1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/symbolTable.hpp" 29 #include "compiler/compilerOracle.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/cardTableRS.hpp" 32 #include "memory/genCollectedHeap.hpp" 33 #include "memory/referenceProcessor.hpp" 34 #include "memory/universe.inline.hpp" 35 #include "oops/oop.inline.hpp" 36 #include "prims/jvmtiExport.hpp" 37 #include "runtime/arguments.hpp" 38 #include "runtime/arguments_ext.hpp" 39 #include "runtime/globals_extension.hpp" 40 #include "runtime/java.hpp" 41 #include "services/management.hpp" 42 #include "services/memTracker.hpp" 43 #include "utilities/defaultStream.hpp" 44 #include "utilities/macros.hpp" 45 #include "utilities/stringUtils.hpp" 46 #include "utilities/taskqueue.hpp" 47 #ifdef TARGET_OS_FAMILY_linux 48 # include "os_linux.inline.hpp" 49 #endif 50 #ifdef TARGET_OS_FAMILY_solaris 51 # include "os_solaris.inline.hpp" 52 #endif 53 #ifdef TARGET_OS_FAMILY_windows 54 # include "os_windows.inline.hpp" 55 #endif 56 #ifdef TARGET_OS_FAMILY_aix 57 # include "os_aix.inline.hpp" 58 #endif 59 #ifdef TARGET_OS_FAMILY_bsd 60 # include "os_bsd.inline.hpp" 61 #endif 62 #if INCLUDE_ALL_GCS 63 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 64 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 65 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 66 #endif // INCLUDE_ALL_GCS 67 68 // Note: This is a special bug reporting site for the JVM 69 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 70 #define DEFAULT_JAVA_LAUNCHER "generic" 71 72 // Disable options not supported in this release, with a warning if they 73 // were explicitly requested on the command-line 74 #define UNSUPPORTED_OPTION(opt, description) \ 75 do { \ 76 if (opt) { \ 77 if (FLAG_IS_CMDLINE(opt)) { \ 78 warning(description " is disabled in this release."); \ 79 } \ 80 FLAG_SET_DEFAULT(opt, false); \ 81 } \ 82 } while(0) 83 84 #define UNSUPPORTED_GC_OPTION(gc) \ 85 do { \ 86 if (gc) { \ 87 if (FLAG_IS_CMDLINE(gc)) { \ 88 warning(#gc " is not supported in this VM. Using Serial GC."); \ 89 } \ 90 FLAG_SET_DEFAULT(gc, false); \ 91 } \ 92 } while(0) 93 94 char** Arguments::_jvm_flags_array = NULL; 95 int Arguments::_num_jvm_flags = 0; 96 char** Arguments::_jvm_args_array = NULL; 97 int Arguments::_num_jvm_args = 0; 98 char* Arguments::_java_command = NULL; 99 SystemProperty* Arguments::_system_properties = NULL; 100 const char* Arguments::_gc_log_filename = NULL; 101 bool Arguments::_has_profile = false; 102 size_t Arguments::_conservative_max_heap_alignment = 0; 103 uintx Arguments::_min_heap_size = 0; 104 uintx Arguments::_min_heap_free_ratio = 0; 105 uintx Arguments::_max_heap_free_ratio = 0; 106 Arguments::Mode Arguments::_mode = _mixed; 107 bool Arguments::_java_compiler = false; 108 bool Arguments::_xdebug_mode = false; 109 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 110 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 111 int Arguments::_sun_java_launcher_pid = -1; 112 bool Arguments::_created_by_gamma_launcher = false; 113 114 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 115 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 116 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 117 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 118 bool Arguments::_ClipInlining = ClipInlining; 119 120 char* Arguments::SharedArchivePath = NULL; 121 122 AgentLibraryList Arguments::_libraryList; 123 AgentLibraryList Arguments::_agentList; 124 125 abort_hook_t Arguments::_abort_hook = NULL; 126 exit_hook_t Arguments::_exit_hook = NULL; 127 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 128 129 130 SystemProperty *Arguments::_java_ext_dirs = NULL; 131 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 132 SystemProperty *Arguments::_sun_boot_library_path = NULL; 133 SystemProperty *Arguments::_java_library_path = NULL; 134 SystemProperty *Arguments::_java_home = NULL; 135 SystemProperty *Arguments::_java_class_path = NULL; 136 SystemProperty *Arguments::_sun_boot_class_path = NULL; 137 138 char* Arguments::_meta_index_path = NULL; 139 char* Arguments::_meta_index_dir = NULL; 140 141 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 142 143 static bool match_option(const JavaVMOption *option, const char* name, 144 const char** tail) { 145 int len = (int)strlen(name); 146 if (strncmp(option->optionString, name, len) == 0) { 147 *tail = option->optionString + len; 148 return true; 149 } else { 150 return false; 151 } 152 } 153 154 static void logOption(const char* opt) { 155 if (PrintVMOptions) { 156 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 157 } 158 } 159 160 // Process java launcher properties. 161 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 162 // See if sun.java.launcher or sun.java.launcher.pid is defined. 163 // Must do this before setting up other system properties, 164 // as some of them may depend on launcher type. 165 for (int index = 0; index < args->nOptions; index++) { 166 const JavaVMOption* option = args->options + index; 167 const char* tail; 168 169 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 170 process_java_launcher_argument(tail, option->extraInfo); 171 continue; 172 } 173 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 174 _sun_java_launcher_pid = atoi(tail); 175 continue; 176 } 177 } 178 } 179 180 // Initialize system properties key and value. 181 void Arguments::init_system_properties() { 182 183 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 184 "Java Virtual Machine Specification", false)); 185 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 186 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 187 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 188 189 // following are JVMTI agent writeable properties. 190 // Properties values are set to NULL and they are 191 // os specific they are initialized in os::init_system_properties_values(). 192 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 193 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 194 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 195 _java_library_path = new SystemProperty("java.library.path", NULL, true); 196 _java_home = new SystemProperty("java.home", NULL, true); 197 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 198 199 _java_class_path = new SystemProperty("java.class.path", "", true); 200 201 // Add to System Property list. 202 PropertyList_add(&_system_properties, _java_ext_dirs); 203 PropertyList_add(&_system_properties, _java_endorsed_dirs); 204 PropertyList_add(&_system_properties, _sun_boot_library_path); 205 PropertyList_add(&_system_properties, _java_library_path); 206 PropertyList_add(&_system_properties, _java_home); 207 PropertyList_add(&_system_properties, _java_class_path); 208 PropertyList_add(&_system_properties, _sun_boot_class_path); 209 210 // Set OS specific system properties values 211 os::init_system_properties_values(); 212 } 213 214 215 // Update/Initialize System properties after JDK version number is known 216 void Arguments::init_version_specific_system_properties() { 217 enum { bufsz = 16 }; 218 char buffer[bufsz]; 219 const char* spec_vendor = "Sun Microsystems Inc."; 220 uint32_t spec_version = 0; 221 222 if (JDK_Version::is_gte_jdk17x_version()) { 223 spec_vendor = "Oracle Corporation"; 224 spec_version = JDK_Version::current().major_version(); 225 } 226 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 227 228 PropertyList_add(&_system_properties, 229 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.version", buffer, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 234 } 235 236 /** 237 * Provide a slightly more user-friendly way of eliminating -XX flags. 238 * When a flag is eliminated, it can be added to this list in order to 239 * continue accepting this flag on the command-line, while issuing a warning 240 * and ignoring the value. Once the JDK version reaches the 'accept_until' 241 * limit, we flatly refuse to admit the existence of the flag. This allows 242 * a flag to die correctly over JDK releases using HSX. 243 */ 244 typedef struct { 245 const char* name; 246 JDK_Version obsoleted_in; // when the flag went away 247 JDK_Version accept_until; // which version to start denying the existence 248 } ObsoleteFlag; 249 250 static ObsoleteFlag obsolete_jvm_flags[] = { 251 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 258 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 259 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 260 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 261 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 262 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 263 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 264 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 265 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 266 { "DefaultInitialRAMFraction", 267 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 268 { "UseDepthFirstScavengeOrder", 269 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 270 { "HandlePromotionFailure", 271 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 272 { "MaxLiveObjectEvacuationRatio", 273 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 274 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 275 { "UseParallelOldGCCompacting", 276 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 277 { "UseParallelDensePrefixUpdate", 278 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 279 { "UseParallelOldGCDensePrefix", 280 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 281 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 282 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 283 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 295 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 296 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 297 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 302 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 303 { "CompilationRepeat", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 304 #ifdef PRODUCT 305 { "DesiredMethodLimit", 306 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 307 #endif // PRODUCT 308 { NULL, JDK_Version(0), JDK_Version(0) } 309 }; 310 311 // Returns true if the flag is obsolete and fits into the range specified 312 // for being ignored. In the case that the flag is ignored, the 'version' 313 // value is filled in with the version number when the flag became 314 // obsolete so that that value can be displayed to the user. 315 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 316 int i = 0; 317 assert(version != NULL, "Must provide a version buffer"); 318 while (obsolete_jvm_flags[i].name != NULL) { 319 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 320 // <flag>=xxx form 321 // [-|+]<flag> form 322 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 323 ((s[0] == '+' || s[0] == '-') && 324 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 325 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 326 *version = flag_status.obsoleted_in; 327 return true; 328 } 329 } 330 i++; 331 } 332 return false; 333 } 334 335 // Constructs the system class path (aka boot class path) from the following 336 // components, in order: 337 // 338 // prefix // from -Xbootclasspath/p:... 339 // endorsed // the expansion of -Djava.endorsed.dirs=... 340 // base // from os::get_system_properties() or -Xbootclasspath= 341 // suffix // from -Xbootclasspath/a:... 342 // 343 // java.endorsed.dirs is a list of directories; any jar or zip files in the 344 // directories are added to the sysclasspath just before the base. 345 // 346 // This could be AllStatic, but it isn't needed after argument processing is 347 // complete. 348 class SysClassPath: public StackObj { 349 public: 350 SysClassPath(const char* base); 351 ~SysClassPath(); 352 353 inline void set_base(const char* base); 354 inline void add_prefix(const char* prefix); 355 inline void add_suffix_to_prefix(const char* suffix); 356 inline void add_suffix(const char* suffix); 357 inline void reset_path(const char* base); 358 359 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 360 // property. Must be called after all command-line arguments have been 361 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 362 // combined_path(). 363 void expand_endorsed(); 364 365 inline const char* get_base() const { return _items[_scp_base]; } 366 inline const char* get_prefix() const { return _items[_scp_prefix]; } 367 inline const char* get_suffix() const { return _items[_scp_suffix]; } 368 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 369 370 // Combine all the components into a single c-heap-allocated string; caller 371 // must free the string if/when no longer needed. 372 char* combined_path(); 373 374 private: 375 // Utility routines. 376 static char* add_to_path(const char* path, const char* str, bool prepend); 377 static char* add_jars_to_path(char* path, const char* directory); 378 379 inline void reset_item_at(int index); 380 381 // Array indices for the items that make up the sysclasspath. All except the 382 // base are allocated in the C heap and freed by this class. 383 enum { 384 _scp_prefix, // from -Xbootclasspath/p:... 385 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 386 _scp_base, // the default sysclasspath 387 _scp_suffix, // from -Xbootclasspath/a:... 388 _scp_nitems // the number of items, must be last. 389 }; 390 391 const char* _items[_scp_nitems]; 392 DEBUG_ONLY(bool _expansion_done;) 393 }; 394 395 SysClassPath::SysClassPath(const char* base) { 396 memset(_items, 0, sizeof(_items)); 397 _items[_scp_base] = base; 398 DEBUG_ONLY(_expansion_done = false;) 399 } 400 401 SysClassPath::~SysClassPath() { 402 // Free everything except the base. 403 for (int i = 0; i < _scp_nitems; ++i) { 404 if (i != _scp_base) reset_item_at(i); 405 } 406 DEBUG_ONLY(_expansion_done = false;) 407 } 408 409 inline void SysClassPath::set_base(const char* base) { 410 _items[_scp_base] = base; 411 } 412 413 inline void SysClassPath::add_prefix(const char* prefix) { 414 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 415 } 416 417 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 418 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 419 } 420 421 inline void SysClassPath::add_suffix(const char* suffix) { 422 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 423 } 424 425 inline void SysClassPath::reset_item_at(int index) { 426 assert(index < _scp_nitems && index != _scp_base, "just checking"); 427 if (_items[index] != NULL) { 428 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 429 _items[index] = NULL; 430 } 431 } 432 433 inline void SysClassPath::reset_path(const char* base) { 434 // Clear the prefix and suffix. 435 reset_item_at(_scp_prefix); 436 reset_item_at(_scp_suffix); 437 set_base(base); 438 } 439 440 //------------------------------------------------------------------------------ 441 442 void SysClassPath::expand_endorsed() { 443 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 444 445 const char* path = Arguments::get_property("java.endorsed.dirs"); 446 if (path == NULL) { 447 path = Arguments::get_endorsed_dir(); 448 assert(path != NULL, "no default for java.endorsed.dirs"); 449 } 450 451 char* expanded_path = NULL; 452 const char separator = *os::path_separator(); 453 const char* const end = path + strlen(path); 454 while (path < end) { 455 const char* tmp_end = strchr(path, separator); 456 if (tmp_end == NULL) { 457 expanded_path = add_jars_to_path(expanded_path, path); 458 path = end; 459 } else { 460 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 461 memcpy(dirpath, path, tmp_end - path); 462 dirpath[tmp_end - path] = '\0'; 463 expanded_path = add_jars_to_path(expanded_path, dirpath); 464 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 465 path = tmp_end + 1; 466 } 467 } 468 _items[_scp_endorsed] = expanded_path; 469 DEBUG_ONLY(_expansion_done = true;) 470 } 471 472 // Combine the bootclasspath elements, some of which may be null, into a single 473 // c-heap-allocated string. 474 char* SysClassPath::combined_path() { 475 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 476 assert(_expansion_done, "must call expand_endorsed() first."); 477 478 size_t lengths[_scp_nitems]; 479 size_t total_len = 0; 480 481 const char separator = *os::path_separator(); 482 483 // Get the lengths. 484 int i; 485 for (i = 0; i < _scp_nitems; ++i) { 486 if (_items[i] != NULL) { 487 lengths[i] = strlen(_items[i]); 488 // Include space for the separator char (or a NULL for the last item). 489 total_len += lengths[i] + 1; 490 } 491 } 492 assert(total_len > 0, "empty sysclasspath not allowed"); 493 494 // Copy the _items to a single string. 495 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 496 char* cp_tmp = cp; 497 for (i = 0; i < _scp_nitems; ++i) { 498 if (_items[i] != NULL) { 499 memcpy(cp_tmp, _items[i], lengths[i]); 500 cp_tmp += lengths[i]; 501 *cp_tmp++ = separator; 502 } 503 } 504 *--cp_tmp = '\0'; // Replace the extra separator. 505 return cp; 506 } 507 508 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 509 char* 510 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 511 char *cp; 512 513 assert(str != NULL, "just checking"); 514 if (path == NULL) { 515 size_t len = strlen(str) + 1; 516 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 517 memcpy(cp, str, len); // copy the trailing null 518 } else { 519 const char separator = *os::path_separator(); 520 size_t old_len = strlen(path); 521 size_t str_len = strlen(str); 522 size_t len = old_len + str_len + 2; 523 524 if (prepend) { 525 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 526 char* cp_tmp = cp; 527 memcpy(cp_tmp, str, str_len); 528 cp_tmp += str_len; 529 *cp_tmp = separator; 530 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 531 FREE_C_HEAP_ARRAY(char, path, mtInternal); 532 } else { 533 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 534 char* cp_tmp = cp + old_len; 535 *cp_tmp = separator; 536 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 537 } 538 } 539 return cp; 540 } 541 542 // Scan the directory and append any jar or zip files found to path. 543 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 544 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 545 DIR* dir = os::opendir(directory); 546 if (dir == NULL) return path; 547 548 char dir_sep[2] = { '\0', '\0' }; 549 size_t directory_len = strlen(directory); 550 const char fileSep = *os::file_separator(); 551 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 552 553 /* Scan the directory for jars/zips, appending them to path. */ 554 struct dirent *entry; 555 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 556 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 557 const char* name = entry->d_name; 558 const char* ext = name + strlen(name) - 4; 559 bool isJarOrZip = ext > name && 560 (os::file_name_strcmp(ext, ".jar") == 0 || 561 os::file_name_strcmp(ext, ".zip") == 0); 562 if (isJarOrZip) { 563 size_t length = directory_len + 2 + strlen(name); 564 char* jarpath = NEW_C_HEAP_ARRAY(char, length, mtInternal); 565 jio_snprintf(jarpath, length, "%s%s%s", directory, dir_sep, name); 566 path = add_to_path(path, jarpath, false); 567 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 568 } 569 } 570 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 571 os::closedir(dir); 572 return path; 573 } 574 575 // Parses a memory size specification string. 576 static bool atomull(const char *s, julong* result) { 577 julong n = 0; 578 int args_read = sscanf(s, JULONG_FORMAT, &n); 579 if (args_read != 1) { 580 return false; 581 } 582 while (*s != '\0' && isdigit(*s)) { 583 s++; 584 } 585 // 4705540: illegal if more characters are found after the first non-digit 586 if (strlen(s) > 1) { 587 return false; 588 } 589 switch (*s) { 590 case 'T': case 't': 591 *result = n * G * K; 592 // Check for overflow. 593 if (*result/((julong)G * K) != n) return false; 594 return true; 595 case 'G': case 'g': 596 *result = n * G; 597 if (*result/G != n) return false; 598 return true; 599 case 'M': case 'm': 600 *result = n * M; 601 if (*result/M != n) return false; 602 return true; 603 case 'K': case 'k': 604 *result = n * K; 605 if (*result/K != n) return false; 606 return true; 607 case '\0': 608 *result = n; 609 return true; 610 default: 611 return false; 612 } 613 } 614 615 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 616 if (size < min_size) return arg_too_small; 617 // Check that size will fit in a size_t (only relevant on 32-bit) 618 if (size > max_uintx) return arg_too_big; 619 return arg_in_range; 620 } 621 622 // Describe an argument out of range error 623 void Arguments::describe_range_error(ArgsRange errcode) { 624 switch(errcode) { 625 case arg_too_big: 626 jio_fprintf(defaultStream::error_stream(), 627 "The specified size exceeds the maximum " 628 "representable size.\n"); 629 break; 630 case arg_too_small: 631 case arg_unreadable: 632 case arg_in_range: 633 // do nothing for now 634 break; 635 default: 636 ShouldNotReachHere(); 637 } 638 } 639 640 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 641 return CommandLineFlags::boolAtPut(name, &value, origin); 642 } 643 644 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 645 double v; 646 if (sscanf(value, "%lf", &v) != 1) { 647 return false; 648 } 649 650 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 651 return true; 652 } 653 return false; 654 } 655 656 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 657 julong v; 658 intx intx_v; 659 bool is_neg = false; 660 // Check the sign first since atomull() parses only unsigned values. 661 if (*value == '-') { 662 if (!CommandLineFlags::intxAt(name, &intx_v)) { 663 return false; 664 } 665 value++; 666 is_neg = true; 667 } 668 if (!atomull(value, &v)) { 669 return false; 670 } 671 intx_v = (intx) v; 672 if (is_neg) { 673 intx_v = -intx_v; 674 } 675 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 676 return true; 677 } 678 uintx uintx_v = (uintx) v; 679 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 680 return true; 681 } 682 uint64_t uint64_t_v = (uint64_t) v; 683 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 684 return true; 685 } 686 return false; 687 } 688 689 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 690 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 691 // Contract: CommandLineFlags always returns a pointer that needs freeing. 692 FREE_C_HEAP_ARRAY(char, value, mtInternal); 693 return true; 694 } 695 696 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 697 const char* old_value = ""; 698 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 699 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 700 size_t new_len = strlen(new_value); 701 const char* value; 702 char* free_this_too = NULL; 703 if (old_len == 0) { 704 value = new_value; 705 } else if (new_len == 0) { 706 value = old_value; 707 } else { 708 size_t length = old_len + 1 + new_len + 1; 709 char* buf = NEW_C_HEAP_ARRAY(char, length, mtInternal); 710 // each new setting adds another LINE to the switch: 711 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 712 value = buf; 713 free_this_too = buf; 714 } 715 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 716 // CommandLineFlags always returns a pointer that needs freeing. 717 FREE_C_HEAP_ARRAY(char, value, mtInternal); 718 if (free_this_too != NULL) { 719 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 720 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 721 } 722 return true; 723 } 724 725 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 726 727 // range of acceptable characters spelled out for portability reasons 728 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 729 #define BUFLEN 255 730 char name[BUFLEN+1]; 731 char dummy; 732 733 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 734 return set_bool_flag(name, false, origin); 735 } 736 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 737 return set_bool_flag(name, true, origin); 738 } 739 740 char punct; 741 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 742 const char* value = strchr(arg, '=') + 1; 743 Flag* flag = Flag::find_flag(name, strlen(name)); 744 if (flag != NULL && flag->is_ccstr()) { 745 if (flag->ccstr_accumulates()) { 746 return append_to_string_flag(name, value, origin); 747 } else { 748 if (value[0] == '\0') { 749 value = NULL; 750 } 751 return set_string_flag(name, value, origin); 752 } 753 } 754 } 755 756 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 757 const char* value = strchr(arg, '=') + 1; 758 // -XX:Foo:=xxx will reset the string flag to the given value. 759 if (value[0] == '\0') { 760 value = NULL; 761 } 762 return set_string_flag(name, value, origin); 763 } 764 765 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 766 #define SIGNED_NUMBER_RANGE "[-0123456789]" 767 #define NUMBER_RANGE "[0123456789]" 768 char value[BUFLEN + 1]; 769 char value2[BUFLEN + 1]; 770 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 771 // Looks like a floating-point number -- try again with more lenient format string 772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 773 return set_fp_numeric_flag(name, value, origin); 774 } 775 } 776 777 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 778 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 779 return set_numeric_flag(name, value, origin); 780 } 781 782 return false; 783 } 784 785 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 786 assert(bldarray != NULL, "illegal argument"); 787 788 if (arg == NULL) { 789 return; 790 } 791 792 int new_count = *count + 1; 793 794 // expand the array and add arg to the last element 795 if (*bldarray == NULL) { 796 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 797 } else { 798 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 799 } 800 (*bldarray)[*count] = strdup(arg); 801 *count = new_count; 802 } 803 804 void Arguments::build_jvm_args(const char* arg) { 805 add_string(&_jvm_args_array, &_num_jvm_args, arg); 806 } 807 808 void Arguments::build_jvm_flags(const char* arg) { 809 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 810 } 811 812 // utility function to return a string that concatenates all 813 // strings in a given char** array 814 const char* Arguments::build_resource_string(char** args, int count) { 815 if (args == NULL || count == 0) { 816 return NULL; 817 } 818 size_t length = 0; 819 for (int i = 0; i < count; i++) { 820 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 821 } 822 char* s = NEW_RESOURCE_ARRAY(char, length); 823 char* dst = s; 824 for (int j = 0; j < count; j++) { 825 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 826 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 827 dst += offset; 828 length -= offset; 829 } 830 return (const char*) s; 831 } 832 833 void Arguments::print_on(outputStream* st) { 834 st->print_cr("VM Arguments:"); 835 if (num_jvm_flags() > 0) { 836 st->print("jvm_flags: "); print_jvm_flags_on(st); 837 } 838 if (num_jvm_args() > 0) { 839 st->print("jvm_args: "); print_jvm_args_on(st); 840 } 841 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 842 if (_java_class_path != NULL) { 843 char* path = _java_class_path->value(); 844 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 845 } 846 st->print_cr("Launcher Type: %s", _sun_java_launcher); 847 } 848 849 void Arguments::print_jvm_flags_on(outputStream* st) { 850 if (_num_jvm_flags > 0) { 851 for (int i=0; i < _num_jvm_flags; i++) { 852 st->print("%s ", _jvm_flags_array[i]); 853 } 854 st->cr(); 855 } 856 } 857 858 void Arguments::print_jvm_args_on(outputStream* st) { 859 if (_num_jvm_args > 0) { 860 for (int i=0; i < _num_jvm_args; i++) { 861 st->print("%s ", _jvm_args_array[i]); 862 } 863 st->cr(); 864 } 865 } 866 867 bool Arguments::process_argument(const char* arg, 868 jboolean ignore_unrecognized, Flag::Flags origin) { 869 870 JDK_Version since = JDK_Version(); 871 872 if (parse_argument(arg, origin) || ignore_unrecognized) { 873 return true; 874 } 875 876 bool has_plus_minus = (*arg == '+' || *arg == '-'); 877 const char* const argname = has_plus_minus ? arg + 1 : arg; 878 if (is_newly_obsolete(arg, &since)) { 879 char version[256]; 880 since.to_string(version, sizeof(version)); 881 warning("ignoring option %s; support was removed in %s", argname, version); 882 return true; 883 } 884 885 // For locked flags, report a custom error message if available. 886 // Otherwise, report the standard unrecognized VM option. 887 888 size_t arg_len; 889 const char* equal_sign = strchr(argname, '='); 890 if (equal_sign == NULL) { 891 arg_len = strlen(argname); 892 } else { 893 arg_len = equal_sign - argname; 894 } 895 896 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 897 if (found_flag != NULL) { 898 char locked_message_buf[BUFLEN]; 899 found_flag->get_locked_message(locked_message_buf, BUFLEN); 900 if (strlen(locked_message_buf) == 0) { 901 if (found_flag->is_bool() && !has_plus_minus) { 902 jio_fprintf(defaultStream::error_stream(), 903 "Missing +/- setting for VM option '%s'\n", argname); 904 } else if (!found_flag->is_bool() && has_plus_minus) { 905 jio_fprintf(defaultStream::error_stream(), 906 "Unexpected +/- setting in VM option '%s'\n", argname); 907 } else { 908 jio_fprintf(defaultStream::error_stream(), 909 "Improperly specified VM option '%s'\n", argname); 910 } 911 } else { 912 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 913 } 914 } else { 915 jio_fprintf(defaultStream::error_stream(), 916 "Unrecognized VM option '%s'\n", argname); 917 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 918 if (fuzzy_matched != NULL) { 919 jio_fprintf(defaultStream::error_stream(), 920 "Did you mean '%s%s%s'?\n", 921 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 922 fuzzy_matched->_name, 923 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 924 } 925 } 926 927 // allow for commandline "commenting out" options like -XX:#+Verbose 928 return arg[0] == '#'; 929 } 930 931 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 932 FILE* stream = fopen(file_name, "rb"); 933 if (stream == NULL) { 934 if (should_exist) { 935 jio_fprintf(defaultStream::error_stream(), 936 "Could not open settings file %s\n", file_name); 937 return false; 938 } else { 939 return true; 940 } 941 } 942 943 char token[1024]; 944 int pos = 0; 945 946 bool in_white_space = true; 947 bool in_comment = false; 948 bool in_quote = false; 949 char quote_c = 0; 950 bool result = true; 951 952 int c = getc(stream); 953 while(c != EOF && pos < (int)(sizeof(token)-1)) { 954 if (in_white_space) { 955 if (in_comment) { 956 if (c == '\n') in_comment = false; 957 } else { 958 if (c == '#') in_comment = true; 959 else if (!isspace(c)) { 960 in_white_space = false; 961 token[pos++] = c; 962 } 963 } 964 } else { 965 if (c == '\n' || (!in_quote && isspace(c))) { 966 // token ends at newline, or at unquoted whitespace 967 // this allows a way to include spaces in string-valued options 968 token[pos] = '\0'; 969 logOption(token); 970 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 971 build_jvm_flags(token); 972 pos = 0; 973 in_white_space = true; 974 in_quote = false; 975 } else if (!in_quote && (c == '\'' || c == '"')) { 976 in_quote = true; 977 quote_c = c; 978 } else if (in_quote && (c == quote_c)) { 979 in_quote = false; 980 } else { 981 token[pos++] = c; 982 } 983 } 984 c = getc(stream); 985 } 986 if (pos > 0) { 987 token[pos] = '\0'; 988 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 989 build_jvm_flags(token); 990 } 991 fclose(stream); 992 return result; 993 } 994 995 //============================================================================================================= 996 // Parsing of properties (-D) 997 998 const char* Arguments::get_property(const char* key) { 999 return PropertyList_get_value(system_properties(), key); 1000 } 1001 1002 bool Arguments::add_property(const char* prop) { 1003 const char* eq = strchr(prop, '='); 1004 char* key; 1005 // ns must be static--its address may be stored in a SystemProperty object. 1006 const static char ns[1] = {0}; 1007 char* value = (char *)ns; 1008 1009 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1010 key = AllocateHeap(key_len + 1, mtInternal); 1011 strncpy(key, prop, key_len); 1012 key[key_len] = '\0'; 1013 1014 if (eq != NULL) { 1015 size_t value_len = strlen(prop) - key_len - 1; 1016 value = AllocateHeap(value_len + 1, mtInternal); 1017 strncpy(value, &prop[key_len + 1], value_len + 1); 1018 } 1019 1020 if (strcmp(key, "java.compiler") == 0) { 1021 process_java_compiler_argument(value); 1022 FreeHeap(key); 1023 if (eq != NULL) { 1024 FreeHeap(value); 1025 } 1026 return true; 1027 } else if (strcmp(key, "sun.java.command") == 0) { 1028 _java_command = value; 1029 1030 // Record value in Arguments, but let it get passed to Java. 1031 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 1032 // launcher.pid property is private and is processed 1033 // in process_sun_java_launcher_properties(); 1034 // the sun.java.launcher property is passed on to the java application 1035 FreeHeap(key); 1036 if (eq != NULL) { 1037 FreeHeap(value); 1038 } 1039 return true; 1040 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1041 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1042 // its value without going through the property list or making a Java call. 1043 _java_vendor_url_bug = value; 1044 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1045 PropertyList_unique_add(&_system_properties, key, value, true); 1046 return true; 1047 } 1048 // Create new property and add at the end of the list 1049 PropertyList_unique_add(&_system_properties, key, value); 1050 return true; 1051 } 1052 1053 //=========================================================================================================== 1054 // Setting int/mixed/comp mode flags 1055 1056 void Arguments::set_mode_flags(Mode mode) { 1057 // Set up default values for all flags. 1058 // If you add a flag to any of the branches below, 1059 // add a default value for it here. 1060 set_java_compiler(false); 1061 _mode = mode; 1062 1063 // Ensure Agent_OnLoad has the correct initial values. 1064 // This may not be the final mode; mode may change later in onload phase. 1065 PropertyList_unique_add(&_system_properties, "java.vm.info", 1066 (char*)VM_Version::vm_info_string(), false); 1067 1068 UseInterpreter = true; 1069 UseCompiler = true; 1070 UseLoopCounter = true; 1071 1072 #ifndef ZERO 1073 // Turn these off for mixed and comp. Leave them on for Zero. 1074 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 1075 UseFastAccessorMethods = (mode == _int); 1076 } 1077 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 1078 UseFastEmptyMethods = (mode == _int); 1079 } 1080 #endif 1081 1082 // Default values may be platform/compiler dependent - 1083 // use the saved values 1084 ClipInlining = Arguments::_ClipInlining; 1085 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1086 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1087 BackgroundCompilation = Arguments::_BackgroundCompilation; 1088 1089 // Change from defaults based on mode 1090 switch (mode) { 1091 default: 1092 ShouldNotReachHere(); 1093 break; 1094 case _int: 1095 UseCompiler = false; 1096 UseLoopCounter = false; 1097 AlwaysCompileLoopMethods = false; 1098 UseOnStackReplacement = false; 1099 break; 1100 case _mixed: 1101 // same as default 1102 break; 1103 case _comp: 1104 UseInterpreter = false; 1105 BackgroundCompilation = false; 1106 ClipInlining = false; 1107 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1108 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1109 // compile a level 4 (C2) and then continue executing it. 1110 if (TieredCompilation) { 1111 Tier3InvokeNotifyFreqLog = 0; 1112 Tier4InvocationThreshold = 0; 1113 } 1114 break; 1115 } 1116 } 1117 1118 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1119 // Conflict: required to use shared spaces (-Xshare:on), but 1120 // incompatible command line options were chosen. 1121 1122 static void no_shared_spaces(const char* message) { 1123 if (RequireSharedSpaces) { 1124 jio_fprintf(defaultStream::error_stream(), 1125 "Class data sharing is inconsistent with other specified options.\n"); 1126 vm_exit_during_initialization("Unable to use shared archive.", message); 1127 } else { 1128 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1129 } 1130 } 1131 #endif 1132 1133 void Arguments::set_tiered_flags() { 1134 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1135 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1136 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1137 } 1138 if (CompilationPolicyChoice < 2) { 1139 vm_exit_during_initialization( 1140 "Incompatible compilation policy selected", NULL); 1141 } 1142 // Increase the code cache size - tiered compiles a lot more. 1143 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1144 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1145 } 1146 if (!UseInterpreter) { // -Xcomp 1147 Tier3InvokeNotifyFreqLog = 0; 1148 Tier4InvocationThreshold = 0; 1149 } 1150 } 1151 1152 /** 1153 * Returns the minimum number of compiler threads needed to run the JVM. The following 1154 * configurations are possible. 1155 * 1156 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1157 * compiler threads is 0. 1158 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1159 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1160 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1161 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1162 * C1 can be used, so the minimum number of compiler threads is 1. 1163 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1164 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1165 * the minimum number of compiler threads is 2. 1166 */ 1167 int Arguments::get_min_number_of_compiler_threads() { 1168 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1169 return 0; // case 1 1170 #else 1171 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1172 return 1; // case 2 or case 3 1173 } 1174 return 2; // case 4 (tiered) 1175 #endif 1176 } 1177 1178 #if INCLUDE_ALL_GCS 1179 static void disable_adaptive_size_policy(const char* collector_name) { 1180 if (UseAdaptiveSizePolicy) { 1181 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1182 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1183 collector_name); 1184 } 1185 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1186 } 1187 } 1188 1189 void Arguments::set_parnew_gc_flags() { 1190 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1191 "control point invariant"); 1192 assert(UseParNewGC, "Error"); 1193 1194 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1195 disable_adaptive_size_policy("UseParNewGC"); 1196 1197 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1198 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1199 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1200 } else if (ParallelGCThreads == 0) { 1201 jio_fprintf(defaultStream::error_stream(), 1202 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1203 vm_exit(1); 1204 } 1205 1206 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1207 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1208 // we set them to 1024 and 1024. 1209 // See CR 6362902. 1210 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1211 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1212 } 1213 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1214 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1215 } 1216 1217 // AlwaysTenure flag should make ParNew promote all at first collection. 1218 // See CR 6362902. 1219 if (AlwaysTenure) { 1220 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 1221 } 1222 // When using compressed oops, we use local overflow stacks, 1223 // rather than using a global overflow list chained through 1224 // the klass word of the object's pre-image. 1225 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1226 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1227 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1228 } 1229 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1230 } 1231 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1232 } 1233 1234 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1235 // sparc/solaris for certain applications, but would gain from 1236 // further optimization and tuning efforts, and would almost 1237 // certainly gain from analysis of platform and environment. 1238 void Arguments::set_cms_and_parnew_gc_flags() { 1239 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1240 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1241 1242 // If we are using CMS, we prefer to UseParNewGC, 1243 // unless explicitly forbidden. 1244 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1245 FLAG_SET_ERGO(bool, UseParNewGC, true); 1246 } 1247 1248 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1249 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1250 1251 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1252 // as needed. 1253 if (UseParNewGC) { 1254 set_parnew_gc_flags(); 1255 } 1256 1257 size_t max_heap = align_size_down(MaxHeapSize, 1258 CardTableRS::ct_max_alignment_constraint()); 1259 1260 // Now make adjustments for CMS 1261 intx tenuring_default = (intx)6; 1262 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1263 1264 // Preferred young gen size for "short" pauses: 1265 // upper bound depends on # of threads and NewRatio. 1266 const uintx parallel_gc_threads = 1267 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1268 const size_t preferred_max_new_size_unaligned = 1269 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1270 size_t preferred_max_new_size = 1271 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1272 1273 // Unless explicitly requested otherwise, size young gen 1274 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1275 1276 // If either MaxNewSize or NewRatio is set on the command line, 1277 // assume the user is trying to set the size of the young gen. 1278 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1279 1280 // Set MaxNewSize to our calculated preferred_max_new_size unless 1281 // NewSize was set on the command line and it is larger than 1282 // preferred_max_new_size. 1283 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1284 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1285 } else { 1286 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1287 } 1288 if (PrintGCDetails && Verbose) { 1289 // Too early to use gclog_or_tty 1290 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1291 } 1292 1293 // Code along this path potentially sets NewSize and OldSize 1294 if (PrintGCDetails && Verbose) { 1295 // Too early to use gclog_or_tty 1296 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1297 " initial_heap_size: " SIZE_FORMAT 1298 " max_heap: " SIZE_FORMAT, 1299 min_heap_size(), InitialHeapSize, max_heap); 1300 } 1301 size_t min_new = preferred_max_new_size; 1302 if (FLAG_IS_CMDLINE(NewSize)) { 1303 min_new = NewSize; 1304 } 1305 if (max_heap > min_new && min_heap_size() > min_new) { 1306 // Unless explicitly requested otherwise, make young gen 1307 // at least min_new, and at most preferred_max_new_size. 1308 if (FLAG_IS_DEFAULT(NewSize)) { 1309 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1310 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1311 if (PrintGCDetails && Verbose) { 1312 // Too early to use gclog_or_tty 1313 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1314 } 1315 } 1316 // Unless explicitly requested otherwise, size old gen 1317 // so it's NewRatio x of NewSize. 1318 if (FLAG_IS_DEFAULT(OldSize)) { 1319 if (max_heap > NewSize) { 1320 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1321 if (PrintGCDetails && Verbose) { 1322 // Too early to use gclog_or_tty 1323 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1324 } 1325 } 1326 } 1327 } 1328 } 1329 // Unless explicitly requested otherwise, definitely 1330 // promote all objects surviving "tenuring_default" scavenges. 1331 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1332 FLAG_IS_DEFAULT(SurvivorRatio)) { 1333 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1334 } 1335 // If we decided above (or user explicitly requested) 1336 // `promote all' (via MaxTenuringThreshold := 0), 1337 // prefer minuscule survivor spaces so as not to waste 1338 // space for (non-existent) survivors 1339 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1340 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1341 } 1342 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1343 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1344 // This is done in order to make ParNew+CMS configuration to work 1345 // with YoungPLABSize and OldPLABSize options. 1346 // See CR 6362902. 1347 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1348 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1349 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1350 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1351 // the value (either from the command line or ergonomics) of 1352 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1353 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1354 } else { 1355 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1356 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1357 // we'll let it to take precedence. 1358 jio_fprintf(defaultStream::error_stream(), 1359 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1360 " options are specified for the CMS collector." 1361 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1362 } 1363 } 1364 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1365 // OldPLAB sizing manually turned off: Use a larger default setting, 1366 // unless it was manually specified. This is because a too-low value 1367 // will slow down scavenges. 1368 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1369 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1370 } 1371 } 1372 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1373 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1374 // If either of the static initialization defaults have changed, note this 1375 // modification. 1376 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1377 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1378 } 1379 1380 if (PrintGCDetails && Verbose) { 1381 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1382 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1383 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1384 } 1385 } 1386 #endif // INCLUDE_ALL_GCS 1387 1388 void set_object_alignment() { 1389 // Object alignment. 1390 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1391 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1392 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1393 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1394 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1395 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1396 1397 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1398 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1399 1400 // Oop encoding heap max 1401 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1402 1403 #if INCLUDE_ALL_GCS 1404 // Set CMS global values 1405 CompactibleFreeListSpace::set_cms_values(); 1406 #endif // INCLUDE_ALL_GCS 1407 } 1408 1409 bool verify_object_alignment() { 1410 // Object alignment. 1411 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1412 jio_fprintf(defaultStream::error_stream(), 1413 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1414 (int)ObjectAlignmentInBytes); 1415 return false; 1416 } 1417 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1418 jio_fprintf(defaultStream::error_stream(), 1419 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1420 (int)ObjectAlignmentInBytes, BytesPerLong); 1421 return false; 1422 } 1423 // It does not make sense to have big object alignment 1424 // since a space lost due to alignment will be greater 1425 // then a saved space from compressed oops. 1426 if ((int)ObjectAlignmentInBytes > 256) { 1427 jio_fprintf(defaultStream::error_stream(), 1428 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1429 (int)ObjectAlignmentInBytes); 1430 return false; 1431 } 1432 // In case page size is very small. 1433 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1434 jio_fprintf(defaultStream::error_stream(), 1435 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1436 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1437 return false; 1438 } 1439 if(SurvivorAlignmentInBytes == 0) { 1440 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1441 } else { 1442 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1443 jio_fprintf(defaultStream::error_stream(), 1444 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1445 (int)SurvivorAlignmentInBytes); 1446 return false; 1447 } 1448 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1449 jio_fprintf(defaultStream::error_stream(), 1450 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1451 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1452 return false; 1453 } 1454 } 1455 return true; 1456 } 1457 1458 size_t Arguments::max_heap_for_compressed_oops() { 1459 // Avoid sign flip. 1460 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1461 // We need to fit both the NULL page and the heap into the memory budget, while 1462 // keeping alignment constraints of the heap. To guarantee the latter, as the 1463 // NULL page is located before the heap, we pad the NULL page to the conservative 1464 // maximum alignment that the GC may ever impose upon the heap. 1465 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1466 _conservative_max_heap_alignment); 1467 1468 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1469 NOT_LP64(ShouldNotReachHere(); return 0); 1470 } 1471 1472 bool Arguments::should_auto_select_low_pause_collector() { 1473 if (UseAutoGCSelectPolicy && 1474 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1475 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1476 if (PrintGCDetails) { 1477 // Cannot use gclog_or_tty yet. 1478 tty->print_cr("Automatic selection of the low pause collector" 1479 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1480 } 1481 return true; 1482 } 1483 return false; 1484 } 1485 1486 void Arguments::set_use_compressed_oops() { 1487 #ifndef ZERO 1488 #ifdef _LP64 1489 // MaxHeapSize is not set up properly at this point, but 1490 // the only value that can override MaxHeapSize if we are 1491 // to use UseCompressedOops is InitialHeapSize. 1492 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1493 1494 if (max_heap_size <= max_heap_for_compressed_oops()) { 1495 #if !defined(COMPILER1) || defined(TIERED) 1496 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1497 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1498 } 1499 #endif 1500 #ifdef _WIN64 1501 if (UseLargePages && UseCompressedOops) { 1502 // Cannot allocate guard pages for implicit checks in indexed addressing 1503 // mode, when large pages are specified on windows. 1504 // This flag could be switched ON if narrow oop base address is set to 0, 1505 // see code in Universe::initialize_heap(). 1506 Universe::set_narrow_oop_use_implicit_null_checks(false); 1507 } 1508 #endif // _WIN64 1509 } else { 1510 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1511 warning("Max heap size too large for Compressed Oops"); 1512 FLAG_SET_DEFAULT(UseCompressedOops, false); 1513 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1514 } 1515 } 1516 #endif // _LP64 1517 #endif // ZERO 1518 } 1519 1520 1521 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1522 // set_use_compressed_oops(). 1523 void Arguments::set_use_compressed_klass_ptrs() { 1524 #ifndef ZERO 1525 #ifdef _LP64 1526 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1527 if (!UseCompressedOops) { 1528 if (UseCompressedClassPointers) { 1529 warning("UseCompressedClassPointers requires UseCompressedOops"); 1530 } 1531 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1532 } else { 1533 // Turn on UseCompressedClassPointers too 1534 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1535 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1536 } 1537 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1538 if (UseCompressedClassPointers) { 1539 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1540 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1541 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1542 } 1543 } 1544 } 1545 #endif // _LP64 1546 #endif // !ZERO 1547 } 1548 1549 void Arguments::set_conservative_max_heap_alignment() { 1550 // The conservative maximum required alignment for the heap is the maximum of 1551 // the alignments imposed by several sources: any requirements from the heap 1552 // itself, the collector policy and the maximum page size we may run the VM 1553 // with. 1554 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1555 #if INCLUDE_ALL_GCS 1556 if (UseParallelGC) { 1557 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1558 } else if (UseG1GC) { 1559 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1560 } 1561 #endif // INCLUDE_ALL_GCS 1562 _conservative_max_heap_alignment = MAX4(heap_alignment, 1563 (size_t)os::vm_allocation_granularity(), 1564 os::max_page_size(), 1565 CollectorPolicy::compute_heap_alignment()); 1566 } 1567 1568 void Arguments::select_gc_ergonomically() { 1569 if (os::is_server_class_machine()) { 1570 if (should_auto_select_low_pause_collector()) { 1571 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1572 } else { 1573 FLAG_SET_ERGO(bool, UseParallelGC, true); 1574 } 1575 } 1576 } 1577 1578 void Arguments::select_gc() { 1579 if (!gc_selected()) { 1580 select_gc_ergonomically(); 1581 } 1582 } 1583 1584 void Arguments::set_ergonomics_flags() { 1585 select_gc(); 1586 1587 #ifdef COMPILER2 1588 // Shared spaces work fine with other GCs but causes bytecode rewriting 1589 // to be disabled, which hurts interpreter performance and decreases 1590 // server performance. When -server is specified, keep the default off 1591 // unless it is asked for. Future work: either add bytecode rewriting 1592 // at link time, or rewrite bytecodes in non-shared methods. 1593 if (!DumpSharedSpaces && !RequireSharedSpaces && 1594 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1595 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1596 } 1597 #endif 1598 1599 set_conservative_max_heap_alignment(); 1600 1601 #ifndef ZERO 1602 #ifdef _LP64 1603 set_use_compressed_oops(); 1604 1605 // set_use_compressed_klass_ptrs() must be called after calling 1606 // set_use_compressed_oops(). 1607 set_use_compressed_klass_ptrs(); 1608 1609 // Also checks that certain machines are slower with compressed oops 1610 // in vm_version initialization code. 1611 #endif // _LP64 1612 #endif // !ZERO 1613 } 1614 1615 void Arguments::set_parallel_gc_flags() { 1616 assert(UseParallelGC || UseParallelOldGC, "Error"); 1617 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1618 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1619 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1620 } 1621 FLAG_SET_DEFAULT(UseParallelGC, true); 1622 1623 // If no heap maximum was requested explicitly, use some reasonable fraction 1624 // of the physical memory, up to a maximum of 1GB. 1625 FLAG_SET_DEFAULT(ParallelGCThreads, 1626 Abstract_VM_Version::parallel_worker_threads()); 1627 if (ParallelGCThreads == 0) { 1628 jio_fprintf(defaultStream::error_stream(), 1629 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1630 vm_exit(1); 1631 } 1632 1633 if (UseAdaptiveSizePolicy) { 1634 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1635 // unless the user actually sets these flags. 1636 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1637 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1638 _min_heap_free_ratio = MinHeapFreeRatio; 1639 } 1640 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1641 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1642 _max_heap_free_ratio = MaxHeapFreeRatio; 1643 } 1644 } 1645 1646 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1647 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1648 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1649 // See CR 6362902 for details. 1650 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1651 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1652 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1653 } 1654 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1655 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1656 } 1657 } 1658 1659 if (UseParallelOldGC) { 1660 // Par compact uses lower default values since they are treated as 1661 // minimums. These are different defaults because of the different 1662 // interpretation and are not ergonomically set. 1663 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1664 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1665 } 1666 } 1667 } 1668 1669 void Arguments::set_g1_gc_flags() { 1670 assert(UseG1GC, "Error"); 1671 #ifdef COMPILER1 1672 FastTLABRefill = false; 1673 #endif 1674 FLAG_SET_DEFAULT(ParallelGCThreads, 1675 Abstract_VM_Version::parallel_worker_threads()); 1676 if (ParallelGCThreads == 0) { 1677 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1678 } 1679 1680 #if INCLUDE_ALL_GCS 1681 if (G1ConcRefinementThreads == 0) { 1682 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1683 } 1684 #endif 1685 1686 // MarkStackSize will be set (if it hasn't been set by the user) 1687 // when concurrent marking is initialized. 1688 // Its value will be based upon the number of parallel marking threads. 1689 // But we do set the maximum mark stack size here. 1690 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1691 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1692 } 1693 1694 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1695 // In G1, we want the default GC overhead goal to be higher than 1696 // say in PS. So we set it here to 10%. Otherwise the heap might 1697 // be expanded more aggressively than we would like it to. In 1698 // fact, even 10% seems to not be high enough in some cases 1699 // (especially small GC stress tests that the main thing they do 1700 // is allocation). We might consider increase it further. 1701 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1702 } 1703 1704 if (PrintGCDetails && Verbose) { 1705 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1706 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1707 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1708 } 1709 } 1710 1711 #if !INCLUDE_ALL_GCS 1712 #ifdef ASSERT 1713 static bool verify_serial_gc_flags() { 1714 return (UseSerialGC && 1715 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1716 UseParallelGC || UseParallelOldGC)); 1717 } 1718 #endif // ASSERT 1719 #endif // INCLUDE_ALL_GCS 1720 1721 void Arguments::set_gc_specific_flags() { 1722 #if INCLUDE_ALL_GCS 1723 // Set per-collector flags 1724 if (UseParallelGC || UseParallelOldGC) { 1725 set_parallel_gc_flags(); 1726 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 1727 set_cms_and_parnew_gc_flags(); 1728 } else if (UseParNewGC) { // Skipped if CMS is set above 1729 set_parnew_gc_flags(); 1730 } else if (UseG1GC) { 1731 set_g1_gc_flags(); 1732 } 1733 check_deprecated_gcs(); 1734 check_deprecated_gc_flags(); 1735 if (AssumeMP && !UseSerialGC) { 1736 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1737 warning("If the number of processors is expected to increase from one, then" 1738 " you should configure the number of parallel GC threads appropriately" 1739 " using -XX:ParallelGCThreads=N"); 1740 } 1741 } 1742 if (MinHeapFreeRatio == 100) { 1743 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1744 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1745 } 1746 1747 // If class unloading is disabled, also disable concurrent class unloading. 1748 if (!ClassUnloading) { 1749 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1750 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 1751 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1752 } 1753 #else // INCLUDE_ALL_GCS 1754 assert(verify_serial_gc_flags(), "SerialGC unset"); 1755 #endif // INCLUDE_ALL_GCS 1756 } 1757 1758 julong Arguments::limit_by_allocatable_memory(julong limit) { 1759 julong max_allocatable; 1760 julong result = limit; 1761 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1762 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1763 } 1764 return result; 1765 } 1766 1767 void Arguments::set_heap_size() { 1768 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1769 // Deprecated flag 1770 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1771 } 1772 1773 julong phys_mem = 1774 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1775 : (julong)MaxRAM; 1776 1777 // Experimental support for CGroup memory limits 1778 if (UseCGroupMemoryLimitForHeap) { 1779 // This is a rough indicator that a CGroup limit may be in force 1780 // for this process 1781 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 1782 FILE *fp = fopen(lim_file, "r"); 1783 if (fp != NULL) { 1784 julong cgroup_max = 0; 1785 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 1786 if (ret == 1 && cgroup_max > 0) { 1787 // If unlimited, cgroup_max will be a very large, but unspecified 1788 // value, so use initial phys_mem as a limit 1789 if (PrintGCDetails && Verbose) { 1790 // Cannot use gclog_or_tty yet. 1791 tty->print_cr("Setting phys_mem to the min of cgroup limit (" 1792 JULONG_FORMAT "MB) and initial phys_mem (" 1793 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 1794 } 1795 phys_mem = MIN2(cgroup_max, phys_mem); 1796 } else { 1797 warning("Unable to read/parse cgroup memory limit from %s: %s", 1798 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 1799 } 1800 fclose(fp); 1801 } else { 1802 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 1803 } 1804 } 1805 1806 // Convert Fraction to Precentage values 1807 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1808 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1809 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1810 1811 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1812 !FLAG_IS_DEFAULT(MinRAMFraction)) 1813 MinRAMPercentage = 100.0 / MinRAMFraction; 1814 1815 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1816 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1817 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1818 1819 // If the maximum heap size has not been set with -Xmx, 1820 // then set it as fraction of the size of physical memory, 1821 // respecting the maximum and minimum sizes of the heap. 1822 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1823 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1824 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1825 if (reasonable_min < MaxHeapSize) { 1826 // Small physical memory, so use a minimum fraction of it for the heap 1827 reasonable_max = reasonable_min; 1828 } else { 1829 // Not-small physical memory, so require a heap at least 1830 // as large as MaxHeapSize 1831 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1832 } 1833 1834 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1835 // Limit the heap size to ErgoHeapSizeLimit 1836 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1837 } 1838 if (UseCompressedOops) { 1839 // Limit the heap size to the maximum possible when using compressed oops 1840 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1841 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1842 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1843 // but it should be not less than default MaxHeapSize. 1844 max_coop_heap -= HeapBaseMinAddress; 1845 } 1846 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1847 } 1848 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1849 1850 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1851 // An initial heap size was specified on the command line, 1852 // so be sure that the maximum size is consistent. Done 1853 // after call to limit_by_allocatable_memory because that 1854 // method might reduce the allocation size. 1855 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1856 } 1857 1858 if (PrintGCDetails && Verbose) { 1859 // Cannot use gclog_or_tty yet. 1860 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1861 } 1862 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1863 } 1864 1865 // If the minimum or initial heap_size have not been set or requested to be set 1866 // ergonomically, set them accordingly. 1867 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1868 julong reasonable_minimum = (julong)(OldSize + NewSize); 1869 1870 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1871 1872 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1873 1874 if (InitialHeapSize == 0) { 1875 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1876 1877 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1878 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1879 1880 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1881 1882 if (PrintGCDetails && Verbose) { 1883 // Cannot use gclog_or_tty yet. 1884 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1885 } 1886 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1887 } 1888 // If the minimum heap size has not been set (via -Xms), 1889 // synchronize with InitialHeapSize to avoid errors with the default value. 1890 if (min_heap_size() == 0) { 1891 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1892 if (PrintGCDetails && Verbose) { 1893 // Cannot use gclog_or_tty yet. 1894 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1895 } 1896 } 1897 } 1898 } 1899 1900 // This option inspects the machine and attempts to set various 1901 // parameters to be optimal for long-running, memory allocation 1902 // intensive jobs. It is intended for machines with large 1903 // amounts of cpu and memory. 1904 jint Arguments::set_aggressive_heap_flags() { 1905 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1906 // VM, but we may not be able to represent the total physical memory 1907 // available (like having 8gb of memory on a box but using a 32bit VM). 1908 // Thus, we need to make sure we're using a julong for intermediate 1909 // calculations. 1910 julong initHeapSize; 1911 julong total_memory = os::physical_memory(); 1912 1913 if (total_memory < (julong) 256 * M) { 1914 jio_fprintf(defaultStream::error_stream(), 1915 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1916 vm_exit(1); 1917 } 1918 1919 // The heap size is half of available memory, or (at most) 1920 // all of possible memory less 160mb (leaving room for the OS 1921 // when using ISM). This is the maximum; because adaptive sizing 1922 // is turned on below, the actual space used may be smaller. 1923 1924 initHeapSize = MIN2(total_memory / (julong) 2, 1925 total_memory - (julong) 160 * M); 1926 1927 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1928 1929 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1930 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 1931 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 1932 // Currently the minimum size and the initial heap sizes are the same. 1933 set_min_heap_size(initHeapSize); 1934 } 1935 if (FLAG_IS_DEFAULT(NewSize)) { 1936 // Make the young generation 3/8ths of the total heap. 1937 FLAG_SET_CMDLINE(uintx, NewSize, 1938 ((julong) MaxHeapSize / (julong) 8) * (julong) 3); 1939 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 1940 } 1941 1942 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 1943 FLAG_SET_DEFAULT(UseLargePages, true); 1944 #endif 1945 1946 // Increase some data structure sizes for efficiency 1947 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 1948 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 1949 FLAG_SET_CMDLINE(uintx, TLABSize, 256 * K); 1950 1951 // See the OldPLABSize comment below, but replace 'after promotion' 1952 // with 'after copying'. YoungPLABSize is the size of the survivor 1953 // space per-gc-thread buffers. The default is 4kw. 1954 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256 * K); // Note: this is in words 1955 1956 // OldPLABSize is the size of the buffers in the old gen that 1957 // UseParallelGC uses to promote live data that doesn't fit in the 1958 // survivor spaces. At any given time, there's one for each gc thread. 1959 // The default size is 1kw. These buffers are rarely used, since the 1960 // survivor spaces are usually big enough. For specjbb, however, there 1961 // are occasions when there's lots of live data in the young gen 1962 // and we end up promoting some of it. We don't have a definite 1963 // explanation for why bumping OldPLABSize helps, but the theory 1964 // is that a bigger PLAB results in retaining something like the 1965 // original allocation order after promotion, which improves mutator 1966 // locality. A minor effect may be that larger PLABs reduce the 1967 // number of PLAB allocation events during gc. The value of 8kw 1968 // was arrived at by experimenting with specjbb. 1969 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8 * K); // Note: this is in words 1970 1971 // Enable parallel GC and adaptive generation sizing 1972 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 1973 1974 // Encourage steady state memory management 1975 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 1976 1977 // This appears to improve mutator locality 1978 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1979 1980 // Get around early Solaris scheduling bug 1981 // (affinity vs other jobs on system) 1982 // but disallow DR and offlining (5008695). 1983 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 1984 1985 return JNI_OK; 1986 } 1987 1988 // This must be called after ergonomics because we want bytecode rewriting 1989 // if the server compiler is used, or if UseSharedSpaces is disabled. 1990 void Arguments::set_bytecode_flags() { 1991 // Better not attempt to store into a read-only space. 1992 if (UseSharedSpaces) { 1993 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1994 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1995 } 1996 1997 if (!RewriteBytecodes) { 1998 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1999 } 2000 } 2001 2002 // Aggressive optimization flags -XX:+AggressiveOpts 2003 void Arguments::set_aggressive_opts_flags() { 2004 #ifdef COMPILER2 2005 if (AggressiveUnboxing) { 2006 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2007 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2008 } else if (!EliminateAutoBox) { 2009 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2010 AggressiveUnboxing = false; 2011 } 2012 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2013 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2014 } else if (!DoEscapeAnalysis) { 2015 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2016 AggressiveUnboxing = false; 2017 } 2018 } 2019 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2020 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2021 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2022 } 2023 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2024 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2025 } 2026 2027 // Feed the cache size setting into the JDK 2028 char buffer[1024]; 2029 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2030 add_property(buffer); 2031 } 2032 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2033 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2034 } 2035 #endif 2036 2037 if (AggressiveOpts) { 2038 // Sample flag setting code 2039 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2040 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2041 // } 2042 } 2043 } 2044 2045 //=========================================================================================================== 2046 // Parsing of java.compiler property 2047 2048 void Arguments::process_java_compiler_argument(char* arg) { 2049 // For backwards compatibility, Djava.compiler=NONE or "" 2050 // causes us to switch to -Xint mode UNLESS -Xdebug 2051 // is also specified. 2052 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2053 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2054 } 2055 } 2056 2057 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2058 _sun_java_launcher = strdup(launcher); 2059 if (strcmp("gamma", _sun_java_launcher) == 0) { 2060 _created_by_gamma_launcher = true; 2061 } 2062 } 2063 2064 bool Arguments::created_by_java_launcher() { 2065 assert(_sun_java_launcher != NULL, "property must have value"); 2066 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2067 } 2068 2069 bool Arguments::created_by_gamma_launcher() { 2070 return _created_by_gamma_launcher; 2071 } 2072 2073 //=========================================================================================================== 2074 // Parsing of main arguments 2075 2076 bool Arguments::verify_interval(uintx val, uintx min, 2077 uintx max, const char* name) { 2078 // Returns true iff value is in the inclusive interval [min..max] 2079 // false, otherwise. 2080 if (val >= min && val <= max) { 2081 return true; 2082 } 2083 jio_fprintf(defaultStream::error_stream(), 2084 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 2085 " and " UINTX_FORMAT "\n", 2086 name, val, min, max); 2087 return false; 2088 } 2089 2090 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 2091 // Returns true if given value is at least specified min threshold 2092 // false, otherwise. 2093 if (val >= min ) { 2094 return true; 2095 } 2096 jio_fprintf(defaultStream::error_stream(), 2097 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 2098 name, val, min); 2099 return false; 2100 } 2101 2102 bool Arguments::verify_percentage(uintx value, const char* name) { 2103 if (is_percentage(value)) { 2104 return true; 2105 } 2106 jio_fprintf(defaultStream::error_stream(), 2107 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2108 name, value); 2109 return false; 2110 } 2111 2112 // check if do gclog rotation 2113 // +UseGCLogFileRotation is a must, 2114 // no gc log rotation when log file not supplied or 2115 // NumberOfGCLogFiles is 0 2116 void check_gclog_consistency() { 2117 if (UseGCLogFileRotation) { 2118 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2119 jio_fprintf(defaultStream::output_stream(), 2120 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2121 "where num_of_file > 0\n" 2122 "GC log rotation is turned off\n"); 2123 UseGCLogFileRotation = false; 2124 } 2125 } 2126 2127 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2128 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2129 jio_fprintf(defaultStream::output_stream(), 2130 "GCLogFileSize changed to minimum 8K\n"); 2131 } 2132 } 2133 2134 // This function is called for -Xloggc:<filename>, it can be used 2135 // to check if a given file name(or string) conforms to the following 2136 // specification: 2137 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2138 // %p and %t only allowed once. We only limit usage of filename not path 2139 bool is_filename_valid(const char *file_name) { 2140 const char* p = file_name; 2141 char file_sep = os::file_separator()[0]; 2142 const char* cp; 2143 // skip prefix path 2144 for (cp = file_name; *cp != '\0'; cp++) { 2145 if (*cp == '/' || *cp == file_sep) { 2146 p = cp + 1; 2147 } 2148 } 2149 2150 int count_p = 0; 2151 int count_t = 0; 2152 while (*p != '\0') { 2153 if ((*p >= '0' && *p <= '9') || 2154 (*p >= 'A' && *p <= 'Z') || 2155 (*p >= 'a' && *p <= 'z') || 2156 *p == '-' || 2157 *p == '_' || 2158 *p == '.') { 2159 p++; 2160 continue; 2161 } 2162 if (*p == '%') { 2163 if(*(p + 1) == 'p') { 2164 p += 2; 2165 count_p ++; 2166 continue; 2167 } 2168 if (*(p + 1) == 't') { 2169 p += 2; 2170 count_t ++; 2171 continue; 2172 } 2173 } 2174 return false; 2175 } 2176 return count_p < 2 && count_t < 2; 2177 } 2178 2179 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2180 if (!is_percentage(min_heap_free_ratio)) { 2181 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2182 return false; 2183 } 2184 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2185 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2186 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2187 MaxHeapFreeRatio); 2188 return false; 2189 } 2190 // This does not set the flag itself, but stores the value in a safe place for later usage. 2191 _min_heap_free_ratio = min_heap_free_ratio; 2192 return true; 2193 } 2194 2195 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2196 if (!is_percentage(max_heap_free_ratio)) { 2197 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2198 return false; 2199 } 2200 if (max_heap_free_ratio < MinHeapFreeRatio) { 2201 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2202 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2203 MinHeapFreeRatio); 2204 return false; 2205 } 2206 // This does not set the flag itself, but stores the value in a safe place for later usage. 2207 _max_heap_free_ratio = max_heap_free_ratio; 2208 return true; 2209 } 2210 2211 // Check consistency of GC selection 2212 bool Arguments::check_gc_consistency() { 2213 check_gclog_consistency(); 2214 bool status = true; 2215 // Ensure that the user has not selected conflicting sets 2216 // of collectors. [Note: this check is merely a user convenience; 2217 // collectors over-ride each other so that only a non-conflicting 2218 // set is selected; however what the user gets is not what they 2219 // may have expected from the combination they asked for. It's 2220 // better to reduce user confusion by not allowing them to 2221 // select conflicting combinations. 2222 uint i = 0; 2223 if (UseSerialGC) i++; 2224 if (UseConcMarkSweepGC || UseParNewGC) i++; 2225 if (UseParallelGC || UseParallelOldGC) i++; 2226 if (UseG1GC) i++; 2227 if (i > 1) { 2228 jio_fprintf(defaultStream::error_stream(), 2229 "Conflicting collector combinations in option list; " 2230 "please refer to the release notes for the combinations " 2231 "allowed\n"); 2232 status = false; 2233 } 2234 return status; 2235 } 2236 2237 void Arguments::check_deprecated_gcs() { 2238 if (UseConcMarkSweepGC && !UseParNewGC) { 2239 warning("Using the DefNew young collector with the CMS collector is deprecated " 2240 "and will likely be removed in a future release"); 2241 } 2242 2243 if (UseParNewGC && !UseConcMarkSweepGC) { 2244 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2245 // set up UseSerialGC properly, so that can't be used in the check here. 2246 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2247 "and will likely be removed in a future release"); 2248 } 2249 2250 if (CMSIncrementalMode) { 2251 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2252 } 2253 } 2254 2255 void Arguments::check_deprecated_gc_flags() { 2256 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2257 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2258 "and will likely be removed in future release"); 2259 } 2260 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2261 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2262 "Use MaxRAMFraction instead."); 2263 } 2264 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2265 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2266 } 2267 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2268 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2269 } 2270 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2271 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2272 } 2273 } 2274 2275 // Check stack pages settings 2276 bool Arguments::check_stack_pages() 2277 { 2278 bool status = true; 2279 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2280 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2281 // greater stack shadow pages can't generate instruction to bang stack 2282 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2283 return status; 2284 } 2285 2286 // Check the consistency of vm_init_args 2287 bool Arguments::check_vm_args_consistency() { 2288 // Method for adding checks for flag consistency. 2289 // The intent is to warn the user of all possible conflicts, 2290 // before returning an error. 2291 // Note: Needs platform-dependent factoring. 2292 bool status = true; 2293 2294 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 2295 // builds so the cost of stack banging can be measured. 2296 #if (defined(PRODUCT) && defined(SOLARIS)) 2297 if (!UseBoundThreads && !UseStackBanging) { 2298 jio_fprintf(defaultStream::error_stream(), 2299 "-UseStackBanging conflicts with -UseBoundThreads\n"); 2300 2301 status = false; 2302 } 2303 #endif 2304 2305 if (TLABRefillWasteFraction == 0) { 2306 jio_fprintf(defaultStream::error_stream(), 2307 "TLABRefillWasteFraction should be a denominator, " 2308 "not " SIZE_FORMAT "\n", 2309 TLABRefillWasteFraction); 2310 status = false; 2311 } 2312 2313 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2314 "AdaptiveSizePolicyWeight"); 2315 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2316 2317 // Divide by bucket size to prevent a large size from causing rollover when 2318 // calculating amount of memory needed to be allocated for the String table. 2319 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2320 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2321 2322 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2323 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2324 2325 { 2326 // Using "else if" below to avoid printing two error messages if min > max. 2327 // This will also prevent us from reporting both min>100 and max>100 at the 2328 // same time, but that is less annoying than printing two identical errors IMHO. 2329 FormatBuffer<80> err_msg("%s",""); 2330 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2331 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2332 status = false; 2333 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2334 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2335 status = false; 2336 } 2337 } 2338 2339 // Min/MaxMetaspaceFreeRatio 2340 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2341 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2342 2343 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2344 jio_fprintf(defaultStream::error_stream(), 2345 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2346 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2347 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2348 MinMetaspaceFreeRatio, 2349 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2350 MaxMetaspaceFreeRatio); 2351 status = false; 2352 } 2353 2354 // Trying to keep 100% free is not practical 2355 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2356 2357 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2358 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2359 } 2360 2361 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2362 // Settings to encourage splitting. 2363 if (!FLAG_IS_CMDLINE(NewRatio)) { 2364 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2365 } 2366 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2367 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2368 } 2369 } 2370 2371 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2372 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2373 if (GCTimeLimit == 100) { 2374 // Turn off gc-overhead-limit-exceeded checks 2375 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2376 } 2377 2378 status = status && check_gc_consistency(); 2379 status = status && check_stack_pages(); 2380 2381 if (CMSIncrementalMode) { 2382 if (!UseConcMarkSweepGC) { 2383 jio_fprintf(defaultStream::error_stream(), 2384 "error: invalid argument combination.\n" 2385 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2386 "selected in order\nto use CMSIncrementalMode.\n"); 2387 status = false; 2388 } else { 2389 status = status && verify_percentage(CMSIncrementalDutyCycle, 2390 "CMSIncrementalDutyCycle"); 2391 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2392 "CMSIncrementalDutyCycleMin"); 2393 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2394 "CMSIncrementalSafetyFactor"); 2395 status = status && verify_percentage(CMSIncrementalOffset, 2396 "CMSIncrementalOffset"); 2397 status = status && verify_percentage(CMSExpAvgFactor, 2398 "CMSExpAvgFactor"); 2399 // If it was not set on the command line, set 2400 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2401 if (CMSInitiatingOccupancyFraction < 0) { 2402 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2403 } 2404 } 2405 } 2406 2407 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2408 // insists that we hold the requisite locks so that the iteration is 2409 // MT-safe. For the verification at start-up and shut-down, we don't 2410 // yet have a good way of acquiring and releasing these locks, 2411 // which are not visible at the CollectedHeap level. We want to 2412 // be able to acquire these locks and then do the iteration rather 2413 // than just disable the lock verification. This will be fixed under 2414 // bug 4788986. 2415 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2416 if (VerifyDuringStartup) { 2417 warning("Heap verification at start-up disabled " 2418 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2419 VerifyDuringStartup = false; // Disable verification at start-up 2420 } 2421 2422 if (VerifyBeforeExit) { 2423 warning("Heap verification at shutdown disabled " 2424 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2425 VerifyBeforeExit = false; // Disable verification at shutdown 2426 } 2427 } 2428 2429 // Note: only executed in non-PRODUCT mode 2430 if (!UseAsyncConcMarkSweepGC && 2431 (ExplicitGCInvokesConcurrent || 2432 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2433 jio_fprintf(defaultStream::error_stream(), 2434 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2435 " with -UseAsyncConcMarkSweepGC"); 2436 status = false; 2437 } 2438 2439 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2440 2441 #if INCLUDE_ALL_GCS 2442 if (UseG1GC) { 2443 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2444 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2445 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2446 2447 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2448 "InitiatingHeapOccupancyPercent"); 2449 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2450 "G1RefProcDrainInterval"); 2451 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2452 "G1ConcMarkStepDurationMillis"); 2453 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2454 "G1ConcRSHotCardLimit"); 2455 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 27, 2456 "G1ConcRSLogCacheSize"); 2457 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2458 "StringDeduplicationAgeThreshold"); 2459 } 2460 if (UseConcMarkSweepGC) { 2461 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2462 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2463 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2464 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2465 2466 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2467 2468 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2469 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2470 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2471 2472 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2473 2474 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2475 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2476 2477 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2478 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2479 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2480 2481 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2482 2483 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2484 2485 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2486 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2487 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2488 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2489 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2490 } 2491 2492 if (UseParallelGC || UseParallelOldGC) { 2493 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2494 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2495 2496 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2497 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2498 2499 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2500 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2501 2502 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2503 2504 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2505 } 2506 #endif // INCLUDE_ALL_GCS 2507 2508 status = status && verify_interval(RefDiscoveryPolicy, 2509 ReferenceProcessor::DiscoveryPolicyMin, 2510 ReferenceProcessor::DiscoveryPolicyMax, 2511 "RefDiscoveryPolicy"); 2512 2513 // Limit the lower bound of this flag to 1 as it is used in a division 2514 // expression. 2515 status = status && verify_interval(TLABWasteTargetPercent, 2516 1, 100, "TLABWasteTargetPercent"); 2517 2518 status = status && verify_object_alignment(); 2519 2520 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2521 "CompressedClassSpaceSize"); 2522 2523 status = status && verify_interval(MarkStackSizeMax, 2524 1, (max_jint - 1), "MarkStackSizeMax"); 2525 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2526 2527 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2528 2529 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2530 2531 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2532 2533 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2534 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2535 2536 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2537 2538 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2539 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2540 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2541 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2542 2543 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2544 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2545 2546 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2547 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2548 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2549 2550 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2551 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2552 2553 // the "age" field in the oop header is 4 bits; do not want to pull in markOop.hpp 2554 // just for that, so hardcode here. 2555 status = status && verify_interval(MaxTenuringThreshold, 0, 15, "MaxTenuringThreshold"); 2556 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "MaxTenuringThreshold"); 2557 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2558 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2559 2560 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2561 #ifdef COMPILER1 2562 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2563 #endif 2564 2565 if (PrintNMTStatistics) { 2566 #if INCLUDE_NMT 2567 if (MemTracker::tracking_level() == NMT_off) { 2568 #endif // INCLUDE_NMT 2569 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2570 PrintNMTStatistics = false; 2571 #if INCLUDE_NMT 2572 } 2573 #endif 2574 } 2575 2576 // Need to limit the extent of the padding to reasonable size. 2577 // 8K is well beyond the reasonable HW cache line size, even with the 2578 // aggressive prefetching, while still leaving the room for segregating 2579 // among the distinct pages. 2580 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2581 jio_fprintf(defaultStream::error_stream(), 2582 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2583 ContendedPaddingWidth, 0, 8192); 2584 status = false; 2585 } 2586 2587 // Need to enforce the padding not to break the existing field alignments. 2588 // It is sufficient to check against the largest type size. 2589 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2590 jio_fprintf(defaultStream::error_stream(), 2591 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2592 ContendedPaddingWidth, BytesPerLong); 2593 status = false; 2594 } 2595 2596 // Check lower bounds of the code cache 2597 // Template Interpreter code is approximately 3X larger in debug builds. 2598 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2599 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2600 jio_fprintf(defaultStream::error_stream(), 2601 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2602 os::vm_page_size()/K); 2603 status = false; 2604 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2605 jio_fprintf(defaultStream::error_stream(), 2606 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2607 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2608 status = false; 2609 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2610 jio_fprintf(defaultStream::error_stream(), 2611 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2612 min_code_cache_size/K); 2613 status = false; 2614 } else if (ReservedCodeCacheSize > 2*G) { 2615 // Code cache size larger than MAXINT is not supported. 2616 jio_fprintf(defaultStream::error_stream(), 2617 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2618 (2*G)/M); 2619 status = false; 2620 } 2621 2622 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2623 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2624 2625 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2626 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2627 } 2628 2629 #ifdef COMPILER1 2630 status &= verify_interval(SafepointPollOffset, 0, os::vm_page_size() - BytesPerWord, "SafepointPollOffset"); 2631 #endif 2632 2633 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2634 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2635 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2636 // Check the minimum number of compiler threads 2637 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2638 2639 return status; 2640 } 2641 2642 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2643 const char* option_type) { 2644 if (ignore) return false; 2645 2646 const char* spacer = " "; 2647 if (option_type == NULL) { 2648 option_type = ++spacer; // Set both to the empty string. 2649 } 2650 2651 if (os::obsolete_option(option)) { 2652 jio_fprintf(defaultStream::error_stream(), 2653 "Obsolete %s%soption: %s\n", option_type, spacer, 2654 option->optionString); 2655 return false; 2656 } else { 2657 jio_fprintf(defaultStream::error_stream(), 2658 "Unrecognized %s%soption: %s\n", option_type, spacer, 2659 option->optionString); 2660 return true; 2661 } 2662 } 2663 2664 static const char* user_assertion_options[] = { 2665 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2666 }; 2667 2668 static const char* system_assertion_options[] = { 2669 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2670 }; 2671 2672 // Return true if any of the strings in null-terminated array 'names' matches. 2673 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2674 // the option must match exactly. 2675 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2676 bool tail_allowed) { 2677 for (/* empty */; *names != NULL; ++names) { 2678 if (match_option(option, *names, tail)) { 2679 if (**tail == '\0' || tail_allowed && **tail == ':') { 2680 return true; 2681 } 2682 } 2683 } 2684 return false; 2685 } 2686 2687 bool Arguments::parse_uintx(const char* value, 2688 uintx* uintx_arg, 2689 uintx min_size) { 2690 2691 // Check the sign first since atomull() parses only unsigned values. 2692 bool value_is_positive = !(*value == '-'); 2693 2694 if (value_is_positive) { 2695 julong n; 2696 bool good_return = atomull(value, &n); 2697 if (good_return) { 2698 bool above_minimum = n >= min_size; 2699 bool value_is_too_large = n > max_uintx; 2700 2701 if (above_minimum && !value_is_too_large) { 2702 *uintx_arg = n; 2703 return true; 2704 } 2705 } 2706 } 2707 return false; 2708 } 2709 2710 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2711 julong* long_arg, 2712 julong min_size) { 2713 if (!atomull(s, long_arg)) return arg_unreadable; 2714 return check_memory_size(*long_arg, min_size); 2715 } 2716 2717 // Parse JavaVMInitArgs structure 2718 2719 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2720 // For components of the system classpath. 2721 SysClassPath scp(Arguments::get_sysclasspath()); 2722 bool scp_assembly_required = false; 2723 2724 // Save default settings for some mode flags 2725 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2726 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2727 Arguments::_ClipInlining = ClipInlining; 2728 Arguments::_BackgroundCompilation = BackgroundCompilation; 2729 2730 // Setup flags for mixed which is the default 2731 set_mode_flags(_mixed); 2732 2733 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2734 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2735 if (result != JNI_OK) { 2736 return result; 2737 } 2738 2739 // Parse JavaVMInitArgs structure passed in 2740 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2741 if (result != JNI_OK) { 2742 return result; 2743 } 2744 2745 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2746 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2747 if (result != JNI_OK) { 2748 return result; 2749 } 2750 2751 // We need to ensure processor and memory resources have been properly 2752 // configured - which may rely on arguments we just processed - before 2753 // doing the final argument processing. Any argument processing that 2754 // needs to know about processor and memory resources must occur after 2755 // this point. 2756 2757 os::init_container_support(); 2758 2759 // Do final processing now that all arguments have been parsed 2760 result = finalize_vm_init_args(&scp, scp_assembly_required); 2761 if (result != JNI_OK) { 2762 return result; 2763 } 2764 2765 return JNI_OK; 2766 } 2767 2768 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2769 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2770 // are dealing with -agentpath (case where name is a path), otherwise with 2771 // -agentlib 2772 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2773 char *_name; 2774 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2775 size_t _len_hprof, _len_jdwp, _len_prefix; 2776 2777 if (is_path) { 2778 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2779 return false; 2780 } 2781 2782 _name++; // skip past last path separator 2783 _len_prefix = strlen(JNI_LIB_PREFIX); 2784 2785 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2786 return false; 2787 } 2788 2789 _name += _len_prefix; 2790 _len_hprof = strlen(_hprof); 2791 _len_jdwp = strlen(_jdwp); 2792 2793 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2794 _name += _len_hprof; 2795 } 2796 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2797 _name += _len_jdwp; 2798 } 2799 else { 2800 return false; 2801 } 2802 2803 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2804 return false; 2805 } 2806 2807 return true; 2808 } 2809 2810 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2811 return true; 2812 } 2813 2814 return false; 2815 } 2816 2817 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2818 SysClassPath* scp_p, 2819 bool* scp_assembly_required_p, 2820 Flag::Flags origin) { 2821 // Remaining part of option string 2822 const char* tail; 2823 2824 // iterate over arguments 2825 for (int index = 0; index < args->nOptions; index++) { 2826 bool is_absolute_path = false; // for -agentpath vs -agentlib 2827 2828 const JavaVMOption* option = args->options + index; 2829 2830 if (!match_option(option, "-Djava.class.path", &tail) && 2831 !match_option(option, "-Dsun.java.command", &tail) && 2832 !match_option(option, "-Dsun.java.launcher", &tail)) { 2833 2834 // add all jvm options to the jvm_args string. This string 2835 // is used later to set the java.vm.args PerfData string constant. 2836 // the -Djava.class.path and the -Dsun.java.command options are 2837 // omitted from jvm_args string as each have their own PerfData 2838 // string constant object. 2839 build_jvm_args(option->optionString); 2840 } 2841 2842 // -verbose:[class/gc/jni] 2843 if (match_option(option, "-verbose", &tail)) { 2844 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2845 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2846 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2847 } else if (!strcmp(tail, ":gc")) { 2848 FLAG_SET_CMDLINE(bool, PrintGC, true); 2849 } else if (!strcmp(tail, ":jni")) { 2850 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2851 } 2852 // -da / -ea / -disableassertions / -enableassertions 2853 // These accept an optional class/package name separated by a colon, e.g., 2854 // -da:java.lang.Thread. 2855 } else if (match_option(option, user_assertion_options, &tail, true)) { 2856 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2857 if (*tail == '\0') { 2858 JavaAssertions::setUserClassDefault(enable); 2859 } else { 2860 assert(*tail == ':', "bogus match by match_option()"); 2861 JavaAssertions::addOption(tail + 1, enable); 2862 } 2863 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2864 } else if (match_option(option, system_assertion_options, &tail, false)) { 2865 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2866 JavaAssertions::setSystemClassDefault(enable); 2867 // -bootclasspath: 2868 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2869 scp_p->reset_path(tail); 2870 *scp_assembly_required_p = true; 2871 // -bootclasspath/a: 2872 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2873 scp_p->add_suffix(tail); 2874 *scp_assembly_required_p = true; 2875 // -bootclasspath/p: 2876 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2877 scp_p->add_prefix(tail); 2878 *scp_assembly_required_p = true; 2879 // -Xrun 2880 } else if (match_option(option, "-Xrun", &tail)) { 2881 if (tail != NULL) { 2882 const char* pos = strchr(tail, ':'); 2883 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2884 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2885 name[len] = '\0'; 2886 2887 char *options = NULL; 2888 if(pos != NULL) { 2889 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2890 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2891 } 2892 #if !INCLUDE_JVMTI 2893 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2894 jio_fprintf(defaultStream::error_stream(), 2895 "Profiling and debugging agents are not supported in this VM\n"); 2896 return JNI_ERR; 2897 } 2898 #endif // !INCLUDE_JVMTI 2899 add_init_library(name, options); 2900 } 2901 // -agentlib and -agentpath 2902 } else if (match_option(option, "-agentlib:", &tail) || 2903 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2904 if(tail != NULL) { 2905 const char* pos = strchr(tail, '='); 2906 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2907 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2908 name[len] = '\0'; 2909 2910 char *options = NULL; 2911 if(pos != NULL) { 2912 size_t length = strlen(pos + 1) + 1; 2913 options = NEW_C_HEAP_ARRAY(char, length, mtInternal); 2914 jio_snprintf(options, length, "%s", pos + 1); 2915 } 2916 #if !INCLUDE_JVMTI 2917 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2918 jio_fprintf(defaultStream::error_stream(), 2919 "Profiling and debugging agents are not supported in this VM\n"); 2920 return JNI_ERR; 2921 } 2922 #endif // !INCLUDE_JVMTI 2923 add_init_agent(name, options, is_absolute_path); 2924 } 2925 // -javaagent 2926 } else if (match_option(option, "-javaagent:", &tail)) { 2927 #if !INCLUDE_JVMTI 2928 jio_fprintf(defaultStream::error_stream(), 2929 "Instrumentation agents are not supported in this VM\n"); 2930 return JNI_ERR; 2931 #else 2932 if(tail != NULL) { 2933 size_t length = strlen(tail) + 1; 2934 char *options = NEW_C_HEAP_ARRAY(char, length, mtInternal); 2935 jio_snprintf(options, length, "%s", tail); 2936 add_init_agent("instrument", options, false); 2937 } 2938 #endif // !INCLUDE_JVMTI 2939 // -Xnoclassgc 2940 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2941 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2942 // -Xincgc: i-CMS 2943 } else if (match_option(option, "-Xincgc", &tail)) { 2944 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2945 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2946 // -Xnoincgc: no i-CMS 2947 } else if (match_option(option, "-Xnoincgc", &tail)) { 2948 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2949 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2950 // -Xconcgc 2951 } else if (match_option(option, "-Xconcgc", &tail)) { 2952 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2953 // -Xnoconcgc 2954 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2955 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2956 // -Xbatch 2957 } else if (match_option(option, "-Xbatch", &tail)) { 2958 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2959 // -Xmn for compatibility with other JVM vendors 2960 } else if (match_option(option, "-Xmn", &tail)) { 2961 julong long_initial_young_size = 0; 2962 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2963 if (errcode != arg_in_range) { 2964 jio_fprintf(defaultStream::error_stream(), 2965 "Invalid initial young generation size: %s\n", option->optionString); 2966 describe_range_error(errcode); 2967 return JNI_EINVAL; 2968 } 2969 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2970 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2971 // -Xms 2972 } else if (match_option(option, "-Xms", &tail)) { 2973 julong long_initial_heap_size = 0; 2974 // an initial heap size of 0 means automatically determine 2975 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2976 if (errcode != arg_in_range) { 2977 jio_fprintf(defaultStream::error_stream(), 2978 "Invalid initial heap size: %s\n", option->optionString); 2979 describe_range_error(errcode); 2980 return JNI_EINVAL; 2981 } 2982 set_min_heap_size((uintx)long_initial_heap_size); 2983 // Currently the minimum size and the initial heap sizes are the same. 2984 // Can be overridden with -XX:InitialHeapSize. 2985 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2986 // -Xmx 2987 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2988 julong long_max_heap_size = 0; 2989 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2990 if (errcode != arg_in_range) { 2991 jio_fprintf(defaultStream::error_stream(), 2992 "Invalid maximum heap size: %s\n", option->optionString); 2993 describe_range_error(errcode); 2994 return JNI_EINVAL; 2995 } 2996 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2997 // Xmaxf 2998 } else if (match_option(option, "-Xmaxf", &tail)) { 2999 char* err; 3000 int maxf = (int)(strtod(tail, &err) * 100); 3001 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 3002 jio_fprintf(defaultStream::error_stream(), 3003 "Bad max heap free percentage size: %s\n", 3004 option->optionString); 3005 return JNI_EINVAL; 3006 } else { 3007 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 3008 } 3009 // Xminf 3010 } else if (match_option(option, "-Xminf", &tail)) { 3011 char* err; 3012 int minf = (int)(strtod(tail, &err) * 100); 3013 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 3014 jio_fprintf(defaultStream::error_stream(), 3015 "Bad min heap free percentage size: %s\n", 3016 option->optionString); 3017 return JNI_EINVAL; 3018 } else { 3019 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 3020 } 3021 // -Xss 3022 } else if (match_option(option, "-Xss", &tail)) { 3023 julong long_ThreadStackSize = 0; 3024 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3025 if (errcode != arg_in_range) { 3026 jio_fprintf(defaultStream::error_stream(), 3027 "Invalid thread stack size: %s\n", option->optionString); 3028 describe_range_error(errcode); 3029 return JNI_EINVAL; 3030 } 3031 // Internally track ThreadStackSize in units of 1024 bytes. 3032 FLAG_SET_CMDLINE(intx, ThreadStackSize, 3033 round_to((int)long_ThreadStackSize, K) / K); 3034 // -Xoss 3035 } else if (match_option(option, "-Xoss", &tail)) { 3036 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 3037 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3038 julong long_CodeCacheExpansionSize = 0; 3039 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3040 if (errcode != arg_in_range) { 3041 jio_fprintf(defaultStream::error_stream(), 3042 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3043 os::vm_page_size()/K); 3044 return JNI_EINVAL; 3045 } 3046 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 3047 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3048 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3049 julong long_ReservedCodeCacheSize = 0; 3050 3051 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3052 if (errcode != arg_in_range) { 3053 jio_fprintf(defaultStream::error_stream(), 3054 "Invalid maximum code cache size: %s.\n", option->optionString); 3055 return JNI_EINVAL; 3056 } 3057 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 3058 //-XX:IncreaseFirstTierCompileThresholdAt= 3059 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 3060 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 3061 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 3062 jio_fprintf(defaultStream::error_stream(), 3063 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 3064 option->optionString); 3065 return JNI_EINVAL; 3066 } 3067 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 3068 // -green 3069 } else if (match_option(option, "-green", &tail)) { 3070 jio_fprintf(defaultStream::error_stream(), 3071 "Green threads support not available\n"); 3072 return JNI_EINVAL; 3073 // -native 3074 } else if (match_option(option, "-native", &tail)) { 3075 // HotSpot always uses native threads, ignore silently for compatibility 3076 // -Xsqnopause 3077 } else if (match_option(option, "-Xsqnopause", &tail)) { 3078 // EVM option, ignore silently for compatibility 3079 // -Xrs 3080 } else if (match_option(option, "-Xrs", &tail)) { 3081 // Classic/EVM option, new functionality 3082 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 3083 } else if (match_option(option, "-Xusealtsigs", &tail)) { 3084 // change default internal VM signals used - lower case for back compat 3085 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 3086 // -Xoptimize 3087 } else if (match_option(option, "-Xoptimize", &tail)) { 3088 // EVM option, ignore silently for compatibility 3089 // -Xprof 3090 } else if (match_option(option, "-Xprof", &tail)) { 3091 #if INCLUDE_FPROF 3092 _has_profile = true; 3093 #else // INCLUDE_FPROF 3094 jio_fprintf(defaultStream::error_stream(), 3095 "Flat profiling is not supported in this VM.\n"); 3096 return JNI_ERR; 3097 #endif // INCLUDE_FPROF 3098 // -Xconcurrentio 3099 } else if (match_option(option, "-Xconcurrentio", &tail)) { 3100 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 3101 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 3102 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 3103 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3104 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 3105 3106 // -Xinternalversion 3107 } else if (match_option(option, "-Xinternalversion", &tail)) { 3108 jio_fprintf(defaultStream::output_stream(), "%s\n", 3109 VM_Version::internal_vm_info_string()); 3110 vm_exit(0); 3111 #ifndef PRODUCT 3112 // -Xprintflags 3113 } else if (match_option(option, "-Xprintflags", &tail)) { 3114 CommandLineFlags::printFlags(tty, false); 3115 vm_exit(0); 3116 #endif 3117 // -D 3118 } else if (match_option(option, "-D", &tail)) { 3119 if (CheckEndorsedAndExtDirs) { 3120 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) { 3121 // abort if -Djava.endorsed.dirs is set 3122 jio_fprintf(defaultStream::output_stream(), 3123 "-Djava.endorsed.dirs will not be supported in a future release.\n" 3124 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n"); 3125 return JNI_EINVAL; 3126 } 3127 if (match_option(option, "-Djava.ext.dirs=", &tail)) { 3128 // abort if -Djava.ext.dirs is set 3129 jio_fprintf(defaultStream::output_stream(), 3130 "-Djava.ext.dirs will not be supported in a future release.\n" 3131 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n"); 3132 return JNI_EINVAL; 3133 } 3134 } 3135 3136 if (!add_property(tail)) { 3137 return JNI_ENOMEM; 3138 } 3139 // Out of the box management support 3140 if (match_option(option, "-Dcom.sun.management", &tail)) { 3141 #if INCLUDE_MANAGEMENT 3142 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3143 #else 3144 jio_fprintf(defaultStream::output_stream(), 3145 "-Dcom.sun.management is not supported in this VM.\n"); 3146 return JNI_ERR; 3147 #endif 3148 } 3149 // -Xint 3150 } else if (match_option(option, "-Xint", &tail)) { 3151 set_mode_flags(_int); 3152 // -Xmixed 3153 } else if (match_option(option, "-Xmixed", &tail)) { 3154 set_mode_flags(_mixed); 3155 // -Xcomp 3156 } else if (match_option(option, "-Xcomp", &tail)) { 3157 // for testing the compiler; turn off all flags that inhibit compilation 3158 set_mode_flags(_comp); 3159 // -Xshare:dump 3160 } else if (match_option(option, "-Xshare:dump", &tail)) { 3161 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3162 set_mode_flags(_int); // Prevent compilation, which creates objects 3163 // -Xshare:on 3164 } else if (match_option(option, "-Xshare:on", &tail)) { 3165 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3166 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3167 // -Xshare:auto 3168 } else if (match_option(option, "-Xshare:auto", &tail)) { 3169 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3170 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3171 // -Xshare:off 3172 } else if (match_option(option, "-Xshare:off", &tail)) { 3173 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3174 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3175 // -Xverify 3176 } else if (match_option(option, "-Xverify", &tail)) { 3177 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3178 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3179 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3180 } else if (strcmp(tail, ":remote") == 0) { 3181 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3182 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3183 } else if (strcmp(tail, ":none") == 0) { 3184 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3185 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3186 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3187 return JNI_EINVAL; 3188 } 3189 // -Xdebug 3190 } else if (match_option(option, "-Xdebug", &tail)) { 3191 // note this flag has been used, then ignore 3192 set_xdebug_mode(true); 3193 // -Xnoagent 3194 } else if (match_option(option, "-Xnoagent", &tail)) { 3195 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3196 } else if (match_option(option, "-Xboundthreads", &tail)) { 3197 // Bind user level threads to kernel threads (Solaris only) 3198 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3199 } else if (match_option(option, "-Xloggc:", &tail)) { 3200 // Redirect GC output to the file. -Xloggc:<filename> 3201 // ostream_init_log(), when called will use this filename 3202 // to initialize a fileStream. 3203 _gc_log_filename = strdup(tail); 3204 if (!is_filename_valid(_gc_log_filename)) { 3205 jio_fprintf(defaultStream::output_stream(), 3206 "Invalid file name for use with -Xloggc: Filename can only contain the " 3207 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3208 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3209 return JNI_EINVAL; 3210 } 3211 FLAG_SET_CMDLINE(bool, PrintGC, true); 3212 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3213 3214 // JNI hooks 3215 } else if (match_option(option, "-Xcheck", &tail)) { 3216 if (!strcmp(tail, ":jni")) { 3217 #if !INCLUDE_JNI_CHECK 3218 warning("JNI CHECKING is not supported in this VM"); 3219 #else 3220 CheckJNICalls = true; 3221 #endif // INCLUDE_JNI_CHECK 3222 } else if (is_bad_option(option, args->ignoreUnrecognized, 3223 "check")) { 3224 return JNI_EINVAL; 3225 } 3226 } else if (match_option(option, "vfprintf", &tail)) { 3227 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3228 } else if (match_option(option, "exit", &tail)) { 3229 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3230 } else if (match_option(option, "abort", &tail)) { 3231 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3232 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3233 // The last option must always win. 3234 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3235 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3236 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3237 // The last option must always win. 3238 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3239 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3240 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3241 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3242 jio_fprintf(defaultStream::error_stream(), 3243 "Please use CMSClassUnloadingEnabled in place of " 3244 "CMSPermGenSweepingEnabled in the future\n"); 3245 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3246 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3247 jio_fprintf(defaultStream::error_stream(), 3248 "Please use -XX:+UseGCOverheadLimit in place of " 3249 "-XX:+UseGCTimeLimit in the future\n"); 3250 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3251 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3252 jio_fprintf(defaultStream::error_stream(), 3253 "Please use -XX:-UseGCOverheadLimit in place of " 3254 "-XX:-UseGCTimeLimit in the future\n"); 3255 // The TLE options are for compatibility with 1.3 and will be 3256 // removed without notice in a future release. These options 3257 // are not to be documented. 3258 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3259 // No longer used. 3260 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3261 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3262 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3263 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3264 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3265 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3266 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3267 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3268 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3269 // No longer used. 3270 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3271 julong long_tlab_size = 0; 3272 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3273 if (errcode != arg_in_range) { 3274 jio_fprintf(defaultStream::error_stream(), 3275 "Invalid TLAB size: %s\n", option->optionString); 3276 describe_range_error(errcode); 3277 return JNI_EINVAL; 3278 } 3279 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3280 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3281 // No longer used. 3282 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3283 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3284 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3285 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3286 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3287 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3288 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3289 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3290 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3291 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3292 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3293 #if defined(DTRACE_ENABLED) 3294 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3295 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3296 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3297 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3298 #else // defined(DTRACE_ENABLED) 3299 jio_fprintf(defaultStream::error_stream(), 3300 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3301 return JNI_EINVAL; 3302 #endif // defined(DTRACE_ENABLED) 3303 #ifdef ASSERT 3304 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3305 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3306 // disable scavenge before parallel mark-compact 3307 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3308 #endif 3309 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3310 julong cms_blocks_to_claim = (julong)atol(tail); 3311 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3312 jio_fprintf(defaultStream::error_stream(), 3313 "Please use -XX:OldPLABSize in place of " 3314 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3315 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3316 julong cms_blocks_to_claim = (julong)atol(tail); 3317 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3318 jio_fprintf(defaultStream::error_stream(), 3319 "Please use -XX:OldPLABSize in place of " 3320 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3321 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3322 julong old_plab_size = 0; 3323 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3324 if (errcode != arg_in_range) { 3325 jio_fprintf(defaultStream::error_stream(), 3326 "Invalid old PLAB size: %s\n", option->optionString); 3327 describe_range_error(errcode); 3328 return JNI_EINVAL; 3329 } 3330 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3331 jio_fprintf(defaultStream::error_stream(), 3332 "Please use -XX:OldPLABSize in place of " 3333 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3334 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3335 julong young_plab_size = 0; 3336 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3337 if (errcode != arg_in_range) { 3338 jio_fprintf(defaultStream::error_stream(), 3339 "Invalid young PLAB size: %s\n", option->optionString); 3340 describe_range_error(errcode); 3341 return JNI_EINVAL; 3342 } 3343 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3344 jio_fprintf(defaultStream::error_stream(), 3345 "Please use -XX:YoungPLABSize in place of " 3346 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3347 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3348 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3349 julong stack_size = 0; 3350 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3351 if (errcode != arg_in_range) { 3352 jio_fprintf(defaultStream::error_stream(), 3353 "Invalid mark stack size: %s\n", option->optionString); 3354 describe_range_error(errcode); 3355 return JNI_EINVAL; 3356 } 3357 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3358 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3359 julong max_stack_size = 0; 3360 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3361 if (errcode != arg_in_range) { 3362 jio_fprintf(defaultStream::error_stream(), 3363 "Invalid maximum mark stack size: %s\n", 3364 option->optionString); 3365 describe_range_error(errcode); 3366 return JNI_EINVAL; 3367 } 3368 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3369 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3370 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3371 uintx conc_threads = 0; 3372 if (!parse_uintx(tail, &conc_threads, 1)) { 3373 jio_fprintf(defaultStream::error_stream(), 3374 "Invalid concurrent threads: %s\n", option->optionString); 3375 return JNI_EINVAL; 3376 } 3377 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3378 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3379 julong max_direct_memory_size = 0; 3380 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3381 if (errcode != arg_in_range) { 3382 jio_fprintf(defaultStream::error_stream(), 3383 "Invalid maximum direct memory size: %s\n", 3384 option->optionString); 3385 describe_range_error(errcode); 3386 return JNI_EINVAL; 3387 } 3388 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3389 } else if (match_option(option, "-XX:+UseVMInterruptibleIO", &tail)) { 3390 // NOTE! In JDK 9, the UseVMInterruptibleIO flag will completely go 3391 // away and will cause VM initialization failures! 3392 warning("-XX:+UseVMInterruptibleIO is obsolete and will be removed in a future release."); 3393 FLAG_SET_CMDLINE(bool, UseVMInterruptibleIO, true); 3394 #if !INCLUDE_MANAGEMENT 3395 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3396 jio_fprintf(defaultStream::error_stream(), 3397 "ManagementServer is not supported in this VM.\n"); 3398 return JNI_ERR; 3399 #endif // INCLUDE_MANAGEMENT 3400 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3401 // Skip -XX:Flags= since that case has already been handled 3402 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3403 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3404 return JNI_EINVAL; 3405 } 3406 } 3407 // Unknown option 3408 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3409 return JNI_ERR; 3410 } 3411 } 3412 3413 // PrintSharedArchiveAndExit will turn on 3414 // -Xshare:on 3415 // -XX:+TraceClassPaths 3416 if (PrintSharedArchiveAndExit) { 3417 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3418 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3419 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3420 } 3421 3422 // Change the default value for flags which have different default values 3423 // when working with older JDKs. 3424 #ifdef LINUX 3425 if (JDK_Version::current().compare_major(6) <= 0 && 3426 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3427 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3428 } 3429 #endif // LINUX 3430 fix_appclasspath(); 3431 return JNI_OK; 3432 } 3433 3434 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3435 // 3436 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3437 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3438 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3439 // path is treated as the current directory. 3440 // 3441 // This causes problems with CDS, which requires that all directories specified in the classpath 3442 // must be empty. In most cases, applications do NOT want to load classes from the current 3443 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3444 // scripts compatible with CDS. 3445 void Arguments::fix_appclasspath() { 3446 if (IgnoreEmptyClassPaths) { 3447 const char separator = *os::path_separator(); 3448 const char* src = _java_class_path->value(); 3449 3450 // skip over all the leading empty paths 3451 while (*src == separator) { 3452 src ++; 3453 } 3454 3455 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3456 strncpy(copy, src, strlen(src) + 1); 3457 3458 // trim all trailing empty paths 3459 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3460 *tail = '\0'; 3461 } 3462 3463 char from[3] = {separator, separator, '\0'}; 3464 char to [2] = {separator, '\0'}; 3465 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3466 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3467 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3468 } 3469 3470 _java_class_path->set_value(copy); 3471 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3472 } 3473 3474 if (!PrintSharedArchiveAndExit) { 3475 ClassLoader::trace_class_path(tty, "[classpath: ", _java_class_path->value()); 3476 } 3477 } 3478 3479 static bool has_jar_files(const char* directory) { 3480 DIR* dir = os::opendir(directory); 3481 if (dir == NULL) return false; 3482 3483 struct dirent *entry; 3484 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3485 bool hasJarFile = false; 3486 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3487 const char* name = entry->d_name; 3488 const char* ext = name + strlen(name) - 4; 3489 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3490 } 3491 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 3492 os::closedir(dir); 3493 return hasJarFile ; 3494 } 3495 3496 // returns the number of directories in the given path containing JAR files 3497 // If the skip argument is not NULL, it will skip that directory 3498 static int check_non_empty_dirs(const char* path, const char* type, const char* skip) { 3499 const char separator = *os::path_separator(); 3500 const char* const end = path + strlen(path); 3501 int nonEmptyDirs = 0; 3502 while (path < end) { 3503 const char* tmp_end = strchr(path, separator); 3504 if (tmp_end == NULL) { 3505 if ((skip == NULL || strcmp(path, skip) != 0) && has_jar_files(path)) { 3506 nonEmptyDirs++; 3507 jio_fprintf(defaultStream::output_stream(), 3508 "Non-empty %s directory: %s\n", type, path); 3509 } 3510 path = end; 3511 } else { 3512 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3513 memcpy(dirpath, path, tmp_end - path); 3514 dirpath[tmp_end - path] = '\0'; 3515 if ((skip == NULL || strcmp(dirpath, skip) != 0) && has_jar_files(dirpath)) { 3516 nonEmptyDirs++; 3517 jio_fprintf(defaultStream::output_stream(), 3518 "Non-empty %s directory: %s\n", type, dirpath); 3519 } 3520 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 3521 path = tmp_end + 1; 3522 } 3523 } 3524 return nonEmptyDirs; 3525 } 3526 3527 // Returns true if endorsed standards override mechanism and extension mechanism 3528 // are not used. 3529 static bool check_endorsed_and_ext_dirs() { 3530 if (!CheckEndorsedAndExtDirs) 3531 return true; 3532 3533 char endorsedDir[JVM_MAXPATHLEN]; 3534 char extDir[JVM_MAXPATHLEN]; 3535 const char* fileSep = os::file_separator(); 3536 jio_snprintf(endorsedDir, sizeof(endorsedDir), "%s%slib%sendorsed", 3537 Arguments::get_java_home(), fileSep, fileSep); 3538 jio_snprintf(extDir, sizeof(extDir), "%s%slib%sext", 3539 Arguments::get_java_home(), fileSep, fileSep); 3540 3541 // check endorsed directory 3542 int nonEmptyDirs = check_non_empty_dirs(Arguments::get_endorsed_dir(), "endorsed", NULL); 3543 3544 // check the extension directories but skip the default lib/ext directory 3545 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs(), "extension", extDir); 3546 3547 // List of JAR files installed in the default lib/ext directory. 3548 // -XX:+CheckEndorsedAndExtDirs checks if any non-JDK file installed 3549 static const char* jdk_ext_jars[] = { 3550 "access-bridge-32.jar", 3551 "access-bridge-64.jar", 3552 "access-bridge.jar", 3553 "cldrdata.jar", 3554 "dnsns.jar", 3555 "jaccess.jar", 3556 "jfxrt.jar", 3557 "localedata.jar", 3558 "nashorn.jar", 3559 "sunec.jar", 3560 "sunjce_provider.jar", 3561 "sunmscapi.jar", 3562 "sunpkcs11.jar", 3563 "ucrypto.jar", 3564 "zipfs.jar", 3565 NULL 3566 }; 3567 3568 // check if the default lib/ext directory has any non-JDK jar files; if so, error 3569 DIR* dir = os::opendir(extDir); 3570 if (dir != NULL) { 3571 int num_ext_jars = 0; 3572 struct dirent *entry; 3573 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(extDir), mtInternal); 3574 while ((entry = os::readdir(dir, (dirent *) dbuf)) != 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 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 3594 os::closedir(dir); 3595 if (num_ext_jars > 0) { 3596 nonEmptyDirs += 1; 3597 } 3598 } 3599 3600 // check if the default lib/endorsed directory exists; if so, error 3601 dir = os::opendir(endorsedDir); 3602 if (dir != NULL) { 3603 jio_fprintf(defaultStream::output_stream(), "<JAVA_HOME>/lib/endorsed exists\n"); 3604 os::closedir(dir); 3605 nonEmptyDirs += 1; 3606 } 3607 3608 if (nonEmptyDirs > 0) { 3609 jio_fprintf(defaultStream::output_stream(), 3610 "Endorsed standards override mechanism and extension mechanism " 3611 "will not be supported in a future release.\n" 3612 "Refer to JEP 220 for details (http://openjdk.java.net/jeps/220).\n"); 3613 return false; 3614 } 3615 3616 return true; 3617 } 3618 3619 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3620 // This must be done after all -D arguments have been processed. 3621 scp_p->expand_endorsed(); 3622 3623 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3624 // Assemble the bootclasspath elements into the final path. 3625 Arguments::set_sysclasspath(scp_p->combined_path()); 3626 } 3627 3628 if (!check_endorsed_and_ext_dirs()) { 3629 return JNI_ERR; 3630 } 3631 3632 // This must be done after all arguments have been processed 3633 // and the container support has been initialized since AggressiveHeap 3634 // relies on the amount of total memory available. 3635 if (AggressiveHeap) { 3636 jint result = set_aggressive_heap_flags(); 3637 if (result != JNI_OK) { 3638 return result; 3639 } 3640 } 3641 // This must be done after all arguments have been processed. 3642 // java_compiler() true means set to "NONE" or empty. 3643 if (java_compiler() && !xdebug_mode()) { 3644 // For backwards compatibility, we switch to interpreted mode if 3645 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3646 // not specified. 3647 set_mode_flags(_int); 3648 } 3649 if (CompileThreshold == 0) { 3650 set_mode_flags(_int); 3651 } 3652 3653 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3654 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3655 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3656 } 3657 3658 #ifndef COMPILER2 3659 // Don't degrade server performance for footprint 3660 if (FLAG_IS_DEFAULT(UseLargePages) && 3661 MaxHeapSize < LargePageHeapSizeThreshold) { 3662 // No need for large granularity pages w/small heaps. 3663 // Note that large pages are enabled/disabled for both the 3664 // Java heap and the code cache. 3665 FLAG_SET_DEFAULT(UseLargePages, false); 3666 } 3667 3668 #else 3669 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3670 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3671 } 3672 #endif 3673 3674 #ifndef TIERED 3675 // Tiered compilation is undefined. 3676 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3677 #endif 3678 3679 // If we are running in a headless jre, force java.awt.headless property 3680 // to be true unless the property has already been set. 3681 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3682 if (os::is_headless_jre()) { 3683 const char* headless = Arguments::get_property("java.awt.headless"); 3684 if (headless == NULL) { 3685 char envbuffer[128]; 3686 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3687 if (!add_property("java.awt.headless=true")) { 3688 return JNI_ENOMEM; 3689 } 3690 } else { 3691 char buffer[256]; 3692 jio_snprintf(buffer, 256, "java.awt.headless=%s", envbuffer); 3693 if (!add_property(buffer)) { 3694 return JNI_ENOMEM; 3695 } 3696 } 3697 } 3698 } 3699 3700 if (!check_vm_args_consistency()) { 3701 return JNI_ERR; 3702 } 3703 3704 return JNI_OK; 3705 } 3706 3707 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3708 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3709 scp_assembly_required_p); 3710 } 3711 3712 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3713 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3714 scp_assembly_required_p); 3715 } 3716 3717 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3718 const int N_MAX_OPTIONS = 64; 3719 const int OPTION_BUFFER_SIZE = 1024; 3720 char buffer[OPTION_BUFFER_SIZE]; 3721 3722 // The variable will be ignored if it exceeds the length of the buffer. 3723 // Don't check this variable if user has special privileges 3724 // (e.g. unix su command). 3725 if (os::getenv(name, buffer, sizeof(buffer)) && 3726 !os::have_special_privileges()) { 3727 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3728 jio_fprintf(defaultStream::error_stream(), 3729 "Picked up %s: %s\n", name, buffer); 3730 char* rd = buffer; // pointer to the input string (rd) 3731 int i; 3732 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3733 while (isspace(*rd)) rd++; // skip whitespace 3734 if (*rd == 0) break; // we re done when the input string is read completely 3735 3736 // The output, option string, overwrites the input string. 3737 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3738 // input string (rd). 3739 char* wrt = rd; 3740 3741 options[i++].optionString = wrt; // Fill in option 3742 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3743 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3744 int quote = *rd; // matching quote to look for 3745 rd++; // don't copy open quote 3746 while (*rd != quote) { // include everything (even spaces) up until quote 3747 if (*rd == 0) { // string termination means unmatched string 3748 jio_fprintf(defaultStream::error_stream(), 3749 "Unmatched quote in %s\n", name); 3750 return JNI_ERR; 3751 } 3752 *wrt++ = *rd++; // copy to option string 3753 } 3754 rd++; // don't copy close quote 3755 } else { 3756 *wrt++ = *rd++; // copy to option string 3757 } 3758 } 3759 // Need to check if we're done before writing a NULL, 3760 // because the write could be to the byte that rd is pointing to. 3761 if (*rd++ == 0) { 3762 *wrt = 0; 3763 break; 3764 } 3765 *wrt = 0; // Zero terminate option 3766 } 3767 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3768 JavaVMInitArgs vm_args; 3769 vm_args.version = JNI_VERSION_1_2; 3770 vm_args.options = options; 3771 vm_args.nOptions = i; 3772 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3773 3774 if (PrintVMOptions) { 3775 const char* tail; 3776 for (int i = 0; i < vm_args.nOptions; i++) { 3777 const JavaVMOption *option = vm_args.options + i; 3778 if (match_option(option, "-XX:", &tail)) { 3779 logOption(tail); 3780 } 3781 } 3782 } 3783 3784 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3785 } 3786 return JNI_OK; 3787 } 3788 3789 void Arguments::set_shared_spaces_flags() { 3790 if (DumpSharedSpaces) { 3791 if (FailOverToOldVerifier) { 3792 // Don't fall back to the old verifier on verification failure. If a 3793 // class fails verification with the split verifier, it might fail the 3794 // CDS runtime verifier constraint check. In that case, we don't want 3795 // to share the class. We only archive classes that pass the split verifier. 3796 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3797 } 3798 3799 if (RequireSharedSpaces) { 3800 warning("cannot dump shared archive while using shared archive"); 3801 } 3802 UseSharedSpaces = false; 3803 #ifdef _LP64 3804 if (!UseCompressedOops || !UseCompressedClassPointers) { 3805 vm_exit_during_initialization( 3806 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3807 } 3808 } else { 3809 if (!UseCompressedOops || !UseCompressedClassPointers) { 3810 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3811 } 3812 #endif 3813 } 3814 } 3815 3816 #if !INCLUDE_ALL_GCS 3817 static void force_serial_gc() { 3818 FLAG_SET_DEFAULT(UseSerialGC, true); 3819 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3820 UNSUPPORTED_GC_OPTION(UseG1GC); 3821 UNSUPPORTED_GC_OPTION(UseParallelGC); 3822 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3823 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3824 UNSUPPORTED_GC_OPTION(UseParNewGC); 3825 } 3826 #endif // INCLUDE_ALL_GCS 3827 3828 // Sharing support 3829 // Construct the path to the archive 3830 static char* get_shared_archive_path() { 3831 char *shared_archive_path; 3832 if (SharedArchiveFile == NULL) { 3833 char jvm_path[JVM_MAXPATHLEN]; 3834 os::jvm_path(jvm_path, sizeof(jvm_path)); 3835 char *end = strrchr(jvm_path, *os::file_separator()); 3836 if (end != NULL) *end = '\0'; 3837 size_t jvm_path_len = strlen(jvm_path); 3838 size_t file_sep_len = strlen(os::file_separator()); 3839 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3840 file_sep_len + 20, mtInternal); 3841 if (shared_archive_path != NULL) { 3842 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3843 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3844 strncat(shared_archive_path, "classes.jsa", 11); 3845 } 3846 } else { 3847 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3848 if (shared_archive_path != NULL) { 3849 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3850 } 3851 } 3852 return shared_archive_path; 3853 } 3854 3855 #ifndef PRODUCT 3856 // Determine whether LogVMOutput should be implicitly turned on. 3857 static bool use_vm_log() { 3858 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3859 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3860 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3861 PrintAssembly || TraceDeoptimization || TraceDependencies || 3862 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3863 return true; 3864 } 3865 3866 #ifdef COMPILER1 3867 if (PrintC1Statistics) { 3868 return true; 3869 } 3870 #endif // COMPILER1 3871 3872 #ifdef COMPILER2 3873 if (PrintOptoAssembly || PrintOptoStatistics) { 3874 return true; 3875 } 3876 #endif // COMPILER2 3877 3878 return false; 3879 } 3880 #endif // PRODUCT 3881 3882 // Parse entry point called from JNI_CreateJavaVM 3883 3884 jint Arguments::parse(const JavaVMInitArgs* args) { 3885 3886 // Remaining part of option string 3887 const char* tail; 3888 3889 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3890 const char* hotspotrc = ".hotspotrc"; 3891 bool settings_file_specified = false; 3892 bool needs_hotspotrc_warning = false; 3893 3894 ArgumentsExt::process_options(args); 3895 3896 const char* flags_file; 3897 int index; 3898 for (index = 0; index < args->nOptions; index++) { 3899 const JavaVMOption *option = args->options + index; 3900 if (match_option(option, "-XX:Flags=", &tail)) { 3901 flags_file = tail; 3902 settings_file_specified = true; 3903 } 3904 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3905 PrintVMOptions = true; 3906 } 3907 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3908 PrintVMOptions = false; 3909 } 3910 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3911 IgnoreUnrecognizedVMOptions = true; 3912 } 3913 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3914 IgnoreUnrecognizedVMOptions = false; 3915 } 3916 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3917 CommandLineFlags::printFlags(tty, false); 3918 vm_exit(0); 3919 } 3920 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3921 #if INCLUDE_NMT 3922 // The launcher did not setup nmt environment variable properly. 3923 if (!MemTracker::check_launcher_nmt_support(tail)) { 3924 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3925 } 3926 3927 // Verify if nmt option is valid. 3928 if (MemTracker::verify_nmt_option()) { 3929 // Late initialization, still in single-threaded mode. 3930 if (MemTracker::tracking_level() >= NMT_summary) { 3931 MemTracker::init(); 3932 } 3933 } else { 3934 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3935 } 3936 #else 3937 jio_fprintf(defaultStream::error_stream(), 3938 "Native Memory Tracking is not supported in this VM\n"); 3939 return JNI_ERR; 3940 #endif 3941 } 3942 3943 3944 #ifndef PRODUCT 3945 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3946 CommandLineFlags::printFlags(tty, true); 3947 vm_exit(0); 3948 } 3949 #endif 3950 } 3951 3952 if (IgnoreUnrecognizedVMOptions) { 3953 // uncast const to modify the flag args->ignoreUnrecognized 3954 *(jboolean*)(&args->ignoreUnrecognized) = true; 3955 } 3956 3957 // Parse specified settings file 3958 if (settings_file_specified) { 3959 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3960 return JNI_EINVAL; 3961 } 3962 } else { 3963 #ifdef ASSERT 3964 // Parse default .hotspotrc settings file 3965 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3966 return JNI_EINVAL; 3967 } 3968 #else 3969 struct stat buf; 3970 if (os::stat(hotspotrc, &buf) == 0) { 3971 needs_hotspotrc_warning = true; 3972 } 3973 #endif 3974 } 3975 3976 if (PrintVMOptions) { 3977 for (index = 0; index < args->nOptions; index++) { 3978 const JavaVMOption *option = args->options + index; 3979 if (match_option(option, "-XX:", &tail)) { 3980 logOption(tail); 3981 } 3982 } 3983 } 3984 3985 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3986 jint result = parse_vm_init_args(args); 3987 if (result != JNI_OK) { 3988 return result; 3989 } 3990 3991 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3992 SharedArchivePath = get_shared_archive_path(); 3993 if (SharedArchivePath == NULL) { 3994 return JNI_ENOMEM; 3995 } 3996 3997 // Set up VerifySharedSpaces 3998 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3999 VerifySharedSpaces = true; 4000 } 4001 4002 // Delay warning until here so that we've had a chance to process 4003 // the -XX:-PrintWarnings flag 4004 if (needs_hotspotrc_warning) { 4005 warning("%s file is present but has been ignored. " 4006 "Run with -XX:Flags=%s to load the file.", 4007 hotspotrc, hotspotrc); 4008 } 4009 4010 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 4011 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 4012 #endif 4013 4014 #if INCLUDE_ALL_GCS 4015 #if (defined JAVASE_EMBEDDED || defined ARM) 4016 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 4017 #endif 4018 #endif 4019 4020 #ifndef PRODUCT 4021 if (TraceBytecodesAt != 0) { 4022 TraceBytecodes = true; 4023 } 4024 if (CountCompiledCalls) { 4025 if (UseCounterDecay) { 4026 warning("UseCounterDecay disabled because CountCalls is set"); 4027 UseCounterDecay = false; 4028 } 4029 } 4030 #endif // PRODUCT 4031 4032 // JSR 292 is not supported before 1.7 4033 if (!JDK_Version::is_gte_jdk17x_version()) { 4034 if (EnableInvokeDynamic) { 4035 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 4036 warning("JSR 292 is not supported before 1.7. Disabling support."); 4037 } 4038 EnableInvokeDynamic = false; 4039 } 4040 } 4041 4042 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 4043 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4044 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 4045 } 4046 ScavengeRootsInCode = 1; 4047 } 4048 4049 if (PrintGCDetails) { 4050 // Turn on -verbose:gc options as well 4051 PrintGC = true; 4052 } 4053 4054 if (!JDK_Version::is_gte_jdk18x_version()) { 4055 // To avoid changing the log format for 7 updates this flag is only 4056 // true by default in JDK8 and above. 4057 if (FLAG_IS_DEFAULT(PrintGCCause)) { 4058 FLAG_SET_DEFAULT(PrintGCCause, false); 4059 } 4060 } 4061 4062 // Set object alignment values. 4063 set_object_alignment(); 4064 4065 #if !INCLUDE_ALL_GCS 4066 force_serial_gc(); 4067 #endif // INCLUDE_ALL_GCS 4068 #if !INCLUDE_CDS 4069 if (DumpSharedSpaces || RequireSharedSpaces) { 4070 jio_fprintf(defaultStream::error_stream(), 4071 "Shared spaces are not supported in this VM\n"); 4072 return JNI_ERR; 4073 } 4074 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4075 warning("Shared spaces are not supported in this VM"); 4076 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4077 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4078 } 4079 no_shared_spaces("CDS Disabled"); 4080 #endif // INCLUDE_CDS 4081 4082 return JNI_OK; 4083 } 4084 4085 jint Arguments::apply_ergo() { 4086 4087 // Set flags based on ergonomics. 4088 set_ergonomics_flags(); 4089 4090 set_shared_spaces_flags(); 4091 4092 #if defined(SPARC) 4093 // BIS instructions require 'membar' instruction regardless of the number 4094 // of CPUs because in virtualized/container environments which might use only 1 4095 // CPU, BIS instructions may produce incorrect results. 4096 4097 if (FLAG_IS_DEFAULT(AssumeMP)) { 4098 FLAG_SET_DEFAULT(AssumeMP, true); 4099 } 4100 #endif 4101 4102 // Check the GC selections again. 4103 if (!check_gc_consistency()) { 4104 return JNI_EINVAL; 4105 } 4106 4107 if (TieredCompilation) { 4108 set_tiered_flags(); 4109 } else { 4110 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 4111 if (CompilationPolicyChoice >= 2) { 4112 vm_exit_during_initialization( 4113 "Incompatible compilation policy selected", NULL); 4114 } 4115 } 4116 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 4117 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 4118 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 4119 } 4120 4121 4122 // Set heap size based on available physical memory 4123 set_heap_size(); 4124 4125 ArgumentsExt::set_gc_specific_flags(); 4126 4127 // Initialize Metaspace flags and alignments. 4128 Metaspace::ergo_initialize(); 4129 4130 // Set bytecode rewriting flags 4131 set_bytecode_flags(); 4132 4133 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 4134 set_aggressive_opts_flags(); 4135 4136 // Turn off biased locking for locking debug mode flags, 4137 // which are subtlely different from each other but neither works with 4138 // biased locking. 4139 if (UseHeavyMonitors 4140 #ifdef COMPILER1 4141 || !UseFastLocking 4142 #endif // COMPILER1 4143 ) { 4144 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4145 // flag set to true on command line; warn the user that they 4146 // can't enable biased locking here 4147 warning("Biased Locking is not supported with locking debug flags" 4148 "; ignoring UseBiasedLocking flag." ); 4149 } 4150 UseBiasedLocking = false; 4151 } 4152 4153 #ifdef ZERO 4154 // Clear flags not supported on zero. 4155 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4156 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4157 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4158 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4159 #endif // CC_INTERP 4160 4161 #ifdef COMPILER2 4162 if (!EliminateLocks) { 4163 EliminateNestedLocks = false; 4164 } 4165 if (!Inline) { 4166 IncrementalInline = false; 4167 } 4168 #ifndef PRODUCT 4169 if (!IncrementalInline) { 4170 AlwaysIncrementalInline = false; 4171 } 4172 #endif 4173 if (IncrementalInline && FLAG_IS_DEFAULT(MaxNodeLimit)) { 4174 // incremental inlining: bump MaxNodeLimit 4175 FLAG_SET_DEFAULT(MaxNodeLimit, (intx)75000); 4176 } 4177 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4178 // nothing to use the profiling, turn if off 4179 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4180 } 4181 #endif 4182 4183 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4184 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4185 DebugNonSafepoints = true; 4186 } 4187 4188 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4189 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4190 } 4191 4192 if (UseOnStackReplacement && !UseLoopCounter) { 4193 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4194 FLAG_SET_DEFAULT(UseLoopCounter, true); 4195 } 4196 4197 #ifndef PRODUCT 4198 if (CompileTheWorld) { 4199 // Force NmethodSweeper to sweep whole CodeCache each time. 4200 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 4201 NmethodSweepFraction = 1; 4202 } 4203 } 4204 4205 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4206 if (use_vm_log()) { 4207 LogVMOutput = true; 4208 } 4209 } 4210 #endif // PRODUCT 4211 4212 if (PrintCommandLineFlags) { 4213 CommandLineFlags::printSetFlags(tty); 4214 } 4215 4216 // Apply CPU specific policy for the BiasedLocking 4217 if (UseBiasedLocking) { 4218 if (!VM_Version::use_biased_locking() && 4219 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4220 UseBiasedLocking = false; 4221 } 4222 } 4223 #ifdef COMPILER2 4224 if (!UseBiasedLocking || EmitSync != 0) { 4225 UseOptoBiasInlining = false; 4226 } 4227 #endif 4228 4229 // set PauseAtExit if the gamma launcher was used and a debugger is attached 4230 // but only if not already set on the commandline 4231 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 4232 bool set = false; 4233 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 4234 if (!set) { 4235 FLAG_SET_DEFAULT(PauseAtExit, true); 4236 } 4237 } 4238 4239 return JNI_OK; 4240 } 4241 4242 jint Arguments::adjust_after_os() { 4243 if (UseNUMA) { 4244 if (UseParallelGC || UseParallelOldGC) { 4245 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4246 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4247 } 4248 } 4249 // UseNUMAInterleaving is set to ON for all collectors and 4250 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4251 // such as the parallel collector for Linux and Solaris will 4252 // interleave old gen and survivor spaces on top of NUMA 4253 // allocation policy for the eden space. 4254 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4255 // all platforms and ParallelGC on Windows will interleave all 4256 // of the heap spaces across NUMA nodes. 4257 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4258 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4259 } 4260 } 4261 return JNI_OK; 4262 } 4263 4264 int Arguments::PropertyList_count(SystemProperty* pl) { 4265 int count = 0; 4266 while(pl != NULL) { 4267 count++; 4268 pl = pl->next(); 4269 } 4270 return count; 4271 } 4272 4273 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4274 assert(key != NULL, "just checking"); 4275 SystemProperty* prop; 4276 for (prop = pl; prop != NULL; prop = prop->next()) { 4277 if (strcmp(key, prop->key()) == 0) return prop->value(); 4278 } 4279 return NULL; 4280 } 4281 4282 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4283 int count = 0; 4284 const char* ret_val = NULL; 4285 4286 while(pl != NULL) { 4287 if(count >= index) { 4288 ret_val = pl->key(); 4289 break; 4290 } 4291 count++; 4292 pl = pl->next(); 4293 } 4294 4295 return ret_val; 4296 } 4297 4298 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4299 int count = 0; 4300 char* ret_val = NULL; 4301 4302 while(pl != NULL) { 4303 if(count >= index) { 4304 ret_val = pl->value(); 4305 break; 4306 } 4307 count++; 4308 pl = pl->next(); 4309 } 4310 4311 return ret_val; 4312 } 4313 4314 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4315 SystemProperty* p = *plist; 4316 if (p == NULL) { 4317 *plist = new_p; 4318 } else { 4319 while (p->next() != NULL) { 4320 p = p->next(); 4321 } 4322 p->set_next(new_p); 4323 } 4324 } 4325 4326 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4327 if (plist == NULL) 4328 return; 4329 4330 SystemProperty* new_p = new SystemProperty(k, v, true); 4331 PropertyList_add(plist, new_p); 4332 } 4333 4334 // This add maintains unique property key in the list. 4335 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4336 if (plist == NULL) 4337 return; 4338 4339 // If property key exist then update with new value. 4340 SystemProperty* prop; 4341 for (prop = *plist; prop != NULL; prop = prop->next()) { 4342 if (strcmp(k, prop->key()) == 0) { 4343 if (append) { 4344 prop->append_value(v); 4345 } else { 4346 prop->set_value(v); 4347 } 4348 return; 4349 } 4350 } 4351 4352 PropertyList_add(plist, k, v); 4353 } 4354 4355 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4356 // Returns true if all of the source pointed by src has been copied over to 4357 // the destination buffer pointed by buf. Otherwise, returns false. 4358 // Notes: 4359 // 1. If the length (buflen) of the destination buffer excluding the 4360 // NULL terminator character is not long enough for holding the expanded 4361 // pid characters, it also returns false instead of returning the partially 4362 // expanded one. 4363 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4364 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4365 char* buf, size_t buflen) { 4366 const char* p = src; 4367 char* b = buf; 4368 const char* src_end = &src[srclen]; 4369 char* buf_end = &buf[buflen - 1]; 4370 4371 while (p < src_end && b < buf_end) { 4372 if (*p == '%') { 4373 switch (*(++p)) { 4374 case '%': // "%%" ==> "%" 4375 *b++ = *p++; 4376 break; 4377 case 'p': { // "%p" ==> current process id 4378 // buf_end points to the character before the last character so 4379 // that we could write '\0' to the end of the buffer. 4380 size_t buf_sz = buf_end - b + 1; 4381 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4382 4383 // if jio_snprintf fails or the buffer is not long enough to hold 4384 // the expanded pid, returns false. 4385 if (ret < 0 || ret >= (int)buf_sz) { 4386 return false; 4387 } else { 4388 b += ret; 4389 assert(*b == '\0', "fail in copy_expand_pid"); 4390 if (p == src_end && b == buf_end + 1) { 4391 // reach the end of the buffer. 4392 return true; 4393 } 4394 } 4395 p++; 4396 break; 4397 } 4398 default : 4399 *b++ = '%'; 4400 } 4401 } else { 4402 *b++ = *p++; 4403 } 4404 } 4405 *b = '\0'; 4406 return (p == src_end); // return false if not all of the source was copied 4407 }