1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "compiler/compilerOracle.hpp" 31 #include "memory/allocation.inline.hpp" 32 #include "memory/cardTableRS.hpp" 33 #include "memory/genCollectedHeap.hpp" 34 #include "memory/referenceProcessor.hpp" 35 #include "memory/universe.inline.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "prims/jvmtiExport.hpp" 38 #include "runtime/arguments.hpp" 39 #include "runtime/arguments_ext.hpp" 40 #include "runtime/globals_extension.hpp" 41 #include "runtime/java.hpp" 42 #include "runtime/os.hpp" 43 #include "runtime/vm_version.hpp" 44 #include "services/management.hpp" 45 #include "services/memTracker.hpp" 46 #include "utilities/defaultStream.hpp" 47 #include "utilities/macros.hpp" 48 #include "utilities/stringUtils.hpp" 49 #include "utilities/taskqueue.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 54 #endif // INCLUDE_ALL_GCS 55 56 // Note: This is a special bug reporting site for the JVM 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 58 #define DEFAULT_JAVA_LAUNCHER "generic" 59 60 // Disable options not supported in this release, with a warning if they 61 // were explicitly requested on the command-line 62 #define UNSUPPORTED_OPTION(opt, description) \ 63 do { \ 64 if (opt) { \ 65 if (FLAG_IS_CMDLINE(opt)) { \ 66 warning(description " is disabled in this release."); \ 67 } \ 68 FLAG_SET_DEFAULT(opt, false); \ 69 } \ 70 } while(0) 71 72 #define UNSUPPORTED_GC_OPTION(gc) \ 73 do { \ 74 if (gc) { \ 75 if (FLAG_IS_CMDLINE(gc)) { \ 76 warning(#gc " is not supported in this VM. Using Serial GC."); \ 77 } \ 78 FLAG_SET_DEFAULT(gc, false); \ 79 } \ 80 } while(0) 81 82 char** Arguments::_jvm_flags_array = NULL; 83 int Arguments::_num_jvm_flags = 0; 84 char** Arguments::_jvm_args_array = NULL; 85 int Arguments::_num_jvm_args = 0; 86 char* Arguments::_java_command = NULL; 87 SystemProperty* Arguments::_system_properties = NULL; 88 const char* Arguments::_gc_log_filename = NULL; 89 bool Arguments::_has_profile = false; 90 size_t Arguments::_conservative_max_heap_alignment = 0; 91 uintx Arguments::_min_heap_size = 0; 92 uintx Arguments::_min_heap_free_ratio = 0; 93 uintx Arguments::_max_heap_free_ratio = 0; 94 Arguments::Mode Arguments::_mode = _mixed; 95 bool Arguments::_java_compiler = false; 96 bool Arguments::_xdebug_mode = false; 97 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 99 int Arguments::_sun_java_launcher_pid = -1; 100 bool Arguments::_sun_java_launcher_is_altjvm = false; 101 102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 105 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 106 bool Arguments::_ClipInlining = ClipInlining; 107 108 char* Arguments::SharedArchivePath = NULL; 109 110 AgentLibraryList Arguments::_libraryList; 111 AgentLibraryList Arguments::_agentList; 112 113 abort_hook_t Arguments::_abort_hook = NULL; 114 exit_hook_t Arguments::_exit_hook = NULL; 115 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 116 117 118 SystemProperty *Arguments::_java_ext_dirs = NULL; 119 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 120 SystemProperty *Arguments::_sun_boot_library_path = NULL; 121 SystemProperty *Arguments::_java_library_path = NULL; 122 SystemProperty *Arguments::_java_home = NULL; 123 SystemProperty *Arguments::_java_class_path = NULL; 124 SystemProperty *Arguments::_sun_boot_class_path = NULL; 125 126 char* Arguments::_meta_index_path = NULL; 127 char* Arguments::_meta_index_dir = NULL; 128 129 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 130 131 static bool match_option(const JavaVMOption *option, const char* name, 132 const char** tail) { 133 int len = (int)strlen(name); 134 if (strncmp(option->optionString, name, len) == 0) { 135 *tail = option->optionString + len; 136 return true; 137 } else { 138 return false; 139 } 140 } 141 142 static void logOption(const char* opt) { 143 if (PrintVMOptions) { 144 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 145 } 146 } 147 148 // Process java launcher properties. 149 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 150 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 151 // sun.java.launcher.pid is defined. 152 // Must do this before setting up other system properties, 153 // as some of them may depend on launcher type. 154 for (int index = 0; index < args->nOptions; index++) { 155 const JavaVMOption* option = args->options + index; 156 const char* tail; 157 158 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 159 process_java_launcher_argument(tail, option->extraInfo); 160 continue; 161 } 162 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 163 if (strcmp(tail, "true") == 0) { 164 _sun_java_launcher_is_altjvm = true; 165 } 166 continue; 167 } 168 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 169 _sun_java_launcher_pid = atoi(tail); 170 continue; 171 } 172 } 173 } 174 175 // Initialize system properties key and value. 176 void Arguments::init_system_properties() { 177 178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 179 "Java Virtual Machine Specification", false)); 180 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 181 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 182 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 183 184 // Following are JVMTI agent writable properties. 185 // Properties values are set to NULL and they are 186 // os specific they are initialized in os::init_system_properties_values(). 187 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 188 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 189 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 190 _java_library_path = new SystemProperty("java.library.path", NULL, true); 191 _java_home = new SystemProperty("java.home", NULL, true); 192 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 193 194 _java_class_path = new SystemProperty("java.class.path", "", true); 195 196 // Add to System Property list. 197 PropertyList_add(&_system_properties, _java_ext_dirs); 198 PropertyList_add(&_system_properties, _java_endorsed_dirs); 199 PropertyList_add(&_system_properties, _sun_boot_library_path); 200 PropertyList_add(&_system_properties, _java_library_path); 201 PropertyList_add(&_system_properties, _java_home); 202 PropertyList_add(&_system_properties, _java_class_path); 203 PropertyList_add(&_system_properties, _sun_boot_class_path); 204 205 // Set OS specific system properties values 206 os::init_system_properties_values(); 207 } 208 209 210 // Update/Initialize System properties after JDK version number is known 211 void Arguments::init_version_specific_system_properties() { 212 enum { bufsz = 16 }; 213 char buffer[bufsz]; 214 const char* spec_vendor = "Sun Microsystems Inc."; 215 uint32_t spec_version = 0; 216 217 spec_vendor = "Oracle Corporation"; 218 spec_version = JDK_Version::current().major_version(); 219 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 220 221 PropertyList_add(&_system_properties, 222 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 223 PropertyList_add(&_system_properties, 224 new SystemProperty("java.vm.specification.version", buffer, false)); 225 PropertyList_add(&_system_properties, 226 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 227 } 228 229 /** 230 * Provide a slightly more user-friendly way of eliminating -XX flags. 231 * When a flag is eliminated, it can be added to this list in order to 232 * continue accepting this flag on the command-line, while issuing a warning 233 * and ignoring the value. Once the JDK version reaches the 'accept_until' 234 * limit, we flatly refuse to admit the existence of the flag. This allows 235 * a flag to die correctly over JDK releases using HSX. 236 */ 237 typedef struct { 238 const char* name; 239 JDK_Version obsoleted_in; // when the flag went away 240 JDK_Version accept_until; // which version to start denying the existence 241 } ObsoleteFlag; 242 243 static ObsoleteFlag obsolete_jvm_flags[] = { 244 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 245 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 246 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 255 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 256 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 257 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 258 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 259 { "DefaultInitialRAMFraction", 260 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 261 { "UseDepthFirstScavengeOrder", 262 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 263 { "HandlePromotionFailure", 264 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 265 { "MaxLiveObjectEvacuationRatio", 266 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 267 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 268 { "UseParallelOldGCCompacting", 269 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 270 { "UseParallelDensePrefixUpdate", 271 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 272 { "UseParallelOldGCDensePrefix", 273 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 274 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 275 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 276 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 277 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 278 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 292 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 293 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 294 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 295 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 296 #ifdef PRODUCT 297 { "DesiredMethodLimit", 298 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 299 #endif // PRODUCT 300 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 302 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 303 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 304 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 305 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 306 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 307 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 308 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 309 #ifndef ZERO 310 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 311 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 312 #endif // ZERO 313 { NULL, JDK_Version(0), JDK_Version(0) } 314 }; 315 316 // Returns true if the flag is obsolete and fits into the range specified 317 // for being ignored. In the case that the flag is ignored, the 'version' 318 // value is filled in with the version number when the flag became 319 // obsolete so that that value can be displayed to the user. 320 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 321 int i = 0; 322 assert(version != NULL, "Must provide a version buffer"); 323 while (obsolete_jvm_flags[i].name != NULL) { 324 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 325 // <flag>=xxx form 326 // [-|+]<flag> form 327 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 328 ((s[0] == '+' || s[0] == '-') && 329 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 330 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 331 *version = flag_status.obsoleted_in; 332 return true; 333 } 334 } 335 i++; 336 } 337 return false; 338 } 339 340 // Constructs the system class path (aka boot class path) from the following 341 // components, in order: 342 // 343 // prefix // from -Xbootclasspath/p:... 344 // endorsed // the expansion of -Djava.endorsed.dirs=... 345 // base // from os::get_system_properties() or -Xbootclasspath= 346 // suffix // from -Xbootclasspath/a:... 347 // 348 // java.endorsed.dirs is a list of directories; any jar or zip files in the 349 // directories are added to the sysclasspath just before the base. 350 // 351 // This could be AllStatic, but it isn't needed after argument processing is 352 // complete. 353 class SysClassPath: public StackObj { 354 public: 355 SysClassPath(const char* base); 356 ~SysClassPath(); 357 358 inline void set_base(const char* base); 359 inline void add_prefix(const char* prefix); 360 inline void add_suffix_to_prefix(const char* suffix); 361 inline void add_suffix(const char* suffix); 362 inline void reset_path(const char* base); 363 364 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 365 // property. Must be called after all command-line arguments have been 366 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 367 // combined_path(). 368 void expand_endorsed(); 369 370 inline const char* get_base() const { return _items[_scp_base]; } 371 inline const char* get_prefix() const { return _items[_scp_prefix]; } 372 inline const char* get_suffix() const { return _items[_scp_suffix]; } 373 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 374 375 // Combine all the components into a single c-heap-allocated string; caller 376 // must free the string if/when no longer needed. 377 char* combined_path(); 378 379 private: 380 // Utility routines. 381 static char* add_to_path(const char* path, const char* str, bool prepend); 382 static char* add_jars_to_path(char* path, const char* directory); 383 384 inline void reset_item_at(int index); 385 386 // Array indices for the items that make up the sysclasspath. All except the 387 // base are allocated in the C heap and freed by this class. 388 enum { 389 _scp_prefix, // from -Xbootclasspath/p:... 390 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 391 _scp_base, // the default sysclasspath 392 _scp_suffix, // from -Xbootclasspath/a:... 393 _scp_nitems // the number of items, must be last. 394 }; 395 396 const char* _items[_scp_nitems]; 397 DEBUG_ONLY(bool _expansion_done;) 398 }; 399 400 SysClassPath::SysClassPath(const char* base) { 401 memset(_items, 0, sizeof(_items)); 402 _items[_scp_base] = base; 403 DEBUG_ONLY(_expansion_done = false;) 404 } 405 406 SysClassPath::~SysClassPath() { 407 // Free everything except the base. 408 for (int i = 0; i < _scp_nitems; ++i) { 409 if (i != _scp_base) reset_item_at(i); 410 } 411 DEBUG_ONLY(_expansion_done = false;) 412 } 413 414 inline void SysClassPath::set_base(const char* base) { 415 _items[_scp_base] = base; 416 } 417 418 inline void SysClassPath::add_prefix(const char* prefix) { 419 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 420 } 421 422 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 423 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 424 } 425 426 inline void SysClassPath::add_suffix(const char* suffix) { 427 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 428 } 429 430 inline void SysClassPath::reset_item_at(int index) { 431 assert(index < _scp_nitems && index != _scp_base, "just checking"); 432 if (_items[index] != NULL) { 433 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 434 _items[index] = NULL; 435 } 436 } 437 438 inline void SysClassPath::reset_path(const char* base) { 439 // Clear the prefix and suffix. 440 reset_item_at(_scp_prefix); 441 reset_item_at(_scp_suffix); 442 set_base(base); 443 } 444 445 //------------------------------------------------------------------------------ 446 447 void SysClassPath::expand_endorsed() { 448 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 449 450 const char* path = Arguments::get_property("java.endorsed.dirs"); 451 if (path == NULL) { 452 path = Arguments::get_endorsed_dir(); 453 assert(path != NULL, "no default for java.endorsed.dirs"); 454 } 455 456 char* expanded_path = NULL; 457 const char separator = *os::path_separator(); 458 const char* const end = path + strlen(path); 459 while (path < end) { 460 const char* tmp_end = strchr(path, separator); 461 if (tmp_end == NULL) { 462 expanded_path = add_jars_to_path(expanded_path, path); 463 path = end; 464 } else { 465 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 466 memcpy(dirpath, path, tmp_end - path); 467 dirpath[tmp_end - path] = '\0'; 468 expanded_path = add_jars_to_path(expanded_path, dirpath); 469 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 470 path = tmp_end + 1; 471 } 472 } 473 _items[_scp_endorsed] = expanded_path; 474 DEBUG_ONLY(_expansion_done = true;) 475 } 476 477 // Combine the bootclasspath elements, some of which may be null, into a single 478 // c-heap-allocated string. 479 char* SysClassPath::combined_path() { 480 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 481 assert(_expansion_done, "must call expand_endorsed() first."); 482 483 size_t lengths[_scp_nitems]; 484 size_t total_len = 0; 485 486 const char separator = *os::path_separator(); 487 488 // Get the lengths. 489 int i; 490 for (i = 0; i < _scp_nitems; ++i) { 491 if (_items[i] != NULL) { 492 lengths[i] = strlen(_items[i]); 493 // Include space for the separator char (or a NULL for the last item). 494 total_len += lengths[i] + 1; 495 } 496 } 497 assert(total_len > 0, "empty sysclasspath not allowed"); 498 499 // Copy the _items to a single string. 500 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 501 char* cp_tmp = cp; 502 for (i = 0; i < _scp_nitems; ++i) { 503 if (_items[i] != NULL) { 504 memcpy(cp_tmp, _items[i], lengths[i]); 505 cp_tmp += lengths[i]; 506 *cp_tmp++ = separator; 507 } 508 } 509 *--cp_tmp = '\0'; // Replace the extra separator. 510 return cp; 511 } 512 513 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 514 char* 515 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 516 char *cp; 517 518 assert(str != NULL, "just checking"); 519 if (path == NULL) { 520 size_t len = strlen(str) + 1; 521 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 522 memcpy(cp, str, len); // copy the trailing null 523 } else { 524 const char separator = *os::path_separator(); 525 size_t old_len = strlen(path); 526 size_t str_len = strlen(str); 527 size_t len = old_len + str_len + 2; 528 529 if (prepend) { 530 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 531 char* cp_tmp = cp; 532 memcpy(cp_tmp, str, str_len); 533 cp_tmp += str_len; 534 *cp_tmp = separator; 535 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 536 FREE_C_HEAP_ARRAY(char, path, mtInternal); 537 } else { 538 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 539 char* cp_tmp = cp + old_len; 540 *cp_tmp = separator; 541 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 542 } 543 } 544 return cp; 545 } 546 547 // Scan the directory and append any jar or zip files found to path. 548 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 549 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 550 DIR* dir = os::opendir(directory); 551 if (dir == NULL) return path; 552 553 char dir_sep[2] = { '\0', '\0' }; 554 size_t directory_len = strlen(directory); 555 const char fileSep = *os::file_separator(); 556 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 557 558 /* Scan the directory for jars/zips, appending them to path. */ 559 struct dirent *entry; 560 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 561 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 562 const char* name = entry->d_name; 563 const char* ext = name + strlen(name) - 4; 564 bool isJarOrZip = ext > name && 565 (os::file_name_strcmp(ext, ".jar") == 0 || 566 os::file_name_strcmp(ext, ".zip") == 0); 567 if (isJarOrZip) { 568 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 569 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 570 path = add_to_path(path, jarpath, false); 571 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 572 } 573 } 574 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 575 os::closedir(dir); 576 return path; 577 } 578 579 // Parses a memory size specification string. 580 static bool atomull(const char *s, julong* result) { 581 julong n = 0; 582 int args_read = 0; 583 bool is_hex = false; 584 // Skip leading 0[xX] for hexadecimal 585 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 586 s += 2; 587 is_hex = true; 588 args_read = sscanf(s, JULONG_FORMAT_X, &n); 589 } else { 590 args_read = sscanf(s, JULONG_FORMAT, &n); 591 } 592 if (args_read != 1) { 593 return false; 594 } 595 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 596 s++; 597 } 598 // 4705540: illegal if more characters are found after the first non-digit 599 if (strlen(s) > 1) { 600 return false; 601 } 602 switch (*s) { 603 case 'T': case 't': 604 *result = n * G * K; 605 // Check for overflow. 606 if (*result/((julong)G * K) != n) return false; 607 return true; 608 case 'G': case 'g': 609 *result = n * G; 610 if (*result/G != n) return false; 611 return true; 612 case 'M': case 'm': 613 *result = n * M; 614 if (*result/M != n) return false; 615 return true; 616 case 'K': case 'k': 617 *result = n * K; 618 if (*result/K != n) return false; 619 return true; 620 case '\0': 621 *result = n; 622 return true; 623 default: 624 return false; 625 } 626 } 627 628 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 629 if (size < min_size) return arg_too_small; 630 // Check that size will fit in a size_t (only relevant on 32-bit) 631 if (size > max_uintx) return arg_too_big; 632 return arg_in_range; 633 } 634 635 // Describe an argument out of range error 636 void Arguments::describe_range_error(ArgsRange errcode) { 637 switch(errcode) { 638 case arg_too_big: 639 jio_fprintf(defaultStream::error_stream(), 640 "The specified size exceeds the maximum " 641 "representable size.\n"); 642 break; 643 case arg_too_small: 644 case arg_unreadable: 645 case arg_in_range: 646 // do nothing for now 647 break; 648 default: 649 ShouldNotReachHere(); 650 } 651 } 652 653 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 654 return CommandLineFlags::boolAtPut(name, &value, origin); 655 } 656 657 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 658 double v; 659 if (sscanf(value, "%lf", &v) != 1) { 660 return false; 661 } 662 663 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 664 return true; 665 } 666 return false; 667 } 668 669 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 670 julong v; 671 intx intx_v; 672 bool is_neg = false; 673 // Check the sign first since atomull() parses only unsigned values. 674 if (*value == '-') { 675 if (!CommandLineFlags::intxAt(name, &intx_v)) { 676 return false; 677 } 678 value++; 679 is_neg = true; 680 } 681 if (!atomull(value, &v)) { 682 return false; 683 } 684 intx_v = (intx) v; 685 if (is_neg) { 686 intx_v = -intx_v; 687 } 688 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 689 return true; 690 } 691 uintx uintx_v = (uintx) v; 692 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 693 return true; 694 } 695 uint64_t uint64_t_v = (uint64_t) v; 696 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 697 return true; 698 } 699 size_t size_t_v = (size_t) v; 700 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 701 return true; 702 } 703 return false; 704 } 705 706 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 707 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 708 // Contract: CommandLineFlags always returns a pointer that needs freeing. 709 FREE_C_HEAP_ARRAY(char, value, mtInternal); 710 return true; 711 } 712 713 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 714 const char* old_value = ""; 715 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 716 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 717 size_t new_len = strlen(new_value); 718 const char* value; 719 char* free_this_too = NULL; 720 if (old_len == 0) { 721 value = new_value; 722 } else if (new_len == 0) { 723 value = old_value; 724 } else { 725 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 726 // each new setting adds another LINE to the switch: 727 sprintf(buf, "%s\n%s", old_value, new_value); 728 value = buf; 729 free_this_too = buf; 730 } 731 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 732 // CommandLineFlags always returns a pointer that needs freeing. 733 FREE_C_HEAP_ARRAY(char, value, mtInternal); 734 if (free_this_too != NULL) { 735 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 736 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 737 } 738 return true; 739 } 740 741 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 742 743 // range of acceptable characters spelled out for portability reasons 744 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 745 #define BUFLEN 255 746 char name[BUFLEN+1]; 747 char dummy; 748 749 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 750 return set_bool_flag(name, false, origin); 751 } 752 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 753 return set_bool_flag(name, true, origin); 754 } 755 756 char punct; 757 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 758 const char* value = strchr(arg, '=') + 1; 759 Flag* flag = Flag::find_flag(name, strlen(name)); 760 if (flag != NULL && flag->is_ccstr()) { 761 if (flag->ccstr_accumulates()) { 762 return append_to_string_flag(name, value, origin); 763 } else { 764 if (value[0] == '\0') { 765 value = NULL; 766 } 767 return set_string_flag(name, value, origin); 768 } 769 } 770 } 771 772 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 773 const char* value = strchr(arg, '=') + 1; 774 // -XX:Foo:=xxx will reset the string flag to the given value. 775 if (value[0] == '\0') { 776 value = NULL; 777 } 778 return set_string_flag(name, value, origin); 779 } 780 781 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 782 #define SIGNED_NUMBER_RANGE "[-0123456789]" 783 #define NUMBER_RANGE "[0123456789]" 784 char value[BUFLEN + 1]; 785 char value2[BUFLEN + 1]; 786 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 787 // Looks like a floating-point number -- try again with more lenient format string 788 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 789 return set_fp_numeric_flag(name, value, origin); 790 } 791 } 792 793 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 794 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 795 return set_numeric_flag(name, value, origin); 796 } 797 798 return false; 799 } 800 801 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 802 assert(bldarray != NULL, "illegal argument"); 803 804 if (arg == NULL) { 805 return; 806 } 807 808 int new_count = *count + 1; 809 810 // expand the array and add arg to the last element 811 if (*bldarray == NULL) { 812 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 813 } else { 814 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 815 } 816 (*bldarray)[*count] = os::strdup_check_oom(arg); 817 *count = new_count; 818 } 819 820 void Arguments::build_jvm_args(const char* arg) { 821 add_string(&_jvm_args_array, &_num_jvm_args, arg); 822 } 823 824 void Arguments::build_jvm_flags(const char* arg) { 825 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 826 } 827 828 // utility function to return a string that concatenates all 829 // strings in a given char** array 830 const char* Arguments::build_resource_string(char** args, int count) { 831 if (args == NULL || count == 0) { 832 return NULL; 833 } 834 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 835 for (int i = 1; i < count; i++) { 836 length += strlen(args[i]) + 1; // add 1 for a space 837 } 838 char* s = NEW_RESOURCE_ARRAY(char, length); 839 strcpy(s, args[0]); 840 for (int j = 1; j < count; j++) { 841 strcat(s, " "); 842 strcat(s, args[j]); 843 } 844 return (const char*) s; 845 } 846 847 void Arguments::print_on(outputStream* st) { 848 st->print_cr("VM Arguments:"); 849 if (num_jvm_flags() > 0) { 850 st->print("jvm_flags: "); print_jvm_flags_on(st); 851 } 852 if (num_jvm_args() > 0) { 853 st->print("jvm_args: "); print_jvm_args_on(st); 854 } 855 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 856 if (_java_class_path != NULL) { 857 char* path = _java_class_path->value(); 858 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 859 } 860 st->print_cr("Launcher Type: %s", _sun_java_launcher); 861 } 862 863 void Arguments::print_jvm_flags_on(outputStream* st) { 864 if (_num_jvm_flags > 0) { 865 for (int i=0; i < _num_jvm_flags; i++) { 866 st->print("%s ", _jvm_flags_array[i]); 867 } 868 st->cr(); 869 } 870 } 871 872 void Arguments::print_jvm_args_on(outputStream* st) { 873 if (_num_jvm_args > 0) { 874 for (int i=0; i < _num_jvm_args; i++) { 875 st->print("%s ", _jvm_args_array[i]); 876 } 877 st->cr(); 878 } 879 } 880 881 bool Arguments::process_argument(const char* arg, 882 jboolean ignore_unrecognized, Flag::Flags origin) { 883 884 JDK_Version since = JDK_Version(); 885 886 if (parse_argument(arg, origin) || ignore_unrecognized) { 887 return true; 888 } 889 890 bool has_plus_minus = (*arg == '+' || *arg == '-'); 891 const char* const argname = has_plus_minus ? arg + 1 : arg; 892 if (is_newly_obsolete(arg, &since)) { 893 char version[256]; 894 since.to_string(version, sizeof(version)); 895 warning("ignoring option %s; support was removed in %s", argname, version); 896 return true; 897 } 898 899 // For locked flags, report a custom error message if available. 900 // Otherwise, report the standard unrecognized VM option. 901 902 size_t arg_len; 903 const char* equal_sign = strchr(argname, '='); 904 if (equal_sign == NULL) { 905 arg_len = strlen(argname); 906 } else { 907 arg_len = equal_sign - argname; 908 } 909 910 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 911 if (found_flag != NULL) { 912 char locked_message_buf[BUFLEN]; 913 found_flag->get_locked_message(locked_message_buf, BUFLEN); 914 if (strlen(locked_message_buf) == 0) { 915 if (found_flag->is_bool() && !has_plus_minus) { 916 jio_fprintf(defaultStream::error_stream(), 917 "Missing +/- setting for VM option '%s'\n", argname); 918 } else if (!found_flag->is_bool() && has_plus_minus) { 919 jio_fprintf(defaultStream::error_stream(), 920 "Unexpected +/- setting in VM option '%s'\n", argname); 921 } else { 922 jio_fprintf(defaultStream::error_stream(), 923 "Improperly specified VM option '%s'\n", argname); 924 } 925 } else { 926 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 927 } 928 } else { 929 jio_fprintf(defaultStream::error_stream(), 930 "Unrecognized VM option '%s'\n", argname); 931 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 932 if (fuzzy_matched != NULL) { 933 jio_fprintf(defaultStream::error_stream(), 934 "Did you mean '%s%s%s'?\n", 935 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 936 fuzzy_matched->_name, 937 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 938 } 939 } 940 941 // allow for commandline "commenting out" options like -XX:#+Verbose 942 return arg[0] == '#'; 943 } 944 945 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 946 FILE* stream = fopen(file_name, "rb"); 947 if (stream == NULL) { 948 if (should_exist) { 949 jio_fprintf(defaultStream::error_stream(), 950 "Could not open settings file %s\n", file_name); 951 return false; 952 } else { 953 return true; 954 } 955 } 956 957 char token[1024]; 958 int pos = 0; 959 960 bool in_white_space = true; 961 bool in_comment = false; 962 bool in_quote = false; 963 char quote_c = 0; 964 bool result = true; 965 966 int c = getc(stream); 967 while(c != EOF && pos < (int)(sizeof(token)-1)) { 968 if (in_white_space) { 969 if (in_comment) { 970 if (c == '\n') in_comment = false; 971 } else { 972 if (c == '#') in_comment = true; 973 else if (!isspace(c)) { 974 in_white_space = false; 975 token[pos++] = c; 976 } 977 } 978 } else { 979 if (c == '\n' || (!in_quote && isspace(c))) { 980 // token ends at newline, or at unquoted whitespace 981 // this allows a way to include spaces in string-valued options 982 token[pos] = '\0'; 983 logOption(token); 984 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 985 build_jvm_flags(token); 986 pos = 0; 987 in_white_space = true; 988 in_quote = false; 989 } else if (!in_quote && (c == '\'' || c == '"')) { 990 in_quote = true; 991 quote_c = c; 992 } else if (in_quote && (c == quote_c)) { 993 in_quote = false; 994 } else { 995 token[pos++] = c; 996 } 997 } 998 c = getc(stream); 999 } 1000 if (pos > 0) { 1001 token[pos] = '\0'; 1002 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1003 build_jvm_flags(token); 1004 } 1005 fclose(stream); 1006 return result; 1007 } 1008 1009 //============================================================================================================= 1010 // Parsing of properties (-D) 1011 1012 const char* Arguments::get_property(const char* key) { 1013 return PropertyList_get_value(system_properties(), key); 1014 } 1015 1016 bool Arguments::add_property(const char* prop) { 1017 const char* eq = strchr(prop, '='); 1018 char* key; 1019 // ns must be static--its address may be stored in a SystemProperty object. 1020 const static char ns[1] = {0}; 1021 char* value = (char *)ns; 1022 1023 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1024 key = AllocateHeap(key_len + 1, mtInternal); 1025 strncpy(key, prop, key_len); 1026 key[key_len] = '\0'; 1027 1028 if (eq != NULL) { 1029 size_t value_len = strlen(prop) - key_len - 1; 1030 value = AllocateHeap(value_len + 1, mtInternal); 1031 strncpy(value, &prop[key_len + 1], value_len + 1); 1032 } 1033 1034 if (strcmp(key, "java.compiler") == 0) { 1035 process_java_compiler_argument(value); 1036 FreeHeap(key); 1037 if (eq != NULL) { 1038 FreeHeap(value); 1039 } 1040 return true; 1041 } else if (strcmp(key, "sun.java.command") == 0) { 1042 _java_command = value; 1043 1044 // Record value in Arguments, but let it get passed to Java. 1045 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1046 strcmp(key, "sun.java.launcher.pid") == 0) { 1047 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1048 // private and are processed in process_sun_java_launcher_properties(); 1049 // the sun.java.launcher property is passed on to the java application 1050 FreeHeap(key); 1051 if (eq != NULL) { 1052 FreeHeap(value); 1053 } 1054 return true; 1055 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1056 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1057 // its value without going through the property list or making a Java call. 1058 _java_vendor_url_bug = value; 1059 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1060 PropertyList_unique_add(&_system_properties, key, value, true); 1061 return true; 1062 } 1063 // Create new property and add at the end of the list 1064 PropertyList_unique_add(&_system_properties, key, value); 1065 return true; 1066 } 1067 1068 //=========================================================================================================== 1069 // Setting int/mixed/comp mode flags 1070 1071 void Arguments::set_mode_flags(Mode mode) { 1072 // Set up default values for all flags. 1073 // If you add a flag to any of the branches below, 1074 // add a default value for it here. 1075 set_java_compiler(false); 1076 _mode = mode; 1077 1078 // Ensure Agent_OnLoad has the correct initial values. 1079 // This may not be the final mode; mode may change later in onload phase. 1080 PropertyList_unique_add(&_system_properties, "java.vm.info", 1081 (char*)VM_Version::vm_info_string(), false); 1082 1083 UseInterpreter = true; 1084 UseCompiler = true; 1085 UseLoopCounter = true; 1086 1087 // Default values may be platform/compiler dependent - 1088 // use the saved values 1089 ClipInlining = Arguments::_ClipInlining; 1090 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1091 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1092 BackgroundCompilation = Arguments::_BackgroundCompilation; 1093 1094 // Change from defaults based on mode 1095 switch (mode) { 1096 default: 1097 ShouldNotReachHere(); 1098 break; 1099 case _int: 1100 UseCompiler = false; 1101 UseLoopCounter = false; 1102 AlwaysCompileLoopMethods = false; 1103 UseOnStackReplacement = false; 1104 break; 1105 case _mixed: 1106 // same as default 1107 break; 1108 case _comp: 1109 UseInterpreter = false; 1110 BackgroundCompilation = false; 1111 ClipInlining = false; 1112 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1113 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1114 // compile a level 4 (C2) and then continue executing it. 1115 if (TieredCompilation) { 1116 Tier3InvokeNotifyFreqLog = 0; 1117 Tier4InvocationThreshold = 0; 1118 } 1119 break; 1120 } 1121 } 1122 1123 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1124 // Conflict: required to use shared spaces (-Xshare:on), but 1125 // incompatible command line options were chosen. 1126 1127 static void no_shared_spaces(const char* message) { 1128 if (RequireSharedSpaces) { 1129 jio_fprintf(defaultStream::error_stream(), 1130 "Class data sharing is inconsistent with other specified options.\n"); 1131 vm_exit_during_initialization("Unable to use shared archive.", message); 1132 } else { 1133 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1134 } 1135 } 1136 #endif 1137 1138 void Arguments::set_tiered_flags() { 1139 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1140 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1141 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1142 } 1143 if (CompilationPolicyChoice < 2) { 1144 vm_exit_during_initialization( 1145 "Incompatible compilation policy selected", NULL); 1146 } 1147 // Increase the code cache size - tiered compiles a lot more. 1148 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1149 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1150 } 1151 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1152 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1153 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1154 1155 // Multiply sizes by 5 but fix NonMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1156 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1157 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonMethodCodeHeapSize * 2); 1158 } 1159 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1160 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonMethodCodeHeapSize * 2); 1161 } 1162 // Check consistency of code heap sizes 1163 if ((NonMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1164 jio_fprintf(defaultStream::error_stream(), 1165 "Invalid code heap sizes: NonMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1166 NonMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1167 (NonMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1168 vm_exit(1); 1169 } 1170 } 1171 if (!UseInterpreter) { // -Xcomp 1172 Tier3InvokeNotifyFreqLog = 0; 1173 Tier4InvocationThreshold = 0; 1174 } 1175 } 1176 1177 /** 1178 * Returns the minimum number of compiler threads needed to run the JVM. The following 1179 * configurations are possible. 1180 * 1181 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1182 * compiler threads is 0. 1183 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1184 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1185 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1186 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1187 * C1 can be used, so the minimum number of compiler threads is 1. 1188 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1189 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1190 * the minimum number of compiler threads is 2. 1191 */ 1192 int Arguments::get_min_number_of_compiler_threads() { 1193 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1194 return 0; // case 1 1195 #else 1196 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1197 return 1; // case 2 or case 3 1198 } 1199 return 2; // case 4 (tiered) 1200 #endif 1201 } 1202 1203 #if INCLUDE_ALL_GCS 1204 static void disable_adaptive_size_policy(const char* collector_name) { 1205 if (UseAdaptiveSizePolicy) { 1206 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1207 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1208 collector_name); 1209 } 1210 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1211 } 1212 } 1213 1214 void Arguments::set_parnew_gc_flags() { 1215 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1216 "control point invariant"); 1217 assert(UseParNewGC, "Error"); 1218 1219 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1220 disable_adaptive_size_policy("UseParNewGC"); 1221 1222 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1223 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1224 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1225 } else if (ParallelGCThreads == 0) { 1226 jio_fprintf(defaultStream::error_stream(), 1227 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1228 vm_exit(1); 1229 } 1230 1231 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1232 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1233 // we set them to 1024 and 1024. 1234 // See CR 6362902. 1235 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1236 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1237 } 1238 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1239 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1240 } 1241 1242 // When using compressed oops, we use local overflow stacks, 1243 // rather than using a global overflow list chained through 1244 // the klass word of the object's pre-image. 1245 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1246 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1247 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1248 } 1249 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1250 } 1251 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1252 } 1253 1254 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1255 // sparc/solaris for certain applications, but would gain from 1256 // further optimization and tuning efforts, and would almost 1257 // certainly gain from analysis of platform and environment. 1258 void Arguments::set_cms_and_parnew_gc_flags() { 1259 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1260 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1261 1262 // If we are using CMS, we prefer to UseParNewGC, 1263 // unless explicitly forbidden. 1264 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1265 FLAG_SET_ERGO(bool, UseParNewGC, true); 1266 } 1267 1268 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1269 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1270 1271 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1272 // as needed. 1273 if (UseParNewGC) { 1274 set_parnew_gc_flags(); 1275 } 1276 1277 size_t max_heap = align_size_down(MaxHeapSize, 1278 CardTableRS::ct_max_alignment_constraint()); 1279 1280 // Now make adjustments for CMS 1281 intx tenuring_default = (intx)6; 1282 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1283 1284 // Preferred young gen size for "short" pauses: 1285 // upper bound depends on # of threads and NewRatio. 1286 const uintx parallel_gc_threads = 1287 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1288 const size_t preferred_max_new_size_unaligned = 1289 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1290 size_t preferred_max_new_size = 1291 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1292 1293 // Unless explicitly requested otherwise, size young gen 1294 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1295 1296 // If either MaxNewSize or NewRatio is set on the command line, 1297 // assume the user is trying to set the size of the young gen. 1298 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1299 1300 // Set MaxNewSize to our calculated preferred_max_new_size unless 1301 // NewSize was set on the command line and it is larger than 1302 // preferred_max_new_size. 1303 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1304 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1305 } else { 1306 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1307 } 1308 if (PrintGCDetails && Verbose) { 1309 // Too early to use gclog_or_tty 1310 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1311 } 1312 1313 // Code along this path potentially sets NewSize and OldSize 1314 if (PrintGCDetails && Verbose) { 1315 // Too early to use gclog_or_tty 1316 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1317 " initial_heap_size: " SIZE_FORMAT 1318 " max_heap: " SIZE_FORMAT, 1319 min_heap_size(), InitialHeapSize, max_heap); 1320 } 1321 size_t min_new = preferred_max_new_size; 1322 if (FLAG_IS_CMDLINE(NewSize)) { 1323 min_new = NewSize; 1324 } 1325 if (max_heap > min_new && min_heap_size() > min_new) { 1326 // Unless explicitly requested otherwise, make young gen 1327 // at least min_new, and at most preferred_max_new_size. 1328 if (FLAG_IS_DEFAULT(NewSize)) { 1329 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1330 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1331 if (PrintGCDetails && Verbose) { 1332 // Too early to use gclog_or_tty 1333 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1334 } 1335 } 1336 // Unless explicitly requested otherwise, size old gen 1337 // so it's NewRatio x of NewSize. 1338 if (FLAG_IS_DEFAULT(OldSize)) { 1339 if (max_heap > NewSize) { 1340 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1341 if (PrintGCDetails && Verbose) { 1342 // Too early to use gclog_or_tty 1343 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1344 } 1345 } 1346 } 1347 } 1348 } 1349 // Unless explicitly requested otherwise, definitely 1350 // promote all objects surviving "tenuring_default" scavenges. 1351 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1352 FLAG_IS_DEFAULT(SurvivorRatio)) { 1353 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1354 } 1355 // If we decided above (or user explicitly requested) 1356 // `promote all' (via MaxTenuringThreshold := 0), 1357 // prefer minuscule survivor spaces so as not to waste 1358 // space for (non-existent) survivors 1359 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1360 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1361 } 1362 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1363 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1364 // This is done in order to make ParNew+CMS configuration to work 1365 // with YoungPLABSize and OldPLABSize options. 1366 // See CR 6362902. 1367 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1368 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1369 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1370 // is. In this situation let CMSParPromoteBlocksToClaim follow 1371 // the value (either from the command line or ergonomics) of 1372 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1373 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1374 } else { 1375 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1376 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1377 // we'll let it to take precedence. 1378 jio_fprintf(defaultStream::error_stream(), 1379 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1380 " options are specified for the CMS collector." 1381 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1382 } 1383 } 1384 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1385 // OldPLAB sizing manually turned off: Use a larger default setting, 1386 // unless it was manually specified. This is because a too-low value 1387 // will slow down scavenges. 1388 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1389 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1390 } 1391 } 1392 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1393 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1394 // If either of the static initialization defaults have changed, note this 1395 // modification. 1396 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1397 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1398 } 1399 if (PrintGCDetails && Verbose) { 1400 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1401 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1402 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1403 } 1404 } 1405 #endif // INCLUDE_ALL_GCS 1406 1407 void set_object_alignment() { 1408 // Object alignment. 1409 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1410 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1411 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1412 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1413 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1414 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1415 1416 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1417 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1418 1419 // Oop encoding heap max 1420 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1421 1422 #if INCLUDE_ALL_GCS 1423 // Set CMS global values 1424 CompactibleFreeListSpace::set_cms_values(); 1425 #endif // INCLUDE_ALL_GCS 1426 } 1427 1428 bool verify_object_alignment() { 1429 // Object alignment. 1430 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1431 jio_fprintf(defaultStream::error_stream(), 1432 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1433 (int)ObjectAlignmentInBytes); 1434 return false; 1435 } 1436 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1437 jio_fprintf(defaultStream::error_stream(), 1438 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1439 (int)ObjectAlignmentInBytes, BytesPerLong); 1440 return false; 1441 } 1442 // It does not make sense to have big object alignment 1443 // since a space lost due to alignment will be greater 1444 // then a saved space from compressed oops. 1445 if ((int)ObjectAlignmentInBytes > 256) { 1446 jio_fprintf(defaultStream::error_stream(), 1447 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1448 (int)ObjectAlignmentInBytes); 1449 return false; 1450 } 1451 // In case page size is very small. 1452 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1453 jio_fprintf(defaultStream::error_stream(), 1454 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1455 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1456 return false; 1457 } 1458 if(SurvivorAlignmentInBytes == 0) { 1459 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1460 } else { 1461 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1462 jio_fprintf(defaultStream::error_stream(), 1463 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1464 (int)SurvivorAlignmentInBytes); 1465 return false; 1466 } 1467 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1468 jio_fprintf(defaultStream::error_stream(), 1469 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1470 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1471 return false; 1472 } 1473 } 1474 return true; 1475 } 1476 1477 size_t Arguments::max_heap_for_compressed_oops() { 1478 // Avoid sign flip. 1479 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1480 // We need to fit both the NULL page and the heap into the memory budget, while 1481 // keeping alignment constraints of the heap. To guarantee the latter, as the 1482 // NULL page is located before the heap, we pad the NULL page to the conservative 1483 // maximum alignment that the GC may ever impose upon the heap. 1484 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1485 _conservative_max_heap_alignment); 1486 1487 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1488 NOT_LP64(ShouldNotReachHere(); return 0); 1489 } 1490 1491 bool Arguments::should_auto_select_low_pause_collector() { 1492 if (UseAutoGCSelectPolicy && 1493 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1494 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1495 if (PrintGCDetails) { 1496 // Cannot use gclog_or_tty yet. 1497 tty->print_cr("Automatic selection of the low pause collector" 1498 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1499 } 1500 return true; 1501 } 1502 return false; 1503 } 1504 1505 void Arguments::set_use_compressed_oops() { 1506 #ifndef ZERO 1507 #ifdef _LP64 1508 // MaxHeapSize is not set up properly at this point, but 1509 // the only value that can override MaxHeapSize if we are 1510 // to use UseCompressedOops is InitialHeapSize. 1511 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1512 1513 if (max_heap_size <= max_heap_for_compressed_oops()) { 1514 #if !defined(COMPILER1) || defined(TIERED) 1515 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1516 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1517 } 1518 #endif 1519 #ifdef _WIN64 1520 if (UseLargePages && UseCompressedOops) { 1521 // Cannot allocate guard pages for implicit checks in indexed addressing 1522 // mode, when large pages are specified on windows. 1523 // This flag could be switched ON if narrow oop base address is set to 0, 1524 // see code in Universe::initialize_heap(). 1525 Universe::set_narrow_oop_use_implicit_null_checks(false); 1526 } 1527 #endif // _WIN64 1528 } else { 1529 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1530 warning("Max heap size too large for Compressed Oops"); 1531 FLAG_SET_DEFAULT(UseCompressedOops, false); 1532 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1533 } 1534 } 1535 #endif // _LP64 1536 #endif // ZERO 1537 } 1538 1539 1540 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1541 // set_use_compressed_oops(). 1542 void Arguments::set_use_compressed_klass_ptrs() { 1543 #ifndef ZERO 1544 #ifdef _LP64 1545 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1546 if (!UseCompressedOops) { 1547 if (UseCompressedClassPointers) { 1548 warning("UseCompressedClassPointers requires UseCompressedOops"); 1549 } 1550 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1551 } else { 1552 // Turn on UseCompressedClassPointers too 1553 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1554 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1555 } 1556 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1557 if (UseCompressedClassPointers) { 1558 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1559 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1560 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1561 } 1562 } 1563 } 1564 #endif // _LP64 1565 #endif // !ZERO 1566 } 1567 1568 void Arguments::set_conservative_max_heap_alignment() { 1569 // The conservative maximum required alignment for the heap is the maximum of 1570 // the alignments imposed by several sources: any requirements from the heap 1571 // itself, the collector policy and the maximum page size we may run the VM 1572 // with. 1573 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1574 #if INCLUDE_ALL_GCS 1575 if (UseParallelGC) { 1576 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1577 } else if (UseG1GC) { 1578 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1579 } 1580 #endif // INCLUDE_ALL_GCS 1581 _conservative_max_heap_alignment = MAX4(heap_alignment, 1582 (size_t)os::vm_allocation_granularity(), 1583 os::max_page_size(), 1584 CollectorPolicy::compute_heap_alignment()); 1585 } 1586 1587 void Arguments::select_gc_ergonomically() { 1588 if (os::is_server_class_machine()) { 1589 if (should_auto_select_low_pause_collector()) { 1590 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1591 } else { 1592 FLAG_SET_ERGO(bool, UseParallelGC, true); 1593 } 1594 } 1595 } 1596 1597 void Arguments::select_gc() { 1598 if (!gc_selected()) { 1599 ArgumentsExt::select_gc_ergonomically(); 1600 } 1601 } 1602 1603 void Arguments::set_ergonomics_flags() { 1604 select_gc(); 1605 1606 #ifdef COMPILER2 1607 // Shared spaces work fine with other GCs but causes bytecode rewriting 1608 // to be disabled, which hurts interpreter performance and decreases 1609 // server performance. When -server is specified, keep the default off 1610 // unless it is asked for. Future work: either add bytecode rewriting 1611 // at link time, or rewrite bytecodes in non-shared methods. 1612 if (!DumpSharedSpaces && !RequireSharedSpaces && 1613 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1614 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1615 } 1616 #endif 1617 1618 set_conservative_max_heap_alignment(); 1619 1620 #ifndef ZERO 1621 #ifdef _LP64 1622 set_use_compressed_oops(); 1623 1624 // set_use_compressed_klass_ptrs() must be called after calling 1625 // set_use_compressed_oops(). 1626 set_use_compressed_klass_ptrs(); 1627 1628 // Also checks that certain machines are slower with compressed oops 1629 // in vm_version initialization code. 1630 #endif // _LP64 1631 #endif // !ZERO 1632 } 1633 1634 void Arguments::set_parallel_gc_flags() { 1635 assert(UseParallelGC || UseParallelOldGC, "Error"); 1636 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1637 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1638 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1639 } 1640 FLAG_SET_DEFAULT(UseParallelGC, true); 1641 1642 // If no heap maximum was requested explicitly, use some reasonable fraction 1643 // of the physical memory, up to a maximum of 1GB. 1644 FLAG_SET_DEFAULT(ParallelGCThreads, 1645 Abstract_VM_Version::parallel_worker_threads()); 1646 if (ParallelGCThreads == 0) { 1647 jio_fprintf(defaultStream::error_stream(), 1648 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1649 vm_exit(1); 1650 } 1651 1652 if (UseAdaptiveSizePolicy) { 1653 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1654 // unless the user actually sets these flags. 1655 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1656 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1657 _min_heap_free_ratio = MinHeapFreeRatio; 1658 } 1659 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1660 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1661 _max_heap_free_ratio = MaxHeapFreeRatio; 1662 } 1663 } 1664 1665 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1666 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1667 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1668 // See CR 6362902 for details. 1669 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1670 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1671 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1672 } 1673 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1674 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1675 } 1676 } 1677 1678 if (UseParallelOldGC) { 1679 // Par compact uses lower default values since they are treated as 1680 // minimums. These are different defaults because of the different 1681 // interpretation and are not ergonomically set. 1682 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1683 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1684 } 1685 } 1686 } 1687 1688 void Arguments::set_g1_gc_flags() { 1689 assert(UseG1GC, "Error"); 1690 #ifdef COMPILER1 1691 FastTLABRefill = false; 1692 #endif 1693 FLAG_SET_DEFAULT(ParallelGCThreads, 1694 Abstract_VM_Version::parallel_worker_threads()); 1695 if (ParallelGCThreads == 0) { 1696 FLAG_SET_DEFAULT(ParallelGCThreads, 1697 Abstract_VM_Version::parallel_worker_threads()); 1698 } 1699 1700 // MarkStackSize will be set (if it hasn't been set by the user) 1701 // when concurrent marking is initialized. 1702 // Its value will be based upon the number of parallel marking threads. 1703 // But we do set the maximum mark stack size here. 1704 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1705 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1706 } 1707 1708 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1709 // In G1, we want the default GC overhead goal to be higher than 1710 // say in PS. So we set it here to 10%. Otherwise the heap might 1711 // be expanded more aggressively than we would like it to. In 1712 // fact, even 10% seems to not be high enough in some cases 1713 // (especially small GC stress tests that the main thing they do 1714 // is allocation). We might consider increase it further. 1715 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1716 } 1717 1718 if (PrintGCDetails && Verbose) { 1719 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1720 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1721 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1722 } 1723 } 1724 1725 #if !INCLUDE_ALL_GCS 1726 #ifdef ASSERT 1727 static bool verify_serial_gc_flags() { 1728 return (UseSerialGC && 1729 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1730 UseParallelGC || UseParallelOldGC)); 1731 } 1732 #endif // ASSERT 1733 #endif // INCLUDE_ALL_GCS 1734 1735 void Arguments::set_gc_specific_flags() { 1736 #if INCLUDE_ALL_GCS 1737 // Set per-collector flags 1738 if (UseParallelGC || UseParallelOldGC) { 1739 set_parallel_gc_flags(); 1740 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 1741 set_cms_and_parnew_gc_flags(); 1742 } else if (UseParNewGC) { // Skipped if CMS is set above 1743 set_parnew_gc_flags(); 1744 } else if (UseG1GC) { 1745 set_g1_gc_flags(); 1746 } 1747 check_deprecated_gcs(); 1748 check_deprecated_gc_flags(); 1749 if (AssumeMP && !UseSerialGC) { 1750 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1751 warning("If the number of processors is expected to increase from one, then" 1752 " you should configure the number of parallel GC threads appropriately" 1753 " using -XX:ParallelGCThreads=N"); 1754 } 1755 } 1756 if (MinHeapFreeRatio == 100) { 1757 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1758 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1759 } 1760 #else // INCLUDE_ALL_GCS 1761 assert(verify_serial_gc_flags(), "SerialGC unset"); 1762 #endif // INCLUDE_ALL_GCS 1763 } 1764 1765 julong Arguments::limit_by_allocatable_memory(julong limit) { 1766 julong max_allocatable; 1767 julong result = limit; 1768 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1769 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1770 } 1771 return result; 1772 } 1773 1774 // Use static initialization to get the default before parsing 1775 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1776 1777 void Arguments::set_heap_size() { 1778 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1779 // Deprecated flag 1780 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1781 } 1782 1783 const julong phys_mem = 1784 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1785 : (julong)MaxRAM; 1786 1787 // If the maximum heap size has not been set with -Xmx, 1788 // then set it as fraction of the size of physical memory, 1789 // respecting the maximum and minimum sizes of the heap. 1790 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1791 julong reasonable_max = phys_mem / MaxRAMFraction; 1792 1793 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1794 // Small physical memory, so use a minimum fraction of it for the heap 1795 reasonable_max = phys_mem / MinRAMFraction; 1796 } else { 1797 // Not-small physical memory, so require a heap at least 1798 // as large as MaxHeapSize 1799 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1800 } 1801 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1802 // Limit the heap size to ErgoHeapSizeLimit 1803 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1804 } 1805 if (UseCompressedOops) { 1806 // Limit the heap size to the maximum possible when using compressed oops 1807 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1808 1809 // HeapBaseMinAddress can be greater than default but not less than. 1810 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1811 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1812 // matches compressed oops printing flags 1813 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1814 jio_fprintf(defaultStream::error_stream(), 1815 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1816 " (" UINTX_FORMAT "G) which is greater than value given " 1817 UINTX_FORMAT "\n", 1818 DefaultHeapBaseMinAddress, 1819 DefaultHeapBaseMinAddress/G, 1820 HeapBaseMinAddress); 1821 } 1822 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1823 } 1824 } 1825 1826 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1827 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1828 // but it should be not less than default MaxHeapSize. 1829 max_coop_heap -= HeapBaseMinAddress; 1830 } 1831 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1832 } 1833 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1834 1835 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1836 // An initial heap size was specified on the command line, 1837 // so be sure that the maximum size is consistent. Done 1838 // after call to limit_by_allocatable_memory because that 1839 // method might reduce the allocation size. 1840 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1841 } 1842 1843 if (PrintGCDetails && Verbose) { 1844 // Cannot use gclog_or_tty yet. 1845 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1846 } 1847 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1848 } 1849 1850 // If the minimum or initial heap_size have not been set or requested to be set 1851 // ergonomically, set them accordingly. 1852 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1853 julong reasonable_minimum = (julong)(OldSize + NewSize); 1854 1855 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1856 1857 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1858 1859 if (InitialHeapSize == 0) { 1860 julong reasonable_initial = phys_mem / InitialRAMFraction; 1861 1862 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1863 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1864 1865 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1866 1867 if (PrintGCDetails && Verbose) { 1868 // Cannot use gclog_or_tty yet. 1869 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1870 } 1871 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1872 } 1873 // If the minimum heap size has not been set (via -Xms), 1874 // synchronize with InitialHeapSize to avoid errors with the default value. 1875 if (min_heap_size() == 0) { 1876 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1877 if (PrintGCDetails && Verbose) { 1878 // Cannot use gclog_or_tty yet. 1879 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1880 } 1881 } 1882 } 1883 } 1884 1885 // This must be called after ergonomics because we want bytecode rewriting 1886 // if the server compiler is used, or if UseSharedSpaces is disabled. 1887 void Arguments::set_bytecode_flags() { 1888 // Better not attempt to store into a read-only space. 1889 if (UseSharedSpaces) { 1890 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1891 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1892 } 1893 1894 if (!RewriteBytecodes) { 1895 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1896 } 1897 } 1898 1899 // Aggressive optimization flags -XX:+AggressiveOpts 1900 void Arguments::set_aggressive_opts_flags() { 1901 #ifdef COMPILER2 1902 if (AggressiveUnboxing) { 1903 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1904 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1905 } else if (!EliminateAutoBox) { 1906 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1907 AggressiveUnboxing = false; 1908 } 1909 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1910 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1911 } else if (!DoEscapeAnalysis) { 1912 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1913 AggressiveUnboxing = false; 1914 } 1915 } 1916 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1917 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1918 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1919 } 1920 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1921 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1922 } 1923 1924 // Feed the cache size setting into the JDK 1925 char buffer[1024]; 1926 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1927 add_property(buffer); 1928 } 1929 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1930 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1931 } 1932 #endif 1933 1934 if (AggressiveOpts) { 1935 // Sample flag setting code 1936 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1937 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1938 // } 1939 } 1940 } 1941 1942 //=========================================================================================================== 1943 // Parsing of java.compiler property 1944 1945 void Arguments::process_java_compiler_argument(char* arg) { 1946 // For backwards compatibility, Djava.compiler=NONE or "" 1947 // causes us to switch to -Xint mode UNLESS -Xdebug 1948 // is also specified. 1949 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1950 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1951 } 1952 } 1953 1954 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1955 _sun_java_launcher = os::strdup_check_oom(launcher); 1956 } 1957 1958 bool Arguments::created_by_java_launcher() { 1959 assert(_sun_java_launcher != NULL, "property must have value"); 1960 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1961 } 1962 1963 bool Arguments::sun_java_launcher_is_altjvm() { 1964 return _sun_java_launcher_is_altjvm; 1965 } 1966 1967 //=========================================================================================================== 1968 // Parsing of main arguments 1969 1970 bool Arguments::verify_interval(uintx val, uintx min, 1971 uintx max, const char* name) { 1972 // Returns true iff value is in the inclusive interval [min..max] 1973 // false, otherwise. 1974 if (val >= min && val <= max) { 1975 return true; 1976 } 1977 jio_fprintf(defaultStream::error_stream(), 1978 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1979 " and " UINTX_FORMAT "\n", 1980 name, val, min, max); 1981 return false; 1982 } 1983 1984 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1985 // Returns true if given value is at least specified min threshold 1986 // false, otherwise. 1987 if (val >= min ) { 1988 return true; 1989 } 1990 jio_fprintf(defaultStream::error_stream(), 1991 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1992 name, val, min); 1993 return false; 1994 } 1995 1996 bool Arguments::verify_percentage(uintx value, const char* name) { 1997 if (is_percentage(value)) { 1998 return true; 1999 } 2000 jio_fprintf(defaultStream::error_stream(), 2001 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2002 name, value); 2003 return false; 2004 } 2005 2006 // check if do gclog rotation 2007 // +UseGCLogFileRotation is a must, 2008 // no gc log rotation when log file not supplied or 2009 // NumberOfGCLogFiles is 0 2010 void check_gclog_consistency() { 2011 if (UseGCLogFileRotation) { 2012 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2013 jio_fprintf(defaultStream::output_stream(), 2014 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2015 "where num_of_file > 0\n" 2016 "GC log rotation is turned off\n"); 2017 UseGCLogFileRotation = false; 2018 } 2019 } 2020 2021 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2022 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2023 jio_fprintf(defaultStream::output_stream(), 2024 "GCLogFileSize changed to minimum 8K\n"); 2025 } 2026 } 2027 2028 // This function is called for -Xloggc:<filename>, it can be used 2029 // to check if a given file name(or string) conforms to the following 2030 // specification: 2031 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2032 // %p and %t only allowed once. We only limit usage of filename not path 2033 bool is_filename_valid(const char *file_name) { 2034 const char* p = file_name; 2035 char file_sep = os::file_separator()[0]; 2036 const char* cp; 2037 // skip prefix path 2038 for (cp = file_name; *cp != '\0'; cp++) { 2039 if (*cp == '/' || *cp == file_sep) { 2040 p = cp + 1; 2041 } 2042 } 2043 2044 int count_p = 0; 2045 int count_t = 0; 2046 while (*p != '\0') { 2047 if ((*p >= '0' && *p <= '9') || 2048 (*p >= 'A' && *p <= 'Z') || 2049 (*p >= 'a' && *p <= 'z') || 2050 *p == '-' || 2051 *p == '_' || 2052 *p == '.') { 2053 p++; 2054 continue; 2055 } 2056 if (*p == '%') { 2057 if(*(p + 1) == 'p') { 2058 p += 2; 2059 count_p ++; 2060 continue; 2061 } 2062 if (*(p + 1) == 't') { 2063 p += 2; 2064 count_t ++; 2065 continue; 2066 } 2067 } 2068 return false; 2069 } 2070 return count_p < 2 && count_t < 2; 2071 } 2072 2073 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2074 if (!is_percentage(min_heap_free_ratio)) { 2075 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2076 return false; 2077 } 2078 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2079 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2080 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2081 MaxHeapFreeRatio); 2082 return false; 2083 } 2084 // This does not set the flag itself, but stores the value in a safe place for later usage. 2085 _min_heap_free_ratio = min_heap_free_ratio; 2086 return true; 2087 } 2088 2089 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2090 if (!is_percentage(max_heap_free_ratio)) { 2091 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2092 return false; 2093 } 2094 if (max_heap_free_ratio < MinHeapFreeRatio) { 2095 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2096 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2097 MinHeapFreeRatio); 2098 return false; 2099 } 2100 // This does not set the flag itself, but stores the value in a safe place for later usage. 2101 _max_heap_free_ratio = max_heap_free_ratio; 2102 return true; 2103 } 2104 2105 // Check consistency of GC selection 2106 bool Arguments::check_gc_consistency_user() { 2107 check_gclog_consistency(); 2108 bool status = true; 2109 // Ensure that the user has not selected conflicting sets 2110 // of collectors. [Note: this check is merely a user convenience; 2111 // collectors over-ride each other so that only a non-conflicting 2112 // set is selected; however what the user gets is not what they 2113 // may have expected from the combination they asked for. It's 2114 // better to reduce user confusion by not allowing them to 2115 // select conflicting combinations. 2116 uint i = 0; 2117 if (UseSerialGC) i++; 2118 if (UseConcMarkSweepGC || UseParNewGC) i++; 2119 if (UseParallelGC || UseParallelOldGC) i++; 2120 if (UseG1GC) i++; 2121 if (i > 1) { 2122 jio_fprintf(defaultStream::error_stream(), 2123 "Conflicting collector combinations in option list; " 2124 "please refer to the release notes for the combinations " 2125 "allowed\n"); 2126 status = false; 2127 } 2128 return status; 2129 } 2130 2131 void Arguments::check_deprecated_gcs() { 2132 if (UseConcMarkSweepGC && !UseParNewGC) { 2133 warning("Using the DefNew young collector with the CMS collector is deprecated " 2134 "and will likely be removed in a future release"); 2135 } 2136 2137 if (UseParNewGC && !UseConcMarkSweepGC) { 2138 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2139 // set up UseSerialGC properly, so that can't be used in the check here. 2140 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2141 "and will likely be removed in a future release"); 2142 } 2143 2144 if (CMSIncrementalMode) { 2145 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2146 } 2147 } 2148 2149 void Arguments::check_deprecated_gc_flags() { 2150 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2151 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2152 "and will likely be removed in future release"); 2153 } 2154 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2155 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2156 "Use MaxRAMFraction instead."); 2157 } 2158 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2159 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2160 } 2161 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2162 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2163 } 2164 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2165 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2166 } 2167 } 2168 2169 // Check stack pages settings 2170 bool Arguments::check_stack_pages() 2171 { 2172 bool status = true; 2173 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2174 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2175 // greater stack shadow pages can't generate instruction to bang stack 2176 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2177 return status; 2178 } 2179 2180 // Check the consistency of vm_init_args 2181 bool Arguments::check_vm_args_consistency() { 2182 // Method for adding checks for flag consistency. 2183 // The intent is to warn the user of all possible conflicts, 2184 // before returning an error. 2185 // Note: Needs platform-dependent factoring. 2186 bool status = true; 2187 2188 if (TLABRefillWasteFraction == 0) { 2189 jio_fprintf(defaultStream::error_stream(), 2190 "TLABRefillWasteFraction should be a denominator, " 2191 "not " SIZE_FORMAT "\n", 2192 TLABRefillWasteFraction); 2193 status = false; 2194 } 2195 2196 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2197 "AdaptiveSizePolicyWeight"); 2198 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2199 2200 // Divide by bucket size to prevent a large size from causing rollover when 2201 // calculating amount of memory needed to be allocated for the String table. 2202 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2203 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2204 2205 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2206 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2207 2208 { 2209 // Using "else if" below to avoid printing two error messages if min > max. 2210 // This will also prevent us from reporting both min>100 and max>100 at the 2211 // same time, but that is less annoying than printing two identical errors IMHO. 2212 FormatBuffer<80> err_msg("%s",""); 2213 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2214 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2215 status = false; 2216 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2217 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2218 status = false; 2219 } 2220 } 2221 2222 // Min/MaxMetaspaceFreeRatio 2223 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2224 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2225 2226 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2227 jio_fprintf(defaultStream::error_stream(), 2228 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2229 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2230 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2231 MinMetaspaceFreeRatio, 2232 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2233 MaxMetaspaceFreeRatio); 2234 status = false; 2235 } 2236 2237 // Trying to keep 100% free is not practical 2238 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2239 2240 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2241 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2242 } 2243 2244 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2245 // Settings to encourage splitting. 2246 if (!FLAG_IS_CMDLINE(NewRatio)) { 2247 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2248 } 2249 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2250 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2251 } 2252 } 2253 2254 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2255 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2256 } 2257 2258 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2259 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2260 if (GCTimeLimit == 100) { 2261 // Turn off gc-overhead-limit-exceeded checks 2262 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2263 } 2264 2265 status = status && ArgumentsExt::check_gc_consistency_user(); 2266 status = status && check_stack_pages(); 2267 2268 if (CMSIncrementalMode) { 2269 if (!UseConcMarkSweepGC) { 2270 jio_fprintf(defaultStream::error_stream(), 2271 "error: invalid argument combination.\n" 2272 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2273 "selected in order\nto use CMSIncrementalMode.\n"); 2274 status = false; 2275 } else { 2276 status = status && verify_percentage(CMSIncrementalDutyCycle, 2277 "CMSIncrementalDutyCycle"); 2278 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2279 "CMSIncrementalDutyCycleMin"); 2280 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2281 "CMSIncrementalSafetyFactor"); 2282 status = status && verify_percentage(CMSIncrementalOffset, 2283 "CMSIncrementalOffset"); 2284 status = status && verify_percentage(CMSExpAvgFactor, 2285 "CMSExpAvgFactor"); 2286 // If it was not set on the command line, set 2287 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2288 if (CMSInitiatingOccupancyFraction < 0) { 2289 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2290 } 2291 } 2292 } 2293 2294 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2295 // insists that we hold the requisite locks so that the iteration is 2296 // MT-safe. For the verification at start-up and shut-down, we don't 2297 // yet have a good way of acquiring and releasing these locks, 2298 // which are not visible at the CollectedHeap level. We want to 2299 // be able to acquire these locks and then do the iteration rather 2300 // than just disable the lock verification. This will be fixed under 2301 // bug 4788986. 2302 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2303 if (VerifyDuringStartup) { 2304 warning("Heap verification at start-up disabled " 2305 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2306 VerifyDuringStartup = false; // Disable verification at start-up 2307 } 2308 2309 if (VerifyBeforeExit) { 2310 warning("Heap verification at shutdown disabled " 2311 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2312 VerifyBeforeExit = false; // Disable verification at shutdown 2313 } 2314 } 2315 2316 // Note: only executed in non-PRODUCT mode 2317 if (!UseAsyncConcMarkSweepGC && 2318 (ExplicitGCInvokesConcurrent || 2319 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2320 jio_fprintf(defaultStream::error_stream(), 2321 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2322 " with -UseAsyncConcMarkSweepGC"); 2323 status = false; 2324 } 2325 2326 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2327 2328 #if INCLUDE_ALL_GCS 2329 if (UseG1GC) { 2330 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2331 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2332 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2333 2334 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2335 "InitiatingHeapOccupancyPercent"); 2336 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2337 "G1RefProcDrainInterval"); 2338 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2339 "G1ConcMarkStepDurationMillis"); 2340 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2341 "G1ConcRSHotCardLimit"); 2342 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2343 "G1ConcRSLogCacheSize"); 2344 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2345 "StringDeduplicationAgeThreshold"); 2346 } 2347 if (UseConcMarkSweepGC) { 2348 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2349 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2350 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2351 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2352 2353 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2354 2355 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2356 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2357 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2358 2359 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2360 2361 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2362 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2363 2364 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2365 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2366 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2367 2368 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2369 2370 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2371 2372 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2373 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2374 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2375 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2376 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2377 } 2378 2379 if (UseParallelGC || UseParallelOldGC) { 2380 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2381 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2382 2383 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2384 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2385 2386 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2387 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2388 2389 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2390 2391 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2392 } 2393 #endif // INCLUDE_ALL_GCS 2394 2395 status = status && verify_interval(RefDiscoveryPolicy, 2396 ReferenceProcessor::DiscoveryPolicyMin, 2397 ReferenceProcessor::DiscoveryPolicyMax, 2398 "RefDiscoveryPolicy"); 2399 2400 // Limit the lower bound of this flag to 1 as it is used in a division 2401 // expression. 2402 status = status && verify_interval(TLABWasteTargetPercent, 2403 1, 100, "TLABWasteTargetPercent"); 2404 2405 status = status && verify_object_alignment(); 2406 2407 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2408 "CompressedClassSpaceSize"); 2409 2410 status = status && verify_interval(MarkStackSizeMax, 2411 1, (max_jint - 1), "MarkStackSizeMax"); 2412 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2413 2414 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2415 2416 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2417 2418 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2419 2420 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2421 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2422 2423 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2424 2425 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2426 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2427 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2428 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2429 2430 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2431 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2432 2433 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2434 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2435 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2436 2437 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2438 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2439 2440 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2441 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2442 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2443 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2444 2445 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2446 #ifdef COMPILER1 2447 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2448 #endif 2449 2450 if (PrintNMTStatistics) { 2451 #if INCLUDE_NMT 2452 if (MemTracker::tracking_level() == NMT_off) { 2453 #endif // INCLUDE_NMT 2454 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2455 PrintNMTStatistics = false; 2456 #if INCLUDE_NMT 2457 } 2458 #endif 2459 } 2460 2461 // Need to limit the extent of the padding to reasonable size. 2462 // 8K is well beyond the reasonable HW cache line size, even with the 2463 // aggressive prefetching, while still leaving the room for segregating 2464 // among the distinct pages. 2465 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2466 jio_fprintf(defaultStream::error_stream(), 2467 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2468 ContendedPaddingWidth, 0, 8192); 2469 status = false; 2470 } 2471 2472 // Need to enforce the padding not to break the existing field alignments. 2473 // It is sufficient to check against the largest type size. 2474 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2475 jio_fprintf(defaultStream::error_stream(), 2476 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2477 ContendedPaddingWidth, BytesPerLong); 2478 status = false; 2479 } 2480 2481 // Check lower bounds of the code cache 2482 // Template Interpreter code is approximately 3X larger in debug builds. 2483 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2484 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2485 jio_fprintf(defaultStream::error_stream(), 2486 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2487 os::vm_page_size()/K); 2488 status = false; 2489 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2490 jio_fprintf(defaultStream::error_stream(), 2491 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2492 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2493 status = false; 2494 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2495 jio_fprintf(defaultStream::error_stream(), 2496 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2497 min_code_cache_size/K); 2498 status = false; 2499 } else if (ReservedCodeCacheSize > 2*G) { 2500 // Code cache size larger than MAXINT is not supported. 2501 jio_fprintf(defaultStream::error_stream(), 2502 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2503 (2*G)/M); 2504 status = false; 2505 } else if (NonMethodCodeHeapSize < min_code_cache_size){ 2506 jio_fprintf(defaultStream::error_stream(), 2507 "Invalid NonMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonMethodCodeHeapSize/K, 2508 min_code_cache_size/K); 2509 status = false; 2510 } else if ((!FLAG_IS_DEFAULT(NonMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2511 && (NonMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2512 jio_fprintf(defaultStream::error_stream(), 2513 "Invalid code heap sizes: NonMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2514 NonMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2515 (NonMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2516 status = false; 2517 } 2518 2519 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2520 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2521 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2522 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2523 2524 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2525 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2526 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2527 // Check the minimum number of compiler threads 2528 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2529 2530 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2531 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2532 } 2533 2534 return status; 2535 } 2536 2537 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2538 const char* option_type) { 2539 if (ignore) return false; 2540 2541 const char* spacer = " "; 2542 if (option_type == NULL) { 2543 option_type = ++spacer; // Set both to the empty string. 2544 } 2545 2546 if (os::obsolete_option(option)) { 2547 jio_fprintf(defaultStream::error_stream(), 2548 "Obsolete %s%soption: %s\n", option_type, spacer, 2549 option->optionString); 2550 return false; 2551 } else { 2552 jio_fprintf(defaultStream::error_stream(), 2553 "Unrecognized %s%soption: %s\n", option_type, spacer, 2554 option->optionString); 2555 return true; 2556 } 2557 } 2558 2559 static const char* user_assertion_options[] = { 2560 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2561 }; 2562 2563 static const char* system_assertion_options[] = { 2564 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2565 }; 2566 2567 // Return true if any of the strings in null-terminated array 'names' matches. 2568 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2569 // the option must match exactly. 2570 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2571 bool tail_allowed) { 2572 for (/* empty */; *names != NULL; ++names) { 2573 if (match_option(option, *names, tail)) { 2574 if (**tail == '\0' || tail_allowed && **tail == ':') { 2575 return true; 2576 } 2577 } 2578 } 2579 return false; 2580 } 2581 2582 bool Arguments::parse_uintx(const char* value, 2583 uintx* uintx_arg, 2584 uintx min_size) { 2585 2586 // Check the sign first since atomull() parses only unsigned values. 2587 bool value_is_positive = !(*value == '-'); 2588 2589 if (value_is_positive) { 2590 julong n; 2591 bool good_return = atomull(value, &n); 2592 if (good_return) { 2593 bool above_minimum = n >= min_size; 2594 bool value_is_too_large = n > max_uintx; 2595 2596 if (above_minimum && !value_is_too_large) { 2597 *uintx_arg = n; 2598 return true; 2599 } 2600 } 2601 } 2602 return false; 2603 } 2604 2605 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2606 julong* long_arg, 2607 julong min_size) { 2608 if (!atomull(s, long_arg)) return arg_unreadable; 2609 return check_memory_size(*long_arg, min_size); 2610 } 2611 2612 // Parse JavaVMInitArgs structure 2613 2614 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2615 // For components of the system classpath. 2616 SysClassPath scp(Arguments::get_sysclasspath()); 2617 bool scp_assembly_required = false; 2618 2619 // Save default settings for some mode flags 2620 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2621 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2622 Arguments::_ClipInlining = ClipInlining; 2623 Arguments::_BackgroundCompilation = BackgroundCompilation; 2624 2625 // Setup flags for mixed which is the default 2626 set_mode_flags(_mixed); 2627 2628 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2629 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2630 if (result != JNI_OK) { 2631 return result; 2632 } 2633 2634 // Parse JavaVMInitArgs structure passed in 2635 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2636 if (result != JNI_OK) { 2637 return result; 2638 } 2639 2640 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2641 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2642 if (result != JNI_OK) { 2643 return result; 2644 } 2645 2646 // Do final processing now that all arguments have been parsed 2647 result = finalize_vm_init_args(&scp, scp_assembly_required); 2648 if (result != JNI_OK) { 2649 return result; 2650 } 2651 2652 return JNI_OK; 2653 } 2654 2655 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2656 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2657 // are dealing with -agentpath (case where name is a path), otherwise with 2658 // -agentlib 2659 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2660 char *_name; 2661 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2662 size_t _len_hprof, _len_jdwp, _len_prefix; 2663 2664 if (is_path) { 2665 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2666 return false; 2667 } 2668 2669 _name++; // skip past last path separator 2670 _len_prefix = strlen(JNI_LIB_PREFIX); 2671 2672 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2673 return false; 2674 } 2675 2676 _name += _len_prefix; 2677 _len_hprof = strlen(_hprof); 2678 _len_jdwp = strlen(_jdwp); 2679 2680 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2681 _name += _len_hprof; 2682 } 2683 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2684 _name += _len_jdwp; 2685 } 2686 else { 2687 return false; 2688 } 2689 2690 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2691 return false; 2692 } 2693 2694 return true; 2695 } 2696 2697 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2698 return true; 2699 } 2700 2701 return false; 2702 } 2703 2704 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2705 SysClassPath* scp_p, 2706 bool* scp_assembly_required_p, 2707 Flag::Flags origin) { 2708 // Remaining part of option string 2709 const char* tail; 2710 2711 // iterate over arguments 2712 for (int index = 0; index < args->nOptions; index++) { 2713 bool is_absolute_path = false; // for -agentpath vs -agentlib 2714 2715 const JavaVMOption* option = args->options + index; 2716 2717 if (!match_option(option, "-Djava.class.path", &tail) && 2718 !match_option(option, "-Dsun.java.command", &tail) && 2719 !match_option(option, "-Dsun.java.launcher", &tail)) { 2720 2721 // add all jvm options to the jvm_args string. This string 2722 // is used later to set the java.vm.args PerfData string constant. 2723 // the -Djava.class.path and the -Dsun.java.command options are 2724 // omitted from jvm_args string as each have their own PerfData 2725 // string constant object. 2726 build_jvm_args(option->optionString); 2727 } 2728 2729 // -verbose:[class/gc/jni] 2730 if (match_option(option, "-verbose", &tail)) { 2731 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2732 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2733 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2734 } else if (!strcmp(tail, ":gc")) { 2735 FLAG_SET_CMDLINE(bool, PrintGC, true); 2736 } else if (!strcmp(tail, ":jni")) { 2737 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2738 } 2739 // -da / -ea / -disableassertions / -enableassertions 2740 // These accept an optional class/package name separated by a colon, e.g., 2741 // -da:java.lang.Thread. 2742 } else if (match_option(option, user_assertion_options, &tail, true)) { 2743 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2744 if (*tail == '\0') { 2745 JavaAssertions::setUserClassDefault(enable); 2746 } else { 2747 assert(*tail == ':', "bogus match by match_option()"); 2748 JavaAssertions::addOption(tail + 1, enable); 2749 } 2750 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2751 } else if (match_option(option, system_assertion_options, &tail, false)) { 2752 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2753 JavaAssertions::setSystemClassDefault(enable); 2754 // -bootclasspath: 2755 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2756 scp_p->reset_path(tail); 2757 *scp_assembly_required_p = true; 2758 // -bootclasspath/a: 2759 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2760 scp_p->add_suffix(tail); 2761 *scp_assembly_required_p = true; 2762 // -bootclasspath/p: 2763 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2764 scp_p->add_prefix(tail); 2765 *scp_assembly_required_p = true; 2766 // -Xrun 2767 } else if (match_option(option, "-Xrun", &tail)) { 2768 if (tail != NULL) { 2769 const char* pos = strchr(tail, ':'); 2770 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2771 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2772 name[len] = '\0'; 2773 2774 char *options = NULL; 2775 if(pos != NULL) { 2776 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2777 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2778 } 2779 #if !INCLUDE_JVMTI 2780 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2781 jio_fprintf(defaultStream::error_stream(), 2782 "Profiling and debugging agents are not supported in this VM\n"); 2783 return JNI_ERR; 2784 } 2785 #endif // !INCLUDE_JVMTI 2786 add_init_library(name, options); 2787 } 2788 // -agentlib and -agentpath 2789 } else if (match_option(option, "-agentlib:", &tail) || 2790 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2791 if(tail != NULL) { 2792 const char* pos = strchr(tail, '='); 2793 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2794 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2795 name[len] = '\0'; 2796 2797 char *options = NULL; 2798 if(pos != NULL) { 2799 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2800 } 2801 #if !INCLUDE_JVMTI 2802 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2803 jio_fprintf(defaultStream::error_stream(), 2804 "Profiling and debugging agents are not supported in this VM\n"); 2805 return JNI_ERR; 2806 } 2807 #endif // !INCLUDE_JVMTI 2808 add_init_agent(name, options, is_absolute_path); 2809 } 2810 // -javaagent 2811 } else if (match_option(option, "-javaagent:", &tail)) { 2812 #if !INCLUDE_JVMTI 2813 jio_fprintf(defaultStream::error_stream(), 2814 "Instrumentation agents are not supported in this VM\n"); 2815 return JNI_ERR; 2816 #else 2817 if(tail != NULL) { 2818 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2819 add_init_agent("instrument", options, false); 2820 } 2821 #endif // !INCLUDE_JVMTI 2822 // -Xnoclassgc 2823 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2824 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2825 // -Xincgc: i-CMS 2826 } else if (match_option(option, "-Xincgc", &tail)) { 2827 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2828 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2829 // -Xnoincgc: no i-CMS 2830 } else if (match_option(option, "-Xnoincgc", &tail)) { 2831 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2832 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2833 // -Xconcgc 2834 } else if (match_option(option, "-Xconcgc", &tail)) { 2835 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2836 // -Xnoconcgc 2837 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2838 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2839 // -Xbatch 2840 } else if (match_option(option, "-Xbatch", &tail)) { 2841 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2842 // -Xmn for compatibility with other JVM vendors 2843 } else if (match_option(option, "-Xmn", &tail)) { 2844 julong long_initial_young_size = 0; 2845 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2846 if (errcode != arg_in_range) { 2847 jio_fprintf(defaultStream::error_stream(), 2848 "Invalid initial young generation size: %s\n", option->optionString); 2849 describe_range_error(errcode); 2850 return JNI_EINVAL; 2851 } 2852 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2853 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2854 // -Xms 2855 } else if (match_option(option, "-Xms", &tail)) { 2856 julong long_initial_heap_size = 0; 2857 // an initial heap size of 0 means automatically determine 2858 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2859 if (errcode != arg_in_range) { 2860 jio_fprintf(defaultStream::error_stream(), 2861 "Invalid initial heap size: %s\n", option->optionString); 2862 describe_range_error(errcode); 2863 return JNI_EINVAL; 2864 } 2865 set_min_heap_size((uintx)long_initial_heap_size); 2866 // Currently the minimum size and the initial heap sizes are the same. 2867 // Can be overridden with -XX:InitialHeapSize. 2868 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2869 // -Xmx 2870 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2871 julong long_max_heap_size = 0; 2872 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2873 if (errcode != arg_in_range) { 2874 jio_fprintf(defaultStream::error_stream(), 2875 "Invalid maximum heap size: %s\n", option->optionString); 2876 describe_range_error(errcode); 2877 return JNI_EINVAL; 2878 } 2879 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2880 // Xmaxf 2881 } else if (match_option(option, "-Xmaxf", &tail)) { 2882 char* err; 2883 int maxf = (int)(strtod(tail, &err) * 100); 2884 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2885 jio_fprintf(defaultStream::error_stream(), 2886 "Bad max heap free percentage size: %s\n", 2887 option->optionString); 2888 return JNI_EINVAL; 2889 } else { 2890 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2891 } 2892 // Xminf 2893 } else if (match_option(option, "-Xminf", &tail)) { 2894 char* err; 2895 int minf = (int)(strtod(tail, &err) * 100); 2896 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2897 jio_fprintf(defaultStream::error_stream(), 2898 "Bad min heap free percentage size: %s\n", 2899 option->optionString); 2900 return JNI_EINVAL; 2901 } else { 2902 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2903 } 2904 // -Xss 2905 } else if (match_option(option, "-Xss", &tail)) { 2906 julong long_ThreadStackSize = 0; 2907 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2908 if (errcode != arg_in_range) { 2909 jio_fprintf(defaultStream::error_stream(), 2910 "Invalid thread stack size: %s\n", option->optionString); 2911 describe_range_error(errcode); 2912 return JNI_EINVAL; 2913 } 2914 // Internally track ThreadStackSize in units of 1024 bytes. 2915 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2916 round_to((int)long_ThreadStackSize, K) / K); 2917 // -Xoss 2918 } else if (match_option(option, "-Xoss", &tail)) { 2919 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2920 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2921 julong long_CodeCacheExpansionSize = 0; 2922 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2923 if (errcode != arg_in_range) { 2924 jio_fprintf(defaultStream::error_stream(), 2925 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2926 os::vm_page_size()/K); 2927 return JNI_EINVAL; 2928 } 2929 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2930 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2931 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2932 julong long_ReservedCodeCacheSize = 0; 2933 2934 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2935 if (errcode != arg_in_range) { 2936 jio_fprintf(defaultStream::error_stream(), 2937 "Invalid maximum code cache size: %s.\n", option->optionString); 2938 return JNI_EINVAL; 2939 } 2940 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2941 // -XX:NonMethodCodeHeapSize= 2942 } else if (match_option(option, "-XX:NonMethodCodeHeapSize=", &tail)) { 2943 julong long_NonMethodCodeHeapSize = 0; 2944 2945 ArgsRange errcode = parse_memory_size(tail, &long_NonMethodCodeHeapSize, 1); 2946 if (errcode != arg_in_range) { 2947 jio_fprintf(defaultStream::error_stream(), 2948 "Invalid maximum non-method code heap size: %s.\n", option->optionString); 2949 return JNI_EINVAL; 2950 } 2951 FLAG_SET_CMDLINE(uintx, NonMethodCodeHeapSize, (uintx)long_NonMethodCodeHeapSize); 2952 // -XX:ProfiledCodeHeapSize= 2953 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2954 julong long_ProfiledCodeHeapSize = 0; 2955 2956 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2957 if (errcode != arg_in_range) { 2958 jio_fprintf(defaultStream::error_stream(), 2959 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2960 return JNI_EINVAL; 2961 } 2962 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2963 // -XX:NonProfiledCodeHeapSizee= 2964 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2965 julong long_NonProfiledCodeHeapSize = 0; 2966 2967 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2968 if (errcode != arg_in_range) { 2969 jio_fprintf(defaultStream::error_stream(), 2970 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2971 return JNI_EINVAL; 2972 } 2973 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2974 //-XX:IncreaseFirstTierCompileThresholdAt= 2975 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2976 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2977 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2978 jio_fprintf(defaultStream::error_stream(), 2979 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2980 option->optionString); 2981 return JNI_EINVAL; 2982 } 2983 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2984 // -green 2985 } else if (match_option(option, "-green", &tail)) { 2986 jio_fprintf(defaultStream::error_stream(), 2987 "Green threads support not available\n"); 2988 return JNI_EINVAL; 2989 // -native 2990 } else if (match_option(option, "-native", &tail)) { 2991 // HotSpot always uses native threads, ignore silently for compatibility 2992 // -Xsqnopause 2993 } else if (match_option(option, "-Xsqnopause", &tail)) { 2994 // EVM option, ignore silently for compatibility 2995 // -Xrs 2996 } else if (match_option(option, "-Xrs", &tail)) { 2997 // Classic/EVM option, new functionality 2998 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2999 } else if (match_option(option, "-Xusealtsigs", &tail)) { 3000 // change default internal VM signals used - lower case for back compat 3001 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 3002 // -Xoptimize 3003 } else if (match_option(option, "-Xoptimize", &tail)) { 3004 // EVM option, ignore silently for compatibility 3005 // -Xprof 3006 } else if (match_option(option, "-Xprof", &tail)) { 3007 #if INCLUDE_FPROF 3008 _has_profile = true; 3009 #else // INCLUDE_FPROF 3010 jio_fprintf(defaultStream::error_stream(), 3011 "Flat profiling is not supported in this VM.\n"); 3012 return JNI_ERR; 3013 #endif // INCLUDE_FPROF 3014 // -Xconcurrentio 3015 } else if (match_option(option, "-Xconcurrentio", &tail)) { 3016 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 3017 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 3018 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 3019 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3020 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 3021 3022 // -Xinternalversion 3023 } else if (match_option(option, "-Xinternalversion", &tail)) { 3024 jio_fprintf(defaultStream::output_stream(), "%s\n", 3025 VM_Version::internal_vm_info_string()); 3026 vm_exit(0); 3027 #ifndef PRODUCT 3028 // -Xprintflags 3029 } else if (match_option(option, "-Xprintflags", &tail)) { 3030 CommandLineFlags::printFlags(tty, false); 3031 vm_exit(0); 3032 #endif 3033 // -D 3034 } else if (match_option(option, "-D", &tail)) { 3035 if (!add_property(tail)) { 3036 return JNI_ENOMEM; 3037 } 3038 // Out of the box management support 3039 if (match_option(option, "-Dcom.sun.management", &tail)) { 3040 #if INCLUDE_MANAGEMENT 3041 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3042 #else 3043 jio_fprintf(defaultStream::output_stream(), 3044 "-Dcom.sun.management is not supported in this VM.\n"); 3045 return JNI_ERR; 3046 #endif 3047 } 3048 // -Xint 3049 } else if (match_option(option, "-Xint", &tail)) { 3050 set_mode_flags(_int); 3051 // -Xmixed 3052 } else if (match_option(option, "-Xmixed", &tail)) { 3053 set_mode_flags(_mixed); 3054 // -Xcomp 3055 } else if (match_option(option, "-Xcomp", &tail)) { 3056 // for testing the compiler; turn off all flags that inhibit compilation 3057 set_mode_flags(_comp); 3058 // -Xshare:dump 3059 } else if (match_option(option, "-Xshare:dump", &tail)) { 3060 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3061 set_mode_flags(_int); // Prevent compilation, which creates objects 3062 // -Xshare:on 3063 } else if (match_option(option, "-Xshare:on", &tail)) { 3064 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3065 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3066 // -Xshare:auto 3067 } else if (match_option(option, "-Xshare:auto", &tail)) { 3068 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3069 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3070 // -Xshare:off 3071 } else if (match_option(option, "-Xshare:off", &tail)) { 3072 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3073 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3074 // -Xverify 3075 } else if (match_option(option, "-Xverify", &tail)) { 3076 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3077 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3078 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3079 } else if (strcmp(tail, ":remote") == 0) { 3080 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3081 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3082 } else if (strcmp(tail, ":none") == 0) { 3083 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3084 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3085 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3086 return JNI_EINVAL; 3087 } 3088 // -Xdebug 3089 } else if (match_option(option, "-Xdebug", &tail)) { 3090 // note this flag has been used, then ignore 3091 set_xdebug_mode(true); 3092 // -Xnoagent 3093 } else if (match_option(option, "-Xnoagent", &tail)) { 3094 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3095 } else if (match_option(option, "-Xboundthreads", &tail)) { 3096 // Bind user level threads to kernel threads (Solaris only) 3097 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3098 } else if (match_option(option, "-Xloggc:", &tail)) { 3099 // Redirect GC output to the file. -Xloggc:<filename> 3100 // ostream_init_log(), when called will use this filename 3101 // to initialize a fileStream. 3102 _gc_log_filename = os::strdup_check_oom(tail); 3103 if (!is_filename_valid(_gc_log_filename)) { 3104 jio_fprintf(defaultStream::output_stream(), 3105 "Invalid file name for use with -Xloggc: Filename can only contain the " 3106 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3107 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3108 return JNI_EINVAL; 3109 } 3110 FLAG_SET_CMDLINE(bool, PrintGC, true); 3111 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3112 3113 // JNI hooks 3114 } else if (match_option(option, "-Xcheck", &tail)) { 3115 if (!strcmp(tail, ":jni")) { 3116 #if !INCLUDE_JNI_CHECK 3117 warning("JNI CHECKING is not supported in this VM"); 3118 #else 3119 CheckJNICalls = true; 3120 #endif // INCLUDE_JNI_CHECK 3121 } else if (is_bad_option(option, args->ignoreUnrecognized, 3122 "check")) { 3123 return JNI_EINVAL; 3124 } 3125 } else if (match_option(option, "vfprintf", &tail)) { 3126 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3127 } else if (match_option(option, "exit", &tail)) { 3128 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3129 } else if (match_option(option, "abort", &tail)) { 3130 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3131 // -XX:+AggressiveHeap 3132 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 3133 3134 // This option inspects the machine and attempts to set various 3135 // parameters to be optimal for long-running, memory allocation 3136 // intensive jobs. It is intended for machines with large 3137 // amounts of cpu and memory. 3138 3139 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3140 // VM, but we may not be able to represent the total physical memory 3141 // available (like having 8gb of memory on a box but using a 32bit VM). 3142 // Thus, we need to make sure we're using a julong for intermediate 3143 // calculations. 3144 julong initHeapSize; 3145 julong total_memory = os::physical_memory(); 3146 3147 if (total_memory < (julong)256*M) { 3148 jio_fprintf(defaultStream::error_stream(), 3149 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3150 vm_exit(1); 3151 } 3152 3153 // The heap size is half of available memory, or (at most) 3154 // all of possible memory less 160mb (leaving room for the OS 3155 // when using ISM). This is the maximum; because adaptive sizing 3156 // is turned on below, the actual space used may be smaller. 3157 3158 initHeapSize = MIN2(total_memory / (julong)2, 3159 total_memory - (julong)160*M); 3160 3161 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3162 3163 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3164 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3165 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3166 // Currently the minimum size and the initial heap sizes are the same. 3167 set_min_heap_size(initHeapSize); 3168 } 3169 if (FLAG_IS_DEFAULT(NewSize)) { 3170 // Make the young generation 3/8ths of the total heap. 3171 FLAG_SET_CMDLINE(uintx, NewSize, 3172 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3173 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3174 } 3175 3176 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3177 FLAG_SET_DEFAULT(UseLargePages, true); 3178 #endif 3179 3180 // Increase some data structure sizes for efficiency 3181 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3182 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3183 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3184 3185 // See the OldPLABSize comment below, but replace 'after promotion' 3186 // with 'after copying'. YoungPLABSize is the size of the survivor 3187 // space per-gc-thread buffers. The default is 4kw. 3188 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3189 3190 // OldPLABSize is the size of the buffers in the old gen that 3191 // UseParallelGC uses to promote live data that doesn't fit in the 3192 // survivor spaces. At any given time, there's one for each gc thread. 3193 // The default size is 1kw. These buffers are rarely used, since the 3194 // survivor spaces are usually big enough. For specjbb, however, there 3195 // are occasions when there's lots of live data in the young gen 3196 // and we end up promoting some of it. We don't have a definite 3197 // explanation for why bumping OldPLABSize helps, but the theory 3198 // is that a bigger PLAB results in retaining something like the 3199 // original allocation order after promotion, which improves mutator 3200 // locality. A minor effect may be that larger PLABs reduce the 3201 // number of PLAB allocation events during gc. The value of 8kw 3202 // was arrived at by experimenting with specjbb. 3203 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3204 3205 // Enable parallel GC and adaptive generation sizing 3206 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3207 FLAG_SET_DEFAULT(ParallelGCThreads, 3208 Abstract_VM_Version::parallel_worker_threads()); 3209 3210 // Encourage steady state memory management 3211 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3212 3213 // This appears to improve mutator locality 3214 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3215 3216 // Get around early Solaris scheduling bug 3217 // (affinity vs other jobs on system) 3218 // but disallow DR and offlining (5008695). 3219 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3220 3221 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3222 // and the last option wins. 3223 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3224 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3225 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3226 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3227 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3228 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3229 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3230 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3231 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3232 uintx max_tenuring_thresh = 0; 3233 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3234 jio_fprintf(defaultStream::error_stream(), 3235 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3236 } 3237 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3238 3239 if (MaxTenuringThreshold == 0) { 3240 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3241 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3242 } else { 3243 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3244 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3245 } 3246 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3247 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3248 jio_fprintf(defaultStream::error_stream(), 3249 "Please use CMSClassUnloadingEnabled in place of " 3250 "CMSPermGenSweepingEnabled in the future\n"); 3251 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3252 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3253 jio_fprintf(defaultStream::error_stream(), 3254 "Please use -XX:+UseGCOverheadLimit in place of " 3255 "-XX:+UseGCTimeLimit in the future\n"); 3256 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3257 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3258 jio_fprintf(defaultStream::error_stream(), 3259 "Please use -XX:-UseGCOverheadLimit in place of " 3260 "-XX:-UseGCTimeLimit in the future\n"); 3261 // The TLE options are for compatibility with 1.3 and will be 3262 // removed without notice in a future release. These options 3263 // are not to be documented. 3264 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3265 // No longer used. 3266 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3267 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3268 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3269 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3270 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3271 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3272 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3273 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3274 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3275 // No longer used. 3276 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3277 julong long_tlab_size = 0; 3278 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3279 if (errcode != arg_in_range) { 3280 jio_fprintf(defaultStream::error_stream(), 3281 "Invalid TLAB size: %s\n", option->optionString); 3282 describe_range_error(errcode); 3283 return JNI_EINVAL; 3284 } 3285 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3286 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3287 // No longer used. 3288 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3289 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3290 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3291 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3292 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3293 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3294 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3295 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3296 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3297 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3298 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3299 #if defined(DTRACE_ENABLED) 3300 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3301 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3302 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3303 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3304 #else // defined(DTRACE_ENABLED) 3305 jio_fprintf(defaultStream::error_stream(), 3306 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3307 return JNI_EINVAL; 3308 #endif // defined(DTRACE_ENABLED) 3309 #ifdef ASSERT 3310 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3311 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3312 // disable scavenge before parallel mark-compact 3313 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3314 #endif 3315 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &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:CMSParPromoteBlocksToClaim in the future\n"); 3321 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3322 julong cms_blocks_to_claim = (julong)atol(tail); 3323 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3324 jio_fprintf(defaultStream::error_stream(), 3325 "Please use -XX:OldPLABSize in place of " 3326 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3327 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3328 julong old_plab_size = 0; 3329 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3330 if (errcode != arg_in_range) { 3331 jio_fprintf(defaultStream::error_stream(), 3332 "Invalid old PLAB size: %s\n", option->optionString); 3333 describe_range_error(errcode); 3334 return JNI_EINVAL; 3335 } 3336 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3337 jio_fprintf(defaultStream::error_stream(), 3338 "Please use -XX:OldPLABSize in place of " 3339 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3340 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3341 julong young_plab_size = 0; 3342 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3343 if (errcode != arg_in_range) { 3344 jio_fprintf(defaultStream::error_stream(), 3345 "Invalid young PLAB size: %s\n", option->optionString); 3346 describe_range_error(errcode); 3347 return JNI_EINVAL; 3348 } 3349 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3350 jio_fprintf(defaultStream::error_stream(), 3351 "Please use -XX:YoungPLABSize in place of " 3352 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3353 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3354 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3355 julong stack_size = 0; 3356 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3357 if (errcode != arg_in_range) { 3358 jio_fprintf(defaultStream::error_stream(), 3359 "Invalid mark stack size: %s\n", option->optionString); 3360 describe_range_error(errcode); 3361 return JNI_EINVAL; 3362 } 3363 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3364 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3365 julong max_stack_size = 0; 3366 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3367 if (errcode != arg_in_range) { 3368 jio_fprintf(defaultStream::error_stream(), 3369 "Invalid maximum mark stack size: %s\n", 3370 option->optionString); 3371 describe_range_error(errcode); 3372 return JNI_EINVAL; 3373 } 3374 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3375 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3376 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3377 uintx conc_threads = 0; 3378 if (!parse_uintx(tail, &conc_threads, 1)) { 3379 jio_fprintf(defaultStream::error_stream(), 3380 "Invalid concurrent threads: %s\n", option->optionString); 3381 return JNI_EINVAL; 3382 } 3383 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3384 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3385 julong max_direct_memory_size = 0; 3386 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3387 if (errcode != arg_in_range) { 3388 jio_fprintf(defaultStream::error_stream(), 3389 "Invalid maximum direct memory size: %s\n", 3390 option->optionString); 3391 describe_range_error(errcode); 3392 return JNI_EINVAL; 3393 } 3394 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3395 #if !INCLUDE_MANAGEMENT 3396 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3397 jio_fprintf(defaultStream::error_stream(), 3398 "ManagementServer is not supported in this VM.\n"); 3399 return JNI_ERR; 3400 #endif // INCLUDE_MANAGEMENT 3401 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3402 // Skip -XX:Flags= since that case has already been handled 3403 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3404 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3405 return JNI_EINVAL; 3406 } 3407 } 3408 // Unknown option 3409 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3410 return JNI_ERR; 3411 } 3412 } 3413 3414 // PrintSharedArchiveAndExit will turn on 3415 // -Xshare:on 3416 // -XX:+TraceClassPaths 3417 if (PrintSharedArchiveAndExit) { 3418 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3419 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3420 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3421 } 3422 3423 // Change the default value for flags which have different default values 3424 // when working with older JDKs. 3425 #ifdef LINUX 3426 if (JDK_Version::current().compare_major(6) <= 0 && 3427 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3428 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3429 } 3430 #endif // LINUX 3431 fix_appclasspath(); 3432 return JNI_OK; 3433 } 3434 3435 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3436 // 3437 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3438 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3439 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3440 // path is treated as the current directory. 3441 // 3442 // This causes problems with CDS, which requires that all directories specified in the classpath 3443 // must be empty. In most cases, applications do NOT want to load classes from the current 3444 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3445 // scripts compatible with CDS. 3446 void Arguments::fix_appclasspath() { 3447 if (IgnoreEmptyClassPaths) { 3448 const char separator = *os::path_separator(); 3449 const char* src = _java_class_path->value(); 3450 3451 // skip over all the leading empty paths 3452 while (*src == separator) { 3453 src ++; 3454 } 3455 3456 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3457 strncpy(copy, src, strlen(src) + 1); 3458 3459 // trim all trailing empty paths 3460 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3461 *tail = '\0'; 3462 } 3463 3464 char from[3] = {separator, separator, '\0'}; 3465 char to [2] = {separator, '\0'}; 3466 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3467 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3468 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3469 } 3470 3471 _java_class_path->set_value(copy); 3472 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3473 } 3474 3475 if (!PrintSharedArchiveAndExit) { 3476 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3477 } 3478 } 3479 3480 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3481 // This must be done after all -D arguments have been processed. 3482 scp_p->expand_endorsed(); 3483 3484 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3485 // Assemble the bootclasspath elements into the final path. 3486 Arguments::set_sysclasspath(scp_p->combined_path()); 3487 } 3488 3489 // This must be done after all arguments have been processed. 3490 // java_compiler() true means set to "NONE" or empty. 3491 if (java_compiler() && !xdebug_mode()) { 3492 // For backwards compatibility, we switch to interpreted mode if 3493 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3494 // not specified. 3495 set_mode_flags(_int); 3496 } 3497 if (CompileThreshold == 0) { 3498 set_mode_flags(_int); 3499 } 3500 3501 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3502 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3503 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3504 } 3505 3506 #ifndef COMPILER2 3507 // Don't degrade server performance for footprint 3508 if (FLAG_IS_DEFAULT(UseLargePages) && 3509 MaxHeapSize < LargePageHeapSizeThreshold) { 3510 // No need for large granularity pages w/small heaps. 3511 // Note that large pages are enabled/disabled for both the 3512 // Java heap and the code cache. 3513 FLAG_SET_DEFAULT(UseLargePages, false); 3514 } 3515 3516 #else 3517 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3518 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3519 } 3520 #endif 3521 3522 #ifndef TIERED 3523 // Tiered compilation is undefined. 3524 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3525 #endif 3526 3527 // If we are running in a headless jre, force java.awt.headless property 3528 // to be true unless the property has already been set. 3529 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3530 if (os::is_headless_jre()) { 3531 const char* headless = Arguments::get_property("java.awt.headless"); 3532 if (headless == NULL) { 3533 char envbuffer[128]; 3534 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3535 if (!add_property("java.awt.headless=true")) { 3536 return JNI_ENOMEM; 3537 } 3538 } else { 3539 char buffer[256]; 3540 strcpy(buffer, "java.awt.headless="); 3541 strcat(buffer, envbuffer); 3542 if (!add_property(buffer)) { 3543 return JNI_ENOMEM; 3544 } 3545 } 3546 } 3547 } 3548 3549 if (!ArgumentsExt::check_vm_args_consistency()) { 3550 return JNI_ERR; 3551 } 3552 3553 return JNI_OK; 3554 } 3555 3556 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3557 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3558 scp_assembly_required_p); 3559 } 3560 3561 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3562 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3563 scp_assembly_required_p); 3564 } 3565 3566 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3567 const int N_MAX_OPTIONS = 64; 3568 const int OPTION_BUFFER_SIZE = 1024; 3569 char buffer[OPTION_BUFFER_SIZE]; 3570 3571 // The variable will be ignored if it exceeds the length of the buffer. 3572 // Don't check this variable if user has special privileges 3573 // (e.g. unix su command). 3574 if (os::getenv(name, buffer, sizeof(buffer)) && 3575 !os::have_special_privileges()) { 3576 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3577 jio_fprintf(defaultStream::error_stream(), 3578 "Picked up %s: %s\n", name, buffer); 3579 char* rd = buffer; // pointer to the input string (rd) 3580 int i; 3581 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3582 while (isspace(*rd)) rd++; // skip whitespace 3583 if (*rd == 0) break; // we re done when the input string is read completely 3584 3585 // The output, option string, overwrites the input string. 3586 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3587 // input string (rd). 3588 char* wrt = rd; 3589 3590 options[i++].optionString = wrt; // Fill in option 3591 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3592 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3593 int quote = *rd; // matching quote to look for 3594 rd++; // don't copy open quote 3595 while (*rd != quote) { // include everything (even spaces) up until quote 3596 if (*rd == 0) { // string termination means unmatched string 3597 jio_fprintf(defaultStream::error_stream(), 3598 "Unmatched quote in %s\n", name); 3599 return JNI_ERR; 3600 } 3601 *wrt++ = *rd++; // copy to option string 3602 } 3603 rd++; // don't copy close quote 3604 } else { 3605 *wrt++ = *rd++; // copy to option string 3606 } 3607 } 3608 // Need to check if we're done before writing a NULL, 3609 // because the write could be to the byte that rd is pointing to. 3610 if (*rd++ == 0) { 3611 *wrt = 0; 3612 break; 3613 } 3614 *wrt = 0; // Zero terminate option 3615 } 3616 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3617 JavaVMInitArgs vm_args; 3618 vm_args.version = JNI_VERSION_1_2; 3619 vm_args.options = options; 3620 vm_args.nOptions = i; 3621 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3622 3623 if (PrintVMOptions) { 3624 const char* tail; 3625 for (int i = 0; i < vm_args.nOptions; i++) { 3626 const JavaVMOption *option = vm_args.options + i; 3627 if (match_option(option, "-XX:", &tail)) { 3628 logOption(tail); 3629 } 3630 } 3631 } 3632 3633 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3634 } 3635 return JNI_OK; 3636 } 3637 3638 void Arguments::set_shared_spaces_flags() { 3639 if (DumpSharedSpaces) { 3640 if (RequireSharedSpaces) { 3641 warning("cannot dump shared archive while using shared archive"); 3642 } 3643 UseSharedSpaces = false; 3644 #ifdef _LP64 3645 if (!UseCompressedOops || !UseCompressedClassPointers) { 3646 vm_exit_during_initialization( 3647 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3648 } 3649 } else { 3650 if (!UseCompressedOops || !UseCompressedClassPointers) { 3651 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3652 } 3653 #endif 3654 } 3655 } 3656 3657 #if !INCLUDE_ALL_GCS 3658 static void force_serial_gc() { 3659 FLAG_SET_DEFAULT(UseSerialGC, true); 3660 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3661 UNSUPPORTED_GC_OPTION(UseG1GC); 3662 UNSUPPORTED_GC_OPTION(UseParallelGC); 3663 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3664 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3665 UNSUPPORTED_GC_OPTION(UseParNewGC); 3666 } 3667 #endif // INCLUDE_ALL_GCS 3668 3669 // Sharing support 3670 // Construct the path to the archive 3671 static char* get_shared_archive_path() { 3672 char *shared_archive_path; 3673 if (SharedArchiveFile == NULL) { 3674 char jvm_path[JVM_MAXPATHLEN]; 3675 os::jvm_path(jvm_path, sizeof(jvm_path)); 3676 char *end = strrchr(jvm_path, *os::file_separator()); 3677 if (end != NULL) *end = '\0'; 3678 size_t jvm_path_len = strlen(jvm_path); 3679 size_t file_sep_len = strlen(os::file_separator()); 3680 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3681 file_sep_len + 20, mtInternal); 3682 if (shared_archive_path != NULL) { 3683 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3684 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3685 strncat(shared_archive_path, "classes.jsa", 11); 3686 } 3687 } else { 3688 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3689 if (shared_archive_path != NULL) { 3690 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3691 } 3692 } 3693 return shared_archive_path; 3694 } 3695 3696 #ifndef PRODUCT 3697 // Determine whether LogVMOutput should be implicitly turned on. 3698 static bool use_vm_log() { 3699 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3700 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3701 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3702 PrintAssembly || TraceDeoptimization || TraceDependencies || 3703 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3704 return true; 3705 } 3706 3707 #ifdef COMPILER1 3708 if (PrintC1Statistics) { 3709 return true; 3710 } 3711 #endif // COMPILER1 3712 3713 #ifdef COMPILER2 3714 if (PrintOptoAssembly || PrintOptoStatistics) { 3715 return true; 3716 } 3717 #endif // COMPILER2 3718 3719 return false; 3720 } 3721 #endif // PRODUCT 3722 3723 // Parse entry point called from JNI_CreateJavaVM 3724 3725 jint Arguments::parse(const JavaVMInitArgs* args) { 3726 3727 // Remaining part of option string 3728 const char* tail; 3729 3730 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3731 const char* hotspotrc = ".hotspotrc"; 3732 bool settings_file_specified = false; 3733 bool needs_hotspotrc_warning = false; 3734 3735 const char* flags_file; 3736 int index; 3737 for (index = 0; index < args->nOptions; index++) { 3738 const JavaVMOption *option = args->options + index; 3739 if (match_option(option, "-XX:Flags=", &tail)) { 3740 flags_file = tail; 3741 settings_file_specified = true; 3742 } 3743 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3744 PrintVMOptions = true; 3745 } 3746 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3747 PrintVMOptions = false; 3748 } 3749 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3750 IgnoreUnrecognizedVMOptions = true; 3751 } 3752 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3753 IgnoreUnrecognizedVMOptions = false; 3754 } 3755 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3756 CommandLineFlags::printFlags(tty, false); 3757 vm_exit(0); 3758 } 3759 #if INCLUDE_NMT 3760 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3761 // The launcher did not setup nmt environment variable properly. 3762 if (!MemTracker::check_launcher_nmt_support(tail)) { 3763 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3764 } 3765 3766 // Verify if nmt option is valid. 3767 if (MemTracker::verify_nmt_option()) { 3768 // Late initialization, still in single-threaded mode. 3769 if (MemTracker::tracking_level() >= NMT_summary) { 3770 MemTracker::init(); 3771 } 3772 } else { 3773 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3774 } 3775 } 3776 #endif 3777 3778 3779 #ifndef PRODUCT 3780 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3781 CommandLineFlags::printFlags(tty, true); 3782 vm_exit(0); 3783 } 3784 #endif 3785 } 3786 3787 if (IgnoreUnrecognizedVMOptions) { 3788 // uncast const to modify the flag args->ignoreUnrecognized 3789 *(jboolean*)(&args->ignoreUnrecognized) = true; 3790 } 3791 3792 // Parse specified settings file 3793 if (settings_file_specified) { 3794 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3795 return JNI_EINVAL; 3796 } 3797 } else { 3798 #ifdef ASSERT 3799 // Parse default .hotspotrc settings file 3800 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3801 return JNI_EINVAL; 3802 } 3803 #else 3804 struct stat buf; 3805 if (os::stat(hotspotrc, &buf) == 0) { 3806 needs_hotspotrc_warning = true; 3807 } 3808 #endif 3809 } 3810 3811 if (PrintVMOptions) { 3812 for (index = 0; index < args->nOptions; index++) { 3813 const JavaVMOption *option = args->options + index; 3814 if (match_option(option, "-XX:", &tail)) { 3815 logOption(tail); 3816 } 3817 } 3818 } 3819 3820 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3821 jint result = parse_vm_init_args(args); 3822 if (result != JNI_OK) { 3823 return result; 3824 } 3825 3826 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3827 SharedArchivePath = get_shared_archive_path(); 3828 if (SharedArchivePath == NULL) { 3829 return JNI_ENOMEM; 3830 } 3831 3832 // Delay warning until here so that we've had a chance to process 3833 // the -XX:-PrintWarnings flag 3834 if (needs_hotspotrc_warning) { 3835 warning("%s file is present but has been ignored. " 3836 "Run with -XX:Flags=%s to load the file.", 3837 hotspotrc, hotspotrc); 3838 } 3839 3840 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3841 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3842 #endif 3843 3844 #if INCLUDE_ALL_GCS 3845 #if (defined JAVASE_EMBEDDED || defined ARM) 3846 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3847 #endif 3848 #endif 3849 3850 #ifndef PRODUCT 3851 if (TraceBytecodesAt != 0) { 3852 TraceBytecodes = true; 3853 } 3854 if (CountCompiledCalls) { 3855 if (UseCounterDecay) { 3856 warning("UseCounterDecay disabled because CountCalls is set"); 3857 UseCounterDecay = false; 3858 } 3859 } 3860 #endif // PRODUCT 3861 3862 if (ScavengeRootsInCode == 0) { 3863 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3864 warning("forcing ScavengeRootsInCode non-zero"); 3865 } 3866 ScavengeRootsInCode = 1; 3867 } 3868 3869 if (PrintGCDetails) { 3870 // Turn on -verbose:gc options as well 3871 PrintGC = true; 3872 } 3873 3874 // Set object alignment values. 3875 set_object_alignment(); 3876 3877 #if !INCLUDE_ALL_GCS 3878 force_serial_gc(); 3879 #endif // INCLUDE_ALL_GCS 3880 #if !INCLUDE_CDS 3881 if (DumpSharedSpaces || RequireSharedSpaces) { 3882 jio_fprintf(defaultStream::error_stream(), 3883 "Shared spaces are not supported in this VM\n"); 3884 return JNI_ERR; 3885 } 3886 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3887 warning("Shared spaces are not supported in this VM"); 3888 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3889 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3890 } 3891 no_shared_spaces("CDS Disabled"); 3892 #endif // INCLUDE_CDS 3893 3894 return JNI_OK; 3895 } 3896 3897 jint Arguments::apply_ergo() { 3898 3899 // Set flags based on ergonomics. 3900 set_ergonomics_flags(); 3901 3902 set_shared_spaces_flags(); 3903 3904 // Check the GC selections again. 3905 if (!ArgumentsExt::check_gc_consistency_ergo()) { 3906 return JNI_EINVAL; 3907 } 3908 3909 if (TieredCompilation) { 3910 set_tiered_flags(); 3911 } else { 3912 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3913 if (CompilationPolicyChoice >= 2) { 3914 vm_exit_during_initialization( 3915 "Incompatible compilation policy selected", NULL); 3916 } 3917 } 3918 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 3919 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3920 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 3921 } 3922 3923 3924 // Set heap size based on available physical memory 3925 set_heap_size(); 3926 3927 set_gc_specific_flags(); 3928 3929 // Initialize Metaspace flags and alignments 3930 Metaspace::ergo_initialize(); 3931 3932 // Set bytecode rewriting flags 3933 set_bytecode_flags(); 3934 3935 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3936 set_aggressive_opts_flags(); 3937 3938 // Turn off biased locking for locking debug mode flags, 3939 // which are subtly different from each other but neither works with 3940 // biased locking 3941 if (UseHeavyMonitors 3942 #ifdef COMPILER1 3943 || !UseFastLocking 3944 #endif // COMPILER1 3945 ) { 3946 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3947 // flag set to true on command line; warn the user that they 3948 // can't enable biased locking here 3949 warning("Biased Locking is not supported with locking debug flags" 3950 "; ignoring UseBiasedLocking flag." ); 3951 } 3952 UseBiasedLocking = false; 3953 } 3954 3955 #ifdef ZERO 3956 // Clear flags not supported on zero. 3957 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3958 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3959 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3960 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3961 #endif // CC_INTERP 3962 3963 #ifdef COMPILER2 3964 if (!EliminateLocks) { 3965 EliminateNestedLocks = false; 3966 } 3967 if (!Inline) { 3968 IncrementalInline = false; 3969 } 3970 #ifndef PRODUCT 3971 if (!IncrementalInline) { 3972 AlwaysIncrementalInline = false; 3973 } 3974 #endif 3975 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3976 // nothing to use the profiling, turn if off 3977 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3978 } 3979 #endif 3980 3981 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3982 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3983 DebugNonSafepoints = true; 3984 } 3985 3986 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3987 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3988 } 3989 3990 #ifndef PRODUCT 3991 if (CompileTheWorld) { 3992 // Force NmethodSweeper to sweep whole CodeCache each time. 3993 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3994 NmethodSweepFraction = 1; 3995 } 3996 } 3997 3998 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3999 if (use_vm_log()) { 4000 LogVMOutput = true; 4001 } 4002 } 4003 #endif // PRODUCT 4004 4005 if (PrintCommandLineFlags) { 4006 CommandLineFlags::printSetFlags(tty); 4007 } 4008 4009 // Apply CPU specific policy for the BiasedLocking 4010 if (UseBiasedLocking) { 4011 if (!VM_Version::use_biased_locking() && 4012 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4013 UseBiasedLocking = false; 4014 } 4015 } 4016 #ifdef COMPILER2 4017 if (!UseBiasedLocking || EmitSync != 0) { 4018 UseOptoBiasInlining = false; 4019 } 4020 #endif 4021 4022 return JNI_OK; 4023 } 4024 4025 jint Arguments::adjust_after_os() { 4026 if (UseNUMA) { 4027 if (UseParallelGC || UseParallelOldGC) { 4028 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4029 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4030 } 4031 } 4032 // UseNUMAInterleaving is set to ON for all collectors and 4033 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4034 // such as the parallel collector for Linux and Solaris will 4035 // interleave old gen and survivor spaces on top of NUMA 4036 // allocation policy for the eden space. 4037 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4038 // all platforms and ParallelGC on Windows will interleave all 4039 // of the heap spaces across NUMA nodes. 4040 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4041 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4042 } 4043 } 4044 return JNI_OK; 4045 } 4046 4047 int Arguments::PropertyList_count(SystemProperty* pl) { 4048 int count = 0; 4049 while(pl != NULL) { 4050 count++; 4051 pl = pl->next(); 4052 } 4053 return count; 4054 } 4055 4056 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4057 assert(key != NULL, "just checking"); 4058 SystemProperty* prop; 4059 for (prop = pl; prop != NULL; prop = prop->next()) { 4060 if (strcmp(key, prop->key()) == 0) return prop->value(); 4061 } 4062 return NULL; 4063 } 4064 4065 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4066 int count = 0; 4067 const char* ret_val = NULL; 4068 4069 while(pl != NULL) { 4070 if(count >= index) { 4071 ret_val = pl->key(); 4072 break; 4073 } 4074 count++; 4075 pl = pl->next(); 4076 } 4077 4078 return ret_val; 4079 } 4080 4081 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4082 int count = 0; 4083 char* ret_val = NULL; 4084 4085 while(pl != NULL) { 4086 if(count >= index) { 4087 ret_val = pl->value(); 4088 break; 4089 } 4090 count++; 4091 pl = pl->next(); 4092 } 4093 4094 return ret_val; 4095 } 4096 4097 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4098 SystemProperty* p = *plist; 4099 if (p == NULL) { 4100 *plist = new_p; 4101 } else { 4102 while (p->next() != NULL) { 4103 p = p->next(); 4104 } 4105 p->set_next(new_p); 4106 } 4107 } 4108 4109 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4110 if (plist == NULL) 4111 return; 4112 4113 SystemProperty* new_p = new SystemProperty(k, v, true); 4114 PropertyList_add(plist, new_p); 4115 } 4116 4117 // This add maintains unique property key in the list. 4118 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4119 if (plist == NULL) 4120 return; 4121 4122 // If property key exist then update with new value. 4123 SystemProperty* prop; 4124 for (prop = *plist; prop != NULL; prop = prop->next()) { 4125 if (strcmp(k, prop->key()) == 0) { 4126 if (append) { 4127 prop->append_value(v); 4128 } else { 4129 prop->set_value(v); 4130 } 4131 return; 4132 } 4133 } 4134 4135 PropertyList_add(plist, k, v); 4136 } 4137 4138 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4139 // Returns true if all of the source pointed by src has been copied over to 4140 // the destination buffer pointed by buf. Otherwise, returns false. 4141 // Notes: 4142 // 1. If the length (buflen) of the destination buffer excluding the 4143 // NULL terminator character is not long enough for holding the expanded 4144 // pid characters, it also returns false instead of returning the partially 4145 // expanded one. 4146 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4147 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4148 char* buf, size_t buflen) { 4149 const char* p = src; 4150 char* b = buf; 4151 const char* src_end = &src[srclen]; 4152 char* buf_end = &buf[buflen - 1]; 4153 4154 while (p < src_end && b < buf_end) { 4155 if (*p == '%') { 4156 switch (*(++p)) { 4157 case '%': // "%%" ==> "%" 4158 *b++ = *p++; 4159 break; 4160 case 'p': { // "%p" ==> current process id 4161 // buf_end points to the character before the last character so 4162 // that we could write '\0' to the end of the buffer. 4163 size_t buf_sz = buf_end - b + 1; 4164 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4165 4166 // if jio_snprintf fails or the buffer is not long enough to hold 4167 // the expanded pid, returns false. 4168 if (ret < 0 || ret >= (int)buf_sz) { 4169 return false; 4170 } else { 4171 b += ret; 4172 assert(*b == '\0', "fail in copy_expand_pid"); 4173 if (p == src_end && b == buf_end + 1) { 4174 // reach the end of the buffer. 4175 return true; 4176 } 4177 } 4178 p++; 4179 break; 4180 } 4181 default : 4182 *b++ = '%'; 4183 } 4184 } else { 4185 *b++ = *p++; 4186 } 4187 } 4188 *b = '\0'; 4189 return (p == src_end); // return false if not all of the source was copied 4190 }