1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "compiler/compilerOracle.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/cardTableRS.hpp" 31 #include "memory/referenceProcessor.hpp" 32 #include "memory/universe.inline.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "prims/jvmtiExport.hpp" 35 #include "runtime/arguments.hpp" 36 #include "runtime/globals_extension.hpp" 37 #include "runtime/java.hpp" 38 #include "services/management.hpp" 39 #include "services/memTracker.hpp" 40 #include "utilities/defaultStream.hpp" 41 #include "utilities/macros.hpp" 42 #include "utilities/taskqueue.hpp" 43 #ifdef TARGET_OS_FAMILY_linux 44 # include "os_linux.inline.hpp" 45 #endif 46 #ifdef TARGET_OS_FAMILY_solaris 47 # include "os_solaris.inline.hpp" 48 #endif 49 #ifdef TARGET_OS_FAMILY_windows 50 # include "os_windows.inline.hpp" 51 #endif 52 #ifdef TARGET_OS_FAMILY_bsd 53 # include "os_bsd.inline.hpp" 54 #endif 55 #if INCLUDE_ALL_GCS 56 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 57 #endif // INCLUDE_ALL_GCS 58 59 // Note: This is a special bug reporting site for the JVM 60 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 61 #define DEFAULT_JAVA_LAUNCHER "generic" 62 63 char** Arguments::_jvm_flags_array = NULL; 64 int Arguments::_num_jvm_flags = 0; 65 char** Arguments::_jvm_args_array = NULL; 66 int Arguments::_num_jvm_args = 0; 67 char* Arguments::_java_command = NULL; 68 SystemProperty* Arguments::_system_properties = NULL; 69 const char* Arguments::_gc_log_filename = NULL; 70 bool Arguments::_has_profile = false; 71 uintx Arguments::_min_heap_size = 0; 72 Arguments::Mode Arguments::_mode = _mixed; 73 bool Arguments::_java_compiler = false; 74 bool Arguments::_xdebug_mode = false; 75 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 76 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 77 int Arguments::_sun_java_launcher_pid = -1; 78 bool Arguments::_created_by_gamma_launcher = false; 79 80 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 81 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 82 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 83 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 84 bool Arguments::_ClipInlining = ClipInlining; 85 86 char* Arguments::SharedArchivePath = NULL; 87 88 AgentLibraryList Arguments::_libraryList; 89 AgentLibraryList Arguments::_agentList; 90 91 abort_hook_t Arguments::_abort_hook = NULL; 92 exit_hook_t Arguments::_exit_hook = NULL; 93 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 94 95 96 SystemProperty *Arguments::_java_ext_dirs = NULL; 97 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 98 SystemProperty *Arguments::_sun_boot_library_path = NULL; 99 SystemProperty *Arguments::_java_library_path = NULL; 100 SystemProperty *Arguments::_java_home = NULL; 101 SystemProperty *Arguments::_java_class_path = NULL; 102 SystemProperty *Arguments::_sun_boot_class_path = NULL; 103 104 char* Arguments::_meta_index_path = NULL; 105 char* Arguments::_meta_index_dir = NULL; 106 107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 108 109 static bool match_option(const JavaVMOption *option, const char* name, 110 const char** tail) { 111 int len = (int)strlen(name); 112 if (strncmp(option->optionString, name, len) == 0) { 113 *tail = option->optionString + len; 114 return true; 115 } else { 116 return false; 117 } 118 } 119 120 static void logOption(const char* opt) { 121 if (PrintVMOptions) { 122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 123 } 124 } 125 126 // Process java launcher properties. 127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 128 // See if sun.java.launcher or sun.java.launcher.pid is defined. 129 // Must do this before setting up other system properties, 130 // as some of them may depend on launcher type. 131 for (int index = 0; index < args->nOptions; index++) { 132 const JavaVMOption* option = args->options + index; 133 const char* tail; 134 135 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 136 process_java_launcher_argument(tail, option->extraInfo); 137 continue; 138 } 139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 140 _sun_java_launcher_pid = atoi(tail); 141 continue; 142 } 143 } 144 } 145 146 // Initialize system properties key and value. 147 void Arguments::init_system_properties() { 148 149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 150 "Java Virtual Machine Specification", false)); 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 154 155 // following are JVMTI agent writeable properties. 156 // Properties values are set to NULL and they are 157 // os specific they are initialized in os::init_system_properties_values(). 158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 161 _java_library_path = new SystemProperty("java.library.path", NULL, true); 162 _java_home = new SystemProperty("java.home", NULL, true); 163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 164 165 _java_class_path = new SystemProperty("java.class.path", "", true); 166 167 // Add to System Property list. 168 PropertyList_add(&_system_properties, _java_ext_dirs); 169 PropertyList_add(&_system_properties, _java_endorsed_dirs); 170 PropertyList_add(&_system_properties, _sun_boot_library_path); 171 PropertyList_add(&_system_properties, _java_library_path); 172 PropertyList_add(&_system_properties, _java_home); 173 PropertyList_add(&_system_properties, _java_class_path); 174 PropertyList_add(&_system_properties, _sun_boot_class_path); 175 176 // Set OS specific system properties values 177 os::init_system_properties_values(); 178 } 179 180 181 // Update/Initialize System properties after JDK version number is known 182 void Arguments::init_version_specific_system_properties() { 183 enum { bufsz = 16 }; 184 char buffer[bufsz]; 185 const char* spec_vendor = "Sun Microsystems Inc."; 186 uint32_t spec_version = 0; 187 188 if (JDK_Version::is_gte_jdk17x_version()) { 189 spec_vendor = "Oracle Corporation"; 190 spec_version = JDK_Version::current().major_version(); 191 } 192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 193 194 PropertyList_add(&_system_properties, 195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 196 PropertyList_add(&_system_properties, 197 new SystemProperty("java.vm.specification.version", buffer, false)); 198 PropertyList_add(&_system_properties, 199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 200 } 201 202 /** 203 * Provide a slightly more user-friendly way of eliminating -XX flags. 204 * When a flag is eliminated, it can be added to this list in order to 205 * continue accepting this flag on the command-line, while issuing a warning 206 * and ignoring the value. Once the JDK version reaches the 'accept_until' 207 * limit, we flatly refuse to admit the existence of the flag. This allows 208 * a flag to die correctly over JDK releases using HSX. 209 */ 210 typedef struct { 211 const char* name; 212 JDK_Version obsoleted_in; // when the flag went away 213 JDK_Version accept_until; // which version to start denying the existence 214 } ObsoleteFlag; 215 216 static ObsoleteFlag obsolete_jvm_flags[] = { 217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 232 { "DefaultInitialRAMFraction", 233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 234 { "UseDepthFirstScavengeOrder", 235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 236 { "HandlePromotionFailure", 237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 238 { "MaxLiveObjectEvacuationRatio", 239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 241 { "UseParallelOldGCCompacting", 242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 243 { "UseParallelDensePrefixUpdate", 244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 245 { "UseParallelOldGCDensePrefix", 246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 249 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 250 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 251 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 252 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 253 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 254 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 255 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 256 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 257 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 258 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 259 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 260 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 261 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 262 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 263 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 264 #ifdef PRODUCT 265 { "DesiredMethodLimit", 266 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 267 #endif // PRODUCT 268 { NULL, JDK_Version(0), JDK_Version(0) } 269 }; 270 271 // Returns true if the flag is obsolete and fits into the range specified 272 // for being ignored. In the case that the flag is ignored, the 'version' 273 // value is filled in with the version number when the flag became 274 // obsolete so that that value can be displayed to the user. 275 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 276 int i = 0; 277 assert(version != NULL, "Must provide a version buffer"); 278 while (obsolete_jvm_flags[i].name != NULL) { 279 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 280 // <flag>=xxx form 281 // [-|+]<flag> form 282 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 283 ((s[0] == '+' || s[0] == '-') && 284 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 285 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 286 *version = flag_status.obsoleted_in; 287 return true; 288 } 289 } 290 i++; 291 } 292 return false; 293 } 294 295 // Constructs the system class path (aka boot class path) from the following 296 // components, in order: 297 // 298 // prefix // from -Xbootclasspath/p:... 299 // endorsed // the expansion of -Djava.endorsed.dirs=... 300 // base // from os::get_system_properties() or -Xbootclasspath= 301 // suffix // from -Xbootclasspath/a:... 302 // 303 // java.endorsed.dirs is a list of directories; any jar or zip files in the 304 // directories are added to the sysclasspath just before the base. 305 // 306 // This could be AllStatic, but it isn't needed after argument processing is 307 // complete. 308 class SysClassPath: public StackObj { 309 public: 310 SysClassPath(const char* base); 311 ~SysClassPath(); 312 313 inline void set_base(const char* base); 314 inline void add_prefix(const char* prefix); 315 inline void add_suffix_to_prefix(const char* suffix); 316 inline void add_suffix(const char* suffix); 317 inline void reset_path(const char* base); 318 319 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 320 // property. Must be called after all command-line arguments have been 321 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 322 // combined_path(). 323 void expand_endorsed(); 324 325 inline const char* get_base() const { return _items[_scp_base]; } 326 inline const char* get_prefix() const { return _items[_scp_prefix]; } 327 inline const char* get_suffix() const { return _items[_scp_suffix]; } 328 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 329 330 // Combine all the components into a single c-heap-allocated string; caller 331 // must free the string if/when no longer needed. 332 char* combined_path(); 333 334 private: 335 // Utility routines. 336 static char* add_to_path(const char* path, const char* str, bool prepend); 337 static char* add_jars_to_path(char* path, const char* directory); 338 339 inline void reset_item_at(int index); 340 341 // Array indices for the items that make up the sysclasspath. All except the 342 // base are allocated in the C heap and freed by this class. 343 enum { 344 _scp_prefix, // from -Xbootclasspath/p:... 345 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 346 _scp_base, // the default sysclasspath 347 _scp_suffix, // from -Xbootclasspath/a:... 348 _scp_nitems // the number of items, must be last. 349 }; 350 351 const char* _items[_scp_nitems]; 352 DEBUG_ONLY(bool _expansion_done;) 353 }; 354 355 SysClassPath::SysClassPath(const char* base) { 356 memset(_items, 0, sizeof(_items)); 357 _items[_scp_base] = base; 358 DEBUG_ONLY(_expansion_done = false;) 359 } 360 361 SysClassPath::~SysClassPath() { 362 // Free everything except the base. 363 for (int i = 0; i < _scp_nitems; ++i) { 364 if (i != _scp_base) reset_item_at(i); 365 } 366 DEBUG_ONLY(_expansion_done = false;) 367 } 368 369 inline void SysClassPath::set_base(const char* base) { 370 _items[_scp_base] = base; 371 } 372 373 inline void SysClassPath::add_prefix(const char* prefix) { 374 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 375 } 376 377 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 378 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 379 } 380 381 inline void SysClassPath::add_suffix(const char* suffix) { 382 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 383 } 384 385 inline void SysClassPath::reset_item_at(int index) { 386 assert(index < _scp_nitems && index != _scp_base, "just checking"); 387 if (_items[index] != NULL) { 388 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 389 _items[index] = NULL; 390 } 391 } 392 393 inline void SysClassPath::reset_path(const char* base) { 394 // Clear the prefix and suffix. 395 reset_item_at(_scp_prefix); 396 reset_item_at(_scp_suffix); 397 set_base(base); 398 } 399 400 //------------------------------------------------------------------------------ 401 402 void SysClassPath::expand_endorsed() { 403 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 404 405 const char* path = Arguments::get_property("java.endorsed.dirs"); 406 if (path == NULL) { 407 path = Arguments::get_endorsed_dir(); 408 assert(path != NULL, "no default for java.endorsed.dirs"); 409 } 410 411 char* expanded_path = NULL; 412 const char separator = *os::path_separator(); 413 const char* const end = path + strlen(path); 414 while (path < end) { 415 const char* tmp_end = strchr(path, separator); 416 if (tmp_end == NULL) { 417 expanded_path = add_jars_to_path(expanded_path, path); 418 path = end; 419 } else { 420 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 421 memcpy(dirpath, path, tmp_end - path); 422 dirpath[tmp_end - path] = '\0'; 423 expanded_path = add_jars_to_path(expanded_path, dirpath); 424 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 425 path = tmp_end + 1; 426 } 427 } 428 _items[_scp_endorsed] = expanded_path; 429 DEBUG_ONLY(_expansion_done = true;) 430 } 431 432 // Combine the bootclasspath elements, some of which may be null, into a single 433 // c-heap-allocated string. 434 char* SysClassPath::combined_path() { 435 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 436 assert(_expansion_done, "must call expand_endorsed() first."); 437 438 size_t lengths[_scp_nitems]; 439 size_t total_len = 0; 440 441 const char separator = *os::path_separator(); 442 443 // Get the lengths. 444 int i; 445 for (i = 0; i < _scp_nitems; ++i) { 446 if (_items[i] != NULL) { 447 lengths[i] = strlen(_items[i]); 448 // Include space for the separator char (or a NULL for the last item). 449 total_len += lengths[i] + 1; 450 } 451 } 452 assert(total_len > 0, "empty sysclasspath not allowed"); 453 454 // Copy the _items to a single string. 455 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 456 char* cp_tmp = cp; 457 for (i = 0; i < _scp_nitems; ++i) { 458 if (_items[i] != NULL) { 459 memcpy(cp_tmp, _items[i], lengths[i]); 460 cp_tmp += lengths[i]; 461 *cp_tmp++ = separator; 462 } 463 } 464 *--cp_tmp = '\0'; // Replace the extra separator. 465 return cp; 466 } 467 468 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 469 char* 470 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 471 char *cp; 472 473 assert(str != NULL, "just checking"); 474 if (path == NULL) { 475 size_t len = strlen(str) + 1; 476 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 477 memcpy(cp, str, len); // copy the trailing null 478 } else { 479 const char separator = *os::path_separator(); 480 size_t old_len = strlen(path); 481 size_t str_len = strlen(str); 482 size_t len = old_len + str_len + 2; 483 484 if (prepend) { 485 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 486 char* cp_tmp = cp; 487 memcpy(cp_tmp, str, str_len); 488 cp_tmp += str_len; 489 *cp_tmp = separator; 490 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 491 FREE_C_HEAP_ARRAY(char, path, mtInternal); 492 } else { 493 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 494 char* cp_tmp = cp + old_len; 495 *cp_tmp = separator; 496 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 497 } 498 } 499 return cp; 500 } 501 502 // Scan the directory and append any jar or zip files found to path. 503 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 504 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 505 DIR* dir = os::opendir(directory); 506 if (dir == NULL) return path; 507 508 char dir_sep[2] = { '\0', '\0' }; 509 size_t directory_len = strlen(directory); 510 const char fileSep = *os::file_separator(); 511 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 512 513 /* Scan the directory for jars/zips, appending them to path. */ 514 struct dirent *entry; 515 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 516 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 517 const char* name = entry->d_name; 518 const char* ext = name + strlen(name) - 4; 519 bool isJarOrZip = ext > name && 520 (os::file_name_strcmp(ext, ".jar") == 0 || 521 os::file_name_strcmp(ext, ".zip") == 0); 522 if (isJarOrZip) { 523 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 524 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 525 path = add_to_path(path, jarpath, false); 526 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 527 } 528 } 529 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 530 os::closedir(dir); 531 return path; 532 } 533 534 // Parses a memory size specification string. 535 static bool atomull(const char *s, julong* result) { 536 julong n = 0; 537 int args_read = sscanf(s, JULONG_FORMAT, &n); 538 if (args_read != 1) { 539 return false; 540 } 541 while (*s != '\0' && isdigit(*s)) { 542 s++; 543 } 544 // 4705540: illegal if more characters are found after the first non-digit 545 if (strlen(s) > 1) { 546 return false; 547 } 548 switch (*s) { 549 case 'T': case 't': 550 *result = n * G * K; 551 // Check for overflow. 552 if (*result/((julong)G * K) != n) return false; 553 return true; 554 case 'G': case 'g': 555 *result = n * G; 556 if (*result/G != n) return false; 557 return true; 558 case 'M': case 'm': 559 *result = n * M; 560 if (*result/M != n) return false; 561 return true; 562 case 'K': case 'k': 563 *result = n * K; 564 if (*result/K != n) return false; 565 return true; 566 case '\0': 567 *result = n; 568 return true; 569 default: 570 return false; 571 } 572 } 573 574 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 575 if (size < min_size) return arg_too_small; 576 // Check that size will fit in a size_t (only relevant on 32-bit) 577 if (size > max_uintx) return arg_too_big; 578 return arg_in_range; 579 } 580 581 // Describe an argument out of range error 582 void Arguments::describe_range_error(ArgsRange errcode) { 583 switch(errcode) { 584 case arg_too_big: 585 jio_fprintf(defaultStream::error_stream(), 586 "The specified size exceeds the maximum " 587 "representable size.\n"); 588 break; 589 case arg_too_small: 590 case arg_unreadable: 591 case arg_in_range: 592 // do nothing for now 593 break; 594 default: 595 ShouldNotReachHere(); 596 } 597 } 598 599 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 600 return CommandLineFlags::boolAtPut(name, &value, origin); 601 } 602 603 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 604 double v; 605 if (sscanf(value, "%lf", &v) != 1) { 606 return false; 607 } 608 609 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 610 return true; 611 } 612 return false; 613 } 614 615 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 616 julong v; 617 intx intx_v; 618 bool is_neg = false; 619 // Check the sign first since atomull() parses only unsigned values. 620 if (*value == '-') { 621 if (!CommandLineFlags::intxAt(name, &intx_v)) { 622 return false; 623 } 624 value++; 625 is_neg = true; 626 } 627 if (!atomull(value, &v)) { 628 return false; 629 } 630 intx_v = (intx) v; 631 if (is_neg) { 632 intx_v = -intx_v; 633 } 634 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 635 return true; 636 } 637 uintx uintx_v = (uintx) v; 638 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 639 return true; 640 } 641 uint64_t uint64_t_v = (uint64_t) v; 642 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 643 return true; 644 } 645 return false; 646 } 647 648 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 649 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 650 // Contract: CommandLineFlags always returns a pointer that needs freeing. 651 FREE_C_HEAP_ARRAY(char, value, mtInternal); 652 return true; 653 } 654 655 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 656 const char* old_value = ""; 657 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 658 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 659 size_t new_len = strlen(new_value); 660 const char* value; 661 char* free_this_too = NULL; 662 if (old_len == 0) { 663 value = new_value; 664 } else if (new_len == 0) { 665 value = old_value; 666 } else { 667 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 668 // each new setting adds another LINE to the switch: 669 sprintf(buf, "%s\n%s", old_value, new_value); 670 value = buf; 671 free_this_too = buf; 672 } 673 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 674 // CommandLineFlags always returns a pointer that needs freeing. 675 FREE_C_HEAP_ARRAY(char, value, mtInternal); 676 if (free_this_too != NULL) { 677 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 678 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 679 } 680 return true; 681 } 682 683 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 684 685 // range of acceptable characters spelled out for portability reasons 686 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 687 #define BUFLEN 255 688 char name[BUFLEN+1]; 689 char dummy; 690 691 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 692 return set_bool_flag(name, false, origin); 693 } 694 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 695 return set_bool_flag(name, true, origin); 696 } 697 698 char punct; 699 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 700 const char* value = strchr(arg, '=') + 1; 701 Flag* flag = Flag::find_flag(name, strlen(name)); 702 if (flag != NULL && flag->is_ccstr()) { 703 if (flag->ccstr_accumulates()) { 704 return append_to_string_flag(name, value, origin); 705 } else { 706 if (value[0] == '\0') { 707 value = NULL; 708 } 709 return set_string_flag(name, value, origin); 710 } 711 } 712 } 713 714 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 715 const char* value = strchr(arg, '=') + 1; 716 // -XX:Foo:=xxx will reset the string flag to the given value. 717 if (value[0] == '\0') { 718 value = NULL; 719 } 720 return set_string_flag(name, value, origin); 721 } 722 723 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 724 #define SIGNED_NUMBER_RANGE "[-0123456789]" 725 #define NUMBER_RANGE "[0123456789]" 726 char value[BUFLEN + 1]; 727 char value2[BUFLEN + 1]; 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 729 // Looks like a floating-point number -- try again with more lenient format string 730 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 731 return set_fp_numeric_flag(name, value, origin); 732 } 733 } 734 735 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 736 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 737 return set_numeric_flag(name, value, origin); 738 } 739 740 return false; 741 } 742 743 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 744 assert(bldarray != NULL, "illegal argument"); 745 746 if (arg == NULL) { 747 return; 748 } 749 750 int new_count = *count + 1; 751 752 // expand the array and add arg to the last element 753 if (*bldarray == NULL) { 754 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 755 } else { 756 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 757 } 758 (*bldarray)[*count] = strdup(arg); 759 *count = new_count; 760 } 761 762 void Arguments::build_jvm_args(const char* arg) { 763 add_string(&_jvm_args_array, &_num_jvm_args, arg); 764 } 765 766 void Arguments::build_jvm_flags(const char* arg) { 767 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 768 } 769 770 // utility function to return a string that concatenates all 771 // strings in a given char** array 772 const char* Arguments::build_resource_string(char** args, int count) { 773 if (args == NULL || count == 0) { 774 return NULL; 775 } 776 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 777 for (int i = 1; i < count; i++) { 778 length += strlen(args[i]) + 1; // add 1 for a space 779 } 780 char* s = NEW_RESOURCE_ARRAY(char, length); 781 strcpy(s, args[0]); 782 for (int j = 1; j < count; j++) { 783 strcat(s, " "); 784 strcat(s, args[j]); 785 } 786 return (const char*) s; 787 } 788 789 void Arguments::print_on(outputStream* st) { 790 st->print_cr("VM Arguments:"); 791 if (num_jvm_flags() > 0) { 792 st->print("jvm_flags: "); print_jvm_flags_on(st); 793 } 794 if (num_jvm_args() > 0) { 795 st->print("jvm_args: "); print_jvm_args_on(st); 796 } 797 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 798 if (_java_class_path != NULL) { 799 char* path = _java_class_path->value(); 800 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 801 } 802 st->print_cr("Launcher Type: %s", _sun_java_launcher); 803 } 804 805 void Arguments::print_jvm_flags_on(outputStream* st) { 806 if (_num_jvm_flags > 0) { 807 for (int i=0; i < _num_jvm_flags; i++) { 808 st->print("%s ", _jvm_flags_array[i]); 809 } 810 st->print_cr(""); 811 } 812 } 813 814 void Arguments::print_jvm_args_on(outputStream* st) { 815 if (_num_jvm_args > 0) { 816 for (int i=0; i < _num_jvm_args; i++) { 817 st->print("%s ", _jvm_args_array[i]); 818 } 819 st->print_cr(""); 820 } 821 } 822 823 bool Arguments::process_argument(const char* arg, 824 jboolean ignore_unrecognized, FlagValueOrigin origin) { 825 826 JDK_Version since = JDK_Version(); 827 828 if (parse_argument(arg, origin) || ignore_unrecognized) { 829 return true; 830 } 831 832 bool has_plus_minus = (*arg == '+' || *arg == '-'); 833 const char* const argname = has_plus_minus ? arg + 1 : arg; 834 if (is_newly_obsolete(arg, &since)) { 835 char version[256]; 836 since.to_string(version, sizeof(version)); 837 warning("ignoring option %s; support was removed in %s", argname, version); 838 return true; 839 } 840 841 // For locked flags, report a custom error message if available. 842 // Otherwise, report the standard unrecognized VM option. 843 844 size_t arg_len; 845 const char* equal_sign = strchr(argname, '='); 846 if (equal_sign == NULL) { 847 arg_len = strlen(argname); 848 } else { 849 arg_len = equal_sign - argname; 850 } 851 852 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true); 853 if (found_flag != NULL) { 854 char locked_message_buf[BUFLEN]; 855 found_flag->get_locked_message(locked_message_buf, BUFLEN); 856 if (strlen(locked_message_buf) == 0) { 857 if (found_flag->is_bool() && !has_plus_minus) { 858 jio_fprintf(defaultStream::error_stream(), 859 "Missing +/- setting for VM option '%s'\n", argname); 860 } else if (!found_flag->is_bool() && has_plus_minus) { 861 jio_fprintf(defaultStream::error_stream(), 862 "Unexpected +/- setting in VM option '%s'\n", argname); 863 } else { 864 jio_fprintf(defaultStream::error_stream(), 865 "Improperly specified VM option '%s'\n", argname); 866 } 867 } else { 868 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 869 } 870 } else { 871 jio_fprintf(defaultStream::error_stream(), 872 "Unrecognized VM option '%s'\n", argname); 873 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 874 if (fuzzy_matched != NULL) { 875 jio_fprintf(defaultStream::error_stream(), 876 "Did you mean '%s%s%s'?\n", 877 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 878 fuzzy_matched->name, 879 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 880 } 881 } 882 883 // allow for commandline "commenting out" options like -XX:#+Verbose 884 return arg[0] == '#'; 885 } 886 887 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 888 FILE* stream = fopen(file_name, "rb"); 889 if (stream == NULL) { 890 if (should_exist) { 891 jio_fprintf(defaultStream::error_stream(), 892 "Could not open settings file %s\n", file_name); 893 return false; 894 } else { 895 return true; 896 } 897 } 898 899 char token[1024]; 900 int pos = 0; 901 902 bool in_white_space = true; 903 bool in_comment = false; 904 bool in_quote = false; 905 char quote_c = 0; 906 bool result = true; 907 908 int c = getc(stream); 909 while(c != EOF && pos < (int)(sizeof(token)-1)) { 910 if (in_white_space) { 911 if (in_comment) { 912 if (c == '\n') in_comment = false; 913 } else { 914 if (c == '#') in_comment = true; 915 else if (!isspace(c)) { 916 in_white_space = false; 917 token[pos++] = c; 918 } 919 } 920 } else { 921 if (c == '\n' || (!in_quote && isspace(c))) { 922 // token ends at newline, or at unquoted whitespace 923 // this allows a way to include spaces in string-valued options 924 token[pos] = '\0'; 925 logOption(token); 926 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 927 build_jvm_flags(token); 928 pos = 0; 929 in_white_space = true; 930 in_quote = false; 931 } else if (!in_quote && (c == '\'' || c == '"')) { 932 in_quote = true; 933 quote_c = c; 934 } else if (in_quote && (c == quote_c)) { 935 in_quote = false; 936 } else { 937 token[pos++] = c; 938 } 939 } 940 c = getc(stream); 941 } 942 if (pos > 0) { 943 token[pos] = '\0'; 944 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 945 build_jvm_flags(token); 946 } 947 fclose(stream); 948 return result; 949 } 950 951 //============================================================================================================= 952 // Parsing of properties (-D) 953 954 const char* Arguments::get_property(const char* key) { 955 return PropertyList_get_value(system_properties(), key); 956 } 957 958 bool Arguments::add_property(const char* prop) { 959 const char* eq = strchr(prop, '='); 960 char* key; 961 // ns must be static--its address may be stored in a SystemProperty object. 962 const static char ns[1] = {0}; 963 char* value = (char *)ns; 964 965 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 966 key = AllocateHeap(key_len + 1, mtInternal); 967 strncpy(key, prop, key_len); 968 key[key_len] = '\0'; 969 970 if (eq != NULL) { 971 size_t value_len = strlen(prop) - key_len - 1; 972 value = AllocateHeap(value_len + 1, mtInternal); 973 strncpy(value, &prop[key_len + 1], value_len + 1); 974 } 975 976 if (strcmp(key, "java.compiler") == 0) { 977 process_java_compiler_argument(value); 978 FreeHeap(key); 979 if (eq != NULL) { 980 FreeHeap(value); 981 } 982 return true; 983 } else if (strcmp(key, "sun.java.command") == 0) { 984 _java_command = value; 985 986 // Record value in Arguments, but let it get passed to Java. 987 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 988 // launcher.pid property is private and is processed 989 // in process_sun_java_launcher_properties(); 990 // the sun.java.launcher property is passed on to the java application 991 FreeHeap(key); 992 if (eq != NULL) { 993 FreeHeap(value); 994 } 995 return true; 996 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 997 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 998 // its value without going through the property list or making a Java call. 999 _java_vendor_url_bug = value; 1000 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1001 PropertyList_unique_add(&_system_properties, key, value, true); 1002 return true; 1003 } 1004 // Create new property and add at the end of the list 1005 PropertyList_unique_add(&_system_properties, key, value); 1006 return true; 1007 } 1008 1009 //=========================================================================================================== 1010 // Setting int/mixed/comp mode flags 1011 1012 void Arguments::set_mode_flags(Mode mode) { 1013 // Set up default values for all flags. 1014 // If you add a flag to any of the branches below, 1015 // add a default value for it here. 1016 set_java_compiler(false); 1017 _mode = mode; 1018 1019 // Ensure Agent_OnLoad has the correct initial values. 1020 // This may not be the final mode; mode may change later in onload phase. 1021 PropertyList_unique_add(&_system_properties, "java.vm.info", 1022 (char*)VM_Version::vm_info_string(), false); 1023 1024 UseInterpreter = true; 1025 UseCompiler = true; 1026 UseLoopCounter = true; 1027 1028 #ifndef ZERO 1029 // Turn these off for mixed and comp. Leave them on for Zero. 1030 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1031 UseFastAccessorMethods = (mode == _int); 1032 } 1033 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1034 UseFastEmptyMethods = (mode == _int); 1035 } 1036 #endif 1037 1038 // Default values may be platform/compiler dependent - 1039 // use the saved values 1040 ClipInlining = Arguments::_ClipInlining; 1041 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1042 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1043 BackgroundCompilation = Arguments::_BackgroundCompilation; 1044 1045 // Change from defaults based on mode 1046 switch (mode) { 1047 default: 1048 ShouldNotReachHere(); 1049 break; 1050 case _int: 1051 UseCompiler = false; 1052 UseLoopCounter = false; 1053 AlwaysCompileLoopMethods = false; 1054 UseOnStackReplacement = false; 1055 break; 1056 case _mixed: 1057 // same as default 1058 break; 1059 case _comp: 1060 UseInterpreter = false; 1061 BackgroundCompilation = false; 1062 ClipInlining = false; 1063 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1064 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1065 // compile a level 4 (C2) and then continue executing it. 1066 if (TieredCompilation) { 1067 Tier3InvokeNotifyFreqLog = 0; 1068 Tier4InvocationThreshold = 0; 1069 } 1070 break; 1071 } 1072 } 1073 1074 // Conflict: required to use shared spaces (-Xshare:on), but 1075 // incompatible command line options were chosen. 1076 1077 static void no_shared_spaces() { 1078 if (RequireSharedSpaces) { 1079 jio_fprintf(defaultStream::error_stream(), 1080 "Class data sharing is inconsistent with other specified options.\n"); 1081 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1082 } else { 1083 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1084 } 1085 } 1086 1087 void Arguments::set_tiered_flags() { 1088 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1089 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1090 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1091 } 1092 if (CompilationPolicyChoice < 2) { 1093 vm_exit_during_initialization( 1094 "Incompatible compilation policy selected", NULL); 1095 } 1096 // Increase the code cache size - tiered compiles a lot more. 1097 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1098 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1099 } 1100 if (!UseInterpreter) { // -Xcomp 1101 Tier3InvokeNotifyFreqLog = 0; 1102 Tier4InvocationThreshold = 0; 1103 } 1104 } 1105 1106 #if INCLUDE_ALL_GCS 1107 static void disable_adaptive_size_policy(const char* collector_name) { 1108 if (UseAdaptiveSizePolicy) { 1109 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1110 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1111 collector_name); 1112 } 1113 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1114 } 1115 } 1116 1117 void Arguments::set_parnew_gc_flags() { 1118 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1119 "control point invariant"); 1120 assert(UseParNewGC, "Error"); 1121 1122 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1123 disable_adaptive_size_policy("UseParNewGC"); 1124 1125 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1126 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1127 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1128 } else if (ParallelGCThreads == 0) { 1129 jio_fprintf(defaultStream::error_stream(), 1130 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1131 vm_exit(1); 1132 } 1133 1134 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1135 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1136 // we set them to 1024 and 1024. 1137 // See CR 6362902. 1138 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1139 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1140 } 1141 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1142 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1143 } 1144 1145 // AlwaysTenure flag should make ParNew promote all at first collection. 1146 // See CR 6362902. 1147 if (AlwaysTenure) { 1148 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1149 } 1150 // When using compressed oops, we use local overflow stacks, 1151 // rather than using a global overflow list chained through 1152 // the klass word of the object's pre-image. 1153 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1154 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1155 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1156 } 1157 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1158 } 1159 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1160 } 1161 1162 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1163 // sparc/solaris for certain applications, but would gain from 1164 // further optimization and tuning efforts, and would almost 1165 // certainly gain from analysis of platform and environment. 1166 void Arguments::set_cms_and_parnew_gc_flags() { 1167 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1168 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1169 1170 // If we are using CMS, we prefer to UseParNewGC, 1171 // unless explicitly forbidden. 1172 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1173 FLAG_SET_ERGO(bool, UseParNewGC, true); 1174 } 1175 1176 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1177 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1178 1179 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1180 // as needed. 1181 if (UseParNewGC) { 1182 set_parnew_gc_flags(); 1183 } 1184 1185 size_t max_heap = align_size_down(MaxHeapSize, 1186 CardTableRS::ct_max_alignment_constraint()); 1187 1188 // Now make adjustments for CMS 1189 intx tenuring_default = (intx)6; 1190 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1191 1192 // Preferred young gen size for "short" pauses: 1193 // upper bound depends on # of threads and NewRatio. 1194 const uintx parallel_gc_threads = 1195 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1196 const size_t preferred_max_new_size_unaligned = 1197 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1198 size_t preferred_max_new_size = 1199 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1200 1201 // Unless explicitly requested otherwise, size young gen 1202 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1203 1204 // If either MaxNewSize or NewRatio is set on the command line, 1205 // assume the user is trying to set the size of the young gen. 1206 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1207 1208 // Set MaxNewSize to our calculated preferred_max_new_size unless 1209 // NewSize was set on the command line and it is larger than 1210 // preferred_max_new_size. 1211 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1212 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1213 } else { 1214 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1215 } 1216 if (PrintGCDetails && Verbose) { 1217 // Too early to use gclog_or_tty 1218 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1219 } 1220 1221 // Code along this path potentially sets NewSize and OldSize 1222 if (PrintGCDetails && Verbose) { 1223 // Too early to use gclog_or_tty 1224 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1225 " initial_heap_size: " SIZE_FORMAT 1226 " max_heap: " SIZE_FORMAT, 1227 min_heap_size(), InitialHeapSize, max_heap); 1228 } 1229 size_t min_new = preferred_max_new_size; 1230 if (FLAG_IS_CMDLINE(NewSize)) { 1231 min_new = NewSize; 1232 } 1233 if (max_heap > min_new && min_heap_size() > min_new) { 1234 // Unless explicitly requested otherwise, make young gen 1235 // at least min_new, and at most preferred_max_new_size. 1236 if (FLAG_IS_DEFAULT(NewSize)) { 1237 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1238 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1239 if (PrintGCDetails && Verbose) { 1240 // Too early to use gclog_or_tty 1241 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1242 } 1243 } 1244 // Unless explicitly requested otherwise, size old gen 1245 // so it's NewRatio x of NewSize. 1246 if (FLAG_IS_DEFAULT(OldSize)) { 1247 if (max_heap > NewSize) { 1248 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1249 if (PrintGCDetails && Verbose) { 1250 // Too early to use gclog_or_tty 1251 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1252 } 1253 } 1254 } 1255 } 1256 } 1257 // Unless explicitly requested otherwise, definitely 1258 // promote all objects surviving "tenuring_default" scavenges. 1259 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1260 FLAG_IS_DEFAULT(SurvivorRatio)) { 1261 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1262 } 1263 // If we decided above (or user explicitly requested) 1264 // `promote all' (via MaxTenuringThreshold := 0), 1265 // prefer minuscule survivor spaces so as not to waste 1266 // space for (non-existent) survivors 1267 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1268 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1269 } 1270 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1271 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1272 // This is done in order to make ParNew+CMS configuration to work 1273 // with YoungPLABSize and OldPLABSize options. 1274 // See CR 6362902. 1275 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1276 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1277 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1278 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1279 // the value (either from the command line or ergonomics) of 1280 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1281 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1282 } else { 1283 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1284 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1285 // we'll let it to take precedence. 1286 jio_fprintf(defaultStream::error_stream(), 1287 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1288 " options are specified for the CMS collector." 1289 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1290 } 1291 } 1292 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1293 // OldPLAB sizing manually turned off: Use a larger default setting, 1294 // unless it was manually specified. This is because a too-low value 1295 // will slow down scavenges. 1296 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1297 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1298 } 1299 } 1300 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1301 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1302 // If either of the static initialization defaults have changed, note this 1303 // modification. 1304 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1305 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1306 } 1307 if (PrintGCDetails && Verbose) { 1308 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1309 MarkStackSize / K, MarkStackSizeMax / K); 1310 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1311 } 1312 } 1313 #endif // INCLUDE_ALL_GCS 1314 1315 void set_object_alignment() { 1316 // Object alignment. 1317 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1318 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1319 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1320 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1321 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1322 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1323 1324 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1325 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1326 1327 // Oop encoding heap max 1328 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1329 1330 #if INCLUDE_ALL_GCS 1331 // Set CMS global values 1332 CompactibleFreeListSpace::set_cms_values(); 1333 #endif // INCLUDE_ALL_GCS 1334 } 1335 1336 bool verify_object_alignment() { 1337 // Object alignment. 1338 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1339 jio_fprintf(defaultStream::error_stream(), 1340 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1341 (int)ObjectAlignmentInBytes); 1342 return false; 1343 } 1344 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1345 jio_fprintf(defaultStream::error_stream(), 1346 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1347 (int)ObjectAlignmentInBytes, BytesPerLong); 1348 return false; 1349 } 1350 // It does not make sense to have big object alignment 1351 // since a space lost due to alignment will be greater 1352 // then a saved space from compressed oops. 1353 if ((int)ObjectAlignmentInBytes > 256) { 1354 jio_fprintf(defaultStream::error_stream(), 1355 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1356 (int)ObjectAlignmentInBytes); 1357 return false; 1358 } 1359 // In case page size is very small. 1360 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1361 jio_fprintf(defaultStream::error_stream(), 1362 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1363 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1364 return false; 1365 } 1366 return true; 1367 } 1368 1369 inline uintx max_heap_for_compressed_oops() { 1370 // Avoid sign flip. 1371 if (OopEncodingHeapMax < ClassMetaspaceSize + os::vm_page_size()) { 1372 return 0; 1373 } 1374 LP64_ONLY(return OopEncodingHeapMax - ClassMetaspaceSize - os::vm_page_size()); 1375 NOT_LP64(ShouldNotReachHere(); return 0); 1376 } 1377 1378 bool Arguments::should_auto_select_low_pause_collector() { 1379 if (UseAutoGCSelectPolicy && 1380 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1381 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1382 if (PrintGCDetails) { 1383 // Cannot use gclog_or_tty yet. 1384 tty->print_cr("Automatic selection of the low pause collector" 1385 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1386 } 1387 return true; 1388 } 1389 return false; 1390 } 1391 1392 void Arguments::set_use_compressed_oops() { 1393 #ifndef ZERO 1394 #ifdef _LP64 1395 // MaxHeapSize is not set up properly at this point, but 1396 // the only value that can override MaxHeapSize if we are 1397 // to use UseCompressedOops is InitialHeapSize. 1398 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1399 1400 if (max_heap_size <= max_heap_for_compressed_oops()) { 1401 #if !defined(COMPILER1) || defined(TIERED) 1402 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1403 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1404 } 1405 #endif 1406 #ifdef _WIN64 1407 if (UseLargePages && UseCompressedOops) { 1408 // Cannot allocate guard pages for implicit checks in indexed addressing 1409 // mode, when large pages are specified on windows. 1410 // This flag could be switched ON if narrow oop base address is set to 0, 1411 // see code in Universe::initialize_heap(). 1412 Universe::set_narrow_oop_use_implicit_null_checks(false); 1413 } 1414 #endif // _WIN64 1415 } else { 1416 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1417 warning("Max heap size too large for Compressed Oops"); 1418 FLAG_SET_DEFAULT(UseCompressedOops, false); 1419 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1420 } 1421 } 1422 #endif // _LP64 1423 #endif // ZERO 1424 } 1425 1426 void Arguments::set_ergonomics_flags() { 1427 1428 if (os::is_server_class_machine()) { 1429 // If no other collector is requested explicitly, 1430 // let the VM select the collector based on 1431 // machine class and automatic selection policy. 1432 if (!UseSerialGC && 1433 !UseConcMarkSweepGC && 1434 !UseG1GC && 1435 !UseParNewGC && 1436 FLAG_IS_DEFAULT(UseParallelGC)) { 1437 if (should_auto_select_low_pause_collector()) { 1438 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1439 } else { 1440 FLAG_SET_ERGO(bool, UseParallelGC, true); 1441 } 1442 } 1443 // Shared spaces work fine with other GCs but causes bytecode rewriting 1444 // to be disabled, which hurts interpreter performance and decreases 1445 // server performance. On server class machines, keep the default 1446 // off unless it is asked for. Future work: either add bytecode rewriting 1447 // at link time, or rewrite bytecodes in non-shared methods. 1448 if (!DumpSharedSpaces && !RequireSharedSpaces) { 1449 no_shared_spaces(); 1450 } 1451 } 1452 1453 #ifndef ZERO 1454 #ifdef _LP64 1455 set_use_compressed_oops(); 1456 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1457 if (!UseCompressedOops) { 1458 if (UseCompressedKlassPointers) { 1459 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1460 } 1461 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1462 } else { 1463 // Turn on UseCompressedKlassPointers too 1464 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1465 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1466 } 1467 // Set the ClassMetaspaceSize to something that will not need to be 1468 // expanded, since it cannot be expanded. 1469 if (UseCompressedKlassPointers) { 1470 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) { 1471 warning("Class metaspace size is too large for UseCompressedKlassPointers"); 1472 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1473 } else if (FLAG_IS_DEFAULT(ClassMetaspaceSize)) { 1474 // 100,000 classes seems like a good size, so 100M assumes around 1K 1475 // per klass. The vtable and oopMap is embedded so we don't have a fixed 1476 // size per klass. Eventually, this will be parameterized because it 1477 // would also be useful to determine the optimal size of the 1478 // systemDictionary. 1479 FLAG_SET_ERGO(uintx, ClassMetaspaceSize, 100*M); 1480 } 1481 } 1482 } 1483 // Also checks that certain machines are slower with compressed oops 1484 // in vm_version initialization code. 1485 #endif // _LP64 1486 #endif // !ZERO 1487 } 1488 1489 void Arguments::set_parallel_gc_flags() { 1490 assert(UseParallelGC || UseParallelOldGC, "Error"); 1491 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1492 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1493 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1494 } 1495 FLAG_SET_DEFAULT(UseParallelGC, true); 1496 1497 // If no heap maximum was requested explicitly, use some reasonable fraction 1498 // of the physical memory, up to a maximum of 1GB. 1499 FLAG_SET_DEFAULT(ParallelGCThreads, 1500 Abstract_VM_Version::parallel_worker_threads()); 1501 if (ParallelGCThreads == 0) { 1502 jio_fprintf(defaultStream::error_stream(), 1503 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1504 vm_exit(1); 1505 } 1506 1507 1508 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1509 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1510 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1511 // See CR 6362902 for details. 1512 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1513 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1514 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1515 } 1516 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1517 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1518 } 1519 } 1520 1521 if (UseParallelOldGC) { 1522 // Par compact uses lower default values since they are treated as 1523 // minimums. These are different defaults because of the different 1524 // interpretation and are not ergonomically set. 1525 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1526 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1527 } 1528 } 1529 } 1530 1531 void Arguments::set_g1_gc_flags() { 1532 assert(UseG1GC, "Error"); 1533 #ifdef COMPILER1 1534 FastTLABRefill = false; 1535 #endif 1536 FLAG_SET_DEFAULT(ParallelGCThreads, 1537 Abstract_VM_Version::parallel_worker_threads()); 1538 if (ParallelGCThreads == 0) { 1539 FLAG_SET_DEFAULT(ParallelGCThreads, 1540 Abstract_VM_Version::parallel_worker_threads()); 1541 } 1542 1543 // MarkStackSize will be set (if it hasn't been set by the user) 1544 // when concurrent marking is initialized. 1545 // Its value will be based upon the number of parallel marking threads. 1546 // But we do set the maximum mark stack size here. 1547 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1548 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1549 } 1550 1551 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1552 // In G1, we want the default GC overhead goal to be higher than 1553 // say in PS. So we set it here to 10%. Otherwise the heap might 1554 // be expanded more aggressively than we would like it to. In 1555 // fact, even 10% seems to not be high enough in some cases 1556 // (especially small GC stress tests that the main thing they do 1557 // is allocation). We might consider increase it further. 1558 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1559 } 1560 1561 if (PrintGCDetails && Verbose) { 1562 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1563 MarkStackSize / K, MarkStackSizeMax / K); 1564 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1565 } 1566 } 1567 1568 julong Arguments::limit_by_allocatable_memory(julong limit) { 1569 julong max_allocatable; 1570 julong result = limit; 1571 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1572 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1573 } 1574 return result; 1575 } 1576 1577 void Arguments::set_heap_base_min_address() { 1578 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) { 1579 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86. 1580 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1 1581 // some extra space for the C-heap compared to other collectors. 1582 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that 1583 // code that checks for default values work correctly. 1584 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G); 1585 } 1586 } 1587 1588 void Arguments::set_heap_size() { 1589 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1590 // Deprecated flag 1591 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1592 } 1593 1594 const julong phys_mem = 1595 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1596 : (julong)MaxRAM; 1597 1598 // If the maximum heap size has not been set with -Xmx, 1599 // then set it as fraction of the size of physical memory, 1600 // respecting the maximum and minimum sizes of the heap. 1601 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1602 julong reasonable_max = phys_mem / MaxRAMFraction; 1603 1604 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1605 // Small physical memory, so use a minimum fraction of it for the heap 1606 reasonable_max = phys_mem / MinRAMFraction; 1607 } else { 1608 // Not-small physical memory, so require a heap at least 1609 // as large as MaxHeapSize 1610 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1611 } 1612 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1613 // Limit the heap size to ErgoHeapSizeLimit 1614 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1615 } 1616 if (UseCompressedOops) { 1617 // Limit the heap size to the maximum possible when using compressed oops 1618 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1619 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1620 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1621 // but it should be not less than default MaxHeapSize. 1622 max_coop_heap -= HeapBaseMinAddress; 1623 } 1624 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1625 } 1626 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1627 1628 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1629 // An initial heap size was specified on the command line, 1630 // so be sure that the maximum size is consistent. Done 1631 // after call to limit_by_allocatable_memory because that 1632 // method might reduce the allocation size. 1633 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1634 } 1635 1636 if (PrintGCDetails && Verbose) { 1637 // Cannot use gclog_or_tty yet. 1638 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1639 } 1640 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1641 } 1642 1643 // If the minimum or initial heap_size have not been set or requested to be set 1644 // ergonomically, set them accordingly. 1645 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1646 julong reasonable_minimum = (julong)(OldSize + NewSize); 1647 1648 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1649 1650 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1651 1652 if (InitialHeapSize == 0) { 1653 julong reasonable_initial = phys_mem / InitialRAMFraction; 1654 1655 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1656 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1657 1658 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1659 1660 if (PrintGCDetails && Verbose) { 1661 // Cannot use gclog_or_tty yet. 1662 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1663 } 1664 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1665 } 1666 // If the minimum heap size has not been set (via -Xms), 1667 // synchronize with InitialHeapSize to avoid errors with the default value. 1668 if (min_heap_size() == 0) { 1669 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1670 if (PrintGCDetails && Verbose) { 1671 // Cannot use gclog_or_tty yet. 1672 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1673 } 1674 } 1675 } 1676 } 1677 1678 // This must be called after ergonomics because we want bytecode rewriting 1679 // if the server compiler is used, or if UseSharedSpaces is disabled. 1680 void Arguments::set_bytecode_flags() { 1681 // Better not attempt to store into a read-only space. 1682 if (UseSharedSpaces) { 1683 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1684 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1685 } 1686 1687 if (!RewriteBytecodes) { 1688 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1689 } 1690 } 1691 1692 // Aggressive optimization flags -XX:+AggressiveOpts 1693 void Arguments::set_aggressive_opts_flags() { 1694 #ifdef COMPILER2 1695 if (AggressiveUnboxing) { 1696 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1697 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1698 } else if (!EliminateAutoBox) { 1699 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1700 AggressiveUnboxing = false; 1701 } 1702 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1703 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1704 } else if (!DoEscapeAnalysis) { 1705 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1706 AggressiveUnboxing = false; 1707 } 1708 } 1709 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1710 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1711 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1712 } 1713 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1714 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1715 } 1716 1717 // Feed the cache size setting into the JDK 1718 char buffer[1024]; 1719 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1720 add_property(buffer); 1721 } 1722 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1723 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1724 } 1725 #endif 1726 1727 if (AggressiveOpts) { 1728 // Sample flag setting code 1729 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1730 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1731 // } 1732 } 1733 } 1734 1735 //=========================================================================================================== 1736 // Parsing of java.compiler property 1737 1738 void Arguments::process_java_compiler_argument(char* arg) { 1739 // For backwards compatibility, Djava.compiler=NONE or "" 1740 // causes us to switch to -Xint mode UNLESS -Xdebug 1741 // is also specified. 1742 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1743 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1744 } 1745 } 1746 1747 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1748 _sun_java_launcher = strdup(launcher); 1749 if (strcmp("gamma", _sun_java_launcher) == 0) { 1750 _created_by_gamma_launcher = true; 1751 } 1752 } 1753 1754 bool Arguments::created_by_java_launcher() { 1755 assert(_sun_java_launcher != NULL, "property must have value"); 1756 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1757 } 1758 1759 bool Arguments::created_by_gamma_launcher() { 1760 return _created_by_gamma_launcher; 1761 } 1762 1763 //=========================================================================================================== 1764 // Parsing of main arguments 1765 1766 bool Arguments::verify_interval(uintx val, uintx min, 1767 uintx max, const char* name) { 1768 // Returns true iff value is in the inclusive interval [min..max] 1769 // false, otherwise. 1770 if (val >= min && val <= max) { 1771 return true; 1772 } 1773 jio_fprintf(defaultStream::error_stream(), 1774 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1775 " and " UINTX_FORMAT "\n", 1776 name, val, min, max); 1777 return false; 1778 } 1779 1780 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1781 // Returns true if given value is at least specified min threshold 1782 // false, otherwise. 1783 if (val >= min ) { 1784 return true; 1785 } 1786 jio_fprintf(defaultStream::error_stream(), 1787 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1788 name, val, min); 1789 return false; 1790 } 1791 1792 bool Arguments::verify_percentage(uintx value, const char* name) { 1793 if (value <= 100) { 1794 return true; 1795 } 1796 jio_fprintf(defaultStream::error_stream(), 1797 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1798 name, value); 1799 return false; 1800 } 1801 1802 #if !INCLUDE_ALL_GCS 1803 #ifdef ASSERT 1804 static bool verify_serial_gc_flags() { 1805 return (UseSerialGC && 1806 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1807 UseParallelGC || UseParallelOldGC)); 1808 } 1809 #endif // ASSERT 1810 #endif // INCLUDE_ALL_GCS 1811 1812 // check if do gclog rotation 1813 // +UseGCLogFileRotation is a must, 1814 // no gc log rotation when log file not supplied or 1815 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1816 void check_gclog_consistency() { 1817 if (UseGCLogFileRotation) { 1818 if ((Arguments::gc_log_filename() == NULL) || 1819 (NumberOfGCLogFiles == 0) || 1820 (GCLogFileSize == 0)) { 1821 jio_fprintf(defaultStream::output_stream(), 1822 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1823 "where num_of_file > 0 and num_of_size > 0\n" 1824 "GC log rotation is turned off\n"); 1825 UseGCLogFileRotation = false; 1826 } 1827 } 1828 1829 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1830 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1831 jio_fprintf(defaultStream::output_stream(), 1832 "GCLogFileSize changed to minimum 8K\n"); 1833 } 1834 } 1835 1836 // Check consistency of GC selection 1837 bool Arguments::check_gc_consistency() { 1838 check_gclog_consistency(); 1839 bool status = true; 1840 // Ensure that the user has not selected conflicting sets 1841 // of collectors. [Note: this check is merely a user convenience; 1842 // collectors over-ride each other so that only a non-conflicting 1843 // set is selected; however what the user gets is not what they 1844 // may have expected from the combination they asked for. It's 1845 // better to reduce user confusion by not allowing them to 1846 // select conflicting combinations. 1847 uint i = 0; 1848 if (UseSerialGC) i++; 1849 if (UseConcMarkSweepGC || UseParNewGC) i++; 1850 if (UseParallelGC || UseParallelOldGC) i++; 1851 if (UseG1GC) i++; 1852 if (i > 1) { 1853 jio_fprintf(defaultStream::error_stream(), 1854 "Conflicting collector combinations in option list; " 1855 "please refer to the release notes for the combinations " 1856 "allowed\n"); 1857 status = false; 1858 } 1859 1860 return status; 1861 } 1862 1863 void Arguments::check_deprecated_gcs() { 1864 if (UseConcMarkSweepGC && !UseParNewGC) { 1865 warning("Using the DefNew young collector with the CMS collector is deprecated " 1866 "and will likely be removed in a future release"); 1867 } 1868 1869 if (UseParNewGC && !UseConcMarkSweepGC) { 1870 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1871 // set up UseSerialGC properly, so that can't be used in the check here. 1872 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1873 "and will likely be removed in a future release"); 1874 } 1875 1876 if (CMSIncrementalMode) { 1877 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1878 } 1879 } 1880 1881 void Arguments::check_deprecated_gc_flags() { 1882 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1883 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1884 "and will likely be removed in future release"); 1885 } 1886 } 1887 1888 // Check stack pages settings 1889 bool Arguments::check_stack_pages() 1890 { 1891 bool status = true; 1892 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1893 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1894 // greater stack shadow pages can't generate instruction to bang stack 1895 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1896 return status; 1897 } 1898 1899 // Check the consistency of vm_init_args 1900 bool Arguments::check_vm_args_consistency() { 1901 // Method for adding checks for flag consistency. 1902 // The intent is to warn the user of all possible conflicts, 1903 // before returning an error. 1904 // Note: Needs platform-dependent factoring. 1905 bool status = true; 1906 1907 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1908 // builds so the cost of stack banging can be measured. 1909 #if (defined(PRODUCT) && defined(SOLARIS)) 1910 if (!UseBoundThreads && !UseStackBanging) { 1911 jio_fprintf(defaultStream::error_stream(), 1912 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1913 1914 status = false; 1915 } 1916 #endif 1917 1918 if (TLABRefillWasteFraction == 0) { 1919 jio_fprintf(defaultStream::error_stream(), 1920 "TLABRefillWasteFraction should be a denominator, " 1921 "not " SIZE_FORMAT "\n", 1922 TLABRefillWasteFraction); 1923 status = false; 1924 } 1925 1926 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 1927 "AdaptiveSizePolicyWeight"); 1928 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1929 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1930 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1931 1932 // Divide by bucket size to prevent a large size from causing rollover when 1933 // calculating amount of memory needed to be allocated for the String table. 1934 status = status && verify_interval(StringTableSize, minimumStringTableSize, 1935 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1936 1937 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1938 jio_fprintf(defaultStream::error_stream(), 1939 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1940 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1941 MinHeapFreeRatio, MaxHeapFreeRatio); 1942 status = false; 1943 } 1944 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1945 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1946 1947 // Min/MaxMetaspaceFreeRatio 1948 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 1949 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 1950 1951 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 1952 jio_fprintf(defaultStream::error_stream(), 1953 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 1954 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 1955 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 1956 MinMetaspaceFreeRatio, 1957 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 1958 MaxMetaspaceFreeRatio); 1959 status = false; 1960 } 1961 1962 // Trying to keep 100% free is not practical 1963 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 1964 1965 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1966 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1967 } 1968 1969 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1970 // Settings to encourage splitting. 1971 if (!FLAG_IS_CMDLINE(NewRatio)) { 1972 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 1973 } 1974 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1975 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1976 } 1977 } 1978 1979 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1980 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1981 if (GCTimeLimit == 100) { 1982 // Turn off gc-overhead-limit-exceeded checks 1983 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1984 } 1985 1986 status = status && check_gc_consistency(); 1987 status = status && check_stack_pages(); 1988 1989 if (CMSIncrementalMode) { 1990 if (!UseConcMarkSweepGC) { 1991 jio_fprintf(defaultStream::error_stream(), 1992 "error: invalid argument combination.\n" 1993 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1994 "selected in order\nto use CMSIncrementalMode.\n"); 1995 status = false; 1996 } else { 1997 status = status && verify_percentage(CMSIncrementalDutyCycle, 1998 "CMSIncrementalDutyCycle"); 1999 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2000 "CMSIncrementalDutyCycleMin"); 2001 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2002 "CMSIncrementalSafetyFactor"); 2003 status = status && verify_percentage(CMSIncrementalOffset, 2004 "CMSIncrementalOffset"); 2005 status = status && verify_percentage(CMSExpAvgFactor, 2006 "CMSExpAvgFactor"); 2007 // If it was not set on the command line, set 2008 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2009 if (CMSInitiatingOccupancyFraction < 0) { 2010 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2011 } 2012 } 2013 } 2014 2015 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2016 // insists that we hold the requisite locks so that the iteration is 2017 // MT-safe. For the verification at start-up and shut-down, we don't 2018 // yet have a good way of acquiring and releasing these locks, 2019 // which are not visible at the CollectedHeap level. We want to 2020 // be able to acquire these locks and then do the iteration rather 2021 // than just disable the lock verification. This will be fixed under 2022 // bug 4788986. 2023 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2024 if (VerifyDuringStartup) { 2025 warning("Heap verification at start-up disabled " 2026 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2027 VerifyDuringStartup = false; // Disable verification at start-up 2028 } 2029 2030 if (VerifyBeforeExit) { 2031 warning("Heap verification at shutdown disabled " 2032 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2033 VerifyBeforeExit = false; // Disable verification at shutdown 2034 } 2035 } 2036 2037 // Note: only executed in non-PRODUCT mode 2038 if (!UseAsyncConcMarkSweepGC && 2039 (ExplicitGCInvokesConcurrent || 2040 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2041 jio_fprintf(defaultStream::error_stream(), 2042 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2043 " with -UseAsyncConcMarkSweepGC"); 2044 status = false; 2045 } 2046 2047 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2048 2049 #if INCLUDE_ALL_GCS 2050 if (UseG1GC) { 2051 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2052 "InitiatingHeapOccupancyPercent"); 2053 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2054 "G1RefProcDrainInterval"); 2055 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2056 "G1ConcMarkStepDurationMillis"); 2057 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2058 "G1ConcRSHotCardLimit"); 2059 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2060 "G1ConcRSLogCacheSize"); 2061 } 2062 if (UseConcMarkSweepGC) { 2063 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2064 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2065 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2066 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2067 2068 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2069 2070 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2071 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2072 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2073 2074 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2075 2076 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2077 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2078 2079 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2080 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2081 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2082 2083 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2084 2085 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2086 2087 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2088 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2089 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2090 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2091 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2092 } 2093 2094 if (UseParallelGC || UseParallelOldGC) { 2095 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2096 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2097 2098 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2099 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2100 2101 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2102 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2103 2104 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2105 2106 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2107 } 2108 #endif // INCLUDE_ALL_GCS 2109 2110 status = status && verify_interval(RefDiscoveryPolicy, 2111 ReferenceProcessor::DiscoveryPolicyMin, 2112 ReferenceProcessor::DiscoveryPolicyMax, 2113 "RefDiscoveryPolicy"); 2114 2115 // Limit the lower bound of this flag to 1 as it is used in a division 2116 // expression. 2117 status = status && verify_interval(TLABWasteTargetPercent, 2118 1, 100, "TLABWasteTargetPercent"); 2119 2120 status = status && verify_object_alignment(); 2121 2122 status = status && verify_min_value(ClassMetaspaceSize, 1*M, 2123 "ClassMetaspaceSize"); 2124 2125 status = status && verify_interval(MarkStackSizeMax, 2126 1, (max_jint - 1), "MarkStackSizeMax"); 2127 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2128 2129 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2130 2131 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2132 2133 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2134 2135 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2136 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2137 2138 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2139 2140 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2141 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2142 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2143 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2144 2145 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2146 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2147 2148 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2149 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2150 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2151 2152 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2153 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2154 2155 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2156 // just for that, so hardcode here. 2157 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2158 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2159 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2160 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2161 2162 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2163 #ifdef SPARC 2164 if (UseConcMarkSweepGC || UseG1GC) { 2165 // Issue a stern warning if the user has explicitly set 2166 // UseMemSetInBOT (it is known to cause issues), but allow 2167 // use for experimentation and debugging. 2168 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2169 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2170 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2171 " on sun4v; please understand that you are using at your own risk!"); 2172 } 2173 } 2174 #endif // SPARC 2175 2176 if (PrintNMTStatistics) { 2177 #if INCLUDE_NMT 2178 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2179 #endif // INCLUDE_NMT 2180 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2181 PrintNMTStatistics = false; 2182 #if INCLUDE_NMT 2183 } 2184 #endif 2185 } 2186 2187 // Need to limit the extent of the padding to reasonable size. 2188 // 8K is well beyond the reasonable HW cache line size, even with the 2189 // aggressive prefetching, while still leaving the room for segregating 2190 // among the distinct pages. 2191 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2192 jio_fprintf(defaultStream::error_stream(), 2193 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n", 2194 ContendedPaddingWidth, 0, 8192); 2195 status = false; 2196 } 2197 2198 // Need to enforce the padding not to break the existing field alignments. 2199 // It is sufficient to check against the largest type size. 2200 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2201 jio_fprintf(defaultStream::error_stream(), 2202 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n", 2203 ContendedPaddingWidth, BytesPerLong); 2204 status = false; 2205 } 2206 2207 // Check lower bounds of the code cache 2208 // Template Interpreter code is approximately 3X larger in debug builds. 2209 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2210 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2211 jio_fprintf(defaultStream::error_stream(), 2212 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2213 os::vm_page_size()/K); 2214 status = false; 2215 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2216 jio_fprintf(defaultStream::error_stream(), 2217 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2218 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2219 status = false; 2220 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2221 jio_fprintf(defaultStream::error_stream(), 2222 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2223 min_code_cache_size/K); 2224 status = false; 2225 } 2226 2227 return status; 2228 } 2229 2230 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2231 const char* option_type) { 2232 if (ignore) return false; 2233 2234 const char* spacer = " "; 2235 if (option_type == NULL) { 2236 option_type = ++spacer; // Set both to the empty string. 2237 } 2238 2239 if (os::obsolete_option(option)) { 2240 jio_fprintf(defaultStream::error_stream(), 2241 "Obsolete %s%soption: %s\n", option_type, spacer, 2242 option->optionString); 2243 return false; 2244 } else { 2245 jio_fprintf(defaultStream::error_stream(), 2246 "Unrecognized %s%soption: %s\n", option_type, spacer, 2247 option->optionString); 2248 return true; 2249 } 2250 } 2251 2252 static const char* user_assertion_options[] = { 2253 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2254 }; 2255 2256 static const char* system_assertion_options[] = { 2257 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2258 }; 2259 2260 // Return true if any of the strings in null-terminated array 'names' matches. 2261 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2262 // the option must match exactly. 2263 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2264 bool tail_allowed) { 2265 for (/* empty */; *names != NULL; ++names) { 2266 if (match_option(option, *names, tail)) { 2267 if (**tail == '\0' || tail_allowed && **tail == ':') { 2268 return true; 2269 } 2270 } 2271 } 2272 return false; 2273 } 2274 2275 bool Arguments::parse_uintx(const char* value, 2276 uintx* uintx_arg, 2277 uintx min_size) { 2278 2279 // Check the sign first since atomull() parses only unsigned values. 2280 bool value_is_positive = !(*value == '-'); 2281 2282 if (value_is_positive) { 2283 julong n; 2284 bool good_return = atomull(value, &n); 2285 if (good_return) { 2286 bool above_minimum = n >= min_size; 2287 bool value_is_too_large = n > max_uintx; 2288 2289 if (above_minimum && !value_is_too_large) { 2290 *uintx_arg = n; 2291 return true; 2292 } 2293 } 2294 } 2295 return false; 2296 } 2297 2298 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2299 julong* long_arg, 2300 julong min_size) { 2301 if (!atomull(s, long_arg)) return arg_unreadable; 2302 return check_memory_size(*long_arg, min_size); 2303 } 2304 2305 // Parse JavaVMInitArgs structure 2306 2307 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2308 // For components of the system classpath. 2309 SysClassPath scp(Arguments::get_sysclasspath()); 2310 bool scp_assembly_required = false; 2311 2312 // Save default settings for some mode flags 2313 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2314 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2315 Arguments::_ClipInlining = ClipInlining; 2316 Arguments::_BackgroundCompilation = BackgroundCompilation; 2317 2318 // Setup flags for mixed which is the default 2319 set_mode_flags(_mixed); 2320 2321 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2322 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2323 if (result != JNI_OK) { 2324 return result; 2325 } 2326 2327 // Parse JavaVMInitArgs structure passed in 2328 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2329 if (result != JNI_OK) { 2330 return result; 2331 } 2332 2333 if (AggressiveOpts) { 2334 // Insert alt-rt.jar between user-specified bootclasspath 2335 // prefix and the default bootclasspath. os::set_boot_path() 2336 // uses meta_index_dir as the default bootclasspath directory. 2337 const char* altclasses_jar = "alt-rt.jar"; 2338 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2339 strlen(altclasses_jar); 2340 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2341 strcpy(altclasses_path, get_meta_index_dir()); 2342 strcat(altclasses_path, altclasses_jar); 2343 scp.add_suffix_to_prefix(altclasses_path); 2344 scp_assembly_required = true; 2345 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2346 } 2347 2348 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2349 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2350 if (result != JNI_OK) { 2351 return result; 2352 } 2353 2354 // Do final processing now that all arguments have been parsed 2355 result = finalize_vm_init_args(&scp, scp_assembly_required); 2356 if (result != JNI_OK) { 2357 return result; 2358 } 2359 2360 return JNI_OK; 2361 } 2362 2363 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2364 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2365 // are dealing with -agentpath (case where name is a path), otherwise with 2366 // -agentlib 2367 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2368 char *_name; 2369 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2370 size_t _len_hprof, _len_jdwp, _len_prefix; 2371 2372 if (is_path) { 2373 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2374 return false; 2375 } 2376 2377 _name++; // skip past last path separator 2378 _len_prefix = strlen(JNI_LIB_PREFIX); 2379 2380 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2381 return false; 2382 } 2383 2384 _name += _len_prefix; 2385 _len_hprof = strlen(_hprof); 2386 _len_jdwp = strlen(_jdwp); 2387 2388 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2389 _name += _len_hprof; 2390 } 2391 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2392 _name += _len_jdwp; 2393 } 2394 else { 2395 return false; 2396 } 2397 2398 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2399 return false; 2400 } 2401 2402 return true; 2403 } 2404 2405 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2406 return true; 2407 } 2408 2409 return false; 2410 } 2411 2412 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2413 SysClassPath* scp_p, 2414 bool* scp_assembly_required_p, 2415 FlagValueOrigin origin) { 2416 // Remaining part of option string 2417 const char* tail; 2418 2419 // iterate over arguments 2420 for (int index = 0; index < args->nOptions; index++) { 2421 bool is_absolute_path = false; // for -agentpath vs -agentlib 2422 2423 const JavaVMOption* option = args->options + index; 2424 2425 if (!match_option(option, "-Djava.class.path", &tail) && 2426 !match_option(option, "-Dsun.java.command", &tail) && 2427 !match_option(option, "-Dsun.java.launcher", &tail)) { 2428 2429 // add all jvm options to the jvm_args string. This string 2430 // is used later to set the java.vm.args PerfData string constant. 2431 // the -Djava.class.path and the -Dsun.java.command options are 2432 // omitted from jvm_args string as each have their own PerfData 2433 // string constant object. 2434 build_jvm_args(option->optionString); 2435 } 2436 2437 // -verbose:[class/gc/jni] 2438 if (match_option(option, "-verbose", &tail)) { 2439 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2440 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2441 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2442 } else if (!strcmp(tail, ":gc")) { 2443 FLAG_SET_CMDLINE(bool, PrintGC, true); 2444 } else if (!strcmp(tail, ":jni")) { 2445 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2446 } 2447 // -da / -ea / -disableassertions / -enableassertions 2448 // These accept an optional class/package name separated by a colon, e.g., 2449 // -da:java.lang.Thread. 2450 } else if (match_option(option, user_assertion_options, &tail, true)) { 2451 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2452 if (*tail == '\0') { 2453 JavaAssertions::setUserClassDefault(enable); 2454 } else { 2455 assert(*tail == ':', "bogus match by match_option()"); 2456 JavaAssertions::addOption(tail + 1, enable); 2457 } 2458 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2459 } else if (match_option(option, system_assertion_options, &tail, false)) { 2460 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2461 JavaAssertions::setSystemClassDefault(enable); 2462 // -bootclasspath: 2463 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2464 scp_p->reset_path(tail); 2465 *scp_assembly_required_p = true; 2466 // -bootclasspath/a: 2467 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2468 scp_p->add_suffix(tail); 2469 *scp_assembly_required_p = true; 2470 // -bootclasspath/p: 2471 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2472 scp_p->add_prefix(tail); 2473 *scp_assembly_required_p = true; 2474 // -Xrun 2475 } else if (match_option(option, "-Xrun", &tail)) { 2476 if (tail != NULL) { 2477 const char* pos = strchr(tail, ':'); 2478 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2479 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2480 name[len] = '\0'; 2481 2482 char *options = NULL; 2483 if(pos != NULL) { 2484 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2485 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2486 } 2487 #if !INCLUDE_JVMTI 2488 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2489 jio_fprintf(defaultStream::error_stream(), 2490 "Profiling and debugging agents are not supported in this VM\n"); 2491 return JNI_ERR; 2492 } 2493 #endif // !INCLUDE_JVMTI 2494 add_init_library(name, options); 2495 } 2496 // -agentlib and -agentpath 2497 } else if (match_option(option, "-agentlib:", &tail) || 2498 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2499 if(tail != NULL) { 2500 const char* pos = strchr(tail, '='); 2501 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2502 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2503 name[len] = '\0'; 2504 2505 char *options = NULL; 2506 if(pos != NULL) { 2507 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2508 } 2509 #if !INCLUDE_JVMTI 2510 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2511 jio_fprintf(defaultStream::error_stream(), 2512 "Profiling and debugging agents are not supported in this VM\n"); 2513 return JNI_ERR; 2514 } 2515 #endif // !INCLUDE_JVMTI 2516 add_init_agent(name, options, is_absolute_path); 2517 } 2518 // -javaagent 2519 } else if (match_option(option, "-javaagent:", &tail)) { 2520 #if !INCLUDE_JVMTI 2521 jio_fprintf(defaultStream::error_stream(), 2522 "Instrumentation agents are not supported in this VM\n"); 2523 return JNI_ERR; 2524 #else 2525 if(tail != NULL) { 2526 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2527 add_init_agent("instrument", options, false); 2528 } 2529 #endif // !INCLUDE_JVMTI 2530 // -Xnoclassgc 2531 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2532 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2533 // -Xincgc: i-CMS 2534 } else if (match_option(option, "-Xincgc", &tail)) { 2535 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2536 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2537 // -Xnoincgc: no i-CMS 2538 } else if (match_option(option, "-Xnoincgc", &tail)) { 2539 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2540 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2541 // -Xconcgc 2542 } else if (match_option(option, "-Xconcgc", &tail)) { 2543 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2544 // -Xnoconcgc 2545 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2546 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2547 // -Xbatch 2548 } else if (match_option(option, "-Xbatch", &tail)) { 2549 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2550 // -Xmn for compatibility with other JVM vendors 2551 } else if (match_option(option, "-Xmn", &tail)) { 2552 julong long_initial_eden_size = 0; 2553 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2554 if (errcode != arg_in_range) { 2555 jio_fprintf(defaultStream::error_stream(), 2556 "Invalid initial eden size: %s\n", option->optionString); 2557 describe_range_error(errcode); 2558 return JNI_EINVAL; 2559 } 2560 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2561 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2562 // -Xms 2563 } else if (match_option(option, "-Xms", &tail)) { 2564 julong long_initial_heap_size = 0; 2565 // an initial heap size of 0 means automatically determine 2566 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2567 if (errcode != arg_in_range) { 2568 jio_fprintf(defaultStream::error_stream(), 2569 "Invalid initial heap size: %s\n", option->optionString); 2570 describe_range_error(errcode); 2571 return JNI_EINVAL; 2572 } 2573 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2574 // Currently the minimum size and the initial heap sizes are the same. 2575 set_min_heap_size(InitialHeapSize); 2576 // -Xmx 2577 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2578 julong long_max_heap_size = 0; 2579 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2580 if (errcode != arg_in_range) { 2581 jio_fprintf(defaultStream::error_stream(), 2582 "Invalid maximum heap size: %s\n", option->optionString); 2583 describe_range_error(errcode); 2584 return JNI_EINVAL; 2585 } 2586 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2587 // Xmaxf 2588 } else if (match_option(option, "-Xmaxf", &tail)) { 2589 int maxf = (int)(atof(tail) * 100); 2590 if (maxf < 0 || maxf > 100) { 2591 jio_fprintf(defaultStream::error_stream(), 2592 "Bad max heap free percentage size: %s\n", 2593 option->optionString); 2594 return JNI_EINVAL; 2595 } else { 2596 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2597 } 2598 // Xminf 2599 } else if (match_option(option, "-Xminf", &tail)) { 2600 int minf = (int)(atof(tail) * 100); 2601 if (minf < 0 || minf > 100) { 2602 jio_fprintf(defaultStream::error_stream(), 2603 "Bad min heap free percentage size: %s\n", 2604 option->optionString); 2605 return JNI_EINVAL; 2606 } else { 2607 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2608 } 2609 // -Xss 2610 } else if (match_option(option, "-Xss", &tail)) { 2611 julong long_ThreadStackSize = 0; 2612 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2613 if (errcode != arg_in_range) { 2614 jio_fprintf(defaultStream::error_stream(), 2615 "Invalid thread stack size: %s\n", option->optionString); 2616 describe_range_error(errcode); 2617 return JNI_EINVAL; 2618 } 2619 // Internally track ThreadStackSize in units of 1024 bytes. 2620 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2621 round_to((int)long_ThreadStackSize, K) / K); 2622 // -Xoss 2623 } else if (match_option(option, "-Xoss", &tail)) { 2624 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2625 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2626 julong long_CodeCacheExpansionSize = 0; 2627 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2628 if (errcode != arg_in_range) { 2629 jio_fprintf(defaultStream::error_stream(), 2630 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2631 os::vm_page_size()/K); 2632 return JNI_EINVAL; 2633 } 2634 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2635 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2636 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2637 julong long_ReservedCodeCacheSize = 0; 2638 2639 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2640 if (errcode != arg_in_range) { 2641 jio_fprintf(defaultStream::error_stream(), 2642 "Invalid maximum code cache size: %s.\n", option->optionString); 2643 return JNI_EINVAL; 2644 } 2645 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2646 //-XX:IncreaseFirstTierCompileThresholdAt= 2647 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2648 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2649 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2650 jio_fprintf(defaultStream::error_stream(), 2651 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2652 option->optionString); 2653 return JNI_EINVAL; 2654 } 2655 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2656 // -green 2657 } else if (match_option(option, "-green", &tail)) { 2658 jio_fprintf(defaultStream::error_stream(), 2659 "Green threads support not available\n"); 2660 return JNI_EINVAL; 2661 // -native 2662 } else if (match_option(option, "-native", &tail)) { 2663 // HotSpot always uses native threads, ignore silently for compatibility 2664 // -Xsqnopause 2665 } else if (match_option(option, "-Xsqnopause", &tail)) { 2666 // EVM option, ignore silently for compatibility 2667 // -Xrs 2668 } else if (match_option(option, "-Xrs", &tail)) { 2669 // Classic/EVM option, new functionality 2670 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2671 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2672 // change default internal VM signals used - lower case for back compat 2673 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2674 // -Xoptimize 2675 } else if (match_option(option, "-Xoptimize", &tail)) { 2676 // EVM option, ignore silently for compatibility 2677 // -Xprof 2678 } else if (match_option(option, "-Xprof", &tail)) { 2679 #if INCLUDE_FPROF 2680 _has_profile = true; 2681 #else // INCLUDE_FPROF 2682 jio_fprintf(defaultStream::error_stream(), 2683 "Flat profiling is not supported in this VM.\n"); 2684 return JNI_ERR; 2685 #endif // INCLUDE_FPROF 2686 // -Xconcurrentio 2687 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2688 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2689 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2690 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2691 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2692 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2693 2694 // -Xinternalversion 2695 } else if (match_option(option, "-Xinternalversion", &tail)) { 2696 jio_fprintf(defaultStream::output_stream(), "%s\n", 2697 VM_Version::internal_vm_info_string()); 2698 vm_exit(0); 2699 #ifndef PRODUCT 2700 // -Xprintflags 2701 } else if (match_option(option, "-Xprintflags", &tail)) { 2702 CommandLineFlags::printFlags(tty, false); 2703 vm_exit(0); 2704 #endif 2705 // -D 2706 } else if (match_option(option, "-D", &tail)) { 2707 if (!add_property(tail)) { 2708 return JNI_ENOMEM; 2709 } 2710 // Out of the box management support 2711 if (match_option(option, "-Dcom.sun.management", &tail)) { 2712 #if INCLUDE_MANAGEMENT 2713 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2714 #else 2715 jio_fprintf(defaultStream::output_stream(), 2716 "-Dcom.sun.management is not supported in this VM.\n"); 2717 return JNI_ERR; 2718 #endif 2719 } 2720 // -Xint 2721 } else if (match_option(option, "-Xint", &tail)) { 2722 set_mode_flags(_int); 2723 // -Xmixed 2724 } else if (match_option(option, "-Xmixed", &tail)) { 2725 set_mode_flags(_mixed); 2726 // -Xcomp 2727 } else if (match_option(option, "-Xcomp", &tail)) { 2728 // for testing the compiler; turn off all flags that inhibit compilation 2729 set_mode_flags(_comp); 2730 // -Xshare:dump 2731 } else if (match_option(option, "-Xshare:dump", &tail)) { 2732 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2733 set_mode_flags(_int); // Prevent compilation, which creates objects 2734 // -Xshare:on 2735 } else if (match_option(option, "-Xshare:on", &tail)) { 2736 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2737 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2738 // -Xshare:auto 2739 } else if (match_option(option, "-Xshare:auto", &tail)) { 2740 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2741 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2742 // -Xshare:off 2743 } else if (match_option(option, "-Xshare:off", &tail)) { 2744 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2745 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2746 // -Xverify 2747 } else if (match_option(option, "-Xverify", &tail)) { 2748 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2749 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2750 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2751 } else if (strcmp(tail, ":remote") == 0) { 2752 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2753 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2754 } else if (strcmp(tail, ":none") == 0) { 2755 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2756 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2757 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2758 return JNI_EINVAL; 2759 } 2760 // -Xdebug 2761 } else if (match_option(option, "-Xdebug", &tail)) { 2762 // note this flag has been used, then ignore 2763 set_xdebug_mode(true); 2764 // -Xnoagent 2765 } else if (match_option(option, "-Xnoagent", &tail)) { 2766 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2767 } else if (match_option(option, "-Xboundthreads", &tail)) { 2768 // Bind user level threads to kernel threads (Solaris only) 2769 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2770 } else if (match_option(option, "-Xloggc:", &tail)) { 2771 // Redirect GC output to the file. -Xloggc:<filename> 2772 // ostream_init_log(), when called will use this filename 2773 // to initialize a fileStream. 2774 _gc_log_filename = strdup(tail); 2775 FLAG_SET_CMDLINE(bool, PrintGC, true); 2776 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2777 2778 // JNI hooks 2779 } else if (match_option(option, "-Xcheck", &tail)) { 2780 if (!strcmp(tail, ":jni")) { 2781 #if !INCLUDE_JNI_CHECK 2782 warning("JNI CHECKING is not supported in this VM"); 2783 #else 2784 CheckJNICalls = true; 2785 #endif // INCLUDE_JNI_CHECK 2786 } else if (is_bad_option(option, args->ignoreUnrecognized, 2787 "check")) { 2788 return JNI_EINVAL; 2789 } 2790 } else if (match_option(option, "vfprintf", &tail)) { 2791 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2792 } else if (match_option(option, "exit", &tail)) { 2793 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2794 } else if (match_option(option, "abort", &tail)) { 2795 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2796 // -XX:+AggressiveHeap 2797 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2798 2799 // This option inspects the machine and attempts to set various 2800 // parameters to be optimal for long-running, memory allocation 2801 // intensive jobs. It is intended for machines with large 2802 // amounts of cpu and memory. 2803 2804 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2805 // VM, but we may not be able to represent the total physical memory 2806 // available (like having 8gb of memory on a box but using a 32bit VM). 2807 // Thus, we need to make sure we're using a julong for intermediate 2808 // calculations. 2809 julong initHeapSize; 2810 julong total_memory = os::physical_memory(); 2811 2812 if (total_memory < (julong)256*M) { 2813 jio_fprintf(defaultStream::error_stream(), 2814 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2815 vm_exit(1); 2816 } 2817 2818 // The heap size is half of available memory, or (at most) 2819 // all of possible memory less 160mb (leaving room for the OS 2820 // when using ISM). This is the maximum; because adaptive sizing 2821 // is turned on below, the actual space used may be smaller. 2822 2823 initHeapSize = MIN2(total_memory / (julong)2, 2824 total_memory - (julong)160*M); 2825 2826 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2827 2828 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2829 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2830 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2831 // Currently the minimum size and the initial heap sizes are the same. 2832 set_min_heap_size(initHeapSize); 2833 } 2834 if (FLAG_IS_DEFAULT(NewSize)) { 2835 // Make the young generation 3/8ths of the total heap. 2836 FLAG_SET_CMDLINE(uintx, NewSize, 2837 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2838 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2839 } 2840 2841 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2842 FLAG_SET_DEFAULT(UseLargePages, true); 2843 #endif 2844 2845 // Increase some data structure sizes for efficiency 2846 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2847 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2848 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2849 2850 // See the OldPLABSize comment below, but replace 'after promotion' 2851 // with 'after copying'. YoungPLABSize is the size of the survivor 2852 // space per-gc-thread buffers. The default is 4kw. 2853 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2854 2855 // OldPLABSize is the size of the buffers in the old gen that 2856 // UseParallelGC uses to promote live data that doesn't fit in the 2857 // survivor spaces. At any given time, there's one for each gc thread. 2858 // The default size is 1kw. These buffers are rarely used, since the 2859 // survivor spaces are usually big enough. For specjbb, however, there 2860 // are occasions when there's lots of live data in the young gen 2861 // and we end up promoting some of it. We don't have a definite 2862 // explanation for why bumping OldPLABSize helps, but the theory 2863 // is that a bigger PLAB results in retaining something like the 2864 // original allocation order after promotion, which improves mutator 2865 // locality. A minor effect may be that larger PLABs reduce the 2866 // number of PLAB allocation events during gc. The value of 8kw 2867 // was arrived at by experimenting with specjbb. 2868 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2869 2870 // Enable parallel GC and adaptive generation sizing 2871 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2872 FLAG_SET_DEFAULT(ParallelGCThreads, 2873 Abstract_VM_Version::parallel_worker_threads()); 2874 2875 // Encourage steady state memory management 2876 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2877 2878 // This appears to improve mutator locality 2879 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2880 2881 // Get around early Solaris scheduling bug 2882 // (affinity vs other jobs on system) 2883 // but disallow DR and offlining (5008695). 2884 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2885 2886 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2887 // The last option must always win. 2888 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2889 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2890 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2891 // The last option must always win. 2892 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2893 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2894 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2895 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2896 jio_fprintf(defaultStream::error_stream(), 2897 "Please use CMSClassUnloadingEnabled in place of " 2898 "CMSPermGenSweepingEnabled in the future\n"); 2899 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2900 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2901 jio_fprintf(defaultStream::error_stream(), 2902 "Please use -XX:+UseGCOverheadLimit in place of " 2903 "-XX:+UseGCTimeLimit in the future\n"); 2904 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2905 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2906 jio_fprintf(defaultStream::error_stream(), 2907 "Please use -XX:-UseGCOverheadLimit in place of " 2908 "-XX:-UseGCTimeLimit in the future\n"); 2909 // The TLE options are for compatibility with 1.3 and will be 2910 // removed without notice in a future release. These options 2911 // are not to be documented. 2912 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2913 // No longer used. 2914 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2915 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2916 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2917 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2918 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2919 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2920 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2921 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2922 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2923 // No longer used. 2924 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2925 julong long_tlab_size = 0; 2926 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2927 if (errcode != arg_in_range) { 2928 jio_fprintf(defaultStream::error_stream(), 2929 "Invalid TLAB size: %s\n", option->optionString); 2930 describe_range_error(errcode); 2931 return JNI_EINVAL; 2932 } 2933 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2934 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2935 // No longer used. 2936 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2937 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2938 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2939 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2940 SOLARIS_ONLY( 2941 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2942 warning("-XX:+UsePermISM is obsolete."); 2943 FLAG_SET_CMDLINE(bool, UseISM, true); 2944 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2945 FLAG_SET_CMDLINE(bool, UseISM, false); 2946 ) 2947 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2948 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2949 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2950 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2951 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2952 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2953 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2954 #if defined(DTRACE_ENABLED) 2955 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2956 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2957 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2958 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2959 #else // defined(DTRACE_ENABLED) 2960 jio_fprintf(defaultStream::error_stream(), 2961 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2962 return JNI_EINVAL; 2963 #endif // defined(DTRACE_ENABLED) 2964 #ifdef ASSERT 2965 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2966 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2967 // disable scavenge before parallel mark-compact 2968 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2969 #endif 2970 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2971 julong cms_blocks_to_claim = (julong)atol(tail); 2972 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2973 jio_fprintf(defaultStream::error_stream(), 2974 "Please use -XX:OldPLABSize in place of " 2975 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2976 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2977 julong cms_blocks_to_claim = (julong)atol(tail); 2978 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2979 jio_fprintf(defaultStream::error_stream(), 2980 "Please use -XX:OldPLABSize in place of " 2981 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2982 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2983 julong old_plab_size = 0; 2984 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2985 if (errcode != arg_in_range) { 2986 jio_fprintf(defaultStream::error_stream(), 2987 "Invalid old PLAB size: %s\n", option->optionString); 2988 describe_range_error(errcode); 2989 return JNI_EINVAL; 2990 } 2991 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2992 jio_fprintf(defaultStream::error_stream(), 2993 "Please use -XX:OldPLABSize in place of " 2994 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2995 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2996 julong young_plab_size = 0; 2997 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2998 if (errcode != arg_in_range) { 2999 jio_fprintf(defaultStream::error_stream(), 3000 "Invalid young PLAB size: %s\n", option->optionString); 3001 describe_range_error(errcode); 3002 return JNI_EINVAL; 3003 } 3004 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3005 jio_fprintf(defaultStream::error_stream(), 3006 "Please use -XX:YoungPLABSize in place of " 3007 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3008 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3009 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3010 julong stack_size = 0; 3011 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3012 if (errcode != arg_in_range) { 3013 jio_fprintf(defaultStream::error_stream(), 3014 "Invalid mark stack size: %s\n", option->optionString); 3015 describe_range_error(errcode); 3016 return JNI_EINVAL; 3017 } 3018 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3019 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3020 julong max_stack_size = 0; 3021 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3022 if (errcode != arg_in_range) { 3023 jio_fprintf(defaultStream::error_stream(), 3024 "Invalid maximum mark stack size: %s\n", 3025 option->optionString); 3026 describe_range_error(errcode); 3027 return JNI_EINVAL; 3028 } 3029 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3030 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3031 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3032 uintx conc_threads = 0; 3033 if (!parse_uintx(tail, &conc_threads, 1)) { 3034 jio_fprintf(defaultStream::error_stream(), 3035 "Invalid concurrent threads: %s\n", option->optionString); 3036 return JNI_EINVAL; 3037 } 3038 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3039 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3040 julong max_direct_memory_size = 0; 3041 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3042 if (errcode != arg_in_range) { 3043 jio_fprintf(defaultStream::error_stream(), 3044 "Invalid maximum direct memory size: %s\n", 3045 option->optionString); 3046 describe_range_error(errcode); 3047 return JNI_EINVAL; 3048 } 3049 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3050 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3051 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3052 // away and will cause VM initialization failures! 3053 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3054 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3055 #if !INCLUDE_MANAGEMENT 3056 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3057 jio_fprintf(defaultStream::error_stream(), 3058 "ManagementServer is not supported in this VM.\n"); 3059 return JNI_ERR; 3060 #endif // INCLUDE_MANAGEMENT 3061 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3062 // Skip -XX:Flags= since that case has already been handled 3063 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3064 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3065 return JNI_EINVAL; 3066 } 3067 } 3068 // Unknown option 3069 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3070 return JNI_ERR; 3071 } 3072 } 3073 3074 // Change the default value for flags which have different default values 3075 // when working with older JDKs. 3076 #ifdef LINUX 3077 if (JDK_Version::current().compare_major(6) <= 0 && 3078 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3079 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3080 } 3081 #endif // LINUX 3082 return JNI_OK; 3083 } 3084 3085 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3086 // This must be done after all -D arguments have been processed. 3087 scp_p->expand_endorsed(); 3088 3089 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3090 // Assemble the bootclasspath elements into the final path. 3091 Arguments::set_sysclasspath(scp_p->combined_path()); 3092 } 3093 3094 // This must be done after all arguments have been processed. 3095 // java_compiler() true means set to "NONE" or empty. 3096 if (java_compiler() && !xdebug_mode()) { 3097 // For backwards compatibility, we switch to interpreted mode if 3098 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3099 // not specified. 3100 set_mode_flags(_int); 3101 } 3102 if (CompileThreshold == 0) { 3103 set_mode_flags(_int); 3104 } 3105 3106 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3107 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3108 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3109 } 3110 3111 #ifndef COMPILER2 3112 // Don't degrade server performance for footprint 3113 if (FLAG_IS_DEFAULT(UseLargePages) && 3114 MaxHeapSize < LargePageHeapSizeThreshold) { 3115 // No need for large granularity pages w/small heaps. 3116 // Note that large pages are enabled/disabled for both the 3117 // Java heap and the code cache. 3118 FLAG_SET_DEFAULT(UseLargePages, false); 3119 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 3120 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 3121 } 3122 3123 // Tiered compilation is undefined with C1. 3124 TieredCompilation = false; 3125 #else 3126 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3127 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3128 } 3129 #endif 3130 3131 // If we are running in a headless jre, force java.awt.headless property 3132 // to be true unless the property has already been set. 3133 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3134 if (os::is_headless_jre()) { 3135 const char* headless = Arguments::get_property("java.awt.headless"); 3136 if (headless == NULL) { 3137 char envbuffer[128]; 3138 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3139 if (!add_property("java.awt.headless=true")) { 3140 return JNI_ENOMEM; 3141 } 3142 } else { 3143 char buffer[256]; 3144 strcpy(buffer, "java.awt.headless="); 3145 strcat(buffer, envbuffer); 3146 if (!add_property(buffer)) { 3147 return JNI_ENOMEM; 3148 } 3149 } 3150 } 3151 } 3152 3153 if (!check_vm_args_consistency()) { 3154 return JNI_ERR; 3155 } 3156 3157 return JNI_OK; 3158 } 3159 3160 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3161 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3162 scp_assembly_required_p); 3163 } 3164 3165 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3166 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3167 scp_assembly_required_p); 3168 } 3169 3170 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3171 const int N_MAX_OPTIONS = 64; 3172 const int OPTION_BUFFER_SIZE = 1024; 3173 char buffer[OPTION_BUFFER_SIZE]; 3174 3175 // The variable will be ignored if it exceeds the length of the buffer. 3176 // Don't check this variable if user has special privileges 3177 // (e.g. unix su command). 3178 if (os::getenv(name, buffer, sizeof(buffer)) && 3179 !os::have_special_privileges()) { 3180 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3181 jio_fprintf(defaultStream::error_stream(), 3182 "Picked up %s: %s\n", name, buffer); 3183 char* rd = buffer; // pointer to the input string (rd) 3184 int i; 3185 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3186 while (isspace(*rd)) rd++; // skip whitespace 3187 if (*rd == 0) break; // we re done when the input string is read completely 3188 3189 // The output, option string, overwrites the input string. 3190 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3191 // input string (rd). 3192 char* wrt = rd; 3193 3194 options[i++].optionString = wrt; // Fill in option 3195 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3196 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3197 int quote = *rd; // matching quote to look for 3198 rd++; // don't copy open quote 3199 while (*rd != quote) { // include everything (even spaces) up until quote 3200 if (*rd == 0) { // string termination means unmatched string 3201 jio_fprintf(defaultStream::error_stream(), 3202 "Unmatched quote in %s\n", name); 3203 return JNI_ERR; 3204 } 3205 *wrt++ = *rd++; // copy to option string 3206 } 3207 rd++; // don't copy close quote 3208 } else { 3209 *wrt++ = *rd++; // copy to option string 3210 } 3211 } 3212 // Need to check if we're done before writing a NULL, 3213 // because the write could be to the byte that rd is pointing to. 3214 if (*rd++ == 0) { 3215 *wrt = 0; 3216 break; 3217 } 3218 *wrt = 0; // Zero terminate option 3219 } 3220 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3221 JavaVMInitArgs vm_args; 3222 vm_args.version = JNI_VERSION_1_2; 3223 vm_args.options = options; 3224 vm_args.nOptions = i; 3225 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3226 3227 if (PrintVMOptions) { 3228 const char* tail; 3229 for (int i = 0; i < vm_args.nOptions; i++) { 3230 const JavaVMOption *option = vm_args.options + i; 3231 if (match_option(option, "-XX:", &tail)) { 3232 logOption(tail); 3233 } 3234 } 3235 } 3236 3237 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3238 } 3239 return JNI_OK; 3240 } 3241 3242 void Arguments::set_shared_spaces_flags() { 3243 #ifdef _LP64 3244 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 3245 3246 // CompressedOops cannot be used with CDS. The offsets of oopmaps and 3247 // static fields are incorrect in the archive. With some more clever 3248 // initialization, this restriction can probably be lifted. 3249 if (UseCompressedOops) { 3250 if (must_share) { 3251 warning("disabling compressed oops because of %s", 3252 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 3253 FLAG_SET_CMDLINE(bool, UseCompressedOops, false); 3254 FLAG_SET_CMDLINE(bool, UseCompressedKlassPointers, false); 3255 } else { 3256 // Prefer compressed oops to class data sharing 3257 if (UseSharedSpaces && Verbose) { 3258 warning("turning off use of shared archive because of compressed oops"); 3259 } 3260 no_shared_spaces(); 3261 } 3262 } 3263 #endif 3264 3265 if (DumpSharedSpaces) { 3266 if (RequireSharedSpaces) { 3267 warning("cannot dump shared archive while using shared archive"); 3268 } 3269 UseSharedSpaces = false; 3270 } 3271 } 3272 3273 // Disable options not supported in this release, with a warning if they 3274 // were explicitly requested on the command-line 3275 #define UNSUPPORTED_OPTION(opt, description) \ 3276 do { \ 3277 if (opt) { \ 3278 if (FLAG_IS_CMDLINE(opt)) { \ 3279 warning(description " is disabled in this release."); \ 3280 } \ 3281 FLAG_SET_DEFAULT(opt, false); \ 3282 } \ 3283 } while(0) 3284 3285 3286 #define UNSUPPORTED_GC_OPTION(gc) \ 3287 do { \ 3288 if (gc) { \ 3289 if (FLAG_IS_CMDLINE(gc)) { \ 3290 warning(#gc " is not supported in this VM. Using Serial GC."); \ 3291 } \ 3292 FLAG_SET_DEFAULT(gc, false); \ 3293 } \ 3294 } while(0) 3295 3296 #if !INCLUDE_ALL_GCS 3297 static void force_serial_gc() { 3298 FLAG_SET_DEFAULT(UseSerialGC, true); 3299 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3300 UNSUPPORTED_GC_OPTION(UseG1GC); 3301 UNSUPPORTED_GC_OPTION(UseParallelGC); 3302 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3303 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3304 UNSUPPORTED_GC_OPTION(UseParNewGC); 3305 } 3306 #endif // INCLUDE_ALL_GCS 3307 3308 // Sharing support 3309 // Construct the path to the archive 3310 static char* get_shared_archive_path() { 3311 char *shared_archive_path; 3312 if (SharedArchiveFile == NULL) { 3313 char jvm_path[JVM_MAXPATHLEN]; 3314 os::jvm_path(jvm_path, sizeof(jvm_path)); 3315 char *end = strrchr(jvm_path, *os::file_separator()); 3316 if (end != NULL) *end = '\0'; 3317 size_t jvm_path_len = strlen(jvm_path); 3318 size_t file_sep_len = strlen(os::file_separator()); 3319 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3320 file_sep_len + 20, mtInternal); 3321 if (shared_archive_path != NULL) { 3322 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3323 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3324 strncat(shared_archive_path, "classes.jsa", 11); 3325 } 3326 } else { 3327 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3328 if (shared_archive_path != NULL) { 3329 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3330 } 3331 } 3332 return shared_archive_path; 3333 } 3334 3335 // Parse entry point called from JNI_CreateJavaVM 3336 3337 jint Arguments::parse(const JavaVMInitArgs* args) { 3338 3339 // Remaining part of option string 3340 const char* tail; 3341 3342 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3343 const char* hotspotrc = ".hotspotrc"; 3344 bool settings_file_specified = false; 3345 bool needs_hotspotrc_warning = false; 3346 3347 const char* flags_file; 3348 int index; 3349 for (index = 0; index < args->nOptions; index++) { 3350 const JavaVMOption *option = args->options + index; 3351 if (match_option(option, "-XX:Flags=", &tail)) { 3352 flags_file = tail; 3353 settings_file_specified = true; 3354 } 3355 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3356 PrintVMOptions = true; 3357 } 3358 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3359 PrintVMOptions = false; 3360 } 3361 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3362 IgnoreUnrecognizedVMOptions = true; 3363 } 3364 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3365 IgnoreUnrecognizedVMOptions = false; 3366 } 3367 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3368 CommandLineFlags::printFlags(tty, false); 3369 vm_exit(0); 3370 } 3371 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3372 #if INCLUDE_NMT 3373 MemTracker::init_tracking_options(tail); 3374 #else 3375 jio_fprintf(defaultStream::error_stream(), 3376 "Native Memory Tracking is not supported in this VM\n"); 3377 return JNI_ERR; 3378 #endif 3379 } 3380 3381 3382 #ifndef PRODUCT 3383 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3384 CommandLineFlags::printFlags(tty, true); 3385 vm_exit(0); 3386 } 3387 #endif 3388 } 3389 3390 if (IgnoreUnrecognizedVMOptions) { 3391 // uncast const to modify the flag args->ignoreUnrecognized 3392 *(jboolean*)(&args->ignoreUnrecognized) = true; 3393 } 3394 3395 // Parse specified settings file 3396 if (settings_file_specified) { 3397 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3398 return JNI_EINVAL; 3399 } 3400 } else { 3401 #ifdef ASSERT 3402 // Parse default .hotspotrc settings file 3403 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3404 return JNI_EINVAL; 3405 } 3406 #else 3407 struct stat buf; 3408 if (os::stat(hotspotrc, &buf) == 0) { 3409 needs_hotspotrc_warning = true; 3410 } 3411 #endif 3412 } 3413 3414 if (PrintVMOptions) { 3415 for (index = 0; index < args->nOptions; index++) { 3416 const JavaVMOption *option = args->options + index; 3417 if (match_option(option, "-XX:", &tail)) { 3418 logOption(tail); 3419 } 3420 } 3421 } 3422 3423 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3424 jint result = parse_vm_init_args(args); 3425 if (result != JNI_OK) { 3426 return result; 3427 } 3428 3429 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3430 SharedArchivePath = get_shared_archive_path(); 3431 if (SharedArchivePath == NULL) { 3432 return JNI_ENOMEM; 3433 } 3434 3435 // Delay warning until here so that we've had a chance to process 3436 // the -XX:-PrintWarnings flag 3437 if (needs_hotspotrc_warning) { 3438 warning("%s file is present but has been ignored. " 3439 "Run with -XX:Flags=%s to load the file.", 3440 hotspotrc, hotspotrc); 3441 } 3442 3443 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3444 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3445 #endif 3446 3447 #if INCLUDE_ALL_GCS 3448 #if (defined JAVASE_EMBEDDED || defined ARM) 3449 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3450 #endif 3451 #endif 3452 3453 #ifndef PRODUCT 3454 if (TraceBytecodesAt != 0) { 3455 TraceBytecodes = true; 3456 } 3457 if (CountCompiledCalls) { 3458 if (UseCounterDecay) { 3459 warning("UseCounterDecay disabled because CountCalls is set"); 3460 UseCounterDecay = false; 3461 } 3462 } 3463 #endif // PRODUCT 3464 3465 // JSR 292 is not supported before 1.7 3466 if (!JDK_Version::is_gte_jdk17x_version()) { 3467 if (EnableInvokeDynamic) { 3468 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3469 warning("JSR 292 is not supported before 1.7. Disabling support."); 3470 } 3471 EnableInvokeDynamic = false; 3472 } 3473 } 3474 3475 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3476 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3477 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3478 } 3479 ScavengeRootsInCode = 1; 3480 } 3481 3482 if (PrintGCDetails) { 3483 // Turn on -verbose:gc options as well 3484 PrintGC = true; 3485 } 3486 3487 if (!JDK_Version::is_gte_jdk18x_version()) { 3488 // To avoid changing the log format for 7 updates this flag is only 3489 // true by default in JDK8 and above. 3490 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3491 FLAG_SET_DEFAULT(PrintGCCause, false); 3492 } 3493 } 3494 3495 // Set object alignment values. 3496 set_object_alignment(); 3497 3498 #if !INCLUDE_ALL_GCS 3499 force_serial_gc(); 3500 #endif // INCLUDE_ALL_GCS 3501 #if !INCLUDE_CDS 3502 if (DumpSharedSpaces || RequireSharedSpaces) { 3503 jio_fprintf(defaultStream::error_stream(), 3504 "Shared spaces are not supported in this VM\n"); 3505 return JNI_ERR; 3506 } 3507 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3508 warning("Shared spaces are not supported in this VM"); 3509 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3510 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3511 } 3512 no_shared_spaces(); 3513 #endif // INCLUDE_CDS 3514 3515 // Set flags based on ergonomics. 3516 set_ergonomics_flags(); 3517 3518 set_shared_spaces_flags(); 3519 3520 // Check the GC selections again. 3521 if (!check_gc_consistency()) { 3522 return JNI_EINVAL; 3523 } 3524 3525 if (TieredCompilation) { 3526 set_tiered_flags(); 3527 } else { 3528 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3529 if (CompilationPolicyChoice >= 2) { 3530 vm_exit_during_initialization( 3531 "Incompatible compilation policy selected", NULL); 3532 } 3533 } 3534 3535 set_heap_base_min_address(); 3536 3537 // Set heap size based on available physical memory 3538 set_heap_size(); 3539 3540 #if INCLUDE_ALL_GCS 3541 // Set per-collector flags 3542 if (UseParallelGC || UseParallelOldGC) { 3543 set_parallel_gc_flags(); 3544 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3545 set_cms_and_parnew_gc_flags(); 3546 } else if (UseParNewGC) { // skipped if CMS is set above 3547 set_parnew_gc_flags(); 3548 } else if (UseG1GC) { 3549 set_g1_gc_flags(); 3550 } 3551 check_deprecated_gcs(); 3552 check_deprecated_gc_flags(); 3553 if (AssumeMP && !UseSerialGC) { 3554 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3555 warning("If the number of processors is expected to increase from one, then" 3556 " you should configure the number of parallel GC threads appropriately" 3557 " using -XX:ParallelGCThreads=N"); 3558 } 3559 } 3560 #else // INCLUDE_ALL_GCS 3561 assert(verify_serial_gc_flags(), "SerialGC unset"); 3562 #endif // INCLUDE_ALL_GCS 3563 3564 // Set bytecode rewriting flags 3565 set_bytecode_flags(); 3566 3567 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3568 set_aggressive_opts_flags(); 3569 3570 // Turn off biased locking for locking debug mode flags, 3571 // which are subtlely different from each other but neither works with 3572 // biased locking. 3573 if (UseHeavyMonitors 3574 #ifdef COMPILER1 3575 || !UseFastLocking 3576 #endif // COMPILER1 3577 ) { 3578 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3579 // flag set to true on command line; warn the user that they 3580 // can't enable biased locking here 3581 warning("Biased Locking is not supported with locking debug flags" 3582 "; ignoring UseBiasedLocking flag." ); 3583 } 3584 UseBiasedLocking = false; 3585 } 3586 3587 #ifdef CC_INTERP 3588 // Clear flags not supported by the C++ interpreter 3589 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3590 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3591 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3592 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3593 #endif // CC_INTERP 3594 3595 #ifdef COMPILER2 3596 if (!UseBiasedLocking || EmitSync != 0) { 3597 UseOptoBiasInlining = false; 3598 } 3599 if (!EliminateLocks) { 3600 EliminateNestedLocks = false; 3601 } 3602 if (!Inline) { 3603 IncrementalInline = false; 3604 } 3605 #ifndef PRODUCT 3606 if (!IncrementalInline) { 3607 AlwaysIncrementalInline = false; 3608 } 3609 #endif 3610 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3611 // incremental inlining: bump MaxNodeLimit 3612 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3613 } 3614 #endif 3615 3616 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3617 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3618 DebugNonSafepoints = true; 3619 } 3620 3621 #ifndef PRODUCT 3622 if (CompileTheWorld) { 3623 // Force NmethodSweeper to sweep whole CodeCache each time. 3624 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3625 NmethodSweepFraction = 1; 3626 } 3627 } 3628 #endif 3629 3630 if (PrintCommandLineFlags) { 3631 CommandLineFlags::printSetFlags(tty); 3632 } 3633 3634 // Apply CPU specific policy for the BiasedLocking 3635 if (UseBiasedLocking) { 3636 if (!VM_Version::use_biased_locking() && 3637 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3638 UseBiasedLocking = false; 3639 } 3640 } 3641 3642 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3643 // but only if not already set on the commandline 3644 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3645 bool set = false; 3646 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3647 if (!set) { 3648 FLAG_SET_DEFAULT(PauseAtExit, true); 3649 } 3650 } 3651 3652 return JNI_OK; 3653 } 3654 3655 jint Arguments::adjust_after_os() { 3656 #if INCLUDE_ALL_GCS 3657 if (UseParallelGC || UseParallelOldGC) { 3658 if (UseNUMA) { 3659 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3660 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3661 } 3662 // For those collectors or operating systems (eg, Windows) that do 3663 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3664 UseNUMAInterleaving = true; 3665 } 3666 } 3667 #endif // INCLUDE_ALL_GCS 3668 return JNI_OK; 3669 } 3670 3671 int Arguments::PropertyList_count(SystemProperty* pl) { 3672 int count = 0; 3673 while(pl != NULL) { 3674 count++; 3675 pl = pl->next(); 3676 } 3677 return count; 3678 } 3679 3680 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3681 assert(key != NULL, "just checking"); 3682 SystemProperty* prop; 3683 for (prop = pl; prop != NULL; prop = prop->next()) { 3684 if (strcmp(key, prop->key()) == 0) return prop->value(); 3685 } 3686 return NULL; 3687 } 3688 3689 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3690 int count = 0; 3691 const char* ret_val = NULL; 3692 3693 while(pl != NULL) { 3694 if(count >= index) { 3695 ret_val = pl->key(); 3696 break; 3697 } 3698 count++; 3699 pl = pl->next(); 3700 } 3701 3702 return ret_val; 3703 } 3704 3705 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3706 int count = 0; 3707 char* ret_val = NULL; 3708 3709 while(pl != NULL) { 3710 if(count >= index) { 3711 ret_val = pl->value(); 3712 break; 3713 } 3714 count++; 3715 pl = pl->next(); 3716 } 3717 3718 return ret_val; 3719 } 3720 3721 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3722 SystemProperty* p = *plist; 3723 if (p == NULL) { 3724 *plist = new_p; 3725 } else { 3726 while (p->next() != NULL) { 3727 p = p->next(); 3728 } 3729 p->set_next(new_p); 3730 } 3731 } 3732 3733 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3734 if (plist == NULL) 3735 return; 3736 3737 SystemProperty* new_p = new SystemProperty(k, v, true); 3738 PropertyList_add(plist, new_p); 3739 } 3740 3741 // This add maintains unique property key in the list. 3742 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3743 if (plist == NULL) 3744 return; 3745 3746 // If property key exist then update with new value. 3747 SystemProperty* prop; 3748 for (prop = *plist; prop != NULL; prop = prop->next()) { 3749 if (strcmp(k, prop->key()) == 0) { 3750 if (append) { 3751 prop->append_value(v); 3752 } else { 3753 prop->set_value(v); 3754 } 3755 return; 3756 } 3757 } 3758 3759 PropertyList_add(plist, k, v); 3760 } 3761 3762 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3763 // Returns true if all of the source pointed by src has been copied over to 3764 // the destination buffer pointed by buf. Otherwise, returns false. 3765 // Notes: 3766 // 1. If the length (buflen) of the destination buffer excluding the 3767 // NULL terminator character is not long enough for holding the expanded 3768 // pid characters, it also returns false instead of returning the partially 3769 // expanded one. 3770 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3771 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3772 char* buf, size_t buflen) { 3773 const char* p = src; 3774 char* b = buf; 3775 const char* src_end = &src[srclen]; 3776 char* buf_end = &buf[buflen - 1]; 3777 3778 while (p < src_end && b < buf_end) { 3779 if (*p == '%') { 3780 switch (*(++p)) { 3781 case '%': // "%%" ==> "%" 3782 *b++ = *p++; 3783 break; 3784 case 'p': { // "%p" ==> current process id 3785 // buf_end points to the character before the last character so 3786 // that we could write '\0' to the end of the buffer. 3787 size_t buf_sz = buf_end - b + 1; 3788 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3789 3790 // if jio_snprintf fails or the buffer is not long enough to hold 3791 // the expanded pid, returns false. 3792 if (ret < 0 || ret >= (int)buf_sz) { 3793 return false; 3794 } else { 3795 b += ret; 3796 assert(*b == '\0', "fail in copy_expand_pid"); 3797 if (p == src_end && b == buf_end + 1) { 3798 // reach the end of the buffer. 3799 return true; 3800 } 3801 } 3802 p++; 3803 break; 3804 } 3805 default : 3806 *b++ = '%'; 3807 } 3808 } else { 3809 *b++ = *p++; 3810 } 3811 } 3812 *b = '\0'; 3813 return (p == src_end); // return false if not all of the source was copied 3814 }