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, FlagValueOrigin origin) { 629 return CommandLineFlags::boolAtPut(name, &value, origin); 630 } 631 632 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin 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, FlagValueOrigin 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, FlagValueOrigin 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, FlagValueOrigin 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, FlagValueOrigin 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, FlagValueOrigin 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, 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, 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 // Conflict: required to use shared spaces (-Xshare:on), but 1104 // incompatible command line options were chosen. 1105 1106 static void no_shared_spaces() { 1107 if (RequireSharedSpaces) { 1108 jio_fprintf(defaultStream::error_stream(), 1109 "Class data sharing is inconsistent with other specified options.\n"); 1110 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1111 } else { 1112 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1113 } 1114 } 1115 1116 void Arguments::set_tiered_flags() { 1117 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1118 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1119 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1120 } 1121 if (CompilationPolicyChoice < 2) { 1122 vm_exit_during_initialization( 1123 "Incompatible compilation policy selected", NULL); 1124 } 1125 // Increase the code cache size - tiered compiles a lot more. 1126 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1127 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1128 } 1129 if (!UseInterpreter) { // -Xcomp 1130 Tier3InvokeNotifyFreqLog = 0; 1131 Tier4InvocationThreshold = 0; 1132 } 1133 } 1134 1135 #if INCLUDE_ALL_GCS 1136 static void disable_adaptive_size_policy(const char* collector_name) { 1137 if (UseAdaptiveSizePolicy) { 1138 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1139 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1140 collector_name); 1141 } 1142 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1143 } 1144 } 1145 1146 void Arguments::set_parnew_gc_flags() { 1147 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1148 "control point invariant"); 1149 assert(UseParNewGC, "Error"); 1150 1151 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1152 disable_adaptive_size_policy("UseParNewGC"); 1153 1154 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1155 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1156 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1157 } else if (ParallelGCThreads == 0) { 1158 jio_fprintf(defaultStream::error_stream(), 1159 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1160 vm_exit(1); 1161 } 1162 1163 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1164 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1165 // we set them to 1024 and 1024. 1166 // See CR 6362902. 1167 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1168 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1169 } 1170 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1171 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1172 } 1173 1174 // AlwaysTenure flag should make ParNew promote all at first collection. 1175 // See CR 6362902. 1176 if (AlwaysTenure) { 1177 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1178 } 1179 // When using compressed oops, we use local overflow stacks, 1180 // rather than using a global overflow list chained through 1181 // the klass word of the object's pre-image. 1182 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1183 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1184 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1185 } 1186 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1187 } 1188 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1189 } 1190 1191 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1192 // sparc/solaris for certain applications, but would gain from 1193 // further optimization and tuning efforts, and would almost 1194 // certainly gain from analysis of platform and environment. 1195 void Arguments::set_cms_and_parnew_gc_flags() { 1196 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1197 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1198 1199 // If we are using CMS, we prefer to UseParNewGC, 1200 // unless explicitly forbidden. 1201 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1202 FLAG_SET_ERGO(bool, UseParNewGC, true); 1203 } 1204 1205 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1206 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1207 1208 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1209 // as needed. 1210 if (UseParNewGC) { 1211 set_parnew_gc_flags(); 1212 } 1213 1214 size_t max_heap = align_size_down(MaxHeapSize, 1215 CardTableRS::ct_max_alignment_constraint()); 1216 1217 // Now make adjustments for CMS 1218 intx tenuring_default = (intx)6; 1219 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1220 1221 // Preferred young gen size for "short" pauses: 1222 // upper bound depends on # of threads and NewRatio. 1223 const uintx parallel_gc_threads = 1224 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1225 const size_t preferred_max_new_size_unaligned = 1226 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1227 size_t preferred_max_new_size = 1228 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1229 1230 // Unless explicitly requested otherwise, size young gen 1231 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1232 1233 // If either MaxNewSize or NewRatio is set on the command line, 1234 // assume the user is trying to set the size of the young gen. 1235 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1236 1237 // Set MaxNewSize to our calculated preferred_max_new_size unless 1238 // NewSize was set on the command line and it is larger than 1239 // preferred_max_new_size. 1240 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1241 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1242 } else { 1243 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1244 } 1245 if (PrintGCDetails && Verbose) { 1246 // Too early to use gclog_or_tty 1247 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1248 } 1249 1250 // Code along this path potentially sets NewSize and OldSize 1251 if (PrintGCDetails && Verbose) { 1252 // Too early to use gclog_or_tty 1253 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1254 " initial_heap_size: " SIZE_FORMAT 1255 " max_heap: " SIZE_FORMAT, 1256 min_heap_size(), InitialHeapSize, max_heap); 1257 } 1258 size_t min_new = preferred_max_new_size; 1259 if (FLAG_IS_CMDLINE(NewSize)) { 1260 min_new = NewSize; 1261 } 1262 if (max_heap > min_new && min_heap_size() > min_new) { 1263 // Unless explicitly requested otherwise, make young gen 1264 // at least min_new, and at most preferred_max_new_size. 1265 if (FLAG_IS_DEFAULT(NewSize)) { 1266 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1267 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1268 if (PrintGCDetails && Verbose) { 1269 // Too early to use gclog_or_tty 1270 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1271 } 1272 } 1273 // Unless explicitly requested otherwise, size old gen 1274 // so it's NewRatio x of NewSize. 1275 if (FLAG_IS_DEFAULT(OldSize)) { 1276 if (max_heap > NewSize) { 1277 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1278 if (PrintGCDetails && Verbose) { 1279 // Too early to use gclog_or_tty 1280 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1281 } 1282 } 1283 } 1284 } 1285 } 1286 // Unless explicitly requested otherwise, definitely 1287 // promote all objects surviving "tenuring_default" scavenges. 1288 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1289 FLAG_IS_DEFAULT(SurvivorRatio)) { 1290 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1291 } 1292 // If we decided above (or user explicitly requested) 1293 // `promote all' (via MaxTenuringThreshold := 0), 1294 // prefer minuscule survivor spaces so as not to waste 1295 // space for (non-existent) survivors 1296 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1297 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1298 } 1299 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1300 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1301 // This is done in order to make ParNew+CMS configuration to work 1302 // with YoungPLABSize and OldPLABSize options. 1303 // See CR 6362902. 1304 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1305 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1306 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1307 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1308 // the value (either from the command line or ergonomics) of 1309 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1310 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1311 } else { 1312 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1313 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1314 // we'll let it to take precedence. 1315 jio_fprintf(defaultStream::error_stream(), 1316 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1317 " options are specified for the CMS collector." 1318 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1319 } 1320 } 1321 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1322 // OldPLAB sizing manually turned off: Use a larger default setting, 1323 // unless it was manually specified. This is because a too-low value 1324 // will slow down scavenges. 1325 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1326 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1327 } 1328 } 1329 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1330 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1331 // If either of the static initialization defaults have changed, note this 1332 // modification. 1333 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1334 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1335 } 1336 if (PrintGCDetails && Verbose) { 1337 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1338 MarkStackSize / K, MarkStackSizeMax / K); 1339 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1340 } 1341 } 1342 #endif // INCLUDE_ALL_GCS 1343 1344 void set_object_alignment() { 1345 // Object alignment. 1346 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1347 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1348 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1349 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1350 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1351 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1352 1353 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1354 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1355 1356 // Oop encoding heap max 1357 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1358 1359 #if INCLUDE_ALL_GCS 1360 // Set CMS global values 1361 CompactibleFreeListSpace::set_cms_values(); 1362 #endif // INCLUDE_ALL_GCS 1363 } 1364 1365 bool verify_object_alignment() { 1366 // Object alignment. 1367 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1368 jio_fprintf(defaultStream::error_stream(), 1369 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1370 (int)ObjectAlignmentInBytes); 1371 return false; 1372 } 1373 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1374 jio_fprintf(defaultStream::error_stream(), 1375 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1376 (int)ObjectAlignmentInBytes, BytesPerLong); 1377 return false; 1378 } 1379 // It does not make sense to have big object alignment 1380 // since a space lost due to alignment will be greater 1381 // then a saved space from compressed oops. 1382 if ((int)ObjectAlignmentInBytes > 256) { 1383 jio_fprintf(defaultStream::error_stream(), 1384 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1385 (int)ObjectAlignmentInBytes); 1386 return false; 1387 } 1388 // In case page size is very small. 1389 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1390 jio_fprintf(defaultStream::error_stream(), 1391 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1392 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1393 return false; 1394 } 1395 return true; 1396 } 1397 1398 uintx Arguments::max_heap_for_compressed_oops() { 1399 // Avoid sign flip. 1400 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1401 // We need to fit both the NULL page and the heap into the memory budget, while 1402 // keeping alignment constraints of the heap. To guarantee the latter, as the 1403 // NULL page is located before the heap, we pad the NULL page to the conservative 1404 // maximum alignment that the GC may ever impose upon the heap. 1405 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1406 Arguments::conservative_max_heap_alignment()); 1407 1408 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1409 NOT_LP64(ShouldNotReachHere(); return 0); 1410 } 1411 1412 bool Arguments::should_auto_select_low_pause_collector() { 1413 if (UseAutoGCSelectPolicy && 1414 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1415 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1416 if (PrintGCDetails) { 1417 // Cannot use gclog_or_tty yet. 1418 tty->print_cr("Automatic selection of the low pause collector" 1419 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1420 } 1421 return true; 1422 } 1423 return false; 1424 } 1425 1426 void Arguments::set_use_compressed_oops() { 1427 #ifndef ZERO 1428 #ifdef _LP64 1429 // MaxHeapSize is not set up properly at this point, but 1430 // the only value that can override MaxHeapSize if we are 1431 // to use UseCompressedOops is InitialHeapSize. 1432 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1433 1434 if (max_heap_size <= max_heap_for_compressed_oops()) { 1435 #if !defined(COMPILER1) || defined(TIERED) 1436 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1437 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1438 } 1439 #endif 1440 #ifdef _WIN64 1441 if (UseLargePages && UseCompressedOops) { 1442 // Cannot allocate guard pages for implicit checks in indexed addressing 1443 // mode, when large pages are specified on windows. 1444 // This flag could be switched ON if narrow oop base address is set to 0, 1445 // see code in Universe::initialize_heap(). 1446 Universe::set_narrow_oop_use_implicit_null_checks(false); 1447 } 1448 #endif // _WIN64 1449 } else { 1450 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1451 warning("Max heap size too large for Compressed Oops"); 1452 FLAG_SET_DEFAULT(UseCompressedOops, false); 1453 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1454 } 1455 } 1456 #endif // _LP64 1457 #endif // ZERO 1458 } 1459 1460 1461 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1462 // set_use_compressed_oops(). 1463 void Arguments::set_use_compressed_klass_ptrs() { 1464 #ifndef ZERO 1465 #ifdef _LP64 1466 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1467 if (!UseCompressedOops) { 1468 if (UseCompressedClassPointers) { 1469 warning("UseCompressedClassPointers requires UseCompressedOops"); 1470 } 1471 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1472 } else { 1473 // Turn on UseCompressedClassPointers too 1474 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1475 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1476 } 1477 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1478 if (UseCompressedClassPointers) { 1479 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1480 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1481 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1482 } 1483 } 1484 } 1485 #endif // _LP64 1486 #endif // !ZERO 1487 } 1488 1489 void Arguments::set_conservative_max_heap_alignment() { 1490 // The conservative maximum required alignment for the heap is the maximum of 1491 // the alignments imposed by several sources: any requirements from the heap 1492 // itself, the collector policy and the maximum page size we may run the VM 1493 // with. 1494 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1495 #if INCLUDE_ALL_GCS 1496 if (UseParallelGC) { 1497 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1498 } else if (UseG1GC) { 1499 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1500 } 1501 #endif // INCLUDE_ALL_GCS 1502 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(), 1503 CollectorPolicy::compute_max_alignment()); 1504 } 1505 1506 void Arguments::set_ergonomics_flags() { 1507 1508 if (os::is_server_class_machine()) { 1509 // If no other collector is requested explicitly, 1510 // let the VM select the collector based on 1511 // machine class and automatic selection policy. 1512 if (!UseSerialGC && 1513 !UseConcMarkSweepGC && 1514 !UseG1GC && 1515 !UseParNewGC && 1516 FLAG_IS_DEFAULT(UseParallelGC)) { 1517 if (should_auto_select_low_pause_collector()) { 1518 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1519 } else { 1520 FLAG_SET_ERGO(bool, UseParallelGC, true); 1521 } 1522 } 1523 // Shared spaces work fine with other GCs but causes bytecode rewriting 1524 // to be disabled, which hurts interpreter performance and decreases 1525 // server performance. On server class machines, keep the default 1526 // off unless it is asked for. Future work: either add bytecode rewriting 1527 // at link time, or rewrite bytecodes in non-shared methods. 1528 if (!DumpSharedSpaces && !RequireSharedSpaces && 1529 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1530 no_shared_spaces(); 1531 } 1532 } 1533 1534 set_conservative_max_heap_alignment(); 1535 1536 #ifndef ZERO 1537 #ifdef _LP64 1538 set_use_compressed_oops(); 1539 1540 // set_use_compressed_klass_ptrs() must be called after calling 1541 // set_use_compressed_oops(). 1542 set_use_compressed_klass_ptrs(); 1543 1544 // Also checks that certain machines are slower with compressed oops 1545 // in vm_version initialization code. 1546 #endif // _LP64 1547 #endif // !ZERO 1548 } 1549 1550 void Arguments::set_parallel_gc_flags() { 1551 assert(UseParallelGC || UseParallelOldGC, "Error"); 1552 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1553 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1554 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1555 } 1556 FLAG_SET_DEFAULT(UseParallelGC, true); 1557 1558 // If no heap maximum was requested explicitly, use some reasonable fraction 1559 // of the physical memory, up to a maximum of 1GB. 1560 FLAG_SET_DEFAULT(ParallelGCThreads, 1561 Abstract_VM_Version::parallel_worker_threads()); 1562 if (ParallelGCThreads == 0) { 1563 jio_fprintf(defaultStream::error_stream(), 1564 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1565 vm_exit(1); 1566 } 1567 1568 1569 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1570 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1571 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1572 // See CR 6362902 for details. 1573 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1574 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1575 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1576 } 1577 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1578 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1579 } 1580 } 1581 1582 if (UseParallelOldGC) { 1583 // Par compact uses lower default values since they are treated as 1584 // minimums. These are different defaults because of the different 1585 // interpretation and are not ergonomically set. 1586 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1587 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1588 } 1589 } 1590 } 1591 1592 void Arguments::set_g1_gc_flags() { 1593 assert(UseG1GC, "Error"); 1594 #ifdef COMPILER1 1595 FastTLABRefill = false; 1596 #endif 1597 FLAG_SET_DEFAULT(ParallelGCThreads, 1598 Abstract_VM_Version::parallel_worker_threads()); 1599 if (ParallelGCThreads == 0) { 1600 FLAG_SET_DEFAULT(ParallelGCThreads, 1601 Abstract_VM_Version::parallel_worker_threads()); 1602 } 1603 1604 // MarkStackSize will be set (if it hasn't been set by the user) 1605 // when concurrent marking is initialized. 1606 // Its value will be based upon the number of parallel marking threads. 1607 // But we do set the maximum mark stack size here. 1608 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1609 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1610 } 1611 1612 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1613 // In G1, we want the default GC overhead goal to be higher than 1614 // say in PS. So we set it here to 10%. Otherwise the heap might 1615 // be expanded more aggressively than we would like it to. In 1616 // fact, even 10% seems to not be high enough in some cases 1617 // (especially small GC stress tests that the main thing they do 1618 // is allocation). We might consider increase it further. 1619 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1620 } 1621 1622 if (PrintGCDetails && Verbose) { 1623 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1624 MarkStackSize / K, MarkStackSizeMax / K); 1625 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1626 } 1627 } 1628 1629 julong Arguments::limit_by_allocatable_memory(julong limit) { 1630 julong max_allocatable; 1631 julong result = limit; 1632 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1633 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1634 } 1635 return result; 1636 } 1637 1638 void Arguments::set_heap_size() { 1639 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1640 // Deprecated flag 1641 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1642 } 1643 1644 const julong phys_mem = 1645 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1646 : (julong)MaxRAM; 1647 1648 // If the maximum heap size has not been set with -Xmx, 1649 // then set it as fraction of the size of physical memory, 1650 // respecting the maximum and minimum sizes of the heap. 1651 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1652 julong reasonable_max = phys_mem / MaxRAMFraction; 1653 1654 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1655 // Small physical memory, so use a minimum fraction of it for the heap 1656 reasonable_max = phys_mem / MinRAMFraction; 1657 } else { 1658 // Not-small physical memory, so require a heap at least 1659 // as large as MaxHeapSize 1660 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1661 } 1662 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1663 // Limit the heap size to ErgoHeapSizeLimit 1664 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1665 } 1666 if (UseCompressedOops) { 1667 // Limit the heap size to the maximum possible when using compressed oops 1668 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1669 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1670 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1671 // but it should be not less than default MaxHeapSize. 1672 max_coop_heap -= HeapBaseMinAddress; 1673 } 1674 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1675 } 1676 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1677 1678 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1679 // An initial heap size was specified on the command line, 1680 // so be sure that the maximum size is consistent. Done 1681 // after call to limit_by_allocatable_memory because that 1682 // method might reduce the allocation size. 1683 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1684 } 1685 1686 if (PrintGCDetails && Verbose) { 1687 // Cannot use gclog_or_tty yet. 1688 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1689 } 1690 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1691 } 1692 1693 // If the minimum or initial heap_size have not been set or requested to be set 1694 // ergonomically, set them accordingly. 1695 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1696 julong reasonable_minimum = (julong)(OldSize + NewSize); 1697 1698 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1699 1700 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1701 1702 if (InitialHeapSize == 0) { 1703 julong reasonable_initial = phys_mem / InitialRAMFraction; 1704 1705 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1706 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1707 1708 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1709 1710 if (PrintGCDetails && Verbose) { 1711 // Cannot use gclog_or_tty yet. 1712 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1713 } 1714 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1715 } 1716 // If the minimum heap size has not been set (via -Xms), 1717 // synchronize with InitialHeapSize to avoid errors with the default value. 1718 if (min_heap_size() == 0) { 1719 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1720 if (PrintGCDetails && Verbose) { 1721 // Cannot use gclog_or_tty yet. 1722 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1723 } 1724 } 1725 } 1726 } 1727 1728 // This must be called after ergonomics because we want bytecode rewriting 1729 // if the server compiler is used, or if UseSharedSpaces is disabled. 1730 void Arguments::set_bytecode_flags() { 1731 // Better not attempt to store into a read-only space. 1732 if (UseSharedSpaces) { 1733 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1734 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1735 } 1736 1737 if (!RewriteBytecodes) { 1738 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1739 } 1740 } 1741 1742 // Aggressive optimization flags -XX:+AggressiveOpts 1743 void Arguments::set_aggressive_opts_flags() { 1744 #ifdef COMPILER2 1745 if (AggressiveUnboxing) { 1746 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1747 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1748 } else if (!EliminateAutoBox) { 1749 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1750 AggressiveUnboxing = false; 1751 } 1752 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1753 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1754 } else if (!DoEscapeAnalysis) { 1755 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1756 AggressiveUnboxing = false; 1757 } 1758 } 1759 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1760 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1761 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1762 } 1763 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1764 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1765 } 1766 1767 // Feed the cache size setting into the JDK 1768 char buffer[1024]; 1769 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1770 add_property(buffer); 1771 } 1772 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1773 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1774 } 1775 #endif 1776 1777 if (AggressiveOpts) { 1778 // Sample flag setting code 1779 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1780 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1781 // } 1782 } 1783 } 1784 1785 //=========================================================================================================== 1786 // Parsing of java.compiler property 1787 1788 void Arguments::process_java_compiler_argument(char* arg) { 1789 // For backwards compatibility, Djava.compiler=NONE or "" 1790 // causes us to switch to -Xint mode UNLESS -Xdebug 1791 // is also specified. 1792 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1793 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1794 } 1795 } 1796 1797 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1798 _sun_java_launcher = strdup(launcher); 1799 if (strcmp("gamma", _sun_java_launcher) == 0) { 1800 _created_by_gamma_launcher = true; 1801 } 1802 } 1803 1804 bool Arguments::created_by_java_launcher() { 1805 assert(_sun_java_launcher != NULL, "property must have value"); 1806 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1807 } 1808 1809 bool Arguments::created_by_gamma_launcher() { 1810 return _created_by_gamma_launcher; 1811 } 1812 1813 //=========================================================================================================== 1814 // Parsing of main arguments 1815 1816 bool Arguments::verify_interval(uintx val, uintx min, 1817 uintx max, const char* name) { 1818 // Returns true iff value is in the inclusive interval [min..max] 1819 // false, otherwise. 1820 if (val >= min && val <= max) { 1821 return true; 1822 } 1823 jio_fprintf(defaultStream::error_stream(), 1824 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1825 " and " UINTX_FORMAT "\n", 1826 name, val, min, max); 1827 return false; 1828 } 1829 1830 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1831 // Returns true if given value is at least specified min threshold 1832 // false, otherwise. 1833 if (val >= min ) { 1834 return true; 1835 } 1836 jio_fprintf(defaultStream::error_stream(), 1837 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1838 name, val, min); 1839 return false; 1840 } 1841 1842 bool Arguments::verify_percentage(uintx value, const char* name) { 1843 if (value <= 100) { 1844 return true; 1845 } 1846 jio_fprintf(defaultStream::error_stream(), 1847 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1848 name, value); 1849 return false; 1850 } 1851 1852 #if !INCLUDE_ALL_GCS 1853 #ifdef ASSERT 1854 static bool verify_serial_gc_flags() { 1855 return (UseSerialGC && 1856 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1857 UseParallelGC || UseParallelOldGC)); 1858 } 1859 #endif // ASSERT 1860 #endif // INCLUDE_ALL_GCS 1861 1862 // check if do gclog rotation 1863 // +UseGCLogFileRotation is a must, 1864 // no gc log rotation when log file not supplied or 1865 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1866 void check_gclog_consistency() { 1867 if (UseGCLogFileRotation) { 1868 if ((Arguments::gc_log_filename() == NULL) || 1869 (NumberOfGCLogFiles == 0) || 1870 (GCLogFileSize == 0)) { 1871 jio_fprintf(defaultStream::output_stream(), 1872 "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" 1873 "where num_of_file > 0 and num_of_size > 0\n" 1874 "GC log rotation is turned off\n"); 1875 UseGCLogFileRotation = false; 1876 } 1877 } 1878 1879 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1880 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1881 jio_fprintf(defaultStream::output_stream(), 1882 "GCLogFileSize changed to minimum 8K\n"); 1883 } 1884 } 1885 1886 // This function is called for -Xloggc:<filename>, it can be used 1887 // to check if a given file name(or string) conforms to the following 1888 // specification: 1889 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1890 // %p and %t only allowed once. We only limit usage of filename not path 1891 bool is_filename_valid(const char *file_name) { 1892 const char* p = file_name; 1893 char file_sep = os::file_separator()[0]; 1894 const char* cp; 1895 // skip prefix path 1896 for (cp = file_name; *cp != '\0'; cp++) { 1897 if (*cp == '/' || *cp == file_sep) { 1898 p = cp + 1; 1899 } 1900 } 1901 1902 int count_p = 0; 1903 int count_t = 0; 1904 while (*p != '\0') { 1905 if ((*p >= '0' && *p <= '9') || 1906 (*p >= 'A' && *p <= 'Z') || 1907 (*p >= 'a' && *p <= 'z') || 1908 *p == '-' || 1909 *p == '_' || 1910 *p == '.') { 1911 p++; 1912 continue; 1913 } 1914 if (*p == '%') { 1915 if(*(p + 1) == 'p') { 1916 p += 2; 1917 count_p ++; 1918 continue; 1919 } 1920 if (*(p + 1) == 't') { 1921 p += 2; 1922 count_t ++; 1923 continue; 1924 } 1925 } 1926 return false; 1927 } 1928 return count_p < 2 && count_t < 2; 1929 } 1930 1931 // Check consistency of GC selection 1932 bool Arguments::check_gc_consistency() { 1933 check_gclog_consistency(); 1934 bool status = true; 1935 // Ensure that the user has not selected conflicting sets 1936 // of collectors. [Note: this check is merely a user convenience; 1937 // collectors over-ride each other so that only a non-conflicting 1938 // set is selected; however what the user gets is not what they 1939 // may have expected from the combination they asked for. It's 1940 // better to reduce user confusion by not allowing them to 1941 // select conflicting combinations. 1942 uint i = 0; 1943 if (UseSerialGC) i++; 1944 if (UseConcMarkSweepGC || UseParNewGC) i++; 1945 if (UseParallelGC || UseParallelOldGC) i++; 1946 if (UseG1GC) i++; 1947 if (i > 1) { 1948 jio_fprintf(defaultStream::error_stream(), 1949 "Conflicting collector combinations in option list; " 1950 "please refer to the release notes for the combinations " 1951 "allowed\n"); 1952 status = false; 1953 } else if (ReservedCodeCacheSize > 2*G) { 1954 // Code cache size larger than MAXINT is not supported. 1955 jio_fprintf(defaultStream::error_stream(), 1956 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 1957 (2*G)/M); 1958 status = false; 1959 } 1960 return status; 1961 } 1962 1963 void Arguments::check_deprecated_gcs() { 1964 if (UseConcMarkSweepGC && !UseParNewGC) { 1965 warning("Using the DefNew young collector with the CMS collector is deprecated " 1966 "and will likely be removed in a future release"); 1967 } 1968 1969 if (UseParNewGC && !UseConcMarkSweepGC) { 1970 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1971 // set up UseSerialGC properly, so that can't be used in the check here. 1972 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1973 "and will likely be removed in a future release"); 1974 } 1975 1976 if (CMSIncrementalMode) { 1977 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1978 } 1979 } 1980 1981 void Arguments::check_deprecated_gc_flags() { 1982 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1983 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1984 "and will likely be removed in future release"); 1985 } 1986 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 1987 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 1988 "Use MaxRAMFraction instead."); 1989 } 1990 } 1991 1992 // Check stack pages settings 1993 bool Arguments::check_stack_pages() 1994 { 1995 bool status = true; 1996 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1997 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1998 // greater stack shadow pages can't generate instruction to bang stack 1999 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2000 return status; 2001 } 2002 2003 // Check the consistency of vm_init_args 2004 bool Arguments::check_vm_args_consistency() { 2005 // Method for adding checks for flag consistency. 2006 // The intent is to warn the user of all possible conflicts, 2007 // before returning an error. 2008 // Note: Needs platform-dependent factoring. 2009 bool status = true; 2010 2011 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 2012 // builds so the cost of stack banging can be measured. 2013 #if (defined(PRODUCT) && defined(SOLARIS)) 2014 if (!UseBoundThreads && !UseStackBanging) { 2015 jio_fprintf(defaultStream::error_stream(), 2016 "-UseStackBanging conflicts with -UseBoundThreads\n"); 2017 2018 status = false; 2019 } 2020 #endif 2021 2022 if (TLABRefillWasteFraction == 0) { 2023 jio_fprintf(defaultStream::error_stream(), 2024 "TLABRefillWasteFraction should be a denominator, " 2025 "not " SIZE_FORMAT "\n", 2026 TLABRefillWasteFraction); 2027 status = false; 2028 } 2029 2030 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2031 "AdaptiveSizePolicyWeight"); 2032 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2033 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 2034 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 2035 2036 // Divide by bucket size to prevent a large size from causing rollover when 2037 // calculating amount of memory needed to be allocated for the String table. 2038 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2039 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2040 2041 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 2042 jio_fprintf(defaultStream::error_stream(), 2043 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2044 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 2045 MinHeapFreeRatio, MaxHeapFreeRatio); 2046 status = false; 2047 } 2048 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2049 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 2050 2051 // Min/MaxMetaspaceFreeRatio 2052 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2053 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2054 2055 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2056 jio_fprintf(defaultStream::error_stream(), 2057 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2058 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2059 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2060 MinMetaspaceFreeRatio, 2061 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2062 MaxMetaspaceFreeRatio); 2063 status = false; 2064 } 2065 2066 // Trying to keep 100% free is not practical 2067 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2068 2069 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2070 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2071 } 2072 2073 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2074 // Settings to encourage splitting. 2075 if (!FLAG_IS_CMDLINE(NewRatio)) { 2076 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2077 } 2078 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2079 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2080 } 2081 } 2082 2083 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2084 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2085 if (GCTimeLimit == 100) { 2086 // Turn off gc-overhead-limit-exceeded checks 2087 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2088 } 2089 2090 status = status && check_gc_consistency(); 2091 status = status && check_stack_pages(); 2092 2093 if (CMSIncrementalMode) { 2094 if (!UseConcMarkSweepGC) { 2095 jio_fprintf(defaultStream::error_stream(), 2096 "error: invalid argument combination.\n" 2097 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2098 "selected in order\nto use CMSIncrementalMode.\n"); 2099 status = false; 2100 } else { 2101 status = status && verify_percentage(CMSIncrementalDutyCycle, 2102 "CMSIncrementalDutyCycle"); 2103 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2104 "CMSIncrementalDutyCycleMin"); 2105 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2106 "CMSIncrementalSafetyFactor"); 2107 status = status && verify_percentage(CMSIncrementalOffset, 2108 "CMSIncrementalOffset"); 2109 status = status && verify_percentage(CMSExpAvgFactor, 2110 "CMSExpAvgFactor"); 2111 // If it was not set on the command line, set 2112 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2113 if (CMSInitiatingOccupancyFraction < 0) { 2114 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2115 } 2116 } 2117 } 2118 2119 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2120 // insists that we hold the requisite locks so that the iteration is 2121 // MT-safe. For the verification at start-up and shut-down, we don't 2122 // yet have a good way of acquiring and releasing these locks, 2123 // which are not visible at the CollectedHeap level. We want to 2124 // be able to acquire these locks and then do the iteration rather 2125 // than just disable the lock verification. This will be fixed under 2126 // bug 4788986. 2127 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2128 if (VerifyDuringStartup) { 2129 warning("Heap verification at start-up disabled " 2130 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2131 VerifyDuringStartup = false; // Disable verification at start-up 2132 } 2133 2134 if (VerifyBeforeExit) { 2135 warning("Heap verification at shutdown disabled " 2136 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2137 VerifyBeforeExit = false; // Disable verification at shutdown 2138 } 2139 } 2140 2141 // Note: only executed in non-PRODUCT mode 2142 if (!UseAsyncConcMarkSweepGC && 2143 (ExplicitGCInvokesConcurrent || 2144 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2145 jio_fprintf(defaultStream::error_stream(), 2146 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2147 " with -UseAsyncConcMarkSweepGC"); 2148 status = false; 2149 } 2150 2151 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2152 2153 #if INCLUDE_ALL_GCS 2154 if (UseG1GC) { 2155 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2156 "InitiatingHeapOccupancyPercent"); 2157 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2158 "G1RefProcDrainInterval"); 2159 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2160 "G1ConcMarkStepDurationMillis"); 2161 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2162 "G1ConcRSHotCardLimit"); 2163 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2164 "G1ConcRSLogCacheSize"); 2165 } 2166 if (UseConcMarkSweepGC) { 2167 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2168 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2169 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2170 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2171 2172 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2173 2174 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2175 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2176 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2177 2178 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2179 2180 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2181 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2182 2183 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2184 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2185 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2186 2187 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2188 2189 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2190 2191 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2192 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2193 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2194 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2195 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2196 } 2197 2198 if (UseParallelGC || UseParallelOldGC) { 2199 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2200 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2201 2202 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2203 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2204 2205 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2206 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2207 2208 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2209 2210 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2211 } 2212 #endif // INCLUDE_ALL_GCS 2213 2214 status = status && verify_interval(RefDiscoveryPolicy, 2215 ReferenceProcessor::DiscoveryPolicyMin, 2216 ReferenceProcessor::DiscoveryPolicyMax, 2217 "RefDiscoveryPolicy"); 2218 2219 // Limit the lower bound of this flag to 1 as it is used in a division 2220 // expression. 2221 status = status && verify_interval(TLABWasteTargetPercent, 2222 1, 100, "TLABWasteTargetPercent"); 2223 2224 status = status && verify_object_alignment(); 2225 2226 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2227 "CompressedClassSpaceSize"); 2228 2229 status = status && verify_interval(MarkStackSizeMax, 2230 1, (max_jint - 1), "MarkStackSizeMax"); 2231 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2232 2233 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2234 2235 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2236 2237 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2238 2239 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2240 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2241 2242 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2243 2244 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2245 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2246 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2247 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2248 2249 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2250 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2251 2252 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2253 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2254 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2255 2256 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2257 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2258 2259 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2260 // just for that, so hardcode here. 2261 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2262 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2263 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2264 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2265 2266 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2267 #ifdef SPARC 2268 if (UseConcMarkSweepGC || UseG1GC) { 2269 // Issue a stern warning if the user has explicitly set 2270 // UseMemSetInBOT (it is known to cause issues), but allow 2271 // use for experimentation and debugging. 2272 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2273 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2274 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2275 " on sun4v; please understand that you are using at your own risk!"); 2276 } 2277 } 2278 #endif // SPARC 2279 2280 if (PrintNMTStatistics) { 2281 #if INCLUDE_NMT 2282 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2283 #endif // INCLUDE_NMT 2284 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2285 PrintNMTStatistics = false; 2286 #if INCLUDE_NMT 2287 } 2288 #endif 2289 } 2290 2291 // Need to limit the extent of the padding to reasonable size. 2292 // 8K is well beyond the reasonable HW cache line size, even with the 2293 // aggressive prefetching, while still leaving the room for segregating 2294 // among the distinct pages. 2295 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2296 jio_fprintf(defaultStream::error_stream(), 2297 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2298 ContendedPaddingWidth, 0, 8192); 2299 status = false; 2300 } 2301 2302 // Need to enforce the padding not to break the existing field alignments. 2303 // It is sufficient to check against the largest type size. 2304 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2305 jio_fprintf(defaultStream::error_stream(), 2306 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2307 ContendedPaddingWidth, BytesPerLong); 2308 status = false; 2309 } 2310 2311 // Check lower bounds of the code cache 2312 // Template Interpreter code is approximately 3X larger in debug builds. 2313 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2314 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2315 jio_fprintf(defaultStream::error_stream(), 2316 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2317 os::vm_page_size()/K); 2318 status = false; 2319 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2320 jio_fprintf(defaultStream::error_stream(), 2321 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2322 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2323 status = false; 2324 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2325 jio_fprintf(defaultStream::error_stream(), 2326 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2327 min_code_cache_size/K); 2328 status = false; 2329 } else if (ReservedCodeCacheSize > 2*G) { 2330 // Code cache size larger than MAXINT is not supported. 2331 jio_fprintf(defaultStream::error_stream(), 2332 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2333 (2*G)/M); 2334 status = false; 2335 } 2336 return status; 2337 } 2338 2339 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2340 const char* option_type) { 2341 if (ignore) return false; 2342 2343 const char* spacer = " "; 2344 if (option_type == NULL) { 2345 option_type = ++spacer; // Set both to the empty string. 2346 } 2347 2348 if (os::obsolete_option(option)) { 2349 jio_fprintf(defaultStream::error_stream(), 2350 "Obsolete %s%soption: %s\n", option_type, spacer, 2351 option->optionString); 2352 return false; 2353 } else { 2354 jio_fprintf(defaultStream::error_stream(), 2355 "Unrecognized %s%soption: %s\n", option_type, spacer, 2356 option->optionString); 2357 return true; 2358 } 2359 } 2360 2361 static const char* user_assertion_options[] = { 2362 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2363 }; 2364 2365 static const char* system_assertion_options[] = { 2366 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2367 }; 2368 2369 // Return true if any of the strings in null-terminated array 'names' matches. 2370 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2371 // the option must match exactly. 2372 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2373 bool tail_allowed) { 2374 for (/* empty */; *names != NULL; ++names) { 2375 if (match_option(option, *names, tail)) { 2376 if (**tail == '\0' || tail_allowed && **tail == ':') { 2377 return true; 2378 } 2379 } 2380 } 2381 return false; 2382 } 2383 2384 bool Arguments::parse_uintx(const char* value, 2385 uintx* uintx_arg, 2386 uintx min_size) { 2387 2388 // Check the sign first since atomull() parses only unsigned values. 2389 bool value_is_positive = !(*value == '-'); 2390 2391 if (value_is_positive) { 2392 julong n; 2393 bool good_return = atomull(value, &n); 2394 if (good_return) { 2395 bool above_minimum = n >= min_size; 2396 bool value_is_too_large = n > max_uintx; 2397 2398 if (above_minimum && !value_is_too_large) { 2399 *uintx_arg = n; 2400 return true; 2401 } 2402 } 2403 } 2404 return false; 2405 } 2406 2407 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2408 julong* long_arg, 2409 julong min_size) { 2410 if (!atomull(s, long_arg)) return arg_unreadable; 2411 return check_memory_size(*long_arg, min_size); 2412 } 2413 2414 // Parse JavaVMInitArgs structure 2415 2416 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2417 // For components of the system classpath. 2418 SysClassPath scp(Arguments::get_sysclasspath()); 2419 bool scp_assembly_required = false; 2420 2421 // Save default settings for some mode flags 2422 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2423 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2424 Arguments::_ClipInlining = ClipInlining; 2425 Arguments::_BackgroundCompilation = BackgroundCompilation; 2426 2427 // Setup flags for mixed which is the default 2428 set_mode_flags(_mixed); 2429 2430 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2431 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2432 if (result != JNI_OK) { 2433 return result; 2434 } 2435 2436 // Parse JavaVMInitArgs structure passed in 2437 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2438 if (result != JNI_OK) { 2439 return result; 2440 } 2441 2442 if (AggressiveOpts) { 2443 // Insert alt-rt.jar between user-specified bootclasspath 2444 // prefix and the default bootclasspath. os::set_boot_path() 2445 // uses meta_index_dir as the default bootclasspath directory. 2446 const char* altclasses_jar = "alt-rt.jar"; 2447 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2448 strlen(altclasses_jar); 2449 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2450 strcpy(altclasses_path, get_meta_index_dir()); 2451 strcat(altclasses_path, altclasses_jar); 2452 scp.add_suffix_to_prefix(altclasses_path); 2453 scp_assembly_required = true; 2454 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2455 } 2456 2457 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2458 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2459 if (result != JNI_OK) { 2460 return result; 2461 } 2462 2463 // Do final processing now that all arguments have been parsed 2464 result = finalize_vm_init_args(&scp, scp_assembly_required); 2465 if (result != JNI_OK) { 2466 return result; 2467 } 2468 2469 return JNI_OK; 2470 } 2471 2472 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2473 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2474 // are dealing with -agentpath (case where name is a path), otherwise with 2475 // -agentlib 2476 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2477 char *_name; 2478 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2479 size_t _len_hprof, _len_jdwp, _len_prefix; 2480 2481 if (is_path) { 2482 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2483 return false; 2484 } 2485 2486 _name++; // skip past last path separator 2487 _len_prefix = strlen(JNI_LIB_PREFIX); 2488 2489 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2490 return false; 2491 } 2492 2493 _name += _len_prefix; 2494 _len_hprof = strlen(_hprof); 2495 _len_jdwp = strlen(_jdwp); 2496 2497 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2498 _name += _len_hprof; 2499 } 2500 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2501 _name += _len_jdwp; 2502 } 2503 else { 2504 return false; 2505 } 2506 2507 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2508 return false; 2509 } 2510 2511 return true; 2512 } 2513 2514 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2515 return true; 2516 } 2517 2518 return false; 2519 } 2520 2521 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2522 SysClassPath* scp_p, 2523 bool* scp_assembly_required_p, 2524 FlagValueOrigin origin) { 2525 // Remaining part of option string 2526 const char* tail; 2527 2528 // iterate over arguments 2529 for (int index = 0; index < args->nOptions; index++) { 2530 bool is_absolute_path = false; // for -agentpath vs -agentlib 2531 2532 const JavaVMOption* option = args->options + index; 2533 2534 if (!match_option(option, "-Djava.class.path", &tail) && 2535 !match_option(option, "-Dsun.java.command", &tail) && 2536 !match_option(option, "-Dsun.java.launcher", &tail)) { 2537 2538 // add all jvm options to the jvm_args string. This string 2539 // is used later to set the java.vm.args PerfData string constant. 2540 // the -Djava.class.path and the -Dsun.java.command options are 2541 // omitted from jvm_args string as each have their own PerfData 2542 // string constant object. 2543 build_jvm_args(option->optionString); 2544 } 2545 2546 // -verbose:[class/gc/jni] 2547 if (match_option(option, "-verbose", &tail)) { 2548 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2549 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2550 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2551 } else if (!strcmp(tail, ":gc")) { 2552 FLAG_SET_CMDLINE(bool, PrintGC, true); 2553 } else if (!strcmp(tail, ":jni")) { 2554 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2555 } 2556 // -da / -ea / -disableassertions / -enableassertions 2557 // These accept an optional class/package name separated by a colon, e.g., 2558 // -da:java.lang.Thread. 2559 } else if (match_option(option, user_assertion_options, &tail, true)) { 2560 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2561 if (*tail == '\0') { 2562 JavaAssertions::setUserClassDefault(enable); 2563 } else { 2564 assert(*tail == ':', "bogus match by match_option()"); 2565 JavaAssertions::addOption(tail + 1, enable); 2566 } 2567 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2568 } else if (match_option(option, system_assertion_options, &tail, false)) { 2569 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2570 JavaAssertions::setSystemClassDefault(enable); 2571 // -bootclasspath: 2572 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2573 scp_p->reset_path(tail); 2574 *scp_assembly_required_p = true; 2575 // -bootclasspath/a: 2576 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2577 scp_p->add_suffix(tail); 2578 *scp_assembly_required_p = true; 2579 // -bootclasspath/p: 2580 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2581 scp_p->add_prefix(tail); 2582 *scp_assembly_required_p = true; 2583 // -Xrun 2584 } else if (match_option(option, "-Xrun", &tail)) { 2585 if (tail != NULL) { 2586 const char* pos = strchr(tail, ':'); 2587 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2588 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2589 name[len] = '\0'; 2590 2591 char *options = NULL; 2592 if(pos != NULL) { 2593 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2594 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2595 } 2596 #if !INCLUDE_JVMTI 2597 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2598 jio_fprintf(defaultStream::error_stream(), 2599 "Profiling and debugging agents are not supported in this VM\n"); 2600 return JNI_ERR; 2601 } 2602 #endif // !INCLUDE_JVMTI 2603 add_init_library(name, options); 2604 } 2605 // -agentlib and -agentpath 2606 } else if (match_option(option, "-agentlib:", &tail) || 2607 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2608 if(tail != NULL) { 2609 const char* pos = strchr(tail, '='); 2610 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2611 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2612 name[len] = '\0'; 2613 2614 char *options = NULL; 2615 if(pos != NULL) { 2616 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2617 } 2618 #if !INCLUDE_JVMTI 2619 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2620 jio_fprintf(defaultStream::error_stream(), 2621 "Profiling and debugging agents are not supported in this VM\n"); 2622 return JNI_ERR; 2623 } 2624 #endif // !INCLUDE_JVMTI 2625 add_init_agent(name, options, is_absolute_path); 2626 } 2627 // -javaagent 2628 } else if (match_option(option, "-javaagent:", &tail)) { 2629 #if !INCLUDE_JVMTI 2630 jio_fprintf(defaultStream::error_stream(), 2631 "Instrumentation agents are not supported in this VM\n"); 2632 return JNI_ERR; 2633 #else 2634 if(tail != NULL) { 2635 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2636 add_init_agent("instrument", options, false); 2637 } 2638 #endif // !INCLUDE_JVMTI 2639 // -Xnoclassgc 2640 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2641 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2642 // -Xincgc: i-CMS 2643 } else if (match_option(option, "-Xincgc", &tail)) { 2644 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2645 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2646 // -Xnoincgc: no i-CMS 2647 } else if (match_option(option, "-Xnoincgc", &tail)) { 2648 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2649 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2650 // -Xconcgc 2651 } else if (match_option(option, "-Xconcgc", &tail)) { 2652 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2653 // -Xnoconcgc 2654 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2655 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2656 // -Xbatch 2657 } else if (match_option(option, "-Xbatch", &tail)) { 2658 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2659 // -Xmn for compatibility with other JVM vendors 2660 } else if (match_option(option, "-Xmn", &tail)) { 2661 julong long_initial_eden_size = 0; 2662 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2663 if (errcode != arg_in_range) { 2664 jio_fprintf(defaultStream::error_stream(), 2665 "Invalid initial eden size: %s\n", option->optionString); 2666 describe_range_error(errcode); 2667 return JNI_EINVAL; 2668 } 2669 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2670 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2671 // -Xms 2672 } else if (match_option(option, "-Xms", &tail)) { 2673 julong long_initial_heap_size = 0; 2674 // an initial heap size of 0 means automatically determine 2675 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2676 if (errcode != arg_in_range) { 2677 jio_fprintf(defaultStream::error_stream(), 2678 "Invalid initial heap size: %s\n", option->optionString); 2679 describe_range_error(errcode); 2680 return JNI_EINVAL; 2681 } 2682 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2683 // Currently the minimum size and the initial heap sizes are the same. 2684 set_min_heap_size(InitialHeapSize); 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 int maxf = (int)(atof(tail) * 100); 2699 if (maxf < 0 || maxf > 100) { 2700 jio_fprintf(defaultStream::error_stream(), 2701 "Bad max heap free percentage size: %s\n", 2702 option->optionString); 2703 return JNI_EINVAL; 2704 } else { 2705 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2706 } 2707 // Xminf 2708 } else if (match_option(option, "-Xminf", &tail)) { 2709 int minf = (int)(atof(tail) * 100); 2710 if (minf < 0 || minf > 100) { 2711 jio_fprintf(defaultStream::error_stream(), 2712 "Bad min heap free percentage size: %s\n", 2713 option->optionString); 2714 return JNI_EINVAL; 2715 } else { 2716 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2717 } 2718 // -Xss 2719 } else if (match_option(option, "-Xss", &tail)) { 2720 julong long_ThreadStackSize = 0; 2721 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2722 if (errcode != arg_in_range) { 2723 jio_fprintf(defaultStream::error_stream(), 2724 "Invalid thread stack size: %s\n", option->optionString); 2725 describe_range_error(errcode); 2726 return JNI_EINVAL; 2727 } 2728 // Internally track ThreadStackSize in units of 1024 bytes. 2729 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2730 round_to((int)long_ThreadStackSize, K) / K); 2731 // -Xoss 2732 } else if (match_option(option, "-Xoss", &tail)) { 2733 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2734 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2735 julong long_CodeCacheExpansionSize = 0; 2736 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2737 if (errcode != arg_in_range) { 2738 jio_fprintf(defaultStream::error_stream(), 2739 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2740 os::vm_page_size()/K); 2741 return JNI_EINVAL; 2742 } 2743 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2744 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2745 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2746 julong long_ReservedCodeCacheSize = 0; 2747 2748 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2749 if (errcode != arg_in_range) { 2750 jio_fprintf(defaultStream::error_stream(), 2751 "Invalid maximum code cache size: %s.\n", option->optionString); 2752 return JNI_EINVAL; 2753 } 2754 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2755 //-XX:IncreaseFirstTierCompileThresholdAt= 2756 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2757 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2758 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2759 jio_fprintf(defaultStream::error_stream(), 2760 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2761 option->optionString); 2762 return JNI_EINVAL; 2763 } 2764 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2765 // -green 2766 } else if (match_option(option, "-green", &tail)) { 2767 jio_fprintf(defaultStream::error_stream(), 2768 "Green threads support not available\n"); 2769 return JNI_EINVAL; 2770 // -native 2771 } else if (match_option(option, "-native", &tail)) { 2772 // HotSpot always uses native threads, ignore silently for compatibility 2773 // -Xsqnopause 2774 } else if (match_option(option, "-Xsqnopause", &tail)) { 2775 // EVM option, ignore silently for compatibility 2776 // -Xrs 2777 } else if (match_option(option, "-Xrs", &tail)) { 2778 // Classic/EVM option, new functionality 2779 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2780 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2781 // change default internal VM signals used - lower case for back compat 2782 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2783 // -Xoptimize 2784 } else if (match_option(option, "-Xoptimize", &tail)) { 2785 // EVM option, ignore silently for compatibility 2786 // -Xprof 2787 } else if (match_option(option, "-Xprof", &tail)) { 2788 #if INCLUDE_FPROF 2789 _has_profile = true; 2790 #else // INCLUDE_FPROF 2791 jio_fprintf(defaultStream::error_stream(), 2792 "Flat profiling is not supported in this VM.\n"); 2793 return JNI_ERR; 2794 #endif // INCLUDE_FPROF 2795 // -Xconcurrentio 2796 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2797 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2798 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2799 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2800 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2801 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2802 2803 // -Xinternalversion 2804 } else if (match_option(option, "-Xinternalversion", &tail)) { 2805 jio_fprintf(defaultStream::output_stream(), "%s\n", 2806 VM_Version::internal_vm_info_string()); 2807 vm_exit(0); 2808 #ifndef PRODUCT 2809 // -Xprintflags 2810 } else if (match_option(option, "-Xprintflags", &tail)) { 2811 CommandLineFlags::printFlags(tty, false); 2812 vm_exit(0); 2813 #endif 2814 // -D 2815 } else if (match_option(option, "-D", &tail)) { 2816 if (!add_property(tail)) { 2817 return JNI_ENOMEM; 2818 } 2819 // Out of the box management support 2820 if (match_option(option, "-Dcom.sun.management", &tail)) { 2821 #if INCLUDE_MANAGEMENT 2822 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2823 #else 2824 jio_fprintf(defaultStream::output_stream(), 2825 "-Dcom.sun.management is not supported in this VM.\n"); 2826 return JNI_ERR; 2827 #endif 2828 } 2829 // -Xint 2830 } else if (match_option(option, "-Xint", &tail)) { 2831 set_mode_flags(_int); 2832 // -Xmixed 2833 } else if (match_option(option, "-Xmixed", &tail)) { 2834 set_mode_flags(_mixed); 2835 // -Xcomp 2836 } else if (match_option(option, "-Xcomp", &tail)) { 2837 // for testing the compiler; turn off all flags that inhibit compilation 2838 set_mode_flags(_comp); 2839 // -Xshare:dump 2840 } else if (match_option(option, "-Xshare:dump", &tail)) { 2841 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2842 set_mode_flags(_int); // Prevent compilation, which creates objects 2843 // -Xshare:on 2844 } else if (match_option(option, "-Xshare:on", &tail)) { 2845 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2846 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2847 // -Xshare:auto 2848 } else if (match_option(option, "-Xshare:auto", &tail)) { 2849 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2850 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2851 // -Xshare:off 2852 } else if (match_option(option, "-Xshare:off", &tail)) { 2853 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2854 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2855 // -Xverify 2856 } else if (match_option(option, "-Xverify", &tail)) { 2857 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2858 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2859 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2860 } else if (strcmp(tail, ":remote") == 0) { 2861 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2862 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2863 } else if (strcmp(tail, ":none") == 0) { 2864 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2865 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2866 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2867 return JNI_EINVAL; 2868 } 2869 // -Xdebug 2870 } else if (match_option(option, "-Xdebug", &tail)) { 2871 // note this flag has been used, then ignore 2872 set_xdebug_mode(true); 2873 // -Xnoagent 2874 } else if (match_option(option, "-Xnoagent", &tail)) { 2875 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2876 } else if (match_option(option, "-Xboundthreads", &tail)) { 2877 // Bind user level threads to kernel threads (Solaris only) 2878 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2879 } else if (match_option(option, "-Xloggc:", &tail)) { 2880 // Redirect GC output to the file. -Xloggc:<filename> 2881 // ostream_init_log(), when called will use this filename 2882 // to initialize a fileStream. 2883 _gc_log_filename = strdup(tail); 2884 if (!is_filename_valid(_gc_log_filename)) { 2885 jio_fprintf(defaultStream::output_stream(), 2886 "Invalid file name for use with -Xloggc: Filename can only contain the " 2887 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2888 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2889 return JNI_EINVAL; 2890 } 2891 FLAG_SET_CMDLINE(bool, PrintGC, true); 2892 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2893 2894 // JNI hooks 2895 } else if (match_option(option, "-Xcheck", &tail)) { 2896 if (!strcmp(tail, ":jni")) { 2897 #if !INCLUDE_JNI_CHECK 2898 warning("JNI CHECKING is not supported in this VM"); 2899 #else 2900 CheckJNICalls = true; 2901 #endif // INCLUDE_JNI_CHECK 2902 } else if (is_bad_option(option, args->ignoreUnrecognized, 2903 "check")) { 2904 return JNI_EINVAL; 2905 } 2906 } else if (match_option(option, "vfprintf", &tail)) { 2907 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2908 } else if (match_option(option, "exit", &tail)) { 2909 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2910 } else if (match_option(option, "abort", &tail)) { 2911 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2912 // -XX:+AggressiveHeap 2913 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2914 2915 // This option inspects the machine and attempts to set various 2916 // parameters to be optimal for long-running, memory allocation 2917 // intensive jobs. It is intended for machines with large 2918 // amounts of cpu and memory. 2919 2920 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2921 // VM, but we may not be able to represent the total physical memory 2922 // available (like having 8gb of memory on a box but using a 32bit VM). 2923 // Thus, we need to make sure we're using a julong for intermediate 2924 // calculations. 2925 julong initHeapSize; 2926 julong total_memory = os::physical_memory(); 2927 2928 if (total_memory < (julong)256*M) { 2929 jio_fprintf(defaultStream::error_stream(), 2930 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2931 vm_exit(1); 2932 } 2933 2934 // The heap size is half of available memory, or (at most) 2935 // all of possible memory less 160mb (leaving room for the OS 2936 // when using ISM). This is the maximum; because adaptive sizing 2937 // is turned on below, the actual space used may be smaller. 2938 2939 initHeapSize = MIN2(total_memory / (julong)2, 2940 total_memory - (julong)160*M); 2941 2942 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2943 2944 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2945 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2946 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2947 // Currently the minimum size and the initial heap sizes are the same. 2948 set_min_heap_size(initHeapSize); 2949 } 2950 if (FLAG_IS_DEFAULT(NewSize)) { 2951 // Make the young generation 3/8ths of the total heap. 2952 FLAG_SET_CMDLINE(uintx, NewSize, 2953 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2954 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2955 } 2956 2957 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2958 FLAG_SET_DEFAULT(UseLargePages, true); 2959 #endif 2960 2961 // Increase some data structure sizes for efficiency 2962 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2963 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2964 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2965 2966 // See the OldPLABSize comment below, but replace 'after promotion' 2967 // with 'after copying'. YoungPLABSize is the size of the survivor 2968 // space per-gc-thread buffers. The default is 4kw. 2969 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2970 2971 // OldPLABSize is the size of the buffers in the old gen that 2972 // UseParallelGC uses to promote live data that doesn't fit in the 2973 // survivor spaces. At any given time, there's one for each gc thread. 2974 // The default size is 1kw. These buffers are rarely used, since the 2975 // survivor spaces are usually big enough. For specjbb, however, there 2976 // are occasions when there's lots of live data in the young gen 2977 // and we end up promoting some of it. We don't have a definite 2978 // explanation for why bumping OldPLABSize helps, but the theory 2979 // is that a bigger PLAB results in retaining something like the 2980 // original allocation order after promotion, which improves mutator 2981 // locality. A minor effect may be that larger PLABs reduce the 2982 // number of PLAB allocation events during gc. The value of 8kw 2983 // was arrived at by experimenting with specjbb. 2984 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2985 2986 // Enable parallel GC and adaptive generation sizing 2987 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2988 FLAG_SET_DEFAULT(ParallelGCThreads, 2989 Abstract_VM_Version::parallel_worker_threads()); 2990 2991 // Encourage steady state memory management 2992 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2993 2994 // This appears to improve mutator locality 2995 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2996 2997 // Get around early Solaris scheduling bug 2998 // (affinity vs other jobs on system) 2999 // but disallow DR and offlining (5008695). 3000 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3001 3002 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3003 // The last option must always win. 3004 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3005 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3006 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3007 // The last option must always win. 3008 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3009 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3010 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3011 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3012 jio_fprintf(defaultStream::error_stream(), 3013 "Please use CMSClassUnloadingEnabled in place of " 3014 "CMSPermGenSweepingEnabled in the future\n"); 3015 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3016 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3017 jio_fprintf(defaultStream::error_stream(), 3018 "Please use -XX:+UseGCOverheadLimit in place of " 3019 "-XX:+UseGCTimeLimit in the future\n"); 3020 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3021 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3022 jio_fprintf(defaultStream::error_stream(), 3023 "Please use -XX:-UseGCOverheadLimit in place of " 3024 "-XX:-UseGCTimeLimit in the future\n"); 3025 // The TLE options are for compatibility with 1.3 and will be 3026 // removed without notice in a future release. These options 3027 // are not to be documented. 3028 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3029 // No longer used. 3030 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3031 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3032 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3033 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3034 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3035 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3036 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3037 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3038 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3039 // No longer used. 3040 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3041 julong long_tlab_size = 0; 3042 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3043 if (errcode != arg_in_range) { 3044 jio_fprintf(defaultStream::error_stream(), 3045 "Invalid TLAB size: %s\n", option->optionString); 3046 describe_range_error(errcode); 3047 return JNI_EINVAL; 3048 } 3049 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3050 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3051 // No longer used. 3052 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3053 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3054 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3055 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3056 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3057 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3058 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3059 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3060 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3061 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3062 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3063 #if defined(DTRACE_ENABLED) 3064 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3065 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3066 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3067 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3068 #else // defined(DTRACE_ENABLED) 3069 jio_fprintf(defaultStream::error_stream(), 3070 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3071 return JNI_EINVAL; 3072 #endif // defined(DTRACE_ENABLED) 3073 #ifdef ASSERT 3074 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3075 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3076 // disable scavenge before parallel mark-compact 3077 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3078 #endif 3079 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3080 julong cms_blocks_to_claim = (julong)atol(tail); 3081 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3082 jio_fprintf(defaultStream::error_stream(), 3083 "Please use -XX:OldPLABSize in place of " 3084 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3085 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3086 julong cms_blocks_to_claim = (julong)atol(tail); 3087 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3088 jio_fprintf(defaultStream::error_stream(), 3089 "Please use -XX:OldPLABSize in place of " 3090 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3091 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3092 julong old_plab_size = 0; 3093 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3094 if (errcode != arg_in_range) { 3095 jio_fprintf(defaultStream::error_stream(), 3096 "Invalid old PLAB size: %s\n", option->optionString); 3097 describe_range_error(errcode); 3098 return JNI_EINVAL; 3099 } 3100 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3101 jio_fprintf(defaultStream::error_stream(), 3102 "Please use -XX:OldPLABSize in place of " 3103 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3104 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3105 julong young_plab_size = 0; 3106 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3107 if (errcode != arg_in_range) { 3108 jio_fprintf(defaultStream::error_stream(), 3109 "Invalid young PLAB size: %s\n", option->optionString); 3110 describe_range_error(errcode); 3111 return JNI_EINVAL; 3112 } 3113 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3114 jio_fprintf(defaultStream::error_stream(), 3115 "Please use -XX:YoungPLABSize in place of " 3116 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3117 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3118 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3119 julong stack_size = 0; 3120 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3121 if (errcode != arg_in_range) { 3122 jio_fprintf(defaultStream::error_stream(), 3123 "Invalid mark stack size: %s\n", option->optionString); 3124 describe_range_error(errcode); 3125 return JNI_EINVAL; 3126 } 3127 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3128 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3129 julong max_stack_size = 0; 3130 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3131 if (errcode != arg_in_range) { 3132 jio_fprintf(defaultStream::error_stream(), 3133 "Invalid maximum mark stack size: %s\n", 3134 option->optionString); 3135 describe_range_error(errcode); 3136 return JNI_EINVAL; 3137 } 3138 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3139 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3140 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3141 uintx conc_threads = 0; 3142 if (!parse_uintx(tail, &conc_threads, 1)) { 3143 jio_fprintf(defaultStream::error_stream(), 3144 "Invalid concurrent threads: %s\n", option->optionString); 3145 return JNI_EINVAL; 3146 } 3147 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3148 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3149 julong max_direct_memory_size = 0; 3150 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3151 if (errcode != arg_in_range) { 3152 jio_fprintf(defaultStream::error_stream(), 3153 "Invalid maximum direct memory size: %s\n", 3154 option->optionString); 3155 describe_range_error(errcode); 3156 return JNI_EINVAL; 3157 } 3158 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3159 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3160 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3161 // away and will cause VM initialization failures! 3162 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3163 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3164 #if !INCLUDE_MANAGEMENT 3165 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3166 jio_fprintf(defaultStream::error_stream(), 3167 "ManagementServer is not supported in this VM.\n"); 3168 return JNI_ERR; 3169 #endif // INCLUDE_MANAGEMENT 3170 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3171 // Skip -XX:Flags= since that case has already been handled 3172 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3173 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3174 return JNI_EINVAL; 3175 } 3176 } 3177 // Unknown option 3178 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3179 return JNI_ERR; 3180 } 3181 } 3182 3183 // Change the default value for flags which have different default values 3184 // when working with older JDKs. 3185 #ifdef LINUX 3186 if (JDK_Version::current().compare_major(6) <= 0 && 3187 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3188 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3189 } 3190 #endif // LINUX 3191 return JNI_OK; 3192 } 3193 3194 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3195 // This must be done after all -D arguments have been processed. 3196 scp_p->expand_endorsed(); 3197 3198 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3199 // Assemble the bootclasspath elements into the final path. 3200 Arguments::set_sysclasspath(scp_p->combined_path()); 3201 } 3202 3203 // This must be done after all arguments have been processed. 3204 // java_compiler() true means set to "NONE" or empty. 3205 if (java_compiler() && !xdebug_mode()) { 3206 // For backwards compatibility, we switch to interpreted mode if 3207 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3208 // not specified. 3209 set_mode_flags(_int); 3210 } 3211 if (CompileThreshold == 0) { 3212 set_mode_flags(_int); 3213 } 3214 3215 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3216 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3217 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3218 } 3219 3220 #ifndef COMPILER2 3221 // Don't degrade server performance for footprint 3222 if (FLAG_IS_DEFAULT(UseLargePages) && 3223 MaxHeapSize < LargePageHeapSizeThreshold) { 3224 // No need for large granularity pages w/small heaps. 3225 // Note that large pages are enabled/disabled for both the 3226 // Java heap and the code cache. 3227 FLAG_SET_DEFAULT(UseLargePages, false); 3228 } 3229 3230 #else 3231 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3232 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3233 } 3234 #endif 3235 3236 #ifndef TIERED 3237 // Tiered compilation is undefined. 3238 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3239 #endif 3240 3241 // If we are running in a headless jre, force java.awt.headless property 3242 // to be true unless the property has already been set. 3243 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3244 if (os::is_headless_jre()) { 3245 const char* headless = Arguments::get_property("java.awt.headless"); 3246 if (headless == NULL) { 3247 char envbuffer[128]; 3248 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3249 if (!add_property("java.awt.headless=true")) { 3250 return JNI_ENOMEM; 3251 } 3252 } else { 3253 char buffer[256]; 3254 strcpy(buffer, "java.awt.headless="); 3255 strcat(buffer, envbuffer); 3256 if (!add_property(buffer)) { 3257 return JNI_ENOMEM; 3258 } 3259 } 3260 } 3261 } 3262 3263 if (!check_vm_args_consistency()) { 3264 return JNI_ERR; 3265 } 3266 3267 return JNI_OK; 3268 } 3269 3270 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3271 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3272 scp_assembly_required_p); 3273 } 3274 3275 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3276 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3277 scp_assembly_required_p); 3278 } 3279 3280 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3281 const int N_MAX_OPTIONS = 64; 3282 const int OPTION_BUFFER_SIZE = 1024; 3283 char buffer[OPTION_BUFFER_SIZE]; 3284 3285 // The variable will be ignored if it exceeds the length of the buffer. 3286 // Don't check this variable if user has special privileges 3287 // (e.g. unix su command). 3288 if (os::getenv(name, buffer, sizeof(buffer)) && 3289 !os::have_special_privileges()) { 3290 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3291 jio_fprintf(defaultStream::error_stream(), 3292 "Picked up %s: %s\n", name, buffer); 3293 char* rd = buffer; // pointer to the input string (rd) 3294 int i; 3295 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3296 while (isspace(*rd)) rd++; // skip whitespace 3297 if (*rd == 0) break; // we re done when the input string is read completely 3298 3299 // The output, option string, overwrites the input string. 3300 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3301 // input string (rd). 3302 char* wrt = rd; 3303 3304 options[i++].optionString = wrt; // Fill in option 3305 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3306 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3307 int quote = *rd; // matching quote to look for 3308 rd++; // don't copy open quote 3309 while (*rd != quote) { // include everything (even spaces) up until quote 3310 if (*rd == 0) { // string termination means unmatched string 3311 jio_fprintf(defaultStream::error_stream(), 3312 "Unmatched quote in %s\n", name); 3313 return JNI_ERR; 3314 } 3315 *wrt++ = *rd++; // copy to option string 3316 } 3317 rd++; // don't copy close quote 3318 } else { 3319 *wrt++ = *rd++; // copy to option string 3320 } 3321 } 3322 // Need to check if we're done before writing a NULL, 3323 // because the write could be to the byte that rd is pointing to. 3324 if (*rd++ == 0) { 3325 *wrt = 0; 3326 break; 3327 } 3328 *wrt = 0; // Zero terminate option 3329 } 3330 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3331 JavaVMInitArgs vm_args; 3332 vm_args.version = JNI_VERSION_1_2; 3333 vm_args.options = options; 3334 vm_args.nOptions = i; 3335 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3336 3337 if (PrintVMOptions) { 3338 const char* tail; 3339 for (int i = 0; i < vm_args.nOptions; i++) { 3340 const JavaVMOption *option = vm_args.options + i; 3341 if (match_option(option, "-XX:", &tail)) { 3342 logOption(tail); 3343 } 3344 } 3345 } 3346 3347 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3348 } 3349 return JNI_OK; 3350 } 3351 3352 void Arguments::set_shared_spaces_flags() { 3353 if (DumpSharedSpaces) { 3354 if (RequireSharedSpaces) { 3355 warning("cannot dump shared archive while using shared archive"); 3356 } 3357 UseSharedSpaces = false; 3358 #ifdef _LP64 3359 if (!UseCompressedOops || !UseCompressedClassPointers) { 3360 vm_exit_during_initialization( 3361 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3362 } 3363 } else { 3364 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces. 3365 if (!UseCompressedOops || !UseCompressedClassPointers) { 3366 no_shared_spaces(); 3367 } 3368 #endif 3369 } 3370 } 3371 3372 #if !INCLUDE_ALL_GCS 3373 static void force_serial_gc() { 3374 FLAG_SET_DEFAULT(UseSerialGC, true); 3375 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3376 UNSUPPORTED_GC_OPTION(UseG1GC); 3377 UNSUPPORTED_GC_OPTION(UseParallelGC); 3378 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3379 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3380 UNSUPPORTED_GC_OPTION(UseParNewGC); 3381 } 3382 #endif // INCLUDE_ALL_GCS 3383 3384 // Sharing support 3385 // Construct the path to the archive 3386 static char* get_shared_archive_path() { 3387 char *shared_archive_path; 3388 if (SharedArchiveFile == NULL) { 3389 char jvm_path[JVM_MAXPATHLEN]; 3390 os::jvm_path(jvm_path, sizeof(jvm_path)); 3391 char *end = strrchr(jvm_path, *os::file_separator()); 3392 if (end != NULL) *end = '\0'; 3393 size_t jvm_path_len = strlen(jvm_path); 3394 size_t file_sep_len = strlen(os::file_separator()); 3395 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3396 file_sep_len + 20, mtInternal); 3397 if (shared_archive_path != NULL) { 3398 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3399 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3400 strncat(shared_archive_path, "classes.jsa", 11); 3401 } 3402 } else { 3403 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3404 if (shared_archive_path != NULL) { 3405 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3406 } 3407 } 3408 return shared_archive_path; 3409 } 3410 3411 #ifndef PRODUCT 3412 // Determine whether LogVMOutput should be implicitly turned on. 3413 static bool use_vm_log() { 3414 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3415 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3416 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3417 PrintAssembly || TraceDeoptimization || TraceDependencies || 3418 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3419 return true; 3420 } 3421 3422 #ifdef COMPILER1 3423 if (PrintC1Statistics) { 3424 return true; 3425 } 3426 #endif // COMPILER1 3427 3428 #ifdef COMPILER2 3429 if (PrintOptoAssembly || PrintOptoStatistics) { 3430 return true; 3431 } 3432 #endif // COMPILER2 3433 3434 return false; 3435 } 3436 #endif // PRODUCT 3437 3438 // Parse entry point called from JNI_CreateJavaVM 3439 3440 jint Arguments::parse(const JavaVMInitArgs* args) { 3441 3442 // Remaining part of option string 3443 const char* tail; 3444 3445 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3446 const char* hotspotrc = ".hotspotrc"; 3447 bool settings_file_specified = false; 3448 bool needs_hotspotrc_warning = false; 3449 3450 const char* flags_file; 3451 int index; 3452 for (index = 0; index < args->nOptions; index++) { 3453 const JavaVMOption *option = args->options + index; 3454 if (match_option(option, "-XX:Flags=", &tail)) { 3455 flags_file = tail; 3456 settings_file_specified = true; 3457 } 3458 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3459 PrintVMOptions = true; 3460 } 3461 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3462 PrintVMOptions = false; 3463 } 3464 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3465 IgnoreUnrecognizedVMOptions = true; 3466 } 3467 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3468 IgnoreUnrecognizedVMOptions = false; 3469 } 3470 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3471 CommandLineFlags::printFlags(tty, false); 3472 vm_exit(0); 3473 } 3474 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3475 #if INCLUDE_NMT 3476 MemTracker::init_tracking_options(tail); 3477 #else 3478 jio_fprintf(defaultStream::error_stream(), 3479 "Native Memory Tracking is not supported in this VM\n"); 3480 return JNI_ERR; 3481 #endif 3482 } 3483 3484 3485 #ifndef PRODUCT 3486 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3487 CommandLineFlags::printFlags(tty, true); 3488 vm_exit(0); 3489 } 3490 #endif 3491 } 3492 3493 if (IgnoreUnrecognizedVMOptions) { 3494 // uncast const to modify the flag args->ignoreUnrecognized 3495 *(jboolean*)(&args->ignoreUnrecognized) = true; 3496 } 3497 3498 // Parse specified settings file 3499 if (settings_file_specified) { 3500 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3501 return JNI_EINVAL; 3502 } 3503 } else { 3504 #ifdef ASSERT 3505 // Parse default .hotspotrc settings file 3506 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3507 return JNI_EINVAL; 3508 } 3509 #else 3510 struct stat buf; 3511 if (os::stat(hotspotrc, &buf) == 0) { 3512 needs_hotspotrc_warning = true; 3513 } 3514 #endif 3515 } 3516 3517 if (PrintVMOptions) { 3518 for (index = 0; index < args->nOptions; index++) { 3519 const JavaVMOption *option = args->options + index; 3520 if (match_option(option, "-XX:", &tail)) { 3521 logOption(tail); 3522 } 3523 } 3524 } 3525 3526 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3527 jint result = parse_vm_init_args(args); 3528 if (result != JNI_OK) { 3529 return result; 3530 } 3531 3532 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3533 SharedArchivePath = get_shared_archive_path(); 3534 if (SharedArchivePath == NULL) { 3535 return JNI_ENOMEM; 3536 } 3537 3538 // Delay warning until here so that we've had a chance to process 3539 // the -XX:-PrintWarnings flag 3540 if (needs_hotspotrc_warning) { 3541 warning("%s file is present but has been ignored. " 3542 "Run with -XX:Flags=%s to load the file.", 3543 hotspotrc, hotspotrc); 3544 } 3545 3546 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3547 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3548 #endif 3549 3550 #if INCLUDE_ALL_GCS 3551 #if (defined JAVASE_EMBEDDED || defined ARM) 3552 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3553 #endif 3554 #endif 3555 3556 #ifndef PRODUCT 3557 if (TraceBytecodesAt != 0) { 3558 TraceBytecodes = true; 3559 } 3560 if (CountCompiledCalls) { 3561 if (UseCounterDecay) { 3562 warning("UseCounterDecay disabled because CountCalls is set"); 3563 UseCounterDecay = false; 3564 } 3565 } 3566 #endif // PRODUCT 3567 3568 // JSR 292 is not supported before 1.7 3569 if (!JDK_Version::is_gte_jdk17x_version()) { 3570 if (EnableInvokeDynamic) { 3571 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3572 warning("JSR 292 is not supported before 1.7. Disabling support."); 3573 } 3574 EnableInvokeDynamic = false; 3575 } 3576 } 3577 3578 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3579 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3580 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3581 } 3582 ScavengeRootsInCode = 1; 3583 } 3584 3585 if (PrintGCDetails) { 3586 // Turn on -verbose:gc options as well 3587 PrintGC = true; 3588 } 3589 3590 if (!JDK_Version::is_gte_jdk18x_version()) { 3591 // To avoid changing the log format for 7 updates this flag is only 3592 // true by default in JDK8 and above. 3593 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3594 FLAG_SET_DEFAULT(PrintGCCause, false); 3595 } 3596 } 3597 3598 // Set object alignment values. 3599 set_object_alignment(); 3600 3601 #if !INCLUDE_ALL_GCS 3602 force_serial_gc(); 3603 #endif // INCLUDE_ALL_GCS 3604 #if !INCLUDE_CDS 3605 if (DumpSharedSpaces || RequireSharedSpaces) { 3606 jio_fprintf(defaultStream::error_stream(), 3607 "Shared spaces are not supported in this VM\n"); 3608 return JNI_ERR; 3609 } 3610 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3611 warning("Shared spaces are not supported in this VM"); 3612 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3613 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3614 } 3615 no_shared_spaces(); 3616 #endif // INCLUDE_CDS 3617 3618 return JNI_OK; 3619 } 3620 3621 jint Arguments::apply_ergo() { 3622 3623 // Set flags based on ergonomics. 3624 set_ergonomics_flags(); 3625 3626 set_shared_spaces_flags(); 3627 3628 // Check the GC selections again. 3629 if (!check_gc_consistency()) { 3630 return JNI_EINVAL; 3631 } 3632 3633 if (TieredCompilation) { 3634 set_tiered_flags(); 3635 } else { 3636 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3637 if (CompilationPolicyChoice >= 2) { 3638 vm_exit_during_initialization( 3639 "Incompatible compilation policy selected", NULL); 3640 } 3641 } 3642 3643 // Set heap size based on available physical memory 3644 set_heap_size(); 3645 3646 #if INCLUDE_ALL_GCS 3647 // Set per-collector flags 3648 if (UseParallelGC || UseParallelOldGC) { 3649 set_parallel_gc_flags(); 3650 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3651 set_cms_and_parnew_gc_flags(); 3652 } else if (UseParNewGC) { // skipped if CMS is set above 3653 set_parnew_gc_flags(); 3654 } else if (UseG1GC) { 3655 set_g1_gc_flags(); 3656 } 3657 check_deprecated_gcs(); 3658 check_deprecated_gc_flags(); 3659 if (AssumeMP && !UseSerialGC) { 3660 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3661 warning("If the number of processors is expected to increase from one, then" 3662 " you should configure the number of parallel GC threads appropriately" 3663 " using -XX:ParallelGCThreads=N"); 3664 } 3665 } 3666 #else // INCLUDE_ALL_GCS 3667 assert(verify_serial_gc_flags(), "SerialGC unset"); 3668 #endif // INCLUDE_ALL_GCS 3669 3670 // Set bytecode rewriting flags 3671 set_bytecode_flags(); 3672 3673 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3674 set_aggressive_opts_flags(); 3675 3676 // Turn off biased locking for locking debug mode flags, 3677 // which are subtlely different from each other but neither works with 3678 // biased locking. 3679 if (UseHeavyMonitors 3680 #ifdef COMPILER1 3681 || !UseFastLocking 3682 #endif // COMPILER1 3683 ) { 3684 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3685 // flag set to true on command line; warn the user that they 3686 // can't enable biased locking here 3687 warning("Biased Locking is not supported with locking debug flags" 3688 "; ignoring UseBiasedLocking flag." ); 3689 } 3690 UseBiasedLocking = false; 3691 } 3692 3693 #ifdef CC_INTERP 3694 // Clear flags not supported by the C++ interpreter 3695 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3696 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3697 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3698 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3699 #endif // CC_INTERP 3700 3701 #ifdef COMPILER2 3702 if (!UseBiasedLocking || EmitSync != 0) { 3703 UseOptoBiasInlining = false; 3704 } 3705 if (!EliminateLocks) { 3706 EliminateNestedLocks = false; 3707 } 3708 if (!Inline) { 3709 IncrementalInline = false; 3710 } 3711 #ifndef PRODUCT 3712 if (!IncrementalInline) { 3713 AlwaysIncrementalInline = false; 3714 } 3715 #endif 3716 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3717 // incremental inlining: bump MaxNodeLimit 3718 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3719 } 3720 #endif 3721 3722 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3723 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3724 DebugNonSafepoints = true; 3725 } 3726 3727 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3728 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3729 } 3730 3731 #ifndef PRODUCT 3732 if (CompileTheWorld) { 3733 // Force NmethodSweeper to sweep whole CodeCache each time. 3734 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3735 NmethodSweepFraction = 1; 3736 } 3737 } 3738 3739 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3740 if (use_vm_log()) { 3741 LogVMOutput = true; 3742 } 3743 } 3744 #endif // PRODUCT 3745 3746 if (PrintCommandLineFlags) { 3747 CommandLineFlags::printSetFlags(tty); 3748 } 3749 3750 // Apply CPU specific policy for the BiasedLocking 3751 if (UseBiasedLocking) { 3752 if (!VM_Version::use_biased_locking() && 3753 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3754 UseBiasedLocking = false; 3755 } 3756 } 3757 3758 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3759 // but only if not already set on the commandline 3760 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3761 bool set = false; 3762 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3763 if (!set) { 3764 FLAG_SET_DEFAULT(PauseAtExit, true); 3765 } 3766 } 3767 3768 return JNI_OK; 3769 } 3770 3771 jint Arguments::adjust_after_os() { 3772 #if INCLUDE_ALL_GCS 3773 if (UseParallelGC || UseParallelOldGC) { 3774 if (UseNUMA) { 3775 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3776 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3777 } 3778 // For those collectors or operating systems (eg, Windows) that do 3779 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3780 UseNUMAInterleaving = true; 3781 } 3782 } 3783 #endif // INCLUDE_ALL_GCS 3784 return JNI_OK; 3785 } 3786 3787 int Arguments::PropertyList_count(SystemProperty* pl) { 3788 int count = 0; 3789 while(pl != NULL) { 3790 count++; 3791 pl = pl->next(); 3792 } 3793 return count; 3794 } 3795 3796 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3797 assert(key != NULL, "just checking"); 3798 SystemProperty* prop; 3799 for (prop = pl; prop != NULL; prop = prop->next()) { 3800 if (strcmp(key, prop->key()) == 0) return prop->value(); 3801 } 3802 return NULL; 3803 } 3804 3805 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3806 int count = 0; 3807 const char* ret_val = NULL; 3808 3809 while(pl != NULL) { 3810 if(count >= index) { 3811 ret_val = pl->key(); 3812 break; 3813 } 3814 count++; 3815 pl = pl->next(); 3816 } 3817 3818 return ret_val; 3819 } 3820 3821 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3822 int count = 0; 3823 char* ret_val = NULL; 3824 3825 while(pl != NULL) { 3826 if(count >= index) { 3827 ret_val = pl->value(); 3828 break; 3829 } 3830 count++; 3831 pl = pl->next(); 3832 } 3833 3834 return ret_val; 3835 } 3836 3837 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3838 SystemProperty* p = *plist; 3839 if (p == NULL) { 3840 *plist = new_p; 3841 } else { 3842 while (p->next() != NULL) { 3843 p = p->next(); 3844 } 3845 p->set_next(new_p); 3846 } 3847 } 3848 3849 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3850 if (plist == NULL) 3851 return; 3852 3853 SystemProperty* new_p = new SystemProperty(k, v, true); 3854 PropertyList_add(plist, new_p); 3855 } 3856 3857 // This add maintains unique property key in the list. 3858 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3859 if (plist == NULL) 3860 return; 3861 3862 // If property key exist then update with new value. 3863 SystemProperty* prop; 3864 for (prop = *plist; prop != NULL; prop = prop->next()) { 3865 if (strcmp(k, prop->key()) == 0) { 3866 if (append) { 3867 prop->append_value(v); 3868 } else { 3869 prop->set_value(v); 3870 } 3871 return; 3872 } 3873 } 3874 3875 PropertyList_add(plist, k, v); 3876 } 3877 3878 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3879 // Returns true if all of the source pointed by src has been copied over to 3880 // the destination buffer pointed by buf. Otherwise, returns false. 3881 // Notes: 3882 // 1. If the length (buflen) of the destination buffer excluding the 3883 // NULL terminator character is not long enough for holding the expanded 3884 // pid characters, it also returns false instead of returning the partially 3885 // expanded one. 3886 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3887 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3888 char* buf, size_t buflen) { 3889 const char* p = src; 3890 char* b = buf; 3891 const char* src_end = &src[srclen]; 3892 char* buf_end = &buf[buflen - 1]; 3893 3894 while (p < src_end && b < buf_end) { 3895 if (*p == '%') { 3896 switch (*(++p)) { 3897 case '%': // "%%" ==> "%" 3898 *b++ = *p++; 3899 break; 3900 case 'p': { // "%p" ==> current process id 3901 // buf_end points to the character before the last character so 3902 // that we could write '\0' to the end of the buffer. 3903 size_t buf_sz = buf_end - b + 1; 3904 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3905 3906 // if jio_snprintf fails or the buffer is not long enough to hold 3907 // the expanded pid, returns false. 3908 if (ret < 0 || ret >= (int)buf_sz) { 3909 return false; 3910 } else { 3911 b += ret; 3912 assert(*b == '\0', "fail in copy_expand_pid"); 3913 if (p == src_end && b == buf_end + 1) { 3914 // reach the end of the buffer. 3915 return true; 3916 } 3917 } 3918 p++; 3919 break; 3920 } 3921 default : 3922 *b++ = '%'; 3923 } 3924 } else { 3925 *b++ = *p++; 3926 } 3927 } 3928 *b = '\0'; 3929 return (p == src_end); // return false if not all of the source was copied 3930 }