1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/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::_java_ext_dirs = NULL; 119 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 120 SystemProperty *Arguments::_sun_boot_library_path = NULL; 121 SystemProperty *Arguments::_java_library_path = NULL; 122 SystemProperty *Arguments::_java_home = NULL; 123 SystemProperty *Arguments::_java_class_path = NULL; 124 SystemProperty *Arguments::_sun_boot_class_path = NULL; 125 126 char* Arguments::_meta_index_path = NULL; 127 char* Arguments::_meta_index_dir = NULL; 128 129 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 130 131 static bool match_option(const JavaVMOption *option, const char* name, 132 const char** tail) { 133 int len = (int)strlen(name); 134 if (strncmp(option->optionString, name, len) == 0) { 135 *tail = option->optionString + len; 136 return true; 137 } else { 138 return false; 139 } 140 } 141 142 static void logOption(const char* opt) { 143 if (PrintVMOptions) { 144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 145 } 146 } 147 148 // Process java launcher properties. 149 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 150 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 151 // sun.java.launcher.pid is defined. 152 // Must do this before setting up other system properties, 153 // as some of them may depend on launcher type. 154 for (int index = 0; index < args->nOptions; index++) { 155 const JavaVMOption* option = args->options + index; 156 const char* tail; 157 158 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 159 process_java_launcher_argument(tail, option->extraInfo); 160 continue; 161 } 162 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 163 if (strcmp(tail, "true") == 0) { 164 _sun_java_launcher_is_altjvm = true; 165 } 166 continue; 167 } 168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 169 _sun_java_launcher_pid = atoi(tail); 170 continue; 171 } 172 } 173 } 174 175 // Initialize system properties key and value. 176 void Arguments::init_system_properties() { 177 178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 179 "Java Virtual Machine Specification", false)); 180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 183 184 // Following are JVMTI agent writable properties. 185 // Properties values are set to NULL and they are 186 // os specific they are initialized in os::init_system_properties_values(). 187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 190 _java_library_path = new SystemProperty("java.library.path", NULL, true); 191 _java_home = new SystemProperty("java.home", NULL, true); 192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 193 194 _java_class_path = new SystemProperty("java.class.path", "", true); 195 196 // Add to System Property list. 197 PropertyList_add(&_system_properties, _java_ext_dirs); 198 PropertyList_add(&_system_properties, _java_endorsed_dirs); 199 PropertyList_add(&_system_properties, _sun_boot_library_path); 200 PropertyList_add(&_system_properties, _java_library_path); 201 PropertyList_add(&_system_properties, _java_home); 202 PropertyList_add(&_system_properties, _java_class_path); 203 PropertyList_add(&_system_properties, _sun_boot_class_path); 204 205 // Set OS specific system properties values 206 os::init_system_properties_values(); 207 } 208 209 210 // Update/Initialize System properties after JDK version number is known 211 void Arguments::init_version_specific_system_properties() { 212 enum { bufsz = 16 }; 213 char buffer[bufsz]; 214 const char* spec_vendor = "Sun Microsystems Inc."; 215 uint32_t spec_version = 0; 216 217 spec_vendor = "Oracle Corporation"; 218 spec_version = JDK_Version::current().major_version(); 219 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 220 221 PropertyList_add(&_system_properties, 222 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 223 PropertyList_add(&_system_properties, 224 new SystemProperty("java.vm.specification.version", buffer, false)); 225 PropertyList_add(&_system_properties, 226 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 227 } 228 229 /** 230 * Provide a slightly more user-friendly way of eliminating -XX flags. 231 * When a flag is eliminated, it can be added to this list in order to 232 * continue accepting this flag on the command-line, while issuing a warning 233 * and ignoring the value. Once the JDK version reaches the 'accept_until' 234 * limit, we flatly refuse to admit the existence of the flag. This allows 235 * a flag to die correctly over JDK releases using HSX. 236 */ 237 typedef struct { 238 const char* name; 239 JDK_Version obsoleted_in; // when the flag went away 240 JDK_Version accept_until; // which version to start denying the existence 241 } ObsoleteFlag; 242 243 static ObsoleteFlag obsolete_jvm_flags[] = { 244 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 245 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 246 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 258 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 259 { "DefaultInitialRAMFraction", 260 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 261 { "UseDepthFirstScavengeOrder", 262 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 263 { "HandlePromotionFailure", 264 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 265 { "MaxLiveObjectEvacuationRatio", 266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 267 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 268 { "UseParallelOldGCCompacting", 269 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 270 { "UseParallelDensePrefixUpdate", 271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 272 { "UseParallelOldGCDensePrefix", 273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 274 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 275 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 276 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 277 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 278 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 295 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 296 #ifdef PRODUCT 297 { "DesiredMethodLimit", 298 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 299 #endif // PRODUCT 300 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 302 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 303 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 304 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 305 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 306 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 307 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 308 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 309 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 310 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 311 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 312 #ifndef ZERO 313 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 314 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 315 #endif // ZERO 316 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 317 { NULL, JDK_Version(0), JDK_Version(0) } 318 }; 319 320 // Returns true if the flag is obsolete and fits into the range specified 321 // for being ignored. In the case that the flag is ignored, the 'version' 322 // value is filled in with the version number when the flag became 323 // obsolete so that that value can be displayed to the user. 324 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 325 int i = 0; 326 assert(version != NULL, "Must provide a version buffer"); 327 while (obsolete_jvm_flags[i].name != NULL) { 328 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 329 // <flag>=xxx form 330 // [-|+]<flag> form 331 size_t len = strlen(flag_status.name); 332 if (((strncmp(flag_status.name, s, len) == 0) && 333 (strlen(s) == len)) || 334 ((s[0] == '+' || s[0] == '-') && 335 (strncmp(flag_status.name, &s[1], len) == 0) && 336 (strlen(&s[1]) == len))) { 337 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 338 *version = flag_status.obsoleted_in; 339 return true; 340 } 341 } 342 i++; 343 } 344 return false; 345 } 346 347 // Constructs the system class path (aka boot class path) from the following 348 // components, in order: 349 // 350 // prefix // from -Xbootclasspath/p:... 351 // endorsed // the expansion of -Djava.endorsed.dirs=... 352 // base // from os::get_system_properties() or -Xbootclasspath= 353 // suffix // from -Xbootclasspath/a:... 354 // 355 // java.endorsed.dirs is a list of directories; any jar or zip files in the 356 // directories are added to the sysclasspath just before the base. 357 // 358 // This could be AllStatic, but it isn't needed after argument processing is 359 // complete. 360 class SysClassPath: public StackObj { 361 public: 362 SysClassPath(const char* base); 363 ~SysClassPath(); 364 365 inline void set_base(const char* base); 366 inline void add_prefix(const char* prefix); 367 inline void add_suffix_to_prefix(const char* suffix); 368 inline void add_suffix(const char* suffix); 369 inline void reset_path(const char* base); 370 371 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 372 // property. Must be called after all command-line arguments have been 373 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 374 // combined_path(). 375 void expand_endorsed(); 376 377 inline const char* get_base() const { return _items[_scp_base]; } 378 inline const char* get_prefix() const { return _items[_scp_prefix]; } 379 inline const char* get_suffix() const { return _items[_scp_suffix]; } 380 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 381 382 // Combine all the components into a single c-heap-allocated string; caller 383 // must free the string if/when no longer needed. 384 char* combined_path(); 385 386 private: 387 // Utility routines. 388 static char* add_to_path(const char* path, const char* str, bool prepend); 389 static char* add_jars_to_path(char* path, const char* directory); 390 391 inline void reset_item_at(int index); 392 393 // Array indices for the items that make up the sysclasspath. All except the 394 // base are allocated in the C heap and freed by this class. 395 enum { 396 _scp_prefix, // from -Xbootclasspath/p:... 397 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 398 _scp_base, // the default sysclasspath 399 _scp_suffix, // from -Xbootclasspath/a:... 400 _scp_nitems // the number of items, must be last. 401 }; 402 403 const char* _items[_scp_nitems]; 404 DEBUG_ONLY(bool _expansion_done;) 405 }; 406 407 SysClassPath::SysClassPath(const char* base) { 408 memset(_items, 0, sizeof(_items)); 409 _items[_scp_base] = base; 410 DEBUG_ONLY(_expansion_done = false;) 411 } 412 413 SysClassPath::~SysClassPath() { 414 // Free everything except the base. 415 for (int i = 0; i < _scp_nitems; ++i) { 416 if (i != _scp_base) reset_item_at(i); 417 } 418 DEBUG_ONLY(_expansion_done = false;) 419 } 420 421 inline void SysClassPath::set_base(const char* base) { 422 _items[_scp_base] = base; 423 } 424 425 inline void SysClassPath::add_prefix(const char* prefix) { 426 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 427 } 428 429 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 430 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 431 } 432 433 inline void SysClassPath::add_suffix(const char* suffix) { 434 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 435 } 436 437 inline void SysClassPath::reset_item_at(int index) { 438 assert(index < _scp_nitems && index != _scp_base, "just checking"); 439 if (_items[index] != NULL) { 440 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 441 _items[index] = NULL; 442 } 443 } 444 445 inline void SysClassPath::reset_path(const char* base) { 446 // Clear the prefix and suffix. 447 reset_item_at(_scp_prefix); 448 reset_item_at(_scp_suffix); 449 set_base(base); 450 } 451 452 //------------------------------------------------------------------------------ 453 454 void SysClassPath::expand_endorsed() { 455 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 456 457 const char* path = Arguments::get_property("java.endorsed.dirs"); 458 if (path == NULL) { 459 path = Arguments::get_endorsed_dir(); 460 assert(path != NULL, "no default for java.endorsed.dirs"); 461 } 462 463 char* expanded_path = NULL; 464 const char separator = *os::path_separator(); 465 const char* const end = path + strlen(path); 466 while (path < end) { 467 const char* tmp_end = strchr(path, separator); 468 if (tmp_end == NULL) { 469 expanded_path = add_jars_to_path(expanded_path, path); 470 path = end; 471 } else { 472 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 473 memcpy(dirpath, path, tmp_end - path); 474 dirpath[tmp_end - path] = '\0'; 475 expanded_path = add_jars_to_path(expanded_path, dirpath); 476 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 477 path = tmp_end + 1; 478 } 479 } 480 _items[_scp_endorsed] = expanded_path; 481 DEBUG_ONLY(_expansion_done = true;) 482 } 483 484 // Combine the bootclasspath elements, some of which may be null, into a single 485 // c-heap-allocated string. 486 char* SysClassPath::combined_path() { 487 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 488 assert(_expansion_done, "must call expand_endorsed() first."); 489 490 size_t lengths[_scp_nitems]; 491 size_t total_len = 0; 492 493 const char separator = *os::path_separator(); 494 495 // Get the lengths. 496 int i; 497 for (i = 0; i < _scp_nitems; ++i) { 498 if (_items[i] != NULL) { 499 lengths[i] = strlen(_items[i]); 500 // Include space for the separator char (or a NULL for the last item). 501 total_len += lengths[i] + 1; 502 } 503 } 504 assert(total_len > 0, "empty sysclasspath not allowed"); 505 506 // Copy the _items to a single string. 507 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 508 char* cp_tmp = cp; 509 for (i = 0; i < _scp_nitems; ++i) { 510 if (_items[i] != NULL) { 511 memcpy(cp_tmp, _items[i], lengths[i]); 512 cp_tmp += lengths[i]; 513 *cp_tmp++ = separator; 514 } 515 } 516 *--cp_tmp = '\0'; // Replace the extra separator. 517 return cp; 518 } 519 520 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 521 char* 522 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 523 char *cp; 524 525 assert(str != NULL, "just checking"); 526 if (path == NULL) { 527 size_t len = strlen(str) + 1; 528 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 529 memcpy(cp, str, len); // copy the trailing null 530 } else { 531 const char separator = *os::path_separator(); 532 size_t old_len = strlen(path); 533 size_t str_len = strlen(str); 534 size_t len = old_len + str_len + 2; 535 536 if (prepend) { 537 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 538 char* cp_tmp = cp; 539 memcpy(cp_tmp, str, str_len); 540 cp_tmp += str_len; 541 *cp_tmp = separator; 542 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 543 FREE_C_HEAP_ARRAY(char, path, mtInternal); 544 } else { 545 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 546 char* cp_tmp = cp + old_len; 547 *cp_tmp = separator; 548 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 549 } 550 } 551 return cp; 552 } 553 554 // Scan the directory and append any jar or zip files found to path. 555 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 556 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 557 DIR* dir = os::opendir(directory); 558 if (dir == NULL) return path; 559 560 char dir_sep[2] = { '\0', '\0' }; 561 size_t directory_len = strlen(directory); 562 const char fileSep = *os::file_separator(); 563 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 564 565 /* Scan the directory for jars/zips, appending them to path. */ 566 struct dirent *entry; 567 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 568 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 569 const char* name = entry->d_name; 570 const char* ext = name + strlen(name) - 4; 571 bool isJarOrZip = ext > name && 572 (os::file_name_strcmp(ext, ".jar") == 0 || 573 os::file_name_strcmp(ext, ".zip") == 0); 574 if (isJarOrZip) { 575 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 576 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 577 path = add_to_path(path, jarpath, false); 578 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 579 } 580 } 581 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 582 os::closedir(dir); 583 return path; 584 } 585 586 // Parses a memory size specification string. 587 static bool atomull(const char *s, julong* result) { 588 julong n = 0; 589 int args_read = 0; 590 bool is_hex = false; 591 // Skip leading 0[xX] for hexadecimal 592 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 593 s += 2; 594 is_hex = true; 595 args_read = sscanf(s, JULONG_FORMAT_X, &n); 596 } else { 597 args_read = sscanf(s, JULONG_FORMAT, &n); 598 } 599 if (args_read != 1) { 600 return false; 601 } 602 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 603 s++; 604 } 605 // 4705540: illegal if more characters are found after the first non-digit 606 if (strlen(s) > 1) { 607 return false; 608 } 609 switch (*s) { 610 case 'T': case 't': 611 *result = n * G * K; 612 // Check for overflow. 613 if (*result/((julong)G * K) != n) return false; 614 return true; 615 case 'G': case 'g': 616 *result = n * G; 617 if (*result/G != n) return false; 618 return true; 619 case 'M': case 'm': 620 *result = n * M; 621 if (*result/M != n) return false; 622 return true; 623 case 'K': case 'k': 624 *result = n * K; 625 if (*result/K != n) return false; 626 return true; 627 case '\0': 628 *result = n; 629 return true; 630 default: 631 return false; 632 } 633 } 634 635 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 636 if (size < min_size) return arg_too_small; 637 // Check that size will fit in a size_t (only relevant on 32-bit) 638 if (size > max_uintx) return arg_too_big; 639 return arg_in_range; 640 } 641 642 // Describe an argument out of range error 643 void Arguments::describe_range_error(ArgsRange errcode) { 644 switch(errcode) { 645 case arg_too_big: 646 jio_fprintf(defaultStream::error_stream(), 647 "The specified size exceeds the maximum " 648 "representable size.\n"); 649 break; 650 case arg_too_small: 651 case arg_unreadable: 652 case arg_in_range: 653 // do nothing for now 654 break; 655 default: 656 ShouldNotReachHere(); 657 } 658 } 659 660 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 661 return CommandLineFlags::boolAtPut(name, &value, origin); 662 } 663 664 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 665 double v; 666 if (sscanf(value, "%lf", &v) != 1) { 667 return false; 668 } 669 670 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 671 return true; 672 } 673 return false; 674 } 675 676 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 677 julong v; 678 intx intx_v; 679 bool is_neg = false; 680 // Check the sign first since atomull() parses only unsigned values. 681 if (*value == '-') { 682 if (!CommandLineFlags::intxAt(name, &intx_v)) { 683 return false; 684 } 685 value++; 686 is_neg = true; 687 } 688 if (!atomull(value, &v)) { 689 return false; 690 } 691 intx_v = (intx) v; 692 if (is_neg) { 693 intx_v = -intx_v; 694 } 695 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 696 return true; 697 } 698 uintx uintx_v = (uintx) v; 699 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 700 return true; 701 } 702 uint64_t uint64_t_v = (uint64_t) v; 703 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 704 return true; 705 } 706 size_t size_t_v = (size_t) v; 707 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 708 return true; 709 } 710 return false; 711 } 712 713 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 714 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 715 // Contract: CommandLineFlags always returns a pointer that needs freeing. 716 FREE_C_HEAP_ARRAY(char, value, mtInternal); 717 return true; 718 } 719 720 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 721 const char* old_value = ""; 722 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 723 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 724 size_t new_len = strlen(new_value); 725 const char* value; 726 char* free_this_too = NULL; 727 if (old_len == 0) { 728 value = new_value; 729 } else if (new_len == 0) { 730 value = old_value; 731 } else { 732 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 733 // each new setting adds another LINE to the switch: 734 sprintf(buf, "%s\n%s", old_value, new_value); 735 value = buf; 736 free_this_too = buf; 737 } 738 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 739 // CommandLineFlags always returns a pointer that needs freeing. 740 FREE_C_HEAP_ARRAY(char, value, mtInternal); 741 if (free_this_too != NULL) { 742 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 743 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 744 } 745 return true; 746 } 747 748 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 749 750 // range of acceptable characters spelled out for portability reasons 751 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 752 #define BUFLEN 255 753 char name[BUFLEN+1]; 754 char dummy; 755 756 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 757 return set_bool_flag(name, false, origin); 758 } 759 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 760 return set_bool_flag(name, true, origin); 761 } 762 763 char punct; 764 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 765 const char* value = strchr(arg, '=') + 1; 766 Flag* flag = Flag::find_flag(name, strlen(name)); 767 if (flag != NULL && flag->is_ccstr()) { 768 if (flag->ccstr_accumulates()) { 769 return append_to_string_flag(name, value, origin); 770 } else { 771 if (value[0] == '\0') { 772 value = NULL; 773 } 774 return set_string_flag(name, value, origin); 775 } 776 } 777 } 778 779 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 780 const char* value = strchr(arg, '=') + 1; 781 // -XX:Foo:=xxx will reset the string flag to the given value. 782 if (value[0] == '\0') { 783 value = NULL; 784 } 785 return set_string_flag(name, value, origin); 786 } 787 788 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 789 #define SIGNED_NUMBER_RANGE "[-0123456789]" 790 #define NUMBER_RANGE "[0123456789]" 791 char value[BUFLEN + 1]; 792 char value2[BUFLEN + 1]; 793 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 794 // Looks like a floating-point number -- try again with more lenient format string 795 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 796 return set_fp_numeric_flag(name, value, origin); 797 } 798 } 799 800 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 801 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 802 return set_numeric_flag(name, value, origin); 803 } 804 805 return false; 806 } 807 808 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 809 assert(bldarray != NULL, "illegal argument"); 810 811 if (arg == NULL) { 812 return; 813 } 814 815 int new_count = *count + 1; 816 817 // expand the array and add arg to the last element 818 if (*bldarray == NULL) { 819 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 820 } else { 821 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 822 } 823 (*bldarray)[*count] = os::strdup_check_oom(arg); 824 *count = new_count; 825 } 826 827 void Arguments::build_jvm_args(const char* arg) { 828 add_string(&_jvm_args_array, &_num_jvm_args, arg); 829 } 830 831 void Arguments::build_jvm_flags(const char* arg) { 832 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 833 } 834 835 // utility function to return a string that concatenates all 836 // strings in a given char** array 837 const char* Arguments::build_resource_string(char** args, int count) { 838 if (args == NULL || count == 0) { 839 return NULL; 840 } 841 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 842 for (int i = 1; i < count; i++) { 843 length += strlen(args[i]) + 1; // add 1 for a space 844 } 845 char* s = NEW_RESOURCE_ARRAY(char, length); 846 strcpy(s, args[0]); 847 for (int j = 1; j < count; j++) { 848 strcat(s, " "); 849 strcat(s, args[j]); 850 } 851 return (const char*) s; 852 } 853 854 void Arguments::print_on(outputStream* st) { 855 st->print_cr("VM Arguments:"); 856 if (num_jvm_flags() > 0) { 857 st->print("jvm_flags: "); print_jvm_flags_on(st); 858 } 859 if (num_jvm_args() > 0) { 860 st->print("jvm_args: "); print_jvm_args_on(st); 861 } 862 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 863 if (_java_class_path != NULL) { 864 char* path = _java_class_path->value(); 865 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 866 } 867 st->print_cr("Launcher Type: %s", _sun_java_launcher); 868 } 869 870 void Arguments::print_jvm_flags_on(outputStream* st) { 871 if (_num_jvm_flags > 0) { 872 for (int i=0; i < _num_jvm_flags; i++) { 873 st->print("%s ", _jvm_flags_array[i]); 874 } 875 st->cr(); 876 } 877 } 878 879 void Arguments::print_jvm_args_on(outputStream* st) { 880 if (_num_jvm_args > 0) { 881 for (int i=0; i < _num_jvm_args; i++) { 882 st->print("%s ", _jvm_args_array[i]); 883 } 884 st->cr(); 885 } 886 } 887 888 bool Arguments::process_argument(const char* arg, 889 jboolean ignore_unrecognized, Flag::Flags origin) { 890 891 JDK_Version since = JDK_Version(); 892 893 if (parse_argument(arg, origin) || ignore_unrecognized) { 894 return true; 895 } 896 897 bool has_plus_minus = (*arg == '+' || *arg == '-'); 898 const char* const argname = has_plus_minus ? arg + 1 : arg; 899 if (is_newly_obsolete(arg, &since)) { 900 char version[256]; 901 since.to_string(version, sizeof(version)); 902 warning("ignoring option %s; support was removed in %s", argname, version); 903 return true; 904 } 905 906 // For locked flags, report a custom error message if available. 907 // Otherwise, report the standard unrecognized VM option. 908 909 size_t arg_len; 910 const char* equal_sign = strchr(argname, '='); 911 if (equal_sign == NULL) { 912 arg_len = strlen(argname); 913 } else { 914 arg_len = equal_sign - argname; 915 } 916 917 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 918 if (found_flag != NULL) { 919 char locked_message_buf[BUFLEN]; 920 found_flag->get_locked_message(locked_message_buf, BUFLEN); 921 if (strlen(locked_message_buf) == 0) { 922 if (found_flag->is_bool() && !has_plus_minus) { 923 jio_fprintf(defaultStream::error_stream(), 924 "Missing +/- setting for VM option '%s'\n", argname); 925 } else if (!found_flag->is_bool() && has_plus_minus) { 926 jio_fprintf(defaultStream::error_stream(), 927 "Unexpected +/- setting in VM option '%s'\n", argname); 928 } else { 929 jio_fprintf(defaultStream::error_stream(), 930 "Improperly specified VM option '%s'\n", argname); 931 } 932 } else { 933 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 934 } 935 } else { 936 jio_fprintf(defaultStream::error_stream(), 937 "Unrecognized VM option '%s'\n", argname); 938 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 939 if (fuzzy_matched != NULL) { 940 jio_fprintf(defaultStream::error_stream(), 941 "Did you mean '%s%s%s'? ", 942 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 943 fuzzy_matched->_name, 944 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 945 if (is_newly_obsolete(fuzzy_matched->_name, &since)) { 946 char version[256]; 947 since.to_string(version, sizeof(version)); 948 jio_fprintf(defaultStream::error_stream(), 949 "Warning: support for %s was removed in %s\n", 950 fuzzy_matched->_name, 951 version); 952 } 953 } 954 } 955 956 // allow for commandline "commenting out" options like -XX:#+Verbose 957 return arg[0] == '#'; 958 } 959 960 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 961 FILE* stream = fopen(file_name, "rb"); 962 if (stream == NULL) { 963 if (should_exist) { 964 jio_fprintf(defaultStream::error_stream(), 965 "Could not open settings file %s\n", file_name); 966 return false; 967 } else { 968 return true; 969 } 970 } 971 972 char token[1024]; 973 int pos = 0; 974 975 bool in_white_space = true; 976 bool in_comment = false; 977 bool in_quote = false; 978 char quote_c = 0; 979 bool result = true; 980 981 int c = getc(stream); 982 while(c != EOF && pos < (int)(sizeof(token)-1)) { 983 if (in_white_space) { 984 if (in_comment) { 985 if (c == '\n') in_comment = false; 986 } else { 987 if (c == '#') in_comment = true; 988 else if (!isspace(c)) { 989 in_white_space = false; 990 token[pos++] = c; 991 } 992 } 993 } else { 994 if (c == '\n' || (!in_quote && isspace(c))) { 995 // token ends at newline, or at unquoted whitespace 996 // this allows a way to include spaces in string-valued options 997 token[pos] = '\0'; 998 logOption(token); 999 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1000 build_jvm_flags(token); 1001 pos = 0; 1002 in_white_space = true; 1003 in_quote = false; 1004 } else if (!in_quote && (c == '\'' || c == '"')) { 1005 in_quote = true; 1006 quote_c = c; 1007 } else if (in_quote && (c == quote_c)) { 1008 in_quote = false; 1009 } else { 1010 token[pos++] = c; 1011 } 1012 } 1013 c = getc(stream); 1014 } 1015 if (pos > 0) { 1016 token[pos] = '\0'; 1017 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1018 build_jvm_flags(token); 1019 } 1020 fclose(stream); 1021 return result; 1022 } 1023 1024 //============================================================================================================= 1025 // Parsing of properties (-D) 1026 1027 const char* Arguments::get_property(const char* key) { 1028 return PropertyList_get_value(system_properties(), key); 1029 } 1030 1031 bool Arguments::add_property(const char* prop) { 1032 const char* eq = strchr(prop, '='); 1033 char* key; 1034 // ns must be static--its address may be stored in a SystemProperty object. 1035 const static char ns[1] = {0}; 1036 char* value = (char *)ns; 1037 1038 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1039 key = AllocateHeap(key_len + 1, mtInternal); 1040 strncpy(key, prop, key_len); 1041 key[key_len] = '\0'; 1042 1043 if (eq != NULL) { 1044 size_t value_len = strlen(prop) - key_len - 1; 1045 value = AllocateHeap(value_len + 1, mtInternal); 1046 strncpy(value, &prop[key_len + 1], value_len + 1); 1047 } 1048 1049 if (strcmp(key, "java.compiler") == 0) { 1050 process_java_compiler_argument(value); 1051 FreeHeap(key); 1052 if (eq != NULL) { 1053 FreeHeap(value); 1054 } 1055 return true; 1056 } else if (strcmp(key, "sun.java.command") == 0) { 1057 _java_command = value; 1058 1059 // Record value in Arguments, but let it get passed to Java. 1060 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1061 strcmp(key, "sun.java.launcher.pid") == 0) { 1062 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1063 // private and are processed in process_sun_java_launcher_properties(); 1064 // the sun.java.launcher property is passed on to the java application 1065 FreeHeap(key); 1066 if (eq != NULL) { 1067 FreeHeap(value); 1068 } 1069 return true; 1070 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1071 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1072 // its value without going through the property list or making a Java call. 1073 _java_vendor_url_bug = value; 1074 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1075 PropertyList_unique_add(&_system_properties, key, value, true); 1076 return true; 1077 } 1078 // Create new property and add at the end of the list 1079 PropertyList_unique_add(&_system_properties, key, value); 1080 return true; 1081 } 1082 1083 //=========================================================================================================== 1084 // Setting int/mixed/comp mode flags 1085 1086 void Arguments::set_mode_flags(Mode mode) { 1087 // Set up default values for all flags. 1088 // If you add a flag to any of the branches below, 1089 // add a default value for it here. 1090 set_java_compiler(false); 1091 _mode = mode; 1092 1093 // Ensure Agent_OnLoad has the correct initial values. 1094 // This may not be the final mode; mode may change later in onload phase. 1095 PropertyList_unique_add(&_system_properties, "java.vm.info", 1096 (char*)VM_Version::vm_info_string(), false); 1097 1098 UseInterpreter = true; 1099 UseCompiler = true; 1100 UseLoopCounter = true; 1101 1102 // Default values may be platform/compiler dependent - 1103 // use the saved values 1104 ClipInlining = Arguments::_ClipInlining; 1105 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1106 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1107 BackgroundCompilation = Arguments::_BackgroundCompilation; 1108 1109 // Change from defaults based on mode 1110 switch (mode) { 1111 default: 1112 ShouldNotReachHere(); 1113 break; 1114 case _int: 1115 UseCompiler = false; 1116 UseLoopCounter = false; 1117 AlwaysCompileLoopMethods = false; 1118 UseOnStackReplacement = false; 1119 break; 1120 case _mixed: 1121 // same as default 1122 break; 1123 case _comp: 1124 UseInterpreter = false; 1125 BackgroundCompilation = false; 1126 ClipInlining = false; 1127 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1128 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1129 // compile a level 4 (C2) and then continue executing it. 1130 if (TieredCompilation) { 1131 Tier3InvokeNotifyFreqLog = 0; 1132 Tier4InvocationThreshold = 0; 1133 } 1134 break; 1135 } 1136 } 1137 1138 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1139 // Conflict: required to use shared spaces (-Xshare:on), but 1140 // incompatible command line options were chosen. 1141 1142 static void no_shared_spaces(const char* message) { 1143 if (RequireSharedSpaces) { 1144 jio_fprintf(defaultStream::error_stream(), 1145 "Class data sharing is inconsistent with other specified options.\n"); 1146 vm_exit_during_initialization("Unable to use shared archive.", message); 1147 } else { 1148 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1149 } 1150 } 1151 #endif 1152 1153 // Returns threshold scaled with CompileThresholdScaling 1154 intx Arguments::get_scaled_compile_threshold(intx threshold) { 1155 return (intx)(threshold * CompileThresholdScaling); 1156 } 1157 1158 // Returns freq_log scaled with CompileThresholdScaling 1159 intx Arguments::get_scaled_freq_log(intx freq_log) { 1160 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log); 1161 if (scaled_freq == 0) { 1162 return 0; 1163 } else { 1164 return log2_intptr(scaled_freq); 1165 } 1166 } 1167 1168 void Arguments::set_tiered_flags() { 1169 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1170 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1171 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1172 } 1173 if (CompilationPolicyChoice < 2) { 1174 vm_exit_during_initialization( 1175 "Incompatible compilation policy selected", NULL); 1176 } 1177 // Increase the code cache size - tiered compiles a lot more. 1178 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1179 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1180 } 1181 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1182 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1183 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1184 1185 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1186 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1187 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1188 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1189 } 1190 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1191 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1192 } 1193 // Check consistency of code heap sizes 1194 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1195 jio_fprintf(defaultStream::error_stream(), 1196 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1197 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1198 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1199 vm_exit(1); 1200 } 1201 } 1202 } 1203 if (!UseInterpreter) { // -Xcomp 1204 Tier3InvokeNotifyFreqLog = 0; 1205 Tier4InvocationThreshold = 0; 1206 } 1207 // Scale tiered compilation thresholds 1208 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { 1209 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1210 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1211 1212 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold)); 1213 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold)); 1214 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold)); 1215 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold)); 1216 1217 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1218 // once these thresholds become supported. 1219 1220 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1221 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1222 1223 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1224 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1225 1226 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1227 1228 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold)); 1229 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold)); 1230 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold)); 1231 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold)); 1232 } 1233 } 1234 1235 /** 1236 * Returns the minimum number of compiler threads needed to run the JVM. The following 1237 * configurations are possible. 1238 * 1239 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1240 * compiler threads is 0. 1241 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1242 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1243 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1244 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1245 * C1 can be used, so the minimum number of compiler threads is 1. 1246 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1247 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1248 * the minimum number of compiler threads is 2. 1249 */ 1250 int Arguments::get_min_number_of_compiler_threads() { 1251 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1252 return 0; // case 1 1253 #else 1254 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1255 return 1; // case 2 or case 3 1256 } 1257 return 2; // case 4 (tiered) 1258 #endif 1259 } 1260 1261 #if INCLUDE_ALL_GCS 1262 static void disable_adaptive_size_policy(const char* collector_name) { 1263 if (UseAdaptiveSizePolicy) { 1264 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1265 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1266 collector_name); 1267 } 1268 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1269 } 1270 } 1271 1272 void Arguments::set_parnew_gc_flags() { 1273 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1274 "control point invariant"); 1275 assert(UseParNewGC, "Error"); 1276 1277 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1278 disable_adaptive_size_policy("UseParNewGC"); 1279 1280 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1281 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1282 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1283 } else if (ParallelGCThreads == 0) { 1284 jio_fprintf(defaultStream::error_stream(), 1285 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1286 vm_exit(1); 1287 } 1288 1289 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1290 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1291 // we set them to 1024 and 1024. 1292 // See CR 6362902. 1293 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1294 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1295 } 1296 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1297 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1298 } 1299 1300 // When using compressed oops, we use local overflow stacks, 1301 // rather than using a global overflow list chained through 1302 // the klass word of the object's pre-image. 1303 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1304 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1305 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1306 } 1307 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1308 } 1309 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1310 } 1311 1312 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1313 // sparc/solaris for certain applications, but would gain from 1314 // further optimization and tuning efforts, and would almost 1315 // certainly gain from analysis of platform and environment. 1316 void Arguments::set_cms_and_parnew_gc_flags() { 1317 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1318 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1319 1320 // If we are using CMS, we prefer to UseParNewGC, 1321 // unless explicitly forbidden. 1322 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1323 FLAG_SET_ERGO(bool, UseParNewGC, true); 1324 } 1325 1326 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1327 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1328 1329 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1330 // as needed. 1331 if (UseParNewGC) { 1332 set_parnew_gc_flags(); 1333 } 1334 1335 size_t max_heap = align_size_down(MaxHeapSize, 1336 CardTableRS::ct_max_alignment_constraint()); 1337 1338 // Now make adjustments for CMS 1339 intx tenuring_default = (intx)6; 1340 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1341 1342 // Preferred young gen size for "short" pauses: 1343 // upper bound depends on # of threads and NewRatio. 1344 const uintx parallel_gc_threads = 1345 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1346 const size_t preferred_max_new_size_unaligned = 1347 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1348 size_t preferred_max_new_size = 1349 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1350 1351 // Unless explicitly requested otherwise, size young gen 1352 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1353 1354 // If either MaxNewSize or NewRatio is set on the command line, 1355 // assume the user is trying to set the size of the young gen. 1356 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1357 1358 // Set MaxNewSize to our calculated preferred_max_new_size unless 1359 // NewSize was set on the command line and it is larger than 1360 // preferred_max_new_size. 1361 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1362 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1363 } else { 1364 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1365 } 1366 if (PrintGCDetails && Verbose) { 1367 // Too early to use gclog_or_tty 1368 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1369 } 1370 1371 // Code along this path potentially sets NewSize and OldSize 1372 if (PrintGCDetails && Verbose) { 1373 // Too early to use gclog_or_tty 1374 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1375 " initial_heap_size: " SIZE_FORMAT 1376 " max_heap: " SIZE_FORMAT, 1377 min_heap_size(), InitialHeapSize, max_heap); 1378 } 1379 size_t min_new = preferred_max_new_size; 1380 if (FLAG_IS_CMDLINE(NewSize)) { 1381 min_new = NewSize; 1382 } 1383 if (max_heap > min_new && min_heap_size() > min_new) { 1384 // Unless explicitly requested otherwise, make young gen 1385 // at least min_new, and at most preferred_max_new_size. 1386 if (FLAG_IS_DEFAULT(NewSize)) { 1387 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1388 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1389 if (PrintGCDetails && Verbose) { 1390 // Too early to use gclog_or_tty 1391 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1392 } 1393 } 1394 // Unless explicitly requested otherwise, size old gen 1395 // so it's NewRatio x of NewSize. 1396 if (FLAG_IS_DEFAULT(OldSize)) { 1397 if (max_heap > NewSize) { 1398 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1399 if (PrintGCDetails && Verbose) { 1400 // Too early to use gclog_or_tty 1401 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1402 } 1403 } 1404 } 1405 } 1406 } 1407 // Unless explicitly requested otherwise, definitely 1408 // promote all objects surviving "tenuring_default" scavenges. 1409 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1410 FLAG_IS_DEFAULT(SurvivorRatio)) { 1411 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1412 } 1413 // If we decided above (or user explicitly requested) 1414 // `promote all' (via MaxTenuringThreshold := 0), 1415 // prefer minuscule survivor spaces so as not to waste 1416 // space for (non-existent) survivors 1417 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1418 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1419 } 1420 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1421 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1422 // This is done in order to make ParNew+CMS configuration to work 1423 // with YoungPLABSize and OldPLABSize options. 1424 // See CR 6362902. 1425 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1426 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1427 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1428 // is. In this situation let CMSParPromoteBlocksToClaim follow 1429 // the value (either from the command line or ergonomics) of 1430 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1431 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1432 } else { 1433 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1434 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1435 // we'll let it to take precedence. 1436 jio_fprintf(defaultStream::error_stream(), 1437 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1438 " options are specified for the CMS collector." 1439 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1440 } 1441 } 1442 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1443 // OldPLAB sizing manually turned off: Use a larger default setting, 1444 // unless it was manually specified. This is because a too-low value 1445 // will slow down scavenges. 1446 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1447 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1448 } 1449 } 1450 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1451 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1452 // If either of the static initialization defaults have changed, note this 1453 // modification. 1454 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1455 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1456 } 1457 if (PrintGCDetails && Verbose) { 1458 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1459 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1460 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1461 } 1462 } 1463 #endif // INCLUDE_ALL_GCS 1464 1465 void set_object_alignment() { 1466 // Object alignment. 1467 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1468 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1469 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1470 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1471 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1472 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1473 1474 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1475 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1476 1477 // Oop encoding heap max 1478 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1479 1480 #if INCLUDE_ALL_GCS 1481 // Set CMS global values 1482 CompactibleFreeListSpace::set_cms_values(); 1483 #endif // INCLUDE_ALL_GCS 1484 } 1485 1486 bool verify_object_alignment() { 1487 // Object alignment. 1488 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1489 jio_fprintf(defaultStream::error_stream(), 1490 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1491 (int)ObjectAlignmentInBytes); 1492 return false; 1493 } 1494 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1495 jio_fprintf(defaultStream::error_stream(), 1496 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1497 (int)ObjectAlignmentInBytes, BytesPerLong); 1498 return false; 1499 } 1500 // It does not make sense to have big object alignment 1501 // since a space lost due to alignment will be greater 1502 // then a saved space from compressed oops. 1503 if ((int)ObjectAlignmentInBytes > 256) { 1504 jio_fprintf(defaultStream::error_stream(), 1505 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1506 (int)ObjectAlignmentInBytes); 1507 return false; 1508 } 1509 // In case page size is very small. 1510 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1511 jio_fprintf(defaultStream::error_stream(), 1512 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1513 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1514 return false; 1515 } 1516 if(SurvivorAlignmentInBytes == 0) { 1517 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1518 } else { 1519 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1520 jio_fprintf(defaultStream::error_stream(), 1521 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1522 (int)SurvivorAlignmentInBytes); 1523 return false; 1524 } 1525 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1526 jio_fprintf(defaultStream::error_stream(), 1527 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1528 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1529 return false; 1530 } 1531 } 1532 return true; 1533 } 1534 1535 size_t Arguments::max_heap_for_compressed_oops() { 1536 // Avoid sign flip. 1537 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1538 // We need to fit both the NULL page and the heap into the memory budget, while 1539 // keeping alignment constraints of the heap. To guarantee the latter, as the 1540 // NULL page is located before the heap, we pad the NULL page to the conservative 1541 // maximum alignment that the GC may ever impose upon the heap. 1542 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1543 _conservative_max_heap_alignment); 1544 1545 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1546 NOT_LP64(ShouldNotReachHere(); return 0); 1547 } 1548 1549 bool Arguments::should_auto_select_low_pause_collector() { 1550 if (UseAutoGCSelectPolicy && 1551 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1552 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1553 if (PrintGCDetails) { 1554 // Cannot use gclog_or_tty yet. 1555 tty->print_cr("Automatic selection of the low pause collector" 1556 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1557 } 1558 return true; 1559 } 1560 return false; 1561 } 1562 1563 void Arguments::set_use_compressed_oops() { 1564 #ifndef ZERO 1565 #ifdef _LP64 1566 // MaxHeapSize is not set up properly at this point, but 1567 // the only value that can override MaxHeapSize if we are 1568 // to use UseCompressedOops is InitialHeapSize. 1569 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1570 1571 if (max_heap_size <= max_heap_for_compressed_oops()) { 1572 #if !defined(COMPILER1) || defined(TIERED) 1573 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1574 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1575 } 1576 #endif 1577 #ifdef _WIN64 1578 if (UseLargePages && UseCompressedOops) { 1579 // Cannot allocate guard pages for implicit checks in indexed addressing 1580 // mode, when large pages are specified on windows. 1581 // This flag could be switched ON if narrow oop base address is set to 0, 1582 // see code in Universe::initialize_heap(). 1583 Universe::set_narrow_oop_use_implicit_null_checks(false); 1584 } 1585 #endif // _WIN64 1586 } else { 1587 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1588 warning("Max heap size too large for Compressed Oops"); 1589 FLAG_SET_DEFAULT(UseCompressedOops, false); 1590 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1591 } 1592 } 1593 #endif // _LP64 1594 #endif // ZERO 1595 } 1596 1597 1598 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1599 // set_use_compressed_oops(). 1600 void Arguments::set_use_compressed_klass_ptrs() { 1601 #ifndef ZERO 1602 #ifdef _LP64 1603 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1604 if (!UseCompressedOops) { 1605 if (UseCompressedClassPointers) { 1606 warning("UseCompressedClassPointers requires UseCompressedOops"); 1607 } 1608 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1609 } else { 1610 // Turn on UseCompressedClassPointers too 1611 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1612 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1613 } 1614 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1615 if (UseCompressedClassPointers) { 1616 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1617 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1618 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1619 } 1620 } 1621 } 1622 #endif // _LP64 1623 #endif // !ZERO 1624 } 1625 1626 void Arguments::set_conservative_max_heap_alignment() { 1627 // The conservative maximum required alignment for the heap is the maximum of 1628 // the alignments imposed by several sources: any requirements from the heap 1629 // itself, the collector policy and the maximum page size we may run the VM 1630 // with. 1631 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1632 #if INCLUDE_ALL_GCS 1633 if (UseParallelGC) { 1634 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1635 } else if (UseG1GC) { 1636 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1637 } 1638 #endif // INCLUDE_ALL_GCS 1639 _conservative_max_heap_alignment = MAX4(heap_alignment, 1640 (size_t)os::vm_allocation_granularity(), 1641 os::max_page_size(), 1642 CollectorPolicy::compute_heap_alignment()); 1643 } 1644 1645 void Arguments::select_gc_ergonomically() { 1646 if (os::is_server_class_machine()) { 1647 if (should_auto_select_low_pause_collector()) { 1648 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1649 } else { 1650 FLAG_SET_ERGO(bool, UseParallelGC, true); 1651 } 1652 } 1653 } 1654 1655 void Arguments::select_gc() { 1656 if (!gc_selected()) { 1657 ArgumentsExt::select_gc_ergonomically(); 1658 } 1659 } 1660 1661 void Arguments::set_ergonomics_flags() { 1662 select_gc(); 1663 1664 #ifdef COMPILER2 1665 // Shared spaces work fine with other GCs but causes bytecode rewriting 1666 // to be disabled, which hurts interpreter performance and decreases 1667 // server performance. When -server is specified, keep the default off 1668 // unless it is asked for. Future work: either add bytecode rewriting 1669 // at link time, or rewrite bytecodes in non-shared methods. 1670 if (!DumpSharedSpaces && !RequireSharedSpaces && 1671 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1672 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1673 } 1674 #endif 1675 1676 set_conservative_max_heap_alignment(); 1677 1678 #ifndef ZERO 1679 #ifdef _LP64 1680 set_use_compressed_oops(); 1681 1682 // set_use_compressed_klass_ptrs() must be called after calling 1683 // set_use_compressed_oops(). 1684 set_use_compressed_klass_ptrs(); 1685 1686 // Also checks that certain machines are slower with compressed oops 1687 // in vm_version initialization code. 1688 #endif // _LP64 1689 #endif // !ZERO 1690 } 1691 1692 void Arguments::set_parallel_gc_flags() { 1693 assert(UseParallelGC || UseParallelOldGC, "Error"); 1694 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1695 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1696 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1697 } 1698 FLAG_SET_DEFAULT(UseParallelGC, true); 1699 1700 // If no heap maximum was requested explicitly, use some reasonable fraction 1701 // of the physical memory, up to a maximum of 1GB. 1702 FLAG_SET_DEFAULT(ParallelGCThreads, 1703 Abstract_VM_Version::parallel_worker_threads()); 1704 if (ParallelGCThreads == 0) { 1705 jio_fprintf(defaultStream::error_stream(), 1706 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1707 vm_exit(1); 1708 } 1709 1710 if (UseAdaptiveSizePolicy) { 1711 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1712 // unless the user actually sets these flags. 1713 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1714 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1715 _min_heap_free_ratio = MinHeapFreeRatio; 1716 } 1717 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1718 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1719 _max_heap_free_ratio = MaxHeapFreeRatio; 1720 } 1721 } 1722 1723 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1724 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1725 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1726 // See CR 6362902 for details. 1727 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1728 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1729 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1730 } 1731 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1732 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1733 } 1734 } 1735 1736 if (UseParallelOldGC) { 1737 // Par compact uses lower default values since they are treated as 1738 // minimums. These are different defaults because of the different 1739 // interpretation and are not ergonomically set. 1740 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1741 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1742 } 1743 } 1744 } 1745 1746 void Arguments::set_g1_gc_flags() { 1747 assert(UseG1GC, "Error"); 1748 #ifdef COMPILER1 1749 FastTLABRefill = false; 1750 #endif 1751 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1752 if (ParallelGCThreads == 0) { 1753 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1754 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1755 } 1756 1757 #if INCLUDE_ALL_GCS 1758 if (G1ConcRefinementThreads == 0) { 1759 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1760 } 1761 #endif 1762 1763 // MarkStackSize will be set (if it hasn't been set by the user) 1764 // when concurrent marking is initialized. 1765 // Its value will be based upon the number of parallel marking threads. 1766 // But we do set the maximum mark stack size here. 1767 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1768 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1769 } 1770 1771 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1772 // In G1, we want the default GC overhead goal to be higher than 1773 // say in PS. So we set it here to 10%. Otherwise the heap might 1774 // be expanded more aggressively than we would like it to. In 1775 // fact, even 10% seems to not be high enough in some cases 1776 // (especially small GC stress tests that the main thing they do 1777 // is allocation). We might consider increase it further. 1778 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1779 } 1780 1781 if (PrintGCDetails && Verbose) { 1782 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1783 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1784 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1785 } 1786 } 1787 1788 #if !INCLUDE_ALL_GCS 1789 #ifdef ASSERT 1790 static bool verify_serial_gc_flags() { 1791 return (UseSerialGC && 1792 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1793 UseParallelGC || UseParallelOldGC)); 1794 } 1795 #endif // ASSERT 1796 #endif // INCLUDE_ALL_GCS 1797 1798 void Arguments::set_gc_specific_flags() { 1799 #if INCLUDE_ALL_GCS 1800 // Set per-collector flags 1801 if (UseParallelGC || UseParallelOldGC) { 1802 set_parallel_gc_flags(); 1803 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 1804 set_cms_and_parnew_gc_flags(); 1805 } else if (UseParNewGC) { // Skipped if CMS is set above 1806 set_parnew_gc_flags(); 1807 } else if (UseG1GC) { 1808 set_g1_gc_flags(); 1809 } 1810 check_deprecated_gcs(); 1811 check_deprecated_gc_flags(); 1812 if (AssumeMP && !UseSerialGC) { 1813 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1814 warning("If the number of processors is expected to increase from one, then" 1815 " you should configure the number of parallel GC threads appropriately" 1816 " using -XX:ParallelGCThreads=N"); 1817 } 1818 } 1819 if (MinHeapFreeRatio == 100) { 1820 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1821 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1822 } 1823 #else // INCLUDE_ALL_GCS 1824 assert(verify_serial_gc_flags(), "SerialGC unset"); 1825 #endif // INCLUDE_ALL_GCS 1826 } 1827 1828 julong Arguments::limit_by_allocatable_memory(julong limit) { 1829 julong max_allocatable; 1830 julong result = limit; 1831 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1832 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1833 } 1834 return result; 1835 } 1836 1837 // Use static initialization to get the default before parsing 1838 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1839 1840 void Arguments::set_heap_size() { 1841 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1842 // Deprecated flag 1843 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1844 } 1845 1846 const julong phys_mem = 1847 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1848 : (julong)MaxRAM; 1849 1850 // If the maximum heap size has not been set with -Xmx, 1851 // then set it as fraction of the size of physical memory, 1852 // respecting the maximum and minimum sizes of the heap. 1853 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1854 julong reasonable_max = phys_mem / MaxRAMFraction; 1855 1856 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1857 // Small physical memory, so use a minimum fraction of it for the heap 1858 reasonable_max = phys_mem / MinRAMFraction; 1859 } else { 1860 // Not-small physical memory, so require a heap at least 1861 // as large as MaxHeapSize 1862 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1863 } 1864 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1865 // Limit the heap size to ErgoHeapSizeLimit 1866 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1867 } 1868 if (UseCompressedOops) { 1869 // Limit the heap size to the maximum possible when using compressed oops 1870 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1871 1872 // HeapBaseMinAddress can be greater than default but not less than. 1873 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1874 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1875 // matches compressed oops printing flags 1876 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1877 jio_fprintf(defaultStream::error_stream(), 1878 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1879 " (" UINTX_FORMAT "G) which is greater than value given " 1880 UINTX_FORMAT "\n", 1881 DefaultHeapBaseMinAddress, 1882 DefaultHeapBaseMinAddress/G, 1883 HeapBaseMinAddress); 1884 } 1885 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1886 } 1887 } 1888 1889 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1890 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1891 // but it should be not less than default MaxHeapSize. 1892 max_coop_heap -= HeapBaseMinAddress; 1893 } 1894 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1895 } 1896 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1897 1898 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1899 // An initial heap size was specified on the command line, 1900 // so be sure that the maximum size is consistent. Done 1901 // after call to limit_by_allocatable_memory because that 1902 // method might reduce the allocation size. 1903 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1904 } 1905 1906 if (PrintGCDetails && Verbose) { 1907 // Cannot use gclog_or_tty yet. 1908 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1909 } 1910 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1911 } 1912 1913 // If the minimum or initial heap_size have not been set or requested to be set 1914 // ergonomically, set them accordingly. 1915 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1916 julong reasonable_minimum = (julong)(OldSize + NewSize); 1917 1918 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1919 1920 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1921 1922 if (InitialHeapSize == 0) { 1923 julong reasonable_initial = phys_mem / InitialRAMFraction; 1924 1925 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1926 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1927 1928 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1929 1930 if (PrintGCDetails && Verbose) { 1931 // Cannot use gclog_or_tty yet. 1932 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1933 } 1934 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1935 } 1936 // If the minimum heap size has not been set (via -Xms), 1937 // synchronize with InitialHeapSize to avoid errors with the default value. 1938 if (min_heap_size() == 0) { 1939 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1940 if (PrintGCDetails && Verbose) { 1941 // Cannot use gclog_or_tty yet. 1942 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1943 } 1944 } 1945 } 1946 } 1947 1948 // This must be called after ergonomics because we want bytecode rewriting 1949 // if the server compiler is used, or if UseSharedSpaces is disabled. 1950 void Arguments::set_bytecode_flags() { 1951 // Better not attempt to store into a read-only space. 1952 if (UseSharedSpaces) { 1953 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1954 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1955 } 1956 1957 if (!RewriteBytecodes) { 1958 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1959 } 1960 } 1961 1962 // Aggressive optimization flags -XX:+AggressiveOpts 1963 void Arguments::set_aggressive_opts_flags() { 1964 #ifdef COMPILER2 1965 if (AggressiveUnboxing) { 1966 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1967 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1968 } else if (!EliminateAutoBox) { 1969 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1970 AggressiveUnboxing = false; 1971 } 1972 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1973 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1974 } else if (!DoEscapeAnalysis) { 1975 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1976 AggressiveUnboxing = false; 1977 } 1978 } 1979 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1980 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1981 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1982 } 1983 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1984 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1985 } 1986 1987 // Feed the cache size setting into the JDK 1988 char buffer[1024]; 1989 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1990 add_property(buffer); 1991 } 1992 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1993 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1994 } 1995 #endif 1996 1997 if (AggressiveOpts) { 1998 // Sample flag setting code 1999 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2000 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2001 // } 2002 } 2003 } 2004 2005 //=========================================================================================================== 2006 // Parsing of java.compiler property 2007 2008 void Arguments::process_java_compiler_argument(char* arg) { 2009 // For backwards compatibility, Djava.compiler=NONE or "" 2010 // causes us to switch to -Xint mode UNLESS -Xdebug 2011 // is also specified. 2012 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2013 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2014 } 2015 } 2016 2017 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2018 _sun_java_launcher = os::strdup_check_oom(launcher); 2019 } 2020 2021 bool Arguments::created_by_java_launcher() { 2022 assert(_sun_java_launcher != NULL, "property must have value"); 2023 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2024 } 2025 2026 bool Arguments::sun_java_launcher_is_altjvm() { 2027 return _sun_java_launcher_is_altjvm; 2028 } 2029 2030 //=========================================================================================================== 2031 // Parsing of main arguments 2032 2033 bool Arguments::verify_interval(uintx val, uintx min, 2034 uintx max, const char* name) { 2035 // Returns true iff value is in the inclusive interval [min..max] 2036 // false, otherwise. 2037 if (val >= min && val <= max) { 2038 return true; 2039 } 2040 jio_fprintf(defaultStream::error_stream(), 2041 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 2042 " and " UINTX_FORMAT "\n", 2043 name, val, min, max); 2044 return false; 2045 } 2046 2047 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 2048 // Returns true if given value is at least specified min threshold 2049 // false, otherwise. 2050 if (val >= min ) { 2051 return true; 2052 } 2053 jio_fprintf(defaultStream::error_stream(), 2054 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 2055 name, val, min); 2056 return false; 2057 } 2058 2059 bool Arguments::verify_percentage(uintx value, const char* name) { 2060 if (is_percentage(value)) { 2061 return true; 2062 } 2063 jio_fprintf(defaultStream::error_stream(), 2064 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2065 name, value); 2066 return false; 2067 } 2068 2069 // check if do gclog rotation 2070 // +UseGCLogFileRotation is a must, 2071 // no gc log rotation when log file not supplied or 2072 // NumberOfGCLogFiles is 0 2073 void check_gclog_consistency() { 2074 if (UseGCLogFileRotation) { 2075 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2076 jio_fprintf(defaultStream::output_stream(), 2077 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2078 "where num_of_file > 0\n" 2079 "GC log rotation is turned off\n"); 2080 UseGCLogFileRotation = false; 2081 } 2082 } 2083 2084 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2085 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2086 jio_fprintf(defaultStream::output_stream(), 2087 "GCLogFileSize changed to minimum 8K\n"); 2088 } 2089 } 2090 2091 // This function is called for -Xloggc:<filename>, it can be used 2092 // to check if a given file name(or string) conforms to the following 2093 // specification: 2094 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2095 // %p and %t only allowed once. We only limit usage of filename not path 2096 bool is_filename_valid(const char *file_name) { 2097 const char* p = file_name; 2098 char file_sep = os::file_separator()[0]; 2099 const char* cp; 2100 // skip prefix path 2101 for (cp = file_name; *cp != '\0'; cp++) { 2102 if (*cp == '/' || *cp == file_sep) { 2103 p = cp + 1; 2104 } 2105 } 2106 2107 int count_p = 0; 2108 int count_t = 0; 2109 while (*p != '\0') { 2110 if ((*p >= '0' && *p <= '9') || 2111 (*p >= 'A' && *p <= 'Z') || 2112 (*p >= 'a' && *p <= 'z') || 2113 *p == '-' || 2114 *p == '_' || 2115 *p == '.') { 2116 p++; 2117 continue; 2118 } 2119 if (*p == '%') { 2120 if(*(p + 1) == 'p') { 2121 p += 2; 2122 count_p ++; 2123 continue; 2124 } 2125 if (*(p + 1) == 't') { 2126 p += 2; 2127 count_t ++; 2128 continue; 2129 } 2130 } 2131 return false; 2132 } 2133 return count_p < 2 && count_t < 2; 2134 } 2135 2136 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2137 if (!is_percentage(min_heap_free_ratio)) { 2138 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2139 return false; 2140 } 2141 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2142 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2143 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2144 MaxHeapFreeRatio); 2145 return false; 2146 } 2147 // This does not set the flag itself, but stores the value in a safe place for later usage. 2148 _min_heap_free_ratio = min_heap_free_ratio; 2149 return true; 2150 } 2151 2152 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2153 if (!is_percentage(max_heap_free_ratio)) { 2154 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2155 return false; 2156 } 2157 if (max_heap_free_ratio < MinHeapFreeRatio) { 2158 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2159 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2160 MinHeapFreeRatio); 2161 return false; 2162 } 2163 // This does not set the flag itself, but stores the value in a safe place for later usage. 2164 _max_heap_free_ratio = max_heap_free_ratio; 2165 return true; 2166 } 2167 2168 // Check consistency of GC selection 2169 bool Arguments::check_gc_consistency_user() { 2170 check_gclog_consistency(); 2171 bool status = true; 2172 // Ensure that the user has not selected conflicting sets 2173 // of collectors. [Note: this check is merely a user convenience; 2174 // collectors over-ride each other so that only a non-conflicting 2175 // set is selected; however what the user gets is not what they 2176 // may have expected from the combination they asked for. It's 2177 // better to reduce user confusion by not allowing them to 2178 // select conflicting combinations. 2179 uint i = 0; 2180 if (UseSerialGC) i++; 2181 if (UseConcMarkSweepGC || UseParNewGC) i++; 2182 if (UseParallelGC || UseParallelOldGC) i++; 2183 if (UseG1GC) i++; 2184 if (i > 1) { 2185 jio_fprintf(defaultStream::error_stream(), 2186 "Conflicting collector combinations in option list; " 2187 "please refer to the release notes for the combinations " 2188 "allowed\n"); 2189 status = false; 2190 } 2191 return status; 2192 } 2193 2194 void Arguments::check_deprecated_gcs() { 2195 if (UseConcMarkSweepGC && !UseParNewGC) { 2196 warning("Using the DefNew young collector with the CMS collector is deprecated " 2197 "and will likely be removed in a future release"); 2198 } 2199 2200 if (UseParNewGC && !UseConcMarkSweepGC) { 2201 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2202 // set up UseSerialGC properly, so that can't be used in the check here. 2203 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2204 "and will likely be removed in a future release"); 2205 } 2206 } 2207 2208 void Arguments::check_deprecated_gc_flags() { 2209 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2210 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2211 "and will likely be removed in future release"); 2212 } 2213 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2214 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2215 "Use MaxRAMFraction instead."); 2216 } 2217 } 2218 2219 // Check stack pages settings 2220 bool Arguments::check_stack_pages() 2221 { 2222 bool status = true; 2223 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2224 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2225 // greater stack shadow pages can't generate instruction to bang stack 2226 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2227 return status; 2228 } 2229 2230 // Check the consistency of vm_init_args 2231 bool Arguments::check_vm_args_consistency() { 2232 // Method for adding checks for flag consistency. 2233 // The intent is to warn the user of all possible conflicts, 2234 // before returning an error. 2235 // Note: Needs platform-dependent factoring. 2236 bool status = true; 2237 2238 if (TLABRefillWasteFraction == 0) { 2239 jio_fprintf(defaultStream::error_stream(), 2240 "TLABRefillWasteFraction should be a denominator, " 2241 "not " SIZE_FORMAT "\n", 2242 TLABRefillWasteFraction); 2243 status = false; 2244 } 2245 2246 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2247 "AdaptiveSizePolicyWeight"); 2248 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2249 2250 // Divide by bucket size to prevent a large size from causing rollover when 2251 // calculating amount of memory needed to be allocated for the String table. 2252 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2253 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2254 2255 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2256 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2257 2258 { 2259 // Using "else if" below to avoid printing two error messages if min > max. 2260 // This will also prevent us from reporting both min>100 and max>100 at the 2261 // same time, but that is less annoying than printing two identical errors IMHO. 2262 FormatBuffer<80> err_msg("%s",""); 2263 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2264 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2265 status = false; 2266 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2267 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2268 status = false; 2269 } 2270 } 2271 2272 // Min/MaxMetaspaceFreeRatio 2273 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2274 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2275 2276 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2277 jio_fprintf(defaultStream::error_stream(), 2278 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2279 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2280 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2281 MinMetaspaceFreeRatio, 2282 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2283 MaxMetaspaceFreeRatio); 2284 status = false; 2285 } 2286 2287 // Trying to keep 100% free is not practical 2288 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2289 2290 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2291 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2292 } 2293 2294 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2295 // Settings to encourage splitting. 2296 if (!FLAG_IS_CMDLINE(NewRatio)) { 2297 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2298 } 2299 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2300 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2301 } 2302 } 2303 2304 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2305 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2306 } 2307 2308 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2309 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2310 if (GCTimeLimit == 100) { 2311 // Turn off gc-overhead-limit-exceeded checks 2312 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2313 } 2314 2315 status = status && ArgumentsExt::check_gc_consistency_user(); 2316 status = status && check_stack_pages(); 2317 2318 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2319 "CMSIncrementalSafetyFactor"); 2320 2321 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2322 // insists that we hold the requisite locks so that the iteration is 2323 // MT-safe. For the verification at start-up and shut-down, we don't 2324 // yet have a good way of acquiring and releasing these locks, 2325 // which are not visible at the CollectedHeap level. We want to 2326 // be able to acquire these locks and then do the iteration rather 2327 // than just disable the lock verification. This will be fixed under 2328 // bug 4788986. 2329 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2330 if (VerifyDuringStartup) { 2331 warning("Heap verification at start-up disabled " 2332 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2333 VerifyDuringStartup = false; // Disable verification at start-up 2334 } 2335 2336 if (VerifyBeforeExit) { 2337 warning("Heap verification at shutdown disabled " 2338 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2339 VerifyBeforeExit = false; // Disable verification at shutdown 2340 } 2341 } 2342 2343 // Note: only executed in non-PRODUCT mode 2344 if (!UseAsyncConcMarkSweepGC && 2345 (ExplicitGCInvokesConcurrent || 2346 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2347 jio_fprintf(defaultStream::error_stream(), 2348 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2349 " with -UseAsyncConcMarkSweepGC"); 2350 status = false; 2351 } 2352 2353 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2354 2355 #if INCLUDE_ALL_GCS 2356 if (UseG1GC) { 2357 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2358 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2359 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2360 2361 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2362 "InitiatingHeapOccupancyPercent"); 2363 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2364 "G1RefProcDrainInterval"); 2365 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2366 "G1ConcMarkStepDurationMillis"); 2367 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2368 "G1ConcRSHotCardLimit"); 2369 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2370 "G1ConcRSLogCacheSize"); 2371 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2372 "StringDeduplicationAgeThreshold"); 2373 } 2374 if (UseConcMarkSweepGC) { 2375 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2376 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2377 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2378 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2379 2380 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2381 2382 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2383 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2384 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2385 2386 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2387 2388 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2389 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2390 2391 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2392 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2393 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2394 2395 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2396 2397 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2398 2399 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2400 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2401 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2402 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2403 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2404 } 2405 2406 if (UseParallelGC || UseParallelOldGC) { 2407 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2408 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2409 2410 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2411 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2412 2413 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2414 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2415 2416 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2417 2418 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2419 } 2420 #endif // INCLUDE_ALL_GCS 2421 2422 status = status && verify_interval(RefDiscoveryPolicy, 2423 ReferenceProcessor::DiscoveryPolicyMin, 2424 ReferenceProcessor::DiscoveryPolicyMax, 2425 "RefDiscoveryPolicy"); 2426 2427 // Limit the lower bound of this flag to 1 as it is used in a division 2428 // expression. 2429 status = status && verify_interval(TLABWasteTargetPercent, 2430 1, 100, "TLABWasteTargetPercent"); 2431 2432 status = status && verify_object_alignment(); 2433 2434 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2435 "CompressedClassSpaceSize"); 2436 2437 status = status && verify_interval(MarkStackSizeMax, 2438 1, (max_jint - 1), "MarkStackSizeMax"); 2439 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2440 2441 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2442 2443 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2444 2445 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2446 2447 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2448 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2449 2450 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2451 2452 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2453 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2454 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2455 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2456 2457 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2458 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2459 2460 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2461 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2462 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2463 2464 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2465 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2466 2467 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2468 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2469 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2470 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2471 2472 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2473 #ifdef COMPILER1 2474 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2475 #endif 2476 2477 if (PrintNMTStatistics) { 2478 #if INCLUDE_NMT 2479 if (MemTracker::tracking_level() == NMT_off) { 2480 #endif // INCLUDE_NMT 2481 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2482 PrintNMTStatistics = false; 2483 #if INCLUDE_NMT 2484 } 2485 #endif 2486 } 2487 2488 // Need to limit the extent of the padding to reasonable size. 2489 // 8K is well beyond the reasonable HW cache line size, even with the 2490 // aggressive prefetching, while still leaving the room for segregating 2491 // among the distinct pages. 2492 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2493 jio_fprintf(defaultStream::error_stream(), 2494 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2495 ContendedPaddingWidth, 0, 8192); 2496 status = false; 2497 } 2498 2499 // Need to enforce the padding not to break the existing field alignments. 2500 // It is sufficient to check against the largest type size. 2501 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2502 jio_fprintf(defaultStream::error_stream(), 2503 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2504 ContendedPaddingWidth, BytesPerLong); 2505 status = false; 2506 } 2507 2508 // Check lower bounds of the code cache 2509 // Template Interpreter code is approximately 3X larger in debug builds. 2510 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2511 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2512 jio_fprintf(defaultStream::error_stream(), 2513 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2514 os::vm_page_size()/K); 2515 status = false; 2516 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2517 jio_fprintf(defaultStream::error_stream(), 2518 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2519 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2520 status = false; 2521 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2522 jio_fprintf(defaultStream::error_stream(), 2523 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2524 min_code_cache_size/K); 2525 status = false; 2526 } else if (ReservedCodeCacheSize > 2*G) { 2527 // Code cache size larger than MAXINT is not supported. 2528 jio_fprintf(defaultStream::error_stream(), 2529 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2530 (2*G)/M); 2531 status = false; 2532 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2533 jio_fprintf(defaultStream::error_stream(), 2534 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2535 min_code_cache_size/K); 2536 status = false; 2537 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2538 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2539 jio_fprintf(defaultStream::error_stream(), 2540 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2541 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2542 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2543 status = false; 2544 } 2545 2546 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2547 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2548 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2549 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2550 2551 2552 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2553 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2554 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2555 // Check the minimum number of compiler threads 2556 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2557 2558 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2559 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2560 } 2561 2562 return status; 2563 } 2564 2565 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2566 const char* option_type) { 2567 if (ignore) return false; 2568 2569 const char* spacer = " "; 2570 if (option_type == NULL) { 2571 option_type = ++spacer; // Set both to the empty string. 2572 } 2573 2574 if (os::obsolete_option(option)) { 2575 jio_fprintf(defaultStream::error_stream(), 2576 "Obsolete %s%soption: %s\n", option_type, spacer, 2577 option->optionString); 2578 return false; 2579 } else { 2580 jio_fprintf(defaultStream::error_stream(), 2581 "Unrecognized %s%soption: %s\n", option_type, spacer, 2582 option->optionString); 2583 return true; 2584 } 2585 } 2586 2587 static const char* user_assertion_options[] = { 2588 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2589 }; 2590 2591 static const char* system_assertion_options[] = { 2592 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2593 }; 2594 2595 // Return true if any of the strings in null-terminated array 'names' matches. 2596 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2597 // the option must match exactly. 2598 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2599 bool tail_allowed) { 2600 for (/* empty */; *names != NULL; ++names) { 2601 if (match_option(option, *names, tail)) { 2602 if (**tail == '\0' || tail_allowed && **tail == ':') { 2603 return true; 2604 } 2605 } 2606 } 2607 return false; 2608 } 2609 2610 bool Arguments::parse_uintx(const char* value, 2611 uintx* uintx_arg, 2612 uintx min_size) { 2613 2614 // Check the sign first since atomull() parses only unsigned values. 2615 bool value_is_positive = !(*value == '-'); 2616 2617 if (value_is_positive) { 2618 julong n; 2619 bool good_return = atomull(value, &n); 2620 if (good_return) { 2621 bool above_minimum = n >= min_size; 2622 bool value_is_too_large = n > max_uintx; 2623 2624 if (above_minimum && !value_is_too_large) { 2625 *uintx_arg = n; 2626 return true; 2627 } 2628 } 2629 } 2630 return false; 2631 } 2632 2633 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2634 julong* long_arg, 2635 julong min_size) { 2636 if (!atomull(s, long_arg)) return arg_unreadable; 2637 return check_memory_size(*long_arg, min_size); 2638 } 2639 2640 // Parse JavaVMInitArgs structure 2641 2642 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2643 // For components of the system classpath. 2644 SysClassPath scp(Arguments::get_sysclasspath()); 2645 bool scp_assembly_required = false; 2646 2647 // Save default settings for some mode flags 2648 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2649 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2650 Arguments::_ClipInlining = ClipInlining; 2651 Arguments::_BackgroundCompilation = BackgroundCompilation; 2652 2653 // Setup flags for mixed which is the default 2654 set_mode_flags(_mixed); 2655 2656 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2657 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2658 if (result != JNI_OK) { 2659 return result; 2660 } 2661 2662 // Parse JavaVMInitArgs structure passed in 2663 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2664 if (result != JNI_OK) { 2665 return result; 2666 } 2667 2668 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2669 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2670 if (result != JNI_OK) { 2671 return result; 2672 } 2673 2674 // Do final processing now that all arguments have been parsed 2675 result = finalize_vm_init_args(&scp, scp_assembly_required); 2676 if (result != JNI_OK) { 2677 return result; 2678 } 2679 2680 return JNI_OK; 2681 } 2682 2683 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2684 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2685 // are dealing with -agentpath (case where name is a path), otherwise with 2686 // -agentlib 2687 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2688 char *_name; 2689 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2690 size_t _len_hprof, _len_jdwp, _len_prefix; 2691 2692 if (is_path) { 2693 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2694 return false; 2695 } 2696 2697 _name++; // skip past last path separator 2698 _len_prefix = strlen(JNI_LIB_PREFIX); 2699 2700 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2701 return false; 2702 } 2703 2704 _name += _len_prefix; 2705 _len_hprof = strlen(_hprof); 2706 _len_jdwp = strlen(_jdwp); 2707 2708 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2709 _name += _len_hprof; 2710 } 2711 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2712 _name += _len_jdwp; 2713 } 2714 else { 2715 return false; 2716 } 2717 2718 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2719 return false; 2720 } 2721 2722 return true; 2723 } 2724 2725 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2726 return true; 2727 } 2728 2729 return false; 2730 } 2731 2732 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2733 SysClassPath* scp_p, 2734 bool* scp_assembly_required_p, 2735 Flag::Flags origin) { 2736 // Remaining part of option string 2737 const char* tail; 2738 2739 // iterate over arguments 2740 for (int index = 0; index < args->nOptions; index++) { 2741 bool is_absolute_path = false; // for -agentpath vs -agentlib 2742 2743 const JavaVMOption* option = args->options + index; 2744 2745 if (!match_option(option, "-Djava.class.path", &tail) && 2746 !match_option(option, "-Dsun.java.command", &tail) && 2747 !match_option(option, "-Dsun.java.launcher", &tail)) { 2748 2749 // add all jvm options to the jvm_args string. This string 2750 // is used later to set the java.vm.args PerfData string constant. 2751 // the -Djava.class.path and the -Dsun.java.command options are 2752 // omitted from jvm_args string as each have their own PerfData 2753 // string constant object. 2754 build_jvm_args(option->optionString); 2755 } 2756 2757 // -verbose:[class/gc/jni] 2758 if (match_option(option, "-verbose", &tail)) { 2759 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2760 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2761 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2762 } else if (!strcmp(tail, ":gc")) { 2763 FLAG_SET_CMDLINE(bool, PrintGC, true); 2764 } else if (!strcmp(tail, ":jni")) { 2765 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2766 } 2767 // -da / -ea / -disableassertions / -enableassertions 2768 // These accept an optional class/package name separated by a colon, e.g., 2769 // -da:java.lang.Thread. 2770 } else if (match_option(option, user_assertion_options, &tail, true)) { 2771 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2772 if (*tail == '\0') { 2773 JavaAssertions::setUserClassDefault(enable); 2774 } else { 2775 assert(*tail == ':', "bogus match by match_option()"); 2776 JavaAssertions::addOption(tail + 1, enable); 2777 } 2778 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2779 } else if (match_option(option, system_assertion_options, &tail, false)) { 2780 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2781 JavaAssertions::setSystemClassDefault(enable); 2782 // -bootclasspath: 2783 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2784 scp_p->reset_path(tail); 2785 *scp_assembly_required_p = true; 2786 // -bootclasspath/a: 2787 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2788 scp_p->add_suffix(tail); 2789 *scp_assembly_required_p = true; 2790 // -bootclasspath/p: 2791 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2792 scp_p->add_prefix(tail); 2793 *scp_assembly_required_p = true; 2794 // -Xrun 2795 } else if (match_option(option, "-Xrun", &tail)) { 2796 if (tail != NULL) { 2797 const char* pos = strchr(tail, ':'); 2798 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2799 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2800 name[len] = '\0'; 2801 2802 char *options = NULL; 2803 if(pos != NULL) { 2804 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2805 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2806 } 2807 #if !INCLUDE_JVMTI 2808 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2809 jio_fprintf(defaultStream::error_stream(), 2810 "Profiling and debugging agents are not supported in this VM\n"); 2811 return JNI_ERR; 2812 } 2813 #endif // !INCLUDE_JVMTI 2814 add_init_library(name, options); 2815 } 2816 // -agentlib and -agentpath 2817 } else if (match_option(option, "-agentlib:", &tail) || 2818 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2819 if(tail != NULL) { 2820 const char* pos = strchr(tail, '='); 2821 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2822 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2823 name[len] = '\0'; 2824 2825 char *options = NULL; 2826 if(pos != NULL) { 2827 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2828 } 2829 #if !INCLUDE_JVMTI 2830 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2831 jio_fprintf(defaultStream::error_stream(), 2832 "Profiling and debugging agents are not supported in this VM\n"); 2833 return JNI_ERR; 2834 } 2835 #endif // !INCLUDE_JVMTI 2836 add_init_agent(name, options, is_absolute_path); 2837 } 2838 // -javaagent 2839 } else if (match_option(option, "-javaagent:", &tail)) { 2840 #if !INCLUDE_JVMTI 2841 jio_fprintf(defaultStream::error_stream(), 2842 "Instrumentation agents are not supported in this VM\n"); 2843 return JNI_ERR; 2844 #else 2845 if(tail != NULL) { 2846 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2847 add_init_agent("instrument", options, false); 2848 } 2849 #endif // !INCLUDE_JVMTI 2850 // -Xnoclassgc 2851 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2852 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2853 // -Xconcgc 2854 } else if (match_option(option, "-Xconcgc", &tail)) { 2855 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2856 // -Xnoconcgc 2857 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2858 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2859 // -Xbatch 2860 } else if (match_option(option, "-Xbatch", &tail)) { 2861 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2862 // -Xmn for compatibility with other JVM vendors 2863 } else if (match_option(option, "-Xmn", &tail)) { 2864 julong long_initial_young_size = 0; 2865 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2866 if (errcode != arg_in_range) { 2867 jio_fprintf(defaultStream::error_stream(), 2868 "Invalid initial young generation size: %s\n", option->optionString); 2869 describe_range_error(errcode); 2870 return JNI_EINVAL; 2871 } 2872 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2873 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2874 // -Xms 2875 } else if (match_option(option, "-Xms", &tail)) { 2876 julong long_initial_heap_size = 0; 2877 // an initial heap size of 0 means automatically determine 2878 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2879 if (errcode != arg_in_range) { 2880 jio_fprintf(defaultStream::error_stream(), 2881 "Invalid initial heap size: %s\n", option->optionString); 2882 describe_range_error(errcode); 2883 return JNI_EINVAL; 2884 } 2885 set_min_heap_size((uintx)long_initial_heap_size); 2886 // Currently the minimum size and the initial heap sizes are the same. 2887 // Can be overridden with -XX:InitialHeapSize. 2888 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2889 // -Xmx 2890 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2891 julong long_max_heap_size = 0; 2892 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2893 if (errcode != arg_in_range) { 2894 jio_fprintf(defaultStream::error_stream(), 2895 "Invalid maximum heap size: %s\n", option->optionString); 2896 describe_range_error(errcode); 2897 return JNI_EINVAL; 2898 } 2899 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2900 // Xmaxf 2901 } else if (match_option(option, "-Xmaxf", &tail)) { 2902 char* err; 2903 int maxf = (int)(strtod(tail, &err) * 100); 2904 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2905 jio_fprintf(defaultStream::error_stream(), 2906 "Bad max heap free percentage size: %s\n", 2907 option->optionString); 2908 return JNI_EINVAL; 2909 } else { 2910 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2911 } 2912 // Xminf 2913 } else if (match_option(option, "-Xminf", &tail)) { 2914 char* err; 2915 int minf = (int)(strtod(tail, &err) * 100); 2916 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2917 jio_fprintf(defaultStream::error_stream(), 2918 "Bad min heap free percentage size: %s\n", 2919 option->optionString); 2920 return JNI_EINVAL; 2921 } else { 2922 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2923 } 2924 // -Xss 2925 } else if (match_option(option, "-Xss", &tail)) { 2926 julong long_ThreadStackSize = 0; 2927 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2928 if (errcode != arg_in_range) { 2929 jio_fprintf(defaultStream::error_stream(), 2930 "Invalid thread stack size: %s\n", option->optionString); 2931 describe_range_error(errcode); 2932 return JNI_EINVAL; 2933 } 2934 // Internally track ThreadStackSize in units of 1024 bytes. 2935 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2936 round_to((int)long_ThreadStackSize, K) / K); 2937 // -Xoss 2938 } else if (match_option(option, "-Xoss", &tail)) { 2939 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2940 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2941 julong long_CodeCacheExpansionSize = 0; 2942 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2943 if (errcode != arg_in_range) { 2944 jio_fprintf(defaultStream::error_stream(), 2945 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2946 os::vm_page_size()/K); 2947 return JNI_EINVAL; 2948 } 2949 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2950 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2951 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2952 julong long_ReservedCodeCacheSize = 0; 2953 2954 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2955 if (errcode != arg_in_range) { 2956 jio_fprintf(defaultStream::error_stream(), 2957 "Invalid maximum code cache size: %s.\n", option->optionString); 2958 return JNI_EINVAL; 2959 } 2960 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2961 // -XX:NonNMethodCodeHeapSize= 2962 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2963 julong long_NonNMethodCodeHeapSize = 0; 2964 2965 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2966 if (errcode != arg_in_range) { 2967 jio_fprintf(defaultStream::error_stream(), 2968 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2969 return JNI_EINVAL; 2970 } 2971 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2972 // -XX:ProfiledCodeHeapSize= 2973 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2974 julong long_ProfiledCodeHeapSize = 0; 2975 2976 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2977 if (errcode != arg_in_range) { 2978 jio_fprintf(defaultStream::error_stream(), 2979 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2980 return JNI_EINVAL; 2981 } 2982 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2983 // -XX:NonProfiledCodeHeapSizee= 2984 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2985 julong long_NonProfiledCodeHeapSize = 0; 2986 2987 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2988 if (errcode != arg_in_range) { 2989 jio_fprintf(defaultStream::error_stream(), 2990 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2991 return JNI_EINVAL; 2992 } 2993 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2994 //-XX:IncreaseFirstTierCompileThresholdAt= 2995 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2996 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2997 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2998 jio_fprintf(defaultStream::error_stream(), 2999 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 3000 option->optionString); 3001 return JNI_EINVAL; 3002 } 3003 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 3004 // -green 3005 } else if (match_option(option, "-green", &tail)) { 3006 jio_fprintf(defaultStream::error_stream(), 3007 "Green threads support not available\n"); 3008 return JNI_EINVAL; 3009 // -native 3010 } else if (match_option(option, "-native", &tail)) { 3011 // HotSpot always uses native threads, ignore silently for compatibility 3012 // -Xsqnopause 3013 } else if (match_option(option, "-Xsqnopause", &tail)) { 3014 // EVM option, ignore silently for compatibility 3015 // -Xrs 3016 } else if (match_option(option, "-Xrs", &tail)) { 3017 // Classic/EVM option, new functionality 3018 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 3019 } else if (match_option(option, "-Xusealtsigs", &tail)) { 3020 // change default internal VM signals used - lower case for back compat 3021 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 3022 // -Xoptimize 3023 } else if (match_option(option, "-Xoptimize", &tail)) { 3024 // EVM option, ignore silently for compatibility 3025 // -Xprof 3026 } else if (match_option(option, "-Xprof", &tail)) { 3027 #if INCLUDE_FPROF 3028 _has_profile = true; 3029 #else // INCLUDE_FPROF 3030 jio_fprintf(defaultStream::error_stream(), 3031 "Flat profiling is not supported in this VM.\n"); 3032 return JNI_ERR; 3033 #endif // INCLUDE_FPROF 3034 // -Xconcurrentio 3035 } else if (match_option(option, "-Xconcurrentio", &tail)) { 3036 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 3037 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 3038 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 3039 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3040 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 3041 3042 // -Xinternalversion 3043 } else if (match_option(option, "-Xinternalversion", &tail)) { 3044 jio_fprintf(defaultStream::output_stream(), "%s\n", 3045 VM_Version::internal_vm_info_string()); 3046 vm_exit(0); 3047 #ifndef PRODUCT 3048 // -Xprintflags 3049 } else if (match_option(option, "-Xprintflags", &tail)) { 3050 CommandLineFlags::printFlags(tty, false); 3051 vm_exit(0); 3052 #endif 3053 // -D 3054 } else if (match_option(option, "-D", &tail)) { 3055 if (!add_property(tail)) { 3056 return JNI_ENOMEM; 3057 } 3058 // Out of the box management support 3059 if (match_option(option, "-Dcom.sun.management", &tail)) { 3060 #if INCLUDE_MANAGEMENT 3061 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3062 #else 3063 jio_fprintf(defaultStream::output_stream(), 3064 "-Dcom.sun.management is not supported in this VM.\n"); 3065 return JNI_ERR; 3066 #endif 3067 } 3068 // -Xint 3069 } else if (match_option(option, "-Xint", &tail)) { 3070 set_mode_flags(_int); 3071 // -Xmixed 3072 } else if (match_option(option, "-Xmixed", &tail)) { 3073 set_mode_flags(_mixed); 3074 // -Xcomp 3075 } else if (match_option(option, "-Xcomp", &tail)) { 3076 // for testing the compiler; turn off all flags that inhibit compilation 3077 set_mode_flags(_comp); 3078 // -Xshare:dump 3079 } else if (match_option(option, "-Xshare:dump", &tail)) { 3080 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3081 set_mode_flags(_int); // Prevent compilation, which creates objects 3082 // -Xshare:on 3083 } else if (match_option(option, "-Xshare:on", &tail)) { 3084 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3085 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3086 // -Xshare:auto 3087 } else if (match_option(option, "-Xshare:auto", &tail)) { 3088 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3089 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3090 // -Xshare:off 3091 } else if (match_option(option, "-Xshare:off", &tail)) { 3092 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3093 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3094 // -Xverify 3095 } else if (match_option(option, "-Xverify", &tail)) { 3096 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3097 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3098 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3099 } else if (strcmp(tail, ":remote") == 0) { 3100 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3101 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3102 } else if (strcmp(tail, ":none") == 0) { 3103 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3104 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3105 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3106 return JNI_EINVAL; 3107 } 3108 // -Xdebug 3109 } else if (match_option(option, "-Xdebug", &tail)) { 3110 // note this flag has been used, then ignore 3111 set_xdebug_mode(true); 3112 // -Xnoagent 3113 } else if (match_option(option, "-Xnoagent", &tail)) { 3114 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3115 } else if (match_option(option, "-Xboundthreads", &tail)) { 3116 // Bind user level threads to kernel threads (Solaris only) 3117 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3118 } else if (match_option(option, "-Xloggc:", &tail)) { 3119 // Redirect GC output to the file. -Xloggc:<filename> 3120 // ostream_init_log(), when called will use this filename 3121 // to initialize a fileStream. 3122 _gc_log_filename = os::strdup_check_oom(tail); 3123 if (!is_filename_valid(_gc_log_filename)) { 3124 jio_fprintf(defaultStream::output_stream(), 3125 "Invalid file name for use with -Xloggc: Filename can only contain the " 3126 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3127 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3128 return JNI_EINVAL; 3129 } 3130 FLAG_SET_CMDLINE(bool, PrintGC, true); 3131 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3132 3133 // JNI hooks 3134 } else if (match_option(option, "-Xcheck", &tail)) { 3135 if (!strcmp(tail, ":jni")) { 3136 #if !INCLUDE_JNI_CHECK 3137 warning("JNI CHECKING is not supported in this VM"); 3138 #else 3139 CheckJNICalls = true; 3140 #endif // INCLUDE_JNI_CHECK 3141 } else if (is_bad_option(option, args->ignoreUnrecognized, 3142 "check")) { 3143 return JNI_EINVAL; 3144 } 3145 } else if (match_option(option, "vfprintf", &tail)) { 3146 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3147 } else if (match_option(option, "exit", &tail)) { 3148 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3149 } else if (match_option(option, "abort", &tail)) { 3150 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3151 // -XX:+AggressiveHeap 3152 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 3153 3154 // This option inspects the machine and attempts to set various 3155 // parameters to be optimal for long-running, memory allocation 3156 // intensive jobs. It is intended for machines with large 3157 // amounts of cpu and memory. 3158 3159 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3160 // VM, but we may not be able to represent the total physical memory 3161 // available (like having 8gb of memory on a box but using a 32bit VM). 3162 // Thus, we need to make sure we're using a julong for intermediate 3163 // calculations. 3164 julong initHeapSize; 3165 julong total_memory = os::physical_memory(); 3166 3167 if (total_memory < (julong)256*M) { 3168 jio_fprintf(defaultStream::error_stream(), 3169 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3170 vm_exit(1); 3171 } 3172 3173 // The heap size is half of available memory, or (at most) 3174 // all of possible memory less 160mb (leaving room for the OS 3175 // when using ISM). This is the maximum; because adaptive sizing 3176 // is turned on below, the actual space used may be smaller. 3177 3178 initHeapSize = MIN2(total_memory / (julong)2, 3179 total_memory - (julong)160*M); 3180 3181 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3182 3183 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3184 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3185 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3186 // Currently the minimum size and the initial heap sizes are the same. 3187 set_min_heap_size(initHeapSize); 3188 } 3189 if (FLAG_IS_DEFAULT(NewSize)) { 3190 // Make the young generation 3/8ths of the total heap. 3191 FLAG_SET_CMDLINE(uintx, NewSize, 3192 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3193 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3194 } 3195 3196 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3197 FLAG_SET_DEFAULT(UseLargePages, true); 3198 #endif 3199 3200 // Increase some data structure sizes for efficiency 3201 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3202 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3203 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3204 3205 // See the OldPLABSize comment below, but replace 'after promotion' 3206 // with 'after copying'. YoungPLABSize is the size of the survivor 3207 // space per-gc-thread buffers. The default is 4kw. 3208 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3209 3210 // OldPLABSize is the size of the buffers in the old gen that 3211 // UseParallelGC uses to promote live data that doesn't fit in the 3212 // survivor spaces. At any given time, there's one for each gc thread. 3213 // The default size is 1kw. These buffers are rarely used, since the 3214 // survivor spaces are usually big enough. For specjbb, however, there 3215 // are occasions when there's lots of live data in the young gen 3216 // and we end up promoting some of it. We don't have a definite 3217 // explanation for why bumping OldPLABSize helps, but the theory 3218 // is that a bigger PLAB results in retaining something like the 3219 // original allocation order after promotion, which improves mutator 3220 // locality. A minor effect may be that larger PLABs reduce the 3221 // number of PLAB allocation events during gc. The value of 8kw 3222 // was arrived at by experimenting with specjbb. 3223 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3224 3225 // Enable parallel GC and adaptive generation sizing 3226 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3227 FLAG_SET_DEFAULT(ParallelGCThreads, 3228 Abstract_VM_Version::parallel_worker_threads()); 3229 3230 // Encourage steady state memory management 3231 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3232 3233 // This appears to improve mutator locality 3234 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3235 3236 // Get around early Solaris scheduling bug 3237 // (affinity vs other jobs on system) 3238 // but disallow DR and offlining (5008695). 3239 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3240 3241 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3242 // and the last option wins. 3243 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3244 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3245 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3246 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3247 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3248 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3249 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3250 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3251 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3252 uintx max_tenuring_thresh = 0; 3253 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3254 jio_fprintf(defaultStream::error_stream(), 3255 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3256 } 3257 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3258 3259 if (MaxTenuringThreshold == 0) { 3260 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3261 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3262 } else { 3263 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3264 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3265 } 3266 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3267 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3268 jio_fprintf(defaultStream::error_stream(), 3269 "Please use CMSClassUnloadingEnabled in place of " 3270 "CMSPermGenSweepingEnabled in the future\n"); 3271 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3272 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3273 jio_fprintf(defaultStream::error_stream(), 3274 "Please use -XX:+UseGCOverheadLimit in place of " 3275 "-XX:+UseGCTimeLimit in the future\n"); 3276 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3277 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3278 jio_fprintf(defaultStream::error_stream(), 3279 "Please use -XX:-UseGCOverheadLimit in place of " 3280 "-XX:-UseGCTimeLimit in the future\n"); 3281 // The TLE options are for compatibility with 1.3 and will be 3282 // removed without notice in a future release. These options 3283 // are not to be documented. 3284 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3285 // No longer used. 3286 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3287 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3288 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3289 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3290 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3291 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3292 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3293 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3294 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3295 // No longer used. 3296 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3297 julong long_tlab_size = 0; 3298 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3299 if (errcode != arg_in_range) { 3300 jio_fprintf(defaultStream::error_stream(), 3301 "Invalid TLAB size: %s\n", option->optionString); 3302 describe_range_error(errcode); 3303 return JNI_EINVAL; 3304 } 3305 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3306 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3307 // No longer used. 3308 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3309 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3310 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3311 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3312 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3313 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3314 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3315 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3316 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3317 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3318 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3319 #if defined(DTRACE_ENABLED) 3320 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3321 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3322 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3323 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3324 #else // defined(DTRACE_ENABLED) 3325 jio_fprintf(defaultStream::error_stream(), 3326 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3327 return JNI_EINVAL; 3328 #endif // defined(DTRACE_ENABLED) 3329 #ifdef ASSERT 3330 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3331 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3332 // disable scavenge before parallel mark-compact 3333 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3334 #endif 3335 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3336 julong cms_blocks_to_claim = (julong)atol(tail); 3337 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3338 jio_fprintf(defaultStream::error_stream(), 3339 "Please use -XX:OldPLABSize in place of " 3340 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3341 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3342 julong cms_blocks_to_claim = (julong)atol(tail); 3343 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3344 jio_fprintf(defaultStream::error_stream(), 3345 "Please use -XX:OldPLABSize in place of " 3346 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3347 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3348 julong old_plab_size = 0; 3349 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3350 if (errcode != arg_in_range) { 3351 jio_fprintf(defaultStream::error_stream(), 3352 "Invalid old PLAB size: %s\n", option->optionString); 3353 describe_range_error(errcode); 3354 return JNI_EINVAL; 3355 } 3356 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3357 jio_fprintf(defaultStream::error_stream(), 3358 "Please use -XX:OldPLABSize in place of " 3359 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3360 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3361 julong young_plab_size = 0; 3362 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3363 if (errcode != arg_in_range) { 3364 jio_fprintf(defaultStream::error_stream(), 3365 "Invalid young PLAB size: %s\n", option->optionString); 3366 describe_range_error(errcode); 3367 return JNI_EINVAL; 3368 } 3369 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3370 jio_fprintf(defaultStream::error_stream(), 3371 "Please use -XX:YoungPLABSize in place of " 3372 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3373 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3374 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3375 julong stack_size = 0; 3376 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3377 if (errcode != arg_in_range) { 3378 jio_fprintf(defaultStream::error_stream(), 3379 "Invalid mark stack size: %s\n", option->optionString); 3380 describe_range_error(errcode); 3381 return JNI_EINVAL; 3382 } 3383 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3384 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3385 julong max_stack_size = 0; 3386 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3387 if (errcode != arg_in_range) { 3388 jio_fprintf(defaultStream::error_stream(), 3389 "Invalid maximum mark stack size: %s\n", 3390 option->optionString); 3391 describe_range_error(errcode); 3392 return JNI_EINVAL; 3393 } 3394 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3395 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3396 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3397 uintx conc_threads = 0; 3398 if (!parse_uintx(tail, &conc_threads, 1)) { 3399 jio_fprintf(defaultStream::error_stream(), 3400 "Invalid concurrent threads: %s\n", option->optionString); 3401 return JNI_EINVAL; 3402 } 3403 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3404 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3405 julong max_direct_memory_size = 0; 3406 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3407 if (errcode != arg_in_range) { 3408 jio_fprintf(defaultStream::error_stream(), 3409 "Invalid maximum direct memory size: %s\n", 3410 option->optionString); 3411 describe_range_error(errcode); 3412 return JNI_EINVAL; 3413 } 3414 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3415 #if !INCLUDE_MANAGEMENT 3416 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3417 jio_fprintf(defaultStream::error_stream(), 3418 "ManagementServer is not supported in this VM.\n"); 3419 return JNI_ERR; 3420 #endif // INCLUDE_MANAGEMENT 3421 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3422 // Skip -XX:Flags= since that case has already been handled 3423 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3424 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3425 return JNI_EINVAL; 3426 } 3427 } 3428 // Unknown option 3429 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3430 return JNI_ERR; 3431 } 3432 } 3433 3434 // PrintSharedArchiveAndExit will turn on 3435 // -Xshare:on 3436 // -XX:+TraceClassPaths 3437 if (PrintSharedArchiveAndExit) { 3438 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3439 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3440 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3441 } 3442 3443 // Change the default value for flags which have different default values 3444 // when working with older JDKs. 3445 #ifdef LINUX 3446 if (JDK_Version::current().compare_major(6) <= 0 && 3447 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3448 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3449 } 3450 #endif // LINUX 3451 fix_appclasspath(); 3452 return JNI_OK; 3453 } 3454 3455 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3456 // 3457 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3458 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3459 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3460 // path is treated as the current directory. 3461 // 3462 // This causes problems with CDS, which requires that all directories specified in the classpath 3463 // must be empty. In most cases, applications do NOT want to load classes from the current 3464 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3465 // scripts compatible with CDS. 3466 void Arguments::fix_appclasspath() { 3467 if (IgnoreEmptyClassPaths) { 3468 const char separator = *os::path_separator(); 3469 const char* src = _java_class_path->value(); 3470 3471 // skip over all the leading empty paths 3472 while (*src == separator) { 3473 src ++; 3474 } 3475 3476 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3477 strncpy(copy, src, strlen(src) + 1); 3478 3479 // trim all trailing empty paths 3480 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3481 *tail = '\0'; 3482 } 3483 3484 char from[3] = {separator, separator, '\0'}; 3485 char to [2] = {separator, '\0'}; 3486 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3487 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3488 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3489 } 3490 3491 _java_class_path->set_value(copy); 3492 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3493 } 3494 3495 if (!PrintSharedArchiveAndExit) { 3496 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3497 } 3498 } 3499 3500 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3501 // This must be done after all -D arguments have been processed. 3502 scp_p->expand_endorsed(); 3503 3504 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3505 // Assemble the bootclasspath elements into the final path. 3506 Arguments::set_sysclasspath(scp_p->combined_path()); 3507 } 3508 3509 // This must be done after all arguments have been processed. 3510 // java_compiler() true means set to "NONE" or empty. 3511 if (java_compiler() && !xdebug_mode()) { 3512 // For backwards compatibility, we switch to interpreted mode if 3513 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3514 // not specified. 3515 set_mode_flags(_int); 3516 } 3517 3518 if ((TieredCompilation && CompileThresholdScaling == 0) 3519 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) { 3520 set_mode_flags(_int); 3521 } 3522 3523 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3524 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3525 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3526 } 3527 3528 #ifndef COMPILER2 3529 // Don't degrade server performance for footprint 3530 if (FLAG_IS_DEFAULT(UseLargePages) && 3531 MaxHeapSize < LargePageHeapSizeThreshold) { 3532 // No need for large granularity pages w/small heaps. 3533 // Note that large pages are enabled/disabled for both the 3534 // Java heap and the code cache. 3535 FLAG_SET_DEFAULT(UseLargePages, false); 3536 } 3537 3538 #else 3539 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3540 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3541 } 3542 #endif 3543 3544 #ifndef TIERED 3545 // Tiered compilation is undefined. 3546 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3547 #endif 3548 3549 // If we are running in a headless jre, force java.awt.headless property 3550 // to be true unless the property has already been set. 3551 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3552 if (os::is_headless_jre()) { 3553 const char* headless = Arguments::get_property("java.awt.headless"); 3554 if (headless == NULL) { 3555 char envbuffer[128]; 3556 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3557 if (!add_property("java.awt.headless=true")) { 3558 return JNI_ENOMEM; 3559 } 3560 } else { 3561 char buffer[256]; 3562 strcpy(buffer, "java.awt.headless="); 3563 strcat(buffer, envbuffer); 3564 if (!add_property(buffer)) { 3565 return JNI_ENOMEM; 3566 } 3567 } 3568 } 3569 } 3570 3571 if (!ArgumentsExt::check_vm_args_consistency()) { 3572 return JNI_ERR; 3573 } 3574 3575 return JNI_OK; 3576 } 3577 3578 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3579 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3580 scp_assembly_required_p); 3581 } 3582 3583 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3584 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3585 scp_assembly_required_p); 3586 } 3587 3588 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3589 const int N_MAX_OPTIONS = 64; 3590 const int OPTION_BUFFER_SIZE = 1024; 3591 char buffer[OPTION_BUFFER_SIZE]; 3592 3593 // The variable will be ignored if it exceeds the length of the buffer. 3594 // Don't check this variable if user has special privileges 3595 // (e.g. unix su command). 3596 if (os::getenv(name, buffer, sizeof(buffer)) && 3597 !os::have_special_privileges()) { 3598 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3599 jio_fprintf(defaultStream::error_stream(), 3600 "Picked up %s: %s\n", name, buffer); 3601 char* rd = buffer; // pointer to the input string (rd) 3602 int i; 3603 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3604 while (isspace(*rd)) rd++; // skip whitespace 3605 if (*rd == 0) break; // we re done when the input string is read completely 3606 3607 // The output, option string, overwrites the input string. 3608 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3609 // input string (rd). 3610 char* wrt = rd; 3611 3612 options[i++].optionString = wrt; // Fill in option 3613 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3614 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3615 int quote = *rd; // matching quote to look for 3616 rd++; // don't copy open quote 3617 while (*rd != quote) { // include everything (even spaces) up until quote 3618 if (*rd == 0) { // string termination means unmatched string 3619 jio_fprintf(defaultStream::error_stream(), 3620 "Unmatched quote in %s\n", name); 3621 return JNI_ERR; 3622 } 3623 *wrt++ = *rd++; // copy to option string 3624 } 3625 rd++; // don't copy close quote 3626 } else { 3627 *wrt++ = *rd++; // copy to option string 3628 } 3629 } 3630 // Need to check if we're done before writing a NULL, 3631 // because the write could be to the byte that rd is pointing to. 3632 if (*rd++ == 0) { 3633 *wrt = 0; 3634 break; 3635 } 3636 *wrt = 0; // Zero terminate option 3637 } 3638 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3639 JavaVMInitArgs vm_args; 3640 vm_args.version = JNI_VERSION_1_2; 3641 vm_args.options = options; 3642 vm_args.nOptions = i; 3643 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3644 3645 if (PrintVMOptions) { 3646 const char* tail; 3647 for (int i = 0; i < vm_args.nOptions; i++) { 3648 const JavaVMOption *option = vm_args.options + i; 3649 if (match_option(option, "-XX:", &tail)) { 3650 logOption(tail); 3651 } 3652 } 3653 } 3654 3655 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3656 } 3657 return JNI_OK; 3658 } 3659 3660 void Arguments::set_shared_spaces_flags() { 3661 if (DumpSharedSpaces) { 3662 if (RequireSharedSpaces) { 3663 warning("cannot dump shared archive while using shared archive"); 3664 } 3665 UseSharedSpaces = false; 3666 #ifdef _LP64 3667 if (!UseCompressedOops || !UseCompressedClassPointers) { 3668 vm_exit_during_initialization( 3669 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3670 } 3671 } else { 3672 if (!UseCompressedOops || !UseCompressedClassPointers) { 3673 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3674 } 3675 #endif 3676 } 3677 } 3678 3679 #if !INCLUDE_ALL_GCS 3680 static void force_serial_gc() { 3681 FLAG_SET_DEFAULT(UseSerialGC, true); 3682 UNSUPPORTED_GC_OPTION(UseG1GC); 3683 UNSUPPORTED_GC_OPTION(UseParallelGC); 3684 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3685 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3686 UNSUPPORTED_GC_OPTION(UseParNewGC); 3687 } 3688 #endif // INCLUDE_ALL_GCS 3689 3690 // Sharing support 3691 // Construct the path to the archive 3692 static char* get_shared_archive_path() { 3693 char *shared_archive_path; 3694 if (SharedArchiveFile == NULL) { 3695 char jvm_path[JVM_MAXPATHLEN]; 3696 os::jvm_path(jvm_path, sizeof(jvm_path)); 3697 char *end = strrchr(jvm_path, *os::file_separator()); 3698 if (end != NULL) *end = '\0'; 3699 size_t jvm_path_len = strlen(jvm_path); 3700 size_t file_sep_len = strlen(os::file_separator()); 3701 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3702 file_sep_len + 20, mtInternal); 3703 if (shared_archive_path != NULL) { 3704 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3705 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3706 strncat(shared_archive_path, "classes.jsa", 11); 3707 } 3708 } else { 3709 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3710 if (shared_archive_path != NULL) { 3711 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3712 } 3713 } 3714 return shared_archive_path; 3715 } 3716 3717 #ifndef PRODUCT 3718 // Determine whether LogVMOutput should be implicitly turned on. 3719 static bool use_vm_log() { 3720 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3721 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3722 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3723 PrintAssembly || TraceDeoptimization || TraceDependencies || 3724 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3725 return true; 3726 } 3727 3728 #ifdef COMPILER1 3729 if (PrintC1Statistics) { 3730 return true; 3731 } 3732 #endif // COMPILER1 3733 3734 #ifdef COMPILER2 3735 if (PrintOptoAssembly || PrintOptoStatistics) { 3736 return true; 3737 } 3738 #endif // COMPILER2 3739 3740 return false; 3741 } 3742 #endif // PRODUCT 3743 3744 // Parse entry point called from JNI_CreateJavaVM 3745 3746 jint Arguments::parse(const JavaVMInitArgs* args) { 3747 3748 // Remaining part of option string 3749 const char* tail; 3750 3751 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3752 const char* hotspotrc = ".hotspotrc"; 3753 bool settings_file_specified = false; 3754 bool needs_hotspotrc_warning = false; 3755 3756 const char* flags_file; 3757 int index; 3758 for (index = 0; index < args->nOptions; index++) { 3759 const JavaVMOption *option = args->options + index; 3760 if (ArgumentsExt::process_options(option)) { 3761 continue; 3762 } 3763 if (match_option(option, "-XX:Flags=", &tail)) { 3764 flags_file = tail; 3765 settings_file_specified = true; 3766 continue; 3767 } 3768 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3769 PrintVMOptions = true; 3770 continue; 3771 } 3772 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3773 PrintVMOptions = false; 3774 continue; 3775 } 3776 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3777 IgnoreUnrecognizedVMOptions = true; 3778 continue; 3779 } 3780 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3781 IgnoreUnrecognizedVMOptions = false; 3782 continue; 3783 } 3784 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3785 CommandLineFlags::printFlags(tty, false); 3786 vm_exit(0); 3787 } 3788 #if INCLUDE_NMT 3789 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3790 // The launcher did not setup nmt environment variable properly. 3791 if (!MemTracker::check_launcher_nmt_support(tail)) { 3792 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3793 } 3794 3795 // Verify if nmt option is valid. 3796 if (MemTracker::verify_nmt_option()) { 3797 // Late initialization, still in single-threaded mode. 3798 if (MemTracker::tracking_level() >= NMT_summary) { 3799 MemTracker::init(); 3800 } 3801 } else { 3802 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3803 } 3804 continue; 3805 } 3806 #endif 3807 3808 3809 #ifndef PRODUCT 3810 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3811 CommandLineFlags::printFlags(tty, true); 3812 vm_exit(0); 3813 } 3814 #endif 3815 } 3816 3817 if (IgnoreUnrecognizedVMOptions) { 3818 // uncast const to modify the flag args->ignoreUnrecognized 3819 *(jboolean*)(&args->ignoreUnrecognized) = true; 3820 } 3821 3822 // Parse specified settings file 3823 if (settings_file_specified) { 3824 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3825 return JNI_EINVAL; 3826 } 3827 } else { 3828 #ifdef ASSERT 3829 // Parse default .hotspotrc settings file 3830 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3831 return JNI_EINVAL; 3832 } 3833 #else 3834 struct stat buf; 3835 if (os::stat(hotspotrc, &buf) == 0) { 3836 needs_hotspotrc_warning = true; 3837 } 3838 #endif 3839 } 3840 3841 if (PrintVMOptions) { 3842 for (index = 0; index < args->nOptions; index++) { 3843 const JavaVMOption *option = args->options + index; 3844 if (match_option(option, "-XX:", &tail)) { 3845 logOption(tail); 3846 } 3847 } 3848 } 3849 3850 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3851 jint result = parse_vm_init_args(args); 3852 if (result != JNI_OK) { 3853 return result; 3854 } 3855 3856 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3857 SharedArchivePath = get_shared_archive_path(); 3858 if (SharedArchivePath == NULL) { 3859 return JNI_ENOMEM; 3860 } 3861 3862 // Set up VerifySharedSpaces 3863 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3864 VerifySharedSpaces = true; 3865 } 3866 3867 // Delay warning until here so that we've had a chance to process 3868 // the -XX:-PrintWarnings flag 3869 if (needs_hotspotrc_warning) { 3870 warning("%s file is present but has been ignored. " 3871 "Run with -XX:Flags=%s to load the file.", 3872 hotspotrc, hotspotrc); 3873 } 3874 3875 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3876 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3877 #endif 3878 3879 #if INCLUDE_ALL_GCS 3880 #if (defined JAVASE_EMBEDDED || defined ARM) 3881 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3882 #endif 3883 #endif 3884 3885 #ifndef PRODUCT 3886 if (TraceBytecodesAt != 0) { 3887 TraceBytecodes = true; 3888 } 3889 if (CountCompiledCalls) { 3890 if (UseCounterDecay) { 3891 warning("UseCounterDecay disabled because CountCalls is set"); 3892 UseCounterDecay = false; 3893 } 3894 } 3895 #endif // PRODUCT 3896 3897 if (ScavengeRootsInCode == 0) { 3898 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3899 warning("forcing ScavengeRootsInCode non-zero"); 3900 } 3901 ScavengeRootsInCode = 1; 3902 } 3903 3904 if (PrintGCDetails) { 3905 // Turn on -verbose:gc options as well 3906 PrintGC = true; 3907 } 3908 3909 // Set object alignment values. 3910 set_object_alignment(); 3911 3912 #if !INCLUDE_ALL_GCS 3913 force_serial_gc(); 3914 #endif // INCLUDE_ALL_GCS 3915 #if !INCLUDE_CDS 3916 if (DumpSharedSpaces || RequireSharedSpaces) { 3917 jio_fprintf(defaultStream::error_stream(), 3918 "Shared spaces are not supported in this VM\n"); 3919 return JNI_ERR; 3920 } 3921 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3922 warning("Shared spaces are not supported in this VM"); 3923 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3924 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3925 } 3926 no_shared_spaces("CDS Disabled"); 3927 #endif // INCLUDE_CDS 3928 3929 return JNI_OK; 3930 } 3931 3932 jint Arguments::apply_ergo() { 3933 3934 // Set flags based on ergonomics. 3935 set_ergonomics_flags(); 3936 3937 set_shared_spaces_flags(); 3938 3939 // Check the GC selections again. 3940 if (!ArgumentsExt::check_gc_consistency_ergo()) { 3941 return JNI_EINVAL; 3942 } 3943 3944 if (TieredCompilation) { 3945 set_tiered_flags(); 3946 } else { 3947 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3948 if (CompilationPolicyChoice >= 2) { 3949 vm_exit_during_initialization( 3950 "Incompatible compilation policy selected", NULL); 3951 } 3952 // Scale CompileThreshold 3953 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { 3954 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold)); 3955 } 3956 } 3957 3958 #ifdef COMPILER2 3959 #ifndef PRODUCT 3960 if (PrintIdealGraphLevel > 0) { 3961 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3962 } 3963 #endif 3964 #endif 3965 3966 // Set heap size based on available physical memory 3967 set_heap_size(); 3968 3969 set_gc_specific_flags(); 3970 3971 // Initialize Metaspace flags and alignments 3972 Metaspace::ergo_initialize(); 3973 3974 // Set bytecode rewriting flags 3975 set_bytecode_flags(); 3976 3977 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3978 set_aggressive_opts_flags(); 3979 3980 // Turn off biased locking for locking debug mode flags, 3981 // which are subtly different from each other but neither works with 3982 // biased locking 3983 if (UseHeavyMonitors 3984 #ifdef COMPILER1 3985 || !UseFastLocking 3986 #endif // COMPILER1 3987 ) { 3988 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3989 // flag set to true on command line; warn the user that they 3990 // can't enable biased locking here 3991 warning("Biased Locking is not supported with locking debug flags" 3992 "; ignoring UseBiasedLocking flag." ); 3993 } 3994 UseBiasedLocking = false; 3995 } 3996 3997 #ifdef ZERO 3998 // Clear flags not supported on zero. 3999 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4000 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4001 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4002 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4003 #endif // CC_INTERP 4004 4005 #ifdef COMPILER2 4006 if (!EliminateLocks) { 4007 EliminateNestedLocks = false; 4008 } 4009 if (!Inline) { 4010 IncrementalInline = false; 4011 } 4012 #ifndef PRODUCT 4013 if (!IncrementalInline) { 4014 AlwaysIncrementalInline = false; 4015 } 4016 #endif 4017 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4018 // nothing to use the profiling, turn if off 4019 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4020 } 4021 #endif 4022 4023 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4024 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4025 DebugNonSafepoints = true; 4026 } 4027 4028 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4029 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4030 } 4031 4032 #ifndef PRODUCT 4033 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4034 if (use_vm_log()) { 4035 LogVMOutput = true; 4036 } 4037 } 4038 #endif // PRODUCT 4039 4040 if (PrintCommandLineFlags) { 4041 CommandLineFlags::printSetFlags(tty); 4042 } 4043 4044 // Apply CPU specific policy for the BiasedLocking 4045 if (UseBiasedLocking) { 4046 if (!VM_Version::use_biased_locking() && 4047 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4048 UseBiasedLocking = false; 4049 } 4050 } 4051 #ifdef COMPILER2 4052 if (!UseBiasedLocking || EmitSync != 0) { 4053 UseOptoBiasInlining = false; 4054 } 4055 #endif 4056 4057 return JNI_OK; 4058 } 4059 4060 jint Arguments::adjust_after_os() { 4061 if (UseNUMA) { 4062 if (UseParallelGC || UseParallelOldGC) { 4063 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4064 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4065 } 4066 } 4067 // UseNUMAInterleaving is set to ON for all collectors and 4068 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4069 // such as the parallel collector for Linux and Solaris will 4070 // interleave old gen and survivor spaces on top of NUMA 4071 // allocation policy for the eden space. 4072 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4073 // all platforms and ParallelGC on Windows will interleave all 4074 // of the heap spaces across NUMA nodes. 4075 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4076 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4077 } 4078 } 4079 return JNI_OK; 4080 } 4081 4082 int Arguments::PropertyList_count(SystemProperty* pl) { 4083 int count = 0; 4084 while(pl != NULL) { 4085 count++; 4086 pl = pl->next(); 4087 } 4088 return count; 4089 } 4090 4091 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4092 assert(key != NULL, "just checking"); 4093 SystemProperty* prop; 4094 for (prop = pl; prop != NULL; prop = prop->next()) { 4095 if (strcmp(key, prop->key()) == 0) return prop->value(); 4096 } 4097 return NULL; 4098 } 4099 4100 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4101 int count = 0; 4102 const char* ret_val = NULL; 4103 4104 while(pl != NULL) { 4105 if(count >= index) { 4106 ret_val = pl->key(); 4107 break; 4108 } 4109 count++; 4110 pl = pl->next(); 4111 } 4112 4113 return ret_val; 4114 } 4115 4116 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4117 int count = 0; 4118 char* ret_val = NULL; 4119 4120 while(pl != NULL) { 4121 if(count >= index) { 4122 ret_val = pl->value(); 4123 break; 4124 } 4125 count++; 4126 pl = pl->next(); 4127 } 4128 4129 return ret_val; 4130 } 4131 4132 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4133 SystemProperty* p = *plist; 4134 if (p == NULL) { 4135 *plist = new_p; 4136 } else { 4137 while (p->next() != NULL) { 4138 p = p->next(); 4139 } 4140 p->set_next(new_p); 4141 } 4142 } 4143 4144 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4145 if (plist == NULL) 4146 return; 4147 4148 SystemProperty* new_p = new SystemProperty(k, v, true); 4149 PropertyList_add(plist, new_p); 4150 } 4151 4152 // This add maintains unique property key in the list. 4153 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4154 if (plist == NULL) 4155 return; 4156 4157 // If property key exist then update with new value. 4158 SystemProperty* prop; 4159 for (prop = *plist; prop != NULL; prop = prop->next()) { 4160 if (strcmp(k, prop->key()) == 0) { 4161 if (append) { 4162 prop->append_value(v); 4163 } else { 4164 prop->set_value(v); 4165 } 4166 return; 4167 } 4168 } 4169 4170 PropertyList_add(plist, k, v); 4171 } 4172 4173 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4174 // Returns true if all of the source pointed by src has been copied over to 4175 // the destination buffer pointed by buf. Otherwise, returns false. 4176 // Notes: 4177 // 1. If the length (buflen) of the destination buffer excluding the 4178 // NULL terminator character is not long enough for holding the expanded 4179 // pid characters, it also returns false instead of returning the partially 4180 // expanded one. 4181 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4182 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4183 char* buf, size_t buflen) { 4184 const char* p = src; 4185 char* b = buf; 4186 const char* src_end = &src[srclen]; 4187 char* buf_end = &buf[buflen - 1]; 4188 4189 while (p < src_end && b < buf_end) { 4190 if (*p == '%') { 4191 switch (*(++p)) { 4192 case '%': // "%%" ==> "%" 4193 *b++ = *p++; 4194 break; 4195 case 'p': { // "%p" ==> current process id 4196 // buf_end points to the character before the last character so 4197 // that we could write '\0' to the end of the buffer. 4198 size_t buf_sz = buf_end - b + 1; 4199 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4200 4201 // if jio_snprintf fails or the buffer is not long enough to hold 4202 // the expanded pid, returns false. 4203 if (ret < 0 || ret >= (int)buf_sz) { 4204 return false; 4205 } else { 4206 b += ret; 4207 assert(*b == '\0', "fail in copy_expand_pid"); 4208 if (p == src_end && b == buf_end + 1) { 4209 // reach the end of the buffer. 4210 return true; 4211 } 4212 } 4213 p++; 4214 break; 4215 } 4216 default : 4217 *b++ = '%'; 4218 } 4219 } else { 4220 *b++ = *p++; 4221 } 4222 } 4223 *b = '\0'; 4224 return (p == src_end); // return false if not all of the source was copied 4225 }