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