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