1 /* 2 * Copyright (c) 1997, 2015, 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/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/stringTable.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "code/codeCacheExtensions.hpp" 31 #include "compiler/compilerOracle.hpp" 32 #include "gc/shared/cardTableRS.hpp" 33 #include "gc/shared/genCollectedHeap.hpp" 34 #include "gc/shared/referenceProcessor.hpp" 35 #include "gc/shared/taskqueue.hpp" 36 #include "memory/allocation.inline.hpp" 37 #include "memory/universe.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "prims/jvmtiExport.hpp" 40 #include "runtime/arguments.hpp" 41 #include "runtime/arguments_ext.hpp" 42 #include "runtime/commandLineFlagConstraintList.hpp" 43 #include "runtime/commandLineFlagRangeList.hpp" 44 #include "runtime/globals.hpp" 45 #include "runtime/globals_extension.hpp" 46 #include "runtime/java.hpp" 47 #include "runtime/os.hpp" 48 #include "runtime/vm_version.hpp" 49 #include "services/management.hpp" 50 #include "services/memTracker.hpp" 51 #include "utilities/defaultStream.hpp" 52 #include "utilities/macros.hpp" 53 #include "utilities/stringUtils.hpp" 54 #if INCLUDE_ALL_GCS 55 #include "gc/cms/compactibleFreeListSpace.hpp" 56 #include "gc/g1/g1CollectedHeap.inline.hpp" 57 #include "gc/parallel/parallelScavengeHeap.hpp" 58 #endif // INCLUDE_ALL_GCS 59 60 // Note: This is a special bug reporting site for the JVM 61 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 62 #define DEFAULT_JAVA_LAUNCHER "generic" 63 64 #define UNSUPPORTED_GC_OPTION(gc) \ 65 do { \ 66 if (gc) { \ 67 if (FLAG_IS_CMDLINE(gc)) { \ 68 warning(#gc " is not supported in this VM. Using Serial GC."); \ 69 } \ 70 FLAG_SET_DEFAULT(gc, false); \ 71 } \ 72 } while(0) 73 74 char** Arguments::_jvm_flags_array = NULL; 75 int Arguments::_num_jvm_flags = 0; 76 char** Arguments::_jvm_args_array = NULL; 77 int Arguments::_num_jvm_args = 0; 78 char* Arguments::_java_command = NULL; 79 SystemProperty* Arguments::_system_properties = NULL; 80 const char* Arguments::_gc_log_filename = NULL; 81 bool Arguments::_has_profile = false; 82 size_t Arguments::_conservative_max_heap_alignment = 0; 83 size_t Arguments::_min_heap_size = 0; 84 uintx Arguments::_min_heap_free_ratio = 0; 85 uintx Arguments::_max_heap_free_ratio = 0; 86 Arguments::Mode Arguments::_mode = _mixed; 87 bool Arguments::_java_compiler = false; 88 bool Arguments::_xdebug_mode = false; 89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 91 int Arguments::_sun_java_launcher_pid = -1; 92 bool Arguments::_sun_java_launcher_is_altjvm = false; 93 94 // These parameters are reset in method parse_vm_init_args() 95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 97 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 98 bool Arguments::_ClipInlining = ClipInlining; 99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 101 102 char* Arguments::SharedArchivePath = NULL; 103 104 AgentLibraryList Arguments::_libraryList; 105 AgentLibraryList Arguments::_agentList; 106 107 abort_hook_t Arguments::_abort_hook = NULL; 108 exit_hook_t Arguments::_exit_hook = NULL; 109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 110 111 112 SystemProperty *Arguments::_sun_boot_library_path = NULL; 113 SystemProperty *Arguments::_java_library_path = NULL; 114 SystemProperty *Arguments::_java_home = NULL; 115 SystemProperty *Arguments::_java_class_path = NULL; 116 SystemProperty *Arguments::_sun_boot_class_path = NULL; 117 118 char* Arguments::_ext_dirs = NULL; 119 120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 121 // part of the option string. 122 static bool match_option(const JavaVMOption *option, const char* name, 123 const char** tail) { 124 int len = (int)strlen(name); 125 if (strncmp(option->optionString, name, len) == 0) { 126 *tail = option->optionString + len; 127 return true; 128 } else { 129 return false; 130 } 131 } 132 133 // Check if 'option' matches 'name'. No "tail" is allowed. 134 static bool match_option(const JavaVMOption *option, const char* name) { 135 const char* tail = NULL; 136 bool result = match_option(option, name, &tail); 137 if (tail != NULL && *tail == '\0') { 138 return result; 139 } else { 140 return false; 141 } 142 } 143 144 // Return true if any of the strings in null-terminated array 'names' matches. 145 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 146 // the option must match exactly. 147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 148 bool tail_allowed) { 149 for (/* empty */; *names != NULL; ++names) { 150 if (match_option(option, *names, tail)) { 151 if (**tail == '\0' || tail_allowed && **tail == ':') { 152 return true; 153 } 154 } 155 } 156 return false; 157 } 158 159 static void logOption(const char* opt) { 160 if (PrintVMOptions) { 161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 162 } 163 } 164 165 // Process java launcher properties. 166 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 167 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 168 // sun.java.launcher.pid is defined. 169 // Must do this before setting up other system properties, 170 // as some of them may depend on launcher type. 171 for (int index = 0; index < args->nOptions; index++) { 172 const JavaVMOption* option = args->options + index; 173 const char* tail; 174 175 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 176 process_java_launcher_argument(tail, option->extraInfo); 177 continue; 178 } 179 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 180 if (strcmp(tail, "true") == 0) { 181 _sun_java_launcher_is_altjvm = true; 182 } 183 continue; 184 } 185 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 186 _sun_java_launcher_pid = atoi(tail); 187 continue; 188 } 189 } 190 } 191 192 // Initialize system properties key and value. 193 void Arguments::init_system_properties() { 194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 195 "Java Virtual Machine Specification", false)); 196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 197 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 198 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 199 200 // Following are JVMTI agent writable properties. 201 // Properties values are set to NULL and they are 202 // os specific they are initialized in os::init_system_properties_values(). 203 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 204 _java_library_path = new SystemProperty("java.library.path", NULL, true); 205 _java_home = new SystemProperty("java.home", NULL, true); 206 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 207 208 _java_class_path = new SystemProperty("java.class.path", "", true); 209 210 // Add to System Property list. 211 PropertyList_add(&_system_properties, _sun_boot_library_path); 212 PropertyList_add(&_system_properties, _java_library_path); 213 PropertyList_add(&_system_properties, _java_home); 214 PropertyList_add(&_system_properties, _java_class_path); 215 PropertyList_add(&_system_properties, _sun_boot_class_path); 216 217 // Set OS specific system properties values 218 os::init_system_properties_values(); 219 } 220 221 // Update/Initialize System properties after JDK version number is known 222 void Arguments::init_version_specific_system_properties() { 223 enum { bufsz = 16 }; 224 char buffer[bufsz]; 225 const char* spec_vendor = "Sun Microsystems Inc."; 226 uint32_t spec_version = 0; 227 228 spec_vendor = "Oracle Corporation"; 229 spec_version = JDK_Version::current().major_version(); 230 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 231 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 234 PropertyList_add(&_system_properties, 235 new SystemProperty("java.vm.specification.version", buffer, false)); 236 PropertyList_add(&_system_properties, 237 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 238 } 239 240 /** 241 * Provide a slightly more user-friendly way of eliminating -XX flags. 242 * When a flag is eliminated, it can be added to this list in order to 243 * continue accepting this flag on the command-line, while issuing a warning 244 * and ignoring the value. Once the JDK version reaches the 'accept_until' 245 * limit, we flatly refuse to admit the existence of the flag. This allows 246 * a flag to die correctly over JDK releases using HSX. 247 * But now that HSX is no longer supported only options with a future 248 * accept_until value need to be listed, and the list can be pruned 249 * on each major release. 250 */ 251 typedef struct { 252 const char* name; 253 JDK_Version obsoleted_in; // when the flag went away 254 JDK_Version accept_until; // which version to start denying the existence 255 } ObsoleteFlag; 256 257 static ObsoleteFlag obsolete_jvm_flags[] = { 258 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 259 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 260 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 261 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 262 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 263 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 264 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 265 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 266 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 267 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 268 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 269 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 270 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 271 #ifndef ZERO 272 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 273 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 274 #endif // ZERO 275 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 276 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 277 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 278 { "ThreadSafetyMargin", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 279 { "LazyBootClassLoader", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 280 { "StarvationMonitorInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 281 { "PreInflateSpin", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 282 { NULL, JDK_Version(0), JDK_Version(0) } 283 }; 284 285 // Returns true if the flag is obsolete and fits into the range specified 286 // for being ignored. In the case that the flag is ignored, the 'version' 287 // value is filled in with the version number when the flag became 288 // obsolete so that that value can be displayed to the user. 289 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 290 int i = 0; 291 assert(version != NULL, "Must provide a version buffer"); 292 while (obsolete_jvm_flags[i].name != NULL) { 293 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 294 // <flag>=xxx form 295 // [-|+]<flag> form 296 size_t len = strlen(flag_status.name); 297 if ((strncmp(flag_status.name, s, len) == 0) && 298 (strlen(s) == len)){ 299 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 300 *version = flag_status.obsoleted_in; 301 return true; 302 } 303 } 304 i++; 305 } 306 return false; 307 } 308 309 // Constructs the system class path (aka boot class path) from the following 310 // components, in order: 311 // 312 // prefix // from -Xbootclasspath/p:... 313 // base // from os::get_system_properties() or -Xbootclasspath= 314 // suffix // from -Xbootclasspath/a:... 315 // 316 // This could be AllStatic, but it isn't needed after argument processing is 317 // complete. 318 class SysClassPath: public StackObj { 319 public: 320 SysClassPath(const char* base); 321 ~SysClassPath(); 322 323 inline void set_base(const char* base); 324 inline void add_prefix(const char* prefix); 325 inline void add_suffix_to_prefix(const char* suffix); 326 inline void add_suffix(const char* suffix); 327 inline void reset_path(const char* base); 328 329 inline const char* get_base() const { return _items[_scp_base]; } 330 inline const char* get_prefix() const { return _items[_scp_prefix]; } 331 inline const char* get_suffix() const { return _items[_scp_suffix]; } 332 333 // Combine all the components into a single c-heap-allocated string; caller 334 // must free the string if/when no longer needed. 335 char* combined_path(); 336 337 private: 338 // Utility routines. 339 static char* add_to_path(const char* path, const char* str, bool prepend); 340 static char* add_jars_to_path(char* path, const char* directory); 341 342 inline void reset_item_at(int index); 343 344 // Array indices for the items that make up the sysclasspath. All except the 345 // base are allocated in the C heap and freed by this class. 346 enum { 347 _scp_prefix, // from -Xbootclasspath/p:... 348 _scp_base, // the default sysclasspath 349 _scp_suffix, // from -Xbootclasspath/a:... 350 _scp_nitems // the number of items, must be last. 351 }; 352 353 const char* _items[_scp_nitems]; 354 }; 355 356 SysClassPath::SysClassPath(const char* base) { 357 memset(_items, 0, sizeof(_items)); 358 _items[_scp_base] = base; 359 } 360 361 SysClassPath::~SysClassPath() { 362 // Free everything except the base. 363 for (int i = 0; i < _scp_nitems; ++i) { 364 if (i != _scp_base) reset_item_at(i); 365 } 366 } 367 368 inline void SysClassPath::set_base(const char* base) { 369 _items[_scp_base] = base; 370 } 371 372 inline void SysClassPath::add_prefix(const char* prefix) { 373 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 374 } 375 376 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 377 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 378 } 379 380 inline void SysClassPath::add_suffix(const char* suffix) { 381 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 382 } 383 384 inline void SysClassPath::reset_item_at(int index) { 385 assert(index < _scp_nitems && index != _scp_base, "just checking"); 386 if (_items[index] != NULL) { 387 FREE_C_HEAP_ARRAY(char, _items[index]); 388 _items[index] = NULL; 389 } 390 } 391 392 inline void SysClassPath::reset_path(const char* base) { 393 // Clear the prefix and suffix. 394 reset_item_at(_scp_prefix); 395 reset_item_at(_scp_suffix); 396 set_base(base); 397 } 398 399 //------------------------------------------------------------------------------ 400 401 402 // Combine the bootclasspath elements, some of which may be null, into a single 403 // c-heap-allocated string. 404 char* SysClassPath::combined_path() { 405 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 406 407 size_t lengths[_scp_nitems]; 408 size_t total_len = 0; 409 410 const char separator = *os::path_separator(); 411 412 // Get the lengths. 413 int i; 414 for (i = 0; i < _scp_nitems; ++i) { 415 if (_items[i] != NULL) { 416 lengths[i] = strlen(_items[i]); 417 // Include space for the separator char (or a NULL for the last item). 418 total_len += lengths[i] + 1; 419 } 420 } 421 assert(total_len > 0, "empty sysclasspath not allowed"); 422 423 // Copy the _items to a single string. 424 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 425 char* cp_tmp = cp; 426 for (i = 0; i < _scp_nitems; ++i) { 427 if (_items[i] != NULL) { 428 memcpy(cp_tmp, _items[i], lengths[i]); 429 cp_tmp += lengths[i]; 430 *cp_tmp++ = separator; 431 } 432 } 433 *--cp_tmp = '\0'; // Replace the extra separator. 434 return cp; 435 } 436 437 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 438 char* 439 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 440 char *cp; 441 442 assert(str != NULL, "just checking"); 443 if (path == NULL) { 444 size_t len = strlen(str) + 1; 445 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 446 memcpy(cp, str, len); // copy the trailing null 447 } else { 448 const char separator = *os::path_separator(); 449 size_t old_len = strlen(path); 450 size_t str_len = strlen(str); 451 size_t len = old_len + str_len + 2; 452 453 if (prepend) { 454 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 455 char* cp_tmp = cp; 456 memcpy(cp_tmp, str, str_len); 457 cp_tmp += str_len; 458 *cp_tmp = separator; 459 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 460 FREE_C_HEAP_ARRAY(char, path); 461 } else { 462 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 463 char* cp_tmp = cp + old_len; 464 *cp_tmp = separator; 465 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 466 } 467 } 468 return cp; 469 } 470 471 // Scan the directory and append any jar or zip files found to path. 472 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 473 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 474 DIR* dir = os::opendir(directory); 475 if (dir == NULL) return path; 476 477 char dir_sep[2] = { '\0', '\0' }; 478 size_t directory_len = strlen(directory); 479 const char fileSep = *os::file_separator(); 480 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 481 482 /* Scan the directory for jars/zips, appending them to path. */ 483 struct dirent *entry; 484 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 485 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 486 const char* name = entry->d_name; 487 const char* ext = name + strlen(name) - 4; 488 bool isJarOrZip = ext > name && 489 (os::file_name_strcmp(ext, ".jar") == 0 || 490 os::file_name_strcmp(ext, ".zip") == 0); 491 if (isJarOrZip) { 492 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 493 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 494 path = add_to_path(path, jarpath, false); 495 FREE_C_HEAP_ARRAY(char, jarpath); 496 } 497 } 498 FREE_C_HEAP_ARRAY(char, dbuf); 499 os::closedir(dir); 500 return path; 501 } 502 503 // Parses a memory size specification string. 504 static bool atomull(const char *s, julong* result) { 505 julong n = 0; 506 int args_read = 0; 507 bool is_hex = false; 508 // Skip leading 0[xX] for hexadecimal 509 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 510 s += 2; 511 is_hex = true; 512 args_read = sscanf(s, JULONG_FORMAT_X, &n); 513 } else { 514 args_read = sscanf(s, JULONG_FORMAT, &n); 515 } 516 if (args_read != 1) { 517 return false; 518 } 519 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*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, Flag::Flags origin) { 578 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 579 return true; 580 } else { 581 return false; 582 } 583 } 584 585 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 586 double v; 587 if (sscanf(value, "%lf", &v) != 1) { 588 return false; 589 } 590 591 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 592 return true; 593 } 594 return false; 595 } 596 597 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 598 julong v; 599 int int_v; 600 intx intx_v; 601 bool is_neg = false; 602 // Check the sign first since atomull() parses only unsigned values. 603 if (*value == '-') { 604 if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) { 605 return false; 606 } 607 value++; 608 is_neg = true; 609 } 610 if (!atomull(value, &v)) { 611 return false; 612 } 613 int_v = (int) v; 614 if (is_neg) { 615 int_v = -int_v; 616 } 617 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) { 618 return true; 619 } 620 uint uint_v = (uint) v; 621 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) { 622 return true; 623 } 624 intx_v = (intx) v; 625 if (is_neg) { 626 intx_v = -intx_v; 627 } 628 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) { 629 return true; 630 } 631 uintx uintx_v = (uintx) v; 632 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) { 633 return true; 634 } 635 uint64_t uint64_t_v = (uint64_t) v; 636 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) { 637 return true; 638 } 639 size_t size_t_v = (size_t) v; 640 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) { 641 return true; 642 } 643 return false; 644 } 645 646 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 647 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 648 // Contract: CommandLineFlags always returns a pointer that needs freeing. 649 FREE_C_HEAP_ARRAY(char, value); 650 return true; 651 } 652 653 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 654 const char* old_value = ""; 655 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 656 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 657 size_t new_len = strlen(new_value); 658 const char* value; 659 char* free_this_too = NULL; 660 if (old_len == 0) { 661 value = new_value; 662 } else if (new_len == 0) { 663 value = old_value; 664 } else { 665 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 666 // each new setting adds another LINE to the switch: 667 sprintf(buf, "%s\n%s", old_value, new_value); 668 value = buf; 669 free_this_too = buf; 670 } 671 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 672 // CommandLineFlags always returns a pointer that needs freeing. 673 FREE_C_HEAP_ARRAY(char, value); 674 if (free_this_too != NULL) { 675 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 676 FREE_C_HEAP_ARRAY(char, free_this_too); 677 } 678 return true; 679 } 680 681 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 682 683 // range of acceptable characters spelled out for portability reasons 684 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 685 #define BUFLEN 255 686 char name[BUFLEN+1]; 687 char dummy; 688 689 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 690 return set_bool_flag(name, false, origin); 691 } 692 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 693 return set_bool_flag(name, true, origin); 694 } 695 696 char punct; 697 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 698 const char* value = strchr(arg, '=') + 1; 699 Flag* flag = Flag::find_flag(name, strlen(name)); 700 if (flag != NULL && flag->is_ccstr()) { 701 if (flag->ccstr_accumulates()) { 702 return append_to_string_flag(name, value, origin); 703 } else { 704 if (value[0] == '\0') { 705 value = NULL; 706 } 707 return set_string_flag(name, value, origin); 708 } 709 } 710 } 711 712 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 713 const char* value = strchr(arg, '=') + 1; 714 // -XX:Foo:=xxx will reset the string flag to the given value. 715 if (value[0] == '\0') { 716 value = NULL; 717 } 718 return set_string_flag(name, value, origin); 719 } 720 721 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 722 #define SIGNED_NUMBER_RANGE "[-0123456789]" 723 #define NUMBER_RANGE "[0123456789]" 724 char value[BUFLEN + 1]; 725 char value2[BUFLEN + 1]; 726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 727 // Looks like a floating-point number -- try again with more lenient format string 728 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 729 return set_fp_numeric_flag(name, value, origin); 730 } 731 } 732 733 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 734 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 735 return set_numeric_flag(name, value, origin); 736 } 737 738 return false; 739 } 740 741 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 742 assert(bldarray != NULL, "illegal argument"); 743 744 if (arg == NULL) { 745 return; 746 } 747 748 int new_count = *count + 1; 749 750 // expand the array and add arg to the last element 751 if (*bldarray == NULL) { 752 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 753 } else { 754 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 755 } 756 (*bldarray)[*count] = os::strdup_check_oom(arg); 757 *count = new_count; 758 } 759 760 void Arguments::build_jvm_args(const char* arg) { 761 add_string(&_jvm_args_array, &_num_jvm_args, arg); 762 } 763 764 void Arguments::build_jvm_flags(const char* arg) { 765 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 766 } 767 768 // utility function to return a string that concatenates all 769 // strings in a given char** array 770 const char* Arguments::build_resource_string(char** args, int count) { 771 if (args == NULL || count == 0) { 772 return NULL; 773 } 774 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 775 for (int i = 1; i < count; i++) { 776 length += strlen(args[i]) + 1; // add 1 for a space 777 } 778 char* s = NEW_RESOURCE_ARRAY(char, length); 779 strcpy(s, args[0]); 780 for (int j = 1; j < count; j++) { 781 strcat(s, " "); 782 strcat(s, args[j]); 783 } 784 return (const char*) s; 785 } 786 787 void Arguments::print_on(outputStream* st) { 788 st->print_cr("VM Arguments:"); 789 if (num_jvm_flags() > 0) { 790 st->print("jvm_flags: "); print_jvm_flags_on(st); 791 } 792 if (num_jvm_args() > 0) { 793 st->print("jvm_args: "); print_jvm_args_on(st); 794 } 795 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 796 if (_java_class_path != NULL) { 797 char* path = _java_class_path->value(); 798 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 799 } 800 st->print_cr("Launcher Type: %s", _sun_java_launcher); 801 } 802 803 void Arguments::print_jvm_flags_on(outputStream* st) { 804 if (_num_jvm_flags > 0) { 805 for (int i=0; i < _num_jvm_flags; i++) { 806 st->print("%s ", _jvm_flags_array[i]); 807 } 808 st->cr(); 809 } 810 } 811 812 void Arguments::print_jvm_args_on(outputStream* st) { 813 if (_num_jvm_args > 0) { 814 for (int i=0; i < _num_jvm_args; i++) { 815 st->print("%s ", _jvm_args_array[i]); 816 } 817 st->cr(); 818 } 819 } 820 821 bool Arguments::process_argument(const char* arg, 822 jboolean ignore_unrecognized, Flag::Flags origin) { 823 824 JDK_Version since = JDK_Version(); 825 826 if (parse_argument(arg, origin) || ignore_unrecognized) { 827 return true; 828 } 829 830 // Determine if the flag has '+', '-', or '=' characters. 831 bool has_plus_minus = (*arg == '+' || *arg == '-'); 832 const char* const argname = has_plus_minus ? arg + 1 : arg; 833 834 size_t arg_len; 835 const char* equal_sign = strchr(argname, '='); 836 if (equal_sign == NULL) { 837 arg_len = strlen(argname); 838 } else { 839 arg_len = equal_sign - argname; 840 } 841 842 // Only make the obsolete check for valid arguments. 843 if (arg_len <= BUFLEN) { 844 // Construct a string which consists only of the argument name without '+', '-', or '='. 845 char stripped_argname[BUFLEN+1]; 846 strncpy(stripped_argname, argname, arg_len); 847 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate. 848 849 if (is_newly_obsolete(stripped_argname, &since)) { 850 char version[256]; 851 since.to_string(version, sizeof(version)); 852 warning("ignoring option %s; support was removed in %s", stripped_argname, version); 853 return true; 854 } 855 } 856 857 // For locked flags, report a custom error message if available. 858 // Otherwise, report the standard unrecognized VM option. 859 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 860 if (found_flag != NULL) { 861 char locked_message_buf[BUFLEN]; 862 found_flag->get_locked_message(locked_message_buf, BUFLEN); 863 if (strlen(locked_message_buf) == 0) { 864 if (found_flag->is_bool() && !has_plus_minus) { 865 jio_fprintf(defaultStream::error_stream(), 866 "Missing +/- setting for VM option '%s'\n", argname); 867 } else if (!found_flag->is_bool() && has_plus_minus) { 868 jio_fprintf(defaultStream::error_stream(), 869 "Unexpected +/- setting in VM option '%s'\n", argname); 870 } else { 871 jio_fprintf(defaultStream::error_stream(), 872 "Improperly specified VM option '%s'\n", argname); 873 } 874 } else { 875 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 876 } 877 } else { 878 jio_fprintf(defaultStream::error_stream(), 879 "Unrecognized VM option '%s'\n", argname); 880 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 881 if (fuzzy_matched != NULL) { 882 jio_fprintf(defaultStream::error_stream(), 883 "Did you mean '%s%s%s'? ", 884 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 885 fuzzy_matched->_name, 886 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 887 } 888 } 889 890 // allow for commandline "commenting out" options like -XX:#+Verbose 891 return arg[0] == '#'; 892 } 893 894 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 895 FILE* stream = fopen(file_name, "rb"); 896 if (stream == NULL) { 897 if (should_exist) { 898 jio_fprintf(defaultStream::error_stream(), 899 "Could not open settings file %s\n", file_name); 900 return false; 901 } else { 902 return true; 903 } 904 } 905 906 char token[1024]; 907 int pos = 0; 908 909 bool in_white_space = true; 910 bool in_comment = false; 911 bool in_quote = false; 912 char quote_c = 0; 913 bool result = true; 914 915 int c = getc(stream); 916 while(c != EOF && pos < (int)(sizeof(token)-1)) { 917 if (in_white_space) { 918 if (in_comment) { 919 if (c == '\n') in_comment = false; 920 } else { 921 if (c == '#') in_comment = true; 922 else if (!isspace(c)) { 923 in_white_space = false; 924 token[pos++] = c; 925 } 926 } 927 } else { 928 if (c == '\n' || (!in_quote && isspace(c))) { 929 // token ends at newline, or at unquoted whitespace 930 // this allows a way to include spaces in string-valued options 931 token[pos] = '\0'; 932 logOption(token); 933 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 934 build_jvm_flags(token); 935 pos = 0; 936 in_white_space = true; 937 in_quote = false; 938 } else if (!in_quote && (c == '\'' || c == '"')) { 939 in_quote = true; 940 quote_c = c; 941 } else if (in_quote && (c == quote_c)) { 942 in_quote = false; 943 } else { 944 token[pos++] = c; 945 } 946 } 947 c = getc(stream); 948 } 949 if (pos > 0) { 950 token[pos] = '\0'; 951 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 952 build_jvm_flags(token); 953 } 954 fclose(stream); 955 return result; 956 } 957 958 //============================================================================================================= 959 // Parsing of properties (-D) 960 961 const char* Arguments::get_property(const char* key) { 962 return PropertyList_get_value(system_properties(), key); 963 } 964 965 bool Arguments::add_property(const char* prop) { 966 const char* eq = strchr(prop, '='); 967 char* key; 968 // ns must be static--its address may be stored in a SystemProperty object. 969 const static char ns[1] = {0}; 970 char* value = (char *)ns; 971 972 size_t key_len = (eq == NULL) ? strlen(prop) : (eq - prop); 973 key = AllocateHeap(key_len + 1, mtInternal); 974 strncpy(key, prop, key_len); 975 key[key_len] = '\0'; 976 977 if (eq != NULL) { 978 size_t value_len = strlen(prop) - key_len - 1; 979 value = AllocateHeap(value_len + 1, mtInternal); 980 strncpy(value, &prop[key_len + 1], value_len + 1); 981 } 982 983 if (strcmp(key, "java.compiler") == 0) { 984 process_java_compiler_argument(value); 985 FreeHeap(key); 986 if (eq != NULL) { 987 FreeHeap(value); 988 } 989 return true; 990 } else if (strcmp(key, "sun.java.command") == 0) { 991 _java_command = value; 992 993 // Record value in Arguments, but let it get passed to Java. 994 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 995 strcmp(key, "sun.java.launcher.pid") == 0) { 996 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 997 // private and are processed in process_sun_java_launcher_properties(); 998 // the sun.java.launcher property is passed on to the java application 999 FreeHeap(key); 1000 if (eq != NULL) { 1001 FreeHeap(value); 1002 } 1003 return true; 1004 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1005 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1006 // its value without going through the property list or making a Java call. 1007 _java_vendor_url_bug = value; 1008 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1009 PropertyList_unique_add(&_system_properties, key, value, true); 1010 return true; 1011 } 1012 // Create new property and add at the end of the list 1013 PropertyList_unique_add(&_system_properties, key, value); 1014 return true; 1015 } 1016 1017 //=========================================================================================================== 1018 // Setting int/mixed/comp mode flags 1019 1020 void Arguments::set_mode_flags(Mode mode) { 1021 // Set up default values for all flags. 1022 // If you add a flag to any of the branches below, 1023 // add a default value for it here. 1024 set_java_compiler(false); 1025 _mode = mode; 1026 1027 // Ensure Agent_OnLoad has the correct initial values. 1028 // This may not be the final mode; mode may change later in onload phase. 1029 PropertyList_unique_add(&_system_properties, "java.vm.info", 1030 (char*)VM_Version::vm_info_string(), false); 1031 1032 UseInterpreter = true; 1033 UseCompiler = true; 1034 UseLoopCounter = true; 1035 1036 // Default values may be platform/compiler dependent - 1037 // use the saved values 1038 ClipInlining = Arguments::_ClipInlining; 1039 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1040 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1041 BackgroundCompilation = Arguments::_BackgroundCompilation; 1042 if (TieredCompilation) { 1043 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1044 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1045 } 1046 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1047 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1048 } 1049 } 1050 1051 // Change from defaults based on mode 1052 switch (mode) { 1053 default: 1054 ShouldNotReachHere(); 1055 break; 1056 case _int: 1057 UseCompiler = false; 1058 UseLoopCounter = false; 1059 AlwaysCompileLoopMethods = false; 1060 UseOnStackReplacement = false; 1061 break; 1062 case _mixed: 1063 // same as default 1064 break; 1065 case _comp: 1066 UseInterpreter = false; 1067 BackgroundCompilation = false; 1068 ClipInlining = false; 1069 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1070 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1071 // compile a level 4 (C2) and then continue executing it. 1072 if (TieredCompilation) { 1073 Tier3InvokeNotifyFreqLog = 0; 1074 Tier4InvocationThreshold = 0; 1075 } 1076 break; 1077 } 1078 } 1079 1080 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1081 // Conflict: required to use shared spaces (-Xshare:on), but 1082 // incompatible command line options were chosen. 1083 1084 static void no_shared_spaces(const char* message) { 1085 if (RequireSharedSpaces) { 1086 jio_fprintf(defaultStream::error_stream(), 1087 "Class data sharing is inconsistent with other specified options.\n"); 1088 vm_exit_during_initialization("Unable to use shared archive.", message); 1089 } else { 1090 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1091 } 1092 } 1093 #endif 1094 1095 // Returns threshold scaled with the value of scale. 1096 // If scale < 0.0, threshold is returned without scaling. 1097 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1098 if (scale == 1.0 || scale < 0.0) { 1099 return threshold; 1100 } else { 1101 return (intx)(threshold * scale); 1102 } 1103 } 1104 1105 // Returns freq_log scaled with the value of scale. 1106 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1107 // If scale < 0.0, freq_log is returned without scaling. 1108 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1109 // Check if scaling is necessary or if negative value was specified. 1110 if (scale == 1.0 || scale < 0.0) { 1111 return freq_log; 1112 } 1113 // Check values to avoid calculating log2 of 0. 1114 if (scale == 0.0 || freq_log == 0) { 1115 return 0; 1116 } 1117 // Determine the maximum notification frequency value currently supported. 1118 // The largest mask value that the interpreter/C1 can handle is 1119 // of length InvocationCounter::number_of_count_bits. Mask values are always 1120 // one bit shorter then the value of the notification frequency. Set 1121 // max_freq_bits accordingly. 1122 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1123 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1124 if (scaled_freq == 0) { 1125 // Return 0 right away to avoid calculating log2 of 0. 1126 return 0; 1127 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1128 return max_freq_bits; 1129 } else { 1130 return log2_intptr(scaled_freq); 1131 } 1132 } 1133 1134 void Arguments::set_tiered_flags() { 1135 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1136 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1137 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1138 } 1139 if (CompilationPolicyChoice < 2) { 1140 vm_exit_during_initialization( 1141 "Incompatible compilation policy selected", NULL); 1142 } 1143 // Increase the code cache size - tiered compiles a lot more. 1144 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1145 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1146 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1147 } 1148 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1149 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1150 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1151 1152 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1153 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1154 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1155 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1156 } 1157 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1158 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1159 } 1160 // Check consistency of code heap sizes 1161 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1162 jio_fprintf(defaultStream::error_stream(), 1163 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1164 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1165 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1166 vm_exit(1); 1167 } 1168 } 1169 } 1170 if (!UseInterpreter) { // -Xcomp 1171 Tier3InvokeNotifyFreqLog = 0; 1172 Tier4InvocationThreshold = 0; 1173 } 1174 1175 if (CompileThresholdScaling < 0) { 1176 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1177 } 1178 1179 // Scale tiered compilation thresholds. 1180 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1181 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1182 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1183 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1184 1185 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1186 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1187 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1188 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1189 1190 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1191 // once these thresholds become supported. 1192 1193 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1194 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1195 1196 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1197 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1198 1199 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1200 1201 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1202 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1203 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1204 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1205 } 1206 } 1207 1208 /** 1209 * Returns the minimum number of compiler threads needed to run the JVM. The following 1210 * configurations are possible. 1211 * 1212 * 1) The JVM is build using an interpreter only. As a result, the minimum number of 1213 * compiler threads is 0. 1214 * 2) The JVM is build using the compiler(s) and tiered compilation is disabled. As 1215 * a result, either C1 or C2 is used, so the minimum number of compiler threads is 1. 1216 * 3) The JVM is build using the compiler(s) and tiered compilation is enabled. However, 1217 * the option "TieredStopAtLevel < CompLevel_full_optimization". As a result, only 1218 * C1 can be used, so the minimum number of compiler threads is 1. 1219 * 4) The JVM is build using the compilers and tiered compilation is enabled. The option 1220 * 'TieredStopAtLevel = CompLevel_full_optimization' (the default value). As a result, 1221 * the minimum number of compiler threads is 2. 1222 */ 1223 int Arguments::get_min_number_of_compiler_threads() { 1224 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1225 return 0; // case 1 1226 #else 1227 if (!TieredCompilation || (TieredStopAtLevel < CompLevel_full_optimization)) { 1228 return 1; // case 2 or case 3 1229 } 1230 return 2; // case 4 (tiered) 1231 #endif 1232 } 1233 1234 #if INCLUDE_ALL_GCS 1235 static void disable_adaptive_size_policy(const char* collector_name) { 1236 if (UseAdaptiveSizePolicy) { 1237 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1238 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1239 collector_name); 1240 } 1241 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1242 } 1243 } 1244 1245 void Arguments::set_parnew_gc_flags() { 1246 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1247 "control point invariant"); 1248 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1249 assert(UseParNewGC, "ParNew should always be used with CMS"); 1250 1251 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1252 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1253 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1254 } else if (ParallelGCThreads == 0) { 1255 jio_fprintf(defaultStream::error_stream(), 1256 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1257 vm_exit(1); 1258 } 1259 1260 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1261 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1262 // we set them to 1024 and 1024. 1263 // See CR 6362902. 1264 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1265 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1266 } 1267 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1268 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1269 } 1270 1271 // When using compressed oops, we use local overflow stacks, 1272 // rather than using a global overflow list chained through 1273 // the klass word of the object's pre-image. 1274 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1275 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1276 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1277 } 1278 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1279 } 1280 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1281 } 1282 1283 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1284 // sparc/solaris for certain applications, but would gain from 1285 // further optimization and tuning efforts, and would almost 1286 // certainly gain from analysis of platform and environment. 1287 void Arguments::set_cms_and_parnew_gc_flags() { 1288 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1289 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1290 assert(UseParNewGC, "ParNew should always be used with CMS"); 1291 1292 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1293 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1294 1295 set_parnew_gc_flags(); 1296 1297 size_t max_heap = align_size_down(MaxHeapSize, 1298 CardTableRS::ct_max_alignment_constraint()); 1299 1300 // Now make adjustments for CMS 1301 intx tenuring_default = (intx)6; 1302 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1303 1304 // Preferred young gen size for "short" pauses: 1305 // upper bound depends on # of threads and NewRatio. 1306 const size_t preferred_max_new_size_unaligned = 1307 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1308 size_t preferred_max_new_size = 1309 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1310 1311 // Unless explicitly requested otherwise, size young gen 1312 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1313 1314 // If either MaxNewSize or NewRatio is set on the command line, 1315 // assume the user is trying to set the size of the young gen. 1316 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1317 1318 // Set MaxNewSize to our calculated preferred_max_new_size unless 1319 // NewSize was set on the command line and it is larger than 1320 // preferred_max_new_size. 1321 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1322 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1323 } else { 1324 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1325 } 1326 if (PrintGCDetails && Verbose) { 1327 // Too early to use gclog_or_tty 1328 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1329 } 1330 1331 // Code along this path potentially sets NewSize and OldSize 1332 if (PrintGCDetails && Verbose) { 1333 // Too early to use gclog_or_tty 1334 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1335 " initial_heap_size: " SIZE_FORMAT 1336 " max_heap: " SIZE_FORMAT, 1337 min_heap_size(), InitialHeapSize, max_heap); 1338 } 1339 size_t min_new = preferred_max_new_size; 1340 if (FLAG_IS_CMDLINE(NewSize)) { 1341 min_new = NewSize; 1342 } 1343 if (max_heap > min_new && min_heap_size() > min_new) { 1344 // Unless explicitly requested otherwise, make young gen 1345 // at least min_new, and at most preferred_max_new_size. 1346 if (FLAG_IS_DEFAULT(NewSize)) { 1347 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1348 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1349 if (PrintGCDetails && Verbose) { 1350 // Too early to use gclog_or_tty 1351 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1352 } 1353 } 1354 // Unless explicitly requested otherwise, size old gen 1355 // so it's NewRatio x of NewSize. 1356 if (FLAG_IS_DEFAULT(OldSize)) { 1357 if (max_heap > NewSize) { 1358 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1359 if (PrintGCDetails && Verbose) { 1360 // Too early to use gclog_or_tty 1361 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1362 } 1363 } 1364 } 1365 } 1366 } 1367 // Unless explicitly requested otherwise, definitely 1368 // promote all objects surviving "tenuring_default" scavenges. 1369 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1370 FLAG_IS_DEFAULT(SurvivorRatio)) { 1371 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1372 } 1373 // If we decided above (or user explicitly requested) 1374 // `promote all' (via MaxTenuringThreshold := 0), 1375 // prefer minuscule survivor spaces so as not to waste 1376 // space for (non-existent) survivors 1377 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1378 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1379 } 1380 1381 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1382 // but rather the number of free blocks of a given size that are used when 1383 // replenishing the local per-worker free list caches. 1384 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1385 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1386 // OldPLAB sizing manually turned off: Use a larger default setting, 1387 // unless it was manually specified. This is because a too-low value 1388 // will slow down scavenges. 1389 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1390 } else { 1391 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1392 } 1393 } 1394 1395 // If either of the static initialization defaults have changed, note this 1396 // modification. 1397 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1398 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1399 } 1400 1401 if (!ClassUnloading) { 1402 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1403 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1404 } 1405 1406 if (PrintGCDetails && Verbose) { 1407 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1408 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1409 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1410 } 1411 } 1412 #endif // INCLUDE_ALL_GCS 1413 1414 void set_object_alignment() { 1415 // Object alignment. 1416 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1417 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1418 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1419 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1420 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1421 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1422 1423 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1424 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1425 1426 // Oop encoding heap max 1427 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1428 1429 if (SurvivorAlignmentInBytes == 0) { 1430 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1431 } 1432 1433 #if INCLUDE_ALL_GCS 1434 // Set CMS global values 1435 CompactibleFreeListSpace::set_cms_values(); 1436 #endif // INCLUDE_ALL_GCS 1437 } 1438 1439 size_t Arguments::max_heap_for_compressed_oops() { 1440 // Avoid sign flip. 1441 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1442 // We need to fit both the NULL page and the heap into the memory budget, while 1443 // keeping alignment constraints of the heap. To guarantee the latter, as the 1444 // NULL page is located before the heap, we pad the NULL page to the conservative 1445 // maximum alignment that the GC may ever impose upon the heap. 1446 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1447 _conservative_max_heap_alignment); 1448 1449 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1450 NOT_LP64(ShouldNotReachHere(); return 0); 1451 } 1452 1453 bool Arguments::should_auto_select_low_pause_collector() { 1454 if (UseAutoGCSelectPolicy && 1455 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1456 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1457 if (PrintGCDetails) { 1458 // Cannot use gclog_or_tty yet. 1459 tty->print_cr("Automatic selection of the low pause collector" 1460 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1461 } 1462 return true; 1463 } 1464 return false; 1465 } 1466 1467 void Arguments::set_use_compressed_oops() { 1468 #ifndef ZERO 1469 #ifdef _LP64 1470 // MaxHeapSize is not set up properly at this point, but 1471 // the only value that can override MaxHeapSize if we are 1472 // to use UseCompressedOops is InitialHeapSize. 1473 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1474 1475 if (max_heap_size <= max_heap_for_compressed_oops()) { 1476 #if !defined(COMPILER1) || defined(TIERED) 1477 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1478 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1479 } 1480 #endif 1481 } else { 1482 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1483 warning("Max heap size too large for Compressed Oops"); 1484 FLAG_SET_DEFAULT(UseCompressedOops, false); 1485 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1486 } 1487 } 1488 #endif // _LP64 1489 #endif // ZERO 1490 } 1491 1492 1493 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1494 // set_use_compressed_oops(). 1495 void Arguments::set_use_compressed_klass_ptrs() { 1496 #ifndef ZERO 1497 #ifdef _LP64 1498 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1499 if (!UseCompressedOops) { 1500 if (UseCompressedClassPointers) { 1501 warning("UseCompressedClassPointers requires UseCompressedOops"); 1502 } 1503 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1504 } else { 1505 // Turn on UseCompressedClassPointers too 1506 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1507 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1508 } 1509 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1510 if (UseCompressedClassPointers) { 1511 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1512 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1513 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1514 } 1515 } 1516 } 1517 #endif // _LP64 1518 #endif // !ZERO 1519 } 1520 1521 void Arguments::set_conservative_max_heap_alignment() { 1522 // The conservative maximum required alignment for the heap is the maximum of 1523 // the alignments imposed by several sources: any requirements from the heap 1524 // itself, the collector policy and the maximum page size we may run the VM 1525 // with. 1526 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1527 #if INCLUDE_ALL_GCS 1528 if (UseParallelGC) { 1529 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1530 } else if (UseG1GC) { 1531 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1532 } 1533 #endif // INCLUDE_ALL_GCS 1534 _conservative_max_heap_alignment = MAX4(heap_alignment, 1535 (size_t)os::vm_allocation_granularity(), 1536 os::max_page_size(), 1537 CollectorPolicy::compute_heap_alignment()); 1538 } 1539 1540 void Arguments::select_gc_ergonomically() { 1541 if (os::is_server_class_machine()) { 1542 if (should_auto_select_low_pause_collector()) { 1543 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1544 } else { 1545 #if defined(JAVASE_EMBEDDED) 1546 FLAG_SET_ERGO(bool, UseParallelGC, true); 1547 #else 1548 FLAG_SET_ERGO(bool, UseG1GC, true); 1549 #endif 1550 } 1551 } else { 1552 FLAG_SET_ERGO(bool, UseSerialGC, true); 1553 } 1554 } 1555 1556 void Arguments::select_gc() { 1557 if (!gc_selected()) { 1558 select_gc_ergonomically(); 1559 guarantee(gc_selected(), "No GC selected"); 1560 } 1561 } 1562 1563 void Arguments::set_ergonomics_flags() { 1564 select_gc(); 1565 1566 #ifdef COMPILER2 1567 // Shared spaces work fine with other GCs but causes bytecode rewriting 1568 // to be disabled, which hurts interpreter performance and decreases 1569 // server performance. When -server is specified, keep the default off 1570 // unless it is asked for. Future work: either add bytecode rewriting 1571 // at link time, or rewrite bytecodes in non-shared methods. 1572 if (!DumpSharedSpaces && !RequireSharedSpaces && 1573 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1574 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1575 } 1576 #endif 1577 1578 set_conservative_max_heap_alignment(); 1579 1580 #ifndef ZERO 1581 #ifdef _LP64 1582 set_use_compressed_oops(); 1583 1584 // set_use_compressed_klass_ptrs() must be called after calling 1585 // set_use_compressed_oops(). 1586 set_use_compressed_klass_ptrs(); 1587 1588 // Also checks that certain machines are slower with compressed oops 1589 // in vm_version initialization code. 1590 #endif // _LP64 1591 #endif // !ZERO 1592 1593 // Set up runtime image flags. 1594 set_runtime_image_flags(); 1595 1596 CodeCacheExtensions::set_ergonomics_flags(); 1597 } 1598 1599 void Arguments::set_parallel_gc_flags() { 1600 assert(UseParallelGC || UseParallelOldGC, "Error"); 1601 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1602 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1603 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1604 } 1605 FLAG_SET_DEFAULT(UseParallelGC, true); 1606 1607 // If no heap maximum was requested explicitly, use some reasonable fraction 1608 // of the physical memory, up to a maximum of 1GB. 1609 FLAG_SET_DEFAULT(ParallelGCThreads, 1610 Abstract_VM_Version::parallel_worker_threads()); 1611 if (ParallelGCThreads == 0) { 1612 jio_fprintf(defaultStream::error_stream(), 1613 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1614 vm_exit(1); 1615 } 1616 1617 if (UseAdaptiveSizePolicy) { 1618 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1619 // unless the user actually sets these flags. 1620 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1621 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1622 _min_heap_free_ratio = MinHeapFreeRatio; 1623 } 1624 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1625 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1626 _max_heap_free_ratio = MaxHeapFreeRatio; 1627 } 1628 } 1629 1630 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1631 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1632 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1633 // See CR 6362902 for details. 1634 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1635 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1636 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1637 } 1638 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1639 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1640 } 1641 } 1642 1643 if (UseParallelOldGC) { 1644 // Par compact uses lower default values since they are treated as 1645 // minimums. These are different defaults because of the different 1646 // interpretation and are not ergonomically set. 1647 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1648 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1649 } 1650 } 1651 } 1652 1653 void Arguments::set_g1_gc_flags() { 1654 assert(UseG1GC, "Error"); 1655 #ifdef COMPILER1 1656 FastTLABRefill = false; 1657 #endif 1658 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1659 if (ParallelGCThreads == 0) { 1660 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1661 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1662 } 1663 1664 #if INCLUDE_ALL_GCS 1665 if (G1ConcRefinementThreads == 0) { 1666 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1667 } 1668 #endif 1669 1670 // MarkStackSize will be set (if it hasn't been set by the user) 1671 // when concurrent marking is initialized. 1672 // Its value will be based upon the number of parallel marking threads. 1673 // But we do set the maximum mark stack size here. 1674 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1675 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1676 } 1677 1678 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1679 // In G1, we want the default GC overhead goal to be higher than 1680 // say in PS. So we set it here to 10%. Otherwise the heap might 1681 // be expanded more aggressively than we would like it to. In 1682 // fact, even 10% seems to not be high enough in some cases 1683 // (especially small GC stress tests that the main thing they do 1684 // is allocation). We might consider increase it further. 1685 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1686 } 1687 1688 if (PrintGCDetails && Verbose) { 1689 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1690 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1691 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1692 } 1693 } 1694 1695 #if !INCLUDE_ALL_GCS 1696 #ifdef ASSERT 1697 static bool verify_serial_gc_flags() { 1698 return (UseSerialGC && 1699 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1700 UseParallelGC || UseParallelOldGC)); 1701 } 1702 #endif // ASSERT 1703 #endif // INCLUDE_ALL_GCS 1704 1705 void Arguments::set_gc_specific_flags() { 1706 #if INCLUDE_ALL_GCS 1707 // Set per-collector flags 1708 if (UseParallelGC || UseParallelOldGC) { 1709 set_parallel_gc_flags(); 1710 } else if (UseConcMarkSweepGC) { 1711 set_cms_and_parnew_gc_flags(); 1712 } else if (UseG1GC) { 1713 set_g1_gc_flags(); 1714 } 1715 check_deprecated_gc_flags(); 1716 if (AssumeMP && !UseSerialGC) { 1717 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1718 warning("If the number of processors is expected to increase from one, then" 1719 " you should configure the number of parallel GC threads appropriately" 1720 " using -XX:ParallelGCThreads=N"); 1721 } 1722 } 1723 if (MinHeapFreeRatio == 100) { 1724 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1725 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1726 } 1727 #else // INCLUDE_ALL_GCS 1728 assert(verify_serial_gc_flags(), "SerialGC unset"); 1729 #endif // INCLUDE_ALL_GCS 1730 } 1731 1732 julong Arguments::limit_by_allocatable_memory(julong limit) { 1733 julong max_allocatable; 1734 julong result = limit; 1735 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1736 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1737 } 1738 return result; 1739 } 1740 1741 // Use static initialization to get the default before parsing 1742 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1743 1744 void Arguments::set_heap_size() { 1745 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1746 // Deprecated flag 1747 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1748 } 1749 1750 const julong phys_mem = 1751 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1752 : (julong)MaxRAM; 1753 1754 // If the maximum heap size has not been set with -Xmx, 1755 // then set it as fraction of the size of physical memory, 1756 // respecting the maximum and minimum sizes of the heap. 1757 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1758 julong reasonable_max = phys_mem / MaxRAMFraction; 1759 1760 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1761 // Small physical memory, so use a minimum fraction of it for the heap 1762 reasonable_max = phys_mem / MinRAMFraction; 1763 } else { 1764 // Not-small physical memory, so require a heap at least 1765 // as large as MaxHeapSize 1766 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1767 } 1768 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1769 // Limit the heap size to ErgoHeapSizeLimit 1770 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1771 } 1772 if (UseCompressedOops) { 1773 // Limit the heap size to the maximum possible when using compressed oops 1774 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1775 1776 // HeapBaseMinAddress can be greater than default but not less than. 1777 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1778 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1779 // matches compressed oops printing flags 1780 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1781 jio_fprintf(defaultStream::error_stream(), 1782 "HeapBaseMinAddress must be at least " SIZE_FORMAT 1783 " (" SIZE_FORMAT "G) which is greater than value given " 1784 SIZE_FORMAT "\n", 1785 DefaultHeapBaseMinAddress, 1786 DefaultHeapBaseMinAddress/G, 1787 HeapBaseMinAddress); 1788 } 1789 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1790 } 1791 } 1792 1793 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1794 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1795 // but it should be not less than default MaxHeapSize. 1796 max_coop_heap -= HeapBaseMinAddress; 1797 } 1798 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1799 } 1800 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1801 1802 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1803 // An initial heap size was specified on the command line, 1804 // so be sure that the maximum size is consistent. Done 1805 // after call to limit_by_allocatable_memory because that 1806 // method might reduce the allocation size. 1807 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1808 } 1809 1810 if (PrintGCDetails && Verbose) { 1811 // Cannot use gclog_or_tty yet. 1812 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1813 } 1814 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1815 } 1816 1817 // If the minimum or initial heap_size have not been set or requested to be set 1818 // ergonomically, set them accordingly. 1819 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1820 julong reasonable_minimum = (julong)(OldSize + NewSize); 1821 1822 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1823 1824 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1825 1826 if (InitialHeapSize == 0) { 1827 julong reasonable_initial = phys_mem / InitialRAMFraction; 1828 1829 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1830 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1831 1832 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1833 1834 if (PrintGCDetails && Verbose) { 1835 // Cannot use gclog_or_tty yet. 1836 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1837 } 1838 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1839 } 1840 // If the minimum heap size has not been set (via -Xms), 1841 // synchronize with InitialHeapSize to avoid errors with the default value. 1842 if (min_heap_size() == 0) { 1843 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1844 if (PrintGCDetails && Verbose) { 1845 // Cannot use gclog_or_tty yet. 1846 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1847 } 1848 } 1849 } 1850 } 1851 1852 // Set up runtime image flags 1853 void Arguments::set_runtime_image_flags() { 1854 #ifdef _LP64 1855 // Memory map image file by default on 64 bit machines. 1856 if (FLAG_IS_DEFAULT(MemoryMapImage)) { 1857 FLAG_SET_ERGO(bool, MemoryMapImage, true); 1858 } 1859 #endif 1860 } 1861 1862 // This must be called after ergonomics. 1863 void Arguments::set_bytecode_flags() { 1864 if (!RewriteBytecodes) { 1865 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1866 } 1867 } 1868 1869 // Aggressive optimization flags -XX:+AggressiveOpts 1870 void Arguments::set_aggressive_opts_flags() { 1871 #ifdef COMPILER2 1872 if (AggressiveUnboxing) { 1873 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1874 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1875 } else if (!EliminateAutoBox) { 1876 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1877 AggressiveUnboxing = false; 1878 } 1879 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1880 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1881 } else if (!DoEscapeAnalysis) { 1882 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1883 AggressiveUnboxing = false; 1884 } 1885 } 1886 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1887 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1888 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1889 } 1890 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1891 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1892 } 1893 1894 // Feed the cache size setting into the JDK 1895 char buffer[1024]; 1896 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1897 add_property(buffer); 1898 } 1899 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1900 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1901 } 1902 #endif 1903 1904 if (AggressiveOpts) { 1905 // Sample flag setting code 1906 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1907 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1908 // } 1909 } 1910 } 1911 1912 //=========================================================================================================== 1913 // Parsing of java.compiler property 1914 1915 void Arguments::process_java_compiler_argument(char* arg) { 1916 // For backwards compatibility, Djava.compiler=NONE or "" 1917 // causes us to switch to -Xint mode UNLESS -Xdebug 1918 // is also specified. 1919 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1920 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1921 } 1922 } 1923 1924 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1925 _sun_java_launcher = os::strdup_check_oom(launcher); 1926 } 1927 1928 bool Arguments::created_by_java_launcher() { 1929 assert(_sun_java_launcher != NULL, "property must have value"); 1930 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1931 } 1932 1933 bool Arguments::sun_java_launcher_is_altjvm() { 1934 return _sun_java_launcher_is_altjvm; 1935 } 1936 1937 //=========================================================================================================== 1938 // Parsing of main arguments 1939 1940 // check if do gclog rotation 1941 // +UseGCLogFileRotation is a must, 1942 // no gc log rotation when log file not supplied or 1943 // NumberOfGCLogFiles is 0 1944 void check_gclog_consistency() { 1945 if (UseGCLogFileRotation) { 1946 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1947 jio_fprintf(defaultStream::output_stream(), 1948 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1949 "where num_of_file > 0\n" 1950 "GC log rotation is turned off\n"); 1951 UseGCLogFileRotation = false; 1952 } 1953 } 1954 1955 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1956 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) { 1957 jio_fprintf(defaultStream::output_stream(), 1958 "GCLogFileSize changed to minimum 8K\n"); 1959 } 1960 } 1961 } 1962 1963 // This function is called for -Xloggc:<filename>, it can be used 1964 // to check if a given file name(or string) conforms to the following 1965 // specification: 1966 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1967 // %p and %t only allowed once. We only limit usage of filename not path 1968 bool is_filename_valid(const char *file_name) { 1969 const char* p = file_name; 1970 char file_sep = os::file_separator()[0]; 1971 const char* cp; 1972 // skip prefix path 1973 for (cp = file_name; *cp != '\0'; cp++) { 1974 if (*cp == '/' || *cp == file_sep) { 1975 p = cp + 1; 1976 } 1977 } 1978 1979 int count_p = 0; 1980 int count_t = 0; 1981 while (*p != '\0') { 1982 if ((*p >= '0' && *p <= '9') || 1983 (*p >= 'A' && *p <= 'Z') || 1984 (*p >= 'a' && *p <= 'z') || 1985 *p == '-' || 1986 *p == '_' || 1987 *p == '.') { 1988 p++; 1989 continue; 1990 } 1991 if (*p == '%') { 1992 if(*(p + 1) == 'p') { 1993 p += 2; 1994 count_p ++; 1995 continue; 1996 } 1997 if (*(p + 1) == 't') { 1998 p += 2; 1999 count_t ++; 2000 continue; 2001 } 2002 } 2003 return false; 2004 } 2005 return count_p < 2 && count_t < 2; 2006 } 2007 2008 // Check consistency of GC selection 2009 bool Arguments::check_gc_consistency() { 2010 check_gclog_consistency(); 2011 // Ensure that the user has not selected conflicting sets 2012 // of collectors. 2013 uint i = 0; 2014 if (UseSerialGC) i++; 2015 if (UseConcMarkSweepGC) i++; 2016 if (UseParallelGC || UseParallelOldGC) i++; 2017 if (UseG1GC) i++; 2018 if (i > 1) { 2019 jio_fprintf(defaultStream::error_stream(), 2020 "Conflicting collector combinations in option list; " 2021 "please refer to the release notes for the combinations " 2022 "allowed\n"); 2023 return false; 2024 } 2025 2026 if (UseConcMarkSweepGC && !UseParNewGC) { 2027 jio_fprintf(defaultStream::error_stream(), 2028 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2029 return false; 2030 } 2031 2032 if (UseParNewGC && !UseConcMarkSweepGC) { 2033 jio_fprintf(defaultStream::error_stream(), 2034 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2035 return false; 2036 } 2037 2038 return true; 2039 } 2040 2041 void Arguments::check_deprecated_gc_flags() { 2042 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2043 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2044 } 2045 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2046 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2047 "and will likely be removed in future release"); 2048 } 2049 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2050 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2051 "Use MaxRAMFraction instead."); 2052 } 2053 } 2054 2055 // Check the consistency of vm_init_args 2056 bool Arguments::check_vm_args_consistency() { 2057 // Method for adding checks for flag consistency. 2058 // The intent is to warn the user of all possible conflicts, 2059 // before returning an error. 2060 // Note: Needs platform-dependent factoring. 2061 bool status = true; 2062 2063 if (TLABRefillWasteFraction == 0) { 2064 jio_fprintf(defaultStream::error_stream(), 2065 "TLABRefillWasteFraction should be a denominator, " 2066 "not " SIZE_FORMAT "\n", 2067 TLABRefillWasteFraction); 2068 status = false; 2069 } 2070 2071 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2072 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2073 } 2074 2075 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2076 // Settings to encourage splitting. 2077 if (!FLAG_IS_CMDLINE(NewRatio)) { 2078 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) { 2079 status = false; 2080 } 2081 } 2082 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2083 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2084 status = false; 2085 } 2086 } 2087 } 2088 2089 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2090 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2091 } 2092 2093 if (GCTimeLimit == 100) { 2094 // Turn off gc-overhead-limit-exceeded checks 2095 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2096 } 2097 2098 status = status && check_gc_consistency(); 2099 2100 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2101 // insists that we hold the requisite locks so that the iteration is 2102 // MT-safe. For the verification at start-up and shut-down, we don't 2103 // yet have a good way of acquiring and releasing these locks, 2104 // which are not visible at the CollectedHeap level. We want to 2105 // be able to acquire these locks and then do the iteration rather 2106 // than just disable the lock verification. This will be fixed under 2107 // bug 4788986. 2108 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2109 if (VerifyDuringStartup) { 2110 warning("Heap verification at start-up disabled " 2111 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2112 VerifyDuringStartup = false; // Disable verification at start-up 2113 } 2114 2115 if (VerifyBeforeExit) { 2116 warning("Heap verification at shutdown disabled " 2117 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2118 VerifyBeforeExit = false; // Disable verification at shutdown 2119 } 2120 } 2121 2122 // Note: only executed in non-PRODUCT mode 2123 if (!UseAsyncConcMarkSweepGC && 2124 (ExplicitGCInvokesConcurrent || 2125 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2126 jio_fprintf(defaultStream::error_stream(), 2127 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2128 " with -UseAsyncConcMarkSweepGC"); 2129 status = false; 2130 } 2131 2132 if (PrintNMTStatistics) { 2133 #if INCLUDE_NMT 2134 if (MemTracker::tracking_level() == NMT_off) { 2135 #endif // INCLUDE_NMT 2136 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2137 PrintNMTStatistics = false; 2138 #if INCLUDE_NMT 2139 } 2140 #endif 2141 } 2142 2143 // Check lower bounds of the code cache 2144 // Template Interpreter code is approximately 3X larger in debug builds. 2145 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2146 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2147 jio_fprintf(defaultStream::error_stream(), 2148 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2149 os::vm_page_size()/K); 2150 status = false; 2151 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2152 jio_fprintf(defaultStream::error_stream(), 2153 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2154 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2155 status = false; 2156 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2157 jio_fprintf(defaultStream::error_stream(), 2158 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2159 min_code_cache_size/K); 2160 status = false; 2161 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2162 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2163 jio_fprintf(defaultStream::error_stream(), 2164 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2165 CODE_CACHE_SIZE_LIMIT/M); 2166 status = false; 2167 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2168 jio_fprintf(defaultStream::error_stream(), 2169 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2170 min_code_cache_size/K); 2171 status = false; 2172 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2173 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2174 jio_fprintf(defaultStream::error_stream(), 2175 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2176 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2177 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2178 status = false; 2179 } 2180 2181 int min_number_of_compiler_threads = get_min_number_of_compiler_threads(); 2182 // The default CICompilerCount's value is CI_COMPILER_COUNT. 2183 assert(min_number_of_compiler_threads <= CI_COMPILER_COUNT, "minimum should be less or equal default number"); 2184 2185 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2186 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2187 } 2188 2189 return status; 2190 } 2191 2192 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2193 const char* option_type) { 2194 if (ignore) return false; 2195 2196 const char* spacer = " "; 2197 if (option_type == NULL) { 2198 option_type = ++spacer; // Set both to the empty string. 2199 } 2200 2201 if (os::obsolete_option(option)) { 2202 jio_fprintf(defaultStream::error_stream(), 2203 "Obsolete %s%soption: %s\n", option_type, spacer, 2204 option->optionString); 2205 return false; 2206 } else { 2207 jio_fprintf(defaultStream::error_stream(), 2208 "Unrecognized %s%soption: %s\n", option_type, spacer, 2209 option->optionString); 2210 return true; 2211 } 2212 } 2213 2214 static const char* user_assertion_options[] = { 2215 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2216 }; 2217 2218 static const char* system_assertion_options[] = { 2219 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2220 }; 2221 2222 bool Arguments::parse_uintx(const char* value, 2223 uintx* uintx_arg, 2224 uintx min_size) { 2225 2226 // Check the sign first since atomull() parses only unsigned values. 2227 bool value_is_positive = !(*value == '-'); 2228 2229 if (value_is_positive) { 2230 julong n; 2231 bool good_return = atomull(value, &n); 2232 if (good_return) { 2233 bool above_minimum = n >= min_size; 2234 bool value_is_too_large = n > max_uintx; 2235 2236 if (above_minimum && !value_is_too_large) { 2237 *uintx_arg = n; 2238 return true; 2239 } 2240 } 2241 } 2242 return false; 2243 } 2244 2245 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2246 julong* long_arg, 2247 julong min_size) { 2248 if (!atomull(s, long_arg)) return arg_unreadable; 2249 return check_memory_size(*long_arg, min_size); 2250 } 2251 2252 // Parse JavaVMInitArgs structure 2253 2254 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2255 const JavaVMInitArgs *java_options_args, 2256 const JavaVMInitArgs *cmd_line_args) { 2257 // For components of the system classpath. 2258 SysClassPath scp(Arguments::get_sysclasspath()); 2259 bool scp_assembly_required = false; 2260 2261 // Save default settings for some mode flags 2262 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2263 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2264 Arguments::_ClipInlining = ClipInlining; 2265 Arguments::_BackgroundCompilation = BackgroundCompilation; 2266 if (TieredCompilation) { 2267 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2268 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2269 } 2270 2271 // Setup flags for mixed which is the default 2272 set_mode_flags(_mixed); 2273 2274 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2275 // variable (if present). 2276 jint result = parse_each_vm_init_arg( 2277 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2278 if (result != JNI_OK) { 2279 return result; 2280 } 2281 2282 // Parse args structure generated from the command line flags. 2283 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required, 2284 Flag::COMMAND_LINE); 2285 if (result != JNI_OK) { 2286 return result; 2287 } 2288 2289 // Parse args structure generated from the _JAVA_OPTIONS environment 2290 // variable (if present) (mimics classic VM) 2291 result = parse_each_vm_init_arg( 2292 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2293 if (result != JNI_OK) { 2294 return result; 2295 } 2296 2297 // Do final processing now that all arguments have been parsed 2298 result = finalize_vm_init_args(&scp, scp_assembly_required); 2299 if (result != JNI_OK) { 2300 return result; 2301 } 2302 2303 return JNI_OK; 2304 } 2305 2306 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2307 // represents a valid HPROF of JDWP agent. is_path==true denotes that we 2308 // are dealing with -agentpath (case where name is a path), otherwise with 2309 // -agentlib 2310 bool valid_hprof_or_jdwp_agent(char *name, bool is_path) { 2311 char *_name; 2312 const char *_hprof = "hprof", *_jdwp = "jdwp"; 2313 size_t _len_hprof, _len_jdwp, _len_prefix; 2314 2315 if (is_path) { 2316 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2317 return false; 2318 } 2319 2320 _name++; // skip past last path separator 2321 _len_prefix = strlen(JNI_LIB_PREFIX); 2322 2323 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2324 return false; 2325 } 2326 2327 _name += _len_prefix; 2328 _len_hprof = strlen(_hprof); 2329 _len_jdwp = strlen(_jdwp); 2330 2331 if (strncmp(_name, _hprof, _len_hprof) == 0) { 2332 _name += _len_hprof; 2333 } 2334 else if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2335 _name += _len_jdwp; 2336 } 2337 else { 2338 return false; 2339 } 2340 2341 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2342 return false; 2343 } 2344 2345 return true; 2346 } 2347 2348 if (strcmp(name, _hprof) == 0 || strcmp(name, _jdwp) == 0) { 2349 return true; 2350 } 2351 2352 return false; 2353 } 2354 2355 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2356 SysClassPath* scp_p, 2357 bool* scp_assembly_required_p, 2358 Flag::Flags origin) { 2359 // Remaining part of option string 2360 const char* tail; 2361 2362 // iterate over arguments 2363 for (int index = 0; index < args->nOptions; index++) { 2364 bool is_absolute_path = false; // for -agentpath vs -agentlib 2365 2366 const JavaVMOption* option = args->options + index; 2367 2368 if (!match_option(option, "-Djava.class.path", &tail) && 2369 !match_option(option, "-Dsun.java.command", &tail) && 2370 !match_option(option, "-Dsun.java.launcher", &tail)) { 2371 2372 // add all jvm options to the jvm_args string. This string 2373 // is used later to set the java.vm.args PerfData string constant. 2374 // the -Djava.class.path and the -Dsun.java.command options are 2375 // omitted from jvm_args string as each have their own PerfData 2376 // string constant object. 2377 build_jvm_args(option->optionString); 2378 } 2379 2380 // -verbose:[class/gc/jni] 2381 if (match_option(option, "-verbose", &tail)) { 2382 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2383 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) { 2384 return JNI_EINVAL; 2385 } 2386 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) { 2387 return JNI_EINVAL; 2388 } 2389 } else if (!strcmp(tail, ":gc")) { 2390 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 2391 return JNI_EINVAL; 2392 } 2393 } else if (!strcmp(tail, ":jni")) { 2394 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2395 return JNI_EINVAL; 2396 } 2397 } 2398 // -da / -ea / -disableassertions / -enableassertions 2399 // These accept an optional class/package name separated by a colon, e.g., 2400 // -da:java.lang.Thread. 2401 } else if (match_option(option, user_assertion_options, &tail, true)) { 2402 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2403 if (*tail == '\0') { 2404 JavaAssertions::setUserClassDefault(enable); 2405 } else { 2406 assert(*tail == ':', "bogus match by match_option()"); 2407 JavaAssertions::addOption(tail + 1, enable); 2408 } 2409 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2410 } else if (match_option(option, system_assertion_options, &tail, false)) { 2411 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2412 JavaAssertions::setSystemClassDefault(enable); 2413 // -bootclasspath: 2414 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2415 scp_p->reset_path(tail); 2416 *scp_assembly_required_p = true; 2417 // -bootclasspath/a: 2418 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2419 scp_p->add_suffix(tail); 2420 *scp_assembly_required_p = true; 2421 // -bootclasspath/p: 2422 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2423 scp_p->add_prefix(tail); 2424 *scp_assembly_required_p = true; 2425 // -Xrun 2426 } else if (match_option(option, "-Xrun", &tail)) { 2427 if (tail != NULL) { 2428 const char* pos = strchr(tail, ':'); 2429 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2430 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2431 name[len] = '\0'; 2432 2433 char *options = NULL; 2434 if(pos != NULL) { 2435 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2436 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2437 } 2438 #if !INCLUDE_JVMTI 2439 if ((strcmp(name, "hprof") == 0) || (strcmp(name, "jdwp") == 0)) { 2440 jio_fprintf(defaultStream::error_stream(), 2441 "Profiling and debugging agents are not supported in this VM\n"); 2442 return JNI_ERR; 2443 } 2444 #endif // !INCLUDE_JVMTI 2445 add_init_library(name, options); 2446 } 2447 // -agentlib and -agentpath 2448 } else if (match_option(option, "-agentlib:", &tail) || 2449 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2450 if(tail != NULL) { 2451 const char* pos = strchr(tail, '='); 2452 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2453 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2454 name[len] = '\0'; 2455 2456 char *options = NULL; 2457 if(pos != NULL) { 2458 options = os::strdup_check_oom(pos + 1, mtInternal); 2459 } 2460 #if !INCLUDE_JVMTI 2461 if (valid_hprof_or_jdwp_agent(name, is_absolute_path)) { 2462 jio_fprintf(defaultStream::error_stream(), 2463 "Profiling and debugging agents are not supported in this VM\n"); 2464 return JNI_ERR; 2465 } 2466 #endif // !INCLUDE_JVMTI 2467 add_init_agent(name, options, is_absolute_path); 2468 } 2469 // -javaagent 2470 } else if (match_option(option, "-javaagent:", &tail)) { 2471 #if !INCLUDE_JVMTI 2472 jio_fprintf(defaultStream::error_stream(), 2473 "Instrumentation agents are not supported in this VM\n"); 2474 return JNI_ERR; 2475 #else 2476 if(tail != NULL) { 2477 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2478 add_init_agent("instrument", options, false); 2479 } 2480 #endif // !INCLUDE_JVMTI 2481 // -Xnoclassgc 2482 } else if (match_option(option, "-Xnoclassgc")) { 2483 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2484 return JNI_EINVAL; 2485 } 2486 // -Xconcgc 2487 } else if (match_option(option, "-Xconcgc")) { 2488 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2489 return JNI_EINVAL; 2490 } 2491 // -Xnoconcgc 2492 } else if (match_option(option, "-Xnoconcgc")) { 2493 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2494 return JNI_EINVAL; 2495 } 2496 // -Xbatch 2497 } else if (match_option(option, "-Xbatch")) { 2498 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2499 return JNI_EINVAL; 2500 } 2501 // -Xmn for compatibility with other JVM vendors 2502 } else if (match_option(option, "-Xmn", &tail)) { 2503 julong long_initial_young_size = 0; 2504 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2505 if (errcode != arg_in_range) { 2506 jio_fprintf(defaultStream::error_stream(), 2507 "Invalid initial young generation size: %s\n", option->optionString); 2508 describe_range_error(errcode); 2509 return JNI_EINVAL; 2510 } 2511 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2512 return JNI_EINVAL; 2513 } 2514 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2515 return JNI_EINVAL; 2516 } 2517 // -Xms 2518 } else if (match_option(option, "-Xms", &tail)) { 2519 julong long_initial_heap_size = 0; 2520 // an initial heap size of 0 means automatically determine 2521 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2522 if (errcode != arg_in_range) { 2523 jio_fprintf(defaultStream::error_stream(), 2524 "Invalid initial heap size: %s\n", option->optionString); 2525 describe_range_error(errcode); 2526 return JNI_EINVAL; 2527 } 2528 set_min_heap_size((size_t)long_initial_heap_size); 2529 // Currently the minimum size and the initial heap sizes are the same. 2530 // Can be overridden with -XX:InitialHeapSize. 2531 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2532 return JNI_EINVAL; 2533 } 2534 // -Xmx 2535 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2536 julong long_max_heap_size = 0; 2537 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2538 if (errcode != arg_in_range) { 2539 jio_fprintf(defaultStream::error_stream(), 2540 "Invalid maximum heap size: %s\n", option->optionString); 2541 describe_range_error(errcode); 2542 return JNI_EINVAL; 2543 } 2544 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2545 return JNI_EINVAL; 2546 } 2547 // Xmaxf 2548 } else if (match_option(option, "-Xmaxf", &tail)) { 2549 char* err; 2550 int maxf = (int)(strtod(tail, &err) * 100); 2551 if (*err != '\0' || *tail == '\0') { 2552 jio_fprintf(defaultStream::error_stream(), 2553 "Bad max heap free percentage size: %s\n", 2554 option->optionString); 2555 return JNI_EINVAL; 2556 } else { 2557 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2558 return JNI_EINVAL; 2559 } 2560 } 2561 // Xminf 2562 } else if (match_option(option, "-Xminf", &tail)) { 2563 char* err; 2564 int minf = (int)(strtod(tail, &err) * 100); 2565 if (*err != '\0' || *tail == '\0') { 2566 jio_fprintf(defaultStream::error_stream(), 2567 "Bad min heap free percentage size: %s\n", 2568 option->optionString); 2569 return JNI_EINVAL; 2570 } else { 2571 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2572 return JNI_EINVAL; 2573 } 2574 } 2575 // -Xss 2576 } else if (match_option(option, "-Xss", &tail)) { 2577 julong long_ThreadStackSize = 0; 2578 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2579 if (errcode != arg_in_range) { 2580 jio_fprintf(defaultStream::error_stream(), 2581 "Invalid thread stack size: %s\n", option->optionString); 2582 describe_range_error(errcode); 2583 return JNI_EINVAL; 2584 } 2585 // Internally track ThreadStackSize in units of 1024 bytes. 2586 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2587 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2588 return JNI_EINVAL; 2589 } 2590 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads 2591 } else if (match_option(option, "-Xoss", &tail) || 2592 match_option(option, "-Xsqnopause") || 2593 match_option(option, "-Xoptimize") || 2594 match_option(option, "-Xboundthreads")) { 2595 // All these options are deprecated in JDK 9 and will be removed in a future release 2596 char version[256]; 2597 JDK_Version::jdk(9).to_string(version, sizeof(version)); 2598 warning("ignoring option %s; support was removed in %s", option->optionString, version); 2599 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2600 julong long_CodeCacheExpansionSize = 0; 2601 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2602 if (errcode != arg_in_range) { 2603 jio_fprintf(defaultStream::error_stream(), 2604 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2605 os::vm_page_size()/K); 2606 return JNI_EINVAL; 2607 } 2608 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 2609 return JNI_EINVAL; 2610 } 2611 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2612 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2613 julong long_ReservedCodeCacheSize = 0; 2614 2615 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2616 if (errcode != arg_in_range) { 2617 jio_fprintf(defaultStream::error_stream(), 2618 "Invalid maximum code cache size: %s.\n", option->optionString); 2619 return JNI_EINVAL; 2620 } 2621 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 2622 return JNI_EINVAL; 2623 } 2624 // -XX:NonNMethodCodeHeapSize= 2625 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2626 julong long_NonNMethodCodeHeapSize = 0; 2627 2628 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2629 if (errcode != arg_in_range) { 2630 jio_fprintf(defaultStream::error_stream(), 2631 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2632 return JNI_EINVAL; 2633 } 2634 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 2635 return JNI_EINVAL; 2636 } 2637 // -XX:ProfiledCodeHeapSize= 2638 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2639 julong long_ProfiledCodeHeapSize = 0; 2640 2641 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2642 if (errcode != arg_in_range) { 2643 jio_fprintf(defaultStream::error_stream(), 2644 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2645 return JNI_EINVAL; 2646 } 2647 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 2648 return JNI_EINVAL; 2649 } 2650 // -XX:NonProfiledCodeHeapSizee= 2651 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2652 julong long_NonProfiledCodeHeapSize = 0; 2653 2654 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2655 if (errcode != arg_in_range) { 2656 jio_fprintf(defaultStream::error_stream(), 2657 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2658 return JNI_EINVAL; 2659 } 2660 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 2661 return JNI_EINVAL; 2662 } 2663 // -green 2664 } else if (match_option(option, "-green")) { 2665 jio_fprintf(defaultStream::error_stream(), 2666 "Green threads support not available\n"); 2667 return JNI_EINVAL; 2668 // -native 2669 } else if (match_option(option, "-native")) { 2670 // HotSpot always uses native threads, ignore silently for compatibility 2671 // -Xrs 2672 } else if (match_option(option, "-Xrs")) { 2673 // Classic/EVM option, new functionality 2674 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 2675 return JNI_EINVAL; 2676 } 2677 } else if (match_option(option, "-Xusealtsigs")) { 2678 // change default internal VM signals used - lower case for back compat 2679 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) { 2680 return JNI_EINVAL; 2681 } 2682 // -Xprof 2683 } else if (match_option(option, "-Xprof")) { 2684 #if INCLUDE_FPROF 2685 _has_profile = true; 2686 #else // INCLUDE_FPROF 2687 jio_fprintf(defaultStream::error_stream(), 2688 "Flat profiling is not supported in this VM.\n"); 2689 return JNI_ERR; 2690 #endif // INCLUDE_FPROF 2691 // -Xconcurrentio 2692 } else if (match_option(option, "-Xconcurrentio")) { 2693 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 2694 return JNI_EINVAL; 2695 } 2696 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2697 return JNI_EINVAL; 2698 } 2699 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 2700 return JNI_EINVAL; 2701 } 2702 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 2703 return JNI_EINVAL; 2704 } 2705 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 2706 return JNI_EINVAL; 2707 } 2708 2709 // -Xinternalversion 2710 } else if (match_option(option, "-Xinternalversion")) { 2711 jio_fprintf(defaultStream::output_stream(), "%s\n", 2712 VM_Version::internal_vm_info_string()); 2713 vm_exit(0); 2714 #ifndef PRODUCT 2715 // -Xprintflags 2716 } else if (match_option(option, "-Xprintflags")) { 2717 CommandLineFlags::printFlags(tty, false); 2718 vm_exit(0); 2719 #endif 2720 // -D 2721 } else if (match_option(option, "-D", &tail)) { 2722 const char* value; 2723 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2724 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2725 // abort if -Djava.endorsed.dirs is set 2726 jio_fprintf(defaultStream::output_stream(), 2727 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2728 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2729 return JNI_EINVAL; 2730 } 2731 if (match_option(option, "-Djava.ext.dirs=", &value) && 2732 *value != '\0' && strcmp(value, "\"\"") != 0) { 2733 // abort if -Djava.ext.dirs is set 2734 jio_fprintf(defaultStream::output_stream(), 2735 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2736 return JNI_EINVAL; 2737 } 2738 2739 if (!add_property(tail)) { 2740 return JNI_ENOMEM; 2741 } 2742 // Out of the box management support 2743 if (match_option(option, "-Dcom.sun.management", &tail)) { 2744 #if INCLUDE_MANAGEMENT 2745 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 2746 return JNI_EINVAL; 2747 } 2748 #else 2749 jio_fprintf(defaultStream::output_stream(), 2750 "-Dcom.sun.management is not supported in this VM.\n"); 2751 return JNI_ERR; 2752 #endif 2753 } 2754 // -Xint 2755 } else if (match_option(option, "-Xint")) { 2756 set_mode_flags(_int); 2757 // -Xmixed 2758 } else if (match_option(option, "-Xmixed")) { 2759 set_mode_flags(_mixed); 2760 // -Xcomp 2761 } else if (match_option(option, "-Xcomp")) { 2762 // for testing the compiler; turn off all flags that inhibit compilation 2763 set_mode_flags(_comp); 2764 // -Xshare:dump 2765 } else if (match_option(option, "-Xshare:dump")) { 2766 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 2767 return JNI_EINVAL; 2768 } 2769 set_mode_flags(_int); // Prevent compilation, which creates objects 2770 // -Xshare:on 2771 } else if (match_option(option, "-Xshare:on")) { 2772 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 2773 return JNI_EINVAL; 2774 } 2775 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 2776 return JNI_EINVAL; 2777 } 2778 // -Xshare:auto 2779 } else if (match_option(option, "-Xshare:auto")) { 2780 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 2781 return JNI_EINVAL; 2782 } 2783 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 2784 return JNI_EINVAL; 2785 } 2786 // -Xshare:off 2787 } else if (match_option(option, "-Xshare:off")) { 2788 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 2789 return JNI_EINVAL; 2790 } 2791 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 2792 return JNI_EINVAL; 2793 } 2794 // -Xverify 2795 } else if (match_option(option, "-Xverify", &tail)) { 2796 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2797 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 2798 return JNI_EINVAL; 2799 } 2800 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 2801 return JNI_EINVAL; 2802 } 2803 } else if (strcmp(tail, ":remote") == 0) { 2804 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 2805 return JNI_EINVAL; 2806 } 2807 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 2808 return JNI_EINVAL; 2809 } 2810 } else if (strcmp(tail, ":none") == 0) { 2811 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 2812 return JNI_EINVAL; 2813 } 2814 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 2815 return JNI_EINVAL; 2816 } 2817 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2818 return JNI_EINVAL; 2819 } 2820 // -Xdebug 2821 } else if (match_option(option, "-Xdebug")) { 2822 // note this flag has been used, then ignore 2823 set_xdebug_mode(true); 2824 // -Xnoagent 2825 } else if (match_option(option, "-Xnoagent")) { 2826 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2827 } else if (match_option(option, "-Xloggc:", &tail)) { 2828 // Redirect GC output to the file. -Xloggc:<filename> 2829 // ostream_init_log(), when called will use this filename 2830 // to initialize a fileStream. 2831 _gc_log_filename = os::strdup_check_oom(tail); 2832 if (!is_filename_valid(_gc_log_filename)) { 2833 jio_fprintf(defaultStream::output_stream(), 2834 "Invalid file name for use with -Xloggc: Filename can only contain the " 2835 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2836 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2837 return JNI_EINVAL; 2838 } 2839 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 2840 return JNI_EINVAL; 2841 } 2842 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) { 2843 return JNI_EINVAL; 2844 } 2845 // JNI hooks 2846 } else if (match_option(option, "-Xcheck", &tail)) { 2847 if (!strcmp(tail, ":jni")) { 2848 #if !INCLUDE_JNI_CHECK 2849 warning("JNI CHECKING is not supported in this VM"); 2850 #else 2851 CheckJNICalls = true; 2852 #endif // INCLUDE_JNI_CHECK 2853 } else if (is_bad_option(option, args->ignoreUnrecognized, 2854 "check")) { 2855 return JNI_EINVAL; 2856 } 2857 } else if (match_option(option, "vfprintf")) { 2858 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2859 } else if (match_option(option, "exit")) { 2860 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2861 } else if (match_option(option, "abort")) { 2862 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2863 // -XX:+AggressiveHeap 2864 } else if (match_option(option, "-XX:+AggressiveHeap")) { 2865 2866 // This option inspects the machine and attempts to set various 2867 // parameters to be optimal for long-running, memory allocation 2868 // intensive jobs. It is intended for machines with large 2869 // amounts of cpu and memory. 2870 2871 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2872 // VM, but we may not be able to represent the total physical memory 2873 // available (like having 8gb of memory on a box but using a 32bit VM). 2874 // Thus, we need to make sure we're using a julong for intermediate 2875 // calculations. 2876 julong initHeapSize; 2877 julong total_memory = os::physical_memory(); 2878 2879 if (total_memory < (julong)256*M) { 2880 jio_fprintf(defaultStream::error_stream(), 2881 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2882 vm_exit(1); 2883 } 2884 2885 // The heap size is half of available memory, or (at most) 2886 // all of possible memory less 160mb (leaving room for the OS 2887 // when using ISM). This is the maximum; because adaptive sizing 2888 // is turned on below, the actual space used may be smaller. 2889 2890 initHeapSize = MIN2(total_memory / (julong)2, 2891 total_memory - (julong)160*M); 2892 2893 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2894 2895 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2896 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2897 return JNI_EINVAL; 2898 } 2899 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2900 return JNI_EINVAL; 2901 } 2902 // Currently the minimum size and the initial heap sizes are the same. 2903 set_min_heap_size(initHeapSize); 2904 } 2905 if (FLAG_IS_DEFAULT(NewSize)) { 2906 // Make the young generation 3/8ths of the total heap. 2907 if (FLAG_SET_CMDLINE(size_t, NewSize, 2908 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) { 2909 return JNI_EINVAL; 2910 } 2911 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2912 return JNI_EINVAL; 2913 } 2914 } 2915 2916 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2917 FLAG_SET_DEFAULT(UseLargePages, true); 2918 #endif 2919 2920 // Increase some data structure sizes for efficiency 2921 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2922 return JNI_EINVAL; 2923 } 2924 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2925 return JNI_EINVAL; 2926 } 2927 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) { 2928 return JNI_EINVAL; 2929 } 2930 2931 // See the OldPLABSize comment below, but replace 'after promotion' 2932 // with 'after copying'. YoungPLABSize is the size of the survivor 2933 // space per-gc-thread buffers. The default is 4kw. 2934 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) { // Note: this is in words 2935 return JNI_EINVAL; 2936 } 2937 2938 // OldPLABSize is the size of the buffers in the old gen that 2939 // UseParallelGC uses to promote live data that doesn't fit in the 2940 // survivor spaces. At any given time, there's one for each gc thread. 2941 // The default size is 1kw. These buffers are rarely used, since the 2942 // survivor spaces are usually big enough. For specjbb, however, there 2943 // are occasions when there's lots of live data in the young gen 2944 // and we end up promoting some of it. We don't have a definite 2945 // explanation for why bumping OldPLABSize helps, but the theory 2946 // is that a bigger PLAB results in retaining something like the 2947 // original allocation order after promotion, which improves mutator 2948 // locality. A minor effect may be that larger PLABs reduce the 2949 // number of PLAB allocation events during gc. The value of 8kw 2950 // was arrived at by experimenting with specjbb. 2951 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) { // Note: this is in words 2952 return JNI_EINVAL; 2953 } 2954 2955 // Enable parallel GC and adaptive generation sizing 2956 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2957 return JNI_EINVAL; 2958 } 2959 FLAG_SET_DEFAULT(ParallelGCThreads, 2960 Abstract_VM_Version::parallel_worker_threads()); 2961 2962 // Encourage steady state memory management 2963 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2964 return JNI_EINVAL; 2965 } 2966 2967 // This appears to improve mutator locality 2968 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2969 return JNI_EINVAL; 2970 } 2971 2972 // Get around early Solaris scheduling bug 2973 // (affinity vs other jobs on system) 2974 // but disallow DR and offlining (5008695). 2975 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2976 return JNI_EINVAL; 2977 } 2978 2979 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2980 // and the last option wins. 2981 } else if (match_option(option, "-XX:+NeverTenure")) { 2982 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 2983 return JNI_EINVAL; 2984 } 2985 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 2986 return JNI_EINVAL; 2987 } 2988 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 2989 return JNI_EINVAL; 2990 } 2991 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2992 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 2993 return JNI_EINVAL; 2994 } 2995 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 2996 return JNI_EINVAL; 2997 } 2998 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 2999 return JNI_EINVAL; 3000 } 3001 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3002 uintx max_tenuring_thresh = 0; 3003 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3004 jio_fprintf(defaultStream::error_stream(), 3005 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3006 return JNI_EINVAL; 3007 } 3008 3009 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3010 return JNI_EINVAL; 3011 } 3012 3013 if (MaxTenuringThreshold == 0) { 3014 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3015 return JNI_EINVAL; 3016 } 3017 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3018 return JNI_EINVAL; 3019 } 3020 } else { 3021 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3022 return JNI_EINVAL; 3023 } 3024 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3025 return JNI_EINVAL; 3026 } 3027 } 3028 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3029 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3030 return JNI_EINVAL; 3031 } 3032 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3033 return JNI_EINVAL; 3034 } 3035 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3036 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3037 return JNI_EINVAL; 3038 } 3039 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3040 return JNI_EINVAL; 3041 } 3042 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3043 #if defined(DTRACE_ENABLED) 3044 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3045 return JNI_EINVAL; 3046 } 3047 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3048 return JNI_EINVAL; 3049 } 3050 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3051 return JNI_EINVAL; 3052 } 3053 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3054 return JNI_EINVAL; 3055 } 3056 #else // defined(DTRACE_ENABLED) 3057 jio_fprintf(defaultStream::error_stream(), 3058 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3059 return JNI_EINVAL; 3060 #endif // defined(DTRACE_ENABLED) 3061 #ifdef ASSERT 3062 } else if (match_option(option, "-XX:+FullGCALot")) { 3063 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3064 return JNI_EINVAL; 3065 } 3066 // disable scavenge before parallel mark-compact 3067 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3068 return JNI_EINVAL; 3069 } 3070 #endif 3071 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3072 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3073 julong stack_size = 0; 3074 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3075 if (errcode != arg_in_range) { 3076 jio_fprintf(defaultStream::error_stream(), 3077 "Invalid mark stack size: %s\n", option->optionString); 3078 describe_range_error(errcode); 3079 return JNI_EINVAL; 3080 } 3081 jio_fprintf(defaultStream::error_stream(), 3082 "Please use -XX:MarkStackSize in place of " 3083 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3084 if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) { 3085 return JNI_EINVAL; 3086 } 3087 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3088 julong max_stack_size = 0; 3089 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3090 if (errcode != arg_in_range) { 3091 jio_fprintf(defaultStream::error_stream(), 3092 "Invalid maximum mark stack size: %s\n", 3093 option->optionString); 3094 describe_range_error(errcode); 3095 return JNI_EINVAL; 3096 } 3097 jio_fprintf(defaultStream::error_stream(), 3098 "Please use -XX:MarkStackSizeMax in place of " 3099 "-XX:CMSMarkStackSizeMax in the future\n"); 3100 if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) { 3101 return JNI_EINVAL; 3102 } 3103 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3104 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3105 uintx conc_threads = 0; 3106 if (!parse_uintx(tail, &conc_threads, 1)) { 3107 jio_fprintf(defaultStream::error_stream(), 3108 "Invalid concurrent threads: %s\n", option->optionString); 3109 return JNI_EINVAL; 3110 } 3111 jio_fprintf(defaultStream::error_stream(), 3112 "Please use -XX:ConcGCThreads in place of " 3113 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3114 if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) { 3115 return JNI_EINVAL; 3116 } 3117 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3118 julong max_direct_memory_size = 0; 3119 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3120 if (errcode != arg_in_range) { 3121 jio_fprintf(defaultStream::error_stream(), 3122 "Invalid maximum direct memory size: %s\n", 3123 option->optionString); 3124 describe_range_error(errcode); 3125 return JNI_EINVAL; 3126 } 3127 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) { 3128 return JNI_EINVAL; 3129 } 3130 #if !INCLUDE_MANAGEMENT 3131 } else if (match_option(option, "-XX:+ManagementServer")) { 3132 jio_fprintf(defaultStream::error_stream(), 3133 "ManagementServer is not supported in this VM.\n"); 3134 return JNI_ERR; 3135 #endif // INCLUDE_MANAGEMENT 3136 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash 3137 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) { 3138 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) { 3139 return JNI_EINVAL; 3140 } 3141 jio_fprintf(defaultStream::output_stream(), 3142 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n"); 3143 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) { 3144 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) { 3145 return JNI_EINVAL; 3146 } 3147 jio_fprintf(defaultStream::output_stream(), 3148 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n"); 3149 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3150 // Skip -XX:Flags= since that case has already been handled 3151 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3152 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3153 return JNI_EINVAL; 3154 } 3155 } 3156 // Unknown option 3157 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3158 return JNI_ERR; 3159 } 3160 } 3161 3162 // PrintSharedArchiveAndExit will turn on 3163 // -Xshare:on 3164 // -XX:+TraceClassPaths 3165 if (PrintSharedArchiveAndExit) { 3166 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3167 return JNI_EINVAL; 3168 } 3169 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3170 return JNI_EINVAL; 3171 } 3172 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) { 3173 return JNI_EINVAL; 3174 } 3175 } 3176 3177 // Change the default value for flags which have different default values 3178 // when working with older JDKs. 3179 #ifdef LINUX 3180 if (JDK_Version::current().compare_major(6) <= 0 && 3181 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3182 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3183 } 3184 #endif // LINUX 3185 fix_appclasspath(); 3186 return JNI_OK; 3187 } 3188 3189 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3190 // 3191 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3192 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3193 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3194 // path is treated as the current directory. 3195 // 3196 // This causes problems with CDS, which requires that all directories specified in the classpath 3197 // must be empty. In most cases, applications do NOT want to load classes from the current 3198 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3199 // scripts compatible with CDS. 3200 void Arguments::fix_appclasspath() { 3201 if (IgnoreEmptyClassPaths) { 3202 const char separator = *os::path_separator(); 3203 const char* src = _java_class_path->value(); 3204 3205 // skip over all the leading empty paths 3206 while (*src == separator) { 3207 src ++; 3208 } 3209 3210 char* copy = os::strdup_check_oom(src, mtInternal); 3211 3212 // trim all trailing empty paths 3213 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3214 *tail = '\0'; 3215 } 3216 3217 char from[3] = {separator, separator, '\0'}; 3218 char to [2] = {separator, '\0'}; 3219 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3220 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3221 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3222 } 3223 3224 _java_class_path->set_value(copy); 3225 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3226 } 3227 3228 if (!PrintSharedArchiveAndExit) { 3229 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3230 } 3231 } 3232 3233 static bool has_jar_files(const char* directory) { 3234 DIR* dir = os::opendir(directory); 3235 if (dir == NULL) return false; 3236 3237 struct dirent *entry; 3238 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3239 bool hasJarFile = false; 3240 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3241 const char* name = entry->d_name; 3242 const char* ext = name + strlen(name) - 4; 3243 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3244 } 3245 FREE_C_HEAP_ARRAY(char, dbuf); 3246 os::closedir(dir); 3247 return hasJarFile ; 3248 } 3249 3250 static int check_non_empty_dirs(const char* path) { 3251 const char separator = *os::path_separator(); 3252 const char* const end = path + strlen(path); 3253 int nonEmptyDirs = 0; 3254 while (path < end) { 3255 const char* tmp_end = strchr(path, separator); 3256 if (tmp_end == NULL) { 3257 if (has_jar_files(path)) { 3258 nonEmptyDirs++; 3259 jio_fprintf(defaultStream::output_stream(), 3260 "Non-empty directory: %s\n", path); 3261 } 3262 path = end; 3263 } else { 3264 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3265 memcpy(dirpath, path, tmp_end - path); 3266 dirpath[tmp_end - path] = '\0'; 3267 if (has_jar_files(dirpath)) { 3268 nonEmptyDirs++; 3269 jio_fprintf(defaultStream::output_stream(), 3270 "Non-empty directory: %s\n", dirpath); 3271 } 3272 FREE_C_HEAP_ARRAY(char, dirpath); 3273 path = tmp_end + 1; 3274 } 3275 } 3276 return nonEmptyDirs; 3277 } 3278 3279 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3280 // check if the default lib/endorsed directory exists; if so, error 3281 char path[JVM_MAXPATHLEN]; 3282 const char* fileSep = os::file_separator(); 3283 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3284 3285 if (CheckEndorsedAndExtDirs) { 3286 int nonEmptyDirs = 0; 3287 // check endorsed directory 3288 nonEmptyDirs += check_non_empty_dirs(path); 3289 // check the extension directories 3290 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3291 if (nonEmptyDirs > 0) { 3292 return JNI_ERR; 3293 } 3294 } 3295 3296 DIR* dir = os::opendir(path); 3297 if (dir != NULL) { 3298 jio_fprintf(defaultStream::output_stream(), 3299 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3300 "in modular form will be supported via the concept of upgradeable modules.\n"); 3301 os::closedir(dir); 3302 return JNI_ERR; 3303 } 3304 3305 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3306 dir = os::opendir(path); 3307 if (dir != NULL) { 3308 jio_fprintf(defaultStream::output_stream(), 3309 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3310 "Use -classpath instead.\n."); 3311 os::closedir(dir); 3312 return JNI_ERR; 3313 } 3314 3315 if (scp_assembly_required) { 3316 // Assemble the bootclasspath elements into the final path. 3317 Arguments::set_sysclasspath(scp_p->combined_path()); 3318 } 3319 3320 // This must be done after all arguments have been processed. 3321 // java_compiler() true means set to "NONE" or empty. 3322 if (java_compiler() && !xdebug_mode()) { 3323 // For backwards compatibility, we switch to interpreted mode if 3324 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3325 // not specified. 3326 set_mode_flags(_int); 3327 } 3328 3329 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3330 // but like -Xint, leave compilation thresholds unaffected. 3331 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3332 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3333 set_mode_flags(_int); 3334 } 3335 3336 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3337 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3338 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3339 } 3340 3341 #ifndef COMPILER2 3342 // Don't degrade server performance for footprint 3343 if (FLAG_IS_DEFAULT(UseLargePages) && 3344 MaxHeapSize < LargePageHeapSizeThreshold) { 3345 // No need for large granularity pages w/small heaps. 3346 // Note that large pages are enabled/disabled for both the 3347 // Java heap and the code cache. 3348 FLAG_SET_DEFAULT(UseLargePages, false); 3349 } 3350 3351 #else 3352 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3353 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3354 } 3355 #endif 3356 3357 #ifndef TIERED 3358 // Tiered compilation is undefined. 3359 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3360 #endif 3361 3362 // If we are running in a headless jre, force java.awt.headless property 3363 // to be true unless the property has already been set. 3364 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3365 if (os::is_headless_jre()) { 3366 const char* headless = Arguments::get_property("java.awt.headless"); 3367 if (headless == NULL) { 3368 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3369 if (headless_env == NULL) { 3370 if (!add_property("java.awt.headless=true")) { 3371 return JNI_ENOMEM; 3372 } 3373 } else { 3374 char buffer[256]; 3375 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3376 if (!add_property(buffer)) { 3377 return JNI_ENOMEM; 3378 } 3379 } 3380 } 3381 } 3382 3383 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3384 // CMS can only be used with ParNew 3385 FLAG_SET_ERGO(bool, UseParNewGC, true); 3386 } 3387 3388 if (!check_vm_args_consistency()) { 3389 return JNI_ERR; 3390 } 3391 3392 return JNI_OK; 3393 } 3394 3395 // Helper class for controlling the lifetime of JavaVMInitArgs 3396 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3397 // deleted on the destruction of the ScopedVMInitArgs object. 3398 class ScopedVMInitArgs : public StackObj { 3399 private: 3400 JavaVMInitArgs _args; 3401 3402 public: 3403 ScopedVMInitArgs() { 3404 _args.version = JNI_VERSION_1_2; 3405 _args.nOptions = 0; 3406 _args.options = NULL; 3407 _args.ignoreUnrecognized = false; 3408 } 3409 3410 // Populates the JavaVMInitArgs object represented by this 3411 // ScopedVMInitArgs object with the arguments in options. The 3412 // allocated memory is deleted by the destructor. If this method 3413 // returns anything other than JNI_OK, then this object is in a 3414 // partially constructed state, and should be abandoned. 3415 jint set_args(GrowableArray<JavaVMOption>* options) { 3416 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3417 JavaVMOption, options->length(), mtInternal); 3418 if (options_arr == NULL) { 3419 return JNI_ENOMEM; 3420 } 3421 _args.options = options_arr; 3422 3423 for (int i = 0; i < options->length(); i++) { 3424 options_arr[i] = options->at(i); 3425 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3426 if (options_arr[i].optionString == NULL) { 3427 // Rely on the destructor to do cleanup. 3428 _args.nOptions = i; 3429 return JNI_ENOMEM; 3430 } 3431 } 3432 3433 _args.nOptions = options->length(); 3434 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3435 return JNI_OK; 3436 } 3437 3438 JavaVMInitArgs* get() { return &_args; } 3439 3440 ~ScopedVMInitArgs() { 3441 if (_args.options == NULL) return; 3442 for (int i = 0; i < _args.nOptions; i++) { 3443 os::free(_args.options[i].optionString); 3444 } 3445 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3446 } 3447 }; 3448 3449 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3450 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3451 } 3452 3453 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3454 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3455 } 3456 3457 jint Arguments::parse_options_environment_variable(const char* name, 3458 ScopedVMInitArgs* vm_args) { 3459 char *buffer = ::getenv(name); 3460 3461 // Don't check this environment variable if user has special privileges 3462 // (e.g. unix su command). 3463 if (buffer == NULL || os::have_special_privileges()) { 3464 return JNI_OK; 3465 } 3466 3467 if ((buffer = os::strdup(buffer)) == NULL) { 3468 return JNI_ENOMEM; 3469 } 3470 3471 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3472 jio_fprintf(defaultStream::error_stream(), 3473 "Picked up %s: %s\n", name, buffer); 3474 char* rd = buffer; // pointer to the input string (rd) 3475 while (true) { // repeat for all options in the input string 3476 while (isspace(*rd)) rd++; // skip whitespace 3477 if (*rd == 0) break; // we re done when the input string is read completely 3478 3479 // The output, option string, overwrites the input string. 3480 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3481 // input string (rd). 3482 char* wrt = rd; 3483 3484 JavaVMOption option; 3485 option.optionString = wrt; 3486 options->append(option); // Fill in option 3487 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3488 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3489 int quote = *rd; // matching quote to look for 3490 rd++; // don't copy open quote 3491 while (*rd != quote) { // include everything (even spaces) up until quote 3492 if (*rd == 0) { // string termination means unmatched string 3493 jio_fprintf(defaultStream::error_stream(), 3494 "Unmatched quote in %s\n", name); 3495 delete options; 3496 os::free(buffer); 3497 return JNI_ERR; 3498 } 3499 *wrt++ = *rd++; // copy to option string 3500 } 3501 rd++; // don't copy close quote 3502 } else { 3503 *wrt++ = *rd++; // copy to option string 3504 } 3505 } 3506 if (*rd != 0) { 3507 // In this case, the assignment to wrt below will make *rd nul, 3508 // which will interfere with the next loop iteration. 3509 rd++; 3510 } 3511 *wrt = 0; // Zero terminate option 3512 } 3513 3514 // Fill out JavaVMInitArgs structure. 3515 jint status = vm_args->set_args(options); 3516 3517 delete options; 3518 os::free(buffer); 3519 return status; 3520 } 3521 3522 void Arguments::set_shared_spaces_flags() { 3523 if (DumpSharedSpaces) { 3524 if (RequireSharedSpaces) { 3525 warning("cannot dump shared archive while using shared archive"); 3526 } 3527 UseSharedSpaces = false; 3528 #ifdef _LP64 3529 if (!UseCompressedOops || !UseCompressedClassPointers) { 3530 vm_exit_during_initialization( 3531 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3532 } 3533 } else { 3534 if (!UseCompressedOops || !UseCompressedClassPointers) { 3535 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3536 } 3537 #endif 3538 } 3539 } 3540 3541 #if !INCLUDE_ALL_GCS 3542 static void force_serial_gc() { 3543 FLAG_SET_DEFAULT(UseSerialGC, true); 3544 UNSUPPORTED_GC_OPTION(UseG1GC); 3545 UNSUPPORTED_GC_OPTION(UseParallelGC); 3546 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3547 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3548 UNSUPPORTED_GC_OPTION(UseParNewGC); 3549 } 3550 #endif // INCLUDE_ALL_GCS 3551 3552 // Sharing support 3553 // Construct the path to the archive 3554 static char* get_shared_archive_path() { 3555 char *shared_archive_path; 3556 if (SharedArchiveFile == NULL) { 3557 char jvm_path[JVM_MAXPATHLEN]; 3558 os::jvm_path(jvm_path, sizeof(jvm_path)); 3559 char *end = strrchr(jvm_path, *os::file_separator()); 3560 if (end != NULL) *end = '\0'; 3561 size_t jvm_path_len = strlen(jvm_path); 3562 size_t file_sep_len = strlen(os::file_separator()); 3563 const size_t len = jvm_path_len + file_sep_len + 20; 3564 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3565 if (shared_archive_path != NULL) { 3566 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3567 jvm_path, os::file_separator()); 3568 } 3569 } else { 3570 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal); 3571 } 3572 return shared_archive_path; 3573 } 3574 3575 #ifndef PRODUCT 3576 // Determine whether LogVMOutput should be implicitly turned on. 3577 static bool use_vm_log() { 3578 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3579 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3580 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3581 PrintAssembly || TraceDeoptimization || TraceDependencies || 3582 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3583 return true; 3584 } 3585 3586 #ifdef COMPILER1 3587 if (PrintC1Statistics) { 3588 return true; 3589 } 3590 #endif // COMPILER1 3591 3592 #ifdef COMPILER2 3593 if (PrintOptoAssembly || PrintOptoStatistics) { 3594 return true; 3595 } 3596 #endif // COMPILER2 3597 3598 return false; 3599 } 3600 #endif // PRODUCT 3601 3602 static jint match_special_option_and_act(const JavaVMInitArgs* args, 3603 char** flags_file) { 3604 // Remaining part of option string 3605 const char* tail; 3606 3607 for (int index = 0; index < args->nOptions; index++) { 3608 const JavaVMOption* option = args->options + index; 3609 if (ArgumentsExt::process_options(option)) { 3610 continue; 3611 } 3612 if (match_option(option, "-XX:Flags=", &tail)) { 3613 *flags_file = (char *) tail; 3614 continue; 3615 } 3616 if (match_option(option, "-XX:+PrintVMOptions")) { 3617 PrintVMOptions = true; 3618 continue; 3619 } 3620 if (match_option(option, "-XX:-PrintVMOptions")) { 3621 PrintVMOptions = false; 3622 continue; 3623 } 3624 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3625 IgnoreUnrecognizedVMOptions = true; 3626 continue; 3627 } 3628 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3629 IgnoreUnrecognizedVMOptions = false; 3630 continue; 3631 } 3632 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3633 CommandLineFlags::printFlags(tty, false); 3634 vm_exit(0); 3635 } 3636 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3637 #if INCLUDE_NMT 3638 // The launcher did not setup nmt environment variable properly. 3639 if (!MemTracker::check_launcher_nmt_support(tail)) { 3640 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3641 } 3642 3643 // Verify if nmt option is valid. 3644 if (MemTracker::verify_nmt_option()) { 3645 // Late initialization, still in single-threaded mode. 3646 if (MemTracker::tracking_level() >= NMT_summary) { 3647 MemTracker::init(); 3648 } 3649 } else { 3650 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3651 } 3652 continue; 3653 #else 3654 jio_fprintf(defaultStream::error_stream(), 3655 "Native Memory Tracking is not supported in this VM\n"); 3656 return JNI_ERR; 3657 #endif 3658 } 3659 3660 #ifndef PRODUCT 3661 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3662 CommandLineFlags::printFlags(tty, true); 3663 vm_exit(0); 3664 } 3665 #endif 3666 } 3667 return JNI_OK; 3668 } 3669 3670 static void print_options(const JavaVMInitArgs *args) { 3671 const char* tail; 3672 for (int index = 0; index < args->nOptions; index++) { 3673 const JavaVMOption *option = args->options + index; 3674 if (match_option(option, "-XX:", &tail)) { 3675 logOption(tail); 3676 } 3677 } 3678 } 3679 3680 // Parse entry point called from JNI_CreateJavaVM 3681 3682 jint Arguments::parse(const JavaVMInitArgs* args) { 3683 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3684 const char* hotspotrc = ".hotspotrc"; 3685 char* flags_file = NULL; 3686 bool settings_file_specified = false; 3687 bool needs_hotspotrc_warning = false; 3688 ScopedVMInitArgs java_tool_options_args; 3689 ScopedVMInitArgs java_options_args; 3690 3691 jint code = 3692 parse_java_tool_options_environment_variable(&java_tool_options_args); 3693 if (code != JNI_OK) { 3694 return code; 3695 } 3696 3697 code = parse_java_options_environment_variable(&java_options_args); 3698 if (code != JNI_OK) { 3699 return code; 3700 } 3701 3702 code = 3703 match_special_option_and_act(java_tool_options_args.get(), &flags_file); 3704 if (code != JNI_OK) { 3705 return code; 3706 } 3707 3708 code = match_special_option_and_act(args, &flags_file); 3709 if (code != JNI_OK) { 3710 return code; 3711 } 3712 3713 code = match_special_option_and_act(java_options_args.get(), &flags_file); 3714 if (code != JNI_OK) { 3715 return code; 3716 } 3717 3718 settings_file_specified = (flags_file != NULL); 3719 3720 if (IgnoreUnrecognizedVMOptions) { 3721 // uncast const to modify the flag args->ignoreUnrecognized 3722 *(jboolean*)(&args->ignoreUnrecognized) = true; 3723 java_tool_options_args.get()->ignoreUnrecognized = true; 3724 java_options_args.get()->ignoreUnrecognized = true; 3725 } 3726 3727 // Parse specified settings file 3728 if (settings_file_specified) { 3729 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3730 return JNI_EINVAL; 3731 } 3732 } else { 3733 #ifdef ASSERT 3734 // Parse default .hotspotrc settings file 3735 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3736 return JNI_EINVAL; 3737 } 3738 #else 3739 struct stat buf; 3740 if (os::stat(hotspotrc, &buf) == 0) { 3741 needs_hotspotrc_warning = true; 3742 } 3743 #endif 3744 } 3745 3746 if (PrintVMOptions) { 3747 print_options(java_tool_options_args.get()); 3748 print_options(args); 3749 print_options(java_options_args.get()); 3750 } 3751 3752 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3753 jint result = parse_vm_init_args(java_tool_options_args.get(), 3754 java_options_args.get(), args); 3755 3756 if (result != JNI_OK) { 3757 return result; 3758 } 3759 3760 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3761 SharedArchivePath = get_shared_archive_path(); 3762 if (SharedArchivePath == NULL) { 3763 return JNI_ENOMEM; 3764 } 3765 3766 // Set up VerifySharedSpaces 3767 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3768 VerifySharedSpaces = true; 3769 } 3770 3771 // Delay warning until here so that we've had a chance to process 3772 // the -XX:-PrintWarnings flag 3773 if (needs_hotspotrc_warning) { 3774 warning("%s file is present but has been ignored. " 3775 "Run with -XX:Flags=%s to load the file.", 3776 hotspotrc, hotspotrc); 3777 } 3778 3779 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3780 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3781 #endif 3782 3783 ArgumentsExt::report_unsupported_options(); 3784 3785 #ifndef PRODUCT 3786 if (TraceBytecodesAt != 0) { 3787 TraceBytecodes = true; 3788 } 3789 if (CountCompiledCalls) { 3790 if (UseCounterDecay) { 3791 warning("UseCounterDecay disabled because CountCalls is set"); 3792 UseCounterDecay = false; 3793 } 3794 } 3795 #endif // PRODUCT 3796 3797 if (ScavengeRootsInCode == 0) { 3798 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3799 warning("forcing ScavengeRootsInCode non-zero"); 3800 } 3801 ScavengeRootsInCode = 1; 3802 } 3803 3804 if (PrintGCDetails) { 3805 // Turn on -verbose:gc options as well 3806 PrintGC = true; 3807 } 3808 3809 // Set object alignment values. 3810 set_object_alignment(); 3811 3812 #if !INCLUDE_ALL_GCS 3813 force_serial_gc(); 3814 #endif // INCLUDE_ALL_GCS 3815 #if !INCLUDE_CDS 3816 if (DumpSharedSpaces || RequireSharedSpaces) { 3817 jio_fprintf(defaultStream::error_stream(), 3818 "Shared spaces are not supported in this VM\n"); 3819 return JNI_ERR; 3820 } 3821 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3822 warning("Shared spaces are not supported in this VM"); 3823 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3824 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3825 } 3826 no_shared_spaces("CDS Disabled"); 3827 #endif // INCLUDE_CDS 3828 3829 return JNI_OK; 3830 } 3831 3832 jint Arguments::apply_ergo() { 3833 3834 // Set flags based on ergonomics. 3835 set_ergonomics_flags(); 3836 3837 set_shared_spaces_flags(); 3838 3839 // Check the GC selections again. 3840 if (!check_gc_consistency()) { 3841 return JNI_EINVAL; 3842 } 3843 3844 if (TieredCompilation) { 3845 set_tiered_flags(); 3846 } else { 3847 int max_compilation_policy_choice = 1; 3848 #ifdef COMPILER2 3849 max_compilation_policy_choice = 2; 3850 #endif 3851 // Check if the policy is valid. 3852 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 3853 vm_exit_during_initialization( 3854 "Incompatible compilation policy selected", NULL); 3855 } 3856 // Scale CompileThreshold 3857 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3858 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3859 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3860 } 3861 } 3862 3863 #ifdef COMPILER2 3864 #ifndef PRODUCT 3865 if (PrintIdealGraphLevel > 0) { 3866 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3867 } 3868 #endif 3869 #endif 3870 3871 // Set heap size based on available physical memory 3872 set_heap_size(); 3873 3874 ArgumentsExt::set_gc_specific_flags(); 3875 3876 // Initialize Metaspace flags and alignments 3877 Metaspace::ergo_initialize(); 3878 3879 // Set bytecode rewriting flags 3880 set_bytecode_flags(); 3881 3882 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3883 set_aggressive_opts_flags(); 3884 3885 // Turn off biased locking for locking debug mode flags, 3886 // which are subtly different from each other but neither works with 3887 // biased locking 3888 if (UseHeavyMonitors 3889 #ifdef COMPILER1 3890 || !UseFastLocking 3891 #endif // COMPILER1 3892 ) { 3893 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3894 // flag set to true on command line; warn the user that they 3895 // can't enable biased locking here 3896 warning("Biased Locking is not supported with locking debug flags" 3897 "; ignoring UseBiasedLocking flag." ); 3898 } 3899 UseBiasedLocking = false; 3900 } 3901 3902 #ifdef ZERO 3903 // Clear flags not supported on zero. 3904 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3905 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3906 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3907 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3908 #endif // CC_INTERP 3909 3910 #ifdef COMPILER2 3911 if (!EliminateLocks) { 3912 EliminateNestedLocks = false; 3913 } 3914 if (!Inline) { 3915 IncrementalInline = false; 3916 } 3917 #ifndef PRODUCT 3918 if (!IncrementalInline) { 3919 AlwaysIncrementalInline = false; 3920 } 3921 #endif 3922 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3923 // nothing to use the profiling, turn if off 3924 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3925 } 3926 #endif 3927 3928 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3929 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3930 DebugNonSafepoints = true; 3931 } 3932 3933 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3934 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3935 } 3936 3937 #ifndef PRODUCT 3938 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3939 if (use_vm_log()) { 3940 LogVMOutput = true; 3941 } 3942 } 3943 #endif // PRODUCT 3944 3945 if (PrintCommandLineFlags) { 3946 CommandLineFlags::printSetFlags(tty); 3947 } 3948 3949 // Apply CPU specific policy for the BiasedLocking 3950 if (UseBiasedLocking) { 3951 if (!VM_Version::use_biased_locking() && 3952 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3953 UseBiasedLocking = false; 3954 } 3955 } 3956 #ifdef COMPILER2 3957 if (!UseBiasedLocking || EmitSync != 0) { 3958 UseOptoBiasInlining = false; 3959 } 3960 #endif 3961 3962 return JNI_OK; 3963 } 3964 3965 jint Arguments::adjust_after_os() { 3966 if (UseNUMA) { 3967 if (UseParallelGC || UseParallelOldGC) { 3968 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3969 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3970 } 3971 } 3972 // UseNUMAInterleaving is set to ON for all collectors and 3973 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3974 // such as the parallel collector for Linux and Solaris will 3975 // interleave old gen and survivor spaces on top of NUMA 3976 // allocation policy for the eden space. 3977 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3978 // all platforms and ParallelGC on Windows will interleave all 3979 // of the heap spaces across NUMA nodes. 3980 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3981 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3982 } 3983 } 3984 return JNI_OK; 3985 } 3986 3987 // Any custom code post the final range and constraint check 3988 // can be done here. We pass a flag that specifies whether 3989 // the check passed successfully 3990 void Arguments::post_final_range_and_constraint_check(bool check_passed) { 3991 // This does not set the flag itself, but stores the value in a safe place for later usage. 3992 _min_heap_free_ratio = MinHeapFreeRatio; 3993 _max_heap_free_ratio = MaxHeapFreeRatio; 3994 } 3995 3996 int Arguments::PropertyList_count(SystemProperty* pl) { 3997 int count = 0; 3998 while(pl != NULL) { 3999 count++; 4000 pl = pl->next(); 4001 } 4002 return count; 4003 } 4004 4005 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4006 assert(key != NULL, "just checking"); 4007 SystemProperty* prop; 4008 for (prop = pl; prop != NULL; prop = prop->next()) { 4009 if (strcmp(key, prop->key()) == 0) return prop->value(); 4010 } 4011 return NULL; 4012 } 4013 4014 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4015 int count = 0; 4016 const char* ret_val = NULL; 4017 4018 while(pl != NULL) { 4019 if(count >= index) { 4020 ret_val = pl->key(); 4021 break; 4022 } 4023 count++; 4024 pl = pl->next(); 4025 } 4026 4027 return ret_val; 4028 } 4029 4030 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4031 int count = 0; 4032 char* ret_val = NULL; 4033 4034 while(pl != NULL) { 4035 if(count >= index) { 4036 ret_val = pl->value(); 4037 break; 4038 } 4039 count++; 4040 pl = pl->next(); 4041 } 4042 4043 return ret_val; 4044 } 4045 4046 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4047 SystemProperty* p = *plist; 4048 if (p == NULL) { 4049 *plist = new_p; 4050 } else { 4051 while (p->next() != NULL) { 4052 p = p->next(); 4053 } 4054 p->set_next(new_p); 4055 } 4056 } 4057 4058 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, char* v) { 4059 if (plist == NULL) 4060 return; 4061 4062 SystemProperty* new_p = new SystemProperty(k, v, true); 4063 PropertyList_add(plist, new_p); 4064 } 4065 4066 void Arguments::PropertyList_add(SystemProperty *element) { 4067 PropertyList_add(&_system_properties, element); 4068 } 4069 4070 // This add maintains unique property key in the list. 4071 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, char* v, jboolean append) { 4072 if (plist == NULL) 4073 return; 4074 4075 // If property key exist then update with new value. 4076 SystemProperty* prop; 4077 for (prop = *plist; prop != NULL; prop = prop->next()) { 4078 if (strcmp(k, prop->key()) == 0) { 4079 if (append) { 4080 prop->append_value(v); 4081 } else { 4082 prop->set_value(v); 4083 } 4084 return; 4085 } 4086 } 4087 4088 PropertyList_add(plist, k, v); 4089 } 4090 4091 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4092 // Returns true if all of the source pointed by src has been copied over to 4093 // the destination buffer pointed by buf. Otherwise, returns false. 4094 // Notes: 4095 // 1. If the length (buflen) of the destination buffer excluding the 4096 // NULL terminator character is not long enough for holding the expanded 4097 // pid characters, it also returns false instead of returning the partially 4098 // expanded one. 4099 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4100 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4101 char* buf, size_t buflen) { 4102 const char* p = src; 4103 char* b = buf; 4104 const char* src_end = &src[srclen]; 4105 char* buf_end = &buf[buflen - 1]; 4106 4107 while (p < src_end && b < buf_end) { 4108 if (*p == '%') { 4109 switch (*(++p)) { 4110 case '%': // "%%" ==> "%" 4111 *b++ = *p++; 4112 break; 4113 case 'p': { // "%p" ==> current process id 4114 // buf_end points to the character before the last character so 4115 // that we could write '\0' to the end of the buffer. 4116 size_t buf_sz = buf_end - b + 1; 4117 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4118 4119 // if jio_snprintf fails or the buffer is not long enough to hold 4120 // the expanded pid, returns false. 4121 if (ret < 0 || ret >= (int)buf_sz) { 4122 return false; 4123 } else { 4124 b += ret; 4125 assert(*b == '\0', "fail in copy_expand_pid"); 4126 if (p == src_end && b == buf_end + 1) { 4127 // reach the end of the buffer. 4128 return true; 4129 } 4130 } 4131 p++; 4132 break; 4133 } 4134 default : 4135 *b++ = '%'; 4136 } 4137 } else { 4138 *b++ = *p++; 4139 } 4140 } 4141 *b = '\0'; 4142 return (p == src_end); // return false if not all of the source was copied 4143 }