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/genCollectedHeap.hpp" 32 #include "memory/referenceProcessor.hpp" 33 #include "memory/universe.inline.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "prims/jvmtiExport.hpp" 36 #include "runtime/arguments.hpp" 37 #include "runtime/globals_extension.hpp" 38 #include "runtime/java.hpp" 39 #include "services/management.hpp" 40 #include "services/memTracker.hpp" 41 #include "utilities/defaultStream.hpp" 42 #include "utilities/macros.hpp" 43 #include "utilities/taskqueue.hpp" 44 #ifdef TARGET_OS_FAMILY_linux 45 # include "os_linux.inline.hpp" 46 #endif 47 #ifdef TARGET_OS_FAMILY_solaris 48 # include "os_solaris.inline.hpp" 49 #endif 50 #ifdef TARGET_OS_FAMILY_windows 51 # include "os_windows.inline.hpp" 52 #endif 53 #ifdef TARGET_OS_FAMILY_bsd 54 # include "os_bsd.inline.hpp" 55 #endif 56 #if INCLUDE_ALL_GCS 57 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 58 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 59 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 60 #endif // INCLUDE_ALL_GCS 61 62 // Note: This is a special bug reporting site for the JVM 63 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 64 #define DEFAULT_JAVA_LAUNCHER "generic" 65 66 // Disable options not supported in this release, with a warning if they 67 // were explicitly requested on the command-line 68 #define UNSUPPORTED_OPTION(opt, description) \ 69 do { \ 70 if (opt) { \ 71 if (FLAG_IS_CMDLINE(opt)) { \ 72 warning(description " is disabled in this release."); \ 73 } \ 74 FLAG_SET_DEFAULT(opt, false); \ 75 } \ 76 } while(0) 77 78 #define UNSUPPORTED_GC_OPTION(gc) \ 79 do { \ 80 if (gc) { \ 81 if (FLAG_IS_CMDLINE(gc)) { \ 82 warning(#gc " is not supported in this VM. Using Serial GC."); \ 83 } \ 84 FLAG_SET_DEFAULT(gc, false); \ 85 } \ 86 } while(0) 87 88 char** Arguments::_jvm_flags_array = NULL; 89 int Arguments::_num_jvm_flags = 0; 90 char** Arguments::_jvm_args_array = NULL; 91 int Arguments::_num_jvm_args = 0; 92 char* Arguments::_java_command = NULL; 93 SystemProperty* Arguments::_system_properties = NULL; 94 const char* Arguments::_gc_log_filename = NULL; 95 bool Arguments::_has_profile = false; 96 size_t Arguments::_conservative_max_heap_alignment = 0; 97 uintx Arguments::_min_heap_size = 0; 98 Arguments::Mode Arguments::_mode = _mixed; 99 bool Arguments::_java_compiler = false; 100 bool Arguments::_xdebug_mode = false; 101 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 102 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 103 int Arguments::_sun_java_launcher_pid = -1; 104 bool Arguments::_created_by_gamma_launcher = false; 105 106 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 107 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 108 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 109 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 110 bool Arguments::_ClipInlining = ClipInlining; 111 112 char* Arguments::SharedArchivePath = NULL; 113 114 AgentLibraryList Arguments::_libraryList; 115 AgentLibraryList Arguments::_agentList; 116 117 abort_hook_t Arguments::_abort_hook = NULL; 118 exit_hook_t Arguments::_exit_hook = NULL; 119 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 120 121 122 SystemProperty *Arguments::_java_ext_dirs = NULL; 123 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 124 SystemProperty *Arguments::_sun_boot_library_path = NULL; 125 SystemProperty *Arguments::_java_library_path = NULL; 126 SystemProperty *Arguments::_java_home = NULL; 127 SystemProperty *Arguments::_java_class_path = NULL; 128 SystemProperty *Arguments::_sun_boot_class_path = NULL; 129 130 char* Arguments::_meta_index_path = NULL; 131 char* Arguments::_meta_index_dir = NULL; 132 133 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 134 135 static bool match_option(const JavaVMOption *option, const char* name, 136 const char** tail) { 137 int len = (int)strlen(name); 138 if (strncmp(option->optionString, name, len) == 0) { 139 *tail = option->optionString + len; 140 return true; 141 } else { 142 return false; 143 } 144 } 145 146 static void logOption(const char* opt) { 147 if (PrintVMOptions) { 148 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 149 } 150 } 151 152 // Process java launcher properties. 153 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 154 // See if sun.java.launcher or sun.java.launcher.pid is defined. 155 // Must do this before setting up other system properties, 156 // as some of them may depend on launcher type. 157 for (int index = 0; index < args->nOptions; index++) { 158 const JavaVMOption* option = args->options + index; 159 const char* tail; 160 161 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 162 process_java_launcher_argument(tail, option->extraInfo); 163 continue; 164 } 165 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 166 _sun_java_launcher_pid = atoi(tail); 167 continue; 168 } 169 } 170 } 171 172 // Initialize system properties key and value. 173 void Arguments::init_system_properties() { 174 175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 176 "Java Virtual Machine Specification", false)); 177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 179 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 180 181 // following are JVMTI agent writeable properties. 182 // Properties values are set to NULL and they are 183 // os specific they are initialized in os::init_system_properties_values(). 184 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 185 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 186 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 187 _java_library_path = new SystemProperty("java.library.path", NULL, true); 188 _java_home = new SystemProperty("java.home", NULL, true); 189 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 190 191 _java_class_path = new SystemProperty("java.class.path", "", true); 192 193 // Add to System Property list. 194 PropertyList_add(&_system_properties, _java_ext_dirs); 195 PropertyList_add(&_system_properties, _java_endorsed_dirs); 196 PropertyList_add(&_system_properties, _sun_boot_library_path); 197 PropertyList_add(&_system_properties, _java_library_path); 198 PropertyList_add(&_system_properties, _java_home); 199 PropertyList_add(&_system_properties, _java_class_path); 200 PropertyList_add(&_system_properties, _sun_boot_class_path); 201 202 // Set OS specific system properties values 203 os::init_system_properties_values(); 204 } 205 206 207 // Update/Initialize System properties after JDK version number is known 208 void Arguments::init_version_specific_system_properties() { 209 enum { bufsz = 16 }; 210 char buffer[bufsz]; 211 const char* spec_vendor = "Sun Microsystems Inc."; 212 uint32_t spec_version = 0; 213 214 if (JDK_Version::is_gte_jdk17x_version()) { 215 spec_vendor = "Oracle Corporation"; 216 spec_version = JDK_Version::current().major_version(); 217 } 218 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 219 220 PropertyList_add(&_system_properties, 221 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 222 PropertyList_add(&_system_properties, 223 new SystemProperty("java.vm.specification.version", buffer, false)); 224 PropertyList_add(&_system_properties, 225 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 226 } 227 228 /** 229 * Provide a slightly more user-friendly way of eliminating -XX flags. 230 * When a flag is eliminated, it can be added to this list in order to 231 * continue accepting this flag on the command-line, while issuing a warning 232 * and ignoring the value. Once the JDK version reaches the 'accept_until' 233 * limit, we flatly refuse to admit the existence of the flag. This allows 234 * a flag to die correctly over JDK releases using HSX. 235 */ 236 typedef struct { 237 const char* name; 238 JDK_Version obsoleted_in; // when the flag went away 239 JDK_Version accept_until; // which version to start denying the existence 240 } ObsoleteFlag; 241 242 static ObsoleteFlag obsolete_jvm_flags[] = { 243 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 244 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 245 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 246 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 257 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 258 { "DefaultInitialRAMFraction", 259 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 260 { "UseDepthFirstScavengeOrder", 261 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 262 { "HandlePromotionFailure", 263 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 264 { "MaxLiveObjectEvacuationRatio", 265 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 266 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 267 { "UseParallelOldGCCompacting", 268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 269 { "UseParallelDensePrefixUpdate", 270 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 271 { "UseParallelOldGCDensePrefix", 272 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 273 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 274 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 275 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 276 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 277 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 278 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 #ifdef PRODUCT 294 { "DesiredMethodLimit", 295 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 296 #endif // PRODUCT 297 { NULL, JDK_Version(0), JDK_Version(0) } 298 }; 299 300 // Returns true if the flag is obsolete and fits into the range specified 301 // for being ignored. In the case that the flag is ignored, the 'version' 302 // value is filled in with the version number when the flag became 303 // obsolete so that that value can be displayed to the user. 304 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 305 int i = 0; 306 assert(version != NULL, "Must provide a version buffer"); 307 while (obsolete_jvm_flags[i].name != NULL) { 308 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 309 // <flag>=xxx form 310 // [-|+]<flag> form 311 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 312 ((s[0] == '+' || s[0] == '-') && 313 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 314 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 315 *version = flag_status.obsoleted_in; 316 return true; 317 } 318 } 319 i++; 320 } 321 return false; 322 } 323 324 // Constructs the system class path (aka boot class path) from the following 325 // components, in order: 326 // 327 // prefix // from -Xbootclasspath/p:... 328 // endorsed // the expansion of -Djava.endorsed.dirs=... 329 // base // from os::get_system_properties() or -Xbootclasspath= 330 // suffix // from -Xbootclasspath/a:... 331 // 332 // java.endorsed.dirs is a list of directories; any jar or zip files in the 333 // directories are added to the sysclasspath just before the base. 334 // 335 // This could be AllStatic, but it isn't needed after argument processing is 336 // complete. 337 class SysClassPath: public StackObj { 338 public: 339 SysClassPath(const char* base); 340 ~SysClassPath(); 341 342 inline void set_base(const char* base); 343 inline void add_prefix(const char* prefix); 344 inline void add_suffix_to_prefix(const char* suffix); 345 inline void add_suffix(const char* suffix); 346 inline void reset_path(const char* base); 347 348 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 349 // property. Must be called after all command-line arguments have been 350 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 351 // combined_path(). 352 void expand_endorsed(); 353 354 inline const char* get_base() const { return _items[_scp_base]; } 355 inline const char* get_prefix() const { return _items[_scp_prefix]; } 356 inline const char* get_suffix() const { return _items[_scp_suffix]; } 357 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 358 359 // Combine all the components into a single c-heap-allocated string; caller 360 // must free the string if/when no longer needed. 361 char* combined_path(); 362 363 private: 364 // Utility routines. 365 static char* add_to_path(const char* path, const char* str, bool prepend); 366 static char* add_jars_to_path(char* path, const char* directory); 367 368 inline void reset_item_at(int index); 369 370 // Array indices for the items that make up the sysclasspath. All except the 371 // base are allocated in the C heap and freed by this class. 372 enum { 373 _scp_prefix, // from -Xbootclasspath/p:... 374 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 375 _scp_base, // the default sysclasspath 376 _scp_suffix, // from -Xbootclasspath/a:... 377 _scp_nitems // the number of items, must be last. 378 }; 379 380 const char* _items[_scp_nitems]; 381 DEBUG_ONLY(bool _expansion_done;) 382 }; 383 384 SysClassPath::SysClassPath(const char* base) { 385 memset(_items, 0, sizeof(_items)); 386 _items[_scp_base] = base; 387 DEBUG_ONLY(_expansion_done = false;) 388 } 389 390 SysClassPath::~SysClassPath() { 391 // Free everything except the base. 392 for (int i = 0; i < _scp_nitems; ++i) { 393 if (i != _scp_base) reset_item_at(i); 394 } 395 DEBUG_ONLY(_expansion_done = false;) 396 } 397 398 inline void SysClassPath::set_base(const char* base) { 399 _items[_scp_base] = base; 400 } 401 402 inline void SysClassPath::add_prefix(const char* prefix) { 403 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 404 } 405 406 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 407 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 408 } 409 410 inline void SysClassPath::add_suffix(const char* suffix) { 411 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 412 } 413 414 inline void SysClassPath::reset_item_at(int index) { 415 assert(index < _scp_nitems && index != _scp_base, "just checking"); 416 if (_items[index] != NULL) { 417 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 418 _items[index] = NULL; 419 } 420 } 421 422 inline void SysClassPath::reset_path(const char* base) { 423 // Clear the prefix and suffix. 424 reset_item_at(_scp_prefix); 425 reset_item_at(_scp_suffix); 426 set_base(base); 427 } 428 429 //------------------------------------------------------------------------------ 430 431 void SysClassPath::expand_endorsed() { 432 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 433 434 const char* path = Arguments::get_property("java.endorsed.dirs"); 435 if (path == NULL) { 436 path = Arguments::get_endorsed_dir(); 437 assert(path != NULL, "no default for java.endorsed.dirs"); 438 } 439 440 char* expanded_path = NULL; 441 const char separator = *os::path_separator(); 442 const char* const end = path + strlen(path); 443 while (path < end) { 444 const char* tmp_end = strchr(path, separator); 445 if (tmp_end == NULL) { 446 expanded_path = add_jars_to_path(expanded_path, path); 447 path = end; 448 } else { 449 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 450 memcpy(dirpath, path, tmp_end - path); 451 dirpath[tmp_end - path] = '\0'; 452 expanded_path = add_jars_to_path(expanded_path, dirpath); 453 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 454 path = tmp_end + 1; 455 } 456 } 457 _items[_scp_endorsed] = expanded_path; 458 DEBUG_ONLY(_expansion_done = true;) 459 } 460 461 // Combine the bootclasspath elements, some of which may be null, into a single 462 // c-heap-allocated string. 463 char* SysClassPath::combined_path() { 464 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 465 assert(_expansion_done, "must call expand_endorsed() first."); 466 467 size_t lengths[_scp_nitems]; 468 size_t total_len = 0; 469 470 const char separator = *os::path_separator(); 471 472 // Get the lengths. 473 int i; 474 for (i = 0; i < _scp_nitems; ++i) { 475 if (_items[i] != NULL) { 476 lengths[i] = strlen(_items[i]); 477 // Include space for the separator char (or a NULL for the last item). 478 total_len += lengths[i] + 1; 479 } 480 } 481 assert(total_len > 0, "empty sysclasspath not allowed"); 482 483 // Copy the _items to a single string. 484 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 485 char* cp_tmp = cp; 486 for (i = 0; i < _scp_nitems; ++i) { 487 if (_items[i] != NULL) { 488 memcpy(cp_tmp, _items[i], lengths[i]); 489 cp_tmp += lengths[i]; 490 *cp_tmp++ = separator; 491 } 492 } 493 *--cp_tmp = '\0'; // Replace the extra separator. 494 return cp; 495 } 496 497 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 498 char* 499 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 500 char *cp; 501 502 assert(str != NULL, "just checking"); 503 if (path == NULL) { 504 size_t len = strlen(str) + 1; 505 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 506 memcpy(cp, str, len); // copy the trailing null 507 } else { 508 const char separator = *os::path_separator(); 509 size_t old_len = strlen(path); 510 size_t str_len = strlen(str); 511 size_t len = old_len + str_len + 2; 512 513 if (prepend) { 514 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 515 char* cp_tmp = cp; 516 memcpy(cp_tmp, str, str_len); 517 cp_tmp += str_len; 518 *cp_tmp = separator; 519 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 520 FREE_C_HEAP_ARRAY(char, path, mtInternal); 521 } else { 522 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 523 char* cp_tmp = cp + old_len; 524 *cp_tmp = separator; 525 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 526 } 527 } 528 return cp; 529 } 530 531 // Scan the directory and append any jar or zip files found to path. 532 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 533 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 534 DIR* dir = os::opendir(directory); 535 if (dir == NULL) return path; 536 537 char dir_sep[2] = { '\0', '\0' }; 538 size_t directory_len = strlen(directory); 539 const char fileSep = *os::file_separator(); 540 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 541 542 /* Scan the directory for jars/zips, appending them to path. */ 543 struct dirent *entry; 544 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 545 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 546 const char* name = entry->d_name; 547 const char* ext = name + strlen(name) - 4; 548 bool isJarOrZip = ext > name && 549 (os::file_name_strcmp(ext, ".jar") == 0 || 550 os::file_name_strcmp(ext, ".zip") == 0); 551 if (isJarOrZip) { 552 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 553 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 554 path = add_to_path(path, jarpath, false); 555 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 556 } 557 } 558 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 559 os::closedir(dir); 560 return path; 561 } 562 563 // Parses a memory size specification string. 564 static bool atomull(const char *s, julong* result) { 565 julong n = 0; 566 int args_read = sscanf(s, JULONG_FORMAT, &n); 567 if (args_read != 1) { 568 return false; 569 } 570 while (*s != '\0' && isdigit(*s)) { 571 s++; 572 } 573 // 4705540: illegal if more characters are found after the first non-digit 574 if (strlen(s) > 1) { 575 return false; 576 } 577 switch (*s) { 578 case 'T': case 't': 579 *result = n * G * K; 580 // Check for overflow. 581 if (*result/((julong)G * K) != n) return false; 582 return true; 583 case 'G': case 'g': 584 *result = n * G; 585 if (*result/G != n) return false; 586 return true; 587 case 'M': case 'm': 588 *result = n * M; 589 if (*result/M != n) return false; 590 return true; 591 case 'K': case 'k': 592 *result = n * K; 593 if (*result/K != n) return false; 594 return true; 595 case '\0': 596 *result = n; 597 return true; 598 default: 599 return false; 600 } 601 } 602 603 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 604 if (size < min_size) return arg_too_small; 605 // Check that size will fit in a size_t (only relevant on 32-bit) 606 if (size > max_uintx) return arg_too_big; 607 return arg_in_range; 608 } 609 610 // Describe an argument out of range error 611 void Arguments::describe_range_error(ArgsRange errcode) { 612 switch(errcode) { 613 case arg_too_big: 614 jio_fprintf(defaultStream::error_stream(), 615 "The specified size exceeds the maximum " 616 "representable size.\n"); 617 break; 618 case arg_too_small: 619 case arg_unreadable: 620 case arg_in_range: 621 // do nothing for now 622 break; 623 default: 624 ShouldNotReachHere(); 625 } 626 } 627 628 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 629 return CommandLineFlags::boolAtPut(name, &value, origin); 630 } 631 632 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 633 double v; 634 if (sscanf(value, "%lf", &v) != 1) { 635 return false; 636 } 637 638 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 639 return true; 640 } 641 return false; 642 } 643 644 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 645 julong v; 646 intx intx_v; 647 bool is_neg = false; 648 // Check the sign first since atomull() parses only unsigned values. 649 if (*value == '-') { 650 if (!CommandLineFlags::intxAt(name, &intx_v)) { 651 return false; 652 } 653 value++; 654 is_neg = true; 655 } 656 if (!atomull(value, &v)) { 657 return false; 658 } 659 intx_v = (intx) v; 660 if (is_neg) { 661 intx_v = -intx_v; 662 } 663 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 664 return true; 665 } 666 uintx uintx_v = (uintx) v; 667 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 668 return true; 669 } 670 uint64_t uint64_t_v = (uint64_t) v; 671 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 672 return true; 673 } 674 return false; 675 } 676 677 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 678 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 679 // Contract: CommandLineFlags always returns a pointer that needs freeing. 680 FREE_C_HEAP_ARRAY(char, value, mtInternal); 681 return true; 682 } 683 684 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 685 const char* old_value = ""; 686 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 687 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 688 size_t new_len = strlen(new_value); 689 const char* value; 690 char* free_this_too = NULL; 691 if (old_len == 0) { 692 value = new_value; 693 } else if (new_len == 0) { 694 value = old_value; 695 } else { 696 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 697 // each new setting adds another LINE to the switch: 698 sprintf(buf, "%s\n%s", old_value, new_value); 699 value = buf; 700 free_this_too = buf; 701 } 702 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 703 // CommandLineFlags always returns a pointer that needs freeing. 704 FREE_C_HEAP_ARRAY(char, value, mtInternal); 705 if (free_this_too != NULL) { 706 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 707 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 708 } 709 return true; 710 } 711 712 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 713 714 // range of acceptable characters spelled out for portability reasons 715 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 716 #define BUFLEN 255 717 char name[BUFLEN+1]; 718 char dummy; 719 720 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 721 return set_bool_flag(name, false, origin); 722 } 723 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 724 return set_bool_flag(name, true, origin); 725 } 726 727 char punct; 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 729 const char* value = strchr(arg, '=') + 1; 730 Flag* flag = Flag::find_flag(name, strlen(name)); 731 if (flag != NULL && flag->is_ccstr()) { 732 if (flag->ccstr_accumulates()) { 733 return append_to_string_flag(name, value, origin); 734 } else { 735 if (value[0] == '\0') { 736 value = NULL; 737 } 738 return set_string_flag(name, value, origin); 739 } 740 } 741 } 742 743 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 744 const char* value = strchr(arg, '=') + 1; 745 // -XX:Foo:=xxx will reset the string flag to the given value. 746 if (value[0] == '\0') { 747 value = NULL; 748 } 749 return set_string_flag(name, value, origin); 750 } 751 752 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 753 #define SIGNED_NUMBER_RANGE "[-0123456789]" 754 #define NUMBER_RANGE "[0123456789]" 755 char value[BUFLEN + 1]; 756 char value2[BUFLEN + 1]; 757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 758 // Looks like a floating-point number -- try again with more lenient format string 759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 760 return set_fp_numeric_flag(name, value, origin); 761 } 762 } 763 764 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 765 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 766 return set_numeric_flag(name, value, origin); 767 } 768 769 return false; 770 } 771 772 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 773 assert(bldarray != NULL, "illegal argument"); 774 775 if (arg == NULL) { 776 return; 777 } 778 779 int new_count = *count + 1; 780 781 // expand the array and add arg to the last element 782 if (*bldarray == NULL) { 783 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 784 } else { 785 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 786 } 787 (*bldarray)[*count] = strdup(arg); 788 *count = new_count; 789 } 790 791 void Arguments::build_jvm_args(const char* arg) { 792 add_string(&_jvm_args_array, &_num_jvm_args, arg); 793 } 794 795 void Arguments::build_jvm_flags(const char* arg) { 796 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 797 } 798 799 // utility function to return a string that concatenates all 800 // strings in a given char** array 801 const char* Arguments::build_resource_string(char** args, int count) { 802 if (args == NULL || count == 0) { 803 return NULL; 804 } 805 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 806 for (int i = 1; i < count; i++) { 807 length += strlen(args[i]) + 1; // add 1 for a space 808 } 809 char* s = NEW_RESOURCE_ARRAY(char, length); 810 strcpy(s, args[0]); 811 for (int j = 1; j < count; j++) { 812 strcat(s, " "); 813 strcat(s, args[j]); 814 } 815 return (const char*) s; 816 } 817 818 void Arguments::print_on(outputStream* st) { 819 st->print_cr("VM Arguments:"); 820 if (num_jvm_flags() > 0) { 821 st->print("jvm_flags: "); print_jvm_flags_on(st); 822 } 823 if (num_jvm_args() > 0) { 824 st->print("jvm_args: "); print_jvm_args_on(st); 825 } 826 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 827 if (_java_class_path != NULL) { 828 char* path = _java_class_path->value(); 829 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 830 } 831 st->print_cr("Launcher Type: %s", _sun_java_launcher); 832 } 833 834 void Arguments::print_jvm_flags_on(outputStream* st) { 835 if (_num_jvm_flags > 0) { 836 for (int i=0; i < _num_jvm_flags; i++) { 837 st->print("%s ", _jvm_flags_array[i]); 838 } 839 st->print_cr(""); 840 } 841 } 842 843 void Arguments::print_jvm_args_on(outputStream* st) { 844 if (_num_jvm_args > 0) { 845 for (int i=0; i < _num_jvm_args; i++) { 846 st->print("%s ", _jvm_args_array[i]); 847 } 848 st->print_cr(""); 849 } 850 } 851 852 bool Arguments::process_argument(const char* arg, 853 jboolean ignore_unrecognized, Flag::Flags origin) { 854 855 JDK_Version since = JDK_Version(); 856 857 if (parse_argument(arg, origin) || ignore_unrecognized) { 858 return true; 859 } 860 861 bool has_plus_minus = (*arg == '+' || *arg == '-'); 862 const char* const argname = has_plus_minus ? arg + 1 : arg; 863 if (is_newly_obsolete(arg, &since)) { 864 char version[256]; 865 since.to_string(version, sizeof(version)); 866 warning("ignoring option %s; support was removed in %s", argname, version); 867 return true; 868 } 869 870 // For locked flags, report a custom error message if available. 871 // Otherwise, report the standard unrecognized VM option. 872 873 size_t arg_len; 874 const char* equal_sign = strchr(argname, '='); 875 if (equal_sign == NULL) { 876 arg_len = strlen(argname); 877 } else { 878 arg_len = equal_sign - argname; 879 } 880 881 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true); 882 if (found_flag != NULL) { 883 char locked_message_buf[BUFLEN]; 884 found_flag->get_locked_message(locked_message_buf, BUFLEN); 885 if (strlen(locked_message_buf) == 0) { 886 if (found_flag->is_bool() && !has_plus_minus) { 887 jio_fprintf(defaultStream::error_stream(), 888 "Missing +/- setting for VM option '%s'\n", argname); 889 } else if (!found_flag->is_bool() && has_plus_minus) { 890 jio_fprintf(defaultStream::error_stream(), 891 "Unexpected +/- setting in VM option '%s'\n", argname); 892 } else { 893 jio_fprintf(defaultStream::error_stream(), 894 "Improperly specified VM option '%s'\n", argname); 895 } 896 } else { 897 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 898 } 899 } else { 900 jio_fprintf(defaultStream::error_stream(), 901 "Unrecognized VM option '%s'\n", argname); 902 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 903 if (fuzzy_matched != NULL) { 904 jio_fprintf(defaultStream::error_stream(), 905 "Did you mean '%s%s%s'?\n", 906 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 907 fuzzy_matched->_name, 908 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 909 } 910 } 911 912 // allow for commandline "commenting out" options like -XX:#+Verbose 913 return arg[0] == '#'; 914 } 915 916 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 917 FILE* stream = fopen(file_name, "rb"); 918 if (stream == NULL) { 919 if (should_exist) { 920 jio_fprintf(defaultStream::error_stream(), 921 "Could not open settings file %s\n", file_name); 922 return false; 923 } else { 924 return true; 925 } 926 } 927 928 char token[1024]; 929 int pos = 0; 930 931 bool in_white_space = true; 932 bool in_comment = false; 933 bool in_quote = false; 934 char quote_c = 0; 935 bool result = true; 936 937 int c = getc(stream); 938 while(c != EOF && pos < (int)(sizeof(token)-1)) { 939 if (in_white_space) { 940 if (in_comment) { 941 if (c == '\n') in_comment = false; 942 } else { 943 if (c == '#') in_comment = true; 944 else if (!isspace(c)) { 945 in_white_space = false; 946 token[pos++] = c; 947 } 948 } 949 } else { 950 if (c == '\n' || (!in_quote && isspace(c))) { 951 // token ends at newline, or at unquoted whitespace 952 // this allows a way to include spaces in string-valued options 953 token[pos] = '\0'; 954 logOption(token); 955 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 956 build_jvm_flags(token); 957 pos = 0; 958 in_white_space = true; 959 in_quote = false; 960 } else if (!in_quote && (c == '\'' || c == '"')) { 961 in_quote = true; 962 quote_c = c; 963 } else if (in_quote && (c == quote_c)) { 964 in_quote = false; 965 } else { 966 token[pos++] = c; 967 } 968 } 969 c = getc(stream); 970 } 971 if (pos > 0) { 972 token[pos] = '\0'; 973 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 974 build_jvm_flags(token); 975 } 976 fclose(stream); 977 return result; 978 } 979 980 //============================================================================================================= 981 // Parsing of properties (-D) 982 983 const char* Arguments::get_property(const char* key) { 984 return PropertyList_get_value(system_properties(), key); 985 } 986 987 bool Arguments::add_property(const char* prop) { 988 const char* eq = strchr(prop, '='); 989 char* key; 990 // ns must be static--its address may be stored in a SystemProperty object. 991 const static char ns[1] = {0}; 992 char* value = (char *)ns; 993 994 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 995 key = AllocateHeap(key_len + 1, mtInternal); 996 strncpy(key, prop, key_len); 997 key[key_len] = '\0'; 998 999 if (eq != NULL) { 1000 size_t value_len = strlen(prop) - key_len - 1; 1001 value = AllocateHeap(value_len + 1, mtInternal); 1002 strncpy(value, &prop[key_len + 1], value_len + 1); 1003 } 1004 1005 if (strcmp(key, "java.compiler") == 0) { 1006 process_java_compiler_argument(value); 1007 FreeHeap(key); 1008 if (eq != NULL) { 1009 FreeHeap(value); 1010 } 1011 return true; 1012 } else if (strcmp(key, "sun.java.command") == 0) { 1013 _java_command = value; 1014 1015 // Record value in Arguments, but let it get passed to Java. 1016 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 1017 // launcher.pid property is private and is processed 1018 // in process_sun_java_launcher_properties(); 1019 // the sun.java.launcher property is passed on to the java application 1020 FreeHeap(key); 1021 if (eq != NULL) { 1022 FreeHeap(value); 1023 } 1024 return true; 1025 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1026 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1027 // its value without going through the property list or making a Java call. 1028 _java_vendor_url_bug = value; 1029 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1030 PropertyList_unique_add(&_system_properties, key, value, true); 1031 return true; 1032 } 1033 // Create new property and add at the end of the list 1034 PropertyList_unique_add(&_system_properties, key, value); 1035 return true; 1036 } 1037 1038 //=========================================================================================================== 1039 // Setting int/mixed/comp mode flags 1040 1041 void Arguments::set_mode_flags(Mode mode) { 1042 // Set up default values for all flags. 1043 // If you add a flag to any of the branches below, 1044 // add a default value for it here. 1045 set_java_compiler(false); 1046 _mode = mode; 1047 1048 // Ensure Agent_OnLoad has the correct initial values. 1049 // This may not be the final mode; mode may change later in onload phase. 1050 PropertyList_unique_add(&_system_properties, "java.vm.info", 1051 (char*)VM_Version::vm_info_string(), false); 1052 1053 UseInterpreter = true; 1054 UseCompiler = true; 1055 UseLoopCounter = true; 1056 1057 #ifndef ZERO 1058 // Turn these off for mixed and comp. Leave them on for Zero. 1059 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1060 UseFastAccessorMethods = (mode == _int); 1061 } 1062 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1063 UseFastEmptyMethods = (mode == _int); 1064 } 1065 #endif 1066 1067 // Default values may be platform/compiler dependent - 1068 // use the saved values 1069 ClipInlining = Arguments::_ClipInlining; 1070 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1071 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1072 BackgroundCompilation = Arguments::_BackgroundCompilation; 1073 1074 // Change from defaults based on mode 1075 switch (mode) { 1076 default: 1077 ShouldNotReachHere(); 1078 break; 1079 case _int: 1080 UseCompiler = false; 1081 UseLoopCounter = false; 1082 AlwaysCompileLoopMethods = false; 1083 UseOnStackReplacement = false; 1084 break; 1085 case _mixed: 1086 // same as default 1087 break; 1088 case _comp: 1089 UseInterpreter = false; 1090 BackgroundCompilation = false; 1091 ClipInlining = false; 1092 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1093 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1094 // compile a level 4 (C2) and then continue executing it. 1095 if (TieredCompilation) { 1096 Tier3InvokeNotifyFreqLog = 0; 1097 Tier4InvocationThreshold = 0; 1098 } 1099 break; 1100 } 1101 } 1102 1103 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1104 // Conflict: required to use shared spaces (-Xshare:on), but 1105 // incompatible command line options were chosen. 1106 1107 static void no_shared_spaces() { 1108 if (RequireSharedSpaces) { 1109 jio_fprintf(defaultStream::error_stream(), 1110 "Class data sharing is inconsistent with other specified options.\n"); 1111 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1112 } else { 1113 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1114 } 1115 } 1116 #endif 1117 1118 void Arguments::set_tiered_flags() { 1119 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1120 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1121 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1122 } 1123 if (CompilationPolicyChoice < 2) { 1124 vm_exit_during_initialization( 1125 "Incompatible compilation policy selected", NULL); 1126 } 1127 // Increase the code cache size - tiered compiles a lot more. 1128 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1129 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1130 } 1131 if (!UseInterpreter) { // -Xcomp 1132 Tier3InvokeNotifyFreqLog = 0; 1133 Tier4InvocationThreshold = 0; 1134 } 1135 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 1136 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 1137 } 1138 } 1139 1140 #if INCLUDE_ALL_GCS 1141 static void disable_adaptive_size_policy(const char* collector_name) { 1142 if (UseAdaptiveSizePolicy) { 1143 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1144 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1145 collector_name); 1146 } 1147 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1148 } 1149 } 1150 1151 void Arguments::set_parnew_gc_flags() { 1152 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1153 "control point invariant"); 1154 assert(UseParNewGC, "Error"); 1155 1156 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1157 disable_adaptive_size_policy("UseParNewGC"); 1158 1159 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1160 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1161 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1162 } else if (ParallelGCThreads == 0) { 1163 jio_fprintf(defaultStream::error_stream(), 1164 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1165 vm_exit(1); 1166 } 1167 1168 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1169 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1170 // we set them to 1024 and 1024. 1171 // See CR 6362902. 1172 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1173 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1174 } 1175 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1176 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1177 } 1178 1179 // AlwaysTenure flag should make ParNew promote all at first collection. 1180 // See CR 6362902. 1181 if (AlwaysTenure) { 1182 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1183 } 1184 // When using compressed oops, we use local overflow stacks, 1185 // rather than using a global overflow list chained through 1186 // the klass word of the object's pre-image. 1187 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1188 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1189 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1190 } 1191 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1192 } 1193 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1194 } 1195 1196 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1197 // sparc/solaris for certain applications, but would gain from 1198 // further optimization and tuning efforts, and would almost 1199 // certainly gain from analysis of platform and environment. 1200 void Arguments::set_cms_and_parnew_gc_flags() { 1201 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1202 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1203 1204 // If we are using CMS, we prefer to UseParNewGC, 1205 // unless explicitly forbidden. 1206 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1207 FLAG_SET_ERGO(bool, UseParNewGC, true); 1208 } 1209 1210 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1211 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1212 1213 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1214 // as needed. 1215 if (UseParNewGC) { 1216 set_parnew_gc_flags(); 1217 } 1218 1219 size_t max_heap = align_size_down(MaxHeapSize, 1220 CardTableRS::ct_max_alignment_constraint()); 1221 1222 // Now make adjustments for CMS 1223 intx tenuring_default = (intx)6; 1224 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1225 1226 // Preferred young gen size for "short" pauses: 1227 // upper bound depends on # of threads and NewRatio. 1228 const uintx parallel_gc_threads = 1229 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1230 const size_t preferred_max_new_size_unaligned = 1231 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1232 size_t preferred_max_new_size = 1233 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1234 1235 // Unless explicitly requested otherwise, size young gen 1236 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1237 1238 // If either MaxNewSize or NewRatio is set on the command line, 1239 // assume the user is trying to set the size of the young gen. 1240 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1241 1242 // Set MaxNewSize to our calculated preferred_max_new_size unless 1243 // NewSize was set on the command line and it is larger than 1244 // preferred_max_new_size. 1245 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1246 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1247 } else { 1248 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1249 } 1250 if (PrintGCDetails && Verbose) { 1251 // Too early to use gclog_or_tty 1252 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1253 } 1254 1255 // Code along this path potentially sets NewSize and OldSize 1256 if (PrintGCDetails && Verbose) { 1257 // Too early to use gclog_or_tty 1258 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1259 " initial_heap_size: " SIZE_FORMAT 1260 " max_heap: " SIZE_FORMAT, 1261 min_heap_size(), InitialHeapSize, max_heap); 1262 } 1263 size_t min_new = preferred_max_new_size; 1264 if (FLAG_IS_CMDLINE(NewSize)) { 1265 min_new = NewSize; 1266 } 1267 if (max_heap > min_new && min_heap_size() > min_new) { 1268 // Unless explicitly requested otherwise, make young gen 1269 // at least min_new, and at most preferred_max_new_size. 1270 if (FLAG_IS_DEFAULT(NewSize)) { 1271 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1272 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1273 if (PrintGCDetails && Verbose) { 1274 // Too early to use gclog_or_tty 1275 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1276 } 1277 } 1278 // Unless explicitly requested otherwise, size old gen 1279 // so it's NewRatio x of NewSize. 1280 if (FLAG_IS_DEFAULT(OldSize)) { 1281 if (max_heap > NewSize) { 1282 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1283 if (PrintGCDetails && Verbose) { 1284 // Too early to use gclog_or_tty 1285 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1286 } 1287 } 1288 } 1289 } 1290 } 1291 // Unless explicitly requested otherwise, definitely 1292 // promote all objects surviving "tenuring_default" scavenges. 1293 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1294 FLAG_IS_DEFAULT(SurvivorRatio)) { 1295 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1296 } 1297 // If we decided above (or user explicitly requested) 1298 // `promote all' (via MaxTenuringThreshold := 0), 1299 // prefer minuscule survivor spaces so as not to waste 1300 // space for (non-existent) survivors 1301 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1302 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1303 } 1304 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1305 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1306 // This is done in order to make ParNew+CMS configuration to work 1307 // with YoungPLABSize and OldPLABSize options. 1308 // See CR 6362902. 1309 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1310 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1311 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1312 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1313 // the value (either from the command line or ergonomics) of 1314 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1315 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1316 } else { 1317 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1318 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1319 // we'll let it to take precedence. 1320 jio_fprintf(defaultStream::error_stream(), 1321 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1322 " options are specified for the CMS collector." 1323 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1324 } 1325 } 1326 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1327 // OldPLAB sizing manually turned off: Use a larger default setting, 1328 // unless it was manually specified. This is because a too-low value 1329 // will slow down scavenges. 1330 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1331 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1332 } 1333 } 1334 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1335 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1336 // If either of the static initialization defaults have changed, note this 1337 // modification. 1338 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1339 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1340 } 1341 if (PrintGCDetails && Verbose) { 1342 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1343 MarkStackSize / K, MarkStackSizeMax / K); 1344 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1345 } 1346 } 1347 #endif // INCLUDE_ALL_GCS 1348 1349 void set_object_alignment() { 1350 // Object alignment. 1351 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1352 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1353 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1354 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1355 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1356 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1357 1358 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1359 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1360 1361 // Oop encoding heap max 1362 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1363 1364 #if INCLUDE_ALL_GCS 1365 // Set CMS global values 1366 CompactibleFreeListSpace::set_cms_values(); 1367 #endif // INCLUDE_ALL_GCS 1368 } 1369 1370 bool verify_object_alignment() { 1371 // Object alignment. 1372 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1373 jio_fprintf(defaultStream::error_stream(), 1374 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1375 (int)ObjectAlignmentInBytes); 1376 return false; 1377 } 1378 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1379 jio_fprintf(defaultStream::error_stream(), 1380 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1381 (int)ObjectAlignmentInBytes, BytesPerLong); 1382 return false; 1383 } 1384 // It does not make sense to have big object alignment 1385 // since a space lost due to alignment will be greater 1386 // then a saved space from compressed oops. 1387 if ((int)ObjectAlignmentInBytes > 256) { 1388 jio_fprintf(defaultStream::error_stream(), 1389 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1390 (int)ObjectAlignmentInBytes); 1391 return false; 1392 } 1393 // In case page size is very small. 1394 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1395 jio_fprintf(defaultStream::error_stream(), 1396 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1397 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1398 return false; 1399 } 1400 return true; 1401 } 1402 1403 uintx Arguments::max_heap_for_compressed_oops() { 1404 // Avoid sign flip. 1405 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1406 // We need to fit both the NULL page and the heap into the memory budget, while 1407 // keeping alignment constraints of the heap. To guarantee the latter, as the 1408 // NULL page is located before the heap, we pad the NULL page to the conservative 1409 // maximum alignment that the GC may ever impose upon the heap. 1410 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1411 _conservative_max_heap_alignment); 1412 1413 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1414 NOT_LP64(ShouldNotReachHere(); return 0); 1415 } 1416 1417 bool Arguments::should_auto_select_low_pause_collector() { 1418 if (UseAutoGCSelectPolicy && 1419 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1420 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1421 if (PrintGCDetails) { 1422 // Cannot use gclog_or_tty yet. 1423 tty->print_cr("Automatic selection of the low pause collector" 1424 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1425 } 1426 return true; 1427 } 1428 return false; 1429 } 1430 1431 void Arguments::set_use_compressed_oops() { 1432 #ifndef ZERO 1433 #ifdef _LP64 1434 // MaxHeapSize is not set up properly at this point, but 1435 // the only value that can override MaxHeapSize if we are 1436 // to use UseCompressedOops is InitialHeapSize. 1437 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1438 1439 if (max_heap_size <= max_heap_for_compressed_oops()) { 1440 #if !defined(COMPILER1) || defined(TIERED) 1441 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1442 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1443 } 1444 #endif 1445 #ifdef _WIN64 1446 if (UseLargePages && UseCompressedOops) { 1447 // Cannot allocate guard pages for implicit checks in indexed addressing 1448 // mode, when large pages are specified on windows. 1449 // This flag could be switched ON if narrow oop base address is set to 0, 1450 // see code in Universe::initialize_heap(). 1451 Universe::set_narrow_oop_use_implicit_null_checks(false); 1452 } 1453 #endif // _WIN64 1454 } else { 1455 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1456 warning("Max heap size too large for Compressed Oops"); 1457 FLAG_SET_DEFAULT(UseCompressedOops, false); 1458 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1459 } 1460 } 1461 #endif // _LP64 1462 #endif // ZERO 1463 } 1464 1465 1466 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1467 // set_use_compressed_oops(). 1468 void Arguments::set_use_compressed_klass_ptrs() { 1469 #ifndef ZERO 1470 #ifdef _LP64 1471 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1472 if (!UseCompressedOops) { 1473 if (UseCompressedClassPointers) { 1474 warning("UseCompressedClassPointers requires UseCompressedOops"); 1475 } 1476 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1477 } else { 1478 // Turn on UseCompressedClassPointers too 1479 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1480 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1481 } 1482 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1483 if (UseCompressedClassPointers) { 1484 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1485 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1486 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1487 } 1488 } 1489 } 1490 #endif // _LP64 1491 #endif // !ZERO 1492 } 1493 1494 void Arguments::set_conservative_max_heap_alignment() { 1495 // The conservative maximum required alignment for the heap is the maximum of 1496 // the alignments imposed by several sources: any requirements from the heap 1497 // itself, the collector policy and the maximum page size we may run the VM 1498 // with. 1499 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1500 #if INCLUDE_ALL_GCS 1501 if (UseParallelGC) { 1502 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1503 } else if (UseG1GC) { 1504 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1505 } 1506 #endif // INCLUDE_ALL_GCS 1507 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(), 1508 CollectorPolicy::compute_max_alignment()); 1509 } 1510 1511 void Arguments::set_ergonomics_flags() { 1512 1513 if (os::is_server_class_machine()) { 1514 // If no other collector is requested explicitly, 1515 // let the VM select the collector based on 1516 // machine class and automatic selection policy. 1517 if (!UseSerialGC && 1518 !UseConcMarkSweepGC && 1519 !UseG1GC && 1520 !UseParNewGC && 1521 FLAG_IS_DEFAULT(UseParallelGC)) { 1522 if (should_auto_select_low_pause_collector()) { 1523 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1524 } else { 1525 FLAG_SET_ERGO(bool, UseParallelGC, true); 1526 } 1527 } 1528 } 1529 #ifdef COMPILER2 1530 // Shared spaces work fine with other GCs but causes bytecode rewriting 1531 // to be disabled, which hurts interpreter performance and decreases 1532 // server performance. When -server is specified, keep the default off 1533 // unless it is asked for. Future work: either add bytecode rewriting 1534 // at link time, or rewrite bytecodes in non-shared methods. 1535 if (!DumpSharedSpaces && !RequireSharedSpaces && 1536 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1537 no_shared_spaces(); 1538 } 1539 #endif 1540 1541 set_conservative_max_heap_alignment(); 1542 1543 #ifndef ZERO 1544 #ifdef _LP64 1545 set_use_compressed_oops(); 1546 1547 // set_use_compressed_klass_ptrs() must be called after calling 1548 // set_use_compressed_oops(). 1549 set_use_compressed_klass_ptrs(); 1550 1551 // Also checks that certain machines are slower with compressed oops 1552 // in vm_version initialization code. 1553 #endif // _LP64 1554 #endif // !ZERO 1555 } 1556 1557 void Arguments::set_parallel_gc_flags() { 1558 assert(UseParallelGC || UseParallelOldGC, "Error"); 1559 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1560 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1561 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1562 } 1563 FLAG_SET_DEFAULT(UseParallelGC, true); 1564 1565 // If no heap maximum was requested explicitly, use some reasonable fraction 1566 // of the physical memory, up to a maximum of 1GB. 1567 FLAG_SET_DEFAULT(ParallelGCThreads, 1568 Abstract_VM_Version::parallel_worker_threads()); 1569 if (ParallelGCThreads == 0) { 1570 jio_fprintf(defaultStream::error_stream(), 1571 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1572 vm_exit(1); 1573 } 1574 1575 1576 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1577 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1578 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1579 // See CR 6362902 for details. 1580 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1581 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1582 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1583 } 1584 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1585 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1586 } 1587 } 1588 1589 if (UseParallelOldGC) { 1590 // Par compact uses lower default values since they are treated as 1591 // minimums. These are different defaults because of the different 1592 // interpretation and are not ergonomically set. 1593 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1594 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1595 } 1596 } 1597 } 1598 1599 void Arguments::set_g1_gc_flags() { 1600 assert(UseG1GC, "Error"); 1601 #ifdef COMPILER1 1602 FastTLABRefill = false; 1603 #endif 1604 FLAG_SET_DEFAULT(ParallelGCThreads, 1605 Abstract_VM_Version::parallel_worker_threads()); 1606 if (ParallelGCThreads == 0) { 1607 FLAG_SET_DEFAULT(ParallelGCThreads, 1608 Abstract_VM_Version::parallel_worker_threads()); 1609 } 1610 1611 // MarkStackSize will be set (if it hasn't been set by the user) 1612 // when concurrent marking is initialized. 1613 // Its value will be based upon the number of parallel marking threads. 1614 // But we do set the maximum mark stack size here. 1615 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1616 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1617 } 1618 1619 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1620 // In G1, we want the default GC overhead goal to be higher than 1621 // say in PS. So we set it here to 10%. Otherwise the heap might 1622 // be expanded more aggressively than we would like it to. In 1623 // fact, even 10% seems to not be high enough in some cases 1624 // (especially small GC stress tests that the main thing they do 1625 // is allocation). We might consider increase it further. 1626 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1627 } 1628 1629 if (PrintGCDetails && Verbose) { 1630 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1631 MarkStackSize / K, MarkStackSizeMax / K); 1632 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1633 } 1634 } 1635 1636 julong Arguments::limit_by_allocatable_memory(julong limit) { 1637 julong max_allocatable; 1638 julong result = limit; 1639 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1640 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1641 } 1642 return result; 1643 } 1644 1645 void Arguments::set_heap_size() { 1646 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1647 // Deprecated flag 1648 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1649 } 1650 1651 const julong phys_mem = 1652 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1653 : (julong)MaxRAM; 1654 1655 // If the maximum heap size has not been set with -Xmx, 1656 // then set it as fraction of the size of physical memory, 1657 // respecting the maximum and minimum sizes of the heap. 1658 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1659 julong reasonable_max = phys_mem / MaxRAMFraction; 1660 1661 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1662 // Small physical memory, so use a minimum fraction of it for the heap 1663 reasonable_max = phys_mem / MinRAMFraction; 1664 } else { 1665 // Not-small physical memory, so require a heap at least 1666 // as large as MaxHeapSize 1667 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1668 } 1669 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1670 // Limit the heap size to ErgoHeapSizeLimit 1671 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1672 } 1673 if (UseCompressedOops) { 1674 // Limit the heap size to the maximum possible when using compressed oops 1675 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1676 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1677 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1678 // but it should be not less than default MaxHeapSize. 1679 max_coop_heap -= HeapBaseMinAddress; 1680 } 1681 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1682 } 1683 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1684 1685 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1686 // An initial heap size was specified on the command line, 1687 // so be sure that the maximum size is consistent. Done 1688 // after call to limit_by_allocatable_memory because that 1689 // method might reduce the allocation size. 1690 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1691 } 1692 1693 if (PrintGCDetails && Verbose) { 1694 // Cannot use gclog_or_tty yet. 1695 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1696 } 1697 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1698 } 1699 1700 // If the minimum or initial heap_size have not been set or requested to be set 1701 // ergonomically, set them accordingly. 1702 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1703 julong reasonable_minimum = (julong)(OldSize + NewSize); 1704 1705 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1706 1707 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1708 1709 if (InitialHeapSize == 0) { 1710 julong reasonable_initial = phys_mem / InitialRAMFraction; 1711 1712 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1713 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1714 1715 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1716 1717 if (PrintGCDetails && Verbose) { 1718 // Cannot use gclog_or_tty yet. 1719 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1720 } 1721 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1722 } 1723 // If the minimum heap size has not been set (via -Xms), 1724 // synchronize with InitialHeapSize to avoid errors with the default value. 1725 if (min_heap_size() == 0) { 1726 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1727 if (PrintGCDetails && Verbose) { 1728 // Cannot use gclog_or_tty yet. 1729 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1730 } 1731 } 1732 } 1733 } 1734 1735 // This must be called after ergonomics because we want bytecode rewriting 1736 // if the server compiler is used, or if UseSharedSpaces is disabled. 1737 void Arguments::set_bytecode_flags() { 1738 // Better not attempt to store into a read-only space. 1739 if (UseSharedSpaces) { 1740 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1741 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1742 } 1743 1744 if (!RewriteBytecodes) { 1745 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1746 } 1747 } 1748 1749 // Aggressive optimization flags -XX:+AggressiveOpts 1750 void Arguments::set_aggressive_opts_flags() { 1751 #ifdef COMPILER2 1752 if (AggressiveUnboxing) { 1753 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1754 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1755 } else if (!EliminateAutoBox) { 1756 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1757 AggressiveUnboxing = false; 1758 } 1759 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1760 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1761 } else if (!DoEscapeAnalysis) { 1762 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1763 AggressiveUnboxing = false; 1764 } 1765 } 1766 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1767 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1768 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1769 } 1770 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1771 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1772 } 1773 1774 // Feed the cache size setting into the JDK 1775 char buffer[1024]; 1776 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1777 add_property(buffer); 1778 } 1779 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1780 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1781 } 1782 #endif 1783 1784 if (AggressiveOpts) { 1785 // Sample flag setting code 1786 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1787 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1788 // } 1789 } 1790 } 1791 1792 //=========================================================================================================== 1793 // Parsing of java.compiler property 1794 1795 void Arguments::process_java_compiler_argument(char* arg) { 1796 // For backwards compatibility, Djava.compiler=NONE or "" 1797 // causes us to switch to -Xint mode UNLESS -Xdebug 1798 // is also specified. 1799 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1800 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1801 } 1802 } 1803 1804 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1805 _sun_java_launcher = strdup(launcher); 1806 if (strcmp("gamma", _sun_java_launcher) == 0) { 1807 _created_by_gamma_launcher = true; 1808 } 1809 } 1810 1811 bool Arguments::created_by_java_launcher() { 1812 assert(_sun_java_launcher != NULL, "property must have value"); 1813 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1814 } 1815 1816 bool Arguments::created_by_gamma_launcher() { 1817 return _created_by_gamma_launcher; 1818 } 1819 1820 //=========================================================================================================== 1821 // Parsing of main arguments 1822 1823 bool Arguments::verify_interval(uintx val, uintx min, 1824 uintx max, const char* name) { 1825 // Returns true iff value is in the inclusive interval [min..max] 1826 // false, otherwise. 1827 if (val >= min && val <= max) { 1828 return true; 1829 } 1830 jio_fprintf(defaultStream::error_stream(), 1831 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1832 " and " UINTX_FORMAT "\n", 1833 name, val, min, max); 1834 return false; 1835 } 1836 1837 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1838 // Returns true if given value is at least specified min threshold 1839 // false, otherwise. 1840 if (val >= min ) { 1841 return true; 1842 } 1843 jio_fprintf(defaultStream::error_stream(), 1844 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1845 name, val, min); 1846 return false; 1847 } 1848 1849 bool Arguments::verify_percentage(uintx value, const char* name) { 1850 if (value <= 100) { 1851 return true; 1852 } 1853 jio_fprintf(defaultStream::error_stream(), 1854 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1855 name, value); 1856 return false; 1857 } 1858 1859 #if !INCLUDE_ALL_GCS 1860 #ifdef ASSERT 1861 static bool verify_serial_gc_flags() { 1862 return (UseSerialGC && 1863 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1864 UseParallelGC || UseParallelOldGC)); 1865 } 1866 #endif // ASSERT 1867 #endif // INCLUDE_ALL_GCS 1868 1869 // check if do gclog rotation 1870 // +UseGCLogFileRotation is a must, 1871 // no gc log rotation when log file not supplied or 1872 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1873 void check_gclog_consistency() { 1874 if (UseGCLogFileRotation) { 1875 if ((Arguments::gc_log_filename() == NULL) || 1876 (NumberOfGCLogFiles == 0) || 1877 (GCLogFileSize == 0)) { 1878 jio_fprintf(defaultStream::output_stream(), 1879 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n" 1880 "where num_of_file > 0 and num_of_size > 0\n" 1881 "GC log rotation is turned off\n"); 1882 UseGCLogFileRotation = false; 1883 } 1884 } 1885 1886 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1887 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1888 jio_fprintf(defaultStream::output_stream(), 1889 "GCLogFileSize changed to minimum 8K\n"); 1890 } 1891 } 1892 1893 // This function is called for -Xloggc:<filename>, it can be used 1894 // to check if a given file name(or string) conforms to the following 1895 // specification: 1896 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1897 // %p and %t only allowed once. We only limit usage of filename not path 1898 bool is_filename_valid(const char *file_name) { 1899 const char* p = file_name; 1900 char file_sep = os::file_separator()[0]; 1901 const char* cp; 1902 // skip prefix path 1903 for (cp = file_name; *cp != '\0'; cp++) { 1904 if (*cp == '/' || *cp == file_sep) { 1905 p = cp + 1; 1906 } 1907 } 1908 1909 int count_p = 0; 1910 int count_t = 0; 1911 while (*p != '\0') { 1912 if ((*p >= '0' && *p <= '9') || 1913 (*p >= 'A' && *p <= 'Z') || 1914 (*p >= 'a' && *p <= 'z') || 1915 *p == '-' || 1916 *p == '_' || 1917 *p == '.') { 1918 p++; 1919 continue; 1920 } 1921 if (*p == '%') { 1922 if(*(p + 1) == 'p') { 1923 p += 2; 1924 count_p ++; 1925 continue; 1926 } 1927 if (*(p + 1) == 't') { 1928 p += 2; 1929 count_t ++; 1930 continue; 1931 } 1932 } 1933 return false; 1934 } 1935 return count_p < 2 && count_t < 2; 1936 } 1937 1938 // Check consistency of GC selection 1939 bool Arguments::check_gc_consistency() { 1940 check_gclog_consistency(); 1941 bool status = true; 1942 // Ensure that the user has not selected conflicting sets 1943 // of collectors. [Note: this check is merely a user convenience; 1944 // collectors over-ride each other so that only a non-conflicting 1945 // set is selected; however what the user gets is not what they 1946 // may have expected from the combination they asked for. It's 1947 // better to reduce user confusion by not allowing them to 1948 // select conflicting combinations. 1949 uint i = 0; 1950 if (UseSerialGC) i++; 1951 if (UseConcMarkSweepGC || UseParNewGC) i++; 1952 if (UseParallelGC || UseParallelOldGC) i++; 1953 if (UseG1GC) i++; 1954 if (i > 1) { 1955 jio_fprintf(defaultStream::error_stream(), 1956 "Conflicting collector combinations in option list; " 1957 "please refer to the release notes for the combinations " 1958 "allowed\n"); 1959 status = false; 1960 } else if (ReservedCodeCacheSize > 2*G) { 1961 // Code cache size larger than MAXINT is not supported. 1962 jio_fprintf(defaultStream::error_stream(), 1963 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 1964 (2*G)/M); 1965 status = false; 1966 } 1967 return status; 1968 } 1969 1970 void Arguments::check_deprecated_gcs() { 1971 if (UseConcMarkSweepGC && !UseParNewGC) { 1972 warning("Using the DefNew young collector with the CMS collector is deprecated " 1973 "and will likely be removed in a future release"); 1974 } 1975 1976 if (UseParNewGC && !UseConcMarkSweepGC) { 1977 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1978 // set up UseSerialGC properly, so that can't be used in the check here. 1979 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1980 "and will likely be removed in a future release"); 1981 } 1982 1983 if (CMSIncrementalMode) { 1984 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1985 } 1986 } 1987 1988 void Arguments::check_deprecated_gc_flags() { 1989 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1990 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1991 "and will likely be removed in future release"); 1992 } 1993 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 1994 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 1995 "Use MaxRAMFraction instead."); 1996 } 1997 } 1998 1999 // Check stack pages settings 2000 bool Arguments::check_stack_pages() 2001 { 2002 bool status = true; 2003 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2004 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2005 // greater stack shadow pages can't generate instruction to bang stack 2006 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2007 return status; 2008 } 2009 2010 // Check the consistency of vm_init_args 2011 bool Arguments::check_vm_args_consistency() { 2012 // Method for adding checks for flag consistency. 2013 // The intent is to warn the user of all possible conflicts, 2014 // before returning an error. 2015 // Note: Needs platform-dependent factoring. 2016 bool status = true; 2017 2018 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 2019 // builds so the cost of stack banging can be measured. 2020 #if (defined(PRODUCT) && defined(SOLARIS)) 2021 if (!UseBoundThreads && !UseStackBanging) { 2022 jio_fprintf(defaultStream::error_stream(), 2023 "-UseStackBanging conflicts with -UseBoundThreads\n"); 2024 2025 status = false; 2026 } 2027 #endif 2028 2029 if (TLABRefillWasteFraction == 0) { 2030 jio_fprintf(defaultStream::error_stream(), 2031 "TLABRefillWasteFraction should be a denominator, " 2032 "not " SIZE_FORMAT "\n", 2033 TLABRefillWasteFraction); 2034 status = false; 2035 } 2036 2037 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2038 "AdaptiveSizePolicyWeight"); 2039 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2040 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 2041 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 2042 2043 // Divide by bucket size to prevent a large size from causing rollover when 2044 // calculating amount of memory needed to be allocated for the String table. 2045 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2046 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2047 2048 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2049 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2050 2051 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 2052 jio_fprintf(defaultStream::error_stream(), 2053 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2054 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 2055 MinHeapFreeRatio, MaxHeapFreeRatio); 2056 status = false; 2057 } 2058 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2059 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 2060 2061 // Min/MaxMetaspaceFreeRatio 2062 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2063 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2064 2065 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2066 jio_fprintf(defaultStream::error_stream(), 2067 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2068 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2069 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2070 MinMetaspaceFreeRatio, 2071 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2072 MaxMetaspaceFreeRatio); 2073 status = false; 2074 } 2075 2076 // Trying to keep 100% free is not practical 2077 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2078 2079 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2080 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2081 } 2082 2083 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2084 // Settings to encourage splitting. 2085 if (!FLAG_IS_CMDLINE(NewRatio)) { 2086 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2087 } 2088 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2089 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2090 } 2091 } 2092 2093 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2094 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2095 if (GCTimeLimit == 100) { 2096 // Turn off gc-overhead-limit-exceeded checks 2097 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2098 } 2099 2100 status = status && check_gc_consistency(); 2101 status = status && check_stack_pages(); 2102 2103 if (CMSIncrementalMode) { 2104 if (!UseConcMarkSweepGC) { 2105 jio_fprintf(defaultStream::error_stream(), 2106 "error: invalid argument combination.\n" 2107 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2108 "selected in order\nto use CMSIncrementalMode.\n"); 2109 status = false; 2110 } else { 2111 status = status && verify_percentage(CMSIncrementalDutyCycle, 2112 "CMSIncrementalDutyCycle"); 2113 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2114 "CMSIncrementalDutyCycleMin"); 2115 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2116 "CMSIncrementalSafetyFactor"); 2117 status = status && verify_percentage(CMSIncrementalOffset, 2118 "CMSIncrementalOffset"); 2119 status = status && verify_percentage(CMSExpAvgFactor, 2120 "CMSExpAvgFactor"); 2121 // If it was not set on the command line, set 2122 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2123 if (CMSInitiatingOccupancyFraction < 0) { 2124 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2125 } 2126 } 2127 } 2128 2129 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2130 // insists that we hold the requisite locks so that the iteration is 2131 // MT-safe. For the verification at start-up and shut-down, we don't 2132 // yet have a good way of acquiring and releasing these locks, 2133 // which are not visible at the CollectedHeap level. We want to 2134 // be able to acquire these locks and then do the iteration rather 2135 // than just disable the lock verification. This will be fixed under 2136 // bug 4788986. 2137 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2138 if (VerifyDuringStartup) { 2139 warning("Heap verification at start-up disabled " 2140 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2141 VerifyDuringStartup = false; // Disable verification at start-up 2142 } 2143 2144 if (VerifyBeforeExit) { 2145 warning("Heap verification at shutdown disabled " 2146 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2147 VerifyBeforeExit = false; // Disable verification at shutdown 2148 } 2149 } 2150 2151 // Note: only executed in non-PRODUCT mode 2152 if (!UseAsyncConcMarkSweepGC && 2153 (ExplicitGCInvokesConcurrent || 2154 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2155 jio_fprintf(defaultStream::error_stream(), 2156 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2157 " with -UseAsyncConcMarkSweepGC"); 2158 status = false; 2159 } 2160 2161 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2162 2163 #if INCLUDE_ALL_GCS 2164 if (UseG1GC) { 2165 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2166 "InitiatingHeapOccupancyPercent"); 2167 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2168 "G1RefProcDrainInterval"); 2169 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2170 "G1ConcMarkStepDurationMillis"); 2171 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2172 "G1ConcRSHotCardLimit"); 2173 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2174 "G1ConcRSLogCacheSize"); 2175 } 2176 if (UseConcMarkSweepGC) { 2177 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2178 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2179 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2180 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2181 2182 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2183 2184 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2185 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2186 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2187 2188 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2189 2190 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2191 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2192 2193 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2194 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2195 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2196 2197 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2198 2199 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2200 2201 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2202 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2203 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2204 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2205 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2206 } 2207 2208 if (UseParallelGC || UseParallelOldGC) { 2209 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2210 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2211 2212 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2213 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2214 2215 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2216 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2217 2218 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2219 2220 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2221 } 2222 #endif // INCLUDE_ALL_GCS 2223 2224 status = status && verify_interval(RefDiscoveryPolicy, 2225 ReferenceProcessor::DiscoveryPolicyMin, 2226 ReferenceProcessor::DiscoveryPolicyMax, 2227 "RefDiscoveryPolicy"); 2228 2229 // Limit the lower bound of this flag to 1 as it is used in a division 2230 // expression. 2231 status = status && verify_interval(TLABWasteTargetPercent, 2232 1, 100, "TLABWasteTargetPercent"); 2233 2234 status = status && verify_object_alignment(); 2235 2236 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2237 "CompressedClassSpaceSize"); 2238 2239 status = status && verify_interval(MarkStackSizeMax, 2240 1, (max_jint - 1), "MarkStackSizeMax"); 2241 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2242 2243 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2244 2245 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2246 2247 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2248 2249 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2250 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2251 2252 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2253 2254 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2255 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2256 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2257 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2258 2259 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2260 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2261 2262 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2263 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2264 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2265 2266 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2267 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2268 2269 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2270 // just for that, so hardcode here. 2271 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2272 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2273 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2274 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2275 2276 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2277 #ifdef SPARC 2278 if (UseConcMarkSweepGC || UseG1GC) { 2279 // Issue a stern warning if the user has explicitly set 2280 // UseMemSetInBOT (it is known to cause issues), but allow 2281 // use for experimentation and debugging. 2282 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2283 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2284 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2285 " on sun4v; please understand that you are using at your own risk!"); 2286 } 2287 } 2288 #endif // SPARC 2289 2290 if (PrintNMTStatistics) { 2291 #if INCLUDE_NMT 2292 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2293 #endif // INCLUDE_NMT 2294 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2295 PrintNMTStatistics = false; 2296 #if INCLUDE_NMT 2297 } 2298 #endif 2299 } 2300 2301 // Need to limit the extent of the padding to reasonable size. 2302 // 8K is well beyond the reasonable HW cache line size, even with the 2303 // aggressive prefetching, while still leaving the room for segregating 2304 // among the distinct pages. 2305 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2306 jio_fprintf(defaultStream::error_stream(), 2307 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2308 ContendedPaddingWidth, 0, 8192); 2309 status = false; 2310 } 2311 2312 // Need to enforce the padding not to break the existing field alignments. 2313 // It is sufficient to check against the largest type size. 2314 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2315 jio_fprintf(defaultStream::error_stream(), 2316 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2317 ContendedPaddingWidth, BytesPerLong); 2318 status = false; 2319 } 2320 2321 // Check lower bounds of the code cache 2322 // Template Interpreter code is approximately 3X larger in debug builds. 2323 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2324 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2325 jio_fprintf(defaultStream::error_stream(), 2326 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2327 os::vm_page_size()/K); 2328 status = false; 2329 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2330 jio_fprintf(defaultStream::error_stream(), 2331 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2332 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2333 status = false; 2334 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2335 jio_fprintf(defaultStream::error_stream(), 2336 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2337 min_code_cache_size/K); 2338 status = false; 2339 } else if (ReservedCodeCacheSize > 2*G) { 2340 // Code cache size larger than MAXINT is not supported. 2341 jio_fprintf(defaultStream::error_stream(), 2342 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2343 (2*G)/M); 2344 status = false; 2345 } 2346 2347 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2348 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2349 2350 return status; 2351 } 2352 2353 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2354 const char* option_type) { 2355 if (ignore) return false; 2356 2357 const char* spacer = " "; 2358 if (option_type == NULL) { 2359 option_type = ++spacer; // Set both to the empty string. 2360 } 2361 2362 if (os::obsolete_option(option)) { 2363 jio_fprintf(defaultStream::error_stream(), 2364 "Obsolete %s%soption: %s\n", option_type, spacer, 2365 option->optionString); 2366 return false; 2367 } else { 2368 jio_fprintf(defaultStream::error_stream(), 2369 "Unrecognized %s%soption: %s\n", option_type, spacer, 2370 option->optionString); 2371 return true; 2372 } 2373 } 2374 2375 static const char* user_assertion_options[] = { 2376 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2377 }; 2378 2379 static const char* system_assertion_options[] = { 2380 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2381 }; 2382 2383 // Return true if any of the strings in null-terminated array 'names' matches. 2384 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2385 // the option must match exactly. 2386 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2387 bool tail_allowed) { 2388 for (/* empty */; *names != NULL; ++names) { 2389 if (match_option(option, *names, tail)) { 2390 if (**tail == '\0' || tail_allowed && **tail == ':') { 2391 return true; 2392 } 2393 } 2394 } 2395 return false; 2396 } 2397 2398 bool Arguments::parse_uintx(const char* value, 2399 uintx* uintx_arg, 2400 uintx min_size) { 2401 2402 // Check the sign first since atomull() parses only unsigned values. 2403 bool value_is_positive = !(*value == '-'); 2404 2405 if (value_is_positive) { 2406 julong n; 2407 bool good_return = atomull(value, &n); 2408 if (good_return) { 2409 bool above_minimum = n >= min_size; 2410 bool value_is_too_large = n > max_uintx; 2411 2412 if (above_minimum && !value_is_too_large) { 2413 *uintx_arg = n; 2414 return true; 2415 } 2416 } 2417 } 2418 return false; 2419 } 2420 2421 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2422 julong* long_arg, 2423 julong min_size) { 2424 if (!atomull(s, long_arg)) return arg_unreadable; 2425 return check_memory_size(*long_arg, min_size); 2426 } 2427 2428 // Parse JavaVMInitArgs structure 2429 2430 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2431 // For components of the system classpath. 2432 SysClassPath scp(Arguments::get_sysclasspath()); 2433 bool scp_assembly_required = false; 2434 2435 // Save default settings for some mode flags 2436 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2437 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2438 Arguments::_ClipInlining = ClipInlining; 2439 Arguments::_BackgroundCompilation = BackgroundCompilation; 2440 2441 // Setup flags for mixed which is the default 2442 set_mode_flags(_mixed); 2443 2444 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2445 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2446 if (result != JNI_OK) { 2447 return result; 2448 } 2449 2450 // Parse JavaVMInitArgs structure passed in 2451 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2452 if (result != JNI_OK) { 2453 return result; 2454 } 2455 2456 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2457 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2458 if (result != JNI_OK) { 2459 return result; 2460 } 2461 2462 // Do final processing now that all arguments have been parsed 2463 result = finalize_vm_init_args(&scp, scp_assembly_required); 2464 if (result != JNI_OK) { 2465 return result; 2466 } 2467 2468 return JNI_OK; 2469 } 2470 2471 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2472 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2473 // are dealing with -agentpath (case where name is a path), otherwise with 2474 // -agentlib 2475 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2476 char *_name; 2477 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2478 size_t _len_hprof, _len_jdwp, _len_prefix; 2479 2480 if (is_path) { 2481 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2482 return false; 2483 } 2484 2485 _name++; // skip past last path separator 2486 _len_prefix = strlen(JNI_LIB_PREFIX); 2487 2488 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2489 return false; 2490 } 2491 2492 _name += _len_prefix; 2493 _len_hprof = strlen(_hprof); 2494 _len_jdwp = strlen(_jdwp); 2495 2496 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2497 _name += _len_hprof; 2498 } 2499 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2500 _name += _len_jdwp; 2501 } 2502 else { 2503 return false; 2504 } 2505 2506 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2507 return false; 2508 } 2509 2510 return true; 2511 } 2512 2513 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2514 return true; 2515 } 2516 2517 return false; 2518 } 2519 2520 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2521 SysClassPath* scp_p, 2522 bool* scp_assembly_required_p, 2523 Flag::Flags origin) { 2524 // Remaining part of option string 2525 const char* tail; 2526 2527 // iterate over arguments 2528 for (int index = 0; index < args->nOptions; index++) { 2529 bool is_absolute_path = false; // for -agentpath vs -agentlib 2530 2531 const JavaVMOption* option = args->options + index; 2532 2533 if (!match_option(option, "-Djava.class.path", &tail) && 2534 !match_option(option, "-Dsun.java.command", &tail) && 2535 !match_option(option, "-Dsun.java.launcher", &tail)) { 2536 2537 // add all jvm options to the jvm_args string. This string 2538 // is used later to set the java.vm.args PerfData string constant. 2539 // the -Djava.class.path and the -Dsun.java.command options are 2540 // omitted from jvm_args string as each have their own PerfData 2541 // string constant object. 2542 build_jvm_args(option->optionString); 2543 } 2544 2545 // -verbose:[class/gc/jni] 2546 if (match_option(option, "-verbose", &tail)) { 2547 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2548 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2549 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2550 } else if (!strcmp(tail, ":gc")) { 2551 FLAG_SET_CMDLINE(bool, PrintGC, true); 2552 } else if (!strcmp(tail, ":jni")) { 2553 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2554 } 2555 // -da / -ea / -disableassertions / -enableassertions 2556 // These accept an optional class/package name separated by a colon, e.g., 2557 // -da:java.lang.Thread. 2558 } else if (match_option(option, user_assertion_options, &tail, true)) { 2559 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2560 if (*tail == '\0') { 2561 JavaAssertions::setUserClassDefault(enable); 2562 } else { 2563 assert(*tail == ':', "bogus match by match_option()"); 2564 JavaAssertions::addOption(tail + 1, enable); 2565 } 2566 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2567 } else if (match_option(option, system_assertion_options, &tail, false)) { 2568 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2569 JavaAssertions::setSystemClassDefault(enable); 2570 // -bootclasspath: 2571 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2572 scp_p->reset_path(tail); 2573 *scp_assembly_required_p = true; 2574 // -bootclasspath/a: 2575 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2576 scp_p->add_suffix(tail); 2577 *scp_assembly_required_p = true; 2578 // -bootclasspath/p: 2579 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2580 scp_p->add_prefix(tail); 2581 *scp_assembly_required_p = true; 2582 // -Xrun 2583 } else if (match_option(option, "-Xrun", &tail)) { 2584 if (tail != NULL) { 2585 const char* pos = strchr(tail, ':'); 2586 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2587 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2588 name[len] = '\0'; 2589 2590 char *options = NULL; 2591 if(pos != NULL) { 2592 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2593 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2594 } 2595 #if !INCLUDE_JVMTI 2596 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2597 jio_fprintf(defaultStream::error_stream(), 2598 "Profiling and debugging agents are not supported in this VM\n"); 2599 return JNI_ERR; 2600 } 2601 #endif // !INCLUDE_JVMTI 2602 add_init_library(name, options); 2603 } 2604 // -agentlib and -agentpath 2605 } else if (match_option(option, "-agentlib:", &tail) || 2606 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2607 if(tail != NULL) { 2608 const char* pos = strchr(tail, '='); 2609 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2610 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2611 name[len] = '\0'; 2612 2613 char *options = NULL; 2614 if(pos != NULL) { 2615 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2616 } 2617 #if !INCLUDE_JVMTI 2618 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2619 jio_fprintf(defaultStream::error_stream(), 2620 "Profiling and debugging agents are not supported in this VM\n"); 2621 return JNI_ERR; 2622 } 2623 #endif // !INCLUDE_JVMTI 2624 add_init_agent(name, options, is_absolute_path); 2625 } 2626 // -javaagent 2627 } else if (match_option(option, "-javaagent:", &tail)) { 2628 #if !INCLUDE_JVMTI 2629 jio_fprintf(defaultStream::error_stream(), 2630 "Instrumentation agents are not supported in this VM\n"); 2631 return JNI_ERR; 2632 #else 2633 if(tail != NULL) { 2634 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2635 add_init_agent("instrument", options, false); 2636 } 2637 #endif // !INCLUDE_JVMTI 2638 // -Xnoclassgc 2639 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2640 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2641 // -Xincgc: i-CMS 2642 } else if (match_option(option, "-Xincgc", &tail)) { 2643 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2644 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2645 // -Xnoincgc: no i-CMS 2646 } else if (match_option(option, "-Xnoincgc", &tail)) { 2647 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2648 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2649 // -Xconcgc 2650 } else if (match_option(option, "-Xconcgc", &tail)) { 2651 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2652 // -Xnoconcgc 2653 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2654 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2655 // -Xbatch 2656 } else if (match_option(option, "-Xbatch", &tail)) { 2657 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2658 // -Xmn for compatibility with other JVM vendors 2659 } else if (match_option(option, "-Xmn", &tail)) { 2660 julong long_initial_young_size = 0; 2661 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2662 if (errcode != arg_in_range) { 2663 jio_fprintf(defaultStream::error_stream(), 2664 "Invalid initial young generation size: %s\n", option->optionString); 2665 describe_range_error(errcode); 2666 return JNI_EINVAL; 2667 } 2668 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2669 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2670 // -Xms 2671 } else if (match_option(option, "-Xms", &tail)) { 2672 julong long_initial_heap_size = 0; 2673 // an initial heap size of 0 means automatically determine 2674 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2675 if (errcode != arg_in_range) { 2676 jio_fprintf(defaultStream::error_stream(), 2677 "Invalid initial heap size: %s\n", option->optionString); 2678 describe_range_error(errcode); 2679 return JNI_EINVAL; 2680 } 2681 set_min_heap_size((uintx)long_initial_heap_size); 2682 // Currently the minimum size and the initial heap sizes are the same. 2683 // Can be overridden with -XX:InitialHeapSize. 2684 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2685 // -Xmx 2686 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2687 julong long_max_heap_size = 0; 2688 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2689 if (errcode != arg_in_range) { 2690 jio_fprintf(defaultStream::error_stream(), 2691 "Invalid maximum heap size: %s\n", option->optionString); 2692 describe_range_error(errcode); 2693 return JNI_EINVAL; 2694 } 2695 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2696 // Xmaxf 2697 } else if (match_option(option, "-Xmaxf", &tail)) { 2698 char* err; 2699 int maxf = (int)(strtod(tail, &err) * 100); 2700 if (*err != '\0' || maxf < 0 || maxf > 100) { 2701 jio_fprintf(defaultStream::error_stream(), 2702 "Bad max heap free percentage size: %s\n", 2703 option->optionString); 2704 return JNI_EINVAL; 2705 } else { 2706 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2707 } 2708 // Xminf 2709 } else if (match_option(option, "-Xminf", &tail)) { 2710 char* err; 2711 int minf = (int)(strtod(tail, &err) * 100); 2712 if (*err != '\0' || minf < 0 || minf > 100) { 2713 jio_fprintf(defaultStream::error_stream(), 2714 "Bad min heap free percentage size: %s\n", 2715 option->optionString); 2716 return JNI_EINVAL; 2717 } else { 2718 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2719 } 2720 // -Xss 2721 } else if (match_option(option, "-Xss", &tail)) { 2722 julong long_ThreadStackSize = 0; 2723 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2724 if (errcode != arg_in_range) { 2725 jio_fprintf(defaultStream::error_stream(), 2726 "Invalid thread stack size: %s\n", option->optionString); 2727 describe_range_error(errcode); 2728 return JNI_EINVAL; 2729 } 2730 // Internally track ThreadStackSize in units of 1024 bytes. 2731 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2732 round_to((int)long_ThreadStackSize, K) / K); 2733 // -Xoss 2734 } else if (match_option(option, "-Xoss", &tail)) { 2735 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2736 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2737 julong long_CodeCacheExpansionSize = 0; 2738 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2739 if (errcode != arg_in_range) { 2740 jio_fprintf(defaultStream::error_stream(), 2741 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2742 os::vm_page_size()/K); 2743 return JNI_EINVAL; 2744 } 2745 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2746 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2747 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2748 julong long_ReservedCodeCacheSize = 0; 2749 2750 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2751 if (errcode != arg_in_range) { 2752 jio_fprintf(defaultStream::error_stream(), 2753 "Invalid maximum code cache size: %s.\n", option->optionString); 2754 return JNI_EINVAL; 2755 } 2756 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2757 //-XX:IncreaseFirstTierCompileThresholdAt= 2758 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2759 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2760 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2761 jio_fprintf(defaultStream::error_stream(), 2762 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2763 option->optionString); 2764 return JNI_EINVAL; 2765 } 2766 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2767 // -green 2768 } else if (match_option(option, "-green", &tail)) { 2769 jio_fprintf(defaultStream::error_stream(), 2770 "Green threads support not available\n"); 2771 return JNI_EINVAL; 2772 // -native 2773 } else if (match_option(option, "-native", &tail)) { 2774 // HotSpot always uses native threads, ignore silently for compatibility 2775 // -Xsqnopause 2776 } else if (match_option(option, "-Xsqnopause", &tail)) { 2777 // EVM option, ignore silently for compatibility 2778 // -Xrs 2779 } else if (match_option(option, "-Xrs", &tail)) { 2780 // Classic/EVM option, new functionality 2781 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2782 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2783 // change default internal VM signals used - lower case for back compat 2784 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2785 // -Xoptimize 2786 } else if (match_option(option, "-Xoptimize", &tail)) { 2787 // EVM option, ignore silently for compatibility 2788 // -Xprof 2789 } else if (match_option(option, "-Xprof", &tail)) { 2790 #if INCLUDE_FPROF 2791 _has_profile = true; 2792 #else // INCLUDE_FPROF 2793 jio_fprintf(defaultStream::error_stream(), 2794 "Flat profiling is not supported in this VM.\n"); 2795 return JNI_ERR; 2796 #endif // INCLUDE_FPROF 2797 // -Xconcurrentio 2798 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2799 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2800 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2801 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2802 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2803 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2804 2805 // -Xinternalversion 2806 } else if (match_option(option, "-Xinternalversion", &tail)) { 2807 jio_fprintf(defaultStream::output_stream(), "%s\n", 2808 VM_Version::internal_vm_info_string()); 2809 vm_exit(0); 2810 #ifndef PRODUCT 2811 // -Xprintflags 2812 } else if (match_option(option, "-Xprintflags", &tail)) { 2813 CommandLineFlags::printFlags(tty, false); 2814 vm_exit(0); 2815 #endif 2816 // -D 2817 } else if (match_option(option, "-D", &tail)) { 2818 if (!add_property(tail)) { 2819 return JNI_ENOMEM; 2820 } 2821 // Out of the box management support 2822 if (match_option(option, "-Dcom.sun.management", &tail)) { 2823 #if INCLUDE_MANAGEMENT 2824 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2825 #else 2826 jio_fprintf(defaultStream::output_stream(), 2827 "-Dcom.sun.management is not supported in this VM.\n"); 2828 return JNI_ERR; 2829 #endif 2830 } 2831 // -Xint 2832 } else if (match_option(option, "-Xint", &tail)) { 2833 set_mode_flags(_int); 2834 // -Xmixed 2835 } else if (match_option(option, "-Xmixed", &tail)) { 2836 set_mode_flags(_mixed); 2837 // -Xcomp 2838 } else if (match_option(option, "-Xcomp", &tail)) { 2839 // for testing the compiler; turn off all flags that inhibit compilation 2840 set_mode_flags(_comp); 2841 // -Xshare:dump 2842 } else if (match_option(option, "-Xshare:dump", &tail)) { 2843 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2844 set_mode_flags(_int); // Prevent compilation, which creates objects 2845 // -Xshare:on 2846 } else if (match_option(option, "-Xshare:on", &tail)) { 2847 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2848 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2849 // -Xshare:auto 2850 } else if (match_option(option, "-Xshare:auto", &tail)) { 2851 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2852 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2853 // -Xshare:off 2854 } else if (match_option(option, "-Xshare:off", &tail)) { 2855 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2856 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2857 // -Xverify 2858 } else if (match_option(option, "-Xverify", &tail)) { 2859 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2860 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2861 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2862 } else if (strcmp(tail, ":remote") == 0) { 2863 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2864 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2865 } else if (strcmp(tail, ":none") == 0) { 2866 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2867 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2868 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2869 return JNI_EINVAL; 2870 } 2871 // -Xdebug 2872 } else if (match_option(option, "-Xdebug", &tail)) { 2873 // note this flag has been used, then ignore 2874 set_xdebug_mode(true); 2875 // -Xnoagent 2876 } else if (match_option(option, "-Xnoagent", &tail)) { 2877 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2878 } else if (match_option(option, "-Xboundthreads", &tail)) { 2879 // Bind user level threads to kernel threads (Solaris only) 2880 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2881 } else if (match_option(option, "-Xloggc:", &tail)) { 2882 // Redirect GC output to the file. -Xloggc:<filename> 2883 // ostream_init_log(), when called will use this filename 2884 // to initialize a fileStream. 2885 _gc_log_filename = strdup(tail); 2886 if (!is_filename_valid(_gc_log_filename)) { 2887 jio_fprintf(defaultStream::output_stream(), 2888 "Invalid file name for use with -Xloggc: Filename can only contain the " 2889 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2890 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2891 return JNI_EINVAL; 2892 } 2893 FLAG_SET_CMDLINE(bool, PrintGC, true); 2894 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2895 2896 // JNI hooks 2897 } else if (match_option(option, "-Xcheck", &tail)) { 2898 if (!strcmp(tail, ":jni")) { 2899 #if !INCLUDE_JNI_CHECK 2900 warning("JNI CHECKING is not supported in this VM"); 2901 #else 2902 CheckJNICalls = true; 2903 #endif // INCLUDE_JNI_CHECK 2904 } else if (is_bad_option(option, args->ignoreUnrecognized, 2905 "check")) { 2906 return JNI_EINVAL; 2907 } 2908 } else if (match_option(option, "vfprintf", &tail)) { 2909 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2910 } else if (match_option(option, "exit", &tail)) { 2911 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2912 } else if (match_option(option, "abort", &tail)) { 2913 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2914 // -XX:+AggressiveHeap 2915 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2916 2917 // This option inspects the machine and attempts to set various 2918 // parameters to be optimal for long-running, memory allocation 2919 // intensive jobs. It is intended for machines with large 2920 // amounts of cpu and memory. 2921 2922 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2923 // VM, but we may not be able to represent the total physical memory 2924 // available (like having 8gb of memory on a box but using a 32bit VM). 2925 // Thus, we need to make sure we're using a julong for intermediate 2926 // calculations. 2927 julong initHeapSize; 2928 julong total_memory = os::physical_memory(); 2929 2930 if (total_memory < (julong)256*M) { 2931 jio_fprintf(defaultStream::error_stream(), 2932 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2933 vm_exit(1); 2934 } 2935 2936 // The heap size is half of available memory, or (at most) 2937 // all of possible memory less 160mb (leaving room for the OS 2938 // when using ISM). This is the maximum; because adaptive sizing 2939 // is turned on below, the actual space used may be smaller. 2940 2941 initHeapSize = MIN2(total_memory / (julong)2, 2942 total_memory - (julong)160*M); 2943 2944 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2945 2946 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2947 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2948 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2949 // Currently the minimum size and the initial heap sizes are the same. 2950 set_min_heap_size(initHeapSize); 2951 } 2952 if (FLAG_IS_DEFAULT(NewSize)) { 2953 // Make the young generation 3/8ths of the total heap. 2954 FLAG_SET_CMDLINE(uintx, NewSize, 2955 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2956 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2957 } 2958 2959 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2960 FLAG_SET_DEFAULT(UseLargePages, true); 2961 #endif 2962 2963 // Increase some data structure sizes for efficiency 2964 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2965 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2966 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2967 2968 // See the OldPLABSize comment below, but replace 'after promotion' 2969 // with 'after copying'. YoungPLABSize is the size of the survivor 2970 // space per-gc-thread buffers. The default is 4kw. 2971 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2972 2973 // OldPLABSize is the size of the buffers in the old gen that 2974 // UseParallelGC uses to promote live data that doesn't fit in the 2975 // survivor spaces. At any given time, there's one for each gc thread. 2976 // The default size is 1kw. These buffers are rarely used, since the 2977 // survivor spaces are usually big enough. For specjbb, however, there 2978 // are occasions when there's lots of live data in the young gen 2979 // and we end up promoting some of it. We don't have a definite 2980 // explanation for why bumping OldPLABSize helps, but the theory 2981 // is that a bigger PLAB results in retaining something like the 2982 // original allocation order after promotion, which improves mutator 2983 // locality. A minor effect may be that larger PLABs reduce the 2984 // number of PLAB allocation events during gc. The value of 8kw 2985 // was arrived at by experimenting with specjbb. 2986 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2987 2988 // Enable parallel GC and adaptive generation sizing 2989 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2990 FLAG_SET_DEFAULT(ParallelGCThreads, 2991 Abstract_VM_Version::parallel_worker_threads()); 2992 2993 // Encourage steady state memory management 2994 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2995 2996 // This appears to improve mutator locality 2997 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2998 2999 // Get around early Solaris scheduling bug 3000 // (affinity vs other jobs on system) 3001 // but disallow DR and offlining (5008695). 3002 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3003 3004 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3005 // The last option must always win. 3006 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3007 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3008 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3009 // The last option must always win. 3010 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3011 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3012 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3013 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3014 jio_fprintf(defaultStream::error_stream(), 3015 "Please use CMSClassUnloadingEnabled in place of " 3016 "CMSPermGenSweepingEnabled in the future\n"); 3017 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3018 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3019 jio_fprintf(defaultStream::error_stream(), 3020 "Please use -XX:+UseGCOverheadLimit in place of " 3021 "-XX:+UseGCTimeLimit in the future\n"); 3022 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3023 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3024 jio_fprintf(defaultStream::error_stream(), 3025 "Please use -XX:-UseGCOverheadLimit in place of " 3026 "-XX:-UseGCTimeLimit in the future\n"); 3027 // The TLE options are for compatibility with 1.3 and will be 3028 // removed without notice in a future release. These options 3029 // are not to be documented. 3030 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3031 // No longer used. 3032 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3033 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3034 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3035 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3036 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3037 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3038 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3039 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3040 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3041 // No longer used. 3042 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3043 julong long_tlab_size = 0; 3044 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3045 if (errcode != arg_in_range) { 3046 jio_fprintf(defaultStream::error_stream(), 3047 "Invalid TLAB size: %s\n", option->optionString); 3048 describe_range_error(errcode); 3049 return JNI_EINVAL; 3050 } 3051 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3052 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3053 // No longer used. 3054 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3055 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3056 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3057 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3058 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3059 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3060 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3061 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3062 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3063 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3064 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3065 #if defined(DTRACE_ENABLED) 3066 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3067 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3068 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3069 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3070 #else // defined(DTRACE_ENABLED) 3071 jio_fprintf(defaultStream::error_stream(), 3072 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3073 return JNI_EINVAL; 3074 #endif // defined(DTRACE_ENABLED) 3075 #ifdef ASSERT 3076 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3077 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3078 // disable scavenge before parallel mark-compact 3079 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3080 #endif 3081 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3082 julong cms_blocks_to_claim = (julong)atol(tail); 3083 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3084 jio_fprintf(defaultStream::error_stream(), 3085 "Please use -XX:OldPLABSize in place of " 3086 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3087 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3088 julong cms_blocks_to_claim = (julong)atol(tail); 3089 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3090 jio_fprintf(defaultStream::error_stream(), 3091 "Please use -XX:OldPLABSize in place of " 3092 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3093 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3094 julong old_plab_size = 0; 3095 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3096 if (errcode != arg_in_range) { 3097 jio_fprintf(defaultStream::error_stream(), 3098 "Invalid old PLAB size: %s\n", option->optionString); 3099 describe_range_error(errcode); 3100 return JNI_EINVAL; 3101 } 3102 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3103 jio_fprintf(defaultStream::error_stream(), 3104 "Please use -XX:OldPLABSize in place of " 3105 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3106 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3107 julong young_plab_size = 0; 3108 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3109 if (errcode != arg_in_range) { 3110 jio_fprintf(defaultStream::error_stream(), 3111 "Invalid young PLAB size: %s\n", option->optionString); 3112 describe_range_error(errcode); 3113 return JNI_EINVAL; 3114 } 3115 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3116 jio_fprintf(defaultStream::error_stream(), 3117 "Please use -XX:YoungPLABSize in place of " 3118 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3119 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3120 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3121 julong stack_size = 0; 3122 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3123 if (errcode != arg_in_range) { 3124 jio_fprintf(defaultStream::error_stream(), 3125 "Invalid mark stack size: %s\n", option->optionString); 3126 describe_range_error(errcode); 3127 return JNI_EINVAL; 3128 } 3129 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3130 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3131 julong max_stack_size = 0; 3132 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3133 if (errcode != arg_in_range) { 3134 jio_fprintf(defaultStream::error_stream(), 3135 "Invalid maximum mark stack size: %s\n", 3136 option->optionString); 3137 describe_range_error(errcode); 3138 return JNI_EINVAL; 3139 } 3140 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3141 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3142 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3143 uintx conc_threads = 0; 3144 if (!parse_uintx(tail, &conc_threads, 1)) { 3145 jio_fprintf(defaultStream::error_stream(), 3146 "Invalid concurrent threads: %s\n", option->optionString); 3147 return JNI_EINVAL; 3148 } 3149 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3150 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3151 julong max_direct_memory_size = 0; 3152 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3153 if (errcode != arg_in_range) { 3154 jio_fprintf(defaultStream::error_stream(), 3155 "Invalid maximum direct memory size: %s\n", 3156 option->optionString); 3157 describe_range_error(errcode); 3158 return JNI_EINVAL; 3159 } 3160 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3161 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3162 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3163 // away and will cause VM initialization failures! 3164 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3165 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3166 #if !INCLUDE_MANAGEMENT 3167 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3168 jio_fprintf(defaultStream::error_stream(), 3169 "ManagementServer is not supported in this VM.\n"); 3170 return JNI_ERR; 3171 #endif // INCLUDE_MANAGEMENT 3172 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3173 // Skip -XX:Flags= since that case has already been handled 3174 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3175 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3176 return JNI_EINVAL; 3177 } 3178 } 3179 // Unknown option 3180 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3181 return JNI_ERR; 3182 } 3183 } 3184 3185 // Change the default value for flags which have different default values 3186 // when working with older JDKs. 3187 #ifdef LINUX 3188 if (JDK_Version::current().compare_major(6) <= 0 && 3189 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3190 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3191 } 3192 #endif // LINUX 3193 return JNI_OK; 3194 } 3195 3196 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3197 // This must be done after all -D arguments have been processed. 3198 scp_p->expand_endorsed(); 3199 3200 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3201 // Assemble the bootclasspath elements into the final path. 3202 Arguments::set_sysclasspath(scp_p->combined_path()); 3203 } 3204 3205 // This must be done after all arguments have been processed. 3206 // java_compiler() true means set to "NONE" or empty. 3207 if (java_compiler() && !xdebug_mode()) { 3208 // For backwards compatibility, we switch to interpreted mode if 3209 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3210 // not specified. 3211 set_mode_flags(_int); 3212 } 3213 if (CompileThreshold == 0) { 3214 set_mode_flags(_int); 3215 } 3216 3217 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3218 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3219 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3220 } 3221 3222 #ifndef COMPILER2 3223 // Don't degrade server performance for footprint 3224 if (FLAG_IS_DEFAULT(UseLargePages) && 3225 MaxHeapSize < LargePageHeapSizeThreshold) { 3226 // No need for large granularity pages w/small heaps. 3227 // Note that large pages are enabled/disabled for both the 3228 // Java heap and the code cache. 3229 FLAG_SET_DEFAULT(UseLargePages, false); 3230 } 3231 3232 #else 3233 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3234 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3235 } 3236 #endif 3237 3238 #ifndef TIERED 3239 // Tiered compilation is undefined. 3240 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3241 #endif 3242 3243 // If we are running in a headless jre, force java.awt.headless property 3244 // to be true unless the property has already been set. 3245 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3246 if (os::is_headless_jre()) { 3247 const char* headless = Arguments::get_property("java.awt.headless"); 3248 if (headless == NULL) { 3249 char envbuffer[128]; 3250 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3251 if (!add_property("java.awt.headless=true")) { 3252 return JNI_ENOMEM; 3253 } 3254 } else { 3255 char buffer[256]; 3256 strcpy(buffer, "java.awt.headless="); 3257 strcat(buffer, envbuffer); 3258 if (!add_property(buffer)) { 3259 return JNI_ENOMEM; 3260 } 3261 } 3262 } 3263 } 3264 3265 if (!check_vm_args_consistency()) { 3266 return JNI_ERR; 3267 } 3268 3269 return JNI_OK; 3270 } 3271 3272 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3273 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3274 scp_assembly_required_p); 3275 } 3276 3277 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3278 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3279 scp_assembly_required_p); 3280 } 3281 3282 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3283 const int N_MAX_OPTIONS = 64; 3284 const int OPTION_BUFFER_SIZE = 1024; 3285 char buffer[OPTION_BUFFER_SIZE]; 3286 3287 // The variable will be ignored if it exceeds the length of the buffer. 3288 // Don't check this variable if user has special privileges 3289 // (e.g. unix su command). 3290 if (os::getenv(name, buffer, sizeof(buffer)) && 3291 !os::have_special_privileges()) { 3292 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3293 jio_fprintf(defaultStream::error_stream(), 3294 "Picked up %s: %s\n", name, buffer); 3295 char* rd = buffer; // pointer to the input string (rd) 3296 int i; 3297 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3298 while (isspace(*rd)) rd++; // skip whitespace 3299 if (*rd == 0) break; // we re done when the input string is read completely 3300 3301 // The output, option string, overwrites the input string. 3302 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3303 // input string (rd). 3304 char* wrt = rd; 3305 3306 options[i++].optionString = wrt; // Fill in option 3307 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3308 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3309 int quote = *rd; // matching quote to look for 3310 rd++; // don't copy open quote 3311 while (*rd != quote) { // include everything (even spaces) up until quote 3312 if (*rd == 0) { // string termination means unmatched string 3313 jio_fprintf(defaultStream::error_stream(), 3314 "Unmatched quote in %s\n", name); 3315 return JNI_ERR; 3316 } 3317 *wrt++ = *rd++; // copy to option string 3318 } 3319 rd++; // don't copy close quote 3320 } else { 3321 *wrt++ = *rd++; // copy to option string 3322 } 3323 } 3324 // Need to check if we're done before writing a NULL, 3325 // because the write could be to the byte that rd is pointing to. 3326 if (*rd++ == 0) { 3327 *wrt = 0; 3328 break; 3329 } 3330 *wrt = 0; // Zero terminate option 3331 } 3332 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3333 JavaVMInitArgs vm_args; 3334 vm_args.version = JNI_VERSION_1_2; 3335 vm_args.options = options; 3336 vm_args.nOptions = i; 3337 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3338 3339 if (PrintVMOptions) { 3340 const char* tail; 3341 for (int i = 0; i < vm_args.nOptions; i++) { 3342 const JavaVMOption *option = vm_args.options + i; 3343 if (match_option(option, "-XX:", &tail)) { 3344 logOption(tail); 3345 } 3346 } 3347 } 3348 3349 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3350 } 3351 return JNI_OK; 3352 } 3353 3354 void Arguments::set_shared_spaces_flags() { 3355 if (DumpSharedSpaces) { 3356 if (RequireSharedSpaces) { 3357 warning("cannot dump shared archive while using shared archive"); 3358 } 3359 UseSharedSpaces = false; 3360 #ifdef _LP64 3361 if (!UseCompressedOops || !UseCompressedClassPointers) { 3362 vm_exit_during_initialization( 3363 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3364 } 3365 } else { 3366 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces. 3367 if (!UseCompressedOops || !UseCompressedClassPointers) { 3368 no_shared_spaces(); 3369 } 3370 #endif 3371 } 3372 } 3373 3374 #if !INCLUDE_ALL_GCS 3375 static void force_serial_gc() { 3376 FLAG_SET_DEFAULT(UseSerialGC, true); 3377 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3378 UNSUPPORTED_GC_OPTION(UseG1GC); 3379 UNSUPPORTED_GC_OPTION(UseParallelGC); 3380 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3381 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3382 UNSUPPORTED_GC_OPTION(UseParNewGC); 3383 } 3384 #endif // INCLUDE_ALL_GCS 3385 3386 // Sharing support 3387 // Construct the path to the archive 3388 static char* get_shared_archive_path() { 3389 char *shared_archive_path; 3390 if (SharedArchiveFile == NULL) { 3391 char jvm_path[JVM_MAXPATHLEN]; 3392 os::jvm_path(jvm_path, sizeof(jvm_path)); 3393 char *end = strrchr(jvm_path, *os::file_separator()); 3394 if (end != NULL) *end = '\0'; 3395 size_t jvm_path_len = strlen(jvm_path); 3396 size_t file_sep_len = strlen(os::file_separator()); 3397 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3398 file_sep_len + 20, mtInternal); 3399 if (shared_archive_path != NULL) { 3400 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3401 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3402 strncat(shared_archive_path, "classes.jsa", 11); 3403 } 3404 } else { 3405 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3406 if (shared_archive_path != NULL) { 3407 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3408 } 3409 } 3410 return shared_archive_path; 3411 } 3412 3413 #ifndef PRODUCT 3414 // Determine whether LogVMOutput should be implicitly turned on. 3415 static bool use_vm_log() { 3416 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3417 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3418 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3419 PrintAssembly || TraceDeoptimization || TraceDependencies || 3420 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3421 return true; 3422 } 3423 3424 #ifdef COMPILER1 3425 if (PrintC1Statistics) { 3426 return true; 3427 } 3428 #endif // COMPILER1 3429 3430 #ifdef COMPILER2 3431 if (PrintOptoAssembly || PrintOptoStatistics) { 3432 return true; 3433 } 3434 #endif // COMPILER2 3435 3436 return false; 3437 } 3438 #endif // PRODUCT 3439 3440 // Parse entry point called from JNI_CreateJavaVM 3441 3442 jint Arguments::parse(const JavaVMInitArgs* args) { 3443 3444 // Remaining part of option string 3445 const char* tail; 3446 3447 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3448 const char* hotspotrc = ".hotspotrc"; 3449 bool settings_file_specified = false; 3450 bool needs_hotspotrc_warning = false; 3451 3452 const char* flags_file; 3453 int index; 3454 for (index = 0; index < args->nOptions; index++) { 3455 const JavaVMOption *option = args->options + index; 3456 if (match_option(option, "-XX:Flags=", &tail)) { 3457 flags_file = tail; 3458 settings_file_specified = true; 3459 } 3460 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3461 PrintVMOptions = true; 3462 } 3463 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3464 PrintVMOptions = false; 3465 } 3466 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3467 IgnoreUnrecognizedVMOptions = true; 3468 } 3469 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3470 IgnoreUnrecognizedVMOptions = false; 3471 } 3472 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3473 CommandLineFlags::printFlags(tty, false); 3474 vm_exit(0); 3475 } 3476 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3477 #if INCLUDE_NMT 3478 MemTracker::init_tracking_options(tail); 3479 #else 3480 jio_fprintf(defaultStream::error_stream(), 3481 "Native Memory Tracking is not supported in this VM\n"); 3482 return JNI_ERR; 3483 #endif 3484 } 3485 3486 3487 #ifndef PRODUCT 3488 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3489 CommandLineFlags::printFlags(tty, true); 3490 vm_exit(0); 3491 } 3492 #endif 3493 } 3494 3495 if (IgnoreUnrecognizedVMOptions) { 3496 // uncast const to modify the flag args->ignoreUnrecognized 3497 *(jboolean*)(&args->ignoreUnrecognized) = true; 3498 } 3499 3500 // Parse specified settings file 3501 if (settings_file_specified) { 3502 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3503 return JNI_EINVAL; 3504 } 3505 } else { 3506 #ifdef ASSERT 3507 // Parse default .hotspotrc settings file 3508 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3509 return JNI_EINVAL; 3510 } 3511 #else 3512 struct stat buf; 3513 if (os::stat(hotspotrc, &buf) == 0) { 3514 needs_hotspotrc_warning = true; 3515 } 3516 #endif 3517 } 3518 3519 if (PrintVMOptions) { 3520 for (index = 0; index < args->nOptions; index++) { 3521 const JavaVMOption *option = args->options + index; 3522 if (match_option(option, "-XX:", &tail)) { 3523 logOption(tail); 3524 } 3525 } 3526 } 3527 3528 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3529 jint result = parse_vm_init_args(args); 3530 if (result != JNI_OK) { 3531 return result; 3532 } 3533 3534 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3535 SharedArchivePath = get_shared_archive_path(); 3536 if (SharedArchivePath == NULL) { 3537 return JNI_ENOMEM; 3538 } 3539 3540 // Delay warning until here so that we've had a chance to process 3541 // the -XX:-PrintWarnings flag 3542 if (needs_hotspotrc_warning) { 3543 warning("%s file is present but has been ignored. " 3544 "Run with -XX:Flags=%s to load the file.", 3545 hotspotrc, hotspotrc); 3546 } 3547 3548 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3549 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3550 #endif 3551 3552 #if INCLUDE_ALL_GCS 3553 #if (defined JAVASE_EMBEDDED || defined ARM) 3554 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3555 #endif 3556 #endif 3557 3558 #ifndef PRODUCT 3559 if (TraceBytecodesAt != 0) { 3560 TraceBytecodes = true; 3561 } 3562 if (CountCompiledCalls) { 3563 if (UseCounterDecay) { 3564 warning("UseCounterDecay disabled because CountCalls is set"); 3565 UseCounterDecay = false; 3566 } 3567 } 3568 #endif // PRODUCT 3569 3570 // JSR 292 is not supported before 1.7 3571 if (!JDK_Version::is_gte_jdk17x_version()) { 3572 if (EnableInvokeDynamic) { 3573 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3574 warning("JSR 292 is not supported before 1.7. Disabling support."); 3575 } 3576 EnableInvokeDynamic = false; 3577 } 3578 } 3579 3580 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3581 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3582 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3583 } 3584 ScavengeRootsInCode = 1; 3585 } 3586 3587 if (PrintGCDetails) { 3588 // Turn on -verbose:gc options as well 3589 PrintGC = true; 3590 } 3591 3592 if (!JDK_Version::is_gte_jdk18x_version()) { 3593 // To avoid changing the log format for 7 updates this flag is only 3594 // true by default in JDK8 and above. 3595 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3596 FLAG_SET_DEFAULT(PrintGCCause, false); 3597 } 3598 } 3599 3600 // Set object alignment values. 3601 set_object_alignment(); 3602 3603 #if !INCLUDE_ALL_GCS 3604 force_serial_gc(); 3605 #endif // INCLUDE_ALL_GCS 3606 #if !INCLUDE_CDS 3607 if (DumpSharedSpaces || RequireSharedSpaces) { 3608 jio_fprintf(defaultStream::error_stream(), 3609 "Shared spaces are not supported in this VM\n"); 3610 return JNI_ERR; 3611 } 3612 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3613 warning("Shared spaces are not supported in this VM"); 3614 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3615 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3616 } 3617 no_shared_spaces(); 3618 #endif // INCLUDE_CDS 3619 3620 return JNI_OK; 3621 } 3622 3623 jint Arguments::apply_ergo() { 3624 3625 // Set flags based on ergonomics. 3626 set_ergonomics_flags(); 3627 3628 set_shared_spaces_flags(); 3629 3630 // Check the GC selections again. 3631 if (!check_gc_consistency()) { 3632 return JNI_EINVAL; 3633 } 3634 3635 if (TieredCompilation) { 3636 set_tiered_flags(); 3637 } else { 3638 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3639 if (CompilationPolicyChoice >= 2) { 3640 vm_exit_during_initialization( 3641 "Incompatible compilation policy selected", NULL); 3642 } 3643 } 3644 3645 // Set heap size based on available physical memory 3646 set_heap_size(); 3647 3648 #if INCLUDE_ALL_GCS 3649 // Set per-collector flags 3650 if (UseParallelGC || UseParallelOldGC) { 3651 set_parallel_gc_flags(); 3652 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3653 set_cms_and_parnew_gc_flags(); 3654 } else if (UseParNewGC) { // skipped if CMS is set above 3655 set_parnew_gc_flags(); 3656 } else if (UseG1GC) { 3657 set_g1_gc_flags(); 3658 } 3659 check_deprecated_gcs(); 3660 check_deprecated_gc_flags(); 3661 if (AssumeMP && !UseSerialGC) { 3662 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3663 warning("If the number of processors is expected to increase from one, then" 3664 " you should configure the number of parallel GC threads appropriately" 3665 " using -XX:ParallelGCThreads=N"); 3666 } 3667 } 3668 #else // INCLUDE_ALL_GCS 3669 assert(verify_serial_gc_flags(), "SerialGC unset"); 3670 #endif // INCLUDE_ALL_GCS 3671 3672 // Initialize Metaspace flags and alignments. 3673 Metaspace::ergo_initialize(); 3674 3675 // Set bytecode rewriting flags 3676 set_bytecode_flags(); 3677 3678 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3679 set_aggressive_opts_flags(); 3680 3681 // Turn off biased locking for locking debug mode flags, 3682 // which are subtlely different from each other but neither works with 3683 // biased locking. 3684 if (UseHeavyMonitors 3685 #ifdef COMPILER1 3686 || !UseFastLocking 3687 #endif // COMPILER1 3688 ) { 3689 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3690 // flag set to true on command line; warn the user that they 3691 // can't enable biased locking here 3692 warning("Biased Locking is not supported with locking debug flags" 3693 "; ignoring UseBiasedLocking flag." ); 3694 } 3695 UseBiasedLocking = false; 3696 } 3697 3698 #ifdef CC_INTERP 3699 // Clear flags not supported by the C++ interpreter 3700 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3701 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3702 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3703 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3704 #endif // CC_INTERP 3705 3706 #ifdef COMPILER2 3707 if (!UseBiasedLocking || EmitSync != 0) { 3708 UseOptoBiasInlining = false; 3709 } 3710 if (!EliminateLocks) { 3711 EliminateNestedLocks = false; 3712 } 3713 if (!Inline) { 3714 IncrementalInline = false; 3715 } 3716 #ifndef PRODUCT 3717 if (!IncrementalInline) { 3718 AlwaysIncrementalInline = false; 3719 } 3720 #endif 3721 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3722 // incremental inlining: bump MaxNodeLimit 3723 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3724 } 3725 #endif 3726 3727 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3728 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3729 DebugNonSafepoints = true; 3730 } 3731 3732 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3733 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3734 } 3735 3736 #ifndef PRODUCT 3737 if (CompileTheWorld) { 3738 // Force NmethodSweeper to sweep whole CodeCache each time. 3739 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3740 NmethodSweepFraction = 1; 3741 } 3742 } 3743 3744 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3745 if (use_vm_log()) { 3746 LogVMOutput = true; 3747 } 3748 } 3749 #endif // PRODUCT 3750 3751 if (PrintCommandLineFlags) { 3752 CommandLineFlags::printSetFlags(tty); 3753 } 3754 3755 // Apply CPU specific policy for the BiasedLocking 3756 if (UseBiasedLocking) { 3757 if (!VM_Version::use_biased_locking() && 3758 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3759 UseBiasedLocking = false; 3760 } 3761 } 3762 3763 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3764 // but only if not already set on the commandline 3765 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3766 bool set = false; 3767 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3768 if (!set) { 3769 FLAG_SET_DEFAULT(PauseAtExit, true); 3770 } 3771 } 3772 3773 return JNI_OK; 3774 } 3775 3776 jint Arguments::adjust_after_os() { 3777 #if INCLUDE_ALL_GCS 3778 if (UseParallelGC || UseParallelOldGC) { 3779 if (UseNUMA) { 3780 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3781 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3782 } 3783 // For those collectors or operating systems (eg, Windows) that do 3784 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3785 UseNUMAInterleaving = true; 3786 } 3787 } 3788 #endif // INCLUDE_ALL_GCS 3789 return JNI_OK; 3790 } 3791 3792 int Arguments::PropertyList_count(SystemProperty* pl) { 3793 int count = 0; 3794 while(pl != NULL) { 3795 count++; 3796 pl = pl->next(); 3797 } 3798 return count; 3799 } 3800 3801 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3802 assert(key != NULL, "just checking"); 3803 SystemProperty* prop; 3804 for (prop = pl; prop != NULL; prop = prop->next()) { 3805 if (strcmp(key, prop->key()) == 0) return prop->value(); 3806 } 3807 return NULL; 3808 } 3809 3810 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3811 int count = 0; 3812 const char* ret_val = NULL; 3813 3814 while(pl != NULL) { 3815 if(count >= index) { 3816 ret_val = pl->key(); 3817 break; 3818 } 3819 count++; 3820 pl = pl->next(); 3821 } 3822 3823 return ret_val; 3824 } 3825 3826 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3827 int count = 0; 3828 char* ret_val = NULL; 3829 3830 while(pl != NULL) { 3831 if(count >= index) { 3832 ret_val = pl->value(); 3833 break; 3834 } 3835 count++; 3836 pl = pl->next(); 3837 } 3838 3839 return ret_val; 3840 } 3841 3842 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3843 SystemProperty* p = *plist; 3844 if (p == NULL) { 3845 *plist = new_p; 3846 } else { 3847 while (p->next() != NULL) { 3848 p = p->next(); 3849 } 3850 p->set_next(new_p); 3851 } 3852 } 3853 3854 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3855 if (plist == NULL) 3856 return; 3857 3858 SystemProperty* new_p = new SystemProperty(k, v, true); 3859 PropertyList_add(plist, new_p); 3860 } 3861 3862 // This add maintains unique property key in the list. 3863 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3864 if (plist == NULL) 3865 return; 3866 3867 // If property key exist then update with new value. 3868 SystemProperty* prop; 3869 for (prop = *plist; prop != NULL; prop = prop->next()) { 3870 if (strcmp(k, prop->key()) == 0) { 3871 if (append) { 3872 prop->append_value(v); 3873 } else { 3874 prop->set_value(v); 3875 } 3876 return; 3877 } 3878 } 3879 3880 PropertyList_add(plist, k, v); 3881 } 3882 3883 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3884 // Returns true if all of the source pointed by src has been copied over to 3885 // the destination buffer pointed by buf. Otherwise, returns false. 3886 // Notes: 3887 // 1. If the length (buflen) of the destination buffer excluding the 3888 // NULL terminator character is not long enough for holding the expanded 3889 // pid characters, it also returns false instead of returning the partially 3890 // expanded one. 3891 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3892 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3893 char* buf, size_t buflen) { 3894 const char* p = src; 3895 char* b = buf; 3896 const char* src_end = &src[srclen]; 3897 char* buf_end = &buf[buflen - 1]; 3898 3899 while (p < src_end && b < buf_end) { 3900 if (*p == '%') { 3901 switch (*(++p)) { 3902 case '%': // "%%" ==> "%" 3903 *b++ = *p++; 3904 break; 3905 case 'p': { // "%p" ==> current process id 3906 // buf_end points to the character before the last character so 3907 // that we could write '\0' to the end of the buffer. 3908 size_t buf_sz = buf_end - b + 1; 3909 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3910 3911 // if jio_snprintf fails or the buffer is not long enough to hold 3912 // the expanded pid, returns false. 3913 if (ret < 0 || ret >= (int)buf_sz) { 3914 return false; 3915 } else { 3916 b += ret; 3917 assert(*b == '\0', "fail in copy_expand_pid"); 3918 if (p == src_end && b == buf_end + 1) { 3919 // reach the end of the buffer. 3920 return true; 3921 } 3922 } 3923 p++; 3924 break; 3925 } 3926 default : 3927 *b++ = '%'; 3928 } 3929 } else { 3930 *b++ = *p++; 3931 } 3932 } 3933 *b = '\0'; 3934 return (p == src_end); // return false if not all of the source was copied 3935 }