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 "services/management.hpp" 41 #include "services/memTracker.hpp" 42 #include "utilities/defaultStream.hpp" 43 #include "utilities/macros.hpp" 44 #include "utilities/taskqueue.hpp" 45 #ifdef TARGET_OS_FAMILY_linux 46 # include "os_linux.inline.hpp" 47 #endif 48 #ifdef TARGET_OS_FAMILY_solaris 49 # include "os_solaris.inline.hpp" 50 #endif 51 #ifdef TARGET_OS_FAMILY_windows 52 # include "os_windows.inline.hpp" 53 #endif 54 #ifdef TARGET_OS_FAMILY_aix 55 # include "os_aix.inline.hpp" 56 #endif 57 #ifdef TARGET_OS_FAMILY_bsd 58 # include "os_bsd.inline.hpp" 59 #endif 60 #if INCLUDE_ALL_GCS 61 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 62 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 63 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 64 #endif // INCLUDE_ALL_GCS 65 66 // Note: This is a special bug reporting site for the JVM 67 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 68 #define DEFAULT_JAVA_LAUNCHER "generic" 69 70 // Disable options not supported in this release, with a warning if they 71 // were explicitly requested on the command-line 72 #define UNSUPPORTED_OPTION(opt, description) \ 73 do { \ 74 if (opt) { \ 75 if (FLAG_IS_CMDLINE(opt)) { \ 76 warning(description " is disabled in this release."); \ 77 } \ 78 FLAG_SET_DEFAULT(opt, false); \ 79 } \ 80 } while(0) 81 82 #define UNSUPPORTED_GC_OPTION(gc) \ 83 do { \ 84 if (gc) { \ 85 if (FLAG_IS_CMDLINE(gc)) { \ 86 warning(#gc " is not supported in this VM. Using Serial GC."); \ 87 } \ 88 FLAG_SET_DEFAULT(gc, false); \ 89 } \ 90 } while(0) 91 92 char** Arguments::_jvm_flags_array = NULL; 93 int Arguments::_num_jvm_flags = 0; 94 char** Arguments::_jvm_args_array = NULL; 95 int Arguments::_num_jvm_args = 0; 96 char* Arguments::_java_command = NULL; 97 SystemProperty* Arguments::_system_properties = NULL; 98 const char* Arguments::_gc_log_filename = NULL; 99 bool Arguments::_has_profile = false; 100 size_t Arguments::_conservative_max_heap_alignment = 0; 101 uintx Arguments::_min_heap_size = 0; 102 Arguments::Mode Arguments::_mode = _mixed; 103 bool Arguments::_java_compiler = false; 104 bool Arguments::_xdebug_mode = false; 105 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 106 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 107 int Arguments::_sun_java_launcher_pid = -1; 108 bool Arguments::_sun_java_launcher_is_altjvm = false; 109 110 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 111 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 112 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 113 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 114 bool Arguments::_ClipInlining = ClipInlining; 115 116 char* Arguments::SharedArchivePath = NULL; 117 118 AgentLibraryList Arguments::_libraryList; 119 AgentLibraryList Arguments::_agentList; 120 121 abort_hook_t Arguments::_abort_hook = NULL; 122 exit_hook_t Arguments::_exit_hook = NULL; 123 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 124 125 126 SystemProperty *Arguments::_java_ext_dirs = NULL; 127 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 128 SystemProperty *Arguments::_sun_boot_library_path = NULL; 129 SystemProperty *Arguments::_java_library_path = NULL; 130 SystemProperty *Arguments::_java_home = NULL; 131 SystemProperty *Arguments::_java_class_path = NULL; 132 SystemProperty *Arguments::_sun_boot_class_path = NULL; 133 134 char* Arguments::_meta_index_path = NULL; 135 char* Arguments::_meta_index_dir = NULL; 136 137 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 138 139 static bool match_option(const JavaVMOption *option, const char* name, 140 const char** tail) { 141 int len = (int)strlen(name); 142 if (strncmp(option->optionString, name, len) == 0) { 143 *tail = option->optionString + len; 144 return true; 145 } else { 146 return false; 147 } 148 } 149 150 static void logOption(const char* opt) { 151 if (PrintVMOptions) { 152 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 153 } 154 } 155 156 // Process java launcher properties. 157 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 158 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 159 // sun.java.launcher.pid is defined. 160 // Must do this before setting up other system properties, 161 // as some of them may depend on launcher type. 162 for (int index = 0; index < args->nOptions; index++) { 163 const JavaVMOption* option = args->options + index; 164 const char* tail; 165 166 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 167 process_java_launcher_argument(tail, option->extraInfo); 168 continue; 169 } 170 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 171 if (strcmp(tail, "true") == 0) { 172 _sun_java_launcher_is_altjvm = true; 173 } 174 continue; 175 } 176 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 177 _sun_java_launcher_pid = atoi(tail); 178 continue; 179 } 180 } 181 } 182 183 // Initialize system properties key and value. 184 void Arguments::init_system_properties() { 185 186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 187 "Java Virtual Machine Specification", false)); 188 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 190 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 191 192 // Following are JVMTI agent writable properties. 193 // Properties values are set to NULL and they are 194 // os specific they are initialized in os::init_system_properties_values(). 195 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 196 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 197 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 198 _java_library_path = new SystemProperty("java.library.path", NULL, true); 199 _java_home = new SystemProperty("java.home", NULL, true); 200 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 201 202 _java_class_path = new SystemProperty("java.class.path", "", true); 203 204 // Add to System Property list. 205 PropertyList_add(&_system_properties, _java_ext_dirs); 206 PropertyList_add(&_system_properties, _java_endorsed_dirs); 207 PropertyList_add(&_system_properties, _sun_boot_library_path); 208 PropertyList_add(&_system_properties, _java_library_path); 209 PropertyList_add(&_system_properties, _java_home); 210 PropertyList_add(&_system_properties, _java_class_path); 211 PropertyList_add(&_system_properties, _sun_boot_class_path); 212 213 // Set OS specific system properties values 214 os::init_system_properties_values(); 215 } 216 217 218 // Update/Initialize System properties after JDK version number is known 219 void Arguments::init_version_specific_system_properties() { 220 enum { bufsz = 16 }; 221 char buffer[bufsz]; 222 const char* spec_vendor = "Sun Microsystems Inc."; 223 uint32_t spec_version = 0; 224 225 if (JDK_Version::is_gte_jdk17x_version()) { 226 spec_vendor = "Oracle Corporation"; 227 spec_version = JDK_Version::current().major_version(); 228 } 229 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 230 231 PropertyList_add(&_system_properties, 232 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 233 PropertyList_add(&_system_properties, 234 new SystemProperty("java.vm.specification.version", buffer, false)); 235 PropertyList_add(&_system_properties, 236 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 237 } 238 239 /** 240 * Provide a slightly more user-friendly way of eliminating -XX flags. 241 * When a flag is eliminated, it can be added to this list in order to 242 * continue accepting this flag on the command-line, while issuing a warning 243 * and ignoring the value. Once the JDK version reaches the 'accept_until' 244 * limit, we flatly refuse to admit the existence of the flag. This allows 245 * a flag to die correctly over JDK releases using HSX. 246 */ 247 typedef struct { 248 const char* name; 249 JDK_Version obsoleted_in; // when the flag went away 250 JDK_Version accept_until; // which version to start denying the existence 251 } ObsoleteFlag; 252 253 static ObsoleteFlag obsolete_jvm_flags[] = { 254 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 260 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 261 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 262 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 263 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 264 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 265 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 266 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 267 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 268 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 269 { "DefaultInitialRAMFraction", 270 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 271 { "UseDepthFirstScavengeOrder", 272 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 273 { "HandlePromotionFailure", 274 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 275 { "MaxLiveObjectEvacuationRatio", 276 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 277 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 278 { "UseParallelOldGCCompacting", 279 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 280 { "UseParallelDensePrefixUpdate", 281 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 282 { "UseParallelOldGCDensePrefix", 283 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 284 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 285 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 286 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 297 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 302 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 303 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 304 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 305 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 306 #ifdef PRODUCT 307 { "DesiredMethodLimit", 308 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 309 #endif // PRODUCT 310 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 311 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 312 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 313 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 314 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 315 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 316 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 317 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 318 { NULL, JDK_Version(0), JDK_Version(0) } 319 }; 320 321 // Returns true if the flag is obsolete and fits into the range specified 322 // for being ignored. In the case that the flag is ignored, the 'version' 323 // value is filled in with the version number when the flag became 324 // obsolete so that that value can be displayed to the user. 325 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 326 int i = 0; 327 assert(version != NULL, "Must provide a version buffer"); 328 while (obsolete_jvm_flags[i].name != NULL) { 329 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 330 // <flag>=xxx form 331 // [-|+]<flag> form 332 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 333 ((s[0] == '+' || s[0] == '-') && 334 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 335 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 336 *version = flag_status.obsoleted_in; 337 return true; 338 } 339 } 340 i++; 341 } 342 return false; 343 } 344 345 // Constructs the system class path (aka boot class path) from the following 346 // components, in order: 347 // 348 // prefix // from -Xbootclasspath/p:... 349 // endorsed // the expansion of -Djava.endorsed.dirs=... 350 // base // from os::get_system_properties() or -Xbootclasspath= 351 // suffix // from -Xbootclasspath/a:... 352 // 353 // java.endorsed.dirs is a list of directories; any jar or zip files in the 354 // directories are added to the sysclasspath just before the base. 355 // 356 // This could be AllStatic, but it isn't needed after argument processing is 357 // complete. 358 class SysClassPath: public StackObj { 359 public: 360 SysClassPath(const char* base); 361 ~SysClassPath(); 362 363 inline void set_base(const char* base); 364 inline void add_prefix(const char* prefix); 365 inline void add_suffix_to_prefix(const char* suffix); 366 inline void add_suffix(const char* suffix); 367 inline void reset_path(const char* base); 368 369 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 370 // property. Must be called after all command-line arguments have been 371 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 372 // combined_path(). 373 void expand_endorsed(); 374 375 inline const char* get_base() const { return _items[_scp_base]; } 376 inline const char* get_prefix() const { return _items[_scp_prefix]; } 377 inline const char* get_suffix() const { return _items[_scp_suffix]; } 378 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 379 380 // Combine all the components into a single c-heap-allocated string; caller 381 // must free the string if/when no longer needed. 382 char* combined_path(); 383 384 private: 385 // Utility routines. 386 static char* add_to_path(const char* path, const char* str, bool prepend); 387 static char* add_jars_to_path(char* path, const char* directory); 388 389 inline void reset_item_at(int index); 390 391 // Array indices for the items that make up the sysclasspath. All except the 392 // base are allocated in the C heap and freed by this class. 393 enum { 394 _scp_prefix, // from -Xbootclasspath/p:... 395 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 396 _scp_base, // the default sysclasspath 397 _scp_suffix, // from -Xbootclasspath/a:... 398 _scp_nitems // the number of items, must be last. 399 }; 400 401 const char* _items[_scp_nitems]; 402 DEBUG_ONLY(bool _expansion_done;) 403 }; 404 405 SysClassPath::SysClassPath(const char* base) { 406 memset(_items, 0, sizeof(_items)); 407 _items[_scp_base] = base; 408 DEBUG_ONLY(_expansion_done = false;) 409 } 410 411 SysClassPath::~SysClassPath() { 412 // Free everything except the base. 413 for (int i = 0; i < _scp_nitems; ++i) { 414 if (i != _scp_base) reset_item_at(i); 415 } 416 DEBUG_ONLY(_expansion_done = false;) 417 } 418 419 inline void SysClassPath::set_base(const char* base) { 420 _items[_scp_base] = base; 421 } 422 423 inline void SysClassPath::add_prefix(const char* prefix) { 424 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 425 } 426 427 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 428 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 429 } 430 431 inline void SysClassPath::add_suffix(const char* suffix) { 432 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 433 } 434 435 inline void SysClassPath::reset_item_at(int index) { 436 assert(index < _scp_nitems && index != _scp_base, "just checking"); 437 if (_items[index] != NULL) { 438 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 439 _items[index] = NULL; 440 } 441 } 442 443 inline void SysClassPath::reset_path(const char* base) { 444 // Clear the prefix and suffix. 445 reset_item_at(_scp_prefix); 446 reset_item_at(_scp_suffix); 447 set_base(base); 448 } 449 450 //------------------------------------------------------------------------------ 451 452 void SysClassPath::expand_endorsed() { 453 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 454 455 const char* path = Arguments::get_property("java.endorsed.dirs"); 456 if (path == NULL) { 457 path = Arguments::get_endorsed_dir(); 458 assert(path != NULL, "no default for java.endorsed.dirs"); 459 } 460 461 char* expanded_path = NULL; 462 const char separator = *os::path_separator(); 463 const char* const end = path + strlen(path); 464 while (path < end) { 465 const char* tmp_end = strchr(path, separator); 466 if (tmp_end == NULL) { 467 expanded_path = add_jars_to_path(expanded_path, path); 468 path = end; 469 } else { 470 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 471 memcpy(dirpath, path, tmp_end - path); 472 dirpath[tmp_end - path] = '\0'; 473 expanded_path = add_jars_to_path(expanded_path, dirpath); 474 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 475 path = tmp_end + 1; 476 } 477 } 478 _items[_scp_endorsed] = expanded_path; 479 DEBUG_ONLY(_expansion_done = true;) 480 } 481 482 // Combine the bootclasspath elements, some of which may be null, into a single 483 // c-heap-allocated string. 484 char* SysClassPath::combined_path() { 485 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 486 assert(_expansion_done, "must call expand_endorsed() first."); 487 488 size_t lengths[_scp_nitems]; 489 size_t total_len = 0; 490 491 const char separator = *os::path_separator(); 492 493 // Get the lengths. 494 int i; 495 for (i = 0; i < _scp_nitems; ++i) { 496 if (_items[i] != NULL) { 497 lengths[i] = strlen(_items[i]); 498 // Include space for the separator char (or a NULL for the last item). 499 total_len += lengths[i] + 1; 500 } 501 } 502 assert(total_len > 0, "empty sysclasspath not allowed"); 503 504 // Copy the _items to a single string. 505 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 506 char* cp_tmp = cp; 507 for (i = 0; i < _scp_nitems; ++i) { 508 if (_items[i] != NULL) { 509 memcpy(cp_tmp, _items[i], lengths[i]); 510 cp_tmp += lengths[i]; 511 *cp_tmp++ = separator; 512 } 513 } 514 *--cp_tmp = '\0'; // Replace the extra separator. 515 return cp; 516 } 517 518 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 519 char* 520 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 521 char *cp; 522 523 assert(str != NULL, "just checking"); 524 if (path == NULL) { 525 size_t len = strlen(str) + 1; 526 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 527 memcpy(cp, str, len); // copy the trailing null 528 } else { 529 const char separator = *os::path_separator(); 530 size_t old_len = strlen(path); 531 size_t str_len = strlen(str); 532 size_t len = old_len + str_len + 2; 533 534 if (prepend) { 535 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 536 char* cp_tmp = cp; 537 memcpy(cp_tmp, str, str_len); 538 cp_tmp += str_len; 539 *cp_tmp = separator; 540 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 541 FREE_C_HEAP_ARRAY(char, path, mtInternal); 542 } else { 543 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 544 char* cp_tmp = cp + old_len; 545 *cp_tmp = separator; 546 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 547 } 548 } 549 return cp; 550 } 551 552 // Scan the directory and append any jar or zip files found to path. 553 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 554 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 555 DIR* dir = os::opendir(directory); 556 if (dir == NULL) return path; 557 558 char dir_sep[2] = { '\0', '\0' }; 559 size_t directory_len = strlen(directory); 560 const char fileSep = *os::file_separator(); 561 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 562 563 /* Scan the directory for jars/zips, appending them to path. */ 564 struct dirent *entry; 565 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 566 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 567 const char* name = entry->d_name; 568 const char* ext = name + strlen(name) - 4; 569 bool isJarOrZip = ext > name && 570 (os::file_name_strcmp(ext, ".jar") == 0 || 571 os::file_name_strcmp(ext, ".zip") == 0); 572 if (isJarOrZip) { 573 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 574 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 575 path = add_to_path(path, jarpath, false); 576 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 577 } 578 } 579 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 580 os::closedir(dir); 581 return path; 582 } 583 584 // Parses a memory size specification string. 585 static bool atomull(const char *s, julong* result) { 586 julong n = 0; 587 int args_read = 0; 588 bool is_hex = false; 589 // Skip leading 0[xX] for hexadecimal 590 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 591 s += 2; 592 is_hex = true; 593 args_read = sscanf(s, JULONG_FORMAT_X, &n); 594 } else { 595 args_read = sscanf(s, JULONG_FORMAT, &n); 596 } 597 if (args_read != 1) { 598 return false; 599 } 600 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 601 s++; 602 } 603 // 4705540: illegal if more characters are found after the first non-digit 604 if (strlen(s) > 1) { 605 return false; 606 } 607 switch (*s) { 608 case 'T': case 't': 609 *result = n * G * K; 610 // Check for overflow. 611 if (*result/((julong)G * K) != n) return false; 612 return true; 613 case 'G': case 'g': 614 *result = n * G; 615 if (*result/G != n) return false; 616 return true; 617 case 'M': case 'm': 618 *result = n * M; 619 if (*result/M != n) return false; 620 return true; 621 case 'K': case 'k': 622 *result = n * K; 623 if (*result/K != n) return false; 624 return true; 625 case '\0': 626 *result = n; 627 return true; 628 default: 629 return false; 630 } 631 } 632 633 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 634 if (size < min_size) return arg_too_small; 635 // Check that size will fit in a size_t (only relevant on 32-bit) 636 if (size > max_uintx) return arg_too_big; 637 return arg_in_range; 638 } 639 640 // Describe an argument out of range error 641 void Arguments::describe_range_error(ArgsRange errcode) { 642 switch(errcode) { 643 case arg_too_big: 644 jio_fprintf(defaultStream::error_stream(), 645 "The specified size exceeds the maximum " 646 "representable size.\n"); 647 break; 648 case arg_too_small: 649 case arg_unreadable: 650 case arg_in_range: 651 // do nothing for now 652 break; 653 default: 654 ShouldNotReachHere(); 655 } 656 } 657 658 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 659 return CommandLineFlags::boolAtPut(name, &value, origin); 660 } 661 662 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 663 double v; 664 if (sscanf(value, "%lf", &v) != 1) { 665 return false; 666 } 667 668 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 669 return true; 670 } 671 return false; 672 } 673 674 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 675 julong v; 676 intx intx_v; 677 bool is_neg = false; 678 // Check the sign first since atomull() parses only unsigned values. 679 if (*value == '-') { 680 if (!CommandLineFlags::intxAt(name, &intx_v)) { 681 return false; 682 } 683 value++; 684 is_neg = true; 685 } 686 if (!atomull(value, &v)) { 687 return false; 688 } 689 intx_v = (intx) v; 690 if (is_neg) { 691 intx_v = -intx_v; 692 } 693 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 694 return true; 695 } 696 uintx uintx_v = (uintx) v; 697 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 698 return true; 699 } 700 uint64_t uint64_t_v = (uint64_t) v; 701 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 702 return true; 703 } 704 return false; 705 } 706 707 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 708 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 709 // Contract: CommandLineFlags always returns a pointer that needs freeing. 710 FREE_C_HEAP_ARRAY(char, value, mtInternal); 711 return true; 712 } 713 714 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 715 const char* old_value = ""; 716 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 717 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 718 size_t new_len = strlen(new_value); 719 const char* value; 720 char* free_this_too = NULL; 721 if (old_len == 0) { 722 value = new_value; 723 } else if (new_len == 0) { 724 value = old_value; 725 } else { 726 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 727 // each new setting adds another LINE to the switch: 728 sprintf(buf, "%s\n%s", old_value, new_value); 729 value = buf; 730 free_this_too = buf; 731 } 732 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 733 // CommandLineFlags always returns a pointer that needs freeing. 734 FREE_C_HEAP_ARRAY(char, value, mtInternal); 735 if (free_this_too != NULL) { 736 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 737 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 738 } 739 return true; 740 } 741 742 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 743 744 // range of acceptable characters spelled out for portability reasons 745 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 746 #define BUFLEN 255 747 char name[BUFLEN+1]; 748 char dummy; 749 750 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 751 return set_bool_flag(name, false, origin); 752 } 753 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 754 return set_bool_flag(name, true, origin); 755 } 756 757 char punct; 758 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 759 const char* value = strchr(arg, '=') + 1; 760 Flag* flag = Flag::find_flag(name, strlen(name)); 761 if (flag != NULL && flag->is_ccstr()) { 762 if (flag->ccstr_accumulates()) { 763 return append_to_string_flag(name, value, origin); 764 } else { 765 if (value[0] == '\0') { 766 value = NULL; 767 } 768 return set_string_flag(name, value, origin); 769 } 770 } 771 } 772 773 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 774 const char* value = strchr(arg, '=') + 1; 775 // -XX:Foo:=xxx will reset the string flag to the given value. 776 if (value[0] == '\0') { 777 value = NULL; 778 } 779 return set_string_flag(name, value, origin); 780 } 781 782 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 783 #define SIGNED_NUMBER_RANGE "[-0123456789]" 784 #define NUMBER_RANGE "[0123456789]" 785 char value[BUFLEN + 1]; 786 char value2[BUFLEN + 1]; 787 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 788 // Looks like a floating-point number -- try again with more lenient format string 789 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 790 return set_fp_numeric_flag(name, value, origin); 791 } 792 } 793 794 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 795 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 796 return set_numeric_flag(name, value, origin); 797 } 798 799 return false; 800 } 801 802 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 803 assert(bldarray != NULL, "illegal argument"); 804 805 if (arg == NULL) { 806 return; 807 } 808 809 int new_count = *count + 1; 810 811 // expand the array and add arg to the last element 812 if (*bldarray == NULL) { 813 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 814 } else { 815 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 816 } 817 (*bldarray)[*count] = strdup(arg); 818 *count = new_count; 819 } 820 821 void Arguments::build_jvm_args(const char* arg) { 822 add_string(&_jvm_args_array, &_num_jvm_args, arg); 823 } 824 825 void Arguments::build_jvm_flags(const char* arg) { 826 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 827 } 828 829 // utility function to return a string that concatenates all 830 // strings in a given char** array 831 const char* Arguments::build_resource_string(char** args, int count) { 832 if (args == NULL || count == 0) { 833 return NULL; 834 } 835 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 836 for (int i = 1; i < count; i++) { 837 length += strlen(args[i]) + 1; // add 1 for a space 838 } 839 char* s = NEW_RESOURCE_ARRAY(char, length); 840 strcpy(s, args[0]); 841 for (int j = 1; j < count; j++) { 842 strcat(s, " "); 843 strcat(s, args[j]); 844 } 845 return (const char*) s; 846 } 847 848 void Arguments::print_on(outputStream* st) { 849 st->print_cr("VM Arguments:"); 850 if (num_jvm_flags() > 0) { 851 st->print("jvm_flags: "); print_jvm_flags_on(st); 852 } 853 if (num_jvm_args() > 0) { 854 st->print("jvm_args: "); print_jvm_args_on(st); 855 } 856 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 857 if (_java_class_path != NULL) { 858 char* path = _java_class_path->value(); 859 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 860 } 861 st->print_cr("Launcher Type: %s", _sun_java_launcher); 862 } 863 864 void Arguments::print_jvm_flags_on(outputStream* st) { 865 if (_num_jvm_flags > 0) { 866 for (int i=0; i < _num_jvm_flags; i++) { 867 st->print("%s ", _jvm_flags_array[i]); 868 } 869 st->cr(); 870 } 871 } 872 873 void Arguments::print_jvm_args_on(outputStream* st) { 874 if (_num_jvm_args > 0) { 875 for (int i=0; i < _num_jvm_args; i++) { 876 st->print("%s ", _jvm_args_array[i]); 877 } 878 st->cr(); 879 } 880 } 881 882 bool Arguments::process_argument(const char* arg, 883 jboolean ignore_unrecognized, Flag::Flags origin) { 884 885 JDK_Version since = JDK_Version(); 886 887 if (parse_argument(arg, origin) || ignore_unrecognized) { 888 return true; 889 } 890 891 bool has_plus_minus = (*arg == '+' || *arg == '-'); 892 const char* const argname = has_plus_minus ? arg + 1 : arg; 893 if (is_newly_obsolete(arg, &since)) { 894 char version[256]; 895 since.to_string(version, sizeof(version)); 896 warning("ignoring option %s; support was removed in %s", argname, version); 897 return true; 898 } 899 900 // For locked flags, report a custom error message if available. 901 // Otherwise, report the standard unrecognized VM option. 902 903 size_t arg_len; 904 const char* equal_sign = strchr(argname, '='); 905 if (equal_sign == NULL) { 906 arg_len = strlen(argname); 907 } else { 908 arg_len = equal_sign - argname; 909 } 910 911 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 912 if (found_flag != NULL) { 913 char locked_message_buf[BUFLEN]; 914 found_flag->get_locked_message(locked_message_buf, BUFLEN); 915 if (strlen(locked_message_buf) == 0) { 916 if (found_flag->is_bool() && !has_plus_minus) { 917 jio_fprintf(defaultStream::error_stream(), 918 "Missing +/- setting for VM option '%s'\n", argname); 919 } else if (!found_flag->is_bool() && has_plus_minus) { 920 jio_fprintf(defaultStream::error_stream(), 921 "Unexpected +/- setting in VM option '%s'\n", argname); 922 } else { 923 jio_fprintf(defaultStream::error_stream(), 924 "Improperly specified VM option '%s'\n", argname); 925 } 926 } else { 927 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 928 } 929 } else { 930 jio_fprintf(defaultStream::error_stream(), 931 "Unrecognized VM option '%s'\n", argname); 932 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 933 if (fuzzy_matched != NULL) { 934 jio_fprintf(defaultStream::error_stream(), 935 "Did you mean '%s%s%s'?\n", 936 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 937 fuzzy_matched->_name, 938 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 939 } 940 } 941 942 // allow for commandline "commenting out" options like -XX:#+Verbose 943 return arg[0] == '#'; 944 } 945 946 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 947 FILE* stream = fopen(file_name, "rb"); 948 if (stream == NULL) { 949 if (should_exist) { 950 jio_fprintf(defaultStream::error_stream(), 951 "Could not open settings file %s\n", file_name); 952 return false; 953 } else { 954 return true; 955 } 956 } 957 958 char token[1024]; 959 int pos = 0; 960 961 bool in_white_space = true; 962 bool in_comment = false; 963 bool in_quote = false; 964 char quote_c = 0; 965 bool result = true; 966 967 int c = getc(stream); 968 while(c != EOF && pos < (int)(sizeof(token)-1)) { 969 if (in_white_space) { 970 if (in_comment) { 971 if (c == '\n') in_comment = false; 972 } else { 973 if (c == '#') in_comment = true; 974 else if (!isspace(c)) { 975 in_white_space = false; 976 token[pos++] = c; 977 } 978 } 979 } else { 980 if (c == '\n' || (!in_quote && isspace(c))) { 981 // token ends at newline, or at unquoted whitespace 982 // this allows a way to include spaces in string-valued options 983 token[pos] = '\0'; 984 logOption(token); 985 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 986 build_jvm_flags(token); 987 pos = 0; 988 in_white_space = true; 989 in_quote = false; 990 } else if (!in_quote && (c == '\'' || c == '"')) { 991 in_quote = true; 992 quote_c = c; 993 } else if (in_quote && (c == quote_c)) { 994 in_quote = false; 995 } else { 996 token[pos++] = c; 997 } 998 } 999 c = getc(stream); 1000 } 1001 if (pos > 0) { 1002 token[pos] = '\0'; 1003 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1004 build_jvm_flags(token); 1005 } 1006 fclose(stream); 1007 return result; 1008 } 1009 1010 //============================================================================================================= 1011 // Parsing of properties (-D) 1012 1013 const char* Arguments::get_property(const char* key) { 1014 return PropertyList_get_value(system_properties(), key); 1015 } 1016 1017 bool Arguments::add_property(const char* prop) { 1018 const char* eq = strchr(prop, '='); 1019 char* key; 1020 // ns must be static--its address may be stored in a SystemProperty object. 1021 const static char ns[1] = {0}; 1022 char* value = (char *)ns; 1023 1024 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1025 key = AllocateHeap(key_len + 1, mtInternal); 1026 strncpy(key, prop, key_len); 1027 key[key_len] = '\0'; 1028 1029 if (eq != NULL) { 1030 size_t value_len = strlen(prop) - key_len - 1; 1031 value = AllocateHeap(value_len + 1, mtInternal); 1032 strncpy(value, &prop[key_len + 1], value_len + 1); 1033 } 1034 1035 if (strcmp(key, "java.compiler") == 0) { 1036 process_java_compiler_argument(value); 1037 FreeHeap(key); 1038 if (eq != NULL) { 1039 FreeHeap(value); 1040 } 1041 return true; 1042 } else if (strcmp(key, "sun.java.command") == 0) { 1043 _java_command = value; 1044 1045 // Record value in Arguments, but let it get passed to Java. 1046 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1047 strcmp(key, "sun.java.launcher.pid") == 0) { 1048 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1049 // private and are processed in process_sun_java_launcher_properties(); 1050 // the sun.java.launcher property is passed on to the java application 1051 FreeHeap(key); 1052 if (eq != NULL) { 1053 FreeHeap(value); 1054 } 1055 return true; 1056 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1057 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1058 // its value without going through the property list or making a Java call. 1059 _java_vendor_url_bug = value; 1060 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1061 PropertyList_unique_add(&_system_properties, key, value, true); 1062 return true; 1063 } 1064 // Create new property and add at the end of the list 1065 PropertyList_unique_add(&_system_properties, key, value); 1066 return true; 1067 } 1068 1069 //=========================================================================================================== 1070 // Setting int/mixed/comp mode flags 1071 1072 void Arguments::set_mode_flags(Mode mode) { 1073 // Set up default values for all flags. 1074 // If you add a flag to any of the branches below, 1075 // add a default value for it here. 1076 set_java_compiler(false); 1077 _mode = mode; 1078 1079 // Ensure Agent_OnLoad has the correct initial values. 1080 // This may not be the final mode; mode may change later in onload phase. 1081 PropertyList_unique_add(&_system_properties, "java.vm.info", 1082 (char*)VM_Version::vm_info_string(), false); 1083 1084 UseInterpreter = true; 1085 UseCompiler = true; 1086 UseLoopCounter = true; 1087 1088 #ifndef ZERO 1089 // Turn these off for mixed and comp. Leave them on for Zero. 1090 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1091 UseFastAccessorMethods = (mode == _int); 1092 } 1093 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1094 UseFastEmptyMethods = (mode == _int); 1095 } 1096 #endif 1097 1098 // Default values may be platform/compiler dependent - 1099 // use the saved values 1100 ClipInlining = Arguments::_ClipInlining; 1101 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1102 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1103 BackgroundCompilation = Arguments::_BackgroundCompilation; 1104 1105 // Change from defaults based on mode 1106 switch (mode) { 1107 default: 1108 ShouldNotReachHere(); 1109 break; 1110 case _int: 1111 UseCompiler = false; 1112 UseLoopCounter = false; 1113 AlwaysCompileLoopMethods = false; 1114 UseOnStackReplacement = false; 1115 break; 1116 case _mixed: 1117 // same as default 1118 break; 1119 case _comp: 1120 UseInterpreter = false; 1121 BackgroundCompilation = false; 1122 ClipInlining = false; 1123 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1124 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1125 // compile a level 4 (C2) and then continue executing it. 1126 if (TieredCompilation) { 1127 Tier3InvokeNotifyFreqLog = 0; 1128 Tier4InvocationThreshold = 0; 1129 } 1130 break; 1131 } 1132 } 1133 1134 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1135 // Conflict: required to use shared spaces (-Xshare:on), but 1136 // incompatible command line options were chosen. 1137 1138 static void no_shared_spaces() { 1139 if (RequireSharedSpaces) { 1140 jio_fprintf(defaultStream::error_stream(), 1141 "Class data sharing is inconsistent with other specified options.\n"); 1142 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1143 } else { 1144 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1145 } 1146 } 1147 #endif 1148 1149 void Arguments::set_tiered_flags() { 1150 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1151 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1152 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1153 } 1154 if (CompilationPolicyChoice < 2) { 1155 vm_exit_during_initialization( 1156 "Incompatible compilation policy selected", NULL); 1157 } 1158 // Increase the code cache size - tiered compiles a lot more. 1159 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1160 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1161 } 1162 if (!UseInterpreter) { // -Xcomp 1163 Tier3InvokeNotifyFreqLog = 0; 1164 Tier4InvocationThreshold = 0; 1165 } 1166 } 1167 1168 /** 1169 * Returns the minimum number of compiler threads needed to run the JVM. The following 1170 * configurations are possible. 1171 * 1172 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1173 * compiler threads is 0. 1174 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1175 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1176 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1177 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1178 * C1 can be used, so the minimum number of compiler threads is 1. 1179 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1180 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1181 * the minimum number of compiler threads is 2. 1182 */ 1183 int Arguments::get_min_number_of_compiler_threads() { 1184 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1185 return 0; // case 1 1186 #else 1187 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1188 return 1; // case 2 or case 3 1189 } 1190 return 2; // case 4 (tiered) 1191 #endif 1192 } 1193 1194 #if INCLUDE_ALL_GCS 1195 static void disable_adaptive_size_policy(const char* collector_name) { 1196 if (UseAdaptiveSizePolicy) { 1197 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1198 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1199 collector_name); 1200 } 1201 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1202 } 1203 } 1204 1205 void Arguments::set_parnew_gc_flags() { 1206 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1207 "control point invariant"); 1208 assert(UseParNewGC, "Error"); 1209 1210 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1211 disable_adaptive_size_policy("UseParNewGC"); 1212 1213 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1214 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1215 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1216 } else if (ParallelGCThreads == 0) { 1217 jio_fprintf(defaultStream::error_stream(), 1218 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1219 vm_exit(1); 1220 } 1221 1222 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1223 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1224 // we set them to 1024 and 1024. 1225 // See CR 6362902. 1226 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1227 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1228 } 1229 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1230 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1231 } 1232 1233 // When using compressed oops, we use local overflow stacks, 1234 // rather than using a global overflow list chained through 1235 // the klass word of the object's pre-image. 1236 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1237 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1238 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1239 } 1240 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1241 } 1242 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1243 } 1244 1245 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1246 // sparc/solaris for certain applications, but would gain from 1247 // further optimization and tuning efforts, and would almost 1248 // certainly gain from analysis of platform and environment. 1249 void Arguments::set_cms_and_parnew_gc_flags() { 1250 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1251 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1252 1253 // If we are using CMS, we prefer to UseParNewGC, 1254 // unless explicitly forbidden. 1255 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1256 FLAG_SET_ERGO(bool, UseParNewGC, true); 1257 } 1258 1259 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1260 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1261 1262 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1263 // as needed. 1264 if (UseParNewGC) { 1265 set_parnew_gc_flags(); 1266 } 1267 1268 size_t max_heap = align_size_down(MaxHeapSize, 1269 CardTableRS::ct_max_alignment_constraint()); 1270 1271 // Now make adjustments for CMS 1272 intx tenuring_default = (intx)6; 1273 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1274 1275 // Preferred young gen size for "short" pauses: 1276 // upper bound depends on # of threads and NewRatio. 1277 const uintx parallel_gc_threads = 1278 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1279 const size_t preferred_max_new_size_unaligned = 1280 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1281 size_t preferred_max_new_size = 1282 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1283 1284 // Unless explicitly requested otherwise, size young gen 1285 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1286 1287 // If either MaxNewSize or NewRatio is set on the command line, 1288 // assume the user is trying to set the size of the young gen. 1289 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1290 1291 // Set MaxNewSize to our calculated preferred_max_new_size unless 1292 // NewSize was set on the command line and it is larger than 1293 // preferred_max_new_size. 1294 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1295 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1296 } else { 1297 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1298 } 1299 if (PrintGCDetails && Verbose) { 1300 // Too early to use gclog_or_tty 1301 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1302 } 1303 1304 // Code along this path potentially sets NewSize and OldSize 1305 if (PrintGCDetails && Verbose) { 1306 // Too early to use gclog_or_tty 1307 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1308 " initial_heap_size: " SIZE_FORMAT 1309 " max_heap: " SIZE_FORMAT, 1310 min_heap_size(), InitialHeapSize, max_heap); 1311 } 1312 size_t min_new = preferred_max_new_size; 1313 if (FLAG_IS_CMDLINE(NewSize)) { 1314 min_new = NewSize; 1315 } 1316 if (max_heap > min_new && min_heap_size() > min_new) { 1317 // Unless explicitly requested otherwise, make young gen 1318 // at least min_new, and at most preferred_max_new_size. 1319 if (FLAG_IS_DEFAULT(NewSize)) { 1320 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1321 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1322 if (PrintGCDetails && Verbose) { 1323 // Too early to use gclog_or_tty 1324 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1325 } 1326 } 1327 // Unless explicitly requested otherwise, size old gen 1328 // so it's NewRatio x of NewSize. 1329 if (FLAG_IS_DEFAULT(OldSize)) { 1330 if (max_heap > NewSize) { 1331 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1332 if (PrintGCDetails && Verbose) { 1333 // Too early to use gclog_or_tty 1334 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1335 } 1336 } 1337 } 1338 } 1339 } 1340 // Unless explicitly requested otherwise, definitely 1341 // promote all objects surviving "tenuring_default" scavenges. 1342 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1343 FLAG_IS_DEFAULT(SurvivorRatio)) { 1344 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1345 } 1346 // If we decided above (or user explicitly requested) 1347 // `promote all' (via MaxTenuringThreshold := 0), 1348 // prefer minuscule survivor spaces so as not to waste 1349 // space for (non-existent) survivors 1350 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1351 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1352 } 1353 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1354 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1355 // This is done in order to make ParNew+CMS configuration to work 1356 // with YoungPLABSize and OldPLABSize options. 1357 // See CR 6362902. 1358 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1359 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1360 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1361 // is. In this situation let CMSParPromoteBlocksToClaim follow 1362 // the value (either from the command line or ergonomics) of 1363 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1364 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1365 } else { 1366 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1367 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1368 // we'll let it to take precedence. 1369 jio_fprintf(defaultStream::error_stream(), 1370 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1371 " options are specified for the CMS collector." 1372 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1373 } 1374 } 1375 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1376 // OldPLAB sizing manually turned off: Use a larger default setting, 1377 // unless it was manually specified. This is because a too-low value 1378 // will slow down scavenges. 1379 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1380 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1381 } 1382 } 1383 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1384 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1385 // If either of the static initialization defaults have changed, note this 1386 // modification. 1387 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1388 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1389 } 1390 if (PrintGCDetails && Verbose) { 1391 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1392 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1393 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1394 } 1395 } 1396 #endif // INCLUDE_ALL_GCS 1397 1398 void set_object_alignment() { 1399 // Object alignment. 1400 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1401 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1402 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1403 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1404 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1405 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1406 1407 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1408 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1409 1410 // Oop encoding heap max 1411 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1412 1413 #if INCLUDE_ALL_GCS 1414 // Set CMS global values 1415 CompactibleFreeListSpace::set_cms_values(); 1416 #endif // INCLUDE_ALL_GCS 1417 } 1418 1419 bool verify_object_alignment() { 1420 // Object alignment. 1421 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1422 jio_fprintf(defaultStream::error_stream(), 1423 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1424 (int)ObjectAlignmentInBytes); 1425 return false; 1426 } 1427 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1428 jio_fprintf(defaultStream::error_stream(), 1429 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1430 (int)ObjectAlignmentInBytes, BytesPerLong); 1431 return false; 1432 } 1433 // It does not make sense to have big object alignment 1434 // since a space lost due to alignment will be greater 1435 // then a saved space from compressed oops. 1436 if ((int)ObjectAlignmentInBytes > 256) { 1437 jio_fprintf(defaultStream::error_stream(), 1438 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1439 (int)ObjectAlignmentInBytes); 1440 return false; 1441 } 1442 // In case page size is very small. 1443 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1444 jio_fprintf(defaultStream::error_stream(), 1445 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1446 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1447 return false; 1448 } 1449 return true; 1450 } 1451 1452 size_t Arguments::max_heap_for_compressed_oops() { 1453 // Avoid sign flip. 1454 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1455 // We need to fit both the NULL page and the heap into the memory budget, while 1456 // keeping alignment constraints of the heap. To guarantee the latter, as the 1457 // NULL page is located before the heap, we pad the NULL page to the conservative 1458 // maximum alignment that the GC may ever impose upon the heap. 1459 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1460 _conservative_max_heap_alignment); 1461 1462 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1463 NOT_LP64(ShouldNotReachHere(); return 0); 1464 } 1465 1466 bool Arguments::should_auto_select_low_pause_collector() { 1467 if (UseAutoGCSelectPolicy && 1468 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1469 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1470 if (PrintGCDetails) { 1471 // Cannot use gclog_or_tty yet. 1472 tty->print_cr("Automatic selection of the low pause collector" 1473 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1474 } 1475 return true; 1476 } 1477 return false; 1478 } 1479 1480 void Arguments::set_use_compressed_oops() { 1481 #ifndef ZERO 1482 #ifdef _LP64 1483 // MaxHeapSize is not set up properly at this point, but 1484 // the only value that can override MaxHeapSize if we are 1485 // to use UseCompressedOops is InitialHeapSize. 1486 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1487 1488 if (max_heap_size <= max_heap_for_compressed_oops()) { 1489 #if !defined(COMPILER1) || defined(TIERED) 1490 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1491 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1492 } 1493 #endif 1494 #ifdef _WIN64 1495 if (UseLargePages && UseCompressedOops) { 1496 // Cannot allocate guard pages for implicit checks in indexed addressing 1497 // mode, when large pages are specified on windows. 1498 // This flag could be switched ON if narrow oop base address is set to 0, 1499 // see code in Universe::initialize_heap(). 1500 Universe::set_narrow_oop_use_implicit_null_checks(false); 1501 } 1502 #endif // _WIN64 1503 } else { 1504 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1505 warning("Max heap size too large for Compressed Oops"); 1506 FLAG_SET_DEFAULT(UseCompressedOops, false); 1507 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1508 } 1509 } 1510 #endif // _LP64 1511 #endif // ZERO 1512 } 1513 1514 1515 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1516 // set_use_compressed_oops(). 1517 void Arguments::set_use_compressed_klass_ptrs() { 1518 #ifndef ZERO 1519 #ifdef _LP64 1520 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1521 if (!UseCompressedOops) { 1522 if (UseCompressedClassPointers) { 1523 warning("UseCompressedClassPointers requires UseCompressedOops"); 1524 } 1525 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1526 } else { 1527 // Turn on UseCompressedClassPointers too 1528 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1529 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1530 } 1531 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1532 if (UseCompressedClassPointers) { 1533 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1534 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1535 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1536 } 1537 } 1538 } 1539 #endif // _LP64 1540 #endif // !ZERO 1541 } 1542 1543 void Arguments::set_conservative_max_heap_alignment() { 1544 // The conservative maximum required alignment for the heap is the maximum of 1545 // the alignments imposed by several sources: any requirements from the heap 1546 // itself, the collector policy and the maximum page size we may run the VM 1547 // with. 1548 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1549 #if INCLUDE_ALL_GCS 1550 if (UseParallelGC) { 1551 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1552 } else if (UseG1GC) { 1553 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1554 } 1555 #endif // INCLUDE_ALL_GCS 1556 _conservative_max_heap_alignment = MAX3(heap_alignment, os::max_page_size(), 1557 CollectorPolicy::compute_heap_alignment()); 1558 } 1559 1560 void Arguments::set_ergonomics_flags() { 1561 1562 if (os::is_server_class_machine()) { 1563 // If no other collector is requested explicitly, 1564 // let the VM select the collector based on 1565 // machine class and automatic selection policy. 1566 if (!UseSerialGC && 1567 !UseConcMarkSweepGC && 1568 !UseG1GC && 1569 !UseParNewGC && 1570 FLAG_IS_DEFAULT(UseParallelGC)) { 1571 if (should_auto_select_low_pause_collector()) { 1572 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1573 } else { 1574 FLAG_SET_ERGO(bool, UseParallelGC, true); 1575 } 1576 } 1577 } 1578 #ifdef COMPILER2 1579 // Shared spaces work fine with other GCs but causes bytecode rewriting 1580 // to be disabled, which hurts interpreter performance and decreases 1581 // server performance. When -server is specified, keep the default off 1582 // unless it is asked for. Future work: either add bytecode rewriting 1583 // at link time, or rewrite bytecodes in non-shared methods. 1584 if (!DumpSharedSpaces && !RequireSharedSpaces && 1585 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1586 no_shared_spaces(); 1587 } 1588 #endif 1589 1590 set_conservative_max_heap_alignment(); 1591 1592 #ifndef ZERO 1593 #ifdef _LP64 1594 set_use_compressed_oops(); 1595 1596 // set_use_compressed_klass_ptrs() must be called after calling 1597 // set_use_compressed_oops(). 1598 set_use_compressed_klass_ptrs(); 1599 1600 // Also checks that certain machines are slower with compressed oops 1601 // in vm_version initialization code. 1602 #endif // _LP64 1603 #endif // !ZERO 1604 } 1605 1606 void Arguments::set_parallel_gc_flags() { 1607 assert(UseParallelGC || UseParallelOldGC, "Error"); 1608 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1609 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1610 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1611 } 1612 FLAG_SET_DEFAULT(UseParallelGC, true); 1613 1614 // If no heap maximum was requested explicitly, use some reasonable fraction 1615 // of the physical memory, up to a maximum of 1GB. 1616 FLAG_SET_DEFAULT(ParallelGCThreads, 1617 Abstract_VM_Version::parallel_worker_threads()); 1618 if (ParallelGCThreads == 0) { 1619 jio_fprintf(defaultStream::error_stream(), 1620 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1621 vm_exit(1); 1622 } 1623 1624 if (UseAdaptiveSizePolicy) { 1625 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1626 // unless the user actually sets these flags. 1627 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1628 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1629 } 1630 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1631 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1632 } 1633 } 1634 1635 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1636 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1637 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1638 // See CR 6362902 for details. 1639 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1640 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1641 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1642 } 1643 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1644 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1645 } 1646 } 1647 1648 if (UseParallelOldGC) { 1649 // Par compact uses lower default values since they are treated as 1650 // minimums. These are different defaults because of the different 1651 // interpretation and are not ergonomically set. 1652 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1653 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1654 } 1655 } 1656 } 1657 1658 void Arguments::set_g1_gc_flags() { 1659 assert(UseG1GC, "Error"); 1660 #ifdef COMPILER1 1661 FastTLABRefill = false; 1662 #endif 1663 FLAG_SET_DEFAULT(ParallelGCThreads, 1664 Abstract_VM_Version::parallel_worker_threads()); 1665 if (ParallelGCThreads == 0) { 1666 FLAG_SET_DEFAULT(ParallelGCThreads, 1667 Abstract_VM_Version::parallel_worker_threads()); 1668 } 1669 1670 // MarkStackSize will be set (if it hasn't been set by the user) 1671 // when concurrent marking is initialized. 1672 // Its value will be based upon the number of parallel marking threads. 1673 // But we do set the maximum mark stack size here. 1674 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1675 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1676 } 1677 1678 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1679 // In G1, we want the default GC overhead goal to be higher than 1680 // say in PS. So we set it here to 10%. Otherwise the heap might 1681 // be expanded more aggressively than we would like it to. In 1682 // fact, even 10% seems to not be high enough in some cases 1683 // (especially small GC stress tests that the main thing they do 1684 // is allocation). We might consider increase it further. 1685 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1686 } 1687 1688 if (PrintGCDetails && Verbose) { 1689 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1690 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1691 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1692 } 1693 } 1694 1695 julong Arguments::limit_by_allocatable_memory(julong limit) { 1696 julong max_allocatable; 1697 julong result = limit; 1698 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1699 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1700 } 1701 return result; 1702 } 1703 1704 // Use static initialization to get the default before parsing 1705 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1706 1707 void Arguments::set_heap_size() { 1708 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1709 // Deprecated flag 1710 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1711 } 1712 1713 const julong phys_mem = 1714 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1715 : (julong)MaxRAM; 1716 1717 // If the maximum heap size has not been set with -Xmx, 1718 // then set it as fraction of the size of physical memory, 1719 // respecting the maximum and minimum sizes of the heap. 1720 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1721 julong reasonable_max = phys_mem / MaxRAMFraction; 1722 1723 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1724 // Small physical memory, so use a minimum fraction of it for the heap 1725 reasonable_max = phys_mem / MinRAMFraction; 1726 } else { 1727 // Not-small physical memory, so require a heap at least 1728 // as large as MaxHeapSize 1729 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1730 } 1731 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1732 // Limit the heap size to ErgoHeapSizeLimit 1733 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1734 } 1735 if (UseCompressedOops) { 1736 // Limit the heap size to the maximum possible when using compressed oops 1737 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1738 1739 // HeapBaseMinAddress can be greater than default but not less than. 1740 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1741 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1742 // matches compressed oops printing flags 1743 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1744 jio_fprintf(defaultStream::error_stream(), 1745 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1746 " (" UINTX_FORMAT "G) which is greater than value given " 1747 UINTX_FORMAT "\n", 1748 DefaultHeapBaseMinAddress, 1749 DefaultHeapBaseMinAddress/G, 1750 HeapBaseMinAddress); 1751 } 1752 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1753 } 1754 } 1755 1756 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1757 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1758 // but it should be not less than default MaxHeapSize. 1759 max_coop_heap -= HeapBaseMinAddress; 1760 } 1761 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1762 } 1763 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1764 1765 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1766 // An initial heap size was specified on the command line, 1767 // so be sure that the maximum size is consistent. Done 1768 // after call to limit_by_allocatable_memory because that 1769 // method might reduce the allocation size. 1770 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1771 } 1772 1773 if (PrintGCDetails && Verbose) { 1774 // Cannot use gclog_or_tty yet. 1775 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1776 } 1777 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1778 } 1779 1780 // If the minimum or initial heap_size have not been set or requested to be set 1781 // ergonomically, set them accordingly. 1782 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1783 julong reasonable_minimum = (julong)(OldSize + NewSize); 1784 1785 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1786 1787 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1788 1789 if (InitialHeapSize == 0) { 1790 julong reasonable_initial = phys_mem / InitialRAMFraction; 1791 1792 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1793 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1794 1795 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1796 1797 if (PrintGCDetails && Verbose) { 1798 // Cannot use gclog_or_tty yet. 1799 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1800 } 1801 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1802 } 1803 // If the minimum heap size has not been set (via -Xms), 1804 // synchronize with InitialHeapSize to avoid errors with the default value. 1805 if (min_heap_size() == 0) { 1806 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1807 if (PrintGCDetails && Verbose) { 1808 // Cannot use gclog_or_tty yet. 1809 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1810 } 1811 } 1812 } 1813 } 1814 1815 // This must be called after ergonomics because we want bytecode rewriting 1816 // if the server compiler is used, or if UseSharedSpaces is disabled. 1817 void Arguments::set_bytecode_flags() { 1818 // Better not attempt to store into a read-only space. 1819 if (UseSharedSpaces) { 1820 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1821 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1822 } 1823 1824 if (!RewriteBytecodes) { 1825 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1826 } 1827 } 1828 1829 // Aggressive optimization flags -XX:+AggressiveOpts 1830 void Arguments::set_aggressive_opts_flags() { 1831 #ifdef COMPILER2 1832 if (AggressiveUnboxing) { 1833 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1834 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1835 } else if (!EliminateAutoBox) { 1836 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1837 AggressiveUnboxing = false; 1838 } 1839 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1840 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1841 } else if (!DoEscapeAnalysis) { 1842 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1843 AggressiveUnboxing = false; 1844 } 1845 } 1846 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1847 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1848 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1849 } 1850 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1851 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1852 } 1853 1854 // Feed the cache size setting into the JDK 1855 char buffer[1024]; 1856 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1857 add_property(buffer); 1858 } 1859 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1860 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1861 } 1862 #endif 1863 1864 if (AggressiveOpts) { 1865 // Sample flag setting code 1866 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1867 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1868 // } 1869 } 1870 } 1871 1872 //=========================================================================================================== 1873 // Parsing of java.compiler property 1874 1875 void Arguments::process_java_compiler_argument(char* arg) { 1876 // For backwards compatibility, Djava.compiler=NONE or "" 1877 // causes us to switch to -Xint mode UNLESS -Xdebug 1878 // is also specified. 1879 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1880 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1881 } 1882 } 1883 1884 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1885 _sun_java_launcher = strdup(launcher); 1886 } 1887 1888 bool Arguments::created_by_java_launcher() { 1889 assert(_sun_java_launcher != NULL, "property must have value"); 1890 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1891 } 1892 1893 bool Arguments::sun_java_launcher_is_altjvm() { 1894 return _sun_java_launcher_is_altjvm; 1895 } 1896 1897 //=========================================================================================================== 1898 // Parsing of main arguments 1899 1900 bool Arguments::verify_interval(uintx val, uintx min, 1901 uintx max, const char* name) { 1902 // Returns true iff value is in the inclusive interval [min..max] 1903 // false, otherwise. 1904 if (val >= min && val <= max) { 1905 return true; 1906 } 1907 jio_fprintf(defaultStream::error_stream(), 1908 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1909 " and " UINTX_FORMAT "\n", 1910 name, val, min, max); 1911 return false; 1912 } 1913 1914 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1915 // Returns true if given value is at least specified min threshold 1916 // false, otherwise. 1917 if (val >= min ) { 1918 return true; 1919 } 1920 jio_fprintf(defaultStream::error_stream(), 1921 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1922 name, val, min); 1923 return false; 1924 } 1925 1926 bool Arguments::verify_percentage(uintx value, const char* name) { 1927 if (is_percentage(value)) { 1928 return true; 1929 } 1930 jio_fprintf(defaultStream::error_stream(), 1931 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1932 name, value); 1933 return false; 1934 } 1935 1936 #if !INCLUDE_ALL_GCS 1937 #ifdef ASSERT 1938 static bool verify_serial_gc_flags() { 1939 return (UseSerialGC && 1940 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1941 UseParallelGC || UseParallelOldGC)); 1942 } 1943 #endif // ASSERT 1944 #endif // INCLUDE_ALL_GCS 1945 1946 // check if do gclog rotation 1947 // +UseGCLogFileRotation is a must, 1948 // no gc log rotation when log file not supplied or 1949 // NumberOfGCLogFiles is 0 1950 void check_gclog_consistency() { 1951 if (UseGCLogFileRotation) { 1952 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1953 jio_fprintf(defaultStream::output_stream(), 1954 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1955 "where num_of_file > 0\n" 1956 "GC log rotation is turned off\n"); 1957 UseGCLogFileRotation = false; 1958 } 1959 } 1960 1961 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1962 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1963 jio_fprintf(defaultStream::output_stream(), 1964 "GCLogFileSize changed to minimum 8K\n"); 1965 } 1966 } 1967 1968 // This function is called for -Xloggc:<filename>, it can be used 1969 // to check if a given file name(or string) conforms to the following 1970 // specification: 1971 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1972 // %p and %t only allowed once. We only limit usage of filename not path 1973 bool is_filename_valid(const char *file_name) { 1974 const char* p = file_name; 1975 char file_sep = os::file_separator()[0]; 1976 const char* cp; 1977 // skip prefix path 1978 for (cp = file_name; *cp != '\0'; cp++) { 1979 if (*cp == '/' || *cp == file_sep) { 1980 p = cp + 1; 1981 } 1982 } 1983 1984 int count_p = 0; 1985 int count_t = 0; 1986 while (*p != '\0') { 1987 if ((*p >= '0' && *p <= '9') || 1988 (*p >= 'A' && *p <= 'Z') || 1989 (*p >= 'a' && *p <= 'z') || 1990 *p == '-' || 1991 *p == '_' || 1992 *p == '.') { 1993 p++; 1994 continue; 1995 } 1996 if (*p == '%') { 1997 if(*(p + 1) == 'p') { 1998 p += 2; 1999 count_p ++; 2000 continue; 2001 } 2002 if (*(p + 1) == 't') { 2003 p += 2; 2004 count_t ++; 2005 continue; 2006 } 2007 } 2008 return false; 2009 } 2010 return count_p < 2 && count_t < 2; 2011 } 2012 2013 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2014 if (!is_percentage(min_heap_free_ratio)) { 2015 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2016 return false; 2017 } 2018 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2019 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2020 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2021 MaxHeapFreeRatio); 2022 return false; 2023 } 2024 return true; 2025 } 2026 2027 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2028 if (!is_percentage(max_heap_free_ratio)) { 2029 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2030 return false; 2031 } 2032 if (max_heap_free_ratio < MinHeapFreeRatio) { 2033 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2034 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2035 MinHeapFreeRatio); 2036 return false; 2037 } 2038 return true; 2039 } 2040 2041 // Check consistency of GC selection 2042 bool Arguments::check_gc_consistency() { 2043 check_gclog_consistency(); 2044 bool status = true; 2045 // Ensure that the user has not selected conflicting sets 2046 // of collectors. [Note: this check is merely a user convenience; 2047 // collectors over-ride each other so that only a non-conflicting 2048 // set is selected; however what the user gets is not what they 2049 // may have expected from the combination they asked for. It's 2050 // better to reduce user confusion by not allowing them to 2051 // select conflicting combinations. 2052 uint i = 0; 2053 if (UseSerialGC) i++; 2054 if (UseConcMarkSweepGC || UseParNewGC) i++; 2055 if (UseParallelGC || UseParallelOldGC) i++; 2056 if (UseG1GC) i++; 2057 if (i > 1) { 2058 jio_fprintf(defaultStream::error_stream(), 2059 "Conflicting collector combinations in option list; " 2060 "please refer to the release notes for the combinations " 2061 "allowed\n"); 2062 status = false; 2063 } 2064 return status; 2065 } 2066 2067 void Arguments::check_deprecated_gcs() { 2068 if (UseConcMarkSweepGC && !UseParNewGC) { 2069 warning("Using the DefNew young collector with the CMS collector is deprecated " 2070 "and will likely be removed in a future release"); 2071 } 2072 2073 if (UseParNewGC && !UseConcMarkSweepGC) { 2074 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2075 // set up UseSerialGC properly, so that can't be used in the check here. 2076 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2077 "and will likely be removed in a future release"); 2078 } 2079 2080 if (CMSIncrementalMode) { 2081 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2082 } 2083 } 2084 2085 void Arguments::check_deprecated_gc_flags() { 2086 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2087 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2088 "and will likely be removed in future release"); 2089 } 2090 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2091 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2092 "Use MaxRAMFraction instead."); 2093 } 2094 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2095 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2096 } 2097 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2098 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2099 } 2100 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2101 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2102 } 2103 } 2104 2105 // Check stack pages settings 2106 bool Arguments::check_stack_pages() 2107 { 2108 bool status = true; 2109 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2110 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2111 // greater stack shadow pages can't generate instruction to bang stack 2112 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2113 return status; 2114 } 2115 2116 // Check the consistency of vm_init_args 2117 bool Arguments::check_vm_args_consistency() { 2118 // Method for adding checks for flag consistency. 2119 // The intent is to warn the user of all possible conflicts, 2120 // before returning an error. 2121 // Note: Needs platform-dependent factoring. 2122 bool status = true; 2123 2124 if (TLABRefillWasteFraction == 0) { 2125 jio_fprintf(defaultStream::error_stream(), 2126 "TLABRefillWasteFraction should be a denominator, " 2127 "not " SIZE_FORMAT "\n", 2128 TLABRefillWasteFraction); 2129 status = false; 2130 } 2131 2132 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2133 "AdaptiveSizePolicyWeight"); 2134 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2135 2136 // Divide by bucket size to prevent a large size from causing rollover when 2137 // calculating amount of memory needed to be allocated for the String table. 2138 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2139 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2140 2141 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2142 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2143 2144 { 2145 // Using "else if" below to avoid printing two error messages if min > max. 2146 // This will also prevent us from reporting both min>100 and max>100 at the 2147 // same time, but that is less annoying than printing two identical errors IMHO. 2148 FormatBuffer<80> err_msg("%s",""); 2149 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2150 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2151 status = false; 2152 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2153 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2154 status = false; 2155 } 2156 } 2157 2158 // Min/MaxMetaspaceFreeRatio 2159 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2160 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2161 2162 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2163 jio_fprintf(defaultStream::error_stream(), 2164 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2165 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2166 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2167 MinMetaspaceFreeRatio, 2168 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2169 MaxMetaspaceFreeRatio); 2170 status = false; 2171 } 2172 2173 // Trying to keep 100% free is not practical 2174 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2175 2176 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2177 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2178 } 2179 2180 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2181 // Settings to encourage splitting. 2182 if (!FLAG_IS_CMDLINE(NewRatio)) { 2183 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2184 } 2185 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2186 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2187 } 2188 } 2189 2190 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2191 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2192 if (GCTimeLimit == 100) { 2193 // Turn off gc-overhead-limit-exceeded checks 2194 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2195 } 2196 2197 status = status && check_gc_consistency(); 2198 status = status && check_stack_pages(); 2199 2200 if (CMSIncrementalMode) { 2201 if (!UseConcMarkSweepGC) { 2202 jio_fprintf(defaultStream::error_stream(), 2203 "error: invalid argument combination.\n" 2204 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2205 "selected in order\nto use CMSIncrementalMode.\n"); 2206 status = false; 2207 } else { 2208 status = status && verify_percentage(CMSIncrementalDutyCycle, 2209 "CMSIncrementalDutyCycle"); 2210 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2211 "CMSIncrementalDutyCycleMin"); 2212 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2213 "CMSIncrementalSafetyFactor"); 2214 status = status && verify_percentage(CMSIncrementalOffset, 2215 "CMSIncrementalOffset"); 2216 status = status && verify_percentage(CMSExpAvgFactor, 2217 "CMSExpAvgFactor"); 2218 // If it was not set on the command line, set 2219 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2220 if (CMSInitiatingOccupancyFraction < 0) { 2221 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2222 } 2223 } 2224 } 2225 2226 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2227 // insists that we hold the requisite locks so that the iteration is 2228 // MT-safe. For the verification at start-up and shut-down, we don't 2229 // yet have a good way of acquiring and releasing these locks, 2230 // which are not visible at the CollectedHeap level. We want to 2231 // be able to acquire these locks and then do the iteration rather 2232 // than just disable the lock verification. This will be fixed under 2233 // bug 4788986. 2234 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2235 if (VerifyDuringStartup) { 2236 warning("Heap verification at start-up disabled " 2237 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2238 VerifyDuringStartup = false; // Disable verification at start-up 2239 } 2240 2241 if (VerifyBeforeExit) { 2242 warning("Heap verification at shutdown disabled " 2243 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2244 VerifyBeforeExit = false; // Disable verification at shutdown 2245 } 2246 } 2247 2248 // Note: only executed in non-PRODUCT mode 2249 if (!UseAsyncConcMarkSweepGC && 2250 (ExplicitGCInvokesConcurrent || 2251 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2252 jio_fprintf(defaultStream::error_stream(), 2253 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2254 " with -UseAsyncConcMarkSweepGC"); 2255 status = false; 2256 } 2257 2258 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2259 2260 #if INCLUDE_ALL_GCS 2261 if (UseG1GC) { 2262 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2263 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2264 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2265 2266 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2267 "InitiatingHeapOccupancyPercent"); 2268 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2269 "G1RefProcDrainInterval"); 2270 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2271 "G1ConcMarkStepDurationMillis"); 2272 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2273 "G1ConcRSHotCardLimit"); 2274 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2275 "G1ConcRSLogCacheSize"); 2276 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2277 "StringDeduplicationAgeThreshold"); 2278 } 2279 if (UseConcMarkSweepGC) { 2280 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2281 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2282 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2283 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2284 2285 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2286 2287 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2288 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2289 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2290 2291 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2292 2293 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2294 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2295 2296 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2297 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2298 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2299 2300 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2301 2302 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2303 2304 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2305 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2306 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2307 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2308 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2309 } 2310 2311 if (UseParallelGC || UseParallelOldGC) { 2312 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2313 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2314 2315 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2316 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2317 2318 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2319 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2320 2321 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2322 2323 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2324 } 2325 #endif // INCLUDE_ALL_GCS 2326 2327 status = status && verify_interval(RefDiscoveryPolicy, 2328 ReferenceProcessor::DiscoveryPolicyMin, 2329 ReferenceProcessor::DiscoveryPolicyMax, 2330 "RefDiscoveryPolicy"); 2331 2332 // Limit the lower bound of this flag to 1 as it is used in a division 2333 // expression. 2334 status = status && verify_interval(TLABWasteTargetPercent, 2335 1, 100, "TLABWasteTargetPercent"); 2336 2337 status = status && verify_object_alignment(); 2338 2339 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2340 "CompressedClassSpaceSize"); 2341 2342 status = status && verify_interval(MarkStackSizeMax, 2343 1, (max_jint - 1), "MarkStackSizeMax"); 2344 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2345 2346 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2347 2348 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2349 2350 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2351 2352 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2353 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2354 2355 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2356 2357 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2358 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2359 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2360 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2361 2362 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2363 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2364 2365 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2366 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2367 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2368 2369 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2370 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2371 2372 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2373 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2374 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2375 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2376 2377 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2378 #ifdef COMPILER1 2379 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2380 #endif 2381 2382 if (PrintNMTStatistics) { 2383 #if INCLUDE_NMT 2384 if (MemTracker::tracking_level() == MemTracker::NMT_off) { 2385 #endif // INCLUDE_NMT 2386 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2387 PrintNMTStatistics = false; 2388 #if INCLUDE_NMT 2389 } 2390 #endif 2391 } 2392 2393 // Need to limit the extent of the padding to reasonable size. 2394 // 8K is well beyond the reasonable HW cache line size, even with the 2395 // aggressive prefetching, while still leaving the room for segregating 2396 // among the distinct pages. 2397 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2398 jio_fprintf(defaultStream::error_stream(), 2399 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2400 ContendedPaddingWidth, 0, 8192); 2401 status = false; 2402 } 2403 2404 // Need to enforce the padding not to break the existing field alignments. 2405 // It is sufficient to check against the largest type size. 2406 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2407 jio_fprintf(defaultStream::error_stream(), 2408 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2409 ContendedPaddingWidth, BytesPerLong); 2410 status = false; 2411 } 2412 2413 // Check lower bounds of the code cache 2414 // Template Interpreter code is approximately 3X larger in debug builds. 2415 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2416 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2417 jio_fprintf(defaultStream::error_stream(), 2418 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2419 os::vm_page_size()/K); 2420 status = false; 2421 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2422 jio_fprintf(defaultStream::error_stream(), 2423 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2424 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2425 status = false; 2426 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2427 jio_fprintf(defaultStream::error_stream(), 2428 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2429 min_code_cache_size/K); 2430 status = false; 2431 } else if (ReservedCodeCacheSize > 2*G) { 2432 // Code cache size larger than MAXINT is not supported. 2433 jio_fprintf(defaultStream::error_stream(), 2434 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2435 (2*G)/M); 2436 status = false; 2437 } 2438 2439 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2440 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2441 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2442 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2443 2444 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2445 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2446 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2447 // Check the minimum number of compiler threads 2448 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2449 2450 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2451 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2452 } 2453 2454 return status; 2455 } 2456 2457 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2458 const char* option_type) { 2459 if (ignore) return false; 2460 2461 const char* spacer = " "; 2462 if (option_type == NULL) { 2463 option_type = ++spacer; // Set both to the empty string. 2464 } 2465 2466 if (os::obsolete_option(option)) { 2467 jio_fprintf(defaultStream::error_stream(), 2468 "Obsolete %s%soption: %s\n", option_type, spacer, 2469 option->optionString); 2470 return false; 2471 } else { 2472 jio_fprintf(defaultStream::error_stream(), 2473 "Unrecognized %s%soption: %s\n", option_type, spacer, 2474 option->optionString); 2475 return true; 2476 } 2477 } 2478 2479 static const char* user_assertion_options[] = { 2480 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2481 }; 2482 2483 static const char* system_assertion_options[] = { 2484 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2485 }; 2486 2487 // Return true if any of the strings in null-terminated array 'names' matches. 2488 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2489 // the option must match exactly. 2490 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2491 bool tail_allowed) { 2492 for (/* empty */; *names != NULL; ++names) { 2493 if (match_option(option, *names, tail)) { 2494 if (**tail == '\0' || tail_allowed && **tail == ':') { 2495 return true; 2496 } 2497 } 2498 } 2499 return false; 2500 } 2501 2502 bool Arguments::parse_uintx(const char* value, 2503 uintx* uintx_arg, 2504 uintx min_size) { 2505 2506 // Check the sign first since atomull() parses only unsigned values. 2507 bool value_is_positive = !(*value == '-'); 2508 2509 if (value_is_positive) { 2510 julong n; 2511 bool good_return = atomull(value, &n); 2512 if (good_return) { 2513 bool above_minimum = n >= min_size; 2514 bool value_is_too_large = n > max_uintx; 2515 2516 if (above_minimum && !value_is_too_large) { 2517 *uintx_arg = n; 2518 return true; 2519 } 2520 } 2521 } 2522 return false; 2523 } 2524 2525 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2526 julong* long_arg, 2527 julong min_size) { 2528 if (!atomull(s, long_arg)) return arg_unreadable; 2529 return check_memory_size(*long_arg, min_size); 2530 } 2531 2532 // Parse JavaVMInitArgs structure 2533 2534 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2535 // For components of the system classpath. 2536 SysClassPath scp(Arguments::get_sysclasspath()); 2537 bool scp_assembly_required = false; 2538 2539 // Save default settings for some mode flags 2540 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2541 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2542 Arguments::_ClipInlining = ClipInlining; 2543 Arguments::_BackgroundCompilation = BackgroundCompilation; 2544 2545 // Setup flags for mixed which is the default 2546 set_mode_flags(_mixed); 2547 2548 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2549 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2550 if (result != JNI_OK) { 2551 return result; 2552 } 2553 2554 // Parse JavaVMInitArgs structure passed in 2555 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2556 if (result != JNI_OK) { 2557 return result; 2558 } 2559 2560 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2561 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2562 if (result != JNI_OK) { 2563 return result; 2564 } 2565 2566 // Do final processing now that all arguments have been parsed 2567 result = finalize_vm_init_args(&scp, scp_assembly_required); 2568 if (result != JNI_OK) { 2569 return result; 2570 } 2571 2572 return JNI_OK; 2573 } 2574 2575 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2576 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2577 // are dealing with -agentpath (case where name is a path), otherwise with 2578 // -agentlib 2579 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2580 char *_name; 2581 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2582 size_t _len_hprof, _len_jdwp, _len_prefix; 2583 2584 if (is_path) { 2585 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2586 return false; 2587 } 2588 2589 _name++; // skip past last path separator 2590 _len_prefix = strlen(JNI_LIB_PREFIX); 2591 2592 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2593 return false; 2594 } 2595 2596 _name += _len_prefix; 2597 _len_hprof = strlen(_hprof); 2598 _len_jdwp = strlen(_jdwp); 2599 2600 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2601 _name += _len_hprof; 2602 } 2603 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2604 _name += _len_jdwp; 2605 } 2606 else { 2607 return false; 2608 } 2609 2610 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2611 return false; 2612 } 2613 2614 return true; 2615 } 2616 2617 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2618 return true; 2619 } 2620 2621 return false; 2622 } 2623 2624 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2625 SysClassPath* scp_p, 2626 bool* scp_assembly_required_p, 2627 Flag::Flags origin) { 2628 // Remaining part of option string 2629 const char* tail; 2630 2631 // iterate over arguments 2632 for (int index = 0; index < args->nOptions; index++) { 2633 bool is_absolute_path = false; // for -agentpath vs -agentlib 2634 2635 const JavaVMOption* option = args->options + index; 2636 2637 if (!match_option(option, "-Djava.class.path", &tail) && 2638 !match_option(option, "-Dsun.java.command", &tail) && 2639 !match_option(option, "-Dsun.java.launcher", &tail)) { 2640 2641 // add all jvm options to the jvm_args string. This string 2642 // is used later to set the java.vm.args PerfData string constant. 2643 // the -Djava.class.path and the -Dsun.java.command options are 2644 // omitted from jvm_args string as each have their own PerfData 2645 // string constant object. 2646 build_jvm_args(option->optionString); 2647 } 2648 2649 // -verbose:[class/gc/jni] 2650 if (match_option(option, "-verbose", &tail)) { 2651 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2652 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2653 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2654 } else if (!strcmp(tail, ":gc")) { 2655 FLAG_SET_CMDLINE(bool, PrintGC, true); 2656 } else if (!strcmp(tail, ":jni")) { 2657 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2658 } 2659 // -da / -ea / -disableassertions / -enableassertions 2660 // These accept an optional class/package name separated by a colon, e.g., 2661 // -da:java.lang.Thread. 2662 } else if (match_option(option, user_assertion_options, &tail, true)) { 2663 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2664 if (*tail == '\0') { 2665 JavaAssertions::setUserClassDefault(enable); 2666 } else { 2667 assert(*tail == ':', "bogus match by match_option()"); 2668 JavaAssertions::addOption(tail + 1, enable); 2669 } 2670 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2671 } else if (match_option(option, system_assertion_options, &tail, false)) { 2672 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2673 JavaAssertions::setSystemClassDefault(enable); 2674 // -bootclasspath: 2675 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2676 scp_p->reset_path(tail); 2677 *scp_assembly_required_p = true; 2678 // -bootclasspath/a: 2679 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2680 scp_p->add_suffix(tail); 2681 *scp_assembly_required_p = true; 2682 // -bootclasspath/p: 2683 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2684 scp_p->add_prefix(tail); 2685 *scp_assembly_required_p = true; 2686 // -Xrun 2687 } else if (match_option(option, "-Xrun", &tail)) { 2688 if (tail != NULL) { 2689 const char* pos = strchr(tail, ':'); 2690 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2691 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2692 name[len] = '\0'; 2693 2694 char *options = NULL; 2695 if(pos != NULL) { 2696 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2697 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2698 } 2699 #if !INCLUDE_JVMTI 2700 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2701 jio_fprintf(defaultStream::error_stream(), 2702 "Profiling and debugging agents are not supported in this VM\n"); 2703 return JNI_ERR; 2704 } 2705 #endif // !INCLUDE_JVMTI 2706 add_init_library(name, options); 2707 } 2708 // -agentlib and -agentpath 2709 } else if (match_option(option, "-agentlib:", &tail) || 2710 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2711 if(tail != NULL) { 2712 const char* pos = strchr(tail, '='); 2713 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2714 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2715 name[len] = '\0'; 2716 2717 char *options = NULL; 2718 if(pos != NULL) { 2719 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2720 } 2721 #if !INCLUDE_JVMTI 2722 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2723 jio_fprintf(defaultStream::error_stream(), 2724 "Profiling and debugging agents are not supported in this VM\n"); 2725 return JNI_ERR; 2726 } 2727 #endif // !INCLUDE_JVMTI 2728 add_init_agent(name, options, is_absolute_path); 2729 } 2730 // -javaagent 2731 } else if (match_option(option, "-javaagent:", &tail)) { 2732 #if !INCLUDE_JVMTI 2733 jio_fprintf(defaultStream::error_stream(), 2734 "Instrumentation agents are not supported in this VM\n"); 2735 return JNI_ERR; 2736 #else 2737 if(tail != NULL) { 2738 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2739 add_init_agent("instrument", options, false); 2740 } 2741 #endif // !INCLUDE_JVMTI 2742 // -Xnoclassgc 2743 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2744 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2745 // -Xincgc: i-CMS 2746 } else if (match_option(option, "-Xincgc", &tail)) { 2747 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2748 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2749 // -Xnoincgc: no i-CMS 2750 } else if (match_option(option, "-Xnoincgc", &tail)) { 2751 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2752 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2753 // -Xconcgc 2754 } else if (match_option(option, "-Xconcgc", &tail)) { 2755 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2756 // -Xnoconcgc 2757 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2758 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2759 // -Xbatch 2760 } else if (match_option(option, "-Xbatch", &tail)) { 2761 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2762 // -Xmn for compatibility with other JVM vendors 2763 } else if (match_option(option, "-Xmn", &tail)) { 2764 julong long_initial_young_size = 0; 2765 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2766 if (errcode != arg_in_range) { 2767 jio_fprintf(defaultStream::error_stream(), 2768 "Invalid initial young generation size: %s\n", option->optionString); 2769 describe_range_error(errcode); 2770 return JNI_EINVAL; 2771 } 2772 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2773 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2774 // -Xms 2775 } else if (match_option(option, "-Xms", &tail)) { 2776 julong long_initial_heap_size = 0; 2777 // an initial heap size of 0 means automatically determine 2778 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2779 if (errcode != arg_in_range) { 2780 jio_fprintf(defaultStream::error_stream(), 2781 "Invalid initial heap size: %s\n", option->optionString); 2782 describe_range_error(errcode); 2783 return JNI_EINVAL; 2784 } 2785 set_min_heap_size((uintx)long_initial_heap_size); 2786 // Currently the minimum size and the initial heap sizes are the same. 2787 // Can be overridden with -XX:InitialHeapSize. 2788 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2789 // -Xmx 2790 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2791 julong long_max_heap_size = 0; 2792 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2793 if (errcode != arg_in_range) { 2794 jio_fprintf(defaultStream::error_stream(), 2795 "Invalid maximum heap size: %s\n", option->optionString); 2796 describe_range_error(errcode); 2797 return JNI_EINVAL; 2798 } 2799 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2800 // Xmaxf 2801 } else if (match_option(option, "-Xmaxf", &tail)) { 2802 char* err; 2803 int maxf = (int)(strtod(tail, &err) * 100); 2804 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2805 jio_fprintf(defaultStream::error_stream(), 2806 "Bad max heap free percentage size: %s\n", 2807 option->optionString); 2808 return JNI_EINVAL; 2809 } else { 2810 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2811 } 2812 // Xminf 2813 } else if (match_option(option, "-Xminf", &tail)) { 2814 char* err; 2815 int minf = (int)(strtod(tail, &err) * 100); 2816 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2817 jio_fprintf(defaultStream::error_stream(), 2818 "Bad min heap free percentage size: %s\n", 2819 option->optionString); 2820 return JNI_EINVAL; 2821 } else { 2822 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2823 } 2824 // -Xss 2825 } else if (match_option(option, "-Xss", &tail)) { 2826 julong long_ThreadStackSize = 0; 2827 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2828 if (errcode != arg_in_range) { 2829 jio_fprintf(defaultStream::error_stream(), 2830 "Invalid thread stack size: %s\n", option->optionString); 2831 describe_range_error(errcode); 2832 return JNI_EINVAL; 2833 } 2834 // Internally track ThreadStackSize in units of 1024 bytes. 2835 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2836 round_to((int)long_ThreadStackSize, K) / K); 2837 // -Xoss 2838 } else if (match_option(option, "-Xoss", &tail)) { 2839 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2840 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2841 julong long_CodeCacheExpansionSize = 0; 2842 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2843 if (errcode != arg_in_range) { 2844 jio_fprintf(defaultStream::error_stream(), 2845 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2846 os::vm_page_size()/K); 2847 return JNI_EINVAL; 2848 } 2849 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2850 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2851 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2852 julong long_ReservedCodeCacheSize = 0; 2853 2854 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2855 if (errcode != arg_in_range) { 2856 jio_fprintf(defaultStream::error_stream(), 2857 "Invalid maximum code cache size: %s.\n", option->optionString); 2858 return JNI_EINVAL; 2859 } 2860 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2861 //-XX:IncreaseFirstTierCompileThresholdAt= 2862 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2863 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2864 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2865 jio_fprintf(defaultStream::error_stream(), 2866 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2867 option->optionString); 2868 return JNI_EINVAL; 2869 } 2870 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2871 // -green 2872 } else if (match_option(option, "-green", &tail)) { 2873 jio_fprintf(defaultStream::error_stream(), 2874 "Green threads support not available\n"); 2875 return JNI_EINVAL; 2876 // -native 2877 } else if (match_option(option, "-native", &tail)) { 2878 // HotSpot always uses native threads, ignore silently for compatibility 2879 // -Xsqnopause 2880 } else if (match_option(option, "-Xsqnopause", &tail)) { 2881 // EVM option, ignore silently for compatibility 2882 // -Xrs 2883 } else if (match_option(option, "-Xrs", &tail)) { 2884 // Classic/EVM option, new functionality 2885 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2886 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2887 // change default internal VM signals used - lower case for back compat 2888 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2889 // -Xoptimize 2890 } else if (match_option(option, "-Xoptimize", &tail)) { 2891 // EVM option, ignore silently for compatibility 2892 // -Xprof 2893 } else if (match_option(option, "-Xprof", &tail)) { 2894 #if INCLUDE_FPROF 2895 _has_profile = true; 2896 #else // INCLUDE_FPROF 2897 jio_fprintf(defaultStream::error_stream(), 2898 "Flat profiling is not supported in this VM.\n"); 2899 return JNI_ERR; 2900 #endif // INCLUDE_FPROF 2901 // -Xconcurrentio 2902 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2903 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2904 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2905 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2906 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2907 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2908 2909 // -Xinternalversion 2910 } else if (match_option(option, "-Xinternalversion", &tail)) { 2911 jio_fprintf(defaultStream::output_stream(), "%s\n", 2912 VM_Version::internal_vm_info_string()); 2913 vm_exit(0); 2914 #ifndef PRODUCT 2915 // -Xprintflags 2916 } else if (match_option(option, "-Xprintflags", &tail)) { 2917 CommandLineFlags::printFlags(tty, false); 2918 vm_exit(0); 2919 #endif 2920 // -D 2921 } else if (match_option(option, "-D", &tail)) { 2922 if (!add_property(tail)) { 2923 return JNI_ENOMEM; 2924 } 2925 // Out of the box management support 2926 if (match_option(option, "-Dcom.sun.management", &tail)) { 2927 #if INCLUDE_MANAGEMENT 2928 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2929 #else 2930 jio_fprintf(defaultStream::output_stream(), 2931 "-Dcom.sun.management is not supported in this VM.\n"); 2932 return JNI_ERR; 2933 #endif 2934 } 2935 // -Xint 2936 } else if (match_option(option, "-Xint", &tail)) { 2937 set_mode_flags(_int); 2938 // -Xmixed 2939 } else if (match_option(option, "-Xmixed", &tail)) { 2940 set_mode_flags(_mixed); 2941 // -Xcomp 2942 } else if (match_option(option, "-Xcomp", &tail)) { 2943 // for testing the compiler; turn off all flags that inhibit compilation 2944 set_mode_flags(_comp); 2945 // -Xshare:dump 2946 } else if (match_option(option, "-Xshare:dump", &tail)) { 2947 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2948 set_mode_flags(_int); // Prevent compilation, which creates objects 2949 // -Xshare:on 2950 } else if (match_option(option, "-Xshare:on", &tail)) { 2951 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2952 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2953 // -Xshare:auto 2954 } else if (match_option(option, "-Xshare:auto", &tail)) { 2955 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2956 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2957 // -Xshare:off 2958 } else if (match_option(option, "-Xshare:off", &tail)) { 2959 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2960 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2961 // -Xverify 2962 } else if (match_option(option, "-Xverify", &tail)) { 2963 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2964 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2965 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2966 } else if (strcmp(tail, ":remote") == 0) { 2967 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2968 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2969 } else if (strcmp(tail, ":none") == 0) { 2970 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2971 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2972 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2973 return JNI_EINVAL; 2974 } 2975 // -Xdebug 2976 } else if (match_option(option, "-Xdebug", &tail)) { 2977 // note this flag has been used, then ignore 2978 set_xdebug_mode(true); 2979 // -Xnoagent 2980 } else if (match_option(option, "-Xnoagent", &tail)) { 2981 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2982 } else if (match_option(option, "-Xboundthreads", &tail)) { 2983 // Bind user level threads to kernel threads (Solaris only) 2984 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2985 } else if (match_option(option, "-Xloggc:", &tail)) { 2986 // Redirect GC output to the file. -Xloggc:<filename> 2987 // ostream_init_log(), when called will use this filename 2988 // to initialize a fileStream. 2989 _gc_log_filename = strdup(tail); 2990 if (!is_filename_valid(_gc_log_filename)) { 2991 jio_fprintf(defaultStream::output_stream(), 2992 "Invalid file name for use with -Xloggc: Filename can only contain the " 2993 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2994 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2995 return JNI_EINVAL; 2996 } 2997 FLAG_SET_CMDLINE(bool, PrintGC, true); 2998 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2999 3000 // JNI hooks 3001 } else if (match_option(option, "-Xcheck", &tail)) { 3002 if (!strcmp(tail, ":jni")) { 3003 #if !INCLUDE_JNI_CHECK 3004 warning("JNI CHECKING is not supported in this VM"); 3005 #else 3006 CheckJNICalls = true; 3007 #endif // INCLUDE_JNI_CHECK 3008 } else if (is_bad_option(option, args->ignoreUnrecognized, 3009 "check")) { 3010 return JNI_EINVAL; 3011 } 3012 } else if (match_option(option, "vfprintf", &tail)) { 3013 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3014 } else if (match_option(option, "exit", &tail)) { 3015 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3016 } else if (match_option(option, "abort", &tail)) { 3017 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3018 // -XX:+AggressiveHeap 3019 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 3020 3021 // This option inspects the machine and attempts to set various 3022 // parameters to be optimal for long-running, memory allocation 3023 // intensive jobs. It is intended for machines with large 3024 // amounts of cpu and memory. 3025 3026 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3027 // VM, but we may not be able to represent the total physical memory 3028 // available (like having 8gb of memory on a box but using a 32bit VM). 3029 // Thus, we need to make sure we're using a julong for intermediate 3030 // calculations. 3031 julong initHeapSize; 3032 julong total_memory = os::physical_memory(); 3033 3034 if (total_memory < (julong)256*M) { 3035 jio_fprintf(defaultStream::error_stream(), 3036 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3037 vm_exit(1); 3038 } 3039 3040 // The heap size is half of available memory, or (at most) 3041 // all of possible memory less 160mb (leaving room for the OS 3042 // when using ISM). This is the maximum; because adaptive sizing 3043 // is turned on below, the actual space used may be smaller. 3044 3045 initHeapSize = MIN2(total_memory / (julong)2, 3046 total_memory - (julong)160*M); 3047 3048 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3049 3050 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3051 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3052 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3053 // Currently the minimum size and the initial heap sizes are the same. 3054 set_min_heap_size(initHeapSize); 3055 } 3056 if (FLAG_IS_DEFAULT(NewSize)) { 3057 // Make the young generation 3/8ths of the total heap. 3058 FLAG_SET_CMDLINE(uintx, NewSize, 3059 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3060 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3061 } 3062 3063 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3064 FLAG_SET_DEFAULT(UseLargePages, true); 3065 #endif 3066 3067 // Increase some data structure sizes for efficiency 3068 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3069 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3070 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3071 3072 // See the OldPLABSize comment below, but replace 'after promotion' 3073 // with 'after copying'. YoungPLABSize is the size of the survivor 3074 // space per-gc-thread buffers. The default is 4kw. 3075 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3076 3077 // OldPLABSize is the size of the buffers in the old gen that 3078 // UseParallelGC uses to promote live data that doesn't fit in the 3079 // survivor spaces. At any given time, there's one for each gc thread. 3080 // The default size is 1kw. These buffers are rarely used, since the 3081 // survivor spaces are usually big enough. For specjbb, however, there 3082 // are occasions when there's lots of live data in the young gen 3083 // and we end up promoting some of it. We don't have a definite 3084 // explanation for why bumping OldPLABSize helps, but the theory 3085 // is that a bigger PLAB results in retaining something like the 3086 // original allocation order after promotion, which improves mutator 3087 // locality. A minor effect may be that larger PLABs reduce the 3088 // number of PLAB allocation events during gc. The value of 8kw 3089 // was arrived at by experimenting with specjbb. 3090 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3091 3092 // Enable parallel GC and adaptive generation sizing 3093 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3094 FLAG_SET_DEFAULT(ParallelGCThreads, 3095 Abstract_VM_Version::parallel_worker_threads()); 3096 3097 // Encourage steady state memory management 3098 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3099 3100 // This appears to improve mutator locality 3101 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3102 3103 // Get around early Solaris scheduling bug 3104 // (affinity vs other jobs on system) 3105 // but disallow DR and offlining (5008695). 3106 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3107 3108 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3109 // and the last option wins. 3110 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3111 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3112 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3113 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3114 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3115 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3116 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3117 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3118 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3119 uintx max_tenuring_thresh = 0; 3120 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3121 jio_fprintf(defaultStream::error_stream(), 3122 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3123 } 3124 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3125 3126 if (MaxTenuringThreshold == 0) { 3127 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3128 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3129 } else { 3130 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3131 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3132 } 3133 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3134 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3135 jio_fprintf(defaultStream::error_stream(), 3136 "Please use CMSClassUnloadingEnabled in place of " 3137 "CMSPermGenSweepingEnabled in the future\n"); 3138 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3139 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3140 jio_fprintf(defaultStream::error_stream(), 3141 "Please use -XX:+UseGCOverheadLimit in place of " 3142 "-XX:+UseGCTimeLimit in the future\n"); 3143 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3144 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3145 jio_fprintf(defaultStream::error_stream(), 3146 "Please use -XX:-UseGCOverheadLimit in place of " 3147 "-XX:-UseGCTimeLimit in the future\n"); 3148 // The TLE options are for compatibility with 1.3 and will be 3149 // removed without notice in a future release. These options 3150 // are not to be documented. 3151 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3152 // No longer used. 3153 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3154 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3155 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3156 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3157 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3158 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3159 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3160 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3161 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3162 // No longer used. 3163 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3164 julong long_tlab_size = 0; 3165 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3166 if (errcode != arg_in_range) { 3167 jio_fprintf(defaultStream::error_stream(), 3168 "Invalid TLAB size: %s\n", option->optionString); 3169 describe_range_error(errcode); 3170 return JNI_EINVAL; 3171 } 3172 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3173 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3174 // No longer used. 3175 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3176 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3177 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3178 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3179 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3180 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3181 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3182 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3183 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3184 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3185 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3186 #if defined(DTRACE_ENABLED) 3187 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3188 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3189 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3190 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3191 #else // defined(DTRACE_ENABLED) 3192 jio_fprintf(defaultStream::error_stream(), 3193 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3194 return JNI_EINVAL; 3195 #endif // defined(DTRACE_ENABLED) 3196 #ifdef ASSERT 3197 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3198 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3199 // disable scavenge before parallel mark-compact 3200 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3201 #endif 3202 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3203 julong cms_blocks_to_claim = (julong)atol(tail); 3204 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3205 jio_fprintf(defaultStream::error_stream(), 3206 "Please use -XX:OldPLABSize in place of " 3207 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3208 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3209 julong cms_blocks_to_claim = (julong)atol(tail); 3210 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3211 jio_fprintf(defaultStream::error_stream(), 3212 "Please use -XX:OldPLABSize in place of " 3213 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3214 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3215 julong old_plab_size = 0; 3216 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3217 if (errcode != arg_in_range) { 3218 jio_fprintf(defaultStream::error_stream(), 3219 "Invalid old PLAB size: %s\n", option->optionString); 3220 describe_range_error(errcode); 3221 return JNI_EINVAL; 3222 } 3223 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3224 jio_fprintf(defaultStream::error_stream(), 3225 "Please use -XX:OldPLABSize in place of " 3226 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3227 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3228 julong young_plab_size = 0; 3229 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3230 if (errcode != arg_in_range) { 3231 jio_fprintf(defaultStream::error_stream(), 3232 "Invalid young PLAB size: %s\n", option->optionString); 3233 describe_range_error(errcode); 3234 return JNI_EINVAL; 3235 } 3236 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3237 jio_fprintf(defaultStream::error_stream(), 3238 "Please use -XX:YoungPLABSize in place of " 3239 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3240 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3241 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3242 julong stack_size = 0; 3243 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3244 if (errcode != arg_in_range) { 3245 jio_fprintf(defaultStream::error_stream(), 3246 "Invalid mark stack size: %s\n", option->optionString); 3247 describe_range_error(errcode); 3248 return JNI_EINVAL; 3249 } 3250 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3251 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3252 julong max_stack_size = 0; 3253 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3254 if (errcode != arg_in_range) { 3255 jio_fprintf(defaultStream::error_stream(), 3256 "Invalid maximum mark stack size: %s\n", 3257 option->optionString); 3258 describe_range_error(errcode); 3259 return JNI_EINVAL; 3260 } 3261 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3262 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3263 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3264 uintx conc_threads = 0; 3265 if (!parse_uintx(tail, &conc_threads, 1)) { 3266 jio_fprintf(defaultStream::error_stream(), 3267 "Invalid concurrent threads: %s\n", option->optionString); 3268 return JNI_EINVAL; 3269 } 3270 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3271 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3272 julong max_direct_memory_size = 0; 3273 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3274 if (errcode != arg_in_range) { 3275 jio_fprintf(defaultStream::error_stream(), 3276 "Invalid maximum direct memory size: %s\n", 3277 option->optionString); 3278 describe_range_error(errcode); 3279 return JNI_EINVAL; 3280 } 3281 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3282 #if !INCLUDE_MANAGEMENT 3283 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3284 jio_fprintf(defaultStream::error_stream(), 3285 "ManagementServer is not supported in this VM.\n"); 3286 return JNI_ERR; 3287 #endif // INCLUDE_MANAGEMENT 3288 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3289 // Skip -XX:Flags= since that case has already been handled 3290 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3291 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3292 return JNI_EINVAL; 3293 } 3294 } 3295 // Unknown option 3296 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3297 return JNI_ERR; 3298 } 3299 } 3300 3301 // Change the default value for flags which have different default values 3302 // when working with older JDKs. 3303 #ifdef LINUX 3304 if (JDK_Version::current().compare_major(6) <= 0 && 3305 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3306 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3307 } 3308 #endif // LINUX 3309 return JNI_OK; 3310 } 3311 3312 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3313 // This must be done after all -D arguments have been processed. 3314 scp_p->expand_endorsed(); 3315 3316 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3317 // Assemble the bootclasspath elements into the final path. 3318 Arguments::set_sysclasspath(scp_p->combined_path()); 3319 } 3320 3321 // This must be done after all arguments have been processed. 3322 // java_compiler() true means set to "NONE" or empty. 3323 if (java_compiler() && !xdebug_mode()) { 3324 // For backwards compatibility, we switch to interpreted mode if 3325 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3326 // not specified. 3327 set_mode_flags(_int); 3328 } 3329 if (CompileThreshold == 0) { 3330 set_mode_flags(_int); 3331 } 3332 3333 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3334 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3335 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3336 } 3337 3338 #ifndef COMPILER2 3339 // Don't degrade server performance for footprint 3340 if (FLAG_IS_DEFAULT(UseLargePages) && 3341 MaxHeapSize < LargePageHeapSizeThreshold) { 3342 // No need for large granularity pages w/small heaps. 3343 // Note that large pages are enabled/disabled for both the 3344 // Java heap and the code cache. 3345 FLAG_SET_DEFAULT(UseLargePages, false); 3346 } 3347 3348 #else 3349 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3350 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3351 } 3352 #endif 3353 3354 #ifndef TIERED 3355 // Tiered compilation is undefined. 3356 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3357 #endif 3358 3359 // If we are running in a headless jre, force java.awt.headless property 3360 // to be true unless the property has already been set. 3361 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3362 if (os::is_headless_jre()) { 3363 const char* headless = Arguments::get_property("java.awt.headless"); 3364 if (headless == NULL) { 3365 char envbuffer[128]; 3366 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3367 if (!add_property("java.awt.headless=true")) { 3368 return JNI_ENOMEM; 3369 } 3370 } else { 3371 char buffer[256]; 3372 strcpy(buffer, "java.awt.headless="); 3373 strcat(buffer, envbuffer); 3374 if (!add_property(buffer)) { 3375 return JNI_ENOMEM; 3376 } 3377 } 3378 } 3379 } 3380 3381 if (!check_vm_args_consistency()) { 3382 return JNI_ERR; 3383 } 3384 3385 return JNI_OK; 3386 } 3387 3388 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3389 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3390 scp_assembly_required_p); 3391 } 3392 3393 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3394 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3395 scp_assembly_required_p); 3396 } 3397 3398 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3399 const int N_MAX_OPTIONS = 64; 3400 const int OPTION_BUFFER_SIZE = 1024; 3401 char buffer[OPTION_BUFFER_SIZE]; 3402 3403 // The variable will be ignored if it exceeds the length of the buffer. 3404 // Don't check this variable if user has special privileges 3405 // (e.g. unix su command). 3406 if (os::getenv(name, buffer, sizeof(buffer)) && 3407 !os::have_special_privileges()) { 3408 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3409 jio_fprintf(defaultStream::error_stream(), 3410 "Picked up %s: %s\n", name, buffer); 3411 char* rd = buffer; // pointer to the input string (rd) 3412 int i; 3413 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3414 while (isspace(*rd)) rd++; // skip whitespace 3415 if (*rd == 0) break; // we re done when the input string is read completely 3416 3417 // The output, option string, overwrites the input string. 3418 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3419 // input string (rd). 3420 char* wrt = rd; 3421 3422 options[i++].optionString = wrt; // Fill in option 3423 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3424 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3425 int quote = *rd; // matching quote to look for 3426 rd++; // don't copy open quote 3427 while (*rd != quote) { // include everything (even spaces) up until quote 3428 if (*rd == 0) { // string termination means unmatched string 3429 jio_fprintf(defaultStream::error_stream(), 3430 "Unmatched quote in %s\n", name); 3431 return JNI_ERR; 3432 } 3433 *wrt++ = *rd++; // copy to option string 3434 } 3435 rd++; // don't copy close quote 3436 } else { 3437 *wrt++ = *rd++; // copy to option string 3438 } 3439 } 3440 // Need to check if we're done before writing a NULL, 3441 // because the write could be to the byte that rd is pointing to. 3442 if (*rd++ == 0) { 3443 *wrt = 0; 3444 break; 3445 } 3446 *wrt = 0; // Zero terminate option 3447 } 3448 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3449 JavaVMInitArgs vm_args; 3450 vm_args.version = JNI_VERSION_1_2; 3451 vm_args.options = options; 3452 vm_args.nOptions = i; 3453 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3454 3455 if (PrintVMOptions) { 3456 const char* tail; 3457 for (int i = 0; i < vm_args.nOptions; i++) { 3458 const JavaVMOption *option = vm_args.options + i; 3459 if (match_option(option, "-XX:", &tail)) { 3460 logOption(tail); 3461 } 3462 } 3463 } 3464 3465 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3466 } 3467 return JNI_OK; 3468 } 3469 3470 void Arguments::set_shared_spaces_flags() { 3471 if (DumpSharedSpaces) { 3472 if (RequireSharedSpaces) { 3473 warning("cannot dump shared archive while using shared archive"); 3474 } 3475 UseSharedSpaces = false; 3476 #ifdef _LP64 3477 if (!UseCompressedOops || !UseCompressedClassPointers) { 3478 vm_exit_during_initialization( 3479 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3480 } 3481 } else { 3482 // UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces. 3483 if (!UseCompressedOops || !UseCompressedClassPointers) { 3484 no_shared_spaces(); 3485 } 3486 #endif 3487 } 3488 } 3489 3490 #if !INCLUDE_ALL_GCS 3491 static void force_serial_gc() { 3492 FLAG_SET_DEFAULT(UseSerialGC, true); 3493 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3494 UNSUPPORTED_GC_OPTION(UseG1GC); 3495 UNSUPPORTED_GC_OPTION(UseParallelGC); 3496 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3497 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3498 UNSUPPORTED_GC_OPTION(UseParNewGC); 3499 } 3500 #endif // INCLUDE_ALL_GCS 3501 3502 // Sharing support 3503 // Construct the path to the archive 3504 static char* get_shared_archive_path() { 3505 char *shared_archive_path; 3506 if (SharedArchiveFile == NULL) { 3507 char jvm_path[JVM_MAXPATHLEN]; 3508 os::jvm_path(jvm_path, sizeof(jvm_path)); 3509 char *end = strrchr(jvm_path, *os::file_separator()); 3510 if (end != NULL) *end = '\0'; 3511 size_t jvm_path_len = strlen(jvm_path); 3512 size_t file_sep_len = strlen(os::file_separator()); 3513 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3514 file_sep_len + 20, mtInternal); 3515 if (shared_archive_path != NULL) { 3516 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3517 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3518 strncat(shared_archive_path, "classes.jsa", 11); 3519 } 3520 } else { 3521 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3522 if (shared_archive_path != NULL) { 3523 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3524 } 3525 } 3526 return shared_archive_path; 3527 } 3528 3529 #ifndef PRODUCT 3530 // Determine whether LogVMOutput should be implicitly turned on. 3531 static bool use_vm_log() { 3532 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3533 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3534 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3535 PrintAssembly || TraceDeoptimization || TraceDependencies || 3536 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3537 return true; 3538 } 3539 3540 #ifdef COMPILER1 3541 if (PrintC1Statistics) { 3542 return true; 3543 } 3544 #endif // COMPILER1 3545 3546 #ifdef COMPILER2 3547 if (PrintOptoAssembly || PrintOptoStatistics) { 3548 return true; 3549 } 3550 #endif // COMPILER2 3551 3552 return false; 3553 } 3554 #endif // PRODUCT 3555 3556 // Parse entry point called from JNI_CreateJavaVM 3557 3558 jint Arguments::parse(const JavaVMInitArgs* args) { 3559 3560 // Remaining part of option string 3561 const char* tail; 3562 3563 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3564 const char* hotspotrc = ".hotspotrc"; 3565 bool settings_file_specified = false; 3566 bool needs_hotspotrc_warning = false; 3567 3568 const char* flags_file; 3569 int index; 3570 for (index = 0; index < args->nOptions; index++) { 3571 const JavaVMOption *option = args->options + index; 3572 if (match_option(option, "-XX:Flags=", &tail)) { 3573 flags_file = tail; 3574 settings_file_specified = true; 3575 } 3576 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3577 PrintVMOptions = true; 3578 } 3579 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3580 PrintVMOptions = false; 3581 } 3582 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3583 IgnoreUnrecognizedVMOptions = true; 3584 } 3585 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3586 IgnoreUnrecognizedVMOptions = false; 3587 } 3588 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3589 CommandLineFlags::printFlags(tty, false); 3590 vm_exit(0); 3591 } 3592 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3593 #if INCLUDE_NMT 3594 MemTracker::init_tracking_options(tail); 3595 #else 3596 jio_fprintf(defaultStream::error_stream(), 3597 "Native Memory Tracking is not supported in this VM\n"); 3598 return JNI_ERR; 3599 #endif 3600 } 3601 3602 3603 #ifndef PRODUCT 3604 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3605 CommandLineFlags::printFlags(tty, true); 3606 vm_exit(0); 3607 } 3608 #endif 3609 } 3610 3611 if (IgnoreUnrecognizedVMOptions) { 3612 // uncast const to modify the flag args->ignoreUnrecognized 3613 *(jboolean*)(&args->ignoreUnrecognized) = true; 3614 } 3615 3616 // Parse specified settings file 3617 if (settings_file_specified) { 3618 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3619 return JNI_EINVAL; 3620 } 3621 } else { 3622 #ifdef ASSERT 3623 // Parse default .hotspotrc settings file 3624 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3625 return JNI_EINVAL; 3626 } 3627 #else 3628 struct stat buf; 3629 if (os::stat(hotspotrc, &buf) == 0) { 3630 needs_hotspotrc_warning = true; 3631 } 3632 #endif 3633 } 3634 3635 if (PrintVMOptions) { 3636 for (index = 0; index < args->nOptions; index++) { 3637 const JavaVMOption *option = args->options + index; 3638 if (match_option(option, "-XX:", &tail)) { 3639 logOption(tail); 3640 } 3641 } 3642 } 3643 3644 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3645 jint result = parse_vm_init_args(args); 3646 if (result != JNI_OK) { 3647 return result; 3648 } 3649 3650 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3651 SharedArchivePath = get_shared_archive_path(); 3652 if (SharedArchivePath == NULL) { 3653 return JNI_ENOMEM; 3654 } 3655 3656 // Delay warning until here so that we've had a chance to process 3657 // the -XX:-PrintWarnings flag 3658 if (needs_hotspotrc_warning) { 3659 warning("%s file is present but has been ignored. " 3660 "Run with -XX:Flags=%s to load the file.", 3661 hotspotrc, hotspotrc); 3662 } 3663 3664 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3665 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3666 #endif 3667 3668 #if INCLUDE_ALL_GCS 3669 #if (defined JAVASE_EMBEDDED || defined ARM) 3670 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3671 #endif 3672 #endif 3673 3674 #ifndef PRODUCT 3675 if (TraceBytecodesAt != 0) { 3676 TraceBytecodes = true; 3677 } 3678 if (CountCompiledCalls) { 3679 if (UseCounterDecay) { 3680 warning("UseCounterDecay disabled because CountCalls is set"); 3681 UseCounterDecay = false; 3682 } 3683 } 3684 #endif // PRODUCT 3685 3686 if (ScavengeRootsInCode == 0) { 3687 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3688 warning("forcing ScavengeRootsInCode non-zero"); 3689 } 3690 ScavengeRootsInCode = 1; 3691 } 3692 3693 if (PrintGCDetails) { 3694 // Turn on -verbose:gc options as well 3695 PrintGC = true; 3696 } 3697 3698 if (!JDK_Version::is_gte_jdk18x_version()) { 3699 // To avoid changing the log format for 7 updates this flag is only 3700 // true by default in JDK8 and above. 3701 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3702 FLAG_SET_DEFAULT(PrintGCCause, false); 3703 } 3704 } 3705 3706 // Set object alignment values. 3707 set_object_alignment(); 3708 3709 #if !INCLUDE_ALL_GCS 3710 force_serial_gc(); 3711 #endif // INCLUDE_ALL_GCS 3712 #if !INCLUDE_CDS 3713 if (DumpSharedSpaces || RequireSharedSpaces) { 3714 jio_fprintf(defaultStream::error_stream(), 3715 "Shared spaces are not supported in this VM\n"); 3716 return JNI_ERR; 3717 } 3718 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3719 warning("Shared spaces are not supported in this VM"); 3720 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3721 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3722 } 3723 no_shared_spaces(); 3724 #endif // INCLUDE_CDS 3725 3726 return JNI_OK; 3727 } 3728 3729 jint Arguments::apply_ergo() { 3730 3731 // Set flags based on ergonomics. 3732 set_ergonomics_flags(); 3733 3734 set_shared_spaces_flags(); 3735 3736 // Check the GC selections again. 3737 if (!check_gc_consistency()) { 3738 return JNI_EINVAL; 3739 } 3740 3741 if (TieredCompilation) { 3742 set_tiered_flags(); 3743 } else { 3744 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3745 if (CompilationPolicyChoice >= 2) { 3746 vm_exit_during_initialization( 3747 "Incompatible compilation policy selected", NULL); 3748 } 3749 } 3750 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 3751 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3752 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 3753 } 3754 3755 3756 // Set heap size based on available physical memory 3757 set_heap_size(); 3758 3759 #if INCLUDE_ALL_GCS 3760 // Set per-collector flags 3761 if (UseParallelGC || UseParallelOldGC) { 3762 set_parallel_gc_flags(); 3763 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 3764 set_cms_and_parnew_gc_flags(); 3765 } else if (UseParNewGC) { // Skipped if CMS is set above 3766 set_parnew_gc_flags(); 3767 } else if (UseG1GC) { 3768 set_g1_gc_flags(); 3769 } 3770 check_deprecated_gcs(); 3771 check_deprecated_gc_flags(); 3772 if (AssumeMP && !UseSerialGC) { 3773 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3774 warning("If the number of processors is expected to increase from one, then" 3775 " you should configure the number of parallel GC threads appropriately" 3776 " using -XX:ParallelGCThreads=N"); 3777 } 3778 } 3779 if (MinHeapFreeRatio == 100) { 3780 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 3781 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 3782 } 3783 #else // INCLUDE_ALL_GCS 3784 assert(verify_serial_gc_flags(), "SerialGC unset"); 3785 #endif // INCLUDE_ALL_GCS 3786 3787 // Initialize Metaspace flags and alignments 3788 Metaspace::ergo_initialize(); 3789 3790 // Set bytecode rewriting flags 3791 set_bytecode_flags(); 3792 3793 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3794 set_aggressive_opts_flags(); 3795 3796 // Turn off biased locking for locking debug mode flags, 3797 // which are subtly different from each other but neither works with 3798 // biased locking 3799 if (UseHeavyMonitors 3800 #ifdef COMPILER1 3801 || !UseFastLocking 3802 #endif // COMPILER1 3803 ) { 3804 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3805 // flag set to true on command line; warn the user that they 3806 // can't enable biased locking here 3807 warning("Biased Locking is not supported with locking debug flags" 3808 "; ignoring UseBiasedLocking flag." ); 3809 } 3810 UseBiasedLocking = false; 3811 } 3812 3813 #ifdef ZERO 3814 // Clear flags not supported on zero. 3815 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3816 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3817 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3818 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3819 #endif // CC_INTERP 3820 3821 #ifdef COMPILER2 3822 if (!EliminateLocks) { 3823 EliminateNestedLocks = false; 3824 } 3825 if (!Inline) { 3826 IncrementalInline = false; 3827 } 3828 #ifndef PRODUCT 3829 if (!IncrementalInline) { 3830 AlwaysIncrementalInline = false; 3831 } 3832 #endif 3833 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3834 // nothing to use the profiling, turn if off 3835 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3836 } 3837 if (UseTypeSpeculation && FLAG_IS_DEFAULT(ReplaceInParentMaps)) { 3838 // Doing the replace in parent maps helps speculation 3839 FLAG_SET_DEFAULT(ReplaceInParentMaps, true); 3840 } 3841 #endif 3842 3843 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3844 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3845 DebugNonSafepoints = true; 3846 } 3847 3848 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3849 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3850 } 3851 3852 #ifndef PRODUCT 3853 if (CompileTheWorld) { 3854 // Force NmethodSweeper to sweep whole CodeCache each time. 3855 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3856 NmethodSweepFraction = 1; 3857 } 3858 } 3859 3860 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3861 if (use_vm_log()) { 3862 LogVMOutput = true; 3863 } 3864 } 3865 #endif // PRODUCT 3866 3867 if (PrintCommandLineFlags) { 3868 CommandLineFlags::printSetFlags(tty); 3869 } 3870 3871 // Apply CPU specific policy for the BiasedLocking 3872 if (UseBiasedLocking) { 3873 if (!VM_Version::use_biased_locking() && 3874 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3875 UseBiasedLocking = false; 3876 } 3877 } 3878 #ifdef COMPILER2 3879 if (!UseBiasedLocking || EmitSync != 0) { 3880 UseOptoBiasInlining = false; 3881 } 3882 #endif 3883 3884 return JNI_OK; 3885 } 3886 3887 jint Arguments::adjust_after_os() { 3888 if (UseNUMA) { 3889 if (UseParallelGC || UseParallelOldGC) { 3890 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3891 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3892 } 3893 } 3894 // UseNUMAInterleaving is set to ON for all collectors and 3895 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3896 // such as the parallel collector for Linux and Solaris will 3897 // interleave old gen and survivor spaces on top of NUMA 3898 // allocation policy for the eden space. 3899 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3900 // all platforms and ParallelGC on Windows will interleave all 3901 // of the heap spaces across NUMA nodes. 3902 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3903 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3904 } 3905 } 3906 return JNI_OK; 3907 } 3908 3909 int Arguments::PropertyList_count(SystemProperty* pl) { 3910 int count = 0; 3911 while(pl != NULL) { 3912 count++; 3913 pl = pl->next(); 3914 } 3915 return count; 3916 } 3917 3918 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3919 assert(key != NULL, "just checking"); 3920 SystemProperty* prop; 3921 for (prop = pl; prop != NULL; prop = prop->next()) { 3922 if (strcmp(key, prop->key()) == 0) return prop->value(); 3923 } 3924 return NULL; 3925 } 3926 3927 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3928 int count = 0; 3929 const char* ret_val = NULL; 3930 3931 while(pl != NULL) { 3932 if(count >= index) { 3933 ret_val = pl->key(); 3934 break; 3935 } 3936 count++; 3937 pl = pl->next(); 3938 } 3939 3940 return ret_val; 3941 } 3942 3943 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3944 int count = 0; 3945 char* ret_val = NULL; 3946 3947 while(pl != NULL) { 3948 if(count >= index) { 3949 ret_val = pl->value(); 3950 break; 3951 } 3952 count++; 3953 pl = pl->next(); 3954 } 3955 3956 return ret_val; 3957 } 3958 3959 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3960 SystemProperty* p = *plist; 3961 if (p == NULL) { 3962 *plist = new_p; 3963 } else { 3964 while (p->next() != NULL) { 3965 p = p->next(); 3966 } 3967 p->set_next(new_p); 3968 } 3969 } 3970 3971 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3972 if (plist == NULL) 3973 return; 3974 3975 SystemProperty* new_p = new SystemProperty(k, v, true); 3976 PropertyList_add(plist, new_p); 3977 } 3978 3979 // This add maintains unique property key in the list. 3980 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3981 if (plist == NULL) 3982 return; 3983 3984 // If property key exist then update with new value. 3985 SystemProperty* prop; 3986 for (prop = *plist; prop != NULL; prop = prop->next()) { 3987 if (strcmp(k, prop->key()) == 0) { 3988 if (append) { 3989 prop->append_value(v); 3990 } else { 3991 prop->set_value(v); 3992 } 3993 return; 3994 } 3995 } 3996 3997 PropertyList_add(plist, k, v); 3998 } 3999 4000 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4001 // Returns true if all of the source pointed by src has been copied over to 4002 // the destination buffer pointed by buf. Otherwise, returns false. 4003 // Notes: 4004 // 1. If the length (buflen) of the destination buffer excluding the 4005 // NULL terminator character is not long enough for holding the expanded 4006 // pid characters, it also returns false instead of returning the partially 4007 // expanded one. 4008 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4009 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4010 char* buf, size_t buflen) { 4011 const char* p = src; 4012 char* b = buf; 4013 const char* src_end = &src[srclen]; 4014 char* buf_end = &buf[buflen - 1]; 4015 4016 while (p < src_end && b < buf_end) { 4017 if (*p == '%') { 4018 switch (*(++p)) { 4019 case '%': // "%%" ==> "%" 4020 *b++ = *p++; 4021 break; 4022 case 'p': { // "%p" ==> current process id 4023 // buf_end points to the character before the last character so 4024 // that we could write '\0' to the end of the buffer. 4025 size_t buf_sz = buf_end - b + 1; 4026 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4027 4028 // if jio_snprintf fails or the buffer is not long enough to hold 4029 // the expanded pid, returns false. 4030 if (ret < 0 || ret >= (int)buf_sz) { 4031 return false; 4032 } else { 4033 b += ret; 4034 assert(*b == '\0', "fail in copy_expand_pid"); 4035 if (p == src_end && b == buf_end + 1) { 4036 // reach the end of the buffer. 4037 return true; 4038 } 4039 } 4040 p++; 4041 break; 4042 } 4043 default : 4044 *b++ = '%'; 4045 } 4046 } else { 4047 *b++ = *p++; 4048 } 4049 } 4050 *b = '\0'; 4051 return (p == src_end); // return false if not all of the source was copied 4052 }