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