1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "classfile/symbolTable.hpp" 28 #include "compiler/compilerOracle.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/cardTableRS.hpp" 31 #include "memory/genCollectedHeap.hpp" 32 #include "memory/referenceProcessor.hpp" 33 #include "memory/universe.inline.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "prims/jvmtiExport.hpp" 36 #include "runtime/arguments.hpp" 37 #include "runtime/globals_extension.hpp" 38 #include "runtime/java.hpp" 39 #include "services/management.hpp" 40 #include "services/memTracker.hpp" 41 #include "utilities/defaultStream.hpp" 42 #include "utilities/macros.hpp" 43 #include "utilities/taskqueue.hpp" 44 #ifdef TARGET_OS_FAMILY_linux 45 # include "os_linux.inline.hpp" 46 #endif 47 #ifdef TARGET_OS_FAMILY_solaris 48 # include "os_solaris.inline.hpp" 49 #endif 50 #ifdef TARGET_OS_FAMILY_windows 51 # include "os_windows.inline.hpp" 52 #endif 53 #ifdef TARGET_OS_FAMILY_aix 54 # include "os_aix.inline.hpp" 55 #endif 56 #ifdef TARGET_OS_FAMILY_bsd 57 # include "os_bsd.inline.hpp" 58 #endif 59 #if INCLUDE_ALL_GCS 60 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 61 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 62 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 63 #endif // INCLUDE_ALL_GCS 64 65 // Note: This is a special bug reporting site for the JVM 66 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 67 #define DEFAULT_JAVA_LAUNCHER "generic" 68 69 // Disable options not supported in this release, with a warning if they 70 // were explicitly requested on the command-line 71 #define UNSUPPORTED_OPTION(opt, description) \ 72 do { \ 73 if (opt) { \ 74 if (FLAG_IS_CMDLINE(opt)) { \ 75 warning(description " is disabled in this release."); \ 76 } \ 77 FLAG_SET_DEFAULT(opt, false); \ 78 } \ 79 } while(0) 80 81 #define UNSUPPORTED_GC_OPTION(gc) \ 82 do { \ 83 if (gc) { \ 84 if (FLAG_IS_CMDLINE(gc)) { \ 85 warning(#gc " is not supported in this VM. Using Serial GC."); \ 86 } \ 87 FLAG_SET_DEFAULT(gc, false); \ 88 } \ 89 } while(0) 90 91 char** Arguments::_jvm_flags_array = NULL; 92 int Arguments::_num_jvm_flags = 0; 93 char** Arguments::_jvm_args_array = NULL; 94 int Arguments::_num_jvm_args = 0; 95 char* Arguments::_java_command = NULL; 96 SystemProperty* Arguments::_system_properties = NULL; 97 const char* Arguments::_gc_log_filename = NULL; 98 bool Arguments::_has_profile = false; 99 size_t Arguments::_conservative_max_heap_alignment = 0; 100 uintx Arguments::_min_heap_size = 0; 101 Arguments::Mode Arguments::_mode = _mixed; 102 bool Arguments::_java_compiler = false; 103 bool Arguments::_xdebug_mode = false; 104 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 105 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 106 int Arguments::_sun_java_launcher_pid = -1; 107 bool Arguments::_created_by_gamma_launcher = false; 108 109 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 110 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 111 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 112 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 113 bool Arguments::_ClipInlining = ClipInlining; 114 115 char* Arguments::SharedArchivePath = NULL; 116 117 AgentLibraryList Arguments::_libraryList; 118 AgentLibraryList Arguments::_agentList; 119 120 abort_hook_t Arguments::_abort_hook = NULL; 121 exit_hook_t Arguments::_exit_hook = NULL; 122 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 123 124 125 SystemProperty *Arguments::_java_ext_dirs = NULL; 126 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 127 SystemProperty *Arguments::_sun_boot_library_path = NULL; 128 SystemProperty *Arguments::_java_library_path = NULL; 129 SystemProperty *Arguments::_java_home = NULL; 130 SystemProperty *Arguments::_java_class_path = NULL; 131 SystemProperty *Arguments::_sun_boot_class_path = NULL; 132 133 char* Arguments::_meta_index_path = NULL; 134 char* Arguments::_meta_index_dir = NULL; 135 136 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 137 138 static bool match_option(const JavaVMOption *option, const char* name, 139 const char** tail) { 140 int len = (int)strlen(name); 141 if (strncmp(option->optionString, name, len) == 0) { 142 *tail = option->optionString + len; 143 return true; 144 } else { 145 return false; 146 } 147 } 148 149 static void logOption(const char* opt) { 150 if (PrintVMOptions) { 151 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 152 } 153 } 154 155 // Process java launcher properties. 156 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 157 // See if sun.java.launcher or sun.java.launcher.pid is defined. 158 // Must do this before setting up other system properties, 159 // as some of them may depend on launcher type. 160 for (int index = 0; index < args->nOptions; index++) { 161 const JavaVMOption* option = args->options + index; 162 const char* tail; 163 164 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 165 process_java_launcher_argument(tail, option->extraInfo); 166 continue; 167 } 168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 169 _sun_java_launcher_pid = atoi(tail); 170 continue; 171 } 172 } 173 } 174 175 // Initialize system properties key and value. 176 void Arguments::init_system_properties() { 177 178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 179 "Java Virtual Machine Specification", false)); 180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 183 184 // following are JVMTI agent writeable properties. 185 // Properties values are set to NULL and they are 186 // os specific they are initialized in os::init_system_properties_values(). 187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 190 _java_library_path = new SystemProperty("java.library.path", NULL, true); 191 _java_home = new SystemProperty("java.home", NULL, true); 192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 193 194 _java_class_path = new SystemProperty("java.class.path", "", true); 195 196 // Add to System Property list. 197 PropertyList_add(&_system_properties, _java_ext_dirs); 198 PropertyList_add(&_system_properties, _java_endorsed_dirs); 199 PropertyList_add(&_system_properties, _sun_boot_library_path); 200 PropertyList_add(&_system_properties, _java_library_path); 201 PropertyList_add(&_system_properties, _java_home); 202 PropertyList_add(&_system_properties, _java_class_path); 203 PropertyList_add(&_system_properties, _sun_boot_class_path); 204 205 // Set OS specific system properties values 206 os::init_system_properties_values(); 207 } 208 209 210 // Update/Initialize System properties after JDK version number is known 211 void Arguments::init_version_specific_system_properties() { 212 enum { bufsz = 16 }; 213 char buffer[bufsz]; 214 const char* spec_vendor = "Sun Microsystems Inc."; 215 uint32_t spec_version = 0; 216 217 if (JDK_Version::is_gte_jdk17x_version()) { 218 spec_vendor = "Oracle Corporation"; 219 spec_version = JDK_Version::current().major_version(); 220 } 221 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 222 223 PropertyList_add(&_system_properties, 224 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 225 PropertyList_add(&_system_properties, 226 new SystemProperty("java.vm.specification.version", buffer, false)); 227 PropertyList_add(&_system_properties, 228 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 229 } 230 231 /** 232 * Provide a slightly more user-friendly way of eliminating -XX flags. 233 * When a flag is eliminated, it can be added to this list in order to 234 * continue accepting this flag on the command-line, while issuing a warning 235 * and ignoring the value. Once the JDK version reaches the 'accept_until' 236 * limit, we flatly refuse to admit the existence of the flag. This allows 237 * a flag to die correctly over JDK releases using HSX. 238 */ 239 typedef struct { 240 const char* name; 241 JDK_Version obsoleted_in; // when the flag went away 242 JDK_Version accept_until; // which version to start denying the existence 243 } ObsoleteFlag; 244 245 static ObsoleteFlag obsolete_jvm_flags[] = { 246 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 260 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 261 { "DefaultInitialRAMFraction", 262 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 263 { "UseDepthFirstScavengeOrder", 264 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 265 { "HandlePromotionFailure", 266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 267 { "MaxLiveObjectEvacuationRatio", 268 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 269 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 270 { "UseParallelOldGCCompacting", 271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 272 { "UseParallelDensePrefixUpdate", 273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 274 { "UseParallelOldGCDensePrefix", 275 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 276 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 277 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 278 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 297 #ifdef PRODUCT 298 { "DesiredMethodLimit", 299 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 300 #endif // PRODUCT 301 { NULL, JDK_Version(0), JDK_Version(0) } 302 }; 303 304 // Returns true if the flag is obsolete and fits into the range specified 305 // for being ignored. In the case that the flag is ignored, the 'version' 306 // value is filled in with the version number when the flag became 307 // obsolete so that that value can be displayed to the user. 308 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 309 int i = 0; 310 assert(version != NULL, "Must provide a version buffer"); 311 while (obsolete_jvm_flags[i].name != NULL) { 312 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 313 // <flag>=xxx form 314 // [-|+]<flag> form 315 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 316 ((s[0] == '+' || s[0] == '-') && 317 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 318 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 319 *version = flag_status.obsoleted_in; 320 return true; 321 } 322 } 323 i++; 324 } 325 return false; 326 } 327 328 // Constructs the system class path (aka boot class path) from the following 329 // components, in order: 330 // 331 // prefix // from -Xbootclasspath/p:... 332 // endorsed // the expansion of -Djava.endorsed.dirs=... 333 // base // from os::get_system_properties() or -Xbootclasspath= 334 // suffix // from -Xbootclasspath/a:... 335 // 336 // java.endorsed.dirs is a list of directories; any jar or zip files in the 337 // directories are added to the sysclasspath just before the base. 338 // 339 // This could be AllStatic, but it isn't needed after argument processing is 340 // complete. 341 class SysClassPath: public StackObj { 342 public: 343 SysClassPath(const char* base); 344 ~SysClassPath(); 345 346 inline void set_base(const char* base); 347 inline void add_prefix(const char* prefix); 348 inline void add_suffix_to_prefix(const char* suffix); 349 inline void add_suffix(const char* suffix); 350 inline void reset_path(const char* base); 351 352 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 353 // property. Must be called after all command-line arguments have been 354 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 355 // combined_path(). 356 void expand_endorsed(); 357 358 inline const char* get_base() const { return _items[_scp_base]; } 359 inline const char* get_prefix() const { return _items[_scp_prefix]; } 360 inline const char* get_suffix() const { return _items[_scp_suffix]; } 361 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 362 363 // Combine all the components into a single c-heap-allocated string; caller 364 // must free the string if/when no longer needed. 365 char* combined_path(); 366 367 private: 368 // Utility routines. 369 static char* add_to_path(const char* path, const char* str, bool prepend); 370 static char* add_jars_to_path(char* path, const char* directory); 371 372 inline void reset_item_at(int index); 373 374 // Array indices for the items that make up the sysclasspath. All except the 375 // base are allocated in the C heap and freed by this class. 376 enum { 377 _scp_prefix, // from -Xbootclasspath/p:... 378 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 379 _scp_base, // the default sysclasspath 380 _scp_suffix, // from -Xbootclasspath/a:... 381 _scp_nitems // the number of items, must be last. 382 }; 383 384 const char* _items[_scp_nitems]; 385 DEBUG_ONLY(bool _expansion_done;) 386 }; 387 388 SysClassPath::SysClassPath(const char* base) { 389 memset(_items, 0, sizeof(_items)); 390 _items[_scp_base] = base; 391 DEBUG_ONLY(_expansion_done = false;) 392 } 393 394 SysClassPath::~SysClassPath() { 395 // Free everything except the base. 396 for (int i = 0; i < _scp_nitems; ++i) { 397 if (i != _scp_base) reset_item_at(i); 398 } 399 DEBUG_ONLY(_expansion_done = false;) 400 } 401 402 inline void SysClassPath::set_base(const char* base) { 403 _items[_scp_base] = base; 404 } 405 406 inline void SysClassPath::add_prefix(const char* prefix) { 407 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 408 } 409 410 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 411 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 412 } 413 414 inline void SysClassPath::add_suffix(const char* suffix) { 415 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 416 } 417 418 inline void SysClassPath::reset_item_at(int index) { 419 assert(index < _scp_nitems && index != _scp_base, "just checking"); 420 if (_items[index] != NULL) { 421 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 422 _items[index] = NULL; 423 } 424 } 425 426 inline void SysClassPath::reset_path(const char* base) { 427 // Clear the prefix and suffix. 428 reset_item_at(_scp_prefix); 429 reset_item_at(_scp_suffix); 430 set_base(base); 431 } 432 433 //------------------------------------------------------------------------------ 434 435 void SysClassPath::expand_endorsed() { 436 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 437 438 const char* path = Arguments::get_property("java.endorsed.dirs"); 439 if (path == NULL) { 440 path = Arguments::get_endorsed_dir(); 441 assert(path != NULL, "no default for java.endorsed.dirs"); 442 } 443 444 char* expanded_path = NULL; 445 const char separator = *os::path_separator(); 446 const char* const end = path + strlen(path); 447 while (path < end) { 448 const char* tmp_end = strchr(path, separator); 449 if (tmp_end == NULL) { 450 expanded_path = add_jars_to_path(expanded_path, path); 451 path = end; 452 } else { 453 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 454 memcpy(dirpath, path, tmp_end - path); 455 dirpath[tmp_end - path] = '\0'; 456 expanded_path = add_jars_to_path(expanded_path, dirpath); 457 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 458 path = tmp_end + 1; 459 } 460 } 461 _items[_scp_endorsed] = expanded_path; 462 DEBUG_ONLY(_expansion_done = true;) 463 } 464 465 // Combine the bootclasspath elements, some of which may be null, into a single 466 // c-heap-allocated string. 467 char* SysClassPath::combined_path() { 468 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 469 assert(_expansion_done, "must call expand_endorsed() first."); 470 471 size_t lengths[_scp_nitems]; 472 size_t total_len = 0; 473 474 const char separator = *os::path_separator(); 475 476 // Get the lengths. 477 int i; 478 for (i = 0; i < _scp_nitems; ++i) { 479 if (_items[i] != NULL) { 480 lengths[i] = strlen(_items[i]); 481 // Include space for the separator char (or a NULL for the last item). 482 total_len += lengths[i] + 1; 483 } 484 } 485 assert(total_len > 0, "empty sysclasspath not allowed"); 486 487 // Copy the _items to a single string. 488 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 489 char* cp_tmp = cp; 490 for (i = 0; i < _scp_nitems; ++i) { 491 if (_items[i] != NULL) { 492 memcpy(cp_tmp, _items[i], lengths[i]); 493 cp_tmp += lengths[i]; 494 *cp_tmp++ = separator; 495 } 496 } 497 *--cp_tmp = '\0'; // Replace the extra separator. 498 return cp; 499 } 500 501 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 502 char* 503 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 504 char *cp; 505 506 assert(str != NULL, "just checking"); 507 if (path == NULL) { 508 size_t len = strlen(str) + 1; 509 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 510 memcpy(cp, str, len); // copy the trailing null 511 } else { 512 const char separator = *os::path_separator(); 513 size_t old_len = strlen(path); 514 size_t str_len = strlen(str); 515 size_t len = old_len + str_len + 2; 516 517 if (prepend) { 518 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 519 char* cp_tmp = cp; 520 memcpy(cp_tmp, str, str_len); 521 cp_tmp += str_len; 522 *cp_tmp = separator; 523 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 524 FREE_C_HEAP_ARRAY(char, path, mtInternal); 525 } else { 526 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 527 char* cp_tmp = cp + old_len; 528 *cp_tmp = separator; 529 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 530 } 531 } 532 return cp; 533 } 534 535 // Scan the directory and append any jar or zip files found to path. 536 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 537 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 538 DIR* dir = os::opendir(directory); 539 if (dir == NULL) return path; 540 541 char dir_sep[2] = { '\0', '\0' }; 542 size_t directory_len = strlen(directory); 543 const char fileSep = *os::file_separator(); 544 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 545 546 /* Scan the directory for jars/zips, appending them to path. */ 547 struct dirent *entry; 548 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 549 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 550 const char* name = entry->d_name; 551 const char* ext = name + strlen(name) - 4; 552 bool isJarOrZip = ext > name && 553 (os::file_name_strcmp(ext, ".jar") == 0 || 554 os::file_name_strcmp(ext, ".zip") == 0); 555 if (isJarOrZip) { 556 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 557 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 558 path = add_to_path(path, jarpath, false); 559 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 560 } 561 } 562 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 563 os::closedir(dir); 564 return path; 565 } 566 567 // Parses a memory size specification string. 568 static bool atomull(const char *s, julong* result) { 569 julong n = 0; 570 int args_read = sscanf(s, JULONG_FORMAT, &n); 571 if (args_read != 1) { 572 return false; 573 } 574 while (*s != '\0' && isdigit(*s)) { 575 s++; 576 } 577 // 4705540: illegal if more characters are found after the first non-digit 578 if (strlen(s) > 1) { 579 return false; 580 } 581 switch (*s) { 582 case 'T': case 't': 583 *result = n * G * K; 584 // Check for overflow. 585 if (*result/((julong)G * K) != n) return false; 586 return true; 587 case 'G': case 'g': 588 *result = n * G; 589 if (*result/G != n) return false; 590 return true; 591 case 'M': case 'm': 592 *result = n * M; 593 if (*result/M != n) return false; 594 return true; 595 case 'K': case 'k': 596 *result = n * K; 597 if (*result/K != n) return false; 598 return true; 599 case '\0': 600 *result = n; 601 return true; 602 default: 603 return false; 604 } 605 } 606 607 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 608 if (size < min_size) return arg_too_small; 609 // Check that size will fit in a size_t (only relevant on 32-bit) 610 if (size > max_uintx) return arg_too_big; 611 return arg_in_range; 612 } 613 614 // Describe an argument out of range error 615 void Arguments::describe_range_error(ArgsRange errcode) { 616 switch(errcode) { 617 case arg_too_big: 618 jio_fprintf(defaultStream::error_stream(), 619 "The specified size exceeds the maximum " 620 "representable size.\n"); 621 break; 622 case arg_too_small: 623 case arg_unreadable: 624 case arg_in_range: 625 // do nothing for now 626 break; 627 default: 628 ShouldNotReachHere(); 629 } 630 } 631 632 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 633 return CommandLineFlags::boolAtPut(name, &value, origin); 634 } 635 636 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 637 double v; 638 if (sscanf(value, "%lf", &v) != 1) { 639 return false; 640 } 641 642 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 643 return true; 644 } 645 return false; 646 } 647 648 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 649 julong v; 650 intx intx_v; 651 bool is_neg = false; 652 // Check the sign first since atomull() parses only unsigned values. 653 if (*value == '-') { 654 if (!CommandLineFlags::intxAt(name, &intx_v)) { 655 return false; 656 } 657 value++; 658 is_neg = true; 659 } 660 if (!atomull(value, &v)) { 661 return false; 662 } 663 intx_v = (intx) v; 664 if (is_neg) { 665 intx_v = -intx_v; 666 } 667 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 668 return true; 669 } 670 uintx uintx_v = (uintx) v; 671 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 672 return true; 673 } 674 uint64_t uint64_t_v = (uint64_t) v; 675 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 676 return true; 677 } 678 return false; 679 } 680 681 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 682 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 683 // Contract: CommandLineFlags always returns a pointer that needs freeing. 684 FREE_C_HEAP_ARRAY(char, value, mtInternal); 685 return true; 686 } 687 688 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 689 const char* old_value = ""; 690 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 691 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 692 size_t new_len = strlen(new_value); 693 const char* value; 694 char* free_this_too = NULL; 695 if (old_len == 0) { 696 value = new_value; 697 } else if (new_len == 0) { 698 value = old_value; 699 } else { 700 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 701 // each new setting adds another LINE to the switch: 702 sprintf(buf, "%s\n%s", old_value, new_value); 703 value = buf; 704 free_this_too = buf; 705 } 706 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 707 // CommandLineFlags always returns a pointer that needs freeing. 708 FREE_C_HEAP_ARRAY(char, value, mtInternal); 709 if (free_this_too != NULL) { 710 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 711 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 712 } 713 return true; 714 } 715 716 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 717 718 // range of acceptable characters spelled out for portability reasons 719 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 720 #define BUFLEN 255 721 char name[BUFLEN+1]; 722 char dummy; 723 724 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 725 return set_bool_flag(name, false, origin); 726 } 727 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 728 return set_bool_flag(name, true, origin); 729 } 730 731 char punct; 732 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 733 const char* value = strchr(arg, '=') + 1; 734 Flag* flag = Flag::find_flag(name, strlen(name)); 735 if (flag != NULL && flag->is_ccstr()) { 736 if (flag->ccstr_accumulates()) { 737 return append_to_string_flag(name, value, origin); 738 } else { 739 if (value[0] == '\0') { 740 value = NULL; 741 } 742 return set_string_flag(name, value, origin); 743 } 744 } 745 } 746 747 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 748 const char* value = strchr(arg, '=') + 1; 749 // -XX:Foo:=xxx will reset the string flag to the given value. 750 if (value[0] == '\0') { 751 value = NULL; 752 } 753 return set_string_flag(name, value, origin); 754 } 755 756 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 757 #define SIGNED_NUMBER_RANGE "[-0123456789]" 758 #define NUMBER_RANGE "[0123456789]" 759 char value[BUFLEN + 1]; 760 char value2[BUFLEN + 1]; 761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 762 // Looks like a floating-point number -- try again with more lenient format string 763 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 764 return set_fp_numeric_flag(name, value, origin); 765 } 766 } 767 768 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 769 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 770 return set_numeric_flag(name, value, origin); 771 } 772 773 return false; 774 } 775 776 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 777 assert(bldarray != NULL, "illegal argument"); 778 779 if (arg == NULL) { 780 return; 781 } 782 783 int new_count = *count + 1; 784 785 // expand the array and add arg to the last element 786 if (*bldarray == NULL) { 787 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 788 } else { 789 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 790 } 791 (*bldarray)[*count] = strdup(arg); 792 *count = new_count; 793 } 794 795 void Arguments::build_jvm_args(const char* arg) { 796 add_string(&_jvm_args_array, &_num_jvm_args, arg); 797 } 798 799 void Arguments::build_jvm_flags(const char* arg) { 800 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 801 } 802 803 // utility function to return a string that concatenates all 804 // strings in a given char** array 805 const char* Arguments::build_resource_string(char** args, int count) { 806 if (args == NULL || count == 0) { 807 return NULL; 808 } 809 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 810 for (int i = 1; i < count; i++) { 811 length += strlen(args[i]) + 1; // add 1 for a space 812 } 813 char* s = NEW_RESOURCE_ARRAY(char, length); 814 strcpy(s, args[0]); 815 for (int j = 1; j < count; j++) { 816 strcat(s, " "); 817 strcat(s, args[j]); 818 } 819 return (const char*) s; 820 } 821 822 void Arguments::print_on(outputStream* st) { 823 st->print_cr("VM Arguments:"); 824 if (num_jvm_flags() > 0) { 825 st->print("jvm_flags: "); print_jvm_flags_on(st); 826 } 827 if (num_jvm_args() > 0) { 828 st->print("jvm_args: "); print_jvm_args_on(st); 829 } 830 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 831 if (_java_class_path != NULL) { 832 char* path = _java_class_path->value(); 833 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 834 } 835 st->print_cr("Launcher Type: %s", _sun_java_launcher); 836 } 837 838 void Arguments::print_jvm_flags_on(outputStream* st) { 839 if (_num_jvm_flags > 0) { 840 for (int i=0; i < _num_jvm_flags; i++) { 841 st->print("%s ", _jvm_flags_array[i]); 842 } 843 st->print_cr(""); 844 } 845 } 846 847 void Arguments::print_jvm_args_on(outputStream* st) { 848 if (_num_jvm_args > 0) { 849 for (int i=0; i < _num_jvm_args; i++) { 850 st->print("%s ", _jvm_args_array[i]); 851 } 852 st->print_cr(""); 853 } 854 } 855 856 bool Arguments::process_argument(const char* arg, 857 jboolean ignore_unrecognized, Flag::Flags origin) { 858 859 JDK_Version since = JDK_Version(); 860 861 if (parse_argument(arg, origin) || ignore_unrecognized) { 862 return true; 863 } 864 865 bool has_plus_minus = (*arg == '+' || *arg == '-'); 866 const char* const argname = has_plus_minus ? arg + 1 : arg; 867 if (is_newly_obsolete(arg, &since)) { 868 char version[256]; 869 since.to_string(version, sizeof(version)); 870 warning("ignoring option %s; support was removed in %s", argname, version); 871 return true; 872 } 873 874 // For locked flags, report a custom error message if available. 875 // Otherwise, report the standard unrecognized VM option. 876 877 size_t arg_len; 878 const char* equal_sign = strchr(argname, '='); 879 if (equal_sign == NULL) { 880 arg_len = strlen(argname); 881 } else { 882 arg_len = equal_sign - argname; 883 } 884 885 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true); 886 if (found_flag != NULL) { 887 char locked_message_buf[BUFLEN]; 888 found_flag->get_locked_message(locked_message_buf, BUFLEN); 889 if (strlen(locked_message_buf) == 0) { 890 if (found_flag->is_bool() && !has_plus_minus) { 891 jio_fprintf(defaultStream::error_stream(), 892 "Missing +/- setting for VM option '%s'\n", argname); 893 } else if (!found_flag->is_bool() && has_plus_minus) { 894 jio_fprintf(defaultStream::error_stream(), 895 "Unexpected +/- setting in VM option '%s'\n", argname); 896 } else { 897 jio_fprintf(defaultStream::error_stream(), 898 "Improperly specified VM option '%s'\n", argname); 899 } 900 } else { 901 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 902 } 903 } else { 904 jio_fprintf(defaultStream::error_stream(), 905 "Unrecognized VM option '%s'\n", argname); 906 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 907 if (fuzzy_matched != NULL) { 908 jio_fprintf(defaultStream::error_stream(), 909 "Did you mean '%s%s%s'?\n", 910 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 911 fuzzy_matched->_name, 912 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 913 } 914 } 915 916 // allow for commandline "commenting out" options like -XX:#+Verbose 917 return arg[0] == '#'; 918 } 919 920 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 921 FILE* stream = fopen(file_name, "rb"); 922 if (stream == NULL) { 923 if (should_exist) { 924 jio_fprintf(defaultStream::error_stream(), 925 "Could not open settings file %s\n", file_name); 926 return false; 927 } else { 928 return true; 929 } 930 } 931 932 char token[1024]; 933 int pos = 0; 934 935 bool in_white_space = true; 936 bool in_comment = false; 937 bool in_quote = false; 938 char quote_c = 0; 939 bool result = true; 940 941 int c = getc(stream); 942 while(c != EOF && pos < (int)(sizeof(token)-1)) { 943 if (in_white_space) { 944 if (in_comment) { 945 if (c == '\n') in_comment = false; 946 } else { 947 if (c == '#') in_comment = true; 948 else if (!isspace(c)) { 949 in_white_space = false; 950 token[pos++] = c; 951 } 952 } 953 } else { 954 if (c == '\n' || (!in_quote && isspace(c))) { 955 // token ends at newline, or at unquoted whitespace 956 // this allows a way to include spaces in string-valued options 957 token[pos] = '\0'; 958 logOption(token); 959 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 960 build_jvm_flags(token); 961 pos = 0; 962 in_white_space = true; 963 in_quote = false; 964 } else if (!in_quote && (c == '\'' || c == '"')) { 965 in_quote = true; 966 quote_c = c; 967 } else if (in_quote && (c == quote_c)) { 968 in_quote = false; 969 } else { 970 token[pos++] = c; 971 } 972 } 973 c = getc(stream); 974 } 975 if (pos > 0) { 976 token[pos] = '\0'; 977 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 978 build_jvm_flags(token); 979 } 980 fclose(stream); 981 return result; 982 } 983 984 //============================================================================================================= 985 // Parsing of properties (-D) 986 987 const char* Arguments::get_property(const char* key) { 988 return PropertyList_get_value(system_properties(), key); 989 } 990 991 bool Arguments::add_property(const char* prop) { 992 const char* eq = strchr(prop, '='); 993 char* key; 994 // ns must be static--its address may be stored in a SystemProperty object. 995 const static char ns[1] = {0}; 996 char* value = (char *)ns; 997 998 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 999 key = AllocateHeap(key_len + 1, mtInternal); 1000 strncpy(key, prop, key_len); 1001 key[key_len] = '\0'; 1002 1003 if (eq != NULL) { 1004 size_t value_len = strlen(prop) - key_len - 1; 1005 value = AllocateHeap(value_len + 1, mtInternal); 1006 strncpy(value, &prop[key_len + 1], value_len + 1); 1007 } 1008 1009 if (strcmp(key, "java.compiler") == 0) { 1010 process_java_compiler_argument(value); 1011 FreeHeap(key); 1012 if (eq != NULL) { 1013 FreeHeap(value); 1014 } 1015 return true; 1016 } else if (strcmp(key, "sun.java.command") == 0) { 1017 _java_command = value; 1018 1019 // Record value in Arguments, but let it get passed to Java. 1020 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 1021 // launcher.pid property is private and is processed 1022 // in process_sun_java_launcher_properties(); 1023 // the sun.java.launcher property is passed on to the java application 1024 FreeHeap(key); 1025 if (eq != NULL) { 1026 FreeHeap(value); 1027 } 1028 return true; 1029 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1030 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1031 // its value without going through the property list or making a Java call. 1032 _java_vendor_url_bug = value; 1033 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1034 PropertyList_unique_add(&_system_properties, key, value, true); 1035 return true; 1036 } 1037 // Create new property and add at the end of the list 1038 PropertyList_unique_add(&_system_properties, key, value); 1039 return true; 1040 } 1041 1042 //=========================================================================================================== 1043 // Setting int/mixed/comp mode flags 1044 1045 void Arguments::set_mode_flags(Mode mode) { 1046 // Set up default values for all flags. 1047 // If you add a flag to any of the branches below, 1048 // add a default value for it here. 1049 set_java_compiler(false); 1050 _mode = mode; 1051 1052 // Ensure Agent_OnLoad has the correct initial values. 1053 // This may not be the final mode; mode may change later in onload phase. 1054 PropertyList_unique_add(&_system_properties, "java.vm.info", 1055 (char*)VM_Version::vm_info_string(), false); 1056 1057 UseInterpreter = true; 1058 UseCompiler = true; 1059 UseLoopCounter = true; 1060 1061 #ifndef ZERO 1062 // Turn these off for mixed and comp. Leave them on for Zero. 1063 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1064 UseFastAccessorMethods = (mode == _int); 1065 } 1066 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1067 UseFastEmptyMethods = (mode == _int); 1068 } 1069 #endif 1070 1071 // Default values may be platform/compiler dependent - 1072 // use the saved values 1073 ClipInlining = Arguments::_ClipInlining; 1074 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1075 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1076 BackgroundCompilation = Arguments::_BackgroundCompilation; 1077 1078 // Change from defaults based on mode 1079 switch (mode) { 1080 default: 1081 ShouldNotReachHere(); 1082 break; 1083 case _int: 1084 UseCompiler = false; 1085 UseLoopCounter = false; 1086 AlwaysCompileLoopMethods = false; 1087 UseOnStackReplacement = false; 1088 break; 1089 case _mixed: 1090 // same as default 1091 break; 1092 case _comp: 1093 UseInterpreter = false; 1094 BackgroundCompilation = false; 1095 ClipInlining = false; 1096 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1097 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1098 // compile a level 4 (C2) and then continue executing it. 1099 if (TieredCompilation) { 1100 Tier3InvokeNotifyFreqLog = 0; 1101 Tier4InvocationThreshold = 0; 1102 } 1103 break; 1104 } 1105 } 1106 1107 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1108 // Conflict: required to use shared spaces (-Xshare:on), but 1109 // incompatible command line options were chosen. 1110 1111 static void no_shared_spaces() { 1112 if (RequireSharedSpaces) { 1113 jio_fprintf(defaultStream::error_stream(), 1114 "Class data sharing is inconsistent with other specified options.\n"); 1115 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1116 } else { 1117 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1118 } 1119 } 1120 #endif 1121 1122 void Arguments::set_tiered_flags() { 1123 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1124 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1125 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1126 } 1127 if (CompilationPolicyChoice < 2) { 1128 vm_exit_during_initialization( 1129 "Incompatible compilation policy selected", NULL); 1130 } 1131 // Increase the code cache size - tiered compiles a lot more. 1132 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1133 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1134 } 1135 if (!UseInterpreter) { // -Xcomp 1136 Tier3InvokeNotifyFreqLog = 0; 1137 Tier4InvocationThreshold = 0; 1138 } 1139 } 1140 1141 #if INCLUDE_ALL_GCS 1142 static void disable_adaptive_size_policy(const char* collector_name) { 1143 if (UseAdaptiveSizePolicy) { 1144 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1145 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1146 collector_name); 1147 } 1148 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1149 } 1150 } 1151 1152 void Arguments::set_parnew_gc_flags() { 1153 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1154 "control point invariant"); 1155 assert(UseParNewGC, "Error"); 1156 1157 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1158 disable_adaptive_size_policy("UseParNewGC"); 1159 1160 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1161 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1162 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1163 } else if (ParallelGCThreads == 0) { 1164 jio_fprintf(defaultStream::error_stream(), 1165 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1166 vm_exit(1); 1167 } 1168 1169 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1170 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1171 // we set them to 1024 and 1024. 1172 // See CR 6362902. 1173 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1174 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1175 } 1176 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1177 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1178 } 1179 1180 // AlwaysTenure flag should make ParNew promote all at first collection. 1181 // See CR 6362902. 1182 if (AlwaysTenure) { 1183 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1184 } 1185 // When using compressed oops, we use local overflow stacks, 1186 // rather than using a global overflow list chained through 1187 // the klass word of the object's pre-image. 1188 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1189 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1190 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1191 } 1192 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1193 } 1194 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1195 } 1196 1197 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1198 // sparc/solaris for certain applications, but would gain from 1199 // further optimization and tuning efforts, and would almost 1200 // certainly gain from analysis of platform and environment. 1201 void Arguments::set_cms_and_parnew_gc_flags() { 1202 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1203 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1204 1205 // If we are using CMS, we prefer to UseParNewGC, 1206 // unless explicitly forbidden. 1207 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1208 FLAG_SET_ERGO(bool, UseParNewGC, true); 1209 } 1210 1211 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1212 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1213 1214 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1215 // as needed. 1216 if (UseParNewGC) { 1217 set_parnew_gc_flags(); 1218 } 1219 1220 size_t max_heap = align_size_down(MaxHeapSize, 1221 CardTableRS::ct_max_alignment_constraint()); 1222 1223 // Now make adjustments for CMS 1224 intx tenuring_default = (intx)6; 1225 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1226 1227 // Preferred young gen size for "short" pauses: 1228 // upper bound depends on # of threads and NewRatio. 1229 const uintx parallel_gc_threads = 1230 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1231 const size_t preferred_max_new_size_unaligned = 1232 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1233 size_t preferred_max_new_size = 1234 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1235 1236 // Unless explicitly requested otherwise, size young gen 1237 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1238 1239 // If either MaxNewSize or NewRatio is set on the command line, 1240 // assume the user is trying to set the size of the young gen. 1241 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1242 1243 // Set MaxNewSize to our calculated preferred_max_new_size unless 1244 // NewSize was set on the command line and it is larger than 1245 // preferred_max_new_size. 1246 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1247 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1248 } else { 1249 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1250 } 1251 if (PrintGCDetails && Verbose) { 1252 // Too early to use gclog_or_tty 1253 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1254 } 1255 1256 // Code along this path potentially sets NewSize and OldSize 1257 if (PrintGCDetails && Verbose) { 1258 // Too early to use gclog_or_tty 1259 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1260 " initial_heap_size: " SIZE_FORMAT 1261 " max_heap: " SIZE_FORMAT, 1262 min_heap_size(), InitialHeapSize, max_heap); 1263 } 1264 size_t min_new = preferred_max_new_size; 1265 if (FLAG_IS_CMDLINE(NewSize)) { 1266 min_new = NewSize; 1267 } 1268 if (max_heap > min_new && min_heap_size() > min_new) { 1269 // Unless explicitly requested otherwise, make young gen 1270 // at least min_new, and at most preferred_max_new_size. 1271 if (FLAG_IS_DEFAULT(NewSize)) { 1272 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1273 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1274 if (PrintGCDetails && Verbose) { 1275 // Too early to use gclog_or_tty 1276 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1277 } 1278 } 1279 // Unless explicitly requested otherwise, size old gen 1280 // so it's NewRatio x of NewSize. 1281 if (FLAG_IS_DEFAULT(OldSize)) { 1282 if (max_heap > NewSize) { 1283 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1284 if (PrintGCDetails && Verbose) { 1285 // Too early to use gclog_or_tty 1286 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1287 } 1288 } 1289 } 1290 } 1291 } 1292 // Unless explicitly requested otherwise, definitely 1293 // promote all objects surviving "tenuring_default" scavenges. 1294 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1295 FLAG_IS_DEFAULT(SurvivorRatio)) { 1296 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1297 } 1298 // If we decided above (or user explicitly requested) 1299 // `promote all' (via MaxTenuringThreshold := 0), 1300 // prefer minuscule survivor spaces so as not to waste 1301 // space for (non-existent) survivors 1302 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1303 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1304 } 1305 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1306 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1307 // This is done in order to make ParNew+CMS configuration to work 1308 // with YoungPLABSize and OldPLABSize options. 1309 // See CR 6362902. 1310 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1311 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1312 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1313 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1314 // the value (either from the command line or ergonomics) of 1315 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1316 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1317 } else { 1318 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1319 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1320 // we'll let it to take precedence. 1321 jio_fprintf(defaultStream::error_stream(), 1322 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1323 " options are specified for the CMS collector." 1324 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1325 } 1326 } 1327 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1328 // OldPLAB sizing manually turned off: Use a larger default setting, 1329 // unless it was manually specified. This is because a too-low value 1330 // will slow down scavenges. 1331 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1332 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1333 } 1334 } 1335 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1336 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1337 // If either of the static initialization defaults have changed, note this 1338 // modification. 1339 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1340 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1341 } 1342 if (PrintGCDetails && Verbose) { 1343 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1344 MarkStackSize / K, MarkStackSizeMax / K); 1345 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1346 } 1347 } 1348 #endif // INCLUDE_ALL_GCS 1349 1350 void set_object_alignment() { 1351 // Object alignment. 1352 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1353 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1354 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1355 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1356 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1357 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1358 1359 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1360 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1361 1362 // Oop encoding heap max 1363 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1364 1365 #if INCLUDE_ALL_GCS 1366 // Set CMS global values 1367 CompactibleFreeListSpace::set_cms_values(); 1368 #endif // INCLUDE_ALL_GCS 1369 } 1370 1371 bool verify_object_alignment() { 1372 // Object alignment. 1373 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1374 jio_fprintf(defaultStream::error_stream(), 1375 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1376 (int)ObjectAlignmentInBytes); 1377 return false; 1378 } 1379 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1380 jio_fprintf(defaultStream::error_stream(), 1381 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1382 (int)ObjectAlignmentInBytes, BytesPerLong); 1383 return false; 1384 } 1385 // It does not make sense to have big object alignment 1386 // since a space lost due to alignment will be greater 1387 // then a saved space from compressed oops. 1388 if ((int)ObjectAlignmentInBytes > 256) { 1389 jio_fprintf(defaultStream::error_stream(), 1390 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1391 (int)ObjectAlignmentInBytes); 1392 return false; 1393 } 1394 // In case page size is very small. 1395 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1396 jio_fprintf(defaultStream::error_stream(), 1397 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1398 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1399 return false; 1400 } 1401 return true; 1402 } 1403 1404 uintx Arguments::max_heap_for_compressed_oops() { 1405 // Avoid sign flip. 1406 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1407 // We need to fit both the NULL page and the heap into the memory budget, while 1408 // keeping alignment constraints of the heap. To guarantee the latter, as the 1409 // NULL page is located before the heap, we pad the NULL page to the conservative 1410 // maximum alignment that the GC may ever impose upon the heap. 1411 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1412 _conservative_max_heap_alignment); 1413 1414 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1415 NOT_LP64(ShouldNotReachHere(); return 0); 1416 } 1417 1418 bool Arguments::should_auto_select_low_pause_collector() { 1419 if (UseAutoGCSelectPolicy && 1420 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1421 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1422 if (PrintGCDetails) { 1423 // Cannot use gclog_or_tty yet. 1424 tty->print_cr("Automatic selection of the low pause collector" 1425 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1426 } 1427 return true; 1428 } 1429 return false; 1430 } 1431 1432 void Arguments::set_use_compressed_oops() { 1433 #ifndef ZERO 1434 #ifdef _LP64 1435 // MaxHeapSize is not set up properly at this point, but 1436 // the only value that can override MaxHeapSize if we are 1437 // to use UseCompressedOops is InitialHeapSize. 1438 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1439 1440 if (max_heap_size <= max_heap_for_compressed_oops()) { 1441 #if !defined(COMPILER1) || defined(TIERED) 1442 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1443 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1444 } 1445 #endif 1446 #ifdef _WIN64 1447 if (UseLargePages && UseCompressedOops) { 1448 // Cannot allocate guard pages for implicit checks in indexed addressing 1449 // mode, when large pages are specified on windows. 1450 // This flag could be switched ON if narrow oop base address is set to 0, 1451 // see code in Universe::initialize_heap(). 1452 Universe::set_narrow_oop_use_implicit_null_checks(false); 1453 } 1454 #endif // _WIN64 1455 } else { 1456 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1457 warning("Max heap size too large for Compressed Oops"); 1458 FLAG_SET_DEFAULT(UseCompressedOops, false); 1459 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1460 } 1461 } 1462 #endif // _LP64 1463 #endif // ZERO 1464 } 1465 1466 1467 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1468 // set_use_compressed_oops(). 1469 void Arguments::set_use_compressed_klass_ptrs() { 1470 #ifndef ZERO 1471 #ifdef _LP64 1472 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1473 if (!UseCompressedOops) { 1474 if (UseCompressedClassPointers) { 1475 warning("UseCompressedClassPointers requires UseCompressedOops"); 1476 } 1477 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1478 } else { 1479 // Turn on UseCompressedClassPointers too 1480 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1481 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1482 } 1483 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1484 if (UseCompressedClassPointers) { 1485 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1486 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1487 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1488 } 1489 } 1490 } 1491 #endif // _LP64 1492 #endif // !ZERO 1493 } 1494 1495 void Arguments::set_conservative_max_heap_alignment() { 1496 // The conservative maximum required alignment for the heap is the maximum of 1497 // the alignments imposed by several sources: any requirements from the heap 1498 // itself, the collector policy and the maximum page size we may run the VM 1499 // with. 1500 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1501 #if INCLUDE_ALL_GCS 1502 if (UseParallelGC) { 1503 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1504 } else if (UseG1GC) { 1505 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1506 } 1507 #endif // INCLUDE_ALL_GCS 1508 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(), 1509 CollectorPolicy::compute_heap_alignment()); 1510 } 1511 1512 void Arguments::set_ergonomics_flags() { 1513 1514 if (os::is_server_class_machine()) { 1515 // If no other collector is requested explicitly, 1516 // let the VM select the collector based on 1517 // machine class and automatic selection policy. 1518 if (!UseSerialGC && 1519 !UseConcMarkSweepGC && 1520 !UseG1GC && 1521 !UseParNewGC && 1522 FLAG_IS_DEFAULT(UseParallelGC)) { 1523 if (should_auto_select_low_pause_collector()) { 1524 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1525 } else { 1526 FLAG_SET_ERGO(bool, UseParallelGC, true); 1527 } 1528 } 1529 } 1530 #ifdef COMPILER2 1531 // Shared spaces work fine with other GCs but causes bytecode rewriting 1532 // to be disabled, which hurts interpreter performance and decreases 1533 // server performance. When -server is specified, keep the default off 1534 // unless it is asked for. Future work: either add bytecode rewriting 1535 // at link time, or rewrite bytecodes in non-shared methods. 1536 if (!DumpSharedSpaces && !RequireSharedSpaces && 1537 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1538 no_shared_spaces(); 1539 } 1540 #endif 1541 1542 set_conservative_max_heap_alignment(); 1543 1544 #ifndef ZERO 1545 #ifdef _LP64 1546 set_use_compressed_oops(); 1547 1548 // set_use_compressed_klass_ptrs() must be called after calling 1549 // set_use_compressed_oops(). 1550 set_use_compressed_klass_ptrs(); 1551 1552 // Also checks that certain machines are slower with compressed oops 1553 // in vm_version initialization code. 1554 #endif // _LP64 1555 #endif // !ZERO 1556 } 1557 1558 void Arguments::set_parallel_gc_flags() { 1559 assert(UseParallelGC || UseParallelOldGC, "Error"); 1560 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1561 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1562 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1563 } 1564 FLAG_SET_DEFAULT(UseParallelGC, true); 1565 1566 // If no heap maximum was requested explicitly, use some reasonable fraction 1567 // of the physical memory, up to a maximum of 1GB. 1568 FLAG_SET_DEFAULT(ParallelGCThreads, 1569 Abstract_VM_Version::parallel_worker_threads()); 1570 if (ParallelGCThreads == 0) { 1571 jio_fprintf(defaultStream::error_stream(), 1572 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1573 vm_exit(1); 1574 } 1575 1576 1577 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1578 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1579 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1580 // See CR 6362902 for details. 1581 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1582 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1583 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1584 } 1585 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1586 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1587 } 1588 } 1589 1590 if (UseParallelOldGC) { 1591 // Par compact uses lower default values since they are treated as 1592 // minimums. These are different defaults because of the different 1593 // interpretation and are not ergonomically set. 1594 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1595 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1596 } 1597 } 1598 } 1599 1600 void Arguments::set_g1_gc_flags() { 1601 assert(UseG1GC, "Error"); 1602 #ifdef COMPILER1 1603 FastTLABRefill = false; 1604 #endif 1605 FLAG_SET_DEFAULT(ParallelGCThreads, 1606 Abstract_VM_Version::parallel_worker_threads()); 1607 if (ParallelGCThreads == 0) { 1608 FLAG_SET_DEFAULT(ParallelGCThreads, 1609 Abstract_VM_Version::parallel_worker_threads()); 1610 } 1611 1612 // MarkStackSize will be set (if it hasn't been set by the user) 1613 // when concurrent marking is initialized. 1614 // Its value will be based upon the number of parallel marking threads. 1615 // But we do set the maximum mark stack size here. 1616 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1617 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1618 } 1619 1620 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1621 // In G1, we want the default GC overhead goal to be higher than 1622 // say in PS. So we set it here to 10%. Otherwise the heap might 1623 // be expanded more aggressively than we would like it to. In 1624 // fact, even 10% seems to not be high enough in some cases 1625 // (especially small GC stress tests that the main thing they do 1626 // is allocation). We might consider increase it further. 1627 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1628 } 1629 1630 if (PrintGCDetails && Verbose) { 1631 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1632 MarkStackSize / K, MarkStackSizeMax / K); 1633 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1634 } 1635 } 1636 1637 julong Arguments::limit_by_allocatable_memory(julong limit) { 1638 julong max_allocatable; 1639 julong result = limit; 1640 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1641 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1642 } 1643 return result; 1644 } 1645 1646 void Arguments::set_heap_size() { 1647 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1648 // Deprecated flag 1649 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1650 } 1651 1652 const julong phys_mem = 1653 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1654 : (julong)MaxRAM; 1655 1656 // If the maximum heap size has not been set with -Xmx, 1657 // then set it as fraction of the size of physical memory, 1658 // respecting the maximum and minimum sizes of the heap. 1659 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1660 julong reasonable_max = phys_mem / MaxRAMFraction; 1661 1662 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1663 // Small physical memory, so use a minimum fraction of it for the heap 1664 reasonable_max = phys_mem / MinRAMFraction; 1665 } else { 1666 // Not-small physical memory, so require a heap at least 1667 // as large as MaxHeapSize 1668 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1669 } 1670 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1671 // Limit the heap size to ErgoHeapSizeLimit 1672 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1673 } 1674 if (UseCompressedOops) { 1675 // Limit the heap size to the maximum possible when using compressed oops 1676 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1677 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1678 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1679 // but it should be not less than default MaxHeapSize. 1680 max_coop_heap -= HeapBaseMinAddress; 1681 } 1682 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1683 } 1684 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1685 1686 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1687 // An initial heap size was specified on the command line, 1688 // so be sure that the maximum size is consistent. Done 1689 // after call to limit_by_allocatable_memory because that 1690 // method might reduce the allocation size. 1691 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1692 } 1693 1694 if (PrintGCDetails && Verbose) { 1695 // Cannot use gclog_or_tty yet. 1696 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1697 } 1698 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1699 } 1700 1701 // If the minimum or initial heap_size have not been set or requested to be set 1702 // ergonomically, set them accordingly. 1703 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1704 julong reasonable_minimum = (julong)(OldSize + NewSize); 1705 1706 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1707 1708 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1709 1710 if (InitialHeapSize == 0) { 1711 julong reasonable_initial = phys_mem / InitialRAMFraction; 1712 1713 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1714 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1715 1716 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1717 1718 if (PrintGCDetails && Verbose) { 1719 // Cannot use gclog_or_tty yet. 1720 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1721 } 1722 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1723 } 1724 // If the minimum heap size has not been set (via -Xms), 1725 // synchronize with InitialHeapSize to avoid errors with the default value. 1726 if (min_heap_size() == 0) { 1727 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1728 if (PrintGCDetails && Verbose) { 1729 // Cannot use gclog_or_tty yet. 1730 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1731 } 1732 } 1733 } 1734 } 1735 1736 // This must be called after ergonomics because we want bytecode rewriting 1737 // if the server compiler is used, or if UseSharedSpaces is disabled. 1738 void Arguments::set_bytecode_flags() { 1739 // Better not attempt to store into a read-only space. 1740 if (UseSharedSpaces) { 1741 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1742 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1743 } 1744 1745 if (!RewriteBytecodes) { 1746 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1747 } 1748 } 1749 1750 // Aggressive optimization flags -XX:+AggressiveOpts 1751 void Arguments::set_aggressive_opts_flags() { 1752 #ifdef COMPILER2 1753 if (AggressiveUnboxing) { 1754 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1755 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1756 } else if (!EliminateAutoBox) { 1757 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1758 AggressiveUnboxing = false; 1759 } 1760 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1761 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1762 } else if (!DoEscapeAnalysis) { 1763 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1764 AggressiveUnboxing = false; 1765 } 1766 } 1767 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1768 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1769 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1770 } 1771 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1772 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1773 } 1774 1775 // Feed the cache size setting into the JDK 1776 char buffer[1024]; 1777 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1778 add_property(buffer); 1779 } 1780 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1781 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1782 } 1783 #endif 1784 1785 if (AggressiveOpts) { 1786 // Sample flag setting code 1787 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1788 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1789 // } 1790 } 1791 } 1792 1793 //=========================================================================================================== 1794 // Parsing of java.compiler property 1795 1796 void Arguments::process_java_compiler_argument(char* arg) { 1797 // For backwards compatibility, Djava.compiler=NONE or "" 1798 // causes us to switch to -Xint mode UNLESS -Xdebug 1799 // is also specified. 1800 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1801 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1802 } 1803 } 1804 1805 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1806 _sun_java_launcher = strdup(launcher); 1807 if (strcmp("gamma", _sun_java_launcher) == 0) { 1808 _created_by_gamma_launcher = true; 1809 } 1810 } 1811 1812 bool Arguments::created_by_java_launcher() { 1813 assert(_sun_java_launcher != NULL, "property must have value"); 1814 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1815 } 1816 1817 bool Arguments::created_by_gamma_launcher() { 1818 return _created_by_gamma_launcher; 1819 } 1820 1821 //=========================================================================================================== 1822 // Parsing of main arguments 1823 1824 bool Arguments::verify_interval(uintx val, uintx min, 1825 uintx max, const char* name) { 1826 // Returns true iff value is in the inclusive interval [min..max] 1827 // false, otherwise. 1828 if (val >= min && val <= max) { 1829 return true; 1830 } 1831 jio_fprintf(defaultStream::error_stream(), 1832 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1833 " and " UINTX_FORMAT "\n", 1834 name, val, min, max); 1835 return false; 1836 } 1837 1838 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1839 // Returns true if given value is at least specified min threshold 1840 // false, otherwise. 1841 if (val >= min ) { 1842 return true; 1843 } 1844 jio_fprintf(defaultStream::error_stream(), 1845 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1846 name, val, min); 1847 return false; 1848 } 1849 1850 bool Arguments::verify_percentage(uintx value, const char* name) { 1851 if (value <= 100) { 1852 return true; 1853 } 1854 jio_fprintf(defaultStream::error_stream(), 1855 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1856 name, value); 1857 return false; 1858 } 1859 1860 #if !INCLUDE_ALL_GCS 1861 #ifdef ASSERT 1862 static bool verify_serial_gc_flags() { 1863 return (UseSerialGC && 1864 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1865 UseParallelGC || UseParallelOldGC)); 1866 } 1867 #endif // ASSERT 1868 #endif // INCLUDE_ALL_GCS 1869 1870 // check if do gclog rotation 1871 // +UseGCLogFileRotation is a must, 1872 // no gc log rotation when log file not supplied or 1873 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1874 void check_gclog_consistency() { 1875 if (UseGCLogFileRotation) { 1876 if ((Arguments::gc_log_filename() == NULL) || 1877 (NumberOfGCLogFiles == 0) || 1878 (GCLogFileSize == 0)) { 1879 jio_fprintf(defaultStream::output_stream(), 1880 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>[k|K|m|M|g|G]\n" 1881 "where num_of_file > 0 and num_of_size > 0\n" 1882 "GC log rotation is turned off\n"); 1883 UseGCLogFileRotation = false; 1884 } 1885 } 1886 1887 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1888 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1889 jio_fprintf(defaultStream::output_stream(), 1890 "GCLogFileSize changed to minimum 8K\n"); 1891 } 1892 } 1893 1894 // This function is called for -Xloggc:<filename>, it can be used 1895 // to check if a given file name(or string) conforms to the following 1896 // specification: 1897 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1898 // %p and %t only allowed once. We only limit usage of filename not path 1899 bool is_filename_valid(const char *file_name) { 1900 const char* p = file_name; 1901 char file_sep = os::file_separator()[0]; 1902 const char* cp; 1903 // skip prefix path 1904 for (cp = file_name; *cp != '\0'; cp++) { 1905 if (*cp == '/' || *cp == file_sep) { 1906 p = cp + 1; 1907 } 1908 } 1909 1910 int count_p = 0; 1911 int count_t = 0; 1912 while (*p != '\0') { 1913 if ((*p >= '0' && *p <= '9') || 1914 (*p >= 'A' && *p <= 'Z') || 1915 (*p >= 'a' && *p <= 'z') || 1916 *p == '-' || 1917 *p == '_' || 1918 *p == '.') { 1919 p++; 1920 continue; 1921 } 1922 if (*p == '%') { 1923 if(*(p + 1) == 'p') { 1924 p += 2; 1925 count_p ++; 1926 continue; 1927 } 1928 if (*(p + 1) == 't') { 1929 p += 2; 1930 count_t ++; 1931 continue; 1932 } 1933 } 1934 return false; 1935 } 1936 return count_p < 2 && count_t < 2; 1937 } 1938 1939 // Check consistency of GC selection 1940 bool Arguments::check_gc_consistency() { 1941 check_gclog_consistency(); 1942 bool status = true; 1943 // Ensure that the user has not selected conflicting sets 1944 // of collectors. [Note: this check is merely a user convenience; 1945 // collectors over-ride each other so that only a non-conflicting 1946 // set is selected; however what the user gets is not what they 1947 // may have expected from the combination they asked for. It's 1948 // better to reduce user confusion by not allowing them to 1949 // select conflicting combinations. 1950 uint i = 0; 1951 if (UseSerialGC) i++; 1952 if (UseConcMarkSweepGC || UseParNewGC) i++; 1953 if (UseParallelGC || UseParallelOldGC) i++; 1954 if (UseG1GC) i++; 1955 if (i > 1) { 1956 jio_fprintf(defaultStream::error_stream(), 1957 "Conflicting collector combinations in option list; " 1958 "please refer to the release notes for the combinations " 1959 "allowed\n"); 1960 status = false; 1961 } 1962 return status; 1963 } 1964 1965 void Arguments::check_deprecated_gcs() { 1966 if (UseConcMarkSweepGC && !UseParNewGC) { 1967 warning("Using the DefNew young collector with the CMS collector is deprecated " 1968 "and will likely be removed in a future release"); 1969 } 1970 1971 if (UseParNewGC && !UseConcMarkSweepGC) { 1972 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 1973 // set up UseSerialGC properly, so that can't be used in the check here. 1974 warning("Using the ParNew young collector with the Serial old collector is deprecated " 1975 "and will likely be removed in a future release"); 1976 } 1977 1978 if (CMSIncrementalMode) { 1979 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 1980 } 1981 } 1982 1983 void Arguments::check_deprecated_gc_flags() { 1984 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 1985 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 1986 "and will likely be removed in future release"); 1987 } 1988 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 1989 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 1990 "Use MaxRAMFraction instead."); 1991 } 1992 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 1993 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 1994 } 1995 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 1996 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 1997 } 1998 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 1999 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2000 } 2001 } 2002 2003 // Check stack pages settings 2004 bool Arguments::check_stack_pages() 2005 { 2006 bool status = true; 2007 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2008 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2009 // greater stack shadow pages can't generate instruction to bang stack 2010 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2011 return status; 2012 } 2013 2014 // Check the consistency of vm_init_args 2015 bool Arguments::check_vm_args_consistency() { 2016 // Method for adding checks for flag consistency. 2017 // The intent is to warn the user of all possible conflicts, 2018 // before returning an error. 2019 // Note: Needs platform-dependent factoring. 2020 bool status = true; 2021 2022 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 2023 // builds so the cost of stack banging can be measured. 2024 #if (defined(PRODUCT) && defined(SOLARIS)) 2025 if (!UseBoundThreads && !UseStackBanging) { 2026 jio_fprintf(defaultStream::error_stream(), 2027 "-UseStackBanging conflicts with -UseBoundThreads\n"); 2028 2029 status = false; 2030 } 2031 #endif 2032 2033 if (TLABRefillWasteFraction == 0) { 2034 jio_fprintf(defaultStream::error_stream(), 2035 "TLABRefillWasteFraction should be a denominator, " 2036 "not " SIZE_FORMAT "\n", 2037 TLABRefillWasteFraction); 2038 status = false; 2039 } 2040 2041 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2042 "AdaptiveSizePolicyWeight"); 2043 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2044 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 2045 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 2046 2047 // Divide by bucket size to prevent a large size from causing rollover when 2048 // calculating amount of memory needed to be allocated for the String table. 2049 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2050 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2051 2052 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2053 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2054 2055 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 2056 jio_fprintf(defaultStream::error_stream(), 2057 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2058 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 2059 MinHeapFreeRatio, MaxHeapFreeRatio); 2060 status = false; 2061 } 2062 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2063 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 2064 2065 // Min/MaxMetaspaceFreeRatio 2066 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2067 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2068 2069 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2070 jio_fprintf(defaultStream::error_stream(), 2071 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2072 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2073 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2074 MinMetaspaceFreeRatio, 2075 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2076 MaxMetaspaceFreeRatio); 2077 status = false; 2078 } 2079 2080 // Trying to keep 100% free is not practical 2081 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2082 2083 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2084 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2085 } 2086 2087 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2088 // Settings to encourage splitting. 2089 if (!FLAG_IS_CMDLINE(NewRatio)) { 2090 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2091 } 2092 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2093 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2094 } 2095 } 2096 2097 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2098 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2099 if (GCTimeLimit == 100) { 2100 // Turn off gc-overhead-limit-exceeded checks 2101 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2102 } 2103 2104 status = status && check_gc_consistency(); 2105 status = status && check_stack_pages(); 2106 2107 if (CMSIncrementalMode) { 2108 if (!UseConcMarkSweepGC) { 2109 jio_fprintf(defaultStream::error_stream(), 2110 "error: invalid argument combination.\n" 2111 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2112 "selected in order\nto use CMSIncrementalMode.\n"); 2113 status = false; 2114 } else { 2115 status = status && verify_percentage(CMSIncrementalDutyCycle, 2116 "CMSIncrementalDutyCycle"); 2117 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2118 "CMSIncrementalDutyCycleMin"); 2119 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2120 "CMSIncrementalSafetyFactor"); 2121 status = status && verify_percentage(CMSIncrementalOffset, 2122 "CMSIncrementalOffset"); 2123 status = status && verify_percentage(CMSExpAvgFactor, 2124 "CMSExpAvgFactor"); 2125 // If it was not set on the command line, set 2126 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2127 if (CMSInitiatingOccupancyFraction < 0) { 2128 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2129 } 2130 } 2131 } 2132 2133 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2134 // insists that we hold the requisite locks so that the iteration is 2135 // MT-safe. For the verification at start-up and shut-down, we don't 2136 // yet have a good way of acquiring and releasing these locks, 2137 // which are not visible at the CollectedHeap level. We want to 2138 // be able to acquire these locks and then do the iteration rather 2139 // than just disable the lock verification. This will be fixed under 2140 // bug 4788986. 2141 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2142 if (VerifyDuringStartup) { 2143 warning("Heap verification at start-up disabled " 2144 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2145 VerifyDuringStartup = false; // Disable verification at start-up 2146 } 2147 2148 if (VerifyBeforeExit) { 2149 warning("Heap verification at shutdown disabled " 2150 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2151 VerifyBeforeExit = false; // Disable verification at shutdown 2152 } 2153 } 2154 2155 // Note: only executed in non-PRODUCT mode 2156 if (!UseAsyncConcMarkSweepGC && 2157 (ExplicitGCInvokesConcurrent || 2158 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2159 jio_fprintf(defaultStream::error_stream(), 2160 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2161 " with -UseAsyncConcMarkSweepGC"); 2162 status = false; 2163 } 2164 2165 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2166 2167 #if INCLUDE_ALL_GCS 2168 if (UseG1GC) { 2169 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2170 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2171 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2172 2173 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2174 "InitiatingHeapOccupancyPercent"); 2175 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2176 "G1RefProcDrainInterval"); 2177 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2178 "G1ConcMarkStepDurationMillis"); 2179 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2180 "G1ConcRSHotCardLimit"); 2181 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2182 "G1ConcRSLogCacheSize"); 2183 } 2184 if (UseConcMarkSweepGC) { 2185 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2186 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2187 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2188 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2189 2190 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2191 2192 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2193 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2194 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2195 2196 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2197 2198 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2199 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2200 2201 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2202 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2203 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2204 2205 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2206 2207 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2208 2209 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2210 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2211 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2212 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2213 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2214 } 2215 2216 if (UseParallelGC || UseParallelOldGC) { 2217 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2218 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2219 2220 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2221 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2222 2223 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2224 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2225 2226 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2227 2228 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2229 } 2230 #endif // INCLUDE_ALL_GCS 2231 2232 status = status && verify_interval(RefDiscoveryPolicy, 2233 ReferenceProcessor::DiscoveryPolicyMin, 2234 ReferenceProcessor::DiscoveryPolicyMax, 2235 "RefDiscoveryPolicy"); 2236 2237 // Limit the lower bound of this flag to 1 as it is used in a division 2238 // expression. 2239 status = status && verify_interval(TLABWasteTargetPercent, 2240 1, 100, "TLABWasteTargetPercent"); 2241 2242 status = status && verify_object_alignment(); 2243 2244 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2245 "CompressedClassSpaceSize"); 2246 2247 status = status && verify_interval(MarkStackSizeMax, 2248 1, (max_jint - 1), "MarkStackSizeMax"); 2249 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2250 2251 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2252 2253 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2254 2255 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2256 2257 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2258 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2259 2260 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2261 2262 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2263 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2264 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2265 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2266 2267 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2268 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2269 2270 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2271 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2272 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2273 2274 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2275 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2276 2277 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2278 // just for that, so hardcode here. 2279 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2280 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2281 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2282 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2283 2284 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2285 2286 if (PrintNMTStatistics) { 2287 #if INCLUDE_NMT 2288 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2289 #endif // INCLUDE_NMT 2290 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2291 PrintNMTStatistics = false; 2292 #if INCLUDE_NMT 2293 } 2294 #endif 2295 } 2296 2297 // Need to limit the extent of the padding to reasonable size. 2298 // 8K is well beyond the reasonable HW cache line size, even with the 2299 // aggressive prefetching, while still leaving the room for segregating 2300 // among the distinct pages. 2301 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2302 jio_fprintf(defaultStream::error_stream(), 2303 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2304 ContendedPaddingWidth, 0, 8192); 2305 status = false; 2306 } 2307 2308 // Need to enforce the padding not to break the existing field alignments. 2309 // It is sufficient to check against the largest type size. 2310 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2311 jio_fprintf(defaultStream::error_stream(), 2312 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2313 ContendedPaddingWidth, BytesPerLong); 2314 status = false; 2315 } 2316 2317 // Check lower bounds of the code cache 2318 // Template Interpreter code is approximately 3X larger in debug builds. 2319 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2320 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2321 jio_fprintf(defaultStream::error_stream(), 2322 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2323 os::vm_page_size()/K); 2324 status = false; 2325 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2326 jio_fprintf(defaultStream::error_stream(), 2327 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2328 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2329 status = false; 2330 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2331 jio_fprintf(defaultStream::error_stream(), 2332 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2333 min_code_cache_size/K); 2334 status = false; 2335 } else if (ReservedCodeCacheSize > 2*G) { 2336 // Code cache size larger than MAXINT is not supported. 2337 jio_fprintf(defaultStream::error_stream(), 2338 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2339 (2*G)/M); 2340 status = false; 2341 } 2342 2343 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2344 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2345 2346 // TieredCompilation needs at least 2 compiler threads. 2347 const int num_min_compiler_threads = (TieredCompilation) ? 2 : 1; 2348 status &=verify_min_value(CICompilerCount, num_min_compiler_threads, "CICompilerCount"); 2349 2350 return status; 2351 } 2352 2353 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2354 const char* option_type) { 2355 if (ignore) return false; 2356 2357 const char* spacer = " "; 2358 if (option_type == NULL) { 2359 option_type = ++spacer; // Set both to the empty string. 2360 } 2361 2362 if (os::obsolete_option(option)) { 2363 jio_fprintf(defaultStream::error_stream(), 2364 "Obsolete %s%soption: %s\n", option_type, spacer, 2365 option->optionString); 2366 return false; 2367 } else { 2368 jio_fprintf(defaultStream::error_stream(), 2369 "Unrecognized %s%soption: %s\n", option_type, spacer, 2370 option->optionString); 2371 return true; 2372 } 2373 } 2374 2375 static const char* user_assertion_options[] = { 2376 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2377 }; 2378 2379 static const char* system_assertion_options[] = { 2380 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2381 }; 2382 2383 // Return true if any of the strings in null-terminated array 'names' matches. 2384 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2385 // the option must match exactly. 2386 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2387 bool tail_allowed) { 2388 for (/* empty */; *names != NULL; ++names) { 2389 if (match_option(option, *names, tail)) { 2390 if (**tail == '\0' || tail_allowed && **tail == ':') { 2391 return true; 2392 } 2393 } 2394 } 2395 return false; 2396 } 2397 2398 bool Arguments::parse_uintx(const char* value, 2399 uintx* uintx_arg, 2400 uintx min_size) { 2401 2402 // Check the sign first since atomull() parses only unsigned values. 2403 bool value_is_positive = !(*value == '-'); 2404 2405 if (value_is_positive) { 2406 julong n; 2407 bool good_return = atomull(value, &n); 2408 if (good_return) { 2409 bool above_minimum = n >= min_size; 2410 bool value_is_too_large = n > max_uintx; 2411 2412 if (above_minimum && !value_is_too_large) { 2413 *uintx_arg = n; 2414 return true; 2415 } 2416 } 2417 } 2418 return false; 2419 } 2420 2421 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2422 julong* long_arg, 2423 julong min_size) { 2424 if (!atomull(s, long_arg)) return arg_unreadable; 2425 return check_memory_size(*long_arg, min_size); 2426 } 2427 2428 // Parse JavaVMInitArgs structure 2429 2430 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2431 // For components of the system classpath. 2432 SysClassPath scp(Arguments::get_sysclasspath()); 2433 bool scp_assembly_required = false; 2434 2435 // Save default settings for some mode flags 2436 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2437 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2438 Arguments::_ClipInlining = ClipInlining; 2439 Arguments::_BackgroundCompilation = BackgroundCompilation; 2440 2441 // Setup flags for mixed which is the default 2442 set_mode_flags(_mixed); 2443 2444 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2445 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2446 if (result != JNI_OK) { 2447 return result; 2448 } 2449 2450 // Parse JavaVMInitArgs structure passed in 2451 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2452 if (result != JNI_OK) { 2453 return result; 2454 } 2455 2456 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2457 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2458 if (result != JNI_OK) { 2459 return result; 2460 } 2461 2462 // Do final processing now that all arguments have been parsed 2463 result = finalize_vm_init_args(&scp, scp_assembly_required); 2464 if (result != JNI_OK) { 2465 return result; 2466 } 2467 2468 return JNI_OK; 2469 } 2470 2471 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2472 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2473 // are dealing with -agentpath (case where name is a path), otherwise with 2474 // -agentlib 2475 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2476 char *_name; 2477 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2478 size_t _len_hprof, _len_jdwp, _len_prefix; 2479 2480 if (is_path) { 2481 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2482 return false; 2483 } 2484 2485 _name++; // skip past last path separator 2486 _len_prefix = strlen(JNI_LIB_PREFIX); 2487 2488 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2489 return false; 2490 } 2491 2492 _name += _len_prefix; 2493 _len_hprof = strlen(_hprof); 2494 _len_jdwp = strlen(_jdwp); 2495 2496 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2497 _name += _len_hprof; 2498 } 2499 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2500 _name += _len_jdwp; 2501 } 2502 else { 2503 return false; 2504 } 2505 2506 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2507 return false; 2508 } 2509 2510 return true; 2511 } 2512 2513 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2514 return true; 2515 } 2516 2517 return false; 2518 } 2519 2520 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2521 SysClassPath* scp_p, 2522 bool* scp_assembly_required_p, 2523 Flag::Flags origin) { 2524 // Remaining part of option string 2525 const char* tail; 2526 2527 // iterate over arguments 2528 for (int index = 0; index < args->nOptions; index++) { 2529 bool is_absolute_path = false; // for -agentpath vs -agentlib 2530 2531 const JavaVMOption* option = args->options + index; 2532 2533 if (!match_option(option, "-Djava.class.path", &tail) && 2534 !match_option(option, "-Dsun.java.command", &tail) && 2535 !match_option(option, "-Dsun.java.launcher", &tail)) { 2536 2537 // add all jvm options to the jvm_args string. This string 2538 // is used later to set the java.vm.args PerfData string constant. 2539 // the -Djava.class.path and the -Dsun.java.command options are 2540 // omitted from jvm_args string as each have their own PerfData 2541 // string constant object. 2542 build_jvm_args(option->optionString); 2543 } 2544 2545 // -verbose:[class/gc/jni] 2546 if (match_option(option, "-verbose", &tail)) { 2547 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2548 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2549 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2550 } else if (!strcmp(tail, ":gc")) { 2551 FLAG_SET_CMDLINE(bool, PrintGC, true); 2552 } else if (!strcmp(tail, ":jni")) { 2553 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2554 } 2555 // -da / -ea / -disableassertions / -enableassertions 2556 // These accept an optional class/package name separated by a colon, e.g., 2557 // -da:java.lang.Thread. 2558 } else if (match_option(option, user_assertion_options, &tail, true)) { 2559 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2560 if (*tail == '\0') { 2561 JavaAssertions::setUserClassDefault(enable); 2562 } else { 2563 assert(*tail == ':', "bogus match by match_option()"); 2564 JavaAssertions::addOption(tail + 1, enable); 2565 } 2566 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2567 } else if (match_option(option, system_assertion_options, &tail, false)) { 2568 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2569 JavaAssertions::setSystemClassDefault(enable); 2570 // -bootclasspath: 2571 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2572 scp_p->reset_path(tail); 2573 *scp_assembly_required_p = true; 2574 // -bootclasspath/a: 2575 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2576 scp_p->add_suffix(tail); 2577 *scp_assembly_required_p = true; 2578 // -bootclasspath/p: 2579 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2580 scp_p->add_prefix(tail); 2581 *scp_assembly_required_p = true; 2582 // -Xrun 2583 } else if (match_option(option, "-Xrun", &tail)) { 2584 if (tail != NULL) { 2585 const char* pos = strchr(tail, ':'); 2586 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2587 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2588 name[len] = '\0'; 2589 2590 char *options = NULL; 2591 if(pos != NULL) { 2592 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2593 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2594 } 2595 #if !INCLUDE_JVMTI 2596 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2597 jio_fprintf(defaultStream::error_stream(), 2598 "Profiling and debugging agents are not supported in this VM\n"); 2599 return JNI_ERR; 2600 } 2601 #endif // !INCLUDE_JVMTI 2602 add_init_library(name, options); 2603 } 2604 // -agentlib and -agentpath 2605 } else if (match_option(option, "-agentlib:", &tail) || 2606 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2607 if(tail != NULL) { 2608 const char* pos = strchr(tail, '='); 2609 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2610 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2611 name[len] = '\0'; 2612 2613 char *options = NULL; 2614 if(pos != NULL) { 2615 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2616 } 2617 #if !INCLUDE_JVMTI 2618 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2619 jio_fprintf(defaultStream::error_stream(), 2620 "Profiling and debugging agents are not supported in this VM\n"); 2621 return JNI_ERR; 2622 } 2623 #endif // !INCLUDE_JVMTI 2624 add_init_agent(name, options, is_absolute_path); 2625 } 2626 // -javaagent 2627 } else if (match_option(option, "-javaagent:", &tail)) { 2628 #if !INCLUDE_JVMTI 2629 jio_fprintf(defaultStream::error_stream(), 2630 "Instrumentation agents are not supported in this VM\n"); 2631 return JNI_ERR; 2632 #else 2633 if(tail != NULL) { 2634 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2635 add_init_agent("instrument", options, false); 2636 } 2637 #endif // !INCLUDE_JVMTI 2638 // -Xnoclassgc 2639 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2640 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2641 // -Xincgc: i-CMS 2642 } else if (match_option(option, "-Xincgc", &tail)) { 2643 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2644 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2645 // -Xnoincgc: no i-CMS 2646 } else if (match_option(option, "-Xnoincgc", &tail)) { 2647 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2648 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2649 // -Xconcgc 2650 } else if (match_option(option, "-Xconcgc", &tail)) { 2651 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2652 // -Xnoconcgc 2653 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2654 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2655 // -Xbatch 2656 } else if (match_option(option, "-Xbatch", &tail)) { 2657 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2658 // -Xmn for compatibility with other JVM vendors 2659 } else if (match_option(option, "-Xmn", &tail)) { 2660 julong long_initial_young_size = 0; 2661 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2662 if (errcode != arg_in_range) { 2663 jio_fprintf(defaultStream::error_stream(), 2664 "Invalid initial young generation size: %s\n", option->optionString); 2665 describe_range_error(errcode); 2666 return JNI_EINVAL; 2667 } 2668 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2669 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2670 // -Xms 2671 } else if (match_option(option, "-Xms", &tail)) { 2672 julong long_initial_heap_size = 0; 2673 // an initial heap size of 0 means automatically determine 2674 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2675 if (errcode != arg_in_range) { 2676 jio_fprintf(defaultStream::error_stream(), 2677 "Invalid initial heap size: %s\n", option->optionString); 2678 describe_range_error(errcode); 2679 return JNI_EINVAL; 2680 } 2681 set_min_heap_size((uintx)long_initial_heap_size); 2682 // Currently the minimum size and the initial heap sizes are the same. 2683 // Can be overridden with -XX:InitialHeapSize. 2684 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2685 // -Xmx 2686 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2687 julong long_max_heap_size = 0; 2688 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2689 if (errcode != arg_in_range) { 2690 jio_fprintf(defaultStream::error_stream(), 2691 "Invalid maximum heap size: %s\n", option->optionString); 2692 describe_range_error(errcode); 2693 return JNI_EINVAL; 2694 } 2695 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2696 // Xmaxf 2697 } else if (match_option(option, "-Xmaxf", &tail)) { 2698 char* err; 2699 int maxf = (int)(strtod(tail, &err) * 100); 2700 if (*err != '\0' || maxf < 0 || maxf > 100) { 2701 jio_fprintf(defaultStream::error_stream(), 2702 "Bad max heap free percentage size: %s\n", 2703 option->optionString); 2704 return JNI_EINVAL; 2705 } else { 2706 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2707 } 2708 // Xminf 2709 } else if (match_option(option, "-Xminf", &tail)) { 2710 char* err; 2711 int minf = (int)(strtod(tail, &err) * 100); 2712 if (*err != '\0' || minf < 0 || minf > 100) { 2713 jio_fprintf(defaultStream::error_stream(), 2714 "Bad min heap free percentage size: %s\n", 2715 option->optionString); 2716 return JNI_EINVAL; 2717 } else { 2718 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2719 } 2720 // -Xss 2721 } else if (match_option(option, "-Xss", &tail)) { 2722 julong long_ThreadStackSize = 0; 2723 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2724 if (errcode != arg_in_range) { 2725 jio_fprintf(defaultStream::error_stream(), 2726 "Invalid thread stack size: %s\n", option->optionString); 2727 describe_range_error(errcode); 2728 return JNI_EINVAL; 2729 } 2730 // Internally track ThreadStackSize in units of 1024 bytes. 2731 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2732 round_to((int)long_ThreadStackSize, K) / K); 2733 // -Xoss 2734 } else if (match_option(option, "-Xoss", &tail)) { 2735 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2736 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2737 julong long_CodeCacheExpansionSize = 0; 2738 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2739 if (errcode != arg_in_range) { 2740 jio_fprintf(defaultStream::error_stream(), 2741 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2742 os::vm_page_size()/K); 2743 return JNI_EINVAL; 2744 } 2745 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2746 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2747 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2748 julong long_ReservedCodeCacheSize = 0; 2749 2750 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2751 if (errcode != arg_in_range) { 2752 jio_fprintf(defaultStream::error_stream(), 2753 "Invalid maximum code cache size: %s.\n", option->optionString); 2754 return JNI_EINVAL; 2755 } 2756 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2757 //-XX:IncreaseFirstTierCompileThresholdAt= 2758 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2759 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2760 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2761 jio_fprintf(defaultStream::error_stream(), 2762 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2763 option->optionString); 2764 return JNI_EINVAL; 2765 } 2766 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2767 // -green 2768 } else if (match_option(option, "-green", &tail)) { 2769 jio_fprintf(defaultStream::error_stream(), 2770 "Green threads support not available\n"); 2771 return JNI_EINVAL; 2772 // -native 2773 } else if (match_option(option, "-native", &tail)) { 2774 // HotSpot always uses native threads, ignore silently for compatibility 2775 // -Xsqnopause 2776 } else if (match_option(option, "-Xsqnopause", &tail)) { 2777 // EVM option, ignore silently for compatibility 2778 // -Xrs 2779 } else if (match_option(option, "-Xrs", &tail)) { 2780 // Classic/EVM option, new functionality 2781 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2782 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2783 // change default internal VM signals used - lower case for back compat 2784 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2785 // -Xoptimize 2786 } else if (match_option(option, "-Xoptimize", &tail)) { 2787 // EVM option, ignore silently for compatibility 2788 // -Xprof 2789 } else if (match_option(option, "-Xprof", &tail)) { 2790 #if INCLUDE_FPROF 2791 _has_profile = true; 2792 #else // INCLUDE_FPROF 2793 jio_fprintf(defaultStream::error_stream(), 2794 "Flat profiling is not supported in this VM.\n"); 2795 return JNI_ERR; 2796 #endif // INCLUDE_FPROF 2797 // -Xconcurrentio 2798 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2799 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2800 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2801 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2802 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2803 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2804 2805 // -Xinternalversion 2806 } else if (match_option(option, "-Xinternalversion", &tail)) { 2807 jio_fprintf(defaultStream::output_stream(), "%s\n", 2808 VM_Version::internal_vm_info_string()); 2809 vm_exit(0); 2810 #ifndef PRODUCT 2811 // -Xprintflags 2812 } else if (match_option(option, "-Xprintflags", &tail)) { 2813 CommandLineFlags::printFlags(tty, false); 2814 vm_exit(0); 2815 #endif 2816 // -D 2817 } else if (match_option(option, "-D", &tail)) { 2818 if (!add_property(tail)) { 2819 return JNI_ENOMEM; 2820 } 2821 // Out of the box management support 2822 if (match_option(option, "-Dcom.sun.management", &tail)) { 2823 #if INCLUDE_MANAGEMENT 2824 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2825 #else 2826 jio_fprintf(defaultStream::output_stream(), 2827 "-Dcom.sun.management is not supported in this VM.\n"); 2828 return JNI_ERR; 2829 #endif 2830 } 2831 // -Xint 2832 } else if (match_option(option, "-Xint", &tail)) { 2833 set_mode_flags(_int); 2834 // -Xmixed 2835 } else if (match_option(option, "-Xmixed", &tail)) { 2836 set_mode_flags(_mixed); 2837 // -Xcomp 2838 } else if (match_option(option, "-Xcomp", &tail)) { 2839 // for testing the compiler; turn off all flags that inhibit compilation 2840 set_mode_flags(_comp); 2841 // -Xshare:dump 2842 } else if (match_option(option, "-Xshare:dump", &tail)) { 2843 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2844 set_mode_flags(_int); // Prevent compilation, which creates objects 2845 // -Xshare:on 2846 } else if (match_option(option, "-Xshare:on", &tail)) { 2847 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2848 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2849 // -Xshare:auto 2850 } else if (match_option(option, "-Xshare:auto", &tail)) { 2851 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2852 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2853 // -Xshare:off 2854 } else if (match_option(option, "-Xshare:off", &tail)) { 2855 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2856 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2857 // -Xverify 2858 } else if (match_option(option, "-Xverify", &tail)) { 2859 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2860 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2861 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2862 } else if (strcmp(tail, ":remote") == 0) { 2863 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2864 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2865 } else if (strcmp(tail, ":none") == 0) { 2866 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2867 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2868 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2869 return JNI_EINVAL; 2870 } 2871 // -Xdebug 2872 } else if (match_option(option, "-Xdebug", &tail)) { 2873 // note this flag has been used, then ignore 2874 set_xdebug_mode(true); 2875 // -Xnoagent 2876 } else if (match_option(option, "-Xnoagent", &tail)) { 2877 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2878 } else if (match_option(option, "-Xboundthreads", &tail)) { 2879 // Bind user level threads to kernel threads (Solaris only) 2880 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2881 } else if (match_option(option, "-Xloggc:", &tail)) { 2882 // Redirect GC output to the file. -Xloggc:<filename> 2883 // ostream_init_log(), when called will use this filename 2884 // to initialize a fileStream. 2885 _gc_log_filename = strdup(tail); 2886 if (!is_filename_valid(_gc_log_filename)) { 2887 jio_fprintf(defaultStream::output_stream(), 2888 "Invalid file name for use with -Xloggc: Filename can only contain the " 2889 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2890 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2891 return JNI_EINVAL; 2892 } 2893 FLAG_SET_CMDLINE(bool, PrintGC, true); 2894 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2895 2896 // JNI hooks 2897 } else if (match_option(option, "-Xcheck", &tail)) { 2898 if (!strcmp(tail, ":jni")) { 2899 #if !INCLUDE_JNI_CHECK 2900 warning("JNI CHECKING is not supported in this VM"); 2901 #else 2902 CheckJNICalls = true; 2903 #endif // INCLUDE_JNI_CHECK 2904 } else if (is_bad_option(option, args->ignoreUnrecognized, 2905 "check")) { 2906 return JNI_EINVAL; 2907 } 2908 } else if (match_option(option, "vfprintf", &tail)) { 2909 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2910 } else if (match_option(option, "exit", &tail)) { 2911 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2912 } else if (match_option(option, "abort", &tail)) { 2913 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2914 // -XX:+AggressiveHeap 2915 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2916 2917 // This option inspects the machine and attempts to set various 2918 // parameters to be optimal for long-running, memory allocation 2919 // intensive jobs. It is intended for machines with large 2920 // amounts of cpu and memory. 2921 2922 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2923 // VM, but we may not be able to represent the total physical memory 2924 // available (like having 8gb of memory on a box but using a 32bit VM). 2925 // Thus, we need to make sure we're using a julong for intermediate 2926 // calculations. 2927 julong initHeapSize; 2928 julong total_memory = os::physical_memory(); 2929 2930 if (total_memory < (julong)256*M) { 2931 jio_fprintf(defaultStream::error_stream(), 2932 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2933 vm_exit(1); 2934 } 2935 2936 // The heap size is half of available memory, or (at most) 2937 // all of possible memory less 160mb (leaving room for the OS 2938 // when using ISM). This is the maximum; because adaptive sizing 2939 // is turned on below, the actual space used may be smaller. 2940 2941 initHeapSize = MIN2(total_memory / (julong)2, 2942 total_memory - (julong)160*M); 2943 2944 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2945 2946 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2947 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2948 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2949 // Currently the minimum size and the initial heap sizes are the same. 2950 set_min_heap_size(initHeapSize); 2951 } 2952 if (FLAG_IS_DEFAULT(NewSize)) { 2953 // Make the young generation 3/8ths of the total heap. 2954 FLAG_SET_CMDLINE(uintx, NewSize, 2955 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2956 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2957 } 2958 2959 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 2960 FLAG_SET_DEFAULT(UseLargePages, true); 2961 #endif 2962 2963 // Increase some data structure sizes for efficiency 2964 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2965 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2966 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2967 2968 // See the OldPLABSize comment below, but replace 'after promotion' 2969 // with 'after copying'. YoungPLABSize is the size of the survivor 2970 // space per-gc-thread buffers. The default is 4kw. 2971 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2972 2973 // OldPLABSize is the size of the buffers in the old gen that 2974 // UseParallelGC uses to promote live data that doesn't fit in the 2975 // survivor spaces. At any given time, there's one for each gc thread. 2976 // The default size is 1kw. These buffers are rarely used, since the 2977 // survivor spaces are usually big enough. For specjbb, however, there 2978 // are occasions when there's lots of live data in the young gen 2979 // and we end up promoting some of it. We don't have a definite 2980 // explanation for why bumping OldPLABSize helps, but the theory 2981 // is that a bigger PLAB results in retaining something like the 2982 // original allocation order after promotion, which improves mutator 2983 // locality. A minor effect may be that larger PLABs reduce the 2984 // number of PLAB allocation events during gc. The value of 8kw 2985 // was arrived at by experimenting with specjbb. 2986 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2987 2988 // Enable parallel GC and adaptive generation sizing 2989 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2990 FLAG_SET_DEFAULT(ParallelGCThreads, 2991 Abstract_VM_Version::parallel_worker_threads()); 2992 2993 // Encourage steady state memory management 2994 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2995 2996 // This appears to improve mutator locality 2997 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2998 2999 // Get around early Solaris scheduling bug 3000 // (affinity vs other jobs on system) 3001 // but disallow DR and offlining (5008695). 3002 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3003 3004 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3005 // The last option must always win. 3006 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3007 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3008 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3009 // The last option must always win. 3010 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3011 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3012 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3013 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3014 jio_fprintf(defaultStream::error_stream(), 3015 "Please use CMSClassUnloadingEnabled in place of " 3016 "CMSPermGenSweepingEnabled in the future\n"); 3017 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3018 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3019 jio_fprintf(defaultStream::error_stream(), 3020 "Please use -XX:+UseGCOverheadLimit in place of " 3021 "-XX:+UseGCTimeLimit in the future\n"); 3022 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3023 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3024 jio_fprintf(defaultStream::error_stream(), 3025 "Please use -XX:-UseGCOverheadLimit in place of " 3026 "-XX:-UseGCTimeLimit in the future\n"); 3027 // The TLE options are for compatibility with 1.3 and will be 3028 // removed without notice in a future release. These options 3029 // are not to be documented. 3030 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3031 // No longer used. 3032 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3033 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3034 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3035 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3036 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3037 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3038 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3039 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3040 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3041 // No longer used. 3042 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3043 julong long_tlab_size = 0; 3044 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3045 if (errcode != arg_in_range) { 3046 jio_fprintf(defaultStream::error_stream(), 3047 "Invalid TLAB size: %s\n", option->optionString); 3048 describe_range_error(errcode); 3049 return JNI_EINVAL; 3050 } 3051 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3052 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3053 // No longer used. 3054 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3055 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3056 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3057 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3058 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3059 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3060 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3061 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3062 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3063 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3064 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3065 #if defined(DTRACE_ENABLED) 3066 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3067 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3068 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3069 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3070 #else // defined(DTRACE_ENABLED) 3071 jio_fprintf(defaultStream::error_stream(), 3072 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3073 return JNI_EINVAL; 3074 #endif // defined(DTRACE_ENABLED) 3075 #ifdef ASSERT 3076 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3077 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3078 // disable scavenge before parallel mark-compact 3079 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3080 #endif 3081 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3082 julong cms_blocks_to_claim = (julong)atol(tail); 3083 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3084 jio_fprintf(defaultStream::error_stream(), 3085 "Please use -XX:OldPLABSize in place of " 3086 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3087 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3088 julong cms_blocks_to_claim = (julong)atol(tail); 3089 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3090 jio_fprintf(defaultStream::error_stream(), 3091 "Please use -XX:OldPLABSize in place of " 3092 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3093 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3094 julong old_plab_size = 0; 3095 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3096 if (errcode != arg_in_range) { 3097 jio_fprintf(defaultStream::error_stream(), 3098 "Invalid old PLAB size: %s\n", option->optionString); 3099 describe_range_error(errcode); 3100 return JNI_EINVAL; 3101 } 3102 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3103 jio_fprintf(defaultStream::error_stream(), 3104 "Please use -XX:OldPLABSize in place of " 3105 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3106 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3107 julong young_plab_size = 0; 3108 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3109 if (errcode != arg_in_range) { 3110 jio_fprintf(defaultStream::error_stream(), 3111 "Invalid young PLAB size: %s\n", option->optionString); 3112 describe_range_error(errcode); 3113 return JNI_EINVAL; 3114 } 3115 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3116 jio_fprintf(defaultStream::error_stream(), 3117 "Please use -XX:YoungPLABSize in place of " 3118 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3119 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3120 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3121 julong stack_size = 0; 3122 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3123 if (errcode != arg_in_range) { 3124 jio_fprintf(defaultStream::error_stream(), 3125 "Invalid mark stack size: %s\n", option->optionString); 3126 describe_range_error(errcode); 3127 return JNI_EINVAL; 3128 } 3129 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3130 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3131 julong max_stack_size = 0; 3132 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3133 if (errcode != arg_in_range) { 3134 jio_fprintf(defaultStream::error_stream(), 3135 "Invalid maximum mark stack size: %s\n", 3136 option->optionString); 3137 describe_range_error(errcode); 3138 return JNI_EINVAL; 3139 } 3140 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3141 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3142 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3143 uintx conc_threads = 0; 3144 if (!parse_uintx(tail, &conc_threads, 1)) { 3145 jio_fprintf(defaultStream::error_stream(), 3146 "Invalid concurrent threads: %s\n", option->optionString); 3147 return JNI_EINVAL; 3148 } 3149 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3150 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3151 julong max_direct_memory_size = 0; 3152 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3153 if (errcode != arg_in_range) { 3154 jio_fprintf(defaultStream::error_stream(), 3155 "Invalid maximum direct memory size: %s\n", 3156 option->optionString); 3157 describe_range_error(errcode); 3158 return JNI_EINVAL; 3159 } 3160 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3161 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3162 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3163 // away and will cause VM initialization failures! 3164 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3165 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3166 #if !INCLUDE_MANAGEMENT 3167 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3168 jio_fprintf(defaultStream::error_stream(), 3169 "ManagementServer is not supported in this VM.\n"); 3170 return JNI_ERR; 3171 #endif // INCLUDE_MANAGEMENT 3172 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3173 // Skip -XX:Flags= since that case has already been handled 3174 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3175 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3176 return JNI_EINVAL; 3177 } 3178 } 3179 // Unknown option 3180 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3181 return JNI_ERR; 3182 } 3183 } 3184 3185 // Change the default value for flags which have different default values 3186 // when working with older JDKs. 3187 #ifdef LINUX 3188 if (JDK_Version::current().compare_major(6) <= 0 && 3189 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3190 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3191 } 3192 #endif // LINUX 3193 return JNI_OK; 3194 } 3195 3196 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3197 // This must be done after all -D arguments have been processed. 3198 scp_p->expand_endorsed(); 3199 3200 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3201 // Assemble the bootclasspath elements into the final path. 3202 Arguments::set_sysclasspath(scp_p->combined_path()); 3203 } 3204 3205 // This must be done after all arguments have been processed. 3206 // java_compiler() true means set to "NONE" or empty. 3207 if (java_compiler() && !xdebug_mode()) { 3208 // For backwards compatibility, we switch to interpreted mode if 3209 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3210 // not specified. 3211 set_mode_flags(_int); 3212 } 3213 if (CompileThreshold == 0) { 3214 set_mode_flags(_int); 3215 } 3216 3217 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3218 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3219 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3220 } 3221 3222 #ifndef COMPILER2 3223 // Don't degrade server performance for footprint 3224 if (FLAG_IS_DEFAULT(UseLargePages) && 3225 MaxHeapSize < LargePageHeapSizeThreshold) { 3226 // No need for large granularity pages w/small heaps. 3227 // Note that large pages are enabled/disabled for both the 3228 // Java heap and the code cache. 3229 FLAG_SET_DEFAULT(UseLargePages, false); 3230 } 3231 3232 #else 3233 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3234 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3235 } 3236 #endif 3237 3238 #ifndef TIERED 3239 // Tiered compilation is undefined. 3240 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3241 #endif 3242 3243 // If we are running in a headless jre, force java.awt.headless property 3244 // to be true unless the property has already been set. 3245 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3246 if (os::is_headless_jre()) { 3247 const char* headless = Arguments::get_property("java.awt.headless"); 3248 if (headless == NULL) { 3249 char envbuffer[128]; 3250 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3251 if (!add_property("java.awt.headless=true")) { 3252 return JNI_ENOMEM; 3253 } 3254 } else { 3255 char buffer[256]; 3256 strcpy(buffer, "java.awt.headless="); 3257 strcat(buffer, envbuffer); 3258 if (!add_property(buffer)) { 3259 return JNI_ENOMEM; 3260 } 3261 } 3262 } 3263 } 3264 3265 if (!check_vm_args_consistency()) { 3266 return JNI_ERR; 3267 } 3268 3269 return JNI_OK; 3270 } 3271 3272 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3273 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3274 scp_assembly_required_p); 3275 } 3276 3277 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3278 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3279 scp_assembly_required_p); 3280 } 3281 3282 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3283 const int N_MAX_OPTIONS = 64; 3284 const int OPTION_BUFFER_SIZE = 1024; 3285 char buffer[OPTION_BUFFER_SIZE]; 3286 3287 // The variable will be ignored if it exceeds the length of the buffer. 3288 // Don't check this variable if user has special privileges 3289 // (e.g. unix su command). 3290 if (os::getenv(name, buffer, sizeof(buffer)) && 3291 !os::have_special_privileges()) { 3292 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3293 jio_fprintf(defaultStream::error_stream(), 3294 "Picked up %s: %s\n", name, buffer); 3295 char* rd = buffer; // pointer to the input string (rd) 3296 int i; 3297 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3298 while (isspace(*rd)) rd++; // skip whitespace 3299 if (*rd == 0) break; // we re done when the input string is read completely 3300 3301 // The output, option string, overwrites the input string. 3302 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3303 // input string (rd). 3304 char* wrt = rd; 3305 3306 options[i++].optionString = wrt; // Fill in option 3307 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3308 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3309 int quote = *rd; // matching quote to look for 3310 rd++; // don't copy open quote 3311 while (*rd != quote) { // include everything (even spaces) up until quote 3312 if (*rd == 0) { // string termination means unmatched string 3313 jio_fprintf(defaultStream::error_stream(), 3314 "Unmatched quote in %s\n", name); 3315 return JNI_ERR; 3316 } 3317 *wrt++ = *rd++; // copy to option string 3318 } 3319 rd++; // don't copy close quote 3320 } else { 3321 *wrt++ = *rd++; // copy to option string 3322 } 3323 } 3324 // Need to check if we're done before writing a NULL, 3325 // because the write could be to the byte that rd is pointing to. 3326 if (*rd++ == 0) { 3327 *wrt = 0; 3328 break; 3329 } 3330 *wrt = 0; // Zero terminate option 3331 } 3332 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3333 JavaVMInitArgs vm_args; 3334 vm_args.version = JNI_VERSION_1_2; 3335 vm_args.options = options; 3336 vm_args.nOptions = i; 3337 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3338 3339 if (PrintVMOptions) { 3340 const char* tail; 3341 for (int i = 0; i < vm_args.nOptions; i++) { 3342 const JavaVMOption *option = vm_args.options + i; 3343 if (match_option(option, "-XX:", &tail)) { 3344 logOption(tail); 3345 } 3346 } 3347 } 3348 3349 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3350 } 3351 return JNI_OK; 3352 } 3353 3354 void Arguments::set_shared_spaces_flags() { 3355 if (DumpSharedSpaces) { 3356 if (RequireSharedSpaces) { 3357 warning("cannot dump shared archive while using shared archive"); 3358 } 3359 UseSharedSpaces = false; 3360 #ifdef _LP64 3361 if (!UseCompressedOops || !UseCompressedClassPointers) { 3362 vm_exit_during_initialization( 3363 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3364 } 3365 } else { 3366 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces. 3367 if (!UseCompressedOops || !UseCompressedClassPointers) { 3368 no_shared_spaces(); 3369 } 3370 #endif 3371 } 3372 } 3373 3374 #if !INCLUDE_ALL_GCS 3375 static void force_serial_gc() { 3376 FLAG_SET_DEFAULT(UseSerialGC, true); 3377 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3378 UNSUPPORTED_GC_OPTION(UseG1GC); 3379 UNSUPPORTED_GC_OPTION(UseParallelGC); 3380 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3381 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3382 UNSUPPORTED_GC_OPTION(UseParNewGC); 3383 } 3384 #endif // INCLUDE_ALL_GCS 3385 3386 // Sharing support 3387 // Construct the path to the archive 3388 static char* get_shared_archive_path() { 3389 char *shared_archive_path; 3390 if (SharedArchiveFile == NULL) { 3391 char jvm_path[JVM_MAXPATHLEN]; 3392 os::jvm_path(jvm_path, sizeof(jvm_path)); 3393 char *end = strrchr(jvm_path, *os::file_separator()); 3394 if (end != NULL) *end = '\0'; 3395 size_t jvm_path_len = strlen(jvm_path); 3396 size_t file_sep_len = strlen(os::file_separator()); 3397 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3398 file_sep_len + 20, mtInternal); 3399 if (shared_archive_path != NULL) { 3400 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3401 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3402 strncat(shared_archive_path, "classes.jsa", 11); 3403 } 3404 } else { 3405 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3406 if (shared_archive_path != NULL) { 3407 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3408 } 3409 } 3410 return shared_archive_path; 3411 } 3412 3413 #ifndef PRODUCT 3414 // Determine whether LogVMOutput should be implicitly turned on. 3415 static bool use_vm_log() { 3416 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3417 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3418 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3419 PrintAssembly || TraceDeoptimization || TraceDependencies || 3420 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3421 return true; 3422 } 3423 3424 #ifdef COMPILER1 3425 if (PrintC1Statistics) { 3426 return true; 3427 } 3428 #endif // COMPILER1 3429 3430 #ifdef COMPILER2 3431 if (PrintOptoAssembly || PrintOptoStatistics) { 3432 return true; 3433 } 3434 #endif // COMPILER2 3435 3436 return false; 3437 } 3438 #endif // PRODUCT 3439 3440 // Parse entry point called from JNI_CreateJavaVM 3441 3442 jint Arguments::parse(const JavaVMInitArgs* args) { 3443 3444 // Remaining part of option string 3445 const char* tail; 3446 3447 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3448 const char* hotspotrc = ".hotspotrc"; 3449 bool settings_file_specified = false; 3450 bool needs_hotspotrc_warning = false; 3451 3452 const char* flags_file; 3453 int index; 3454 for (index = 0; index < args->nOptions; index++) { 3455 const JavaVMOption *option = args->options + index; 3456 if (match_option(option, "-XX:Flags=", &tail)) { 3457 flags_file = tail; 3458 settings_file_specified = true; 3459 } 3460 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3461 PrintVMOptions = true; 3462 } 3463 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3464 PrintVMOptions = false; 3465 } 3466 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3467 IgnoreUnrecognizedVMOptions = true; 3468 } 3469 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3470 IgnoreUnrecognizedVMOptions = false; 3471 } 3472 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3473 CommandLineFlags::printFlags(tty, false); 3474 vm_exit(0); 3475 } 3476 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3477 #if INCLUDE_NMT 3478 MemTracker::init_tracking_options(tail); 3479 #else 3480 jio_fprintf(defaultStream::error_stream(), 3481 "Native Memory Tracking is not supported in this VM\n"); 3482 return JNI_ERR; 3483 #endif 3484 } 3485 3486 3487 #ifndef PRODUCT 3488 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3489 CommandLineFlags::printFlags(tty, true); 3490 vm_exit(0); 3491 } 3492 #endif 3493 } 3494 3495 if (IgnoreUnrecognizedVMOptions) { 3496 // uncast const to modify the flag args->ignoreUnrecognized 3497 *(jboolean*)(&args->ignoreUnrecognized) = true; 3498 } 3499 3500 // Parse specified settings file 3501 if (settings_file_specified) { 3502 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3503 return JNI_EINVAL; 3504 } 3505 } else { 3506 #ifdef ASSERT 3507 // Parse default .hotspotrc settings file 3508 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3509 return JNI_EINVAL; 3510 } 3511 #else 3512 struct stat buf; 3513 if (os::stat(hotspotrc, &buf) == 0) { 3514 needs_hotspotrc_warning = true; 3515 } 3516 #endif 3517 } 3518 3519 if (PrintVMOptions) { 3520 for (index = 0; index < args->nOptions; index++) { 3521 const JavaVMOption *option = args->options + index; 3522 if (match_option(option, "-XX:", &tail)) { 3523 logOption(tail); 3524 } 3525 } 3526 } 3527 3528 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3529 jint result = parse_vm_init_args(args); 3530 if (result != JNI_OK) { 3531 return result; 3532 } 3533 3534 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3535 SharedArchivePath = get_shared_archive_path(); 3536 if (SharedArchivePath == NULL) { 3537 return JNI_ENOMEM; 3538 } 3539 3540 // Delay warning until here so that we've had a chance to process 3541 // the -XX:-PrintWarnings flag 3542 if (needs_hotspotrc_warning) { 3543 warning("%s file is present but has been ignored. " 3544 "Run with -XX:Flags=%s to load the file.", 3545 hotspotrc, hotspotrc); 3546 } 3547 3548 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3549 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3550 #endif 3551 3552 #if INCLUDE_ALL_GCS 3553 #if (defined JAVASE_EMBEDDED || defined ARM) 3554 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3555 #endif 3556 #endif 3557 3558 #ifndef PRODUCT 3559 if (TraceBytecodesAt != 0) { 3560 TraceBytecodes = true; 3561 } 3562 if (CountCompiledCalls) { 3563 if (UseCounterDecay) { 3564 warning("UseCounterDecay disabled because CountCalls is set"); 3565 UseCounterDecay = false; 3566 } 3567 } 3568 #endif // PRODUCT 3569 3570 // JSR 292 is not supported before 1.7 3571 if (!JDK_Version::is_gte_jdk17x_version()) { 3572 if (EnableInvokeDynamic) { 3573 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3574 warning("JSR 292 is not supported before 1.7. Disabling support."); 3575 } 3576 EnableInvokeDynamic = false; 3577 } 3578 } 3579 3580 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3581 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3582 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3583 } 3584 ScavengeRootsInCode = 1; 3585 } 3586 3587 if (PrintGCDetails) { 3588 // Turn on -verbose:gc options as well 3589 PrintGC = true; 3590 } 3591 3592 if (!JDK_Version::is_gte_jdk18x_version()) { 3593 // To avoid changing the log format for 7 updates this flag is only 3594 // true by default in JDK8 and above. 3595 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3596 FLAG_SET_DEFAULT(PrintGCCause, false); 3597 } 3598 } 3599 3600 // Set object alignment values. 3601 set_object_alignment(); 3602 3603 #if !INCLUDE_ALL_GCS 3604 force_serial_gc(); 3605 #endif // INCLUDE_ALL_GCS 3606 #if !INCLUDE_CDS 3607 if (DumpSharedSpaces || RequireSharedSpaces) { 3608 jio_fprintf(defaultStream::error_stream(), 3609 "Shared spaces are not supported in this VM\n"); 3610 return JNI_ERR; 3611 } 3612 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3613 warning("Shared spaces are not supported in this VM"); 3614 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3615 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3616 } 3617 no_shared_spaces(); 3618 #endif // INCLUDE_CDS 3619 3620 return JNI_OK; 3621 } 3622 3623 jint Arguments::apply_ergo() { 3624 3625 // Set flags based on ergonomics. 3626 set_ergonomics_flags(); 3627 3628 set_shared_spaces_flags(); 3629 3630 // Check the GC selections again. 3631 if (!check_gc_consistency()) { 3632 return JNI_EINVAL; 3633 } 3634 3635 if (TieredCompilation) { 3636 set_tiered_flags(); 3637 } else { 3638 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3639 if (CompilationPolicyChoice >= 2) { 3640 vm_exit_during_initialization( 3641 "Incompatible compilation policy selected", NULL); 3642 } 3643 } 3644 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 3645 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3646 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 3647 } 3648 3649 3650 // Set heap size based on available physical memory 3651 set_heap_size(); 3652 3653 #if INCLUDE_ALL_GCS 3654 // Set per-collector flags 3655 if (UseParallelGC || UseParallelOldGC) { 3656 set_parallel_gc_flags(); 3657 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3658 set_cms_and_parnew_gc_flags(); 3659 } else if (UseParNewGC) { // skipped if CMS is set above 3660 set_parnew_gc_flags(); 3661 } else if (UseG1GC) { 3662 set_g1_gc_flags(); 3663 } 3664 check_deprecated_gcs(); 3665 check_deprecated_gc_flags(); 3666 if (AssumeMP && !UseSerialGC) { 3667 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3668 warning("If the number of processors is expected to increase from one, then" 3669 " you should configure the number of parallel GC threads appropriately" 3670 " using -XX:ParallelGCThreads=N"); 3671 } 3672 } 3673 #else // INCLUDE_ALL_GCS 3674 assert(verify_serial_gc_flags(), "SerialGC unset"); 3675 #endif // INCLUDE_ALL_GCS 3676 3677 // Initialize Metaspace flags and alignments. 3678 Metaspace::ergo_initialize(); 3679 3680 // Set bytecode rewriting flags 3681 set_bytecode_flags(); 3682 3683 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3684 set_aggressive_opts_flags(); 3685 3686 // Turn off biased locking for locking debug mode flags, 3687 // which are subtlely different from each other but neither works with 3688 // biased locking. 3689 if (UseHeavyMonitors 3690 #ifdef COMPILER1 3691 || !UseFastLocking 3692 #endif // COMPILER1 3693 ) { 3694 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3695 // flag set to true on command line; warn the user that they 3696 // can't enable biased locking here 3697 warning("Biased Locking is not supported with locking debug flags" 3698 "; ignoring UseBiasedLocking flag." ); 3699 } 3700 UseBiasedLocking = false; 3701 } 3702 3703 #ifdef ZERO 3704 // Clear flags not supported on zero. 3705 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3706 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3707 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3708 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3709 #endif // CC_INTERP 3710 3711 #ifdef COMPILER2 3712 if (!UseBiasedLocking || EmitSync != 0) { 3713 UseOptoBiasInlining = false; 3714 } 3715 if (!EliminateLocks) { 3716 EliminateNestedLocks = false; 3717 } 3718 if (!Inline) { 3719 IncrementalInline = false; 3720 } 3721 #ifndef PRODUCT 3722 if (!IncrementalInline) { 3723 AlwaysIncrementalInline = false; 3724 } 3725 #endif 3726 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3727 // incremental inlining: bump MaxNodeLimit 3728 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3729 } 3730 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3731 // nothing to use the profiling, turn if off 3732 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3733 } 3734 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) { 3735 // Doing the replace in parent maps helps speculation 3736 FLAG_SET_DEFAULT(ReplaceInParentMaps, true); 3737 } 3738 #endif 3739 3740 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3741 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3742 DebugNonSafepoints = true; 3743 } 3744 3745 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3746 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3747 } 3748 3749 #ifndef PRODUCT 3750 if (CompileTheWorld) { 3751 // Force NmethodSweeper to sweep whole CodeCache each time. 3752 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3753 NmethodSweepFraction = 1; 3754 } 3755 } 3756 3757 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3758 if (use_vm_log()) { 3759 LogVMOutput = true; 3760 } 3761 } 3762 #endif // PRODUCT 3763 3764 if (PrintCommandLineFlags) { 3765 CommandLineFlags::printSetFlags(tty); 3766 } 3767 3768 // Apply CPU specific policy for the BiasedLocking 3769 if (UseBiasedLocking) { 3770 if (!VM_Version::use_biased_locking() && 3771 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3772 UseBiasedLocking = false; 3773 } 3774 } 3775 3776 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3777 // but only if not already set on the commandline 3778 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3779 bool set = false; 3780 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3781 if (!set) { 3782 FLAG_SET_DEFAULT(PauseAtExit, true); 3783 } 3784 } 3785 3786 return JNI_OK; 3787 } 3788 3789 jint Arguments::adjust_after_os() { 3790 #if INCLUDE_ALL_GCS 3791 if (UseParallelGC || UseParallelOldGC) { 3792 if (UseNUMA) { 3793 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3794 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3795 } 3796 // For those collectors or operating systems (eg, Windows) that do 3797 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 3798 UseNUMAInterleaving = true; 3799 } 3800 } 3801 #endif // INCLUDE_ALL_GCS 3802 return JNI_OK; 3803 } 3804 3805 int Arguments::PropertyList_count(SystemProperty* pl) { 3806 int count = 0; 3807 while(pl != NULL) { 3808 count++; 3809 pl = pl->next(); 3810 } 3811 return count; 3812 } 3813 3814 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3815 assert(key != NULL, "just checking"); 3816 SystemProperty* prop; 3817 for (prop = pl; prop != NULL; prop = prop->next()) { 3818 if (strcmp(key, prop->key()) == 0) return prop->value(); 3819 } 3820 return NULL; 3821 } 3822 3823 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3824 int count = 0; 3825 const char* ret_val = NULL; 3826 3827 while(pl != NULL) { 3828 if(count >= index) { 3829 ret_val = pl->key(); 3830 break; 3831 } 3832 count++; 3833 pl = pl->next(); 3834 } 3835 3836 return ret_val; 3837 } 3838 3839 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3840 int count = 0; 3841 char* ret_val = NULL; 3842 3843 while(pl != NULL) { 3844 if(count >= index) { 3845 ret_val = pl->value(); 3846 break; 3847 } 3848 count++; 3849 pl = pl->next(); 3850 } 3851 3852 return ret_val; 3853 } 3854 3855 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3856 SystemProperty* p = *plist; 3857 if (p == NULL) { 3858 *plist = new_p; 3859 } else { 3860 while (p->next() != NULL) { 3861 p = p->next(); 3862 } 3863 p->set_next(new_p); 3864 } 3865 } 3866 3867 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3868 if (plist == NULL) 3869 return; 3870 3871 SystemProperty* new_p = new SystemProperty(k, v, true); 3872 PropertyList_add(plist, new_p); 3873 } 3874 3875 // This add maintains unique property key in the list. 3876 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3877 if (plist == NULL) 3878 return; 3879 3880 // If property key exist then update with new value. 3881 SystemProperty* prop; 3882 for (prop = *plist; prop != NULL; prop = prop->next()) { 3883 if (strcmp(k, prop->key()) == 0) { 3884 if (append) { 3885 prop->append_value(v); 3886 } else { 3887 prop->set_value(v); 3888 } 3889 return; 3890 } 3891 } 3892 3893 PropertyList_add(plist, k, v); 3894 } 3895 3896 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3897 // Returns true if all of the source pointed by src has been copied over to 3898 // the destination buffer pointed by buf. Otherwise, returns false. 3899 // Notes: 3900 // 1. If the length (buflen) of the destination buffer excluding the 3901 // NULL terminator character is not long enough for holding the expanded 3902 // pid characters, it also returns false instead of returning the partially 3903 // expanded one. 3904 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3905 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3906 char* buf, size_t buflen) { 3907 const char* p = src; 3908 char* b = buf; 3909 const char* src_end = &src[srclen]; 3910 char* buf_end = &buf[buflen - 1]; 3911 3912 while (p < src_end && b < buf_end) { 3913 if (*p == '%') { 3914 switch (*(++p)) { 3915 case '%': // "%%" ==> "%" 3916 *b++ = *p++; 3917 break; 3918 case 'p': { // "%p" ==> current process id 3919 // buf_end points to the character before the last character so 3920 // that we could write '\0' to the end of the buffer. 3921 size_t buf_sz = buf_end - b + 1; 3922 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3923 3924 // if jio_snprintf fails or the buffer is not long enough to hold 3925 // the expanded pid, returns false. 3926 if (ret < 0 || ret >= (int)buf_sz) { 3927 return false; 3928 } else { 3929 b += ret; 3930 assert(*b == '\0', "fail in copy_expand_pid"); 3931 if (p == src_end && b == buf_end + 1) { 3932 // reach the end of the buffer. 3933 return true; 3934 } 3935 } 3936 p++; 3937 break; 3938 } 3939 default : 3940 *b++ = '%'; 3941 } 3942 } else { 3943 *b++ = *p++; 3944 } 3945 } 3946 *b = '\0'; 3947 return (p == src_end); // return false if not all of the source was copied 3948 }