1 /* 2 * Copyright (c) 1997, 2012, 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/javaAssertions.hpp" 27 #include "compiler/compilerOracle.hpp" 28 #include "memory/allocation.inline.hpp" 29 #include "memory/cardTableRS.hpp" 30 #include "memory/referenceProcessor.hpp" 31 #include "memory/universe.inline.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "prims/jvmtiExport.hpp" 34 #include "runtime/arguments.hpp" 35 #include "runtime/globals_extension.hpp" 36 #include "runtime/java.hpp" 37 #include "services/management.hpp" 38 #include "utilities/defaultStream.hpp" 39 #include "utilities/taskqueue.hpp" 40 #ifdef TARGET_OS_FAMILY_linux 41 # include "os_linux.inline.hpp" 42 #endif 43 #ifdef TARGET_OS_FAMILY_solaris 44 # include "os_solaris.inline.hpp" 45 #endif 46 #ifdef TARGET_OS_FAMILY_windows 47 # include "os_windows.inline.hpp" 48 #endif 49 #ifdef TARGET_OS_FAMILY_bsd 50 # include "os_bsd.inline.hpp" 51 #endif 52 #ifndef SERIALGC 53 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 54 #endif 55 56 // Note: This is a special bug reporting site for the JVM 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 58 #define DEFAULT_JAVA_LAUNCHER "generic" 59 60 char** Arguments::_jvm_flags_array = NULL; 61 int Arguments::_num_jvm_flags = 0; 62 char** Arguments::_jvm_args_array = NULL; 63 int Arguments::_num_jvm_args = 0; 64 char* Arguments::_java_command = NULL; 65 SystemProperty* Arguments::_system_properties = NULL; 66 const char* Arguments::_gc_log_filename = NULL; 67 bool Arguments::_has_profile = false; 68 bool Arguments::_has_alloc_profile = false; 69 uintx Arguments::_min_heap_size = 0; 70 Arguments::Mode Arguments::_mode = _mixed; 71 bool Arguments::_java_compiler = false; 72 bool Arguments::_xdebug_mode = false; 73 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 74 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 75 int Arguments::_sun_java_launcher_pid = -1; 76 bool Arguments::_created_by_gamma_launcher = false; 77 78 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 79 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 80 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 81 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 82 bool Arguments::_ClipInlining = ClipInlining; 83 84 char* Arguments::SharedArchivePath = NULL; 85 86 AgentLibraryList Arguments::_libraryList; 87 AgentLibraryList Arguments::_agentList; 88 89 abort_hook_t Arguments::_abort_hook = NULL; 90 exit_hook_t Arguments::_exit_hook = NULL; 91 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 92 93 94 SystemProperty *Arguments::_java_ext_dirs = NULL; 95 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 96 SystemProperty *Arguments::_sun_boot_library_path = NULL; 97 SystemProperty *Arguments::_java_library_path = NULL; 98 SystemProperty *Arguments::_java_home = NULL; 99 SystemProperty *Arguments::_java_class_path = NULL; 100 SystemProperty *Arguments::_sun_boot_class_path = NULL; 101 102 char* Arguments::_meta_index_path = NULL; 103 char* Arguments::_meta_index_dir = NULL; 104 105 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 106 107 static bool match_option(const JavaVMOption *option, const char* name, 108 const char** tail) { 109 int len = (int)strlen(name); 110 if (strncmp(option->optionString, name, len) == 0) { 111 *tail = option->optionString + len; 112 return true; 113 } else { 114 return false; 115 } 116 } 117 118 static void logOption(const char* opt) { 119 if (PrintVMOptions) { 120 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 121 } 122 } 123 124 // Process java launcher properties. 125 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 126 // See if sun.java.launcher or sun.java.launcher.pid is defined. 127 // Must do this before setting up other system properties, 128 // as some of them may depend on launcher type. 129 for (int index = 0; index < args->nOptions; index++) { 130 const JavaVMOption* option = args->options + index; 131 const char* tail; 132 133 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 134 process_java_launcher_argument(tail, option->extraInfo); 135 continue; 136 } 137 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 138 _sun_java_launcher_pid = atoi(tail); 139 continue; 140 } 141 } 142 } 143 144 // Initialize system properties key and value. 145 void Arguments::init_system_properties() { 146 147 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 148 "Java Virtual Machine Specification", false)); 149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 150 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 152 153 // following are JVMTI agent writeable properties. 154 // Properties values are set to NULL and they are 155 // os specific they are initialized in os::init_system_properties_values(). 156 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 157 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 158 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 159 _java_library_path = new SystemProperty("java.library.path", NULL, true); 160 _java_home = new SystemProperty("java.home", NULL, true); 161 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 162 163 _java_class_path = new SystemProperty("java.class.path", "", true); 164 165 // Add to System Property list. 166 PropertyList_add(&_system_properties, _java_ext_dirs); 167 PropertyList_add(&_system_properties, _java_endorsed_dirs); 168 PropertyList_add(&_system_properties, _sun_boot_library_path); 169 PropertyList_add(&_system_properties, _java_library_path); 170 PropertyList_add(&_system_properties, _java_home); 171 PropertyList_add(&_system_properties, _java_class_path); 172 PropertyList_add(&_system_properties, _sun_boot_class_path); 173 174 // Set OS specific system properties values 175 os::init_system_properties_values(); 176 } 177 178 179 // Update/Initialize System properties after JDK version number is known 180 void Arguments::init_version_specific_system_properties() { 181 enum { bufsz = 16 }; 182 char buffer[bufsz]; 183 const char* spec_vendor = "Sun Microsystems Inc."; 184 uint32_t spec_version = 0; 185 186 if (JDK_Version::is_gte_jdk17x_version()) { 187 spec_vendor = "Oracle Corporation"; 188 spec_version = JDK_Version::current().major_version(); 189 } 190 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 191 192 PropertyList_add(&_system_properties, 193 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 194 PropertyList_add(&_system_properties, 195 new SystemProperty("java.vm.specification.version", buffer, false)); 196 PropertyList_add(&_system_properties, 197 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 198 } 199 200 /** 201 * Provide a slightly more user-friendly way of eliminating -XX flags. 202 * When a flag is eliminated, it can be added to this list in order to 203 * continue accepting this flag on the command-line, while issuing a warning 204 * and ignoring the value. Once the JDK version reaches the 'accept_until' 205 * limit, we flatly refuse to admit the existence of the flag. This allows 206 * a flag to die correctly over JDK releases using HSX. 207 */ 208 typedef struct { 209 const char* name; 210 JDK_Version obsoleted_in; // when the flag went away 211 JDK_Version accept_until; // which version to start denying the existence 212 } ObsoleteFlag; 213 214 static ObsoleteFlag obsolete_jvm_flags[] = { 215 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 216 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 217 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 218 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 229 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 230 { "DefaultInitialRAMFraction", 231 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 232 { "UseDepthFirstScavengeOrder", 233 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 234 { "HandlePromotionFailure", 235 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 236 { "MaxLiveObjectEvacuationRatio", 237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 238 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 239 { "UseParallelOldGCCompacting", 240 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 241 { "UseParallelDensePrefixUpdate", 242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 243 { "UseParallelOldGCDensePrefix", 244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 245 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 246 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 247 #ifdef PRODUCT 248 { "DesiredMethodLimit", 249 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 250 #endif // PRODUCT 251 { NULL, JDK_Version(0), JDK_Version(0) } 252 }; 253 254 // Returns true if the flag is obsolete and fits into the range specified 255 // for being ignored. In the case that the flag is ignored, the 'version' 256 // value is filled in with the version number when the flag became 257 // obsolete so that that value can be displayed to the user. 258 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 259 int i = 0; 260 assert(version != NULL, "Must provide a version buffer"); 261 while (obsolete_jvm_flags[i].name != NULL) { 262 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 263 // <flag>=xxx form 264 // [-|+]<flag> form 265 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 266 ((s[0] == '+' || s[0] == '-') && 267 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 268 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 269 *version = flag_status.obsoleted_in; 270 return true; 271 } 272 } 273 i++; 274 } 275 return false; 276 } 277 278 // Constructs the system class path (aka boot class path) from the following 279 // components, in order: 280 // 281 // prefix // from -Xbootclasspath/p:... 282 // endorsed // the expansion of -Djava.endorsed.dirs=... 283 // base // from os::get_system_properties() or -Xbootclasspath= 284 // suffix // from -Xbootclasspath/a:... 285 // 286 // java.endorsed.dirs is a list of directories; any jar or zip files in the 287 // directories are added to the sysclasspath just before the base. 288 // 289 // This could be AllStatic, but it isn't needed after argument processing is 290 // complete. 291 class SysClassPath: public StackObj { 292 public: 293 SysClassPath(const char* base); 294 ~SysClassPath(); 295 296 inline void set_base(const char* base); 297 inline void add_prefix(const char* prefix); 298 inline void add_suffix_to_prefix(const char* suffix); 299 inline void add_suffix(const char* suffix); 300 inline void reset_path(const char* base); 301 302 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 303 // property. Must be called after all command-line arguments have been 304 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 305 // combined_path(). 306 void expand_endorsed(); 307 308 inline const char* get_base() const { return _items[_scp_base]; } 309 inline const char* get_prefix() const { return _items[_scp_prefix]; } 310 inline const char* get_suffix() const { return _items[_scp_suffix]; } 311 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 312 313 // Combine all the components into a single c-heap-allocated string; caller 314 // must free the string if/when no longer needed. 315 char* combined_path(); 316 317 private: 318 // Utility routines. 319 static char* add_to_path(const char* path, const char* str, bool prepend); 320 static char* add_jars_to_path(char* path, const char* directory); 321 322 inline void reset_item_at(int index); 323 324 // Array indices for the items that make up the sysclasspath. All except the 325 // base are allocated in the C heap and freed by this class. 326 enum { 327 _scp_prefix, // from -Xbootclasspath/p:... 328 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 329 _scp_base, // the default sysclasspath 330 _scp_suffix, // from -Xbootclasspath/a:... 331 _scp_nitems // the number of items, must be last. 332 }; 333 334 const char* _items[_scp_nitems]; 335 DEBUG_ONLY(bool _expansion_done;) 336 }; 337 338 SysClassPath::SysClassPath(const char* base) { 339 memset(_items, 0, sizeof(_items)); 340 _items[_scp_base] = base; 341 DEBUG_ONLY(_expansion_done = false;) 342 } 343 344 SysClassPath::~SysClassPath() { 345 // Free everything except the base. 346 for (int i = 0; i < _scp_nitems; ++i) { 347 if (i != _scp_base) reset_item_at(i); 348 } 349 DEBUG_ONLY(_expansion_done = false;) 350 } 351 352 inline void SysClassPath::set_base(const char* base) { 353 _items[_scp_base] = base; 354 } 355 356 inline void SysClassPath::add_prefix(const char* prefix) { 357 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 358 } 359 360 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 361 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 362 } 363 364 inline void SysClassPath::add_suffix(const char* suffix) { 365 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 366 } 367 368 inline void SysClassPath::reset_item_at(int index) { 369 assert(index < _scp_nitems && index != _scp_base, "just checking"); 370 if (_items[index] != NULL) { 371 FREE_C_HEAP_ARRAY(char, _items[index]); 372 _items[index] = NULL; 373 } 374 } 375 376 inline void SysClassPath::reset_path(const char* base) { 377 // Clear the prefix and suffix. 378 reset_item_at(_scp_prefix); 379 reset_item_at(_scp_suffix); 380 set_base(base); 381 } 382 383 //------------------------------------------------------------------------------ 384 385 void SysClassPath::expand_endorsed() { 386 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 387 388 const char* path = Arguments::get_property("java.endorsed.dirs"); 389 if (path == NULL) { 390 path = Arguments::get_endorsed_dir(); 391 assert(path != NULL, "no default for java.endorsed.dirs"); 392 } 393 394 char* expanded_path = NULL; 395 const char separator = *os::path_separator(); 396 const char* const end = path + strlen(path); 397 while (path < end) { 398 const char* tmp_end = strchr(path, separator); 399 if (tmp_end == NULL) { 400 expanded_path = add_jars_to_path(expanded_path, path); 401 path = end; 402 } else { 403 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1); 404 memcpy(dirpath, path, tmp_end - path); 405 dirpath[tmp_end - path] = '\0'; 406 expanded_path = add_jars_to_path(expanded_path, dirpath); 407 FREE_C_HEAP_ARRAY(char, dirpath); 408 path = tmp_end + 1; 409 } 410 } 411 _items[_scp_endorsed] = expanded_path; 412 DEBUG_ONLY(_expansion_done = true;) 413 } 414 415 // Combine the bootclasspath elements, some of which may be null, into a single 416 // c-heap-allocated string. 417 char* SysClassPath::combined_path() { 418 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 419 assert(_expansion_done, "must call expand_endorsed() first."); 420 421 size_t lengths[_scp_nitems]; 422 size_t total_len = 0; 423 424 const char separator = *os::path_separator(); 425 426 // Get the lengths. 427 int i; 428 for (i = 0; i < _scp_nitems; ++i) { 429 if (_items[i] != NULL) { 430 lengths[i] = strlen(_items[i]); 431 // Include space for the separator char (or a NULL for the last item). 432 total_len += lengths[i] + 1; 433 } 434 } 435 assert(total_len > 0, "empty sysclasspath not allowed"); 436 437 // Copy the _items to a single string. 438 char* cp = NEW_C_HEAP_ARRAY(char, total_len); 439 char* cp_tmp = cp; 440 for (i = 0; i < _scp_nitems; ++i) { 441 if (_items[i] != NULL) { 442 memcpy(cp_tmp, _items[i], lengths[i]); 443 cp_tmp += lengths[i]; 444 *cp_tmp++ = separator; 445 } 446 } 447 *--cp_tmp = '\0'; // Replace the extra separator. 448 return cp; 449 } 450 451 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 452 char* 453 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 454 char *cp; 455 456 assert(str != NULL, "just checking"); 457 if (path == NULL) { 458 size_t len = strlen(str) + 1; 459 cp = NEW_C_HEAP_ARRAY(char, len); 460 memcpy(cp, str, len); // copy the trailing null 461 } else { 462 const char separator = *os::path_separator(); 463 size_t old_len = strlen(path); 464 size_t str_len = strlen(str); 465 size_t len = old_len + str_len + 2; 466 467 if (prepend) { 468 cp = NEW_C_HEAP_ARRAY(char, len); 469 char* cp_tmp = cp; 470 memcpy(cp_tmp, str, str_len); 471 cp_tmp += str_len; 472 *cp_tmp = separator; 473 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 474 FREE_C_HEAP_ARRAY(char, path); 475 } else { 476 cp = REALLOC_C_HEAP_ARRAY(char, path, len); 477 char* cp_tmp = cp + old_len; 478 *cp_tmp = separator; 479 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 480 } 481 } 482 return cp; 483 } 484 485 // Scan the directory and append any jar or zip files found to path. 486 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 487 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 488 DIR* dir = os::opendir(directory); 489 if (dir == NULL) return path; 490 491 char dir_sep[2] = { '\0', '\0' }; 492 size_t directory_len = strlen(directory); 493 const char fileSep = *os::file_separator(); 494 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 495 496 /* Scan the directory for jars/zips, appending them to path. */ 497 struct dirent *entry; 498 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory)); 499 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 500 const char* name = entry->d_name; 501 const char* ext = name + strlen(name) - 4; 502 bool isJarOrZip = ext > name && 503 (os::file_name_strcmp(ext, ".jar") == 0 || 504 os::file_name_strcmp(ext, ".zip") == 0); 505 if (isJarOrZip) { 506 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name)); 507 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 508 path = add_to_path(path, jarpath, false); 509 FREE_C_HEAP_ARRAY(char, jarpath); 510 } 511 } 512 FREE_C_HEAP_ARRAY(char, dbuf); 513 os::closedir(dir); 514 return path; 515 } 516 517 // Parses a memory size specification string. 518 static bool atomull(const char *s, julong* result) { 519 julong n = 0; 520 int args_read = sscanf(s, os::julong_format_specifier(), &n); 521 if (args_read != 1) { 522 return false; 523 } 524 while (*s != '\0' && isdigit(*s)) { 525 s++; 526 } 527 // 4705540: illegal if more characters are found after the first non-digit 528 if (strlen(s) > 1) { 529 return false; 530 } 531 switch (*s) { 532 case 'T': case 't': 533 *result = n * G * K; 534 // Check for overflow. 535 if (*result/((julong)G * K) != n) return false; 536 return true; 537 case 'G': case 'g': 538 *result = n * G; 539 if (*result/G != n) return false; 540 return true; 541 case 'M': case 'm': 542 *result = n * M; 543 if (*result/M != n) return false; 544 return true; 545 case 'K': case 'k': 546 *result = n * K; 547 if (*result/K != n) return false; 548 return true; 549 case '\0': 550 *result = n; 551 return true; 552 default: 553 return false; 554 } 555 } 556 557 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 558 if (size < min_size) return arg_too_small; 559 // Check that size will fit in a size_t (only relevant on 32-bit) 560 if (size > max_uintx) return arg_too_big; 561 return arg_in_range; 562 } 563 564 // Describe an argument out of range error 565 void Arguments::describe_range_error(ArgsRange errcode) { 566 switch(errcode) { 567 case arg_too_big: 568 jio_fprintf(defaultStream::error_stream(), 569 "The specified size exceeds the maximum " 570 "representable size.\n"); 571 break; 572 case arg_too_small: 573 case arg_unreadable: 574 case arg_in_range: 575 // do nothing for now 576 break; 577 default: 578 ShouldNotReachHere(); 579 } 580 } 581 582 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 583 return CommandLineFlags::boolAtPut(name, &value, origin); 584 } 585 586 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 587 double v; 588 if (sscanf(value, "%lf", &v) != 1) { 589 return false; 590 } 591 592 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 593 return true; 594 } 595 return false; 596 } 597 598 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 599 julong v; 600 intx intx_v; 601 bool is_neg = false; 602 // Check the sign first since atomull() parses only unsigned values. 603 if (*value == '-') { 604 if (!CommandLineFlags::intxAt(name, &intx_v)) { 605 return false; 606 } 607 value++; 608 is_neg = true; 609 } 610 if (!atomull(value, &v)) { 611 return false; 612 } 613 intx_v = (intx) v; 614 if (is_neg) { 615 intx_v = -intx_v; 616 } 617 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 618 return true; 619 } 620 uintx uintx_v = (uintx) v; 621 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 622 return true; 623 } 624 uint64_t uint64_t_v = (uint64_t) v; 625 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 626 return true; 627 } 628 return false; 629 } 630 631 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 632 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 633 // Contract: CommandLineFlags always returns a pointer that needs freeing. 634 FREE_C_HEAP_ARRAY(char, value); 635 return true; 636 } 637 638 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 639 const char* old_value = ""; 640 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 641 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 642 size_t new_len = strlen(new_value); 643 const char* value; 644 char* free_this_too = NULL; 645 if (old_len == 0) { 646 value = new_value; 647 } else if (new_len == 0) { 648 value = old_value; 649 } else { 650 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1); 651 // each new setting adds another LINE to the switch: 652 sprintf(buf, "%s\n%s", old_value, new_value); 653 value = buf; 654 free_this_too = buf; 655 } 656 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 657 // CommandLineFlags always returns a pointer that needs freeing. 658 FREE_C_HEAP_ARRAY(char, value); 659 if (free_this_too != NULL) { 660 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 661 FREE_C_HEAP_ARRAY(char, free_this_too); 662 } 663 return true; 664 } 665 666 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 667 668 // range of acceptable characters spelled out for portability reasons 669 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 670 #define BUFLEN 255 671 char name[BUFLEN+1]; 672 char dummy; 673 674 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 675 return set_bool_flag(name, false, origin); 676 } 677 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 678 return set_bool_flag(name, true, origin); 679 } 680 681 char punct; 682 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 683 const char* value = strchr(arg, '=') + 1; 684 Flag* flag = Flag::find_flag(name, strlen(name)); 685 if (flag != NULL && flag->is_ccstr()) { 686 if (flag->ccstr_accumulates()) { 687 return append_to_string_flag(name, value, origin); 688 } else { 689 if (value[0] == '\0') { 690 value = NULL; 691 } 692 return set_string_flag(name, value, origin); 693 } 694 } 695 } 696 697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 698 const char* value = strchr(arg, '=') + 1; 699 // -XX:Foo:=xxx will reset the string flag to the given value. 700 if (value[0] == '\0') { 701 value = NULL; 702 } 703 return set_string_flag(name, value, origin); 704 } 705 706 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 707 #define SIGNED_NUMBER_RANGE "[-0123456789]" 708 #define NUMBER_RANGE "[0123456789]" 709 char value[BUFLEN + 1]; 710 char value2[BUFLEN + 1]; 711 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 712 // Looks like a floating-point number -- try again with more lenient format string 713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 714 return set_fp_numeric_flag(name, value, origin); 715 } 716 } 717 718 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 719 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 720 return set_numeric_flag(name, value, origin); 721 } 722 723 return false; 724 } 725 726 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 727 assert(bldarray != NULL, "illegal argument"); 728 729 if (arg == NULL) { 730 return; 731 } 732 733 int index = *count; 734 735 // expand the array and add arg to the last element 736 (*count)++; 737 if (*bldarray == NULL) { 738 *bldarray = NEW_C_HEAP_ARRAY(char*, *count); 739 } else { 740 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count); 741 } 742 (*bldarray)[index] = strdup(arg); 743 } 744 745 void Arguments::build_jvm_args(const char* arg) { 746 add_string(&_jvm_args_array, &_num_jvm_args, arg); 747 } 748 749 void Arguments::build_jvm_flags(const char* arg) { 750 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 751 } 752 753 // utility function to return a string that concatenates all 754 // strings in a given char** array 755 const char* Arguments::build_resource_string(char** args, int count) { 756 if (args == NULL || count == 0) { 757 return NULL; 758 } 759 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 760 for (int i = 1; i < count; i++) { 761 length += strlen(args[i]) + 1; // add 1 for a space 762 } 763 char* s = NEW_RESOURCE_ARRAY(char, length); 764 strcpy(s, args[0]); 765 for (int j = 1; j < count; j++) { 766 strcat(s, " "); 767 strcat(s, args[j]); 768 } 769 return (const char*) s; 770 } 771 772 void Arguments::print_on(outputStream* st) { 773 st->print_cr("VM Arguments:"); 774 if (num_jvm_flags() > 0) { 775 st->print("jvm_flags: "); print_jvm_flags_on(st); 776 } 777 if (num_jvm_args() > 0) { 778 st->print("jvm_args: "); print_jvm_args_on(st); 779 } 780 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 781 st->print_cr("Launcher Type: %s", _sun_java_launcher); 782 } 783 784 void Arguments::print_jvm_flags_on(outputStream* st) { 785 if (_num_jvm_flags > 0) { 786 for (int i=0; i < _num_jvm_flags; i++) { 787 st->print("%s ", _jvm_flags_array[i]); 788 } 789 st->print_cr(""); 790 } 791 } 792 793 void Arguments::print_jvm_args_on(outputStream* st) { 794 if (_num_jvm_args > 0) { 795 for (int i=0; i < _num_jvm_args; i++) { 796 st->print("%s ", _jvm_args_array[i]); 797 } 798 st->print_cr(""); 799 } 800 } 801 802 bool Arguments::process_argument(const char* arg, 803 jboolean ignore_unrecognized, FlagValueOrigin origin) { 804 805 JDK_Version since = JDK_Version(); 806 807 if (parse_argument(arg, origin) || ignore_unrecognized) { 808 return true; 809 } 810 811 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg; 812 if (is_newly_obsolete(arg, &since)) { 813 char version[256]; 814 since.to_string(version, sizeof(version)); 815 warning("ignoring option %s; support was removed in %s", argname, version); 816 return true; 817 } 818 819 jio_fprintf(defaultStream::error_stream(), 820 "Unrecognized VM option '%s'\n", argname); 821 // allow for commandline "commenting out" options like -XX:#+Verbose 822 return arg[0] == '#'; 823 } 824 825 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 826 FILE* stream = fopen(file_name, "rb"); 827 if (stream == NULL) { 828 if (should_exist) { 829 jio_fprintf(defaultStream::error_stream(), 830 "Could not open settings file %s\n", file_name); 831 return false; 832 } else { 833 return true; 834 } 835 } 836 837 char token[1024]; 838 int pos = 0; 839 840 bool in_white_space = true; 841 bool in_comment = false; 842 bool in_quote = false; 843 char quote_c = 0; 844 bool result = true; 845 846 int c = getc(stream); 847 while(c != EOF) { 848 if (in_white_space) { 849 if (in_comment) { 850 if (c == '\n') in_comment = false; 851 } else { 852 if (c == '#') in_comment = true; 853 else if (!isspace(c)) { 854 in_white_space = false; 855 token[pos++] = c; 856 } 857 } 858 } else { 859 if (c == '\n' || (!in_quote && isspace(c))) { 860 // token ends at newline, or at unquoted whitespace 861 // this allows a way to include spaces in string-valued options 862 token[pos] = '\0'; 863 logOption(token); 864 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 865 build_jvm_flags(token); 866 pos = 0; 867 in_white_space = true; 868 in_quote = false; 869 } else if (!in_quote && (c == '\'' || c == '"')) { 870 in_quote = true; 871 quote_c = c; 872 } else if (in_quote && (c == quote_c)) { 873 in_quote = false; 874 } else { 875 token[pos++] = c; 876 } 877 } 878 c = getc(stream); 879 } 880 if (pos > 0) { 881 token[pos] = '\0'; 882 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 883 build_jvm_flags(token); 884 } 885 fclose(stream); 886 return result; 887 } 888 889 //============================================================================================================= 890 // Parsing of properties (-D) 891 892 const char* Arguments::get_property(const char* key) { 893 return PropertyList_get_value(system_properties(), key); 894 } 895 896 bool Arguments::add_property(const char* prop) { 897 const char* eq = strchr(prop, '='); 898 char* key; 899 // ns must be static--its address may be stored in a SystemProperty object. 900 const static char ns[1] = {0}; 901 char* value = (char *)ns; 902 903 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 904 key = AllocateHeap(key_len + 1, "add_property"); 905 strncpy(key, prop, key_len); 906 key[key_len] = '\0'; 907 908 if (eq != NULL) { 909 size_t value_len = strlen(prop) - key_len - 1; 910 value = AllocateHeap(value_len + 1, "add_property"); 911 strncpy(value, &prop[key_len + 1], value_len + 1); 912 } 913 914 if (strcmp(key, "java.compiler") == 0) { 915 process_java_compiler_argument(value); 916 FreeHeap(key); 917 if (eq != NULL) { 918 FreeHeap(value); 919 } 920 return true; 921 } else if (strcmp(key, "sun.java.command") == 0) { 922 _java_command = value; 923 924 // Record value in Arguments, but let it get passed to Java. 925 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 926 // launcher.pid property is private and is processed 927 // in process_sun_java_launcher_properties(); 928 // the sun.java.launcher property is passed on to the java application 929 FreeHeap(key); 930 if (eq != NULL) { 931 FreeHeap(value); 932 } 933 return true; 934 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 935 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 936 // its value without going through the property list or making a Java call. 937 _java_vendor_url_bug = value; 938 } else if (strcmp(key, "sun.boot.library.path") == 0) { 939 PropertyList_unique_add(&_system_properties, key, value, true); 940 return true; 941 } 942 // Create new property and add at the end of the list 943 PropertyList_unique_add(&_system_properties, key, value); 944 return true; 945 } 946 947 //=========================================================================================================== 948 // Setting int/mixed/comp mode flags 949 950 void Arguments::set_mode_flags(Mode mode) { 951 // Set up default values for all flags. 952 // If you add a flag to any of the branches below, 953 // add a default value for it here. 954 set_java_compiler(false); 955 _mode = mode; 956 957 // Ensure Agent_OnLoad has the correct initial values. 958 // This may not be the final mode; mode may change later in onload phase. 959 PropertyList_unique_add(&_system_properties, "java.vm.info", 960 (char*)VM_Version::vm_info_string(), false); 961 962 UseInterpreter = true; 963 UseCompiler = true; 964 UseLoopCounter = true; 965 966 #ifndef ZERO 967 // Turn these off for mixed and comp. Leave them on for Zero. 968 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 969 UseFastAccessorMethods = (mode == _int); 970 } 971 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 972 UseFastEmptyMethods = (mode == _int); 973 } 974 #endif 975 976 // Default values may be platform/compiler dependent - 977 // use the saved values 978 ClipInlining = Arguments::_ClipInlining; 979 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 980 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 981 BackgroundCompilation = Arguments::_BackgroundCompilation; 982 983 // Change from defaults based on mode 984 switch (mode) { 985 default: 986 ShouldNotReachHere(); 987 break; 988 case _int: 989 UseCompiler = false; 990 UseLoopCounter = false; 991 AlwaysCompileLoopMethods = false; 992 UseOnStackReplacement = false; 993 break; 994 case _mixed: 995 // same as default 996 break; 997 case _comp: 998 UseInterpreter = false; 999 BackgroundCompilation = false; 1000 ClipInlining = false; 1001 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1002 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1003 // compile a level 4 (C2) and then continue executing it. 1004 if (TieredCompilation) { 1005 Tier3InvokeNotifyFreqLog = 0; 1006 Tier4InvocationThreshold = 0; 1007 } 1008 break; 1009 } 1010 } 1011 1012 // Conflict: required to use shared spaces (-Xshare:on), but 1013 // incompatible command line options were chosen. 1014 1015 static void no_shared_spaces() { 1016 if (RequireSharedSpaces) { 1017 jio_fprintf(defaultStream::error_stream(), 1018 "Class data sharing is inconsistent with other specified options.\n"); 1019 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1020 } else { 1021 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1022 } 1023 } 1024 1025 void Arguments::set_tiered_flags() { 1026 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1027 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1028 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1029 } 1030 if (CompilationPolicyChoice < 2) { 1031 vm_exit_during_initialization( 1032 "Incompatible compilation policy selected", NULL); 1033 } 1034 // Increase the code cache size - tiered compiles a lot more. 1035 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1036 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1037 } 1038 } 1039 1040 #ifndef KERNEL 1041 static void disable_adaptive_size_policy(const char* collector_name) { 1042 if (UseAdaptiveSizePolicy) { 1043 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1044 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1045 collector_name); 1046 } 1047 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1048 } 1049 } 1050 1051 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 1052 // if it's not explictly set or unset. If the user has chosen 1053 // UseParNewGC and not explicitly set ParallelGCThreads we 1054 // set it, unless this is a single cpu machine. 1055 void Arguments::set_parnew_gc_flags() { 1056 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1057 "control point invariant"); 1058 assert(UseParNewGC, "Error"); 1059 1060 // Turn off AdaptiveSizePolicy for parnew until it is complete. 1061 disable_adaptive_size_policy("UseParNewGC"); 1062 1063 if (ParallelGCThreads == 0) { 1064 FLAG_SET_DEFAULT(ParallelGCThreads, 1065 Abstract_VM_Version::parallel_worker_threads()); 1066 if (ParallelGCThreads == 1) { 1067 FLAG_SET_DEFAULT(UseParNewGC, false); 1068 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 1069 } 1070 } 1071 if (UseParNewGC) { 1072 // CDS doesn't work with ParNew yet 1073 no_shared_spaces(); 1074 1075 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1076 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1077 // we set them to 1024 and 1024. 1078 // See CR 6362902. 1079 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1080 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1081 } 1082 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1083 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1084 } 1085 1086 // AlwaysTenure flag should make ParNew promote all at first collection. 1087 // See CR 6362902. 1088 if (AlwaysTenure) { 1089 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 1090 } 1091 // When using compressed oops, we use local overflow stacks, 1092 // rather than using a global overflow list chained through 1093 // the klass word of the object's pre-image. 1094 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1095 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1096 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1097 } 1098 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1099 } 1100 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1101 } 1102 } 1103 1104 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1105 // sparc/solaris for certain applications, but would gain from 1106 // further optimization and tuning efforts, and would almost 1107 // certainly gain from analysis of platform and environment. 1108 void Arguments::set_cms_and_parnew_gc_flags() { 1109 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1110 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1111 1112 // If we are using CMS, we prefer to UseParNewGC, 1113 // unless explicitly forbidden. 1114 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1115 FLAG_SET_ERGO(bool, UseParNewGC, true); 1116 } 1117 1118 // Turn off AdaptiveSizePolicy for CMS until it is complete. 1119 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1120 1121 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1122 // as needed. 1123 if (UseParNewGC) { 1124 set_parnew_gc_flags(); 1125 } 1126 1127 // MaxHeapSize is aligned down in collectorPolicy 1128 size_t max_heap = align_size_down(MaxHeapSize, 1129 CardTableRS::ct_max_alignment_constraint()); 1130 1131 // Now make adjustments for CMS 1132 intx tenuring_default = (intx)6; 1133 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1134 1135 // Preferred young gen size for "short" pauses: 1136 // upper bound depends on # of threads and NewRatio. 1137 const uintx parallel_gc_threads = 1138 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1139 const size_t preferred_max_new_size_unaligned = 1140 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1141 size_t preferred_max_new_size = 1142 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1143 1144 // Unless explicitly requested otherwise, size young gen 1145 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1146 1147 // If either MaxNewSize or NewRatio is set on the command line, 1148 // assume the user is trying to set the size of the young gen. 1149 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1150 1151 // Set MaxNewSize to our calculated preferred_max_new_size unless 1152 // NewSize was set on the command line and it is larger than 1153 // preferred_max_new_size. 1154 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1155 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1156 } else { 1157 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1158 } 1159 if (PrintGCDetails && Verbose) { 1160 // Too early to use gclog_or_tty 1161 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1162 } 1163 1164 // Code along this path potentially sets NewSize and OldSize 1165 1166 assert(max_heap >= InitialHeapSize, "Error"); 1167 assert(max_heap >= NewSize, "Error"); 1168 1169 if (PrintGCDetails && Verbose) { 1170 // Too early to use gclog_or_tty 1171 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1172 " initial_heap_size: " SIZE_FORMAT 1173 " max_heap: " SIZE_FORMAT, 1174 min_heap_size(), InitialHeapSize, max_heap); 1175 } 1176 size_t min_new = preferred_max_new_size; 1177 if (FLAG_IS_CMDLINE(NewSize)) { 1178 min_new = NewSize; 1179 } 1180 if (max_heap > min_new && min_heap_size() > min_new) { 1181 // Unless explicitly requested otherwise, make young gen 1182 // at least min_new, and at most preferred_max_new_size. 1183 if (FLAG_IS_DEFAULT(NewSize)) { 1184 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1185 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1186 if (PrintGCDetails && Verbose) { 1187 // Too early to use gclog_or_tty 1188 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1189 } 1190 } 1191 // Unless explicitly requested otherwise, size old gen 1192 // so it's NewRatio x of NewSize. 1193 if (FLAG_IS_DEFAULT(OldSize)) { 1194 if (max_heap > NewSize) { 1195 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1196 if (PrintGCDetails && Verbose) { 1197 // Too early to use gclog_or_tty 1198 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1199 } 1200 } 1201 } 1202 } 1203 } 1204 // Unless explicitly requested otherwise, definitely 1205 // promote all objects surviving "tenuring_default" scavenges. 1206 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1207 FLAG_IS_DEFAULT(SurvivorRatio)) { 1208 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1209 } 1210 // If we decided above (or user explicitly requested) 1211 // `promote all' (via MaxTenuringThreshold := 0), 1212 // prefer minuscule survivor spaces so as not to waste 1213 // space for (non-existent) survivors 1214 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1215 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1216 } 1217 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1218 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1219 // This is done in order to make ParNew+CMS configuration to work 1220 // with YoungPLABSize and OldPLABSize options. 1221 // See CR 6362902. 1222 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1223 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1224 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1225 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1226 // the value (either from the command line or ergonomics) of 1227 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1228 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1229 } else { 1230 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1231 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1232 // we'll let it to take precedence. 1233 jio_fprintf(defaultStream::error_stream(), 1234 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1235 " options are specified for the CMS collector." 1236 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1237 } 1238 } 1239 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1240 // OldPLAB sizing manually turned off: Use a larger default setting, 1241 // unless it was manually specified. This is because a too-low value 1242 // will slow down scavenges. 1243 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1244 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1245 } 1246 } 1247 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1248 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1249 // If either of the static initialization defaults have changed, note this 1250 // modification. 1251 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1252 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1253 } 1254 if (PrintGCDetails && Verbose) { 1255 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1256 MarkStackSize / K, MarkStackSizeMax / K); 1257 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1258 } 1259 } 1260 #endif // KERNEL 1261 1262 void set_object_alignment() { 1263 // Object alignment. 1264 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1265 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1266 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1267 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1268 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1269 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1270 1271 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1272 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1273 1274 // Oop encoding heap max 1275 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1276 1277 #ifndef KERNEL 1278 // Set CMS global values 1279 CompactibleFreeListSpace::set_cms_values(); 1280 #endif // KERNEL 1281 } 1282 1283 bool verify_object_alignment() { 1284 // Object alignment. 1285 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1286 jio_fprintf(defaultStream::error_stream(), 1287 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1288 (int)ObjectAlignmentInBytes); 1289 return false; 1290 } 1291 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1292 jio_fprintf(defaultStream::error_stream(), 1293 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1294 (int)ObjectAlignmentInBytes, BytesPerLong); 1295 return false; 1296 } 1297 // It does not make sense to have big object alignment 1298 // since a space lost due to alignment will be greater 1299 // then a saved space from compressed oops. 1300 if ((int)ObjectAlignmentInBytes > 256) { 1301 jio_fprintf(defaultStream::error_stream(), 1302 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n", 1303 (int)ObjectAlignmentInBytes); 1304 return false; 1305 } 1306 // In case page size is very small. 1307 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1308 jio_fprintf(defaultStream::error_stream(), 1309 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n", 1310 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1311 return false; 1312 } 1313 return true; 1314 } 1315 1316 inline uintx max_heap_for_compressed_oops() { 1317 // Avoid sign flip. 1318 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) { 1319 return 0; 1320 } 1321 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1322 NOT_LP64(ShouldNotReachHere(); return 0); 1323 } 1324 1325 bool Arguments::should_auto_select_low_pause_collector() { 1326 if (UseAutoGCSelectPolicy && 1327 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1328 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1329 if (PrintGCDetails) { 1330 // Cannot use gclog_or_tty yet. 1331 tty->print_cr("Automatic selection of the low pause collector" 1332 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1333 } 1334 return true; 1335 } 1336 return false; 1337 } 1338 1339 void Arguments::set_ergonomics_flags() { 1340 // Parallel GC is not compatible with sharing. If one specifies 1341 // that they want sharing explicitly, do not set ergonomics flags. 1342 if (DumpSharedSpaces || RequireSharedSpaces) { 1343 return; 1344 } 1345 1346 if (os::is_server_class_machine()) { 1347 // If no other collector is requested explicitly, 1348 // let the VM select the collector based on 1349 // machine class and automatic selection policy. 1350 if (!UseSerialGC && 1351 !UseConcMarkSweepGC && 1352 !UseG1GC && 1353 !UseParNewGC && 1354 !DumpSharedSpaces && 1355 FLAG_IS_DEFAULT(UseParallelGC)) { 1356 if (should_auto_select_low_pause_collector()) { 1357 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1358 } else { 1359 FLAG_SET_ERGO(bool, UseParallelGC, true); 1360 } 1361 no_shared_spaces(); 1362 } 1363 } 1364 1365 #ifndef ZERO 1366 #ifdef _LP64 1367 // Check that UseCompressedOops can be set with the max heap size allocated 1368 // by ergonomics. 1369 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1370 #if !defined(COMPILER1) || defined(TIERED) 1371 // disable UseCompressedOops by default on MacOS X until 7118647 is fixed 1372 #ifndef __APPLE__ 1373 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1374 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1375 } 1376 #endif // !__APPLE__ 1377 #endif 1378 #ifdef _WIN64 1379 if (UseLargePages && UseCompressedOops) { 1380 // Cannot allocate guard pages for implicit checks in indexed addressing 1381 // mode, when large pages are specified on windows. 1382 // This flag could be switched ON if narrow oop base address is set to 0, 1383 // see code in Universe::initialize_heap(). 1384 Universe::set_narrow_oop_use_implicit_null_checks(false); 1385 } 1386 #endif // _WIN64 1387 } else { 1388 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1389 warning("Max heap size too large for Compressed Oops"); 1390 FLAG_SET_DEFAULT(UseCompressedOops, false); 1391 } 1392 } 1393 // Also checks that certain machines are slower with compressed oops 1394 // in vm_version initialization code. 1395 #endif // _LP64 1396 #endif // !ZERO 1397 } 1398 1399 void Arguments::set_parallel_gc_flags() { 1400 assert(UseParallelGC || UseParallelOldGC, "Error"); 1401 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1402 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1403 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1404 } 1405 FLAG_SET_DEFAULT(UseParallelGC, true); 1406 1407 // If no heap maximum was requested explicitly, use some reasonable fraction 1408 // of the physical memory, up to a maximum of 1GB. 1409 if (UseParallelGC) { 1410 FLAG_SET_DEFAULT(ParallelGCThreads, 1411 Abstract_VM_Version::parallel_worker_threads()); 1412 1413 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1414 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1415 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1416 // See CR 6362902 for details. 1417 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1418 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1419 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1420 } 1421 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1422 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1423 } 1424 } 1425 1426 if (UseParallelOldGC) { 1427 // Par compact uses lower default values since they are treated as 1428 // minimums. These are different defaults because of the different 1429 // interpretation and are not ergonomically set. 1430 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1431 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1432 } 1433 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1434 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1435 } 1436 } 1437 } 1438 if (UseNUMA) { 1439 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 1440 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 1441 } 1442 // For those collectors or operating systems (eg, Windows) that do 1443 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 1444 UseNUMAInterleaving = true; 1445 } 1446 } 1447 1448 void Arguments::set_g1_gc_flags() { 1449 assert(UseG1GC, "Error"); 1450 #ifdef COMPILER1 1451 FastTLABRefill = false; 1452 #endif 1453 FLAG_SET_DEFAULT(ParallelGCThreads, 1454 Abstract_VM_Version::parallel_worker_threads()); 1455 if (ParallelGCThreads == 0) { 1456 FLAG_SET_DEFAULT(ParallelGCThreads, 1457 Abstract_VM_Version::parallel_worker_threads()); 1458 } 1459 no_shared_spaces(); 1460 1461 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1462 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1463 } 1464 if (PrintGCDetails && Verbose) { 1465 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1466 MarkStackSize / K, MarkStackSizeMax / K); 1467 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1468 } 1469 1470 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1471 // In G1, we want the default GC overhead goal to be higher than 1472 // say in PS. So we set it here to 10%. Otherwise the heap might 1473 // be expanded more aggressively than we would like it to. In 1474 // fact, even 10% seems to not be high enough in some cases 1475 // (especially small GC stress tests that the main thing they do 1476 // is allocation). We might consider increase it further. 1477 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1478 } 1479 } 1480 1481 void Arguments::set_heap_size() { 1482 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1483 // Deprecated flag 1484 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1485 } 1486 1487 const julong phys_mem = 1488 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1489 : (julong)MaxRAM; 1490 1491 // If the maximum heap size has not been set with -Xmx, 1492 // then set it as fraction of the size of physical memory, 1493 // respecting the maximum and minimum sizes of the heap. 1494 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1495 julong reasonable_max = phys_mem / MaxRAMFraction; 1496 1497 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1498 // Small physical memory, so use a minimum fraction of it for the heap 1499 reasonable_max = phys_mem / MinRAMFraction; 1500 } else { 1501 // Not-small physical memory, so require a heap at least 1502 // as large as MaxHeapSize 1503 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1504 } 1505 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1506 // Limit the heap size to ErgoHeapSizeLimit 1507 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1508 } 1509 if (UseCompressedOops) { 1510 // Limit the heap size to the maximum possible when using compressed oops 1511 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1512 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1513 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1514 // but it should be not less than default MaxHeapSize. 1515 max_coop_heap -= HeapBaseMinAddress; 1516 } 1517 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1518 } 1519 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1520 1521 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1522 // An initial heap size was specified on the command line, 1523 // so be sure that the maximum size is consistent. Done 1524 // after call to allocatable_physical_memory because that 1525 // method might reduce the allocation size. 1526 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1527 } 1528 1529 if (PrintGCDetails && Verbose) { 1530 // Cannot use gclog_or_tty yet. 1531 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1532 } 1533 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1534 } 1535 1536 // If the initial_heap_size has not been set with InitialHeapSize 1537 // or -Xms, then set it as fraction of the size of physical memory, 1538 // respecting the maximum and minimum sizes of the heap. 1539 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1540 julong reasonable_minimum = (julong)(OldSize + NewSize); 1541 1542 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1543 1544 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1545 1546 julong reasonable_initial = phys_mem / InitialRAMFraction; 1547 1548 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1549 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1550 1551 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1552 1553 if (PrintGCDetails && Verbose) { 1554 // Cannot use gclog_or_tty yet. 1555 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1556 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1557 } 1558 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1559 set_min_heap_size((uintx)reasonable_minimum); 1560 } 1561 } 1562 1563 // This must be called after ergonomics because we want bytecode rewriting 1564 // if the server compiler is used, or if UseSharedSpaces is disabled. 1565 void Arguments::set_bytecode_flags() { 1566 // Better not attempt to store into a read-only space. 1567 if (UseSharedSpaces) { 1568 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1569 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1570 } 1571 1572 if (!RewriteBytecodes) { 1573 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1574 } 1575 } 1576 1577 // Aggressive optimization flags -XX:+AggressiveOpts 1578 void Arguments::set_aggressive_opts_flags() { 1579 #ifdef COMPILER2 1580 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1581 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1582 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1583 } 1584 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1585 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1586 } 1587 1588 // Feed the cache size setting into the JDK 1589 char buffer[1024]; 1590 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1591 add_property(buffer); 1592 } 1593 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1594 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1595 } 1596 #endif 1597 1598 if (AggressiveOpts) { 1599 // Sample flag setting code 1600 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1601 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1602 // } 1603 } 1604 } 1605 1606 //=========================================================================================================== 1607 // Parsing of java.compiler property 1608 1609 void Arguments::process_java_compiler_argument(char* arg) { 1610 // For backwards compatibility, Djava.compiler=NONE or "" 1611 // causes us to switch to -Xint mode UNLESS -Xdebug 1612 // is also specified. 1613 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1614 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1615 } 1616 } 1617 1618 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1619 _sun_java_launcher = strdup(launcher); 1620 if (strcmp("gamma", _sun_java_launcher) == 0) { 1621 _created_by_gamma_launcher = true; 1622 } 1623 } 1624 1625 bool Arguments::created_by_java_launcher() { 1626 assert(_sun_java_launcher != NULL, "property must have value"); 1627 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1628 } 1629 1630 bool Arguments::created_by_gamma_launcher() { 1631 return _created_by_gamma_launcher; 1632 } 1633 1634 //=========================================================================================================== 1635 // Parsing of main arguments 1636 1637 bool Arguments::verify_interval(uintx val, uintx min, 1638 uintx max, const char* name) { 1639 // Returns true iff value is in the inclusive interval [min..max] 1640 // false, otherwise. 1641 if (val >= min && val <= max) { 1642 return true; 1643 } 1644 jio_fprintf(defaultStream::error_stream(), 1645 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1646 " and " UINTX_FORMAT "\n", 1647 name, val, min, max); 1648 return false; 1649 } 1650 1651 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1652 // Returns true if given value is at least specified min threshold 1653 // false, otherwise. 1654 if (val >= min ) { 1655 return true; 1656 } 1657 jio_fprintf(defaultStream::error_stream(), 1658 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1659 name, val, min); 1660 return false; 1661 } 1662 1663 bool Arguments::verify_percentage(uintx value, const char* name) { 1664 if (value <= 100) { 1665 return true; 1666 } 1667 jio_fprintf(defaultStream::error_stream(), 1668 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1669 name, value); 1670 return false; 1671 } 1672 1673 static void force_serial_gc() { 1674 FLAG_SET_DEFAULT(UseSerialGC, true); 1675 FLAG_SET_DEFAULT(UseParNewGC, false); 1676 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1677 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1678 FLAG_SET_DEFAULT(UseParallelGC, false); 1679 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1680 FLAG_SET_DEFAULT(UseG1GC, false); 1681 } 1682 1683 static bool verify_serial_gc_flags() { 1684 return (UseSerialGC && 1685 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1686 UseParallelGC || UseParallelOldGC)); 1687 } 1688 1689 // check if do gclog rotation 1690 // +UseGCLogFileRotation is a must, 1691 // no gc log rotation when log file not supplied or 1692 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1693 void check_gclog_consistency() { 1694 if (UseGCLogFileRotation) { 1695 if ((Arguments::gc_log_filename() == NULL) || 1696 (NumberOfGCLogFiles == 0) || 1697 (GCLogFileSize == 0)) { 1698 jio_fprintf(defaultStream::output_stream(), 1699 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1700 "where num_of_file > 0 and num_of_size > 0\n" 1701 "GC log rotation is turned off\n"); 1702 UseGCLogFileRotation = false; 1703 } 1704 } 1705 1706 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1707 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1708 jio_fprintf(defaultStream::output_stream(), 1709 "GCLogFileSize changed to minimum 8K\n"); 1710 } 1711 } 1712 1713 // Check consistency of GC selection 1714 bool Arguments::check_gc_consistency() { 1715 check_gclog_consistency(); 1716 bool status = true; 1717 // Ensure that the user has not selected conflicting sets 1718 // of collectors. [Note: this check is merely a user convenience; 1719 // collectors over-ride each other so that only a non-conflicting 1720 // set is selected; however what the user gets is not what they 1721 // may have expected from the combination they asked for. It's 1722 // better to reduce user confusion by not allowing them to 1723 // select conflicting combinations. 1724 uint i = 0; 1725 if (UseSerialGC) i++; 1726 if (UseConcMarkSweepGC || UseParNewGC) i++; 1727 if (UseParallelGC || UseParallelOldGC) i++; 1728 if (UseG1GC) i++; 1729 if (i > 1) { 1730 jio_fprintf(defaultStream::error_stream(), 1731 "Conflicting collector combinations in option list; " 1732 "please refer to the release notes for the combinations " 1733 "allowed\n"); 1734 status = false; 1735 } 1736 1737 return status; 1738 } 1739 1740 // Check stack pages settings 1741 bool Arguments::check_stack_pages() 1742 { 1743 bool status = true; 1744 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1745 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1746 // greater stack shadow pages can't generate instruction to bang stack 1747 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1748 return status; 1749 } 1750 1751 // Check the consistency of vm_init_args 1752 bool Arguments::check_vm_args_consistency() { 1753 // Method for adding checks for flag consistency. 1754 // The intent is to warn the user of all possible conflicts, 1755 // before returning an error. 1756 // Note: Needs platform-dependent factoring. 1757 bool status = true; 1758 1759 #if ( (defined(COMPILER2) && defined(SPARC))) 1760 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1761 // on sparc doesn't require generation of a stub as is the case on, e.g., 1762 // x86. Normally, VM_Version_init must be called from init_globals in 1763 // init.cpp, which is called by the initial java thread *after* arguments 1764 // have been parsed. VM_Version_init gets called twice on sparc. 1765 extern void VM_Version_init(); 1766 VM_Version_init(); 1767 if (!VM_Version::has_v9()) { 1768 jio_fprintf(defaultStream::error_stream(), 1769 "V8 Machine detected, Server requires V9\n"); 1770 status = false; 1771 } 1772 #endif /* COMPILER2 && SPARC */ 1773 1774 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1775 // builds so the cost of stack banging can be measured. 1776 #if (defined(PRODUCT) && defined(SOLARIS)) 1777 if (!UseBoundThreads && !UseStackBanging) { 1778 jio_fprintf(defaultStream::error_stream(), 1779 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1780 1781 status = false; 1782 } 1783 #endif 1784 1785 if (TLABRefillWasteFraction == 0) { 1786 jio_fprintf(defaultStream::error_stream(), 1787 "TLABRefillWasteFraction should be a denominator, " 1788 "not " SIZE_FORMAT "\n", 1789 TLABRefillWasteFraction); 1790 status = false; 1791 } 1792 1793 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1794 "AdaptiveSizePolicyWeight"); 1795 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1796 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1797 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1798 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1799 1800 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1801 jio_fprintf(defaultStream::error_stream(), 1802 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1803 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1804 MinHeapFreeRatio, MaxHeapFreeRatio); 1805 status = false; 1806 } 1807 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1808 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1809 1810 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1811 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1812 } 1813 1814 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1815 // Settings to encourage splitting. 1816 if (!FLAG_IS_CMDLINE(NewRatio)) { 1817 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1818 } 1819 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1820 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1821 } 1822 } 1823 1824 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1825 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1826 if (GCTimeLimit == 100) { 1827 // Turn off gc-overhead-limit-exceeded checks 1828 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1829 } 1830 1831 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1832 1833 status = status && check_gc_consistency(); 1834 status = status && check_stack_pages(); 1835 1836 if (_has_alloc_profile) { 1837 if (UseParallelGC || UseParallelOldGC) { 1838 jio_fprintf(defaultStream::error_stream(), 1839 "error: invalid argument combination.\n" 1840 "Allocation profiling (-Xaprof) cannot be used together with " 1841 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1842 status = false; 1843 } 1844 if (UseConcMarkSweepGC) { 1845 jio_fprintf(defaultStream::error_stream(), 1846 "error: invalid argument combination.\n" 1847 "Allocation profiling (-Xaprof) cannot be used together with " 1848 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1849 status = false; 1850 } 1851 } 1852 1853 if (CMSIncrementalMode) { 1854 if (!UseConcMarkSweepGC) { 1855 jio_fprintf(defaultStream::error_stream(), 1856 "error: invalid argument combination.\n" 1857 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1858 "selected in order\nto use CMSIncrementalMode.\n"); 1859 status = false; 1860 } else { 1861 status = status && verify_percentage(CMSIncrementalDutyCycle, 1862 "CMSIncrementalDutyCycle"); 1863 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1864 "CMSIncrementalDutyCycleMin"); 1865 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1866 "CMSIncrementalSafetyFactor"); 1867 status = status && verify_percentage(CMSIncrementalOffset, 1868 "CMSIncrementalOffset"); 1869 status = status && verify_percentage(CMSExpAvgFactor, 1870 "CMSExpAvgFactor"); 1871 // If it was not set on the command line, set 1872 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1873 if (CMSInitiatingOccupancyFraction < 0) { 1874 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1875 } 1876 } 1877 } 1878 1879 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1880 // insists that we hold the requisite locks so that the iteration is 1881 // MT-safe. For the verification at start-up and shut-down, we don't 1882 // yet have a good way of acquiring and releasing these locks, 1883 // which are not visible at the CollectedHeap level. We want to 1884 // be able to acquire these locks and then do the iteration rather 1885 // than just disable the lock verification. This will be fixed under 1886 // bug 4788986. 1887 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1888 if (VerifyGCStartAt == 0) { 1889 warning("Heap verification at start-up disabled " 1890 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1891 VerifyGCStartAt = 1; // Disable verification at start-up 1892 } 1893 if (VerifyBeforeExit) { 1894 warning("Heap verification at shutdown disabled " 1895 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1896 VerifyBeforeExit = false; // Disable verification at shutdown 1897 } 1898 } 1899 1900 // Note: only executed in non-PRODUCT mode 1901 if (!UseAsyncConcMarkSweepGC && 1902 (ExplicitGCInvokesConcurrent || 1903 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1904 jio_fprintf(defaultStream::error_stream(), 1905 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1906 " with -UseAsyncConcMarkSweepGC"); 1907 status = false; 1908 } 1909 1910 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 1911 1912 #ifndef SERIALGC 1913 if (UseG1GC) { 1914 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1915 "InitiatingHeapOccupancyPercent"); 1916 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1917 "G1RefProcDrainInterval"); 1918 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1919 "G1ConcMarkStepDurationMillis"); 1920 } 1921 #endif 1922 1923 status = status && verify_interval(RefDiscoveryPolicy, 1924 ReferenceProcessor::DiscoveryPolicyMin, 1925 ReferenceProcessor::DiscoveryPolicyMax, 1926 "RefDiscoveryPolicy"); 1927 1928 // Limit the lower bound of this flag to 1 as it is used in a division 1929 // expression. 1930 status = status && verify_interval(TLABWasteTargetPercent, 1931 1, 100, "TLABWasteTargetPercent"); 1932 1933 status = status && verify_object_alignment(); 1934 1935 return status; 1936 } 1937 1938 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1939 const char* option_type) { 1940 if (ignore) return false; 1941 1942 const char* spacer = " "; 1943 if (option_type == NULL) { 1944 option_type = ++spacer; // Set both to the empty string. 1945 } 1946 1947 if (os::obsolete_option(option)) { 1948 jio_fprintf(defaultStream::error_stream(), 1949 "Obsolete %s%soption: %s\n", option_type, spacer, 1950 option->optionString); 1951 return false; 1952 } else { 1953 jio_fprintf(defaultStream::error_stream(), 1954 "Unrecognized %s%soption: %s\n", option_type, spacer, 1955 option->optionString); 1956 return true; 1957 } 1958 } 1959 1960 static const char* user_assertion_options[] = { 1961 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1962 }; 1963 1964 static const char* system_assertion_options[] = { 1965 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1966 }; 1967 1968 // Return true if any of the strings in null-terminated array 'names' matches. 1969 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 1970 // the option must match exactly. 1971 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 1972 bool tail_allowed) { 1973 for (/* empty */; *names != NULL; ++names) { 1974 if (match_option(option, *names, tail)) { 1975 if (**tail == '\0' || tail_allowed && **tail == ':') { 1976 return true; 1977 } 1978 } 1979 } 1980 return false; 1981 } 1982 1983 bool Arguments::parse_uintx(const char* value, 1984 uintx* uintx_arg, 1985 uintx min_size) { 1986 1987 // Check the sign first since atomull() parses only unsigned values. 1988 bool value_is_positive = !(*value == '-'); 1989 1990 if (value_is_positive) { 1991 julong n; 1992 bool good_return = atomull(value, &n); 1993 if (good_return) { 1994 bool above_minimum = n >= min_size; 1995 bool value_is_too_large = n > max_uintx; 1996 1997 if (above_minimum && !value_is_too_large) { 1998 *uintx_arg = n; 1999 return true; 2000 } 2001 } 2002 } 2003 return false; 2004 } 2005 2006 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2007 julong* long_arg, 2008 julong min_size) { 2009 if (!atomull(s, long_arg)) return arg_unreadable; 2010 return check_memory_size(*long_arg, min_size); 2011 } 2012 2013 // Parse JavaVMInitArgs structure 2014 2015 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2016 // For components of the system classpath. 2017 SysClassPath scp(Arguments::get_sysclasspath()); 2018 bool scp_assembly_required = false; 2019 2020 // Save default settings for some mode flags 2021 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2022 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2023 Arguments::_ClipInlining = ClipInlining; 2024 Arguments::_BackgroundCompilation = BackgroundCompilation; 2025 2026 // Setup flags for mixed which is the default 2027 set_mode_flags(_mixed); 2028 2029 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2030 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2031 if (result != JNI_OK) { 2032 return result; 2033 } 2034 2035 // Parse JavaVMInitArgs structure passed in 2036 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2037 if (result != JNI_OK) { 2038 return result; 2039 } 2040 2041 if (AggressiveOpts) { 2042 // Insert alt-rt.jar between user-specified bootclasspath 2043 // prefix and the default bootclasspath. os::set_boot_path() 2044 // uses meta_index_dir as the default bootclasspath directory. 2045 const char* altclasses_jar = "alt-rt.jar"; 2046 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2047 strlen(altclasses_jar); 2048 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 2049 strcpy(altclasses_path, get_meta_index_dir()); 2050 strcat(altclasses_path, altclasses_jar); 2051 scp.add_suffix_to_prefix(altclasses_path); 2052 scp_assembly_required = true; 2053 FREE_C_HEAP_ARRAY(char, altclasses_path); 2054 } 2055 2056 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2057 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2058 if (result != JNI_OK) { 2059 return result; 2060 } 2061 2062 // Do final processing now that all arguments have been parsed 2063 result = finalize_vm_init_args(&scp, scp_assembly_required); 2064 if (result != JNI_OK) { 2065 return result; 2066 } 2067 2068 return JNI_OK; 2069 } 2070 2071 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2072 SysClassPath* scp_p, 2073 bool* scp_assembly_required_p, 2074 FlagValueOrigin origin) { 2075 // Remaining part of option string 2076 const char* tail; 2077 2078 // iterate over arguments 2079 for (int index = 0; index < args->nOptions; index++) { 2080 bool is_absolute_path = false; // for -agentpath vs -agentlib 2081 2082 const JavaVMOption* option = args->options + index; 2083 2084 if (!match_option(option, "-Djava.class.path", &tail) && 2085 !match_option(option, "-Dsun.java.command", &tail) && 2086 !match_option(option, "-Dsun.java.launcher", &tail)) { 2087 2088 // add all jvm options to the jvm_args string. This string 2089 // is used later to set the java.vm.args PerfData string constant. 2090 // the -Djava.class.path and the -Dsun.java.command options are 2091 // omitted from jvm_args string as each have their own PerfData 2092 // string constant object. 2093 build_jvm_args(option->optionString); 2094 } 2095 2096 // -verbose:[class/gc/jni] 2097 if (match_option(option, "-verbose", &tail)) { 2098 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2099 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2100 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2101 } else if (!strcmp(tail, ":gc")) { 2102 FLAG_SET_CMDLINE(bool, PrintGC, true); 2103 } else if (!strcmp(tail, ":jni")) { 2104 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2105 } 2106 // -da / -ea / -disableassertions / -enableassertions 2107 // These accept an optional class/package name separated by a colon, e.g., 2108 // -da:java.lang.Thread. 2109 } else if (match_option(option, user_assertion_options, &tail, true)) { 2110 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2111 if (*tail == '\0') { 2112 JavaAssertions::setUserClassDefault(enable); 2113 } else { 2114 assert(*tail == ':', "bogus match by match_option()"); 2115 JavaAssertions::addOption(tail + 1, enable); 2116 } 2117 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2118 } else if (match_option(option, system_assertion_options, &tail, false)) { 2119 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2120 JavaAssertions::setSystemClassDefault(enable); 2121 // -bootclasspath: 2122 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2123 scp_p->reset_path(tail); 2124 *scp_assembly_required_p = true; 2125 // -bootclasspath/a: 2126 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2127 scp_p->add_suffix(tail); 2128 *scp_assembly_required_p = true; 2129 // -bootclasspath/p: 2130 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2131 scp_p->add_prefix(tail); 2132 *scp_assembly_required_p = true; 2133 // -Xrun 2134 } else if (match_option(option, "-Xrun", &tail)) { 2135 if (tail != NULL) { 2136 const char* pos = strchr(tail, ':'); 2137 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2138 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2139 name[len] = '\0'; 2140 2141 char *options = NULL; 2142 if(pos != NULL) { 2143 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2144 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 2145 } 2146 #ifdef JVMTI_KERNEL 2147 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2148 warning("profiling and debugging agents are not supported with Kernel VM"); 2149 } else 2150 #endif // JVMTI_KERNEL 2151 add_init_library(name, options); 2152 } 2153 // -agentlib and -agentpath 2154 } else if (match_option(option, "-agentlib:", &tail) || 2155 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2156 if(tail != NULL) { 2157 const char* pos = strchr(tail, '='); 2158 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2159 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2160 name[len] = '\0'; 2161 2162 char *options = NULL; 2163 if(pos != NULL) { 2164 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 2165 } 2166 #ifdef JVMTI_KERNEL 2167 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2168 warning("profiling and debugging agents are not supported with Kernel VM"); 2169 } else 2170 #endif // JVMTI_KERNEL 2171 add_init_agent(name, options, is_absolute_path); 2172 2173 } 2174 // -javaagent 2175 } else if (match_option(option, "-javaagent:", &tail)) { 2176 if(tail != NULL) { 2177 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 2178 add_init_agent("instrument", options, false); 2179 } 2180 // -Xnoclassgc 2181 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2182 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2183 // -Xincgc: i-CMS 2184 } else if (match_option(option, "-Xincgc", &tail)) { 2185 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2186 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2187 // -Xnoincgc: no i-CMS 2188 } else if (match_option(option, "-Xnoincgc", &tail)) { 2189 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2190 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2191 // -Xconcgc 2192 } else if (match_option(option, "-Xconcgc", &tail)) { 2193 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2194 // -Xnoconcgc 2195 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2196 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2197 // -Xbatch 2198 } else if (match_option(option, "-Xbatch", &tail)) { 2199 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2200 // -Xmn for compatibility with other JVM vendors 2201 } else if (match_option(option, "-Xmn", &tail)) { 2202 julong long_initial_eden_size = 0; 2203 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2204 if (errcode != arg_in_range) { 2205 jio_fprintf(defaultStream::error_stream(), 2206 "Invalid initial eden size: %s\n", option->optionString); 2207 describe_range_error(errcode); 2208 return JNI_EINVAL; 2209 } 2210 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2211 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2212 // -Xms 2213 } else if (match_option(option, "-Xms", &tail)) { 2214 julong long_initial_heap_size = 0; 2215 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2216 if (errcode != arg_in_range) { 2217 jio_fprintf(defaultStream::error_stream(), 2218 "Invalid initial heap size: %s\n", option->optionString); 2219 describe_range_error(errcode); 2220 return JNI_EINVAL; 2221 } 2222 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2223 // Currently the minimum size and the initial heap sizes are the same. 2224 set_min_heap_size(InitialHeapSize); 2225 // -Xmx 2226 } else if (match_option(option, "-Xmx", &tail)) { 2227 julong long_max_heap_size = 0; 2228 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2229 if (errcode != arg_in_range) { 2230 jio_fprintf(defaultStream::error_stream(), 2231 "Invalid maximum heap size: %s\n", option->optionString); 2232 describe_range_error(errcode); 2233 return JNI_EINVAL; 2234 } 2235 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2236 // Xmaxf 2237 } else if (match_option(option, "-Xmaxf", &tail)) { 2238 int maxf = (int)(atof(tail) * 100); 2239 if (maxf < 0 || maxf > 100) { 2240 jio_fprintf(defaultStream::error_stream(), 2241 "Bad max heap free percentage size: %s\n", 2242 option->optionString); 2243 return JNI_EINVAL; 2244 } else { 2245 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2246 } 2247 // Xminf 2248 } else if (match_option(option, "-Xminf", &tail)) { 2249 int minf = (int)(atof(tail) * 100); 2250 if (minf < 0 || minf > 100) { 2251 jio_fprintf(defaultStream::error_stream(), 2252 "Bad min heap free percentage size: %s\n", 2253 option->optionString); 2254 return JNI_EINVAL; 2255 } else { 2256 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2257 } 2258 // -Xss 2259 } else if (match_option(option, "-Xss", &tail)) { 2260 julong long_ThreadStackSize = 0; 2261 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2262 if (errcode != arg_in_range) { 2263 jio_fprintf(defaultStream::error_stream(), 2264 "Invalid thread stack size: %s\n", option->optionString); 2265 describe_range_error(errcode); 2266 return JNI_EINVAL; 2267 } 2268 // Internally track ThreadStackSize in units of 1024 bytes. 2269 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2270 round_to((int)long_ThreadStackSize, K) / K); 2271 // -Xoss 2272 } else if (match_option(option, "-Xoss", &tail)) { 2273 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2274 // -Xmaxjitcodesize 2275 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2276 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2277 julong long_ReservedCodeCacheSize = 0; 2278 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2279 (size_t)InitialCodeCacheSize); 2280 if (errcode != arg_in_range) { 2281 jio_fprintf(defaultStream::error_stream(), 2282 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2283 option->optionString, InitialCodeCacheSize/K); 2284 describe_range_error(errcode); 2285 return JNI_EINVAL; 2286 } 2287 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2288 // -green 2289 } else if (match_option(option, "-green", &tail)) { 2290 jio_fprintf(defaultStream::error_stream(), 2291 "Green threads support not available\n"); 2292 return JNI_EINVAL; 2293 // -native 2294 } else if (match_option(option, "-native", &tail)) { 2295 // HotSpot always uses native threads, ignore silently for compatibility 2296 // -Xsqnopause 2297 } else if (match_option(option, "-Xsqnopause", &tail)) { 2298 // EVM option, ignore silently for compatibility 2299 // -Xrs 2300 } else if (match_option(option, "-Xrs", &tail)) { 2301 // Classic/EVM option, new functionality 2302 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2303 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2304 // change default internal VM signals used - lower case for back compat 2305 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2306 // -Xoptimize 2307 } else if (match_option(option, "-Xoptimize", &tail)) { 2308 // EVM option, ignore silently for compatibility 2309 // -Xprof 2310 } else if (match_option(option, "-Xprof", &tail)) { 2311 #ifndef FPROF_KERNEL 2312 _has_profile = true; 2313 #else // FPROF_KERNEL 2314 // do we have to exit? 2315 warning("Kernel VM does not support flat profiling."); 2316 #endif // FPROF_KERNEL 2317 // -Xaprof 2318 } else if (match_option(option, "-Xaprof", &tail)) { 2319 _has_alloc_profile = true; 2320 // -Xconcurrentio 2321 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2322 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2323 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2324 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2325 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2326 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2327 2328 // -Xinternalversion 2329 } else if (match_option(option, "-Xinternalversion", &tail)) { 2330 jio_fprintf(defaultStream::output_stream(), "%s\n", 2331 VM_Version::internal_vm_info_string()); 2332 vm_exit(0); 2333 #ifndef PRODUCT 2334 // -Xprintflags 2335 } else if (match_option(option, "-Xprintflags", &tail)) { 2336 CommandLineFlags::printFlags(tty, false); 2337 vm_exit(0); 2338 #endif 2339 // -D 2340 } else if (match_option(option, "-D", &tail)) { 2341 if (!add_property(tail)) { 2342 return JNI_ENOMEM; 2343 } 2344 // Out of the box management support 2345 if (match_option(option, "-Dcom.sun.management", &tail)) { 2346 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2347 } 2348 // -Xint 2349 } else if (match_option(option, "-Xint", &tail)) { 2350 set_mode_flags(_int); 2351 // -Xmixed 2352 } else if (match_option(option, "-Xmixed", &tail)) { 2353 set_mode_flags(_mixed); 2354 // -Xcomp 2355 } else if (match_option(option, "-Xcomp", &tail)) { 2356 // for testing the compiler; turn off all flags that inhibit compilation 2357 set_mode_flags(_comp); 2358 2359 // -Xshare:dump 2360 } else if (match_option(option, "-Xshare:dump", &tail)) { 2361 #ifdef TIERED 2362 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2363 set_mode_flags(_int); // Prevent compilation, which creates objects 2364 #elif defined(COMPILER2) 2365 vm_exit_during_initialization( 2366 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2367 #elif defined(KERNEL) 2368 vm_exit_during_initialization( 2369 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2370 #else 2371 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2372 set_mode_flags(_int); // Prevent compilation, which creates objects 2373 #endif 2374 // -Xshare:on 2375 } else if (match_option(option, "-Xshare:on", &tail)) { 2376 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2377 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2378 // -Xshare:auto 2379 } else if (match_option(option, "-Xshare:auto", &tail)) { 2380 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2381 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2382 // -Xshare:off 2383 } else if (match_option(option, "-Xshare:off", &tail)) { 2384 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2385 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2386 2387 // -Xverify 2388 } else if (match_option(option, "-Xverify", &tail)) { 2389 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2390 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2391 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2392 } else if (strcmp(tail, ":remote") == 0) { 2393 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2394 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2395 } else if (strcmp(tail, ":none") == 0) { 2396 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2397 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2398 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2399 return JNI_EINVAL; 2400 } 2401 // -Xdebug 2402 } else if (match_option(option, "-Xdebug", &tail)) { 2403 // note this flag has been used, then ignore 2404 set_xdebug_mode(true); 2405 // -Xnoagent 2406 } else if (match_option(option, "-Xnoagent", &tail)) { 2407 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2408 } else if (match_option(option, "-Xboundthreads", &tail)) { 2409 // Bind user level threads to kernel threads (Solaris only) 2410 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2411 } else if (match_option(option, "-Xloggc:", &tail)) { 2412 // Redirect GC output to the file. -Xloggc:<filename> 2413 // ostream_init_log(), when called will use this filename 2414 // to initialize a fileStream. 2415 _gc_log_filename = strdup(tail); 2416 FLAG_SET_CMDLINE(bool, PrintGC, true); 2417 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2418 2419 // JNI hooks 2420 } else if (match_option(option, "-Xcheck", &tail)) { 2421 if (!strcmp(tail, ":jni")) { 2422 CheckJNICalls = true; 2423 } else if (is_bad_option(option, args->ignoreUnrecognized, 2424 "check")) { 2425 return JNI_EINVAL; 2426 } 2427 } else if (match_option(option, "vfprintf", &tail)) { 2428 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2429 } else if (match_option(option, "exit", &tail)) { 2430 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2431 } else if (match_option(option, "abort", &tail)) { 2432 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2433 // -XX:+AggressiveHeap 2434 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2435 2436 // This option inspects the machine and attempts to set various 2437 // parameters to be optimal for long-running, memory allocation 2438 // intensive jobs. It is intended for machines with large 2439 // amounts of cpu and memory. 2440 2441 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2442 // VM, but we may not be able to represent the total physical memory 2443 // available (like having 8gb of memory on a box but using a 32bit VM). 2444 // Thus, we need to make sure we're using a julong for intermediate 2445 // calculations. 2446 julong initHeapSize; 2447 julong total_memory = os::physical_memory(); 2448 2449 if (total_memory < (julong)256*M) { 2450 jio_fprintf(defaultStream::error_stream(), 2451 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2452 vm_exit(1); 2453 } 2454 2455 // The heap size is half of available memory, or (at most) 2456 // all of possible memory less 160mb (leaving room for the OS 2457 // when using ISM). This is the maximum; because adaptive sizing 2458 // is turned on below, the actual space used may be smaller. 2459 2460 initHeapSize = MIN2(total_memory / (julong)2, 2461 total_memory - (julong)160*M); 2462 2463 // Make sure that if we have a lot of memory we cap the 32 bit 2464 // process space. The 64bit VM version of this function is a nop. 2465 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2466 2467 // The perm gen is separate but contiguous with the 2468 // object heap (and is reserved with it) so subtract it 2469 // from the heap size. 2470 if (initHeapSize > MaxPermSize) { 2471 initHeapSize = initHeapSize - MaxPermSize; 2472 } else { 2473 warning("AggressiveHeap and MaxPermSize values may conflict"); 2474 } 2475 2476 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2477 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2478 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2479 // Currently the minimum size and the initial heap sizes are the same. 2480 set_min_heap_size(initHeapSize); 2481 } 2482 if (FLAG_IS_DEFAULT(NewSize)) { 2483 // Make the young generation 3/8ths of the total heap. 2484 FLAG_SET_CMDLINE(uintx, NewSize, 2485 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2486 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2487 } 2488 2489 FLAG_SET_DEFAULT(UseLargePages, true); 2490 2491 // Increase some data structure sizes for efficiency 2492 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2493 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2494 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2495 2496 // See the OldPLABSize comment below, but replace 'after promotion' 2497 // with 'after copying'. YoungPLABSize is the size of the survivor 2498 // space per-gc-thread buffers. The default is 4kw. 2499 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2500 2501 // OldPLABSize is the size of the buffers in the old gen that 2502 // UseParallelGC uses to promote live data that doesn't fit in the 2503 // survivor spaces. At any given time, there's one for each gc thread. 2504 // The default size is 1kw. These buffers are rarely used, since the 2505 // survivor spaces are usually big enough. For specjbb, however, there 2506 // are occasions when there's lots of live data in the young gen 2507 // and we end up promoting some of it. We don't have a definite 2508 // explanation for why bumping OldPLABSize helps, but the theory 2509 // is that a bigger PLAB results in retaining something like the 2510 // original allocation order after promotion, which improves mutator 2511 // locality. A minor effect may be that larger PLABs reduce the 2512 // number of PLAB allocation events during gc. The value of 8kw 2513 // was arrived at by experimenting with specjbb. 2514 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2515 2516 // CompilationPolicyChoice=0 causes the server compiler to adopt 2517 // a more conservative which-method-do-I-compile policy when one 2518 // of the counters maintained by the interpreter trips. The 2519 // result is reduced startup time and improved specjbb and 2520 // alacrity performance. Zero is the default, but we set it 2521 // explicitly here in case the default changes. 2522 // See runtime/compilationPolicy.*. 2523 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2524 2525 // Enable parallel GC and adaptive generation sizing 2526 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2527 FLAG_SET_DEFAULT(ParallelGCThreads, 2528 Abstract_VM_Version::parallel_worker_threads()); 2529 2530 // Encourage steady state memory management 2531 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2532 2533 // This appears to improve mutator locality 2534 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2535 2536 // Get around early Solaris scheduling bug 2537 // (affinity vs other jobs on system) 2538 // but disallow DR and offlining (5008695). 2539 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2540 2541 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2542 // The last option must always win. 2543 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2544 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2545 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2546 // The last option must always win. 2547 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2548 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2549 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2550 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2551 jio_fprintf(defaultStream::error_stream(), 2552 "Please use CMSClassUnloadingEnabled in place of " 2553 "CMSPermGenSweepingEnabled in the future\n"); 2554 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2555 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2556 jio_fprintf(defaultStream::error_stream(), 2557 "Please use -XX:+UseGCOverheadLimit in place of " 2558 "-XX:+UseGCTimeLimit in the future\n"); 2559 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2560 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2561 jio_fprintf(defaultStream::error_stream(), 2562 "Please use -XX:-UseGCOverheadLimit in place of " 2563 "-XX:-UseGCTimeLimit in the future\n"); 2564 // The TLE options are for compatibility with 1.3 and will be 2565 // removed without notice in a future release. These options 2566 // are not to be documented. 2567 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2568 // No longer used. 2569 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2570 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2571 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2572 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2573 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2574 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2575 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2576 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2577 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2578 // No longer used. 2579 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2580 julong long_tlab_size = 0; 2581 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2582 if (errcode != arg_in_range) { 2583 jio_fprintf(defaultStream::error_stream(), 2584 "Invalid TLAB size: %s\n", option->optionString); 2585 describe_range_error(errcode); 2586 return JNI_EINVAL; 2587 } 2588 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2589 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2590 // No longer used. 2591 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2592 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2593 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2594 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2595 SOLARIS_ONLY( 2596 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2597 warning("-XX:+UsePermISM is obsolete."); 2598 FLAG_SET_CMDLINE(bool, UseISM, true); 2599 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2600 FLAG_SET_CMDLINE(bool, UseISM, false); 2601 ) 2602 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2603 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2604 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2605 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2606 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2607 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2608 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2609 #if defined(DTRACE_ENABLED) 2610 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2611 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2612 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2613 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2614 #else // defined(DTRACE_ENABLED) 2615 jio_fprintf(defaultStream::error_stream(), 2616 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2617 return JNI_EINVAL; 2618 #endif // defined(DTRACE_ENABLED) 2619 #ifdef ASSERT 2620 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2621 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2622 // disable scavenge before parallel mark-compact 2623 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2624 #endif 2625 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2626 julong cms_blocks_to_claim = (julong)atol(tail); 2627 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2628 jio_fprintf(defaultStream::error_stream(), 2629 "Please use -XX:OldPLABSize in place of " 2630 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2631 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2632 julong cms_blocks_to_claim = (julong)atol(tail); 2633 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2634 jio_fprintf(defaultStream::error_stream(), 2635 "Please use -XX:OldPLABSize in place of " 2636 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2637 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2638 julong old_plab_size = 0; 2639 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2640 if (errcode != arg_in_range) { 2641 jio_fprintf(defaultStream::error_stream(), 2642 "Invalid old PLAB size: %s\n", option->optionString); 2643 describe_range_error(errcode); 2644 return JNI_EINVAL; 2645 } 2646 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2647 jio_fprintf(defaultStream::error_stream(), 2648 "Please use -XX:OldPLABSize in place of " 2649 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2650 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2651 julong young_plab_size = 0; 2652 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2653 if (errcode != arg_in_range) { 2654 jio_fprintf(defaultStream::error_stream(), 2655 "Invalid young PLAB size: %s\n", option->optionString); 2656 describe_range_error(errcode); 2657 return JNI_EINVAL; 2658 } 2659 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2660 jio_fprintf(defaultStream::error_stream(), 2661 "Please use -XX:YoungPLABSize in place of " 2662 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2663 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2664 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2665 julong stack_size = 0; 2666 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2667 if (errcode != arg_in_range) { 2668 jio_fprintf(defaultStream::error_stream(), 2669 "Invalid mark stack size: %s\n", option->optionString); 2670 describe_range_error(errcode); 2671 return JNI_EINVAL; 2672 } 2673 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2674 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2675 julong max_stack_size = 0; 2676 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2677 if (errcode != arg_in_range) { 2678 jio_fprintf(defaultStream::error_stream(), 2679 "Invalid maximum mark stack size: %s\n", 2680 option->optionString); 2681 describe_range_error(errcode); 2682 return JNI_EINVAL; 2683 } 2684 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2685 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2686 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2687 uintx conc_threads = 0; 2688 if (!parse_uintx(tail, &conc_threads, 1)) { 2689 jio_fprintf(defaultStream::error_stream(), 2690 "Invalid concurrent threads: %s\n", option->optionString); 2691 return JNI_EINVAL; 2692 } 2693 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2694 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2695 // Skip -XX:Flags= since that case has already been handled 2696 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2697 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2698 return JNI_EINVAL; 2699 } 2700 } 2701 // Unknown option 2702 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2703 return JNI_ERR; 2704 } 2705 } 2706 2707 // Change the default value for flags which have different default values 2708 // when working with older JDKs. 2709 if (JDK_Version::current().compare_major(6) <= 0 && 2710 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2711 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2712 } 2713 #ifdef LINUX 2714 if (JDK_Version::current().compare_major(6) <= 0 && 2715 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2716 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2717 } 2718 #endif // LINUX 2719 return JNI_OK; 2720 } 2721 2722 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2723 // This must be done after all -D arguments have been processed. 2724 scp_p->expand_endorsed(); 2725 2726 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2727 // Assemble the bootclasspath elements into the final path. 2728 Arguments::set_sysclasspath(scp_p->combined_path()); 2729 } 2730 2731 // This must be done after all arguments have been processed. 2732 // java_compiler() true means set to "NONE" or empty. 2733 if (java_compiler() && !xdebug_mode()) { 2734 // For backwards compatibility, we switch to interpreted mode if 2735 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2736 // not specified. 2737 set_mode_flags(_int); 2738 } 2739 if (CompileThreshold == 0) { 2740 set_mode_flags(_int); 2741 } 2742 2743 #ifndef COMPILER2 2744 // Don't degrade server performance for footprint 2745 if (FLAG_IS_DEFAULT(UseLargePages) && 2746 MaxHeapSize < LargePageHeapSizeThreshold) { 2747 // No need for large granularity pages w/small heaps. 2748 // Note that large pages are enabled/disabled for both the 2749 // Java heap and the code cache. 2750 FLAG_SET_DEFAULT(UseLargePages, false); 2751 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2752 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2753 } 2754 2755 // Tiered compilation is undefined with C1. 2756 TieredCompilation = false; 2757 #else 2758 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2759 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2760 } 2761 #endif 2762 2763 // If we are running in a headless jre, force java.awt.headless property 2764 // to be true unless the property has already been set. 2765 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2766 if (os::is_headless_jre()) { 2767 const char* headless = Arguments::get_property("java.awt.headless"); 2768 if (headless == NULL) { 2769 char envbuffer[128]; 2770 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2771 if (!add_property("java.awt.headless=true")) { 2772 return JNI_ENOMEM; 2773 } 2774 } else { 2775 char buffer[256]; 2776 strcpy(buffer, "java.awt.headless="); 2777 strcat(buffer, envbuffer); 2778 if (!add_property(buffer)) { 2779 return JNI_ENOMEM; 2780 } 2781 } 2782 } 2783 } 2784 2785 if (!check_vm_args_consistency()) { 2786 return JNI_ERR; 2787 } 2788 2789 return JNI_OK; 2790 } 2791 2792 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2793 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2794 scp_assembly_required_p); 2795 } 2796 2797 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2798 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2799 scp_assembly_required_p); 2800 } 2801 2802 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2803 const int N_MAX_OPTIONS = 64; 2804 const int OPTION_BUFFER_SIZE = 1024; 2805 char buffer[OPTION_BUFFER_SIZE]; 2806 2807 // The variable will be ignored if it exceeds the length of the buffer. 2808 // Don't check this variable if user has special privileges 2809 // (e.g. unix su command). 2810 if (os::getenv(name, buffer, sizeof(buffer)) && 2811 !os::have_special_privileges()) { 2812 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2813 jio_fprintf(defaultStream::error_stream(), 2814 "Picked up %s: %s\n", name, buffer); 2815 char* rd = buffer; // pointer to the input string (rd) 2816 int i; 2817 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2818 while (isspace(*rd)) rd++; // skip whitespace 2819 if (*rd == 0) break; // we re done when the input string is read completely 2820 2821 // The output, option string, overwrites the input string. 2822 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2823 // input string (rd). 2824 char* wrt = rd; 2825 2826 options[i++].optionString = wrt; // Fill in option 2827 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2828 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2829 int quote = *rd; // matching quote to look for 2830 rd++; // don't copy open quote 2831 while (*rd != quote) { // include everything (even spaces) up until quote 2832 if (*rd == 0) { // string termination means unmatched string 2833 jio_fprintf(defaultStream::error_stream(), 2834 "Unmatched quote in %s\n", name); 2835 return JNI_ERR; 2836 } 2837 *wrt++ = *rd++; // copy to option string 2838 } 2839 rd++; // don't copy close quote 2840 } else { 2841 *wrt++ = *rd++; // copy to option string 2842 } 2843 } 2844 // Need to check if we're done before writing a NULL, 2845 // because the write could be to the byte that rd is pointing to. 2846 if (*rd++ == 0) { 2847 *wrt = 0; 2848 break; 2849 } 2850 *wrt = 0; // Zero terminate option 2851 } 2852 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2853 JavaVMInitArgs vm_args; 2854 vm_args.version = JNI_VERSION_1_2; 2855 vm_args.options = options; 2856 vm_args.nOptions = i; 2857 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2858 2859 if (PrintVMOptions) { 2860 const char* tail; 2861 for (int i = 0; i < vm_args.nOptions; i++) { 2862 const JavaVMOption *option = vm_args.options + i; 2863 if (match_option(option, "-XX:", &tail)) { 2864 logOption(tail); 2865 } 2866 } 2867 } 2868 2869 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2870 } 2871 return JNI_OK; 2872 } 2873 2874 void Arguments::set_shared_spaces_flags() { 2875 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 2876 const bool might_share = must_share || UseSharedSpaces; 2877 2878 // The string table is part of the shared archive so the size must match. 2879 if (!FLAG_IS_DEFAULT(StringTableSize)) { 2880 // Disable sharing. 2881 if (must_share) { 2882 warning("disabling shared archive %s because of non-default " 2883 "StringTableSize", DumpSharedSpaces ? "creation" : "use"); 2884 } 2885 if (might_share) { 2886 FLAG_SET_DEFAULT(DumpSharedSpaces, false); 2887 FLAG_SET_DEFAULT(RequireSharedSpaces, false); 2888 FLAG_SET_DEFAULT(UseSharedSpaces, false); 2889 } 2890 return; 2891 } 2892 2893 // Check whether class data sharing settings conflict with GC, compressed oops 2894 // or page size, and fix them up. Explicit sharing options override other 2895 // settings. 2896 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode || 2897 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC || 2898 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages); 2899 if (cannot_share) { 2900 if (must_share) { 2901 warning("selecting serial gc and disabling large pages %s" 2902 "because of %s", "" LP64_ONLY("and compressed oops "), 2903 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 2904 force_serial_gc(); 2905 FLAG_SET_CMDLINE(bool, UseLargePages, false); 2906 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 2907 } else { 2908 if (UseSharedSpaces && Verbose) { 2909 warning("turning off use of shared archive because of " 2910 "choice of garbage collector or large pages"); 2911 } 2912 no_shared_spaces(); 2913 } 2914 } else if (UseLargePages && might_share) { 2915 // Disable large pages to allow shared spaces. This is sub-optimal, since 2916 // there may not even be a shared archive to use. 2917 FLAG_SET_DEFAULT(UseLargePages, false); 2918 } 2919 } 2920 2921 // Disable options not supported in this release, with a warning if they 2922 // were explicitly requested on the command-line 2923 #define UNSUPPORTED_OPTION(opt, description) \ 2924 do { \ 2925 if (opt) { \ 2926 if (FLAG_IS_CMDLINE(opt)) { \ 2927 warning(description " is disabled in this release."); \ 2928 } \ 2929 FLAG_SET_DEFAULT(opt, false); \ 2930 } \ 2931 } while(0) 2932 2933 // Parse entry point called from JNI_CreateJavaVM 2934 2935 jint Arguments::parse(const JavaVMInitArgs* args) { 2936 2937 // Sharing support 2938 // Construct the path to the archive 2939 char jvm_path[JVM_MAXPATHLEN]; 2940 os::jvm_path(jvm_path, sizeof(jvm_path)); 2941 char *end = strrchr(jvm_path, *os::file_separator()); 2942 if (end != NULL) *end = '\0'; 2943 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2944 strlen(os::file_separator()) + 20); 2945 if (shared_archive_path == NULL) return JNI_ENOMEM; 2946 strcpy(shared_archive_path, jvm_path); 2947 strcat(shared_archive_path, os::file_separator()); 2948 strcat(shared_archive_path, "classes"); 2949 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2950 strcat(shared_archive_path, ".jsa"); 2951 SharedArchivePath = shared_archive_path; 2952 2953 // Remaining part of option string 2954 const char* tail; 2955 2956 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2957 bool settings_file_specified = false; 2958 const char* flags_file; 2959 int index; 2960 for (index = 0; index < args->nOptions; index++) { 2961 const JavaVMOption *option = args->options + index; 2962 if (match_option(option, "-XX:Flags=", &tail)) { 2963 flags_file = tail; 2964 settings_file_specified = true; 2965 } 2966 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2967 PrintVMOptions = true; 2968 } 2969 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2970 PrintVMOptions = false; 2971 } 2972 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2973 IgnoreUnrecognizedVMOptions = true; 2974 } 2975 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2976 IgnoreUnrecognizedVMOptions = false; 2977 } 2978 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 2979 CommandLineFlags::printFlags(tty, false); 2980 vm_exit(0); 2981 } 2982 2983 #ifndef PRODUCT 2984 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 2985 CommandLineFlags::printFlags(tty, true); 2986 vm_exit(0); 2987 } 2988 #endif 2989 } 2990 2991 if (IgnoreUnrecognizedVMOptions) { 2992 // uncast const to modify the flag args->ignoreUnrecognized 2993 *(jboolean*)(&args->ignoreUnrecognized) = true; 2994 } 2995 2996 // Parse specified settings file 2997 if (settings_file_specified) { 2998 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 2999 return JNI_EINVAL; 3000 } 3001 } 3002 3003 // Parse default .hotspotrc settings file 3004 if (!settings_file_specified) { 3005 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3006 return JNI_EINVAL; 3007 } 3008 } 3009 3010 if (PrintVMOptions) { 3011 for (index = 0; index < args->nOptions; index++) { 3012 const JavaVMOption *option = args->options + index; 3013 if (match_option(option, "-XX:", &tail)) { 3014 logOption(tail); 3015 } 3016 } 3017 } 3018 3019 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3020 jint result = parse_vm_init_args(args); 3021 if (result != JNI_OK) { 3022 return result; 3023 } 3024 3025 #ifdef JAVASE_EMBEDDED 3026 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3027 #endif 3028 3029 #ifndef PRODUCT 3030 if (TraceBytecodesAt != 0) { 3031 TraceBytecodes = true; 3032 } 3033 if (CountCompiledCalls) { 3034 if (UseCounterDecay) { 3035 warning("UseCounterDecay disabled because CountCalls is set"); 3036 UseCounterDecay = false; 3037 } 3038 } 3039 #endif // PRODUCT 3040 3041 // Transitional 3042 if (EnableMethodHandles || AnonymousClasses) { 3043 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3044 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled."); 3045 } else { 3046 EnableInvokeDynamic = true; 3047 } 3048 } 3049 3050 // JSR 292 is not supported before 1.7 3051 if (!JDK_Version::is_gte_jdk17x_version()) { 3052 if (EnableInvokeDynamic) { 3053 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3054 warning("JSR 292 is not supported before 1.7. Disabling support."); 3055 } 3056 EnableInvokeDynamic = false; 3057 } 3058 } 3059 3060 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3061 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3062 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3063 } 3064 ScavengeRootsInCode = 1; 3065 } 3066 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) { 3067 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3068 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false"); 3069 } 3070 ScavengeRootsInCode = 1; 3071 } 3072 3073 if (PrintGCDetails) { 3074 // Turn on -verbose:gc options as well 3075 PrintGC = true; 3076 } 3077 3078 // Set object alignment values. 3079 set_object_alignment(); 3080 3081 #ifdef SERIALGC 3082 force_serial_gc(); 3083 #endif // SERIALGC 3084 #ifdef KERNEL 3085 no_shared_spaces(); 3086 #endif // KERNEL 3087 3088 // Set flags based on ergonomics. 3089 set_ergonomics_flags(); 3090 3091 set_shared_spaces_flags(); 3092 3093 // Check the GC selections again. 3094 if (!check_gc_consistency()) { 3095 return JNI_EINVAL; 3096 } 3097 3098 if (TieredCompilation) { 3099 set_tiered_flags(); 3100 } else { 3101 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3102 if (CompilationPolicyChoice >= 2) { 3103 vm_exit_during_initialization( 3104 "Incompatible compilation policy selected", NULL); 3105 } 3106 } 3107 3108 #ifndef KERNEL 3109 // Set heap size based on available physical memory 3110 set_heap_size(); 3111 // Set per-collector flags 3112 if (UseParallelGC || UseParallelOldGC) { 3113 set_parallel_gc_flags(); 3114 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3115 set_cms_and_parnew_gc_flags(); 3116 } else if (UseParNewGC) { // skipped if CMS is set above 3117 set_parnew_gc_flags(); 3118 } else if (UseG1GC) { 3119 set_g1_gc_flags(); 3120 } 3121 #endif // KERNEL 3122 3123 #ifdef SERIALGC 3124 assert(verify_serial_gc_flags(), "SerialGC unset"); 3125 #endif // SERIALGC 3126 3127 // Set bytecode rewriting flags 3128 set_bytecode_flags(); 3129 3130 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3131 set_aggressive_opts_flags(); 3132 3133 // Turn off biased locking for locking debug mode flags, 3134 // which are subtlely different from each other but neither works with 3135 // biased locking. 3136 if (UseHeavyMonitors 3137 #ifdef COMPILER1 3138 || !UseFastLocking 3139 #endif // COMPILER1 3140 ) { 3141 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3142 // flag set to true on command line; warn the user that they 3143 // can't enable biased locking here 3144 warning("Biased Locking is not supported with locking debug flags" 3145 "; ignoring UseBiasedLocking flag." ); 3146 } 3147 UseBiasedLocking = false; 3148 } 3149 3150 #ifdef CC_INTERP 3151 // Clear flags not supported by the C++ interpreter 3152 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3153 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3154 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3155 #endif // CC_INTERP 3156 3157 #ifdef COMPILER2 3158 if (!UseBiasedLocking || EmitSync != 0) { 3159 UseOptoBiasInlining = false; 3160 } 3161 if (!EliminateLocks) { 3162 EliminateNestedLocks = false; 3163 } 3164 #endif 3165 3166 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3167 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3168 DebugNonSafepoints = true; 3169 } 3170 3171 #ifndef PRODUCT 3172 if (CompileTheWorld) { 3173 // Force NmethodSweeper to sweep whole CodeCache each time. 3174 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3175 NmethodSweepFraction = 1; 3176 } 3177 } 3178 #endif 3179 3180 if (PrintCommandLineFlags) { 3181 CommandLineFlags::printSetFlags(tty); 3182 } 3183 3184 // Apply CPU specific policy for the BiasedLocking 3185 if (UseBiasedLocking) { 3186 if (!VM_Version::use_biased_locking() && 3187 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3188 UseBiasedLocking = false; 3189 } 3190 } 3191 3192 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3193 // but only if not already set on the commandline 3194 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3195 bool set = false; 3196 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3197 if (!set) { 3198 FLAG_SET_DEFAULT(PauseAtExit, true); 3199 } 3200 } 3201 3202 return JNI_OK; 3203 } 3204 3205 int Arguments::PropertyList_count(SystemProperty* pl) { 3206 int count = 0; 3207 while(pl != NULL) { 3208 count++; 3209 pl = pl->next(); 3210 } 3211 return count; 3212 } 3213 3214 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3215 assert(key != NULL, "just checking"); 3216 SystemProperty* prop; 3217 for (prop = pl; prop != NULL; prop = prop->next()) { 3218 if (strcmp(key, prop->key()) == 0) return prop->value(); 3219 } 3220 return NULL; 3221 } 3222 3223 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3224 int count = 0; 3225 const char* ret_val = NULL; 3226 3227 while(pl != NULL) { 3228 if(count >= index) { 3229 ret_val = pl->key(); 3230 break; 3231 } 3232 count++; 3233 pl = pl->next(); 3234 } 3235 3236 return ret_val; 3237 } 3238 3239 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3240 int count = 0; 3241 char* ret_val = NULL; 3242 3243 while(pl != NULL) { 3244 if(count >= index) { 3245 ret_val = pl->value(); 3246 break; 3247 } 3248 count++; 3249 pl = pl->next(); 3250 } 3251 3252 return ret_val; 3253 } 3254 3255 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3256 SystemProperty* p = *plist; 3257 if (p == NULL) { 3258 *plist = new_p; 3259 } else { 3260 while (p->next() != NULL) { 3261 p = p->next(); 3262 } 3263 p->set_next(new_p); 3264 } 3265 } 3266 3267 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3268 if (plist == NULL) 3269 return; 3270 3271 SystemProperty* new_p = new SystemProperty(k, v, true); 3272 PropertyList_add(plist, new_p); 3273 } 3274 3275 // This add maintains unique property key in the list. 3276 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3277 if (plist == NULL) 3278 return; 3279 3280 // If property key exist then update with new value. 3281 SystemProperty* prop; 3282 for (prop = *plist; prop != NULL; prop = prop->next()) { 3283 if (strcmp(k, prop->key()) == 0) { 3284 if (append) { 3285 prop->append_value(v); 3286 } else { 3287 prop->set_value(v); 3288 } 3289 return; 3290 } 3291 } 3292 3293 PropertyList_add(plist, k, v); 3294 } 3295 3296 #ifdef KERNEL 3297 char *Arguments::get_kernel_properties() { 3298 // Find properties starting with kernel and append them to string 3299 // We need to find out how long they are first because the URL's that they 3300 // might point to could get long. 3301 int length = 0; 3302 SystemProperty* prop; 3303 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3304 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3305 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3306 } 3307 } 3308 // Add one for null terminator. 3309 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 3310 if (length != 0) { 3311 int pos = 0; 3312 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3313 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3314 jio_snprintf(&props[pos], length-pos, 3315 "-D%s=%s ", prop->key(), prop->value()); 3316 pos = strlen(props); 3317 } 3318 } 3319 } 3320 // null terminate props in case of null 3321 props[length] = '\0'; 3322 return props; 3323 } 3324 #endif // KERNEL 3325 3326 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3327 // Returns true if all of the source pointed by src has been copied over to 3328 // the destination buffer pointed by buf. Otherwise, returns false. 3329 // Notes: 3330 // 1. If the length (buflen) of the destination buffer excluding the 3331 // NULL terminator character is not long enough for holding the expanded 3332 // pid characters, it also returns false instead of returning the partially 3333 // expanded one. 3334 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3335 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3336 char* buf, size_t buflen) { 3337 const char* p = src; 3338 char* b = buf; 3339 const char* src_end = &src[srclen]; 3340 char* buf_end = &buf[buflen - 1]; 3341 3342 while (p < src_end && b < buf_end) { 3343 if (*p == '%') { 3344 switch (*(++p)) { 3345 case '%': // "%%" ==> "%" 3346 *b++ = *p++; 3347 break; 3348 case 'p': { // "%p" ==> current process id 3349 // buf_end points to the character before the last character so 3350 // that we could write '\0' to the end of the buffer. 3351 size_t buf_sz = buf_end - b + 1; 3352 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3353 3354 // if jio_snprintf fails or the buffer is not long enough to hold 3355 // the expanded pid, returns false. 3356 if (ret < 0 || ret >= (int)buf_sz) { 3357 return false; 3358 } else { 3359 b += ret; 3360 assert(*b == '\0', "fail in copy_expand_pid"); 3361 if (p == src_end && b == buf_end + 1) { 3362 // reach the end of the buffer. 3363 return true; 3364 } 3365 } 3366 p++; 3367 break; 3368 } 3369 default : 3370 *b++ = '%'; 3371 } 3372 } else { 3373 *b++ = *p++; 3374 } 3375 } 3376 *b = '\0'; 3377 return (p == src_end); // return false if not all of the source was copied 3378 }