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}, 307 #endif // PRODUCT 308 { NULL, JDK_Version(0), JDK_Version(0) } 309 }; 310 311 // Returns true if the flag is obsolete and fits into the range specified 312 // for being ignored.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