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 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1029 FLAG_SET_DEFAULT(CompilationPolicyChoice, 2); 1030 } 1031 if (CompilationPolicyChoice < 2) { 1032 vm_exit_during_initialization( 1033 "Incompatible compilation policy selected", NULL); 1034 } 1035 // Increase the code cache size - tiered compiles a lot more. 1036 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1037 FLAG_SET_DEFAULT(ReservedCodeCacheSize, ReservedCodeCacheSize * 2); 1038 } 1039 } 1040 1041 #ifndef KERNEL 1042 // If the user has chosen ParallelGCThreads > 0, we set UseParNewGC 1043 // if it's not explictly set or unset. If the user has chosen 1044 // UseParNewGC and not explicitly set ParallelGCThreads we 1045 // set it, unless this is a single cpu machine. 1046 void Arguments::set_parnew_gc_flags() { 1047 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1048 "control point invariant"); 1049 assert(UseParNewGC, "Error"); 1050 1051 // Turn off AdaptiveSizePolicy by default for parnew until it is 1052 // complete. 1053 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1054 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1055 } 1056 1057 if (ParallelGCThreads == 0) { 1058 FLAG_SET_DEFAULT(ParallelGCThreads, 1059 Abstract_VM_Version::parallel_worker_threads()); 1060 if (ParallelGCThreads == 1) { 1061 FLAG_SET_DEFAULT(UseParNewGC, false); 1062 FLAG_SET_DEFAULT(ParallelGCThreads, 0); 1063 } 1064 } 1065 if (UseParNewGC) { 1066 // CDS doesn't work with ParNew yet 1067 no_shared_spaces(); 1068 1069 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1070 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1071 // we set them to 1024 and 1024. 1072 // See CR 6362902. 1073 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1074 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1075 } 1076 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1077 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1078 } 1079 1080 // AlwaysTenure flag should make ParNew promote all at first collection. 1081 // See CR 6362902. 1082 if (AlwaysTenure) { 1083 FLAG_SET_CMDLINE(intx, MaxTenuringThreshold, 0); 1084 } 1085 // When using compressed oops, we use local overflow stacks, 1086 // rather than using a global overflow list chained through 1087 // the klass word of the object's pre-image. 1088 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1089 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1090 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1091 } 1092 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1093 } 1094 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1095 } 1096 } 1097 1098 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1099 // sparc/solaris for certain applications, but would gain from 1100 // further optimization and tuning efforts, and would almost 1101 // certainly gain from analysis of platform and environment. 1102 void Arguments::set_cms_and_parnew_gc_flags() { 1103 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1104 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1105 1106 // If we are using CMS, we prefer to UseParNewGC, 1107 // unless explicitly forbidden. 1108 if (FLAG_IS_DEFAULT(UseParNewGC)) { 1109 FLAG_SET_ERGO(bool, UseParNewGC, true); 1110 } 1111 1112 // Turn off AdaptiveSizePolicy by default for cms until it is 1113 // complete. 1114 if (FLAG_IS_DEFAULT(UseAdaptiveSizePolicy)) { 1115 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1116 } 1117 1118 // In either case, adjust ParallelGCThreads and/or UseParNewGC 1119 // as needed. 1120 if (UseParNewGC) { 1121 set_parnew_gc_flags(); 1122 } 1123 1124 // Now make adjustments for CMS 1125 size_t young_gen_per_worker; 1126 intx new_ratio; 1127 size_t min_new_default; 1128 intx tenuring_default; 1129 if (CMSUseOldDefaults) { // old defaults: "old" as of 6.0 1130 if FLAG_IS_DEFAULT(CMSYoungGenPerWorker) { 1131 FLAG_SET_ERGO(intx, CMSYoungGenPerWorker, 4*M); 1132 } 1133 young_gen_per_worker = 4*M; 1134 new_ratio = (intx)15; 1135 min_new_default = 4*M; 1136 tenuring_default = (intx)0; 1137 } else { // new defaults: "new" as of 6.0 1138 young_gen_per_worker = CMSYoungGenPerWorker; 1139 new_ratio = (intx)7; 1140 min_new_default = 16*M; 1141 tenuring_default = (intx)4; 1142 } 1143 1144 // Preferred young gen size for "short" pauses 1145 const uintx parallel_gc_threads = 1146 (ParallelGCThreads == 0 ? 1 : ParallelGCThreads); 1147 const size_t preferred_max_new_size_unaligned = 1148 ScaleForWordSize(young_gen_per_worker * parallel_gc_threads); 1149 const size_t preferred_max_new_size = 1150 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1151 1152 // Unless explicitly requested otherwise, size young gen 1153 // for "short" pauses ~ 4M*ParallelGCThreads 1154 1155 // If either MaxNewSize or NewRatio is set on the command line, 1156 // assume the user is trying to set the size of the young gen. 1157 1158 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1159 1160 // Set MaxNewSize to our calculated preferred_max_new_size unless 1161 // NewSize was set on the command line and it is larger than 1162 // preferred_max_new_size. 1163 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1164 FLAG_SET_ERGO(uintx, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1165 } else { 1166 FLAG_SET_ERGO(uintx, MaxNewSize, preferred_max_new_size); 1167 } 1168 if (PrintGCDetails && Verbose) { 1169 // Too early to use gclog_or_tty 1170 tty->print_cr("Ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1171 } 1172 1173 // Unless explicitly requested otherwise, prefer a large 1174 // Old to Young gen size so as to shift the collection load 1175 // to the old generation concurrent collector 1176 1177 // If this is only guarded by FLAG_IS_DEFAULT(NewRatio) 1178 // then NewSize and OldSize may be calculated. That would 1179 // generally lead to some differences with ParNewGC for which 1180 // there was no obvious reason. Also limit to the case where 1181 // MaxNewSize has not been set. 1182 1183 FLAG_SET_ERGO(intx, NewRatio, MAX2(NewRatio, new_ratio)); 1184 1185 // Code along this path potentially sets NewSize and OldSize 1186 1187 // Calculate the desired minimum size of the young gen but if 1188 // NewSize has been set on the command line, use it here since 1189 // it should be the final value. 1190 size_t min_new; 1191 if (FLAG_IS_DEFAULT(NewSize)) { 1192 min_new = align_size_up(ScaleForWordSize(min_new_default), 1193 os::vm_page_size()); 1194 } else { 1195 min_new = NewSize; 1196 } 1197 size_t prev_initial_size = InitialHeapSize; 1198 if (prev_initial_size != 0 && prev_initial_size < min_new + OldSize) { 1199 FLAG_SET_ERGO(uintx, InitialHeapSize, min_new + OldSize); 1200 // Currently minimum size and the initial heap sizes are the same. 1201 set_min_heap_size(InitialHeapSize); 1202 if (PrintGCDetails && Verbose) { 1203 warning("Initial heap size increased to " SIZE_FORMAT " M from " 1204 SIZE_FORMAT " M; use -XX:NewSize=... for finer control.", 1205 InitialHeapSize/M, prev_initial_size/M); 1206 } 1207 } 1208 1209 // MaxHeapSize is aligned down in collectorPolicy 1210 size_t max_heap = 1211 align_size_down(MaxHeapSize, 1212 CardTableRS::ct_max_alignment_constraint()); 1213 1214 if (PrintGCDetails && Verbose) { 1215 // Too early to use gclog_or_tty 1216 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1217 " initial_heap_size: " SIZE_FORMAT 1218 " max_heap: " SIZE_FORMAT, 1219 min_heap_size(), InitialHeapSize, max_heap); 1220 } 1221 if (max_heap > min_new) { 1222 // Unless explicitly requested otherwise, make young gen 1223 // at least min_new, and at most preferred_max_new_size. 1224 if (FLAG_IS_DEFAULT(NewSize)) { 1225 FLAG_SET_ERGO(uintx, NewSize, MAX2(NewSize, min_new)); 1226 FLAG_SET_ERGO(uintx, NewSize, MIN2(preferred_max_new_size, NewSize)); 1227 if (PrintGCDetails && Verbose) { 1228 // Too early to use gclog_or_tty 1229 tty->print_cr("Ergo set NewSize: " SIZE_FORMAT, NewSize); 1230 } 1231 } 1232 // Unless explicitly requested otherwise, size old gen 1233 // so that it's at least 3X of NewSize to begin with; 1234 // later NewRatio will decide how it grows; see above. 1235 if (FLAG_IS_DEFAULT(OldSize)) { 1236 if (max_heap > NewSize) { 1237 FLAG_SET_ERGO(uintx, OldSize, MIN2(3*NewSize, max_heap - NewSize)); 1238 if (PrintGCDetails && Verbose) { 1239 // Too early to use gclog_or_tty 1240 tty->print_cr("Ergo set OldSize: " SIZE_FORMAT, OldSize); 1241 } 1242 } 1243 } 1244 } 1245 } 1246 // Unless explicitly requested otherwise, definitely 1247 // promote all objects surviving "tenuring_default" scavenges. 1248 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1249 FLAG_IS_DEFAULT(SurvivorRatio)) { 1250 FLAG_SET_ERGO(intx, MaxTenuringThreshold, tenuring_default); 1251 } 1252 // If we decided above (or user explicitly requested) 1253 // `promote all' (via MaxTenuringThreshold := 0), 1254 // prefer minuscule survivor spaces so as not to waste 1255 // space for (non-existent) survivors 1256 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1257 FLAG_SET_ERGO(intx, SurvivorRatio, MAX2((intx)1024, SurvivorRatio)); 1258 } 1259 // If OldPLABSize is set and CMSParPromoteBlocksToClaim is not, 1260 // set CMSParPromoteBlocksToClaim equal to OldPLABSize. 1261 // This is done in order to make ParNew+CMS configuration to work 1262 // with YoungPLABSize and OldPLABSize options. 1263 // See CR 6362902. 1264 if (!FLAG_IS_DEFAULT(OldPLABSize)) { 1265 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1266 // OldPLABSize is not the default value but CMSParPromoteBlocksToClaim 1267 // is. In this situtation let CMSParPromoteBlocksToClaim follow 1268 // the value (either from the command line or ergonomics) of 1269 // OldPLABSize. Following OldPLABSize is an ergonomics decision. 1270 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, OldPLABSize); 1271 } else { 1272 // OldPLABSize and CMSParPromoteBlocksToClaim are both set. 1273 // CMSParPromoteBlocksToClaim is a collector-specific flag, so 1274 // we'll let it to take precedence. 1275 jio_fprintf(defaultStream::error_stream(), 1276 "Both OldPLABSize and CMSParPromoteBlocksToClaim" 1277 " options are specified for the CMS collector." 1278 " CMSParPromoteBlocksToClaim will take precedence.\n"); 1279 } 1280 } 1281 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1282 // OldPLAB sizing manually turned off: Use a larger default setting, 1283 // unless it was manually specified. This is because a too-low value 1284 // will slow down scavenges. 1285 if (FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim)) { 1286 FLAG_SET_ERGO(uintx, CMSParPromoteBlocksToClaim, 50); // default value before 6631166 1287 } 1288 } 1289 // Overwrite OldPLABSize which is the variable we will internally use everywhere. 1290 FLAG_SET_ERGO(uintx, OldPLABSize, CMSParPromoteBlocksToClaim); 1291 // If either of the static initialization defaults have changed, note this 1292 // modification. 1293 if (!FLAG_IS_DEFAULT(CMSParPromoteBlocksToClaim) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1294 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1295 } 1296 if (PrintGCDetails && Verbose) { 1297 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1298 MarkStackSize / K, MarkStackSizeMax / K); 1299 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1300 } 1301 } 1302 #endif // KERNEL 1303 1304 void set_object_alignment() { 1305 // Object alignment. 1306 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1307 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1308 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1309 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1310 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1311 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1312 1313 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1314 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1315 1316 // Oop encoding heap max 1317 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1318 1319 #ifndef KERNEL 1320 // Set CMS global values 1321 CompactibleFreeListSpace::set_cms_values(); 1322 #endif // KERNEL 1323 } 1324 1325 bool verify_object_alignment() { 1326 // Object alignment. 1327 if (!is_power_of_2(ObjectAlignmentInBytes)) { 1328 jio_fprintf(defaultStream::error_stream(), 1329 "error: ObjectAlignmentInBytes=%d must be power of 2\n", 1330 (int)ObjectAlignmentInBytes); 1331 return false; 1332 } 1333 if ((int)ObjectAlignmentInBytes < BytesPerLong) { 1334 jio_fprintf(defaultStream::error_stream(), 1335 "error: ObjectAlignmentInBytes=%d must be greater or equal %d\n", 1336 (int)ObjectAlignmentInBytes, BytesPerLong); 1337 return false; 1338 } 1339 // It does not make sense to have big object alignment 1340 // since a space lost due to alignment will be greater 1341 // then a saved space from compressed oops. 1342 if ((int)ObjectAlignmentInBytes > 256) { 1343 jio_fprintf(defaultStream::error_stream(), 1344 "error: ObjectAlignmentInBytes=%d must not be greater then 256\n", 1345 (int)ObjectAlignmentInBytes); 1346 return false; 1347 } 1348 // In case page size is very small. 1349 if ((int)ObjectAlignmentInBytes >= os::vm_page_size()) { 1350 jio_fprintf(defaultStream::error_stream(), 1351 "error: ObjectAlignmentInBytes=%d must be less then page size %d\n", 1352 (int)ObjectAlignmentInBytes, os::vm_page_size()); 1353 return false; 1354 } 1355 return true; 1356 } 1357 1358 inline uintx max_heap_for_compressed_oops() { 1359 // Avoid sign flip. 1360 if (OopEncodingHeapMax < MaxPermSize + os::vm_page_size()) { 1361 return 0; 1362 } 1363 LP64_ONLY(return OopEncodingHeapMax - MaxPermSize - os::vm_page_size()); 1364 NOT_LP64(ShouldNotReachHere(); return 0); 1365 } 1366 1367 bool Arguments::should_auto_select_low_pause_collector() { 1368 if (UseAutoGCSelectPolicy && 1369 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1370 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1371 if (PrintGCDetails) { 1372 // Cannot use gclog_or_tty yet. 1373 tty->print_cr("Automatic selection of the low pause collector" 1374 " based on pause goal of %d (ms)", MaxGCPauseMillis); 1375 } 1376 return true; 1377 } 1378 return false; 1379 } 1380 1381 void Arguments::set_ergonomics_flags() { 1382 // Parallel GC is not compatible with sharing. If one specifies 1383 // that they want sharing explicitly, do not set ergonomics flags. 1384 if (DumpSharedSpaces || ForceSharedSpaces) { 1385 return; 1386 } 1387 1388 if (os::is_server_class_machine() && !force_client_mode ) { 1389 // If no other collector is requested explicitly, 1390 // let the VM select the collector based on 1391 // machine class and automatic selection policy. 1392 if (!UseSerialGC && 1393 !UseConcMarkSweepGC && 1394 !UseG1GC && 1395 !UseParNewGC && 1396 !DumpSharedSpaces && 1397 FLAG_IS_DEFAULT(UseParallelGC)) { 1398 if (should_auto_select_low_pause_collector()) { 1399 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1400 } else { 1401 FLAG_SET_ERGO(bool, UseParallelGC, true); 1402 } 1403 no_shared_spaces(); 1404 } 1405 } 1406 1407 #ifndef ZERO 1408 #ifdef _LP64 1409 // Check that UseCompressedOops can be set with the max heap size allocated 1410 // by ergonomics. 1411 if (MaxHeapSize <= max_heap_for_compressed_oops()) { 1412 #if !defined(COMPILER1) || defined(TIERED) 1413 if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) { 1414 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1415 } 1416 #endif 1417 #ifdef _WIN64 1418 if (UseLargePages && UseCompressedOops) { 1419 // Cannot allocate guard pages for implicit checks in indexed addressing 1420 // mode, when large pages are specified on windows. 1421 // This flag could be switched ON if narrow oop base address is set to 0, 1422 // see code in Universe::initialize_heap(). 1423 Universe::set_narrow_oop_use_implicit_null_checks(false); 1424 } 1425 #endif // _WIN64 1426 } else { 1427 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1428 warning("Max heap size too large for Compressed Oops"); 1429 FLAG_SET_DEFAULT(UseCompressedOops, false); 1430 } 1431 } 1432 // Also checks that certain machines are slower with compressed oops 1433 // in vm_version initialization code. 1434 #endif // _LP64 1435 #endif // !ZERO 1436 } 1437 1438 void Arguments::set_parallel_gc_flags() { 1439 assert(UseParallelGC || UseParallelOldGC, "Error"); 1440 // If parallel old was requested, automatically enable parallel scavenge. 1441 if (UseParallelOldGC && !UseParallelGC && FLAG_IS_DEFAULT(UseParallelGC)) { 1442 FLAG_SET_DEFAULT(UseParallelGC, true); 1443 } 1444 1445 // If no heap maximum was requested explicitly, use some reasonable fraction 1446 // of the physical memory, up to a maximum of 1GB. 1447 if (UseParallelGC) { 1448 FLAG_SET_ERGO(uintx, ParallelGCThreads, 1449 Abstract_VM_Version::parallel_worker_threads()); 1450 1451 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1452 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1453 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1454 // See CR 6362902 for details. 1455 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1456 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1457 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1458 } 1459 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1460 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1461 } 1462 } 1463 1464 if (UseParallelOldGC) { 1465 // Par compact uses lower default values since they are treated as 1466 // minimums. These are different defaults because of the different 1467 // interpretation and are not ergonomically set. 1468 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1469 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1470 } 1471 if (FLAG_IS_DEFAULT(PermMarkSweepDeadRatio)) { 1472 FLAG_SET_DEFAULT(PermMarkSweepDeadRatio, 5); 1473 } 1474 } 1475 } 1476 } 1477 1478 void Arguments::set_g1_gc_flags() { 1479 assert(UseG1GC, "Error"); 1480 #ifdef COMPILER1 1481 FastTLABRefill = false; 1482 #endif 1483 FLAG_SET_DEFAULT(ParallelGCThreads, 1484 Abstract_VM_Version::parallel_worker_threads()); 1485 if (ParallelGCThreads == 0) { 1486 FLAG_SET_DEFAULT(ParallelGCThreads, 1487 Abstract_VM_Version::parallel_worker_threads()); 1488 } 1489 no_shared_spaces(); 1490 1491 if (FLAG_IS_DEFAULT(MarkStackSize)) { 1492 FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE); 1493 } 1494 if (PrintGCDetails && Verbose) { 1495 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1496 MarkStackSize / K, MarkStackSizeMax / K); 1497 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1498 } 1499 1500 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1501 // In G1, we want the default GC overhead goal to be higher than 1502 // say in PS. So we set it here to 10%. Otherwise the heap might 1503 // be expanded more aggressively than we would like it to. In 1504 // fact, even 10% seems to not be high enough in some cases 1505 // (especially small GC stress tests that the main thing they do 1506 // is allocation). We might consider increase it further. 1507 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1508 } 1509 } 1510 1511 void Arguments::set_heap_size() { 1512 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1513 // Deprecated flag 1514 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1515 } 1516 1517 const julong phys_mem = 1518 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1519 : (julong)MaxRAM; 1520 1521 // If the maximum heap size has not been set with -Xmx, 1522 // then set it as fraction of the size of physical memory, 1523 // respecting the maximum and minimum sizes of the heap. 1524 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1525 julong reasonable_max = phys_mem / MaxRAMFraction; 1526 1527 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1528 // Small physical memory, so use a minimum fraction of it for the heap 1529 reasonable_max = phys_mem / MinRAMFraction; 1530 } else { 1531 // Not-small physical memory, so require a heap at least 1532 // as large as MaxHeapSize 1533 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1534 } 1535 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1536 // Limit the heap size to ErgoHeapSizeLimit 1537 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1538 } 1539 if (UseCompressedOops) { 1540 // Limit the heap size to the maximum possible when using compressed oops 1541 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1542 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1543 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1544 // but it should be not less than default MaxHeapSize. 1545 max_coop_heap -= HeapBaseMinAddress; 1546 } 1547 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1548 } 1549 reasonable_max = os::allocatable_physical_memory(reasonable_max); 1550 1551 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1552 // An initial heap size was specified on the command line, 1553 // so be sure that the maximum size is consistent. Done 1554 // after call to allocatable_physical_memory because that 1555 // method might reduce the allocation size. 1556 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1557 } 1558 1559 if (PrintGCDetails && Verbose) { 1560 // Cannot use gclog_or_tty yet. 1561 tty->print_cr(" Maximum heap size " SIZE_FORMAT, reasonable_max); 1562 } 1563 FLAG_SET_ERGO(uintx, MaxHeapSize, (uintx)reasonable_max); 1564 } 1565 1566 // If the initial_heap_size has not been set with InitialHeapSize 1567 // or -Xms, then set it as fraction of the size of physical memory, 1568 // respecting the maximum and minimum sizes of the heap. 1569 if (FLAG_IS_DEFAULT(InitialHeapSize)) { 1570 julong reasonable_minimum = (julong)(OldSize + NewSize); 1571 1572 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1573 1574 reasonable_minimum = os::allocatable_physical_memory(reasonable_minimum); 1575 1576 julong reasonable_initial = phys_mem / InitialRAMFraction; 1577 1578 reasonable_initial = MAX2(reasonable_initial, reasonable_minimum); 1579 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1580 1581 reasonable_initial = os::allocatable_physical_memory(reasonable_initial); 1582 1583 if (PrintGCDetails && Verbose) { 1584 // Cannot use gclog_or_tty yet. 1585 tty->print_cr(" Initial heap size " SIZE_FORMAT, (uintx)reasonable_initial); 1586 tty->print_cr(" Minimum heap size " SIZE_FORMAT, (uintx)reasonable_minimum); 1587 } 1588 FLAG_SET_ERGO(uintx, InitialHeapSize, (uintx)reasonable_initial); 1589 set_min_heap_size((uintx)reasonable_minimum); 1590 } 1591 } 1592 1593 // This must be called after ergonomics because we want bytecode rewriting 1594 // if the server compiler is used, or if UseSharedSpaces is disabled. 1595 void Arguments::set_bytecode_flags() { 1596 // Better not attempt to store into a read-only space. 1597 if (UseSharedSpaces) { 1598 FLAG_SET_DEFAULT(RewriteBytecodes, false); 1599 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1600 } 1601 1602 if (!RewriteBytecodes) { 1603 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1604 } 1605 } 1606 1607 // Aggressive optimization flags -XX:+AggressiveOpts 1608 void Arguments::set_aggressive_opts_flags() { 1609 #ifdef COMPILER2 1610 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1611 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1612 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1613 } 1614 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1615 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1616 } 1617 1618 // Feed the cache size setting into the JDK 1619 char buffer[1024]; 1620 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1621 add_property(buffer); 1622 } 1623 if (AggressiveOpts && FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1624 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1625 } 1626 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1627 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1628 } 1629 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeStringConcat)) { 1630 FLAG_SET_DEFAULT(OptimizeStringConcat, true); 1631 } 1632 if (AggressiveOpts && FLAG_IS_DEFAULT(OptimizeFill)) { 1633 FLAG_SET_DEFAULT(OptimizeFill, true); 1634 } 1635 #endif 1636 1637 if (AggressiveOpts) { 1638 // Sample flag setting code 1639 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1640 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1641 // } 1642 } 1643 } 1644 1645 //=========================================================================================================== 1646 // Parsing of java.compiler property 1647 1648 void Arguments::process_java_compiler_argument(char* arg) { 1649 // For backwards compatibility, Djava.compiler=NONE or "" 1650 // causes us to switch to -Xint mode UNLESS -Xdebug 1651 // is also specified. 1652 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1653 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1654 } 1655 } 1656 1657 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1658 _sun_java_launcher = strdup(launcher); 1659 } 1660 1661 bool Arguments::created_by_java_launcher() { 1662 assert(_sun_java_launcher != NULL, "property must have value"); 1663 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1664 } 1665 1666 //=========================================================================================================== 1667 // Parsing of main arguments 1668 1669 bool Arguments::verify_interval(uintx val, uintx min, 1670 uintx max, const char* name) { 1671 // Returns true iff value is in the inclusive interval [min..max] 1672 // false, otherwise. 1673 if (val >= min && val <= max) { 1674 return true; 1675 } 1676 jio_fprintf(defaultStream::error_stream(), 1677 "%s of " UINTX_FORMAT " is invalid; must be between " UINTX_FORMAT 1678 " and " UINTX_FORMAT "\n", 1679 name, val, min, max); 1680 return false; 1681 } 1682 1683 bool Arguments::verify_min_value(intx val, intx min, const char* name) { 1684 // Returns true if given value is greater than specified min threshold 1685 // false, otherwise. 1686 if (val >= min ) { 1687 return true; 1688 } 1689 jio_fprintf(defaultStream::error_stream(), 1690 "%s of " INTX_FORMAT " is invalid; must be greater than " INTX_FORMAT "\n", 1691 name, val, min); 1692 return false; 1693 } 1694 1695 bool Arguments::verify_percentage(uintx value, const char* name) { 1696 if (value <= 100) { 1697 return true; 1698 } 1699 jio_fprintf(defaultStream::error_stream(), 1700 "%s of " UINTX_FORMAT " is invalid; must be between 0 and 100\n", 1701 name, value); 1702 return false; 1703 } 1704 1705 static void force_serial_gc() { 1706 FLAG_SET_DEFAULT(UseSerialGC, true); 1707 FLAG_SET_DEFAULT(UseParNewGC, false); 1708 FLAG_SET_DEFAULT(UseConcMarkSweepGC, false); 1709 FLAG_SET_DEFAULT(CMSIncrementalMode, false); // special CMS suboption 1710 FLAG_SET_DEFAULT(UseParallelGC, false); 1711 FLAG_SET_DEFAULT(UseParallelOldGC, false); 1712 FLAG_SET_DEFAULT(UseG1GC, false); 1713 } 1714 1715 static bool verify_serial_gc_flags() { 1716 return (UseSerialGC && 1717 !(UseParNewGC || (UseConcMarkSweepGC || CMSIncrementalMode) || UseG1GC || 1718 UseParallelGC || UseParallelOldGC)); 1719 } 1720 1721 // Check consistency of GC selection 1722 bool Arguments::check_gc_consistency() { 1723 bool status = true; 1724 // Ensure that the user has not selected conflicting sets 1725 // of collectors. [Note: this check is merely a user convenience; 1726 // collectors over-ride each other so that only a non-conflicting 1727 // set is selected; however what the user gets is not what they 1728 // may have expected from the combination they asked for. It's 1729 // better to reduce user confusion by not allowing them to 1730 // select conflicting combinations. 1731 uint i = 0; 1732 if (UseSerialGC) i++; 1733 if (UseConcMarkSweepGC || UseParNewGC) i++; 1734 if (UseParallelGC || UseParallelOldGC) i++; 1735 if (UseG1GC) i++; 1736 if (i > 1) { 1737 jio_fprintf(defaultStream::error_stream(), 1738 "Conflicting collector combinations in option list; " 1739 "please refer to the release notes for the combinations " 1740 "allowed\n"); 1741 status = false; 1742 } 1743 1744 return status; 1745 } 1746 1747 // Check stack pages settings 1748 bool Arguments::check_stack_pages() 1749 { 1750 bool status = true; 1751 status = status && verify_min_value(StackYellowPages, 1, "StackYellowPages"); 1752 status = status && verify_min_value(StackRedPages, 1, "StackRedPages"); 1753 // greater stack shadow pages can't generate instruction to bang stack 1754 status = status && verify_interval(StackShadowPages, 1, 50, "StackShadowPages"); 1755 return status; 1756 } 1757 1758 // Check the consistency of vm_init_args 1759 bool Arguments::check_vm_args_consistency() { 1760 // Method for adding checks for flag consistency. 1761 // The intent is to warn the user of all possible conflicts, 1762 // before returning an error. 1763 // Note: Needs platform-dependent factoring. 1764 bool status = true; 1765 1766 #if ( (defined(COMPILER2) && defined(SPARC))) 1767 // NOTE: The call to VM_Version_init depends on the fact that VM_Version_init 1768 // on sparc doesn't require generation of a stub as is the case on, e.g., 1769 // x86. Normally, VM_Version_init must be called from init_globals in 1770 // init.cpp, which is called by the initial java thread *after* arguments 1771 // have been parsed. VM_Version_init gets called twice on sparc. 1772 extern void VM_Version_init(); 1773 VM_Version_init(); 1774 if (!VM_Version::has_v9()) { 1775 jio_fprintf(defaultStream::error_stream(), 1776 "V8 Machine detected, Server requires V9\n"); 1777 status = false; 1778 } 1779 #endif /* COMPILER2 && SPARC */ 1780 1781 // Allow both -XX:-UseStackBanging and -XX:-UseBoundThreads in non-product 1782 // builds so the cost of stack banging can be measured. 1783 #if (defined(PRODUCT) && defined(SOLARIS)) 1784 if (!UseBoundThreads && !UseStackBanging) { 1785 jio_fprintf(defaultStream::error_stream(), 1786 "-UseStackBanging conflicts with -UseBoundThreads\n"); 1787 1788 status = false; 1789 } 1790 #endif 1791 1792 if (TLABRefillWasteFraction == 0) { 1793 jio_fprintf(defaultStream::error_stream(), 1794 "TLABRefillWasteFraction should be a denominator, " 1795 "not " SIZE_FORMAT "\n", 1796 TLABRefillWasteFraction); 1797 status = false; 1798 } 1799 1800 status = status && verify_percentage(AdaptiveSizePolicyWeight, 1801 "AdaptiveSizePolicyWeight"); 1802 status = status && verify_percentage(AdaptivePermSizeWeight, "AdaptivePermSizeWeight"); 1803 status = status && verify_percentage(ThresholdTolerance, "ThresholdTolerance"); 1804 status = status && verify_percentage(MinHeapFreeRatio, "MinHeapFreeRatio"); 1805 status = status && verify_percentage(MaxHeapFreeRatio, "MaxHeapFreeRatio"); 1806 1807 if (MinHeapFreeRatio > MaxHeapFreeRatio) { 1808 jio_fprintf(defaultStream::error_stream(), 1809 "MinHeapFreeRatio (" UINTX_FORMAT ") must be less than or " 1810 "equal to MaxHeapFreeRatio (" UINTX_FORMAT ")\n", 1811 MinHeapFreeRatio, MaxHeapFreeRatio); 1812 status = false; 1813 } 1814 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1815 MinHeapFreeRatio = MIN2(MinHeapFreeRatio, (uintx) 99); 1816 1817 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 1818 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 1819 } 1820 1821 if (UseParallelOldGC && ParallelOldGCSplitALot) { 1822 // Settings to encourage splitting. 1823 if (!FLAG_IS_CMDLINE(NewRatio)) { 1824 FLAG_SET_CMDLINE(intx, NewRatio, 2); 1825 } 1826 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 1827 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 1828 } 1829 } 1830 1831 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1832 status = status && verify_percentage(GCTimeLimit, "GCTimeLimit"); 1833 if (GCTimeLimit == 100) { 1834 // Turn off gc-overhead-limit-exceeded checks 1835 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 1836 } 1837 1838 status = status && verify_percentage(GCHeapFreeLimit, "GCHeapFreeLimit"); 1839 1840 // Check whether user-specified sharing option conflicts with GC or page size. 1841 // Both sharing and large pages are enabled by default on some platforms; 1842 // large pages override sharing only if explicitly set on the command line. 1843 const bool cannot_share = UseConcMarkSweepGC || CMSIncrementalMode || 1844 UseG1GC || UseParNewGC || UseParallelGC || UseParallelOldGC || 1845 UseLargePages && FLAG_IS_CMDLINE(UseLargePages); 1846 if (cannot_share) { 1847 // Either force sharing on by forcing the other options off, or 1848 // force sharing off. 1849 if (DumpSharedSpaces || ForceSharedSpaces) { 1850 jio_fprintf(defaultStream::error_stream(), 1851 "Using Serial GC and default page size because of %s\n", 1852 ForceSharedSpaces ? "-Xshare:on" : "-Xshare:dump"); 1853 force_serial_gc(); 1854 FLAG_SET_DEFAULT(UseLargePages, false); 1855 } else { 1856 if (UseSharedSpaces && Verbose) { 1857 jio_fprintf(defaultStream::error_stream(), 1858 "Turning off use of shared archive because of " 1859 "choice of garbage collector or large pages\n"); 1860 } 1861 no_shared_spaces(); 1862 } 1863 } else if (UseLargePages && (UseSharedSpaces || DumpSharedSpaces)) { 1864 FLAG_SET_DEFAULT(UseLargePages, false); 1865 } 1866 1867 status = status && check_gc_consistency(); 1868 status = status && check_stack_pages(); 1869 1870 if (_has_alloc_profile) { 1871 if (UseParallelGC || UseParallelOldGC) { 1872 jio_fprintf(defaultStream::error_stream(), 1873 "error: invalid argument combination.\n" 1874 "Allocation profiling (-Xaprof) cannot be used together with " 1875 "Parallel GC (-XX:+UseParallelGC or -XX:+UseParallelOldGC).\n"); 1876 status = false; 1877 } 1878 if (UseConcMarkSweepGC) { 1879 jio_fprintf(defaultStream::error_stream(), 1880 "error: invalid argument combination.\n" 1881 "Allocation profiling (-Xaprof) cannot be used together with " 1882 "the CMS collector (-XX:+UseConcMarkSweepGC).\n"); 1883 status = false; 1884 } 1885 } 1886 1887 if (CMSIncrementalMode) { 1888 if (!UseConcMarkSweepGC) { 1889 jio_fprintf(defaultStream::error_stream(), 1890 "error: invalid argument combination.\n" 1891 "The CMS collector (-XX:+UseConcMarkSweepGC) must be " 1892 "selected in order\nto use CMSIncrementalMode.\n"); 1893 status = false; 1894 } else { 1895 status = status && verify_percentage(CMSIncrementalDutyCycle, 1896 "CMSIncrementalDutyCycle"); 1897 status = status && verify_percentage(CMSIncrementalDutyCycleMin, 1898 "CMSIncrementalDutyCycleMin"); 1899 status = status && verify_percentage(CMSIncrementalSafetyFactor, 1900 "CMSIncrementalSafetyFactor"); 1901 status = status && verify_percentage(CMSIncrementalOffset, 1902 "CMSIncrementalOffset"); 1903 status = status && verify_percentage(CMSExpAvgFactor, 1904 "CMSExpAvgFactor"); 1905 // If it was not set on the command line, set 1906 // CMSInitiatingOccupancyFraction to 1 so icms can initiate cycles early. 1907 if (CMSInitiatingOccupancyFraction < 0) { 1908 FLAG_SET_DEFAULT(CMSInitiatingOccupancyFraction, 1); 1909 } 1910 } 1911 } 1912 1913 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 1914 // insists that we hold the requisite locks so that the iteration is 1915 // MT-safe. For the verification at start-up and shut-down, we don't 1916 // yet have a good way of acquiring and releasing these locks, 1917 // which are not visible at the CollectedHeap level. We want to 1918 // be able to acquire these locks and then do the iteration rather 1919 // than just disable the lock verification. This will be fixed under 1920 // bug 4788986. 1921 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 1922 if (VerifyGCStartAt == 0) { 1923 warning("Heap verification at start-up disabled " 1924 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1925 VerifyGCStartAt = 1; // Disable verification at start-up 1926 } 1927 if (VerifyBeforeExit) { 1928 warning("Heap verification at shutdown disabled " 1929 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 1930 VerifyBeforeExit = false; // Disable verification at shutdown 1931 } 1932 } 1933 1934 // Note: only executed in non-PRODUCT mode 1935 if (!UseAsyncConcMarkSweepGC && 1936 (ExplicitGCInvokesConcurrent || 1937 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 1938 jio_fprintf(defaultStream::error_stream(), 1939 "error: +ExplictGCInvokesConcurrent[AndUnloadsClasses] conflicts" 1940 " with -UseAsyncConcMarkSweepGC"); 1941 status = false; 1942 } 1943 1944 #ifndef SERIALGC 1945 if (UseG1GC) { 1946 status = status && verify_percentage(InitiatingHeapOccupancyPercent, 1947 "InitiatingHeapOccupancyPercent"); 1948 status = status && verify_min_value(G1RefProcDrainInterval, 1, 1949 "G1RefProcDrainInterval"); 1950 status = status && verify_min_value((intx)G1ConcMarkStepDurationMillis, 1, 1951 "G1ConcMarkStepDurationMillis"); 1952 } 1953 #endif 1954 1955 status = status && verify_interval(RefDiscoveryPolicy, 1956 ReferenceProcessor::DiscoveryPolicyMin, 1957 ReferenceProcessor::DiscoveryPolicyMax, 1958 "RefDiscoveryPolicy"); 1959 1960 // Limit the lower bound of this flag to 1 as it is used in a division 1961 // expression. 1962 status = status && verify_interval(TLABWasteTargetPercent, 1963 1, 100, "TLABWasteTargetPercent"); 1964 1965 status = status && verify_object_alignment(); 1966 1967 return status; 1968 } 1969 1970 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1971 const char* option_type) { 1972 if (ignore) return false; 1973 1974 const char* spacer = " "; 1975 if (option_type == NULL) { 1976 option_type = ++spacer; // Set both to the empty string. 1977 } 1978 1979 if (os::obsolete_option(option)) { 1980 jio_fprintf(defaultStream::error_stream(), 1981 "Obsolete %s%soption: %s\n", option_type, spacer, 1982 option->optionString); 1983 return false; 1984 } else { 1985 jio_fprintf(defaultStream::error_stream(), 1986 "Unrecognized %s%soption: %s\n", option_type, spacer, 1987 option->optionString); 1988 return true; 1989 } 1990 } 1991 1992 static const char* user_assertion_options[] = { 1993 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1994 }; 1995 1996 static const char* system_assertion_options[] = { 1997 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1998 }; 1999 2000 // Return true if any of the strings in null-terminated array 'names' matches. 2001 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 2002 // the option must match exactly. 2003 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 2004 bool tail_allowed) { 2005 for (/* empty */; *names != NULL; ++names) { 2006 if (match_option(option, *names, tail)) { 2007 if (**tail == '\0' || tail_allowed && **tail == ':') { 2008 return true; 2009 } 2010 } 2011 } 2012 return false; 2013 } 2014 2015 bool Arguments::parse_uintx(const char* value, 2016 uintx* uintx_arg, 2017 uintx min_size) { 2018 2019 // Check the sign first since atomull() parses only unsigned values. 2020 bool value_is_positive = !(*value == '-'); 2021 2022 if (value_is_positive) { 2023 julong n; 2024 bool good_return = atomull(value, &n); 2025 if (good_return) { 2026 bool above_minimum = n >= min_size; 2027 bool value_is_too_large = n > max_uintx; 2028 2029 if (above_minimum && !value_is_too_large) { 2030 *uintx_arg = n; 2031 return true; 2032 } 2033 } 2034 } 2035 return false; 2036 } 2037 2038 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2039 julong* long_arg, 2040 julong min_size) { 2041 if (!atomull(s, long_arg)) return arg_unreadable; 2042 return check_memory_size(*long_arg, min_size); 2043 } 2044 2045 // Parse JavaVMInitArgs structure 2046 2047 jint Arguments::parse_vm_init_args(const JavaVMInitArgs* args) { 2048 // For components of the system classpath. 2049 SysClassPath scp(Arguments::get_sysclasspath()); 2050 bool scp_assembly_required = false; 2051 2052 // Save default settings for some mode flags 2053 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2054 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2055 Arguments::_ClipInlining = ClipInlining; 2056 Arguments::_BackgroundCompilation = BackgroundCompilation; 2057 2058 // Parse JAVA_TOOL_OPTIONS environment variable (if present) 2059 jint result = parse_java_tool_options_environment_variable(&scp, &scp_assembly_required); 2060 if (result != JNI_OK) { 2061 return result; 2062 } 2063 2064 // Parse JavaVMInitArgs structure passed in 2065 result = parse_each_vm_init_arg(args, &scp, &scp_assembly_required, COMMAND_LINE); 2066 if (result != JNI_OK) { 2067 return result; 2068 } 2069 2070 if (AggressiveOpts) { 2071 // Insert alt-rt.jar between user-specified bootclasspath 2072 // prefix and the default bootclasspath. os::set_boot_path() 2073 // uses meta_index_dir as the default bootclasspath directory. 2074 const char* altclasses_jar = "alt-rt.jar"; 2075 size_t altclasses_path_len = strlen(get_meta_index_dir()) + 1 + 2076 strlen(altclasses_jar); 2077 char* altclasses_path = NEW_C_HEAP_ARRAY(char, altclasses_path_len); 2078 strcpy(altclasses_path, get_meta_index_dir()); 2079 strcat(altclasses_path, altclasses_jar); 2080 scp.add_suffix_to_prefix(altclasses_path); 2081 scp_assembly_required = true; 2082 FREE_C_HEAP_ARRAY(char, altclasses_path); 2083 } 2084 2085 // Parse _JAVA_OPTIONS environment variable (if present) (mimics classic VM) 2086 result = parse_java_options_environment_variable(&scp, &scp_assembly_required); 2087 if (result != JNI_OK) { 2088 return result; 2089 } 2090 2091 // Do final processing now that all arguments have been parsed 2092 result = finalize_vm_init_args(&scp, scp_assembly_required); 2093 if (result != JNI_OK) { 2094 return result; 2095 } 2096 2097 return JNI_OK; 2098 } 2099 2100 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2101 SysClassPath* scp_p, 2102 bool* scp_assembly_required_p, 2103 FlagValueOrigin origin) { 2104 // Remaining part of option string 2105 const char* tail; 2106 2107 // iterate over arguments 2108 for (int index = 0; index < args->nOptions; index++) { 2109 bool is_absolute_path = false; // for -agentpath vs -agentlib 2110 2111 const JavaVMOption* option = args->options + index; 2112 2113 if (!match_option(option, "-Djava.class.path", &tail) && 2114 !match_option(option, "-Dsun.java.command", &tail) && 2115 !match_option(option, "-Dsun.java.launcher", &tail)) { 2116 2117 // add all jvm options to the jvm_args string. This string 2118 // is used later to set the java.vm.args PerfData string constant. 2119 // the -Djava.class.path and the -Dsun.java.command options are 2120 // omitted from jvm_args string as each have their own PerfData 2121 // string constant object. 2122 build_jvm_args(option->optionString); 2123 } 2124 2125 // -verbose:[class/gc/jni] 2126 if (match_option(option, "-verbose", &tail)) { 2127 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2128 FLAG_SET_CMDLINE(bool, TraceClassLoading, true); 2129 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2130 } else if (!strcmp(tail, ":gc")) { 2131 FLAG_SET_CMDLINE(bool, PrintGC, true); 2132 } else if (!strcmp(tail, ":jni")) { 2133 FLAG_SET_CMDLINE(bool, PrintJNIResolving, true); 2134 } 2135 // -da / -ea / -disableassertions / -enableassertions 2136 // These accept an optional class/package name separated by a colon, e.g., 2137 // -da:java.lang.Thread. 2138 } else if (match_option(option, user_assertion_options, &tail, true)) { 2139 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2140 if (*tail == '\0') { 2141 JavaAssertions::setUserClassDefault(enable); 2142 } else { 2143 assert(*tail == ':', "bogus match by match_option()"); 2144 JavaAssertions::addOption(tail + 1, enable); 2145 } 2146 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2147 } else if (match_option(option, system_assertion_options, &tail, false)) { 2148 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2149 JavaAssertions::setSystemClassDefault(enable); 2150 // -bootclasspath: 2151 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2152 scp_p->reset_path(tail); 2153 *scp_assembly_required_p = true; 2154 // -bootclasspath/a: 2155 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2156 scp_p->add_suffix(tail); 2157 *scp_assembly_required_p = true; 2158 // -bootclasspath/p: 2159 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2160 scp_p->add_prefix(tail); 2161 *scp_assembly_required_p = true; 2162 // -Xrun 2163 } else if (match_option(option, "-Xrun", &tail)) { 2164 if (tail != NULL) { 2165 const char* pos = strchr(tail, ':'); 2166 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2167 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2168 name[len] = '\0'; 2169 2170 char *options = NULL; 2171 if(pos != NULL) { 2172 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2173 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2), pos+1, len2); 2174 } 2175 #ifdef JVMTI_KERNEL 2176 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2177 warning("profiling and debugging agents are not supported with Kernel VM"); 2178 } else 2179 #endif // JVMTI_KERNEL 2180 add_init_library(name, options); 2181 } 2182 // -agentlib and -agentpath 2183 } else if (match_option(option, "-agentlib:", &tail) || 2184 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2185 if(tail != NULL) { 2186 const char* pos = strchr(tail, '='); 2187 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2188 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1), tail, len); 2189 name[len] = '\0'; 2190 2191 char *options = NULL; 2192 if(pos != NULL) { 2193 options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(pos + 1) + 1), pos + 1); 2194 } 2195 #ifdef JVMTI_KERNEL 2196 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2197 warning("profiling and debugging agents are not supported with Kernel VM"); 2198 } else 2199 #endif // JVMTI_KERNEL 2200 add_init_agent(name, options, is_absolute_path); 2201 2202 } 2203 // -javaagent 2204 } else if (match_option(option, "-javaagent:", &tail)) { 2205 if(tail != NULL) { 2206 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1), tail); 2207 add_init_agent("instrument", options, false); 2208 } 2209 // -Xnoclassgc 2210 } else if (match_option(option, "-Xnoclassgc", &tail)) { 2211 FLAG_SET_CMDLINE(bool, ClassUnloading, false); 2212 // -Xincgc: i-CMS 2213 } else if (match_option(option, "-Xincgc", &tail)) { 2214 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2215 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, true); 2216 // -Xnoincgc: no i-CMS 2217 } else if (match_option(option, "-Xnoincgc", &tail)) { 2218 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2219 FLAG_SET_CMDLINE(bool, CMSIncrementalMode, false); 2220 // -Xconcgc 2221 } else if (match_option(option, "-Xconcgc", &tail)) { 2222 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true); 2223 // -Xnoconcgc 2224 } else if (match_option(option, "-Xnoconcgc", &tail)) { 2225 FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false); 2226 // -Xbatch 2227 } else if (match_option(option, "-Xbatch", &tail)) { 2228 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2229 // -Xmn for compatibility with other JVM vendors 2230 } else if (match_option(option, "-Xmn", &tail)) { 2231 julong long_initial_eden_size = 0; 2232 ArgsRange errcode = parse_memory_size(tail, &long_initial_eden_size, 1); 2233 if (errcode != arg_in_range) { 2234 jio_fprintf(defaultStream::error_stream(), 2235 "Invalid initial eden size: %s\n", option->optionString); 2236 describe_range_error(errcode); 2237 return JNI_EINVAL; 2238 } 2239 FLAG_SET_CMDLINE(uintx, MaxNewSize, (uintx)long_initial_eden_size); 2240 FLAG_SET_CMDLINE(uintx, NewSize, (uintx)long_initial_eden_size); 2241 // -Xms 2242 } else if (match_option(option, "-Xms", &tail)) { 2243 julong long_initial_heap_size = 0; 2244 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 1); 2245 if (errcode != arg_in_range) { 2246 jio_fprintf(defaultStream::error_stream(), 2247 "Invalid initial heap size: %s\n", option->optionString); 2248 describe_range_error(errcode); 2249 return JNI_EINVAL; 2250 } 2251 FLAG_SET_CMDLINE(uintx, InitialHeapSize, (uintx)long_initial_heap_size); 2252 // Currently the minimum size and the initial heap sizes are the same. 2253 set_min_heap_size(InitialHeapSize); 2254 // -Xmx 2255 } else if (match_option(option, "-Xmx", &tail)) { 2256 julong long_max_heap_size = 0; 2257 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2258 if (errcode != arg_in_range) { 2259 jio_fprintf(defaultStream::error_stream(), 2260 "Invalid maximum heap size: %s\n", option->optionString); 2261 describe_range_error(errcode); 2262 return JNI_EINVAL; 2263 } 2264 FLAG_SET_CMDLINE(uintx, MaxHeapSize, (uintx)long_max_heap_size); 2265 // Xmaxf 2266 } else if (match_option(option, "-Xmaxf", &tail)) { 2267 int maxf = (int)(atof(tail) * 100); 2268 if (maxf < 0 || maxf > 100) { 2269 jio_fprintf(defaultStream::error_stream(), 2270 "Bad max heap free percentage size: %s\n", 2271 option->optionString); 2272 return JNI_EINVAL; 2273 } else { 2274 FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf); 2275 } 2276 // Xminf 2277 } else if (match_option(option, "-Xminf", &tail)) { 2278 int minf = (int)(atof(tail) * 100); 2279 if (minf < 0 || minf > 100) { 2280 jio_fprintf(defaultStream::error_stream(), 2281 "Bad min heap free percentage size: %s\n", 2282 option->optionString); 2283 return JNI_EINVAL; 2284 } else { 2285 FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf); 2286 } 2287 // -Xss 2288 } else if (match_option(option, "-Xss", &tail)) { 2289 julong long_ThreadStackSize = 0; 2290 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2291 if (errcode != arg_in_range) { 2292 jio_fprintf(defaultStream::error_stream(), 2293 "Invalid thread stack size: %s\n", option->optionString); 2294 describe_range_error(errcode); 2295 return JNI_EINVAL; 2296 } 2297 // Internally track ThreadStackSize in units of 1024 bytes. 2298 FLAG_SET_CMDLINE(intx, ThreadStackSize, 2299 round_to((int)long_ThreadStackSize, K) / K); 2300 // -Xoss 2301 } else if (match_option(option, "-Xoss", &tail)) { 2302 // HotSpot does not have separate native and Java stacks, ignore silently for compatibility 2303 // -Xmaxjitcodesize 2304 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2305 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2306 julong long_ReservedCodeCacheSize = 0; 2307 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 2308 (size_t)InitialCodeCacheSize); 2309 if (errcode != arg_in_range) { 2310 jio_fprintf(defaultStream::error_stream(), 2311 "Invalid maximum code cache size: %s. Should be greater than InitialCodeCacheSize=%dK\n", 2312 option->optionString, InitialCodeCacheSize/K); 2313 describe_range_error(errcode); 2314 return JNI_EINVAL; 2315 } 2316 FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize); 2317 // -green 2318 } else if (match_option(option, "-green", &tail)) { 2319 jio_fprintf(defaultStream::error_stream(), 2320 "Green threads support not available\n"); 2321 return JNI_EINVAL; 2322 // -native 2323 } else if (match_option(option, "-native", &tail)) { 2324 // HotSpot always uses native threads, ignore silently for compatibility 2325 // -Xsqnopause 2326 } else if (match_option(option, "-Xsqnopause", &tail)) { 2327 // EVM option, ignore silently for compatibility 2328 // -Xrs 2329 } else if (match_option(option, "-Xrs", &tail)) { 2330 // Classic/EVM option, new functionality 2331 FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true); 2332 } else if (match_option(option, "-Xusealtsigs", &tail)) { 2333 // change default internal VM signals used - lower case for back compat 2334 FLAG_SET_CMDLINE(bool, UseAltSigs, true); 2335 // -Xoptimize 2336 } else if (match_option(option, "-Xoptimize", &tail)) { 2337 // EVM option, ignore silently for compatibility 2338 // -Xprof 2339 } else if (match_option(option, "-Xprof", &tail)) { 2340 #ifndef FPROF_KERNEL 2341 _has_profile = true; 2342 #else // FPROF_KERNEL 2343 // do we have to exit? 2344 warning("Kernel VM does not support flat profiling."); 2345 #endif // FPROF_KERNEL 2346 // -Xaprof 2347 } else if (match_option(option, "-Xaprof", &tail)) { 2348 _has_alloc_profile = true; 2349 // -Xconcurrentio 2350 } else if (match_option(option, "-Xconcurrentio", &tail)) { 2351 FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true); 2352 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2353 FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1); 2354 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2355 FLAG_SET_CMDLINE(uintx, NewSizeThreadIncrease, 16 * K); // 20Kb per thread added to new generation 2356 2357 // -Xinternalversion 2358 } else if (match_option(option, "-Xinternalversion", &tail)) { 2359 jio_fprintf(defaultStream::output_stream(), "%s\n", 2360 VM_Version::internal_vm_info_string()); 2361 vm_exit(0); 2362 #ifndef PRODUCT 2363 // -Xprintflags 2364 } else if (match_option(option, "-Xprintflags", &tail)) { 2365 CommandLineFlags::printFlags(); 2366 vm_exit(0); 2367 #endif 2368 // -D 2369 } else if (match_option(option, "-D", &tail)) { 2370 if (!add_property(tail)) { 2371 return JNI_ENOMEM; 2372 } 2373 // Out of the box management support 2374 if (match_option(option, "-Dcom.sun.management", &tail)) { 2375 FLAG_SET_CMDLINE(bool, ManagementServer, true); 2376 } 2377 // -Xint 2378 } else if (match_option(option, "-Xint", &tail)) { 2379 set_mode_flags(_int); 2380 // -Xmixed 2381 } else if (match_option(option, "-Xmixed", &tail)) { 2382 set_mode_flags(_mixed); 2383 // -Xcomp 2384 } else if (match_option(option, "-Xcomp", &tail)) { 2385 // for testing the compiler; turn off all flags that inhibit compilation 2386 set_mode_flags(_comp); 2387 2388 // -Xshare:dump 2389 } else if (match_option(option, "-Xshare:dump", &tail)) { 2390 #ifdef TIERED 2391 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2392 set_mode_flags(_int); // Prevent compilation, which creates objects 2393 #elif defined(COMPILER2) 2394 vm_exit_during_initialization( 2395 "Dumping a shared archive is not supported on the Server JVM.", NULL); 2396 #elif defined(KERNEL) 2397 vm_exit_during_initialization( 2398 "Dumping a shared archive is not supported on the Kernel JVM.", NULL); 2399 #else 2400 FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true); 2401 set_mode_flags(_int); // Prevent compilation, which creates objects 2402 #endif 2403 // -Xshare:on 2404 } else if (match_option(option, "-Xshare:on", &tail)) { 2405 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2406 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true); 2407 #ifdef TIERED 2408 FLAG_SET_CMDLINE(bool, ForceSharedSpaces, true); 2409 #endif // TIERED 2410 // -Xshare:auto 2411 } else if (match_option(option, "-Xshare:auto", &tail)) { 2412 FLAG_SET_CMDLINE(bool, UseSharedSpaces, true); 2413 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2414 // -Xshare:off 2415 } else if (match_option(option, "-Xshare:off", &tail)) { 2416 FLAG_SET_CMDLINE(bool, UseSharedSpaces, false); 2417 FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false); 2418 2419 // -Xverify 2420 } else if (match_option(option, "-Xverify", &tail)) { 2421 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2422 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true); 2423 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2424 } else if (strcmp(tail, ":remote") == 0) { 2425 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2426 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true); 2427 } else if (strcmp(tail, ":none") == 0) { 2428 FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false); 2429 FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false); 2430 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2431 return JNI_EINVAL; 2432 } 2433 // -Xdebug 2434 } else if (match_option(option, "-Xdebug", &tail)) { 2435 // note this flag has been used, then ignore 2436 set_xdebug_mode(true); 2437 // -Xnoagent 2438 } else if (match_option(option, "-Xnoagent", &tail)) { 2439 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2440 } else if (match_option(option, "-Xboundthreads", &tail)) { 2441 // Bind user level threads to kernel threads (Solaris only) 2442 FLAG_SET_CMDLINE(bool, UseBoundThreads, true); 2443 } else if (match_option(option, "-Xloggc:", &tail)) { 2444 // Redirect GC output to the file. -Xloggc:<filename> 2445 // ostream_init_log(), when called will use this filename 2446 // to initialize a fileStream. 2447 _gc_log_filename = strdup(tail); 2448 FLAG_SET_CMDLINE(bool, PrintGC, true); 2449 FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true); 2450 FLAG_SET_CMDLINE(bool, TraceClassUnloading, true); 2451 2452 // JNI hooks 2453 } else if (match_option(option, "-Xcheck", &tail)) { 2454 if (!strcmp(tail, ":jni")) { 2455 CheckJNICalls = true; 2456 } else if (is_bad_option(option, args->ignoreUnrecognized, 2457 "check")) { 2458 return JNI_EINVAL; 2459 } 2460 } else if (match_option(option, "vfprintf", &tail)) { 2461 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2462 } else if (match_option(option, "exit", &tail)) { 2463 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2464 } else if (match_option(option, "abort", &tail)) { 2465 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2466 // -XX:+AggressiveHeap 2467 } else if (match_option(option, "-XX:+AggressiveHeap", &tail)) { 2468 2469 // This option inspects the machine and attempts to set various 2470 // parameters to be optimal for long-running, memory allocation 2471 // intensive jobs. It is intended for machines with large 2472 // amounts of cpu and memory. 2473 2474 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2475 // VM, but we may not be able to represent the total physical memory 2476 // available (like having 8gb of memory on a box but using a 32bit VM). 2477 // Thus, we need to make sure we're using a julong for intermediate 2478 // calculations. 2479 julong initHeapSize; 2480 julong total_memory = os::physical_memory(); 2481 2482 if (total_memory < (julong)256*M) { 2483 jio_fprintf(defaultStream::error_stream(), 2484 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2485 vm_exit(1); 2486 } 2487 2488 // The heap size is half of available memory, or (at most) 2489 // all of possible memory less 160mb (leaving room for the OS 2490 // when using ISM). This is the maximum; because adaptive sizing 2491 // is turned on below, the actual space used may be smaller. 2492 2493 initHeapSize = MIN2(total_memory / (julong)2, 2494 total_memory - (julong)160*M); 2495 2496 // Make sure that if we have a lot of memory we cap the 32 bit 2497 // process space. The 64bit VM version of this function is a nop. 2498 initHeapSize = os::allocatable_physical_memory(initHeapSize); 2499 2500 // The perm gen is separate but contiguous with the 2501 // object heap (and is reserved with it) so subtract it 2502 // from the heap size. 2503 if (initHeapSize > MaxPermSize) { 2504 initHeapSize = initHeapSize - MaxPermSize; 2505 } else { 2506 warning("AggressiveHeap and MaxPermSize values may conflict"); 2507 } 2508 2509 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2510 FLAG_SET_CMDLINE(uintx, MaxHeapSize, initHeapSize); 2511 FLAG_SET_CMDLINE(uintx, InitialHeapSize, initHeapSize); 2512 // Currently the minimum size and the initial heap sizes are the same. 2513 set_min_heap_size(initHeapSize); 2514 } 2515 if (FLAG_IS_DEFAULT(NewSize)) { 2516 // Make the young generation 3/8ths of the total heap. 2517 FLAG_SET_CMDLINE(uintx, NewSize, 2518 ((julong)MaxHeapSize / (julong)8) * (julong)3); 2519 FLAG_SET_CMDLINE(uintx, MaxNewSize, NewSize); 2520 } 2521 2522 FLAG_SET_DEFAULT(UseLargePages, true); 2523 2524 // Increase some data structure sizes for efficiency 2525 FLAG_SET_CMDLINE(uintx, BaseFootPrintEstimate, MaxHeapSize); 2526 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2527 FLAG_SET_CMDLINE(uintx, TLABSize, 256*K); 2528 2529 // See the OldPLABSize comment below, but replace 'after promotion' 2530 // with 'after copying'. YoungPLABSize is the size of the survivor 2531 // space per-gc-thread buffers. The default is 4kw. 2532 FLAG_SET_CMDLINE(uintx, YoungPLABSize, 256*K); // Note: this is in words 2533 2534 // OldPLABSize is the size of the buffers in the old gen that 2535 // UseParallelGC uses to promote live data that doesn't fit in the 2536 // survivor spaces. At any given time, there's one for each gc thread. 2537 // The default size is 1kw. These buffers are rarely used, since the 2538 // survivor spaces are usually big enough. For specjbb, however, there 2539 // are occasions when there's lots of live data in the young gen 2540 // and we end up promoting some of it. We don't have a definite 2541 // explanation for why bumping OldPLABSize helps, but the theory 2542 // is that a bigger PLAB results in retaining something like the 2543 // original allocation order after promotion, which improves mutator 2544 // locality. A minor effect may be that larger PLABs reduce the 2545 // number of PLAB allocation events during gc. The value of 8kw 2546 // was arrived at by experimenting with specjbb. 2547 FLAG_SET_CMDLINE(uintx, OldPLABSize, 8*K); // Note: this is in words 2548 2549 // CompilationPolicyChoice=0 causes the server compiler to adopt 2550 // a more conservative which-method-do-I-compile policy when one 2551 // of the counters maintained by the interpreter trips. The 2552 // result is reduced startup time and improved specjbb and 2553 // alacrity performance. Zero is the default, but we set it 2554 // explicitly here in case the default changes. 2555 // See runtime/compilationPolicy.*. 2556 FLAG_SET_CMDLINE(intx, CompilationPolicyChoice, 0); 2557 2558 // Enable parallel GC and adaptive generation sizing 2559 FLAG_SET_CMDLINE(bool, UseParallelGC, true); 2560 FLAG_SET_DEFAULT(ParallelGCThreads, 2561 Abstract_VM_Version::parallel_worker_threads()); 2562 2563 // Encourage steady state memory management 2564 FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100); 2565 2566 // This appears to improve mutator locality 2567 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2568 2569 // Get around early Solaris scheduling bug 2570 // (affinity vs other jobs on system) 2571 // but disallow DR and offlining (5008695). 2572 FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true); 2573 2574 } else if (match_option(option, "-XX:+NeverTenure", &tail)) { 2575 // The last option must always win. 2576 FLAG_SET_CMDLINE(bool, AlwaysTenure, false); 2577 FLAG_SET_CMDLINE(bool, NeverTenure, true); 2578 } else if (match_option(option, "-XX:+AlwaysTenure", &tail)) { 2579 // The last option must always win. 2580 FLAG_SET_CMDLINE(bool, NeverTenure, false); 2581 FLAG_SET_CMDLINE(bool, AlwaysTenure, true); 2582 } else if (match_option(option, "-XX:+CMSPermGenSweepingEnabled", &tail) || 2583 match_option(option, "-XX:-CMSPermGenSweepingEnabled", &tail)) { 2584 jio_fprintf(defaultStream::error_stream(), 2585 "Please use CMSClassUnloadingEnabled in place of " 2586 "CMSPermGenSweepingEnabled in the future\n"); 2587 } else if (match_option(option, "-XX:+UseGCTimeLimit", &tail)) { 2588 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, true); 2589 jio_fprintf(defaultStream::error_stream(), 2590 "Please use -XX:+UseGCOverheadLimit in place of " 2591 "-XX:+UseGCTimeLimit in the future\n"); 2592 } else if (match_option(option, "-XX:-UseGCTimeLimit", &tail)) { 2593 FLAG_SET_CMDLINE(bool, UseGCOverheadLimit, false); 2594 jio_fprintf(defaultStream::error_stream(), 2595 "Please use -XX:-UseGCOverheadLimit in place of " 2596 "-XX:-UseGCTimeLimit in the future\n"); 2597 // The TLE options are for compatibility with 1.3 and will be 2598 // removed without notice in a future release. These options 2599 // are not to be documented. 2600 } else if (match_option(option, "-XX:MaxTLERatio=", &tail)) { 2601 // No longer used. 2602 } else if (match_option(option, "-XX:+ResizeTLE", &tail)) { 2603 FLAG_SET_CMDLINE(bool, ResizeTLAB, true); 2604 } else if (match_option(option, "-XX:-ResizeTLE", &tail)) { 2605 FLAG_SET_CMDLINE(bool, ResizeTLAB, false); 2606 } else if (match_option(option, "-XX:+PrintTLE", &tail)) { 2607 FLAG_SET_CMDLINE(bool, PrintTLAB, true); 2608 } else if (match_option(option, "-XX:-PrintTLE", &tail)) { 2609 FLAG_SET_CMDLINE(bool, PrintTLAB, false); 2610 } else if (match_option(option, "-XX:TLEFragmentationRatio=", &tail)) { 2611 // No longer used. 2612 } else if (match_option(option, "-XX:TLESize=", &tail)) { 2613 julong long_tlab_size = 0; 2614 ArgsRange errcode = parse_memory_size(tail, &long_tlab_size, 1); 2615 if (errcode != arg_in_range) { 2616 jio_fprintf(defaultStream::error_stream(), 2617 "Invalid TLAB size: %s\n", option->optionString); 2618 describe_range_error(errcode); 2619 return JNI_EINVAL; 2620 } 2621 FLAG_SET_CMDLINE(uintx, TLABSize, long_tlab_size); 2622 } else if (match_option(option, "-XX:TLEThreadRatio=", &tail)) { 2623 // No longer used. 2624 } else if (match_option(option, "-XX:+UseTLE", &tail)) { 2625 FLAG_SET_CMDLINE(bool, UseTLAB, true); 2626 } else if (match_option(option, "-XX:-UseTLE", &tail)) { 2627 FLAG_SET_CMDLINE(bool, UseTLAB, false); 2628 SOLARIS_ONLY( 2629 } else if (match_option(option, "-XX:+UsePermISM", &tail)) { 2630 warning("-XX:+UsePermISM is obsolete."); 2631 FLAG_SET_CMDLINE(bool, UseISM, true); 2632 } else if (match_option(option, "-XX:-UsePermISM", &tail)) { 2633 FLAG_SET_CMDLINE(bool, UseISM, false); 2634 ) 2635 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr", &tail)) { 2636 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false); 2637 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true); 2638 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout", &tail)) { 2639 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false); 2640 FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true); 2641 } else if (match_option(option, "-XX:+ExtendedDTraceProbes", &tail)) { 2642 #ifdef SOLARIS 2643 FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true); 2644 FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true); 2645 FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true); 2646 FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true); 2647 #else // ndef SOLARIS 2648 jio_fprintf(defaultStream::error_stream(), 2649 "ExtendedDTraceProbes flag is only applicable on Solaris\n"); 2650 return JNI_EINVAL; 2651 #endif // ndef SOLARIS 2652 #ifdef ASSERT 2653 } else if (match_option(option, "-XX:+FullGCALot", &tail)) { 2654 FLAG_SET_CMDLINE(bool, FullGCALot, true); 2655 // disable scavenge before parallel mark-compact 2656 FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false); 2657 #endif 2658 } else if (match_option(option, "-XX:CMSParPromoteBlocksToClaim=", &tail)) { 2659 julong cms_blocks_to_claim = (julong)atol(tail); 2660 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2661 jio_fprintf(defaultStream::error_stream(), 2662 "Please use -XX:OldPLABSize in place of " 2663 "-XX:CMSParPromoteBlocksToClaim in the future\n"); 2664 } else if (match_option(option, "-XX:ParCMSPromoteBlocksToClaim=", &tail)) { 2665 julong cms_blocks_to_claim = (julong)atol(tail); 2666 FLAG_SET_CMDLINE(uintx, CMSParPromoteBlocksToClaim, cms_blocks_to_claim); 2667 jio_fprintf(defaultStream::error_stream(), 2668 "Please use -XX:OldPLABSize in place of " 2669 "-XX:ParCMSPromoteBlocksToClaim in the future\n"); 2670 } else if (match_option(option, "-XX:ParallelGCOldGenAllocBufferSize=", &tail)) { 2671 julong old_plab_size = 0; 2672 ArgsRange errcode = parse_memory_size(tail, &old_plab_size, 1); 2673 if (errcode != arg_in_range) { 2674 jio_fprintf(defaultStream::error_stream(), 2675 "Invalid old PLAB size: %s\n", option->optionString); 2676 describe_range_error(errcode); 2677 return JNI_EINVAL; 2678 } 2679 FLAG_SET_CMDLINE(uintx, OldPLABSize, old_plab_size); 2680 jio_fprintf(defaultStream::error_stream(), 2681 "Please use -XX:OldPLABSize in place of " 2682 "-XX:ParallelGCOldGenAllocBufferSize in the future\n"); 2683 } else if (match_option(option, "-XX:ParallelGCToSpaceAllocBufferSize=", &tail)) { 2684 julong young_plab_size = 0; 2685 ArgsRange errcode = parse_memory_size(tail, &young_plab_size, 1); 2686 if (errcode != arg_in_range) { 2687 jio_fprintf(defaultStream::error_stream(), 2688 "Invalid young PLAB size: %s\n", option->optionString); 2689 describe_range_error(errcode); 2690 return JNI_EINVAL; 2691 } 2692 FLAG_SET_CMDLINE(uintx, YoungPLABSize, young_plab_size); 2693 jio_fprintf(defaultStream::error_stream(), 2694 "Please use -XX:YoungPLABSize in place of " 2695 "-XX:ParallelGCToSpaceAllocBufferSize in the future\n"); 2696 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 2697 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 2698 julong stack_size = 0; 2699 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 2700 if (errcode != arg_in_range) { 2701 jio_fprintf(defaultStream::error_stream(), 2702 "Invalid mark stack size: %s\n", option->optionString); 2703 describe_range_error(errcode); 2704 return JNI_EINVAL; 2705 } 2706 FLAG_SET_CMDLINE(uintx, MarkStackSize, stack_size); 2707 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 2708 julong max_stack_size = 0; 2709 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 2710 if (errcode != arg_in_range) { 2711 jio_fprintf(defaultStream::error_stream(), 2712 "Invalid maximum mark stack size: %s\n", 2713 option->optionString); 2714 describe_range_error(errcode); 2715 return JNI_EINVAL; 2716 } 2717 FLAG_SET_CMDLINE(uintx, MarkStackSizeMax, max_stack_size); 2718 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 2719 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 2720 uintx conc_threads = 0; 2721 if (!parse_uintx(tail, &conc_threads, 1)) { 2722 jio_fprintf(defaultStream::error_stream(), 2723 "Invalid concurrent threads: %s\n", option->optionString); 2724 return JNI_EINVAL; 2725 } 2726 FLAG_SET_CMDLINE(uintx, ConcGCThreads, conc_threads); 2727 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2728 // Skip -XX:Flags= since that case has already been handled 2729 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 2730 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2731 return JNI_EINVAL; 2732 } 2733 } 2734 // Unknown option 2735 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2736 return JNI_ERR; 2737 } 2738 } 2739 // Change the default value for flags which have different default values 2740 // when working with older JDKs. 2741 if (JDK_Version::current().compare_major(6) <= 0 && 2742 FLAG_IS_DEFAULT(UseVMInterruptibleIO)) { 2743 FLAG_SET_DEFAULT(UseVMInterruptibleIO, true); 2744 } 2745 #ifdef LINUX 2746 if (JDK_Version::current().compare_major(6) <= 0 && 2747 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2748 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2749 } 2750 #endif // LINUX 2751 return JNI_OK; 2752 } 2753 2754 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 2755 // This must be done after all -D arguments have been processed. 2756 scp_p->expand_endorsed(); 2757 2758 if (scp_assembly_required || scp_p->get_endorsed() != NULL) { 2759 // Assemble the bootclasspath elements into the final path. 2760 Arguments::set_sysclasspath(scp_p->combined_path()); 2761 } 2762 2763 // This must be done after all arguments have been processed. 2764 // java_compiler() true means set to "NONE" or empty. 2765 if (java_compiler() && !xdebug_mode()) { 2766 // For backwards compatibility, we switch to interpreted mode if 2767 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 2768 // not specified. 2769 set_mode_flags(_int); 2770 } 2771 if (CompileThreshold == 0) { 2772 set_mode_flags(_int); 2773 } 2774 2775 #ifndef COMPILER2 2776 // Don't degrade server performance for footprint 2777 if (FLAG_IS_DEFAULT(UseLargePages) && 2778 MaxHeapSize < LargePageHeapSizeThreshold) { 2779 // No need for large granularity pages w/small heaps. 2780 // Note that large pages are enabled/disabled for both the 2781 // Java heap and the code cache. 2782 FLAG_SET_DEFAULT(UseLargePages, false); 2783 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseMPSS, false)); 2784 SOLARIS_ONLY(FLAG_SET_DEFAULT(UseISM, false)); 2785 } 2786 2787 // Tiered compilation is undefined with C1. 2788 TieredCompilation = false; 2789 #else 2790 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 2791 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 2792 } 2793 #endif 2794 2795 // If we are running in a headless jre, force java.awt.headless property 2796 // to be true unless the property has already been set. 2797 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 2798 if (os::is_headless_jre()) { 2799 const char* headless = Arguments::get_property("java.awt.headless"); 2800 if (headless == NULL) { 2801 char envbuffer[128]; 2802 if (!os::getenv("JAVA_AWT_HEADLESS", envbuffer, sizeof(envbuffer))) { 2803 if (!add_property("java.awt.headless=true")) { 2804 return JNI_ENOMEM; 2805 } 2806 } else { 2807 char buffer[256]; 2808 strcpy(buffer, "java.awt.headless="); 2809 strcat(buffer, envbuffer); 2810 if (!add_property(buffer)) { 2811 return JNI_ENOMEM; 2812 } 2813 } 2814 } 2815 } 2816 2817 if (!check_vm_args_consistency()) { 2818 return JNI_ERR; 2819 } 2820 2821 return JNI_OK; 2822 } 2823 2824 jint Arguments::parse_java_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2825 return parse_options_environment_variable("_JAVA_OPTIONS", scp_p, 2826 scp_assembly_required_p); 2827 } 2828 2829 jint Arguments::parse_java_tool_options_environment_variable(SysClassPath* scp_p, bool* scp_assembly_required_p) { 2830 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", scp_p, 2831 scp_assembly_required_p); 2832 } 2833 2834 jint Arguments::parse_options_environment_variable(const char* name, SysClassPath* scp_p, bool* scp_assembly_required_p) { 2835 const int N_MAX_OPTIONS = 64; 2836 const int OPTION_BUFFER_SIZE = 1024; 2837 char buffer[OPTION_BUFFER_SIZE]; 2838 2839 // The variable will be ignored if it exceeds the length of the buffer. 2840 // Don't check this variable if user has special privileges 2841 // (e.g. unix su command). 2842 if (os::getenv(name, buffer, sizeof(buffer)) && 2843 !os::have_special_privileges()) { 2844 JavaVMOption options[N_MAX_OPTIONS]; // Construct option array 2845 jio_fprintf(defaultStream::error_stream(), 2846 "Picked up %s: %s\n", name, buffer); 2847 char* rd = buffer; // pointer to the input string (rd) 2848 int i; 2849 for (i = 0; i < N_MAX_OPTIONS;) { // repeat for all options in the input string 2850 while (isspace(*rd)) rd++; // skip whitespace 2851 if (*rd == 0) break; // we re done when the input string is read completely 2852 2853 // The output, option string, overwrites the input string. 2854 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 2855 // input string (rd). 2856 char* wrt = rd; 2857 2858 options[i++].optionString = wrt; // Fill in option 2859 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 2860 if (*rd == '\'' || *rd == '"') { // handle a quoted string 2861 int quote = *rd; // matching quote to look for 2862 rd++; // don't copy open quote 2863 while (*rd != quote) { // include everything (even spaces) up until quote 2864 if (*rd == 0) { // string termination means unmatched string 2865 jio_fprintf(defaultStream::error_stream(), 2866 "Unmatched quote in %s\n", name); 2867 return JNI_ERR; 2868 } 2869 *wrt++ = *rd++; // copy to option string 2870 } 2871 rd++; // don't copy close quote 2872 } else { 2873 *wrt++ = *rd++; // copy to option string 2874 } 2875 } 2876 // Need to check if we're done before writing a NULL, 2877 // because the write could be to the byte that rd is pointing to. 2878 if (*rd++ == 0) { 2879 *wrt = 0; 2880 break; 2881 } 2882 *wrt = 0; // Zero terminate option 2883 } 2884 // Construct JavaVMInitArgs structure and parse as if it was part of the command line 2885 JavaVMInitArgs vm_args; 2886 vm_args.version = JNI_VERSION_1_2; 2887 vm_args.options = options; 2888 vm_args.nOptions = i; 2889 vm_args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2890 2891 if (PrintVMOptions) { 2892 const char* tail; 2893 for (int i = 0; i < vm_args.nOptions; i++) { 2894 const JavaVMOption *option = vm_args.options + i; 2895 if (match_option(option, "-XX:", &tail)) { 2896 logOption(tail); 2897 } 2898 } 2899 } 2900 2901 return(parse_each_vm_init_arg(&vm_args, scp_p, scp_assembly_required_p, ENVIRON_VAR)); 2902 } 2903 return JNI_OK; 2904 } 2905 2906 2907 // Parse entry point called from JNI_CreateJavaVM 2908 2909 jint Arguments::parse(const JavaVMInitArgs* args) { 2910 2911 // Sharing support 2912 // Construct the path to the archive 2913 char jvm_path[JVM_MAXPATHLEN]; 2914 os::jvm_path(jvm_path, sizeof(jvm_path)); 2915 #ifdef TIERED 2916 if (strstr(jvm_path, "client") != NULL) { 2917 force_client_mode = true; 2918 } 2919 #endif // TIERED 2920 char *end = strrchr(jvm_path, *os::file_separator()); 2921 if (end != NULL) *end = '\0'; 2922 char *shared_archive_path = NEW_C_HEAP_ARRAY(char, strlen(jvm_path) + 2923 strlen(os::file_separator()) + 20); 2924 if (shared_archive_path == NULL) return JNI_ENOMEM; 2925 strcpy(shared_archive_path, jvm_path); 2926 strcat(shared_archive_path, os::file_separator()); 2927 strcat(shared_archive_path, "classes"); 2928 DEBUG_ONLY(strcat(shared_archive_path, "_g");) 2929 strcat(shared_archive_path, ".jsa"); 2930 SharedArchivePath = shared_archive_path; 2931 2932 // Remaining part of option string 2933 const char* tail; 2934 2935 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 2936 bool settings_file_specified = false; 2937 const char* flags_file; 2938 int index; 2939 for (index = 0; index < args->nOptions; index++) { 2940 const JavaVMOption *option = args->options + index; 2941 if (match_option(option, "-XX:Flags=", &tail)) { 2942 flags_file = tail; 2943 settings_file_specified = true; 2944 } 2945 if (match_option(option, "-XX:+PrintVMOptions", &tail)) { 2946 PrintVMOptions = true; 2947 } 2948 if (match_option(option, "-XX:-PrintVMOptions", &tail)) { 2949 PrintVMOptions = false; 2950 } 2951 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions", &tail)) { 2952 IgnoreUnrecognizedVMOptions = true; 2953 } 2954 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions", &tail)) { 2955 IgnoreUnrecognizedVMOptions = false; 2956 } 2957 if (match_option(option, "-XX:+PrintFlagsInitial", &tail)) { 2958 CommandLineFlags::printFlags(); 2959 vm_exit(0); 2960 } 2961 2962 #ifndef PRODUCT 2963 if (match_option(option, "-XX:+PrintFlagsWithComments", &tail)) { 2964 CommandLineFlags::printFlags(true); 2965 vm_exit(0); 2966 } 2967 #endif 2968 } 2969 2970 if (IgnoreUnrecognizedVMOptions) { 2971 // uncast const to modify the flag args->ignoreUnrecognized 2972 *(jboolean*)(&args->ignoreUnrecognized) = true; 2973 } 2974 2975 // Parse specified settings file 2976 if (settings_file_specified) { 2977 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 2978 return JNI_EINVAL; 2979 } 2980 } 2981 2982 // Parse default .hotspotrc settings file 2983 if (!settings_file_specified) { 2984 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 2985 return JNI_EINVAL; 2986 } 2987 } 2988 2989 if (PrintVMOptions) { 2990 for (index = 0; index < args->nOptions; index++) { 2991 const JavaVMOption *option = args->options + index; 2992 if (match_option(option, "-XX:", &tail)) { 2993 logOption(tail); 2994 } 2995 } 2996 } 2997 2998 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 2999 jint result = parse_vm_init_args(args); 3000 if (result != JNI_OK) { 3001 return result; 3002 } 3003 3004 #ifndef PRODUCT 3005 if (TraceBytecodesAt != 0) { 3006 TraceBytecodes = true; 3007 } 3008 if (CountCompiledCalls) { 3009 if (UseCounterDecay) { 3010 warning("UseCounterDecay disabled because CountCalls is set"); 3011 UseCounterDecay = false; 3012 } 3013 } 3014 #endif // PRODUCT 3015 3016 if (EnableInvokeDynamic && !EnableMethodHandles) { 3017 if (!FLAG_IS_DEFAULT(EnableMethodHandles)) { 3018 warning("forcing EnableMethodHandles true because EnableInvokeDynamic is true"); 3019 } 3020 EnableMethodHandles = true; 3021 } 3022 if (EnableMethodHandles && !AnonymousClasses) { 3023 if (!FLAG_IS_DEFAULT(AnonymousClasses)) { 3024 warning("forcing AnonymousClasses true because EnableMethodHandles is true"); 3025 } 3026 AnonymousClasses = true; 3027 } 3028 if ((EnableMethodHandles || AnonymousClasses) && ScavengeRootsInCode == 0) { 3029 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3030 warning("forcing ScavengeRootsInCode non-zero because EnableMethodHandles or AnonymousClasses is true"); 3031 } 3032 ScavengeRootsInCode = 1; 3033 } 3034 3035 if (PrintGCDetails) { 3036 // Turn on -verbose:gc options as well 3037 PrintGC = true; 3038 } 3039 3040 // Set object alignment values. 3041 set_object_alignment(); 3042 3043 #ifdef SERIALGC 3044 force_serial_gc(); 3045 #endif // SERIALGC 3046 #ifdef KERNEL 3047 no_shared_spaces(); 3048 #endif // KERNEL 3049 3050 // Set flags based on ergonomics. 3051 set_ergonomics_flags(); 3052 3053 if (UseCompressedOops) { 3054 check_compressed_oops_compat(); 3055 } 3056 3057 // Check the GC selections again. 3058 if (!check_gc_consistency()) { 3059 return JNI_EINVAL; 3060 } 3061 3062 if (TieredCompilation) { 3063 set_tiered_flags(); 3064 } else { 3065 // Check if the policy is valid. Policies 0 and 1 are valid for non-tiered setup. 3066 if (CompilationPolicyChoice >= 2) { 3067 vm_exit_during_initialization( 3068 "Incompatible compilation policy selected", NULL); 3069 } 3070 } 3071 3072 #ifndef KERNEL 3073 if (UseConcMarkSweepGC) { 3074 // Set flags for CMS and ParNew. Check UseConcMarkSweep first 3075 // to ensure that when both UseConcMarkSweepGC and UseParNewGC 3076 // are true, we don't call set_parnew_gc_flags() as well. 3077 set_cms_and_parnew_gc_flags(); 3078 } else { 3079 // Set heap size based on available physical memory 3080 set_heap_size(); 3081 // Set per-collector flags 3082 if (UseParallelGC || UseParallelOldGC) { 3083 set_parallel_gc_flags(); 3084 } else if (UseParNewGC) { 3085 set_parnew_gc_flags(); 3086 } else if (UseG1GC) { 3087 set_g1_gc_flags(); 3088 } 3089 } 3090 #endif // KERNEL 3091 3092 #ifdef SERIALGC 3093 assert(verify_serial_gc_flags(), "SerialGC unset"); 3094 #endif // SERIALGC 3095 3096 // Set bytecode rewriting flags 3097 set_bytecode_flags(); 3098 3099 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled. 3100 set_aggressive_opts_flags(); 3101 3102 #ifdef CC_INTERP 3103 // Clear flags not supported by the C++ interpreter 3104 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3105 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3106 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3107 #endif // CC_INTERP 3108 3109 #ifdef COMPILER2 3110 if (!UseBiasedLocking || EmitSync != 0) { 3111 UseOptoBiasInlining = false; 3112 } 3113 #endif 3114 3115 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3116 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3117 DebugNonSafepoints = true; 3118 } 3119 3120 #ifndef PRODUCT 3121 if (CompileTheWorld) { 3122 // Force NmethodSweeper to sweep whole CodeCache each time. 3123 if (FLAG_IS_DEFAULT(NmethodSweepFraction)) { 3124 NmethodSweepFraction = 1; 3125 } 3126 } 3127 #endif 3128 3129 if (PrintCommandLineFlags) { 3130 CommandLineFlags::printSetFlags(); 3131 } 3132 3133 // Apply CPU specific policy for the BiasedLocking 3134 if (UseBiasedLocking) { 3135 if (!VM_Version::use_biased_locking() && 3136 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3137 UseBiasedLocking = false; 3138 } 3139 } 3140 3141 return JNI_OK; 3142 } 3143 3144 int Arguments::PropertyList_count(SystemProperty* pl) { 3145 int count = 0; 3146 while(pl != NULL) { 3147 count++; 3148 pl = pl->next(); 3149 } 3150 return count; 3151 } 3152 3153 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3154 assert(key != NULL, "just checking"); 3155 SystemProperty* prop; 3156 for (prop = pl; prop != NULL; prop = prop->next()) { 3157 if (strcmp(key, prop->key()) == 0) return prop->value(); 3158 } 3159 return NULL; 3160 } 3161 3162 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 3163 int count = 0; 3164 const char* ret_val = NULL; 3165 3166 while(pl != NULL) { 3167 if(count >= index) { 3168 ret_val = pl->key(); 3169 break; 3170 } 3171 count++; 3172 pl = pl->next(); 3173 } 3174 3175 return ret_val; 3176 } 3177 3178 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 3179 int count = 0; 3180 char* ret_val = NULL; 3181 3182 while(pl != NULL) { 3183 if(count >= index) { 3184 ret_val = pl->value(); 3185 break; 3186 } 3187 count++; 3188 pl = pl->next(); 3189 } 3190 3191 return ret_val; 3192 } 3193 3194 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3195 SystemProperty* p = *plist; 3196 if (p == NULL) { 3197 *plist = new_p; 3198 } else { 3199 while (p->next() != NULL) { 3200 p = p->next(); 3201 } 3202 p->set_next(new_p); 3203 } 3204 } 3205 3206 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 3207 if (plist == NULL) 3208 return; 3209 3210 SystemProperty* new_p = new SystemProperty(k, v, true); 3211 PropertyList_add(plist, new_p); 3212 } 3213 3214 // This add maintains unique property key in the list. 3215 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 3216 if (plist == NULL) 3217 return; 3218 3219 // If property key exist then update with new value. 3220 SystemProperty* prop; 3221 for (prop = *plist; prop != NULL; prop = prop->next()) { 3222 if (strcmp(k, prop->key()) == 0) { 3223 if (append) { 3224 prop->append_value(v); 3225 } else { 3226 prop->set_value(v); 3227 } 3228 return; 3229 } 3230 } 3231 3232 PropertyList_add(plist, k, v); 3233 } 3234 3235 #ifdef KERNEL 3236 char *Arguments::get_kernel_properties() { 3237 // Find properties starting with kernel and append them to string 3238 // We need to find out how long they are first because the URL's that they 3239 // might point to could get long. 3240 int length = 0; 3241 SystemProperty* prop; 3242 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3243 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3244 length += (strlen(prop->key()) + strlen(prop->value()) + 5); // "-D =" 3245 } 3246 } 3247 // Add one for null terminator. 3248 char *props = AllocateHeap(length + 1, "get_kernel_properties"); 3249 if (length != 0) { 3250 int pos = 0; 3251 for (prop = _system_properties; prop != NULL; prop = prop->next()) { 3252 if (strncmp(prop->key(), "kernel.", 7 ) == 0) { 3253 jio_snprintf(&props[pos], length-pos, 3254 "-D%s=%s ", prop->key(), prop->value()); 3255 pos = strlen(props); 3256 } 3257 } 3258 } 3259 // null terminate props in case of null 3260 props[length] = '\0'; 3261 return props; 3262 } 3263 #endif // KERNEL 3264 3265 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3266 // Returns true if all of the source pointed by src has been copied over to 3267 // the destination buffer pointed by buf. Otherwise, returns false. 3268 // Notes: 3269 // 1. If the length (buflen) of the destination buffer excluding the 3270 // NULL terminator character is not long enough for holding the expanded 3271 // pid characters, it also returns false instead of returning the partially 3272 // expanded one. 3273 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3274 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3275 char* buf, size_t buflen) { 3276 const char* p = src; 3277 char* b = buf; 3278 const char* src_end = &src[srclen]; 3279 char* buf_end = &buf[buflen - 1]; 3280 3281 while (p < src_end && b < buf_end) { 3282 if (*p == '%') { 3283 switch (*(++p)) { 3284 case '%': // "%%" ==> "%" 3285 *b++ = *p++; 3286 break; 3287 case 'p': { // "%p" ==> current process id 3288 // buf_end points to the character before the last character so 3289 // that we could write '\0' to the end of the buffer. 3290 size_t buf_sz = buf_end - b + 1; 3291 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3292 3293 // if jio_snprintf fails or the buffer is not long enough to hold 3294 // the expanded pid, returns false. 3295 if (ret < 0 || ret >= (int)buf_sz) { 3296 return false; 3297 } else { 3298 b += ret; 3299 assert(*b == '\0', "fail in copy_expand_pid"); 3300 if (p == src_end && b == buf_end + 1) { 3301 // reach the end of the buffer. 3302 return true; 3303 } 3304 } 3305 p++; 3306 break; 3307 } 3308 default : 3309 *b++ = '%'; 3310 } 3311 } else { 3312 *b++ = *p++; 3313 } 3314 } 3315 *b = '\0'; 3316 return (p == src_end); // return false if not all of the source was copied 3317 }