1 /* 2 * Copyright (c) 1997, 2019, 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/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/symbolTable.hpp" 29 #include "compiler/compilerOracle.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/cardTableRS.hpp" 32 #include "memory/genCollectedHeap.hpp" 33 #include "memory/referenceProcessor.hpp" 34 #include "memory/universe.inline.hpp" 35 #include "oops/oop.inline.hpp" 36 #include "prims/jvmtiExport.hpp" 37 #include "runtime/arguments.hpp" 38 #include "runtime/arguments_ext.hpp" 39 #include "runtime/globals_extension.hpp" 40 #include "runtime/java.hpp" 41 #include "services/management.hpp" 42 #include "services/memTracker.hpp" 43 #include "utilities/defaultStream.hpp" 44 #include "utilities/macros.hpp" 45 #include "utilities/stringUtils.hpp" 46 #include "utilities/taskqueue.hpp" 47 #if INCLUDE_JFR 48 #include "jfr/jfr.hpp" 49 #endif 50 #ifdef TARGET_OS_FAMILY_linux 51 # include "os_linux.inline.hpp" 52 #endif 53 #ifdef TARGET_OS_FAMILY_solaris 54 # include "os_solaris.inline.hpp" 55 #endif 56 #ifdef TARGET_OS_FAMILY_windows 57 # include "os_windows.inline.hpp" 58 #endif 59 #ifdef TARGET_OS_FAMILY_aix 60 # include "os_aix.inline.hpp" 61 #endif 62 #ifdef TARGET_OS_FAMILY_bsd 63 # include "os_bsd.inline.hpp" 64 #endif 65 #if INCLUDE_ALL_GCS 66 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 67 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 68 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 69 #endif // INCLUDE_ALL_GCS 70 71 // Note: This is a special bug reporting site for the JVM 72 #ifdef VENDOR_URL_VM_BUG 73 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG 74 #else 75 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 76 #endif 77 #define DEFAULT_JAVA_LAUNCHER "generic" 78 79 // Disable options not supported in this release, with a warning if they 80 // were explicitly requested on the command-line 81 #define UNSUPPORTED_OPTION(opt, description) \ 82 do { \ 83 if (opt) { \ 84 if (FLAG_IS_CMDLINE(opt)) { \ 85 warning(description " is disabled in this release."); \ 86 } \ 87 FLAG_SET_DEFAULT(opt, false); \ 88 } \ 89 } while(0) 90 91 #define UNSUPPORTED_GC_OPTION(gc) \ 92 do { \ 93 if (gc) { \ 94 if (FLAG_IS_CMDLINE(gc)) { \ 95 warning(#gc " is not supported in this VM. Using Serial GC."); \ 96 } \ 97 FLAG_SET_DEFAULT(gc, false); \ 98 } \ 99 } while(0) 100 101 char** Arguments::_jvm_flags_array = NULL; 102 int Arguments::_num_jvm_flags = 0; 103 char** Arguments::_jvm_args_array = NULL; 104 int Arguments::_num_jvm_args = 0; 105 char* Arguments::_java_command = NULL; 106 SystemProperty* Arguments::_system_properties = NULL; 107 const char* Arguments::_gc_log_filename = NULL; 108 bool Arguments::_has_profile = false; 109 size_t Arguments::_conservative_max_heap_alignment = 0; 110 uintx Arguments::_min_heap_size = 0; 111 uintx Arguments::_min_heap_free_ratio = 0; 112 uintx Arguments::_max_heap_free_ratio = 0; 113 Arguments::Mode Arguments::_mode = _mixed; 114 bool Arguments::_java_compiler = false; 115 bool Arguments::_xdebug_mode = false; 116 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 117 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 118 int Arguments::_sun_java_launcher_pid = -1; 119 bool Arguments::_created_by_gamma_launcher = false; 120 121 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 122 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 123 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 124 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 125 bool Arguments::_ClipInlining = ClipInlining; 126 127 char* Arguments::SharedArchivePath = NULL; 128 129 AgentLibraryList Arguments::_libraryList; 130 AgentLibraryList Arguments::_agentList; 131 132 abort_hook_t Arguments::_abort_hook = NULL; 133 exit_hook_t Arguments::_exit_hook = NULL; 134 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 135 136 137 SystemProperty *Arguments::_java_ext_dirs = NULL; 138 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 139 SystemProperty *Arguments::_sun_boot_library_path = NULL; 140 SystemProperty *Arguments::_java_library_path = NULL; 141 SystemProperty *Arguments::_java_home = NULL; 142 SystemProperty *Arguments::_java_class_path = NULL; 143 SystemProperty *Arguments::_sun_boot_class_path = NULL; 144 145 char* Arguments::_meta_index_path = NULL; 146 char* Arguments::_meta_index_dir = NULL; 147 148 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 149 150 static bool match_option(const JavaVMOption *option, const char* name, 151 const char** tail) { 152 int len = (int)strlen(name); 153 if (strncmp(option->optionString, name, len) == 0) { 154 *tail = option->optionString + len; 155 return true; 156 } else { 157 return false; 158 } 159 } 160 161 #if INCLUDE_JFR 162 // return true on failure 163 static bool match_jfr_option(const JavaVMOption** option) { 164 assert((*option)->optionString != NULL, "invariant"); 165 char* tail = NULL; 166 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 167 return Jfr::on_start_flight_recording_option(option, tail); 168 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 169 return Jfr::on_flight_recorder_option(option, tail); 170 } 171 return false; 172 } 173 #endif 174 175 static void logOption(const char* opt) { 176 if (PrintVMOptions) { 177 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 178 } 179 } 180 181 // Process java launcher properties. 182 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 183 // See if sun.java.launcher or sun.java.launcher.pid is defined. 184 // Must do this before setting up other system properties, 185 // as some of them may depend on launcher type. 186 for (int index = 0; index < args->nOptions; index++) { 187 const JavaVMOption* option = args->options + index; 188 const char* tail; 189 190 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 191 process_java_launcher_argument(tail, option->extraInfo); 192 continue; 193 } 194 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 195 _sun_java_launcher_pid = atoi(tail); 196 continue; 197 } 198 } 199 } 200 201 // Initialize system properties key and value. 202 void Arguments::init_system_properties() { 203 204 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 205 "Java Virtual Machine Specification", false)); 206 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 207 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 208 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 209 210 // following are JVMTI agent writeable properties. 211 // Properties values are set to NULL and they are 212 // os specific they are initialized in os::init_system_properties_values(). 213 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 214 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 215 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 216 _java_library_path = new SystemProperty("java.library.path", NULL, true); 217 _java_home = new SystemProperty("java.home", NULL, true); 218 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 219 220 _java_class_path = new SystemProperty("java.class.path", "", true); 221 222 // Add to System Property list. 223 PropertyList_add(&_system_properties, _java_ext_dirs); 224 PropertyList_add(&_system_properties, _java_endorsed_dirs); 225 PropertyList_add(&_system_properties, _sun_boot_library_path); 226 PropertyList_add(&_system_properties, _java_library_path); 227 PropertyList_add(&_system_properties, _java_home); 228 PropertyList_add(&_system_properties, _java_class_path); 229 PropertyList_add(&_system_properties, _sun_boot_class_path); 230 231 // Set OS specific system properties values 232 os::init_system_properties_values(); 233 } 234 235 236 // Update/Initialize System properties after JDK version number is known 237 void Arguments::init_version_specific_system_properties() { 238 enum { bufsz = 16 }; 239 char buffer[bufsz]; 240 const char* spec_vendor = "Sun Microsystems Inc."; 241 uint32_t spec_version = 0; 242 243 if (JDK_Version::is_gte_jdk17x_version()) { 244 spec_vendor = "Oracle Corporation"; 245 spec_version = JDK_Version::current().major_version(); 246 } 247 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 248 249 PropertyList_add(&_system_properties, 250 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 251 PropertyList_add(&_system_properties, 252 new SystemProperty("java.vm.specification.version", buffer, false)); 253 PropertyList_add(&_system_properties, 254 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 255 } 256 257 /** 258 * Provide a slightly more user-friendly way of eliminating -XX flags. 259 * When a flag is eliminated, it can be added to this list in order to 260 * continue accepting this flag on the command-line, while issuing a warning 261 * and ignoring the value. Once the JDK version reaches the 'accept_until' 262 * limit, we flatly refuse to admit the existence of the flag. This allows 263 * a flag to die correctly over JDK releases using HSX. 264 */ 265 typedef struct { 266 const char* name; 267 JDK_Version obsoleted_in; // when the flag went away 268 JDK_Version accept_until; // which version to start denying the existence 269 } ObsoleteFlag; 270 271 static ObsoleteFlag obsolete_jvm_flags[] = { 272 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 273 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 274 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 275 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 276 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 277 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 278 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 279 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 280 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 281 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 282 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 283 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 284 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 285 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 286 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 287 { "DefaultInitialRAMFraction", 288 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 289 { "UseDepthFirstScavengeOrder", 290 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 291 { "HandlePromotionFailure", 292 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 293 { "MaxLiveObjectEvacuationRatio", 294 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 295 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 296 { "UseParallelOldGCCompacting", 297 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 298 { "UseParallelDensePrefixUpdate", 299 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 300 { "UseParallelOldGCDensePrefix", 301 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 302 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 303 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 304 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 305 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 306 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 307 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 308 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 309 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 310 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 311 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 312 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 313 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 314 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 315 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 316 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 317 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 318 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 319 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 320 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 321 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 322 { "UseOldInlining", JDK_Version::jdk_update(8, 20), JDK_Version::jdk(10) }, 323 { "AutoShutdownNMT", JDK_Version::jdk_update(8, 40), JDK_Version::jdk(10) }, 324 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 325 { "SegmentedHeapDumpThreshold", JDK_Version::jdk_update(8, 252), JDK_Version::jdk(10) }, 326 #ifdef PRODUCT 327 { "DesiredMethodLimit", 328 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 329 #endif // PRODUCT 330 { NULL, JDK_Version(0), JDK_Version(0) } 331 }; 332 333 // Returns true if the flag is obsolete and fits into the range specified 334 // for being ignored. In the case that the flag is ignored, the 'version' 335 // value is filled in with the version number when the flag became 336 // obsolete so that that value can be displayed to the user. 337 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 338 int i = 0; 339 assert(version != NULL, "Must provide a version buffer"); 340 while (obsolete_jvm_flags[i].name != NULL) { 341 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 342 // <flag>=xxx form 343 // [-|+]<flag> form 344 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 345 ((s[0] == '+' || s[0] == '-') && 346 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 347 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 348 *version = flag_status.obsoleted_in; 349 return true; 350 } 351 } 352 i++; 353 } 354 return false; 355 } 356 357 // Constructs the system class path (aka boot class path) from the following 358 // components, in order: 359 // 360 // prefix // from -Xbootclasspath/p:... 361 // endorsed // the expansion of -Djava.endorsed.dirs=... 362 // base // from os::get_system_properties() or -Xbootclasspath= 363 // suffix // from -Xbootclasspath/a:... 364 // 365 // java.endorsed.dirs is a list of directories; any jar or zip files in the 366 // directories are added to the sysclasspath just before the base. 367 // 368 // This could be AllStatic, but it isn't needed after argument processing is 369 // complete. 370 class SysClassPath: public StackObj { 371 public: 372 SysClassPath(const char* base); 373 ~SysClassPath(); 374 375 inline void set_base(const char* base); 376 inline void add_prefix(const char* prefix); 377 inline void add_suffix_to_prefix(const char* suffix); 378 inline void add_suffix(const char* suffix); 379 inline void reset_path(const char* base); 380 381 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 382 // property. Must be called after all command-line arguments have been 383 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 384 // combined_path(). 385 void expand_endorsed(); 386 387 inline const char* get_base() const { return _items[_scp_base]; } 388 inline const char* get_prefix() const { return _items[_scp_prefix]; } 389 inline const char* get_suffix() const { return _items[_scp_suffix]; } 390 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 391 392 // Combine all the components into a single c-heap-allocated string; caller 393 // must free the string if/when no longer needed. 394 char* combined_path(); 395 396 private: 397 // Utility routines. 398 static char* add_to_path(const char* path, const char* str, bool prepend); 399 static char* add_jars_to_path(char* path, const char* directory); 400 401 inline void reset_item_at(int index); 402 403 // Array indices for the items that make up the sysclasspath. All except the 404 // base are allocated in the C heap and freed by this class. 405 enum { 406 _scp_prefix, // from -Xbootclasspath/p:... 407 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 408 _scp_base, // the default sysclasspath 409 _scp_suffix, // from -Xbootclasspath/a:... 410 _scp_nitems // the number of items, must be last. 411 }; 412 413 const char* _items[_scp_nitems]; 414 DEBUG_ONLY(bool _expansion_done;) 415 }; 416 417 SysClassPath::SysClassPath(const char* base) { 418 memset(_items, 0, sizeof(_items)); 419 _items[_scp_base] = base; 420 DEBUG_ONLY(_expansion_done = false;) 421 } 422 423 SysClassPath::~SysClassPath() { 424 // Free everything except the base. 425 for (int i = 0; i < _scp_nitems; ++i) { 426 if (i != _scp_base) reset_item_at(i); 427 } 428 DEBUG_ONLY(_expansion_done = false;) 429 } 430 431 inline void SysClassPath::set_base(const char* base) { 432 _items[_scp_base] = base; 433 } 434 435 inline void SysClassPath::add_prefix(const char* prefix) { 436 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 437 } 438 439 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 440 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 441 } 442 443 inline void SysClassPath::add_suffix(const char* suffix) { 444 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 445 } 446 447 inline void SysClassPath::reset_item_at(int index) { 448 assert(index < _scp_nitems && index != _scp_base, "just checking"); 449 if (_items[index] != NULL) { 450 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 451 _items[index] = NULL; 452 } 453 } 454 455 inline void SysClassPath::reset_path(const char* base) { 456 // Clear the prefix and suffix. 457 reset_item_at(_scp_prefix); 458 reset_item_at(_scp_suffix); 459 set_base(base); 460 } 461 462 //------------------------------------------------------------------------------ 463 464 void SysClassPath::expand_endorsed() { 465 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 466 467 const char* path = Arguments::get_property("java.endorsed.dirs"); 468 if (path == NULL) { 469 path = Arguments::get_endorsed_dir(); 470 assert(path != NULL, "no default for java.endorsed.dirs"); 471 } 472 473 char* expanded_path = NULL; 474 const char separator = *os::path_separator(); 475 const char* const end = path + strlen(path); 476 while (path < end) { 477 const char* tmp_end = strchr(path, separator); 478 if (tmp_end == NULL) { 479 expanded_path = add_jars_to_path(expanded_path, path); 480 path = end; 481 } else { 482 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 483 memcpy(dirpath, path, tmp_end - path); 484 dirpath[tmp_end - path] = '\0'; 485 expanded_path = add_jars_to_path(expanded_path, dirpath); 486 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 487 path = tmp_end + 1; 488 } 489 } 490 _items[_scp_endorsed] = expanded_path; 491 DEBUG_ONLY(_expansion_done = true;) 492 } 493 494 // Combine the bootclasspath elements, some of which may be null, into a single 495 // c-heap-allocated string. 496 char* SysClassPath::combined_path() { 497 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 498 assert(_expansion_done, "must call expand_endorsed() first."); 499 500 size_t lengths[_scp_nitems]; 501 size_t total_len = 0; 502 503 const char separator = *os::path_separator(); 504 505 // Get the lengths. 506 int i; 507 for (i = 0; i < _scp_nitems; ++i) { 508 if (_items[i] != NULL) { 509 lengths[i] = strlen(_items[i]); 510 // Include space for the separator char (or a NULL for the last item). 511 total_len += lengths[i] + 1; 512 } 513 } 514 assert(total_len > 0, "empty sysclasspath not allowed"); 515 516 // Copy the _items to a single string. 517 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 518 char* cp_tmp = cp; 519 for (i = 0; i < _scp_nitems; ++i) { 520 if (_items[i] != NULL) { 521 memcpy(cp_tmp, _items[i], lengths[i]); 522 cp_tmp += lengths[i]; 523 *cp_tmp++ = separator; 524 } 525 } 526 *--cp_tmp = '\0'; // Replace the extra separator. 527 return cp; 528 } 529 530 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 531 char* 532 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 533 char *cp; 534 535 assert(str != NULL, "just checking"); 536 if (path == NULL) { 537 size_t len = strlen(str) + 1; 538 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 539 memcpy(cp, str, len); // copy the trailing null 540 } else { 541 const char separator = *os::path_separator(); 542 size_t old_len = strlen(path); 543 size_t str_len = strlen(str); 544 size_t len = old_len + str_len + 2; 545 546 if (prepend) { 547 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 548 char* cp_tmp = cp; 549 memcpy(cp_tmp, str, str_len); 550 cp_tmp += str_len; 551 *cp_tmp = separator; 552 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 553 FREE_C_HEAP_ARRAY(char, path, mtInternal); 554 } else { 555 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 556 char* cp_tmp = cp + old_len; 557 *cp_tmp = separator; 558 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 559 } 560 } 561 return cp; 562 } 563 564 // Scan the directory and append any jar or zip files found to path. 565 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 566 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 567 DIR* dir = os::opendir(directory); 568 if (dir == NULL) return path; 569 570 char dir_sep[2] = { '\0', '\0' }; 571 size_t directory_len = strlen(directory); 572 const char fileSep = *os::file_separator(); 573 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 574 575 /* Scan the directory for jars/zips, appending them to path. */ 576 struct dirent *entry; 577 while ((entry = os::readdir(dir)) != NULL) { 578 const char* name = entry->d_name; 579 const char* ext = name + strlen(name) - 4; 580 bool isJarOrZip = ext > name && 581 (os::file_name_strcmp(ext, ".jar") == 0 || 582 os::file_name_strcmp(ext, ".zip") == 0); 583 if (isJarOrZip) { 584 size_t length = directory_len + 2 + strlen(name); 585 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal); 586 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name); 587 path = add_to_path(path, jarpath, false); 588 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 589 } 590 } 591 os::closedir(dir); 592 return path; 593 } 594 595 // Parses a memory size specification string. 596 static bool atomull(const char *s, julong* result) { 597 julong n = 0; 598 int args_read = sscanf(s, JULONG_FORMAT, &n); 599 if (args_read != 1) { 600 return false; 601 } 602 while (*s != '\0' && isdigit(*s)) { 603 s++; 604 } 605 // 4705540: illegal if more characters are found after the first non-digit 606 if (strlen(s) > 1) { 607 return false; 608 } 609 switch (*s) { 610 case 'T': case 't': 611 *result = n * G * K; 612 // Check for overflow. 613 if (*result/((julong)G * K) != n) return false; 614 return true; 615 case 'G': case 'g': 616 *result = n * G; 617 if (*result/G != n) return false; 618 return true; 619 case 'M': case 'm': 620 *result = n * M; 621 if (*result/M != n) return false; 622 return true; 623 case 'K': case 'k': 624 *result = n * K; 625 if (*result/K != n) return false; 626 return true; 627 case '\0': 628 *result = n; 629 return true; 630 default: 631 return false; 632 } 633 } 634 635 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 636 if (size < min_size) return arg_too_small; 637 // Check that size will fit in a size_t (only relevant on 32-bit) 638 if (size > max_uintx) return arg_too_big; 639 return arg_in_range; 640 } 641 642 // Describe an argument out of range error 643 void Arguments::describe_range_error(ArgsRange errcode) { 644 switch(errcode) { 645 case arg_too_big: 646 jio_fprintf(defaultStream::error_stream(), 647 "The specified size exceeds the maximum " 648 "representable size.\n"); 649 break; 650 case arg_too_small: 651 case arg_unreadable: 652 case arg_in_range: 653 // do nothing for now 654 break; 655 default: 656 ShouldNotReachHere(); 657 } 658 } 659 660 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 661 return CommandLineFlags::boolAtPut(name, &value, origin); 662 } 663 664 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 665 double v; 666 if (sscanf(value, "%lf", &v) != 1) { 667 return false; 668 } 669 670 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 671 return true; 672 } 673 return false; 674 } 675 676 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 677 julong v; 678 intx intx_v; 679 bool is_neg = false; 680 // Check the sign first since atomull() parses only unsigned values. 681 if (*value == '-') { 682 if (!CommandLineFlags::intxAt(name, &intx_v)) { 683 return false; 684 } 685 value++; 686 is_neg = true; 687 } 688 if (!atomull(value, &v)) { 689 return false; 690 } 691 intx_v = (intx) v; 692 if (is_neg) { 693 intx_v = -intx_v; 694 } 695 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 696 return true; 697 } 698 uintx uintx_v = (uintx) v; 699 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 700 return true; 701 } 702 uint64_t uint64_t_v = (uint64_t) v; 703 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 704 return true; 705 } 706 return false; 707 } 708 709 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 710 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 711 // Contract: CommandLineFlags always returns a pointer that needs freeing. 712 FREE_C_HEAP_ARRAY(char, value, mtInternal); 713 return true; 714 } 715 716 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 717 const char* old_value = ""; 718 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 719 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 720 size_t new_len = strlen(new_value); 721 const char* value; 722 char* free_this_too = NULL; 723 if (old_len == 0) { 724 value = new_value; 725 } else if (new_len == 0) { 726 value = old_value; 727 } else { 728 size_t length = old_len + 1 + new_len + 1; 729 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal); 730 // each new setting adds another LINE to the switch: 731 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 732 value = buf; 733 free_this_too = buf; 734 } 735 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 736 // CommandLineFlags always returns a pointer that needs freeing. 737 FREE_C_HEAP_ARRAY(char, value, mtInternal); 738 if (free_this_too != NULL) { 739 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 740 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 741 } 742 return true; 743 } 744 745 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 746 747 // range of acceptable characters spelled out for portability reasons 748 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 749 #define BUFLEN 255 750 char name[BUFLEN+1]; 751 char dummy; 752 753 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 754 return set_bool_flag(name, false, origin); 755 } 756 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 757 return set_bool_flag(name, true, origin); 758 } 759 760 char punct; 761 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 762 const char* value = strchr(arg, '=') + 1; 763 Flag* flag = Flag::find_flag(name, strlen(name)); 764 if (flag != NULL && flag->is_ccstr()) { 765 if (flag->ccstr_accumulates()) { 766 return append_to_string_flag(name, value, origin); 767 } else { 768 if (value[0] == '\0') { 769 value = NULL; 770 } 771 return set_string_flag(name, value, origin); 772 } 773 } 774 } 775 776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 777 const char* value = strchr(arg, '=') + 1; 778 // -XX:Foo:=xxx will reset the string flag to the given value. 779 if (value[0] == '\0') { 780 value = NULL; 781 } 782 return set_string_flag(name, value, origin); 783 } 784 785 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 786 #define SIGNED_NUMBER_RANGE "[-0123456789]" 787 #define NUMBER_RANGE "[0123456789]" 788 char value[BUFLEN + 1]; 789 char value2[BUFLEN + 1]; 790 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 791 // Looks like a floating-point number -- try again with more lenient format string 792 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 793 return set_fp_numeric_flag(name, value, origin); 794 } 795 } 796 797 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 798 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 799 return set_numeric_flag(name, value, origin); 800 } 801 802 return false; 803 } 804 805 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 806 assert(bldarray != NULL, "illegal argument"); 807 808 if (arg == NULL) { 809 return; 810 } 811 812 int new_count = *count + 1; 813 814 // expand the array and add arg to the last element 815 if (*bldarray == NULL) { 816 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 817 } else { 818 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 819 } 820 (*bldarray)[*count] = strdup(arg); 821 *count = new_count; 822 } 823 824 void Arguments::build_jvm_args(const char* arg) { 825 add_string(&_jvm_args_array, &_num_jvm_args, arg); 826 } 827 828 void Arguments::build_jvm_flags(const char* arg) { 829 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 830 } 831 832 // utility function to return a string that concatenates all 833 // strings in a given char** array 834 const char* Arguments::build_resource_string(char** args, int count) { 835 if (args == NULL || count == 0) { 836 return NULL; 837 } 838 size_t length = 0; 839 for (int i = 0; i < count; i++) { 840 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 841 } 842 char* s = NEW_RESOURCE_ARRAY(char, length); 843 char* dst = s; 844 for (int j = 0; j < count; j++) { 845 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 846 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 847 dst += offset; 848 length -= offset; 849 } 850 return (const char*) s; 851 } 852 853 void Arguments::print_on(outputStream* st) { 854 st->print_cr("VM Arguments:"); 855 if (num_jvm_flags() > 0) { 856 st->print("jvm_flags: "); print_jvm_flags_on(st); 857 } 858 if (num_jvm_args() > 0) { 859 st->print("jvm_args: "); print_jvm_args_on(st); 860 } 861 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 862 if (_java_class_path != NULL) { 863 char* path = _java_class_path->value(); 864 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 865 } 866 st->print_cr("Launcher Type: %s", _sun_java_launcher); 867 } 868 869 void Arguments::print_jvm_flags_on(outputStream* st) { 870 if (_num_jvm_flags > 0) { 871 for (int i=0; i < _num_jvm_flags; i++) { 872 st->print("%s ", _jvm_flags_array[i]); 873 } 874 st->cr(); 875 } 876 } 877 878 void Arguments::print_jvm_args_on(outputStream* st) { 879 if (_num_jvm_args > 0) { 880 for (int i=0; i < _num_jvm_args; i++) { 881 st->print("%s ", _jvm_args_array[i]); 882 } 883 st->cr(); 884 } 885 } 886 887 bool Arguments::process_argument(const char* arg, 888 jboolean ignore_unrecognized, Flag::Flags origin) { 889 890 JDK_Version since = JDK_Version(); 891 892 if (parse_argument(arg, origin) || ignore_unrecognized) { 893 return true; 894 } 895 896 bool has_plus_minus = (*arg == '+' || *arg == '-'); 897 const char* const argname = has_plus_minus ? arg + 1 : arg; 898 if (is_newly_obsolete(arg, &since)) { 899 char version[256]; 900 since.to_string(version, sizeof(version)); 901 warning("ignoring option %s; support was removed in %s", argname, version); 902 return true; 903 } 904 905 // For locked flags, report a custom error message if available. 906 // Otherwise, report the standard unrecognized VM option. 907 908 size_t arg_len; 909 const char* equal_sign = strchr(argname, '='); 910 if (equal_sign == NULL) { 911 arg_len = strlen(argname); 912 } else { 913 arg_len = equal_sign - argname; 914 } 915 916 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 917 if (found_flag != NULL) { 918 char locked_message_buf[BUFLEN]; 919 found_flag->get_locked_message(locked_message_buf, BUFLEN); 920 if (strlen(locked_message_buf) == 0) { 921 if (found_flag->is_bool() && !has_plus_minus) { 922 jio_fprintf(defaultStream::error_stream(), 923 "Missing +/- setting for VM option '%s'\n", argname); 924 } else if (!found_flag->is_bool() && has_plus_minus) { 925 jio_fprintf(defaultStream::error_stream(), 926 "Unexpected +/- setting in VM option '%s'\n", argname); 927 } else { 928 jio_fprintf(defaultStream::error_stream(), 929 "Improperly specified VM option '%s'\n", argname); 930 } 931 } else { 932 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 933 } 934 } else { 935 jio_fprintf(defaultStream::error_stream(), 936 "Unrecognized VM option '%s'\n", argname); 937 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 938 if (fuzzy_matched != NULL) { 939 jio_fprintf(defaultStream::error_stream(), 940 "Did you mean '%s%s%s'?\n", 941 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 942 fuzzy_matched->_name, 943 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 944 } 945 } 946 947 // allow for commandline "commenting out" options like -XX:#+Verbose 948 return arg[0] == '#'; 949 } 950 951 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 952 FILE* stream = fopen(file_name, "rb"); 953 if (stream == NULL) { 954 if (should_exist) { 955 jio_fprintf(defaultStream::error_stream(), 956 "Could not open settings file %s\n", file_name); 957 return false; 958 } else { 959 return true; 960 } 961 } 962 963 char token[1024]; 964 int pos = 0; 965 966 bool in_white_space = true; 967 bool in_comment = false; 968 bool in_quote = false; 969 char quote_c = 0; 970 bool result = true; 971 972 int c = getc(stream); 973 while(c != EOF && pos < (int)(sizeof(token)-1)) { 974 if (in_white_space) { 975 if (in_comment) { 976 if (c == '\n') in_comment = false; 977 } else { 978 if (c == '#') in_comment = true; 979 else if (!isspace(c)) { 980 in_white_space = false; 981 token[pos++] = c; 982 } 983 } 984 } else { 985 if (c == '\n' || (!in_quote && isspace(c))) { 986 // token ends at newline, or at unquoted whitespace 987 // this allows a way to include spaces in string-valued options 988 token[pos] = '\0'; 989 logOption(token); 990 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 991 build_jvm_flags(token); 992 pos = 0; 993 in_white_space = true; 994 in_quote = false; 995 } else if (!in_quote && (c == '\'' || c == '"')) { 996 in_quote = true; 997 quote_c = c; 998 } else if (in_quote && (c == quote_c)) { 999 in_quote = false; 1000 } else { 1001 token[pos++] = c; 1002 } 1003 } 1004 c = getc(stream); 1005 } 1006 if (pos > 0) { 1007 token[pos] = '\0'; 1008 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1009 build_jvm_flags(token); 1010 } 1011 fclose(stream); 1012 return result; 1013 } 1014 1015 //============================================================================================================= 1016 // Parsing of properties (-D) 1017 1018 const char* Arguments::get_property(const char* key) { 1019 return PropertyList_get_value(system_properties(), key); 1020 } 1021 1022 bool Arguments::add_property(const char* prop) { 1023 const char* eq = strchr(prop, '='); 1024 char* key; 1025 // ns must be static--its address may be stored in a SystemProperty object. 1026 const static char ns[1] = {0}; 1027 char* value = (char *)ns; 1028 1029 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1030 key = AllocateHeap(key_len + 1, mtInternal); 1031 strncpy(key, prop, key_len); 1032 key[key_len] = '\0'; 1033 1034 if (eq != NULL) { 1035 size_t value_len = strlen(prop) - key_len - 1; 1036 value = AllocateHeap(value_len + 1, mtInternal); 1037 strncpy(value, &prop[key_len + 1], value_len + 1); 1038 } 1039 1040 if (strcmp(key, "java.compiler") == 0) { 1041 process_java_compiler_argument(value); 1042 FreeHeap(key); 1043 if (eq != NULL) { 1044 FreeHeap(value); 1045 } 1046 return true; 1047 } else if (strcmp(key, "sun.java.command") == 0) { 1048 _java_command = value; 1049 1050 // Record value in Arguments, but let it get passed to Java. 1051 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 1052 // launcher.pid property is private and is processed 1053 // in process_sun_java_launcher_properties(); 1054 // the sun.java.launcher property is passed on to the java application 1055 FreeHeap(key); 1056 if (eq != NULL) { 1057 FreeHeap(value); 1058 } 1059 return true; 1060 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1061 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1062 // its value without going through the property list or making a Java call. 1063 _java_vendor_url_bug = value; 1064 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1065 PropertyList_unique_add(&_system_properties, key, value, true); 1066 return true; 1067 } 1068 // Create new property and add at the end of the list 1069 PropertyList_unique_add(&_system_properties, key, value); 1070 return true; 1071 } 1072 1073 //=========================================================================================================== 1074 // Setting int/mixed/comp mode flags 1075 1076 void Arguments::set_mode_flags(Mode mode) { 1077 // Set up default values for all flags. 1078 // If you add a flag to any of the branches below, 1079 // add a default value for it here. 1080 set_java_compiler(false); 1081 _mode = mode; 1082 1083 // Ensure Agent_OnLoad has the correct initial values. 1084 // This may not be the final mode; mode may change later in onload phase. 1085 PropertyList_unique_add(&_system_properties, "java.vm.info", 1086 (char*)VM_Version::vm_info_string(), false); 1087 1088 UseInterpreter = true; 1089 UseCompiler = true; 1090 UseLoopCounter = true; 1091 1092 #ifndef ZERO 1093 // Turn these off for mixed and comp. Leave them on for Zero. 1094 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1095 UseFastAccessorMethods = (mode == _int); 1096 } 1097 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1098 UseFastEmptyMethods = (mode == _int); 1099 } 1100 #endif 1101 1102 // Default values may be platform/compiler dependent - 1103 // use the saved values 1104 ClipInlining = Arguments::_ClipInlining; 1105 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1106 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1107 BackgroundCompilation = Arguments::_BackgroundCompilation; 1108 1109 // Change from defaults based on mode 1110 switch (mode) { 1111 default: 1112 ShouldNotReachHere(); 1113 break; 1114 case _int: 1115 UseCompiler = false; 1116 UseLoopCounter = false; 1117 AlwaysCompileLoopMethods = false; 1118 UseOnStackReplacement = false; 1119 break; 1120 case _mixed: 1121 // same as default 1122 break; 1123 case _comp: 1124 UseInterpreter = false; 1125 BackgroundCompilation = false; 1126 ClipInlining = false; 1127 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1128 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1129 // compile a level 4 (C2) and then continue executing it. 1130 if (TieredCompilation) { 1131 Tier3InvokeNotifyFreqLog = 0; 1132 Tier4InvocationThreshold = 0; 1133 } 1134 break; 1135 } 1136 } 1137 1138 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1139 // Conflict: required to use shared spaces (-Xshare:on), but 1140 // incompatible command line options were chosen. 1141 1142 static void no_shared_spaces(const char* message) { 1143 if (RequireSharedSpaces) { 1144 jio_fprintf(defaultStream::error_stream(), 1145 "Class data sharing is inconsistent with other specified options.\n"); 1146 vm_exit_during_initialization("Unable to use shared archive.", message); 1147 } else { 1148 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1149 } 1150 } 1151 #endif 1152 1153 void Arguments::set_tiered_flags() { 1154 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1155 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1156 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1157 } 1158 if (CompilationPolicyChoice < 2) { 1159 vm_exit_during_initialization( 1160 "Incompatible compilation policy selected", NULL); 1161 } 1162 // Increase the code cache size - tiered compiles a lot more. 1163 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1164 #ifndef AARCH64 1165 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1166 #else 1167 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 1168 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1169 #endif 1170 } 1171 if (!UseInterpreter) { // -Xcomp 1172 Tier3InvokeNotifyFreqLog = 0; 1173 Tier4InvocationThreshold = 0; 1174 } 1175 } 1176 1177 /** 1178 * Returns the minimum number of compiler threads needed to run the JVM. The following 1179 * configurations are possible. 1180 * 1181 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1182 * compiler threads is 0. 1183 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1184 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1185 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1186 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1187 * C1 can be used, so the minimum number of compiler threads is 1. 1188 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1189 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1190 * the minimum number of compiler threads is 2. 1191 */ 1192 int Arguments::get_min_number_of_compiler_threads() { 1193 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1194 return 0; // case 1 1195 #else 1196 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1197 return 1; // case 2 or case 3 1198 } 1199 return 2; // case 4 (tiered) 1200 #endif 1201 } 1202 1203 #if INCLUDE_ALL_GCS 1204 static void disable_adaptive_size_policy(const char* collector_name) { 1205 if (UseAdaptiveSizePolicy) { 1206 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1207 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1208 collector_name); 1209 } 1210 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1211 } 1212 } 1213 1214 void Arguments::set_parnew_gc_flags() { 1215 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1216 "control point invariant"); 1217 assert(UseParNewGC, "Error"); 1218 1219 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1220 disable_adaptive_size_policy("UseParNewGC"); 1221 1222 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1223 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1224 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1225 } else if (ParallelGCThreads == 0) { 1226 jio_fprintf(defaultStream::error_stream(), 1227 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1228 vm_exit(1); 1229 } 1230 1231 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1232 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1233 // we set them to 1024 and 1024. 1234 // See CR 6362902. 1235 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1236 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1237 } 1238 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1239 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1240 } 1241 1242 // AlwaysTenure flag should make ParNew promote all at first collection. 1243 // See CR 6362902. 1244 if (AlwaysTenure) { 1245 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1246 } 1247 // When using compressed oops, we use local overflow stacks, 1248 // rather than using a global overflow list chained through 1249 // the klass word of the object's pre-image. 1250 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1251 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1252 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1253 } 1254 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1255 } 1256 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1257 } 1258 1259 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1260 // sparc/solaris for certain applications, but would gain from 1261 // further optimization and tuning efforts, and would almost 1262 // certainly gain from analysis of platform and environment. 1263 void Arguments::set_cms_and_parnew_gc_flags() { 1264 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1265 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1266 1267 // If we are using CMS, we prefer to UseParNewGC, 1268 // unless explicitly forbidden. 1269 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1270 FLAG_SET_ERGO(bool, UseParNewGC, true); 1271 } 1272 1273 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1274 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1275 1276 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1277 // as needed. 1278 if (UseParNewGC) { 1279 set_parnew_gc_flags(); 1280 } 1281 1282 size_t max_heap = align_size_down(MaxHeapSize, 1283 CardTableRS::ct_max_alignment_constraint()); 1284 1285 // Now make adjustments for CMS 1286 intx tenuring_default = (intx)6; 1287 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1288 1289 // Preferred young gen size for "short" pauses: 1290 // upper bound depends on # of threads and NewRatio. 1291 const uintx parallel_gc_threads = 1292 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1293 const size_t preferred_max_new_size_unaligned = 1294 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1295 size_t preferred_max_new_size = 1296 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1297 1298 // Unless explicitly requested otherwise, size young gen 1299 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1300 1301 // If either MaxNewSize or NewRatio is set on the command line, 1302 // assume the user is trying to set the size of the young gen. 1303 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1304 1305 // Set MaxNewSize to our calculated preferred_max_new_size unless 1306 // NewSize was set on the command line and it is larger than 1307 // preferred_max_new_size. 1308 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1309 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1310 } else { 1311 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1312 } 1313 if (PrintGCDetails && Verbose) { 1314 // Too early to use gclog_or_tty 1315 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1316 } 1317 1318 // Code along this path potentially sets NewSize and OldSize 1319 if (PrintGCDetails && Verbose) { 1320 // Too early to use gclog_or_tty 1321 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1322 " initial_heap_size: " SIZE_FORMAT 1323 " max_heap: " SIZE_FORMAT, 1324 min_heap_size(), InitialHeapSize, max_heap); 1325 } 1326 size_t min_new = preferred_max_new_size; 1327 if (FLAG_IS_CMDLINE(NewSize)) { 1328 min_new = NewSize; 1329 } 1330 if (max_heap > min_new && min_heap_size() > min_new) { 1331 // Unless explicitly requested otherwise, make young gen 1332 // at least min_new, and at most preferred_max_new_size. 1333 if (FLAG_IS_DEFAULT(NewSize)) { 1334 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1335 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1336 if (PrintGCDetails && Verbose) { 1337 // Too early to use gclog_or_tty 1338 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1339 } 1340 } 1341 // Unless explicitly requested otherwise, size old gen 1342 // so it's NewRatio x of NewSize. 1343 if (FLAG_IS_DEFAULT(OldSize)) { 1344 if (max_heap > NewSize) { 1345 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1346 if (PrintGCDetails && Verbose) { 1347 // Too early to use gclog_or_tty 1348 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1349 } 1350 } 1351 } 1352 } 1353 } 1354 // Unless explicitly requested otherwise, definitely 1355 // promote all objects surviving "tenuring_default" scavenges. 1356 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1357 FLAG_IS_DEFAULT(SurvivorRatio)) { 1358 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1359 } 1360 // If we decided above (or user explicitly requested) 1361 // `promote all' (via MaxTenuringThreshold := 0), 1362 // prefer minuscule survivor spaces so as not to waste 1363 // space for (non-existent) survivors 1364 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1365 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1366 } 1367 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1368 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1369 // This is done in order to make ParNew+CMS configuration to work 1370 // with YoungPLABSize and OldPLABSize options. 1371 // See CR 6362902. 1372 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1373 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1374 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1375 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1376 // the value (either from the command line or ergonomics) of 1377 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1378 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1379 } else { 1380 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1381 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1382 // we'll let it to take precedence. 1383 jio_fprintf(defaultStream::error_stream(), 1384 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1385 " options are specified for the CMS collector." 1386 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1387 } 1388 } 1389 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1390 // OldPLAB sizing manually turned off: Use a larger default setting, 1391 // unless it was manually specified. This is because a too-low value 1392 // will slow down scavenges. 1393 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1394 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1395 } 1396 } 1397 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1398 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1399 // If either of the static initialization defaults have changed, note this 1400 // modification. 1401 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1402 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1403 } 1404 1405 if (PrintGCDetails && Verbose) { 1406 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1407 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1408 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1409 } 1410 } 1411 #endif // INCLUDE_ALL_GCS 1412 1413 void set_object_alignment() { 1414 // Object alignment. 1415 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1416 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1417 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1418 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1419 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1420 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1421 1422 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1423 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1424 1425 // Oop encoding heap max 1426 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1427 1428 #if INCLUDE_ALL_GCS 1429 // Set CMS global values 1430 CompactibleFreeListSpace::set_cms_values(); 1431 #endif // INCLUDE_ALL_GCS 1432 } 1433 1434 bool verify_object_alignment() { 1435 // Object alignment. 1436 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1437 jio_fprintf(defaultStream::error_stream(), 1438 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1439 (int)ObjectAlignmentInBytes); 1440 return false; 1441 } 1442 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1443 jio_fprintf(defaultStream::error_stream(), 1444 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1445 (int)ObjectAlignmentInBytes, BytesPerLong); 1446 return false; 1447 } 1448 // It does not make sense to have big object alignment 1449 // since a space lost due to alignment will be greater 1450 // then a saved space from compressed oops. 1451 if ((int)ObjectAlignmentInBytes > 256) { 1452 jio_fprintf(defaultStream::error_stream(), 1453 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1454 (int)ObjectAlignmentInBytes); 1455 return false; 1456 } 1457 // In case page size is very small. 1458 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1459 jio_fprintf(defaultStream::error_stream(), 1460 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1461 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1462 return false; 1463 } 1464 if(SurvivorAlignmentInBytes == 0) { 1465 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1466 } else { 1467 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1468 jio_fprintf(defaultStream::error_stream(), 1469 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1470 (int)SurvivorAlignmentInBytes); 1471 return false; 1472 } 1473 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1474 jio_fprintf(defaultStream::error_stream(), 1475 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1476 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1477 return false; 1478 } 1479 } 1480 return true; 1481 } 1482 1483 size_t Arguments::max_heap_for_compressed_oops() { 1484 // Avoid sign flip. 1485 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1486 // We need to fit both the NULL page and the heap into the memory budget, while 1487 // keeping alignment constraints of the heap. To guarantee the latter, as the 1488 // NULL page is located before the heap, we pad the NULL page to the conservative 1489 // maximum alignment that the GC may ever impose upon the heap. 1490 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1491 _conservative_max_heap_alignment); 1492 1493 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1494 NOT_LP64(ShouldNotReachHere(); return 0); 1495 } 1496 1497 bool Arguments::should_auto_select_low_pause_collector() { 1498 if (UseAutoGCSelectPolicy && 1499 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1500 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1501 if (PrintGCDetails) { 1502 // Cannot use gclog_or_tty yet. 1503 tty->print_cr("Automatic selection of the low pause collector" 1504 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1505 } 1506 return true; 1507 } 1508 return false; 1509 } 1510 1511 void Arguments::set_use_compressed_oops() { 1512 #ifndef ZERO 1513 #ifdef _LP64 1514 // MaxHeapSize is not set up properly at this point, but 1515 // the only value that can override MaxHeapSize if we are 1516 // to use UseCompressedOops is InitialHeapSize. 1517 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1518 1519 if (max_heap_size <= max_heap_for_compressed_oops()) { 1520 #if !defined(COMPILER1) || defined(TIERED) 1521 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1522 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1523 } 1524 #endif 1525 #ifdef _WIN64 1526 if (UseLargePages && UseCompressedOops) { 1527 // Cannot allocate guard pages for implicit checks in indexed addressing 1528 // mode, when large pages are specified on windows. 1529 // This flag could be switched ON if narrow oop base address is set to 0, 1530 // see code in Universe::initialize_heap(). 1531 Universe::set_narrow_oop_use_implicit_null_checks(false); 1532 } 1533 #endif // _WIN64 1534 } else { 1535 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1536 warning("Max heap size too large for Compressed Oops"); 1537 FLAG_SET_DEFAULT(UseCompressedOops, false); 1538 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1539 } 1540 } 1541 #endif // _LP64 1542 #endif // ZERO 1543 } 1544 1545 1546 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1547 // set_use_compressed_oops(). 1548 void Arguments::set_use_compressed_klass_ptrs() { 1549 #ifndef ZERO 1550 #ifdef _LP64 1551 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1552 if (!UseCompressedOops) { 1553 if (UseCompressedClassPointers) { 1554 warning("UseCompressedClassPointers requires UseCompressedOops"); 1555 } 1556 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1557 } else { 1558 // Turn on UseCompressedClassPointers too 1559 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1560 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1561 } 1562 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1563 if (UseCompressedClassPointers) { 1564 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1565 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1566 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1567 } 1568 } 1569 } 1570 #endif // _LP64 1571 #endif // !ZERO 1572 } 1573 1574 void Arguments::set_conservative_max_heap_alignment() { 1575 // The conservative maximum required alignment for the heap is the maximum of 1576 // the alignments imposed by several sources: any requirements from the heap 1577 // itself, the collector policy and the maximum page size we may run the VM 1578 // with. 1579 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1580 #if INCLUDE_ALL_GCS 1581 if (UseParallelGC) { 1582 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1583 } else if (UseG1GC) { 1584 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1585 } 1586 #endif // INCLUDE_ALL_GCS 1587 _conservative_max_heap_alignment = MAX4(heap_alignment, 1588 (size_t)os::vm_allocation_granularity(), 1589 os::max_page_size(), 1590 CollectorPolicy::compute_heap_alignment()); 1591 } 1592 1593 void Arguments::select_gc_ergonomically() { 1594 if (os::is_server_class_machine()) { 1595 if (should_auto_select_low_pause_collector()) { 1596 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1597 } else { 1598 FLAG_SET_ERGO(bool, UseParallelGC, true); 1599 } 1600 } 1601 } 1602 1603 void Arguments::select_gc() { 1604 if (!gc_selected()) { 1605 select_gc_ergonomically(); 1606 } 1607 } 1608 1609 void Arguments::set_ergonomics_flags() { 1610 select_gc(); 1611 1612 #ifdef COMPILER2 1613 // Shared spaces work fine with other GCs but causes bytecode rewriting 1614 // to be disabled, which hurts interpreter performance and decreases 1615 // server performance. When -server is specified, keep the default off 1616 // unless it is asked for. Future work: either add bytecode rewriting 1617 // at link time, or rewrite bytecodes in non-shared methods. 1618 if (!DumpSharedSpaces && !RequireSharedSpaces && 1619 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1620 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1621 } 1622 #endif 1623 1624 set_conservative_max_heap_alignment(); 1625 1626 #ifndef ZERO 1627 #ifdef _LP64 1628 set_use_compressed_oops(); 1629 1630 // set_use_compressed_klass_ptrs() must be called after calling 1631 // set_use_compressed_oops(). 1632 set_use_compressed_klass_ptrs(); 1633 1634 // Also checks that certain machines are slower with compressed oops 1635 // in vm_version initialization code. 1636 #endif // _LP64 1637 #endif // !ZERO 1638 } 1639 1640 void Arguments::set_parallel_gc_flags() { 1641 assert(UseParallelGC || UseParallelOldGC, "Error"); 1642 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1643 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1644 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1645 } 1646 FLAG_SET_DEFAULT(UseParallelGC, true); 1647 1648 // If no heap maximum was requested explicitly, use some reasonable fraction 1649 // of the physical memory, up to a maximum of 1GB. 1650 FLAG_SET_DEFAULT(ParallelGCThreads, 1651 Abstract_VM_Version::parallel_worker_threads()); 1652 if (ParallelGCThreads == 0) { 1653 jio_fprintf(defaultStream::error_stream(), 1654 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1655 vm_exit(1); 1656 } 1657 1658 if (UseAdaptiveSizePolicy) { 1659 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1660 // unless the user actually sets these flags. 1661 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1662 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1663 _min_heap_free_ratio = MinHeapFreeRatio; 1664 } 1665 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1666 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1667 _max_heap_free_ratio = MaxHeapFreeRatio; 1668 } 1669 } 1670 1671 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1672 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1673 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1674 // See CR 6362902 for details. 1675 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1676 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1677 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1678 } 1679 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1680 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1681 } 1682 } 1683 1684 if (UseParallelOldGC) { 1685 // Par compact uses lower default values since they are treated as 1686 // minimums. These are different defaults because of the different 1687 // interpretation and are not ergonomically set. 1688 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1689 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1690 } 1691 } 1692 } 1693 1694 void Arguments::set_g1_gc_flags() { 1695 assert(UseG1GC, "Error"); 1696 #ifdef COMPILER1 1697 FastTLABRefill = false; 1698 #endif 1699 FLAG_SET_DEFAULT(ParallelGCThreads, 1700 Abstract_VM_Version::parallel_worker_threads()); 1701 if (ParallelGCThreads == 0) { 1702 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1703 } 1704 1705 #if INCLUDE_ALL_GCS 1706 if (G1ConcRefinementThreads == 0) { 1707 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1708 } 1709 #endif 1710 1711 // MarkStackSize will be set (if it hasn't been set by the user) 1712 // when concurrent marking is initialized. 1713 // Its value will be based upon the number of parallel marking threads. 1714 // But we do set the maximum mark stack size here. 1715 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1716 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1717 } 1718 1719 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1720 // In G1, we want the default GC overhead goal to be higher than 1721 // say in PS. So we set it here to 10%. Otherwise the heap might 1722 // be expanded more aggressively than we would like it to. In 1723 // fact, even 10% seems to not be high enough in some cases 1724 // (especially small GC stress tests that the main thing they do 1725 // is allocation). We might consider increase it further. 1726 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1727 } 1728 1729 if (PrintGCDetails && Verbose) { 1730 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1731 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1732 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1733 } 1734 } 1735 1736 #if !INCLUDE_ALL_GCS 1737 #ifdef ASSERT 1738 static bool verify_serial_gc_flags() { 1739 return (UseSerialGC && 1740 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1741 UseParallelGC || UseParallelOldGC)); 1742 } 1743 #endif // ASSERT 1744 #endif // INCLUDE_ALL_GCS 1745 1746 void Arguments::set_gc_specific_flags() { 1747 #if INCLUDE_ALL_GCS 1748 // Set per-collector flags 1749 if (UseParallelGC || UseParallelOldGC) { 1750 set_parallel_gc_flags(); 1751 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 1752 set_cms_and_parnew_gc_flags(); 1753 } else if (UseParNewGC) { // Skipped if CMS is set above 1754 set_parnew_gc_flags(); 1755 } else if (UseG1GC) { 1756 set_g1_gc_flags(); 1757 } 1758 check_deprecated_gcs(); 1759 check_deprecated_gc_flags(); 1760 if (AssumeMP && !UseSerialGC) { 1761 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1762 warning("If the number of processors is expected to increase from one, then" 1763 " you should configure the number of parallel GC threads appropriately" 1764 " using -XX:ParallelGCThreads=N"); 1765 } 1766 } 1767 if (MinHeapFreeRatio == 100) { 1768 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1769 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1770 } 1771 1772 // If class unloading is disabled, also disable concurrent class unloading. 1773 if (!ClassUnloading) { 1774 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1775 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 1776 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1777 } 1778 #else // INCLUDE_ALL_GCS 1779 assert(verify_serial_gc_flags(), "SerialGC unset"); 1780 #endif // INCLUDE_ALL_GCS 1781 } 1782 1783 julong Arguments::limit_by_allocatable_memory(julong limit) { 1784 julong max_allocatable; 1785 julong result = limit; 1786 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1787 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1788 } 1789 return result; 1790 } 1791 1792 void Arguments::set_heap_size() { 1793 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1794 // Deprecated flag 1795 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1796 } 1797 1798 julong phys_mem = 1799 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1800 : (julong)MaxRAM; 1801 1802 // Experimental support for CGroup memory limits 1803 if (UseCGroupMemoryLimitForHeap) { 1804 // This is a rough indicator that a CGroup limit may be in force 1805 // for this process 1806 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 1807 FILE *fp = fopen(lim_file, "r"); 1808 if (fp != NULL) { 1809 julong cgroup_max = 0; 1810 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 1811 if (ret == 1 && cgroup_max > 0) { 1812 // If unlimited, cgroup_max will be a very large, but unspecified 1813 // value, so use initial phys_mem as a limit 1814 if (PrintGCDetails && Verbose) { 1815 // Cannot use gclog_or_tty yet. 1816 tty->print_cr("Setting phys_mem to the min of cgroup limit (" 1817 JULONG_FORMAT "MB) and initial phys_mem (" 1818 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 1819 } 1820 phys_mem = MIN2(cgroup_max, phys_mem); 1821 } else { 1822 warning("Unable to read/parse cgroup memory limit from %s: %s", 1823 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 1824 } 1825 fclose(fp); 1826 } else { 1827 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 1828 } 1829 } 1830 1831 // Convert Fraction to Precentage values 1832 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1833 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1834 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1835 1836 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1837 !FLAG_IS_DEFAULT(MinRAMFraction)) 1838 MinRAMPercentage = 100.0 / MinRAMFraction; 1839 1840 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1841 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1842 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1843 1844 // If the maximum heap size has not been set with -Xmx, 1845 // then set it as fraction of the size of physical memory, 1846 // respecting the maximum and minimum sizes of the heap. 1847 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1848 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1849 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1850 if (reasonable_min < MaxHeapSize) { 1851 // Small physical memory, so use a minimum fraction of it for the heap 1852 reasonable_max = reasonable_min; 1853 } else { 1854 // Not-small physical memory, so require a heap at least 1855 // as large as MaxHeapSize 1856 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1857 } 1858 1859 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1860 // Limit the heap size to ErgoHeapSizeLimit 1861 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1862 } 1863 if (UseCompressedOops) { 1864 // Limit the heap size to the maximum possible when using compressed oops 1865 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1866 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1867 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1868 // but it should be not less than default MaxHeapSize. 1869 max_coop_heap -= HeapBaseMinAddress; 1870 } 1871 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1872 } 1873 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1874 1875 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1876 // An initial heap size was specified on the command line, 1877 // so be sure that the maximum size is consistent. Done 1878 // after call to limit_by_allocatable_memory because that 1879 // method might reduce the allocation size. 1880 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1881 } 1882 1883 if (PrintGCDetails && Verbose) { 1884 // Cannot use gclog_or_tty yet. 1885 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1886 } 1887 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1888 } 1889 1890 // If the minimum or initial heap_size have not been set or requested to be set 1891 // ergonomically, set them accordingly. 1892 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1893 julong reasonable_minimum = (julong)(OldSize + NewSize); 1894 1895 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1896 1897 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1898 1899 if (InitialHeapSize == 0) { 1900 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1901 1902 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1903 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1904 1905 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1906 1907 if (PrintGCDetails && Verbose) { 1908 // Cannot use gclog_or_tty yet. 1909 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1910 } 1911 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1912 } 1913 // If the minimum heap size has not been set (via -Xms), 1914 // synchronize with InitialHeapSize to avoid errors with the default value. 1915 if (min_heap_size() == 0) { 1916 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1917 if (PrintGCDetails && Verbose) { 1918 // Cannot use gclog_or_tty yet. 1919 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1920 } 1921 } 1922 } 1923 } 1924 1925 // This option inspects the machine and attempts to set various 1926 // parameters to be optimal for long-running, memory allocation 1927 // intensive jobs. It is intended for machines with large 1928 // amounts of cpu and memory. 1929 jint Arguments::set_aggressive_heap_flags() { 1930 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1931 // VM, but we may not be able to represent the total physical memory 1932 // available (like having 8gb of memory on a box but using a 32bit VM). 1933 // Thus, we need to make sure we're using a julong for intermediate 1934 // calculations. 1935 julong initHeapSize; 1936 julong total_memory = os::physical_memory(); 1937 1938 if (total_memory < (julong) 256 * M) { 1939 jio_fprintf(defaultStream::error_stream(), 1940 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1941 vm_exit(1); 1942 } 1943 1944 // The heap size is half of available memory, or (at most) 1945 // all of possible memory less 160mb (leaving room for the OS 1946 // when using ISM). This is the maximum; because adaptive sizing 1947 // is turned on below, the actual space used may be smaller. 1948 1949 initHeapSize = MIN2(total_memory / (julong) 2, 1950 total_memory - (julong) 160 * M); 1951 1952 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1953 1954 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1955 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 1956 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 1957 // Currently the minimum size and the initial heap sizes are the same. 1958 set_min_heap_size(initHeapSize); 1959 } 1960 if (FLAG_IS_DEFAULT(NewSize)) { 1961 // Make the young generation 3/8ths of the total heap. 1962 FLAG_SET_CMDLINE(uintx, NewSize, 1963 ((julong) MaxHeapSize / (julong) 8) * (julong) 3); 1964 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 1965 } 1966 1967 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 1968 FLAG_SET_DEFAULT(UseLargePages, true); 1969 #endif 1970 1971 // Increase some data structure sizes for efficiency 1972 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 1973 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 1974 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K); 1975 1976 // See the OldPLABSize comment below, but replace 'after promotion' 1977 // with 'after copying'. YoungPLABSize is the size of the survivor 1978 // space per-gc-thread buffers. The default is 4kw. 1979 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words 1980 1981 // OldPLABSize is the size of the buffers in the old gen that 1982 // UseParallelGC uses to promote live data that doesn't fit in the 1983 // survivor spaces. At any given time, there's one for each gc thread. 1984 // The default size is 1kw. These buffers are rarely used, since the 1985 // survivor spaces are usually big enough. For specjbb, however, there 1986 // are occasions when there's lots of live data in the young gen 1987 // and we end up promoting some of it. We don't have a definite 1988 // explanation for why bumping OldPLABSize helps, but the theory 1989 // is that a bigger PLAB results in retaining something like the 1990 // original allocation order after promotion, which improves mutator 1991 // locality. A minor effect may be that larger PLABs reduce the 1992 // number of PLAB allocation events during gc. The value of 8kw 1993 // was arrived at by experimenting with specjbb. 1994 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words 1995 1996 // Enable parallel GC and adaptive generation sizing 1997 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 1998 1999 // Encourage steady state memory management 2000 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2001 2002 // This appears to improve mutator locality 2003 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2004 2005 // Get around early Solaris scheduling bug 2006 // (affinity vs other jobs on system) 2007 // but disallow DR and offlining (5008695). 2008 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2009 2010 return JNI_OK; 2011 } 2012 2013 // This must be called after ergonomics because we want bytecode rewriting 2014 // if the server compiler is used, or if UseSharedSpaces is disabled. 2015 void Arguments::set_bytecode_flags() { 2016 // Better not attempt to store into a read-only space. 2017 if (UseSharedSpaces) { 2018 FLAG_SET_DEFAULT(RewriteBytecodes, false); 2019 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2020 } 2021 2022 if (!RewriteBytecodes) { 2023 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2024 } 2025 } 2026 2027 // Aggressive optimization flags -XX:+AggressiveOpts 2028 void Arguments::set_aggressive_opts_flags() { 2029 #ifdef COMPILER2 2030 if (AggressiveUnboxing) { 2031 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2032 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2033 } else if (!EliminateAutoBox) { 2034 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2035 AggressiveUnboxing = false; 2036 } 2037 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2038 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2039 } else if (!DoEscapeAnalysis) { 2040 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2041 AggressiveUnboxing = false; 2042 } 2043 } 2044 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2045 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2046 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2047 } 2048 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2049 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2050 } 2051 2052 // Feed the cache size setting into the JDK 2053 char buffer[1024]; 2054 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2055 add_property(buffer); 2056 } 2057 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2058 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2059 } 2060 #endif 2061 2062 if (AggressiveOpts) { 2063 // Sample flag setting code 2064 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2065 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2066 // } 2067 } 2068 } 2069 2070 //=========================================================================================================== 2071 // Parsing of java.compiler property 2072 2073 void Arguments::process_java_compiler_argument(char* arg) { 2074 // For backwards compatibility, Djava.compiler=NONE or "" 2075 // causes us to switch to -Xint mode UNLESS -Xdebug 2076 // is also specified. 2077 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2078 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2079 } 2080 } 2081 2082 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2083 _sun_java_launcher = strdup(launcher); 2084 if (strcmp("gamma", _sun_java_launcher) == 0) { 2085 _created_by_gamma_launcher = true; 2086 } 2087 } 2088 2089 bool Arguments::created_by_java_launcher() { 2090 assert(_sun_java_launcher != NULL, "property must have value"); 2091 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2092 } 2093 2094 bool Arguments::created_by_gamma_launcher() { 2095 return _created_by_gamma_launcher; 2096 } 2097 2098 //=========================================================================================================== 2099 // Parsing of main arguments 2100 2101 bool Arguments::verify_interval(uintx val, uintx min, 2102 uintx max, const char* name) { 2103 // Returns true iff value is in the inclusive interval [min..max] 2104 // false, otherwise. 2105 if (val >= min && val <= max) { 2106 return true; 2107 } 2108 jio_fprintf(defaultStream::error_stream(), 2109 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 2110 " and " UINTX_FORMAT "\n", 2111 name, val, min, max); 2112 return false; 2113 } 2114 2115 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 2116 // Returns true if given value is at least specified min threshold 2117 // false, otherwise. 2118 if (val >= min ) { 2119 return true; 2120 } 2121 jio_fprintf(defaultStream::error_stream(), 2122 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 2123 name, val, min); 2124 return false; 2125 } 2126 2127 bool Arguments::verify_percentage(uintx value, const char* name) { 2128 if (is_percentage(value)) { 2129 return true; 2130 } 2131 jio_fprintf(defaultStream::error_stream(), 2132 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2133 name, value); 2134 return false; 2135 } 2136 2137 // check if do gclog rotation 2138 // +UseGCLogFileRotation is a must, 2139 // no gc log rotation when log file not supplied or 2140 // NumberOfGCLogFiles is 0 2141 void check_gclog_consistency() { 2142 if (UseGCLogFileRotation) { 2143 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2144 jio_fprintf(defaultStream::output_stream(), 2145 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2146 "where num_of_file > 0\n" 2147 "GC log rotation is turned off\n"); 2148 UseGCLogFileRotation = false; 2149 } 2150 } 2151 2152 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2153 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2154 jio_fprintf(defaultStream::output_stream(), 2155 "GCLogFileSize changed to minimum 8K\n"); 2156 } 2157 } 2158 2159 // This function is called for -Xloggc:<filename>, it can be used 2160 // to check if a given file name(or string) conforms to the following 2161 // specification: 2162 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2163 // %p and %t only allowed once. We only limit usage of filename not path 2164 bool is_filename_valid(const char *file_name) { 2165 const char* p = file_name; 2166 char file_sep = os::file_separator()[0]; 2167 const char* cp; 2168 // skip prefix path 2169 for (cp = file_name; *cp != '\0'; cp++) { 2170 if (*cp == '/' || *cp == file_sep) { 2171 p = cp + 1; 2172 } 2173 } 2174 2175 int count_p = 0; 2176 int count_t = 0; 2177 while (*p != '\0') { 2178 if ((*p >= '0' && *p <= '9') || 2179 (*p >= 'A' && *p <= 'Z') || 2180 (*p >= 'a' && *p <= 'z') || 2181 *p == '-' || 2182 *p == '_' || 2183 *p == '.') { 2184 p++; 2185 continue; 2186 } 2187 if (*p == '%') { 2188 if(*(p + 1) == 'p') { 2189 p += 2; 2190 count_p ++; 2191 continue; 2192 } 2193 if (*(p + 1) == 't') { 2194 p += 2; 2195 count_t ++; 2196 continue; 2197 } 2198 } 2199 return false; 2200 } 2201 return count_p < 2 && count_t < 2; 2202 } 2203 2204 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2205 if (!is_percentage(min_heap_free_ratio)) { 2206 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2207 return false; 2208 } 2209 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2210 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2211 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2212 MaxHeapFreeRatio); 2213 return false; 2214 } 2215 // This does not set the flag itself, but stores the value in a safe place for later usage. 2216 _min_heap_free_ratio = min_heap_free_ratio; 2217 return true; 2218 } 2219 2220 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2221 if (!is_percentage(max_heap_free_ratio)) { 2222 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2223 return false; 2224 } 2225 if (max_heap_free_ratio < MinHeapFreeRatio) { 2226 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2227 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2228 MinHeapFreeRatio); 2229 return false; 2230 } 2231 // This does not set the flag itself, but stores the value in a safe place for later usage. 2232 _max_heap_free_ratio = max_heap_free_ratio; 2233 return true; 2234 } 2235 2236 // Check consistency of GC selection 2237 bool Arguments::check_gc_consistency() { 2238 check_gclog_consistency(); 2239 bool status = true; 2240 // Ensure that the user has not selected conflicting sets 2241 // of collectors. [Note: this check is merely a user convenience; 2242 // collectors over-ride each other so that only a non-conflicting 2243 // set is selected; however what the user gets is not what they 2244 // may have expected from the combination they asked for. It's 2245 // better to reduce user confusion by not allowing them to 2246 // select conflicting combinations. 2247 uint i = 0; 2248 if (UseSerialGC) i++; 2249 if (UseConcMarkSweepGC || UseParNewGC) i++; 2250 if (UseParallelGC || UseParallelOldGC) i++; 2251 if (UseG1GC) i++; 2252 if (i > 1) { 2253 jio_fprintf(defaultStream::error_stream(), 2254 "Conflicting collector combinations in option list; " 2255 "please refer to the release notes for the combinations " 2256 "allowed\n"); 2257 status = false; 2258 } 2259 return status; 2260 } 2261 2262 void Arguments::check_deprecated_gcs() { 2263 if (UseConcMarkSweepGC && !UseParNewGC) { 2264 warning("Using the DefNew young collector with the CMS collector is deprecated " 2265 "and will likely be removed in a future release"); 2266 } 2267 2268 if (UseParNewGC && !UseConcMarkSweepGC) { 2269 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2270 // set up UseSerialGC properly, so that can't be used in the check here. 2271 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2272 "and will likely be removed in a future release"); 2273 } 2274 2275 if (CMSIncrementalMode) { 2276 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2277 } 2278 } 2279 2280 void Arguments::check_deprecated_gc_flags() { 2281 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2282 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2283 "and will likely be removed in future release"); 2284 } 2285 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2286 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2287 "Use MaxRAMFraction instead."); 2288 } 2289 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2290 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2291 } 2292 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2293 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2294 } 2295 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2296 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2297 } 2298 } 2299 2300 // Check stack pages settings 2301 bool Arguments::check_stack_pages() 2302 { 2303 bool status = true; 2304 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2305 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2306 // greater stack shadow pages can't generate instruction to bang stack 2307 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2308 return status; 2309 } 2310 2311 // Check the consistency of vm_init_args 2312 bool Arguments::check_vm_args_consistency() { 2313 // Method for adding checks for flag consistency. 2314 // The intent is to warn the user of all possible conflicts, 2315 // before returning an error. 2316 // Note: Needs platform-dependent factoring. 2317 bool status = true; 2318 2319 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 2320 // builds so the cost of stack banging can be measured. 2321 #if (defined(PRODUCT) && defined(SOLARIS)) 2322 if (!UseBoundThreads && !UseStackBanging) { 2323 jio_fprintf(defaultStream::error_stream(), 2324 "-UseStackBanging conflicts with -UseBoundThreads\n"); 2325 2326 status = false; 2327 } 2328 #endif 2329 2330 if (TLABRefillWasteFraction == 0) { 2331 jio_fprintf(defaultStream::error_stream(), 2332 "TLABRefillWasteFraction should be a denominator, " 2333 "not " SIZE_FORMAT "\n", 2334 TLABRefillWasteFraction); 2335 status = false; 2336 } 2337 2338 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2339 "AdaptiveSizePolicyWeight"); 2340 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2341 2342 // Divide by bucket size to prevent a large size from causing rollover when 2343 // calculating amount of memory needed to be allocated for the String table. 2344 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2345 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2346 2347 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2348 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2349 2350 { 2351 // Using "else if" below to avoid printing two error messages if min > max. 2352 // This will also prevent us from reporting both min>100 and max>100 at the 2353 // same time, but that is less annoying than printing two identical errors IMHO. 2354 FormatBuffer<80> err_msg("%s",""); 2355 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2356 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2357 status = false; 2358 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2359 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2360 status = false; 2361 } 2362 } 2363 2364 // Min/MaxMetaspaceFreeRatio 2365 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2366 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2367 2368 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2369 jio_fprintf(defaultStream::error_stream(), 2370 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2371 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2372 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2373 MinMetaspaceFreeRatio, 2374 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2375 MaxMetaspaceFreeRatio); 2376 status = false; 2377 } 2378 2379 // Trying to keep 100% free is not practical 2380 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2381 2382 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2383 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2384 } 2385 2386 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2387 // Settings to encourage splitting. 2388 if (!FLAG_IS_CMDLINE(NewRatio)) { 2389 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2390 } 2391 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2392 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2393 } 2394 } 2395 2396 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2397 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2398 if (GCTimeLimit == 100) { 2399 // Turn off gc-overhead-limit-exceeded checks 2400 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2401 } 2402 2403 status = status && check_gc_consistency(); 2404 status = status && check_stack_pages(); 2405 2406 if (CMSIncrementalMode) { 2407 if (!UseConcMarkSweepGC) { 2408 jio_fprintf(defaultStream::error_stream(), 2409 "error: invalid argument combination.\n" 2410 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2411 "selected in order\nto use CMSIncrementalMode.\n"); 2412 status = false; 2413 } else { 2414 status = status && verify_percentage(CMSIncrementalDutyCycle, 2415 "CMSIncrementalDutyCycle"); 2416 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2417 "CMSIncrementalDutyCycleMin"); 2418 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2419 "CMSIncrementalSafetyFactor"); 2420 status = status && verify_percentage(CMSIncrementalOffset, 2421 "CMSIncrementalOffset"); 2422 status = status && verify_percentage(CMSExpAvgFactor, 2423 "CMSExpAvgFactor"); 2424 // If it was not set on the command line, set 2425 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2426 if (CMSInitiatingOccupancyFraction < 0) { 2427 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2428 } 2429 } 2430 } 2431 2432 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2433 // insists that we hold the requisite locks so that the iteration is 2434 // MT-safe. For the verification at start-up and shut-down, we don't 2435 // yet have a good way of acquiring and releasing these locks, 2436 // which are not visible at the CollectedHeap level. We want to 2437 // be able to acquire these locks and then do the iteration rather 2438 // than just disable the lock verification. This will be fixed under 2439 // bug 4788986. 2440 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2441 if (VerifyDuringStartup) { 2442 warning("Heap verification at start-up disabled " 2443 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2444 VerifyDuringStartup = false; // Disable verification at start-up 2445 } 2446 2447 if (VerifyBeforeExit) { 2448 warning("Heap verification at shutdown disabled " 2449 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2450 VerifyBeforeExit = false; // Disable verification at shutdown 2451 } 2452 } 2453 2454 // Note: only executed in non-PRODUCT mode 2455 if (!UseAsyncConcMarkSweepGC && 2456 (ExplicitGCInvokesConcurrent || 2457 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2458 jio_fprintf(defaultStream::error_stream(), 2459 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2460 " with -UseAsyncConcMarkSweepGC"); 2461 status = false; 2462 } 2463 2464 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2465 2466 #if INCLUDE_ALL_GCS 2467 if (UseG1GC) { 2468 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2469 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2470 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2471 2472 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2473 "InitiatingHeapOccupancyPercent"); 2474 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2475 "G1RefProcDrainInterval"); 2476 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2477 "G1ConcMarkStepDurationMillis"); 2478 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2479 "G1ConcRSHotCardLimit"); 2480 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27, 2481 "G1ConcRSLogCacheSize"); 2482 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2483 "StringDeduplicationAgeThreshold"); 2484 } 2485 if (UseConcMarkSweepGC) { 2486 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2487 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2488 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2489 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2490 2491 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2492 2493 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2494 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2495 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2496 2497 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2498 2499 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2500 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2501 2502 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2503 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2504 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2505 2506 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2507 2508 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2509 2510 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2511 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2512 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2513 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2514 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2515 } 2516 2517 if (UseParallelGC || UseParallelOldGC) { 2518 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2519 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2520 2521 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2522 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2523 2524 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2525 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2526 2527 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2528 2529 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2530 } 2531 #endif // INCLUDE_ALL_GCS 2532 2533 status = status && verify_interval(RefDiscoveryPolicy, 2534 ReferenceProcessor::DiscoveryPolicyMin, 2535 ReferenceProcessor::DiscoveryPolicyMax, 2536 "RefDiscoveryPolicy"); 2537 2538 // Limit the lower bound of this flag to 1 as it is used in a division 2539 // expression. 2540 status = status && verify_interval(TLABWasteTargetPercent, 2541 1, 100, "TLABWasteTargetPercent"); 2542 2543 status = status && verify_object_alignment(); 2544 2545 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2546 "CompressedClassSpaceSize"); 2547 2548 status = status && verify_interval(MarkStackSizeMax, 2549 1, (max_jint - 1), "MarkStackSizeMax"); 2550 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2551 2552 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2553 2554 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2555 2556 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2557 2558 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2559 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2560 2561 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2562 2563 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2564 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2565 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2566 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2567 2568 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2569 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2570 2571 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2572 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2573 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2574 2575 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2576 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2577 2578 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2579 // just for that, so hardcode here. 2580 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2581 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2582 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2583 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2584 2585 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2586 #ifdef COMPILER1 2587 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2588 #endif 2589 2590 if (PrintNMTStatistics) { 2591 #if INCLUDE_NMT 2592 if (MemTracker::tracking_level() == NMT_off) { 2593 #endif // INCLUDE_NMT 2594 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2595 PrintNMTStatistics = false; 2596 #if INCLUDE_NMT 2597 } 2598 #endif 2599 } 2600 2601 // Need to limit the extent of the padding to reasonable size. 2602 // 8K is well beyond the reasonable HW cache line size, even with the 2603 // aggressive prefetching, while still leaving the room for segregating 2604 // among the distinct pages. 2605 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2606 jio_fprintf(defaultStream::error_stream(), 2607 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2608 ContendedPaddingWidth, 0, 8192); 2609 status = false; 2610 } 2611 2612 // Need to enforce the padding not to break the existing field alignments. 2613 // It is sufficient to check against the largest type size. 2614 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2615 jio_fprintf(defaultStream::error_stream(), 2616 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2617 ContendedPaddingWidth, BytesPerLong); 2618 status = false; 2619 } 2620 2621 // Check lower bounds of the code cache 2622 // Template Interpreter code is approximately 3X larger in debug builds. 2623 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2624 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2625 jio_fprintf(defaultStream::error_stream(), 2626 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2627 os::vm_page_size()/K); 2628 status = false; 2629 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2630 jio_fprintf(defaultStream::error_stream(), 2631 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2632 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2633 status = false; 2634 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2635 jio_fprintf(defaultStream::error_stream(), 2636 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2637 min_code_cache_size/K); 2638 status = false; 2639 } else if (ReservedCodeCacheSize > 2*G) { 2640 // Code cache size larger than MAXINT is not supported. 2641 jio_fprintf(defaultStream::error_stream(), 2642 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2643 (2*G)/M); 2644 status = false; 2645 } 2646 2647 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2648 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2649 2650 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2651 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2652 } 2653 2654 #ifdef COMPILER1 2655 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset"); 2656 #endif 2657 2658 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2659 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2660 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2661 // Check the minimum number of compiler threads 2662 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2663 2664 return status; 2665 } 2666 2667 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2668 const char* option_type) { 2669 if (ignore) return false; 2670 2671 const char* spacer = " "; 2672 if (option_type == NULL) { 2673 option_type = ++spacer; // Set both to the empty string. 2674 } 2675 2676 if (os::obsolete_option(option)) { 2677 jio_fprintf(defaultStream::error_stream(), 2678 "Obsolete %s%soption: %s\n", option_type, spacer, 2679 option->optionString); 2680 return false; 2681 } else { 2682 jio_fprintf(defaultStream::error_stream(), 2683 "Unrecognized %s%soption: %s\n", option_type, spacer, 2684 option->optionString); 2685 return true; 2686 } 2687 } 2688 2689 static const char* user_assertion_options[] = { 2690 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2691 }; 2692 2693 static const char* system_assertion_options[] = { 2694 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2695 }; 2696 2697 // Return true if any of the strings in null-terminated array 'names' matches. 2698 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2699 // the option must match exactly. 2700 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2701 bool tail_allowed) { 2702 for (/* empty */; *names != NULL; ++names) { 2703 if (match_option(option, *names, tail)) { 2704 if (**tail == '\0' || tail_allowed && **tail == ':') { 2705 return true; 2706 } 2707 } 2708 } 2709 return false; 2710 } 2711 2712 bool Arguments::parse_uintx(const char* value, 2713 uintx* uintx_arg, 2714 uintx min_size) { 2715 2716 // Check the sign first since atomull() parses only unsigned values. 2717 bool value_is_positive = !(*value == '-'); 2718 2719 if (value_is_positive) { 2720 julong n; 2721 bool good_return = atomull(value, &n); 2722 if (good_return) { 2723 bool above_minimum = n >= min_size; 2724 bool value_is_too_large = n > max_uintx; 2725 2726 if (above_minimum && !value_is_too_large) { 2727 *uintx_arg = n; 2728 return true; 2729 } 2730 } 2731 } 2732 return false; 2733 } 2734 2735 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2736 julong* long_arg, 2737 julong min_size) { 2738 if (!atomull(s, long_arg)) return arg_unreadable; 2739 return check_memory_size(*long_arg, min_size); 2740 } 2741 2742 // Parse JavaVMInitArgs structure 2743 2744 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2745 // For components of the system classpath. 2746 SysClassPath scp(Arguments::get_sysclasspath()); 2747 bool scp_assembly_required = false; 2748 2749 // Save default settings for some mode flags 2750 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2751 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2752 Arguments::_ClipInlining = ClipInlining; 2753 Arguments::_BackgroundCompilation = BackgroundCompilation; 2754 2755 // Setup flags for mixed which is the default 2756 set_mode_flags(_mixed); 2757 2758 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2759 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2760 if (result != JNI_OK) { 2761 return result; 2762 } 2763 2764 // Parse JavaVMInitArgs structure passed in 2765 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2766 if (result != JNI_OK) { 2767 return result; 2768 } 2769 2770 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2771 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2772 if (result != JNI_OK) { 2773 return result; 2774 } 2775 2776 // We need to ensure processor and memory resources have been properly 2777 // configured - which may rely on arguments we just processed - before 2778 // doing the final argument processing. Any argument processing that 2779 // needs to know about processor and memory resources must occur after 2780 // this point. 2781 2782 os::init_container_support(); 2783 2784 // Do final processing now that all arguments have been parsed 2785 result = finalize_vm_init_args(&scp, scp_assembly_required); 2786 if (result != JNI_OK) { 2787 return result; 2788 } 2789 2790 return JNI_OK; 2791 } 2792 2793 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2794 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2795 // are dealing with -agentpath (case where name is a path), otherwise with 2796 // -agentlib 2797 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2798 char *_name; 2799 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2800 size_t _len_hprof, _len_jdwp, _len_prefix; 2801 2802 if (is_path) { 2803 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2804 return false; 2805 } 2806 2807 _name++; // skip past last path separator 2808 _len_prefix = strlen(JNI_LIB_PREFIX); 2809 2810 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2811 return false; 2812 } 2813 2814 _name += _len_prefix; 2815 _len_hprof = strlen(_hprof); 2816 _len_jdwp = strlen(_jdwp); 2817 2818 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2819 _name += _len_hprof; 2820 } 2821 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2822 _name += _len_jdwp; 2823 } 2824 else { 2825 return false; 2826 } 2827 2828 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2829 return false; 2830 } 2831 2832 return true; 2833 } 2834 2835 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2836 return true; 2837 } 2838 2839 return false; 2840 } 2841 2842 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2843 SysClassPath* scp_p, 2844 bool* scp_assembly_required_p, 2845 Flag::Flags origin) { 2846 // Remaining part of option string 2847 const char* tail; 2848 2849 // iterate over arguments 2850 for (int index = 0; index < args->nOptions; index++) { 2851 bool is_absolute_path = false; // for -agentpath vs -agentlib 2852 2853 const JavaVMOption* option = args->options + index; 2854 2855 if (!match_option(option, "-Djava.class.path", &tail) && 2856 !match_option(option, "-Dsun.java.command", &tail) && 2857 !match_option(option, "-Dsun.java.launcher", &tail)) { 2858 2859 // add all jvm options to the jvm_args string. This string 2860 // is used later to set the java.vm.args PerfData string constant. 2861 // the -Djava.class.path and the -Dsun.java.command options are 2862 // omitted from jvm_args string as each have their own PerfData 2863 // string constant object. 2864 build_jvm_args(option->optionString); 2865 } 2866 2867 // -verbose:[class/gc/jni] 2868 if (match_option(option, "-verbose", &tail)) { 2869 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2870 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2871 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2872 } else if (!strcmp(tail, ":gc")) { 2873 FLAG_SET_CMDLINE(bool, PrintGC, true); 2874 } else if (!strcmp(tail, ":jni")) { 2875 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2876 } 2877 // -da / -ea / -disableassertions / -enableassertions 2878 // These accept an optional class/package name separated by a colon, e.g., 2879 // -da:java.lang.Thread. 2880 } else if (match_option(option, user_assertion_options, &tail, true)) { 2881 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2882 if (*tail == '\0') { 2883 JavaAssertions::setUserClassDefault(enable); 2884 } else { 2885 assert(*tail == ':', "bogus match by match_option()"); 2886 JavaAssertions::addOption(tail + 1, enable); 2887 } 2888 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2889 } else if (match_option(option, system_assertion_options, &tail, false)) { 2890 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2891 JavaAssertions::setSystemClassDefault(enable); 2892 // -bootclasspath: 2893 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2894 scp_p->reset_path(tail); 2895 *scp_assembly_required_p = true; 2896 // -bootclasspath/a: 2897 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2898 scp_p->add_suffix(tail); 2899 *scp_assembly_required_p = true; 2900 // -bootclasspath/p: 2901 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2902 scp_p->add_prefix(tail); 2903 *scp_assembly_required_p = true; 2904 // -Xrun 2905 } else if (match_option(option, "-Xrun", &tail)) { 2906 if (tail != NULL) { 2907 const char* pos = strchr(tail, ':'); 2908 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2909 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2910 name[len] = '\0'; 2911 2912 char *options = NULL; 2913 if(pos != NULL) { 2914 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2915 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2916 } 2917 #if !INCLUDE_JVMTI 2918 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2919 jio_fprintf(defaultStream::error_stream(), 2920 "Profiling and debugging agents are not supported in this VM\n"); 2921 return JNI_ERR; 2922 } 2923 #endif // !INCLUDE_JVMTI 2924 add_init_library(name, options); 2925 } 2926 // -agentlib and -agentpath 2927 } else if (match_option(option, "-agentlib:", &tail) || 2928 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2929 if(tail != NULL) { 2930 const char* pos = strchr(tail, '='); 2931 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2932 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2933 name[len] = '\0'; 2934 2935 char *options = NULL; 2936 if(pos != NULL) { 2937 size_t length = strlen(pos + 1) + 1; 2938 options = NEW_C_HEAP_ARRAY(char, length, mtInternal); 2939 jio_snprintf(options, length, "%s", pos + 1); 2940 } 2941 #if !INCLUDE_JVMTI 2942 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2943 jio_fprintf(defaultStream::error_stream(), 2944 "Profiling and debugging agents are not supported in this VM\n"); 2945 return JNI_ERR; 2946 } 2947 #endif // !INCLUDE_JVMTI 2948 add_init_agent(name, options, is_absolute_path); 2949 } 2950 // -javaagent 2951 } else if (match_option(option, "-javaagent:", &tail)) { 2952 #if !INCLUDE_JVMTI 2953 jio_fprintf(defaultStream::error_stream(), 2954 "Instrumentation agents are not supported in this VM\n"); 2955 return JNI_ERR; 2956 #else 2957 if(tail != NULL) { 2958 size_t length = strlen(tail) + 1; 2959 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal); 2960 jio_snprintf(options, length, "%s", tail); 2961 add_init_agent("instrument", options, false); 2962 } 2963 #endif // !INCLUDE_JVMTI 2964 // -Xnoclassgc 2965 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2966 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2967 // -Xincgc: i-CMS 2968 } else if (match_option(option, "-Xincgc", &tail)) { 2969 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2970 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2971 // -Xnoincgc: no i-CMS 2972 } else if (match_option(option, "-Xnoincgc", &tail)) { 2973 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2974 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2975 // -Xconcgc 2976 } else if (match_option(option, "-Xconcgc", &tail)) { 2977 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2978 // -Xnoconcgc 2979 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2980 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2981 // -Xbatch 2982 } else if (match_option(option, "-Xbatch", &tail)) { 2983 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2984 // -Xmn for compatibility with other JVM vendors 2985 } else if (match_option(option, "-Xmn", &tail)) { 2986 julong long_initial_young_size = 0; 2987 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2988 if (errcode != arg_in_range) { 2989 jio_fprintf(defaultStream::error_stream(), 2990 "Invalid initial young generation size: %s\n", option->optionString); 2991 describe_range_error(errcode); 2992 return JNI_EINVAL; 2993 } 2994 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2995 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2996 // -Xms 2997 } else if (match_option(option, "-Xms", &tail)) { 2998 julong long_initial_heap_size = 0; 2999 // an initial heap size of 0 means automatically determine 3000 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 3001 if (errcode != arg_in_range) { 3002 jio_fprintf(defaultStream::error_stream(), 3003 "Invalid initial heap size: %s\n", option->optionString); 3004 describe_range_error(errcode); 3005 return JNI_EINVAL; 3006 } 3007 set_min_heap_size((uintx)long_initial_heap_size); 3008 // Currently the minimum size and the initial heap sizes are the same. 3009 // Can be overridden with -XX:InitialHeapSize. 3010 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 3011 // -Xmx 3012 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 3013 julong long_max_heap_size = 0; 3014 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 3015 if (errcode != arg_in_range) { 3016 jio_fprintf(defaultStream::error_stream(), 3017 "Invalid maximum heap size: %s\n", option->optionString); 3018 describe_range_error(errcode); 3019 return JNI_EINVAL; 3020 } 3021 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 3022 // Xmaxf 3023 } else if (match_option(option, "-Xmaxf", &tail)) { 3024 char* err; 3025 int maxf = (int)(strtod(tail, &err) * 100); 3026 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 3027 jio_fprintf(defaultStream::error_stream(), 3028 "Bad max heap free percentage size: %s\n", 3029 option->optionString); 3030 return JNI_EINVAL; 3031 } else { 3032 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 3033 } 3034 // Xminf 3035 } else if (match_option(option, "-Xminf", &tail)) { 3036 char* err; 3037 int minf = (int)(strtod(tail, &err) * 100); 3038 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 3039 jio_fprintf(defaultStream::error_stream(), 3040 "Bad min heap free percentage size: %s\n", 3041 option->optionString); 3042 return JNI_EINVAL; 3043 } else { 3044 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 3045 } 3046 // -Xss 3047 } else if (match_option(option, "-Xss", &tail)) { 3048 julong long_ThreadStackSize = 0; 3049 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3050 if (errcode != arg_in_range) { 3051 jio_fprintf(defaultStream::error_stream(), 3052 "Invalid thread stack size: %s\n", option->optionString); 3053 describe_range_error(errcode); 3054 return JNI_EINVAL; 3055 } 3056 // Internally track ThreadStackSize in units of 1024 bytes. 3057 FLAG_SET_CMDLINE(intx, ThreadStackSize, 3058 round_to((int)long_ThreadStackSize, K) / K); 3059 // -Xoss 3060 } else if (match_option(option, "-Xoss", &tail)) { 3061 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 3062 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3063 julong long_CodeCacheExpansionSize = 0; 3064 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3065 if (errcode != arg_in_range) { 3066 jio_fprintf(defaultStream::error_stream(), 3067 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3068 os::vm_page_size()/K); 3069 return JNI_EINVAL; 3070 } 3071 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 3072 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3073 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3074 julong long_ReservedCodeCacheSize = 0; 3075 3076 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3077 if (errcode != arg_in_range) { 3078 jio_fprintf(defaultStream::error_stream(), 3079 "Invalid maximum code cache size: %s.\n", option->optionString); 3080 return JNI_EINVAL; 3081 } 3082 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 3083 //-XX:IncreaseFirstTierCompileThresholdAt= 3084 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 3085 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 3086 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 3087 jio_fprintf(defaultStream::error_stream(), 3088 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 3089 option->optionString); 3090 return JNI_EINVAL; 3091 } 3092 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 3093 // -green 3094 } else if (match_option(option, "-green", &tail)) { 3095 jio_fprintf(defaultStream::error_stream(), 3096 "Green threads support not available\n"); 3097 return JNI_EINVAL; 3098 // -native 3099 } else if (match_option(option, "-native", &tail)) { 3100 // HotSpot always uses native threads, ignore silently for compatibility 3101 // -Xsqnopause 3102 } else if (match_option(option, "-Xsqnopause", &tail)) { 3103 // EVM option, ignore silently for compatibility 3104 // -Xrs 3105 } else if (match_option(option, "-Xrs", &tail)) { 3106 // Classic/EVM option, new functionality 3107 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 3108 } else if (match_option(option, "-Xusealtsigs", &tail)) { 3109 // change default internal VM signals used - lower case for back compat 3110 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 3111 // -Xoptimize 3112 } else if (match_option(option, "-Xoptimize", &tail)) { 3113 // EVM option, ignore silently for compatibility 3114 // -Xprof 3115 } else if (match_option(option, "-Xprof", &tail)) { 3116 #if INCLUDE_FPROF 3117 _has_profile = true; 3118 #else // INCLUDE_FPROF 3119 jio_fprintf(defaultStream::error_stream(), 3120 "Flat profiling is not supported in this VM.\n"); 3121 return JNI_ERR; 3122 #endif // INCLUDE_FPROF 3123 // -Xconcurrentio 3124 } else if (match_option(option, "-Xconcurrentio", &tail)) { 3125 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 3126 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 3127 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 3128 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3129 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 3130 3131 // -Xinternalversion 3132 } else if (match_option(option, "-Xinternalversion", &tail)) { 3133 jio_fprintf(defaultStream::output_stream(), "%s\n", 3134 VM_Version::internal_vm_info_string()); 3135 vm_exit(0); 3136 #ifndef PRODUCT 3137 // -Xprintflags 3138 } else if (match_option(option, "-Xprintflags", &tail)) { 3139 CommandLineFlags::printFlags(tty, false); 3140 vm_exit(0); 3141 #endif 3142 // -D 3143 } else if (match_option(option, "-D", &tail)) { 3144 if (CheckEndorsedAndExtDirs) { 3145 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) { 3146 // abort if -Djava.endorsed.dirs is set 3147 jio_fprintf(defaultStream::output_stream(), 3148 "-Djava.endorsed.dirs will not be supported in a future release.\n" 3149 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n"); 3150 return JNI_EINVAL; 3151 } 3152 if (match_option(option, "-Djava.ext.dirs=", &tail)) { 3153 // abort if -Djava.ext.dirs is set 3154 jio_fprintf(defaultStream::output_stream(), 3155 "-Djava.ext.dirs will not be supported in a future release.\n" 3156 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n"); 3157 return JNI_EINVAL; 3158 } 3159 } 3160 3161 if (!add_property(tail)) { 3162 return JNI_ENOMEM; 3163 } 3164 // Out of the box management support 3165 if (match_option(option, "-Dcom.sun.management", &tail)) { 3166 #if INCLUDE_MANAGEMENT 3167 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3168 #else 3169 jio_fprintf(defaultStream::output_stream(), 3170 "-Dcom.sun.management is not supported in this VM.\n"); 3171 return JNI_ERR; 3172 #endif 3173 } 3174 // -Xint 3175 } else if (match_option(option, "-Xint", &tail)) { 3176 set_mode_flags(_int); 3177 // -Xmixed 3178 } else if (match_option(option, "-Xmixed", &tail)) { 3179 set_mode_flags(_mixed); 3180 // -Xcomp 3181 } else if (match_option(option, "-Xcomp", &tail)) { 3182 // for testing the compiler; turn off all flags that inhibit compilation 3183 set_mode_flags(_comp); 3184 // -Xshare:dump 3185 } else if (match_option(option, "-Xshare:dump", &tail)) { 3186 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3187 set_mode_flags(_int); // Prevent compilation, which creates objects 3188 // -Xshare:on 3189 } else if (match_option(option, "-Xshare:on", &tail)) { 3190 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3191 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3192 // -Xshare:auto 3193 } else if (match_option(option, "-Xshare:auto", &tail)) { 3194 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3195 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3196 // -Xshare:off 3197 } else if (match_option(option, "-Xshare:off", &tail)) { 3198 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3199 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3200 // -Xverify 3201 } else if (match_option(option, "-Xverify", &tail)) { 3202 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3203 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3204 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3205 } else if (strcmp(tail, ":remote") == 0) { 3206 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3207 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3208 } else if (strcmp(tail, ":none") == 0) { 3209 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3210 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3211 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3212 return JNI_EINVAL; 3213 } 3214 // -Xdebug 3215 } else if (match_option(option, "-Xdebug", &tail)) { 3216 // note this flag has been used, then ignore 3217 set_xdebug_mode(true); 3218 // -Xnoagent 3219 } else if (match_option(option, "-Xnoagent", &tail)) { 3220 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3221 } else if (match_option(option, "-Xboundthreads", &tail)) { 3222 // Bind user level threads to kernel threads (Solaris only) 3223 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3224 } else if (match_option(option, "-Xloggc:", &tail)) { 3225 // Redirect GC output to the file. -Xloggc:<filename> 3226 // ostream_init_log(), when called will use this filename 3227 // to initialize a fileStream. 3228 _gc_log_filename = strdup(tail); 3229 if (!is_filename_valid(_gc_log_filename)) { 3230 jio_fprintf(defaultStream::output_stream(), 3231 "Invalid file name for use with -Xloggc: Filename can only contain the " 3232 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3233 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3234 return JNI_EINVAL; 3235 } 3236 FLAG_SET_CMDLINE(bool, PrintGC, true); 3237 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3238 3239 // JNI hooks 3240 } else if (match_option(option, "-Xcheck", &tail)) { 3241 if (!strcmp(tail, ":jni")) { 3242 #if !INCLUDE_JNI_CHECK 3243 warning("JNI CHECKING is not supported in this VM"); 3244 #else 3245 CheckJNICalls = true; 3246 #endif // INCLUDE_JNI_CHECK 3247 } else if (is_bad_option(option, args->ignoreUnrecognized, 3248 "check")) { 3249 return JNI_EINVAL; 3250 } 3251 } else if (match_option(option, "vfprintf", &tail)) { 3252 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3253 } else if (match_option(option, "exit", &tail)) { 3254 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3255 } else if (match_option(option, "abort", &tail)) { 3256 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3257 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3258 // The last option must always win. 3259 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3260 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3261 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3262 // The last option must always win. 3263 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3264 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3265 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3266 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3267 jio_fprintf(defaultStream::error_stream(), 3268 "Please use CMSClassUnloadingEnabled in place of " 3269 "CMSPermGenSweepingEnabled in the future\n"); 3270 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3271 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3272 jio_fprintf(defaultStream::error_stream(), 3273 "Please use -XX:+UseGCOverheadLimit in place of " 3274 "-XX:+UseGCTimeLimit in the future\n"); 3275 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3276 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3277 jio_fprintf(defaultStream::error_stream(), 3278 "Please use -XX:-UseGCOverheadLimit in place of " 3279 "-XX:-UseGCTimeLimit in the future\n"); 3280 // The TLE options are for compatibility with 1.3 and will be 3281 // removed without notice in a future release. These options 3282 // are not to be documented. 3283 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3284 // No longer used. 3285 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3286 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3287 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3288 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3289 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3290 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3291 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3292 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3293 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3294 // No longer used. 3295 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3296 julong long_tlab_size = 0; 3297 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3298 if (errcode != arg_in_range) { 3299 jio_fprintf(defaultStream::error_stream(), 3300 "Invalid TLAB size: %s\n", option->optionString); 3301 describe_range_error(errcode); 3302 return JNI_EINVAL; 3303 } 3304 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3305 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3306 // No longer used. 3307 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3308 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3309 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3310 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3311 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3312 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3313 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3314 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3315 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3316 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3317 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3318 #if defined(DTRACE_ENABLED) 3319 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3320 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3321 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3322 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3323 #else // defined(DTRACE_ENABLED) 3324 jio_fprintf(defaultStream::error_stream(), 3325 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3326 return JNI_EINVAL; 3327 #endif // defined(DTRACE_ENABLED) 3328 #ifdef ASSERT 3329 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3330 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3331 // disable scavenge before parallel mark-compact 3332 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3333 #endif 3334 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3335 julong cms_blocks_to_claim = (julong)atol(tail); 3336 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3337 jio_fprintf(defaultStream::error_stream(), 3338 "Please use -XX:OldPLABSize in place of " 3339 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3340 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3341 julong cms_blocks_to_claim = (julong)atol(tail); 3342 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3343 jio_fprintf(defaultStream::error_stream(), 3344 "Please use -XX:OldPLABSize in place of " 3345 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3346 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3347 julong old_plab_size = 0; 3348 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3349 if (errcode != arg_in_range) { 3350 jio_fprintf(defaultStream::error_stream(), 3351 "Invalid old PLAB size: %s\n", option->optionString); 3352 describe_range_error(errcode); 3353 return JNI_EINVAL; 3354 } 3355 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3356 jio_fprintf(defaultStream::error_stream(), 3357 "Please use -XX:OldPLABSize in place of " 3358 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3359 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3360 julong young_plab_size = 0; 3361 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3362 if (errcode != arg_in_range) { 3363 jio_fprintf(defaultStream::error_stream(), 3364 "Invalid young PLAB size: %s\n", option->optionString); 3365 describe_range_error(errcode); 3366 return JNI_EINVAL; 3367 } 3368 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3369 jio_fprintf(defaultStream::error_stream(), 3370 "Please use -XX:YoungPLABSize in place of " 3371 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3372 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3373 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3374 julong stack_size = 0; 3375 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3376 if (errcode != arg_in_range) { 3377 jio_fprintf(defaultStream::error_stream(), 3378 "Invalid mark stack size: %s\n", option->optionString); 3379 describe_range_error(errcode); 3380 return JNI_EINVAL; 3381 } 3382 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3383 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3384 julong max_stack_size = 0; 3385 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3386 if (errcode != arg_in_range) { 3387 jio_fprintf(defaultStream::error_stream(), 3388 "Invalid maximum mark stack size: %s\n", 3389 option->optionString); 3390 describe_range_error(errcode); 3391 return JNI_EINVAL; 3392 } 3393 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3394 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3395 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3396 uintx conc_threads = 0; 3397 if (!parse_uintx(tail, &conc_threads, 1)) { 3398 jio_fprintf(defaultStream::error_stream(), 3399 "Invalid concurrent threads: %s\n", option->optionString); 3400 return JNI_EINVAL; 3401 } 3402 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3403 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3404 julong max_direct_memory_size = 0; 3405 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3406 if (errcode != arg_in_range) { 3407 jio_fprintf(defaultStream::error_stream(), 3408 "Invalid maximum direct memory size: %s\n", 3409 option->optionString); 3410 describe_range_error(errcode); 3411 return JNI_EINVAL; 3412 } 3413 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3414 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3415 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3416 // away and will cause VM initialization failures! 3417 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3418 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3419 #if !INCLUDE_MANAGEMENT 3420 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3421 jio_fprintf(defaultStream::error_stream(), 3422 "ManagementServer is not supported in this VM.\n"); 3423 return JNI_ERR; 3424 #endif // INCLUDE_MANAGEMENT 3425 #if INCLUDE_JFR 3426 } else if (match_jfr_option(&option)) { 3427 return JNI_EINVAL; 3428 #endif 3429 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3430 // Skip -XX:Flags= since that case has already been handled 3431 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3432 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3433 return JNI_EINVAL; 3434 } 3435 } 3436 // Unknown option 3437 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3438 return JNI_ERR; 3439 } 3440 } 3441 3442 // PrintSharedArchiveAndExit will turn on 3443 // -Xshare:on 3444 // -XX:+TraceClassPaths 3445 if (PrintSharedArchiveAndExit) { 3446 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3447 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3448 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3449 } 3450 3451 // Change the default value for flags which have different default values 3452 // when working with older JDKs. 3453 #ifdef LINUX 3454 if (JDK_Version::current().compare_major(6) <= 0 && 3455 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3456 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3457 } 3458 #endif // LINUX 3459 fix_appclasspath(); 3460 return JNI_OK; 3461 } 3462 3463 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3464 // 3465 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3466 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3467 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3468 // path is treated as the current directory. 3469 // 3470 // This causes problems with CDS, which requires that all directories specified in the classpath 3471 // must be empty. In most cases, applications do NOT want to load classes from the current 3472 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3473 // scripts compatible with CDS. 3474 void Arguments::fix_appclasspath() { 3475 if (IgnoreEmptyClassPaths) { 3476 const char separator = *os::path_separator(); 3477 const char* src = _java_class_path->value(); 3478 3479 // skip over all the leading empty paths 3480 while (*src == separator) { 3481 src ++; 3482 } 3483 3484 char* copy = os::strdup(src, mtInternal); 3485 3486 // trim all trailing empty paths 3487 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3488 *tail = '\0'; 3489 } 3490 3491 char from[3] = {separator, separator, '\0'}; 3492 char to [2] = {separator, '\0'}; 3493 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3494 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3495 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3496 } 3497 3498 _java_class_path->set_value(copy); 3499 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3500 } 3501 3502 if (!PrintSharedArchiveAndExit) { 3503 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value()); 3504 } 3505 } 3506 3507 static bool has_jar_files(const char* directory) { 3508 DIR* dir = os::opendir(directory); 3509 if (dir == NULL) return false; 3510 3511 struct dirent *entry; 3512 bool hasJarFile = false; 3513 while (!hasJarFile && (entry = os::readdir(dir)) != NULL) { 3514 const char* name = entry->d_name; 3515 const char* ext = name + strlen(name) - 4; 3516 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3517 } 3518 os::closedir(dir); 3519 return hasJarFile ; 3520 } 3521 3522 // returns the number of directories in the given path containing JAR files 3523 // If the skip argument is not NULL, it will skip that directory 3524 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) { 3525 const char separator = *os::path_separator(); 3526 const char* const end = path + strlen(path); 3527 int nonEmptyDirs = 0; 3528 while (path < end) { 3529 const char* tmp_end = strchr(path, separator); 3530 if (tmp_end == NULL) { 3531 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) { 3532 nonEmptyDirs++; 3533 jio_fprintf(defaultStream::output_stream(), 3534 "Non-empty %s directory: %s\n", type, path); 3535 } 3536 path = end; 3537 } else { 3538 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3539 memcpy(dirpath, path, tmp_end - path); 3540 dirpath[tmp_end - path] = '\0'; 3541 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) { 3542 nonEmptyDirs++; 3543 jio_fprintf(defaultStream::output_stream(), 3544 "Non-empty %s directory: %s\n", type, dirpath); 3545 } 3546 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 3547 path = tmp_end + 1; 3548 } 3549 } 3550 return nonEmptyDirs; 3551 } 3552 3553 // Returns true if endorsed standards override mechanism and extension mechanism 3554 // are not used. 3555 static bool check_endorsed_and_ext_dirs() { 3556 if (!CheckEndorsedAndExtDirs) 3557 return true; 3558 3559 char endorsedDir[JVM_MAXPATHLEN]; 3560 char extDir[JVM_MAXPATHLEN]; 3561 const char* fileSep = os::file_separator(); 3562 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed", 3563 Arguments::get_java_home(), fileSep, fileSep); 3564 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext", 3565 Arguments::get_java_home(), fileSep, fileSep); 3566 3567 // check endorsed directory 3568 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL); 3569 3570 // check the extension directories but skip the default lib/ext directory 3571 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir); 3572 3573 // List of JAR files installed in the default lib/ext directory. 3574 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed 3575 static const char* jdk_ext_jars[] = { 3576 "access-bridge-32.jar", 3577 "access-bridge-64.jar", 3578 "access-bridge.jar", 3579 "cldrdata.jar", 3580 "dnsns.jar", 3581 "jaccess.jar", 3582 "jfxrt.jar", 3583 "localedata.jar", 3584 "nashorn.jar", 3585 "sunec.jar", 3586 "sunjce_provider.jar", 3587 "sunmscapi.jar", 3588 "sunpkcs11.jar", 3589 "ucrypto.jar", 3590 "zipfs.jar", 3591 NULL 3592 }; 3593 3594 // check if the default lib/ext directory has any non-JDK jar files; if so, error 3595 DIR* dir = os::opendir(extDir); 3596 if (dir != NULL) { 3597 int num_ext_jars = 0; 3598 struct dirent *entry; 3599 while ((entry = os::readdir(dir)) != NULL) { 3600 const char* name = entry->d_name; 3601 const char* ext = name + strlen(name) - 4; 3602 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) { 3603 bool is_jdk_jar = false; 3604 const char* jarfile = NULL; 3605 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) { 3606 if (os::file_name_strcmp(name, jarfile) == 0) { 3607 is_jdk_jar = true; 3608 break; 3609 } 3610 } 3611 if (!is_jdk_jar) { 3612 jio_fprintf(defaultStream::output_stream(), 3613 "%s installed in <JAVA_HOME>/lib/ext\n", name); 3614 num_ext_jars++; 3615 } 3616 } 3617 } 3618 os::closedir(dir); 3619 if (num_ext_jars > 0) { 3620 nonEmptyDirs += 1; 3621 } 3622 } 3623 3624 // check if the default lib/endorsed directory exists; if so, error 3625 dir = os::opendir(endorsedDir); 3626 if (dir != NULL) { 3627 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n"); 3628 os::closedir(dir); 3629 nonEmptyDirs += 1; 3630 } 3631 3632 if (nonEmptyDirs > 0) { 3633 jio_fprintf(defaultStream::output_stream(), 3634 "Endorsed standards override mechanism and extension mechanism " 3635 "will not be supported in a future release.\n" 3636 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n"); 3637 return false; 3638 } 3639 3640 return true; 3641 } 3642 3643 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3644 // This must be done after all -D arguments have been processed. 3645 scp_p->expand_endorsed(); 3646 3647 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3648 // Assemble the bootclasspath elements into the final path. 3649 Arguments::set_sysclasspath(scp_p->combined_path()); 3650 } 3651 3652 if (!check_endorsed_and_ext_dirs()) { 3653 return JNI_ERR; 3654 } 3655 3656 // This must be done after all arguments have been processed 3657 // and the container support has been initialized since AggressiveHeap 3658 // relies on the amount of total memory available. 3659 if (AggressiveHeap) { 3660 jint result = set_aggressive_heap_flags(); 3661 if (result != JNI_OK) { 3662 return result; 3663 } 3664 } 3665 // This must be done after all arguments have been processed. 3666 // java_compiler() true means set to "NONE" or empty. 3667 if (java_compiler() && !xdebug_mode()) { 3668 // For backwards compatibility, we switch to interpreted mode if 3669 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3670 // not specified. 3671 set_mode_flags(_int); 3672 } 3673 if (CompileThreshold == 0) { 3674 set_mode_flags(_int); 3675 } 3676 3677 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3678 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3679 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3680 } 3681 3682 #ifndef COMPILER2 3683 // Don't degrade server performance for footprint 3684 if (FLAG_IS_DEFAULT(UseLargePages) && 3685 MaxHeapSize < LargePageHeapSizeThreshold) { 3686 // No need for large granularity pages w/small heaps. 3687 // Note that large pages are enabled/disabled for both the 3688 // Java heap and the code cache. 3689 FLAG_SET_DEFAULT(UseLargePages, false); 3690 } 3691 3692 #else 3693 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3694 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3695 } 3696 #endif 3697 3698 #ifndef TIERED 3699 // Tiered compilation is undefined. 3700 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3701 #endif 3702 3703 // If we are running in a headless jre, force java.awt.headless property 3704 // to be true unless the property has already been set. 3705 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3706 if (os::is_headless_jre()) { 3707 const char* headless = Arguments::get_property("java.awt.headless"); 3708 if (headless == NULL) { 3709 char envbuffer[128]; 3710 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3711 if (!add_property("java.awt.headless=true")) { 3712 return JNI_ENOMEM; 3713 } 3714 } else { 3715 char buffer[256]; 3716 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer); 3717 if (!add_property(buffer)) { 3718 return JNI_ENOMEM; 3719 } 3720 } 3721 } 3722 } 3723 3724 if (!check_vm_args_consistency()) { 3725 return JNI_ERR; 3726 } 3727 3728 return JNI_OK; 3729 } 3730 3731 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3732 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3733 scp_assembly_required_p); 3734 } 3735 3736 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3737 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3738 scp_assembly_required_p); 3739 } 3740 3741 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3742 const int N_MAX_OPTIONS = 64; 3743 const int OPTION_BUFFER_SIZE = 1024; 3744 char buffer[OPTION_BUFFER_SIZE]; 3745 3746 // The variable will be ignored if it exceeds the length of the buffer. 3747 // Don't check this variable if user has special privileges 3748 // (e.g. unix su command). 3749 if (os::getenv(name, buffer, sizeof(buffer)) && 3750 !os::have_special_privileges()) { 3751 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3752 jio_fprintf(defaultStream::error_stream(), 3753 "Picked up %s: %s\n", name, buffer); 3754 char* rd = buffer; // pointer to the input string (rd) 3755 int i; 3756 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3757 while (isspace(*rd)) rd++; // skip whitespace 3758 if (*rd == 0) break; // we re done when the input string is read completely 3759 3760 // The output, option string, overwrites the input string. 3761 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3762 // input string (rd). 3763 char* wrt = rd; 3764 3765 options[i++].optionString = wrt; // Fill in option 3766 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3767 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3768 int quote = *rd; // matching quote to look for 3769 rd++; // don't copy open quote 3770 while (*rd != quote) { // include everything (even spaces) up until quote 3771 if (*rd == 0) { // string termination means unmatched string 3772 jio_fprintf(defaultStream::error_stream(), 3773 "Unmatched quote in %s\n", name); 3774 return JNI_ERR; 3775 } 3776 *wrt++ = *rd++; // copy to option string 3777 } 3778 rd++; // don't copy close quote 3779 } else { 3780 *wrt++ = *rd++; // copy to option string 3781 } 3782 } 3783 // Need to check if we're done before writing a NULL, 3784 // because the write could be to the byte that rd is pointing to. 3785 if (*rd++ == 0) { 3786 *wrt = 0; 3787 break; 3788 } 3789 *wrt = 0; // Zero terminate option 3790 } 3791 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3792 JavaVMInitArgs vm_args; 3793 vm_args.version = JNI_VERSION_1_2; 3794 vm_args.options = options; 3795 vm_args.nOptions = i; 3796 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3797 3798 if (PrintVMOptions) { 3799 const char* tail; 3800 for (int i = 0; i < vm_args.nOptions; i++) { 3801 const JavaVMOption *option = vm_args.options + i; 3802 if (match_option(option, "-XX:", &tail)) { 3803 logOption(tail); 3804 } 3805 } 3806 } 3807 3808 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3809 } 3810 return JNI_OK; 3811 } 3812 3813 void Arguments::set_shared_spaces_flags() { 3814 if (DumpSharedSpaces) { 3815 if (FailOverToOldVerifier) { 3816 // Don't fall back to the old verifier on verification failure. If a 3817 // class fails verification with the split verifier, it might fail the 3818 // CDS runtime verifier constraint check. In that case, we don't want 3819 // to share the class. We only archive classes that pass the split verifier. 3820 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3821 } 3822 3823 if (RequireSharedSpaces) { 3824 warning("cannot dump shared archive while using shared archive"); 3825 } 3826 UseSharedSpaces = false; 3827 #ifdef _LP64 3828 if (!UseCompressedOops || !UseCompressedClassPointers) { 3829 vm_exit_during_initialization( 3830 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3831 } 3832 } else { 3833 if (!UseCompressedOops || !UseCompressedClassPointers) { 3834 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3835 } 3836 #endif 3837 } 3838 } 3839 3840 #if !INCLUDE_ALL_GCS 3841 static void force_serial_gc() { 3842 FLAG_SET_DEFAULT(UseSerialGC, true); 3843 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3844 UNSUPPORTED_GC_OPTION(UseG1GC); 3845 UNSUPPORTED_GC_OPTION(UseParallelGC); 3846 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3847 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3848 UNSUPPORTED_GC_OPTION(UseParNewGC); 3849 } 3850 #endif // INCLUDE_ALL_GCS 3851 3852 // Sharing support 3853 // Construct the path to the archive 3854 static char* get_shared_archive_path() { 3855 char *shared_archive_path; 3856 if (SharedArchiveFile == NULL) { 3857 char jvm_path[JVM_MAXPATHLEN]; 3858 os::jvm_path(jvm_path, sizeof(jvm_path)); 3859 char *end = strrchr(jvm_path, *os::file_separator()); 3860 if (end != NULL) *end = '\0'; 3861 size_t jvm_path_len = strlen(jvm_path); 3862 size_t file_sep_len = strlen(os::file_separator()); 3863 const size_t len = jvm_path_len + file_sep_len + 20; 3864 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3865 if (shared_archive_path != NULL) { 3866 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3867 jvm_path, os::file_separator()); 3868 } 3869 } else { 3870 shared_archive_path = os::strdup(SharedArchiveFile, mtInternal); 3871 } 3872 return shared_archive_path; 3873 } 3874 3875 #ifndef PRODUCT 3876 // Determine whether LogVMOutput should be implicitly turned on. 3877 static bool use_vm_log() { 3878 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3879 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3880 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3881 PrintAssembly || TraceDeoptimization || TraceDependencies || 3882 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3883 return true; 3884 } 3885 3886 #ifdef COMPILER1 3887 if (PrintC1Statistics) { 3888 return true; 3889 } 3890 #endif // COMPILER1 3891 3892 #ifdef COMPILER2 3893 if (PrintOptoAssembly || PrintOptoStatistics) { 3894 return true; 3895 } 3896 #endif // COMPILER2 3897 3898 return false; 3899 } 3900 #endif // PRODUCT 3901 3902 // Parse entry point called from JNI_CreateJavaVM 3903 3904 jint Arguments::parse(const JavaVMInitArgs* args) { 3905 3906 // Remaining part of option string 3907 const char* tail; 3908 3909 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3910 const char* hotspotrc = ".hotspotrc"; 3911 bool settings_file_specified = false; 3912 bool needs_hotspotrc_warning = false; 3913 3914 ArgumentsExt::process_options(args); 3915 3916 const char* flags_file; 3917 int index; 3918 for (index = 0; index < args->nOptions; index++) { 3919 const JavaVMOption *option = args->options + index; 3920 if (match_option(option, "-XX:Flags=", &tail)) { 3921 flags_file = tail; 3922 settings_file_specified = true; 3923 } 3924 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3925 PrintVMOptions = true; 3926 } 3927 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3928 PrintVMOptions = false; 3929 } 3930 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3931 IgnoreUnrecognizedVMOptions = true; 3932 } 3933 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3934 IgnoreUnrecognizedVMOptions = false; 3935 } 3936 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3937 CommandLineFlags::printFlags(tty, false); 3938 vm_exit(0); 3939 } 3940 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3941 #if INCLUDE_NMT 3942 // The launcher did not setup nmt environment variable properly. 3943 if (!MemTracker::check_launcher_nmt_support(tail)) { 3944 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3945 } 3946 3947 // Verify if nmt option is valid. 3948 if (MemTracker::verify_nmt_option()) { 3949 // Late initialization, still in single-threaded mode. 3950 if (MemTracker::tracking_level() >= NMT_summary) { 3951 MemTracker::init(); 3952 } 3953 } else { 3954 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3955 } 3956 #else 3957 jio_fprintf(defaultStream::error_stream(), 3958 "Native Memory Tracking is not supported in this VM\n"); 3959 return JNI_ERR; 3960 #endif 3961 } 3962 3963 3964 #ifndef PRODUCT 3965 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3966 CommandLineFlags::printFlags(tty, true); 3967 vm_exit(0); 3968 } 3969 #endif 3970 } 3971 3972 if (IgnoreUnrecognizedVMOptions) { 3973 // uncast const to modify the flag args->ignoreUnrecognized 3974 *(jboolean*)(&args->ignoreUnrecognized) = true; 3975 } 3976 3977 // Parse specified settings file 3978 if (settings_file_specified) { 3979 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3980 return JNI_EINVAL; 3981 } 3982 } else { 3983 #ifdef ASSERT 3984 // Parse default .hotspotrc settings file 3985 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3986 return JNI_EINVAL; 3987 } 3988 #else 3989 struct stat buf; 3990 if (os::stat(hotspotrc, &buf) == 0) { 3991 needs_hotspotrc_warning = true; 3992 } 3993 #endif 3994 } 3995 3996 if (PrintVMOptions) { 3997 for (index = 0; index < args->nOptions; index++) { 3998 const JavaVMOption *option = args->options + index; 3999 if (match_option(option, "-XX:", &tail)) { 4000 logOption(tail); 4001 } 4002 } 4003 } 4004 4005 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4006 jint result = parse_vm_init_args(args); 4007 if (result != JNI_OK) { 4008 return result; 4009 } 4010 4011 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4012 SharedArchivePath = get_shared_archive_path(); 4013 if (SharedArchivePath == NULL) { 4014 return JNI_ENOMEM; 4015 } 4016 4017 // Set up VerifySharedSpaces 4018 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4019 VerifySharedSpaces = true; 4020 } 4021 4022 // Delay warning until here so that we've had a chance to process 4023 // the -XX:-PrintWarnings flag 4024 if (needs_hotspotrc_warning) { 4025 warning("%s file is present but has been ignored. " 4026 "Run with -XX:Flags=%s to load the file.", 4027 hotspotrc, hotspotrc); 4028 } 4029 4030 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 4031 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 4032 #endif 4033 4034 #if INCLUDE_ALL_GCS 4035 #if (defined JAVASE_EMBEDDED || defined ARM) 4036 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 4037 #endif 4038 #endif 4039 4040 #ifndef PRODUCT 4041 if (TraceBytecodesAt != 0) { 4042 TraceBytecodes = true; 4043 } 4044 if (CountCompiledCalls) { 4045 if (UseCounterDecay) { 4046 warning("UseCounterDecay disabled because CountCalls is set"); 4047 UseCounterDecay = false; 4048 } 4049 } 4050 #endif // PRODUCT 4051 4052 // JSR 292 is not supported before 1.7 4053 if (!JDK_Version::is_gte_jdk17x_version()) { 4054 if (EnableInvokeDynamic) { 4055 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 4056 warning("JSR 292 is not supported before 1.7. Disabling support."); 4057 } 4058 EnableInvokeDynamic = false; 4059 } 4060 } 4061 4062 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 4063 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4064 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 4065 } 4066 ScavengeRootsInCode = 1; 4067 } 4068 4069 if (PrintGCDetails) { 4070 // Turn on -verbose:gc options as well 4071 PrintGC = true; 4072 } 4073 4074 if (!JDK_Version::is_gte_jdk18x_version()) { 4075 // To avoid changing the log format for 7 updates this flag is only 4076 // true by default in JDK8 and above. 4077 if (FLAG_IS_DEFAULT(PrintGCCause)) { 4078 FLAG_SET_DEFAULT(PrintGCCause, false); 4079 } 4080 } 4081 4082 // Set object alignment values. 4083 set_object_alignment(); 4084 4085 #if !INCLUDE_ALL_GCS 4086 force_serial_gc(); 4087 #endif // INCLUDE_ALL_GCS 4088 #if !INCLUDE_CDS 4089 if (DumpSharedSpaces || RequireSharedSpaces) { 4090 jio_fprintf(defaultStream::error_stream(), 4091 "Shared spaces are not supported in this VM\n"); 4092 return JNI_ERR; 4093 } 4094 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4095 warning("Shared spaces are not supported in this VM"); 4096 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4097 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4098 } 4099 no_shared_spaces("CDS Disabled"); 4100 #endif // INCLUDE_CDS 4101 4102 return JNI_OK; 4103 } 4104 4105 jint Arguments::apply_ergo() { 4106 4107 // Set flags based on ergonomics. 4108 set_ergonomics_flags(); 4109 4110 set_shared_spaces_flags(); 4111 4112 #if defined(SPARC) 4113 // BIS instructions require 'membar' instruction regardless of the number 4114 // of CPUs because in virtualized/container environments which might use only 1 4115 // CPU, BIS instructions may produce incorrect results. 4116 4117 if (FLAG_IS_DEFAULT(AssumeMP)) { 4118 FLAG_SET_DEFAULT(AssumeMP, true); 4119 } 4120 #endif 4121 4122 // Check the GC selections again. 4123 if (!check_gc_consistency()) { 4124 return JNI_EINVAL; 4125 } 4126 4127 if (TieredCompilation) { 4128 set_tiered_flags(); 4129 } else { 4130 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 4131 if (CompilationPolicyChoice >= 2) { 4132 vm_exit_during_initialization( 4133 "Incompatible compilation policy selected", NULL); 4134 } 4135 } 4136 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 4137 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 4138 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 4139 } 4140 4141 4142 // Set heap size based on available physical memory 4143 set_heap_size(); 4144 4145 ArgumentsExt::set_gc_specific_flags(); 4146 4147 // Initialize Metaspace flags and alignments. 4148 Metaspace::ergo_initialize(); 4149 4150 // Set bytecode rewriting flags 4151 set_bytecode_flags(); 4152 4153 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 4154 set_aggressive_opts_flags(); 4155 4156 // Turn off biased locking for locking debug mode flags, 4157 // which are subtlely different from each other but neither works with 4158 // biased locking. 4159 if (UseHeavyMonitors 4160 #ifdef COMPILER1 4161 || !UseFastLocking 4162 #endif // COMPILER1 4163 ) { 4164 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4165 // flag set to true on command line; warn the user that they 4166 // can't enable biased locking here 4167 warning("Biased Locking is not supported with locking debug flags" 4168 "; ignoring UseBiasedLocking flag." ); 4169 } 4170 UseBiasedLocking = false; 4171 } 4172 4173 #ifdef ZERO 4174 // Clear flags not supported on zero. 4175 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4176 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4177 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4178 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4179 #endif // CC_INTERP 4180 4181 #ifdef COMPILER2 4182 if (!EliminateLocks) { 4183 EliminateNestedLocks = false; 4184 } 4185 if (!Inline) { 4186 IncrementalInline = false; 4187 } 4188 #ifndef PRODUCT 4189 if (!IncrementalInline) { 4190 AlwaysIncrementalInline = false; 4191 } 4192 #endif 4193 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 4194 // incremental inlining: bump MaxNodeLimit 4195 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 4196 } 4197 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4198 // nothing to use the profiling, turn if off 4199 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4200 } 4201 #endif 4202 4203 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4204 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4205 DebugNonSafepoints = true; 4206 } 4207 4208 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4209 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4210 } 4211 4212 if (UseOnStackReplacement && !UseLoopCounter) { 4213 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4214 FLAG_SET_DEFAULT(UseLoopCounter, true); 4215 } 4216 4217 #ifndef PRODUCT 4218 if (CompileTheWorld) { 4219 // Force NmethodSweeper to sweep whole CodeCache each time. 4220 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 4221 NmethodSweepFraction = 1; 4222 } 4223 } 4224 4225 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4226 if (use_vm_log()) { 4227 LogVMOutput = true; 4228 } 4229 } 4230 #endif // PRODUCT 4231 4232 if (PrintCommandLineFlags) { 4233 CommandLineFlags::printSetFlags(tty); 4234 } 4235 4236 // Apply CPU specific policy for the BiasedLocking 4237 if (UseBiasedLocking) { 4238 if (!VM_Version::use_biased_locking() && 4239 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4240 UseBiasedLocking = false; 4241 } 4242 } 4243 #ifdef COMPILER2 4244 if (!UseBiasedLocking || EmitSync != 0) { 4245 UseOptoBiasInlining = false; 4246 } 4247 #endif 4248 4249 // set PauseAtExit if the gamma launcher was used and a debugger is attached 4250 // but only if not already set on the commandline 4251 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 4252 bool set = false; 4253 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 4254 if (!set) { 4255 FLAG_SET_DEFAULT(PauseAtExit, true); 4256 } 4257 } 4258 4259 return JNI_OK; 4260 } 4261 4262 jint Arguments::adjust_after_os() { 4263 if (UseNUMA) { 4264 if (UseParallelGC || UseParallelOldGC) { 4265 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4266 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4267 } 4268 } 4269 // UseNUMAInterleaving is set to ON for all collectors and 4270 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4271 // such as the parallel collector for Linux and Solaris will 4272 // interleave old gen and survivor spaces on top of NUMA 4273 // allocation policy for the eden space. 4274 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4275 // all platforms and ParallelGC on Windows will interleave all 4276 // of the heap spaces across NUMA nodes. 4277 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4278 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4279 } 4280 } 4281 return JNI_OK; 4282 } 4283 4284 int Arguments::PropertyList_count(SystemProperty* pl) { 4285 int count = 0; 4286 while(pl != NULL) { 4287 count++; 4288 pl = pl->next(); 4289 } 4290 return count; 4291 } 4292 4293 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4294 assert(key != NULL, "just checking"); 4295 SystemProperty* prop; 4296 for (prop = pl; prop != NULL; prop = prop->next()) { 4297 if (strcmp(key, prop->key()) == 0) return prop->value(); 4298 } 4299 return NULL; 4300 } 4301 4302 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4303 int count = 0; 4304 const char* ret_val = NULL; 4305 4306 while(pl != NULL) { 4307 if(count >= index) { 4308 ret_val = pl->key(); 4309 break; 4310 } 4311 count++; 4312 pl = pl->next(); 4313 } 4314 4315 return ret_val; 4316 } 4317 4318 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4319 int count = 0; 4320 char* ret_val = NULL; 4321 4322 while(pl != NULL) { 4323 if(count >= index) { 4324 ret_val = pl->value(); 4325 break; 4326 } 4327 count++; 4328 pl = pl->next(); 4329 } 4330 4331 return ret_val; 4332 } 4333 4334 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4335 SystemProperty* p = *plist; 4336 if (p == NULL) { 4337 *plist = new_p; 4338 } else { 4339 while (p->next() != NULL) { 4340 p = p->next(); 4341 } 4342 p->set_next(new_p); 4343 } 4344 } 4345 4346 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4347 if (plist == NULL) 4348 return; 4349 4350 SystemProperty* new_p = new SystemProperty(k, v, true); 4351 PropertyList_add(plist, new_p); 4352 } 4353 4354 // This add maintains unique property key in the list. 4355 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4356 if (plist == NULL) 4357 return; 4358 4359 // If property key exist then update with new value. 4360 SystemProperty* prop; 4361 for (prop = *plist; prop != NULL; prop = prop->next()) { 4362 if (strcmp(k, prop->key()) == 0) { 4363 if (append) { 4364 prop->append_value(v); 4365 } else { 4366 prop->set_value(v); 4367 } 4368 return; 4369 } 4370 } 4371 4372 PropertyList_add(plist, k, v); 4373 } 4374 4375 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4376 // Returns true if all of the source pointed by src has been copied over to 4377 // the destination buffer pointed by buf. Otherwise, returns false. 4378 // Notes: 4379 // 1. If the length (buflen) of the destination buffer excluding the 4380 // NULL terminator character is not long enough for holding the expanded 4381 // pid characters, it also returns false instead of returning the partially 4382 // expanded one. 4383 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4384 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4385 char* buf, size_t buflen) { 4386 const char* p = src; 4387 char* b = buf; 4388 const char* src_end = &src[srclen]; 4389 char* buf_end = &buf[buflen - 1]; 4390 4391 while (p < src_end && b < buf_end) { 4392 if (*p == '%') { 4393 switch (*(++p)) { 4394 case '%': // "%%" ==> "%" 4395 *b++ = *p++; 4396 break; 4397 case 'p': { // "%p" ==> current process id 4398 // buf_end points to the character before the last character so 4399 // that we could write '\0' to the end of the buffer. 4400 size_t buf_sz = buf_end - b + 1; 4401 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4402 4403 // if jio_snprintf fails or the buffer is not long enough to hold 4404 // the expanded pid, returns false. 4405 if (ret < 0 || ret >= (int)buf_sz) { 4406 return false; 4407 } else { 4408 b += ret; 4409 assert(*b == '\0', "fail in copy_expand_pid"); 4410 if (p == src_end && b == buf_end + 1) { 4411 // reach the end of the buffer. 4412 return true; 4413 } 4414 } 4415 p++; 4416 break; 4417 } 4418 default : 4419 *b++ = '%'; 4420 } 4421 } else { 4422 *b++ = *p++; 4423 } 4424 } 4425 *b = '\0'; 4426 return (p == src_end); // return false if not all of the source was copied 4427 }