1 /* 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaAssertions.hpp" 27 #include "compiler/compilerOracle.hpp" 28 #include "memory/allocation.inline.hpp" 29 #include "memory/cardTableRS.hpp" 30 #include "memory/referenceProcessor.hpp" 31 #include "memory/universe.inline.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "prims/jvmtiExport.hpp" 34 #include "runtime/arguments.hpp" 35 #include "runtime/globals_extension.hpp" 36 #include "runtime/java.hpp" 37 #include "services/management.hpp" 38 #include "utilities/defaultStream.hpp" 39 #include "utilities/taskqueue.hpp" 40 #ifdef TARGET_OS_FAMILY_linux 41 # include "os_linux.inline.hpp" 42 #endif 43 #ifdef TARGET_OS_FAMILY_solaris 44 # include "os_solaris.inline.hpp" 45 #endif 46 #ifdef TARGET_OS_FAMILY_windows 47 # include "os_windows.inline.hpp" 48 #endif 49 #ifdef TARGET_OS_FAMILY_bsd 50 # include "os_bsd.inline.hpp" 51 #endif 52 #ifndef SERIALGC 53 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 54 #endif 55 56 // Note: This is a special bug reporting site for the JVM 57 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.sun.com/bugreport/crash.jsp" 58 #define DEFAULT_JAVA_LAUNCHER "generic" 59 60 char** Arguments::_jvm_flags_array = NULL; 61 int Arguments::_num_jvm_flags = 0; 62 char** Arguments::_jvm_args_array = NULL; 63 int Arguments::_num_jvm_args = 0; 64 char* Arguments::_java_command = NULL; 65 SystemProperty* Arguments::_system_properties = NULL; 66 const char* Arguments::_gc_log_filename = NULL; 67 bool Arguments::_has_profile = false; 68 bool Arguments::_has_alloc_profile = false; 69 uintx Arguments::_min_heap_size = 0; 70 Arguments::Mode Arguments::_mode = _mixed; 71 bool Arguments::_java_compiler = false; 72 bool Arguments::_xdebug_mode = false; 73 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 74 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 75 int Arguments::_sun_java_launcher_pid = -1; 76 bool Arguments::_created_by_gamma_launcher = false; 77 78 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 79 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 80 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 81 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 82 bool Arguments::_ClipInlining = ClipInlining; 83 84 char* Arguments::SharedArchivePath = NULL; 85 86 AgentLibraryList Arguments::_libraryList; 87 AgentLibraryList Arguments::_agentList; 88 89 abort_hook_t Arguments::_abort_hook = NULL; 90 exit_hook_t Arguments::_exit_hook = NULL; 91 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 92 93 94 SystemProperty *Arguments::_java_ext_dirs = NULL; 95 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 96 SystemProperty *Arguments::_sun_boot_library_path = NULL; 97 SystemProperty *Arguments::_java_library_path = NULL; 98 SystemProperty *Arguments::_java_home = NULL; 99 SystemProperty *Arguments::_java_class_path = NULL; 100 SystemProperty *Arguments::_sun_boot_class_path = NULL; 101 102 char* Arguments::_meta_index_path = NULL; 103 char* Arguments::_meta_index_dir = NULL; 104 105 static bool force_client_mode = false; 106 107 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 108 109 static bool match_option(const JavaVMOption *option, const char* name, 110 const char** tail) { 111 int len = (int)strlen(name); 112 if (strncmp(option->optionString, name, len) == 0) { 113 *tail = option->optionString + len; 114 return true; 115 } else { 116 return false; 117 } 118 } 119 120 static void logOption(const char* opt) { 121 if (PrintVMOptions) { 122 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 123 } 124 } 125 126 // Process java launcher properties. 127 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 128 // See if sun.java.launcher or sun.java.launcher.pid is defined. 129 // Must do this before setting up other system properties, 130 // as some of them may depend on launcher type. 131 for (int index = 0; index < args->nOptions; index++) { 132 const JavaVMOption* option = args->options + index; 133 const char* tail; 134 135 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 136 process_java_launcher_argument(tail, option->extraInfo); 137 continue; 138 } 139 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 140 _sun_java_launcher_pid = atoi(tail); 141 continue; 142 } 143 } 144 } 145 146 // Initialize system properties key and value. 147 void Arguments::init_system_properties() { 148 149 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 150 "Java Virtual Machine Specification", false)); 151 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 152 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 154 155 // following are JVMTI agent writeable properties. 156 // Properties values are set to NULL and they are 157 // os specific they are initialized in os::init_system_properties_values(). 158 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 159 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 160 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 161 _java_library_path = new SystemProperty("java.library.path", NULL, true); 162 _java_home = new SystemProperty("java.home", NULL, true); 163 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 164 165 _java_class_path = new SystemProperty("java.class.path", "", true); 166 167 // Add to System Property list. 168 PropertyList_add(&_system_properties, _java_ext_dirs); 169 PropertyList_add(&_system_properties, _java_endorsed_dirs); 170 PropertyList_add(&_system_properties, _sun_boot_library_path); 171 PropertyList_add(&_system_properties, _java_library_path); 172 PropertyList_add(&_system_properties, _java_home); 173 PropertyList_add(&_system_properties, _java_class_path); 174 PropertyList_add(&_system_properties, _sun_boot_class_path); 175 176 // Set OS specific system properties values 177 os::init_system_properties_values(); 178 } 179 180 181 // Update/Initialize System properties after JDK version number is known 182 void Arguments::init_version_specific_system_properties() { 183 enum { bufsz = 16 }; 184 char buffer[bufsz]; 185 const char* spec_vendor = "Sun Microsystems Inc."; 186 uint32_t spec_version = 0; 187 188 if (JDK_Version::is_gte_jdk17x_version()) { 189 spec_vendor = "Oracle Corporation"; 190 spec_version = JDK_Version::current().major_version(); 191 } 192 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 193 194 PropertyList_add(&_system_properties, 195 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 196 PropertyList_add(&_system_properties, 197 new SystemProperty("java.vm.specification.version", buffer, false)); 198 PropertyList_add(&_system_properties, 199 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 200 } 201 202 /** 203 * Provide a slightly more user-friendly way of eliminating -XX flags. 204 * When a flag is eliminated, it can be added to this list in order to 205 * continue accepting this flag on the command-line, while issuing a warning 206 * and ignoring the value. Once the JDK version reaches the 'accept_until' 207 * limit, we flatly refuse to admit the existence of the flag. This allows 208 * a flag to die correctly over JDK releases using HSX. 209 */ 210 typedef struct { 211 const char* name; 212 JDK_Version obsoleted_in; // when the flag went away 213 JDK_Version accept_until; // which version to start denying the existence 214 } ObsoleteFlag; 215 216 static ObsoleteFlag obsolete_jvm_flags[] = { 217 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 218 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 219 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 220 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 221 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 231 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 232 { "DefaultInitialRAMFraction", 233 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 234 { "UseDepthFirstScavengeOrder", 235 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 236 { "HandlePromotionFailure", 237 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 238 { "MaxLiveObjectEvacuationRatio", 239 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 240 { "ForceSharedSpaces", JDK_Version::jdk_update(6,25), JDK_Version::jdk(8) }, 241 { "UseParallelOldGCCompacting", 242 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 243 { "UseParallelDensePrefixUpdate", 244 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 245 { "UseParallelOldGCDensePrefix", 246 JDK_Version::jdk_update(6,27), JDK_Version::jdk(8) }, 247 { "AllowTransitionalJSR292", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 248 { "UseCompressedStrings", JDK_Version::jdk(7), JDK_Version::jdk(8) }, 249 #ifdef PRODUCT 250 { "DesiredMethodLimit", 251 JDK_Version::jdk_update(7, 2), JDK_Version::jdk(8) }, 252 #endif // PRODUCT 253 { NULL, JDK_Version(0), JDK_Version(0) } 254 }; 255 256 // Returns true if the flag is obsolete and fits into the range specified 257 // for being ignored. In the case that the flag is ignored, the 'version' 258 // value is filled in with the version number when the flag became 259 // obsolete so that that value can be displayed to the user. 260 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 261 int i = 0; 262 assert(version != NULL, "Must provide a version buffer"); 263 while (obsolete_jvm_flags[i].name != NULL) { 264 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 265 // <flag>=xxx form 266 // [-|+]<flag> form 267 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 268 ((s[0] == '+' || s[0] == '-') && 269 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 270 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 271 *version = flag_status.obsoleted_in; 272 return true; 273 } 274 } 275 i++; 276 } 277 return false; 278 } 279 280 // Constructs the system class path (aka boot class path) from the following 281 // components, in order: 282 // 283 // prefix // from -Xbootclasspath/p:... 284 // endorsed // the expansion of -Djava.endorsed.dirs=... 285 // base // from os::get_system_properties() or -Xbootclasspath= 286 // suffix // from -Xbootclasspath/a:... 287 // 288 // java.endorsed.dirs is a list of directories; any jar or zip files in the 289 // directories are added to the sysclasspath just before the base. 290 // 291 // This could be AllStatic, but it isn't needed after argument processing is 292 // complete. 293 class SysClassPath: public StackObj { 294 public: 295 SysClassPath(const char* base); 296 ~SysClassPath(); 297 298 inline void set_base(const char* base); 299 inline void add_prefix(const char* prefix); 300 inline void add_suffix_to_prefix(const char* suffix); 301 inline void add_suffix(const char* suffix); 302 inline void reset_path(const char* base); 303 304 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 305 // property. Must be called after all command-line arguments have been 306 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 307 // combined_path(). 308 void expand_endorsed(); 309 310 inline const char* get_base() const { return _items[_scp_base]; } 311 inline const char* get_prefix() const { return _items[_scp_prefix]; } 312 inline const char* get_suffix() const { return _items[_scp_suffix]; } 313 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 314 315 // Combine all the components into a single c-heap-allocated string; caller 316 // must free the string if/when no longer needed. 317 char* combined_path(); 318 319 private: 320 // Utility routines. 321 static char* add_to_path(const char* path, const char* str, bool prepend); 322 static char* add_jars_to_path(char* path, const char* directory); 323 324 inline void reset_item_at(int index); 325 326 // Array indices for the items that make up the sysclasspath. All except the 327 // base are allocated in the C heap and freed by this class. 328 enum { 329 _scp_prefix, // from -Xbootclasspath/p:... 330 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 331 _scp_base, // the default sysclasspath 332 _scp_suffix, // from -Xbootclasspath/a:... 333 _scp_nitems // the number of items, must be last. 334 }; 335 336 const char* _items[_scp_nitems]; 337 DEBUG_ONLY(bool _expansion_done;) 338 }; 339 340 SysClassPath::SysClassPath(const char* base) { 341 memset(_items, 0, sizeof(_items)); 342 _items[_scp_base] = base; 343 DEBUG_ONLY(_expansion_done = false;) 344 } 345 346 SysClassPath::~SysClassPath() { 347 // Free everything except the base. 348 for (int i = 0; i < _scp_nitems; ++i) { 349 if (i != _scp_base) reset_item_at(i); 350 } 351 DEBUG_ONLY(_expansion_done = false;) 352 } 353 354 inline void SysClassPath::set_base(const char* base) { 355 _items[_scp_base] = base; 356 } 357 358 inline void SysClassPath::add_prefix(const char* prefix) { 359 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 360 } 361 362 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 363 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 364 } 365 366 inline void SysClassPath::add_suffix(const char* suffix) { 367 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 368 } 369 370 inline void SysClassPath::reset_item_at(int index) { 371 assert(index < _scp_nitems && index != _scp_base, "just checking"); 372 if (_items[index] != NULL) { 373 FREE_C_HEAP_ARRAY(char, _items[index]); 374 _items[index] = NULL; 375 } 376 } 377 378 inline void SysClassPath::reset_path(const char* base) { 379 // Clear the prefix and suffix. 380 reset_item_at(_scp_prefix); 381 reset_item_at(_scp_suffix); 382 set_base(base); 383 } 384 385 //------------------------------------------------------------------------------ 386 387 void SysClassPath::expand_endorsed() { 388 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 389 390 const char* path = Arguments::get_property("java.endorsed.dirs"); 391 if (path == NULL) { 392 path = Arguments::get_endorsed_dir(); 393 assert(path != NULL, "no default for java.endorsed.dirs"); 394 } 395 396 char* expanded_path = NULL; 397 const char separator = *os::path_separator(); 398 const char* const end = path + strlen(path); 399 while (path < end) { 400 const char* tmp_end = strchr(path, separator); 401 if (tmp_end == NULL) { 402 expanded_path = add_jars_to_path(expanded_path, path); 403 path = end; 404 } else { 405 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1); 406 memcpy(dirpath, path, tmp_end - path); 407 dirpath[tmp_end - path] = '\0'; 408 expanded_path = add_jars_to_path(expanded_path, dirpath); 409 FREE_C_HEAP_ARRAY(char, dirpath); 410 path = tmp_end + 1; 411 } 412 } 413 _items[_scp_endorsed] = expanded_path; 414 DEBUG_ONLY(_expansion_done = true;) 415 } 416 417 // Combine the bootclasspath elements, some of which may be null, into a single 418 // c-heap-allocated string. 419 char* SysClassPath::combined_path() { 420 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 421 assert(_expansion_done, "must call expand_endorsed() first."); 422 423 size_t lengths[_scp_nitems]; 424 size_t total_len = 0; 425 426 const char separator = *os::path_separator(); 427 428 // Get the lengths. 429 int i; 430 for (i = 0; i < _scp_nitems; ++i) { 431 if (_items[i] != NULL) { 432 lengths[i] = strlen(_items[i]); 433 // Include space for the separator char (or a NULL for the last item). 434 total_len += lengths[i] + 1; 435 } 436 } 437 assert(total_len > 0, "empty sysclasspath not allowed"); 438 439 // Copy the _items to a single string. 440 char* cp = NEW_C_HEAP_ARRAY(char, total_len); 441 char* cp_tmp = cp; 442 for (i = 0; i < _scp_nitems; ++i) { 443 if (_items[i] != NULL) { 444 memcpy(cp_tmp, _items[i], lengths[i]); 445 cp_tmp += lengths[i]; 446 *cp_tmp++ = separator; 447 } 448 } 449 *--cp_tmp = '\0'; // Replace the extra separator. 450 return cp; 451 } 452 453 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 454 char* 455 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 456 char *cp; 457 458 assert(str != NULL, "just checking"); 459 if (path == NULL) { 460 size_t len = strlen(str) + 1; 461 cp = NEW_C_HEAP_ARRAY(char, len); 462 memcpy(cp, str, len); // copy the trailing null 463 } else { 464 const char separator = *os::path_separator(); 465 size_t old_len = strlen(path); 466 size_t str_len = strlen(str); 467 size_t len = old_len + str_len + 2; 468 469 if (prepend) { 470 cp = NEW_C_HEAP_ARRAY(char, len); 471 char* cp_tmp = cp; 472 memcpy(cp_tmp, str, str_len); 473 cp_tmp += str_len; 474 *cp_tmp = separator; 475 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 476 FREE_C_HEAP_ARRAY(char, path); 477 } else { 478 cp = REALLOC_C_HEAP_ARRAY(char, path, len); 479 char* cp_tmp = cp + old_len; 480 *cp_tmp = separator; 481 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 482 } 483 } 484 return cp; 485 } 486 487 // Scan the directory and append any jar or zip files found to path. 488 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 489 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 490 DIR* dir = os::opendir(directory); 491 if (dir == NULL) return path; 492 493 char dir_sep[2] = { '\0', '\0' }; 494 size_t directory_len = strlen(directory); 495 const char fileSep = *os::file_separator(); 496 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 497 498 /* Scan the directory for jars/zips, appending them to path. */ 499 struct dirent *entry; 500 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory)); 501 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 502 const char* name = entry->d_name; 503 const char* ext = name + strlen(name) - 4; 504 bool isJarOrZip = ext > name && 505 (os::file_name_strcmp(ext, ".jar") == 0 || 506 os::file_name_strcmp(ext, ".zip") == 0); 507 if (isJarOrZip) { 508 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name)); 509 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 510 path = add_to_path(path, jarpath, false); 511 FREE_C_HEAP_ARRAY(char, jarpath); 512 } 513 } 514 FREE_C_HEAP_ARRAY(char, dbuf); 515 os::closedir(dir); 516 return path; 517 } 518 519 // Parses a memory size specification string. 520 static bool atomull(const char *s, julong* result) { 521 julong n = 0; 522 int args_read = sscanf(s, os::julong_format_specifier(), &n); 523 if (args_read != 1) { 524 return false; 525 } 526 while (*s != '\0' && isdigit(*s)) { 527 s++; 528 } 529 // 4705540: illegal if more characters are found after the first non-digit 530 if (strlen(s) > 1) { 531 return false; 532 } 533 switch (*s) { 534 case 'T': case 't': 535 *result = n * G * K; 536 // Check for overflow. 537 if (*result/((julong)G * K) != n) return false; 538 return true; 539 case 'G': case 'g': 540 *result = n * G; 541 if (*result/G != n) return false; 542 return true; 543 case 'M': case 'm': 544 *result = n * M; 545 if (*result/M != n) return false; 546 return true; 547 case 'K': case 'k': 548 *result = n * K; 549 if (*result/K != n) return false; 550 return true; 551 case '\0': 552 *result = n; 553 return true; 554 default: 555 return false; 556 } 557 } 558 559 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 560 if (size < min_size) return arg_too_small; 561 // Check that size will fit in a size_t (only relevant on 32-bit) 562 if (size > max_uintx) return arg_too_big; 563 return arg_in_range; 564 } 565 566 // Describe an argument out of range error 567 void Arguments::describe_range_error(ArgsRange errcode) { 568 switch(errcode) { 569 case arg_too_big: 570 jio_fprintf(defaultStream::error_stream(), 571 "The specified size exceeds the maximum " 572 "representable size.\n"); 573 break; 574 case arg_too_small: 575 case arg_unreadable: 576 case arg_in_range: 577 // do nothing for now 578 break; 579 default: 580 ShouldNotReachHere(); 581 } 582 } 583 584 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 585 return CommandLineFlags::boolAtPut(name, &value, origin); 586 } 587 588 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 589 double v; 590 if (sscanf(value, "%lf", &v) != 1) { 591 return false; 592 } 593 594 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 595 return true; 596 } 597 return false; 598 } 599 600 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 601 julong v; 602 intx intx_v; 603 bool is_neg = false; 604 // Check the sign first since atomull() parses only unsigned values. 605 if (*value == '-') { 606 if (!CommandLineFlags::intxAt(name, &intx_v)) { 607 return false; 608 } 609 value++; 610 is_neg = true; 611 } 612 if (!atomull(value, &v)) { 613 return false; 614 } 615 intx_v = (intx) v; 616 if (is_neg) { 617 intx_v = -intx_v; 618 } 619 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 620 return true; 621 } 622 uintx uintx_v = (uintx) v; 623 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 624 return true; 625 } 626 uint64_t uint64_t_v = (uint64_t) v; 627 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 628 return true; 629 } 630 return false; 631 } 632 633 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 634 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 635 // Contract: CommandLineFlags always returns a pointer that needs freeing. 636 FREE_C_HEAP_ARRAY(char, value); 637 return true; 638 } 639 640 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 641 const char* old_value = ""; 642 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 643 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 644 size_t new_len = strlen(new_value); 645 const char* value; 646 char* free_this_too = NULL; 647 if (old_len == 0) { 648 value = new_value; 649 } else if (new_len == 0) { 650 value = old_value; 651 } else { 652 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1); 653 // each new setting adds another LINE to the switch: 654 sprintf(buf, "%s\n%s", old_value, new_value); 655 value = buf; 656 free_this_too = buf; 657 } 658 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 659 // CommandLineFlags always returns a pointer that needs freeing. 660 FREE_C_HEAP_ARRAY(char, value); 661 if (free_this_too != NULL) { 662 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 663 FREE_C_HEAP_ARRAY(char, free_this_too); 664 } 665 return true; 666 } 667 668 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 669 670 // range of acceptable characters spelled out for portability reasons 671 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 672 #define BUFLEN 255 673 char name[BUFLEN+1]; 674 char dummy; 675 676 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 677 return set_bool_flag(name, false, origin); 678 } 679 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 680 return set_bool_flag(name, true, origin); 681 } 682 683 char punct; 684 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 685 const char* value = strchr(arg, '=') + 1; 686 Flag* flag = Flag::find_flag(name, strlen(name)); 687 if (flag != NULL && flag->is_ccstr()) { 688 if (flag->ccstr_accumulates()) { 689 return append_to_string_flag(name, value, origin); 690 } else { 691 if (value[0] == '\0') { 692 value = NULL; 693 } 694 return set_string_flag(name, value, origin); 695 } 696 } 697 } 698 699 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 700 const char* value = strchr(arg, '=') + 1; 701 // -XX:Foo:=xxx will reset the string flag to the given value. 702 if (value[0] == '\0') { 703 value = NULL; 704 } 705 return set_string_flag(name, value, origin); 706 } 707 708 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 709 #define SIGNED_NUMBER_RANGE "[-0123456789]" 710 #define NUMBER_RANGE "[0123456789]" 711 char value[BUFLEN + 1]; 712 char value2[BUFLEN + 1]; 713 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 714 // Looks like a floating-point number -- try again with more lenient format string 715 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 716 return set_fp_numeric_flag(name, value, origin); 717 } 718 } 719 720 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 721 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 722 return set_numeric_flag(name, value, origin); 723 } 724 725 return false; 726 } 727 728 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 729 assert(bldarray != NULL, "illegal argument"); 730 731 if (arg == NULL) { 732 return; 733 } 734 735 int index = *count; 736 737 // expand the array and add arg to the last element 738 (*count)++; 739 if (*bldarray == NULL) { 740 *bldarray = NEW_C_HEAP_ARRAY(char*, *count); 741 } else { 742 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count); 743 } 744 (*bldarray)[index] = strdup(arg); 745 } 746 747 void Arguments::build_jvm_args(const char* arg) { 748 add_string(&_jvm_args_array, &_num_jvm_args, arg); 749 } 750 751 void Arguments::build_jvm_flags(const char* arg) { 752 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 753 } 754 755 // utility function to return a string that concatenates all 756 // strings in a given char** array 757 const char* Arguments::build_resource_string(char** args, int count) { 758 if (args == NULL || count == 0) { 759 return NULL; 760 } 761 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 762 for (int i = 1; i < count; i++) { 763 length += strlen(args[i]) + 1; // add 1 for a space 764 } 765 char* s = NEW_RESOURCE_ARRAY(char, length); 766 strcpy(s, args[0]); 767 for (int j = 1; j < count; j++) { 768 strcat(s, " "); 769 strcat(s, args[j]); 770 } 771 return (const char*) s; 772 } 773 774 void Arguments::print_on(outputStream* st) { 775 st->print_cr("VM Arguments:"); 776 if (num_jvm_flags() > 0) { 777 st->print("jvm_flags: "); print_jvm_flags_on(st); 778 } 779 if (num_jvm_args() > 0) { 780 st->print("jvm_args: "); print_jvm_args_on(st); 781 } 782 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 783 st->print_cr("Launcher Type: %s", _sun_java_launcher); 784 } 785 786 void Arguments::print_jvm_flags_on(outputStream* st) { 787 if (_num_jvm_flags > 0) { 788 for (int i=0; i < _num_jvm_flags; i++) { 789 st->print("%s ", _jvm_flags_array[i]); 790 } 791 st->print_cr(""); 792 } 793 } 794 795 void Arguments::print_jvm_args_on(outputStream* st) { 796 if (_num_jvm_args > 0) { 797 for (int i=0; i < _num_jvm_args; i++) { 798 st->print("%s ", _jvm_args_array[i]); 799 } 800 st->print_cr(""); 801 } 802 } 803 804 bool Arguments::process_argument(const char* arg, 805 jboolean ignore_unrecognized, FlagValueOrigin origin) { 806 807 JDK_Version since = JDK_Version(); 808 809 if (parse_argument(arg, origin) || ignore_unrecognized) { 810 return true; 811 } 812 813 const char * const argname = *arg == '+' || *arg == '-' ? arg + 1 : arg; 814 if (is_newly_obsolete(arg, &since)) { 815 char version[256]; 816 since.to_string(version, sizeof(version)); 817 warning("ignoring option %s; support was removed in %s", argname, version); 818 return true; 819 } 820 821 jio_fprintf(defaultStream::error_stream(), 822 "Unrecognized VM option '%s'\n", argname); 823 // allow for commandline "commenting out" options like -XX:#+Verbose 824 return arg[0] == '#'; 825 } 826 827 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 828 FILE* stream = fopen(file_name, "rb"); 829 if (stream == NULL) { 830 if (should_exist) { 831 jio_fprintf(defaultStream::error_stream(), 832 "Could not open settings file %s\n", file_name); 833 return false; 834 } else { 835 return true; 836 } 837 } 838 839 char token[1024]; 840 int pos = 0; 841 842 bool in_white_space = true; 843 bool in_comment = false; 844 bool in_quote = false; 845 char quote_c = 0; 846 bool result = true; 847 848 int c = getc(stream); 849 while(c != EOF) { 850 if (in_white_space) { 851 if (in_comment) { 852 if (c == '\n') in_comment = false; 853 } else { 854 if (c == '#') in_comment = true; 855 else if (!isspace(c)) { 856 in_white_space = false; 857 token[pos++] = c; 858 } 859 } 860 } else { 861 if (c == '\n' || (!in_quote && isspace(c))) { 862 // token ends at newline, or at unquoted whitespace 863 // this allows a way to include spaces in string-valued options 864 token[pos] = '\0'; 865 logOption(token); 866 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 867 build_jvm_flags(token); 868 pos = 0; 869 in_white_space = true; 870 in_quote = false; 871 } else if (!in_quote && (c == '\'' || c == '"')) { 872 in_quote = true; 873 quote_c = c; 874 } else if (in_quote && (c == quote_c)) { 875 in_quote = false; 876 } else { 877 token[pos++] = c; 878 } 879 } 880 c = getc(stream); 881 } 882 if (pos > 0) { 883 token[pos] = '\0'; 884 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 885 build_jvm_flags(token); 886 } 887 fclose(stream); 888 return result; 889 } 890 891 //============================================================================================================= 892 // Parsing of properties (-D) 893 894 const char* Arguments::get_property(const char* key) { 895 return PropertyList_get_value(system_properties(), key); 896 } 897 898 bool Arguments::add_property(const char* prop) { 899 const char* eq = strchr(prop, '='); 900 char* key; 901 // ns must be static--its address may be stored in a SystemProperty object. 902 const static char ns[1] = {0}; 903 char* value = (char *)ns; 904 905 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 906 key = AllocateHeap(key_len + 1, "add_property"); 907 strncpy(key, prop, key_len); 908 key[key_len] = '\0'; 909 910 if (eq != NULL) { 911 size_t value_len = strlen(prop) - key_len - 1; 912 value = AllocateHeap(value_len + 1, "add_property"); 913 strncpy(value, &prop[key_len + 1], value_len + 1); 914 } 915 916 if (strcmp(key, "java.compiler") == 0) { 917 process_java_compiler_argument(value); 918 FreeHeap(key); 919 if (eq != NULL) { 920 FreeHeap(value); 921 } 922 return true; 923 } else if (strcmp(key, "sun.java.command") == 0) { 924 _java_command = value; 925 926 // Record value in Arguments, but let it get passed to Java. 927 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 928 // launcher.pid property is private and is processed 929 // in process_sun_java_launcher_properties(); 930 // the sun.java.launcher property is passed on to the java application 931 FreeHeap(key); 932 if (eq != NULL) { 933 FreeHeap(value); 934 } 935 return true; 936 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 937 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 938 // its value without going through the property list or making a Java call. 939 _java_vendor_url_bug = value; 940 } else if (strcmp(key, "sun.boot.library.path") == 0) { 941 PropertyList_unique_add(&_system_properties, key, value, true); 942 return true; 943 } 944 // Create new property and add at the end of the list 945 PropertyList_unique_add(&_system_properties, key, value); 946 return true; 947 } 948 949 //=========================================================================================================== 950 // Setting int/mixed/comp mode flags 951 952 void Arguments::set_mode_flags(Mode mode) { 953 // Set up default values for all flags. 954 // If you add a flag to any of the branches below, 955 // add a default value for it here. 956 set_java_compiler(false); 957 _mode = mode; 958 959 // Ensure Agent_OnLoad has the correct initial values. 960 // This may not be the final mode; mode may change later in onload phase. 961 PropertyList_unique_add(&_system_properties, "java.vm.info", 962 (char*)VM_Version::vm_info_string(), false); 963 964 UseInterpreter = true; 965 UseCompiler = true; 966 UseLoopCounter = true; 967 968 #ifndef ZERO 969 // Turn these off for mixed and comp. Leave them on for Zero. 970 if (FLAG_IS_DEFAULT(UseFastAccessorMethods)) { 971 UseFastAccessorMethods = (mode == _int); 972 } 973 if (FLAG_IS_DEFAULT(UseFastEmptyMethods)) { 974 UseFastEmptyMethods = (mode == _int); 975 } 976 #endif 977 978 // Default values may be platform/compiler dependent - 979 // use the saved values 980 ClipInlining = Arguments::_ClipInlining; 981 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 982 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 983 BackgroundCompilation = Arguments::_BackgroundCompilation; 984 985 // Change from defaults based on mode 986 switch (mode) { 987 default: 988 ShouldNotReachHere(); 989 break; 990 case _int: 991 UseCompiler = false; 992 UseLoopCounter = false; 993 AlwaysCompileLoopMethods = false; 994 UseOnStackReplacement = false; 995 break; 996 case _mixed: 997 // same as default 998 break; 999 case _comp: 1000 UseInterpreter = false; 1001 BackgroundCompilation = false; 1002 ClipInlining = false; 1003 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1004 // We will first compile a level 3 version, then do one invocation of it and 1005 // compile a level 4 and then continue executing it. 1006 if (TieredCompilation) { 1007 Tier3InvokeNotifyFreqLog = 0; 1008 Tier4InvocationThreshold = 0; 1009 } 1010 break; 1011 } 1012 } 1013 1014 // Conflict: required to use shared spaces (-Xshare:on), but 1015 // incompatible command line options were chosen. 1016 1017 static void no_shared_spaces() { 1018 if (RequireSharedSpaces) { 1019 jio_fprintf(defaultStream::error_stream(), 1020 "Class data sharing is inconsistent with other specified options.\n"); 1021 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1022 } else { 1023 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1024 } 1025 } 1026 1027 void Arguments::set_tiered_flags() { 1028 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1029 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1030 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1031 } 1032 if (CompilationPolicyChoice < 2) { 1033 vm_exit_during_initialization( 1034 "Incompatible compilation policy selected", NULL); 1035 } 1036 // Increase the code cache size - tiered compiles a lot more. 1037 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1038 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1039 } 1040 } 1041 1042 #ifndef KERNEL 1043 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 1044 // if it's not explictly set or unset. If the user has chosen 1045 // UseParNewGC and not explicitly set ParallelGCThreads we 1046 // set it, unless this is a single cpu machine. 1047 void Arguments::set_parnew_gc_flags() { 1048 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1049 "control point invariant"); 1050 assert(UseParNewGC, "Error"); 1051 1052 // Turn off AdaptiveSizePolicy by default for parnew until it is 1053 // complete. 1054 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1055 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1056 } 1057 1058 if (ParallelGCThreads == 0) { 1059 FLAG_SET_DEFAULT(ParallelGCThreads, 1060 Abstract_VM_Version::parallel_worker_threads()); 1061 if (ParallelGCThreads == 1) { 1062 FLAG_SET_DEFAULT(UseParNewGC, false); 1063 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 1064 } 1065 } 1066 if (UseParNewGC) { 1067 // CDS doesn't work with ParNew yet 1068 no_shared_spaces(); 1069 1070 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1071 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1072 // we set them to 1024 and 1024. 1073 // See CR 6362902. 1074 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1075 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1076 } 1077 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1078 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1079 } 1080 1081 // AlwaysTenure flag should make ParNew promote all at first collection. 1082 // See CR 6362902. 1083 if (AlwaysTenure) { 1084 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 1085 } 1086 // When using compressed oops, we use local overflow stacks, 1087 // rather than using a global overflow list chained through 1088 // the klass word of the object's pre-image. 1089 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1090 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1091 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1092 } 1093 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1094 } 1095 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1096 } 1097 } 1098 1099 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1100 // sparc/solaris for certain applications, but would gain from 1101 // further optimization and tuning efforts, and would almost 1102 // certainly gain from analysis of platform and environment. 1103 void Arguments::set_cms_and_parnew_gc_flags() { 1104 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1105 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1106 1107 // If we are using CMS, we prefer to UseParNewGC, 1108 // unless explicitly forbidden. 1109 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1110 FLAG_SET_ERGO(bool, UseParNewGC, true); 1111 } 1112 1113 // Turn off AdaptiveSizePolicy by default for cms until it is 1114 // complete. 1115 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1116 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1117 } 1118 1119 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1120 // as needed. 1121 if (UseParNewGC) { 1122 set_parnew_gc_flags(); 1123 } 1124 1125 // MaxHeapSize is aligned down in collectorPolicy 1126 size_t max_heap = align_size_down(MaxHeapSize, 1127 CardTableRS::ct_max_alignment_constraint()); 1128 1129 // Now make adjustments for CMS 1130 intx tenuring_default = (intx)6; 1131 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1132 1133 // Preferred young gen size for "short" pauses: 1134 // upper bound depends on # of threads and NewRatio. 1135 const uintx parallel_gc_threads = 1136 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1137 const size_t preferred_max_new_size_unaligned = 1138 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * parallel_gc_threads)); 1139 size_t preferred_max_new_size = 1140 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1141 1142 // Unless explicitly requested otherwise, size young gen 1143 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1144 1145 // If either MaxNewSize or NewRatio is set on the command line, 1146 // assume the user is trying to set the size of the young gen. 1147 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1148 1149 // Set MaxNewSize to our calculated preferred_max_new_size unless 1150 // NewSize was set on the command line and it is larger than 1151 // preferred_max_new_size. 1152 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1153 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1154 } else { 1155 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1156 } 1157 if (PrintGCDetails && Verbose) { 1158 // Too early to use gclog_or_tty 1159 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1160 } 1161 1162 // Code along this path potentially sets NewSize and OldSize 1163 1164 assert(max_heap >= InitialHeapSize, "Error"); 1165 assert(max_heap >= NewSize, "Error"); 1166 1167 if (PrintGCDetails && Verbose) { 1168 // Too early to use gclog_or_tty 1169 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1170 " initial_heap_size: " SIZE_FORMAT 1171 " max_heap: " SIZE_FORMAT, 1172 min_heap_size(), InitialHeapSize, max_heap); 1173 } 1174 size_t min_new = preferred_max_new_size; 1175 if (FLAG_IS_CMDLINE(NewSize)) { 1176 min_new = NewSize; 1177 } 1178 if (max_heap > min_new && min_heap_size() > min_new) { 1179 // Unless explicitly requested otherwise, make young gen 1180 // at least min_new, and at most preferred_max_new_size. 1181 if (FLAG_IS_DEFAULT(NewSize)) { 1182 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1183 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1184 if (PrintGCDetails && Verbose) { 1185 // Too early to use gclog_or_tty 1186 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1187 } 1188 } 1189 // Unless explicitly requested otherwise, size old gen 1190 // so it's NewRatio x of NewSize. 1191 if (FLAG_IS_DEFAULT(OldSize)) { 1192 if (max_heap > NewSize) { 1193 FLAG_SET_ERGO(uintx, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1194 if (PrintGCDetails && Verbose) { 1195 // Too early to use gclog_or_tty 1196 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1197 } 1198 } 1199 } 1200 } 1201 } 1202 // Unless explicitly requested otherwise, definitely 1203 // promote all objects surviving "tenuring_default" scavenges. 1204 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1205 FLAG_IS_DEFAULT(SurvivorRatio)) { 1206 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1207 } 1208 // If we decided above (or user explicitly requested) 1209 // `promote all' (via MaxTenuringThreshold := 0), 1210 // prefer minuscule survivor spaces so as not to waste 1211 // space for (non-existent) survivors 1212 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1213 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1214 } 1215 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1216 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1217 // This is done in order to make ParNew+CMS configuration to work 1218 // with YoungPLABSize and OldPLABSize options. 1219 // See CR 6362902. 1220 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1221 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1222 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1223 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1224 // the value (either from the command line or ergonomics) of 1225 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1226 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1227 } else { 1228 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1229 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1230 // we'll let it to take precedence. 1231 jio_fprintf(defaultStream::error_stream(), 1232 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1233 " options are specified for the CMS collector." 1234 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1235 } 1236 } 1237 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1238 // OldPLAB sizing manually turned off: Use a larger default setting, 1239 // unless it was manually specified. This is because a too-low value 1240 // will slow down scavenges. 1241 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1242 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1243 } 1244 } 1245 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1246 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1247 // If either of the static initialization defaults have changed, note this 1248 // modification. 1249 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1250 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1251 } 1252 if (PrintGCDetails && Verbose) { 1253 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1254 MarkStackSize / K, MarkStackSizeMax / K); 1255 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1256 } 1257 } 1258 #endif // KERNEL 1259 1260 void set_object_alignment() { 1261 // Object alignment. 1262 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1263 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1264 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1265 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1266 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1267 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1268 1269 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1270 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1271 1272 // Oop encoding heap max 1273 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1274 1275 #ifndef KERNEL 1276 // Set CMS global values 1277 CompactibleFreeListSpace::set_cms_values(); 1278 #endif // KERNEL 1279 } 1280 1281 bool verify_object_alignment() { 1282 // Object alignment. 1283 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1284 jio_fprintf(defaultStream::error_stream(), 1285 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1286 (int)ObjectAlignmentInBytes); 1287 return false; 1288 } 1289 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1290 jio_fprintf(defaultStream::error_stream(), 1291 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1292 (int)ObjectAlignmentInBytes, BytesPerLong); 1293 return false; 1294 } 1295 // It does not make sense to have big object alignment 1296 // since a space lost due to alignment will be greater 1297 // then a saved space from compressed oops. 1298 if ((int)ObjectAlignmentInBytes > 256) { 1299 jio_fprintf(defaultStream::error_stream(), 1300 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n", 1301 (int)ObjectAlignmentInBytes); 1302 return false; 1303 } 1304 // In case page size is very small. 1305 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1306 jio_fprintf(defaultStream::error_stream(), 1307 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n", 1308 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1309 return false; 1310 } 1311 return true; 1312 } 1313 1314 inline uintx max_heap_for_compressed_oops() { 1315 // Avoid sign flip. 1316 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) { 1317 return 0; 1318 } 1319 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1320 NOT_LP64(ShouldNotReachHere(); return 0); 1321 } 1322 1323 bool Arguments::should_auto_select_low_pause_collector() { 1324 if (UseAutoGCSelectPolicy && 1325 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1326 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1327 if (PrintGCDetails) { 1328 // Cannot use gclog_or_tty yet. 1329 tty->print_cr("Automatic selection of the low pause collector" 1330 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1331 } 1332 return true; 1333 } 1334 return false; 1335 } 1336 1337 void Arguments::set_ergonomics_flags() { 1338 // Parallel GC is not compatible with sharing. If one specifies 1339 // that they want sharing explicitly, do not set ergonomics flags. 1340 if (DumpSharedSpaces || RequireSharedSpaces) { 1341 return; 1342 } 1343 1344 if (os::is_server_class_machine() && !force_client_mode ) { 1345 // If no other collector is requested explicitly, 1346 // let the VM select the collector based on 1347 // machine class and automatic selection policy. 1348 if (!UseSerialGC && 1349 !UseConcMarkSweepGC && 1350 !UseG1GC && 1351 !UseParNewGC && 1352 !DumpSharedSpaces && 1353 FLAG_IS_DEFAULT(UseParallelGC)) { 1354 if (should_auto_select_low_pause_collector()) { 1355 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1356 } else { 1357 FLAG_SET_ERGO(bool, UseParallelGC, true); 1358 } 1359 no_shared_spaces(); 1360 } 1361 } 1362 1363 #ifndef ZERO 1364 #ifdef _LP64 1365 // Check that UseCompressedOops can be set with the max heap size allocated 1366 // by ergonomics. 1367 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1368 #if !defined(COMPILER1) || defined(TIERED) 1369 // disable UseCompressedOops by default on MacOS X until 7118647 is fixed 1370 #ifndef __APPLE__ 1371 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1372 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1373 } 1374 #endif // !__APPLE__ 1375 #endif 1376 #ifdef _WIN64 1377 if (UseLargePages && UseCompressedOops) { 1378 // Cannot allocate guard pages for implicit checks in indexed addressing 1379 // mode, when large pages are specified on windows. 1380 // This flag could be switched ON if narrow oop base address is set to 0, 1381 // see code in Universe::initialize_heap(). 1382 Universe::set_narrow_oop_use_implicit_null_checks(false); 1383 } 1384 #endif // _WIN64 1385 } else { 1386 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1387 warning("Max heap size too large for Compressed Oops"); 1388 FLAG_SET_DEFAULT(UseCompressedOops, false); 1389 } 1390 } 1391 // Also checks that certain machines are slower with compressed oops 1392 // in vm_version initialization code. 1393 #endif // _LP64 1394 #endif // !ZERO 1395 } 1396 1397 void Arguments::set_parallel_gc_flags() { 1398 assert(UseParallelGC || UseParallelOldGC, "Error"); 1399 // If parallel old was requested, automatically enable parallel scavenge. 1400 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) { 1401 FLAG_SET_DEFAULT(UseParallelGC, true); 1402 } 1403 1404 // If no heap maximum was requested explicitly, use some reasonable fraction 1405 // of the physical memory, up to a maximum of 1GB. 1406 if (UseParallelGC) { 1407 FLAG_SET_DEFAULT(ParallelGCThreads, 1408 Abstract_VM_Version::parallel_worker_threads()); 1409 1410 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1411 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1412 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1413 // See CR 6362902 for details. 1414 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1415 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1416 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1417 } 1418 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1419 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1420 } 1421 } 1422 1423 if (UseParallelOldGC) { 1424 // Par compact uses lower default values since they are treated as 1425 // minimums. These are different defaults because of the different 1426 // interpretation and are not ergonomically set. 1427 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1428 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1429 } 1430 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1431 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1432 } 1433 } 1434 } 1435 if (UseNUMA) { 1436 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 1437 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 1438 } 1439 // For those collectors or operating systems (eg, Windows) that do 1440 // not support full UseNUMA, we will map to UseNUMAInterleaving for now 1441 UseNUMAInterleaving = true; 1442 } 1443 } 1444 1445 void Arguments::set_g1_gc_flags() { 1446 assert(UseG1GC, "Error"); 1447 #ifdef COMPILER1 1448 FastTLABRefill = false; 1449 #endif 1450 FLAG_SET_DEFAULT(ParallelGCThreads, 1451 Abstract_VM_Version::parallel_worker_threads()); 1452 if (ParallelGCThreads == 0) { 1453 FLAG_SET_DEFAULT(ParallelGCThreads, 1454 Abstract_VM_Version::parallel_worker_threads()); 1455 } 1456 no_shared_spaces(); 1457 1458 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1459 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1460 } 1461 if (PrintGCDetails && Verbose) { 1462 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1463 MarkStackSize / K, MarkStackSizeMax / K); 1464 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1465 } 1466 1467 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1468 // In G1, we want the default GC overhead goal to be higher than 1469 // say in PS. So we set it here to 10%. Otherwise the heap might 1470 // be expanded more aggressively than we would like it to. In 1471 // fact, even 10% seems to not be high enough in some cases 1472 // (especially small GC stress tests that the main thing they do 1473 // is allocation). We might consider increase it further. 1474 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1475 } 1476 } 1477 1478 void Arguments::set_heap_size() { 1479 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1480 // Deprecated flag 1481 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1482 } 1483 1484 const julong phys_mem = 1485 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1486 : (julong)MaxRAM; 1487 1488 // If the maximum heap size has not been set with -Xmx, 1489 // then set it as fraction of the size of physical memory, 1490 // respecting the maximum and minimum sizes of the heap. 1491 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1492 julong reasonable_max = phys_mem / MaxRAMFraction; 1493 1494 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1495 // Small physical memory, so use a minimum fraction of it for the heap 1496 reasonable_max = phys_mem / MinRAMFraction; 1497 } else { 1498 // Not-small physical memory, so require a heap at least 1499 // as large as MaxHeapSize 1500 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1501 } 1502 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1503 // Limit the heap size to ErgoHeapSizeLimit 1504 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1505 } 1506 if (UseCompressedOops) { 1507 // Limit the heap size to the maximum possible when using compressed oops 1508 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1509 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1510 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1511 // but it should be not less than default MaxHeapSize. 1512 max_coop_heap -= HeapBaseMinAddress; 1513 } 1514 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1515 } 1516 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1517 1518 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1519 // An initial heap size was specified on the command line, 1520 // so be sure that the maximum size is consistent. Done 1521 // after call to allocatable_physical_memory because that 1522 // method might reduce the allocation size. 1523 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1524 } 1525 1526 if (PrintGCDetails && Verbose) { 1527 // Cannot use gclog_or_tty yet. 1528 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1529 } 1530 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1531 } 1532 1533 // If the initial_heap_size has not been set with InitialHeapSize 1534 // or -Xms, then set it as fraction of the size of physical memory, 1535 // respecting the maximum and minimum sizes of the heap. 1536 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1537 julong reasonable_minimum = (julong)(OldSize + NewSize); 1538 1539 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1540 1541 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1542 1543 julong reasonable_initial = phys_mem / InitialRAMFraction; 1544 1545 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1546 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1547 1548 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1549 1550 if (PrintGCDetails && Verbose) { 1551 // Cannot use gclog_or_tty yet. 1552 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1553 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1554 } 1555 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1556 set_min_heap_size((uintx)reasonable_minimum); 1557 } 1558 } 1559 1560 // This must be called after ergonomics because we want bytecode rewriting 1561 // if the server compiler is used, or if UseSharedSpaces is disabled. 1562 void Arguments::set_bytecode_flags() { 1563 // Better not attempt to store into a read-only space. 1564 if (UseSharedSpaces) { 1565 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1566 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1567 } 1568 1569 if (!RewriteBytecodes) { 1570 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1571 } 1572 } 1573 1574 // Aggressive optimization flags -XX:+AggressiveOpts 1575 void Arguments::set_aggressive_opts_flags() { 1576 #ifdef COMPILER2 1577 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1578 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1579 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1580 } 1581 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1582 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1583 } 1584 1585 // Feed the cache size setting into the JDK 1586 char buffer[1024]; 1587 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1588 add_property(buffer); 1589 } 1590 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1591 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1592 } 1593 #endif 1594 1595 if (AggressiveOpts) { 1596 // Sample flag setting code 1597 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1598 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1599 // } 1600 } 1601 } 1602 1603 //=========================================================================================================== 1604 // Parsing of java.compiler property 1605 1606 void Arguments::process_java_compiler_argument(char* arg) { 1607 // For backwards compatibility, Djava.compiler=NONE or "" 1608 // causes us to switch to -Xint mode UNLESS -Xdebug 1609 // is also specified. 1610 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1611 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1612 } 1613 } 1614 1615 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1616 _sun_java_launcher = strdup(launcher); 1617 if (strcmp("gamma", _sun_java_launcher) == 0) { 1618 _created_by_gamma_launcher = true; 1619 } 1620 } 1621 1622 bool Arguments::created_by_java_launcher() { 1623 assert(_sun_java_launcher != NULL, "property must have value"); 1624 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1625 } 1626 1627 bool Arguments::created_by_gamma_launcher() { 1628 return _created_by_gamma_launcher; 1629 } 1630 1631 //=========================================================================================================== 1632 // Parsing of main arguments 1633 1634 bool Arguments::verify_interval(uintx val, uintx min, 1635 uintx max, const char* name) { 1636 // Returns true iff value is in the inclusive interval [min..max] 1637 // false, otherwise. 1638 if (val >= min && val <= max) { 1639 return true; 1640 } 1641 jio_fprintf(defaultStream::error_stream(), 1642 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1643 " and " UINTX_FORMAT "\n", 1644 name, val, min, max); 1645 return false; 1646 } 1647 1648 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1649 // Returns true if given value is at least specified min threshold 1650 // false, otherwise. 1651 if (val >= min ) { 1652 return true; 1653 } 1654 jio_fprintf(defaultStream::error_stream(), 1655 "%s of " INTX_FORMAT " is invalid; must be at least " INTX_FORMAT "\n", 1656 name, val, min); 1657 return false; 1658 } 1659 1660 bool Arguments::verify_percentage(uintx value, const char* name) { 1661 if (value <= 100) { 1662 return true; 1663 } 1664 jio_fprintf(defaultStream::error_stream(), 1665 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1666 name, value); 1667 return false; 1668 } 1669 1670 static void force_serial_gc() { 1671 FLAG_SET_DEFAULT(UseSerialGC, true); 1672 FLAG_SET_DEFAULT(UseParNewGC, false); 1673 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1674 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1675 FLAG_SET_DEFAULT(UseParallelGC, false); 1676 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1677 FLAG_SET_DEFAULT(UseG1GC, false); 1678 } 1679 1680 static bool verify_serial_gc_flags() { 1681 return (UseSerialGC && 1682 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1683 UseParallelGC || UseParallelOldGC)); 1684 } 1685 1686 // check if do gclog rotation 1687 // +UseGCLogFileRotation is a must, 1688 // no gc log rotation when log file not supplied or 1689 // NumberOfGCLogFiles is 0, or GCLogFileSize is 0 1690 void check_gclog_consistency() { 1691 if (UseGCLogFileRotation) { 1692 if ((Arguments::gc_log_filename() == NULL) || 1693 (NumberOfGCLogFiles == 0) || 1694 (GCLogFileSize == 0)) { 1695 jio_fprintf(defaultStream::output_stream(), 1696 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files> -XX:GCLogFileSize=<num_of_size>\n" 1697 "where num_of_file > 0 and num_of_size > 0\n" 1698 "GC log rotation is turned off\n"); 1699 UseGCLogFileRotation = false; 1700 } 1701 } 1702 1703 if (UseGCLogFileRotation && GCLogFileSize < 8*K) { 1704 FLAG_SET_CMDLINE(uintx, GCLogFileSize, 8*K); 1705 jio_fprintf(defaultStream::output_stream(), 1706 "GCLogFileSize changed to minimum 8K\n"); 1707 } 1708 } 1709 1710 // Check consistency of GC selection 1711 bool Arguments::check_gc_consistency() { 1712 check_gclog_consistency(); 1713 bool status = true; 1714 // Ensure that the user has not selected conflicting sets 1715 // of collectors. [Note: this check is merely a user convenience; 1716 // collectors over-ride each other so that only a non-conflicting 1717 // set is selected; however what the user gets is not what they 1718 // may have expected from the combination they asked for. It's 1719 // better to reduce user confusion by not allowing them to 1720 // select conflicting combinations. 1721 uint i = 0; 1722 if (UseSerialGC) i++; 1723 if (UseConcMarkSweepGC || UseParNewGC) i++; 1724 if (UseParallelGC || UseParallelOldGC) i++; 1725 if (UseG1GC) i++; 1726 if (i > 1) { 1727 jio_fprintf(defaultStream::error_stream(), 1728 "Conflicting collector combinations in option list; " 1729 "please refer to the release notes for the combinations " 1730 "allowed\n"); 1731 status = false; 1732 } 1733 1734 return status; 1735 } 1736 1737 // Check stack pages settings 1738 bool Arguments::check_stack_pages() 1739 { 1740 bool status = true; 1741 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1742 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1743 // greater stack shadow pages can't generate instruction to bang stack 1744 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1745 return status; 1746 } 1747 1748 // Check the consistency of vm_init_args 1749 bool Arguments::check_vm_args_consistency() { 1750 // Method for adding checks for flag consistency. 1751 // The intent is to warn the user of all possible conflicts, 1752 // before returning an error. 1753 // Note: Needs platform-dependent factoring. 1754 bool status = true; 1755 1756 #if ( (defined(COMPILER2) && defined(SPARC))) 1757 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1758 // on sparc doesn't require generation of a stub as is the case on, e.g., 1759 // x86. Normally, VM_Version_init must be called from init_globals in 1760 // init.cpp, which is called by the initial java thread *after* arguments 1761 // have been parsed. VM_Version_init gets called twice on sparc. 1762 extern void VM_Version_init(); 1763 VM_Version_init(); 1764 if (!VM_Version::has_v9()) { 1765 jio_fprintf(defaultStream::error_stream(), 1766 "V8 Machine detected, Server requires V9\n"); 1767 status = false; 1768 } 1769 #endif /* COMPILER2 && SPARC */ 1770 1771 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1772 // builds so the cost of stack banging can be measured. 1773 #if (defined(PRODUCT) && defined(SOLARIS)) 1774 if (!UseBoundThreads && !UseStackBanging) { 1775 jio_fprintf(defaultStream::error_stream(), 1776 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1777 1778 status = false; 1779 } 1780 #endif 1781 1782 if (TLABRefillWasteFraction == 0) { 1783 jio_fprintf(defaultStream::error_stream(), 1784 "TLABRefillWasteFraction should be a denominator, " 1785 "not " SIZE_FORMAT "\n", 1786 TLABRefillWasteFraction); 1787 status = false; 1788 } 1789 1790 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1791 "AdaptiveSizePolicyWeight"); 1792 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1793 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1794 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1795 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1796 1797 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1798 jio_fprintf(defaultStream::error_stream(), 1799 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1800 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1801 MinHeapFreeRatio, MaxHeapFreeRatio); 1802 status = false; 1803 } 1804 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1805 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1806 1807 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1808 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1809 } 1810 1811 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1812 // Settings to encourage splitting. 1813 if (!FLAG_IS_CMDLINE(NewRatio)) { 1814 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1815 } 1816 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1817 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1818 } 1819 } 1820 1821 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1822 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1823 if (GCTimeLimit == 100) { 1824 // Turn off gc-overhead-limit-exceeded checks 1825 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1826 } 1827 1828 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1829 1830 status = status && check_gc_consistency(); 1831 status = status && check_stack_pages(); 1832 1833 if (_has_alloc_profile) { 1834 if (UseParallelGC || UseParallelOldGC) { 1835 jio_fprintf(defaultStream::error_stream(), 1836 "error: invalid argument combination.\n" 1837 "Allocation profiling (-Xaprof) cannot be used together with " 1838 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1839 status = false; 1840 } 1841 if (UseConcMarkSweepGC) { 1842 jio_fprintf(defaultStream::error_stream(), 1843 "error: invalid argument combination.\n" 1844 "Allocation profiling (-Xaprof) cannot be used together with " 1845 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1846 status = false; 1847 } 1848 } 1849 1850 if (CMSIncrementalMode) { 1851 if (!UseConcMarkSweepGC) { 1852 jio_fprintf(defaultStream::error_stream(), 1853 "error: invalid argument combination.\n" 1854 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1855 "selected in order\nto use CMSIncrementalMode.\n"); 1856 status = false; 1857 } else { 1858 status = status && verify_percentage(CMSIncrementalDutyCycle, 1859 "CMSIncrementalDutyCycle"); 1860 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1861 "CMSIncrementalDutyCycleMin"); 1862 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1863 "CMSIncrementalSafetyFactor"); 1864 status = status && verify_percentage(CMSIncrementalOffset, 1865 "CMSIncrementalOffset"); 1866 status = status && verify_percentage(CMSExpAvgFactor, 1867 "CMSExpAvgFactor"); 1868 // If it was not set on the command line, set 1869 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1870 if (CMSInitiatingOccupancyFraction < 0) { 1871 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1872 } 1873 } 1874 } 1875 1876 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1877 // insists that we hold the requisite locks so that the iteration is 1878 // MT-safe. For the verification at start-up and shut-down, we don't 1879 // yet have a good way of acquiring and releasing these locks, 1880 // which are not visible at the CollectedHeap level. We want to 1881 // be able to acquire these locks and then do the iteration rather 1882 // than just disable the lock verification. This will be fixed under 1883 // bug 4788986. 1884 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1885 if (VerifyGCStartAt == 0) { 1886 warning("Heap verification at start-up disabled " 1887 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1888 VerifyGCStartAt = 1; // Disable verification at start-up 1889 } 1890 if (VerifyBeforeExit) { 1891 warning("Heap verification at shutdown disabled " 1892 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1893 VerifyBeforeExit = false; // Disable verification at shutdown 1894 } 1895 } 1896 1897 // Note: only executed in non-PRODUCT mode 1898 if (!UseAsyncConcMarkSweepGC && 1899 (ExplicitGCInvokesConcurrent || 1900 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1901 jio_fprintf(defaultStream::error_stream(), 1902 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1903 " with -UseAsyncConcMarkSweepGC"); 1904 status = false; 1905 } 1906 1907 status = status && verify_min_value(ParGCArrayScanChunk, 1, "ParGCArrayScanChunk"); 1908 1909 #ifndef SERIALGC 1910 if (UseG1GC) { 1911 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1912 "InitiatingHeapOccupancyPercent"); 1913 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1914 "G1RefProcDrainInterval"); 1915 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1916 "G1ConcMarkStepDurationMillis"); 1917 } 1918 #endif 1919 1920 status = status && verify_interval(RefDiscoveryPolicy, 1921 ReferenceProcessor::DiscoveryPolicyMin, 1922 ReferenceProcessor::DiscoveryPolicyMax, 1923 "RefDiscoveryPolicy"); 1924 1925 // Limit the lower bound of this flag to 1 as it is used in a division 1926 // expression. 1927 status = status && verify_interval(TLABWasteTargetPercent, 1928 1, 100, "TLABWasteTargetPercent"); 1929 1930 status = status && verify_object_alignment(); 1931 1932 return status; 1933 } 1934 1935 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1936 const char* option_type) { 1937 if (ignore) return false; 1938 1939 const char* spacer = " "; 1940 if (option_type == NULL) { 1941 option_type = ++spacer; // Set both to the empty string. 1942 } 1943 1944 if (os::obsolete_option(option)) { 1945 jio_fprintf(defaultStream::error_stream(), 1946 "Obsolete %s%soption: %s\n", option_type, spacer, 1947 option->optionString); 1948 return false; 1949 } else { 1950 jio_fprintf(defaultStream::error_stream(), 1951 "Unrecognized %s%soption: %s\n", option_type, spacer, 1952 option->optionString); 1953 return true; 1954 } 1955 } 1956 1957 static const char* user_assertion_options[] = { 1958 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1959 }; 1960 1961 static const char* system_assertion_options[] = { 1962 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1963 }; 1964 1965 // Return true if any of the strings in null-terminated array 'names' matches. 1966 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 1967 // the option must match exactly. 1968 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 1969 bool tail_allowed) { 1970 for (/* empty */; *names != NULL; ++names) { 1971 if (match_option(option, *names, tail)) { 1972 if (**tail == '\0' || tail_allowed && **tail == ':') { 1973 return true; 1974 } 1975 } 1976 } 1977 return false; 1978 } 1979 1980 bool Arguments::parse_uintx(const char* value, 1981 uintx* uintx_arg, 1982 uintx min_size) { 1983 1984 // Check the sign first since atomull() parses only unsigned values. 1985 bool value_is_positive = !(*value == '-'); 1986 1987 if (value_is_positive) { 1988 julong n; 1989 bool good_return = atomull(value, &n); 1990 if (good_return) { 1991 bool above_minimum = n >= min_size; 1992 bool value_is_too_large = n > max_uintx; 1993 1994 if (above_minimum && !value_is_too_large) { 1995 *uintx_arg = n; 1996 return true; 1997 } 1998 } 1999 } 2000 return false; 2001 } 2002 2003 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2004 julong* long_arg, 2005 julong min_size) { 2006 if (!atomull(s, long_arg)) return arg_unreadable; 2007 return check_memory_size(*long_arg, min_size); 2008 } 2009 2010 // Parse JavaVMInitArgs structure 2011 2012 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2013 // For components of the system classpath. 2014 SysClassPath scp(Arguments::get_sysclasspath()); 2015 bool scp_assembly_required = false; 2016 2017 // Save default settings for some mode flags 2018 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2019 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2020 Arguments::_ClipInlining = ClipInlining; 2021 Arguments::_BackgroundCompilation = BackgroundCompilation; 2022 2023 // Setup flags for mixed which is the default 2024 set_mode_flags(_mixed); 2025 2026 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2027 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2028 if (result != JNI_OK) { 2029 return result; 2030 } 2031 2032 // Parse JavaVMInitArgs structure passed in 2033 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2034 if (result != JNI_OK) { 2035 return result; 2036 } 2037 2038 if (AggressiveOpts) { 2039 // Insert alt-rt.jar between user-specified bootclasspath 2040 // prefix and the default bootclasspath. os::set_boot_path() 2041 // uses meta_index_dir as the default bootclasspath directory. 2042 const char* altclasses_jar = "alt-rt.jar"; 2043 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2044 strlen(altclasses_jar); 2045 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 2046 strcpy(altclasses_path, get_meta_index_dir()); 2047 strcat(altclasses_path, altclasses_jar); 2048 scp.add_suffix_to_prefix(altclasses_path); 2049 scp_assembly_required = true; 2050 FREE_C_HEAP_ARRAY(char, altclasses_path); 2051 } 2052 2053 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2054 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2055 if (result != JNI_OK) { 2056 return result; 2057 } 2058 2059 // Do final processing now that all arguments have been parsed 2060 result = finalize_vm_init_args(&scp, scp_assembly_required); 2061 if (result != JNI_OK) { 2062 return result; 2063 } 2064 2065 return JNI_OK; 2066 } 2067 2068 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2069 SysClassPath* scp_p, 2070 bool* scp_assembly_required_p, 2071 FlagValueOrigin origin) { 2072 // Remaining part of option string 2073 const char* tail; 2074 2075 // iterate over arguments 2076 for (int index = 0; index < args->nOptions; index++) { 2077 bool is_absolute_path = false; // for -agentpath vs -agentlib 2078 2079 const JavaVMOption* option = args->options + index; 2080 2081 if (!match_option(option, "-Djava.class.path", &tail) && 2082 !match_option(option, "-Dsun.java.command", &tail) && 2083 !match_option(option, "-Dsun.java.launcher", &tail)) { 2084 2085 // add all jvm options to the jvm_args string. This string 2086 // is used later to set the java.vm.args PerfData string constant. 2087 // the -Djava.class.path and the -Dsun.java.command options are 2088 // omitted from jvm_args string as each have their own PerfData 2089 // string constant object. 2090 build_jvm_args(option->optionString); 2091 } 2092 2093 // -verbose:[class/gc/jni] 2094 if (match_option(option, "-verbose", &tail)) { 2095 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2096 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2097 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2098 } else if (!strcmp(tail, ":gc")) { 2099 FLAG_SET_CMDLINE(bool, PrintGC, true); 2100 } else if (!strcmp(tail, ":jni")) { 2101 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2102 } 2103 // -da / -ea / -disableassertions / -enableassertions 2104 // These accept an optional class/package name separated by a colon, e.g., 2105 // -da:java.lang.Thread. 2106 } else if (match_option(option, user_assertion_options, &tail, true)) { 2107 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2108 if (*tail == '\0') { 2109 JavaAssertions::setUserClassDefault(enable); 2110 } else { 2111 assert(*tail == ':', "bogus match by match_option()"); 2112 JavaAssertions::addOption(tail + 1, enable); 2113 } 2114 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2115 } else if (match_option(option, system_assertion_options, &tail, false)) { 2116 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2117 JavaAssertions::setSystemClassDefault(enable); 2118 // -bootclasspath: 2119 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2120 scp_p->reset_path(tail); 2121 *scp_assembly_required_p = true; 2122 // -bootclasspath/a: 2123 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2124 scp_p->add_suffix(tail); 2125 *scp_assembly_required_p = true; 2126 // -bootclasspath/p: 2127 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2128 scp_p->add_prefix(tail); 2129 *scp_assembly_required_p = true; 2130 // -Xrun 2131 } else if (match_option(option, "-Xrun", &tail)) { 2132 if (tail != NULL) { 2133 const char* pos = strchr(tail, ':'); 2134 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2135 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2136 name[len] = '\0'; 2137 2138 char *options = NULL; 2139 if(pos != NULL) { 2140 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2141 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 2142 } 2143 #ifdef JVMTI_KERNEL 2144 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2145 warning("profiling and debugging agents are not supported with Kernel VM"); 2146 } else 2147 #endif // JVMTI_KERNEL 2148 add_init_library(name, options); 2149 } 2150 // -agentlib and -agentpath 2151 } else if (match_option(option, "-agentlib:", &tail) || 2152 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2153 if(tail != NULL) { 2154 const char* pos = strchr(tail, '='); 2155 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2156 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2157 name[len] = '\0'; 2158 2159 char *options = NULL; 2160 if(pos != NULL) { 2161 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 2162 } 2163 #ifdef JVMTI_KERNEL 2164 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2165 warning("profiling and debugging agents are not supported with Kernel VM"); 2166 } else 2167 #endif // JVMTI_KERNEL 2168 add_init_agent(name, options, is_absolute_path); 2169 2170 } 2171 // -javaagent 2172 } else if (match_option(option, "-javaagent:", &tail)) { 2173 if(tail != NULL) { 2174 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 2175 add_init_agent("instrument", options, false); 2176 } 2177 // -Xnoclassgc 2178 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2179 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2180 // -Xincgc: i-CMS 2181 } else if (match_option(option, "-Xincgc", &tail)) { 2182 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2183 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2184 // -Xnoincgc: no i-CMS 2185 } else if (match_option(option, "-Xnoincgc", &tail)) { 2186 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2187 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2188 // -Xconcgc 2189 } else if (match_option(option, "-Xconcgc", &tail)) { 2190 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2191 // -Xnoconcgc 2192 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2193 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2194 // -Xbatch 2195 } else if (match_option(option, "-Xbatch", &tail)) { 2196 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2197 // -Xmn for compatibility with other JVM vendors 2198 } else if (match_option(option, "-Xmn", &tail)) { 2199 julong long_initial_eden_size = 0; 2200 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2201 if (errcode != arg_in_range) { 2202 jio_fprintf(defaultStream::error_stream(), 2203 "Invalid initial eden size: %s\n", option->optionString); 2204 describe_range_error(errcode); 2205 return JNI_EINVAL; 2206 } 2207 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2208 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2209 // -Xms 2210 } else if (match_option(option, "-Xms", &tail)) { 2211 julong long_initial_heap_size = 0; 2212 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2213 if (errcode != arg_in_range) { 2214 jio_fprintf(defaultStream::error_stream(), 2215 "Invalid initial heap size: %s\n", option->optionString); 2216 describe_range_error(errcode); 2217 return JNI_EINVAL; 2218 } 2219 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2220 // Currently the minimum size and the initial heap sizes are the same. 2221 set_min_heap_size(InitialHeapSize); 2222 // -Xmx 2223 } else if (match_option(option, "-Xmx", &tail)) { 2224 julong long_max_heap_size = 0; 2225 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2226 if (errcode != arg_in_range) { 2227 jio_fprintf(defaultStream::error_stream(), 2228 "Invalid maximum heap size: %s\n", option->optionString); 2229 describe_range_error(errcode); 2230 return JNI_EINVAL; 2231 } 2232 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2233 // Xmaxf 2234 } else if (match_option(option, "-Xmaxf", &tail)) { 2235 int maxf = (int)(atof(tail) * 100); 2236 if (maxf < 0 || maxf > 100) { 2237 jio_fprintf(defaultStream::error_stream(), 2238 "Bad max heap free percentage size: %s\n", 2239 option->optionString); 2240 return JNI_EINVAL; 2241 } else { 2242 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2243 } 2244 // Xminf 2245 } else if (match_option(option, "-Xminf", &tail)) { 2246 int minf = (int)(atof(tail) * 100); 2247 if (minf < 0 || minf > 100) { 2248 jio_fprintf(defaultStream::error_stream(), 2249 "Bad min heap free percentage size: %s\n", 2250 option->optionString); 2251 return JNI_EINVAL; 2252 } else { 2253 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2254 } 2255 // -Xss 2256 } else if (match_option(option, "-Xss", &tail)) { 2257 julong long_ThreadStackSize = 0; 2258 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2259 if (errcode != arg_in_range) { 2260 jio_fprintf(defaultStream::error_stream(), 2261 "Invalid thread stack size: %s\n", option->optionString); 2262 describe_range_error(errcode); 2263 return JNI_EINVAL; 2264 } 2265 // Internally track ThreadStackSize in units of 1024 bytes. 2266 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2267 round_to((int)long_ThreadStackSize, K) / K); 2268 // -Xoss 2269 } else if (match_option(option, "-Xoss", &tail)) { 2270 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2271 // -Xmaxjitcodesize 2272 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2273 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2274 julong long_ReservedCodeCacheSize = 0; 2275 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2276 (size_t)InitialCodeCacheSize); 2277 if (errcode != arg_in_range) { 2278 jio_fprintf(defaultStream::error_stream(), 2279 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2280 option->optionString, InitialCodeCacheSize/K); 2281 describe_range_error(errcode); 2282 return JNI_EINVAL; 2283 } 2284 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2285 // -green 2286 } else if (match_option(option, "-green", &tail)) { 2287 jio_fprintf(defaultStream::error_stream(), 2288 "Green threads support not available\n"); 2289 return JNI_EINVAL; 2290 // -native 2291 } else if (match_option(option, "-native", &tail)) { 2292 // HotSpot always uses native threads, ignore silently for compatibility 2293 // -Xsqnopause 2294 } else if (match_option(option, "-Xsqnopause", &tail)) { 2295 // EVM option, ignore silently for compatibility 2296 // -Xrs 2297 } else if (match_option(option, "-Xrs", &tail)) { 2298 // Classic/EVM option, new functionality 2299 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2300 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2301 // change default internal VM signals used - lower case for back compat 2302 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2303 // -Xoptimize 2304 } else if (match_option(option, "-Xoptimize", &tail)) { 2305 // EVM option, ignore silently for compatibility 2306 // -Xprof 2307 } else if (match_option(option, "-Xprof", &tail)) { 2308 #ifndef FPROF_KERNEL 2309 _has_profile = true; 2310 #else // FPROF_KERNEL 2311 // do we have to exit? 2312 warning("Kernel VM does not support flat profiling."); 2313 #endif // FPROF_KERNEL 2314 // -Xaprof 2315 } else if (match_option(option, "-Xaprof", &tail)) { 2316 _has_alloc_profile = true; 2317 // -Xconcurrentio 2318 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2319 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2320 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2321 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2322 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2323 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2324 2325 // -Xinternalversion 2326 } else if (match_option(option, "-Xinternalversion", &tail)) { 2327 jio_fprintf(defaultStream::output_stream(), "%s\n", 2328 VM_Version::internal_vm_info_string()); 2329 vm_exit(0); 2330 #ifndef PRODUCT 2331 // -Xprintflags 2332 } else if (match_option(option, "-Xprintflags", &tail)) { 2333 CommandLineFlags::printFlags(); 2334 vm_exit(0); 2335 #endif 2336 // -D 2337 } else if (match_option(option, "-D", &tail)) { 2338 if (!add_property(tail)) { 2339 return JNI_ENOMEM; 2340 } 2341 // Out of the box management support 2342 if (match_option(option, "-Dcom.sun.management", &tail)) { 2343 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2344 } 2345 // -Xint 2346 } else if (match_option(option, "-Xint", &tail)) { 2347 set_mode_flags(_int); 2348 // -Xmixed 2349 } else if (match_option(option, "-Xmixed", &tail)) { 2350 set_mode_flags(_mixed); 2351 // -Xcomp 2352 } else if (match_option(option, "-Xcomp", &tail)) { 2353 // for testing the compiler; turn off all flags that inhibit compilation 2354 set_mode_flags(_comp); 2355 2356 // -Xshare:dump 2357 } else if (match_option(option, "-Xshare:dump", &tail)) { 2358 #ifdef TIERED 2359 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2360 set_mode_flags(_int); // Prevent compilation, which creates objects 2361 #elif defined(COMPILER2) 2362 vm_exit_during_initialization( 2363 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2364 #elif defined(KERNEL) 2365 vm_exit_during_initialization( 2366 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2367 #else 2368 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2369 set_mode_flags(_int); // Prevent compilation, which creates objects 2370 #endif 2371 // -Xshare:on 2372 } else if (match_option(option, "-Xshare:on", &tail)) { 2373 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2374 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2375 // -Xshare:auto 2376 } else if (match_option(option, "-Xshare:auto", &tail)) { 2377 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2378 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2379 // -Xshare:off 2380 } else if (match_option(option, "-Xshare:off", &tail)) { 2381 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2382 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2383 2384 // -Xverify 2385 } else if (match_option(option, "-Xverify", &tail)) { 2386 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2387 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2388 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2389 } else if (strcmp(tail, ":remote") == 0) { 2390 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2391 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2392 } else if (strcmp(tail, ":none") == 0) { 2393 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2394 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2395 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2396 return JNI_EINVAL; 2397 } 2398 // -Xdebug 2399 } else if (match_option(option, "-Xdebug", &tail)) { 2400 // note this flag has been used, then ignore 2401 set_xdebug_mode(true); 2402 // -Xnoagent 2403 } else if (match_option(option, "-Xnoagent", &tail)) { 2404 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2405 } else if (match_option(option, "-Xboundthreads", &tail)) { 2406 // Bind user level threads to kernel threads (Solaris only) 2407 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2408 } else if (match_option(option, "-Xloggc:", &tail)) { 2409 // Redirect GC output to the file. -Xloggc:<filename> 2410 // ostream_init_log(), when called will use this filename 2411 // to initialize a fileStream. 2412 _gc_log_filename = strdup(tail); 2413 FLAG_SET_CMDLINE(bool, PrintGC, true); 2414 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2415 2416 // JNI hooks 2417 } else if (match_option(option, "-Xcheck", &tail)) { 2418 if (!strcmp(tail, ":jni")) { 2419 CheckJNICalls = true; 2420 } else if (is_bad_option(option, args->ignoreUnrecognized, 2421 "check")) { 2422 return JNI_EINVAL; 2423 } 2424 } else if (match_option(option, "vfprintf", &tail)) { 2425 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2426 } else if (match_option(option, "exit", &tail)) { 2427 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2428 } else if (match_option(option, "abort", &tail)) { 2429 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2430 // -XX:+AggressiveHeap 2431 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2432 2433 // This option inspects the machine and attempts to set various 2434 // parameters to be optimal for long-running, memory allocation 2435 // intensive jobs. It is intended for machines with large 2436 // amounts of cpu and memory. 2437 2438 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2439 // VM, but we may not be able to represent the total physical memory 2440 // available (like having 8gb of memory on a box but using a 32bit VM). 2441 // Thus, we need to make sure we're using a julong for intermediate 2442 // calculations. 2443 julong initHeapSize; 2444 julong total_memory = os::physical_memory(); 2445 2446 if (total_memory < (julong)256*M) { 2447 jio_fprintf(defaultStream::error_stream(), 2448 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2449 vm_exit(1); 2450 } 2451 2452 // The heap size is half of available memory, or (at most) 2453 // all of possible memory less 160mb (leaving room for the OS 2454 // when using ISM). This is the maximum; because adaptive sizing 2455 // is turned on below, the actual space used may be smaller. 2456 2457 initHeapSize = MIN2(total_memory / (julong)2, 2458 total_memory - (julong)160*M); 2459 2460 // Make sure that if we have a lot of memory we cap the 32 bit 2461 // process space. The 64bit VM version of this function is a nop. 2462 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2463 2464 // The perm gen is separate but contiguous with the 2465 // object heap (and is reserved with it) so subtract it 2466 // from the heap size. 2467 if (initHeapSize > MaxPermSize) { 2468 initHeapSize = initHeapSize - MaxPermSize; 2469 } else { 2470 warning("AggressiveHeap and MaxPermSize values may conflict"); 2471 } 2472 2473 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2474 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2475 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2476 // Currently the minimum size and the initial heap sizes are the same. 2477 set_min_heap_size(initHeapSize); 2478 } 2479 if (FLAG_IS_DEFAULT(NewSize)) { 2480 // Make the young generation 3/8ths of the total heap. 2481 FLAG_SET_CMDLINE(uintx, NewSize, 2482 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2483 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2484 } 2485 2486 FLAG_SET_DEFAULT(UseLargePages, true); 2487 2488 // Increase some data structure sizes for efficiency 2489 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2490 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2491 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2492 2493 // See the OldPLABSize comment below, but replace 'after promotion' 2494 // with 'after copying'. YoungPLABSize is the size of the survivor 2495 // space per-gc-thread buffers. The default is 4kw. 2496 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2497 2498 // OldPLABSize is the size of the buffers in the old gen that 2499 // UseParallelGC uses to promote live data that doesn't fit in the 2500 // survivor spaces. At any given time, there's one for each gc thread. 2501 // The default size is 1kw. These buffers are rarely used, since the 2502 // survivor spaces are usually big enough. For specjbb, however, there 2503 // are occasions when there's lots of live data in the young gen 2504 // and we end up promoting some of it. We don't have a definite 2505 // explanation for why bumping OldPLABSize helps, but the theory 2506 // is that a bigger PLAB results in retaining something like the 2507 // original allocation order after promotion, which improves mutator 2508 // locality. A minor effect may be that larger PLABs reduce the 2509 // number of PLAB allocation events during gc. The value of 8kw 2510 // was arrived at by experimenting with specjbb. 2511 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2512 2513 // CompilationPolicyChoice=0 causes the server compiler to adopt 2514 // a more conservative which-method-do-I-compile policy when one 2515 // of the counters maintained by the interpreter trips. The 2516 // result is reduced startup time and improved specjbb and 2517 // alacrity performance. Zero is the default, but we set it 2518 // explicitly here in case the default changes. 2519 // See runtime/compilationPolicy.*. 2520 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2521 2522 // Enable parallel GC and adaptive generation sizing 2523 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2524 FLAG_SET_DEFAULT(ParallelGCThreads, 2525 Abstract_VM_Version::parallel_worker_threads()); 2526 2527 // Encourage steady state memory management 2528 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2529 2530 // This appears to improve mutator locality 2531 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2532 2533 // Get around early Solaris scheduling bug 2534 // (affinity vs other jobs on system) 2535 // but disallow DR and offlining (5008695). 2536 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2537 2538 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2539 // The last option must always win. 2540 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2541 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2542 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2543 // The last option must always win. 2544 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2545 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2546 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2547 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2548 jio_fprintf(defaultStream::error_stream(), 2549 "Please use CMSClassUnloadingEnabled in place of " 2550 "CMSPermGenSweepingEnabled in the future\n"); 2551 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2552 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2553 jio_fprintf(defaultStream::error_stream(), 2554 "Please use -XX:+UseGCOverheadLimit in place of " 2555 "-XX:+UseGCTimeLimit in the future\n"); 2556 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2557 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2558 jio_fprintf(defaultStream::error_stream(), 2559 "Please use -XX:-UseGCOverheadLimit in place of " 2560 "-XX:-UseGCTimeLimit in the future\n"); 2561 // The TLE options are for compatibility with 1.3 and will be 2562 // removed without notice in a future release. These options 2563 // are not to be documented. 2564 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2565 // No longer used. 2566 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2567 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2568 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2569 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2570 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2571 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2572 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2573 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2574 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2575 // No longer used. 2576 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2577 julong long_tlab_size = 0; 2578 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2579 if (errcode != arg_in_range) { 2580 jio_fprintf(defaultStream::error_stream(), 2581 "Invalid TLAB size: %s\n", option->optionString); 2582 describe_range_error(errcode); 2583 return JNI_EINVAL; 2584 } 2585 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2586 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2587 // No longer used. 2588 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2589 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2590 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2591 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2592 SOLARIS_ONLY( 2593 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2594 warning("-XX:+UsePermISM is obsolete."); 2595 FLAG_SET_CMDLINE(bool, UseISM, true); 2596 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2597 FLAG_SET_CMDLINE(bool, UseISM, false); 2598 ) 2599 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2600 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2601 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2602 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2603 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2604 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2605 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2606 #if defined(DTRACE_ENABLED) 2607 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2608 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2609 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2610 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2611 #else // defined(DTRACE_ENABLED) 2612 jio_fprintf(defaultStream::error_stream(), 2613 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2614 return JNI_EINVAL; 2615 #endif // defined(DTRACE_ENABLED) 2616 #ifdef ASSERT 2617 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2618 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2619 // disable scavenge before parallel mark-compact 2620 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2621 #endif 2622 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2623 julong cms_blocks_to_claim = (julong)atol(tail); 2624 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2625 jio_fprintf(defaultStream::error_stream(), 2626 "Please use -XX:OldPLABSize in place of " 2627 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2628 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2629 julong cms_blocks_to_claim = (julong)atol(tail); 2630 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2631 jio_fprintf(defaultStream::error_stream(), 2632 "Please use -XX:OldPLABSize in place of " 2633 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2634 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2635 julong old_plab_size = 0; 2636 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2637 if (errcode != arg_in_range) { 2638 jio_fprintf(defaultStream::error_stream(), 2639 "Invalid old PLAB size: %s\n", option->optionString); 2640 describe_range_error(errcode); 2641 return JNI_EINVAL; 2642 } 2643 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2644 jio_fprintf(defaultStream::error_stream(), 2645 "Please use -XX:OldPLABSize in place of " 2646 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2647 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2648 julong young_plab_size = 0; 2649 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2650 if (errcode != arg_in_range) { 2651 jio_fprintf(defaultStream::error_stream(), 2652 "Invalid young PLAB size: %s\n", option->optionString); 2653 describe_range_error(errcode); 2654 return JNI_EINVAL; 2655 } 2656 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2657 jio_fprintf(defaultStream::error_stream(), 2658 "Please use -XX:YoungPLABSize in place of " 2659 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2660 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2661 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2662 julong stack_size = 0; 2663 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2664 if (errcode != arg_in_range) { 2665 jio_fprintf(defaultStream::error_stream(), 2666 "Invalid mark stack size: %s\n", option->optionString); 2667 describe_range_error(errcode); 2668 return JNI_EINVAL; 2669 } 2670 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2671 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2672 julong max_stack_size = 0; 2673 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2674 if (errcode != arg_in_range) { 2675 jio_fprintf(defaultStream::error_stream(), 2676 "Invalid maximum mark stack size: %s\n", 2677 option->optionString); 2678 describe_range_error(errcode); 2679 return JNI_EINVAL; 2680 } 2681 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2682 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2683 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2684 uintx conc_threads = 0; 2685 if (!parse_uintx(tail, &conc_threads, 1)) { 2686 jio_fprintf(defaultStream::error_stream(), 2687 "Invalid concurrent threads: %s\n", option->optionString); 2688 return JNI_EINVAL; 2689 } 2690 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2691 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2692 // Skip -XX:Flags= since that case has already been handled 2693 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2694 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2695 return JNI_EINVAL; 2696 } 2697 } 2698 // Unknown option 2699 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2700 return JNI_ERR; 2701 } 2702 } 2703 2704 // Change the default value for flags which have different default values 2705 // when working with older JDKs. 2706 if (JDK_Version::current().compare_major(6) <= 0 && 2707 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2708 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2709 } 2710 #ifdef LINUX 2711 if (JDK_Version::current().compare_major(6) <= 0 && 2712 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2713 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2714 } 2715 #endif // LINUX 2716 return JNI_OK; 2717 } 2718 2719 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2720 // This must be done after all -D arguments have been processed. 2721 scp_p->expand_endorsed(); 2722 2723 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2724 // Assemble the bootclasspath elements into the final path. 2725 Arguments::set_sysclasspath(scp_p->combined_path()); 2726 } 2727 2728 // This must be done after all arguments have been processed. 2729 // java_compiler() true means set to "NONE" or empty. 2730 if (java_compiler() && !xdebug_mode()) { 2731 // For backwards compatibility, we switch to interpreted mode if 2732 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2733 // not specified. 2734 set_mode_flags(_int); 2735 } 2736 if (CompileThreshold == 0) { 2737 set_mode_flags(_int); 2738 } 2739 2740 #ifndef COMPILER2 2741 // Don't degrade server performance for footprint 2742 if (FLAG_IS_DEFAULT(UseLargePages) && 2743 MaxHeapSize < LargePageHeapSizeThreshold) { 2744 // No need for large granularity pages w/small heaps. 2745 // Note that large pages are enabled/disabled for both the 2746 // Java heap and the code cache. 2747 FLAG_SET_DEFAULT(UseLargePages, false); 2748 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2749 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2750 } 2751 2752 // Tiered compilation is undefined with C1. 2753 TieredCompilation = false; 2754 #else 2755 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2756 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2757 } 2758 #endif 2759 2760 // If we are running in a headless jre, force java.awt.headless property 2761 // to be true unless the property has already been set. 2762 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2763 if (os::is_headless_jre()) { 2764 const char* headless = Arguments::get_property("java.awt.headless"); 2765 if (headless == NULL) { 2766 char envbuffer[128]; 2767 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2768 if (!add_property("java.awt.headless=true")) { 2769 return JNI_ENOMEM; 2770 } 2771 } else { 2772 char buffer[256]; 2773 strcpy(buffer, "java.awt.headless="); 2774 strcat(buffer, envbuffer); 2775 if (!add_property(buffer)) { 2776 return JNI_ENOMEM; 2777 } 2778 } 2779 } 2780 } 2781 2782 if (!check_vm_args_consistency()) { 2783 return JNI_ERR; 2784 } 2785 2786 return JNI_OK; 2787 } 2788 2789 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2790 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2791 scp_assembly_required_p); 2792 } 2793 2794 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2795 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2796 scp_assembly_required_p); 2797 } 2798 2799 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2800 const int N_MAX_OPTIONS = 64; 2801 const int OPTION_BUFFER_SIZE = 1024; 2802 char buffer[OPTION_BUFFER_SIZE]; 2803 2804 // The variable will be ignored if it exceeds the length of the buffer. 2805 // Don't check this variable if user has special privileges 2806 // (e.g. unix su command). 2807 if (os::getenv(name, buffer, sizeof(buffer)) && 2808 !os::have_special_privileges()) { 2809 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2810 jio_fprintf(defaultStream::error_stream(), 2811 "Picked up %s: %s\n", name, buffer); 2812 char* rd = buffer; // pointer to the input string (rd) 2813 int i; 2814 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2815 while (isspace(*rd)) rd++; // skip whitespace 2816 if (*rd == 0) break; // we re done when the input string is read completely 2817 2818 // The output, option string, overwrites the input string. 2819 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2820 // input string (rd). 2821 char* wrt = rd; 2822 2823 options[i++].optionString = wrt; // Fill in option 2824 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2825 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2826 int quote = *rd; // matching quote to look for 2827 rd++; // don't copy open quote 2828 while (*rd != quote) { // include everything (even spaces) up until quote 2829 if (*rd == 0) { // string termination means unmatched string 2830 jio_fprintf(defaultStream::error_stream(), 2831 "Unmatched quote in %s\n", name); 2832 return JNI_ERR; 2833 } 2834 *wrt++ = *rd++; // copy to option string 2835 } 2836 rd++; // don't copy close quote 2837 } else { 2838 *wrt++ = *rd++; // copy to option string 2839 } 2840 } 2841 // Need to check if we're done before writing a NULL, 2842 // because the write could be to the byte that rd is pointing to. 2843 if (*rd++ == 0) { 2844 *wrt = 0; 2845 break; 2846 } 2847 *wrt = 0; // Zero terminate option 2848 } 2849 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2850 JavaVMInitArgs vm_args; 2851 vm_args.version = JNI_VERSION_1_2; 2852 vm_args.options = options; 2853 vm_args.nOptions = i; 2854 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2855 2856 if (PrintVMOptions) { 2857 const char* tail; 2858 for (int i = 0; i < vm_args.nOptions; i++) { 2859 const JavaVMOption *option = vm_args.options + i; 2860 if (match_option(option, "-XX:", &tail)) { 2861 logOption(tail); 2862 } 2863 } 2864 } 2865 2866 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2867 } 2868 return JNI_OK; 2869 } 2870 2871 void Arguments::set_shared_spaces_flags() { 2872 const bool must_share = DumpSharedSpaces || RequireSharedSpaces; 2873 const bool might_share = must_share || UseSharedSpaces; 2874 2875 // The string table is part of the shared archive so the size must match. 2876 if (!FLAG_IS_DEFAULT(StringTableSize)) { 2877 // Disable sharing. 2878 if (must_share) { 2879 warning("disabling shared archive %s because of non-default " 2880 "StringTableSize", DumpSharedSpaces ? "creation" : "use"); 2881 } 2882 if (might_share) { 2883 FLAG_SET_DEFAULT(DumpSharedSpaces, false); 2884 FLAG_SET_DEFAULT(RequireSharedSpaces, false); 2885 FLAG_SET_DEFAULT(UseSharedSpaces, false); 2886 } 2887 return; 2888 } 2889 2890 // Check whether class data sharing settings conflict with GC, compressed oops 2891 // or page size, and fix them up. Explicit sharing options override other 2892 // settings. 2893 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode || 2894 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC || 2895 UseCompressedOops || UseLargePages && FLAG_IS_CMDLINE(UseLargePages); 2896 if (cannot_share) { 2897 if (must_share) { 2898 warning("selecting serial gc and disabling large pages %s" 2899 "because of %s", "" LP64_ONLY("and compressed oops "), 2900 DumpSharedSpaces ? "-Xshare:dump" : "-Xshare:on"); 2901 force_serial_gc(); 2902 FLAG_SET_CMDLINE(bool, UseLargePages, false); 2903 LP64_ONLY(FLAG_SET_CMDLINE(bool, UseCompressedOops, false)); 2904 } else { 2905 if (UseSharedSpaces && Verbose) { 2906 warning("turning off use of shared archive because of " 2907 "choice of garbage collector or large pages"); 2908 } 2909 no_shared_spaces(); 2910 } 2911 } else if (UseLargePages && might_share) { 2912 // Disable large pages to allow shared spaces. This is sub-optimal, since 2913 // there may not even be a shared archive to use. 2914 FLAG_SET_DEFAULT(UseLargePages, false); 2915 } 2916 } 2917 2918 // Disable options not supported in this release, with a warning if they 2919 // were explicitly requested on the command-line 2920 #define UNSUPPORTED_OPTION(opt, description) \ 2921 do { \ 2922 if (opt) { \ 2923 if (FLAG_IS_CMDLINE(opt)) { \ 2924 warning(description " is disabled in this release."); \ 2925 } \ 2926 FLAG_SET_DEFAULT(opt, false); \ 2927 } \ 2928 } while(0) 2929 2930 // Parse entry point called from JNI_CreateJavaVM 2931 2932 jint Arguments::parse(const JavaVMInitArgs* args) { 2933 2934 // Sharing support 2935 // Construct the path to the archive 2936 char jvm_path[JVM_MAXPATHLEN]; 2937 os::jvm_path(jvm_path, sizeof(jvm_path)); 2938 #ifdef TIERED 2939 if (strstr(jvm_path, "client") != NULL) { 2940 force_client_mode = true; 2941 } 2942 #endif // TIERED 2943 char *end = strrchr(jvm_path, *os::file_separator()); 2944 if (end != NULL) *end = '\0'; 2945 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2946 strlen(os::file_separator()) + 20); 2947 if (shared_archive_path == NULL) return JNI_ENOMEM; 2948 strcpy(shared_archive_path, jvm_path); 2949 strcat(shared_archive_path, os::file_separator()); 2950 strcat(shared_archive_path, "classes"); 2951 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2952 strcat(shared_archive_path, ".jsa"); 2953 SharedArchivePath = shared_archive_path; 2954 2955 // Remaining part of option string 2956 const char* tail; 2957 2958 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2959 bool settings_file_specified = false; 2960 const char* flags_file; 2961 int index; 2962 for (index = 0; index < args->nOptions; index++) { 2963 const JavaVMOption *option = args->options + index; 2964 if (match_option(option, "-XX:Flags=", &tail)) { 2965 flags_file = tail; 2966 settings_file_specified = true; 2967 } 2968 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2969 PrintVMOptions = true; 2970 } 2971 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2972 PrintVMOptions = false; 2973 } 2974 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2975 IgnoreUnrecognizedVMOptions = true; 2976 } 2977 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2978 IgnoreUnrecognizedVMOptions = false; 2979 } 2980 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 2981 CommandLineFlags::printFlags(); 2982 vm_exit(0); 2983 } 2984 2985 #ifndef PRODUCT 2986 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 2987 CommandLineFlags::printFlags(true); 2988 vm_exit(0); 2989 } 2990 #endif 2991 } 2992 2993 if (IgnoreUnrecognizedVMOptions) { 2994 // uncast const to modify the flag args->ignoreUnrecognized 2995 *(jboolean*)(&args->ignoreUnrecognized) = true; 2996 } 2997 2998 // Parse specified settings file 2999 if (settings_file_specified) { 3000 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3001 return JNI_EINVAL; 3002 } 3003 } 3004 3005 // Parse default .hotspotrc settings file 3006 if (!settings_file_specified) { 3007 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3008 return JNI_EINVAL; 3009 } 3010 } 3011 3012 if (PrintVMOptions) { 3013 for (index = 0; index < args->nOptions; index++) { 3014 const JavaVMOption *option = args->options + index; 3015 if (match_option(option, "-XX:", &tail)) { 3016 logOption(tail); 3017 } 3018 } 3019 } 3020 3021 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3022 jint result = parse_vm_init_args(args); 3023 if (result != JNI_OK) { 3024 return result; 3025 } 3026 3027 #ifdef JAVASE_EMBEDDED 3028 UNSUPPORTED_OPTION(UseG1GC, "G1 GC"); 3029 #endif 3030 3031 #ifndef PRODUCT 3032 if (TraceBytecodesAt != 0) { 3033 TraceBytecodes = true; 3034 } 3035 if (CountCompiledCalls) { 3036 if (UseCounterDecay) { 3037 warning("UseCounterDecay disabled because CountCalls is set"); 3038 UseCounterDecay = false; 3039 } 3040 } 3041 #endif // PRODUCT 3042 3043 // Transitional 3044 if (EnableMethodHandles || AnonymousClasses) { 3045 if (!EnableInvokeDynamic && !FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3046 warning("EnableMethodHandles and AnonymousClasses are obsolete. Keeping EnableInvokeDynamic disabled."); 3047 } else { 3048 EnableInvokeDynamic = true; 3049 } 3050 } 3051 3052 // JSR 292 is not supported before 1.7 3053 if (!JDK_Version::is_gte_jdk17x_version()) { 3054 if (EnableInvokeDynamic) { 3055 if (!FLAG_IS_DEFAULT(EnableInvokeDynamic)) { 3056 warning("JSR 292 is not supported before 1.7. Disabling support."); 3057 } 3058 EnableInvokeDynamic = false; 3059 } 3060 } 3061 3062 if (EnableInvokeDynamic && ScavengeRootsInCode == 0) { 3063 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3064 warning("forcing ScavengeRootsInCode non-zero because EnableInvokeDynamic is true"); 3065 } 3066 ScavengeRootsInCode = 1; 3067 } 3068 if (!JavaObjectsInPerm && ScavengeRootsInCode == 0) { 3069 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3070 warning("forcing ScavengeRootsInCode non-zero because JavaObjectsInPerm is false"); 3071 } 3072 ScavengeRootsInCode = 1; 3073 } 3074 3075 if (PrintGCDetails) { 3076 // Turn on -verbose:gc options as well 3077 PrintGC = true; 3078 } 3079 3080 // Set object alignment values. 3081 set_object_alignment(); 3082 3083 #ifdef SERIALGC 3084 force_serial_gc(); 3085 #endif // SERIALGC 3086 #ifdef KERNEL 3087 no_shared_spaces(); 3088 #endif // KERNEL 3089 3090 // Set flags based on ergonomics. 3091 set_ergonomics_flags(); 3092 3093 set_shared_spaces_flags(); 3094 3095 // Check the GC selections again. 3096 if (!check_gc_consistency()) { 3097 return JNI_EINVAL; 3098 } 3099 3100 if (TieredCompilation) { 3101 set_tiered_flags(); 3102 } else { 3103 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3104 if (CompilationPolicyChoice >= 2) { 3105 vm_exit_during_initialization( 3106 "Incompatible compilation policy selected", NULL); 3107 } 3108 } 3109 3110 #ifndef KERNEL 3111 // Set heap size based on available physical memory 3112 set_heap_size(); 3113 // Set per-collector flags 3114 if (UseParallelGC || UseParallelOldGC) { 3115 set_parallel_gc_flags(); 3116 } else if (UseConcMarkSweepGC) { // should be done before ParNew check below 3117 set_cms_and_parnew_gc_flags(); 3118 } else if (UseParNewGC) { // skipped if CMS is set above 3119 set_parnew_gc_flags(); 3120 } else if (UseG1GC) { 3121 set_g1_gc_flags(); 3122 } 3123 #endif // KERNEL 3124 3125 #ifdef SERIALGC 3126 assert(verify_serial_gc_flags(), "SerialGC unset"); 3127 #endif // SERIALGC 3128 3129 // Set bytecode rewriting flags 3130 set_bytecode_flags(); 3131 3132 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3133 set_aggressive_opts_flags(); 3134 3135 // Turn off biased locking for locking debug mode flags, 3136 // which are subtlely different from each other but neither works with 3137 // biased locking. 3138 if (UseHeavyMonitors 3139 #ifdef COMPILER1 3140 || !UseFastLocking 3141 #endif // COMPILER1 3142 ) { 3143 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3144 // flag set to true on command line; warn the user that they 3145 // can't enable biased locking here 3146 warning("Biased Locking is not supported with locking debug flags" 3147 "; ignoring UseBiasedLocking flag." ); 3148 } 3149 UseBiasedLocking = false; 3150 } 3151 3152 #ifdef CC_INTERP 3153 // Clear flags not supported by the C++ interpreter 3154 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3155 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3156 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3157 #endif // CC_INTERP 3158 3159 #ifdef COMPILER2 3160 if (!UseBiasedLocking || EmitSync != 0) { 3161 UseOptoBiasInlining = false; 3162 } 3163 #endif 3164 3165 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3166 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3167 DebugNonSafepoints = true; 3168 } 3169 3170 #ifndef PRODUCT 3171 if (CompileTheWorld) { 3172 // Force NmethodSweeper to sweep whole CodeCache each time. 3173 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3174 NmethodSweepFraction = 1; 3175 } 3176 } 3177 #endif 3178 3179 if (PrintCommandLineFlags) { 3180 CommandLineFlags::printSetFlags(); 3181 } 3182 3183 // Apply CPU specific policy for the BiasedLocking 3184 if (UseBiasedLocking) { 3185 if (!VM_Version::use_biased_locking() && 3186 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3187 UseBiasedLocking = false; 3188 } 3189 } 3190 3191 // set PauseAtExit if the gamma launcher was used and a debugger is attached 3192 // but only if not already set on the commandline 3193 if (Arguments::created_by_gamma_launcher() && os::is_debugger_attached()) { 3194 bool set = false; 3195 CommandLineFlags::wasSetOnCmdline("PauseAtExit", &set); 3196 if (!set) { 3197 FLAG_SET_DEFAULT(PauseAtExit, true); 3198 } 3199 } 3200 3201 return JNI_OK; 3202 } 3203 3204 int Arguments::PropertyList_count(SystemProperty* pl) { 3205 int count = 0; 3206 while(pl != NULL) { 3207 count++; 3208 pl = pl->next(); 3209 } 3210 return count; 3211 } 3212 3213 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3214 assert(key != NULL, "just checking"); 3215 SystemProperty* prop; 3216 for (prop = pl; prop != NULL; prop = prop->next()) { 3217 if (strcmp(key, prop->key()) == 0) return prop->value(); 3218 } 3219 return NULL; 3220 } 3221 3222 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3223 int count = 0; 3224 const char* ret_val = NULL; 3225 3226 while(pl != NULL) { 3227 if(count >= index) { 3228 ret_val = pl->key(); 3229 break; 3230 } 3231 count++; 3232 pl = pl->next(); 3233 } 3234 3235 return ret_val; 3236 } 3237 3238 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3239 int count = 0; 3240 char* ret_val = NULL; 3241 3242 while(pl != NULL) { 3243 if(count >= index) { 3244 ret_val = pl->value(); 3245 break; 3246 } 3247 count++; 3248 pl = pl->next(); 3249 } 3250 3251 return ret_val; 3252 } 3253 3254 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3255 SystemProperty* p = *plist; 3256 if (p == NULL) { 3257 *plist = new_p; 3258 } else { 3259 while (p->next() != NULL) { 3260 p = p->next(); 3261 } 3262 p->set_next(new_p); 3263 } 3264 } 3265 3266 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3267 if (plist == NULL) 3268 return; 3269 3270 SystemProperty* new_p = new SystemProperty(k, v, true); 3271 PropertyList_add(plist, new_p); 3272 } 3273 3274 // This add maintains unique property key in the list. 3275 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3276 if (plist == NULL) 3277 return; 3278 3279 // If property key exist then update with new value. 3280 SystemProperty* prop; 3281 for (prop = *plist; prop != NULL; prop = prop->next()) { 3282 if (strcmp(k, prop->key()) == 0) { 3283 if (append) { 3284 prop->append_value(v); 3285 } else { 3286 prop->set_value(v); 3287 } 3288 return; 3289 } 3290 } 3291 3292 PropertyList_add(plist, k, v); 3293 } 3294 3295 #ifdef KERNEL 3296 char *Arguments::get_kernel_properties() { 3297 // Find properties starting with kernel and append them to string 3298 // We need to find out how long they are first because the URL's that they 3299 // might point to could get long. 3300 int length = 0; 3301 SystemProperty* prop; 3302 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3303 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3304 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3305 } 3306 } 3307 // Add one for null terminator. 3308 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 3309 if (length != 0) { 3310 int pos = 0; 3311 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3312 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3313 jio_snprintf(&props[pos], length-pos, 3314 "-D%s=%s ", prop->key(), prop->value()); 3315 pos = strlen(props); 3316 } 3317 } 3318 } 3319 // null terminate props in case of null 3320 props[length] = '\0'; 3321 return props; 3322 } 3323 #endif // KERNEL 3324 3325 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3326 // Returns true if all of the source pointed by src has been copied over to 3327 // the destination buffer pointed by buf. Otherwise, returns false. 3328 // Notes: 3329 // 1. If the length (buflen) of the destination buffer excluding the 3330 // NULL terminator character is not long enough for holding the expanded 3331 // pid characters, it also returns false instead of returning the partially 3332 // expanded one. 3333 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3334 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3335 char* buf, size_t buflen) { 3336 const char* p = src; 3337 char* b = buf; 3338 const char* src_end = &src[srclen]; 3339 char* buf_end = &buf[buflen - 1]; 3340 3341 while (p < src_end && b < buf_end) { 3342 if (*p == '%') { 3343 switch (*(++p)) { 3344 case '%': // "%%" ==> "%" 3345 *b++ = *p++; 3346 break; 3347 case 'p': { // "%p" ==> current process id 3348 // buf_end points to the character before the last character so 3349 // that we could write '\0' to the end of the buffer. 3350 size_t buf_sz = buf_end - b + 1; 3351 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3352 3353 // if jio_snprintf fails or the buffer is not long enough to hold 3354 // the expanded pid, returns false. 3355 if (ret < 0 || ret >= (int)buf_sz) { 3356 return false; 3357 } else { 3358 b += ret; 3359 assert(*b == '\0', "fail in copy_expand_pid"); 3360 if (p == src_end && b == buf_end + 1) { 3361 // reach the end of the buffer. 3362 return true; 3363 } 3364 } 3365 p++; 3366 break; 3367 } 3368 default : 3369 *b++ = '%'; 3370 } 3371 } else { 3372 *b++ = *p++; 3373 } 3374 } 3375 *b = '\0'; 3376 return (p == src_end); // return false if not all of the source was copied 3377 }