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_ARCH_x86 41 # include "vm_version_x86.hpp" 42 #endif 43 #ifdef TARGET_ARCH_sparc 44 # include "vm_version_sparc.hpp" 45 #endif 46 #ifdef TARGET_ARCH_zero 47 # include "vm_version_zero.hpp" 48 #endif 49 #ifdef TARGET_OS_FAMILY_linux 50 # include "os_linux.inline.hpp" 51 #endif 52 #ifdef TARGET_OS_FAMILY_solaris 53 # include "os_solaris.inline.hpp" 54 #endif 55 #ifdef TARGET_OS_FAMILY_windows 56 # include "os_windows.inline.hpp" 57 #endif 58 #ifndef SERIALGC 59 #include "gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.hpp" 60 #endif 61 62 #define DEFAULT_VENDOR_URL_BUG "http://java.sun.com/webapps/bugreport/crash.jsp" 63 #define DEFAULT_JAVA_LAUNCHER "generic" 64 65 char** Arguments::_jvm_flags_array = NULL; 66 int Arguments::_num_jvm_flags = 0; 67 char** Arguments::_jvm_args_array = NULL; 68 int Arguments::_num_jvm_args = 0; 69 char* Arguments::_java_command = NULL; 70 SystemProperty* Arguments::_system_properties = NULL; 71 const char* Arguments::_gc_log_filename = NULL; 72 bool Arguments::_has_profile = false; 73 bool Arguments::_has_alloc_profile = false; 74 uintx Arguments::_min_heap_size = 0; 75 Arguments::Mode Arguments::_mode = _mixed; 76 bool Arguments::_java_compiler = false; 77 bool Arguments::_xdebug_mode = false; 78 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 79 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 80 int Arguments::_sun_java_launcher_pid = -1; 81 82 // These parameters are reset in method parse_vm_init_args(JavaVMInitArgs*) 83 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 84 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 85 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 86 bool Arguments::_ClipInlining = ClipInlining; 87 88 char* Arguments::SharedArchivePath = NULL; 89 90 AgentLibraryList Arguments::_libraryList; 91 AgentLibraryList Arguments::_agentList; 92 93 abort_hook_t Arguments::_abort_hook = NULL; 94 exit_hook_t Arguments::_exit_hook = NULL; 95 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 96 97 98 SystemProperty *Arguments::_java_ext_dirs = NULL; 99 SystemProperty *Arguments::_java_endorsed_dirs = NULL; 100 SystemProperty *Arguments::_sun_boot_library_path = NULL; 101 SystemProperty *Arguments::_java_library_path = NULL; 102 SystemProperty *Arguments::_java_home = NULL; 103 SystemProperty *Arguments::_java_class_path = NULL; 104 SystemProperty *Arguments::_sun_boot_class_path = NULL; 105 106 char* Arguments::_meta_index_path = NULL; 107 char* Arguments::_meta_index_dir = NULL; 108 109 static bool force_client_mode = false; 110 111 // Check if head of 'option' matches 'name', and sets 'tail' remaining part of option string 112 113 static bool match_option(const JavaVMOption *option, const char* name, 114 const char** tail) { 115 int len = (int)strlen(name); 116 if (strncmp(option->optionString, name, len) == 0) { 117 *tail = option->optionString + len; 118 return true; 119 } else { 120 return false; 121 } 122 } 123 124 static void logOption(const char* opt) { 125 if (PrintVMOptions) { 126 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 127 } 128 } 129 130 // Process java launcher properties. 131 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 132 // See if sun.java.launcher or sun.java.launcher.pid is defined. 133 // Must do this before setting up other system properties, 134 // as some of them may depend on launcher type. 135 for (int index = 0; index < args->nOptions; index++) { 136 const JavaVMOption* option = args->options + index; 137 const char* tail; 138 139 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 140 process_java_launcher_argument(tail, option->extraInfo); 141 continue; 142 } 143 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 144 _sun_java_launcher_pid = atoi(tail); 145 continue; 146 } 147 } 148 } 149 150 // Initialize system properties key and value. 151 void Arguments::init_system_properties() { 152 153 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 154 "Java Virtual Machine Specification", false)); 155 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 156 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 157 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 158 159 // following are JVMTI agent writeable properties. 160 // Properties values are set to NULL and they are 161 // os specific they are initialized in os::init_system_properties_values(). 162 _java_ext_dirs = new SystemProperty("java.ext.dirs", NULL, true); 163 _java_endorsed_dirs = new SystemProperty("java.endorsed.dirs", NULL, true); 164 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 165 _java_library_path = new SystemProperty("java.library.path", NULL, true); 166 _java_home = new SystemProperty("java.home", NULL, true); 167 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 168 169 _java_class_path = new SystemProperty("java.class.path", "", true); 170 171 // Add to System Property list. 172 PropertyList_add(&_system_properties, _java_ext_dirs); 173 PropertyList_add(&_system_properties, _java_endorsed_dirs); 174 PropertyList_add(&_system_properties, _sun_boot_library_path); 175 PropertyList_add(&_system_properties, _java_library_path); 176 PropertyList_add(&_system_properties, _java_home); 177 PropertyList_add(&_system_properties, _java_class_path); 178 PropertyList_add(&_system_properties, _sun_boot_class_path); 179 180 // Set OS specific system properties values 181 os::init_system_properties_values(); 182 } 183 184 185 // Update/Initialize System properties after JDK version number is known 186 void Arguments::init_version_specific_system_properties() { 187 enum { bufsz = 16 }; 188 char buffer[bufsz]; 189 const char* spec_vendor = "Sun Microsystems Inc."; 190 uint32_t spec_version = 0; 191 192 if (JDK_Version::is_gte_jdk17x_version()) { 193 spec_vendor = "Oracle Corporation"; 194 spec_version = JDK_Version::current().major_version(); 195 } 196 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 197 198 PropertyList_add(&_system_properties, 199 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 200 PropertyList_add(&_system_properties, 201 new SystemProperty("java.vm.specification.version", buffer, false)); 202 PropertyList_add(&_system_properties, 203 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 204 } 205 206 /** 207 * Provide a slightly more user-friendly way of eliminating -XX flags. 208 * When a flag is eliminated, it can be added to this list in order to 209 * continue accepting this flag on the command-line, while issuing a warning 210 * and ignoring the value. Once the JDK version reaches the 'accept_until' 211 * limit, we flatly refuse to admit the existence of the flag. This allows 212 * a flag to die correctly over JDK releases using HSX. 213 */ 214 typedef struct { 215 const char* name; 216 JDK_Version obsoleted_in; // when the flag went away 217 JDK_Version accept_until; // which version to start denying the existence 218 } ObsoleteFlag; 219 220 static ObsoleteFlag obsolete_jvm_flags[] = { 221 { "UseTrainGC", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 222 { "UseSpecialLargeObjectHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 223 { "UseOversizedCarHandling", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 224 { "TraceCarAllocation", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 225 { "PrintTrainGCProcessingStats", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 226 { "LogOfCarSpaceSize", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 227 { "OversizedCarThreshold", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 228 { "MinTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 229 { "DefaultTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 230 { "MaxTickInterval", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 231 { "DelayTickAdjustment", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 232 { "ProcessingToTenuringRatio", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 233 { "MinTrainLength", JDK_Version::jdk(5), JDK_Version::jdk(7) }, 234 { "AppendRatio", JDK_Version::jdk_update(6,10), JDK_Version::jdk(7) }, 235 { "DefaultMaxRAM", JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 236 { "DefaultInitialRAMFraction", 237 JDK_Version::jdk_update(6,18), JDK_Version::jdk(7) }, 238 { "UseDepthFirstScavengeOrder", 239 JDK_Version::jdk_update(6,22), JDK_Version::jdk(7) }, 240 { "HandlePromotionFailure", 241 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 242 { "MaxLiveObjectEvacuationRatio", 243 JDK_Version::jdk_update(6,24), JDK_Version::jdk(8) }, 244 { NULL, JDK_Version(0), JDK_Version(0) } 245 }; 246 247 // Returns true if the flag is obsolete and fits into the range specified 248 // for being ignored. In the case that the flag is ignored, the 'version' 249 // value is filled in with the version number when the flag became 250 // obsolete so that that value can be displayed to the user. 251 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 252 int i = 0; 253 assert(version != NULL, "Must provide a version buffer"); 254 while (obsolete_jvm_flags[i].name != NULL) { 255 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 256 // <flag>=xxx form 257 // [-|+]<flag> form 258 if ((strncmp(flag_status.name, s, strlen(flag_status.name)) == 0) || 259 ((s[0] == '+' || s[0] == '-') && 260 (strncmp(flag_status.name, &s[1], strlen(flag_status.name)) == 0))) { 261 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 262 *version = flag_status.obsoleted_in; 263 return true; 264 } 265 } 266 i++; 267 } 268 return false; 269 } 270 271 // Constructs the system class path (aka boot class path) from the following 272 // components, in order: 273 // 274 // prefix // from -Xbootclasspath/p:... 275 // endorsed // the expansion of -Djava.endorsed.dirs=... 276 // base // from os::get_system_properties() or -Xbootclasspath= 277 // suffix // from -Xbootclasspath/a:... 278 // 279 // java.endorsed.dirs is a list of directories; any jar or zip files in the 280 // directories are added to the sysclasspath just before the base. 281 // 282 // This could be AllStatic, but it isn't needed after argument processing is 283 // complete. 284 class SysClassPath: public StackObj { 285 public: 286 SysClassPath(const char* base); 287 ~SysClassPath(); 288 289 inline void set_base(const char* base); 290 inline void add_prefix(const char* prefix); 291 inline void add_suffix_to_prefix(const char* suffix); 292 inline void add_suffix(const char* suffix); 293 inline void reset_path(const char* base); 294 295 // Expand the jar/zip files in each directory listed by the java.endorsed.dirs 296 // property. Must be called after all command-line arguments have been 297 // processed (in particular, -Djava.endorsed.dirs=...) and before calling 298 // combined_path(). 299 void expand_endorsed(); 300 301 inline const char* get_base() const { return _items[_scp_base]; } 302 inline const char* get_prefix() const { return _items[_scp_prefix]; } 303 inline const char* get_suffix() const { return _items[_scp_suffix]; } 304 inline const char* get_endorsed() const { return _items[_scp_endorsed]; } 305 306 // Combine all the components into a single c-heap-allocated string; caller 307 // must free the string if/when no longer needed. 308 char* combined_path(); 309 310 private: 311 // Utility routines. 312 static char* add_to_path(const char* path, const char* str, bool prepend); 313 static char* add_jars_to_path(char* path, const char* directory); 314 315 inline void reset_item_at(int index); 316 317 // Array indices for the items that make up the sysclasspath. All except the 318 // base are allocated in the C heap and freed by this class. 319 enum { 320 _scp_prefix, // from -Xbootclasspath/p:... 321 _scp_endorsed, // the expansion of -Djava.endorsed.dirs=... 322 _scp_base, // the default sysclasspath 323 _scp_suffix, // from -Xbootclasspath/a:... 324 _scp_nitems // the number of items, must be last. 325 }; 326 327 const char* _items[_scp_nitems]; 328 DEBUG_ONLY(bool _expansion_done;) 329 }; 330 331 SysClassPath::SysClassPath(const char* base) { 332 memset(_items, 0, sizeof(_items)); 333 _items[_scp_base] = base; 334 DEBUG_ONLY(_expansion_done = false;) 335 } 336 337 SysClassPath::~SysClassPath() { 338 // Free everything except the base. 339 for (int i = 0; i < _scp_nitems; ++i) { 340 if (i != _scp_base) reset_item_at(i); 341 } 342 DEBUG_ONLY(_expansion_done = false;) 343 } 344 345 inline void SysClassPath::set_base(const char* base) { 346 _items[_scp_base] = base; 347 } 348 349 inline void SysClassPath::add_prefix(const char* prefix) { 350 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 351 } 352 353 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 354 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 355 } 356 357 inline void SysClassPath::add_suffix(const char* suffix) { 358 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 359 } 360 361 inline void SysClassPath::reset_item_at(int index) { 362 assert(index < _scp_nitems && index != _scp_base, "just checking"); 363 if (_items[index] != NULL) { 364 FREE_C_HEAP_ARRAY(char, _items[index]); 365 _items[index] = NULL; 366 } 367 } 368 369 inline void SysClassPath::reset_path(const char* base) { 370 // Clear the prefix and suffix. 371 reset_item_at(_scp_prefix); 372 reset_item_at(_scp_suffix); 373 set_base(base); 374 } 375 376 //------------------------------------------------------------------------------ 377 378 void SysClassPath::expand_endorsed() { 379 assert(_items[_scp_endorsed] == NULL, "can only be called once."); 380 381 const char* path = Arguments::get_property("java.endorsed.dirs"); 382 if (path == NULL) { 383 path = Arguments::get_endorsed_dir(); 384 assert(path != NULL, "no default for java.endorsed.dirs"); 385 } 386 387 char* expanded_path = NULL; 388 const char separator = *os::path_separator(); 389 const char* const end = path + strlen(path); 390 while (path < end) { 391 const char* tmp_end = strchr(path, separator); 392 if (tmp_end == NULL) { 393 expanded_path = add_jars_to_path(expanded_path, path); 394 path = end; 395 } else { 396 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1); 397 memcpy(dirpath, path, tmp_end - path); 398 dirpath[tmp_end - path] = '\0'; 399 expanded_path = add_jars_to_path(expanded_path, dirpath); 400 FREE_C_HEAP_ARRAY(char, dirpath); 401 path = tmp_end + 1; 402 } 403 } 404 _items[_scp_endorsed] = expanded_path; 405 DEBUG_ONLY(_expansion_done = true;) 406 } 407 408 // Combine the bootclasspath elements, some of which may be null, into a single 409 // c-heap-allocated string. 410 char* SysClassPath::combined_path() { 411 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 412 assert(_expansion_done, "must call expand_endorsed() first."); 413 414 size_t lengths[_scp_nitems]; 415 size_t total_len = 0; 416 417 const char separator = *os::path_separator(); 418 419 // Get the lengths. 420 int i; 421 for (i = 0; i < _scp_nitems; ++i) { 422 if (_items[i] != NULL) { 423 lengths[i] = strlen(_items[i]); 424 // Include space for the separator char (or a NULL for the last item). 425 total_len += lengths[i] + 1; 426 } 427 } 428 assert(total_len > 0, "empty sysclasspath not allowed"); 429 430 // Copy the _items to a single string. 431 char* cp = NEW_C_HEAP_ARRAY(char, total_len); 432 char* cp_tmp = cp; 433 for (i = 0; i < _scp_nitems; ++i) { 434 if (_items[i] != NULL) { 435 memcpy(cp_tmp, _items[i], lengths[i]); 436 cp_tmp += lengths[i]; 437 *cp_tmp++ = separator; 438 } 439 } 440 *--cp_tmp = '\0'; // Replace the extra separator. 441 return cp; 442 } 443 444 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 445 char* 446 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 447 char *cp; 448 449 assert(str != NULL, "just checking"); 450 if (path == NULL) { 451 size_t len = strlen(str) + 1; 452 cp = NEW_C_HEAP_ARRAY(char, len); 453 memcpy(cp, str, len); // copy the trailing null 454 } else { 455 const char separator = *os::path_separator(); 456 size_t old_len = strlen(path); 457 size_t str_len = strlen(str); 458 size_t len = old_len + str_len + 2; 459 460 if (prepend) { 461 cp = NEW_C_HEAP_ARRAY(char, len); 462 char* cp_tmp = cp; 463 memcpy(cp_tmp, str, str_len); 464 cp_tmp += str_len; 465 *cp_tmp = separator; 466 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 467 FREE_C_HEAP_ARRAY(char, path); 468 } else { 469 cp = REALLOC_C_HEAP_ARRAY(char, path, len); 470 char* cp_tmp = cp + old_len; 471 *cp_tmp = separator; 472 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 473 } 474 } 475 return cp; 476 } 477 478 // Scan the directory and append any jar or zip files found to path. 479 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 480 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 481 DIR* dir = os::opendir(directory); 482 if (dir == NULL) return path; 483 484 char dir_sep[2] = { '\0', '\0' }; 485 size_t directory_len = strlen(directory); 486 const char fileSep = *os::file_separator(); 487 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 488 489 /* Scan the directory for jars/zips, appending them to path. */ 490 struct dirent *entry; 491 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory)); 492 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 493 const char* name = entry->d_name; 494 const char* ext = name + strlen(name) - 4; 495 bool isJarOrZip = ext > name && 496 (os::file_name_strcmp(ext, ".jar") == 0 || 497 os::file_name_strcmp(ext, ".zip") == 0); 498 if (isJarOrZip) { 499 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name)); 500 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 501 path = add_to_path(path, jarpath, false); 502 FREE_C_HEAP_ARRAY(char, jarpath); 503 } 504 } 505 FREE_C_HEAP_ARRAY(char, dbuf); 506 os::closedir(dir); 507 return path; 508 } 509 510 // Parses a memory size specification string. 511 static bool atomull(const char *s, julong* result) { 512 julong n = 0; 513 int args_read = sscanf(s, os::julong_format_specifier(), &n); 514 if (args_read != 1) { 515 return false; 516 } 517 while (*s != '\0' && isdigit(*s)) { 518 s++; 519 } 520 // 4705540: illegal if more characters are found after the first non-digit 521 if (strlen(s) > 1) { 522 return false; 523 } 524 switch (*s) { 525 case 'T': case 't': 526 *result = n * G * K; 527 // Check for overflow. 528 if (*result/((julong)G * K) != n) return false; 529 return true; 530 case 'G': case 'g': 531 *result = n * G; 532 if (*result/G != n) return false; 533 return true; 534 case 'M': case 'm': 535 *result = n * M; 536 if (*result/M != n) return false; 537 return true; 538 case 'K': case 'k': 539 *result = n * K; 540 if (*result/K != n) return false; 541 return true; 542 case '\0': 543 *result = n; 544 return true; 545 default: 546 return false; 547 } 548 } 549 550 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 551 if (size < min_size) return arg_too_small; 552 // Check that size will fit in a size_t (only relevant on 32-bit) 553 if (size > max_uintx) return arg_too_big; 554 return arg_in_range; 555 } 556 557 // Describe an argument out of range error 558 void Arguments::describe_range_error(ArgsRange errcode) { 559 switch(errcode) { 560 case arg_too_big: 561 jio_fprintf(defaultStream::error_stream(), 562 "The specified size exceeds the maximum " 563 "representable size.\n"); 564 break; 565 case arg_too_small: 566 case arg_unreadable: 567 case arg_in_range: 568 // do nothing for now 569 break; 570 default: 571 ShouldNotReachHere(); 572 } 573 } 574 575 static bool set_bool_flag(char* name, bool value, FlagValueOrigin origin) { 576 return CommandLineFlags::boolAtPut(name, &value, origin); 577 } 578 579 static bool set_fp_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 580 double v; 581 if (sscanf(value, "%lf", &v) != 1) { 582 return false; 583 } 584 585 if (CommandLineFlags::doubleAtPut(name, &v, origin)) { 586 return true; 587 } 588 return false; 589 } 590 591 static bool set_numeric_flag(char* name, char* value, FlagValueOrigin origin) { 592 julong v; 593 intx intx_v; 594 bool is_neg = false; 595 // Check the sign first since atomull() parses only unsigned values. 596 if (*value == '-') { 597 if (!CommandLineFlags::intxAt(name, &intx_v)) { 598 return false; 599 } 600 value++; 601 is_neg = true; 602 } 603 if (!atomull(value, &v)) { 604 return false; 605 } 606 intx_v = (intx) v; 607 if (is_neg) { 608 intx_v = -intx_v; 609 } 610 if (CommandLineFlags::intxAtPut(name, &intx_v, origin)) { 611 return true; 612 } 613 uintx uintx_v = (uintx) v; 614 if (!is_neg && CommandLineFlags::uintxAtPut(name, &uintx_v, origin)) { 615 return true; 616 } 617 uint64_t uint64_t_v = (uint64_t) v; 618 if (!is_neg && CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin)) { 619 return true; 620 } 621 return false; 622 } 623 624 static bool set_string_flag(char* name, const char* value, FlagValueOrigin origin) { 625 if (!CommandLineFlags::ccstrAtPut(name, &value, origin)) return false; 626 // Contract: CommandLineFlags always returns a pointer that needs freeing. 627 FREE_C_HEAP_ARRAY(char, value); 628 return true; 629 } 630 631 static bool append_to_string_flag(char* name, const char* new_value, FlagValueOrigin origin) { 632 const char* old_value = ""; 633 if (!CommandLineFlags::ccstrAt(name, &old_value)) return false; 634 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 635 size_t new_len = strlen(new_value); 636 const char* value; 637 char* free_this_too = NULL; 638 if (old_len == 0) { 639 value = new_value; 640 } else if (new_len == 0) { 641 value = old_value; 642 } else { 643 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1); 644 // each new setting adds another LINE to the switch: 645 sprintf(buf, "%s\n%s", old_value, new_value); 646 value = buf; 647 free_this_too = buf; 648 } 649 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 650 // CommandLineFlags always returns a pointer that needs freeing. 651 FREE_C_HEAP_ARRAY(char, value); 652 if (free_this_too != NULL) { 653 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 654 FREE_C_HEAP_ARRAY(char, free_this_too); 655 } 656 return true; 657 } 658 659 bool Arguments::parse_argument(const char* arg, FlagValueOrigin origin) { 660 661 // range of acceptable characters spelled out for portability reasons 662 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 663 #define BUFLEN 255 664 char name[BUFLEN+1]; 665 char dummy; 666 667 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 668 return set_bool_flag(name, false, origin); 669 } 670 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 671 return set_bool_flag(name, true, origin); 672 } 673 674 char punct; 675 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 676 const char* value = strchr(arg, '=') + 1; 677 Flag* flag = Flag::find_flag(name, strlen(name)); 678 if (flag != NULL && flag->is_ccstr()) { 679 if (flag->ccstr_accumulates()) { 680 return append_to_string_flag(name, value, origin); 681 } else { 682 if (value[0] == '\0') { 683 value = NULL; 684 } 685 return set_string_flag(name, value, origin); 686 } 687 } 688 } 689 690 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 691 const char* value = strchr(arg, '=') + 1; 692 // -XX:Foo:=xxx will reset the string flag to the given value. 693 if (value[0] == '\0') { 694 value = NULL; 695 } 696 return set_string_flag(name, value, origin); 697 } 698 699 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 700 #define SIGNED_NUMBER_RANGE "[-0123456789]" 701 #define NUMBER_RANGE "[0123456789]" 702 char value[BUFLEN + 1]; 703 char value2[BUFLEN + 1]; 704 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 705 // Looks like a floating-point number -- try again with more lenient format string 706 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 707 return set_fp_numeric_flag(name, value, origin); 708 } 709 } 710 711 #define VALUE_RANGE "[-kmgtKMGT0123456789]" 712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 713 return set_numeric_flag(name, value, origin); 714 } 715 716 return false; 717 } 718 719 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 720 assert(bldarray != NULL, "illegal argument"); 721 722 if (arg == NULL) { 723 return; 724 } 725 726 int index = *count; 727 728 // expand the array and add arg to the last element 729 (*count)++; 730 if (*bldarray == NULL) { 731 *bldarray = NEW_C_HEAP_ARRAY(char*, *count); 732 } else { 733 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, *count); 734 } 735 (*bldarray)[index] = strdup(arg); 736 } 737 738 void Arguments::build_jvm_args(const char* arg) { 739 add_string(&_jvm_args_array, &_num_jvm_args, arg); 740 } 741 742 void Arguments::build_jvm_flags(const char* arg) { 743 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 744 } 745 746 // utility function to return a string that concatenates all 747 // strings in a given char** array 748 const char* Arguments::build_resource_string(char** args, int count) { 749 if (args == NULL || count == 0) { 750 return NULL; 751 } 752 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 753 for (int i = 1; i < count; i++) { 754 length += strlen(args[i]) + 1; // add 1 for a space 755 } 756 char* s = NEW_RESOURCE_ARRAY(char, length); 757 strcpy(s, args[0]); 758 for (int j = 1; j < count; j++) { 759 strcat(s, " "); 760 strcat(s, args[j]); 761 } 762 return (const char*) s; 763 } 764 765 void Arguments::print_on(outputStream* st) { 766 st->print_cr("VM Arguments:"); 767 if (num_jvm_flags() > 0) { 768 st->print("jvm_flags: "); print_jvm_flags_on(st); 769 } 770 if (num_jvm_args() > 0) { 771 st->print("jvm_args: "); print_jvm_args_on(st); 772 } 773 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 774 st->print_cr("Launcher Type: %s", _sun_java_launcher); 775 } 776 777 void Arguments::print_jvm_flags_on(outputStream* st) { 778 if (_num_jvm_flags > 0) { 779 for (int i=0; i < _num_jvm_flags; i++) { 780 st->print("%s ", _jvm_flags_array[i]); 781 } 782 st->print_cr(""); 783 } 784 } 785 786 void Arguments::print_jvm_args_on(outputStream* st) { 787 if (_num_jvm_args > 0) { 788 for (int i=0; i < _num_jvm_args; i++) { 789 st->print("%s ", _jvm_args_array[i]); 790 } 791 st->print_cr(""); 792 } 793 } 794 795 bool Arguments::process_argument(const char* arg, 796 jboolean ignore_unrecognized, FlagValueOrigin origin) { 797 798 JDK_Version since = JDK_Version(); 799 800 if (parse_argument(arg, origin)) { 801 // do nothing 802 } else if (is_newly_obsolete(arg, &since)) { 803 enum { bufsize = 256 }; 804 char buffer[bufsize]; 805 since.to_string(buffer, bufsize); 806 jio_fprintf(defaultStream::error_stream(), 807 "Warning: The flag %s has been EOL'd as of %s and will" 808 " be ignored\n", arg, buffer); 809 } else { 810 if (!ignore_unrecognized) { 811 jio_fprintf(defaultStream::error_stream(), 812 "Unrecognized VM option '%s'\n", arg); 813 // allow for commandline "commenting out" options like -XX:#+Verbose 814 if (strlen(arg) == 0 || arg[0] != '#') { 815 return false; 816 } 817 } 818 } 819 return true; 820 } 821 822 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 823 FILE* stream = fopen(file_name, "rb"); 824 if (stream == NULL) { 825 if (should_exist) { 826 jio_fprintf(defaultStream::error_stream(), 827 "Could not open settings file %s\n", file_name); 828 return false; 829 } else { 830 return true; 831 } 832 } 833 834 char token[1024]; 835 int pos = 0; 836 837 bool in_white_space = true; 838 bool in_comment = false; 839 bool in_quote = false; 840 char quote_c = 0; 841 bool result = true; 842 843 int c = getc(stream); 844 while(c != EOF) { 845 if (in_white_space) { 846 if (in_comment) { 847 if (c == '\n') in_comment = false; 848 } else { 849 if (c == '#') in_comment = true; 850 else if (!isspace(c)) { 851 in_white_space = false; 852 token[pos++] = c; 853 } 854 } 855 } else { 856 if (c == '\n' || (!in_quote && isspace(c))) { 857 // token ends at newline, or at unquoted whitespace 858 // this allows a way to include spaces in string-valued options 859 token[pos] = '\0'; 860 logOption(token); 861 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 862 build_jvm_flags(token); 863 pos = 0; 864 in_white_space = true; 865 in_quote = false; 866 } else if (!in_quote && (c == '\'' || c == '"')) { 867 in_quote = true; 868 quote_c = c; 869 } else if (in_quote && (c == quote_c)) { 870 in_quote = false; 871 } else { 872 token[pos++] = c; 873 } 874 } 875 c = getc(stream); 876 } 877 if (pos > 0) { 878 token[pos] = '\0'; 879 result &= process_argument(token, ignore_unrecognized, CONFIG_FILE); 880 build_jvm_flags(token); 881 } 882 fclose(stream); 883 return result; 884 } 885 886 //============================================================================================================= 887 // Parsing of properties (-D) 888 889 const char* Arguments::get_property(const char* key) { 890 return PropertyList_get_value(system_properties(), key); 891 } 892 893 bool Arguments::add_property(const char* prop) { 894 const char* eq = strchr(prop, '='); 895 char* key; 896 // ns must be static--its address may be stored in a SystemProperty object. 897 const static char ns[1] = {0}; 898 char* value = (char *)ns; 899 900 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 901 key = AllocateHeap(key_len + 1, "add_property"); 902 strncpy(key, prop, key_len); 903 key[key_len] = '\0'; 904 905 if (eq != NULL) { 906 size_t value_len = strlen(prop) - key_len - 1; 907 value = AllocateHeap(value_len + 1, "add_property"); 908 strncpy(value, &prop[key_len + 1], value_len + 1); 909 } 910 911 if (strcmp(key, "java.compiler") == 0) { 912 process_java_compiler_argument(value); 913 FreeHeap(key); 914 if (eq != NULL) { 915 FreeHeap(value); 916 } 917 return true; 918 } else if (strcmp(key, "sun.java.command") == 0) { 919 _java_command = value; 920 921 // Record value in Arguments, but let it get passed to Java. 922 } else if (strcmp(key, "sun.java.launcher.pid") == 0) { 923 // launcher.pid property is private and is processed 924 // in process_sun_java_launcher_properties(); 925 // the sun.java.launcher property is passed on to the java application 926 FreeHeap(key); 927 if (eq != NULL) { 928 FreeHeap(value); 929 } 930 return true; 931 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 932 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 933 // its value without going through the property list or making a Java call. 934 _java_vendor_url_bug = value; 935 } else if (strcmp(key, "sun.boot.library.path") == 0) { 936 PropertyList_unique_add(&_system_properties, key, value, true); 937 return true; 938 } 939 // Create new property and add at the end of the list 940 PropertyList_unique_add(&_system_properties, key, value); 941 return true; 942 } 943 944 //=========================================================================================================== 945 // Setting int/mixed/comp mode flags 946 947 void Arguments::set_mode_flags(Mode mode) { 948 // Set up default values for all flags. 949 // If you add a flag to any of the branches below, 950 // add a default value for it here. 951 set_java_compiler(false); 952 _mode = mode; 953 954 // Ensure Agent_OnLoad has the correct initial values. 955 // This may not be the final mode; mode may change later in onload phase. 956 PropertyList_unique_add(&_system_properties, "java.vm.info", 957 (char*)Abstract_VM_Version::vm_info_string(), false); 958 959 UseInterpreter = true; 960 UseCompiler = true; 961 UseLoopCounter = true; 962 963 // Default values may be platform/compiler dependent - 964 // use the saved values 965 ClipInlining = Arguments::_ClipInlining; 966 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 967 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 968 BackgroundCompilation = Arguments::_BackgroundCompilation; 969 970 // Change from defaults based on mode 971 switch (mode) { 972 default: 973 ShouldNotReachHere(); 974 break; 975 case _int: 976 UseCompiler = false; 977 UseLoopCounter = false; 978 AlwaysCompileLoopMethods = false; 979 UseOnStackReplacement = false; 980 break; 981 case _mixed: 982 // same as default 983 break; 984 case _comp: 985 UseInterpreter = false; 986 BackgroundCompilation = false; 987 ClipInlining = false; 988 break; 989 } 990 } 991 992 // Conflict: required to use shared spaces (-Xshare:on), but 993 // incompatible command line options were chosen. 994 995 static void no_shared_spaces() { 996 if (RequireSharedSpaces) { 997 jio_fprintf(defaultStream::error_stream(), 998 "Class data sharing is inconsistent with other specified options.\n"); 999 vm_exit_during_initialization("Unable to use shared archive.", NULL); 1000 } else { 1001 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1002 } 1003 } 1004 1005 void Arguments::check_compressed_oops_compat() { 1006 #ifdef _LP64 1007 assert(UseCompressedOops, "Precondition"); 1008 // Is it on by default or set on ergonomically 1009 bool is_on_by_default = FLAG_IS_DEFAULT(UseCompressedOops) || FLAG_IS_ERGO(UseCompressedOops); 1010 1011 // If dumping an archive or forcing its use, disable compressed oops if possible 1012 if (DumpSharedSpaces || RequireSharedSpaces) { 1013 if (is_on_by_default) { 1014 FLAG_SET_DEFAULT(UseCompressedOops, false); 1015 return; 1016 } else { 1017 vm_exit_during_initialization( 1018 "Class Data Sharing is not supported with compressed oops yet", NULL); 1019 } 1020 } else if (UseSharedSpaces) { 1021 // UseSharedSpaces is on by default. With compressed oops, we turn it off. 1022 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1023 } 1024 #endif 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 // Now make adjustments for CMS 1126 size_t young_gen_per_worker; 1127 intx new_ratio; 1128 size_t min_new_default; 1129 intx tenuring_default; 1130 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0 1131 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) { 1132 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M); 1133 } 1134 young_gen_per_worker = 4*M; 1135 new_ratio = (intx)15; 1136 min_new_default = 4*M; 1137 tenuring_default = (intx)0; 1138 } else { // new defaults: "new" as of 6.0 1139 young_gen_per_worker = CMSYoungGenPerWorker; 1140 new_ratio = (intx)7; 1141 min_new_default = 16*M; 1142 tenuring_default = (intx)4; 1143 } 1144 1145 // Preferred young gen size for "short" pauses 1146 const uintx parallel_gc_threads = 1147 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1148 const size_t preferred_max_new_size_unaligned = 1149 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads); 1150 const size_t preferred_max_new_size = 1151 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1152 1153 // Unless explicitly requested otherwise, size young gen 1154 // for "short" pauses ~ 4M*ParallelGCThreads 1155 1156 // If either MaxNewSize or NewRatio is set on the command line, 1157 // assume the user is trying to set the size of the young gen. 1158 1159 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1160 1161 // Set MaxNewSize to our calculated preferred_max_new_size unless 1162 // NewSize was set on the command line and it is larger than 1163 // preferred_max_new_size. 1164 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1165 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1166 } else { 1167 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1168 } 1169 if (PrintGCDetails && Verbose) { 1170 // Too early to use gclog_or_tty 1171 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1172 } 1173 1174 // Unless explicitly requested otherwise, prefer a large 1175 // Old to Young gen size so as to shift the collection load 1176 // to the old generation concurrent collector 1177 1178 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio) 1179 // then NewSize and OldSize may be calculated. That would 1180 // generally lead to some differences with ParNewGC for which 1181 // there was no obvious reason. Also limit to the case where 1182 // MaxNewSize has not been set. 1183 1184 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio)); 1185 1186 // Code along this path potentially sets NewSize and OldSize 1187 1188 // Calculate the desired minimum size of the young gen but if 1189 // NewSize has been set on the command line, use it here since 1190 // it should be the final value. 1191 size_t min_new; 1192 if (FLAG_IS_DEFAULT(NewSize)) { 1193 min_new = align_size_up(ScaleForWordSize(min_new_default), 1194 os::vm_page_size()); 1195 } else { 1196 min_new = NewSize; 1197 } 1198 size_t prev_initial_size = InitialHeapSize; 1199 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) { 1200 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize); 1201 // Currently minimum size and the initial heap sizes are the same. 1202 set_min_heap_size(InitialHeapSize); 1203 if (PrintGCDetails && Verbose) { 1204 warning("Initial heap size increased to " SIZE_FORMAT " M from " 1205 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.", 1206 InitialHeapSize/M, prev_initial_size/M); 1207 } 1208 } 1209 1210 // MaxHeapSize is aligned down in collectorPolicy 1211 size_t max_heap = 1212 align_size_down(MaxHeapSize, 1213 CardTableRS::ct_max_alignment_constraint()); 1214 1215 if (PrintGCDetails && Verbose) { 1216 // Too early to use gclog_or_tty 1217 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1218 " initial_heap_size: " SIZE_FORMAT 1219 " max_heap: " SIZE_FORMAT, 1220 min_heap_size(), InitialHeapSize, max_heap); 1221 } 1222 if (max_heap > min_new) { 1223 // Unless explicitly requested otherwise, make young gen 1224 // at least min_new, and at most preferred_max_new_size. 1225 if (FLAG_IS_DEFAULT(NewSize)) { 1226 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1227 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1228 if (PrintGCDetails && Verbose) { 1229 // Too early to use gclog_or_tty 1230 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize); 1231 } 1232 } 1233 // Unless explicitly requested otherwise, size old gen 1234 // so that it's at least 3X of NewSize to begin with; 1235 // later NewRatio will decide how it grows; see above. 1236 if (FLAG_IS_DEFAULT(OldSize)) { 1237 if (max_heap > NewSize) { 1238 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize)); 1239 if (PrintGCDetails && Verbose) { 1240 // Too early to use gclog_or_tty 1241 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize); 1242 } 1243 } 1244 } 1245 } 1246 } 1247 // Unless explicitly requested otherwise, definitely 1248 // promote all objects surviving "tenuring_default" scavenges. 1249 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1250 FLAG_IS_DEFAULT(SurvivorRatio)) { 1251 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1252 } 1253 // If we decided above (or user explicitly requested) 1254 // `promote all' (via MaxTenuringThreshold := 0), 1255 // prefer minuscule survivor spaces so as not to waste 1256 // space for (non-existent) survivors 1257 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1258 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1259 } 1260 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1261 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1262 // This is done in order to make ParNew+CMS configuration to work 1263 // with YoungPLABSize and OldPLABSize options. 1264 // See CR 6362902. 1265 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1266 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1267 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1268 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1269 // the value (either from the command line or ergonomics) of 1270 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1271 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1272 } else { 1273 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1274 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1275 // we'll let it to take precedence. 1276 jio_fprintf(defaultStream::error_stream(), 1277 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1278 " options are specified for the CMS collector." 1279 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1280 } 1281 } 1282 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1283 // OldPLAB sizing manually turned off: Use a larger default setting, 1284 // unless it was manually specified. This is because a too-low value 1285 // will slow down scavenges. 1286 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1287 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1288 } 1289 } 1290 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1291 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1292 // If either of the static initialization defaults have changed, note this 1293 // modification. 1294 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1295 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1296 } 1297 if (PrintGCDetails && Verbose) { 1298 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1299 MarkStackSize / K, MarkStackSizeMax / K); 1300 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1301 } 1302 } 1303 #endif // KERNEL 1304 1305 void set_object_alignment() { 1306 // Object alignment. 1307 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1308 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1309 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1310 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1311 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1312 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1313 1314 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1315 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1316 1317 // Oop encoding heap max 1318 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1319 1320 #ifndef KERNEL 1321 // Set CMS global values 1322 CompactibleFreeListSpace::set_cms_values(); 1323 #endif // KERNEL 1324 } 1325 1326 bool verify_object_alignment() { 1327 // Object alignment. 1328 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1329 jio_fprintf(defaultStream::error_stream(), 1330 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1331 (int)ObjectAlignmentInBytes); 1332 return false; 1333 } 1334 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1335 jio_fprintf(defaultStream::error_stream(), 1336 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1337 (int)ObjectAlignmentInBytes, BytesPerLong); 1338 return false; 1339 } 1340 // It does not make sense to have big object alignment 1341 // since a space lost due to alignment will be greater 1342 // then a saved space from compressed oops. 1343 if ((int)ObjectAlignmentInBytes > 256) { 1344 jio_fprintf(defaultStream::error_stream(), 1345 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n", 1346 (int)ObjectAlignmentInBytes); 1347 return false; 1348 } 1349 // In case page size is very small. 1350 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1351 jio_fprintf(defaultStream::error_stream(), 1352 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n", 1353 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1354 return false; 1355 } 1356 return true; 1357 } 1358 1359 inline uintx max_heap_for_compressed_oops() { 1360 // Avoid sign flip. 1361 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) { 1362 return 0; 1363 } 1364 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1365 NOT_LP64(ShouldNotReachHere(); return 0); 1366 } 1367 1368 bool Arguments::should_auto_select_low_pause_collector() { 1369 if (UseAutoGCSelectPolicy && 1370 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1371 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1372 if (PrintGCDetails) { 1373 // Cannot use gclog_or_tty yet. 1374 tty->print_cr("Automatic selection of the low pause collector" 1375 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1376 } 1377 return true; 1378 } 1379 return false; 1380 } 1381 1382 void Arguments::set_ergonomics_flags() { 1383 // Parallel GC is not compatible with sharing. If one specifies 1384 // that they want sharing explicitly, do not set ergonomics flags. 1385 if (DumpSharedSpaces || ForceSharedSpaces) { 1386 return; 1387 } 1388 1389 if (os::is_server_class_machine() && !force_client_mode ) { 1390 // If no other collector is requested explicitly, 1391 // let the VM select the collector based on 1392 // machine class and automatic selection policy. 1393 if (!UseSerialGC && 1394 !UseConcMarkSweepGC && 1395 !UseG1GC && 1396 !UseParNewGC && 1397 !DumpSharedSpaces && 1398 FLAG_IS_DEFAULT(UseParallelGC)) { 1399 if (should_auto_select_low_pause_collector()) { 1400 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1401 } else { 1402 FLAG_SET_ERGO(bool, UseParallelGC, true); 1403 } 1404 no_shared_spaces(); 1405 } 1406 } 1407 1408 #ifndef ZERO 1409 #ifdef _LP64 1410 // Check that UseCompressedOops can be set with the max heap size allocated 1411 // by ergonomics. 1412 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1413 #if !defined(COMPILER1) || defined(TIERED) 1414 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1415 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1416 } 1417 #endif 1418 #ifdef _WIN64 1419 if (UseLargePages && UseCompressedOops) { 1420 // Cannot allocate guard pages for implicit checks in indexed addressing 1421 // mode, when large pages are specified on windows. 1422 // This flag could be switched ON if narrow oop base address is set to 0, 1423 // see code in Universe::initialize_heap(). 1424 Universe::set_narrow_oop_use_implicit_null_checks(false); 1425 } 1426 #endif // _WIN64 1427 } else { 1428 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1429 warning("Max heap size too large for Compressed Oops"); 1430 FLAG_SET_DEFAULT(UseCompressedOops, false); 1431 } 1432 } 1433 // Also checks that certain machines are slower with compressed oops 1434 // in vm_version initialization code. 1435 #endif // _LP64 1436 #endif // !ZERO 1437 } 1438 1439 void Arguments::set_parallel_gc_flags() { 1440 assert(UseParallelGC || UseParallelOldGC, "Error"); 1441 // If parallel old was requested, automatically enable parallel scavenge. 1442 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) { 1443 FLAG_SET_DEFAULT(UseParallelGC, true); 1444 } 1445 1446 // If no heap maximum was requested explicitly, use some reasonable fraction 1447 // of the physical memory, up to a maximum of 1GB. 1448 if (UseParallelGC) { 1449 FLAG_SET_ERGO(uintx, ParallelGCThreads, 1450 Abstract_VM_Version::parallel_worker_threads()); 1451 1452 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1453 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1454 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1455 // See CR 6362902 for details. 1456 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1457 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1458 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1459 } 1460 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1461 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1462 } 1463 } 1464 1465 if (UseParallelOldGC) { 1466 // Par compact uses lower default values since they are treated as 1467 // minimums. These are different defaults because of the different 1468 // interpretation and are not ergonomically set. 1469 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1470 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1471 } 1472 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1473 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1474 } 1475 } 1476 } 1477 } 1478 1479 void Arguments::set_g1_gc_flags() { 1480 assert(UseG1GC, "Error"); 1481 #ifdef COMPILER1 1482 FastTLABRefill = false; 1483 #endif 1484 FLAG_SET_DEFAULT(ParallelGCThreads, 1485 Abstract_VM_Version::parallel_worker_threads()); 1486 if (ParallelGCThreads == 0) { 1487 FLAG_SET_DEFAULT(ParallelGCThreads, 1488 Abstract_VM_Version::parallel_worker_threads()); 1489 } 1490 no_shared_spaces(); 1491 1492 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1493 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1494 } 1495 if (PrintGCDetails && Verbose) { 1496 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1497 MarkStackSize / K, MarkStackSizeMax / K); 1498 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1499 } 1500 1501 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1502 // In G1, we want the default GC overhead goal to be higher than 1503 // say in PS. So we set it here to 10%. Otherwise the heap might 1504 // be expanded more aggressively than we would like it to. In 1505 // fact, even 10% seems to not be high enough in some cases 1506 // (especially small GC stress tests that the main thing they do 1507 // is allocation). We might consider increase it further. 1508 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1509 } 1510 } 1511 1512 void Arguments::set_heap_size() { 1513 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1514 // Deprecated flag 1515 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1516 } 1517 1518 const julong phys_mem = 1519 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1520 : (julong)MaxRAM; 1521 1522 // If the maximum heap size has not been set with -Xmx, 1523 // then set it as fraction of the size of physical memory, 1524 // respecting the maximum and minimum sizes of the heap. 1525 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1526 julong reasonable_max = phys_mem / MaxRAMFraction; 1527 1528 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1529 // Small physical memory, so use a minimum fraction of it for the heap 1530 reasonable_max = phys_mem / MinRAMFraction; 1531 } else { 1532 // Not-small physical memory, so require a heap at least 1533 // as large as MaxHeapSize 1534 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1535 } 1536 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1537 // Limit the heap size to ErgoHeapSizeLimit 1538 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1539 } 1540 if (UseCompressedOops) { 1541 // Limit the heap size to the maximum possible when using compressed oops 1542 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1543 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1544 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1545 // but it should be not less than default MaxHeapSize. 1546 max_coop_heap -= HeapBaseMinAddress; 1547 } 1548 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1549 } 1550 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1551 1552 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1553 // An initial heap size was specified on the command line, 1554 // so be sure that the maximum size is consistent. Done 1555 // after call to allocatable_physical_memory because that 1556 // method might reduce the allocation size. 1557 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1558 } 1559 1560 if (PrintGCDetails && Verbose) { 1561 // Cannot use gclog_or_tty yet. 1562 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1563 } 1564 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1565 } 1566 1567 // If the initial_heap_size has not been set with InitialHeapSize 1568 // or -Xms, then set it as fraction of the size of physical memory, 1569 // respecting the maximum and minimum sizes of the heap. 1570 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1571 julong reasonable_minimum = (julong)(OldSize + NewSize); 1572 1573 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1574 1575 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1576 1577 julong reasonable_initial = phys_mem / InitialRAMFraction; 1578 1579 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1580 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1581 1582 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1583 1584 if (PrintGCDetails && Verbose) { 1585 // Cannot use gclog_or_tty yet. 1586 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1587 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1588 } 1589 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1590 set_min_heap_size((uintx)reasonable_minimum); 1591 } 1592 } 1593 1594 // This must be called after ergonomics because we want bytecode rewriting 1595 // if the server compiler is used, or if UseSharedSpaces is disabled. 1596 void Arguments::set_bytecode_flags() { 1597 // Better not attempt to store into a read-only space. 1598 if (UseSharedSpaces) { 1599 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1600 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1601 } 1602 1603 if (!RewriteBytecodes) { 1604 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1605 } 1606 } 1607 1608 // Aggressive optimization flags -XX:+AggressiveOpts 1609 void Arguments::set_aggressive_opts_flags() { 1610 #ifdef COMPILER2 1611 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1612 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1613 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1614 } 1615 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1616 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1617 } 1618 1619 // Feed the cache size setting into the JDK 1620 char buffer[1024]; 1621 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1622 add_property(buffer); 1623 } 1624 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1625 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1626 } 1627 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1628 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1629 } 1630 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) { 1631 FLAG_SET_DEFAULT(OptimizeStringConcat, true); 1632 } 1633 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) { 1634 FLAG_SET_DEFAULT(OptimizeFill, true); 1635 } 1636 #endif 1637 1638 if (AggressiveOpts) { 1639 // Sample flag setting code 1640 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1641 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1642 // } 1643 } 1644 } 1645 1646 //=========================================================================================================== 1647 // Parsing of java.compiler property 1648 1649 void Arguments::process_java_compiler_argument(char* arg) { 1650 // For backwards compatibility, Djava.compiler=NONE or "" 1651 // causes us to switch to -Xint mode UNLESS -Xdebug 1652 // is also specified. 1653 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1654 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1655 } 1656 } 1657 1658 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1659 _sun_java_launcher = strdup(launcher); 1660 } 1661 1662 bool Arguments::created_by_java_launcher() { 1663 assert(_sun_java_launcher != NULL, "property must have value"); 1664 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1665 } 1666 1667 //=========================================================================================================== 1668 // Parsing of main arguments 1669 1670 bool Arguments::verify_interval(uintx val, uintx min, 1671 uintx max, const char* name) { 1672 // Returns true iff value is in the inclusive interval [min..max] 1673 // false, otherwise. 1674 if (val >= min && val <= max) { 1675 return true; 1676 } 1677 jio_fprintf(defaultStream::error_stream(), 1678 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1679 " and " UINTX_FORMAT "\n", 1680 name, val, min, max); 1681 return false; 1682 } 1683 1684 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1685 // Returns true if given value is greater than specified min threshold 1686 // false, otherwise. 1687 if (val >= min ) { 1688 return true; 1689 } 1690 jio_fprintf(defaultStream::error_stream(), 1691 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n", 1692 name, val, min); 1693 return false; 1694 } 1695 1696 bool Arguments::verify_percentage(uintx value, const char* name) { 1697 if (value <= 100) { 1698 return true; 1699 } 1700 jio_fprintf(defaultStream::error_stream(), 1701 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1702 name, value); 1703 return false; 1704 } 1705 1706 static void force_serial_gc() { 1707 FLAG_SET_DEFAULT(UseSerialGC, true); 1708 FLAG_SET_DEFAULT(UseParNewGC, false); 1709 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1710 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1711 FLAG_SET_DEFAULT(UseParallelGC, false); 1712 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1713 FLAG_SET_DEFAULT(UseG1GC, false); 1714 } 1715 1716 static bool verify_serial_gc_flags() { 1717 return (UseSerialGC && 1718 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1719 UseParallelGC || UseParallelOldGC)); 1720 } 1721 1722 // Check consistency of GC selection 1723 bool Arguments::check_gc_consistency() { 1724 bool status = true; 1725 // Ensure that the user has not selected conflicting sets 1726 // of collectors. [Note: this check is merely a user convenience; 1727 // collectors over-ride each other so that only a non-conflicting 1728 // set is selected; however what the user gets is not what they 1729 // may have expected from the combination they asked for. It's 1730 // better to reduce user confusion by not allowing them to 1731 // select conflicting combinations. 1732 uint i = 0; 1733 if (UseSerialGC) i++; 1734 if (UseConcMarkSweepGC || UseParNewGC) i++; 1735 if (UseParallelGC || UseParallelOldGC) i++; 1736 if (UseG1GC) i++; 1737 if (i > 1) { 1738 jio_fprintf(defaultStream::error_stream(), 1739 "Conflicting collector combinations in option list; " 1740 "please refer to the release notes for the combinations " 1741 "allowed\n"); 1742 status = false; 1743 } 1744 1745 return status; 1746 } 1747 1748 // Check stack pages settings 1749 bool Arguments::check_stack_pages() 1750 { 1751 bool status = true; 1752 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1753 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1754 // greater stack shadow pages can't generate instruction to bang stack 1755 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1756 return status; 1757 } 1758 1759 // Check the consistency of vm_init_args 1760 bool Arguments::check_vm_args_consistency() { 1761 // Method for adding checks for flag consistency. 1762 // The intent is to warn the user of all possible conflicts, 1763 // before returning an error. 1764 // Note: Needs platform-dependent factoring. 1765 bool status = true; 1766 1767 #if ( (defined(COMPILER2) && defined(SPARC))) 1768 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1769 // on sparc doesn't require generation of a stub as is the case on, e.g., 1770 // x86. Normally, VM_Version_init must be called from init_globals in 1771 // init.cpp, which is called by the initial java thread *after* arguments 1772 // have been parsed. VM_Version_init gets called twice on sparc. 1773 extern void VM_Version_init(); 1774 VM_Version_init(); 1775 if (!VM_Version::has_v9()) { 1776 jio_fprintf(defaultStream::error_stream(), 1777 "V8 Machine detected, Server requires V9\n"); 1778 status = false; 1779 } 1780 #endif /* COMPILER2 && SPARC */ 1781 1782 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1783 // builds so the cost of stack banging can be measured. 1784 #if (defined(PRODUCT) && defined(SOLARIS)) 1785 if (!UseBoundThreads && !UseStackBanging) { 1786 jio_fprintf(defaultStream::error_stream(), 1787 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1788 1789 status = false; 1790 } 1791 #endif 1792 1793 if (TLABRefillWasteFraction == 0) { 1794 jio_fprintf(defaultStream::error_stream(), 1795 "TLABRefillWasteFraction should be a denominator, " 1796 "not " SIZE_FORMAT "\n", 1797 TLABRefillWasteFraction); 1798 status = false; 1799 } 1800 1801 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1802 "AdaptiveSizePolicyWeight"); 1803 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1804 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1805 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1806 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1807 1808 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1809 jio_fprintf(defaultStream::error_stream(), 1810 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1811 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1812 MinHeapFreeRatio, MaxHeapFreeRatio); 1813 status = false; 1814 } 1815 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1816 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1817 1818 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1819 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1820 } 1821 1822 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1823 // Settings to encourage splitting. 1824 if (!FLAG_IS_CMDLINE(NewRatio)) { 1825 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1826 } 1827 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1828 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1829 } 1830 } 1831 1832 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1833 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1834 if (GCTimeLimit == 100) { 1835 // Turn off gc-overhead-limit-exceeded checks 1836 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1837 } 1838 1839 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1840 1841 // Check whether user-specified sharing option conflicts with GC or page size. 1842 // Both sharing and large pages are enabled by default on some platforms; 1843 // large pages override sharing only if explicitly set on the command line. 1844 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode || 1845 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC || 1846 UseLargePages && FLAG_IS_CMDLINE(UseLargePages); 1847 if (cannot_share) { 1848 // Either force sharing on by forcing the other options off, or 1849 // force sharing off. 1850 if (DumpSharedSpaces || ForceSharedSpaces) { 1851 jio_fprintf(defaultStream::error_stream(), 1852 "Using Serial GC and default page size because of %s\n", 1853 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump"); 1854 force_serial_gc(); 1855 FLAG_SET_DEFAULT(UseLargePages, false); 1856 } else { 1857 if (UseSharedSpaces && Verbose) { 1858 jio_fprintf(defaultStream::error_stream(), 1859 "Turning off use of shared archive because of " 1860 "choice of garbage collector or large pages\n"); 1861 } 1862 no_shared_spaces(); 1863 } 1864 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) { 1865 FLAG_SET_DEFAULT(UseLargePages, false); 1866 } 1867 1868 status = status && check_gc_consistency(); 1869 status = status && check_stack_pages(); 1870 1871 if (_has_alloc_profile) { 1872 if (UseParallelGC || UseParallelOldGC) { 1873 jio_fprintf(defaultStream::error_stream(), 1874 "error: invalid argument combination.\n" 1875 "Allocation profiling (-Xaprof) cannot be used together with " 1876 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1877 status = false; 1878 } 1879 if (UseConcMarkSweepGC) { 1880 jio_fprintf(defaultStream::error_stream(), 1881 "error: invalid argument combination.\n" 1882 "Allocation profiling (-Xaprof) cannot be used together with " 1883 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1884 status = false; 1885 } 1886 } 1887 1888 if (CMSIncrementalMode) { 1889 if (!UseConcMarkSweepGC) { 1890 jio_fprintf(defaultStream::error_stream(), 1891 "error: invalid argument combination.\n" 1892 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1893 "selected in order\nto use CMSIncrementalMode.\n"); 1894 status = false; 1895 } else { 1896 status = status && verify_percentage(CMSIncrementalDutyCycle, 1897 "CMSIncrementalDutyCycle"); 1898 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1899 "CMSIncrementalDutyCycleMin"); 1900 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1901 "CMSIncrementalSafetyFactor"); 1902 status = status && verify_percentage(CMSIncrementalOffset, 1903 "CMSIncrementalOffset"); 1904 status = status && verify_percentage(CMSExpAvgFactor, 1905 "CMSExpAvgFactor"); 1906 // If it was not set on the command line, set 1907 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1908 if (CMSInitiatingOccupancyFraction < 0) { 1909 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1910 } 1911 } 1912 } 1913 1914 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1915 // insists that we hold the requisite locks so that the iteration is 1916 // MT-safe. For the verification at start-up and shut-down, we don't 1917 // yet have a good way of acquiring and releasing these locks, 1918 // which are not visible at the CollectedHeap level. We want to 1919 // be able to acquire these locks and then do the iteration rather 1920 // than just disable the lock verification. This will be fixed under 1921 // bug 4788986. 1922 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1923 if (VerifyGCStartAt == 0) { 1924 warning("Heap verification at start-up disabled " 1925 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1926 VerifyGCStartAt = 1; // Disable verification at start-up 1927 } 1928 if (VerifyBeforeExit) { 1929 warning("Heap verification at shutdown disabled " 1930 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1931 VerifyBeforeExit = false; // Disable verification at shutdown 1932 } 1933 } 1934 1935 // Note: only executed in non-PRODUCT mode 1936 if (!UseAsyncConcMarkSweepGC && 1937 (ExplicitGCInvokesConcurrent || 1938 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1939 jio_fprintf(defaultStream::error_stream(), 1940 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1941 " with -UseAsyncConcMarkSweepGC"); 1942 status = false; 1943 } 1944 1945 #ifndef SERIALGC 1946 if (UseG1GC) { 1947 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1948 "InitiatingHeapOccupancyPercent"); 1949 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1950 "G1RefProcDrainInterval"); 1951 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1952 "G1ConcMarkStepDurationMillis"); 1953 } 1954 #endif 1955 1956 status = status && verify_interval(RefDiscoveryPolicy, 1957 ReferenceProcessor::DiscoveryPolicyMin, 1958 ReferenceProcessor::DiscoveryPolicyMax, 1959 "RefDiscoveryPolicy"); 1960 1961 // Limit the lower bound of this flag to 1 as it is used in a division 1962 // expression. 1963 status = status && verify_interval(TLABWasteTargetPercent, 1964 1, 100, "TLABWasteTargetPercent"); 1965 1966 status = status && verify_object_alignment(); 1967 1968 return status; 1969 } 1970 1971 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1972 const char* option_type) { 1973 if (ignore) return false; 1974 1975 const char* spacer = " "; 1976 if (option_type == NULL) { 1977 option_type = ++spacer; // Set both to the empty string. 1978 } 1979 1980 if (os::obsolete_option(option)) { 1981 jio_fprintf(defaultStream::error_stream(), 1982 "Obsolete %s%soption: %s\n", option_type, spacer, 1983 option->optionString); 1984 return false; 1985 } else { 1986 jio_fprintf(defaultStream::error_stream(), 1987 "Unrecognized %s%soption: %s\n", option_type, spacer, 1988 option->optionString); 1989 return true; 1990 } 1991 } 1992 1993 static const char* user_assertion_options[] = { 1994 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1995 }; 1996 1997 static const char* system_assertion_options[] = { 1998 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1999 }; 2000 2001 // Return true if any of the strings in null-terminated array 'names' matches. 2002 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2003 // the option must match exactly. 2004 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2005 bool tail_allowed) { 2006 for (/* empty */; *names != NULL; ++names) { 2007 if (match_option(option, *names, tail)) { 2008 if (**tail == '\0' || tail_allowed && **tail == ':') { 2009 return true; 2010 } 2011 } 2012 } 2013 return false; 2014 } 2015 2016 bool Arguments::parse_uintx(const char* value, 2017 uintx* uintx_arg, 2018 uintx min_size) { 2019 2020 // Check the sign first since atomull() parses only unsigned values. 2021 bool value_is_positive = !(*value == '-'); 2022 2023 if (value_is_positive) { 2024 julong n; 2025 bool good_return = atomull(value, &n); 2026 if (good_return) { 2027 bool above_minimum = n >= min_size; 2028 bool value_is_too_large = n > max_uintx; 2029 2030 if (above_minimum && !value_is_too_large) { 2031 *uintx_arg = n; 2032 return true; 2033 } 2034 } 2035 } 2036 return false; 2037 } 2038 2039 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2040 julong* long_arg, 2041 julong min_size) { 2042 if (!atomull(s, long_arg)) return arg_unreadable; 2043 return check_memory_size(*long_arg, min_size); 2044 } 2045 2046 // Parse JavaVMInitArgs structure 2047 2048 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2049 // For components of the system classpath. 2050 SysClassPath scp(Arguments::get_sysclasspath()); 2051 bool scp_assembly_required = false; 2052 2053 // Save default settings for some mode flags 2054 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2055 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2056 Arguments::_ClipInlining = ClipInlining; 2057 Arguments::_BackgroundCompilation = BackgroundCompilation; 2058 2059 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2060 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2061 if (result != JNI_OK) { 2062 return result; 2063 } 2064 2065 // Parse JavaVMInitArgs structure passed in 2066 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2067 if (result != JNI_OK) { 2068 return result; 2069 } 2070 2071 if (AggressiveOpts) { 2072 // Insert alt-rt.jar between user-specified bootclasspath 2073 // prefix and the default bootclasspath. os::set_boot_path() 2074 // uses meta_index_dir as the default bootclasspath directory. 2075 const char* altclasses_jar = "alt-rt.jar"; 2076 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2077 strlen(altclasses_jar); 2078 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 2079 strcpy(altclasses_path, get_meta_index_dir()); 2080 strcat(altclasses_path, altclasses_jar); 2081 scp.add_suffix_to_prefix(altclasses_path); 2082 scp_assembly_required = true; 2083 FREE_C_HEAP_ARRAY(char, altclasses_path); 2084 } 2085 2086 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2087 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2088 if (result != JNI_OK) { 2089 return result; 2090 } 2091 2092 // Do final processing now that all arguments have been parsed 2093 result = finalize_vm_init_args(&scp, scp_assembly_required); 2094 if (result != JNI_OK) { 2095 return result; 2096 } 2097 2098 return JNI_OK; 2099 } 2100 2101 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2102 SysClassPath* scp_p, 2103 bool* scp_assembly_required_p, 2104 FlagValueOrigin origin) { 2105 // Remaining part of option string 2106 const char* tail; 2107 2108 // iterate over arguments 2109 for (int index = 0; index < args->nOptions; index++) { 2110 bool is_absolute_path = false; // for -agentpath vs -agentlib 2111 2112 const JavaVMOption* option = args->options + index; 2113 2114 if (!match_option(option, "-Djava.class.path", &tail) && 2115 !match_option(option, "-Dsun.java.command", &tail) && 2116 !match_option(option, "-Dsun.java.launcher", &tail)) { 2117 2118 // add all jvm options to the jvm_args string. This string 2119 // is used later to set the java.vm.args PerfData string constant. 2120 // the -Djava.class.path and the -Dsun.java.command options are 2121 // omitted from jvm_args string as each have their own PerfData 2122 // string constant object. 2123 build_jvm_args(option->optionString); 2124 } 2125 2126 // -verbose:[class/gc/jni] 2127 if (match_option(option, "-verbose", &tail)) { 2128 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2129 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2130 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2131 } else if (!strcmp(tail, ":gc")) { 2132 FLAG_SET_CMDLINE(bool, PrintGC, true); 2133 } else if (!strcmp(tail, ":jni")) { 2134 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2135 } 2136 // -da / -ea / -disableassertions / -enableassertions 2137 // These accept an optional class/package name separated by a colon, e.g., 2138 // -da:java.lang.Thread. 2139 } else if (match_option(option, user_assertion_options, &tail, true)) { 2140 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2141 if (*tail == '\0') { 2142 JavaAssertions::setUserClassDefault(enable); 2143 } else { 2144 assert(*tail == ':', "bogus match by match_option()"); 2145 JavaAssertions::addOption(tail + 1, enable); 2146 } 2147 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2148 } else if (match_option(option, system_assertion_options, &tail, false)) { 2149 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2150 JavaAssertions::setSystemClassDefault(enable); 2151 // -bootclasspath: 2152 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2153 scp_p->reset_path(tail); 2154 *scp_assembly_required_p = true; 2155 // -bootclasspath/a: 2156 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2157 scp_p->add_suffix(tail); 2158 *scp_assembly_required_p = true; 2159 // -bootclasspath/p: 2160 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2161 scp_p->add_prefix(tail); 2162 *scp_assembly_required_p = true; 2163 // -Xrun 2164 } else if (match_option(option, "-Xrun", &tail)) { 2165 if (tail != NULL) { 2166 const char* pos = strchr(tail, ':'); 2167 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2168 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2169 name[len] = '\0'; 2170 2171 char *options = NULL; 2172 if(pos != NULL) { 2173 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2174 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 2175 } 2176 #ifdef JVMTI_KERNEL 2177 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2178 warning("profiling and debugging agents are not supported with Kernel VM"); 2179 } else 2180 #endif // JVMTI_KERNEL 2181 add_init_library(name, options); 2182 } 2183 // -agentlib and -agentpath 2184 } else if (match_option(option, "-agentlib:", &tail) || 2185 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2186 if(tail != NULL) { 2187 const char* pos = strchr(tail, '='); 2188 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2189 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2190 name[len] = '\0'; 2191 2192 char *options = NULL; 2193 if(pos != NULL) { 2194 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 2195 } 2196 #ifdef JVMTI_KERNEL 2197 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2198 warning("profiling and debugging agents are not supported with Kernel VM"); 2199 } else 2200 #endif // JVMTI_KERNEL 2201 add_init_agent(name, options, is_absolute_path); 2202 2203 } 2204 // -javaagent 2205 } else if (match_option(option, "-javaagent:", &tail)) { 2206 if(tail != NULL) { 2207 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 2208 add_init_agent("instrument", options, false); 2209 } 2210 // -Xnoclassgc 2211 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2212 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2213 // -Xincgc: i-CMS 2214 } else if (match_option(option, "-Xincgc", &tail)) { 2215 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2216 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2217 // -Xnoincgc: no i-CMS 2218 } else if (match_option(option, "-Xnoincgc", &tail)) { 2219 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2220 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2221 // -Xconcgc 2222 } else if (match_option(option, "-Xconcgc", &tail)) { 2223 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2224 // -Xnoconcgc 2225 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2226 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2227 // -Xbatch 2228 } else if (match_option(option, "-Xbatch", &tail)) { 2229 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2230 // -Xmn for compatibility with other JVM vendors 2231 } else if (match_option(option, "-Xmn", &tail)) { 2232 julong long_initial_eden_size = 0; 2233 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2234 if (errcode != arg_in_range) { 2235 jio_fprintf(defaultStream::error_stream(), 2236 "Invalid initial eden size: %s\n", option->optionString); 2237 describe_range_error(errcode); 2238 return JNI_EINVAL; 2239 } 2240 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2241 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2242 // -Xms 2243 } else if (match_option(option, "-Xms", &tail)) { 2244 julong long_initial_heap_size = 0; 2245 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2246 if (errcode != arg_in_range) { 2247 jio_fprintf(defaultStream::error_stream(), 2248 "Invalid initial heap size: %s\n", option->optionString); 2249 describe_range_error(errcode); 2250 return JNI_EINVAL; 2251 } 2252 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2253 // Currently the minimum size and the initial heap sizes are the same. 2254 set_min_heap_size(InitialHeapSize); 2255 // -Xmx 2256 } else if (match_option(option, "-Xmx", &tail)) { 2257 julong long_max_heap_size = 0; 2258 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2259 if (errcode != arg_in_range) { 2260 jio_fprintf(defaultStream::error_stream(), 2261 "Invalid maximum heap size: %s\n", option->optionString); 2262 describe_range_error(errcode); 2263 return JNI_EINVAL; 2264 } 2265 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2266 // Xmaxf 2267 } else if (match_option(option, "-Xmaxf", &tail)) { 2268 int maxf = (int)(atof(tail) * 100); 2269 if (maxf < 0 || maxf > 100) { 2270 jio_fprintf(defaultStream::error_stream(), 2271 "Bad max heap free percentage size: %s\n", 2272 option->optionString); 2273 return JNI_EINVAL; 2274 } else { 2275 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2276 } 2277 // Xminf 2278 } else if (match_option(option, "-Xminf", &tail)) { 2279 int minf = (int)(atof(tail) * 100); 2280 if (minf < 0 || minf > 100) { 2281 jio_fprintf(defaultStream::error_stream(), 2282 "Bad min heap free percentage size: %s\n", 2283 option->optionString); 2284 return JNI_EINVAL; 2285 } else { 2286 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2287 } 2288 // -Xss 2289 } else if (match_option(option, "-Xss", &tail)) { 2290 julong long_ThreadStackSize = 0; 2291 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2292 if (errcode != arg_in_range) { 2293 jio_fprintf(defaultStream::error_stream(), 2294 "Invalid thread stack size: %s\n", option->optionString); 2295 describe_range_error(errcode); 2296 return JNI_EINVAL; 2297 } 2298 // Internally track ThreadStackSize in units of 1024 bytes. 2299 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2300 round_to((int)long_ThreadStackSize, K) / K); 2301 // -Xoss 2302 } else if (match_option(option, "-Xoss", &tail)) { 2303 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2304 // -Xmaxjitcodesize 2305 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2306 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2307 julong long_ReservedCodeCacheSize = 0; 2308 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2309 (size_t)InitialCodeCacheSize); 2310 if (errcode != arg_in_range) { 2311 jio_fprintf(defaultStream::error_stream(), 2312 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2313 option->optionString, InitialCodeCacheSize/K); 2314 describe_range_error(errcode); 2315 return JNI_EINVAL; 2316 } 2317 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2318 // -green 2319 } else if (match_option(option, "-green", &tail)) { 2320 jio_fprintf(defaultStream::error_stream(), 2321 "Green threads support not available\n"); 2322 return JNI_EINVAL; 2323 // -native 2324 } else if (match_option(option, "-native", &tail)) { 2325 // HotSpot always uses native threads, ignore silently for compatibility 2326 // -Xsqnopause 2327 } else if (match_option(option, "-Xsqnopause", &tail)) { 2328 // EVM option, ignore silently for compatibility 2329 // -Xrs 2330 } else if (match_option(option, "-Xrs", &tail)) { 2331 // Classic/EVM option, new functionality 2332 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2333 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2334 // change default internal VM signals used - lower case for back compat 2335 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2336 // -Xoptimize 2337 } else if (match_option(option, "-Xoptimize", &tail)) { 2338 // EVM option, ignore silently for compatibility 2339 // -Xprof 2340 } else if (match_option(option, "-Xprof", &tail)) { 2341 #ifndef FPROF_KERNEL 2342 _has_profile = true; 2343 #else // FPROF_KERNEL 2344 // do we have to exit? 2345 warning("Kernel VM does not support flat profiling."); 2346 #endif // FPROF_KERNEL 2347 // -Xaprof 2348 } else if (match_option(option, "-Xaprof", &tail)) { 2349 _has_alloc_profile = true; 2350 // -Xconcurrentio 2351 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2352 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2353 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2354 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2355 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2356 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2357 2358 // -Xinternalversion 2359 } else if (match_option(option, "-Xinternalversion", &tail)) { 2360 jio_fprintf(defaultStream::output_stream(), "%s\n", 2361 VM_Version::internal_vm_info_string()); 2362 vm_exit(0); 2363 #ifndef PRODUCT 2364 // -Xprintflags 2365 } else if (match_option(option, "-Xprintflags", &tail)) { 2366 CommandLineFlags::printFlags(); 2367 vm_exit(0); 2368 #endif 2369 // -D 2370 } else if (match_option(option, "-D", &tail)) { 2371 if (!add_property(tail)) { 2372 return JNI_ENOMEM; 2373 } 2374 // Out of the box management support 2375 if (match_option(option, "-Dcom.sun.management", &tail)) { 2376 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2377 } 2378 // -Xint 2379 } else if (match_option(option, "-Xint", &tail)) { 2380 set_mode_flags(_int); 2381 // -Xmixed 2382 } else if (match_option(option, "-Xmixed", &tail)) { 2383 set_mode_flags(_mixed); 2384 // -Xcomp 2385 } else if (match_option(option, "-Xcomp", &tail)) { 2386 // for testing the compiler; turn off all flags that inhibit compilation 2387 set_mode_flags(_comp); 2388 2389 // -Xshare:dump 2390 } else if (match_option(option, "-Xshare:dump", &tail)) { 2391 #ifdef TIERED 2392 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2393 set_mode_flags(_int); // Prevent compilation, which creates objects 2394 #elif defined(COMPILER2) 2395 vm_exit_during_initialization( 2396 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2397 #elif defined(KERNEL) 2398 vm_exit_during_initialization( 2399 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2400 #else 2401 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2402 set_mode_flags(_int); // Prevent compilation, which creates objects 2403 #endif 2404 // -Xshare:on 2405 } else if (match_option(option, "-Xshare:on", &tail)) { 2406 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2407 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2408 #ifdef TIERED 2409 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true); 2410 #endif // TIERED 2411 // -Xshare:auto 2412 } else if (match_option(option, "-Xshare:auto", &tail)) { 2413 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2414 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2415 // -Xshare:off 2416 } else if (match_option(option, "-Xshare:off", &tail)) { 2417 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2418 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2419 2420 // -Xverify 2421 } else if (match_option(option, "-Xverify", &tail)) { 2422 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2423 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2424 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2425 } else if (strcmp(tail, ":remote") == 0) { 2426 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2427 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2428 } else if (strcmp(tail, ":none") == 0) { 2429 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2430 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2431 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2432 return JNI_EINVAL; 2433 } 2434 // -Xdebug 2435 } else if (match_option(option, "-Xdebug", &tail)) { 2436 // note this flag has been used, then ignore 2437 set_xdebug_mode(true); 2438 // -Xnoagent 2439 } else if (match_option(option, "-Xnoagent", &tail)) { 2440 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2441 } else if (match_option(option, "-Xboundthreads", &tail)) { 2442 // Bind user level threads to kernel threads (Solaris only) 2443 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2444 } else if (match_option(option, "-Xloggc:", &tail)) { 2445 // Redirect GC output to the file. -Xloggc:<filename> 2446 // ostream_init_log(), when called will use this filename 2447 // to initialize a fileStream. 2448 _gc_log_filename = strdup(tail); 2449 FLAG_SET_CMDLINE(bool, PrintGC, true); 2450 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2451 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2452 2453 // JNI hooks 2454 } else if (match_option(option, "-Xcheck", &tail)) { 2455 if (!strcmp(tail, ":jni")) { 2456 CheckJNICalls = true; 2457 } else if (is_bad_option(option, args->ignoreUnrecognized, 2458 "check")) { 2459 return JNI_EINVAL; 2460 } 2461 } else if (match_option(option, "vfprintf", &tail)) { 2462 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2463 } else if (match_option(option, "exit", &tail)) { 2464 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2465 } else if (match_option(option, "abort", &tail)) { 2466 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2467 // -XX:+AggressiveHeap 2468 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2469 2470 // This option inspects the machine and attempts to set various 2471 // parameters to be optimal for long-running, memory allocation 2472 // intensive jobs. It is intended for machines with large 2473 // amounts of cpu and memory. 2474 2475 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2476 // VM, but we may not be able to represent the total physical memory 2477 // available (like having 8gb of memory on a box but using a 32bit VM). 2478 // Thus, we need to make sure we're using a julong for intermediate 2479 // calculations. 2480 julong initHeapSize; 2481 julong total_memory = os::physical_memory(); 2482 2483 if (total_memory < (julong)256*M) { 2484 jio_fprintf(defaultStream::error_stream(), 2485 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2486 vm_exit(1); 2487 } 2488 2489 // The heap size is half of available memory, or (at most) 2490 // all of possible memory less 160mb (leaving room for the OS 2491 // when using ISM). This is the maximum; because adaptive sizing 2492 // is turned on below, the actual space used may be smaller. 2493 2494 initHeapSize = MIN2(total_memory / (julong)2, 2495 total_memory - (julong)160*M); 2496 2497 // Make sure that if we have a lot of memory we cap the 32 bit 2498 // process space. The 64bit VM version of this function is a nop. 2499 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2500 2501 // The perm gen is separate but contiguous with the 2502 // object heap (and is reserved with it) so subtract it 2503 // from the heap size. 2504 if (initHeapSize > MaxPermSize) { 2505 initHeapSize = initHeapSize - MaxPermSize; 2506 } else { 2507 warning("AggressiveHeap and MaxPermSize values may conflict"); 2508 } 2509 2510 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2511 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2512 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2513 // Currently the minimum size and the initial heap sizes are the same. 2514 set_min_heap_size(initHeapSize); 2515 } 2516 if (FLAG_IS_DEFAULT(NewSize)) { 2517 // Make the young generation 3/8ths of the total heap. 2518 FLAG_SET_CMDLINE(uintx, NewSize, 2519 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2520 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2521 } 2522 2523 FLAG_SET_DEFAULT(UseLargePages, true); 2524 2525 // Increase some data structure sizes for efficiency 2526 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2527 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2528 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2529 2530 // See the OldPLABSize comment below, but replace 'after promotion' 2531 // with 'after copying'. YoungPLABSize is the size of the survivor 2532 // space per-gc-thread buffers. The default is 4kw. 2533 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2534 2535 // OldPLABSize is the size of the buffers in the old gen that 2536 // UseParallelGC uses to promote live data that doesn't fit in the 2537 // survivor spaces. At any given time, there's one for each gc thread. 2538 // The default size is 1kw. These buffers are rarely used, since the 2539 // survivor spaces are usually big enough. For specjbb, however, there 2540 // are occasions when there's lots of live data in the young gen 2541 // and we end up promoting some of it. We don't have a definite 2542 // explanation for why bumping OldPLABSize helps, but the theory 2543 // is that a bigger PLAB results in retaining something like the 2544 // original allocation order after promotion, which improves mutator 2545 // locality. A minor effect may be that larger PLABs reduce the 2546 // number of PLAB allocation events during gc. The value of 8kw 2547 // was arrived at by experimenting with specjbb. 2548 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2549 2550 // CompilationPolicyChoice=0 causes the server compiler to adopt 2551 // a more conservative which-method-do-I-compile policy when one 2552 // of the counters maintained by the interpreter trips. The 2553 // result is reduced startup time and improved specjbb and 2554 // alacrity performance. Zero is the default, but we set it 2555 // explicitly here in case the default changes. 2556 // See runtime/compilationPolicy.*. 2557 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2558 2559 // Enable parallel GC and adaptive generation sizing 2560 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2561 FLAG_SET_DEFAULT(ParallelGCThreads, 2562 Abstract_VM_Version::parallel_worker_threads()); 2563 2564 // Encourage steady state memory management 2565 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2566 2567 // This appears to improve mutator locality 2568 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2569 2570 // Get around early Solaris scheduling bug 2571 // (affinity vs other jobs on system) 2572 // but disallow DR and offlining (5008695). 2573 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2574 2575 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2576 // The last option must always win. 2577 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2578 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2579 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2580 // The last option must always win. 2581 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2582 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2583 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2584 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2585 jio_fprintf(defaultStream::error_stream(), 2586 "Please use CMSClassUnloadingEnabled in place of " 2587 "CMSPermGenSweepingEnabled in the future\n"); 2588 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2589 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2590 jio_fprintf(defaultStream::error_stream(), 2591 "Please use -XX:+UseGCOverheadLimit in place of " 2592 "-XX:+UseGCTimeLimit in the future\n"); 2593 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2594 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2595 jio_fprintf(defaultStream::error_stream(), 2596 "Please use -XX:-UseGCOverheadLimit in place of " 2597 "-XX:-UseGCTimeLimit in the future\n"); 2598 // The TLE options are for compatibility with 1.3 and will be 2599 // removed without notice in a future release. These options 2600 // are not to be documented. 2601 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2602 // No longer used. 2603 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2604 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2605 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2606 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2607 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2608 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2609 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2610 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2611 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2612 // No longer used. 2613 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2614 julong long_tlab_size = 0; 2615 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2616 if (errcode != arg_in_range) { 2617 jio_fprintf(defaultStream::error_stream(), 2618 "Invalid TLAB size: %s\n", option->optionString); 2619 describe_range_error(errcode); 2620 return JNI_EINVAL; 2621 } 2622 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2623 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2624 // No longer used. 2625 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2626 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2627 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2628 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2629 SOLARIS_ONLY( 2630 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2631 warning("-XX:+UsePermISM is obsolete."); 2632 FLAG_SET_CMDLINE(bool, UseISM, true); 2633 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2634 FLAG_SET_CMDLINE(bool, UseISM, false); 2635 ) 2636 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2637 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2638 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2639 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2640 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2641 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2642 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2643 #ifdef SOLARIS 2644 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2645 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2646 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2647 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2648 #else // ndef SOLARIS 2649 jio_fprintf(defaultStream::error_stream(), 2650 "ExtendedDTraceProbes flag is only applicable on Solaris\n"); 2651 return JNI_EINVAL; 2652 #endif // ndef SOLARIS 2653 #ifdef ASSERT 2654 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2655 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2656 // disable scavenge before parallel mark-compact 2657 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2658 #endif 2659 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2660 julong cms_blocks_to_claim = (julong)atol(tail); 2661 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2662 jio_fprintf(defaultStream::error_stream(), 2663 "Please use -XX:OldPLABSize in place of " 2664 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2665 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2666 julong cms_blocks_to_claim = (julong)atol(tail); 2667 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2668 jio_fprintf(defaultStream::error_stream(), 2669 "Please use -XX:OldPLABSize in place of " 2670 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2671 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2672 julong old_plab_size = 0; 2673 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2674 if (errcode != arg_in_range) { 2675 jio_fprintf(defaultStream::error_stream(), 2676 "Invalid old PLAB size: %s\n", option->optionString); 2677 describe_range_error(errcode); 2678 return JNI_EINVAL; 2679 } 2680 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2681 jio_fprintf(defaultStream::error_stream(), 2682 "Please use -XX:OldPLABSize in place of " 2683 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2684 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2685 julong young_plab_size = 0; 2686 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2687 if (errcode != arg_in_range) { 2688 jio_fprintf(defaultStream::error_stream(), 2689 "Invalid young PLAB size: %s\n", option->optionString); 2690 describe_range_error(errcode); 2691 return JNI_EINVAL; 2692 } 2693 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2694 jio_fprintf(defaultStream::error_stream(), 2695 "Please use -XX:YoungPLABSize in place of " 2696 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2697 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2698 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2699 julong stack_size = 0; 2700 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2701 if (errcode != arg_in_range) { 2702 jio_fprintf(defaultStream::error_stream(), 2703 "Invalid mark stack size: %s\n", option->optionString); 2704 describe_range_error(errcode); 2705 return JNI_EINVAL; 2706 } 2707 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2708 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2709 julong max_stack_size = 0; 2710 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2711 if (errcode != arg_in_range) { 2712 jio_fprintf(defaultStream::error_stream(), 2713 "Invalid maximum mark stack size: %s\n", 2714 option->optionString); 2715 describe_range_error(errcode); 2716 return JNI_EINVAL; 2717 } 2718 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2719 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2720 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2721 uintx conc_threads = 0; 2722 if (!parse_uintx(tail, &conc_threads, 1)) { 2723 jio_fprintf(defaultStream::error_stream(), 2724 "Invalid concurrent threads: %s\n", option->optionString); 2725 return JNI_EINVAL; 2726 } 2727 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2728 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2729 // Skip -XX:Flags= since that case has already been handled 2730 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2731 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2732 return JNI_EINVAL; 2733 } 2734 } 2735 // Unknown option 2736 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2737 return JNI_ERR; 2738 } 2739 } 2740 // Change the default value for flags which have different default values 2741 // when working with older JDKs. 2742 if (JDK_Version::current().compare_major(6) <= 0 && 2743 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2744 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2745 } 2746 #ifdef LINUX 2747 if (JDK_Version::current().compare_major(6) <= 0 && 2748 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2749 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2750 } 2751 #endif // LINUX 2752 return JNI_OK; 2753 } 2754 2755 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2756 // This must be done after all -D arguments have been processed. 2757 scp_p->expand_endorsed(); 2758 2759 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2760 // Assemble the bootclasspath elements into the final path. 2761 Arguments::set_sysclasspath(scp_p->combined_path()); 2762 } 2763 2764 // This must be done after all arguments have been processed. 2765 // java_compiler() true means set to "NONE" or empty. 2766 if (java_compiler() && !xdebug_mode()) { 2767 // For backwards compatibility, we switch to interpreted mode if 2768 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2769 // not specified. 2770 set_mode_flags(_int); 2771 } 2772 if (CompileThreshold == 0) { 2773 set_mode_flags(_int); 2774 } 2775 2776 #ifndef COMPILER2 2777 // Don't degrade server performance for footprint 2778 if (FLAG_IS_DEFAULT(UseLargePages) && 2779 MaxHeapSize < LargePageHeapSizeThreshold) { 2780 // No need for large granularity pages w/small heaps. 2781 // Note that large pages are enabled/disabled for both the 2782 // Java heap and the code cache. 2783 FLAG_SET_DEFAULT(UseLargePages, false); 2784 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2785 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2786 } 2787 2788 // Tiered compilation is undefined with C1. 2789 TieredCompilation = false; 2790 #else 2791 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2792 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2793 } 2794 #endif 2795 2796 // If we are running in a headless jre, force java.awt.headless property 2797 // to be true unless the property has already been set. 2798 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2799 if (os::is_headless_jre()) { 2800 const char* headless = Arguments::get_property("java.awt.headless"); 2801 if (headless == NULL) { 2802 char envbuffer[128]; 2803 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2804 if (!add_property("java.awt.headless=true")) { 2805 return JNI_ENOMEM; 2806 } 2807 } else { 2808 char buffer[256]; 2809 strcpy(buffer, "java.awt.headless="); 2810 strcat(buffer, envbuffer); 2811 if (!add_property(buffer)) { 2812 return JNI_ENOMEM; 2813 } 2814 } 2815 } 2816 } 2817 2818 if (!check_vm_args_consistency()) { 2819 return JNI_ERR; 2820 } 2821 2822 return JNI_OK; 2823 } 2824 2825 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2826 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2827 scp_assembly_required_p); 2828 } 2829 2830 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2831 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2832 scp_assembly_required_p); 2833 } 2834 2835 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2836 const int N_MAX_OPTIONS = 64; 2837 const int OPTION_BUFFER_SIZE = 1024; 2838 char buffer[OPTION_BUFFER_SIZE]; 2839 2840 // The variable will be ignored if it exceeds the length of the buffer. 2841 // Don't check this variable if user has special privileges 2842 // (e.g. unix su command). 2843 if (os::getenv(name, buffer, sizeof(buffer)) && 2844 !os::have_special_privileges()) { 2845 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2846 jio_fprintf(defaultStream::error_stream(), 2847 "Picked up %s: %s\n", name, buffer); 2848 char* rd = buffer; // pointer to the input string (rd) 2849 int i; 2850 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2851 while (isspace(*rd)) rd++; // skip whitespace 2852 if (*rd == 0) break; // we re done when the input string is read completely 2853 2854 // The output, option string, overwrites the input string. 2855 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2856 // input string (rd). 2857 char* wrt = rd; 2858 2859 options[i++].optionString = wrt; // Fill in option 2860 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2861 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2862 int quote = *rd; // matching quote to look for 2863 rd++; // don't copy open quote 2864 while (*rd != quote) { // include everything (even spaces) up until quote 2865 if (*rd == 0) { // string termination means unmatched string 2866 jio_fprintf(defaultStream::error_stream(), 2867 "Unmatched quote in %s\n", name); 2868 return JNI_ERR; 2869 } 2870 *wrt++ = *rd++; // copy to option string 2871 } 2872 rd++; // don't copy close quote 2873 } else { 2874 *wrt++ = *rd++; // copy to option string 2875 } 2876 } 2877 // Need to check if we're done before writing a NULL, 2878 // because the write could be to the byte that rd is pointing to. 2879 if (*rd++ == 0) { 2880 *wrt = 0; 2881 break; 2882 } 2883 *wrt = 0; // Zero terminate option 2884 } 2885 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2886 JavaVMInitArgs vm_args; 2887 vm_args.version = JNI_VERSION_1_2; 2888 vm_args.options = options; 2889 vm_args.nOptions = i; 2890 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2891 2892 if (PrintVMOptions) { 2893 const char* tail; 2894 for (int i = 0; i < vm_args.nOptions; i++) { 2895 const JavaVMOption *option = vm_args.options + i; 2896 if (match_option(option, "-XX:", &tail)) { 2897 logOption(tail); 2898 } 2899 } 2900 } 2901 2902 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2903 } 2904 return JNI_OK; 2905 } 2906 2907 2908 // Parse entry point called from JNI_CreateJavaVM 2909 2910 jint Arguments::parse(const JavaVMInitArgs* args) { 2911 2912 // Sharing support 2913 // Construct the path to the archive 2914 char jvm_path[JVM_MAXPATHLEN]; 2915 os::jvm_path(jvm_path, sizeof(jvm_path)); 2916 #ifdef TIERED 2917 if (strstr(jvm_path, "client") != NULL) { 2918 force_client_mode = true; 2919 } 2920 #endif // TIERED 2921 char *end = strrchr(jvm_path, *os::file_separator()); 2922 if (end != NULL) *end = '\0'; 2923 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2924 strlen(os::file_separator()) + 20); 2925 if (shared_archive_path == NULL) return JNI_ENOMEM; 2926 strcpy(shared_archive_path, jvm_path); 2927 strcat(shared_archive_path, os::file_separator()); 2928 strcat(shared_archive_path, "classes"); 2929 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2930 strcat(shared_archive_path, ".jsa"); 2931 SharedArchivePath = shared_archive_path; 2932 2933 // Remaining part of option string 2934 const char* tail; 2935 2936 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2937 bool settings_file_specified = false; 2938 const char* flags_file; 2939 int index; 2940 for (index = 0; index < args->nOptions; index++) { 2941 const JavaVMOption *option = args->options + index; 2942 if (match_option(option, "-XX:Flags=", &tail)) { 2943 flags_file = tail; 2944 settings_file_specified = true; 2945 } 2946 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2947 PrintVMOptions = true; 2948 } 2949 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2950 PrintVMOptions = false; 2951 } 2952 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2953 IgnoreUnrecognizedVMOptions = true; 2954 } 2955 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2956 IgnoreUnrecognizedVMOptions = false; 2957 } 2958 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 2959 CommandLineFlags::printFlags(); 2960 vm_exit(0); 2961 } 2962 2963 #ifndef PRODUCT 2964 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 2965 CommandLineFlags::printFlags(true); 2966 vm_exit(0); 2967 } 2968 #endif 2969 } 2970 2971 if (IgnoreUnrecognizedVMOptions) { 2972 // uncast const to modify the flag args->ignoreUnrecognized 2973 *(jboolean*)(&args->ignoreUnrecognized) = true; 2974 } 2975 2976 // Parse specified settings file 2977 if (settings_file_specified) { 2978 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 2979 return JNI_EINVAL; 2980 } 2981 } 2982 2983 // Parse default .hotspotrc settings file 2984 if (!settings_file_specified) { 2985 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 2986 return JNI_EINVAL; 2987 } 2988 } 2989 2990 if (PrintVMOptions) { 2991 for (index = 0; index < args->nOptions; index++) { 2992 const JavaVMOption *option = args->options + index; 2993 if (match_option(option, "-XX:", &tail)) { 2994 logOption(tail); 2995 } 2996 } 2997 } 2998 2999 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3000 jint result = parse_vm_init_args(args); 3001 if (result != JNI_OK) { 3002 return result; 3003 } 3004 3005 #ifndef PRODUCT 3006 if (TraceBytecodesAt != 0) { 3007 TraceBytecodes = true; 3008 } 3009 if (CountCompiledCalls) { 3010 if (UseCounterDecay) { 3011 warning("UseCounterDecay disabled because CountCalls is set"); 3012 UseCounterDecay = false; 3013 } 3014 } 3015 #endif // PRODUCT 3016 3017 if (EnableInvokeDynamic && !EnableMethodHandles) { 3018 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) { 3019 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true"); 3020 } 3021 EnableMethodHandles = true; 3022 } 3023 if (EnableMethodHandles && !AnonymousClasses) { 3024 if (!FLAG_IS_DEFAULT(AnonymousClasses)) { 3025 warning("forcing AnonymousClasses true because EnableMethodHandles is true"); 3026 } 3027 AnonymousClasses = true; 3028 } 3029 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) { 3030 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3031 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true"); 3032 } 3033 ScavengeRootsInCode = 1; 3034 } 3035 3036 if (PrintGCDetails) { 3037 // Turn on -verbose:gc options as well 3038 PrintGC = true; 3039 } 3040 3041 // Set object alignment values. 3042 set_object_alignment(); 3043 3044 #ifdef SERIALGC 3045 force_serial_gc(); 3046 #endif // SERIALGC 3047 #ifdef KERNEL 3048 no_shared_spaces(); 3049 #endif // KERNEL 3050 3051 // Set flags based on ergonomics. 3052 set_ergonomics_flags(); 3053 3054 if (UseCompressedOops) { 3055 check_compressed_oops_compat(); 3056 } 3057 3058 // Check the GC selections again. 3059 if (!check_gc_consistency()) { 3060 return JNI_EINVAL; 3061 } 3062 3063 if (TieredCompilation) { 3064 set_tiered_flags(); 3065 } else { 3066 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3067 if (CompilationPolicyChoice >= 2) { 3068 vm_exit_during_initialization( 3069 "Incompatible compilation policy selected", NULL); 3070 } 3071 } 3072 3073 #ifndef KERNEL 3074 if (UseConcMarkSweepGC) { 3075 // Set flags for CMS and ParNew. Check UseConcMarkSweep first 3076 // to ensure that when both UseConcMarkSweepGC and UseParNewGC 3077 // are true, we don't call set_parnew_gc_flags() as well. 3078 set_cms_and_parnew_gc_flags(); 3079 } else { 3080 // Set heap size based on available physical memory 3081 set_heap_size(); 3082 // Set per-collector flags 3083 if (UseParallelGC || UseParallelOldGC) { 3084 set_parallel_gc_flags(); 3085 } else if (UseParNewGC) { 3086 set_parnew_gc_flags(); 3087 } else if (UseG1GC) { 3088 set_g1_gc_flags(); 3089 } 3090 } 3091 #endif // KERNEL 3092 3093 #ifdef SERIALGC 3094 assert(verify_serial_gc_flags(), "SerialGC unset"); 3095 #endif // SERIALGC 3096 3097 // Set bytecode rewriting flags 3098 set_bytecode_flags(); 3099 3100 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3101 set_aggressive_opts_flags(); 3102 3103 // Turn off biased locking for locking debug mode flags, 3104 // which are subtlely different from each other but neither works with 3105 // biased locking. 3106 if (!UseFastLocking || UseHeavyMonitors) { 3107 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3108 // flag set to true on command line; warn the user that they 3109 // can't enable biased locking here 3110 warning("Biased Locking is not supported with locking debug flags" 3111 "; ignoring UseBiasedLocking flag." ); 3112 } 3113 UseBiasedLocking = false; 3114 } 3115 3116 #ifdef CC_INTERP 3117 // Clear flags not supported by the C++ interpreter 3118 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3119 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3120 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3121 #endif // CC_INTERP 3122 3123 #ifdef COMPILER2 3124 if (!UseBiasedLocking || EmitSync != 0) { 3125 UseOptoBiasInlining = false; 3126 } 3127 #endif 3128 3129 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3130 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3131 DebugNonSafepoints = true; 3132 } 3133 3134 #ifndef PRODUCT 3135 if (CompileTheWorld) { 3136 // Force NmethodSweeper to sweep whole CodeCache each time. 3137 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3138 NmethodSweepFraction = 1; 3139 } 3140 } 3141 #endif 3142 3143 if (PrintCommandLineFlags) { 3144 CommandLineFlags::printSetFlags(); 3145 } 3146 3147 // Apply CPU specific policy for the BiasedLocking 3148 if (UseBiasedLocking) { 3149 if (!VM_Version::use_biased_locking() && 3150 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3151 UseBiasedLocking = false; 3152 } 3153 } 3154 3155 return JNI_OK; 3156 } 3157 3158 int Arguments::PropertyList_count(SystemProperty* pl) { 3159 int count = 0; 3160 while(pl != NULL) { 3161 count++; 3162 pl = pl->next(); 3163 } 3164 return count; 3165 } 3166 3167 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3168 assert(key != NULL, "just checking"); 3169 SystemProperty* prop; 3170 for (prop = pl; prop != NULL; prop = prop->next()) { 3171 if (strcmp(key, prop->key()) == 0) return prop->value(); 3172 } 3173 return NULL; 3174 } 3175 3176 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3177 int count = 0; 3178 const char* ret_val = NULL; 3179 3180 while(pl != NULL) { 3181 if(count >= index) { 3182 ret_val = pl->key(); 3183 break; 3184 } 3185 count++; 3186 pl = pl->next(); 3187 } 3188 3189 return ret_val; 3190 } 3191 3192 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3193 int count = 0; 3194 char* ret_val = NULL; 3195 3196 while(pl != NULL) { 3197 if(count >= index) { 3198 ret_val = pl->value(); 3199 break; 3200 } 3201 count++; 3202 pl = pl->next(); 3203 } 3204 3205 return ret_val; 3206 } 3207 3208 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3209 SystemProperty* p = *plist; 3210 if (p == NULL) { 3211 *plist = new_p; 3212 } else { 3213 while (p->next() != NULL) { 3214 p = p->next(); 3215 } 3216 p->set_next(new_p); 3217 } 3218 } 3219 3220 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3221 if (plist == NULL) 3222 return; 3223 3224 SystemProperty* new_p = new SystemProperty(k, v, true); 3225 PropertyList_add(plist, new_p); 3226 } 3227 3228 // This add maintains unique property key in the list. 3229 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3230 if (plist == NULL) 3231 return; 3232 3233 // If property key exist then update with new value. 3234 SystemProperty* prop; 3235 for (prop = *plist; prop != NULL; prop = prop->next()) { 3236 if (strcmp(k, prop->key()) == 0) { 3237 if (append) { 3238 prop->append_value(v); 3239 } else { 3240 prop->set_value(v); 3241 } 3242 return; 3243 } 3244 } 3245 3246 PropertyList_add(plist, k, v); 3247 } 3248 3249 #ifdef KERNEL 3250 char *Arguments::get_kernel_properties() { 3251 // Find properties starting with kernel and append them to string 3252 // We need to find out how long they are first because the URL's that they 3253 // might point to could get long. 3254 int length = 0; 3255 SystemProperty* prop; 3256 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3257 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3258 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3259 } 3260 } 3261 // Add one for null terminator. 3262 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 3263 if (length != 0) { 3264 int pos = 0; 3265 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3266 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3267 jio_snprintf(&props[pos], length-pos, 3268 "-D%s=%s ", prop->key(), prop->value()); 3269 pos = strlen(props); 3270 } 3271 } 3272 } 3273 // null terminate props in case of null 3274 props[length] = '\0'; 3275 return props; 3276 } 3277 #endif // KERNEL 3278 3279 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3280 // Returns true if all of the source pointed by src has been copied over to 3281 // the destination buffer pointed by buf. Otherwise, returns false. 3282 // Notes: 3283 // 1. If the length (buflen) of the destination buffer excluding the 3284 // NULL terminator character is not long enough for holding the expanded 3285 // pid characters, it also returns false instead of returning the partially 3286 // expanded one. 3287 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3288 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3289 char* buf, size_t buflen) { 3290 const char* p = src; 3291 char* b = buf; 3292 const char* src_end = &src[srclen]; 3293 char* buf_end = &buf[buflen - 1]; 3294 3295 while (p < src_end && b < buf_end) { 3296 if (*p == '%') { 3297 switch (*(++p)) { 3298 case '%': // "%%" ==> "%" 3299 *b++ = *p++; 3300 break; 3301 case 'p': { // "%p" ==> current process id 3302 // buf_end points to the character before the last character so 3303 // that we could write '\0' to the end of the buffer. 3304 size_t buf_sz = buf_end - b + 1; 3305 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3306 3307 // if jio_snprintf fails or the buffer is not long enough to hold 3308 // the expanded pid, returns false. 3309 if (ret < 0 || ret >= (int)buf_sz) { 3310 return false; 3311 } else { 3312 b += ret; 3313 assert(*b == '\0', "fail in copy_expand_pid"); 3314 if (p == src_end && b == buf_end + 1) { 3315 // reach the end of the buffer. 3316 return true; 3317 } 3318 } 3319 p++; 3320 break; 3321 } 3322 default : 3323 *b++ = '%'; 3324 } 3325 } else { 3326 *b++ = *p++; 3327 } 3328 } 3329 *b = '\0'; 3330 return (p == src_end); // return false if not all of the source was copied 3331 }