arguments.cpp revision 356:1ee8caae33af
1/* 2 * Copyright 1997-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any 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 31char** Arguments::_jvm_flags_array = NULL; 32int Arguments::_num_jvm_flags = 0; 33char** Arguments::_jvm_args_array = NULL; 34int Arguments::_num_jvm_args = 0; 35char* Arguments::_java_command = NULL; 36SystemProperty* Arguments::_system_properties = NULL; 37const char* Arguments::_gc_log_filename = NULL; 38bool Arguments::_has_profile = false; 39bool Arguments::_has_alloc_profile = false; 40uintx Arguments::_initial_heap_size = 0; 41uintx Arguments::_min_heap_size = 0; 42Arguments::Mode Arguments::_mode = _mixed; 43bool Arguments::_java_compiler = false; 44bool Arguments::_xdebug_mode = false; 45const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 46const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 47int Arguments::_sun_java_launcher_pid = -1; 48 49// These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 50bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 51bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 52bool Arguments::_BackgroundCompilation = BackgroundCompilation; 53bool Arguments::_ClipInlining = ClipInlining; 54intx Arguments::_Tier2CompileThreshold = Tier2CompileThreshold; 55 56char* Arguments::SharedArchivePath = NULL; 57 58AgentLibraryList Arguments::_libraryList; 59AgentLibraryList Arguments::_agentList; 60 61abort_hook_t Arguments::_abort_hook = NULL; 62exit_hook_t Arguments::_exit_hook = NULL; 63vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 64 65 66SystemProperty *Arguments::_java_ext_dirs = NULL; 67SystemProperty *Arguments::_java_endorsed_dirs = NULL; 68SystemProperty *Arguments::_sun_boot_library_path = NULL; 69SystemProperty *Arguments::_java_library_path = NULL; 70SystemProperty *Arguments::_java_home = NULL; 71SystemProperty *Arguments::_java_class_path = NULL; 72SystemProperty *Arguments::_sun_boot_class_path = NULL; 73 74char* Arguments::_meta_index_path = NULL; 75char* Arguments::_meta_index_dir = NULL; 76 77static bool force_client_mode = false; 78 79// Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 80 81static bool match_option(const JavaVMOption *option, const char* name, 82 const char** tail) { 83 int len = (int)strlen(name); 84 if (strncmp(option->optionString, name, len) == 0) { 85 *tail = option->optionString + len; 86 return true; 87 } else { 88 return false; 89 } 90} 91 92static void logOption(const char* opt) { 93 if (PrintVMOptions) { 94 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 95 } 96} 97 98// Process java launcher properties. 99void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 100 // See if sun.java.launcher or sun.java.launcher.pid is defined. 101 // Must do this before setting up other system properties, 102 // as some of them may depend on launcher type. 103 for (int index = 0; index < args->nOptions; index++) { 104 const JavaVMOption* option = args->options + index; 105 const char* tail; 106 107 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 108 process_java_launcher_argument(tail, option->extraInfo); 109 continue; 110 } 111 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 112 _sun_java_launcher_pid = atoi(tail); 113 continue; 114 } 115 } 116} 117 118// Initialize system properties key and value. 119void Arguments::init_system_properties() { 120 121 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.version", "1.0", false)); 122 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 123 "Java Virtual Machine Specification", false)); 124 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.vendor", 125 "Sun Microsystems Inc.", false)); 126 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 127 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 128 PropertyList_add(&_system_properties, new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 129 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 130 131 // following are JVMTI agent writeable properties. 132 // Properties values are set to NULL and they are 133 // os specific they are initialized in os::init_system_properties_values(). 134 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 135 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 136 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 137 _java_library_path = new SystemProperty("java.library.path", NULL, true); 138 _java_home = new SystemProperty("java.home", NULL, true); 139 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 140 141 _java_class_path = new SystemProperty("java.class.path", "", true); 142 143 // Add to System Property list. 144 PropertyList_add(&_system_properties, _java_ext_dirs); 145 PropertyList_add(&_system_properties, _java_endorsed_dirs); 146 PropertyList_add(&_system_properties, _sun_boot_library_path); 147 PropertyList_add(&_system_properties, _java_library_path); 148 PropertyList_add(&_system_properties, _java_home); 149 PropertyList_add(&_system_properties, _java_class_path); 150 PropertyList_add(&_system_properties, _sun_boot_class_path); 151 152 // Set OS specific system properties values 153 os::init_system_properties_values(); 154} 155 156/** 157 * Provide a slightly more user-friendly way of eliminating -XX flags. 158 * When a flag is eliminated, it can be added to this list in order to 159 * continue accepting this flag on the command-line, while issuing a warning 160 * and ignoring the value. Once the JDK version reaches the 'accept_until' 161 * limit, we flatly refuse to admit the existence of the flag. This allows 162 * a flag to die correctly over JDK releases using HSX. 163 */ 164typedef struct { 165 const char* name; 166 JDK_Version obsoleted_in; // when the flag went away 167 JDK_Version accept_until; // which version to start denying the existence 168} ObsoleteFlag; 169 170static ObsoleteFlag obsolete_jvm_flags[] = { 171 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 172 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 173 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 174 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 175 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 176 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 177 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 178 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 179 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 180 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 181 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 182 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 183 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 184 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 185 { NULL, JDK_Version(0), JDK_Version(0) } 186}; 187 188// Returns true if the flag is obsolete and fits into the range specified 189// for being ignored. In the case that the flag is ignored, the 'version' 190// value is filled in with the version number when the flag became 191// obsolete so that that value can be displayed to the user. 192bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 193 int i = 0; 194 assert(version != NULL, "Must provide a version buffer"); 195 while (obsolete_jvm_flags[i].name != NULL) { 196 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 197 // <flag>=xxx form 198 // [-|+]<flag> form 199 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 200 ((s[0] == '+' || s[0] == '-') && 201 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 202 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 203 *version = flag_status.obsoleted_in; 204 return true; 205 } 206 } 207 i++; 208 } 209 return false; 210} 211 212// Constructs the system class path (aka boot class path) from the following 213// components, in order: 214// 215// prefix // from -Xbootclasspath/p:... 216// endorsed // the expansion of -Djava.endorsed.dirs=... 217// base // from os::get_system_properties() or -Xbootclasspath= 218// suffix // from -Xbootclasspath/a:... 219// 220// java.endorsed.dirs is a list of directories; any jar or zip files in the 221// directories are added to the sysclasspath just before the base. 222// 223// This could be AllStatic, but it isn't needed after argument processing is 224// complete. 225class SysClassPath: public StackObj { 226public: 227 SysClassPath(const char* base); 228 ~SysClassPath(); 229 230 inline void set_base(const char* base); 231 inline void add_prefix(const char* prefix); 232 inline void add_suffix(const char* suffix); 233 inline void reset_path(const char* base); 234 235 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 236 // property. Must be called after all command-line arguments have been 237 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 238 // combined_path(). 239 void expand_endorsed(); 240 241 inline const char* get_base() const { return _items[_scp_base]; } 242 inline const char* get_prefix() const { return _items[_scp_prefix]; } 243 inline const char* get_suffix() const { return _items[_scp_suffix]; } 244 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 245 246 // Combine all the components into a single c-heap-allocated string; caller 247 // must free the string if/when no longer needed. 248 char* combined_path(); 249 250private: 251 // Utility routines. 252 static char* add_to_path(const char* path, const char* str, bool prepend); 253 static char* add_jars_to_path(char* path, const char* directory); 254 255 inline void reset_item_at(int index); 256 257 // Array indices for the items that make up the sysclasspath. All except the 258 // base are allocated in the C heap and freed by this class. 259 enum { 260 _scp_prefix, // from -Xbootclasspath/p:... 261 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 262 _scp_base, // the default sysclasspath 263 _scp_suffix, // from -Xbootclasspath/a:... 264 _scp_nitems // the number of items, must be last. 265 }; 266 267 const char* _items[_scp_nitems]; 268 DEBUG_ONLY(bool _expansion_done;) 269}; 270 271SysClassPath::SysClassPath(const char* base) { 272 memset(_items, 0, sizeof(_items)); 273 _items[_scp_base] = base; 274 DEBUG_ONLY(_expansion_done = false;) 275} 276 277SysClassPath::~SysClassPath() { 278 // Free everything except the base. 279 for (int i = 0; i < _scp_nitems; ++i) { 280 if (i != _scp_base) reset_item_at(i); 281 } 282 DEBUG_ONLY(_expansion_done = false;) 283} 284 285inline void SysClassPath::set_base(const char* base) { 286 _items[_scp_base] = base; 287} 288 289inline void SysClassPath::add_prefix(const char* prefix) { 290 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 291} 292 293inline void SysClassPath::add_suffix(const char* suffix) { 294 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 295} 296 297inline void SysClassPath::reset_item_at(int index) { 298 assert(index < _scp_nitems && index != _scp_base, "just checking"); 299 if (_items[index] != NULL) { 300 FREE_C_HEAP_ARRAY(char, _items[index]); 301 _items[index] = NULL; 302 } 303} 304 305inline void SysClassPath::reset_path(const char* base) { 306 // Clear the prefix and suffix. 307 reset_item_at(_scp_prefix); 308 reset_item_at(_scp_suffix); 309 set_base(base); 310} 311 312//------------------------------------------------------------------------------ 313 314void SysClassPath::expand_endorsed() { 315 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 316 317 const char* path = Arguments::get_property("java.endorsed.dirs"); 318 if (path == NULL) { 319 path = Arguments::get_endorsed_dir(); 320 assert(path != NULL, "no default for java.endorsed.dirs"); 321 } 322 323 char* expanded_path = NULL; 324 const char separator = *os::path_separator(); 325 const char* const end = path + strlen(path); 326 while (path < end) { 327 const char* tmp_end = strchr(path, separator); 328 if (tmp_end == NULL) { 329 expanded_path = add_jars_to_path(expanded_path, path); 330 path = end; 331 } else { 332 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1); 333 memcpy(dirpath, path, tmp_end - path); 334 dirpath[tmp_end - path] = '\0'; 335 expanded_path = add_jars_to_path(expanded_path, dirpath); 336 FREE_C_HEAP_ARRAY(char, dirpath); 337 path = tmp_end + 1; 338 } 339 } 340 _items[_scp_endorsed] = expanded_path; 341 DEBUG_ONLY(_expansion_done = true;) 342} 343 344// Combine the bootclasspath elements, some of which may be null, into a single 345// c-heap-allocated string. 346char* SysClassPath::combined_path() { 347 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 348 assert(_expansion_done, "must call expand_endorsed() first."); 349 350 size_t lengths[_scp_nitems]; 351 size_t total_len = 0; 352 353 const char separator = *os::path_separator(); 354 355 // Get the lengths. 356 int i; 357 for (i = 0; i < _scp_nitems; ++i) { 358 if (_items[i] != NULL) { 359 lengths[i] = strlen(_items[i]); 360 // Include space for the separator char (or a NULL for the last item). 361 total_len += lengths[i] + 1; 362 } 363 } 364 assert(total_len > 0, "empty sysclasspath not allowed"); 365 366 // Copy the _items to a single string. 367 char* cp = NEW_C_HEAP_ARRAY(char, total_len); 368 char* cp_tmp = cp; 369 for (i = 0; i < _scp_nitems; ++i) { 370 if (_items[i] != NULL) { 371 memcpy(cp_tmp, _items[i], lengths[i]); 372 cp_tmp += lengths[i]; 373 *cp_tmp++ = separator; 374 } 375 } 376 *--cp_tmp = '\0'; // Replace the extra separator. 377 return cp; 378} 379 380// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 381char* 382SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 383 char *cp; 384 385 assert(str != NULL, "just checking"); 386 if (path == NULL) { 387 size_t len = strlen(str) + 1; 388 cp = NEW_C_HEAP_ARRAY(char, len); 389 memcpy(cp, str, len); // copy the trailing null 390 } else { 391 const char separator = *os::path_separator(); 392 size_t old_len = strlen(path); 393 size_t str_len = strlen(str); 394 size_t len = old_len + str_len + 2; 395 396 if (prepend) { 397 cp = NEW_C_HEAP_ARRAY(char, len); 398 char* cp_tmp = cp; 399 memcpy(cp_tmp, str, str_len); 400 cp_tmp += str_len; 401 *cp_tmp = separator; 402 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 403 FREE_C_HEAP_ARRAY(char, path); 404 } else { 405 cp = REALLOC_C_HEAP_ARRAY(char, path, len); 406 char* cp_tmp = cp + old_len; 407 *cp_tmp = separator; 408 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 409 } 410 } 411 return cp; 412} 413 414// Scan the directory and append any jar or zip files found to path. 415// Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 416char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 417 DIR* dir = os::opendir(directory); 418 if (dir == NULL) return path; 419 420 char dir_sep[2] = { '\0', '\0' }; 421 size_t directory_len = strlen(directory); 422 const char fileSep = *os::file_separator(); 423 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 424 425 /* Scan the directory for jars/zips, appending them to path. */ 426 struct dirent *entry; 427 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory)); 428 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 429 const char* name = entry->d_name; 430 const char* ext = name + strlen(name) - 4; 431 bool isJarOrZip = ext > name && 432 (os::file_name_strcmp(ext, ".jar") == 0 || 433 os::file_name_strcmp(ext, ".zip") == 0); 434 if (isJarOrZip) { 435 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name)); 436 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 437 path = add_to_path(path, jarpath, false); 438 FREE_C_HEAP_ARRAY(char, jarpath); 439 } 440 } 441 FREE_C_HEAP_ARRAY(char, dbuf); 442 os::closedir(dir); 443 return path; 444} 445 446// Parses a memory size specification string. 447static bool atomll(const char *s, jlong* result) { 448 jlong n = 0; 449 int args_read = sscanf(s, os::jlong_format_specifier(), &n); 450 if (args_read != 1) { 451 return false; 452 } 453 while (*s != '\0' && isdigit(*s)) { 454 s++; 455 } 456 // 4705540: illegal if more characters are found after the first non-digit 457 if (strlen(s) > 1) { 458 return false; 459 } 460 switch (*s) { 461 case 'T': case 't': 462 *result = n * G * K; 463 return true; 464 case 'G': case 'g': 465 *result = n * G; 466 return true; 467 case 'M': case 'm': 468 *result = n * M; 469 return true; 470 case 'K': case 'k': 471 *result = n * K; 472 return true; 473 case '\0': 474 *result = n; 475 return true; 476 default: 477 return false; 478 } 479} 480 481Arguments::ArgsRange Arguments::check_memory_size(jlong size, jlong min_size) { 482 if (size < min_size) return arg_too_small; 483 // Check that size will fit in a size_t (only relevant on 32-bit) 484 if ((julong) size > max_uintx) return arg_too_big; 485 return arg_in_range; 486} 487 488// Describe an argument out of range error 489void Arguments::describe_range_error(ArgsRange errcode) { 490 switch(errcode) { 491 case arg_too_big: 492 jio_fprintf(defaultStream::error_stream(), 493 "The specified size exceeds the maximum " 494 "representable size.\n"); 495 break; 496 case arg_too_small: 497 case arg_unreadable: 498 case arg_in_range: 499 // do nothing for now 500 break; 501 default: 502 ShouldNotReachHere(); 503 } 504} 505 506static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 507 return CommandLineFlags::boolAtPut(name, &value, origin); 508} 509 510 511static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 512 double v; 513 if (sscanf(value, "%lf", &v) != 1) { 514 return false; 515 } 516 517 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 518 return true; 519 } 520 return false; 521} 522 523 524static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 525 jlong v; 526 intx intx_v; 527 bool is_neg = false; 528 // Check the sign first since atomll() parses only unsigned values. 529 if (*value == '-') { 530 if (!CommandLineFlags::intxAt(name, &intx_v)) { 531 return false; 532 } 533 value++; 534 is_neg = true; 535 } 536 if (!atomll(value, &v)) { 537 return false; 538 } 539 intx_v = (intx) v; 540 if (is_neg) { 541 intx_v = -intx_v; 542 } 543 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 544 return true; 545 } 546 uintx uintx_v = (uintx) v; 547 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 548 return true; 549 } 550 return false; 551} 552 553 554static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 555 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 556 // Contract: CommandLineFlags always returns a pointer that needs freeing. 557 FREE_C_HEAP_ARRAY(char, value); 558 return true; 559} 560 561static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 562 const char* old_value = ""; 563 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 564 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 565 size_t new_len = strlen(new_value); 566 const char* value; 567 char* free_this_too = NULL; 568 if (old_len == 0) { 569 value = new_value; 570 } else if (new_len == 0) { 571 value = old_value; 572 } else { 573 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1); 574 // each new setting adds another LINE to the switch: 575 sprintf(buf, "%s\n%s", old_value, new_value); 576 value = buf; 577 free_this_too = buf; 578 } 579 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 580 // CommandLineFlags always returns a pointer that needs freeing. 581 FREE_C_HEAP_ARRAY(char, value); 582 if (free_this_too != NULL) { 583 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 584 FREE_C_HEAP_ARRAY(char, free_this_too); 585 } 586 return true; 587} 588 589 590bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 591 592 // range of acceptable characters spelled out for portability reasons 593#define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 594#define BUFLEN 255 595 char name[BUFLEN+1]; 596 char dummy; 597 598 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 599 return set_bool_flag(name, false, origin); 600 } 601 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 602 return set_bool_flag(name, true, origin); 603 } 604 605 char punct; 606 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 607 const char* value = strchr(arg, '=') + 1; 608 Flag* flag = Flag::find_flag(name, strlen(name)); 609 if (flag != NULL && flag->is_ccstr()) { 610 if (flag->ccstr_accumulates()) { 611 return append_to_string_flag(name, value, origin); 612 } else { 613 if (value[0] == '\0') { 614 value = NULL; 615 } 616 return set_string_flag(name, value, origin); 617 } 618 } 619 } 620 621 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 622 const char* value = strchr(arg, '=') + 1; 623 // -XX:Foo:=xxx will reset the string flag to the given value. 624 if (value[0] == '\0') { 625 value = NULL; 626 } 627 return set_string_flag(name, value, origin); 628 } 629 630#define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 631#define SIGNED_NUMBER_RANGE "[-0123456789]" 632#define NUMBER_RANGE "[0123456789]" 633 char value[BUFLEN + 1]; 634 char value2[BUFLEN + 1]; 635 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 636 // Looks like a floating-point number -- try again with more lenient format string 637 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 638 return set_fp_numeric_flag(name, value, origin); 639 } 640 } 641 642#define VALUE_RANGE "[-kmgtKMGT0123456789]" 643 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 644 return set_numeric_flag(name, value, origin); 645 } 646 647 return false; 648} 649 650 651void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 652 assert(bldarray != NULL, "illegal argument"); 653 654 if (arg == NULL) { 655 return; 656 } 657 658 int index = *count; 659 660 // expand the array and add arg to the last element 661 (*count)++; 662 if (*bldarray == NULL) { 663 *bldarray = NEW_C_HEAP_ARRAY(char*, *count); 664 } else { 665 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count); 666 } 667 (*bldarray)[index] = strdup(arg); 668} 669 670void Arguments::build_jvm_args(const char* arg) { 671 add_string(&_jvm_args_array, &_num_jvm_args, arg); 672} 673 674void Arguments::build_jvm_flags(const char* arg) { 675 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 676} 677 678// utility function to return a string that concatenates all 679// strings in a given char** array 680const char* Arguments::build_resource_string(char** args, int count) { 681 if (args == NULL || count == 0) { 682 return NULL; 683 } 684 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 685 for (int i = 1; i < count; i++) { 686 length += strlen(args[i]) + 1; // add 1 for a space 687 } 688 char* s = NEW_RESOURCE_ARRAY(char, length); 689 strcpy(s, args[0]); 690 for (int j = 1; j < count; j++) { 691 strcat(s, " "); 692 strcat(s, args[j]); 693 } 694 return (const char*) s; 695} 696 697void Arguments::print_on(outputStream* st) { 698 st->print_cr("VM Arguments:"); 699 if (num_jvm_flags() > 0) { 700 st->print("jvm_flags: "); print_jvm_flags_on(st); 701 } 702 if (num_jvm_args() > 0) { 703 st->print("jvm_args: "); print_jvm_args_on(st); 704 } 705 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 706 st->print_cr("Launcher Type: %s", _sun_java_launcher); 707} 708 709void Arguments::print_jvm_flags_on(outputStream* st) { 710 if (_num_jvm_flags > 0) { 711 for (int i=0; i < _num_jvm_flags; i++) { 712 st->print("%s ", _jvm_flags_array[i]); 713 } 714 st->print_cr(""); 715 } 716} 717 718void Arguments::print_jvm_args_on(outputStream* st) { 719 if (_num_jvm_args > 0) { 720 for (int i=0; i < _num_jvm_args; i++) { 721 st->print("%s ", _jvm_args_array[i]); 722 } 723 st->print_cr(""); 724 } 725} 726 727bool Arguments::process_argument(const char* arg, 728 jboolean ignore_unrecognized, FlagValueOrigin origin) { 729 730 JDK_Version since = JDK_Version(); 731 732 if (parse_argument(arg, origin)) { 733 // do nothing 734 } else if (is_newly_obsolete(arg, &since)) { 735 enum { bufsize = 256 }; 736 char buffer[bufsize]; 737 since.to_string(buffer, bufsize); 738 jio_fprintf(defaultStream::error_stream(), 739 "Warning: The flag %s has been EOL'd as of %s and will" 740 " be ignored\n", arg, buffer); 741 } else { 742 if (!ignore_unrecognized) { 743 jio_fprintf(defaultStream::error_stream(), 744 "Unrecognized VM option '%s'\n", arg); 745 // allow for commandline "commenting out" options like -XX:#+Verbose 746 if (strlen(arg) == 0 || arg[0] != '#') { 747 return false; 748 } 749 } 750 } 751 return true; 752} 753 754 755bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 756 FILE* stream = fopen(file_name, "rb"); 757 if (stream == NULL) { 758 if (should_exist) { 759 jio_fprintf(defaultStream::error_stream(), 760 "Could not open settings file %s\n", file_name); 761 return false; 762 } else { 763 return true; 764 } 765 } 766 767 char token[1024]; 768 int pos = 0; 769 770 bool in_white_space = true; 771 bool in_comment = false; 772 bool in_quote = false; 773 char quote_c = 0; 774 bool result = true; 775 776 int c = getc(stream); 777 while(c != EOF) { 778 if (in_white_space) { 779 if (in_comment) { 780 if (c == '\n') in_comment = false; 781 } else { 782 if (c == '#') in_comment = true; 783 else if (!isspace(c)) { 784 in_white_space = false; 785 token[pos++] = c; 786 } 787 } 788 } else { 789 if (c == '\n' || (!in_quote && isspace(c))) { 790 // token ends at newline, or at unquoted whitespace 791 // this allows a way to include spaces in string-valued options 792 token[pos] = '\0'; 793 logOption(token); 794 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 795 build_jvm_flags(token); 796 pos = 0; 797 in_white_space = true; 798 in_quote = false; 799 } else if (!in_quote && (c == '\'' || c == '"')) { 800 in_quote = true; 801 quote_c = c; 802 } else if (in_quote && (c == quote_c)) { 803 in_quote = false; 804 } else { 805 token[pos++] = c; 806 } 807 } 808 c = getc(stream); 809 } 810 if (pos > 0) { 811 token[pos] = '\0'; 812 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 813 build_jvm_flags(token); 814 } 815 fclose(stream); 816 return result; 817} 818 819//============================================================================================================= 820// Parsing of properties (-D) 821 822const char* Arguments::get_property(const char* key) { 823 return PropertyList_get_value(system_properties(), key); 824} 825 826bool Arguments::add_property(const char* prop) { 827 const char* eq = strchr(prop, '='); 828 char* key; 829 // ns must be static--its address may be stored in a SystemProperty object. 830 const static char ns[1] = {0}; 831 char* value = (char *)ns; 832 833 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 834 key = AllocateHeap(key_len + 1, "add_property"); 835 strncpy(key, prop, key_len); 836 key[key_len] = '\0'; 837 838 if (eq != NULL) { 839 size_t value_len = strlen(prop) - key_len - 1; 840 value = AllocateHeap(value_len + 1, "add_property"); 841 strncpy(value, &prop[key_len + 1], value_len + 1); 842 } 843 844 if (strcmp(key, "java.compiler") == 0) { 845 process_java_compiler_argument(value); 846 FreeHeap(key); 847 if (eq != NULL) { 848 FreeHeap(value); 849 } 850 return true; 851 } 852 else if (strcmp(key, "sun.java.command") == 0) { 853 854 _java_command = value; 855 856 // don't add this property to the properties exposed to the java application 857 FreeHeap(key); 858 return true; 859 } 860 else if (strcmp(key, "sun.java.launcher.pid") == 0) { 861 // launcher.pid property is private and is processed 862 // in process_sun_java_launcher_properties(); 863 // the sun.java.launcher property is passed on to the java application 864 FreeHeap(key); 865 if (eq != NULL) { 866 FreeHeap(value); 867 } 868 return true; 869 } 870 else if (strcmp(key, "java.vendor.url.bug") == 0) { 871 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 872 // its value without going through the property list or making a Java call. 873 _java_vendor_url_bug = value; 874 } 875 876 // Create new property and add at the end of the list 877 PropertyList_unique_add(&_system_properties, key, value); 878 return true; 879} 880 881//=========================================================================================================== 882// Setting int/mixed/comp mode flags 883 884void Arguments::set_mode_flags(Mode mode) { 885 // Set up default values for all flags. 886 // If you add a flag to any of the branches below, 887 // add a default value for it here. 888 set_java_compiler(false); 889 _mode = mode; 890 891 // Ensure Agent_OnLoad has the correct initial values. 892 // This may not be the final mode; mode may change later in onload phase. 893 PropertyList_unique_add(&_system_properties, "java.vm.info", 894 (char*)Abstract_VM_Version::vm_info_string()); 895 896 UseInterpreter = true; 897 UseCompiler = true; 898 UseLoopCounter = true; 899 900 // Default values may be platform/compiler dependent - 901 // use the saved values 902 ClipInlining = Arguments::_ClipInlining; 903 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 904 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 905 BackgroundCompilation = Arguments::_BackgroundCompilation; 906 Tier2CompileThreshold = Arguments::_Tier2CompileThreshold; 907 908 // Change from defaults based on mode 909 switch (mode) { 910 default: 911 ShouldNotReachHere(); 912 break; 913 case _int: 914 UseCompiler = false; 915 UseLoopCounter = false; 916 AlwaysCompileLoopMethods = false; 917 UseOnStackReplacement = false; 918 break; 919 case _mixed: 920 // same as default 921 break; 922 case _comp: 923 UseInterpreter = false; 924 BackgroundCompilation = false; 925 ClipInlining = false; 926 break; 927 } 928} 929 930 931// Conflict: required to use shared spaces (-Xshare:on), but 932// incompatible command line options were chosen. 933 934static void no_shared_spaces() { 935 if (RequireSharedSpaces) { 936 jio_fprintf(defaultStream::error_stream(), 937 "Class data sharing is inconsistent with other specified options.\n"); 938 vm_exit_during_initialization("Unable to use shared archive.", NULL); 939 } else { 940 FLAG_SET_DEFAULT(UseSharedSpaces, false); 941 } 942} 943 944 945// If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 946// if it's not explictly set or unset. If the user has chosen 947// UseParNewGC and not explicitly set ParallelGCThreads we 948// set it, unless this is a single cpu machine. 949void Arguments::set_parnew_gc_flags() { 950 assert(!UseSerialGC && !UseParallelGC && !UseG1GC, 951 "control point invariant"); 952 assert(UseParNewGC, "Error"); 953 954 // Turn off AdaptiveSizePolicy by default for parnew until it is 955 // complete. 956 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 957 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 958 } 959 960 if (ParallelGCThreads == 0) { 961 FLAG_SET_DEFAULT(ParallelGCThreads, 962 Abstract_VM_Version::parallel_worker_threads()); 963 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 964 FLAG_SET_DEFAULT(UseParNewGC, false); 965 } 966 } 967 if (!UseParNewGC) { 968 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 969 } else { 970 no_shared_spaces(); 971 972 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 correspondinly, 973 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 974 // we set them to 1024 and 1024. 975 // See CR 6362902. 976 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 977 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 978 } 979 if (FLAG_IS_DEFAULT(OldPLABSize)) { 980 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 981 } 982 983 // AlwaysTenure flag should make ParNew to promote all at first collection. 984 // See CR 6362902. 985 if (AlwaysTenure) { 986 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 987 } 988 } 989} 990 991// Adjust some sizes to suit CMS and/or ParNew needs; these work well on 992// sparc/solaris for certain applications, but would gain from 993// further optimization and tuning efforts, and would almost 994// certainly gain from analysis of platform and environment. 995void Arguments::set_cms_and_parnew_gc_flags() { 996 assert(!UseSerialGC && !UseParallelGC, "Error"); 997 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 998 999 // If we are using CMS, we prefer to UseParNewGC, 1000 // unless explicitly forbidden. 1001 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1002 FLAG_SET_ERGO(bool, UseParNewGC, true); 1003 } 1004 1005 // Turn off AdaptiveSizePolicy by default for cms until it is 1006 // complete. 1007 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1008 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1009 } 1010 1011 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1012 // as needed. 1013 if (UseParNewGC) { 1014 set_parnew_gc_flags(); 1015 } 1016 1017 // Now make adjustments for CMS 1018 size_t young_gen_per_worker; 1019 intx new_ratio; 1020 size_t min_new_default; 1021 intx tenuring_default; 1022 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0 1023 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) { 1024 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M); 1025 } 1026 young_gen_per_worker = 4*M; 1027 new_ratio = (intx)15; 1028 min_new_default = 4*M; 1029 tenuring_default = (intx)0; 1030 } else { // new defaults: "new" as of 6.0 1031 young_gen_per_worker = CMSYoungGenPerWorker; 1032 new_ratio = (intx)7; 1033 min_new_default = 16*M; 1034 tenuring_default = (intx)4; 1035 } 1036 1037 // Preferred young gen size for "short" pauses 1038 const uintx parallel_gc_threads = 1039 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1040 const size_t preferred_max_new_size_unaligned = 1041 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads); 1042 const size_t preferred_max_new_size = 1043 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1044 1045 // Unless explicitly requested otherwise, size young gen 1046 // for "short" pauses ~ 4M*ParallelGCThreads 1047 if (FLAG_IS_DEFAULT(MaxNewSize)) { // MaxNewSize not set at command-line 1048 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1049 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1050 } else { 1051 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1052 } 1053 if(PrintGCDetails && Verbose) { 1054 // Too early to use gclog_or_tty 1055 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1056 } 1057 } 1058 // Unless explicitly requested otherwise, prefer a large 1059 // Old to Young gen size so as to shift the collection load 1060 // to the old generation concurrent collector 1061 if (FLAG_IS_DEFAULT(NewRatio)) { 1062 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio)); 1063 1064 size_t min_new = align_size_up(ScaleForWordSize(min_new_default), os::vm_page_size()); 1065 size_t prev_initial_size = initial_heap_size(); 1066 if (prev_initial_size != 0 && prev_initial_size < min_new+OldSize) { 1067 set_initial_heap_size(min_new+OldSize); 1068 // Currently minimum size and the initial heap sizes are the same. 1069 set_min_heap_size(initial_heap_size()); 1070 if (PrintGCDetails && Verbose) { 1071 warning("Initial heap size increased to " SIZE_FORMAT " M from " 1072 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.", 1073 initial_heap_size()/M, prev_initial_size/M); 1074 } 1075 } 1076 // MaxHeapSize is aligned down in collectorPolicy 1077 size_t max_heap = align_size_down(MaxHeapSize, 1078 CardTableRS::ct_max_alignment_constraint()); 1079 1080 if(PrintGCDetails && Verbose) { 1081 // Too early to use gclog_or_tty 1082 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1083 " initial_heap_size: " SIZE_FORMAT 1084 " max_heap: " SIZE_FORMAT, 1085 min_heap_size(), initial_heap_size(), max_heap); 1086 } 1087 if (max_heap > min_new) { 1088 // Unless explicitly requested otherwise, make young gen 1089 // at least min_new, and at most preferred_max_new_size. 1090 if (FLAG_IS_DEFAULT(NewSize)) { 1091 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1092 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1093 if(PrintGCDetails && Verbose) { 1094 // Too early to use gclog_or_tty 1095 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize); 1096 } 1097 } 1098 // Unless explicitly requested otherwise, size old gen 1099 // so that it's at least 3X of NewSize to begin with; 1100 // later NewRatio will decide how it grows; see above. 1101 if (FLAG_IS_DEFAULT(OldSize)) { 1102 if (max_heap > NewSize) { 1103 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize)); 1104 if(PrintGCDetails && Verbose) { 1105 // Too early to use gclog_or_tty 1106 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize); 1107 } 1108 } 1109 } 1110 } 1111 } 1112 // Unless explicitly requested otherwise, definitely 1113 // promote all objects surviving "tenuring_default" scavenges. 1114 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1115 FLAG_IS_DEFAULT(SurvivorRatio)) { 1116 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1117 } 1118 // If we decided above (or user explicitly requested) 1119 // `promote all' (via MaxTenuringThreshold := 0), 1120 // prefer minuscule survivor spaces so as not to waste 1121 // space for (non-existent) survivors 1122 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1123 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1124 } 1125 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1126 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1127 // This is done in order to make ParNew+CMS configuration to work 1128 // with YoungPLABSize and OldPLABSize options. 1129 // See CR 6362902. 1130 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1131 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1132 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1133 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1134 // the value (either from the command line or ergonomics) of 1135 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1136 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1137 } 1138 else { 1139 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1140 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1141 // we'll let it to take precedence. 1142 jio_fprintf(defaultStream::error_stream(), 1143 "Both OldPLABSize and CMSParPromoteBlocksToClaim options are specified " 1144 "for the CMS collector. CMSParPromoteBlocksToClaim will take precedence.\n"); 1145 } 1146 } 1147} 1148 1149inline uintx max_heap_for_compressed_oops() { 1150 LP64_ONLY(return oopDesc::OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1151 NOT_LP64(return DefaultMaxRAM); 1152} 1153 1154bool Arguments::should_auto_select_low_pause_collector() { 1155 if (UseAutoGCSelectPolicy && 1156 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1157 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1158 if (PrintGCDetails) { 1159 // Cannot use gclog_or_tty yet. 1160 tty->print_cr("Automatic selection of the low pause collector" 1161 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1162 } 1163 return true; 1164 } 1165 return false; 1166} 1167 1168void Arguments::set_ergonomics_flags() { 1169 // Parallel GC is not compatible with sharing. If one specifies 1170 // that they want sharing explicitly, do not set ergonmics flags. 1171 if (DumpSharedSpaces || ForceSharedSpaces) { 1172 return; 1173 } 1174 1175 if (os::is_server_class_machine() && !force_client_mode ) { 1176 // If no other collector is requested explicitly, 1177 // let the VM select the collector based on 1178 // machine class and automatic selection policy. 1179 if (!UseSerialGC && 1180 !UseConcMarkSweepGC && 1181 !UseG1GC && 1182 !UseParNewGC && 1183 !DumpSharedSpaces && 1184 FLAG_IS_DEFAULT(UseParallelGC)) { 1185 if (should_auto_select_low_pause_collector()) { 1186 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1187 } else { 1188 FLAG_SET_ERGO(bool, UseParallelGC, true); 1189 } 1190 no_shared_spaces(); 1191 } 1192 } 1193 1194#ifdef _LP64 1195 // Compressed Headers do not work with CMS, which uses a bit in the klass 1196 // field offset to determine free list chunk markers. 1197 // Check that UseCompressedOops can be set with the max heap size allocated 1198 // by ergonomics. 1199 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1200 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) { 1201 // Turn off until bug is fixed. 1202 // the following line to return it to default status. 1203 // FLAG_SET_ERGO(bool, UseCompressedOops, true); 1204 } else if (UseCompressedOops && UseG1GC) { 1205 warning(" UseCompressedOops does not currently work with UseG1GC; switching off UseCompressedOops. "); 1206 FLAG_SET_DEFAULT(UseCompressedOops, false); 1207 } 1208 } else { 1209 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1210 warning("Max heap size too large for Compressed Oops"); 1211 FLAG_SET_DEFAULT(UseCompressedOops, false); 1212 } 1213 } 1214 // Also checks that certain machines are slower with compressed oops 1215 // in vm_version initialization code. 1216#endif // _LP64 1217} 1218 1219void Arguments::set_parallel_gc_flags() { 1220 assert(UseParallelGC || UseParallelOldGC, "Error"); 1221 // If parallel old was requested, automatically enable parallel scavenge. 1222 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) { 1223 FLAG_SET_DEFAULT(UseParallelGC, true); 1224 } 1225 1226 // If no heap maximum was requested explicitly, use some reasonable fraction 1227 // of the physical memory, up to a maximum of 1GB. 1228 if (UseParallelGC) { 1229 FLAG_SET_ERGO(uintx, ParallelGCThreads, 1230 Abstract_VM_Version::parallel_worker_threads()); 1231 1232 // PS is a server collector, setup the heap sizes accordingly. 1233 set_server_heap_size(); 1234 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1235 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1236 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1237 // See CR 6362902 for details. 1238 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1239 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1240 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1241 } 1242 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1243 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1244 } 1245 } 1246 1247 if (UseParallelOldGC) { 1248 // Par compact uses lower default values since they are treated as 1249 // minimums. These are different defaults because of the different 1250 // interpretation and are not ergonomically set. 1251 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1252 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1253 } 1254 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1255 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1256 } 1257 } 1258 } 1259} 1260 1261void Arguments::set_g1_gc_flags() { 1262 assert(UseG1GC, "Error"); 1263 // G1 is a server collector, setup the heap sizes accordingly. 1264 set_server_heap_size(); 1265#ifdef COMPILER1 1266 FastTLABRefill = false; 1267#endif 1268 FLAG_SET_DEFAULT(ParallelGCThreads, 1269 Abstract_VM_Version::parallel_worker_threads()); 1270 if (ParallelGCThreads == 0) { 1271 FLAG_SET_DEFAULT(ParallelGCThreads, 1272 Abstract_VM_Version::parallel_worker_threads 1273()); 1274 } 1275 no_shared_spaces(); 1276} 1277 1278void Arguments::set_server_heap_size() { 1279 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1280 const uint64_t reasonable_fraction = 1281 os::physical_memory() / DefaultMaxRAMFraction; 1282 const uint64_t maximum_size = (uint64_t) 1283 (FLAG_IS_DEFAULT(DefaultMaxRAM) && UseCompressedOops ? 1284 MIN2(max_heap_for_compressed_oops(), DefaultMaxRAM) : 1285 DefaultMaxRAM); 1286 size_t reasonable_max = 1287 (size_t) os::allocatable_physical_memory(reasonable_fraction); 1288 if (reasonable_max > maximum_size) { 1289 reasonable_max = maximum_size; 1290 } 1291 if (PrintGCDetails && Verbose) { 1292 // Cannot use gclog_or_tty yet. 1293 tty->print_cr(" Max heap size for server class platform " 1294 SIZE_FORMAT, reasonable_max); 1295 } 1296 // If the initial_heap_size has not been set with -Xms, 1297 // then set it as fraction of size of physical memory 1298 // respecting the maximum and minimum sizes of the heap. 1299 if (initial_heap_size() == 0) { 1300 const uint64_t reasonable_initial_fraction = 1301 os::physical_memory() / DefaultInitialRAMFraction; 1302 const size_t reasonable_initial = 1303 (size_t) os::allocatable_physical_memory(reasonable_initial_fraction); 1304 const size_t minimum_size = NewSize + OldSize; 1305 set_initial_heap_size(MAX2(MIN2(reasonable_initial, reasonable_max), 1306 minimum_size)); 1307 // Currently the minimum size and the initial heap sizes are the same. 1308 set_min_heap_size(initial_heap_size()); 1309 if (PrintGCDetails && Verbose) { 1310 // Cannot use gclog_or_tty yet. 1311 tty->print_cr(" Initial heap size for server class platform " 1312 SIZE_FORMAT, initial_heap_size()); 1313 } 1314 } else { 1315 // A minimum size was specified on the command line. Be sure 1316 // that the maximum size is consistent. 1317 if (initial_heap_size() > reasonable_max) { 1318 reasonable_max = initial_heap_size(); 1319 } 1320 } 1321 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx) reasonable_max); 1322 } 1323} 1324 1325// This must be called after ergonomics because we want bytecode rewriting 1326// if the server compiler is used, or if UseSharedSpaces is disabled. 1327void Arguments::set_bytecode_flags() { 1328 // Better not attempt to store into a read-only space. 1329 if (UseSharedSpaces) { 1330 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1331 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1332 } 1333 1334 if (!RewriteBytecodes) { 1335 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1336 } 1337} 1338 1339// Aggressive optimization flags -XX:+AggressiveOpts 1340void Arguments::set_aggressive_opts_flags() { 1341#ifdef COMPILER2 1342 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1343 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1344 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1345 } 1346 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1347 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1348 } 1349 1350 // Feed the cache size setting into the JDK 1351 char buffer[1024]; 1352 sprintf(buffer, "java.lang.Integer.IntegerCache.high=%d", AutoBoxCacheMax); 1353 add_property(buffer); 1354 } 1355 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1356 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1357 } 1358 if (AggressiveOpts && FLAG_IS_DEFAULT(SpecialArraysEquals)) { 1359 FLAG_SET_DEFAULT(SpecialArraysEquals, true); 1360 } 1361#endif 1362 1363 if (AggressiveOpts) { 1364// Sample flag setting code 1365// if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1366// FLAG_SET_DEFAULT(EliminateZeroing, true); 1367// } 1368 } 1369} 1370 1371//=========================================================================================================== 1372// Parsing of java.compiler property 1373 1374void Arguments::process_java_compiler_argument(char* arg) { 1375 // For backwards compatibility, Djava.compiler=NONE or "" 1376 // causes us to switch to -Xint mode UNLESS -Xdebug 1377 // is also specified. 1378 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1379 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1380 } 1381} 1382 1383void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1384 _sun_java_launcher = strdup(launcher); 1385} 1386 1387bool Arguments::created_by_java_launcher() { 1388 assert(_sun_java_launcher != NULL, "property must have value"); 1389 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1390} 1391 1392//=========================================================================================================== 1393// Parsing of main arguments 1394 1395bool Arguments::verify_percentage(uintx value, const char* name) { 1396 if (value <= 100) { 1397 return true; 1398 } 1399 jio_fprintf(defaultStream::error_stream(), 1400 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1401 name, value); 1402 return false; 1403} 1404 1405static void set_serial_gc_flags() { 1406 FLAG_SET_DEFAULT(UseSerialGC, true); 1407 FLAG_SET_DEFAULT(UseParNewGC, false); 1408 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1409 FLAG_SET_DEFAULT(UseParallelGC, false); 1410 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1411 FLAG_SET_DEFAULT(UseG1GC, false); 1412} 1413 1414static bool verify_serial_gc_flags() { 1415 return (UseSerialGC && 1416 !(UseParNewGC || UseConcMarkSweepGC || UseG1GC || 1417 UseParallelGC || UseParallelOldGC)); 1418} 1419 1420// Check consistency of GC selection 1421bool Arguments::check_gc_consistency() { 1422 bool status = true; 1423 // Ensure that the user has not selected conflicting sets 1424 // of collectors. [Note: this check is merely a user convenience; 1425 // collectors over-ride each other so that only a non-conflicting 1426 // set is selected; however what the user gets is not what they 1427 // may have expected from the combination they asked for. It's 1428 // better to reduce user confusion by not allowing them to 1429 // select conflicting combinations. 1430 uint i = 0; 1431 if (UseSerialGC) i++; 1432 if (UseConcMarkSweepGC || UseParNewGC) i++; 1433 if (UseParallelGC || UseParallelOldGC) i++; 1434 if (i > 1) { 1435 jio_fprintf(defaultStream::error_stream(), 1436 "Conflicting collector combinations in option list; " 1437 "please refer to the release notes for the combinations " 1438 "allowed\n"); 1439 status = false; 1440 } 1441 1442 return status; 1443} 1444 1445// Check the consistency of vm_init_args 1446bool Arguments::check_vm_args_consistency() { 1447 // Method for adding checks for flag consistency. 1448 // The intent is to warn the user of all possible conflicts, 1449 // before returning an error. 1450 // Note: Needs platform-dependent factoring. 1451 bool status = true; 1452 1453#if ( (defined(COMPILER2) && defined(SPARC))) 1454 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1455 // on sparc doesn't require generation of a stub as is the case on, e.g., 1456 // x86. Normally, VM_Version_init must be called from init_globals in 1457 // init.cpp, which is called by the initial java thread *after* arguments 1458 // have been parsed. VM_Version_init gets called twice on sparc. 1459 extern void VM_Version_init(); 1460 VM_Version_init(); 1461 if (!VM_Version::has_v9()) { 1462 jio_fprintf(defaultStream::error_stream(), 1463 "V8 Machine detected, Server requires V9\n"); 1464 status = false; 1465 } 1466#endif /* COMPILER2 && SPARC */ 1467 1468 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1469 // builds so the cost of stack banging can be measured. 1470#if (defined(PRODUCT) && defined(SOLARIS)) 1471 if (!UseBoundThreads && !UseStackBanging) { 1472 jio_fprintf(defaultStream::error_stream(), 1473 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1474 1475 status = false; 1476 } 1477#endif 1478 1479 if (TLABRefillWasteFraction == 0) { 1480 jio_fprintf(defaultStream::error_stream(), 1481 "TLABRefillWasteFraction should be a denominator, " 1482 "not " SIZE_FORMAT "\n", 1483 TLABRefillWasteFraction); 1484 status = false; 1485 } 1486 1487 status = status && verify_percentage(MaxLiveObjectEvacuationRatio, 1488 "MaxLiveObjectEvacuationRatio"); 1489 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1490 "AdaptiveSizePolicyWeight"); 1491 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1492 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1493 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1494 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1495 1496 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1497 jio_fprintf(defaultStream::error_stream(), 1498 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1499 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1500 MinHeapFreeRatio, MaxHeapFreeRatio); 1501 status = false; 1502 } 1503 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1504 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1505 1506 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1507 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1508 } 1509 1510 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1511 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1512 if (GCTimeLimit == 100) { 1513 // Turn off gc-overhead-limit-exceeded checks 1514 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1515 } 1516 1517 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1518 1519 // Check user specified sharing option conflict with Parallel GC 1520 bool cannot_share = (UseConcMarkSweepGC || UseG1GC || UseParNewGC || 1521 UseParallelGC || UseParallelOldGC || 1522 SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages)); 1523 1524 if (cannot_share) { 1525 // Either force sharing on by forcing the other options off, or 1526 // force sharing off. 1527 if (DumpSharedSpaces || ForceSharedSpaces) { 1528 set_serial_gc_flags(); 1529 FLAG_SET_DEFAULT(SOLARIS_ONLY(UseISM) NOT_SOLARIS(UseLargePages), false); 1530 } else { 1531 no_shared_spaces(); 1532 } 1533 } 1534 1535 status = status && check_gc_consistency(); 1536 1537 if (_has_alloc_profile) { 1538 if (UseParallelGC || UseParallelOldGC) { 1539 jio_fprintf(defaultStream::error_stream(), 1540 "error: invalid argument combination.\n" 1541 "Allocation profiling (-Xaprof) cannot be used together with " 1542 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1543 status = false; 1544 } 1545 if (UseConcMarkSweepGC) { 1546 jio_fprintf(defaultStream::error_stream(), 1547 "error: invalid argument combination.\n" 1548 "Allocation profiling (-Xaprof) cannot be used together with " 1549 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1550 status = false; 1551 } 1552 } 1553 1554 if (CMSIncrementalMode) { 1555 if (!UseConcMarkSweepGC) { 1556 jio_fprintf(defaultStream::error_stream(), 1557 "error: invalid argument combination.\n" 1558 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1559 "selected in order\nto use CMSIncrementalMode.\n"); 1560 status = false; 1561 } else { 1562 status = status && verify_percentage(CMSIncrementalDutyCycle, 1563 "CMSIncrementalDutyCycle"); 1564 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1565 "CMSIncrementalDutyCycleMin"); 1566 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1567 "CMSIncrementalSafetyFactor"); 1568 status = status && verify_percentage(CMSIncrementalOffset, 1569 "CMSIncrementalOffset"); 1570 status = status && verify_percentage(CMSExpAvgFactor, 1571 "CMSExpAvgFactor"); 1572 // If it was not set on the command line, set 1573 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1574 if (CMSInitiatingOccupancyFraction < 0) { 1575 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1576 } 1577 } 1578 } 1579 1580 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1581 // insists that we hold the requisite locks so that the iteration is 1582 // MT-safe. For the verification at start-up and shut-down, we don't 1583 // yet have a good way of acquiring and releasing these locks, 1584 // which are not visible at the CollectedHeap level. We want to 1585 // be able to acquire these locks and then do the iteration rather 1586 // than just disable the lock verification. This will be fixed under 1587 // bug 4788986. 1588 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1589 if (VerifyGCStartAt == 0) { 1590 warning("Heap verification at start-up disabled " 1591 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1592 VerifyGCStartAt = 1; // Disable verification at start-up 1593 } 1594 if (VerifyBeforeExit) { 1595 warning("Heap verification at shutdown disabled " 1596 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1597 VerifyBeforeExit = false; // Disable verification at shutdown 1598 } 1599 } 1600 1601 // Note: only executed in non-PRODUCT mode 1602 if (!UseAsyncConcMarkSweepGC && 1603 (ExplicitGCInvokesConcurrent || 1604 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1605 jio_fprintf(defaultStream::error_stream(), 1606 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1607 " with -UseAsyncConcMarkSweepGC"); 1608 status = false; 1609 } 1610 1611 return status; 1612} 1613 1614bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1615 const char* option_type) { 1616 if (ignore) return false; 1617 1618 const char* spacer = " "; 1619 if (option_type == NULL) { 1620 option_type = ++spacer; // Set both to the empty string. 1621 } 1622 1623 if (os::obsolete_option(option)) { 1624 jio_fprintf(defaultStream::error_stream(), 1625 "Obsolete %s%soption: %s\n", option_type, spacer, 1626 option->optionString); 1627 return false; 1628 } else { 1629 jio_fprintf(defaultStream::error_stream(), 1630 "Unrecognized %s%soption: %s\n", option_type, spacer, 1631 option->optionString); 1632 return true; 1633 } 1634} 1635 1636static const char* user_assertion_options[] = { 1637 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1638}; 1639 1640static const char* system_assertion_options[] = { 1641 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1642}; 1643 1644// Return true if any of the strings in null-terminated array 'names' matches. 1645// If tail_allowed is true, then the tail must begin with a colon; otherwise, 1646// the option must match exactly. 1647static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 1648 bool tail_allowed) { 1649 for (/* empty */; *names != NULL; ++names) { 1650 if (match_option(option, *names, tail)) { 1651 if (**tail == '\0' || tail_allowed && **tail == ':') { 1652 return true; 1653 } 1654 } 1655 } 1656 return false; 1657} 1658 1659Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1660 jlong* long_arg, 1661 jlong min_size) { 1662 if (!atomll(s, long_arg)) return arg_unreadable; 1663 return check_memory_size(*long_arg, min_size); 1664} 1665 1666// Parse JavaVMInitArgs structure 1667 1668jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 1669 // For components of the system classpath. 1670 SysClassPath scp(Arguments::get_sysclasspath()); 1671 bool scp_assembly_required = false; 1672 1673 // Save default settings for some mode flags 1674 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1675 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1676 Arguments::_ClipInlining = ClipInlining; 1677 Arguments::_BackgroundCompilation = BackgroundCompilation; 1678 Arguments::_Tier2CompileThreshold = Tier2CompileThreshold; 1679 1680 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 1681 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 1682 if (result != JNI_OK) { 1683 return result; 1684 } 1685 1686 // Parse JavaVMInitArgs structure passed in 1687 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 1688 if (result != JNI_OK) { 1689 return result; 1690 } 1691 1692 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 1693 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 1694 if (result != JNI_OK) { 1695 return result; 1696 } 1697 1698 // Do final processing now that all arguments have been parsed 1699 result = finalize_vm_init_args(&scp, scp_assembly_required); 1700 if (result != JNI_OK) { 1701 return result; 1702 } 1703 1704 return JNI_OK; 1705} 1706 1707 1708jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 1709 SysClassPath* scp_p, 1710 bool* scp_assembly_required_p, 1711 FlagValueOrigin origin) { 1712 // Remaining part of option string 1713 const char* tail; 1714 1715 // iterate over arguments 1716 for (int index = 0; index < args->nOptions; index++) { 1717 bool is_absolute_path = false; // for -agentpath vs -agentlib 1718 1719 const JavaVMOption* option = args->options + index; 1720 1721 if (!match_option(option, "-Djava.class.path", &tail) && 1722 !match_option(option, "-Dsun.java.command", &tail) && 1723 !match_option(option, "-Dsun.java.launcher", &tail)) { 1724 1725 // add all jvm options to the jvm_args string. This string 1726 // is used later to set the java.vm.args PerfData string constant. 1727 // the -Djava.class.path and the -Dsun.java.command options are 1728 // omitted from jvm_args string as each have their own PerfData 1729 // string constant object. 1730 build_jvm_args(option->optionString); 1731 } 1732 1733 // -verbose:[class/gc/jni] 1734 if (match_option(option, "-verbose", &tail)) { 1735 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 1736 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 1737 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 1738 } else if (!strcmp(tail, ":gc")) { 1739 FLAG_SET_CMDLINE(bool, PrintGC, true); 1740 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 1741 } else if (!strcmp(tail, ":jni")) { 1742 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 1743 } 1744 // -da / -ea / -disableassertions / -enableassertions 1745 // These accept an optional class/package name separated by a colon, e.g., 1746 // -da:java.lang.Thread. 1747 } else if (match_option(option, user_assertion_options, &tail, true)) { 1748 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 1749 if (*tail == '\0') { 1750 JavaAssertions::setUserClassDefault(enable); 1751 } else { 1752 assert(*tail == ':', "bogus match by match_option()"); 1753 JavaAssertions::addOption(tail + 1, enable); 1754 } 1755 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 1756 } else if (match_option(option, system_assertion_options, &tail, false)) { 1757 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 1758 JavaAssertions::setSystemClassDefault(enable); 1759 // -bootclasspath: 1760 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 1761 scp_p->reset_path(tail); 1762 *scp_assembly_required_p = true; 1763 // -bootclasspath/a: 1764 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 1765 scp_p->add_suffix(tail); 1766 *scp_assembly_required_p = true; 1767 // -bootclasspath/p: 1768 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 1769 scp_p->add_prefix(tail); 1770 *scp_assembly_required_p = true; 1771 // -Xrun 1772 } else if (match_option(option, "-Xrun", &tail)) { 1773 if(tail != NULL) { 1774 const char* pos = strchr(tail, ':'); 1775 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 1776 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 1777 name[len] = '\0'; 1778 1779 char *options = NULL; 1780 if(pos != NULL) { 1781 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 1782 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 1783 } 1784#ifdef JVMTI_KERNEL 1785 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 1786 warning("profiling and debugging agents are not supported with Kernel VM"); 1787 } else 1788#endif // JVMTI_KERNEL 1789 add_init_library(name, options); 1790 } 1791 // -agentlib and -agentpath 1792 } else if (match_option(option, "-agentlib:", &tail) || 1793 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 1794 if(tail != NULL) { 1795 const char* pos = strchr(tail, '='); 1796 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 1797 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 1798 name[len] = '\0'; 1799 1800 char *options = NULL; 1801 if(pos != NULL) { 1802 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 1803 } 1804#ifdef JVMTI_KERNEL 1805 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 1806 warning("profiling and debugging agents are not supported with Kernel VM"); 1807 } else 1808#endif // JVMTI_KERNEL 1809 add_init_agent(name, options, is_absolute_path); 1810 1811 } 1812 // -javaagent 1813 } else if (match_option(option, "-javaagent:", &tail)) { 1814 if(tail != NULL) { 1815 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 1816 add_init_agent("instrument", options, false); 1817 } 1818 // -Xnoclassgc 1819 } else if (match_option(option, "-Xnoclassgc", &tail)) { 1820 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 1821 // -Xincgc: i-CMS 1822 } else if (match_option(option, "-Xincgc", &tail)) { 1823 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 1824 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 1825 // -Xnoincgc: no i-CMS 1826 } else if (match_option(option, "-Xnoincgc", &tail)) { 1827 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 1828 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 1829 // -Xconcgc 1830 } else if (match_option(option, "-Xconcgc", &tail)) { 1831 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 1832 // -Xnoconcgc 1833 } else if (match_option(option, "-Xnoconcgc", &tail)) { 1834 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 1835 // -Xbatch 1836 } else if (match_option(option, "-Xbatch", &tail)) { 1837 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 1838 // -Xmn for compatibility with other JVM vendors 1839 } else if (match_option(option, "-Xmn", &tail)) { 1840 jlong long_initial_eden_size = 0; 1841 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 1842 if (errcode != arg_in_range) { 1843 jio_fprintf(defaultStream::error_stream(), 1844 "Invalid initial eden size: %s\n", option->optionString); 1845 describe_range_error(errcode); 1846 return JNI_EINVAL; 1847 } 1848 FLAG_SET_CMDLINE(uintx, MaxNewSize, (size_t) long_initial_eden_size); 1849 FLAG_SET_CMDLINE(uintx, NewSize, (size_t) long_initial_eden_size); 1850 // -Xms 1851 } else if (match_option(option, "-Xms", &tail)) { 1852 jlong long_initial_heap_size = 0; 1853 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 1854 if (errcode != arg_in_range) { 1855 jio_fprintf(defaultStream::error_stream(), 1856 "Invalid initial heap size: %s\n", option->optionString); 1857 describe_range_error(errcode); 1858 return JNI_EINVAL; 1859 } 1860 set_initial_heap_size((size_t) long_initial_heap_size); 1861 // Currently the minimum size and the initial heap sizes are the same. 1862 set_min_heap_size(initial_heap_size()); 1863 // -Xmx 1864 } else if (match_option(option, "-Xmx", &tail)) { 1865 jlong long_max_heap_size = 0; 1866 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 1867 if (errcode != arg_in_range) { 1868 jio_fprintf(defaultStream::error_stream(), 1869 "Invalid maximum heap size: %s\n", option->optionString); 1870 describe_range_error(errcode); 1871 return JNI_EINVAL; 1872 } 1873 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (size_t) long_max_heap_size); 1874 // Xmaxf 1875 } else if (match_option(option, "-Xmaxf", &tail)) { 1876 int maxf = (int)(atof(tail) * 100); 1877 if (maxf < 0 || maxf > 100) { 1878 jio_fprintf(defaultStream::error_stream(), 1879 "Bad max heap free percentage size: %s\n", 1880 option->optionString); 1881 return JNI_EINVAL; 1882 } else { 1883 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 1884 } 1885 // Xminf 1886 } else if (match_option(option, "-Xminf", &tail)) { 1887 int minf = (int)(atof(tail) * 100); 1888 if (minf < 0 || minf > 100) { 1889 jio_fprintf(defaultStream::error_stream(), 1890 "Bad min heap free percentage size: %s\n", 1891 option->optionString); 1892 return JNI_EINVAL; 1893 } else { 1894 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 1895 } 1896 // -Xss 1897 } else if (match_option(option, "-Xss", &tail)) { 1898 jlong long_ThreadStackSize = 0; 1899 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 1900 if (errcode != arg_in_range) { 1901 jio_fprintf(defaultStream::error_stream(), 1902 "Invalid thread stack size: %s\n", option->optionString); 1903 describe_range_error(errcode); 1904 return JNI_EINVAL; 1905 } 1906 // Internally track ThreadStackSize in units of 1024 bytes. 1907 FLAG_SET_CMDLINE(intx, ThreadStackSize, 1908 round_to((int)long_ThreadStackSize, K) / K); 1909 // -Xoss 1910 } else if (match_option(option, "-Xoss", &tail)) { 1911 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 1912 // -Xmaxjitcodesize 1913 } else if (match_option(option, "-Xmaxjitcodesize", &tail)) { 1914 jlong long_ReservedCodeCacheSize = 0; 1915 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1916 InitialCodeCacheSize); 1917 if (errcode != arg_in_range) { 1918 jio_fprintf(defaultStream::error_stream(), 1919 "Invalid maximum code cache size: %s\n", 1920 option->optionString); 1921 describe_range_error(errcode); 1922 return JNI_EINVAL; 1923 } 1924 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 1925 // -green 1926 } else if (match_option(option, "-green", &tail)) { 1927 jio_fprintf(defaultStream::error_stream(), 1928 "Green threads support not available\n"); 1929 return JNI_EINVAL; 1930 // -native 1931 } else if (match_option(option, "-native", &tail)) { 1932 // HotSpot always uses native threads, ignore silently for compatibility 1933 // -Xsqnopause 1934 } else if (match_option(option, "-Xsqnopause", &tail)) { 1935 // EVM option, ignore silently for compatibility 1936 // -Xrs 1937 } else if (match_option(option, "-Xrs", &tail)) { 1938 // Classic/EVM option, new functionality 1939 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 1940 } else if (match_option(option, "-Xusealtsigs", &tail)) { 1941 // change default internal VM signals used - lower case for back compat 1942 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 1943 // -Xoptimize 1944 } else if (match_option(option, "-Xoptimize", &tail)) { 1945 // EVM option, ignore silently for compatibility 1946 // -Xprof 1947 } else if (match_option(option, "-Xprof", &tail)) { 1948#ifndef FPROF_KERNEL 1949 _has_profile = true; 1950#else // FPROF_KERNEL 1951 // do we have to exit? 1952 warning("Kernel VM does not support flat profiling."); 1953#endif // FPROF_KERNEL 1954 // -Xaprof 1955 } else if (match_option(option, "-Xaprof", &tail)) { 1956 _has_alloc_profile = true; 1957 // -Xconcurrentio 1958 } else if (match_option(option, "-Xconcurrentio", &tail)) { 1959 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 1960 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 1961 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 1962 FLAG_SET_CMDLINE(bool, UseTLAB, false); 1963 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 1964 1965 // -Xinternalversion 1966 } else if (match_option(option, "-Xinternalversion", &tail)) { 1967 jio_fprintf(defaultStream::output_stream(), "%s\n", 1968 VM_Version::internal_vm_info_string()); 1969 vm_exit(0); 1970#ifndef PRODUCT 1971 // -Xprintflags 1972 } else if (match_option(option, "-Xprintflags", &tail)) { 1973 CommandLineFlags::printFlags(); 1974 vm_exit(0); 1975#endif 1976 // -D 1977 } else if (match_option(option, "-D", &tail)) { 1978 if (!add_property(tail)) { 1979 return JNI_ENOMEM; 1980 } 1981 // Out of the box management support 1982 if (match_option(option, "-Dcom.sun.management", &tail)) { 1983 FLAG_SET_CMDLINE(bool, ManagementServer, true); 1984 } 1985 // -Xint 1986 } else if (match_option(option, "-Xint", &tail)) { 1987 set_mode_flags(_int); 1988 // -Xmixed 1989 } else if (match_option(option, "-Xmixed", &tail)) { 1990 set_mode_flags(_mixed); 1991 // -Xcomp 1992 } else if (match_option(option, "-Xcomp", &tail)) { 1993 // for testing the compiler; turn off all flags that inhibit compilation 1994 set_mode_flags(_comp); 1995 1996 // -Xshare:dump 1997 } else if (match_option(option, "-Xshare:dump", &tail)) { 1998#ifdef TIERED 1999 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2000 set_mode_flags(_int); // Prevent compilation, which creates objects 2001#elif defined(COMPILER2) 2002 vm_exit_during_initialization( 2003 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2004#elif defined(KERNEL) 2005 vm_exit_during_initialization( 2006 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2007#else 2008 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2009 set_mode_flags(_int); // Prevent compilation, which creates objects 2010#endif 2011 // -Xshare:on 2012 } else if (match_option(option, "-Xshare:on", &tail)) { 2013 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2014 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2015#ifdef TIERED 2016 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true); 2017#endif // TIERED 2018 // -Xshare:auto 2019 } else if (match_option(option, "-Xshare:auto", &tail)) { 2020 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2021 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2022 // -Xshare:off 2023 } else if (match_option(option, "-Xshare:off", &tail)) { 2024 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2025 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2026 2027 // -Xverify 2028 } else if (match_option(option, "-Xverify", &tail)) { 2029 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2030 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2031 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2032 } else if (strcmp(tail, ":remote") == 0) { 2033 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2034 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2035 } else if (strcmp(tail, ":none") == 0) { 2036 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2037 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2038 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2039 return JNI_EINVAL; 2040 } 2041 // -Xdebug 2042 } else if (match_option(option, "-Xdebug", &tail)) { 2043 // note this flag has been used, then ignore 2044 set_xdebug_mode(true); 2045 // -Xnoagent 2046 } else if (match_option(option, "-Xnoagent", &tail)) { 2047 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2048 } else if (match_option(option, "-Xboundthreads", &tail)) { 2049 // Bind user level threads to kernel threads (Solaris only) 2050 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2051 } else if (match_option(option, "-Xloggc:", &tail)) { 2052 // Redirect GC output to the file. -Xloggc:<filename> 2053 // ostream_init_log(), when called will use this filename 2054 // to initialize a fileStream. 2055 _gc_log_filename = strdup(tail); 2056 FLAG_SET_CMDLINE(bool, PrintGC, true); 2057 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2058 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2059 2060 // JNI hooks 2061 } else if (match_option(option, "-Xcheck", &tail)) { 2062 if (!strcmp(tail, ":jni")) { 2063 CheckJNICalls = true; 2064 } else if (is_bad_option(option, args->ignoreUnrecognized, 2065 "check")) { 2066 return JNI_EINVAL; 2067 } 2068 } else if (match_option(option, "vfprintf", &tail)) { 2069 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2070 } else if (match_option(option, "exit", &tail)) { 2071 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2072 } else if (match_option(option, "abort", &tail)) { 2073 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2074 // -XX:+AggressiveHeap 2075 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2076 2077 // This option inspects the machine and attempts to set various 2078 // parameters to be optimal for long-running, memory allocation 2079 // intensive jobs. It is intended for machines with large 2080 // amounts of cpu and memory. 2081 2082 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2083 // VM, but we may not be able to represent the total physical memory 2084 // available (like having 8gb of memory on a box but using a 32bit VM). 2085 // Thus, we need to make sure we're using a julong for intermediate 2086 // calculations. 2087 julong initHeapSize; 2088 julong total_memory = os::physical_memory(); 2089 2090 if (total_memory < (julong)256*M) { 2091 jio_fprintf(defaultStream::error_stream(), 2092 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2093 vm_exit(1); 2094 } 2095 2096 // The heap size is half of available memory, or (at most) 2097 // all of possible memory less 160mb (leaving room for the OS 2098 // when using ISM). This is the maximum; because adaptive sizing 2099 // is turned on below, the actual space used may be smaller. 2100 2101 initHeapSize = MIN2(total_memory / (julong)2, 2102 total_memory - (julong)160*M); 2103 2104 // Make sure that if we have a lot of memory we cap the 32 bit 2105 // process space. The 64bit VM version of this function is a nop. 2106 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2107 2108 // The perm gen is separate but contiguous with the 2109 // object heap (and is reserved with it) so subtract it 2110 // from the heap size. 2111 if (initHeapSize > MaxPermSize) { 2112 initHeapSize = initHeapSize - MaxPermSize; 2113 } else { 2114 warning("AggressiveHeap and MaxPermSize values may conflict"); 2115 } 2116 2117 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2118 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2119 set_initial_heap_size(MaxHeapSize); 2120 // Currently the minimum size and the initial heap sizes are the same. 2121 set_min_heap_size(initial_heap_size()); 2122 } 2123 if (FLAG_IS_DEFAULT(NewSize)) { 2124 // Make the young generation 3/8ths of the total heap. 2125 FLAG_SET_CMDLINE(uintx, NewSize, 2126 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2127 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2128 } 2129 2130 FLAG_SET_DEFAULT(UseLargePages, true); 2131 2132 // Increase some data structure sizes for efficiency 2133 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2134 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2135 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2136 2137 // See the OldPLABSize comment below, but replace 'after promotion' 2138 // with 'after copying'. YoungPLABSize is the size of the survivor 2139 // space per-gc-thread buffers. The default is 4kw. 2140 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2141 2142 // OldPLABSize is the size of the buffers in the old gen that 2143 // UseParallelGC uses to promote live data that doesn't fit in the 2144 // survivor spaces. At any given time, there's one for each gc thread. 2145 // The default size is 1kw. These buffers are rarely used, since the 2146 // survivor spaces are usually big enough. For specjbb, however, there 2147 // are occasions when there's lots of live data in the young gen 2148 // and we end up promoting some of it. We don't have a definite 2149 // explanation for why bumping OldPLABSize helps, but the theory 2150 // is that a bigger PLAB results in retaining something like the 2151 // original allocation order after promotion, which improves mutator 2152 // locality. A minor effect may be that larger PLABs reduce the 2153 // number of PLAB allocation events during gc. The value of 8kw 2154 // was arrived at by experimenting with specjbb. 2155 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2156 2157 // CompilationPolicyChoice=0 causes the server compiler to adopt 2158 // a more conservative which-method-do-I-compile policy when one 2159 // of the counters maintained by the interpreter trips. The 2160 // result is reduced startup time and improved specjbb and 2161 // alacrity performance. Zero is the default, but we set it 2162 // explicitly here in case the default changes. 2163 // See runtime/compilationPolicy.*. 2164 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2165 2166 // Enable parallel GC and adaptive generation sizing 2167 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2168 FLAG_SET_DEFAULT(ParallelGCThreads, 2169 Abstract_VM_Version::parallel_worker_threads()); 2170 2171 // Encourage steady state memory management 2172 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2173 2174 // This appears to improve mutator locality 2175 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2176 2177 // Get around early Solaris scheduling bug 2178 // (affinity vs other jobs on system) 2179 // but disallow DR and offlining (5008695). 2180 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2181 2182 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2183 // The last option must always win. 2184 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2185 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2186 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2187 // The last option must always win. 2188 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2189 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2190 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2191 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2192 jio_fprintf(defaultStream::error_stream(), 2193 "Please use CMSClassUnloadingEnabled in place of " 2194 "CMSPermGenSweepingEnabled in the future\n"); 2195 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2196 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2197 jio_fprintf(defaultStream::error_stream(), 2198 "Please use -XX:+UseGCOverheadLimit in place of " 2199 "-XX:+UseGCTimeLimit in the future\n"); 2200 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2201 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2202 jio_fprintf(defaultStream::error_stream(), 2203 "Please use -XX:-UseGCOverheadLimit in place of " 2204 "-XX:-UseGCTimeLimit in the future\n"); 2205 // The TLE options are for compatibility with 1.3 and will be 2206 // removed without notice in a future release. These options 2207 // are not to be documented. 2208 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2209 // No longer used. 2210 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2211 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2212 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2213 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2214 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2215 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2216 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2217 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2218 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2219 // No longer used. 2220 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2221 jlong long_tlab_size = 0; 2222 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2223 if (errcode != arg_in_range) { 2224 jio_fprintf(defaultStream::error_stream(), 2225 "Invalid TLAB size: %s\n", option->optionString); 2226 describe_range_error(errcode); 2227 return JNI_EINVAL; 2228 } 2229 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2230 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2231 // No longer used. 2232 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2233 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2234 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2235 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2236SOLARIS_ONLY( 2237 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2238 warning("-XX:+UsePermISM is obsolete."); 2239 FLAG_SET_CMDLINE(bool, UseISM, true); 2240 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2241 FLAG_SET_CMDLINE(bool, UseISM, false); 2242) 2243 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2244 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2245 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2246 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2247 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2248 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2249 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2250#ifdef SOLARIS 2251 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2252 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2253 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2254 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2255#else // ndef SOLARIS 2256 jio_fprintf(defaultStream::error_stream(), 2257 "ExtendedDTraceProbes flag is only applicable on Solaris\n"); 2258 return JNI_EINVAL; 2259#endif // ndef SOLARIS 2260 } else 2261#ifdef ASSERT 2262 if (match_option(option, "-XX:+FullGCALot", &tail)) { 2263 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2264 // disable scavenge before parallel mark-compact 2265 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2266 } else 2267#endif 2268 if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2269 julong cms_blocks_to_claim = (julong)atol(tail); 2270 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2271 jio_fprintf(defaultStream::error_stream(), 2272 "Please use -XX:CMSParPromoteBlocksToClaim in place of " 2273 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2274 } else 2275 if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2276 jlong old_plab_size = 0; 2277 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2278 if (errcode != arg_in_range) { 2279 jio_fprintf(defaultStream::error_stream(), 2280 "Invalid old PLAB size: %s\n", option->optionString); 2281 describe_range_error(errcode); 2282 return JNI_EINVAL; 2283 } 2284 FLAG_SET_CMDLINE(uintx, OldPLABSize, (julong)old_plab_size); 2285 jio_fprintf(defaultStream::error_stream(), 2286 "Please use -XX:OldPLABSize in place of " 2287 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2288 } else 2289 if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2290 jlong young_plab_size = 0; 2291 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2292 if (errcode != arg_in_range) { 2293 jio_fprintf(defaultStream::error_stream(), 2294 "Invalid young PLAB size: %s\n", option->optionString); 2295 describe_range_error(errcode); 2296 return JNI_EINVAL; 2297 } 2298 FLAG_SET_CMDLINE(uintx, YoungPLABSize, (julong)young_plab_size); 2299 jio_fprintf(defaultStream::error_stream(), 2300 "Please use -XX:YoungPLABSize in place of " 2301 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2302 } else 2303 if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2304 // Skip -XX:Flags= since that case has already been handled 2305 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2306 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2307 return JNI_EINVAL; 2308 } 2309 } 2310 // Unknown option 2311 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2312 return JNI_ERR; 2313 } 2314 } 2315 2316 return JNI_OK; 2317} 2318 2319jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2320 // This must be done after all -D arguments have been processed. 2321 scp_p->expand_endorsed(); 2322 2323 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2324 // Assemble the bootclasspath elements into the final path. 2325 Arguments::set_sysclasspath(scp_p->combined_path()); 2326 } 2327 2328 // This must be done after all arguments have been processed. 2329 // java_compiler() true means set to "NONE" or empty. 2330 if (java_compiler() && !xdebug_mode()) { 2331 // For backwards compatibility, we switch to interpreted mode if 2332 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2333 // not specified. 2334 set_mode_flags(_int); 2335 } 2336 if (CompileThreshold == 0) { 2337 set_mode_flags(_int); 2338 } 2339 2340#ifdef TIERED 2341 // If we are using tiered compilation in the tiered vm then c1 will 2342 // do the profiling and we don't want to waste that time in the 2343 // interpreter. 2344 if (TieredCompilation) { 2345 ProfileInterpreter = false; 2346 } else { 2347 // Since we are running vanilla server we must adjust the compile threshold 2348 // unless the user has already adjusted it because the default threshold assumes 2349 // we will run tiered. 2350 2351 if (FLAG_IS_DEFAULT(CompileThreshold)) { 2352 CompileThreshold = Tier2CompileThreshold; 2353 } 2354 } 2355#endif // TIERED 2356 2357#ifndef COMPILER2 2358 // Don't degrade server performance for footprint 2359 if (FLAG_IS_DEFAULT(UseLargePages) && 2360 MaxHeapSize < LargePageHeapSizeThreshold) { 2361 // No need for large granularity pages w/small heaps. 2362 // Note that large pages are enabled/disabled for both the 2363 // Java heap and the code cache. 2364 FLAG_SET_DEFAULT(UseLargePages, false); 2365 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2366 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2367 } 2368 2369#else 2370 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2371 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2372 } 2373 // Temporary disable bulk zeroing reduction with G1. See CR 6627983. 2374 if (UseG1GC) { 2375 FLAG_SET_DEFAULT(ReduceBulkZeroing, false); 2376 } 2377#endif 2378 2379 if (!check_vm_args_consistency()) { 2380 return JNI_ERR; 2381 } 2382 2383 return JNI_OK; 2384} 2385 2386jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2387 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2388 scp_assembly_required_p); 2389} 2390 2391jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2392 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2393 scp_assembly_required_p); 2394} 2395 2396jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2397 const int N_MAX_OPTIONS = 64; 2398 const int OPTION_BUFFER_SIZE = 1024; 2399 char buffer[OPTION_BUFFER_SIZE]; 2400 2401 // The variable will be ignored if it exceeds the length of the buffer. 2402 // Don't check this variable if user has special privileges 2403 // (e.g. unix su command). 2404 if (os::getenv(name, buffer, sizeof(buffer)) && 2405 !os::have_special_privileges()) { 2406 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2407 jio_fprintf(defaultStream::error_stream(), 2408 "Picked up %s: %s\n", name, buffer); 2409 char* rd = buffer; // pointer to the input string (rd) 2410 int i; 2411 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2412 while (isspace(*rd)) rd++; // skip whitespace 2413 if (*rd == 0) break; // we re done when the input string is read completely 2414 2415 // The output, option string, overwrites the input string. 2416 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2417 // input string (rd). 2418 char* wrt = rd; 2419 2420 options[i++].optionString = wrt; // Fill in option 2421 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2422 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2423 int quote = *rd; // matching quote to look for 2424 rd++; // don't copy open quote 2425 while (*rd != quote) { // include everything (even spaces) up until quote 2426 if (*rd == 0) { // string termination means unmatched string 2427 jio_fprintf(defaultStream::error_stream(), 2428 "Unmatched quote in %s\n", name); 2429 return JNI_ERR; 2430 } 2431 *wrt++ = *rd++; // copy to option string 2432 } 2433 rd++; // don't copy close quote 2434 } else { 2435 *wrt++ = *rd++; // copy to option string 2436 } 2437 } 2438 // Need to check if we're done before writing a NULL, 2439 // because the write could be to the byte that rd is pointing to. 2440 if (*rd++ == 0) { 2441 *wrt = 0; 2442 break; 2443 } 2444 *wrt = 0; // Zero terminate option 2445 } 2446 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2447 JavaVMInitArgs vm_args; 2448 vm_args.version = JNI_VERSION_1_2; 2449 vm_args.options = options; 2450 vm_args.nOptions = i; 2451 vm_args.ignoreUnrecognized = false; 2452 2453 if (PrintVMOptions) { 2454 const char* tail; 2455 for (int i = 0; i < vm_args.nOptions; i++) { 2456 const JavaVMOption *option = vm_args.options + i; 2457 if (match_option(option, "-XX:", &tail)) { 2458 logOption(tail); 2459 } 2460 } 2461 } 2462 2463 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2464 } 2465 return JNI_OK; 2466} 2467 2468// Parse entry point called from JNI_CreateJavaVM 2469 2470jint Arguments::parse(const JavaVMInitArgs* args) { 2471 2472 // Sharing support 2473 // Construct the path to the archive 2474 char jvm_path[JVM_MAXPATHLEN]; 2475 os::jvm_path(jvm_path, sizeof(jvm_path)); 2476#ifdef TIERED 2477 if (strstr(jvm_path, "client") != NULL) { 2478 force_client_mode = true; 2479 } 2480#endif // TIERED 2481 char *end = strrchr(jvm_path, *os::file_separator()); 2482 if (end != NULL) *end = '\0'; 2483 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2484 strlen(os::file_separator()) + 20); 2485 if (shared_archive_path == NULL) return JNI_ENOMEM; 2486 strcpy(shared_archive_path, jvm_path); 2487 strcat(shared_archive_path, os::file_separator()); 2488 strcat(shared_archive_path, "classes"); 2489 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2490 strcat(shared_archive_path, ".jsa"); 2491 SharedArchivePath = shared_archive_path; 2492 2493 // Remaining part of option string 2494 const char* tail; 2495 2496 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2497 bool settings_file_specified = false; 2498 int index; 2499 for (index = 0; index < args->nOptions; index++) { 2500 const JavaVMOption *option = args->options + index; 2501 if (match_option(option, "-XX:Flags=", &tail)) { 2502 if (!process_settings_file(tail, true, args->ignoreUnrecognized)) { 2503 return JNI_EINVAL; 2504 } 2505 settings_file_specified = true; 2506 } 2507 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2508 PrintVMOptions = true; 2509 } 2510 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2511 PrintVMOptions = false; 2512 } 2513 } 2514 2515 // Parse default .hotspotrc settings file 2516 if (!settings_file_specified) { 2517 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 2518 return JNI_EINVAL; 2519 } 2520 } 2521 2522 if (PrintVMOptions) { 2523 for (index = 0; index < args->nOptions; index++) { 2524 const JavaVMOption *option = args->options + index; 2525 if (match_option(option, "-XX:", &tail)) { 2526 logOption(tail); 2527 } 2528 } 2529 } 2530 2531 2532 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 2533 jint result = parse_vm_init_args(args); 2534 if (result != JNI_OK) { 2535 return result; 2536 } 2537 2538 // These are hacks until G1 is fully supported and tested 2539 // but lets you force -XX:+UseG1GC in PRT and get it where it (mostly) works 2540 if (UseG1GC) { 2541 if (UseConcMarkSweepGC || UseParNewGC || UseParallelGC || UseParallelOldGC || UseSerialGC) { 2542#ifndef PRODUCT 2543 tty->print_cr("-XX:+UseG1GC is incompatible with other collectors, using UseG1GC"); 2544#endif // PRODUCT 2545 UseConcMarkSweepGC = false; 2546 UseParNewGC = false; 2547 UseParallelGC = false; 2548 UseParallelOldGC = false; 2549 UseSerialGC = false; 2550 } 2551 no_shared_spaces(); 2552 } 2553 2554#ifndef PRODUCT 2555 if (TraceBytecodesAt != 0) { 2556 TraceBytecodes = true; 2557 } 2558 if (CountCompiledCalls) { 2559 if (UseCounterDecay) { 2560 warning("UseCounterDecay disabled because CountCalls is set"); 2561 UseCounterDecay = false; 2562 } 2563 } 2564#endif // PRODUCT 2565 2566 if (PrintGCDetails) { 2567 // Turn on -verbose:gc options as well 2568 PrintGC = true; 2569 if (FLAG_IS_DEFAULT(TraceClassUnloading)) { 2570 TraceClassUnloading = true; 2571 } 2572 } 2573 2574#ifdef SERIALGC 2575 set_serial_gc_flags(); 2576#endif // SERIALGC 2577#ifdef KERNEL 2578 no_shared_spaces(); 2579#endif // KERNEL 2580 2581 // Set flags based on ergonomics. 2582 set_ergonomics_flags(); 2583 2584 // Check the GC selections again. 2585 if (!check_gc_consistency()) { 2586 return JNI_EINVAL; 2587 } 2588 2589 if (UseParallelGC || UseParallelOldGC) { 2590 // Set some flags for ParallelGC if needed. 2591 set_parallel_gc_flags(); 2592 } else if (UseConcMarkSweepGC) { 2593 // Set some flags for CMS 2594 set_cms_and_parnew_gc_flags(); 2595 } else if (UseParNewGC) { 2596 // Set some flags for ParNew 2597 set_parnew_gc_flags(); 2598 } 2599 // Temporary; make the "if" an "else-if" before 2600 // we integrate G1. XXX 2601 if (UseG1GC) { 2602 // Set some flags for garbage-first, if needed. 2603 set_g1_gc_flags(); 2604 } 2605 2606#ifdef SERIALGC 2607 assert(verify_serial_gc_flags(), "SerialGC unset"); 2608#endif // SERIALGC 2609 2610 // Set bytecode rewriting flags 2611 set_bytecode_flags(); 2612 2613 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 2614 set_aggressive_opts_flags(); 2615 2616#ifdef CC_INTERP 2617 // Biased locking is not implemented with c++ interpreter 2618 FLAG_SET_DEFAULT(UseBiasedLocking, false); 2619#endif /* CC_INTERP */ 2620 2621 if (PrintCommandLineFlags) { 2622 CommandLineFlags::printSetFlags(); 2623 } 2624 2625#ifdef ASSERT 2626 if (PrintFlagsFinal) { 2627 CommandLineFlags::printFlags(); 2628 } 2629#endif 2630 2631 return JNI_OK; 2632} 2633 2634int Arguments::PropertyList_count(SystemProperty* pl) { 2635 int count = 0; 2636 while(pl != NULL) { 2637 count++; 2638 pl = pl->next(); 2639 } 2640 return count; 2641} 2642 2643const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 2644 assert(key != NULL, "just checking"); 2645 SystemProperty* prop; 2646 for (prop = pl; prop != NULL; prop = prop->next()) { 2647 if (strcmp(key, prop->key()) == 0) return prop->value(); 2648 } 2649 return NULL; 2650} 2651 2652const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 2653 int count = 0; 2654 const char* ret_val = NULL; 2655 2656 while(pl != NULL) { 2657 if(count >= index) { 2658 ret_val = pl->key(); 2659 break; 2660 } 2661 count++; 2662 pl = pl->next(); 2663 } 2664 2665 return ret_val; 2666} 2667 2668char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 2669 int count = 0; 2670 char* ret_val = NULL; 2671 2672 while(pl != NULL) { 2673 if(count >= index) { 2674 ret_val = pl->value(); 2675 break; 2676 } 2677 count++; 2678 pl = pl->next(); 2679 } 2680 2681 return ret_val; 2682} 2683 2684void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 2685 SystemProperty* p = *plist; 2686 if (p == NULL) { 2687 *plist = new_p; 2688 } else { 2689 while (p->next() != NULL) { 2690 p = p->next(); 2691 } 2692 p->set_next(new_p); 2693 } 2694} 2695 2696void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 2697 if (plist == NULL) 2698 return; 2699 2700 SystemProperty* new_p = new SystemProperty(k, v, true); 2701 PropertyList_add(plist, new_p); 2702} 2703 2704// This add maintains unique property key in the list. 2705void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v) { 2706 if (plist == NULL) 2707 return; 2708 2709 // If property key exist then update with new value. 2710 SystemProperty* prop; 2711 for (prop = *plist; prop != NULL; prop = prop->next()) { 2712 if (strcmp(k, prop->key()) == 0) { 2713 prop->set_value(v); 2714 return; 2715 } 2716 } 2717 2718 PropertyList_add(plist, k, v); 2719} 2720 2721#ifdef KERNEL 2722char *Arguments::get_kernel_properties() { 2723 // Find properties starting with kernel and append them to string 2724 // We need to find out how long they are first because the URL's that they 2725 // might point to could get long. 2726 int length = 0; 2727 SystemProperty* prop; 2728 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 2729 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 2730 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 2731 } 2732 } 2733 // Add one for null terminator. 2734 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 2735 if (length != 0) { 2736 int pos = 0; 2737 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 2738 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 2739 jio_snprintf(&props[pos], length-pos, 2740 "-D%s=%s ", prop->key(), prop->value()); 2741 pos = strlen(props); 2742 } 2743 } 2744 } 2745 // null terminate props in case of null 2746 props[length] = '\0'; 2747 return props; 2748} 2749#endif // KERNEL 2750 2751// Copies src into buf, replacing "%%" with "%" and "%p" with pid 2752// Returns true if all of the source pointed by src has been copied over to 2753// the destination buffer pointed by buf. Otherwise, returns false. 2754// Notes: 2755// 1. If the length (buflen) of the destination buffer excluding the 2756// NULL terminator character is not long enough for holding the expanded 2757// pid characters, it also returns false instead of returning the partially 2758// expanded one. 2759// 2. The passed in "buflen" should be large enough to hold the null terminator. 2760bool Arguments::copy_expand_pid(const char* src, size_t srclen, 2761 char* buf, size_t buflen) { 2762 const char* p = src; 2763 char* b = buf; 2764 const char* src_end = &src[srclen]; 2765 char* buf_end = &buf[buflen - 1]; 2766 2767 while (p < src_end && b < buf_end) { 2768 if (*p == '%') { 2769 switch (*(++p)) { 2770 case '%': // "%%" ==> "%" 2771 *b++ = *p++; 2772 break; 2773 case 'p': { // "%p" ==> current process id 2774 // buf_end points to the character before the last character so 2775 // that we could write '\0' to the end of the buffer. 2776 size_t buf_sz = buf_end - b + 1; 2777 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 2778 2779 // if jio_snprintf fails or the buffer is not long enough to hold 2780 // the expanded pid, returns false. 2781 if (ret < 0 || ret >= (int)buf_sz) { 2782 return false; 2783 } else { 2784 b += ret; 2785 assert(*b == '\0', "fail in copy_expand_pid"); 2786 if (p == src_end && b == buf_end + 1) { 2787 // reach the end of the buffer. 2788 return true; 2789 } 2790 } 2791 p++; 2792 break; 2793 } 2794 default : 2795 *b++ = '%'; 2796 } 2797 } else { 2798 *b++ = *p++; 2799 } 2800 } 2801 *b = '\0'; 2802 return (p == src_end); // return false if not all of the source was copied 2803} 2804