1 /* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "compiler/compilerOracle.hpp" 28 #include "memory/allocation.inline.hpp" 29 #include "memory/cardTableRS.hpp" 30 #include "memory/referenceProcessor.hpp" 31 #include "memory/universe.inline.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "prims/jvmtiExport.hpp" 34 #include "runtime/arguments.hpp" 35 #include "runtime/globals_extension.hpp" 36 #include "runtime/java.hpp" 37 #include "services/management.hpp" 38 #include "services/memTracker.hpp" 39 #include "utilities/defaultStream.hpp" 40 #include "utilities/taskqueue.hpp" 41 #ifdef TARGET_OS_FAMILY_linux 42 # include "os_linux.inline.hpp" 43 #endif 44 #ifdef TARGET_OS_FAMILY_solaris 45 # include "os_solaris.inline.hpp" 46 #endif 47 #ifdef TARGET_OS_FAMILY_windows 48 # include "os_windows.inline.hpp" 49 #endif 50 #ifdef TARGET_OS_FAMILY_bsd 51 # include "os_bsd.inline.hpp" 52 #endif 53 #ifndef SERIALGC 54 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 55 #endif 56 57 // Note: This is a special bug reporting site for the JVM 58 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 59 #define DEFAULT_JAVA_LAUNCHER "generic" 60 61 char** Arguments::_jvm_flags_array = NULL; 62 int Arguments::_num_jvm_flags = 0; 63 char** Arguments::_jvm_args_array = NULL; 64 int Arguments::_num_jvm_args = 0; 65 char* Arguments::_java_command = NULL; 66 SystemProperty* Arguments::_system_properties = NULL; 67 const char* Arguments::_gc_log_filename = NULL; 68 bool Arguments::_has_profile = false; 69 bool Arguments::_has_alloc_profile = false; 70 uintx Arguments::_min_heap_size = 0; 71 Arguments::Mode Arguments::_mode = _mixed; 72 bool Arguments::_java_compiler = false; 73 bool Arguments::_xdebug_mode = false; 74 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 75 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 76 int Arguments::_sun_java_launcher_pid = -1; 77 bool Arguments::_created_by_gamma_launcher = false; 78 79 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 80 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 81 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 82 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 83 bool Arguments::_ClipInlining = ClipInlining; 84 85 char* Arguments::SharedArchivePath = NULL; 86 87 AgentLibraryList Arguments::_libraryList; 88 AgentLibraryList Arguments::_agentList; 89 90 abort_hook_t Arguments::_abort_hook = NULL; 91 exit_hook_t Arguments::_exit_hook = NULL; 92 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 93 94 95 SystemProperty *Arguments::_java_ext_dirs = NULL; 96 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 97 SystemProperty *Arguments::_sun_boot_library_path = NULL; 98 SystemProperty *Arguments::_java_library_path = NULL; 99 SystemProperty *Arguments::_java_home = NULL; 100 SystemProperty *Arguments::_java_class_path = NULL; 101 SystemProperty *Arguments::_sun_boot_class_path = NULL; 102 103 char* Arguments::_meta_index_path = NULL; 104 char* Arguments::_meta_index_dir = NULL; 105 106 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 107 108 static bool match_option(const JavaVMOption *option, const char* name, 109 const char** tail) { 110 int len = (int)strlen(name); 111 if (strncmp(option->optionString, name, len) == 0) { 112 *tail = option->optionString + len; 113 return true; 114 } else { 115 return false; 116 } 117 } 118 119 static void logOption(const char* opt) { 120 if (PrintVMOptions) { 121 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 122 } 123 } 124 125 // Process java launcher properties. 126 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 127 // See if sun.java.launcher or sun.java.launcher.pid is defined. 128 // Must do this before setting up other system properties, 129 // as some of them may depend on launcher type. 130 for (int index = 0; index < args->nOptions; index++) { 131 const JavaVMOption* option = args->options + index; 132 const char* tail; 133 134 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 135 process_java_launcher_argument(tail, option->extraInfo); 136 continue; 137 } 138 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 139 _sun_java_launcher_pid = atoi(tail); 140 continue; 141 } 142 } 143 } 144 145 // Initialize system properties key and value. 146 void Arguments::init_system_properties() { 147 148 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 149 "Java Virtual Machine Specification", false)); 150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 153 154 // following are JVMTI agent writeable properties. 155 // Properties values are set to NULL and they are 156 // os specific they are initialized in os::init_system_properties_values(). 157 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 158 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 159 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 160 _java_library_path = new SystemProperty("java.library.path", NULL, true); 161 _java_home = new SystemProperty("java.home", NULL, true); 162 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 163 164 _java_class_path = new SystemProperty("java.class.path", "", true); 165 166 // Add to System Property list. 167 PropertyList_add(&_system_properties, _java_ext_dirs); 168 PropertyList_add(&_system_properties, _java_endorsed_dirs); 169 PropertyList_add(&_system_properties, _sun_boot_library_path); 170 PropertyList_add(&_system_properties, _java_library_path); 171 PropertyList_add(&_system_properties, _java_home); 172 PropertyList_add(&_system_properties, _java_class_path); 173 PropertyList_add(&_system_properties, _sun_boot_class_path); 174 175 // Set OS specific system properties values 176 os::init_system_properties_values(); 177 } 178 179 180 // Update/Initialize System properties after JDK version number is known 181 void Arguments::init_version_specific_system_properties() { 182 enum { bufsz = 16 }; 183 char buffer[bufsz]; 184 const char* spec_vendor = "Sun Microsystems Inc."; 185 uint32_t spec_version = 0; 186 187 if (JDK_Version::is_gte_jdk17x_version()) { 188 spec_vendor = "Oracle Corporation"; 189 spec_version = JDK_Version::current().major_version(); 190 } 191 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 192 193 PropertyList_add(&_system_properties, 194 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 195 PropertyList_add(&_system_properties, 196 new SystemProperty("java.vm.specification.version", buffer, false)); 197 PropertyList_add(&_system_properties, 198 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 199 } 200 201 /** 202 * Provide a slightly more user-friendly way of eliminating -XX flags. 203 * When a flag is eliminated, it can be added to this list in order to 204 * continue accepting this flag on the command-line, while issuing a warning 205 * and ignoring the value. Once the JDK version reaches the 'accept_until' 206 * limit, we flatly refuse to admit the existence of the flag. This allows 207 * a flag to die correctly over JDK releases using HSX. 208 */ 209 typedef struct { 210 const char* name; 211 JDK_Version obsoleted_in; // when the flag went away 212 JDK_Version accept_until; // which version to start denying the existence 213 } ObsoleteFlag; 214 215 static ObsoleteFlag obsolete_jvm_flags[] = { 216 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 217 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 218 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 230 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 231 { "DefaultInitialRAMFraction", 232 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 233 { "UseDepthFirstScavengeOrder", 234 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 235 { "HandlePromotionFailure", 236 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 237 { "MaxLiveObjectEvacuationRatio", 238 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 239 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 240 { "UseParallelOldGCCompacting", 241 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 242 { "UseParallelDensePrefixUpdate", 243 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 244 { "UseParallelOldGCDensePrefix", 245 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 246 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 247 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 248 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 249 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 250 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 251 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 252 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 253 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 254 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 255 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 256 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 257 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 258 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 259 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 260 #ifdef PRODUCT 261 { "DesiredMethodLimit", 262 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 263 #endif // PRODUCT 264 { NULL, JDK_Version(0), JDK_Version(0) } 265 }; 266 267 // Returns true if the flag is obsolete and fits into the range specified 268 // for being ignored. In the case that the flag is ignored, the 'version' 269 // value is filled in with the version number when the flag became 270 // obsolete so that that value can be displayed to the user. 271 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 272 int i = 0; 273 assert(version != NULL, "Must provide a version buffer"); 274 while (obsolete_jvm_flags[i].name != NULL) { 275 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 276 // <flag>=xxx form 277 // [-|+]<flag> form 278 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 279 ((s[0] == '+' || s[0] == '-') && 280 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 281 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 282 *version = flag_status.obsoleted_in; 283 return true; 284 } 285 } 286 i++; 287 } 288 return false; 289 } 290 291 // Constructs the system class path (aka boot class path) from the following 292 // components, in order: 293 // 294 // prefix // from -Xbootclasspath/p:... 295 // endorsed // the expansion of -Djava.endorsed.dirs=... 296 // base // from os::get_system_properties() or -Xbootclasspath= 297 // suffix // from -Xbootclasspath/a:... 298 // 299 // java.endorsed.dirs is a list of directories; any jar or zip files in the 300 // directories are added to the sysclasspath just before the base. 301 // 302 // This could be AllStatic, but it isn't needed after argument processing is 303 // complete. 304 class SysClassPath: public StackObj { 305 public: 306 SysClassPath(const char* base); 307 ~SysClassPath(); 308 309 inline void set_base(const char* base); 310 inline void add_prefix(const char* prefix); 311 inline void add_suffix_to_prefix(const char* suffix); 312 inline void add_suffix(const char* suffix); 313 inline void reset_path(const char* base); 314 315 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 316 // property. Must be called after all command-line arguments have been 317 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 318 // combined_path(). 319 void expand_endorsed(); 320 321 inline const char* get_base() const { return _items[_scp_base]; } 322 inline const char* get_prefix() const { return _items[_scp_prefix]; } 323 inline const char* get_suffix() const { return _items[_scp_suffix]; } 324 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 325 326 // Combine all the components into a single c-heap-allocated string; caller 327 // must free the string if/when no longer needed. 328 char* combined_path(); 329 330 private: 331 // Utility routines. 332 static char* add_to_path(const char* path, const char* str, bool prepend); 333 static char* add_jars_to_path(char* path, const char* directory); 334 335 inline void reset_item_at(int index); 336 337 // Array indices for the items that make up the sysclasspath. All except the 338 // base are allocated in the C heap and freed by this class. 339 enum { 340 _scp_prefix, // from -Xbootclasspath/p:... 341 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 342 _scp_base, // the default sysclasspath 343 _scp_suffix, // from -Xbootclasspath/a:... 344 _scp_nitems // the number of items, must be last. 345 }; 346 347 const char* _items[_scp_nitems]; 348 DEBUG_ONLY(bool _expansion_done;) 349 }; 350 351 SysClassPath::SysClassPath(const char* base) { 352 memset(_items, 0, sizeof(_items)); 353 _items[_scp_base] = base; 354 DEBUG_ONLY(_expansion_done = false;) 355 } 356 357 SysClassPath::~SysClassPath() { 358 // Free everything except the base. 359 for (int i = 0; i < _scp_nitems; ++i) { 360 if (i != _scp_base) reset_item_at(i); 361 } 362 DEBUG_ONLY(_expansion_done = false;) 363 } 364 365 inline void SysClassPath::set_base(const char* base) { 366 _items[_scp_base] = base; 367 } 368 369 inline void SysClassPath::add_prefix(const char* prefix) { 370 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 371 } 372 373 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 374 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 375 } 376 377 inline void SysClassPath::add_suffix(const char* suffix) { 378 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 379 } 380 381 inline void SysClassPath::reset_item_at(int index) { 382 assert(index < _scp_nitems && index != _scp_base, "just checking"); 383 if (_items[index] != NULL) { 384 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 385 _items[index] = NULL; 386 } 387 } 388 389 inline void SysClassPath::reset_path(const char* base) { 390 // Clear the prefix and suffix. 391 reset_item_at(_scp_prefix); 392 reset_item_at(_scp_suffix); 393 set_base(base); 394 } 395 396 //------------------------------------------------------------------------------ 397 398 void SysClassPath::expand_endorsed() { 399 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 400 401 const char* path = Arguments::get_property("java.endorsed.dirs"); 402 if (path == NULL) { 403 path = Arguments::get_endorsed_dir(); 404 assert(path != NULL, "no default for java.endorsed.dirs"); 405 } 406 407 char* expanded_path = NULL; 408 const char separator = *os::path_separator(); 409 const char* const end = path + strlen(path); 410 while (path < end) { 411 const char* tmp_end = strchr(path, separator); 412 if (tmp_end == NULL) { 413 expanded_path = add_jars_to_path(expanded_path, path); 414 path = end; 415 } else { 416 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 417 memcpy(dirpath, path, tmp_end - path); 418 dirpath[tmp_end - path] = '\0'; 419 expanded_path = add_jars_to_path(expanded_path, dirpath); 420 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 421 path = tmp_end + 1; 422 } 423 } 424 _items[_scp_endorsed] = expanded_path; 425 DEBUG_ONLY(_expansion_done = true;) 426 } 427 428 // Combine the bootclasspath elements, some of which may be null, into a single 429 // c-heap-allocated string. 430 char* SysClassPath::combined_path() { 431 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 432 assert(_expansion_done, "must call expand_endorsed() first."); 433 434 size_t lengths[_scp_nitems]; 435 size_t total_len = 0; 436 437 const char separator = *os::path_separator(); 438 439 // Get the lengths. 440 int i; 441 for (i = 0; i < _scp_nitems; ++i) { 442 if (_items[i] != NULL) { 443 lengths[i] = strlen(_items[i]); 444 // Include space for the separator char (or a NULL for the last item). 445 total_len += lengths[i] + 1; 446 } 447 } 448 assert(total_len > 0, "empty sysclasspath not allowed"); 449 450 // Copy the _items to a single string. 451 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 452 char* cp_tmp = cp; 453 for (i = 0; i < _scp_nitems; ++i) { 454 if (_items[i] != NULL) { 455 memcpy(cp_tmp, _items[i], lengths[i]); 456 cp_tmp += lengths[i]; 457 *cp_tmp++ = separator; 458 } 459 } 460 *--cp_tmp = '\0'; // Replace the extra separator. 461 return cp; 462 } 463 464 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 465 char* 466 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 467 char *cp; 468 469 assert(str != NULL, "just checking"); 470 if (path == NULL) { 471 size_t len = strlen(str) + 1; 472 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 473 memcpy(cp, str, len); // copy the trailing null 474 } else { 475 const char separator = *os::path_separator(); 476 size_t old_len = strlen(path); 477 size_t str_len = strlen(str); 478 size_t len = old_len + str_len + 2; 479 480 if (prepend) { 481 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 482 char* cp_tmp = cp; 483 memcpy(cp_tmp, str, str_len); 484 cp_tmp += str_len; 485 *cp_tmp = separator; 486 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 487 FREE_C_HEAP_ARRAY(char, path, mtInternal); 488 } else { 489 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 490 char* cp_tmp = cp + old_len; 491 *cp_tmp = separator; 492 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 493 } 494 } 495 return cp; 496 } 497 498 // Scan the directory and append any jar or zip files found to path. 499 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 500 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 501 DIR* dir = os::opendir(directory); 502 if (dir == NULL) return path; 503 504 char dir_sep[2] = { '\0', '\0' }; 505 size_t directory_len = strlen(directory); 506 const char fileSep = *os::file_separator(); 507 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 508 509 /* Scan the directory for jars/zips, appending them to path. */ 510 struct dirent *entry; 511 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 512 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 513 const char* name = entry->d_name; 514 const char* ext = name + strlen(name) - 4; 515 bool isJarOrZip = ext > name && 516 (os::file_name_strcmp(ext, ".jar") == 0 || 517 os::file_name_strcmp(ext, ".zip") == 0); 518 if (isJarOrZip) { 519 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 520 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 521 path = add_to_path(path, jarpath, false); 522 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 523 } 524 } 525 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 526 os::closedir(dir); 527 return path; 528 } 529 530 // Parses a memory size specification string. 531 static bool atomull(const char *s, julong* result) { 532 julong n = 0; 533 int args_read = sscanf(s, os::julong_format_specifier(), &n); 534 if (args_read != 1) { 535 return false; 536 } 537 while (*s != '\0' && isdigit(*s)) { 538 s++; 539 } 540 // 4705540: illegal if more characters are found after the first non-digit 541 if (strlen(s) > 1) { 542 return false; 543 } 544 switch (*s) { 545 case 'T': case 't': 546 *result = n * G * K; 547 // Check for overflow. 548 if (*result/((julong)G * K) != n) return false; 549 return true; 550 case 'G': case 'g': 551 *result = n * G; 552 if (*result/G != n) return false; 553 return true; 554 case 'M': case 'm': 555 *result = n * M; 556 if (*result/M != n) return false; 557 return true; 558 case 'K': case 'k': 559 *result = n * K; 560 if (*result/K != n) return false; 561 return true; 562 case '\0': 563 *result = n; 564 return true; 565 default: 566 return false; 567 } 568 } 569 570 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 571 if (size < min_size) return arg_too_small; 572 // Check that size will fit in a size_t (only relevant on 32-bit) 573 if (size > max_uintx) return arg_too_big; 574 return arg_in_range; 575 } 576 577 // Describe an argument out of range error 578 void Arguments::describe_range_error(ArgsRange errcode) { 579 switch(errcode) { 580 case arg_too_big: 581 jio_fprintf(defaultStream::error_stream(), 582 "The specified size exceeds the maximum " 583 "representable size.\n"); 584 break; 585 case arg_too_small: 586 case arg_unreadable: 587 case arg_in_range: 588 // do nothing for now 589 break; 590 default: 591 ShouldNotReachHere(); 592 } 593 } 594 595 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 596 return CommandLineFlags::boolAtPut(name, &value, origin); 597 } 598 599 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 600 double v; 601 if (sscanf(value, "%lf", &v) != 1) { 602 return false; 603 } 604 605 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 606 return true; 607 } 608 return false; 609 } 610 611 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 612 julong v; 613 intx intx_v; 614 bool is_neg = false; 615 // Check the sign first since atomull() parses only unsigned values. 616 if (*value == '-') { 617 if (!CommandLineFlags::intxAt(name, &intx_v)) { 618 return false; 619 } 620 value++; 621 is_neg = true; 622 } 623 if (!atomull(value, &v)) { 624 return false; 625 } 626 intx_v = (intx) v; 627 if (is_neg) { 628 intx_v = -intx_v; 629 } 630 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 631 return true; 632 } 633 uintx uintx_v = (uintx) v; 634 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 635 return true; 636 } 637 uint64_t uint64_t_v = (uint64_t) v; 638 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 639 return true; 640 } 641 return false; 642 } 643 644 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 645 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 646 // Contract: CommandLineFlags always returns a pointer that needs freeing. 647 FREE_C_HEAP_ARRAY(char, value, mtInternal); 648 return true; 649 } 650 651 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 652 const char* old_value = ""; 653 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 654 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 655 size_t new_len = strlen(new_value); 656 const char* value; 657 char* free_this_too = NULL; 658 if (old_len == 0) { 659 value = new_value; 660 } else if (new_len == 0) { 661 value = old_value; 662 } else { 663 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 664 // each new setting adds another LINE to the switch: 665 sprintf(buf, "%s\n%s", old_value, new_value); 666 value = buf; 667 free_this_too = buf; 668 } 669 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 670 // CommandLineFlags always returns a pointer that needs freeing. 671 FREE_C_HEAP_ARRAY(char, value, mtInternal); 672 if (free_this_too != NULL) { 673 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 674 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 675 } 676 return true; 677 } 678 679 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 680 681 // range of acceptable characters spelled out for portability reasons 682 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 683 #define BUFLEN 255 684 char name[BUFLEN+1]; 685 char dummy; 686 687 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 688 return set_bool_flag(name, false, origin); 689 } 690 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 691 return set_bool_flag(name, true, origin); 692 } 693 694 char punct; 695 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 696 const char* value = strchr(arg, '=') + 1; 697 Flag* flag = Flag::find_flag(name, strlen(name)); 698 if (flag != NULL && flag->is_ccstr()) { 699 if (flag->ccstr_accumulates()) { 700 return append_to_string_flag(name, value, origin); 701 } else { 702 if (value[0] == '\0') { 703 value = NULL; 704 } 705 return set_string_flag(name, value, origin); 706 } 707 } 708 } 709 710 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 711 const char* value = strchr(arg, '=') + 1; 712 // -XX:Foo:=xxx will reset the string flag to the given value. 713 if (value[0] == '\0') { 714 value = NULL; 715 } 716 return set_string_flag(name, value, origin); 717 } 718 719 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 720 #define SIGNED_NUMBER_RANGE "[-0123456789]" 721 #define NUMBER_RANGE "[0123456789]" 722 char value[BUFLEN + 1]; 723 char value2[BUFLEN + 1]; 724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 725 // Looks like a floating-point number -- try again with more lenient format string 726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 727 return set_fp_numeric_flag(name, value, origin); 728 } 729 } 730 731 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 732 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 733 return set_numeric_flag(name, value, origin); 734 } 735 736 return false; 737 } 738 739 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 740 assert(bldarray != NULL, "illegal argument"); 741 742 if (arg == NULL) { 743 return; 744 } 745 746 int index = *count; 747 748 // expand the array and add arg to the last element 749 (*count)++; 750 if (*bldarray == NULL) { 751 *bldarray = NEW_C_HEAP_ARRAY(char*, *count, mtInternal); 752 } else { 753 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count, mtInternal); 754 } 755 (*bldarray)[index] = strdup(arg); 756 } 757 758 void Arguments::build_jvm_args(const char* arg) { 759 add_string(&_jvm_args_array, &_num_jvm_args, arg); 760 } 761 762 void Arguments::build_jvm_flags(const char* arg) { 763 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 764 } 765 766 // utility function to return a string that concatenates all 767 // strings in a given char** array 768 const char* Arguments::build_resource_string(char** args, int count) { 769 if (args == NULL || count == 0) { 770 return NULL; 771 } 772 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 773 for (int i = 1; i < count; i++) { 774 length += strlen(args[i]) + 1; // add 1 for a space 775 } 776 char* s = NEW_RESOURCE_ARRAY(char, length); 777 strcpy(s, args[0]); 778 for (int j = 1; j < count; j++) { 779 strcat(s, " "); 780 strcat(s, args[j]); 781 } 782 return (const char*) s; 783 } 784 785 void Arguments::print_on(outputStream* st) { 786 st->print_cr("VM Arguments:"); 787 if (num_jvm_flags() > 0) { 788 st->print("jvm_flags: "); print_jvm_flags_on(st); 789 } 790 if (num_jvm_args() > 0) { 791 st->print("jvm_args: "); print_jvm_args_on(st); 792 } 793 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 794 st->print_cr("Launcher Type: %s", _sun_java_launcher); 795 } 796 797 void Arguments::print_jvm_flags_on(outputStream* st) { 798 if (_num_jvm_flags > 0) { 799 for (int i=0; i < _num_jvm_flags; i++) { 800 st->print("%s ", _jvm_flags_array[i]); 801 } 802 st->print_cr(""); 803 } 804 } 805 806 void Arguments::print_jvm_args_on(outputStream* st) { 807 if (_num_jvm_args > 0) { 808 for (int i=0; i < _num_jvm_args; i++) { 809 st->print("%s ", _jvm_args_array[i]); 810 } 811 st->print_cr(""); 812 } 813 } 814 815 bool Arguments::process_argument(const char* arg, 816 jboolean ignore_unrecognized, FlagValueOrigin origin) { 817 818 JDK_Version since = JDK_Version(); 819 820 if (parse_argument(arg, origin) || ignore_unrecognized) { 821 return true; 822 } 823 824 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg; 825 if (is_newly_obsolete(arg, &since)) { 826 char version[256]; 827 since.to_string(version, sizeof(version)); 828 warning("ignoring option %s; support was removed in %s", argname, version); 829 return true; 830 } 831 832 // For locked flags, report a custom error message if available. 833 // Otherwise, report the standard unrecognized VM option. 834 835 Flag* locked_flag = Flag::find_flag((char*)argname, strlen(argname), true); 836 if (locked_flag != NULL) { 837 char locked_message_buf[BUFLEN]; 838 locked_flag->get_locked_message(locked_message_buf, BUFLEN); 839 if (strlen(locked_message_buf) == 0) { 840 jio_fprintf(defaultStream::error_stream(), 841 "Unrecognized VM option '%s'\n", argname); 842 } else { 843 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 844 } 845 } else { 846 jio_fprintf(defaultStream::error_stream(), 847 "Unrecognized VM option '%s'\n", argname); 848 } 849 850 // allow for commandline "commenting out" options like -XX:#+Verbose 851 return arg[0] == '#'; 852 } 853 854 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 855 FILE* stream = fopen(file_name, "rb"); 856 if (stream == NULL) { 857 if (should_exist) { 858 jio_fprintf(defaultStream::error_stream(), 859 "Could not open settings file %s\n", file_name); 860 return false; 861 } else { 862 return true; 863 } 864 } 865 866 char token[1024]; 867 int pos = 0; 868 869 bool in_white_space = true; 870 bool in_comment = false; 871 bool in_quote = false; 872 char quote_c = 0; 873 bool result = true; 874 875 int c = getc(stream); 876 while(c != EOF) { 877 if (in_white_space) { 878 if (in_comment) { 879 if (c == '\n') in_comment = false; 880 } else { 881 if (c == '#') in_comment = true; 882 else if (!isspace(c)) { 883 in_white_space = false; 884 token[pos++] = c; 885 } 886 } 887 } else { 888 if (c == '\n' || (!in_quote && isspace(c))) { 889 // token ends at newline, or at unquoted whitespace 890 // this allows a way to include spaces in string-valued options 891 token[pos] = '\0'; 892 logOption(token); 893 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 894 build_jvm_flags(token); 895 pos = 0; 896 in_white_space = true; 897 in_quote = false; 898 } else if (!in_quote && (c == '\'' || c == '"')) { 899 in_quote = true; 900 quote_c = c; 901 } else if (in_quote && (c == quote_c)) { 902 in_quote = false; 903 } else { 904 token[pos++] = c; 905 } 906 } 907 c = getc(stream); 908 } 909 if (pos > 0) { 910 token[pos] = '\0'; 911 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 912 build_jvm_flags(token); 913 } 914 fclose(stream); 915 return result; 916 } 917 918 //============================================================================================================= 919 // Parsing of properties (-D) 920 921 const char* Arguments::get_property(const char* key) { 922 return PropertyList_get_value(system_properties(), key); 923 } 924 925 bool Arguments::add_property(const char* prop) { 926 const char* eq = strchr(prop, '='); 927 char* key; 928 // ns must be static--its address may be stored in a SystemProperty object. 929 const static char ns[1] = {0}; 930 char* value = (char *)ns; 931 932 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 933 key = AllocateHeap(key_len + 1, mtInternal); 934 strncpy(key, prop, key_len); 935 key[key_len] = '\0'; 936 937 if (eq != NULL) { 938 size_t value_len = strlen(prop) - key_len - 1; 939 value = AllocateHeap(value_len + 1, mtInternal); 940 strncpy(value, &prop[key_len + 1], value_len + 1); 941 } 942 943 if (strcmp(key, "java.compiler") == 0) { 944 process_java_compiler_argument(value); 945 FreeHeap(key); 946 if (eq != NULL) { 947 FreeHeap(value); 948 } 949 return true; 950 } else if (strcmp(key, "sun.java.command") == 0) { 951 _java_command = value; 952 953 // Record value in Arguments, but let it get passed to Java. 954 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 955 // launcher.pid property is private and is processed 956 // in process_sun_java_launcher_properties(); 957 // the sun.java.launcher property is passed on to the java application 958 FreeHeap(key); 959 if (eq != NULL) { 960 FreeHeap(value); 961 } 962 return true; 963 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 964 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 965 // its value without going through the property list or making a Java call. 966 _java_vendor_url_bug = value; 967 } else if (strcmp(key, "sun.boot.library.path") == 0) { 968 PropertyList_unique_add(&_system_properties, key, value, true); 969 return true; 970 } 971 // Create new property and add at the end of the list 972 PropertyList_unique_add(&_system_properties, key, value); 973 return true; 974 } 975 976 //=========================================================================================================== 977 // Setting int/mixed/comp mode flags 978 979 void Arguments::set_mode_flags(Mode mode) { 980 // Set up default values for all flags. 981 // If you add a flag to any of the branches below, 982 // add a default value for it here. 983 set_java_compiler(false); 984 _mode = mode; 985 986 // Ensure Agent_OnLoad has the correct initial values. 987 // This may not be the final mode; mode may change later in onload phase. 988 PropertyList_unique_add(&_system_properties, "java.vm.info", 989 (char*)VM_Version::vm_info_string(), false); 990 991 UseInterpreter = true; 992 UseCompiler = true; 993 UseLoopCounter = true; 994 995 #ifndef ZERO 996 // Turn these off for mixed and comp. Leave them on for Zero. 997 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 998 UseFastAccessorMethods = (mode == _int); 999 } 1000 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1001 UseFastEmptyMethods = (mode == _int); 1002 } 1003 #endif 1004 1005 // Default values may be platform/compiler dependent - 1006 // use the saved values 1007 ClipInlining = Arguments::_ClipInlining; 1008 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1009 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1010 BackgroundCompilation = Arguments::_BackgroundCompilation; 1011 1012 // Change from defaults based on mode 1013 switch (mode) { 1014 default: 1015 ShouldNotReachHere(); 1016 break; 1017 case _int: 1018 UseCompiler = false; 1019 UseLoopCounter = false; 1020 AlwaysCompileLoopMethods = false; 1021 UseOnStackReplacement = false; 1022 break; 1023 case _mixed: 1024 // same as default 1025 break; 1026 case _comp: 1027 UseInterpreter = false; 1028 BackgroundCompilation = false; 1029 ClipInlining = false; 1030 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1031 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1032 // compile a level 4 (C2) and then continue executing it. 1033 if (TieredCompilation) { 1034 Tier3InvokeNotifyFreqLog = 0; 1035 Tier4InvocationThreshold = 0; 1036 } 1037 break; 1038 } 1039 } 1040 1041 // Conflict: required to use shared spaces (-Xshare:on), but 1042 // incompatible command line options were chosen. 1043 1044 static void no_shared_spaces() { 1045 if (RequireSharedSpaces) { 1046 jio_fprintf(defaultStream::error_stream(), 1047 "Class data sharing is inconsistent with other specified options.\n"); 1048 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1049 } else { 1050 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1051 } 1052 } 1053 1054 void Arguments::set_tiered_flags() { 1055 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1056 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1057 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1058 } 1059 if (CompilationPolicyChoice < 2) { 1060 vm_exit_during_initialization( 1061 "Incompatible compilation policy selected", NULL); 1062 } 1063 // Increase the code cache size - tiered compiles a lot more. 1064 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1065 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1066 } 1067 } 1068 1069 #if INCLUDE_ALTERNATE_GCS 1070 static void disable_adaptive_size_policy(const char* collector_name) { 1071 if (UseAdaptiveSizePolicy) { 1072 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1073 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1074 collector_name); 1075 } 1076 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1077 } 1078 } 1079 1080 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 1081 // if it's not explictly set or unset. If the user has chosen 1082 // UseParNewGC and not explicitly set ParallelGCThreads we 1083 // set it, unless this is a single cpu machine. 1084 void Arguments::set_parnew_gc_flags() { 1085 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1086 "control point invariant"); 1087 assert(UseParNewGC, "Error"); 1088 1089 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1090 disable_adaptive_size_policy("UseParNewGC"); 1091 1092 if (ParallelGCThreads == 0) { 1093 FLAG_SET_DEFAULT(ParallelGCThreads, 1094 Abstract_VM_Version::parallel_worker_threads()); 1095 if (ParallelGCThreads == 1) { 1096 FLAG_SET_DEFAULT(UseParNewGC, false); 1097 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 1098 } 1099 } 1100 if (UseParNewGC) { 1101 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1102 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1103 // we set them to 1024 and 1024. 1104 // See CR 6362902. 1105 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1106 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1107 } 1108 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1109 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1110 } 1111 1112 // AlwaysTenure flag should make ParNew promote all at first collection. 1113 // See CR 6362902. 1114 if (AlwaysTenure) { 1115 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 1116 } 1117 // When using compressed oops, we use local overflow stacks, 1118 // rather than using a global overflow list chained through 1119 // the klass word of the object's pre-image. 1120 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1121 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1122 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1123 } 1124 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1125 } 1126 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1127 } 1128 } 1129 1130 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1131 // sparc/solaris for certain applications, but would gain from 1132 // further optimization and tuning efforts, and would almost 1133 // certainly gain from analysis of platform and environment. 1134 void Arguments::set_cms_and_parnew_gc_flags() { 1135 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1136 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1137 1138 // If we are using CMS, we prefer to UseParNewGC, 1139 // unless explicitly forbidden. 1140 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1141 FLAG_SET_ERGO(bool, UseParNewGC, true); 1142 } 1143 1144 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1145 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1146 1147 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1148 // as needed. 1149 if (UseParNewGC) { 1150 set_parnew_gc_flags(); 1151 } 1152 1153 // MaxHeapSize is aligned down in collectorPolicy 1154 size_t max_heap = align_size_down(MaxHeapSize, 1155 CardTableRS::ct_max_alignment_constraint()); 1156 1157 // Now make adjustments for CMS 1158 intx tenuring_default = (intx)6; 1159 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1160 1161 // Preferred young gen size for "short" pauses: 1162 // upper bound depends on # of threads and NewRatio. 1163 const uintx parallel_gc_threads = 1164 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1165 const size_t preferred_max_new_size_unaligned = 1166 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1167 size_t preferred_max_new_size = 1168 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1169 1170 // Unless explicitly requested otherwise, size young gen 1171 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1172 1173 // If either MaxNewSize or NewRatio is set on the command line, 1174 // assume the user is trying to set the size of the young gen. 1175 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1176 1177 // Set MaxNewSize to our calculated preferred_max_new_size unless 1178 // NewSize was set on the command line and it is larger than 1179 // preferred_max_new_size. 1180 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1181 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1182 } else { 1183 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1184 } 1185 if (PrintGCDetails && Verbose) { 1186 // Too early to use gclog_or_tty 1187 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1188 } 1189 1190 // Code along this path potentially sets NewSize and OldSize 1191 1192 assert(max_heap >= InitialHeapSize, "Error"); 1193 assert(max_heap >= NewSize, "Error"); 1194 1195 if (PrintGCDetails && Verbose) { 1196 // Too early to use gclog_or_tty 1197 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1198 " initial_heap_size: " SIZE_FORMAT 1199 " max_heap: " SIZE_FORMAT, 1200 min_heap_size(), InitialHeapSize, max_heap); 1201 } 1202 size_t min_new = preferred_max_new_size; 1203 if (FLAG_IS_CMDLINE(NewSize)) { 1204 min_new = NewSize; 1205 } 1206 if (max_heap > min_new && min_heap_size() > min_new) { 1207 // Unless explicitly requested otherwise, make young gen 1208 // at least min_new, and at most preferred_max_new_size. 1209 if (FLAG_IS_DEFAULT(NewSize)) { 1210 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1211 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1212 if (PrintGCDetails && Verbose) { 1213 // Too early to use gclog_or_tty 1214 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1215 } 1216 } 1217 // Unless explicitly requested otherwise, size old gen 1218 // so it's NewRatio x of NewSize. 1219 if (FLAG_IS_DEFAULT(OldSize)) { 1220 if (max_heap > NewSize) { 1221 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1222 if (PrintGCDetails && Verbose) { 1223 // Too early to use gclog_or_tty 1224 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1225 } 1226 } 1227 } 1228 } 1229 } 1230 // Unless explicitly requested otherwise, definitely 1231 // promote all objects surviving "tenuring_default" scavenges. 1232 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1233 FLAG_IS_DEFAULT(SurvivorRatio)) { 1234 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1235 } 1236 // If we decided above (or user explicitly requested) 1237 // `promote all' (via MaxTenuringThreshold := 0), 1238 // prefer minuscule survivor spaces so as not to waste 1239 // space for (non-existent) survivors 1240 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1241 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1242 } 1243 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1244 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1245 // This is done in order to make ParNew+CMS configuration to work 1246 // with YoungPLABSize and OldPLABSize options. 1247 // See CR 6362902. 1248 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1249 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1250 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1251 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1252 // the value (either from the command line or ergonomics) of 1253 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1254 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1255 } else { 1256 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1257 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1258 // we'll let it to take precedence. 1259 jio_fprintf(defaultStream::error_stream(), 1260 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1261 " options are specified for the CMS collector." 1262 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1263 } 1264 } 1265 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1266 // OldPLAB sizing manually turned off: Use a larger default setting, 1267 // unless it was manually specified. This is because a too-low value 1268 // will slow down scavenges. 1269 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1270 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1271 } 1272 } 1273 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1274 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1275 // If either of the static initialization defaults have changed, note this 1276 // modification. 1277 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1278 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1279 } 1280 if (PrintGCDetails && Verbose) { 1281 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1282 MarkStackSize / K, MarkStackSizeMax / K); 1283 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1284 } 1285 } 1286 #endif // INCLUDE_ALTERNATE_GCS 1287 1288 void set_object_alignment() { 1289 // Object alignment. 1290 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1291 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1292 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1293 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1294 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1295 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1296 1297 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1298 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1299 1300 // Oop encoding heap max 1301 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1302 1303 #if INCLUDE_ALTERNATE_GCS 1304 // Set CMS global values 1305 CompactibleFreeListSpace::set_cms_values(); 1306 #endif // INCLUDE_ALTERNATE_GCS 1307 } 1308 1309 bool verify_object_alignment() { 1310 // Object alignment. 1311 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1312 jio_fprintf(defaultStream::error_stream(), 1313 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1314 (int)ObjectAlignmentInBytes); 1315 return false; 1316 } 1317 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1318 jio_fprintf(defaultStream::error_stream(), 1319 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1320 (int)ObjectAlignmentInBytes, BytesPerLong); 1321 return false; 1322 } 1323 // It does not make sense to have big object alignment 1324 // since a space lost due to alignment will be greater 1325 // then a saved space from compressed oops. 1326 if ((int)ObjectAlignmentInBytes > 256) { 1327 jio_fprintf(defaultStream::error_stream(), 1328 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n", 1329 (int)ObjectAlignmentInBytes); 1330 return false; 1331 } 1332 // In case page size is very small. 1333 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1334 jio_fprintf(defaultStream::error_stream(), 1335 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n", 1336 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1337 return false; 1338 } 1339 return true; 1340 } 1341 1342 inline uintx max_heap_for_compressed_oops() { 1343 // Avoid sign flip. 1344 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) { 1345 return 0; 1346 } 1347 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size()); 1348 NOT_LP64(ShouldNotReachHere(); return 0); 1349 } 1350 1351 bool Arguments::should_auto_select_low_pause_collector() { 1352 if (UseAutoGCSelectPolicy && 1353 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1354 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1355 if (PrintGCDetails) { 1356 // Cannot use gclog_or_tty yet. 1357 tty->print_cr("Automatic selection of the low pause collector" 1358 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1359 } 1360 return true; 1361 } 1362 return false; 1363 } 1364 1365 void Arguments::set_ergonomics_flags() { 1366 1367 if (os::is_server_class_machine()) { 1368 // If no other collector is requested explicitly, 1369 // let the VM select the collector based on 1370 // machine class and automatic selection policy. 1371 if (!UseSerialGC && 1372 !UseConcMarkSweepGC && 1373 !UseG1GC && 1374 !UseParNewGC && 1375 FLAG_IS_DEFAULT(UseParallelGC)) { 1376 if (should_auto_select_low_pause_collector()) { 1377 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1378 } else { 1379 FLAG_SET_ERGO(bool, UseParallelGC, true); 1380 } 1381 } 1382 // Shared spaces work fine with other GCs but causes bytecode rewriting 1383 // to be disabled, which hurts interpreter performance and decreases 1384 // server performance. On server class machines, keep the default 1385 // off unless it is asked for. Future work: either add bytecode rewriting 1386 // at link time, or rewrite bytecodes in non-shared methods. 1387 if (!DumpSharedSpaces && !RequireSharedSpaces) { 1388 no_shared_spaces(); 1389 } 1390 } 1391 1392 #ifndef ZERO 1393 #ifdef _LP64 1394 // Check that UseCompressedOops can be set with the max heap size allocated 1395 // by ergonomics. 1396 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1397 #if !defined(COMPILER1) || defined(TIERED) 1398 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1399 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1400 } 1401 #endif 1402 #ifdef _WIN64 1403 if (UseLargePages && UseCompressedOops) { 1404 // Cannot allocate guard pages for implicit checks in indexed addressing 1405 // mode, when large pages are specified on windows. 1406 // This flag could be switched ON if narrow oop base address is set to 0, 1407 // see code in Universe::initialize_heap(). 1408 Universe::set_narrow_oop_use_implicit_null_checks(false); 1409 } 1410 #endif // _WIN64 1411 } else { 1412 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1413 warning("Max heap size too large for Compressed Oops"); 1414 FLAG_SET_DEFAULT(UseCompressedOops, false); 1415 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1416 } 1417 } 1418 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1419 if (!UseCompressedOops) { 1420 if (UseCompressedKlassPointers) { 1421 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1422 } 1423 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1424 } else { 1425 // Turn on UseCompressedKlassPointers too 1426 // The compiler is broken for this so turn it on when the compiler is fixed. 1427 // if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1428 // FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1429 // } 1430 // Set the ClassMetaspaceSize to something that will not need to be 1431 // expanded, since it cannot be expanded. 1432 if (UseCompressedKlassPointers && FLAG_IS_DEFAULT(ClassMetaspaceSize)) { 1433 // 100,000 classes seems like a good size, so 100M assumes around 1K 1434 // per klass. The vtable and oopMap is embedded so we don't have a fixed 1435 // size per klass. Eventually, this will be parameterized because it 1436 // would also be useful to determine the optimal size of the 1437 // systemDictionary. 1438 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M); 1439 } 1440 } 1441 // Also checks that certain machines are slower with compressed oops 1442 // in vm_version initialization code. 1443 #endif // _LP64 1444 #endif // !ZERO 1445 } 1446 1447 void Arguments::set_parallel_gc_flags() { 1448 assert(UseParallelGC || UseParallelOldGC, "Error"); 1449 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1450 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1451 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1452 } 1453 FLAG_SET_DEFAULT(UseParallelGC, true); 1454 1455 // If no heap maximum was requested explicitly, use some reasonable fraction 1456 // of the physical memory, up to a maximum of 1GB. 1457 if (UseParallelGC) { 1458 FLAG_SET_DEFAULT(ParallelGCThreads, 1459 Abstract_VM_Version::parallel_worker_threads()); 1460 1461 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1462 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1463 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1464 // See CR 6362902 for details. 1465 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1466 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1467 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1468 } 1469 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1470 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1471 } 1472 } 1473 1474 if (UseParallelOldGC) { 1475 // Par compact uses lower default values since they are treated as 1476 // minimums. These are different defaults because of the different 1477 // interpretation and are not ergonomically set. 1478 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1479 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1480 } 1481 } 1482 } 1483 if (UseNUMA) { 1484 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 1485 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 1486 } 1487 // For those collectors or operating systems (eg, Windows) that do 1488 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 1489 UseNUMAInterleaving = true; 1490 } 1491 } 1492 1493 void Arguments::set_g1_gc_flags() { 1494 assert(UseG1GC, "Error"); 1495 #ifdef COMPILER1 1496 FastTLABRefill = false; 1497 #endif 1498 FLAG_SET_DEFAULT(ParallelGCThreads, 1499 Abstract_VM_Version::parallel_worker_threads()); 1500 if (ParallelGCThreads == 0) { 1501 FLAG_SET_DEFAULT(ParallelGCThreads, 1502 Abstract_VM_Version::parallel_worker_threads()); 1503 } 1504 1505 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1506 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1507 } 1508 if (PrintGCDetails && Verbose) { 1509 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1510 MarkStackSize / K, MarkStackSizeMax / K); 1511 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1512 } 1513 1514 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1515 // In G1, we want the default GC overhead goal to be higher than 1516 // say in PS. So we set it here to 10%. Otherwise the heap might 1517 // be expanded more aggressively than we would like it to. In 1518 // fact, even 10% seems to not be high enough in some cases 1519 // (especially small GC stress tests that the main thing they do 1520 // is allocation). We might consider increase it further. 1521 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1522 } 1523 } 1524 1525 void Arguments::set_heap_size() { 1526 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1527 // Deprecated flag 1528 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1529 } 1530 1531 const julong phys_mem = 1532 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1533 : (julong)MaxRAM; 1534 1535 // If the maximum heap size has not been set with -Xmx, 1536 // then set it as fraction of the size of physical memory, 1537 // respecting the maximum and minimum sizes of the heap. 1538 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1539 julong reasonable_max = phys_mem / MaxRAMFraction; 1540 1541 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1542 // Small physical memory, so use a minimum fraction of it for the heap 1543 reasonable_max = phys_mem / MinRAMFraction; 1544 } else { 1545 // Not-small physical memory, so require a heap at least 1546 // as large as MaxHeapSize 1547 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1548 } 1549 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1550 // Limit the heap size to ErgoHeapSizeLimit 1551 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1552 } 1553 if (UseCompressedOops) { 1554 // Limit the heap size to the maximum possible when using compressed oops 1555 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1556 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1557 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1558 // but it should be not less than default MaxHeapSize. 1559 max_coop_heap -= HeapBaseMinAddress; 1560 } 1561 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1562 } 1563 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1564 1565 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1566 // An initial heap size was specified on the command line, 1567 // so be sure that the maximum size is consistent. Done 1568 // after call to allocatable_physical_memory because that 1569 // method might reduce the allocation size. 1570 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1571 } 1572 1573 if (PrintGCDetails && Verbose) { 1574 // Cannot use gclog_or_tty yet. 1575 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1576 } 1577 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1578 } 1579 1580 // If the initial_heap_size has not been set with InitialHeapSize 1581 // or -Xms, then set it as fraction of the size of physical memory, 1582 // respecting the maximum and minimum sizes of the heap. 1583 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1584 julong reasonable_minimum = (julong)(OldSize + NewSize); 1585 1586 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1587 1588 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1589 1590 julong reasonable_initial = phys_mem / InitialRAMFraction; 1591 1592 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1593 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1594 1595 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1596 1597 if (PrintGCDetails && Verbose) { 1598 // Cannot use gclog_or_tty yet. 1599 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1600 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1601 } 1602 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1603 set_min_heap_size((uintx)reasonable_minimum); 1604 } 1605 } 1606 1607 // This must be called after ergonomics because we want bytecode rewriting 1608 // if the server compiler is used, or if UseSharedSpaces is disabled. 1609 void Arguments::set_bytecode_flags() { 1610 // Better not attempt to store into a read-only space. 1611 if (UseSharedSpaces) { 1612 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1613 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1614 } 1615 1616 if (!RewriteBytecodes) { 1617 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1618 } 1619 } 1620 1621 // Aggressive optimization flags -XX:+AggressiveOpts 1622 void Arguments::set_aggressive_opts_flags() { 1623 #ifdef COMPILER2 1624 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1625 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1626 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1627 } 1628 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1629 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1630 } 1631 1632 // Feed the cache size setting into the JDK 1633 char buffer[1024]; 1634 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1635 add_property(buffer); 1636 } 1637 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1638 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1639 } 1640 #endif 1641 1642 if (AggressiveOpts) { 1643 // Sample flag setting code 1644 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1645 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1646 // } 1647 } 1648 } 1649 1650 //=========================================================================================================== 1651 // Parsing of java.compiler property 1652 1653 void Arguments::process_java_compiler_argument(char* arg) { 1654 // For backwards compatibility, Djava.compiler=NONE or "" 1655 // causes us to switch to -Xint mode UNLESS -Xdebug 1656 // is also specified. 1657 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1658 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1659 } 1660 } 1661 1662 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1663 _sun_java_launcher = strdup(launcher); 1664 if (strcmp("gamma", _sun_java_launcher) == 0) { 1665 _created_by_gamma_launcher = true; 1666 } 1667 } 1668 1669 bool Arguments::created_by_java_launcher() { 1670 assert(_sun_java_launcher != NULL, "property must have value"); 1671 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1672 } 1673 1674 bool Arguments::created_by_gamma_launcher() { 1675 return _created_by_gamma_launcher; 1676 } 1677 1678 //=========================================================================================================== 1679 // Parsing of main arguments 1680 1681 bool Arguments::verify_interval(uintx val, uintx min, 1682 uintx max, const char* name) { 1683 // Returns true iff value is in the inclusive interval [min..max] 1684 // false, otherwise. 1685 if (val >= min && val <= max) { 1686 return true; 1687 } 1688 jio_fprintf(defaultStream::error_stream(), 1689 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1690 " and " UINTX_FORMAT "\n", 1691 name, val, min, max); 1692 return false; 1693 } 1694 1695 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1696 // Returns true if given value is at least specified min threshold 1697 // false, otherwise. 1698 if (val >= min ) { 1699 return true; 1700 } 1701 jio_fprintf(defaultStream::error_stream(), 1702 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1703 name, val, min); 1704 return false; 1705 } 1706 1707 bool Arguments::verify_percentage(uintx value, const char* name) { 1708 if (value <= 100) { 1709 return true; 1710 } 1711 jio_fprintf(defaultStream::error_stream(), 1712 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1713 name, value); 1714 return false; 1715 } 1716 1717 static void force_serial_gc() { 1718 FLAG_SET_DEFAULT(UseSerialGC, true); 1719 FLAG_SET_DEFAULT(UseParNewGC, false); 1720 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1721 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1722 FLAG_SET_DEFAULT(UseParallelGC, false); 1723 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1724 FLAG_SET_DEFAULT(UseG1GC, false); 1725 } 1726 1727 static bool verify_serial_gc_flags() { 1728 return (UseSerialGC && 1729 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1730 UseParallelGC || UseParallelOldGC)); 1731 } 1732 1733 // check if do gclog rotation 1734 // +UseGCLogFileRotation is a must, 1735 // no gc log rotation when log file not supplied or 1736 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1737 void check_gclog_consistency() { 1738 if (UseGCLogFileRotation) { 1739 if ((Arguments::gc_log_filename() == NULL) || 1740 (NumberOfGCLogFiles == 0) || 1741 (GCLogFileSize == 0)) { 1742 jio_fprintf(defaultStream::output_stream(), 1743 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1744 "where num_of_file > 0 and num_of_size > 0\n" 1745 "GC log rotation is turned off\n"); 1746 UseGCLogFileRotation = false; 1747 } 1748 } 1749 1750 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1751 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1752 jio_fprintf(defaultStream::output_stream(), 1753 "GCLogFileSize changed to minimum 8K\n"); 1754 } 1755 } 1756 1757 // Check consistency of GC selection 1758 bool Arguments::check_gc_consistency() { 1759 check_gclog_consistency(); 1760 bool status = true; 1761 // Ensure that the user has not selected conflicting sets 1762 // of collectors. [Note: this check is merely a user convenience; 1763 // collectors over-ride each other so that only a non-conflicting 1764 // set is selected; however what the user gets is not what they 1765 // may have expected from the combination they asked for. It's 1766 // better to reduce user confusion by not allowing them to 1767 // select conflicting combinations. 1768 uint i = 0; 1769 if (UseSerialGC) i++; 1770 if (UseConcMarkSweepGC || UseParNewGC) i++; 1771 if (UseParallelGC || UseParallelOldGC) i++; 1772 if (UseG1GC) i++; 1773 if (i > 1) { 1774 jio_fprintf(defaultStream::error_stream(), 1775 "Conflicting collector combinations in option list; " 1776 "please refer to the release notes for the combinations " 1777 "allowed\n"); 1778 status = false; 1779 } 1780 1781 return status; 1782 } 1783 1784 // Check stack pages settings 1785 bool Arguments::check_stack_pages() 1786 { 1787 bool status = true; 1788 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1789 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1790 // greater stack shadow pages can't generate instruction to bang stack 1791 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1792 return status; 1793 } 1794 1795 // Check the consistency of vm_init_args 1796 bool Arguments::check_vm_args_consistency() { 1797 // Method for adding checks for flag consistency. 1798 // The intent is to warn the user of all possible conflicts, 1799 // before returning an error. 1800 // Note: Needs platform-dependent factoring. 1801 bool status = true; 1802 1803 #if ( (defined(COMPILER2) && defined(SPARC))) 1804 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1805 // on sparc doesn't require generation of a stub as is the case on, e.g., 1806 // x86. Normally, VM_Version_init must be called from init_globals in 1807 // init.cpp, which is called by the initial java thread *after* arguments 1808 // have been parsed. VM_Version_init gets called twice on sparc. 1809 extern void VM_Version_init(); 1810 VM_Version_init(); 1811 if (!VM_Version::has_v9()) { 1812 jio_fprintf(defaultStream::error_stream(), 1813 "V8 Machine detected, Server requires V9\n"); 1814 status = false; 1815 } 1816 #endif /* COMPILER2 && SPARC */ 1817 1818 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1819 // builds so the cost of stack banging can be measured. 1820 #if (defined(PRODUCT) && defined(SOLARIS)) 1821 if (!UseBoundThreads && !UseStackBanging) { 1822 jio_fprintf(defaultStream::error_stream(), 1823 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1824 1825 status = false; 1826 } 1827 #endif 1828 1829 if (TLABRefillWasteFraction == 0) { 1830 jio_fprintf(defaultStream::error_stream(), 1831 "TLABRefillWasteFraction should be a denominator, " 1832 "not " SIZE_FORMAT "\n", 1833 TLABRefillWasteFraction); 1834 status = false; 1835 } 1836 1837 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1838 "AdaptiveSizePolicyWeight"); 1839 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1840 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1841 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1842 1843 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1844 jio_fprintf(defaultStream::error_stream(), 1845 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1846 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1847 MinHeapFreeRatio, MaxHeapFreeRatio); 1848 status = false; 1849 } 1850 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1851 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1852 1853 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1854 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1855 } 1856 1857 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1858 // Settings to encourage splitting. 1859 if (!FLAG_IS_CMDLINE(NewRatio)) { 1860 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1861 } 1862 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1863 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1864 } 1865 } 1866 1867 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1868 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1869 if (GCTimeLimit == 100) { 1870 // Turn off gc-overhead-limit-exceeded checks 1871 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1872 } 1873 1874 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1875 1876 status = status && check_gc_consistency(); 1877 status = status && check_stack_pages(); 1878 1879 if (_has_alloc_profile) { 1880 if (UseParallelGC || UseParallelOldGC) { 1881 jio_fprintf(defaultStream::error_stream(), 1882 "error: invalid argument combination.\n" 1883 "Allocation profiling (-Xaprof) cannot be used together with " 1884 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1885 status = false; 1886 } 1887 if (UseConcMarkSweepGC) { 1888 jio_fprintf(defaultStream::error_stream(), 1889 "error: invalid argument combination.\n" 1890 "Allocation profiling (-Xaprof) cannot be used together with " 1891 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1892 status = false; 1893 } 1894 } 1895 1896 if (CMSIncrementalMode) { 1897 if (!UseConcMarkSweepGC) { 1898 jio_fprintf(defaultStream::error_stream(), 1899 "error: invalid argument combination.\n" 1900 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1901 "selected in order\nto use CMSIncrementalMode.\n"); 1902 status = false; 1903 } else { 1904 status = status && verify_percentage(CMSIncrementalDutyCycle, 1905 "CMSIncrementalDutyCycle"); 1906 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1907 "CMSIncrementalDutyCycleMin"); 1908 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1909 "CMSIncrementalSafetyFactor"); 1910 status = status && verify_percentage(CMSIncrementalOffset, 1911 "CMSIncrementalOffset"); 1912 status = status && verify_percentage(CMSExpAvgFactor, 1913 "CMSExpAvgFactor"); 1914 // If it was not set on the command line, set 1915 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1916 if (CMSInitiatingOccupancyFraction < 0) { 1917 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1918 } 1919 } 1920 } 1921 1922 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1923 // insists that we hold the requisite locks so that the iteration is 1924 // MT-safe. For the verification at start-up and shut-down, we don't 1925 // yet have a good way of acquiring and releasing these locks, 1926 // which are not visible at the CollectedHeap level. We want to 1927 // be able to acquire these locks and then do the iteration rather 1928 // than just disable the lock verification. This will be fixed under 1929 // bug 4788986. 1930 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1931 if (VerifyGCStartAt == 0) { 1932 warning("Heap verification at start-up disabled " 1933 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1934 VerifyGCStartAt = 1; // Disable verification at start-up 1935 } 1936 if (VerifyBeforeExit) { 1937 warning("Heap verification at shutdown disabled " 1938 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1939 VerifyBeforeExit = false; // Disable verification at shutdown 1940 } 1941 } 1942 1943 // Note: only executed in non-PRODUCT mode 1944 if (!UseAsyncConcMarkSweepGC && 1945 (ExplicitGCInvokesConcurrent || 1946 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1947 jio_fprintf(defaultStream::error_stream(), 1948 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1949 " with -UseAsyncConcMarkSweepGC"); 1950 status = false; 1951 } 1952 1953 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 1954 1955 #ifndef SERIALGC 1956 if (UseG1GC) { 1957 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1958 "InitiatingHeapOccupancyPercent"); 1959 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1960 "G1RefProcDrainInterval"); 1961 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1962 "G1ConcMarkStepDurationMillis"); 1963 } 1964 #endif 1965 1966 status = status && verify_interval(RefDiscoveryPolicy, 1967 ReferenceProcessor::DiscoveryPolicyMin, 1968 ReferenceProcessor::DiscoveryPolicyMax, 1969 "RefDiscoveryPolicy"); 1970 1971 // Limit the lower bound of this flag to 1 as it is used in a division 1972 // expression. 1973 status = status && verify_interval(TLABWasteTargetPercent, 1974 1, 100, "TLABWasteTargetPercent"); 1975 1976 status = status && verify_object_alignment(); 1977 1978 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 1979 "ClassMetaspaceSize"); 1980 1981 return status; 1982 } 1983 1984 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1985 const char* option_type) { 1986 if (ignore) return false; 1987 1988 const char* spacer = " "; 1989 if (option_type == NULL) { 1990 option_type = ++spacer; // Set both to the empty string. 1991 } 1992 1993 if (os::obsolete_option(option)) { 1994 jio_fprintf(defaultStream::error_stream(), 1995 "Obsolete %s%soption: %s\n", option_type, spacer, 1996 option->optionString); 1997 return false; 1998 } else { 1999 jio_fprintf(defaultStream::error_stream(), 2000 "Unrecognized %s%soption: %s\n", option_type, spacer, 2001 option->optionString); 2002 return true; 2003 } 2004 } 2005 2006 static const char* user_assertion_options[] = { 2007 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2008 }; 2009 2010 static const char* system_assertion_options[] = { 2011 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2012 }; 2013 2014 // Return true if any of the strings in null-terminated array 'names' matches. 2015 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2016 // the option must match exactly. 2017 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2018 bool tail_allowed) { 2019 for (/* empty */; *names != NULL; ++names) { 2020 if (match_option(option, *names, tail)) { 2021 if (**tail == '\0' || tail_allowed && **tail == ':') { 2022 return true; 2023 } 2024 } 2025 } 2026 return false; 2027 } 2028 2029 bool Arguments::parse_uintx(const char* value, 2030 uintx* uintx_arg, 2031 uintx min_size) { 2032 2033 // Check the sign first since atomull() parses only unsigned values. 2034 bool value_is_positive = !(*value == '-'); 2035 2036 if (value_is_positive) { 2037 julong n; 2038 bool good_return = atomull(value, &n); 2039 if (good_return) { 2040 bool above_minimum = n >= min_size; 2041 bool value_is_too_large = n > max_uintx; 2042 2043 if (above_minimum && !value_is_too_large) { 2044 *uintx_arg = n; 2045 return true; 2046 } 2047 } 2048 } 2049 return false; 2050 } 2051 2052 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2053 julong* long_arg, 2054 julong min_size) { 2055 if (!atomull(s, long_arg)) return arg_unreadable; 2056 return check_memory_size(*long_arg, min_size); 2057 } 2058 2059 // Parse JavaVMInitArgs structure 2060 2061 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2062 // For components of the system classpath. 2063 SysClassPath scp(Arguments::get_sysclasspath()); 2064 bool scp_assembly_required = false; 2065 2066 // Save default settings for some mode flags 2067 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2068 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2069 Arguments::_ClipInlining = ClipInlining; 2070 Arguments::_BackgroundCompilation = BackgroundCompilation; 2071 2072 // Setup flags for mixed which is the default 2073 set_mode_flags(_mixed); 2074 2075 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2076 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2077 if (result != JNI_OK) { 2078 return result; 2079 } 2080 2081 // Parse JavaVMInitArgs structure passed in 2082 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2083 if (result != JNI_OK) { 2084 return result; 2085 } 2086 2087 if (AggressiveOpts) { 2088 // Insert alt-rt.jar between user-specified bootclasspath 2089 // prefix and the default bootclasspath. os::set_boot_path() 2090 // uses meta_index_dir as the default bootclasspath directory. 2091 const char* altclasses_jar = "alt-rt.jar"; 2092 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2093 strlen(altclasses_jar); 2094 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2095 strcpy(altclasses_path, get_meta_index_dir()); 2096 strcat(altclasses_path, altclasses_jar); 2097 scp.add_suffix_to_prefix(altclasses_path); 2098 scp_assembly_required = true; 2099 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2100 } 2101 2102 if (WhiteBoxAPI) { 2103 // Append wb.jar to bootclasspath if enabled 2104 const char* wb_jar = "wb.jar"; 2105 size_t wb_path_len = strlen(get_meta_index_dir()) + 1 + 2106 strlen(wb_jar); 2107 char* wb_path = NEW_C_HEAP_ARRAY(char, wb_path_len, mtInternal); 2108 strcpy(wb_path, get_meta_index_dir()); 2109 strcat(wb_path, wb_jar); 2110 scp.add_suffix(wb_path); 2111 scp_assembly_required = true; 2112 FREE_C_HEAP_ARRAY(char, wb_path, mtInternal); 2113 } 2114 2115 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2116 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2117 if (result != JNI_OK) { 2118 return result; 2119 } 2120 2121 // Do final processing now that all arguments have been parsed 2122 result = finalize_vm_init_args(&scp, scp_assembly_required); 2123 if (result != JNI_OK) { 2124 return result; 2125 } 2126 2127 return JNI_OK; 2128 } 2129 2130 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2131 SysClassPath* scp_p, 2132 bool* scp_assembly_required_p, 2133 FlagValueOrigin origin) { 2134 // Remaining part of option string 2135 const char* tail; 2136 2137 // iterate over arguments 2138 for (int index = 0; index < args->nOptions; index++) { 2139 bool is_absolute_path = false; // for -agentpath vs -agentlib 2140 2141 const JavaVMOption* option = args->options + index; 2142 2143 if (!match_option(option, "-Djava.class.path", &tail) && 2144 !match_option(option, "-Dsun.java.command", &tail) && 2145 !match_option(option, "-Dsun.java.launcher", &tail)) { 2146 2147 // add all jvm options to the jvm_args string. This string 2148 // is used later to set the java.vm.args PerfData string constant. 2149 // the -Djava.class.path and the -Dsun.java.command options are 2150 // omitted from jvm_args string as each have their own PerfData 2151 // string constant object. 2152 build_jvm_args(option->optionString); 2153 } 2154 2155 // -verbose:[class/gc/jni] 2156 if (match_option(option, "-verbose", &tail)) { 2157 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2158 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2159 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2160 } else if (!strcmp(tail, ":gc")) { 2161 FLAG_SET_CMDLINE(bool, PrintGC, true); 2162 } else if (!strcmp(tail, ":jni")) { 2163 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2164 } 2165 // -da / -ea / -disableassertions / -enableassertions 2166 // These accept an optional class/package name separated by a colon, e.g., 2167 // -da:java.lang.Thread. 2168 } else if (match_option(option, user_assertion_options, &tail, true)) { 2169 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2170 if (*tail == '\0') { 2171 JavaAssertions::setUserClassDefault(enable); 2172 } else { 2173 assert(*tail == ':', "bogus match by match_option()"); 2174 JavaAssertions::addOption(tail + 1, enable); 2175 } 2176 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2177 } else if (match_option(option, system_assertion_options, &tail, false)) { 2178 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2179 JavaAssertions::setSystemClassDefault(enable); 2180 // -bootclasspath: 2181 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2182 scp_p->reset_path(tail); 2183 *scp_assembly_required_p = true; 2184 // -bootclasspath/a: 2185 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2186 scp_p->add_suffix(tail); 2187 *scp_assembly_required_p = true; 2188 // -bootclasspath/p: 2189 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2190 scp_p->add_prefix(tail); 2191 *scp_assembly_required_p = true; 2192 // -Xrun 2193 } else if (match_option(option, "-Xrun", &tail)) { 2194 if (tail != NULL) { 2195 const char* pos = strchr(tail, ':'); 2196 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2197 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2198 name[len] = '\0'; 2199 2200 char *options = NULL; 2201 if(pos != NULL) { 2202 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2203 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2204 } 2205 #if !INCLUDE_JVMTI 2206 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2207 warning("profiling and debugging agents are not supported in this VM"); 2208 } else 2209 #endif // !INCLUDE_JVMTI 2210 add_init_library(name, options); 2211 } 2212 // -agentlib and -agentpath 2213 } else if (match_option(option, "-agentlib:", &tail) || 2214 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2215 if(tail != NULL) { 2216 const char* pos = strchr(tail, '='); 2217 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2218 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2219 name[len] = '\0'; 2220 2221 char *options = NULL; 2222 if(pos != NULL) { 2223 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2224 } 2225 #if !INCLUDE_JVMTI 2226 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2227 warning("profiling and debugging agents are not supported in this VM"); 2228 } else 2229 #endif // !INCLUDE_JVMTI 2230 add_init_agent(name, options, is_absolute_path); 2231 2232 } 2233 // -javaagent 2234 } else if (match_option(option, "-javaagent:", &tail)) { 2235 #if !INCLUDE_JVMTI 2236 warning("Instrumentation agents are not supported in this VM"); 2237 #else 2238 if(tail != NULL) { 2239 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2240 add_init_agent("instrument", options, false); 2241 } 2242 #endif // !INCLUDE_JVMTI 2243 // -Xnoclassgc 2244 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2245 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2246 // -Xincgc: i-CMS 2247 } else if (match_option(option, "-Xincgc", &tail)) { 2248 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2249 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2250 // -Xnoincgc: no i-CMS 2251 } else if (match_option(option, "-Xnoincgc", &tail)) { 2252 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2253 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2254 // -Xconcgc 2255 } else if (match_option(option, "-Xconcgc", &tail)) { 2256 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2257 // -Xnoconcgc 2258 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2259 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2260 // -Xbatch 2261 } else if (match_option(option, "-Xbatch", &tail)) { 2262 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2263 // -Xmn for compatibility with other JVM vendors 2264 } else if (match_option(option, "-Xmn", &tail)) { 2265 julong long_initial_eden_size = 0; 2266 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2267 if (errcode != arg_in_range) { 2268 jio_fprintf(defaultStream::error_stream(), 2269 "Invalid initial eden size: %s\n", option->optionString); 2270 describe_range_error(errcode); 2271 return JNI_EINVAL; 2272 } 2273 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2274 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2275 // -Xms 2276 } else if (match_option(option, "-Xms", &tail)) { 2277 julong long_initial_heap_size = 0; 2278 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2279 if (errcode != arg_in_range) { 2280 jio_fprintf(defaultStream::error_stream(), 2281 "Invalid initial heap size: %s\n", option->optionString); 2282 describe_range_error(errcode); 2283 return JNI_EINVAL; 2284 } 2285 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2286 // Currently the minimum size and the initial heap sizes are the same. 2287 set_min_heap_size(InitialHeapSize); 2288 // -Xmx 2289 } else if (match_option(option, "-Xmx", &tail)) { 2290 julong long_max_heap_size = 0; 2291 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2292 if (errcode != arg_in_range) { 2293 jio_fprintf(defaultStream::error_stream(), 2294 "Invalid maximum heap size: %s\n", option->optionString); 2295 describe_range_error(errcode); 2296 return JNI_EINVAL; 2297 } 2298 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2299 // Xmaxf 2300 } else if (match_option(option, "-Xmaxf", &tail)) { 2301 int maxf = (int)(atof(tail) * 100); 2302 if (maxf < 0 || maxf > 100) { 2303 jio_fprintf(defaultStream::error_stream(), 2304 "Bad max heap free percentage size: %s\n", 2305 option->optionString); 2306 return JNI_EINVAL; 2307 } else { 2308 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2309 } 2310 // Xminf 2311 } else if (match_option(option, "-Xminf", &tail)) { 2312 int minf = (int)(atof(tail) * 100); 2313 if (minf < 0 || minf > 100) { 2314 jio_fprintf(defaultStream::error_stream(), 2315 "Bad min heap free percentage size: %s\n", 2316 option->optionString); 2317 return JNI_EINVAL; 2318 } else { 2319 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2320 } 2321 // -Xss 2322 } else if (match_option(option, "-Xss", &tail)) { 2323 julong long_ThreadStackSize = 0; 2324 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2325 if (errcode != arg_in_range) { 2326 jio_fprintf(defaultStream::error_stream(), 2327 "Invalid thread stack size: %s\n", option->optionString); 2328 describe_range_error(errcode); 2329 return JNI_EINVAL; 2330 } 2331 // Internally track ThreadStackSize in units of 1024 bytes. 2332 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2333 round_to((int)long_ThreadStackSize, K) / K); 2334 // -Xoss 2335 } else if (match_option(option, "-Xoss", &tail)) { 2336 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2337 // -Xmaxjitcodesize 2338 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2339 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2340 julong long_ReservedCodeCacheSize = 0; 2341 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2342 (size_t)InitialCodeCacheSize); 2343 if (errcode != arg_in_range) { 2344 jio_fprintf(defaultStream::error_stream(), 2345 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2346 option->optionString, InitialCodeCacheSize/K); 2347 describe_range_error(errcode); 2348 return JNI_EINVAL; 2349 } 2350 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2351 // -green 2352 } else if (match_option(option, "-green", &tail)) { 2353 jio_fprintf(defaultStream::error_stream(), 2354 "Green threads support not available\n"); 2355 return JNI_EINVAL; 2356 // -native 2357 } else if (match_option(option, "-native", &tail)) { 2358 // HotSpot always uses native threads, ignore silently for compatibility 2359 // -Xsqnopause 2360 } else if (match_option(option, "-Xsqnopause", &tail)) { 2361 // EVM option, ignore silently for compatibility 2362 // -Xrs 2363 } else if (match_option(option, "-Xrs", &tail)) { 2364 // Classic/EVM option, new functionality 2365 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2366 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2367 // change default internal VM signals used - lower case for back compat 2368 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2369 // -Xoptimize 2370 } else if (match_option(option, "-Xoptimize", &tail)) { 2371 // EVM option, ignore silently for compatibility 2372 // -Xprof 2373 } else if (match_option(option, "-Xprof", &tail)) { 2374 #if INCLUDE_FPROF 2375 _has_profile = true; 2376 #else // INCLUDE_FPROF 2377 // do we have to exit? 2378 warning("Flat profiling is not supported in this VM."); 2379 #endif // INCLUDE_FPROF 2380 // -Xaprof 2381 } else if (match_option(option, "-Xaprof", &tail)) { 2382 _has_alloc_profile = true; 2383 // -Xconcurrentio 2384 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2385 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2386 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2387 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2388 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2389 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2390 2391 // -Xinternalversion 2392 } else if (match_option(option, "-Xinternalversion", &tail)) { 2393 jio_fprintf(defaultStream::output_stream(), "%s\n", 2394 VM_Version::internal_vm_info_string()); 2395 vm_exit(0); 2396 #ifndef PRODUCT 2397 // -Xprintflags 2398 } else if (match_option(option, "-Xprintflags", &tail)) { 2399 CommandLineFlags::printFlags(tty, false); 2400 vm_exit(0); 2401 #endif 2402 // -D 2403 } else if (match_option(option, "-D", &tail)) { 2404 if (!add_property(tail)) { 2405 return JNI_ENOMEM; 2406 } 2407 // Out of the box management support 2408 if (match_option(option, "-Dcom.sun.management", &tail)) { 2409 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2410 } 2411 // -Xint 2412 } else if (match_option(option, "-Xint", &tail)) { 2413 set_mode_flags(_int); 2414 // -Xmixed 2415 } else if (match_option(option, "-Xmixed", &tail)) { 2416 set_mode_flags(_mixed); 2417 // -Xcomp 2418 } else if (match_option(option, "-Xcomp", &tail)) { 2419 // for testing the compiler; turn off all flags that inhibit compilation 2420 set_mode_flags(_comp); 2421 2422 // -Xshare:dump 2423 } else if (match_option(option, "-Xshare:dump", &tail)) { 2424 #if defined(KERNEL) 2425 vm_exit_during_initialization( 2426 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2427 #elif !INCLUDE_CDS 2428 vm_exit_during_initialization( 2429 "Dumping a shared archive is not supported in this VM.", NULL); 2430 #else 2431 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2432 set_mode_flags(_int); // Prevent compilation, which creates objects 2433 #endif 2434 // -Xshare:on 2435 } else if (match_option(option, "-Xshare:on", &tail)) { 2436 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2437 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2438 // -Xshare:auto 2439 } else if (match_option(option, "-Xshare:auto", &tail)) { 2440 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2441 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2442 // -Xshare:off 2443 } else if (match_option(option, "-Xshare:off", &tail)) { 2444 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2445 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2446 2447 // -Xverify 2448 } else if (match_option(option, "-Xverify", &tail)) { 2449 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2450 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2451 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2452 } else if (strcmp(tail, ":remote") == 0) { 2453 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2454 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2455 } else if (strcmp(tail, ":none") == 0) { 2456 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2457 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2458 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2459 return JNI_EINVAL; 2460 } 2461 // -Xdebug 2462 } else if (match_option(option, "-Xdebug", &tail)) { 2463 // note this flag has been used, then ignore 2464 set_xdebug_mode(true); 2465 // -Xnoagent 2466 } else if (match_option(option, "-Xnoagent", &tail)) { 2467 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2468 } else if (match_option(option, "-Xboundthreads", &tail)) { 2469 // Bind user level threads to kernel threads (Solaris only) 2470 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2471 } else if (match_option(option, "-Xloggc:", &tail)) { 2472 // Redirect GC output to the file. -Xloggc:<filename> 2473 // ostream_init_log(), when called will use this filename 2474 // to initialize a fileStream. 2475 _gc_log_filename = strdup(tail); 2476 FLAG_SET_CMDLINE(bool, PrintGC, true); 2477 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2478 2479 // JNI hooks 2480 } else if (match_option(option, "-Xcheck", &tail)) { 2481 if (!strcmp(tail, ":jni")) { 2482 #if !INCLUDE_JNI_CHECK 2483 warning("JNI CHECKING is not supported in this VM"); 2484 #else 2485 CheckJNICalls = true; 2486 #endif // INCLUDE_JNI_CHECK 2487 } else if (is_bad_option(option, args->ignoreUnrecognized, 2488 "check")) { 2489 return JNI_EINVAL; 2490 } 2491 } else if (match_option(option, "vfprintf", &tail)) { 2492 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2493 } else if (match_option(option, "exit", &tail)) { 2494 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2495 } else if (match_option(option, "abort", &tail)) { 2496 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2497 // -XX:+AggressiveHeap 2498 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2499 2500 // This option inspects the machine and attempts to set various 2501 // parameters to be optimal for long-running, memory allocation 2502 // intensive jobs. It is intended for machines with large 2503 // amounts of cpu and memory. 2504 2505 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2506 // VM, but we may not be able to represent the total physical memory 2507 // available (like having 8gb of memory on a box but using a 32bit VM). 2508 // Thus, we need to make sure we're using a julong for intermediate 2509 // calculations. 2510 julong initHeapSize; 2511 julong total_memory = os::physical_memory(); 2512 2513 if (total_memory < (julong)256*M) { 2514 jio_fprintf(defaultStream::error_stream(), 2515 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2516 vm_exit(1); 2517 } 2518 2519 // The heap size is half of available memory, or (at most) 2520 // all of possible memory less 160mb (leaving room for the OS 2521 // when using ISM). This is the maximum; because adaptive sizing 2522 // is turned on below, the actual space used may be smaller. 2523 2524 initHeapSize = MIN2(total_memory / (julong)2, 2525 total_memory - (julong)160*M); 2526 2527 // Make sure that if we have a lot of memory we cap the 32 bit 2528 // process space. The 64bit VM version of this function is a nop. 2529 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2530 2531 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2532 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2533 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2534 // Currently the minimum size and the initial heap sizes are the same. 2535 set_min_heap_size(initHeapSize); 2536 } 2537 if (FLAG_IS_DEFAULT(NewSize)) { 2538 // Make the young generation 3/8ths of the total heap. 2539 FLAG_SET_CMDLINE(uintx, NewSize, 2540 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2541 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2542 } 2543 2544 FLAG_SET_DEFAULT(UseLargePages, true); 2545 2546 // Increase some data structure sizes for efficiency 2547 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2548 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2549 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2550 2551 // See the OldPLABSize comment below, but replace 'after promotion' 2552 // with 'after copying'. YoungPLABSize is the size of the survivor 2553 // space per-gc-thread buffers. The default is 4kw. 2554 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2555 2556 // OldPLABSize is the size of the buffers in the old gen that 2557 // UseParallelGC uses to promote live data that doesn't fit in the 2558 // survivor spaces. At any given time, there's one for each gc thread. 2559 // The default size is 1kw. These buffers are rarely used, since the 2560 // survivor spaces are usually big enough. For specjbb, however, there 2561 // are occasions when there's lots of live data in the young gen 2562 // and we end up promoting some of it. We don't have a definite 2563 // explanation for why bumping OldPLABSize helps, but the theory 2564 // is that a bigger PLAB results in retaining something like the 2565 // original allocation order after promotion, which improves mutator 2566 // locality. A minor effect may be that larger PLABs reduce the 2567 // number of PLAB allocation events during gc. The value of 8kw 2568 // was arrived at by experimenting with specjbb. 2569 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2570 2571 // Enable parallel GC and adaptive generation sizing 2572 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2573 FLAG_SET_DEFAULT(ParallelGCThreads, 2574 Abstract_VM_Version::parallel_worker_threads()); 2575 2576 // Encourage steady state memory management 2577 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2578 2579 // This appears to improve mutator locality 2580 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2581 2582 // Get around early Solaris scheduling bug 2583 // (affinity vs other jobs on system) 2584 // but disallow DR and offlining (5008695). 2585 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2586 2587 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2588 // The last option must always win. 2589 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2590 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2591 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2592 // The last option must always win. 2593 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2594 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2595 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2596 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2597 jio_fprintf(defaultStream::error_stream(), 2598 "Please use CMSClassUnloadingEnabled in place of " 2599 "CMSPermGenSweepingEnabled in the future\n"); 2600 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2601 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2602 jio_fprintf(defaultStream::error_stream(), 2603 "Please use -XX:+UseGCOverheadLimit in place of " 2604 "-XX:+UseGCTimeLimit in the future\n"); 2605 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2606 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2607 jio_fprintf(defaultStream::error_stream(), 2608 "Please use -XX:-UseGCOverheadLimit in place of " 2609 "-XX:-UseGCTimeLimit in the future\n"); 2610 // The TLE options are for compatibility with 1.3 and will be 2611 // removed without notice in a future release. These options 2612 // are not to be documented. 2613 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2614 // No longer used. 2615 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2616 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2617 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2618 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2619 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2620 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2621 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2622 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2623 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2624 // No longer used. 2625 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2626 julong long_tlab_size = 0; 2627 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2628 if (errcode != arg_in_range) { 2629 jio_fprintf(defaultStream::error_stream(), 2630 "Invalid TLAB size: %s\n", option->optionString); 2631 describe_range_error(errcode); 2632 return JNI_EINVAL; 2633 } 2634 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2635 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2636 // No longer used. 2637 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2638 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2639 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2640 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2641 SOLARIS_ONLY( 2642 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2643 warning("-XX:+UsePermISM is obsolete."); 2644 FLAG_SET_CMDLINE(bool, UseISM, true); 2645 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2646 FLAG_SET_CMDLINE(bool, UseISM, false); 2647 ) 2648 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2649 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2650 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2651 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2652 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2653 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2654 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2655 #if defined(DTRACE_ENABLED) 2656 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2657 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2658 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2659 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2660 #else // defined(DTRACE_ENABLED) 2661 jio_fprintf(defaultStream::error_stream(), 2662 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2663 return JNI_EINVAL; 2664 #endif // defined(DTRACE_ENABLED) 2665 #ifdef ASSERT 2666 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2667 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2668 // disable scavenge before parallel mark-compact 2669 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2670 #endif 2671 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2672 julong cms_blocks_to_claim = (julong)atol(tail); 2673 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2674 jio_fprintf(defaultStream::error_stream(), 2675 "Please use -XX:OldPLABSize in place of " 2676 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2677 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2678 julong cms_blocks_to_claim = (julong)atol(tail); 2679 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2680 jio_fprintf(defaultStream::error_stream(), 2681 "Please use -XX:OldPLABSize in place of " 2682 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2683 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2684 julong old_plab_size = 0; 2685 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2686 if (errcode != arg_in_range) { 2687 jio_fprintf(defaultStream::error_stream(), 2688 "Invalid old PLAB size: %s\n", option->optionString); 2689 describe_range_error(errcode); 2690 return JNI_EINVAL; 2691 } 2692 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2693 jio_fprintf(defaultStream::error_stream(), 2694 "Please use -XX:OldPLABSize in place of " 2695 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2696 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2697 julong young_plab_size = 0; 2698 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2699 if (errcode != arg_in_range) { 2700 jio_fprintf(defaultStream::error_stream(), 2701 "Invalid young PLAB size: %s\n", option->optionString); 2702 describe_range_error(errcode); 2703 return JNI_EINVAL; 2704 } 2705 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2706 jio_fprintf(defaultStream::error_stream(), 2707 "Please use -XX:YoungPLABSize in place of " 2708 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2709 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2710 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2711 julong stack_size = 0; 2712 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2713 if (errcode != arg_in_range) { 2714 jio_fprintf(defaultStream::error_stream(), 2715 "Invalid mark stack size: %s\n", option->optionString); 2716 describe_range_error(errcode); 2717 return JNI_EINVAL; 2718 } 2719 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2720 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2721 julong max_stack_size = 0; 2722 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2723 if (errcode != arg_in_range) { 2724 jio_fprintf(defaultStream::error_stream(), 2725 "Invalid maximum mark stack size: %s\n", 2726 option->optionString); 2727 describe_range_error(errcode); 2728 return JNI_EINVAL; 2729 } 2730 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2731 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2732 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2733 uintx conc_threads = 0; 2734 if (!parse_uintx(tail, &conc_threads, 1)) { 2735 jio_fprintf(defaultStream::error_stream(), 2736 "Invalid concurrent threads: %s\n", option->optionString); 2737 return JNI_EINVAL; 2738 } 2739 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2740 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 2741 julong max_direct_memory_size = 0; 2742 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 2743 if (errcode != arg_in_range) { 2744 jio_fprintf(defaultStream::error_stream(), 2745 "Invalid maximum direct memory size: %s\n", 2746 option->optionString); 2747 describe_range_error(errcode); 2748 return JNI_EINVAL; 2749 } 2750 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 2751 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2752 // Skip -XX:Flags= since that case has already been handled 2753 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2754 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2755 return JNI_EINVAL; 2756 } 2757 } 2758 // Unknown option 2759 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2760 return JNI_ERR; 2761 } 2762 } 2763 2764 // Change the default value for flags which have different default values 2765 // when working with older JDKs. 2766 if (JDK_Version::current().compare_major(6) <= 0 && 2767 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2768 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2769 } 2770 #ifdef LINUX 2771 if (JDK_Version::current().compare_major(6) <= 0 && 2772 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2773 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2774 } 2775 #endif // LINUX 2776 return JNI_OK; 2777 } 2778 2779 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2780 // This must be done after all -D arguments have been processed. 2781 scp_p->expand_endorsed(); 2782 2783 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2784 // Assemble the bootclasspath elements into the final path. 2785 Arguments::set_sysclasspath(scp_p->combined_path()); 2786 } 2787 2788 // This must be done after all arguments have been processed. 2789 // java_compiler() true means set to "NONE" or empty. 2790 if (java_compiler() && !xdebug_mode()) { 2791 // For backwards compatibility, we switch to interpreted mode if 2792 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2793 // not specified. 2794 set_mode_flags(_int); 2795 } 2796 if (CompileThreshold == 0) { 2797 set_mode_flags(_int); 2798 } 2799 2800 #ifndef COMPILER2 2801 // Don't degrade server performance for footprint 2802 if (FLAG_IS_DEFAULT(UseLargePages) && 2803 MaxHeapSize < LargePageHeapSizeThreshold) { 2804 // No need for large granularity pages w/small heaps. 2805 // Note that large pages are enabled/disabled for both the 2806 // Java heap and the code cache. 2807 FLAG_SET_DEFAULT(UseLargePages, false); 2808 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2809 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2810 } 2811 2812 // Tiered compilation is undefined with C1. 2813 TieredCompilation = false; 2814 #else 2815 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2816 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2817 } 2818 #endif 2819 2820 // If we are running in a headless jre, force java.awt.headless property 2821 // to be true unless the property has already been set. 2822 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2823 if (os::is_headless_jre()) { 2824 const char* headless = Arguments::get_property("java.awt.headless"); 2825 if (headless == NULL) { 2826 char envbuffer[128]; 2827 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2828 if (!add_property("java.awt.headless=true")) { 2829 return JNI_ENOMEM; 2830 } 2831 } else { 2832 char buffer[256]; 2833 strcpy(buffer, "java.awt.headless="); 2834 strcat(buffer, envbuffer); 2835 if (!add_property(buffer)) { 2836 return JNI_ENOMEM; 2837 } 2838 } 2839 } 2840 } 2841 2842 if (!check_vm_args_consistency()) { 2843 return JNI_ERR; 2844 } 2845 2846 return JNI_OK; 2847 } 2848 2849 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2850 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2851 scp_assembly_required_p); 2852 } 2853 2854 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2855 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2856 scp_assembly_required_p); 2857 } 2858 2859 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2860 const int N_MAX_OPTIONS = 64; 2861 const int OPTION_BUFFER_SIZE = 1024; 2862 char buffer[OPTION_BUFFER_SIZE]; 2863 2864 // The variable will be ignored if it exceeds the length of the buffer. 2865 // Don't check this variable if user has special privileges 2866 // (e.g. unix su command). 2867 if (os::getenv(name, buffer, sizeof(buffer)) && 2868 !os::have_special_privileges()) { 2869 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2870 jio_fprintf(defaultStream::error_stream(), 2871 "Picked up %s: %s\n", name, buffer); 2872 char* rd = buffer; // pointer to the input string (rd) 2873 int i; 2874 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2875 while (isspace(*rd)) rd++; // skip whitespace 2876 if (*rd == 0) break; // we re done when the input string is read completely 2877 2878 // The output, option string, overwrites the input string. 2879 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2880 // input string (rd). 2881 char* wrt = rd; 2882 2883 options[i++].optionString = wrt; // Fill in option 2884 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2885 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2886 int quote = *rd; // matching quote to look for 2887 rd++; // don't copy open quote 2888 while (*rd != quote) { // include everything (even spaces) up until quote 2889 if (*rd == 0) { // string termination means unmatched string 2890 jio_fprintf(defaultStream::error_stream(), 2891 "Unmatched quote in %s\n", name); 2892 return JNI_ERR; 2893 } 2894 *wrt++ = *rd++; // copy to option string 2895 } 2896 rd++; // don't copy close quote 2897 } else { 2898 *wrt++ = *rd++; // copy to option string 2899 } 2900 } 2901 // Need to check if we're done before writing a NULL, 2902 // because the write could be to the byte that rd is pointing to. 2903 if (*rd++ == 0) { 2904 *wrt = 0; 2905 break; 2906 } 2907 *wrt = 0; // Zero terminate option 2908 } 2909 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2910 JavaVMInitArgs vm_args; 2911 vm_args.version = JNI_VERSION_1_2; 2912 vm_args.options = options; 2913 vm_args.nOptions = i; 2914 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2915 2916 if (PrintVMOptions) { 2917 const char* tail; 2918 for (int i = 0; i < vm_args.nOptions; i++) { 2919 const JavaVMOption *option = vm_args.options + i; 2920 if (match_option(option, "-XX:", &tail)) { 2921 logOption(tail); 2922 } 2923 } 2924 } 2925 2926 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2927 } 2928 return JNI_OK; 2929 } 2930 2931 void Arguments::set_shared_spaces_flags() { 2932 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 2933 const bool might_share = must_share || UseSharedSpaces; 2934 2935 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 2936 // static fields are incorrect in the archive. With some more clever 2937 // initialization, this restriction can probably be lifted. 2938 // ??? UseLargePages might be okay now 2939 const bool cannot_share = UseCompressedOops || 2940 (UseLargePages && FLAG_IS_CMDLINE(UseLargePages)); 2941 if (cannot_share) { 2942 if (must_share) { 2943 warning("disabling large pages %s" 2944 "because of %s", "" LP64_ONLY("and compressed oops "), 2945 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 2946 FLAG_SET_CMDLINE(bool, UseLargePages, false); 2947 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 2948 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false)); 2949 } else { 2950 // Prefer compressed oops and large pages to class data sharing 2951 if (UseSharedSpaces && Verbose) { 2952 warning("turning off use of shared archive because of large pages%s", 2953 "" LP64_ONLY(" and/or compressed oops")); 2954 } 2955 no_shared_spaces(); 2956 } 2957 } else if (UseLargePages && might_share) { 2958 // Disable large pages to allow shared spaces. This is sub-optimal, since 2959 // there may not even be a shared archive to use. 2960 FLAG_SET_DEFAULT(UseLargePages, false); 2961 } 2962 2963 // Add 2M to any size for SharedReadOnlySize to get around the JPRT setting 2964 if (DumpSharedSpaces && !FLAG_IS_DEFAULT(SharedReadOnlySize)) { 2965 SharedReadOnlySize = 14*M; 2966 } 2967 2968 if (DumpSharedSpaces) { 2969 if (RequireSharedSpaces) { 2970 warning("cannot dump shared archive while using shared archive"); 2971 } 2972 UseSharedSpaces = false; 2973 } 2974 } 2975 2976 // Disable options not supported in this release, with a warning if they 2977 // were explicitly requested on the command-line 2978 #define UNSUPPORTED_OPTION(opt, description) \ 2979 do { \ 2980 if (opt) { \ 2981 if (FLAG_IS_CMDLINE(opt)) { \ 2982 warning(description " is disabled in this release."); \ 2983 } \ 2984 FLAG_SET_DEFAULT(opt, false); \ 2985 } \ 2986 } while(0) 2987 2988 // Parse entry point called from JNI_CreateJavaVM 2989 2990 jint Arguments::parse(const JavaVMInitArgs* args) { 2991 2992 // Sharing support 2993 // Construct the path to the archive 2994 char jvm_path[JVM_MAXPATHLEN]; 2995 os::jvm_path(jvm_path, sizeof(jvm_path)); 2996 char *end = strrchr(jvm_path, *os::file_separator()); 2997 if (end != NULL) *end = '\0'; 2998 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2999 strlen(os::file_separator()) + 20, mtInternal); 3000 if (shared_archive_path == NULL) return JNI_ENOMEM; 3001 strcpy(shared_archive_path, jvm_path); 3002 strcat(shared_archive_path, os::file_separator()); 3003 strcat(shared_archive_path, "classes"); 3004 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 3005 strcat(shared_archive_path, ".jsa"); 3006 SharedArchivePath = shared_archive_path; 3007 3008 // Remaining part of option string 3009 const char* tail; 3010 3011 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3012 const char* hotspotrc = ".hotspotrc"; 3013 bool settings_file_specified = false; 3014 bool needs_hotspotrc_warning = false; 3015 3016 const char* flags_file; 3017 int index; 3018 for (index = 0; index < args->nOptions; index++) { 3019 const JavaVMOption *option = args->options + index; 3020 if (match_option(option, "-XX:Flags=", &tail)) { 3021 flags_file = tail; 3022 settings_file_specified = true; 3023 } 3024 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3025 PrintVMOptions = true; 3026 } 3027 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3028 PrintVMOptions = false; 3029 } 3030 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3031 IgnoreUnrecognizedVMOptions = true; 3032 } 3033 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3034 IgnoreUnrecognizedVMOptions = false; 3035 } 3036 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3037 CommandLineFlags::printFlags(tty, false); 3038 vm_exit(0); 3039 } 3040 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3041 #if INCLUDE_NMT 3042 MemTracker::init_tracking_options(tail); 3043 #else 3044 warning("Native Memory Tracking is not supported in this VM"); 3045 #endif 3046 } 3047 3048 3049 #ifndef PRODUCT 3050 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3051 CommandLineFlags::printFlags(tty, true); 3052 vm_exit(0); 3053 } 3054 #endif 3055 } 3056 3057 if (IgnoreUnrecognizedVMOptions) { 3058 // uncast const to modify the flag args->ignoreUnrecognized 3059 *(jboolean*)(&args->ignoreUnrecognized) = true; 3060 } 3061 3062 // Parse specified settings file 3063 if (settings_file_specified) { 3064 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3065 return JNI_EINVAL; 3066 } 3067 } else { 3068 #ifdef ASSERT 3069 // Parse default .hotspotrc settings file 3070 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3071 return JNI_EINVAL; 3072 } 3073 #else 3074 struct stat buf; 3075 if (os::stat(hotspotrc, &buf) == 0) { 3076 needs_hotspotrc_warning = true; 3077 } 3078 #endif 3079 } 3080 3081 if (PrintVMOptions) { 3082 for (index = 0; index < args->nOptions; index++) { 3083 const JavaVMOption *option = args->options + index; 3084 if (match_option(option, "-XX:", &tail)) { 3085 logOption(tail); 3086 } 3087 } 3088 } 3089 3090 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3091 jint result = parse_vm_init_args(args); 3092 if (result != JNI_OK) { 3093 return result; 3094 } 3095 3096 // Delay warning until here so that we've had a chance to process 3097 // the -XX:-PrintWarnings flag 3098 if (needs_hotspotrc_warning) { 3099 warning("%s file is present but has been ignored. " 3100 "Run with -XX:Flags=%s to load the file.", 3101 hotspotrc, hotspotrc); 3102 } 3103 3104 #if (defined JAVASE_EMBEDDED || defined ARM) 3105 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3106 #endif 3107 3108 #if !INCLUDE_ALTERNATE_GCS 3109 if (UseParallelGC) { 3110 warning("Parallel GC is not supported in this VM. Using Serial GC."); 3111 } 3112 if (UseParallelOldGC) { 3113 warning("Parallel Old GC is not supported in this VM. Using Serial GC."); 3114 } 3115 if (UseConcMarkSweepGC) { 3116 warning("Concurrent Mark Sweep GC is not supported in this VM. Using Serial GC."); 3117 } 3118 if (UseParNewGC) { 3119 warning("Par Neew GC is not supported in this VM. Using Serial GC."); 3120 } 3121 #endif // INCLUDE_ALTERNATE_GCS 3122 3123 #ifndef PRODUCT 3124 if (TraceBytecodesAt != 0) { 3125 TraceBytecodes = true; 3126 } 3127 if (CountCompiledCalls) { 3128 if (UseCounterDecay) { 3129 warning("UseCounterDecay disabled because CountCalls is set"); 3130 UseCounterDecay = false; 3131 } 3132 } 3133 #endif // PRODUCT 3134 3135 // JSR 292 is not supported before 1.7 3136 if (!JDK_Version::is_gte_jdk17x_version()) { 3137 if (EnableInvokeDynamic) { 3138 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3139 warning("JSR 292 is not supported before 1.7. Disabling support."); 3140 } 3141 EnableInvokeDynamic = false; 3142 } 3143 } 3144 3145 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3146 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3147 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3148 } 3149 ScavengeRootsInCode = 1; 3150 } 3151 3152 if (PrintGCDetails) { 3153 // Turn on -verbose:gc options as well 3154 PrintGC = true; 3155 } 3156 3157 if (!JDK_Version::is_gte_jdk18x_version()) { 3158 // To avoid changing the log format for 7 updates this flag is only 3159 // true by default in JDK8 and above. 3160 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3161 FLAG_SET_DEFAULT(PrintGCCause, false); 3162 } 3163 } 3164 3165 // Set object alignment values. 3166 set_object_alignment(); 3167 3168 #ifdef SERIALGC 3169 force_serial_gc(); 3170 #endif // SERIALGC 3171 #if !INCLUDE_CDS 3172 no_shared_spaces(); 3173 #endif // INCLUDE_CDS 3174 3175 // Set flags based on ergonomics. 3176 set_ergonomics_flags(); 3177 3178 set_shared_spaces_flags(); 3179 3180 // Check the GC selections again. 3181 if (!check_gc_consistency()) { 3182 return JNI_EINVAL; 3183 } 3184 3185 if (TieredCompilation) { 3186 set_tiered_flags(); 3187 } else { 3188 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3189 if (CompilationPolicyChoice >= 2) { 3190 vm_exit_during_initialization( 3191 "Incompatible compilation policy selected", NULL); 3192 } 3193 } 3194 3195 // Set heap size based on available physical memory 3196 set_heap_size(); 3197 3198 #if INCLUDE_ALTERNATE_GCS 3199 // Set per-collector flags 3200 if (UseParallelGC || UseParallelOldGC) { 3201 set_parallel_gc_flags(); 3202 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3203 set_cms_and_parnew_gc_flags(); 3204 } else if (UseParNewGC) { // skipped if CMS is set above 3205 set_parnew_gc_flags(); 3206 } else if (UseG1GC) { 3207 set_g1_gc_flags(); 3208 } 3209 #endif // INCLUDE_ALTERNATE_GCS 3210 3211 #ifdef SERIALGC 3212 assert(verify_serial_gc_flags(), "SerialGC unset"); 3213 #endif // SERIALGC 3214 3215 // Set bytecode rewriting flags 3216 set_bytecode_flags(); 3217 3218 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3219 set_aggressive_opts_flags(); 3220 3221 // Turn off biased locking for locking debug mode flags, 3222 // which are subtlely different from each other but neither works with 3223 // biased locking. 3224 if (UseHeavyMonitors 3225 #ifdef COMPILER1 3226 || !UseFastLocking 3227 #endif // COMPILER1 3228 ) { 3229 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3230 // flag set to true on command line; warn the user that they 3231 // can't enable biased locking here 3232 warning("Biased Locking is not supported with locking debug flags" 3233 "; ignoring UseBiasedLocking flag." ); 3234 } 3235 UseBiasedLocking = false; 3236 } 3237 3238 #ifdef CC_INTERP 3239 // Clear flags not supported by the C++ interpreter 3240 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3241 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3242 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3243 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3244 #endif // CC_INTERP 3245 3246 #ifdef COMPILER2 3247 if (!UseBiasedLocking || EmitSync != 0) { 3248 UseOptoBiasInlining = false; 3249 } 3250 if (!EliminateLocks) { 3251 EliminateNestedLocks = false; 3252 } 3253 #endif 3254 3255 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3256 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3257 DebugNonSafepoints = true; 3258 } 3259 3260 #ifndef PRODUCT 3261 if (CompileTheWorld) { 3262 // Force NmethodSweeper to sweep whole CodeCache each time. 3263 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3264 NmethodSweepFraction = 1; 3265 } 3266 } 3267 #endif 3268 3269 if (PrintCommandLineFlags) { 3270 CommandLineFlags::printSetFlags(tty); 3271 } 3272 3273 // Apply CPU specific policy for the BiasedLocking 3274 if (UseBiasedLocking) { 3275 if (!VM_Version::use_biased_locking() && 3276 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3277 UseBiasedLocking = false; 3278 } 3279 } 3280 3281 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3282 // but only if not already set on the commandline 3283 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3284 bool set = false; 3285 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3286 if (!set) { 3287 FLAG_SET_DEFAULT(PauseAtExit, true); 3288 } 3289 } 3290 3291 return JNI_OK; 3292 } 3293 3294 int Arguments::PropertyList_count(SystemProperty* pl) { 3295 int count = 0; 3296 while(pl != NULL) { 3297 count++; 3298 pl = pl->next(); 3299 } 3300 return count; 3301 } 3302 3303 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3304 assert(key != NULL, "just checking"); 3305 SystemProperty* prop; 3306 for (prop = pl; prop != NULL; prop = prop->next()) { 3307 if (strcmp(key, prop->key()) == 0) return prop->value(); 3308 } 3309 return NULL; 3310 } 3311 3312 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3313 int count = 0; 3314 const char* ret_val = NULL; 3315 3316 while(pl != NULL) { 3317 if(count >= index) { 3318 ret_val = pl->key(); 3319 break; 3320 } 3321 count++; 3322 pl = pl->next(); 3323 } 3324 3325 return ret_val; 3326 } 3327 3328 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3329 int count = 0; 3330 char* ret_val = NULL; 3331 3332 while(pl != NULL) { 3333 if(count >= index) { 3334 ret_val = pl->value(); 3335 break; 3336 } 3337 count++; 3338 pl = pl->next(); 3339 } 3340 3341 return ret_val; 3342 } 3343 3344 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3345 SystemProperty* p = *plist; 3346 if (p == NULL) { 3347 *plist = new_p; 3348 } else { 3349 while (p->next() != NULL) { 3350 p = p->next(); 3351 } 3352 p->set_next(new_p); 3353 } 3354 } 3355 3356 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3357 if (plist == NULL) 3358 return; 3359 3360 SystemProperty* new_p = new SystemProperty(k, v, true); 3361 PropertyList_add(plist, new_p); 3362 } 3363 3364 // This add maintains unique property key in the list. 3365 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3366 if (plist == NULL) 3367 return; 3368 3369 // If property key exist then update with new value. 3370 SystemProperty* prop; 3371 for (prop = *plist; prop != NULL; prop = prop->next()) { 3372 if (strcmp(k, prop->key()) == 0) { 3373 if (append) { 3374 prop->append_value(v); 3375 } else { 3376 prop->set_value(v); 3377 } 3378 return; 3379 } 3380 } 3381 3382 PropertyList_add(plist, k, v); 3383 } 3384 3385 #ifdef KERNEL 3386 char *Arguments::get_kernel_properties() { 3387 // Find properties starting with kernel and append them to string 3388 // We need to find out how long they are first because the URL's that they 3389 // might point to could get long. 3390 int length = 0; 3391 SystemProperty* prop; 3392 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3393 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3394 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3395 } 3396 } 3397 // Add one for null terminator. 3398 char *props = AllocateHeap(length + 1, mtInternal); 3399 if (length != 0) { 3400 int pos = 0; 3401 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3402 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3403 jio_snprintf(&props[pos], length-pos, 3404 "-D%s=%s ", prop->key(), prop->value()); 3405 pos = strlen(props); 3406 } 3407 } 3408 } 3409 // null terminate props in case of null 3410 props[length] = '\0'; 3411 return props; 3412 } 3413 #endif // KERNEL 3414 3415 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3416 // Returns true if all of the source pointed by src has been copied over to 3417 // the destination buffer pointed by buf. Otherwise, returns false. 3418 // Notes: 3419 // 1. If the length (buflen) of the destination buffer excluding the 3420 // NULL terminator character is not long enough for holding the expanded 3421 // pid characters, it also returns false instead of returning the partially 3422 // expanded one. 3423 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3424 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3425 char* buf, size_t buflen) { 3426 const char* p = src; 3427 char* b = buf; 3428 const char* src_end = &src[srclen]; 3429 char* buf_end = &buf[buflen - 1]; 3430 3431 while (p < src_end && b < buf_end) { 3432 if (*p == '%') { 3433 switch (*(++p)) { 3434 case '%': // "%%" ==> "%" 3435 *b++ = *p++; 3436 break; 3437 case 'p': { // "%p" ==> current process id 3438 // buf_end points to the character before the last character so 3439 // that we could write '\0' to the end of the buffer. 3440 size_t buf_sz = buf_end - b + 1; 3441 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3442 3443 // if jio_snprintf fails or the buffer is not long enough to hold 3444 // the expanded pid, returns false. 3445 if (ret < 0 || ret >= (int)buf_sz) { 3446 return false; 3447 } else { 3448 b += ret; 3449 assert(*b == '\0', "fail in copy_expand_pid"); 3450 if (p == src_end && b == buf_end + 1) { 3451 // reach the end of the buffer. 3452 return true; 3453 } 3454 } 3455 p++; 3456 break; 3457 } 3458 default : 3459 *b++ = '%'; 3460 } 3461 } else { 3462 *b++ = *p++; 3463 } 3464 } 3465 *b = '\0'; 3466 return (p == src_end); // return false if not all of the source was copied 3467 }