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/globals_extension.hpp" 40 #include "runtime/java.hpp" 41 #include "runtime/os.hpp" 42 #include "runtime/vm_version.hpp" 43 #include "services/management.hpp" 44 #include "services/memTracker.hpp" 45 #include "utilities/defaultStream.hpp" 46 #include "utilities/macros.hpp" 47 #include "utilities/stringUtils.hpp" 48 #include "utilities/taskqueue.hpp" 49 #if INCLUDE_ALL_GCS 50 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 51 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 52 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 53 #endif // INCLUDE_ALL_GCS 54 55 // Note: This is a special bug reporting site for the JVM 56 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 57 #define DEFAULT_JAVA_LAUNCHER "generic" 58 59 // Disable options not supported in this release, with a warning if they 60 // were explicitly requested on the command-line 61 #define UNSUPPORTED_OPTION(opt, description) \ 62 do { \ 63 if (opt) { \ 64 if (FLAG_IS_CMDLINE(opt)) { \ 65 warning(description " is disabled in this release."); \ 66 } \ 67 FLAG_SET_DEFAULT(opt, false); \ 68 } \ 69 } while(0) 70 71 #define UNSUPPORTED_GC_OPTION(gc) \ 72 do { \ 73 if (gc) { \ 74 if (FLAG_IS_CMDLINE(gc)) { \ 75 warning(#gc " is not supported in this VM. Using Serial GC."); \ 76 } \ 77 FLAG_SET_DEFAULT(gc, false); \ 78 } \ 79 } while(0) 80 81 char** Arguments::_jvm_flags_array = NULL; 82 int Arguments::_num_jvm_flags = 0; 83 char** Arguments::_jvm_args_array = NULL; 84 int Arguments::_num_jvm_args = 0; 85 char* Arguments::_java_command = NULL; 86 SystemProperty* Arguments::_system_properties = NULL; 87 const char* Arguments::_gc_log_filename = NULL; 88 bool Arguments::_has_profile = false; 89 size_t Arguments::_conservative_max_heap_alignment = 0; 90 uintx Arguments::_min_heap_size = 0; 91 Arguments::Mode Arguments::_mode = _mixed; 92 bool Arguments::_java_compiler = false; 93 bool Arguments::_xdebug_mode = false; 94 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 95 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 96 int Arguments::_sun_java_launcher_pid = -1; 97 bool Arguments::_sun_java_launcher_is_altjvm = false; 98 99 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 100 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 101 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 102 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 103 bool Arguments::_ClipInlining = ClipInlining; 104 105 char* Arguments::SharedArchivePath = NULL; 106 107 AgentLibraryList Arguments::_libraryList; 108 AgentLibraryList Arguments::_agentList; 109 110 abort_hook_t Arguments::_abort_hook = NULL; 111 exit_hook_t Arguments::_exit_hook = NULL; 112 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 113 114 115 SystemProperty *Arguments::_java_ext_dirs = NULL; 116 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 117 SystemProperty *Arguments::_sun_boot_library_path = NULL; 118 SystemProperty *Arguments::_java_library_path = NULL; 119 SystemProperty *Arguments::_java_home = NULL; 120 SystemProperty *Arguments::_java_class_path = NULL; 121 SystemProperty *Arguments::_sun_boot_class_path = NULL; 122 123 char* Arguments::_meta_index_path = NULL; 124 char* Arguments::_meta_index_dir = NULL; 125 126 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 127 128 static bool match_option(const JavaVMOption *option, const char* name, 129 const char** tail) { 130 int len = (int)strlen(name); 131 if (strncmp(option->optionString, name, len) == 0) { 132 *tail = option->optionString + len; 133 return true; 134 } else { 135 return false; 136 } 137 } 138 139 static void logOption(const char* opt) { 140 if (PrintVMOptions) { 141 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 142 } 143 } 144 145 // Process java launcher properties. 146 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 147 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 148 // sun.java.launcher.pid is defined. 149 // Must do this before setting up other system properties, 150 // as some of them may depend on launcher type. 151 for (int index = 0; index < args->nOptions; index++) { 152 const JavaVMOption* option = args->options + index; 153 const char* tail; 154 155 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 156 process_java_launcher_argument(tail, option->extraInfo); 157 continue; 158 } 159 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 160 if (strcmp(tail, "true") == 0) { 161 _sun_java_launcher_is_altjvm = true; 162 } 163 continue; 164 } 165 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 166 _sun_java_launcher_pid = atoi(tail); 167 continue; 168 } 169 } 170 } 171 172 // Initialize system properties key and value. 173 void Arguments::init_system_properties() { 174 175 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 176 "Java Virtual Machine Specification", false)); 177 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 178 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 179 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 180 181 // Following are JVMTI agent writable properties. 182 // Properties values are set to NULL and they are 183 // os specific they are initialized in os::init_system_properties_values(). 184 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 185 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 186 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 187 _java_library_path = new SystemProperty("java.library.path", NULL, true); 188 _java_home = new SystemProperty("java.home", NULL, true); 189 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 190 191 _java_class_path = new SystemProperty("java.class.path", "", true); 192 193 // Add to System Property list. 194 PropertyList_add(&_system_properties, _java_ext_dirs); 195 PropertyList_add(&_system_properties, _java_endorsed_dirs); 196 PropertyList_add(&_system_properties, _sun_boot_library_path); 197 PropertyList_add(&_system_properties, _java_library_path); 198 PropertyList_add(&_system_properties, _java_home); 199 PropertyList_add(&_system_properties, _java_class_path); 200 PropertyList_add(&_system_properties, _sun_boot_class_path); 201 202 // Set OS specific system properties values 203 os::init_system_properties_values(); 204 } 205 206 207 // Update/Initialize System properties after JDK version number is known 208 void Arguments::init_version_specific_system_properties() { 209 enum { bufsz = 16 }; 210 char buffer[bufsz]; 211 const char* spec_vendor = "Sun Microsystems Inc."; 212 uint32_t spec_version = 0; 213 214 spec_vendor = "Oracle Corporation"; 215 spec_version = JDK_Version::current().major_version(); 216 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 217 218 PropertyList_add(&_system_properties, 219 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 220 PropertyList_add(&_system_properties, 221 new SystemProperty("java.vm.specification.version", buffer, false)); 222 PropertyList_add(&_system_properties, 223 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 224 } 225 226 /** 227 * Provide a slightly more user-friendly way of eliminating -XX flags. 228 * When a flag is eliminated, it can be added to this list in order to 229 * continue accepting this flag on the command-line, while issuing a warning 230 * and ignoring the value. Once the JDK version reaches the 'accept_until' 231 * limit, we flatly refuse to admit the existence of the flag. This allows 232 * a flag to die correctly over JDK releases using HSX. 233 */ 234 typedef struct { 235 const char* name; 236 JDK_Version obsoleted_in; // when the flag went away 237 JDK_Version accept_until; // which version to start denying the existence 238 } ObsoleteFlag; 239 240 static ObsoleteFlag obsolete_jvm_flags[] = { 241 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 242 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 243 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 244 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 245 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 246 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 247 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 248 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 249 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 250 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 251 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 252 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 253 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 254 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 255 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 256 { "DefaultInitialRAMFraction", 257 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 258 { "UseDepthFirstScavengeOrder", 259 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 260 { "HandlePromotionFailure", 261 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 262 { "MaxLiveObjectEvacuationRatio", 263 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 264 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 265 { "UseParallelOldGCCompacting", 266 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 267 { "UseParallelDensePrefixUpdate", 268 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 269 { "UseParallelOldGCDensePrefix", 270 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 271 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 272 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 273 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 274 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 275 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 276 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 277 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 278 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 279 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 280 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 281 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 282 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 283 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 284 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 285 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 286 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 287 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 288 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 289 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 290 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 291 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 292 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 293 #ifdef PRODUCT 294 { "DesiredMethodLimit", 295 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 296 #endif // PRODUCT 297 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 299 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 300 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 301 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 302 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 303 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 304 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 305 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 306 #ifndef ZERO 307 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 308 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 309 #endif // ZERO 310 { NULL, JDK_Version(0), JDK_Version(0) } 311 }; 312 313 // Returns true if the flag is obsolete and fits into the range specified 314 // for being ignored. In the case that the flag is ignored, the 'version' 315 // value is filled in with the version number when the flag became 316 // obsolete so that that value can be displayed to the user. 317 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 318 int i = 0; 319 assert(version != NULL, "Must provide a version buffer"); 320 while (obsolete_jvm_flags[i].name != NULL) { 321 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 322 // <flag>=xxx form 323 // [-|+]<flag> form 324 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 325 ((s[0] == '+' || s[0] == '-') && 326 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 327 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 328 *version = flag_status.obsoleted_in; 329 return true; 330 } 331 } 332 i++; 333 } 334 return false; 335 } 336 337 // Constructs the system class path (aka boot class path) from the following 338 // components, in order: 339 // 340 // prefix // from -Xbootclasspath/p:... 341 // endorsed // the expansion of -Djava.endorsed.dirs=... 342 // base // from os::get_system_properties() or -Xbootclasspath= 343 // suffix // from -Xbootclasspath/a:... 344 // 345 // java.endorsed.dirs is a list of directories; any jar or zip files in the 346 // directories are added to the sysclasspath just before the base. 347 // 348 // This could be AllStatic, but it isn't needed after argument processing is 349 // complete. 350 class SysClassPath: public StackObj { 351 public: 352 SysClassPath(const char* base); 353 ~SysClassPath(); 354 355 inline void set_base(const char* base); 356 inline void add_prefix(const char* prefix); 357 inline void add_suffix_to_prefix(const char* suffix); 358 inline void add_suffix(const char* suffix); 359 inline void reset_path(const char* base); 360 361 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 362 // property. Must be called after all command-line arguments have been 363 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 364 // combined_path(). 365 void expand_endorsed(); 366 367 inline const char* get_base() const { return _items[_scp_base]; } 368 inline const char* get_prefix() const { return _items[_scp_prefix]; } 369 inline const char* get_suffix() const { return _items[_scp_suffix]; } 370 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 371 372 // Combine all the components into a single c-heap-allocated string; caller 373 // must free the string if/when no longer needed. 374 char* combined_path(); 375 376 private: 377 // Utility routines. 378 static char* add_to_path(const char* path, const char* str, bool prepend); 379 static char* add_jars_to_path(char* path, const char* directory); 380 381 inline void reset_item_at(int index); 382 383 // Array indices for the items that make up the sysclasspath. All except the 384 // base are allocated in the C heap and freed by this class. 385 enum { 386 _scp_prefix, // from -Xbootclasspath/p:... 387 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 388 _scp_base, // the default sysclasspath 389 _scp_suffix, // from -Xbootclasspath/a:... 390 _scp_nitems // the number of items, must be last. 391 }; 392 393 const char* _items[_scp_nitems]; 394 DEBUG_ONLY(bool _expansion_done;) 395 }; 396 397 SysClassPath::SysClassPath(const char* base) { 398 memset(_items, 0, sizeof(_items)); 399 _items[_scp_base] = base; 400 DEBUG_ONLY(_expansion_done = false;) 401 } 402 403 SysClassPath::~SysClassPath() { 404 // Free everything except the base. 405 for (int i = 0; i < _scp_nitems; ++i) { 406 if (i != _scp_base) reset_item_at(i); 407 } 408 DEBUG_ONLY(_expansion_done = false;) 409 } 410 411 inline void SysClassPath::set_base(const char* base) { 412 _items[_scp_base] = base; 413 } 414 415 inline void SysClassPath::add_prefix(const char* prefix) { 416 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 417 } 418 419 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 420 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 421 } 422 423 inline void SysClassPath::add_suffix(const char* suffix) { 424 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 425 } 426 427 inline void SysClassPath::reset_item_at(int index) { 428 assert(index < _scp_nitems && index != _scp_base, "just checking"); 429 if (_items[index] != NULL) { 430 FREE_C_HEAP_ARRAY(char, _items[index], mtInternal); 431 _items[index] = NULL; 432 } 433 } 434 435 inline void SysClassPath::reset_path(const char* base) { 436 // Clear the prefix and suffix. 437 reset_item_at(_scp_prefix); 438 reset_item_at(_scp_suffix); 439 set_base(base); 440 } 441 442 //------------------------------------------------------------------------------ 443 444 void SysClassPath::expand_endorsed() { 445 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 446 447 const char* path = Arguments::get_property("java.endorsed.dirs"); 448 if (path == NULL) { 449 path = Arguments::get_endorsed_dir(); 450 assert(path != NULL, "no default for java.endorsed.dirs"); 451 } 452 453 char* expanded_path = NULL; 454 const char separator = *os::path_separator(); 455 const char* const end = path + strlen(path); 456 while (path < end) { 457 const char* tmp_end = strchr(path, separator); 458 if (tmp_end == NULL) { 459 expanded_path = add_jars_to_path(expanded_path, path); 460 path = end; 461 } else { 462 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 463 memcpy(dirpath, path, tmp_end - path); 464 dirpath[tmp_end - path] = '\0'; 465 expanded_path = add_jars_to_path(expanded_path, dirpath); 466 FREE_C_HEAP_ARRAY(char, dirpath, mtInternal); 467 path = tmp_end + 1; 468 } 469 } 470 _items[_scp_endorsed] = expanded_path; 471 DEBUG_ONLY(_expansion_done = true;) 472 } 473 474 // Combine the bootclasspath elements, some of which may be null, into a single 475 // c-heap-allocated string. 476 char* SysClassPath::combined_path() { 477 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 478 assert(_expansion_done, "must call expand_endorsed() first."); 479 480 size_t lengths[_scp_nitems]; 481 size_t total_len = 0; 482 483 const char separator = *os::path_separator(); 484 485 // Get the lengths. 486 int i; 487 for (i = 0; i < _scp_nitems; ++i) { 488 if (_items[i] != NULL) { 489 lengths[i] = strlen(_items[i]); 490 // Include space for the separator char (or a NULL for the last item). 491 total_len += lengths[i] + 1; 492 } 493 } 494 assert(total_len > 0, "empty sysclasspath not allowed"); 495 496 // Copy the _items to a single string. 497 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 498 char* cp_tmp = cp; 499 for (i = 0; i < _scp_nitems; ++i) { 500 if (_items[i] != NULL) { 501 memcpy(cp_tmp, _items[i], lengths[i]); 502 cp_tmp += lengths[i]; 503 *cp_tmp++ = separator; 504 } 505 } 506 *--cp_tmp = '\0'; // Replace the extra separator. 507 return cp; 508 } 509 510 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 511 char* 512 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 513 char *cp; 514 515 assert(str != NULL, "just checking"); 516 if (path == NULL) { 517 size_t len = strlen(str) + 1; 518 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 519 memcpy(cp, str, len); // copy the trailing null 520 } else { 521 const char separator = *os::path_separator(); 522 size_t old_len = strlen(path); 523 size_t str_len = strlen(str); 524 size_t len = old_len + str_len + 2; 525 526 if (prepend) { 527 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 528 char* cp_tmp = cp; 529 memcpy(cp_tmp, str, str_len); 530 cp_tmp += str_len; 531 *cp_tmp = separator; 532 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 533 FREE_C_HEAP_ARRAY(char, path, mtInternal); 534 } else { 535 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 536 char* cp_tmp = cp + old_len; 537 *cp_tmp = separator; 538 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 539 } 540 } 541 return cp; 542 } 543 544 // Scan the directory and append any jar or zip files found to path. 545 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 546 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 547 DIR* dir = os::opendir(directory); 548 if (dir == NULL) return path; 549 550 char dir_sep[2] = { '\0', '\0' }; 551 size_t directory_len = strlen(directory); 552 const char fileSep = *os::file_separator(); 553 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 554 555 /* Scan the directory for jars/zips, appending them to path. */ 556 struct dirent *entry; 557 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 558 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 559 const char* name = entry->d_name; 560 const char* ext = name + strlen(name) - 4; 561 bool isJarOrZip = ext > name && 562 (os::file_name_strcmp(ext, ".jar") == 0 || 563 os::file_name_strcmp(ext, ".zip") == 0); 564 if (isJarOrZip) { 565 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 566 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 567 path = add_to_path(path, jarpath, false); 568 FREE_C_HEAP_ARRAY(char, jarpath, mtInternal); 569 } 570 } 571 FREE_C_HEAP_ARRAY(char, dbuf, mtInternal); 572 os::closedir(dir); 573 return path; 574 } 575 576 // Parses a memory size specification string. 577 static bool atomull(const char *s, julong* result) { 578 julong n = 0; 579 int args_read = 0; 580 bool is_hex = false; 581 // Skip leading 0[xX] for hexadecimal 582 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 583 s += 2; 584 is_hex = true; 585 args_read = sscanf(s, JULONG_FORMAT_X, &n); 586 } else { 587 args_read = sscanf(s, JULONG_FORMAT, &n); 588 } 589 if (args_read != 1) { 590 return false; 591 } 592 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 593 s++; 594 } 595 // 4705540: illegal if more characters are found after the first non-digit 596 if (strlen(s) > 1) { 597 return false; 598 } 599 switch (*s) { 600 case 'T': case 't': 601 *result = n * G * K; 602 // Check for overflow. 603 if (*result/((julong)G * K) != n) return false; 604 return true; 605 case 'G': case 'g': 606 *result = n * G; 607 if (*result/G != n) return false; 608 return true; 609 case 'M': case 'm': 610 *result = n * M; 611 if (*result/M != n) return false; 612 return true; 613 case 'K': case 'k': 614 *result = n * K; 615 if (*result/K != n) return false; 616 return true; 617 case '\0': 618 *result = n; 619 return true; 620 default: 621 return false; 622 } 623 } 624 625 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 626 if (size < min_size) return arg_too_small; 627 // Check that size will fit in a size_t (only relevant on 32-bit) 628 if (size > max_uintx) return arg_too_big; 629 return arg_in_range; 630 } 631 632 // Describe an argument out of range error 633 void Arguments::describe_range_error(ArgsRange errcode) { 634 switch(errcode) { 635 case arg_too_big: 636 jio_fprintf(defaultStream::error_stream(), 637 "The specified size exceeds the maximum " 638 "representable size.\n"); 639 break; 640 case arg_too_small: 641 case arg_unreadable: 642 case arg_in_range: 643 // do nothing for now 644 break; 645 default: 646 ShouldNotReachHere(); 647 } 648 } 649 650 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 651 return CommandLineFlags::boolAtPut(name, &value, origin); 652 } 653 654 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 655 double v; 656 if (sscanf(value, "%lf", &v) != 1) { 657 return false; 658 } 659 660 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 661 return true; 662 } 663 return false; 664 } 665 666 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 667 julong v; 668 intx intx_v; 669 bool is_neg = false; 670 // Check the sign first since atomull() parses only unsigned values. 671 if (*value == '-') { 672 if (!CommandLineFlags::intxAt(name, &intx_v)) { 673 return false; 674 } 675 value++; 676 is_neg = true; 677 } 678 if (!atomull(value, &v)) { 679 return false; 680 } 681 intx_v = (intx) v; 682 if (is_neg) { 683 intx_v = -intx_v; 684 } 685 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 686 return true; 687 } 688 uintx uintx_v = (uintx) v; 689 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 690 return true; 691 } 692 uint64_t uint64_t_v = (uint64_t) v; 693 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 694 return true; 695 } 696 size_t size_t_v = (size_t) v; 697 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 698 return true; 699 } 700 return false; 701 } 702 703 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 704 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 705 // Contract: CommandLineFlags always returns a pointer that needs freeing. 706 FREE_C_HEAP_ARRAY(char, value, mtInternal); 707 return true; 708 } 709 710 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 711 const char* old_value = ""; 712 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 713 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 714 size_t new_len = strlen(new_value); 715 const char* value; 716 char* free_this_too = NULL; 717 if (old_len == 0) { 718 value = new_value; 719 } else if (new_len == 0) { 720 value = old_value; 721 } else { 722 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 723 // each new setting adds another LINE to the switch: 724 sprintf(buf, "%s\n%s", old_value, new_value); 725 value = buf; 726 free_this_too = buf; 727 } 728 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 729 // CommandLineFlags always returns a pointer that needs freeing. 730 FREE_C_HEAP_ARRAY(char, value, mtInternal); 731 if (free_this_too != NULL) { 732 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 733 FREE_C_HEAP_ARRAY(char, free_this_too, mtInternal); 734 } 735 return true; 736 } 737 738 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 739 740 // range of acceptable characters spelled out for portability reasons 741 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 742 #define BUFLEN 255 743 char name[BUFLEN+1]; 744 char dummy; 745 746 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 747 return set_bool_flag(name, false, origin); 748 } 749 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 750 return set_bool_flag(name, true, origin); 751 } 752 753 char punct; 754 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 755 const char* value = strchr(arg, '=') + 1; 756 Flag* flag = Flag::find_flag(name, strlen(name)); 757 if (flag != NULL && flag->is_ccstr()) { 758 if (flag->ccstr_accumulates()) { 759 return append_to_string_flag(name, value, origin); 760 } else { 761 if (value[0] == '\0') { 762 value = NULL; 763 } 764 return set_string_flag(name, value, origin); 765 } 766 } 767 } 768 769 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 770 const char* value = strchr(arg, '=') + 1; 771 // -XX:Foo:=xxx will reset the string flag to the given value. 772 if (value[0] == '\0') { 773 value = NULL; 774 } 775 return set_string_flag(name, value, origin); 776 } 777 778 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 779 #define SIGNED_NUMBER_RANGE "[-0123456789]" 780 #define NUMBER_RANGE "[0123456789]" 781 char value[BUFLEN + 1]; 782 char value2[BUFLEN + 1]; 783 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 784 // Looks like a floating-point number -- try again with more lenient format string 785 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 786 return set_fp_numeric_flag(name, value, origin); 787 } 788 } 789 790 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 791 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 792 return set_numeric_flag(name, value, origin); 793 } 794 795 return false; 796 } 797 798 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 799 assert(bldarray != NULL, "illegal argument"); 800 801 if (arg == NULL) { 802 return; 803 } 804 805 int new_count = *count + 1; 806 807 // expand the array and add arg to the last element 808 if (*bldarray == NULL) { 809 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 810 } else { 811 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 812 } 813 (*bldarray)[*count] = os::strdup_check_oom(arg); 814 *count = new_count; 815 } 816 817 void Arguments::build_jvm_args(const char* arg) { 818 add_string(&_jvm_args_array, &_num_jvm_args, arg); 819 } 820 821 void Arguments::build_jvm_flags(const char* arg) { 822 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 823 } 824 825 // utility function to return a string that concatenates all 826 // strings in a given char** array 827 const char* Arguments::build_resource_string(char** args, int count) { 828 if (args == NULL || count == 0) { 829 return NULL; 830 } 831 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 832 for (int i = 1; i < count; i++) { 833 length += strlen(args[i]) + 1; // add 1 for a space 834 } 835 char* s = NEW_RESOURCE_ARRAY(char, length); 836 strcpy(s, args[0]); 837 for (int j = 1; j < count; j++) { 838 strcat(s, " "); 839 strcat(s, args[j]); 840 } 841 return (const char*) s; 842 } 843 844 void Arguments::print_on(outputStream* st) { 845 st->print_cr("VM Arguments:"); 846 if (num_jvm_flags() > 0) { 847 st->print("jvm_flags: "); print_jvm_flags_on(st); 848 } 849 if (num_jvm_args() > 0) { 850 st->print("jvm_args: "); print_jvm_args_on(st); 851 } 852 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 853 if (_java_class_path != NULL) { 854 char* path = _java_class_path->value(); 855 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 856 } 857 st->print_cr("Launcher Type: %s", _sun_java_launcher); 858 } 859 860 void Arguments::print_jvm_flags_on(outputStream* st) { 861 if (_num_jvm_flags > 0) { 862 for (int i=0; i < _num_jvm_flags; i++) { 863 st->print("%s ", _jvm_flags_array[i]); 864 } 865 st->cr(); 866 } 867 } 868 869 void Arguments::print_jvm_args_on(outputStream* st) { 870 if (_num_jvm_args > 0) { 871 for (int i=0; i < _num_jvm_args; i++) { 872 st->print("%s ", _jvm_args_array[i]); 873 } 874 st->cr(); 875 } 876 } 877 878 bool Arguments::process_argument(const char* arg, 879 jboolean ignore_unrecognized, Flag::Flags origin) { 880 881 JDK_Version since = JDK_Version(); 882 883 if (parse_argument(arg, origin) || ignore_unrecognized) { 884 return true; 885 } 886 887 bool has_plus_minus = (*arg == '+' || *arg == '-'); 888 const char* const argname = has_plus_minus ? arg + 1 : arg; 889 if (is_newly_obsolete(arg, &since)) { 890 char version[256]; 891 since.to_string(version, sizeof(version)); 892 warning("ignoring option %s; support was removed in %s", argname, version); 893 return true; 894 } 895 896 // For locked flags, report a custom error message if available. 897 // Otherwise, report the standard unrecognized VM option. 898 899 size_t arg_len; 900 const char* equal_sign = strchr(argname, '='); 901 if (equal_sign == NULL) { 902 arg_len = strlen(argname); 903 } else { 904 arg_len = equal_sign - argname; 905 } 906 907 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 908 if (found_flag != NULL) { 909 char locked_message_buf[BUFLEN]; 910 found_flag->get_locked_message(locked_message_buf, BUFLEN); 911 if (strlen(locked_message_buf) == 0) { 912 if (found_flag->is_bool() && !has_plus_minus) { 913 jio_fprintf(defaultStream::error_stream(), 914 "Missing +/- setting for VM option '%s'\n", argname); 915 } else if (!found_flag->is_bool() && has_plus_minus) { 916 jio_fprintf(defaultStream::error_stream(), 917 "Unexpected +/- setting in VM option '%s'\n", argname); 918 } else { 919 jio_fprintf(defaultStream::error_stream(), 920 "Improperly specified VM option '%s'\n", argname); 921 } 922 } else { 923 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 924 } 925 } else { 926 jio_fprintf(defaultStream::error_stream(), 927 "Unrecognized VM option '%s'\n", argname); 928 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 929 if (fuzzy_matched != NULL) { 930 jio_fprintf(defaultStream::error_stream(), 931 "Did you mean '%s%s%s'?\n", 932 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 933 fuzzy_matched->_name, 934 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 935 } 936 } 937 938 // allow for commandline "commenting out" options like -XX:#+Verbose 939 return arg[0] == '#'; 940 } 941 942 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 943 FILE* stream = fopen(file_name, "rb"); 944 if (stream == NULL) { 945 if (should_exist) { 946 jio_fprintf(defaultStream::error_stream(), 947 "Could not open settings file %s\n", file_name); 948 return false; 949 } else { 950 return true; 951 } 952 } 953 954 char token[1024]; 955 int pos = 0; 956 957 bool in_white_space = true; 958 bool in_comment = false; 959 bool in_quote = false; 960 char quote_c = 0; 961 bool result = true; 962 963 int c = getc(stream); 964 while(c != EOF && pos < (int)(sizeof(token)-1)) { 965 if (in_white_space) { 966 if (in_comment) { 967 if (c == '\n') in_comment = false; 968 } else { 969 if (c == '#') in_comment = true; 970 else if (!isspace(c)) { 971 in_white_space = false; 972 token[pos++] = c; 973 } 974 } 975 } else { 976 if (c == '\n' || (!in_quote && isspace(c))) { 977 // token ends at newline, or at unquoted whitespace 978 // this allows a way to include spaces in string-valued options 979 token[pos] = '\0'; 980 logOption(token); 981 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 982 build_jvm_flags(token); 983 pos = 0; 984 in_white_space = true; 985 in_quote = false; 986 } else if (!in_quote && (c == '\'' || c == '"')) { 987 in_quote = true; 988 quote_c = c; 989 } else if (in_quote && (c == quote_c)) { 990 in_quote = false; 991 } else { 992 token[pos++] = c; 993 } 994 } 995 c = getc(stream); 996 } 997 if (pos > 0) { 998 token[pos] = '\0'; 999 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1000 build_jvm_flags(token); 1001 } 1002 fclose(stream); 1003 return result; 1004 } 1005 1006 //============================================================================================================= 1007 // Parsing of properties (-D) 1008 1009 const char* Arguments::get_property(const char* key) { 1010 return PropertyList_get_value(system_properties(), key); 1011 } 1012 1013 bool Arguments::add_property(const char* prop) { 1014 const char* eq = strchr(prop, '='); 1015 char* key; 1016 // ns must be static--its address may be stored in a SystemProperty object. 1017 const static char ns[1] = {0}; 1018 char* value = (char *)ns; 1019 1020 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1021 key = AllocateHeap(key_len + 1, mtInternal); 1022 strncpy(key, prop, key_len); 1023 key[key_len] = '\0'; 1024 1025 if (eq != NULL) { 1026 size_t value_len = strlen(prop) - key_len - 1; 1027 value = AllocateHeap(value_len + 1, mtInternal); 1028 strncpy(value, &prop[key_len + 1], value_len + 1); 1029 } 1030 1031 if (strcmp(key, "java.compiler") == 0) { 1032 process_java_compiler_argument(value); 1033 FreeHeap(key); 1034 if (eq != NULL) { 1035 FreeHeap(value); 1036 } 1037 return true; 1038 } else if (strcmp(key, "sun.java.command") == 0) { 1039 _java_command = value; 1040 1041 // Record value in Arguments, but let it get passed to Java. 1042 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1043 strcmp(key, "sun.java.launcher.pid") == 0) { 1044 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1045 // private and are processed in process_sun_java_launcher_properties(); 1046 // the sun.java.launcher property is passed on to the java application 1047 FreeHeap(key); 1048 if (eq != NULL) { 1049 FreeHeap(value); 1050 } 1051 return true; 1052 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1053 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1054 // its value without going through the property list or making a Java call. 1055 _java_vendor_url_bug = value; 1056 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1057 PropertyList_unique_add(&_system_properties, key, value, true); 1058 return true; 1059 } 1060 // Create new property and add at the end of the list 1061 PropertyList_unique_add(&_system_properties, key, value); 1062 return true; 1063 } 1064 1065 //=========================================================================================================== 1066 // Setting int/mixed/comp mode flags 1067 1068 void Arguments::set_mode_flags(Mode mode) { 1069 // Set up default values for all flags. 1070 // If you add a flag to any of the branches below, 1071 // add a default value for it here. 1072 set_java_compiler(false); 1073 _mode = mode; 1074 1075 // Ensure Agent_OnLoad has the correct initial values. 1076 // This may not be the final mode; mode may change later in onload phase. 1077 PropertyList_unique_add(&_system_properties, "java.vm.info", 1078 (char*)VM_Version::vm_info_string(), false); 1079 1080 UseInterpreter = true; 1081 UseCompiler = true; 1082 UseLoopCounter = true; 1083 1084 // Default values may be platform/compiler dependent - 1085 // use the saved values 1086 ClipInlining = Arguments::_ClipInlining; 1087 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1088 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1089 BackgroundCompilation = Arguments::_BackgroundCompilation; 1090 1091 // Change from defaults based on mode 1092 switch (mode) { 1093 default: 1094 ShouldNotReachHere(); 1095 break; 1096 case _int: 1097 UseCompiler = false; 1098 UseLoopCounter = false; 1099 AlwaysCompileLoopMethods = false; 1100 UseOnStackReplacement = false; 1101 break; 1102 case _mixed: 1103 // same as default 1104 break; 1105 case _comp: 1106 UseInterpreter = false; 1107 BackgroundCompilation = false; 1108 ClipInlining = false; 1109 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1110 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1111 // compile a level 4 (C2) and then continue executing it. 1112 if (TieredCompilation) { 1113 Tier3InvokeNotifyFreqLog = 0; 1114 Tier4InvocationThreshold = 0; 1115 } 1116 break; 1117 } 1118 } 1119 1120 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1121 // Conflict: required to use shared spaces (-Xshare:on), but 1122 // incompatible command line options were chosen. 1123 1124 static void no_shared_spaces(const char* message) { 1125 if (RequireSharedSpaces) { 1126 jio_fprintf(defaultStream::error_stream(), 1127 "Class data sharing is inconsistent with other specified options.\n"); 1128 vm_exit_during_initialization("Unable to use shared archive.", message); 1129 } else { 1130 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1131 } 1132 } 1133 #endif 1134 1135 void Arguments::set_tiered_flags() { 1136 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1137 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1138 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1139 } 1140 if (CompilationPolicyChoice < 2) { 1141 vm_exit_during_initialization( 1142 "Incompatible compilation policy selected", NULL); 1143 } 1144 // Increase the code cache size - tiered compiles a lot more. 1145 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1146 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1147 } 1148 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1149 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1150 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1151 1152 // Multiply sizes by 5 but fix NonMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1153 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1154 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonMethodCodeHeapSize * 2); 1155 } 1156 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1157 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonMethodCodeHeapSize * 2); 1158 } 1159 // Check consistency of code heap sizes 1160 if ((NonMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1161 jio_fprintf(defaultStream::error_stream(), 1162 "Invalid code heap sizes: NonMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1163 NonMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1164 (NonMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1165 vm_exit(1); 1166 } 1167 } 1168 if (!UseInterpreter) { // -Xcomp 1169 Tier3InvokeNotifyFreqLog = 0; 1170 Tier4InvocationThreshold = 0; 1171 } 1172 } 1173 1174 /** 1175 * Returns the minimum number of compiler threads needed to run the JVM. The following 1176 * configurations are possible. 1177 * 1178 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1179 * compiler threads is 0. 1180 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1181 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1182 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1183 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1184 * C1 can be used, so the minimum number of compiler threads is 1. 1185 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1186 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1187 * the minimum number of compiler threads is 2. 1188 */ 1189 int Arguments::get_min_number_of_compiler_threads() { 1190 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1191 return 0; // case 1 1192 #else 1193 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1194 return 1; // case 2 or case 3 1195 } 1196 return 2; // case 4 (tiered) 1197 #endif 1198 } 1199 1200 #if INCLUDE_ALL_GCS 1201 static void disable_adaptive_size_policy(const char* collector_name) { 1202 if (UseAdaptiveSizePolicy) { 1203 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1204 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1205 collector_name); 1206 } 1207 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1208 } 1209 } 1210 1211 void Arguments::set_parnew_gc_flags() { 1212 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1213 "control point invariant"); 1214 assert(UseParNewGC, "Error"); 1215 1216 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1217 disable_adaptive_size_policy("UseParNewGC"); 1218 1219 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1220 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1221 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1222 } else if (ParallelGCThreads == 0) { 1223 jio_fprintf(defaultStream::error_stream(), 1224 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1225 vm_exit(1); 1226 } 1227 1228 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1229 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1230 // we set them to 1024 and 1024. 1231 // See CR 6362902. 1232 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1233 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1234 } 1235 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1236 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1237 } 1238 1239 // When using compressed oops, we use local overflow stacks, 1240 // rather than using a global overflow list chained through 1241 // the klass word of the object's pre-image. 1242 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1243 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1244 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1245 } 1246 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1247 } 1248 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1249 } 1250 1251 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1252 // sparc/solaris for certain applications, but would gain from 1253 // further optimization and tuning efforts, and would almost 1254 // certainly gain from analysis of platform and environment. 1255 void Arguments::set_cms_and_parnew_gc_flags() { 1256 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1257 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1258 1259 // If we are using CMS, we prefer to UseParNewGC, 1260 // unless explicitly forbidden. 1261 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1262 FLAG_SET_ERGO(bool, UseParNewGC, true); 1263 } 1264 1265 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1266 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1267 1268 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1269 // as needed. 1270 if (UseParNewGC) { 1271 set_parnew_gc_flags(); 1272 } 1273 1274 size_t max_heap = align_size_down(MaxHeapSize, 1275 CardTableRS::ct_max_alignment_constraint()); 1276 1277 // Now make adjustments for CMS 1278 intx tenuring_default = (intx)6; 1279 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1280 1281 // Preferred young gen size for "short" pauses: 1282 // upper bound depends on # of threads and NewRatio. 1283 const uintx parallel_gc_threads = 1284 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1285 const size_t preferred_max_new_size_unaligned = 1286 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1287 size_t preferred_max_new_size = 1288 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1289 1290 // Unless explicitly requested otherwise, size young gen 1291 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1292 1293 // If either MaxNewSize or NewRatio is set on the command line, 1294 // assume the user is trying to set the size of the young gen. 1295 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1296 1297 // Set MaxNewSize to our calculated preferred_max_new_size unless 1298 // NewSize was set on the command line and it is larger than 1299 // preferred_max_new_size. 1300 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1301 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1302 } else { 1303 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1304 } 1305 if (PrintGCDetails && Verbose) { 1306 // Too early to use gclog_or_tty 1307 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1308 } 1309 1310 // Code along this path potentially sets NewSize and OldSize 1311 if (PrintGCDetails && Verbose) { 1312 // Too early to use gclog_or_tty 1313 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1314 " initial_heap_size: " SIZE_FORMAT 1315 " max_heap: " SIZE_FORMAT, 1316 min_heap_size(), InitialHeapSize, max_heap); 1317 } 1318 size_t min_new = preferred_max_new_size; 1319 if (FLAG_IS_CMDLINE(NewSize)) { 1320 min_new = NewSize; 1321 } 1322 if (max_heap > min_new && min_heap_size() > min_new) { 1323 // Unless explicitly requested otherwise, make young gen 1324 // at least min_new, and at most preferred_max_new_size. 1325 if (FLAG_IS_DEFAULT(NewSize)) { 1326 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1327 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1328 if (PrintGCDetails && Verbose) { 1329 // Too early to use gclog_or_tty 1330 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1331 } 1332 } 1333 // Unless explicitly requested otherwise, size old gen 1334 // so it's NewRatio x of NewSize. 1335 if (FLAG_IS_DEFAULT(OldSize)) { 1336 if (max_heap > NewSize) { 1337 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1338 if (PrintGCDetails && Verbose) { 1339 // Too early to use gclog_or_tty 1340 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1341 } 1342 } 1343 } 1344 } 1345 } 1346 // Unless explicitly requested otherwise, definitely 1347 // promote all objects surviving "tenuring_default" scavenges. 1348 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1349 FLAG_IS_DEFAULT(SurvivorRatio)) { 1350 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1351 } 1352 // If we decided above (or user explicitly requested) 1353 // `promote all' (via MaxTenuringThreshold := 0), 1354 // prefer minuscule survivor spaces so as not to waste 1355 // space for (non-existent) survivors 1356 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1357 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1358 } 1359 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1360 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1361 // This is done in order to make ParNew+CMS configuration to work 1362 // with YoungPLABSize and OldPLABSize options. 1363 // See CR 6362902. 1364 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1365 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1366 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1367 // is. In this situation let CMSParPromoteBlocksToClaim follow 1368 // the value (either from the command line or ergonomics) of 1369 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1370 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1371 } else { 1372 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1373 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1374 // we'll let it to take precedence. 1375 jio_fprintf(defaultStream::error_stream(), 1376 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1377 " options are specified for the CMS collector." 1378 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1379 } 1380 } 1381 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1382 // OldPLAB sizing manually turned off: Use a larger default setting, 1383 // unless it was manually specified. This is because a too-low value 1384 // will slow down scavenges. 1385 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1386 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1387 } 1388 } 1389 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1390 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1391 // If either of the static initialization defaults have changed, note this 1392 // modification. 1393 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1394 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1395 } 1396 if (PrintGCDetails && Verbose) { 1397 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1398 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1399 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1400 } 1401 } 1402 #endif // INCLUDE_ALL_GCS 1403 1404 void set_object_alignment() { 1405 // Object alignment. 1406 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1407 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1408 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1409 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1410 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1411 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1412 1413 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1414 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1415 1416 // Oop encoding heap max 1417 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1418 1419 #if INCLUDE_ALL_GCS 1420 // Set CMS global values 1421 CompactibleFreeListSpace::set_cms_values(); 1422 #endif // INCLUDE_ALL_GCS 1423 } 1424 1425 bool verify_object_alignment() { 1426 // Object alignment. 1427 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1428 jio_fprintf(defaultStream::error_stream(), 1429 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1430 (int)ObjectAlignmentInBytes); 1431 return false; 1432 } 1433 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1434 jio_fprintf(defaultStream::error_stream(), 1435 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1436 (int)ObjectAlignmentInBytes, BytesPerLong); 1437 return false; 1438 } 1439 // It does not make sense to have big object alignment 1440 // since a space lost due to alignment will be greater 1441 // then a saved space from compressed oops. 1442 if ((int)ObjectAlignmentInBytes > 256) { 1443 jio_fprintf(defaultStream::error_stream(), 1444 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1445 (int)ObjectAlignmentInBytes); 1446 return false; 1447 } 1448 // In case page size is very small. 1449 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1450 jio_fprintf(defaultStream::error_stream(), 1451 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1452 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1453 return false; 1454 } 1455 if(SurvivorAlignmentInBytes == 0) { 1456 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1457 } else { 1458 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1459 jio_fprintf(defaultStream::error_stream(), 1460 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1461 (int)SurvivorAlignmentInBytes); 1462 return false; 1463 } 1464 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1465 jio_fprintf(defaultStream::error_stream(), 1466 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1467 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1468 return false; 1469 } 1470 } 1471 return true; 1472 } 1473 1474 size_t Arguments::max_heap_for_compressed_oops() { 1475 // Avoid sign flip. 1476 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1477 // We need to fit both the NULL page and the heap into the memory budget, while 1478 // keeping alignment constraints of the heap. To guarantee the latter, as the 1479 // NULL page is located before the heap, we pad the NULL page to the conservative 1480 // maximum alignment that the GC may ever impose upon the heap. 1481 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1482 _conservative_max_heap_alignment); 1483 1484 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1485 NOT_LP64(ShouldNotReachHere(); return 0); 1486 } 1487 1488 bool Arguments::should_auto_select_low_pause_collector() { 1489 if (UseAutoGCSelectPolicy && 1490 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1491 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1492 if (PrintGCDetails) { 1493 // Cannot use gclog_or_tty yet. 1494 tty->print_cr("Automatic selection of the low pause collector" 1495 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1496 } 1497 return true; 1498 } 1499 return false; 1500 } 1501 1502 void Arguments::set_use_compressed_oops() { 1503 #ifndef ZERO 1504 #ifdef _LP64 1505 // MaxHeapSize is not set up properly at this point, but 1506 // the only value that can override MaxHeapSize if we are 1507 // to use UseCompressedOops is InitialHeapSize. 1508 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1509 1510 if (max_heap_size <= max_heap_for_compressed_oops()) { 1511 #if !defined(COMPILER1) || defined(TIERED) 1512 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1513 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1514 } 1515 #endif 1516 #ifdef _WIN64 1517 if (UseLargePages && UseCompressedOops) { 1518 // Cannot allocate guard pages for implicit checks in indexed addressing 1519 // mode, when large pages are specified on windows. 1520 // This flag could be switched ON if narrow oop base address is set to 0, 1521 // see code in Universe::initialize_heap(). 1522 Universe::set_narrow_oop_use_implicit_null_checks(false); 1523 } 1524 #endif // _WIN64 1525 } else { 1526 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1527 warning("Max heap size too large for Compressed Oops"); 1528 FLAG_SET_DEFAULT(UseCompressedOops, false); 1529 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1530 } 1531 } 1532 #endif // _LP64 1533 #endif // ZERO 1534 } 1535 1536 1537 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1538 // set_use_compressed_oops(). 1539 void Arguments::set_use_compressed_klass_ptrs() { 1540 #ifndef ZERO 1541 #ifdef _LP64 1542 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1543 if (!UseCompressedOops) { 1544 if (UseCompressedClassPointers) { 1545 warning("UseCompressedClassPointers requires UseCompressedOops"); 1546 } 1547 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1548 } else { 1549 // Turn on UseCompressedClassPointers too 1550 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1551 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1552 } 1553 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1554 if (UseCompressedClassPointers) { 1555 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1556 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1557 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1558 } 1559 } 1560 } 1561 #endif // _LP64 1562 #endif // !ZERO 1563 } 1564 1565 void Arguments::set_conservative_max_heap_alignment() { 1566 // The conservative maximum required alignment for the heap is the maximum of 1567 // the alignments imposed by several sources: any requirements from the heap 1568 // itself, the collector policy and the maximum page size we may run the VM 1569 // with. 1570 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1571 #if INCLUDE_ALL_GCS 1572 if (UseParallelGC) { 1573 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1574 } else if (UseG1GC) { 1575 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1576 } 1577 #endif // INCLUDE_ALL_GCS 1578 _conservative_max_heap_alignment = MAX4(heap_alignment, 1579 (size_t)os::vm_allocation_granularity(), 1580 os::max_page_size(), 1581 CollectorPolicy::compute_heap_alignment()); 1582 } 1583 1584 void Arguments::set_ergonomics_flags() { 1585 1586 if (os::is_server_class_machine()) { 1587 // If no other collector is requested explicitly, 1588 // let the VM select the collector based on 1589 // machine class and automatic selection policy. 1590 if (!UseSerialGC && 1591 !UseConcMarkSweepGC && 1592 !UseG1GC && 1593 !UseParNewGC && 1594 FLAG_IS_DEFAULT(UseParallelGC)) { 1595 if (should_auto_select_low_pause_collector()) { 1596 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1597 } else { 1598 FLAG_SET_ERGO(bool, UseParallelGC, true); 1599 } 1600 } 1601 } 1602 #ifdef COMPILER2 1603 // Shared spaces work fine with other GCs but causes bytecode rewriting 1604 // to be disabled, which hurts interpreter performance and decreases 1605 // server performance. When -server is specified, keep the default off 1606 // unless it is asked for. Future work: either add bytecode rewriting 1607 // at link time, or rewrite bytecodes in non-shared methods. 1608 if (!DumpSharedSpaces && !RequireSharedSpaces && 1609 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1610 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1611 } 1612 #endif 1613 1614 set_conservative_max_heap_alignment(); 1615 1616 #ifndef ZERO 1617 #ifdef _LP64 1618 set_use_compressed_oops(); 1619 1620 // set_use_compressed_klass_ptrs() must be called after calling 1621 // set_use_compressed_oops(). 1622 set_use_compressed_klass_ptrs(); 1623 1624 // Also checks that certain machines are slower with compressed oops 1625 // in vm_version initialization code. 1626 #endif // _LP64 1627 #endif // !ZERO 1628 } 1629 1630 void Arguments::set_parallel_gc_flags() { 1631 assert(UseParallelGC || UseParallelOldGC, "Error"); 1632 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1633 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1634 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1635 } 1636 FLAG_SET_DEFAULT(UseParallelGC, true); 1637 1638 // If no heap maximum was requested explicitly, use some reasonable fraction 1639 // of the physical memory, up to a maximum of 1GB. 1640 FLAG_SET_DEFAULT(ParallelGCThreads, 1641 Abstract_VM_Version::parallel_worker_threads()); 1642 if (ParallelGCThreads == 0) { 1643 jio_fprintf(defaultStream::error_stream(), 1644 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1645 vm_exit(1); 1646 } 1647 1648 if (UseAdaptiveSizePolicy) { 1649 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1650 // unless the user actually sets these flags. 1651 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1652 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1653 } 1654 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1655 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1656 } 1657 } 1658 1659 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1660 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1661 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1662 // See CR 6362902 for details. 1663 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1664 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1665 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1666 } 1667 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1668 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1669 } 1670 } 1671 1672 if (UseParallelOldGC) { 1673 // Par compact uses lower default values since they are treated as 1674 // minimums. These are different defaults because of the different 1675 // interpretation and are not ergonomically set. 1676 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1677 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1678 } 1679 } 1680 } 1681 1682 void Arguments::set_g1_gc_flags() { 1683 assert(UseG1GC, "Error"); 1684 #ifdef COMPILER1 1685 FastTLABRefill = false; 1686 #endif 1687 FLAG_SET_DEFAULT(ParallelGCThreads, 1688 Abstract_VM_Version::parallel_worker_threads()); 1689 if (ParallelGCThreads == 0) { 1690 FLAG_SET_DEFAULT(ParallelGCThreads, 1691 Abstract_VM_Version::parallel_worker_threads()); 1692 } 1693 1694 // MarkStackSize will be set (if it hasn't been set by the user) 1695 // when concurrent marking is initialized. 1696 // Its value will be based upon the number of parallel marking threads. 1697 // But we do set the maximum mark stack size here. 1698 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1699 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1700 } 1701 1702 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1703 // In G1, we want the default GC overhead goal to be higher than 1704 // say in PS. So we set it here to 10%. Otherwise the heap might 1705 // be expanded more aggressively than we would like it to. In 1706 // fact, even 10% seems to not be high enough in some cases 1707 // (especially small GC stress tests that the main thing they do 1708 // is allocation). We might consider increase it further. 1709 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1710 } 1711 1712 if (PrintGCDetails && Verbose) { 1713 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1714 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1715 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1716 } 1717 } 1718 1719 julong Arguments::limit_by_allocatable_memory(julong limit) { 1720 julong max_allocatable; 1721 julong result = limit; 1722 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1723 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1724 } 1725 return result; 1726 } 1727 1728 // Use static initialization to get the default before parsing 1729 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1730 1731 void Arguments::set_heap_size() { 1732 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1733 // Deprecated flag 1734 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1735 } 1736 1737 const julong phys_mem = 1738 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1739 : (julong)MaxRAM; 1740 1741 // If the maximum heap size has not been set with -Xmx, 1742 // then set it as fraction of the size of physical memory, 1743 // respecting the maximum and minimum sizes of the heap. 1744 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1745 julong reasonable_max = phys_mem / MaxRAMFraction; 1746 1747 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1748 // Small physical memory, so use a minimum fraction of it for the heap 1749 reasonable_max = phys_mem / MinRAMFraction; 1750 } else { 1751 // Not-small physical memory, so require a heap at least 1752 // as large as MaxHeapSize 1753 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1754 } 1755 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1756 // Limit the heap size to ErgoHeapSizeLimit 1757 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1758 } 1759 if (UseCompressedOops) { 1760 // Limit the heap size to the maximum possible when using compressed oops 1761 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1762 1763 // HeapBaseMinAddress can be greater than default but not less than. 1764 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1765 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1766 // matches compressed oops printing flags 1767 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1768 jio_fprintf(defaultStream::error_stream(), 1769 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1770 " (" UINTX_FORMAT "G) which is greater than value given " 1771 UINTX_FORMAT "\n", 1772 DefaultHeapBaseMinAddress, 1773 DefaultHeapBaseMinAddress/G, 1774 HeapBaseMinAddress); 1775 } 1776 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1777 } 1778 } 1779 1780 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1781 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1782 // but it should be not less than default MaxHeapSize. 1783 max_coop_heap -= HeapBaseMinAddress; 1784 } 1785 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1786 } 1787 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1788 1789 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1790 // An initial heap size was specified on the command line, 1791 // so be sure that the maximum size is consistent. Done 1792 // after call to limit_by_allocatable_memory because that 1793 // method might reduce the allocation size. 1794 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1795 } 1796 1797 if (PrintGCDetails && Verbose) { 1798 // Cannot use gclog_or_tty yet. 1799 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1800 } 1801 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1802 } 1803 1804 // If the minimum or initial heap_size have not been set or requested to be set 1805 // ergonomically, set them accordingly. 1806 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1807 julong reasonable_minimum = (julong)(OldSize + NewSize); 1808 1809 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1810 1811 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1812 1813 if (InitialHeapSize == 0) { 1814 julong reasonable_initial = phys_mem / InitialRAMFraction; 1815 1816 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1817 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1818 1819 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1820 1821 if (PrintGCDetails && Verbose) { 1822 // Cannot use gclog_or_tty yet. 1823 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1824 } 1825 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1826 } 1827 // If the minimum heap size has not been set (via -Xms), 1828 // synchronize with InitialHeapSize to avoid errors with the default value. 1829 if (min_heap_size() == 0) { 1830 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1831 if (PrintGCDetails && Verbose) { 1832 // Cannot use gclog_or_tty yet. 1833 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1834 } 1835 } 1836 } 1837 } 1838 1839 // This must be called after ergonomics because we want bytecode rewriting 1840 // if the server compiler is used, or if UseSharedSpaces is disabled. 1841 void Arguments::set_bytecode_flags() { 1842 // Better not attempt to store into a read-only space. 1843 if (UseSharedSpaces) { 1844 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1845 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1846 } 1847 1848 if (!RewriteBytecodes) { 1849 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1850 } 1851 } 1852 1853 // Aggressive optimization flags -XX:+AggressiveOpts 1854 void Arguments::set_aggressive_opts_flags() { 1855 #ifdef COMPILER2 1856 if (AggressiveUnboxing) { 1857 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1858 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1859 } else if (!EliminateAutoBox) { 1860 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1861 AggressiveUnboxing = false; 1862 } 1863 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1864 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1865 } else if (!DoEscapeAnalysis) { 1866 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1867 AggressiveUnboxing = false; 1868 } 1869 } 1870 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1871 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1872 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1873 } 1874 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1875 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1876 } 1877 1878 // Feed the cache size setting into the JDK 1879 char buffer[1024]; 1880 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1881 add_property(buffer); 1882 } 1883 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1884 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1885 } 1886 #endif 1887 1888 if (AggressiveOpts) { 1889 // Sample flag setting code 1890 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1891 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1892 // } 1893 } 1894 } 1895 1896 //=========================================================================================================== 1897 // Parsing of java.compiler property 1898 1899 void Arguments::process_java_compiler_argument(char* arg) { 1900 // For backwards compatibility, Djava.compiler=NONE or "" 1901 // causes us to switch to -Xint mode UNLESS -Xdebug 1902 // is also specified. 1903 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1904 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1905 } 1906 } 1907 1908 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1909 _sun_java_launcher = os::strdup_check_oom(launcher); 1910 } 1911 1912 bool Arguments::created_by_java_launcher() { 1913 assert(_sun_java_launcher != NULL, "property must have value"); 1914 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1915 } 1916 1917 bool Arguments::sun_java_launcher_is_altjvm() { 1918 return _sun_java_launcher_is_altjvm; 1919 } 1920 1921 //=========================================================================================================== 1922 // Parsing of main arguments 1923 1924 bool Arguments::verify_interval(uintx val, uintx min, 1925 uintx max, const char* name) { 1926 // Returns true iff value is in the inclusive interval [min..max] 1927 // false, otherwise. 1928 if (val >= min && val <= max) { 1929 return true; 1930 } 1931 jio_fprintf(defaultStream::error_stream(), 1932 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1933 " and " UINTX_FORMAT "\n", 1934 name, val, min, max); 1935 return false; 1936 } 1937 1938 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1939 // Returns true if given value is at least specified min threshold 1940 // false, otherwise. 1941 if (val >= min ) { 1942 return true; 1943 } 1944 jio_fprintf(defaultStream::error_stream(), 1945 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1946 name, val, min); 1947 return false; 1948 } 1949 1950 bool Arguments::verify_percentage(uintx value, const char* name) { 1951 if (is_percentage(value)) { 1952 return true; 1953 } 1954 jio_fprintf(defaultStream::error_stream(), 1955 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1956 name, value); 1957 return false; 1958 } 1959 1960 #if !INCLUDE_ALL_GCS 1961 #ifdef ASSERT 1962 static bool verify_serial_gc_flags() { 1963 return (UseSerialGC && 1964 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1965 UseParallelGC || UseParallelOldGC)); 1966 } 1967 #endif // ASSERT 1968 #endif // INCLUDE_ALL_GCS 1969 1970 // check if do gclog rotation 1971 // +UseGCLogFileRotation is a must, 1972 // no gc log rotation when log file not supplied or 1973 // NumberOfGCLogFiles is 0 1974 void check_gclog_consistency() { 1975 if (UseGCLogFileRotation) { 1976 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1977 jio_fprintf(defaultStream::output_stream(), 1978 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1979 "where num_of_file > 0\n" 1980 "GC log rotation is turned off\n"); 1981 UseGCLogFileRotation = false; 1982 } 1983 } 1984 1985 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1986 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1987 jio_fprintf(defaultStream::output_stream(), 1988 "GCLogFileSize changed to minimum 8K\n"); 1989 } 1990 } 1991 1992 // This function is called for -Xloggc:<filename>, it can be used 1993 // to check if a given file name(or string) conforms to the following 1994 // specification: 1995 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1996 // %p and %t only allowed once. We only limit usage of filename not path 1997 bool is_filename_valid(const char *file_name) { 1998 const char* p = file_name; 1999 char file_sep = os::file_separator()[0]; 2000 const char* cp; 2001 // skip prefix path 2002 for (cp = file_name; *cp != '\0'; cp++) { 2003 if (*cp == '/' || *cp == file_sep) { 2004 p = cp + 1; 2005 } 2006 } 2007 2008 int count_p = 0; 2009 int count_t = 0; 2010 while (*p != '\0') { 2011 if ((*p >= '0' && *p <= '9') || 2012 (*p >= 'A' && *p <= 'Z') || 2013 (*p >= 'a' && *p <= 'z') || 2014 *p == '-' || 2015 *p == '_' || 2016 *p == '.') { 2017 p++; 2018 continue; 2019 } 2020 if (*p == '%') { 2021 if(*(p + 1) == 'p') { 2022 p += 2; 2023 count_p ++; 2024 continue; 2025 } 2026 if (*(p + 1) == 't') { 2027 p += 2; 2028 count_t ++; 2029 continue; 2030 } 2031 } 2032 return false; 2033 } 2034 return count_p < 2 && count_t < 2; 2035 } 2036 2037 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2038 if (!is_percentage(min_heap_free_ratio)) { 2039 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2040 return false; 2041 } 2042 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2043 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2044 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2045 MaxHeapFreeRatio); 2046 return false; 2047 } 2048 return true; 2049 } 2050 2051 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2052 if (!is_percentage(max_heap_free_ratio)) { 2053 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2054 return false; 2055 } 2056 if (max_heap_free_ratio < MinHeapFreeRatio) { 2057 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2058 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2059 MinHeapFreeRatio); 2060 return false; 2061 } 2062 return true; 2063 } 2064 2065 // Check consistency of GC selection 2066 bool Arguments::check_gc_consistency() { 2067 check_gclog_consistency(); 2068 bool status = true; 2069 // Ensure that the user has not selected conflicting sets 2070 // of collectors. [Note: this check is merely a user convenience; 2071 // collectors over-ride each other so that only a non-conflicting 2072 // set is selected; however what the user gets is not what they 2073 // may have expected from the combination they asked for. It's 2074 // better to reduce user confusion by not allowing them to 2075 // select conflicting combinations. 2076 uint i = 0; 2077 if (UseSerialGC) i++; 2078 if (UseConcMarkSweepGC || UseParNewGC) i++; 2079 if (UseParallelGC || UseParallelOldGC) i++; 2080 if (UseG1GC) i++; 2081 if (i > 1) { 2082 jio_fprintf(defaultStream::error_stream(), 2083 "Conflicting collector combinations in option list; " 2084 "please refer to the release notes for the combinations " 2085 "allowed\n"); 2086 status = false; 2087 } 2088 return status; 2089 } 2090 2091 void Arguments::check_deprecated_gcs() { 2092 if (UseConcMarkSweepGC && !UseParNewGC) { 2093 warning("Using the DefNew young collector with the CMS collector is deprecated " 2094 "and will likely be removed in a future release"); 2095 } 2096 2097 if (UseParNewGC && !UseConcMarkSweepGC) { 2098 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2099 // set up UseSerialGC properly, so that can't be used in the check here. 2100 warning("Using the ParNew young collector with the Serial old collector is deprecated " 2101 "and will likely be removed in a future release"); 2102 } 2103 2104 if (CMSIncrementalMode) { 2105 warning("Using incremental CMS is deprecated and will likely be removed in a future release"); 2106 } 2107 } 2108 2109 void Arguments::check_deprecated_gc_flags() { 2110 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2111 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2112 "and will likely be removed in future release"); 2113 } 2114 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2115 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2116 "Use MaxRAMFraction instead."); 2117 } 2118 if (FLAG_IS_CMDLINE(UseCMSCompactAtFullCollection)) { 2119 warning("UseCMSCompactAtFullCollection is deprecated and will likely be removed in a future release."); 2120 } 2121 if (FLAG_IS_CMDLINE(CMSFullGCsBeforeCompaction)) { 2122 warning("CMSFullGCsBeforeCompaction is deprecated and will likely be removed in a future release."); 2123 } 2124 if (FLAG_IS_CMDLINE(UseCMSCollectionPassing)) { 2125 warning("UseCMSCollectionPassing is deprecated and will likely be removed in a future release."); 2126 } 2127 } 2128 2129 // Check stack pages settings 2130 bool Arguments::check_stack_pages() 2131 { 2132 bool status = true; 2133 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2134 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2135 // greater stack shadow pages can't generate instruction to bang stack 2136 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2137 return status; 2138 } 2139 2140 // Check the consistency of vm_init_args 2141 bool Arguments::check_vm_args_consistency() { 2142 // Method for adding checks for flag consistency. 2143 // The intent is to warn the user of all possible conflicts, 2144 // before returning an error. 2145 // Note: Needs platform-dependent factoring. 2146 bool status = true; 2147 2148 if (TLABRefillWasteFraction == 0) { 2149 jio_fprintf(defaultStream::error_stream(), 2150 "TLABRefillWasteFraction should be a denominator, " 2151 "not " SIZE_FORMAT "\n", 2152 TLABRefillWasteFraction); 2153 status = false; 2154 } 2155 2156 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2157 "AdaptiveSizePolicyWeight"); 2158 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2159 2160 // Divide by bucket size to prevent a large size from causing rollover when 2161 // calculating amount of memory needed to be allocated for the String table. 2162 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2163 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2164 2165 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2166 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2167 2168 { 2169 // Using "else if" below to avoid printing two error messages if min > max. 2170 // This will also prevent us from reporting both min>100 and max>100 at the 2171 // same time, but that is less annoying than printing two identical errors IMHO. 2172 FormatBuffer<80> err_msg("%s",""); 2173 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2174 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2175 status = false; 2176 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2177 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2178 status = false; 2179 } 2180 } 2181 2182 // Min/MaxMetaspaceFreeRatio 2183 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2184 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2185 2186 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2187 jio_fprintf(defaultStream::error_stream(), 2188 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2189 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2190 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2191 MinMetaspaceFreeRatio, 2192 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2193 MaxMetaspaceFreeRatio); 2194 status = false; 2195 } 2196 2197 // Trying to keep 100% free is not practical 2198 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2199 2200 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2201 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2202 } 2203 2204 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2205 // Settings to encourage splitting. 2206 if (!FLAG_IS_CMDLINE(NewRatio)) { 2207 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2208 } 2209 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2210 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2211 } 2212 } 2213 2214 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2215 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2216 } 2217 2218 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2219 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2220 if (GCTimeLimit == 100) { 2221 // Turn off gc-overhead-limit-exceeded checks 2222 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2223 } 2224 2225 status = status && check_gc_consistency(); 2226 status = status && check_stack_pages(); 2227 2228 if (CMSIncrementalMode) { 2229 if (!UseConcMarkSweepGC) { 2230 jio_fprintf(defaultStream::error_stream(), 2231 "error: invalid argument combination.\n" 2232 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 2233 "selected in order\nto use CMSIncrementalMode.\n"); 2234 status = false; 2235 } else { 2236 status = status && verify_percentage(CMSIncrementalDutyCycle, 2237 "CMSIncrementalDutyCycle"); 2238 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 2239 "CMSIncrementalDutyCycleMin"); 2240 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2241 "CMSIncrementalSafetyFactor"); 2242 status = status && verify_percentage(CMSIncrementalOffset, 2243 "CMSIncrementalOffset"); 2244 status = status && verify_percentage(CMSExpAvgFactor, 2245 "CMSExpAvgFactor"); 2246 // If it was not set on the command line, set 2247 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 2248 if (CMSInitiatingOccupancyFraction < 0) { 2249 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 2250 } 2251 } 2252 } 2253 2254 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2255 // insists that we hold the requisite locks so that the iteration is 2256 // MT-safe. For the verification at start-up and shut-down, we don't 2257 // yet have a good way of acquiring and releasing these locks, 2258 // which are not visible at the CollectedHeap level. We want to 2259 // be able to acquire these locks and then do the iteration rather 2260 // than just disable the lock verification. This will be fixed under 2261 // bug 4788986. 2262 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2263 if (VerifyDuringStartup) { 2264 warning("Heap verification at start-up disabled " 2265 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2266 VerifyDuringStartup = false; // Disable verification at start-up 2267 } 2268 2269 if (VerifyBeforeExit) { 2270 warning("Heap verification at shutdown disabled " 2271 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2272 VerifyBeforeExit = false; // Disable verification at shutdown 2273 } 2274 } 2275 2276 // Note: only executed in non-PRODUCT mode 2277 if (!UseAsyncConcMarkSweepGC && 2278 (ExplicitGCInvokesConcurrent || 2279 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2280 jio_fprintf(defaultStream::error_stream(), 2281 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2282 " with -UseAsyncConcMarkSweepGC"); 2283 status = false; 2284 } 2285 2286 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2287 2288 #if INCLUDE_ALL_GCS 2289 if (UseG1GC) { 2290 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2291 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2292 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2293 2294 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2295 "InitiatingHeapOccupancyPercent"); 2296 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2297 "G1RefProcDrainInterval"); 2298 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2299 "G1ConcMarkStepDurationMillis"); 2300 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2301 "G1ConcRSHotCardLimit"); 2302 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2303 "G1ConcRSLogCacheSize"); 2304 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2305 "StringDeduplicationAgeThreshold"); 2306 } 2307 if (UseConcMarkSweepGC) { 2308 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2309 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2310 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2311 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2312 2313 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2314 2315 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2316 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2317 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2318 2319 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2320 2321 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2322 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2323 2324 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2325 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2326 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2327 2328 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2329 2330 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2331 2332 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2333 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2334 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2335 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2336 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2337 } 2338 2339 if (UseParallelGC || UseParallelOldGC) { 2340 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2341 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2342 2343 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2344 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2345 2346 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2347 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2348 2349 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2350 2351 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2352 } 2353 #endif // INCLUDE_ALL_GCS 2354 2355 status = status && verify_interval(RefDiscoveryPolicy, 2356 ReferenceProcessor::DiscoveryPolicyMin, 2357 ReferenceProcessor::DiscoveryPolicyMax, 2358 "RefDiscoveryPolicy"); 2359 2360 // Limit the lower bound of this flag to 1 as it is used in a division 2361 // expression. 2362 status = status && verify_interval(TLABWasteTargetPercent, 2363 1, 100, "TLABWasteTargetPercent"); 2364 2365 status = status && verify_object_alignment(); 2366 2367 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2368 "CompressedClassSpaceSize"); 2369 2370 status = status && verify_interval(MarkStackSizeMax, 2371 1, (max_jint - 1), "MarkStackSizeMax"); 2372 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2373 2374 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2375 2376 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2377 2378 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2379 2380 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2381 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2382 2383 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2384 2385 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2386 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2387 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2388 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2389 2390 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2391 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2392 2393 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2394 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2395 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2396 2397 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2398 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2399 2400 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2401 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2402 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2403 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2404 2405 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2406 #ifdef COMPILER1 2407 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2408 #endif 2409 2410 if (PrintNMTStatistics) { 2411 #if INCLUDE_NMT 2412 if (MemTracker::tracking_level() == NMT_off) { 2413 #endif // INCLUDE_NMT 2414 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2415 PrintNMTStatistics = false; 2416 #if INCLUDE_NMT 2417 } 2418 #endif 2419 } 2420 2421 // Need to limit the extent of the padding to reasonable size. 2422 // 8K is well beyond the reasonable HW cache line size, even with the 2423 // aggressive prefetching, while still leaving the room for segregating 2424 // among the distinct pages. 2425 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2426 jio_fprintf(defaultStream::error_stream(), 2427 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2428 ContendedPaddingWidth, 0, 8192); 2429 status = false; 2430 } 2431 2432 // Need to enforce the padding not to break the existing field alignments. 2433 // It is sufficient to check against the largest type size. 2434 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2435 jio_fprintf(defaultStream::error_stream(), 2436 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2437 ContendedPaddingWidth, BytesPerLong); 2438 status = false; 2439 } 2440 2441 // Check lower bounds of the code cache 2442 // Template Interpreter code is approximately 3X larger in debug builds. 2443 uint min_code_cache_size = (CodeCacheMinimumUseSpace DEBUG_ONLY(* 3)) + CodeCacheMinimumFreeSpace; 2444 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2445 jio_fprintf(defaultStream::error_stream(), 2446 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2447 os::vm_page_size()/K); 2448 status = false; 2449 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2450 jio_fprintf(defaultStream::error_stream(), 2451 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2452 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2453 status = false; 2454 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2455 jio_fprintf(defaultStream::error_stream(), 2456 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2457 min_code_cache_size/K); 2458 status = false; 2459 } else if (ReservedCodeCacheSize > 2*G) { 2460 // Code cache size larger than MAXINT is not supported. 2461 jio_fprintf(defaultStream::error_stream(), 2462 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2463 (2*G)/M); 2464 status = false; 2465 } else if (NonMethodCodeHeapSize < min_code_cache_size){ 2466 jio_fprintf(defaultStream::error_stream(), 2467 "Invalid NonMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonMethodCodeHeapSize/K, 2468 min_code_cache_size/K); 2469 status = false; 2470 } else if ((!FLAG_IS_DEFAULT(NonMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2471 && (NonMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2472 jio_fprintf(defaultStream::error_stream(), 2473 "Invalid code heap sizes: NonMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2474 NonMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2475 (NonMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2476 status = false; 2477 } 2478 2479 status &= verify_interval(NmethodSweepFraction, 1, ReservedCodeCacheSize/K, "NmethodSweepFraction"); 2480 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2481 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2482 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2483 2484 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2485 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2486 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2487 // Check the minimum number of compiler threads 2488 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2489 2490 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2491 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2492 } 2493 2494 status &= check_vm_args_consistency_ext(); 2495 2496 return status; 2497 } 2498 2499 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2500 const char* option_type) { 2501 if (ignore) return false; 2502 2503 const char* spacer = " "; 2504 if (option_type == NULL) { 2505 option_type = ++spacer; // Set both to the empty string. 2506 } 2507 2508 if (os::obsolete_option(option)) { 2509 jio_fprintf(defaultStream::error_stream(), 2510 "Obsolete %s%soption: %s\n", option_type, spacer, 2511 option->optionString); 2512 return false; 2513 } else { 2514 jio_fprintf(defaultStream::error_stream(), 2515 "Unrecognized %s%soption: %s\n", option_type, spacer, 2516 option->optionString); 2517 return true; 2518 } 2519 } 2520 2521 static const char* user_assertion_options[] = { 2522 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2523 }; 2524 2525 static const char* system_assertion_options[] = { 2526 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2527 }; 2528 2529 // Return true if any of the strings in null-terminated array 'names' matches. 2530 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2531 // the option must match exactly. 2532 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2533 bool tail_allowed) { 2534 for (/* empty */; *names != NULL; ++names) { 2535 if (match_option(option, *names, tail)) { 2536 if (**tail == '\0' || tail_allowed && **tail == ':') { 2537 return true; 2538 } 2539 } 2540 } 2541 return false; 2542 } 2543 2544 bool Arguments::parse_uintx(const char* value, 2545 uintx* uintx_arg, 2546 uintx min_size) { 2547 2548 // Check the sign first since atomull() parses only unsigned values. 2549 bool value_is_positive = !(*value == '-'); 2550 2551 if (value_is_positive) { 2552 julong n; 2553 bool good_return = atomull(value, &n); 2554 if (good_return) { 2555 bool above_minimum = n >= min_size; 2556 bool value_is_too_large = n > max_uintx; 2557 2558 if (above_minimum && !value_is_too_large) { 2559 *uintx_arg = n; 2560 return true; 2561 } 2562 } 2563 } 2564 return false; 2565 } 2566 2567 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2568 julong* long_arg, 2569 julong min_size) { 2570 if (!atomull(s, long_arg)) return arg_unreadable; 2571 return check_memory_size(*long_arg, min_size); 2572 } 2573 2574 // Parse JavaVMInitArgs structure 2575 2576 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2577 // For components of the system classpath. 2578 SysClassPath scp(Arguments::get_sysclasspath()); 2579 bool scp_assembly_required = false; 2580 2581 // Save default settings for some mode flags 2582 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2583 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2584 Arguments::_ClipInlining = ClipInlining; 2585 Arguments::_BackgroundCompilation = BackgroundCompilation; 2586 2587 // Setup flags for mixed which is the default 2588 set_mode_flags(_mixed); 2589 2590 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2591 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2592 if (result != JNI_OK) { 2593 return result; 2594 } 2595 2596 // Parse JavaVMInitArgs structure passed in 2597 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2598 if (result != JNI_OK) { 2599 return result; 2600 } 2601 2602 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2603 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2604 if (result != JNI_OK) { 2605 return result; 2606 } 2607 2608 // Do final processing now that all arguments have been parsed 2609 result = finalize_vm_init_args(&scp, scp_assembly_required); 2610 if (result != JNI_OK) { 2611 return result; 2612 } 2613 2614 return JNI_OK; 2615 } 2616 2617 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2618 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2619 // are dealing with -agentpath (case where name is a path), otherwise with 2620 // -agentlib 2621 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2622 char *_name; 2623 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2624 size_t _len_hprof, _len_jdwp, _len_prefix; 2625 2626 if (is_path) { 2627 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2628 return false; 2629 } 2630 2631 _name++; // skip past last path separator 2632 _len_prefix = strlen(JNI_LIB_PREFIX); 2633 2634 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2635 return false; 2636 } 2637 2638 _name += _len_prefix; 2639 _len_hprof = strlen(_hprof); 2640 _len_jdwp = strlen(_jdwp); 2641 2642 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2643 _name += _len_hprof; 2644 } 2645 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2646 _name += _len_jdwp; 2647 } 2648 else { 2649 return false; 2650 } 2651 2652 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2653 return false; 2654 } 2655 2656 return true; 2657 } 2658 2659 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2660 return true; 2661 } 2662 2663 return false; 2664 } 2665 2666 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2667 SysClassPath* scp_p, 2668 bool* scp_assembly_required_p, 2669 Flag::Flags origin) { 2670 // Remaining part of option string 2671 const char* tail; 2672 2673 // iterate over arguments 2674 for (int index = 0; index < args->nOptions; index++) { 2675 bool is_absolute_path = false; // for -agentpath vs -agentlib 2676 2677 const JavaVMOption* option = args->options + index; 2678 2679 if (!match_option(option, "-Djava.class.path", &tail) && 2680 !match_option(option, "-Dsun.java.command", &tail) && 2681 !match_option(option, "-Dsun.java.launcher", &tail)) { 2682 2683 // add all jvm options to the jvm_args string. This string 2684 // is used later to set the java.vm.args PerfData string constant. 2685 // the -Djava.class.path and the -Dsun.java.command options are 2686 // omitted from jvm_args string as each have their own PerfData 2687 // string constant object. 2688 build_jvm_args(option->optionString); 2689 } 2690 2691 // -verbose:[class/gc/jni] 2692 if (match_option(option, "-verbose", &tail)) { 2693 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2694 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2695 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2696 } else if (!strcmp(tail, ":gc")) { 2697 FLAG_SET_CMDLINE(bool, PrintGC, true); 2698 } else if (!strcmp(tail, ":jni")) { 2699 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2700 } 2701 // -da / -ea / -disableassertions / -enableassertions 2702 // These accept an optional class/package name separated by a colon, e.g., 2703 // -da:java.lang.Thread. 2704 } else if (match_option(option, user_assertion_options, &tail, true)) { 2705 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2706 if (*tail == '\0') { 2707 JavaAssertions::setUserClassDefault(enable); 2708 } else { 2709 assert(*tail == ':', "bogus match by match_option()"); 2710 JavaAssertions::addOption(tail + 1, enable); 2711 } 2712 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2713 } else if (match_option(option, system_assertion_options, &tail, false)) { 2714 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2715 JavaAssertions::setSystemClassDefault(enable); 2716 // -bootclasspath: 2717 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2718 scp_p->reset_path(tail); 2719 *scp_assembly_required_p = true; 2720 // -bootclasspath/a: 2721 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2722 scp_p->add_suffix(tail); 2723 *scp_assembly_required_p = true; 2724 // -bootclasspath/p: 2725 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2726 scp_p->add_prefix(tail); 2727 *scp_assembly_required_p = true; 2728 // -Xrun 2729 } else if (match_option(option, "-Xrun", &tail)) { 2730 if (tail != NULL) { 2731 const char* pos = strchr(tail, ':'); 2732 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2733 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2734 name[len] = '\0'; 2735 2736 char *options = NULL; 2737 if(pos != NULL) { 2738 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2739 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2740 } 2741 #if !INCLUDE_JVMTI 2742 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2743 jio_fprintf(defaultStream::error_stream(), 2744 "Profiling and debugging agents are not supported in this VM\n"); 2745 return JNI_ERR; 2746 } 2747 #endif // !INCLUDE_JVMTI 2748 add_init_library(name, options); 2749 } 2750 // -agentlib and -agentpath 2751 } else if (match_option(option, "-agentlib:", &tail) || 2752 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2753 if(tail != NULL) { 2754 const char* pos = strchr(tail, '='); 2755 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2756 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2757 name[len] = '\0'; 2758 2759 char *options = NULL; 2760 if(pos != NULL) { 2761 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2762 } 2763 #if !INCLUDE_JVMTI 2764 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2765 jio_fprintf(defaultStream::error_stream(), 2766 "Profiling and debugging agents are not supported in this VM\n"); 2767 return JNI_ERR; 2768 } 2769 #endif // !INCLUDE_JVMTI 2770 add_init_agent(name, options, is_absolute_path); 2771 } 2772 // -javaagent 2773 } else if (match_option(option, "-javaagent:", &tail)) { 2774 #if !INCLUDE_JVMTI 2775 jio_fprintf(defaultStream::error_stream(), 2776 "Instrumentation agents are not supported in this VM\n"); 2777 return JNI_ERR; 2778 #else 2779 if(tail != NULL) { 2780 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2781 add_init_agent("instrument", options, false); 2782 } 2783 #endif // !INCLUDE_JVMTI 2784 // -Xnoclassgc 2785 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2786 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2787 // -Xincgc: i-CMS 2788 } else if (match_option(option, "-Xincgc", &tail)) { 2789 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2790 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2791 // -Xnoincgc: no i-CMS 2792 } else if (match_option(option, "-Xnoincgc", &tail)) { 2793 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2794 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2795 // -Xconcgc 2796 } else if (match_option(option, "-Xconcgc", &tail)) { 2797 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2798 // -Xnoconcgc 2799 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2800 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2801 // -Xbatch 2802 } else if (match_option(option, "-Xbatch", &tail)) { 2803 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2804 // -Xmn for compatibility with other JVM vendors 2805 } else if (match_option(option, "-Xmn", &tail)) { 2806 julong long_initial_young_size = 0; 2807 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2808 if (errcode != arg_in_range) { 2809 jio_fprintf(defaultStream::error_stream(), 2810 "Invalid initial young generation size: %s\n", option->optionString); 2811 describe_range_error(errcode); 2812 return JNI_EINVAL; 2813 } 2814 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2815 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2816 // -Xms 2817 } else if (match_option(option, "-Xms", &tail)) { 2818 julong long_initial_heap_size = 0; 2819 // an initial heap size of 0 means automatically determine 2820 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2821 if (errcode != arg_in_range) { 2822 jio_fprintf(defaultStream::error_stream(), 2823 "Invalid initial heap size: %s\n", option->optionString); 2824 describe_range_error(errcode); 2825 return JNI_EINVAL; 2826 } 2827 set_min_heap_size((uintx)long_initial_heap_size); 2828 // Currently the minimum size and the initial heap sizes are the same. 2829 // Can be overridden with -XX:InitialHeapSize. 2830 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2831 // -Xmx 2832 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2833 julong long_max_heap_size = 0; 2834 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2835 if (errcode != arg_in_range) { 2836 jio_fprintf(defaultStream::error_stream(), 2837 "Invalid maximum heap size: %s\n", option->optionString); 2838 describe_range_error(errcode); 2839 return JNI_EINVAL; 2840 } 2841 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2842 // Xmaxf 2843 } else if (match_option(option, "-Xmaxf", &tail)) { 2844 char* err; 2845 int maxf = (int)(strtod(tail, &err) * 100); 2846 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2847 jio_fprintf(defaultStream::error_stream(), 2848 "Bad max heap free percentage size: %s\n", 2849 option->optionString); 2850 return JNI_EINVAL; 2851 } else { 2852 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2853 } 2854 // Xminf 2855 } else if (match_option(option, "-Xminf", &tail)) { 2856 char* err; 2857 int minf = (int)(strtod(tail, &err) * 100); 2858 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2859 jio_fprintf(defaultStream::error_stream(), 2860 "Bad min heap free percentage size: %s\n", 2861 option->optionString); 2862 return JNI_EINVAL; 2863 } else { 2864 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2865 } 2866 // -Xss 2867 } else if (match_option(option, "-Xss", &tail)) { 2868 julong long_ThreadStackSize = 0; 2869 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2870 if (errcode != arg_in_range) { 2871 jio_fprintf(defaultStream::error_stream(), 2872 "Invalid thread stack size: %s\n", option->optionString); 2873 describe_range_error(errcode); 2874 return JNI_EINVAL; 2875 } 2876 // Internally track ThreadStackSize in units of 1024 bytes. 2877 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2878 round_to((int)long_ThreadStackSize, K) / K); 2879 // -Xoss 2880 } else if (match_option(option, "-Xoss", &tail)) { 2881 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2882 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2883 julong long_CodeCacheExpansionSize = 0; 2884 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2885 if (errcode != arg_in_range) { 2886 jio_fprintf(defaultStream::error_stream(), 2887 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2888 os::vm_page_size()/K); 2889 return JNI_EINVAL; 2890 } 2891 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2892 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2893 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2894 julong long_ReservedCodeCacheSize = 0; 2895 2896 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2897 if (errcode != arg_in_range) { 2898 jio_fprintf(defaultStream::error_stream(), 2899 "Invalid maximum code cache size: %s.\n", option->optionString); 2900 return JNI_EINVAL; 2901 } 2902 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2903 // -XX:NonMethodCodeHeapSize= 2904 } else if (match_option(option, "-XX:NonMethodCodeHeapSize=", &tail)) { 2905 julong long_NonMethodCodeHeapSize = 0; 2906 2907 ArgsRange errcode = parse_memory_size(tail, &long_NonMethodCodeHeapSize, 1); 2908 if (errcode != arg_in_range) { 2909 jio_fprintf(defaultStream::error_stream(), 2910 "Invalid maximum non-method code heap size: %s.\n", option->optionString); 2911 return JNI_EINVAL; 2912 } 2913 FLAG_SET_CMDLINE(uintx, NonMethodCodeHeapSize, (uintx)long_NonMethodCodeHeapSize); 2914 // -XX:ProfiledCodeHeapSize= 2915 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2916 julong long_ProfiledCodeHeapSize = 0; 2917 2918 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2919 if (errcode != arg_in_range) { 2920 jio_fprintf(defaultStream::error_stream(), 2921 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2922 return JNI_EINVAL; 2923 } 2924 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2925 // -XX:NonProfiledCodeHeapSizee= 2926 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2927 julong long_NonProfiledCodeHeapSize = 0; 2928 2929 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2930 if (errcode != arg_in_range) { 2931 jio_fprintf(defaultStream::error_stream(), 2932 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2933 return JNI_EINVAL; 2934 } 2935 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2936 //-XX:IncreaseFirstTierCompileThresholdAt= 2937 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2938 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2939 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2940 jio_fprintf(defaultStream::error_stream(), 2941 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2942 option->optionString); 2943 return JNI_EINVAL; 2944 } 2945 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2946 // -green 2947 } else if (match_option(option, "-green", &tail)) { 2948 jio_fprintf(defaultStream::error_stream(), 2949 "Green threads support not available\n"); 2950 return JNI_EINVAL; 2951 // -native 2952 } else if (match_option(option, "-native", &tail)) { 2953 // HotSpot always uses native threads, ignore silently for compatibility 2954 // -Xsqnopause 2955 } else if (match_option(option, "-Xsqnopause", &tail)) { 2956 // EVM option, ignore silently for compatibility 2957 // -Xrs 2958 } else if (match_option(option, "-Xrs", &tail)) { 2959 // Classic/EVM option, new functionality 2960 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2961 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2962 // change default internal VM signals used - lower case for back compat 2963 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2964 // -Xoptimize 2965 } else if (match_option(option, "-Xoptimize", &tail)) { 2966 // EVM option, ignore silently for compatibility 2967 // -Xprof 2968 } else if (match_option(option, "-Xprof", &tail)) { 2969 #if INCLUDE_FPROF 2970 _has_profile = true; 2971 #else // INCLUDE_FPROF 2972 jio_fprintf(defaultStream::error_stream(), 2973 "Flat profiling is not supported in this VM.\n"); 2974 return JNI_ERR; 2975 #endif // INCLUDE_FPROF 2976 // -Xconcurrentio 2977 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2978 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2979 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2980 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2981 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2982 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2983 2984 // -Xinternalversion 2985 } else if (match_option(option, "-Xinternalversion", &tail)) { 2986 jio_fprintf(defaultStream::output_stream(), "%s\n", 2987 VM_Version::internal_vm_info_string()); 2988 vm_exit(0); 2989 #ifndef PRODUCT 2990 // -Xprintflags 2991 } else if (match_option(option, "-Xprintflags", &tail)) { 2992 CommandLineFlags::printFlags(tty, false); 2993 vm_exit(0); 2994 #endif 2995 // -D 2996 } else if (match_option(option, "-D", &tail)) { 2997 if (!add_property(tail)) { 2998 return JNI_ENOMEM; 2999 } 3000 // Out of the box management support 3001 if (match_option(option, "-Dcom.sun.management", &tail)) { 3002 #if INCLUDE_MANAGEMENT 3003 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3004 #else 3005 jio_fprintf(defaultStream::output_stream(), 3006 "-Dcom.sun.management is not supported in this VM.\n"); 3007 return JNI_ERR; 3008 #endif 3009 } 3010 // -Xint 3011 } else if (match_option(option, "-Xint", &tail)) { 3012 set_mode_flags(_int); 3013 // -Xmixed 3014 } else if (match_option(option, "-Xmixed", &tail)) { 3015 set_mode_flags(_mixed); 3016 // -Xcomp 3017 } else if (match_option(option, "-Xcomp", &tail)) { 3018 // for testing the compiler; turn off all flags that inhibit compilation 3019 set_mode_flags(_comp); 3020 // -Xshare:dump 3021 } else if (match_option(option, "-Xshare:dump", &tail)) { 3022 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3023 set_mode_flags(_int); // Prevent compilation, which creates objects 3024 // -Xshare:on 3025 } else if (match_option(option, "-Xshare:on", &tail)) { 3026 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3027 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3028 // -Xshare:auto 3029 } else if (match_option(option, "-Xshare:auto", &tail)) { 3030 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3031 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3032 // -Xshare:off 3033 } else if (match_option(option, "-Xshare:off", &tail)) { 3034 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3035 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3036 // -Xverify 3037 } else if (match_option(option, "-Xverify", &tail)) { 3038 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3039 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3040 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3041 } else if (strcmp(tail, ":remote") == 0) { 3042 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3043 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3044 } else if (strcmp(tail, ":none") == 0) { 3045 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3046 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3047 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3048 return JNI_EINVAL; 3049 } 3050 // -Xdebug 3051 } else if (match_option(option, "-Xdebug", &tail)) { 3052 // note this flag has been used, then ignore 3053 set_xdebug_mode(true); 3054 // -Xnoagent 3055 } else if (match_option(option, "-Xnoagent", &tail)) { 3056 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3057 } else if (match_option(option, "-Xboundthreads", &tail)) { 3058 // Bind user level threads to kernel threads (Solaris only) 3059 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3060 } else if (match_option(option, "-Xloggc:", &tail)) { 3061 // Redirect GC output to the file. -Xloggc:<filename> 3062 // ostream_init_log(), when called will use this filename 3063 // to initialize a fileStream. 3064 _gc_log_filename = os::strdup_check_oom(tail); 3065 if (!is_filename_valid(_gc_log_filename)) { 3066 jio_fprintf(defaultStream::output_stream(), 3067 "Invalid file name for use with -Xloggc: Filename can only contain the " 3068 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3069 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3070 return JNI_EINVAL; 3071 } 3072 FLAG_SET_CMDLINE(bool, PrintGC, true); 3073 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3074 3075 // JNI hooks 3076 } else if (match_option(option, "-Xcheck", &tail)) { 3077 if (!strcmp(tail, ":jni")) { 3078 #if !INCLUDE_JNI_CHECK 3079 warning("JNI CHECKING is not supported in this VM"); 3080 #else 3081 CheckJNICalls = true; 3082 #endif // INCLUDE_JNI_CHECK 3083 } else if (is_bad_option(option, args->ignoreUnrecognized, 3084 "check")) { 3085 return JNI_EINVAL; 3086 } 3087 } else if (match_option(option, "vfprintf", &tail)) { 3088 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3089 } else if (match_option(option, "exit", &tail)) { 3090 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3091 } else if (match_option(option, "abort", &tail)) { 3092 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3093 // -XX:+AggressiveHeap 3094 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 3095 3096 // This option inspects the machine and attempts to set various 3097 // parameters to be optimal for long-running, memory allocation 3098 // intensive jobs. It is intended for machines with large 3099 // amounts of cpu and memory. 3100 3101 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3102 // VM, but we may not be able to represent the total physical memory 3103 // available (like having 8gb of memory on a box but using a 32bit VM). 3104 // Thus, we need to make sure we're using a julong for intermediate 3105 // calculations. 3106 julong initHeapSize; 3107 julong total_memory = os::physical_memory(); 3108 3109 if (total_memory < (julong)256*M) { 3110 jio_fprintf(defaultStream::error_stream(), 3111 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3112 vm_exit(1); 3113 } 3114 3115 // The heap size is half of available memory, or (at most) 3116 // all of possible memory less 160mb (leaving room for the OS 3117 // when using ISM). This is the maximum; because adaptive sizing 3118 // is turned on below, the actual space used may be smaller. 3119 3120 initHeapSize = MIN2(total_memory / (julong)2, 3121 total_memory - (julong)160*M); 3122 3123 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3124 3125 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3126 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3127 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3128 // Currently the minimum size and the initial heap sizes are the same. 3129 set_min_heap_size(initHeapSize); 3130 } 3131 if (FLAG_IS_DEFAULT(NewSize)) { 3132 // Make the young generation 3/8ths of the total heap. 3133 FLAG_SET_CMDLINE(uintx, NewSize, 3134 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3135 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3136 } 3137 3138 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3139 FLAG_SET_DEFAULT(UseLargePages, true); 3140 #endif 3141 3142 // Increase some data structure sizes for efficiency 3143 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3144 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3145 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3146 3147 // See the OldPLABSize comment below, but replace 'after promotion' 3148 // with 'after copying'. YoungPLABSize is the size of the survivor 3149 // space per-gc-thread buffers. The default is 4kw. 3150 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3151 3152 // OldPLABSize is the size of the buffers in the old gen that 3153 // UseParallelGC uses to promote live data that doesn't fit in the 3154 // survivor spaces. At any given time, there's one for each gc thread. 3155 // The default size is 1kw. These buffers are rarely used, since the 3156 // survivor spaces are usually big enough. For specjbb, however, there 3157 // are occasions when there's lots of live data in the young gen 3158 // and we end up promoting some of it. We don't have a definite 3159 // explanation for why bumping OldPLABSize helps, but the theory 3160 // is that a bigger PLAB results in retaining something like the 3161 // original allocation order after promotion, which improves mutator 3162 // locality. A minor effect may be that larger PLABs reduce the 3163 // number of PLAB allocation events during gc. The value of 8kw 3164 // was arrived at by experimenting with specjbb. 3165 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3166 3167 // Enable parallel GC and adaptive generation sizing 3168 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3169 FLAG_SET_DEFAULT(ParallelGCThreads, 3170 Abstract_VM_Version::parallel_worker_threads()); 3171 3172 // Encourage steady state memory management 3173 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3174 3175 // This appears to improve mutator locality 3176 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3177 3178 // Get around early Solaris scheduling bug 3179 // (affinity vs other jobs on system) 3180 // but disallow DR and offlining (5008695). 3181 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3182 3183 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3184 // and the last option wins. 3185 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 3186 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3187 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3188 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3189 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 3190 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3191 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3192 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3193 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3194 uintx max_tenuring_thresh = 0; 3195 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3196 jio_fprintf(defaultStream::error_stream(), 3197 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3198 } 3199 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3200 3201 if (MaxTenuringThreshold == 0) { 3202 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3203 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3204 } else { 3205 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3206 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3207 } 3208 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 3209 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 3210 jio_fprintf(defaultStream::error_stream(), 3211 "Please use CMSClassUnloadingEnabled in place of " 3212 "CMSPermGenSweepingEnabled in the future\n"); 3213 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 3214 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3215 jio_fprintf(defaultStream::error_stream(), 3216 "Please use -XX:+UseGCOverheadLimit in place of " 3217 "-XX:+UseGCTimeLimit in the future\n"); 3218 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 3219 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3220 jio_fprintf(defaultStream::error_stream(), 3221 "Please use -XX:-UseGCOverheadLimit in place of " 3222 "-XX:-UseGCTimeLimit in the future\n"); 3223 // The TLE options are for compatibility with 1.3 and will be 3224 // removed without notice in a future release. These options 3225 // are not to be documented. 3226 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3227 // No longer used. 3228 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 3229 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3230 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 3231 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3232 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 3233 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3234 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 3235 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3236 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3237 // No longer used. 3238 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3239 julong long_tlab_size = 0; 3240 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3241 if (errcode != arg_in_range) { 3242 jio_fprintf(defaultStream::error_stream(), 3243 "Invalid TLAB size: %s\n", option->optionString); 3244 describe_range_error(errcode); 3245 return JNI_EINVAL; 3246 } 3247 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3248 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3249 // No longer used. 3250 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 3251 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3252 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 3253 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3254 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 3255 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3256 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3257 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 3258 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3259 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3260 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 3261 #if defined(DTRACE_ENABLED) 3262 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3263 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3264 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3265 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3266 #else // defined(DTRACE_ENABLED) 3267 jio_fprintf(defaultStream::error_stream(), 3268 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3269 return JNI_EINVAL; 3270 #endif // defined(DTRACE_ENABLED) 3271 #ifdef ASSERT 3272 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 3273 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3274 // disable scavenge before parallel mark-compact 3275 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3276 #endif 3277 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3278 julong cms_blocks_to_claim = (julong)atol(tail); 3279 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3280 jio_fprintf(defaultStream::error_stream(), 3281 "Please use -XX:OldPLABSize in place of " 3282 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3283 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3284 julong cms_blocks_to_claim = (julong)atol(tail); 3285 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3286 jio_fprintf(defaultStream::error_stream(), 3287 "Please use -XX:OldPLABSize in place of " 3288 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3289 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3290 julong old_plab_size = 0; 3291 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3292 if (errcode != arg_in_range) { 3293 jio_fprintf(defaultStream::error_stream(), 3294 "Invalid old PLAB size: %s\n", option->optionString); 3295 describe_range_error(errcode); 3296 return JNI_EINVAL; 3297 } 3298 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3299 jio_fprintf(defaultStream::error_stream(), 3300 "Please use -XX:OldPLABSize in place of " 3301 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3302 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3303 julong young_plab_size = 0; 3304 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3305 if (errcode != arg_in_range) { 3306 jio_fprintf(defaultStream::error_stream(), 3307 "Invalid young PLAB size: %s\n", option->optionString); 3308 describe_range_error(errcode); 3309 return JNI_EINVAL; 3310 } 3311 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3312 jio_fprintf(defaultStream::error_stream(), 3313 "Please use -XX:YoungPLABSize in place of " 3314 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3315 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3316 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3317 julong stack_size = 0; 3318 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3319 if (errcode != arg_in_range) { 3320 jio_fprintf(defaultStream::error_stream(), 3321 "Invalid mark stack size: %s\n", option->optionString); 3322 describe_range_error(errcode); 3323 return JNI_EINVAL; 3324 } 3325 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3326 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3327 julong max_stack_size = 0; 3328 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3329 if (errcode != arg_in_range) { 3330 jio_fprintf(defaultStream::error_stream(), 3331 "Invalid maximum mark stack size: %s\n", 3332 option->optionString); 3333 describe_range_error(errcode); 3334 return JNI_EINVAL; 3335 } 3336 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3337 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3338 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3339 uintx conc_threads = 0; 3340 if (!parse_uintx(tail, &conc_threads, 1)) { 3341 jio_fprintf(defaultStream::error_stream(), 3342 "Invalid concurrent threads: %s\n", option->optionString); 3343 return JNI_EINVAL; 3344 } 3345 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3346 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3347 julong max_direct_memory_size = 0; 3348 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3349 if (errcode != arg_in_range) { 3350 jio_fprintf(defaultStream::error_stream(), 3351 "Invalid maximum direct memory size: %s\n", 3352 option->optionString); 3353 describe_range_error(errcode); 3354 return JNI_EINVAL; 3355 } 3356 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3357 #if !INCLUDE_MANAGEMENT 3358 } else if (match_option(option, "-XX:+ManagementServer", &tail)) { 3359 jio_fprintf(defaultStream::error_stream(), 3360 "ManagementServer is not supported in this VM.\n"); 3361 return JNI_ERR; 3362 #endif // INCLUDE_MANAGEMENT 3363 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3364 // Skip -XX:Flags= since that case has already been handled 3365 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3366 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3367 return JNI_EINVAL; 3368 } 3369 } 3370 // Unknown option 3371 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3372 return JNI_ERR; 3373 } 3374 } 3375 3376 // PrintSharedArchiveAndExit will turn on 3377 // -Xshare:on 3378 // -XX:+TraceClassPaths 3379 if (PrintSharedArchiveAndExit) { 3380 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3381 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3382 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3383 } 3384 3385 // Change the default value for flags which have different default values 3386 // when working with older JDKs. 3387 #ifdef LINUX 3388 if (JDK_Version::current().compare_major(6) <= 0 && 3389 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3390 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3391 } 3392 #endif // LINUX 3393 fix_appclasspath(); 3394 return JNI_OK; 3395 } 3396 3397 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3398 // 3399 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3400 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3401 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3402 // path is treated as the current directory. 3403 // 3404 // This causes problems with CDS, which requires that all directories specified in the classpath 3405 // must be empty. In most cases, applications do NOT want to load classes from the current 3406 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3407 // scripts compatible with CDS. 3408 void Arguments::fix_appclasspath() { 3409 if (IgnoreEmptyClassPaths) { 3410 const char separator = *os::path_separator(); 3411 const char* src = _java_class_path->value(); 3412 3413 // skip over all the leading empty paths 3414 while (*src == separator) { 3415 src ++; 3416 } 3417 3418 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3419 strncpy(copy, src, strlen(src) + 1); 3420 3421 // trim all trailing empty paths 3422 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3423 *tail = '\0'; 3424 } 3425 3426 char from[3] = {separator, separator, '\0'}; 3427 char to [2] = {separator, '\0'}; 3428 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3429 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3430 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3431 } 3432 3433 _java_class_path->set_value(copy); 3434 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3435 } 3436 3437 if (!PrintSharedArchiveAndExit) { 3438 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3439 } 3440 } 3441 3442 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3443 // This must be done after all -D arguments have been processed. 3444 scp_p->expand_endorsed(); 3445 3446 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 3447 // Assemble the bootclasspath elements into the final path. 3448 Arguments::set_sysclasspath(scp_p->combined_path()); 3449 } 3450 3451 // This must be done after all arguments have been processed. 3452 // java_compiler() true means set to "NONE" or empty. 3453 if (java_compiler() && !xdebug_mode()) { 3454 // For backwards compatibility, we switch to interpreted mode if 3455 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3456 // not specified. 3457 set_mode_flags(_int); 3458 } 3459 if (CompileThreshold == 0) { 3460 set_mode_flags(_int); 3461 } 3462 3463 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3464 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3465 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3466 } 3467 3468 #ifndef COMPILER2 3469 // Don't degrade server performance for footprint 3470 if (FLAG_IS_DEFAULT(UseLargePages) && 3471 MaxHeapSize < LargePageHeapSizeThreshold) { 3472 // No need for large granularity pages w/small heaps. 3473 // Note that large pages are enabled/disabled for both the 3474 // Java heap and the code cache. 3475 FLAG_SET_DEFAULT(UseLargePages, false); 3476 } 3477 3478 #else 3479 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3480 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3481 } 3482 #endif 3483 3484 #ifndef TIERED 3485 // Tiered compilation is undefined. 3486 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3487 #endif 3488 3489 // If we are running in a headless jre, force java.awt.headless property 3490 // to be true unless the property has already been set. 3491 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3492 if (os::is_headless_jre()) { 3493 const char* headless = Arguments::get_property("java.awt.headless"); 3494 if (headless == NULL) { 3495 char envbuffer[128]; 3496 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3497 if (!add_property("java.awt.headless=true")) { 3498 return JNI_ENOMEM; 3499 } 3500 } else { 3501 char buffer[256]; 3502 strcpy(buffer, "java.awt.headless="); 3503 strcat(buffer, envbuffer); 3504 if (!add_property(buffer)) { 3505 return JNI_ENOMEM; 3506 } 3507 } 3508 } 3509 } 3510 3511 if (!check_vm_args_consistency()) { 3512 return JNI_ERR; 3513 } 3514 3515 return JNI_OK; 3516 } 3517 3518 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3519 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3520 scp_assembly_required_p); 3521 } 3522 3523 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3524 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3525 scp_assembly_required_p); 3526 } 3527 3528 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3529 const int N_MAX_OPTIONS = 64; 3530 const int OPTION_BUFFER_SIZE = 1024; 3531 char buffer[OPTION_BUFFER_SIZE]; 3532 3533 // The variable will be ignored if it exceeds the length of the buffer. 3534 // Don't check this variable if user has special privileges 3535 // (e.g. unix su command). 3536 if (os::getenv(name, buffer, sizeof(buffer)) && 3537 !os::have_special_privileges()) { 3538 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3539 jio_fprintf(defaultStream::error_stream(), 3540 "Picked up %s: %s\n", name, buffer); 3541 char* rd = buffer; // pointer to the input string (rd) 3542 int i; 3543 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3544 while (isspace(*rd)) rd++; // skip whitespace 3545 if (*rd == 0) break; // we re done when the input string is read completely 3546 3547 // The output, option string, overwrites the input string. 3548 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3549 // input string (rd). 3550 char* wrt = rd; 3551 3552 options[i++].optionString = wrt; // Fill in option 3553 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3554 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3555 int quote = *rd; // matching quote to look for 3556 rd++; // don't copy open quote 3557 while (*rd != quote) { // include everything (even spaces) up until quote 3558 if (*rd == 0) { // string termination means unmatched string 3559 jio_fprintf(defaultStream::error_stream(), 3560 "Unmatched quote in %s\n", name); 3561 return JNI_ERR; 3562 } 3563 *wrt++ = *rd++; // copy to option string 3564 } 3565 rd++; // don't copy close quote 3566 } else { 3567 *wrt++ = *rd++; // copy to option string 3568 } 3569 } 3570 // Need to check if we're done before writing a NULL, 3571 // because the write could be to the byte that rd is pointing to. 3572 if (*rd++ == 0) { 3573 *wrt = 0; 3574 break; 3575 } 3576 *wrt = 0; // Zero terminate option 3577 } 3578 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3579 JavaVMInitArgs vm_args; 3580 vm_args.version = JNI_VERSION_1_2; 3581 vm_args.options = options; 3582 vm_args.nOptions = i; 3583 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3584 3585 if (PrintVMOptions) { 3586 const char* tail; 3587 for (int i = 0; i < vm_args.nOptions; i++) { 3588 const JavaVMOption *option = vm_args.options + i; 3589 if (match_option(option, "-XX:", &tail)) { 3590 logOption(tail); 3591 } 3592 } 3593 } 3594 3595 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3596 } 3597 return JNI_OK; 3598 } 3599 3600 void Arguments::set_shared_spaces_flags() { 3601 if (DumpSharedSpaces) { 3602 if (RequireSharedSpaces) { 3603 warning("cannot dump shared archive while using shared archive"); 3604 } 3605 UseSharedSpaces = false; 3606 #ifdef _LP64 3607 if (!UseCompressedOops || !UseCompressedClassPointers) { 3608 vm_exit_during_initialization( 3609 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3610 } 3611 } else { 3612 if (!UseCompressedOops || !UseCompressedClassPointers) { 3613 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3614 } 3615 #endif 3616 } 3617 } 3618 3619 #if !INCLUDE_ALL_GCS 3620 static void force_serial_gc() { 3621 FLAG_SET_DEFAULT(UseSerialGC, true); 3622 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 3623 UNSUPPORTED_GC_OPTION(UseG1GC); 3624 UNSUPPORTED_GC_OPTION(UseParallelGC); 3625 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3626 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3627 UNSUPPORTED_GC_OPTION(UseParNewGC); 3628 } 3629 #endif // INCLUDE_ALL_GCS 3630 3631 // Sharing support 3632 // Construct the path to the archive 3633 static char* get_shared_archive_path() { 3634 char *shared_archive_path; 3635 if (SharedArchiveFile == NULL) { 3636 char jvm_path[JVM_MAXPATHLEN]; 3637 os::jvm_path(jvm_path, sizeof(jvm_path)); 3638 char *end = strrchr(jvm_path, *os::file_separator()); 3639 if (end != NULL) *end = '\0'; 3640 size_t jvm_path_len = strlen(jvm_path); 3641 size_t file_sep_len = strlen(os::file_separator()); 3642 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3643 file_sep_len + 20, mtInternal); 3644 if (shared_archive_path != NULL) { 3645 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3646 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3647 strncat(shared_archive_path, "classes.jsa", 11); 3648 } 3649 } else { 3650 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3651 if (shared_archive_path != NULL) { 3652 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3653 } 3654 } 3655 return shared_archive_path; 3656 } 3657 3658 #ifndef PRODUCT 3659 // Determine whether LogVMOutput should be implicitly turned on. 3660 static bool use_vm_log() { 3661 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3662 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3663 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3664 PrintAssembly || TraceDeoptimization || TraceDependencies || 3665 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3666 return true; 3667 } 3668 3669 #ifdef COMPILER1 3670 if (PrintC1Statistics) { 3671 return true; 3672 } 3673 #endif // COMPILER1 3674 3675 #ifdef COMPILER2 3676 if (PrintOptoAssembly || PrintOptoStatistics) { 3677 return true; 3678 } 3679 #endif // COMPILER2 3680 3681 return false; 3682 } 3683 #endif // PRODUCT 3684 3685 // Parse entry point called from JNI_CreateJavaVM 3686 3687 jint Arguments::parse(const JavaVMInitArgs* args) { 3688 3689 // Remaining part of option string 3690 const char* tail; 3691 3692 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3693 const char* hotspotrc = ".hotspotrc"; 3694 bool settings_file_specified = false; 3695 bool needs_hotspotrc_warning = false; 3696 3697 const char* flags_file; 3698 int index; 3699 for (index = 0; index < args->nOptions; index++) { 3700 const JavaVMOption *option = args->options + index; 3701 if (match_option(option, "-XX:Flags=", &tail)) { 3702 flags_file = tail; 3703 settings_file_specified = true; 3704 } 3705 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 3706 PrintVMOptions = true; 3707 } 3708 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 3709 PrintVMOptions = false; 3710 } 3711 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 3712 IgnoreUnrecognizedVMOptions = true; 3713 } 3714 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 3715 IgnoreUnrecognizedVMOptions = false; 3716 } 3717 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 3718 CommandLineFlags::printFlags(tty, false); 3719 vm_exit(0); 3720 } 3721 #if INCLUDE_NMT 3722 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3723 // The launcher did not setup nmt environment variable properly. 3724 if (!MemTracker::check_launcher_nmt_support(tail)) { 3725 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3726 } 3727 3728 // Verify if nmt option is valid. 3729 if (MemTracker::verify_nmt_option()) { 3730 // Late initialization, still in single-threaded mode. 3731 if (MemTracker::tracking_level() >= NMT_summary) { 3732 MemTracker::init(); 3733 } 3734 } else { 3735 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3736 } 3737 } 3738 #endif 3739 3740 3741 #ifndef PRODUCT 3742 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 3743 CommandLineFlags::printFlags(tty, true); 3744 vm_exit(0); 3745 } 3746 #endif 3747 } 3748 3749 if (IgnoreUnrecognizedVMOptions) { 3750 // uncast const to modify the flag args->ignoreUnrecognized 3751 *(jboolean*)(&args->ignoreUnrecognized) = true; 3752 } 3753 3754 // Parse specified settings file 3755 if (settings_file_specified) { 3756 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3757 return JNI_EINVAL; 3758 } 3759 } else { 3760 #ifdef ASSERT 3761 // Parse default .hotspotrc settings file 3762 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3763 return JNI_EINVAL; 3764 } 3765 #else 3766 struct stat buf; 3767 if (os::stat(hotspotrc, &buf) == 0) { 3768 needs_hotspotrc_warning = true; 3769 } 3770 #endif 3771 } 3772 3773 if (PrintVMOptions) { 3774 for (index = 0; index < args->nOptions; index++) { 3775 const JavaVMOption *option = args->options + index; 3776 if (match_option(option, "-XX:", &tail)) { 3777 logOption(tail); 3778 } 3779 } 3780 } 3781 3782 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3783 jint result = parse_vm_init_args(args); 3784 if (result != JNI_OK) { 3785 return result; 3786 } 3787 3788 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3789 SharedArchivePath = get_shared_archive_path(); 3790 if (SharedArchivePath == NULL) { 3791 return JNI_ENOMEM; 3792 } 3793 3794 // Delay warning until here so that we've had a chance to process 3795 // the -XX:-PrintWarnings flag 3796 if (needs_hotspotrc_warning) { 3797 warning("%s file is present but has been ignored. " 3798 "Run with -XX:Flags=%s to load the file.", 3799 hotspotrc, hotspotrc); 3800 } 3801 3802 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3803 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3804 #endif 3805 3806 #if INCLUDE_ALL_GCS 3807 #if (defined JAVASE_EMBEDDED || defined ARM) 3808 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3809 #endif 3810 #endif 3811 3812 #ifndef PRODUCT 3813 if (TraceBytecodesAt != 0) { 3814 TraceBytecodes = true; 3815 } 3816 if (CountCompiledCalls) { 3817 if (UseCounterDecay) { 3818 warning("UseCounterDecay disabled because CountCalls is set"); 3819 UseCounterDecay = false; 3820 } 3821 } 3822 #endif // PRODUCT 3823 3824 if (ScavengeRootsInCode == 0) { 3825 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3826 warning("forcing ScavengeRootsInCode non-zero"); 3827 } 3828 ScavengeRootsInCode = 1; 3829 } 3830 3831 if (PrintGCDetails) { 3832 // Turn on -verbose:gc options as well 3833 PrintGC = true; 3834 } 3835 3836 // Set object alignment values. 3837 set_object_alignment(); 3838 3839 #if !INCLUDE_ALL_GCS 3840 force_serial_gc(); 3841 #endif // INCLUDE_ALL_GCS 3842 #if !INCLUDE_CDS 3843 if (DumpSharedSpaces || RequireSharedSpaces) { 3844 jio_fprintf(defaultStream::error_stream(), 3845 "Shared spaces are not supported in this VM\n"); 3846 return JNI_ERR; 3847 } 3848 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3849 warning("Shared spaces are not supported in this VM"); 3850 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3851 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3852 } 3853 no_shared_spaces("CDS Disabled"); 3854 #endif // INCLUDE_CDS 3855 3856 return JNI_OK; 3857 } 3858 3859 jint Arguments::apply_ergo() { 3860 3861 // Set flags based on ergonomics. 3862 set_ergonomics_flags(); 3863 3864 set_shared_spaces_flags(); 3865 3866 // Check the GC selections again. 3867 if (!check_gc_consistency()) { 3868 return JNI_EINVAL; 3869 } 3870 3871 if (TieredCompilation) { 3872 set_tiered_flags(); 3873 } else { 3874 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3875 if (CompilationPolicyChoice >= 2) { 3876 vm_exit_during_initialization( 3877 "Incompatible compilation policy selected", NULL); 3878 } 3879 } 3880 // Set NmethodSweepFraction after the size of the code cache is adapted (in case of tiered) 3881 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3882 FLAG_SET_DEFAULT(NmethodSweepFraction, 1 + ReservedCodeCacheSize / (16 * M)); 3883 } 3884 3885 3886 // Set heap size based on available physical memory 3887 set_heap_size(); 3888 3889 #if INCLUDE_ALL_GCS 3890 // Set per-collector flags 3891 if (UseParallelGC || UseParallelOldGC) { 3892 set_parallel_gc_flags(); 3893 } else if (UseConcMarkSweepGC) { // Should be done before ParNew check below 3894 set_cms_and_parnew_gc_flags(); 3895 } else if (UseParNewGC) { // Skipped if CMS is set above 3896 set_parnew_gc_flags(); 3897 } else if (UseG1GC) { 3898 set_g1_gc_flags(); 3899 } 3900 check_deprecated_gcs(); 3901 check_deprecated_gc_flags(); 3902 if (AssumeMP && !UseSerialGC) { 3903 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 3904 warning("If the number of processors is expected to increase from one, then" 3905 " you should configure the number of parallel GC threads appropriately" 3906 " using -XX:ParallelGCThreads=N"); 3907 } 3908 } 3909 if (MinHeapFreeRatio == 100) { 3910 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 3911 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 3912 } 3913 #else // INCLUDE_ALL_GCS 3914 assert(verify_serial_gc_flags(), "SerialGC unset"); 3915 #endif // INCLUDE_ALL_GCS 3916 3917 // Initialize Metaspace flags and alignments 3918 Metaspace::ergo_initialize(); 3919 3920 // Set bytecode rewriting flags 3921 set_bytecode_flags(); 3922 3923 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3924 set_aggressive_opts_flags(); 3925 3926 // Turn off biased locking for locking debug mode flags, 3927 // which are subtly different from each other but neither works with 3928 // biased locking 3929 if (UseHeavyMonitors 3930 #ifdef COMPILER1 3931 || !UseFastLocking 3932 #endif // COMPILER1 3933 ) { 3934 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3935 // flag set to true on command line; warn the user that they 3936 // can't enable biased locking here 3937 warning("Biased Locking is not supported with locking debug flags" 3938 "; ignoring UseBiasedLocking flag." ); 3939 } 3940 UseBiasedLocking = false; 3941 } 3942 3943 #ifdef ZERO 3944 // Clear flags not supported on zero. 3945 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3946 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3947 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3948 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3949 #endif // CC_INTERP 3950 3951 #ifdef COMPILER2 3952 if (!EliminateLocks) { 3953 EliminateNestedLocks = false; 3954 } 3955 if (!Inline) { 3956 IncrementalInline = false; 3957 } 3958 #ifndef PRODUCT 3959 if (!IncrementalInline) { 3960 AlwaysIncrementalInline = false; 3961 } 3962 #endif 3963 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3964 // nothing to use the profiling, turn if off 3965 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3966 } 3967 #endif 3968 3969 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3970 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3971 DebugNonSafepoints = true; 3972 } 3973 3974 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3975 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3976 } 3977 3978 #ifndef PRODUCT 3979 if (CompileTheWorld) { 3980 // Force NmethodSweeper to sweep whole CodeCache each time. 3981 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3982 NmethodSweepFraction = 1; 3983 } 3984 } 3985 3986 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3987 if (use_vm_log()) { 3988 LogVMOutput = true; 3989 } 3990 } 3991 #endif // PRODUCT 3992 3993 if (PrintCommandLineFlags) { 3994 CommandLineFlags::printSetFlags(tty); 3995 } 3996 3997 // Apply CPU specific policy for the BiasedLocking 3998 if (UseBiasedLocking) { 3999 if (!VM_Version::use_biased_locking() && 4000 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4001 UseBiasedLocking = false; 4002 } 4003 } 4004 #ifdef COMPILER2 4005 if (!UseBiasedLocking || EmitSync != 0) { 4006 UseOptoBiasInlining = false; 4007 } 4008 #endif 4009 4010 return JNI_OK; 4011 } 4012 4013 jint Arguments::adjust_after_os() { 4014 if (UseNUMA) { 4015 if (UseParallelGC || UseParallelOldGC) { 4016 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4017 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4018 } 4019 } 4020 // UseNUMAInterleaving is set to ON for all collectors and 4021 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4022 // such as the parallel collector for Linux and Solaris will 4023 // interleave old gen and survivor spaces on top of NUMA 4024 // allocation policy for the eden space. 4025 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4026 // all platforms and ParallelGC on Windows will interleave all 4027 // of the heap spaces across NUMA nodes. 4028 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4029 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4030 } 4031 } 4032 return JNI_OK; 4033 } 4034 4035 int Arguments::PropertyList_count(SystemProperty* pl) { 4036 int count = 0; 4037 while(pl != NULL) { 4038 count++; 4039 pl = pl->next(); 4040 } 4041 return count; 4042 } 4043 4044 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4045 assert(key != NULL, "just checking"); 4046 SystemProperty* prop; 4047 for (prop = pl; prop != NULL; prop = prop->next()) { 4048 if (strcmp(key, prop->key()) == 0) return prop->value(); 4049 } 4050 return NULL; 4051 } 4052 4053 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4054 int count = 0; 4055 const char* ret_val = NULL; 4056 4057 while(pl != NULL) { 4058 if(count >= index) { 4059 ret_val = pl->key(); 4060 break; 4061 } 4062 count++; 4063 pl = pl->next(); 4064 } 4065 4066 return ret_val; 4067 } 4068 4069 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4070 int count = 0; 4071 char* ret_val = NULL; 4072 4073 while(pl != NULL) { 4074 if(count >= index) { 4075 ret_val = pl->value(); 4076 break; 4077 } 4078 count++; 4079 pl = pl->next(); 4080 } 4081 4082 return ret_val; 4083 } 4084 4085 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4086 SystemProperty* p = *plist; 4087 if (p == NULL) { 4088 *plist = new_p; 4089 } else { 4090 while (p->next() != NULL) { 4091 p = p->next(); 4092 } 4093 p->set_next(new_p); 4094 } 4095 } 4096 4097 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4098 if (plist == NULL) 4099 return; 4100 4101 SystemProperty* new_p = new SystemProperty(k, v, true); 4102 PropertyList_add(plist, new_p); 4103 } 4104 4105 // This add maintains unique property key in the list. 4106 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4107 if (plist == NULL) 4108 return; 4109 4110 // If property key exist then update with new value. 4111 SystemProperty* prop; 4112 for (prop = *plist; prop != NULL; prop = prop->next()) { 4113 if (strcmp(k, prop->key()) == 0) { 4114 if (append) { 4115 prop->append_value(v); 4116 } else { 4117 prop->set_value(v); 4118 } 4119 return; 4120 } 4121 } 4122 4123 PropertyList_add(plist, k, v); 4124 } 4125 4126 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4127 // Returns true if all of the source pointed by src has been copied over to 4128 // the destination buffer pointed by buf. Otherwise, returns false. 4129 // Notes: 4130 // 1. If the length (buflen) of the destination buffer excluding the 4131 // NULL terminator character is not long enough for holding the expanded 4132 // pid characters, it also returns false instead of returning the partially 4133 // expanded one. 4134 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4135 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4136 char* buf, size_t buflen) { 4137 const char* p = src; 4138 char* b = buf; 4139 const char* src_end = &src[srclen]; 4140 char* buf_end = &buf[buflen - 1]; 4141 4142 while (p < src_end && b < buf_end) { 4143 if (*p == '%') { 4144 switch (*(++p)) { 4145 case '%': // "%%" ==> "%" 4146 *b++ = *p++; 4147 break; 4148 case 'p': { // "%p" ==> current process id 4149 // buf_end points to the character before the last character so 4150 // that we could write '\0' to the end of the buffer. 4151 size_t buf_sz = buf_end - b + 1; 4152 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4153 4154 // if jio_snprintf fails or the buffer is not long enough to hold 4155 // the expanded pid, returns false. 4156 if (ret < 0 || ret >= (int)buf_sz) { 4157 return false; 4158 } else { 4159 b += ret; 4160 assert(*b == '\0', "fail in copy_expand_pid"); 4161 if (p == src_end && b == buf_end + 1) { 4162 // reach the end of the buffer. 4163 return true; 4164 } 4165 } 4166 p++; 4167 break; 4168 } 4169 default : 4170 *b++ = '%'; 4171 } 4172 } else { 4173 *b++ = *p++; 4174 } 4175 } 4176 *b = '\0'; 4177 return (p == src_end); // return false if not all of the source was copied 4178 }