavaVMInitArgs structure passed in 2181 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2182 if (result != JNI_OK) { 2183 return result; 2184 } 2185 2186 if (AggressiveOpts) { 2187 // Insert alt-rt.jar between user-specified bootclasspath 2188 // prefix and the default bootclasspath. os::set_boot_path() 2189 // uses meta_index_dir as the default bootclasspath directory. 2190 const char* altclasses_jar = "alt-rt.jar"; 2191 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2192 strlen(altclasses_jar); 2193 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2194 strcpy(altclasses_path, get_meta_index_dir()); 2195 strcat(altclasses_path, altclasses_jar); 2196 scp.add_suffix_to_prefix(altclasses_path); 2197 scp_assembly_required = true; 2198 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2199 } 2200 2201 if (WhiteBoxAPI) { 2202 // Append wb.jar to bootclasspath if enabled 2203 const char* wb_jar = "wb.jar"; 2204 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 + 2205 strlen(wb_jar); 2206 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal); 2207 strcpy(wb_path, get_meta_index_dir()); 2208 strcat(wb_path, wb_jar); 2209 scp.add_suffix(wb_path); 2210 scp_assembly_required = true; 2211 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal); 2212 } 2213 2214 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2215 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2216 if (result != JNI_OK) { 2217 return result; 2218 } 2219 2220 // Do final processing now that all arguments have been parsed 2221 result = finalize_vm_init_args(&scp, scp_assembly_required); 2222 if (result != JNI_OK) { 2223 return result; 2224 } 2225 2226 return JNI_OK; 2227 } 2228 2229 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2230 SysClassPath* scp_p, 2231 bool* scp_assembly_required_p, 2232 FlagValueOrigin origin) { 2233 // Remaining part of option string 2234 const char* tail; 2235 2236 // iterate over arguments 2237 for (int index = 0; index < args->nOptions; index++) { 2238 bool is_absolute_path = false; // for -agentpath vs -agentlib 2239 2240 const JavaVMOption* option = args->options + index; 2241 2242 if (!match_option(option, "-Djava.class.path", &tail) && 2243 !match_option(option, "-Dsun.java.command", &tail) && 2244 !match_option(option, "-Dsun.java.launcher", &tail)) { 2245 2246 // add all jvm options to the jvm_args string. This string 2247 // is used later to set the java.vm.args PerfData string constant. 2248 // the -Djava.class.path and the -Dsun.java.command options are 2249 // omitted from jvm_args string as each have their own PerfData 2250 // string constant object. 2251 build_jvm_args(option->optionString); 2252 } 2253 2254 // -verbose:[class/gc/jni] 2255 if (match_option(option, "-verbose", &tail)) { 2256 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2257 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2258 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2259 } else if (!strcmp(tail, ":gc")) { 2260 FLAG_SET_CMDLINE(bool, PrintGC, true); 2261 } else if (!strcmp(tail, ":jni")) { 2262 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2263 } 2264 // -da / -ea / -disableassertions / -enableassertions 2265 // These accept an optional class/package name separated by a colon, e.g., 2266 // -da:java.lang.Thread. 2267 } else if (match_option(option, user_assertion_options, &tail, true)) { 2268 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2269 if (*tail == '\0') { 2270 JavaAssertions::setUserClassDefault(enable); 2271 } else { 2272 assert(*tail == ':', "bogus match by match_option()"); 2273 JavaAssertions::addOption(tail + 1, enable); 2274 } 2275 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2276 } else if (match_option(option, system_assertion_options, &tail, false)) { 2277 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2278 JavaAssertions::setSystemClassDefault(enable); 2279 // -bootclasspath: 2280 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2281 scp_p->reset_path(tail); 2282 *scp_assembly_required_p = true; 2283 // -bootclasspath/a: 2284 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2285 scp_p->add_suffix(tail); 2286 *scp_assembly_required_p = true; 2287 // -bootclasspath/p: 2288 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2289 scp_p->add_prefix(tail); 2290 *scp_assembly_required_p = true; 2291 // -Xrun 2292 } else if (match_option(option, "-Xrun", &tail)) { 2293 if (tail != NULL) { 2294 const char* pos = strchr(tail, ':'); 2295 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2296 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2297 name[len] = '\0'; 2298 2299 char *options = NULL; 2300 if(pos != NULL) { 2301 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2302 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2303 } 2304 #if !INCLUDE_JVMTI 2305 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2306 warning("profiling and debugging agents are not supported in this VM"); 2307 } else 2308 #endif // !INCLUDE_JVMTI 2309 add_init_library(name, options); 2310 } 2311 // -agentlib and -agentpath 2312 } else if (match_option(option, "-agentlib:", &tail) || 2313 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2314 if(tail != NULL) { 2315 const char* pos = strchr(tail, '='); 2316 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2317 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2318 name[len] = '\0'; 2319 2320 char *options = NULL; 2321 if(pos != NULL) { 2322 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2323 } 2324 #if !INCLUDE_JVMTI 2325 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2326 warning("profiling and debugging agents are not supported in this VM"); 2327 } else 2328 #endif // !INCLUDE_JVMTI 2329 add_init_agent(name, options, is_absolute_path); 2330 2331 } 2332 // -javaagent 2333 } else if (match_option(option, "-javaagent:", &tail)) { 2334 #if !INCLUDE_JVMTI 2335 warning("Instrumentation agents are not supported in this VM"); 2336 #else 2337 if(tail != NULL) { 2338 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2339 add_init_agent("instrument", options, false); 2340 } 2341 #endif // !INCLUDE_JVMTI 2342 // -Xnoclassgc 2343 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2344 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2345 // -Xincgc: i-CMS 2346 } else if (match_option(option, "-Xincgc", &tail)) { 2347 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2348 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2349 // -Xnoincgc: no i-CMS 2350 } else if (match_option(option, "-Xnoincgc", &tail)) { 2351 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2352 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2353 // -Xconcgc 2354 } else if (match_option(option, "-Xconcgc", &tail)) { 2355 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2356 // -Xnoconcgc 2357 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2358 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2359 // -Xbatch 2360 } else if (match_option(option, "-Xbatch", &tail)) { 2361 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2362 // -Xmn for compatibility with other JVM vendors 2363 } else if (match_option(option, "-Xmn", &tail)) { 2364 julong long_initial_eden_size = 0; 2365 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2366 if (errcode != arg_in_range) { 2367 jio_fprintf(defaultStream::error_stream(), 2368 "Invalid initial eden size: %s\n", option->optionString); 2369 describe_range_error(errcode); 2370 return JNI_EINVAL; 2371 } 2372 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2373 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2374 // -Xms 2375 } else if (match_option(option, "-Xms", &tail)) { 2376 julong long_initial_heap_size = 0; 2377 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2378 if (errcode != arg_in_range) { 2379 jio_fprintf(defaultStream::error_stream(), 2380 "Invalid initial heap size: %s\n", option->optionString); 2381 describe_range_error(errcode); 2382 return JNI_EINVAL; 2383 } 2384 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2385 // Currently the minimum size and the initial heap sizes are the same. 2386 set_min_heap_size(InitialHeapSize); 2387 // -Xmx 2388 } else if (match_option(option, "-Xmx", &tail)) { 2389 julong long_max_heap_size = 0; 2390 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2391 if (errcode != arg_in_range) { 2392 jio_fprintf(defaultStream::error_stream(), 2393 "Invalid maximum heap size: %s\n", option->optionString); 2394 describe_range_error(errcode); 2395 return JNI_EINVAL; 2396 } 2397 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2398 // Xmaxf 2399 } else if (match_option(option, "-Xmaxf", &tail)) { 2400 int maxf = (int)(atof(tail) * 100); 2401 if (maxf < 0 || maxf > 100) { 2402 jio_fprintf(defaultStream::error_stream(), 2403 "Bad max heap free percentage size: %s\n", 2404 option->optionString); 2405 return JNI_EINVAL; 2406 } else { 2407 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2408 } 2409 // Xminf 2410 } else if (match_option(option, "-Xminf", &tail)) { 2411 int minf = (int)(atof(tail) * 100); 2412 if (minf < 0 || minf > 100) { 2413 jio_fprintf(defaultStream::error_stream(), 2414 "Bad min heap free percentage size: %s\n", 2415 option->optionString); 2416 return JNI_EINVAL; 2417 } else { 2418 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2419 } 2420 // -Xss 2421 } else if (match_option(option, "-Xss", &tail)) { 2422 julong long_ThreadStackSize = 0; 2423 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2424 if (errcode != arg_in_range) { 2425 jio_fprintf(defaultStream::error_stream(), 2426 "Invalid thread stack size: %s\n", option->optionString); 2427 describe_range_error(errcode); 2428 return JNI_EINVAL; 2429 } 2430 // Internally track ThreadStackSize in units of 1024 bytes. 2431 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2432 round_to((int)long_ThreadStackSize, K) / K); 2433 // -Xoss 2434 } else if (match_option(option, "-Xoss", &tail)) { 2435 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2436 // -Xmaxjitcodesize 2437 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2438 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2439 julong long_ReservedCodeCacheSize = 0; 2440 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2441 (size_t)InitialCodeCacheSize); 2442 if (errcode != arg_in_range) { 2443 jio_fprintf(defaultStream::error_stream(), 2444 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2445 option->optionString, InitialCodeCacheSize/K); 2446 describe_range_error(errcode); 2447 return JNI_EINVAL; 2448 } 2449 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2450 // -green 2451 } else if (match_option(option, "-green", &tail)) { 2452 jio_fprintf(defaultStream::error_stream(), 2453 "Green threads support not available\n"); 2454 return JNI_EINVAL; 2455 // -native 2456 } else if (match_option(option, "-native", &tail)) { 2457 // HotSpot always uses native threads, ignore silently for compatibility 2458 // -Xsqnopause 2459 } else if (match_option(option, "-Xsqnopause", &tail)) { 2460 // EVM option, ignore silently for compatibility 2461 // -Xrs 2462 } else if (match_option(option, "-Xrs", &tail)) { 2463 // Classic/EVM option, new functionality 2464 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2465 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2466 // change default internal VM signals used - lower case for back compat 2467 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2468 // -Xoptimize 2469 } else if (match_option(option, "-Xoptimize", &tail)) { 2470 // EVM option, ignore silently for compatibility 2471 // -Xprof 2472 } else if (match_option(option, "-Xprof", &tail)) { 2473 #if INCLUDE_FPROF 2474 _has_profile = true; 2475 #else // INCLUDE_FPROF 2476 // do we have to exit? 2477 warning("Flat profiling is not supported in this VM."); 2478 #endif // INCLUDE_FPROF 2479 // -Xaprof 2480 } else if (match_option(option, "-Xaprof", &tail)) { 2481 _has_alloc_profile = true; 2482 // -Xconcurrentio 2483 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2484 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2485 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2486 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2487 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2488 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2489 2490 // -Xinternalversion 2491 } else if (match_option(option, "-Xinternalversion", &tail)) { 2492 jio_fprintf(defaultStream::output_stream(), "%s\n", 2493 VM_Version::internal_vm_info_string()); 2494 vm_exit(0); 2495 #ifndef PRODUCT 2496 // -Xprintflags 2497 } else if (match_option(option, "-Xprintflags", &tail)) { 2498 CommandLineFlags::printFlags(tty, false); 2499 vm_exit(0); 2500 #endif 2501 // -D 2502 } else if (match_option(option, "-D", &tail)) { 2503 if (!add_property(tail)) { 2504 return JNI_ENOMEM; 2505 } 2506 // Out of the box management support 2507 if (match_option(option, "-Dcom.sun.management", &tail)) { 2508 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2509 } 2510 // -Xint 2511 } else if (match_option(option, "-Xint", &tail)) { 2512 set_mode_flags(_int); 2513 // -Xmixed 2514 } else if (match_option(option, "-Xmixed", &tail)) { 2515 set_mode_flags(_mixed); 2516 // -Xcomp 2517 } else if (match_option(option, "-Xcomp", &tail)) { 2518 // for testing the compiler; turn off all flags that inhibit compilation 2519 set_mode_flags(_comp); 2520 2521 // -Xshare:dump 2522 } else if (match_option(option, "-Xshare:dump", &tail)) { 2523 #if !INCLUDE_CDS 2524 vm_exit_during_initialization( 2525 "Dumping a shared archive is not supported in this VM.", NULL); 2526 #else 2527 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2528 set_mode_flags(_int); // Prevent compilation, which creates objects 2529 #endif 2530 // -Xshare:on 2531 } else if (match_option(option, "-Xshare:on", &tail)) { 2532 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2533 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2534 // -Xshare:auto 2535 } else if (match_option(option, "-Xshare:auto", &tail)) { 2536 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2537 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2538 // -Xshare:off 2539 } else if (match_option(option, "-Xshare:off", &tail)) { 2540 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2541 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2542 2543 // -Xverify 2544 } else if (match_option(option, "-Xverify", &tail)) { 2545 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2546 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2547 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2548 } else if (strcmp(tail, ":remote") == 0) { 2549 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2550 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2551 } else if (strcmp(tail, ":none") == 0) { 2552 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2553 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2554 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2555 return JNI_EINVAL; 2556 } 2557 // -Xdebug 2558 } else if (match_option(option, "-Xdebug", &tail)) { 2559 // note this flag has been used, then ignore 2560 set_xdebug_mode(true); 2561 // -Xnoagent 2562 } else if (match_option(option, "-Xnoagent", &tail)) { 2563 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2564 } else if (match_option(option, "-Xboundthreads", &tail)) { 2565 // Bind user level threads to kernel threads (Solaris only) 2566 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2567 } else if (match_option(option, "-Xloggc:", &tail)) { 2568 // Redirect GC output to the file. -Xloggc:<filename> 2569 // ostream_init_log(), when called will use this filename 2570 // to initialize a fileStream. 2571 _gc_log_filename = strdup(tail); 2572 FLAG_SET_CMDLINE(bool, PrintGC, true); 2573 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2574 2575 // JNI hooks 2576 } else if (match_option(option, "-Xcheck", &tail)) { 2577 if (!strcmp(tail, ":jni")) { 2578 #if !INCLUDE_JNI_CHECK 2579 warning("JNI CHECKING is not supported in this VM"); 2580 #else 2581 CheckJNICalls = true; 2582 #endif // INCLUDE_JNI_CHECK 2583 } else if (is_bad_option(option, args->ignoreUnrecognized, 2584 "check")) { 2585 return JNI_EINVAL; 2586 } 2587 } else if (match_option(option, "vfprintf", &tail)) { 2588 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2589 } else if (match_option(option, "exit", &tail)) { 2590 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2591 } else if (match_option(option, "abort", &tail)) { 2592 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2593 // -XX:+AggressiveHeap 2594 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2595 2596 // This option inspects the machine and attempts to set various 2597 // parameters to be optimal for long-running, memory allocation 2598 // intensive jobs. It is intended for machines with large 2599 // amounts of cpu and memory. 2600 2601 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2602 // VM, but we may not be able to represent the total physical memory 2603 // available (like having 8gb of memory on a box but using a 32bit VM). 2604 // Thus, we need to make sure we're using a julong for intermediate 2605 // calculations. 2606 julong initHeapSize; 2607 julong total_memory = os::physical_memory(); 2608 2609 if (total_memory < (julong)256*M) { 2610 jio_fprintf(defaultStream::error_stream(), 2611 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2612 vm_exit(1); 2613 } 2614 2615 // The heap size is half of available memory, or (at most) 2616 // all of possible memory less 160mb (leaving room for the OS 2617 // when using ISM). This is the maximum; because adaptive sizing 2618 // is turned on below, the actual space used may be smaller. 2619 2620 initHeapSize = MIN2(total_memory / (julong)2, 2621 total_memory - (julong)160*M); 2622 2623 // Make sure that if we have a lot of memory we cap the 32 bit 2624 // process space. The 64bit VM version of this function is a nop. 2625 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2626 2627 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2628 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2629 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2630 // Currently the minimum size and the initial heap sizes are the same. 2631 set_min_heap_size(initHeapSize); 2632 } 2633 if (FLAG_IS_DEFAULT(NewSize)) { 2634 // Make the young generation 3/8ths of the total heap. 2635 FLAG_SET_CMDLINE(uintx, NewSize, 2636 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2637 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2638 } 2639 2640 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2641 FLAG_SET_DEFAULT(UseLargePages, true); 2642 #endif 2643 2644 // Increase some data structure sizes for efficiency 2645 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2646 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2647 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2648 2649 // See the OldPLABSize comment below, but replace 'after promotion' 2650 // with 'after copying'. YoungPLABSize is the size of the survivor 2651 // space per-gc-thread buffers. The default is 4kw. 2652 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2653 2654 // OldPLABSize is the size of the buffers in the old gen that 2655 // UseParallelGC uses to promote live data that doesn't fit in the 2656 // survivor spaces. At any given time, there's one for each gc thread. 2657 // The default size is 1kw. These buffers are rarely used, since the 2658 // survivor spaces are usually big enough. For specjbb, however, there 2659 // are occasions when there's lots of live data in the young gen 2660 // and we end up promoting some of it. We don't have a definite 2661 // explanation for why bumping OldPLABSize helps, but the theory 2662 // is that a bigger PLAB results in retaining something like the 2663 // original allocation order after promotion, which improves mutator 2664 // locality. A minor effect may be that larger PLABs reduce the 2665 // number of PLAB allocation events during gc. The value of 8kw 2666 // was arrived at by experimenting with specjbb. 2667 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2668 2669 // Enable parallel GC and adaptive generation sizing 2670 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2671 FLAG_SET_DEFAULT(ParallelGCThreads, 2672 Abstract_VM_Version::parallel_worker_threads()); 2673 2674 // Encourage steady state memory management 2675 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2676 2677 // This appears to improve mutator locality 2678 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2679 2680 // Get around early Solaris scheduling bug 2681 // (affinity vs other jobs on system) 2682 // but disallow DR and offlining (5008695). 2683 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2684 2685 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2686 // The last option must always win. 2687 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2688 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2689 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2690 // The last option must always win. 2691 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2692 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2693 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2694 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2695 jio_fprintf(defaultStream::error_stream(), 2696 "Please use CMSClassUnloadingEnabled in place of " 2697 "CMSPermGenSweepingEnabled in the future\n"); 2698 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2699 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2700 jio_fprintf(defaultStream::error_stream(), 2701 "Please use -XX:+UseGCOverheadLimit in place of " 2702 "-XX:+UseGCTimeLimit in the future\n"); 2703 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2704 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2705 jio_fprintf(defaultStream::error_stream(), 2706 "Please use -XX:-UseGCOverheadLimit in place of " 2707 "-XX:-UseGCTimeLimit in the future\n"); 2708 // The TLE options are for compatibility with 1.3 and will be 2709 // removed without notice in a future release. These options 2710 // are not to be documented. 2711 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2712 // No longer used. 2713 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2714 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2715 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2716 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2717 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2718 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2719 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2720 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2721 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2722 // No longer used. 2723 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2724 julong long_tlab_size = 0; 2725 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2726 if (errcode != arg_in_range) { 2727 jio_fprintf(defaultStream::error_stream(), 2728 "Invalid TLAB size: %s\n", option->optionString); 2729 describe_range_error(errcode); 2730 return JNI_EINVAL; 2731 } 2732 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2733 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2734 // No longer used. 2735 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2736 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2737 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2738 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2739 SOLARIS_ONLY( 2740 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2741 warning("-XX:+UsePermISM is obsolete."); 2742 FLAG_SET_CMDLINE(bool, UseISM, true); 2743 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2744 FLAG_SET_CMDLINE(bool, UseISM, false); 2745 ) 2746 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2747 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2748 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2749 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2750 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2751 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2752 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2753 #if defined(DTRACE_ENABLED) 2754 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2755 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2756 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2757 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2758 #else // defined(DTRACE_ENABLED) 2759 jio_fprintf(defaultStream::error_stream(), 2760 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2761 return JNI_EINVAL; 2762 #endif // defined(DTRACE_ENABLED) 2763 #ifdef ASSERT 2764 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2765 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2766 // disable scavenge before parallel mark-compact 2767 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2768 #endif 2769 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2770 julong cms_blocks_to_claim = (julong)atol(tail); 2771 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2772 jio_fprintf(defaultStream::error_stream(), 2773 "Please use -XX:OldPLABSize in place of " 2774 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2775 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2776 julong cms_blocks_to_claim = (julong)atol(tail); 2777 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2778 jio_fprintf(defaultStream::error_stream(), 2779 "Please use -XX:OldPLABSize in place of " 2780 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2781 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2782 julong old_plab_size = 0; 2783 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2784 if (errcode != arg_in_range) { 2785 jio_fprintf(defaultStream::error_stream(), 2786 "Invalid old PLAB size: %s\n", option->optionString); 2787 describe_range_error(errcode); 2788 return JNI_EINVAL; 2789 } 2790 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2791 jio_fprintf(defaultStream::error_stream(), 2792 "Please use -XX:OldPLABSize in place of " 2793 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2794 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2795 julong young_plab_size = 0; 2796 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2797 if (errcode != arg_in_range) { 2798 jio_fprintf(defaultStream::error_stream(), 2799 "Invalid young PLAB size: %s\n", option->optionString); 2800 describe_range_error(errcode); 2801 return JNI_EINVAL; 2802 } 2803 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2804 jio_fprintf(defaultStream::error_stream(), 2805 "Please use -XX:YoungPLABSize in place of " 2806 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2807 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2808 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2809 julong stack_size = 0; 2810 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2811 if (errcode != arg_in_range) { 2812 jio_fprintf(defaultStream::error_stream(), 2813 "Invalid mark stack size: %s\n", option->optionString); 2814 describe_range_error(errcode); 2815 return JNI_EINVAL; 2816 } 2817 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2818 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2819 julong max_stack_size = 0; 2820 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2821 if (errcode != arg_in_range) { 2822 jio_fprintf(defaultStream::error_stream(), 2823 "Invalid maximum mark stack size: %s\n", 2824 option->optionString); 2825 describe_range_error(errcode); 2826 return JNI_EINVAL; 2827 } 2828 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2829 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2830 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2831 uintx conc_threads = 0; 2832 if (!parse_uintx(tail, &conc_threads, 1)) { 2833 jio_fprintf(defaultStream::error_stream(), 2834 "Invalid concurrent threads: %s\n", option->optionString); 2835 return JNI_EINVAL; 2836 } 2837 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2838 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 2839 julong max_direct_memory_size = 0; 2840 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 2841 if (errcode != arg_in_range) { 2842 jio_fprintf(defaultStream::error_stream(), 2843 "Invalid maximum direct memory size: %s\n", 2844 option->optionString); 2845 describe_range_error(errcode); 2846 return JNI_EINVAL; 2847 } 2848 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 2849 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 2850 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 2851 // away and will cause VM initialization failures! 2852 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 2853 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 2854 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2855 // Skip -XX:Flags= since that case has already been handled 2856 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2857 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2858 return JNI_EINVAL; 2859 } 2860 } 2861 // Unknown option 2862 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2863 return JNI_ERR; 2864 } 2865 } 2866 2867 // Change the default value for flags which have different default values 2868 // when working with older JDKs. 2869 #ifdef LINUX 2870 if (JDK_Version::current().compare_major(6) <= 0 && 2871 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2872 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2873 } 2874 #endif // LINUX 2875 return JNI_OK; 2876 } 2877 2878 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2879 // This must be done after all -D arguments have been processed. 2880 scp_p->expand_endorsed(); 2881 2882 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2883 // Assemble the bootclasspath elements into the final path. 2884 Arguments::set_sysclasspath(scp_p->combined_path()); 2885 } 2886 2887 // This must be done after all arguments have been processed. 2888 // java_compiler() true means set to "NONE" or empty. 2889 if (java_compiler() && !xdebug_mode()) { 2890 // For backwards compatibility, we switch to interpreted mode if 2891 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2892 // not specified. 2893 set_mode_flags(_int); 2894 } 2895 if (CompileThreshold == 0) { 2896 set_mode_flags(_int); 2897 } 2898 2899 #ifndef COMPILER2 2900 // Don't degrade server performance for footprint 2901 if (FLAG_IS_DEFAULT(UseLargePages) && 2902 MaxHeapSize < LargePageHeapSizeThreshold) { 2903 // No need for large granularity pages w/small heaps. 2904 // Note that large pages are enabled/disabled for both the 2905 // Java heap and the code cache. 2906 FLAG_SET_DEFAULT(UseLargePages, false); 2907 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2908 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2909 } 2910 2911 // Tiered compilation is undefined with C1. 2912 TieredCompilation = false; 2913 #else 2914 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2915 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2916 } 2917 #endif 2918 2919 // If we are running in a headless jre, force java.awt.headless property 2920 // to be true unless the property has already been set. 2921 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2922 if (os::is_headless_jre()) { 2923 const char* headless = Arguments::get_property("java.awt.headless"); 2924 if (headless == NULL) { 2925 char envbuffer[128]; 2926 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2927 if (!add_property("java.awt.headless=true")) { 2928 return JNI_ENOMEM; 2929 } 2930 } else { 2931 char buffer[256]; 2932 strcpy(buffer, "java.awt.headless="); 2933 strcat(buffer, envbuffer); 2934 if (!add_property(buffer)) { 2935 return JNI_ENOMEM; 2936 } 2937 } 2938 } 2939 } 2940 2941 if (!check_vm_args_consistency()) { 2942 return JNI_ERR; 2943 } 2944 2945 return JNI_OK; 2946 } 2947 2948 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2949 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2950 scp_assembly_required_p); 2951 } 2952 2953 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2954 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2955 scp_assembly_required_p); 2956 } 2957 2958 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2959 const int N_MAX_OPTIONS = 64; 2960 const int OPTION_BUFFER_SIZE = 1024; 2961 char buffer[OPTION_BUFFER_SIZE]; 2962 2963 // The variable will be ignored if it exceeds the length of the buffer. 2964 // Don't check this variable if user has special privileges 2965 // (e.g. unix su command). 2966 if (os::getenv(name, buffer, sizeof(buffer)) && 2967 !os::have_special_privileges()) { 2968 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2969 jio_fprintf(defaultStream::error_stream(), 2970 "Picked up %s: %s\n", name, buffer); 2971 char* rd = buffer; // pointer to the input string (rd) 2972 int i; 2973 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2974 while (isspace(*rd)) rd++; // skip whitespace 2975 if (*rd == 0) break; // we re done when the input string is read completely 2976 2977 // The output, option string, overwrites the input string. 2978 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2979 // input string (rd). 2980 char* wrt = rd; 2981 2982 options[i++].optionString = wrt; // Fill in option 2983 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2984 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2985 int quote = *rd; // matching quote to look for 2986 rd++; // don't copy open quote 2987 while (*rd != quote) { // include everything (even spaces) up until quote 2988 if (*rd == 0) { // string termination means unmatched string 2989 jio_fprintf(defaultStream::error_stream(), 2990 "Unmatched quote in %s\n", name); 2991 return JNI_ERR; 2992 } 2993 *wrt++ = *rd++; // copy to option string 2994 } 2995 rd++; // don't copy close quote 2996 } else { 2997 *wrt++ = *rd++; // copy to option string 2998 } 2999 } 3000 // Need to check if we're done before writing a NULL, 3001 // because the write could be to the byte that rd is pointing to. 3002 if (*rd++ == 0) { 3003 *wrt = 0; 3004 break; 3005 } 3006 *wrt = 0; // Zero terminate option 3007 } 3008 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3009 JavaVMInitArgs vm_args; 3010 vm_args.version = JNI_VERSION_1_2; 3011 vm_args.options = options; 3012 vm_args.nOptions = i; 3013 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3014 3015 if (PrintVMOptions) { 3016 const char* tail; 3017 for (int i = 0; i < vm_args.nOptions; i++) { 3018 const JavaVMOption *option = vm_args.options + i; 3019 if (match_option(option, "-XX:", &tail)) { 3020 logOption(tail); 3021 } 3022 } 3023 } 3024 3025 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3026 } 3027 return JNI_OK; 3028 } 3029 3030 void Arguments::set_shared_spaces_flags() { 3031 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 3032 const bool might_share = must_share || UseSharedSpaces; 3033 3034 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 3035 // static fields are incorrect in the archive. With some more clever 3036 // initialization, this restriction can probably be lifted. 3037 // ??? UseLargePages might be okay now 3038 const bool cannot_share = UseCompressedOops || 3039 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages)); 3040 if (cannot_share) { 3041 if (must_share) { 3042 warning("disabling large pages %s" 3043 "because of %s", "" LP64_ONLY("and compressed oops "), 3044 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 3045 FLAG_SET_CMDLINE(bool, UseLargePages, false); 3046 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 3047 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false)); 3048 } else { 3049 // Prefer compressed oops and large pages to class data sharing 3050 if (UseSharedSpaces && Verbose) { 3051 warning("turning off use of shared archive because of large pages%s", 3052 "" LP64_ONLY(" and/or compressed oops")); 3053 } 3054 no_shared_spaces(); 3055 } 3056 } else if (UseLargePages && might_share) { 3057 // Disable large pages to allow shared spaces. This is sub-optimal, since 3058 // there may not even be a shared archive to use. 3059 FLAG_SET_DEFAULT(UseLargePages, false); 3060 } 3061 3062 if (DumpSharedSpaces) { 3063 if (RequireSharedSpaces) { 3064 warning("cannot dump shared archive while using shared archive"); 3065 } 3066 UseSharedSpaces = false; 3067 } 3068 } 3069 3070 // Disable options not supported in this release, with a warning if they 3071 // were explicitly requested on the command-line 3072 #define UNSUPPORTED_OPTION(opt, description) \ 3073 do { \ 3074 if (opt) { \ 3075 if (FLAG_IS_CMDLINE(opt)) { \ 3076 warning(description " is disabled in this release."); \ 3077 } \ 3078 FLAG_SET_DEFAULT(opt, false); \ 3079 } \ 3080 } while(0) 3081 3082 // Parse entry point called from JNI_CreateJavaVM 3083 3084 jint Arguments::parse(const JavaVMInitArgs* args) { 3085 3086 // Sharing support 3087 // Construct the path to the archive 3088 char jvm_path[JVM_MAXPATHLEN]; 3089 os::jvm_path(jvm_path, sizeof(jvm_path)); 3090 char *end = strrchr(jvm_path, *os::file_separator()); 3091 if (end != NULL) *end = '\0'; 3092 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 3093 strlen(os::file_separator()) + 20, mtInternal); 3094 if (shared_archive_path == NULL) return JNI_ENOMEM; 3095 strcpy(shared_archive_path, jvm_path); 3096 strcat(shared_archive_path, os::file_separator()); 3097 strcat(shared_archive_path, "classes"); 3098 strcat(shared_archive_path, ".jsa"); 3099 SharedArchivePath = shared_archive_path; 3100 3101 // Remaining part of option string 3102 const char* tail; 3103 3104 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3105 const char* hotspotrc = ".hotspotrc"; 3106 bool settings_file_specified = false; 3107 bool needs_hotspotrc_warning = false; 3108 3109 const char* flags_file; 3110 int index; 3111 for (index = 0; index < args->nOptions; index++) { 3112 const JavaVMOption *option = args->options + index; 3113 if (match_option(option, "-XX:Flags=", &tail)) { 3114 flags_file = tail; 3115 settings_file_specified = true; 3116 } 3117 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3118 PrintVMOptions = true; 3119 } 3120 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3121 PrintVMOptions = false; 3122 } 3123 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3124 IgnoreUnrecognizedVMOptions = true; 3125 } 3126 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3127 IgnoreUnrecognizedVMOptions = false; 3128 } 3129 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3130 CommandLineFlags::printFlags(tty, false); 3131 vm_exit(0); 3132 } 3133 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3134 #if INCLUDE_NMT 3135 MemTracker::init_tracking_options(tail); 3136 #else 3137 warning("Native Memory Tracking is not supported in this VM"); 3138 #endif 3139 } 3140 3141 3142 #ifndef PRODUCT 3143 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3144 CommandLineFlags::printFlags(tty, true); 3145 vm_exit(0); 3146 } 3147 #endif 3148 } 3149 3150 if (IgnoreUnrecognizedVMOptions) { 3151 // uncast const to modify the flag args->ignoreUnrecognized 3152 *(jboolean*)(&args->ignoreUnrecognized) = true; 3153 } 3154 3155 // Parse specified settings file 3156 if (settings_file_specified) { 3157 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3158 return JNI_EINVAL; 3159 } 3160 } else { 3161 #ifdef ASSERT 3162 // Parse default .hotspotrc settings file 3163 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3164 return JNI_EINVAL; 3165 } 3166 #else 3167 struct stat buf; 3168 if (os::stat(hotspotrc, &buf) == 0) { 3169 needs_hotspotrc_warning = true; 3170 } 3171 #endif 3172 } 3173 3174 if (PrintVMOptions) { 3175 for (index = 0; index < args->nOptions; index++) { 3176 const JavaVMOption *option = args->options + index; 3177 if (match_option(option, "-XX:", &tail)) { 3178 logOption(tail); 3179 } 3180 } 3181 } 3182 3183 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3184 jint result = parse_vm_init_args(args); 3185 if (result != JNI_OK) { 3186 return result; 3187 } 3188 3189 // Delay warning until here so that we've had a chance to process 3190 // the -XX:-PrintWarnings flag 3191 if (needs_hotspotrc_warning) { 3192 warning("%s file is present but has been ignored. " 3193 "Run with -XX:Flags=%s to load the file.", 3194 hotspotrc, hotspotrc); 3195 } 3196 3197 #if (defined JAVASE_EMBEDDED || defined ARM) 3198 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3199 #endif 3200 3201 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3202 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3203 #endif 3204 3205 #if !INCLUDE_ALL_GCS 3206 if (UseParallelGC) { 3207 warning("Parallel GC is not supported in this VM. Using Serial GC."); 3208 } 3209 if (UseParallelOldGC) { 3210 warning("Parallel Old GC is not supported in this VM. Using Serial GC."); 3211 } 3212 if (UseConcMarkSweepGC) { 3213 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC."); 3214 } 3215 if (UseParNewGC) { 3216 warning("Par New GC is not supported in this VM. Using Serial GC."); 3217 } 3218 #endif // INCLUDE_ALL_GCS 3219 3220 #ifndef PRODUCT 3221 if (TraceBytecodesAt != 0) { 3222 TraceBytecodes = true; 3223 } 3224 if (CountCompiledCalls) { 3225 if (UseCounterDecay) { 3226 warning("UseCounterDecay disabled because CountCalls is set"); 3227 UseCounterDecay = false; 3228 } 3229 } 3230 #endif // PRODUCT 3231 3232 // JSR 292 is not supported before 1.7 3233 if (!JDK_Version::is_gte_jdk17x_version()) { 3234 if (EnableInvokeDynamic) { 3235 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3236 warning("JSR 292 is not supported before 1.7. Disabling support."); 3237 } 3238 EnableInvokeDynamic = false; 3239 } 3240 } 3241 3242 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3243 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3244 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3245 } 3246 ScavengeRootsInCode = 1; 3247 } 3248 3249 if (PrintGCDetails) { 3250 // Turn on -verbose:gc options as well 3251 PrintGC = true; 3252 } 3253 3254 if (!JDK_Version::is_gte_jdk18x_version()) { 3255 // To avoid changing the log format for 7 updates this flag is only 3256 // true by default in JDK8 and above. 3257 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3258 FLAG_SET_DEFAULT(PrintGCCause, false); 3259 } 3260 } 3261 3262 // Set object alignment values. 3263 set_object_alignment(); 3264 3265 #if !INCLUDE_ALL_GCS 3266 force_serial_gc(); 3267 #endif // INCLUDE_ALL_GCS 3268 #if !INCLUDE_CDS 3269 no_shared_spaces(); 3270 #endif // INCLUDE_CDS 3271 3272 // Set flags based on ergonomics. 3273 set_ergonomics_flags(); 3274 3275 set_shared_spaces_flags(); 3276 3277 // Check the GC selections again. 3278 if (!check_gc_consistency()) { 3279 return JNI_EINVAL; 3280 } 3281 3282 if (TieredCompilation) { 3283 set_tiered_flags(); 3284 } else { 3285 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3286 if (CompilationPolicyChoice >= 2) { 3287 vm_exit_during_initialization( 3288 "Incompatible compilation policy selected", NULL); 3289 } 3290 } 3291 3292 // Set heap size based on available physical memory 3293 set_heap_size(); 3294 3295 #if INCLUDE_ALL_GCS 3296 // Set per-collector flags 3297 if (UseParallelGC || UseParallelOldGC) { 3298 set_parallel_gc_flags(); 3299 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3300 set_cms_and_parnew_gc_flags(); 3301 } else if (UseParNewGC) { // skipped if CMS is set above 3302 set_parnew_gc_flags(); 3303 } else if (UseG1GC) { 3304 set_g1_gc_flags(); 3305 } 3306 check_gc_flags(); 3307 check_deprecated_gcs(); 3308 #else // INCLUDE_ALL_GCS 3309 assert(verify_serial_gc_flags(), "SerialGC unset"); 3310 #endif // INCLUDE_ALL_GCS 3311 3312 // Set bytecode rewriting flags 3313 set_bytecode_flags(); 3314 3315 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3316 set_aggressive_opts_flags(); 3317 3318 // Turn off biased locking for locking debug mode flags, 3319 // which are subtlely different from each other but neither works with 3320 // biased locking. 3321 if (UseHeavyMonitors 3322 #ifdef COMPILER1 3323 || !UseFastLocking 3324 #endif // COMPILER1 3325 ) { 3326 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3327 // flag set to true on command line; warn the user that they 3328 // can't enable biased locking here 3329 warning("Biased Locking is not supported with locking debug flags" 3330 "; ignoring UseBiasedLocking flag." ); 3331 } 3332 UseBiasedLocking = false; 3333 } 3334 3335 #ifdef CC_INTERP 3336 // Clear flags not supported by the C++ interpreter 3337 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3338 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3339 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3340 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3341 #endif // CC_INTERP 3342 3343 #ifdef COMPILER2 3344 if (!UseBiasedLocking || EmitSync != 0) { 3345 UseOptoBiasInlining = false; 3346 } 3347 if (!EliminateLocks) { 3348 EliminateNestedLocks = false; 3349 } 3350 if (!Inline) { 3351 IncrementalInline = false; 3352 } 3353 #ifndef PRODUCT 3354 if (!IncrementalInline) { 3355 AlwaysIncrementalInline = false; 3356 } 3357 #endif 3358 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3359 // incremental inlining: bump MaxNodeLimit 3360 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3361 } 3362 #endif 3363 3364 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3365 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3366 DebugNonSafepoints = true; 3367 } 3368 3369 #ifndef PRODUCT 3370 if (CompileTheWorld) { 3371 // Force NmethodSweeper to sweep whole CodeCache each time. 3372 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3373 NmethodSweepFraction = 1; 3374 } 3375 } 3376 #endif 3377 3378 if (PrintCommandLineFlags) { 3379 CommandLineFlags::printSetFlags(tty); 3380 } 3381 3382 // Apply CPU specific policy for the BiasedLocking 3383 if (UseBiasedLocking) { 3384 if (!VM_Version::use_biased_locking() && 3385 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3386 UseBiasedLocking = false; 3387 } 3388 } 3389 3390 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3391 // but only if not already set on the commandline 3392 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3393 bool set = false; 3394 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3395 if (!set) { 3396 FLAG_SET_DEFAULT(PauseAtExit, true); 3397 } 3398 } 3399 3400 return JNI_OK; 3401 } 3402 3403 jint Arguments::adjust_after_os() { 3404 #if INCLUDE_ALL_GCS 3405 if (UseParallelGC || UseParallelOldGC) { 3406 if (UseNUMA) { 3407 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3408 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3409 } 3410 // For those collectors or operating systems (eg, Windows) that do 3411 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3412 UseNUMAInterleaving = true; 3413 } 3414 } 3415 #endif // INCLUDE_ALL_GCS 3416 return JNI_OK; 3417 } 3418 3419 int Arguments::PropertyList_count(SystemProperty* pl) { 3420 int count = 0; 3421 while(pl != NULL) { 3422 count++; 3423 pl = pl->next(); 3424 } 3425 return count; 3426 } 3427 3428 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3429 assert(key != NULL, "just checking"); 3430 SystemProperty* prop; 3431 for (prop = pl; prop != NULL; prop = prop->next()) { 3432 if (strcmp(key, prop->key()) == 0) return prop->value(); 3433 } 3434 return NULL; 3435 } 3436 3437 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3438 int count = 0; 3439 const char* ret_val = NULL; 3440 3441 while(pl != NULL) { 3442 if(count >= index) { 3443 ret_val = pl->key(); 3444 break; 3445 } 3446 count++; 3447 pl = pl->next(); 3448 } 3449 3450 return ret_val; 3451 } 3452 3453 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3454 int count = 0; 3455 char* ret_val = NULL; 3456 3457 while(pl != NULL) { 3458 if(count >= index) { 3459 ret_val = pl->value(); 3460 break; 3461 } 3462 count++; 3463 pl = pl->next(); 3464 } 3465 3466 return ret_val; 3467 } 3468 3469 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3470 SystemProperty* p = *plist; 3471 if (p == NULL) { 3472 *plist = new_p; 3473 } else { 3474 while (p->next() != NULL) { 3475 p = p->next(); 3476 } 3477 p->set_next(new_p); 3478 } 3479 } 3480 3481 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3482 if (plist == NULL) 3483 return; 3484 3485 SystemProperty* new_p = new SystemProperty(k, v, true); 3486 PropertyList_add(plist, new_p); 3487 } 3488 3489 // This add maintains unique property key in the list. 3490 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3491 if (plist == NULL) 3492 return; 3493 3494 // If property key exist then update with new value. 3495 SystemProperty* prop; 3496 for (prop = *plist; prop != NULL; prop = prop->next()) { 3497 if (strcmp(k, prop->key()) == 0) { 3498 if (append) { 3499 prop->append_value(v); 3500 } else { 3501 prop->set_value(v); 3502 } 3503 return; 3504 } 3505 } 3506 3507 PropertyList_add(plist, k, v); 3508 } 3509 3510 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3511 // Returns true if all of the source pointed by src has been copied over to 3512 // the destination buffer pointed by buf. Otherwise, returns false. 3513 // Notes: 3514 // 1. If the length (buflen) of the destination buffer excluding the 3515 // NULL terminator character is not long enough for holding the expanded 3516 // pid characters, it also returns false instead of returning the partially 3517 // expanded one. 3518 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3519 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3520 char* buf, size_t buflen) { 3521 const char* p = src; 3522 char* b = buf; 3523 const char* src_end = &src[srclen]; 3524 char* buf_end = &buf[buflen - 1]; 3525 3526 while (p < src_end && b < buf_end) { 3527 if (*p == '%') { 3528 switch (*(++p)) { 3529 case '%': // "%%" ==> "%" 3530 *b++ = *p++; 3531 break; 3532 case 'p': { // "%p" ==> current process id 3533 // buf_end points to the character before the last character so 3534 // that we could write '\0' to the end of the buffer. 3535 size_t buf_sz = buf_end - b + 1; 3536 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3537 3538 // if jio_snprintf fails or the buffer is not long enough to hold 3539 // the expanded pid, returns false. 3540 if (ret < 0 || ret >= (int)buf_sz) { 3541 return false; 3542 } else { 3543 b += ret; 3544 assert(*b == '\0', "fail in copy_expand_pid"); 3545 if (p == src_end && b == buf_end + 1) { 3546 // reach the end of the buffer. 3547 return true; 3548 } 3549 } 3550 p++; 3551 break; 3552 } 3553 default : 3554 *b++ = '%'; 3555 } 3556 } else { 3557 *b++ = *p++; 3558 } 3559 } 3560 *b = '\0'; 3561 return (p == src_end); // return false if not all of the source was copied 3562 }