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 // Disable options not supported in this release, with a warning if they 64 // were explicitly requested on the command-line 65 #define UNSUPPORTED_OPTION(opt, description) \ 66 do { \ 67 if (opt) { \ 68 if (FLAG_IS_CMDLINE(opt)) { \ 69 warning(description " is disabled in this release."); \ 70 } \ 71 FLAG_SET_DEFAULT(opt, false); \ 72 } \ 73 } while(0) 74 75 #define UNSUPPORTED_GC_OPTION(gc) \ 76 do { \ 77 if (gc) { \ 78 if (FLAG_IS_CMDLINE(gc)) { \ 79 warning(#gc " is not supported in this VM. Using Serial GC."); \ 80 } \ 81 FLAG_SET_DEFAULT(gc, false); \ 82 } \ 83 } while(0) 84 85 char** Arguments::_jvm_flags_array = NULL; 86 int Arguments::_num_jvm_flags = 0; 87 char** Arguments::_jvm_args_array = NULL; 88 int Arguments::_num_jvm_args = 0; 89 char* Arguments::_java_command = NULL; 90 SystemProperty* Arguments::_system_properties = NULL; 91 const char* Arguments::_gc_log_filename = NULL; 92 bool Arguments::_has_profile = false; 93 uintx Arguments::_min_heap_size = 0; 94 Arguments::Mode Arguments::_mode = _mixed; 95 bool Arguments::_java_compiler = false; 96 bool Arguments::_xdebug_mode = false; 97 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 99 int Arguments::_sun_java_launcher_pid = -1; 100 bool Arguments::_created_by_gamma_launcher = false; 101 102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 105 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 106 bool Arguments::_ClipInlining = ClipInlining; 107 108 char* Arguments::SharedArchivePath = NULL; 109 110 AgentLibraryList Arguments::_libraryList; 111 AgentLibraryList Arguments::_agentList; 112 113 abort_hook_t Arguments::_abort_hook = NULL; 114 exit_hook_t Arguments::_exit_hook = NULL; 115 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 116 117 118 SystemProperty *Arguments::_java_ext_dirs = NULL; 119 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 120 SystemProperty *Arguments::_sun_boot_library_path = NULL; 121 SystemProperty *Arguments::_java_library_path = NULL; 122 SystemProperty *Arguments::_java_home = NULL; 123 SystemProperty *Arguments::_java_class_path = NULL; 124 SystemProperty *Arguments::_sun_boot_class_path = NULL; 125 126 char* Arguments::_meta_index_path = NULL; 127 char* Arguments::_meta_index_dir = NULL; 128 129 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 130 131 static bool match_option(const JavaVMOption *option, const char* name, 132 const char** tail) { 133 int len = (int)strlen(name); 134 if (strncmp(option->optionString, name, len) == 0) { 135 *tail = option->optionString + len; 136 return true; 137 } else { 138 return false; 139 } 140 } 141 142 static void logOption(const char* opt) { 143 if (PrintVMOptions) { 144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 145 } 146 } 147 148 // Process java launcher properties. 149 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 150 // See if sun.java.launcher or sun.java.launcher.pid is defined. 151 // Must do this before setting up other system properties, 152 // as some of them may depend on launcher type. 153 for (int index = 0; index < args->nOptions; index++) { 154 const JavaVMOption* option = args->options + index; 155 const char* tail; 156 157 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 158 process_java_launcher_argument(tail, option->extraInfo); 159 continue; 160 } 161 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 162 _sun_java_launcher_pid = atoi(tail); 163 continue; 164 } 165 } 166 } 167 168 // Initialize system properties key and value. 169 void Arguments::init_system_properties() { 170 171 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 172 "Java Virtual Machine Specification", false)); 173 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 174 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 176 177 // following are JVMTI agent writeable properties. 178 // Properties values are set to NULL and they are 179 // os specific they are initialized in os::init_system_properties_values(). 180 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 181 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 182 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 183 _java_library_path = new SystemProperty("java.library.path", NULL, true); 184 _java_home = new SystemProperty("java.home", NULL, true); 185 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 186 187 _java_class_path = new SystemProperty("java.class.path", "", true); 188 189 // Add to System Property list. 190 PropertyList_add(&_system_properties, _java_ext_dirs); 191 PropertyList_add(&_system_properties, _java_endorsed_dirs); 192 PropertyList_add(&_system_properties, _sun_boot_library_path); 193 PropertyList_add(&_system_properties, _java_library_path); 194 PropertyList_add(&_system_properties, _java_home); 195 PropertyList_add(&_system_properties, _java_class_path); 196 PropertyList_add(&_system_properties, _sun_boot_class_path); 197 198 // Set OS specific system properties values 199 os::init_system_properties_values(); 200 } 201 202 203 // Update/Initialize System properties after JDK version number is known 204 void Arguments::init_version_specific_system_properties() { 205 enum { bufsz = 16 }; 206 char buffer[bufsz]; 207 const char* spec_vendor = "Sun Microsystems Inc."; 208 uint32_t spec_version = 0; 209 210 if (JDK_Version::is_gte_jdk17x_version()) { 211 spec_vendor = "Oracle Corporation"; 212 spec_version = JDK_Version::current().major_version(); 213 } 214 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 215 216 PropertyList_add(&_system_properties, 217 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 218 PropertyList_add(&_system_properties, 219 new SystemProperty("java.vm.specification.version", buffer, false)); 220 PropertyList_add(&_system_properties, 221 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 222 } 223 224 /** 225 * Provide a slightly more user-friendly way of eliminating -XX flags. 226 * When a flag is eliminated, it can be added to this list in order to 227 * continue accepting this flag on the command-line, while issuing a warning 228 * and ignoring the value. Once the JDK version reaches the 'accept_until' 229 * limit, we flatly refuse to admit the existence of the flag. This allows 230 * a flag to die correctly over JDK releases using HSX. 231 */ 232 typedef struct { 233 const char* name; 234 JDK_Version obsoleted_in; // when the flag went away 235 JDK_Version accept_until; // which version to start denying the existence 236 } ObsoleteFlag; 237 238 static ObsoleteFlag obsolete_jvm_flags[] = { 239 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 240 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 241 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 242 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 243 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 244 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 245 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 246 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 253 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 254 { "DefaultInitialRAMFraction", 255 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 256 { "UseDepthFirstScavengeOrder", 257 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 258 { "HandlePromotionFailure", 259 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 260 { "MaxLiveObjectEvacuationRatio", 261 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 262 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 263 { "UseParallelOldGCCompacting", 264 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 265 { "UseParallelDensePrefixUpdate", 266 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 267 { "UseParallelOldGCDensePrefix", 268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 269 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 270 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 271 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 272 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 273 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 274 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 275 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 276 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 277 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 278 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 #ifdef PRODUCT 290 { "DesiredMethodLimit", 291 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 292 #endif // PRODUCT 293 { NULL, JDK_Version(0), JDK_Version(0) } 294 }; 295 296 // Returns true if the flag is obsolete and fits into the range specified 297 // for being ignored. In the case that the flag is ignored, the 'version' 298 // value is filled in with the version number when the flag became 299 // obsolete so that that value can be displayed to the user. 300 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 301 int i = 0; 302 assert(version != NULL, "Must provide a version buffer"); 303 while (obsolete_jvm_flags[i].name != NULL) { 304 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 305 // <flag>=xxx form 306 // [-|+]<flag> form 307 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 308 ((s[0] == '+' || s[0] == '-') && 309 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 310 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 311 *version = flag_status.obsoleted_in; 312 return true; 313 } 314 } 315 i++; 316 } 317 return false; 318 } 319 320 // Constructs the system class path (aka boot class path) from the following 321 // components, in order: 322 // 323 // prefix // from -Xbootclasspath/p:... 324 // endorsed // the expansion of -Djava.endorsed.dirs=... 325 // base // from os::get_system_properties() or -Xbootclasspath= 326 // suffix // from -Xbootclasspath/a:... 327 // 328 // java.endorsed.dirs is a list of directories; any jar or zip files in the 329 // directories are added to the sysclasspath just before the base. 330 // 331 // This could be AllStatic, but it isn't needed after argument processing is 332 // complete. 333 class SysClassPath: public StackObj { 334 public: 335 SysClassPath(const char* base); 336 ~SysClassPath(); 337 338 inline void set_base(const char* base); 339 inline void add_prefix(const char* prefix); 340 inline void add_suffix_to_prefix(const char* suffix); 341 inline void add_suffix(const char* suffix); 342 inline void reset_path(const char* base); 343 344 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 345 // property. Must be called after all command-line arguments have been 346 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 347 // combined_path(). 348 void expand_endorsed(); 349 350 inline const char* get_base() const { return _items[_scp_base]; } 351 inline const char* get_prefix() const { return _items[_scp_prefix]; } 352 inline const char* get_suffix() const { return _items[_scp_suffix]; } 353 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 354 355 // Combine all the components into a single c-heap-allocated string; caller 356 // must free the string if/when no longer needed. 357 char* combined_path(); 358 359 private: 360 // Utility routines. 361 static char* add_to_path(const char* path, const char* str, bool prepend); 362 static char* add_jars_to_path(char* path, const char* directory); 363 364 inline void reset_item_at(int index); 365 366 // Array indices for the items that make up the sysclasspath. All except the 367 // base are allocated in the C heap and freed by this class. 368 enum { 369 _scp_prefix, // from -Xbootclasspath/p:... 370 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 371 _scp_base, // the default sysclasspath 372 _scp_suffix, // from -Xbootclasspath/a:... 373 _scp_nitems // the number of items, must be last. 374 }; 375 376 const char* _items[_scp_nitems]; 377 DEBUG_ONLY(bool _expansion_done;) 378 }; 379 380 SysClassPath::SysClassPath(const char* base) { 381 memset(_items, 0, sizeof(_items)); 382 _items[_scp_base] = base; 383 DEBUG_ONLY(_expansion_done = false;) 384 } 385 386 SysClassPath::~SysClassPath() { 387 // Free everything except the base. 388 for (int i = 0; i < _scp_nitems; ++i) { 389 if (i != _scp_base) reset_item_at(i); 390 } 391 DEBUG_ONLY(_expansion_done = false;) 392 } 393 394 inline void SysClassPath::set_base(const char* base) { 395 _items[_scp_base] = base; 396 } 397 398 inline void SysClassPath::add_prefix(const char* prefix) { 399 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 400 } 401 402 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 403 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 404 } 405 406 inline void SysClassPath::add_suffix(const char* suffix) { 407 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 408 } 409 410 inline void SysClassPath::reset_item_at(int index) { 411 assert(index < _scp_nitems && index != _scp_base, "just checking"); 412 if (_items[index] != NULL) { 413 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 414 _items[index] = NULL; 415 } 416 } 417 418 inline void SysClassPath::reset_path(const char* base) { 419 // Clear the prefix and suffix. 420 reset_item_at(_scp_prefix); 421 reset_item_at(_scp_suffix); 422 set_base(base); 423 } 424 425 //------------------------------------------------------------------------------ 426 427 void SysClassPath::expand_endorsed() { 428 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 429 430 const char* path = Arguments::get_property("java.endorsed.dirs"); 431 if (path == NULL) { 432 path = Arguments::get_endorsed_dir(); 433 assert(path != NULL, "no default for java.endorsed.dirs"); 434 } 435 436 char* expanded_path = NULL; 437 const char separator = *os::path_separator(); 438 const char* const end = path + strlen(path); 439 while (path < end) { 440 const char* tmp_end = strchr(path, separator); 441 if (tmp_end == NULL) { 442 expanded_path = add_jars_to_path(expanded_path, path); 443 path = end; 444 } else { 445 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 446 memcpy(dirpath, path, tmp_end - path); 447 dirpath[tmp_end - path] = '\0'; 448 expanded_path = add_jars_to_path(expanded_path, dirpath); 449 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 450 path = tmp_end + 1; 451 } 452 } 453 _items[_scp_endorsed] = expanded_path; 454 DEBUG_ONLY(_expansion_done = true;) 455 } 456 457 // Combine the bootclasspath elements, some of which may be null, into a single 458 // c-heap-allocated string. 459 char* SysClassPath::combined_path() { 460 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 461 assert(_expansion_done, "must call expand_endorsed() first."); 462 463 size_t lengths[_scp_nitems]; 464 size_t total_len = 0; 465 466 const char separator = *os::path_separator(); 467 468 // Get the lengths. 469 int i; 470 for (i = 0; i < _scp_nitems; ++i) { 471 if (_items[i] != NULL) { 472 lengths[i] = strlen(_items[i]); 473 // Include space for the separator char (or a NULL for the last item). 474 total_len += lengths[i] + 1; 475 } 476 } 477 assert(total_len > 0, "empty sysclasspath not allowed"); 478 479 // Copy the _items to a single string. 480 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 481 char* cp_tmp = cp; 482 for (i = 0; i < _scp_nitems; ++i) { 483 if (_items[i] != NULL) { 484 memcpy(cp_tmp, _items[i], lengths[i]); 485 cp_tmp += lengths[i]; 486 *cp_tmp++ = separator; 487 } 488 } 489 *--cp_tmp = '\0'; // Replace the extra separator. 490 return cp; 491 } 492 493 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 494 char* 495 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 496 char *cp; 497 498 assert(str != NULL, "just checking"); 499 if (path == NULL) { 500 size_t len = strlen(str) + 1; 501 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 502 memcpy(cp, str, len); // copy the trailing null 503 } else { 504 const char separator = *os::path_separator(); 505 size_t old_len = strlen(path); 506 size_t str_len = strlen(str); 507 size_t len = old_len + str_len + 2; 508 509 if (prepend) { 510 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 511 char* cp_tmp = cp; 512 memcpy(cp_tmp, str, str_len); 513 cp_tmp += str_len; 514 *cp_tmp = separator; 515 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 516 FREE_C_HEAP_ARRAY(char, path, mtInternal); 517 } else { 518 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 519 char* cp_tmp = cp + old_len; 520 *cp_tmp = separator; 521 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 522 } 523 } 524 return cp; 525 } 526 527 // Scan the directory and append any jar or zip files found to path. 528 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 529 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 530 DIR* dir = os::opendir(directory); 531 if (dir == NULL) return path; 532 533 char dir_sep[2] = { '\0', '\0' }; 534 size_t directory_len = strlen(directory); 535 const char fileSep = *os::file_separator(); 536 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 537 538 /* Scan the directory for jars/zips, appending them to path. */ 539 struct dirent *entry; 540 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 541 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 542 const char* name = entry->d_name; 543 const char* ext = name + strlen(name) - 4; 544 bool isJarOrZip = ext > name && 545 (os::file_name_strcmp(ext, ".jar") == 0 || 546 os::file_name_strcmp(ext, ".zip") == 0); 547 if (isJarOrZip) { 548 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 549 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 550 path = add_to_path(path, jarpath, false); 551 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 552 } 553 } 554 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 555 os::closedir(dir); 556 return path; 557 } 558 559 // Parses a memory size specification string. 560 static bool atomull(const char *s, julong* result) { 561 julong n = 0; 562 int args_read = sscanf(s, JULONG_FORMAT, &n); 563 if (args_read != 1) { 564 return false; 565 } 566 while (*s != '\0' && isdigit(*s)) { 567 s++; 568 } 569 // 4705540: illegal if more characters are found after the first non-digit 570 if (strlen(s) > 1) { 571 return false; 572 } 573 switch (*s) { 574 case 'T': case 't': 575 *result = n * G * K; 576 // Check for overflow. 577 if (*result/((julong)G * K) != n) return false; 578 return true; 579 case 'G': case 'g': 580 *result = n * G; 581 if (*result/G != n) return false; 582 return true; 583 case 'M': case 'm': 584 *result = n * M; 585 if (*result/M != n) return false; 586 return true; 587 case 'K': case 'k': 588 *result = n * K; 589 if (*result/K != n) return false; 590 return true; 591 case '\0': 592 *result = n; 593 return true; 594 default: 595 return false; 596 } 597 } 598 599 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 600 if (size < min_size) return arg_too_small; 601 // Check that size will fit in a size_t (only relevant on 32-bit) 602 if (size > max_uintx) return arg_too_big; 603 return arg_in_range; 604 } 605 606 // Describe an argument out of range error 607 void Arguments::describe_range_error(ArgsRange errcode) { 608 switch(errcode) { 609 case arg_too_big: 610 jio_fprintf(defaultStream::error_stream(), 611 "The specified size exceeds the maximum " 612 "representable size.\n"); 613 break; 614 case arg_too_small: 615 case arg_unreadable: 616 case arg_in_range: 617 // do nothing for now 618 break; 619 default: 620 ShouldNotReachHere(); 621 } 622 } 623 624 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 625 return CommandLineFlags::boolAtPut(name, &value, origin); 626 } 627 628 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 629 double v; 630 if (sscanf(value, "%lf", &v) != 1) { 631 return false; 632 } 633 634 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 635 return true; 636 } 637 return false; 638 } 639 640 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 641 julong v; 642 intx intx_v; 643 bool is_neg = false; 644 // Check the sign first since atomull() parses only unsigned values. 645 if (*value == '-') { 646 if (!CommandLineFlags::intxAt(name, &intx_v)) { 647 return false; 648 } 649 value++; 650 is_neg = true; 651 } 652 if (!atomull(value, &v)) { 653 return false; 654 } 655 intx_v = (intx) v; 656 if (is_neg) { 657 intx_v = -intx_v; 658 } 659 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 660 return true; 661 } 662 uintx uintx_v = (uintx) v; 663 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 664 return true; 665 } 666 uint64_t uint64_t_v = (uint64_t) v; 667 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 668 return true; 669 } 670 return false; 671 } 672 673 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 674 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 675 // Contract: CommandLineFlags always returns a pointer that needs freeing. 676 FREE_C_HEAP_ARRAY(char, value, mtInternal); 677 return true; 678 } 679 680 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 681 const char* old_value = ""; 682 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 683 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 684 size_t new_len = strlen(new_value); 685 const char* value; 686 char* free_this_too = NULL; 687 if (old_len == 0) { 688 value = new_value; 689 } else if (new_len == 0) { 690 value = old_value; 691 } else { 692 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 693 // each new setting adds another LINE to the switch: 694 sprintf(buf, "%s\n%s", old_value, new_value); 695 value = buf; 696 free_this_too = buf; 697 } 698 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 699 // CommandLineFlags always returns a pointer that needs freeing. 700 FREE_C_HEAP_ARRAY(char, value, mtInternal); 701 if (free_this_too != NULL) { 702 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 703 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 704 } 705 return true; 706 } 707 708 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 709 710 // range of acceptable characters spelled out for portability reasons 711 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 712 #define BUFLEN 255 713 char name[BUFLEN+1]; 714 char dummy; 715 716 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 717 return set_bool_flag(name, false, origin); 718 } 719 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 720 return set_bool_flag(name, true, origin); 721 } 722 723 char punct; 724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 725 const char* value = strchr(arg, '=') + 1; 726 Flag* flag = Flag::find_flag(name, strlen(name)); 727 if (flag != NULL && flag->is_ccstr()) { 728 if (flag->ccstr_accumulates()) { 729 return append_to_string_flag(name, value, origin); 730 } else { 731 if (value[0] == '\0') { 732 value = NULL; 733 } 734 return set_string_flag(name, value, origin); 735 } 736 } 737 } 738 739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 740 const char* value = strchr(arg, '=') + 1; 741 // -XX:Foo:=xxx will reset the string flag to the given value. 742 if (value[0] == '\0') { 743 value = NULL; 744 } 745 return set_string_flag(name, value, origin); 746 } 747 748 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 749 #define SIGNED_NUMBER_RANGE "[-0123456789]" 750 #define NUMBER_RANGE "[0123456789]" 751 char value[BUFLEN + 1]; 752 char value2[BUFLEN + 1]; 753 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 754 // Looks like a floating-point number -- try again with more lenient format string 755 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 756 return set_fp_numeric_flag(name, value, origin); 757 } 758 } 759 760 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 762 return set_numeric_flag(name, value, origin); 763 } 764 765 return false; 766 } 767 768 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 769 assert(bldarray != NULL, "illegal argument"); 770 771 if (arg == NULL) { 772 return; 773 } 774 775 int new_count = *count + 1; 776 777 // expand the array and add arg to the last element 778 if (*bldarray == NULL) { 779 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 780 } else { 781 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 782 } 783 (*bldarray)[*count] = strdup(arg); 784 *count = new_count; 785 } 786 787 void Arguments::build_jvm_args(const char* arg) { 788 add_string(&_jvm_args_array, &_num_jvm_args, arg); 789 } 790 791 void Arguments::build_jvm_flags(const char* arg) { 792 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 793 } 794 795 // utility function to return a string that concatenates all 796 // strings in a given char** array 797 const char* Arguments::build_resource_string(char** args, int count) { 798 if (args == NULL || count == 0) { 799 return NULL; 800 } 801 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 802 for (int i = 1; i < count; i++) { 803 length += strlen(args[i]) + 1; // add 1 for a space 804 } 805 char* s = NEW_RESOURCE_ARRAY(char, length); 806 strcpy(s, args[0]); 807 for (int j = 1; j < count; j++) { 808 strcat(s, " "); 809 strcat(s, args[j]); 810 } 811 return (const char*) s; 812 } 813 814 void Arguments::print_on(outputStream* st) { 815 st->print_cr("VM Arguments:"); 816 if (num_jvm_flags() > 0) { 817 st->print("jvm_flags: "); print_jvm_flags_on(st); 818 } 819 if (num_jvm_args() > 0) { 820 st->print("jvm_args: "); print_jvm_args_on(st); 821 } 822 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 823 if (_java_class_path != NULL) { 824 char* path = _java_class_path->value(); 825 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 826 } 827 st->print_cr("Launcher Type: %s", _sun_java_launcher); 828 } 829 830 void Arguments::print_jvm_flags_on(outputStream* st) { 831 if (_num_jvm_flags > 0) { 832 for (int i=0; i < _num_jvm_flags; i++) { 833 st->print("%s ", _jvm_flags_array[i]); 834 } 835 st->print_cr(""); 836 } 837 } 838 839 void Arguments::print_jvm_args_on(outputStream* st) { 840 if (_num_jvm_args > 0) { 841 for (int i=0; i < _num_jvm_args; i++) { 842 st->print("%s ", _jvm_args_array[i]); 843 } 844 st->print_cr(""); 845 } 846 } 847 848 bool Arguments::process_argument(const char* arg, 849 jboolean ignore_unrecognized, FlagValueOrigin origin) { 850 851 JDK_Version since = JDK_Version(); 852 853 if (parse_argument(arg, origin) || ignore_unrecognized) { 854 return true; 855 } 856 857 bool has_plus_minus = (*arg == '+' || *arg == '-'); 858 const char* const argname = has_plus_minus ? arg + 1 : arg; 859 if (is_newly_obsolete(arg, &since)) { 860 char version[256]; 861 since.to_string(version, sizeof(version)); 862 warning("ignoring option %s; support was removed in %s", argname, version); 863 return true; 864 } 865 866 // For locked flags, report a custom error message if available. 867 // Otherwise, report the standard unrecognized VM option. 868 869 size_t arg_len; 870 const char* equal_sign = strchr(argname, '='); 871 if (equal_sign == NULL) { 872 arg_len = strlen(argname); 873 } else { 874 arg_len = equal_sign - argname; 875 } 876 877 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true); 878 if (found_flag != NULL) { 879 char locked_message_buf[BUFLEN]; 880 found_flag->get_locked_message(locked_message_buf, BUFLEN); 881 if (strlen(locked_message_buf) == 0) { 882 if (found_flag->is_bool() && !has_plus_minus) { 883 jio_fprintf(defaultStream::error_stream(), 884 "Missing +/- setting for VM option '%s'\n", argname); 885 } else if (!found_flag->is_bool() && has_plus_minus) { 886 jio_fprintf(defaultStream::error_stream(), 887 "Unexpected +/- setting in VM option '%s'\n", argname); 888 } else { 889 jio_fprintf(defaultStream::error_stream(), 890 "Improperly specified VM option '%s'\n", argname); 891 } 892 } else { 893 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 894 } 895 } else { 896 jio_fprintf(defaultStream::error_stream(), 897 "Unrecognized VM option '%s'\n", argname); 898 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 899 if (fuzzy_matched != NULL) { 900 jio_fprintf(defaultStream::error_stream(), 901 "Did you mean '%s%s%s'?\n", 902 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 903 fuzzy_matched->name, 904 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 905 } 906 } 907 908 // allow for commandline "commenting out" options like -XX:#+Verbose 909 return arg[0] == '#'; 910 } 911 912 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 913 FILE* stream = fopen(file_name, "rb"); 914 if (stream == NULL) { 915 if (should_exist) { 916 jio_fprintf(defaultStream::error_stream(), 917 "Could not open settings file %s\n", file_name); 918 return false; 919 } else { 920 return true; 921 } 922 } 923 924 char token[1024]; 925 int pos = 0; 926 927 bool in_white_space = true; 928 bool in_comment = false; 929 bool in_quote = false; 930 char quote_c = 0; 931 bool result = true; 932 933 int c = getc(stream); 934 while(c != EOF && pos < (int)(sizeof(token)-1)) { 935 if (in_white_space) { 936 if (in_comment) { 937 if (c == '\n') in_comment = false; 938 } else { 939 if (c == '#') in_comment = true; 940 else if (!isspace(c)) { 941 in_white_space = false; 942 token[pos++] = c; 943 } 944 } 945 } else { 946 if (c == '\n' || (!in_quote && isspace(c))) { 947 // token ends at newline, or at unquoted whitespace 948 // this allows a way to include spaces in string-valued options 949 token[pos] = '\0'; 950 logOption(token); 951 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 952 build_jvm_flags(token); 953 pos = 0; 954 in_white_space = true; 955 in_quote = false; 956 } else if (!in_quote && (c == '\'' || c == '"')) { 957 in_quote = true; 958 quote_c = c; 959 } else if (in_quote && (c == quote_c)) { 960 in_quote = false; 961 } else { 962 token[pos++] = c; 963 } 964 } 965 c = getc(stream); 966 } 967 if (pos > 0) { 968 token[pos] = '\0'; 969 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 970 build_jvm_flags(token); 971 } 972 fclose(stream); 973 return result; 974 } 975 976 //============================================================================================================= 977 // Parsing of properties (-D) 978 979 const char* Arguments::get_property(const char* key) { 980 return PropertyList_get_value(system_properties(), key); 981 } 982 983 bool Arguments::add_property(const char* prop) { 984 const char* eq = strchr(prop, '='); 985 char* key; 986 // ns must be static--its address may be stored in a SystemProperty object. 987 const static char ns[1] = {0}; 988 char* value = (char *)ns; 989 990 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 991 key = AllocateHeap(key_len + 1, mtInternal); 992 strncpy(key, prop, key_len); 993 key[key_len] = '\0'; 994 995 if (eq != NULL) { 996 size_t value_len = strlen(prop) - key_len - 1; 997 value = AllocateHeap(value_len + 1, mtInternal); 998 strncpy(value, &prop[key_len + 1], value_len + 1); 999 } 1000 1001 if (strcmp(key, "java.compiler") == 0) { 1002 process_java_compiler_argument(value); 1003 FreeHeap(key); 1004 if (eq != NULL) { 1005 FreeHeap(value); 1006 } 1007 return true; 1008 } else if (strcmp(key, "sun.java.command") == 0) { 1009 _java_command = value; 1010 1011 // Record value in Arguments, but let it get passed to Java. 1012 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 1013 // launcher.pid property is private and is processed 1014 // in process_sun_java_launcher_properties(); 1015 // the sun.java.launcher property is passed on to the java application 1016 FreeHeap(key); 1017 if (eq != NULL) { 1018 FreeHeap(value); 1019 } 1020 return true; 1021 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1022 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1023 // its value without going through the property list or making a Java call. 1024 _java_vendor_url_bug = value; 1025 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1026 PropertyList_unique_add(&_system_properties, key, value, true); 1027 return true; 1028 } 1029 // Create new property and add at the end of the list 1030 PropertyList_unique_add(&_system_properties, key, value); 1031 return true; 1032 } 1033 1034 //=========================================================================================================== 1035 // Setting int/mixed/comp mode flags 1036 1037 void Arguments::set_mode_flags(Mode mode) { 1038 // Set up default values for all flags. 1039 // If you add a flag to any of the branches below, 1040 // add a default value for it here. 1041 set_java_compiler(false); 1042 _mode = mode; 1043 1044 // Ensure Agent_OnLoad has the correct initial values. 1045 // This may not be the final mode; mode may change later in onload phase. 1046 PropertyList_unique_add(&_system_properties, "java.vm.info", 1047 (char*)VM_Version::vm_info_string(), false); 1048 1049 UseInterpreter = true; 1050 UseCompiler = true; 1051 UseLoopCounter = true; 1052 1053 #ifndef ZERO 1054 // Turn these off for mixed and comp. Leave them on for Zero. 1055 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1056 UseFastAccessorMethods = (mode == _int); 1057 } 1058 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1059 UseFastEmptyMethods = (mode == _int); 1060 } 1061 #endif 1062 1063 // Default values may be platform/compiler dependent - 1064 // use the saved values 1065 ClipInlining = Arguments::_ClipInlining; 1066 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1067 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1068 BackgroundCompilation = Arguments::_BackgroundCompilation; 1069 1070 // Change from defaults based on mode 1071 switch (mode) { 1072 default: 1073 ShouldNotReachHere(); 1074 break; 1075 case _int: 1076 UseCompiler = false; 1077 UseLoopCounter = false; 1078 AlwaysCompileLoopMethods = false; 1079 UseOnStackReplacement = false; 1080 break; 1081 case _mixed: 1082 // same as default 1083 break; 1084 case _comp: 1085 UseInterpreter = false; 1086 BackgroundCompilation = false; 1087 ClipInlining = false; 1088 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1089 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1090 // compile a level 4 (C2) and then continue executing it. 1091 if (TieredCompilation) { 1092 Tier3InvokeNotifyFreqLog = 0; 1093 Tier4InvocationThreshold = 0; 1094 } 1095 break; 1096 } 1097 } 1098 1099 // Conflict: required to use shared spaces (-Xshare:on), but 1100 // incompatible command line options were chosen. 1101 1102 static void no_shared_spaces() { 1103 if (RequireSharedSpaces) { 1104 jio_fprintf(defaultStream::error_stream(), 1105 "Class data sharing is inconsistent with other specified options.\n"); 1106 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1107 } else { 1108 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1109 } 1110 } 1111 1112 void Arguments::set_tiered_flags() { 1113 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1114 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1115 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1116 } 1117 if (CompilationPolicyChoice < 2) { 1118 vm_exit_during_initialization( 1119 "Incompatible compilation policy selected", NULL); 1120 } 1121 // Increase the code cache size - tiered compiles a lot more. 1122 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1123 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1124 } 1125 if (!UseInterpreter) { // -Xcomp 1126 Tier3InvokeNotifyFreqLog = 0; 1127 Tier4InvocationThreshold = 0; 1128 } 1129 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 1130 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 1131 } 1132 } 1133 1134 #if INCLUDE_ALL_GCS 1135 static void disable_adaptive_size_policy(const char* collector_name) { 1136 if (UseAdaptiveSizePolicy) { 1137 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1138 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1139 collector_name); 1140 } 1141 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1142 } 1143 } 1144 1145 void Arguments::set_parnew_gc_flags() { 1146 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1147 "control point invariant"); 1148 assert(UseParNewGC, "Error"); 1149 1150 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1151 disable_adaptive_size_policy("UseParNewGC"); 1152 1153 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1154 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1155 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1156 } else if (ParallelGCThreads == 0) { 1157 jio_fprintf(defaultStream::error_stream(), 1158 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1159 vm_exit(1); 1160 } 1161 1162 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1163 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1164 // we set them to 1024 and 1024. 1165 // See CR 6362902. 1166 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1167 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1168 } 1169 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1170 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1171 } 1172 1173 // AlwaysTenure flag should make ParNew promote all at first collection. 1174 // See CR 6362902. 1175 if (AlwaysTenure) { 1176 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1177 } 1178 // When using compressed oops, we use local overflow stacks, 1179 // rather than using a global overflow list chained through 1180 // the klass word of the object's pre-image. 1181 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1182 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1183 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1184 } 1185 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1186 } 1187 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1188 } 1189 1190 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1191 // sparc/solaris for certain applications, but would gain from 1192 // further optimization and tuning efforts, and would almost 1193 // certainly gain from analysis of platform and environment. 1194 void Arguments::set_cms_and_parnew_gc_flags() { 1195 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1196 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1197 1198 // If we are using CMS, we prefer to UseParNewGC, 1199 // unless explicitly forbidden. 1200 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1201 FLAG_SET_ERGO(bool, UseParNewGC, true); 1202 } 1203 1204 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1205 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1206 1207 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1208 // as needed. 1209 if (UseParNewGC) { 1210 set_parnew_gc_flags(); 1211 } 1212 1213 size_t max_heap = align_size_down(MaxHeapSize, 1214 CardTableRS::ct_max_alignment_constraint()); 1215 1216 // Now make adjustments for CMS 1217 intx tenuring_default = (intx)6; 1218 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1219 1220 // Preferred young gen size for "short" pauses: 1221 // upper bound depends on # of threads and NewRatio. 1222 const uintx parallel_gc_threads = 1223 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1224 const size_t preferred_max_new_size_unaligned = 1225 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1226 size_t preferred_max_new_size = 1227 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1228 1229 // Unless explicitly requested otherwise, size young gen 1230 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1231 1232 // If either MaxNewSize or NewRatio is set on the command line, 1233 // assume the user is trying to set the size of the young gen. 1234 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1235 1236 // Set MaxNewSize to our calculated preferred_max_new_size unless 1237 // NewSize was set on the command line and it is larger than 1238 // preferred_max_new_size. 1239 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1240 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1241 } else { 1242 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1243 } 1244 if (PrintGCDetails && Verbose) { 1245 // Too early to use gclog_or_tty 1246 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1247 } 1248 1249 // Code along this path potentially sets NewSize and OldSize 1250 if (PrintGCDetails && Verbose) { 1251 // Too early to use gclog_or_tty 1252 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1253 " initial_heap_size: " SIZE_FORMAT 1254 " max_heap: " SIZE_FORMAT, 1255 min_heap_size(), InitialHeapSize, max_heap); 1256 } 1257 size_t min_new = preferred_max_new_size; 1258 if (FLAG_IS_CMDLINE(NewSize)) { 1259 min_new = NewSize; 1260 } 1261 if (max_heap > min_new && min_heap_size() > min_new) { 1262 // Unless explicitly requested otherwise, make young gen 1263 // at least min_new, and at most preferred_max_new_size. 1264 if (FLAG_IS_DEFAULT(NewSize)) { 1265 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1266 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1267 if (PrintGCDetails && Verbose) { 1268 // Too early to use gclog_or_tty 1269 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1270 } 1271 } 1272 // Unless explicitly requested otherwise, size old gen 1273 // so it's NewRatio x of NewSize. 1274 if (FLAG_IS_DEFAULT(OldSize)) { 1275 if (max_heap > NewSize) { 1276 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1277 if (PrintGCDetails && Verbose) { 1278 // Too early to use gclog_or_tty 1279 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1280 } 1281 } 1282 } 1283 } 1284 } 1285 // Unless explicitly requested otherwise, definitely 1286 // promote all objects surviving "tenuring_default" scavenges. 1287 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1288 FLAG_IS_DEFAULT(SurvivorRatio)) { 1289 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1290 } 1291 // If we decided above (or user explicitly requested) 1292 // `promote all' (via MaxTenuringThreshold := 0), 1293 // prefer minuscule survivor spaces so as not to waste 1294 // space for (non-existent) survivors 1295 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1296 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1297 } 1298 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1299 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1300 // This is done in order to make ParNew+CMS configuration to work 1301 // with YoungPLABSize and OldPLABSize options. 1302 // See CR 6362902. 1303 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1304 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1305 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1306 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1307 // the value (either from the command line or ergonomics) of 1308 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1309 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1310 } else { 1311 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1312 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1313 // we'll let it to take precedence. 1314 jio_fprintf(defaultStream::error_stream(), 1315 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1316 " options are specified for the CMS collector." 1317 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1318 } 1319 } 1320 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1321 // OldPLAB sizing manually turned off: Use a larger default setting, 1322 // unless it was manually specified. This is because a too-low value 1323 // will slow down scavenges. 1324 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1325 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1326 } 1327 } 1328 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1329 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1330 // If either of the static initialization defaults have changed, note this 1331 // modification. 1332 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1333 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1334 } 1335 if (PrintGCDetails && Verbose) { 1336 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1337 MarkStackSize / K, MarkStackSizeMax / K); 1338 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1339 } 1340 } 1341 #endif // INCLUDE_ALL_GCS 1342 1343 void set_object_alignment() { 1344 // Object alignment. 1345 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1346 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1347 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1348 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1349 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1350 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1351 1352 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1353 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1354 1355 // Oop encoding heap max 1356 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1357 1358 #if INCLUDE_ALL_GCS 1359 // Set CMS global values 1360 CompactibleFreeListSpace::set_cms_values(); 1361 #endif // INCLUDE_ALL_GCS 1362 } 1363 1364 bool verify_object_alignment() { 1365 // Object alignment. 1366 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1367 jio_fprintf(defaultStream::error_stream(), 1368 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1369 (int)ObjectAlignmentInBytes); 1370 return false; 1371 } 1372 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1373 jio_fprintf(defaultStream::error_stream(), 1374 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1375 (int)ObjectAlignmentInBytes, BytesPerLong); 1376 return false; 1377 } 1378 // It does not make sense to have big object alignment 1379 // since a space lost due to alignment will be greater 1380 // then a saved space from compressed oops. 1381 if ((int)ObjectAlignmentInBytes > 256) { 1382 jio_fprintf(defaultStream::error_stream(), 1383 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1384 (int)ObjectAlignmentInBytes); 1385 return false; 1386 } 1387 // In case page size is very small. 1388 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1389 jio_fprintf(defaultStream::error_stream(), 1390 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1391 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1392 return false; 1393 } 1394 return true; 1395 } 1396 1397 inline uintx max_heap_for_compressed_oops() { 1398 // Avoid sign flip. 1399 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1400 LP64_ONLY(return OopEncodingHeapMax - os::vm_page_size()); 1401 NOT_LP64(ShouldNotReachHere(); return 0); 1402 } 1403 1404 bool Arguments::should_auto_select_low_pause_collector() { 1405 if (UseAutoGCSelectPolicy && 1406 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1407 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1408 if (PrintGCDetails) { 1409 // Cannot use gclog_or_tty yet. 1410 tty->print_cr("Automatic selection of the low pause collector" 1411 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1412 } 1413 return true; 1414 } 1415 return false; 1416 } 1417 1418 void Arguments::set_use_compressed_oops() { 1419 #ifndef ZERO 1420 #ifdef _LP64 1421 // MaxHeapSize is not set up properly at this point, but 1422 // the only value that can override MaxHeapSize if we are 1423 // to use UseCompressedOops is InitialHeapSize. 1424 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1425 1426 if (max_heap_size <= max_heap_for_compressed_oops()) { 1427 #if !defined(COMPILER1) || defined(TIERED) 1428 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1429 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1430 } 1431 #endif 1432 #ifdef _WIN64 1433 if (UseLargePages && UseCompressedOops) { 1434 // Cannot allocate guard pages for implicit checks in indexed addressing 1435 // mode, when large pages are specified on windows. 1436 // This flag could be switched ON if narrow oop base address is set to 0, 1437 // see code in Universe::initialize_heap(). 1438 Universe::set_narrow_oop_use_implicit_null_checks(false); 1439 } 1440 #endif // _WIN64 1441 } else { 1442 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1443 warning("Max heap size too large for Compressed Oops"); 1444 FLAG_SET_DEFAULT(UseCompressedOops, false); 1445 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1446 } 1447 } 1448 #endif // _LP64 1449 #endif // ZERO 1450 } 1451 1452 1453 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1454 // set_use_compressed_oops(). 1455 void Arguments::set_use_compressed_klass_ptrs() { 1456 #ifndef ZERO 1457 #ifdef _LP64 1458 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1459 if (!UseCompressedOops) { 1460 if (UseCompressedKlassPointers) { 1461 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1462 } 1463 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1464 } else { 1465 // Turn on UseCompressedKlassPointers too 1466 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1467 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1468 } 1469 // Check the ClassMetaspaceSize to make sure we use compressed klass ptrs. 1470 if (UseCompressedKlassPointers) { 1471 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) { 1472 warning("Class metaspace size is too large for UseCompressedKlassPointers"); 1473 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1474 } 1475 } 1476 } 1477 #endif // _LP64 1478 #endif // !ZERO 1479 } 1480 1481 void Arguments::set_ergonomics_flags() { 1482 1483 if (os::is_server_class_machine()) { 1484 // If no other collector is requested explicitly, 1485 // let the VM select the collector based on 1486 // machine class and automatic selection policy. 1487 if (!UseSerialGC && 1488 !UseConcMarkSweepGC && 1489 !UseG1GC && 1490 !UseParNewGC && 1491 FLAG_IS_DEFAULT(UseParallelGC)) { 1492 if (should_auto_select_low_pause_collector()) { 1493 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1494 } else { 1495 FLAG_SET_ERGO(bool, UseParallelGC, true); 1496 } 1497 } 1498 // Shared spaces work fine with other GCs but causes bytecode rewriting 1499 // to be disabled, which hurts interpreter performance and decreases 1500 // server performance. On server class machines, keep the default 1501 // off unless it is asked for. Future work: either add bytecode rewriting 1502 // at link time, or rewrite bytecodes in non-shared methods. 1503 if (!DumpSharedSpaces && !RequireSharedSpaces && 1504 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1505 no_shared_spaces(); 1506 } 1507 } 1508 1509 #ifndef ZERO 1510 #ifdef _LP64 1511 set_use_compressed_oops(); 1512 1513 // set_use_compressed_klass_ptrs() must be called after calling 1514 // set_use_compressed_oops(). 1515 set_use_compressed_klass_ptrs(); 1516 1517 // Also checks that certain machines are slower with compressed oops 1518 // in vm_version initialization code. 1519 #endif // _LP64 1520 #endif // !ZERO 1521 } 1522 1523 void Arguments::set_parallel_gc_flags() { 1524 assert(UseParallelGC || UseParallelOldGC, "Error"); 1525 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1526 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1527 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1528 } 1529 FLAG_SET_DEFAULT(UseParallelGC, true); 1530 1531 // If no heap maximum was requested explicitly, use some reasonable fraction 1532 // of the physical memory, up to a maximum of 1GB. 1533 FLAG_SET_DEFAULT(ParallelGCThreads, 1534 Abstract_VM_Version::parallel_worker_threads()); 1535 if (ParallelGCThreads == 0) { 1536 jio_fprintf(defaultStream::error_stream(), 1537 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1538 vm_exit(1); 1539 } 1540 1541 1542 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1543 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1544 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1545 // See CR 6362902 for details. 1546 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1547 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1548 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1549 } 1550 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1551 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1552 } 1553 } 1554 1555 if (UseParallelOldGC) { 1556 // Par compact uses lower default values since they are treated as 1557 // minimums. These are different defaults because of the different 1558 // interpretation and are not ergonomically set. 1559 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1560 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1561 } 1562 } 1563 } 1564 1565 void Arguments::set_g1_gc_flags() { 1566 assert(UseG1GC, "Error"); 1567 #ifdef COMPILER1 1568 FastTLABRefill = false; 1569 #endif 1570 FLAG_SET_DEFAULT(ParallelGCThreads, 1571 Abstract_VM_Version::parallel_worker_threads()); 1572 if (ParallelGCThreads == 0) { 1573 FLAG_SET_DEFAULT(ParallelGCThreads, 1574 Abstract_VM_Version::parallel_worker_threads()); 1575 } 1576 1577 // MarkStackSize will be set (if it hasn't been set by the user) 1578 // when concurrent marking is initialized. 1579 // Its value will be based upon the number of parallel marking threads. 1580 // But we do set the maximum mark stack size here. 1581 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1582 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1583 } 1584 1585 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1586 // In G1, we want the default GC overhead goal to be higher than 1587 // say in PS. So we set it here to 10%. Otherwise the heap might 1588 // be expanded more aggressively than we would like it to. In 1589 // fact, even 10% seems to not be high enough in some cases 1590 // (especially small GC stress tests that the main thing they do 1591 // is allocation). We might consider increase it further. 1592 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1593 } 1594 1595 if (PrintGCDetails && Verbose) { 1596 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1597 MarkStackSize / K, MarkStackSizeMax / K); 1598 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1599 } 1600 } 1601 1602 julong Arguments::limit_by_allocatable_memory(julong limit) { 1603 julong max_allocatable; 1604 julong result = limit; 1605 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1606 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1607 } 1608 return result; 1609 } 1610 1611 void Arguments::set_heap_base_min_address() { 1612 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) { 1613 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86. 1614 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1 1615 // some extra space for the C-heap compared to other collectors. 1616 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that 1617 // code that checks for default values work correctly. 1618 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G); 1619 } 1620 } 1621 1622 void Arguments::set_heap_size() { 1623 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1624 // Deprecated flag 1625 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1626 } 1627 1628 const julong phys_mem = 1629 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1630 : (julong)MaxRAM; 1631 1632 // If the maximum heap size has not been set with -Xmx, 1633 // then set it as fraction of the size of physical memory, 1634 // respecting the maximum and minimum sizes of the heap. 1635 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1636 julong reasonable_max = phys_mem / MaxRAMFraction; 1637 1638 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1639 // Small physical memory, so use a minimum fraction of it for the heap 1640 reasonable_max = phys_mem / MinRAMFraction; 1641 } else { 1642 // Not-small physical memory, so require a heap at least 1643 // as large as MaxHeapSize 1644 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1645 } 1646 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1647 // Limit the heap size to ErgoHeapSizeLimit 1648 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1649 } 1650 if (UseCompressedOops) { 1651 // Limit the heap size to the maximum possible when using compressed oops 1652 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1653 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1654 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1655 // but it should be not less than default MaxHeapSize. 1656 max_coop_heap -= HeapBaseMinAddress; 1657 } 1658 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1659 } 1660 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1661 1662 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1663 // An initial heap size was specified on the command line, 1664 // so be sure that the maximum size is consistent. Done 1665 // after call to limit_by_allocatable_memory because that 1666 // method might reduce the allocation size. 1667 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1668 } 1669 1670 if (PrintGCDetails && Verbose) { 1671 // Cannot use gclog_or_tty yet. 1672 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1673 } 1674 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1675 } 1676 1677 // If the minimum or initial heap_size have not been set or requested to be set 1678 // ergonomically, set them accordingly. 1679 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1680 julong reasonable_minimum = (julong)(OldSize + NewSize); 1681 1682 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1683 1684 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1685 1686 if (InitialHeapSize == 0) { 1687 julong reasonable_initial = phys_mem / InitialRAMFraction; 1688 1689 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1690 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1691 1692 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1693 1694 if (PrintGCDetails && Verbose) { 1695 // Cannot use gclog_or_tty yet. 1696 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1697 } 1698 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1699 } 1700 // If the minimum heap size has not been set (via -Xms), 1701 // synchronize with InitialHeapSize to avoid errors with the default value. 1702 if (min_heap_size() == 0) { 1703 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1704 if (PrintGCDetails && Verbose) { 1705 // Cannot use gclog_or_tty yet. 1706 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1707 } 1708 } 1709 } 1710 } 1711 1712 // This must be called after ergonomics because we want bytecode rewriting 1713 // if the server compiler is used, or if UseSharedSpaces is disabled. 1714 void Arguments::set_bytecode_flags() { 1715 // Better not attempt to store into a read-only space. 1716 if (UseSharedSpaces) { 1717 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1718 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1719 } 1720 1721 if (!RewriteBytecodes) { 1722 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1723 } 1724 } 1725 1726 // Aggressive optimization flags -XX:+AggressiveOpts 1727 void Arguments::set_aggressive_opts_flags() { 1728 #ifdef COMPILER2 1729 if (AggressiveUnboxing) { 1730 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1731 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1732 } else if (!EliminateAutoBox) { 1733 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1734 AggressiveUnboxing = false; 1735 } 1736 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1737 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1738 } else if (!DoEscapeAnalysis) { 1739 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1740 AggressiveUnboxing = false; 1741 } 1742 } 1743 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1744 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1745 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1746 } 1747 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1748 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1749 } 1750 1751 // Feed the cache size setting into the JDK 1752 char buffer[1024]; 1753 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1754 add_property(buffer); 1755 } 1756 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1757 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1758 } 1759 #endif 1760 1761 if (AggressiveOpts) { 1762 // Sample flag setting code 1763 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1764 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1765 // } 1766 } 1767 } 1768 1769 //=========================================================================================================== 1770 // Parsing of java.compiler property 1771 1772 void Arguments::process_java_compiler_argument(char* arg) { 1773 // For backwards compatibility, Djava.compiler=NONE or "" 1774 // causes us to switch to -Xint mode UNLESS -Xdebug 1775 // is also specified. 1776 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1777 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1778 } 1779 } 1780 1781 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1782 _sun_java_launcher = strdup(launcher); 1783 if (strcmp("gamma", _sun_java_launcher) == 0) { 1784 _created_by_gamma_launcher = true; 1785 } 1786 } 1787 1788 bool Arguments::created_by_java_launcher() { 1789 assert(_sun_java_launcher != NULL, "property must have value"); 1790 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1791 } 1792 1793 bool Arguments::created_by_gamma_launcher() { 1794 return _created_by_gamma_launcher; 1795 } 1796 1797 //=========================================================================================================== 1798 // Parsing of main arguments 1799 1800 bool Arguments::verify_interval(uintx val, uintx min, 1801 uintx max, const char* name) { 1802 // Returns true iff value is in the inclusive interval [min..max] 1803 // false, otherwise. 1804 if (val >= min && val <= max) { 1805 return true; 1806 } 1807 jio_fprintf(defaultStream::error_stream(), 1808 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1809 " and " UINTX_FORMAT "\n", 1810 name, val, min, max); 1811 return false; 1812 } 1813 1814 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1815 // Returns true if given value is at least specified min threshold 1816 // false, otherwise. 1817 if (val >= min ) { 1818 return true; 1819 } 1820 jio_fprintf(defaultStream::error_stream(), 1821 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1822 name, val, min); 1823 return false; 1824 } 1825 1826 bool Arguments::verify_percentage(uintx value, const char* name) { 1827 if (value <= 100) { 1828 return true; 1829 } 1830 jio_fprintf(defaultStream::error_stream(), 1831 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1832 name, value); 1833 return false; 1834 } 1835 1836 #if !INCLUDE_ALL_GCS 1837 #ifdef ASSERT 1838 static bool verify_serial_gc_flags() { 1839 return (UseSerialGC && 1840 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1841 UseParallelGC || UseParallelOldGC)); 1842 } 1843 #endif // ASSERT 1844 #endif // INCLUDE_ALL_GCS 1845 1846 // check if do gclog rotation 1847 // +UseGCLogFileRotation is a must, 1848 // no gc log rotation when log file not supplied or 1849 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1850 void check_gclog_consistency() { 1851 if (UseGCLogFileRotation) { 1852 if ((Arguments::gc_log_filename() == NULL) || 1853 (NumberOfGCLogFiles == 0) || 1854 (GCLogFileSize == 0)) { 1855 jio_fprintf(defaultStream::output_stream(), 1856 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1857 "where num_of_file > 0 and num_of_size > 0\n" 1858 "GC log rotation is turned off\n"); 1859 UseGCLogFileRotation = false; 1860 } 1861 } 1862 1863 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1864 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1865 jio_fprintf(defaultStream::output_stream(), 1866 "GCLogFileSize changed to minimum 8K\n"); 1867 } 1868 } 1869 1870 // Check consistency of GC selection 1871 bool Arguments::check_gc_consistency() { 1872 check_gclog_consistency(); 1873 bool status = true; 1874 // Ensure that the user has not selected conflicting sets 1875 // of collectors. [Note: this check is merely a user convenience; 1876 // collectors over-ride each other so that only a non-conflicting 1877 // set is selected; however what the user gets is not what they 1878 // may have expected from the combination they asked for. It's 1879 // better to reduce user confusion by not allowing them to 1880 // select conflicting combinations. 1881 uint i = 0; 1882 if (UseSerialGC) i++; 1883 if (UseConcMarkSweepGC || UseParNewGC) i++; 1884 if (UseParallelGC || UseParallelOldGC) i++; 1885 if (UseG1GC) i++; 1886 if (i > 1) { 1887 jio_fprintf(defaultStream::error_stream(), 1888 "Conflicting collector combinations in option list; " 1889 "please refer to the release notes for the combinations " 1890 "allowed\n"); 1891 status = false; 1892 } else if (ReservedCodeCacheSize > 2*G) { 1893 // Code cache size larger than MAXINT is not supported. 1894 jio_fprintf(defaultStream::error_stream(), 1895 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 1896 (2*G)/M); 1897 status = false; 1898 } 1899 return status; 1900 } 1901 1902 void Arguments::check_deprecated_gcs() { 1903 if (UseConcMarkSweepGC && !UseParNewGC) { 1904 warning("Using the DefNew young collector with the CMS collector is deprecated " 1905 "and will likely be removed in a future release"); 1906 } 1907 1908 if (UseParNewGC && !UseConcMarkSweepGC) { 1909 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1910 // set up UseSerialGC properly, so that can't be used in the check here. 1911 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1912 "and will likely be removed in a future release"); 1913 } 1914 1915 if (CMSIncrementalMode) { 1916 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1917 } 1918 } 1919 1920 void Arguments::check_deprecated_gc_flags() { 1921 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1922 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1923 "and will likely be removed in future release"); 1924 } 1925 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 1926 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 1927 "Use MaxRAMFraction instead."); 1928 } 1929 } 1930 1931 // Check stack pages settings 1932 bool Arguments::check_stack_pages() 1933 { 1934 bool status = true; 1935 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1936 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1937 // greater stack shadow pages can't generate instruction to bang stack 1938 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1939 return status; 1940 } 1941 1942 // Check the consistency of vm_init_args 1943 bool Arguments::check_vm_args_consistency() { 1944 // Method for adding checks for flag consistency. 1945 // The intent is to warn the user of all possible conflicts, 1946 // before returning an error. 1947 // Note: Needs platform-dependent factoring. 1948 bool status = true; 1949 1950 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1951 // builds so the cost of stack banging can be measured. 1952 #if (defined(PRODUCT) && defined(SOLARIS)) 1953 if (!UseBoundThreads && !UseStackBanging) { 1954 jio_fprintf(defaultStream::error_stream(), 1955 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1956 1957 status = false; 1958 } 1959 #endif 1960 1961 if (TLABRefillWasteFraction == 0) { 1962 jio_fprintf(defaultStream::error_stream(), 1963 "TLABRefillWasteFraction should be a denominator, " 1964 "not " SIZE_FORMAT "\n", 1965 TLABRefillWasteFraction); 1966 status = false; 1967 } 1968 1969 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 1970 "AdaptiveSizePolicyWeight"); 1971 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1972 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1973 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1974 1975 // Divide by bucket size to prevent a large size from causing rollover when 1976 // calculating amount of memory needed to be allocated for the String table. 1977 status = status && verify_interval(StringTableSize, minimumStringTableSize, 1978 (max_uintx / StringTable::bucket_size()), "StringTable size"); 1979 1980 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1981 jio_fprintf(defaultStream::error_stream(), 1982 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1983 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1984 MinHeapFreeRatio, MaxHeapFreeRatio); 1985 status = false; 1986 } 1987 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1988 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1989 1990 // Min/MaxMetaspaceFreeRatio 1991 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 1992 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 1993 1994 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 1995 jio_fprintf(defaultStream::error_stream(), 1996 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 1997 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 1998 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 1999 MinMetaspaceFreeRatio, 2000 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2001 MaxMetaspaceFreeRatio); 2002 status = false; 2003 } 2004 2005 // Trying to keep 100% free is not practical 2006 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2007 2008 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2009 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2010 } 2011 2012 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2013 // Settings to encourage splitting. 2014 if (!FLAG_IS_CMDLINE(NewRatio)) { 2015 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2016 } 2017 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2018 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2019 } 2020 } 2021 2022 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2023 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2024 if (GCTimeLimit == 100) { 2025 // Turn off gc-overhead-limit-exceeded checks 2026 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2027 } 2028 2029 status = status && check_gc_consistency(); 2030 status = status && check_stack_pages(); 2031 2032 if (CMSIncrementalMode) { 2033 if (!UseConcMarkSweepGC) { 2034 jio_fprintf(defaultStream::error_stream(), 2035 "error: invalid argument combination.\n" 2036 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2037 "selected in order\nto use CMSIncrementalMode.\n"); 2038 status = false; 2039 } else { 2040 status = status && verify_percentage(CMSIncrementalDutyCycle, 2041 "CMSIncrementalDutyCycle"); 2042 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2043 "CMSIncrementalDutyCycleMin"); 2044 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2045 "CMSIncrementalSafetyFactor"); 2046 status = status && verify_percentage(CMSIncrementalOffset, 2047 "CMSIncrementalOffset"); 2048 status = status && verify_percentage(CMSExpAvgFactor, 2049 "CMSExpAvgFactor"); 2050 // If it was not set on the command line, set 2051 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2052 if (CMSInitiatingOccupancyFraction < 0) { 2053 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2054 } 2055 } 2056 } 2057 2058 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2059 // insists that we hold the requisite locks so that the iteration is 2060 // MT-safe. For the verification at start-up and shut-down, we don't 2061 // yet have a good way of acquiring and releasing these locks, 2062 // which are not visible at the CollectedHeap level. We want to 2063 // be able to acquire these locks and then do the iteration rather 2064 // than just disable the lock verification. This will be fixed under 2065 // bug 4788986. 2066 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2067 if (VerifyDuringStartup) { 2068 warning("Heap verification at start-up disabled " 2069 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2070 VerifyDuringStartup = false; // Disable verification at start-up 2071 } 2072 2073 if (VerifyBeforeExit) { 2074 warning("Heap verification at shutdown disabled " 2075 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2076 VerifyBeforeExit = false; // Disable verification at shutdown 2077 } 2078 } 2079 2080 // Note: only executed in non-PRODUCT mode 2081 if (!UseAsyncConcMarkSweepGC && 2082 (ExplicitGCInvokesConcurrent || 2083 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2084 jio_fprintf(defaultStream::error_stream(), 2085 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2086 " with -UseAsyncConcMarkSweepGC"); 2087 status = false; 2088 } 2089 2090 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2091 2092 #if INCLUDE_ALL_GCS 2093 if (UseG1GC) { 2094 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2095 "InitiatingHeapOccupancyPercent"); 2096 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2097 "G1RefProcDrainInterval"); 2098 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2099 "G1ConcMarkStepDurationMillis"); 2100 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2101 "G1ConcRSHotCardLimit"); 2102 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2103 "G1ConcRSLogCacheSize"); 2104 } 2105 if (UseConcMarkSweepGC) { 2106 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2107 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2108 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2109 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2110 2111 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2112 2113 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2114 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2115 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2116 2117 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2118 2119 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2120 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2121 2122 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2123 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2124 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2125 2126 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2127 2128 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2129 2130 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2131 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2132 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2133 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2134 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2135 } 2136 2137 if (UseParallelGC || UseParallelOldGC) { 2138 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2139 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2140 2141 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2142 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2143 2144 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2145 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2146 2147 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2148 2149 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2150 } 2151 #endif // INCLUDE_ALL_GCS 2152 2153 status = status && verify_interval(RefDiscoveryPolicy, 2154 ReferenceProcessor::DiscoveryPolicyMin, 2155 ReferenceProcessor::DiscoveryPolicyMax, 2156 "RefDiscoveryPolicy"); 2157 2158 // Limit the lower bound of this flag to 1 as it is used in a division 2159 // expression. 2160 status = status && verify_interval(TLABWasteTargetPercent, 2161 1, 100, "TLABWasteTargetPercent"); 2162 2163 status = status && verify_object_alignment(); 2164 2165 status = status && verify_interval(ClassMetaspaceSize, 1*M, 3*G, 2166 "ClassMetaspaceSize"); 2167 2168 status = status && verify_interval(MarkStackSizeMax, 2169 1, (max_jint - 1), "MarkStackSizeMax"); 2170 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2171 2172 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2173 2174 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2175 2176 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2177 2178 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2179 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2180 2181 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2182 2183 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2184 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2185 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2186 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2187 2188 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2189 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2190 2191 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2192 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2193 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2194 2195 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2196 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2197 2198 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2199 // just for that, so hardcode here. 2200 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2201 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2202 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2203 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2204 2205 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2206 #ifdef SPARC 2207 if (UseConcMarkSweepGC || UseG1GC) { 2208 // Issue a stern warning if the user has explicitly set 2209 // UseMemSetInBOT (it is known to cause issues), but allow 2210 // use for experimentation and debugging. 2211 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2212 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2213 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2214 " on sun4v; please understand that you are using at your own risk!"); 2215 } 2216 } 2217 #endif // SPARC 2218 2219 if (PrintNMTStatistics) { 2220 #if INCLUDE_NMT 2221 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2222 #endif // INCLUDE_NMT 2223 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2224 PrintNMTStatistics = false; 2225 #if INCLUDE_NMT 2226 } 2227 #endif 2228 } 2229 2230 // Need to limit the extent of the padding to reasonable size. 2231 // 8K is well beyond the reasonable HW cache line size, even with the 2232 // aggressive prefetching, while still leaving the room for segregating 2233 // among the distinct pages. 2234 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2235 jio_fprintf(defaultStream::error_stream(), 2236 "ContendedPaddingWidth=" INTX_FORMAT " must be the between %d and %d\n", 2237 ContendedPaddingWidth, 0, 8192); 2238 status = false; 2239 } 2240 2241 // Need to enforce the padding not to break the existing field alignments. 2242 // It is sufficient to check against the largest type size. 2243 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2244 jio_fprintf(defaultStream::error_stream(), 2245 "ContendedPaddingWidth=" INTX_FORMAT " must be the multiple of %d\n", 2246 ContendedPaddingWidth, BytesPerLong); 2247 status = false; 2248 } 2249 2250 // Check lower bounds of the code cache 2251 // Template Interpreter code is approximately 3X larger in debug builds. 2252 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2253 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2254 jio_fprintf(defaultStream::error_stream(), 2255 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2256 os::vm_page_size()/K); 2257 status = false; 2258 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2259 jio_fprintf(defaultStream::error_stream(), 2260 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2261 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2262 status = false; 2263 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2264 jio_fprintf(defaultStream::error_stream(), 2265 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2266 min_code_cache_size/K); 2267 status = false; 2268 } else if (ReservedCodeCacheSize > 2*G) { 2269 // Code cache size larger than MAXINT is not supported. 2270 jio_fprintf(defaultStream::error_stream(), 2271 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2272 (2*G)/M); 2273 status = false; 2274 } 2275 2276 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2277 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2278 2279 return status; 2280 } 2281 2282 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2283 const char* option_type) { 2284 if (ignore) return false; 2285 2286 const char* spacer = " "; 2287 if (option_type == NULL) { 2288 option_type = ++spacer; // Set both to the empty string. 2289 } 2290 2291 if (os::obsolete_option(option)) { 2292 jio_fprintf(defaultStream::error_stream(), 2293 "Obsolete %s%soption: %s\n", option_type, spacer, 2294 option->optionString); 2295 return false; 2296 } else { 2297 jio_fprintf(defaultStream::error_stream(), 2298 "Unrecognized %s%soption: %s\n", option_type, spacer, 2299 option->optionString); 2300 return true; 2301 } 2302 } 2303 2304 static const char* user_assertion_options[] = { 2305 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2306 }; 2307 2308 static const char* system_assertion_options[] = { 2309 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2310 }; 2311 2312 // Return true if any of the strings in null-terminated array 'names' matches. 2313 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2314 // the option must match exactly. 2315 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2316 bool tail_allowed) { 2317 for (/* empty */; *names != NULL; ++names) { 2318 if (match_option(option, *names, tail)) { 2319 if (**tail == '\0' || tail_allowed && **tail == ':') { 2320 return true; 2321 } 2322 } 2323 } 2324 return false; 2325 } 2326 2327 bool Arguments::parse_uintx(const char* value, 2328 uintx* uintx_arg, 2329 uintx min_size) { 2330 2331 // Check the sign first since atomull() parses only unsigned values. 2332 bool value_is_positive = !(*value == '-'); 2333 2334 if (value_is_positive) { 2335 julong n; 2336 bool good_return = atomull(value, &n); 2337 if (good_return) { 2338 bool above_minimum = n >= min_size; 2339 bool value_is_too_large = n > max_uintx; 2340 2341 if (above_minimum && !value_is_too_large) { 2342 *uintx_arg = n; 2343 return true; 2344 } 2345 } 2346 } 2347 return false; 2348 } 2349 2350 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2351 julong* long_arg, 2352 julong min_size) { 2353 if (!atomull(s, long_arg)) return arg_unreadable; 2354 return check_memory_size(*long_arg, min_size); 2355 } 2356 2357 // Parse JavaVMInitArgs structure 2358 2359 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2360 // For components of the system classpath. 2361 SysClassPath scp(Arguments::get_sysclasspath()); 2362 bool scp_assembly_required = false; 2363 2364 // Save default settings for some mode flags 2365 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2366 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2367 Arguments::_ClipInlining = ClipInlining; 2368 Arguments::_BackgroundCompilation = BackgroundCompilation; 2369 2370 // Setup flags for mixed which is the default 2371 set_mode_flags(_mixed); 2372 2373 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2374 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2375 if (result != JNI_OK) { 2376 return result; 2377 } 2378 2379 // Parse JavaVMInitArgs structure passed in 2380 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2381 if (result != JNI_OK) { 2382 return result; 2383 } 2384 2385 if (AggressiveOpts) { 2386 // Insert alt-rt.jar between user-specified bootclasspath 2387 // prefix and the default bootclasspath. os::set_boot_path() 2388 // uses meta_index_dir as the default bootclasspath directory. 2389 const char* altclasses_jar = "alt-rt.jar"; 2390 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2391 strlen(altclasses_jar); 2392 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2393 strcpy(altclasses_path, get_meta_index_dir()); 2394 strcat(altclasses_path, altclasses_jar); 2395 scp.add_suffix_to_prefix(altclasses_path); 2396 scp_assembly_required = true; 2397 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2398 } 2399 2400 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2401 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2402 if (result != JNI_OK) { 2403 return result; 2404 } 2405 2406 // Do final processing now that all arguments have been parsed 2407 result = finalize_vm_init_args(&scp, scp_assembly_required); 2408 if (result != JNI_OK) { 2409 return result; 2410 } 2411 2412 return JNI_OK; 2413 } 2414 2415 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2416 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2417 // are dealing with -agentpath (case where name is a path), otherwise with 2418 // -agentlib 2419 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2420 char *_name; 2421 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2422 size_t _len_hprof, _len_jdwp, _len_prefix; 2423 2424 if (is_path) { 2425 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2426 return false; 2427 } 2428 2429 _name++; // skip past last path separator 2430 _len_prefix = strlen(JNI_LIB_PREFIX); 2431 2432 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2433 return false; 2434 } 2435 2436 _name += _len_prefix; 2437 _len_hprof = strlen(_hprof); 2438 _len_jdwp = strlen(_jdwp); 2439 2440 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2441 _name += _len_hprof; 2442 } 2443 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2444 _name += _len_jdwp; 2445 } 2446 else { 2447 return false; 2448 } 2449 2450 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2451 return false; 2452 } 2453 2454 return true; 2455 } 2456 2457 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2458 return true; 2459 } 2460 2461 return false; 2462 } 2463 2464 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2465 SysClassPath* scp_p, 2466 bool* scp_assembly_required_p, 2467 FlagValueOrigin origin) { 2468 // Remaining part of option string 2469 const char* tail; 2470 2471 // iterate over arguments 2472 for (int index = 0; index < args->nOptions; index++) { 2473 bool is_absolute_path = false; // for -agentpath vs -agentlib 2474 2475 const JavaVMOption* option = args->options + index; 2476 2477 if (!match_option(option, "-Djava.class.path", &tail) && 2478 !match_option(option, "-Dsun.java.command", &tail) && 2479 !match_option(option, "-Dsun.java.launcher", &tail)) { 2480 2481 // add all jvm options to the jvm_args string. This string 2482 // is used later to set the java.vm.args PerfData string constant. 2483 // the -Djava.class.path and the -Dsun.java.command options are 2484 // omitted from jvm_args string as each have their own PerfData 2485 // string constant object. 2486 build_jvm_args(option->optionString); 2487 } 2488 2489 // -verbose:[class/gc/jni] 2490 if (match_option(option, "-verbose", &tail)) { 2491 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2492 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2493 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2494 } else if (!strcmp(tail, ":gc")) { 2495 FLAG_SET_CMDLINE(bool, PrintGC, true); 2496 } else if (!strcmp(tail, ":jni")) { 2497 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2498 } 2499 // -da / -ea / -disableassertions / -enableassertions 2500 // These accept an optional class/package name separated by a colon, e.g., 2501 // -da:java.lang.Thread. 2502 } else if (match_option(option, user_assertion_options, &tail, true)) { 2503 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2504 if (*tail == '\0') { 2505 JavaAssertions::setUserClassDefault(enable); 2506 } else { 2507 assert(*tail == ':', "bogus match by match_option()"); 2508 JavaAssertions::addOption(tail + 1, enable); 2509 } 2510 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2511 } else if (match_option(option, system_assertion_options, &tail, false)) { 2512 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2513 JavaAssertions::setSystemClassDefault(enable); 2514 // -bootclasspath: 2515 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2516 scp_p->reset_path(tail); 2517 *scp_assembly_required_p = true; 2518 // -bootclasspath/a: 2519 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2520 scp_p->add_suffix(tail); 2521 *scp_assembly_required_p = true; 2522 // -bootclasspath/p: 2523 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2524 scp_p->add_prefix(tail); 2525 *scp_assembly_required_p = true; 2526 // -Xrun 2527 } else if (match_option(option, "-Xrun", &tail)) { 2528 if (tail != NULL) { 2529 const char* pos = strchr(tail, ':'); 2530 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2531 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2532 name[len] = '\0'; 2533 2534 char *options = NULL; 2535 if(pos != NULL) { 2536 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2537 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2538 } 2539 #if !INCLUDE_JVMTI 2540 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2541 jio_fprintf(defaultStream::error_stream(), 2542 "Profiling and debugging agents are not supported in this VM\n"); 2543 return JNI_ERR; 2544 } 2545 #endif // !INCLUDE_JVMTI 2546 add_init_library(name, options); 2547 } 2548 // -agentlib and -agentpath 2549 } else if (match_option(option, "-agentlib:", &tail) || 2550 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2551 if(tail != NULL) { 2552 const char* pos = strchr(tail, '='); 2553 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2554 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2555 name[len] = '\0'; 2556 2557 char *options = NULL; 2558 if(pos != NULL) { 2559 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2560 } 2561 #if !INCLUDE_JVMTI 2562 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2563 jio_fprintf(defaultStream::error_stream(), 2564 "Profiling and debugging agents are not supported in this VM\n"); 2565 return JNI_ERR; 2566 } 2567 #endif // !INCLUDE_JVMTI 2568 add_init_agent(name, options, is_absolute_path); 2569 } 2570 // -javaagent 2571 } else if (match_option(option, "-javaagent:", &tail)) { 2572 #if !INCLUDE_JVMTI 2573 jio_fprintf(defaultStream::error_stream(), 2574 "Instrumentation agents are not supported in this VM\n"); 2575 return JNI_ERR; 2576 #else 2577 if(tail != NULL) { 2578 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2579 add_init_agent("instrument", options, false); 2580 } 2581 #endif // !INCLUDE_JVMTI 2582 // -Xnoclassgc 2583 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2584 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2585 // -Xincgc: i-CMS 2586 } else if (match_option(option, "-Xincgc", &tail)) { 2587 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2588 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2589 // -Xnoincgc: no i-CMS 2590 } else if (match_option(option, "-Xnoincgc", &tail)) { 2591 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2592 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2593 // -Xconcgc 2594 } else if (match_option(option, "-Xconcgc", &tail)) { 2595 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2596 // -Xnoconcgc 2597 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2598 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2599 // -Xbatch 2600 } else if (match_option(option, "-Xbatch", &tail)) { 2601 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2602 // -Xmn for compatibility with other JVM vendors 2603 } else if (match_option(option, "-Xmn", &tail)) { 2604 julong long_initial_eden_size = 0; 2605 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2606 if (errcode != arg_in_range) { 2607 jio_fprintf(defaultStream::error_stream(), 2608 "Invalid initial eden size: %s\n", option->optionString); 2609 describe_range_error(errcode); 2610 return JNI_EINVAL; 2611 } 2612 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2613 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2614 // -Xms 2615 } else if (match_option(option, "-Xms", &tail)) { 2616 julong long_initial_heap_size = 0; 2617 // an initial heap size of 0 means automatically determine 2618 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2619 if (errcode != arg_in_range) { 2620 jio_fprintf(defaultStream::error_stream(), 2621 "Invalid initial heap size: %s\n", option->optionString); 2622 describe_range_error(errcode); 2623 return JNI_EINVAL; 2624 } 2625 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2626 // Currently the minimum size and the initial heap sizes are the same. 2627 set_min_heap_size(InitialHeapSize); 2628 // -Xmx 2629 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2630 julong long_max_heap_size = 0; 2631 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2632 if (errcode != arg_in_range) { 2633 jio_fprintf(defaultStream::error_stream(), 2634 "Invalid maximum heap size: %s\n", option->optionString); 2635 describe_range_error(errcode); 2636 return JNI_EINVAL; 2637 } 2638 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2639 // Xmaxf 2640 } else if (match_option(option, "-Xmaxf", &tail)) { 2641 int maxf = (int)(atof(tail) * 100); 2642 if (maxf < 0 || maxf > 100) { 2643 jio_fprintf(defaultStream::error_stream(), 2644 "Bad max heap free percentage size: %s\n", 2645 option->optionString); 2646 return JNI_EINVAL; 2647 } else { 2648 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2649 } 2650 // Xminf 2651 } else if (match_option(option, "-Xminf", &tail)) { 2652 int minf = (int)(atof(tail) * 100); 2653 if (minf < 0 || minf > 100) { 2654 jio_fprintf(defaultStream::error_stream(), 2655 "Bad min heap free percentage size: %s\n", 2656 option->optionString); 2657 return JNI_EINVAL; 2658 } else { 2659 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2660 } 2661 // -Xss 2662 } else if (match_option(option, "-Xss", &tail)) { 2663 julong long_ThreadStackSize = 0; 2664 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2665 if (errcode != arg_in_range) { 2666 jio_fprintf(defaultStream::error_stream(), 2667 "Invalid thread stack size: %s\n", option->optionString); 2668 describe_range_error(errcode); 2669 return JNI_EINVAL; 2670 } 2671 // Internally track ThreadStackSize in units of 1024 bytes. 2672 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2673 round_to((int)long_ThreadStackSize, K) / K); 2674 // -Xoss 2675 } else if (match_option(option, "-Xoss", &tail)) { 2676 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2677 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2678 julong long_CodeCacheExpansionSize = 0; 2679 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2680 if (errcode != arg_in_range) { 2681 jio_fprintf(defaultStream::error_stream(), 2682 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2683 os::vm_page_size()/K); 2684 return JNI_EINVAL; 2685 } 2686 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2687 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2688 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2689 julong long_ReservedCodeCacheSize = 0; 2690 2691 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2692 if (errcode != arg_in_range) { 2693 jio_fprintf(defaultStream::error_stream(), 2694 "Invalid maximum code cache size: %s.\n", option->optionString); 2695 return JNI_EINVAL; 2696 } 2697 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2698 //-XX:IncreaseFirstTierCompileThresholdAt= 2699 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2700 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2701 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2702 jio_fprintf(defaultStream::error_stream(), 2703 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2704 option->optionString); 2705 return JNI_EINVAL; 2706 } 2707 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2708 // -green 2709 } else if (match_option(option, "-green", &tail)) { 2710 jio_fprintf(defaultStream::error_stream(), 2711 "Green threads support not available\n"); 2712 return JNI_EINVAL; 2713 // -native 2714 } else if (match_option(option, "-native", &tail)) { 2715 // HotSpot always uses native threads, ignore silently for compatibility 2716 // -Xsqnopause 2717 } else if (match_option(option, "-Xsqnopause", &tail)) { 2718 // EVM option, ignore silently for compatibility 2719 // -Xrs 2720 } else if (match_option(option, "-Xrs", &tail)) { 2721 // Classic/EVM option, new functionality 2722 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2723 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2724 // change default internal VM signals used - lower case for back compat 2725 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2726 // -Xoptimize 2727 } else if (match_option(option, "-Xoptimize", &tail)) { 2728 // EVM option, ignore silently for compatibility 2729 // -Xprof 2730 } else if (match_option(option, "-Xprof", &tail)) { 2731 #if INCLUDE_FPROF 2732 _has_profile = true; 2733 #else // INCLUDE_FPROF 2734 jio_fprintf(defaultStream::error_stream(), 2735 "Flat profiling is not supported in this VM.\n"); 2736 return JNI_ERR; 2737 #endif // INCLUDE_FPROF 2738 // -Xconcurrentio 2739 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2740 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2741 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2742 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2743 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2744 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2745 2746 // -Xinternalversion 2747 } else if (match_option(option, "-Xinternalversion", &tail)) { 2748 jio_fprintf(defaultStream::output_stream(), "%s\n", 2749 VM_Version::internal_vm_info_string()); 2750 vm_exit(0); 2751 #ifndef PRODUCT 2752 // -Xprintflags 2753 } else if (match_option(option, "-Xprintflags", &tail)) { 2754 CommandLineFlags::printFlags(tty, false); 2755 vm_exit(0); 2756 #endif 2757 // -D 2758 } else if (match_option(option, "-D", &tail)) { 2759 if (!add_property(tail)) { 2760 return JNI_ENOMEM; 2761 } 2762 // Out of the box management support 2763 if (match_option(option, "-Dcom.sun.management", &tail)) { 2764 #if INCLUDE_MANAGEMENT 2765 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2766 #else 2767 jio_fprintf(defaultStream::output_stream(), 2768 "-Dcom.sun.management is not supported in this VM.\n"); 2769 return JNI_ERR; 2770 #endif 2771 } 2772 // -Xint 2773 } else if (match_option(option, "-Xint", &tail)) { 2774 set_mode_flags(_int); 2775 // -Xmixed 2776 } else if (match_option(option, "-Xmixed", &tail)) { 2777 set_mode_flags(_mixed); 2778 // -Xcomp 2779 } else if (match_option(option, "-Xcomp", &tail)) { 2780 // for testing the compiler; turn off all flags that inhibit compilation 2781 set_mode_flags(_comp); 2782 // -Xshare:dump 2783 } else if (match_option(option, "-Xshare:dump", &tail)) { 2784 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2785 set_mode_flags(_int); // Prevent compilation, which creates objects 2786 // -Xshare:on 2787 } else if (match_option(option, "-Xshare:on", &tail)) { 2788 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2789 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2790 // -Xshare:auto 2791 } else if (match_option(option, "-Xshare:auto", &tail)) { 2792 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2793 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2794 // -Xshare:off 2795 } else if (match_option(option, "-Xshare:off", &tail)) { 2796 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2797 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2798 // -Xverify 2799 } else if (match_option(option, "-Xverify", &tail)) { 2800 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2801 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2802 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2803 } else if (strcmp(tail, ":remote") == 0) { 2804 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2805 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2806 } else if (strcmp(tail, ":none") == 0) { 2807 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2808 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2809 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2810 return JNI_EINVAL; 2811 } 2812 // -Xdebug 2813 } else if (match_option(option, "-Xdebug", &tail)) { 2814 // note this flag has been used, then ignore 2815 set_xdebug_mode(true); 2816 // -Xnoagent 2817 } else if (match_option(option, "-Xnoagent", &tail)) { 2818 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2819 } else if (match_option(option, "-Xboundthreads", &tail)) { 2820 // Bind user level threads to kernel threads (Solaris only) 2821 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2822 } else if (match_option(option, "-Xloggc:", &tail)) { 2823 // Redirect GC output to the file. -Xloggc:<filename> 2824 // ostream_init_log(), when called will use this filename 2825 // to initialize a fileStream. 2826 _gc_log_filename = strdup(tail); 2827 FLAG_SET_CMDLINE(bool, PrintGC, true); 2828 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2829 2830 // JNI hooks 2831 } else if (match_option(option, "-Xcheck", &tail)) { 2832 if (!strcmp(tail, ":jni")) { 2833 #if !INCLUDE_JNI_CHECK 2834 warning("JNI CHECKING is not supported in this VM"); 2835 #else 2836 CheckJNICalls = true; 2837 #endif // INCLUDE_JNI_CHECK 2838 } else if (is_bad_option(option, args->ignoreUnrecognized, 2839 "check")) { 2840 return JNI_EINVAL; 2841 } 2842 } else if (match_option(option, "vfprintf", &tail)) { 2843 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2844 } else if (match_option(option, "exit", &tail)) { 2845 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2846 } else if (match_option(option, "abort", &tail)) { 2847 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2848 // -XX:+AggressiveHeap 2849 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2850 2851 // This option inspects the machine and attempts to set various 2852 // parameters to be optimal for long-running, memory allocation 2853 // intensive jobs. It is intended for machines with large 2854 // amounts of cpu and memory. 2855 2856 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2857 // VM, but we may not be able to represent the total physical memory 2858 // available (like having 8gb of memory on a box but using a 32bit VM). 2859 // Thus, we need to make sure we're using a julong for intermediate 2860 // calculations. 2861 julong initHeapSize; 2862 julong total_memory = os::physical_memory(); 2863 2864 if (total_memory < (julong)256*M) { 2865 jio_fprintf(defaultStream::error_stream(), 2866 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2867 vm_exit(1); 2868 } 2869 2870 // The heap size is half of available memory, or (at most) 2871 // all of possible memory less 160mb (leaving room for the OS 2872 // when using ISM). This is the maximum; because adaptive sizing 2873 // is turned on below, the actual space used may be smaller. 2874 2875 initHeapSize = MIN2(total_memory / (julong)2, 2876 total_memory - (julong)160*M); 2877 2878 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2879 2880 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2881 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2882 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2883 // Currently the minimum size and the initial heap sizes are the same. 2884 set_min_heap_size(initHeapSize); 2885 } 2886 if (FLAG_IS_DEFAULT(NewSize)) { 2887 // Make the young generation 3/8ths of the total heap. 2888 FLAG_SET_CMDLINE(uintx, NewSize, 2889 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2890 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2891 } 2892 2893 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2894 FLAG_SET_DEFAULT(UseLargePages, true); 2895 #endif 2896 2897 // Increase some data structure sizes for efficiency 2898 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2899 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2900 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2901 2902 // See the OldPLABSize comment below, but replace 'after promotion' 2903 // with 'after copying'. YoungPLABSize is the size of the survivor 2904 // space per-gc-thread buffers. The default is 4kw. 2905 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2906 2907 // OldPLABSize is the size of the buffers in the old gen that 2908 // UseParallelGC uses to promote live data that doesn't fit in the 2909 // survivor spaces. At any given time, there's one for each gc thread. 2910 // The default size is 1kw. These buffers are rarely used, since the 2911 // survivor spaces are usually big enough. For specjbb, however, there 2912 // are occasions when there's lots of live data in the young gen 2913 // and we end up promoting some of it. We don't have a definite 2914 // explanation for why bumping OldPLABSize helps, but the theory 2915 // is that a bigger PLAB results in retaining something like the 2916 // original allocation order after promotion, which improves mutator 2917 // locality. A minor effect may be that larger PLABs reduce the 2918 // number of PLAB allocation events during gc. The value of 8kw 2919 // was arrived at by experimenting with specjbb. 2920 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2921 2922 // Enable parallel GC and adaptive generation sizing 2923 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2924 FLAG_SET_DEFAULT(ParallelGCThreads, 2925 Abstract_VM_Version::parallel_worker_threads()); 2926 2927 // Encourage steady state memory management 2928 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2929 2930 // This appears to improve mutator locality 2931 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2932 2933 // Get around early Solaris scheduling bug 2934 // (affinity vs other jobs on system) 2935 // but disallow DR and offlining (5008695). 2936 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2937 2938 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2939 // The last option must always win. 2940 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2941 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2942 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2943 // The last option must always win. 2944 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2945 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2946 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2947 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2948 jio_fprintf(defaultStream::error_stream(), 2949 "Please use CMSClassUnloadingEnabled in place of " 2950 "CMSPermGenSweepingEnabled in the future\n"); 2951 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2952 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2953 jio_fprintf(defaultStream::error_stream(), 2954 "Please use -XX:+UseGCOverheadLimit in place of " 2955 "-XX:+UseGCTimeLimit in the future\n"); 2956 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2957 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2958 jio_fprintf(defaultStream::error_stream(), 2959 "Please use -XX:-UseGCOverheadLimit in place of " 2960 "-XX:-UseGCTimeLimit in the future\n"); 2961 // The TLE options are for compatibility with 1.3 and will be 2962 // removed without notice in a future release. These options 2963 // are not to be documented. 2964 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2965 // No longer used. 2966 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2967 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2968 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2969 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2970 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2971 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2972 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2973 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2974 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2975 // No longer used. 2976 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2977 julong long_tlab_size = 0; 2978 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2979 if (errcode != arg_in_range) { 2980 jio_fprintf(defaultStream::error_stream(), 2981 "Invalid TLAB size: %s\n", option->optionString); 2982 describe_range_error(errcode); 2983 return JNI_EINVAL; 2984 } 2985 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2986 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2987 // No longer used. 2988 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2989 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2990 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2991 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2992 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2993 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2994 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2995 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2996 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2997 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2998 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2999 #if defined(DTRACE_ENABLED) 3000 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3001 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3002 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3003 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3004 #else // defined(DTRACE_ENABLED) 3005 jio_fprintf(defaultStream::error_stream(), 3006 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3007 return JNI_EINVAL; 3008 #endif // defined(DTRACE_ENABLED) 3009 #ifdef ASSERT 3010 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3011 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3012 // disable scavenge before parallel mark-compact 3013 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3014 #endif 3015 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3016 julong cms_blocks_to_claim = (julong)atol(tail); 3017 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3018 jio_fprintf(defaultStream::error_stream(), 3019 "Please use -XX:OldPLABSize in place of " 3020 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3021 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3022 julong cms_blocks_to_claim = (julong)atol(tail); 3023 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3024 jio_fprintf(defaultStream::error_stream(), 3025 "Please use -XX:OldPLABSize in place of " 3026 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3027 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3028 julong old_plab_size = 0; 3029 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3030 if (errcode != arg_in_range) { 3031 jio_fprintf(defaultStream::error_stream(), 3032 "Invalid old PLAB size: %s\n", option->optionString); 3033 describe_range_error(errcode); 3034 return JNI_EINVAL; 3035 } 3036 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3037 jio_fprintf(defaultStream::error_stream(), 3038 "Please use -XX:OldPLABSize in place of " 3039 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3040 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3041 julong young_plab_size = 0; 3042 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3043 if (errcode != arg_in_range) { 3044 jio_fprintf(defaultStream::error_stream(), 3045 "Invalid young PLAB size: %s\n", option->optionString); 3046 describe_range_error(errcode); 3047 return JNI_EINVAL; 3048 } 3049 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3050 jio_fprintf(defaultStream::error_stream(), 3051 "Please use -XX:YoungPLABSize in place of " 3052 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3053 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3054 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3055 julong stack_size = 0; 3056 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3057 if (errcode != arg_in_range) { 3058 jio_fprintf(defaultStream::error_stream(), 3059 "Invalid mark stack size: %s\n", option->optionString); 3060 describe_range_error(errcode); 3061 return JNI_EINVAL; 3062 } 3063 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3064 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3065 julong max_stack_size = 0; 3066 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3067 if (errcode != arg_in_range) { 3068 jio_fprintf(defaultStream::error_stream(), 3069 "Invalid maximum mark stack size: %s\n", 3070 option->optionString); 3071 describe_range_error(errcode); 3072 return JNI_EINVAL; 3073 } 3074 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3075 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3076 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3077 uintx conc_threads = 0; 3078 if (!parse_uintx(tail, &conc_threads, 1)) { 3079 jio_fprintf(defaultStream::error_stream(), 3080 "Invalid concurrent threads: %s\n", option->optionString); 3081 return JNI_EINVAL; 3082 } 3083 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3084 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3085 julong max_direct_memory_size = 0; 3086 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3087 if (errcode != arg_in_range) { 3088 jio_fprintf(defaultStream::error_stream(), 3089 "Invalid maximum direct memory size: %s\n", 3090 option->optionString); 3091 describe_range_error(errcode); 3092 return JNI_EINVAL; 3093 } 3094 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3095 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3096 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3097 // away and will cause VM initialization failures! 3098 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3099 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3100 #if !INCLUDE_MANAGEMENT 3101 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3102 jio_fprintf(defaultStream::error_stream(), 3103 "ManagementServer is not supported in this VM.\n"); 3104 return JNI_ERR; 3105 #endif // INCLUDE_MANAGEMENT 3106 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3107 // Skip -XX:Flags= since that case has already been handled 3108 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3109 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3110 return JNI_EINVAL; 3111 } 3112 } 3113 // Unknown option 3114 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3115 return JNI_ERR; 3116 } 3117 } 3118 3119 // Change the default value for flags which have different default values 3120 // when working with older JDKs. 3121 #ifdef LINUX 3122 if (JDK_Version::current().compare_major(6) <= 0 && 3123 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3124 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3125 } 3126 #endif // LINUX 3127 return JNI_OK; 3128 } 3129 3130 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3131 // This must be done after all -D arguments have been processed. 3132 scp_p->expand_endorsed(); 3133 3134 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3135 // Assemble the bootclasspath elements into the final path. 3136 Arguments::set_sysclasspath(scp_p->combined_path()); 3137 } 3138 3139 // This must be done after all arguments have been processed. 3140 // java_compiler() true means set to "NONE" or empty. 3141 if (java_compiler() && !xdebug_mode()) { 3142 // For backwards compatibility, we switch to interpreted mode if 3143 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3144 // not specified. 3145 set_mode_flags(_int); 3146 } 3147 if (CompileThreshold == 0) { 3148 set_mode_flags(_int); 3149 } 3150 3151 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3152 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3153 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3154 } 3155 3156 #ifndef COMPILER2 3157 // Don't degrade server performance for footprint 3158 if (FLAG_IS_DEFAULT(UseLargePages) && 3159 MaxHeapSize < LargePageHeapSizeThreshold) { 3160 // No need for large granularity pages w/small heaps. 3161 // Note that large pages are enabled/disabled for both the 3162 // Java heap and the code cache. 3163 FLAG_SET_DEFAULT(UseLargePages, false); 3164 } 3165 3166 #else 3167 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3168 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3169 } 3170 #endif 3171 3172 #ifndef TIERED 3173 // Tiered compilation is undefined. 3174 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3175 #endif 3176 3177 // If we are running in a headless jre, force java.awt.headless property 3178 // to be true unless the property has already been set. 3179 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3180 if (os::is_headless_jre()) { 3181 const char* headless = Arguments::get_property("java.awt.headless"); 3182 if (headless == NULL) { 3183 char envbuffer[128]; 3184 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3185 if (!add_property("java.awt.headless=true")) { 3186 return JNI_ENOMEM; 3187 } 3188 } else { 3189 char buffer[256]; 3190 strcpy(buffer, "java.awt.headless="); 3191 strcat(buffer, envbuffer); 3192 if (!add_property(buffer)) { 3193 return JNI_ENOMEM; 3194 } 3195 } 3196 } 3197 } 3198 3199 if (!check_vm_args_consistency()) { 3200 return JNI_ERR; 3201 } 3202 3203 return JNI_OK; 3204 } 3205 3206 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3207 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3208 scp_assembly_required_p); 3209 } 3210 3211 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3212 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3213 scp_assembly_required_p); 3214 } 3215 3216 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3217 const int N_MAX_OPTIONS = 64; 3218 const int OPTION_BUFFER_SIZE = 1024; 3219 char buffer[OPTION_BUFFER_SIZE]; 3220 3221 // The variable will be ignored if it exceeds the length of the buffer. 3222 // Don't check this variable if user has special privileges 3223 // (e.g. unix su command). 3224 if (os::getenv(name, buffer, sizeof(buffer)) && 3225 !os::have_special_privileges()) { 3226 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3227 jio_fprintf(defaultStream::error_stream(), 3228 "Picked up %s: %s\n", name, buffer); 3229 char* rd = buffer; // pointer to the input string (rd) 3230 int i; 3231 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3232 while (isspace(*rd)) rd++; // skip whitespace 3233 if (*rd == 0) break; // we re done when the input string is read completely 3234 3235 // The output, option string, overwrites the input string. 3236 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3237 // input string (rd). 3238 char* wrt = rd; 3239 3240 options[i++].optionString = wrt; // Fill in option 3241 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3242 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3243 int quote = *rd; // matching quote to look for 3244 rd++; // don't copy open quote 3245 while (*rd != quote) { // include everything (even spaces) up until quote 3246 if (*rd == 0) { // string termination means unmatched string 3247 jio_fprintf(defaultStream::error_stream(), 3248 "Unmatched quote in %s\n", name); 3249 return JNI_ERR; 3250 } 3251 *wrt++ = *rd++; // copy to option string 3252 } 3253 rd++; // don't copy close quote 3254 } else { 3255 *wrt++ = *rd++; // copy to option string 3256 } 3257 } 3258 // Need to check if we're done before writing a NULL, 3259 // because the write could be to the byte that rd is pointing to. 3260 if (*rd++ == 0) { 3261 *wrt = 0; 3262 break; 3263 } 3264 *wrt = 0; // Zero terminate option 3265 } 3266 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3267 JavaVMInitArgs vm_args; 3268 vm_args.version = JNI_VERSION_1_2; 3269 vm_args.options = options; 3270 vm_args.nOptions = i; 3271 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3272 3273 if (PrintVMOptions) { 3274 const char* tail; 3275 for (int i = 0; i < vm_args.nOptions; i++) { 3276 const JavaVMOption *option = vm_args.options + i; 3277 if (match_option(option, "-XX:", &tail)) { 3278 logOption(tail); 3279 } 3280 } 3281 } 3282 3283 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3284 } 3285 return JNI_OK; 3286 } 3287 3288 void Arguments::set_shared_spaces_flags() { 3289 if (DumpSharedSpaces) { 3290 if (RequireSharedSpaces) { 3291 warning("cannot dump shared archive while using shared archive"); 3292 } 3293 UseSharedSpaces = false; 3294 #ifdef _LP64 3295 if (!UseCompressedOops || !UseCompressedKlassPointers) { 3296 vm_exit_during_initialization( 3297 "Cannot dump shared archive when UseCompressedOops or UseCompressedKlassPointers is off.", NULL); 3298 } 3299 } else { 3300 // UseCompressedOops and UseCompressedKlassPointers must be on for UseSharedSpaces. 3301 if (!UseCompressedOops || !UseCompressedKlassPointers) { 3302 no_shared_spaces(); 3303 } 3304 #endif 3305 } 3306 } 3307 3308 #if !INCLUDE_ALL_GCS 3309 static void force_serial_gc() { 3310 FLAG_SET_DEFAULT(UseSerialGC, true); 3311 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3312 UNSUPPORTED_GC_OPTION(UseG1GC); 3313 UNSUPPORTED_GC_OPTION(UseParallelGC); 3314 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3315 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3316 UNSUPPORTED_GC_OPTION(UseParNewGC); 3317 } 3318 #endif // INCLUDE_ALL_GCS 3319 3320 // Sharing support 3321 // Construct the path to the archive 3322 static char* get_shared_archive_path() { 3323 char *shared_archive_path; 3324 if (SharedArchiveFile == NULL) { 3325 char jvm_path[JVM_MAXPATHLEN]; 3326 os::jvm_path(jvm_path, sizeof(jvm_path)); 3327 char *end = strrchr(jvm_path, *os::file_separator()); 3328 if (end != NULL) *end = '\0'; 3329 size_t jvm_path_len = strlen(jvm_path); 3330 size_t file_sep_len = strlen(os::file_separator()); 3331 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3332 file_sep_len + 20, mtInternal); 3333 if (shared_archive_path != NULL) { 3334 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3335 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3336 strncat(shared_archive_path, "classes.jsa", 11); 3337 } 3338 } else { 3339 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3340 if (shared_archive_path != NULL) { 3341 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3342 } 3343 } 3344 return shared_archive_path; 3345 } 3346 3347 // Parse entry point called from JNI_CreateJavaVM 3348 3349 jint Arguments::parse(const JavaVMInitArgs* args) { 3350 3351 // Remaining part of option string 3352 const char* tail; 3353 3354 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3355 const char* hotspotrc = ".hotspotrc"; 3356 bool settings_file_specified = false; 3357 bool needs_hotspotrc_warning = false; 3358 3359 const char* flags_file; 3360 int index; 3361 for (index = 0; index < args->nOptions; index++) { 3362 const JavaVMOption *option = args->options + index; 3363 if (match_option(option, "-XX:Flags=", &tail)) { 3364 flags_file = tail; 3365 settings_file_specified = true; 3366 } 3367 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3368 PrintVMOptions = true; 3369 } 3370 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3371 PrintVMOptions = false; 3372 } 3373 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3374 IgnoreUnrecognizedVMOptions = true; 3375 } 3376 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3377 IgnoreUnrecognizedVMOptions = false; 3378 } 3379 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3380 CommandLineFlags::printFlags(tty, false); 3381 vm_exit(0); 3382 } 3383 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3384 #if INCLUDE_NMT 3385 MemTracker::init_tracking_options(tail); 3386 #else 3387 jio_fprintf(defaultStream::error_stream(), 3388 "Native Memory Tracking is not supported in this VM\n"); 3389 return JNI_ERR; 3390 #endif 3391 } 3392 3393 3394 #ifndef PRODUCT 3395 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3396 CommandLineFlags::printFlags(tty, true); 3397 vm_exit(0); 3398 } 3399 #endif 3400 } 3401 3402 if (IgnoreUnrecognizedVMOptions) { 3403 // uncast const to modify the flag args->ignoreUnrecognized 3404 *(jboolean*)(&args->ignoreUnrecognized) = true; 3405 } 3406 3407 // Parse specified settings file 3408 if (settings_file_specified) { 3409 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3410 return JNI_EINVAL; 3411 } 3412 } else { 3413 #ifdef ASSERT 3414 // Parse default .hotspotrc settings file 3415 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3416 return JNI_EINVAL; 3417 } 3418 #else 3419 struct stat buf; 3420 if (os::stat(hotspotrc, &buf) == 0) { 3421 needs_hotspotrc_warning = true; 3422 } 3423 #endif 3424 } 3425 3426 if (PrintVMOptions) { 3427 for (index = 0; index < args->nOptions; index++) { 3428 const JavaVMOption *option = args->options + index; 3429 if (match_option(option, "-XX:", &tail)) { 3430 logOption(tail); 3431 } 3432 } 3433 } 3434 3435 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3436 jint result = parse_vm_init_args(args); 3437 if (result != JNI_OK) { 3438 return result; 3439 } 3440 3441 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3442 SharedArchivePath = get_shared_archive_path(); 3443 if (SharedArchivePath == NULL) { 3444 return JNI_ENOMEM; 3445 } 3446 3447 // Delay warning until here so that we've had a chance to process 3448 // the -XX:-PrintWarnings flag 3449 if (needs_hotspotrc_warning) { 3450 warning("%s file is present but has been ignored. " 3451 "Run with -XX:Flags=%s to load the file.", 3452 hotspotrc, hotspotrc); 3453 } 3454 3455 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3456 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3457 #endif 3458 3459 #if INCLUDE_ALL_GCS 3460 #if (defined JAVASE_EMBEDDED || defined ARM) 3461 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3462 #endif 3463 #endif 3464 3465 #ifndef PRODUCT 3466 if (TraceBytecodesAt != 0) { 3467 TraceBytecodes = true; 3468 } 3469 if (CountCompiledCalls) { 3470 if (UseCounterDecay) { 3471 warning("UseCounterDecay disabled because CountCalls is set"); 3472 UseCounterDecay = false; 3473 } 3474 } 3475 #endif // PRODUCT 3476 3477 // JSR 292 is not supported before 1.7 3478 if (!JDK_Version::is_gte_jdk17x_version()) { 3479 if (EnableInvokeDynamic) { 3480 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3481 warning("JSR 292 is not supported before 1.7. Disabling support."); 3482 } 3483 EnableInvokeDynamic = false; 3484 } 3485 } 3486 3487 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3488 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3489 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3490 } 3491 ScavengeRootsInCode = 1; 3492 } 3493 3494 if (PrintGCDetails) { 3495 // Turn on -verbose:gc options as well 3496 PrintGC = true; 3497 } 3498 3499 if (!JDK_Version::is_gte_jdk18x_version()) { 3500 // To avoid changing the log format for 7 updates this flag is only 3501 // true by default in JDK8 and above. 3502 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3503 FLAG_SET_DEFAULT(PrintGCCause, false); 3504 } 3505 } 3506 3507 // Set object alignment values. 3508 set_object_alignment(); 3509 3510 #if !INCLUDE_ALL_GCS 3511 force_serial_gc(); 3512 #endif // INCLUDE_ALL_GCS 3513 #if !INCLUDE_CDS 3514 if (DumpSharedSpaces || RequireSharedSpaces) { 3515 jio_fprintf(defaultStream::error_stream(), 3516 "Shared spaces are not supported in this VM\n"); 3517 return JNI_ERR; 3518 } 3519 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3520 warning("Shared spaces are not supported in this VM"); 3521 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3522 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3523 } 3524 no_shared_spaces(); 3525 #endif // INCLUDE_CDS 3526 3527 // Set flags based on ergonomics. 3528 set_ergonomics_flags(); 3529 3530 set_shared_spaces_flags(); 3531 3532 // Check the GC selections again. 3533 if (!check_gc_consistency()) { 3534 return JNI_EINVAL; 3535 } 3536 3537 if (TieredCompilation) { 3538 set_tiered_flags(); 3539 } else { 3540 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3541 if (CompilationPolicyChoice >= 2) { 3542 vm_exit_during_initialization( 3543 "Incompatible compilation policy selected", NULL); 3544 } 3545 } 3546 3547 set_heap_base_min_address(); 3548 3549 // Set heap size based on available physical memory 3550 set_heap_size(); 3551 3552 #if INCLUDE_ALL_GCS 3553 // Set per-collector flags 3554 if (UseParallelGC || UseParallelOldGC) { 3555 set_parallel_gc_flags(); 3556 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3557 set_cms_and_parnew_gc_flags(); 3558 } else if (UseParNewGC) { // skipped if CMS is set above 3559 set_parnew_gc_flags(); 3560 } else if (UseG1GC) { 3561 set_g1_gc_flags(); 3562 } 3563 check_deprecated_gcs(); 3564 check_deprecated_gc_flags(); 3565 if (AssumeMP && !UseSerialGC) { 3566 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3567 warning("If the number of processors is expected to increase from one, then" 3568 " you should configure the number of parallel GC threads appropriately" 3569 " using -XX:ParallelGCThreads=N"); 3570 } 3571 } 3572 #else // INCLUDE_ALL_GCS 3573 assert(verify_serial_gc_flags(), "SerialGC unset"); 3574 #endif // INCLUDE_ALL_GCS 3575 3576 // Set bytecode rewriting flags 3577 set_bytecode_flags(); 3578 3579 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3580 set_aggressive_opts_flags(); 3581 3582 // Turn off biased locking for locking debug mode flags, 3583 // which are subtlely different from each other but neither works with 3584 // biased locking. 3585 if (UseHeavyMonitors 3586 #ifdef COMPILER1 3587 || !UseFastLocking 3588 #endif // COMPILER1 3589 ) { 3590 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3591 // flag set to true on command line; warn the user that they 3592 // can't enable biased locking here 3593 warning("Biased Locking is not supported with locking debug flags" 3594 "; ignoring UseBiasedLocking flag." ); 3595 } 3596 UseBiasedLocking = false; 3597 } 3598 3599 #ifdef CC_INTERP 3600 // Clear flags not supported by the C++ interpreter 3601 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3602 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3603 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3604 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3605 #endif // CC_INTERP 3606 3607 #ifdef COMPILER2 3608 if (!UseBiasedLocking || EmitSync != 0) { 3609 UseOptoBiasInlining = false; 3610 } 3611 if (!EliminateLocks) { 3612 EliminateNestedLocks = false; 3613 } 3614 if (!Inline) { 3615 IncrementalInline = false; 3616 } 3617 #ifndef PRODUCT 3618 if (!IncrementalInline) { 3619 AlwaysIncrementalInline = false; 3620 } 3621 #endif 3622 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3623 // incremental inlining: bump MaxNodeLimit 3624 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3625 } 3626 #endif 3627 3628 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3629 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3630 DebugNonSafepoints = true; 3631 } 3632 3633 #ifndef PRODUCT 3634 if (CompileTheWorld) { 3635 // Force NmethodSweeper to sweep whole CodeCache each time. 3636 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3637 NmethodSweepFraction = 1; 3638 } 3639 } 3640 #endif 3641 3642 if (PrintCommandLineFlags) { 3643 CommandLineFlags::printSetFlags(tty); 3644 } 3645 3646 // Apply CPU specific policy for the BiasedLocking 3647 if (UseBiasedLocking) { 3648 if (!VM_Version::use_biased_locking() && 3649 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3650 UseBiasedLocking = false; 3651 } 3652 } 3653 3654 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3655 // but only if not already set on the commandline 3656 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3657 bool set = false; 3658 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3659 if (!set) { 3660 FLAG_SET_DEFAULT(PauseAtExit, true); 3661 } 3662 } 3663 3664 return JNI_OK; 3665 } 3666 3667 jint Arguments::adjust_after_os() { 3668 #if INCLUDE_ALL_GCS 3669 if (UseParallelGC || UseParallelOldGC) { 3670 if (UseNUMA) { 3671 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3672 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3673 } 3674 // For those collectors or operating systems (eg, Windows) that do 3675 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3676 UseNUMAInterleaving = true; 3677 } 3678 } 3679 #endif // INCLUDE_ALL_GCS 3680 return JNI_OK; 3681 } 3682 3683 int Arguments::PropertyList_count(SystemProperty* pl) { 3684 int count = 0; 3685 while(pl != NULL) { 3686 count++; 3687 pl = pl->next(); 3688 } 3689 return count; 3690 } 3691 3692 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3693 assert(key != NULL, "just checking"); 3694 SystemProperty* prop; 3695 for (prop = pl; prop != NULL; prop = prop->next()) { 3696 if (strcmp(key, prop->key()) == 0) return prop->value(); 3697 } 3698 return NULL; 3699 } 3700 3701 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3702 int count = 0; 3703 const char* ret_val = NULL; 3704 3705 while(pl != NULL) { 3706 if(count >= index) { 3707 ret_val = pl->key(); 3708 break; 3709 } 3710 count++; 3711 pl = pl->next(); 3712 } 3713 3714 return ret_val; 3715 } 3716 3717 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3718 int count = 0; 3719 char* ret_val = NULL; 3720 3721 while(pl != NULL) { 3722 if(count >= index) { 3723 ret_val = pl->value(); 3724 break; 3725 } 3726 count++; 3727 pl = pl->next(); 3728 } 3729 3730 return ret_val; 3731 } 3732 3733 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3734 SystemProperty* p = *plist; 3735 if (p == NULL) { 3736 *plist = new_p; 3737 } else { 3738 while (p->next() != NULL) { 3739 p = p->next(); 3740 } 3741 p->set_next(new_p); 3742 } 3743 } 3744 3745 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3746 if (plist == NULL) 3747 return; 3748 3749 SystemProperty* new_p = new SystemProperty(k, v, true); 3750 PropertyList_add(plist, new_p); 3751 } 3752 3753 // This add maintains unique property key in the list. 3754 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3755 if (plist == NULL) 3756 return; 3757 3758 // If property key exist then update with new value. 3759 SystemProperty* prop; 3760 for (prop = *plist; prop != NULL; prop = prop->next()) { 3761 if (strcmp(k, prop->key()) == 0) { 3762 if (append) { 3763 prop->append_value(v); 3764 } else { 3765 prop->set_value(v); 3766 } 3767 return; 3768 } 3769 } 3770 3771 PropertyList_add(plist, k, v); 3772 } 3773 3774 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3775 // Returns true if all of the source pointed by src has been copied over to 3776 // the destination buffer pointed by buf. Otherwise, returns false. 3777 // Notes: 3778 // 1. If the length (buflen) of the destination buffer excluding the 3779 // NULL terminator character is not long enough for holding the expanded 3780 // pid characters, it also returns false instead of returning the partially 3781 // expanded one. 3782 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3783 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3784 char* buf, size_t buflen) { 3785 const char* p = src; 3786 char* b = buf; 3787 const char* src_end = &src[srclen]; 3788 char* buf_end = &buf[buflen - 1]; 3789 3790 while (p < src_end && b < buf_end) { 3791 if (*p == '%') { 3792 switch (*(++p)) { 3793 case '%': // "%%" ==> "%" 3794 *b++ = *p++; 3795 break; 3796 case 'p': { // "%p" ==> current process id 3797 // buf_end points to the character before the last character so 3798 // that we could write '\0' to the end of the buffer. 3799 size_t buf_sz = buf_end - b + 1; 3800 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3801 3802 // if jio_snprintf fails or the buffer is not long enough to hold 3803 // the expanded pid, returns false. 3804 if (ret < 0 || ret >= (int)buf_sz) { 3805 return false; 3806 } else { 3807 b += ret; 3808 assert(*b == '\0', "fail in copy_expand_pid"); 3809 if (p == src_end && b == buf_end + 1) { 3810 // reach the end of the buffer. 3811 return true; 3812 } 3813 } 3814 p++; 3815 break; 3816 } 3817 default : 3818 *b++ = '%'; 3819 } 3820 } else { 3821 *b++ = *p++; 3822 } 3823 } 3824 *b = '\0'; 3825 return (p == src_end); // return false if not all of the source was copied 3826 }