1 /* 2 * Copyright (c) 1997, 2014, 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::_sun_java_launcher_is_altjvm = 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, sun.java.launcher.is_altjvm or 158 // sun.java.launcher.pid is defined. 159 // Must do this before setting up other system properties, 160 // as some of them may depend on launcher type. 161 for (int index = 0; index < args->nOptions; index++) { 162 const JavaVMOption* option = args->options + index; 163 const char* tail; 164 165 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 166 process_java_launcher_argument(tail, option->extraInfo); 167 continue; 168 } 169 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 170 if (strcmp(tail, "true") == 0) { 171 _sun_java_launcher_is_altjvm = true; 172 } 173 continue; 174 } 175 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 176 _sun_java_launcher_pid = atoi(tail); 177 continue; 178 } 179 } 180 } 181 182 // Initialize system properties key and value. 183 void Arguments::init_system_properties() { 184 185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 186 "Java Virtual Machine Specification", false)); 187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 190 191 // Following are JVMTI agent writable properties. 192 // Properties values are set to NULL and they are 193 // os specific they are initialized in os::init_system_properties_values(). 194 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 195 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 196 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 197 _java_library_path = new SystemProperty("java.library.path", NULL, true); 198 _java_home = new SystemProperty("java.home", NULL, true); 199 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 200 201 _java_class_path = new SystemProperty("java.class.path", "", true); 202 203 // Add to System Property list. 204 PropertyList_add(&_system_properties, _java_ext_dirs); 205 PropertyList_add(&_system_properties, _java_endorsed_dirs); 206 PropertyList_add(&_system_properties, _sun_boot_library_path); 207 PropertyList_add(&_system_properties, _java_library_path); 208 PropertyList_add(&_system_properties, _java_home); 209 PropertyList_add(&_system_properties, _java_class_path); 210 PropertyList_add(&_system_properties, _sun_boot_class_path); 211 212 // Set OS specific system properties values 213 os::init_system_properties_values(); 214 } 215 216 217 // Update/Initialize System properties after JDK version number is known 218 void Arguments::init_version_specific_system_properties() { 219 enum { bufsz = 16 }; 220 char buffer[bufsz]; 221 const char* spec_vendor = "Sun Microsystems Inc."; 222 uint32_t spec_version = 0; 223 224 if (JDK_Version::is_gte_jdk17x_version()) { 225 spec_vendor = "Oracle Corporation"; 226 spec_version = JDK_Version::current().major_version(); 227 } 228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 229 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.specification.version", buffer, false)); 234 PropertyList_add(&_system_properties, 235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 236 } 237 238 /** 239 * Provide a slightly more user-friendly way of eliminating -XX flags. 240 * When a flag is eliminated, it can be added to this list in order to 241 * continue accepting this flag on the command-line, while issuing a warning 242 * and ignoring the value. Once the JDK version reaches the 'accept_until' 243 * limit, we flatly refuse to admit the existence of the flag. This allows 244 * a flag to die correctly over JDK releases using HSX. 245 */ 246 typedef struct { 247 const char* name; 248 JDK_Version obsoleted_in; // when the flag went away 249 JDK_Version accept_until; // which version to start denying the existence 250 } ObsoleteFlag; 251 252 static ObsoleteFlag obsolete_jvm_flags[] = { 253 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 260 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 261 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 262 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 263 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 264 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 265 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 266 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 267 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 268 { "DefaultInitialRAMFraction", 269 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 270 { "UseDepthFirstScavengeOrder", 271 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 272 { "HandlePromotionFailure", 273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 274 { "MaxLiveObjectEvacuationRatio", 275 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 276 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 277 { "UseParallelOldGCCompacting", 278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 279 { "UseParallelDensePrefixUpdate", 280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 281 { "UseParallelOldGCDensePrefix", 282 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 283 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 284 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 285 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 297 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 302 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 303 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 304 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 305 #ifdef PRODUCT 306 { "DesiredMethodLimit", 307 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 308 #endif // PRODUCT 309 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 310 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 311 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 312 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 313 { NULL, JDK_Version(0), JDK_Version(0) } 314 }; 315 316 // Returns true if the flag is obsolete and fits into the range specified 317 // for being ignored. In the case that the flag is ignored, the 'version' 318 // value is filled in with the version number when the flag became 319 // obsolete so that that value can be displayed to the user. 320 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 321 int i = 0; 322 assert(version != NULL, "Must provide a version buffer"); 323 while (obsolete_jvm_flags[i].name != NULL) { 324 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 325 // <flag>=xxx form 326 // [-|+]<flag> form 327 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 328 ((s[0] == '+' || s[0] == '-') && 329 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 330 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 331 *version = flag_status.obsoleted_in; 332 return true; 333 } 334 } 335 i++; 336 } 337 return false; 338 } 339 340 // Constructs the system class path (aka boot class path) from the following 341 // components, in order: 342 // 343 // prefix // from -Xbootclasspath/p:... 344 // endorsed // the expansion of -Djava.endorsed.dirs=... 345 // base // from os::get_system_properties() or -Xbootclasspath= 346 // suffix // from -Xbootclasspath/a:... 347 // 348 // java.endorsed.dirs is a list of directories; any jar or zip files in the 349 // directories are added to the sysclasspath just before the base. 350 // 351 // This could be AllStatic, but it isn't needed after argument processing is 352 // complete. 353 class SysClassPath: public StackObj { 354 public: 355 SysClassPath(const char* base); 356 ~SysClassPath(); 357 358 inline void set_base(const char* base); 359 inline void add_prefix(const char* prefix); 360 inline void add_suffix_to_prefix(const char* suffix); 361 inline void add_suffix(const char* suffix); 362 inline void reset_path(const char* base); 363 364 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 365 // property. Must be called after all command-line arguments have been 366 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 367 // combined_path(). 368 void expand_endorsed(); 369 370 inline const char* get_base() const { return _items[_scp_base]; } 371 inline const char* get_prefix() const { return _items[_scp_prefix]; } 372 inline const char* get_suffix() const { return _items[_scp_suffix]; } 373 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 374 375 // Combine all the components into a single c-heap-allocated string; caller 376 // must free the string if/when no longer needed. 377 char* combined_path(); 378 379 private: 380 // Utility routines. 381 static char* add_to_path(const char* path, const char* str, bool prepend); 382 static char* add_jars_to_path(char* path, const char* directory); 383 384 inline void reset_item_at(int index); 385 386 // Array indices for the items that make up the sysclasspath. All except the 387 // base are allocated in the C heap and freed by this class. 388 enum { 389 _scp_prefix, // from -Xbootclasspath/p:... 390 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 391 _scp_base, // the default sysclasspath 392 _scp_suffix, // from -Xbootclasspath/a:... 393 _scp_nitems // the number of items, must be last. 394 }; 395 396 const char* _items[_scp_nitems]; 397 DEBUG_ONLY(bool _expansion_done;) 398 }; 399 400 SysClassPath::SysClassPath(const char* base) { 401 memset(_items, 0, sizeof(_items)); 402 _items[_scp_base] = base; 403 DEBUG_ONLY(_expansion_done = false;) 404 } 405 406 SysClassPath::~SysClassPath() { 407 // Free everything except the base. 408 for (int i = 0; i < _scp_nitems; ++i) { 409 if (i != _scp_base) reset_item_at(i); 410 } 411 DEBUG_ONLY(_expansion_done = false;) 412 } 413 414 inline void SysClassPath::set_base(const char* base) { 415 _items[_scp_base] = base; 416 } 417 418 inline void SysClassPath::add_prefix(const char* prefix) { 419 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 420 } 421 422 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 423 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 424 } 425 426 inline void SysClassPath::add_suffix(const char* suffix) { 427 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 428 } 429 430 inline void SysClassPath::reset_item_at(int index) { 431 assert(index < _scp_nitems && index != _scp_base, "just checking"); 432 if (_items[index] != NULL) { 433 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 434 _items[index] = NULL; 435 } 436 } 437 438 inline void SysClassPath::reset_path(const char* base) { 439 // Clear the prefix and suffix. 440 reset_item_at(_scp_prefix); 441 reset_item_at(_scp_suffix); 442 set_base(base); 443 } 444 445 //------------------------------------------------------------------------------ 446 447 void SysClassPath::expand_endorsed() { 448 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 449 450 const char* path = Arguments::get_property("java.endorsed.dirs"); 451 if (path == NULL) { 452 path = Arguments::get_endorsed_dir(); 453 assert(path != NULL, "no default for java.endorsed.dirs"); 454 } 455 456 char* expanded_path = NULL; 457 const char separator = *os::path_separator(); 458 const char* const end = path + strlen(path); 459 while (path < end) { 460 const char* tmp_end = strchr(path, separator); 461 if (tmp_end == NULL) { 462 expanded_path = add_jars_to_path(expanded_path, path); 463 path = end; 464 } else { 465 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 466 memcpy(dirpath, path, tmp_end - path); 467 dirpath[tmp_end - path] = '\0'; 468 expanded_path = add_jars_to_path(expanded_path, dirpath); 469 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 470 path = tmp_end + 1; 471 } 472 } 473 _items[_scp_endorsed] = expanded_path; 474 DEBUG_ONLY(_expansion_done = true;) 475 } 476 477 // Combine the bootclasspath elements, some of which may be null, into a single 478 // c-heap-allocated string. 479 char* SysClassPath::combined_path() { 480 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 481 assert(_expansion_done, "must call expand_endorsed() first."); 482 483 size_t lengths[_scp_nitems]; 484 size_t total_len = 0; 485 486 const char separator = *os::path_separator(); 487 488 // Get the lengths. 489 int i; 490 for (i = 0; i < _scp_nitems; ++i) { 491 if (_items[i] != NULL) { 492 lengths[i] = strlen(_items[i]); 493 // Include space for the separator char (or a NULL for the last item). 494 total_len += lengths[i] + 1; 495 } 496 } 497 assert(total_len > 0, "empty sysclasspath not allowed"); 498 499 // Copy the _items to a single string. 500 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 501 char* cp_tmp = cp; 502 for (i = 0; i < _scp_nitems; ++i) { 503 if (_items[i] != NULL) { 504 memcpy(cp_tmp, _items[i], lengths[i]); 505 cp_tmp += lengths[i]; 506 *cp_tmp++ = separator; 507 } 508 } 509 *--cp_tmp = '\0'; // Replace the extra separator. 510 return cp; 511 } 512 513 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 514 char* 515 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 516 char *cp; 517 518 assert(str != NULL, "just checking"); 519 if (path == NULL) { 520 size_t len = strlen(str) + 1; 521 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 522 memcpy(cp, str, len); // copy the trailing null 523 } else { 524 const char separator = *os::path_separator(); 525 size_t old_len = strlen(path); 526 size_t str_len = strlen(str); 527 size_t len = old_len + str_len + 2; 528 529 if (prepend) { 530 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 531 char* cp_tmp = cp; 532 memcpy(cp_tmp, str, str_len); 533 cp_tmp += str_len; 534 *cp_tmp = separator; 535 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 536 FREE_C_HEAP_ARRAY(char, path, mtInternal); 537 } else { 538 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 539 char* cp_tmp = cp + old_len; 540 *cp_tmp = separator; 541 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 542 } 543 } 544 return cp; 545 } 546 547 // Scan the directory and append any jar or zip files found to path. 548 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 549 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 550 DIR* dir = os::opendir(directory); 551 if (dir == NULL) return path; 552 553 char dir_sep[2] = { '\0', '\0' }; 554 size_t directory_len = strlen(directory); 555 const char fileSep = *os::file_separator(); 556 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 557 558 /* Scan the directory for jars/zips, appending them to path. */ 559 struct dirent *entry; 560 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 561 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 562 const char* name = entry->d_name; 563 const char* ext = name + strlen(name) - 4; 564 bool isJarOrZip = ext > name && 565 (os::file_name_strcmp(ext, ".jar") == 0 || 566 os::file_name_strcmp(ext, ".zip") == 0); 567 if (isJarOrZip) { 568 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 569 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 570 path = add_to_path(path, jarpath, false); 571 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 572 } 573 } 574 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 575 os::closedir(dir); 576 return path; 577 } 578 579 // Parses a memory size specification string. 580 static bool atomull(const char *s, julong* result) { 581 julong n = 0; 582 int args_read = sscanf(s, JULONG_FORMAT, &n); 583 if (args_read != 1) { 584 return false; 585 } 586 while (*s != '\0' && isdigit(*s)) { 587 s++; 588 } 589 // 4705540: illegal if more characters are found after the first non-digit 590 if (strlen(s) > 1) { 591 return false; 592 } 593 switch (*s) { 594 case 'T': case 't': 595 *result = n * G * K; 596 // Check for overflow. 597 if (*result/((julong)G * K) != n) return false; 598 return true; 599 case 'G': case 'g': 600 *result = n * G; 601 if (*result/G != n) return false; 602 return true; 603 case 'M': case 'm': 604 *result = n * M; 605 if (*result/M != n) return false; 606 return true; 607 case 'K': case 'k': 608 *result = n * K; 609 if (*result/K != n) return false; 610 return true; 611 case '\0': 612 *result = n; 613 return true; 614 default: 615 return false; 616 } 617 } 618 619 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 620 if (size < min_size) return arg_too_small; 621 // Check that size will fit in a size_t (only relevant on 32-bit) 622 if (size > max_uintx) return arg_too_big; 623 return arg_in_range; 624 } 625 626 // Describe an argument out of range error 627 void Arguments::describe_range_error(ArgsRange errcode) { 628 switch(errcode) { 629 case arg_too_big: 630 jio_fprintf(defaultStream::error_stream(), 631 "The specified size exceeds the maximum " 632 "representable size.\n"); 633 break; 634 case arg_too_small: 635 case arg_unreadable: 636 case arg_in_range: 637 // do nothing for now 638 break; 639 default: 640 ShouldNotReachHere(); 641 } 642 } 643 644 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 645 return CommandLineFlags::boolAtPut(name, &value, origin); 646 } 647 648 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 649 double v; 650 if (sscanf(value, "%lf", &v) != 1) { 651 return false; 652 } 653 654 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 655 return true; 656 } 657 return false; 658 } 659 660 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 661 julong v; 662 intx intx_v; 663 bool is_neg = false; 664 // Check the sign first since atomull() parses only unsigned values. 665 if (*value == '-') { 666 if (!CommandLineFlags::intxAt(name, &intx_v)) { 667 return false; 668 } 669 value++; 670 is_neg = true; 671 } 672 if (!atomull(value, &v)) { 673 return false; 674 } 675 intx_v = (intx) v; 676 if (is_neg) { 677 intx_v = -intx_v; 678 } 679 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 680 return true; 681 } 682 uintx uintx_v = (uintx) v; 683 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 684 return true; 685 } 686 uint64_t uint64_t_v = (uint64_t) v; 687 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 688 return true; 689 } 690 return false; 691 } 692 693 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 694 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 695 // Contract: CommandLineFlags always returns a pointer that needs freeing. 696 FREE_C_HEAP_ARRAY(char, value, mtInternal); 697 return true; 698 } 699 700 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 701 const char* old_value = ""; 702 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 703 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 704 size_t new_len = strlen(new_value); 705 const char* value; 706 char* free_this_too = NULL; 707 if (old_len == 0) { 708 value = new_value; 709 } else if (new_len == 0) { 710 value = old_value; 711 } else { 712 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 713 // each new setting adds another LINE to the switch: 714 sprintf(buf, "%s\n%s", old_value, new_value); 715 value = buf; 716 free_this_too = buf; 717 } 718 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 719 // CommandLineFlags always returns a pointer that needs freeing. 720 FREE_C_HEAP_ARRAY(char, value, mtInternal); 721 if (free_this_too != NULL) { 722 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 723 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 724 } 725 return true; 726 } 727 728 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 729 730 // range of acceptable characters spelled out for portability reasons 731 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 732 #define BUFLEN 255 733 char name[BUFLEN+1]; 734 char dummy; 735 736 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 737 return set_bool_flag(name, false, origin); 738 } 739 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 740 return set_bool_flag(name, true, origin); 741 } 742 743 char punct; 744 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 745 const char* value = strchr(arg, '=') + 1; 746 Flag* flag = Flag::find_flag(name, strlen(name)); 747 if (flag != NULL && flag->is_ccstr()) { 748 if (flag->ccstr_accumulates()) { 749 return append_to_string_flag(name, value, origin); 750 } else { 751 if (value[0] == '\0') { 752 value = NULL; 753 } 754 return set_string_flag(name, value, origin); 755 } 756 } 757 } 758 759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 760 const char* value = strchr(arg, '=') + 1; 761 // -XX:Foo:=xxx will reset the string flag to the given value. 762 if (value[0] == '\0') { 763 value = NULL; 764 } 765 return set_string_flag(name, value, origin); 766 } 767 768 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 769 #define SIGNED_NUMBER_RANGE "[-0123456789]" 770 #define NUMBER_RANGE "[0123456789]" 771 char value[BUFLEN + 1]; 772 char value2[BUFLEN + 1]; 773 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 774 // Looks like a floating-point number -- try again with more lenient format string 775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 776 return set_fp_numeric_flag(name, value, origin); 777 } 778 } 779 780 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 781 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 782 return set_numeric_flag(name, value, origin); 783 } 784 785 return false; 786 } 787 788 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 789 assert(bldarray != NULL, "illegal argument"); 790 791 if (arg == NULL) { 792 return; 793 } 794 795 int new_count = *count + 1; 796 797 // expand the array and add arg to the last element 798 if (*bldarray == NULL) { 799 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 800 } else { 801 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 802 } 803 (*bldarray)[*count] = strdup(arg); 804 *count = new_count; 805 } 806 807 void Arguments::build_jvm_args(const char* arg) { 808 add_string(&_jvm_args_array, &_num_jvm_args, arg); 809 } 810 811 void Arguments::build_jvm_flags(const char* arg) { 812 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 813 } 814 815 // utility function to return a string that concatenates all 816 // strings in a given char** array 817 const char* Arguments::build_resource_string(char** args, int count) { 818 if (args == NULL || count == 0) { 819 return NULL; 820 } 821 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 822 for (int i = 1; i < count; i++) { 823 length += strlen(args[i]) + 1; // add 1 for a space 824 } 825 char* s = NEW_RESOURCE_ARRAY(char, length); 826 strcpy(s, args[0]); 827 for (int j = 1; j < count; j++) { 828 strcat(s, " "); 829 strcat(s, args[j]); 830 } 831 return (const char*) s; 832 } 833 834 void Arguments::print_on(outputStream* st) { 835 st->print_cr("VM Arguments:"); 836 if (num_jvm_flags() > 0) { 837 st->print("jvm_flags: "); print_jvm_flags_on(st); 838 } 839 if (num_jvm_args() > 0) { 840 st->print("jvm_args: "); print_jvm_args_on(st); 841 } 842 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 843 if (_java_class_path != NULL) { 844 char* path = _java_class_path->value(); 845 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 846 } 847 st->print_cr("Launcher Type: %s", _sun_java_launcher); 848 } 849 850 void Arguments::print_jvm_flags_on(outputStream* st) { 851 if (_num_jvm_flags > 0) { 852 for (int i=0; i < _num_jvm_flags; i++) { 853 st->print("%s ", _jvm_flags_array[i]); 854 } 855 st->print_cr(""); 856 } 857 } 858 859 void Arguments::print_jvm_args_on(outputStream* st) { 860 if (_num_jvm_args > 0) { 861 for (int i=0; i < _num_jvm_args; i++) { 862 st->print("%s ", _jvm_args_array[i]); 863 } 864 st->print_cr(""); 865 } 866 } 867 868 bool Arguments::process_argument(const char* arg, 869 jboolean ignore_unrecognized, Flag::Flags origin) { 870 871 JDK_Version since = JDK_Version(); 872 873 if (parse_argument(arg, origin) || ignore_unrecognized) { 874 return true; 875 } 876 877 bool has_plus_minus = (*arg == '+' || *arg == '-'); 878 const char* const argname = has_plus_minus ? arg + 1 : arg; 879 if (is_newly_obsolete(arg, &since)) { 880 char version[256]; 881 since.to_string(version, sizeof(version)); 882 warning("ignoring option %s; support was removed in %s", argname, version); 883 return true; 884 } 885 886 // For locked flags, report a custom error message if available. 887 // Otherwise, report the standard unrecognized VM option. 888 889 size_t arg_len; 890 const char* equal_sign = strchr(argname, '='); 891 if (equal_sign == NULL) { 892 arg_len = strlen(argname); 893 } else { 894 arg_len = equal_sign - argname; 895 } 896 897 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 898 if (found_flag != NULL) { 899 char locked_message_buf[BUFLEN]; 900 found_flag->get_locked_message(locked_message_buf, BUFLEN); 901 if (strlen(locked_message_buf) == 0) { 902 if (found_flag->is_bool() && !has_plus_minus) { 903 jio_fprintf(defaultStream::error_stream(), 904 "Missing +/- setting for VM option '%s'\n", argname); 905 } else if (!found_flag->is_bool() && has_plus_minus) { 906 jio_fprintf(defaultStream::error_stream(), 907 "Unexpected +/- setting in VM option '%s'\n", argname); 908 } else { 909 jio_fprintf(defaultStream::error_stream(), 910 "Improperly specified VM option '%s'\n", argname); 911 } 912 } else { 913 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 914 } 915 } else { 916 jio_fprintf(defaultStream::error_stream(), 917 "Unrecognized VM option '%s'\n", argname); 918 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 919 if (fuzzy_matched != NULL) { 920 jio_fprintf(defaultStream::error_stream(), 921 "Did you mean '%s%s%s'?\n", 922 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 923 fuzzy_matched->_name, 924 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 925 } 926 } 927 928 // allow for commandline "commenting out" options like -XX:#+Verbose 929 return arg[0] == '#'; 930 } 931 932 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 933 FILE* stream = fopen(file_name, "rb"); 934 if (stream == NULL) { 935 if (should_exist) { 936 jio_fprintf(defaultStream::error_stream(), 937 "Could not open settings file %s\n", file_name); 938 return false; 939 } else { 940 return true; 941 } 942 } 943 944 char token[1024]; 945 int pos = 0; 946 947 bool in_white_space = true; 948 bool in_comment = false; 949 bool in_quote = false; 950 char quote_c = 0; 951 bool result = true; 952 953 int c = getc(stream); 954 while(c != EOF && pos < (int)(sizeof(token)-1)) { 955 if (in_white_space) { 956 if (in_comment) { 957 if (c == '\n') in_comment = false; 958 } else { 959 if (c == '#') in_comment = true; 960 else if (!isspace(c)) { 961 in_white_space = false; 962 token[pos++] = c; 963 } 964 } 965 } else { 966 if (c == '\n' || (!in_quote && isspace(c))) { 967 // token ends at newline, or at unquoted whitespace 968 // this allows a way to include spaces in string-valued options 969 token[pos] = '\0'; 970 logOption(token); 971 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 972 build_jvm_flags(token); 973 pos = 0; 974 in_white_space = true; 975 in_quote = false; 976 } else if (!in_quote && (c == '\'' || c == '"')) { 977 in_quote = true; 978 quote_c = c; 979 } else if (in_quote && (c == quote_c)) { 980 in_quote = false; 981 } else { 982 token[pos++] = c; 983 } 984 } 985 c = getc(stream); 986 } 987 if (pos > 0) { 988 token[pos] = '\0'; 989 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 990 build_jvm_flags(token); 991 } 992 fclose(stream); 993 return result; 994 } 995 996 //============================================================================================================= 997 // Parsing of properties (-D) 998 999 const char* Arguments::get_property(const char* key) { 1000 return PropertyList_get_value(system_properties(), key); 1001 } 1002 1003 bool Arguments::add_property(const char* prop) { 1004 const char* eq = strchr(prop, '='); 1005 char* key; 1006 // ns must be static--its address may be stored in a SystemProperty object. 1007 const static char ns[1] = {0}; 1008 char* value = (char *)ns; 1009 1010 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1011 key = AllocateHeap(key_len + 1, mtInternal); 1012 strncpy(key, prop, key_len); 1013 key[key_len] = '\0'; 1014 1015 if (eq != NULL) { 1016 size_t value_len = strlen(prop) - key_len - 1; 1017 value = AllocateHeap(value_len + 1, mtInternal); 1018 strncpy(value, &prop[key_len + 1], value_len + 1); 1019 } 1020 1021 if (strcmp(key, "java.compiler") == 0) { 1022 process_java_compiler_argument(value); 1023 FreeHeap(key); 1024 if (eq != NULL) { 1025 FreeHeap(value); 1026 } 1027 return true; 1028 } else if (strcmp(key, "sun.java.command") == 0) { 1029 _java_command = value; 1030 1031 // Record value in Arguments, but let it get passed to Java. 1032 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1033 strcmp(key, "sun.java.launcher.pid") == 0) { 1034 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1035 // private and are processed in process_sun_java_launcher_properties(); 1036 // the sun.java.launcher property is passed on to the java application 1037 FreeHeap(key); 1038 if (eq != NULL) { 1039 FreeHeap(value); 1040 } 1041 return true; 1042 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1043 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1044 // its value without going through the property list or making a Java call. 1045 _java_vendor_url_bug = value; 1046 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1047 PropertyList_unique_add(&_system_properties, key, value, true); 1048 return true; 1049 } 1050 // Create new property and add at the end of the list 1051 PropertyList_unique_add(&_system_properties, key, value); 1052 return true; 1053 } 1054 1055 //=========================================================================================================== 1056 // Setting int/mixed/comp mode flags 1057 1058 void Arguments::set_mode_flags(Mode mode) { 1059 // Set up default values for all flags. 1060 // If you add a flag to any of the branches below, 1061 // add a default value for it here. 1062 set_java_compiler(false); 1063 _mode = mode; 1064 1065 // Ensure Agent_OnLoad has the correct initial values. 1066 // This may not be the final mode; mode may change later in onload phase. 1067 PropertyList_unique_add(&_system_properties, "java.vm.info", 1068 (char*)VM_Version::vm_info_string(), false); 1069 1070 UseInterpreter = true; 1071 UseCompiler = true; 1072 UseLoopCounter = true; 1073 1074 #ifndef ZERO 1075 // Turn these off for mixed and comp. Leave them on for Zero. 1076 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1077 UseFastAccessorMethods = (mode == _int); 1078 } 1079 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1080 UseFastEmptyMethods = (mode == _int); 1081 } 1082 #endif 1083 1084 // Default values may be platform/compiler dependent - 1085 // use the saved values 1086 ClipInlining = Arguments::_ClipInlining; 1087 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1088 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1089 BackgroundCompilation = Arguments::_BackgroundCompilation; 1090 1091 // Change from defaults based on mode 1092 switch (mode) { 1093 default: 1094 ShouldNotReachHere(); 1095 break; 1096 case _int: 1097 UseCompiler = false; 1098 UseLoopCounter = false; 1099 AlwaysCompileLoopMethods = false; 1100 UseOnStackReplacement = false; 1101 break; 1102 case _mixed: 1103 // same as default 1104 break; 1105 case _comp: 1106 UseInterpreter = false; 1107 BackgroundCompilation = false; 1108 ClipInlining = false; 1109 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1110 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1111 // compile a level 4 (C2) and then continue executing it. 1112 if (TieredCompilation) { 1113 Tier3InvokeNotifyFreqLog = 0; 1114 Tier4InvocationThreshold = 0; 1115 } 1116 break; 1117 } 1118 } 1119 1120 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1121 // Conflict: required to use shared spaces (-Xshare:on), but 1122 // incompatible command line options were chosen. 1123 1124 static void no_shared_spaces() { 1125 if (RequireSharedSpaces) { 1126 jio_fprintf(defaultStream::error_stream(), 1127 "Class data sharing is inconsistent with other specified options.\n"); 1128 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1129 } else { 1130 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1131 } 1132 } 1133 #endif 1134 1135 void Arguments::set_tiered_flags() { 1136 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1137 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1138 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1139 } 1140 if (CompilationPolicyChoice < 2) { 1141 vm_exit_during_initialization( 1142 "Incompatible compilation policy selected", NULL); 1143 } 1144 // Increase the code cache size - tiered compiles a lot more. 1145 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1146 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1147 } 1148 if (!UseInterpreter) { // -Xcomp 1149 Tier3InvokeNotifyFreqLog = 0; 1150 Tier4InvocationThreshold = 0; 1151 } 1152 } 1153 1154 #if INCLUDE_ALL_GCS 1155 static void disable_adaptive_size_policy(const char* collector_name) { 1156 if (UseAdaptiveSizePolicy) { 1157 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1158 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1159 collector_name); 1160 } 1161 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1162 } 1163 } 1164 1165 void Arguments::set_parnew_gc_flags() { 1166 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1167 "control point invariant"); 1168 assert(UseParNewGC, "Error"); 1169 1170 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1171 disable_adaptive_size_policy("UseParNewGC"); 1172 1173 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1174 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1175 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1176 } else if (ParallelGCThreads == 0) { 1177 jio_fprintf(defaultStream::error_stream(), 1178 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1179 vm_exit(1); 1180 } 1181 1182 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1183 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1184 // we set them to 1024 and 1024. 1185 // See CR 6362902. 1186 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1187 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1188 } 1189 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1190 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1191 } 1192 1193 // When using compressed oops, we use local overflow stacks, 1194 // rather than using a global overflow list chained through 1195 // the klass word of the object's pre-image. 1196 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1197 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1198 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1199 } 1200 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1201 } 1202 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1203 } 1204 1205 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1206 // sparc/solaris for certain applications, but would gain from 1207 // further optimization and tuning efforts, and would almost 1208 // certainly gain from analysis of platform and environment. 1209 void Arguments::set_cms_and_parnew_gc_flags() { 1210 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1211 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1212 1213 // If we are using CMS, we prefer to UseParNewGC, 1214 // unless explicitly forbidden. 1215 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1216 FLAG_SET_ERGO(bool, UseParNewGC, true); 1217 } 1218 1219 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1220 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1221 1222 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1223 // as needed. 1224 if (UseParNewGC) { 1225 set_parnew_gc_flags(); 1226 } 1227 1228 size_t max_heap = align_size_down(MaxHeapSize, 1229 CardTableRS::ct_max_alignment_constraint()); 1230 1231 // Now make adjustments for CMS 1232 intx tenuring_default = (intx)6; 1233 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1234 1235 // Preferred young gen size for "short" pauses: 1236 // upper bound depends on # of threads and NewRatio. 1237 const uintx parallel_gc_threads = 1238 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1239 const size_t preferred_max_new_size_unaligned = 1240 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1241 size_t preferred_max_new_size = 1242 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1243 1244 // Unless explicitly requested otherwise, size young gen 1245 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1246 1247 // If either MaxNewSize or NewRatio is set on the command line, 1248 // assume the user is trying to set the size of the young gen. 1249 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1250 1251 // Set MaxNewSize to our calculated preferred_max_new_size unless 1252 // NewSize was set on the command line and it is larger than 1253 // preferred_max_new_size. 1254 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1255 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1256 } else { 1257 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1258 } 1259 if (PrintGCDetails && Verbose) { 1260 // Too early to use gclog_or_tty 1261 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1262 } 1263 1264 // Code along this path potentially sets NewSize and OldSize 1265 if (PrintGCDetails && Verbose) { 1266 // Too early to use gclog_or_tty 1267 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1268 " initial_heap_size: " SIZE_FORMAT 1269 " max_heap: " SIZE_FORMAT, 1270 min_heap_size(), InitialHeapSize, max_heap); 1271 } 1272 size_t min_new = preferred_max_new_size; 1273 if (FLAG_IS_CMDLINE(NewSize)) { 1274 min_new = NewSize; 1275 } 1276 if (max_heap > min_new && min_heap_size() > min_new) { 1277 // Unless explicitly requested otherwise, make young gen 1278 // at least min_new, and at most preferred_max_new_size. 1279 if (FLAG_IS_DEFAULT(NewSize)) { 1280 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1281 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1282 if (PrintGCDetails && Verbose) { 1283 // Too early to use gclog_or_tty 1284 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1285 } 1286 } 1287 // Unless explicitly requested otherwise, size old gen 1288 // so it's NewRatio x of NewSize. 1289 if (FLAG_IS_DEFAULT(OldSize)) { 1290 if (max_heap > NewSize) { 1291 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1292 if (PrintGCDetails && Verbose) { 1293 // Too early to use gclog_or_tty 1294 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1295 } 1296 } 1297 } 1298 } 1299 } 1300 // Unless explicitly requested otherwise, definitely 1301 // promote all objects surviving "tenuring_default" scavenges. 1302 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1303 FLAG_IS_DEFAULT(SurvivorRatio)) { 1304 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1305 } 1306 // If we decided above (or user explicitly requested) 1307 // `promote all' (via MaxTenuringThreshold := 0), 1308 // prefer minuscule survivor spaces so as not to waste 1309 // space for (non-existent) survivors 1310 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1311 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1312 } 1313 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1314 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1315 // This is done in order to make ParNew+CMS configuration to work 1316 // with YoungPLABSize and OldPLABSize options. 1317 // See CR 6362902. 1318 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1319 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1320 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1321 // is. In this situation let CMSParPromoteBlocksToClaim follow 1322 // the value (either from the command line or ergonomics) of 1323 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1324 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1325 } else { 1326 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1327 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1328 // we'll let it to take precedence. 1329 jio_fprintf(defaultStream::error_stream(), 1330 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1331 " options are specified for the CMS collector." 1332 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1333 } 1334 } 1335 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1336 // OldPLAB sizing manually turned off: Use a larger default setting, 1337 // unless it was manually specified. This is because a too-low value 1338 // will slow down scavenges. 1339 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1340 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1341 } 1342 } 1343 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1344 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1345 // If either of the static initialization defaults have changed, note this 1346 // modification. 1347 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1348 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1349 } 1350 if (PrintGCDetails && Verbose) { 1351 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1352 MarkStackSize / K, MarkStackSizeMax / K); 1353 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1354 } 1355 } 1356 #endif // INCLUDE_ALL_GCS 1357 1358 void set_object_alignment() { 1359 // Object alignment. 1360 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1361 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1362 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1363 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1364 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1365 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1366 1367 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1368 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1369 1370 // Oop encoding heap max 1371 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1372 1373 #if INCLUDE_ALL_GCS 1374 // Set CMS global values 1375 CompactibleFreeListSpace::set_cms_values(); 1376 #endif // INCLUDE_ALL_GCS 1377 } 1378 1379 bool verify_object_alignment() { 1380 // Object alignment. 1381 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1382 jio_fprintf(defaultStream::error_stream(), 1383 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1384 (int)ObjectAlignmentInBytes); 1385 return false; 1386 } 1387 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1388 jio_fprintf(defaultStream::error_stream(), 1389 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1390 (int)ObjectAlignmentInBytes, BytesPerLong); 1391 return false; 1392 } 1393 // It does not make sense to have big object alignment 1394 // since a space lost due to alignment will be greater 1395 // then a saved space from compressed oops. 1396 if ((int)ObjectAlignmentInBytes > 256) { 1397 jio_fprintf(defaultStream::error_stream(), 1398 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1399 (int)ObjectAlignmentInBytes); 1400 return false; 1401 } 1402 // In case page size is very small. 1403 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1404 jio_fprintf(defaultStream::error_stream(), 1405 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1406 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1407 return false; 1408 } 1409 return true; 1410 } 1411 1412 uintx Arguments::max_heap_for_compressed_oops() { 1413 // Avoid sign flip. 1414 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1415 // We need to fit both the NULL page and the heap into the memory budget, while 1416 // keeping alignment constraints of the heap. To guarantee the latter, as the 1417 // NULL page is located before the heap, we pad the NULL page to the conservative 1418 // maximum alignment that the GC may ever impose upon the heap. 1419 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1420 _conservative_max_heap_alignment); 1421 1422 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1423 NOT_LP64(ShouldNotReachHere(); return 0); 1424 } 1425 1426 bool Arguments::should_auto_select_low_pause_collector() { 1427 if (UseAutoGCSelectPolicy && 1428 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1429 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1430 if (PrintGCDetails) { 1431 // Cannot use gclog_or_tty yet. 1432 tty->print_cr("Automatic selection of the low pause collector" 1433 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1434 } 1435 return true; 1436 } 1437 return false; 1438 } 1439 1440 void Arguments::set_use_compressed_oops() { 1441 #ifndef ZERO 1442 #ifdef _LP64 1443 // MaxHeapSize is not set up properly at this point, but 1444 // the only value that can override MaxHeapSize if we are 1445 // to use UseCompressedOops is InitialHeapSize. 1446 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1447 1448 if (max_heap_size <= max_heap_for_compressed_oops()) { 1449 #if !defined(COMPILER1) || defined(TIERED) 1450 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1451 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1452 } 1453 #endif 1454 #ifdef _WIN64 1455 if (UseLargePages && UseCompressedOops) { 1456 // Cannot allocate guard pages for implicit checks in indexed addressing 1457 // mode, when large pages are specified on windows. 1458 // This flag could be switched ON if narrow oop base address is set to 0, 1459 // see code in Universe::initialize_heap(). 1460 Universe::set_narrow_oop_use_implicit_null_checks(false); 1461 } 1462 #endif // _WIN64 1463 } else { 1464 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1465 warning("Max heap size too large for Compressed Oops"); 1466 FLAG_SET_DEFAULT(UseCompressedOops, false); 1467 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1468 } 1469 } 1470 #endif // _LP64 1471 #endif // ZERO 1472 } 1473 1474 1475 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1476 // set_use_compressed_oops(). 1477 void Arguments::set_use_compressed_klass_ptrs() { 1478 #ifndef ZERO 1479 #ifdef _LP64 1480 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1481 if (!UseCompressedOops) { 1482 if (UseCompressedClassPointers) { 1483 warning("UseCompressedClassPointers requires UseCompressedOops"); 1484 } 1485 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1486 } else { 1487 // Turn on UseCompressedClassPointers too 1488 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1489 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1490 } 1491 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1492 if (UseCompressedClassPointers) { 1493 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1494 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1495 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1496 } 1497 } 1498 } 1499 #endif // _LP64 1500 #endif // !ZERO 1501 } 1502 1503 void Arguments::set_conservative_max_heap_alignment() { 1504 // The conservative maximum required alignment for the heap is the maximum of 1505 // the alignments imposed by several sources: any requirements from the heap 1506 // itself, the collector policy and the maximum page size we may run the VM 1507 // with. 1508 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1509 #if INCLUDE_ALL_GCS 1510 if (UseParallelGC) { 1511 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1512 } else if (UseG1GC) { 1513 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1514 } 1515 #endif // INCLUDE_ALL_GCS 1516 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(), 1517 CollectorPolicy::compute_heap_alignment()); 1518 } 1519 1520 void Arguments::set_ergonomics_flags() { 1521 1522 if (os::is_server_class_machine()) { 1523 // If no other collector is requested explicitly, 1524 // let the VM select the collector based on 1525 // machine class and automatic selection policy. 1526 if (!UseSerialGC && 1527 !UseConcMarkSweepGC && 1528 !UseG1GC && 1529 !UseParNewGC && 1530 FLAG_IS_DEFAULT(UseParallelGC)) { 1531 if (should_auto_select_low_pause_collector()) { 1532 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1533 } else { 1534 FLAG_SET_ERGO(bool, UseParallelGC, true); 1535 } 1536 } 1537 } 1538 #ifdef COMPILER2 1539 // Shared spaces work fine with other GCs but causes bytecode rewriting 1540 // to be disabled, which hurts interpreter performance and decreases 1541 // server performance. When -server is specified, keep the default off 1542 // unless it is asked for. Future work: either add bytecode rewriting 1543 // at link time, or rewrite bytecodes in non-shared methods. 1544 if (!DumpSharedSpaces && !RequireSharedSpaces && 1545 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1546 no_shared_spaces(); 1547 } 1548 #endif 1549 1550 set_conservative_max_heap_alignment(); 1551 1552 #ifndef ZERO 1553 #ifdef _LP64 1554 set_use_compressed_oops(); 1555 1556 // set_use_compressed_klass_ptrs() must be called after calling 1557 // set_use_compressed_oops(). 1558 set_use_compressed_klass_ptrs(); 1559 1560 // Also checks that certain machines are slower with compressed oops 1561 // in vm_version initialization code. 1562 #endif // _LP64 1563 #endif // !ZERO 1564 } 1565 1566 void Arguments::set_parallel_gc_flags() { 1567 assert(UseParallelGC || UseParallelOldGC, "Error"); 1568 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1569 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1570 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1571 } 1572 FLAG_SET_DEFAULT(UseParallelGC, true); 1573 1574 // If no heap maximum was requested explicitly, use some reasonable fraction 1575 // of the physical memory, up to a maximum of 1GB. 1576 FLAG_SET_DEFAULT(ParallelGCThreads, 1577 Abstract_VM_Version::parallel_worker_threads()); 1578 if (ParallelGCThreads == 0) { 1579 jio_fprintf(defaultStream::error_stream(), 1580 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1581 vm_exit(1); 1582 } 1583 1584 if (UseAdaptiveSizePolicy) { 1585 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1586 // unless the user actually sets these flags. 1587 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1588 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1589 } 1590 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1591 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1592 } 1593 } 1594 1595 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1596 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1597 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1598 // See CR 6362902 for details. 1599 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1600 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1601 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1602 } 1603 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1604 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1605 } 1606 } 1607 1608 if (UseParallelOldGC) { 1609 // Par compact uses lower default values since they are treated as 1610 // minimums. These are different defaults because of the different 1611 // interpretation and are not ergonomically set. 1612 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1613 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1614 } 1615 } 1616 } 1617 1618 void Arguments::set_g1_gc_flags() { 1619 assert(UseG1GC, "Error"); 1620 #ifdef COMPILER1 1621 FastTLABRefill = false; 1622 #endif 1623 FLAG_SET_DEFAULT(ParallelGCThreads, 1624 Abstract_VM_Version::parallel_worker_threads()); 1625 if (ParallelGCThreads == 0) { 1626 FLAG_SET_DEFAULT(ParallelGCThreads, 1627 Abstract_VM_Version::parallel_worker_threads()); 1628 } 1629 1630 // MarkStackSize will be set (if it hasn't been set by the user) 1631 // when concurrent marking is initialized. 1632 // Its value will be based upon the number of parallel marking threads. 1633 // But we do set the maximum mark stack size here. 1634 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1635 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1636 } 1637 1638 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1639 // In G1, we want the default GC overhead goal to be higher than 1640 // say in PS. So we set it here to 10%. Otherwise the heap might 1641 // be expanded more aggressively than we would like it to. In 1642 // fact, even 10% seems to not be high enough in some cases 1643 // (especially small GC stress tests that the main thing they do 1644 // is allocation). We might consider increase it further. 1645 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1646 } 1647 1648 if (PrintGCDetails && Verbose) { 1649 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1650 MarkStackSize / K, MarkStackSizeMax / K); 1651 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1652 } 1653 } 1654 1655 julong Arguments::limit_by_allocatable_memory(julong limit) { 1656 julong max_allocatable; 1657 julong result = limit; 1658 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1659 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1660 } 1661 return result; 1662 } 1663 1664 // Use static initialization to get the default before parsing 1665 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1666 1667 void Arguments::set_heap_size() { 1668 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1669 // Deprecated flag 1670 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1671 } 1672 1673 const julong phys_mem = 1674 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1675 : (julong)MaxRAM; 1676 1677 // If the maximum heap size has not been set with -Xmx, 1678 // then set it as fraction of the size of physical memory, 1679 // respecting the maximum and minimum sizes of the heap. 1680 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1681 julong reasonable_max = phys_mem / MaxRAMFraction; 1682 1683 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1684 // Small physical memory, so use a minimum fraction of it for the heap 1685 reasonable_max = phys_mem / MinRAMFraction; 1686 } else { 1687 // Not-small physical memory, so require a heap at least 1688 // as large as MaxHeapSize 1689 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1690 } 1691 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1692 // Limit the heap size to ErgoHeapSizeLimit 1693 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1694 } 1695 if (UseCompressedOops) { 1696 // Limit the heap size to the maximum possible when using compressed oops 1697 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1698 1699 // HeapBaseMinAddress can be greater than default but not less than. 1700 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1701 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1702 // matches compressed oops printing flags 1703 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1704 jio_fprintf(defaultStream::error_stream(), 1705 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1706 " (" UINTX_FORMAT "G) which is greater than value given " 1707 UINTX_FORMAT "\n", 1708 DefaultHeapBaseMinAddress, 1709 DefaultHeapBaseMinAddress/G, 1710 HeapBaseMinAddress); 1711 } 1712 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1713 } 1714 } 1715 1716 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1717 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1718 // but it should be not less than default MaxHeapSize. 1719 max_coop_heap -= HeapBaseMinAddress; 1720 } 1721 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1722 } 1723 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1724 1725 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1726 // An initial heap size was specified on the command line, 1727 // so be sure that the maximum size is consistent. Done 1728 // after call to limit_by_allocatable_memory because that 1729 // method might reduce the allocation size. 1730 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1731 } 1732 1733 if (PrintGCDetails && Verbose) { 1734 // Cannot use gclog_or_tty yet. 1735 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1736 } 1737 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1738 } 1739 1740 // If the minimum or initial heap_size have not been set or requested to be set 1741 // ergonomically, set them accordingly. 1742 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1743 julong reasonable_minimum = (julong)(OldSize + NewSize); 1744 1745 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1746 1747 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1748 1749 if (InitialHeapSize == 0) { 1750 julong reasonable_initial = phys_mem / InitialRAMFraction; 1751 1752 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1753 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1754 1755 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1756 1757 if (PrintGCDetails && Verbose) { 1758 // Cannot use gclog_or_tty yet. 1759 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1760 } 1761 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1762 } 1763 // If the minimum heap size has not been set (via -Xms), 1764 // synchronize with InitialHeapSize to avoid errors with the default value. 1765 if (min_heap_size() == 0) { 1766 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1767 if (PrintGCDetails && Verbose) { 1768 // Cannot use gclog_or_tty yet. 1769 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1770 } 1771 } 1772 } 1773 } 1774 1775 // This must be called after ergonomics because we want bytecode rewriting 1776 // if the server compiler is used, or if UseSharedSpaces is disabled. 1777 void Arguments::set_bytecode_flags() { 1778 // Better not attempt to store into a read-only space. 1779 if (UseSharedSpaces) { 1780 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1781 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1782 } 1783 1784 if (!RewriteBytecodes) { 1785 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1786 } 1787 } 1788 1789 // Aggressive optimization flags -XX:+AggressiveOpts 1790 void Arguments::set_aggressive_opts_flags() { 1791 #ifdef COMPILER2 1792 if (AggressiveUnboxing) { 1793 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1794 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1795 } else if (!EliminateAutoBox) { 1796 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1797 AggressiveUnboxing = false; 1798 } 1799 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1800 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1801 } else if (!DoEscapeAnalysis) { 1802 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1803 AggressiveUnboxing = false; 1804 } 1805 } 1806 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1807 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1808 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1809 } 1810 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1811 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1812 } 1813 1814 // Feed the cache size setting into the JDK 1815 char buffer[1024]; 1816 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1817 add_property(buffer); 1818 } 1819 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1820 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1821 } 1822 #endif 1823 1824 if (AggressiveOpts) { 1825 // Sample flag setting code 1826 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1827 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1828 // } 1829 } 1830 } 1831 1832 //=========================================================================================================== 1833 // Parsing of java.compiler property 1834 1835 void Arguments::process_java_compiler_argument(char* arg) { 1836 // For backwards compatibility, Djava.compiler=NONE or "" 1837 // causes us to switch to -Xint mode UNLESS -Xdebug 1838 // is also specified. 1839 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1840 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1841 } 1842 } 1843 1844 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1845 _sun_java_launcher = strdup(launcher); 1846 } 1847 1848 bool Arguments::created_by_java_launcher() { 1849 assert(_sun_java_launcher != NULL, "property must have value"); 1850 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1851 } 1852 1853 bool Arguments::sun_java_launcher_is_altjvm() { 1854 return _sun_java_launcher_is_altjvm; 1855 } 1856 1857 //=========================================================================================================== 1858 // Parsing of main arguments 1859 1860 bool Arguments::verify_interval(uintx val, uintx min, 1861 uintx max, const char* name) { 1862 // Returns true iff value is in the inclusive interval [min..max] 1863 // false, otherwise. 1864 if (val >= min && val <= max) { 1865 return true; 1866 } 1867 jio_fprintf(defaultStream::error_stream(), 1868 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1869 " and " UINTX_FORMAT "\n", 1870 name, val, min, max); 1871 return false; 1872 } 1873 1874 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1875 // Returns true if given value is at least specified min threshold 1876 // false, otherwise. 1877 if (val >= min ) { 1878 return true; 1879 } 1880 jio_fprintf(defaultStream::error_stream(), 1881 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1882 name, val, min); 1883 return false; 1884 } 1885 1886 bool Arguments::verify_percentage(uintx value, const char* name) { 1887 if (is_percentage(value)) { 1888 return true; 1889 } 1890 jio_fprintf(defaultStream::error_stream(), 1891 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1892 name, value); 1893 return false; 1894 } 1895 1896 #if !INCLUDE_ALL_GCS 1897 #ifdef ASSERT 1898 static bool verify_serial_gc_flags() { 1899 return (UseSerialGC && 1900 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1901 UseParallelGC || UseParallelOldGC)); 1902 } 1903 #endif // ASSERT 1904 #endif // INCLUDE_ALL_GCS 1905 1906 // check if do gclog rotation 1907 // +UseGCLogFileRotation is a must, 1908 // no gc log rotation when log file not supplied or 1909 // NumberOfGCLogFiles is 0 1910 void check_gclog_consistency() { 1911 if (UseGCLogFileRotation) { 1912 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1913 jio_fprintf(defaultStream::output_stream(), 1914 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1915 "where num_of_file > 0\n" 1916 "GC log rotation is turned off\n"); 1917 UseGCLogFileRotation = false; 1918 } 1919 } 1920 1921 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1922 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1923 jio_fprintf(defaultStream::output_stream(), 1924 "GCLogFileSize changed to minimum 8K\n"); 1925 } 1926 } 1927 1928 // This function is called for -Xloggc:<filename>, it can be used 1929 // to check if a given file name(or string) conforms to the following 1930 // specification: 1931 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1932 // %p and %t only allowed once. We only limit usage of filename not path 1933 bool is_filename_valid(const char *file_name) { 1934 const char* p = file_name; 1935 char file_sep = os::file_separator()[0]; 1936 const char* cp; 1937 // skip prefix path 1938 for (cp = file_name; *cp != '\0'; cp++) { 1939 if (*cp == '/' || *cp == file_sep) { 1940 p = cp + 1; 1941 } 1942 } 1943 1944 int count_p = 0; 1945 int count_t = 0; 1946 while (*p != '\0') { 1947 if ((*p >= '0' && *p <= '9') || 1948 (*p >= 'A' && *p <= 'Z') || 1949 (*p >= 'a' && *p <= 'z') || 1950 *p == '-' || 1951 *p == '_' || 1952 *p == '.') { 1953 p++; 1954 continue; 1955 } 1956 if (*p == '%') { 1957 if(*(p + 1) == 'p') { 1958 p += 2; 1959 count_p ++; 1960 continue; 1961 } 1962 if (*(p + 1) == 't') { 1963 p += 2; 1964 count_t ++; 1965 continue; 1966 } 1967 } 1968 return false; 1969 } 1970 return count_p < 2 && count_t < 2; 1971 } 1972 1973 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 1974 if (!is_percentage(min_heap_free_ratio)) { 1975 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 1976 return false; 1977 } 1978 if (min_heap_free_ratio > MaxHeapFreeRatio) { 1979 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1980 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 1981 MaxHeapFreeRatio); 1982 return false; 1983 } 1984 return true; 1985 } 1986 1987 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 1988 if (!is_percentage(max_heap_free_ratio)) { 1989 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 1990 return false; 1991 } 1992 if (max_heap_free_ratio < MinHeapFreeRatio) { 1993 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 1994 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 1995 MinHeapFreeRatio); 1996 return false; 1997 } 1998 return true; 1999 } 2000 2001 // Check consistency of GC selection 2002 bool Arguments::check_gc_consistency() { 2003 check_gclog_consistency(); 2004 bool status = true; 2005 // Ensure that the user has not selected conflicting sets 2006 // of collectors. [Note: this check is merely a user convenience; 2007 // collectors over-ride each other so that only a non-conflicting 2008 // set is selected; however what the user gets is not what they 2009 // may have expected from the combination they asked for. It's 2010 // better to reduce user confusion by not allowing them to 2011 // select conflicting combinations. 2012 uint i = 0; 2013 if (UseSerialGC) i++; 2014 if (UseConcMarkSweepGC || UseParNewGC) i++; 2015 if (UseParallelGC || UseParallelOldGC) i++; 2016 if (UseG1GC) i++; 2017 if (i > 1) { 2018 jio_fprintf(defaultStream::error_stream(), 2019 "Conflicting collector combinations in option list; " 2020 "please refer to the release notes for the combinations " 2021 "allowed\n"); 2022 status = false; 2023 } 2024 return status; 2025 } 2026 2027 void Arguments::check_deprecated_gcs() { 2028 if (UseConcMarkSweepGC && !UseParNewGC) { 2029 warning("Using the DefNew young collector with the CMS collector is deprecated " 2030 "and will likely be removed in a future release"); 2031 } 2032 2033 if (UseParNewGC && !UseConcMarkSweepGC) { 2034 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2035 // set up UseSerialGC properly, so that can't be used in the check here. 2036 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2037 "and will likely be removed in a future release"); 2038 } 2039 2040 if (CMSIncrementalMode) { 2041 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2042 } 2043 } 2044 2045 void Arguments::check_deprecated_gc_flags() { 2046 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2047 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2048 "and will likely be removed in future release"); 2049 } 2050 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2051 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2052 "Use MaxRAMFraction instead."); 2053 } 2054 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2055 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2056 } 2057 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2058 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2059 } 2060 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2061 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2062 } 2063 } 2064 2065 // Check stack pages settings 2066 bool Arguments::check_stack_pages() 2067 { 2068 bool status = true; 2069 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2070 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2071 // greater stack shadow pages can't generate instruction to bang stack 2072 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2073 return status; 2074 } 2075 2076 // Check the consistency of vm_init_args 2077 bool Arguments::check_vm_args_consistency() { 2078 // Method for adding checks for flag consistency. 2079 // The intent is to warn the user of all possible conflicts, 2080 // before returning an error. 2081 // Note: Needs platform-dependent factoring. 2082 bool status = true; 2083 2084 if (TLABRefillWasteFraction == 0) { 2085 jio_fprintf(defaultStream::error_stream(), 2086 "TLABRefillWasteFraction should be a denominator, " 2087 "not " SIZE_FORMAT "\n", 2088 TLABRefillWasteFraction); 2089 status = false; 2090 } 2091 2092 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2093 "AdaptiveSizePolicyWeight"); 2094 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2095 2096 // Divide by bucket size to prevent a large size from causing rollover when 2097 // calculating amount of memory needed to be allocated for the String table. 2098 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2099 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2100 2101 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2102 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2103 2104 { 2105 // Using "else if" below to avoid printing two error messages if min > max. 2106 // This will also prevent us from reporting both min>100 and max>100 at the 2107 // same time, but that is less annoying than printing two identical errors IMHO. 2108 FormatBuffer<80> err_msg(""); 2109 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2110 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2111 status = false; 2112 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2113 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2114 status = false; 2115 } 2116 } 2117 2118 // Min/MaxMetaspaceFreeRatio 2119 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2120 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2121 2122 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2123 jio_fprintf(defaultStream::error_stream(), 2124 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2125 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2126 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2127 MinMetaspaceFreeRatio, 2128 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2129 MaxMetaspaceFreeRatio); 2130 status = false; 2131 } 2132 2133 // Trying to keep 100% free is not practical 2134 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2135 2136 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2137 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2138 } 2139 2140 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2141 // Settings to encourage splitting. 2142 if (!FLAG_IS_CMDLINE(NewRatio)) { 2143 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2144 } 2145 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2146 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2147 } 2148 } 2149 2150 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2151 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2152 if (GCTimeLimit == 100) { 2153 // Turn off gc-overhead-limit-exceeded checks 2154 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2155 } 2156 2157 status = status && check_gc_consistency(); 2158 status = status && check_stack_pages(); 2159 2160 if (CMSIncrementalMode) { 2161 if (!UseConcMarkSweepGC) { 2162 jio_fprintf(defaultStream::error_stream(), 2163 "error: invalid argument combination.\n" 2164 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2165 "selected in order\nto use CMSIncrementalMode.\n"); 2166 status = false; 2167 } else { 2168 status = status && verify_percentage(CMSIncrementalDutyCycle, 2169 "CMSIncrementalDutyCycle"); 2170 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2171 "CMSIncrementalDutyCycleMin"); 2172 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2173 "CMSIncrementalSafetyFactor"); 2174 status = status && verify_percentage(CMSIncrementalOffset, 2175 "CMSIncrementalOffset"); 2176 status = status && verify_percentage(CMSExpAvgFactor, 2177 "CMSExpAvgFactor"); 2178 // If it was not set on the command line, set 2179 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2180 if (CMSInitiatingOccupancyFraction < 0) { 2181 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2182 } 2183 } 2184 } 2185 2186 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2187 // insists that we hold the requisite locks so that the iteration is 2188 // MT-safe. For the verification at start-up and shut-down, we don't 2189 // yet have a good way of acquiring and releasing these locks, 2190 // which are not visible at the CollectedHeap level. We want to 2191 // be able to acquire these locks and then do the iteration rather 2192 // than just disable the lock verification. This will be fixed under 2193 // bug 4788986. 2194 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2195 if (VerifyDuringStartup) { 2196 warning("Heap verification at start-up disabled " 2197 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2198 VerifyDuringStartup = false; // Disable verification at start-up 2199 } 2200 2201 if (VerifyBeforeExit) { 2202 warning("Heap verification at shutdown disabled " 2203 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2204 VerifyBeforeExit = false; // Disable verification at shutdown 2205 } 2206 } 2207 2208 // Note: only executed in non-PRODUCT mode 2209 if (!UseAsyncConcMarkSweepGC && 2210 (ExplicitGCInvokesConcurrent || 2211 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2212 jio_fprintf(defaultStream::error_stream(), 2213 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2214 " with -UseAsyncConcMarkSweepGC"); 2215 status = false; 2216 } 2217 2218 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2219 2220 #if INCLUDE_ALL_GCS 2221 if (UseG1GC) { 2222 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2223 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2224 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2225 2226 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2227 "InitiatingHeapOccupancyPercent"); 2228 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2229 "G1RefProcDrainInterval"); 2230 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2231 "G1ConcMarkStepDurationMillis"); 2232 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2233 "G1ConcRSHotCardLimit"); 2234 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2235 "G1ConcRSLogCacheSize"); 2236 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2237 "StringDeduplicationAgeThreshold"); 2238 } 2239 if (UseConcMarkSweepGC) { 2240 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2241 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2242 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2243 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2244 2245 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2246 2247 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2248 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2249 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2250 2251 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2252 2253 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2254 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2255 2256 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2257 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2258 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2259 2260 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2261 2262 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2263 2264 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2265 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2266 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2267 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2268 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2269 } 2270 2271 if (UseParallelGC || UseParallelOldGC) { 2272 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2273 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2274 2275 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2276 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2277 2278 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2279 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2280 2281 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2282 2283 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2284 } 2285 #endif // INCLUDE_ALL_GCS 2286 2287 status = status && verify_interval(RefDiscoveryPolicy, 2288 ReferenceProcessor::DiscoveryPolicyMin, 2289 ReferenceProcessor::DiscoveryPolicyMax, 2290 "RefDiscoveryPolicy"); 2291 2292 // Limit the lower bound of this flag to 1 as it is used in a division 2293 // expression. 2294 status = status && verify_interval(TLABWasteTargetPercent, 2295 1, 100, "TLABWasteTargetPercent"); 2296 2297 status = status && verify_object_alignment(); 2298 2299 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2300 "CompressedClassSpaceSize"); 2301 2302 status = status && verify_interval(MarkStackSizeMax, 2303 1, (max_jint - 1), "MarkStackSizeMax"); 2304 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2305 2306 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2307 2308 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2309 2310 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2311 2312 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2313 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2314 2315 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2316 2317 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2318 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2319 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2320 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2321 2322 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2323 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2324 2325 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2326 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2327 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2328 2329 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2330 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2331 2332 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2333 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2334 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2335 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2336 2337 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2338 2339 if (PrintNMTStatistics) { 2340 #if INCLUDE_NMT 2341 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2342 #endif // INCLUDE_NMT 2343 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2344 PrintNMTStatistics = false; 2345 #if INCLUDE_NMT 2346 } 2347 #endif 2348 } 2349 2350 // Need to limit the extent of the padding to reasonable size. 2351 // 8K is well beyond the reasonable HW cache line size, even with the 2352 // aggressive prefetching, while still leaving the room for segregating 2353 // among the distinct pages. 2354 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2355 jio_fprintf(defaultStream::error_stream(), 2356 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2357 ContendedPaddingWidth, 0, 8192); 2358 status = false; 2359 } 2360 2361 // Need to enforce the padding not to break the existing field alignments. 2362 // It is sufficient to check against the largest type size. 2363 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2364 jio_fprintf(defaultStream::error_stream(), 2365 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2366 ContendedPaddingWidth, BytesPerLong); 2367 status = false; 2368 } 2369 2370 // Check lower bounds of the code cache 2371 // Template Interpreter code is approximately 3X larger in debug builds. 2372 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2373 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2374 jio_fprintf(defaultStream::error_stream(), 2375 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2376 os::vm_page_size()/K); 2377 status = false; 2378 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2379 jio_fprintf(defaultStream::error_stream(), 2380 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2381 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2382 status = false; 2383 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2384 jio_fprintf(defaultStream::error_stream(), 2385 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2386 min_code_cache_size/K); 2387 status = false; 2388 } else if (ReservedCodeCacheSize > 2*G) { 2389 // Code cache size larger than MAXINT is not supported. 2390 jio_fprintf(defaultStream::error_stream(), 2391 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2392 (2*G)/M); 2393 status = false; 2394 } 2395 2396 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2397 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2398 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2399 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2400 2401 // TieredCompilation needs at least 2 compiler threads. 2402 const int num_min_compiler_threads = (TieredCompilation && (TieredStopAtLevel >= CompLevel_full_optimization)) ? 2 : 1; 2403 status &=verify_min_value(CICompilerCount, num_min_compiler_threads, "CICompilerCount"); 2404 2405 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2406 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2407 } 2408 2409 return status; 2410 } 2411 2412 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2413 const char* option_type) { 2414 if (ignore) return false; 2415 2416 const char* spacer = " "; 2417 if (option_type == NULL) { 2418 option_type = ++spacer; // Set both to the empty string. 2419 } 2420 2421 if (os::obsolete_option(option)) { 2422 jio_fprintf(defaultStream::error_stream(), 2423 "Obsolete %s%soption: %s\n", option_type, spacer, 2424 option->optionString); 2425 return false; 2426 } else { 2427 jio_fprintf(defaultStream::error_stream(), 2428 "Unrecognized %s%soption: %s\n", option_type, spacer, 2429 option->optionString); 2430 return true; 2431 } 2432 } 2433 2434 static const char* user_assertion_options[] = { 2435 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2436 }; 2437 2438 static const char* system_assertion_options[] = { 2439 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2440 }; 2441 2442 // Return true if any of the strings in null-terminated array 'names' matches. 2443 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2444 // the option must match exactly. 2445 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2446 bool tail_allowed) { 2447 for (/* empty */; *names != NULL; ++names) { 2448 if (match_option(option, *names, tail)) { 2449 if (**tail == '\0' || tail_allowed && **tail == ':') { 2450 return true; 2451 } 2452 } 2453 } 2454 return false; 2455 } 2456 2457 bool Arguments::parse_uintx(const char* value, 2458 uintx* uintx_arg, 2459 uintx min_size) { 2460 2461 // Check the sign first since atomull() parses only unsigned values. 2462 bool value_is_positive = !(*value == '-'); 2463 2464 if (value_is_positive) { 2465 julong n; 2466 bool good_return = atomull(value, &n); 2467 if (good_return) { 2468 bool above_minimum = n >= min_size; 2469 bool value_is_too_large = n > max_uintx; 2470 2471 if (above_minimum && !value_is_too_large) { 2472 *uintx_arg = n; 2473 return true; 2474 } 2475 } 2476 } 2477 return false; 2478 } 2479 2480 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2481 julong* long_arg, 2482 julong min_size) { 2483 if (!atomull(s, long_arg)) return arg_unreadable; 2484 return check_memory_size(*long_arg, min_size); 2485 } 2486 2487 // Parse JavaVMInitArgs structure 2488 2489 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2490 // For components of the system classpath. 2491 SysClassPath scp(Arguments::get_sysclasspath()); 2492 bool scp_assembly_required = false; 2493 2494 // Save default settings for some mode flags 2495 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2496 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2497 Arguments::_ClipInlining = ClipInlining; 2498 Arguments::_BackgroundCompilation = BackgroundCompilation; 2499 2500 // Setup flags for mixed which is the default 2501 set_mode_flags(_mixed); 2502 2503 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2504 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2505 if (result != JNI_OK) { 2506 return result; 2507 } 2508 2509 // Parse JavaVMInitArgs structure passed in 2510 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2511 if (result != JNI_OK) { 2512 return result; 2513 } 2514 2515 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2516 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2517 if (result != JNI_OK) { 2518 return result; 2519 } 2520 2521 // Do final processing now that all arguments have been parsed 2522 result = finalize_vm_init_args(&scp, scp_assembly_required); 2523 if (result != JNI_OK) { 2524 return result; 2525 } 2526 2527 return JNI_OK; 2528 } 2529 2530 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2531 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2532 // are dealing with -agentpath (case where name is a path), otherwise with 2533 // -agentlib 2534 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2535 char *_name; 2536 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2537 size_t _len_hprof, _len_jdwp, _len_prefix; 2538 2539 if (is_path) { 2540 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2541 return false; 2542 } 2543 2544 _name++; // skip past last path separator 2545 _len_prefix = strlen(JNI_LIB_PREFIX); 2546 2547 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2548 return false; 2549 } 2550 2551 _name += _len_prefix; 2552 _len_hprof = strlen(_hprof); 2553 _len_jdwp = strlen(_jdwp); 2554 2555 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2556 _name += _len_hprof; 2557 } 2558 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2559 _name += _len_jdwp; 2560 } 2561 else { 2562 return false; 2563 } 2564 2565 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2566 return false; 2567 } 2568 2569 return true; 2570 } 2571 2572 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2573 return true; 2574 } 2575 2576 return false; 2577 } 2578 2579 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2580 SysClassPath* scp_p, 2581 bool* scp_assembly_required_p, 2582 Flag::Flags origin) { 2583 // Remaining part of option string 2584 const char* tail; 2585 2586 // iterate over arguments 2587 for (int index = 0; index < args->nOptions; index++) { 2588 bool is_absolute_path = false; // for -agentpath vs -agentlib 2589 2590 const JavaVMOption* option = args->options + index; 2591 2592 if (!match_option(option, "-Djava.class.path", &tail) && 2593 !match_option(option, "-Dsun.java.command", &tail) && 2594 !match_option(option, "-Dsun.java.launcher", &tail)) { 2595 2596 // add all jvm options to the jvm_args string. This string 2597 // is used later to set the java.vm.args PerfData string constant. 2598 // the -Djava.class.path and the -Dsun.java.command options are 2599 // omitted from jvm_args string as each have their own PerfData 2600 // string constant object. 2601 build_jvm_args(option->optionString); 2602 } 2603 2604 // -verbose:[class/gc/jni] 2605 if (match_option(option, "-verbose", &tail)) { 2606 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2607 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2608 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2609 } else if (!strcmp(tail, ":gc")) { 2610 FLAG_SET_CMDLINE(bool, PrintGC, true); 2611 } else if (!strcmp(tail, ":jni")) { 2612 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2613 } 2614 // -da / -ea / -disableassertions / -enableassertions 2615 // These accept an optional class/package name separated by a colon, e.g., 2616 // -da:java.lang.Thread. 2617 } else if (match_option(option, user_assertion_options, &tail, true)) { 2618 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2619 if (*tail == '\0') { 2620 JavaAssertions::setUserClassDefault(enable); 2621 } else { 2622 assert(*tail == ':', "bogus match by match_option()"); 2623 JavaAssertions::addOption(tail + 1, enable); 2624 } 2625 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2626 } else if (match_option(option, system_assertion_options, &tail, false)) { 2627 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2628 JavaAssertions::setSystemClassDefault(enable); 2629 // -bootclasspath: 2630 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2631 scp_p->reset_path(tail); 2632 *scp_assembly_required_p = true; 2633 // -bootclasspath/a: 2634 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2635 scp_p->add_suffix(tail); 2636 *scp_assembly_required_p = true; 2637 // -bootclasspath/p: 2638 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2639 scp_p->add_prefix(tail); 2640 *scp_assembly_required_p = true; 2641 // -Xrun 2642 } else if (match_option(option, "-Xrun", &tail)) { 2643 if (tail != NULL) { 2644 const char* pos = strchr(tail, ':'); 2645 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2646 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2647 name[len] = '\0'; 2648 2649 char *options = NULL; 2650 if(pos != NULL) { 2651 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2652 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2653 } 2654 #if !INCLUDE_JVMTI 2655 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2656 jio_fprintf(defaultStream::error_stream(), 2657 "Profiling and debugging agents are not supported in this VM\n"); 2658 return JNI_ERR; 2659 } 2660 #endif // !INCLUDE_JVMTI 2661 add_init_library(name, options); 2662 } 2663 // -agentlib and -agentpath 2664 } else if (match_option(option, "-agentlib:", &tail) || 2665 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2666 if(tail != NULL) { 2667 const char* pos = strchr(tail, '='); 2668 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2669 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2670 name[len] = '\0'; 2671 2672 char *options = NULL; 2673 if(pos != NULL) { 2674 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2675 } 2676 #if !INCLUDE_JVMTI 2677 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2678 jio_fprintf(defaultStream::error_stream(), 2679 "Profiling and debugging agents are not supported in this VM\n"); 2680 return JNI_ERR; 2681 } 2682 #endif // !INCLUDE_JVMTI 2683 add_init_agent(name, options, is_absolute_path); 2684 } 2685 // -javaagent 2686 } else if (match_option(option, "-javaagent:", &tail)) { 2687 #if !INCLUDE_JVMTI 2688 jio_fprintf(defaultStream::error_stream(), 2689 "Instrumentation agents are not supported in this VM\n"); 2690 return JNI_ERR; 2691 #else 2692 if(tail != NULL) { 2693 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2694 add_init_agent("instrument", options, false); 2695 } 2696 #endif // !INCLUDE_JVMTI 2697 // -Xnoclassgc 2698 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2699 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2700 // -Xincgc: i-CMS 2701 } else if (match_option(option, "-Xincgc", &tail)) { 2702 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2703 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2704 // -Xnoincgc: no i-CMS 2705 } else if (match_option(option, "-Xnoincgc", &tail)) { 2706 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2707 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2708 // -Xconcgc 2709 } else if (match_option(option, "-Xconcgc", &tail)) { 2710 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2711 // -Xnoconcgc 2712 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2713 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2714 // -Xbatch 2715 } else if (match_option(option, "-Xbatch", &tail)) { 2716 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2717 // -Xmn for compatibility with other JVM vendors 2718 } else if (match_option(option, "-Xmn", &tail)) { 2719 julong long_initial_young_size = 0; 2720 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2721 if (errcode != arg_in_range) { 2722 jio_fprintf(defaultStream::error_stream(), 2723 "Invalid initial young generation size: %s\n", option->optionString); 2724 describe_range_error(errcode); 2725 return JNI_EINVAL; 2726 } 2727 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2728 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2729 // -Xms 2730 } else if (match_option(option, "-Xms", &tail)) { 2731 julong long_initial_heap_size = 0; 2732 // an initial heap size of 0 means automatically determine 2733 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2734 if (errcode != arg_in_range) { 2735 jio_fprintf(defaultStream::error_stream(), 2736 "Invalid initial heap size: %s\n", option->optionString); 2737 describe_range_error(errcode); 2738 return JNI_EINVAL; 2739 } 2740 set_min_heap_size((uintx)long_initial_heap_size); 2741 // Currently the minimum size and the initial heap sizes are the same. 2742 // Can be overridden with -XX:InitialHeapSize. 2743 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2744 // -Xmx 2745 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2746 julong long_max_heap_size = 0; 2747 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2748 if (errcode != arg_in_range) { 2749 jio_fprintf(defaultStream::error_stream(), 2750 "Invalid maximum heap size: %s\n", option->optionString); 2751 describe_range_error(errcode); 2752 return JNI_EINVAL; 2753 } 2754 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2755 // Xmaxf 2756 } else if (match_option(option, "-Xmaxf", &tail)) { 2757 char* err; 2758 int maxf = (int)(strtod(tail, &err) * 100); 2759 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2760 jio_fprintf(defaultStream::error_stream(), 2761 "Bad max heap free percentage size: %s\n", 2762 option->optionString); 2763 return JNI_EINVAL; 2764 } else { 2765 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2766 } 2767 // Xminf 2768 } else if (match_option(option, "-Xminf", &tail)) { 2769 char* err; 2770 int minf = (int)(strtod(tail, &err) * 100); 2771 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2772 jio_fprintf(defaultStream::error_stream(), 2773 "Bad min heap free percentage size: %s\n", 2774 option->optionString); 2775 return JNI_EINVAL; 2776 } else { 2777 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2778 } 2779 // -Xss 2780 } else if (match_option(option, "-Xss", &tail)) { 2781 julong long_ThreadStackSize = 0; 2782 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2783 if (errcode != arg_in_range) { 2784 jio_fprintf(defaultStream::error_stream(), 2785 "Invalid thread stack size: %s\n", option->optionString); 2786 describe_range_error(errcode); 2787 return JNI_EINVAL; 2788 } 2789 // Internally track ThreadStackSize in units of 1024 bytes. 2790 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2791 round_to((int)long_ThreadStackSize, K) / K); 2792 // -Xoss 2793 } else if (match_option(option, "-Xoss", &tail)) { 2794 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2795 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2796 julong long_CodeCacheExpansionSize = 0; 2797 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2798 if (errcode != arg_in_range) { 2799 jio_fprintf(defaultStream::error_stream(), 2800 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2801 os::vm_page_size()/K); 2802 return JNI_EINVAL; 2803 } 2804 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2805 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2806 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2807 julong long_ReservedCodeCacheSize = 0; 2808 2809 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2810 if (errcode != arg_in_range) { 2811 jio_fprintf(defaultStream::error_stream(), 2812 "Invalid maximum code cache size: %s.\n", option->optionString); 2813 return JNI_EINVAL; 2814 } 2815 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2816 //-XX:IncreaseFirstTierCompileThresholdAt= 2817 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2818 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2819 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2820 jio_fprintf(defaultStream::error_stream(), 2821 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2822 option->optionString); 2823 return JNI_EINVAL; 2824 } 2825 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2826 // -green 2827 } else if (match_option(option, "-green", &tail)) { 2828 jio_fprintf(defaultStream::error_stream(), 2829 "Green threads support not available\n"); 2830 return JNI_EINVAL; 2831 // -native 2832 } else if (match_option(option, "-native", &tail)) { 2833 // HotSpot always uses native threads, ignore silently for compatibility 2834 // -Xsqnopause 2835 } else if (match_option(option, "-Xsqnopause", &tail)) { 2836 // EVM option, ignore silently for compatibility 2837 // -Xrs 2838 } else if (match_option(option, "-Xrs", &tail)) { 2839 // Classic/EVM option, new functionality 2840 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2841 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2842 // change default internal VM signals used - lower case for back compat 2843 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2844 // -Xoptimize 2845 } else if (match_option(option, "-Xoptimize", &tail)) { 2846 // EVM option, ignore silently for compatibility 2847 // -Xprof 2848 } else if (match_option(option, "-Xprof", &tail)) { 2849 #if INCLUDE_FPROF 2850 _has_profile = true; 2851 #else // INCLUDE_FPROF 2852 jio_fprintf(defaultStream::error_stream(), 2853 "Flat profiling is not supported in this VM.\n"); 2854 return JNI_ERR; 2855 #endif // INCLUDE_FPROF 2856 // -Xconcurrentio 2857 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2858 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2859 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2860 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2861 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2862 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2863 2864 // -Xinternalversion 2865 } else if (match_option(option, "-Xinternalversion", &tail)) { 2866 jio_fprintf(defaultStream::output_stream(), "%s\n", 2867 VM_Version::internal_vm_info_string()); 2868 vm_exit(0); 2869 #ifndef PRODUCT 2870 // -Xprintflags 2871 } else if (match_option(option, "-Xprintflags", &tail)) { 2872 CommandLineFlags::printFlags(tty, false); 2873 vm_exit(0); 2874 #endif 2875 // -D 2876 } else if (match_option(option, "-D", &tail)) { 2877 if (!add_property(tail)) { 2878 return JNI_ENOMEM; 2879 } 2880 // Out of the box management support 2881 if (match_option(option, "-Dcom.sun.management", &tail)) { 2882 #if INCLUDE_MANAGEMENT 2883 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2884 #else 2885 jio_fprintf(defaultStream::output_stream(), 2886 "-Dcom.sun.management is not supported in this VM.\n"); 2887 return JNI_ERR; 2888 #endif 2889 } 2890 // -Xint 2891 } else if (match_option(option, "-Xint", &tail)) { 2892 set_mode_flags(_int); 2893 // -Xmixed 2894 } else if (match_option(option, "-Xmixed", &tail)) { 2895 set_mode_flags(_mixed); 2896 // -Xcomp 2897 } else if (match_option(option, "-Xcomp", &tail)) { 2898 // for testing the compiler; turn off all flags that inhibit compilation 2899 set_mode_flags(_comp); 2900 // -Xshare:dump 2901 } else if (match_option(option, "-Xshare:dump", &tail)) { 2902 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2903 set_mode_flags(_int); // Prevent compilation, which creates objects 2904 // -Xshare:on 2905 } else if (match_option(option, "-Xshare:on", &tail)) { 2906 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2907 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2908 // -Xshare:auto 2909 } else if (match_option(option, "-Xshare:auto", &tail)) { 2910 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2911 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2912 // -Xshare:off 2913 } else if (match_option(option, "-Xshare:off", &tail)) { 2914 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2915 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2916 // -Xverify 2917 } else if (match_option(option, "-Xverify", &tail)) { 2918 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2919 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2920 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2921 } else if (strcmp(tail, ":remote") == 0) { 2922 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2923 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2924 } else if (strcmp(tail, ":none") == 0) { 2925 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2926 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2927 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2928 return JNI_EINVAL; 2929 } 2930 // -Xdebug 2931 } else if (match_option(option, "-Xdebug", &tail)) { 2932 // note this flag has been used, then ignore 2933 set_xdebug_mode(true); 2934 // -Xnoagent 2935 } else if (match_option(option, "-Xnoagent", &tail)) { 2936 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2937 } else if (match_option(option, "-Xboundthreads", &tail)) { 2938 // Bind user level threads to kernel threads (Solaris only) 2939 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2940 } else if (match_option(option, "-Xloggc:", &tail)) { 2941 // Redirect GC output to the file. -Xloggc:<filename> 2942 // ostream_init_log(), when called will use this filename 2943 // to initialize a fileStream. 2944 _gc_log_filename = strdup(tail); 2945 if (!is_filename_valid(_gc_log_filename)) { 2946 jio_fprintf(defaultStream::output_stream(), 2947 "Invalid file name for use with -Xloggc: Filename can only contain the " 2948 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2949 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2950 return JNI_EINVAL; 2951 } 2952 FLAG_SET_CMDLINE(bool, PrintGC, true); 2953 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2954 2955 // JNI hooks 2956 } else if (match_option(option, "-Xcheck", &tail)) { 2957 if (!strcmp(tail, ":jni")) { 2958 #if !INCLUDE_JNI_CHECK 2959 warning("JNI CHECKING is not supported in this VM"); 2960 #else 2961 CheckJNICalls = true; 2962 #endif // INCLUDE_JNI_CHECK 2963 } else if (is_bad_option(option, args->ignoreUnrecognized, 2964 "check")) { 2965 return JNI_EINVAL; 2966 } 2967 } else if (match_option(option, "vfprintf", &tail)) { 2968 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2969 } else if (match_option(option, "exit", &tail)) { 2970 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2971 } else if (match_option(option, "abort", &tail)) { 2972 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2973 // -XX:+AggressiveHeap 2974 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2975 2976 // This option inspects the machine and attempts to set various 2977 // parameters to be optimal for long-running, memory allocation 2978 // intensive jobs. It is intended for machines with large 2979 // amounts of cpu and memory. 2980 2981 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2982 // VM, but we may not be able to represent the total physical memory 2983 // available (like having 8gb of memory on a box but using a 32bit VM). 2984 // Thus, we need to make sure we're using a julong for intermediate 2985 // calculations. 2986 julong initHeapSize; 2987 julong total_memory = os::physical_memory(); 2988 2989 if (total_memory < (julong)256*M) { 2990 jio_fprintf(defaultStream::error_stream(), 2991 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2992 vm_exit(1); 2993 } 2994 2995 // The heap size is half of available memory, or (at most) 2996 // all of possible memory less 160mb (leaving room for the OS 2997 // when using ISM). This is the maximum; because adaptive sizing 2998 // is turned on below, the actual space used may be smaller. 2999 3000 initHeapSize = MIN2(total_memory / (julong)2, 3001 total_memory - (julong)160*M); 3002 3003 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3004 3005 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3006 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3007 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3008 // Currently the minimum size and the initial heap sizes are the same. 3009 set_min_heap_size(initHeapSize); 3010 } 3011 if (FLAG_IS_DEFAULT(NewSize)) { 3012 // Make the young generation 3/8ths of the total heap. 3013 FLAG_SET_CMDLINE(uintx, NewSize, 3014 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3015 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3016 } 3017 3018 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3019 FLAG_SET_DEFAULT(UseLargePages, true); 3020 #endif 3021 3022 // Increase some data structure sizes for efficiency 3023 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3024 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3025 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3026 3027 // See the OldPLABSize comment below, but replace 'after promotion' 3028 // with 'after copying'. YoungPLABSize is the size of the survivor 3029 // space per-gc-thread buffers. The default is 4kw. 3030 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3031 3032 // OldPLABSize is the size of the buffers in the old gen that 3033 // UseParallelGC uses to promote live data that doesn't fit in the 3034 // survivor spaces. At any given time, there's one for each gc thread. 3035 // The default size is 1kw. These buffers are rarely used, since the 3036 // survivor spaces are usually big enough. For specjbb, however, there 3037 // are occasions when there's lots of live data in the young gen 3038 // and we end up promoting some of it. We don't have a definite 3039 // explanation for why bumping OldPLABSize helps, but the theory 3040 // is that a bigger PLAB results in retaining something like the 3041 // original allocation order after promotion, which improves mutator 3042 // locality. A minor effect may be that larger PLABs reduce the 3043 // number of PLAB allocation events during gc. The value of 8kw 3044 // was arrived at by experimenting with specjbb. 3045 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3046 3047 // Enable parallel GC and adaptive generation sizing 3048 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3049 FLAG_SET_DEFAULT(ParallelGCThreads, 3050 Abstract_VM_Version::parallel_worker_threads()); 3051 3052 // Encourage steady state memory management 3053 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3054 3055 // This appears to improve mutator locality 3056 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3057 3058 // Get around early Solaris scheduling bug 3059 // (affinity vs other jobs on system) 3060 // but disallow DR and offlining (5008695). 3061 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3062 3063 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3064 // and the last option wins. 3065 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3066 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3067 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3068 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3069 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3070 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3071 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3072 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3073 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3074 uintx max_tenuring_thresh = 0; 3075 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3076 jio_fprintf(defaultStream::error_stream(), 3077 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3078 } 3079 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3080 3081 if (MaxTenuringThreshold == 0) { 3082 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3083 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3084 } else { 3085 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3086 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3087 } 3088 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3089 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3090 jio_fprintf(defaultStream::error_stream(), 3091 "Please use CMSClassUnloadingEnabled in place of " 3092 "CMSPermGenSweepingEnabled in the future\n"); 3093 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3094 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3095 jio_fprintf(defaultStream::error_stream(), 3096 "Please use -XX:+UseGCOverheadLimit in place of " 3097 "-XX:+UseGCTimeLimit in the future\n"); 3098 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3099 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3100 jio_fprintf(defaultStream::error_stream(), 3101 "Please use -XX:-UseGCOverheadLimit in place of " 3102 "-XX:-UseGCTimeLimit in the future\n"); 3103 // The TLE options are for compatibility with 1.3 and will be 3104 // removed without notice in a future release. These options 3105 // are not to be documented. 3106 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3107 // No longer used. 3108 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3109 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3110 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3111 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3112 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3113 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3114 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3115 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3116 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3117 // No longer used. 3118 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3119 julong long_tlab_size = 0; 3120 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3121 if (errcode != arg_in_range) { 3122 jio_fprintf(defaultStream::error_stream(), 3123 "Invalid TLAB size: %s\n", option->optionString); 3124 describe_range_error(errcode); 3125 return JNI_EINVAL; 3126 } 3127 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3128 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3129 // No longer used. 3130 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3131 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3132 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3133 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3134 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3135 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3136 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3137 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3138 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3139 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3140 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3141 #if defined(DTRACE_ENABLED) 3142 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3143 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3144 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3145 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3146 #else // defined(DTRACE_ENABLED) 3147 jio_fprintf(defaultStream::error_stream(), 3148 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3149 return JNI_EINVAL; 3150 #endif // defined(DTRACE_ENABLED) 3151 #ifdef ASSERT 3152 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3153 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3154 // disable scavenge before parallel mark-compact 3155 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3156 #endif 3157 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3158 julong cms_blocks_to_claim = (julong)atol(tail); 3159 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3160 jio_fprintf(defaultStream::error_stream(), 3161 "Please use -XX:OldPLABSize in place of " 3162 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3163 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3164 julong cms_blocks_to_claim = (julong)atol(tail); 3165 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3166 jio_fprintf(defaultStream::error_stream(), 3167 "Please use -XX:OldPLABSize in place of " 3168 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3169 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3170 julong old_plab_size = 0; 3171 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3172 if (errcode != arg_in_range) { 3173 jio_fprintf(defaultStream::error_stream(), 3174 "Invalid old PLAB size: %s\n", option->optionString); 3175 describe_range_error(errcode); 3176 return JNI_EINVAL; 3177 } 3178 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3179 jio_fprintf(defaultStream::error_stream(), 3180 "Please use -XX:OldPLABSize in place of " 3181 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3182 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3183 julong young_plab_size = 0; 3184 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3185 if (errcode != arg_in_range) { 3186 jio_fprintf(defaultStream::error_stream(), 3187 "Invalid young PLAB size: %s\n", option->optionString); 3188 describe_range_error(errcode); 3189 return JNI_EINVAL; 3190 } 3191 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3192 jio_fprintf(defaultStream::error_stream(), 3193 "Please use -XX:YoungPLABSize in place of " 3194 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3195 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3196 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3197 julong stack_size = 0; 3198 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3199 if (errcode != arg_in_range) { 3200 jio_fprintf(defaultStream::error_stream(), 3201 "Invalid mark stack size: %s\n", option->optionString); 3202 describe_range_error(errcode); 3203 return JNI_EINVAL; 3204 } 3205 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3206 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3207 julong max_stack_size = 0; 3208 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3209 if (errcode != arg_in_range) { 3210 jio_fprintf(defaultStream::error_stream(), 3211 "Invalid maximum mark stack size: %s\n", 3212 option->optionString); 3213 describe_range_error(errcode); 3214 return JNI_EINVAL; 3215 } 3216 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3217 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3218 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3219 uintx conc_threads = 0; 3220 if (!parse_uintx(tail, &conc_threads, 1)) { 3221 jio_fprintf(defaultStream::error_stream(), 3222 "Invalid concurrent threads: %s\n", option->optionString); 3223 return JNI_EINVAL; 3224 } 3225 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3226 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3227 julong max_direct_memory_size = 0; 3228 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3229 if (errcode != arg_in_range) { 3230 jio_fprintf(defaultStream::error_stream(), 3231 "Invalid maximum direct memory size: %s\n", 3232 option->optionString); 3233 describe_range_error(errcode); 3234 return JNI_EINVAL; 3235 } 3236 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3237 #if !INCLUDE_MANAGEMENT 3238 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3239 jio_fprintf(defaultStream::error_stream(), 3240 "ManagementServer is not supported in this VM.\n"); 3241 return JNI_ERR; 3242 #endif // INCLUDE_MANAGEMENT 3243 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3244 // Skip -XX:Flags= since that case has already been handled 3245 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3246 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3247 return JNI_EINVAL; 3248 } 3249 } 3250 // Unknown option 3251 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3252 return JNI_ERR; 3253 } 3254 } 3255 3256 // Change the default value for flags which have different default values 3257 // when working with older JDKs. 3258 #ifdef LINUX 3259 if (JDK_Version::current().compare_major(6) <= 0 && 3260 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3261 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3262 } 3263 #endif // LINUX 3264 return JNI_OK; 3265 } 3266 3267 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3268 // This must be done after all -D arguments have been processed. 3269 scp_p->expand_endorsed(); 3270 3271 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3272 // Assemble the bootclasspath elements into the final path. 3273 Arguments::set_sysclasspath(scp_p->combined_path()); 3274 } 3275 3276 // This must be done after all arguments have been processed. 3277 // java_compiler() true means set to "NONE" or empty. 3278 if (java_compiler() && !xdebug_mode()) { 3279 // For backwards compatibility, we switch to interpreted mode if 3280 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3281 // not specified. 3282 set_mode_flags(_int); 3283 } 3284 if (CompileThreshold == 0) { 3285 set_mode_flags(_int); 3286 } 3287 3288 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3289 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3290 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3291 } 3292 3293 #ifndef COMPILER2 3294 // Don't degrade server performance for footprint 3295 if (FLAG_IS_DEFAULT(UseLargePages) && 3296 MaxHeapSize < LargePageHeapSizeThreshold) { 3297 // No need for large granularity pages w/small heaps. 3298 // Note that large pages are enabled/disabled for both the 3299 // Java heap and the code cache. 3300 FLAG_SET_DEFAULT(UseLargePages, false); 3301 } 3302 3303 #else 3304 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3305 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3306 } 3307 #endif 3308 3309 #ifndef TIERED 3310 // Tiered compilation is undefined. 3311 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3312 #endif 3313 3314 // If we are running in a headless jre, force java.awt.headless property 3315 // to be true unless the property has already been set. 3316 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3317 if (os::is_headless_jre()) { 3318 const char* headless = Arguments::get_property("java.awt.headless"); 3319 if (headless == NULL) { 3320 char envbuffer[128]; 3321 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3322 if (!add_property("java.awt.headless=true")) { 3323 return JNI_ENOMEM; 3324 } 3325 } else { 3326 char buffer[256]; 3327 strcpy(buffer, "java.awt.headless="); 3328 strcat(buffer, envbuffer); 3329 if (!add_property(buffer)) { 3330 return JNI_ENOMEM; 3331 } 3332 } 3333 } 3334 } 3335 3336 if (!check_vm_args_consistency()) { 3337 return JNI_ERR; 3338 } 3339 3340 return JNI_OK; 3341 } 3342 3343 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3344 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3345 scp_assembly_required_p); 3346 } 3347 3348 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3349 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3350 scp_assembly_required_p); 3351 } 3352 3353 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3354 const int N_MAX_OPTIONS = 64; 3355 const int OPTION_BUFFER_SIZE = 1024; 3356 char buffer[OPTION_BUFFER_SIZE]; 3357 3358 // The variable will be ignored if it exceeds the length of the buffer. 3359 // Don't check this variable if user has special privileges 3360 // (e.g. unix su command). 3361 if (os::getenv(name, buffer, sizeof(buffer)) && 3362 !os::have_special_privileges()) { 3363 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3364 jio_fprintf(defaultStream::error_stream(), 3365 "Picked up %s: %s\n", name, buffer); 3366 char* rd = buffer; // pointer to the input string (rd) 3367 int i; 3368 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3369 while (isspace(*rd)) rd++; // skip whitespace 3370 if (*rd == 0) break; // we re done when the input string is read completely 3371 3372 // The output, option string, overwrites the input string. 3373 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3374 // input string (rd). 3375 char* wrt = rd; 3376 3377 options[i++].optionString = wrt; // Fill in option 3378 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3379 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3380 int quote = *rd; // matching quote to look for 3381 rd++; // don't copy open quote 3382 while (*rd != quote) { // include everything (even spaces) up until quote 3383 if (*rd == 0) { // string termination means unmatched string 3384 jio_fprintf(defaultStream::error_stream(), 3385 "Unmatched quote in %s\n", name); 3386 return JNI_ERR; 3387 } 3388 *wrt++ = *rd++; // copy to option string 3389 } 3390 rd++; // don't copy close quote 3391 } else { 3392 *wrt++ = *rd++; // copy to option string 3393 } 3394 } 3395 // Need to check if we're done before writing a NULL, 3396 // because the write could be to the byte that rd is pointing to. 3397 if (*rd++ == 0) { 3398 *wrt = 0; 3399 break; 3400 } 3401 *wrt = 0; // Zero terminate option 3402 } 3403 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3404 JavaVMInitArgs vm_args; 3405 vm_args.version = JNI_VERSION_1_2; 3406 vm_args.options = options; 3407 vm_args.nOptions = i; 3408 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3409 3410 if (PrintVMOptions) { 3411 const char* tail; 3412 for (int i = 0; i < vm_args.nOptions; i++) { 3413 const JavaVMOption *option = vm_args.options + i; 3414 if (match_option(option, "-XX:", &tail)) { 3415 logOption(tail); 3416 } 3417 } 3418 } 3419 3420 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3421 } 3422 return JNI_OK; 3423 } 3424 3425 void Arguments::set_shared_spaces_flags() { 3426 if (DumpSharedSpaces) { 3427 if (RequireSharedSpaces) { 3428 warning("cannot dump shared archive while using shared archive"); 3429 } 3430 UseSharedSpaces = false; 3431 #ifdef _LP64 3432 if (!UseCompressedOops || !UseCompressedClassPointers) { 3433 vm_exit_during_initialization( 3434 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3435 } 3436 } else { 3437 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces. 3438 if (!UseCompressedOops || !UseCompressedClassPointers) { 3439 no_shared_spaces(); 3440 } 3441 #endif 3442 } 3443 } 3444 3445 #if !INCLUDE_ALL_GCS 3446 static void force_serial_gc() { 3447 FLAG_SET_DEFAULT(UseSerialGC, true); 3448 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3449 UNSUPPORTED_GC_OPTION(UseG1GC); 3450 UNSUPPORTED_GC_OPTION(UseParallelGC); 3451 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3452 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3453 UNSUPPORTED_GC_OPTION(UseParNewGC); 3454 } 3455 #endif // INCLUDE_ALL_GCS 3456 3457 // Sharing support 3458 // Construct the path to the archive 3459 static char* get_shared_archive_path() { 3460 char *shared_archive_path; 3461 if (SharedArchiveFile == NULL) { 3462 char jvm_path[JVM_MAXPATHLEN]; 3463 os::jvm_path(jvm_path, sizeof(jvm_path)); 3464 char *end = strrchr(jvm_path, *os::file_separator()); 3465 if (end != NULL) *end = '\0'; 3466 size_t jvm_path_len = strlen(jvm_path); 3467 size_t file_sep_len = strlen(os::file_separator()); 3468 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3469 file_sep_len + 20, mtInternal); 3470 if (shared_archive_path != NULL) { 3471 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3472 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3473 strncat(shared_archive_path, "classes.jsa", 11); 3474 } 3475 } else { 3476 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3477 if (shared_archive_path != NULL) { 3478 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3479 } 3480 } 3481 return shared_archive_path; 3482 } 3483 3484 #ifndef PRODUCT 3485 // Determine whether LogVMOutput should be implicitly turned on. 3486 static bool use_vm_log() { 3487 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3488 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3489 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3490 PrintAssembly || TraceDeoptimization || TraceDependencies || 3491 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3492 return true; 3493 } 3494 3495 #ifdef COMPILER1 3496 if (PrintC1Statistics) { 3497 return true; 3498 } 3499 #endif // COMPILER1 3500 3501 #ifdef COMPILER2 3502 if (PrintOptoAssembly || PrintOptoStatistics) { 3503 return true; 3504 } 3505 #endif // COMPILER2 3506 3507 return false; 3508 } 3509 #endif // PRODUCT 3510 3511 // Parse entry point called from JNI_CreateJavaVM 3512 3513 jint Arguments::parse(const JavaVMInitArgs* args) { 3514 3515 // Remaining part of option string 3516 const char* tail; 3517 3518 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3519 const char* hotspotrc = ".hotspotrc"; 3520 bool settings_file_specified = false; 3521 bool needs_hotspotrc_warning = false; 3522 3523 const char* flags_file; 3524 int index; 3525 for (index = 0; index < args->nOptions; index++) { 3526 const JavaVMOption *option = args->options + index; 3527 if (match_option(option, "-XX:Flags=", &tail)) { 3528 flags_file = tail; 3529 settings_file_specified = true; 3530 } 3531 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3532 PrintVMOptions = true; 3533 } 3534 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3535 PrintVMOptions = false; 3536 } 3537 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3538 IgnoreUnrecognizedVMOptions = true; 3539 } 3540 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3541 IgnoreUnrecognizedVMOptions = false; 3542 } 3543 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3544 CommandLineFlags::printFlags(tty, false); 3545 vm_exit(0); 3546 } 3547 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3548 #if INCLUDE_NMT 3549 MemTracker::init_tracking_options(tail); 3550 #else 3551 jio_fprintf(defaultStream::error_stream(), 3552 "Native Memory Tracking is not supported in this VM\n"); 3553 return JNI_ERR; 3554 #endif 3555 } 3556 3557 3558 #ifndef PRODUCT 3559 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3560 CommandLineFlags::printFlags(tty, true); 3561 vm_exit(0); 3562 } 3563 #endif 3564 } 3565 3566 if (IgnoreUnrecognizedVMOptions) { 3567 // uncast const to modify the flag args->ignoreUnrecognized 3568 *(jboolean*)(&args->ignoreUnrecognized) = true; 3569 } 3570 3571 // Parse specified settings file 3572 if (settings_file_specified) { 3573 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3574 return JNI_EINVAL; 3575 } 3576 } else { 3577 #ifdef ASSERT 3578 // Parse default .hotspotrc settings file 3579 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3580 return JNI_EINVAL; 3581 } 3582 #else 3583 struct stat buf; 3584 if (os::stat(hotspotrc, &buf) == 0) { 3585 needs_hotspotrc_warning = true; 3586 } 3587 #endif 3588 } 3589 3590 if (PrintVMOptions) { 3591 for (index = 0; index < args->nOptions; index++) { 3592 const JavaVMOption *option = args->options + index; 3593 if (match_option(option, "-XX:", &tail)) { 3594 logOption(tail); 3595 } 3596 } 3597 } 3598 3599 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3600 jint result = parse_vm_init_args(args); 3601 if (result != JNI_OK) { 3602 return result; 3603 } 3604 3605 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3606 SharedArchivePath = get_shared_archive_path(); 3607 if (SharedArchivePath == NULL) { 3608 return JNI_ENOMEM; 3609 } 3610 3611 // Delay warning until here so that we've had a chance to process 3612 // the -XX:-PrintWarnings flag 3613 if (needs_hotspotrc_warning) { 3614 warning("%s file is present but has been ignored. " 3615 "Run with -XX:Flags=%s to load the file.", 3616 hotspotrc, hotspotrc); 3617 } 3618 3619 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3620 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3621 #endif 3622 3623 #if INCLUDE_ALL_GCS 3624 #if (defined JAVASE_EMBEDDED || defined ARM) 3625 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3626 #endif 3627 #endif 3628 3629 #ifndef PRODUCT 3630 if (TraceBytecodesAt != 0) { 3631 TraceBytecodes = true; 3632 } 3633 if (CountCompiledCalls) { 3634 if (UseCounterDecay) { 3635 warning("UseCounterDecay disabled because CountCalls is set"); 3636 UseCounterDecay = false; 3637 } 3638 } 3639 #endif // PRODUCT 3640 3641 // JSR 292 is not supported before 1.7 3642 if (!JDK_Version::is_gte_jdk17x_version()) { 3643 if (EnableInvokeDynamic) { 3644 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3645 warning("JSR 292 is not supported before 1.7. Disabling support."); 3646 } 3647 EnableInvokeDynamic = false; 3648 } 3649 } 3650 3651 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3652 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3653 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3654 } 3655 ScavengeRootsInCode = 1; 3656 } 3657 3658 if (PrintGCDetails) { 3659 // Turn on -verbose:gc options as well 3660 PrintGC = true; 3661 } 3662 3663 if (!JDK_Version::is_gte_jdk18x_version()) { 3664 // To avoid changing the log format for 7 updates this flag is only 3665 // true by default in JDK8 and above. 3666 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3667 FLAG_SET_DEFAULT(PrintGCCause, false); 3668 } 3669 } 3670 3671 // Set object alignment values. 3672 set_object_alignment(); 3673 3674 #if !INCLUDE_ALL_GCS 3675 force_serial_gc(); 3676 #endif // INCLUDE_ALL_GCS 3677 #if !INCLUDE_CDS 3678 if (DumpSharedSpaces || RequireSharedSpaces) { 3679 jio_fprintf(defaultStream::error_stream(), 3680 "Shared spaces are not supported in this VM\n"); 3681 return JNI_ERR; 3682 } 3683 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3684 warning("Shared spaces are not supported in this VM"); 3685 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3686 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3687 } 3688 no_shared_spaces(); 3689 #endif // INCLUDE_CDS 3690 3691 return JNI_OK; 3692 } 3693 3694 jint Arguments::apply_ergo() { 3695 3696 // Set flags based on ergonomics. 3697 set_ergonomics_flags(); 3698 3699 set_shared_spaces_flags(); 3700 3701 // Check the GC selections again. 3702 if (!check_gc_consistency()) { 3703 return JNI_EINVAL; 3704 } 3705 3706 if (TieredCompilation) { 3707 set_tiered_flags(); 3708 } else { 3709 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3710 if (CompilationPolicyChoice >= 2) { 3711 vm_exit_during_initialization( 3712 "Incompatible compilation policy selected", NULL); 3713 } 3714 } 3715 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 3716 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3717 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 3718 } 3719 3720 3721 // Set heap size based on available physical memory 3722 set_heap_size(); 3723 3724 #if INCLUDE_ALL_GCS 3725 // Set per-collector flags 3726 if (UseParallelGC || UseParallelOldGC) { 3727 set_parallel_gc_flags(); 3728 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 3729 set_cms_and_parnew_gc_flags(); 3730 } else if (UseParNewGC) { // Skipped if CMS is set above 3731 set_parnew_gc_flags(); 3732 } else if (UseG1GC) { 3733 set_g1_gc_flags(); 3734 } 3735 check_deprecated_gcs(); 3736 check_deprecated_gc_flags(); 3737 if (AssumeMP && !UseSerialGC) { 3738 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3739 warning("If the number of processors is expected to increase from one, then" 3740 " you should configure the number of parallel GC threads appropriately" 3741 " using -XX:ParallelGCThreads=N"); 3742 } 3743 } 3744 if (MinHeapFreeRatio == 100) { 3745 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 3746 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 3747 } 3748 #else // INCLUDE_ALL_GCS 3749 assert(verify_serial_gc_flags(), "SerialGC unset"); 3750 #endif // INCLUDE_ALL_GCS 3751 3752 // Initialize Metaspace flags and alignments 3753 Metaspace::ergo_initialize(); 3754 3755 // Set bytecode rewriting flags 3756 set_bytecode_flags(); 3757 3758 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3759 set_aggressive_opts_flags(); 3760 3761 // Turn off biased locking for locking debug mode flags, 3762 // which are subtly different from each other but neither works with 3763 // biased locking 3764 if (UseHeavyMonitors 3765 #ifdef COMPILER1 3766 || !UseFastLocking 3767 #endif // COMPILER1 3768 ) { 3769 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3770 // flag set to true on command line; warn the user that they 3771 // can't enable biased locking here 3772 warning("Biased Locking is not supported with locking debug flags" 3773 "; ignoring UseBiasedLocking flag." ); 3774 } 3775 UseBiasedLocking = false; 3776 } 3777 3778 #ifdef ZERO 3779 // Clear flags not supported on zero. 3780 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3781 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3782 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3783 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3784 #endif // CC_INTERP 3785 3786 #ifdef COMPILER2 3787 if (!EliminateLocks) { 3788 EliminateNestedLocks = false; 3789 } 3790 if (!Inline) { 3791 IncrementalInline = false; 3792 } 3793 #ifndef PRODUCT 3794 if (!IncrementalInline) { 3795 AlwaysIncrementalInline = false; 3796 } 3797 #endif 3798 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3799 // nothing to use the profiling, turn if off 3800 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3801 } 3802 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) { 3803 // Doing the replace in parent maps helps speculation 3804 FLAG_SET_DEFAULT(ReplaceInParentMaps, true); 3805 } 3806 #endif 3807 3808 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3809 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3810 DebugNonSafepoints = true; 3811 } 3812 3813 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3814 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3815 } 3816 3817 #ifndef PRODUCT 3818 if (CompileTheWorld) { 3819 // Force NmethodSweeper to sweep whole CodeCache each time. 3820 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3821 NmethodSweepFraction = 1; 3822 } 3823 } 3824 3825 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3826 if (use_vm_log()) { 3827 LogVMOutput = true; 3828 } 3829 } 3830 #endif // PRODUCT 3831 3832 if (PrintCommandLineFlags) { 3833 CommandLineFlags::printSetFlags(tty); 3834 } 3835 3836 // Apply CPU specific policy for the BiasedLocking 3837 if (UseBiasedLocking) { 3838 if (!VM_Version::use_biased_locking() && 3839 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3840 UseBiasedLocking = false; 3841 } 3842 } 3843 #ifdef COMPILER2 3844 if (!UseBiasedLocking || EmitSync != 0) { 3845 UseOptoBiasInlining = false; 3846 } 3847 #endif 3848 3849 return JNI_OK; 3850 } 3851 3852 jint Arguments::adjust_after_os() { 3853 if (UseNUMA) { 3854 if (UseParallelGC || UseParallelOldGC) { 3855 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3856 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3857 } 3858 } 3859 // UseNUMAInterleaving is set to ON for all collectors and 3860 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3861 // such as the parallel collector for Linux and Solaris will 3862 // interleave old gen and survivor spaces on top of NUMA 3863 // allocation policy for the eden space. 3864 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3865 // all platforms and ParallelGC on Windows will interleave all 3866 // of the heap spaces across NUMA nodes. 3867 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3868 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3869 } 3870 } 3871 return JNI_OK; 3872 } 3873 3874 int Arguments::PropertyList_count(SystemProperty* pl) { 3875 int count = 0; 3876 while(pl != NULL) { 3877 count++; 3878 pl = pl->next(); 3879 } 3880 return count; 3881 } 3882 3883 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3884 assert(key != NULL, "just checking"); 3885 SystemProperty* prop; 3886 for (prop = pl; prop != NULL; prop = prop->next()) { 3887 if (strcmp(key, prop->key()) == 0) return prop->value(); 3888 } 3889 return NULL; 3890 } 3891 3892 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3893 int count = 0; 3894 const char* ret_val = NULL; 3895 3896 while(pl != NULL) { 3897 if(count >= index) { 3898 ret_val = pl->key(); 3899 break; 3900 } 3901 count++; 3902 pl = pl->next(); 3903 } 3904 3905 return ret_val; 3906 } 3907 3908 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3909 int count = 0; 3910 char* ret_val = NULL; 3911 3912 while(pl != NULL) { 3913 if(count >= index) { 3914 ret_val = pl->value(); 3915 break; 3916 } 3917 count++; 3918 pl = pl->next(); 3919 } 3920 3921 return ret_val; 3922 } 3923 3924 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3925 SystemProperty* p = *plist; 3926 if (p == NULL) { 3927 *plist = new_p; 3928 } else { 3929 while (p->next() != NULL) { 3930 p = p->next(); 3931 } 3932 p->set_next(new_p); 3933 } 3934 } 3935 3936 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3937 if (plist == NULL) 3938 return; 3939 3940 SystemProperty* new_p = new SystemProperty(k, v, true); 3941 PropertyList_add(plist, new_p); 3942 } 3943 3944 // This add maintains unique property key in the list. 3945 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3946 if (plist == NULL) 3947 return; 3948 3949 // If property key exist then update with new value. 3950 SystemProperty* prop; 3951 for (prop = *plist; prop != NULL; prop = prop->next()) { 3952 if (strcmp(k, prop->key()) == 0) { 3953 if (append) { 3954 prop->append_value(v); 3955 } else { 3956 prop->set_value(v); 3957 } 3958 return; 3959 } 3960 } 3961 3962 PropertyList_add(plist, k, v); 3963 } 3964 3965 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3966 // Returns true if all of the source pointed by src has been copied over to 3967 // the destination buffer pointed by buf. Otherwise, returns false. 3968 // Notes: 3969 // 1. If the length (buflen) of the destination buffer excluding the 3970 // NULL terminator character is not long enough for holding the expanded 3971 // pid characters, it also returns false instead of returning the partially 3972 // expanded one. 3973 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3974 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3975 char* buf, size_t buflen) { 3976 const char* p = src; 3977 char* b = buf; 3978 const char* src_end = &src[srclen]; 3979 char* buf_end = &buf[buflen - 1]; 3980 3981 while (p < src_end && b < buf_end) { 3982 if (*p == '%') { 3983 switch (*(++p)) { 3984 case '%': // "%%" ==> "%" 3985 *b++ = *p++; 3986 break; 3987 case 'p': { // "%p" ==> current process id 3988 // buf_end points to the character before the last character so 3989 // that we could write '\0' to the end of the buffer. 3990 size_t buf_sz = buf_end - b + 1; 3991 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3992 3993 // if jio_snprintf fails or the buffer is not long enough to hold 3994 // the expanded pid, returns false. 3995 if (ret < 0 || ret >= (int)buf_sz) { 3996 return false; 3997 } else { 3998 b += ret; 3999 assert(*b == '\0', "fail in copy_expand_pid"); 4000 if (p == src_end && b == buf_end + 1) { 4001 // reach the end of the buffer. 4002 return true; 4003 } 4004 } 4005 p++; 4006 break; 4007 } 4008 default : 4009 *b++ = '%'; 4010 } 4011 } else { 4012 *b++ = *p++; 4013 } 4014 } 4015 *b = '\0'; 4016 return (p == src_end); // return false if not all of the source was copied 4017 }