1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "classfile/symbolTable.hpp" 29 #include "compiler/compilerOracle.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/cardTableRS.hpp" 32 #include "memory/genCollectedHeap.hpp" 33 #include "memory/referenceProcessor.hpp" 34 #include "memory/universe.inline.hpp" 35 #include "oops/oop.inline.hpp" 36 #include "prims/jvmtiExport.hpp" 37 #include "runtime/arguments.hpp" 38 #include "runtime/globals_extension.hpp" 39 #include "runtime/java.hpp" 40 #include "runtime/os.hpp" 41 #include "runtime/vm_version.hpp" 42 #include "services/management.hpp" 43 #include "services/memTracker.hpp" 44 #include "utilities/defaultStream.hpp" 45 #include "utilities/macros.hpp" 46 #include "utilities/taskqueue.hpp" 47 #if INCLUDE_ALL_GCS 48 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 49 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 50 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 51 #endif // INCLUDE_ALL_GCS 52 53 // Note: This is a special bug reporting site for the JVM 54 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 55 #define DEFAULT_JAVA_LAUNCHER "generic" 56 57 // Disable options not supported in this release, with a warning if they 58 // were explicitly requested on the command-line 59 #define UNSUPPORTED_OPTION(opt, description) \ 60 do { \ 61 if (opt) { \ 62 if (FLAG_IS_CMDLINE(opt)) { \ 63 warning(description " is disabled in this release."); \ 64 } \ 65 FLAG_SET_DEFAULT(opt, false); \ 66 } \ 67 } while(0) 68 69 #define UNSUPPORTED_GC_OPTION(gc) \ 70 do { \ 71 if (gc) { \ 72 if (FLAG_IS_CMDLINE(gc)) { \ 73 warning(#gc " is not supported in this VM. Using Serial GC."); \ 74 } \ 75 FLAG_SET_DEFAULT(gc, false); \ 76 } \ 77 } while(0) 78 79 char** Arguments::_jvm_flags_array = NULL; 80 int Arguments::_num_jvm_flags = 0; 81 char** Arguments::_jvm_args_array = NULL; 82 int Arguments::_num_jvm_args = 0; 83 char* Arguments::_java_command = NULL; 84 SystemProperty* Arguments::_system_properties = NULL; 85 const char* Arguments::_gc_log_filename = NULL; 86 bool Arguments::_has_profile = false; 87 size_t Arguments::_conservative_max_heap_alignment = 0; 88 uintx Arguments::_min_heap_size = 0; 89 Arguments::Mode Arguments::_mode = _mixed; 90 bool Arguments::_java_compiler = false; 91 bool Arguments::_xdebug_mode = false; 92 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 94 int Arguments::_sun_java_launcher_pid = -1; 95 bool Arguments::_sun_java_launcher_is_altjvm = false; 96 97 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 98 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 99 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 100 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 101 bool Arguments::_ClipInlining = ClipInlining; 102 103 char* Arguments::SharedArchivePath = NULL; 104 105 AgentLibraryList Arguments::_libraryList; 106 AgentLibraryList Arguments::_agentList; 107 108 abort_hook_t Arguments::_abort_hook = NULL; 109 exit_hook_t Arguments::_exit_hook = NULL; 110 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 111 112 113 SystemProperty *Arguments::_java_ext_dirs = NULL; 114 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 115 SystemProperty *Arguments::_sun_boot_library_path = NULL; 116 SystemProperty *Arguments::_java_library_path = NULL; 117 SystemProperty *Arguments::_java_home = NULL; 118 SystemProperty *Arguments::_java_class_path = NULL; 119 SystemProperty *Arguments::_sun_boot_class_path = NULL; 120 121 char* Arguments::_meta_index_path = NULL; 122 char* Arguments::_meta_index_dir = NULL; 123 124 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 125 126 static bool match_option(const JavaVMOption *option, const char* name, 127 const char** tail) { 128 int len = (int)strlen(name); 129 if (strncmp(option->optionString, name, len) == 0) { 130 *tail = option->optionString + len; 131 return true; 132 } else { 133 return false; 134 } 135 } 136 137 static void logOption(const char* opt) { 138 if (PrintVMOptions) { 139 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 140 } 141 } 142 143 // Process java launcher properties. 144 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 145 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 146 // sun.java.launcher.pid is defined. 147 // Must do this before setting up other system properties, 148 // as some of them may depend on launcher type. 149 for (int index = 0; index < args->nOptions; index++) { 150 const JavaVMOption* option = args->options + index; 151 const char* tail; 152 153 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 154 process_java_launcher_argument(tail, option->extraInfo); 155 continue; 156 } 157 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 158 if (strcmp(tail, "true") == 0) { 159 _sun_java_launcher_is_altjvm = true; 160 } 161 continue; 162 } 163 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 164 _sun_java_launcher_pid = atoi(tail); 165 continue; 166 } 167 } 168 } 169 170 // Initialize system properties key and value. 171 void Arguments::init_system_properties() { 172 173 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 174 "Java Virtual Machine Specification", false)); 175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 176 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 178 179 // Following are JVMTI agent writable properties. 180 // Properties values are set to NULL and they are 181 // os specific they are initialized in os::init_system_properties_values(). 182 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 183 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 184 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 185 _java_library_path = new SystemProperty("java.library.path", NULL, true); 186 _java_home = new SystemProperty("java.home", NULL, true); 187 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 188 189 _java_class_path = new SystemProperty("java.class.path", "", true); 190 191 // Add to System Property list. 192 PropertyList_add(&_system_properties, _java_ext_dirs); 193 PropertyList_add(&_system_properties, _java_endorsed_dirs); 194 PropertyList_add(&_system_properties, _sun_boot_library_path); 195 PropertyList_add(&_system_properties, _java_library_path); 196 PropertyList_add(&_system_properties, _java_home); 197 PropertyList_add(&_system_properties, _java_class_path); 198 PropertyList_add(&_system_properties, _sun_boot_class_path); 199 200 // Set OS specific system properties values 201 os::init_system_properties_values(); 202 } 203 204 205 // Update/Initialize System properties after JDK version number is known 206 void Arguments::init_version_specific_system_properties() { 207 enum { bufsz = 16 }; 208 char buffer[bufsz]; 209 const char* spec_vendor = "Sun Microsystems Inc."; 210 uint32_t spec_version = 0; 211 212 spec_vendor = "Oracle Corporation"; 213 spec_version = JDK_Version::current().major_version(); 214 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 215 216 PropertyList_add(&_system_properties, 217 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 218 PropertyList_add(&_system_properties, 219 new SystemProperty("java.vm.specification.version", buffer, false)); 220 PropertyList_add(&_system_properties, 221 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 222 } 223 224 /** 225 * Provide a slightly more user-friendly way of eliminating -XX flags. 226 * When a flag is eliminated, it can be added to this list in order to 227 * continue accepting this flag on the command-line, while issuing a warning 228 * and ignoring the value. Once the JDK version reaches the 'accept_until' 229 * limit, we flatly refuse to admit the existence of the flag. This allows 230 * a flag to die correctly over JDK releases using HSX. 231 */ 232 typedef struct { 233 const char* name; 234 JDK_Version obsoleted_in; // when the flag went away 235 JDK_Version accept_until; // which version to start denying the existence 236 } ObsoleteFlag; 237 238 static ObsoleteFlag obsolete_jvm_flags[] = { 239 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 240 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 241 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 242 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 243 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 244 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 245 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 246 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 253 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 254 { "DefaultInitialRAMFraction", 255 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 256 { "UseDepthFirstScavengeOrder", 257 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 258 { "HandlePromotionFailure", 259 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 260 { "MaxLiveObjectEvacuationRatio", 261 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 262 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 263 { "UseParallelOldGCCompacting", 264 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 265 { "UseParallelDensePrefixUpdate", 266 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 267 { "UseParallelOldGCDensePrefix", 268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 269 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 270 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 271 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 272 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 273 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 274 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 275 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 276 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 277 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 278 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 290 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 291 #ifdef PRODUCT 292 { "DesiredMethodLimit", 293 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 294 #endif // PRODUCT 295 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 297 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 298 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 299 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 300 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 301 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 302 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 303 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 304 #ifndef ZERO 305 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 306 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 307 #endif // ZERO 308 { NULL, JDK_Version(0), JDK_Version(0) } 309 }; 310 311 // Returns true if the flag is obsolete and fits into the range specified 312 // for being ignored. In the case that the flag is ignored, the 'version' 313 // value is filled in with the version number when the flag became 314 // obsolete so that that value can be displayed to the user. 315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 316 int i = 0; 317 assert(version != NULL, "Must provide a version buffer"); 318 while (obsolete_jvm_flags[i].name != NULL) { 319 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 320 // <flag>=xxx form 321 // [-|+]<flag> form 322 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 323 ((s[0] == '+' || s[0] == '-') && 324 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 325 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 326 *version = flag_status.obsoleted_in; 327 return true; 328 } 329 } 330 i++; 331 } 332 return false; 333 } 334 335 // Constructs the system class path (aka boot class path) from the following 336 // components, in order: 337 // 338 // prefix // from -Xbootclasspath/p:... 339 // endorsed // the expansion of -Djava.endorsed.dirs=... 340 // base // from os::get_system_properties() or -Xbootclasspath= 341 // suffix // from -Xbootclasspath/a:... 342 // 343 // java.endorsed.dirs is a list of directories; any jar or zip files in the 344 // directories are added to the sysclasspath just before the base. 345 // 346 // This could be AllStatic, but it isn't needed after argument processing is 347 // complete. 348 class SysClassPath: public StackObj { 349 public: 350 SysClassPath(const char* base); 351 ~SysClassPath(); 352 353 inline void set_base(const char* base); 354 inline void add_prefix(const char* prefix); 355 inline void add_suffix_to_prefix(const char* suffix); 356 inline void add_suffix(const char* suffix); 357 inline void reset_path(const char* base); 358 359 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 360 // property. Must be called after all command-line arguments have been 361 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 362 // combined_path(). 363 void expand_endorsed(); 364 365 inline const char* get_base() const { return _items[_scp_base]; } 366 inline const char* get_prefix() const { return _items[_scp_prefix]; } 367 inline const char* get_suffix() const { return _items[_scp_suffix]; } 368 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 369 370 // Combine all the components into a single c-heap-allocated string; caller 371 // must free the string if/when no longer needed. 372 char* combined_path(); 373 374 private: 375 // Utility routines. 376 static char* add_to_path(const char* path, const char* str, bool prepend); 377 static char* add_jars_to_path(char* path, const char* directory); 378 379 inline void reset_item_at(int index); 380 381 // Array indices for the items that make up the sysclasspath. All except the 382 // base are allocated in the C heap and freed by this class. 383 enum { 384 _scp_prefix, // from -Xbootclasspath/p:... 385 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 386 _scp_base, // the default sysclasspath 387 _scp_suffix, // from -Xbootclasspath/a:... 388 _scp_nitems // the number of items, must be last. 389 }; 390 391 const char* _items[_scp_nitems]; 392 DEBUG_ONLY(bool _expansion_done;) 393 }; 394 395 SysClassPath::SysClassPath(const char* base) { 396 memset(_items, 0, sizeof(_items)); 397 _items[_scp_base] = base; 398 DEBUG_ONLY(_expansion_done = false;) 399 } 400 401 SysClassPath::~SysClassPath() { 402 // Free everything except the base. 403 for (int i = 0; i < _scp_nitems; ++i) { 404 if (i != _scp_base) reset_item_at(i); 405 } 406 DEBUG_ONLY(_expansion_done = false;) 407 } 408 409 inline void SysClassPath::set_base(const char* base) { 410 _items[_scp_base] = base; 411 } 412 413 inline void SysClassPath::add_prefix(const char* prefix) { 414 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 415 } 416 417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 419 } 420 421 inline void SysClassPath::add_suffix(const char* suffix) { 422 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 423 } 424 425 inline void SysClassPath::reset_item_at(int index) { 426 assert(index < _scp_nitems && index != _scp_base, "just checking"); 427 if (_items[index] != NULL) { 428 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 429 _items[index] = NULL; 430 } 431 } 432 433 inline void SysClassPath::reset_path(const char* base) { 434 // Clear the prefix and suffix. 435 reset_item_at(_scp_prefix); 436 reset_item_at(_scp_suffix); 437 set_base(base); 438 } 439 440 //------------------------------------------------------------------------------ 441 442 void SysClassPath::expand_endorsed() { 443 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 444 445 const char* path = Arguments::get_property("java.endorsed.dirs"); 446 if (path == NULL) { 447 path = Arguments::get_endorsed_dir(); 448 assert(path != NULL, "no default for java.endorsed.dirs"); 449 } 450 451 char* expanded_path = NULL; 452 const char separator = *os::path_separator(); 453 const char* const end = path + strlen(path); 454 while (path < end) { 455 const char* tmp_end = strchr(path, separator); 456 if (tmp_end == NULL) { 457 expanded_path = add_jars_to_path(expanded_path, path); 458 path = end; 459 } else { 460 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 461 memcpy(dirpath, path, tmp_end - path); 462 dirpath[tmp_end - path] = '\0'; 463 expanded_path = add_jars_to_path(expanded_path, dirpath); 464 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 465 path = tmp_end + 1; 466 } 467 } 468 _items[_scp_endorsed] = expanded_path; 469 DEBUG_ONLY(_expansion_done = true;) 470 } 471 472 // Combine the bootclasspath elements, some of which may be null, into a single 473 // c-heap-allocated string. 474 char* SysClassPath::combined_path() { 475 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 476 assert(_expansion_done, "must call expand_endorsed() first."); 477 478 size_t lengths[_scp_nitems]; 479 size_t total_len = 0; 480 481 const char separator = *os::path_separator(); 482 483 // Get the lengths. 484 int i; 485 for (i = 0; i < _scp_nitems; ++i) { 486 if (_items[i] != NULL) { 487 lengths[i] = strlen(_items[i]); 488 // Include space for the separator char (or a NULL for the last item). 489 total_len += lengths[i] + 1; 490 } 491 } 492 assert(total_len > 0, "empty sysclasspath not allowed"); 493 494 // Copy the _items to a single string. 495 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 496 char* cp_tmp = cp; 497 for (i = 0; i < _scp_nitems; ++i) { 498 if (_items[i] != NULL) { 499 memcpy(cp_tmp, _items[i], lengths[i]); 500 cp_tmp += lengths[i]; 501 *cp_tmp++ = separator; 502 } 503 } 504 *--cp_tmp = '\0'; // Replace the extra separator. 505 return cp; 506 } 507 508 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 509 char* 510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 511 char *cp; 512 513 assert(str != NULL, "just checking"); 514 if (path == NULL) { 515 size_t len = strlen(str) + 1; 516 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 517 memcpy(cp, str, len); // copy the trailing null 518 } else { 519 const char separator = *os::path_separator(); 520 size_t old_len = strlen(path); 521 size_t str_len = strlen(str); 522 size_t len = old_len + str_len + 2; 523 524 if (prepend) { 525 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 526 char* cp_tmp = cp; 527 memcpy(cp_tmp, str, str_len); 528 cp_tmp += str_len; 529 *cp_tmp = separator; 530 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 531 FREE_C_HEAP_ARRAY(char, path, mtInternal); 532 } else { 533 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 534 char* cp_tmp = cp + old_len; 535 *cp_tmp = separator; 536 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 537 } 538 } 539 return cp; 540 } 541 542 // Scan the directory and append any jar or zip files found to path. 543 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 545 DIR* dir = os::opendir(directory); 546 if (dir == NULL) return path; 547 548 char dir_sep[2] = { '\0', '\0' }; 549 size_t directory_len = strlen(directory); 550 const char fileSep = *os::file_separator(); 551 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 552 553 /* Scan the directory for jars/zips, appending them to path. */ 554 struct dirent *entry; 555 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 556 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 557 const char* name = entry->d_name; 558 const char* ext = name + strlen(name) - 4; 559 bool isJarOrZip = ext > name && 560 (os::file_name_strcmp(ext, ".jar") == 0 || 561 os::file_name_strcmp(ext, ".zip") == 0); 562 if (isJarOrZip) { 563 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 564 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 565 path = add_to_path(path, jarpath, false); 566 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 567 } 568 } 569 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 570 os::closedir(dir); 571 return path; 572 } 573 574 // Parses a memory size specification string. 575 static bool atomull(const char *s, julong* result) { 576 julong n = 0; 577 int args_read = 0; 578 bool is_hex = false; 579 // Skip leading 0[xX] for hexadecimal 580 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 581 s += 2; 582 is_hex = true; 583 args_read = sscanf(s, JULONG_FORMAT_X, &n); 584 } else { 585 args_read = sscanf(s, JULONG_FORMAT, &n); 586 } 587 if (args_read != 1) { 588 return false; 589 } 590 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 591 s++; 592 } 593 // 4705540: illegal if more characters are found after the first non-digit 594 if (strlen(s) > 1) { 595 return false; 596 } 597 switch (*s) { 598 case 'T': case 't': 599 *result = n * G * K; 600 // Check for overflow. 601 if (*result/((julong)G * K) != n) return false; 602 return true; 603 case 'G': case 'g': 604 *result = n * G; 605 if (*result/G != n) return false; 606 return true; 607 case 'M': case 'm': 608 *result = n * M; 609 if (*result/M != n) return false; 610 return true; 611 case 'K': case 'k': 612 *result = n * K; 613 if (*result/K != n) return false; 614 return true; 615 case '\0': 616 *result = n; 617 return true; 618 default: 619 return false; 620 } 621 } 622 623 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 624 if (size < min_size) return arg_too_small; 625 // Check that size will fit in a size_t (only relevant on 32-bit) 626 if (size > max_uintx) return arg_too_big; 627 return arg_in_range; 628 } 629 630 // Describe an argument out of range error 631 void Arguments::describe_range_error(ArgsRange errcode) { 632 switch(errcode) { 633 case arg_too_big: 634 jio_fprintf(defaultStream::error_stream(), 635 "The specified size exceeds the maximum " 636 "representable size.\n"); 637 break; 638 case arg_too_small: 639 case arg_unreadable: 640 case arg_in_range: 641 // do nothing for now 642 break; 643 default: 644 ShouldNotReachHere(); 645 } 646 } 647 648 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 649 return CommandLineFlags::boolAtPut(name, &value, origin); 650 } 651 652 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 653 double v; 654 if (sscanf(value, "%lf", &v) != 1) { 655 return false; 656 } 657 658 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 659 return true; 660 } 661 return false; 662 } 663 664 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 665 julong v; 666 intx intx_v; 667 bool is_neg = false; 668 // Check the sign first since atomull() parses only unsigned values. 669 if (*value == '-') { 670 if (!CommandLineFlags::intxAt(name, &intx_v)) { 671 return false; 672 } 673 value++; 674 is_neg = true; 675 } 676 if (!atomull(value, &v)) { 677 return false; 678 } 679 intx_v = (intx) v; 680 if (is_neg) { 681 intx_v = -intx_v; 682 } 683 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 684 return true; 685 } 686 uintx uintx_v = (uintx) v; 687 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 688 return true; 689 } 690 uint64_t uint64_t_v = (uint64_t) v; 691 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 692 return true; 693 } 694 return false; 695 } 696 697 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 698 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 699 // Contract: CommandLineFlags always returns a pointer that needs freeing. 700 FREE_C_HEAP_ARRAY(char, value, mtInternal); 701 return true; 702 } 703 704 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 705 const char* old_value = ""; 706 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 707 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 708 size_t new_len = strlen(new_value); 709 const char* value; 710 char* free_this_too = NULL; 711 if (old_len == 0) { 712 value = new_value; 713 } else if (new_len == 0) { 714 value = old_value; 715 } else { 716 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 717 // each new setting adds another LINE to the switch: 718 sprintf(buf, "%s\n%s", old_value, new_value); 719 value = buf; 720 free_this_too = buf; 721 } 722 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 723 // CommandLineFlags always returns a pointer that needs freeing. 724 FREE_C_HEAP_ARRAY(char, value, mtInternal); 725 if (free_this_too != NULL) { 726 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 727 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 728 } 729 return true; 730 } 731 732 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 733 734 // range of acceptable characters spelled out for portability reasons 735 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 736 #define BUFLEN 255 737 char name[BUFLEN+1]; 738 char dummy; 739 740 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 741 return set_bool_flag(name, false, origin); 742 } 743 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 744 return set_bool_flag(name, true, origin); 745 } 746 747 char punct; 748 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 749 const char* value = strchr(arg, '=') + 1; 750 Flag* flag = Flag::find_flag(name, strlen(name)); 751 if (flag != NULL && flag->is_ccstr()) { 752 if (flag->ccstr_accumulates()) { 753 return append_to_string_flag(name, value, origin); 754 } else { 755 if (value[0] == '\0') { 756 value = NULL; 757 } 758 return set_string_flag(name, value, origin); 759 } 760 } 761 } 762 763 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 764 const char* value = strchr(arg, '=') + 1; 765 // -XX:Foo:=xxx will reset the string flag to the given value. 766 if (value[0] == '\0') { 767 value = NULL; 768 } 769 return set_string_flag(name, value, origin); 770 } 771 772 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 773 #define SIGNED_NUMBER_RANGE "[-0123456789]" 774 #define NUMBER_RANGE "[0123456789]" 775 char value[BUFLEN + 1]; 776 char value2[BUFLEN + 1]; 777 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 778 // Looks like a floating-point number -- try again with more lenient format string 779 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 780 return set_fp_numeric_flag(name, value, origin); 781 } 782 } 783 784 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 785 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 786 return set_numeric_flag(name, value, origin); 787 } 788 789 return false; 790 } 791 792 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 793 assert(bldarray != NULL, "illegal argument"); 794 795 if (arg == NULL) { 796 return; 797 } 798 799 int new_count = *count + 1; 800 801 // expand the array and add arg to the last element 802 if (*bldarray == NULL) { 803 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 804 } else { 805 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 806 } 807 (*bldarray)[*count] = os::strdup_check_oom(arg); 808 *count = new_count; 809 } 810 811 void Arguments::build_jvm_args(const char* arg) { 812 add_string(&_jvm_args_array, &_num_jvm_args, arg); 813 } 814 815 void Arguments::build_jvm_flags(const char* arg) { 816 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 817 } 818 819 // utility function to return a string that concatenates all 820 // strings in a given char** array 821 const char* Arguments::build_resource_string(char** args, int count) { 822 if (args == NULL || count == 0) { 823 return NULL; 824 } 825 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 826 for (int i = 1; i < count; i++) { 827 length += strlen(args[i]) + 1; // add 1 for a space 828 } 829 char* s = NEW_RESOURCE_ARRAY(char, length); 830 strcpy(s, args[0]); 831 for (int j = 1; j < count; j++) { 832 strcat(s, " "); 833 strcat(s, args[j]); 834 } 835 return (const char*) s; 836 } 837 838 void Arguments::print_on(outputStream* st) { 839 st->print_cr("VM Arguments:"); 840 if (num_jvm_flags() > 0) { 841 st->print("jvm_flags: "); print_jvm_flags_on(st); 842 } 843 if (num_jvm_args() > 0) { 844 st->print("jvm_args: "); print_jvm_args_on(st); 845 } 846 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 847 if (_java_class_path != NULL) { 848 char* path = _java_class_path->value(); 849 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 850 } 851 st->print_cr("Launcher Type: %s", _sun_java_launcher); 852 } 853 854 void Arguments::print_jvm_flags_on(outputStream* st) { 855 if (_num_jvm_flags > 0) { 856 for (int i=0; i < _num_jvm_flags; i++) { 857 st->print("%s ", _jvm_flags_array[i]); 858 } 859 st->cr(); 860 } 861 } 862 863 void Arguments::print_jvm_args_on(outputStream* st) { 864 if (_num_jvm_args > 0) { 865 for (int i=0; i < _num_jvm_args; i++) { 866 st->print("%s ", _jvm_args_array[i]); 867 } 868 st->cr(); 869 } 870 } 871 872 bool Arguments::process_argument(const char* arg, 873 jboolean ignore_unrecognized, Flag::Flags origin) { 874 875 JDK_Version since = JDK_Version(); 876 877 if (parse_argument(arg, origin) || ignore_unrecognized) { 878 return true; 879 } 880 881 bool has_plus_minus = (*arg == '+' || *arg == '-'); 882 const char* const argname = has_plus_minus ? arg + 1 : arg; 883 if (is_newly_obsolete(arg, &since)) { 884 char version[256]; 885 since.to_string(version, sizeof(version)); 886 warning("ignoring option %s; support was removed in %s", argname, version); 887 return true; 888 } 889 890 // For locked flags, report a custom error message if available. 891 // Otherwise, report the standard unrecognized VM option. 892 893 size_t arg_len; 894 const char* equal_sign = strchr(argname, '='); 895 if (equal_sign == NULL) { 896 arg_len = strlen(argname); 897 } else { 898 arg_len = equal_sign - argname; 899 } 900 901 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 902 if (found_flag != NULL) { 903 char locked_message_buf[BUFLEN]; 904 found_flag->get_locked_message(locked_message_buf, BUFLEN); 905 if (strlen(locked_message_buf) == 0) { 906 if (found_flag->is_bool() && !has_plus_minus) { 907 jio_fprintf(defaultStream::error_stream(), 908 "Missing +/- setting for VM option '%s'\n", argname); 909 } else if (!found_flag->is_bool() && has_plus_minus) { 910 jio_fprintf(defaultStream::error_stream(), 911 "Unexpected +/- setting in VM option '%s'\n", argname); 912 } else { 913 jio_fprintf(defaultStream::error_stream(), 914 "Improperly specified VM option '%s'\n", argname); 915 } 916 } else { 917 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 918 } 919 } else { 920 jio_fprintf(defaultStream::error_stream(), 921 "Unrecognized VM option '%s'\n", argname); 922 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 923 if (fuzzy_matched != NULL) { 924 jio_fprintf(defaultStream::error_stream(), 925 "Did you mean '%s%s%s'?\n", 926 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 927 fuzzy_matched->_name, 928 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 929 } 930 } 931 932 // allow for commandline "commenting out" options like -XX:#+Verbose 933 return arg[0] == '#'; 934 } 935 936 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 937 FILE* stream = fopen(file_name, "rb"); 938 if (stream == NULL) { 939 if (should_exist) { 940 jio_fprintf(defaultStream::error_stream(), 941 "Could not open settings file %s\n", file_name); 942 return false; 943 } else { 944 return true; 945 } 946 } 947 948 char token[1024]; 949 int pos = 0; 950 951 bool in_white_space = true; 952 bool in_comment = false; 953 bool in_quote = false; 954 char quote_c = 0; 955 bool result = true; 956 957 int c = getc(stream); 958 while(c != EOF && pos < (int)(sizeof(token)-1)) { 959 if (in_white_space) { 960 if (in_comment) { 961 if (c == '\n') in_comment = false; 962 } else { 963 if (c == '#') in_comment = true; 964 else if (!isspace(c)) { 965 in_white_space = false; 966 token[pos++] = c; 967 } 968 } 969 } else { 970 if (c == '\n' || (!in_quote && isspace(c))) { 971 // token ends at newline, or at unquoted whitespace 972 // this allows a way to include spaces in string-valued options 973 token[pos] = '\0'; 974 logOption(token); 975 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 976 build_jvm_flags(token); 977 pos = 0; 978 in_white_space = true; 979 in_quote = false; 980 } else if (!in_quote && (c == '\'' || c == '"')) { 981 in_quote = true; 982 quote_c = c; 983 } else if (in_quote && (c == quote_c)) { 984 in_quote = false; 985 } else { 986 token[pos++] = c; 987 } 988 } 989 c = getc(stream); 990 } 991 if (pos > 0) { 992 token[pos] = '\0'; 993 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 994 build_jvm_flags(token); 995 } 996 fclose(stream); 997 return result; 998 } 999 1000 //============================================================================================================= 1001 // Parsing of properties (-D) 1002 1003 const char* Arguments::get_property(const char* key) { 1004 return PropertyList_get_value(system_properties(), key); 1005 } 1006 1007 bool Arguments::add_property(const char* prop) { 1008 const char* eq = strchr(prop, '='); 1009 char* key; 1010 // ns must be static--its address may be stored in a SystemProperty object. 1011 const static char ns[1] = {0}; 1012 char* value = (char *)ns; 1013 1014 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1015 key = AllocateHeap(key_len + 1, mtInternal); 1016 strncpy(key, prop, key_len); 1017 key[key_len] = '\0'; 1018 1019 if (eq != NULL) { 1020 size_t value_len = strlen(prop) - key_len - 1; 1021 value = AllocateHeap(value_len + 1, mtInternal); 1022 strncpy(value, &prop[key_len + 1], value_len + 1); 1023 } 1024 1025 if (strcmp(key, "java.compiler") == 0) { 1026 process_java_compiler_argument(value); 1027 FreeHeap(key); 1028 if (eq != NULL) { 1029 FreeHeap(value); 1030 } 1031 return true; 1032 } else if (strcmp(key, "sun.java.command") == 0) { 1033 _java_command = value; 1034 1035 // Record value in Arguments, but let it get passed to Java. 1036 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1037 strcmp(key, "sun.java.launcher.pid") == 0) { 1038 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1039 // private and are processed in process_sun_java_launcher_properties(); 1040 // the sun.java.launcher property is passed on to the java application 1041 FreeHeap(key); 1042 if (eq != NULL) { 1043 FreeHeap(value); 1044 } 1045 return true; 1046 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1047 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1048 // its value without going through the property list or making a Java call. 1049 _java_vendor_url_bug = value; 1050 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1051 PropertyList_unique_add(&_system_properties, key, value, true); 1052 return true; 1053 } 1054 // Create new property and add at the end of the list 1055 PropertyList_unique_add(&_system_properties, key, value); 1056 return true; 1057 } 1058 1059 //=========================================================================================================== 1060 // Setting int/mixed/comp mode flags 1061 1062 void Arguments::set_mode_flags(Mode mode) { 1063 // Set up default values for all flags. 1064 // If you add a flag to any of the branches below, 1065 // add a default value for it here. 1066 set_java_compiler(false); 1067 _mode = mode; 1068 1069 // Ensure Agent_OnLoad has the correct initial values. 1070 // This may not be the final mode; mode may change later in onload phase. 1071 PropertyList_unique_add(&_system_properties, "java.vm.info", 1072 (char*)VM_Version::vm_info_string(), false); 1073 1074 UseInterpreter = true; 1075 UseCompiler = true; 1076 UseLoopCounter = true; 1077 1078 // Default values may be platform/compiler dependent - 1079 // use the saved values 1080 ClipInlining = Arguments::_ClipInlining; 1081 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1082 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1083 BackgroundCompilation = Arguments::_BackgroundCompilation; 1084 1085 // Change from defaults based on mode 1086 switch (mode) { 1087 default: 1088 ShouldNotReachHere(); 1089 break; 1090 case _int: 1091 UseCompiler = false; 1092 UseLoopCounter = false; 1093 AlwaysCompileLoopMethods = false; 1094 UseOnStackReplacement = false; 1095 break; 1096 case _mixed: 1097 // same as default 1098 break; 1099 case _comp: 1100 UseInterpreter = false; 1101 BackgroundCompilation = false; 1102 ClipInlining = false; 1103 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1104 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1105 // compile a level 4 (C2) and then continue executing it. 1106 if (TieredCompilation) { 1107 Tier3InvokeNotifyFreqLog = 0; 1108 Tier4InvocationThreshold = 0; 1109 } 1110 break; 1111 } 1112 } 1113 1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1115 // Conflict: required to use shared spaces (-Xshare:on), but 1116 // incompatible command line options were chosen. 1117 1118 static void no_shared_spaces() { 1119 if (RequireSharedSpaces) { 1120 jio_fprintf(defaultStream::error_stream(), 1121 "Class data sharing is inconsistent with other specified options.\n"); 1122 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1123 } else { 1124 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1125 } 1126 } 1127 #endif 1128 1129 void Arguments::set_tiered_flags() { 1130 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1131 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1132 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1133 } 1134 if (CompilationPolicyChoice < 2) { 1135 vm_exit_during_initialization( 1136 "Incompatible compilation policy selected", NULL); 1137 } 1138 // Increase the code cache size - tiered compiles a lot more. 1139 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1140 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1141 } 1142 if (!UseInterpreter) { // -Xcomp 1143 Tier3InvokeNotifyFreqLog = 0; 1144 Tier4InvocationThreshold = 0; 1145 } 1146 } 1147 1148 /** 1149 * Returns the minimum number of compiler threads needed to run the JVM. The following 1150 * configurations are possible. 1151 * 1152 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1153 * compiler threads is 0. 1154 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1155 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1156 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1157 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1158 * C1 can be used, so the minimum number of compiler threads is 1. 1159 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1160 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1161 * the minimum number of compiler threads is 2. 1162 */ 1163 int Arguments::get_min_number_of_compiler_threads() { 1164 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1165 return 0; // case 1 1166 #else 1167 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1168 return 1; // case 2 or case 3 1169 } 1170 return 2; // case 4 (tiered) 1171 #endif 1172 } 1173 1174 #if INCLUDE_ALL_GCS 1175 static void disable_adaptive_size_policy(const char* collector_name) { 1176 if (UseAdaptiveSizePolicy) { 1177 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1178 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1179 collector_name); 1180 } 1181 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1182 } 1183 } 1184 1185 void Arguments::set_parnew_gc_flags() { 1186 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1187 "control point invariant"); 1188 assert(UseParNewGC, "Error"); 1189 1190 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1191 disable_adaptive_size_policy("UseParNewGC"); 1192 1193 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1194 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1195 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1196 } else if (ParallelGCThreads == 0) { 1197 jio_fprintf(defaultStream::error_stream(), 1198 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1199 vm_exit(1); 1200 } 1201 1202 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1203 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1204 // we set them to 1024 and 1024. 1205 // See CR 6362902. 1206 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1207 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1208 } 1209 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1210 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1211 } 1212 1213 // When using compressed oops, we use local overflow stacks, 1214 // rather than using a global overflow list chained through 1215 // the klass word of the object's pre-image. 1216 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1217 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1218 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1219 } 1220 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1221 } 1222 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1223 } 1224 1225 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1226 // sparc/solaris for certain applications, but would gain from 1227 // further optimization and tuning efforts, and would almost 1228 // certainly gain from analysis of platform and environment. 1229 void Arguments::set_cms_and_parnew_gc_flags() { 1230 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1231 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1232 1233 // If we are using CMS, we prefer to UseParNewGC, 1234 // unless explicitly forbidden. 1235 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1236 FLAG_SET_ERGO(bool, UseParNewGC, true); 1237 } 1238 1239 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1240 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1241 1242 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1243 // as needed. 1244 if (UseParNewGC) { 1245 set_parnew_gc_flags(); 1246 } 1247 1248 size_t max_heap = align_size_down(MaxHeapSize, 1249 CardTableRS::ct_max_alignment_constraint()); 1250 1251 // Now make adjustments for CMS 1252 intx tenuring_default = (intx)6; 1253 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1254 1255 // Preferred young gen size for "short" pauses: 1256 // upper bound depends on # of threads and NewRatio. 1257 const uintx parallel_gc_threads = 1258 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1259 const size_t preferred_max_new_size_unaligned = 1260 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1261 size_t preferred_max_new_size = 1262 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1263 1264 // Unless explicitly requested otherwise, size young gen 1265 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1266 1267 // If either MaxNewSize or NewRatio is set on the command line, 1268 // assume the user is trying to set the size of the young gen. 1269 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1270 1271 // Set MaxNewSize to our calculated preferred_max_new_size unless 1272 // NewSize was set on the command line and it is larger than 1273 // preferred_max_new_size. 1274 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1275 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1276 } else { 1277 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1278 } 1279 if (PrintGCDetails && Verbose) { 1280 // Too early to use gclog_or_tty 1281 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1282 } 1283 1284 // Code along this path potentially sets NewSize and OldSize 1285 if (PrintGCDetails && Verbose) { 1286 // Too early to use gclog_or_tty 1287 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1288 " initial_heap_size: " SIZE_FORMAT 1289 " max_heap: " SIZE_FORMAT, 1290 min_heap_size(), InitialHeapSize, max_heap); 1291 } 1292 size_t min_new = preferred_max_new_size; 1293 if (FLAG_IS_CMDLINE(NewSize)) { 1294 min_new = NewSize; 1295 } 1296 if (max_heap > min_new && min_heap_size() > min_new) { 1297 // Unless explicitly requested otherwise, make young gen 1298 // at least min_new, and at most preferred_max_new_size. 1299 if (FLAG_IS_DEFAULT(NewSize)) { 1300 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1301 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1302 if (PrintGCDetails && Verbose) { 1303 // Too early to use gclog_or_tty 1304 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1305 } 1306 } 1307 // Unless explicitly requested otherwise, size old gen 1308 // so it's NewRatio x of NewSize. 1309 if (FLAG_IS_DEFAULT(OldSize)) { 1310 if (max_heap > NewSize) { 1311 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1312 if (PrintGCDetails && Verbose) { 1313 // Too early to use gclog_or_tty 1314 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1315 } 1316 } 1317 } 1318 } 1319 } 1320 // Unless explicitly requested otherwise, definitely 1321 // promote all objects surviving "tenuring_default" scavenges. 1322 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1323 FLAG_IS_DEFAULT(SurvivorRatio)) { 1324 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1325 } 1326 // If we decided above (or user explicitly requested) 1327 // `promote all' (via MaxTenuringThreshold := 0), 1328 // prefer minuscule survivor spaces so as not to waste 1329 // space for (non-existent) survivors 1330 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1331 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1332 } 1333 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1334 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1335 // This is done in order to make ParNew+CMS configuration to work 1336 // with YoungPLABSize and OldPLABSize options. 1337 // See CR 6362902. 1338 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1339 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1340 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1341 // is. In this situation let CMSParPromoteBlocksToClaim follow 1342 // the value (either from the command line or ergonomics) of 1343 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1344 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1345 } else { 1346 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1347 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1348 // we'll let it to take precedence. 1349 jio_fprintf(defaultStream::error_stream(), 1350 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1351 " options are specified for the CMS collector." 1352 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1353 } 1354 } 1355 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1356 // OldPLAB sizing manually turned off: Use a larger default setting, 1357 // unless it was manually specified. This is because a too-low value 1358 // will slow down scavenges. 1359 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1360 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1361 } 1362 } 1363 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1364 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1365 // If either of the static initialization defaults have changed, note this 1366 // modification. 1367 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1368 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1369 } 1370 if (PrintGCDetails && Verbose) { 1371 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1372 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1373 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1374 } 1375 } 1376 #endif // INCLUDE_ALL_GCS 1377 1378 void set_object_alignment() { 1379 // Object alignment. 1380 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1381 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1382 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1383 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1384 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1385 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1386 1387 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1388 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1389 1390 // Oop encoding heap max 1391 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1392 1393 #if INCLUDE_ALL_GCS 1394 // Set CMS global values 1395 CompactibleFreeListSpace::set_cms_values(); 1396 #endif // INCLUDE_ALL_GCS 1397 } 1398 1399 bool verify_object_alignment() { 1400 // Object alignment. 1401 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1402 jio_fprintf(defaultStream::error_stream(), 1403 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1404 (int)ObjectAlignmentInBytes); 1405 return false; 1406 } 1407 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1408 jio_fprintf(defaultStream::error_stream(), 1409 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1410 (int)ObjectAlignmentInBytes, BytesPerLong); 1411 return false; 1412 } 1413 // It does not make sense to have big object alignment 1414 // since a space lost due to alignment will be greater 1415 // then a saved space from compressed oops. 1416 if ((int)ObjectAlignmentInBytes > 256) { 1417 jio_fprintf(defaultStream::error_stream(), 1418 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1419 (int)ObjectAlignmentInBytes); 1420 return false; 1421 } 1422 // In case page size is very small. 1423 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1424 jio_fprintf(defaultStream::error_stream(), 1425 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1426 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1427 return false; 1428 } 1429 if(SurvivorAlignmentInBytes == 0) { 1430 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1431 } else { 1432 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1433 jio_fprintf(defaultStream::error_stream(), 1434 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1435 (int)SurvivorAlignmentInBytes); 1436 return false; 1437 } 1438 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1439 jio_fprintf(defaultStream::error_stream(), 1440 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1441 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1442 return false; 1443 } 1444 } 1445 return true; 1446 } 1447 1448 size_t Arguments::max_heap_for_compressed_oops() { 1449 // Avoid sign flip. 1450 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1451 // We need to fit both the NULL page and the heap into the memory budget, while 1452 // keeping alignment constraints of the heap. To guarantee the latter, as the 1453 // NULL page is located before the heap, we pad the NULL page to the conservative 1454 // maximum alignment that the GC may ever impose upon the heap. 1455 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1456 _conservative_max_heap_alignment); 1457 1458 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1459 NOT_LP64(ShouldNotReachHere(); return 0); 1460 } 1461 1462 bool Arguments::should_auto_select_low_pause_collector() { 1463 if (UseAutoGCSelectPolicy && 1464 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1465 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1466 if (PrintGCDetails) { 1467 // Cannot use gclog_or_tty yet. 1468 tty->print_cr("Automatic selection of the low pause collector" 1469 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1470 } 1471 return true; 1472 } 1473 return false; 1474 } 1475 1476 void Arguments::set_use_compressed_oops() { 1477 #ifndef ZERO 1478 #ifdef _LP64 1479 // MaxHeapSize is not set up properly at this point, but 1480 // the only value that can override MaxHeapSize if we are 1481 // to use UseCompressedOops is InitialHeapSize. 1482 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1483 1484 if (max_heap_size <= max_heap_for_compressed_oops()) { 1485 #if !defined(COMPILER1) || defined(TIERED) 1486 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1487 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1488 } 1489 #endif 1490 #ifdef _WIN64 1491 if (UseLargePages && UseCompressedOops) { 1492 // Cannot allocate guard pages for implicit checks in indexed addressing 1493 // mode, when large pages are specified on windows. 1494 // This flag could be switched ON if narrow oop base address is set to 0, 1495 // see code in Universe::initialize_heap(). 1496 Universe::set_narrow_oop_use_implicit_null_checks(false); 1497 } 1498 #endif // _WIN64 1499 } else { 1500 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1501 warning("Max heap size too large for Compressed Oops"); 1502 FLAG_SET_DEFAULT(UseCompressedOops, false); 1503 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1504 } 1505 } 1506 #endif // _LP64 1507 #endif // ZERO 1508 } 1509 1510 1511 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1512 // set_use_compressed_oops(). 1513 void Arguments::set_use_compressed_klass_ptrs() { 1514 #ifndef ZERO 1515 #ifdef _LP64 1516 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1517 if (!UseCompressedOops) { 1518 if (UseCompressedClassPointers) { 1519 warning("UseCompressedClassPointers requires UseCompressedOops"); 1520 } 1521 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1522 } else { 1523 // Turn on UseCompressedClassPointers too 1524 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1525 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1526 } 1527 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1528 if (UseCompressedClassPointers) { 1529 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1530 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1531 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1532 } 1533 } 1534 } 1535 #endif // _LP64 1536 #endif // !ZERO 1537 } 1538 1539 void Arguments::set_conservative_max_heap_alignment() { 1540 // The conservative maximum required alignment for the heap is the maximum of 1541 // the alignments imposed by several sources: any requirements from the heap 1542 // itself, the collector policy and the maximum page size we may run the VM 1543 // with. 1544 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1545 #if INCLUDE_ALL_GCS 1546 if (UseParallelGC) { 1547 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1548 } else if (UseG1GC) { 1549 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1550 } 1551 #endif // INCLUDE_ALL_GCS 1552 _conservative_max_heap_alignment = MAX4(heap_alignment, 1553 (size_t)os::vm_allocation_granularity(), 1554 os::max_page_size(), 1555 CollectorPolicy::compute_heap_alignment()); 1556 } 1557 1558 void Arguments::set_ergonomics_flags() { 1559 1560 if (os::is_server_class_machine()) { 1561 // If no other collector is requested explicitly, 1562 // let the VM select the collector based on 1563 // machine class and automatic selection policy. 1564 if (!UseSerialGC && 1565 !UseConcMarkSweepGC && 1566 !UseG1GC && 1567 !UseParNewGC && 1568 FLAG_IS_DEFAULT(UseParallelGC)) { 1569 if (should_auto_select_low_pause_collector()) { 1570 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1571 } else { 1572 FLAG_SET_ERGO(bool, UseParallelGC, true); 1573 } 1574 } 1575 } 1576 #ifdef COMPILER2 1577 // Shared spaces work fine with other GCs but causes bytecode rewriting 1578 // to be disabled, which hurts interpreter performance and decreases 1579 // server performance. When -server is specified, keep the default off 1580 // unless it is asked for. Future work: either add bytecode rewriting 1581 // at link time, or rewrite bytecodes in non-shared methods. 1582 if (!DumpSharedSpaces && !RequireSharedSpaces && 1583 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1584 no_shared_spaces(); 1585 } 1586 #endif 1587 1588 set_conservative_max_heap_alignment(); 1589 1590 #ifndef ZERO 1591 #ifdef _LP64 1592 set_use_compressed_oops(); 1593 1594 // set_use_compressed_klass_ptrs() must be called after calling 1595 // set_use_compressed_oops(). 1596 set_use_compressed_klass_ptrs(); 1597 1598 // Also checks that certain machines are slower with compressed oops 1599 // in vm_version initialization code. 1600 #endif // _LP64 1601 #endif // !ZERO 1602 } 1603 1604 void Arguments::set_parallel_gc_flags() { 1605 assert(UseParallelGC || UseParallelOldGC, "Error"); 1606 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1607 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1608 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1609 } 1610 FLAG_SET_DEFAULT(UseParallelGC, true); 1611 1612 // If no heap maximum was requested explicitly, use some reasonable fraction 1613 // of the physical memory, up to a maximum of 1GB. 1614 FLAG_SET_DEFAULT(ParallelGCThreads, 1615 Abstract_VM_Version::parallel_worker_threads()); 1616 if (ParallelGCThreads == 0) { 1617 jio_fprintf(defaultStream::error_stream(), 1618 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1619 vm_exit(1); 1620 } 1621 1622 if (UseAdaptiveSizePolicy) { 1623 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1624 // unless the user actually sets these flags. 1625 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1626 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1627 } 1628 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1629 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1630 } 1631 } 1632 1633 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1634 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1635 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1636 // See CR 6362902 for details. 1637 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1638 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1639 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1640 } 1641 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1642 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1643 } 1644 } 1645 1646 if (UseParallelOldGC) { 1647 // Par compact uses lower default values since they are treated as 1648 // minimums. These are different defaults because of the different 1649 // interpretation and are not ergonomically set. 1650 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1651 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1652 } 1653 } 1654 } 1655 1656 void Arguments::set_g1_gc_flags() { 1657 assert(UseG1GC, "Error"); 1658 #ifdef COMPILER1 1659 FastTLABRefill = false; 1660 #endif 1661 FLAG_SET_DEFAULT(ParallelGCThreads, 1662 Abstract_VM_Version::parallel_worker_threads()); 1663 if (ParallelGCThreads == 0) { 1664 FLAG_SET_DEFAULT(ParallelGCThreads, 1665 Abstract_VM_Version::parallel_worker_threads()); 1666 } 1667 1668 // MarkStackSize will be set (if it hasn't been set by the user) 1669 // when concurrent marking is initialized. 1670 // Its value will be based upon the number of parallel marking threads. 1671 // But we do set the maximum mark stack size here. 1672 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1673 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1674 } 1675 1676 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1677 // In G1, we want the default GC overhead goal to be higher than 1678 // say in PS. So we set it here to 10%. Otherwise the heap might 1679 // be expanded more aggressively than we would like it to. In 1680 // fact, even 10% seems to not be high enough in some cases 1681 // (especially small GC stress tests that the main thing they do 1682 // is allocation). We might consider increase it further. 1683 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1684 } 1685 1686 if (PrintGCDetails && Verbose) { 1687 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1688 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1689 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1690 } 1691 } 1692 1693 julong Arguments::limit_by_allocatable_memory(julong limit) { 1694 julong max_allocatable; 1695 julong result = limit; 1696 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1697 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1698 } 1699 return result; 1700 } 1701 1702 // Use static initialization to get the default before parsing 1703 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1704 1705 void Arguments::set_heap_size() { 1706 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1707 // Deprecated flag 1708 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1709 } 1710 1711 const julong phys_mem = 1712 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1713 : (julong)MaxRAM; 1714 1715 // If the maximum heap size has not been set with -Xmx, 1716 // then set it as fraction of the size of physical memory, 1717 // respecting the maximum and minimum sizes of the heap. 1718 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1719 julong reasonable_max = phys_mem / MaxRAMFraction; 1720 1721 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1722 // Small physical memory, so use a minimum fraction of it for the heap 1723 reasonable_max = phys_mem / MinRAMFraction; 1724 } else { 1725 // Not-small physical memory, so require a heap at least 1726 // as large as MaxHeapSize 1727 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1728 } 1729 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1730 // Limit the heap size to ErgoHeapSizeLimit 1731 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1732 } 1733 if (UseCompressedOops) { 1734 // Limit the heap size to the maximum possible when using compressed oops 1735 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1736 1737 // HeapBaseMinAddress can be greater than default but not less than. 1738 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1739 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1740 // matches compressed oops printing flags 1741 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1742 jio_fprintf(defaultStream::error_stream(), 1743 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1744 " (" UINTX_FORMAT "G) which is greater than value given " 1745 UINTX_FORMAT "\n", 1746 DefaultHeapBaseMinAddress, 1747 DefaultHeapBaseMinAddress/G, 1748 HeapBaseMinAddress); 1749 } 1750 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1751 } 1752 } 1753 1754 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1755 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1756 // but it should be not less than default MaxHeapSize. 1757 max_coop_heap -= HeapBaseMinAddress; 1758 } 1759 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1760 } 1761 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1762 1763 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1764 // An initial heap size was specified on the command line, 1765 // so be sure that the maximum size is consistent. Done 1766 // after call to limit_by_allocatable_memory because that 1767 // method might reduce the allocation size. 1768 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1769 } 1770 1771 if (PrintGCDetails && Verbose) { 1772 // Cannot use gclog_or_tty yet. 1773 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1774 } 1775 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1776 } 1777 1778 // If the minimum or initial heap_size have not been set or requested to be set 1779 // ergonomically, set them accordingly. 1780 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1781 julong reasonable_minimum = (julong)(OldSize + NewSize); 1782 1783 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1784 1785 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1786 1787 if (InitialHeapSize == 0) { 1788 julong reasonable_initial = phys_mem / InitialRAMFraction; 1789 1790 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1791 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1792 1793 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1794 1795 if (PrintGCDetails && Verbose) { 1796 // Cannot use gclog_or_tty yet. 1797 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1798 } 1799 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1800 } 1801 // If the minimum heap size has not been set (via -Xms), 1802 // synchronize with InitialHeapSize to avoid errors with the default value. 1803 if (min_heap_size() == 0) { 1804 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1805 if (PrintGCDetails && Verbose) { 1806 // Cannot use gclog_or_tty yet. 1807 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1808 } 1809 } 1810 } 1811 } 1812 1813 // This must be called after ergonomics because we want bytecode rewriting 1814 // if the server compiler is used, or if UseSharedSpaces is disabled. 1815 void Arguments::set_bytecode_flags() { 1816 // Better not attempt to store into a read-only space. 1817 if (UseSharedSpaces) { 1818 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1819 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1820 } 1821 1822 if (!RewriteBytecodes) { 1823 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1824 } 1825 } 1826 1827 // Aggressive optimization flags -XX:+AggressiveOpts 1828 void Arguments::set_aggressive_opts_flags() { 1829 #ifdef COMPILER2 1830 if (AggressiveUnboxing) { 1831 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1832 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1833 } else if (!EliminateAutoBox) { 1834 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1835 AggressiveUnboxing = false; 1836 } 1837 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1838 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1839 } else if (!DoEscapeAnalysis) { 1840 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1841 AggressiveUnboxing = false; 1842 } 1843 } 1844 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1845 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1846 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1847 } 1848 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1849 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1850 } 1851 1852 // Feed the cache size setting into the JDK 1853 char buffer[1024]; 1854 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1855 add_property(buffer); 1856 } 1857 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1858 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1859 } 1860 #endif 1861 1862 if (AggressiveOpts) { 1863 // Sample flag setting code 1864 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1865 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1866 // } 1867 } 1868 } 1869 1870 //=========================================================================================================== 1871 // Parsing of java.compiler property 1872 1873 void Arguments::process_java_compiler_argument(char* arg) { 1874 // For backwards compatibility, Djava.compiler=NONE or "" 1875 // causes us to switch to -Xint mode UNLESS -Xdebug 1876 // is also specified. 1877 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1878 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1879 } 1880 } 1881 1882 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1883 _sun_java_launcher = os::strdup_check_oom(launcher); 1884 } 1885 1886 bool Arguments::created_by_java_launcher() { 1887 assert(_sun_java_launcher != NULL, "property must have value"); 1888 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1889 } 1890 1891 bool Arguments::sun_java_launcher_is_altjvm() { 1892 return _sun_java_launcher_is_altjvm; 1893 } 1894 1895 //=========================================================================================================== 1896 // Parsing of main arguments 1897 1898 bool Arguments::verify_interval(uintx val, uintx min, 1899 uintx max, const char* name) { 1900 // Returns true iff value is in the inclusive interval [min..max] 1901 // false, otherwise. 1902 if (val >= min && val <= max) { 1903 return true; 1904 } 1905 jio_fprintf(defaultStream::error_stream(), 1906 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1907 " and " UINTX_FORMAT "\n", 1908 name, val, min, max); 1909 return false; 1910 } 1911 1912 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1913 // Returns true if given value is at least specified min threshold 1914 // false, otherwise. 1915 if (val >= min ) { 1916 return true; 1917 } 1918 jio_fprintf(defaultStream::error_stream(), 1919 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1920 name, val, min); 1921 return false; 1922 } 1923 1924 bool Arguments::verify_percentage(uintx value, const char* name) { 1925 if (is_percentage(value)) { 1926 return true; 1927 } 1928 jio_fprintf(defaultStream::error_stream(), 1929 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1930 name, value); 1931 return false; 1932 } 1933 1934 #if !INCLUDE_ALL_GCS 1935 #ifdef ASSERT 1936 static bool verify_serial_gc_flags() { 1937 return (UseSerialGC && 1938 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1939 UseParallelGC || UseParallelOldGC)); 1940 } 1941 #endif // ASSERT 1942 #endif // INCLUDE_ALL_GCS 1943 1944 // check if do gclog rotation 1945 // +UseGCLogFileRotation is a must, 1946 // no gc log rotation when log file not supplied or 1947 // NumberOfGCLogFiles is 0 1948 void check_gclog_consistency() { 1949 if (UseGCLogFileRotation) { 1950 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1951 jio_fprintf(defaultStream::output_stream(), 1952 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1953 "where num_of_file > 0\n" 1954 "GC log rotation is turned off\n"); 1955 UseGCLogFileRotation = false; 1956 } 1957 } 1958 1959 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1960 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1961 jio_fprintf(defaultStream::output_stream(), 1962 "GCLogFileSize changed to minimum 8K\n"); 1963 } 1964 } 1965 1966 // This function is called for -Xloggc:<filename>, it can be used 1967 // to check if a given file name(or string) conforms to the following 1968 // specification: 1969 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1970 // %p and %t only allowed once. We only limit usage of filename not path 1971 bool is_filename_valid(const char *file_name) { 1972 const char* p = file_name; 1973 char file_sep = os::file_separator()[0]; 1974 const char* cp; 1975 // skip prefix path 1976 for (cp = file_name; *cp != '\0'; cp++) { 1977 if (*cp == '/' || *cp == file_sep) { 1978 p = cp + 1; 1979 } 1980 } 1981 1982 int count_p = 0; 1983 int count_t = 0; 1984 while (*p != '\0') { 1985 if ((*p >= '0' && *p <= '9') || 1986 (*p >= 'A' && *p <= 'Z') || 1987 (*p >= 'a' && *p <= 'z') || 1988 *p == '-' || 1989 *p == '_' || 1990 *p == '.') { 1991 p++; 1992 continue; 1993 } 1994 if (*p == '%') { 1995 if(*(p + 1) == 'p') { 1996 p += 2; 1997 count_p ++; 1998 continue; 1999 } 2000 if (*(p + 1) == 't') { 2001 p += 2; 2002 count_t ++; 2003 continue; 2004 } 2005 } 2006 return false; 2007 } 2008 return count_p < 2 && count_t < 2; 2009 } 2010 2011 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2012 if (!is_percentage(min_heap_free_ratio)) { 2013 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2014 return false; 2015 } 2016 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2017 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2018 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2019 MaxHeapFreeRatio); 2020 return false; 2021 } 2022 return true; 2023 } 2024 2025 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2026 if (!is_percentage(max_heap_free_ratio)) { 2027 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2028 return false; 2029 } 2030 if (max_heap_free_ratio < MinHeapFreeRatio) { 2031 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2032 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2033 MinHeapFreeRatio); 2034 return false; 2035 } 2036 return true; 2037 } 2038 2039 // Check consistency of GC selection 2040 bool Arguments::check_gc_consistency() { 2041 check_gclog_consistency(); 2042 bool status = true; 2043 // Ensure that the user has not selected conflicting sets 2044 // of collectors. [Note: this check is merely a user convenience; 2045 // collectors over-ride each other so that only a non-conflicting 2046 // set is selected; however what the user gets is not what they 2047 // may have expected from the combination they asked for. It's 2048 // better to reduce user confusion by not allowing them to 2049 // select conflicting combinations. 2050 uint i = 0; 2051 if (UseSerialGC) i++; 2052 if (UseConcMarkSweepGC || UseParNewGC) i++; 2053 if (UseParallelGC || UseParallelOldGC) i++; 2054 if (UseG1GC) i++; 2055 if (i > 1) { 2056 jio_fprintf(defaultStream::error_stream(), 2057 "Conflicting collector combinations in option list; " 2058 "please refer to the release notes for the combinations " 2059 "allowed\n"); 2060 status = false; 2061 } 2062 return status; 2063 } 2064 2065 void Arguments::check_deprecated_gcs() { 2066 if (UseConcMarkSweepGC && !UseParNewGC) { 2067 warning("Using the DefNew young collector with the CMS collector is deprecated " 2068 "and will likely be removed in a future release"); 2069 } 2070 2071 if (UseParNewGC && !UseConcMarkSweepGC) { 2072 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2073 // set up UseSerialGC properly, so that can't be used in the check here. 2074 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2075 "and will likely be removed in a future release"); 2076 } 2077 2078 if (CMSIncrementalMode) { 2079 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2080 } 2081 } 2082 2083 void Arguments::check_deprecated_gc_flags() { 2084 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2085 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2086 "and will likely be removed in future release"); 2087 } 2088 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2089 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2090 "Use MaxRAMFraction instead."); 2091 } 2092 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2093 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2094 } 2095 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2096 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2097 } 2098 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2099 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2100 } 2101 } 2102 2103 // Check stack pages settings 2104 bool Arguments::check_stack_pages() 2105 { 2106 bool status = true; 2107 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2108 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2109 // greater stack shadow pages can't generate instruction to bang stack 2110 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2111 return status; 2112 } 2113 2114 // Check the consistency of vm_init_args 2115 bool Arguments::check_vm_args_consistency() { 2116 // Method for adding checks for flag consistency. 2117 // The intent is to warn the user of all possible conflicts, 2118 // before returning an error. 2119 // Note: Needs platform-dependent factoring. 2120 bool status = true; 2121 2122 if (TLABRefillWasteFraction == 0) { 2123 jio_fprintf(defaultStream::error_stream(), 2124 "TLABRefillWasteFraction should be a denominator, " 2125 "not " SIZE_FORMAT "\n", 2126 TLABRefillWasteFraction); 2127 status = false; 2128 } 2129 2130 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2131 "AdaptiveSizePolicyWeight"); 2132 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2133 2134 // Divide by bucket size to prevent a large size from causing rollover when 2135 // calculating amount of memory needed to be allocated for the String table. 2136 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2137 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2138 2139 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2140 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2141 2142 { 2143 // Using "else if" below to avoid printing two error messages if min > max. 2144 // This will also prevent us from reporting both min>100 and max>100 at the 2145 // same time, but that is less annoying than printing two identical errors IMHO. 2146 FormatBuffer<80> err_msg("%s",""); 2147 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2148 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2149 status = false; 2150 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2151 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2152 status = false; 2153 } 2154 } 2155 2156 // Min/MaxMetaspaceFreeRatio 2157 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2158 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2159 2160 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2161 jio_fprintf(defaultStream::error_stream(), 2162 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2163 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2164 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2165 MinMetaspaceFreeRatio, 2166 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2167 MaxMetaspaceFreeRatio); 2168 status = false; 2169 } 2170 2171 // Trying to keep 100% free is not practical 2172 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2173 2174 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2175 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2176 } 2177 2178 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2179 // Settings to encourage splitting. 2180 if (!FLAG_IS_CMDLINE(NewRatio)) { 2181 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2182 } 2183 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2184 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2185 } 2186 } 2187 2188 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2189 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2190 } 2191 2192 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2193 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2194 if (GCTimeLimit == 100) { 2195 // Turn off gc-overhead-limit-exceeded checks 2196 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2197 } 2198 2199 status = status && check_gc_consistency(); 2200 status = status && check_stack_pages(); 2201 2202 if (CMSIncrementalMode) { 2203 if (!UseConcMarkSweepGC) { 2204 jio_fprintf(defaultStream::error_stream(), 2205 "error: invalid argument combination.\n" 2206 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2207 "selected in order\nto use CMSIncrementalMode.\n"); 2208 status = false; 2209 } else { 2210 status = status && verify_percentage(CMSIncrementalDutyCycle, 2211 "CMSIncrementalDutyCycle"); 2212 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2213 "CMSIncrementalDutyCycleMin"); 2214 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2215 "CMSIncrementalSafetyFactor"); 2216 status = status && verify_percentage(CMSIncrementalOffset, 2217 "CMSIncrementalOffset"); 2218 status = status && verify_percentage(CMSExpAvgFactor, 2219 "CMSExpAvgFactor"); 2220 // If it was not set on the command line, set 2221 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2222 if (CMSInitiatingOccupancyFraction < 0) { 2223 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2224 } 2225 } 2226 } 2227 2228 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2229 // insists that we hold the requisite locks so that the iteration is 2230 // MT-safe. For the verification at start-up and shut-down, we don't 2231 // yet have a good way of acquiring and releasing these locks, 2232 // which are not visible at the CollectedHeap level. We want to 2233 // be able to acquire these locks and then do the iteration rather 2234 // than just disable the lock verification. This will be fixed under 2235 // bug 4788986. 2236 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2237 if (VerifyDuringStartup) { 2238 warning("Heap verification at start-up disabled " 2239 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2240 VerifyDuringStartup = false; // Disable verification at start-up 2241 } 2242 2243 if (VerifyBeforeExit) { 2244 warning("Heap verification at shutdown disabled " 2245 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2246 VerifyBeforeExit = false; // Disable verification at shutdown 2247 } 2248 } 2249 2250 // Note: only executed in non-PRODUCT mode 2251 if (!UseAsyncConcMarkSweepGC && 2252 (ExplicitGCInvokesConcurrent || 2253 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2254 jio_fprintf(defaultStream::error_stream(), 2255 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2256 " with -UseAsyncConcMarkSweepGC"); 2257 status = false; 2258 } 2259 2260 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2261 2262 #if INCLUDE_ALL_GCS 2263 if (UseG1GC) { 2264 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2265 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2266 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2267 2268 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2269 "InitiatingHeapOccupancyPercent"); 2270 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2271 "G1RefProcDrainInterval"); 2272 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2273 "G1ConcMarkStepDurationMillis"); 2274 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2275 "G1ConcRSHotCardLimit"); 2276 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2277 "G1ConcRSLogCacheSize"); 2278 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2279 "StringDeduplicationAgeThreshold"); 2280 } 2281 if (UseConcMarkSweepGC) { 2282 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2283 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2284 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2285 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2286 2287 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2288 2289 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2290 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2291 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2292 2293 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2294 2295 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2296 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2297 2298 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2299 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2300 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2301 2302 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2303 2304 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2305 2306 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2307 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2308 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2309 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2310 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2311 } 2312 2313 if (UseParallelGC || UseParallelOldGC) { 2314 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2315 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2316 2317 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2318 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2319 2320 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2321 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2322 2323 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2324 2325 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2326 } 2327 #endif // INCLUDE_ALL_GCS 2328 2329 status = status && verify_interval(RefDiscoveryPolicy, 2330 ReferenceProcessor::DiscoveryPolicyMin, 2331 ReferenceProcessor::DiscoveryPolicyMax, 2332 "RefDiscoveryPolicy"); 2333 2334 // Limit the lower bound of this flag to 1 as it is used in a division 2335 // expression. 2336 status = status && verify_interval(TLABWasteTargetPercent, 2337 1, 100, "TLABWasteTargetPercent"); 2338 2339 status = status && verify_object_alignment(); 2340 2341 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2342 "CompressedClassSpaceSize"); 2343 2344 status = status && verify_interval(MarkStackSizeMax, 2345 1, (max_jint - 1), "MarkStackSizeMax"); 2346 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2347 2348 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2349 2350 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2351 2352 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2353 2354 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2355 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2356 2357 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2358 2359 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2360 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2361 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2362 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2363 2364 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2365 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2366 2367 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2368 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2369 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2370 2371 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2372 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2373 2374 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2375 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2376 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2377 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2378 2379 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2380 #ifdef COMPILER1 2381 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2382 #endif 2383 2384 if (PrintNMTStatistics) { 2385 #if INCLUDE_NMT 2386 if (MemTracker::tracking_level() == NMT_off) { 2387 #endif // INCLUDE_NMT 2388 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2389 PrintNMTStatistics = false; 2390 #if INCLUDE_NMT 2391 } 2392 #endif 2393 } 2394 2395 // Need to limit the extent of the padding to reasonable size. 2396 // 8K is well beyond the reasonable HW cache line size, even with the 2397 // aggressive prefetching, while still leaving the room for segregating 2398 // among the distinct pages. 2399 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2400 jio_fprintf(defaultStream::error_stream(), 2401 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2402 ContendedPaddingWidth, 0, 8192); 2403 status = false; 2404 } 2405 2406 // Need to enforce the padding not to break the existing field alignments. 2407 // It is sufficient to check against the largest type size. 2408 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2409 jio_fprintf(defaultStream::error_stream(), 2410 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2411 ContendedPaddingWidth, BytesPerLong); 2412 status = false; 2413 } 2414 2415 // Check lower bounds of the code cache 2416 // Template Interpreter code is approximately 3X larger in debug builds. 2417 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2418 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2419 jio_fprintf(defaultStream::error_stream(), 2420 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2421 os::vm_page_size()/K); 2422 status = false; 2423 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2424 jio_fprintf(defaultStream::error_stream(), 2425 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2426 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2427 status = false; 2428 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2429 jio_fprintf(defaultStream::error_stream(), 2430 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2431 min_code_cache_size/K); 2432 status = false; 2433 } else if (ReservedCodeCacheSize > 2*G) { 2434 // Code cache size larger than MAXINT is not supported. 2435 jio_fprintf(defaultStream::error_stream(), 2436 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2437 (2*G)/M); 2438 status = false; 2439 } 2440 2441 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2442 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2443 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2444 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2445 2446 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2447 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2448 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2449 // Check the minimum number of compiler threads 2450 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2451 2452 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2453 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2454 } 2455 2456 status &= check_vm_args_consistency_ext(); 2457 2458 return status; 2459 } 2460 2461 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2462 const char* option_type) { 2463 if (ignore) return false; 2464 2465 const char* spacer = " "; 2466 if (option_type == NULL) { 2467 option_type = ++spacer; // Set both to the empty string. 2468 } 2469 2470 if (os::obsolete_option(option)) { 2471 jio_fprintf(defaultStream::error_stream(), 2472 "Obsolete %s%soption: %s\n", option_type, spacer, 2473 option->optionString); 2474 return false; 2475 } else { 2476 jio_fprintf(defaultStream::error_stream(), 2477 "Unrecognized %s%soption: %s\n", option_type, spacer, 2478 option->optionString); 2479 return true; 2480 } 2481 } 2482 2483 static const char* user_assertion_options[] = { 2484 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2485 }; 2486 2487 static const char* system_assertion_options[] = { 2488 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2489 }; 2490 2491 // Return true if any of the strings in null-terminated array 'names' matches. 2492 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2493 // the option must match exactly. 2494 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2495 bool tail_allowed) { 2496 for (/* empty */; *names != NULL; ++names) { 2497 if (match_option(option, *names, tail)) { 2498 if (**tail == '\0' || tail_allowed && **tail == ':') { 2499 return true; 2500 } 2501 } 2502 } 2503 return false; 2504 } 2505 2506 bool Arguments::parse_uintx(const char* value, 2507 uintx* uintx_arg, 2508 uintx min_size) { 2509 2510 // Check the sign first since atomull() parses only unsigned values. 2511 bool value_is_positive = !(*value == '-'); 2512 2513 if (value_is_positive) { 2514 julong n; 2515 bool good_return = atomull(value, &n); 2516 if (good_return) { 2517 bool above_minimum = n >= min_size; 2518 bool value_is_too_large = n > max_uintx; 2519 2520 if (above_minimum && !value_is_too_large) { 2521 *uintx_arg = n; 2522 return true; 2523 } 2524 } 2525 } 2526 return false; 2527 } 2528 2529 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2530 julong* long_arg, 2531 julong min_size) { 2532 if (!atomull(s, long_arg)) return arg_unreadable; 2533 return check_memory_size(*long_arg, min_size); 2534 } 2535 2536 // Parse JavaVMInitArgs structure 2537 2538 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2539 // For components of the system classpath. 2540 SysClassPath scp(Arguments::get_sysclasspath()); 2541 bool scp_assembly_required = false; 2542 2543 // Save default settings for some mode flags 2544 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2545 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2546 Arguments::_ClipInlining = ClipInlining; 2547 Arguments::_BackgroundCompilation = BackgroundCompilation; 2548 2549 // Setup flags for mixed which is the default 2550 set_mode_flags(_mixed); 2551 2552 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2553 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2554 if (result != JNI_OK) { 2555 return result; 2556 } 2557 2558 // Parse JavaVMInitArgs structure passed in 2559 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2560 if (result != JNI_OK) { 2561 return result; 2562 } 2563 2564 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2565 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2566 if (result != JNI_OK) { 2567 return result; 2568 } 2569 2570 // Do final processing now that all arguments have been parsed 2571 result = finalize_vm_init_args(&scp, scp_assembly_required); 2572 if (result != JNI_OK) { 2573 return result; 2574 } 2575 2576 return JNI_OK; 2577 } 2578 2579 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2580 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2581 // are dealing with -agentpath (case where name is a path), otherwise with 2582 // -agentlib 2583 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2584 char *_name; 2585 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2586 size_t _len_hprof, _len_jdwp, _len_prefix; 2587 2588 if (is_path) { 2589 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2590 return false; 2591 } 2592 2593 _name++; // skip past last path separator 2594 _len_prefix = strlen(JNI_LIB_PREFIX); 2595 2596 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2597 return false; 2598 } 2599 2600 _name += _len_prefix; 2601 _len_hprof = strlen(_hprof); 2602 _len_jdwp = strlen(_jdwp); 2603 2604 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2605 _name += _len_hprof; 2606 } 2607 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2608 _name += _len_jdwp; 2609 } 2610 else { 2611 return false; 2612 } 2613 2614 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2615 return false; 2616 } 2617 2618 return true; 2619 } 2620 2621 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2622 return true; 2623 } 2624 2625 return false; 2626 } 2627 2628 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2629 SysClassPath* scp_p, 2630 bool* scp_assembly_required_p, 2631 Flag::Flags origin) { 2632 // Remaining part of option string 2633 const char* tail; 2634 2635 // iterate over arguments 2636 for (int index = 0; index < args->nOptions; index++) { 2637 bool is_absolute_path = false; // for -agentpath vs -agentlib 2638 2639 const JavaVMOption* option = args->options + index; 2640 2641 if (!match_option(option, "-Djava.class.path", &tail) && 2642 !match_option(option, "-Dsun.java.command", &tail) && 2643 !match_option(option, "-Dsun.java.launcher", &tail)) { 2644 2645 // add all jvm options to the jvm_args string. This string 2646 // is used later to set the java.vm.args PerfData string constant. 2647 // the -Djava.class.path and the -Dsun.java.command options are 2648 // omitted from jvm_args string as each have their own PerfData 2649 // string constant object. 2650 build_jvm_args(option->optionString); 2651 } 2652 2653 // -verbose:[class/gc/jni] 2654 if (match_option(option, "-verbose", &tail)) { 2655 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2656 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2657 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2658 } else if (!strcmp(tail, ":gc")) { 2659 FLAG_SET_CMDLINE(bool, PrintGC, true); 2660 } else if (!strcmp(tail, ":jni")) { 2661 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2662 } 2663 // -da / -ea / -disableassertions / -enableassertions 2664 // These accept an optional class/package name separated by a colon, e.g., 2665 // -da:java.lang.Thread. 2666 } else if (match_option(option, user_assertion_options, &tail, true)) { 2667 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2668 if (*tail == '\0') { 2669 JavaAssertions::setUserClassDefault(enable); 2670 } else { 2671 assert(*tail == ':', "bogus match by match_option()"); 2672 JavaAssertions::addOption(tail + 1, enable); 2673 } 2674 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2675 } else if (match_option(option, system_assertion_options, &tail, false)) { 2676 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2677 JavaAssertions::setSystemClassDefault(enable); 2678 // -bootclasspath: 2679 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2680 scp_p->reset_path(tail); 2681 *scp_assembly_required_p = true; 2682 // -bootclasspath/a: 2683 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2684 scp_p->add_suffix(tail); 2685 *scp_assembly_required_p = true; 2686 // -bootclasspath/p: 2687 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2688 scp_p->add_prefix(tail); 2689 *scp_assembly_required_p = true; 2690 // -Xrun 2691 } else if (match_option(option, "-Xrun", &tail)) { 2692 if (tail != NULL) { 2693 const char* pos = strchr(tail, ':'); 2694 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2695 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2696 name[len] = '\0'; 2697 2698 char *options = NULL; 2699 if(pos != NULL) { 2700 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2701 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2702 } 2703 #if !INCLUDE_JVMTI 2704 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2705 jio_fprintf(defaultStream::error_stream(), 2706 "Profiling and debugging agents are not supported in this VM\n"); 2707 return JNI_ERR; 2708 } 2709 #endif // !INCLUDE_JVMTI 2710 add_init_library(name, options); 2711 } 2712 // -agentlib and -agentpath 2713 } else if (match_option(option, "-agentlib:", &tail) || 2714 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2715 if(tail != NULL) { 2716 const char* pos = strchr(tail, '='); 2717 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2718 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2719 name[len] = '\0'; 2720 2721 char *options = NULL; 2722 if(pos != NULL) { 2723 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2724 } 2725 #if !INCLUDE_JVMTI 2726 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2727 jio_fprintf(defaultStream::error_stream(), 2728 "Profiling and debugging agents are not supported in this VM\n"); 2729 return JNI_ERR; 2730 } 2731 #endif // !INCLUDE_JVMTI 2732 add_init_agent(name, options, is_absolute_path); 2733 } 2734 // -javaagent 2735 } else if (match_option(option, "-javaagent:", &tail)) { 2736 #if !INCLUDE_JVMTI 2737 jio_fprintf(defaultStream::error_stream(), 2738 "Instrumentation agents are not supported in this VM\n"); 2739 return JNI_ERR; 2740 #else 2741 if(tail != NULL) { 2742 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2743 add_init_agent("instrument", options, false); 2744 } 2745 #endif // !INCLUDE_JVMTI 2746 // -Xnoclassgc 2747 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2748 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2749 // -Xincgc: i-CMS 2750 } else if (match_option(option, "-Xincgc", &tail)) { 2751 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2752 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2753 // -Xnoincgc: no i-CMS 2754 } else if (match_option(option, "-Xnoincgc", &tail)) { 2755 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2756 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2757 // -Xconcgc 2758 } else if (match_option(option, "-Xconcgc", &tail)) { 2759 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2760 // -Xnoconcgc 2761 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2762 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2763 // -Xbatch 2764 } else if (match_option(option, "-Xbatch", &tail)) { 2765 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2766 // -Xmn for compatibility with other JVM vendors 2767 } else if (match_option(option, "-Xmn", &tail)) { 2768 julong long_initial_young_size = 0; 2769 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2770 if (errcode != arg_in_range) { 2771 jio_fprintf(defaultStream::error_stream(), 2772 "Invalid initial young generation size: %s\n", option->optionString); 2773 describe_range_error(errcode); 2774 return JNI_EINVAL; 2775 } 2776 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2777 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2778 // -Xms 2779 } else if (match_option(option, "-Xms", &tail)) { 2780 julong long_initial_heap_size = 0; 2781 // an initial heap size of 0 means automatically determine 2782 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2783 if (errcode != arg_in_range) { 2784 jio_fprintf(defaultStream::error_stream(), 2785 "Invalid initial heap size: %s\n", option->optionString); 2786 describe_range_error(errcode); 2787 return JNI_EINVAL; 2788 } 2789 set_min_heap_size((uintx)long_initial_heap_size); 2790 // Currently the minimum size and the initial heap sizes are the same. 2791 // Can be overridden with -XX:InitialHeapSize. 2792 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2793 // -Xmx 2794 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2795 julong long_max_heap_size = 0; 2796 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2797 if (errcode != arg_in_range) { 2798 jio_fprintf(defaultStream::error_stream(), 2799 "Invalid maximum heap size: %s\n", option->optionString); 2800 describe_range_error(errcode); 2801 return JNI_EINVAL; 2802 } 2803 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2804 // Xmaxf 2805 } else if (match_option(option, "-Xmaxf", &tail)) { 2806 char* err; 2807 int maxf = (int)(strtod(tail, &err) * 100); 2808 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2809 jio_fprintf(defaultStream::error_stream(), 2810 "Bad max heap free percentage size: %s\n", 2811 option->optionString); 2812 return JNI_EINVAL; 2813 } else { 2814 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2815 } 2816 // Xminf 2817 } else if (match_option(option, "-Xminf", &tail)) { 2818 char* err; 2819 int minf = (int)(strtod(tail, &err) * 100); 2820 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2821 jio_fprintf(defaultStream::error_stream(), 2822 "Bad min heap free percentage size: %s\n", 2823 option->optionString); 2824 return JNI_EINVAL; 2825 } else { 2826 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2827 } 2828 // -Xss 2829 } else if (match_option(option, "-Xss", &tail)) { 2830 julong long_ThreadStackSize = 0; 2831 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2832 if (errcode != arg_in_range) { 2833 jio_fprintf(defaultStream::error_stream(), 2834 "Invalid thread stack size: %s\n", option->optionString); 2835 describe_range_error(errcode); 2836 return JNI_EINVAL; 2837 } 2838 // Internally track ThreadStackSize in units of 1024 bytes. 2839 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2840 round_to((int)long_ThreadStackSize, K) / K); 2841 // -Xoss 2842 } else if (match_option(option, "-Xoss", &tail)) { 2843 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2844 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2845 julong long_CodeCacheExpansionSize = 0; 2846 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2847 if (errcode != arg_in_range) { 2848 jio_fprintf(defaultStream::error_stream(), 2849 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2850 os::vm_page_size()/K); 2851 return JNI_EINVAL; 2852 } 2853 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2854 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2855 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2856 julong long_ReservedCodeCacheSize = 0; 2857 2858 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2859 if (errcode != arg_in_range) { 2860 jio_fprintf(defaultStream::error_stream(), 2861 "Invalid maximum code cache size: %s.\n", option->optionString); 2862 return JNI_EINVAL; 2863 } 2864 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2865 //-XX:IncreaseFirstTierCompileThresholdAt= 2866 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2867 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2868 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2869 jio_fprintf(defaultStream::error_stream(), 2870 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2871 option->optionString); 2872 return JNI_EINVAL; 2873 } 2874 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2875 // -green 2876 } else if (match_option(option, "-green", &tail)) { 2877 jio_fprintf(defaultStream::error_stream(), 2878 "Green threads support not available\n"); 2879 return JNI_EINVAL; 2880 // -native 2881 } else if (match_option(option, "-native", &tail)) { 2882 // HotSpot always uses native threads, ignore silently for compatibility 2883 // -Xsqnopause 2884 } else if (match_option(option, "-Xsqnopause", &tail)) { 2885 // EVM option, ignore silently for compatibility 2886 // -Xrs 2887 } else if (match_option(option, "-Xrs", &tail)) { 2888 // Classic/EVM option, new functionality 2889 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2890 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2891 // change default internal VM signals used - lower case for back compat 2892 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2893 // -Xoptimize 2894 } else if (match_option(option, "-Xoptimize", &tail)) { 2895 // EVM option, ignore silently for compatibility 2896 // -Xprof 2897 } else if (match_option(option, "-Xprof", &tail)) { 2898 #if INCLUDE_FPROF 2899 _has_profile = true; 2900 #else // INCLUDE_FPROF 2901 jio_fprintf(defaultStream::error_stream(), 2902 "Flat profiling is not supported in this VM.\n"); 2903 return JNI_ERR; 2904 #endif // INCLUDE_FPROF 2905 // -Xconcurrentio 2906 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2907 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2908 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2909 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2910 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2911 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2912 2913 // -Xinternalversion 2914 } else if (match_option(option, "-Xinternalversion", &tail)) { 2915 jio_fprintf(defaultStream::output_stream(), "%s\n", 2916 VM_Version::internal_vm_info_string()); 2917 vm_exit(0); 2918 #ifndef PRODUCT 2919 // -Xprintflags 2920 } else if (match_option(option, "-Xprintflags", &tail)) { 2921 CommandLineFlags::printFlags(tty, false); 2922 vm_exit(0); 2923 #endif 2924 // -D 2925 } else if (match_option(option, "-D", &tail)) { 2926 if (!add_property(tail)) { 2927 return JNI_ENOMEM; 2928 } 2929 // Out of the box management support 2930 if (match_option(option, "-Dcom.sun.management", &tail)) { 2931 #if INCLUDE_MANAGEMENT 2932 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2933 #else 2934 jio_fprintf(defaultStream::output_stream(), 2935 "-Dcom.sun.management is not supported in this VM.\n"); 2936 return JNI_ERR; 2937 #endif 2938 } 2939 // -Xint 2940 } else if (match_option(option, "-Xint", &tail)) { 2941 set_mode_flags(_int); 2942 // -Xmixed 2943 } else if (match_option(option, "-Xmixed", &tail)) { 2944 set_mode_flags(_mixed); 2945 // -Xcomp 2946 } else if (match_option(option, "-Xcomp", &tail)) { 2947 // for testing the compiler; turn off all flags that inhibit compilation 2948 set_mode_flags(_comp); 2949 // -Xshare:dump 2950 } else if (match_option(option, "-Xshare:dump", &tail)) { 2951 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2952 set_mode_flags(_int); // Prevent compilation, which creates objects 2953 // -Xshare:on 2954 } else if (match_option(option, "-Xshare:on", &tail)) { 2955 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2956 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2957 // -Xshare:auto 2958 } else if (match_option(option, "-Xshare:auto", &tail)) { 2959 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2960 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2961 // -Xshare:off 2962 } else if (match_option(option, "-Xshare:off", &tail)) { 2963 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2964 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2965 // -Xverify 2966 } else if (match_option(option, "-Xverify", &tail)) { 2967 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2968 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2969 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2970 } else if (strcmp(tail, ":remote") == 0) { 2971 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2972 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2973 } else if (strcmp(tail, ":none") == 0) { 2974 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2975 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2976 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2977 return JNI_EINVAL; 2978 } 2979 // -Xdebug 2980 } else if (match_option(option, "-Xdebug", &tail)) { 2981 // note this flag has been used, then ignore 2982 set_xdebug_mode(true); 2983 // -Xnoagent 2984 } else if (match_option(option, "-Xnoagent", &tail)) { 2985 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2986 } else if (match_option(option, "-Xboundthreads", &tail)) { 2987 // Bind user level threads to kernel threads (Solaris only) 2988 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2989 } else if (match_option(option, "-Xloggc:", &tail)) { 2990 // Redirect GC output to the file. -Xloggc:<filename> 2991 // ostream_init_log(), when called will use this filename 2992 // to initialize a fileStream. 2993 _gc_log_filename = os::strdup_check_oom(tail); 2994 if (!is_filename_valid(_gc_log_filename)) { 2995 jio_fprintf(defaultStream::output_stream(), 2996 "Invalid file name for use with -Xloggc: Filename can only contain the " 2997 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2998 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2999 return JNI_EINVAL; 3000 } 3001 FLAG_SET_CMDLINE(bool, PrintGC, true); 3002 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3003 3004 // JNI hooks 3005 } else if (match_option(option, "-Xcheck", &tail)) { 3006 if (!strcmp(tail, ":jni")) { 3007 #if !INCLUDE_JNI_CHECK 3008 warning("JNI CHECKING is not supported in this VM"); 3009 #else 3010 CheckJNICalls = true; 3011 #endif // INCLUDE_JNI_CHECK 3012 } else if (is_bad_option(option, args->ignoreUnrecognized, 3013 "check")) { 3014 return JNI_EINVAL; 3015 } 3016 } else if (match_option(option, "vfprintf", &tail)) { 3017 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3018 } else if (match_option(option, "exit", &tail)) { 3019 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3020 } else if (match_option(option, "abort", &tail)) { 3021 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3022 // -XX:+AggressiveHeap 3023 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 3024 3025 // This option inspects the machine and attempts to set various 3026 // parameters to be optimal for long-running, memory allocation 3027 // intensive jobs. It is intended for machines with large 3028 // amounts of cpu and memory. 3029 3030 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3031 // VM, but we may not be able to represent the total physical memory 3032 // available (like having 8gb of memory on a box but using a 32bit VM). 3033 // Thus, we need to make sure we're using a julong for intermediate 3034 // calculations. 3035 julong initHeapSize; 3036 julong total_memory = os::physical_memory(); 3037 3038 if (total_memory < (julong)256*M) { 3039 jio_fprintf(defaultStream::error_stream(), 3040 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3041 vm_exit(1); 3042 } 3043 3044 // The heap size is half of available memory, or (at most) 3045 // all of possible memory less 160mb (leaving room for the OS 3046 // when using ISM). This is the maximum; because adaptive sizing 3047 // is turned on below, the actual space used may be smaller. 3048 3049 initHeapSize = MIN2(total_memory / (julong)2, 3050 total_memory - (julong)160*M); 3051 3052 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3053 3054 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3055 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3056 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3057 // Currently the minimum size and the initial heap sizes are the same. 3058 set_min_heap_size(initHeapSize); 3059 } 3060 if (FLAG_IS_DEFAULT(NewSize)) { 3061 // Make the young generation 3/8ths of the total heap. 3062 FLAG_SET_CMDLINE(uintx, NewSize, 3063 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3064 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3065 } 3066 3067 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3068 FLAG_SET_DEFAULT(UseLargePages, true); 3069 #endif 3070 3071 // Increase some data structure sizes for efficiency 3072 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3073 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3074 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3075 3076 // See the OldPLABSize comment below, but replace 'after promotion' 3077 // with 'after copying'. YoungPLABSize is the size of the survivor 3078 // space per-gc-thread buffers. The default is 4kw. 3079 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3080 3081 // OldPLABSize is the size of the buffers in the old gen that 3082 // UseParallelGC uses to promote live data that doesn't fit in the 3083 // survivor spaces. At any given time, there's one for each gc thread. 3084 // The default size is 1kw. These buffers are rarely used, since the 3085 // survivor spaces are usually big enough. For specjbb, however, there 3086 // are occasions when there's lots of live data in the young gen 3087 // and we end up promoting some of it. We don't have a definite 3088 // explanation for why bumping OldPLABSize helps, but the theory 3089 // is that a bigger PLAB results in retaining something like the 3090 // original allocation order after promotion, which improves mutator 3091 // locality. A minor effect may be that larger PLABs reduce the 3092 // number of PLAB allocation events during gc. The value of 8kw 3093 // was arrived at by experimenting with specjbb. 3094 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3095 3096 // Enable parallel GC and adaptive generation sizing 3097 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3098 FLAG_SET_DEFAULT(ParallelGCThreads, 3099 Abstract_VM_Version::parallel_worker_threads()); 3100 3101 // Encourage steady state memory management 3102 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3103 3104 // This appears to improve mutator locality 3105 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3106 3107 // Get around early Solaris scheduling bug 3108 // (affinity vs other jobs on system) 3109 // but disallow DR and offlining (5008695). 3110 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3111 3112 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3113 // and the last option wins. 3114 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3115 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3116 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3117 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3118 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3119 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3120 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3121 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3122 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3123 uintx max_tenuring_thresh = 0; 3124 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3125 jio_fprintf(defaultStream::error_stream(), 3126 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3127 } 3128 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3129 3130 if (MaxTenuringThreshold == 0) { 3131 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3132 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3133 } else { 3134 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3135 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3136 } 3137 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3138 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3139 jio_fprintf(defaultStream::error_stream(), 3140 "Please use CMSClassUnloadingEnabled in place of " 3141 "CMSPermGenSweepingEnabled in the future\n"); 3142 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3143 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3144 jio_fprintf(defaultStream::error_stream(), 3145 "Please use -XX:+UseGCOverheadLimit in place of " 3146 "-XX:+UseGCTimeLimit in the future\n"); 3147 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3148 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3149 jio_fprintf(defaultStream::error_stream(), 3150 "Please use -XX:-UseGCOverheadLimit in place of " 3151 "-XX:-UseGCTimeLimit in the future\n"); 3152 // The TLE options are for compatibility with 1.3 and will be 3153 // removed without notice in a future release. These options 3154 // are not to be documented. 3155 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3156 // No longer used. 3157 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3158 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3159 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3160 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3161 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3162 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3163 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3164 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3165 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3166 // No longer used. 3167 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3168 julong long_tlab_size = 0; 3169 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3170 if (errcode != arg_in_range) { 3171 jio_fprintf(defaultStream::error_stream(), 3172 "Invalid TLAB size: %s\n", option->optionString); 3173 describe_range_error(errcode); 3174 return JNI_EINVAL; 3175 } 3176 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3177 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3178 // No longer used. 3179 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3180 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3181 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3182 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3183 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3184 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3185 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3186 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3187 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3188 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3189 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3190 #if defined(DTRACE_ENABLED) 3191 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3192 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3193 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3194 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3195 #else // defined(DTRACE_ENABLED) 3196 jio_fprintf(defaultStream::error_stream(), 3197 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3198 return JNI_EINVAL; 3199 #endif // defined(DTRACE_ENABLED) 3200 #ifdef ASSERT 3201 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3202 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3203 // disable scavenge before parallel mark-compact 3204 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3205 #endif 3206 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3207 julong cms_blocks_to_claim = (julong)atol(tail); 3208 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3209 jio_fprintf(defaultStream::error_stream(), 3210 "Please use -XX:OldPLABSize in place of " 3211 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3212 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3213 julong cms_blocks_to_claim = (julong)atol(tail); 3214 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3215 jio_fprintf(defaultStream::error_stream(), 3216 "Please use -XX:OldPLABSize in place of " 3217 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3218 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3219 julong old_plab_size = 0; 3220 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3221 if (errcode != arg_in_range) { 3222 jio_fprintf(defaultStream::error_stream(), 3223 "Invalid old PLAB size: %s\n", option->optionString); 3224 describe_range_error(errcode); 3225 return JNI_EINVAL; 3226 } 3227 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3228 jio_fprintf(defaultStream::error_stream(), 3229 "Please use -XX:OldPLABSize in place of " 3230 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3231 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3232 julong young_plab_size = 0; 3233 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3234 if (errcode != arg_in_range) { 3235 jio_fprintf(defaultStream::error_stream(), 3236 "Invalid young PLAB size: %s\n", option->optionString); 3237 describe_range_error(errcode); 3238 return JNI_EINVAL; 3239 } 3240 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3241 jio_fprintf(defaultStream::error_stream(), 3242 "Please use -XX:YoungPLABSize in place of " 3243 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3244 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3245 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3246 julong stack_size = 0; 3247 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3248 if (errcode != arg_in_range) { 3249 jio_fprintf(defaultStream::error_stream(), 3250 "Invalid mark stack size: %s\n", option->optionString); 3251 describe_range_error(errcode); 3252 return JNI_EINVAL; 3253 } 3254 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3255 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3256 julong max_stack_size = 0; 3257 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3258 if (errcode != arg_in_range) { 3259 jio_fprintf(defaultStream::error_stream(), 3260 "Invalid maximum mark stack size: %s\n", 3261 option->optionString); 3262 describe_range_error(errcode); 3263 return JNI_EINVAL; 3264 } 3265 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3266 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3267 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3268 uintx conc_threads = 0; 3269 if (!parse_uintx(tail, &conc_threads, 1)) { 3270 jio_fprintf(defaultStream::error_stream(), 3271 "Invalid concurrent threads: %s\n", option->optionString); 3272 return JNI_EINVAL; 3273 } 3274 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3275 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3276 julong max_direct_memory_size = 0; 3277 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3278 if (errcode != arg_in_range) { 3279 jio_fprintf(defaultStream::error_stream(), 3280 "Invalid maximum direct memory size: %s\n", 3281 option->optionString); 3282 describe_range_error(errcode); 3283 return JNI_EINVAL; 3284 } 3285 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3286 #if !INCLUDE_MANAGEMENT 3287 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3288 jio_fprintf(defaultStream::error_stream(), 3289 "ManagementServer is not supported in this VM.\n"); 3290 return JNI_ERR; 3291 #endif // INCLUDE_MANAGEMENT 3292 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3293 // Skip -XX:Flags= since that case has already been handled 3294 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3295 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3296 return JNI_EINVAL; 3297 } 3298 } 3299 // Unknown option 3300 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3301 return JNI_ERR; 3302 } 3303 } 3304 3305 // Change the default value for flags which have different default values 3306 // when working with older JDKs. 3307 #ifdef LINUX 3308 if (JDK_Version::current().compare_major(6) <= 0 && 3309 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3310 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3311 } 3312 #endif // LINUX 3313 return JNI_OK; 3314 } 3315 3316 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3317 // This must be done after all -D arguments have been processed. 3318 scp_p->expand_endorsed(); 3319 3320 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3321 // Assemble the bootclasspath elements into the final path. 3322 Arguments::set_sysclasspath(scp_p->combined_path()); 3323 } 3324 3325 // This must be done after all arguments have been processed. 3326 // java_compiler() true means set to "NONE" or empty. 3327 if (java_compiler() && !xdebug_mode()) { 3328 // For backwards compatibility, we switch to interpreted mode if 3329 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3330 // not specified. 3331 set_mode_flags(_int); 3332 } 3333 if (CompileThreshold == 0) { 3334 set_mode_flags(_int); 3335 } 3336 3337 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3338 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3339 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3340 } 3341 3342 #ifndef COMPILER2 3343 // Don't degrade server performance for footprint 3344 if (FLAG_IS_DEFAULT(UseLargePages) && 3345 MaxHeapSize < LargePageHeapSizeThreshold) { 3346 // No need for large granularity pages w/small heaps. 3347 // Note that large pages are enabled/disabled for both the 3348 // Java heap and the code cache. 3349 FLAG_SET_DEFAULT(UseLargePages, false); 3350 } 3351 3352 #else 3353 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3354 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3355 } 3356 #endif 3357 3358 #ifndef TIERED 3359 // Tiered compilation is undefined. 3360 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3361 #endif 3362 3363 // If we are running in a headless jre, force java.awt.headless property 3364 // to be true unless the property has already been set. 3365 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3366 if (os::is_headless_jre()) { 3367 const char* headless = Arguments::get_property("java.awt.headless"); 3368 if (headless == NULL) { 3369 char envbuffer[128]; 3370 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3371 if (!add_property("java.awt.headless=true")) { 3372 return JNI_ENOMEM; 3373 } 3374 } else { 3375 char buffer[256]; 3376 strcpy(buffer, "java.awt.headless="); 3377 strcat(buffer, envbuffer); 3378 if (!add_property(buffer)) { 3379 return JNI_ENOMEM; 3380 } 3381 } 3382 } 3383 } 3384 3385 if (!check_vm_args_consistency()) { 3386 return JNI_ERR; 3387 } 3388 3389 return JNI_OK; 3390 } 3391 3392 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3393 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3394 scp_assembly_required_p); 3395 } 3396 3397 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3398 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3399 scp_assembly_required_p); 3400 } 3401 3402 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3403 const int N_MAX_OPTIONS = 64; 3404 const int OPTION_BUFFER_SIZE = 1024; 3405 char buffer[OPTION_BUFFER_SIZE]; 3406 3407 // The variable will be ignored if it exceeds the length of the buffer. 3408 // Don't check this variable if user has special privileges 3409 // (e.g. unix su command). 3410 if (os::getenv(name, buffer, sizeof(buffer)) && 3411 !os::have_special_privileges()) { 3412 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3413 jio_fprintf(defaultStream::error_stream(), 3414 "Picked up %s: %s\n", name, buffer); 3415 char* rd = buffer; // pointer to the input string (rd) 3416 int i; 3417 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3418 while (isspace(*rd)) rd++; // skip whitespace 3419 if (*rd == 0) break; // we re done when the input string is read completely 3420 3421 // The output, option string, overwrites the input string. 3422 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3423 // input string (rd). 3424 char* wrt = rd; 3425 3426 options[i++].optionString = wrt; // Fill in option 3427 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3428 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3429 int quote = *rd; // matching quote to look for 3430 rd++; // don't copy open quote 3431 while (*rd != quote) { // include everything (even spaces) up until quote 3432 if (*rd == 0) { // string termination means unmatched string 3433 jio_fprintf(defaultStream::error_stream(), 3434 "Unmatched quote in %s\n", name); 3435 return JNI_ERR; 3436 } 3437 *wrt++ = *rd++; // copy to option string 3438 } 3439 rd++; // don't copy close quote 3440 } else { 3441 *wrt++ = *rd++; // copy to option string 3442 } 3443 } 3444 // Need to check if we're done before writing a NULL, 3445 // because the write could be to the byte that rd is pointing to. 3446 if (*rd++ == 0) { 3447 *wrt = 0; 3448 break; 3449 } 3450 *wrt = 0; // Zero terminate option 3451 } 3452 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3453 JavaVMInitArgs vm_args; 3454 vm_args.version = JNI_VERSION_1_2; 3455 vm_args.options = options; 3456 vm_args.nOptions = i; 3457 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3458 3459 if (PrintVMOptions) { 3460 const char* tail; 3461 for (int i = 0; i < vm_args.nOptions; i++) { 3462 const JavaVMOption *option = vm_args.options + i; 3463 if (match_option(option, "-XX:", &tail)) { 3464 logOption(tail); 3465 } 3466 } 3467 } 3468 3469 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3470 } 3471 return JNI_OK; 3472 } 3473 3474 void Arguments::set_shared_spaces_flags() { 3475 if (DumpSharedSpaces) { 3476 if (RequireSharedSpaces) { 3477 warning("cannot dump shared archive while using shared archive"); 3478 } 3479 UseSharedSpaces = false; 3480 #ifdef _LP64 3481 if (!UseCompressedOops || !UseCompressedClassPointers) { 3482 vm_exit_during_initialization( 3483 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3484 } 3485 } else { 3486 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces. 3487 if (!UseCompressedOops || !UseCompressedClassPointers) { 3488 no_shared_spaces(); 3489 } 3490 #endif 3491 } 3492 } 3493 3494 #if !INCLUDE_ALL_GCS 3495 static void force_serial_gc() { 3496 FLAG_SET_DEFAULT(UseSerialGC, true); 3497 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3498 UNSUPPORTED_GC_OPTION(UseG1GC); 3499 UNSUPPORTED_GC_OPTION(UseParallelGC); 3500 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3501 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3502 UNSUPPORTED_GC_OPTION(UseParNewGC); 3503 } 3504 #endif // INCLUDE_ALL_GCS 3505 3506 // Sharing support 3507 // Construct the path to the archive 3508 static char* get_shared_archive_path() { 3509 char *shared_archive_path; 3510 if (SharedArchiveFile == NULL) { 3511 char jvm_path[JVM_MAXPATHLEN]; 3512 os::jvm_path(jvm_path, sizeof(jvm_path)); 3513 char *end = strrchr(jvm_path, *os::file_separator()); 3514 if (end != NULL) *end = '\0'; 3515 size_t jvm_path_len = strlen(jvm_path); 3516 size_t file_sep_len = strlen(os::file_separator()); 3517 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3518 file_sep_len + 20, mtInternal); 3519 if (shared_archive_path != NULL) { 3520 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3521 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3522 strncat(shared_archive_path, "classes.jsa", 11); 3523 } 3524 } else { 3525 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3526 if (shared_archive_path != NULL) { 3527 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3528 } 3529 } 3530 return shared_archive_path; 3531 } 3532 3533 #ifndef PRODUCT 3534 // Determine whether LogVMOutput should be implicitly turned on. 3535 static bool use_vm_log() { 3536 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3537 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3538 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3539 PrintAssembly || TraceDeoptimization || TraceDependencies || 3540 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3541 return true; 3542 } 3543 3544 #ifdef COMPILER1 3545 if (PrintC1Statistics) { 3546 return true; 3547 } 3548 #endif // COMPILER1 3549 3550 #ifdef COMPILER2 3551 if (PrintOptoAssembly || PrintOptoStatistics) { 3552 return true; 3553 } 3554 #endif // COMPILER2 3555 3556 return false; 3557 } 3558 #endif // PRODUCT 3559 3560 // Parse entry point called from JNI_CreateJavaVM 3561 3562 jint Arguments::parse(const JavaVMInitArgs* args) { 3563 3564 // Remaining part of option string 3565 const char* tail; 3566 3567 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3568 const char* hotspotrc = ".hotspotrc"; 3569 bool settings_file_specified = false; 3570 bool needs_hotspotrc_warning = false; 3571 3572 const char* flags_file; 3573 int index; 3574 for (index = 0; index < args->nOptions; index++) { 3575 const JavaVMOption *option = args->options + index; 3576 if (match_option(option, "-XX:Flags=", &tail)) { 3577 flags_file = tail; 3578 settings_file_specified = true; 3579 } 3580 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3581 PrintVMOptions = true; 3582 } 3583 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3584 PrintVMOptions = false; 3585 } 3586 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3587 IgnoreUnrecognizedVMOptions = true; 3588 } 3589 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3590 IgnoreUnrecognizedVMOptions = false; 3591 } 3592 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3593 CommandLineFlags::printFlags(tty, false); 3594 vm_exit(0); 3595 } 3596 #if INCLUDE_NMT 3597 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3598 // The launcher did not setup nmt environment variable properly. 3599 // if (!MemTracker::check_launcher_nmt_support(tail)) { 3600 // warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3601 // } 3602 3603 // Verify if nmt option is valid. 3604 if (MemTracker::verify_nmt_option()) { 3605 // Late initialization, still in single-threaded mode. 3606 if (MemTracker::tracking_level() >= NMT_summary) { 3607 MemTracker::init(); 3608 } 3609 } else { 3610 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3611 } 3612 } 3613 #endif 3614 3615 3616 #ifndef PRODUCT 3617 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3618 CommandLineFlags::printFlags(tty, true); 3619 vm_exit(0); 3620 } 3621 #endif 3622 } 3623 3624 if (IgnoreUnrecognizedVMOptions) { 3625 // uncast const to modify the flag args->ignoreUnrecognized 3626 *(jboolean*)(&args->ignoreUnrecognized) = true; 3627 } 3628 3629 // Parse specified settings file 3630 if (settings_file_specified) { 3631 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3632 return JNI_EINVAL; 3633 } 3634 } else { 3635 #ifdef ASSERT 3636 // Parse default .hotspotrc settings file 3637 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3638 return JNI_EINVAL; 3639 } 3640 #else 3641 struct stat buf; 3642 if (os::stat(hotspotrc, &buf) == 0) { 3643 needs_hotspotrc_warning = true; 3644 } 3645 #endif 3646 } 3647 3648 if (PrintVMOptions) { 3649 for (index = 0; index < args->nOptions; index++) { 3650 const JavaVMOption *option = args->options + index; 3651 if (match_option(option, "-XX:", &tail)) { 3652 logOption(tail); 3653 } 3654 } 3655 } 3656 3657 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3658 jint result = parse_vm_init_args(args); 3659 if (result != JNI_OK) { 3660 return result; 3661 } 3662 3663 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3664 SharedArchivePath = get_shared_archive_path(); 3665 if (SharedArchivePath == NULL) { 3666 return JNI_ENOMEM; 3667 } 3668 3669 // Delay warning until here so that we've had a chance to process 3670 // the -XX:-PrintWarnings flag 3671 if (needs_hotspotrc_warning) { 3672 warning("%s file is present but has been ignored. " 3673 "Run with -XX:Flags=%s to load the file.", 3674 hotspotrc, hotspotrc); 3675 } 3676 3677 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3678 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3679 #endif 3680 3681 #if INCLUDE_ALL_GCS 3682 #if (defined JAVASE_EMBEDDED || defined ARM) 3683 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3684 #endif 3685 #endif 3686 3687 #ifndef PRODUCT 3688 if (TraceBytecodesAt != 0) { 3689 TraceBytecodes = true; 3690 } 3691 if (CountCompiledCalls) { 3692 if (UseCounterDecay) { 3693 warning("UseCounterDecay disabled because CountCalls is set"); 3694 UseCounterDecay = false; 3695 } 3696 } 3697 #endif // PRODUCT 3698 3699 if (ScavengeRootsInCode == 0) { 3700 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3701 warning("forcing ScavengeRootsInCode non-zero"); 3702 } 3703 ScavengeRootsInCode = 1; 3704 } 3705 3706 if (PrintGCDetails) { 3707 // Turn on -verbose:gc options as well 3708 PrintGC = true; 3709 } 3710 3711 // Set object alignment values. 3712 set_object_alignment(); 3713 3714 #if !INCLUDE_ALL_GCS 3715 force_serial_gc(); 3716 #endif // INCLUDE_ALL_GCS 3717 #if !INCLUDE_CDS 3718 if (DumpSharedSpaces || RequireSharedSpaces) { 3719 jio_fprintf(defaultStream::error_stream(), 3720 "Shared spaces are not supported in this VM\n"); 3721 return JNI_ERR; 3722 } 3723 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3724 warning("Shared spaces are not supported in this VM"); 3725 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3726 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3727 } 3728 no_shared_spaces(); 3729 #endif // INCLUDE_CDS 3730 3731 return JNI_OK; 3732 } 3733 3734 jint Arguments::apply_ergo() { 3735 3736 // Set flags based on ergonomics. 3737 set_ergonomics_flags(); 3738 3739 set_shared_spaces_flags(); 3740 3741 // Check the GC selections again. 3742 if (!check_gc_consistency()) { 3743 return JNI_EINVAL; 3744 } 3745 3746 if (TieredCompilation) { 3747 set_tiered_flags(); 3748 } else { 3749 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3750 if (CompilationPolicyChoice >= 2) { 3751 vm_exit_during_initialization( 3752 "Incompatible compilation policy selected", NULL); 3753 } 3754 } 3755 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 3756 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3757 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 3758 } 3759 3760 3761 // Set heap size based on available physical memory 3762 set_heap_size(); 3763 3764 #if INCLUDE_ALL_GCS 3765 // Set per-collector flags 3766 if (UseParallelGC || UseParallelOldGC) { 3767 set_parallel_gc_flags(); 3768 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 3769 set_cms_and_parnew_gc_flags(); 3770 } else if (UseParNewGC) { // Skipped if CMS is set above 3771 set_parnew_gc_flags(); 3772 } else if (UseG1GC) { 3773 set_g1_gc_flags(); 3774 } 3775 check_deprecated_gcs(); 3776 check_deprecated_gc_flags(); 3777 if (AssumeMP && !UseSerialGC) { 3778 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3779 warning("If the number of processors is expected to increase from one, then" 3780 " you should configure the number of parallel GC threads appropriately" 3781 " using -XX:ParallelGCThreads=N"); 3782 } 3783 } 3784 if (MinHeapFreeRatio == 100) { 3785 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 3786 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 3787 } 3788 #else // INCLUDE_ALL_GCS 3789 assert(verify_serial_gc_flags(), "SerialGC unset"); 3790 #endif // INCLUDE_ALL_GCS 3791 3792 // Initialize Metaspace flags and alignments 3793 Metaspace::ergo_initialize(); 3794 3795 // Set bytecode rewriting flags 3796 set_bytecode_flags(); 3797 3798 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3799 set_aggressive_opts_flags(); 3800 3801 // Turn off biased locking for locking debug mode flags, 3802 // which are subtly different from each other but neither works with 3803 // biased locking 3804 if (UseHeavyMonitors 3805 #ifdef COMPILER1 3806 || !UseFastLocking 3807 #endif // COMPILER1 3808 ) { 3809 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3810 // flag set to true on command line; warn the user that they 3811 // can't enable biased locking here 3812 warning("Biased Locking is not supported with locking debug flags" 3813 "; ignoring UseBiasedLocking flag." ); 3814 } 3815 UseBiasedLocking = false; 3816 } 3817 3818 #ifdef ZERO 3819 // Clear flags not supported on zero. 3820 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3821 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3822 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3823 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3824 #endif // CC_INTERP 3825 3826 #ifdef COMPILER2 3827 if (!EliminateLocks) { 3828 EliminateNestedLocks = false; 3829 } 3830 if (!Inline) { 3831 IncrementalInline = false; 3832 } 3833 #ifndef PRODUCT 3834 if (!IncrementalInline) { 3835 AlwaysIncrementalInline = false; 3836 } 3837 #endif 3838 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3839 // nothing to use the profiling, turn if off 3840 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3841 } 3842 #endif 3843 3844 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3845 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3846 DebugNonSafepoints = true; 3847 } 3848 3849 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3850 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3851 } 3852 3853 #ifndef PRODUCT 3854 if (CompileTheWorld) { 3855 // Force NmethodSweeper to sweep whole CodeCache each time. 3856 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3857 NmethodSweepFraction = 1; 3858 } 3859 } 3860 3861 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3862 if (use_vm_log()) { 3863 LogVMOutput = true; 3864 } 3865 } 3866 #endif // PRODUCT 3867 3868 if (PrintCommandLineFlags) { 3869 CommandLineFlags::printSetFlags(tty); 3870 } 3871 3872 // Apply CPU specific policy for the BiasedLocking 3873 if (UseBiasedLocking) { 3874 if (!VM_Version::use_biased_locking() && 3875 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3876 UseBiasedLocking = false; 3877 } 3878 } 3879 #ifdef COMPILER2 3880 if (!UseBiasedLocking || EmitSync != 0) { 3881 UseOptoBiasInlining = false; 3882 } 3883 #endif 3884 3885 return JNI_OK; 3886 } 3887 3888 jint Arguments::adjust_after_os() { 3889 if (UseNUMA) { 3890 if (UseParallelGC || UseParallelOldGC) { 3891 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3892 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3893 } 3894 } 3895 // UseNUMAInterleaving is set to ON for all collectors and 3896 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3897 // such as the parallel collector for Linux and Solaris will 3898 // interleave old gen and survivor spaces on top of NUMA 3899 // allocation policy for the eden space. 3900 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3901 // all platforms and ParallelGC on Windows will interleave all 3902 // of the heap spaces across NUMA nodes. 3903 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3904 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3905 } 3906 } 3907 return JNI_OK; 3908 } 3909 3910 int Arguments::PropertyList_count(SystemProperty* pl) { 3911 int count = 0; 3912 while(pl != NULL) { 3913 count++; 3914 pl = pl->next(); 3915 } 3916 return count; 3917 } 3918 3919 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3920 assert(key != NULL, "just checking"); 3921 SystemProperty* prop; 3922 for (prop = pl; prop != NULL; prop = prop->next()) { 3923 if (strcmp(key, prop->key()) == 0) return prop->value(); 3924 } 3925 return NULL; 3926 } 3927 3928 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3929 int count = 0; 3930 const char* ret_val = NULL; 3931 3932 while(pl != NULL) { 3933 if(count >= index) { 3934 ret_val = pl->key(); 3935 break; 3936 } 3937 count++; 3938 pl = pl->next(); 3939 } 3940 3941 return ret_val; 3942 } 3943 3944 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3945 int count = 0; 3946 char* ret_val = NULL; 3947 3948 while(pl != NULL) { 3949 if(count >= index) { 3950 ret_val = pl->value(); 3951 break; 3952 } 3953 count++; 3954 pl = pl->next(); 3955 } 3956 3957 return ret_val; 3958 } 3959 3960 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3961 SystemProperty* p = *plist; 3962 if (p == NULL) { 3963 *plist = new_p; 3964 } else { 3965 while (p->next() != NULL) { 3966 p = p->next(); 3967 } 3968 p->set_next(new_p); 3969 } 3970 } 3971 3972 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3973 if (plist == NULL) 3974 return; 3975 3976 SystemProperty* new_p = new SystemProperty(k, v, true); 3977 PropertyList_add(plist, new_p); 3978 } 3979 3980 // This add maintains unique property key in the list. 3981 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3982 if (plist == NULL) 3983 return; 3984 3985 // If property key exist then update with new value. 3986 SystemProperty* prop; 3987 for (prop = *plist; prop != NULL; prop = prop->next()) { 3988 if (strcmp(k, prop->key()) == 0) { 3989 if (append) { 3990 prop->append_value(v); 3991 } else { 3992 prop->set_value(v); 3993 } 3994 return; 3995 } 3996 } 3997 3998 PropertyList_add(plist, k, v); 3999 } 4000 4001 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4002 // Returns true if all of the source pointed by src has been copied over to 4003 // the destination buffer pointed by buf. Otherwise, returns false. 4004 // Notes: 4005 // 1. If the length (buflen) of the destination buffer excluding the 4006 // NULL terminator character is not long enough for holding the expanded 4007 // pid characters, it also returns false instead of returning the partially 4008 // expanded one. 4009 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4010 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4011 char* buf, size_t buflen) { 4012 const char* p = src; 4013 char* b = buf; 4014 const char* src_end = &src[srclen]; 4015 char* buf_end = &buf[buflen - 1]; 4016 4017 while (p < src_end && b < buf_end) { 4018 if (*p == '%') { 4019 switch (*(++p)) { 4020 case '%': // "%%" ==> "%" 4021 *b++ = *p++; 4022 break; 4023 case 'p': { // "%p" ==> current process id 4024 // buf_end points to the character before the last character so 4025 // that we could write '\0' to the end of the buffer. 4026 size_t buf_sz = buf_end - b + 1; 4027 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4028 4029 // if jio_snprintf fails or the buffer is not long enough to hold 4030 // the expanded pid, returns false. 4031 if (ret < 0 || ret >= (int)buf_sz) { 4032 return false; 4033 } else { 4034 b += ret; 4035 assert(*b == '\0', "fail in copy_expand_pid"); 4036 if (p == src_end && b == buf_end + 1) { 4037 // reach the end of the buffer. 4038 return true; 4039 } 4040 } 4041 p++; 4042 break; 4043 } 4044 default : 4045 *b++ = '%'; 4046 } 4047 } else { 4048 *b++ = *p++; 4049 } 4050 } 4051 *b = '\0'; 4052 return (p == src_end); // return false if not all of the source was copied 4053 }