1 /* 2 * Copyright (c) 1997, 2010, 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 "incls/_precompiled.incl" 26 #include "incls/_arguments.cpp.incl" 27 28 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp" 29 #define DEFAULT_JAVA_LAUNCHER "generic" 30 31 char** Arguments::_jvm_flags_array = NULL; 32 int Arguments::_num_jvm_flags = 0; 33 char** Arguments::_jvm_args_array = NULL; 34 int Arguments::_num_jvm_args = 0; 35 char* Arguments::_java_command = NULL; 36 SystemProperty* Arguments::_system_properties = NULL; 37 const char* Arguments::_gc_log_filename = NULL; 38 bool Arguments::_has_profile = false; 39 bool Arguments::_has_alloc_profile = false; 40 uintx Arguments::_min_heap_size = 0; 41 Arguments::Mode Arguments::_mode = _mixed; 42 bool Arguments::_java_compiler = false; 43 bool Arguments::_xdebug_mode = false; 44 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 45 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 46 int Arguments::_sun_java_launcher_pid = -1; 47 48 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 49 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 50 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 51 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 52 bool Arguments::_ClipInlining = ClipInlining; 53 54 char* Arguments::SharedArchivePath = NULL; 55 56 AgentLibraryList Arguments::_libraryList; 57 AgentLibraryList Arguments::_agentList; 58 59 abort_hook_t Arguments::_abort_hook = NULL; 60 exit_hook_t Arguments::_exit_hook = NULL; 61 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 62 63 64 SystemProperty *Arguments::_java_ext_dirs = NULL; 65 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 66 SystemProperty *Arguments::_sun_boot_library_path = NULL; 67 SystemProperty *Arguments::_java_library_path = NULL; 68 SystemProperty *Arguments::_java_home = NULL; 69 SystemProperty *Arguments::_java_class_path = NULL; 70 SystemProperty *Arguments::_sun_boot_class_path = NULL; 71 72 char* Arguments::_meta_index_path = NULL; 73 char* Arguments::_meta_index_dir = NULL; 74 75 static bool force_client_mode = false; 76 77 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 78 79 static bool match_option(const JavaVMOption *option, const char* name, 80 const char** tail) { 81 int len = (int)strlen(name); 82 if (strncmp(option->optionString, name, len) == 0) { 83 *tail = option->optionString + len; 84 return true; 85 } else { 86 return false; 87 } 88 } 89 90 static void logOption(const char* opt) { 91 if (PrintVMOptions) { 92 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 93 } 94 } 95 96 // Process java launcher properties. 97 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 98 // See if sun.java.launcher or sun.java.launcher.pid is defined. 99 // Must do this before setting up other system properties, 100 // as some of them may depend on launcher type. 101 for (int index = 0; index < args->nOptions; index++) { 102 const JavaVMOption* option = args->options + index; 103 const char* tail; 104 105 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 106 process_java_launcher_argument(tail, option->extraInfo); 107 continue; 108 } 109 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 110 _sun_java_launcher_pid = atoi(tail); 111 continue; 112 } 113 } 114 } 115 116 // Initialize system properties key and value. 117 void Arguments::init_system_properties() { 118 119 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false)); 120 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 121 "Java Virtual Machine Specification", false)); 122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 123 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 125 126 // following are JVMTI agent writeable properties. 127 // Properties values are set to NULL and they are 128 // os specific they are initialized in os::init_system_properties_values(). 129 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 130 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 131 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 132 _java_library_path = new SystemProperty("java.library.path", NULL, true); 133 _java_home = new SystemProperty("java.home", NULL, true); 134 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 135 136 _java_class_path = new SystemProperty("java.class.path", "", true); 137 138 // Add to System Property list. 139 PropertyList_add(&_system_properties, _java_ext_dirs); 140 PropertyList_add(&_system_properties, _java_endorsed_dirs); 141 PropertyList_add(&_system_properties, _sun_boot_library_path); 142 PropertyList_add(&_system_properties, _java_library_path); 143 PropertyList_add(&_system_properties, _java_home); 144 PropertyList_add(&_system_properties, _java_class_path); 145 PropertyList_add(&_system_properties, _sun_boot_class_path); 146 147 // Set OS specific system properties values 148 os::init_system_properties_values(); 149 } 150 151 152 // Update/Initialize System properties after JDK version number is known 153 void Arguments::init_version_specific_system_properties() { 154 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor", 155 JDK_Version::is_gte_jdk17x_version() ? "Oracle Corporation" : "Sun Microsystems Inc.", false)); 156 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 157 } 158 159 /** 160 * Provide a slightly more user-friendly way of eliminating -XX flags. 161 * When a flag is eliminated, it can be added to this list in order to 162 * continue accepting this flag on the command-line, while issuing a warning 163 * and ignoring the value. Once the JDK version reaches the 'accept_until' 164 * limit, we flatly refuse to admit the existence of the flag. This allows 165 * a flag to die correctly over JDK releases using HSX. 166 */ 167 typedef struct { 168 const char* name; 169 JDK_Version obsoleted_in; // when the flag went away 170 JDK_Version accept_until; // which version to start denying the existence 171 } ObsoleteFlag; 172 173 static ObsoleteFlag obsolete_jvm_flags[] = { 174 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 175 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 176 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 177 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 178 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 179 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 180 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 181 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 182 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 183 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 184 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 185 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 186 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 187 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 188 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 189 { "DefaultInitialRAMFraction", 190 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 191 { "UseDepthFirstScavengeOrder", 192 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 193 { "HandlePromotionFailure", 194 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 195 { "MaxLiveObjectEvacuationRatio", 196 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 197 { NULL, JDK_Version(0), JDK_Version(0) } 198 }; 199 200 // Returns true if the flag is obsolete and fits into the range specified 201 // for being ignored. In the case that the flag is ignored, the 'version' 202 // value is filled in with the version number when the flag became 203 // obsolete so that that value can be displayed to the user. 204 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 205 int i = 0; 206 assert(version != NULL, "Must provide a version buffer"); 207 while (obsolete_jvm_flags[i].name != NULL) { 208 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 209 // <flag>=xxx form 210 // [-|+]<flag> form 211 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 212 ((s[0] == '+' || s[0] == '-') && 213 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 214 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 215 *version = flag_status.obsoleted_in; 216 return true; 217 } 218 } 219 i++; 220 } 221 return false; 222 } 223 224 // Constructs the system class path (aka boot class path) from the following 225 // components, in order: 226 // 227 // prefix // from -Xbootclasspath/p:... 228 // endorsed // the expansion of -Djava.endorsed.dirs=... 229 // base // from os::get_system_properties() or -Xbootclasspath= 230 // suffix // from -Xbootclasspath/a:... 231 // 232 // java.endorsed.dirs is a list of directories; any jar or zip files in the 233 // directories are added to the sysclasspath just before the base. 234 // 235 // This could be AllStatic, but it isn't needed after argument processing is 236 // complete. 237 class SysClassPath: public StackObj { 238 public: 239 SysClassPath(const char* base); 240 ~SysClassPath(); 241 242 inline void set_base(const char* base); 243 inline void add_prefix(const char* prefix); 244 inline void add_suffix_to_prefix(const char* suffix); 245 inline void add_suffix(const char* suffix); 246 inline void reset_path(const char* base); 247 248 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 249 // property. Must be called after all command-line arguments have been 250 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 251 // combined_path(). 252 void expand_endorsed(); 253 254 inline const char* get_base() const { return _items[_scp_base]; } 255 inline const char* get_prefix() const { return _items[_scp_prefix]; } 256 inline const char* get_suffix() const { return _items[_scp_suffix]; } 257 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 258 259 // Combine all the components into a single c-heap-allocated string; caller 260 // must free the string if/when no longer needed. 261 char* combined_path(); 262 263 private: 264 // Utility routines. 265 static char* add_to_path(const char* path, const char* str, bool prepend); 266 static char* add_jars_to_path(char* path, const char* directory); 267 268 inline void reset_item_at(int index); 269 270 // Array indices for the items that make up the sysclasspath. All except the 271 // base are allocated in the C heap and freed by this class. 272 enum { 273 _scp_prefix, // from -Xbootclasspath/p:... 274 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 275 _scp_base, // the default sysclasspath 276 _scp_suffix, // from -Xbootclasspath/a:... 277 _scp_nitems // the number of items, must be last. 278 }; 279 280 const char* _items[_scp_nitems]; 281 DEBUG_ONLY(bool _expansion_done;) 282 }; 283 284 SysClassPath::SysClassPath(const char* base) { 285 memset(_items, 0, sizeof(_items)); 286 _items[_scp_base] = base; 287 DEBUG_ONLY(_expansion_done = false;) 288 } 289 290 SysClassPath::~SysClassPath() { 291 // Free everything except the base. 292 for (int i = 0; i < _scp_nitems; ++i) { 293 if (i != _scp_base) reset_item_at(i); 294 } 295 DEBUG_ONLY(_expansion_done = false;) 296 } 297 298 inline void SysClassPath::set_base(const char* base) { 299 _items[_scp_base] = base; 300 } 301 302 inline void SysClassPath::add_prefix(const char* prefix) { 303 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 304 } 305 306 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 307 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 308 } 309 310 inline void SysClassPath::add_suffix(const char* suffix) { 311 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 312 } 313 314 inline void SysClassPath::reset_item_at(int index) { 315 assert(index < _scp_nitems && index != _scp_base, "just checking"); 316 if (_items[index] != NULL) { 317 FREE_C_HEAP_ARRAY(char, _items[index]); 318 _items[index] = NULL; 319 } 320 } 321 322 inline void SysClassPath::reset_path(const char* base) { 323 // Clear the prefix and suffix. 324 reset_item_at(_scp_prefix); 325 reset_item_at(_scp_suffix); 326 set_base(base); 327 } 328 329 //------------------------------------------------------------------------------ 330 331 void SysClassPath::expand_endorsed() { 332 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 333 334 const char* path = Arguments::get_property("java.endorsed.dirs"); 335 if (path == NULL) { 336 path = Arguments::get_endorsed_dir(); 337 assert(path != NULL, "no default for java.endorsed.dirs"); 338 } 339 340 char* expanded_path = NULL; 341 const char separator = *os::path_separator(); 342 const char* const end = path + strlen(path); 343 while (path < end) { 344 const char* tmp_end = strchr(path, separator); 345 if (tmp_end == NULL) { 346 expanded_path = add_jars_to_path(expanded_path, path); 347 path = end; 348 } else { 349 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1); 350 memcpy(dirpath, path, tmp_end - path); 351 dirpath[tmp_end - path] = '\0'; 352 expanded_path = add_jars_to_path(expanded_path, dirpath); 353 FREE_C_HEAP_ARRAY(char, dirpath); 354 path = tmp_end + 1; 355 } 356 } 357 _items[_scp_endorsed] = expanded_path; 358 DEBUG_ONLY(_expansion_done = true;) 359 } 360 361 // Combine the bootclasspath elements, some of which may be null, into a single 362 // c-heap-allocated string. 363 char* SysClassPath::combined_path() { 364 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 365 assert(_expansion_done, "must call expand_endorsed() first."); 366 367 size_t lengths[_scp_nitems]; 368 size_t total_len = 0; 369 370 const char separator = *os::path_separator(); 371 372 // Get the lengths. 373 int i; 374 for (i = 0; i < _scp_nitems; ++i) { 375 if (_items[i] != NULL) { 376 lengths[i] = strlen(_items[i]); 377 // Include space for the separator char (or a NULL for the last item). 378 total_len += lengths[i] + 1; 379 } 380 } 381 assert(total_len > 0, "empty sysclasspath not allowed"); 382 383 // Copy the _items to a single string. 384 char* cp = NEW_C_HEAP_ARRAY(char, total_len); 385 char* cp_tmp = cp; 386 for (i = 0; i < _scp_nitems; ++i) { 387 if (_items[i] != NULL) { 388 memcpy(cp_tmp, _items[i], lengths[i]); 389 cp_tmp += lengths[i]; 390 *cp_tmp++ = separator; 391 } 392 } 393 *--cp_tmp = '\0'; // Replace the extra separator. 394 return cp; 395 } 396 397 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 398 char* 399 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 400 char *cp; 401 402 assert(str != NULL, "just checking"); 403 if (path == NULL) { 404 size_t len = strlen(str) + 1; 405 cp = NEW_C_HEAP_ARRAY(char, len); 406 memcpy(cp, str, len); // copy the trailing null 407 } else { 408 const char separator = *os::path_separator(); 409 size_t old_len = strlen(path); 410 size_t str_len = strlen(str); 411 size_t len = old_len + str_len + 2; 412 413 if (prepend) { 414 cp = NEW_C_HEAP_ARRAY(char, len); 415 char* cp_tmp = cp; 416 memcpy(cp_tmp, str, str_len); 417 cp_tmp += str_len; 418 *cp_tmp = separator; 419 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 420 FREE_C_HEAP_ARRAY(char, path); 421 } else { 422 cp = REALLOC_C_HEAP_ARRAY(char, path, len); 423 char* cp_tmp = cp + old_len; 424 *cp_tmp = separator; 425 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 426 } 427 } 428 return cp; 429 } 430 431 // Scan the directory and append any jar or zip files found to path. 432 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 433 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 434 DIR* dir = os::opendir(directory); 435 if (dir == NULL) return path; 436 437 char dir_sep[2] = { '\0', '\0' }; 438 size_t directory_len = strlen(directory); 439 const char fileSep = *os::file_separator(); 440 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 441 442 /* Scan the directory for jars/zips, appending them to path. */ 443 struct dirent *entry; 444 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory)); 445 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 446 const char* name = entry->d_name; 447 const char* ext = name + strlen(name) - 4; 448 bool isJarOrZip = ext > name && 449 (os::file_name_strcmp(ext, ".jar") == 0 || 450 os::file_name_strcmp(ext, ".zip") == 0); 451 if (isJarOrZip) { 452 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name)); 453 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 454 path = add_to_path(path, jarpath, false); 455 FREE_C_HEAP_ARRAY(char, jarpath); 456 } 457 } 458 FREE_C_HEAP_ARRAY(char, dbuf); 459 os::closedir(dir); 460 return path; 461 } 462 463 // Parses a memory size specification string. 464 static bool atomull(const char *s, julong* result) { 465 julong n = 0; 466 int args_read = sscanf(s, os::julong_format_specifier(), &n); 467 if (args_read != 1) { 468 return false; 469 } 470 while (*s != '\0' && isdigit(*s)) { 471 s++; 472 } 473 // 4705540: illegal if more characters are found after the first non-digit 474 if (strlen(s) > 1) { 475 return false; 476 } 477 switch (*s) { 478 case 'T': case 't': 479 *result = n * G * K; 480 // Check for overflow. 481 if (*result/((julong)G * K) != n) return false; 482 return true; 483 case 'G': case 'g': 484 *result = n * G; 485 if (*result/G != n) return false; 486 return true; 487 case 'M': case 'm': 488 *result = n * M; 489 if (*result/M != n) return false; 490 return true; 491 case 'K': case 'k': 492 *result = n * K; 493 if (*result/K != n) return false; 494 return true; 495 case '\0': 496 *result = n; 497 return true; 498 default: 499 return false; 500 } 501 } 502 503 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 504 if (size < min_size) return arg_too_small; 505 // Check that size will fit in a size_t (only relevant on 32-bit) 506 if (size > max_uintx) return arg_too_big; 507 return arg_in_range; 508 } 509 510 // Describe an argument out of range error 511 void Arguments::describe_range_error(ArgsRange errcode) { 512 switch(errcode) { 513 case arg_too_big: 514 jio_fprintf(defaultStream::error_stream(), 515 "The specified size exceeds the maximum " 516 "representable size.\n"); 517 break; 518 case arg_too_small: 519 case arg_unreadable: 520 case arg_in_range: 521 // do nothing for now 522 break; 523 default: 524 ShouldNotReachHere(); 525 } 526 } 527 528 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 529 return CommandLineFlags::boolAtPut(name, &value, origin); 530 } 531 532 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 533 double v; 534 if (sscanf(value, "%lf", &v) != 1) { 535 return false; 536 } 537 538 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 539 return true; 540 } 541 return false; 542 } 543 544 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 545 julong v; 546 intx intx_v; 547 bool is_neg = false; 548 // Check the sign first since atomull() parses only unsigned values. 549 if (*value == '-') { 550 if (!CommandLineFlags::intxAt(name, &intx_v)) { 551 return false; 552 } 553 value++; 554 is_neg = true; 555 } 556 if (!atomull(value, &v)) { 557 return false; 558 } 559 intx_v = (intx) v; 560 if (is_neg) { 561 intx_v = -intx_v; 562 } 563 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 564 return true; 565 } 566 uintx uintx_v = (uintx) v; 567 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 568 return true; 569 } 570 uint64_t uint64_t_v = (uint64_t) v; 571 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 572 return true; 573 } 574 return false; 575 } 576 577 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 578 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 579 // Contract: CommandLineFlags always returns a pointer that needs freeing. 580 FREE_C_HEAP_ARRAY(char, value); 581 return true; 582 } 583 584 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 585 const char* old_value = ""; 586 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 587 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 588 size_t new_len = strlen(new_value); 589 const char* value; 590 char* free_this_too = NULL; 591 if (old_len == 0) { 592 value = new_value; 593 } else if (new_len == 0) { 594 value = old_value; 595 } else { 596 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1); 597 // each new setting adds another LINE to the switch: 598 sprintf(buf, "%s\n%s", old_value, new_value); 599 value = buf; 600 free_this_too = buf; 601 } 602 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 603 // CommandLineFlags always returns a pointer that needs freeing. 604 FREE_C_HEAP_ARRAY(char, value); 605 if (free_this_too != NULL) { 606 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 607 FREE_C_HEAP_ARRAY(char, free_this_too); 608 } 609 return true; 610 } 611 612 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 613 614 // range of acceptable characters spelled out for portability reasons 615 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 616 #define BUFLEN 255 617 char name[BUFLEN+1]; 618 char dummy; 619 620 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 621 return set_bool_flag(name, false, origin); 622 } 623 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 624 return set_bool_flag(name, true, origin); 625 } 626 627 char punct; 628 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 629 const char* value = strchr(arg, '=') + 1; 630 Flag* flag = Flag::find_flag(name, strlen(name)); 631 if (flag != NULL && flag->is_ccstr()) { 632 if (flag->ccstr_accumulates()) { 633 return append_to_string_flag(name, value, origin); 634 } else { 635 if (value[0] == '\0') { 636 value = NULL; 637 } 638 return set_string_flag(name, value, origin); 639 } 640 } 641 } 642 643 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 644 const char* value = strchr(arg, '=') + 1; 645 // -XX:Foo:=xxx will reset the string flag to the given value. 646 if (value[0] == '\0') { 647 value = NULL; 648 } 649 return set_string_flag(name, value, origin); 650 } 651 652 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 653 #define SIGNED_NUMBER_RANGE "[-0123456789]" 654 #define NUMBER_RANGE "[0123456789]" 655 char value[BUFLEN + 1]; 656 char value2[BUFLEN + 1]; 657 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 658 // Looks like a floating-point number -- try again with more lenient format string 659 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 660 return set_fp_numeric_flag(name, value, origin); 661 } 662 } 663 664 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 665 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 666 return set_numeric_flag(name, value, origin); 667 } 668 669 return false; 670 } 671 672 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 673 assert(bldarray != NULL, "illegal argument"); 674 675 if (arg == NULL) { 676 return; 677 } 678 679 int index = *count; 680 681 // expand the array and add arg to the last element 682 (*count)++; 683 if (*bldarray == NULL) { 684 *bldarray = NEW_C_HEAP_ARRAY(char*, *count); 685 } else { 686 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count); 687 } 688 (*bldarray)[index] = strdup(arg); 689 } 690 691 void Arguments::build_jvm_args(const char* arg) { 692 add_string(&_jvm_args_array, &_num_jvm_args, arg); 693 } 694 695 void Arguments::build_jvm_flags(const char* arg) { 696 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 697 } 698 699 // utility function to return a string that concatenates all 700 // strings in a given char** array 701 const char* Arguments::build_resource_string(char** args, int count) { 702 if (args == NULL || count == 0) { 703 return NULL; 704 } 705 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 706 for (int i = 1; i < count; i++) { 707 length += strlen(args[i]) + 1; // add 1 for a space 708 } 709 char* s = NEW_RESOURCE_ARRAY(char, length); 710 strcpy(s, args[0]); 711 for (int j = 1; j < count; j++) { 712 strcat(s, " "); 713 strcat(s, args[j]); 714 } 715 return (const char*) s; 716 } 717 718 void Arguments::print_on(outputStream* st) { 719 st->print_cr("VM Arguments:"); 720 if (num_jvm_flags() > 0) { 721 st->print("jvm_flags: "); print_jvm_flags_on(st); 722 } 723 if (num_jvm_args() > 0) { 724 st->print("jvm_args: "); print_jvm_args_on(st); 725 } 726 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 727 st->print_cr("Launcher Type: %s", _sun_java_launcher); 728 } 729 730 void Arguments::print_jvm_flags_on(outputStream* st) { 731 if (_num_jvm_flags > 0) { 732 for (int i=0; i < _num_jvm_flags; i++) { 733 st->print("%s ", _jvm_flags_array[i]); 734 } 735 st->print_cr(""); 736 } 737 } 738 739 void Arguments::print_jvm_args_on(outputStream* st) { 740 if (_num_jvm_args > 0) { 741 for (int i=0; i < _num_jvm_args; i++) { 742 st->print("%s ", _jvm_args_array[i]); 743 } 744 st->print_cr(""); 745 } 746 } 747 748 bool Arguments::process_argument(const char* arg, 749 jboolean ignore_unrecognized, FlagValueOrigin origin) { 750 751 JDK_Version since = JDK_Version(); 752 753 if (parse_argument(arg, origin)) { 754 // do nothing 755 } else if (is_newly_obsolete(arg, &since)) { 756 enum { bufsize = 256 }; 757 char buffer[bufsize]; 758 since.to_string(buffer, bufsize); 759 jio_fprintf(defaultStream::error_stream(), 760 "Warning: The flag %s has been EOL'd as of %s and will" 761 " be ignored\n", arg, buffer); 762 } else { 763 if (!ignore_unrecognized) { 764 jio_fprintf(defaultStream::error_stream(), 765 "Unrecognized VM option '%s'\n", arg); 766 // allow for commandline "commenting out" options like -XX:#+Verbose 767 if (strlen(arg) == 0 || arg[0] != '#') { 768 return false; 769 } 770 } 771 } 772 return true; 773 } 774 775 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 776 FILE* stream = fopen(file_name, "rb"); 777 if (stream == NULL) { 778 if (should_exist) { 779 jio_fprintf(defaultStream::error_stream(), 780 "Could not open settings file %s\n", file_name); 781 return false; 782 } else { 783 return true; 784 } 785 } 786 787 char token[1024]; 788 int pos = 0; 789 790 bool in_white_space = true; 791 bool in_comment = false; 792 bool in_quote = false; 793 char quote_c = 0; 794 bool result = true; 795 796 int c = getc(stream); 797 while(c != EOF) { 798 if (in_white_space) { 799 if (in_comment) { 800 if (c == '\n') in_comment = false; 801 } else { 802 if (c == '#') in_comment = true; 803 else if (!isspace(c)) { 804 in_white_space = false; 805 token[pos++] = c; 806 } 807 } 808 } else { 809 if (c == '\n' || (!in_quote && isspace(c))) { 810 // token ends at newline, or at unquoted whitespace 811 // this allows a way to include spaces in string-valued options 812 token[pos] = '\0'; 813 logOption(token); 814 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 815 build_jvm_flags(token); 816 pos = 0; 817 in_white_space = true; 818 in_quote = false; 819 } else if (!in_quote && (c == '\'' || c == '"')) { 820 in_quote = true; 821 quote_c = c; 822 } else if (in_quote && (c == quote_c)) { 823 in_quote = false; 824 } else { 825 token[pos++] = c; 826 } 827 } 828 c = getc(stream); 829 } 830 if (pos > 0) { 831 token[pos] = '\0'; 832 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 833 build_jvm_flags(token); 834 } 835 fclose(stream); 836 return result; 837 } 838 839 //============================================================================================================= 840 // Parsing of properties (-D) 841 842 const char* Arguments::get_property(const char* key) { 843 return PropertyList_get_value(system_properties(), key); 844 } 845 846 bool Arguments::add_property(const char* prop) { 847 const char* eq = strchr(prop, '='); 848 char* key; 849 // ns must be static--its address may be stored in a SystemProperty object. 850 const static char ns[1] = {0}; 851 char* value = (char *)ns; 852 853 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 854 key = AllocateHeap(key_len + 1, "add_property"); 855 strncpy(key, prop, key_len); 856 key[key_len] = '\0'; 857 858 if (eq != NULL) { 859 size_t value_len = strlen(prop) - key_len - 1; 860 value = AllocateHeap(value_len + 1, "add_property"); 861 strncpy(value, &prop[key_len + 1], value_len + 1); 862 } 863 864 if (strcmp(key, "java.compiler") == 0) { 865 process_java_compiler_argument(value); 866 FreeHeap(key); 867 if (eq != NULL) { 868 FreeHeap(value); 869 } 870 return true; 871 } else if (strcmp(key, "sun.java.command") == 0) { 872 _java_command = value; 873 874 // don't add this property to the properties exposed to the java application 875 FreeHeap(key); 876 return true; 877 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 878 // launcher.pid property is private and is processed 879 // in process_sun_java_launcher_properties(); 880 // the sun.java.launcher property is passed on to the java application 881 FreeHeap(key); 882 if (eq != NULL) { 883 FreeHeap(value); 884 } 885 return true; 886 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 887 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 888 // its value without going through the property list or making a Java call. 889 _java_vendor_url_bug = value; 890 } else if (strcmp(key, "sun.boot.library.path") == 0) { 891 PropertyList_unique_add(&_system_properties, key, value, true); 892 return true; 893 } 894 // Create new property and add at the end of the list 895 PropertyList_unique_add(&_system_properties, key, value); 896 return true; 897 } 898 899 //=========================================================================================================== 900 // Setting int/mixed/comp mode flags 901 902 void Arguments::set_mode_flags(Mode mode) { 903 // Set up default values for all flags. 904 // If you add a flag to any of the branches below, 905 // add a default value for it here. 906 set_java_compiler(false); 907 _mode = mode; 908 909 // Ensure Agent_OnLoad has the correct initial values. 910 // This may not be the final mode; mode may change later in onload phase. 911 PropertyList_unique_add(&_system_properties, "java.vm.info", 912 (char*)Abstract_VM_Version::vm_info_string(), false); 913 914 UseInterpreter = true; 915 UseCompiler = true; 916 UseLoopCounter = true; 917 918 // Default values may be platform/compiler dependent - 919 // use the saved values 920 ClipInlining = Arguments::_ClipInlining; 921 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 922 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 923 BackgroundCompilation = Arguments::_BackgroundCompilation; 924 925 // Change from defaults based on mode 926 switch (mode) { 927 default: 928 ShouldNotReachHere(); 929 break; 930 case _int: 931 UseCompiler = false; 932 UseLoopCounter = false; 933 AlwaysCompileLoopMethods = false; 934 UseOnStackReplacement = false; 935 break; 936 case _mixed: 937 // same as default 938 break; 939 case _comp: 940 UseInterpreter = false; 941 BackgroundCompilation = false; 942 ClipInlining = false; 943 break; 944 } 945 } 946 947 // Conflict: required to use shared spaces (-Xshare:on), but 948 // incompatible command line options were chosen. 949 950 static void no_shared_spaces() { 951 if (RequireSharedSpaces) { 952 jio_fprintf(defaultStream::error_stream(), 953 "Class data sharing is inconsistent with other specified options.\n"); 954 vm_exit_during_initialization("Unable to use shared archive.", NULL); 955 } else { 956 FLAG_SET_DEFAULT(UseSharedSpaces, false); 957 } 958 } 959 960 void Arguments::check_compressed_oops_compat() { 961 #ifdef _LP64 962 assert(UseCompressedOops, "Precondition"); 963 // Is it on by default or set on ergonomically 964 bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops); 965 966 // If dumping an archive or forcing its use, disable compressed oops if possible 967 if (DumpSharedSpaces || RequireSharedSpaces) { 968 if (is_on_by_default) { 969 FLAG_SET_DEFAULT(UseCompressedOops, false); 970 return; 971 } else { 972 vm_exit_during_initialization( 973 "Class Data Sharing is not supported with compressed oops yet", NULL); 974 } 975 } else if (UseSharedSpaces) { 976 // UseSharedSpaces is on by default. With compressed oops, we turn it off. 977 FLAG_SET_DEFAULT(UseSharedSpaces, false); 978 } 979 #endif // _LP64 980 } 981 982 void Arguments::set_tiered_flags() { 983 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 984 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2); 985 } 986 if (CompilationPolicyChoice < 2) { 987 vm_exit_during_initialization( 988 "Incompatible compilation policy selected", NULL); 989 } 990 // Increase the code cache size - tiered compiles a lot more. 991 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 992 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 993 } 994 } 995 996 #ifndef KERNEL 997 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 998 // if it's not explictly set or unset. If the user has chosen 999 // UseParNewGC and not explicitly set ParallelGCThreads we 1000 // set it, unless this is a single cpu machine. 1001 void Arguments::set_parnew_gc_flags() { 1002 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1003 "control point invariant"); 1004 assert(UseParNewGC, "Error"); 1005 1006 // Turn off AdaptiveSizePolicy by default for parnew until it is 1007 // complete. 1008 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1009 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1010 } 1011 1012 if (ParallelGCThreads == 0) { 1013 FLAG_SET_DEFAULT(ParallelGCThreads, 1014 Abstract_VM_Version::parallel_worker_threads()); 1015 if (ParallelGCThreads == 1) { 1016 FLAG_SET_DEFAULT(UseParNewGC, false); 1017 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 1018 } 1019 } 1020 if (UseParNewGC) { 1021 // CDS doesn't work with ParNew yet 1022 no_shared_spaces(); 1023 1024 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1025 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1026 // we set them to 1024 and 1024. 1027 // See CR 6362902. 1028 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1029 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1030 } 1031 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1032 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1033 } 1034 1035 // AlwaysTenure flag should make ParNew promote all at first collection. 1036 // See CR 6362902. 1037 if (AlwaysTenure) { 1038 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 1039 } 1040 // When using compressed oops, we use local overflow stacks, 1041 // rather than using a global overflow list chained through 1042 // the klass word of the object's pre-image. 1043 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1044 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1045 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1046 } 1047 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1048 } 1049 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1050 } 1051 } 1052 1053 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1054 // sparc/solaris for certain applications, but would gain from 1055 // further optimization and tuning efforts, and would almost 1056 // certainly gain from analysis of platform and environment. 1057 void Arguments::set_cms_and_parnew_gc_flags() { 1058 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1059 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1060 1061 // If we are using CMS, we prefer to UseParNewGC, 1062 // unless explicitly forbidden. 1063 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1064 FLAG_SET_ERGO(bool, UseParNewGC, true); 1065 } 1066 1067 // Turn off AdaptiveSizePolicy by default for cms until it is 1068 // complete. 1069 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1070 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1071 } 1072 1073 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1074 // as needed. 1075 if (UseParNewGC) { 1076 set_parnew_gc_flags(); 1077 } 1078 1079 // Now make adjustments for CMS 1080 size_t young_gen_per_worker; 1081 intx new_ratio; 1082 size_t min_new_default; 1083 intx tenuring_default; 1084 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0 1085 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) { 1086 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M); 1087 } 1088 young_gen_per_worker = 4*M; 1089 new_ratio = (intx)15; 1090 min_new_default = 4*M; 1091 tenuring_default = (intx)0; 1092 } else { // new defaults: "new" as of 6.0 1093 young_gen_per_worker = CMSYoungGenPerWorker; 1094 new_ratio = (intx)7; 1095 min_new_default = 16*M; 1096 tenuring_default = (intx)4; 1097 } 1098 1099 // Preferred young gen size for "short" pauses 1100 const uintx parallel_gc_threads = 1101 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1102 const size_t preferred_max_new_size_unaligned = 1103 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads); 1104 const size_t preferred_max_new_size = 1105 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1106 1107 // Unless explicitly requested otherwise, size young gen 1108 // for "short" pauses ~ 4M*ParallelGCThreads 1109 1110 // If either MaxNewSize or NewRatio is set on the command line, 1111 // assume the user is trying to set the size of the young gen. 1112 1113 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1114 1115 // Set MaxNewSize to our calculated preferred_max_new_size unless 1116 // NewSize was set on the command line and it is larger than 1117 // preferred_max_new_size. 1118 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1119 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1120 } else { 1121 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1122 } 1123 if (PrintGCDetails && Verbose) { 1124 // Too early to use gclog_or_tty 1125 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1126 } 1127 1128 // Unless explicitly requested otherwise, prefer a large 1129 // Old to Young gen size so as to shift the collection load 1130 // to the old generation concurrent collector 1131 1132 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio) 1133 // then NewSize and OldSize may be calculated. That would 1134 // generally lead to some differences with ParNewGC for which 1135 // there was no obvious reason. Also limit to the case where 1136 // MaxNewSize has not been set. 1137 1138 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio)); 1139 1140 // Code along this path potentially sets NewSize and OldSize 1141 1142 // Calculate the desired minimum size of the young gen but if 1143 // NewSize has been set on the command line, use it here since 1144 // it should be the final value. 1145 size_t min_new; 1146 if (FLAG_IS_DEFAULT(NewSize)) { 1147 min_new = align_size_up(ScaleForWordSize(min_new_default), 1148 os::vm_page_size()); 1149 } else { 1150 min_new = NewSize; 1151 } 1152 size_t prev_initial_size = InitialHeapSize; 1153 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) { 1154 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize); 1155 // Currently minimum size and the initial heap sizes are the same. 1156 set_min_heap_size(InitialHeapSize); 1157 if (PrintGCDetails && Verbose) { 1158 warning("Initial heap size increased to " SIZE_FORMAT " M from " 1159 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.", 1160 InitialHeapSize/M, prev_initial_size/M); 1161 } 1162 } 1163 1164 // MaxHeapSize is aligned down in collectorPolicy 1165 size_t max_heap = 1166 align_size_down(MaxHeapSize, 1167 CardTableRS::ct_max_alignment_constraint()); 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 if (max_heap > min_new) { 1177 // Unless explicitly requested otherwise, make young gen 1178 // at least min_new, and at most preferred_max_new_size. 1179 if (FLAG_IS_DEFAULT(NewSize)) { 1180 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1181 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1182 if (PrintGCDetails && Verbose) { 1183 // Too early to use gclog_or_tty 1184 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize); 1185 } 1186 } 1187 // Unless explicitly requested otherwise, size old gen 1188 // so that it's at least 3X of NewSize to begin with; 1189 // later NewRatio will decide how it grows; see above. 1190 if (FLAG_IS_DEFAULT(OldSize)) { 1191 if (max_heap > NewSize) { 1192 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize)); 1193 if (PrintGCDetails && Verbose) { 1194 // Too early to use gclog_or_tty 1195 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize); 1196 } 1197 } 1198 } 1199 } 1200 } 1201 // Unless explicitly requested otherwise, definitely 1202 // promote all objects surviving "tenuring_default" scavenges. 1203 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1204 FLAG_IS_DEFAULT(SurvivorRatio)) { 1205 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1206 } 1207 // If we decided above (or user explicitly requested) 1208 // `promote all' (via MaxTenuringThreshold := 0), 1209 // prefer minuscule survivor spaces so as not to waste 1210 // space for (non-existent) survivors 1211 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1212 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1213 } 1214 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1215 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1216 // This is done in order to make ParNew+CMS configuration to work 1217 // with YoungPLABSize and OldPLABSize options. 1218 // See CR 6362902. 1219 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1220 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1221 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1222 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1223 // the value (either from the command line or ergonomics) of 1224 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1225 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1226 } else { 1227 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1228 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1229 // we'll let it to take precedence. 1230 jio_fprintf(defaultStream::error_stream(), 1231 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1232 " options are specified for the CMS collector." 1233 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1234 } 1235 } 1236 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1237 // OldPLAB sizing manually turned off: Use a larger default setting, 1238 // unless it was manually specified. This is because a too-low value 1239 // will slow down scavenges. 1240 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1241 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1242 } 1243 } 1244 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1245 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1246 // If either of the static initialization defaults have changed, note this 1247 // modification. 1248 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1249 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1250 } 1251 if (PrintGCDetails && Verbose) { 1252 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1253 MarkStackSize / K, MarkStackSizeMax / K); 1254 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1255 } 1256 } 1257 #endif // KERNEL 1258 1259 void set_object_alignment() { 1260 // Object alignment. 1261 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1262 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1263 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1264 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1265 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1266 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1267 1268 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1269 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1270 1271 // Oop encoding heap max 1272 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1273 1274 #ifndef KERNEL 1275 // Set CMS global values 1276 CompactibleFreeListSpace::set_cms_values(); 1277 #endif // KERNEL 1278 } 1279 1280 bool verify_object_alignment() { 1281 // Object alignment. 1282 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1283 jio_fprintf(defaultStream::error_stream(), 1284 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1285 (int)ObjectAlignmentInBytes); 1286 return false; 1287 } 1288 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1289 jio_fprintf(defaultStream::error_stream(), 1290 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1291 (int)ObjectAlignmentInBytes, BytesPerLong); 1292 return false; 1293 } 1294 // It does not make sense to have big object alignment 1295 // since a space lost due to alignment will be greater 1296 // then a saved space from compressed oops. 1297 if ((int)ObjectAlignmentInBytes > 256) { 1298 jio_fprintf(defaultStream::error_stream(), 1299 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n", 1300 (int)ObjectAlignmentInBytes); 1301 return false; 1302 } 1303 // In case page size is very small. 1304 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1305 jio_fprintf(defaultStream::error_stream(), 1306 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n", 1307 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1308 return false; 1309 } 1310 return true; 1311 } 1312 1313 inline uintx max_heap_for_compressed_oops() { 1314 // Avoid sign flip. 1315 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) { 1316 return 0; 1317 } 1318 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1319 NOT_LP64(ShouldNotReachHere(); return 0); 1320 } 1321 1322 bool Arguments::should_auto_select_low_pause_collector() { 1323 if (UseAutoGCSelectPolicy && 1324 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1325 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1326 if (PrintGCDetails) { 1327 // Cannot use gclog_or_tty yet. 1328 tty->print_cr("Automatic selection of the low pause collector" 1329 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1330 } 1331 return true; 1332 } 1333 return false; 1334 } 1335 1336 void Arguments::set_ergonomics_flags() { 1337 // Parallel GC is not compatible with sharing. If one specifies 1338 // that they want sharing explicitly, do not set ergonomics flags. 1339 if (DumpSharedSpaces || ForceSharedSpaces) { 1340 return; 1341 } 1342 1343 if (os::is_server_class_machine() && !force_client_mode ) { 1344 // If no other collector is requested explicitly, 1345 // let the VM select the collector based on 1346 // machine class and automatic selection policy. 1347 if (!UseSerialGC && 1348 !UseConcMarkSweepGC && 1349 !UseG1GC && 1350 !UseParNewGC && 1351 !DumpSharedSpaces && 1352 FLAG_IS_DEFAULT(UseParallelGC)) { 1353 if (should_auto_select_low_pause_collector()) { 1354 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1355 } else { 1356 FLAG_SET_ERGO(bool, UseParallelGC, true); 1357 } 1358 no_shared_spaces(); 1359 } 1360 } 1361 1362 #ifndef ZERO 1363 #ifdef _LP64 1364 // Check that UseCompressedOops can be set with the max heap size allocated 1365 // by ergonomics. 1366 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1367 #if !defined(COMPILER1) || defined(TIERED) 1368 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) { 1369 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1370 } 1371 #endif 1372 #ifdef _WIN64 1373 if (UseLargePages && UseCompressedOops) { 1374 // Cannot allocate guard pages for implicit checks in indexed addressing 1375 // mode, when large pages are specified on windows. 1376 // This flag could be switched ON if narrow oop base address is set to 0, 1377 // see code in Universe::initialize_heap(). 1378 Universe::set_narrow_oop_use_implicit_null_checks(false); 1379 } 1380 #endif // _WIN64 1381 } else { 1382 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1383 warning("Max heap size too large for Compressed Oops"); 1384 FLAG_SET_DEFAULT(UseCompressedOops, false); 1385 } 1386 } 1387 // Also checks that certain machines are slower with compressed oops 1388 // in vm_version initialization code. 1389 #endif // _LP64 1390 #endif // !ZERO 1391 } 1392 1393 void Arguments::set_parallel_gc_flags() { 1394 assert(UseParallelGC || UseParallelOldGC, "Error"); 1395 // If parallel old was requested, automatically enable parallel scavenge. 1396 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) { 1397 FLAG_SET_DEFAULT(UseParallelGC, true); 1398 } 1399 1400 // If no heap maximum was requested explicitly, use some reasonable fraction 1401 // of the physical memory, up to a maximum of 1GB. 1402 if (UseParallelGC) { 1403 FLAG_SET_ERGO(uintx, ParallelGCThreads, 1404 Abstract_VM_Version::parallel_worker_threads()); 1405 1406 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1407 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1408 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1409 // See CR 6362902 for details. 1410 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1411 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1412 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1413 } 1414 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1415 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1416 } 1417 } 1418 1419 if (UseParallelOldGC) { 1420 // Par compact uses lower default values since they are treated as 1421 // minimums. These are different defaults because of the different 1422 // interpretation and are not ergonomically set. 1423 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1424 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1425 } 1426 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1427 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1428 } 1429 } 1430 } 1431 } 1432 1433 void Arguments::set_g1_gc_flags() { 1434 assert(UseG1GC, "Error"); 1435 #ifdef COMPILER1 1436 FastTLABRefill = false; 1437 #endif 1438 FLAG_SET_DEFAULT(ParallelGCThreads, 1439 Abstract_VM_Version::parallel_worker_threads()); 1440 if (ParallelGCThreads == 0) { 1441 FLAG_SET_DEFAULT(ParallelGCThreads, 1442 Abstract_VM_Version::parallel_worker_threads()); 1443 } 1444 no_shared_spaces(); 1445 1446 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1447 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1448 } 1449 if (PrintGCDetails && Verbose) { 1450 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1451 MarkStackSize / K, MarkStackSizeMax / K); 1452 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1453 } 1454 1455 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1456 // In G1, we want the default GC overhead goal to be higher than 1457 // say in PS. So we set it here to 10%. Otherwise the heap might 1458 // be expanded more aggressively than we would like it to. In 1459 // fact, even 10% seems to not be high enough in some cases 1460 // (especially small GC stress tests that the main thing they do 1461 // is allocation). We might consider increase it further. 1462 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1463 } 1464 } 1465 1466 void Arguments::set_heap_size() { 1467 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1468 // Deprecated flag 1469 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1470 } 1471 1472 const julong phys_mem = 1473 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1474 : (julong)MaxRAM; 1475 1476 // If the maximum heap size has not been set with -Xmx, 1477 // then set it as fraction of the size of physical memory, 1478 // respecting the maximum and minimum sizes of the heap. 1479 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1480 julong reasonable_max = phys_mem / MaxRAMFraction; 1481 1482 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1483 // Small physical memory, so use a minimum fraction of it for the heap 1484 reasonable_max = phys_mem / MinRAMFraction; 1485 } else { 1486 // Not-small physical memory, so require a heap at least 1487 // as large as MaxHeapSize 1488 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1489 } 1490 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1491 // Limit the heap size to ErgoHeapSizeLimit 1492 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1493 } 1494 if (UseCompressedOops) { 1495 // Limit the heap size to the maximum possible when using compressed oops 1496 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1497 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1498 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1499 // but it should be not less than default MaxHeapSize. 1500 max_coop_heap -= HeapBaseMinAddress; 1501 } 1502 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1503 } 1504 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1505 1506 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1507 // An initial heap size was specified on the command line, 1508 // so be sure that the maximum size is consistent. Done 1509 // after call to allocatable_physical_memory because that 1510 // method might reduce the allocation size. 1511 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1512 } 1513 1514 if (PrintGCDetails && Verbose) { 1515 // Cannot use gclog_or_tty yet. 1516 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1517 } 1518 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1519 } 1520 1521 // If the initial_heap_size has not been set with InitialHeapSize 1522 // or -Xms, then set it as fraction of the size of physical memory, 1523 // respecting the maximum and minimum sizes of the heap. 1524 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1525 julong reasonable_minimum = (julong)(OldSize + NewSize); 1526 1527 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1528 1529 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1530 1531 julong reasonable_initial = phys_mem / InitialRAMFraction; 1532 1533 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1534 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1535 1536 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1537 1538 if (PrintGCDetails && Verbose) { 1539 // Cannot use gclog_or_tty yet. 1540 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1541 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1542 } 1543 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1544 set_min_heap_size((uintx)reasonable_minimum); 1545 } 1546 } 1547 1548 // This must be called after ergonomics because we want bytecode rewriting 1549 // if the server compiler is used, or if UseSharedSpaces is disabled. 1550 void Arguments::set_bytecode_flags() { 1551 // Better not attempt to store into a read-only space. 1552 if (UseSharedSpaces) { 1553 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1554 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1555 } 1556 1557 if (!RewriteBytecodes) { 1558 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1559 } 1560 } 1561 1562 // Aggressive optimization flags -XX:+AggressiveOpts 1563 void Arguments::set_aggressive_opts_flags() { 1564 #ifdef COMPILER2 1565 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1566 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1567 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1568 } 1569 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1570 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1571 } 1572 1573 // Feed the cache size setting into the JDK 1574 char buffer[1024]; 1575 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1576 add_property(buffer); 1577 } 1578 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1579 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1580 } 1581 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1582 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1583 } 1584 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) { 1585 FLAG_SET_DEFAULT(OptimizeStringConcat, true); 1586 } 1587 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) { 1588 FLAG_SET_DEFAULT(OptimizeFill, true); 1589 } 1590 #endif 1591 1592 if (AggressiveOpts) { 1593 // Sample flag setting code 1594 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1595 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1596 // } 1597 } 1598 } 1599 1600 //=========================================================================================================== 1601 // Parsing of java.compiler property 1602 1603 void Arguments::process_java_compiler_argument(char* arg) { 1604 // For backwards compatibility, Djava.compiler=NONE or "" 1605 // causes us to switch to -Xint mode UNLESS -Xdebug 1606 // is also specified. 1607 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1608 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1609 } 1610 } 1611 1612 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1613 _sun_java_launcher = strdup(launcher); 1614 } 1615 1616 bool Arguments::created_by_java_launcher() { 1617 assert(_sun_java_launcher != NULL, "property must have value"); 1618 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1619 } 1620 1621 //=========================================================================================================== 1622 // Parsing of main arguments 1623 1624 bool Arguments::verify_interval(uintx val, uintx min, 1625 uintx max, const char* name) { 1626 // Returns true iff value is in the inclusive interval [min..max] 1627 // false, otherwise. 1628 if (val >= min && val <= max) { 1629 return true; 1630 } 1631 jio_fprintf(defaultStream::error_stream(), 1632 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1633 " and " UINTX_FORMAT "\n", 1634 name, val, min, max); 1635 return false; 1636 } 1637 1638 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1639 // Returns true if given value is greater than specified min threshold 1640 // false, otherwise. 1641 if (val >= min ) { 1642 return true; 1643 } 1644 jio_fprintf(defaultStream::error_stream(), 1645 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n", 1646 name, val, min); 1647 return false; 1648 } 1649 1650 bool Arguments::verify_percentage(uintx value, const char* name) { 1651 if (value <= 100) { 1652 return true; 1653 } 1654 jio_fprintf(defaultStream::error_stream(), 1655 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1656 name, value); 1657 return false; 1658 } 1659 1660 static void force_serial_gc() { 1661 FLAG_SET_DEFAULT(UseSerialGC, true); 1662 FLAG_SET_DEFAULT(UseParNewGC, false); 1663 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1664 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1665 FLAG_SET_DEFAULT(UseParallelGC, false); 1666 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1667 FLAG_SET_DEFAULT(UseG1GC, false); 1668 } 1669 1670 static bool verify_serial_gc_flags() { 1671 return (UseSerialGC && 1672 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1673 UseParallelGC || UseParallelOldGC)); 1674 } 1675 1676 // Check consistency of GC selection 1677 bool Arguments::check_gc_consistency() { 1678 bool status = true; 1679 // Ensure that the user has not selected conflicting sets 1680 // of collectors. [Note: this check is merely a user convenience; 1681 // collectors over-ride each other so that only a non-conflicting 1682 // set is selected; however what the user gets is not what they 1683 // may have expected from the combination they asked for. It's 1684 // better to reduce user confusion by not allowing them to 1685 // select conflicting combinations. 1686 uint i = 0; 1687 if (UseSerialGC) i++; 1688 if (UseConcMarkSweepGC || UseParNewGC) i++; 1689 if (UseParallelGC || UseParallelOldGC) i++; 1690 if (UseG1GC) i++; 1691 if (i > 1) { 1692 jio_fprintf(defaultStream::error_stream(), 1693 "Conflicting collector combinations in option list; " 1694 "please refer to the release notes for the combinations " 1695 "allowed\n"); 1696 status = false; 1697 } 1698 1699 return status; 1700 } 1701 1702 // Check stack pages settings 1703 bool Arguments::check_stack_pages() 1704 { 1705 bool status = true; 1706 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1707 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1708 // greater stack shadow pages can't generate instruction to bang stack 1709 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1710 return status; 1711 } 1712 1713 // Check the consistency of vm_init_args 1714 bool Arguments::check_vm_args_consistency() { 1715 // Method for adding checks for flag consistency. 1716 // The intent is to warn the user of all possible conflicts, 1717 // before returning an error. 1718 // Note: Needs platform-dependent factoring. 1719 bool status = true; 1720 1721 #if ( (defined(COMPILER2) && defined(SPARC))) 1722 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1723 // on sparc doesn't require generation of a stub as is the case on, e.g., 1724 // x86. Normally, VM_Version_init must be called from init_globals in 1725 // init.cpp, which is called by the initial java thread *after* arguments 1726 // have been parsed. VM_Version_init gets called twice on sparc. 1727 extern void VM_Version_init(); 1728 VM_Version_init(); 1729 if (!VM_Version::has_v9()) { 1730 jio_fprintf(defaultStream::error_stream(), 1731 "V8 Machine detected, Server requires V9\n"); 1732 status = false; 1733 } 1734 #endif /* COMPILER2 && SPARC */ 1735 1736 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1737 // builds so the cost of stack banging can be measured. 1738 #if (defined(PRODUCT) && defined(SOLARIS)) 1739 if (!UseBoundThreads && !UseStackBanging) { 1740 jio_fprintf(defaultStream::error_stream(), 1741 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1742 1743 status = false; 1744 } 1745 #endif 1746 1747 if (TLABRefillWasteFraction == 0) { 1748 jio_fprintf(defaultStream::error_stream(), 1749 "TLABRefillWasteFraction should be a denominator, " 1750 "not " SIZE_FORMAT "\n", 1751 TLABRefillWasteFraction); 1752 status = false; 1753 } 1754 1755 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1756 "AdaptiveSizePolicyWeight"); 1757 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1758 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1759 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1760 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1761 1762 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1763 jio_fprintf(defaultStream::error_stream(), 1764 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1765 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1766 MinHeapFreeRatio, MaxHeapFreeRatio); 1767 status = false; 1768 } 1769 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1770 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1771 1772 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1773 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1774 } 1775 1776 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1777 // Settings to encourage splitting. 1778 if (!FLAG_IS_CMDLINE(NewRatio)) { 1779 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1780 } 1781 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1782 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1783 } 1784 } 1785 1786 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1787 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1788 if (GCTimeLimit == 100) { 1789 // Turn off gc-overhead-limit-exceeded checks 1790 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1791 } 1792 1793 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1794 1795 // Check whether user-specified sharing option conflicts with GC or page size. 1796 // Both sharing and large pages are enabled by default on some platforms; 1797 // large pages override sharing only if explicitly set on the command line. 1798 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode || 1799 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC || 1800 UseLargePages && FLAG_IS_CMDLINE(UseLargePages); 1801 if (cannot_share) { 1802 // Either force sharing on by forcing the other options off, or 1803 // force sharing off. 1804 if (DumpSharedSpaces || ForceSharedSpaces) { 1805 jio_fprintf(defaultStream::error_stream(), 1806 "Using Serial GC and default page size because of %s\n", 1807 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump"); 1808 force_serial_gc(); 1809 FLAG_SET_DEFAULT(UseLargePages, false); 1810 } else { 1811 if (UseSharedSpaces && Verbose) { 1812 jio_fprintf(defaultStream::error_stream(), 1813 "Turning off use of shared archive because of " 1814 "choice of garbage collector or large pages\n"); 1815 } 1816 no_shared_spaces(); 1817 } 1818 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) { 1819 FLAG_SET_DEFAULT(UseLargePages, false); 1820 } 1821 1822 status = status && check_gc_consistency(); 1823 status = status && check_stack_pages(); 1824 1825 if (_has_alloc_profile) { 1826 if (UseParallelGC || UseParallelOldGC) { 1827 jio_fprintf(defaultStream::error_stream(), 1828 "error: invalid argument combination.\n" 1829 "Allocation profiling (-Xaprof) cannot be used together with " 1830 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1831 status = false; 1832 } 1833 if (UseConcMarkSweepGC) { 1834 jio_fprintf(defaultStream::error_stream(), 1835 "error: invalid argument combination.\n" 1836 "Allocation profiling (-Xaprof) cannot be used together with " 1837 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1838 status = false; 1839 } 1840 } 1841 1842 if (CMSIncrementalMode) { 1843 if (!UseConcMarkSweepGC) { 1844 jio_fprintf(defaultStream::error_stream(), 1845 "error: invalid argument combination.\n" 1846 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1847 "selected in order\nto use CMSIncrementalMode.\n"); 1848 status = false; 1849 } else { 1850 status = status && verify_percentage(CMSIncrementalDutyCycle, 1851 "CMSIncrementalDutyCycle"); 1852 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1853 "CMSIncrementalDutyCycleMin"); 1854 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1855 "CMSIncrementalSafetyFactor"); 1856 status = status && verify_percentage(CMSIncrementalOffset, 1857 "CMSIncrementalOffset"); 1858 status = status && verify_percentage(CMSExpAvgFactor, 1859 "CMSExpAvgFactor"); 1860 // If it was not set on the command line, set 1861 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1862 if (CMSInitiatingOccupancyFraction < 0) { 1863 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1864 } 1865 } 1866 } 1867 1868 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1869 // insists that we hold the requisite locks so that the iteration is 1870 // MT-safe. For the verification at start-up and shut-down, we don't 1871 // yet have a good way of acquiring and releasing these locks, 1872 // which are not visible at the CollectedHeap level. We want to 1873 // be able to acquire these locks and then do the iteration rather 1874 // than just disable the lock verification. This will be fixed under 1875 // bug 4788986. 1876 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1877 if (VerifyGCStartAt == 0) { 1878 warning("Heap verification at start-up disabled " 1879 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1880 VerifyGCStartAt = 1; // Disable verification at start-up 1881 } 1882 if (VerifyBeforeExit) { 1883 warning("Heap verification at shutdown disabled " 1884 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1885 VerifyBeforeExit = false; // Disable verification at shutdown 1886 } 1887 } 1888 1889 // Note: only executed in non-PRODUCT mode 1890 if (!UseAsyncConcMarkSweepGC && 1891 (ExplicitGCInvokesConcurrent || 1892 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1893 jio_fprintf(defaultStream::error_stream(), 1894 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1895 " with -UseAsyncConcMarkSweepGC"); 1896 status = false; 1897 } 1898 1899 if (UseG1GC) { 1900 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1901 "InitiatingHeapOccupancyPercent"); 1902 } 1903 1904 status = status && verify_interval(RefDiscoveryPolicy, 1905 ReferenceProcessor::DiscoveryPolicyMin, 1906 ReferenceProcessor::DiscoveryPolicyMax, 1907 "RefDiscoveryPolicy"); 1908 1909 // Limit the lower bound of this flag to 1 as it is used in a division 1910 // expression. 1911 status = status && verify_interval(TLABWasteTargetPercent, 1912 1, 100, "TLABWasteTargetPercent"); 1913 1914 status = status && verify_object_alignment(); 1915 1916 return status; 1917 } 1918 1919 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1920 const char* option_type) { 1921 if (ignore) return false; 1922 1923 const char* spacer = " "; 1924 if (option_type == NULL) { 1925 option_type = ++spacer; // Set both to the empty string. 1926 } 1927 1928 if (os::obsolete_option(option)) { 1929 jio_fprintf(defaultStream::error_stream(), 1930 "Obsolete %s%soption: %s\n", option_type, spacer, 1931 option->optionString); 1932 return false; 1933 } else { 1934 jio_fprintf(defaultStream::error_stream(), 1935 "Unrecognized %s%soption: %s\n", option_type, spacer, 1936 option->optionString); 1937 return true; 1938 } 1939 } 1940 1941 static const char* user_assertion_options[] = { 1942 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1943 }; 1944 1945 static const char* system_assertion_options[] = { 1946 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1947 }; 1948 1949 // Return true if any of the strings in null-terminated array 'names' matches. 1950 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 1951 // the option must match exactly. 1952 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 1953 bool tail_allowed) { 1954 for (/* empty */; *names != NULL; ++names) { 1955 if (match_option(option, *names, tail)) { 1956 if (**tail == '\0' || tail_allowed && **tail == ':') { 1957 return true; 1958 } 1959 } 1960 } 1961 return false; 1962 } 1963 1964 bool Arguments::parse_uintx(const char* value, 1965 uintx* uintx_arg, 1966 uintx min_size) { 1967 1968 // Check the sign first since atomull() parses only unsigned values. 1969 bool value_is_positive = !(*value == '-'); 1970 1971 if (value_is_positive) { 1972 julong n; 1973 bool good_return = atomull(value, &n); 1974 if (good_return) { 1975 bool above_minimum = n >= min_size; 1976 bool value_is_too_large = n > max_uintx; 1977 1978 if (above_minimum && !value_is_too_large) { 1979 *uintx_arg = n; 1980 return true; 1981 } 1982 } 1983 } 1984 return false; 1985 } 1986 1987 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1988 julong* long_arg, 1989 julong min_size) { 1990 if (!atomull(s, long_arg)) return arg_unreadable; 1991 return check_memory_size(*long_arg, min_size); 1992 } 1993 1994 // Parse JavaVMInitArgs structure 1995 1996 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 1997 // For components of the system classpath. 1998 SysClassPath scp(Arguments::get_sysclasspath()); 1999 bool scp_assembly_required = false; 2000 2001 // Save default settings for some mode flags 2002 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2003 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2004 Arguments::_ClipInlining = ClipInlining; 2005 Arguments::_BackgroundCompilation = BackgroundCompilation; 2006 2007 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2008 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2009 if (result != JNI_OK) { 2010 return result; 2011 } 2012 2013 // Parse JavaVMInitArgs structure passed in 2014 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2015 if (result != JNI_OK) { 2016 return result; 2017 } 2018 2019 if (AggressiveOpts) { 2020 // Insert alt-rt.jar between user-specified bootclasspath 2021 // prefix and the default bootclasspath. os::set_boot_path() 2022 // uses meta_index_dir as the default bootclasspath directory. 2023 const char* altclasses_jar = "alt-rt.jar"; 2024 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2025 strlen(altclasses_jar); 2026 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 2027 strcpy(altclasses_path, get_meta_index_dir()); 2028 strcat(altclasses_path, altclasses_jar); 2029 scp.add_suffix_to_prefix(altclasses_path); 2030 scp_assembly_required = true; 2031 FREE_C_HEAP_ARRAY(char, altclasses_path); 2032 } 2033 2034 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2035 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2036 if (result != JNI_OK) { 2037 return result; 2038 } 2039 2040 // Do final processing now that all arguments have been parsed 2041 result = finalize_vm_init_args(&scp, scp_assembly_required); 2042 if (result != JNI_OK) { 2043 return result; 2044 } 2045 2046 return JNI_OK; 2047 } 2048 2049 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2050 SysClassPath* scp_p, 2051 bool* scp_assembly_required_p, 2052 FlagValueOrigin origin) { 2053 // Remaining part of option string 2054 const char* tail; 2055 2056 // iterate over arguments 2057 for (int index = 0; index < args->nOptions; index++) { 2058 bool is_absolute_path = false; // for -agentpath vs -agentlib 2059 2060 const JavaVMOption* option = args->options + index; 2061 2062 if (!match_option(option, "-Djava.class.path", &tail) && 2063 !match_option(option, "-Dsun.java.command", &tail) && 2064 !match_option(option, "-Dsun.java.launcher", &tail)) { 2065 2066 // add all jvm options to the jvm_args string. This string 2067 // is used later to set the java.vm.args PerfData string constant. 2068 // the -Djava.class.path and the -Dsun.java.command options are 2069 // omitted from jvm_args string as each have their own PerfData 2070 // string constant object. 2071 build_jvm_args(option->optionString); 2072 } 2073 2074 // -verbose:[class/gc/jni] 2075 if (match_option(option, "-verbose", &tail)) { 2076 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2077 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2078 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2079 } else if (!strcmp(tail, ":gc")) { 2080 FLAG_SET_CMDLINE(bool, PrintGC, true); 2081 } else if (!strcmp(tail, ":jni")) { 2082 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2083 } 2084 // -da / -ea / -disableassertions / -enableassertions 2085 // These accept an optional class/package name separated by a colon, e.g., 2086 // -da:java.lang.Thread. 2087 } else if (match_option(option, user_assertion_options, &tail, true)) { 2088 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2089 if (*tail == '\0') { 2090 JavaAssertions::setUserClassDefault(enable); 2091 } else { 2092 assert(*tail == ':', "bogus match by match_option()"); 2093 JavaAssertions::addOption(tail + 1, enable); 2094 } 2095 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2096 } else if (match_option(option, system_assertion_options, &tail, false)) { 2097 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2098 JavaAssertions::setSystemClassDefault(enable); 2099 // -bootclasspath: 2100 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2101 scp_p->reset_path(tail); 2102 *scp_assembly_required_p = true; 2103 // -bootclasspath/a: 2104 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2105 scp_p->add_suffix(tail); 2106 *scp_assembly_required_p = true; 2107 // -bootclasspath/p: 2108 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2109 scp_p->add_prefix(tail); 2110 *scp_assembly_required_p = true; 2111 // -Xrun 2112 } else if (match_option(option, "-Xrun", &tail)) { 2113 if (tail != NULL) { 2114 const char* pos = strchr(tail, ':'); 2115 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2116 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2117 name[len] = '\0'; 2118 2119 char *options = NULL; 2120 if(pos != NULL) { 2121 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2122 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 2123 } 2124 #ifdef JVMTI_KERNEL 2125 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2126 warning("profiling and debugging agents are not supported with Kernel VM"); 2127 } else 2128 #endif // JVMTI_KERNEL 2129 add_init_library(name, options); 2130 } 2131 // -agentlib and -agentpath 2132 } else if (match_option(option, "-agentlib:", &tail) || 2133 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2134 if(tail != NULL) { 2135 const char* pos = strchr(tail, '='); 2136 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2137 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2138 name[len] = '\0'; 2139 2140 char *options = NULL; 2141 if(pos != NULL) { 2142 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 2143 } 2144 #ifdef JVMTI_KERNEL 2145 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2146 warning("profiling and debugging agents are not supported with Kernel VM"); 2147 } else 2148 #endif // JVMTI_KERNEL 2149 add_init_agent(name, options, is_absolute_path); 2150 2151 } 2152 // -javaagent 2153 } else if (match_option(option, "-javaagent:", &tail)) { 2154 if(tail != NULL) { 2155 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 2156 add_init_agent("instrument", options, false); 2157 } 2158 // -Xnoclassgc 2159 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2160 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2161 // -Xincgc: i-CMS 2162 } else if (match_option(option, "-Xincgc", &tail)) { 2163 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2164 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2165 // -Xnoincgc: no i-CMS 2166 } else if (match_option(option, "-Xnoincgc", &tail)) { 2167 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2168 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2169 // -Xconcgc 2170 } else if (match_option(option, "-Xconcgc", &tail)) { 2171 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2172 // -Xnoconcgc 2173 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2174 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2175 // -Xbatch 2176 } else if (match_option(option, "-Xbatch", &tail)) { 2177 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2178 // -Xmn for compatibility with other JVM vendors 2179 } else if (match_option(option, "-Xmn", &tail)) { 2180 julong long_initial_eden_size = 0; 2181 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2182 if (errcode != arg_in_range) { 2183 jio_fprintf(defaultStream::error_stream(), 2184 "Invalid initial eden size: %s\n", option->optionString); 2185 describe_range_error(errcode); 2186 return JNI_EINVAL; 2187 } 2188 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2189 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2190 // -Xms 2191 } else if (match_option(option, "-Xms", &tail)) { 2192 julong long_initial_heap_size = 0; 2193 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2194 if (errcode != arg_in_range) { 2195 jio_fprintf(defaultStream::error_stream(), 2196 "Invalid initial heap size: %s\n", option->optionString); 2197 describe_range_error(errcode); 2198 return JNI_EINVAL; 2199 } 2200 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2201 // Currently the minimum size and the initial heap sizes are the same. 2202 set_min_heap_size(InitialHeapSize); 2203 // -Xmx 2204 } else if (match_option(option, "-Xmx", &tail)) { 2205 julong long_max_heap_size = 0; 2206 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2207 if (errcode != arg_in_range) { 2208 jio_fprintf(defaultStream::error_stream(), 2209 "Invalid maximum heap size: %s\n", option->optionString); 2210 describe_range_error(errcode); 2211 return JNI_EINVAL; 2212 } 2213 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2214 // Xmaxf 2215 } else if (match_option(option, "-Xmaxf", &tail)) { 2216 int maxf = (int)(atof(tail) * 100); 2217 if (maxf < 0 || maxf > 100) { 2218 jio_fprintf(defaultStream::error_stream(), 2219 "Bad max heap free percentage size: %s\n", 2220 option->optionString); 2221 return JNI_EINVAL; 2222 } else { 2223 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2224 } 2225 // Xminf 2226 } else if (match_option(option, "-Xminf", &tail)) { 2227 int minf = (int)(atof(tail) * 100); 2228 if (minf < 0 || minf > 100) { 2229 jio_fprintf(defaultStream::error_stream(), 2230 "Bad min heap free percentage size: %s\n", 2231 option->optionString); 2232 return JNI_EINVAL; 2233 } else { 2234 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2235 } 2236 // -Xss 2237 } else if (match_option(option, "-Xss", &tail)) { 2238 julong long_ThreadStackSize = 0; 2239 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2240 if (errcode != arg_in_range) { 2241 jio_fprintf(defaultStream::error_stream(), 2242 "Invalid thread stack size: %s\n", option->optionString); 2243 describe_range_error(errcode); 2244 return JNI_EINVAL; 2245 } 2246 // Internally track ThreadStackSize in units of 1024 bytes. 2247 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2248 round_to((int)long_ThreadStackSize, K) / K); 2249 // -Xoss 2250 } else if (match_option(option, "-Xoss", &tail)) { 2251 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2252 // -Xmaxjitcodesize 2253 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) { 2254 julong long_ReservedCodeCacheSize = 0; 2255 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2256 (size_t)InitialCodeCacheSize); 2257 if (errcode != arg_in_range) { 2258 jio_fprintf(defaultStream::error_stream(), 2259 "Invalid maximum code cache size: %s\n", 2260 option->optionString); 2261 describe_range_error(errcode); 2262 return JNI_EINVAL; 2263 } 2264 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2265 // -green 2266 } else if (match_option(option, "-green", &tail)) { 2267 jio_fprintf(defaultStream::error_stream(), 2268 "Green threads support not available\n"); 2269 return JNI_EINVAL; 2270 // -native 2271 } else if (match_option(option, "-native", &tail)) { 2272 // HotSpot always uses native threads, ignore silently for compatibility 2273 // -Xsqnopause 2274 } else if (match_option(option, "-Xsqnopause", &tail)) { 2275 // EVM option, ignore silently for compatibility 2276 // -Xrs 2277 } else if (match_option(option, "-Xrs", &tail)) { 2278 // Classic/EVM option, new functionality 2279 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2280 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2281 // change default internal VM signals used - lower case for back compat 2282 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2283 // -Xoptimize 2284 } else if (match_option(option, "-Xoptimize", &tail)) { 2285 // EVM option, ignore silently for compatibility 2286 // -Xprof 2287 } else if (match_option(option, "-Xprof", &tail)) { 2288 #ifndef FPROF_KERNEL 2289 _has_profile = true; 2290 #else // FPROF_KERNEL 2291 // do we have to exit? 2292 warning("Kernel VM does not support flat profiling."); 2293 #endif // FPROF_KERNEL 2294 // -Xaprof 2295 } else if (match_option(option, "-Xaprof", &tail)) { 2296 _has_alloc_profile = true; 2297 // -Xconcurrentio 2298 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2299 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2300 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2301 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2302 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2303 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2304 2305 // -Xinternalversion 2306 } else if (match_option(option, "-Xinternalversion", &tail)) { 2307 jio_fprintf(defaultStream::output_stream(), "%s\n", 2308 VM_Version::internal_vm_info_string()); 2309 vm_exit(0); 2310 #ifndef PRODUCT 2311 // -Xprintflags 2312 } else if (match_option(option, "-Xprintflags", &tail)) { 2313 CommandLineFlags::printFlags(); 2314 vm_exit(0); 2315 #endif 2316 // -D 2317 } else if (match_option(option, "-D", &tail)) { 2318 if (!add_property(tail)) { 2319 return JNI_ENOMEM; 2320 } 2321 // Out of the box management support 2322 if (match_option(option, "-Dcom.sun.management", &tail)) { 2323 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2324 } 2325 // -Xint 2326 } else if (match_option(option, "-Xint", &tail)) { 2327 set_mode_flags(_int); 2328 // -Xmixed 2329 } else if (match_option(option, "-Xmixed", &tail)) { 2330 set_mode_flags(_mixed); 2331 // -Xcomp 2332 } else if (match_option(option, "-Xcomp", &tail)) { 2333 // for testing the compiler; turn off all flags that inhibit compilation 2334 set_mode_flags(_comp); 2335 2336 // -Xshare:dump 2337 } else if (match_option(option, "-Xshare:dump", &tail)) { 2338 #ifdef TIERED 2339 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2340 set_mode_flags(_int); // Prevent compilation, which creates objects 2341 #elif defined(COMPILER2) 2342 vm_exit_during_initialization( 2343 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2344 #elif defined(KERNEL) 2345 vm_exit_during_initialization( 2346 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2347 #else 2348 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2349 set_mode_flags(_int); // Prevent compilation, which creates objects 2350 #endif 2351 // -Xshare:on 2352 } else if (match_option(option, "-Xshare:on", &tail)) { 2353 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2354 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2355 #ifdef TIERED 2356 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true); 2357 #endif // TIERED 2358 // -Xshare:auto 2359 } else if (match_option(option, "-Xshare:auto", &tail)) { 2360 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2361 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2362 // -Xshare:off 2363 } else if (match_option(option, "-Xshare:off", &tail)) { 2364 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2365 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2366 2367 // -Xverify 2368 } else if (match_option(option, "-Xverify", &tail)) { 2369 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2370 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2371 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2372 } else if (strcmp(tail, ":remote") == 0) { 2373 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2374 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2375 } else if (strcmp(tail, ":none") == 0) { 2376 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2377 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2378 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2379 return JNI_EINVAL; 2380 } 2381 // -Xdebug 2382 } else if (match_option(option, "-Xdebug", &tail)) { 2383 // note this flag has been used, then ignore 2384 set_xdebug_mode(true); 2385 // -Xnoagent 2386 } else if (match_option(option, "-Xnoagent", &tail)) { 2387 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2388 } else if (match_option(option, "-Xboundthreads", &tail)) { 2389 // Bind user level threads to kernel threads (Solaris only) 2390 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2391 } else if (match_option(option, "-Xloggc:", &tail)) { 2392 // Redirect GC output to the file. -Xloggc:<filename> 2393 // ostream_init_log(), when called will use this filename 2394 // to initialize a fileStream. 2395 _gc_log_filename = strdup(tail); 2396 FLAG_SET_CMDLINE(bool, PrintGC, true); 2397 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2398 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2399 2400 // JNI hooks 2401 } else if (match_option(option, "-Xcheck", &tail)) { 2402 if (!strcmp(tail, ":jni")) { 2403 CheckJNICalls = true; 2404 } else if (is_bad_option(option, args->ignoreUnrecognized, 2405 "check")) { 2406 return JNI_EINVAL; 2407 } 2408 } else if (match_option(option, "vfprintf", &tail)) { 2409 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2410 } else if (match_option(option, "exit", &tail)) { 2411 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2412 } else if (match_option(option, "abort", &tail)) { 2413 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2414 // -XX:+AggressiveHeap 2415 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2416 2417 // This option inspects the machine and attempts to set various 2418 // parameters to be optimal for long-running, memory allocation 2419 // intensive jobs. It is intended for machines with large 2420 // amounts of cpu and memory. 2421 2422 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2423 // VM, but we may not be able to represent the total physical memory 2424 // available (like having 8gb of memory on a box but using a 32bit VM). 2425 // Thus, we need to make sure we're using a julong for intermediate 2426 // calculations. 2427 julong initHeapSize; 2428 julong total_memory = os::physical_memory(); 2429 2430 if (total_memory < (julong)256*M) { 2431 jio_fprintf(defaultStream::error_stream(), 2432 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2433 vm_exit(1); 2434 } 2435 2436 // The heap size is half of available memory, or (at most) 2437 // all of possible memory less 160mb (leaving room for the OS 2438 // when using ISM). This is the maximum; because adaptive sizing 2439 // is turned on below, the actual space used may be smaller. 2440 2441 initHeapSize = MIN2(total_memory / (julong)2, 2442 total_memory - (julong)160*M); 2443 2444 // Make sure that if we have a lot of memory we cap the 32 bit 2445 // process space. The 64bit VM version of this function is a nop. 2446 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2447 2448 // The perm gen is separate but contiguous with the 2449 // object heap (and is reserved with it) so subtract it 2450 // from the heap size. 2451 if (initHeapSize > MaxPermSize) { 2452 initHeapSize = initHeapSize - MaxPermSize; 2453 } else { 2454 warning("AggressiveHeap and MaxPermSize values may conflict"); 2455 } 2456 2457 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2458 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2459 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2460 // Currently the minimum size and the initial heap sizes are the same. 2461 set_min_heap_size(initHeapSize); 2462 } 2463 if (FLAG_IS_DEFAULT(NewSize)) { 2464 // Make the young generation 3/8ths of the total heap. 2465 FLAG_SET_CMDLINE(uintx, NewSize, 2466 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2467 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2468 } 2469 2470 FLAG_SET_DEFAULT(UseLargePages, true); 2471 2472 // Increase some data structure sizes for efficiency 2473 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2474 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2475 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2476 2477 // See the OldPLABSize comment below, but replace 'after promotion' 2478 // with 'after copying'. YoungPLABSize is the size of the survivor 2479 // space per-gc-thread buffers. The default is 4kw. 2480 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2481 2482 // OldPLABSize is the size of the buffers in the old gen that 2483 // UseParallelGC uses to promote live data that doesn't fit in the 2484 // survivor spaces. At any given time, there's one for each gc thread. 2485 // The default size is 1kw. These buffers are rarely used, since the 2486 // survivor spaces are usually big enough. For specjbb, however, there 2487 // are occasions when there's lots of live data in the young gen 2488 // and we end up promoting some of it. We don't have a definite 2489 // explanation for why bumping OldPLABSize helps, but the theory 2490 // is that a bigger PLAB results in retaining something like the 2491 // original allocation order after promotion, which improves mutator 2492 // locality. A minor effect may be that larger PLABs reduce the 2493 // number of PLAB allocation events during gc. The value of 8kw 2494 // was arrived at by experimenting with specjbb. 2495 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2496 2497 // CompilationPolicyChoice=0 causes the server compiler to adopt 2498 // a more conservative which-method-do-I-compile policy when one 2499 // of the counters maintained by the interpreter trips. The 2500 // result is reduced startup time and improved specjbb and 2501 // alacrity performance. Zero is the default, but we set it 2502 // explicitly here in case the default changes. 2503 // See runtime/compilationPolicy.*. 2504 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2505 2506 // Enable parallel GC and adaptive generation sizing 2507 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2508 FLAG_SET_DEFAULT(ParallelGCThreads, 2509 Abstract_VM_Version::parallel_worker_threads()); 2510 2511 // Encourage steady state memory management 2512 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2513 2514 // This appears to improve mutator locality 2515 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2516 2517 // Get around early Solaris scheduling bug 2518 // (affinity vs other jobs on system) 2519 // but disallow DR and offlining (5008695). 2520 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2521 2522 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2523 // The last option must always win. 2524 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2525 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2526 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2527 // The last option must always win. 2528 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2529 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2530 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2531 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2532 jio_fprintf(defaultStream::error_stream(), 2533 "Please use CMSClassUnloadingEnabled in place of " 2534 "CMSPermGenSweepingEnabled in the future\n"); 2535 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2536 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2537 jio_fprintf(defaultStream::error_stream(), 2538 "Please use -XX:+UseGCOverheadLimit in place of " 2539 "-XX:+UseGCTimeLimit in the future\n"); 2540 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2541 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2542 jio_fprintf(defaultStream::error_stream(), 2543 "Please use -XX:-UseGCOverheadLimit in place of " 2544 "-XX:-UseGCTimeLimit in the future\n"); 2545 // The TLE options are for compatibility with 1.3 and will be 2546 // removed without notice in a future release. These options 2547 // are not to be documented. 2548 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2549 // No longer used. 2550 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2551 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2552 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2553 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2554 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2555 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2556 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2557 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2558 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2559 // No longer used. 2560 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2561 julong long_tlab_size = 0; 2562 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2563 if (errcode != arg_in_range) { 2564 jio_fprintf(defaultStream::error_stream(), 2565 "Invalid TLAB size: %s\n", option->optionString); 2566 describe_range_error(errcode); 2567 return JNI_EINVAL; 2568 } 2569 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2570 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2571 // No longer used. 2572 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2573 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2574 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2575 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2576 SOLARIS_ONLY( 2577 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2578 warning("-XX:+UsePermISM is obsolete."); 2579 FLAG_SET_CMDLINE(bool, UseISM, true); 2580 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2581 FLAG_SET_CMDLINE(bool, UseISM, false); 2582 ) 2583 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2584 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2585 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2586 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2587 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2588 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2589 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2590 #ifdef SOLARIS 2591 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2592 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2593 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2594 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2595 #else // ndef SOLARIS 2596 jio_fprintf(defaultStream::error_stream(), 2597 "ExtendedDTraceProbes flag is only applicable on Solaris\n"); 2598 return JNI_EINVAL; 2599 #endif // ndef SOLARIS 2600 #ifdef ASSERT 2601 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2602 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2603 // disable scavenge before parallel mark-compact 2604 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2605 #endif 2606 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2607 julong cms_blocks_to_claim = (julong)atol(tail); 2608 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2609 jio_fprintf(defaultStream::error_stream(), 2610 "Please use -XX:OldPLABSize in place of " 2611 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2612 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2613 julong cms_blocks_to_claim = (julong)atol(tail); 2614 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2615 jio_fprintf(defaultStream::error_stream(), 2616 "Please use -XX:OldPLABSize in place of " 2617 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2618 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2619 julong old_plab_size = 0; 2620 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2621 if (errcode != arg_in_range) { 2622 jio_fprintf(defaultStream::error_stream(), 2623 "Invalid old PLAB size: %s\n", option->optionString); 2624 describe_range_error(errcode); 2625 return JNI_EINVAL; 2626 } 2627 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2628 jio_fprintf(defaultStream::error_stream(), 2629 "Please use -XX:OldPLABSize in place of " 2630 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2631 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2632 julong young_plab_size = 0; 2633 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2634 if (errcode != arg_in_range) { 2635 jio_fprintf(defaultStream::error_stream(), 2636 "Invalid young PLAB size: %s\n", option->optionString); 2637 describe_range_error(errcode); 2638 return JNI_EINVAL; 2639 } 2640 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2641 jio_fprintf(defaultStream::error_stream(), 2642 "Please use -XX:YoungPLABSize in place of " 2643 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2644 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2645 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2646 julong stack_size = 0; 2647 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2648 if (errcode != arg_in_range) { 2649 jio_fprintf(defaultStream::error_stream(), 2650 "Invalid mark stack size: %s\n", option->optionString); 2651 describe_range_error(errcode); 2652 return JNI_EINVAL; 2653 } 2654 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2655 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2656 julong max_stack_size = 0; 2657 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2658 if (errcode != arg_in_range) { 2659 jio_fprintf(defaultStream::error_stream(), 2660 "Invalid maximum mark stack size: %s\n", 2661 option->optionString); 2662 describe_range_error(errcode); 2663 return JNI_EINVAL; 2664 } 2665 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2666 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2667 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2668 uintx conc_threads = 0; 2669 if (!parse_uintx(tail, &conc_threads, 1)) { 2670 jio_fprintf(defaultStream::error_stream(), 2671 "Invalid concurrent threads: %s\n", option->optionString); 2672 return JNI_EINVAL; 2673 } 2674 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2675 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2676 // Skip -XX:Flags= since that case has already been handled 2677 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2678 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2679 return JNI_EINVAL; 2680 } 2681 } 2682 // Unknown option 2683 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2684 return JNI_ERR; 2685 } 2686 } 2687 // Change the default value for flags which have different default values 2688 // when working with older JDKs. 2689 if (JDK_Version::current().compare_major(6) <= 0 && 2690 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2691 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2692 } 2693 #ifdef LINUX 2694 if (JDK_Version::current().compare_major(6) <= 0 && 2695 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2696 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2697 } 2698 #endif // LINUX 2699 return JNI_OK; 2700 } 2701 2702 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2703 // This must be done after all -D arguments have been processed. 2704 scp_p->expand_endorsed(); 2705 2706 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2707 // Assemble the bootclasspath elements into the final path. 2708 Arguments::set_sysclasspath(scp_p->combined_path()); 2709 } 2710 2711 // This must be done after all arguments have been processed. 2712 // java_compiler() true means set to "NONE" or empty. 2713 if (java_compiler() && !xdebug_mode()) { 2714 // For backwards compatibility, we switch to interpreted mode if 2715 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2716 // not specified. 2717 set_mode_flags(_int); 2718 } 2719 if (CompileThreshold == 0) { 2720 set_mode_flags(_int); 2721 } 2722 2723 #ifndef COMPILER2 2724 // Don't degrade server performance for footprint 2725 if (FLAG_IS_DEFAULT(UseLargePages) && 2726 MaxHeapSize < LargePageHeapSizeThreshold) { 2727 // No need for large granularity pages w/small heaps. 2728 // Note that large pages are enabled/disabled for both the 2729 // Java heap and the code cache. 2730 FLAG_SET_DEFAULT(UseLargePages, false); 2731 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2732 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2733 } 2734 2735 // Tiered compilation is undefined with C1. 2736 TieredCompilation = false; 2737 #else 2738 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2739 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2740 } 2741 // Temporary disable bulk zeroing reduction with G1. See CR 6627983. 2742 if (UseG1GC) { 2743 FLAG_SET_DEFAULT(ReduceBulkZeroing, false); 2744 } 2745 #endif 2746 2747 // If we are running in a headless jre, force java.awt.headless property 2748 // to be true unless the property has already been set. 2749 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2750 if (os::is_headless_jre()) { 2751 const char* headless = Arguments::get_property("java.awt.headless"); 2752 if (headless == NULL) { 2753 char envbuffer[128]; 2754 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2755 if (!add_property("java.awt.headless=true")) { 2756 return JNI_ENOMEM; 2757 } 2758 } else { 2759 char buffer[256]; 2760 strcpy(buffer, "java.awt.headless="); 2761 strcat(buffer, envbuffer); 2762 if (!add_property(buffer)) { 2763 return JNI_ENOMEM; 2764 } 2765 } 2766 } 2767 } 2768 2769 if (!check_vm_args_consistency()) { 2770 return JNI_ERR; 2771 } 2772 2773 return JNI_OK; 2774 } 2775 2776 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2777 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2778 scp_assembly_required_p); 2779 } 2780 2781 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2782 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2783 scp_assembly_required_p); 2784 } 2785 2786 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2787 const int N_MAX_OPTIONS = 64; 2788 const int OPTION_BUFFER_SIZE = 1024; 2789 char buffer[OPTION_BUFFER_SIZE]; 2790 2791 // The variable will be ignored if it exceeds the length of the buffer. 2792 // Don't check this variable if user has special privileges 2793 // (e.g. unix su command). 2794 if (os::getenv(name, buffer, sizeof(buffer)) && 2795 !os::have_special_privileges()) { 2796 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2797 jio_fprintf(defaultStream::error_stream(), 2798 "Picked up %s: %s\n", name, buffer); 2799 char* rd = buffer; // pointer to the input string (rd) 2800 int i; 2801 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2802 while (isspace(*rd)) rd++; // skip whitespace 2803 if (*rd == 0) break; // we re done when the input string is read completely 2804 2805 // The output, option string, overwrites the input string. 2806 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2807 // input string (rd). 2808 char* wrt = rd; 2809 2810 options[i++].optionString = wrt; // Fill in option 2811 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2812 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2813 int quote = *rd; // matching quote to look for 2814 rd++; // don't copy open quote 2815 while (*rd != quote) { // include everything (even spaces) up until quote 2816 if (*rd == 0) { // string termination means unmatched string 2817 jio_fprintf(defaultStream::error_stream(), 2818 "Unmatched quote in %s\n", name); 2819 return JNI_ERR; 2820 } 2821 *wrt++ = *rd++; // copy to option string 2822 } 2823 rd++; // don't copy close quote 2824 } else { 2825 *wrt++ = *rd++; // copy to option string 2826 } 2827 } 2828 // Need to check if we're done before writing a NULL, 2829 // because the write could be to the byte that rd is pointing to. 2830 if (*rd++ == 0) { 2831 *wrt = 0; 2832 break; 2833 } 2834 *wrt = 0; // Zero terminate option 2835 } 2836 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2837 JavaVMInitArgs vm_args; 2838 vm_args.version = JNI_VERSION_1_2; 2839 vm_args.options = options; 2840 vm_args.nOptions = i; 2841 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2842 2843 if (PrintVMOptions) { 2844 const char* tail; 2845 for (int i = 0; i < vm_args.nOptions; i++) { 2846 const JavaVMOption *option = vm_args.options + i; 2847 if (match_option(option, "-XX:", &tail)) { 2848 logOption(tail); 2849 } 2850 } 2851 } 2852 2853 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2854 } 2855 return JNI_OK; 2856 } 2857 2858 2859 // Parse entry point called from JNI_CreateJavaVM 2860 2861 jint Arguments::parse(const JavaVMInitArgs* args) { 2862 2863 // Sharing support 2864 // Construct the path to the archive 2865 char jvm_path[JVM_MAXPATHLEN]; 2866 os::jvm_path(jvm_path, sizeof(jvm_path)); 2867 #ifdef TIERED 2868 if (strstr(jvm_path, "client") != NULL) { 2869 force_client_mode = true; 2870 } 2871 #endif // TIERED 2872 char *end = strrchr(jvm_path, *os::file_separator()); 2873 if (end != NULL) *end = '\0'; 2874 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2875 strlen(os::file_separator()) + 20); 2876 if (shared_archive_path == NULL) return JNI_ENOMEM; 2877 strcpy(shared_archive_path, jvm_path); 2878 strcat(shared_archive_path, os::file_separator()); 2879 strcat(shared_archive_path, "classes"); 2880 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2881 strcat(shared_archive_path, ".jsa"); 2882 SharedArchivePath = shared_archive_path; 2883 2884 // Remaining part of option string 2885 const char* tail; 2886 2887 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2888 bool settings_file_specified = false; 2889 const char* flags_file; 2890 int index; 2891 for (index = 0; index < args->nOptions; index++) { 2892 const JavaVMOption *option = args->options + index; 2893 if (match_option(option, "-XX:Flags=", &tail)) { 2894 flags_file = tail; 2895 settings_file_specified = true; 2896 } 2897 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2898 PrintVMOptions = true; 2899 } 2900 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2901 PrintVMOptions = false; 2902 } 2903 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2904 IgnoreUnrecognizedVMOptions = true; 2905 } 2906 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2907 IgnoreUnrecognizedVMOptions = false; 2908 } 2909 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 2910 CommandLineFlags::printFlags(); 2911 vm_exit(0); 2912 } 2913 2914 #ifndef PRODUCT 2915 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 2916 CommandLineFlags::printFlags(true); 2917 vm_exit(0); 2918 } 2919 #endif 2920 } 2921 2922 if (IgnoreUnrecognizedVMOptions) { 2923 // uncast const to modify the flag args->ignoreUnrecognized 2924 *(jboolean*)(&args->ignoreUnrecognized) = true; 2925 } 2926 2927 // Parse specified settings file 2928 if (settings_file_specified) { 2929 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 2930 return JNI_EINVAL; 2931 } 2932 } 2933 2934 // Parse default .hotspotrc settings file 2935 if (!settings_file_specified) { 2936 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 2937 return JNI_EINVAL; 2938 } 2939 } 2940 2941 if (PrintVMOptions) { 2942 for (index = 0; index < args->nOptions; index++) { 2943 const JavaVMOption *option = args->options + index; 2944 if (match_option(option, "-XX:", &tail)) { 2945 logOption(tail); 2946 } 2947 } 2948 } 2949 2950 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 2951 jint result = parse_vm_init_args(args); 2952 if (result != JNI_OK) { 2953 return result; 2954 } 2955 2956 #ifndef PRODUCT 2957 if (TraceBytecodesAt != 0) { 2958 TraceBytecodes = true; 2959 } 2960 if (CountCompiledCalls) { 2961 if (UseCounterDecay) { 2962 warning("UseCounterDecay disabled because CountCalls is set"); 2963 UseCounterDecay = false; 2964 } 2965 } 2966 #endif // PRODUCT 2967 2968 if (EnableInvokeDynamic && !EnableMethodHandles) { 2969 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) { 2970 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true"); 2971 } 2972 EnableMethodHandles = true; 2973 } 2974 if (EnableMethodHandles && !AnonymousClasses) { 2975 if (!FLAG_IS_DEFAULT(AnonymousClasses)) { 2976 warning("forcing AnonymousClasses true because EnableMethodHandles is true"); 2977 } 2978 AnonymousClasses = true; 2979 } 2980 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) { 2981 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 2982 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true"); 2983 } 2984 ScavengeRootsInCode = 1; 2985 } 2986 #ifdef COMPILER2 2987 if (EnableInvokeDynamic && DoEscapeAnalysis) { 2988 // TODO: We need to find rules for invokedynamic and EA. For now, 2989 // simply disable EA by default. 2990 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2991 DoEscapeAnalysis = false; 2992 } 2993 } 2994 #endif 2995 2996 if (PrintGCDetails) { 2997 // Turn on -verbose:gc options as well 2998 PrintGC = true; 2999 } 3000 3001 // Set object alignment values. 3002 set_object_alignment(); 3003 3004 #ifdef SERIALGC 3005 force_serial_gc(); 3006 #endif // SERIALGC 3007 #ifdef KERNEL 3008 no_shared_spaces(); 3009 #endif // KERNEL 3010 3011 // Set flags based on ergonomics. 3012 set_ergonomics_flags(); 3013 3014 #ifdef _LP64 3015 if (UseCompressedOops) { 3016 check_compressed_oops_compat(); 3017 } 3018 #endif 3019 3020 // Check the GC selections again. 3021 if (!check_gc_consistency()) { 3022 return JNI_EINVAL; 3023 } 3024 3025 if (TieredCompilation) { 3026 set_tiered_flags(); 3027 } else { 3028 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3029 if (CompilationPolicyChoice >= 2) { 3030 vm_exit_during_initialization( 3031 "Incompatible compilation policy selected", NULL); 3032 } 3033 } 3034 3035 #ifndef KERNEL 3036 if (UseConcMarkSweepGC) { 3037 // Set flags for CMS and ParNew. Check UseConcMarkSweep first 3038 // to ensure that when both UseConcMarkSweepGC and UseParNewGC 3039 // are true, we don't call set_parnew_gc_flags() as well. 3040 set_cms_and_parnew_gc_flags(); 3041 } else { 3042 // Set heap size based on available physical memory 3043 set_heap_size(); 3044 // Set per-collector flags 3045 if (UseParallelGC || UseParallelOldGC) { 3046 set_parallel_gc_flags(); 3047 } else if (UseParNewGC) { 3048 set_parnew_gc_flags(); 3049 } else if (UseG1GC) { 3050 set_g1_gc_flags(); 3051 } 3052 } 3053 #endif // KERNEL 3054 3055 #ifdef SERIALGC 3056 assert(verify_serial_gc_flags(), "SerialGC unset"); 3057 #endif // SERIALGC 3058 3059 // Set bytecode rewriting flags 3060 set_bytecode_flags(); 3061 3062 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3063 set_aggressive_opts_flags(); 3064 3065 #ifdef CC_INTERP 3066 // Clear flags not supported by the C++ interpreter 3067 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3068 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3069 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3070 #endif // CC_INTERP 3071 3072 #ifdef COMPILER2 3073 if (!UseBiasedLocking || EmitSync != 0) { 3074 UseOptoBiasInlining = false; 3075 } 3076 #endif 3077 3078 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3079 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3080 DebugNonSafepoints = true; 3081 } 3082 3083 #ifndef PRODUCT 3084 if (CompileTheWorld) { 3085 // Force NmethodSweeper to sweep whole CodeCache each time. 3086 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3087 NmethodSweepFraction = 1; 3088 } 3089 } 3090 #endif 3091 3092 if (PrintCommandLineFlags) { 3093 CommandLineFlags::printSetFlags(); 3094 } 3095 3096 // Apply CPU specific policy for the BiasedLocking 3097 if (UseBiasedLocking) { 3098 if (!VM_Version::use_biased_locking() && 3099 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3100 UseBiasedLocking = false; 3101 } 3102 } 3103 3104 return JNI_OK; 3105 } 3106 3107 int Arguments::PropertyList_count(SystemProperty* pl) { 3108 int count = 0; 3109 while(pl != NULL) { 3110 count++; 3111 pl = pl->next(); 3112 } 3113 return count; 3114 } 3115 3116 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3117 assert(key != NULL, "just checking"); 3118 SystemProperty* prop; 3119 for (prop = pl; prop != NULL; prop = prop->next()) { 3120 if (strcmp(key, prop->key()) == 0) return prop->value(); 3121 } 3122 return NULL; 3123 } 3124 3125 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3126 int count = 0; 3127 const char* ret_val = NULL; 3128 3129 while(pl != NULL) { 3130 if(count >= index) { 3131 ret_val = pl->key(); 3132 break; 3133 } 3134 count++; 3135 pl = pl->next(); 3136 } 3137 3138 return ret_val; 3139 } 3140 3141 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3142 int count = 0; 3143 char* ret_val = NULL; 3144 3145 while(pl != NULL) { 3146 if(count >= index) { 3147 ret_val = pl->value(); 3148 break; 3149 } 3150 count++; 3151 pl = pl->next(); 3152 } 3153 3154 return ret_val; 3155 } 3156 3157 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3158 SystemProperty* p = *plist; 3159 if (p == NULL) { 3160 *plist = new_p; 3161 } else { 3162 while (p->next() != NULL) { 3163 p = p->next(); 3164 } 3165 p->set_next(new_p); 3166 } 3167 } 3168 3169 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3170 if (plist == NULL) 3171 return; 3172 3173 SystemProperty* new_p = new SystemProperty(k, v, true); 3174 PropertyList_add(plist, new_p); 3175 } 3176 3177 // This add maintains unique property key in the list. 3178 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3179 if (plist == NULL) 3180 return; 3181 3182 // If property key exist then update with new value. 3183 SystemProperty* prop; 3184 for (prop = *plist; prop != NULL; prop = prop->next()) { 3185 if (strcmp(k, prop->key()) == 0) { 3186 if (append) { 3187 prop->append_value(v); 3188 } else { 3189 prop->set_value(v); 3190 } 3191 return; 3192 } 3193 } 3194 3195 PropertyList_add(plist, k, v); 3196 } 3197 3198 #ifdef KERNEL 3199 char *Arguments::get_kernel_properties() { 3200 // Find properties starting with kernel and append them to string 3201 // We need to find out how long they are first because the URL's that they 3202 // might point to could get long. 3203 int length = 0; 3204 SystemProperty* prop; 3205 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3206 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3207 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3208 } 3209 } 3210 // Add one for null terminator. 3211 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 3212 if (length != 0) { 3213 int pos = 0; 3214 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3215 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3216 jio_snprintf(&props[pos], length-pos, 3217 "-D%s=%s ", prop->key(), prop->value()); 3218 pos = strlen(props); 3219 } 3220 } 3221 } 3222 // null terminate props in case of null 3223 props[length] = '\0'; 3224 return props; 3225 } 3226 #endif // KERNEL 3227 3228 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3229 // Returns true if all of the source pointed by src has been copied over to 3230 // the destination buffer pointed by buf. Otherwise, returns false. 3231 // Notes: 3232 // 1. If the length (buflen) of the destination buffer excluding the 3233 // NULL terminator character is not long enough for holding the expanded 3234 // pid characters, it also returns false instead of returning the partially 3235 // expanded one. 3236 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3237 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3238 char* buf, size_t buflen) { 3239 const char* p = src; 3240 char* b = buf; 3241 const char* src_end = &src[srclen]; 3242 char* buf_end = &buf[buflen - 1]; 3243 3244 while (p < src_end && b < buf_end) { 3245 if (*p == '%') { 3246 switch (*(++p)) { 3247 case '%': // "%%" ==> "%" 3248 *b++ = *p++; 3249 break; 3250 case 'p': { // "%p" ==> current process id 3251 // buf_end points to the character before the last character so 3252 // that we could write '\0' to the end of the buffer. 3253 size_t buf_sz = buf_end - b + 1; 3254 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3255 3256 // if jio_snprintf fails or the buffer is not long enough to hold 3257 // the expanded pid, returns false. 3258 if (ret < 0 || ret >= (int)buf_sz) { 3259 return false; 3260 } else { 3261 b += ret; 3262 assert(*b == '\0', "fail in copy_expand_pid"); 3263 if (p == src_end && b == buf_end + 1) { 3264 // reach the end of the buffer. 3265 return true; 3266 } 3267 } 3268 p++; 3269 break; 3270 } 3271 default : 3272 *b++ = '%'; 3273 } 3274 } else { 3275 *b++ = *p++; 3276 } 3277 } 3278 *b = '\0'; 3279 return (p == src_end); // return false if not all of the source was copied 3280 }