1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "compiler/compilerOracle.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/cardTableRS.hpp" 31 #include "memory/referenceProcessor.hpp" 32 #include "memory/universe.inline.hpp" 33 #include "oops/oop.inline.hpp" 34 #include "prims/jvmtiExport.hpp" 35 #include "runtime/arguments.hpp" 36 #include "runtime/globals_extension.hpp" 37 #include "runtime/java.hpp" 38 #include "services/management.hpp" 39 #include "services/memTracker.hpp" 40 #include "utilities/defaultStream.hpp" 41 #include "utilities/macros.hpp" 42 #include "utilities/taskqueue.hpp" 43 #ifdef TARGET_OS_FAMILY_linux 44 # include "os_linux.inline.hpp" 45 #endif 46 #ifdef TARGET_OS_FAMILY_solaris 47 # include "os_solaris.inline.hpp" 48 #endif 49 #ifdef TARGET_OS_FAMILY_windows 50 # include "os_windows.inline.hpp" 51 #endif 52 #ifdef TARGET_OS_FAMILY_bsd 53 # include "os_bsd.inline.hpp" 54 #endif 55 #include "memory/genCollectedHeap.hpp" 56 #if INCLUDE_ALL_GCS 57 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 58 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 59 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.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::_largest_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 size_t aligned_null_page_size = align_size_up_(os::vm_page_size(), Arguments::largest_heap_alignment()); 1402 1403 LP64_ONLY(return OopEncodingHeapMax - aligned_null_page_size); 1404 NOT_LP64(ShouldNotReachHere(); return 0); 1405 } 1406 1407 bool Arguments::should_auto_select_low_pause_collector() { 1408 if (UseAutoGCSelectPolicy && 1409 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1410 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1411 if (PrintGCDetails) { 1412 // Cannot use gclog_or_tty yet. 1413 tty->print_cr("Automatic selection of the low pause collector" 1414 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1415 } 1416 return true; 1417 } 1418 return false; 1419 } 1420 1421 void Arguments::set_use_compressed_oops() { 1422 #ifndef ZERO 1423 #ifdef _LP64 1424 // MaxHeapSize is not set up properly at this point, but 1425 // the only value that can override MaxHeapSize if we are 1426 // to use UseCompressedOops is InitialHeapSize. 1427 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1428 1429 if (max_heap_size <= max_heap_for_compressed_oops()) { 1430 #if !defined(COMPILER1) || defined(TIERED) 1431 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1432 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1433 } 1434 #endif 1435 #ifdef _WIN64 1436 if (UseLargePages && UseCompressedOops) { 1437 // Cannot allocate guard pages for implicit checks in indexed addressing 1438 // mode, when large pages are specified on windows. 1439 // This flag could be switched ON if narrow oop base address is set to 0, 1440 // see code in Universe::initialize_heap(). 1441 Universe::set_narrow_oop_use_implicit_null_checks(false); 1442 } 1443 #endif // _WIN64 1444 } else { 1445 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1446 warning("Max heap size too large for Compressed Oops"); 1447 FLAG_SET_DEFAULT(UseCompressedOops, false); 1448 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1449 } 1450 } 1451 #endif // _LP64 1452 #endif // ZERO 1453 } 1454 1455 1456 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1457 // set_use_compressed_oops(). 1458 void Arguments::set_use_compressed_klass_ptrs() { 1459 #ifndef ZERO 1460 #ifdef _LP64 1461 // UseCompressedOops must be on for UseCompressedKlassPointers to be on. 1462 if (!UseCompressedOops) { 1463 if (UseCompressedKlassPointers) { 1464 warning("UseCompressedKlassPointers requires UseCompressedOops"); 1465 } 1466 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1467 } else { 1468 // Turn on UseCompressedKlassPointers too 1469 if (FLAG_IS_DEFAULT(UseCompressedKlassPointers)) { 1470 FLAG_SET_ERGO(bool, UseCompressedKlassPointers, true); 1471 } 1472 // Check the ClassMetaspaceSize to make sure we use compressed klass ptrs. 1473 if (UseCompressedKlassPointers) { 1474 if (ClassMetaspaceSize > KlassEncodingMetaspaceMax) { 1475 warning("Class metaspace size is too large for UseCompressedKlassPointers"); 1476 FLAG_SET_DEFAULT(UseCompressedKlassPointers, false); 1477 } 1478 } 1479 } 1480 #endif // _LP64 1481 #endif // !ZERO 1482 } 1483 1484 void Arguments::set_largest_max_heap_alignment() { 1485 size_t gc_alignment; 1486 #if INCLUDE_ALL_GCS 1487 if (UseParallelGC) { 1488 gc_alignment = ParallelScavengeHeap::max_heap_alignment(); 1489 } else if (UseG1GC) { 1490 gc_alignment = G1CollectedHeap::max_heap_alignment(); 1491 } else { 1492 #endif // INCLUDE_ALL_GCS 1493 gc_alignment = GenCollectedHeap::max_heap_alignment(); 1494 #if INCLUDE_ALL_GCS 1495 } 1496 #endif // INCLUDE_ALL_GCS 1497 _largest_heap_alignment = MAX3(gc_alignment, os::max_page_size(), 1498 CollectorPolicy::compute_largest_heap_alignment()); 1499 } 1500 1501 void Arguments::set_ergonomics_flags() { 1502 1503 if (os::is_server_class_machine()) { 1504 // If no other collector is requested explicitly, 1505 // let the VM select the collector based on 1506 // machine class and automatic selection policy. 1507 if (!UseSerialGC && 1508 !UseConcMarkSweepGC && 1509 !UseG1GC && 1510 !UseParNewGC && 1511 FLAG_IS_DEFAULT(UseParallelGC)) { 1512 if (should_auto_select_low_pause_collector()) { 1513 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1514 } else { 1515 FLAG_SET_ERGO(bool, UseParallelGC, true); 1516 } 1517 } 1518 // Shared spaces work fine with other GCs but causes bytecode rewriting 1519 // to be disabled, which hurts interpreter performance and decreases 1520 // server performance. On server class machines, keep the default 1521 // off unless it is asked for. Future work: either add bytecode rewriting 1522 // at link time, or rewrite bytecodes in non-shared methods. 1523 if (!DumpSharedSpaces && !RequireSharedSpaces && 1524 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1525 no_shared_spaces(); 1526 } 1527 } 1528 1529 set_largest_max_heap_alignment(); 1530 1531 #ifndef ZERO 1532 #ifdef _LP64 1533 set_use_compressed_oops(); 1534 1535 // set_use_compressed_klass_ptrs() must be called after calling 1536 // set_use_compressed_oops(). 1537 set_use_compressed_klass_ptrs(); 1538 1539 // Also checks that certain machines are slower with compressed oops 1540 // in vm_version initialization code. 1541 #endif // _LP64 1542 #endif // !ZERO 1543 } 1544 1545 void Arguments::set_parallel_gc_flags() { 1546 assert(UseParallelGC || UseParallelOldGC, "Error"); 1547 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1548 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1549 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1550 } 1551 FLAG_SET_DEFAULT(UseParallelGC, true); 1552 1553 // If no heap maximum was requested explicitly, use some reasonable fraction 1554 // of the physical memory, up to a maximum of 1GB. 1555 FLAG_SET_DEFAULT(ParallelGCThreads, 1556 Abstract_VM_Version::parallel_worker_threads()); 1557 if (ParallelGCThreads == 0) { 1558 jio_fprintf(defaultStream::error_stream(), 1559 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1560 vm_exit(1); 1561 } 1562 1563 1564 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1565 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1566 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1567 // See CR 6362902 for details. 1568 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1569 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1570 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1571 } 1572 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1573 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1574 } 1575 } 1576 1577 if (UseParallelOldGC) { 1578 // Par compact uses lower default values since they are treated as 1579 // minimums. These are different defaults because of the different 1580 // interpretation and are not ergonomically set. 1581 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1582 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1583 } 1584 } 1585 } 1586 1587 void Arguments::set_g1_gc_flags() { 1588 assert(UseG1GC, "Error"); 1589 #ifdef COMPILER1 1590 FastTLABRefill = false; 1591 #endif 1592 FLAG_SET_DEFAULT(ParallelGCThreads, 1593 Abstract_VM_Version::parallel_worker_threads()); 1594 if (ParallelGCThreads == 0) { 1595 FLAG_SET_DEFAULT(ParallelGCThreads, 1596 Abstract_VM_Version::parallel_worker_threads()); 1597 } 1598 1599 // MarkStackSize will be set (if it hasn't been set by the user) 1600 // when concurrent marking is initialized. 1601 // Its value will be based upon the number of parallel marking threads. 1602 // But we do set the maximum mark stack size here. 1603 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1604 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1605 } 1606 1607 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1608 // In G1, we want the default GC overhead goal to be higher than 1609 // say in PS. So we set it here to 10%. Otherwise the heap might 1610 // be expanded more aggressively than we would like it to. In 1611 // fact, even 10% seems to not be high enough in some cases 1612 // (especially small GC stress tests that the main thing they do 1613 // is allocation). We might consider increase it further. 1614 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1615 } 1616 1617 if (PrintGCDetails && Verbose) { 1618 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1619 MarkStackSize / K, MarkStackSizeMax / K); 1620 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1621 } 1622 } 1623 1624 julong Arguments::limit_by_allocatable_memory(julong limit) { 1625 julong max_allocatable; 1626 julong result = limit; 1627 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1628 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1629 } 1630 return result; 1631 } 1632 1633 void Arguments::set_heap_base_min_address() { 1634 if (FLAG_IS_DEFAULT(HeapBaseMinAddress) && UseG1GC && HeapBaseMinAddress < 1*G) { 1635 // By default HeapBaseMinAddress is 2G on all platforms except Solaris x86. 1636 // G1 currently needs a lot of C-heap, so on Solaris we have to give G1 1637 // some extra space for the C-heap compared to other collectors. 1638 // Use FLAG_SET_DEFAULT here rather than FLAG_SET_ERGO to make sure that 1639 // code that checks for default values work correctly. 1640 FLAG_SET_DEFAULT(HeapBaseMinAddress, 1*G); 1641 } 1642 } 1643 1644 void Arguments::set_heap_size() { 1645 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1646 // Deprecated flag 1647 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1648 } 1649 1650 const julong phys_mem = 1651 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1652 : (julong)MaxRAM; 1653 1654 // If the maximum heap size has not been set with -Xmx, 1655 // then set it as fraction of the size of physical memory, 1656 // respecting the maximum and minimum sizes of the heap. 1657 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1658 julong reasonable_max = phys_mem / MaxRAMFraction; 1659 1660 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1661 // Small physical memory, so use a minimum fraction of it for the heap 1662 reasonable_max = phys_mem / MinRAMFraction; 1663 } else { 1664 // Not-small physical memory, so require a heap at least 1665 // as large as MaxHeapSize 1666 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1667 } 1668 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1669 // Limit the heap size to ErgoHeapSizeLimit 1670 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1671 } 1672 if (UseCompressedOops) { 1673 // Limit the heap size to the maximum possible when using compressed oops 1674 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1675 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1676 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1677 // but it should be not less than default MaxHeapSize. 1678 max_coop_heap -= HeapBaseMinAddress; 1679 } 1680 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1681 } 1682 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1683 1684 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1685 // An initial heap size was specified on the command line, 1686 // so be sure that the maximum size is consistent. Done 1687 // after call to limit_by_allocatable_memory because that 1688 // method might reduce the allocation size. 1689 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1690 } 1691 1692 if (PrintGCDetails && Verbose) { 1693 // Cannot use gclog_or_tty yet. 1694 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1695 } 1696 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1697 } 1698 1699 // If the minimum or initial heap_size have not been set or requested to be set 1700 // ergonomically, set them accordingly. 1701 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1702 julong reasonable_minimum = (julong)(OldSize + NewSize); 1703 1704 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1705 1706 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1707 1708 if (InitialHeapSize == 0) { 1709 julong reasonable_initial = phys_mem / InitialRAMFraction; 1710 1711 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1712 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1713 1714 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1715 1716 if (PrintGCDetails && Verbose) { 1717 // Cannot use gclog_or_tty yet. 1718 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1719 } 1720 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1721 } 1722 // If the minimum heap size has not been set (via -Xms), 1723 // synchronize with InitialHeapSize to avoid errors with the default value. 1724 if (min_heap_size() == 0) { 1725 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1726 if (PrintGCDetails && Verbose) { 1727 // Cannot use gclog_or_tty yet. 1728 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1729 } 1730 } 1731 } 1732 } 1733 1734 // This must be called after ergonomics because we want bytecode rewriting 1735 // if the server compiler is used, or if UseSharedSpaces is disabled. 1736 void Arguments::set_bytecode_flags() { 1737 // Better not attempt to store into a read-only space. 1738 if (UseSharedSpaces) { 1739 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1740 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1741 } 1742 1743 if (!RewriteBytecodes) { 1744 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1745 } 1746 } 1747 1748 // Aggressive optimization flags -XX:+AggressiveOpts 1749 void Arguments::set_aggressive_opts_flags() { 1750 #ifdef COMPILER2 1751 if (AggressiveUnboxing) { 1752 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1753 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1754 } else if (!EliminateAutoBox) { 1755 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1756 AggressiveUnboxing = false; 1757 } 1758 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1759 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1760 } else if (!DoEscapeAnalysis) { 1761 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1762 AggressiveUnboxing = false; 1763 } 1764 } 1765 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1766 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1767 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1768 } 1769 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1770 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1771 } 1772 1773 // Feed the cache size setting into the JDK 1774 char buffer[1024]; 1775 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1776 add_property(buffer); 1777 } 1778 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1779 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1780 } 1781 #endif 1782 1783 if (AggressiveOpts) { 1784 // Sample flag setting code 1785 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1786 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1787 // } 1788 } 1789 } 1790 1791 //=========================================================================================================== 1792 // Parsing of java.compiler property 1793 1794 void Arguments::process_java_compiler_argument(char* arg) { 1795 // For backwards compatibility, Djava.compiler=NONE or "" 1796 // causes us to switch to -Xint mode UNLESS -Xdebug 1797 // is also specified. 1798 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1799 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1800 } 1801 } 1802 1803 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1804 _sun_java_launcher = strdup(launcher); 1805 if (strcmp("gamma", _sun_java_launcher) == 0) { 1806 _created_by_gamma_launcher = true; 1807 } 1808 } 1809 1810 bool Arguments::created_by_java_launcher() { 1811 assert(_sun_java_launcher != NULL, "property must have value"); 1812 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1813 } 1814 1815 bool Arguments::created_by_gamma_launcher() { 1816 return _created_by_gamma_launcher; 1817 } 1818 1819 //=========================================================================================================== 1820 // Parsing of main arguments 1821 1822 bool Arguments::verify_interval(uintx val, uintx min, 1823 uintx max, const char* name) { 1824 // Returns true iff value is in the inclusive interval [min..max] 1825 // false, otherwise. 1826 if (val >= min && val <= max) { 1827 return true; 1828 } 1829 jio_fprintf(defaultStream::error_stream(), 1830 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1831 " and " UINTX_FORMAT "\n", 1832 name, val, min, max); 1833 return false; 1834 } 1835 1836 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1837 // Returns true if given value is at least specified min threshold 1838 // false, otherwise. 1839 if (val >= min ) { 1840 return true; 1841 } 1842 jio_fprintf(defaultStream::error_stream(), 1843 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1844 name, val, min); 1845 return false; 1846 } 1847 1848 bool Arguments::verify_percentage(uintx value, const char* name) { 1849 if (value <= 100) { 1850 return true; 1851 } 1852 jio_fprintf(defaultStream::error_stream(), 1853 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1854 name, value); 1855 return false; 1856 } 1857 1858 #if !INCLUDE_ALL_GCS 1859 #ifdef ASSERT 1860 static bool verify_serial_gc_flags() { 1861 return (UseSerialGC && 1862 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1863 UseParallelGC || UseParallelOldGC)); 1864 } 1865 #endif // ASSERT 1866 #endif // INCLUDE_ALL_GCS 1867 1868 // check if do gclog rotation 1869 // +UseGCLogFileRotation is a must, 1870 // no gc log rotation when log file not supplied or 1871 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1872 void check_gclog_consistency() { 1873 if (UseGCLogFileRotation) { 1874 if ((Arguments::gc_log_filename() == NULL) || 1875 (NumberOfGCLogFiles == 0) || 1876 (GCLogFileSize == 0)) { 1877 jio_fprintf(defaultStream::output_stream(), 1878 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1879 "where num_of_file > 0 and num_of_size > 0\n" 1880 "GC log rotation is turned off\n"); 1881 UseGCLogFileRotation = false; 1882 } 1883 } 1884 1885 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1886 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1887 jio_fprintf(defaultStream::output_stream(), 1888 "GCLogFileSize changed to minimum 8K\n"); 1889 } 1890 } 1891 1892 // Check consistency of GC selection 1893 bool Arguments::check_gc_consistency() { 1894 check_gclog_consistency(); 1895 bool status = true; 1896 // Ensure that the user has not selected conflicting sets 1897 // of collectors. [Note: this check is merely a user convenience; 1898 // collectors over-ride each other so that only a non-conflicting 1899 // set is selected; however what the user gets is not what they 1900 // may have expected from the combination they asked for. It's 1901 // better to reduce user confusion by not allowing them to 1902 // select conflicting combinations. 1903 uint i = 0; 1904 if (UseSerialGC) i++; 1905 if (UseConcMarkSweepGC || UseParNewGC) i++; 1906 if (UseParallelGC || UseParallelOldGC) i++; 1907 if (UseG1GC) i++; 1908 if (i > 1) { 1909 jio_fprintf(defaultStream::error_stream(), 1910 "Conflicting collector combinations in option list; " 1911 "please refer to the release notes for the combinations " 1912 "allowed\n"); 1913 status = false; 1914 } else if (ReservedCodeCacheSize > 2*G) { 1915 // Code cache size larger than MAXINT is not supported. 1916 jio_fprintf(defaultStream::error_stream(), 1917 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 1918 (2*G)/M); 1919 status = false; 1920 } 1921 return status; 1922 } 1923 1924 void Arguments::check_deprecated_gcs() { 1925 if (UseConcMarkSweepGC && !UseParNewGC) { 1926 warning("Using the DefNew young collector with the CMS collector is deprecated " 1927 "and will likely be removed in a future release"); 1928 } 1929 1930 if (UseParNewGC && !UseConcMarkSweepGC) { 1931 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1932 // set up UseSerialGC properly, so that can't be used in the check here. 1933 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1934 "and will likely be removed in a future release"); 1935 } 1936 1937 if (CMSIncrementalMode) { 1938 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1939 } 1940 } 1941 1942 void Arguments::check_deprecated_gc_flags() { 1943 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1944 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1945 "and will likely be removed in future release"); 1946 } 1947 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 1948 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 1949 "Use MaxRAMFraction instead."); 1950 } 1951 } 1952 1953 // Check stack pages settings 1954 bool Arguments::check_stack_pages() 1955 { 1956 bool status = true; 1957 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1958 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1959 // greater stack shadow pages can't generate instruction to bang stack 1960 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1961 return status; 1962 } 1963 1964 // Check the consistency of vm_init_args 1965 bool Arguments::check_vm_args_consistency() { 1966 // Method for adding checks for flag consistency. 1967 // The intent is to warn the user of all possible conflicts, 1968 // before returning an error. 1969 // Note: Needs platform-dependent factoring. 1970 bool status = true; 1971 1972 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1973 // builds so the cost of stack banging can be measured. 1974 #if (defined(PRODUCT) && defined(SOLARIS)) 1975 if (!UseBoundThreads && !UseStackBanging) { 1976 jio_fprintf(defaultStream::error_stream(), 1977 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1978 1979 status = false; 1980 } 1981 #endif 1982 1983 if (TLABRefillWasteFraction == 0) { 1984 jio_fprintf(defaultStream::error_stream(), 1985 "TLABRefillWasteFraction should be a denominator, " 1986 "not " SIZE_FORMAT "\n", 1987 TLABRefillWasteFraction); 1988 status = false; 1989 } 1990 1991 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 1992 "AdaptiveSizePolicyWeight"); 1993 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1994 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1995 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1996 1997 // Divide by bucket size to prevent a large size from causing rollover when 1998 // calculating amount of memory needed to be allocated for the String table. 1999 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2000 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2001 2002 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 2003 jio_fprintf(defaultStream::error_stream(), 2004 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2005 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 2006 MinHeapFreeRatio, MaxHeapFreeRatio); 2007 status = false; 2008 } 2009 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2010 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 2011 2012 // Min/MaxMetaspaceFreeRatio 2013 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2014 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2015 2016 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2017 jio_fprintf(defaultStream::error_stream(), 2018 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2019 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2020 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2021 MinMetaspaceFreeRatio, 2022 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2023 MaxMetaspaceFreeRatio); 2024 status = false; 2025 } 2026 2027 // Trying to keep 100% free is not practical 2028 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2029 2030 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2031 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2032 } 2033 2034 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2035 // Settings to encourage splitting. 2036 if (!FLAG_IS_CMDLINE(NewRatio)) { 2037 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2038 } 2039 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2040 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2041 } 2042 } 2043 2044 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2045 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2046 if (GCTimeLimit == 100) { 2047 // Turn off gc-overhead-limit-exceeded checks 2048 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2049 } 2050 2051 status = status && check_gc_consistency(); 2052 status = status && check_stack_pages(); 2053 2054 if (CMSIncrementalMode) { 2055 if (!UseConcMarkSweepGC) { 2056 jio_fprintf(defaultStream::error_stream(), 2057 "error: invalid argument combination.\n" 2058 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2059 "selected in order\nto use CMSIncrementalMode.\n"); 2060 status = false; 2061 } else { 2062 status = status && verify_percentage(CMSIncrementalDutyCycle, 2063 "CMSIncrementalDutyCycle"); 2064 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2065 "CMSIncrementalDutyCycleMin"); 2066 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2067 "CMSIncrementalSafetyFactor"); 2068 status = status && verify_percentage(CMSIncrementalOffset, 2069 "CMSIncrementalOffset"); 2070 status = status && verify_percentage(CMSExpAvgFactor, 2071 "CMSExpAvgFactor"); 2072 // If it was not set on the command line, set 2073 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2074 if (CMSInitiatingOccupancyFraction < 0) { 2075 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2076 } 2077 } 2078 } 2079 2080 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2081 // insists that we hold the requisite locks so that the iteration is 2082 // MT-safe. For the verification at start-up and shut-down, we don't 2083 // yet have a good way of acquiring and releasing these locks, 2084 // which are not visible at the CollectedHeap level. We want to 2085 // be able to acquire these locks and then do the iteration rather 2086 // than just disable the lock verification. This will be fixed under 2087 // bug 4788986. 2088 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2089 if (VerifyDuringStartup) { 2090 warning("Heap verification at start-up disabled " 2091 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2092 VerifyDuringStartup = false; // Disable verification at start-up 2093 } 2094 2095 if (VerifyBeforeExit) { 2096 warning("Heap verification at shutdown disabled " 2097 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2098 VerifyBeforeExit = false; // Disable verification at shutdown 2099 } 2100 } 2101 2102 // Note: only executed in non-PRODUCT mode 2103 if (!UseAsyncConcMarkSweepGC && 2104 (ExplicitGCInvokesConcurrent || 2105 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2106 jio_fprintf(defaultStream::error_stream(), 2107 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2108 " with -UseAsyncConcMarkSweepGC"); 2109 status = false; 2110 } 2111 2112 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2113 2114 #if INCLUDE_ALL_GCS 2115 if (UseG1GC) { 2116 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2117 "InitiatingHeapOccupancyPercent"); 2118 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2119 "G1RefProcDrainInterval"); 2120 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2121 "G1ConcMarkStepDurationMillis"); 2122 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2123 "G1ConcRSHotCardLimit"); 2124 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2125 "G1ConcRSLogCacheSize"); 2126 } 2127 if (UseConcMarkSweepGC) { 2128 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2129 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2130 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2131 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2132 2133 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2134 2135 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2136 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2137 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2138 2139 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2140 2141 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2142 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2143 2144 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2145 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2146 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2147 2148 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2149 2150 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2151 2152 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2153 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2154 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2155 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2156 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2157 } 2158 2159 if (UseParallelGC || UseParallelOldGC) { 2160 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2161 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2162 2163 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2164 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2165 2166 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2167 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2168 2169 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2170 2171 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2172 } 2173 #endif // INCLUDE_ALL_GCS 2174 2175 status = status && verify_interval(RefDiscoveryPolicy, 2176 ReferenceProcessor::DiscoveryPolicyMin, 2177 ReferenceProcessor::DiscoveryPolicyMax, 2178 "RefDiscoveryPolicy"); 2179 2180 // Limit the lower bound of this flag to 1 as it is used in a division 2181 // expression. 2182 status = status && verify_interval(TLABWasteTargetPercent, 2183 1, 100, "TLABWasteTargetPercent"); 2184 2185 status = status && verify_object_alignment(); 2186 2187 status = status && verify_interval(ClassMetaspaceSize, 1*M, 3*G, 2188 "ClassMetaspaceSize"); 2189 2190 status = status && verify_interval(MarkStackSizeMax, 2191 1, (max_jint - 1), "MarkStackSizeMax"); 2192 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2193 2194 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2195 2196 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2197 2198 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2199 2200 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2201 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2202 2203 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2204 2205 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2206 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2207 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2208 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2209 2210 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2211 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2212 2213 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2214 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2215 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2216 2217 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2218 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2219 2220 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2221 // just for that, so hardcode here. 2222 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2223 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2224 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2225 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2226 2227 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2228 #ifdef SPARC 2229 if (UseConcMarkSweepGC || UseG1GC) { 2230 // Issue a stern warning if the user has explicitly set 2231 // UseMemSetInBOT (it is known to cause issues), but allow 2232 // use for experimentation and debugging. 2233 if (VM_Version::is_sun4v() && UseMemSetInBOT) { 2234 assert(!FLAG_IS_DEFAULT(UseMemSetInBOT), "Error"); 2235 warning("Experimental flag -XX:+UseMemSetInBOT is known to cause instability" 2236 " on sun4v; please understand that you are using at your own risk!"); 2237 } 2238 } 2239 #endif // SPARC 2240 2241 if (PrintNMTStatistics) { 2242 #if INCLUDE_NMT 2243 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2244 #endif // INCLUDE_NMT 2245 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2246 PrintNMTStatistics = false; 2247 #if INCLUDE_NMT 2248 } 2249 #endif 2250 } 2251 2252 // Need to limit the extent of the padding to reasonable size. 2253 // 8K is well beyond the reasonable HW cache line size, even with the 2254 // aggressive prefetching, while still leaving the room for segregating 2255 // among the distinct pages. 2256 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2257 jio_fprintf(defaultStream::error_stream(), 2258 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2259 ContendedPaddingWidth, 0, 8192); 2260 status = false; 2261 } 2262 2263 // Need to enforce the padding not to break the existing field alignments. 2264 // It is sufficient to check against the largest type size. 2265 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2266 jio_fprintf(defaultStream::error_stream(), 2267 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2268 ContendedPaddingWidth, BytesPerLong); 2269 status = false; 2270 } 2271 2272 // Check lower bounds of the code cache 2273 // Template Interpreter code is approximately 3X larger in debug builds. 2274 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2275 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2276 jio_fprintf(defaultStream::error_stream(), 2277 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2278 os::vm_page_size()/K); 2279 status = false; 2280 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2281 jio_fprintf(defaultStream::error_stream(), 2282 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2283 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2284 status = false; 2285 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2286 jio_fprintf(defaultStream::error_stream(), 2287 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2288 min_code_cache_size/K); 2289 status = false; 2290 } else if (ReservedCodeCacheSize > 2*G) { 2291 // Code cache size larger than MAXINT is not supported. 2292 jio_fprintf(defaultStream::error_stream(), 2293 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2294 (2*G)/M); 2295 status = false; 2296 } 2297 return status; 2298 } 2299 2300 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2301 const char* option_type) { 2302 if (ignore) return false; 2303 2304 const char* spacer = " "; 2305 if (option_type == NULL) { 2306 option_type = ++spacer; // Set both to the empty string. 2307 } 2308 2309 if (os::obsolete_option(option)) { 2310 jio_fprintf(defaultStream::error_stream(), 2311 "Obsolete %s%soption: %s\n", option_type, spacer, 2312 option->optionString); 2313 return false; 2314 } else { 2315 jio_fprintf(defaultStream::error_stream(), 2316 "Unrecognized %s%soption: %s\n", option_type, spacer, 2317 option->optionString); 2318 return true; 2319 } 2320 } 2321 2322 static const char* user_assertion_options[] = { 2323 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2324 }; 2325 2326 static const char* system_assertion_options[] = { 2327 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2328 }; 2329 2330 // Return true if any of the strings in null-terminated array 'names' matches. 2331 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2332 // the option must match exactly. 2333 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2334 bool tail_allowed) { 2335 for (/* empty */; *names != NULL; ++names) { 2336 if (match_option(option, *names, tail)) { 2337 if (**tail == '\0' || tail_allowed && **tail == ':') { 2338 return true; 2339 } 2340 } 2341 } 2342 return false; 2343 } 2344 2345 bool Arguments::parse_uintx(const char* value, 2346 uintx* uintx_arg, 2347 uintx min_size) { 2348 2349 // Check the sign first since atomull() parses only unsigned values. 2350 bool value_is_positive = !(*value == '-'); 2351 2352 if (value_is_positive) { 2353 julong n; 2354 bool good_return = atomull(value, &n); 2355 if (good_return) { 2356 bool above_minimum = n >= min_size; 2357 bool value_is_too_large = n > max_uintx; 2358 2359 if (above_minimum && !value_is_too_large) { 2360 *uintx_arg = n; 2361 return true; 2362 } 2363 } 2364 } 2365 return false; 2366 } 2367 2368 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2369 julong* long_arg, 2370 julong min_size) { 2371 if (!atomull(s, long_arg)) return arg_unreadable; 2372 return check_memory_size(*long_arg, min_size); 2373 } 2374 2375 // Parse JavaVMInitArgs structure 2376 2377 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2378 // For components of the system classpath. 2379 SysClassPath scp(Arguments::get_sysclasspath()); 2380 bool scp_assembly_required = false; 2381 2382 // Save default settings for some mode flags 2383 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2384 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2385 Arguments::_ClipInlining = ClipInlining; 2386 Arguments::_BackgroundCompilation = BackgroundCompilation; 2387 2388 // Setup flags for mixed which is the default 2389 set_mode_flags(_mixed); 2390 2391 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2392 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2393 if (result != JNI_OK) { 2394 return result; 2395 } 2396 2397 // Parse JavaVMInitArgs structure passed in 2398 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2399 if (result != JNI_OK) { 2400 return result; 2401 } 2402 2403 if (AggressiveOpts) { 2404 // Insert alt-rt.jar between user-specified bootclasspath 2405 // prefix and the default bootclasspath. os::set_boot_path() 2406 // uses meta_index_dir as the default bootclasspath directory. 2407 const char* altclasses_jar = "alt-rt.jar"; 2408 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2409 strlen(altclasses_jar); 2410 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len, mtInternal); 2411 strcpy(altclasses_path, get_meta_index_dir()); 2412 strcat(altclasses_path, altclasses_jar); 2413 scp.add_suffix_to_prefix(altclasses_path); 2414 scp_assembly_required = true; 2415 FREE_C_HEAP_ARRAY(char, altclasses_path, mtInternal); 2416 } 2417 2418 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2419 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2420 if (result != JNI_OK) { 2421 return result; 2422 } 2423 2424 // Do final processing now that all arguments have been parsed 2425 result = finalize_vm_init_args(&scp, scp_assembly_required); 2426 if (result != JNI_OK) { 2427 return result; 2428 } 2429 2430 return JNI_OK; 2431 } 2432 2433 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2434 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2435 // are dealing with -agentpath (case where name is a path), otherwise with 2436 // -agentlib 2437 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2438 char *_name; 2439 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2440 size_t _len_hprof, _len_jdwp, _len_prefix; 2441 2442 if (is_path) { 2443 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2444 return false; 2445 } 2446 2447 _name++; // skip past last path separator 2448 _len_prefix = strlen(JNI_LIB_PREFIX); 2449 2450 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2451 return false; 2452 } 2453 2454 _name += _len_prefix; 2455 _len_hprof = strlen(_hprof); 2456 _len_jdwp = strlen(_jdwp); 2457 2458 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2459 _name += _len_hprof; 2460 } 2461 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2462 _name += _len_jdwp; 2463 } 2464 else { 2465 return false; 2466 } 2467 2468 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2469 return false; 2470 } 2471 2472 return true; 2473 } 2474 2475 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2476 return true; 2477 } 2478 2479 return false; 2480 } 2481 2482 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2483 SysClassPath* scp_p, 2484 bool* scp_assembly_required_p, 2485 FlagValueOrigin origin) { 2486 // Remaining part of option string 2487 const char* tail; 2488 2489 // iterate over arguments 2490 for (int index = 0; index < args->nOptions; index++) { 2491 bool is_absolute_path = false; // for -agentpath vs -agentlib 2492 2493 const JavaVMOption* option = args->options + index; 2494 2495 if (!match_option(option, "-Djava.class.path", &tail) && 2496 !match_option(option, "-Dsun.java.command", &tail) && 2497 !match_option(option, "-Dsun.java.launcher", &tail)) { 2498 2499 // add all jvm options to the jvm_args string. This string 2500 // is used later to set the java.vm.args PerfData string constant. 2501 // the -Djava.class.path and the -Dsun.java.command options are 2502 // omitted from jvm_args string as each have their own PerfData 2503 // string constant object. 2504 build_jvm_args(option->optionString); 2505 } 2506 2507 // -verbose:[class/gc/jni] 2508 if (match_option(option, "-verbose", &tail)) { 2509 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2510 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2511 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2512 } else if (!strcmp(tail, ":gc")) { 2513 FLAG_SET_CMDLINE(bool, PrintGC, true); 2514 } else if (!strcmp(tail, ":jni")) { 2515 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2516 } 2517 // -da / -ea / -disableassertions / -enableassertions 2518 // These accept an optional class/package name separated by a colon, e.g., 2519 // -da:java.lang.Thread. 2520 } else if (match_option(option, user_assertion_options, &tail, true)) { 2521 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2522 if (*tail == '\0') { 2523 JavaAssertions::setUserClassDefault(enable); 2524 } else { 2525 assert(*tail == ':', "bogus match by match_option()"); 2526 JavaAssertions::addOption(tail + 1, enable); 2527 } 2528 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2529 } else if (match_option(option, system_assertion_options, &tail, false)) { 2530 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2531 JavaAssertions::setSystemClassDefault(enable); 2532 // -bootclasspath: 2533 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2534 scp_p->reset_path(tail); 2535 *scp_assembly_required_p = true; 2536 // -bootclasspath/a: 2537 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2538 scp_p->add_suffix(tail); 2539 *scp_assembly_required_p = true; 2540 // -bootclasspath/p: 2541 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2542 scp_p->add_prefix(tail); 2543 *scp_assembly_required_p = true; 2544 // -Xrun 2545 } else if (match_option(option, "-Xrun", &tail)) { 2546 if (tail != NULL) { 2547 const char* pos = strchr(tail, ':'); 2548 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2549 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2550 name[len] = '\0'; 2551 2552 char *options = NULL; 2553 if(pos != NULL) { 2554 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2555 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2556 } 2557 #if !INCLUDE_JVMTI 2558 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2559 jio_fprintf(defaultStream::error_stream(), 2560 "Profiling and debugging agents are not supported in this VM\n"); 2561 return JNI_ERR; 2562 } 2563 #endif // !INCLUDE_JVMTI 2564 add_init_library(name, options); 2565 } 2566 // -agentlib and -agentpath 2567 } else if (match_option(option, "-agentlib:", &tail) || 2568 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2569 if(tail != NULL) { 2570 const char* pos = strchr(tail, '='); 2571 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2572 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2573 name[len] = '\0'; 2574 2575 char *options = NULL; 2576 if(pos != NULL) { 2577 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2578 } 2579 #if !INCLUDE_JVMTI 2580 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2581 jio_fprintf(defaultStream::error_stream(), 2582 "Profiling and debugging agents are not supported in this VM\n"); 2583 return JNI_ERR; 2584 } 2585 #endif // !INCLUDE_JVMTI 2586 add_init_agent(name, options, is_absolute_path); 2587 } 2588 // -javaagent 2589 } else if (match_option(option, "-javaagent:", &tail)) { 2590 #if !INCLUDE_JVMTI 2591 jio_fprintf(defaultStream::error_stream(), 2592 "Instrumentation agents are not supported in this VM\n"); 2593 return JNI_ERR; 2594 #else 2595 if(tail != NULL) { 2596 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2597 add_init_agent("instrument", options, false); 2598 } 2599 #endif // !INCLUDE_JVMTI 2600 // -Xnoclassgc 2601 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2602 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2603 // -Xincgc: i-CMS 2604 } else if (match_option(option, "-Xincgc", &tail)) { 2605 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2606 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2607 // -Xnoincgc: no i-CMS 2608 } else if (match_option(option, "-Xnoincgc", &tail)) { 2609 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2610 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2611 // -Xconcgc 2612 } else if (match_option(option, "-Xconcgc", &tail)) { 2613 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2614 // -Xnoconcgc 2615 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2616 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2617 // -Xbatch 2618 } else if (match_option(option, "-Xbatch", &tail)) { 2619 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2620 // -Xmn for compatibility with other JVM vendors 2621 } else if (match_option(option, "-Xmn", &tail)) { 2622 julong long_initial_eden_size = 0; 2623 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2624 if (errcode != arg_in_range) { 2625 jio_fprintf(defaultStream::error_stream(), 2626 "Invalid initial eden size: %s\n", option->optionString); 2627 describe_range_error(errcode); 2628 return JNI_EINVAL; 2629 } 2630 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2631 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2632 // -Xms 2633 } else if (match_option(option, "-Xms", &tail)) { 2634 julong long_initial_heap_size = 0; 2635 // an initial heap size of 0 means automatically determine 2636 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2637 if (errcode != arg_in_range) { 2638 jio_fprintf(defaultStream::error_stream(), 2639 "Invalid initial heap size: %s\n", option->optionString); 2640 describe_range_error(errcode); 2641 return JNI_EINVAL; 2642 } 2643 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2644 // Currently the minimum size and the initial heap sizes are the same. 2645 set_min_heap_size(InitialHeapSize); 2646 // -Xmx 2647 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2648 julong long_max_heap_size = 0; 2649 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2650 if (errcode != arg_in_range) { 2651 jio_fprintf(defaultStream::error_stream(), 2652 "Invalid maximum heap size: %s\n", option->optionString); 2653 describe_range_error(errcode); 2654 return JNI_EINVAL; 2655 } 2656 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2657 // Xmaxf 2658 } else if (match_option(option, "-Xmaxf", &tail)) { 2659 int maxf = (int)(atof(tail) * 100); 2660 if (maxf < 0 || maxf > 100) { 2661 jio_fprintf(defaultStream::error_stream(), 2662 "Bad max heap free percentage size: %s\n", 2663 option->optionString); 2664 return JNI_EINVAL; 2665 } else { 2666 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2667 } 2668 // Xminf 2669 } else if (match_option(option, "-Xminf", &tail)) { 2670 int minf = (int)(atof(tail) * 100); 2671 if (minf < 0 || minf > 100) { 2672 jio_fprintf(defaultStream::error_stream(), 2673 "Bad min heap free percentage size: %s\n", 2674 option->optionString); 2675 return JNI_EINVAL; 2676 } else { 2677 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2678 } 2679 // -Xss 2680 } else if (match_option(option, "-Xss", &tail)) { 2681 julong long_ThreadStackSize = 0; 2682 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2683 if (errcode != arg_in_range) { 2684 jio_fprintf(defaultStream::error_stream(), 2685 "Invalid thread stack size: %s\n", option->optionString); 2686 describe_range_error(errcode); 2687 return JNI_EINVAL; 2688 } 2689 // Internally track ThreadStackSize in units of 1024 bytes. 2690 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2691 round_to((int)long_ThreadStackSize, K) / K); 2692 // -Xoss 2693 } else if (match_option(option, "-Xoss", &tail)) { 2694 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2695 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2696 julong long_CodeCacheExpansionSize = 0; 2697 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2698 if (errcode != arg_in_range) { 2699 jio_fprintf(defaultStream::error_stream(), 2700 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2701 os::vm_page_size()/K); 2702 return JNI_EINVAL; 2703 } 2704 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2705 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2706 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2707 julong long_ReservedCodeCacheSize = 0; 2708 2709 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2710 if (errcode != arg_in_range) { 2711 jio_fprintf(defaultStream::error_stream(), 2712 "Invalid maximum code cache size: %s.\n", option->optionString); 2713 return JNI_EINVAL; 2714 } 2715 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2716 //-XX:IncreaseFirstTierCompileThresholdAt= 2717 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2718 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2719 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2720 jio_fprintf(defaultStream::error_stream(), 2721 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2722 option->optionString); 2723 return JNI_EINVAL; 2724 } 2725 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2726 // -green 2727 } else if (match_option(option, "-green", &tail)) { 2728 jio_fprintf(defaultStream::error_stream(), 2729 "Green threads support not available\n"); 2730 return JNI_EINVAL; 2731 // -native 2732 } else if (match_option(option, "-native", &tail)) { 2733 // HotSpot always uses native threads, ignore silently for compatibility 2734 // -Xsqnopause 2735 } else if (match_option(option, "-Xsqnopause", &tail)) { 2736 // EVM option, ignore silently for compatibility 2737 // -Xrs 2738 } else if (match_option(option, "-Xrs", &tail)) { 2739 // Classic/EVM option, new functionality 2740 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2741 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2742 // change default internal VM signals used - lower case for back compat 2743 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2744 // -Xoptimize 2745 } else if (match_option(option, "-Xoptimize", &tail)) { 2746 // EVM option, ignore silently for compatibility 2747 // -Xprof 2748 } else if (match_option(option, "-Xprof", &tail)) { 2749 #if INCLUDE_FPROF 2750 _has_profile = true; 2751 #else // INCLUDE_FPROF 2752 jio_fprintf(defaultStream::error_stream(), 2753 "Flat profiling is not supported in this VM.\n"); 2754 return JNI_ERR; 2755 #endif // INCLUDE_FPROF 2756 // -Xconcurrentio 2757 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2758 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2759 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2760 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2761 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2762 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2763 2764 // -Xinternalversion 2765 } else if (match_option(option, "-Xinternalversion", &tail)) { 2766 jio_fprintf(defaultStream::output_stream(), "%s\n", 2767 VM_Version::internal_vm_info_string()); 2768 vm_exit(0); 2769 #ifndef PRODUCT 2770 // -Xprintflags 2771 } else if (match_option(option, "-Xprintflags", &tail)) { 2772 CommandLineFlags::printFlags(tty, false); 2773 vm_exit(0); 2774 #endif 2775 // -D 2776 } else if (match_option(option, "-D", &tail)) { 2777 if (!add_property(tail)) { 2778 return JNI_ENOMEM; 2779 } 2780 // Out of the box management support 2781 if (match_option(option, "-Dcom.sun.management", &tail)) { 2782 #if INCLUDE_MANAGEMENT 2783 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2784 #else 2785 jio_fprintf(defaultStream::output_stream(), 2786 "-Dcom.sun.management is not supported in this VM.\n"); 2787 return JNI_ERR; 2788 #endif 2789 } 2790 // -Xint 2791 } else if (match_option(option, "-Xint", &tail)) { 2792 set_mode_flags(_int); 2793 // -Xmixed 2794 } else if (match_option(option, "-Xmixed", &tail)) { 2795 set_mode_flags(_mixed); 2796 // -Xcomp 2797 } else if (match_option(option, "-Xcomp", &tail)) { 2798 // for testing the compiler; turn off all flags that inhibit compilation 2799 set_mode_flags(_comp); 2800 // -Xshare:dump 2801 } else if (match_option(option, "-Xshare:dump", &tail)) { 2802 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2803 set_mode_flags(_int); // Prevent compilation, which creates objects 2804 // -Xshare:on 2805 } else if (match_option(option, "-Xshare:on", &tail)) { 2806 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2807 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2808 // -Xshare:auto 2809 } else if (match_option(option, "-Xshare:auto", &tail)) { 2810 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2811 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2812 // -Xshare:off 2813 } else if (match_option(option, "-Xshare:off", &tail)) { 2814 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2815 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2816 // -Xverify 2817 } else if (match_option(option, "-Xverify", &tail)) { 2818 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2819 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2820 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2821 } else if (strcmp(tail, ":remote") == 0) { 2822 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2823 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2824 } else if (strcmp(tail, ":none") == 0) { 2825 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2826 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2827 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2828 return JNI_EINVAL; 2829 } 2830 // -Xdebug 2831 } else if (match_option(option, "-Xdebug", &tail)) { 2832 // note this flag has been used, then ignore 2833 set_xdebug_mode(true); 2834 // -Xnoagent 2835 } else if (match_option(option, "-Xnoagent", &tail)) { 2836 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2837 } else if (match_option(option, "-Xboundthreads", &tail)) { 2838 // Bind user level threads to kernel threads (Solaris only) 2839 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2840 } else if (match_option(option, "-Xloggc:", &tail)) { 2841 // Redirect GC output to the file. -Xloggc:<filename> 2842 // ostream_init_log(), when called will use this filename 2843 // to initialize a fileStream. 2844 _gc_log_filename = strdup(tail); 2845 FLAG_SET_CMDLINE(bool, PrintGC, true); 2846 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2847 2848 // JNI hooks 2849 } else if (match_option(option, "-Xcheck", &tail)) { 2850 if (!strcmp(tail, ":jni")) { 2851 #if !INCLUDE_JNI_CHECK 2852 warning("JNI CHECKING is not supported in this VM"); 2853 #else 2854 CheckJNICalls = true; 2855 #endif // INCLUDE_JNI_CHECK 2856 } else if (is_bad_option(option, args->ignoreUnrecognized, 2857 "check")) { 2858 return JNI_EINVAL; 2859 } 2860 } else if (match_option(option, "vfprintf", &tail)) { 2861 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2862 } else if (match_option(option, "exit", &tail)) { 2863 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2864 } else if (match_option(option, "abort", &tail)) { 2865 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2866 // -XX:+AggressiveHeap 2867 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2868 2869 // This option inspects the machine and attempts to set various 2870 // parameters to be optimal for long-running, memory allocation 2871 // intensive jobs. It is intended for machines with large 2872 // amounts of cpu and memory. 2873 2874 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2875 // VM, but we may not be able to represent the total physical memory 2876 // available (like having 8gb of memory on a box but using a 32bit VM). 2877 // Thus, we need to make sure we're using a julong for intermediate 2878 // calculations. 2879 julong initHeapSize; 2880 julong total_memory = os::physical_memory(); 2881 2882 if (total_memory < (julong)256*M) { 2883 jio_fprintf(defaultStream::error_stream(), 2884 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2885 vm_exit(1); 2886 } 2887 2888 // The heap size is half of available memory, or (at most) 2889 // all of possible memory less 160mb (leaving room for the OS 2890 // when using ISM). This is the maximum; because adaptive sizing 2891 // is turned on below, the actual space used may be smaller. 2892 2893 initHeapSize = MIN2(total_memory / (julong)2, 2894 total_memory - (julong)160*M); 2895 2896 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2897 2898 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2899 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2900 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2901 // Currently the minimum size and the initial heap sizes are the same. 2902 set_min_heap_size(initHeapSize); 2903 } 2904 if (FLAG_IS_DEFAULT(NewSize)) { 2905 // Make the young generation 3/8ths of the total heap. 2906 FLAG_SET_CMDLINE(uintx, NewSize, 2907 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2908 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2909 } 2910 2911 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2912 FLAG_SET_DEFAULT(UseLargePages, true); 2913 #endif 2914 2915 // Increase some data structure sizes for efficiency 2916 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2917 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2918 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2919 2920 // See the OldPLABSize comment below, but replace 'after promotion' 2921 // with 'after copying'. YoungPLABSize is the size of the survivor 2922 // space per-gc-thread buffers. The default is 4kw. 2923 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2924 2925 // OldPLABSize is the size of the buffers in the old gen that 2926 // UseParallelGC uses to promote live data that doesn't fit in the 2927 // survivor spaces. At any given time, there's one for each gc thread. 2928 // The default size is 1kw. These buffers are rarely used, since the 2929 // survivor spaces are usually big enough. For specjbb, however, there 2930 // are occasions when there's lots of live data in the young gen 2931 // and we end up promoting some of it. We don't have a definite 2932 // explanation for why bumping OldPLABSize helps, but the theory 2933 // is that a bigger PLAB results in retaining something like the 2934 // original allocation order after promotion, which improves mutator 2935 // locality. A minor effect may be that larger PLABs reduce the 2936 // number of PLAB allocation events during gc. The value of 8kw 2937 // was arrived at by experimenting with specjbb. 2938 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2939 2940 // Enable parallel GC and adaptive generation sizing 2941 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2942 FLAG_SET_DEFAULT(ParallelGCThreads, 2943 Abstract_VM_Version::parallel_worker_threads()); 2944 2945 // Encourage steady state memory management 2946 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2947 2948 // This appears to improve mutator locality 2949 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2950 2951 // Get around early Solaris scheduling bug 2952 // (affinity vs other jobs on system) 2953 // but disallow DR and offlining (5008695). 2954 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2955 2956 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2957 // The last option must always win. 2958 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2959 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2960 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2961 // The last option must always win. 2962 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2963 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2964 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2965 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2966 jio_fprintf(defaultStream::error_stream(), 2967 "Please use CMSClassUnloadingEnabled in place of " 2968 "CMSPermGenSweepingEnabled in the future\n"); 2969 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2970 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2971 jio_fprintf(defaultStream::error_stream(), 2972 "Please use -XX:+UseGCOverheadLimit in place of " 2973 "-XX:+UseGCTimeLimit in the future\n"); 2974 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2975 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2976 jio_fprintf(defaultStream::error_stream(), 2977 "Please use -XX:-UseGCOverheadLimit in place of " 2978 "-XX:-UseGCTimeLimit in the future\n"); 2979 // The TLE options are for compatibility with 1.3 and will be 2980 // removed without notice in a future release. These options 2981 // are not to be documented. 2982 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2983 // No longer used. 2984 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2985 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2986 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2987 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2988 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2989 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2990 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2991 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2992 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2993 // No longer used. 2994 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2995 julong long_tlab_size = 0; 2996 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2997 if (errcode != arg_in_range) { 2998 jio_fprintf(defaultStream::error_stream(), 2999 "Invalid TLAB size: %s\n", option->optionString); 3000 describe_range_error(errcode); 3001 return JNI_EINVAL; 3002 } 3003 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3004 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3005 // No longer used. 3006 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3007 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3008 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3009 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3010 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3011 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3012 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3013 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3014 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3015 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3016 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3017 #if defined(DTRACE_ENABLED) 3018 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3019 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3020 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3021 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3022 #else // defined(DTRACE_ENABLED) 3023 jio_fprintf(defaultStream::error_stream(), 3024 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3025 return JNI_EINVAL; 3026 #endif // defined(DTRACE_ENABLED) 3027 #ifdef ASSERT 3028 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3029 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3030 // disable scavenge before parallel mark-compact 3031 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3032 #endif 3033 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3034 julong cms_blocks_to_claim = (julong)atol(tail); 3035 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3036 jio_fprintf(defaultStream::error_stream(), 3037 "Please use -XX:OldPLABSize in place of " 3038 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3039 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3040 julong cms_blocks_to_claim = (julong)atol(tail); 3041 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3042 jio_fprintf(defaultStream::error_stream(), 3043 "Please use -XX:OldPLABSize in place of " 3044 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3045 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3046 julong old_plab_size = 0; 3047 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3048 if (errcode != arg_in_range) { 3049 jio_fprintf(defaultStream::error_stream(), 3050 "Invalid old PLAB size: %s\n", option->optionString); 3051 describe_range_error(errcode); 3052 return JNI_EINVAL; 3053 } 3054 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3055 jio_fprintf(defaultStream::error_stream(), 3056 "Please use -XX:OldPLABSize in place of " 3057 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3058 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3059 julong young_plab_size = 0; 3060 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3061 if (errcode != arg_in_range) { 3062 jio_fprintf(defaultStream::error_stream(), 3063 "Invalid young PLAB size: %s\n", option->optionString); 3064 describe_range_error(errcode); 3065 return JNI_EINVAL; 3066 } 3067 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3068 jio_fprintf(defaultStream::error_stream(), 3069 "Please use -XX:YoungPLABSize in place of " 3070 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3071 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3072 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3073 julong stack_size = 0; 3074 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3075 if (errcode != arg_in_range) { 3076 jio_fprintf(defaultStream::error_stream(), 3077 "Invalid mark stack size: %s\n", option->optionString); 3078 describe_range_error(errcode); 3079 return JNI_EINVAL; 3080 } 3081 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3082 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3083 julong max_stack_size = 0; 3084 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3085 if (errcode != arg_in_range) { 3086 jio_fprintf(defaultStream::error_stream(), 3087 "Invalid maximum mark stack size: %s\n", 3088 option->optionString); 3089 describe_range_error(errcode); 3090 return JNI_EINVAL; 3091 } 3092 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3093 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3094 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3095 uintx conc_threads = 0; 3096 if (!parse_uintx(tail, &conc_threads, 1)) { 3097 jio_fprintf(defaultStream::error_stream(), 3098 "Invalid concurrent threads: %s\n", option->optionString); 3099 return JNI_EINVAL; 3100 } 3101 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3102 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3103 julong max_direct_memory_size = 0; 3104 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3105 if (errcode != arg_in_range) { 3106 jio_fprintf(defaultStream::error_stream(), 3107 "Invalid maximum direct memory size: %s\n", 3108 option->optionString); 3109 describe_range_error(errcode); 3110 return JNI_EINVAL; 3111 } 3112 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3113 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3114 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3115 // away and will cause VM initialization failures! 3116 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3117 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3118 #if !INCLUDE_MANAGEMENT 3119 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3120 jio_fprintf(defaultStream::error_stream(), 3121 "ManagementServer is not supported in this VM.\n"); 3122 return JNI_ERR; 3123 #endif // INCLUDE_MANAGEMENT 3124 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3125 // Skip -XX:Flags= since that case has already been handled 3126 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3127 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3128 return JNI_EINVAL; 3129 } 3130 } 3131 // Unknown option 3132 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3133 return JNI_ERR; 3134 } 3135 } 3136 3137 // Change the default value for flags which have different default values 3138 // when working with older JDKs. 3139 #ifdef LINUX 3140 if (JDK_Version::current().compare_major(6) <= 0 && 3141 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3142 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3143 } 3144 #endif // LINUX 3145 return JNI_OK; 3146 } 3147 3148 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3149 // This must be done after all -D arguments have been processed. 3150 scp_p->expand_endorsed(); 3151 3152 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3153 // Assemble the bootclasspath elements into the final path. 3154 Arguments::set_sysclasspath(scp_p->combined_path()); 3155 } 3156 3157 // This must be done after all arguments have been processed. 3158 // java_compiler() true means set to "NONE" or empty. 3159 if (java_compiler() && !xdebug_mode()) { 3160 // For backwards compatibility, we switch to interpreted mode if 3161 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3162 // not specified. 3163 set_mode_flags(_int); 3164 } 3165 if (CompileThreshold == 0) { 3166 set_mode_flags(_int); 3167 } 3168 3169 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3170 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3171 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3172 } 3173 3174 #ifndef COMPILER2 3175 // Don't degrade server performance for footprint 3176 if (FLAG_IS_DEFAULT(UseLargePages) && 3177 MaxHeapSize < LargePageHeapSizeThreshold) { 3178 // No need for large granularity pages w/small heaps. 3179 // Note that large pages are enabled/disabled for both the 3180 // Java heap and the code cache. 3181 FLAG_SET_DEFAULT(UseLargePages, false); 3182 } 3183 3184 #else 3185 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3186 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3187 } 3188 #endif 3189 3190 #ifndef TIERED 3191 // Tiered compilation is undefined. 3192 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3193 #endif 3194 3195 // If we are running in a headless jre, force java.awt.headless property 3196 // to be true unless the property has already been set. 3197 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3198 if (os::is_headless_jre()) { 3199 const char* headless = Arguments::get_property("java.awt.headless"); 3200 if (headless == NULL) { 3201 char envbuffer[128]; 3202 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3203 if (!add_property("java.awt.headless=true")) { 3204 return JNI_ENOMEM; 3205 } 3206 } else { 3207 char buffer[256]; 3208 strcpy(buffer, "java.awt.headless="); 3209 strcat(buffer, envbuffer); 3210 if (!add_property(buffer)) { 3211 return JNI_ENOMEM; 3212 } 3213 } 3214 } 3215 } 3216 3217 if (!check_vm_args_consistency()) { 3218 return JNI_ERR; 3219 } 3220 3221 return JNI_OK; 3222 } 3223 3224 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3225 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3226 scp_assembly_required_p); 3227 } 3228 3229 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3230 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3231 scp_assembly_required_p); 3232 } 3233 3234 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3235 const int N_MAX_OPTIONS = 64; 3236 const int OPTION_BUFFER_SIZE = 1024; 3237 char buffer[OPTION_BUFFER_SIZE]; 3238 3239 // The variable will be ignored if it exceeds the length of the buffer. 3240 // Don't check this variable if user has special privileges 3241 // (e.g. unix su command). 3242 if (os::getenv(name, buffer, sizeof(buffer)) && 3243 !os::have_special_privileges()) { 3244 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3245 jio_fprintf(defaultStream::error_stream(), 3246 "Picked up %s: %s\n", name, buffer); 3247 char* rd = buffer; // pointer to the input string (rd) 3248 int i; 3249 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3250 while (isspace(*rd)) rd++; // skip whitespace 3251 if (*rd == 0) break; // we re done when the input string is read completely 3252 3253 // The output, option string, overwrites the input string. 3254 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3255 // input string (rd). 3256 char* wrt = rd; 3257 3258 options[i++].optionString = wrt; // Fill in option 3259 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3260 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3261 int quote = *rd; // matching quote to look for 3262 rd++; // don't copy open quote 3263 while (*rd != quote) { // include everything (even spaces) up until quote 3264 if (*rd == 0) { // string termination means unmatched string 3265 jio_fprintf(defaultStream::error_stream(), 3266 "Unmatched quote in %s\n", name); 3267 return JNI_ERR; 3268 } 3269 *wrt++ = *rd++; // copy to option string 3270 } 3271 rd++; // don't copy close quote 3272 } else { 3273 *wrt++ = *rd++; // copy to option string 3274 } 3275 } 3276 // Need to check if we're done before writing a NULL, 3277 // because the write could be to the byte that rd is pointing to. 3278 if (*rd++ == 0) { 3279 *wrt = 0; 3280 break; 3281 } 3282 *wrt = 0; // Zero terminate option 3283 } 3284 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3285 JavaVMInitArgs vm_args; 3286 vm_args.version = JNI_VERSION_1_2; 3287 vm_args.options = options; 3288 vm_args.nOptions = i; 3289 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3290 3291 if (PrintVMOptions) { 3292 const char* tail; 3293 for (int i = 0; i < vm_args.nOptions; i++) { 3294 const JavaVMOption *option = vm_args.options + i; 3295 if (match_option(option, "-XX:", &tail)) { 3296 logOption(tail); 3297 } 3298 } 3299 } 3300 3301 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 3302 } 3303 return JNI_OK; 3304 } 3305 3306 void Arguments::set_shared_spaces_flags() { 3307 if (DumpSharedSpaces) { 3308 if (RequireSharedSpaces) { 3309 warning("cannot dump shared archive while using shared archive"); 3310 } 3311 UseSharedSpaces = false; 3312 #ifdef _LP64 3313 if (!UseCompressedOops || !UseCompressedKlassPointers) { 3314 vm_exit_during_initialization( 3315 "Cannot dump shared archive when UseCompressedOops or UseCompressedKlassPointers is off.", NULL); 3316 } 3317 } else { 3318 // UseCompressedOops and UseCompressedKlassPointers must be on for UseSharedSpaces. 3319 if (!UseCompressedOops || !UseCompressedKlassPointers) { 3320 no_shared_spaces(); 3321 } 3322 #endif 3323 } 3324 } 3325 3326 #if !INCLUDE_ALL_GCS 3327 static void force_serial_gc() { 3328 FLAG_SET_DEFAULT(UseSerialGC, true); 3329 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3330 UNSUPPORTED_GC_OPTION(UseG1GC); 3331 UNSUPPORTED_GC_OPTION(UseParallelGC); 3332 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3333 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3334 UNSUPPORTED_GC_OPTION(UseParNewGC); 3335 } 3336 #endif // INCLUDE_ALL_GCS 3337 3338 // Sharing support 3339 // Construct the path to the archive 3340 static char* get_shared_archive_path() { 3341 char *shared_archive_path; 3342 if (SharedArchiveFile == NULL) { 3343 char jvm_path[JVM_MAXPATHLEN]; 3344 os::jvm_path(jvm_path, sizeof(jvm_path)); 3345 char *end = strrchr(jvm_path, *os::file_separator()); 3346 if (end != NULL) *end = '\0'; 3347 size_t jvm_path_len = strlen(jvm_path); 3348 size_t file_sep_len = strlen(os::file_separator()); 3349 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3350 file_sep_len + 20, mtInternal); 3351 if (shared_archive_path != NULL) { 3352 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3353 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3354 strncat(shared_archive_path, "classes.jsa", 11); 3355 } 3356 } else { 3357 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3358 if (shared_archive_path != NULL) { 3359 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3360 } 3361 } 3362 return shared_archive_path; 3363 } 3364 3365 // Parse entry point called from JNI_CreateJavaVM 3366 3367 jint Arguments::parse(const JavaVMInitArgs* args) { 3368 3369 // Remaining part of option string 3370 const char* tail; 3371 3372 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3373 const char* hotspotrc = ".hotspotrc"; 3374 bool settings_file_specified = false; 3375 bool needs_hotspotrc_warning = false; 3376 3377 const char* flags_file; 3378 int index; 3379 for (index = 0; index < args->nOptions; index++) { 3380 const JavaVMOption *option = args->options + index; 3381 if (match_option(option, "-XX:Flags=", &tail)) { 3382 flags_file = tail; 3383 settings_file_specified = true; 3384 } 3385 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3386 PrintVMOptions = true; 3387 } 3388 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3389 PrintVMOptions = false; 3390 } 3391 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3392 IgnoreUnrecognizedVMOptions = true; 3393 } 3394 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3395 IgnoreUnrecognizedVMOptions = false; 3396 } 3397 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3398 CommandLineFlags::printFlags(tty, false); 3399 vm_exit(0); 3400 } 3401 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3402 #if INCLUDE_NMT 3403 MemTracker::init_tracking_options(tail); 3404 #else 3405 jio_fprintf(defaultStream::error_stream(), 3406 "Native Memory Tracking is not supported in this VM\n"); 3407 return JNI_ERR; 3408 #endif 3409 } 3410 3411 3412 #ifndef PRODUCT 3413 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3414 CommandLineFlags::printFlags(tty, true); 3415 vm_exit(0); 3416 } 3417 #endif 3418 } 3419 3420 if (IgnoreUnrecognizedVMOptions) { 3421 // uncast const to modify the flag args->ignoreUnrecognized 3422 *(jboolean*)(&args->ignoreUnrecognized) = true; 3423 } 3424 3425 // Parse specified settings file 3426 if (settings_file_specified) { 3427 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3428 return JNI_EINVAL; 3429 } 3430 } else { 3431 #ifdef ASSERT 3432 // Parse default .hotspotrc settings file 3433 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3434 return JNI_EINVAL; 3435 } 3436 #else 3437 struct stat buf; 3438 if (os::stat(hotspotrc, &buf) == 0) { 3439 needs_hotspotrc_warning = true; 3440 } 3441 #endif 3442 } 3443 3444 if (PrintVMOptions) { 3445 for (index = 0; index < args->nOptions; index++) { 3446 const JavaVMOption *option = args->options + index; 3447 if (match_option(option, "-XX:", &tail)) { 3448 logOption(tail); 3449 } 3450 } 3451 } 3452 3453 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3454 jint result = parse_vm_init_args(args); 3455 if (result != JNI_OK) { 3456 return result; 3457 } 3458 3459 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3460 SharedArchivePath = get_shared_archive_path(); 3461 if (SharedArchivePath == NULL) { 3462 return JNI_ENOMEM; 3463 } 3464 3465 // Delay warning until here so that we've had a chance to process 3466 // the -XX:-PrintWarnings flag 3467 if (needs_hotspotrc_warning) { 3468 warning("%s file is present but has been ignored. " 3469 "Run with -XX:Flags=%s to load the file.", 3470 hotspotrc, hotspotrc); 3471 } 3472 3473 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3474 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3475 #endif 3476 3477 #if INCLUDE_ALL_GCS 3478 #if (defined JAVASE_EMBEDDED || defined ARM) 3479 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3480 #endif 3481 #endif 3482 3483 #ifndef PRODUCT 3484 if (TraceBytecodesAt != 0) { 3485 TraceBytecodes = true; 3486 } 3487 if (CountCompiledCalls) { 3488 if (UseCounterDecay) { 3489 warning("UseCounterDecay disabled because CountCalls is set"); 3490 UseCounterDecay = false; 3491 } 3492 } 3493 #endif // PRODUCT 3494 3495 // JSR 292 is not supported before 1.7 3496 if (!JDK_Version::is_gte_jdk17x_version()) { 3497 if (EnableInvokeDynamic) { 3498 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3499 warning("JSR 292 is not supported before 1.7. Disabling support."); 3500 } 3501 EnableInvokeDynamic = false; 3502 } 3503 } 3504 3505 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3506 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3507 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3508 } 3509 ScavengeRootsInCode = 1; 3510 } 3511 3512 if (PrintGCDetails) { 3513 // Turn on -verbose:gc options as well 3514 PrintGC = true; 3515 } 3516 3517 if (!JDK_Version::is_gte_jdk18x_version()) { 3518 // To avoid changing the log format for 7 updates this flag is only 3519 // true by default in JDK8 and above. 3520 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3521 FLAG_SET_DEFAULT(PrintGCCause, false); 3522 } 3523 } 3524 3525 // Set object alignment values. 3526 set_object_alignment(); 3527 3528 #if !INCLUDE_ALL_GCS 3529 force_serial_gc(); 3530 #endif // INCLUDE_ALL_GCS 3531 #if !INCLUDE_CDS 3532 if (DumpSharedSpaces || RequireSharedSpaces) { 3533 jio_fprintf(defaultStream::error_stream(), 3534 "Shared spaces are not supported in this VM\n"); 3535 return JNI_ERR; 3536 } 3537 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3538 warning("Shared spaces are not supported in this VM"); 3539 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3540 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3541 } 3542 no_shared_spaces(); 3543 #endif // INCLUDE_CDS 3544 3545 // We need to initialize large page support here because ergonomics takes some 3546 // decisions depending on large page support and the calculated large page size. 3547 // Ergonomics may turn off large page support off later again. 3548 os::large_page_init(); 3549 3550 // Set flags based on ergonomics. 3551 set_ergonomics_flags(); 3552 3553 set_shared_spaces_flags(); 3554 3555 // Check the GC selections again. 3556 if (!check_gc_consistency()) { 3557 return JNI_EINVAL; 3558 } 3559 3560 if (TieredCompilation) { 3561 set_tiered_flags(); 3562 } else { 3563 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3564 if (CompilationPolicyChoice >= 2) { 3565 vm_exit_during_initialization( 3566 "Incompatible compilation policy selected", NULL); 3567 } 3568 } 3569 3570 set_heap_base_min_address(); 3571 3572 // Set heap size based on available physical memory 3573 set_heap_size(); 3574 3575 #if INCLUDE_ALL_GCS 3576 // Set per-collector flags 3577 if (UseParallelGC || UseParallelOldGC) { 3578 set_parallel_gc_flags(); 3579 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3580 set_cms_and_parnew_gc_flags(); 3581 } else if (UseParNewGC) { // skipped if CMS is set above 3582 set_parnew_gc_flags(); 3583 } else if (UseG1GC) { 3584 set_g1_gc_flags(); 3585 } 3586 check_deprecated_gcs(); 3587 check_deprecated_gc_flags(); 3588 if (AssumeMP && !UseSerialGC) { 3589 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3590 warning("If the number of processors is expected to increase from one, then" 3591 " you should configure the number of parallel GC threads appropriately" 3592 " using -XX:ParallelGCThreads=N"); 3593 } 3594 } 3595 #else // INCLUDE_ALL_GCS 3596 assert(verify_serial_gc_flags(), "SerialGC unset"); 3597 #endif // INCLUDE_ALL_GCS 3598 3599 // Set bytecode rewriting flags 3600 set_bytecode_flags(); 3601 3602 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3603 set_aggressive_opts_flags(); 3604 3605 // Turn off biased locking for locking debug mode flags, 3606 // which are subtlely different from each other but neither works with 3607 // biased locking. 3608 if (UseHeavyMonitors 3609 #ifdef COMPILER1 3610 || !UseFastLocking 3611 #endif // COMPILER1 3612 ) { 3613 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3614 // flag set to true on command line; warn the user that they 3615 // can't enable biased locking here 3616 warning("Biased Locking is not supported with locking debug flags" 3617 "; ignoring UseBiasedLocking flag." ); 3618 } 3619 UseBiasedLocking = false; 3620 } 3621 3622 #ifdef CC_INTERP 3623 // Clear flags not supported by the C++ interpreter 3624 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3625 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3626 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3627 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedKlassPointers, false)); 3628 #endif // CC_INTERP 3629 3630 #ifdef COMPILER2 3631 if (!UseBiasedLocking || EmitSync != 0) { 3632 UseOptoBiasInlining = false; 3633 } 3634 if (!EliminateLocks) { 3635 EliminateNestedLocks = false; 3636 } 3637 if (!Inline) { 3638 IncrementalInline = false; 3639 } 3640 #ifndef PRODUCT 3641 if (!IncrementalInline) { 3642 AlwaysIncrementalInline = false; 3643 } 3644 #endif 3645 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3646 // incremental inlining: bump MaxNodeLimit 3647 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3648 } 3649 #endif 3650 3651 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3652 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3653 DebugNonSafepoints = true; 3654 } 3655 3656 #ifndef PRODUCT 3657 if (CompileTheWorld) { 3658 // Force NmethodSweeper to sweep whole CodeCache each time. 3659 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3660 NmethodSweepFraction = 1; 3661 } 3662 } 3663 #endif 3664 3665 if (PrintCommandLineFlags) { 3666 CommandLineFlags::printSetFlags(tty); 3667 } 3668 3669 // Apply CPU specific policy for the BiasedLocking 3670 if (UseBiasedLocking) { 3671 if (!VM_Version::use_biased_locking() && 3672 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3673 UseBiasedLocking = false; 3674 } 3675 } 3676 3677 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3678 // but only if not already set on the commandline 3679 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3680 bool set = false; 3681 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3682 if (!set) { 3683 FLAG_SET_DEFAULT(PauseAtExit, true); 3684 } 3685 } 3686 3687 return JNI_OK; 3688 } 3689 3690 jint Arguments::adjust_after_os() { 3691 #if INCLUDE_ALL_GCS 3692 if (UseParallelGC || UseParallelOldGC) { 3693 if (UseNUMA) { 3694 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3695 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3696 } 3697 // For those collectors or operating systems (eg, Windows) that do 3698 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3699 UseNUMAInterleaving = true; 3700 } 3701 } 3702 #endif // INCLUDE_ALL_GCS 3703 return JNI_OK; 3704 } 3705 3706 int Arguments::PropertyList_count(SystemProperty* pl) { 3707 int count = 0; 3708 while(pl != NULL) { 3709 count++; 3710 pl = pl->next(); 3711 } 3712 return count; 3713 } 3714 3715 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3716 assert(key != NULL, "just checking"); 3717 SystemProperty* prop; 3718 for (prop = pl; prop != NULL; prop = prop->next()) { 3719 if (strcmp(key, prop->key()) == 0) return prop->value(); 3720 } 3721 return NULL; 3722 } 3723 3724 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3725 int count = 0; 3726 const char* ret_val = NULL; 3727 3728 while(pl != NULL) { 3729 if(count >= index) { 3730 ret_val = pl->key(); 3731 break; 3732 } 3733 count++; 3734 pl = pl->next(); 3735 } 3736 3737 return ret_val; 3738 } 3739 3740 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3741 int count = 0; 3742 char* ret_val = NULL; 3743 3744 while(pl != NULL) { 3745 if(count >= index) { 3746 ret_val = pl->value(); 3747 break; 3748 } 3749 count++; 3750 pl = pl->next(); 3751 } 3752 3753 return ret_val; 3754 } 3755 3756 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3757 SystemProperty* p = *plist; 3758 if (p == NULL) { 3759 *plist = new_p; 3760 } else { 3761 while (p->next() != NULL) { 3762 p = p->next(); 3763 } 3764 p->set_next(new_p); 3765 } 3766 } 3767 3768 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3769 if (plist == NULL) 3770 return; 3771 3772 SystemProperty* new_p = new SystemProperty(k, v, true); 3773 PropertyList_add(plist, new_p); 3774 } 3775 3776 // This add maintains unique property key in the list. 3777 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3778 if (plist == NULL) 3779 return; 3780 3781 // If property key exist then update with new value. 3782 SystemProperty* prop; 3783 for (prop = *plist; prop != NULL; prop = prop->next()) { 3784 if (strcmp(k, prop->key()) == 0) { 3785 if (append) { 3786 prop->append_value(v); 3787 } else { 3788 prop->set_value(v); 3789 } 3790 return; 3791 } 3792 } 3793 3794 PropertyList_add(plist, k, v); 3795 } 3796 3797 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3798 // Returns true if all of the source pointed by src has been copied over to 3799 // the destination buffer pointed by buf. Otherwise, returns false. 3800 // Notes: 3801 // 1. If the length (buflen) of the destination buffer excluding the 3802 // NULL terminator character is not long enough for holding the expanded 3803 // pid characters, it also returns false instead of returning the partially 3804 // expanded one. 3805 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3806 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3807 char* buf, size_t buflen) { 3808 const char* p = src; 3809 char* b = buf; 3810 const char* src_end = &src[srclen]; 3811 char* buf_end = &buf[buflen - 1]; 3812 3813 while (p < src_end && b < buf_end) { 3814 if (*p == '%') { 3815 switch (*(++p)) { 3816 case '%': // "%%" ==> "%" 3817 *b++ = *p++; 3818 break; 3819 case 'p': { // "%p" ==> current process id 3820 // buf_end points to the character before the last character so 3821 // that we could write '\0' to the end of the buffer. 3822 size_t buf_sz = buf_end - b + 1; 3823 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3824 3825 // if jio_snprintf fails or the buffer is not long enough to hold 3826 // the expanded pid, returns false. 3827 if (ret < 0 || ret >= (int)buf_sz) { 3828 return false; 3829 } else { 3830 b += ret; 3831 assert(*b == '\0', "fail in copy_expand_pid"); 3832 if (p == src_end && b == buf_end + 1) { 3833 // reach the end of the buffer. 3834 return true; 3835 } 3836 } 3837 p++; 3838 break; 3839 } 3840 default : 3841 *b++ = '%'; 3842 } 3843 } else { 3844 *b++ = *p++; 3845 } 3846 } 3847 *b = '\0'; 3848 return (p == src_end); // return false if not all of the source was copied 3849 }