1 /* 2 * Copyright (c) 1997, 2015, 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/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "compiler/compilerOracle.hpp" 31 #include "memory/allocation.inline.hpp" 32 #include "memory/cardTableRS.hpp" 33 #include "memory/genCollectedHeap.hpp" 34 #include "memory/referenceProcessor.hpp" 35 #include "memory/universe.inline.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "prims/jvmtiExport.hpp" 38 #include "runtime/arguments.hpp" 39 #include "runtime/arguments_ext.hpp" 40 #include "runtime/globals_extension.hpp" 41 #include "runtime/java.hpp" 42 #include "runtime/os.hpp" 43 #include "runtime/vm_version.hpp" 44 #include "services/management.hpp" 45 #include "services/memTracker.hpp" 46 #include "utilities/defaultStream.hpp" 47 #include "utilities/macros.hpp" 48 #include "utilities/stringUtils.hpp" 49 #include "utilities/taskqueue.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 54 #endif // INCLUDE_ALL_GCS 55 56 // Note: This is a special bug reporting site for the JVM 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 58 #define DEFAULT_JAVA_LAUNCHER "generic" 59 60 // Disable options not supported in this release, with a warning if they 61 // were explicitly requested on the command-line 62 #define UNSUPPORTED_OPTION(opt, description) \ 63 do { \ 64 if (opt) { \ 65 if (FLAG_IS_CMDLINE(opt)) { \ 66 warning(description " is disabled in this release."); \ 67 } \ 68 FLAG_SET_DEFAULT(opt, false); \ 69 } \ 70 } while(0) 71 72 #define UNSUPPORTED_GC_OPTION(gc) \ 73 do { \ 74 if (gc) { \ 75 if (FLAG_IS_CMDLINE(gc)) { \ 76 warning(#gc " is not supported in this VM. Using Serial GC."); \ 77 } \ 78 FLAG_SET_DEFAULT(gc, false); \ 79 } \ 80 } while(0) 81 82 char** Arguments::_jvm_flags_array = NULL; 83 int Arguments::_num_jvm_flags = 0; 84 char** Arguments::_jvm_args_array = NULL; 85 int Arguments::_num_jvm_args = 0; 86 char* Arguments::_java_command = NULL; 87 SystemProperty* Arguments::_system_properties = NULL; 88 const char* Arguments::_gc_log_filename = NULL; 89 bool Arguments::_has_profile = false; 90 size_t Arguments::_conservative_max_heap_alignment = 0; 91 uintx Arguments::_min_heap_size = 0; 92 uintx Arguments::_min_heap_free_ratio = 0; 93 uintx Arguments::_max_heap_free_ratio = 0; 94 Arguments::Mode Arguments::_mode = _mixed; 95 bool Arguments::_java_compiler = false; 96 bool Arguments::_xdebug_mode = false; 97 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 99 int Arguments::_sun_java_launcher_pid = -1; 100 bool Arguments::_sun_java_launcher_is_altjvm = false; 101 102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 105 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 106 bool Arguments::_ClipInlining = ClipInlining; 107 108 char* Arguments::SharedArchivePath = NULL; 109 110 AgentLibraryList Arguments::_libraryList; 111 AgentLibraryList Arguments::_agentList; 112 113 abort_hook_t Arguments::_abort_hook = NULL; 114 exit_hook_t Arguments::_exit_hook = NULL; 115 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 116 117 118 SystemProperty *Arguments::_sun_boot_library_path = NULL; 119 SystemProperty *Arguments::_java_library_path = NULL; 120 SystemProperty *Arguments::_java_home = NULL; 121 SystemProperty *Arguments::_java_class_path = NULL; 122 SystemProperty *Arguments::_sun_boot_class_path = NULL; 123 124 char* Arguments::_meta_index_path = NULL; 125 char* Arguments::_meta_index_dir = NULL; 126 char* Arguments::_ext_dirs = NULL; 127 128 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 129 // part of the option string. 130 static bool match_option(const JavaVMOption *option, const char* name, 131 const char** tail) { 132 int len = (int)strlen(name); 133 if (strncmp(option->optionString, name, len) == 0) { 134 *tail = option->optionString + len; 135 return true; 136 } else { 137 return false; 138 } 139 } 140 141 // Check if 'option' matches 'name'. No "tail" is allowed. 142 static bool match_option(const JavaVMOption *option, const char* name) { 143 const char* tail = NULL; 144 bool result = match_option(option, name, &tail); 145 if (tail != NULL && *tail == '\0') { 146 return result; 147 } else { 148 return false; 149 } 150 } 151 152 // Return true if any of the strings in null-terminated array 'names' matches. 153 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 154 // the option must match exactly. 155 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 156 bool tail_allowed) { 157 for (/* empty */; *names != NULL; ++names) { 158 if (match_option(option, *names, tail)) { 159 if (**tail == '\0' || tail_allowed && **tail == ':') { 160 return true; 161 } 162 } 163 } 164 return false; 165 } 166 167 static void logOption(const char* opt) { 168 if (PrintVMOptions) { 169 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 170 } 171 } 172 173 // Process java launcher properties. 174 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 175 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 176 // sun.java.launcher.pid is defined. 177 // Must do this before setting up other system properties, 178 // as some of them may depend on launcher type. 179 for (int index = 0; index < args->nOptions; index++) { 180 const JavaVMOption* option = args->options + index; 181 const char* tail; 182 183 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 184 process_java_launcher_argument(tail, option->extraInfo); 185 continue; 186 } 187 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 188 if (strcmp(tail, "true") == 0) { 189 _sun_java_launcher_is_altjvm = true; 190 } 191 continue; 192 } 193 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 194 _sun_java_launcher_pid = atoi(tail); 195 continue; 196 } 197 } 198 } 199 200 // Initialize system properties key and value. 201 void Arguments::init_system_properties() { 202 203 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 204 "Java Virtual Machine Specification", false)); 205 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 206 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 207 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 208 209 // Following are JVMTI agent writable properties. 210 // Properties values are set to NULL and they are 211 // os specific they are initialized in os::init_system_properties_values(). 212 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 213 _java_library_path = new SystemProperty("java.library.path", NULL, true); 214 _java_home = new SystemProperty("java.home", NULL, true); 215 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 216 217 _java_class_path = new SystemProperty("java.class.path", "", true); 218 219 // Add to System Property list. 220 PropertyList_add(&_system_properties, _sun_boot_library_path); 221 PropertyList_add(&_system_properties, _java_library_path); 222 PropertyList_add(&_system_properties, _java_home); 223 PropertyList_add(&_system_properties, _java_class_path); 224 PropertyList_add(&_system_properties, _sun_boot_class_path); 225 226 // Set OS specific system properties values 227 os::init_system_properties_values(); 228 } 229 230 231 // Update/Initialize System properties after JDK version number is known 232 void Arguments::init_version_specific_system_properties() { 233 enum { bufsz = 16 }; 234 char buffer[bufsz]; 235 const char* spec_vendor = "Sun Microsystems Inc."; 236 uint32_t spec_version = 0; 237 238 spec_vendor = "Oracle Corporation"; 239 spec_version = JDK_Version::current().major_version(); 240 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 241 242 PropertyList_add(&_system_properties, 243 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 244 PropertyList_add(&_system_properties, 245 new SystemProperty("java.vm.specification.version", buffer, false)); 246 PropertyList_add(&_system_properties, 247 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 248 } 249 250 /** 251 * Provide a slightly more user-friendly way of eliminating -XX flags. 252 * When a flag is eliminated, it can be added to this list in order to 253 * continue accepting this flag on the command-line, while issuing a warning 254 * and ignoring the value. Once the JDK version reaches the 'accept_until' 255 * limit, we flatly refuse to admit the existence of the flag. This allows 256 * a flag to die correctly over JDK releases using HSX. 257 */ 258 typedef struct { 259 const char* name; 260 JDK_Version obsoleted_in; // when the flag went away 261 JDK_Version accept_until; // which version to start denying the existence 262 } ObsoleteFlag; 263 264 static ObsoleteFlag obsolete_jvm_flags[] = { 265 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 266 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 267 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 268 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 269 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 270 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 271 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 272 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 273 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 274 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 275 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 276 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 277 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 278 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 279 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 280 { "DefaultInitialRAMFraction", 281 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 282 { "UseDepthFirstScavengeOrder", 283 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 284 { "HandlePromotionFailure", 285 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 286 { "MaxLiveObjectEvacuationRatio", 287 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 288 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 289 { "UseParallelOldGCCompacting", 290 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 291 { "UseParallelDensePrefixUpdate", 292 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 293 { "UseParallelOldGCDensePrefix", 294 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 295 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 296 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 297 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 302 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 303 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 304 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 305 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 306 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 307 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 308 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 309 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 310 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 311 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 312 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 313 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 314 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 315 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 316 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 317 #ifdef PRODUCT 318 { "DesiredMethodLimit", 319 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 320 #endif // PRODUCT 321 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 322 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 323 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 324 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 325 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 326 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 327 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 328 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 329 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 330 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 331 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 332 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 333 #ifndef ZERO 334 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 335 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 336 #endif // ZERO 337 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 338 { NULL, JDK_Version(0), JDK_Version(0) } 339 }; 340 341 // Returns true if the flag is obsolete and fits into the range specified 342 // for being ignored. In the case that the flag is ignored, the 'version' 343 // value is filled in with the version number when the flag became 344 // obsolete so that that value can be displayed to the user. 345 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 346 int i = 0; 347 assert(version != NULL, "Must provide a version buffer"); 348 while (obsolete_jvm_flags[i].name != NULL) { 349 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 350 // <flag>=xxx form 351 // [-|+]<flag> form 352 size_t len = strlen(flag_status.name); 353 if (((strncmp(flag_status.name, s, len) == 0) && 354 (strlen(s) == len)) || 355 ((s[0] == '+' || s[0] == '-') && 356 (strncmp(flag_status.name, &s[1], len) == 0) && 357 (strlen(&s[1]) == len))) { 358 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 359 *version = flag_status.obsoleted_in; 360 return true; 361 } 362 } 363 i++; 364 } 365 return false; 366 } 367 368 // Constructs the system class path (aka boot class path) from the following 369 // components, in order: 370 // 371 // prefix // from -Xbootclasspath/p:... 372 // base // from os::get_system_properties() or -Xbootclasspath= 373 // suffix // from -Xbootclasspath/a:... 374 // 375 // This could be AllStatic, but it isn't needed after argument processing is 376 // complete. 377 class SysClassPath: public StackObj { 378 public: 379 SysClassPath(const char* base); 380 ~SysClassPath(); 381 382 inline void set_base(const char* base); 383 inline void add_prefix(const char* prefix); 384 inline void add_suffix_to_prefix(const char* suffix); 385 inline void add_suffix(const char* suffix); 386 inline void reset_path(const char* base); 387 388 inline const char* get_base() const { return _items[_scp_base]; } 389 inline const char* get_prefix() const { return _items[_scp_prefix]; } 390 inline const char* get_suffix() const { return _items[_scp_suffix]; } 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_base, // the default sysclasspath 408 _scp_suffix, // from -Xbootclasspath/a:... 409 _scp_nitems // the number of items, must be last. 410 }; 411 412 const char* _items[_scp_nitems]; 413 }; 414 415 SysClassPath::SysClassPath(const char* base) { 416 memset(_items, 0, sizeof(_items)); 417 _items[_scp_base] = base; 418 } 419 420 SysClassPath::~SysClassPath() { 421 // Free everything except the base. 422 for (int i = 0; i < _scp_nitems; ++i) { 423 if (i != _scp_base) reset_item_at(i); 424 } 425 } 426 427 inline void SysClassPath::set_base(const char* base) { 428 _items[_scp_base] = base; 429 } 430 431 inline void SysClassPath::add_prefix(const char* prefix) { 432 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 433 } 434 435 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 436 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 437 } 438 439 inline void SysClassPath::add_suffix(const char* suffix) { 440 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 441 } 442 443 inline void SysClassPath::reset_item_at(int index) { 444 assert(index < _scp_nitems && index != _scp_base, "just checking"); 445 if (_items[index] != NULL) { 446 FREE_C_HEAP_ARRAY(char, _items[index]); 447 _items[index] = NULL; 448 } 449 } 450 451 inline void SysClassPath::reset_path(const char* base) { 452 // Clear the prefix and suffix. 453 reset_item_at(_scp_prefix); 454 reset_item_at(_scp_suffix); 455 set_base(base); 456 } 457 458 //------------------------------------------------------------------------------ 459 460 461 // Combine the bootclasspath elements, some of which may be null, into a single 462 // c-heap-allocated string. 463 char* SysClassPath::combined_path() { 464 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 465 466 size_t lengths[_scp_nitems]; 467 size_t total_len = 0; 468 469 const char separator = *os::path_separator(); 470 471 // Get the lengths. 472 int i; 473 for (i = 0; i < _scp_nitems; ++i) { 474 if (_items[i] != NULL) { 475 lengths[i] = strlen(_items[i]); 476 // Include space for the separator char (or a NULL for the last item). 477 total_len += lengths[i] + 1; 478 } 479 } 480 assert(total_len > 0, "empty sysclasspath not allowed"); 481 482 // Copy the _items to a single string. 483 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 484 char* cp_tmp = cp; 485 for (i = 0; i < _scp_nitems; ++i) { 486 if (_items[i] != NULL) { 487 memcpy(cp_tmp, _items[i], lengths[i]); 488 cp_tmp += lengths[i]; 489 *cp_tmp++ = separator; 490 } 491 } 492 *--cp_tmp = '\0'; // Replace the extra separator. 493 return cp; 494 } 495 496 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 497 char* 498 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 499 char *cp; 500 501 assert(str != NULL, "just checking"); 502 if (path == NULL) { 503 size_t len = strlen(str) + 1; 504 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 505 memcpy(cp, str, len); // copy the trailing null 506 } else { 507 const char separator = *os::path_separator(); 508 size_t old_len = strlen(path); 509 size_t str_len = strlen(str); 510 size_t len = old_len + str_len + 2; 511 512 if (prepend) { 513 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 514 char* cp_tmp = cp; 515 memcpy(cp_tmp, str, str_len); 516 cp_tmp += str_len; 517 *cp_tmp = separator; 518 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 519 FREE_C_HEAP_ARRAY(char, path); 520 } else { 521 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 522 char* cp_tmp = cp + old_len; 523 *cp_tmp = separator; 524 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 525 } 526 } 527 return cp; 528 } 529 530 // Scan the directory and append any jar or zip files found to path. 531 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 532 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 533 DIR* dir = os::opendir(directory); 534 if (dir == NULL) return path; 535 536 char dir_sep[2] = { '\0', '\0' }; 537 size_t directory_len = strlen(directory); 538 const char fileSep = *os::file_separator(); 539 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 540 541 /* Scan the directory for jars/zips, appending them to path. */ 542 struct dirent *entry; 543 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 544 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 545 const char* name = entry->d_name; 546 const char* ext = name + strlen(name) - 4; 547 bool isJarOrZip = ext > name && 548 (os::file_name_strcmp(ext, ".jar") == 0 || 549 os::file_name_strcmp(ext, ".zip") == 0); 550 if (isJarOrZip) { 551 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 552 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 553 path = add_to_path(path, jarpath, false); 554 FREE_C_HEAP_ARRAY(char, jarpath); 555 } 556 } 557 FREE_C_HEAP_ARRAY(char, dbuf); 558 os::closedir(dir); 559 return path; 560 } 561 562 // Parses a memory size specification string. 563 static bool atomull(const char *s, julong* result) { 564 julong n = 0; 565 int args_read = 0; 566 bool is_hex = false; 567 // Skip leading 0[xX] for hexadecimal 568 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 569 s += 2; 570 is_hex = true; 571 args_read = sscanf(s, JULONG_FORMAT_X, &n); 572 } else { 573 args_read = sscanf(s, JULONG_FORMAT, &n); 574 } 575 if (args_read != 1) { 576 return false; 577 } 578 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 579 s++; 580 } 581 // 4705540: illegal if more characters are found after the first non-digit 582 if (strlen(s) > 1) { 583 return false; 584 } 585 switch (*s) { 586 case 'T': case 't': 587 *result = n * G * K; 588 // Check for overflow. 589 if (*result/((julong)G * K) != n) return false; 590 return true; 591 case 'G': case 'g': 592 *result = n * G; 593 if (*result/G != n) return false; 594 return true; 595 case 'M': case 'm': 596 *result = n * M; 597 if (*result/M != n) return false; 598 return true; 599 case 'K': case 'k': 600 *result = n * K; 601 if (*result/K != n) return false; 602 return true; 603 case '\0': 604 *result = n; 605 return true; 606 default: 607 return false; 608 } 609 } 610 611 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 612 if (size < min_size) return arg_too_small; 613 // Check that size will fit in a size_t (only relevant on 32-bit) 614 if (size > max_uintx) return arg_too_big; 615 return arg_in_range; 616 } 617 618 // Describe an argument out of range error 619 void Arguments::describe_range_error(ArgsRange errcode) { 620 switch(errcode) { 621 case arg_too_big: 622 jio_fprintf(defaultStream::error_stream(), 623 "The specified size exceeds the maximum " 624 "representable size.\n"); 625 break; 626 case arg_too_small: 627 case arg_unreadable: 628 case arg_in_range: 629 // do nothing for now 630 break; 631 default: 632 ShouldNotReachHere(); 633 } 634 } 635 636 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 637 return CommandLineFlags::boolAtPut(name, &value, origin); 638 } 639 640 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 641 double v; 642 if (sscanf(value, "%lf", &v) != 1) { 643 return false; 644 } 645 646 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 647 return true; 648 } 649 return false; 650 } 651 652 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 653 julong v; 654 intx intx_v; 655 bool is_neg = false; 656 // Check the sign first since atomull() parses only unsigned values. 657 if (*value == '-') { 658 if (!CommandLineFlags::intxAt(name, &intx_v)) { 659 return false; 660 } 661 value++; 662 is_neg = true; 663 } 664 if (!atomull(value, &v)) { 665 return false; 666 } 667 intx_v = (intx) v; 668 if (is_neg) { 669 intx_v = -intx_v; 670 } 671 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 672 return true; 673 } 674 uintx uintx_v = (uintx) v; 675 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 676 return true; 677 } 678 uint64_t uint64_t_v = (uint64_t) v; 679 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 680 return true; 681 } 682 size_t size_t_v = (size_t) v; 683 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 684 return true; 685 } 686 return false; 687 } 688 689 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 690 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 691 // Contract: CommandLineFlags always returns a pointer that needs freeing. 692 FREE_C_HEAP_ARRAY(char, value); 693 return true; 694 } 695 696 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 697 const char* old_value = ""; 698 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 699 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 700 size_t new_len = strlen(new_value); 701 const char* value; 702 char* free_this_too = NULL; 703 if (old_len == 0) { 704 value = new_value; 705 } else if (new_len == 0) { 706 value = old_value; 707 } else { 708 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 709 // each new setting adds another LINE to the switch: 710 sprintf(buf, "%s\n%s", old_value, new_value); 711 value = buf; 712 free_this_too = buf; 713 } 714 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 715 // CommandLineFlags always returns a pointer that needs freeing. 716 FREE_C_HEAP_ARRAY(char, value); 717 if (free_this_too != NULL) { 718 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 719 FREE_C_HEAP_ARRAY(char, free_this_too); 720 } 721 return true; 722 } 723 724 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 725 726 // range of acceptable characters spelled out for portability reasons 727 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 728 #define BUFLEN 255 729 char name[BUFLEN+1]; 730 char dummy; 731 732 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 733 return set_bool_flag(name, false, origin); 734 } 735 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 736 return set_bool_flag(name, true, origin); 737 } 738 739 char punct; 740 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 741 const char* value = strchr(arg, '=') + 1; 742 Flag* flag = Flag::find_flag(name, strlen(name)); 743 if (flag != NULL && flag->is_ccstr()) { 744 if (flag->ccstr_accumulates()) { 745 return append_to_string_flag(name, value, origin); 746 } else { 747 if (value[0] == '\0') { 748 value = NULL; 749 } 750 return set_string_flag(name, value, origin); 751 } 752 } 753 } 754 755 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 756 const char* value = strchr(arg, '=') + 1; 757 // -XX:Foo:=xxx will reset the string flag to the given value. 758 if (value[0] == '\0') { 759 value = NULL; 760 } 761 return set_string_flag(name, value, origin); 762 } 763 764 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 765 #define SIGNED_NUMBER_RANGE "[-0123456789]" 766 #define NUMBER_RANGE "[0123456789]" 767 char value[BUFLEN + 1]; 768 char value2[BUFLEN + 1]; 769 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 770 // Looks like a floating-point number -- try again with more lenient format string 771 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 772 return set_fp_numeric_flag(name, value, origin); 773 } 774 } 775 776 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 777 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 778 return set_numeric_flag(name, value, origin); 779 } 780 781 return false; 782 } 783 784 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 785 assert(bldarray != NULL, "illegal argument"); 786 787 if (arg == NULL) { 788 return; 789 } 790 791 int new_count = *count + 1; 792 793 // expand the array and add arg to the last element 794 if (*bldarray == NULL) { 795 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 796 } else { 797 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 798 } 799 (*bldarray)[*count] = os::strdup_check_oom(arg); 800 *count = new_count; 801 } 802 803 void Arguments::build_jvm_args(const char* arg) { 804 add_string(&_jvm_args_array, &_num_jvm_args, arg); 805 } 806 807 void Arguments::build_jvm_flags(const char* arg) { 808 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 809 } 810 811 // utility function to return a string that concatenates all 812 // strings in a given char** array 813 const char* Arguments::build_resource_string(char** args, int count) { 814 if (args == NULL || count == 0) { 815 return NULL; 816 } 817 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 818 for (int i = 1; i < count; i++) { 819 length += strlen(args[i]) + 1; // add 1 for a space 820 } 821 char* s = NEW_RESOURCE_ARRAY(char, length); 822 strcpy(s, args[0]); 823 for (int j = 1; j < count; j++) { 824 strcat(s, " "); 825 strcat(s, args[j]); 826 } 827 return (const char*) s; 828 } 829 830 void Arguments::print_on(outputStream* st) { 831 st->print_cr("VM Arguments:"); 832 if (num_jvm_flags() > 0) { 833 st->print("jvm_flags: "); print_jvm_flags_on(st); 834 } 835 if (num_jvm_args() > 0) { 836 st->print("jvm_args: "); print_jvm_args_on(st); 837 } 838 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 839 if (_java_class_path != NULL) { 840 char* path = _java_class_path->value(); 841 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 842 } 843 st->print_cr("Launcher Type: %s", _sun_java_launcher); 844 } 845 846 void Arguments::print_jvm_flags_on(outputStream* st) { 847 if (_num_jvm_flags > 0) { 848 for (int i=0; i < _num_jvm_flags; i++) { 849 st->print("%s ", _jvm_flags_array[i]); 850 } 851 st->cr(); 852 } 853 } 854 855 void Arguments::print_jvm_args_on(outputStream* st) { 856 if (_num_jvm_args > 0) { 857 for (int i=0; i < _num_jvm_args; i++) { 858 st->print("%s ", _jvm_args_array[i]); 859 } 860 st->cr(); 861 } 862 } 863 864 bool Arguments::process_argument(const char* arg, 865 jboolean ignore_unrecognized, Flag::Flags origin) { 866 867 JDK_Version since = JDK_Version(); 868 869 if (parse_argument(arg, origin) || ignore_unrecognized) { 870 return true; 871 } 872 873 bool has_plus_minus = (*arg == '+' || *arg == '-'); 874 const char* const argname = has_plus_minus ? arg + 1 : arg; 875 if (is_newly_obsolete(arg, &since)) { 876 char version[256]; 877 since.to_string(version, sizeof(version)); 878 warning("ignoring option %s; support was removed in %s", argname, version); 879 return true; 880 } 881 882 // For locked flags, report a custom error message if available. 883 // Otherwise, report the standard unrecognized VM option. 884 885 size_t arg_len; 886 const char* equal_sign = strchr(argname, '='); 887 if (equal_sign == NULL) { 888 arg_len = strlen(argname); 889 } else { 890 arg_len = equal_sign - argname; 891 } 892 893 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 894 if (found_flag != NULL) { 895 char locked_message_buf[BUFLEN]; 896 found_flag->get_locked_message(locked_message_buf, BUFLEN); 897 if (strlen(locked_message_buf) == 0) { 898 if (found_flag->is_bool() && !has_plus_minus) { 899 jio_fprintf(defaultStream::error_stream(), 900 "Missing +/- setting for VM option '%s'\n", argname); 901 } else if (!found_flag->is_bool() && has_plus_minus) { 902 jio_fprintf(defaultStream::error_stream(), 903 "Unexpected +/- setting in VM option '%s'\n", argname); 904 } else { 905 jio_fprintf(defaultStream::error_stream(), 906 "Improperly specified VM option '%s'\n", argname); 907 } 908 } else { 909 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 910 } 911 } else { 912 jio_fprintf(defaultStream::error_stream(), 913 "Unrecognized VM option '%s'\n", argname); 914 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 915 if (fuzzy_matched != NULL) { 916 jio_fprintf(defaultStream::error_stream(), 917 "Did you mean '%s%s%s'? ", 918 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 919 fuzzy_matched->_name, 920 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 921 if (is_newly_obsolete(fuzzy_matched->_name, &since)) { 922 char version[256]; 923 since.to_string(version, sizeof(version)); 924 jio_fprintf(defaultStream::error_stream(), 925 "Warning: support for %s was removed in %s\n", 926 fuzzy_matched->_name, 927 version); 928 } 929 } 930 } 931 932 // allow for commandline "commenting out" options like -XX:#+Verbose 933 return arg[0] == '#'; 934 } 935 936 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 937 FILE* stream = fopen(file_name, "rb"); 938 if (stream == NULL) { 939 if (should_exist) { 940 jio_fprintf(defaultStream::error_stream(), 941 "Could not open settings file %s\n", file_name); 942 return false; 943 } else { 944 return true; 945 } 946 } 947 948 char token[1024]; 949 int pos = 0; 950 951 bool in_white_space = true; 952 bool in_comment = false; 953 bool in_quote = false; 954 char quote_c = 0; 955 bool result = true; 956 957 int c = getc(stream); 958 while(c != EOF && pos < (int)(sizeof(token)-1)) { 959 if (in_white_space) { 960 if (in_comment) { 961 if (c == '\n') in_comment = false; 962 } else { 963 if (c == '#') in_comment = true; 964 else if (!isspace(c)) { 965 in_white_space = false; 966 token[pos++] = c; 967 } 968 } 969 } else { 970 if (c == '\n' || (!in_quote && isspace(c))) { 971 // token ends at newline, or at unquoted whitespace 972 // this allows a way to include spaces in string-valued options 973 token[pos] = '\0'; 974 logOption(token); 975 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 976 build_jvm_flags(token); 977 pos = 0; 978 in_white_space = true; 979 in_quote = false; 980 } else if (!in_quote && (c == '\'' || c == '"')) { 981 in_quote = true; 982 quote_c = c; 983 } else if (in_quote && (c == quote_c)) { 984 in_quote = false; 985 } else { 986 token[pos++] = c; 987 } 988 } 989 c = getc(stream); 990 } 991 if (pos > 0) { 992 token[pos] = '\0'; 993 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 994 build_jvm_flags(token); 995 } 996 fclose(stream); 997 return result; 998 } 999 1000 //============================================================================================================= 1001 // Parsing of properties (-D) 1002 1003 const char* Arguments::get_property(const char* key) { 1004 return PropertyList_get_value(system_properties(), key); 1005 } 1006 1007 bool Arguments::add_property(const char* prop) { 1008 const char* eq = strchr(prop, '='); 1009 char* key; 1010 // ns must be static--its address may be stored in a SystemProperty object. 1011 const static char ns[1] = {0}; 1012 char* value = (char *)ns; 1013 1014 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1015 key = AllocateHeap(key_len + 1, mtInternal); 1016 strncpy(key, prop, key_len); 1017 key[key_len] = '\0'; 1018 1019 if (eq != NULL) { 1020 size_t value_len = strlen(prop) - key_len - 1; 1021 value = AllocateHeap(value_len + 1, mtInternal); 1022 strncpy(value, &prop[key_len + 1], value_len + 1); 1023 } 1024 1025 if (strcmp(key, "java.compiler") == 0) { 1026 process_java_compiler_argument(value); 1027 FreeHeap(key); 1028 if (eq != NULL) { 1029 FreeHeap(value); 1030 } 1031 return true; 1032 } else if (strcmp(key, "sun.java.command") == 0) { 1033 _java_command = value; 1034 1035 // Record value in Arguments, but let it get passed to Java. 1036 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1037 strcmp(key, "sun.java.launcher.pid") == 0) { 1038 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1039 // private and are processed in process_sun_java_launcher_properties(); 1040 // the sun.java.launcher property is passed on to the java application 1041 FreeHeap(key); 1042 if (eq != NULL) { 1043 FreeHeap(value); 1044 } 1045 return true; 1046 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1047 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1048 // its value without going through the property list or making a Java call. 1049 _java_vendor_url_bug = value; 1050 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1051 PropertyList_unique_add(&_system_properties, key, value, true); 1052 return true; 1053 } 1054 // Create new property and add at the end of the list 1055 PropertyList_unique_add(&_system_properties, key, value); 1056 return true; 1057 } 1058 1059 //=========================================================================================================== 1060 // Setting int/mixed/comp mode flags 1061 1062 void Arguments::set_mode_flags(Mode mode) { 1063 // Set up default values for all flags. 1064 // If you add a flag to any of the branches below, 1065 // add a default value for it here. 1066 set_java_compiler(false); 1067 _mode = mode; 1068 1069 // Ensure Agent_OnLoad has the correct initial values. 1070 // This may not be the final mode; mode may change later in onload phase. 1071 PropertyList_unique_add(&_system_properties, "java.vm.info", 1072 (char*)VM_Version::vm_info_string(), false); 1073 1074 UseInterpreter = true; 1075 UseCompiler = true; 1076 UseLoopCounter = true; 1077 1078 // Default values may be platform/compiler dependent - 1079 // use the saved values 1080 ClipInlining = Arguments::_ClipInlining; 1081 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1082 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1083 BackgroundCompilation = Arguments::_BackgroundCompilation; 1084 1085 // Change from defaults based on mode 1086 switch (mode) { 1087 default: 1088 ShouldNotReachHere(); 1089 break; 1090 case _int: 1091 UseCompiler = false; 1092 UseLoopCounter = false; 1093 AlwaysCompileLoopMethods = false; 1094 UseOnStackReplacement = false; 1095 break; 1096 case _mixed: 1097 // same as default 1098 break; 1099 case _comp: 1100 UseInterpreter = false; 1101 BackgroundCompilation = false; 1102 ClipInlining = false; 1103 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1104 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1105 // compile a level 4 (C2) and then continue executing it. 1106 if (TieredCompilation) { 1107 Tier3InvokeNotifyFreqLog = 0; 1108 Tier4InvocationThreshold = 0; 1109 } 1110 break; 1111 } 1112 } 1113 1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1115 // Conflict: required to use shared spaces (-Xshare:on), but 1116 // incompatible command line options were chosen. 1117 1118 static void no_shared_spaces(const char* message) { 1119 if (RequireSharedSpaces) { 1120 jio_fprintf(defaultStream::error_stream(), 1121 "Class data sharing is inconsistent with other specified options.\n"); 1122 vm_exit_during_initialization("Unable to use shared archive.", message); 1123 } else { 1124 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1125 } 1126 } 1127 #endif 1128 1129 // Returns threshold scaled with CompileThresholdScaling 1130 intx Arguments::get_scaled_compile_threshold(intx threshold) { 1131 return (intx)(threshold * CompileThresholdScaling); 1132 } 1133 1134 // Returns freq_log scaled with CompileThresholdScaling 1135 intx Arguments::get_scaled_freq_log(intx freq_log) { 1136 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log); 1137 if (scaled_freq == 0) { 1138 return 0; 1139 } else { 1140 return log2_intptr(scaled_freq); 1141 } 1142 } 1143 1144 void Arguments::set_tiered_flags() { 1145 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1146 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1147 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1148 } 1149 if (CompilationPolicyChoice < 2) { 1150 vm_exit_during_initialization( 1151 "Incompatible compilation policy selected", NULL); 1152 } 1153 // Increase the code cache size - tiered compiles a lot more. 1154 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1155 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1156 } 1157 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1158 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1159 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1160 1161 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1162 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1163 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1164 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1165 } 1166 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1167 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1168 } 1169 // Check consistency of code heap sizes 1170 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1171 jio_fprintf(defaultStream::error_stream(), 1172 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1173 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1174 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1175 vm_exit(1); 1176 } 1177 } 1178 } 1179 if (!UseInterpreter) { // -Xcomp 1180 Tier3InvokeNotifyFreqLog = 0; 1181 Tier4InvocationThreshold = 0; 1182 } 1183 // Scale tiered compilation thresholds 1184 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { 1185 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1186 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1187 1188 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold)); 1189 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold)); 1190 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold)); 1191 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold)); 1192 1193 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1194 // once these thresholds become supported. 1195 1196 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1197 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1198 1199 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1200 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1201 1202 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1203 1204 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold)); 1205 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold)); 1206 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold)); 1207 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold)); 1208 } 1209 } 1210 1211 /** 1212 * Returns the minimum number of compiler threads needed to run the JVM. The following 1213 * configurations are possible. 1214 * 1215 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1216 * compiler threads is 0. 1217 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1218 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1219 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1220 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1221 * C1 can be used, so the minimum number of compiler threads is 1. 1222 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1223 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1224 * the minimum number of compiler threads is 2. 1225 */ 1226 int Arguments::get_min_number_of_compiler_threads() { 1227 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1228 return 0; // case 1 1229 #else 1230 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1231 return 1; // case 2 or case 3 1232 } 1233 return 2; // case 4 (tiered) 1234 #endif 1235 } 1236 1237 #if INCLUDE_ALL_GCS 1238 static void disable_adaptive_size_policy(const char* collector_name) { 1239 if (UseAdaptiveSizePolicy) { 1240 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1241 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1242 collector_name); 1243 } 1244 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1245 } 1246 } 1247 1248 void Arguments::set_parnew_gc_flags() { 1249 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1250 "control point invariant"); 1251 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1252 assert(UseParNewGC, "ParNew should always be used with CMS"); 1253 1254 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1255 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1256 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1257 } else if (ParallelGCThreads == 0) { 1258 jio_fprintf(defaultStream::error_stream(), 1259 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1260 vm_exit(1); 1261 } 1262 1263 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1264 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1265 // we set them to 1024 and 1024. 1266 // See CR 6362902. 1267 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1268 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1269 } 1270 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1271 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1272 } 1273 1274 // When using compressed oops, we use local overflow stacks, 1275 // rather than using a global overflow list chained through 1276 // the klass word of the object's pre-image. 1277 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1278 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1279 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1280 } 1281 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1282 } 1283 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1284 } 1285 1286 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1287 // sparc/solaris for certain applications, but would gain from 1288 // further optimization and tuning efforts, and would almost 1289 // certainly gain from analysis of platform and environment. 1290 void Arguments::set_cms_and_parnew_gc_flags() { 1291 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1292 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1293 assert(UseParNewGC, "ParNew should always be used with CMS"); 1294 1295 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1296 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1297 1298 set_parnew_gc_flags(); 1299 1300 size_t max_heap = align_size_down(MaxHeapSize, 1301 CardTableRS::ct_max_alignment_constraint()); 1302 1303 // Now make adjustments for CMS 1304 intx tenuring_default = (intx)6; 1305 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1306 1307 // Preferred young gen size for "short" pauses: 1308 // upper bound depends on # of threads and NewRatio. 1309 const uintx parallel_gc_threads = 1310 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1311 const size_t preferred_max_new_size_unaligned = 1312 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1313 size_t preferred_max_new_size = 1314 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1315 1316 // Unless explicitly requested otherwise, size young gen 1317 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1318 1319 // If either MaxNewSize or NewRatio is set on the command line, 1320 // assume the user is trying to set the size of the young gen. 1321 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1322 1323 // Set MaxNewSize to our calculated preferred_max_new_size unless 1324 // NewSize was set on the command line and it is larger than 1325 // preferred_max_new_size. 1326 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1327 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1328 } else { 1329 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1330 } 1331 if (PrintGCDetails && Verbose) { 1332 // Too early to use gclog_or_tty 1333 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1334 } 1335 1336 // Code along this path potentially sets NewSize and OldSize 1337 if (PrintGCDetails && Verbose) { 1338 // Too early to use gclog_or_tty 1339 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1340 " initial_heap_size: " SIZE_FORMAT 1341 " max_heap: " SIZE_FORMAT, 1342 min_heap_size(), InitialHeapSize, max_heap); 1343 } 1344 size_t min_new = preferred_max_new_size; 1345 if (FLAG_IS_CMDLINE(NewSize)) { 1346 min_new = NewSize; 1347 } 1348 if (max_heap > min_new && min_heap_size() > min_new) { 1349 // Unless explicitly requested otherwise, make young gen 1350 // at least min_new, and at most preferred_max_new_size. 1351 if (FLAG_IS_DEFAULT(NewSize)) { 1352 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1353 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1354 if (PrintGCDetails && Verbose) { 1355 // Too early to use gclog_or_tty 1356 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1357 } 1358 } 1359 // Unless explicitly requested otherwise, size old gen 1360 // so it's NewRatio x of NewSize. 1361 if (FLAG_IS_DEFAULT(OldSize)) { 1362 if (max_heap > NewSize) { 1363 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1364 if (PrintGCDetails && Verbose) { 1365 // Too early to use gclog_or_tty 1366 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1367 } 1368 } 1369 } 1370 } 1371 } 1372 // Unless explicitly requested otherwise, definitely 1373 // promote all objects surviving "tenuring_default" scavenges. 1374 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1375 FLAG_IS_DEFAULT(SurvivorRatio)) { 1376 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1377 } 1378 // If we decided above (or user explicitly requested) 1379 // `promote all' (via MaxTenuringThreshold := 0), 1380 // prefer minuscule survivor spaces so as not to waste 1381 // space for (non-existent) survivors 1382 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1383 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1384 } 1385 1386 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1387 // but rather the number of free blocks of a given size that are used when 1388 // replenishing the local per-worker free list caches. 1389 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1390 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1391 // OldPLAB sizing manually turned off: Use a larger default setting, 1392 // unless it was manually specified. This is because a too-low value 1393 // will slow down scavenges. 1394 FLAG_SET_ERGO(uintx, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1395 } else { 1396 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1397 } 1398 } 1399 1400 // If either of the static initialization defaults have changed, note this 1401 // modification. 1402 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1403 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 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 } else { 1526 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1527 warning("Max heap size too large for Compressed Oops"); 1528 FLAG_SET_DEFAULT(UseCompressedOops, false); 1529 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1530 } 1531 } 1532 #endif // _LP64 1533 #endif // ZERO 1534 } 1535 1536 1537 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1538 // set_use_compressed_oops(). 1539 void Arguments::set_use_compressed_klass_ptrs() { 1540 #ifndef ZERO 1541 #ifdef _LP64 1542 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1543 if (!UseCompressedOops) { 1544 if (UseCompressedClassPointers) { 1545 warning("UseCompressedClassPointers requires UseCompressedOops"); 1546 } 1547 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1548 } else { 1549 // Turn on UseCompressedClassPointers too 1550 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1551 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1552 } 1553 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1554 if (UseCompressedClassPointers) { 1555 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1556 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1557 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1558 } 1559 } 1560 } 1561 #endif // _LP64 1562 #endif // !ZERO 1563 } 1564 1565 void Arguments::set_conservative_max_heap_alignment() { 1566 // The conservative maximum required alignment for the heap is the maximum of 1567 // the alignments imposed by several sources: any requirements from the heap 1568 // itself, the collector policy and the maximum page size we may run the VM 1569 // with. 1570 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1571 #if INCLUDE_ALL_GCS 1572 if (UseParallelGC) { 1573 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1574 } else if (UseG1GC) { 1575 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1576 } 1577 #endif // INCLUDE_ALL_GCS 1578 _conservative_max_heap_alignment = MAX4(heap_alignment, 1579 (size_t)os::vm_allocation_granularity(), 1580 os::max_page_size(), 1581 CollectorPolicy::compute_heap_alignment()); 1582 } 1583 1584 void Arguments::select_gc_ergonomically() { 1585 if (os::is_server_class_machine()) { 1586 if (should_auto_select_low_pause_collector()) { 1587 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1588 } else { 1589 FLAG_SET_ERGO(bool, UseParallelGC, true); 1590 } 1591 } 1592 } 1593 1594 void Arguments::select_gc() { 1595 if (!gc_selected()) { 1596 ArgumentsExt::select_gc_ergonomically(); 1597 } 1598 } 1599 1600 void Arguments::set_ergonomics_flags() { 1601 select_gc(); 1602 1603 #ifdef COMPILER2 1604 // Shared spaces work fine with other GCs but causes bytecode rewriting 1605 // to be disabled, which hurts interpreter performance and decreases 1606 // server performance. When -server is specified, keep the default off 1607 // unless it is asked for. Future work: either add bytecode rewriting 1608 // at link time, or rewrite bytecodes in non-shared methods. 1609 if (!DumpSharedSpaces && !RequireSharedSpaces && 1610 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1611 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1612 } 1613 #endif 1614 1615 set_conservative_max_heap_alignment(); 1616 1617 #ifndef ZERO 1618 #ifdef _LP64 1619 set_use_compressed_oops(); 1620 1621 // set_use_compressed_klass_ptrs() must be called after calling 1622 // set_use_compressed_oops(). 1623 set_use_compressed_klass_ptrs(); 1624 1625 // Also checks that certain machines are slower with compressed oops 1626 // in vm_version initialization code. 1627 #endif // _LP64 1628 #endif // !ZERO 1629 } 1630 1631 void Arguments::set_parallel_gc_flags() { 1632 assert(UseParallelGC || UseParallelOldGC, "Error"); 1633 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1634 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1635 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1636 } 1637 FLAG_SET_DEFAULT(UseParallelGC, true); 1638 1639 // If no heap maximum was requested explicitly, use some reasonable fraction 1640 // of the physical memory, up to a maximum of 1GB. 1641 FLAG_SET_DEFAULT(ParallelGCThreads, 1642 Abstract_VM_Version::parallel_worker_threads()); 1643 if (ParallelGCThreads == 0) { 1644 jio_fprintf(defaultStream::error_stream(), 1645 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1646 vm_exit(1); 1647 } 1648 1649 if (UseAdaptiveSizePolicy) { 1650 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1651 // unless the user actually sets these flags. 1652 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1653 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1654 _min_heap_free_ratio = MinHeapFreeRatio; 1655 } 1656 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1657 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1658 _max_heap_free_ratio = MaxHeapFreeRatio; 1659 } 1660 } 1661 1662 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1663 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1664 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1665 // See CR 6362902 for details. 1666 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1667 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1668 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1669 } 1670 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1671 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1672 } 1673 } 1674 1675 if (UseParallelOldGC) { 1676 // Par compact uses lower default values since they are treated as 1677 // minimums. These are different defaults because of the different 1678 // interpretation and are not ergonomically set. 1679 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1680 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1681 } 1682 } 1683 } 1684 1685 void Arguments::set_g1_gc_flags() { 1686 assert(UseG1GC, "Error"); 1687 #ifdef COMPILER1 1688 FastTLABRefill = false; 1689 #endif 1690 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1691 if (ParallelGCThreads == 0) { 1692 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1693 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1694 } 1695 1696 #if INCLUDE_ALL_GCS 1697 if (G1ConcRefinementThreads == 0) { 1698 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1699 } 1700 #endif 1701 1702 // MarkStackSize will be set (if it hasn't been set by the user) 1703 // when concurrent marking is initialized. 1704 // Its value will be based upon the number of parallel marking threads. 1705 // But we do set the maximum mark stack size here. 1706 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1707 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1708 } 1709 1710 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1711 // In G1, we want the default GC overhead goal to be higher than 1712 // say in PS. So we set it here to 10%. Otherwise the heap might 1713 // be expanded more aggressively than we would like it to. In 1714 // fact, even 10% seems to not be high enough in some cases 1715 // (especially small GC stress tests that the main thing they do 1716 // is allocation). We might consider increase it further. 1717 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1718 } 1719 1720 if (PrintGCDetails && Verbose) { 1721 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1722 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1723 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1724 } 1725 } 1726 1727 #if !INCLUDE_ALL_GCS 1728 #ifdef ASSERT 1729 static bool verify_serial_gc_flags() { 1730 return (UseSerialGC && 1731 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1732 UseParallelGC || UseParallelOldGC)); 1733 } 1734 #endif // ASSERT 1735 #endif // INCLUDE_ALL_GCS 1736 1737 void Arguments::set_gc_specific_flags() { 1738 #if INCLUDE_ALL_GCS 1739 // Set per-collector flags 1740 if (UseParallelGC || UseParallelOldGC) { 1741 set_parallel_gc_flags(); 1742 } else if (UseConcMarkSweepGC) { 1743 set_cms_and_parnew_gc_flags(); 1744 } else if (UseG1GC) { 1745 set_g1_gc_flags(); 1746 } 1747 check_deprecated_gc_flags(); 1748 if (AssumeMP && !UseSerialGC) { 1749 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1750 warning("If the number of processors is expected to increase from one, then" 1751 " you should configure the number of parallel GC threads appropriately" 1752 " using -XX:ParallelGCThreads=N"); 1753 } 1754 } 1755 if (MinHeapFreeRatio == 100) { 1756 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1757 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1758 } 1759 #else // INCLUDE_ALL_GCS 1760 assert(verify_serial_gc_flags(), "SerialGC unset"); 1761 #endif // INCLUDE_ALL_GCS 1762 } 1763 1764 julong Arguments::limit_by_allocatable_memory(julong limit) { 1765 julong max_allocatable; 1766 julong result = limit; 1767 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1768 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1769 } 1770 return result; 1771 } 1772 1773 // Use static initialization to get the default before parsing 1774 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1775 1776 void Arguments::set_heap_size() { 1777 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1778 // Deprecated flag 1779 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1780 } 1781 1782 const julong phys_mem = 1783 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1784 : (julong)MaxRAM; 1785 1786 // If the maximum heap size has not been set with -Xmx, 1787 // then set it as fraction of the size of physical memory, 1788 // respecting the maximum and minimum sizes of the heap. 1789 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1790 julong reasonable_max = phys_mem / MaxRAMFraction; 1791 1792 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1793 // Small physical memory, so use a minimum fraction of it for the heap 1794 reasonable_max = phys_mem / MinRAMFraction; 1795 } else { 1796 // Not-small physical memory, so require a heap at least 1797 // as large as MaxHeapSize 1798 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1799 } 1800 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1801 // Limit the heap size to ErgoHeapSizeLimit 1802 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1803 } 1804 if (UseCompressedOops) { 1805 // Limit the heap size to the maximum possible when using compressed oops 1806 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1807 1808 // HeapBaseMinAddress can be greater than default but not less than. 1809 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1810 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1811 // matches compressed oops printing flags 1812 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1813 jio_fprintf(defaultStream::error_stream(), 1814 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1815 " (" UINTX_FORMAT "G) which is greater than value given " 1816 UINTX_FORMAT "\n", 1817 DefaultHeapBaseMinAddress, 1818 DefaultHeapBaseMinAddress/G, 1819 HeapBaseMinAddress); 1820 } 1821 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1822 } 1823 } 1824 1825 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1826 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1827 // but it should be not less than default MaxHeapSize. 1828 max_coop_heap -= HeapBaseMinAddress; 1829 } 1830 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1831 } 1832 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1833 1834 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1835 // An initial heap size was specified on the command line, 1836 // so be sure that the maximum size is consistent. Done 1837 // after call to limit_by_allocatable_memory because that 1838 // method might reduce the allocation size. 1839 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1840 } 1841 1842 if (PrintGCDetails && Verbose) { 1843 // Cannot use gclog_or_tty yet. 1844 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1845 } 1846 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1847 } 1848 1849 // If the minimum or initial heap_size have not been set or requested to be set 1850 // ergonomically, set them accordingly. 1851 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1852 julong reasonable_minimum = (julong)(OldSize + NewSize); 1853 1854 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1855 1856 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1857 1858 if (InitialHeapSize == 0) { 1859 julong reasonable_initial = phys_mem / InitialRAMFraction; 1860 1861 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1862 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1863 1864 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1865 1866 if (PrintGCDetails && Verbose) { 1867 // Cannot use gclog_or_tty yet. 1868 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1869 } 1870 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1871 } 1872 // If the minimum heap size has not been set (via -Xms), 1873 // synchronize with InitialHeapSize to avoid errors with the default value. 1874 if (min_heap_size() == 0) { 1875 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1876 if (PrintGCDetails && Verbose) { 1877 // Cannot use gclog_or_tty yet. 1878 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1879 } 1880 } 1881 } 1882 } 1883 1884 // This must be called after ergonomics because we want bytecode rewriting 1885 // if the server compiler is used, or if UseSharedSpaces is disabled. 1886 void Arguments::set_bytecode_flags() { 1887 // Better not attempt to store into a read-only space. 1888 if (UseSharedSpaces) { 1889 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1890 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1891 } 1892 1893 if (!RewriteBytecodes) { 1894 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1895 } 1896 } 1897 1898 // Aggressive optimization flags -XX:+AggressiveOpts 1899 void Arguments::set_aggressive_opts_flags() { 1900 #ifdef COMPILER2 1901 if (AggressiveUnboxing) { 1902 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1903 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1904 } else if (!EliminateAutoBox) { 1905 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1906 AggressiveUnboxing = false; 1907 } 1908 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1909 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1910 } else if (!DoEscapeAnalysis) { 1911 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1912 AggressiveUnboxing = false; 1913 } 1914 } 1915 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1916 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1917 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1918 } 1919 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1920 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1921 } 1922 1923 // Feed the cache size setting into the JDK 1924 char buffer[1024]; 1925 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1926 add_property(buffer); 1927 } 1928 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1929 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1930 } 1931 #endif 1932 1933 if (AggressiveOpts) { 1934 // Sample flag setting code 1935 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1936 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1937 // } 1938 } 1939 } 1940 1941 //=========================================================================================================== 1942 // Parsing of java.compiler property 1943 1944 void Arguments::process_java_compiler_argument(char* arg) { 1945 // For backwards compatibility, Djava.compiler=NONE or "" 1946 // causes us to switch to -Xint mode UNLESS -Xdebug 1947 // is also specified. 1948 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1949 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1950 } 1951 } 1952 1953 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1954 _sun_java_launcher = os::strdup_check_oom(launcher); 1955 } 1956 1957 bool Arguments::created_by_java_launcher() { 1958 assert(_sun_java_launcher != NULL, "property must have value"); 1959 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1960 } 1961 1962 bool Arguments::sun_java_launcher_is_altjvm() { 1963 return _sun_java_launcher_is_altjvm; 1964 } 1965 1966 //=========================================================================================================== 1967 // Parsing of main arguments 1968 1969 bool Arguments::verify_interval(uintx val, uintx min, 1970 uintx max, const char* name) { 1971 // Returns true iff value is in the inclusive interval [min..max] 1972 // false, otherwise. 1973 if (val >= min && val <= max) { 1974 return true; 1975 } 1976 jio_fprintf(defaultStream::error_stream(), 1977 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1978 " and " UINTX_FORMAT "\n", 1979 name, val, min, max); 1980 return false; 1981 } 1982 1983 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1984 // Returns true if given value is at least specified min threshold 1985 // false, otherwise. 1986 if (val >= min ) { 1987 return true; 1988 } 1989 jio_fprintf(defaultStream::error_stream(), 1990 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1991 name, val, min); 1992 return false; 1993 } 1994 1995 bool Arguments::verify_percentage(uintx value, const char* name) { 1996 if (is_percentage(value)) { 1997 return true; 1998 } 1999 jio_fprintf(defaultStream::error_stream(), 2000 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2001 name, value); 2002 return false; 2003 } 2004 2005 // check if do gclog rotation 2006 // +UseGCLogFileRotation is a must, 2007 // no gc log rotation when log file not supplied or 2008 // NumberOfGCLogFiles is 0 2009 void check_gclog_consistency() { 2010 if (UseGCLogFileRotation) { 2011 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2012 jio_fprintf(defaultStream::output_stream(), 2013 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2014 "where num_of_file > 0\n" 2015 "GC log rotation is turned off\n"); 2016 UseGCLogFileRotation = false; 2017 } 2018 } 2019 2020 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2021 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2022 jio_fprintf(defaultStream::output_stream(), 2023 "GCLogFileSize changed to minimum 8K\n"); 2024 } 2025 } 2026 2027 // This function is called for -Xloggc:<filename>, it can be used 2028 // to check if a given file name(or string) conforms to the following 2029 // specification: 2030 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2031 // %p and %t only allowed once. We only limit usage of filename not path 2032 bool is_filename_valid(const char *file_name) { 2033 const char* p = file_name; 2034 char file_sep = os::file_separator()[0]; 2035 const char* cp; 2036 // skip prefix path 2037 for (cp = file_name; *cp != '\0'; cp++) { 2038 if (*cp == '/' || *cp == file_sep) { 2039 p = cp + 1; 2040 } 2041 } 2042 2043 int count_p = 0; 2044 int count_t = 0; 2045 while (*p != '\0') { 2046 if ((*p >= '0' && *p <= '9') || 2047 (*p >= 'A' && *p <= 'Z') || 2048 (*p >= 'a' && *p <= 'z') || 2049 *p == '-' || 2050 *p == '_' || 2051 *p == '.') { 2052 p++; 2053 continue; 2054 } 2055 if (*p == '%') { 2056 if(*(p + 1) == 'p') { 2057 p += 2; 2058 count_p ++; 2059 continue; 2060 } 2061 if (*(p + 1) == 't') { 2062 p += 2; 2063 count_t ++; 2064 continue; 2065 } 2066 } 2067 return false; 2068 } 2069 return count_p < 2 && count_t < 2; 2070 } 2071 2072 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2073 if (!is_percentage(min_heap_free_ratio)) { 2074 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2075 return false; 2076 } 2077 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2078 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2079 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2080 MaxHeapFreeRatio); 2081 return false; 2082 } 2083 // This does not set the flag itself, but stores the value in a safe place for later usage. 2084 _min_heap_free_ratio = min_heap_free_ratio; 2085 return true; 2086 } 2087 2088 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2089 if (!is_percentage(max_heap_free_ratio)) { 2090 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2091 return false; 2092 } 2093 if (max_heap_free_ratio < MinHeapFreeRatio) { 2094 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2095 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2096 MinHeapFreeRatio); 2097 return false; 2098 } 2099 // This does not set the flag itself, but stores the value in a safe place for later usage. 2100 _max_heap_free_ratio = max_heap_free_ratio; 2101 return true; 2102 } 2103 2104 // Check consistency of GC selection 2105 bool Arguments::check_gc_consistency_user() { 2106 check_gclog_consistency(); 2107 // Ensure that the user has not selected conflicting sets 2108 // of collectors. 2109 uint i = 0; 2110 if (UseSerialGC) i++; 2111 if (UseConcMarkSweepGC) i++; 2112 if (UseParallelGC || UseParallelOldGC) i++; 2113 if (UseG1GC) i++; 2114 if (i > 1) { 2115 jio_fprintf(defaultStream::error_stream(), 2116 "Conflicting collector combinations in option list; " 2117 "please refer to the release notes for the combinations " 2118 "allowed\n"); 2119 return false; 2120 } 2121 2122 if (UseConcMarkSweepGC && !UseParNewGC) { 2123 jio_fprintf(defaultStream::error_stream(), 2124 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2125 return false; 2126 } 2127 2128 if (UseParNewGC && !UseConcMarkSweepGC) { 2129 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2130 // set up UseSerialGC properly, so that can't be used in the check here. 2131 jio_fprintf(defaultStream::error_stream(), 2132 "It is not possible to combine the ParNew young collector with the Serial old collector.\n"); 2133 return false; 2134 } 2135 2136 return true; 2137 } 2138 2139 void Arguments::check_deprecated_gc_flags() { 2140 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2141 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2142 } 2143 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2144 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2145 "and will likely be removed in future release"); 2146 } 2147 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2148 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2149 "Use MaxRAMFraction instead."); 2150 } 2151 } 2152 2153 // Check stack pages settings 2154 bool Arguments::check_stack_pages() 2155 { 2156 bool status = true; 2157 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2158 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2159 // greater stack shadow pages can't generate instruction to bang stack 2160 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2161 return status; 2162 } 2163 2164 // Check the consistency of vm_init_args 2165 bool Arguments::check_vm_args_consistency() { 2166 // Method for adding checks for flag consistency. 2167 // The intent is to warn the user of all possible conflicts, 2168 // before returning an error. 2169 // Note: Needs platform-dependent factoring. 2170 bool status = true; 2171 2172 if (TLABRefillWasteFraction == 0) { 2173 jio_fprintf(defaultStream::error_stream(), 2174 "TLABRefillWasteFraction should be a denominator, " 2175 "not " SIZE_FORMAT "\n", 2176 TLABRefillWasteFraction); 2177 status = false; 2178 } 2179 2180 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2181 "AdaptiveSizePolicyWeight"); 2182 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2183 2184 // Divide by bucket size to prevent a large size from causing rollover when 2185 // calculating amount of memory needed to be allocated for the String table. 2186 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2187 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2188 2189 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2190 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2191 2192 { 2193 // Using "else if" below to avoid printing two error messages if min > max. 2194 // This will also prevent us from reporting both min>100 and max>100 at the 2195 // same time, but that is less annoying than printing two identical errors IMHO. 2196 FormatBuffer<80> err_msg("%s",""); 2197 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2198 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2199 status = false; 2200 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2201 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2202 status = false; 2203 } 2204 } 2205 2206 // Min/MaxMetaspaceFreeRatio 2207 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2208 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2209 2210 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2211 jio_fprintf(defaultStream::error_stream(), 2212 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2213 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2214 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2215 MinMetaspaceFreeRatio, 2216 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2217 MaxMetaspaceFreeRatio); 2218 status = false; 2219 } 2220 2221 // Trying to keep 100% free is not practical 2222 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2223 2224 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2225 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2226 } 2227 2228 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2229 // Settings to encourage splitting. 2230 if (!FLAG_IS_CMDLINE(NewRatio)) { 2231 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2232 } 2233 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2234 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2235 } 2236 } 2237 2238 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2239 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2240 } 2241 2242 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2243 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2244 if (GCTimeLimit == 100) { 2245 // Turn off gc-overhead-limit-exceeded checks 2246 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2247 } 2248 2249 status = status && check_gc_consistency_user(); 2250 status = status && check_stack_pages(); 2251 2252 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2253 "CMSIncrementalSafetyFactor"); 2254 2255 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2256 // insists that we hold the requisite locks so that the iteration is 2257 // MT-safe. For the verification at start-up and shut-down, we don't 2258 // yet have a good way of acquiring and releasing these locks, 2259 // which are not visible at the CollectedHeap level. We want to 2260 // be able to acquire these locks and then do the iteration rather 2261 // than just disable the lock verification. This will be fixed under 2262 // bug 4788986. 2263 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2264 if (VerifyDuringStartup) { 2265 warning("Heap verification at start-up disabled " 2266 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2267 VerifyDuringStartup = false; // Disable verification at start-up 2268 } 2269 2270 if (VerifyBeforeExit) { 2271 warning("Heap verification at shutdown disabled " 2272 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2273 VerifyBeforeExit = false; // Disable verification at shutdown 2274 } 2275 } 2276 2277 // Note: only executed in non-PRODUCT mode 2278 if (!UseAsyncConcMarkSweepGC && 2279 (ExplicitGCInvokesConcurrent || 2280 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2281 jio_fprintf(defaultStream::error_stream(), 2282 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2283 " with -UseAsyncConcMarkSweepGC"); 2284 status = false; 2285 } 2286 2287 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2288 2289 #if INCLUDE_ALL_GCS 2290 if (UseG1GC) { 2291 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2292 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2293 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2294 2295 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2296 "InitiatingHeapOccupancyPercent"); 2297 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2298 "G1RefProcDrainInterval"); 2299 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2300 "G1ConcMarkStepDurationMillis"); 2301 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2302 "G1ConcRSHotCardLimit"); 2303 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2304 "G1ConcRSLogCacheSize"); 2305 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2306 "StringDeduplicationAgeThreshold"); 2307 } 2308 if (UseConcMarkSweepGC) { 2309 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2310 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2311 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2312 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2313 2314 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2315 2316 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2317 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2318 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2319 2320 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2321 2322 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2323 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2324 2325 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2326 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2327 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2328 2329 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2330 2331 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2332 2333 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2334 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2335 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2336 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2337 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2338 } 2339 2340 if (UseParallelGC || UseParallelOldGC) { 2341 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2342 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2343 2344 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2345 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2346 2347 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2348 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2349 2350 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2351 2352 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2353 } 2354 #endif // INCLUDE_ALL_GCS 2355 2356 status = status && verify_interval(RefDiscoveryPolicy, 2357 ReferenceProcessor::DiscoveryPolicyMin, 2358 ReferenceProcessor::DiscoveryPolicyMax, 2359 "RefDiscoveryPolicy"); 2360 2361 // Limit the lower bound of this flag to 1 as it is used in a division 2362 // expression. 2363 status = status && verify_interval(TLABWasteTargetPercent, 2364 1, 100, "TLABWasteTargetPercent"); 2365 2366 status = status && verify_object_alignment(); 2367 2368 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2369 "CompressedClassSpaceSize"); 2370 2371 status = status && verify_interval(MarkStackSizeMax, 2372 1, (max_jint - 1), "MarkStackSizeMax"); 2373 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2374 2375 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2376 2377 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2378 2379 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2380 2381 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2382 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2383 2384 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2385 2386 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2387 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2388 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2389 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2390 2391 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2392 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2393 2394 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2395 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2396 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2397 2398 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2399 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2400 2401 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2402 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2403 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2404 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2405 2406 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2407 #ifdef COMPILER1 2408 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2409 #endif 2410 status = status && verify_min_value(HeapSearchSteps, 1, "HeapSearchSteps"); 2411 2412 if (PrintNMTStatistics) { 2413 #if INCLUDE_NMT 2414 if (MemTracker::tracking_level() == NMT_off) { 2415 #endif // INCLUDE_NMT 2416 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2417 PrintNMTStatistics = false; 2418 #if INCLUDE_NMT 2419 } 2420 #endif 2421 } 2422 2423 // Need to limit the extent of the padding to reasonable size. 2424 // 8K is well beyond the reasonable HW cache line size, even with the 2425 // aggressive prefetching, while still leaving the room for segregating 2426 // among the distinct pages. 2427 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2428 jio_fprintf(defaultStream::error_stream(), 2429 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2430 ContendedPaddingWidth, 0, 8192); 2431 status = false; 2432 } 2433 2434 // Need to enforce the padding not to break the existing field alignments. 2435 // It is sufficient to check against the largest type size. 2436 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2437 jio_fprintf(defaultStream::error_stream(), 2438 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2439 ContendedPaddingWidth, BytesPerLong); 2440 status = false; 2441 } 2442 2443 // Check lower bounds of the code cache 2444 // Template Interpreter code is approximately 3X larger in debug builds. 2445 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2446 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2447 jio_fprintf(defaultStream::error_stream(), 2448 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2449 os::vm_page_size()/K); 2450 status = false; 2451 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2452 jio_fprintf(defaultStream::error_stream(), 2453 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2454 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2455 status = false; 2456 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2457 jio_fprintf(defaultStream::error_stream(), 2458 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2459 min_code_cache_size/K); 2460 status = false; 2461 } else if (ReservedCodeCacheSize > 2*G) { 2462 // Code cache size larger than MAXINT is not supported. 2463 jio_fprintf(defaultStream::error_stream(), 2464 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2465 (2*G)/M); 2466 status = false; 2467 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2468 jio_fprintf(defaultStream::error_stream(), 2469 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2470 min_code_cache_size/K); 2471 status = false; 2472 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2473 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2474 jio_fprintf(defaultStream::error_stream(), 2475 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2476 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2477 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2478 status = false; 2479 } 2480 2481 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2482 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2483 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2484 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2485 2486 2487 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2488 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2489 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2490 // Check the minimum number of compiler threads 2491 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2492 2493 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2494 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2495 } 2496 2497 return status; 2498 } 2499 2500 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2501 const char* option_type) { 2502 if (ignore) return false; 2503 2504 const char* spacer = " "; 2505 if (option_type == NULL) { 2506 option_type = ++spacer; // Set both to the empty string. 2507 } 2508 2509 if (os::obsolete_option(option)) { 2510 jio_fprintf(defaultStream::error_stream(), 2511 "Obsolete %s%soption: %s\n", option_type, spacer, 2512 option->optionString); 2513 return false; 2514 } else { 2515 jio_fprintf(defaultStream::error_stream(), 2516 "Unrecognized %s%soption: %s\n", option_type, spacer, 2517 option->optionString); 2518 return true; 2519 } 2520 } 2521 2522 static const char* user_assertion_options[] = { 2523 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2524 }; 2525 2526 static const char* system_assertion_options[] = { 2527 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2528 }; 2529 2530 bool Arguments::parse_uintx(const char* value, 2531 uintx* uintx_arg, 2532 uintx min_size) { 2533 2534 // Check the sign first since atomull() parses only unsigned values. 2535 bool value_is_positive = !(*value == '-'); 2536 2537 if (value_is_positive) { 2538 julong n; 2539 bool good_return = atomull(value, &n); 2540 if (good_return) { 2541 bool above_minimum = n >= min_size; 2542 bool value_is_too_large = n > max_uintx; 2543 2544 if (above_minimum && !value_is_too_large) { 2545 *uintx_arg = n; 2546 return true; 2547 } 2548 } 2549 } 2550 return false; 2551 } 2552 2553 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2554 julong* long_arg, 2555 julong min_size) { 2556 if (!atomull(s, long_arg)) return arg_unreadable; 2557 return check_memory_size(*long_arg, min_size); 2558 } 2559 2560 // Parse JavaVMInitArgs structure 2561 2562 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2563 // For components of the system classpath. 2564 SysClassPath scp(Arguments::get_sysclasspath()); 2565 bool scp_assembly_required = false; 2566 2567 // Save default settings for some mode flags 2568 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2569 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2570 Arguments::_ClipInlining = ClipInlining; 2571 Arguments::_BackgroundCompilation = BackgroundCompilation; 2572 2573 // Setup flags for mixed which is the default 2574 set_mode_flags(_mixed); 2575 2576 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2577 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2578 if (result != JNI_OK) { 2579 return result; 2580 } 2581 2582 // Parse JavaVMInitArgs structure passed in 2583 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2584 if (result != JNI_OK) { 2585 return result; 2586 } 2587 2588 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2589 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2590 if (result != JNI_OK) { 2591 return result; 2592 } 2593 2594 // Do final processing now that all arguments have been parsed 2595 result = finalize_vm_init_args(&scp, scp_assembly_required); 2596 if (result != JNI_OK) { 2597 return result; 2598 } 2599 2600 return JNI_OK; 2601 } 2602 2603 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2604 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2605 // are dealing with -agentpath (case where name is a path), otherwise with 2606 // -agentlib 2607 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2608 char *_name; 2609 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2610 size_t _len_hprof, _len_jdwp, _len_prefix; 2611 2612 if (is_path) { 2613 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2614 return false; 2615 } 2616 2617 _name++; // skip past last path separator 2618 _len_prefix = strlen(JNI_LIB_PREFIX); 2619 2620 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2621 return false; 2622 } 2623 2624 _name += _len_prefix; 2625 _len_hprof = strlen(_hprof); 2626 _len_jdwp = strlen(_jdwp); 2627 2628 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2629 _name += _len_hprof; 2630 } 2631 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2632 _name += _len_jdwp; 2633 } 2634 else { 2635 return false; 2636 } 2637 2638 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2639 return false; 2640 } 2641 2642 return true; 2643 } 2644 2645 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2646 return true; 2647 } 2648 2649 return false; 2650 } 2651 2652 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2653 SysClassPath* scp_p, 2654 bool* scp_assembly_required_p, 2655 Flag::Flags origin) { 2656 // Remaining part of option string 2657 const char* tail; 2658 2659 // iterate over arguments 2660 for (int index = 0; index < args->nOptions; index++) { 2661 bool is_absolute_path = false; // for -agentpath vs -agentlib 2662 2663 const JavaVMOption* option = args->options + index; 2664 2665 if (!match_option(option, "-Djava.class.path", &tail) && 2666 !match_option(option, "-Dsun.java.command", &tail) && 2667 !match_option(option, "-Dsun.java.launcher", &tail)) { 2668 2669 // add all jvm options to the jvm_args string. This string 2670 // is used later to set the java.vm.args PerfData string constant. 2671 // the -Djava.class.path and the -Dsun.java.command options are 2672 // omitted from jvm_args string as each have their own PerfData 2673 // string constant object. 2674 build_jvm_args(option->optionString); 2675 } 2676 2677 // -verbose:[class/gc/jni] 2678 if (match_option(option, "-verbose", &tail)) { 2679 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2680 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2681 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2682 } else if (!strcmp(tail, ":gc")) { 2683 FLAG_SET_CMDLINE(bool, PrintGC, true); 2684 } else if (!strcmp(tail, ":jni")) { 2685 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2686 } 2687 // -da / -ea / -disableassertions / -enableassertions 2688 // These accept an optional class/package name separated by a colon, e.g., 2689 // -da:java.lang.Thread. 2690 } else if (match_option(option, user_assertion_options, &tail, true)) { 2691 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2692 if (*tail == '\0') { 2693 JavaAssertions::setUserClassDefault(enable); 2694 } else { 2695 assert(*tail == ':', "bogus match by match_option()"); 2696 JavaAssertions::addOption(tail + 1, enable); 2697 } 2698 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2699 } else if (match_option(option, system_assertion_options, &tail, false)) { 2700 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2701 JavaAssertions::setSystemClassDefault(enable); 2702 // -bootclasspath: 2703 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2704 scp_p->reset_path(tail); 2705 *scp_assembly_required_p = true; 2706 // -bootclasspath/a: 2707 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2708 scp_p->add_suffix(tail); 2709 *scp_assembly_required_p = true; 2710 // -bootclasspath/p: 2711 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2712 scp_p->add_prefix(tail); 2713 *scp_assembly_required_p = true; 2714 // -Xrun 2715 } else if (match_option(option, "-Xrun", &tail)) { 2716 if (tail != NULL) { 2717 const char* pos = strchr(tail, ':'); 2718 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2719 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2720 name[len] = '\0'; 2721 2722 char *options = NULL; 2723 if(pos != NULL) { 2724 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2725 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2726 } 2727 #if !INCLUDE_JVMTI 2728 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2729 jio_fprintf(defaultStream::error_stream(), 2730 "Profiling and debugging agents are not supported in this VM\n"); 2731 return JNI_ERR; 2732 } 2733 #endif // !INCLUDE_JVMTI 2734 add_init_library(name, options); 2735 } 2736 // -agentlib and -agentpath 2737 } else if (match_option(option, "-agentlib:", &tail) || 2738 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2739 if(tail != NULL) { 2740 const char* pos = strchr(tail, '='); 2741 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2742 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2743 name[len] = '\0'; 2744 2745 char *options = NULL; 2746 if(pos != NULL) { 2747 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2748 } 2749 #if !INCLUDE_JVMTI 2750 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2751 jio_fprintf(defaultStream::error_stream(), 2752 "Profiling and debugging agents are not supported in this VM\n"); 2753 return JNI_ERR; 2754 } 2755 #endif // !INCLUDE_JVMTI 2756 add_init_agent(name, options, is_absolute_path); 2757 } 2758 // -javaagent 2759 } else if (match_option(option, "-javaagent:", &tail)) { 2760 #if !INCLUDE_JVMTI 2761 jio_fprintf(defaultStream::error_stream(), 2762 "Instrumentation agents are not supported in this VM\n"); 2763 return JNI_ERR; 2764 #else 2765 if(tail != NULL) { 2766 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2767 add_init_agent("instrument", options, false); 2768 } 2769 #endif // !INCLUDE_JVMTI 2770 // -Xnoclassgc 2771 } else if (match_option(option, "-Xnoclassgc")) { 2772 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2773 // -Xconcgc 2774 } else if (match_option(option, "-Xconcgc")) { 2775 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2776 // -Xnoconcgc 2777 } else if (match_option(option, "-Xnoconcgc")) { 2778 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2779 // -Xbatch 2780 } else if (match_option(option, "-Xbatch")) { 2781 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2782 // -Xmn for compatibility with other JVM vendors 2783 } else if (match_option(option, "-Xmn", &tail)) { 2784 julong long_initial_young_size = 0; 2785 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2786 if (errcode != arg_in_range) { 2787 jio_fprintf(defaultStream::error_stream(), 2788 "Invalid initial young generation size: %s\n", option->optionString); 2789 describe_range_error(errcode); 2790 return JNI_EINVAL; 2791 } 2792 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2793 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2794 // -Xms 2795 } else if (match_option(option, "-Xms", &tail)) { 2796 julong long_initial_heap_size = 0; 2797 // an initial heap size of 0 means automatically determine 2798 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2799 if (errcode != arg_in_range) { 2800 jio_fprintf(defaultStream::error_stream(), 2801 "Invalid initial heap size: %s\n", option->optionString); 2802 describe_range_error(errcode); 2803 return JNI_EINVAL; 2804 } 2805 set_min_heap_size((uintx)long_initial_heap_size); 2806 // Currently the minimum size and the initial heap sizes are the same. 2807 // Can be overridden with -XX:InitialHeapSize. 2808 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2809 // -Xmx 2810 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2811 julong long_max_heap_size = 0; 2812 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2813 if (errcode != arg_in_range) { 2814 jio_fprintf(defaultStream::error_stream(), 2815 "Invalid maximum heap size: %s\n", option->optionString); 2816 describe_range_error(errcode); 2817 return JNI_EINVAL; 2818 } 2819 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2820 // Xmaxf 2821 } else if (match_option(option, "-Xmaxf", &tail)) { 2822 char* err; 2823 int maxf = (int)(strtod(tail, &err) * 100); 2824 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2825 jio_fprintf(defaultStream::error_stream(), 2826 "Bad max heap free percentage size: %s\n", 2827 option->optionString); 2828 return JNI_EINVAL; 2829 } else { 2830 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2831 } 2832 // Xminf 2833 } else if (match_option(option, "-Xminf", &tail)) { 2834 char* err; 2835 int minf = (int)(strtod(tail, &err) * 100); 2836 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2837 jio_fprintf(defaultStream::error_stream(), 2838 "Bad min heap free percentage size: %s\n", 2839 option->optionString); 2840 return JNI_EINVAL; 2841 } else { 2842 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2843 } 2844 // -Xss 2845 } else if (match_option(option, "-Xss", &tail)) { 2846 julong long_ThreadStackSize = 0; 2847 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2848 if (errcode != arg_in_range) { 2849 jio_fprintf(defaultStream::error_stream(), 2850 "Invalid thread stack size: %s\n", option->optionString); 2851 describe_range_error(errcode); 2852 return JNI_EINVAL; 2853 } 2854 // Internally track ThreadStackSize in units of 1024 bytes. 2855 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2856 round_to((int)long_ThreadStackSize, K) / K); 2857 // -Xoss 2858 } else if (match_option(option, "-Xoss", &tail)) { 2859 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2860 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2861 julong long_CodeCacheExpansionSize = 0; 2862 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2863 if (errcode != arg_in_range) { 2864 jio_fprintf(defaultStream::error_stream(), 2865 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2866 os::vm_page_size()/K); 2867 return JNI_EINVAL; 2868 } 2869 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2870 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2871 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2872 julong long_ReservedCodeCacheSize = 0; 2873 2874 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2875 if (errcode != arg_in_range) { 2876 jio_fprintf(defaultStream::error_stream(), 2877 "Invalid maximum code cache size: %s.\n", option->optionString); 2878 return JNI_EINVAL; 2879 } 2880 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2881 // -XX:NonNMethodCodeHeapSize= 2882 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2883 julong long_NonNMethodCodeHeapSize = 0; 2884 2885 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2886 if (errcode != arg_in_range) { 2887 jio_fprintf(defaultStream::error_stream(), 2888 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2889 return JNI_EINVAL; 2890 } 2891 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2892 // -XX:ProfiledCodeHeapSize= 2893 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2894 julong long_ProfiledCodeHeapSize = 0; 2895 2896 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2897 if (errcode != arg_in_range) { 2898 jio_fprintf(defaultStream::error_stream(), 2899 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2900 return JNI_EINVAL; 2901 } 2902 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2903 // -XX:NonProfiledCodeHeapSizee= 2904 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2905 julong long_NonProfiledCodeHeapSize = 0; 2906 2907 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2908 if (errcode != arg_in_range) { 2909 jio_fprintf(defaultStream::error_stream(), 2910 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2911 return JNI_EINVAL; 2912 } 2913 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2914 //-XX:IncreaseFirstTierCompileThresholdAt= 2915 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2916 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2917 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2918 jio_fprintf(defaultStream::error_stream(), 2919 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2920 option->optionString); 2921 return JNI_EINVAL; 2922 } 2923 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2924 // -green 2925 } else if (match_option(option, "-green")) { 2926 jio_fprintf(defaultStream::error_stream(), 2927 "Green threads support not available\n"); 2928 return JNI_EINVAL; 2929 // -native 2930 } else if (match_option(option, "-native")) { 2931 // HotSpot always uses native threads, ignore silently for compatibility 2932 // -Xsqnopause 2933 } else if (match_option(option, "-Xsqnopause")) { 2934 // EVM option, ignore silently for compatibility 2935 // -Xrs 2936 } else if (match_option(option, "-Xrs")) { 2937 // Classic/EVM option, new functionality 2938 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2939 } else if (match_option(option, "-Xusealtsigs")) { 2940 // change default internal VM signals used - lower case for back compat 2941 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2942 // -Xoptimize 2943 } else if (match_option(option, "-Xoptimize")) { 2944 // EVM option, ignore silently for compatibility 2945 // -Xprof 2946 } else if (match_option(option, "-Xprof")) { 2947 #if INCLUDE_FPROF 2948 _has_profile = true; 2949 #else // INCLUDE_FPROF 2950 jio_fprintf(defaultStream::error_stream(), 2951 "Flat profiling is not supported in this VM.\n"); 2952 return JNI_ERR; 2953 #endif // INCLUDE_FPROF 2954 // -Xconcurrentio 2955 } else if (match_option(option, "-Xconcurrentio")) { 2956 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2957 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2958 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2959 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2960 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2961 2962 // -Xinternalversion 2963 } else if (match_option(option, "-Xinternalversion")) { 2964 jio_fprintf(defaultStream::output_stream(), "%s\n", 2965 VM_Version::internal_vm_info_string()); 2966 vm_exit(0); 2967 #ifndef PRODUCT 2968 // -Xprintflags 2969 } else if (match_option(option, "-Xprintflags")) { 2970 CommandLineFlags::printFlags(tty, false); 2971 vm_exit(0); 2972 #endif 2973 // -D 2974 } else if (match_option(option, "-D", &tail)) { 2975 const char* value; 2976 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2977 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2978 // abort if -Djava.endorsed.dirs is set 2979 jio_fprintf(defaultStream::output_stream(), 2980 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2981 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2982 return JNI_EINVAL; 2983 } 2984 if (match_option(option, "-Djava.ext.dirs=", &value) && 2985 *value != '\0' && strcmp(value, "\"\"") != 0) { 2986 // abort if -Djava.ext.dirs is set 2987 jio_fprintf(defaultStream::output_stream(), 2988 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2989 return JNI_EINVAL; 2990 } 2991 2992 if (!add_property(tail)) { 2993 return JNI_ENOMEM; 2994 } 2995 // Out of the box management support 2996 if (match_option(option, "-Dcom.sun.management", &tail)) { 2997 #if INCLUDE_MANAGEMENT 2998 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2999 #else 3000 jio_fprintf(defaultStream::output_stream(), 3001 "-Dcom.sun.management is not supported in this VM.\n"); 3002 return JNI_ERR; 3003 #endif 3004 } 3005 // -Xint 3006 } else if (match_option(option, "-Xint")) { 3007 set_mode_flags(_int); 3008 // -Xmixed 3009 } else if (match_option(option, "-Xmixed")) { 3010 set_mode_flags(_mixed); 3011 // -Xcomp 3012 } else if (match_option(option, "-Xcomp")) { 3013 // for testing the compiler; turn off all flags that inhibit compilation 3014 set_mode_flags(_comp); 3015 // -Xshare:dump 3016 } else if (match_option(option, "-Xshare:dump")) { 3017 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3018 set_mode_flags(_int); // Prevent compilation, which creates objects 3019 // -Xshare:on 3020 } else if (match_option(option, "-Xshare:on")) { 3021 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3022 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3023 // -Xshare:auto 3024 } else if (match_option(option, "-Xshare:auto")) { 3025 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3026 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3027 // -Xshare:off 3028 } else if (match_option(option, "-Xshare:off")) { 3029 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3030 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3031 // -Xverify 3032 } else if (match_option(option, "-Xverify", &tail)) { 3033 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3034 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3035 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3036 } else if (strcmp(tail, ":remote") == 0) { 3037 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3038 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3039 } else if (strcmp(tail, ":none") == 0) { 3040 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3041 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3042 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3043 return JNI_EINVAL; 3044 } 3045 // -Xdebug 3046 } else if (match_option(option, "-Xdebug")) { 3047 // note this flag has been used, then ignore 3048 set_xdebug_mode(true); 3049 // -Xnoagent 3050 } else if (match_option(option, "-Xnoagent")) { 3051 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3052 } else if (match_option(option, "-Xboundthreads")) { 3053 // Bind user level threads to kernel threads (Solaris only) 3054 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3055 } else if (match_option(option, "-Xloggc:", &tail)) { 3056 // Redirect GC output to the file. -Xloggc:<filename> 3057 // ostream_init_log(), when called will use this filename 3058 // to initialize a fileStream. 3059 _gc_log_filename = os::strdup_check_oom(tail); 3060 if (!is_filename_valid(_gc_log_filename)) { 3061 jio_fprintf(defaultStream::output_stream(), 3062 "Invalid file name for use with -Xloggc: Filename can only contain the " 3063 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3064 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3065 return JNI_EINVAL; 3066 } 3067 FLAG_SET_CMDLINE(bool, PrintGC, true); 3068 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3069 3070 // JNI hooks 3071 } else if (match_option(option, "-Xcheck", &tail)) { 3072 if (!strcmp(tail, ":jni")) { 3073 #if !INCLUDE_JNI_CHECK 3074 warning("JNI CHECKING is not supported in this VM"); 3075 #else 3076 CheckJNICalls = true; 3077 #endif // INCLUDE_JNI_CHECK 3078 } else if (is_bad_option(option, args->ignoreUnrecognized, 3079 "check")) { 3080 return JNI_EINVAL; 3081 } 3082 } else if (match_option(option, "vfprintf")) { 3083 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3084 } else if (match_option(option, "exit")) { 3085 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3086 } else if (match_option(option, "abort")) { 3087 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3088 // -XX:+AggressiveHeap 3089 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3090 3091 // This option inspects the machine and attempts to set various 3092 // parameters to be optimal for long-running, memory allocation 3093 // intensive jobs. It is intended for machines with large 3094 // amounts of cpu and memory. 3095 3096 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3097 // VM, but we may not be able to represent the total physical memory 3098 // available (like having 8gb of memory on a box but using a 32bit VM). 3099 // Thus, we need to make sure we're using a julong for intermediate 3100 // calculations. 3101 julong initHeapSize; 3102 julong total_memory = os::physical_memory(); 3103 3104 if (total_memory < (julong)256*M) { 3105 jio_fprintf(defaultStream::error_stream(), 3106 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3107 vm_exit(1); 3108 } 3109 3110 // The heap size is half of available memory, or (at most) 3111 // all of possible memory less 160mb (leaving room for the OS 3112 // when using ISM). This is the maximum; because adaptive sizing 3113 // is turned on below, the actual space used may be smaller. 3114 3115 initHeapSize = MIN2(total_memory / (julong)2, 3116 total_memory - (julong)160*M); 3117 3118 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3119 3120 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3121 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3122 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3123 // Currently the minimum size and the initial heap sizes are the same. 3124 set_min_heap_size(initHeapSize); 3125 } 3126 if (FLAG_IS_DEFAULT(NewSize)) { 3127 // Make the young generation 3/8ths of the total heap. 3128 FLAG_SET_CMDLINE(uintx, NewSize, 3129 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3130 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3131 } 3132 3133 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3134 FLAG_SET_DEFAULT(UseLargePages, true); 3135 #endif 3136 3137 // Increase some data structure sizes for efficiency 3138 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3139 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3140 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3141 3142 // See the OldPLABSize comment below, but replace 'after promotion' 3143 // with 'after copying'. YoungPLABSize is the size of the survivor 3144 // space per-gc-thread buffers. The default is 4kw. 3145 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3146 3147 // OldPLABSize is the size of the buffers in the old gen that 3148 // UseParallelGC uses to promote live data that doesn't fit in the 3149 // survivor spaces. At any given time, there's one for each gc thread. 3150 // The default size is 1kw. These buffers are rarely used, since the 3151 // survivor spaces are usually big enough. For specjbb, however, there 3152 // are occasions when there's lots of live data in the young gen 3153 // and we end up promoting some of it. We don't have a definite 3154 // explanation for why bumping OldPLABSize helps, but the theory 3155 // is that a bigger PLAB results in retaining something like the 3156 // original allocation order after promotion, which improves mutator 3157 // locality. A minor effect may be that larger PLABs reduce the 3158 // number of PLAB allocation events during gc. The value of 8kw 3159 // was arrived at by experimenting with specjbb. 3160 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3161 3162 // Enable parallel GC and adaptive generation sizing 3163 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3164 FLAG_SET_DEFAULT(ParallelGCThreads, 3165 Abstract_VM_Version::parallel_worker_threads()); 3166 3167 // Encourage steady state memory management 3168 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3169 3170 // This appears to improve mutator locality 3171 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3172 3173 // Get around early Solaris scheduling bug 3174 // (affinity vs other jobs on system) 3175 // but disallow DR and offlining (5008695). 3176 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3177 3178 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3179 // and the last option wins. 3180 } else if (match_option(option, "-XX:+NeverTenure")) { 3181 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3182 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3183 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3184 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3185 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3186 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3187 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3188 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3189 uintx max_tenuring_thresh = 0; 3190 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3191 jio_fprintf(defaultStream::error_stream(), 3192 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3193 } 3194 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3195 3196 if (MaxTenuringThreshold == 0) { 3197 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3198 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3199 } else { 3200 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3201 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3202 } 3203 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3204 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3205 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3206 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3207 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3208 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3209 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3210 #if defined(DTRACE_ENABLED) 3211 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3212 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3213 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3214 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3215 #else // defined(DTRACE_ENABLED) 3216 jio_fprintf(defaultStream::error_stream(), 3217 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3218 return JNI_EINVAL; 3219 #endif // defined(DTRACE_ENABLED) 3220 #ifdef ASSERT 3221 } else if (match_option(option, "-XX:+FullGCALot")) { 3222 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3223 // disable scavenge before parallel mark-compact 3224 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3225 #endif 3226 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3227 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3228 julong stack_size = 0; 3229 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3230 if (errcode != arg_in_range) { 3231 jio_fprintf(defaultStream::error_stream(), 3232 "Invalid mark stack size: %s\n", option->optionString); 3233 describe_range_error(errcode); 3234 return JNI_EINVAL; 3235 } 3236 jio_fprintf(defaultStream::error_stream(), 3237 "Please use -XX:MarkStackSize in place of " 3238 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3239 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3240 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3241 julong max_stack_size = 0; 3242 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3243 if (errcode != arg_in_range) { 3244 jio_fprintf(defaultStream::error_stream(), 3245 "Invalid maximum mark stack size: %s\n", 3246 option->optionString); 3247 describe_range_error(errcode); 3248 return JNI_EINVAL; 3249 } 3250 jio_fprintf(defaultStream::error_stream(), 3251 "Please use -XX:MarkStackSizeMax in place of " 3252 "-XX:CMSMarkStackSizeMax in the future\n"); 3253 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3254 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3255 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3256 uintx conc_threads = 0; 3257 if (!parse_uintx(tail, &conc_threads, 1)) { 3258 jio_fprintf(defaultStream::error_stream(), 3259 "Invalid concurrent threads: %s\n", option->optionString); 3260 return JNI_EINVAL; 3261 } 3262 jio_fprintf(defaultStream::error_stream(), 3263 "Please use -XX:ConcGCThreads in place of " 3264 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3265 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3266 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3267 julong max_direct_memory_size = 0; 3268 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3269 if (errcode != arg_in_range) { 3270 jio_fprintf(defaultStream::error_stream(), 3271 "Invalid maximum direct memory size: %s\n", 3272 option->optionString); 3273 describe_range_error(errcode); 3274 return JNI_EINVAL; 3275 } 3276 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3277 #if !INCLUDE_MANAGEMENT 3278 } else if (match_option(option, "-XX:+ManagementServer")) { 3279 jio_fprintf(defaultStream::error_stream(), 3280 "ManagementServer is not supported in this VM.\n"); 3281 return JNI_ERR; 3282 #endif // INCLUDE_MANAGEMENT 3283 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3284 // Skip -XX:Flags= since that case has already been handled 3285 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3286 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3287 return JNI_EINVAL; 3288 } 3289 } 3290 // Unknown option 3291 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3292 return JNI_ERR; 3293 } 3294 } 3295 3296 // PrintSharedArchiveAndExit will turn on 3297 // -Xshare:on 3298 // -XX:+TraceClassPaths 3299 if (PrintSharedArchiveAndExit) { 3300 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3301 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3302 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3303 } 3304 3305 // Change the default value for flags which have different default values 3306 // when working with older JDKs. 3307 #ifdef LINUX 3308 if (JDK_Version::current().compare_major(6) <= 0 && 3309 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3310 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3311 } 3312 #endif // LINUX 3313 fix_appclasspath(); 3314 return JNI_OK; 3315 } 3316 3317 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3318 // 3319 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3320 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3321 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3322 // path is treated as the current directory. 3323 // 3324 // This causes problems with CDS, which requires that all directories specified in the classpath 3325 // must be empty. In most cases, applications do NOT want to load classes from the current 3326 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3327 // scripts compatible with CDS. 3328 void Arguments::fix_appclasspath() { 3329 if (IgnoreEmptyClassPaths) { 3330 const char separator = *os::path_separator(); 3331 const char* src = _java_class_path->value(); 3332 3333 // skip over all the leading empty paths 3334 while (*src == separator) { 3335 src ++; 3336 } 3337 3338 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3339 strncpy(copy, src, strlen(src) + 1); 3340 3341 // trim all trailing empty paths 3342 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3343 *tail = '\0'; 3344 } 3345 3346 char from[3] = {separator, separator, '\0'}; 3347 char to [2] = {separator, '\0'}; 3348 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3349 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3350 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3351 } 3352 3353 _java_class_path->set_value(copy); 3354 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3355 } 3356 3357 if (!PrintSharedArchiveAndExit) { 3358 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3359 } 3360 } 3361 3362 static bool has_jar_files(const char* directory) { 3363 DIR* dir = os::opendir(directory); 3364 if (dir == NULL) return false; 3365 3366 struct dirent *entry; 3367 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3368 bool hasJarFile = false; 3369 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3370 const char* name = entry->d_name; 3371 const char* ext = name + strlen(name) - 4; 3372 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3373 } 3374 FREE_C_HEAP_ARRAY(char, dbuf); 3375 os::closedir(dir); 3376 return hasJarFile ; 3377 } 3378 3379 static int check_non_empty_dirs(const char* path) { 3380 const char separator = *os::path_separator(); 3381 const char* const end = path + strlen(path); 3382 int nonEmptyDirs = 0; 3383 while (path < end) { 3384 const char* tmp_end = strchr(path, separator); 3385 if (tmp_end == NULL) { 3386 if (has_jar_files(path)) { 3387 nonEmptyDirs++; 3388 jio_fprintf(defaultStream::output_stream(), 3389 "Non-empty directory: %s\n", path); 3390 } 3391 path = end; 3392 } else { 3393 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3394 memcpy(dirpath, path, tmp_end - path); 3395 dirpath[tmp_end - path] = '\0'; 3396 if (has_jar_files(dirpath)) { 3397 nonEmptyDirs++; 3398 jio_fprintf(defaultStream::output_stream(), 3399 "Non-empty directory: %s\n", dirpath); 3400 } 3401 FREE_C_HEAP_ARRAY(char, dirpath); 3402 path = tmp_end + 1; 3403 } 3404 } 3405 return nonEmptyDirs; 3406 } 3407 3408 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3409 // check if the default lib/endorsed directory exists; if so, error 3410 char path[JVM_MAXPATHLEN]; 3411 const char* fileSep = os::file_separator(); 3412 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3413 3414 if (CheckEndorsedAndExtDirs) { 3415 int nonEmptyDirs = 0; 3416 // check endorsed directory 3417 nonEmptyDirs += check_non_empty_dirs(path); 3418 // check the extension directories 3419 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3420 if (nonEmptyDirs > 0) { 3421 return JNI_ERR; 3422 } 3423 } 3424 3425 DIR* dir = os::opendir(path); 3426 if (dir != NULL) { 3427 jio_fprintf(defaultStream::output_stream(), 3428 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3429 "in modular form will be supported via the concept of upgradeable modules.\n"); 3430 os::closedir(dir); 3431 return JNI_ERR; 3432 } 3433 3434 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3435 dir = os::opendir(path); 3436 if (dir != NULL) { 3437 jio_fprintf(defaultStream::output_stream(), 3438 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3439 "Use -classpath instead.\n."); 3440 os::closedir(dir); 3441 return JNI_ERR; 3442 } 3443 3444 if (scp_assembly_required) { 3445 // Assemble the bootclasspath elements into the final path. 3446 Arguments::set_sysclasspath(scp_p->combined_path()); 3447 } 3448 3449 // This must be done after all arguments have been processed. 3450 // java_compiler() true means set to "NONE" or empty. 3451 if (java_compiler() && !xdebug_mode()) { 3452 // For backwards compatibility, we switch to interpreted mode if 3453 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3454 // not specified. 3455 set_mode_flags(_int); 3456 } 3457 3458 if ((TieredCompilation && CompileThresholdScaling == 0) 3459 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) { 3460 set_mode_flags(_int); 3461 } 3462 3463 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3464 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3465 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3466 } 3467 3468 #ifndef COMPILER2 3469 // Don't degrade server performance for footprint 3470 if (FLAG_IS_DEFAULT(UseLargePages) && 3471 MaxHeapSize < LargePageHeapSizeThreshold) { 3472 // No need for large granularity pages w/small heaps. 3473 // Note that large pages are enabled/disabled for both the 3474 // Java heap and the code cache. 3475 FLAG_SET_DEFAULT(UseLargePages, false); 3476 } 3477 3478 #else 3479 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3480 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3481 } 3482 #endif 3483 3484 #ifndef TIERED 3485 // Tiered compilation is undefined. 3486 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3487 #endif 3488 3489 // If we are running in a headless jre, force java.awt.headless property 3490 // to be true unless the property has already been set. 3491 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3492 if (os::is_headless_jre()) { 3493 const char* headless = Arguments::get_property("java.awt.headless"); 3494 if (headless == NULL) { 3495 char envbuffer[128]; 3496 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3497 if (!add_property("java.awt.headless=true")) { 3498 return JNI_ENOMEM; 3499 } 3500 } else { 3501 char buffer[256]; 3502 strcpy(buffer, "java.awt.headless="); 3503 strcat(buffer, envbuffer); 3504 if (!add_property(buffer)) { 3505 return JNI_ENOMEM; 3506 } 3507 } 3508 } 3509 } 3510 3511 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3512 // CMS can only be used with ParNew 3513 FLAG_SET_ERGO(bool, UseParNewGC, true); 3514 } 3515 3516 if (!check_vm_args_consistency()) { 3517 return JNI_ERR; 3518 } 3519 3520 return JNI_OK; 3521 } 3522 3523 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3524 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3525 scp_assembly_required_p); 3526 } 3527 3528 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3529 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3530 scp_assembly_required_p); 3531 } 3532 3533 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3534 const int N_MAX_OPTIONS = 64; 3535 const int OPTION_BUFFER_SIZE = 1024; 3536 char buffer[OPTION_BUFFER_SIZE]; 3537 3538 // The variable will be ignored if it exceeds the length of the buffer. 3539 // Don't check this variable if user has special privileges 3540 // (e.g. unix su command). 3541 if (os::getenv(name, buffer, sizeof(buffer)) && 3542 !os::have_special_privileges()) { 3543 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3544 jio_fprintf(defaultStream::error_stream(), 3545 "Picked up %s: %s\n", name, buffer); 3546 char* rd = buffer; // pointer to the input string (rd) 3547 int i; 3548 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3549 while (isspace(*rd)) rd++; // skip whitespace 3550 if (*rd == 0) break; // we re done when the input string is read completely 3551 3552 // The output, option string, overwrites the input string. 3553 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3554 // input string (rd). 3555 char* wrt = rd; 3556 3557 options[i++].optionString = wrt; // Fill in option 3558 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3559 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3560 int quote = *rd; // matching quote to look for 3561 rd++; // don't copy open quote 3562 while (*rd != quote) { // include everything (even spaces) up until quote 3563 if (*rd == 0) { // string termination means unmatched string 3564 jio_fprintf(defaultStream::error_stream(), 3565 "Unmatched quote in %s\n", name); 3566 return JNI_ERR; 3567 } 3568 *wrt++ = *rd++; // copy to option string 3569 } 3570 rd++; // don't copy close quote 3571 } else { 3572 *wrt++ = *rd++; // copy to option string 3573 } 3574 } 3575 // Need to check if we're done before writing a NULL, 3576 // because the write could be to the byte that rd is pointing to. 3577 if (*rd++ == 0) { 3578 *wrt = 0; 3579 break; 3580 } 3581 *wrt = 0; // Zero terminate option 3582 } 3583 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3584 JavaVMInitArgs vm_args; 3585 vm_args.version = JNI_VERSION_1_2; 3586 vm_args.options = options; 3587 vm_args.nOptions = i; 3588 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3589 3590 if (PrintVMOptions) { 3591 const char* tail; 3592 for (int i = 0; i < vm_args.nOptions; i++) { 3593 const JavaVMOption *option = vm_args.options + i; 3594 if (match_option(option, "-XX:", &tail)) { 3595 logOption(tail); 3596 } 3597 } 3598 } 3599 3600 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3601 } 3602 return JNI_OK; 3603 } 3604 3605 void Arguments::set_shared_spaces_flags() { 3606 if (DumpSharedSpaces) { 3607 if (RequireSharedSpaces) { 3608 warning("cannot dump shared archive while using shared archive"); 3609 } 3610 UseSharedSpaces = false; 3611 #ifdef _LP64 3612 if (!UseCompressedOops || !UseCompressedClassPointers) { 3613 vm_exit_during_initialization( 3614 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3615 } 3616 } else { 3617 if (!UseCompressedOops || !UseCompressedClassPointers) { 3618 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3619 } 3620 #endif 3621 } 3622 } 3623 3624 #if !INCLUDE_ALL_GCS 3625 static void force_serial_gc() { 3626 FLAG_SET_DEFAULT(UseSerialGC, true); 3627 UNSUPPORTED_GC_OPTION(UseG1GC); 3628 UNSUPPORTED_GC_OPTION(UseParallelGC); 3629 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3630 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3631 UNSUPPORTED_GC_OPTION(UseParNewGC); 3632 } 3633 #endif // INCLUDE_ALL_GCS 3634 3635 // Sharing support 3636 // Construct the path to the archive 3637 static char* get_shared_archive_path() { 3638 char *shared_archive_path; 3639 if (SharedArchiveFile == NULL) { 3640 char jvm_path[JVM_MAXPATHLEN]; 3641 os::jvm_path(jvm_path, sizeof(jvm_path)); 3642 char *end = strrchr(jvm_path, *os::file_separator()); 3643 if (end != NULL) *end = '\0'; 3644 size_t jvm_path_len = strlen(jvm_path); 3645 size_t file_sep_len = strlen(os::file_separator()); 3646 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3647 file_sep_len + 20, mtInternal); 3648 if (shared_archive_path != NULL) { 3649 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3650 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3651 strncat(shared_archive_path, "classes.jsa", 11); 3652 } 3653 } else { 3654 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3655 if (shared_archive_path != NULL) { 3656 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3657 } 3658 } 3659 return shared_archive_path; 3660 } 3661 3662 #ifndef PRODUCT 3663 // Determine whether LogVMOutput should be implicitly turned on. 3664 static bool use_vm_log() { 3665 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3666 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3667 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3668 PrintAssembly || TraceDeoptimization || TraceDependencies || 3669 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3670 return true; 3671 } 3672 3673 #ifdef COMPILER1 3674 if (PrintC1Statistics) { 3675 return true; 3676 } 3677 #endif // COMPILER1 3678 3679 #ifdef COMPILER2 3680 if (PrintOptoAssembly || PrintOptoStatistics) { 3681 return true; 3682 } 3683 #endif // COMPILER2 3684 3685 return false; 3686 } 3687 #endif // PRODUCT 3688 3689 // Parse entry point called from JNI_CreateJavaVM 3690 3691 jint Arguments::parse(const JavaVMInitArgs* args) { 3692 3693 // Remaining part of option string 3694 const char* tail; 3695 3696 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3697 const char* hotspotrc = ".hotspotrc"; 3698 bool settings_file_specified = false; 3699 bool needs_hotspotrc_warning = false; 3700 3701 const char* flags_file; 3702 int index; 3703 for (index = 0; index < args->nOptions; index++) { 3704 const JavaVMOption *option = args->options + index; 3705 if (ArgumentsExt::process_options(option)) { 3706 continue; 3707 } 3708 if (match_option(option, "-XX:Flags=", &tail)) { 3709 flags_file = tail; 3710 settings_file_specified = true; 3711 continue; 3712 } 3713 if (match_option(option, "-XX:+PrintVMOptions")) { 3714 PrintVMOptions = true; 3715 continue; 3716 } 3717 if (match_option(option, "-XX:-PrintVMOptions")) { 3718 PrintVMOptions = false; 3719 continue; 3720 } 3721 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3722 IgnoreUnrecognizedVMOptions = true; 3723 continue; 3724 } 3725 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3726 IgnoreUnrecognizedVMOptions = false; 3727 continue; 3728 } 3729 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3730 CommandLineFlags::printFlags(tty, false); 3731 vm_exit(0); 3732 } 3733 #if INCLUDE_NMT 3734 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3735 // The launcher did not setup nmt environment variable properly. 3736 if (!MemTracker::check_launcher_nmt_support(tail)) { 3737 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3738 } 3739 3740 // Verify if nmt option is valid. 3741 if (MemTracker::verify_nmt_option()) { 3742 // Late initialization, still in single-threaded mode. 3743 if (MemTracker::tracking_level() >= NMT_summary) { 3744 MemTracker::init(); 3745 } 3746 } else { 3747 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3748 } 3749 continue; 3750 } 3751 #endif 3752 3753 3754 #ifndef PRODUCT 3755 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3756 CommandLineFlags::printFlags(tty, true); 3757 vm_exit(0); 3758 } 3759 #endif 3760 } 3761 3762 if (IgnoreUnrecognizedVMOptions) { 3763 // uncast const to modify the flag args->ignoreUnrecognized 3764 *(jboolean*)(&args->ignoreUnrecognized) = true; 3765 } 3766 3767 // Parse specified settings file 3768 if (settings_file_specified) { 3769 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3770 return JNI_EINVAL; 3771 } 3772 } else { 3773 #ifdef ASSERT 3774 // Parse default .hotspotrc settings file 3775 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3776 return JNI_EINVAL; 3777 } 3778 #else 3779 struct stat buf; 3780 if (os::stat(hotspotrc, &buf) == 0) { 3781 needs_hotspotrc_warning = true; 3782 } 3783 #endif 3784 } 3785 3786 if (PrintVMOptions) { 3787 for (index = 0; index < args->nOptions; index++) { 3788 const JavaVMOption *option = args->options + index; 3789 if (match_option(option, "-XX:", &tail)) { 3790 logOption(tail); 3791 } 3792 } 3793 } 3794 3795 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3796 jint result = parse_vm_init_args(args); 3797 if (result != JNI_OK) { 3798 return result; 3799 } 3800 3801 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3802 SharedArchivePath = get_shared_archive_path(); 3803 if (SharedArchivePath == NULL) { 3804 return JNI_ENOMEM; 3805 } 3806 3807 // Set up VerifySharedSpaces 3808 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3809 VerifySharedSpaces = true; 3810 } 3811 3812 // Delay warning until here so that we've had a chance to process 3813 // the -XX:-PrintWarnings flag 3814 if (needs_hotspotrc_warning) { 3815 warning("%s file is present but has been ignored. " 3816 "Run with -XX:Flags=%s to load the file.", 3817 hotspotrc, hotspotrc); 3818 } 3819 3820 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3821 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3822 #endif 3823 3824 #if INCLUDE_ALL_GCS 3825 #if (defined JAVASE_EMBEDDED || defined ARM) 3826 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3827 #endif 3828 #endif 3829 3830 #ifndef PRODUCT 3831 if (TraceBytecodesAt != 0) { 3832 TraceBytecodes = true; 3833 } 3834 if (CountCompiledCalls) { 3835 if (UseCounterDecay) { 3836 warning("UseCounterDecay disabled because CountCalls is set"); 3837 UseCounterDecay = false; 3838 } 3839 } 3840 #endif // PRODUCT 3841 3842 if (ScavengeRootsInCode == 0) { 3843 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3844 warning("forcing ScavengeRootsInCode non-zero"); 3845 } 3846 ScavengeRootsInCode = 1; 3847 } 3848 3849 if (PrintGCDetails) { 3850 // Turn on -verbose:gc options as well 3851 PrintGC = true; 3852 } 3853 3854 // Set object alignment values. 3855 set_object_alignment(); 3856 3857 #if !INCLUDE_ALL_GCS 3858 force_serial_gc(); 3859 #endif // INCLUDE_ALL_GCS 3860 #if !INCLUDE_CDS 3861 if (DumpSharedSpaces || RequireSharedSpaces) { 3862 jio_fprintf(defaultStream::error_stream(), 3863 "Shared spaces are not supported in this VM\n"); 3864 return JNI_ERR; 3865 } 3866 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3867 warning("Shared spaces are not supported in this VM"); 3868 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3869 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3870 } 3871 no_shared_spaces("CDS Disabled"); 3872 #endif // INCLUDE_CDS 3873 3874 return JNI_OK; 3875 } 3876 3877 jint Arguments::apply_ergo() { 3878 3879 // Set flags based on ergonomics. 3880 set_ergonomics_flags(); 3881 3882 set_shared_spaces_flags(); 3883 3884 // Check the GC selections again. 3885 if (!ArgumentsExt::check_gc_consistency_ergo()) { 3886 return JNI_EINVAL; 3887 } 3888 3889 if (TieredCompilation) { 3890 set_tiered_flags(); 3891 } else { 3892 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3893 if (CompilationPolicyChoice >= 2) { 3894 vm_exit_during_initialization( 3895 "Incompatible compilation policy selected", NULL); 3896 } 3897 // Scale CompileThreshold 3898 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { 3899 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold)); 3900 } 3901 } 3902 3903 #ifdef COMPILER2 3904 #ifndef PRODUCT 3905 if (PrintIdealGraphLevel > 0) { 3906 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3907 } 3908 #endif 3909 #endif 3910 3911 // Set heap size based on available physical memory 3912 set_heap_size(); 3913 3914 ArgumentsExt::set_gc_specific_flags(); 3915 3916 // Initialize Metaspace flags and alignments 3917 Metaspace::ergo_initialize(); 3918 3919 // Set bytecode rewriting flags 3920 set_bytecode_flags(); 3921 3922 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3923 set_aggressive_opts_flags(); 3924 3925 // Turn off biased locking for locking debug mode flags, 3926 // which are subtly different from each other but neither works with 3927 // biased locking 3928 if (UseHeavyMonitors 3929 #ifdef COMPILER1 3930 || !UseFastLocking 3931 #endif // COMPILER1 3932 ) { 3933 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3934 // flag set to true on command line; warn the user that they 3935 // can't enable biased locking here 3936 warning("Biased Locking is not supported with locking debug flags" 3937 "; ignoring UseBiasedLocking flag." ); 3938 } 3939 UseBiasedLocking = false; 3940 } 3941 3942 #ifdef ZERO 3943 // Clear flags not supported on zero. 3944 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3945 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3946 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3947 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3948 #endif // CC_INTERP 3949 3950 #ifdef COMPILER2 3951 if (!EliminateLocks) { 3952 EliminateNestedLocks = false; 3953 } 3954 if (!Inline) { 3955 IncrementalInline = false; 3956 } 3957 #ifndef PRODUCT 3958 if (!IncrementalInline) { 3959 AlwaysIncrementalInline = false; 3960 } 3961 #endif 3962 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3963 // nothing to use the profiling, turn if off 3964 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3965 } 3966 #endif 3967 3968 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3969 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3970 DebugNonSafepoints = true; 3971 } 3972 3973 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3974 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3975 } 3976 3977 #ifndef PRODUCT 3978 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3979 if (use_vm_log()) { 3980 LogVMOutput = true; 3981 } 3982 } 3983 #endif // PRODUCT 3984 3985 if (PrintCommandLineFlags) { 3986 CommandLineFlags::printSetFlags(tty); 3987 } 3988 3989 // Apply CPU specific policy for the BiasedLocking 3990 if (UseBiasedLocking) { 3991 if (!VM_Version::use_biased_locking() && 3992 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3993 UseBiasedLocking = false; 3994 } 3995 } 3996 #ifdef COMPILER2 3997 if (!UseBiasedLocking || EmitSync != 0) { 3998 UseOptoBiasInlining = false; 3999 } 4000 #endif 4001 4002 return JNI_OK; 4003 } 4004 4005 jint Arguments::adjust_after_os() { 4006 if (UseNUMA) { 4007 if (UseParallelGC || UseParallelOldGC) { 4008 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4009 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4010 } 4011 } 4012 // UseNUMAInterleaving is set to ON for all collectors and 4013 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4014 // such as the parallel collector for Linux and Solaris will 4015 // interleave old gen and survivor spaces on top of NUMA 4016 // allocation policy for the eden space. 4017 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4018 // all platforms and ParallelGC on Windows will interleave all 4019 // of the heap spaces across NUMA nodes. 4020 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4021 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4022 } 4023 } 4024 return JNI_OK; 4025 } 4026 4027 int Arguments::PropertyList_count(SystemProperty* pl) { 4028 int count = 0; 4029 while(pl != NULL) { 4030 count++; 4031 pl = pl->next(); 4032 } 4033 return count; 4034 } 4035 4036 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4037 assert(key != NULL, "just checking"); 4038 SystemProperty* prop; 4039 for (prop = pl; prop != NULL; prop = prop->next()) { 4040 if (strcmp(key, prop->key()) == 0) return prop->value(); 4041 } 4042 return NULL; 4043 } 4044 4045 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4046 int count = 0; 4047 const char* ret_val = NULL; 4048 4049 while(pl != NULL) { 4050 if(count >= index) { 4051 ret_val = pl->key(); 4052 break; 4053 } 4054 count++; 4055 pl = pl->next(); 4056 } 4057 4058 return ret_val; 4059 } 4060 4061 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4062 int count = 0; 4063 char* ret_val = NULL; 4064 4065 while(pl != NULL) { 4066 if(count >= index) { 4067 ret_val = pl->value(); 4068 break; 4069 } 4070 count++; 4071 pl = pl->next(); 4072 } 4073 4074 return ret_val; 4075 } 4076 4077 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4078 SystemProperty* p = *plist; 4079 if (p == NULL) { 4080 *plist = new_p; 4081 } else { 4082 while (p->next() != NULL) { 4083 p = p->next(); 4084 } 4085 p->set_next(new_p); 4086 } 4087 } 4088 4089 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4090 if (plist == NULL) 4091 return; 4092 4093 SystemProperty* new_p = new SystemProperty(k, v, true); 4094 PropertyList_add(plist, new_p); 4095 } 4096 4097 void Arguments::PropertyList_add(SystemProperty *element) { 4098 PropertyList_add(&_system_properties, element); 4099 } 4100 4101 // This add maintains unique property key in the list. 4102 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4103 if (plist == NULL) 4104 return; 4105 4106 // If property key exist then update with new value. 4107 SystemProperty* prop; 4108 for (prop = *plist; prop != NULL; prop = prop->next()) { 4109 if (strcmp(k, prop->key()) == 0) { 4110 if (append) { 4111 prop->append_value(v); 4112 } else { 4113 prop->set_value(v); 4114 } 4115 return; 4116 } 4117 } 4118 4119 PropertyList_add(plist, k, v); 4120 } 4121 4122 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4123 // Returns true if all of the source pointed by src has been copied over to 4124 // the destination buffer pointed by buf. Otherwise, returns false. 4125 // Notes: 4126 // 1. If the length (buflen) of the destination buffer excluding the 4127 // NULL terminator character is not long enough for holding the expanded 4128 // pid characters, it also returns false instead of returning the partially 4129 // expanded one. 4130 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4131 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4132 char* buf, size_t buflen) { 4133 const char* p = src; 4134 char* b = buf; 4135 const char* src_end = &src[srclen]; 4136 char* buf_end = &buf[buflen - 1]; 4137 4138 while (p < src_end && b < buf_end) { 4139 if (*p == '%') { 4140 switch (*(++p)) { 4141 case '%': // "%%" ==> "%" 4142 *b++ = *p++; 4143 break; 4144 case 'p': { // "%p" ==> current process id 4145 // buf_end points to the character before the last character so 4146 // that we could write '\0' to the end of the buffer. 4147 size_t buf_sz = buf_end - b + 1; 4148 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4149 4150 // if jio_snprintf fails or the buffer is not long enough to hold 4151 // the expanded pid, returns false. 4152 if (ret < 0 || ret >= (int)buf_sz) { 4153 return false; 4154 } else { 4155 b += ret; 4156 assert(*b == '\0', "fail in copy_expand_pid"); 4157 if (p == src_end && b == buf_end + 1) { 4158 // reach the end of the buffer. 4159 return true; 4160 } 4161 } 4162 p++; 4163 break; 4164 } 4165 default : 4166 *b++ = '%'; 4167 } 4168 } else { 4169 *b++ = *p++; 4170 } 4171 } 4172 *b = '\0'; 4173 return (p == src_end); // return false if not all of the source was copied 4174 }