1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/symbolTable.hpp" 29 #include "compiler/compilerOracle.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/cardTableRS.hpp" 32 #include "memory/genCollectedHeap.hpp" 33 #include "memory/referenceProcessor.hpp" 34 #include "memory/universe.inline.hpp" 35 #include "oops/oop.inline.hpp" 36 #include "prims/jvmtiExport.hpp" 37 #include "runtime/arguments.hpp" 38 #include "runtime/arguments_ext.hpp" 39 #include "runtime/globals_extension.hpp" 40 #include "runtime/java.hpp" 41 #include "services/management.hpp" 42 #include "services/memTracker.hpp" 43 #include "utilities/defaultStream.hpp" 44 #include "utilities/macros.hpp" 45 #include "utilities/stringUtils.hpp" 46 #include "utilities/taskqueue.hpp" 47 #ifdef TARGET_OS_FAMILY_linux 48 # include "os_linux.inline.hpp" 49 #endif 50 #ifdef TARGET_OS_FAMILY_solaris 51 # include "os_solaris.inline.hpp" 52 #endif 53 #ifdef TARGET_OS_FAMILY_windows 54 # include "os_windows.inline.hpp" 55 #endif 56 #ifdef TARGET_OS_FAMILY_aix 57 # include "os_aix.inline.hpp" 58 #endif 59 #ifdef TARGET_OS_FAMILY_bsd 60 # include "os_bsd.inline.hpp" 61 #endif 62 #if INCLUDE_ALL_GCS 63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 66 #endif // INCLUDE_ALL_GCS 67 68 // Note: This is a special bug reporting site for the JVM 69 #ifdef VENDOR_URL_VM_BUG 70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG 71 #else 72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 73 #endif 74 #define DEFAULT_JAVA_LAUNCHER "generic" 75 76 // Disable options not supported in this release, with a warning if they 77 // were explicitly requested on the command-line 78 #define UNSUPPORTED_OPTION(opt, description) \ 79 do { \ 80 if (opt) { \ 81 if (FLAG_IS_CMDLINE(opt)) { \ 82 warning(description " is disabled in this release."); \ 83 } \ 84 FLAG_SET_DEFAULT(opt, false); \ 85 } \ 86 } while(0) 87 88 #define UNSUPPORTED_GC_OPTION(gc) \ 89 do { \ 90 if (gc) { \ 91 if (FLAG_IS_CMDLINE(gc)) { \ 92 warning(#gc " is not supported in this VM. Using Serial GC."); \ 93 } \ 94 FLAG_SET_DEFAULT(gc, false); \ 95 } \ 96 } while(0) 97 98 char** Arguments::_jvm_flags_array = NULL; 99 int Arguments::_num_jvm_flags = 0; 100 char** Arguments::_jvm_args_array = NULL; 101 int Arguments::_num_jvm_args = 0; 102 char* Arguments::_java_command = NULL; 103 SystemProperty* Arguments::_system_properties = NULL; 104 const char* Arguments::_gc_log_filename = NULL; 105 bool Arguments::_has_profile = false; 106 size_t Arguments::_conservative_max_heap_alignment = 0; 107 uintx Arguments::_min_heap_size = 0; 108 uintx Arguments::_min_heap_free_ratio = 0; 109 uintx Arguments::_max_heap_free_ratio = 0; 110 Arguments::Mode Arguments::_mode = _mixed; 111 bool Arguments::_java_compiler = false; 112 bool Arguments::_xdebug_mode = false; 113 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 114 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 115 int Arguments::_sun_java_launcher_pid = -1; 116 bool Arguments::_created_by_gamma_launcher = false; 117 118 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 119 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 120 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 121 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 122 bool Arguments::_ClipInlining = ClipInlining; 123 124 char* Arguments::SharedArchivePath = NULL; 125 126 AgentLibraryList Arguments::_libraryList; 127 AgentLibraryList Arguments::_agentList; 128 129 abort_hook_t Arguments::_abort_hook = NULL; 130 exit_hook_t Arguments::_exit_hook = NULL; 131 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 132 133 134 SystemProperty *Arguments::_java_ext_dirs = NULL; 135 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 136 SystemProperty *Arguments::_sun_boot_library_path = NULL; 137 SystemProperty *Arguments::_java_library_path = NULL; 138 SystemProperty *Arguments::_java_home = NULL; 139 SystemProperty *Arguments::_java_class_path = NULL; 140 SystemProperty *Arguments::_sun_boot_class_path = NULL; 141 142 char* Arguments::_meta_index_path = NULL; 143 char* Arguments::_meta_index_dir = NULL; 144 145 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 146 147 static bool match_option(const JavaVMOption *option, const char* name, 148 const char** tail) { 149 int len = (int)strlen(name); 150 if (strncmp(option->optionString, name, len) == 0) { 151 *tail = option->optionString + len; 152 return true; 153 } else { 154 return false; 155 } 156 } 157 158 static void logOption(const char* opt) { 159 if (PrintVMOptions) { 160 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 161 } 162 } 163 164 // Process java launcher properties. 165 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 166 // See if sun.java.launcher or sun.java.launcher.pid is defined. 167 // Must do this before setting up other system properties, 168 // as some of them may depend on launcher type. 169 for (int index = 0; index < args->nOptions; index++) { 170 const JavaVMOption* option = args->options + index; 171 const char* tail; 172 173 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 174 process_java_launcher_argument(tail, option->extraInfo); 175 continue; 176 } 177 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 178 _sun_java_launcher_pid = atoi(tail); 179 continue; 180 } 181 } 182 } 183 184 // Initialize system properties key and value. 185 void Arguments::init_system_properties() { 186 187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 188 "Java Virtual Machine Specification", false)); 189 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 190 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 191 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 192 193 // following are JVMTI agent writeable properties. 194 // Properties values are set to NULL and they are 195 // os specific they are initialized in os::init_system_properties_values(). 196 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 197 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 198 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 199 _java_library_path = new SystemProperty("java.library.path", NULL, true); 200 _java_home = new SystemProperty("java.home", NULL, true); 201 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 202 203 _java_class_path = new SystemProperty("java.class.path", "", true); 204 205 // Add to System Property list. 206 PropertyList_add(&_system_properties, _java_ext_dirs); 207 PropertyList_add(&_system_properties, _java_endorsed_dirs); 208 PropertyList_add(&_system_properties, _sun_boot_library_path); 209 PropertyList_add(&_system_properties, _java_library_path); 210 PropertyList_add(&_system_properties, _java_home); 211 PropertyList_add(&_system_properties, _java_class_path); 212 PropertyList_add(&_system_properties, _sun_boot_class_path); 213 214 // Set OS specific system properties values 215 os::init_system_properties_values(); 216 } 217 218 219 // Update/Initialize System properties after JDK version number is known 220 void Arguments::init_version_specific_system_properties() { 221 enum { bufsz = 16 }; 222 char buffer[bufsz]; 223 const char* spec_vendor = "Sun Microsystems Inc."; 224 uint32_t spec_version = 0; 225 226 if (JDK_Version::is_gte_jdk17x_version()) { 227 spec_vendor = "Oracle Corporation"; 228 spec_version = JDK_Version::current().major_version(); 229 } 230 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 231 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 234 PropertyList_add(&_system_properties, 235 new SystemProperty("java.vm.specification.version", buffer, false)); 236 PropertyList_add(&_system_properties, 237 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 238 } 239 240 /** 241 * Provide a slightly more user-friendly way of eliminating -XX flags. 242 * When a flag is eliminated, it can be added to this list in order to 243 * continue accepting this flag on the command-line, while issuing a warning 244 * and ignoring the value. Once the JDK version reaches the 'accept_until' 245 * limit, we flatly refuse to admit the existence of the flag. This allows 246 * a flag to die correctly over JDK releases using HSX. 247 */ 248 typedef struct { 249 const char* name; 250 JDK_Version obsoleted_in; // when the flag went away 251 JDK_Version accept_until; // which version to start denying the existence 252 } ObsoleteFlag; 253 254 static ObsoleteFlag obsolete_jvm_flags[] = { 255 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 260 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 261 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 262 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 263 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 264 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 265 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 266 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 267 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 268 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 269 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 270 { "DefaultInitialRAMFraction", 271 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 272 { "UseDepthFirstScavengeOrder", 273 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 274 { "HandlePromotionFailure", 275 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 276 { "MaxLiveObjectEvacuationRatio", 277 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 278 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 279 { "UseParallelOldGCCompacting", 280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 281 { "UseParallelDensePrefixUpdate", 282 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 283 { "UseParallelOldGCDensePrefix", 284 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 285 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 286 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 287 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 297 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 302 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 303 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 304 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 305 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 306 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 307 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 308 { "SegmentedHeapDumpThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 309 #ifdef PRODUCT 310 { "DesiredMethodLimit", 311 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 312 #endif // PRODUCT 313 { NULL, JDK_Version(0), JDK_Version(0) } 314 }; 315 316 // Returns true if the flag is obsolete and fits into the range specified 317 // for being ignored. In the case that the flag is ignored, the 'version' 318 // value is filled in with the version number when the flag became 319 // obsolete so that that value can be displayed to the user. 320 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 321 int i = 0; 322 assert(version != NULL, "Must provide a version buffer"); 323 while (obsolete_jvm_flags[i].name != NULL) { 324 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 325 // <flag>=xxx form 326 // [-|+]<flag> form 327 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 328 ((s[0] == '+' || s[0] == '-') && 329 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 330 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 331 *version = flag_status.obsoleted_in; 332 return true; 333 } 334 } 335 i++; 336 } 337 return false; 338 } 339 340 // Constructs the system class path (aka boot class path) from the following 341 // components, in order: 342 // 343 // prefix // from -Xbootclasspath/p:... 344 // endorsed // the expansion of -Djava.endorsed.dirs=... 345 // base // from os::get_system_properties() or -Xbootclasspath= 346 // suffix // from -Xbootclasspath/a:... 347 // 348 // java.endorsed.dirs is a list of directories; any jar or zip files in the 349 // directories are added to the sysclasspath just before the base. 350 // 351 // This could be AllStatic, but it isn't needed after argument processing is 352 // complete. 353 class SysClassPath: public StackObj { 354 public: 355 SysClassPath(const char* base); 356 ~SysClassPath(); 357 358 inline void set_base(const char* base); 359 inline void add_prefix(const char* prefix); 360 inline void add_suffix_to_prefix(const char* suffix); 361 inline void add_suffix(const char* suffix); 362 inline void reset_path(const char* base); 363 364 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 365 // property. Must be called after all command-line arguments have been 366 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 367 // combined_path(). 368 void expand_endorsed(); 369 370 inline const char* get_base() const { return _items[_scp_base]; } 371 inline const char* get_prefix() const { return _items[_scp_prefix]; } 372 inline const char* get_suffix() const { return _items[_scp_suffix]; } 373 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 374 375 // Combine all the components into a single c-heap-allocated string; caller 376 // must free the string if/when no longer needed. 377 char* combined_path(); 378 379 private: 380 // Utility routines. 381 static char* add_to_path(const char* path, const char* str, bool prepend); 382 static char* add_jars_to_path(char* path, const char* directory); 383 384 inline void reset_item_at(int index); 385 386 // Array indices for the items that make up the sysclasspath. All except the 387 // base are allocated in the C heap and freed by this class. 388 enum { 389 _scp_prefix, // from -Xbootclasspath/p:... 390 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 391 _scp_base, // the default sysclasspath 392 _scp_suffix, // from -Xbootclasspath/a:... 393 _scp_nitems // the number of items, must be last. 394 }; 395 396 const char* _items[_scp_nitems]; 397 DEBUG_ONLY(bool _expansion_done;) 398 }; 399 400 SysClassPath::SysClassPath(const char* base) { 401 memset(_items, 0, sizeof(_items)); 402 _items[_scp_base] = base; 403 DEBUG_ONLY(_expansion_done = false;) 404 } 405 406 SysClassPath::~SysClassPath() { 407 // Free everything except the base. 408 for (int i = 0; i < _scp_nitems; ++i) { 409 if (i != _scp_base) reset_item_at(i); 410 } 411 DEBUG_ONLY(_expansion_done = false;) 412 } 413 414 inline void SysClassPath::set_base(const char* base) { 415 _items[_scp_base] = base; 416 } 417 418 inline void SysClassPath::add_prefix(const char* prefix) { 419 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 420 } 421 422 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 423 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 424 } 425 426 inline void SysClassPath::add_suffix(const char* suffix) { 427 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 428 } 429 430 inline void SysClassPath::reset_item_at(int index) { 431 assert(index < _scp_nitems && index != _scp_base, "just checking"); 432 if (_items[index] != NULL) { 433 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 434 _items[index] = NULL; 435 } 436 } 437 438 inline void SysClassPath::reset_path(const char* base) { 439 // Clear the prefix and suffix. 440 reset_item_at(_scp_prefix); 441 reset_item_at(_scp_suffix); 442 set_base(base); 443 } 444 445 //------------------------------------------------------------------------------ 446 447 void SysClassPath::expand_endorsed() { 448 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 449 450 const char* path = Arguments::get_property("java.endorsed.dirs"); 451 if (path == NULL) { 452 path = Arguments::get_endorsed_dir(); 453 assert(path != NULL, "no default for java.endorsed.dirs"); 454 } 455 456 char* expanded_path = NULL; 457 const char separator = *os::path_separator(); 458 const char* const end = path + strlen(path); 459 while (path < end) { 460 const char* tmp_end = strchr(path, separator); 461 if (tmp_end == NULL) { 462 expanded_path = add_jars_to_path(expanded_path, path); 463 path = end; 464 } else { 465 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 466 memcpy(dirpath, path, tmp_end - path); 467 dirpath[tmp_end - path] = '\0'; 468 expanded_path = add_jars_to_path(expanded_path, dirpath); 469 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 470 path = tmp_end + 1; 471 } 472 } 473 _items[_scp_endorsed] = expanded_path; 474 DEBUG_ONLY(_expansion_done = true;) 475 } 476 477 // Combine the bootclasspath elements, some of which may be null, into a single 478 // c-heap-allocated string. 479 char* SysClassPath::combined_path() { 480 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 481 assert(_expansion_done, "must call expand_endorsed() first."); 482 483 size_t lengths[_scp_nitems]; 484 size_t total_len = 0; 485 486 const char separator = *os::path_separator(); 487 488 // Get the lengths. 489 int i; 490 for (i = 0; i < _scp_nitems; ++i) { 491 if (_items[i] != NULL) { 492 lengths[i] = strlen(_items[i]); 493 // Include space for the separator char (or a NULL for the last item). 494 total_len += lengths[i] + 1; 495 } 496 } 497 assert(total_len > 0, "empty sysclasspath not allowed"); 498 499 // Copy the _items to a single string. 500 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 501 char* cp_tmp = cp; 502 for (i = 0; i < _scp_nitems; ++i) { 503 if (_items[i] != NULL) { 504 memcpy(cp_tmp, _items[i], lengths[i]); 505 cp_tmp += lengths[i]; 506 *cp_tmp++ = separator; 507 } 508 } 509 *--cp_tmp = '\0'; // Replace the extra separator. 510 return cp; 511 } 512 513 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 514 char* 515 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 516 char *cp; 517 518 assert(str != NULL, "just checking"); 519 if (path == NULL) { 520 size_t len = strlen(str) + 1; 521 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 522 memcpy(cp, str, len); // copy the trailing null 523 } else { 524 const char separator = *os::path_separator(); 525 size_t old_len = strlen(path); 526 size_t str_len = strlen(str); 527 size_t len = old_len + str_len + 2; 528 529 if (prepend) { 530 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 531 char* cp_tmp = cp; 532 memcpy(cp_tmp, str, str_len); 533 cp_tmp += str_len; 534 *cp_tmp = separator; 535 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 536 FREE_C_HEAP_ARRAY(char, path, mtInternal); 537 } else { 538 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 539 char* cp_tmp = cp + old_len; 540 *cp_tmp = separator; 541 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 542 } 543 } 544 return cp; 545 } 546 547 // Scan the directory and append any jar or zip files found to path. 548 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 549 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 550 DIR* dir = os::opendir(directory); 551 if (dir == NULL) return path; 552 553 char dir_sep[2] = { '\0', '\0' }; 554 size_t directory_len = strlen(directory); 555 const char fileSep = *os::file_separator(); 556 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 557 558 /* Scan the directory for jars/zips, appending them to path. */ 559 struct dirent *entry; 560 while ((entry = os::readdir(dir)) != NULL) { 561 const char* name = entry->d_name; 562 const char* ext = name + strlen(name) - 4; 563 bool isJarOrZip = ext > name && 564 (os::file_name_strcmp(ext, ".jar") == 0 || 565 os::file_name_strcmp(ext, ".zip") == 0); 566 if (isJarOrZip) { 567 size_t length = directory_len + 2 + strlen(name); 568 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal); 569 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name); 570 path = add_to_path(path, jarpath, false); 571 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 572 } 573 } 574 os::closedir(dir); 575 return path; 576 } 577 578 // Parses a memory size specification string. 579 static bool atomull(const char *s, julong* result) { 580 julong n = 0; 581 int args_read = sscanf(s, JULONG_FORMAT, &n); 582 if (args_read != 1) { 583 return false; 584 } 585 while (*s != '\0' && isdigit(*s)) { 586 s++; 587 } 588 // 4705540: illegal if more characters are found after the first non-digit 589 if (strlen(s) > 1) { 590 return false; 591 } 592 switch (*s) { 593 case 'T': case 't': 594 *result = n * G * K; 595 // Check for overflow. 596 if (*result/((julong)G * K) != n) return false; 597 return true; 598 case 'G': case 'g': 599 *result = n * G; 600 if (*result/G != n) return false; 601 return true; 602 case 'M': case 'm': 603 *result = n * M; 604 if (*result/M != n) return false; 605 return true; 606 case 'K': case 'k': 607 *result = n * K; 608 if (*result/K != n) return false; 609 return true; 610 case '\0': 611 *result = n; 612 return true; 613 default: 614 return false; 615 } 616 } 617 618 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 619 if (size < min_size) return arg_too_small; 620 // Check that size will fit in a size_t (only relevant on 32-bit) 621 if (size > max_uintx) return arg_too_big; 622 return arg_in_range; 623 } 624 625 // Describe an argument out of range error 626 void Arguments::describe_range_error(ArgsRange errcode) { 627 switch(errcode) { 628 case arg_too_big: 629 jio_fprintf(defaultStream::error_stream(), 630 "The specified size exceeds the maximum " 631 "representable size.\n"); 632 break; 633 case arg_too_small: 634 case arg_unreadable: 635 case arg_in_range: 636 // do nothing for now 637 break; 638 default: 639 ShouldNotReachHere(); 640 } 641 } 642 643 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 644 return CommandLineFlags::boolAtPut(name, &value, origin); 645 } 646 647 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 648 double v; 649 if (sscanf(value, "%lf", &v) != 1) { 650 return false; 651 } 652 653 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 654 return true; 655 } 656 return false; 657 } 658 659 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 660 julong v; 661 intx intx_v; 662 bool is_neg = false; 663 // Check the sign first since atomull() parses only unsigned values. 664 if (*value == '-') { 665 if (!CommandLineFlags::intxAt(name, &intx_v)) { 666 return false; 667 } 668 value++; 669 is_neg = true; 670 } 671 if (!atomull(value, &v)) { 672 return false; 673 } 674 intx_v = (intx) v; 675 if (is_neg) { 676 intx_v = -intx_v; 677 } 678 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 679 return true; 680 } 681 uintx uintx_v = (uintx) v; 682 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 683 return true; 684 } 685 uint64_t uint64_t_v = (uint64_t) v; 686 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 687 return true; 688 } 689 return false; 690 } 691 692 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 693 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 694 // Contract: CommandLineFlags always returns a pointer that needs freeing. 695 FREE_C_HEAP_ARRAY(char, value, mtInternal); 696 return true; 697 } 698 699 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 700 const char* old_value = ""; 701 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 702 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 703 size_t new_len = strlen(new_value); 704 const char* value; 705 char* free_this_too = NULL; 706 if (old_len == 0) { 707 value = new_value; 708 } else if (new_len == 0) { 709 value = old_value; 710 } else { 711 size_t length = old_len + 1 + new_len + 1; 712 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal); 713 // each new setting adds another LINE to the switch: 714 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 715 value = buf; 716 free_this_too = buf; 717 } 718 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 719 // CommandLineFlags always returns a pointer that needs freeing. 720 FREE_C_HEAP_ARRAY(char, value, mtInternal); 721 if (free_this_too != NULL) { 722 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 723 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 724 } 725 return true; 726 } 727 728 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 729 730 // range of acceptable characters spelled out for portability reasons 731 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 732 #define BUFLEN 255 733 char name[BUFLEN+1]; 734 char dummy; 735 736 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 737 return set_bool_flag(name, false, origin); 738 } 739 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 740 return set_bool_flag(name, true, origin); 741 } 742 743 char punct; 744 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 745 const char* value = strchr(arg, '=') + 1; 746 Flag* flag = Flag::find_flag(name, strlen(name)); 747 if (flag != NULL && flag->is_ccstr()) { 748 if (flag->ccstr_accumulates()) { 749 return append_to_string_flag(name, value, origin); 750 } else { 751 if (value[0] == '\0') { 752 value = NULL; 753 } 754 return set_string_flag(name, value, origin); 755 } 756 } 757 } 758 759 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 760 const char* value = strchr(arg, '=') + 1; 761 // -XX:Foo:=xxx will reset the string flag to the given value. 762 if (value[0] == '\0') { 763 value = NULL; 764 } 765 return set_string_flag(name, value, origin); 766 } 767 768 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 769 #define SIGNED_NUMBER_RANGE "[-0123456789]" 770 #define NUMBER_RANGE "[0123456789]" 771 char value[BUFLEN + 1]; 772 char value2[BUFLEN + 1]; 773 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 774 // Looks like a floating-point number -- try again with more lenient format string 775 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 776 return set_fp_numeric_flag(name, value, origin); 777 } 778 } 779 780 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 781 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 782 return set_numeric_flag(name, value, origin); 783 } 784 785 return false; 786 } 787 788 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 789 assert(bldarray != NULL, "illegal argument"); 790 791 if (arg == NULL) { 792 return; 793 } 794 795 int new_count = *count + 1; 796 797 // expand the array and add arg to the last element 798 if (*bldarray == NULL) { 799 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 800 } else { 801 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 802 } 803 (*bldarray)[*count] = strdup(arg); 804 *count = new_count; 805 } 806 807 void Arguments::build_jvm_args(const char* arg) { 808 add_string(&_jvm_args_array, &_num_jvm_args, arg); 809 } 810 811 void Arguments::build_jvm_flags(const char* arg) { 812 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 813 } 814 815 // utility function to return a string that concatenates all 816 // strings in a given char** array 817 const char* Arguments::build_resource_string(char** args, int count) { 818 if (args == NULL || count == 0) { 819 return NULL; 820 } 821 size_t length = 0; 822 for (int i = 0; i < count; i++) { 823 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 824 } 825 char* s = NEW_RESOURCE_ARRAY(char, length); 826 char* dst = s; 827 for (int j = 0; j < count; j++) { 828 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 829 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 830 dst += offset; 831 length -= offset; 832 } 833 return (const char*) s; 834 } 835 836 void Arguments::print_on(outputStream* st) { 837 st->print_cr("VM Arguments:"); 838 if (num_jvm_flags() > 0) { 839 st->print("jvm_flags: "); print_jvm_flags_on(st); 840 } 841 if (num_jvm_args() > 0) { 842 st->print("jvm_args: "); print_jvm_args_on(st); 843 } 844 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 845 if (_java_class_path != NULL) { 846 char* path = _java_class_path->value(); 847 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 848 } 849 st->print_cr("Launcher Type: %s", _sun_java_launcher); 850 } 851 852 void Arguments::print_jvm_flags_on(outputStream* st) { 853 if (_num_jvm_flags > 0) { 854 for (int i=0; i < _num_jvm_flags; i++) { 855 st->print("%s ", _jvm_flags_array[i]); 856 } 857 st->cr(); 858 } 859 } 860 861 void Arguments::print_jvm_args_on(outputStream* st) { 862 if (_num_jvm_args > 0) { 863 for (int i=0; i < _num_jvm_args; i++) { 864 st->print("%s ", _jvm_args_array[i]); 865 } 866 st->cr(); 867 } 868 } 869 870 bool Arguments::process_argument(const char* arg, 871 jboolean ignore_unrecognized, Flag::Flags origin) { 872 873 JDK_Version since = JDK_Version(); 874 875 if (parse_argument(arg, origin) || ignore_unrecognized) { 876 return true; 877 } 878 879 bool has_plus_minus = (*arg == '+' || *arg == '-'); 880 const char* const argname = has_plus_minus ? arg + 1 : arg; 881 if (is_newly_obsolete(arg, &since)) { 882 char version[256]; 883 since.to_string(version, sizeof(version)); 884 warning("ignoring option %s; support was removed in %s", argname, version); 885 return true; 886 } 887 888 // For locked flags, report a custom error message if available. 889 // Otherwise, report the standard unrecognized VM option. 890 891 size_t arg_len; 892 const char* equal_sign = strchr(argname, '='); 893 if (equal_sign == NULL) { 894 arg_len = strlen(argname); 895 } else { 896 arg_len = equal_sign - argname; 897 } 898 899 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 900 if (found_flag != NULL) { 901 char locked_message_buf[BUFLEN]; 902 found_flag->get_locked_message(locked_message_buf, BUFLEN); 903 if (strlen(locked_message_buf) == 0) { 904 if (found_flag->is_bool() && !has_plus_minus) { 905 jio_fprintf(defaultStream::error_stream(), 906 "Missing +/- setting for VM option '%s'\n", argname); 907 } else if (!found_flag->is_bool() && has_plus_minus) { 908 jio_fprintf(defaultStream::error_stream(), 909 "Unexpected +/- setting in VM option '%s'\n", argname); 910 } else { 911 jio_fprintf(defaultStream::error_stream(), 912 "Improperly specified VM option '%s'\n", argname); 913 } 914 } else { 915 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 916 } 917 } else { 918 jio_fprintf(defaultStream::error_stream(), 919 "Unrecognized VM option '%s'\n", argname); 920 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 921 if (fuzzy_matched != NULL) { 922 jio_fprintf(defaultStream::error_stream(), 923 "Did you mean '%s%s%s'?\n", 924 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 925 fuzzy_matched->_name, 926 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 927 } 928 } 929 930 // allow for commandline "commenting out" options like -XX:#+Verbose 931 return arg[0] == '#'; 932 } 933 934 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 935 FILE* stream = fopen(file_name, "rb"); 936 if (stream == NULL) { 937 if (should_exist) { 938 jio_fprintf(defaultStream::error_stream(), 939 "Could not open settings file %s\n", file_name); 940 return false; 941 } else { 942 return true; 943 } 944 } 945 946 char token[1024]; 947 int pos = 0; 948 949 bool in_white_space = true; 950 bool in_comment = false; 951 bool in_quote = false; 952 char quote_c = 0; 953 bool result = true; 954 955 int c = getc(stream); 956 while(c != EOF && pos < (int)(sizeof(token)-1)) { 957 if (in_white_space) { 958 if (in_comment) { 959 if (c == '\n') in_comment = false; 960 } else { 961 if (c == '#') in_comment = true; 962 else if (!isspace(c)) { 963 in_white_space = false; 964 token[pos++] = c; 965 } 966 } 967 } else { 968 if (c == '\n' || (!in_quote && isspace(c))) { 969 // token ends at newline, or at unquoted whitespace 970 // this allows a way to include spaces in string-valued options 971 token[pos] = '\0'; 972 logOption(token); 973 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 974 build_jvm_flags(token); 975 pos = 0; 976 in_white_space = true; 977 in_quote = false; 978 } else if (!in_quote && (c == '\'' || c == '"')) { 979 in_quote = true; 980 quote_c = c; 981 } else if (in_quote && (c == quote_c)) { 982 in_quote = false; 983 } else { 984 token[pos++] = c; 985 } 986 } 987 c = getc(stream); 988 } 989 if (pos > 0) { 990 token[pos] = '\0'; 991 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 992 build_jvm_flags(token); 993 } 994 fclose(stream); 995 return result; 996 } 997 998 //============================================================================================================= 999 // Parsing of properties (-D) 1000 1001 const char* Arguments::get_property(const char* key) { 1002 return PropertyList_get_value(system_properties(), key); 1003 } 1004 1005 bool Arguments::add_property(const char* prop) { 1006 const char* eq = strchr(prop, '='); 1007 char* key; 1008 // ns must be static--its address may be stored in a SystemProperty object. 1009 const static char ns[1] = {0}; 1010 char* value = (char *)ns; 1011 1012 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1013 key = AllocateHeap(key_len + 1, mtInternal); 1014 strncpy(key, prop, key_len); 1015 key[key_len] = '\0'; 1016 1017 if (eq != NULL) { 1018 size_t value_len = strlen(prop) - key_len - 1; 1019 value = AllocateHeap(value_len + 1, mtInternal); 1020 strncpy(value, &prop[key_len + 1], value_len + 1); 1021 } 1022 1023 if (strcmp(key, "java.compiler") == 0) { 1024 process_java_compiler_argument(value); 1025 FreeHeap(key); 1026 if (eq != NULL) { 1027 FreeHeap(value); 1028 } 1029 return true; 1030 } else if (strcmp(key, "sun.java.command") == 0) { 1031 _java_command = value; 1032 1033 // Record value in Arguments, but let it get passed to Java. 1034 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 1035 // launcher.pid property is private and is processed 1036 // in process_sun_java_launcher_properties(); 1037 // the sun.java.launcher property is passed on to the java application 1038 FreeHeap(key); 1039 if (eq != NULL) { 1040 FreeHeap(value); 1041 } 1042 return true; 1043 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1044 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1045 // its value without going through the property list or making a Java call. 1046 _java_vendor_url_bug = value; 1047 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1048 PropertyList_unique_add(&_system_properties, key, value, true); 1049 return true; 1050 } 1051 // Create new property and add at the end of the list 1052 PropertyList_unique_add(&_system_properties, key, value); 1053 return true; 1054 } 1055 1056 //=========================================================================================================== 1057 // Setting int/mixed/comp mode flags 1058 1059 void Arguments::set_mode_flags(Mode mode) { 1060 // Set up default values for all flags. 1061 // If you add a flag to any of the branches below, 1062 // add a default value for it here. 1063 set_java_compiler(false); 1064 _mode = mode; 1065 1066 // Ensure Agent_OnLoad has the correct initial values. 1067 // This may not be the final mode; mode may change later in onload phase. 1068 PropertyList_unique_add(&_system_properties, "java.vm.info", 1069 (char*)VM_Version::vm_info_string(), false); 1070 1071 UseInterpreter = true; 1072 UseCompiler = true; 1073 UseLoopCounter = true; 1074 1075 #ifndef ZERO 1076 // Turn these off for mixed and comp. Leave them on for Zero. 1077 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1078 UseFastAccessorMethods = (mode == _int); 1079 } 1080 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1081 UseFastEmptyMethods = (mode == _int); 1082 } 1083 #endif 1084 1085 // Default values may be platform/compiler dependent - 1086 // use the saved values 1087 ClipInlining = Arguments::_ClipInlining; 1088 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1089 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1090 BackgroundCompilation = Arguments::_BackgroundCompilation; 1091 1092 // Change from defaults based on mode 1093 switch (mode) { 1094 default: 1095 ShouldNotReachHere(); 1096 break; 1097 case _int: 1098 UseCompiler = false; 1099 UseLoopCounter = false; 1100 AlwaysCompileLoopMethods = false; 1101 UseOnStackReplacement = false; 1102 break; 1103 case _mixed: 1104 // same as default 1105 break; 1106 case _comp: 1107 UseInterpreter = false; 1108 BackgroundCompilation = false; 1109 ClipInlining = false; 1110 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1111 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1112 // compile a level 4 (C2) and then continue executing it. 1113 if (TieredCompilation) { 1114 Tier3InvokeNotifyFreqLog = 0; 1115 Tier4InvocationThreshold = 0; 1116 } 1117 break; 1118 } 1119 } 1120 1121 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1122 // Conflict: required to use shared spaces (-Xshare:on), but 1123 // incompatible command line options were chosen. 1124 1125 static void no_shared_spaces(const char* message) { 1126 if (RequireSharedSpaces) { 1127 jio_fprintf(defaultStream::error_stream(), 1128 "Class data sharing is inconsistent with other specified options.\n"); 1129 vm_exit_during_initialization("Unable to use shared archive.", message); 1130 } else { 1131 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1132 } 1133 } 1134 #endif 1135 1136 void Arguments::set_tiered_flags() { 1137 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1138 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1139 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1140 } 1141 if (CompilationPolicyChoice < 2) { 1142 vm_exit_during_initialization( 1143 "Incompatible compilation policy selected", NULL); 1144 } 1145 // Increase the code cache size - tiered compiles a lot more. 1146 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1147 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1148 } 1149 if (!UseInterpreter) { // -Xcomp 1150 Tier3InvokeNotifyFreqLog = 0; 1151 Tier4InvocationThreshold = 0; 1152 } 1153 } 1154 1155 /** 1156 * Returns the minimum number of compiler threads needed to run the JVM. The following 1157 * configurations are possible. 1158 * 1159 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1160 * compiler threads is 0. 1161 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1162 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1163 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1164 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1165 * C1 can be used, so the minimum number of compiler threads is 1. 1166 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1167 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1168 * the minimum number of compiler threads is 2. 1169 */ 1170 int Arguments::get_min_number_of_compiler_threads() { 1171 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1172 return 0; // case 1 1173 #else 1174 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1175 return 1; // case 2 or case 3 1176 } 1177 return 2; // case 4 (tiered) 1178 #endif 1179 } 1180 1181 #if INCLUDE_ALL_GCS 1182 static void disable_adaptive_size_policy(const char* collector_name) { 1183 if (UseAdaptiveSizePolicy) { 1184 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1185 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1186 collector_name); 1187 } 1188 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1189 } 1190 } 1191 1192 void Arguments::set_parnew_gc_flags() { 1193 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1194 "control point invariant"); 1195 assert(UseParNewGC, "Error"); 1196 1197 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1198 disable_adaptive_size_policy("UseParNewGC"); 1199 1200 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1201 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1202 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1203 } else if (ParallelGCThreads == 0) { 1204 jio_fprintf(defaultStream::error_stream(), 1205 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1206 vm_exit(1); 1207 } 1208 1209 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1210 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1211 // we set them to 1024 and 1024. 1212 // See CR 6362902. 1213 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1214 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1215 } 1216 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1217 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1218 } 1219 1220 // AlwaysTenure flag should make ParNew promote all at first collection. 1221 // See CR 6362902. 1222 if (AlwaysTenure) { 1223 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1224 } 1225 // When using compressed oops, we use local overflow stacks, 1226 // rather than using a global overflow list chained through 1227 // the klass word of the object's pre-image. 1228 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1229 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1230 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1231 } 1232 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1233 } 1234 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1235 } 1236 1237 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1238 // sparc/solaris for certain applications, but would gain from 1239 // further optimization and tuning efforts, and would almost 1240 // certainly gain from analysis of platform and environment. 1241 void Arguments::set_cms_and_parnew_gc_flags() { 1242 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1243 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1244 1245 // If we are using CMS, we prefer to UseParNewGC, 1246 // unless explicitly forbidden. 1247 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1248 FLAG_SET_ERGO(bool, UseParNewGC, true); 1249 } 1250 1251 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1252 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1253 1254 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1255 // as needed. 1256 if (UseParNewGC) { 1257 set_parnew_gc_flags(); 1258 } 1259 1260 size_t max_heap = align_size_down(MaxHeapSize, 1261 CardTableRS::ct_max_alignment_constraint()); 1262 1263 // Now make adjustments for CMS 1264 intx tenuring_default = (intx)6; 1265 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1266 1267 // Preferred young gen size for "short" pauses: 1268 // upper bound depends on # of threads and NewRatio. 1269 const uintx parallel_gc_threads = 1270 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1271 const size_t preferred_max_new_size_unaligned = 1272 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1273 size_t preferred_max_new_size = 1274 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1275 1276 // Unless explicitly requested otherwise, size young gen 1277 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1278 1279 // If either MaxNewSize or NewRatio is set on the command line, 1280 // assume the user is trying to set the size of the young gen. 1281 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1282 1283 // Set MaxNewSize to our calculated preferred_max_new_size unless 1284 // NewSize was set on the command line and it is larger than 1285 // preferred_max_new_size. 1286 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1287 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1288 } else { 1289 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1290 } 1291 if (PrintGCDetails && Verbose) { 1292 // Too early to use gclog_or_tty 1293 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1294 } 1295 1296 // Code along this path potentially sets NewSize and OldSize 1297 if (PrintGCDetails && Verbose) { 1298 // Too early to use gclog_or_tty 1299 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1300 " initial_heap_size: " SIZE_FORMAT 1301 " max_heap: " SIZE_FORMAT, 1302 min_heap_size(), InitialHeapSize, max_heap); 1303 } 1304 size_t min_new = preferred_max_new_size; 1305 if (FLAG_IS_CMDLINE(NewSize)) { 1306 min_new = NewSize; 1307 } 1308 if (max_heap > min_new && min_heap_size() > min_new) { 1309 // Unless explicitly requested otherwise, make young gen 1310 // at least min_new, and at most preferred_max_new_size. 1311 if (FLAG_IS_DEFAULT(NewSize)) { 1312 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1313 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1314 if (PrintGCDetails && Verbose) { 1315 // Too early to use gclog_or_tty 1316 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1317 } 1318 } 1319 // Unless explicitly requested otherwise, size old gen 1320 // so it's NewRatio x of NewSize. 1321 if (FLAG_IS_DEFAULT(OldSize)) { 1322 if (max_heap > NewSize) { 1323 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1324 if (PrintGCDetails && Verbose) { 1325 // Too early to use gclog_or_tty 1326 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1327 } 1328 } 1329 } 1330 } 1331 } 1332 // Unless explicitly requested otherwise, definitely 1333 // promote all objects surviving "tenuring_default" scavenges. 1334 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1335 FLAG_IS_DEFAULT(SurvivorRatio)) { 1336 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1337 } 1338 // If we decided above (or user explicitly requested) 1339 // `promote all' (via MaxTenuringThreshold := 0), 1340 // prefer minuscule survivor spaces so as not to waste 1341 // space for (non-existent) survivors 1342 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1343 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1344 } 1345 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1346 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1347 // This is done in order to make ParNew+CMS configuration to work 1348 // with YoungPLABSize and OldPLABSize options. 1349 // See CR 6362902. 1350 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1351 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1352 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1353 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1354 // the value (either from the command line or ergonomics) of 1355 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1356 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1357 } else { 1358 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1359 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1360 // we'll let it to take precedence. 1361 jio_fprintf(defaultStream::error_stream(), 1362 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1363 " options are specified for the CMS collector." 1364 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1365 } 1366 } 1367 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1368 // OldPLAB sizing manually turned off: Use a larger default setting, 1369 // unless it was manually specified. This is because a too-low value 1370 // will slow down scavenges. 1371 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1372 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1373 } 1374 } 1375 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1376 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1377 // If either of the static initialization defaults have changed, note this 1378 // modification. 1379 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1380 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1381 } 1382 1383 if (PrintGCDetails && Verbose) { 1384 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1385 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1386 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1387 } 1388 } 1389 #endif // INCLUDE_ALL_GCS 1390 1391 void set_object_alignment() { 1392 // Object alignment. 1393 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1394 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1395 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1396 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1397 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1398 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1399 1400 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1401 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1402 1403 // Oop encoding heap max 1404 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1405 1406 #if INCLUDE_ALL_GCS 1407 // Set CMS global values 1408 CompactibleFreeListSpace::set_cms_values(); 1409 #endif // INCLUDE_ALL_GCS 1410 } 1411 1412 bool verify_object_alignment() { 1413 // Object alignment. 1414 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1415 jio_fprintf(defaultStream::error_stream(), 1416 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1417 (int)ObjectAlignmentInBytes); 1418 return false; 1419 } 1420 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1421 jio_fprintf(defaultStream::error_stream(), 1422 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1423 (int)ObjectAlignmentInBytes, BytesPerLong); 1424 return false; 1425 } 1426 // It does not make sense to have big object alignment 1427 // since a space lost due to alignment will be greater 1428 // then a saved space from compressed oops. 1429 if ((int)ObjectAlignmentInBytes > 256) { 1430 jio_fprintf(defaultStream::error_stream(), 1431 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1432 (int)ObjectAlignmentInBytes); 1433 return false; 1434 } 1435 // In case page size is very small. 1436 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1437 jio_fprintf(defaultStream::error_stream(), 1438 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1439 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1440 return false; 1441 } 1442 if(SurvivorAlignmentInBytes == 0) { 1443 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1444 } else { 1445 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1446 jio_fprintf(defaultStream::error_stream(), 1447 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1448 (int)SurvivorAlignmentInBytes); 1449 return false; 1450 } 1451 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1452 jio_fprintf(defaultStream::error_stream(), 1453 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1454 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1455 return false; 1456 } 1457 } 1458 return true; 1459 } 1460 1461 size_t Arguments::max_heap_for_compressed_oops() { 1462 // Avoid sign flip. 1463 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1464 // We need to fit both the NULL page and the heap into the memory budget, while 1465 // keeping alignment constraints of the heap. To guarantee the latter, as the 1466 // NULL page is located before the heap, we pad the NULL page to the conservative 1467 // maximum alignment that the GC may ever impose upon the heap. 1468 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1469 _conservative_max_heap_alignment); 1470 1471 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1472 NOT_LP64(ShouldNotReachHere(); return 0); 1473 } 1474 1475 bool Arguments::should_auto_select_low_pause_collector() { 1476 if (UseAutoGCSelectPolicy && 1477 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1478 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1479 if (PrintGCDetails) { 1480 // Cannot use gclog_or_tty yet. 1481 tty->print_cr("Automatic selection of the low pause collector" 1482 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1483 } 1484 return true; 1485 } 1486 return false; 1487 } 1488 1489 void Arguments::set_use_compressed_oops() { 1490 #ifndef ZERO 1491 #ifdef _LP64 1492 // MaxHeapSize is not set up properly at this point, but 1493 // the only value that can override MaxHeapSize if we are 1494 // to use UseCompressedOops is InitialHeapSize. 1495 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1496 1497 if (max_heap_size <= max_heap_for_compressed_oops()) { 1498 #if !defined(COMPILER1) || defined(TIERED) 1499 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1500 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1501 } 1502 #endif 1503 #ifdef _WIN64 1504 if (UseLargePages && UseCompressedOops) { 1505 // Cannot allocate guard pages for implicit checks in indexed addressing 1506 // mode, when large pages are specified on windows. 1507 // This flag could be switched ON if narrow oop base address is set to 0, 1508 // see code in Universe::initialize_heap(). 1509 Universe::set_narrow_oop_use_implicit_null_checks(false); 1510 } 1511 #endif // _WIN64 1512 } else { 1513 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1514 warning("Max heap size too large for Compressed Oops"); 1515 FLAG_SET_DEFAULT(UseCompressedOops, false); 1516 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1517 } 1518 } 1519 #endif // _LP64 1520 #endif // ZERO 1521 } 1522 1523 1524 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1525 // set_use_compressed_oops(). 1526 void Arguments::set_use_compressed_klass_ptrs() { 1527 #ifndef ZERO 1528 #ifdef _LP64 1529 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1530 if (!UseCompressedOops) { 1531 if (UseCompressedClassPointers) { 1532 warning("UseCompressedClassPointers requires UseCompressedOops"); 1533 } 1534 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1535 } else { 1536 // Turn on UseCompressedClassPointers too 1537 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1538 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1539 } 1540 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1541 if (UseCompressedClassPointers) { 1542 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1543 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1544 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1545 } 1546 } 1547 } 1548 #endif // _LP64 1549 #endif // !ZERO 1550 } 1551 1552 void Arguments::set_conservative_max_heap_alignment() { 1553 // The conservative maximum required alignment for the heap is the maximum of 1554 // the alignments imposed by several sources: any requirements from the heap 1555 // itself, the collector policy and the maximum page size we may run the VM 1556 // with. 1557 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1558 #if INCLUDE_ALL_GCS 1559 if (UseParallelGC) { 1560 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1561 } else if (UseG1GC) { 1562 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1563 } 1564 #endif // INCLUDE_ALL_GCS 1565 _conservative_max_heap_alignment = MAX4(heap_alignment, 1566 (size_t)os::vm_allocation_granularity(), 1567 os::max_page_size(), 1568 CollectorPolicy::compute_heap_alignment()); 1569 } 1570 1571 void Arguments::select_gc_ergonomically() { 1572 if (os::is_server_class_machine()) { 1573 if (should_auto_select_low_pause_collector()) { 1574 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1575 } else { 1576 FLAG_SET_ERGO(bool, UseParallelGC, true); 1577 } 1578 } 1579 } 1580 1581 void Arguments::select_gc() { 1582 if (!gc_selected()) { 1583 select_gc_ergonomically(); 1584 } 1585 } 1586 1587 void Arguments::set_ergonomics_flags() { 1588 select_gc(); 1589 1590 #ifdef COMPILER2 1591 // Shared spaces work fine with other GCs but causes bytecode rewriting 1592 // to be disabled, which hurts interpreter performance and decreases 1593 // server performance. When -server is specified, keep the default off 1594 // unless it is asked for. Future work: either add bytecode rewriting 1595 // at link time, or rewrite bytecodes in non-shared methods. 1596 if (!DumpSharedSpaces && !RequireSharedSpaces && 1597 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1598 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1599 } 1600 #endif 1601 1602 set_conservative_max_heap_alignment(); 1603 1604 #ifndef ZERO 1605 #ifdef _LP64 1606 set_use_compressed_oops(); 1607 1608 // set_use_compressed_klass_ptrs() must be called after calling 1609 // set_use_compressed_oops(). 1610 set_use_compressed_klass_ptrs(); 1611 1612 // Also checks that certain machines are slower with compressed oops 1613 // in vm_version initialization code. 1614 #endif // _LP64 1615 #endif // !ZERO 1616 } 1617 1618 void Arguments::set_parallel_gc_flags() { 1619 assert(UseParallelGC || UseParallelOldGC, "Error"); 1620 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1621 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1622 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1623 } 1624 FLAG_SET_DEFAULT(UseParallelGC, true); 1625 1626 // If no heap maximum was requested explicitly, use some reasonable fraction 1627 // of the physical memory, up to a maximum of 1GB. 1628 FLAG_SET_DEFAULT(ParallelGCThreads, 1629 Abstract_VM_Version::parallel_worker_threads()); 1630 if (ParallelGCThreads == 0) { 1631 jio_fprintf(defaultStream::error_stream(), 1632 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1633 vm_exit(1); 1634 } 1635 1636 if (UseAdaptiveSizePolicy) { 1637 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1638 // unless the user actually sets these flags. 1639 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1640 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1641 _min_heap_free_ratio = MinHeapFreeRatio; 1642 } 1643 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1644 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1645 _max_heap_free_ratio = MaxHeapFreeRatio; 1646 } 1647 } 1648 1649 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1650 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1651 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1652 // See CR 6362902 for details. 1653 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1654 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1655 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1656 } 1657 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1658 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1659 } 1660 } 1661 1662 if (UseParallelOldGC) { 1663 // Par compact uses lower default values since they are treated as 1664 // minimums. These are different defaults because of the different 1665 // interpretation and are not ergonomically set. 1666 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1667 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1668 } 1669 } 1670 } 1671 1672 void Arguments::set_g1_gc_flags() { 1673 assert(UseG1GC, "Error"); 1674 #ifdef COMPILER1 1675 FastTLABRefill = false; 1676 #endif 1677 FLAG_SET_DEFAULT(ParallelGCThreads, 1678 Abstract_VM_Version::parallel_worker_threads()); 1679 if (ParallelGCThreads == 0) { 1680 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1681 } 1682 1683 #if INCLUDE_ALL_GCS 1684 if (G1ConcRefinementThreads == 0) { 1685 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1686 } 1687 #endif 1688 1689 // MarkStackSize will be set (if it hasn't been set by the user) 1690 // when concurrent marking is initialized. 1691 // Its value will be based upon the number of parallel marking threads. 1692 // But we do set the maximum mark stack size here. 1693 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1694 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1695 } 1696 1697 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1698 // In G1, we want the default GC overhead goal to be higher than 1699 // say in PS. So we set it here to 10%. Otherwise the heap might 1700 // be expanded more aggressively than we would like it to. In 1701 // fact, even 10% seems to not be high enough in some cases 1702 // (especially small GC stress tests that the main thing they do 1703 // is allocation). We might consider increase it further. 1704 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1705 } 1706 1707 if (PrintGCDetails && Verbose) { 1708 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1709 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1710 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1711 } 1712 } 1713 1714 #if !INCLUDE_ALL_GCS 1715 #ifdef ASSERT 1716 static bool verify_serial_gc_flags() { 1717 return (UseSerialGC && 1718 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1719 UseParallelGC || UseParallelOldGC)); 1720 } 1721 #endif // ASSERT 1722 #endif // INCLUDE_ALL_GCS 1723 1724 void Arguments::set_gc_specific_flags() { 1725 #if INCLUDE_ALL_GCS 1726 // Set per-collector flags 1727 if (UseParallelGC || UseParallelOldGC) { 1728 set_parallel_gc_flags(); 1729 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 1730 set_cms_and_parnew_gc_flags(); 1731 } else if (UseParNewGC) { // Skipped if CMS is set above 1732 set_parnew_gc_flags(); 1733 } else if (UseG1GC) { 1734 set_g1_gc_flags(); 1735 } 1736 check_deprecated_gcs(); 1737 check_deprecated_gc_flags(); 1738 if (AssumeMP && !UseSerialGC) { 1739 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1740 warning("If the number of processors is expected to increase from one, then" 1741 " you should configure the number of parallel GC threads appropriately" 1742 " using -XX:ParallelGCThreads=N"); 1743 } 1744 } 1745 if (MinHeapFreeRatio == 100) { 1746 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1747 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1748 } 1749 1750 // If class unloading is disabled, also disable concurrent class unloading. 1751 if (!ClassUnloading) { 1752 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1753 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 1754 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1755 } 1756 #else // INCLUDE_ALL_GCS 1757 assert(verify_serial_gc_flags(), "SerialGC unset"); 1758 #endif // INCLUDE_ALL_GCS 1759 } 1760 1761 julong Arguments::limit_by_allocatable_memory(julong limit) { 1762 julong max_allocatable; 1763 julong result = limit; 1764 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1765 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1766 } 1767 return result; 1768 } 1769 1770 void Arguments::set_heap_size() { 1771 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1772 // Deprecated flag 1773 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1774 } 1775 1776 julong phys_mem = 1777 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1778 : (julong)MaxRAM; 1779 1780 // Experimental support for CGroup memory limits 1781 if (UseCGroupMemoryLimitForHeap) { 1782 // This is a rough indicator that a CGroup limit may be in force 1783 // for this process 1784 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 1785 FILE *fp = fopen(lim_file, "r"); 1786 if (fp != NULL) { 1787 julong cgroup_max = 0; 1788 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 1789 if (ret == 1 && cgroup_max > 0) { 1790 // If unlimited, cgroup_max will be a very large, but unspecified 1791 // value, so use initial phys_mem as a limit 1792 if (PrintGCDetails && Verbose) { 1793 // Cannot use gclog_or_tty yet. 1794 tty->print_cr("Setting phys_mem to the min of cgroup limit (" 1795 JULONG_FORMAT "MB) and initial phys_mem (" 1796 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 1797 } 1798 phys_mem = MIN2(cgroup_max, phys_mem); 1799 } else { 1800 warning("Unable to read/parse cgroup memory limit from %s: %s", 1801 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 1802 } 1803 fclose(fp); 1804 } else { 1805 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 1806 } 1807 } 1808 1809 // Convert Fraction to Precentage values 1810 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1811 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1812 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1813 1814 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1815 !FLAG_IS_DEFAULT(MinRAMFraction)) 1816 MinRAMPercentage = 100.0 / MinRAMFraction; 1817 1818 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1819 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1820 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1821 1822 // If the maximum heap size has not been set with -Xmx, 1823 // then set it as fraction of the size of physical memory, 1824 // respecting the maximum and minimum sizes of the heap. 1825 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1826 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1827 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1828 if (reasonable_min < MaxHeapSize) { 1829 // Small physical memory, so use a minimum fraction of it for the heap 1830 reasonable_max = reasonable_min; 1831 } else { 1832 // Not-small physical memory, so require a heap at least 1833 // as large as MaxHeapSize 1834 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1835 } 1836 1837 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1838 // Limit the heap size to ErgoHeapSizeLimit 1839 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1840 } 1841 if (UseCompressedOops) { 1842 // Limit the heap size to the maximum possible when using compressed oops 1843 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1844 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1845 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1846 // but it should be not less than default MaxHeapSize. 1847 max_coop_heap -= HeapBaseMinAddress; 1848 } 1849 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1850 } 1851 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1852 1853 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1854 // An initial heap size was specified on the command line, 1855 // so be sure that the maximum size is consistent. Done 1856 // after call to limit_by_allocatable_memory because that 1857 // method might reduce the allocation size. 1858 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1859 } 1860 1861 if (PrintGCDetails && Verbose) { 1862 // Cannot use gclog_or_tty yet. 1863 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1864 } 1865 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1866 } 1867 1868 // If the minimum or initial heap_size have not been set or requested to be set 1869 // ergonomically, set them accordingly. 1870 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1871 julong reasonable_minimum = (julong)(OldSize + NewSize); 1872 1873 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1874 1875 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1876 1877 if (InitialHeapSize == 0) { 1878 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1879 1880 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1881 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1882 1883 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1884 1885 if (PrintGCDetails && Verbose) { 1886 // Cannot use gclog_or_tty yet. 1887 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1888 } 1889 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1890 } 1891 // If the minimum heap size has not been set (via -Xms), 1892 // synchronize with InitialHeapSize to avoid errors with the default value. 1893 if (min_heap_size() == 0) { 1894 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1895 if (PrintGCDetails && Verbose) { 1896 // Cannot use gclog_or_tty yet. 1897 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1898 } 1899 } 1900 } 1901 } 1902 1903 // This option inspects the machine and attempts to set various 1904 // parameters to be optimal for long-running, memory allocation 1905 // intensive jobs. It is intended for machines with large 1906 // amounts of cpu and memory. 1907 jint Arguments::set_aggressive_heap_flags() { 1908 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1909 // VM, but we may not be able to represent the total physical memory 1910 // available (like having 8gb of memory on a box but using a 32bit VM). 1911 // Thus, we need to make sure we're using a julong for intermediate 1912 // calculations. 1913 julong initHeapSize; 1914 julong total_memory = os::physical_memory(); 1915 1916 if (total_memory < (julong) 256 * M) { 1917 jio_fprintf(defaultStream::error_stream(), 1918 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1919 vm_exit(1); 1920 } 1921 1922 // The heap size is half of available memory, or (at most) 1923 // all of possible memory less 160mb (leaving room for the OS 1924 // when using ISM). This is the maximum; because adaptive sizing 1925 // is turned on below, the actual space used may be smaller. 1926 1927 initHeapSize = MIN2(total_memory / (julong) 2, 1928 total_memory - (julong) 160 * M); 1929 1930 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1931 1932 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1933 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 1934 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 1935 // Currently the minimum size and the initial heap sizes are the same. 1936 set_min_heap_size(initHeapSize); 1937 } 1938 if (FLAG_IS_DEFAULT(NewSize)) { 1939 // Make the young generation 3/8ths of the total heap. 1940 FLAG_SET_CMDLINE(uintx, NewSize, 1941 ((julong) MaxHeapSize / (julong) 8) * (julong) 3); 1942 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 1943 } 1944 1945 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 1946 FLAG_SET_DEFAULT(UseLargePages, true); 1947 #endif 1948 1949 // Increase some data structure sizes for efficiency 1950 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 1951 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 1952 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K); 1953 1954 // See the OldPLABSize comment below, but replace 'after promotion' 1955 // with 'after copying'. YoungPLABSize is the size of the survivor 1956 // space per-gc-thread buffers. The default is 4kw. 1957 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words 1958 1959 // OldPLABSize is the size of the buffers in the old gen that 1960 // UseParallelGC uses to promote live data that doesn't fit in the 1961 // survivor spaces. At any given time, there's one for each gc thread. 1962 // The default size is 1kw. These buffers are rarely used, since the 1963 // survivor spaces are usually big enough. For specjbb, however, there 1964 // are occasions when there's lots of live data in the young gen 1965 // and we end up promoting some of it. We don't have a definite 1966 // explanation for why bumping OldPLABSize helps, but the theory 1967 // is that a bigger PLAB results in retaining something like the 1968 // original allocation order after promotion, which improves mutator 1969 // locality. A minor effect may be that larger PLABs reduce the 1970 // number of PLAB allocation events during gc. The value of 8kw 1971 // was arrived at by experimenting with specjbb. 1972 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words 1973 1974 // Enable parallel GC and adaptive generation sizing 1975 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 1976 1977 // Encourage steady state memory management 1978 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 1979 1980 // This appears to improve mutator locality 1981 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1982 1983 // Get around early Solaris scheduling bug 1984 // (affinity vs other jobs on system) 1985 // but disallow DR and offlining (5008695). 1986 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 1987 1988 return JNI_OK; 1989 } 1990 1991 // This must be called after ergonomics because we want bytecode rewriting 1992 // if the server compiler is used, or if UseSharedSpaces is disabled. 1993 void Arguments::set_bytecode_flags() { 1994 // Better not attempt to store into a read-only space. 1995 if (UseSharedSpaces) { 1996 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1997 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1998 } 1999 2000 if (!RewriteBytecodes) { 2001 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2002 } 2003 } 2004 2005 // Aggressive optimization flags -XX:+AggressiveOpts 2006 void Arguments::set_aggressive_opts_flags() { 2007 #ifdef COMPILER2 2008 if (AggressiveUnboxing) { 2009 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2010 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2011 } else if (!EliminateAutoBox) { 2012 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2013 AggressiveUnboxing = false; 2014 } 2015 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2016 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2017 } else if (!DoEscapeAnalysis) { 2018 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2019 AggressiveUnboxing = false; 2020 } 2021 } 2022 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2023 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2024 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2025 } 2026 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2027 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2028 } 2029 2030 // Feed the cache size setting into the JDK 2031 char buffer[1024]; 2032 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2033 add_property(buffer); 2034 } 2035 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2036 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2037 } 2038 #endif 2039 2040 if (AggressiveOpts) { 2041 // Sample flag setting code 2042 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2043 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2044 // } 2045 } 2046 } 2047 2048 //=========================================================================================================== 2049 // Parsing of java.compiler property 2050 2051 void Arguments::process_java_compiler_argument(char* arg) { 2052 // For backwards compatibility, Djava.compiler=NONE or "" 2053 // causes us to switch to -Xint mode UNLESS -Xdebug 2054 // is also specified. 2055 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2056 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2057 } 2058 } 2059 2060 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2061 _sun_java_launcher = strdup(launcher); 2062 if (strcmp("gamma", _sun_java_launcher) == 0) { 2063 _created_by_gamma_launcher = true; 2064 } 2065 } 2066 2067 bool Arguments::created_by_java_launcher() { 2068 assert(_sun_java_launcher != NULL, "property must have value"); 2069 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2070 } 2071 2072 bool Arguments::created_by_gamma_launcher() { 2073 return _created_by_gamma_launcher; 2074 } 2075 2076 //=========================================================================================================== 2077 // Parsing of main arguments 2078 2079 bool Arguments::verify_interval(uintx val, uintx min, 2080 uintx max, const char* name) { 2081 // Returns true iff value is in the inclusive interval [min..max] 2082 // false, otherwise. 2083 if (val >= min && val <= max) { 2084 return true; 2085 } 2086 jio_fprintf(defaultStream::error_stream(), 2087 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 2088 " and " UINTX_FORMAT "\n", 2089 name, val, min, max); 2090 return false; 2091 } 2092 2093 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 2094 // Returns true if given value is at least specified min threshold 2095 // false, otherwise. 2096 if (val >= min ) { 2097 return true; 2098 } 2099 jio_fprintf(defaultStream::error_stream(), 2100 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 2101 name, val, min); 2102 return false; 2103 } 2104 2105 bool Arguments::verify_percentage(uintx value, const char* name) { 2106 if (is_percentage(value)) { 2107 return true; 2108 } 2109 jio_fprintf(defaultStream::error_stream(), 2110 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2111 name, value); 2112 return false; 2113 } 2114 2115 // check if do gclog rotation 2116 // +UseGCLogFileRotation is a must, 2117 // no gc log rotation when log file not supplied or 2118 // NumberOfGCLogFiles is 0 2119 void check_gclog_consistency() { 2120 if (UseGCLogFileRotation) { 2121 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2122 jio_fprintf(defaultStream::output_stream(), 2123 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2124 "where num_of_file > 0\n" 2125 "GC log rotation is turned off\n"); 2126 UseGCLogFileRotation = false; 2127 } 2128 } 2129 2130 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2131 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2132 jio_fprintf(defaultStream::output_stream(), 2133 "GCLogFileSize changed to minimum 8K\n"); 2134 } 2135 } 2136 2137 // This function is called for -Xloggc:<filename>, it can be used 2138 // to check if a given file name(or string) conforms to the following 2139 // specification: 2140 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2141 // %p and %t only allowed once. We only limit usage of filename not path 2142 bool is_filename_valid(const char *file_name) { 2143 const char* p = file_name; 2144 char file_sep = os::file_separator()[0]; 2145 const char* cp; 2146 // skip prefix path 2147 for (cp = file_name; *cp != '\0'; cp++) { 2148 if (*cp == '/' || *cp == file_sep) { 2149 p = cp + 1; 2150 } 2151 } 2152 2153 int count_p = 0; 2154 int count_t = 0; 2155 while (*p != '\0') { 2156 if ((*p >= '0' && *p <= '9') || 2157 (*p >= 'A' && *p <= 'Z') || 2158 (*p >= 'a' && *p <= 'z') || 2159 *p == '-' || 2160 *p == '_' || 2161 *p == '.') { 2162 p++; 2163 continue; 2164 } 2165 if (*p == '%') { 2166 if(*(p + 1) == 'p') { 2167 p += 2; 2168 count_p ++; 2169 continue; 2170 } 2171 if (*(p + 1) == 't') { 2172 p += 2; 2173 count_t ++; 2174 continue; 2175 } 2176 } 2177 return false; 2178 } 2179 return count_p < 2 && count_t < 2; 2180 } 2181 2182 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2183 if (!is_percentage(min_heap_free_ratio)) { 2184 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2185 return false; 2186 } 2187 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2188 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2189 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2190 MaxHeapFreeRatio); 2191 return false; 2192 } 2193 // This does not set the flag itself, but stores the value in a safe place for later usage. 2194 _min_heap_free_ratio = min_heap_free_ratio; 2195 return true; 2196 } 2197 2198 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2199 if (!is_percentage(max_heap_free_ratio)) { 2200 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2201 return false; 2202 } 2203 if (max_heap_free_ratio < MinHeapFreeRatio) { 2204 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2205 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2206 MinHeapFreeRatio); 2207 return false; 2208 } 2209 // This does not set the flag itself, but stores the value in a safe place for later usage. 2210 _max_heap_free_ratio = max_heap_free_ratio; 2211 return true; 2212 } 2213 2214 // Check consistency of GC selection 2215 bool Arguments::check_gc_consistency() { 2216 check_gclog_consistency(); 2217 bool status = true; 2218 // Ensure that the user has not selected conflicting sets 2219 // of collectors. [Note: this check is merely a user convenience; 2220 // collectors over-ride each other so that only a non-conflicting 2221 // set is selected; however what the user gets is not what they 2222 // may have expected from the combination they asked for. It's 2223 // better to reduce user confusion by not allowing them to 2224 // select conflicting combinations. 2225 uint i = 0; 2226 if (UseSerialGC) i++; 2227 if (UseConcMarkSweepGC || UseParNewGC) i++; 2228 if (UseParallelGC || UseParallelOldGC) i++; 2229 if (UseG1GC) i++; 2230 if (i > 1) { 2231 jio_fprintf(defaultStream::error_stream(), 2232 "Conflicting collector combinations in option list; " 2233 "please refer to the release notes for the combinations " 2234 "allowed\n"); 2235 status = false; 2236 } 2237 return status; 2238 } 2239 2240 void Arguments::check_deprecated_gcs() { 2241 if (UseConcMarkSweepGC && !UseParNewGC) { 2242 warning("Using the DefNew young collector with the CMS collector is deprecated " 2243 "and will likely be removed in a future release"); 2244 } 2245 2246 if (UseParNewGC && !UseConcMarkSweepGC) { 2247 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2248 // set up UseSerialGC properly, so that can't be used in the check here. 2249 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2250 "and will likely be removed in a future release"); 2251 } 2252 2253 if (CMSIncrementalMode) { 2254 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2255 } 2256 } 2257 2258 void Arguments::check_deprecated_gc_flags() { 2259 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2260 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2261 "and will likely be removed in future release"); 2262 } 2263 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2264 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2265 "Use MaxRAMFraction instead."); 2266 } 2267 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2268 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2269 } 2270 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2271 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2272 } 2273 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2274 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2275 } 2276 } 2277 2278 // Check stack pages settings 2279 bool Arguments::check_stack_pages() 2280 { 2281 bool status = true; 2282 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2283 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2284 // greater stack shadow pages can't generate instruction to bang stack 2285 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2286 return status; 2287 } 2288 2289 // Check the consistency of vm_init_args 2290 bool Arguments::check_vm_args_consistency() { 2291 // Method for adding checks for flag consistency. 2292 // The intent is to warn the user of all possible conflicts, 2293 // before returning an error. 2294 // Note: Needs platform-dependent factoring. 2295 bool status = true; 2296 2297 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 2298 // builds so the cost of stack banging can be measured. 2299 #if (defined(PRODUCT) && defined(SOLARIS)) 2300 if (!UseBoundThreads && !UseStackBanging) { 2301 jio_fprintf(defaultStream::error_stream(), 2302 "-UseStackBanging conflicts with -UseBoundThreads\n"); 2303 2304 status = false; 2305 } 2306 #endif 2307 2308 if (TLABRefillWasteFraction == 0) { 2309 jio_fprintf(defaultStream::error_stream(), 2310 "TLABRefillWasteFraction should be a denominator, " 2311 "not " SIZE_FORMAT "\n", 2312 TLABRefillWasteFraction); 2313 status = false; 2314 } 2315 2316 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2317 "AdaptiveSizePolicyWeight"); 2318 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2319 2320 // Divide by bucket size to prevent a large size from causing rollover when 2321 // calculating amount of memory needed to be allocated for the String table. 2322 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2323 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2324 2325 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2326 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2327 2328 { 2329 // Using "else if" below to avoid printing two error messages if min > max. 2330 // This will also prevent us from reporting both min>100 and max>100 at the 2331 // same time, but that is less annoying than printing two identical errors IMHO. 2332 FormatBuffer<80> err_msg("%s",""); 2333 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2334 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2335 status = false; 2336 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2337 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2338 status = false; 2339 } 2340 } 2341 2342 // Min/MaxMetaspaceFreeRatio 2343 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2344 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2345 2346 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2347 jio_fprintf(defaultStream::error_stream(), 2348 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2349 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2350 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2351 MinMetaspaceFreeRatio, 2352 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2353 MaxMetaspaceFreeRatio); 2354 status = false; 2355 } 2356 2357 // Trying to keep 100% free is not practical 2358 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2359 2360 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2361 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2362 } 2363 2364 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2365 // Settings to encourage splitting. 2366 if (!FLAG_IS_CMDLINE(NewRatio)) { 2367 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2368 } 2369 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2370 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2371 } 2372 } 2373 2374 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2375 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2376 if (GCTimeLimit == 100) { 2377 // Turn off gc-overhead-limit-exceeded checks 2378 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2379 } 2380 2381 status = status && check_gc_consistency(); 2382 status = status && check_stack_pages(); 2383 2384 if (CMSIncrementalMode) { 2385 if (!UseConcMarkSweepGC) { 2386 jio_fprintf(defaultStream::error_stream(), 2387 "error: invalid argument combination.\n" 2388 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2389 "selected in order\nto use CMSIncrementalMode.\n"); 2390 status = false; 2391 } else { 2392 status = status && verify_percentage(CMSIncrementalDutyCycle, 2393 "CMSIncrementalDutyCycle"); 2394 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2395 "CMSIncrementalDutyCycleMin"); 2396 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2397 "CMSIncrementalSafetyFactor"); 2398 status = status && verify_percentage(CMSIncrementalOffset, 2399 "CMSIncrementalOffset"); 2400 status = status && verify_percentage(CMSExpAvgFactor, 2401 "CMSExpAvgFactor"); 2402 // If it was not set on the command line, set 2403 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2404 if (CMSInitiatingOccupancyFraction < 0) { 2405 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2406 } 2407 } 2408 } 2409 2410 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2411 // insists that we hold the requisite locks so that the iteration is 2412 // MT-safe. For the verification at start-up and shut-down, we don't 2413 // yet have a good way of acquiring and releasing these locks, 2414 // which are not visible at the CollectedHeap level. We want to 2415 // be able to acquire these locks and then do the iteration rather 2416 // than just disable the lock verification. This will be fixed under 2417 // bug 4788986. 2418 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2419 if (VerifyDuringStartup) { 2420 warning("Heap verification at start-up disabled " 2421 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2422 VerifyDuringStartup = false; // Disable verification at start-up 2423 } 2424 2425 if (VerifyBeforeExit) { 2426 warning("Heap verification at shutdown disabled " 2427 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2428 VerifyBeforeExit = false; // Disable verification at shutdown 2429 } 2430 } 2431 2432 // Note: only executed in non-PRODUCT mode 2433 if (!UseAsyncConcMarkSweepGC && 2434 (ExplicitGCInvokesConcurrent || 2435 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2436 jio_fprintf(defaultStream::error_stream(), 2437 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2438 " with -UseAsyncConcMarkSweepGC"); 2439 status = false; 2440 } 2441 2442 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2443 2444 #if INCLUDE_ALL_GCS 2445 if (UseG1GC) { 2446 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2447 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2448 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2449 2450 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2451 "InitiatingHeapOccupancyPercent"); 2452 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2453 "G1RefProcDrainInterval"); 2454 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2455 "G1ConcMarkStepDurationMillis"); 2456 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2457 "G1ConcRSHotCardLimit"); 2458 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27, 2459 "G1ConcRSLogCacheSize"); 2460 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2461 "StringDeduplicationAgeThreshold"); 2462 } 2463 if (UseConcMarkSweepGC) { 2464 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2465 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2466 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2467 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2468 2469 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2470 2471 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2472 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2473 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2474 2475 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2476 2477 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2478 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2479 2480 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2481 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2482 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2483 2484 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2485 2486 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2487 2488 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2489 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2490 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2491 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2492 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2493 } 2494 2495 if (UseParallelGC || UseParallelOldGC) { 2496 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2497 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2498 2499 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2500 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2501 2502 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2503 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2504 2505 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2506 2507 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2508 } 2509 #endif // INCLUDE_ALL_GCS 2510 2511 status = status && verify_interval(RefDiscoveryPolicy, 2512 ReferenceProcessor::DiscoveryPolicyMin, 2513 ReferenceProcessor::DiscoveryPolicyMax, 2514 "RefDiscoveryPolicy"); 2515 2516 // Limit the lower bound of this flag to 1 as it is used in a division 2517 // expression. 2518 status = status && verify_interval(TLABWasteTargetPercent, 2519 1, 100, "TLABWasteTargetPercent"); 2520 2521 status = status && verify_object_alignment(); 2522 2523 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2524 "CompressedClassSpaceSize"); 2525 2526 status = status && verify_interval(MarkStackSizeMax, 2527 1, (max_jint - 1), "MarkStackSizeMax"); 2528 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2529 2530 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2531 2532 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2533 2534 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2535 2536 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2537 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2538 2539 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2540 2541 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2542 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2543 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2544 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2545 2546 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2547 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2548 2549 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2550 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2551 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2552 2553 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2554 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2555 2556 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2557 // just for that, so hardcode here. 2558 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2559 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2560 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2561 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2562 2563 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2564 #ifdef COMPILER1 2565 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2566 #endif 2567 2568 if (PrintNMTStatistics) { 2569 #if INCLUDE_NMT 2570 if (MemTracker::tracking_level() == NMT_off) { 2571 #endif // INCLUDE_NMT 2572 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2573 PrintNMTStatistics = false; 2574 #if INCLUDE_NMT 2575 } 2576 #endif 2577 } 2578 2579 // Need to limit the extent of the padding to reasonable size. 2580 // 8K is well beyond the reasonable HW cache line size, even with the 2581 // aggressive prefetching, while still leaving the room for segregating 2582 // among the distinct pages. 2583 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2584 jio_fprintf(defaultStream::error_stream(), 2585 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2586 ContendedPaddingWidth, 0, 8192); 2587 status = false; 2588 } 2589 2590 // Need to enforce the padding not to break the existing field alignments. 2591 // It is sufficient to check against the largest type size. 2592 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2593 jio_fprintf(defaultStream::error_stream(), 2594 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2595 ContendedPaddingWidth, BytesPerLong); 2596 status = false; 2597 } 2598 2599 // Check lower bounds of the code cache 2600 // Template Interpreter code is approximately 3X larger in debug builds. 2601 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2602 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2603 jio_fprintf(defaultStream::error_stream(), 2604 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2605 os::vm_page_size()/K); 2606 status = false; 2607 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2608 jio_fprintf(defaultStream::error_stream(), 2609 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2610 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2611 status = false; 2612 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2613 jio_fprintf(defaultStream::error_stream(), 2614 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2615 min_code_cache_size/K); 2616 status = false; 2617 } else if (ReservedCodeCacheSize > 2*G) { 2618 // Code cache size larger than MAXINT is not supported. 2619 jio_fprintf(defaultStream::error_stream(), 2620 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2621 (2*G)/M); 2622 status = false; 2623 } 2624 2625 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2626 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2627 2628 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2629 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2630 } 2631 2632 #ifdef COMPILER1 2633 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset"); 2634 #endif 2635 2636 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2637 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2638 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2639 // Check the minimum number of compiler threads 2640 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2641 2642 return status; 2643 } 2644 2645 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2646 const char* option_type) { 2647 if (ignore) return false; 2648 2649 const char* spacer = " "; 2650 if (option_type == NULL) { 2651 option_type = ++spacer; // Set both to the empty string. 2652 } 2653 2654 if (os::obsolete_option(option)) { 2655 jio_fprintf(defaultStream::error_stream(), 2656 "Obsolete %s%soption: %s\n", option_type, spacer, 2657 option->optionString); 2658 return false; 2659 } else { 2660 jio_fprintf(defaultStream::error_stream(), 2661 "Unrecognized %s%soption: %s\n", option_type, spacer, 2662 option->optionString); 2663 return true; 2664 } 2665 } 2666 2667 static const char* user_assertion_options[] = { 2668 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2669 }; 2670 2671 static const char* system_assertion_options[] = { 2672 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2673 }; 2674 2675 // Return true if any of the strings in null-terminated array 'names' matches. 2676 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2677 // the option must match exactly. 2678 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2679 bool tail_allowed) { 2680 for (/* empty */; *names != NULL; ++names) { 2681 if (match_option(option, *names, tail)) { 2682 if (**tail == '\0' || tail_allowed && **tail == ':') { 2683 return true; 2684 } 2685 } 2686 } 2687 return false; 2688 } 2689 2690 bool Arguments::parse_uintx(const char* value, 2691 uintx* uintx_arg, 2692 uintx min_size) { 2693 2694 // Check the sign first since atomull() parses only unsigned values. 2695 bool value_is_positive = !(*value == '-'); 2696 2697 if (value_is_positive) { 2698 julong n; 2699 bool good_return = atomull(value, &n); 2700 if (good_return) { 2701 bool above_minimum = n >= min_size; 2702 bool value_is_too_large = n > max_uintx; 2703 2704 if (above_minimum && !value_is_too_large) { 2705 *uintx_arg = n; 2706 return true; 2707 } 2708 } 2709 } 2710 return false; 2711 } 2712 2713 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2714 julong* long_arg, 2715 julong min_size) { 2716 if (!atomull(s, long_arg)) return arg_unreadable; 2717 return check_memory_size(*long_arg, min_size); 2718 } 2719 2720 // Parse JavaVMInitArgs structure 2721 2722 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2723 // For components of the system classpath. 2724 SysClassPath scp(Arguments::get_sysclasspath()); 2725 bool scp_assembly_required = false; 2726 2727 // Save default settings for some mode flags 2728 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2729 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2730 Arguments::_ClipInlining = ClipInlining; 2731 Arguments::_BackgroundCompilation = BackgroundCompilation; 2732 2733 // Setup flags for mixed which is the default 2734 set_mode_flags(_mixed); 2735 2736 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2737 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2738 if (result != JNI_OK) { 2739 return result; 2740 } 2741 2742 // Parse JavaVMInitArgs structure passed in 2743 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2744 if (result != JNI_OK) { 2745 return result; 2746 } 2747 2748 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2749 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2750 if (result != JNI_OK) { 2751 return result; 2752 } 2753 2754 // We need to ensure processor and memory resources have been properly 2755 // configured - which may rely on arguments we just processed - before 2756 // doing the final argument processing. Any argument processing that 2757 // needs to know about processor and memory resources must occur after 2758 // this point. 2759 2760 os::init_container_support(); 2761 2762 // Do final processing now that all arguments have been parsed 2763 result = finalize_vm_init_args(&scp, scp_assembly_required); 2764 if (result != JNI_OK) { 2765 return result; 2766 } 2767 2768 return JNI_OK; 2769 } 2770 2771 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2772 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2773 // are dealing with -agentpath (case where name is a path), otherwise with 2774 // -agentlib 2775 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2776 char *_name; 2777 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2778 size_t _len_hprof, _len_jdwp, _len_prefix; 2779 2780 if (is_path) { 2781 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2782 return false; 2783 } 2784 2785 _name++; // skip past last path separator 2786 _len_prefix = strlen(JNI_LIB_PREFIX); 2787 2788 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2789 return false; 2790 } 2791 2792 _name += _len_prefix; 2793 _len_hprof = strlen(_hprof); 2794 _len_jdwp = strlen(_jdwp); 2795 2796 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2797 _name += _len_hprof; 2798 } 2799 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2800 _name += _len_jdwp; 2801 } 2802 else { 2803 return false; 2804 } 2805 2806 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2807 return false; 2808 } 2809 2810 return true; 2811 } 2812 2813 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2814 return true; 2815 } 2816 2817 return false; 2818 } 2819 2820 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2821 SysClassPath* scp_p, 2822 bool* scp_assembly_required_p, 2823 Flag::Flags origin) { 2824 // Remaining part of option string 2825 const char* tail; 2826 2827 // iterate over arguments 2828 for (int index = 0; index < args->nOptions; index++) { 2829 bool is_absolute_path = false; // for -agentpath vs -agentlib 2830 2831 const JavaVMOption* option = args->options + index; 2832 2833 if (!match_option(option, "-Djava.class.path", &tail) && 2834 !match_option(option, "-Dsun.java.command", &tail) && 2835 !match_option(option, "-Dsun.java.launcher", &tail)) { 2836 2837 // add all jvm options to the jvm_args string. This string 2838 // is used later to set the java.vm.args PerfData string constant. 2839 // the -Djava.class.path and the -Dsun.java.command options are 2840 // omitted from jvm_args string as each have their own PerfData 2841 // string constant object. 2842 build_jvm_args(option->optionString); 2843 } 2844 2845 // -verbose:[class/gc/jni] 2846 if (match_option(option, "-verbose", &tail)) { 2847 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2848 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2849 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2850 } else if (!strcmp(tail, ":gc")) { 2851 FLAG_SET_CMDLINE(bool, PrintGC, true); 2852 } else if (!strcmp(tail, ":jni")) { 2853 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2854 } 2855 // -da / -ea / -disableassertions / -enableassertions 2856 // These accept an optional class/package name separated by a colon, e.g., 2857 // -da:java.lang.Thread. 2858 } else if (match_option(option, user_assertion_options, &tail, true)) { 2859 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2860 if (*tail == '\0') { 2861 JavaAssertions::setUserClassDefault(enable); 2862 } else { 2863 assert(*tail == ':', "bogus match by match_option()"); 2864 JavaAssertions::addOption(tail + 1, enable); 2865 } 2866 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2867 } else if (match_option(option, system_assertion_options, &tail, false)) { 2868 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2869 JavaAssertions::setSystemClassDefault(enable); 2870 // -bootclasspath: 2871 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2872 scp_p->reset_path(tail); 2873 *scp_assembly_required_p = true; 2874 // -bootclasspath/a: 2875 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2876 scp_p->add_suffix(tail); 2877 *scp_assembly_required_p = true; 2878 // -bootclasspath/p: 2879 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2880 scp_p->add_prefix(tail); 2881 *scp_assembly_required_p = true; 2882 // -Xrun 2883 } else if (match_option(option, "-Xrun", &tail)) { 2884 if (tail != NULL) { 2885 const char* pos = strchr(tail, ':'); 2886 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2887 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2888 name[len] = '\0'; 2889 2890 char *options = NULL; 2891 if(pos != NULL) { 2892 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2893 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2894 } 2895 #if !INCLUDE_JVMTI 2896 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2897 jio_fprintf(defaultStream::error_stream(), 2898 "Profiling and debugging agents are not supported in this VM\n"); 2899 return JNI_ERR; 2900 } 2901 #endif // !INCLUDE_JVMTI 2902 add_init_library(name, options); 2903 } 2904 // -agentlib and -agentpath 2905 } else if (match_option(option, "-agentlib:", &tail) || 2906 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2907 if(tail != NULL) { 2908 const char* pos = strchr(tail, '='); 2909 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2910 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2911 name[len] = '\0'; 2912 2913 char *options = NULL; 2914 if(pos != NULL) { 2915 size_t length = strlen(pos + 1) + 1; 2916 options = NEW_C_HEAP_ARRAY(char, length, mtInternal); 2917 jio_snprintf(options, length, "%s", pos + 1); 2918 } 2919 #if !INCLUDE_JVMTI 2920 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2921 jio_fprintf(defaultStream::error_stream(), 2922 "Profiling and debugging agents are not supported in this VM\n"); 2923 return JNI_ERR; 2924 } 2925 #endif // !INCLUDE_JVMTI 2926 add_init_agent(name, options, is_absolute_path); 2927 } 2928 // -javaagent 2929 } else if (match_option(option, "-javaagent:", &tail)) { 2930 #if !INCLUDE_JVMTI 2931 jio_fprintf(defaultStream::error_stream(), 2932 "Instrumentation agents are not supported in this VM\n"); 2933 return JNI_ERR; 2934 #else 2935 if(tail != NULL) { 2936 size_t length = strlen(tail) + 1; 2937 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal); 2938 jio_snprintf(options, length, "%s", tail); 2939 add_init_agent("instrument", options, false); 2940 } 2941 #endif // !INCLUDE_JVMTI 2942 // -Xnoclassgc 2943 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2944 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2945 // -Xincgc: i-CMS 2946 } else if (match_option(option, "-Xincgc", &tail)) { 2947 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2948 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2949 // -Xnoincgc: no i-CMS 2950 } else if (match_option(option, "-Xnoincgc", &tail)) { 2951 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2952 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2953 // -Xconcgc 2954 } else if (match_option(option, "-Xconcgc", &tail)) { 2955 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2956 // -Xnoconcgc 2957 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2958 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2959 // -Xbatch 2960 } else if (match_option(option, "-Xbatch", &tail)) { 2961 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2962 // -Xmn for compatibility with other JVM vendors 2963 } else if (match_option(option, "-Xmn", &tail)) { 2964 julong long_initial_young_size = 0; 2965 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2966 if (errcode != arg_in_range) { 2967 jio_fprintf(defaultStream::error_stream(), 2968 "Invalid initial young generation size: %s\n", option->optionString); 2969 describe_range_error(errcode); 2970 return JNI_EINVAL; 2971 } 2972 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2973 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2974 // -Xms 2975 } else if (match_option(option, "-Xms", &tail)) { 2976 julong long_initial_heap_size = 0; 2977 // an initial heap size of 0 means automatically determine 2978 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2979 if (errcode != arg_in_range) { 2980 jio_fprintf(defaultStream::error_stream(), 2981 "Invalid initial heap size: %s\n", option->optionString); 2982 describe_range_error(errcode); 2983 return JNI_EINVAL; 2984 } 2985 set_min_heap_size((uintx)long_initial_heap_size); 2986 // Currently the minimum size and the initial heap sizes are the same. 2987 // Can be overridden with -XX:InitialHeapSize. 2988 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2989 // -Xmx 2990 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2991 julong long_max_heap_size = 0; 2992 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2993 if (errcode != arg_in_range) { 2994 jio_fprintf(defaultStream::error_stream(), 2995 "Invalid maximum heap size: %s\n", option->optionString); 2996 describe_range_error(errcode); 2997 return JNI_EINVAL; 2998 } 2999 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 3000 // Xmaxf 3001 } else if (match_option(option, "-Xmaxf", &tail)) { 3002 char* err; 3003 int maxf = (int)(strtod(tail, &err) * 100); 3004 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 3005 jio_fprintf(defaultStream::error_stream(), 3006 "Bad max heap free percentage size: %s\n", 3007 option->optionString); 3008 return JNI_EINVAL; 3009 } else { 3010 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 3011 } 3012 // Xminf 3013 } else if (match_option(option, "-Xminf", &tail)) { 3014 char* err; 3015 int minf = (int)(strtod(tail, &err) * 100); 3016 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 3017 jio_fprintf(defaultStream::error_stream(), 3018 "Bad min heap free percentage size: %s\n", 3019 option->optionString); 3020 return JNI_EINVAL; 3021 } else { 3022 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 3023 } 3024 // -Xss 3025 } else if (match_option(option, "-Xss", &tail)) { 3026 julong long_ThreadStackSize = 0; 3027 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3028 if (errcode != arg_in_range) { 3029 jio_fprintf(defaultStream::error_stream(), 3030 "Invalid thread stack size: %s\n", option->optionString); 3031 describe_range_error(errcode); 3032 return JNI_EINVAL; 3033 } 3034 // Internally track ThreadStackSize in units of 1024 bytes. 3035 FLAG_SET_CMDLINE(intx, ThreadStackSize, 3036 round_to((int)long_ThreadStackSize, K) / K); 3037 // -Xoss 3038 } else if (match_option(option, "-Xoss", &tail)) { 3039 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 3040 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3041 julong long_CodeCacheExpansionSize = 0; 3042 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3043 if (errcode != arg_in_range) { 3044 jio_fprintf(defaultStream::error_stream(), 3045 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3046 os::vm_page_size()/K); 3047 return JNI_EINVAL; 3048 } 3049 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 3050 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3051 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3052 julong long_ReservedCodeCacheSize = 0; 3053 3054 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3055 if (errcode != arg_in_range) { 3056 jio_fprintf(defaultStream::error_stream(), 3057 "Invalid maximum code cache size: %s.\n", option->optionString); 3058 return JNI_EINVAL; 3059 } 3060 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 3061 //-XX:IncreaseFirstTierCompileThresholdAt= 3062 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 3063 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 3064 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 3065 jio_fprintf(defaultStream::error_stream(), 3066 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 3067 option->optionString); 3068 return JNI_EINVAL; 3069 } 3070 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 3071 // -green 3072 } else if (match_option(option, "-green", &tail)) { 3073 jio_fprintf(defaultStream::error_stream(), 3074 "Green threads support not available\n"); 3075 return JNI_EINVAL; 3076 // -native 3077 } else if (match_option(option, "-native", &tail)) { 3078 // HotSpot always uses native threads, ignore silently for compatibility 3079 // -Xsqnopause 3080 } else if (match_option(option, "-Xsqnopause", &tail)) { 3081 // EVM option, ignore silently for compatibility 3082 // -Xrs 3083 } else if (match_option(option, "-Xrs", &tail)) { 3084 // Classic/EVM option, new functionality 3085 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 3086 } else if (match_option(option, "-Xusealtsigs", &tail)) { 3087 // change default internal VM signals used - lower case for back compat 3088 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 3089 // -Xoptimize 3090 } else if (match_option(option, "-Xoptimize", &tail)) { 3091 // EVM option, ignore silently for compatibility 3092 // -Xprof 3093 } else if (match_option(option, "-Xprof", &tail)) { 3094 #if INCLUDE_FPROF 3095 _has_profile = true; 3096 #else // INCLUDE_FPROF 3097 jio_fprintf(defaultStream::error_stream(), 3098 "Flat profiling is not supported in this VM.\n"); 3099 return JNI_ERR; 3100 #endif // INCLUDE_FPROF 3101 // -Xconcurrentio 3102 } else if (match_option(option, "-Xconcurrentio", &tail)) { 3103 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 3104 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 3105 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 3106 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3107 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 3108 3109 // -Xinternalversion 3110 } else if (match_option(option, "-Xinternalversion", &tail)) { 3111 jio_fprintf(defaultStream::output_stream(), "%s\n", 3112 VM_Version::internal_vm_info_string()); 3113 vm_exit(0); 3114 #ifndef PRODUCT 3115 // -Xprintflags 3116 } else if (match_option(option, "-Xprintflags", &tail)) { 3117 CommandLineFlags::printFlags(tty, false); 3118 vm_exit(0); 3119 #endif 3120 // -D 3121 } else if (match_option(option, "-D", &tail)) { 3122 if (CheckEndorsedAndExtDirs) { 3123 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) { 3124 // abort if -Djava.endorsed.dirs is set 3125 jio_fprintf(defaultStream::output_stream(), 3126 "-Djava.endorsed.dirs will not be supported in a future release.\n" 3127 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n"); 3128 return JNI_EINVAL; 3129 } 3130 if (match_option(option, "-Djava.ext.dirs=", &tail)) { 3131 // abort if -Djava.ext.dirs is set 3132 jio_fprintf(defaultStream::output_stream(), 3133 "-Djava.ext.dirs will not be supported in a future release.\n" 3134 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n"); 3135 return JNI_EINVAL; 3136 } 3137 } 3138 3139 if (!add_property(tail)) { 3140 return JNI_ENOMEM; 3141 } 3142 // Out of the box management support 3143 if (match_option(option, "-Dcom.sun.management", &tail)) { 3144 #if INCLUDE_MANAGEMENT 3145 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3146 #else 3147 jio_fprintf(defaultStream::output_stream(), 3148 "-Dcom.sun.management is not supported in this VM.\n"); 3149 return JNI_ERR; 3150 #endif 3151 } 3152 // -Xint 3153 } else if (match_option(option, "-Xint", &tail)) { 3154 set_mode_flags(_int); 3155 // -Xmixed 3156 } else if (match_option(option, "-Xmixed", &tail)) { 3157 set_mode_flags(_mixed); 3158 // -Xcomp 3159 } else if (match_option(option, "-Xcomp", &tail)) { 3160 // for testing the compiler; turn off all flags that inhibit compilation 3161 set_mode_flags(_comp); 3162 // -Xshare:dump 3163 } else if (match_option(option, "-Xshare:dump", &tail)) { 3164 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3165 set_mode_flags(_int); // Prevent compilation, which creates objects 3166 // -Xshare:on 3167 } else if (match_option(option, "-Xshare:on", &tail)) { 3168 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3169 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3170 // -Xshare:auto 3171 } else if (match_option(option, "-Xshare:auto", &tail)) { 3172 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3173 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3174 // -Xshare:off 3175 } else if (match_option(option, "-Xshare:off", &tail)) { 3176 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3177 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3178 // -Xverify 3179 } else if (match_option(option, "-Xverify", &tail)) { 3180 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3181 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3182 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3183 } else if (strcmp(tail, ":remote") == 0) { 3184 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3185 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3186 } else if (strcmp(tail, ":none") == 0) { 3187 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3188 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3189 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3190 return JNI_EINVAL; 3191 } 3192 // -Xdebug 3193 } else if (match_option(option, "-Xdebug", &tail)) { 3194 // note this flag has been used, then ignore 3195 set_xdebug_mode(true); 3196 // -Xnoagent 3197 } else if (match_option(option, "-Xnoagent", &tail)) { 3198 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3199 } else if (match_option(option, "-Xboundthreads", &tail)) { 3200 // Bind user level threads to kernel threads (Solaris only) 3201 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3202 } else if (match_option(option, "-Xloggc:", &tail)) { 3203 // Redirect GC output to the file. -Xloggc:<filename> 3204 // ostream_init_log(), when called will use this filename 3205 // to initialize a fileStream. 3206 _gc_log_filename = strdup(tail); 3207 if (!is_filename_valid(_gc_log_filename)) { 3208 jio_fprintf(defaultStream::output_stream(), 3209 "Invalid file name for use with -Xloggc: Filename can only contain the " 3210 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3211 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3212 return JNI_EINVAL; 3213 } 3214 FLAG_SET_CMDLINE(bool, PrintGC, true); 3215 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3216 3217 // JNI hooks 3218 } else if (match_option(option, "-Xcheck", &tail)) { 3219 if (!strcmp(tail, ":jni")) { 3220 #if !INCLUDE_JNI_CHECK 3221 warning("JNI CHECKING is not supported in this VM"); 3222 #else 3223 CheckJNICalls = true; 3224 #endif // INCLUDE_JNI_CHECK 3225 } else if (is_bad_option(option, args->ignoreUnrecognized, 3226 "check")) { 3227 return JNI_EINVAL; 3228 } 3229 } else if (match_option(option, "vfprintf", &tail)) { 3230 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3231 } else if (match_option(option, "exit", &tail)) { 3232 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3233 } else if (match_option(option, "abort", &tail)) { 3234 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3235 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3236 // The last option must always win. 3237 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3238 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3239 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3240 // The last option must always win. 3241 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3242 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3243 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3244 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3245 jio_fprintf(defaultStream::error_stream(), 3246 "Please use CMSClassUnloadingEnabled in place of " 3247 "CMSPermGenSweepingEnabled in the future\n"); 3248 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3249 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3250 jio_fprintf(defaultStream::error_stream(), 3251 "Please use -XX:+UseGCOverheadLimit in place of " 3252 "-XX:+UseGCTimeLimit in the future\n"); 3253 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3254 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3255 jio_fprintf(defaultStream::error_stream(), 3256 "Please use -XX:-UseGCOverheadLimit in place of " 3257 "-XX:-UseGCTimeLimit in the future\n"); 3258 // The TLE options are for compatibility with 1.3 and will be 3259 // removed without notice in a future release. These options 3260 // are not to be documented. 3261 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3262 // No longer used. 3263 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3264 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3265 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3266 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3267 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3268 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3269 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3270 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3271 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3272 // No longer used. 3273 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3274 julong long_tlab_size = 0; 3275 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3276 if (errcode != arg_in_range) { 3277 jio_fprintf(defaultStream::error_stream(), 3278 "Invalid TLAB size: %s\n", option->optionString); 3279 describe_range_error(errcode); 3280 return JNI_EINVAL; 3281 } 3282 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3283 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3284 // No longer used. 3285 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3286 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3287 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3288 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3289 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3290 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3291 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3292 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3293 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3294 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3295 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3296 #if defined(DTRACE_ENABLED) 3297 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3298 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3299 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3300 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3301 #else // defined(DTRACE_ENABLED) 3302 jio_fprintf(defaultStream::error_stream(), 3303 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3304 return JNI_EINVAL; 3305 #endif // defined(DTRACE_ENABLED) 3306 #ifdef ASSERT 3307 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3308 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3309 // disable scavenge before parallel mark-compact 3310 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3311 #endif 3312 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3313 julong cms_blocks_to_claim = (julong)atol(tail); 3314 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3315 jio_fprintf(defaultStream::error_stream(), 3316 "Please use -XX:OldPLABSize in place of " 3317 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3318 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3319 julong cms_blocks_to_claim = (julong)atol(tail); 3320 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3321 jio_fprintf(defaultStream::error_stream(), 3322 "Please use -XX:OldPLABSize in place of " 3323 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3324 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3325 julong old_plab_size = 0; 3326 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3327 if (errcode != arg_in_range) { 3328 jio_fprintf(defaultStream::error_stream(), 3329 "Invalid old PLAB size: %s\n", option->optionString); 3330 describe_range_error(errcode); 3331 return JNI_EINVAL; 3332 } 3333 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3334 jio_fprintf(defaultStream::error_stream(), 3335 "Please use -XX:OldPLABSize in place of " 3336 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3337 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3338 julong young_plab_size = 0; 3339 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3340 if (errcode != arg_in_range) { 3341 jio_fprintf(defaultStream::error_stream(), 3342 "Invalid young PLAB size: %s\n", option->optionString); 3343 describe_range_error(errcode); 3344 return JNI_EINVAL; 3345 } 3346 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3347 jio_fprintf(defaultStream::error_stream(), 3348 "Please use -XX:YoungPLABSize in place of " 3349 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3350 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3351 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3352 julong stack_size = 0; 3353 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3354 if (errcode != arg_in_range) { 3355 jio_fprintf(defaultStream::error_stream(), 3356 "Invalid mark stack size: %s\n", option->optionString); 3357 describe_range_error(errcode); 3358 return JNI_EINVAL; 3359 } 3360 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3361 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3362 julong max_stack_size = 0; 3363 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3364 if (errcode != arg_in_range) { 3365 jio_fprintf(defaultStream::error_stream(), 3366 "Invalid maximum mark stack size: %s\n", 3367 option->optionString); 3368 describe_range_error(errcode); 3369 return JNI_EINVAL; 3370 } 3371 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3372 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3373 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3374 uintx conc_threads = 0; 3375 if (!parse_uintx(tail, &conc_threads, 1)) { 3376 jio_fprintf(defaultStream::error_stream(), 3377 "Invalid concurrent threads: %s\n", option->optionString); 3378 return JNI_EINVAL; 3379 } 3380 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3381 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3382 julong max_direct_memory_size = 0; 3383 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3384 if (errcode != arg_in_range) { 3385 jio_fprintf(defaultStream::error_stream(), 3386 "Invalid maximum direct memory size: %s\n", 3387 option->optionString); 3388 describe_range_error(errcode); 3389 return JNI_EINVAL; 3390 } 3391 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3392 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3393 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3394 // away and will cause VM initialization failures! 3395 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3396 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3397 #if !INCLUDE_MANAGEMENT 3398 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3399 jio_fprintf(defaultStream::error_stream(), 3400 "ManagementServer is not supported in this VM.\n"); 3401 return JNI_ERR; 3402 #endif // INCLUDE_MANAGEMENT 3403 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3404 // Skip -XX:Flags= since that case has already been handled 3405 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3406 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3407 return JNI_EINVAL; 3408 } 3409 } 3410 // Unknown option 3411 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3412 return JNI_ERR; 3413 } 3414 } 3415 3416 // PrintSharedArchiveAndExit will turn on 3417 // -Xshare:on 3418 // -XX:+TraceClassPaths 3419 if (PrintSharedArchiveAndExit) { 3420 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3421 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3422 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3423 } 3424 3425 // Change the default value for flags which have different default values 3426 // when working with older JDKs. 3427 #ifdef LINUX 3428 if (JDK_Version::current().compare_major(6) <= 0 && 3429 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3430 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3431 } 3432 #endif // LINUX 3433 fix_appclasspath(); 3434 return JNI_OK; 3435 } 3436 3437 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3438 // 3439 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3440 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3441 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3442 // path is treated as the current directory. 3443 // 3444 // This causes problems with CDS, which requires that all directories specified in the classpath 3445 // must be empty. In most cases, applications do NOT want to load classes from the current 3446 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3447 // scripts compatible with CDS. 3448 void Arguments::fix_appclasspath() { 3449 if (IgnoreEmptyClassPaths) { 3450 const char separator = *os::path_separator(); 3451 const char* src = _java_class_path->value(); 3452 3453 // skip over all the leading empty paths 3454 while (*src == separator) { 3455 src ++; 3456 } 3457 3458 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3459 strncpy(copy, src, strlen(src) + 1); 3460 3461 // trim all trailing empty paths 3462 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3463 *tail = '\0'; 3464 } 3465 3466 char from[3] = {separator, separator, '\0'}; 3467 char to [2] = {separator, '\0'}; 3468 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3469 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3470 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3471 } 3472 3473 _java_class_path->set_value(copy); 3474 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3475 } 3476 3477 if (!PrintSharedArchiveAndExit) { 3478 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value()); 3479 } 3480 } 3481 3482 static bool has_jar_files(const char* directory) { 3483 DIR* dir = os::opendir(directory); 3484 if (dir == NULL) return false; 3485 3486 struct dirent *entry; 3487 bool hasJarFile = false; 3488 while (!hasJarFile && (entry = os::readdir(dir)) != NULL) { 3489 const char* name = entry->d_name; 3490 const char* ext = name + strlen(name) - 4; 3491 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3492 } 3493 os::closedir(dir); 3494 return hasJarFile ; 3495 } 3496 3497 // returns the number of directories in the given path containing JAR files 3498 // If the skip argument is not NULL, it will skip that directory 3499 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) { 3500 const char separator = *os::path_separator(); 3501 const char* const end = path + strlen(path); 3502 int nonEmptyDirs = 0; 3503 while (path < end) { 3504 const char* tmp_end = strchr(path, separator); 3505 if (tmp_end == NULL) { 3506 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) { 3507 nonEmptyDirs++; 3508 jio_fprintf(defaultStream::output_stream(), 3509 "Non-empty %s directory: %s\n", type, path); 3510 } 3511 path = end; 3512 } else { 3513 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3514 memcpy(dirpath, path, tmp_end - path); 3515 dirpath[tmp_end - path] = '\0'; 3516 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) { 3517 nonEmptyDirs++; 3518 jio_fprintf(defaultStream::output_stream(), 3519 "Non-empty %s directory: %s\n", type, dirpath); 3520 } 3521 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 3522 path = tmp_end + 1; 3523 } 3524 } 3525 return nonEmptyDirs; 3526 } 3527 3528 // Returns true if endorsed standards override mechanism and extension mechanism 3529 // are not used. 3530 static bool check_endorsed_and_ext_dirs() { 3531 if (!CheckEndorsedAndExtDirs) 3532 return true; 3533 3534 char endorsedDir[JVM_MAXPATHLEN]; 3535 char extDir[JVM_MAXPATHLEN]; 3536 const char* fileSep = os::file_separator(); 3537 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed", 3538 Arguments::get_java_home(), fileSep, fileSep); 3539 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext", 3540 Arguments::get_java_home(), fileSep, fileSep); 3541 3542 // check endorsed directory 3543 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL); 3544 3545 // check the extension directories but skip the default lib/ext directory 3546 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir); 3547 3548 // List of JAR files installed in the default lib/ext directory. 3549 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed 3550 static const char* jdk_ext_jars[] = { 3551 "access-bridge-32.jar", 3552 "access-bridge-64.jar", 3553 "access-bridge.jar", 3554 "cldrdata.jar", 3555 "dnsns.jar", 3556 "jaccess.jar", 3557 "jfxrt.jar", 3558 "localedata.jar", 3559 "nashorn.jar", 3560 "sunec.jar", 3561 "sunjce_provider.jar", 3562 "sunmscapi.jar", 3563 "sunpkcs11.jar", 3564 "ucrypto.jar", 3565 "zipfs.jar", 3566 NULL 3567 }; 3568 3569 // check if the default lib/ext directory has any non-JDK jar files; if so, error 3570 DIR* dir = os::opendir(extDir); 3571 if (dir != NULL) { 3572 int num_ext_jars = 0; 3573 struct dirent *entry; 3574 while ((entry = os::readdir(dir)) != NULL) { 3575 const char* name = entry->d_name; 3576 const char* ext = name + strlen(name) - 4; 3577 if (ext > name && (os::file_name_strcmp(ext, ".jar") == 0)) { 3578 bool is_jdk_jar = false; 3579 const char* jarfile = NULL; 3580 for (int i=0; (jarfile = jdk_ext_jars[i]) != NULL; i++) { 3581 if (os::file_name_strcmp(name, jarfile) == 0) { 3582 is_jdk_jar = true; 3583 break; 3584 } 3585 } 3586 if (!is_jdk_jar) { 3587 jio_fprintf(defaultStream::output_stream(), 3588 "%s installed in <JAVA_HOME>/lib/ext\n", name); 3589 num_ext_jars++; 3590 } 3591 } 3592 } 3593 os::closedir(dir); 3594 if (num_ext_jars > 0) { 3595 nonEmptyDirs += 1; 3596 } 3597 } 3598 3599 // check if the default lib/endorsed directory exists; if so, error 3600 dir = os::opendir(endorsedDir); 3601 if (dir != NULL) { 3602 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n"); 3603 os::closedir(dir); 3604 nonEmptyDirs += 1; 3605 } 3606 3607 if (nonEmptyDirs > 0) { 3608 jio_fprintf(defaultStream::output_stream(), 3609 "Endorsed standards override mechanism and extension mechanism " 3610 "will not be supported in a future release.\n" 3611 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n"); 3612 return false; 3613 } 3614 3615 return true; 3616 } 3617 3618 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3619 // This must be done after all -D arguments have been processed. 3620 scp_p->expand_endorsed(); 3621 3622 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3623 // Assemble the bootclasspath elements into the final path. 3624 Arguments::set_sysclasspath(scp_p->combined_path()); 3625 } 3626 3627 if (!check_endorsed_and_ext_dirs()) { 3628 return JNI_ERR; 3629 } 3630 3631 // This must be done after all arguments have been processed 3632 // and the container support has been initialized since AggressiveHeap 3633 // relies on the amount of total memory available. 3634 if (AggressiveHeap) { 3635 jint result = set_aggressive_heap_flags(); 3636 if (result != JNI_OK) { 3637 return result; 3638 } 3639 } 3640 // This must be done after all arguments have been processed. 3641 // java_compiler() true means set to "NONE" or empty. 3642 if (java_compiler() && !xdebug_mode()) { 3643 // For backwards compatibility, we switch to interpreted mode if 3644 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3645 // not specified. 3646 set_mode_flags(_int); 3647 } 3648 if (CompileThreshold == 0) { 3649 set_mode_flags(_int); 3650 } 3651 3652 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3653 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3654 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3655 } 3656 3657 #ifndef COMPILER2 3658 // Don't degrade server performance for footprint 3659 if (FLAG_IS_DEFAULT(UseLargePages) && 3660 MaxHeapSize < LargePageHeapSizeThreshold) { 3661 // No need for large granularity pages w/small heaps. 3662 // Note that large pages are enabled/disabled for both the 3663 // Java heap and the code cache. 3664 FLAG_SET_DEFAULT(UseLargePages, false); 3665 } 3666 3667 #else 3668 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3669 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3670 } 3671 #endif 3672 3673 #ifndef TIERED 3674 // Tiered compilation is undefined. 3675 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3676 #endif 3677 3678 // If we are running in a headless jre, force java.awt.headless property 3679 // to be true unless the property has already been set. 3680 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3681 if (os::is_headless_jre()) { 3682 const char* headless = Arguments::get_property("java.awt.headless"); 3683 if (headless == NULL) { 3684 char envbuffer[128]; 3685 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3686 if (!add_property("java.awt.headless=true")) { 3687 return JNI_ENOMEM; 3688 } 3689 } else { 3690 char buffer[256]; 3691 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer); 3692 if (!add_property(buffer)) { 3693 return JNI_ENOMEM; 3694 } 3695 } 3696 } 3697 } 3698 3699 if (!check_vm_args_consistency()) { 3700 return JNI_ERR; 3701 } 3702 3703 return JNI_OK; 3704 } 3705 3706 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3707 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3708 scp_assembly_required_p); 3709 } 3710 3711 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3712 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3713 scp_assembly_required_p); 3714 } 3715 3716 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3717 const int N_MAX_OPTIONS = 64; 3718 const int OPTION_BUFFER_SIZE = 1024; 3719 char buffer[OPTION_BUFFER_SIZE]; 3720 3721 // The variable will be ignored if it exceeds the length of the buffer. 3722 // Don't check this variable if user has special privileges 3723 // (e.g. unix su command). 3724 if (os::getenv(name, buffer, sizeof(buffer)) && 3725 !os::have_special_privileges()) { 3726 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3727 jio_fprintf(defaultStream::error_stream(), 3728 "Picked up %s: %s\n", name, buffer); 3729 char* rd = buffer; // pointer to the input string (rd) 3730 int i; 3731 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3732 while (isspace(*rd)) rd++; // skip whitespace 3733 if (*rd == 0) break; // we re done when the input string is read completely 3734 3735 // The output, option string, overwrites the input string. 3736 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3737 // input string (rd). 3738 char* wrt = rd; 3739 3740 options[i++].optionString = wrt; // Fill in option 3741 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3742 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3743 int quote = *rd; // matching quote to look for 3744 rd++; // don't copy open quote 3745 while (*rd != quote) { // include everything (even spaces) up until quote 3746 if (*rd == 0) { // string termination means unmatched string 3747 jio_fprintf(defaultStream::error_stream(), 3748 "Unmatched quote in %s\n", name); 3749 return JNI_ERR; 3750 } 3751 *wrt++ = *rd++; // copy to option string 3752 } 3753 rd++; // don't copy close quote 3754 } else { 3755 *wrt++ = *rd++; // copy to option string 3756 } 3757 } 3758 // Need to check if we're done before writing a NULL, 3759 // because the write could be to the byte that rd is pointing to. 3760 if (*rd++ == 0) { 3761 *wrt = 0; 3762 break; 3763 } 3764 *wrt = 0; // Zero terminate option 3765 } 3766 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3767 JavaVMInitArgs vm_args; 3768 vm_args.version = JNI_VERSION_1_2; 3769 vm_args.options = options; 3770 vm_args.nOptions = i; 3771 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3772 3773 if (PrintVMOptions) { 3774 const char* tail; 3775 for (int i = 0; i < vm_args.nOptions; i++) { 3776 const JavaVMOption *option = vm_args.options + i; 3777 if (match_option(option, "-XX:", &tail)) { 3778 logOption(tail); 3779 } 3780 } 3781 } 3782 3783 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3784 } 3785 return JNI_OK; 3786 } 3787 3788 void Arguments::set_shared_spaces_flags() { 3789 if (DumpSharedSpaces) { 3790 if (FailOverToOldVerifier) { 3791 // Don't fall back to the old verifier on verification failure. If a 3792 // class fails verification with the split verifier, it might fail the 3793 // CDS runtime verifier constraint check. In that case, we don't want 3794 // to share the class. We only archive classes that pass the split verifier. 3795 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3796 } 3797 3798 if (RequireSharedSpaces) { 3799 warning("cannot dump shared archive while using shared archive"); 3800 } 3801 UseSharedSpaces = false; 3802 #ifdef _LP64 3803 if (!UseCompressedOops || !UseCompressedClassPointers) { 3804 vm_exit_during_initialization( 3805 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3806 } 3807 } else { 3808 if (!UseCompressedOops || !UseCompressedClassPointers) { 3809 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3810 } 3811 #endif 3812 } 3813 } 3814 3815 #if !INCLUDE_ALL_GCS 3816 static void force_serial_gc() { 3817 FLAG_SET_DEFAULT(UseSerialGC, true); 3818 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3819 UNSUPPORTED_GC_OPTION(UseG1GC); 3820 UNSUPPORTED_GC_OPTION(UseParallelGC); 3821 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3822 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3823 UNSUPPORTED_GC_OPTION(UseParNewGC); 3824 } 3825 #endif // INCLUDE_ALL_GCS 3826 3827 // Sharing support 3828 // Construct the path to the archive 3829 static char* get_shared_archive_path() { 3830 char *shared_archive_path; 3831 if (SharedArchiveFile == NULL) { 3832 char jvm_path[JVM_MAXPATHLEN]; 3833 os::jvm_path(jvm_path, sizeof(jvm_path)); 3834 char *end = strrchr(jvm_path, *os::file_separator()); 3835 if (end != NULL) *end = '\0'; 3836 size_t jvm_path_len = strlen(jvm_path); 3837 size_t file_sep_len = strlen(os::file_separator()); 3838 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3839 file_sep_len + 20, mtInternal); 3840 if (shared_archive_path != NULL) { 3841 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3842 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3843 strncat(shared_archive_path, "classes.jsa", 11); 3844 } 3845 } else { 3846 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3847 if (shared_archive_path != NULL) { 3848 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3849 } 3850 } 3851 return shared_archive_path; 3852 } 3853 3854 #ifndef PRODUCT 3855 // Determine whether LogVMOutput should be implicitly turned on. 3856 static bool use_vm_log() { 3857 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3858 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3859 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3860 PrintAssembly || TraceDeoptimization || TraceDependencies || 3861 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3862 return true; 3863 } 3864 3865 #ifdef COMPILER1 3866 if (PrintC1Statistics) { 3867 return true; 3868 } 3869 #endif // COMPILER1 3870 3871 #ifdef COMPILER2 3872 if (PrintOptoAssembly || PrintOptoStatistics) { 3873 return true; 3874 } 3875 #endif // COMPILER2 3876 3877 return false; 3878 } 3879 #endif // PRODUCT 3880 3881 // Parse entry point called from JNI_CreateJavaVM 3882 3883 jint Arguments::parse(const JavaVMInitArgs* args) { 3884 3885 // Remaining part of option string 3886 const char* tail; 3887 3888 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3889 const char* hotspotrc = ".hotspotrc"; 3890 bool settings_file_specified = false; 3891 bool needs_hotspotrc_warning = false; 3892 3893 ArgumentsExt::process_options(args); 3894 3895 const char* flags_file; 3896 int index; 3897 for (index = 0; index < args->nOptions; index++) { 3898 const JavaVMOption *option = args->options + index; 3899 if (match_option(option, "-XX:Flags=", &tail)) { 3900 flags_file = tail; 3901 settings_file_specified = true; 3902 } 3903 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3904 PrintVMOptions = true; 3905 } 3906 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3907 PrintVMOptions = false; 3908 } 3909 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3910 IgnoreUnrecognizedVMOptions = true; 3911 } 3912 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3913 IgnoreUnrecognizedVMOptions = false; 3914 } 3915 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3916 CommandLineFlags::printFlags(tty, false); 3917 vm_exit(0); 3918 } 3919 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3920 #if INCLUDE_NMT 3921 // The launcher did not setup nmt environment variable properly. 3922 if (!MemTracker::check_launcher_nmt_support(tail)) { 3923 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3924 } 3925 3926 // Verify if nmt option is valid. 3927 if (MemTracker::verify_nmt_option()) { 3928 // Late initialization, still in single-threaded mode. 3929 if (MemTracker::tracking_level() >= NMT_summary) { 3930 MemTracker::init(); 3931 } 3932 } else { 3933 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3934 } 3935 #else 3936 jio_fprintf(defaultStream::error_stream(), 3937 "Native Memory Tracking is not supported in this VM\n"); 3938 return JNI_ERR; 3939 #endif 3940 } 3941 3942 3943 #ifndef PRODUCT 3944 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3945 CommandLineFlags::printFlags(tty, true); 3946 vm_exit(0); 3947 } 3948 #endif 3949 } 3950 3951 if (IgnoreUnrecognizedVMOptions) { 3952 // uncast const to modify the flag args->ignoreUnrecognized 3953 *(jboolean*)(&args->ignoreUnrecognized) = true; 3954 } 3955 3956 // Parse specified settings file 3957 if (settings_file_specified) { 3958 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3959 return JNI_EINVAL; 3960 } 3961 } else { 3962 #ifdef ASSERT 3963 // Parse default .hotspotrc settings file 3964 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3965 return JNI_EINVAL; 3966 } 3967 #else 3968 struct stat buf; 3969 if (os::stat(hotspotrc, &buf) == 0) { 3970 needs_hotspotrc_warning = true; 3971 } 3972 #endif 3973 } 3974 3975 if (PrintVMOptions) { 3976 for (index = 0; index < args->nOptions; index++) { 3977 const JavaVMOption *option = args->options + index; 3978 if (match_option(option, "-XX:", &tail)) { 3979 logOption(tail); 3980 } 3981 } 3982 } 3983 3984 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3985 jint result = parse_vm_init_args(args); 3986 if (result != JNI_OK) { 3987 return result; 3988 } 3989 3990 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3991 SharedArchivePath = get_shared_archive_path(); 3992 if (SharedArchivePath == NULL) { 3993 return JNI_ENOMEM; 3994 } 3995 3996 // Set up VerifySharedSpaces 3997 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3998 VerifySharedSpaces = true; 3999 } 4000 4001 // Delay warning until here so that we've had a chance to process 4002 // the -XX:-PrintWarnings flag 4003 if (needs_hotspotrc_warning) { 4004 warning("%s file is present but has been ignored. " 4005 "Run with -XX:Flags=%s to load the file.", 4006 hotspotrc, hotspotrc); 4007 } 4008 4009 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 4010 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 4011 #endif 4012 4013 #if INCLUDE_ALL_GCS 4014 #if (defined JAVASE_EMBEDDED || defined ARM) 4015 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 4016 #endif 4017 #endif 4018 4019 #ifndef PRODUCT 4020 if (TraceBytecodesAt != 0) { 4021 TraceBytecodes = true; 4022 } 4023 if (CountCompiledCalls) { 4024 if (UseCounterDecay) { 4025 warning("UseCounterDecay disabled because CountCalls is set"); 4026 UseCounterDecay = false; 4027 } 4028 } 4029 #endif // PRODUCT 4030 4031 // JSR 292 is not supported before 1.7 4032 if (!JDK_Version::is_gte_jdk17x_version()) { 4033 if (EnableInvokeDynamic) { 4034 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 4035 warning("JSR 292 is not supported before 1.7. Disabling support."); 4036 } 4037 EnableInvokeDynamic = false; 4038 } 4039 } 4040 4041 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 4042 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4043 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 4044 } 4045 ScavengeRootsInCode = 1; 4046 } 4047 4048 if (PrintGCDetails) { 4049 // Turn on -verbose:gc options as well 4050 PrintGC = true; 4051 } 4052 4053 if (!JDK_Version::is_gte_jdk18x_version()) { 4054 // To avoid changing the log format for 7 updates this flag is only 4055 // true by default in JDK8 and above. 4056 if (FLAG_IS_DEFAULT(PrintGCCause)) { 4057 FLAG_SET_DEFAULT(PrintGCCause, false); 4058 } 4059 } 4060 4061 // Set object alignment values. 4062 set_object_alignment(); 4063 4064 #if !INCLUDE_ALL_GCS 4065 force_serial_gc(); 4066 #endif // INCLUDE_ALL_GCS 4067 #if !INCLUDE_CDS 4068 if (DumpSharedSpaces || RequireSharedSpaces) { 4069 jio_fprintf(defaultStream::error_stream(), 4070 "Shared spaces are not supported in this VM\n"); 4071 return JNI_ERR; 4072 } 4073 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4074 warning("Shared spaces are not supported in this VM"); 4075 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4076 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4077 } 4078 no_shared_spaces("CDS Disabled"); 4079 #endif // INCLUDE_CDS 4080 4081 return JNI_OK; 4082 } 4083 4084 jint Arguments::apply_ergo() { 4085 4086 // Set flags based on ergonomics. 4087 set_ergonomics_flags(); 4088 4089 set_shared_spaces_flags(); 4090 4091 #if defined(SPARC) 4092 // BIS instructions require 'membar' instruction regardless of the number 4093 // of CPUs because in virtualized/container environments which might use only 1 4094 // CPU, BIS instructions may produce incorrect results. 4095 4096 if (FLAG_IS_DEFAULT(AssumeMP)) { 4097 FLAG_SET_DEFAULT(AssumeMP, true); 4098 } 4099 #endif 4100 4101 // Check the GC selections again. 4102 if (!check_gc_consistency()) { 4103 return JNI_EINVAL; 4104 } 4105 4106 if (TieredCompilation) { 4107 set_tiered_flags(); 4108 } else { 4109 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 4110 if (CompilationPolicyChoice >= 2) { 4111 vm_exit_during_initialization( 4112 "Incompatible compilation policy selected", NULL); 4113 } 4114 } 4115 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 4116 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 4117 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 4118 } 4119 4120 4121 // Set heap size based on available physical memory 4122 set_heap_size(); 4123 4124 ArgumentsExt::set_gc_specific_flags(); 4125 4126 // Initialize Metaspace flags and alignments. 4127 Metaspace::ergo_initialize(); 4128 4129 // Set bytecode rewriting flags 4130 set_bytecode_flags(); 4131 4132 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 4133 set_aggressive_opts_flags(); 4134 4135 // Turn off biased locking for locking debug mode flags, 4136 // which are subtlely different from each other but neither works with 4137 // biased locking. 4138 if (UseHeavyMonitors 4139 #ifdef COMPILER1 4140 || !UseFastLocking 4141 #endif // COMPILER1 4142 ) { 4143 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4144 // flag set to true on command line; warn the user that they 4145 // can't enable biased locking here 4146 warning("Biased Locking is not supported with locking debug flags" 4147 "; ignoring UseBiasedLocking flag." ); 4148 } 4149 UseBiasedLocking = false; 4150 } 4151 4152 #ifdef ZERO 4153 // Clear flags not supported on zero. 4154 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4155 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4156 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4157 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4158 #endif // CC_INTERP 4159 4160 #ifdef COMPILER2 4161 if (!EliminateLocks) { 4162 EliminateNestedLocks = false; 4163 } 4164 if (!Inline) { 4165 IncrementalInline = false; 4166 } 4167 #ifndef PRODUCT 4168 if (!IncrementalInline) { 4169 AlwaysIncrementalInline = false; 4170 } 4171 #endif 4172 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 4173 // incremental inlining: bump MaxNodeLimit 4174 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 4175 } 4176 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4177 // nothing to use the profiling, turn if off 4178 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4179 } 4180 #endif 4181 4182 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4183 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4184 DebugNonSafepoints = true; 4185 } 4186 4187 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4188 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4189 } 4190 4191 if (UseOnStackReplacement && !UseLoopCounter) { 4192 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4193 FLAG_SET_DEFAULT(UseLoopCounter, true); 4194 } 4195 4196 #ifndef PRODUCT 4197 if (CompileTheWorld) { 4198 // Force NmethodSweeper to sweep whole CodeCache each time. 4199 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 4200 NmethodSweepFraction = 1; 4201 } 4202 } 4203 4204 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4205 if (use_vm_log()) { 4206 LogVMOutput = true; 4207 } 4208 } 4209 #endif // PRODUCT 4210 4211 if (PrintCommandLineFlags) { 4212 CommandLineFlags::printSetFlags(tty); 4213 } 4214 4215 // Apply CPU specific policy for the BiasedLocking 4216 if (UseBiasedLocking) { 4217 if (!VM_Version::use_biased_locking() && 4218 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4219 UseBiasedLocking = false; 4220 } 4221 } 4222 #ifdef COMPILER2 4223 if (!UseBiasedLocking || EmitSync != 0) { 4224 UseOptoBiasInlining = false; 4225 } 4226 #endif 4227 4228 // set PauseAtExit if the gamma launcher was used and a debugger is attached 4229 // but only if not already set on the commandline 4230 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 4231 bool set = false; 4232 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 4233 if (!set) { 4234 FLAG_SET_DEFAULT(PauseAtExit, true); 4235 } 4236 } 4237 4238 return JNI_OK; 4239 } 4240 4241 jint Arguments::adjust_after_os() { 4242 if (UseNUMA) { 4243 if (UseParallelGC || UseParallelOldGC) { 4244 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4245 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4246 } 4247 } 4248 // UseNUMAInterleaving is set to ON for all collectors and 4249 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4250 // such as the parallel collector for Linux and Solaris will 4251 // interleave old gen and survivor spaces on top of NUMA 4252 // allocation policy for the eden space. 4253 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4254 // all platforms and ParallelGC on Windows will interleave all 4255 // of the heap spaces across NUMA nodes. 4256 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4257 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4258 } 4259 } 4260 return JNI_OK; 4261 } 4262 4263 int Arguments::PropertyList_count(SystemProperty* pl) { 4264 int count = 0; 4265 while(pl != NULL) { 4266 count++; 4267 pl = pl->next(); 4268 } 4269 return count; 4270 } 4271 4272 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4273 assert(key != NULL, "just checking"); 4274 SystemProperty* prop; 4275 for (prop = pl; prop != NULL; prop = prop->next()) { 4276 if (strcmp(key, prop->key()) == 0) return prop->value(); 4277 } 4278 return NULL; 4279 } 4280 4281 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4282 int count = 0; 4283 const char* ret_val = NULL; 4284 4285 while(pl != NULL) { 4286 if(count >= index) { 4287 ret_val = pl->key(); 4288 break; 4289 } 4290 count++; 4291 pl = pl->next(); 4292 } 4293 4294 return ret_val; 4295 } 4296 4297 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4298 int count = 0; 4299 char* ret_val = NULL; 4300 4301 while(pl != NULL) { 4302 if(count >= index) { 4303 ret_val = pl->value(); 4304 break; 4305 } 4306 count++; 4307 pl = pl->next(); 4308 } 4309 4310 return ret_val; 4311 } 4312 4313 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4314 SystemProperty* p = *plist; 4315 if (p == NULL) { 4316 *plist = new_p; 4317 } else { 4318 while (p->next() != NULL) { 4319 p = p->next(); 4320 } 4321 p->set_next(new_p); 4322 } 4323 } 4324 4325 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4326 if (plist == NULL) 4327 return; 4328 4329 SystemProperty* new_p = new SystemProperty(k, v, true); 4330 PropertyList_add(plist, new_p); 4331 } 4332 4333 // This add maintains unique property key in the list. 4334 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4335 if (plist == NULL) 4336 return; 4337 4338 // If property key exist then update with new value. 4339 SystemProperty* prop; 4340 for (prop = *plist; prop != NULL; prop = prop->next()) { 4341 if (strcmp(k, prop->key()) == 0) { 4342 if (append) { 4343 prop->append_value(v); 4344 } else { 4345 prop->set_value(v); 4346 } 4347 return; 4348 } 4349 } 4350 4351 PropertyList_add(plist, k, v); 4352 } 4353 4354 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4355 // Returns true if all of the source pointed by src has been copied over to 4356 // the destination buffer pointed by buf. Otherwise, returns false. 4357 // Notes: 4358 // 1. If the length (buflen) of the destination buffer excluding the 4359 // NULL terminator character is not long enough for holding the expanded 4360 // pid characters, it also returns false instead of returning the partially 4361 // expanded one. 4362 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4363 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4364 char* buf, size_t buflen) { 4365 const char* p = src; 4366 char* b = buf; 4367 const char* src_end = &src[srclen]; 4368 char* buf_end = &buf[buflen - 1]; 4369 4370 while (p < src_end && b < buf_end) { 4371 if (*p == '%') { 4372 switch (*(++p)) { 4373 case '%': // "%%" ==> "%" 4374 *b++ = *p++; 4375 break; 4376 case 'p': { // "%p" ==> current process id 4377 // buf_end points to the character before the last character so 4378 // that we could write '\0' to the end of the buffer. 4379 size_t buf_sz = buf_end - b + 1; 4380 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4381 4382 // if jio_snprintf fails or the buffer is not long enough to hold 4383 // the expanded pid, returns false. 4384 if (ret < 0 || ret >= (int)buf_sz) { 4385 return false; 4386 } else { 4387 b += ret; 4388 assert(*b == '\0', "fail in copy_expand_pid"); 4389 if (p == src_end && b == buf_end + 1) { 4390 // reach the end of the buffer. 4391 return true; 4392 } 4393 } 4394 p++; 4395 break; 4396 } 4397 default : 4398 *b++ = '%'; 4399 } 4400 } else { 4401 *b++ = *p++; 4402 } 4403 } 4404 *b = '\0'; 4405 return (p == src_end); // return false if not all of the source was copied 4406 }