1 /* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "compiler/compilerOracle.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/cardTableRS.hpp" 31 #include "memory/referenceProcessor.hpp" 32 #include "memory/universe.inline.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "prims/jvmtiExport.hpp" 35 #include "runtime/arguments.hpp" 36 #include "runtime/globals_extension.hpp" 37 #include "runtime/java.hpp" 38 #include "services/management.hpp" 39 #include "services/memTracker.hpp" 40 #include "utilities/defaultStream.hpp" 41 #include "utilities/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, os::julong_format_specifier(), &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 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg; 832 if (is_newly_obsolete(arg, &since)) { 833 char version[256]; 834 since.to_string(version, sizeof(version)); 835 warning("ignoring option %s; support was removed in %s", argname, version); 836 return true; 837 } 838 839 // For locked flags, report a custom error message if available. 840 // Otherwise, report the standard unrecognized VM option. 841 842 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true); 843 if (locked_flag != NULL) { 844 char locked_message_buf[BUFLEN]; 845 locked_flag->get_locked_message(locked_message_buf, BUFLEN); 846 if (strlen(locked_message_buf) == 0) { 847 jio_fprintf(defaultStream::error_stream(), 848 "Unrecognized VM option '%s'\n", argname); 849 } else { 850 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 851 } 852 } else { 853 jio_fprintf(defaultStream::error_stream(), 854 "Unrecognized VM option '%s'\n", argname); 855 } 856 857 // allow for commandline "commenting out" options like -XX:#+Verbose 858 return arg[0] == '#'; 859 } 860 861 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 862 FILE* stream = fopen(file_name, "rb"); 863 if (stream == NULL) { 864 if (should_exist) { 865 jio_fprintf(defaultStream::error_stream(), 866 "Could not open settings file %s\n", file_name); 867 return false; 868 } else { 869 return true; 870 } 871 } 872 873 char token[1024]; 874 int pos = 0; 875 876 bool in_white_space = true; 877 bool in_comment = false; 878 bool in_quote = false; 879 char quote_c = 0; 880 bool result = true; 881 882 int c = getc(stream); 883 while(c != EOF && pos < (int)(sizeof(token)-1)) { 884 if (in_white_space) { 885 if (in_comment) { 886 if (c == '\n') in_comment = false; 887 } else { 888 if (c == '#') in_comment = true; 889 else if (!isspace(c)) { 890 in_white_space = false; 891 token[pos++] = c; 892 } 893 } 894 } else { 895 if (c == '\n' || (!in_quote && isspace(c))) { 896 // token ends at newline, or at unquoted whitespace 897 // this allows a way to include spaces in string-valued options 898 token[pos] = '\0'; 899 logOption(token); 900 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 901 build_jvm_flags(token); 902 pos = 0; 903 in_white_space = true; 904 in_quote = false; 905 } else if (!in_quote && (c == '\'' || c == '"')) { 906 in_quote = true; 907 quote_c = c; 908 } else if (in_quote && (c == quote_c)) { 909 in_quote = false; 910 } else { 911 token[pos++] = c; 912 } 913 } 914 c = getc(stream); 915 } 916 if (pos > 0) { 917 token[pos] = '\0'; 918 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 919 build_jvm_flags(token); 920 } 921 fclose(stream); 922 return result; 923 } 924 925 //============================================================================================================= 926 // Parsing of properties (-D) 927 928 const char* Arguments::get_property(const char* key) { 929 return PropertyList_get_value(system_properties(), key); 930 } 931 932 bool Arguments::add_property(const char* prop) { 933 const char* eq = strchr(prop, '='); 934 char* key; 935 // ns must be static--its address may be stored in a SystemProperty object. 936 const static char ns[1] = {0}; 937 char* value = (char *)ns; 938 939 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 940 key = AllocateHeap(key_len + 1, mtInternal); 941 strncpy(key, prop, key_len); 942 key[key_len] = '\0'; 943 944 if (eq != NULL) { 945 size_t value_len = strlen(prop) - key_len - 1; 946 value = AllocateHeap(value_len + 1, mtInternal); 947 strncpy(value, &prop[key_len + 1], value_len + 1); 948 } 949 950 if (strcmp(key, "java.compiler") == 0) { 951 process_java_compiler_argument(value); 952 FreeHeap(key); 953 if (eq != NULL) { 954 FreeHeap(value); 955 } 956 return true; 957 } else if (strcmp(key, "sun.java.command") == 0) { 958 _java_command = value; 959 960 // Record value in Arguments, but let it get passed to Java. 961 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 962 // launcher.pid property is private and is processed 963 // in process_sun_java_launcher_properties(); 964 // the sun.java.launcher property is passed on to the java application 965 FreeHeap(key); 966 if (eq != NULL) { 967 FreeHeap(value); 968 } 969 return true; 970 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 971 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 972 // its value without going through the property list or making a Java call. 973 _java_vendor_url_bug = value; 974 } else if (strcmp(key, "sun.boot.library.path") == 0) { 975 PropertyList_unique_add(&_system_properties, key, value, true); 976 return true; 977 } 978 // Create new property and add at the end of the list 979 PropertyList_unique_add(&_system_properties, key, value); 980 return true; 981 } 982 983 //=========================================================================================================== 984 // Setting int/mixed/comp mode flags 985 986 void Arguments::set_mode_flags(Mode mode) { 987 // Set up default values for all flags. 988 // If you add a flag to any of the branches below, 989 // add a default value for it here. 990 set_java_compiler(false); 991 _mode = mode; 992 993 // Ensure Agent_OnLoad has the correct initial values. 994 // This may not be the final mode; mode may change later in onload phase. 995 PropertyList_unique_add(&_system_properties, "java.vm.info", 996 (char*)VM_Version::vm_info_string(), false); 997 998 UseInterpreter = true; 999 UseCompiler = true; 1000 UseLoopCounter = true; 1001 1002 #ifndef ZERO 1003 // Turn these off for mixed and comp. Leave them on for Zero. 1004 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1005 UseFastAccessorMethods = (mode == _int); 1006 } 1007 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1008 UseFastEmptyMethods = (mode == _int); 1009 } 1010 #endif 1011 1012 // Default values may be platform/compiler dependent - 1013 // use the saved values 1014 ClipInlining = Arguments::_ClipInlining; 1015 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1016 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1017 BackgroundCompilation = Arguments::_BackgroundCompilation; 1018 1019 // Change from defaults based on mode 1020 switch (mode) { 1021 default: 1022 ShouldNotReachHere(); 1023 break; 1024 case _int: 1025 UseCompiler = false; 1026 UseLoopCounter = false; 1027 AlwaysCompileLoopMethods = false; 1028 UseOnStackReplacement = false; 1029 break; 1030 case _mixed: 1031 // same as default 1032 break; 1033 case _comp: 1034 UseInterpreter = false; 1035 BackgroundCompilation = false; 1036 ClipInlining = false; 1037 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1038 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1039 // compile a level 4 (C2) and then continue executing it. 1040 if (TieredCompilation) { 1041 Tier3InvokeNotifyFreqLog = 0; 1042 Tier4InvocationThreshold = 0; 1043 } 1044 break; 1045 } 1046 } 1047 1048 // Conflict: required to use shared spaces (-Xshare:on), but 1049 // incompatible command line options were chosen. 1050 1051 static void no_shared_spaces() { 1052 if (RequireSharedSpaces) { 1053 jio_fprintf(defaultStream::error_stream(), 1054 "Class data sharing is inconsistent with other specified options.\n"); 1055 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1056 } else { 1057 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1058 } 1059 } 1060 1061 void Arguments::set_tiered_flags() { 1062 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1063 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1064 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1065 } 1066 if (CompilationPolicyChoice < 2) { 1067 vm_exit_during_initialization( 1068 "Incompatible compilation policy selected", NULL); 1069 } 1070 // Increase the code cache size - tiered compiles a lot more. 1071 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1072 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1073 } 1074 } 1075 1076 #if INCLUDE_ALL_GCS 1077 static void disable_adaptive_size_policy(const char* collector_name) { 1078 if (UseAdaptiveSizePolicy) { 1079 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1080 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1081 collector_name); 1082 } 1083 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1084 } 1085 } 1086 1087 void Arguments::set_parnew_gc_flags() { 1088 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1089 "control point invariant"); 1090 assert(UseParNewGC, "Error"); 1091 1092 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1093 disable_adaptive_size_policy("UseParNewGC"); 1094 1095 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1096 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1097 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1098 } else if (ParallelGCThreads == 0) { 1099 jio_fprintf(defaultStream::error_stream(), 1100 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1101 vm_exit(1); 1102 } 1103 1104 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1105 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1106 // we set them to 1024 and 1024. 1107 // See CR 6362902. 1108 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1109 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1110 } 1111 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1112 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1113 } 1114 1115 // AlwaysTenure flag should make ParNew promote all at first collection. 1116 // See CR 6362902. 1117 if (AlwaysTenure) { 1118 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1119 } 1120 // When using compressed oops, we use local overflow stacks, 1121 // rather than using a global overflow list chained through 1122 // the klass word of the object's pre-image. 1123 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1124 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1125 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1126 } 1127 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1128 } 1129 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1130 } 1131 1132 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1133 // sparc/solaris for certain applications, but would gain from 1134 // further optimization and tuning efforts, and would almost 1135 // certainly gain from analysis of platform and environment. 1136 void Arguments::set_cms_and_parnew_gc_flags() { 1137 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1138 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1139 1140 // If we are using CMS, we prefer to UseParNewGC, 1141 // unless explicitly forbidden. 1142 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1143 FLAG_SET_ERGO(bool, UseParNewGC, true); 1144 } 1145 1146 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1147 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1148 1149 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1150 // as needed. 1151 if (UseParNewGC) { 1152 set_parnew_gc_flags(); 1153 } 1154 1155 // MaxHeapSize is aligned down in collectorPolicy 1156 size_t max_heap = align_size_down(MaxHeapSize, 1157 CardTableRS::ct_max_alignment_constraint()); 1158 1159 // Now make adjustments for CMS 1160 intx tenuring_default = (intx)6; 1161 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1162 1163 // Preferred young gen size for "short" pauses: 1164 // upper bound depends on # of threads and NewRatio. 1165 const uintx parallel_gc_threads = 1166 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1167 const size_t preferred_max_new_size_unaligned = 1168 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1169 size_t preferred_max_new_size = 1170 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1171 1172 // Unless explicitly requested otherwise, size young gen 1173 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1174 1175 // If either MaxNewSize or NewRatio is set on the command line, 1176 // assume the user is trying to set the size of the young gen. 1177 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1178 1179 // Set MaxNewSize to our calculated preferred_max_new_size unless 1180 // NewSize was set on the command line and it is larger than 1181 // preferred_max_new_size. 1182 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1183 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1184 } else { 1185 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1186 } 1187 if (PrintGCDetails && Verbose) { 1188 // Too early to use gclog_or_tty 1189 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1190 } 1191 1192 // Code along this path potentially sets NewSize and OldSize 1193 1194 assert(max_heap >= InitialHeapSize, "Error"); 1195 assert(max_heap >= NewSize, "Error"); 1196 1197 if (PrintGCDetails && Verbose) { 1198 // Too early to use gclog_or_tty 1199 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1200 " initial_heap_size: " SIZE_FORMAT 1201 " max_heap: " SIZE_FORMAT, 1202 min_heap_size(), InitialHeapSize, max_heap); 1203 } 1204 size_t min_new = preferred_max_new_size; 1205 if (FLAG_IS_CMDLINE(NewSize)) { 1206 min_new = NewSize; 1207 } 1208 if (max_heap > min_new && min_heap_size() > min_new) { 1209 // Unless explicitly requested otherwise, make young gen 1210 // at least min_new, and at most preferred_max_new_size. 1211 if (FLAG_IS_DEFAULT(NewSize)) { 1212 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1213 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1214 if (PrintGCDetails && Verbose) { 1215 // Too early to use gclog_or_tty 1216 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1217 } 1218 } 1219 // Unless explicitly requested otherwise, size old gen 1220 // so it's NewRatio x of NewSize. 1221 if (FLAG_IS_DEFAULT(OldSize)) { 1222 if (max_heap > NewSize) { 1223 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1224 if (PrintGCDetails && Verbose) { 1225 // Too early to use gclog_or_tty 1226 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1227 } 1228 } 1229 } 1230 } 1231 } 1232 // Unless explicitly requested otherwise, definitely 1233 // promote all objects surviving "tenuring_default" scavenges. 1234 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1235 FLAG_IS_DEFAULT(SurvivorRatio)) { 1236 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1237 } 1238 // If we decided above (or user explicitly requested) 1239 // `promote all' (via MaxTenuringThreshold := 0), 1240 // prefer minuscule survivor spaces so as not to waste 1241 // space for (non-existent) survivors 1242 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1243 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1244 } 1245 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1246 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1247 // This is done in order to make ParNew+CMS configuration to work 1248 // with YoungPLABSize and OldPLABSize options. 1249 // See CR 6362902. 1250 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1251 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1252 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1253 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1254 // the value (either from the command line or ergonomics) of 1255 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1256 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1257 } else { 1258 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1259 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1260 // we'll let it to take precedence. 1261 jio_fprintf(defaultStream::error_stream(), 1262 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1263 " options are specified for the CMS collector." 1264 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1265 } 1266 } 1267 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1268 // OldPLAB sizing manually turned off: Use a larger default setting, 1269 // unless it was manually specified. This is because a too-low value 1270 // will slow down scavenges. 1271 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1272 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1273 } 1274 } 1275 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1276 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1277 // If either of the static initialization defaults have changed, note this 1278 // modification. 1279 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1280 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1281 } 1282 if (PrintGCDetails && Verbose) { 1283 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1284 MarkStackSize / K, MarkStackSizeMax / K); 1285 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1286 } 1287 } 1288 #endif // INCLUDE_ALL_GCS 1289 1290 void set_object_alignment() { 1291 // Object alignment. 1292 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1293 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1294 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1295 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1296 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1297 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1298 1299 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1300 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1301 1302 // Oop encoding heap max 1303 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1304 1305 #if INCLUDE_ALL_GCS 1306 // Set CMS global values 1307 CompactibleFreeListSpace::set_cms_values(); 1308 #endif // INCLUDE_ALL_GCS 1309 } 1310 1311 bool verify_object_alignment() { 1312 // Object alignment. 1313 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1314 jio_fprintf(defaultStream::error_stream(), 1315 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1316 (int)ObjectAlignmentInBytes); 1317 return false; 1318 } 1319 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1320 jio_fprintf(defaultStream::error_stream(), 1321 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1322 (int)ObjectAlignmentInBytes, BytesPerLong); 1323 return false; 1324 } 1325 // It does not make sense to have big object alignment 1326 // since a space lost due to alignment will be greater 1327 // then a saved space from compressed oops. 1328 if ((int)ObjectAlignmentInBytes > 256) { 1329 jio_fprintf(defaultStream::error_stream(), 1330 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1331 (int)ObjectAlignmentInBytes); 1332 return false; 1333 } 1334 // In case page size is very small. 1335 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1336 jio_fprintf(defaultStream::error_stream(), 1337 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1338 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1339 return false; 1340 } 1341 return true; 1342 } 1343 1344 inline uintx max_heap_for_compressed_oops() { 1345 // Avoid sign flip. 1346 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) { 1347 return 0; 1348 } 1349 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size()); 1350 NOT_LP64(ShouldNotReachHere(); return 0); 1351 } 1352 1353 bool Arguments::should_auto_select_low_pause_collector() { 1354 if (UseAutoGCSelectPolicy && 1355 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1356 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1357 if (PrintGCDetails) { 1358 // Cannot use gclog_or_tty yet. 1359 tty->print_cr("Automatic selection of the low pause collector" 1360 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1361 } 1362 return true; 1363 } 1364 return false; 1365 } 1366 1367 void Arguments::set_ergonomics_flags() { 1368 1369 if (os::is_server_class_machine()) { 1370 // If no other collector is requested explicitly, 1371 // let the VM select the collector based on 1372 // machine class and automatic selection policy. 1373 if (!UseSerialGC && 1374 !UseConcMarkSweepGC && 1375 !UseG1GC && 1376 !UseParNewGC && 1377 FLAG_IS_DEFAULT(UseParallelGC)) { 1378 if (should_auto_select_low_pause_collector()) { 1379 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1380 } else { 1381 FLAG_SET_ERGO(bool, UseParallelGC, true); 1382 } 1383 } 1384 // Shared spaces work fine with other GCs but causes bytecode rewriting 1385 // to be disabled, which hurts interpreter performance and decreases 1386 // server performance. On server class machines, keep the default 1387 // off unless it is asked for. Future work: either add bytecode rewriting 1388 // at link time, or rewrite bytecodes in non-shared methods. 1389 if (!DumpSharedSpaces && !RequireSharedSpaces) { 1390 no_shared_spaces(); 1391 } 1392 } 1393 1394 #ifndef ZERO 1395 #ifdef _LP64 1396 // Check that UseCompressedOops can be set with the max heap size allocated 1397 // by ergonomics. 1398 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1399 #if !defined(COMPILER1) || defined(TIERED) 1400 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1401 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1402 } 1403 #endif 1404 #ifdef _WIN64 1405 if (UseLargePages && UseCompressedOops) { 1406 // Cannot allocate guard pages for implicit checks in indexed addressing 1407 // mode, when large pages are specified on windows. 1408 // This flag could be switched ON if narrow oop base address is set to 0, 1409 // see code in Universe::initialize_heap(). 1410 Universe::set_narrow_oop_use_implicit_null_checks(false); 1411 } 1412 #endif // _WIN64 1413 } else { 1414 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1415 warning("Max heap size too large for Compressed Oops"); 1416 FLAG_SET_DEFAULT(UseCompressedOops, false); 1417 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1418 } 1419 } 1420 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1421 if (!UseCompressedOops) { 1422 if (UseCompressedKlassPointers) { 1423 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1424 } 1425 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1426 } else { 1427 // Turn on UseCompressedKlassPointers too 1428 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1429 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1430 } 1431 // Set the ClassMetaspaceSize to something that will not need to be 1432 // expanded, since it cannot be expanded. 1433 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) { 1434 // 100,000 classes seems like a good size, so 100M assumes around 1K 1435 // per klass. The vtable and oopMap is embedded so we don't have a fixed 1436 // size per klass. Eventually, this will be parameterized because it 1437 // would also be useful to determine the optimal size of the 1438 // systemDictionary. 1439 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M); 1440 } 1441 } 1442 // Also checks that certain machines are slower with compressed oops 1443 // in vm_version initialization code. 1444 #endif // _LP64 1445 #endif // !ZERO 1446 } 1447 1448 void Arguments::set_parallel_gc_flags() { 1449 assert(UseParallelGC || UseParallelOldGC, "Error"); 1450 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1451 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1452 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1453 } 1454 FLAG_SET_DEFAULT(UseParallelGC, true); 1455 1456 // If no heap maximum was requested explicitly, use some reasonable fraction 1457 // of the physical memory, up to a maximum of 1GB. 1458 FLAG_SET_DEFAULT(ParallelGCThreads, 1459 Abstract_VM_Version::parallel_worker_threads()); 1460 if (ParallelGCThreads == 0) { 1461 jio_fprintf(defaultStream::error_stream(), 1462 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1463 vm_exit(1); 1464 } 1465 1466 1467 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1468 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1469 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1470 // See CR 6362902 for details. 1471 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1472 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1473 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1474 } 1475 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1476 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1477 } 1478 } 1479 1480 if (UseParallelOldGC) { 1481 // Par compact uses lower default values since they are treated as 1482 // minimums. These are different defaults because of the different 1483 // interpretation and are not ergonomically set. 1484 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1485 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1486 } 1487 } 1488 } 1489 1490 void Arguments::set_g1_gc_flags() { 1491 assert(UseG1GC, "Error"); 1492 #ifdef COMPILER1 1493 FastTLABRefill = false; 1494 #endif 1495 FLAG_SET_DEFAULT(ParallelGCThreads, 1496 Abstract_VM_Version::parallel_worker_threads()); 1497 if (ParallelGCThreads == 0) { 1498 FLAG_SET_DEFAULT(ParallelGCThreads, 1499 Abstract_VM_Version::parallel_worker_threads()); 1500 } 1501 1502 // MarkStackSize will be set (if it hasn't been set by the user) 1503 // when concurrent marking is initialized. 1504 // Its value will be based upon the number of parallel marking threads. 1505 // But we do set the maximum mark stack size here. 1506 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1507 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1508 } 1509 1510 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1511 // In G1, we want the default GC overhead goal to be higher than 1512 // say in PS. So we set it here to 10%. Otherwise the heap might 1513 // be expanded more aggressively than we would like it to. In 1514 // fact, even 10% seems to not be high enough in some cases 1515 // (especially small GC stress tests that the main thing they do 1516 // is allocation). We might consider increase it further. 1517 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1518 } 1519 1520 if (PrintGCDetails && Verbose) { 1521 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1522 MarkStackSize / K, MarkStackSizeMax / K); 1523 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1524 } 1525 } 1526 1527 void Arguments::set_heap_size() { 1528 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1529 // Deprecated flag 1530 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1531 } 1532 1533 const julong phys_mem = 1534 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1535 : (julong)MaxRAM; 1536 1537 // If the maximum heap size has not been set with -Xmx, 1538 // then set it as fraction of the size of physical memory, 1539 // respecting the maximum and minimum sizes of the heap. 1540 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1541 julong reasonable_max = phys_mem / MaxRAMFraction; 1542 1543 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1544 // Small physical memory, so use a minimum fraction of it for the heap 1545 reasonable_max = phys_mem / MinRAMFraction; 1546 } else { 1547 // Not-small physical memory, so require a heap at least 1548 // as large as MaxHeapSize 1549 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1550 } 1551 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1552 // Limit the heap size to ErgoHeapSizeLimit 1553 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1554 } 1555 if (UseCompressedOops) { 1556 // Limit the heap size to the maximum possible when using compressed oops 1557 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1558 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1559 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1560 // but it should be not less than default MaxHeapSize. 1561 max_coop_heap -= HeapBaseMinAddress; 1562 } 1563 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1564 } 1565 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1566 1567 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1568 // An initial heap size was specified on the command line, 1569 // so be sure that the maximum size is consistent. Done 1570 // after call to allocatable_physical_memory because that 1571 // method might reduce the allocation size. 1572 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1573 } 1574 1575 if (PrintGCDetails && Verbose) { 1576 // Cannot use gclog_or_tty yet. 1577 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1578 } 1579 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1580 } 1581 1582 // If the initial_heap_size has not been set with InitialHeapSize 1583 // or -Xms, then set it as fraction of the size of physical memory, 1584 // respecting the maximum and minimum sizes of the heap. 1585 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1586 julong reasonable_minimum = (julong)(OldSize + NewSize); 1587 1588 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1589 1590 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1591 1592 julong reasonable_initial = phys_mem / InitialRAMFraction; 1593 1594 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1595 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1596 1597 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1598 1599 if (PrintGCDetails && Verbose) { 1600 // Cannot use gclog_or_tty yet. 1601 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1602 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1603 } 1604 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1605 set_min_heap_size((uintx)reasonable_minimum); 1606 } 1607 } 1608 1609 // This must be called after ergonomics because we want bytecode rewriting 1610 // if the server compiler is used, or if UseSharedSpaces is disabled. 1611 void Arguments::set_bytecode_flags() { 1612 // Better not attempt to store into a read-only space. 1613 if (UseSharedSpaces) { 1614 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1615 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1616 } 1617 1618 if (!RewriteBytecodes) { 1619 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1620 } 1621 } 1622 1623 // Aggressive optimization flags -XX:+AggressiveOpts 1624 void Arguments::set_aggressive_opts_flags() { 1625 #ifdef COMPILER2 1626 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1627 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1628 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1629 } 1630 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1631 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1632 } 1633 1634 // Feed the cache size setting into the JDK 1635 char buffer[1024]; 1636 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1637 add_property(buffer); 1638 } 1639 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1640 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1641 } 1642 #endif 1643 1644 if (AggressiveOpts) { 1645 // Sample flag setting code 1646 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1647 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1648 // } 1649 } 1650 } 1651 1652 //=========================================================================================================== 1653 // Parsing of java.compiler property 1654 1655 void Arguments::process_java_compiler_argument(char* arg) { 1656 // For backwards compatibility, Djava.compiler=NONE or "" 1657 // causes us to switch to -Xint mode UNLESS -Xdebug 1658 // is also specified. 1659 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1660 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1661 } 1662 } 1663 1664 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1665 _sun_java_launcher = strdup(launcher); 1666 if (strcmp("gamma", _sun_java_launcher) == 0) { 1667 _created_by_gamma_launcher = true; 1668 } 1669 } 1670 1671 bool Arguments::created_by_java_launcher() { 1672 assert(_sun_java_launcher != NULL, "property must have value"); 1673 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1674 } 1675 1676 bool Arguments::created_by_gamma_launcher() { 1677 return _created_by_gamma_launcher; 1678 } 1679 1680 //=========================================================================================================== 1681 // Parsing of main arguments 1682 1683 bool Arguments::verify_interval(uintx val, uintx min, 1684 uintx max, const char* name) { 1685 // Returns true iff value is in the inclusive interval [min..max] 1686 // false, otherwise. 1687 if (val >= min && val <= max) { 1688 return true; 1689 } 1690 jio_fprintf(defaultStream::error_stream(), 1691 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1692 " and " UINTX_FORMAT "\n", 1693 name, val, min, max); 1694 return false; 1695 } 1696 1697 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1698 // Returns true if given value is at least specified min threshold 1699 // false, otherwise. 1700 if (val >= min ) { 1701 return true; 1702 } 1703 jio_fprintf(defaultStream::error_stream(), 1704 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1705 name, val, min); 1706 return false; 1707 } 1708 1709 bool Arguments::verify_percentage(uintx value, const char* name) { 1710 if (value <= 100) { 1711 return true; 1712 } 1713 jio_fprintf(defaultStream::error_stream(), 1714 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1715 name, value); 1716 return false; 1717 } 1718 1719 static void force_serial_gc() { 1720 FLAG_SET_DEFAULT(UseSerialGC, true); 1721 FLAG_SET_DEFAULT(UseParNewGC, false); 1722 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1723 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1724 FLAG_SET_DEFAULT(UseParallelGC, false); 1725 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1726 FLAG_SET_DEFAULT(UseG1GC, false); 1727 } 1728 1729 static bool verify_serial_gc_flags() { 1730 return (UseSerialGC && 1731 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1732 UseParallelGC || UseParallelOldGC)); 1733 } 1734 1735 // check if do gclog rotation 1736 // +UseGCLogFileRotation is a must, 1737 // no gc log rotation when log file not supplied or 1738 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1739 void check_gclog_consistency() { 1740 if (UseGCLogFileRotation) { 1741 if ((Arguments::gc_log_filename() == NULL) || 1742 (NumberOfGCLogFiles == 0) || 1743 (GCLogFileSize == 0)) { 1744 jio_fprintf(defaultStream::output_stream(), 1745 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1746 "where num_of_file > 0 and num_of_size > 0\n" 1747 "GC log rotation is turned off\n"); 1748 UseGCLogFileRotation = false; 1749 } 1750 } 1751 1752 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1753 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1754 jio_fprintf(defaultStream::output_stream(), 1755 "GCLogFileSize changed to minimum 8K\n"); 1756 } 1757 } 1758 1759 // Check consistency of GC selection 1760 bool Arguments::check_gc_consistency() { 1761 check_gclog_consistency(); 1762 bool status = true; 1763 // Ensure that the user has not selected conflicting sets 1764 // of collectors. [Note: this check is merely a user convenience; 1765 // collectors over-ride each other so that only a non-conflicting 1766 // set is selected; however what the user gets is not what they 1767 // may have expected from the combination they asked for. It's 1768 // better to reduce user confusion by not allowing them to 1769 // select conflicting combinations. 1770 uint i = 0; 1771 if (UseSerialGC) i++; 1772 if (UseConcMarkSweepGC || UseParNewGC) i++; 1773 if (UseParallelGC || UseParallelOldGC) i++; 1774 if (UseG1GC) i++; 1775 if (i > 1) { 1776 jio_fprintf(defaultStream::error_stream(), 1777 "Conflicting collector combinations in option list; " 1778 "please refer to the release notes for the combinations " 1779 "allowed\n"); 1780 status = false; 1781 } 1782 1783 return status; 1784 } 1785 1786 void Arguments::check_deprecated_gcs() { 1787 if (UseConcMarkSweepGC && !UseParNewGC) { 1788 warning("Using the DefNew young collector with the CMS collector is deprecated " 1789 "and will likely be removed in a future release"); 1790 } 1791 1792 if (UseParNewGC && !UseConcMarkSweepGC) { 1793 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1794 // set up UseSerialGC properly, so that can't be used in the check here. 1795 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1796 "and will likely be removed in a future release"); 1797 } 1798 1799 if (CMSIncrementalMode) { 1800 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1801 } 1802 } 1803 1804 // Check stack pages settings 1805 bool Arguments::check_stack_pages() 1806 { 1807 bool status = true; 1808 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1809 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1810 // greater stack shadow pages can't generate instruction to bang stack 1811 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1812 return status; 1813 } 1814 1815 // Check the consistency of vm_init_args 1816 bool Arguments::check_vm_args_consistency() { 1817 // Method for adding checks for flag consistency. 1818 // The intent is to warn the user of all possible conflicts, 1819 // before returning an error. 1820 // Note: Needs platform-dependent factoring. 1821 bool status = true; 1822 1823 #if ( (defined(COMPILER2) && defined(SPARC))) 1824 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1825 // on sparc doesn't require generation of a stub as is the case on, e.g., 1826 // x86. Normally, VM_Version_init must be called from init_globals in 1827 // init.cpp, which is called by the initial java thread *after* arguments 1828 // have been parsed. VM_Version_init gets called twice on sparc. 1829 extern void VM_Version_init(); 1830 VM_Version_init(); 1831 if (!VM_Version::has_v9()) { 1832 jio_fprintf(defaultStream::error_stream(), 1833 "V8 Machine detected, Server requires V9\n"); 1834 status = false; 1835 } 1836 #endif /* COMPILER2 && SPARC */ 1837 1838 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1839 // builds so the cost of stack banging can be measured. 1840 #if (defined(PRODUCT) && defined(SOLARIS)) 1841 if (!UseBoundThreads && !UseStackBanging) { 1842 jio_fprintf(defaultStream::error_stream(), 1843 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1844 1845 status = false; 1846 } 1847 #endif 1848 1849 if (TLABRefillWasteFraction == 0) { 1850 jio_fprintf(defaultStream::error_stream(), 1851 "TLABRefillWasteFraction should be a denominator, " 1852 "not " SIZE_FORMAT "\n", 1853 TLABRefillWasteFraction); 1854 status = false; 1855 } 1856 1857 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1858 "AdaptiveSizePolicyWeight"); 1859 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1860 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1861 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1862 1863 // Divide by bucket size to prevent a large size from causing rollover when 1864 // calculating amount of memory needed to be allocated for the String table. 1865 status = status && verify_interval(StringTableSize, defaultStringTableSize, 1866 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1867 1868 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1869 jio_fprintf(defaultStream::error_stream(), 1870 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1871 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1872 MinHeapFreeRatio, MaxHeapFreeRatio); 1873 status = false; 1874 } 1875 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1876 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1877 1878 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1879 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1880 } 1881 1882 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1883 // Settings to encourage splitting. 1884 if (!FLAG_IS_CMDLINE(NewRatio)) { 1885 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1886 } 1887 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1888 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1889 } 1890 } 1891 1892 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1893 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1894 if (GCTimeLimit == 100) { 1895 // Turn off gc-overhead-limit-exceeded checks 1896 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1897 } 1898 1899 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1900 1901 status = status && check_gc_consistency(); 1902 status = status && check_stack_pages(); 1903 1904 if (_has_alloc_profile) { 1905 if (UseParallelGC || UseParallelOldGC) { 1906 jio_fprintf(defaultStream::error_stream(), 1907 "error: invalid argument combination.\n" 1908 "Allocation profiling (-Xaprof) cannot be used together with " 1909 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1910 status = false; 1911 } 1912 if (UseConcMarkSweepGC) { 1913 jio_fprintf(defaultStream::error_stream(), 1914 "error: invalid argument combination.\n" 1915 "Allocation profiling (-Xaprof) cannot be used together with " 1916 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1917 status = false; 1918 } 1919 } 1920 1921 if (CMSIncrementalMode) { 1922 if (!UseConcMarkSweepGC) { 1923 jio_fprintf(defaultStream::error_stream(), 1924 "error: invalid argument combination.\n" 1925 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1926 "selected in order\nto use CMSIncrementalMode.\n"); 1927 status = false; 1928 } else { 1929 status = status && verify_percentage(CMSIncrementalDutyCycle, 1930 "CMSIncrementalDutyCycle"); 1931 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1932 "CMSIncrementalDutyCycleMin"); 1933 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1934 "CMSIncrementalSafetyFactor"); 1935 status = status && verify_percentage(CMSIncrementalOffset, 1936 "CMSIncrementalOffset"); 1937 status = status && verify_percentage(CMSExpAvgFactor, 1938 "CMSExpAvgFactor"); 1939 // If it was not set on the command line, set 1940 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1941 if (CMSInitiatingOccupancyFraction < 0) { 1942 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1943 } 1944 } 1945 } 1946 1947 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1948 // insists that we hold the requisite locks so that the iteration is 1949 // MT-safe. For the verification at start-up and shut-down, we don't 1950 // yet have a good way of acquiring and releasing these locks, 1951 // which are not visible at the CollectedHeap level. We want to 1952 // be able to acquire these locks and then do the iteration rather 1953 // than just disable the lock verification. This will be fixed under 1954 // bug 4788986. 1955 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1956 if (VerifyGCStartAt == 0) { 1957 warning("Heap verification at start-up disabled " 1958 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1959 VerifyGCStartAt = 1; // Disable verification at start-up 1960 } 1961 if (VerifyBeforeExit) { 1962 warning("Heap verification at shutdown disabled " 1963 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1964 VerifyBeforeExit = false; // Disable verification at shutdown 1965 } 1966 } 1967 1968 // Note: only executed in non-PRODUCT mode 1969 if (!UseAsyncConcMarkSweepGC && 1970 (ExplicitGCInvokesConcurrent || 1971 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1972 jio_fprintf(defaultStream::error_stream(), 1973 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1974 " with -UseAsyncConcMarkSweepGC"); 1975 status = false; 1976 } 1977 1978 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 1979 1980 #if INCLUDE_ALL_GCS 1981 if (UseG1GC) { 1982 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1983 "InitiatingHeapOccupancyPercent"); 1984 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1985 "G1RefProcDrainInterval"); 1986 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1987 "G1ConcMarkStepDurationMillis"); 1988 } 1989 #endif // INCLUDE_ALL_GCS 1990 1991 status = status && verify_interval(RefDiscoveryPolicy, 1992 ReferenceProcessor::DiscoveryPolicyMin, 1993 ReferenceProcessor::DiscoveryPolicyMax, 1994 "RefDiscoveryPolicy"); 1995 1996 // Limit the lower bound of this flag to 1 as it is used in a division 1997 // expression. 1998 status = status && verify_interval(TLABWasteTargetPercent, 1999 1, 100, "TLABWasteTargetPercent"); 2000 2001 status = status && verify_object_alignment(); 2002 2003 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 2004 "ClassMetaspaceSize"); 2005 2006 status = status && verify_interval(MarkStackSizeMax, 2007 1, (max_jint - 1), "MarkStackSizeMax"); 2008 2009 #ifdef SPARC 2010 if (UseConcMarkSweepGC || UseG1GC) { 2011 // Issue a stern warning if the user has explicitly set 2012 // UseMemSetInBOT (it is known to cause issues), but allow 2013 // use for experimentation and debugging. 2014 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2015 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2016 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2017 " on sun4v; please understand that you are using at your own risk!"); 2018 } 2019 } 2020 #endif // SPARC 2021 2022 if (PrintNMTStatistics) { 2023 #if INCLUDE_NMT 2024 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2025 #endif // INCLUDE_NMT 2026 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2027 PrintNMTStatistics = false; 2028 #if INCLUDE_NMT 2029 } 2030 #endif 2031 } 2032 2033 return status; 2034 } 2035 2036 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2037 const char* option_type) { 2038 if (ignore) return false; 2039 2040 const char* spacer = " "; 2041 if (option_type == NULL) { 2042 option_type = ++spacer; // Set both to the empty string. 2043 } 2044 2045 if (os::obsolete_option(option)) { 2046 jio_fprintf(defaultStream::error_stream(), 2047 "Obsolete %s%soption: %s\n", option_type, spacer, 2048 option->optionString); 2049 return false; 2050 } else { 2051 jio_fprintf(defaultStream::error_stream(), 2052 "Unrecognized %s%soption: %s\n", option_type, spacer, 2053 option->optionString); 2054 return true; 2055 } 2056 } 2057 2058 static const char* user_assertion_options[] = { 2059 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2060 }; 2061 2062 static const char* system_assertion_options[] = { 2063 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2064 }; 2065 2066 // Return true if any of the strings in null-terminated array 'names' matches. 2067 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2068 // the option must match exactly. 2069 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2070 bool tail_allowed) { 2071 for (/* empty */; *names != NULL; ++names) { 2072 if (match_option(option, *names, tail)) { 2073 if (**tail == '\0' || tail_allowed && **tail == ':') { 2074 return true; 2075 } 2076 } 2077 } 2078 return false; 2079 } 2080 2081 bool Arguments::parse_uintx(const char* value, 2082 uintx* uintx_arg, 2083 uintx min_size) { 2084 2085 // Check the sign first since atomull() parses only unsigned values. 2086 bool value_is_positive = !(*value == '-'); 2087 2088 if (value_is_positive) { 2089 julong n; 2090 bool good_return = atomull(value, &n); 2091 if (good_return) { 2092 bool above_minimum = n >= min_size; 2093 bool value_is_too_large = n > max_uintx; 2094 2095 if (above_minimum && !value_is_too_large) { 2096 *uintx_arg = n; 2097 return true; 2098 } 2099 } 2100 } 2101 return false; 2102 } 2103 2104 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2105 julong* long_arg, 2106 julong min_size) { 2107 if (!atomull(s, long_arg)) return arg_unreadable; 2108 return check_memory_size(*long_arg, min_size); 2109 } 2110 2111 // Parse JavaVMInitArgs structure 2112 2113 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2114 // For components of the system classpath. 2115 SysClassPath scp(Arguments::get_sysclasspath()); 2116 bool scp_assembly_required = false; 2117 2118 // Save default settings for some mode flags 2119 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2120 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2121 Arguments::_ClipInlining = ClipInlining; 2122 Arguments::_BackgroundCompilation = BackgroundCompilation; 2123 2124 // Setup flags for mixed which is the default 2125 set_mode_flags(_mixed); 2126 2127 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2128 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2129 if (result != JNI_OK) { 2130 return result; 2131 } 2132 2133 // Parse JavaVMInitArgs structure passed in 2134 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2135 if (result != JNI_OK) { 2136 return result; 2137 } 2138 2139 if (AggressiveOpts) { 2140 // Insert alt-rt.jar between user-specified bootclasspath 2141 // prefix and the default bootclasspath. os::set_boot_path() 2142 // uses meta_index_dir as the default bootclasspath directory. 2143 const char* altclasses_jar = "alt-rt.jar"; 2144 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2145 strlen(altclasses_jar); 2146 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2147 strcpy(altclasses_path, get_meta_index_dir()); 2148 strcat(altclasses_path, altclasses_jar); 2149 scp.add_suffix_to_prefix(altclasses_path); 2150 scp_assembly_required = true; 2151 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2152 } 2153 2154 if (WhiteBoxAPI) { 2155 // Append wb.jar to bootclasspath if enabled 2156 const char* wb_jar = "wb.jar"; 2157 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 + 2158 strlen(wb_jar); 2159 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal); 2160 strcpy(wb_path, get_meta_index_dir()); 2161 strcat(wb_path, wb_jar); 2162 scp.add_suffix(wb_path); 2163 scp_assembly_required = true; 2164 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal); 2165 } 2166 2167 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2168 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2169 if (result != JNI_OK) { 2170 return result; 2171 } 2172 2173 // Do final processing now that all arguments have been parsed 2174 result = finalize_vm_init_args(&scp, scp_assembly_required); 2175 if (result != JNI_OK) { 2176 return result; 2177 } 2178 2179 return JNI_OK; 2180 } 2181 2182 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2183 SysClassPath* scp_p, 2184 bool* scp_assembly_required_p, 2185 FlagValueOrigin origin) { 2186 // Remaining part of option string 2187 const char* tail; 2188 2189 // iterate over arguments 2190 for (int index = 0; index < args->nOptions; index++) { 2191 bool is_absolute_path = false; // for -agentpath vs -agentlib 2192 2193 const JavaVMOption* option = args->options + index; 2194 2195 if (!match_option(option, "-Djava.class.path", &tail) && 2196 !match_option(option, "-Dsun.java.command", &tail) && 2197 !match_option(option, "-Dsun.java.launcher", &tail)) { 2198 2199 // add all jvm options to the jvm_args string. This string 2200 // is used later to set the java.vm.args PerfData string constant. 2201 // the -Djava.class.path and the -Dsun.java.command options are 2202 // omitted from jvm_args string as each have their own PerfData 2203 // string constant object. 2204 build_jvm_args(option->optionString); 2205 } 2206 2207 // -verbose:[class/gc/jni] 2208 if (match_option(option, "-verbose", &tail)) { 2209 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2210 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2211 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2212 } else if (!strcmp(tail, ":gc")) { 2213 FLAG_SET_CMDLINE(bool, PrintGC, true); 2214 } else if (!strcmp(tail, ":jni")) { 2215 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2216 } 2217 // -da / -ea / -disableassertions / -enableassertions 2218 // These accept an optional class/package name separated by a colon, e.g., 2219 // -da:java.lang.Thread. 2220 } else if (match_option(option, user_assertion_options, &tail, true)) { 2221 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2222 if (*tail == '\0') { 2223 JavaAssertions::setUserClassDefault(enable); 2224 } else { 2225 assert(*tail == ':', "bogus match by match_option()"); 2226 JavaAssertions::addOption(tail + 1, enable); 2227 } 2228 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2229 } else if (match_option(option, system_assertion_options, &tail, false)) { 2230 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2231 JavaAssertions::setSystemClassDefault(enable); 2232 // -bootclasspath: 2233 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2234 scp_p->reset_path(tail); 2235 *scp_assembly_required_p = true; 2236 // -bootclasspath/a: 2237 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2238 scp_p->add_suffix(tail); 2239 *scp_assembly_required_p = true; 2240 // -bootclasspath/p: 2241 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2242 scp_p->add_prefix(tail); 2243 *scp_assembly_required_p = true; 2244 // -Xrun 2245 } else if (match_option(option, "-Xrun", &tail)) { 2246 if (tail != NULL) { 2247 const char* pos = strchr(tail, ':'); 2248 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2249 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2250 name[len] = '\0'; 2251 2252 char *options = NULL; 2253 if(pos != NULL) { 2254 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2255 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2256 } 2257 #if !INCLUDE_JVMTI 2258 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2259 warning("profiling and debugging agents are not supported in this VM"); 2260 } else 2261 #endif // !INCLUDE_JVMTI 2262 add_init_library(name, options); 2263 } 2264 // -agentlib and -agentpath 2265 } else if (match_option(option, "-agentlib:", &tail) || 2266 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2267 if(tail != NULL) { 2268 const char* pos = strchr(tail, '='); 2269 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2270 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2271 name[len] = '\0'; 2272 2273 char *options = NULL; 2274 if(pos != NULL) { 2275 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2276 } 2277 #if !INCLUDE_JVMTI 2278 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2279 warning("profiling and debugging agents are not supported in this VM"); 2280 } else 2281 #endif // !INCLUDE_JVMTI 2282 add_init_agent(name, options, is_absolute_path); 2283 2284 } 2285 // -javaagent 2286 } else if (match_option(option, "-javaagent:", &tail)) { 2287 #if !INCLUDE_JVMTI 2288 warning("Instrumentation agents are not supported in this VM"); 2289 #else 2290 if(tail != NULL) { 2291 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2292 add_init_agent("instrument", options, false); 2293 } 2294 #endif // !INCLUDE_JVMTI 2295 // -Xnoclassgc 2296 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2297 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2298 // -Xincgc: i-CMS 2299 } else if (match_option(option, "-Xincgc", &tail)) { 2300 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2301 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2302 // -Xnoincgc: no i-CMS 2303 } else if (match_option(option, "-Xnoincgc", &tail)) { 2304 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2305 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2306 // -Xconcgc 2307 } else if (match_option(option, "-Xconcgc", &tail)) { 2308 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2309 // -Xnoconcgc 2310 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2311 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2312 // -Xbatch 2313 } else if (match_option(option, "-Xbatch", &tail)) { 2314 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2315 // -Xmn for compatibility with other JVM vendors 2316 } else if (match_option(option, "-Xmn", &tail)) { 2317 julong long_initial_eden_size = 0; 2318 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2319 if (errcode != arg_in_range) { 2320 jio_fprintf(defaultStream::error_stream(), 2321 "Invalid initial eden size: %s\n", option->optionString); 2322 describe_range_error(errcode); 2323 return JNI_EINVAL; 2324 } 2325 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2326 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2327 // -Xms 2328 } else if (match_option(option, "-Xms", &tail)) { 2329 julong long_initial_heap_size = 0; 2330 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2331 if (errcode != arg_in_range) { 2332 jio_fprintf(defaultStream::error_stream(), 2333 "Invalid initial heap size: %s\n", option->optionString); 2334 describe_range_error(errcode); 2335 return JNI_EINVAL; 2336 } 2337 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2338 // Currently the minimum size and the initial heap sizes are the same. 2339 set_min_heap_size(InitialHeapSize); 2340 // -Xmx 2341 } else if (match_option(option, "-Xmx", &tail)) { 2342 julong long_max_heap_size = 0; 2343 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2344 if (errcode != arg_in_range) { 2345 jio_fprintf(defaultStream::error_stream(), 2346 "Invalid maximum heap size: %s\n", option->optionString); 2347 describe_range_error(errcode); 2348 return JNI_EINVAL; 2349 } 2350 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2351 // Xmaxf 2352 } else if (match_option(option, "-Xmaxf", &tail)) { 2353 int maxf = (int)(atof(tail) * 100); 2354 if (maxf < 0 || maxf > 100) { 2355 jio_fprintf(defaultStream::error_stream(), 2356 "Bad max heap free percentage size: %s\n", 2357 option->optionString); 2358 return JNI_EINVAL; 2359 } else { 2360 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2361 } 2362 // Xminf 2363 } else if (match_option(option, "-Xminf", &tail)) { 2364 int minf = (int)(atof(tail) * 100); 2365 if (minf < 0 || minf > 100) { 2366 jio_fprintf(defaultStream::error_stream(), 2367 "Bad min heap free percentage size: %s\n", 2368 option->optionString); 2369 return JNI_EINVAL; 2370 } else { 2371 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2372 } 2373 // -Xss 2374 } else if (match_option(option, "-Xss", &tail)) { 2375 julong long_ThreadStackSize = 0; 2376 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2377 if (errcode != arg_in_range) { 2378 jio_fprintf(defaultStream::error_stream(), 2379 "Invalid thread stack size: %s\n", option->optionString); 2380 describe_range_error(errcode); 2381 return JNI_EINVAL; 2382 } 2383 // Internally track ThreadStackSize in units of 1024 bytes. 2384 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2385 round_to((int)long_ThreadStackSize, K) / K); 2386 // -Xoss 2387 } else if (match_option(option, "-Xoss", &tail)) { 2388 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2389 // -Xmaxjitcodesize 2390 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2391 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2392 julong long_ReservedCodeCacheSize = 0; 2393 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2394 (size_t)InitialCodeCacheSize); 2395 if (errcode != arg_in_range) { 2396 jio_fprintf(defaultStream::error_stream(), 2397 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2398 option->optionString, InitialCodeCacheSize/K); 2399 describe_range_error(errcode); 2400 return JNI_EINVAL; 2401 } 2402 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2403 // -green 2404 } else if (match_option(option, "-green", &tail)) { 2405 jio_fprintf(defaultStream::error_stream(), 2406 "Green threads support not available\n"); 2407 return JNI_EINVAL; 2408 // -native 2409 } else if (match_option(option, "-native", &tail)) { 2410 // HotSpot always uses native threads, ignore silently for compatibility 2411 // -Xsqnopause 2412 } else if (match_option(option, "-Xsqnopause", &tail)) { 2413 // EVM option, ignore silently for compatibility 2414 // -Xrs 2415 } else if (match_option(option, "-Xrs", &tail)) { 2416 // Classic/EVM option, new functionality 2417 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2418 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2419 // change default internal VM signals used - lower case for back compat 2420 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2421 // -Xoptimize 2422 } else if (match_option(option, "-Xoptimize", &tail)) { 2423 // EVM option, ignore silently for compatibility 2424 // -Xprof 2425 } else if (match_option(option, "-Xprof", &tail)) { 2426 #if INCLUDE_FPROF 2427 _has_profile = true; 2428 #else // INCLUDE_FPROF 2429 // do we have to exit? 2430 warning("Flat profiling is not supported in this VM."); 2431 #endif // INCLUDE_FPROF 2432 // -Xaprof 2433 } else if (match_option(option, "-Xaprof", &tail)) { 2434 _has_alloc_profile = true; 2435 // -Xconcurrentio 2436 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2437 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2438 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2439 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2440 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2441 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2442 2443 // -Xinternalversion 2444 } else if (match_option(option, "-Xinternalversion", &tail)) { 2445 jio_fprintf(defaultStream::output_stream(), "%s\n", 2446 VM_Version::internal_vm_info_string()); 2447 vm_exit(0); 2448 #ifndef PRODUCT 2449 // -Xprintflags 2450 } else if (match_option(option, "-Xprintflags", &tail)) { 2451 CommandLineFlags::printFlags(tty, false); 2452 vm_exit(0); 2453 #endif 2454 // -D 2455 } else if (match_option(option, "-D", &tail)) { 2456 if (!add_property(tail)) { 2457 return JNI_ENOMEM; 2458 } 2459 // Out of the box management support 2460 if (match_option(option, "-Dcom.sun.management", &tail)) { 2461 #if INCLUDE_MANAGEMENT 2462 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2463 #else 2464 vm_exit_during_initialization( 2465 "-Dcom.sun.management is not supported in this VM.", NULL); 2466 #endif 2467 } 2468 // -Xint 2469 } else if (match_option(option, "-Xint", &tail)) { 2470 set_mode_flags(_int); 2471 // -Xmixed 2472 } else if (match_option(option, "-Xmixed", &tail)) { 2473 set_mode_flags(_mixed); 2474 // -Xcomp 2475 } else if (match_option(option, "-Xcomp", &tail)) { 2476 // for testing the compiler; turn off all flags that inhibit compilation 2477 set_mode_flags(_comp); 2478 2479 // -Xshare:dump 2480 } else if (match_option(option, "-Xshare:dump", &tail)) { 2481 #if defined(KERNEL) 2482 vm_exit_during_initialization( 2483 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2484 #elif !INCLUDE_CDS 2485 vm_exit_during_initialization( 2486 "Dumping a shared archive is not supported in this VM.", NULL); 2487 #else 2488 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2489 set_mode_flags(_int); // Prevent compilation, which creates objects 2490 #endif 2491 // -Xshare:on 2492 } else if (match_option(option, "-Xshare:on", &tail)) { 2493 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2494 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2495 // -Xshare:auto 2496 } else if (match_option(option, "-Xshare:auto", &tail)) { 2497 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2498 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2499 // -Xshare:off 2500 } else if (match_option(option, "-Xshare:off", &tail)) { 2501 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2502 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2503 2504 // -Xverify 2505 } else if (match_option(option, "-Xverify", &tail)) { 2506 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2507 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2508 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2509 } else if (strcmp(tail, ":remote") == 0) { 2510 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2511 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2512 } else if (strcmp(tail, ":none") == 0) { 2513 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2514 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2515 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2516 return JNI_EINVAL; 2517 } 2518 // -Xdebug 2519 } else if (match_option(option, "-Xdebug", &tail)) { 2520 // note this flag has been used, then ignore 2521 set_xdebug_mode(true); 2522 // -Xnoagent 2523 } else if (match_option(option, "-Xnoagent", &tail)) { 2524 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2525 } else if (match_option(option, "-Xboundthreads", &tail)) { 2526 // Bind user level threads to kernel threads (Solaris only) 2527 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2528 } else if (match_option(option, "-Xloggc:", &tail)) { 2529 // Redirect GC output to the file. -Xloggc:<filename> 2530 // ostream_init_log(), when called will use this filename 2531 // to initialize a fileStream. 2532 _gc_log_filename = strdup(tail); 2533 FLAG_SET_CMDLINE(bool, PrintGC, true); 2534 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2535 2536 // JNI hooks 2537 } else if (match_option(option, "-Xcheck", &tail)) { 2538 if (!strcmp(tail, ":jni")) { 2539 #if !INCLUDE_JNI_CHECK 2540 warning("JNI CHECKING is not supported in this VM"); 2541 #else 2542 CheckJNICalls = true; 2543 #endif // INCLUDE_JNI_CHECK 2544 } else if (is_bad_option(option, args->ignoreUnrecognized, 2545 "check")) { 2546 return JNI_EINVAL; 2547 } 2548 } else if (match_option(option, "vfprintf", &tail)) { 2549 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2550 } else if (match_option(option, "exit", &tail)) { 2551 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2552 } else if (match_option(option, "abort", &tail)) { 2553 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2554 // -XX:+AggressiveHeap 2555 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2556 2557 // This option inspects the machine and attempts to set various 2558 // parameters to be optimal for long-running, memory allocation 2559 // intensive jobs. It is intended for machines with large 2560 // amounts of cpu and memory. 2561 2562 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2563 // VM, but we may not be able to represent the total physical memory 2564 // available (like having 8gb of memory on a box but using a 32bit VM). 2565 // Thus, we need to make sure we're using a julong for intermediate 2566 // calculations. 2567 julong initHeapSize; 2568 julong total_memory = os::physical_memory(); 2569 2570 if (total_memory < (julong)256*M) { 2571 jio_fprintf(defaultStream::error_stream(), 2572 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2573 vm_exit(1); 2574 } 2575 2576 // The heap size is half of available memory, or (at most) 2577 // all of possible memory less 160mb (leaving room for the OS 2578 // when using ISM). This is the maximum; because adaptive sizing 2579 // is turned on below, the actual space used may be smaller. 2580 2581 initHeapSize = MIN2(total_memory / (julong)2, 2582 total_memory - (julong)160*M); 2583 2584 // Make sure that if we have a lot of memory we cap the 32 bit 2585 // process space. The 64bit VM version of this function is a nop. 2586 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2587 2588 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2589 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2590 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2591 // Currently the minimum size and the initial heap sizes are the same. 2592 set_min_heap_size(initHeapSize); 2593 } 2594 if (FLAG_IS_DEFAULT(NewSize)) { 2595 // Make the young generation 3/8ths of the total heap. 2596 FLAG_SET_CMDLINE(uintx, NewSize, 2597 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2598 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2599 } 2600 2601 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2602 FLAG_SET_DEFAULT(UseLargePages, true); 2603 #endif 2604 2605 // Increase some data structure sizes for efficiency 2606 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2607 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2608 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2609 2610 // See the OldPLABSize comment below, but replace 'after promotion' 2611 // with 'after copying'. YoungPLABSize is the size of the survivor 2612 // space per-gc-thread buffers. The default is 4kw. 2613 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2614 2615 // OldPLABSize is the size of the buffers in the old gen that 2616 // UseParallelGC uses to promote live data that doesn't fit in the 2617 // survivor spaces. At any given time, there's one for each gc thread. 2618 // The default size is 1kw. These buffers are rarely used, since the 2619 // survivor spaces are usually big enough. For specjbb, however, there 2620 // are occasions when there's lots of live data in the young gen 2621 // and we end up promoting some of it. We don't have a definite 2622 // explanation for why bumping OldPLABSize helps, but the theory 2623 // is that a bigger PLAB results in retaining something like the 2624 // original allocation order after promotion, which improves mutator 2625 // locality. A minor effect may be that larger PLABs reduce the 2626 // number of PLAB allocation events during gc. The value of 8kw 2627 // was arrived at by experimenting with specjbb. 2628 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2629 2630 // Enable parallel GC and adaptive generation sizing 2631 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2632 FLAG_SET_DEFAULT(ParallelGCThreads, 2633 Abstract_VM_Version::parallel_worker_threads()); 2634 2635 // Encourage steady state memory management 2636 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2637 2638 // This appears to improve mutator locality 2639 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2640 2641 // Get around early Solaris scheduling bug 2642 // (affinity vs other jobs on system) 2643 // but disallow DR and offlining (5008695). 2644 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2645 2646 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2647 // The last option must always win. 2648 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2649 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2650 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2651 // The last option must always win. 2652 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2653 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2654 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2655 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2656 jio_fprintf(defaultStream::error_stream(), 2657 "Please use CMSClassUnloadingEnabled in place of " 2658 "CMSPermGenSweepingEnabled in the future\n"); 2659 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2660 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2661 jio_fprintf(defaultStream::error_stream(), 2662 "Please use -XX:+UseGCOverheadLimit in place of " 2663 "-XX:+UseGCTimeLimit in the future\n"); 2664 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2665 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2666 jio_fprintf(defaultStream::error_stream(), 2667 "Please use -XX:-UseGCOverheadLimit in place of " 2668 "-XX:-UseGCTimeLimit in the future\n"); 2669 // The TLE options are for compatibility with 1.3 and will be 2670 // removed without notice in a future release. These options 2671 // are not to be documented. 2672 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2673 // No longer used. 2674 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2675 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2676 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2677 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2678 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2679 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2680 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2681 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2682 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2683 // No longer used. 2684 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2685 julong long_tlab_size = 0; 2686 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2687 if (errcode != arg_in_range) { 2688 jio_fprintf(defaultStream::error_stream(), 2689 "Invalid TLAB size: %s\n", option->optionString); 2690 describe_range_error(errcode); 2691 return JNI_EINVAL; 2692 } 2693 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2694 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2695 // No longer used. 2696 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2697 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2698 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2699 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2700 SOLARIS_ONLY( 2701 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2702 warning("-XX:+UsePermISM is obsolete."); 2703 FLAG_SET_CMDLINE(bool, UseISM, true); 2704 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2705 FLAG_SET_CMDLINE(bool, UseISM, false); 2706 ) 2707 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2708 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2709 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2710 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2711 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2712 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2713 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2714 #if defined(DTRACE_ENABLED) 2715 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2716 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2717 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2718 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2719 #else // defined(DTRACE_ENABLED) 2720 jio_fprintf(defaultStream::error_stream(), 2721 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2722 return JNI_EINVAL; 2723 #endif // defined(DTRACE_ENABLED) 2724 #ifdef ASSERT 2725 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2726 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2727 // disable scavenge before parallel mark-compact 2728 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2729 #endif 2730 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2731 julong cms_blocks_to_claim = (julong)atol(tail); 2732 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2733 jio_fprintf(defaultStream::error_stream(), 2734 "Please use -XX:OldPLABSize in place of " 2735 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2736 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2737 julong cms_blocks_to_claim = (julong)atol(tail); 2738 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2739 jio_fprintf(defaultStream::error_stream(), 2740 "Please use -XX:OldPLABSize in place of " 2741 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2742 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2743 julong old_plab_size = 0; 2744 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2745 if (errcode != arg_in_range) { 2746 jio_fprintf(defaultStream::error_stream(), 2747 "Invalid old PLAB size: %s\n", option->optionString); 2748 describe_range_error(errcode); 2749 return JNI_EINVAL; 2750 } 2751 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2752 jio_fprintf(defaultStream::error_stream(), 2753 "Please use -XX:OldPLABSize in place of " 2754 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2755 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2756 julong young_plab_size = 0; 2757 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2758 if (errcode != arg_in_range) { 2759 jio_fprintf(defaultStream::error_stream(), 2760 "Invalid young PLAB size: %s\n", option->optionString); 2761 describe_range_error(errcode); 2762 return JNI_EINVAL; 2763 } 2764 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2765 jio_fprintf(defaultStream::error_stream(), 2766 "Please use -XX:YoungPLABSize in place of " 2767 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2768 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2769 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2770 julong stack_size = 0; 2771 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2772 if (errcode != arg_in_range) { 2773 jio_fprintf(defaultStream::error_stream(), 2774 "Invalid mark stack size: %s\n", option->optionString); 2775 describe_range_error(errcode); 2776 return JNI_EINVAL; 2777 } 2778 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2779 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2780 julong max_stack_size = 0; 2781 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2782 if (errcode != arg_in_range) { 2783 jio_fprintf(defaultStream::error_stream(), 2784 "Invalid maximum mark stack size: %s\n", 2785 option->optionString); 2786 describe_range_error(errcode); 2787 return JNI_EINVAL; 2788 } 2789 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2790 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2791 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2792 uintx conc_threads = 0; 2793 if (!parse_uintx(tail, &conc_threads, 1)) { 2794 jio_fprintf(defaultStream::error_stream(), 2795 "Invalid concurrent threads: %s\n", option->optionString); 2796 return JNI_EINVAL; 2797 } 2798 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2799 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 2800 julong max_direct_memory_size = 0; 2801 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 2802 if (errcode != arg_in_range) { 2803 jio_fprintf(defaultStream::error_stream(), 2804 "Invalid maximum direct memory size: %s\n", 2805 option->optionString); 2806 describe_range_error(errcode); 2807 return JNI_EINVAL; 2808 } 2809 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 2810 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 2811 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 2812 // away and will cause VM initialization failures! 2813 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 2814 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 2815 #if !INCLUDE_MANAGEMENT 2816 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 2817 vm_exit_during_initialization( 2818 "ManagementServer is not supported in this VM.", NULL); 2819 #endif // INCLUDE_MANAGEMENT 2820 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2821 // Skip -XX:Flags= since that case has already been handled 2822 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2823 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2824 return JNI_EINVAL; 2825 } 2826 } 2827 // Unknown option 2828 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2829 return JNI_ERR; 2830 } 2831 } 2832 2833 // Change the default value for flags which have different default values 2834 // when working with older JDKs. 2835 #ifdef LINUX 2836 if (JDK_Version::current().compare_major(6) <= 0 && 2837 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2838 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2839 } 2840 #endif // LINUX 2841 return JNI_OK; 2842 } 2843 2844 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2845 // This must be done after all -D arguments have been processed. 2846 scp_p->expand_endorsed(); 2847 2848 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2849 // Assemble the bootclasspath elements into the final path. 2850 Arguments::set_sysclasspath(scp_p->combined_path()); 2851 } 2852 2853 // This must be done after all arguments have been processed. 2854 // java_compiler() true means set to "NONE" or empty. 2855 if (java_compiler() && !xdebug_mode()) { 2856 // For backwards compatibility, we switch to interpreted mode if 2857 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2858 // not specified. 2859 set_mode_flags(_int); 2860 } 2861 if (CompileThreshold == 0) { 2862 set_mode_flags(_int); 2863 } 2864 2865 #ifndef COMPILER2 2866 // Don't degrade server performance for footprint 2867 if (FLAG_IS_DEFAULT(UseLargePages) && 2868 MaxHeapSize < LargePageHeapSizeThreshold) { 2869 // No need for large granularity pages w/small heaps. 2870 // Note that large pages are enabled/disabled for both the 2871 // Java heap and the code cache. 2872 FLAG_SET_DEFAULT(UseLargePages, false); 2873 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2874 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2875 } 2876 2877 // Tiered compilation is undefined with C1. 2878 TieredCompilation = false; 2879 #else 2880 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2881 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2882 } 2883 #endif 2884 2885 // If we are running in a headless jre, force java.awt.headless property 2886 // to be true unless the property has already been set. 2887 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2888 if (os::is_headless_jre()) { 2889 const char* headless = Arguments::get_property("java.awt.headless"); 2890 if (headless == NULL) { 2891 char envbuffer[128]; 2892 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2893 if (!add_property("java.awt.headless=true")) { 2894 return JNI_ENOMEM; 2895 } 2896 } else { 2897 char buffer[256]; 2898 strcpy(buffer, "java.awt.headless="); 2899 strcat(buffer, envbuffer); 2900 if (!add_property(buffer)) { 2901 return JNI_ENOMEM; 2902 } 2903 } 2904 } 2905 } 2906 2907 if (!check_vm_args_consistency()) { 2908 return JNI_ERR; 2909 } 2910 2911 return JNI_OK; 2912 } 2913 2914 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2915 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2916 scp_assembly_required_p); 2917 } 2918 2919 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2920 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2921 scp_assembly_required_p); 2922 } 2923 2924 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2925 const int N_MAX_OPTIONS = 64; 2926 const int OPTION_BUFFER_SIZE = 1024; 2927 char buffer[OPTION_BUFFER_SIZE]; 2928 2929 // The variable will be ignored if it exceeds the length of the buffer. 2930 // Don't check this variable if user has special privileges 2931 // (e.g. unix su command). 2932 if (os::getenv(name, buffer, sizeof(buffer)) && 2933 !os::have_special_privileges()) { 2934 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2935 jio_fprintf(defaultStream::error_stream(), 2936 "Picked up %s: %s\n", name, buffer); 2937 char* rd = buffer; // pointer to the input string (rd) 2938 int i; 2939 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2940 while (isspace(*rd)) rd++; // skip whitespace 2941 if (*rd == 0) break; // we re done when the input string is read completely 2942 2943 // The output, option string, overwrites the input string. 2944 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2945 // input string (rd). 2946 char* wrt = rd; 2947 2948 options[i++].optionString = wrt; // Fill in option 2949 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2950 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2951 int quote = *rd; // matching quote to look for 2952 rd++; // don't copy open quote 2953 while (*rd != quote) { // include everything (even spaces) up until quote 2954 if (*rd == 0) { // string termination means unmatched string 2955 jio_fprintf(defaultStream::error_stream(), 2956 "Unmatched quote in %s\n", name); 2957 return JNI_ERR; 2958 } 2959 *wrt++ = *rd++; // copy to option string 2960 } 2961 rd++; // don't copy close quote 2962 } else { 2963 *wrt++ = *rd++; // copy to option string 2964 } 2965 } 2966 // Need to check if we're done before writing a NULL, 2967 // because the write could be to the byte that rd is pointing to. 2968 if (*rd++ == 0) { 2969 *wrt = 0; 2970 break; 2971 } 2972 *wrt = 0; // Zero terminate option 2973 } 2974 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2975 JavaVMInitArgs vm_args; 2976 vm_args.version = JNI_VERSION_1_2; 2977 vm_args.options = options; 2978 vm_args.nOptions = i; 2979 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2980 2981 if (PrintVMOptions) { 2982 const char* tail; 2983 for (int i = 0; i < vm_args.nOptions; i++) { 2984 const JavaVMOption *option = vm_args.options + i; 2985 if (match_option(option, "-XX:", &tail)) { 2986 logOption(tail); 2987 } 2988 } 2989 } 2990 2991 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2992 } 2993 return JNI_OK; 2994 } 2995 2996 void Arguments::set_shared_spaces_flags() { 2997 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 2998 const bool might_share = must_share || UseSharedSpaces; 2999 3000 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 3001 // static fields are incorrect in the archive. With some more clever 3002 // initialization, this restriction can probably be lifted. 3003 // ??? UseLargePages might be okay now 3004 const bool cannot_share = UseCompressedOops || 3005 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages)); 3006 if (cannot_share) { 3007 if (must_share) { 3008 warning("disabling large pages %s" 3009 "because of %s", "" LP64_ONLY("and compressed oops "), 3010 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 3011 FLAG_SET_CMDLINE(bool, UseLargePages, false); 3012 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 3013 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false)); 3014 } else { 3015 // Prefer compressed oops and large pages to class data sharing 3016 if (UseSharedSpaces && Verbose) { 3017 warning("turning off use of shared archive because of large pages%s", 3018 "" LP64_ONLY(" and/or compressed oops")); 3019 } 3020 no_shared_spaces(); 3021 } 3022 } else if (UseLargePages && might_share) { 3023 // Disable large pages to allow shared spaces. This is sub-optimal, since 3024 // there may not even be a shared archive to use. 3025 FLAG_SET_DEFAULT(UseLargePages, false); 3026 } 3027 3028 if (DumpSharedSpaces) { 3029 if (RequireSharedSpaces) { 3030 warning("cannot dump shared archive while using shared archive"); 3031 } 3032 UseSharedSpaces = false; 3033 } 3034 } 3035 3036 // Disable options not supported in this release, with a warning if they 3037 // were explicitly requested on the command-line 3038 #define UNSUPPORTED_OPTION(opt, description) \ 3039 do { \ 3040 if (opt) { \ 3041 if (FLAG_IS_CMDLINE(opt)) { \ 3042 warning(description " is disabled in this release."); \ 3043 } \ 3044 FLAG_SET_DEFAULT(opt, false); \ 3045 } \ 3046 } while(0) 3047 3048 // Parse entry point called from JNI_CreateJavaVM 3049 3050 jint Arguments::parse(const JavaVMInitArgs* args) { 3051 3052 // Sharing support 3053 // Construct the path to the archive 3054 char jvm_path[JVM_MAXPATHLEN]; 3055 os::jvm_path(jvm_path, sizeof(jvm_path)); 3056 char *end = strrchr(jvm_path, *os::file_separator()); 3057 if (end != NULL) *end = '\0'; 3058 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 3059 strlen(os::file_separator()) + 20, mtInternal); 3060 if (shared_archive_path == NULL) return JNI_ENOMEM; 3061 strcpy(shared_archive_path, jvm_path); 3062 strcat(shared_archive_path, os::file_separator()); 3063 strcat(shared_archive_path, "classes"); 3064 strcat(shared_archive_path, ".jsa"); 3065 SharedArchivePath = shared_archive_path; 3066 3067 // Remaining part of option string 3068 const char* tail; 3069 3070 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3071 const char* hotspotrc = ".hotspotrc"; 3072 bool settings_file_specified = false; 3073 bool needs_hotspotrc_warning = false; 3074 3075 const char* flags_file; 3076 int index; 3077 for (index = 0; index < args->nOptions; index++) { 3078 const JavaVMOption *option = args->options + index; 3079 if (match_option(option, "-XX:Flags=", &tail)) { 3080 flags_file = tail; 3081 settings_file_specified = true; 3082 } 3083 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3084 PrintVMOptions = true; 3085 } 3086 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3087 PrintVMOptions = false; 3088 } 3089 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3090 IgnoreUnrecognizedVMOptions = true; 3091 } 3092 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3093 IgnoreUnrecognizedVMOptions = false; 3094 } 3095 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3096 CommandLineFlags::printFlags(tty, false); 3097 vm_exit(0); 3098 } 3099 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3100 #if INCLUDE_NMT 3101 MemTracker::init_tracking_options(tail); 3102 #else 3103 warning("Native Memory Tracking is not supported in this VM"); 3104 #endif 3105 } 3106 3107 3108 #ifndef PRODUCT 3109 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3110 CommandLineFlags::printFlags(tty, true); 3111 vm_exit(0); 3112 } 3113 #endif 3114 } 3115 3116 if (IgnoreUnrecognizedVMOptions) { 3117 // uncast const to modify the flag args->ignoreUnrecognized 3118 *(jboolean*)(&args->ignoreUnrecognized) = true; 3119 } 3120 3121 // Parse specified settings file 3122 if (settings_file_specified) { 3123 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3124 return JNI_EINVAL; 3125 } 3126 } else { 3127 #ifdef ASSERT 3128 // Parse default .hotspotrc settings file 3129 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3130 return JNI_EINVAL; 3131 } 3132 #else 3133 struct stat buf; 3134 if (os::stat(hotspotrc, &buf) == 0) { 3135 needs_hotspotrc_warning = true; 3136 } 3137 #endif 3138 } 3139 3140 if (PrintVMOptions) { 3141 for (index = 0; index < args->nOptions; index++) { 3142 const JavaVMOption *option = args->options + index; 3143 if (match_option(option, "-XX:", &tail)) { 3144 logOption(tail); 3145 } 3146 } 3147 } 3148 3149 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3150 jint result = parse_vm_init_args(args); 3151 if (result != JNI_OK) { 3152 return result; 3153 } 3154 3155 // Delay warning until here so that we've had a chance to process 3156 // the -XX:-PrintWarnings flag 3157 if (needs_hotspotrc_warning) { 3158 warning("%s file is present but has been ignored. " 3159 "Run with -XX:Flags=%s to load the file.", 3160 hotspotrc, hotspotrc); 3161 } 3162 3163 #if (defined JAVASE_EMBEDDED || defined ARM) 3164 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3165 #endif 3166 3167 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3168 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3169 #endif 3170 3171 #if !INCLUDE_ALL_GCS 3172 if (UseParallelGC) { 3173 warning("Parallel GC is not supported in this VM. Using Serial GC."); 3174 } 3175 if (UseParallelOldGC) { 3176 warning("Parallel Old GC is not supported in this VM. Using Serial GC."); 3177 } 3178 if (UseConcMarkSweepGC) { 3179 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC."); 3180 } 3181 if (UseParNewGC) { 3182 warning("Par New GC is not supported in this VM. Using Serial GC."); 3183 } 3184 #endif // INCLUDE_ALL_GCS 3185 3186 #ifndef PRODUCT 3187 if (TraceBytecodesAt != 0) { 3188 TraceBytecodes = true; 3189 } 3190 if (CountCompiledCalls) { 3191 if (UseCounterDecay) { 3192 warning("UseCounterDecay disabled because CountCalls is set"); 3193 UseCounterDecay = false; 3194 } 3195 } 3196 #endif // PRODUCT 3197 3198 // JSR 292 is not supported before 1.7 3199 if (!JDK_Version::is_gte_jdk17x_version()) { 3200 if (EnableInvokeDynamic) { 3201 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3202 warning("JSR 292 is not supported before 1.7. Disabling support."); 3203 } 3204 EnableInvokeDynamic = false; 3205 } 3206 } 3207 3208 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3209 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3210 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3211 } 3212 ScavengeRootsInCode = 1; 3213 } 3214 3215 if (PrintGCDetails) { 3216 // Turn on -verbose:gc options as well 3217 PrintGC = true; 3218 } 3219 3220 if (!JDK_Version::is_gte_jdk18x_version()) { 3221 // To avoid changing the log format for 7 updates this flag is only 3222 // true by default in JDK8 and above. 3223 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3224 FLAG_SET_DEFAULT(PrintGCCause, false); 3225 } 3226 } 3227 3228 // Set object alignment values. 3229 set_object_alignment(); 3230 3231 #if !INCLUDE_ALL_GCS 3232 force_serial_gc(); 3233 #endif // INCLUDE_ALL_GCS 3234 #if !INCLUDE_CDS 3235 no_shared_spaces(); 3236 #endif // INCLUDE_CDS 3237 3238 // Set flags based on ergonomics. 3239 set_ergonomics_flags(); 3240 3241 set_shared_spaces_flags(); 3242 3243 // Check the GC selections again. 3244 if (!check_gc_consistency()) { 3245 return JNI_EINVAL; 3246 } 3247 3248 if (TieredCompilation) { 3249 set_tiered_flags(); 3250 } else { 3251 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3252 if (CompilationPolicyChoice >= 2) { 3253 vm_exit_during_initialization( 3254 "Incompatible compilation policy selected", NULL); 3255 } 3256 } 3257 3258 // Set heap size based on available physical memory 3259 set_heap_size(); 3260 3261 #if INCLUDE_ALL_GCS 3262 // Set per-collector flags 3263 if (UseParallelGC || UseParallelOldGC) { 3264 set_parallel_gc_flags(); 3265 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3266 set_cms_and_parnew_gc_flags(); 3267 } else if (UseParNewGC) { // skipped if CMS is set above 3268 set_parnew_gc_flags(); 3269 } else if (UseG1GC) { 3270 set_g1_gc_flags(); 3271 } 3272 check_deprecated_gcs(); 3273 #else // INCLUDE_ALL_GCS 3274 assert(verify_serial_gc_flags(), "SerialGC unset"); 3275 #endif // INCLUDE_ALL_GCS 3276 3277 // Set bytecode rewriting flags 3278 set_bytecode_flags(); 3279 3280 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3281 set_aggressive_opts_flags(); 3282 3283 // Turn off biased locking for locking debug mode flags, 3284 // which are subtlely different from each other but neither works with 3285 // biased locking. 3286 if (UseHeavyMonitors 3287 #ifdef COMPILER1 3288 || !UseFastLocking 3289 #endif // COMPILER1 3290 ) { 3291 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3292 // flag set to true on command line; warn the user that they 3293 // can't enable biased locking here 3294 warning("Biased Locking is not supported with locking debug flags" 3295 "; ignoring UseBiasedLocking flag." ); 3296 } 3297 UseBiasedLocking = false; 3298 } 3299 3300 #ifdef CC_INTERP 3301 // Clear flags not supported by the C++ interpreter 3302 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3303 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3304 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3305 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3306 #endif // CC_INTERP 3307 3308 #ifdef COMPILER2 3309 if (!UseBiasedLocking || EmitSync != 0) { 3310 UseOptoBiasInlining = false; 3311 } 3312 if (!EliminateLocks) { 3313 EliminateNestedLocks = false; 3314 } 3315 if (!Inline) { 3316 IncrementalInline = false; 3317 } 3318 #ifndef PRODUCT 3319 if (!IncrementalInline) { 3320 AlwaysIncrementalInline = false; 3321 } 3322 #endif 3323 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3324 // incremental inlining: bump MaxNodeLimit 3325 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3326 } 3327 #endif 3328 3329 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3330 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3331 DebugNonSafepoints = true; 3332 } 3333 3334 #ifndef PRODUCT 3335 if (CompileTheWorld) { 3336 // Force NmethodSweeper to sweep whole CodeCache each time. 3337 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3338 NmethodSweepFraction = 1; 3339 } 3340 } 3341 #endif 3342 3343 if (PrintCommandLineFlags) { 3344 CommandLineFlags::printSetFlags(tty); 3345 } 3346 3347 // Apply CPU specific policy for the BiasedLocking 3348 if (UseBiasedLocking) { 3349 if (!VM_Version::use_biased_locking() && 3350 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3351 UseBiasedLocking = false; 3352 } 3353 } 3354 3355 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3356 // but only if not already set on the commandline 3357 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3358 bool set = false; 3359 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3360 if (!set) { 3361 FLAG_SET_DEFAULT(PauseAtExit, true); 3362 } 3363 } 3364 3365 return JNI_OK; 3366 } 3367 3368 jint Arguments::adjust_after_os() { 3369 #if INCLUDE_ALL_GCS 3370 if (UseParallelGC || UseParallelOldGC) { 3371 if (UseNUMA) { 3372 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3373 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3374 } 3375 // For those collectors or operating systems (eg, Windows) that do 3376 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3377 UseNUMAInterleaving = true; 3378 } 3379 } 3380 #endif // INCLUDE_ALL_GCS 3381 return JNI_OK; 3382 } 3383 3384 int Arguments::PropertyList_count(SystemProperty* pl) { 3385 int count = 0; 3386 while(pl != NULL) { 3387 count++; 3388 pl = pl->next(); 3389 } 3390 return count; 3391 } 3392 3393 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3394 assert(key != NULL, "just checking"); 3395 SystemProperty* prop; 3396 for (prop = pl; prop != NULL; prop = prop->next()) { 3397 if (strcmp(key, prop->key()) == 0) return prop->value(); 3398 } 3399 return NULL; 3400 } 3401 3402 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3403 int count = 0; 3404 const char* ret_val = NULL; 3405 3406 while(pl != NULL) { 3407 if(count >= index) { 3408 ret_val = pl->key(); 3409 break; 3410 } 3411 count++; 3412 pl = pl->next(); 3413 } 3414 3415 return ret_val; 3416 } 3417 3418 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3419 int count = 0; 3420 char* ret_val = NULL; 3421 3422 while(pl != NULL) { 3423 if(count >= index) { 3424 ret_val = pl->value(); 3425 break; 3426 } 3427 count++; 3428 pl = pl->next(); 3429 } 3430 3431 return ret_val; 3432 } 3433 3434 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3435 SystemProperty* p = *plist; 3436 if (p == NULL) { 3437 *plist = new_p; 3438 } else { 3439 while (p->next() != NULL) { 3440 p = p->next(); 3441 } 3442 p->set_next(new_p); 3443 } 3444 } 3445 3446 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3447 if (plist == NULL) 3448 return; 3449 3450 SystemProperty* new_p = new SystemProperty(k, v, true); 3451 PropertyList_add(plist, new_p); 3452 } 3453 3454 // This add maintains unique property key in the list. 3455 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3456 if (plist == NULL) 3457 return; 3458 3459 // If property key exist then update with new value. 3460 SystemProperty* prop; 3461 for (prop = *plist; prop != NULL; prop = prop->next()) { 3462 if (strcmp(k, prop->key()) == 0) { 3463 if (append) { 3464 prop->append_value(v); 3465 } else { 3466 prop->set_value(v); 3467 } 3468 return; 3469 } 3470 } 3471 3472 PropertyList_add(plist, k, v); 3473 } 3474 3475 #ifdef KERNEL 3476 char *Arguments::get_kernel_properties() { 3477 // Find properties starting with kernel and append them to string 3478 // We need to find out how long they are first because the URL's that they 3479 // might point to could get long. 3480 int length = 0; 3481 SystemProperty* prop; 3482 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3483 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3484 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3485 } 3486 } 3487 // Add one for null terminator. 3488 char *props = AllocateHeap(length + 1, mtInternal); 3489 if (length != 0) { 3490 int pos = 0; 3491 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3492 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3493 jio_snprintf(&props[pos], length-pos, 3494 "-D%s=%s ", prop->key(), prop->value()); 3495 pos = strlen(props); 3496 } 3497 } 3498 } 3499 // null terminate props in case of null 3500 props[length] = '\0'; 3501 return props; 3502 } 3503 #endif // KERNEL 3504 3505 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3506 // Returns true if all of the source pointed by src has been copied over to 3507 // the destination buffer pointed by buf. Otherwise, returns false. 3508 // Notes: 3509 // 1. If the length (buflen) of the destination buffer excluding the 3510 // NULL terminator character is not long enough for holding the expanded 3511 // pid characters, it also returns false instead of returning the partially 3512 // expanded one. 3513 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3514 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3515 char* buf, size_t buflen) { 3516 const char* p = src; 3517 char* b = buf; 3518 const char* src_end = &src[srclen]; 3519 char* buf_end = &buf[buflen - 1]; 3520 3521 while (p < src_end && b < buf_end) { 3522 if (*p == '%') { 3523 switch (*(++p)) { 3524 case '%': // "%%" ==> "%" 3525 *b++ = *p++; 3526 break; 3527 case 'p': { // "%p" ==> current process id 3528 // buf_end points to the character before the last character so 3529 // that we could write '\0' to the end of the buffer. 3530 size_t buf_sz = buf_end - b + 1; 3531 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3532 3533 // if jio_snprintf fails or the buffer is not long enough to hold 3534 // the expanded pid, returns false. 3535 if (ret < 0 || ret >= (int)buf_sz) { 3536 return false; 3537 } else { 3538 b += ret; 3539 assert(*b == '\0', "fail in copy_expand_pid"); 3540 if (p == src_end && b == buf_end + 1) { 3541 // reach the end of the buffer. 3542 return true; 3543 } 3544 } 3545 p++; 3546 break; 3547 } 3548 default : 3549 *b++ = '%'; 3550 } 3551 } else { 3552 *b++ = *p++; 3553 } 3554 } 3555 *b = '\0'; 3556 return (p == src_end); // return false if not all of the source was copied 3557 }