1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "compiler/compilerOracle.hpp" 31 #include "memory/allocation.inline.hpp" 32 #include "memory/cardTableRS.hpp" 33 #include "memory/genCollectedHeap.hpp" 34 #include "memory/referenceProcessor.hpp" 35 #include "memory/universe.inline.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "prims/jvmtiExport.hpp" 38 #include "runtime/arguments.hpp" 39 #include "runtime/arguments_ext.hpp" 40 #include "runtime/globals_extension.hpp" 41 #include "runtime/java.hpp" 42 #include "runtime/os.hpp" 43 #include "runtime/vm_version.hpp" 44 #include "services/management.hpp" 45 #include "services/memTracker.hpp" 46 #include "utilities/defaultStream.hpp" 47 #include "utilities/macros.hpp" 48 #include "utilities/stringUtils.hpp" 49 #include "utilities/taskqueue.hpp" 50 #if INCLUDE_ALL_GCS 51 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 53 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 54 #endif // INCLUDE_ALL_GCS 55 56 // Note: This is a special bug reporting site for the JVM 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 58 #define DEFAULT_JAVA_LAUNCHER "generic" 59 60 // Disable options not supported in this release, with a warning if they 61 // were explicitly requested on the command-line 62 #define UNSUPPORTED_OPTION(opt, description) \ 63 do { \ 64 if (opt) { \ 65 if (FLAG_IS_CMDLINE(opt)) { \ 66 warning(description " is disabled in this release."); \ 67 } \ 68 FLAG_SET_DEFAULT(opt, false); \ 69 } \ 70 } while(0) 71 72 #define UNSUPPORTED_GC_OPTION(gc) \ 73 do { \ 74 if (gc) { \ 75 if (FLAG_IS_CMDLINE(gc)) { \ 76 warning(#gc " is not supported in this VM. Using Serial GC."); \ 77 } \ 78 FLAG_SET_DEFAULT(gc, false); \ 79 } \ 80 } while(0) 81 82 char** Arguments::_jvm_flags_array = NULL; 83 int Arguments::_num_jvm_flags = 0; 84 char** Arguments::_jvm_args_array = NULL; 85 int Arguments::_num_jvm_args = 0; 86 char* Arguments::_java_command = NULL; 87 SystemProperty* Arguments::_system_properties = NULL; 88 const char* Arguments::_gc_log_filename = NULL; 89 bool Arguments::_has_profile = false; 90 size_t Arguments::_conservative_max_heap_alignment = 0; 91 uintx Arguments::_min_heap_size = 0; 92 uintx Arguments::_min_heap_free_ratio = 0; 93 uintx Arguments::_max_heap_free_ratio = 0; 94 Arguments::Mode Arguments::_mode = _mixed; 95 bool Arguments::_java_compiler = false; 96 bool Arguments::_xdebug_mode = false; 97 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 98 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 99 int Arguments::_sun_java_launcher_pid = -1; 100 bool Arguments::_sun_java_launcher_is_altjvm = false; 101 102 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 103 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 104 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 105 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 106 bool Arguments::_ClipInlining = ClipInlining; 107 108 char* Arguments::SharedArchivePath = NULL; 109 110 AgentLibraryList Arguments::_libraryList; 111 AgentLibraryList Arguments::_agentList; 112 113 abort_hook_t Arguments::_abort_hook = NULL; 114 exit_hook_t Arguments::_exit_hook = NULL; 115 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 116 117 118 SystemProperty *Arguments::_sun_boot_library_path = NULL; 119 SystemProperty *Arguments::_java_library_path = NULL; 120 SystemProperty *Arguments::_java_home = NULL; 121 SystemProperty *Arguments::_java_class_path = NULL; 122 SystemProperty *Arguments::_sun_boot_class_path = NULL; 123 124 char* Arguments::_meta_index_path = NULL; 125 char* Arguments::_meta_index_dir = NULL; 126 char* Arguments::_ext_dirs = NULL; 127 128 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 129 // part of the option string. 130 static bool match_option(const JavaVMOption *option, const char* name, 131 const char** tail) { 132 int len = (int)strlen(name); 133 if (strncmp(option->optionString, name, len) == 0) { 134 *tail = option->optionString + len; 135 return true; 136 } else { 137 return false; 138 } 139 } 140 141 // Check if 'option' matches 'name'. No "tail" is allowed. 142 static bool match_option(const JavaVMOption *option, const char* name) { 143 const char* tail = NULL; 144 bool result = match_option(option, name, &tail); 145 if (tail != NULL && *tail == '\0') { 146 return result; 147 } else { 148 return false; 149 } 150 } 151 152 // Return true if any of the strings in null-terminated array 'names' matches. 153 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 154 // the option must match exactly. 155 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 156 bool tail_allowed) { 157 for (/* empty */; *names != NULL; ++names) { 158 if (match_option(option, *names, tail)) { 159 if (**tail == '\0' || tail_allowed && **tail == ':') { 160 return true; 161 } 162 } 163 } 164 return false; 165 } 166 167 static void logOption(const char* opt) { 168 if (PrintVMOptions) { 169 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 170 } 171 } 172 173 // Process java launcher properties. 174 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 175 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 176 // sun.java.launcher.pid is defined. 177 // Must do this before setting up other system properties, 178 // as some of them may depend on launcher type. 179 for (int index = 0; index < args->nOptions; index++) { 180 const JavaVMOption* option = args->options + index; 181 const char* tail; 182 183 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 184 process_java_launcher_argument(tail, option->extraInfo); 185 continue; 186 } 187 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 188 if (strcmp(tail, "true") == 0) { 189 _sun_java_launcher_is_altjvm = true; 190 } 191 continue; 192 } 193 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 194 _sun_java_launcher_pid = atoi(tail); 195 continue; 196 } 197 } 198 } 199 200 // Initialize system properties key and value. 201 void Arguments::init_system_properties() { 202 203 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 204 "Java Virtual Machine Specification", false)); 205 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 206 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 207 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 208 209 // Following are JVMTI agent writable properties. 210 // Properties values are set to NULL and they are 211 // os specific they are initialized in os::init_system_properties_values(). 212 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 213 _java_library_path = new SystemProperty("java.library.path", NULL, true); 214 _java_home = new SystemProperty("java.home", NULL, true); 215 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 216 217 _java_class_path = new SystemProperty("java.class.path", "", true); 218 219 // Add to System Property list. 220 PropertyList_add(&_system_properties, _sun_boot_library_path); 221 PropertyList_add(&_system_properties, _java_library_path); 222 PropertyList_add(&_system_properties, _java_home); 223 PropertyList_add(&_system_properties, _java_class_path); 224 PropertyList_add(&_system_properties, _sun_boot_class_path); 225 226 // Set OS specific system properties values 227 os::init_system_properties_values(); 228 } 229 230 231 // Update/Initialize System properties after JDK version number is known 232 void Arguments::init_version_specific_system_properties() { 233 enum { bufsz = 16 }; 234 char buffer[bufsz]; 235 const char* spec_vendor = "Sun Microsystems Inc."; 236 uint32_t spec_version = 0; 237 238 spec_vendor = "Oracle Corporation"; 239 spec_version = JDK_Version::current().major_version(); 240 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 241 242 PropertyList_add(&_system_properties, 243 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 244 PropertyList_add(&_system_properties, 245 new SystemProperty("java.vm.specification.version", buffer, false)); 246 PropertyList_add(&_system_properties, 247 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 248 } 249 250 /** 251 * Provide a slightly more user-friendly way of eliminating -XX flags. 252 * When a flag is eliminated, it can be added to this list in order to 253 * continue accepting this flag on the command-line, while issuing a warning 254 * and ignoring the value. Once the JDK version reaches the 'accept_until' 255 * limit, we flatly refuse to admit the existence of the flag. This allows 256 * a flag to die correctly over JDK releases using HSX. 257 */ 258 typedef struct { 259 const char* name; 260 JDK_Version obsoleted_in; // when the flag went away 261 JDK_Version accept_until; // which version to start denying the existence 262 } ObsoleteFlag; 263 264 static ObsoleteFlag obsolete_jvm_flags[] = { 265 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 266 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 267 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 268 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 269 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 270 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 271 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 272 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 273 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 274 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 275 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 276 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 277 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 278 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 279 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 280 { "DefaultInitialRAMFraction", 281 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 282 { "UseDepthFirstScavengeOrder", 283 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 284 { "HandlePromotionFailure", 285 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 286 { "MaxLiveObjectEvacuationRatio", 287 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 288 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 289 { "UseParallelOldGCCompacting", 290 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 291 { "UseParallelDensePrefixUpdate", 292 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 293 { "UseParallelOldGCDensePrefix", 294 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 295 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 296 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 297 { "CMSPermGenPrecleaningEnabled", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 298 { "CMSTriggerPermRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 299 { "CMSInitiatingPermOccupancyFraction", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 300 { "AdaptivePermSizeWeight", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 301 { "PermGenPadding", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 302 { "PermMarkSweepDeadRatio", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 303 { "PermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 304 { "MaxPermSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 305 { "MinPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 306 { "MaxPermHeapExpansion", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 307 { "CMSRevisitStackSize", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 308 { "PrintRevisitStats", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 309 { "UseVectoredExceptions", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 310 { "UseSplitVerifier", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 311 { "UseISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 312 { "UsePermISM", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 313 { "UseMPSS", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 314 { "UseStringCache", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 315 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 316 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 317 #ifdef PRODUCT 318 { "DesiredMethodLimit", 319 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 320 #endif // PRODUCT 321 { "UseVMInterruptibleIO", JDK_Version::jdk(8), JDK_Version::jdk(9) }, 322 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 323 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 324 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 325 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 326 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 327 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 328 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 329 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 330 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 331 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 332 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 333 #ifndef ZERO 334 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 335 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 336 #endif // ZERO 337 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 338 { NULL, JDK_Version(0), JDK_Version(0) } 339 }; 340 341 // Returns true if the flag is obsolete and fits into the range specified 342 // for being ignored. In the case that the flag is ignored, the 'version' 343 // value is filled in with the version number when the flag became 344 // obsolete so that that value can be displayed to the user. 345 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 346 int i = 0; 347 assert(version != NULL, "Must provide a version buffer"); 348 while (obsolete_jvm_flags[i].name != NULL) { 349 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 350 // <flag>=xxx form 351 // [-|+]<flag> form 352 size_t len = strlen(flag_status.name); 353 if (((strncmp(flag_status.name, s, len) == 0) && 354 (strlen(s) == len)) || 355 ((s[0] == '+' || s[0] == '-') && 356 (strncmp(flag_status.name, &s[1], len) == 0) && 357 (strlen(&s[1]) == len))) { 358 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 359 *version = flag_status.obsoleted_in; 360 return true; 361 } 362 } 363 i++; 364 } 365 return false; 366 } 367 368 // Constructs the system class path (aka boot class path) from the following 369 // components, in order: 370 // 371 // prefix // from -Xbootclasspath/p:... 372 // base // from os::get_system_properties() or -Xbootclasspath= 373 // suffix // from -Xbootclasspath/a:... 374 // 375 // This could be AllStatic, but it isn't needed after argument processing is 376 // complete. 377 class SysClassPath: public StackObj { 378 public: 379 SysClassPath(const char* base); 380 ~SysClassPath(); 381 382 inline void set_base(const char* base); 383 inline void add_prefix(const char* prefix); 384 inline void add_suffix_to_prefix(const char* suffix); 385 inline void add_suffix(const char* suffix); 386 inline void reset_path(const char* base); 387 388 inline const char* get_base() const { return _items[_scp_base]; } 389 inline const char* get_prefix() const { return _items[_scp_prefix]; } 390 inline const char* get_suffix() const { return _items[_scp_suffix]; } 391 392 // Combine all the components into a single c-heap-allocated string; caller 393 // must free the string if/when no longer needed. 394 char* combined_path(); 395 396 private: 397 // Utility routines. 398 static char* add_to_path(const char* path, const char* str, bool prepend); 399 static char* add_jars_to_path(char* path, const char* directory); 400 401 inline void reset_item_at(int index); 402 403 // Array indices for the items that make up the sysclasspath. All except the 404 // base are allocated in the C heap and freed by this class. 405 enum { 406 _scp_prefix, // from -Xbootclasspath/p:... 407 _scp_base, // the default sysclasspath 408 _scp_suffix, // from -Xbootclasspath/a:... 409 _scp_nitems // the number of items, must be last. 410 }; 411 412 const char* _items[_scp_nitems]; 413 }; 414 415 SysClassPath::SysClassPath(const char* base) { 416 memset(_items, 0, sizeof(_items)); 417 _items[_scp_base] = base; 418 } 419 420 SysClassPath::~SysClassPath() { 421 // Free everything except the base. 422 for (int i = 0; i < _scp_nitems; ++i) { 423 if (i != _scp_base) reset_item_at(i); 424 } 425 } 426 427 inline void SysClassPath::set_base(const char* base) { 428 _items[_scp_base] = base; 429 } 430 431 inline void SysClassPath::add_prefix(const char* prefix) { 432 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 433 } 434 435 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 436 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 437 } 438 439 inline void SysClassPath::add_suffix(const char* suffix) { 440 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 441 } 442 443 inline void SysClassPath::reset_item_at(int index) { 444 assert(index < _scp_nitems && index != _scp_base, "just checking"); 445 if (_items[index] != NULL) { 446 FREE_C_HEAP_ARRAY(char, _items[index]); 447 _items[index] = NULL; 448 } 449 } 450 451 inline void SysClassPath::reset_path(const char* base) { 452 // Clear the prefix and suffix. 453 reset_item_at(_scp_prefix); 454 reset_item_at(_scp_suffix); 455 set_base(base); 456 } 457 458 //------------------------------------------------------------------------------ 459 460 461 // Combine the bootclasspath elements, some of which may be null, into a single 462 // c-heap-allocated string. 463 char* SysClassPath::combined_path() { 464 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 465 466 size_t lengths[_scp_nitems]; 467 size_t total_len = 0; 468 469 const char separator = *os::path_separator(); 470 471 // Get the lengths. 472 int i; 473 for (i = 0; i < _scp_nitems; ++i) { 474 if (_items[i] != NULL) { 475 lengths[i] = strlen(_items[i]); 476 // Include space for the separator char (or a NULL for the last item). 477 total_len += lengths[i] + 1; 478 } 479 } 480 assert(total_len > 0, "empty sysclasspath not allowed"); 481 482 // Copy the _items to a single string. 483 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 484 char* cp_tmp = cp; 485 for (i = 0; i < _scp_nitems; ++i) { 486 if (_items[i] != NULL) { 487 memcpy(cp_tmp, _items[i], lengths[i]); 488 cp_tmp += lengths[i]; 489 *cp_tmp++ = separator; 490 } 491 } 492 *--cp_tmp = '\0'; // Replace the extra separator. 493 return cp; 494 } 495 496 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 497 char* 498 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 499 char *cp; 500 501 assert(str != NULL, "just checking"); 502 if (path == NULL) { 503 size_t len = strlen(str) + 1; 504 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 505 memcpy(cp, str, len); // copy the trailing null 506 } else { 507 const char separator = *os::path_separator(); 508 size_t old_len = strlen(path); 509 size_t str_len = strlen(str); 510 size_t len = old_len + str_len + 2; 511 512 if (prepend) { 513 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 514 char* cp_tmp = cp; 515 memcpy(cp_tmp, str, str_len); 516 cp_tmp += str_len; 517 *cp_tmp = separator; 518 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 519 FREE_C_HEAP_ARRAY(char, path); 520 } else { 521 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 522 char* cp_tmp = cp + old_len; 523 *cp_tmp = separator; 524 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 525 } 526 } 527 return cp; 528 } 529 530 // Scan the directory and append any jar or zip files found to path. 531 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 532 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 533 DIR* dir = os::opendir(directory); 534 if (dir == NULL) return path; 535 536 char dir_sep[2] = { '\0', '\0' }; 537 size_t directory_len = strlen(directory); 538 const char fileSep = *os::file_separator(); 539 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 540 541 /* Scan the directory for jars/zips, appending them to path. */ 542 struct dirent *entry; 543 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 544 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 545 const char* name = entry->d_name; 546 const char* ext = name + strlen(name) - 4; 547 bool isJarOrZip = ext > name && 548 (os::file_name_strcmp(ext, ".jar") == 0 || 549 os::file_name_strcmp(ext, ".zip") == 0); 550 if (isJarOrZip) { 551 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 552 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 553 path = add_to_path(path, jarpath, false); 554 FREE_C_HEAP_ARRAY(char, jarpath); 555 } 556 } 557 FREE_C_HEAP_ARRAY(char, dbuf); 558 os::closedir(dir); 559 return path; 560 } 561 562 // Parses a memory size specification string. 563 static bool atomull(const char *s, julong* result) { 564 julong n = 0; 565 int args_read = 0; 566 bool is_hex = false; 567 // Skip leading 0[xX] for hexadecimal 568 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 569 s += 2; 570 is_hex = true; 571 args_read = sscanf(s, JULONG_FORMAT_X, &n); 572 } else { 573 args_read = sscanf(s, JULONG_FORMAT, &n); 574 } 575 if (args_read != 1) { 576 return false; 577 } 578 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 579 s++; 580 } 581 // 4705540: illegal if more characters are found after the first non-digit 582 if (strlen(s) > 1) { 583 return false; 584 } 585 switch (*s) { 586 case 'T': case 't': 587 *result = n * G * K; 588 // Check for overflow. 589 if (*result/((julong)G * K) != n) return false; 590 return true; 591 case 'G': case 'g': 592 *result = n * G; 593 if (*result/G != n) return false; 594 return true; 595 case 'M': case 'm': 596 *result = n * M; 597 if (*result/M != n) return false; 598 return true; 599 case 'K': case 'k': 600 *result = n * K; 601 if (*result/K != n) return false; 602 return true; 603 case '\0': 604 *result = n; 605 return true; 606 default: 607 return false; 608 } 609 } 610 611 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 612 if (size < min_size) return arg_too_small; 613 // Check that size will fit in a size_t (only relevant on 32-bit) 614 if (size > max_uintx) return arg_too_big; 615 return arg_in_range; 616 } 617 618 // Describe an argument out of range error 619 void Arguments::describe_range_error(ArgsRange errcode) { 620 switch(errcode) { 621 case arg_too_big: 622 jio_fprintf(defaultStream::error_stream(), 623 "The specified size exceeds the maximum " 624 "representable size.\n"); 625 break; 626 case arg_too_small: 627 case arg_unreadable: 628 case arg_in_range: 629 // do nothing for now 630 break; 631 default: 632 ShouldNotReachHere(); 633 } 634 } 635 636 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 637 return CommandLineFlags::boolAtPut(name, &value, origin); 638 } 639 640 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 641 double v; 642 if (sscanf(value, "%lf", &v) != 1) { 643 return false; 644 } 645 646 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 647 return true; 648 } 649 return false; 650 } 651 652 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 653 julong v; 654 intx intx_v; 655 bool is_neg = false; 656 // Check the sign first since atomull() parses only unsigned values. 657 if (*value == '-') { 658 if (!CommandLineFlags::intxAt(name, &intx_v)) { 659 return false; 660 } 661 value++; 662 is_neg = true; 663 } 664 if (!atomull(value, &v)) { 665 return false; 666 } 667 intx_v = (intx) v; 668 if (is_neg) { 669 intx_v = -intx_v; 670 } 671 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 672 return true; 673 } 674 uintx uintx_v = (uintx) v; 675 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 676 return true; 677 } 678 uint64_t uint64_t_v = (uint64_t) v; 679 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 680 return true; 681 } 682 size_t size_t_v = (size_t) v; 683 if (!is_neg && CommandLineFlags::size_tAtPut(name, &size_t_v, origin)) { 684 return true; 685 } 686 return false; 687 } 688 689 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 690 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 691 // Contract: CommandLineFlags always returns a pointer that needs freeing. 692 FREE_C_HEAP_ARRAY(char, value); 693 return true; 694 } 695 696 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 697 const char* old_value = ""; 698 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 699 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 700 size_t new_len = strlen(new_value); 701 const char* value; 702 char* free_this_too = NULL; 703 if (old_len == 0) { 704 value = new_value; 705 } else if (new_len == 0) { 706 value = old_value; 707 } else { 708 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 709 // each new setting adds another LINE to the switch: 710 sprintf(buf, "%s\n%s", old_value, new_value); 711 value = buf; 712 free_this_too = buf; 713 } 714 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 715 // CommandLineFlags always returns a pointer that needs freeing. 716 FREE_C_HEAP_ARRAY(char, value); 717 if (free_this_too != NULL) { 718 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 719 FREE_C_HEAP_ARRAY(char, free_this_too); 720 } 721 return true; 722 } 723 724 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 725 726 // range of acceptable characters spelled out for portability reasons 727 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 728 #define BUFLEN 255 729 char name[BUFLEN+1]; 730 char dummy; 731 732 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 733 return set_bool_flag(name, false, origin); 734 } 735 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 736 return set_bool_flag(name, true, origin); 737 } 738 739 char punct; 740 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 741 const char* value = strchr(arg, '=') + 1; 742 Flag* flag = Flag::find_flag(name, strlen(name)); 743 if (flag != NULL && flag->is_ccstr()) { 744 if (flag->ccstr_accumulates()) { 745 return append_to_string_flag(name, value, origin); 746 } else { 747 if (value[0] == '\0') { 748 value = NULL; 749 } 750 return set_string_flag(name, value, origin); 751 } 752 } 753 } 754 755 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 756 const char* value = strchr(arg, '=') + 1; 757 // -XX:Foo:=xxx will reset the string flag to the given value. 758 if (value[0] == '\0') { 759 value = NULL; 760 } 761 return set_string_flag(name, value, origin); 762 } 763 764 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 765 #define SIGNED_NUMBER_RANGE "[-0123456789]" 766 #define NUMBER_RANGE "[0123456789]" 767 char value[BUFLEN + 1]; 768 char value2[BUFLEN + 1]; 769 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 770 // Looks like a floating-point number -- try again with more lenient format string 771 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 772 return set_fp_numeric_flag(name, value, origin); 773 } 774 } 775 776 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 777 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 778 return set_numeric_flag(name, value, origin); 779 } 780 781 return false; 782 } 783 784 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 785 assert(bldarray != NULL, "illegal argument"); 786 787 if (arg == NULL) { 788 return; 789 } 790 791 int new_count = *count + 1; 792 793 // expand the array and add arg to the last element 794 if (*bldarray == NULL) { 795 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 796 } else { 797 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 798 } 799 (*bldarray)[*count] = os::strdup_check_oom(arg); 800 *count = new_count; 801 } 802 803 void Arguments::build_jvm_args(const char* arg) { 804 add_string(&_jvm_args_array, &_num_jvm_args, arg); 805 } 806 807 void Arguments::build_jvm_flags(const char* arg) { 808 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 809 } 810 811 // utility function to return a string that concatenates all 812 // strings in a given char** array 813 const char* Arguments::build_resource_string(char** args, int count) { 814 if (args == NULL || count == 0) { 815 return NULL; 816 } 817 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 818 for (int i = 1; i < count; i++) { 819 length += strlen(args[i]) + 1; // add 1 for a space 820 } 821 char* s = NEW_RESOURCE_ARRAY(char, length); 822 strcpy(s, args[0]); 823 for (int j = 1; j < count; j++) { 824 strcat(s, " "); 825 strcat(s, args[j]); 826 } 827 return (const char*) s; 828 } 829 830 void Arguments::print_on(outputStream* st) { 831 st->print_cr("VM Arguments:"); 832 if (num_jvm_flags() > 0) { 833 st->print("jvm_flags: "); print_jvm_flags_on(st); 834 } 835 if (num_jvm_args() > 0) { 836 st->print("jvm_args: "); print_jvm_args_on(st); 837 } 838 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 839 if (_java_class_path != NULL) { 840 char* path = _java_class_path->value(); 841 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 842 } 843 st->print_cr("Launcher Type: %s", _sun_java_launcher); 844 } 845 846 void Arguments::print_jvm_flags_on(outputStream* st) { 847 if (_num_jvm_flags > 0) { 848 for (int i=0; i < _num_jvm_flags; i++) { 849 st->print("%s ", _jvm_flags_array[i]); 850 } 851 st->cr(); 852 } 853 } 854 855 void Arguments::print_jvm_args_on(outputStream* st) { 856 if (_num_jvm_args > 0) { 857 for (int i=0; i < _num_jvm_args; i++) { 858 st->print("%s ", _jvm_args_array[i]); 859 } 860 st->cr(); 861 } 862 } 863 864 bool Arguments::process_argument(const char* arg, 865 jboolean ignore_unrecognized, Flag::Flags origin) { 866 867 JDK_Version since = JDK_Version(); 868 869 if (parse_argument(arg, origin) || ignore_unrecognized) { 870 return true; 871 } 872 873 bool has_plus_minus = (*arg == '+' || *arg == '-'); 874 const char* const argname = has_plus_minus ? arg + 1 : arg; 875 if (is_newly_obsolete(arg, &since)) { 876 char version[256]; 877 since.to_string(version, sizeof(version)); 878 warning("ignoring option %s; support was removed in %s", argname, version); 879 return true; 880 } 881 882 // For locked flags, report a custom error message if available. 883 // Otherwise, report the standard unrecognized VM option. 884 885 size_t arg_len; 886 const char* equal_sign = strchr(argname, '='); 887 if (equal_sign == NULL) { 888 arg_len = strlen(argname); 889 } else { 890 arg_len = equal_sign - argname; 891 } 892 893 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 894 if (found_flag != NULL) { 895 char locked_message_buf[BUFLEN]; 896 found_flag->get_locked_message(locked_message_buf, BUFLEN); 897 if (strlen(locked_message_buf) == 0) { 898 if (found_flag->is_bool() && !has_plus_minus) { 899 jio_fprintf(defaultStream::error_stream(), 900 "Missing +/- setting for VM option '%s'\n", argname); 901 } else if (!found_flag->is_bool() && has_plus_minus) { 902 jio_fprintf(defaultStream::error_stream(), 903 "Unexpected +/- setting in VM option '%s'\n", argname); 904 } else { 905 jio_fprintf(defaultStream::error_stream(), 906 "Improperly specified VM option '%s'\n", argname); 907 } 908 } else { 909 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 910 } 911 } else { 912 jio_fprintf(defaultStream::error_stream(), 913 "Unrecognized VM option '%s'\n", argname); 914 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 915 if (fuzzy_matched != NULL) { 916 jio_fprintf(defaultStream::error_stream(), 917 "Did you mean '%s%s%s'? ", 918 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 919 fuzzy_matched->_name, 920 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 921 if (is_newly_obsolete(fuzzy_matched->_name, &since)) { 922 char version[256]; 923 since.to_string(version, sizeof(version)); 924 jio_fprintf(defaultStream::error_stream(), 925 "Warning: support for %s was removed in %s\n", 926 fuzzy_matched->_name, 927 version); 928 } 929 } 930 } 931 932 // allow for commandline "commenting out" options like -XX:#+Verbose 933 return arg[0] == '#'; 934 } 935 936 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 937 FILE* stream = fopen(file_name, "rb"); 938 if (stream == NULL) { 939 if (should_exist) { 940 jio_fprintf(defaultStream::error_stream(), 941 "Could not open settings file %s\n", file_name); 942 return false; 943 } else { 944 return true; 945 } 946 } 947 948 char token[1024]; 949 int pos = 0; 950 951 bool in_white_space = true; 952 bool in_comment = false; 953 bool in_quote = false; 954 char quote_c = 0; 955 bool result = true; 956 957 int c = getc(stream); 958 while(c != EOF && pos < (int)(sizeof(token)-1)) { 959 if (in_white_space) { 960 if (in_comment) { 961 if (c == '\n') in_comment = false; 962 } else { 963 if (c == '#') in_comment = true; 964 else if (!isspace(c)) { 965 in_white_space = false; 966 token[pos++] = c; 967 } 968 } 969 } else { 970 if (c == '\n' || (!in_quote && isspace(c))) { 971 // token ends at newline, or at unquoted whitespace 972 // this allows a way to include spaces in string-valued options 973 token[pos] = '\0'; 974 logOption(token); 975 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 976 build_jvm_flags(token); 977 pos = 0; 978 in_white_space = true; 979 in_quote = false; 980 } else if (!in_quote && (c == '\'' || c == '"')) { 981 in_quote = true; 982 quote_c = c; 983 } else if (in_quote && (c == quote_c)) { 984 in_quote = false; 985 } else { 986 token[pos++] = c; 987 } 988 } 989 c = getc(stream); 990 } 991 if (pos > 0) { 992 token[pos] = '\0'; 993 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 994 build_jvm_flags(token); 995 } 996 fclose(stream); 997 return result; 998 } 999 1000 //============================================================================================================= 1001 // Parsing of properties (-D) 1002 1003 const char* Arguments::get_property(const char* key) { 1004 return PropertyList_get_value(system_properties(), key); 1005 } 1006 1007 bool Arguments::add_property(const char* prop) { 1008 const char* eq = strchr(prop, '='); 1009 char* key; 1010 // ns must be static--its address may be stored in a SystemProperty object. 1011 const static char ns[1] = {0}; 1012 char* value = (char *)ns; 1013 1014 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 1015 key = AllocateHeap(key_len + 1, mtInternal); 1016 strncpy(key, prop, key_len); 1017 key[key_len] = '\0'; 1018 1019 if (eq != NULL) { 1020 size_t value_len = strlen(prop) - key_len - 1; 1021 value = AllocateHeap(value_len + 1, mtInternal); 1022 strncpy(value, &prop[key_len + 1], value_len + 1); 1023 } 1024 1025 if (strcmp(key, "java.compiler") == 0) { 1026 process_java_compiler_argument(value); 1027 FreeHeap(key); 1028 if (eq != NULL) { 1029 FreeHeap(value); 1030 } 1031 return true; 1032 } else if (strcmp(key, "sun.java.command") == 0) { 1033 _java_command = value; 1034 1035 // Record value in Arguments, but let it get passed to Java. 1036 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1037 strcmp(key, "sun.java.launcher.pid") == 0) { 1038 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1039 // private and are processed in process_sun_java_launcher_properties(); 1040 // the sun.java.launcher property is passed on to the java application 1041 FreeHeap(key); 1042 if (eq != NULL) { 1043 FreeHeap(value); 1044 } 1045 return true; 1046 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1047 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1048 // its value without going through the property list or making a Java call. 1049 _java_vendor_url_bug = value; 1050 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1051 PropertyList_unique_add(&_system_properties, key, value, true); 1052 return true; 1053 } 1054 // Create new property and add at the end of the list 1055 PropertyList_unique_add(&_system_properties, key, value); 1056 return true; 1057 } 1058 1059 //=========================================================================================================== 1060 // Setting int/mixed/comp mode flags 1061 1062 void Arguments::set_mode_flags(Mode mode) { 1063 // Set up default values for all flags. 1064 // If you add a flag to any of the branches below, 1065 // add a default value for it here. 1066 set_java_compiler(false); 1067 _mode = mode; 1068 1069 // Ensure Agent_OnLoad has the correct initial values. 1070 // This may not be the final mode; mode may change later in onload phase. 1071 PropertyList_unique_add(&_system_properties, "java.vm.info", 1072 (char*)VM_Version::vm_info_string(), false); 1073 1074 UseInterpreter = true; 1075 UseCompiler = true; 1076 UseLoopCounter = true; 1077 1078 // Default values may be platform/compiler dependent - 1079 // use the saved values 1080 ClipInlining = Arguments::_ClipInlining; 1081 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1082 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1083 BackgroundCompilation = Arguments::_BackgroundCompilation; 1084 1085 // Change from defaults based on mode 1086 switch (mode) { 1087 default: 1088 ShouldNotReachHere(); 1089 break; 1090 case _int: 1091 UseCompiler = false; 1092 UseLoopCounter = false; 1093 AlwaysCompileLoopMethods = false; 1094 UseOnStackReplacement = false; 1095 break; 1096 case _mixed: 1097 // same as default 1098 break; 1099 case _comp: 1100 UseInterpreter = false; 1101 BackgroundCompilation = false; 1102 ClipInlining = false; 1103 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1104 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1105 // compile a level 4 (C2) and then continue executing it. 1106 if (TieredCompilation) { 1107 Tier3InvokeNotifyFreqLog = 0; 1108 Tier4InvocationThreshold = 0; 1109 } 1110 break; 1111 } 1112 } 1113 1114 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1115 // Conflict: required to use shared spaces (-Xshare:on), but 1116 // incompatible command line options were chosen. 1117 1118 static void no_shared_spaces(const char* message) { 1119 if (RequireSharedSpaces) { 1120 jio_fprintf(defaultStream::error_stream(), 1121 "Class data sharing is inconsistent with other specified options.\n"); 1122 vm_exit_during_initialization("Unable to use shared archive.", message); 1123 } else { 1124 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1125 } 1126 } 1127 #endif 1128 1129 // Returns threshold scaled with CompileThresholdScaling 1130 intx Arguments::get_scaled_compile_threshold(intx threshold) { 1131 return (intx)(threshold * CompileThresholdScaling); 1132 } 1133 1134 // Returns freq_log scaled with CompileThresholdScaling 1135 intx Arguments::get_scaled_freq_log(intx freq_log) { 1136 intx scaled_freq = get_scaled_compile_threshold((intx)1 << freq_log); 1137 if (scaled_freq == 0) { 1138 return 0; 1139 } else { 1140 return log2_intptr(scaled_freq); 1141 } 1142 } 1143 1144 void Arguments::set_tiered_flags() { 1145 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1146 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1147 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1148 } 1149 if (CompilationPolicyChoice < 2) { 1150 vm_exit_during_initialization( 1151 "Incompatible compilation policy selected", NULL); 1152 } 1153 // Increase the code cache size - tiered compiles a lot more. 1154 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1155 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, ReservedCodeCacheSize * 5); 1156 } 1157 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1158 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1159 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1160 1161 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1162 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1163 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1164 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1165 } 1166 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1167 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1168 } 1169 // Check consistency of code heap sizes 1170 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1171 jio_fprintf(defaultStream::error_stream(), 1172 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1173 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1174 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1175 vm_exit(1); 1176 } 1177 } 1178 } 1179 if (!UseInterpreter) { // -Xcomp 1180 Tier3InvokeNotifyFreqLog = 0; 1181 Tier4InvocationThreshold = 0; 1182 } 1183 // Scale tiered compilation thresholds 1184 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { 1185 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, get_scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1186 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, get_scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1187 1188 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, get_scaled_compile_threshold(Tier3InvocationThreshold)); 1189 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, get_scaled_compile_threshold(Tier3MinInvocationThreshold)); 1190 FLAG_SET_ERGO(intx, Tier3CompileThreshold, get_scaled_compile_threshold(Tier3CompileThreshold)); 1191 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, get_scaled_compile_threshold(Tier3BackEdgeThreshold)); 1192 1193 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1194 // once these thresholds become supported. 1195 1196 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, get_scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1197 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, get_scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1198 1199 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, get_scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1200 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, get_scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1201 1202 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, get_scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1203 1204 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, get_scaled_compile_threshold(Tier4InvocationThreshold)); 1205 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, get_scaled_compile_threshold(Tier4MinInvocationThreshold)); 1206 FLAG_SET_ERGO(intx, Tier4CompileThreshold, get_scaled_compile_threshold(Tier4CompileThreshold)); 1207 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, get_scaled_compile_threshold(Tier4BackEdgeThreshold)); 1208 } 1209 } 1210 1211 /** 1212 * Returns the minimum number of compiler threads needed to run the JVM. The following 1213 * configurations are possible. 1214 * 1215 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1216 * compiler threads is 0. 1217 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1218 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1219 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1220 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1221 * C1 can be used, so the minimum number of compiler threads is 1. 1222 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1223 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1224 * the minimum number of compiler threads is 2. 1225 */ 1226 int Arguments::get_min_number_of_compiler_threads() { 1227 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1228 return 0; // case 1 1229 #else 1230 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1231 return 1; // case 2 or case 3 1232 } 1233 return 2; // case 4 (tiered) 1234 #endif 1235 } 1236 1237 #if INCLUDE_ALL_GCS 1238 static void disable_adaptive_size_policy(const char* collector_name) { 1239 if (UseAdaptiveSizePolicy) { 1240 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1241 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1242 collector_name); 1243 } 1244 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1245 } 1246 } 1247 1248 void Arguments::set_parnew_gc_flags() { 1249 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1250 "control point invariant"); 1251 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1252 assert(UseParNewGC, "ParNew should always be used with CMS"); 1253 1254 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1255 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1256 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1257 } else if (ParallelGCThreads == 0) { 1258 jio_fprintf(defaultStream::error_stream(), 1259 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1260 vm_exit(1); 1261 } 1262 1263 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1264 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1265 // we set them to 1024 and 1024. 1266 // See CR 6362902. 1267 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1268 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1269 } 1270 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1271 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1272 } 1273 1274 // When using compressed oops, we use local overflow stacks, 1275 // rather than using a global overflow list chained through 1276 // the klass word of the object's pre-image. 1277 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1278 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1279 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1280 } 1281 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1282 } 1283 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1284 } 1285 1286 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1287 // sparc/solaris for certain applications, but would gain from 1288 // further optimization and tuning efforts, and would almost 1289 // certainly gain from analysis of platform and environment. 1290 void Arguments::set_cms_and_parnew_gc_flags() { 1291 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1292 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1293 assert(UseParNewGC, "ParNew should always be used with CMS"); 1294 1295 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1296 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1297 1298 set_parnew_gc_flags(); 1299 1300 size_t max_heap = align_size_down(MaxHeapSize, 1301 CardTableRS::ct_max_alignment_constraint()); 1302 1303 // Now make adjustments for CMS 1304 intx tenuring_default = (intx)6; 1305 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1306 1307 // Preferred young gen size for "short" pauses: 1308 // upper bound depends on # of threads and NewRatio. 1309 const uintx parallel_gc_threads = 1310 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1311 const size_t preferred_max_new_size_unaligned = 1312 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1313 size_t preferred_max_new_size = 1314 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1315 1316 // Unless explicitly requested otherwise, size young gen 1317 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1318 1319 // If either MaxNewSize or NewRatio is set on the command line, 1320 // assume the user is trying to set the size of the young gen. 1321 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1322 1323 // Set MaxNewSize to our calculated preferred_max_new_size unless 1324 // NewSize was set on the command line and it is larger than 1325 // preferred_max_new_size. 1326 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1327 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1328 } else { 1329 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1330 } 1331 if (PrintGCDetails && Verbose) { 1332 // Too early to use gclog_or_tty 1333 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1334 } 1335 1336 // Code along this path potentially sets NewSize and OldSize 1337 if (PrintGCDetails && Verbose) { 1338 // Too early to use gclog_or_tty 1339 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1340 " initial_heap_size: " SIZE_FORMAT 1341 " max_heap: " SIZE_FORMAT, 1342 min_heap_size(), InitialHeapSize, max_heap); 1343 } 1344 size_t min_new = preferred_max_new_size; 1345 if (FLAG_IS_CMDLINE(NewSize)) { 1346 min_new = NewSize; 1347 } 1348 if (max_heap > min_new && min_heap_size() > min_new) { 1349 // Unless explicitly requested otherwise, make young gen 1350 // at least min_new, and at most preferred_max_new_size. 1351 if (FLAG_IS_DEFAULT(NewSize)) { 1352 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1353 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1354 if (PrintGCDetails && Verbose) { 1355 // Too early to use gclog_or_tty 1356 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1357 } 1358 } 1359 // Unless explicitly requested otherwise, size old gen 1360 // so it's NewRatio x of NewSize. 1361 if (FLAG_IS_DEFAULT(OldSize)) { 1362 if (max_heap > NewSize) { 1363 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1364 if (PrintGCDetails && Verbose) { 1365 // Too early to use gclog_or_tty 1366 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1367 } 1368 } 1369 } 1370 } 1371 } 1372 // Unless explicitly requested otherwise, definitely 1373 // promote all objects surviving "tenuring_default" scavenges. 1374 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1375 FLAG_IS_DEFAULT(SurvivorRatio)) { 1376 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1377 } 1378 // If we decided above (or user explicitly requested) 1379 // `promote all' (via MaxTenuringThreshold := 0), 1380 // prefer minuscule survivor spaces so as not to waste 1381 // space for (non-existent) survivors 1382 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1383 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1384 } 1385 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1386 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1387 // This is done in order to make ParNew+CMS configuration to work 1388 // with YoungPLABSize and OldPLABSize options. 1389 // See CR 6362902. 1390 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1391 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1392 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1393 // is. In this situation let CMSParPromoteBlocksToClaim follow 1394 // the value (either from the command line or ergonomics) of 1395 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1396 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1397 } else { 1398 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1399 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1400 // we'll let it to take precedence. 1401 jio_fprintf(defaultStream::error_stream(), 1402 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1403 " options are specified for the CMS collector." 1404 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1405 } 1406 } 1407 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1408 // OldPLAB sizing manually turned off: Use a larger default setting, 1409 // unless it was manually specified. This is because a too-low value 1410 // will slow down scavenges. 1411 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1412 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1413 } 1414 } 1415 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1416 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1417 // If either of the static initialization defaults have changed, note this 1418 // modification. 1419 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1420 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1421 } 1422 if (PrintGCDetails && Verbose) { 1423 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1424 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1425 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1426 } 1427 } 1428 #endif // INCLUDE_ALL_GCS 1429 1430 void set_object_alignment() { 1431 // Object alignment. 1432 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1433 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1434 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1435 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1436 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1437 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1438 1439 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1440 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1441 1442 // Oop encoding heap max 1443 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1444 1445 #if INCLUDE_ALL_GCS 1446 // Set CMS global values 1447 CompactibleFreeListSpace::set_cms_values(); 1448 #endif // INCLUDE_ALL_GCS 1449 } 1450 1451 bool verify_object_alignment() { 1452 // Object alignment. 1453 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1454 jio_fprintf(defaultStream::error_stream(), 1455 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1456 (int)ObjectAlignmentInBytes); 1457 return false; 1458 } 1459 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1460 jio_fprintf(defaultStream::error_stream(), 1461 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1462 (int)ObjectAlignmentInBytes, BytesPerLong); 1463 return false; 1464 } 1465 // It does not make sense to have big object alignment 1466 // since a space lost due to alignment will be greater 1467 // then a saved space from compressed oops. 1468 if ((int)ObjectAlignmentInBytes > 256) { 1469 jio_fprintf(defaultStream::error_stream(), 1470 "error: ObjectAlignmentInBytes=%d must not be greater than 256\n", 1471 (int)ObjectAlignmentInBytes); 1472 return false; 1473 } 1474 // In case page size is very small. 1475 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1476 jio_fprintf(defaultStream::error_stream(), 1477 "error: ObjectAlignmentInBytes=%d must be less than page size %d\n", 1478 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1479 return false; 1480 } 1481 if(SurvivorAlignmentInBytes == 0) { 1482 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1483 } else { 1484 if (!is_power_of_2(SurvivorAlignmentInBytes)) { 1485 jio_fprintf(defaultStream::error_stream(), 1486 "error: SurvivorAlignmentInBytes=%d must be power of 2\n", 1487 (int)SurvivorAlignmentInBytes); 1488 return false; 1489 } 1490 if (SurvivorAlignmentInBytes < ObjectAlignmentInBytes) { 1491 jio_fprintf(defaultStream::error_stream(), 1492 "error: SurvivorAlignmentInBytes=%d must be greater than ObjectAlignmentInBytes=%d \n", 1493 (int)SurvivorAlignmentInBytes, (int)ObjectAlignmentInBytes); 1494 return false; 1495 } 1496 } 1497 return true; 1498 } 1499 1500 size_t Arguments::max_heap_for_compressed_oops() { 1501 // Avoid sign flip. 1502 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1503 // We need to fit both the NULL page and the heap into the memory budget, while 1504 // keeping alignment constraints of the heap. To guarantee the latter, as the 1505 // NULL page is located before the heap, we pad the NULL page to the conservative 1506 // maximum alignment that the GC may ever impose upon the heap. 1507 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1508 _conservative_max_heap_alignment); 1509 1510 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1511 NOT_LP64(ShouldNotReachHere(); return 0); 1512 } 1513 1514 bool Arguments::should_auto_select_low_pause_collector() { 1515 if (UseAutoGCSelectPolicy && 1516 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1517 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1518 if (PrintGCDetails) { 1519 // Cannot use gclog_or_tty yet. 1520 tty->print_cr("Automatic selection of the low pause collector" 1521 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1522 } 1523 return true; 1524 } 1525 return false; 1526 } 1527 1528 void Arguments::set_use_compressed_oops() { 1529 #ifndef ZERO 1530 #ifdef _LP64 1531 // MaxHeapSize is not set up properly at this point, but 1532 // the only value that can override MaxHeapSize if we are 1533 // to use UseCompressedOops is InitialHeapSize. 1534 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1535 1536 if (max_heap_size <= max_heap_for_compressed_oops()) { 1537 #if !defined(COMPILER1) || defined(TIERED) 1538 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1539 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1540 } 1541 #endif 1542 #ifdef _WIN64 1543 if (UseLargePages && UseCompressedOops) { 1544 // Cannot allocate guard pages for implicit checks in indexed addressing 1545 // mode, when large pages are specified on windows. 1546 // This flag could be switched ON if narrow oop base address is set to 0, 1547 // see code in Universe::initialize_heap(). 1548 Universe::set_narrow_oop_use_implicit_null_checks(false); 1549 } 1550 #endif // _WIN64 1551 } else { 1552 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1553 warning("Max heap size too large for Compressed Oops"); 1554 FLAG_SET_DEFAULT(UseCompressedOops, false); 1555 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1556 } 1557 } 1558 #endif // _LP64 1559 #endif // ZERO 1560 } 1561 1562 1563 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1564 // set_use_compressed_oops(). 1565 void Arguments::set_use_compressed_klass_ptrs() { 1566 #ifndef ZERO 1567 #ifdef _LP64 1568 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1569 if (!UseCompressedOops) { 1570 if (UseCompressedClassPointers) { 1571 warning("UseCompressedClassPointers requires UseCompressedOops"); 1572 } 1573 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1574 } else { 1575 // Turn on UseCompressedClassPointers too 1576 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1577 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1578 } 1579 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1580 if (UseCompressedClassPointers) { 1581 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1582 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1583 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1584 } 1585 } 1586 } 1587 #endif // _LP64 1588 #endif // !ZERO 1589 } 1590 1591 void Arguments::set_conservative_max_heap_alignment() { 1592 // The conservative maximum required alignment for the heap is the maximum of 1593 // the alignments imposed by several sources: any requirements from the heap 1594 // itself, the collector policy and the maximum page size we may run the VM 1595 // with. 1596 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1597 #if INCLUDE_ALL_GCS 1598 if (UseParallelGC) { 1599 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1600 } else if (UseG1GC) { 1601 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1602 } 1603 #endif // INCLUDE_ALL_GCS 1604 _conservative_max_heap_alignment = MAX4(heap_alignment, 1605 (size_t)os::vm_allocation_granularity(), 1606 os::max_page_size(), 1607 CollectorPolicy::compute_heap_alignment()); 1608 } 1609 1610 void Arguments::select_gc_ergonomically() { 1611 if (os::is_server_class_machine()) { 1612 if (should_auto_select_low_pause_collector()) { 1613 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1614 } else { 1615 FLAG_SET_ERGO(bool, UseParallelGC, true); 1616 } 1617 } 1618 } 1619 1620 void Arguments::select_gc() { 1621 if (!gc_selected()) { 1622 ArgumentsExt::select_gc_ergonomically(); 1623 } 1624 } 1625 1626 void Arguments::set_ergonomics_flags() { 1627 select_gc(); 1628 1629 #ifdef COMPILER2 1630 // Shared spaces work fine with other GCs but causes bytecode rewriting 1631 // to be disabled, which hurts interpreter performance and decreases 1632 // server performance. When -server is specified, keep the default off 1633 // unless it is asked for. Future work: either add bytecode rewriting 1634 // at link time, or rewrite bytecodes in non-shared methods. 1635 if (!DumpSharedSpaces && !RequireSharedSpaces && 1636 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1637 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1638 } 1639 #endif 1640 1641 set_conservative_max_heap_alignment(); 1642 1643 #ifndef ZERO 1644 #ifdef _LP64 1645 set_use_compressed_oops(); 1646 1647 // set_use_compressed_klass_ptrs() must be called after calling 1648 // set_use_compressed_oops(). 1649 set_use_compressed_klass_ptrs(); 1650 1651 // Also checks that certain machines are slower with compressed oops 1652 // in vm_version initialization code. 1653 #endif // _LP64 1654 #endif // !ZERO 1655 } 1656 1657 void Arguments::set_parallel_gc_flags() { 1658 assert(UseParallelGC || UseParallelOldGC, "Error"); 1659 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1660 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1661 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1662 } 1663 FLAG_SET_DEFAULT(UseParallelGC, true); 1664 1665 // If no heap maximum was requested explicitly, use some reasonable fraction 1666 // of the physical memory, up to a maximum of 1GB. 1667 FLAG_SET_DEFAULT(ParallelGCThreads, 1668 Abstract_VM_Version::parallel_worker_threads()); 1669 if (ParallelGCThreads == 0) { 1670 jio_fprintf(defaultStream::error_stream(), 1671 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1672 vm_exit(1); 1673 } 1674 1675 if (UseAdaptiveSizePolicy) { 1676 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1677 // unless the user actually sets these flags. 1678 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1679 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1680 _min_heap_free_ratio = MinHeapFreeRatio; 1681 } 1682 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1683 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1684 _max_heap_free_ratio = MaxHeapFreeRatio; 1685 } 1686 } 1687 1688 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1689 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1690 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1691 // See CR 6362902 for details. 1692 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1693 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1694 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1695 } 1696 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1697 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1698 } 1699 } 1700 1701 if (UseParallelOldGC) { 1702 // Par compact uses lower default values since they are treated as 1703 // minimums. These are different defaults because of the different 1704 // interpretation and are not ergonomically set. 1705 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1706 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1707 } 1708 } 1709 } 1710 1711 void Arguments::set_g1_gc_flags() { 1712 assert(UseG1GC, "Error"); 1713 #ifdef COMPILER1 1714 FastTLABRefill = false; 1715 #endif 1716 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1717 if (ParallelGCThreads == 0) { 1718 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1719 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1720 } 1721 1722 #if INCLUDE_ALL_GCS 1723 if (G1ConcRefinementThreads == 0) { 1724 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1725 } 1726 #endif 1727 1728 // MarkStackSize will be set (if it hasn't been set by the user) 1729 // when concurrent marking is initialized. 1730 // Its value will be based upon the number of parallel marking threads. 1731 // But we do set the maximum mark stack size here. 1732 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1733 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1734 } 1735 1736 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1737 // In G1, we want the default GC overhead goal to be higher than 1738 // say in PS. So we set it here to 10%. Otherwise the heap might 1739 // be expanded more aggressively than we would like it to. In 1740 // fact, even 10% seems to not be high enough in some cases 1741 // (especially small GC stress tests that the main thing they do 1742 // is allocation). We might consider increase it further. 1743 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1744 } 1745 1746 if (PrintGCDetails && Verbose) { 1747 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1748 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1749 tty->print_cr("ConcGCThreads: %u", (uint) ConcGCThreads); 1750 } 1751 } 1752 1753 #if !INCLUDE_ALL_GCS 1754 #ifdef ASSERT 1755 static bool verify_serial_gc_flags() { 1756 return (UseSerialGC && 1757 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1758 UseParallelGC || UseParallelOldGC)); 1759 } 1760 #endif // ASSERT 1761 #endif // INCLUDE_ALL_GCS 1762 1763 void Arguments::set_gc_specific_flags() { 1764 #if INCLUDE_ALL_GCS 1765 // Set per-collector flags 1766 if (UseParallelGC || UseParallelOldGC) { 1767 set_parallel_gc_flags(); 1768 } else if (UseConcMarkSweepGC) { 1769 set_cms_and_parnew_gc_flags(); 1770 } else if (UseG1GC) { 1771 set_g1_gc_flags(); 1772 } 1773 check_deprecated_gc_flags(); 1774 if (AssumeMP && !UseSerialGC) { 1775 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1776 warning("If the number of processors is expected to increase from one, then" 1777 " you should configure the number of parallel GC threads appropriately" 1778 " using -XX:ParallelGCThreads=N"); 1779 } 1780 } 1781 if (MinHeapFreeRatio == 100) { 1782 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1783 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1784 } 1785 #else // INCLUDE_ALL_GCS 1786 assert(verify_serial_gc_flags(), "SerialGC unset"); 1787 #endif // INCLUDE_ALL_GCS 1788 } 1789 1790 julong Arguments::limit_by_allocatable_memory(julong limit) { 1791 julong max_allocatable; 1792 julong result = limit; 1793 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1794 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1795 } 1796 return result; 1797 } 1798 1799 // Use static initialization to get the default before parsing 1800 static const uintx DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1801 1802 void Arguments::set_heap_size() { 1803 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1804 // Deprecated flag 1805 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1806 } 1807 1808 const julong phys_mem = 1809 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1810 : (julong)MaxRAM; 1811 1812 // If the maximum heap size has not been set with -Xmx, 1813 // then set it as fraction of the size of physical memory, 1814 // respecting the maximum and minimum sizes of the heap. 1815 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1816 julong reasonable_max = phys_mem / MaxRAMFraction; 1817 1818 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1819 // Small physical memory, so use a minimum fraction of it for the heap 1820 reasonable_max = phys_mem / MinRAMFraction; 1821 } else { 1822 // Not-small physical memory, so require a heap at least 1823 // as large as MaxHeapSize 1824 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1825 } 1826 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1827 // Limit the heap size to ErgoHeapSizeLimit 1828 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1829 } 1830 if (UseCompressedOops) { 1831 // Limit the heap size to the maximum possible when using compressed oops 1832 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1833 1834 // HeapBaseMinAddress can be greater than default but not less than. 1835 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1836 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1837 // matches compressed oops printing flags 1838 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1839 jio_fprintf(defaultStream::error_stream(), 1840 "HeapBaseMinAddress must be at least " UINTX_FORMAT 1841 " (" UINTX_FORMAT "G) which is greater than value given " 1842 UINTX_FORMAT "\n", 1843 DefaultHeapBaseMinAddress, 1844 DefaultHeapBaseMinAddress/G, 1845 HeapBaseMinAddress); 1846 } 1847 FLAG_SET_ERGO(uintx, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1848 } 1849 } 1850 1851 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1852 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1853 // but it should be not less than default MaxHeapSize. 1854 max_coop_heap -= HeapBaseMinAddress; 1855 } 1856 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1857 } 1858 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1859 1860 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1861 // An initial heap size was specified on the command line, 1862 // so be sure that the maximum size is consistent. Done 1863 // after call to limit_by_allocatable_memory because that 1864 // method might reduce the allocation size. 1865 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1866 } 1867 1868 if (PrintGCDetails && Verbose) { 1869 // Cannot use gclog_or_tty yet. 1870 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1871 } 1872 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1873 } 1874 1875 // If the minimum or initial heap_size have not been set or requested to be set 1876 // ergonomically, set them accordingly. 1877 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1878 julong reasonable_minimum = (julong)(OldSize + NewSize); 1879 1880 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1881 1882 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1883 1884 if (InitialHeapSize == 0) { 1885 julong reasonable_initial = phys_mem / InitialRAMFraction; 1886 1887 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1888 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1889 1890 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1891 1892 if (PrintGCDetails && Verbose) { 1893 // Cannot use gclog_or_tty yet. 1894 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1895 } 1896 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1897 } 1898 // If the minimum heap size has not been set (via -Xms), 1899 // synchronize with InitialHeapSize to avoid errors with the default value. 1900 if (min_heap_size() == 0) { 1901 set_min_heap_size(MIN2((uintx)reasonable_minimum, InitialHeapSize)); 1902 if (PrintGCDetails && Verbose) { 1903 // Cannot use gclog_or_tty yet. 1904 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1905 } 1906 } 1907 } 1908 } 1909 1910 // This must be called after ergonomics because we want bytecode rewriting 1911 // if the server compiler is used, or if UseSharedSpaces is disabled. 1912 void Arguments::set_bytecode_flags() { 1913 // Better not attempt to store into a read-only space. 1914 if (UseSharedSpaces) { 1915 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1916 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1917 } 1918 1919 if (!RewriteBytecodes) { 1920 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1921 } 1922 } 1923 1924 // Aggressive optimization flags -XX:+AggressiveOpts 1925 void Arguments::set_aggressive_opts_flags() { 1926 #ifdef COMPILER2 1927 if (AggressiveUnboxing) { 1928 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1929 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1930 } else if (!EliminateAutoBox) { 1931 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1932 AggressiveUnboxing = false; 1933 } 1934 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1935 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1936 } else if (!DoEscapeAnalysis) { 1937 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1938 AggressiveUnboxing = false; 1939 } 1940 } 1941 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1942 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1943 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1944 } 1945 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1946 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1947 } 1948 1949 // Feed the cache size setting into the JDK 1950 char buffer[1024]; 1951 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1952 add_property(buffer); 1953 } 1954 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1955 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1956 } 1957 #endif 1958 1959 if (AggressiveOpts) { 1960 // Sample flag setting code 1961 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1962 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1963 // } 1964 } 1965 } 1966 1967 //=========================================================================================================== 1968 // Parsing of java.compiler property 1969 1970 void Arguments::process_java_compiler_argument(char* arg) { 1971 // For backwards compatibility, Djava.compiler=NONE or "" 1972 // causes us to switch to -Xint mode UNLESS -Xdebug 1973 // is also specified. 1974 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1975 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1976 } 1977 } 1978 1979 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1980 _sun_java_launcher = os::strdup_check_oom(launcher); 1981 } 1982 1983 bool Arguments::created_by_java_launcher() { 1984 assert(_sun_java_launcher != NULL, "property must have value"); 1985 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1986 } 1987 1988 bool Arguments::sun_java_launcher_is_altjvm() { 1989 return _sun_java_launcher_is_altjvm; 1990 } 1991 1992 //=========================================================================================================== 1993 // Parsing of main arguments 1994 1995 bool Arguments::verify_interval(uintx val, uintx min, 1996 uintx max, const char* name) { 1997 // Returns true iff value is in the inclusive interval [min..max] 1998 // false, otherwise. 1999 if (val >= min && val <= max) { 2000 return true; 2001 } 2002 jio_fprintf(defaultStream::error_stream(), 2003 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 2004 " and " UINTX_FORMAT "\n", 2005 name, val, min, max); 2006 return false; 2007 } 2008 2009 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 2010 // Returns true if given value is at least specified min threshold 2011 // false, otherwise. 2012 if (val >= min ) { 2013 return true; 2014 } 2015 jio_fprintf(defaultStream::error_stream(), 2016 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 2017 name, val, min); 2018 return false; 2019 } 2020 2021 bool Arguments::verify_percentage(uintx value, const char* name) { 2022 if (is_percentage(value)) { 2023 return true; 2024 } 2025 jio_fprintf(defaultStream::error_stream(), 2026 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 2027 name, value); 2028 return false; 2029 } 2030 2031 // check if do gclog rotation 2032 // +UseGCLogFileRotation is a must, 2033 // no gc log rotation when log file not supplied or 2034 // NumberOfGCLogFiles is 0 2035 void check_gclog_consistency() { 2036 if (UseGCLogFileRotation) { 2037 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 2038 jio_fprintf(defaultStream::output_stream(), 2039 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 2040 "where num_of_file > 0\n" 2041 "GC log rotation is turned off\n"); 2042 UseGCLogFileRotation = false; 2043 } 2044 } 2045 2046 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 2047 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 2048 jio_fprintf(defaultStream::output_stream(), 2049 "GCLogFileSize changed to minimum 8K\n"); 2050 } 2051 } 2052 2053 // This function is called for -Xloggc:<filename>, it can be used 2054 // to check if a given file name(or string) conforms to the following 2055 // specification: 2056 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 2057 // %p and %t only allowed once. We only limit usage of filename not path 2058 bool is_filename_valid(const char *file_name) { 2059 const char* p = file_name; 2060 char file_sep = os::file_separator()[0]; 2061 const char* cp; 2062 // skip prefix path 2063 for (cp = file_name; *cp != '\0'; cp++) { 2064 if (*cp == '/' || *cp == file_sep) { 2065 p = cp + 1; 2066 } 2067 } 2068 2069 int count_p = 0; 2070 int count_t = 0; 2071 while (*p != '\0') { 2072 if ((*p >= '0' && *p <= '9') || 2073 (*p >= 'A' && *p <= 'Z') || 2074 (*p >= 'a' && *p <= 'z') || 2075 *p == '-' || 2076 *p == '_' || 2077 *p == '.') { 2078 p++; 2079 continue; 2080 } 2081 if (*p == '%') { 2082 if(*(p + 1) == 'p') { 2083 p += 2; 2084 count_p ++; 2085 continue; 2086 } 2087 if (*(p + 1) == 't') { 2088 p += 2; 2089 count_t ++; 2090 continue; 2091 } 2092 } 2093 return false; 2094 } 2095 return count_p < 2 && count_t < 2; 2096 } 2097 2098 bool Arguments::verify_MinHeapFreeRatio(FormatBuffer<80>& err_msg, uintx min_heap_free_ratio) { 2099 if (!is_percentage(min_heap_free_ratio)) { 2100 err_msg.print("MinHeapFreeRatio must have a value between 0 and 100"); 2101 return false; 2102 } 2103 if (min_heap_free_ratio > MaxHeapFreeRatio) { 2104 err_msg.print("MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 2105 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")", min_heap_free_ratio, 2106 MaxHeapFreeRatio); 2107 return false; 2108 } 2109 // This does not set the flag itself, but stores the value in a safe place for later usage. 2110 _min_heap_free_ratio = min_heap_free_ratio; 2111 return true; 2112 } 2113 2114 bool Arguments::verify_MaxHeapFreeRatio(FormatBuffer<80>& err_msg, uintx max_heap_free_ratio) { 2115 if (!is_percentage(max_heap_free_ratio)) { 2116 err_msg.print("MaxHeapFreeRatio must have a value between 0 and 100"); 2117 return false; 2118 } 2119 if (max_heap_free_ratio < MinHeapFreeRatio) { 2120 err_msg.print("MaxHeapFreeRatio (" UINTX_FORMAT ") must be greater than or " 2121 "equal to MinHeapFreeRatio (" UINTX_FORMAT ")", max_heap_free_ratio, 2122 MinHeapFreeRatio); 2123 return false; 2124 } 2125 // This does not set the flag itself, but stores the value in a safe place for later usage. 2126 _max_heap_free_ratio = max_heap_free_ratio; 2127 return true; 2128 } 2129 2130 // Check consistency of GC selection 2131 bool Arguments::check_gc_consistency_user() { 2132 check_gclog_consistency(); 2133 // Ensure that the user has not selected conflicting sets 2134 // of collectors. 2135 uint i = 0; 2136 if (UseSerialGC) i++; 2137 if (UseConcMarkSweepGC) i++; 2138 if (UseParallelGC || UseParallelOldGC) i++; 2139 if (UseG1GC) i++; 2140 if (i > 1) { 2141 jio_fprintf(defaultStream::error_stream(), 2142 "Conflicting collector combinations in option list; " 2143 "please refer to the release notes for the combinations " 2144 "allowed\n"); 2145 return false; 2146 } 2147 2148 if (UseConcMarkSweepGC && !UseParNewGC) { 2149 jio_fprintf(defaultStream::error_stream(), 2150 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2151 return false; 2152 } 2153 2154 if (UseParNewGC && !UseConcMarkSweepGC) { 2155 // !UseConcMarkSweepGC means that we are using serial old gc. Unfortunately we don't 2156 // set up UseSerialGC properly, so that can't be used in the check here. 2157 jio_fprintf(defaultStream::error_stream(), 2158 "It is not possible to combine the ParNew young collector with the Serial old collector.\n"); 2159 return false; 2160 } 2161 2162 return true; 2163 } 2164 2165 void Arguments::check_deprecated_gc_flags() { 2166 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2167 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2168 } 2169 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2170 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2171 "and will likely be removed in future release"); 2172 } 2173 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2174 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2175 "Use MaxRAMFraction instead."); 2176 } 2177 } 2178 2179 // Check stack pages settings 2180 bool Arguments::check_stack_pages() 2181 { 2182 bool status = true; 2183 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 2184 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 2185 // greater stack shadow pages can't generate instruction to bang stack 2186 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 2187 return status; 2188 } 2189 2190 // Check the consistency of vm_init_args 2191 bool Arguments::check_vm_args_consistency() { 2192 // Method for adding checks for flag consistency. 2193 // The intent is to warn the user of all possible conflicts, 2194 // before returning an error. 2195 // Note: Needs platform-dependent factoring. 2196 bool status = true; 2197 2198 if (TLABRefillWasteFraction == 0) { 2199 jio_fprintf(defaultStream::error_stream(), 2200 "TLABRefillWasteFraction should be a denominator, " 2201 "not " SIZE_FORMAT "\n", 2202 TLABRefillWasteFraction); 2203 status = false; 2204 } 2205 2206 status = status && verify_interval(AdaptiveSizePolicyWeight, 0, 100, 2207 "AdaptiveSizePolicyWeight"); 2208 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 2209 2210 // Divide by bucket size to prevent a large size from causing rollover when 2211 // calculating amount of memory needed to be allocated for the String table. 2212 status = status && verify_interval(StringTableSize, minimumStringTableSize, 2213 (max_uintx / StringTable::bucket_size()), "StringTable size"); 2214 2215 status = status && verify_interval(SymbolTableSize, minimumSymbolTableSize, 2216 (max_uintx / SymbolTable::bucket_size()), "SymbolTable size"); 2217 2218 { 2219 // Using "else if" below to avoid printing two error messages if min > max. 2220 // This will also prevent us from reporting both min>100 and max>100 at the 2221 // same time, but that is less annoying than printing two identical errors IMHO. 2222 FormatBuffer<80> err_msg("%s",""); 2223 if (!verify_MinHeapFreeRatio(err_msg, MinHeapFreeRatio)) { 2224 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2225 status = false; 2226 } else if (!verify_MaxHeapFreeRatio(err_msg, MaxHeapFreeRatio)) { 2227 jio_fprintf(defaultStream::error_stream(), "%s\n", err_msg.buffer()); 2228 status = false; 2229 } 2230 } 2231 2232 // Min/MaxMetaspaceFreeRatio 2233 status = status && verify_percentage(MinMetaspaceFreeRatio, "MinMetaspaceFreeRatio"); 2234 status = status && verify_percentage(MaxMetaspaceFreeRatio, "MaxMetaspaceFreeRatio"); 2235 2236 if (MinMetaspaceFreeRatio > MaxMetaspaceFreeRatio) { 2237 jio_fprintf(defaultStream::error_stream(), 2238 "MinMetaspaceFreeRatio (%s" UINTX_FORMAT ") must be less than or " 2239 "equal to MaxMetaspaceFreeRatio (%s" UINTX_FORMAT ")\n", 2240 FLAG_IS_DEFAULT(MinMetaspaceFreeRatio) ? "Default: " : "", 2241 MinMetaspaceFreeRatio, 2242 FLAG_IS_DEFAULT(MaxMetaspaceFreeRatio) ? "Default: " : "", 2243 MaxMetaspaceFreeRatio); 2244 status = false; 2245 } 2246 2247 // Trying to keep 100% free is not practical 2248 MinMetaspaceFreeRatio = MIN2(MinMetaspaceFreeRatio, (uintx) 99); 2249 2250 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2251 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2252 } 2253 2254 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2255 // Settings to encourage splitting. 2256 if (!FLAG_IS_CMDLINE(NewRatio)) { 2257 FLAG_SET_CMDLINE(uintx, NewRatio, 2); 2258 } 2259 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2260 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2261 } 2262 } 2263 2264 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2265 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2266 } 2267 2268 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 2269 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 2270 if (GCTimeLimit == 100) { 2271 // Turn off gc-overhead-limit-exceeded checks 2272 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2273 } 2274 2275 status = status && check_gc_consistency_user(); 2276 status = status && check_stack_pages(); 2277 2278 status = status && verify_percentage(CMSIncrementalSafetyFactor, 2279 "CMSIncrementalSafetyFactor"); 2280 2281 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2282 // insists that we hold the requisite locks so that the iteration is 2283 // MT-safe. For the verification at start-up and shut-down, we don't 2284 // yet have a good way of acquiring and releasing these locks, 2285 // which are not visible at the CollectedHeap level. We want to 2286 // be able to acquire these locks and then do the iteration rather 2287 // than just disable the lock verification. This will be fixed under 2288 // bug 4788986. 2289 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2290 if (VerifyDuringStartup) { 2291 warning("Heap verification at start-up disabled " 2292 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2293 VerifyDuringStartup = false; // Disable verification at start-up 2294 } 2295 2296 if (VerifyBeforeExit) { 2297 warning("Heap verification at shutdown disabled " 2298 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2299 VerifyBeforeExit = false; // Disable verification at shutdown 2300 } 2301 } 2302 2303 // Note: only executed in non-PRODUCT mode 2304 if (!UseAsyncConcMarkSweepGC && 2305 (ExplicitGCInvokesConcurrent || 2306 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2307 jio_fprintf(defaultStream::error_stream(), 2308 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2309 " with -UseAsyncConcMarkSweepGC"); 2310 status = false; 2311 } 2312 2313 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 2314 2315 #if INCLUDE_ALL_GCS 2316 if (UseG1GC) { 2317 status = status && verify_percentage(G1NewSizePercent, "G1NewSizePercent"); 2318 status = status && verify_percentage(G1MaxNewSizePercent, "G1MaxNewSizePercent"); 2319 status = status && verify_interval(G1NewSizePercent, 0, G1MaxNewSizePercent, "G1NewSizePercent"); 2320 2321 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 2322 "InitiatingHeapOccupancyPercent"); 2323 status = status && verify_min_value(G1RefProcDrainInterval, 1, 2324 "G1RefProcDrainInterval"); 2325 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 2326 "G1ConcMarkStepDurationMillis"); 2327 status = status && verify_interval(G1ConcRSHotCardLimit, 0, max_jubyte, 2328 "G1ConcRSHotCardLimit"); 2329 status = status && verify_interval(G1ConcRSLogCacheSize, 0, 31, 2330 "G1ConcRSLogCacheSize"); 2331 status = status && verify_interval(StringDeduplicationAgeThreshold, 1, markOopDesc::max_age, 2332 "StringDeduplicationAgeThreshold"); 2333 } 2334 if (UseConcMarkSweepGC) { 2335 status = status && verify_min_value(CMSOldPLABNumRefills, 1, "CMSOldPLABNumRefills"); 2336 status = status && verify_min_value(CMSOldPLABToleranceFactor, 1, "CMSOldPLABToleranceFactor"); 2337 status = status && verify_min_value(CMSOldPLABMax, 1, "CMSOldPLABMax"); 2338 status = status && verify_interval(CMSOldPLABMin, 1, CMSOldPLABMax, "CMSOldPLABMin"); 2339 2340 status = status && verify_min_value(CMSYoungGenPerWorker, 1, "CMSYoungGenPerWorker"); 2341 2342 status = status && verify_min_value(CMSSamplingGrain, 1, "CMSSamplingGrain"); 2343 status = status && verify_interval(CMS_SweepWeight, 0, 100, "CMS_SweepWeight"); 2344 status = status && verify_interval(CMS_FLSWeight, 0, 100, "CMS_FLSWeight"); 2345 2346 status = status && verify_interval(FLSCoalescePolicy, 0, 4, "FLSCoalescePolicy"); 2347 2348 status = status && verify_min_value(CMSRescanMultiple, 1, "CMSRescanMultiple"); 2349 status = status && verify_min_value(CMSConcMarkMultiple, 1, "CMSConcMarkMultiple"); 2350 2351 status = status && verify_interval(CMSPrecleanIter, 0, 9, "CMSPrecleanIter"); 2352 status = status && verify_min_value(CMSPrecleanDenominator, 1, "CMSPrecleanDenominator"); 2353 status = status && verify_interval(CMSPrecleanNumerator, 0, CMSPrecleanDenominator - 1, "CMSPrecleanNumerator"); 2354 2355 status = status && verify_percentage(CMSBootstrapOccupancy, "CMSBootstrapOccupancy"); 2356 2357 status = status && verify_min_value(CMSPrecleanThreshold, 100, "CMSPrecleanThreshold"); 2358 2359 status = status && verify_percentage(CMSScheduleRemarkEdenPenetration, "CMSScheduleRemarkEdenPenetration"); 2360 status = status && verify_min_value(CMSScheduleRemarkSamplingRatio, 1, "CMSScheduleRemarkSamplingRatio"); 2361 status = status && verify_min_value(CMSBitMapYieldQuantum, 1, "CMSBitMapYieldQuantum"); 2362 status = status && verify_percentage(CMSTriggerRatio, "CMSTriggerRatio"); 2363 status = status && verify_percentage(CMSIsTooFullPercentage, "CMSIsTooFullPercentage"); 2364 } 2365 2366 if (UseParallelGC || UseParallelOldGC) { 2367 status = status && verify_interval(ParallelOldDeadWoodLimiterMean, 0, 100, "ParallelOldDeadWoodLimiterMean"); 2368 status = status && verify_interval(ParallelOldDeadWoodLimiterStdDev, 0, 100, "ParallelOldDeadWoodLimiterStdDev"); 2369 2370 status = status && verify_percentage(YoungGenerationSizeIncrement, "YoungGenerationSizeIncrement"); 2371 status = status && verify_percentage(TenuredGenerationSizeIncrement, "TenuredGenerationSizeIncrement"); 2372 2373 status = status && verify_min_value(YoungGenerationSizeSupplementDecay, 1, "YoungGenerationSizeSupplementDecay"); 2374 status = status && verify_min_value(TenuredGenerationSizeSupplementDecay, 1, "TenuredGenerationSizeSupplementDecay"); 2375 2376 status = status && verify_min_value(ParGCCardsPerStrideChunk, 1, "ParGCCardsPerStrideChunk"); 2377 2378 status = status && verify_min_value(ParallelOldGCSplitInterval, 0, "ParallelOldGCSplitInterval"); 2379 } 2380 #endif // INCLUDE_ALL_GCS 2381 2382 status = status && verify_interval(RefDiscoveryPolicy, 2383 ReferenceProcessor::DiscoveryPolicyMin, 2384 ReferenceProcessor::DiscoveryPolicyMax, 2385 "RefDiscoveryPolicy"); 2386 2387 // Limit the lower bound of this flag to 1 as it is used in a division 2388 // expression. 2389 status = status && verify_interval(TLABWasteTargetPercent, 2390 1, 100, "TLABWasteTargetPercent"); 2391 2392 status = status && verify_object_alignment(); 2393 2394 status = status && verify_interval(CompressedClassSpaceSize, 1*M, 3*G, 2395 "CompressedClassSpaceSize"); 2396 2397 status = status && verify_interval(MarkStackSizeMax, 2398 1, (max_jint - 1), "MarkStackSizeMax"); 2399 status = status && verify_interval(NUMAChunkResizeWeight, 0, 100, "NUMAChunkResizeWeight"); 2400 2401 status = status && verify_min_value(LogEventsBufferEntries, 1, "LogEventsBufferEntries"); 2402 2403 status = status && verify_min_value(HeapSizePerGCThread, (uintx) os::vm_page_size(), "HeapSizePerGCThread"); 2404 2405 status = status && verify_min_value(GCTaskTimeStampEntries, 1, "GCTaskTimeStampEntries"); 2406 2407 status = status && verify_percentage(ParallelGCBufferWastePct, "ParallelGCBufferWastePct"); 2408 status = status && verify_interval(TargetPLABWastePct, 1, 100, "TargetPLABWastePct"); 2409 2410 status = status && verify_min_value(ParGCStridesPerThread, 1, "ParGCStridesPerThread"); 2411 2412 status = status && verify_min_value(MinRAMFraction, 1, "MinRAMFraction"); 2413 status = status && verify_min_value(InitialRAMFraction, 1, "InitialRAMFraction"); 2414 status = status && verify_min_value(MaxRAMFraction, 1, "MaxRAMFraction"); 2415 status = status && verify_min_value(DefaultMaxRAMFraction, 1, "DefaultMaxRAMFraction"); 2416 2417 status = status && verify_interval(AdaptiveTimeWeight, 0, 100, "AdaptiveTimeWeight"); 2418 status = status && verify_min_value(AdaptiveSizeDecrementScaleFactor, 1, "AdaptiveSizeDecrementScaleFactor"); 2419 2420 status = status && verify_interval(TLABAllocationWeight, 0, 100, "TLABAllocationWeight"); 2421 status = status && verify_min_value(MinTLABSize, 1, "MinTLABSize"); 2422 status = status && verify_min_value(TLABRefillWasteFraction, 1, "TLABRefillWasteFraction"); 2423 2424 status = status && verify_percentage(YoungGenerationSizeSupplement, "YoungGenerationSizeSupplement"); 2425 status = status && verify_percentage(TenuredGenerationSizeSupplement, "TenuredGenerationSizeSupplement"); 2426 2427 status = status && verify_interval(MaxTenuringThreshold, 0, markOopDesc::max_age + 1, "MaxTenuringThreshold"); 2428 status = status && verify_interval(InitialTenuringThreshold, 0, MaxTenuringThreshold, "InitialTenuringThreshold"); 2429 status = status && verify_percentage(TargetSurvivorRatio, "TargetSurvivorRatio"); 2430 status = status && verify_percentage(MarkSweepDeadRatio, "MarkSweepDeadRatio"); 2431 2432 status = status && verify_min_value(MarkSweepAlwaysCompactCount, 1, "MarkSweepAlwaysCompactCount"); 2433 #ifdef COMPILER1 2434 status = status && verify_min_value(ValueMapInitialSize, 1, "ValueMapInitialSize"); 2435 #endif 2436 2437 if (PrintNMTStatistics) { 2438 #if INCLUDE_NMT 2439 if (MemTracker::tracking_level() == NMT_off) { 2440 #endif // INCLUDE_NMT 2441 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2442 PrintNMTStatistics = false; 2443 #if INCLUDE_NMT 2444 } 2445 #endif 2446 } 2447 2448 // Need to limit the extent of the padding to reasonable size. 2449 // 8K is well beyond the reasonable HW cache line size, even with the 2450 // aggressive prefetching, while still leaving the room for segregating 2451 // among the distinct pages. 2452 if (ContendedPaddingWidth < 0 || ContendedPaddingWidth > 8192) { 2453 jio_fprintf(defaultStream::error_stream(), 2454 "ContendedPaddingWidth=" INTX_FORMAT " must be in between %d and %d\n", 2455 ContendedPaddingWidth, 0, 8192); 2456 status = false; 2457 } 2458 2459 // Need to enforce the padding not to break the existing field alignments. 2460 // It is sufficient to check against the largest type size. 2461 if ((ContendedPaddingWidth % BytesPerLong) != 0) { 2462 jio_fprintf(defaultStream::error_stream(), 2463 "ContendedPaddingWidth=" INTX_FORMAT " must be a multiple of %d\n", 2464 ContendedPaddingWidth, BytesPerLong); 2465 status = false; 2466 } 2467 2468 // Check lower bounds of the code cache 2469 // Template Interpreter code is approximately 3X larger in debug builds. 2470 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2471 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2472 jio_fprintf(defaultStream::error_stream(), 2473 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2474 os::vm_page_size()/K); 2475 status = false; 2476 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2477 jio_fprintf(defaultStream::error_stream(), 2478 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2479 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2480 status = false; 2481 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2482 jio_fprintf(defaultStream::error_stream(), 2483 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2484 min_code_cache_size/K); 2485 status = false; 2486 } else if (ReservedCodeCacheSize > 2*G) { 2487 // Code cache size larger than MAXINT is not supported. 2488 jio_fprintf(defaultStream::error_stream(), 2489 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2490 (2*G)/M); 2491 status = false; 2492 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2493 jio_fprintf(defaultStream::error_stream(), 2494 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2495 min_code_cache_size/K); 2496 status = false; 2497 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2498 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2499 jio_fprintf(defaultStream::error_stream(), 2500 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2501 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2502 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2503 status = false; 2504 } 2505 2506 status &= verify_interval(NmethodSweepActivity, 0, 2000, "NmethodSweepActivity"); 2507 status &= verify_interval(CodeCacheMinBlockLength, 1, 100, "CodeCacheMinBlockLength"); 2508 status &= verify_interval(CodeCacheSegmentSize, 1, 1024, "CodeCacheSegmentSize"); 2509 status &= verify_interval(StartAggressiveSweepingAt, 0, 100, "StartAggressiveSweepingAt"); 2510 2511 2512 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2513 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2514 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2515 // Check the minimum number of compiler threads 2516 status &=verify_min_value(CICompilerCount, min_number_of_compiler_threads, "CICompilerCount"); 2517 2518 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2519 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2520 } 2521 2522 return status; 2523 } 2524 2525 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2526 const char* option_type) { 2527 if (ignore) return false; 2528 2529 const char* spacer = " "; 2530 if (option_type == NULL) { 2531 option_type = ++spacer; // Set both to the empty string. 2532 } 2533 2534 if (os::obsolete_option(option)) { 2535 jio_fprintf(defaultStream::error_stream(), 2536 "Obsolete %s%soption: %s\n", option_type, spacer, 2537 option->optionString); 2538 return false; 2539 } else { 2540 jio_fprintf(defaultStream::error_stream(), 2541 "Unrecognized %s%soption: %s\n", option_type, spacer, 2542 option->optionString); 2543 return true; 2544 } 2545 } 2546 2547 static const char* user_assertion_options[] = { 2548 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2549 }; 2550 2551 static const char* system_assertion_options[] = { 2552 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2553 }; 2554 2555 bool Arguments::parse_uintx(const char* value, 2556 uintx* uintx_arg, 2557 uintx min_size) { 2558 2559 // Check the sign first since atomull() parses only unsigned values. 2560 bool value_is_positive = !(*value == '-'); 2561 2562 if (value_is_positive) { 2563 julong n; 2564 bool good_return = atomull(value, &n); 2565 if (good_return) { 2566 bool above_minimum = n >= min_size; 2567 bool value_is_too_large = n > max_uintx; 2568 2569 if (above_minimum && !value_is_too_large) { 2570 *uintx_arg = n; 2571 return true; 2572 } 2573 } 2574 } 2575 return false; 2576 } 2577 2578 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2579 julong* long_arg, 2580 julong min_size) { 2581 if (!atomull(s, long_arg)) return arg_unreadable; 2582 return check_memory_size(*long_arg, min_size); 2583 } 2584 2585 // Parse JavaVMInitArgs structure 2586 2587 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2588 // For components of the system classpath. 2589 SysClassPath scp(Arguments::get_sysclasspath()); 2590 bool scp_assembly_required = false; 2591 2592 // Save default settings for some mode flags 2593 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2594 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2595 Arguments::_ClipInlining = ClipInlining; 2596 Arguments::_BackgroundCompilation = BackgroundCompilation; 2597 2598 // Setup flags for mixed which is the default 2599 set_mode_flags(_mixed); 2600 2601 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2602 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2603 if (result != JNI_OK) { 2604 return result; 2605 } 2606 2607 // Parse JavaVMInitArgs structure passed in 2608 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, Flag::COMMAND_LINE); 2609 if (result != JNI_OK) { 2610 return result; 2611 } 2612 2613 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2614 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2615 if (result != JNI_OK) { 2616 return result; 2617 } 2618 2619 // Do final processing now that all arguments have been parsed 2620 result = finalize_vm_init_args(&scp, scp_assembly_required); 2621 if (result != JNI_OK) { 2622 return result; 2623 } 2624 2625 return JNI_OK; 2626 } 2627 2628 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2629 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2630 // are dealing with -agentpath (case where name is a path), otherwise with 2631 // -agentlib 2632 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2633 char *_name; 2634 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2635 size_t _len_hprof, _len_jdwp, _len_prefix; 2636 2637 if (is_path) { 2638 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2639 return false; 2640 } 2641 2642 _name++; // skip past last path separator 2643 _len_prefix = strlen(JNI_LIB_PREFIX); 2644 2645 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2646 return false; 2647 } 2648 2649 _name += _len_prefix; 2650 _len_hprof = strlen(_hprof); 2651 _len_jdwp = strlen(_jdwp); 2652 2653 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2654 _name += _len_hprof; 2655 } 2656 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2657 _name += _len_jdwp; 2658 } 2659 else { 2660 return false; 2661 } 2662 2663 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2664 return false; 2665 } 2666 2667 return true; 2668 } 2669 2670 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2671 return true; 2672 } 2673 2674 return false; 2675 } 2676 2677 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2678 SysClassPath* scp_p, 2679 bool* scp_assembly_required_p, 2680 Flag::Flags origin) { 2681 // Remaining part of option string 2682 const char* tail; 2683 2684 // iterate over arguments 2685 for (int index = 0; index < args->nOptions; index++) { 2686 bool is_absolute_path = false; // for -agentpath vs -agentlib 2687 2688 const JavaVMOption* option = args->options + index; 2689 2690 if (!match_option(option, "-Djava.class.path", &tail) && 2691 !match_option(option, "-Dsun.java.command", &tail) && 2692 !match_option(option, "-Dsun.java.launcher", &tail)) { 2693 2694 // add all jvm options to the jvm_args string. This string 2695 // is used later to set the java.vm.args PerfData string constant. 2696 // the -Djava.class.path and the -Dsun.java.command options are 2697 // omitted from jvm_args string as each have their own PerfData 2698 // string constant object. 2699 build_jvm_args(option->optionString); 2700 } 2701 2702 // -verbose:[class/gc/jni] 2703 if (match_option(option, "-verbose", &tail)) { 2704 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2705 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2706 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2707 } else if (!strcmp(tail, ":gc")) { 2708 FLAG_SET_CMDLINE(bool, PrintGC, true); 2709 } else if (!strcmp(tail, ":jni")) { 2710 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2711 } 2712 // -da / -ea / -disableassertions / -enableassertions 2713 // These accept an optional class/package name separated by a colon, e.g., 2714 // -da:java.lang.Thread. 2715 } else if (match_option(option, user_assertion_options, &tail, true)) { 2716 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2717 if (*tail == '\0') { 2718 JavaAssertions::setUserClassDefault(enable); 2719 } else { 2720 assert(*tail == ':', "bogus match by match_option()"); 2721 JavaAssertions::addOption(tail + 1, enable); 2722 } 2723 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2724 } else if (match_option(option, system_assertion_options, &tail, false)) { 2725 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2726 JavaAssertions::setSystemClassDefault(enable); 2727 // -bootclasspath: 2728 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2729 scp_p->reset_path(tail); 2730 *scp_assembly_required_p = true; 2731 // -bootclasspath/a: 2732 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2733 scp_p->add_suffix(tail); 2734 *scp_assembly_required_p = true; 2735 // -bootclasspath/p: 2736 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2737 scp_p->add_prefix(tail); 2738 *scp_assembly_required_p = true; 2739 // -Xrun 2740 } else if (match_option(option, "-Xrun", &tail)) { 2741 if (tail != NULL) { 2742 const char* pos = strchr(tail, ':'); 2743 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2744 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2745 name[len] = '\0'; 2746 2747 char *options = NULL; 2748 if(pos != NULL) { 2749 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2750 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2751 } 2752 #if !INCLUDE_JVMTI 2753 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2754 jio_fprintf(defaultStream::error_stream(), 2755 "Profiling and debugging agents are not supported in this VM\n"); 2756 return JNI_ERR; 2757 } 2758 #endif // !INCLUDE_JVMTI 2759 add_init_library(name, options); 2760 } 2761 // -agentlib and -agentpath 2762 } else if (match_option(option, "-agentlib:", &tail) || 2763 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2764 if(tail != NULL) { 2765 const char* pos = strchr(tail, '='); 2766 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2767 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2768 name[len] = '\0'; 2769 2770 char *options = NULL; 2771 if(pos != NULL) { 2772 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1, mtInternal), pos + 1); 2773 } 2774 #if !INCLUDE_JVMTI 2775 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2776 jio_fprintf(defaultStream::error_stream(), 2777 "Profiling and debugging agents are not supported in this VM\n"); 2778 return JNI_ERR; 2779 } 2780 #endif // !INCLUDE_JVMTI 2781 add_init_agent(name, options, is_absolute_path); 2782 } 2783 // -javaagent 2784 } else if (match_option(option, "-javaagent:", &tail)) { 2785 #if !INCLUDE_JVMTI 2786 jio_fprintf(defaultStream::error_stream(), 2787 "Instrumentation agents are not supported in this VM\n"); 2788 return JNI_ERR; 2789 #else 2790 if(tail != NULL) { 2791 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2792 add_init_agent("instrument", options, false); 2793 } 2794 #endif // !INCLUDE_JVMTI 2795 // -Xnoclassgc 2796 } else if (match_option(option, "-Xnoclassgc")) { 2797 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2798 // -Xconcgc 2799 } else if (match_option(option, "-Xconcgc")) { 2800 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2801 // -Xnoconcgc 2802 } else if (match_option(option, "-Xnoconcgc")) { 2803 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2804 // -Xbatch 2805 } else if (match_option(option, "-Xbatch")) { 2806 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2807 // -Xmn for compatibility with other JVM vendors 2808 } else if (match_option(option, "-Xmn", &tail)) { 2809 julong long_initial_young_size = 0; 2810 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2811 if (errcode != arg_in_range) { 2812 jio_fprintf(defaultStream::error_stream(), 2813 "Invalid initial young generation size: %s\n", option->optionString); 2814 describe_range_error(errcode); 2815 return JNI_EINVAL; 2816 } 2817 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_young_size); 2818 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_young_size); 2819 // -Xms 2820 } else if (match_option(option, "-Xms", &tail)) { 2821 julong long_initial_heap_size = 0; 2822 // an initial heap size of 0 means automatically determine 2823 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2824 if (errcode != arg_in_range) { 2825 jio_fprintf(defaultStream::error_stream(), 2826 "Invalid initial heap size: %s\n", option->optionString); 2827 describe_range_error(errcode); 2828 return JNI_EINVAL; 2829 } 2830 set_min_heap_size((uintx)long_initial_heap_size); 2831 // Currently the minimum size and the initial heap sizes are the same. 2832 // Can be overridden with -XX:InitialHeapSize. 2833 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2834 // -Xmx 2835 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2836 julong long_max_heap_size = 0; 2837 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2838 if (errcode != arg_in_range) { 2839 jio_fprintf(defaultStream::error_stream(), 2840 "Invalid maximum heap size: %s\n", option->optionString); 2841 describe_range_error(errcode); 2842 return JNI_EINVAL; 2843 } 2844 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2845 // Xmaxf 2846 } else if (match_option(option, "-Xmaxf", &tail)) { 2847 char* err; 2848 int maxf = (int)(strtod(tail, &err) * 100); 2849 if (*err != '\0' || *tail == '\0' || maxf < 0 || maxf > 100) { 2850 jio_fprintf(defaultStream::error_stream(), 2851 "Bad max heap free percentage size: %s\n", 2852 option->optionString); 2853 return JNI_EINVAL; 2854 } else { 2855 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2856 } 2857 // Xminf 2858 } else if (match_option(option, "-Xminf", &tail)) { 2859 char* err; 2860 int minf = (int)(strtod(tail, &err) * 100); 2861 if (*err != '\0' || *tail == '\0' || minf < 0 || minf > 100) { 2862 jio_fprintf(defaultStream::error_stream(), 2863 "Bad min heap free percentage size: %s\n", 2864 option->optionString); 2865 return JNI_EINVAL; 2866 } else { 2867 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2868 } 2869 // -Xss 2870 } else if (match_option(option, "-Xss", &tail)) { 2871 julong long_ThreadStackSize = 0; 2872 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2873 if (errcode != arg_in_range) { 2874 jio_fprintf(defaultStream::error_stream(), 2875 "Invalid thread stack size: %s\n", option->optionString); 2876 describe_range_error(errcode); 2877 return JNI_EINVAL; 2878 } 2879 // Internally track ThreadStackSize in units of 1024 bytes. 2880 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2881 round_to((int)long_ThreadStackSize, K) / K); 2882 // -Xoss 2883 } else if (match_option(option, "-Xoss", &tail)) { 2884 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2885 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2886 julong long_CodeCacheExpansionSize = 0; 2887 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2888 if (errcode != arg_in_range) { 2889 jio_fprintf(defaultStream::error_stream(), 2890 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2891 os::vm_page_size()/K); 2892 return JNI_EINVAL; 2893 } 2894 FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize); 2895 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2896 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2897 julong long_ReservedCodeCacheSize = 0; 2898 2899 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2900 if (errcode != arg_in_range) { 2901 jio_fprintf(defaultStream::error_stream(), 2902 "Invalid maximum code cache size: %s.\n", option->optionString); 2903 return JNI_EINVAL; 2904 } 2905 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2906 // -XX:NonNMethodCodeHeapSize= 2907 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2908 julong long_NonNMethodCodeHeapSize = 0; 2909 2910 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2911 if (errcode != arg_in_range) { 2912 jio_fprintf(defaultStream::error_stream(), 2913 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2914 return JNI_EINVAL; 2915 } 2916 FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize); 2917 // -XX:ProfiledCodeHeapSize= 2918 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2919 julong long_ProfiledCodeHeapSize = 0; 2920 2921 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2922 if (errcode != arg_in_range) { 2923 jio_fprintf(defaultStream::error_stream(), 2924 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2925 return JNI_EINVAL; 2926 } 2927 FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize); 2928 // -XX:NonProfiledCodeHeapSizee= 2929 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2930 julong long_NonProfiledCodeHeapSize = 0; 2931 2932 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2933 if (errcode != arg_in_range) { 2934 jio_fprintf(defaultStream::error_stream(), 2935 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2936 return JNI_EINVAL; 2937 } 2938 FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize); 2939 //-XX:IncreaseFirstTierCompileThresholdAt= 2940 } else if (match_option(option, "-XX:IncreaseFirstTierCompileThresholdAt=", &tail)) { 2941 uintx uint_IncreaseFirstTierCompileThresholdAt = 0; 2942 if (!parse_uintx(tail, &uint_IncreaseFirstTierCompileThresholdAt, 0) || uint_IncreaseFirstTierCompileThresholdAt > 99) { 2943 jio_fprintf(defaultStream::error_stream(), 2944 "Invalid value for IncreaseFirstTierCompileThresholdAt: %s. Should be between 0 and 99.\n", 2945 option->optionString); 2946 return JNI_EINVAL; 2947 } 2948 FLAG_SET_CMDLINE(uintx, IncreaseFirstTierCompileThresholdAt, (uintx)uint_IncreaseFirstTierCompileThresholdAt); 2949 // -green 2950 } else if (match_option(option, "-green")) { 2951 jio_fprintf(defaultStream::error_stream(), 2952 "Green threads support not available\n"); 2953 return JNI_EINVAL; 2954 // -native 2955 } else if (match_option(option, "-native")) { 2956 // HotSpot always uses native threads, ignore silently for compatibility 2957 // -Xsqnopause 2958 } else if (match_option(option, "-Xsqnopause")) { 2959 // EVM option, ignore silently for compatibility 2960 // -Xrs 2961 } else if (match_option(option, "-Xrs")) { 2962 // Classic/EVM option, new functionality 2963 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2964 } else if (match_option(option, "-Xusealtsigs")) { 2965 // change default internal VM signals used - lower case for back compat 2966 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2967 // -Xoptimize 2968 } else if (match_option(option, "-Xoptimize")) { 2969 // EVM option, ignore silently for compatibility 2970 // -Xprof 2971 } else if (match_option(option, "-Xprof")) { 2972 #if INCLUDE_FPROF 2973 _has_profile = true; 2974 #else // INCLUDE_FPROF 2975 jio_fprintf(defaultStream::error_stream(), 2976 "Flat profiling is not supported in this VM.\n"); 2977 return JNI_ERR; 2978 #endif // INCLUDE_FPROF 2979 // -Xconcurrentio 2980 } else if (match_option(option, "-Xconcurrentio")) { 2981 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2982 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2983 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2984 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2985 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2986 2987 // -Xinternalversion 2988 } else if (match_option(option, "-Xinternalversion")) { 2989 jio_fprintf(defaultStream::output_stream(), "%s\n", 2990 VM_Version::internal_vm_info_string()); 2991 vm_exit(0); 2992 #ifndef PRODUCT 2993 // -Xprintflags 2994 } else if (match_option(option, "-Xprintflags")) { 2995 CommandLineFlags::printFlags(tty, false); 2996 vm_exit(0); 2997 #endif 2998 // -D 2999 } else if (match_option(option, "-D", &tail)) { 3000 if (match_option(option, "-Djava.endorsed.dirs=", &tail)) { 3001 // abort if -Djava.endorsed.dirs is set 3002 jio_fprintf(defaultStream::output_stream(), 3003 "-Djava.endorsed.dirs is not supported. Endorsed standards and standalone APIs\n" 3004 "in modular form will be supported via the concept of upgradeable modules.\n"); 3005 return JNI_EINVAL; 3006 } 3007 if (match_option(option, "-Djava.ext.dirs=", &tail)) { 3008 // abort if -Djava.ext.dirs is set 3009 jio_fprintf(defaultStream::output_stream(), 3010 "-Djava.ext.dirs is not supported. Use -classpath instead.\n"); 3011 return JNI_EINVAL; 3012 } 3013 3014 if (!add_property(tail)) { 3015 return JNI_ENOMEM; 3016 } 3017 // Out of the box management support 3018 if (match_option(option, "-Dcom.sun.management", &tail)) { 3019 #if INCLUDE_MANAGEMENT 3020 FLAG_SET_CMDLINE(bool, ManagementServer, true); 3021 #else 3022 jio_fprintf(defaultStream::output_stream(), 3023 "-Dcom.sun.management is not supported in this VM.\n"); 3024 return JNI_ERR; 3025 #endif 3026 } 3027 // -Xint 3028 } else if (match_option(option, "-Xint")) { 3029 set_mode_flags(_int); 3030 // -Xmixed 3031 } else if (match_option(option, "-Xmixed")) { 3032 set_mode_flags(_mixed); 3033 // -Xcomp 3034 } else if (match_option(option, "-Xcomp")) { 3035 // for testing the compiler; turn off all flags that inhibit compilation 3036 set_mode_flags(_comp); 3037 // -Xshare:dump 3038 } else if (match_option(option, "-Xshare:dump")) { 3039 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 3040 set_mode_flags(_int); // Prevent compilation, which creates objects 3041 // -Xshare:on 3042 } else if (match_option(option, "-Xshare:on")) { 3043 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3044 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3045 // -Xshare:auto 3046 } else if (match_option(option, "-Xshare:auto")) { 3047 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3048 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3049 // -Xshare:off 3050 } else if (match_option(option, "-Xshare:off")) { 3051 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 3052 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 3053 // -Xverify 3054 } else if (match_option(option, "-Xverify", &tail)) { 3055 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3056 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 3057 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3058 } else if (strcmp(tail, ":remote") == 0) { 3059 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3060 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 3061 } else if (strcmp(tail, ":none") == 0) { 3062 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 3063 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 3064 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3065 return JNI_EINVAL; 3066 } 3067 // -Xdebug 3068 } else if (match_option(option, "-Xdebug")) { 3069 // note this flag has been used, then ignore 3070 set_xdebug_mode(true); 3071 // -Xnoagent 3072 } else if (match_option(option, "-Xnoagent")) { 3073 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3074 } else if (match_option(option, "-Xboundthreads")) { 3075 // Bind user level threads to kernel threads (Solaris only) 3076 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 3077 } else if (match_option(option, "-Xloggc:", &tail)) { 3078 // Redirect GC output to the file. -Xloggc:<filename> 3079 // ostream_init_log(), when called will use this filename 3080 // to initialize a fileStream. 3081 _gc_log_filename = os::strdup_check_oom(tail); 3082 if (!is_filename_valid(_gc_log_filename)) { 3083 jio_fprintf(defaultStream::output_stream(), 3084 "Invalid file name for use with -Xloggc: Filename can only contain the " 3085 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 3086 "Note %%p or %%t can only be used once\n", _gc_log_filename); 3087 return JNI_EINVAL; 3088 } 3089 FLAG_SET_CMDLINE(bool, PrintGC, true); 3090 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 3091 3092 // JNI hooks 3093 } else if (match_option(option, "-Xcheck", &tail)) { 3094 if (!strcmp(tail, ":jni")) { 3095 #if !INCLUDE_JNI_CHECK 3096 warning("JNI CHECKING is not supported in this VM"); 3097 #else 3098 CheckJNICalls = true; 3099 #endif // INCLUDE_JNI_CHECK 3100 } else if (is_bad_option(option, args->ignoreUnrecognized, 3101 "check")) { 3102 return JNI_EINVAL; 3103 } 3104 } else if (match_option(option, "vfprintf")) { 3105 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3106 } else if (match_option(option, "exit")) { 3107 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3108 } else if (match_option(option, "abort")) { 3109 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3110 // -XX:+AggressiveHeap 3111 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3112 3113 // This option inspects the machine and attempts to set various 3114 // parameters to be optimal for long-running, memory allocation 3115 // intensive jobs. It is intended for machines with large 3116 // amounts of cpu and memory. 3117 3118 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 3119 // VM, but we may not be able to represent the total physical memory 3120 // available (like having 8gb of memory on a box but using a 32bit VM). 3121 // Thus, we need to make sure we're using a julong for intermediate 3122 // calculations. 3123 julong initHeapSize; 3124 julong total_memory = os::physical_memory(); 3125 3126 if (total_memory < (julong)256*M) { 3127 jio_fprintf(defaultStream::error_stream(), 3128 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 3129 vm_exit(1); 3130 } 3131 3132 // The heap size is half of available memory, or (at most) 3133 // all of possible memory less 160mb (leaving room for the OS 3134 // when using ISM). This is the maximum; because adaptive sizing 3135 // is turned on below, the actual space used may be smaller. 3136 3137 initHeapSize = MIN2(total_memory / (julong)2, 3138 total_memory - (julong)160*M); 3139 3140 initHeapSize = limit_by_allocatable_memory(initHeapSize); 3141 3142 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 3143 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 3144 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 3145 // Currently the minimum size and the initial heap sizes are the same. 3146 set_min_heap_size(initHeapSize); 3147 } 3148 if (FLAG_IS_DEFAULT(NewSize)) { 3149 // Make the young generation 3/8ths of the total heap. 3150 FLAG_SET_CMDLINE(uintx, NewSize, 3151 ((julong)MaxHeapSize / (julong)8) * (julong)3); 3152 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 3153 } 3154 3155 #ifndef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3156 FLAG_SET_DEFAULT(UseLargePages, true); 3157 #endif 3158 3159 // Increase some data structure sizes for efficiency 3160 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 3161 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3162 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 3163 3164 // See the OldPLABSize comment below, but replace 'after promotion' 3165 // with 'after copying'. YoungPLABSize is the size of the survivor 3166 // space per-gc-thread buffers. The default is 4kw. 3167 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 3168 3169 // OldPLABSize is the size of the buffers in the old gen that 3170 // UseParallelGC uses to promote live data that doesn't fit in the 3171 // survivor spaces. At any given time, there's one for each gc thread. 3172 // The default size is 1kw. These buffers are rarely used, since the 3173 // survivor spaces are usually big enough. For specjbb, however, there 3174 // are occasions when there's lots of live data in the young gen 3175 // and we end up promoting some of it. We don't have a definite 3176 // explanation for why bumping OldPLABSize helps, but the theory 3177 // is that a bigger PLAB results in retaining something like the 3178 // original allocation order after promotion, which improves mutator 3179 // locality. A minor effect may be that larger PLABs reduce the 3180 // number of PLAB allocation events during gc. The value of 8kw 3181 // was arrived at by experimenting with specjbb. 3182 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 3183 3184 // Enable parallel GC and adaptive generation sizing 3185 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 3186 FLAG_SET_DEFAULT(ParallelGCThreads, 3187 Abstract_VM_Version::parallel_worker_threads()); 3188 3189 // Encourage steady state memory management 3190 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 3191 3192 // This appears to improve mutator locality 3193 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3194 3195 // Get around early Solaris scheduling bug 3196 // (affinity vs other jobs on system) 3197 // but disallow DR and offlining (5008695). 3198 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 3199 3200 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3201 // and the last option wins. 3202 } else if (match_option(option, "-XX:+NeverTenure")) { 3203 FLAG_SET_CMDLINE(bool, NeverTenure, true); 3204 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3205 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1); 3206 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3207 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3208 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3209 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0); 3210 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3211 uintx max_tenuring_thresh = 0; 3212 if(!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3213 jio_fprintf(defaultStream::error_stream(), 3214 "Invalid MaxTenuringThreshold: %s\n", option->optionString); 3215 } 3216 FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh); 3217 3218 if (MaxTenuringThreshold == 0) { 3219 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3220 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 3221 } else { 3222 FLAG_SET_CMDLINE(bool, NeverTenure, false); 3223 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 3224 } 3225 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled") || 3226 match_option(option, "-XX:-CMSPermGenSweepingEnabled")) { 3227 jio_fprintf(defaultStream::error_stream(), 3228 "Please use CMSClassUnloadingEnabled in place of " 3229 "CMSPermGenSweepingEnabled in the future\n"); 3230 } else if (match_option(option, "-XX:+UseGCTimeLimit")) { 3231 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 3232 jio_fprintf(defaultStream::error_stream(), 3233 "Please use -XX:+UseGCOverheadLimit in place of " 3234 "-XX:+UseGCTimeLimit in the future\n"); 3235 } else if (match_option(option, "-XX:-UseGCTimeLimit")) { 3236 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 3237 jio_fprintf(defaultStream::error_stream(), 3238 "Please use -XX:-UseGCOverheadLimit in place of " 3239 "-XX:-UseGCTimeLimit in the future\n"); 3240 // The TLE options are for compatibility with 1.3 and will be 3241 // removed without notice in a future release. These options 3242 // are not to be documented. 3243 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 3244 // No longer used. 3245 } else if (match_option(option, "-XX:+ResizeTLE")) { 3246 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 3247 } else if (match_option(option, "-XX:-ResizeTLE")) { 3248 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 3249 } else if (match_option(option, "-XX:+PrintTLE")) { 3250 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 3251 } else if (match_option(option, "-XX:-PrintTLE")) { 3252 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 3253 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 3254 // No longer used. 3255 } else if (match_option(option, "-XX:TLESize=", &tail)) { 3256 julong long_tlab_size = 0; 3257 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 3258 if (errcode != arg_in_range) { 3259 jio_fprintf(defaultStream::error_stream(), 3260 "Invalid TLAB size: %s\n", option->optionString); 3261 describe_range_error(errcode); 3262 return JNI_EINVAL; 3263 } 3264 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 3265 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 3266 // No longer used. 3267 } else if (match_option(option, "-XX:+UseTLE")) { 3268 FLAG_SET_CMDLINE(bool, UseTLAB, true); 3269 } else if (match_option(option, "-XX:-UseTLE")) { 3270 FLAG_SET_CMDLINE(bool, UseTLAB, false); 3271 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3272 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 3273 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 3274 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3275 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 3276 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 3277 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3278 #if defined(DTRACE_ENABLED) 3279 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 3280 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 3281 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 3282 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 3283 #else // defined(DTRACE_ENABLED) 3284 jio_fprintf(defaultStream::error_stream(), 3285 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3286 return JNI_EINVAL; 3287 #endif // defined(DTRACE_ENABLED) 3288 #ifdef ASSERT 3289 } else if (match_option(option, "-XX:+FullGCALot")) { 3290 FLAG_SET_CMDLINE(bool, FullGCALot, true); 3291 // disable scavenge before parallel mark-compact 3292 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 3293 #endif 3294 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 3295 julong cms_blocks_to_claim = (julong)atol(tail); 3296 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3297 jio_fprintf(defaultStream::error_stream(), 3298 "Please use -XX:OldPLABSize in place of " 3299 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 3300 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 3301 julong cms_blocks_to_claim = (julong)atol(tail); 3302 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 3303 jio_fprintf(defaultStream::error_stream(), 3304 "Please use -XX:OldPLABSize in place of " 3305 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 3306 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 3307 julong old_plab_size = 0; 3308 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 3309 if (errcode != arg_in_range) { 3310 jio_fprintf(defaultStream::error_stream(), 3311 "Invalid old PLAB size: %s\n", option->optionString); 3312 describe_range_error(errcode); 3313 return JNI_EINVAL; 3314 } 3315 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 3316 jio_fprintf(defaultStream::error_stream(), 3317 "Please use -XX:OldPLABSize in place of " 3318 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 3319 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 3320 julong young_plab_size = 0; 3321 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 3322 if (errcode != arg_in_range) { 3323 jio_fprintf(defaultStream::error_stream(), 3324 "Invalid young PLAB size: %s\n", option->optionString); 3325 describe_range_error(errcode); 3326 return JNI_EINVAL; 3327 } 3328 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 3329 jio_fprintf(defaultStream::error_stream(), 3330 "Please use -XX:YoungPLABSize in place of " 3331 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 3332 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3333 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3334 julong stack_size = 0; 3335 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3336 if (errcode != arg_in_range) { 3337 jio_fprintf(defaultStream::error_stream(), 3338 "Invalid mark stack size: %s\n", option->optionString); 3339 describe_range_error(errcode); 3340 return JNI_EINVAL; 3341 } 3342 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 3343 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3344 julong max_stack_size = 0; 3345 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3346 if (errcode != arg_in_range) { 3347 jio_fprintf(defaultStream::error_stream(), 3348 "Invalid maximum mark stack size: %s\n", 3349 option->optionString); 3350 describe_range_error(errcode); 3351 return JNI_EINVAL; 3352 } 3353 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 3354 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3355 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3356 uintx conc_threads = 0; 3357 if (!parse_uintx(tail, &conc_threads, 1)) { 3358 jio_fprintf(defaultStream::error_stream(), 3359 "Invalid concurrent threads: %s\n", option->optionString); 3360 return JNI_EINVAL; 3361 } 3362 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 3363 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3364 julong max_direct_memory_size = 0; 3365 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3366 if (errcode != arg_in_range) { 3367 jio_fprintf(defaultStream::error_stream(), 3368 "Invalid maximum direct memory size: %s\n", 3369 option->optionString); 3370 describe_range_error(errcode); 3371 return JNI_EINVAL; 3372 } 3373 FLAG_SET_CMDLINE(uintx, MaxDirectMemorySize, max_direct_memory_size); 3374 #if !INCLUDE_MANAGEMENT 3375 } else if (match_option(option, "-XX:+ManagementServer")) { 3376 jio_fprintf(defaultStream::error_stream(), 3377 "ManagementServer is not supported in this VM.\n"); 3378 return JNI_ERR; 3379 #endif // INCLUDE_MANAGEMENT 3380 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3381 // Skip -XX:Flags= since that case has already been handled 3382 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3383 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3384 return JNI_EINVAL; 3385 } 3386 } 3387 // Unknown option 3388 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3389 return JNI_ERR; 3390 } 3391 } 3392 3393 // PrintSharedArchiveAndExit will turn on 3394 // -Xshare:on 3395 // -XX:+TraceClassPaths 3396 if (PrintSharedArchiveAndExit) { 3397 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 3398 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 3399 FLAG_SET_CMDLINE(bool, TraceClassPaths, true); 3400 } 3401 3402 // Change the default value for flags which have different default values 3403 // when working with older JDKs. 3404 #ifdef LINUX 3405 if (JDK_Version::current().compare_major(6) <= 0 && 3406 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3407 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3408 } 3409 #endif // LINUX 3410 fix_appclasspath(); 3411 return JNI_OK; 3412 } 3413 3414 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3415 // 3416 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3417 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3418 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3419 // path is treated as the current directory. 3420 // 3421 // This causes problems with CDS, which requires that all directories specified in the classpath 3422 // must be empty. In most cases, applications do NOT want to load classes from the current 3423 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3424 // scripts compatible with CDS. 3425 void Arguments::fix_appclasspath() { 3426 if (IgnoreEmptyClassPaths) { 3427 const char separator = *os::path_separator(); 3428 const char* src = _java_class_path->value(); 3429 3430 // skip over all the leading empty paths 3431 while (*src == separator) { 3432 src ++; 3433 } 3434 3435 char* copy = AllocateHeap(strlen(src) + 1, mtInternal); 3436 strncpy(copy, src, strlen(src) + 1); 3437 3438 // trim all trailing empty paths 3439 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3440 *tail = '\0'; 3441 } 3442 3443 char from[3] = {separator, separator, '\0'}; 3444 char to [2] = {separator, '\0'}; 3445 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3446 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3447 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3448 } 3449 3450 _java_class_path->set_value(copy); 3451 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3452 } 3453 3454 if (!PrintSharedArchiveAndExit) { 3455 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3456 } 3457 } 3458 3459 static bool has_jar_files(const char* directory) { 3460 DIR* dir = os::opendir(directory); 3461 if (dir == NULL) return false; 3462 3463 struct dirent *entry; 3464 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3465 bool hasJarFile = false; 3466 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3467 const char* name = entry->d_name; 3468 const char* ext = name + strlen(name) - 4; 3469 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3470 } 3471 FREE_C_HEAP_ARRAY(char, dbuf); 3472 os::closedir(dir); 3473 return hasJarFile ; 3474 } 3475 3476 static int check_non_empty_dirs(const char* path) { 3477 const char separator = *os::path_separator(); 3478 const char* const end = path + strlen(path); 3479 int nonEmptyDirs = 0; 3480 while (path < end) { 3481 const char* tmp_end = strchr(path, separator); 3482 if (tmp_end == NULL) { 3483 if (has_jar_files(path)) { 3484 nonEmptyDirs++; 3485 jio_fprintf(defaultStream::output_stream(), 3486 "Non-empty directory: %s\n", path); 3487 } 3488 path = end; 3489 } else { 3490 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3491 memcpy(dirpath, path, tmp_end - path); 3492 dirpath[tmp_end - path] = '\0'; 3493 if (has_jar_files(dirpath)) { 3494 nonEmptyDirs++; 3495 jio_fprintf(defaultStream::output_stream(), 3496 "Non-empty directory: %s\n", dirpath); 3497 } 3498 FREE_C_HEAP_ARRAY(char, dirpath); 3499 path = tmp_end + 1; 3500 } 3501 } 3502 return nonEmptyDirs; 3503 } 3504 3505 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3506 // check if the default lib/endorsed directory exists; if so, error 3507 char path[JVM_MAXPATHLEN]; 3508 const char* fileSep = os::file_separator(); 3509 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3510 3511 if (CheckEndorsedAndExtDirs) { 3512 int nonEmptyDirs = 0; 3513 // check endorsed directory 3514 nonEmptyDirs += check_non_empty_dirs(path); 3515 // check the extension directories 3516 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3517 if (nonEmptyDirs > 0) { 3518 return JNI_ERR; 3519 } 3520 } 3521 3522 DIR* dir = os::opendir(path); 3523 if (dir != NULL) { 3524 jio_fprintf(defaultStream::output_stream(), 3525 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3526 "in modular form will be supported via the concept of upgradeable modules.\n"); 3527 os::closedir(dir); 3528 return JNI_ERR; 3529 } 3530 3531 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3532 dir = os::opendir(path); 3533 if (dir != NULL) { 3534 jio_fprintf(defaultStream::output_stream(), 3535 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3536 "Use -classpath instead.\n."); 3537 os::closedir(dir); 3538 return JNI_ERR; 3539 } 3540 3541 if (scp_assembly_required) { 3542 // Assemble the bootclasspath elements into the final path. 3543 Arguments::set_sysclasspath(scp_p->combined_path()); 3544 } 3545 3546 // This must be done after all arguments have been processed. 3547 // java_compiler() true means set to "NONE" or empty. 3548 if (java_compiler() && !xdebug_mode()) { 3549 // For backwards compatibility, we switch to interpreted mode if 3550 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3551 // not specified. 3552 set_mode_flags(_int); 3553 } 3554 3555 if ((TieredCompilation && CompileThresholdScaling == 0) 3556 || (!TieredCompilation && get_scaled_compile_threshold(CompileThreshold) == 0)) { 3557 set_mode_flags(_int); 3558 } 3559 3560 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3561 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3562 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3563 } 3564 3565 #ifndef COMPILER2 3566 // Don't degrade server performance for footprint 3567 if (FLAG_IS_DEFAULT(UseLargePages) && 3568 MaxHeapSize < LargePageHeapSizeThreshold) { 3569 // No need for large granularity pages w/small heaps. 3570 // Note that large pages are enabled/disabled for both the 3571 // Java heap and the code cache. 3572 FLAG_SET_DEFAULT(UseLargePages, false); 3573 } 3574 3575 #else 3576 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3577 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3578 } 3579 #endif 3580 3581 #ifndef TIERED 3582 // Tiered compilation is undefined. 3583 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3584 #endif 3585 3586 // If we are running in a headless jre, force java.awt.headless property 3587 // to be true unless the property has already been set. 3588 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3589 if (os::is_headless_jre()) { 3590 const char* headless = Arguments::get_property("java.awt.headless"); 3591 if (headless == NULL) { 3592 char envbuffer[128]; 3593 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 3594 if (!add_property("java.awt.headless=true")) { 3595 return JNI_ENOMEM; 3596 } 3597 } else { 3598 char buffer[256]; 3599 strcpy(buffer, "java.awt.headless="); 3600 strcat(buffer, envbuffer); 3601 if (!add_property(buffer)) { 3602 return JNI_ENOMEM; 3603 } 3604 } 3605 } 3606 } 3607 3608 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3609 // CMS can only be used with ParNew 3610 FLAG_SET_ERGO(bool, UseParNewGC, true); 3611 } 3612 3613 if (!check_vm_args_consistency()) { 3614 return JNI_ERR; 3615 } 3616 3617 return JNI_OK; 3618 } 3619 3620 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3621 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 3622 scp_assembly_required_p); 3623 } 3624 3625 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 3626 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 3627 scp_assembly_required_p); 3628 } 3629 3630 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 3631 const int N_MAX_OPTIONS = 64; 3632 const int OPTION_BUFFER_SIZE = 1024; 3633 char buffer[OPTION_BUFFER_SIZE]; 3634 3635 // The variable will be ignored if it exceeds the length of the buffer. 3636 // Don't check this variable if user has special privileges 3637 // (e.g. unix su command). 3638 if (os::getenv(name, buffer, sizeof(buffer)) && 3639 !os::have_special_privileges()) { 3640 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 3641 jio_fprintf(defaultStream::error_stream(), 3642 "Picked up %s: %s\n", name, buffer); 3643 char* rd = buffer; // pointer to the input string (rd) 3644 int i; 3645 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 3646 while (isspace(*rd)) rd++; // skip whitespace 3647 if (*rd == 0) break; // we re done when the input string is read completely 3648 3649 // The output, option string, overwrites the input string. 3650 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3651 // input string (rd). 3652 char* wrt = rd; 3653 3654 options[i++].optionString = wrt; // Fill in option 3655 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3656 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3657 int quote = *rd; // matching quote to look for 3658 rd++; // don't copy open quote 3659 while (*rd != quote) { // include everything (even spaces) up until quote 3660 if (*rd == 0) { // string termination means unmatched string 3661 jio_fprintf(defaultStream::error_stream(), 3662 "Unmatched quote in %s\n", name); 3663 return JNI_ERR; 3664 } 3665 *wrt++ = *rd++; // copy to option string 3666 } 3667 rd++; // don't copy close quote 3668 } else { 3669 *wrt++ = *rd++; // copy to option string 3670 } 3671 } 3672 // Need to check if we're done before writing a NULL, 3673 // because the write could be to the byte that rd is pointing to. 3674 if (*rd++ == 0) { 3675 *wrt = 0; 3676 break; 3677 } 3678 *wrt = 0; // Zero terminate option 3679 } 3680 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 3681 JavaVMInitArgs vm_args; 3682 vm_args.version = JNI_VERSION_1_2; 3683 vm_args.options = options; 3684 vm_args.nOptions = i; 3685 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3686 3687 if (PrintVMOptions) { 3688 const char* tail; 3689 for (int i = 0; i < vm_args.nOptions; i++) { 3690 const JavaVMOption *option = vm_args.options + i; 3691 if (match_option(option, "-XX:", &tail)) { 3692 logOption(tail); 3693 } 3694 } 3695 } 3696 3697 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, Flag::ENVIRON_VAR)); 3698 } 3699 return JNI_OK; 3700 } 3701 3702 void Arguments::set_shared_spaces_flags() { 3703 if (DumpSharedSpaces) { 3704 if (RequireSharedSpaces) { 3705 warning("cannot dump shared archive while using shared archive"); 3706 } 3707 UseSharedSpaces = false; 3708 #ifdef _LP64 3709 if (!UseCompressedOops || !UseCompressedClassPointers) { 3710 vm_exit_during_initialization( 3711 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3712 } 3713 } else { 3714 if (!UseCompressedOops || !UseCompressedClassPointers) { 3715 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3716 } 3717 #endif 3718 } 3719 } 3720 3721 #if !INCLUDE_ALL_GCS 3722 static void force_serial_gc() { 3723 FLAG_SET_DEFAULT(UseSerialGC, true); 3724 UNSUPPORTED_GC_OPTION(UseG1GC); 3725 UNSUPPORTED_GC_OPTION(UseParallelGC); 3726 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3727 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3728 UNSUPPORTED_GC_OPTION(UseParNewGC); 3729 } 3730 #endif // INCLUDE_ALL_GCS 3731 3732 // Sharing support 3733 // Construct the path to the archive 3734 static char* get_shared_archive_path() { 3735 char *shared_archive_path; 3736 if (SharedArchiveFile == NULL) { 3737 char jvm_path[JVM_MAXPATHLEN]; 3738 os::jvm_path(jvm_path, sizeof(jvm_path)); 3739 char *end = strrchr(jvm_path, *os::file_separator()); 3740 if (end != NULL) *end = '\0'; 3741 size_t jvm_path_len = strlen(jvm_path); 3742 size_t file_sep_len = strlen(os::file_separator()); 3743 shared_archive_path = NEW_C_HEAP_ARRAY(char, jvm_path_len + 3744 file_sep_len + 20, mtInternal); 3745 if (shared_archive_path != NULL) { 3746 strncpy(shared_archive_path, jvm_path, jvm_path_len + 1); 3747 strncat(shared_archive_path, os::file_separator(), file_sep_len); 3748 strncat(shared_archive_path, "classes.jsa", 11); 3749 } 3750 } else { 3751 shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(SharedArchiveFile) + 1, mtInternal); 3752 if (shared_archive_path != NULL) { 3753 strncpy(shared_archive_path, SharedArchiveFile, strlen(SharedArchiveFile) + 1); 3754 } 3755 } 3756 return shared_archive_path; 3757 } 3758 3759 #ifndef PRODUCT 3760 // Determine whether LogVMOutput should be implicitly turned on. 3761 static bool use_vm_log() { 3762 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3763 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3764 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3765 PrintAssembly || TraceDeoptimization || TraceDependencies || 3766 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3767 return true; 3768 } 3769 3770 #ifdef COMPILER1 3771 if (PrintC1Statistics) { 3772 return true; 3773 } 3774 #endif // COMPILER1 3775 3776 #ifdef COMPILER2 3777 if (PrintOptoAssembly || PrintOptoStatistics) { 3778 return true; 3779 } 3780 #endif // COMPILER2 3781 3782 return false; 3783 } 3784 #endif // PRODUCT 3785 3786 // Parse entry point called from JNI_CreateJavaVM 3787 3788 jint Arguments::parse(const JavaVMInitArgs* args) { 3789 3790 // Remaining part of option string 3791 const char* tail; 3792 3793 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3794 const char* hotspotrc = ".hotspotrc"; 3795 bool settings_file_specified = false; 3796 bool needs_hotspotrc_warning = false; 3797 3798 const char* flags_file; 3799 int index; 3800 for (index = 0; index < args->nOptions; index++) { 3801 const JavaVMOption *option = args->options + index; 3802 if (ArgumentsExt::process_options(option)) { 3803 continue; 3804 } 3805 if (match_option(option, "-XX:Flags=", &tail)) { 3806 flags_file = tail; 3807 settings_file_specified = true; 3808 continue; 3809 } 3810 if (match_option(option, "-XX:+PrintVMOptions")) { 3811 PrintVMOptions = true; 3812 continue; 3813 } 3814 if (match_option(option, "-XX:-PrintVMOptions")) { 3815 PrintVMOptions = false; 3816 continue; 3817 } 3818 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3819 IgnoreUnrecognizedVMOptions = true; 3820 continue; 3821 } 3822 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3823 IgnoreUnrecognizedVMOptions = false; 3824 continue; 3825 } 3826 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3827 CommandLineFlags::printFlags(tty, false); 3828 vm_exit(0); 3829 } 3830 #if INCLUDE_NMT 3831 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3832 // The launcher did not setup nmt environment variable properly. 3833 if (!MemTracker::check_launcher_nmt_support(tail)) { 3834 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3835 } 3836 3837 // Verify if nmt option is valid. 3838 if (MemTracker::verify_nmt_option()) { 3839 // Late initialization, still in single-threaded mode. 3840 if (MemTracker::tracking_level() >= NMT_summary) { 3841 MemTracker::init(); 3842 } 3843 } else { 3844 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3845 } 3846 continue; 3847 } 3848 #endif 3849 3850 3851 #ifndef PRODUCT 3852 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3853 CommandLineFlags::printFlags(tty, true); 3854 vm_exit(0); 3855 } 3856 #endif 3857 } 3858 3859 if (IgnoreUnrecognizedVMOptions) { 3860 // uncast const to modify the flag args->ignoreUnrecognized 3861 *(jboolean*)(&args->ignoreUnrecognized) = true; 3862 } 3863 3864 // Parse specified settings file 3865 if (settings_file_specified) { 3866 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3867 return JNI_EINVAL; 3868 } 3869 } else { 3870 #ifdef ASSERT 3871 // Parse default .hotspotrc settings file 3872 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3873 return JNI_EINVAL; 3874 } 3875 #else 3876 struct stat buf; 3877 if (os::stat(hotspotrc, &buf) == 0) { 3878 needs_hotspotrc_warning = true; 3879 } 3880 #endif 3881 } 3882 3883 if (PrintVMOptions) { 3884 for (index = 0; index < args->nOptions; index++) { 3885 const JavaVMOption *option = args->options + index; 3886 if (match_option(option, "-XX:", &tail)) { 3887 logOption(tail); 3888 } 3889 } 3890 } 3891 3892 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3893 jint result = parse_vm_init_args(args); 3894 if (result != JNI_OK) { 3895 return result; 3896 } 3897 3898 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3899 SharedArchivePath = get_shared_archive_path(); 3900 if (SharedArchivePath == NULL) { 3901 return JNI_ENOMEM; 3902 } 3903 3904 // Set up VerifySharedSpaces 3905 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3906 VerifySharedSpaces = true; 3907 } 3908 3909 // Delay warning until here so that we've had a chance to process 3910 // the -XX:-PrintWarnings flag 3911 if (needs_hotspotrc_warning) { 3912 warning("%s file is present but has been ignored. " 3913 "Run with -XX:Flags=%s to load the file.", 3914 hotspotrc, hotspotrc); 3915 } 3916 3917 #ifdef _ALLBSD_SOURCE // UseLargePages is not yet supported on BSD. 3918 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3919 #endif 3920 3921 #if INCLUDE_ALL_GCS 3922 #if (defined JAVASE_EMBEDDED || defined ARM) 3923 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3924 #endif 3925 #endif 3926 3927 #ifndef PRODUCT 3928 if (TraceBytecodesAt != 0) { 3929 TraceBytecodes = true; 3930 } 3931 if (CountCompiledCalls) { 3932 if (UseCounterDecay) { 3933 warning("UseCounterDecay disabled because CountCalls is set"); 3934 UseCounterDecay = false; 3935 } 3936 } 3937 #endif // PRODUCT 3938 3939 if (ScavengeRootsInCode == 0) { 3940 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3941 warning("forcing ScavengeRootsInCode non-zero"); 3942 } 3943 ScavengeRootsInCode = 1; 3944 } 3945 3946 if (PrintGCDetails) { 3947 // Turn on -verbose:gc options as well 3948 PrintGC = true; 3949 } 3950 3951 // Set object alignment values. 3952 set_object_alignment(); 3953 3954 #if !INCLUDE_ALL_GCS 3955 force_serial_gc(); 3956 #endif // INCLUDE_ALL_GCS 3957 #if !INCLUDE_CDS 3958 if (DumpSharedSpaces || RequireSharedSpaces) { 3959 jio_fprintf(defaultStream::error_stream(), 3960 "Shared spaces are not supported in this VM\n"); 3961 return JNI_ERR; 3962 } 3963 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3964 warning("Shared spaces are not supported in this VM"); 3965 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3966 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3967 } 3968 no_shared_spaces("CDS Disabled"); 3969 #endif // INCLUDE_CDS 3970 3971 return JNI_OK; 3972 } 3973 3974 jint Arguments::apply_ergo() { 3975 3976 // Set flags based on ergonomics. 3977 set_ergonomics_flags(); 3978 3979 set_shared_spaces_flags(); 3980 3981 // Check the GC selections again. 3982 if (!ArgumentsExt::check_gc_consistency_ergo()) { 3983 return JNI_EINVAL; 3984 } 3985 3986 if (TieredCompilation) { 3987 set_tiered_flags(); 3988 } else { 3989 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3990 if (CompilationPolicyChoice >= 2) { 3991 vm_exit_during_initialization( 3992 "Incompatible compilation policy selected", NULL); 3993 } 3994 // Scale CompileThreshold 3995 if (!FLAG_IS_DEFAULT(CompileThresholdScaling)) { 3996 FLAG_SET_ERGO(intx, CompileThreshold, get_scaled_compile_threshold(CompileThreshold)); 3997 } 3998 } 3999 4000 #ifdef COMPILER2 4001 #ifndef PRODUCT 4002 if (PrintIdealGraphLevel > 0) { 4003 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4004 } 4005 #endif 4006 #endif 4007 4008 // Set heap size based on available physical memory 4009 set_heap_size(); 4010 4011 ArgumentsExt::set_gc_specific_flags(); 4012 4013 // Initialize Metaspace flags and alignments 4014 Metaspace::ergo_initialize(); 4015 4016 // Set bytecode rewriting flags 4017 set_bytecode_flags(); 4018 4019 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4020 set_aggressive_opts_flags(); 4021 4022 // Turn off biased locking for locking debug mode flags, 4023 // which are subtly different from each other but neither works with 4024 // biased locking 4025 if (UseHeavyMonitors 4026 #ifdef COMPILER1 4027 || !UseFastLocking 4028 #endif // COMPILER1 4029 ) { 4030 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4031 // flag set to true on command line; warn the user that they 4032 // can't enable biased locking here 4033 warning("Biased Locking is not supported with locking debug flags" 4034 "; ignoring UseBiasedLocking flag." ); 4035 } 4036 UseBiasedLocking = false; 4037 } 4038 4039 #ifdef ZERO 4040 // Clear flags not supported on zero. 4041 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4042 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4043 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4044 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4045 #endif // CC_INTERP 4046 4047 #ifdef COMPILER2 4048 if (!EliminateLocks) { 4049 EliminateNestedLocks = false; 4050 } 4051 if (!Inline) { 4052 IncrementalInline = false; 4053 } 4054 #ifndef PRODUCT 4055 if (!IncrementalInline) { 4056 AlwaysIncrementalInline = false; 4057 } 4058 #endif 4059 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4060 // nothing to use the profiling, turn if off 4061 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4062 } 4063 #endif 4064 4065 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4066 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4067 DebugNonSafepoints = true; 4068 } 4069 4070 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4071 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4072 } 4073 4074 #ifndef PRODUCT 4075 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4076 if (use_vm_log()) { 4077 LogVMOutput = true; 4078 } 4079 } 4080 #endif // PRODUCT 4081 4082 if (PrintCommandLineFlags) { 4083 CommandLineFlags::printSetFlags(tty); 4084 } 4085 4086 // Apply CPU specific policy for the BiasedLocking 4087 if (UseBiasedLocking) { 4088 if (!VM_Version::use_biased_locking() && 4089 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4090 UseBiasedLocking = false; 4091 } 4092 } 4093 #ifdef COMPILER2 4094 if (!UseBiasedLocking || EmitSync != 0) { 4095 UseOptoBiasInlining = false; 4096 } 4097 #endif 4098 4099 return JNI_OK; 4100 } 4101 4102 jint Arguments::adjust_after_os() { 4103 if (UseNUMA) { 4104 if (UseParallelGC || UseParallelOldGC) { 4105 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4106 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4107 } 4108 } 4109 // UseNUMAInterleaving is set to ON for all collectors and 4110 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4111 // such as the parallel collector for Linux and Solaris will 4112 // interleave old gen and survivor spaces on top of NUMA 4113 // allocation policy for the eden space. 4114 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4115 // all platforms and ParallelGC on Windows will interleave all 4116 // of the heap spaces across NUMA nodes. 4117 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4118 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4119 } 4120 } 4121 return JNI_OK; 4122 } 4123 4124 int Arguments::PropertyList_count(SystemProperty* pl) { 4125 int count = 0; 4126 while(pl != NULL) { 4127 count++; 4128 pl = pl->next(); 4129 } 4130 return count; 4131 } 4132 4133 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4134 assert(key != NULL, "just checking"); 4135 SystemProperty* prop; 4136 for (prop = pl; prop != NULL; prop = prop->next()) { 4137 if (strcmp(key, prop->key()) == 0) return prop->value(); 4138 } 4139 return NULL; 4140 } 4141 4142 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4143 int count = 0; 4144 const char* ret_val = NULL; 4145 4146 while(pl != NULL) { 4147 if(count >= index) { 4148 ret_val = pl->key(); 4149 break; 4150 } 4151 count++; 4152 pl = pl->next(); 4153 } 4154 4155 return ret_val; 4156 } 4157 4158 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4159 int count = 0; 4160 char* ret_val = NULL; 4161 4162 while(pl != NULL) { 4163 if(count >= index) { 4164 ret_val = pl->value(); 4165 break; 4166 } 4167 count++; 4168 pl = pl->next(); 4169 } 4170 4171 return ret_val; 4172 } 4173 4174 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4175 SystemProperty* p = *plist; 4176 if (p == NULL) { 4177 *plist = new_p; 4178 } else { 4179 while (p->next() != NULL) { 4180 p = p->next(); 4181 } 4182 p->set_next(new_p); 4183 } 4184 } 4185 4186 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4187 if (plist == NULL) 4188 return; 4189 4190 SystemProperty* new_p = new SystemProperty(k, v, true); 4191 PropertyList_add(plist, new_p); 4192 } 4193 4194 // This add maintains unique property key in the list. 4195 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4196 if (plist == NULL) 4197 return; 4198 4199 // If property key exist then update with new value. 4200 SystemProperty* prop; 4201 for (prop = *plist; prop != NULL; prop = prop->next()) { 4202 if (strcmp(k, prop->key()) == 0) { 4203 if (append) { 4204 prop->append_value(v); 4205 } else { 4206 prop->set_value(v); 4207 } 4208 return; 4209 } 4210 } 4211 4212 PropertyList_add(plist, k, v); 4213 } 4214 4215 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4216 // Returns true if all of the source pointed by src has been copied over to 4217 // the destination buffer pointed by buf. Otherwise, returns false. 4218 // Notes: 4219 // 1. If the length (buflen) of the destination buffer excluding the 4220 // NULL terminator character is not long enough for holding the expanded 4221 // pid characters, it also returns false instead of returning the partially 4222 // expanded one. 4223 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4224 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4225 char* buf, size_t buflen) { 4226 const char* p = src; 4227 char* b = buf; 4228 const char* src_end = &src[srclen]; 4229 char* buf_end = &buf[buflen - 1]; 4230 4231 while (p < src_end && b < buf_end) { 4232 if (*p == '%') { 4233 switch (*(++p)) { 4234 case '%': // "%%" ==> "%" 4235 *b++ = *p++; 4236 break; 4237 case 'p': { // "%p" ==> current process id 4238 // buf_end points to the character before the last character so 4239 // that we could write '\0' to the end of the buffer. 4240 size_t buf_sz = buf_end - b + 1; 4241 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4242 4243 // if jio_snprintf fails or the buffer is not long enough to hold 4244 // the expanded pid, returns false. 4245 if (ret < 0 || ret >= (int)buf_sz) { 4246 return false; 4247 } else { 4248 b += ret; 4249 assert(*b == '\0', "fail in copy_expand_pid"); 4250 if (p == src_end && b == buf_end + 1) { 4251 // reach the end of the buffer. 4252 return true; 4253 } 4254 } 4255 p++; 4256 break; 4257 } 4258 default : 4259 *b++ = '%'; 4260 } 4261 } else { 4262 *b++ = *p++; 4263 } 4264 } 4265 *b = '\0'; 4266 return (p == src_end); // return false if not all of the source was copied 4267 }