1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/symbolTable.hpp" 29 #include "compiler/compilerOracle.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/cardTableRS.hpp" 32 #include "memory/genCollectedHeap.hpp" 33 #include "memory/referenceProcessor.hpp" 34 #include "memory/universe.inline.hpp" 35 #include "oops/oop.inline.hpp" 36 #include "prims/jvmtiExport.hpp" 37 #include "runtime/arguments.hpp" 38 #include "runtime/arguments_ext.hpp" 39 #include "runtime/globals_extension.hpp" 40 #include "runtime/java.hpp" 41 #include "services/management.hpp" 42 #include "services/memTracker.hpp" 43 #include "utilities/defaultStream.hpp" 44 #include "utilities/macros.hpp" 45 #include "utilities/stringUtils.hpp" 46 #include "utilities/taskqueue.hpp" 47 #ifdef TARGET_OS_FAMILY_linux 48 # include "os_linux.inline.hpp" 49 #endif 50 #ifdef TARGET_OS_FAMILY_solaris 51 # include "os_solaris.inline.hpp" 52 #endif 53 #ifdef TARGET_OS_FAMILY_windows 54 # include "os_windows.inline.hpp" 55 #endif 56 #ifdef TARGET_OS_FAMILY_aix 57 # include "os_aix.inline.hpp" 58 #endif 59 #ifdef TARGET_OS_FAMILY_bsd 60 # include "os_bsd.inline.hpp" 61 #endif 62 #if INCLUDE_ALL_GCS 63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 66 #endif // INCLUDE_ALL_GCS 67 68 // Note: This is a special bug reporting site for the JVM 69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 70 #define DEFAULT_JAVA_LAUNCHER "generic" 71 72 // Disable options not supported in this release, with a warning if they 73 // were explicitly requested on the command-line 74 #define UNSUPPORTED_OPTION(opt, description) \ 75 do { \ 76 if (opt) { \ 77 if (FLAG_IS_CMDLINE(opt)) { \ 78 warning(description " is disabled in this release."); \ 79 } \ 80 FLAG_SET_DEFAULT(opt, false); \ 81 } \ 82 } while(0) 83 84 #define UNSUPPORTED_GC_OPTION(gc) \ 85 do { \ 86 if (gc) { \ 87 if (FLAG_IS_CMDLINE(gc)) { \ 88 warning(#gc " is not supported in this VM. Using Serial GC."); \ 89 } \ 90 FLAG_SET_DEFAULT(gc, false); \ 91 } \ 92 } while(0) 93 94 char** Arguments::_jvm_flags_array = NULL; 95 int Arguments::_num_jvm_flags = 0; 96 char** Arguments::_jvm_args_array = NULL; 97 int Arguments::_num_jvm_args = 0; 98 char* Arguments::_java_command = NULL; 99 SystemProperty* Arguments::_system_properties = NULL; 100 const char* Arguments::_gc_log_filename = NULL; 101 bool Arguments::_has_profile = false; 102 size_t Arguments::_conservative_max_heap_alignment = 0; 103 uintx Arguments::_min_heap_size = 0; 104 uintx Arguments::_min_heap_free_ratio = 0; 105 uintx Arguments::_max_heap_free_ratio = 0; 106 Arguments::Mode Arguments::_mode = _mixed; 107 bool Arguments::_java_compiler = false; 108 bool Arguments::_xdebug_mode = false; 109 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 110 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 111 int Arguments::_sun_java_launcher_pid = -1; 112 bool Arguments::_created_by_gamma_launcher = false; 113 114 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 115 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 116 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 117 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 118 bool Arguments::_ClipInlining = ClipInlining; 119 120 char* Arguments::SharedArchivePath = NULL; 121 122 AgentLibraryList Arguments::_libraryList; 123 AgentLibraryList Arguments::_agentList; 124 125 abort_hook_t Arguments::_abort_hook = NULL; 126 exit_hook_t Arguments::_exit_hook = NULL; 127 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 128 129 130 SystemProperty *Arguments::_java_ext_dirs = NULL; 131 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 132 SystemProperty *Arguments::_sun_boot_library_path = NULL; 133 SystemProperty *Arguments::_java_library_path = NULL; 134 SystemProperty *Arguments::_java_home = NULL; 135 SystemProperty *Arguments::_java_class_path = NULL; 136 SystemProperty *Arguments::_sun_boot_class_path = NULL; 137 138 char* Arguments::_meta_index_path = NULL; 139 char* Arguments::_meta_index_dir = NULL; 140 141 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 142 143 static bool match_option(const JavaVMOption *option, const char* name, 144 const char** tail) { 145 int len = (int)strlen(name); 146 if (strncmp(option->optionString, name, len) == 0) { 147 *tail = option->optionString + len; 148 return true; 149 } else { 150 return false; 151 } 152 } 153 154 static void logOption(const char* opt) { 155 if (PrintVMOptions) { 156 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 157 } 158 } 159 160 // Process java launcher properties. 161 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 162 // See if sun.java.launcher or sun.java.launcher.pid is defined. 163 // Must do this before setting up other system properties, 164 // as some of them may depend on launcher type. 165 for (int index = 0; index < args->nOptions; index++) { 166 const JavaVMOption* option = args->options + index; 167 const char* tail; 168 169 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 170 process_java_launcher_argument(tail, option->extraInfo); 171 continue; 172 } 173 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 174 _sun_java_launcher_pid = atoi(tail); 175 continue; 176 } 177 } 178 } 179 180 // Initialize system properties key and value. 181 void Arguments::init_system_properties() { 182 183 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 184 "Java Virtual Machine Specification", false)); 185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 188 189 // following are JVMTI agent writeable properties. 190 // Properties values are set to NULL and they are 191 // os specific they are initialized in os::init_system_properties_values(). 192 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 193 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 194 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 195 _java_library_path = new SystemProperty("java.library.path", NULL, true); 196 _java_home = new SystemProperty("java.home", NULL, true); 197 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 198 199 _java_class_path = new SystemProperty("java.class.path", "", true); 200 201 // Add to System Property list. 202 PropertyList_add(&_system_properties, _java_ext_dirs); 203 PropertyList_add(&_system_properties, _java_endorsed_dirs); 204 PropertyList_add(&_system_properties, _sun_boot_library_path); 205 PropertyList_add(&_system_properties, _java_library_path); 206 PropertyList_add(&_system_properties, _java_home); 207 PropertyList_add(&_system_properties, _java_class_path); 208 PropertyList_add(&_system_properties, _sun_boot_class_path); 209 210 // Set OS specific system properties values 211 os::init_system_properties_values(); 212 } 213 214 215 // Update/Initialize System properties after JDK version number is known 216 void Arguments::init_version_specific_system_properties() { 217 enum { bufsz = 16 }; 218 char buffer[bufsz]; 219 const char* spec_vendor = "Sun Microsystems Inc."; 220 uint32_t spec_version = 0; 221 222 if (JDK_Version::is_gte_jdk17x_version()) { 223 spec_vendor = "Oracle Corporation"; 224 spec_version = JDK_Version::current().major_version(); 225 } 226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 227 228 PropertyList_add(&_system_properties, 229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.version", buffer, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 234 } 235 236 /** 237 * Provide a slightly more user-friendly way of eliminating -XX flags. 238 * When a flag is eliminated, it can be added to this list in order to 239 * continue accepting this flag on the command-line, while issuing a warning 240 * and ignoring the value. Once the JDK version reaches the 'accept_until' 241 * limit, we flatly refuse to admit the existence of the flag. This allows 242 * a flag to die correctly over JDK releases using HSX. 243 */ 244 typedef struct { 245 const char* name; 246 JDK_Version obsoleted_in; // when the flag went away 247 JDK_Version accept_until; // which version to start denying the existence 248 } ObsoleteFlag; 249 250 static ObsoleteFlag obsolete_jvm_flags[] = { 251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 266 { "DefaultInitialRAMFraction", 267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 268 { "UseDepthFirstScavengeOrder", 269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 270 { "HandlePromotionFailure", 271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 272 { "MaxLiveObjectEvacuationRatio", 273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 275 { "UseParallelOldGCCompacting", 276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 277 { "UseParallelDensePrefixUpdate", 278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 279 { "UseParallelOldGCDensePrefix", 280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 302 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 303 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 304 #ifdef PRODUCT 305 { "DesiredMethodLimit", 306 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 307 #endif // PRODUCT 308 { NULL, JDK_Version(0), JDK_Version(0) } 309 }; 310 311 // Returns true if the flag is obsolete and fits into the range specified 312 // for being ignored. In the case that the flag is ignored, the 'version' 313 // value is filled in with the version number when the flag became 314 // obsolete so that that value can be displayed to the user. 315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 316 int i = 0; 317 assert(version != NULL, "Must provide a version buffer"); 318 while (obsolete_jvm_flags[i].name != NULL) { 319 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 320 // <flag>=xxx form 321 // [-|+]<flag> form 322 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 323 ((s[0] == '+' || s[0] == '-') && 324 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 325 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 326 *version = flag_status.obsoleted_in; 327 return true; 328 } 329 } 330 i++; 331 } 332 return false; 333 } 334 335 // Constructs the system class path (aka boot class path) from the following 336 // components, in order: 337 // 338 // prefix // from -Xbootclasspath/p:... 339 // endorsed // the expansion of -Djava.endorsed.dirs=... 340 // base // from os::get_system_properties() or -Xbootclasspath= 341 // suffix // from -Xbootclasspath/a:... 342 // 343 // java.endorsed.dirs is a list of directories; any jar or zip files in the 344 // directories are added to the sysclasspath just before the base. 345 // 346 // This could be AllStatic, but it isn't needed after argument processing is 347 // complete. 348 class SysClassPath: public StackObj { 349 public: 350 SysClassPath(const char* base); 351 ~SysClassPath(); 352 353 inline void set_base(const char* base); 354 inline void add_prefix(const char* prefix); 355 inline void add_suffix_to_prefix(const char* suffix); 356 inline void add_suffix(const char* suffix); 357 inline void reset_path(const char* base); 358 359 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 360 // property. Must be called after all command-line arguments have been 361 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 362 // combined_path(). 363 void expand_endorsed(); 364 365 inline const char* get_base() const { return _items[_scp_base]; } 366 inline const char* get_prefix() const { return _items[_scp_prefix]; } 367 inline const char* get_suffix() const { return _items[_scp_suffix]; } 368 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 369 370 // Combine all the components into a single c-heap-allocated string; caller 371 // must free the string if/when no longer needed. 372 char* combined_path(); 373 374 private: 375 // Utility routines. 376 static char* add_to_path(const char* path, const char* str, bool prepend); 377 static char* add_jars_to_path(char* path, const char* directory); 378 379 inline void reset_item_at(int index); 380 381 // Array indices for the items that make up the sysclasspath. All except the 382 // base are allocated in the C heap and freed by this class. 383 enum { 384 _scp_prefix, // from -Xbootclasspath/p:... 385 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 386 _scp_base, // the default sysclasspath 387 _scp_suffix, // from -Xbootclasspath/a:... 388 _scp_nitems // the number of items, must be last. 389 }; 390 391 const char* _items[_scp_nitems]; 392 DEBUG_ONLY(bool _expansion_done;) 393 }; 394 395 SysClassPath::SysClassPath(const char* base) { 396 memset(_items, 0, sizeof(_items)); 397 _items[_scp_base] = base; 398 DEBUG_ONLY(_expansion_done = false;) 399 } 400 401 SysClassPath::~SysClassPath() { 402 // Free everything except the base. 403 for (int i = 0; i < _scp_nitems; ++i) { 404 if (i != _scp_base) reset_item_at(i); 405 } 406 DEBUG_ONLY(_expansion_done = false;) 407 } 408 409 inline void SysClassPath::set_base(const char* base) { 410 _items[_scp_base] = base; 411 } 412 413 inline void SysClassPath::add_prefix(const char* prefix) { 414 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 415 } 416 417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 419 } 420 421 inline void SysClassPath::add_suffix(const char* suffix) { 422 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 423 } 424 425 inline void SysClassPath::reset_item_at(int index) { 426 assert(index < _scp_nitems && index != _scp_base, "just checking"); 427 if (_items[index] != NULL) { 428 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 429 _items[index] = NULL; 430 } 431 } 432 433 inline void SysClassPath::reset_path(const char* base) { 434 // Clear the prefix and suffix. 435 reset_item_at(_scp_prefix); 436 reset_item_at(_scp_suffix); 437 set_base(base); 438 } 439 440 //------------------------------------------------------------------------------ 441 442 void SysClassPath::expand_endorsed() { 443 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 444 445 const char* path = Arguments::get_property("java.endorsed.dirs"); 446 if (path == NULL) { 447 path = Arguments::get_endorsed_dir(); 448 assert(path != NULL, "no default for java.endorsed.dirs"); 449 } 450 451 char* expanded_path = NULL; 452 const char separator = *os::path_separator(); 453 const char* const end = path + strlen(path); 454 while (path < end) { 455 const char* tmp_end = strchr(path, separator); 456 if (tmp_end == NULL) { 457 expanded_path = add_jars_to_path(expanded_path, path); 458 path = end; 459 } else { 460 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 461 memcpy(dirpath, path, tmp_end - path); 462 dirpath[tmp_end - path] = '\0'; 463 expanded_path = add_jars_to_path(expanded_path, dirpath); 464 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 465 path = tmp_end + 1; 466 } 467 } 468 _items[_scp_endorsed] = expanded_path; 469 DEBUG_ONLY(_expansion_done = true;) 470 } 471 472 // Combine the bootclasspath elements, some of which may be null, into a single 473 // c-heap-allocated string. 474 char* SysClassPath::combined_path() { 475 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 476 assert(_expansion_done, "must call expand_endorsed() first."); 477 478 size_t lengths[_scp_nitems]; 479 size_t total_len = 0; 480 481 const char separator = *os::path_separator(); 482 483 // Get the lengths. 484 int i; 485 for (i = 0; i < _scp_nitems; ++i) { 486 if (_items[i] != NULL) { 487 lengths[i] = strlen(_items[i]); 488 // Include space for the separator char (or a NULL for the last item). 489 total_len += lengths[i] + 1; 490 } 491 } 492 assert(total_len > 0, "empty sysclasspath not allowed"); 493 494 // Copy the _items to a single string. 495 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 496 char* cp_tmp = cp; 497 for (i = 0; i < _scp_nitems; ++i) { 498 if (_items[i] != NULL) { 499 memcpy(cp_tmp, _items[i], lengths[i]); 500 cp_tmp += lengths[i]; 501 *cp_tmp++ = separator; 502 } 503 } 504 *--cp_tmp = '\0'; // Replace the extra separator. 505 return cp; 506 } 507 508 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 509 char* 510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 511 char *cp; 512 513 assert(str != NULL, "just checking"); 514 if (path == NULL) { 515 size_t len = strlen(str) + 1; 516 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 517 memcpy(cp, str, len); // copy the trailing null 518 } else { 519 const char separator = *os::path_separator(); 520 size_t old_len = strlen(path); 521 size_t str_len = strlen(str); 522 size_t len = old_len + str_len + 2; 523 524 if (prepend) { 525 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 526 char* cp_tmp = cp; 527 memcpy(cp_tmp, str, str_len); 528 cp_tmp += str_len; 529 *cp_tmp = separator; 530 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 531 FREE_C_HEAP_ARRAY(char, path, mtInternal); 532 } else { 533 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 534 char* cp_tmp = cp + old_len; 535 *cp_tmp = separator; 536 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 537 } 538 } 539 return cp; 540 } 541 542 // Scan the directory and append any jar or zip files found to path. 543 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 545 DIR* dir = os::opendir(directory); 546 if (dir == NULL) return path; 547 548 char dir_sep[2] = { '\0', '\0' }; 549 size_t directory_len = strlen(directory); 550 const char fileSep = *os::file_separator(); 551 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 552 553 /* Scan the directory for jars/zips, appending them to path. */ 554 struct dirent *entry; 555 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 556 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 557 const char* name = entry->d_name; 558 const char* ext = name + strlen(name) - 4; 559 bool isJarOrZip = ext > name && 560 (os::file_name_strcmp(ext, ".jar") == 0 || 561 os::file_name_strcmp(ext, ".zip") == 0); 562 if (isJarOrZip) { 563 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 564 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 565 path = add_to_path(path, jarpath, false); 566 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 567 } 568 } 569 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 570 os::closedir(dir); 571 return path; 572 } 573 574 // Parses a memory size specification string. 575 static bool atomull(const char *s, julong* result) { 576 julong n = 0; 577 int args_read = sscanf(s, JULONG_FORMAT, &n); 578 if (args_read != 1) { 579 return false; 580 } 581 while (*s != '\0' && isdigit(*s)) { 582 s++; 583 } 584 // 4705540: illegal if more characters are found after the first non-digit 585 if (strlen(s) > 1) { 586 return false; 587 } 588 switch (*s) { 589 case 'T': case 't': 590 *result = n * G * K; 591 // Check for overflow. 592 if (*result/((julong)G * K) != n) return false; 593 return true; 594 case 'G': case 'g': 595 *result = n * G; 596 if (*result/G != n) return false; 597 return true; 598 case 'M': case 'm': 599 *result = n * M; 600 if (*result/M != n) return false; 601 return true; 602 case 'K': case 'k': 603 *result = n * K; 604 if (*result/K != n) return false; 605 return true; 606 case '\0': 607 *result = n; 608 return true; 609 default: 610 return false; 611 } 612 } 613 614 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 615 if (size < min_size) return arg_too_small; 616 // Check that size will fit in a size_t (only relevant on 32-bit) 617 if (size > max_uintx) return arg_too_big; 618 return arg_in_range; 619 } 620 621 // Describe an argument out of range error 622 void Arguments::describe_range_error(ArgsRange errcode) { 623 switch(errcode) { 624 case arg_too_big: 625 jio_fprintf(defaultStream::error_stream(), 626 "The specified size exceeds the maximum " 627 "representable size.\n"); 628 break; 629 case arg_too_small: 630 case arg_unreadable: 631 case arg_in_range: 632 // do nothing for now 633 break; 634 default: 635 ShouldNotReachHere(); 636 } 637 } 638 639 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 640 return CommandLineFlags::boolAtPut(name, &value, origin); 641 } 642 643 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 644 double v; 645 if (sscanf(value, "%lf", &v) != 1) { 646 return false; 647 } 648 649 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 650 return true; 651 } 652 return false; 653 } 654 655 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 656 julong v; 657 intx intx_v; 658 bool is_neg = false; 659 // Check the sign first since atomull() parses only unsigned values. 660 if (*value == '-') { 661 if (!CommandLineFlags::intxAt(name, &intx_v)) { 662 return false; 663 } 664 value++; 665 is_neg = true; 666 } 667 if (!atomull(value, &v)) { 668 return false; 669 } 670 intx_v = (intx) v; 671 if (is_neg) { 672 intx_v = -intx_v; 673 } 674 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 675 return true; 676 } 677 uintx uintx_v = (uintx) v; 678 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 679 return true; 680 } 681 uint64_t uint64_t_v = (uint64_t) v; 682 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 683 return true; 684 } 685 return false; 686 } 687 688 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 689 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 690 // Contract: CommandLineFlags always returns a pointer that needs freeing. 691 FREE_C_HEAP_ARRAY(char, value, mtInternal); 692 return true; 693 } 694 695 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 696 const char* old_value = ""; 697 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 698 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 699 size_t new_len = strlen(new_value); 700 const char* value; 701 char* free_this_too = NULL; 702 if (old_len == 0) { 703 value = new_value; 704 } else if (new_len == 0) { 705 value = old_value; 706 } else { 707 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 708 // each new setting adds another LINE to the switch: 709 sprintf(buf, "%s\n%s", old_value, new_value); 710 value = buf; 711 free_this_too = buf; 712 } 713 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 714 // CommandLineFlags always returns a pointer that needs freeing. 715 FREE_C_HEAP_ARRAY(char, value, mtInternal); 716 if (free_this_too != NULL) { 717 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 718 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 719 } 720 return true; 721 } 722 723 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 724 725 // range of acceptable characters spelled out for portability reasons 726 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 727 #define BUFLEN 255 728 char name[BUFLEN+1]; 729 char dummy; 730 731 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 732 return set_bool_flag(name, false, origin); 733 } 734 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 735 return set_bool_flag(name, true, origin); 736 } 737 738 char punct; 739 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 740 const char* value = strchr(arg, '=') + 1; 741 Flag* flag = Flag::find_flag(name, strlen(name)); 742 if (flag != NULL && flag->is_ccstr()) { 743 if (flag->ccstr_accumulates()) { 744 return append_to_string_flag(name, value, origin); 745 } else { 746 if (value[0] == '\0') { 747 value = NULL; 748 } 749 return set_string_flag(name, value, origin); 750 } 751 } 752 } 753 754 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 755 const char* value = strchr(arg, '=') + 1; 756 // -XX:Foo:=xxx will reset the string flag to the given value. 757 if (value[0] == '\0') { 758 value = NULL; 759 } 760 return set_string_flag(name, value, origin); 761 } 762 763 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 764 #define SIGNED_NUMBER_RANGE "[-0123456789]" 765 #define NUMBER_RANGE "[0123456789]" 766 char value[BUFLEN + 1]; 767 char value2[BUFLEN + 1]; 768 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 769 // Looks like a floating-point number -- try again with more lenient format string 770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 771 return set_fp_numeric_flag(name, value, origin); 772 } 773 } 774 775 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 776 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 777 return set_numeric_flag(name, value, origin); 778 } 779 780 return false; 781 } 782 783 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 784 assert(bldarray != NULL, "illegal argument"); 785 786 if (arg == NULL) { 787 return; 788 } 789 790 int new_count = *count + 1; 791 792 // expand the array and add arg to the last element 793 if (*bldarray == NULL) { 794 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 795 } else { 796 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 797 } 798 (*bldarray)[*count] = strdup(arg); 799 *count = new_count; 800 } 801 802 void Arguments::build_jvm_args(const char* arg) { 803 add_string(&_jvm_args_array, &_num_jvm_args, arg); 804 } 805 806 void Arguments::build_jvm_flags(const char* arg) { 807 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 808 } 809 810 // utility function to return a string that concatenates all 811 // strings in a given char** array 812 const char* Arguments::build_resource_string(char** args, int count) { 813 if (args == NULL || count == 0) { 814 return NULL; 815 } 816 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 817 for (int i = 1; i < count; i++) { 818 length += strlen(args[i]) + 1; // add 1 for a space 819 } 820 char* s = NEW_RESOURCE_ARRAY(char, length); 821 strcpy(s, args[0]); 822 for (int j = 1; j < count; j++) { 823 strcat(s, " "); 824 strcat(s, args[j]); 825 } 826 return (const char*) s; 827 } 828 829 void Arguments::print_on(outputStream* st) { 830 st->print_cr("VM Arguments:"); 831 if (num_jvm_flags() > 0) { 832 st->print("jvm_flags: "); print_jvm_flags_on(st); 833 } 834 if (num_jvm_args() > 0) { 835 st->print("jvm_args: "); print_jvm_args_on(st); 836 } 837 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 838 if (_java_class_path != NULL) { 839 char* path = _java_class_path->value(); 840 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 841 } 842 st->print_cr("Launcher Type: %s", _sun_java_launcher); 843 } 844 845 void Arguments::print_jvm_flags_on(outputStream* st) { 846 if (_num_jvm_flags > 0) { 847 for (int i=0; i < _num_jvm_flags; i++) { 848 st->print("%s ", _jvm_flags_array[i]); 849 } 850 st->cr(); 851 } 852 } 853 854 void Arguments::print_jvm_args_on(outputStream* st) { 855 if (_num_jvm_args > 0) { 856 for (int i=0; i < _num_jvm_args; i++) { 857 st->print("%s ", _jvm_args_array[i]); 858 } 859 st->cr(); 860 } 861 } 862 863 bool Arguments::process_argument(const char* arg, 864 jboolean ignore_unrecognized, Flag::Flags origin) { 865 866 JDK_Version since = JDK_Version(); 867 868 if (parse_argument(arg, origin) || ignore_unrecognized) { 869 return true; 870 } 871 872 bool has_plus_minus = (*arg == '+' || *arg == '-'); 873 const char* const argname = has_plus_minus ? arg + 1 : arg; 874 if (is_newly_obsolete(arg, &since)) { 875 char version[256]; 876 since.to_string(version, sizeof(version)); 877 warning("ignoring option %s; support was removed in %s", argname, version); 878 return true; 879 } 880 881 // For locked flags, report a custom error message if available. 882 // Otherwise, report the standard unrecognized VM option. 883 884 size_t arg_len; 885 const char* equal_sign = strchr(argname, '='); 886 if (equal_sign == NULL) { 887 arg_len = strlen(argname); 888 } else { 889 arg_len = equal_sign - argname; 890 } 891 892 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 893 if (found_flag != NULL) { 894 char locked_message_buf[BUFLEN]; 895 found_flag->get_locked_message(locked_message_buf, BUFLEN); 896 if (strlen(locked_message_buf) == 0) { 897 if (found_flag->is_bool() && !has_plus_minus) { 898 jio_fprintf(defaultStream::error_stream(), 899 "Missing +/- setting for VM option '%s'\n", argname); 900 } else if (!found_flag->is_bool() && has_plus_minus) { 901 jio_fprintf(defaultStream::error_stream(), 902 "Unexpected +/- setting in VM option '%s'\n", argname); 903 } else { 904 jio_fprintf(defaultStream::error_stream(), 905 "Improperly specified VM option '%s'\n", argname); 906 } 907 } else { 908 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 909 } 910 } else { 911 jio_fprintf(defaultStream::error_stream(), 912 "Unrecognized VM option '%s'\n", argname); 913 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 914 if (fuzzy_matched != NULL) { 915 jio_fprintf(defaultStream::error_stream(), 916 "Did you mean '%s%s%s'?\n", 917 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 918 fuzzy_matched->_name, 919 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 920 } 921 } 922 923 // allow for commandline "commenting out" options like -XX:#+Verbose 924 return arg[0] == '#'; 925 } 926 927 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 928 FILE* stream = fopen(file_name, "rb"); 929 if (stream == NULL) { 930 if (should_exist) { 931 jio_fprintf(defaultStream::error_stream(), 932 "Could not open settings file %s\n", file_name); 933 return false; 934 } else { 935 return true; 936 } 937 } 938 939 char token[1024]; 940 int pos = 0; 941 942 bool in_white_space = true; 943 bool in_comment = false; 944 bool in_quote = false; 945 char quote_c = 0; 946 bool result = true; 947 948 int c = getc(stream); 949 while(c != EOF && pos < (int)(sizeof(token)-1)) { 950 if (in_white_space) { 951 if (in_comment) { 952 if (c == '\n') in_comment = false; 953 } else { 954 if (c == '#') in_comment = true; 955 else if (!isspace(c)) { 956 in_white_space = false; 957 token[pos++] = c; 958 } 959 } 960 } else { 961 if (c == '\n' || (!in_quote && isspace(c))) { 962 // token ends at newline, or at unquoted whitespace 963 // this allows a way to include spaces in string-valued options 964 token[pos] = '\0'; 965 logOption(token); 966 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 967 build_jvm_flags(token); 968 pos = 0; 969 in_white_space = true; 970 in_quote = false; 971 } else if (!in_quote && (c == '\'' || c == '"')) { 972 in_quote = true; 973 quote_c = c; 974 } else if (in_quote && (c == quote_c)) { 975 in_quote = false; 976 } else { 977 token[pos++] = c; 978 } 979 } 980 c = getc(stream); 981 } 982 if (pos > 0) { 983 token[pos] = '\0'; 984 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 985 build_jvm_flags(token); 986 } 987 fclose(stream); 988 return result; 989 } 990 991 //============================================================================================================= 992 // Parsing of properties (-D) 993 994 const char* Arguments::get_property(const char* key) { 995 return PropertyList_get_value(system_properties(), key); 996 } 997 998 bool Arguments::add_property(const char* prop) { 999 const char* eq = strchr(prop, '='); 1000 char* key; 1001 // ns must be static--its address may be stored in a SystemProperty object. 1002 const static char ns[1] = {0}; 1003 char* value = (char *)ns; 1004 1005 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1006 key = AllocateHeap(key_len + 1, mtInternal); 1007 strncpy(key, prop, key_len); 1008 key[key_len] = '\0'; 1009 1010 if (eq != NULL) { 1011 size_t value_len = strlen(prop) - key_len - 1; 1012 value = AllocateHeap(value_len + 1, mtInternal); 1013 strncpy(value, &prop[key_len + 1], value_len + 1); 1014 } 1015 1016 if (strcmp(key, "java.compiler") == 0) { 1017 process_java_compiler_argument(value); 1018 FreeHeap(key); 1019 if (eq != NULL) { 1020 FreeHeap(value); 1021 } 1022 return true; 1023 } else if (strcmp(key, "sun.java.command") == 0) { 1024 _java_command = value; 1025 1026 // Record value in Arguments, but let it get passed to Java. 1027 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 1028 // launcher.pid property is private and is processed 1029 // in process_sun_java_launcher_properties(); 1030 // the sun.java.launcher property is passed on to the java application 1031 FreeHeap(key); 1032 if (eq != NULL) { 1033 FreeHeap(value); 1034 } 1035 return true; 1036 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1037 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1038 // its value without going through the property list or making a Java call. 1039 _java_vendor_url_bug = value; 1040 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1041 PropertyList_unique_add(&_system_properties, key, value, true); 1042 return true; 1043 } 1044 // Create new property and add at the end of the list 1045 PropertyList_unique_add(&_system_properties, key, value); 1046 return true; 1047 } 1048 1049 //=========================================================================================================== 1050 // Setting int/mixed/comp mode flags 1051 1052 void Arguments::set_mode_flags(Mode mode) { 1053 // Set up default values for all flags. 1054 // If you add a flag to any of the branches below, 1055 // add a default value for it here. 1056 set_java_compiler(false); 1057 _mode = mode; 1058 1059 // Ensure Agent_OnLoad has the correct initial values. 1060 // This may not be the final mode; mode may change later in onload phase. 1061 PropertyList_unique_add(&_system_properties, "java.vm.info", 1062 (char*)VM_Version::vm_info_string(), false); 1063 1064 UseInterpreter = true; 1065 UseCompiler = true; 1066 UseLoopCounter = true; 1067 1068 #ifndef ZERO 1069 // Turn these off for mixed and comp. Leave them on for Zero. 1070 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1071 UseFastAccessorMethods = (mode == _int); 1072 } 1073 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1074 UseFastEmptyMethods = (mode == _int); 1075 } 1076 #endif 1077 1078 // Default values may be platform/compiler dependent - 1079 // use the saved values 1080 ClipInlining = Arguments::_ClipInlining; 1081 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1082 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1083 BackgroundCompilation = Arguments::_BackgroundCompilation; 1084 1085 // Change from defaults based on mode 1086 switch (mode) { 1087 default: 1088 ShouldNotReachHere(); 1089 break; 1090 case _int: 1091 UseCompiler = false; 1092 UseLoopCounter = false; 1093 AlwaysCompileLoopMethods = false; 1094 UseOnStackReplacement = false; 1095 break; 1096 case _mixed: 1097 // same as default 1098 break; 1099 case _comp: 1100 UseInterpreter = false; 1101 BackgroundCompilation = false; 1102 ClipInlining = false; 1103 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1104 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1105 // compile a level 4 (C2) and then continue executing it. 1106 if (TieredCompilation) { 1107 Tier3InvokeNotifyFreqLog = 0; 1108 Tier4InvocationThreshold = 0; 1109 } 1110 break; 1111 } 1112 } 1113 1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1115 // Conflict: required to use shared spaces (-Xshare:on), but 1116 // incompatible command line options were chosen. 1117 1118 static void no_shared_spaces(const char* message) { 1119 if (RequireSharedSpaces) { 1120 jio_fprintf(defaultStream::error_stream(), 1121 "Class data sharing is inconsistent with other specified options.\n"); 1122 vm_exit_during_initialization("Unable to use shared archive.", message); 1123 } else { 1124 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1125 } 1126 } 1127 #endif 1128 1129 void Arguments::set_tiered_flags() { 1130 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1131 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1132 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1133 } 1134 if (CompilationPolicyChoice < 2) { 1135 vm_exit_during_initialization( 1136 "Incompatible compilation policy selected", NULL); 1137 } 1138 // Increase the code cache size - tiered compiles a lot more. 1139 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1140 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1141 } 1142 if (!UseInterpreter) { // -Xcomp 1143 Tier3InvokeNotifyFreqLog = 0; 1144 Tier4InvocationThreshold = 0; 1145 } 1146 } 1147 1148 /** 1149 * Returns the minimum number of compiler threads needed to run the JVM. The following 1150 * configurations are possible. 1151 * 1152 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1153 * compiler threads is 0. 1154 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1155 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1156 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1157 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1158 * C1 can be used, so the minimum number of compiler threads is 1. 1159 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1160 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1161 * the minimum number of compiler threads is 2. 1162 */ 1163 int Arguments::get_min_number_of_compiler_threads() { 1164 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1165 return 0; // case 1 1166 #else 1167 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1168 return 1; // case 2 or case 3 1169 } 1170 return 2; // case 4 (tiered) 1171 #endif 1172 } 1173 1174 #if INCLUDE_ALL_GCS 1175 static void disable_adaptive_size_policy(const char* collector_name) { 1176 if (UseAdaptiveSizePolicy) { 1177 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1178 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1179 collector_name); 1180 } 1181 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1182 } 1183 } 1184 1185 void Arguments::set_parnew_gc_flags() { 1186 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1187 "control point invariant"); 1188 assert(UseParNewGC, "Error"); 1189 1190 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1191 disable_adaptive_size_policy("UseParNewGC"); 1192 1193 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1194 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1195 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1196 } else if (ParallelGCThreads == 0) { 1197 jio_fprintf(defaultStream::error_stream(), 1198 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1199 vm_exit(1); 1200 } 1201 1202 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1203 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1204 // we set them to 1024 and 1024. 1205 // See CR 6362902. 1206 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1207 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1208 } 1209 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1210 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1211 } 1212 1213 // AlwaysTenure flag should make ParNew promote all at first collection. 1214 // See CR 6362902. 1215 if (AlwaysTenure) { 1216 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1217 } 1218 // When using compressed oops, we use local overflow stacks, 1219 // rather than using a global overflow list chained through 1220 // the klass word of the object's pre-image. 1221 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1222 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1223 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1224 } 1225 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1226 } 1227 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1228 } 1229 1230 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1231 // sparc/solaris for certain applications, but would gain from 1232 // further optimization and tuning efforts, and would almost 1233 // certainly gain from analysis of platform and environment. 1234 void Arguments::set_cms_and_parnew_gc_flags() { 1235 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1236 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1237 1238 // If we are using CMS, we prefer to UseParNewGC, 1239 // unless explicitly forbidden. 1240 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1241 FLAG_SET_ERGO(bool, UseParNewGC, true); 1242 } 1243 1244 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1245 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1246 1247 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1248 // as needed. 1249 if (UseParNewGC) { 1250 set_parnew_gc_flags(); 1251 } 1252 1253 size_t max_heap = align_size_down(MaxHeapSize, 1254 CardTableRS::ct_max_alignment_constraint()); 1255 1256 // Now make adjustments for CMS 1257 intx tenuring_default = (intx)6; 1258 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1259 1260 // Preferred young gen size for "short" pauses: 1261 // upper bound depends on # of threads and NewRatio. 1262 const uintx parallel_gc_threads = 1263 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1264 const size_t preferred_max_new_size_unaligned = 1265 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1266 size_t preferred_max_new_size = 1267 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1268 1269 // Unless explicitly requested otherwise, size young gen 1270 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1271 1272 // If either MaxNewSize or NewRatio is set on the command line, 1273 // assume the user is trying to set the size of the young gen. 1274 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1275 1276 // Set MaxNewSize to our calculated preferred_max_new_size unless 1277 // NewSize was set on the command line and it is larger than 1278 // preferred_max_new_size. 1279 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1280 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1281 } else { 1282 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1283 } 1284 if (PrintGCDetails && Verbose) { 1285 // Too early to use gclog_or_tty 1286 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1287 } 1288 1289 // Code along this path potentially sets NewSize and OldSize 1290 if (PrintGCDetails && Verbose) { 1291 // Too early to use gclog_or_tty 1292 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1293 " initial_heap_size: " SIZE_FORMAT 1294 " max_heap: " SIZE_FORMAT, 1295 min_heap_size(), InitialHeapSize, max_heap); 1296 } 1297 size_t min_new = preferred_max_new_size; 1298 if (FLAG_IS_CMDLINE(NewSize)) { 1299 min_new = NewSize; 1300 } 1301 if (max_heap > min_new && min_heap_size() > min_new) { 1302 // Unless explicitly requested otherwise, make young gen 1303 // at least min_new, and at most preferred_max_new_size. 1304 if (FLAG_IS_DEFAULT(NewSize)) { 1305 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1306 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1307 if (PrintGCDetails && Verbose) { 1308 // Too early to use gclog_or_tty 1309 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1310 } 1311 } 1312 // Unless explicitly requested otherwise, size old gen 1313 // so it's NewRatio x of NewSize. 1314 if (FLAG_IS_DEFAULT(OldSize)) { 1315 if (max_heap > NewSize) { 1316 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1317 if (PrintGCDetails && Verbose) { 1318 // Too early to use gclog_or_tty 1319 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1320 } 1321 } 1322 } 1323 } 1324 } 1325 // Unless explicitly requested otherwise, definitely 1326 // promote all objects surviving "tenuring_default" scavenges. 1327 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1328 FLAG_IS_DEFAULT(SurvivorRatio)) { 1329 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1330 } 1331 // If we decided above (or user explicitly requested) 1332 // `promote all' (via MaxTenuringThreshold := 0), 1333 // prefer minuscule survivor spaces so as not to waste 1334 // space for (non-existent) survivors 1335 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1336 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1337 } 1338 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1339 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1340 // This is done in order to make ParNew+CMS configuration to work 1341 // with YoungPLABSize and OldPLABSize options. 1342 // See CR 6362902. 1343 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1344 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1345 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1346 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1347 // the value (either from the command line or ergonomics) of 1348 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1349 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1350 } else { 1351 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1352 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1353 // we'll let it to take precedence. 1354 jio_fprintf(defaultStream::error_stream(), 1355 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1356 " options are specified for the CMS collector." 1357 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1358 } 1359 } 1360 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1361 // OldPLAB sizing manually turned off: Use a larger default setting, 1362 // unless it was manually specified. This is because a too-low value 1363 // will slow down scavenges. 1364 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1365 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1366 } 1367 } 1368 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1369 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1370 // If either of the static initialization defaults have changed, note this 1371 // modification. 1372 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1373 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1374 } 1375 if (PrintGCDetails && Verbose) { 1376 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1377 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1378 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1379 } 1380 } 1381 #endif // INCLUDE_ALL_GCS 1382 1383 void set_object_alignment() { 1384 // Object alignment. 1385 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1386 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1387 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1388 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1389 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1390 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1391 1392 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1393 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1394 1395 // Oop encoding heap max 1396 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1397 1398 #if INCLUDE_ALL_GCS 1399 // Set CMS global values 1400 CompactibleFreeListSpace::set_cms_values(); 1401 #endif // INCLUDE_ALL_GCS 1402 } 1403 1404 bool verify_object_alignment() { 1405 // Object alignment. 1406 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1407 jio_fprintf(defaultStream::error_stream(), 1408 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1409 (int)ObjectAlignmentInBytes); 1410 return false; 1411 } 1412 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1413 jio_fprintf(defaultStream::error_stream(), 1414 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1415 (int)ObjectAlignmentInBytes, BytesPerLong); 1416 return false; 1417 } 1418 // It does not make sense to have big object alignment 1419 // since a space lost due to alignment will be greater 1420 // then a saved space from compressed oops. 1421 if ((int)ObjectAlignmentInBytes > 256) { 1422 jio_fprintf(defaultStream::error_stream(), 1423 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1424 (int)ObjectAlignmentInBytes); 1425 return false; 1426 } 1427 // In case page size is very small. 1428 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1429 jio_fprintf(defaultStream::error_stream(), 1430 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1431 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1432 return false; 1433 } 1434 if(SurvivorAlignmentInBytes == 0) { 1435 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1436 } else { 1437 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1438 jio_fprintf(defaultStream::error_stream(), 1439 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1440 (int)SurvivorAlignmentInBytes); 1441 return false; 1442 } 1443 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1444 jio_fprintf(defaultStream::error_stream(), 1445 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1446 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1447 return false; 1448 } 1449 } 1450 return true; 1451 } 1452 1453 size_t Arguments::max_heap_for_compressed_oops() { 1454 // Avoid sign flip. 1455 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1456 // We need to fit both the NULL page and the heap into the memory budget, while 1457 // keeping alignment constraints of the heap. To guarantee the latter, as the 1458 // NULL page is located before the heap, we pad the NULL page to the conservative 1459 // maximum alignment that the GC may ever impose upon the heap. 1460 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1461 _conservative_max_heap_alignment); 1462 1463 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1464 NOT_LP64(ShouldNotReachHere(); return 0); 1465 } 1466 1467 bool Arguments::should_auto_select_low_pause_collector() { 1468 if (UseAutoGCSelectPolicy && 1469 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1470 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1471 if (PrintGCDetails) { 1472 // Cannot use gclog_or_tty yet. 1473 tty->print_cr("Automatic selection of the low pause collector" 1474 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1475 } 1476 return true; 1477 } 1478 return false; 1479 } 1480 1481 void Arguments::set_use_compressed_oops() { 1482 #ifndef ZERO 1483 #ifdef _LP64 1484 // MaxHeapSize is not set up properly at this point, but 1485 // the only value that can override MaxHeapSize if we are 1486 // to use UseCompressedOops is InitialHeapSize. 1487 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1488 1489 if (max_heap_size <= max_heap_for_compressed_oops()) { 1490 #if !defined(COMPILER1) || defined(TIERED) 1491 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1492 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1493 } 1494 #endif 1495 #ifdef _WIN64 1496 if (UseLargePages && UseCompressedOops) { 1497 // Cannot allocate guard pages for implicit checks in indexed addressing 1498 // mode, when large pages are specified on windows. 1499 // This flag could be switched ON if narrow oop base address is set to 0, 1500 // see code in Universe::initialize_heap(). 1501 Universe::set_narrow_oop_use_implicit_null_checks(false); 1502 } 1503 #endif // _WIN64 1504 } else { 1505 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1506 warning("Max heap size too large for Compressed Oops"); 1507 FLAG_SET_DEFAULT(UseCompressedOops, false); 1508 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1509 } 1510 } 1511 #endif // _LP64 1512 #endif // ZERO 1513 } 1514 1515 1516 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1517 // set_use_compressed_oops(). 1518 void Arguments::set_use_compressed_klass_ptrs() { 1519 #ifndef ZERO 1520 #ifdef _LP64 1521 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1522 if (!UseCompressedOops) { 1523 if (UseCompressedClassPointers) { 1524 warning("UseCompressedClassPointers requires UseCompressedOops"); 1525 } 1526 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1527 } else { 1528 // Turn on UseCompressedClassPointers too 1529 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1530 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1531 } 1532 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1533 if (UseCompressedClassPointers) { 1534 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1535 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1536 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1537 } 1538 } 1539 } 1540 #endif // _LP64 1541 #endif // !ZERO 1542 } 1543 1544 void Arguments::set_conservative_max_heap_alignment() { 1545 // The conservative maximum required alignment for the heap is the maximum of 1546 // the alignments imposed by several sources: any requirements from the heap 1547 // itself, the collector policy and the maximum page size we may run the VM 1548 // with. 1549 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1550 #if INCLUDE_ALL_GCS 1551 if (UseParallelGC) { 1552 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1553 } else if (UseG1GC) { 1554 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1555 } 1556 #endif // INCLUDE_ALL_GCS 1557 _conservative_max_heap_alignment = MAX4(heap_alignment, 1558 (size_t)os::vm_allocation_granularity(), 1559 os::max_page_size(), 1560 CollectorPolicy::compute_heap_alignment()); 1561 } 1562 1563 void Arguments::select_gc_ergonomically() { 1564 if (os::is_server_class_machine()) { 1565 if (should_auto_select_low_pause_collector()) { 1566 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1567 } else { 1568 FLAG_SET_ERGO(bool, UseParallelGC, true); 1569 } 1570 } 1571 } 1572 1573 void Arguments::select_gc() { 1574 if (!gc_selected()) { 1575 ArgumentsExt::select_gc_ergonomically(); 1576 } 1577 } 1578 1579 void Arguments::set_ergonomics_flags() { 1580 select_gc(); 1581 1582 #ifdef COMPILER2 1583 // Shared spaces work fine with other GCs but causes bytecode rewriting 1584 // to be disabled, which hurts interpreter performance and decreases 1585 // server performance. When -server is specified, keep the default off 1586 // unless it is asked for. Future work: either add bytecode rewriting 1587 // at link time, or rewrite bytecodes in non-shared methods. 1588 if (!DumpSharedSpaces && !RequireSharedSpaces && 1589 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1590 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1591 } 1592 #endif 1593 1594 set_conservative_max_heap_alignment(); 1595 1596 #ifndef ZERO 1597 #ifdef _LP64 1598 set_use_compressed_oops(); 1599 1600 // set_use_compressed_klass_ptrs() must be called after calling 1601 // set_use_compressed_oops(). 1602 set_use_compressed_klass_ptrs(); 1603 1604 // Also checks that certain machines are slower with compressed oops 1605 // in vm_version initialization code. 1606 #endif // _LP64 1607 #endif // !ZERO 1608 } 1609 1610 void Arguments::set_parallel_gc_flags() { 1611 assert(UseParallelGC || UseParallelOldGC, "Error"); 1612 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1613 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1614 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1615 } 1616 FLAG_SET_DEFAULT(UseParallelGC, true); 1617 1618 // If no heap maximum was requested explicitly, use some reasonable fraction 1619 // of the physical memory, up to a maximum of 1GB. 1620 FLAG_SET_DEFAULT(ParallelGCThreads, 1621 Abstract_VM_Version::parallel_worker_threads()); 1622 if (ParallelGCThreads == 0) { 1623 jio_fprintf(defaultStream::error_stream(), 1624 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1625 vm_exit(1); 1626 } 1627 1628 if (UseAdaptiveSizePolicy) { 1629 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1630 // unless the user actually sets these flags. 1631 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1632 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1633 _min_heap_free_ratio = MinHeapFreeRatio; 1634 } 1635 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1636 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1637 _max_heap_free_ratio = MaxHeapFreeRatio; 1638 } 1639 } 1640 1641 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1642 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1643 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1644 // See CR 6362902 for details. 1645 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1646 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1647 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1648 } 1649 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1650 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1651 } 1652 } 1653 1654 if (UseParallelOldGC) { 1655 // Par compact uses lower default values since they are treated as 1656 // minimums. These are different defaults because of the different 1657 // interpretation and are not ergonomically set. 1658 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1659 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1660 } 1661 } 1662 } 1663 1664 void Arguments::set_g1_gc_flags() { 1665 assert(UseG1GC, "Error"); 1666 #ifdef COMPILER1 1667 FastTLABRefill = false; 1668 #endif 1669 FLAG_SET_DEFAULT(ParallelGCThreads, 1670 Abstract_VM_Version::parallel_worker_threads()); 1671 if (ParallelGCThreads == 0) { 1672 FLAG_SET_DEFAULT(ParallelGCThreads, 1673 Abstract_VM_Version::parallel_worker_threads()); 1674 } 1675 1676 #if INCLUDE_ALL_GCS 1677 if (G1ConcRefinementThreads == 0) { 1678 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1679 } 1680 #endif 1681 1682 // MarkStackSize will be set (if it hasn't been set by the user) 1683 // when concurrent marking is initialized. 1684 // Its value will be based upon the number of parallel marking threads. 1685 // But we do set the maximum mark stack size here. 1686 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1687 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1688 } 1689 1690 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1691 // In G1, we want the default GC overhead goal to be higher than 1692 // say in PS. So we set it here to 10%. Otherwise the heap might 1693 // be expanded more aggressively than we would like it to. In 1694 // fact, even 10% seems to not be high enough in some cases 1695 // (especially small GC stress tests that the main thing they do 1696 // is allocation). We might consider increase it further. 1697 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1698 } 1699 1700 if (PrintGCDetails && Verbose) { 1701 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1702 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1703 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1704 } 1705 } 1706 1707 #if !INCLUDE_ALL_GCS 1708 #ifdef ASSERT 1709 static bool verify_serial_gc_flags() { 1710 return (UseSerialGC && 1711 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1712 UseParallelGC || UseParallelOldGC)); 1713 } 1714 #endif // ASSERT 1715 #endif // INCLUDE_ALL_GCS 1716 1717 void Arguments::set_gc_specific_flags() { 1718 #if INCLUDE_ALL_GCS 1719 // Set per-collector flags 1720 if (UseParallelGC || UseParallelOldGC) { 1721 set_parallel_gc_flags(); 1722 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 1723 set_cms_and_parnew_gc_flags(); 1724 } else if (UseParNewGC) { // Skipped if CMS is set above 1725 set_parnew_gc_flags(); 1726 } else if (UseG1GC) { 1727 set_g1_gc_flags(); 1728 } 1729 check_deprecated_gcs(); 1730 check_deprecated_gc_flags(); 1731 if (AssumeMP && !UseSerialGC) { 1732 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1733 warning("If the number of processors is expected to increase from one, then" 1734 " you should configure the number of parallel GC threads appropriately" 1735 " using -XX:ParallelGCThreads=N"); 1736 } 1737 } 1738 if (MinHeapFreeRatio == 100) { 1739 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1740 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1741 } 1742 #else // INCLUDE_ALL_GCS 1743 assert(verify_serial_gc_flags(), "SerialGC unset"); 1744 #endif // INCLUDE_ALL_GCS 1745 } 1746 1747 julong Arguments::limit_by_allocatable_memory(julong limit) { 1748 julong max_allocatable; 1749 julong result = limit; 1750 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1751 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1752 } 1753 return result; 1754 } 1755 1756 void Arguments::set_heap_size() { 1757 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1758 // Deprecated flag 1759 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1760 } 1761 1762 const julong phys_mem = 1763 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1764 : (julong)MaxRAM; 1765 1766 // If the maximum heap size has not been set with -Xmx, 1767 // then set it as fraction of the size of physical memory, 1768 // respecting the maximum and minimum sizes of the heap. 1769 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1770 julong reasonable_max = phys_mem / MaxRAMFraction; 1771 1772 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1773 // Small physical memory, so use a minimum fraction of it for the heap 1774 reasonable_max = phys_mem / MinRAMFraction; 1775 } else { 1776 // Not-small physical memory, so require a heap at least 1777 // as large as MaxHeapSize 1778 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1779 } 1780 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1781 // Limit the heap size to ErgoHeapSizeLimit 1782 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1783 } 1784 if (UseCompressedOops) { 1785 // Limit the heap size to the maximum possible when using compressed oops 1786 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1787 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1788 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1789 // but it should be not less than default MaxHeapSize. 1790 max_coop_heap -= HeapBaseMinAddress; 1791 } 1792 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1793 } 1794 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1795 1796 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1797 // An initial heap size was specified on the command line, 1798 // so be sure that the maximum size is consistent. Done 1799 // after call to limit_by_allocatable_memory because that 1800 // method might reduce the allocation size. 1801 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1802 } 1803 1804 if (PrintGCDetails && Verbose) { 1805 // Cannot use gclog_or_tty yet. 1806 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1807 } 1808 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1809 } 1810 1811 // If the minimum or initial heap_size have not been set or requested to be set 1812 // ergonomically, set them accordingly. 1813 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1814 julong reasonable_minimum = (julong)(OldSize + NewSize); 1815 1816 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1817 1818 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1819 1820 if (InitialHeapSize == 0) { 1821 julong reasonable_initial = phys_mem / InitialRAMFraction; 1822 1823 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1824 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1825 1826 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1827 1828 if (PrintGCDetails && Verbose) { 1829 // Cannot use gclog_or_tty yet. 1830 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1831 } 1832 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1833 } 1834 // If the minimum heap size has not been set (via -Xms), 1835 // synchronize with InitialHeapSize to avoid errors with the default value. 1836 if (min_heap_size() == 0) { 1837 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1838 if (PrintGCDetails && Verbose) { 1839 // Cannot use gclog_or_tty yet. 1840 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1841 } 1842 } 1843 } 1844 } 1845 1846 // This must be called after ergonomics because we want bytecode rewriting 1847 // if the server compiler is used, or if UseSharedSpaces is disabled. 1848 void Arguments::set_bytecode_flags() { 1849 // Better not attempt to store into a read-only space. 1850 if (UseSharedSpaces) { 1851 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1852 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1853 } 1854 1855 if (!RewriteBytecodes) { 1856 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1857 } 1858 } 1859 1860 // Aggressive optimization flags -XX:+AggressiveOpts 1861 void Arguments::set_aggressive_opts_flags() { 1862 #ifdef COMPILER2 1863 if (AggressiveUnboxing) { 1864 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1865 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1866 } else if (!EliminateAutoBox) { 1867 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1868 AggressiveUnboxing = false; 1869 } 1870 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1871 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1872 } else if (!DoEscapeAnalysis) { 1873 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1874 AggressiveUnboxing = false; 1875 } 1876 } 1877 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1878 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1879 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1880 } 1881 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1882 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1883 } 1884 1885 // Feed the cache size setting into the JDK 1886 char buffer[1024]; 1887 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1888 add_property(buffer); 1889 } 1890 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1891 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1892 } 1893 #endif 1894 1895 if (AggressiveOpts) { 1896 // Sample flag setting code 1897 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1898 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1899 // } 1900 } 1901 } 1902 1903 //=========================================================================================================== 1904 // Parsing of java.compiler property 1905 1906 void Arguments::process_java_compiler_argument(char* arg) { 1907 // For backwards compatibility, Djava.compiler=NONE or "" 1908 // causes us to switch to -Xint mode UNLESS -Xdebug 1909 // is also specified. 1910 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1911 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1912 } 1913 } 1914 1915 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1916 _sun_java_launcher = strdup(launcher); 1917 if (strcmp("gamma", _sun_java_launcher) == 0) { 1918 _created_by_gamma_launcher = true; 1919 } 1920 } 1921 1922 bool Arguments::created_by_java_launcher() { 1923 assert(_sun_java_launcher != NULL, "property must have value"); 1924 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1925 } 1926 1927 bool Arguments::created_by_gamma_launcher() { 1928 return _created_by_gamma_launcher; 1929 } 1930 1931 //=========================================================================================================== 1932 // Parsing of main arguments 1933 1934 bool Arguments::verify_interval(uintx val, uintx min, 1935 uintx max, const char* name) { 1936 // Returns true iff value is in the inclusive interval [min..max] 1937 // false, otherwise. 1938 if (val >= min && val <= max) { 1939 return true; 1940 } 1941 jio_fprintf(defaultStream::error_stream(), 1942 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1943 " and " UINTX_FORMAT "\n", 1944 name, val, min, max); 1945 return false; 1946 } 1947 1948 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1949 // Returns true if given value is at least specified min threshold 1950 // false, otherwise. 1951 if (val >= min ) { 1952 return true; 1953 } 1954 jio_fprintf(defaultStream::error_stream(), 1955 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1956 name, val, min); 1957 return false; 1958 } 1959 1960 bool Arguments::verify_percentage(uintx value, const char* name) { 1961 if (is_percentage(value)) { 1962 return true; 1963 } 1964 jio_fprintf(defaultStream::error_stream(), 1965 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1966 name, value); 1967 return false; 1968 } 1969 1970 // check if do gclog rotation 1971 // +UseGCLogFileRotation is a must, 1972 // no gc log rotation when log file not supplied or 1973 // NumberOfGCLogFiles is 0 1974 void check_gclog_consistency() { 1975 if (UseGCLogFileRotation) { 1976 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1977 jio_fprintf(defaultStream::output_stream(), 1978 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1979 "where num_of_file > 0\n" 1980 "GC log rotation is turned off\n"); 1981 UseGCLogFileRotation = false; 1982 } 1983 } 1984 1985 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1986 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1987 jio_fprintf(defaultStream::output_stream(), 1988 "GCLogFileSize changed to minimum 8K\n"); 1989 } 1990 } 1991 1992 // This function is called for -Xloggc:<filename>, it can be used 1993 // to check if a given file name(or string) conforms to the following 1994 // specification: 1995 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1996 // %p and %t only allowed once. We only limit usage of filename not path 1997 bool is_filename_valid(const char *file_name) { 1998 const char* p = file_name; 1999 char file_sep = os::file_separator()[0]; 2000 const char* cp; 2001 // skip prefix path 2002 for (cp = file_name; *cp != '\0'; cp++) { 2003 if (*cp == '/' || *cp == file_sep) { 2004 p = cp + 1; 2005 } 2006 } 2007 2008 int count_p = 0; 2009 int count_t = 0; 2010 while (*p != '\0') { 2011 if ((*p >= '0' && *p <= '9') || 2012 (*p >= 'A' && *p <= 'Z') || 2013 (*p >= 'a' && *p <= 'z') || 2014 *p == '-' || 2015 *p == '_' || 2016 *p == '.') { 2017 p++; 2018 continue; 2019 } 2020 if (*p == '%') { 2021 if(*(p + 1) == 'p') { 2022 p += 2; 2023 count_p ++; 2024 continue; 2025 } 2026 if (*(p + 1) == 't') { 2027 p += 2; 2028 count_t ++; 2029 continue; 2030 } 2031 } 2032 return false; 2033 } 2034 return count_p < 2 && count_t < 2; 2035 } 2036 2037 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2038 if (!is_percentage(min_heap_free_ratio)) { 2039 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2040 return false; 2041 } 2042 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2043 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2044 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2045 MaxHeapFreeRatio); 2046 return false; 2047 } 2048 // This does not set the flag itself, but stores the value in a safe place for later usage. 2049 _min_heap_free_ratio = min_heap_free_ratio; 2050 return true; 2051 } 2052 2053 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2054 if (!is_percentage(max_heap_free_ratio)) { 2055 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2056 return false; 2057 } 2058 if (max_heap_free_ratio < MinHeapFreeRatio) { 2059 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2060 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2061 MinHeapFreeRatio); 2062 return false; 2063 } 2064 // This does not set the flag itself, but stores the value in a safe place for later usage. 2065 _max_heap_free_ratio = max_heap_free_ratio; 2066 return true; 2067 } 2068 2069 // Check consistency of GC selection 2070 bool Arguments::check_gc_consistency_user() { 2071 check_gclog_consistency(); 2072 bool status = true; 2073 // Ensure that the user has not selected conflicting sets 2074 // of collectors. [Note: this check is merely a user convenience; 2075 // collectors over-ride each other so that only a non-conflicting 2076 // set is selected; however what the user gets is not what they 2077 // may have expected from the combination they asked for. It's 2078 // better to reduce user confusion by not allowing them to 2079 // select conflicting combinations. 2080 uint i = 0; 2081 if (UseSerialGC) i++; 2082 if (UseConcMarkSweepGC || UseParNewGC) i++; 2083 if (UseParallelGC || UseParallelOldGC) i++; 2084 if (UseG1GC) i++; 2085 if (i > 1) { 2086 jio_fprintf(defaultStream::error_stream(), 2087 "Conflicting collector combinations in option list; " 2088 "please refer to the release notes for the combinations " 2089 "allowed\n"); 2090 status = false; 2091 } 2092 return status; 2093 } 2094 2095 void Arguments::check_deprecated_gcs() { 2096 if (UseConcMarkSweepGC && !UseParNewGC) { 2097 warning("Using the DefNew young collector with the CMS collector is deprecated " 2098 "and will likely be removed in a future release"); 2099 } 2100 2101 if (UseParNewGC && !UseConcMarkSweepGC) { 2102 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2103 // set up UseSerialGC properly, so that can't be used in the check here. 2104 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2105 "and will likely be removed in a future release"); 2106 } 2107 2108 if (CMSIncrementalMode) { 2109 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2110 } 2111 } 2112 2113 void Arguments::check_deprecated_gc_flags() { 2114 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2115 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2116 "and will likely be removed in future release"); 2117 } 2118 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2119 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2120 "Use MaxRAMFraction instead."); 2121 } 2122 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2123 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2124 } 2125 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2126 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2127 } 2128 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2129 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2130 } 2131 } 2132 2133 // Check stack pages settings 2134 bool Arguments::check_stack_pages() 2135 { 2136 bool status = true; 2137 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2138 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2139 // greater stack shadow pages can't generate instruction to bang stack 2140 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2141 return status; 2142 } 2143 2144 // Check the consistency of vm_init_args 2145 bool Arguments::check_vm_args_consistency() { 2146 // Method for adding checks for flag consistency. 2147 // The intent is to warn the user of all possible conflicts, 2148 // before returning an error. 2149 // Note: Needs platform-dependent factoring. 2150 bool status = true; 2151 2152 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 2153 // builds so the cost of stack banging can be measured. 2154 #if (defined(PRODUCT) && defined(SOLARIS)) 2155 if (!UseBoundThreads && !UseStackBanging) { 2156 jio_fprintf(defaultStream::error_stream(), 2157 "-UseStackBanging conflicts with -UseBoundThreads\n"); 2158 2159 status = false; 2160 } 2161 #endif 2162 2163 if (TLABRefillWasteFraction == 0) { 2164 jio_fprintf(defaultStream::error_stream(), 2165 "TLABRefillWasteFraction should be a denominator, " 2166 "not " SIZE_FORMAT "\n", 2167 TLABRefillWasteFraction); 2168 status = false; 2169 } 2170 2171 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2172 "AdaptiveSizePolicyWeight"); 2173 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2174 2175 // Divide by bucket size to prevent a large size from causing rollover when 2176 // calculating amount of memory needed to be allocated for the String table. 2177 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2178 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2179 2180 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2181 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2182 2183 { 2184 // Using "else if" below to avoid printing two error messages if min > max. 2185 // This will also prevent us from reporting both min>100 and max>100 at the 2186 // same time, but that is less annoying than printing two identical errors IMHO. 2187 FormatBuffer<80> err_msg("%s",""); 2188 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2189 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2190 status = false; 2191 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2192 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2193 status = false; 2194 } 2195 } 2196 2197 // Min/MaxMetaspaceFreeRatio 2198 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2199 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2200 2201 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2202 jio_fprintf(defaultStream::error_stream(), 2203 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2204 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2205 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2206 MinMetaspaceFreeRatio, 2207 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2208 MaxMetaspaceFreeRatio); 2209 status = false; 2210 } 2211 2212 // Trying to keep 100% free is not practical 2213 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2214 2215 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2216 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2217 } 2218 2219 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2220 // Settings to encourage splitting. 2221 if (!FLAG_IS_CMDLINE(NewRatio)) { 2222 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2223 } 2224 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2225 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2226 } 2227 } 2228 2229 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2230 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2231 if (GCTimeLimit == 100) { 2232 // Turn off gc-overhead-limit-exceeded checks 2233 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2234 } 2235 2236 status = status && ArgumentsExt::check_gc_consistency_user(); 2237 status = status && check_stack_pages(); 2238 2239 if (CMSIncrementalMode) { 2240 if (!UseConcMarkSweepGC) { 2241 jio_fprintf(defaultStream::error_stream(), 2242 "error: invalid argument combination.\n" 2243 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2244 "selected in order\nto use CMSIncrementalMode.\n"); 2245 status = false; 2246 } else { 2247 status = status && verify_percentage(CMSIncrementalDutyCycle, 2248 "CMSIncrementalDutyCycle"); 2249 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2250 "CMSIncrementalDutyCycleMin"); 2251 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2252 "CMSIncrementalSafetyFactor"); 2253 status = status && verify_percentage(CMSIncrementalOffset, 2254 "CMSIncrementalOffset"); 2255 status = status && verify_percentage(CMSExpAvgFactor, 2256 "CMSExpAvgFactor"); 2257 // If it was not set on the command line, set 2258 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2259 if (CMSInitiatingOccupancyFraction < 0) { 2260 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2261 } 2262 } 2263 } 2264 2265 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2266 // insists that we hold the requisite locks so that the iteration is 2267 // MT-safe. For the verification at start-up and shut-down, we don't 2268 // yet have a good way of acquiring and releasing these locks, 2269 // which are not visible at the CollectedHeap level. We want to 2270 // be able to acquire these locks and then do the iteration rather 2271 // than just disable the lock verification. This will be fixed under 2272 // bug 4788986. 2273 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2274 if (VerifyDuringStartup) { 2275 warning("Heap verification at start-up disabled " 2276 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2277 VerifyDuringStartup = false; // Disable verification at start-up 2278 } 2279 2280 if (VerifyBeforeExit) { 2281 warning("Heap verification at shutdown disabled " 2282 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2283 VerifyBeforeExit = false; // Disable verification at shutdown 2284 } 2285 } 2286 2287 // Note: only executed in non-PRODUCT mode 2288 if (!UseAsyncConcMarkSweepGC && 2289 (ExplicitGCInvokesConcurrent || 2290 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2291 jio_fprintf(defaultStream::error_stream(), 2292 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2293 " with -UseAsyncConcMarkSweepGC"); 2294 status = false; 2295 } 2296 2297 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2298 2299 #if INCLUDE_ALL_GCS 2300 if (UseG1GC) { 2301 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2302 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2303 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2304 2305 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2306 "InitiatingHeapOccupancyPercent"); 2307 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2308 "G1RefProcDrainInterval"); 2309 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2310 "G1ConcMarkStepDurationMillis"); 2311 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2312 "G1ConcRSHotCardLimit"); 2313 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2314 "G1ConcRSLogCacheSize"); 2315 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2316 "StringDeduplicationAgeThreshold"); 2317 } 2318 if (UseConcMarkSweepGC) { 2319 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2320 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2321 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2322 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2323 2324 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2325 2326 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2327 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2328 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2329 2330 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2331 2332 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2333 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2334 2335 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2336 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2337 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2338 2339 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2340 2341 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2342 2343 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2344 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2345 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2346 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2347 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2348 } 2349 2350 if (UseParallelGC || UseParallelOldGC) { 2351 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2352 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2353 2354 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2355 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2356 2357 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2358 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2359 2360 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2361 2362 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2363 } 2364 #endif // INCLUDE_ALL_GCS 2365 2366 status = status && verify_interval(RefDiscoveryPolicy, 2367 ReferenceProcessor::DiscoveryPolicyMin, 2368 ReferenceProcessor::DiscoveryPolicyMax, 2369 "RefDiscoveryPolicy"); 2370 2371 // Limit the lower bound of this flag to 1 as it is used in a division 2372 // expression. 2373 status = status && verify_interval(TLABWasteTargetPercent, 2374 1, 100, "TLABWasteTargetPercent"); 2375 2376 status = status && verify_object_alignment(); 2377 2378 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2379 "CompressedClassSpaceSize"); 2380 2381 status = status && verify_interval(MarkStackSizeMax, 2382 1, (max_jint - 1), "MarkStackSizeMax"); 2383 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2384 2385 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2386 2387 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2388 2389 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2390 2391 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2392 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2393 2394 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2395 2396 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2397 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2398 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2399 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2400 2401 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2402 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2403 2404 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2405 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2406 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2407 2408 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2409 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2410 2411 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2412 // just for that, so hardcode here. 2413 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2414 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2415 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2416 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2417 2418 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2419 #ifdef COMPILER1 2420 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2421 #endif 2422 2423 if (PrintNMTStatistics) { 2424 #if INCLUDE_NMT 2425 if (MemTracker::tracking_level() == NMT_off) { 2426 #endif // INCLUDE_NMT 2427 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2428 PrintNMTStatistics = false; 2429 #if INCLUDE_NMT 2430 } 2431 #endif 2432 } 2433 2434 // Need to limit the extent of the padding to reasonable size. 2435 // 8K is well beyond the reasonable HW cache line size, even with the 2436 // aggressive prefetching, while still leaving the room for segregating 2437 // among the distinct pages. 2438 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2439 jio_fprintf(defaultStream::error_stream(), 2440 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2441 ContendedPaddingWidth, 0, 8192); 2442 status = false; 2443 } 2444 2445 // Need to enforce the padding not to break the existing field alignments. 2446 // It is sufficient to check against the largest type size. 2447 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2448 jio_fprintf(defaultStream::error_stream(), 2449 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2450 ContendedPaddingWidth, BytesPerLong); 2451 status = false; 2452 } 2453 2454 // Check lower bounds of the code cache 2455 // Template Interpreter code is approximately 3X larger in debug builds. 2456 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2457 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2458 jio_fprintf(defaultStream::error_stream(), 2459 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2460 os::vm_page_size()/K); 2461 status = false; 2462 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2463 jio_fprintf(defaultStream::error_stream(), 2464 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2465 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2466 status = false; 2467 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2468 jio_fprintf(defaultStream::error_stream(), 2469 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2470 min_code_cache_size/K); 2471 status = false; 2472 } else if (ReservedCodeCacheSize > 2*G) { 2473 // Code cache size larger than MAXINT is not supported. 2474 jio_fprintf(defaultStream::error_stream(), 2475 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2476 (2*G)/M); 2477 status = false; 2478 } 2479 2480 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2481 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2482 2483 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2484 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2485 } 2486 2487 #ifdef COMPILER1 2488 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset"); 2489 #endif 2490 2491 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2492 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2493 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2494 // Check the minimum number of compiler threads 2495 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2496 2497 return status; 2498 } 2499 2500 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2501 const char* option_type) { 2502 if (ignore) return false; 2503 2504 const char* spacer = " "; 2505 if (option_type == NULL) { 2506 option_type = ++spacer; // Set both to the empty string. 2507 } 2508 2509 if (os::obsolete_option(option)) { 2510 jio_fprintf(defaultStream::error_stream(), 2511 "Obsolete %s%soption: %s\n", option_type, spacer, 2512 option->optionString); 2513 return false; 2514 } else { 2515 jio_fprintf(defaultStream::error_stream(), 2516 "Unrecognized %s%soption: %s\n", option_type, spacer, 2517 option->optionString); 2518 return true; 2519 } 2520 } 2521 2522 static const char* user_assertion_options[] = { 2523 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2524 }; 2525 2526 static const char* system_assertion_options[] = { 2527 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2528 }; 2529 2530 // Return true if any of the strings in null-terminated array 'names' matches. 2531 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2532 // the option must match exactly. 2533 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2534 bool tail_allowed) { 2535 for (/* empty */; *names != NULL; ++names) { 2536 if (match_option(option, *names, tail)) { 2537 if (**tail == '\0' || tail_allowed && **tail == ':') { 2538 return true; 2539 } 2540 } 2541 } 2542 return false; 2543 } 2544 2545 bool Arguments::parse_uintx(const char* value, 2546 uintx* uintx_arg, 2547 uintx min_size) { 2548 2549 // Check the sign first since atomull() parses only unsigned values. 2550 bool value_is_positive = !(*value == '-'); 2551 2552 if (value_is_positive) { 2553 julong n; 2554 bool good_return = atomull(value, &n); 2555 if (good_return) { 2556 bool above_minimum = n >= min_size; 2557 bool value_is_too_large = n > max_uintx; 2558 2559 if (above_minimum && !value_is_too_large) { 2560 *uintx_arg = n; 2561 return true; 2562 } 2563 } 2564 } 2565 return false; 2566 } 2567 2568 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2569 julong* long_arg, 2570 julong min_size) { 2571 if (!atomull(s, long_arg)) return arg_unreadable; 2572 return check_memory_size(*long_arg, min_size); 2573 } 2574 2575 // Parse JavaVMInitArgs structure 2576 2577 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2578 // For components of the system classpath. 2579 SysClassPath scp(Arguments::get_sysclasspath()); 2580 bool scp_assembly_required = false; 2581 2582 // Save default settings for some mode flags 2583 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2584 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2585 Arguments::_ClipInlining = ClipInlining; 2586 Arguments::_BackgroundCompilation = BackgroundCompilation; 2587 2588 // Setup flags for mixed which is the default 2589 set_mode_flags(_mixed); 2590 2591 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2592 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2593 if (result != JNI_OK) { 2594 return result; 2595 } 2596 2597 // Parse JavaVMInitArgs structure passed in 2598 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2599 if (result != JNI_OK) { 2600 return result; 2601 } 2602 2603 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2604 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2605 if (result != JNI_OK) { 2606 return result; 2607 } 2608 2609 // Do final processing now that all arguments have been parsed 2610 result = finalize_vm_init_args(&scp, scp_assembly_required); 2611 if (result != JNI_OK) { 2612 return result; 2613 } 2614 2615 return JNI_OK; 2616 } 2617 2618 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2619 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2620 // are dealing with -agentpath (case where name is a path), otherwise with 2621 // -agentlib 2622 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2623 char *_name; 2624 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2625 size_t _len_hprof, _len_jdwp, _len_prefix; 2626 2627 if (is_path) { 2628 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2629 return false; 2630 } 2631 2632 _name++; // skip past last path separator 2633 _len_prefix = strlen(JNI_LIB_PREFIX); 2634 2635 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2636 return false; 2637 } 2638 2639 _name += _len_prefix; 2640 _len_hprof = strlen(_hprof); 2641 _len_jdwp = strlen(_jdwp); 2642 2643 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2644 _name += _len_hprof; 2645 } 2646 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2647 _name += _len_jdwp; 2648 } 2649 else { 2650 return false; 2651 } 2652 2653 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2654 return false; 2655 } 2656 2657 return true; 2658 } 2659 2660 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2661 return true; 2662 } 2663 2664 return false; 2665 } 2666 2667 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2668 SysClassPath* scp_p, 2669 bool* scp_assembly_required_p, 2670 Flag::Flags origin) { 2671 // Remaining part of option string 2672 const char* tail; 2673 2674 // iterate over arguments 2675 for (int index = 0; index < args->nOptions; index++) { 2676 bool is_absolute_path = false; // for -agentpath vs -agentlib 2677 2678 const JavaVMOption* option = args->options + index; 2679 2680 if (!match_option(option, "-Djava.class.path", &tail) && 2681 !match_option(option, "-Dsun.java.command", &tail) && 2682 !match_option(option, "-Dsun.java.launcher", &tail)) { 2683 2684 // add all jvm options to the jvm_args string. This string 2685 // is used later to set the java.vm.args PerfData string constant. 2686 // the -Djava.class.path and the -Dsun.java.command options are 2687 // omitted from jvm_args string as each have their own PerfData 2688 // string constant object. 2689 build_jvm_args(option->optionString); 2690 } 2691 2692 // -verbose:[class/gc/jni] 2693 if (match_option(option, "-verbose", &tail)) { 2694 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2695 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2696 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2697 } else if (!strcmp(tail, ":gc")) { 2698 FLAG_SET_CMDLINE(bool, PrintGC, true); 2699 } else if (!strcmp(tail, ":jni")) { 2700 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2701 } 2702 // -da / -ea / -disableassertions / -enableassertions 2703 // These accept an optional class/package name separated by a colon, e.g., 2704 // -da:java.lang.Thread. 2705 } else if (match_option(option, user_assertion_options, &tail, true)) { 2706 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2707 if (*tail == '\0') { 2708 JavaAssertions::setUserClassDefault(enable); 2709 } else { 2710 assert(*tail == ':', "bogus match by match_option()"); 2711 JavaAssertions::addOption(tail + 1, enable); 2712 } 2713 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2714 } else if (match_option(option, system_assertion_options, &tail, false)) { 2715 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2716 JavaAssertions::setSystemClassDefault(enable); 2717 // -bootclasspath: 2718 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2719 scp_p->reset_path(tail); 2720 *scp_assembly_required_p = true; 2721 // -bootclasspath/a: 2722 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2723 scp_p->add_suffix(tail); 2724 *scp_assembly_required_p = true; 2725 // -bootclasspath/p: 2726 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2727 scp_p->add_prefix(tail); 2728 *scp_assembly_required_p = true; 2729 // -Xrun 2730 } else if (match_option(option, "-Xrun", &tail)) { 2731 if (tail != NULL) { 2732 const char* pos = strchr(tail, ':'); 2733 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2734 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2735 name[len] = '\0'; 2736 2737 char *options = NULL; 2738 if(pos != NULL) { 2739 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2740 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2741 } 2742 #if !INCLUDE_JVMTI 2743 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2744 jio_fprintf(defaultStream::error_stream(), 2745 "Profiling and debugging agents are not supported in this VM\n"); 2746 return JNI_ERR; 2747 } 2748 #endif // !INCLUDE_JVMTI 2749 add_init_library(name, options); 2750 } 2751 // -agentlib and -agentpath 2752 } else if (match_option(option, "-agentlib:", &tail) || 2753 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2754 if(tail != NULL) { 2755 const char* pos = strchr(tail, '='); 2756 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2757 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2758 name[len] = '\0'; 2759 2760 char *options = NULL; 2761 if(pos != NULL) { 2762 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2763 } 2764 #if !INCLUDE_JVMTI 2765 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2766 jio_fprintf(defaultStream::error_stream(), 2767 "Profiling and debugging agents are not supported in this VM\n"); 2768 return JNI_ERR; 2769 } 2770 #endif // !INCLUDE_JVMTI 2771 add_init_agent(name, options, is_absolute_path); 2772 } 2773 // -javaagent 2774 } else if (match_option(option, "-javaagent:", &tail)) { 2775 #if !INCLUDE_JVMTI 2776 jio_fprintf(defaultStream::error_stream(), 2777 "Instrumentation agents are not supported in this VM\n"); 2778 return JNI_ERR; 2779 #else 2780 if(tail != NULL) { 2781 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2782 add_init_agent("instrument", options, false); 2783 } 2784 #endif // !INCLUDE_JVMTI 2785 // -Xnoclassgc 2786 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2787 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2788 // -Xincgc: i-CMS 2789 } else if (match_option(option, "-Xincgc", &tail)) { 2790 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2791 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2792 // -Xnoincgc: no i-CMS 2793 } else if (match_option(option, "-Xnoincgc", &tail)) { 2794 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2795 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2796 // -Xconcgc 2797 } else if (match_option(option, "-Xconcgc", &tail)) { 2798 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2799 // -Xnoconcgc 2800 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2801 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2802 // -Xbatch 2803 } else if (match_option(option, "-Xbatch", &tail)) { 2804 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2805 // -Xmn for compatibility with other JVM vendors 2806 } else if (match_option(option, "-Xmn", &tail)) { 2807 julong long_initial_young_size = 0; 2808 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2809 if (errcode != arg_in_range) { 2810 jio_fprintf(defaultStream::error_stream(), 2811 "Invalid initial young generation size: %s\n", option->optionString); 2812 describe_range_error(errcode); 2813 return JNI_EINVAL; 2814 } 2815 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2816 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2817 // -Xms 2818 } else if (match_option(option, "-Xms", &tail)) { 2819 julong long_initial_heap_size = 0; 2820 // an initial heap size of 0 means automatically determine 2821 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2822 if (errcode != arg_in_range) { 2823 jio_fprintf(defaultStream::error_stream(), 2824 "Invalid initial heap size: %s\n", option->optionString); 2825 describe_range_error(errcode); 2826 return JNI_EINVAL; 2827 } 2828 set_min_heap_size((uintx)long_initial_heap_size); 2829 // Currently the minimum size and the initial heap sizes are the same. 2830 // Can be overridden with -XX:InitialHeapSize. 2831 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2832 // -Xmx 2833 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2834 julong long_max_heap_size = 0; 2835 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2836 if (errcode != arg_in_range) { 2837 jio_fprintf(defaultStream::error_stream(), 2838 "Invalid maximum heap size: %s\n", option->optionString); 2839 describe_range_error(errcode); 2840 return JNI_EINVAL; 2841 } 2842 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2843 // Xmaxf 2844 } else if (match_option(option, "-Xmaxf", &tail)) { 2845 char* err; 2846 int maxf = (int)(strtod(tail, &err) * 100); 2847 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2848 jio_fprintf(defaultStream::error_stream(), 2849 "Bad max heap free percentage size: %s\n", 2850 option->optionString); 2851 return JNI_EINVAL; 2852 } else { 2853 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2854 } 2855 // Xminf 2856 } else if (match_option(option, "-Xminf", &tail)) { 2857 char* err; 2858 int minf = (int)(strtod(tail, &err) * 100); 2859 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2860 jio_fprintf(defaultStream::error_stream(), 2861 "Bad min heap free percentage size: %s\n", 2862 option->optionString); 2863 return JNI_EINVAL; 2864 } else { 2865 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2866 } 2867 // -Xss 2868 } else if (match_option(option, "-Xss", &tail)) { 2869 julong long_ThreadStackSize = 0; 2870 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2871 if (errcode != arg_in_range) { 2872 jio_fprintf(defaultStream::error_stream(), 2873 "Invalid thread stack size: %s\n", option->optionString); 2874 describe_range_error(errcode); 2875 return JNI_EINVAL; 2876 } 2877 // Internally track ThreadStackSize in units of 1024 bytes. 2878 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2879 round_to((int)long_ThreadStackSize, K) / K); 2880 // -Xoss 2881 } else if (match_option(option, "-Xoss", &tail)) { 2882 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2883 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2884 julong long_CodeCacheExpansionSize = 0; 2885 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2886 if (errcode != arg_in_range) { 2887 jio_fprintf(defaultStream::error_stream(), 2888 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2889 os::vm_page_size()/K); 2890 return JNI_EINVAL; 2891 } 2892 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2893 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2894 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2895 julong long_ReservedCodeCacheSize = 0; 2896 2897 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2898 if (errcode != arg_in_range) { 2899 jio_fprintf(defaultStream::error_stream(), 2900 "Invalid maximum code cache size: %s.\n", option->optionString); 2901 return JNI_EINVAL; 2902 } 2903 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2904 //-XX:IncreaseFirstTierCompileThresholdAt= 2905 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2906 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2907 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2908 jio_fprintf(defaultStream::error_stream(), 2909 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2910 option->optionString); 2911 return JNI_EINVAL; 2912 } 2913 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2914 // -green 2915 } else if (match_option(option, "-green", &tail)) { 2916 jio_fprintf(defaultStream::error_stream(), 2917 "Green threads support not available\n"); 2918 return JNI_EINVAL; 2919 // -native 2920 } else if (match_option(option, "-native", &tail)) { 2921 // HotSpot always uses native threads, ignore silently for compatibility 2922 // -Xsqnopause 2923 } else if (match_option(option, "-Xsqnopause", &tail)) { 2924 // EVM option, ignore silently for compatibility 2925 // -Xrs 2926 } else if (match_option(option, "-Xrs", &tail)) { 2927 // Classic/EVM option, new functionality 2928 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2929 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2930 // change default internal VM signals used - lower case for back compat 2931 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2932 // -Xoptimize 2933 } else if (match_option(option, "-Xoptimize", &tail)) { 2934 // EVM option, ignore silently for compatibility 2935 // -Xprof 2936 } else if (match_option(option, "-Xprof", &tail)) { 2937 #if INCLUDE_FPROF 2938 _has_profile = true; 2939 #else // INCLUDE_FPROF 2940 jio_fprintf(defaultStream::error_stream(), 2941 "Flat profiling is not supported in this VM.\n"); 2942 return JNI_ERR; 2943 #endif // INCLUDE_FPROF 2944 // -Xconcurrentio 2945 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2946 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2947 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2948 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2949 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2950 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2951 2952 // -Xinternalversion 2953 } else if (match_option(option, "-Xinternalversion", &tail)) { 2954 jio_fprintf(defaultStream::output_stream(), "%s\n", 2955 VM_Version::internal_vm_info_string()); 2956 vm_exit(0); 2957 #ifndef PRODUCT 2958 // -Xprintflags 2959 } else if (match_option(option, "-Xprintflags", &tail)) { 2960 CommandLineFlags::printFlags(tty, false); 2961 vm_exit(0); 2962 #endif 2963 // -D 2964 } else if (match_option(option, "-D", &tail)) { 2965 if (!add_property(tail)) { 2966 return JNI_ENOMEM; 2967 } 2968 // Out of the box management support 2969 if (match_option(option, "-Dcom.sun.management", &tail)) { 2970 #if INCLUDE_MANAGEMENT 2971 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2972 #else 2973 jio_fprintf(defaultStream::output_stream(), 2974 "-Dcom.sun.management is not supported in this VM.\n"); 2975 return JNI_ERR; 2976 #endif 2977 } 2978 // -Xint 2979 } else if (match_option(option, "-Xint", &tail)) { 2980 set_mode_flags(_int); 2981 // -Xmixed 2982 } else if (match_option(option, "-Xmixed", &tail)) { 2983 set_mode_flags(_mixed); 2984 // -Xcomp 2985 } else if (match_option(option, "-Xcomp", &tail)) { 2986 // for testing the compiler; turn off all flags that inhibit compilation 2987 set_mode_flags(_comp); 2988 // -Xshare:dump 2989 } else if (match_option(option, "-Xshare:dump", &tail)) { 2990 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2991 set_mode_flags(_int); // Prevent compilation, which creates objects 2992 // -Xshare:on 2993 } else if (match_option(option, "-Xshare:on", &tail)) { 2994 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2995 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2996 // -Xshare:auto 2997 } else if (match_option(option, "-Xshare:auto", &tail)) { 2998 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2999 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3000 // -Xshare:off 3001 } else if (match_option(option, "-Xshare:off", &tail)) { 3002 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3003 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3004 // -Xverify 3005 } else if (match_option(option, "-Xverify", &tail)) { 3006 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3007 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3008 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3009 } else if (strcmp(tail, ":remote") == 0) { 3010 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3011 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3012 } else if (strcmp(tail, ":none") == 0) { 3013 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3014 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3015 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3016 return JNI_EINVAL; 3017 } 3018 // -Xdebug 3019 } else if (match_option(option, "-Xdebug", &tail)) { 3020 // note this flag has been used, then ignore 3021 set_xdebug_mode(true); 3022 // -Xnoagent 3023 } else if (match_option(option, "-Xnoagent", &tail)) { 3024 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3025 } else if (match_option(option, "-Xboundthreads", &tail)) { 3026 // Bind user level threads to kernel threads (Solaris only) 3027 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3028 } else if (match_option(option, "-Xloggc:", &tail)) { 3029 // Redirect GC output to the file. -Xloggc:<filename> 3030 // ostream_init_log(), when called will use this filename 3031 // to initialize a fileStream. 3032 _gc_log_filename = strdup(tail); 3033 if (!is_filename_valid(_gc_log_filename)) { 3034 jio_fprintf(defaultStream::output_stream(), 3035 "Invalid file name for use with -Xloggc: Filename can only contain the " 3036 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3037 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3038 return JNI_EINVAL; 3039 } 3040 FLAG_SET_CMDLINE(bool, PrintGC, true); 3041 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3042 3043 // JNI hooks 3044 } else if (match_option(option, "-Xcheck", &tail)) { 3045 if (!strcmp(tail, ":jni")) { 3046 #if !INCLUDE_JNI_CHECK 3047 warning("JNI CHECKING is not supported in this VM"); 3048 #else 3049 CheckJNICalls = true; 3050 #endif // INCLUDE_JNI_CHECK 3051 } else if (is_bad_option(option, args->ignoreUnrecognized, 3052 "check")) { 3053 return JNI_EINVAL; 3054 } 3055 } else if (match_option(option, "vfprintf", &tail)) { 3056 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3057 } else if (match_option(option, "exit", &tail)) { 3058 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3059 } else if (match_option(option, "abort", &tail)) { 3060 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3061 // -XX:+AggressiveHeap 3062 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 3063 3064 // This option inspects the machine and attempts to set various 3065 // parameters to be optimal for long-running, memory allocation 3066 // intensive jobs. It is intended for machines with large 3067 // amounts of cpu and memory. 3068 3069 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3070 // VM, but we may not be able to represent the total physical memory 3071 // available (like having 8gb of memory on a box but using a 32bit VM). 3072 // Thus, we need to make sure we're using a julong for intermediate 3073 // calculations. 3074 julong initHeapSize; 3075 julong total_memory = os::physical_memory(); 3076 3077 if (total_memory < (julong)256*M) { 3078 jio_fprintf(defaultStream::error_stream(), 3079 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3080 vm_exit(1); 3081 } 3082 3083 // The heap size is half of available memory, or (at most) 3084 // all of possible memory less 160mb (leaving room for the OS 3085 // when using ISM). This is the maximum; because adaptive sizing 3086 // is turned on below, the actual space used may be smaller. 3087 3088 initHeapSize = MIN2(total_memory / (julong)2, 3089 total_memory - (julong)160*M); 3090 3091 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3092 3093 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3094 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3095 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3096 // Currently the minimum size and the initial heap sizes are the same. 3097 set_min_heap_size(initHeapSize); 3098 } 3099 if (FLAG_IS_DEFAULT(NewSize)) { 3100 // Make the young generation 3/8ths of the total heap. 3101 FLAG_SET_CMDLINE(uintx, NewSize, 3102 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3103 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3104 } 3105 3106 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3107 FLAG_SET_DEFAULT(UseLargePages, true); 3108 #endif 3109 3110 // Increase some data structure sizes for efficiency 3111 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3112 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3113 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3114 3115 // See the OldPLABSize comment below, but replace 'after promotion' 3116 // with 'after copying'. YoungPLABSize is the size of the survivor 3117 // space per-gc-thread buffers. The default is 4kw. 3118 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3119 3120 // OldPLABSize is the size of the buffers in the old gen that 3121 // UseParallelGC uses to promote live data that doesn't fit in the 3122 // survivor spaces. At any given time, there's one for each gc thread. 3123 // The default size is 1kw. These buffers are rarely used, since the 3124 // survivor spaces are usually big enough. For specjbb, however, there 3125 // are occasions when there's lots of live data in the young gen 3126 // and we end up promoting some of it. We don't have a definite 3127 // explanation for why bumping OldPLABSize helps, but the theory 3128 // is that a bigger PLAB results in retaining something like the 3129 // original allocation order after promotion, which improves mutator 3130 // locality. A minor effect may be that larger PLABs reduce the 3131 // number of PLAB allocation events during gc. The value of 8kw 3132 // was arrived at by experimenting with specjbb. 3133 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3134 3135 // Enable parallel GC and adaptive generation sizing 3136 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3137 FLAG_SET_DEFAULT(ParallelGCThreads, 3138 Abstract_VM_Version::parallel_worker_threads()); 3139 3140 // Encourage steady state memory management 3141 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3142 3143 // This appears to improve mutator locality 3144 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3145 3146 // Get around early Solaris scheduling bug 3147 // (affinity vs other jobs on system) 3148 // but disallow DR and offlining (5008695). 3149 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3150 3151 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3152 // The last option must always win. 3153 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3154 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3155 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3156 // The last option must always win. 3157 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3158 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3159 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3160 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3161 jio_fprintf(defaultStream::error_stream(), 3162 "Please use CMSClassUnloadingEnabled in place of " 3163 "CMSPermGenSweepingEnabled in the future\n"); 3164 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3165 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3166 jio_fprintf(defaultStream::error_stream(), 3167 "Please use -XX:+UseGCOverheadLimit in place of " 3168 "-XX:+UseGCTimeLimit in the future\n"); 3169 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3170 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3171 jio_fprintf(defaultStream::error_stream(), 3172 "Please use -XX:-UseGCOverheadLimit in place of " 3173 "-XX:-UseGCTimeLimit in the future\n"); 3174 // The TLE options are for compatibility with 1.3 and will be 3175 // removed without notice in a future release. These options 3176 // are not to be documented. 3177 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3178 // No longer used. 3179 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3180 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3181 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3182 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3183 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3184 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3185 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3186 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3187 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3188 // No longer used. 3189 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3190 julong long_tlab_size = 0; 3191 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3192 if (errcode != arg_in_range) { 3193 jio_fprintf(defaultStream::error_stream(), 3194 "Invalid TLAB size: %s\n", option->optionString); 3195 describe_range_error(errcode); 3196 return JNI_EINVAL; 3197 } 3198 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3199 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3200 // No longer used. 3201 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3202 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3203 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3204 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3205 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3206 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3207 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3208 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3209 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3210 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3211 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3212 #if defined(DTRACE_ENABLED) 3213 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3214 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3215 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3216 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3217 #else // defined(DTRACE_ENABLED) 3218 jio_fprintf(defaultStream::error_stream(), 3219 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3220 return JNI_EINVAL; 3221 #endif // defined(DTRACE_ENABLED) 3222 #ifdef ASSERT 3223 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3224 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3225 // disable scavenge before parallel mark-compact 3226 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3227 #endif 3228 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3229 julong cms_blocks_to_claim = (julong)atol(tail); 3230 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3231 jio_fprintf(defaultStream::error_stream(), 3232 "Please use -XX:OldPLABSize in place of " 3233 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3234 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3235 julong cms_blocks_to_claim = (julong)atol(tail); 3236 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3237 jio_fprintf(defaultStream::error_stream(), 3238 "Please use -XX:OldPLABSize in place of " 3239 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3240 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3241 julong old_plab_size = 0; 3242 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3243 if (errcode != arg_in_range) { 3244 jio_fprintf(defaultStream::error_stream(), 3245 "Invalid old PLAB size: %s\n", option->optionString); 3246 describe_range_error(errcode); 3247 return JNI_EINVAL; 3248 } 3249 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3250 jio_fprintf(defaultStream::error_stream(), 3251 "Please use -XX:OldPLABSize in place of " 3252 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3253 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3254 julong young_plab_size = 0; 3255 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3256 if (errcode != arg_in_range) { 3257 jio_fprintf(defaultStream::error_stream(), 3258 "Invalid young PLAB size: %s\n", option->optionString); 3259 describe_range_error(errcode); 3260 return JNI_EINVAL; 3261 } 3262 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3263 jio_fprintf(defaultStream::error_stream(), 3264 "Please use -XX:YoungPLABSize in place of " 3265 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3266 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3267 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3268 julong stack_size = 0; 3269 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3270 if (errcode != arg_in_range) { 3271 jio_fprintf(defaultStream::error_stream(), 3272 "Invalid mark stack size: %s\n", option->optionString); 3273 describe_range_error(errcode); 3274 return JNI_EINVAL; 3275 } 3276 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3277 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3278 julong max_stack_size = 0; 3279 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3280 if (errcode != arg_in_range) { 3281 jio_fprintf(defaultStream::error_stream(), 3282 "Invalid maximum mark stack size: %s\n", 3283 option->optionString); 3284 describe_range_error(errcode); 3285 return JNI_EINVAL; 3286 } 3287 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3288 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3289 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3290 uintx conc_threads = 0; 3291 if (!parse_uintx(tail, &conc_threads, 1)) { 3292 jio_fprintf(defaultStream::error_stream(), 3293 "Invalid concurrent threads: %s\n", option->optionString); 3294 return JNI_EINVAL; 3295 } 3296 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3297 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3298 julong max_direct_memory_size = 0; 3299 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3300 if (errcode != arg_in_range) { 3301 jio_fprintf(defaultStream::error_stream(), 3302 "Invalid maximum direct memory size: %s\n", 3303 option->optionString); 3304 describe_range_error(errcode); 3305 return JNI_EINVAL; 3306 } 3307 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3308 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3309 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3310 // away and will cause VM initialization failures! 3311 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3312 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3313 #if !INCLUDE_MANAGEMENT 3314 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3315 jio_fprintf(defaultStream::error_stream(), 3316 "ManagementServer is not supported in this VM.\n"); 3317 return JNI_ERR; 3318 #endif // INCLUDE_MANAGEMENT 3319 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3320 // Skip -XX:Flags= since that case has already been handled 3321 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3322 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3323 return JNI_EINVAL; 3324 } 3325 } 3326 // Unknown option 3327 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3328 return JNI_ERR; 3329 } 3330 } 3331 3332 // PrintSharedArchiveAndExit will turn on 3333 // -Xshare:on 3334 // -XX:+TraceClassPaths 3335 if (PrintSharedArchiveAndExit) { 3336 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3337 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3338 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3339 } 3340 3341 // Change the default value for flags which have different default values 3342 // when working with older JDKs. 3343 #ifdef LINUX 3344 if (JDK_Version::current().compare_major(6) <= 0 && 3345 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3346 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3347 } 3348 #endif // LINUX 3349 fix_appclasspath(); 3350 return JNI_OK; 3351 } 3352 3353 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3354 // 3355 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3356 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3357 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3358 // path is treated as the current directory. 3359 // 3360 // This causes problems with CDS, which requires that all directories specified in the classpath 3361 // must be empty. In most cases, applications do NOT want to load classes from the current 3362 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3363 // scripts compatible with CDS. 3364 void Arguments::fix_appclasspath() { 3365 if (IgnoreEmptyClassPaths) { 3366 const char separator = *os::path_separator(); 3367 const char* src = _java_class_path->value(); 3368 3369 // skip over all the leading empty paths 3370 while (*src == separator) { 3371 src ++; 3372 } 3373 3374 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3375 strncpy(copy, src, strlen(src) + 1); 3376 3377 // trim all trailing empty paths 3378 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3379 *tail = '\0'; 3380 } 3381 3382 char from[3] = {separator, separator, '\0'}; 3383 char to [2] = {separator, '\0'}; 3384 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3385 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3386 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3387 } 3388 3389 _java_class_path->set_value(copy); 3390 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3391 } 3392 3393 if (!PrintSharedArchiveAndExit) { 3394 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3395 } 3396 } 3397 3398 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3399 // This must be done after all -D arguments have been processed. 3400 scp_p->expand_endorsed(); 3401 3402 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3403 // Assemble the bootclasspath elements into the final path. 3404 Arguments::set_sysclasspath(scp_p->combined_path()); 3405 } 3406 3407 // This must be done after all arguments have been processed. 3408 // java_compiler() true means set to "NONE" or empty. 3409 if (java_compiler() && !xdebug_mode()) { 3410 // For backwards compatibility, we switch to interpreted mode if 3411 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3412 // not specified. 3413 set_mode_flags(_int); 3414 } 3415 if (CompileThreshold == 0) { 3416 set_mode_flags(_int); 3417 } 3418 3419 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3420 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3421 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3422 } 3423 3424 #ifndef COMPILER2 3425 // Don't degrade server performance for footprint 3426 if (FLAG_IS_DEFAULT(UseLargePages) && 3427 MaxHeapSize < LargePageHeapSizeThreshold) { 3428 // No need for large granularity pages w/small heaps. 3429 // Note that large pages are enabled/disabled for both the 3430 // Java heap and the code cache. 3431 FLAG_SET_DEFAULT(UseLargePages, false); 3432 } 3433 3434 #else 3435 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3436 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3437 } 3438 #endif 3439 3440 #ifndef TIERED 3441 // Tiered compilation is undefined. 3442 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3443 #endif 3444 3445 // If we are running in a headless jre, force java.awt.headless property 3446 // to be true unless the property has already been set. 3447 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3448 if (os::is_headless_jre()) { 3449 const char* headless = Arguments::get_property("java.awt.headless"); 3450 if (headless == NULL) { 3451 char envbuffer[128]; 3452 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3453 if (!add_property("java.awt.headless=true")) { 3454 return JNI_ENOMEM; 3455 } 3456 } else { 3457 char buffer[256]; 3458 strcpy(buffer, "java.awt.headless="); 3459 strcat(buffer, envbuffer); 3460 if (!add_property(buffer)) { 3461 return JNI_ENOMEM; 3462 } 3463 } 3464 } 3465 } 3466 3467 if (!ArgumentsExt::check_vm_args_consistency()) { 3468 return JNI_ERR; 3469 } 3470 3471 return JNI_OK; 3472 } 3473 3474 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3475 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3476 scp_assembly_required_p); 3477 } 3478 3479 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3480 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3481 scp_assembly_required_p); 3482 } 3483 3484 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3485 const int N_MAX_OPTIONS = 64; 3486 const int OPTION_BUFFER_SIZE = 1024; 3487 char buffer[OPTION_BUFFER_SIZE]; 3488 3489 // The variable will be ignored if it exceeds the length of the buffer. 3490 // Don't check this variable if user has special privileges 3491 // (e.g. unix su command). 3492 if (os::getenv(name, buffer, sizeof(buffer)) && 3493 !os::have_special_privileges()) { 3494 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3495 jio_fprintf(defaultStream::error_stream(), 3496 "Picked up %s: %s\n", name, buffer); 3497 char* rd = buffer; // pointer to the input string (rd) 3498 int i; 3499 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3500 while (isspace(*rd)) rd++; // skip whitespace 3501 if (*rd == 0) break; // we re done when the input string is read completely 3502 3503 // The output, option string, overwrites the input string. 3504 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3505 // input string (rd). 3506 char* wrt = rd; 3507 3508 options[i++].optionString = wrt; // Fill in option 3509 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3510 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3511 int quote = *rd; // matching quote to look for 3512 rd++; // don't copy open quote 3513 while (*rd != quote) { // include everything (even spaces) up until quote 3514 if (*rd == 0) { // string termination means unmatched string 3515 jio_fprintf(defaultStream::error_stream(), 3516 "Unmatched quote in %s\n", name); 3517 return JNI_ERR; 3518 } 3519 *wrt++ = *rd++; // copy to option string 3520 } 3521 rd++; // don't copy close quote 3522 } else { 3523 *wrt++ = *rd++; // copy to option string 3524 } 3525 } 3526 // Need to check if we're done before writing a NULL, 3527 // because the write could be to the byte that rd is pointing to. 3528 if (*rd++ == 0) { 3529 *wrt = 0; 3530 break; 3531 } 3532 *wrt = 0; // Zero terminate option 3533 } 3534 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3535 JavaVMInitArgs vm_args; 3536 vm_args.version = JNI_VERSION_1_2; 3537 vm_args.options = options; 3538 vm_args.nOptions = i; 3539 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3540 3541 if (PrintVMOptions) { 3542 const char* tail; 3543 for (int i = 0; i < vm_args.nOptions; i++) { 3544 const JavaVMOption *option = vm_args.options + i; 3545 if (match_option(option, "-XX:", &tail)) { 3546 logOption(tail); 3547 } 3548 } 3549 } 3550 3551 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3552 } 3553 return JNI_OK; 3554 } 3555 3556 void Arguments::set_shared_spaces_flags() { 3557 if (DumpSharedSpaces) { 3558 if (RequireSharedSpaces) { 3559 warning("cannot dump shared archive while using shared archive"); 3560 } 3561 UseSharedSpaces = false; 3562 #ifdef _LP64 3563 if (!UseCompressedOops || !UseCompressedClassPointers) { 3564 vm_exit_during_initialization( 3565 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3566 } 3567 } else { 3568 if (!UseCompressedOops || !UseCompressedClassPointers) { 3569 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3570 } 3571 #endif 3572 } 3573 } 3574 3575 #if !INCLUDE_ALL_GCS 3576 static void force_serial_gc() { 3577 FLAG_SET_DEFAULT(UseSerialGC, true); 3578 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3579 UNSUPPORTED_GC_OPTION(UseG1GC); 3580 UNSUPPORTED_GC_OPTION(UseParallelGC); 3581 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3582 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3583 UNSUPPORTED_GC_OPTION(UseParNewGC); 3584 } 3585 #endif // INCLUDE_ALL_GCS 3586 3587 // Sharing support 3588 // Construct the path to the archive 3589 static char* get_shared_archive_path() { 3590 char *shared_archive_path; 3591 if (SharedArchiveFile == NULL) { 3592 char jvm_path[JVM_MAXPATHLEN]; 3593 os::jvm_path(jvm_path, sizeof(jvm_path)); 3594 char *end = strrchr(jvm_path, *os::file_separator()); 3595 if (end != NULL) *end = '\0'; 3596 size_t jvm_path_len = strlen(jvm_path); 3597 size_t file_sep_len = strlen(os::file_separator()); 3598 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3599 file_sep_len + 20, mtInternal); 3600 if (shared_archive_path != NULL) { 3601 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3602 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3603 strncat(shared_archive_path, "classes.jsa", 11); 3604 } 3605 } else { 3606 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3607 if (shared_archive_path != NULL) { 3608 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3609 } 3610 } 3611 return shared_archive_path; 3612 } 3613 3614 #ifndef PRODUCT 3615 // Determine whether LogVMOutput should be implicitly turned on. 3616 static bool use_vm_log() { 3617 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3618 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3619 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3620 PrintAssembly || TraceDeoptimization || TraceDependencies || 3621 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3622 return true; 3623 } 3624 3625 #ifdef COMPILER1 3626 if (PrintC1Statistics) { 3627 return true; 3628 } 3629 #endif // COMPILER1 3630 3631 #ifdef COMPILER2 3632 if (PrintOptoAssembly || PrintOptoStatistics) { 3633 return true; 3634 } 3635 #endif // COMPILER2 3636 3637 return false; 3638 } 3639 #endif // PRODUCT 3640 3641 // Parse entry point called from JNI_CreateJavaVM 3642 3643 jint Arguments::parse(const JavaVMInitArgs* args) { 3644 3645 // Remaining part of option string 3646 const char* tail; 3647 3648 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3649 const char* hotspotrc = ".hotspotrc"; 3650 bool settings_file_specified = false; 3651 bool needs_hotspotrc_warning = false; 3652 3653 ArgumentsExt::process_options(args); 3654 3655 const char* flags_file; 3656 int index; 3657 for (index = 0; index < args->nOptions; index++) { 3658 const JavaVMOption *option = args->options + index; 3659 if (match_option(option, "-XX:Flags=", &tail)) { 3660 flags_file = tail; 3661 settings_file_specified = true; 3662 } 3663 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3664 PrintVMOptions = true; 3665 } 3666 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3667 PrintVMOptions = false; 3668 } 3669 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3670 IgnoreUnrecognizedVMOptions = true; 3671 } 3672 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3673 IgnoreUnrecognizedVMOptions = false; 3674 } 3675 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3676 CommandLineFlags::printFlags(tty, false); 3677 vm_exit(0); 3678 } 3679 #if INCLUDE_NMT 3680 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3681 // The launcher did not setup nmt environment variable properly. 3682 if (!MemTracker::check_launcher_nmt_support(tail)) { 3683 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3684 } 3685 3686 // Verify if nmt option is valid. 3687 if (MemTracker::verify_nmt_option()) { 3688 // Late initialization, still in single-threaded mode. 3689 if (MemTracker::tracking_level() >= NMT_summary) { 3690 MemTracker::init(); 3691 } 3692 } else { 3693 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3694 } 3695 } 3696 #endif 3697 3698 3699 #ifndef PRODUCT 3700 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3701 CommandLineFlags::printFlags(tty, true); 3702 vm_exit(0); 3703 } 3704 #endif 3705 } 3706 3707 if (IgnoreUnrecognizedVMOptions) { 3708 // uncast const to modify the flag args->ignoreUnrecognized 3709 *(jboolean*)(&args->ignoreUnrecognized) = true; 3710 } 3711 3712 // Parse specified settings file 3713 if (settings_file_specified) { 3714 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3715 return JNI_EINVAL; 3716 } 3717 } else { 3718 #ifdef ASSERT 3719 // Parse default .hotspotrc settings file 3720 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3721 return JNI_EINVAL; 3722 } 3723 #else 3724 struct stat buf; 3725 if (os::stat(hotspotrc, &buf) == 0) { 3726 needs_hotspotrc_warning = true; 3727 } 3728 #endif 3729 } 3730 3731 if (PrintVMOptions) { 3732 for (index = 0; index < args->nOptions; index++) { 3733 const JavaVMOption *option = args->options + index; 3734 if (match_option(option, "-XX:", &tail)) { 3735 logOption(tail); 3736 } 3737 } 3738 } 3739 3740 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3741 jint result = parse_vm_init_args(args); 3742 if (result != JNI_OK) { 3743 return result; 3744 } 3745 3746 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3747 SharedArchivePath = get_shared_archive_path(); 3748 if (SharedArchivePath == NULL) { 3749 return JNI_ENOMEM; 3750 } 3751 3752 // Set up VerifySharedSpaces 3753 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3754 VerifySharedSpaces = true; 3755 } 3756 3757 // Delay warning until here so that we've had a chance to process 3758 // the -XX:-PrintWarnings flag 3759 if (needs_hotspotrc_warning) { 3760 warning("%s file is present but has been ignored. " 3761 "Run with -XX:Flags=%s to load the file.", 3762 hotspotrc, hotspotrc); 3763 } 3764 3765 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3766 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3767 #endif 3768 3769 #if INCLUDE_ALL_GCS 3770 #if (defined JAVASE_EMBEDDED || defined ARM) 3771 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3772 #endif 3773 #endif 3774 3775 #ifndef PRODUCT 3776 if (TraceBytecodesAt != 0) { 3777 TraceBytecodes = true; 3778 } 3779 if (CountCompiledCalls) { 3780 if (UseCounterDecay) { 3781 warning("UseCounterDecay disabled because CountCalls is set"); 3782 UseCounterDecay = false; 3783 } 3784 } 3785 #endif // PRODUCT 3786 3787 // JSR 292 is not supported before 1.7 3788 if (!JDK_Version::is_gte_jdk17x_version()) { 3789 if (EnableInvokeDynamic) { 3790 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3791 warning("JSR 292 is not supported before 1.7. Disabling support."); 3792 } 3793 EnableInvokeDynamic = false; 3794 } 3795 } 3796 3797 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3798 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3799 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3800 } 3801 ScavengeRootsInCode = 1; 3802 } 3803 3804 if (PrintGCDetails) { 3805 // Turn on -verbose:gc options as well 3806 PrintGC = true; 3807 } 3808 3809 if (!JDK_Version::is_gte_jdk18x_version()) { 3810 // To avoid changing the log format for 7 updates this flag is only 3811 // true by default in JDK8 and above. 3812 if (FLAG_IS_DEFAULT(PrintGCCause)) { 3813 FLAG_SET_DEFAULT(PrintGCCause, false); 3814 } 3815 } 3816 3817 // Set object alignment values. 3818 set_object_alignment(); 3819 3820 #if !INCLUDE_ALL_GCS 3821 force_serial_gc(); 3822 #endif // INCLUDE_ALL_GCS 3823 #if !INCLUDE_CDS 3824 if (DumpSharedSpaces || RequireSharedSpaces) { 3825 jio_fprintf(defaultStream::error_stream(), 3826 "Shared spaces are not supported in this VM\n"); 3827 return JNI_ERR; 3828 } 3829 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3830 warning("Shared spaces are not supported in this VM"); 3831 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3832 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3833 } 3834 no_shared_spaces("CDS Disabled"); 3835 #endif // INCLUDE_CDS 3836 3837 return JNI_OK; 3838 } 3839 3840 jint Arguments::apply_ergo() { 3841 3842 // Set flags based on ergonomics. 3843 set_ergonomics_flags(); 3844 3845 set_shared_spaces_flags(); 3846 3847 // Check the GC selections again. 3848 if (!ArgumentsExt::check_gc_consistency_ergo()) { 3849 return JNI_EINVAL; 3850 } 3851 3852 if (TieredCompilation) { 3853 set_tiered_flags(); 3854 } else { 3855 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3856 if (CompilationPolicyChoice >= 2) { 3857 vm_exit_during_initialization( 3858 "Incompatible compilation policy selected", NULL); 3859 } 3860 } 3861 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 3862 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3863 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 3864 } 3865 3866 3867 // Set heap size based on available physical memory 3868 set_heap_size(); 3869 3870 set_gc_specific_flags(); 3871 3872 // Initialize Metaspace flags and alignments. 3873 Metaspace::ergo_initialize(); 3874 3875 // Set bytecode rewriting flags 3876 set_bytecode_flags(); 3877 3878 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3879 set_aggressive_opts_flags(); 3880 3881 // Turn off biased locking for locking debug mode flags, 3882 // which are subtlely different from each other but neither works with 3883 // biased locking. 3884 if (UseHeavyMonitors 3885 #ifdef COMPILER1 3886 || !UseFastLocking 3887 #endif // COMPILER1 3888 ) { 3889 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3890 // flag set to true on command line; warn the user that they 3891 // can't enable biased locking here 3892 warning("Biased Locking is not supported with locking debug flags" 3893 "; ignoring UseBiasedLocking flag." ); 3894 } 3895 UseBiasedLocking = false; 3896 } 3897 3898 #ifdef ZERO 3899 // Clear flags not supported on zero. 3900 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3901 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3902 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3903 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3904 #endif // CC_INTERP 3905 3906 #ifdef COMPILER2 3907 if (!EliminateLocks) { 3908 EliminateNestedLocks = false; 3909 } 3910 if (!Inline) { 3911 IncrementalInline = false; 3912 } 3913 #ifndef PRODUCT 3914 if (!IncrementalInline) { 3915 AlwaysIncrementalInline = false; 3916 } 3917 #endif 3918 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 3919 // incremental inlining: bump MaxNodeLimit 3920 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 3921 } 3922 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3923 // nothing to use the profiling, turn if off 3924 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3925 } 3926 #endif 3927 3928 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3929 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3930 DebugNonSafepoints = true; 3931 } 3932 3933 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3934 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3935 } 3936 3937 #ifndef PRODUCT 3938 if (CompileTheWorld) { 3939 // Force NmethodSweeper to sweep whole CodeCache each time. 3940 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3941 NmethodSweepFraction = 1; 3942 } 3943 } 3944 3945 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3946 if (use_vm_log()) { 3947 LogVMOutput = true; 3948 } 3949 } 3950 #endif // PRODUCT 3951 3952 if (PrintCommandLineFlags) { 3953 CommandLineFlags::printSetFlags(tty); 3954 } 3955 3956 // Apply CPU specific policy for the BiasedLocking 3957 if (UseBiasedLocking) { 3958 if (!VM_Version::use_biased_locking() && 3959 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3960 UseBiasedLocking = false; 3961 } 3962 } 3963 #ifdef COMPILER2 3964 if (!UseBiasedLocking || EmitSync != 0) { 3965 UseOptoBiasInlining = false; 3966 } 3967 #endif 3968 3969 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3970 // but only if not already set on the commandline 3971 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3972 bool set = false; 3973 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3974 if (!set) { 3975 FLAG_SET_DEFAULT(PauseAtExit, true); 3976 } 3977 } 3978 3979 return JNI_OK; 3980 } 3981 3982 jint Arguments::adjust_after_os() { 3983 if (UseNUMA) { 3984 if (UseParallelGC || UseParallelOldGC) { 3985 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3986 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3987 } 3988 } 3989 // UseNUMAInterleaving is set to ON for all collectors and 3990 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3991 // such as the parallel collector for Linux and Solaris will 3992 // interleave old gen and survivor spaces on top of NUMA 3993 // allocation policy for the eden space. 3994 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3995 // all platforms and ParallelGC on Windows will interleave all 3996 // of the heap spaces across NUMA nodes. 3997 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3998 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3999 } 4000 } 4001 return JNI_OK; 4002 } 4003 4004 int Arguments::PropertyList_count(SystemProperty* pl) { 4005 int count = 0; 4006 while(pl != NULL) { 4007 count++; 4008 pl = pl->next(); 4009 } 4010 return count; 4011 } 4012 4013 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4014 assert(key != NULL, "just checking"); 4015 SystemProperty* prop; 4016 for (prop = pl; prop != NULL; prop = prop->next()) { 4017 if (strcmp(key, prop->key()) == 0) return prop->value(); 4018 } 4019 return NULL; 4020 } 4021 4022 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4023 int count = 0; 4024 const char* ret_val = NULL; 4025 4026 while(pl != NULL) { 4027 if(count >= index) { 4028 ret_val = pl->key(); 4029 break; 4030 } 4031 count++; 4032 pl = pl->next(); 4033 } 4034 4035 return ret_val; 4036 } 4037 4038 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4039 int count = 0; 4040 char* ret_val = NULL; 4041 4042 while(pl != NULL) { 4043 if(count >= index) { 4044 ret_val = pl->value(); 4045 break; 4046 } 4047 count++; 4048 pl = pl->next(); 4049 } 4050 4051 return ret_val; 4052 } 4053 4054 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4055 SystemProperty* p = *plist; 4056 if (p == NULL) { 4057 *plist = new_p; 4058 } else { 4059 while (p->next() != NULL) { 4060 p = p->next(); 4061 } 4062 p->set_next(new_p); 4063 } 4064 } 4065 4066 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4067 if (plist == NULL) 4068 return; 4069 4070 SystemProperty* new_p = new SystemProperty(k, v, true); 4071 PropertyList_add(plist, new_p); 4072 } 4073 4074 // This add maintains unique property key in the list. 4075 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4076 if (plist == NULL) 4077 return; 4078 4079 // If property key exist then update with new value. 4080 SystemProperty* prop; 4081 for (prop = *plist; prop != NULL; prop = prop->next()) { 4082 if (strcmp(k, prop->key()) == 0) { 4083 if (append) { 4084 prop->append_value(v); 4085 } else { 4086 prop->set_value(v); 4087 } 4088 return; 4089 } 4090 } 4091 4092 PropertyList_add(plist, k, v); 4093 } 4094 4095 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4096 // Returns true if all of the source pointed by src has been copied over to 4097 // the destination buffer pointed by buf. Otherwise, returns false. 4098 // Notes: 4099 // 1. If the length (buflen) of the destination buffer excluding the 4100 // NULL terminator character is not long enough for holding the expanded 4101 // pid characters, it also returns false instead of returning the partially 4102 // expanded one. 4103 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4104 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4105 char* buf, size_t buflen) { 4106 const char* p = src; 4107 char* b = buf; 4108 const char* src_end = &src[srclen]; 4109 char* buf_end = &buf[buflen - 1]; 4110 4111 while (p < src_end && b < buf_end) { 4112 if (*p == '%') { 4113 switch (*(++p)) { 4114 case '%': // "%%" ==> "%" 4115 *b++ = *p++; 4116 break; 4117 case 'p': { // "%p" ==> current process id 4118 // buf_end points to the character before the last character so 4119 // that we could write '\0' to the end of the buffer. 4120 size_t buf_sz = buf_end - b + 1; 4121 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4122 4123 // if jio_snprintf fails or the buffer is not long enough to hold 4124 // the expanded pid, returns false. 4125 if (ret < 0 || ret >= (int)buf_sz) { 4126 return false; 4127 } else { 4128 b += ret; 4129 assert(*b == '\0', "fail in copy_expand_pid"); 4130 if (p == src_end && b == buf_end + 1) { 4131 // reach the end of the buffer. 4132 return true; 4133 } 4134 } 4135 p++; 4136 break; 4137 } 4138 default : 4139 *b++ = '%'; 4140 } 4141 } else { 4142 *b++ = *p++; 4143 } 4144 } 4145 *b = '\0'; 4146 return (p == src_end); // return false if not all of the source was copied 4147 }