1 /* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "compiler/compilerOracle.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/cardTableRS.hpp" 31 #include "memory/referenceProcessor.hpp" 32 #include "memory/universe.inline.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "prims/jvmtiExport.hpp" 35 #include "runtime/arguments.hpp" 36 #include "runtime/globals_extension.hpp" 37 #include "runtime/java.hpp" 38 #include "services/management.hpp" 39 #include "services/memTracker.hpp" 40 #include "utilities/defaultStream.hpp" 41 #include "utilities/taskqueue.hpp" 42 #ifdef TARGET_OS_FAMILY_linux 43 # include "os_linux.inline.hpp" 44 #endif 45 #ifdef TARGET_OS_FAMILY_solaris 46 # include "os_solaris.inline.hpp" 47 #endif 48 #ifdef TARGET_OS_FAMILY_windows 49 # include "os_windows.inline.hpp" 50 #endif 51 #ifdef TARGET_OS_FAMILY_bsd 52 # include "os_bsd.inline.hpp" 53 #endif 54 #ifndef SERIALGC 55 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 56 #endif 57 58 // Note: This is a special bug reporting site for the JVM 59 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 60 #define DEFAULT_JAVA_LAUNCHER "generic" 61 62 char** Arguments::_jvm_flags_array = NULL; 63 int Arguments::_num_jvm_flags = 0; 64 char** Arguments::_jvm_args_array = NULL; 65 int Arguments::_num_jvm_args = 0; 66 char* Arguments::_java_command = NULL; 67 SystemProperty* Arguments::_system_properties = NULL; 68 const char* Arguments::_gc_log_filename = NULL; 69 bool Arguments::_has_profile = false; 70 bool Arguments::_has_alloc_profile = false; 71 uintx Arguments::_min_heap_size = 0; 72 Arguments::Mode Arguments::_mode = _mixed; 73 bool Arguments::_java_compiler = false; 74 bool Arguments::_xdebug_mode = false; 75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 77 int Arguments::_sun_java_launcher_pid = -1; 78 bool Arguments::_created_by_gamma_launcher = false; 79 80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 83 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 84 bool Arguments::_ClipInlining = ClipInlining; 85 86 char* Arguments::SharedArchivePath = NULL; 87 88 AgentLibraryList Arguments::_libraryList; 89 AgentLibraryList Arguments::_agentList; 90 91 abort_hook_t Arguments::_abort_hook = NULL; 92 exit_hook_t Arguments::_exit_hook = NULL; 93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 94 95 96 SystemProperty *Arguments::_java_ext_dirs = NULL; 97 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 98 SystemProperty *Arguments::_sun_boot_library_path = NULL; 99 SystemProperty *Arguments::_java_library_path = NULL; 100 SystemProperty *Arguments::_java_home = NULL; 101 SystemProperty *Arguments::_java_class_path = NULL; 102 SystemProperty *Arguments::_sun_boot_class_path = NULL; 103 104 char* Arguments::_meta_index_path = NULL; 105 char* Arguments::_meta_index_dir = NULL; 106 107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 108 109 static bool match_option(const JavaVMOption *option, const char* name, 110 const char** tail) { 111 int len = (int)strlen(name); 112 if (strncmp(option->optionString, name, len) == 0) { 113 *tail = option->optionString + len; 114 return true; 115 } else { 116 return false; 117 } 118 } 119 120 static void logOption(const char* opt) { 121 if (PrintVMOptions) { 122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 123 } 124 } 125 126 // Process java launcher properties. 127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 128 // See if sun.java.launcher or sun.java.launcher.pid is defined. 129 // Must do this before setting up other system properties, 130 // as some of them may depend on launcher type. 131 for (int index = 0; index < args->nOptions; index++) { 132 const JavaVMOption* option = args->options + index; 133 const char* tail; 134 135 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 136 process_java_launcher_argument(tail, option->extraInfo); 137 continue; 138 } 139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 140 _sun_java_launcher_pid = atoi(tail); 141 continue; 142 } 143 } 144 } 145 146 // Initialize system properties key and value. 147 void Arguments::init_system_properties() { 148 149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 150 "Java Virtual Machine Specification", false)); 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 154 155 // following are JVMTI agent writeable properties. 156 // Properties values are set to NULL and they are 157 // os specific they are initialized in os::init_system_properties_values(). 158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 161 _java_library_path = new SystemProperty("java.library.path", NULL, true); 162 _java_home = new SystemProperty("java.home", NULL, true); 163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 164 165 _java_class_path = new SystemProperty("java.class.path", "", true); 166 167 // Add to System Property list. 168 PropertyList_add(&_system_properties, _java_ext_dirs); 169 PropertyList_add(&_system_properties, _java_endorsed_dirs); 170 PropertyList_add(&_system_properties, _sun_boot_library_path); 171 PropertyList_add(&_system_properties, _java_library_path); 172 PropertyList_add(&_system_properties, _java_home); 173 PropertyList_add(&_system_properties, _java_class_path); 174 PropertyList_add(&_system_properties, _sun_boot_class_path); 175 176 // Set OS specific system properties values 177 os::init_system_properties_values(); 178 } 179 180 181 // Update/Initialize System properties after JDK version number is known 182 void Arguments::init_version_specific_system_properties() { 183 enum { bufsz = 16 }; 184 char buffer[bufsz]; 185 const char* spec_vendor = "Sun Microsystems Inc."; 186 uint32_t spec_version = 0; 187 188 if (JDK_Version::is_gte_jdk17x_version()) { 189 spec_vendor = "Oracle Corporation"; 190 spec_version = JDK_Version::current().major_version(); 191 } 192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 193 194 PropertyList_add(&_system_properties, 195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 196 PropertyList_add(&_system_properties, 197 new SystemProperty("java.vm.specification.version", buffer, false)); 198 PropertyList_add(&_system_properties, 199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 200 } 201 202 /** 203 * Provide a slightly more user-friendly way of eliminating -XX flags. 204 * When a flag is eliminated, it can be added to this list in order to 205 * continue accepting this flag on the command-line, while issuing a warning 206 * and ignoring the value. Once the JDK version reaches the 'accept_until' 207 * limit, we flatly refuse to admit the existence of the flag. This allows 208 * a flag to die correctly over JDK releases using HSX. 209 */ 210 typedef struct { 211 const char* name; 212 JDK_Version obsoleted_in; // when the flag went away 213 JDK_Version accept_until; // which version to start denying the existence 214 } ObsoleteFlag; 215 216 static ObsoleteFlag obsolete_jvm_flags[] = { 217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 232 { "DefaultInitialRAMFraction", 233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 234 { "UseDepthFirstScavengeOrder", 235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 236 { "HandlePromotionFailure", 237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 238 { "MaxLiveObjectEvacuationRatio", 239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 241 { "UseParallelOldGCCompacting", 242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 243 { "UseParallelDensePrefixUpdate", 244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 245 { "UseParallelOldGCDensePrefix", 246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 262 #ifdef PRODUCT 263 { "DesiredMethodLimit", 264 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 265 #endif // PRODUCT 266 { NULL, JDK_Version(0), JDK_Version(0) } 267 }; 268 269 // Returns true if the flag is obsolete and fits into the range specified 270 // for being ignored. In the case that the flag is ignored, the 'version' 271 // value is filled in with the version number when the flag became 272 // obsolete so that that value can be displayed to the user. 273 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 274 int i = 0; 275 assert(version != NULL, "Must provide a version buffer"); 276 while (obsolete_jvm_flags[i].name != NULL) { 277 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 278 // <flag>=xxx form 279 // [-|+]<flag> form 280 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 281 ((s[0] == '+' || s[0] == '-') && 282 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 283 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 284 *version = flag_status.obsoleted_in; 285 return true; 286 } 287 } 288 i++; 289 } 290 return false; 291 } 292 293 // Constructs the system class path (aka boot class path) from the following 294 // components, in order: 295 // 296 // prefix // from -Xbootclasspath/p:... 297 // endorsed // the expansion of -Djava.endorsed.dirs=... 298 // base // from os::get_system_properties() or -Xbootclasspath= 299 // suffix // from -Xbootclasspath/a:... 300 // 301 // java.endorsed.dirs is a list of directories; any jar or zip files in the 302 // directories are added to the sysclasspath just before the base. 303 // 304 // This could be AllStatic, but it isn't needed after argument processing is 305 // complete. 306 class SysClassPath: public StackObj { 307 public: 308 SysClassPath(const char* base); 309 ~SysClassPath(); 310 311 inline void set_base(const char* base); 312 inline void add_prefix(const char* prefix); 313 inline void add_suffix_to_prefix(const char* suffix); 314 inline void add_suffix(const char* suffix); 315 inline void reset_path(const char* base); 316 317 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 318 // property. Must be called after all command-line arguments have been 319 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 320 // combined_path(). 321 void expand_endorsed(); 322 323 inline const char* get_base() const { return _items[_scp_base]; } 324 inline const char* get_prefix() const { return _items[_scp_prefix]; } 325 inline const char* get_suffix() const { return _items[_scp_suffix]; } 326 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 327 328 // Combine all the components into a single c-heap-allocated string; caller 329 // must free the string if/when no longer needed. 330 char* combined_path(); 331 332 private: 333 // Utility routines. 334 static char* add_to_path(const char* path, const char* str, bool prepend); 335 static char* add_jars_to_path(char* path, const char* directory); 336 337 inline void reset_item_at(int index); 338 339 // Array indices for the items that make up the sysclasspath. All except the 340 // base are allocated in the C heap and freed by this class. 341 enum { 342 _scp_prefix, // from -Xbootclasspath/p:... 343 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 344 _scp_base, // the default sysclasspath 345 _scp_suffix, // from -Xbootclasspath/a:... 346 _scp_nitems // the number of items, must be last. 347 }; 348 349 const char* _items[_scp_nitems]; 350 DEBUG_ONLY(bool _expansion_done;) 351 }; 352 353 SysClassPath::SysClassPath(const char* base) { 354 memset(_items, 0, sizeof(_items)); 355 _items[_scp_base] = base; 356 DEBUG_ONLY(_expansion_done = false;) 357 } 358 359 SysClassPath::~SysClassPath() { 360 // Free everything except the base. 361 for (int i = 0; i < _scp_nitems; ++i) { 362 if (i != _scp_base) reset_item_at(i); 363 } 364 DEBUG_ONLY(_expansion_done = false;) 365 } 366 367 inline void SysClassPath::set_base(const char* base) { 368 _items[_scp_base] = base; 369 } 370 371 inline void SysClassPath::add_prefix(const char* prefix) { 372 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 373 } 374 375 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 376 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 377 } 378 379 inline void SysClassPath::add_suffix(const char* suffix) { 380 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 381 } 382 383 inline void SysClassPath::reset_item_at(int index) { 384 assert(index < _scp_nitems && index != _scp_base, "just checking"); 385 if (_items[index] != NULL) { 386 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 387 _items[index] = NULL; 388 } 389 } 390 391 inline void SysClassPath::reset_path(const char* base) { 392 // Clear the prefix and suffix. 393 reset_item_at(_scp_prefix); 394 reset_item_at(_scp_suffix); 395 set_base(base); 396 } 397 398 //------------------------------------------------------------------------------ 399 400 void SysClassPath::expand_endorsed() { 401 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 402 403 const char* path = Arguments::get_property("java.endorsed.dirs"); 404 if (path == NULL) { 405 path = Arguments::get_endorsed_dir(); 406 assert(path != NULL, "no default for java.endorsed.dirs"); 407 } 408 409 char* expanded_path = NULL; 410 const char separator = *os::path_separator(); 411 const char* const end = path + strlen(path); 412 while (path < end) { 413 const char* tmp_end = strchr(path, separator); 414 if (tmp_end == NULL) { 415 expanded_path = add_jars_to_path(expanded_path, path); 416 path = end; 417 } else { 418 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 419 memcpy(dirpath, path, tmp_end - path); 420 dirpath[tmp_end - path] = '\0'; 421 expanded_path = add_jars_to_path(expanded_path, dirpath); 422 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 423 path = tmp_end + 1; 424 } 425 } 426 _items[_scp_endorsed] = expanded_path; 427 DEBUG_ONLY(_expansion_done = true;) 428 } 429 430 // Combine the bootclasspath elements, some of which may be null, into a single 431 // c-heap-allocated string. 432 char* SysClassPath::combined_path() { 433 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 434 assert(_expansion_done, "must call expand_endorsed() first."); 435 436 size_t lengths[_scp_nitems]; 437 size_t total_len = 0; 438 439 const char separator = *os::path_separator(); 440 441 // Get the lengths. 442 int i; 443 for (i = 0; i < _scp_nitems; ++i) { 444 if (_items[i] != NULL) { 445 lengths[i] = strlen(_items[i]); 446 // Include space for the separator char (or a NULL for the last item). 447 total_len += lengths[i] + 1; 448 } 449 } 450 assert(total_len > 0, "empty sysclasspath not allowed"); 451 452 // Copy the _items to a single string. 453 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 454 char* cp_tmp = cp; 455 for (i = 0; i < _scp_nitems; ++i) { 456 if (_items[i] != NULL) { 457 memcpy(cp_tmp, _items[i], lengths[i]); 458 cp_tmp += lengths[i]; 459 *cp_tmp++ = separator; 460 } 461 } 462 *--cp_tmp = '\0'; // Replace the extra separator. 463 return cp; 464 } 465 466 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 467 char* 468 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 469 char *cp; 470 471 assert(str != NULL, "just checking"); 472 if (path == NULL) { 473 size_t len = strlen(str) + 1; 474 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 475 memcpy(cp, str, len); // copy the trailing null 476 } else { 477 const char separator = *os::path_separator(); 478 size_t old_len = strlen(path); 479 size_t str_len = strlen(str); 480 size_t len = old_len + str_len + 2; 481 482 if (prepend) { 483 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 484 char* cp_tmp = cp; 485 memcpy(cp_tmp, str, str_len); 486 cp_tmp += str_len; 487 *cp_tmp = separator; 488 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 489 FREE_C_HEAP_ARRAY(char, path, mtInternal); 490 } else { 491 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 492 char* cp_tmp = cp + old_len; 493 *cp_tmp = separator; 494 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 495 } 496 } 497 return cp; 498 } 499 500 // Scan the directory and append any jar or zip files found to path. 501 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 502 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 503 DIR* dir = os::opendir(directory); 504 if (dir == NULL) return path; 505 506 char dir_sep[2] = { '\0', '\0' }; 507 size_t directory_len = strlen(directory); 508 const char fileSep = *os::file_separator(); 509 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 510 511 /* Scan the directory for jars/zips, appending them to path. */ 512 struct dirent *entry; 513 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 514 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 515 const char* name = entry->d_name; 516 const char* ext = name + strlen(name) - 4; 517 bool isJarOrZip = ext > name && 518 (os::file_name_strcmp(ext, ".jar") == 0 || 519 os::file_name_strcmp(ext, ".zip") == 0); 520 if (isJarOrZip) { 521 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 522 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 523 path = add_to_path(path, jarpath, false); 524 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 525 } 526 } 527 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 528 os::closedir(dir); 529 return path; 530 } 531 532 // Parses a memory size specification string. 533 static bool atomull(const char *s, julong* result) { 534 julong n = 0; 535 int args_read = sscanf(s, os::julong_format_specifier(), &n); 536 if (args_read != 1) { 537 return false; 538 } 539 while (*s != '\0' && isdigit(*s)) { 540 s++; 541 } 542 // 4705540: illegal if more characters are found after the first non-digit 543 if (strlen(s) > 1) { 544 return false; 545 } 546 switch (*s) { 547 case 'T': case 't': 548 *result = n * G * K; 549 // Check for overflow. 550 if (*result/((julong)G * K) != n) return false; 551 return true; 552 case 'G': case 'g': 553 *result = n * G; 554 if (*result/G != n) return false; 555 return true; 556 case 'M': case 'm': 557 *result = n * M; 558 if (*result/M != n) return false; 559 return true; 560 case 'K': case 'k': 561 *result = n * K; 562 if (*result/K != n) return false; 563 return true; 564 case '\0': 565 *result = n; 566 return true; 567 default: 568 return false; 569 } 570 } 571 572 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 573 if (size < min_size) return arg_too_small; 574 // Check that size will fit in a size_t (only relevant on 32-bit) 575 if (size > max_uintx) return arg_too_big; 576 return arg_in_range; 577 } 578 579 // Describe an argument out of range error 580 void Arguments::describe_range_error(ArgsRange errcode) { 581 switch(errcode) { 582 case arg_too_big: 583 jio_fprintf(defaultStream::error_stream(), 584 "The specified size exceeds the maximum " 585 "representable size.\n"); 586 break; 587 case arg_too_small: 588 case arg_unreadable: 589 case arg_in_range: 590 // do nothing for now 591 break; 592 default: 593 ShouldNotReachHere(); 594 } 595 } 596 597 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 598 return CommandLineFlags::boolAtPut(name, &value, origin); 599 } 600 601 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 602 double v; 603 if (sscanf(value, "%lf", &v) != 1) { 604 return false; 605 } 606 607 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 608 return true; 609 } 610 return false; 611 } 612 613 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 614 julong v; 615 intx intx_v; 616 bool is_neg = false; 617 // Check the sign first since atomull() parses only unsigned values. 618 if (*value == '-') { 619 if (!CommandLineFlags::intxAt(name, &intx_v)) { 620 return false; 621 } 622 value++; 623 is_neg = true; 624 } 625 if (!atomull(value, &v)) { 626 return false; 627 } 628 intx_v = (intx) v; 629 if (is_neg) { 630 intx_v = -intx_v; 631 } 632 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 633 return true; 634 } 635 uintx uintx_v = (uintx) v; 636 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 637 return true; 638 } 639 uint64_t uint64_t_v = (uint64_t) v; 640 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 641 return true; 642 } 643 return false; 644 } 645 646 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 647 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 648 // Contract: CommandLineFlags always returns a pointer that needs freeing. 649 FREE_C_HEAP_ARRAY(char, value, mtInternal); 650 return true; 651 } 652 653 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 654 const char* old_value = ""; 655 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 656 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 657 size_t new_len = strlen(new_value); 658 const char* value; 659 char* free_this_too = NULL; 660 if (old_len == 0) { 661 value = new_value; 662 } else if (new_len == 0) { 663 value = old_value; 664 } else { 665 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 666 // each new setting adds another LINE to the switch: 667 sprintf(buf, "%s\n%s", old_value, new_value); 668 value = buf; 669 free_this_too = buf; 670 } 671 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 672 // CommandLineFlags always returns a pointer that needs freeing. 673 FREE_C_HEAP_ARRAY(char, value, mtInternal); 674 if (free_this_too != NULL) { 675 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 676 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 677 } 678 return true; 679 } 680 681 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 682 683 // range of acceptable characters spelled out for portability reasons 684 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 685 #define BUFLEN 255 686 char name[BUFLEN+1]; 687 char dummy; 688 689 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 690 return set_bool_flag(name, false, origin); 691 } 692 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 693 return set_bool_flag(name, true, origin); 694 } 695 696 char punct; 697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 698 const char* value = strchr(arg, '=') + 1; 699 Flag* flag = Flag::find_flag(name, strlen(name)); 700 if (flag != NULL && flag->is_ccstr()) { 701 if (flag->ccstr_accumulates()) { 702 return append_to_string_flag(name, value, origin); 703 } else { 704 if (value[0] == '\0') { 705 value = NULL; 706 } 707 return set_string_flag(name, value, origin); 708 } 709 } 710 } 711 712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 713 const char* value = strchr(arg, '=') + 1; 714 // -XX:Foo:=xxx will reset the string flag to the given value. 715 if (value[0] == '\0') { 716 value = NULL; 717 } 718 return set_string_flag(name, value, origin); 719 } 720 721 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 722 #define SIGNED_NUMBER_RANGE "[-0123456789]" 723 #define NUMBER_RANGE "[0123456789]" 724 char value[BUFLEN + 1]; 725 char value2[BUFLEN + 1]; 726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 727 // Looks like a floating-point number -- try again with more lenient format string 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 729 return set_fp_numeric_flag(name, value, origin); 730 } 731 } 732 733 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 734 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 735 return set_numeric_flag(name, value, origin); 736 } 737 738 return false; 739 } 740 741 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 742 assert(bldarray != NULL, "illegal argument"); 743 744 if (arg == NULL) { 745 return; 746 } 747 748 int index = *count; 749 750 // expand the array and add arg to the last element 751 (*count)++; 752 if (*bldarray == NULL) { 753 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal); 754 } else { 755 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal); 756 } 757 (*bldarray)[index] = strdup(arg); 758 } 759 760 void Arguments::build_jvm_args(const char* arg) { 761 add_string(&_jvm_args_array, &_num_jvm_args, arg); 762 } 763 764 void Arguments::build_jvm_flags(const char* arg) { 765 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 766 } 767 768 // utility function to return a string that concatenates all 769 // strings in a given char** array 770 const char* Arguments::build_resource_string(char** args, int count) { 771 if (args == NULL || count == 0) { 772 return NULL; 773 } 774 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 775 for (int i = 1; i < count; i++) { 776 length += strlen(args[i]) + 1; // add 1 for a space 777 } 778 char* s = NEW_RESOURCE_ARRAY(char, length); 779 strcpy(s, args[0]); 780 for (int j = 1; j < count; j++) { 781 strcat(s, " "); 782 strcat(s, args[j]); 783 } 784 return (const char*) s; 785 } 786 787 void Arguments::print_on(outputStream* st) { 788 st->print_cr("VM Arguments:"); 789 if (num_jvm_flags() > 0) { 790 st->print("jvm_flags: "); print_jvm_flags_on(st); 791 } 792 if (num_jvm_args() > 0) { 793 st->print("jvm_args: "); print_jvm_args_on(st); 794 } 795 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 796 if (_java_class_path != NULL) { 797 char* path = _java_class_path->value(); 798 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 799 } 800 st->print_cr("Launcher Type: %s", _sun_java_launcher); 801 } 802 803 void Arguments::print_jvm_flags_on(outputStream* st) { 804 if (_num_jvm_flags > 0) { 805 for (int i=0; i < _num_jvm_flags; i++) { 806 st->print("%s ", _jvm_flags_array[i]); 807 } 808 st->print_cr(""); 809 } 810 } 811 812 void Arguments::print_jvm_args_on(outputStream* st) { 813 if (_num_jvm_args > 0) { 814 for (int i=0; i < _num_jvm_args; i++) { 815 st->print("%s ", _jvm_args_array[i]); 816 } 817 st->print_cr(""); 818 } 819 } 820 821 bool Arguments::process_argument(const char* arg, 822 jboolean ignore_unrecognized, FlagValueOrigin origin) { 823 824 JDK_Version since = JDK_Version(); 825 826 if (parse_argument(arg, origin) || ignore_unrecognized) { 827 return true; 828 } 829 830 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg; 831 if (is_newly_obsolete(arg, &since)) { 832 char version[256]; 833 since.to_string(version, sizeof(version)); 834 warning("ignoring option %s; support was removed in %s", argname, version); 835 return true; 836 } 837 838 // For locked flags, report a custom error message if available. 839 // Otherwise, report the standard unrecognized VM option. 840 841 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true); 842 if (locked_flag != NULL) { 843 char locked_message_buf[BUFLEN]; 844 locked_flag->get_locked_message(locked_message_buf, BUFLEN); 845 if (strlen(locked_message_buf) == 0) { 846 jio_fprintf(defaultStream::error_stream(), 847 "Unrecognized VM option '%s'\n", argname); 848 } else { 849 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 850 } 851 } else { 852 jio_fprintf(defaultStream::error_stream(), 853 "Unrecognized VM option '%s'\n", argname); 854 } 855 856 // allow for commandline "commenting out" options like -XX:#+Verbose 857 return arg[0] == '#'; 858 } 859 860 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 861 FILE* stream = fopen(file_name, "rb"); 862 if (stream == NULL) { 863 if (should_exist) { 864 jio_fprintf(defaultStream::error_stream(), 865 "Could not open settings file %s\n", file_name); 866 return false; 867 } else { 868 return true; 869 } 870 } 871 872 char token[1024]; 873 int pos = 0; 874 875 bool in_white_space = true; 876 bool in_comment = false; 877 bool in_quote = false; 878 char quote_c = 0; 879 bool result = true; 880 881 int c = getc(stream); 882 while(c != EOF && pos < (int)(sizeof(token)-1)) { 883 if (in_white_space) { 884 if (in_comment) { 885 if (c == '\n') in_comment = false; 886 } else { 887 if (c == '#') in_comment = true; 888 else if (!isspace(c)) { 889 in_white_space = false; 890 token[pos++] = c; 891 } 892 } 893 } else { 894 if (c == '\n' || (!in_quote && isspace(c))) { 895 // token ends at newline, or at unquoted whitespace 896 // this allows a way to include spaces in string-valued options 897 token[pos] = '\0'; 898 logOption(token); 899 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 900 build_jvm_flags(token); 901 pos = 0; 902 in_white_space = true; 903 in_quote = false; 904 } else if (!in_quote && (c == '\'' || c == '"')) { 905 in_quote = true; 906 quote_c = c; 907 } else if (in_quote && (c == quote_c)) { 908 in_quote = false; 909 } else { 910 token[pos++] = c; 911 } 912 } 913 c = getc(stream); 914 } 915 if (pos > 0) { 916 token[pos] = '\0'; 917 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 918 build_jvm_flags(token); 919 } 920 fclose(stream); 921 return result; 922 } 923 924 //============================================================================================================= 925 // Parsing of properties (-D) 926 927 const char* Arguments::get_property(const char* key) { 928 return PropertyList_get_value(system_properties(), key); 929 } 930 931 bool Arguments::add_property(const char* prop) { 932 const char* eq = strchr(prop, '='); 933 char* key; 934 // ns must be static--its address may be stored in a SystemProperty object. 935 const static char ns[1] = {0}; 936 char* value = (char *)ns; 937 938 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 939 key = AllocateHeap(key_len + 1, mtInternal); 940 strncpy(key, prop, key_len); 941 key[key_len] = '\0'; 942 943 if (eq != NULL) { 944 size_t value_len = strlen(prop) - key_len - 1; 945 value = AllocateHeap(value_len + 1, mtInternal); 946 strncpy(value, &prop[key_len + 1], value_len + 1); 947 } 948 949 if (strcmp(key, "java.compiler") == 0) { 950 process_java_compiler_argument(value); 951 FreeHeap(key); 952 if (eq != NULL) { 953 FreeHeap(value); 954 } 955 return true; 956 } else if (strcmp(key, "sun.java.command") == 0) { 957 _java_command = value; 958 959 // Record value in Arguments, but let it get passed to Java. 960 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 961 // launcher.pid property is private and is processed 962 // in process_sun_java_launcher_properties(); 963 // the sun.java.launcher property is passed on to the java application 964 FreeHeap(key); 965 if (eq != NULL) { 966 FreeHeap(value); 967 } 968 return true; 969 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 970 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 971 // its value without going through the property list or making a Java call. 972 _java_vendor_url_bug = value; 973 } else if (strcmp(key, "sun.boot.library.path") == 0) { 974 PropertyList_unique_add(&_system_properties, key, value, true); 975 return true; 976 } 977 // Create new property and add at the end of the list 978 PropertyList_unique_add(&_system_properties, key, value); 979 return true; 980 } 981 982 //=========================================================================================================== 983 // Setting int/mixed/comp mode flags 984 985 void Arguments::set_mode_flags(Mode mode) { 986 // Set up default values for all flags. 987 // If you add a flag to any of the branches below, 988 // add a default value for it here. 989 set_java_compiler(false); 990 _mode = mode; 991 992 // Ensure Agent_OnLoad has the correct initial values. 993 // This may not be the final mode; mode may change later in onload phase. 994 PropertyList_unique_add(&_system_properties, "java.vm.info", 995 (char*)VM_Version::vm_info_string(), false); 996 997 UseInterpreter = true; 998 UseCompiler = true; 999 UseLoopCounter = true; 1000 1001 #ifndef ZERO 1002 // Turn these off for mixed and comp. Leave them on for Zero. 1003 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1004 UseFastAccessorMethods = (mode == _int); 1005 } 1006 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1007 UseFastEmptyMethods = (mode == _int); 1008 } 1009 #endif 1010 1011 // Default values may be platform/compiler dependent - 1012 // use the saved values 1013 ClipInlining = Arguments::_ClipInlining; 1014 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1015 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1016 BackgroundCompilation = Arguments::_BackgroundCompilation; 1017 1018 // Change from defaults based on mode 1019 switch (mode) { 1020 default: 1021 ShouldNotReachHere(); 1022 break; 1023 case _int: 1024 UseCompiler = false; 1025 UseLoopCounter = false; 1026 AlwaysCompileLoopMethods = false; 1027 UseOnStackReplacement = false; 1028 break; 1029 case _mixed: 1030 // same as default 1031 break; 1032 case _comp: 1033 UseInterpreter = false; 1034 BackgroundCompilation = false; 1035 ClipInlining = false; 1036 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1037 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1038 // compile a level 4 (C2) and then continue executing it. 1039 if (TieredCompilation) { 1040 Tier3InvokeNotifyFreqLog = 0; 1041 Tier4InvocationThreshold = 0; 1042 } 1043 break; 1044 } 1045 } 1046 1047 // Conflict: required to use shared spaces (-Xshare:on), but 1048 // incompatible command line options were chosen. 1049 1050 static void no_shared_spaces() { 1051 if (RequireSharedSpaces) { 1052 jio_fprintf(defaultStream::error_stream(), 1053 "Class data sharing is inconsistent with other specified options.\n"); 1054 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1055 } else { 1056 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1057 } 1058 } 1059 1060 void Arguments::set_tiered_flags() { 1061 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1062 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1063 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1064 } 1065 if (CompilationPolicyChoice < 2) { 1066 vm_exit_during_initialization( 1067 "Incompatible compilation policy selected", NULL); 1068 } 1069 // Increase the code cache size - tiered compiles a lot more. 1070 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1071 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1072 } 1073 } 1074 1075 #if INCLUDE_ALTERNATE_GCS 1076 static void disable_adaptive_size_policy(const char* collector_name) { 1077 if (UseAdaptiveSizePolicy) { 1078 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1079 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1080 collector_name); 1081 } 1082 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1083 } 1084 } 1085 1086 void Arguments::set_parnew_gc_flags() { 1087 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1088 "control point invariant"); 1089 assert(UseParNewGC, "Error"); 1090 1091 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1092 disable_adaptive_size_policy("UseParNewGC"); 1093 1094 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1095 assert(ParallelGCThreads == 0, "Default value for ParallelGCThreads should be 0"); 1096 uint par_gc_threads = Abstract_VM_Version::parallel_worker_threads(); 1097 if (par_gc_threads > 1) { 1098 FLAG_SET_DEFAULT(ParallelGCThreads, par_gc_threads); 1099 } 1100 } 1101 1102 if (UseParNewGC) { 1103 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1104 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1105 // we set them to 1024 and 1024. 1106 // See CR 6362902. 1107 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1108 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1109 } 1110 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1111 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1112 } 1113 1114 // AlwaysTenure flag should make ParNew promote all at first collection. 1115 // See CR 6362902. 1116 if (AlwaysTenure) { 1117 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1118 } 1119 // When using compressed oops, we use local overflow stacks, 1120 // rather than using a global overflow list chained through 1121 // the klass word of the object's pre-image. 1122 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1123 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1124 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1125 } 1126 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1127 } 1128 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1129 } 1130 } 1131 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_ALTERNATE_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_ALTERNATE_GCS 1306 // Set CMS global values 1307 CompactibleFreeListSpace::set_cms_values(); 1308 #endif // INCLUDE_ALTERNATE_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 then 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 then 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 if (UseParallelGC) { 1459 FLAG_SET_DEFAULT(ParallelGCThreads, 1460 Abstract_VM_Version::parallel_worker_threads()); 1461 1462 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1463 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1464 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1465 // See CR 6362902 for details. 1466 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1467 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1468 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1469 } 1470 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1471 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1472 } 1473 } 1474 1475 if (UseParallelOldGC) { 1476 // Par compact uses lower default values since they are treated as 1477 // minimums. These are different defaults because of the different 1478 // interpretation and are not ergonomically set. 1479 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1480 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1481 } 1482 } 1483 } 1484 } 1485 1486 void Arguments::set_g1_gc_flags() { 1487 assert(UseG1GC, "Error"); 1488 #ifdef COMPILER1 1489 FastTLABRefill = false; 1490 #endif 1491 FLAG_SET_DEFAULT(ParallelGCThreads, 1492 Abstract_VM_Version::parallel_worker_threads()); 1493 if (ParallelGCThreads == 0) { 1494 FLAG_SET_DEFAULT(ParallelGCThreads, 1495 Abstract_VM_Version::parallel_worker_threads()); 1496 } 1497 1498 // MarkStackSize will be set (if it hasn't been set by the user) 1499 // when concurrent marking is initialized. 1500 // Its value will be based upon the number of parallel marking threads. 1501 // But we do set the maximum mark stack size here. 1502 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1503 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1504 } 1505 1506 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1507 // In G1, we want the default GC overhead goal to be higher than 1508 // say in PS. So we set it here to 10%. Otherwise the heap might 1509 // be expanded more aggressively than we would like it to. In 1510 // fact, even 10% seems to not be high enough in some cases 1511 // (especially small GC stress tests that the main thing they do 1512 // is allocation). We might consider increase it further. 1513 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1514 } 1515 1516 if (PrintGCDetails && Verbose) { 1517 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1518 MarkStackSize / K, MarkStackSizeMax / K); 1519 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1520 } 1521 } 1522 1523 void Arguments::set_heap_size() { 1524 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1525 // Deprecated flag 1526 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1527 } 1528 1529 const julong phys_mem = 1530 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1531 : (julong)MaxRAM; 1532 1533 // If the maximum heap size has not been set with -Xmx, 1534 // then set it as fraction of the size of physical memory, 1535 // respecting the maximum and minimum sizes of the heap. 1536 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1537 julong reasonable_max = phys_mem / MaxRAMFraction; 1538 1539 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1540 // Small physical memory, so use a minimum fraction of it for the heap 1541 reasonable_max = phys_mem / MinRAMFraction; 1542 } else { 1543 // Not-small physical memory, so require a heap at least 1544 // as large as MaxHeapSize 1545 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1546 } 1547 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1548 // Limit the heap size to ErgoHeapSizeLimit 1549 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1550 } 1551 if (UseCompressedOops) { 1552 // Limit the heap size to the maximum possible when using compressed oops 1553 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1554 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1555 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1556 // but it should be not less than default MaxHeapSize. 1557 max_coop_heap -= HeapBaseMinAddress; 1558 } 1559 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1560 } 1561 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1562 1563 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1564 // An initial heap size was specified on the command line, 1565 // so be sure that the maximum size is consistent. Done 1566 // after call to allocatable_physical_memory because that 1567 // method might reduce the allocation size. 1568 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1569 } 1570 1571 if (PrintGCDetails && Verbose) { 1572 // Cannot use gclog_or_tty yet. 1573 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1574 } 1575 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1576 } 1577 1578 // If the initial_heap_size has not been set with InitialHeapSize 1579 // or -Xms, then set it as fraction of the size of physical memory, 1580 // respecting the maximum and minimum sizes of the heap. 1581 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1582 julong reasonable_minimum = (julong)(OldSize + NewSize); 1583 1584 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1585 1586 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1587 1588 julong reasonable_initial = phys_mem / InitialRAMFraction; 1589 1590 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1591 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1592 1593 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1594 1595 if (PrintGCDetails && Verbose) { 1596 // Cannot use gclog_or_tty yet. 1597 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1598 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1599 } 1600 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1601 set_min_heap_size((uintx)reasonable_minimum); 1602 } 1603 } 1604 1605 // This must be called after ergonomics because we want bytecode rewriting 1606 // if the server compiler is used, or if UseSharedSpaces is disabled. 1607 void Arguments::set_bytecode_flags() { 1608 // Better not attempt to store into a read-only space. 1609 if (UseSharedSpaces) { 1610 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1611 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1612 } 1613 1614 if (!RewriteBytecodes) { 1615 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1616 } 1617 } 1618 1619 // Aggressive optimization flags -XX:+AggressiveOpts 1620 void Arguments::set_aggressive_opts_flags() { 1621 #ifdef COMPILER2 1622 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1623 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1624 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1625 } 1626 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1627 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1628 } 1629 1630 // Feed the cache size setting into the JDK 1631 char buffer[1024]; 1632 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1633 add_property(buffer); 1634 } 1635 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1636 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1637 } 1638 #endif 1639 1640 if (AggressiveOpts) { 1641 // Sample flag setting code 1642 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1643 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1644 // } 1645 } 1646 } 1647 1648 //=========================================================================================================== 1649 // Parsing of java.compiler property 1650 1651 void Arguments::process_java_compiler_argument(char* arg) { 1652 // For backwards compatibility, Djava.compiler=NONE or "" 1653 // causes us to switch to -Xint mode UNLESS -Xdebug 1654 // is also specified. 1655 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1656 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1657 } 1658 } 1659 1660 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1661 _sun_java_launcher = strdup(launcher); 1662 if (strcmp("gamma", _sun_java_launcher) == 0) { 1663 _created_by_gamma_launcher = true; 1664 } 1665 } 1666 1667 bool Arguments::created_by_java_launcher() { 1668 assert(_sun_java_launcher != NULL, "property must have value"); 1669 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1670 } 1671 1672 bool Arguments::created_by_gamma_launcher() { 1673 return _created_by_gamma_launcher; 1674 } 1675 1676 //=========================================================================================================== 1677 // Parsing of main arguments 1678 1679 bool Arguments::verify_interval(uintx val, uintx min, 1680 uintx max, const char* name) { 1681 // Returns true iff value is in the inclusive interval [min..max] 1682 // false, otherwise. 1683 if (val >= min && val <= max) { 1684 return true; 1685 } 1686 jio_fprintf(defaultStream::error_stream(), 1687 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1688 " and " UINTX_FORMAT "\n", 1689 name, val, min, max); 1690 return false; 1691 } 1692 1693 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1694 // Returns true if given value is at least specified min threshold 1695 // false, otherwise. 1696 if (val >= min ) { 1697 return true; 1698 } 1699 jio_fprintf(defaultStream::error_stream(), 1700 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1701 name, val, min); 1702 return false; 1703 } 1704 1705 bool Arguments::verify_percentage(uintx value, const char* name) { 1706 if (value <= 100) { 1707 return true; 1708 } 1709 jio_fprintf(defaultStream::error_stream(), 1710 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1711 name, value); 1712 return false; 1713 } 1714 1715 static void force_serial_gc() { 1716 FLAG_SET_DEFAULT(UseSerialGC, true); 1717 FLAG_SET_DEFAULT(UseParNewGC, false); 1718 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1719 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1720 FLAG_SET_DEFAULT(UseParallelGC, false); 1721 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1722 FLAG_SET_DEFAULT(UseG1GC, false); 1723 } 1724 1725 static bool verify_serial_gc_flags() { 1726 return (UseSerialGC && 1727 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1728 UseParallelGC || UseParallelOldGC)); 1729 } 1730 1731 // check if do gclog rotation 1732 // +UseGCLogFileRotation is a must, 1733 // no gc log rotation when log file not supplied or 1734 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1735 void check_gclog_consistency() { 1736 if (UseGCLogFileRotation) { 1737 if ((Arguments::gc_log_filename() == NULL) || 1738 (NumberOfGCLogFiles == 0) || 1739 (GCLogFileSize == 0)) { 1740 jio_fprintf(defaultStream::output_stream(), 1741 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1742 "where num_of_file > 0 and num_of_size > 0\n" 1743 "GC log rotation is turned off\n"); 1744 UseGCLogFileRotation = false; 1745 } 1746 } 1747 1748 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1749 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1750 jio_fprintf(defaultStream::output_stream(), 1751 "GCLogFileSize changed to minimum 8K\n"); 1752 } 1753 } 1754 1755 // Check consistency of GC selection 1756 bool Arguments::check_gc_consistency() { 1757 check_gclog_consistency(); 1758 bool status = true; 1759 // Ensure that the user has not selected conflicting sets 1760 // of collectors. [Note: this check is merely a user convenience; 1761 // collectors over-ride each other so that only a non-conflicting 1762 // set is selected; however what the user gets is not what they 1763 // may have expected from the combination they asked for. It's 1764 // better to reduce user confusion by not allowing them to 1765 // select conflicting combinations. 1766 uint i = 0; 1767 if (UseSerialGC) i++; 1768 if (UseConcMarkSweepGC || UseParNewGC) i++; 1769 if (UseParallelGC || UseParallelOldGC) i++; 1770 if (UseG1GC) i++; 1771 if (i > 1) { 1772 jio_fprintf(defaultStream::error_stream(), 1773 "Conflicting collector combinations in option list; " 1774 "please refer to the release notes for the combinations " 1775 "allowed\n"); 1776 status = false; 1777 } 1778 1779 return status; 1780 } 1781 1782 // Check stack pages settings 1783 bool Arguments::check_stack_pages() 1784 { 1785 bool status = true; 1786 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1787 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1788 // greater stack shadow pages can't generate instruction to bang stack 1789 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1790 return status; 1791 } 1792 1793 // Check the consistency of vm_init_args 1794 bool Arguments::check_vm_args_consistency() { 1795 // Method for adding checks for flag consistency. 1796 // The intent is to warn the user of all possible conflicts, 1797 // before returning an error. 1798 // Note: Needs platform-dependent factoring. 1799 bool status = true; 1800 1801 #if ( (defined(COMPILER2) && defined(SPARC))) 1802 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1803 // on sparc doesn't require generation of a stub as is the case on, e.g., 1804 // x86. Normally, VM_Version_init must be called from init_globals in 1805 // init.cpp, which is called by the initial java thread *after* arguments 1806 // have been parsed. VM_Version_init gets called twice on sparc. 1807 extern void VM_Version_init(); 1808 VM_Version_init(); 1809 if (!VM_Version::has_v9()) { 1810 jio_fprintf(defaultStream::error_stream(), 1811 "V8 Machine detected, Server requires V9\n"); 1812 status = false; 1813 } 1814 #endif /* COMPILER2 && SPARC */ 1815 1816 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1817 // builds so the cost of stack banging can be measured. 1818 #if (defined(PRODUCT) && defined(SOLARIS)) 1819 if (!UseBoundThreads && !UseStackBanging) { 1820 jio_fprintf(defaultStream::error_stream(), 1821 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1822 1823 status = false; 1824 } 1825 #endif 1826 1827 if (TLABRefillWasteFraction == 0) { 1828 jio_fprintf(defaultStream::error_stream(), 1829 "TLABRefillWasteFraction should be a denominator, " 1830 "not " SIZE_FORMAT "\n", 1831 TLABRefillWasteFraction); 1832 status = false; 1833 } 1834 1835 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1836 "AdaptiveSizePolicyWeight"); 1837 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1838 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1839 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1840 1841 // Divide by bucket size to prevent a large size from causing rollover when 1842 // calculating amount of memory needed to be allocated for the String table. 1843 status = status && verify_interval(StringTableSize, defaultStringTableSize, 1844 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1845 1846 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1847 jio_fprintf(defaultStream::error_stream(), 1848 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1849 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1850 MinHeapFreeRatio, MaxHeapFreeRatio); 1851 status = false; 1852 } 1853 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1854 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1855 1856 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1857 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1858 } 1859 1860 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1861 // Settings to encourage splitting. 1862 if (!FLAG_IS_CMDLINE(NewRatio)) { 1863 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1864 } 1865 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1866 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1867 } 1868 } 1869 1870 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1871 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1872 if (GCTimeLimit == 100) { 1873 // Turn off gc-overhead-limit-exceeded checks 1874 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1875 } 1876 1877 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1878 1879 status = status && check_gc_consistency(); 1880 status = status && check_stack_pages(); 1881 1882 if (_has_alloc_profile) { 1883 if (UseParallelGC || UseParallelOldGC) { 1884 jio_fprintf(defaultStream::error_stream(), 1885 "error: invalid argument combination.\n" 1886 "Allocation profiling (-Xaprof) cannot be used together with " 1887 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1888 status = false; 1889 } 1890 if (UseConcMarkSweepGC) { 1891 jio_fprintf(defaultStream::error_stream(), 1892 "error: invalid argument combination.\n" 1893 "Allocation profiling (-Xaprof) cannot be used together with " 1894 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1895 status = false; 1896 } 1897 } 1898 1899 if (CMSIncrementalMode) { 1900 if (!UseConcMarkSweepGC) { 1901 jio_fprintf(defaultStream::error_stream(), 1902 "error: invalid argument combination.\n" 1903 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1904 "selected in order\nto use CMSIncrementalMode.\n"); 1905 status = false; 1906 } else { 1907 status = status && verify_percentage(CMSIncrementalDutyCycle, 1908 "CMSIncrementalDutyCycle"); 1909 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1910 "CMSIncrementalDutyCycleMin"); 1911 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1912 "CMSIncrementalSafetyFactor"); 1913 status = status && verify_percentage(CMSIncrementalOffset, 1914 "CMSIncrementalOffset"); 1915 status = status && verify_percentage(CMSExpAvgFactor, 1916 "CMSExpAvgFactor"); 1917 // If it was not set on the command line, set 1918 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1919 if (CMSInitiatingOccupancyFraction < 0) { 1920 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1921 } 1922 } 1923 } 1924 1925 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1926 // insists that we hold the requisite locks so that the iteration is 1927 // MT-safe. For the verification at start-up and shut-down, we don't 1928 // yet have a good way of acquiring and releasing these locks, 1929 // which are not visible at the CollectedHeap level. We want to 1930 // be able to acquire these locks and then do the iteration rather 1931 // than just disable the lock verification. This will be fixed under 1932 // bug 4788986. 1933 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1934 if (VerifyGCStartAt == 0) { 1935 warning("Heap verification at start-up disabled " 1936 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1937 VerifyGCStartAt = 1; // Disable verification at start-up 1938 } 1939 if (VerifyBeforeExit) { 1940 warning("Heap verification at shutdown disabled " 1941 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1942 VerifyBeforeExit = false; // Disable verification at shutdown 1943 } 1944 } 1945 1946 // Note: only executed in non-PRODUCT mode 1947 if (!UseAsyncConcMarkSweepGC && 1948 (ExplicitGCInvokesConcurrent || 1949 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1950 jio_fprintf(defaultStream::error_stream(), 1951 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1952 " with -UseAsyncConcMarkSweepGC"); 1953 status = false; 1954 } 1955 1956 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 1957 1958 #ifndef SERIALGC 1959 if (UseG1GC) { 1960 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1961 "InitiatingHeapOccupancyPercent"); 1962 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1963 "G1RefProcDrainInterval"); 1964 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1965 "G1ConcMarkStepDurationMillis"); 1966 } 1967 #endif 1968 1969 status = status && verify_interval(RefDiscoveryPolicy, 1970 ReferenceProcessor::DiscoveryPolicyMin, 1971 ReferenceProcessor::DiscoveryPolicyMax, 1972 "RefDiscoveryPolicy"); 1973 1974 // Limit the lower bound of this flag to 1 as it is used in a division 1975 // expression. 1976 status = status && verify_interval(TLABWasteTargetPercent, 1977 1, 100, "TLABWasteTargetPercent"); 1978 1979 status = status && verify_object_alignment(); 1980 1981 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 1982 "ClassMetaspaceSize"); 1983 1984 status = status && verify_interval(MarkStackSizeMax, 1985 1, (max_jint - 1), "MarkStackSizeMax"); 1986 1987 #ifdef SPARC 1988 if (UseConcMarkSweepGC || UseG1GC) { 1989 // Issue a stern warning if the user has explicitly set 1990 // UseMemSetInBOT (it is known to cause issues), but allow 1991 // use for experimentation and debugging. 1992 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 1993 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 1994 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 1995 " on sun4v; please understand that you are using at your own risk!"); 1996 } 1997 } 1998 #endif // SPARC 1999 2000 if (PrintNMTStatistics) { 2001 #if INCLUDE_NMT 2002 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2003 #endif // INCLUDE_NMT 2004 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2005 PrintNMTStatistics = false; 2006 #if INCLUDE_NMT 2007 } 2008 #endif 2009 } 2010 2011 return status; 2012 } 2013 2014 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2015 const char* option_type) { 2016 if (ignore) return false; 2017 2018 const char* spacer = " "; 2019 if (option_type == NULL) { 2020 option_type = ++spacer; // Set both to the empty string. 2021 } 2022 2023 if (os::obsolete_option(option)) { 2024 jio_fprintf(defaultStream::error_stream(), 2025 "Obsolete %s%soption: %s\n", option_type, spacer, 2026 option->optionString); 2027 return false; 2028 } else { 2029 jio_fprintf(defaultStream::error_stream(), 2030 "Unrecognized %s%soption: %s\n", option_type, spacer, 2031 option->optionString); 2032 return true; 2033 } 2034 } 2035 2036 static const char* user_assertion_options[] = { 2037 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2038 }; 2039 2040 static const char* system_assertion_options[] = { 2041 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2042 }; 2043 2044 // Return true if any of the strings in null-terminated array 'names' matches. 2045 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2046 // the option must match exactly. 2047 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2048 bool tail_allowed) { 2049 for (/* empty */; *names != NULL; ++names) { 2050 if (match_option(option, *names, tail)) { 2051 if (**tail == '\0' || tail_allowed && **tail == ':') { 2052 return true; 2053 } 2054 } 2055 } 2056 return false; 2057 } 2058 2059 bool Arguments::parse_uintx(const char* value, 2060 uintx* uintx_arg, 2061 uintx min_size) { 2062 2063 // Check the sign first since atomull() parses only unsigned values. 2064 bool value_is_positive = !(*value == '-'); 2065 2066 if (value_is_positive) { 2067 julong n; 2068 bool good_return = atomull(value, &n); 2069 if (good_return) { 2070 bool above_minimum = n >= min_size; 2071 bool value_is_too_large = n > max_uintx; 2072 2073 if (above_minimum && !value_is_too_large) { 2074 *uintx_arg = n; 2075 return true; 2076 } 2077 } 2078 } 2079 return false; 2080 } 2081 2082 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2083 julong* long_arg, 2084 julong min_size) { 2085 if (!atomull(s, long_arg)) return arg_unreadable; 2086 return check_memory_size(*long_arg, min_size); 2087 } 2088 2089 // Parse JavaVMInitArgs structure 2090 2091 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2092 // For components of the system classpath. 2093 SysClassPath scp(Arguments::get_sysclasspath()); 2094 bool scp_assembly_required = false; 2095 2096 // Save default settings for some mode flags 2097 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2098 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2099 Arguments::_ClipInlining = ClipInlining; 2100 Arguments::_BackgroundCompilation = BackgroundCompilation; 2101 2102 // Setup flags for mixed which is the default 2103 set_mode_flags(_mixed); 2104 2105 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2106 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2107 if (result != JNI_OK) { 2108 return result; 2109 } 2110 2111 // Parse JavaVMInitArgs structure passed in 2112 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2113 if (result != JNI_OK) { 2114 return result; 2115 } 2116 2117 if (AggressiveOpts) { 2118 // Insert alt-rt.jar between user-specified bootclasspath 2119 // prefix and the default bootclasspath. os::set_boot_path() 2120 // uses meta_index_dir as the default bootclasspath directory. 2121 const char* altclasses_jar = "alt-rt.jar"; 2122 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2123 strlen(altclasses_jar); 2124 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2125 strcpy(altclasses_path, get_meta_index_dir()); 2126 strcat(altclasses_path, altclasses_jar); 2127 scp.add_suffix_to_prefix(altclasses_path); 2128 scp_assembly_required = true; 2129 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2130 } 2131 2132 if (WhiteBoxAPI) { 2133 // Append wb.jar to bootclasspath if enabled 2134 const char* wb_jar = "wb.jar"; 2135 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 + 2136 strlen(wb_jar); 2137 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal); 2138 strcpy(wb_path, get_meta_index_dir()); 2139 strcat(wb_path, wb_jar); 2140 scp.add_suffix(wb_path); 2141 scp_assembly_required = true; 2142 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal); 2143 } 2144 2145 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2146 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2147 if (result != JNI_OK) { 2148 return result; 2149 } 2150 2151 // Do final processing now that all arguments have been parsed 2152 result = finalize_vm_init_args(&scp, scp_assembly_required); 2153 if (result != JNI_OK) { 2154 return result; 2155 } 2156 2157 return JNI_OK; 2158 } 2159 2160 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2161 SysClassPath* scp_p, 2162 bool* scp_assembly_required_p, 2163 FlagValueOrigin origin) { 2164 // Remaining part of option string 2165 const char* tail; 2166 2167 // iterate over arguments 2168 for (int index = 0; index < args->nOptions; index++) { 2169 bool is_absolute_path = false; // for -agentpath vs -agentlib 2170 2171 const JavaVMOption* option = args->options + index; 2172 2173 if (!match_option(option, "-Djava.class.path", &tail) && 2174 !match_option(option, "-Dsun.java.command", &tail) && 2175 !match_option(option, "-Dsun.java.launcher", &tail)) { 2176 2177 // add all jvm options to the jvm_args string. This string 2178 // is used later to set the java.vm.args PerfData string constant. 2179 // the -Djava.class.path and the -Dsun.java.command options are 2180 // omitted from jvm_args string as each have their own PerfData 2181 // string constant object. 2182 build_jvm_args(option->optionString); 2183 } 2184 2185 // -verbose:[class/gc/jni] 2186 if (match_option(option, "-verbose", &tail)) { 2187 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2188 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2189 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2190 } else if (!strcmp(tail, ":gc")) { 2191 FLAG_SET_CMDLINE(bool, PrintGC, true); 2192 } else if (!strcmp(tail, ":jni")) { 2193 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2194 } 2195 // -da / -ea / -disableassertions / -enableassertions 2196 // These accept an optional class/package name separated by a colon, e.g., 2197 // -da:java.lang.Thread. 2198 } else if (match_option(option, user_assertion_options, &tail, true)) { 2199 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2200 if (*tail == '\0') { 2201 JavaAssertions::setUserClassDefault(enable); 2202 } else { 2203 assert(*tail == ':', "bogus match by match_option()"); 2204 JavaAssertions::addOption(tail + 1, enable); 2205 } 2206 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2207 } else if (match_option(option, system_assertion_options, &tail, false)) { 2208 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2209 JavaAssertions::setSystemClassDefault(enable); 2210 // -bootclasspath: 2211 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2212 scp_p->reset_path(tail); 2213 *scp_assembly_required_p = true; 2214 // -bootclasspath/a: 2215 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2216 scp_p->add_suffix(tail); 2217 *scp_assembly_required_p = true; 2218 // -bootclasspath/p: 2219 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2220 scp_p->add_prefix(tail); 2221 *scp_assembly_required_p = true; 2222 // -Xrun 2223 } else if (match_option(option, "-Xrun", &tail)) { 2224 if (tail != NULL) { 2225 const char* pos = strchr(tail, ':'); 2226 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2227 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2228 name[len] = '\0'; 2229 2230 char *options = NULL; 2231 if(pos != NULL) { 2232 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2233 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2234 } 2235 #if !INCLUDE_JVMTI 2236 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2237 warning("profiling and debugging agents are not supported in this VM"); 2238 } else 2239 #endif // !INCLUDE_JVMTI 2240 add_init_library(name, options); 2241 } 2242 // -agentlib and -agentpath 2243 } else if (match_option(option, "-agentlib:", &tail) || 2244 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2245 if(tail != NULL) { 2246 const char* pos = strchr(tail, '='); 2247 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2248 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2249 name[len] = '\0'; 2250 2251 char *options = NULL; 2252 if(pos != NULL) { 2253 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2254 } 2255 #if !INCLUDE_JVMTI 2256 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2257 warning("profiling and debugging agents are not supported in this VM"); 2258 } else 2259 #endif // !INCLUDE_JVMTI 2260 add_init_agent(name, options, is_absolute_path); 2261 2262 } 2263 // -javaagent 2264 } else if (match_option(option, "-javaagent:", &tail)) { 2265 #if !INCLUDE_JVMTI 2266 warning("Instrumentation agents are not supported in this VM"); 2267 #else 2268 if(tail != NULL) { 2269 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2270 add_init_agent("instrument", options, false); 2271 } 2272 #endif // !INCLUDE_JVMTI 2273 // -Xnoclassgc 2274 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2275 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2276 // -Xincgc: i-CMS 2277 } else if (match_option(option, "-Xincgc", &tail)) { 2278 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2279 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2280 // -Xnoincgc: no i-CMS 2281 } else if (match_option(option, "-Xnoincgc", &tail)) { 2282 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2283 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2284 // -Xconcgc 2285 } else if (match_option(option, "-Xconcgc", &tail)) { 2286 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2287 // -Xnoconcgc 2288 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2289 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2290 // -Xbatch 2291 } else if (match_option(option, "-Xbatch", &tail)) { 2292 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2293 // -Xmn for compatibility with other JVM vendors 2294 } else if (match_option(option, "-Xmn", &tail)) { 2295 julong long_initial_eden_size = 0; 2296 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2297 if (errcode != arg_in_range) { 2298 jio_fprintf(defaultStream::error_stream(), 2299 "Invalid initial eden size: %s\n", option->optionString); 2300 describe_range_error(errcode); 2301 return JNI_EINVAL; 2302 } 2303 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2304 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2305 // -Xms 2306 } else if (match_option(option, "-Xms", &tail)) { 2307 julong long_initial_heap_size = 0; 2308 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2309 if (errcode != arg_in_range) { 2310 jio_fprintf(defaultStream::error_stream(), 2311 "Invalid initial heap size: %s\n", option->optionString); 2312 describe_range_error(errcode); 2313 return JNI_EINVAL; 2314 } 2315 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2316 // Currently the minimum size and the initial heap sizes are the same. 2317 set_min_heap_size(InitialHeapSize); 2318 // -Xmx 2319 } else if (match_option(option, "-Xmx", &tail)) { 2320 julong long_max_heap_size = 0; 2321 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2322 if (errcode != arg_in_range) { 2323 jio_fprintf(defaultStream::error_stream(), 2324 "Invalid maximum heap size: %s\n", option->optionString); 2325 describe_range_error(errcode); 2326 return JNI_EINVAL; 2327 } 2328 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2329 // Xmaxf 2330 } else if (match_option(option, "-Xmaxf", &tail)) { 2331 int maxf = (int)(atof(tail) * 100); 2332 if (maxf < 0 || maxf > 100) { 2333 jio_fprintf(defaultStream::error_stream(), 2334 "Bad max heap free percentage size: %s\n", 2335 option->optionString); 2336 return JNI_EINVAL; 2337 } else { 2338 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2339 } 2340 // Xminf 2341 } else if (match_option(option, "-Xminf", &tail)) { 2342 int minf = (int)(atof(tail) * 100); 2343 if (minf < 0 || minf > 100) { 2344 jio_fprintf(defaultStream::error_stream(), 2345 "Bad min heap free percentage size: %s\n", 2346 option->optionString); 2347 return JNI_EINVAL; 2348 } else { 2349 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2350 } 2351 // -Xss 2352 } else if (match_option(option, "-Xss", &tail)) { 2353 julong long_ThreadStackSize = 0; 2354 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2355 if (errcode != arg_in_range) { 2356 jio_fprintf(defaultStream::error_stream(), 2357 "Invalid thread stack size: %s\n", option->optionString); 2358 describe_range_error(errcode); 2359 return JNI_EINVAL; 2360 } 2361 // Internally track ThreadStackSize in units of 1024 bytes. 2362 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2363 round_to((int)long_ThreadStackSize, K) / K); 2364 // -Xoss 2365 } else if (match_option(option, "-Xoss", &tail)) { 2366 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2367 // -Xmaxjitcodesize 2368 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2369 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2370 julong long_ReservedCodeCacheSize = 0; 2371 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2372 (size_t)InitialCodeCacheSize); 2373 if (errcode != arg_in_range) { 2374 jio_fprintf(defaultStream::error_stream(), 2375 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2376 option->optionString, InitialCodeCacheSize/K); 2377 describe_range_error(errcode); 2378 return JNI_EINVAL; 2379 } 2380 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2381 // -green 2382 } else if (match_option(option, "-green", &tail)) { 2383 jio_fprintf(defaultStream::error_stream(), 2384 "Green threads support not available\n"); 2385 return JNI_EINVAL; 2386 // -native 2387 } else if (match_option(option, "-native", &tail)) { 2388 // HotSpot always uses native threads, ignore silently for compatibility 2389 // -Xsqnopause 2390 } else if (match_option(option, "-Xsqnopause", &tail)) { 2391 // EVM option, ignore silently for compatibility 2392 // -Xrs 2393 } else if (match_option(option, "-Xrs", &tail)) { 2394 // Classic/EVM option, new functionality 2395 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2396 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2397 // change default internal VM signals used - lower case for back compat 2398 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2399 // -Xoptimize 2400 } else if (match_option(option, "-Xoptimize", &tail)) { 2401 // EVM option, ignore silently for compatibility 2402 // -Xprof 2403 } else if (match_option(option, "-Xprof", &tail)) { 2404 #if INCLUDE_FPROF 2405 _has_profile = true; 2406 #else // INCLUDE_FPROF 2407 // do we have to exit? 2408 warning("Flat profiling is not supported in this VM."); 2409 #endif // INCLUDE_FPROF 2410 // -Xaprof 2411 } else if (match_option(option, "-Xaprof", &tail)) { 2412 _has_alloc_profile = true; 2413 // -Xconcurrentio 2414 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2415 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2416 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2417 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2418 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2419 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2420 2421 // -Xinternalversion 2422 } else if (match_option(option, "-Xinternalversion", &tail)) { 2423 jio_fprintf(defaultStream::output_stream(), "%s\n", 2424 VM_Version::internal_vm_info_string()); 2425 vm_exit(0); 2426 #ifndef PRODUCT 2427 // -Xprintflags 2428 } else if (match_option(option, "-Xprintflags", &tail)) { 2429 CommandLineFlags::printFlags(tty, false); 2430 vm_exit(0); 2431 #endif 2432 // -D 2433 } else if (match_option(option, "-D", &tail)) { 2434 if (!add_property(tail)) { 2435 return JNI_ENOMEM; 2436 } 2437 // Out of the box management support 2438 if (match_option(option, "-Dcom.sun.management", &tail)) { 2439 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2440 } 2441 // -Xint 2442 } else if (match_option(option, "-Xint", &tail)) { 2443 set_mode_flags(_int); 2444 // -Xmixed 2445 } else if (match_option(option, "-Xmixed", &tail)) { 2446 set_mode_flags(_mixed); 2447 // -Xcomp 2448 } else if (match_option(option, "-Xcomp", &tail)) { 2449 // for testing the compiler; turn off all flags that inhibit compilation 2450 set_mode_flags(_comp); 2451 2452 // -Xshare:dump 2453 } else if (match_option(option, "-Xshare:dump", &tail)) { 2454 #if defined(KERNEL) 2455 vm_exit_during_initialization( 2456 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2457 #elif !INCLUDE_CDS 2458 vm_exit_during_initialization( 2459 "Dumping a shared archive is not supported in this VM.", NULL); 2460 #else 2461 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2462 set_mode_flags(_int); // Prevent compilation, which creates objects 2463 #endif 2464 // -Xshare:on 2465 } else if (match_option(option, "-Xshare:on", &tail)) { 2466 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2467 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2468 // -Xshare:auto 2469 } else if (match_option(option, "-Xshare:auto", &tail)) { 2470 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2471 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2472 // -Xshare:off 2473 } else if (match_option(option, "-Xshare:off", &tail)) { 2474 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2475 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2476 2477 // -Xverify 2478 } else if (match_option(option, "-Xverify", &tail)) { 2479 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2480 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2481 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2482 } else if (strcmp(tail, ":remote") == 0) { 2483 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2484 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2485 } else if (strcmp(tail, ":none") == 0) { 2486 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2487 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2488 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2489 return JNI_EINVAL; 2490 } 2491 // -Xdebug 2492 } else if (match_option(option, "-Xdebug", &tail)) { 2493 // note this flag has been used, then ignore 2494 set_xdebug_mode(true); 2495 // -Xnoagent 2496 } else if (match_option(option, "-Xnoagent", &tail)) { 2497 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2498 } else if (match_option(option, "-Xboundthreads", &tail)) { 2499 // Bind user level threads to kernel threads (Solaris only) 2500 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2501 } else if (match_option(option, "-Xloggc:", &tail)) { 2502 // Redirect GC output to the file. -Xloggc:<filename> 2503 // ostream_init_log(), when called will use this filename 2504 // to initialize a fileStream. 2505 _gc_log_filename = strdup(tail); 2506 FLAG_SET_CMDLINE(bool, PrintGC, true); 2507 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2508 2509 // JNI hooks 2510 } else if (match_option(option, "-Xcheck", &tail)) { 2511 if (!strcmp(tail, ":jni")) { 2512 #if !INCLUDE_JNI_CHECK 2513 warning("JNI CHECKING is not supported in this VM"); 2514 #else 2515 CheckJNICalls = true; 2516 #endif // INCLUDE_JNI_CHECK 2517 } else if (is_bad_option(option, args->ignoreUnrecognized, 2518 "check")) { 2519 return JNI_EINVAL; 2520 } 2521 } else if (match_option(option, "vfprintf", &tail)) { 2522 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2523 } else if (match_option(option, "exit", &tail)) { 2524 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2525 } else if (match_option(option, "abort", &tail)) { 2526 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2527 // -XX:+AggressiveHeap 2528 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2529 2530 // This option inspects the machine and attempts to set various 2531 // parameters to be optimal for long-running, memory allocation 2532 // intensive jobs. It is intended for machines with large 2533 // amounts of cpu and memory. 2534 2535 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2536 // VM, but we may not be able to represent the total physical memory 2537 // available (like having 8gb of memory on a box but using a 32bit VM). 2538 // Thus, we need to make sure we're using a julong for intermediate 2539 // calculations. 2540 julong initHeapSize; 2541 julong total_memory = os::physical_memory(); 2542 2543 if (total_memory < (julong)256*M) { 2544 jio_fprintf(defaultStream::error_stream(), 2545 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2546 vm_exit(1); 2547 } 2548 2549 // The heap size is half of available memory, or (at most) 2550 // all of possible memory less 160mb (leaving room for the OS 2551 // when using ISM). This is the maximum; because adaptive sizing 2552 // is turned on below, the actual space used may be smaller. 2553 2554 initHeapSize = MIN2(total_memory / (julong)2, 2555 total_memory - (julong)160*M); 2556 2557 // Make sure that if we have a lot of memory we cap the 32 bit 2558 // process space. The 64bit VM version of this function is a nop. 2559 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2560 2561 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2562 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2563 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2564 // Currently the minimum size and the initial heap sizes are the same. 2565 set_min_heap_size(initHeapSize); 2566 } 2567 if (FLAG_IS_DEFAULT(NewSize)) { 2568 // Make the young generation 3/8ths of the total heap. 2569 FLAG_SET_CMDLINE(uintx, NewSize, 2570 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2571 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2572 } 2573 2574 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2575 FLAG_SET_DEFAULT(UseLargePages, true); 2576 #endif 2577 2578 // Increase some data structure sizes for efficiency 2579 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2580 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2581 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2582 2583 // See the OldPLABSize comment below, but replace 'after promotion' 2584 // with 'after copying'. YoungPLABSize is the size of the survivor 2585 // space per-gc-thread buffers. The default is 4kw. 2586 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2587 2588 // OldPLABSize is the size of the buffers in the old gen that 2589 // UseParallelGC uses to promote live data that doesn't fit in the 2590 // survivor spaces. At any given time, there's one for each gc thread. 2591 // The default size is 1kw. These buffers are rarely used, since the 2592 // survivor spaces are usually big enough. For specjbb, however, there 2593 // are occasions when there's lots of live data in the young gen 2594 // and we end up promoting some of it. We don't have a definite 2595 // explanation for why bumping OldPLABSize helps, but the theory 2596 // is that a bigger PLAB results in retaining something like the 2597 // original allocation order after promotion, which improves mutator 2598 // locality. A minor effect may be that larger PLABs reduce the 2599 // number of PLAB allocation events during gc. The value of 8kw 2600 // was arrived at by experimenting with specjbb. 2601 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2602 2603 // Enable parallel GC and adaptive generation sizing 2604 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2605 FLAG_SET_DEFAULT(ParallelGCThreads, 2606 Abstract_VM_Version::parallel_worker_threads()); 2607 2608 // Encourage steady state memory management 2609 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2610 2611 // This appears to improve mutator locality 2612 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2613 2614 // Get around early Solaris scheduling bug 2615 // (affinity vs other jobs on system) 2616 // but disallow DR and offlining (5008695). 2617 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2618 2619 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2620 // The last option must always win. 2621 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2622 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2623 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2624 // The last option must always win. 2625 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2626 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2627 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2628 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2629 jio_fprintf(defaultStream::error_stream(), 2630 "Please use CMSClassUnloadingEnabled in place of " 2631 "CMSPermGenSweepingEnabled in the future\n"); 2632 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2633 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2634 jio_fprintf(defaultStream::error_stream(), 2635 "Please use -XX:+UseGCOverheadLimit in place of " 2636 "-XX:+UseGCTimeLimit in the future\n"); 2637 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2638 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2639 jio_fprintf(defaultStream::error_stream(), 2640 "Please use -XX:-UseGCOverheadLimit in place of " 2641 "-XX:-UseGCTimeLimit in the future\n"); 2642 // The TLE options are for compatibility with 1.3 and will be 2643 // removed without notice in a future release. These options 2644 // are not to be documented. 2645 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2646 // No longer used. 2647 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2648 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2649 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2650 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2651 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2652 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2653 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2654 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2655 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2656 // No longer used. 2657 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2658 julong long_tlab_size = 0; 2659 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2660 if (errcode != arg_in_range) { 2661 jio_fprintf(defaultStream::error_stream(), 2662 "Invalid TLAB size: %s\n", option->optionString); 2663 describe_range_error(errcode); 2664 return JNI_EINVAL; 2665 } 2666 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2667 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2668 // No longer used. 2669 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2670 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2671 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2672 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2673 SOLARIS_ONLY( 2674 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2675 warning("-XX:+UsePermISM is obsolete."); 2676 FLAG_SET_CMDLINE(bool, UseISM, true); 2677 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2678 FLAG_SET_CMDLINE(bool, UseISM, false); 2679 ) 2680 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2681 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2682 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2683 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2684 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2685 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2686 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2687 #if defined(DTRACE_ENABLED) 2688 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2689 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2690 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2691 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2692 #else // defined(DTRACE_ENABLED) 2693 jio_fprintf(defaultStream::error_stream(), 2694 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2695 return JNI_EINVAL; 2696 #endif // defined(DTRACE_ENABLED) 2697 #ifdef ASSERT 2698 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2699 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2700 // disable scavenge before parallel mark-compact 2701 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2702 #endif 2703 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2704 julong cms_blocks_to_claim = (julong)atol(tail); 2705 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2706 jio_fprintf(defaultStream::error_stream(), 2707 "Please use -XX:OldPLABSize in place of " 2708 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2709 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2710 julong cms_blocks_to_claim = (julong)atol(tail); 2711 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2712 jio_fprintf(defaultStream::error_stream(), 2713 "Please use -XX:OldPLABSize in place of " 2714 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2715 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2716 julong old_plab_size = 0; 2717 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2718 if (errcode != arg_in_range) { 2719 jio_fprintf(defaultStream::error_stream(), 2720 "Invalid old PLAB size: %s\n", option->optionString); 2721 describe_range_error(errcode); 2722 return JNI_EINVAL; 2723 } 2724 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2725 jio_fprintf(defaultStream::error_stream(), 2726 "Please use -XX:OldPLABSize in place of " 2727 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2728 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2729 julong young_plab_size = 0; 2730 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2731 if (errcode != arg_in_range) { 2732 jio_fprintf(defaultStream::error_stream(), 2733 "Invalid young PLAB size: %s\n", option->optionString); 2734 describe_range_error(errcode); 2735 return JNI_EINVAL; 2736 } 2737 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2738 jio_fprintf(defaultStream::error_stream(), 2739 "Please use -XX:YoungPLABSize in place of " 2740 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2741 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2742 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2743 julong stack_size = 0; 2744 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2745 if (errcode != arg_in_range) { 2746 jio_fprintf(defaultStream::error_stream(), 2747 "Invalid mark stack size: %s\n", option->optionString); 2748 describe_range_error(errcode); 2749 return JNI_EINVAL; 2750 } 2751 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2752 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2753 julong max_stack_size = 0; 2754 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2755 if (errcode != arg_in_range) { 2756 jio_fprintf(defaultStream::error_stream(), 2757 "Invalid maximum mark stack size: %s\n", 2758 option->optionString); 2759 describe_range_error(errcode); 2760 return JNI_EINVAL; 2761 } 2762 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2763 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2764 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2765 uintx conc_threads = 0; 2766 if (!parse_uintx(tail, &conc_threads, 1)) { 2767 jio_fprintf(defaultStream::error_stream(), 2768 "Invalid concurrent threads: %s\n", option->optionString); 2769 return JNI_EINVAL; 2770 } 2771 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2772 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 2773 julong max_direct_memory_size = 0; 2774 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 2775 if (errcode != arg_in_range) { 2776 jio_fprintf(defaultStream::error_stream(), 2777 "Invalid maximum direct memory size: %s\n", 2778 option->optionString); 2779 describe_range_error(errcode); 2780 return JNI_EINVAL; 2781 } 2782 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 2783 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 2784 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 2785 // away and will cause VM initialization failures! 2786 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 2787 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 2788 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2789 // Skip -XX:Flags= since that case has already been handled 2790 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2791 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2792 return JNI_EINVAL; 2793 } 2794 } 2795 // Unknown option 2796 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2797 return JNI_ERR; 2798 } 2799 } 2800 2801 // Change the default value for flags which have different default values 2802 // when working with older JDKs. 2803 #ifdef LINUX 2804 if (JDK_Version::current().compare_major(6) <= 0 && 2805 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2806 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2807 } 2808 #endif // LINUX 2809 return JNI_OK; 2810 } 2811 2812 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2813 // This must be done after all -D arguments have been processed. 2814 scp_p->expand_endorsed(); 2815 2816 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2817 // Assemble the bootclasspath elements into the final path. 2818 Arguments::set_sysclasspath(scp_p->combined_path()); 2819 } 2820 2821 // This must be done after all arguments have been processed. 2822 // java_compiler() true means set to "NONE" or empty. 2823 if (java_compiler() && !xdebug_mode()) { 2824 // For backwards compatibility, we switch to interpreted mode if 2825 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2826 // not specified. 2827 set_mode_flags(_int); 2828 } 2829 if (CompileThreshold == 0) { 2830 set_mode_flags(_int); 2831 } 2832 2833 #ifndef COMPILER2 2834 // Don't degrade server performance for footprint 2835 if (FLAG_IS_DEFAULT(UseLargePages) && 2836 MaxHeapSize < LargePageHeapSizeThreshold) { 2837 // No need for large granularity pages w/small heaps. 2838 // Note that large pages are enabled/disabled for both the 2839 // Java heap and the code cache. 2840 FLAG_SET_DEFAULT(UseLargePages, false); 2841 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2842 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2843 } 2844 2845 // Tiered compilation is undefined with C1. 2846 TieredCompilation = false; 2847 #else 2848 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2849 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2850 } 2851 #endif 2852 2853 // If we are running in a headless jre, force java.awt.headless property 2854 // to be true unless the property has already been set. 2855 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2856 if (os::is_headless_jre()) { 2857 const char* headless = Arguments::get_property("java.awt.headless"); 2858 if (headless == NULL) { 2859 char envbuffer[128]; 2860 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2861 if (!add_property("java.awt.headless=true")) { 2862 return JNI_ENOMEM; 2863 } 2864 } else { 2865 char buffer[256]; 2866 strcpy(buffer, "java.awt.headless="); 2867 strcat(buffer, envbuffer); 2868 if (!add_property(buffer)) { 2869 return JNI_ENOMEM; 2870 } 2871 } 2872 } 2873 } 2874 2875 if (!check_vm_args_consistency()) { 2876 return JNI_ERR; 2877 } 2878 2879 return JNI_OK; 2880 } 2881 2882 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2883 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2884 scp_assembly_required_p); 2885 } 2886 2887 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2888 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2889 scp_assembly_required_p); 2890 } 2891 2892 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2893 const int N_MAX_OPTIONS = 64; 2894 const int OPTION_BUFFER_SIZE = 1024; 2895 char buffer[OPTION_BUFFER_SIZE]; 2896 2897 // The variable will be ignored if it exceeds the length of the buffer. 2898 // Don't check this variable if user has special privileges 2899 // (e.g. unix su command). 2900 if (os::getenv(name, buffer, sizeof(buffer)) && 2901 !os::have_special_privileges()) { 2902 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2903 jio_fprintf(defaultStream::error_stream(), 2904 "Picked up %s: %s\n", name, buffer); 2905 char* rd = buffer; // pointer to the input string (rd) 2906 int i; 2907 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2908 while (isspace(*rd)) rd++; // skip whitespace 2909 if (*rd == 0) break; // we re done when the input string is read completely 2910 2911 // The output, option string, overwrites the input string. 2912 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2913 // input string (rd). 2914 char* wrt = rd; 2915 2916 options[i++].optionString = wrt; // Fill in option 2917 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2918 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2919 int quote = *rd; // matching quote to look for 2920 rd++; // don't copy open quote 2921 while (*rd != quote) { // include everything (even spaces) up until quote 2922 if (*rd == 0) { // string termination means unmatched string 2923 jio_fprintf(defaultStream::error_stream(), 2924 "Unmatched quote in %s\n", name); 2925 return JNI_ERR; 2926 } 2927 *wrt++ = *rd++; // copy to option string 2928 } 2929 rd++; // don't copy close quote 2930 } else { 2931 *wrt++ = *rd++; // copy to option string 2932 } 2933 } 2934 // Need to check if we're done before writing a NULL, 2935 // because the write could be to the byte that rd is pointing to. 2936 if (*rd++ == 0) { 2937 *wrt = 0; 2938 break; 2939 } 2940 *wrt = 0; // Zero terminate option 2941 } 2942 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2943 JavaVMInitArgs vm_args; 2944 vm_args.version = JNI_VERSION_1_2; 2945 vm_args.options = options; 2946 vm_args.nOptions = i; 2947 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2948 2949 if (PrintVMOptions) { 2950 const char* tail; 2951 for (int i = 0; i < vm_args.nOptions; i++) { 2952 const JavaVMOption *option = vm_args.options + i; 2953 if (match_option(option, "-XX:", &tail)) { 2954 logOption(tail); 2955 } 2956 } 2957 } 2958 2959 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2960 } 2961 return JNI_OK; 2962 } 2963 2964 void Arguments::set_shared_spaces_flags() { 2965 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 2966 const bool might_share = must_share || UseSharedSpaces; 2967 2968 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 2969 // static fields are incorrect in the archive. With some more clever 2970 // initialization, this restriction can probably be lifted. 2971 // ??? UseLargePages might be okay now 2972 const bool cannot_share = UseCompressedOops || 2973 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages)); 2974 if (cannot_share) { 2975 if (must_share) { 2976 warning("disabling large pages %s" 2977 "because of %s", "" LP64_ONLY("and compressed oops "), 2978 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 2979 FLAG_SET_CMDLINE(bool, UseLargePages, false); 2980 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 2981 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false)); 2982 } else { 2983 // Prefer compressed oops and large pages to class data sharing 2984 if (UseSharedSpaces && Verbose) { 2985 warning("turning off use of shared archive because of large pages%s", 2986 "" LP64_ONLY(" and/or compressed oops")); 2987 } 2988 no_shared_spaces(); 2989 } 2990 } else if (UseLargePages && might_share) { 2991 // Disable large pages to allow shared spaces. This is sub-optimal, since 2992 // there may not even be a shared archive to use. 2993 FLAG_SET_DEFAULT(UseLargePages, false); 2994 } 2995 2996 // Add 2M to any size for SharedReadOnlySize to get around the JPRT setting 2997 if (DumpSharedSpaces && !FLAG_IS_DEFAULT(SharedReadOnlySize)) { 2998 SharedReadOnlySize = 14*M; 2999 } 3000 3001 if (DumpSharedSpaces) { 3002 if (RequireSharedSpaces) { 3003 warning("cannot dump shared archive while using shared archive"); 3004 } 3005 UseSharedSpaces = false; 3006 } 3007 } 3008 3009 // Disable options not supported in this release, with a warning if they 3010 // were explicitly requested on the command-line 3011 #define UNSUPPORTED_OPTION(opt, description) \ 3012 do { \ 3013 if (opt) { \ 3014 if (FLAG_IS_CMDLINE(opt)) { \ 3015 warning(description " is disabled in this release."); \ 3016 } \ 3017 FLAG_SET_DEFAULT(opt, false); \ 3018 } \ 3019 } while(0) 3020 3021 // Parse entry point called from JNI_CreateJavaVM 3022 3023 jint Arguments::parse(const JavaVMInitArgs* args) { 3024 3025 // Sharing support 3026 // Construct the path to the archive 3027 char jvm_path[JVM_MAXPATHLEN]; 3028 os::jvm_path(jvm_path, sizeof(jvm_path)); 3029 char *end = strrchr(jvm_path, *os::file_separator()); 3030 if (end != NULL) *end = '\0'; 3031 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 3032 strlen(os::file_separator()) + 20, mtInternal); 3033 if (shared_archive_path == NULL) return JNI_ENOMEM; 3034 strcpy(shared_archive_path, jvm_path); 3035 strcat(shared_archive_path, os::file_separator()); 3036 strcat(shared_archive_path, "classes"); 3037 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 3038 strcat(shared_archive_path, ".jsa"); 3039 SharedArchivePath = shared_archive_path; 3040 3041 // Remaining part of option string 3042 const char* tail; 3043 3044 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3045 const char* hotspotrc = ".hotspotrc"; 3046 bool settings_file_specified = false; 3047 bool needs_hotspotrc_warning = false; 3048 3049 const char* flags_file; 3050 int index; 3051 for (index = 0; index < args->nOptions; index++) { 3052 const JavaVMOption *option = args->options + index; 3053 if (match_option(option, "-XX:Flags=", &tail)) { 3054 flags_file = tail; 3055 settings_file_specified = true; 3056 } 3057 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3058 PrintVMOptions = true; 3059 } 3060 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3061 PrintVMOptions = false; 3062 } 3063 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3064 IgnoreUnrecognizedVMOptions = true; 3065 } 3066 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3067 IgnoreUnrecognizedVMOptions = false; 3068 } 3069 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3070 CommandLineFlags::printFlags(tty, false); 3071 vm_exit(0); 3072 } 3073 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3074 #if INCLUDE_NMT 3075 MemTracker::init_tracking_options(tail); 3076 #else 3077 warning("Native Memory Tracking is not supported in this VM"); 3078 #endif 3079 } 3080 3081 3082 #ifndef PRODUCT 3083 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3084 CommandLineFlags::printFlags(tty, true); 3085 vm_exit(0); 3086 } 3087 #endif 3088 } 3089 3090 if (IgnoreUnrecognizedVMOptions) { 3091 // uncast const to modify the flag args->ignoreUnrecognized 3092 *(jboolean*)(&args->ignoreUnrecognized) = true; 3093 } 3094 3095 // Parse specified settings file 3096 if (settings_file_specified) { 3097 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3098 return JNI_EINVAL; 3099 } 3100 } else { 3101 #ifdef ASSERT 3102 // Parse default .hotspotrc settings file 3103 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3104 return JNI_EINVAL; 3105 } 3106 #else 3107 struct stat buf; 3108 if (os::stat(hotspotrc, &buf) == 0) { 3109 needs_hotspotrc_warning = true; 3110 } 3111 #endif 3112 } 3113 3114 if (PrintVMOptions) { 3115 for (index = 0; index < args->nOptions; index++) { 3116 const JavaVMOption *option = args->options + index; 3117 if (match_option(option, "-XX:", &tail)) { 3118 logOption(tail); 3119 } 3120 } 3121 } 3122 3123 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3124 jint result = parse_vm_init_args(args); 3125 if (result != JNI_OK) { 3126 return result; 3127 } 3128 3129 // Delay warning until here so that we've had a chance to process 3130 // the -XX:-PrintWarnings flag 3131 if (needs_hotspotrc_warning) { 3132 warning("%s file is present but has been ignored. " 3133 "Run with -XX:Flags=%s to load the file.", 3134 hotspotrc, hotspotrc); 3135 } 3136 3137 #if (defined JAVASE_EMBEDDED || defined ARM) 3138 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3139 #endif 3140 3141 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3142 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3143 #endif 3144 3145 #if !INCLUDE_ALTERNATE_GCS 3146 if (UseParallelGC) { 3147 warning("Parallel GC is not supported in this VM. Using Serial GC."); 3148 } 3149 if (UseParallelOldGC) { 3150 warning("Parallel Old GC is not supported in this VM. Using Serial GC."); 3151 } 3152 if (UseConcMarkSweepGC) { 3153 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC."); 3154 } 3155 if (UseParNewGC) { 3156 warning("Par New GC is not supported in this VM. Using Serial GC."); 3157 } 3158 #endif // INCLUDE_ALTERNATE_GCS 3159 3160 #ifndef PRODUCT 3161 if (TraceBytecodesAt != 0) { 3162 TraceBytecodes = true; 3163 } 3164 if (CountCompiledCalls) { 3165 if (UseCounterDecay) { 3166 warning("UseCounterDecay disabled because CountCalls is set"); 3167 UseCounterDecay = false; 3168 } 3169 } 3170 #endif // PRODUCT 3171 3172 // JSR 292 is not supported before 1.7 3173 if (!JDK_Version::is_gte_jdk17x_version()) { 3174 if (EnableInvokeDynamic) { 3175 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3176 warning("JSR 292 is not supported before 1.7. Disabling support."); 3177 } 3178 EnableInvokeDynamic = false; 3179 } 3180 } 3181 3182 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3183 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3184 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3185 } 3186 ScavengeRootsInCode = 1; 3187 } 3188 3189 if (PrintGCDetails) { 3190 // Turn on -verbose:gc options as well 3191 PrintGC = true; 3192 } 3193 3194 if (!JDK_Version::is_gte_jdk18x_version()) { 3195 // To avoid changing the log format for 7 updates this flag is only 3196 // true by default in JDK8 and above. 3197 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3198 FLAG_SET_DEFAULT(PrintGCCause, false); 3199 } 3200 } 3201 3202 // Set object alignment values. 3203 set_object_alignment(); 3204 3205 #ifdef SERIALGC 3206 force_serial_gc(); 3207 #endif // SERIALGC 3208 #if !INCLUDE_CDS 3209 no_shared_spaces(); 3210 #endif // INCLUDE_CDS 3211 3212 // Set flags based on ergonomics. 3213 set_ergonomics_flags(); 3214 3215 set_shared_spaces_flags(); 3216 3217 // Check the GC selections again. 3218 if (!check_gc_consistency()) { 3219 return JNI_EINVAL; 3220 } 3221 3222 if (TieredCompilation) { 3223 set_tiered_flags(); 3224 } else { 3225 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3226 if (CompilationPolicyChoice >= 2) { 3227 vm_exit_during_initialization( 3228 "Incompatible compilation policy selected", NULL); 3229 } 3230 } 3231 3232 // Set heap size based on available physical memory 3233 set_heap_size(); 3234 3235 #if INCLUDE_ALTERNATE_GCS 3236 // Set per-collector flags 3237 if (UseParallelGC || UseParallelOldGC) { 3238 set_parallel_gc_flags(); 3239 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3240 set_cms_and_parnew_gc_flags(); 3241 } else if (UseParNewGC) { // skipped if CMS is set above 3242 set_parnew_gc_flags(); 3243 } else if (UseG1GC) { 3244 set_g1_gc_flags(); 3245 } 3246 #endif // INCLUDE_ALTERNATE_GCS 3247 3248 #ifdef SERIALGC 3249 assert(verify_serial_gc_flags(), "SerialGC unset"); 3250 #endif // SERIALGC 3251 3252 // Set bytecode rewriting flags 3253 set_bytecode_flags(); 3254 3255 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3256 set_aggressive_opts_flags(); 3257 3258 // Turn off biased locking for locking debug mode flags, 3259 // which are subtlely different from each other but neither works with 3260 // biased locking. 3261 if (UseHeavyMonitors 3262 #ifdef COMPILER1 3263 || !UseFastLocking 3264 #endif // COMPILER1 3265 ) { 3266 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3267 // flag set to true on command line; warn the user that they 3268 // can't enable biased locking here 3269 warning("Biased Locking is not supported with locking debug flags" 3270 "; ignoring UseBiasedLocking flag." ); 3271 } 3272 UseBiasedLocking = false; 3273 } 3274 3275 #ifdef CC_INTERP 3276 // Clear flags not supported by the C++ interpreter 3277 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3278 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3279 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3280 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3281 #endif // CC_INTERP 3282 3283 #ifdef COMPILER2 3284 if (!UseBiasedLocking || EmitSync != 0) { 3285 UseOptoBiasInlining = false; 3286 } 3287 if (!EliminateLocks) { 3288 EliminateNestedLocks = false; 3289 } 3290 #endif 3291 3292 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3293 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3294 DebugNonSafepoints = true; 3295 } 3296 3297 #ifndef PRODUCT 3298 if (CompileTheWorld) { 3299 // Force NmethodSweeper to sweep whole CodeCache each time. 3300 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3301 NmethodSweepFraction = 1; 3302 } 3303 } 3304 #endif 3305 3306 if (PrintCommandLineFlags) { 3307 CommandLineFlags::printSetFlags(tty); 3308 } 3309 3310 // Apply CPU specific policy for the BiasedLocking 3311 if (UseBiasedLocking) { 3312 if (!VM_Version::use_biased_locking() && 3313 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3314 UseBiasedLocking = false; 3315 } 3316 } 3317 3318 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3319 // but only if not already set on the commandline 3320 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3321 bool set = false; 3322 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3323 if (!set) { 3324 FLAG_SET_DEFAULT(PauseAtExit, true); 3325 } 3326 } 3327 3328 return JNI_OK; 3329 } 3330 3331 jint Arguments::adjust_after_os() { 3332 #if INCLUDE_ALTERNATE_GCS 3333 if (UseParallelGC || UseParallelOldGC) { 3334 if (UseNUMA) { 3335 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3336 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3337 } 3338 // For those collectors or operating systems (eg, Windows) that do 3339 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3340 UseNUMAInterleaving = true; 3341 } 3342 } 3343 #endif 3344 return JNI_OK; 3345 } 3346 3347 int Arguments::PropertyList_count(SystemProperty* pl) { 3348 int count = 0; 3349 while(pl != NULL) { 3350 count++; 3351 pl = pl->next(); 3352 } 3353 return count; 3354 } 3355 3356 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3357 assert(key != NULL, "just checking"); 3358 SystemProperty* prop; 3359 for (prop = pl; prop != NULL; prop = prop->next()) { 3360 if (strcmp(key, prop->key()) == 0) return prop->value(); 3361 } 3362 return NULL; 3363 } 3364 3365 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3366 int count = 0; 3367 const char* ret_val = NULL; 3368 3369 while(pl != NULL) { 3370 if(count >= index) { 3371 ret_val = pl->key(); 3372 break; 3373 } 3374 count++; 3375 pl = pl->next(); 3376 } 3377 3378 return ret_val; 3379 } 3380 3381 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3382 int count = 0; 3383 char* ret_val = NULL; 3384 3385 while(pl != NULL) { 3386 if(count >= index) { 3387 ret_val = pl->value(); 3388 break; 3389 } 3390 count++; 3391 pl = pl->next(); 3392 } 3393 3394 return ret_val; 3395 } 3396 3397 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3398 SystemProperty* p = *plist; 3399 if (p == NULL) { 3400 *plist = new_p; 3401 } else { 3402 while (p->next() != NULL) { 3403 p = p->next(); 3404 } 3405 p->set_next(new_p); 3406 } 3407 } 3408 3409 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3410 if (plist == NULL) 3411 return; 3412 3413 SystemProperty* new_p = new SystemProperty(k, v, true); 3414 PropertyList_add(plist, new_p); 3415 } 3416 3417 // This add maintains unique property key in the list. 3418 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3419 if (plist == NULL) 3420 return; 3421 3422 // If property key exist then update with new value. 3423 SystemProperty* prop; 3424 for (prop = *plist; prop != NULL; prop = prop->next()) { 3425 if (strcmp(k, prop->key()) == 0) { 3426 if (append) { 3427 prop->append_value(v); 3428 } else { 3429 prop->set_value(v); 3430 } 3431 return; 3432 } 3433 } 3434 3435 PropertyList_add(plist, k, v); 3436 } 3437 3438 #ifdef KERNEL 3439 char *Arguments::get_kernel_properties() { 3440 // Find properties starting with kernel and append them to string 3441 // We need to find out how long they are first because the URL's that they 3442 // might point to could get long. 3443 int length = 0; 3444 SystemProperty* prop; 3445 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3446 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3447 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3448 } 3449 } 3450 // Add one for null terminator. 3451 char *props = AllocateHeap(length + 1, mtInternal); 3452 if (length != 0) { 3453 int pos = 0; 3454 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3455 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3456 jio_snprintf(&props[pos], length-pos, 3457 "-D%s=%s ", prop->key(), prop->value()); 3458 pos = strlen(props); 3459 } 3460 } 3461 } 3462 // null terminate props in case of null 3463 props[length] = '\0'; 3464 return props; 3465 } 3466 #endif // KERNEL 3467 3468 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3469 // Returns true if all of the source pointed by src has been copied over to 3470 // the destination buffer pointed by buf. Otherwise, returns false. 3471 // Notes: 3472 // 1. If the length (buflen) of the destination buffer excluding the 3473 // NULL terminator character is not long enough for holding the expanded 3474 // pid characters, it also returns false instead of returning the partially 3475 // expanded one. 3476 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3477 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3478 char* buf, size_t buflen) { 3479 const char* p = src; 3480 char* b = buf; 3481 const char* src_end = &src[srclen]; 3482 char* buf_end = &buf[buflen - 1]; 3483 3484 while (p < src_end && b < buf_end) { 3485 if (*p == '%') { 3486 switch (*(++p)) { 3487 case '%': // "%%" ==> "%" 3488 *b++ = *p++; 3489 break; 3490 case 'p': { // "%p" ==> current process id 3491 // buf_end points to the character before the last character so 3492 // that we could write '\0' to the end of the buffer. 3493 size_t buf_sz = buf_end - b + 1; 3494 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3495 3496 // if jio_snprintf fails or the buffer is not long enough to hold 3497 // the expanded pid, returns false. 3498 if (ret < 0 || ret >= (int)buf_sz) { 3499 return false; 3500 } else { 3501 b += ret; 3502 assert(*b == '\0', "fail in copy_expand_pid"); 3503 if (p == src_end && b == buf_end + 1) { 3504 // reach the end of the buffer. 3505 return true; 3506 } 3507 } 3508 p++; 3509 break; 3510 } 3511 default : 3512 *b++ = '%'; 3513 } 3514 } else { 3515 *b++ = *p++; 3516 } 3517 } 3518 *b = '\0'; 3519 return (p == src_end); // return false if not all of the source was copied 3520 }