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 Arguments::Mode Arguments::_mode = _mixed; 85 bool Arguments::_java_compiler = false; 86 bool Arguments::_xdebug_mode = false; 87 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 89 int Arguments::_sun_java_launcher_pid = -1; 90 bool Arguments::_sun_java_launcher_is_altjvm = false; 91 92 // These parameters are reset in method parse_vm_init_args() 93 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 94 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 95 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 96 bool Arguments::_ClipInlining = ClipInlining; 97 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 98 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 99 100 char* Arguments::SharedArchivePath = NULL; 101 102 AgentLibraryList Arguments::_libraryList; 103 AgentLibraryList Arguments::_agentList; 104 105 abort_hook_t Arguments::_abort_hook = NULL; 106 exit_hook_t Arguments::_exit_hook = NULL; 107 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 108 109 110 SystemProperty *Arguments::_sun_boot_library_path = NULL; 111 SystemProperty *Arguments::_java_library_path = NULL; 112 SystemProperty *Arguments::_java_home = NULL; 113 SystemProperty *Arguments::_java_class_path = NULL; 114 SystemProperty *Arguments::_sun_boot_class_path = NULL; 115 116 char* Arguments::_ext_dirs = NULL; 117 118 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 119 // part of the option string. 120 static bool match_option(const JavaVMOption *option, const char* name, 121 const char** tail) { 122 int len = (int)strlen(name); 123 if (strncmp(option->optionString, name, len) == 0) { 124 *tail = option->optionString + len; 125 return true; 126 } else { 127 return false; 128 } 129 } 130 131 // Check if 'option' matches 'name'. No "tail" is allowed. 132 static bool match_option(const JavaVMOption *option, const char* name) { 133 const char* tail = NULL; 134 bool result = match_option(option, name, &tail); 135 if (tail != NULL && *tail == '\0') { 136 return result; 137 } else { 138 return false; 139 } 140 } 141 142 // Return true if any of the strings in null-terminated array 'names' matches. 143 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 144 // the option must match exactly. 145 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 146 bool tail_allowed) { 147 for (/* empty */; *names != NULL; ++names) { 148 if (match_option(option, *names, tail)) { 149 if (**tail == '\0' || tail_allowed && **tail == ':') { 150 return true; 151 } 152 } 153 } 154 return false; 155 } 156 157 static void logOption(const char* opt) { 158 if (PrintVMOptions) { 159 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 160 } 161 } 162 163 // Process java launcher properties. 164 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 165 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 166 // sun.java.launcher.pid is defined. 167 // Must do this before setting up other system properties, 168 // as some of them may depend on launcher type. 169 for (int index = 0; index < args->nOptions; index++) { 170 const JavaVMOption* option = args->options + index; 171 const char* tail; 172 173 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 174 process_java_launcher_argument(tail, option->extraInfo); 175 continue; 176 } 177 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 178 if (strcmp(tail, "true") == 0) { 179 _sun_java_launcher_is_altjvm = true; 180 } 181 continue; 182 } 183 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 184 _sun_java_launcher_pid = atoi(tail); 185 continue; 186 } 187 } 188 } 189 190 // Initialize system properties key and value. 191 void Arguments::init_system_properties() { 192 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 193 "Java Virtual Machine Specification", false)); 194 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 195 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 196 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 197 198 // Following are JVMTI agent writable properties. 199 // Properties values are set to NULL and they are 200 // os specific they are initialized in os::init_system_properties_values(). 201 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 202 _java_library_path = new SystemProperty("java.library.path", NULL, true); 203 _java_home = new SystemProperty("java.home", NULL, true); 204 _sun_boot_class_path = new SystemProperty("sun.boot.class.path", NULL, true); 205 206 _java_class_path = new SystemProperty("java.class.path", "", true); 207 208 // Add to System Property list. 209 PropertyList_add(&_system_properties, _sun_boot_library_path); 210 PropertyList_add(&_system_properties, _java_library_path); 211 PropertyList_add(&_system_properties, _java_home); 212 PropertyList_add(&_system_properties, _java_class_path); 213 PropertyList_add(&_system_properties, _sun_boot_class_path); 214 215 // Set OS specific system properties values 216 os::init_system_properties_values(); 217 } 218 219 // Update/Initialize System properties after JDK version number is known 220 void Arguments::init_version_specific_system_properties() { 221 enum { bufsz = 16 }; 222 char buffer[bufsz]; 223 const char* spec_vendor = "Sun Microsystems Inc."; 224 uint32_t spec_version = 0; 225 226 spec_vendor = "Oracle Corporation"; 227 spec_version = JDK_Version::current().major_version(); 228 jio_snprintf(buffer, bufsz, "1." UINT32_FORMAT, spec_version); 229 230 PropertyList_add(&_system_properties, 231 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 232 PropertyList_add(&_system_properties, 233 new SystemProperty("java.vm.specification.version", buffer, false)); 234 PropertyList_add(&_system_properties, 235 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 236 } 237 238 /** 239 * Provide a slightly more user-friendly way of eliminating -XX flags. 240 * When a flag is eliminated, it can be added to this list in order to 241 * continue accepting this flag on the command-line, while issuing a warning 242 * and ignoring the value. Once the JDK version reaches the 'accept_until' 243 * limit, we flatly refuse to admit the existence of the flag. This allows 244 * a flag to die correctly over JDK releases using HSX. 245 * But now that HSX is no longer supported only options with a future 246 * accept_until value need to be listed, and the list can be pruned 247 * on each major release. 248 */ 249 typedef struct { 250 const char* name; 251 JDK_Version obsoleted_in; // when the flag went away 252 JDK_Version accept_until; // which version to start denying the existence 253 } ObsoleteFlag; 254 255 static ObsoleteFlag obsolete_jvm_flags[] = { 256 { "UseOldInlining", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 257 { "SafepointPollOffset", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 258 { "UseBoundThreads", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 259 { "DefaultThreadPriority", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 260 { "NoYieldsInMicrolock", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 261 { "BackEdgeThreshold", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 262 { "UseNewReflection", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 263 { "ReflectionWrapResolutionErrors",JDK_Version::jdk(9), JDK_Version::jdk(10) }, 264 { "VerifyReflectionBytecodes", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 265 { "AutoShutdownNMT", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 266 { "NmethodSweepFraction", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 267 { "NmethodSweepCheckInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 268 { "CodeCacheMinimumFreeSpace", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 269 #ifndef ZERO 270 { "UseFastAccessorMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 271 { "UseFastEmptyMethods", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 272 #endif // ZERO 273 { "UseCompilerSafepoints", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 274 { "AdaptiveSizePausePolicy", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 275 { "ParallelGCRetainPLAB", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 276 { "ThreadSafetyMargin", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 277 { "LazyBootClassLoader", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 278 { "StarvationMonitorInterval", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 279 { "PreInflateSpin", JDK_Version::jdk(9), JDK_Version::jdk(10) }, 280 { NULL, JDK_Version(0), JDK_Version(0) } 281 }; 282 283 // Returns true if the flag is obsolete and fits into the range specified 284 // for being ignored. In the case that the flag is ignored, the 'version' 285 // value is filled in with the version number when the flag became 286 // obsolete so that that value can be displayed to the user. 287 bool Arguments::is_newly_obsolete(const char *s, JDK_Version* version) { 288 int i = 0; 289 assert(version != NULL, "Must provide a version buffer"); 290 while (obsolete_jvm_flags[i].name != NULL) { 291 const ObsoleteFlag& flag_status = obsolete_jvm_flags[i]; 292 // <flag>=xxx form 293 // [-|+]<flag> form 294 size_t len = strlen(flag_status.name); 295 if ((strncmp(flag_status.name, s, len) == 0) && 296 (strlen(s) == len)){ 297 if (JDK_Version::current().compare(flag_status.accept_until) == -1) { 298 *version = flag_status.obsoleted_in; 299 return true; 300 } 301 } 302 i++; 303 } 304 return false; 305 } 306 307 // Constructs the system class path (aka boot class path) from the following 308 // components, in order: 309 // 310 // prefix // from -Xbootclasspath/p:... 311 // base // from os::get_system_properties() or -Xbootclasspath= 312 // suffix // from -Xbootclasspath/a:... 313 // 314 // This could be AllStatic, but it isn't needed after argument processing is 315 // complete. 316 class SysClassPath: public StackObj { 317 public: 318 SysClassPath(const char* base); 319 ~SysClassPath(); 320 321 inline void set_base(const char* base); 322 inline void add_prefix(const char* prefix); 323 inline void add_suffix_to_prefix(const char* suffix); 324 inline void add_suffix(const char* suffix); 325 inline void reset_path(const char* base); 326 327 inline const char* get_base() const { return _items[_scp_base]; } 328 inline const char* get_prefix() const { return _items[_scp_prefix]; } 329 inline const char* get_suffix() const { return _items[_scp_suffix]; } 330 331 // Combine all the components into a single c-heap-allocated string; caller 332 // must free the string if/when no longer needed. 333 char* combined_path(); 334 335 private: 336 // Utility routines. 337 static char* add_to_path(const char* path, const char* str, bool prepend); 338 static char* add_jars_to_path(char* path, const char* directory); 339 340 inline void reset_item_at(int index); 341 342 // Array indices for the items that make up the sysclasspath. All except the 343 // base are allocated in the C heap and freed by this class. 344 enum { 345 _scp_prefix, // from -Xbootclasspath/p:... 346 _scp_base, // the default sysclasspath 347 _scp_suffix, // from -Xbootclasspath/a:... 348 _scp_nitems // the number of items, must be last. 349 }; 350 351 const char* _items[_scp_nitems]; 352 }; 353 354 SysClassPath::SysClassPath(const char* base) { 355 memset(_items, 0, sizeof(_items)); 356 _items[_scp_base] = base; 357 } 358 359 SysClassPath::~SysClassPath() { 360 // Free everything except the base. 361 for (int i = 0; i < _scp_nitems; ++i) { 362 if (i != _scp_base) reset_item_at(i); 363 } 364 } 365 366 inline void SysClassPath::set_base(const char* base) { 367 _items[_scp_base] = base; 368 } 369 370 inline void SysClassPath::add_prefix(const char* prefix) { 371 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], prefix, true); 372 } 373 374 inline void SysClassPath::add_suffix_to_prefix(const char* suffix) { 375 _items[_scp_prefix] = add_to_path(_items[_scp_prefix], suffix, false); 376 } 377 378 inline void SysClassPath::add_suffix(const char* suffix) { 379 _items[_scp_suffix] = add_to_path(_items[_scp_suffix], suffix, false); 380 } 381 382 inline void SysClassPath::reset_item_at(int index) { 383 assert(index < _scp_nitems && index != _scp_base, "just checking"); 384 if (_items[index] != NULL) { 385 FREE_C_HEAP_ARRAY(char, _items[index]); 386 _items[index] = NULL; 387 } 388 } 389 390 inline void SysClassPath::reset_path(const char* base) { 391 // Clear the prefix and suffix. 392 reset_item_at(_scp_prefix); 393 reset_item_at(_scp_suffix); 394 set_base(base); 395 } 396 397 //------------------------------------------------------------------------------ 398 399 400 // Combine the bootclasspath elements, some of which may be null, into a single 401 // c-heap-allocated string. 402 char* SysClassPath::combined_path() { 403 assert(_items[_scp_base] != NULL, "empty default sysclasspath"); 404 405 size_t lengths[_scp_nitems]; 406 size_t total_len = 0; 407 408 const char separator = *os::path_separator(); 409 410 // Get the lengths. 411 int i; 412 for (i = 0; i < _scp_nitems; ++i) { 413 if (_items[i] != NULL) { 414 lengths[i] = strlen(_items[i]); 415 // Include space for the separator char (or a NULL for the last item). 416 total_len += lengths[i] + 1; 417 } 418 } 419 assert(total_len > 0, "empty sysclasspath not allowed"); 420 421 // Copy the _items to a single string. 422 char* cp = NEW_C_HEAP_ARRAY(char, total_len, mtInternal); 423 char* cp_tmp = cp; 424 for (i = 0; i < _scp_nitems; ++i) { 425 if (_items[i] != NULL) { 426 memcpy(cp_tmp, _items[i], lengths[i]); 427 cp_tmp += lengths[i]; 428 *cp_tmp++ = separator; 429 } 430 } 431 *--cp_tmp = '\0'; // Replace the extra separator. 432 return cp; 433 } 434 435 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 436 char* 437 SysClassPath::add_to_path(const char* path, const char* str, bool prepend) { 438 char *cp; 439 440 assert(str != NULL, "just checking"); 441 if (path == NULL) { 442 size_t len = strlen(str) + 1; 443 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 444 memcpy(cp, str, len); // copy the trailing null 445 } else { 446 const char separator = *os::path_separator(); 447 size_t old_len = strlen(path); 448 size_t str_len = strlen(str); 449 size_t len = old_len + str_len + 2; 450 451 if (prepend) { 452 cp = NEW_C_HEAP_ARRAY(char, len, mtInternal); 453 char* cp_tmp = cp; 454 memcpy(cp_tmp, str, str_len); 455 cp_tmp += str_len; 456 *cp_tmp = separator; 457 memcpy(++cp_tmp, path, old_len + 1); // copy the trailing null 458 FREE_C_HEAP_ARRAY(char, path); 459 } else { 460 cp = REALLOC_C_HEAP_ARRAY(char, path, len, mtInternal); 461 char* cp_tmp = cp + old_len; 462 *cp_tmp = separator; 463 memcpy(++cp_tmp, str, str_len + 1); // copy the trailing null 464 } 465 } 466 return cp; 467 } 468 469 // Scan the directory and append any jar or zip files found to path. 470 // Note: path must be c-heap-allocated (or NULL); it is freed if non-null. 471 char* SysClassPath::add_jars_to_path(char* path, const char* directory) { 472 DIR* dir = os::opendir(directory); 473 if (dir == NULL) return path; 474 475 char dir_sep[2] = { '\0', '\0' }; 476 size_t directory_len = strlen(directory); 477 const char fileSep = *os::file_separator(); 478 if (directory[directory_len - 1] != fileSep) dir_sep[0] = fileSep; 479 480 /* Scan the directory for jars/zips, appending them to path. */ 481 struct dirent *entry; 482 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 483 while ((entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 484 const char* name = entry->d_name; 485 const char* ext = name + strlen(name) - 4; 486 bool isJarOrZip = ext > name && 487 (os::file_name_strcmp(ext, ".jar") == 0 || 488 os::file_name_strcmp(ext, ".zip") == 0); 489 if (isJarOrZip) { 490 char* jarpath = NEW_C_HEAP_ARRAY(char, directory_len + 2 + strlen(name), mtInternal); 491 sprintf(jarpath, "%s%s%s", directory, dir_sep, name); 492 path = add_to_path(path, jarpath, false); 493 FREE_C_HEAP_ARRAY(char, jarpath); 494 } 495 } 496 FREE_C_HEAP_ARRAY(char, dbuf); 497 os::closedir(dir); 498 return path; 499 } 500 501 // Parses a memory size specification string. 502 static bool atomull(const char *s, julong* result) { 503 julong n = 0; 504 int args_read = 0; 505 bool is_hex = false; 506 // Skip leading 0[xX] for hexadecimal 507 if (*s =='0' && (*(s+1) == 'x' || *(s+1) == 'X')) { 508 s += 2; 509 is_hex = true; 510 args_read = sscanf(s, JULONG_FORMAT_X, &n); 511 } else { 512 args_read = sscanf(s, JULONG_FORMAT, &n); 513 } 514 if (args_read != 1) { 515 return false; 516 } 517 while (*s != '\0' && (isdigit(*s) || (is_hex && isxdigit(*s)))) { 518 s++; 519 } 520 // 4705540: illegal if more characters are found after the first non-digit 521 if (strlen(s) > 1) { 522 return false; 523 } 524 switch (*s) { 525 case 'T': case 't': 526 *result = n * G * K; 527 // Check for overflow. 528 if (*result/((julong)G * K) != n) return false; 529 return true; 530 case 'G': case 'g': 531 *result = n * G; 532 if (*result/G != n) return false; 533 return true; 534 case 'M': case 'm': 535 *result = n * M; 536 if (*result/M != n) return false; 537 return true; 538 case 'K': case 'k': 539 *result = n * K; 540 if (*result/K != n) return false; 541 return true; 542 case '\0': 543 *result = n; 544 return true; 545 default: 546 return false; 547 } 548 } 549 550 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 551 if (size < min_size) return arg_too_small; 552 // Check that size will fit in a size_t (only relevant on 32-bit) 553 if (size > max_uintx) return arg_too_big; 554 return arg_in_range; 555 } 556 557 // Describe an argument out of range error 558 void Arguments::describe_range_error(ArgsRange errcode) { 559 switch(errcode) { 560 case arg_too_big: 561 jio_fprintf(defaultStream::error_stream(), 562 "The specified size exceeds the maximum " 563 "representable size.\n"); 564 break; 565 case arg_too_small: 566 case arg_unreadable: 567 case arg_in_range: 568 // do nothing for now 569 break; 570 default: 571 ShouldNotReachHere(); 572 } 573 } 574 575 static bool set_bool_flag(char* name, bool value, Flag::Flags origin) { 576 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 577 return true; 578 } else { 579 return false; 580 } 581 } 582 583 static bool set_fp_numeric_flag(char* name, char* value, Flag::Flags origin) { 584 double v; 585 if (sscanf(value, "%lf", &v) != 1) { 586 return false; 587 } 588 589 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 590 return true; 591 } 592 return false; 593 } 594 595 static bool set_numeric_flag(char* name, char* value, Flag::Flags origin) { 596 julong v; 597 int int_v; 598 intx intx_v; 599 bool is_neg = false; 600 // Check the sign first since atomull() parses only unsigned values. 601 if (*value == '-') { 602 if ((CommandLineFlags::intxAt(name, &intx_v) != Flag::SUCCESS) && (CommandLineFlags::intAt(name, &int_v) != Flag::SUCCESS)) { 603 return false; 604 } 605 value++; 606 is_neg = true; 607 } 608 if (!atomull(value, &v)) { 609 return false; 610 } 611 int_v = (int) v; 612 if (is_neg) { 613 int_v = -int_v; 614 } 615 if (CommandLineFlags::intAtPut(name, &int_v, origin) == Flag::SUCCESS) { 616 return true; 617 } 618 uint uint_v = (uint) v; 619 if (!is_neg && CommandLineFlags::uintAtPut(name, &uint_v, origin) == Flag::SUCCESS) { 620 return true; 621 } 622 intx_v = (intx) v; 623 if (is_neg) { 624 intx_v = -intx_v; 625 } 626 if (CommandLineFlags::intxAtPut(name, &intx_v, origin) == Flag::SUCCESS) { 627 return true; 628 } 629 uintx uintx_v = (uintx) v; 630 if (!is_neg && (CommandLineFlags::uintxAtPut(name, &uintx_v, origin) == Flag::SUCCESS)) { 631 return true; 632 } 633 uint64_t uint64_t_v = (uint64_t) v; 634 if (!is_neg && (CommandLineFlags::uint64_tAtPut(name, &uint64_t_v, origin) == Flag::SUCCESS)) { 635 return true; 636 } 637 size_t size_t_v = (size_t) v; 638 if (!is_neg && (CommandLineFlags::size_tAtPut(name, &size_t_v, origin) == Flag::SUCCESS)) { 639 return true; 640 } 641 return false; 642 } 643 644 static bool set_string_flag(char* name, const char* value, Flag::Flags origin) { 645 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 646 // Contract: CommandLineFlags always returns a pointer that needs freeing. 647 FREE_C_HEAP_ARRAY(char, value); 648 return true; 649 } 650 651 static bool append_to_string_flag(char* name, const char* new_value, Flag::Flags origin) { 652 const char* old_value = ""; 653 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 654 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 655 size_t new_len = strlen(new_value); 656 const char* value; 657 char* free_this_too = NULL; 658 if (old_len == 0) { 659 value = new_value; 660 } else if (new_len == 0) { 661 value = old_value; 662 } else { 663 char* buf = NEW_C_HEAP_ARRAY(char, old_len + 1 + new_len + 1, mtInternal); 664 // each new setting adds another LINE to the switch: 665 sprintf(buf, "%s\n%s", old_value, new_value); 666 value = buf; 667 free_this_too = buf; 668 } 669 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 670 // CommandLineFlags always returns a pointer that needs freeing. 671 FREE_C_HEAP_ARRAY(char, value); 672 if (free_this_too != NULL) { 673 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 674 FREE_C_HEAP_ARRAY(char, free_this_too); 675 } 676 return true; 677 } 678 679 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 680 681 // range of acceptable characters spelled out for portability reasons 682 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 683 #define BUFLEN 255 684 char name[BUFLEN+1]; 685 char dummy; 686 687 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 688 return set_bool_flag(name, false, origin); 689 } 690 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 691 return set_bool_flag(name, true, origin); 692 } 693 694 char punct; 695 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 696 const char* value = strchr(arg, '=') + 1; 697 Flag* flag = Flag::find_flag(name, strlen(name)); 698 if (flag != NULL && flag->is_ccstr()) { 699 if (flag->ccstr_accumulates()) { 700 return append_to_string_flag(name, value, origin); 701 } else { 702 if (value[0] == '\0') { 703 value = NULL; 704 } 705 return set_string_flag(name, value, origin); 706 } 707 } 708 } 709 710 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 711 const char* value = strchr(arg, '=') + 1; 712 // -XX:Foo:=xxx will reset the string flag to the given value. 713 if (value[0] == '\0') { 714 value = NULL; 715 } 716 return set_string_flag(name, value, origin); 717 } 718 719 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.]" 720 #define SIGNED_NUMBER_RANGE "[-0123456789]" 721 #define NUMBER_RANGE "[0123456789]" 722 char value[BUFLEN + 1]; 723 char value2[BUFLEN + 1]; 724 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 725 // Looks like a floating-point number -- try again with more lenient format string 726 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 727 return set_fp_numeric_flag(name, value, origin); 728 } 729 } 730 731 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 732 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 733 return set_numeric_flag(name, value, origin); 734 } 735 736 return false; 737 } 738 739 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 740 assert(bldarray != NULL, "illegal argument"); 741 742 if (arg == NULL) { 743 return; 744 } 745 746 int new_count = *count + 1; 747 748 // expand the array and add arg to the last element 749 if (*bldarray == NULL) { 750 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtInternal); 751 } else { 752 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtInternal); 753 } 754 (*bldarray)[*count] = os::strdup_check_oom(arg); 755 *count = new_count; 756 } 757 758 void Arguments::build_jvm_args(const char* arg) { 759 add_string(&_jvm_args_array, &_num_jvm_args, arg); 760 } 761 762 void Arguments::build_jvm_flags(const char* arg) { 763 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 764 } 765 766 // utility function to return a string that concatenates all 767 // strings in a given char** array 768 const char* Arguments::build_resource_string(char** args, int count) { 769 if (args == NULL || count == 0) { 770 return NULL; 771 } 772 size_t length = strlen(args[0]) + 1; // add 1 for the null terminator 773 for (int i = 1; i < count; i++) { 774 length += strlen(args[i]) + 1; // add 1 for a space 775 } 776 char* s = NEW_RESOURCE_ARRAY(char, length); 777 strcpy(s, args[0]); 778 for (int j = 1; j < count; j++) { 779 strcat(s, " "); 780 strcat(s, args[j]); 781 } 782 return (const char*) s; 783 } 784 785 void Arguments::print_on(outputStream* st) { 786 st->print_cr("VM Arguments:"); 787 if (num_jvm_flags() > 0) { 788 st->print("jvm_flags: "); print_jvm_flags_on(st); 789 st->cr(); 790 } 791 if (num_jvm_args() > 0) { 792 st->print("jvm_args: "); print_jvm_args_on(st); 793 st->cr(); 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_summary_on(outputStream* st) { 804 // Print the command line. Environment variables that are helpful for 805 // reproducing the problem are written later in the hs_err file. 806 // flags are from setting file 807 if (num_jvm_flags() > 0) { 808 st->print_raw("Settings File: "); 809 print_jvm_flags_on(st); 810 st->cr(); 811 } 812 // args are the command line and environment variable arguments. 813 st->print_raw("Command Line: "); 814 if (num_jvm_args() > 0) { 815 print_jvm_args_on(st); 816 } 817 // this is the classfile and any arguments to the java program 818 if (java_command() != NULL) { 819 st->print("%s", java_command()); 820 } 821 st->cr(); 822 } 823 824 void Arguments::print_jvm_flags_on(outputStream* st) { 825 if (_num_jvm_flags > 0) { 826 for (int i=0; i < _num_jvm_flags; i++) { 827 st->print("%s ", _jvm_flags_array[i]); 828 } 829 } 830 } 831 832 void Arguments::print_jvm_args_on(outputStream* st) { 833 if (_num_jvm_args > 0) { 834 for (int i=0; i < _num_jvm_args; i++) { 835 st->print("%s ", _jvm_args_array[i]); 836 } 837 } 838 } 839 840 bool Arguments::process_argument(const char* arg, 841 jboolean ignore_unrecognized, Flag::Flags origin) { 842 843 JDK_Version since = JDK_Version(); 844 845 if (parse_argument(arg, origin) || ignore_unrecognized) { 846 return true; 847 } 848 849 // Determine if the flag has '+', '-', or '=' characters. 850 bool has_plus_minus = (*arg == '+' || *arg == '-'); 851 const char* const argname = has_plus_minus ? arg + 1 : arg; 852 853 size_t arg_len; 854 const char* equal_sign = strchr(argname, '='); 855 if (equal_sign == NULL) { 856 arg_len = strlen(argname); 857 } else { 858 arg_len = equal_sign - argname; 859 } 860 861 // Only make the obsolete check for valid arguments. 862 if (arg_len <= BUFLEN) { 863 // Construct a string which consists only of the argument name without '+', '-', or '='. 864 char stripped_argname[BUFLEN+1]; 865 strncpy(stripped_argname, argname, arg_len); 866 stripped_argname[arg_len] = '\0'; // strncpy may not null terminate. 867 868 if (is_newly_obsolete(stripped_argname, &since)) { 869 char version[256]; 870 since.to_string(version, sizeof(version)); 871 warning("ignoring option %s; support was removed in %s", stripped_argname, version); 872 return true; 873 } 874 } 875 876 // For locked flags, report a custom error message if available. 877 // Otherwise, report the standard unrecognized VM option. 878 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 879 if (found_flag != NULL) { 880 char locked_message_buf[BUFLEN]; 881 found_flag->get_locked_message(locked_message_buf, BUFLEN); 882 if (strlen(locked_message_buf) == 0) { 883 if (found_flag->is_bool() && !has_plus_minus) { 884 jio_fprintf(defaultStream::error_stream(), 885 "Missing +/- setting for VM option '%s'\n", argname); 886 } else if (!found_flag->is_bool() && has_plus_minus) { 887 jio_fprintf(defaultStream::error_stream(), 888 "Unexpected +/- setting in VM option '%s'\n", argname); 889 } else { 890 jio_fprintf(defaultStream::error_stream(), 891 "Improperly specified VM option '%s'\n", argname); 892 } 893 } else { 894 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 895 } 896 } else { 897 jio_fprintf(defaultStream::error_stream(), 898 "Unrecognized VM option '%s'\n", argname); 899 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 900 if (fuzzy_matched != NULL) { 901 jio_fprintf(defaultStream::error_stream(), 902 "Did you mean '%s%s%s'? ", 903 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 904 fuzzy_matched->_name, 905 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 906 } 907 } 908 909 // allow for commandline "commenting out" options like -XX:#+Verbose 910 return arg[0] == '#'; 911 } 912 913 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 914 FILE* stream = fopen(file_name, "rb"); 915 if (stream == NULL) { 916 if (should_exist) { 917 jio_fprintf(defaultStream::error_stream(), 918 "Could not open settings file %s\n", file_name); 919 return false; 920 } else { 921 return true; 922 } 923 } 924 925 char token[1024]; 926 int pos = 0; 927 928 bool in_white_space = true; 929 bool in_comment = false; 930 bool in_quote = false; 931 char quote_c = 0; 932 bool result = true; 933 934 int c = getc(stream); 935 while(c != EOF && pos < (int)(sizeof(token)-1)) { 936 if (in_white_space) { 937 if (in_comment) { 938 if (c == '\n') in_comment = false; 939 } else { 940 if (c == '#') in_comment = true; 941 else if (!isspace(c)) { 942 in_white_space = false; 943 token[pos++] = c; 944 } 945 } 946 } else { 947 if (c == '\n' || (!in_quote && isspace(c))) { 948 // token ends at newline, or at unquoted whitespace 949 // this allows a way to include spaces in string-valued options 950 token[pos] = '\0'; 951 logOption(token); 952 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 953 build_jvm_flags(token); 954 pos = 0; 955 in_white_space = true; 956 in_quote = false; 957 } else if (!in_quote && (c == '\'' || c == '"')) { 958 in_quote = true; 959 quote_c = c; 960 } else if (in_quote && (c == quote_c)) { 961 in_quote = false; 962 } else { 963 token[pos++] = c; 964 } 965 } 966 c = getc(stream); 967 } 968 if (pos > 0) { 969 token[pos] = '\0'; 970 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 971 build_jvm_flags(token); 972 } 973 fclose(stream); 974 return result; 975 } 976 977 //============================================================================================================= 978 // Parsing of properties (-D) 979 980 const char* Arguments::get_property(const char* key) { 981 return PropertyList_get_value(system_properties(), key); 982 } 983 984 bool Arguments::add_property(const char* prop) { 985 const char* eq = strchr(prop, '='); 986 const char* key; 987 const char* value = ""; 988 989 if (eq == NULL) { 990 // property doesn't have a value, thus use passed string 991 key = prop; 992 } else { 993 // property have a value, thus extract it and save to the 994 // allocated string 995 size_t key_len = eq - prop; 996 char* tmp_key = AllocateHeap(key_len + 1, mtInternal); 997 998 strncpy(tmp_key, prop, key_len); 999 tmp_key[key_len] = '\0'; 1000 key = tmp_key; 1001 1002 value = &prop[key_len + 1]; 1003 } 1004 1005 if (strcmp(key, "java.compiler") == 0) { 1006 process_java_compiler_argument(value); 1007 // Record value in Arguments, but let it get passed to Java. 1008 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1009 strcmp(key, "sun.java.launcher.pid") == 0) { 1010 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1011 // private and are processed in process_sun_java_launcher_properties(); 1012 // the sun.java.launcher property is passed on to the java application 1013 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1014 PropertyList_unique_add(&_system_properties, key, value, true); 1015 } else { 1016 if (strcmp(key, "sun.java.command") == 0) { 1017 if (_java_command != NULL) { 1018 os::free(_java_command); 1019 } 1020 _java_command = os::strdup_check_oom(value, mtInternal); 1021 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1022 if (_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1023 assert(_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1024 os::free((void *)_java_vendor_url_bug); 1025 } 1026 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1027 // its value without going through the property list or making a Java call. 1028 _java_vendor_url_bug = os::strdup_check_oom(value, mtInternal); 1029 } 1030 1031 // Create new property and add at the end of the list 1032 PropertyList_unique_add(&_system_properties, key, value); 1033 } 1034 1035 if (key != prop) { 1036 // SystemProperty copy passed value, thus free previously allocated 1037 // memory 1038 FreeHeap((void *)key); 1039 } 1040 1041 return true; 1042 } 1043 1044 //=========================================================================================================== 1045 // Setting int/mixed/comp mode flags 1046 1047 void Arguments::set_mode_flags(Mode mode) { 1048 // Set up default values for all flags. 1049 // If you add a flag to any of the branches below, 1050 // add a default value for it here. 1051 set_java_compiler(false); 1052 _mode = mode; 1053 1054 // Ensure Agent_OnLoad has the correct initial values. 1055 // This may not be the final mode; mode may change later in onload phase. 1056 PropertyList_unique_add(&_system_properties, "java.vm.info", 1057 VM_Version::vm_info_string(), false); 1058 1059 UseInterpreter = true; 1060 UseCompiler = true; 1061 UseLoopCounter = true; 1062 1063 // Default values may be platform/compiler dependent - 1064 // use the saved values 1065 ClipInlining = Arguments::_ClipInlining; 1066 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1067 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1068 BackgroundCompilation = Arguments::_BackgroundCompilation; 1069 if (TieredCompilation) { 1070 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1071 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1072 } 1073 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1074 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1075 } 1076 } 1077 1078 // Change from defaults based on mode 1079 switch (mode) { 1080 default: 1081 ShouldNotReachHere(); 1082 break; 1083 case _int: 1084 UseCompiler = false; 1085 UseLoopCounter = false; 1086 AlwaysCompileLoopMethods = false; 1087 UseOnStackReplacement = false; 1088 break; 1089 case _mixed: 1090 // same as default 1091 break; 1092 case _comp: 1093 UseInterpreter = false; 1094 BackgroundCompilation = false; 1095 ClipInlining = false; 1096 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1097 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1098 // compile a level 4 (C2) and then continue executing it. 1099 if (TieredCompilation) { 1100 Tier3InvokeNotifyFreqLog = 0; 1101 Tier4InvocationThreshold = 0; 1102 } 1103 break; 1104 } 1105 } 1106 1107 #if defined(COMPILER2) || defined(_LP64) || !INCLUDE_CDS 1108 // Conflict: required to use shared spaces (-Xshare:on), but 1109 // incompatible command line options were chosen. 1110 1111 static void no_shared_spaces(const char* message) { 1112 if (RequireSharedSpaces) { 1113 jio_fprintf(defaultStream::error_stream(), 1114 "Class data sharing is inconsistent with other specified options.\n"); 1115 vm_exit_during_initialization("Unable to use shared archive.", message); 1116 } else { 1117 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1118 } 1119 } 1120 #endif 1121 1122 // Returns threshold scaled with the value of scale. 1123 // If scale < 0.0, threshold is returned without scaling. 1124 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1125 if (scale == 1.0 || scale < 0.0) { 1126 return threshold; 1127 } else { 1128 return (intx)(threshold * scale); 1129 } 1130 } 1131 1132 // Returns freq_log scaled with the value of scale. 1133 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1134 // If scale < 0.0, freq_log is returned without scaling. 1135 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1136 // Check if scaling is necessary or if negative value was specified. 1137 if (scale == 1.0 || scale < 0.0) { 1138 return freq_log; 1139 } 1140 // Check values to avoid calculating log2 of 0. 1141 if (scale == 0.0 || freq_log == 0) { 1142 return 0; 1143 } 1144 // Determine the maximum notification frequency value currently supported. 1145 // The largest mask value that the interpreter/C1 can handle is 1146 // of length InvocationCounter::number_of_count_bits. Mask values are always 1147 // one bit shorter then the value of the notification frequency. Set 1148 // max_freq_bits accordingly. 1149 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1150 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1151 if (scaled_freq == 0) { 1152 // Return 0 right away to avoid calculating log2 of 0. 1153 return 0; 1154 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1155 return max_freq_bits; 1156 } else { 1157 return log2_intptr(scaled_freq); 1158 } 1159 } 1160 1161 void Arguments::set_tiered_flags() { 1162 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1163 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1164 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1165 } 1166 if (CompilationPolicyChoice < 2) { 1167 vm_exit_during_initialization( 1168 "Incompatible compilation policy selected", NULL); 1169 } 1170 // Increase the code cache size - tiered compiles a lot more. 1171 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1172 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1173 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1174 } 1175 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1176 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1177 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1178 1179 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1180 // Multiply sizes by 5 but fix NonNMethodCodeHeapSize (distribute among non-profiled and profiled code heap) 1181 if (FLAG_IS_DEFAULT(ProfiledCodeHeapSize)) { 1182 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, ProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1183 } 1184 if (FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) { 1185 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, NonProfiledCodeHeapSize * 5 + NonNMethodCodeHeapSize * 2); 1186 } 1187 // Check consistency of code heap sizes 1188 if ((NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 1189 jio_fprintf(defaultStream::error_stream(), 1190 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 1191 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 1192 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 1193 vm_exit(1); 1194 } 1195 } 1196 } 1197 if (!UseInterpreter) { // -Xcomp 1198 Tier3InvokeNotifyFreqLog = 0; 1199 Tier4InvocationThreshold = 0; 1200 } 1201 1202 if (CompileThresholdScaling < 0) { 1203 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1204 } 1205 1206 // Scale tiered compilation thresholds. 1207 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1208 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1209 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1210 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1211 1212 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1213 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1214 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1215 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1216 1217 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1218 // once these thresholds become supported. 1219 1220 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1221 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1222 1223 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1224 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1225 1226 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1227 1228 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1229 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1230 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1231 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1232 } 1233 } 1234 1235 #if INCLUDE_ALL_GCS 1236 static void disable_adaptive_size_policy(const char* collector_name) { 1237 if (UseAdaptiveSizePolicy) { 1238 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1239 warning("disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1240 collector_name); 1241 } 1242 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1243 } 1244 } 1245 1246 void Arguments::set_parnew_gc_flags() { 1247 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1248 "control point invariant"); 1249 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1250 assert(UseParNewGC, "ParNew should always be used with CMS"); 1251 1252 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1253 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1254 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1255 } else if (ParallelGCThreads == 0) { 1256 jio_fprintf(defaultStream::error_stream(), 1257 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1258 vm_exit(1); 1259 } 1260 1261 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1262 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1263 // we set them to 1024 and 1024. 1264 // See CR 6362902. 1265 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1266 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1267 } 1268 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1269 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1270 } 1271 1272 // When using compressed oops, we use local overflow stacks, 1273 // rather than using a global overflow list chained through 1274 // the klass word of the object's pre-image. 1275 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1276 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1277 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1278 } 1279 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1280 } 1281 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1282 } 1283 1284 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1285 // sparc/solaris for certain applications, but would gain from 1286 // further optimization and tuning efforts, and would almost 1287 // certainly gain from analysis of platform and environment. 1288 void Arguments::set_cms_and_parnew_gc_flags() { 1289 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1290 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1291 assert(UseParNewGC, "ParNew should always be used with CMS"); 1292 1293 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1294 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1295 1296 set_parnew_gc_flags(); 1297 1298 size_t max_heap = align_size_down(MaxHeapSize, 1299 CardTableRS::ct_max_alignment_constraint()); 1300 1301 // Now make adjustments for CMS 1302 intx tenuring_default = (intx)6; 1303 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1304 1305 // Preferred young gen size for "short" pauses: 1306 // upper bound depends on # of threads and NewRatio. 1307 const size_t preferred_max_new_size_unaligned = 1308 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1309 size_t preferred_max_new_size = 1310 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1311 1312 // Unless explicitly requested otherwise, size young gen 1313 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1314 1315 // If either MaxNewSize or NewRatio is set on the command line, 1316 // assume the user is trying to set the size of the young gen. 1317 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1318 1319 // Set MaxNewSize to our calculated preferred_max_new_size unless 1320 // NewSize was set on the command line and it is larger than 1321 // preferred_max_new_size. 1322 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1323 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1324 } else { 1325 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1326 } 1327 if (PrintGCDetails && Verbose) { 1328 // Too early to use gclog_or_tty 1329 tty->print_cr("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1330 } 1331 1332 // Code along this path potentially sets NewSize and OldSize 1333 if (PrintGCDetails && Verbose) { 1334 // Too early to use gclog_or_tty 1335 tty->print_cr("CMS set min_heap_size: " SIZE_FORMAT 1336 " initial_heap_size: " SIZE_FORMAT 1337 " max_heap: " SIZE_FORMAT, 1338 min_heap_size(), InitialHeapSize, max_heap); 1339 } 1340 size_t min_new = preferred_max_new_size; 1341 if (FLAG_IS_CMDLINE(NewSize)) { 1342 min_new = NewSize; 1343 } 1344 if (max_heap > min_new && min_heap_size() > min_new) { 1345 // Unless explicitly requested otherwise, make young gen 1346 // at least min_new, and at most preferred_max_new_size. 1347 if (FLAG_IS_DEFAULT(NewSize)) { 1348 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1349 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1350 if (PrintGCDetails && Verbose) { 1351 // Too early to use gclog_or_tty 1352 tty->print_cr("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1353 } 1354 } 1355 // Unless explicitly requested otherwise, size old gen 1356 // so it's NewRatio x of NewSize. 1357 if (FLAG_IS_DEFAULT(OldSize)) { 1358 if (max_heap > NewSize) { 1359 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1360 if (PrintGCDetails && Verbose) { 1361 // Too early to use gclog_or_tty 1362 tty->print_cr("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1363 } 1364 } 1365 } 1366 } 1367 } 1368 // Unless explicitly requested otherwise, definitely 1369 // promote all objects surviving "tenuring_default" scavenges. 1370 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1371 FLAG_IS_DEFAULT(SurvivorRatio)) { 1372 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1373 } 1374 // If we decided above (or user explicitly requested) 1375 // `promote all' (via MaxTenuringThreshold := 0), 1376 // prefer minuscule survivor spaces so as not to waste 1377 // space for (non-existent) survivors 1378 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1379 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1380 } 1381 1382 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1383 // but rather the number of free blocks of a given size that are used when 1384 // replenishing the local per-worker free list caches. 1385 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1386 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1387 // OldPLAB sizing manually turned off: Use a larger default setting, 1388 // unless it was manually specified. This is because a too-low value 1389 // will slow down scavenges. 1390 FLAG_SET_ERGO(size_t, OldPLABSize, CFLS_LAB::_default_static_old_plab_size); // default value before 6631166 1391 } else { 1392 FLAG_SET_DEFAULT(OldPLABSize, CFLS_LAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1393 } 1394 } 1395 1396 // If either of the static initialization defaults have changed, note this 1397 // modification. 1398 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1399 CFLS_LAB::modify_initialization(OldPLABSize, OldPLABWeight); 1400 } 1401 1402 if (!ClassUnloading) { 1403 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 1404 FLAG_SET_CMDLINE(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false); 1405 } 1406 1407 if (PrintGCDetails && Verbose) { 1408 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1409 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1410 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1411 } 1412 } 1413 #endif // INCLUDE_ALL_GCS 1414 1415 void set_object_alignment() { 1416 // Object alignment. 1417 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1418 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1419 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1420 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1421 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1422 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1423 1424 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1425 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1426 1427 // Oop encoding heap max 1428 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1429 1430 if (SurvivorAlignmentInBytes == 0) { 1431 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1432 } 1433 1434 #if INCLUDE_ALL_GCS 1435 // Set CMS global values 1436 CompactibleFreeListSpace::set_cms_values(); 1437 #endif // INCLUDE_ALL_GCS 1438 } 1439 1440 size_t Arguments::max_heap_for_compressed_oops() { 1441 // Avoid sign flip. 1442 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1443 // We need to fit both the NULL page and the heap into the memory budget, while 1444 // keeping alignment constraints of the heap. To guarantee the latter, as the 1445 // NULL page is located before the heap, we pad the NULL page to the conservative 1446 // maximum alignment that the GC may ever impose upon the heap. 1447 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1448 _conservative_max_heap_alignment); 1449 1450 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1451 NOT_LP64(ShouldNotReachHere(); return 0); 1452 } 1453 1454 bool Arguments::should_auto_select_low_pause_collector() { 1455 if (UseAutoGCSelectPolicy && 1456 !FLAG_IS_DEFAULT(MaxGCPauseMillis) && 1457 (MaxGCPauseMillis <= AutoGCSelectPauseMillis)) { 1458 if (PrintGCDetails) { 1459 // Cannot use gclog_or_tty yet. 1460 tty->print_cr("Automatic selection of the low pause collector" 1461 " based on pause goal of %d (ms)", (int) MaxGCPauseMillis); 1462 } 1463 return true; 1464 } 1465 return false; 1466 } 1467 1468 void Arguments::set_use_compressed_oops() { 1469 #ifndef ZERO 1470 #ifdef _LP64 1471 // MaxHeapSize is not set up properly at this point, but 1472 // the only value that can override MaxHeapSize if we are 1473 // to use UseCompressedOops is InitialHeapSize. 1474 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1475 1476 if (max_heap_size <= max_heap_for_compressed_oops()) { 1477 #if !defined(COMPILER1) || defined(TIERED) 1478 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1479 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1480 } 1481 #endif 1482 } else { 1483 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1484 warning("Max heap size too large for Compressed Oops"); 1485 FLAG_SET_DEFAULT(UseCompressedOops, false); 1486 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1487 } 1488 } 1489 #endif // _LP64 1490 #endif // ZERO 1491 } 1492 1493 1494 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1495 // set_use_compressed_oops(). 1496 void Arguments::set_use_compressed_klass_ptrs() { 1497 #ifndef ZERO 1498 #ifdef _LP64 1499 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1500 if (!UseCompressedOops) { 1501 if (UseCompressedClassPointers) { 1502 warning("UseCompressedClassPointers requires UseCompressedOops"); 1503 } 1504 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1505 } else { 1506 // Turn on UseCompressedClassPointers too 1507 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1508 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1509 } 1510 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1511 if (UseCompressedClassPointers) { 1512 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1513 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1514 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1515 } 1516 } 1517 } 1518 #endif // _LP64 1519 #endif // !ZERO 1520 } 1521 1522 void Arguments::set_conservative_max_heap_alignment() { 1523 // The conservative maximum required alignment for the heap is the maximum of 1524 // the alignments imposed by several sources: any requirements from the heap 1525 // itself, the collector policy and the maximum page size we may run the VM 1526 // with. 1527 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1528 #if INCLUDE_ALL_GCS 1529 if (UseParallelGC) { 1530 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1531 } else if (UseG1GC) { 1532 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1533 } 1534 #endif // INCLUDE_ALL_GCS 1535 _conservative_max_heap_alignment = MAX4(heap_alignment, 1536 (size_t)os::vm_allocation_granularity(), 1537 os::max_page_size(), 1538 CollectorPolicy::compute_heap_alignment()); 1539 } 1540 1541 void Arguments::select_gc_ergonomically() { 1542 if (os::is_server_class_machine()) { 1543 if (should_auto_select_low_pause_collector()) { 1544 FLAG_SET_ERGO(bool, UseConcMarkSweepGC, true); 1545 } else { 1546 #if defined(JAVASE_EMBEDDED) 1547 FLAG_SET_ERGO(bool, UseParallelGC, true); 1548 #else 1549 FLAG_SET_ERGO(bool, UseG1GC, true); 1550 #endif 1551 } 1552 } else { 1553 FLAG_SET_ERGO(bool, UseSerialGC, true); 1554 } 1555 } 1556 1557 void Arguments::select_gc() { 1558 if (!gc_selected()) { 1559 select_gc_ergonomically(); 1560 guarantee(gc_selected(), "No GC selected"); 1561 } 1562 } 1563 1564 void Arguments::set_ergonomics_flags() { 1565 select_gc(); 1566 1567 #ifdef COMPILER2 1568 // Shared spaces work fine with other GCs but causes bytecode rewriting 1569 // to be disabled, which hurts interpreter performance and decreases 1570 // server performance. When -server is specified, keep the default off 1571 // unless it is asked for. Future work: either add bytecode rewriting 1572 // at link time, or rewrite bytecodes in non-shared methods. 1573 if (!DumpSharedSpaces && !RequireSharedSpaces && 1574 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1575 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1576 } 1577 #endif 1578 1579 set_conservative_max_heap_alignment(); 1580 1581 #ifndef ZERO 1582 #ifdef _LP64 1583 set_use_compressed_oops(); 1584 1585 // set_use_compressed_klass_ptrs() must be called after calling 1586 // set_use_compressed_oops(). 1587 set_use_compressed_klass_ptrs(); 1588 1589 // Also checks that certain machines are slower with compressed oops 1590 // in vm_version initialization code. 1591 #endif // _LP64 1592 #endif // !ZERO 1593 1594 // Set up runtime image flags. 1595 set_runtime_image_flags(); 1596 1597 CodeCacheExtensions::set_ergonomics_flags(); 1598 } 1599 1600 void Arguments::set_parallel_gc_flags() { 1601 assert(UseParallelGC || UseParallelOldGC, "Error"); 1602 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1603 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1604 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1605 } 1606 FLAG_SET_DEFAULT(UseParallelGC, true); 1607 1608 // If no heap maximum was requested explicitly, use some reasonable fraction 1609 // of the physical memory, up to a maximum of 1GB. 1610 FLAG_SET_DEFAULT(ParallelGCThreads, 1611 Abstract_VM_Version::parallel_worker_threads()); 1612 if (ParallelGCThreads == 0) { 1613 jio_fprintf(defaultStream::error_stream(), 1614 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1615 vm_exit(1); 1616 } 1617 1618 if (UseAdaptiveSizePolicy) { 1619 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1620 // unless the user actually sets these flags. 1621 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1622 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1623 } 1624 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1625 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1626 } 1627 } 1628 1629 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1630 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1631 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1632 // See CR 6362902 for details. 1633 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1634 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1635 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1636 } 1637 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1638 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1639 } 1640 } 1641 1642 if (UseParallelOldGC) { 1643 // Par compact uses lower default values since they are treated as 1644 // minimums. These are different defaults because of the different 1645 // interpretation and are not ergonomically set. 1646 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1647 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1648 } 1649 } 1650 } 1651 1652 void Arguments::set_g1_gc_flags() { 1653 assert(UseG1GC, "Error"); 1654 #ifdef COMPILER1 1655 FastTLABRefill = false; 1656 #endif 1657 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1658 if (ParallelGCThreads == 0) { 1659 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1660 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1661 } 1662 1663 #if INCLUDE_ALL_GCS 1664 if (G1ConcRefinementThreads == 0) { 1665 FLAG_SET_DEFAULT(G1ConcRefinementThreads, ParallelGCThreads); 1666 } 1667 #endif 1668 1669 // MarkStackSize will be set (if it hasn't been set by the user) 1670 // when concurrent marking is initialized. 1671 // Its value will be based upon the number of parallel marking threads. 1672 // But we do set the maximum mark stack size here. 1673 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1674 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1675 } 1676 1677 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1678 // In G1, we want the default GC overhead goal to be higher than 1679 // say in PS. So we set it here to 10%. Otherwise the heap might 1680 // be expanded more aggressively than we would like it to. In 1681 // fact, even 10% seems to not be high enough in some cases 1682 // (especially small GC stress tests that the main thing they do 1683 // is allocation). We might consider increase it further. 1684 FLAG_SET_DEFAULT(GCTimeRatio, 9); 1685 } 1686 1687 if (PrintGCDetails && Verbose) { 1688 tty->print_cr("MarkStackSize: %uk MarkStackSizeMax: %uk", 1689 (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1690 tty->print_cr("ConcGCThreads: %u", ConcGCThreads); 1691 } 1692 } 1693 1694 #if !INCLUDE_ALL_GCS 1695 #ifdef ASSERT 1696 static bool verify_serial_gc_flags() { 1697 return (UseSerialGC && 1698 !(UseParNewGC || (UseConcMarkSweepGC) || UseG1GC || 1699 UseParallelGC || UseParallelOldGC)); 1700 } 1701 #endif // ASSERT 1702 #endif // INCLUDE_ALL_GCS 1703 1704 void Arguments::set_gc_specific_flags() { 1705 #if INCLUDE_ALL_GCS 1706 // Set per-collector flags 1707 if (UseParallelGC || UseParallelOldGC) { 1708 set_parallel_gc_flags(); 1709 } else if (UseConcMarkSweepGC) { 1710 set_cms_and_parnew_gc_flags(); 1711 } else if (UseG1GC) { 1712 set_g1_gc_flags(); 1713 } 1714 check_deprecated_gc_flags(); 1715 if (AssumeMP && !UseSerialGC) { 1716 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 1717 warning("If the number of processors is expected to increase from one, then" 1718 " you should configure the number of parallel GC threads appropriately" 1719 " using -XX:ParallelGCThreads=N"); 1720 } 1721 } 1722 if (MinHeapFreeRatio == 100) { 1723 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 1724 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 1725 } 1726 #else // INCLUDE_ALL_GCS 1727 assert(verify_serial_gc_flags(), "SerialGC unset"); 1728 #endif // INCLUDE_ALL_GCS 1729 } 1730 1731 julong Arguments::limit_by_allocatable_memory(julong limit) { 1732 julong max_allocatable; 1733 julong result = limit; 1734 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1735 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1736 } 1737 return result; 1738 } 1739 1740 // Use static initialization to get the default before parsing 1741 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1742 1743 void Arguments::set_heap_size() { 1744 if (!FLAG_IS_DEFAULT(DefaultMaxRAMFraction)) { 1745 // Deprecated flag 1746 FLAG_SET_CMDLINE(uintx, MaxRAMFraction, DefaultMaxRAMFraction); 1747 } 1748 1749 const julong phys_mem = 1750 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1751 : (julong)MaxRAM; 1752 1753 // If the maximum heap size has not been set with -Xmx, 1754 // then set it as fraction of the size of physical memory, 1755 // respecting the maximum and minimum sizes of the heap. 1756 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1757 julong reasonable_max = phys_mem / MaxRAMFraction; 1758 1759 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 1760 // Small physical memory, so use a minimum fraction of it for the heap 1761 reasonable_max = phys_mem / MinRAMFraction; 1762 } else { 1763 // Not-small physical memory, so require a heap at least 1764 // as large as MaxHeapSize 1765 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1766 } 1767 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1768 // Limit the heap size to ErgoHeapSizeLimit 1769 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1770 } 1771 if (UseCompressedOops) { 1772 // Limit the heap size to the maximum possible when using compressed oops 1773 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1774 1775 // HeapBaseMinAddress can be greater than default but not less than. 1776 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1777 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1778 // matches compressed oops printing flags 1779 if (PrintCompressedOopsMode || (PrintMiscellaneous && Verbose)) { 1780 jio_fprintf(defaultStream::error_stream(), 1781 "HeapBaseMinAddress must be at least " SIZE_FORMAT 1782 " (" SIZE_FORMAT "G) which is greater than value given " 1783 SIZE_FORMAT "\n", 1784 DefaultHeapBaseMinAddress, 1785 DefaultHeapBaseMinAddress/G, 1786 HeapBaseMinAddress); 1787 } 1788 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1789 } 1790 } 1791 1792 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1793 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1794 // but it should be not less than default MaxHeapSize. 1795 max_coop_heap -= HeapBaseMinAddress; 1796 } 1797 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1798 } 1799 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1800 1801 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1802 // An initial heap size was specified on the command line, 1803 // so be sure that the maximum size is consistent. Done 1804 // after call to limit_by_allocatable_memory because that 1805 // method might reduce the allocation size. 1806 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1807 } 1808 1809 if (PrintGCDetails && Verbose) { 1810 // Cannot use gclog_or_tty yet. 1811 tty->print_cr(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1812 } 1813 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1814 } 1815 1816 // If the minimum or initial heap_size have not been set or requested to be set 1817 // ergonomically, set them accordingly. 1818 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1819 julong reasonable_minimum = (julong)(OldSize + NewSize); 1820 1821 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1822 1823 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1824 1825 if (InitialHeapSize == 0) { 1826 julong reasonable_initial = phys_mem / InitialRAMFraction; 1827 1828 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1829 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1830 1831 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1832 1833 if (PrintGCDetails && Verbose) { 1834 // Cannot use gclog_or_tty yet. 1835 tty->print_cr(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1836 } 1837 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1838 } 1839 // If the minimum heap size has not been set (via -Xms), 1840 // synchronize with InitialHeapSize to avoid errors with the default value. 1841 if (min_heap_size() == 0) { 1842 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1843 if (PrintGCDetails && Verbose) { 1844 // Cannot use gclog_or_tty yet. 1845 tty->print_cr(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1846 } 1847 } 1848 } 1849 } 1850 1851 // Set up runtime image flags 1852 void Arguments::set_runtime_image_flags() { 1853 #ifdef _LP64 1854 // Memory map image file by default on 64 bit machines. 1855 if (FLAG_IS_DEFAULT(MemoryMapImage)) { 1856 FLAG_SET_ERGO(bool, MemoryMapImage, true); 1857 } 1858 #endif 1859 } 1860 1861 // This must be called after ergonomics. 1862 void Arguments::set_bytecode_flags() { 1863 if (!RewriteBytecodes) { 1864 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1865 } 1866 } 1867 1868 // Aggressive optimization flags -XX:+AggressiveOpts 1869 jint Arguments::set_aggressive_opts_flags() { 1870 #ifdef COMPILER2 1871 if (AggressiveUnboxing) { 1872 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1873 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1874 } else if (!EliminateAutoBox) { 1875 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1876 AggressiveUnboxing = false; 1877 } 1878 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1879 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1880 } else if (!DoEscapeAnalysis) { 1881 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1882 AggressiveUnboxing = false; 1883 } 1884 } 1885 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1886 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1887 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1888 } 1889 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1890 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1891 } 1892 1893 // Feed the cache size setting into the JDK 1894 char buffer[1024]; 1895 sprintf(buffer, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1896 if (!add_property(buffer)) { 1897 return JNI_ENOMEM; 1898 } 1899 } 1900 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1901 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1902 } 1903 #endif 1904 1905 if (AggressiveOpts) { 1906 // Sample flag setting code 1907 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1908 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1909 // } 1910 } 1911 1912 return JNI_OK; 1913 } 1914 1915 //=========================================================================================================== 1916 // Parsing of java.compiler property 1917 1918 void Arguments::process_java_compiler_argument(const char* arg) { 1919 // For backwards compatibility, Djava.compiler=NONE or "" 1920 // causes us to switch to -Xint mode UNLESS -Xdebug 1921 // is also specified. 1922 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1923 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1924 } 1925 } 1926 1927 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1928 _sun_java_launcher = os::strdup_check_oom(launcher); 1929 } 1930 1931 bool Arguments::created_by_java_launcher() { 1932 assert(_sun_java_launcher != NULL, "property must have value"); 1933 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1934 } 1935 1936 bool Arguments::sun_java_launcher_is_altjvm() { 1937 return _sun_java_launcher_is_altjvm; 1938 } 1939 1940 //=========================================================================================================== 1941 // Parsing of main arguments 1942 1943 // check if do gclog rotation 1944 // +UseGCLogFileRotation is a must, 1945 // no gc log rotation when log file not supplied or 1946 // NumberOfGCLogFiles is 0 1947 void check_gclog_consistency() { 1948 if (UseGCLogFileRotation) { 1949 if ((Arguments::gc_log_filename() == NULL) || (NumberOfGCLogFiles == 0)) { 1950 jio_fprintf(defaultStream::output_stream(), 1951 "To enable GC log rotation, use -Xloggc:<filename> -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=<num_of_files>\n" 1952 "where num_of_file > 0\n" 1953 "GC log rotation is turned off\n"); 1954 UseGCLogFileRotation = false; 1955 } 1956 } 1957 1958 if (UseGCLogFileRotation && (GCLogFileSize != 0) && (GCLogFileSize < 8*K)) { 1959 if (FLAG_SET_CMDLINE(size_t, GCLogFileSize, 8*K) == Flag::SUCCESS) { 1960 jio_fprintf(defaultStream::output_stream(), 1961 "GCLogFileSize changed to minimum 8K\n"); 1962 } 1963 } 1964 } 1965 1966 // This function is called for -Xloggc:<filename>, it can be used 1967 // to check if a given file name(or string) conforms to the following 1968 // specification: 1969 // A valid string only contains "[A-Z][a-z][0-9].-_%[p|t]" 1970 // %p and %t only allowed once. We only limit usage of filename not path 1971 bool is_filename_valid(const char *file_name) { 1972 const char* p = file_name; 1973 char file_sep = os::file_separator()[0]; 1974 const char* cp; 1975 // skip prefix path 1976 for (cp = file_name; *cp != '\0'; cp++) { 1977 if (*cp == '/' || *cp == file_sep) { 1978 p = cp + 1; 1979 } 1980 } 1981 1982 int count_p = 0; 1983 int count_t = 0; 1984 while (*p != '\0') { 1985 if ((*p >= '0' && *p <= '9') || 1986 (*p >= 'A' && *p <= 'Z') || 1987 (*p >= 'a' && *p <= 'z') || 1988 *p == '-' || 1989 *p == '_' || 1990 *p == '.') { 1991 p++; 1992 continue; 1993 } 1994 if (*p == '%') { 1995 if(*(p + 1) == 'p') { 1996 p += 2; 1997 count_p ++; 1998 continue; 1999 } 2000 if (*(p + 1) == 't') { 2001 p += 2; 2002 count_t ++; 2003 continue; 2004 } 2005 } 2006 return false; 2007 } 2008 return count_p < 2 && count_t < 2; 2009 } 2010 2011 // Check consistency of GC selection 2012 bool Arguments::check_gc_consistency() { 2013 check_gclog_consistency(); 2014 // Ensure that the user has not selected conflicting sets 2015 // of collectors. 2016 uint i = 0; 2017 if (UseSerialGC) i++; 2018 if (UseConcMarkSweepGC) i++; 2019 if (UseParallelGC || UseParallelOldGC) i++; 2020 if (UseG1GC) i++; 2021 if (i > 1) { 2022 jio_fprintf(defaultStream::error_stream(), 2023 "Conflicting collector combinations in option list; " 2024 "please refer to the release notes for the combinations " 2025 "allowed\n"); 2026 return false; 2027 } 2028 2029 if (UseConcMarkSweepGC && !UseParNewGC) { 2030 jio_fprintf(defaultStream::error_stream(), 2031 "It is not possible to combine the DefNew young collector with the CMS collector.\n"); 2032 return false; 2033 } 2034 2035 if (UseParNewGC && !UseConcMarkSweepGC) { 2036 jio_fprintf(defaultStream::error_stream(), 2037 "It is not possible to combine the ParNew young collector with any collector other than CMS.\n"); 2038 return false; 2039 } 2040 2041 return true; 2042 } 2043 2044 void Arguments::check_deprecated_gc_flags() { 2045 if (FLAG_IS_CMDLINE(UseParNewGC)) { 2046 warning("The UseParNewGC flag is deprecated and will likely be removed in a future release"); 2047 } 2048 if (FLAG_IS_CMDLINE(MaxGCMinorPauseMillis)) { 2049 warning("Using MaxGCMinorPauseMillis as minor pause goal is deprecated" 2050 "and will likely be removed in future release"); 2051 } 2052 if (FLAG_IS_CMDLINE(DefaultMaxRAMFraction)) { 2053 warning("DefaultMaxRAMFraction is deprecated and will likely be removed in a future release. " 2054 "Use MaxRAMFraction instead."); 2055 } 2056 } 2057 2058 // Check the consistency of vm_init_args 2059 bool Arguments::check_vm_args_consistency() { 2060 // Method for adding checks for flag consistency. 2061 // The intent is to warn the user of all possible conflicts, 2062 // before returning an error. 2063 // Note: Needs platform-dependent factoring. 2064 bool status = true; 2065 2066 if (TLABRefillWasteFraction == 0) { 2067 jio_fprintf(defaultStream::error_stream(), 2068 "TLABRefillWasteFraction should be a denominator, " 2069 "not " SIZE_FORMAT "\n", 2070 TLABRefillWasteFraction); 2071 status = false; 2072 } 2073 2074 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2075 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2076 } 2077 2078 if (UseParallelOldGC && ParallelOldGCSplitALot) { 2079 // Settings to encourage splitting. 2080 if (!FLAG_IS_CMDLINE(NewRatio)) { 2081 if (FLAG_SET_CMDLINE(uintx, NewRatio, 2) != Flag::SUCCESS) { 2082 status = false; 2083 } 2084 } 2085 if (!FLAG_IS_CMDLINE(ScavengeBeforeFullGC)) { 2086 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2087 status = false; 2088 } 2089 } 2090 } 2091 2092 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2093 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2094 } 2095 2096 if (GCTimeLimit == 100) { 2097 // Turn off gc-overhead-limit-exceeded checks 2098 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2099 } 2100 2101 status = status && check_gc_consistency(); 2102 2103 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2104 // insists that we hold the requisite locks so that the iteration is 2105 // MT-safe. For the verification at start-up and shut-down, we don't 2106 // yet have a good way of acquiring and releasing these locks, 2107 // which are not visible at the CollectedHeap level. We want to 2108 // be able to acquire these locks and then do the iteration rather 2109 // than just disable the lock verification. This will be fixed under 2110 // bug 4788986. 2111 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2112 if (VerifyDuringStartup) { 2113 warning("Heap verification at start-up disabled " 2114 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2115 VerifyDuringStartup = false; // Disable verification at start-up 2116 } 2117 2118 if (VerifyBeforeExit) { 2119 warning("Heap verification at shutdown disabled " 2120 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2121 VerifyBeforeExit = false; // Disable verification at shutdown 2122 } 2123 } 2124 2125 // Note: only executed in non-PRODUCT mode 2126 if (!UseAsyncConcMarkSweepGC && 2127 (ExplicitGCInvokesConcurrent || 2128 ExplicitGCInvokesConcurrentAndUnloadsClasses)) { 2129 jio_fprintf(defaultStream::error_stream(), 2130 "error: +ExplicitGCInvokesConcurrent[AndUnloadsClasses] conflicts" 2131 " with -UseAsyncConcMarkSweepGC"); 2132 status = false; 2133 } 2134 2135 if (PrintNMTStatistics) { 2136 #if INCLUDE_NMT 2137 if (MemTracker::tracking_level() == NMT_off) { 2138 #endif // INCLUDE_NMT 2139 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2140 PrintNMTStatistics = false; 2141 #if INCLUDE_NMT 2142 } 2143 #endif 2144 } 2145 2146 // Check lower bounds of the code cache 2147 // Template Interpreter code is approximately 3X larger in debug builds. 2148 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2149 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2150 jio_fprintf(defaultStream::error_stream(), 2151 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2152 os::vm_page_size()/K); 2153 status = false; 2154 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2155 jio_fprintf(defaultStream::error_stream(), 2156 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2157 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2158 status = false; 2159 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2160 jio_fprintf(defaultStream::error_stream(), 2161 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2162 min_code_cache_size/K); 2163 status = false; 2164 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2165 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2166 jio_fprintf(defaultStream::error_stream(), 2167 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2168 CODE_CACHE_SIZE_LIMIT/M); 2169 status = false; 2170 } else if (NonNMethodCodeHeapSize < min_code_cache_size){ 2171 jio_fprintf(defaultStream::error_stream(), 2172 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2173 min_code_cache_size/K); 2174 status = false; 2175 } else if ((!FLAG_IS_DEFAULT(NonNMethodCodeHeapSize) || !FLAG_IS_DEFAULT(ProfiledCodeHeapSize) || !FLAG_IS_DEFAULT(NonProfiledCodeHeapSize)) 2176 && (NonNMethodCodeHeapSize + NonProfiledCodeHeapSize + ProfiledCodeHeapSize) != ReservedCodeCacheSize) { 2177 jio_fprintf(defaultStream::error_stream(), 2178 "Invalid code heap sizes: NonNMethodCodeHeapSize(%dK) + ProfiledCodeHeapSize(%dK) + NonProfiledCodeHeapSize(%dK) = %dK. Must be equal to ReservedCodeCacheSize = %uK.\n", 2179 NonNMethodCodeHeapSize/K, ProfiledCodeHeapSize/K, NonProfiledCodeHeapSize/K, 2180 (NonNMethodCodeHeapSize + ProfiledCodeHeapSize + NonProfiledCodeHeapSize)/K, ReservedCodeCacheSize/K); 2181 status = false; 2182 } 2183 2184 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2185 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2186 } 2187 2188 return status; 2189 } 2190 2191 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2192 const char* option_type) { 2193 if (ignore) return false; 2194 2195 const char* spacer = " "; 2196 if (option_type == NULL) { 2197 option_type = ++spacer; // Set both to the empty string. 2198 } 2199 2200 if (os::obsolete_option(option)) { 2201 jio_fprintf(defaultStream::error_stream(), 2202 "Obsolete %s%soption: %s\n", option_type, spacer, 2203 option->optionString); 2204 return false; 2205 } else { 2206 jio_fprintf(defaultStream::error_stream(), 2207 "Unrecognized %s%soption: %s\n", option_type, spacer, 2208 option->optionString); 2209 return true; 2210 } 2211 } 2212 2213 static const char* user_assertion_options[] = { 2214 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2215 }; 2216 2217 static const char* system_assertion_options[] = { 2218 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2219 }; 2220 2221 bool Arguments::parse_uintx(const char* value, 2222 uintx* uintx_arg, 2223 uintx min_size) { 2224 2225 // Check the sign first since atomull() parses only unsigned values. 2226 bool value_is_positive = !(*value == '-'); 2227 2228 if (value_is_positive) { 2229 julong n; 2230 bool good_return = atomull(value, &n); 2231 if (good_return) { 2232 bool above_minimum = n >= min_size; 2233 bool value_is_too_large = n > max_uintx; 2234 2235 if (above_minimum && !value_is_too_large) { 2236 *uintx_arg = n; 2237 return true; 2238 } 2239 } 2240 } 2241 return false; 2242 } 2243 2244 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2245 julong* long_arg, 2246 julong min_size) { 2247 if (!atomull(s, long_arg)) return arg_unreadable; 2248 return check_memory_size(*long_arg, min_size); 2249 } 2250 2251 // Parse JavaVMInitArgs structure 2252 2253 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2254 const JavaVMInitArgs *java_options_args, 2255 const JavaVMInitArgs *cmd_line_args) { 2256 // For components of the system classpath. 2257 SysClassPath scp(Arguments::get_sysclasspath()); 2258 bool scp_assembly_required = false; 2259 2260 // Save default settings for some mode flags 2261 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2262 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2263 Arguments::_ClipInlining = ClipInlining; 2264 Arguments::_BackgroundCompilation = BackgroundCompilation; 2265 if (TieredCompilation) { 2266 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2267 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2268 } 2269 2270 // Setup flags for mixed which is the default 2271 set_mode_flags(_mixed); 2272 2273 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2274 // variable (if present). 2275 jint result = parse_each_vm_init_arg( 2276 java_tool_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2277 if (result != JNI_OK) { 2278 return result; 2279 } 2280 2281 // Parse args structure generated from the command line flags. 2282 result = parse_each_vm_init_arg(cmd_line_args, &scp, &scp_assembly_required, 2283 Flag::COMMAND_LINE); 2284 if (result != JNI_OK) { 2285 return result; 2286 } 2287 2288 // Parse args structure generated from the _JAVA_OPTIONS environment 2289 // variable (if present) (mimics classic VM) 2290 result = parse_each_vm_init_arg( 2291 java_options_args, &scp, &scp_assembly_required, Flag::ENVIRON_VAR); 2292 if (result != JNI_OK) { 2293 return result; 2294 } 2295 2296 // Do final processing now that all arguments have been parsed 2297 result = finalize_vm_init_args(&scp, scp_assembly_required); 2298 if (result != JNI_OK) { 2299 return result; 2300 } 2301 2302 return JNI_OK; 2303 } 2304 2305 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2306 // represents a valid JDWP agent. is_path==true denotes that we 2307 // are dealing with -agentpath (case where name is a path), otherwise with 2308 // -agentlib 2309 bool valid_jdwp_agent(char *name, bool is_path) { 2310 char *_name; 2311 const char *_jdwp = "jdwp"; 2312 size_t _len_jdwp, _len_prefix; 2313 2314 if (is_path) { 2315 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2316 return false; 2317 } 2318 2319 _name++; // skip past last path separator 2320 _len_prefix = strlen(JNI_LIB_PREFIX); 2321 2322 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2323 return false; 2324 } 2325 2326 _name += _len_prefix; 2327 _len_jdwp = strlen(_jdwp); 2328 2329 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2330 _name += _len_jdwp; 2331 } 2332 else { 2333 return false; 2334 } 2335 2336 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2337 return false; 2338 } 2339 2340 return true; 2341 } 2342 2343 if (strcmp(name, _jdwp) == 0) { 2344 return true; 2345 } 2346 2347 return false; 2348 } 2349 2350 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, 2351 SysClassPath* scp_p, 2352 bool* scp_assembly_required_p, 2353 Flag::Flags origin) { 2354 // Remaining part of option string 2355 const char* tail; 2356 2357 // iterate over arguments 2358 for (int index = 0; index < args->nOptions; index++) { 2359 bool is_absolute_path = false; // for -agentpath vs -agentlib 2360 2361 const JavaVMOption* option = args->options + index; 2362 2363 if (!match_option(option, "-Djava.class.path", &tail) && 2364 !match_option(option, "-Dsun.java.command", &tail) && 2365 !match_option(option, "-Dsun.java.launcher", &tail)) { 2366 2367 // add all jvm options to the jvm_args string. This string 2368 // is used later to set the java.vm.args PerfData string constant. 2369 // the -Djava.class.path and the -Dsun.java.command options are 2370 // omitted from jvm_args string as each have their own PerfData 2371 // string constant object. 2372 build_jvm_args(option->optionString); 2373 } 2374 2375 // -verbose:[class/gc/jni] 2376 if (match_option(option, "-verbose", &tail)) { 2377 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2378 if (FLAG_SET_CMDLINE(bool, TraceClassLoading, true) != Flag::SUCCESS) { 2379 return JNI_EINVAL; 2380 } 2381 if (FLAG_SET_CMDLINE(bool, TraceClassUnloading, true) != Flag::SUCCESS) { 2382 return JNI_EINVAL; 2383 } 2384 } else if (!strcmp(tail, ":gc")) { 2385 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 2386 return JNI_EINVAL; 2387 } 2388 } else if (!strcmp(tail, ":jni")) { 2389 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2390 return JNI_EINVAL; 2391 } 2392 } 2393 // -da / -ea / -disableassertions / -enableassertions 2394 // These accept an optional class/package name separated by a colon, e.g., 2395 // -da:java.lang.Thread. 2396 } else if (match_option(option, user_assertion_options, &tail, true)) { 2397 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2398 if (*tail == '\0') { 2399 JavaAssertions::setUserClassDefault(enable); 2400 } else { 2401 assert(*tail == ':', "bogus match by match_option()"); 2402 JavaAssertions::addOption(tail + 1, enable); 2403 } 2404 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2405 } else if (match_option(option, system_assertion_options, &tail, false)) { 2406 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2407 JavaAssertions::setSystemClassDefault(enable); 2408 // -bootclasspath: 2409 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2410 scp_p->reset_path(tail); 2411 *scp_assembly_required_p = true; 2412 // -bootclasspath/a: 2413 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2414 scp_p->add_suffix(tail); 2415 *scp_assembly_required_p = true; 2416 // -bootclasspath/p: 2417 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2418 scp_p->add_prefix(tail); 2419 *scp_assembly_required_p = true; 2420 // -Xrun 2421 } else if (match_option(option, "-Xrun", &tail)) { 2422 if (tail != NULL) { 2423 const char* pos = strchr(tail, ':'); 2424 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2425 char* name = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2426 name[len] = '\0'; 2427 2428 char *options = NULL; 2429 if(pos != NULL) { 2430 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2431 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtInternal), pos+1, len2); 2432 } 2433 #if !INCLUDE_JVMTI 2434 if (strcmp(name, "jdwp") == 0) { 2435 jio_fprintf(defaultStream::error_stream(), 2436 "Debugging agents are not supported in this VM\n"); 2437 return JNI_ERR; 2438 } 2439 #endif // !INCLUDE_JVMTI 2440 add_init_library(name, options); 2441 } 2442 // -agentlib and -agentpath 2443 } else if (match_option(option, "-agentlib:", &tail) || 2444 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2445 if(tail != NULL) { 2446 const char* pos = strchr(tail, '='); 2447 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2448 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtInternal), tail, len); 2449 name[len] = '\0'; 2450 2451 char *options = NULL; 2452 if(pos != NULL) { 2453 options = os::strdup_check_oom(pos + 1, mtInternal); 2454 } 2455 #if !INCLUDE_JVMTI 2456 if (valid_jdwp_agent(name, is_absolute_path)) { 2457 jio_fprintf(defaultStream::error_stream(), 2458 "Debugging agents are not supported in this VM\n"); 2459 return JNI_ERR; 2460 } 2461 #endif // !INCLUDE_JVMTI 2462 add_init_agent(name, options, is_absolute_path); 2463 } 2464 // -javaagent 2465 } else if (match_option(option, "-javaagent:", &tail)) { 2466 #if !INCLUDE_JVMTI 2467 jio_fprintf(defaultStream::error_stream(), 2468 "Instrumentation agents are not supported in this VM\n"); 2469 return JNI_ERR; 2470 #else 2471 if(tail != NULL) { 2472 char *options = strcpy(NEW_C_HEAP_ARRAY(char, strlen(tail) + 1, mtInternal), tail); 2473 add_init_agent("instrument", options, false); 2474 } 2475 #endif // !INCLUDE_JVMTI 2476 // -Xnoclassgc 2477 } else if (match_option(option, "-Xnoclassgc")) { 2478 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2479 return JNI_EINVAL; 2480 } 2481 // -Xconcgc 2482 } else if (match_option(option, "-Xconcgc")) { 2483 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2484 return JNI_EINVAL; 2485 } 2486 // -Xnoconcgc 2487 } else if (match_option(option, "-Xnoconcgc")) { 2488 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2489 return JNI_EINVAL; 2490 } 2491 // -Xbatch 2492 } else if (match_option(option, "-Xbatch")) { 2493 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2494 return JNI_EINVAL; 2495 } 2496 // -Xmn for compatibility with other JVM vendors 2497 } else if (match_option(option, "-Xmn", &tail)) { 2498 julong long_initial_young_size = 0; 2499 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2500 if (errcode != arg_in_range) { 2501 jio_fprintf(defaultStream::error_stream(), 2502 "Invalid initial young generation size: %s\n", option->optionString); 2503 describe_range_error(errcode); 2504 return JNI_EINVAL; 2505 } 2506 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2507 return JNI_EINVAL; 2508 } 2509 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2510 return JNI_EINVAL; 2511 } 2512 // -Xms 2513 } else if (match_option(option, "-Xms", &tail)) { 2514 julong long_initial_heap_size = 0; 2515 // an initial heap size of 0 means automatically determine 2516 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2517 if (errcode != arg_in_range) { 2518 jio_fprintf(defaultStream::error_stream(), 2519 "Invalid initial heap size: %s\n", option->optionString); 2520 describe_range_error(errcode); 2521 return JNI_EINVAL; 2522 } 2523 set_min_heap_size((size_t)long_initial_heap_size); 2524 // Currently the minimum size and the initial heap sizes are the same. 2525 // Can be overridden with -XX:InitialHeapSize. 2526 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2527 return JNI_EINVAL; 2528 } 2529 // -Xmx 2530 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2531 julong long_max_heap_size = 0; 2532 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2533 if (errcode != arg_in_range) { 2534 jio_fprintf(defaultStream::error_stream(), 2535 "Invalid maximum heap size: %s\n", option->optionString); 2536 describe_range_error(errcode); 2537 return JNI_EINVAL; 2538 } 2539 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2540 return JNI_EINVAL; 2541 } 2542 // Xmaxf 2543 } else if (match_option(option, "-Xmaxf", &tail)) { 2544 char* err; 2545 int maxf = (int)(strtod(tail, &err) * 100); 2546 if (*err != '\0' || *tail == '\0') { 2547 jio_fprintf(defaultStream::error_stream(), 2548 "Bad max heap free percentage size: %s\n", 2549 option->optionString); 2550 return JNI_EINVAL; 2551 } else { 2552 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2553 return JNI_EINVAL; 2554 } 2555 } 2556 // Xminf 2557 } else if (match_option(option, "-Xminf", &tail)) { 2558 char* err; 2559 int minf = (int)(strtod(tail, &err) * 100); 2560 if (*err != '\0' || *tail == '\0') { 2561 jio_fprintf(defaultStream::error_stream(), 2562 "Bad min heap free percentage size: %s\n", 2563 option->optionString); 2564 return JNI_EINVAL; 2565 } else { 2566 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2567 return JNI_EINVAL; 2568 } 2569 } 2570 // -Xss 2571 } else if (match_option(option, "-Xss", &tail)) { 2572 julong long_ThreadStackSize = 0; 2573 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 2574 if (errcode != arg_in_range) { 2575 jio_fprintf(defaultStream::error_stream(), 2576 "Invalid thread stack size: %s\n", option->optionString); 2577 describe_range_error(errcode); 2578 return JNI_EINVAL; 2579 } 2580 // Internally track ThreadStackSize in units of 1024 bytes. 2581 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 2582 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 2583 return JNI_EINVAL; 2584 } 2585 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads 2586 } else if (match_option(option, "-Xoss", &tail) || 2587 match_option(option, "-Xsqnopause") || 2588 match_option(option, "-Xoptimize") || 2589 match_option(option, "-Xboundthreads")) { 2590 // All these options are deprecated in JDK 9 and will be removed in a future release 2591 char version[256]; 2592 JDK_Version::jdk(9).to_string(version, sizeof(version)); 2593 warning("ignoring option %s; support was removed in %s", option->optionString, version); 2594 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 2595 julong long_CodeCacheExpansionSize = 0; 2596 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 2597 if (errcode != arg_in_range) { 2598 jio_fprintf(defaultStream::error_stream(), 2599 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 2600 os::vm_page_size()/K); 2601 return JNI_EINVAL; 2602 } 2603 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 2604 return JNI_EINVAL; 2605 } 2606 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2607 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2608 julong long_ReservedCodeCacheSize = 0; 2609 2610 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2611 if (errcode != arg_in_range) { 2612 jio_fprintf(defaultStream::error_stream(), 2613 "Invalid maximum code cache size: %s.\n", option->optionString); 2614 return JNI_EINVAL; 2615 } 2616 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 2617 return JNI_EINVAL; 2618 } 2619 // -XX:NonNMethodCodeHeapSize= 2620 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 2621 julong long_NonNMethodCodeHeapSize = 0; 2622 2623 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 2624 if (errcode != arg_in_range) { 2625 jio_fprintf(defaultStream::error_stream(), 2626 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 2627 return JNI_EINVAL; 2628 } 2629 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 2630 return JNI_EINVAL; 2631 } 2632 // -XX:ProfiledCodeHeapSize= 2633 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 2634 julong long_ProfiledCodeHeapSize = 0; 2635 2636 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 2637 if (errcode != arg_in_range) { 2638 jio_fprintf(defaultStream::error_stream(), 2639 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 2640 return JNI_EINVAL; 2641 } 2642 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 2643 return JNI_EINVAL; 2644 } 2645 // -XX:NonProfiledCodeHeapSizee= 2646 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 2647 julong long_NonProfiledCodeHeapSize = 0; 2648 2649 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 2650 if (errcode != arg_in_range) { 2651 jio_fprintf(defaultStream::error_stream(), 2652 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 2653 return JNI_EINVAL; 2654 } 2655 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 2656 return JNI_EINVAL; 2657 } 2658 // -green 2659 } else if (match_option(option, "-green")) { 2660 jio_fprintf(defaultStream::error_stream(), 2661 "Green threads support not available\n"); 2662 return JNI_EINVAL; 2663 // -native 2664 } else if (match_option(option, "-native")) { 2665 // HotSpot always uses native threads, ignore silently for compatibility 2666 // -Xrs 2667 } else if (match_option(option, "-Xrs")) { 2668 // Classic/EVM option, new functionality 2669 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 2670 return JNI_EINVAL; 2671 } 2672 } else if (match_option(option, "-Xusealtsigs")) { 2673 // change default internal VM signals used - lower case for back compat 2674 if (FLAG_SET_CMDLINE(bool, UseAltSigs, true) != Flag::SUCCESS) { 2675 return JNI_EINVAL; 2676 } 2677 // -Xprof 2678 } else if (match_option(option, "-Xprof")) { 2679 #if INCLUDE_FPROF 2680 _has_profile = true; 2681 #else // INCLUDE_FPROF 2682 jio_fprintf(defaultStream::error_stream(), 2683 "Flat profiling is not supported in this VM.\n"); 2684 return JNI_ERR; 2685 #endif // INCLUDE_FPROF 2686 // -Xconcurrentio 2687 } else if (match_option(option, "-Xconcurrentio")) { 2688 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 2689 return JNI_EINVAL; 2690 } 2691 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2692 return JNI_EINVAL; 2693 } 2694 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 2695 return JNI_EINVAL; 2696 } 2697 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 2698 return JNI_EINVAL; 2699 } 2700 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 2701 return JNI_EINVAL; 2702 } 2703 2704 // -Xinternalversion 2705 } else if (match_option(option, "-Xinternalversion")) { 2706 jio_fprintf(defaultStream::output_stream(), "%s\n", 2707 VM_Version::internal_vm_info_string()); 2708 vm_exit(0); 2709 #ifndef PRODUCT 2710 // -Xprintflags 2711 } else if (match_option(option, "-Xprintflags")) { 2712 CommandLineFlags::printFlags(tty, false); 2713 vm_exit(0); 2714 #endif 2715 // -D 2716 } else if (match_option(option, "-D", &tail)) { 2717 const char* value; 2718 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2719 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2720 // abort if -Djava.endorsed.dirs is set 2721 jio_fprintf(defaultStream::output_stream(), 2722 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2723 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2724 return JNI_EINVAL; 2725 } 2726 if (match_option(option, "-Djava.ext.dirs=", &value) && 2727 *value != '\0' && strcmp(value, "\"\"") != 0) { 2728 // abort if -Djava.ext.dirs is set 2729 jio_fprintf(defaultStream::output_stream(), 2730 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2731 return JNI_EINVAL; 2732 } 2733 2734 if (!add_property(tail)) { 2735 return JNI_ENOMEM; 2736 } 2737 // Out of the box management support 2738 if (match_option(option, "-Dcom.sun.management", &tail)) { 2739 #if INCLUDE_MANAGEMENT 2740 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 2741 return JNI_EINVAL; 2742 } 2743 #else 2744 jio_fprintf(defaultStream::output_stream(), 2745 "-Dcom.sun.management is not supported in this VM.\n"); 2746 return JNI_ERR; 2747 #endif 2748 } 2749 // -Xint 2750 } else if (match_option(option, "-Xint")) { 2751 set_mode_flags(_int); 2752 // -Xmixed 2753 } else if (match_option(option, "-Xmixed")) { 2754 set_mode_flags(_mixed); 2755 // -Xcomp 2756 } else if (match_option(option, "-Xcomp")) { 2757 // for testing the compiler; turn off all flags that inhibit compilation 2758 set_mode_flags(_comp); 2759 // -Xshare:dump 2760 } else if (match_option(option, "-Xshare:dump")) { 2761 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 2762 return JNI_EINVAL; 2763 } 2764 set_mode_flags(_int); // Prevent compilation, which creates objects 2765 // -Xshare:on 2766 } else if (match_option(option, "-Xshare:on")) { 2767 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 2768 return JNI_EINVAL; 2769 } 2770 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 2771 return JNI_EINVAL; 2772 } 2773 // -Xshare:auto 2774 } else if (match_option(option, "-Xshare:auto")) { 2775 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 2776 return JNI_EINVAL; 2777 } 2778 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 2779 return JNI_EINVAL; 2780 } 2781 // -Xshare:off 2782 } else if (match_option(option, "-Xshare:off")) { 2783 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 2784 return JNI_EINVAL; 2785 } 2786 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 2787 return JNI_EINVAL; 2788 } 2789 // -Xverify 2790 } else if (match_option(option, "-Xverify", &tail)) { 2791 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2792 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 2793 return JNI_EINVAL; 2794 } 2795 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 2796 return JNI_EINVAL; 2797 } 2798 } else if (strcmp(tail, ":remote") == 0) { 2799 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 2800 return JNI_EINVAL; 2801 } 2802 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 2803 return JNI_EINVAL; 2804 } 2805 } else if (strcmp(tail, ":none") == 0) { 2806 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 2807 return JNI_EINVAL; 2808 } 2809 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 2810 return JNI_EINVAL; 2811 } 2812 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2813 return JNI_EINVAL; 2814 } 2815 // -Xdebug 2816 } else if (match_option(option, "-Xdebug")) { 2817 // note this flag has been used, then ignore 2818 set_xdebug_mode(true); 2819 // -Xnoagent 2820 } else if (match_option(option, "-Xnoagent")) { 2821 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2822 } else if (match_option(option, "-Xloggc:", &tail)) { 2823 // Redirect GC output to the file. -Xloggc:<filename> 2824 // ostream_init_log(), when called will use this filename 2825 // to initialize a fileStream. 2826 _gc_log_filename = os::strdup_check_oom(tail); 2827 if (!is_filename_valid(_gc_log_filename)) { 2828 jio_fprintf(defaultStream::output_stream(), 2829 "Invalid file name for use with -Xloggc: Filename can only contain the " 2830 "characters [A-Z][a-z][0-9]-_.%%[p|t] but it has been %s\n" 2831 "Note %%p or %%t can only be used once\n", _gc_log_filename); 2832 return JNI_EINVAL; 2833 } 2834 if (FLAG_SET_CMDLINE(bool, PrintGC, true) != Flag::SUCCESS) { 2835 return JNI_EINVAL; 2836 } 2837 if (FLAG_SET_CMDLINE(bool, PrintGCTimeStamps, true) != Flag::SUCCESS) { 2838 return JNI_EINVAL; 2839 } 2840 // JNI hooks 2841 } else if (match_option(option, "-Xcheck", &tail)) { 2842 if (!strcmp(tail, ":jni")) { 2843 #if !INCLUDE_JNI_CHECK 2844 warning("JNI CHECKING is not supported in this VM"); 2845 #else 2846 CheckJNICalls = true; 2847 #endif // INCLUDE_JNI_CHECK 2848 } else if (is_bad_option(option, args->ignoreUnrecognized, 2849 "check")) { 2850 return JNI_EINVAL; 2851 } 2852 } else if (match_option(option, "vfprintf")) { 2853 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2854 } else if (match_option(option, "exit")) { 2855 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2856 } else if (match_option(option, "abort")) { 2857 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2858 // -XX:+AggressiveHeap 2859 } else if (match_option(option, "-XX:+AggressiveHeap")) { 2860 2861 // This option inspects the machine and attempts to set various 2862 // parameters to be optimal for long-running, memory allocation 2863 // intensive jobs. It is intended for machines with large 2864 // amounts of cpu and memory. 2865 2866 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2867 // VM, but we may not be able to represent the total physical memory 2868 // available (like having 8gb of memory on a box but using a 32bit VM). 2869 // Thus, we need to make sure we're using a julong for intermediate 2870 // calculations. 2871 julong initHeapSize; 2872 julong total_memory = os::physical_memory(); 2873 2874 if (total_memory < (julong)256*M) { 2875 jio_fprintf(defaultStream::error_stream(), 2876 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2877 vm_exit(1); 2878 } 2879 2880 // The heap size is half of available memory, or (at most) 2881 // all of possible memory less 160mb (leaving room for the OS 2882 // when using ISM). This is the maximum; because adaptive sizing 2883 // is turned on below, the actual space used may be smaller. 2884 2885 initHeapSize = MIN2(total_memory / (julong)2, 2886 total_memory - (julong)160*M); 2887 2888 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2889 2890 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2891 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2892 return JNI_EINVAL; 2893 } 2894 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2895 return JNI_EINVAL; 2896 } 2897 // Currently the minimum size and the initial heap sizes are the same. 2898 set_min_heap_size(initHeapSize); 2899 } 2900 if (FLAG_IS_DEFAULT(NewSize)) { 2901 // Make the young generation 3/8ths of the total heap. 2902 if (FLAG_SET_CMDLINE(size_t, NewSize, 2903 ((julong)MaxHeapSize / (julong)8) * (julong)3) != Flag::SUCCESS) { 2904 return JNI_EINVAL; 2905 } 2906 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2907 return JNI_EINVAL; 2908 } 2909 } 2910 2911 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2912 FLAG_SET_DEFAULT(UseLargePages, true); 2913 #endif 2914 2915 // Increase some data structure sizes for efficiency 2916 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2917 return JNI_EINVAL; 2918 } 2919 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2920 return JNI_EINVAL; 2921 } 2922 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256*K) != Flag::SUCCESS) { 2923 return JNI_EINVAL; 2924 } 2925 2926 // See the OldPLABSize comment below, but replace 'after promotion' 2927 // with 'after copying'. YoungPLABSize is the size of the survivor 2928 // space per-gc-thread buffers. The default is 4kw. 2929 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256*K) != Flag::SUCCESS) { // Note: this is in words 2930 return JNI_EINVAL; 2931 } 2932 2933 // OldPLABSize is the size of the buffers in the old gen that 2934 // UseParallelGC uses to promote live data that doesn't fit in the 2935 // survivor spaces. At any given time, there's one for each gc thread. 2936 // The default size is 1kw. These buffers are rarely used, since the 2937 // survivor spaces are usually big enough. For specjbb, however, there 2938 // are occasions when there's lots of live data in the young gen 2939 // and we end up promoting some of it. We don't have a definite 2940 // explanation for why bumping OldPLABSize helps, but the theory 2941 // is that a bigger PLAB results in retaining something like the 2942 // original allocation order after promotion, which improves mutator 2943 // locality. A minor effect may be that larger PLABs reduce the 2944 // number of PLAB allocation events during gc. The value of 8kw 2945 // was arrived at by experimenting with specjbb. 2946 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8*K) != Flag::SUCCESS) { // Note: this is in words 2947 return JNI_EINVAL; 2948 } 2949 2950 // Enable parallel GC and adaptive generation sizing 2951 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2952 return JNI_EINVAL; 2953 } 2954 FLAG_SET_DEFAULT(ParallelGCThreads, 2955 Abstract_VM_Version::parallel_worker_threads()); 2956 2957 // Encourage steady state memory management 2958 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2959 return JNI_EINVAL; 2960 } 2961 2962 // This appears to improve mutator locality 2963 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2964 return JNI_EINVAL; 2965 } 2966 2967 // Get around early Solaris scheduling bug 2968 // (affinity vs other jobs on system) 2969 // but disallow DR and offlining (5008695). 2970 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2971 return JNI_EINVAL; 2972 } 2973 2974 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2975 // and the last option wins. 2976 } else if (match_option(option, "-XX:+NeverTenure")) { 2977 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 2978 return JNI_EINVAL; 2979 } 2980 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 2981 return JNI_EINVAL; 2982 } 2983 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 2984 return JNI_EINVAL; 2985 } 2986 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2987 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 2988 return JNI_EINVAL; 2989 } 2990 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 2991 return JNI_EINVAL; 2992 } 2993 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 2994 return JNI_EINVAL; 2995 } 2996 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2997 uintx max_tenuring_thresh = 0; 2998 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2999 jio_fprintf(defaultStream::error_stream(), 3000 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3001 return JNI_EINVAL; 3002 } 3003 3004 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3005 return JNI_EINVAL; 3006 } 3007 3008 if (MaxTenuringThreshold == 0) { 3009 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3010 return JNI_EINVAL; 3011 } 3012 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3013 return JNI_EINVAL; 3014 } 3015 } else { 3016 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3017 return JNI_EINVAL; 3018 } 3019 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3020 return JNI_EINVAL; 3021 } 3022 } 3023 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3024 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3025 return JNI_EINVAL; 3026 } 3027 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3028 return JNI_EINVAL; 3029 } 3030 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3031 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3032 return JNI_EINVAL; 3033 } 3034 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3035 return JNI_EINVAL; 3036 } 3037 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3038 #if defined(DTRACE_ENABLED) 3039 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3040 return JNI_EINVAL; 3041 } 3042 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3043 return JNI_EINVAL; 3044 } 3045 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3046 return JNI_EINVAL; 3047 } 3048 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3049 return JNI_EINVAL; 3050 } 3051 #else // defined(DTRACE_ENABLED) 3052 jio_fprintf(defaultStream::error_stream(), 3053 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3054 return JNI_EINVAL; 3055 #endif // defined(DTRACE_ENABLED) 3056 #ifdef ASSERT 3057 } else if (match_option(option, "-XX:+FullGCALot")) { 3058 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3059 return JNI_EINVAL; 3060 } 3061 // disable scavenge before parallel mark-compact 3062 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3063 return JNI_EINVAL; 3064 } 3065 #endif 3066 } else if (match_option(option, "-XX:CMSMarkStackSize=", &tail) || 3067 match_option(option, "-XX:G1MarkStackSize=", &tail)) { 3068 julong stack_size = 0; 3069 ArgsRange errcode = parse_memory_size(tail, &stack_size, 1); 3070 if (errcode != arg_in_range) { 3071 jio_fprintf(defaultStream::error_stream(), 3072 "Invalid mark stack size: %s\n", option->optionString); 3073 describe_range_error(errcode); 3074 return JNI_EINVAL; 3075 } 3076 jio_fprintf(defaultStream::error_stream(), 3077 "Please use -XX:MarkStackSize in place of " 3078 "-XX:CMSMarkStackSize or -XX:G1MarkStackSize in the future\n"); 3079 if (FLAG_SET_CMDLINE(size_t, MarkStackSize, stack_size) != Flag::SUCCESS) { 3080 return JNI_EINVAL; 3081 } 3082 } else if (match_option(option, "-XX:CMSMarkStackSizeMax=", &tail)) { 3083 julong max_stack_size = 0; 3084 ArgsRange errcode = parse_memory_size(tail, &max_stack_size, 1); 3085 if (errcode != arg_in_range) { 3086 jio_fprintf(defaultStream::error_stream(), 3087 "Invalid maximum mark stack size: %s\n", 3088 option->optionString); 3089 describe_range_error(errcode); 3090 return JNI_EINVAL; 3091 } 3092 jio_fprintf(defaultStream::error_stream(), 3093 "Please use -XX:MarkStackSizeMax in place of " 3094 "-XX:CMSMarkStackSizeMax in the future\n"); 3095 if (FLAG_SET_CMDLINE(size_t, MarkStackSizeMax, max_stack_size) != Flag::SUCCESS) { 3096 return JNI_EINVAL; 3097 } 3098 } else if (match_option(option, "-XX:ParallelMarkingThreads=", &tail) || 3099 match_option(option, "-XX:ParallelCMSThreads=", &tail)) { 3100 uintx conc_threads = 0; 3101 if (!parse_uintx(tail, &conc_threads, 1)) { 3102 jio_fprintf(defaultStream::error_stream(), 3103 "Invalid concurrent threads: %s\n", option->optionString); 3104 return JNI_EINVAL; 3105 } 3106 jio_fprintf(defaultStream::error_stream(), 3107 "Please use -XX:ConcGCThreads in place of " 3108 "-XX:ParallelMarkingThreads or -XX:ParallelCMSThreads in the future\n"); 3109 if (FLAG_SET_CMDLINE(uint, ConcGCThreads, conc_threads) != Flag::SUCCESS) { 3110 return JNI_EINVAL; 3111 } 3112 } else if (match_option(option, "-XX:MaxDirectMemorySize=", &tail)) { 3113 julong max_direct_memory_size = 0; 3114 ArgsRange errcode = parse_memory_size(tail, &max_direct_memory_size, 0); 3115 if (errcode != arg_in_range) { 3116 jio_fprintf(defaultStream::error_stream(), 3117 "Invalid maximum direct memory size: %s\n", 3118 option->optionString); 3119 describe_range_error(errcode); 3120 return JNI_EINVAL; 3121 } 3122 if (FLAG_SET_CMDLINE(size_t, MaxDirectMemorySize, max_direct_memory_size) != Flag::SUCCESS) { 3123 return JNI_EINVAL; 3124 } 3125 #if !INCLUDE_MANAGEMENT 3126 } else if (match_option(option, "-XX:+ManagementServer")) { 3127 jio_fprintf(defaultStream::error_stream(), 3128 "ManagementServer is not supported in this VM.\n"); 3129 return JNI_ERR; 3130 #endif // INCLUDE_MANAGEMENT 3131 // CreateMinidumpOnCrash is removed, and replaced by CreateCoredumpOnCrash 3132 } else if (match_option(option, "-XX:+CreateMinidumpOnCrash")) { 3133 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, true) != Flag::SUCCESS) { 3134 return JNI_EINVAL; 3135 } 3136 jio_fprintf(defaultStream::output_stream(), 3137 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is on\n"); 3138 } else if (match_option(option, "-XX:-CreateMinidumpOnCrash")) { 3139 if (FLAG_SET_CMDLINE(bool, CreateCoredumpOnCrash, false) != Flag::SUCCESS) { 3140 return JNI_EINVAL; 3141 } 3142 jio_fprintf(defaultStream::output_stream(), 3143 "CreateMinidumpOnCrash is replaced by CreateCoredumpOnCrash: CreateCoredumpOnCrash is off\n"); 3144 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3145 // Skip -XX:Flags= since that case has already been handled 3146 if (strncmp(tail, "Flags=", strlen("Flags=")) != 0) { 3147 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3148 return JNI_EINVAL; 3149 } 3150 } 3151 // Unknown option 3152 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3153 return JNI_ERR; 3154 } 3155 } 3156 3157 // PrintSharedArchiveAndExit will turn on 3158 // -Xshare:on 3159 // -XX:+TraceClassPaths 3160 if (PrintSharedArchiveAndExit) { 3161 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3162 return JNI_EINVAL; 3163 } 3164 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3165 return JNI_EINVAL; 3166 } 3167 if (FLAG_SET_CMDLINE(bool, TraceClassPaths, true) != Flag::SUCCESS) { 3168 return JNI_EINVAL; 3169 } 3170 } 3171 3172 // Change the default value for flags which have different default values 3173 // when working with older JDKs. 3174 #ifdef LINUX 3175 if (JDK_Version::current().compare_major(6) <= 0 && 3176 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3177 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3178 } 3179 #endif // LINUX 3180 fix_appclasspath(); 3181 return JNI_OK; 3182 } 3183 3184 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3185 // 3186 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3187 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3188 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3189 // path is treated as the current directory. 3190 // 3191 // This causes problems with CDS, which requires that all directories specified in the classpath 3192 // must be empty. In most cases, applications do NOT want to load classes from the current 3193 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3194 // scripts compatible with CDS. 3195 void Arguments::fix_appclasspath() { 3196 if (IgnoreEmptyClassPaths) { 3197 const char separator = *os::path_separator(); 3198 const char* src = _java_class_path->value(); 3199 3200 // skip over all the leading empty paths 3201 while (*src == separator) { 3202 src ++; 3203 } 3204 3205 char* copy = os::strdup_check_oom(src, mtInternal); 3206 3207 // trim all trailing empty paths 3208 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3209 *tail = '\0'; 3210 } 3211 3212 char from[3] = {separator, separator, '\0'}; 3213 char to [2] = {separator, '\0'}; 3214 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3215 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3216 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3217 } 3218 3219 _java_class_path->set_value(copy); 3220 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3221 } 3222 3223 if (!PrintSharedArchiveAndExit) { 3224 ClassLoader::trace_class_path("[classpath: ", _java_class_path->value()); 3225 } 3226 } 3227 3228 static bool has_jar_files(const char* directory) { 3229 DIR* dir = os::opendir(directory); 3230 if (dir == NULL) return false; 3231 3232 struct dirent *entry; 3233 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtInternal); 3234 bool hasJarFile = false; 3235 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3236 const char* name = entry->d_name; 3237 const char* ext = name + strlen(name) - 4; 3238 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3239 } 3240 FREE_C_HEAP_ARRAY(char, dbuf); 3241 os::closedir(dir); 3242 return hasJarFile ; 3243 } 3244 3245 static int check_non_empty_dirs(const char* path) { 3246 const char separator = *os::path_separator(); 3247 const char* const end = path + strlen(path); 3248 int nonEmptyDirs = 0; 3249 while (path < end) { 3250 const char* tmp_end = strchr(path, separator); 3251 if (tmp_end == NULL) { 3252 if (has_jar_files(path)) { 3253 nonEmptyDirs++; 3254 jio_fprintf(defaultStream::output_stream(), 3255 "Non-empty directory: %s\n", path); 3256 } 3257 path = end; 3258 } else { 3259 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtInternal); 3260 memcpy(dirpath, path, tmp_end - path); 3261 dirpath[tmp_end - path] = '\0'; 3262 if (has_jar_files(dirpath)) { 3263 nonEmptyDirs++; 3264 jio_fprintf(defaultStream::output_stream(), 3265 "Non-empty directory: %s\n", dirpath); 3266 } 3267 FREE_C_HEAP_ARRAY(char, dirpath); 3268 path = tmp_end + 1; 3269 } 3270 } 3271 return nonEmptyDirs; 3272 } 3273 3274 jint Arguments::finalize_vm_init_args(SysClassPath* scp_p, bool scp_assembly_required) { 3275 // check if the default lib/endorsed directory exists; if so, error 3276 char path[JVM_MAXPATHLEN]; 3277 const char* fileSep = os::file_separator(); 3278 sprintf(path, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3279 3280 if (CheckEndorsedAndExtDirs) { 3281 int nonEmptyDirs = 0; 3282 // check endorsed directory 3283 nonEmptyDirs += check_non_empty_dirs(path); 3284 // check the extension directories 3285 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3286 if (nonEmptyDirs > 0) { 3287 return JNI_ERR; 3288 } 3289 } 3290 3291 DIR* dir = os::opendir(path); 3292 if (dir != NULL) { 3293 jio_fprintf(defaultStream::output_stream(), 3294 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3295 "in modular form will be supported via the concept of upgradeable modules.\n"); 3296 os::closedir(dir); 3297 return JNI_ERR; 3298 } 3299 3300 sprintf(path, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3301 dir = os::opendir(path); 3302 if (dir != NULL) { 3303 jio_fprintf(defaultStream::output_stream(), 3304 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3305 "Use -classpath instead.\n."); 3306 os::closedir(dir); 3307 return JNI_ERR; 3308 } 3309 3310 if (scp_assembly_required) { 3311 // Assemble the bootclasspath elements into the final path. 3312 char *combined_path = scp_p->combined_path(); 3313 Arguments::set_sysclasspath(combined_path); 3314 FREE_C_HEAP_ARRAY(char, combined_path); 3315 } 3316 3317 // This must be done after all arguments have been processed. 3318 // java_compiler() true means set to "NONE" or empty. 3319 if (java_compiler() && !xdebug_mode()) { 3320 // For backwards compatibility, we switch to interpreted mode if 3321 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3322 // not specified. 3323 set_mode_flags(_int); 3324 } 3325 3326 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3327 // but like -Xint, leave compilation thresholds unaffected. 3328 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3329 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3330 set_mode_flags(_int); 3331 } 3332 3333 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3334 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3335 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3336 } 3337 3338 #ifndef COMPILER2 3339 // Don't degrade server performance for footprint 3340 if (FLAG_IS_DEFAULT(UseLargePages) && 3341 MaxHeapSize < LargePageHeapSizeThreshold) { 3342 // No need for large granularity pages w/small heaps. 3343 // Note that large pages are enabled/disabled for both the 3344 // Java heap and the code cache. 3345 FLAG_SET_DEFAULT(UseLargePages, false); 3346 } 3347 3348 #else 3349 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3350 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3351 } 3352 #endif 3353 3354 #ifndef TIERED 3355 // Tiered compilation is undefined. 3356 UNSUPPORTED_OPTION(TieredCompilation, "TieredCompilation"); 3357 #endif 3358 3359 // If we are running in a headless jre, force java.awt.headless property 3360 // to be true unless the property has already been set. 3361 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3362 if (os::is_headless_jre()) { 3363 const char* headless = Arguments::get_property("java.awt.headless"); 3364 if (headless == NULL) { 3365 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3366 if (headless_env == NULL) { 3367 if (!add_property("java.awt.headless=true")) { 3368 return JNI_ENOMEM; 3369 } 3370 } else { 3371 char buffer[256]; 3372 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3373 if (!add_property(buffer)) { 3374 return JNI_ENOMEM; 3375 } 3376 } 3377 } 3378 } 3379 3380 if (UseConcMarkSweepGC && FLAG_IS_DEFAULT(UseParNewGC) && !UseParNewGC) { 3381 // CMS can only be used with ParNew 3382 FLAG_SET_ERGO(bool, UseParNewGC, true); 3383 } 3384 3385 if (!check_vm_args_consistency()) { 3386 return JNI_ERR; 3387 } 3388 3389 return JNI_OK; 3390 } 3391 3392 // Helper class for controlling the lifetime of JavaVMInitArgs 3393 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3394 // deleted on the destruction of the ScopedVMInitArgs object. 3395 class ScopedVMInitArgs : public StackObj { 3396 private: 3397 JavaVMInitArgs _args; 3398 3399 public: 3400 ScopedVMInitArgs() { 3401 _args.version = JNI_VERSION_1_2; 3402 _args.nOptions = 0; 3403 _args.options = NULL; 3404 _args.ignoreUnrecognized = false; 3405 } 3406 3407 // Populates the JavaVMInitArgs object represented by this 3408 // ScopedVMInitArgs object with the arguments in options. The 3409 // allocated memory is deleted by the destructor. If this method 3410 // returns anything other than JNI_OK, then this object is in a 3411 // partially constructed state, and should be abandoned. 3412 jint set_args(GrowableArray<JavaVMOption>* options) { 3413 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3414 JavaVMOption, options->length(), mtInternal); 3415 if (options_arr == NULL) { 3416 return JNI_ENOMEM; 3417 } 3418 _args.options = options_arr; 3419 3420 for (int i = 0; i < options->length(); i++) { 3421 options_arr[i] = options->at(i); 3422 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3423 if (options_arr[i].optionString == NULL) { 3424 // Rely on the destructor to do cleanup. 3425 _args.nOptions = i; 3426 return JNI_ENOMEM; 3427 } 3428 } 3429 3430 _args.nOptions = options->length(); 3431 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3432 return JNI_OK; 3433 } 3434 3435 JavaVMInitArgs* get() { return &_args; } 3436 3437 ~ScopedVMInitArgs() { 3438 if (_args.options == NULL) return; 3439 for (int i = 0; i < _args.nOptions; i++) { 3440 os::free(_args.options[i].optionString); 3441 } 3442 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3443 } 3444 }; 3445 3446 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3447 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3448 } 3449 3450 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3451 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3452 } 3453 3454 jint Arguments::parse_options_environment_variable(const char* name, 3455 ScopedVMInitArgs* vm_args) { 3456 char *buffer = ::getenv(name); 3457 3458 // Don't check this environment variable if user has special privileges 3459 // (e.g. unix su command). 3460 if (buffer == NULL || os::have_special_privileges()) { 3461 return JNI_OK; 3462 } 3463 3464 if ((buffer = os::strdup(buffer)) == NULL) { 3465 return JNI_ENOMEM; 3466 } 3467 3468 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaVMOption>(2, true); // Construct option array 3469 jio_fprintf(defaultStream::error_stream(), 3470 "Picked up %s: %s\n", name, buffer); 3471 char* rd = buffer; // pointer to the input string (rd) 3472 while (true) { // repeat for all options in the input string 3473 while (isspace(*rd)) rd++; // skip whitespace 3474 if (*rd == 0) break; // we re done when the input string is read completely 3475 3476 // The output, option string, overwrites the input string. 3477 // Because of quoting, the pointer to the option string (wrt) may lag the pointer to 3478 // input string (rd). 3479 char* wrt = rd; 3480 3481 JavaVMOption option; 3482 option.optionString = wrt; 3483 options->append(option); // Fill in option 3484 while (*rd != 0 && !isspace(*rd)) { // unquoted strings terminate with a space or NULL 3485 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3486 int quote = *rd; // matching quote to look for 3487 rd++; // don't copy open quote 3488 while (*rd != quote) { // include everything (even spaces) up until quote 3489 if (*rd == 0) { // string termination means unmatched string 3490 jio_fprintf(defaultStream::error_stream(), 3491 "Unmatched quote in %s\n", name); 3492 delete options; 3493 os::free(buffer); 3494 return JNI_ERR; 3495 } 3496 *wrt++ = *rd++; // copy to option string 3497 } 3498 rd++; // don't copy close quote 3499 } else { 3500 *wrt++ = *rd++; // copy to option string 3501 } 3502 } 3503 if (*rd != 0) { 3504 // In this case, the assignment to wrt below will make *rd nul, 3505 // which will interfere with the next loop iteration. 3506 rd++; 3507 } 3508 *wrt = 0; // Zero terminate option 3509 } 3510 3511 // Fill out JavaVMInitArgs structure. 3512 jint status = vm_args->set_args(options); 3513 3514 delete options; 3515 os::free(buffer); 3516 return status; 3517 } 3518 3519 void Arguments::set_shared_spaces_flags() { 3520 if (DumpSharedSpaces) { 3521 if (RequireSharedSpaces) { 3522 warning("cannot dump shared archive while using shared archive"); 3523 } 3524 UseSharedSpaces = false; 3525 #ifdef _LP64 3526 if (!UseCompressedOops || !UseCompressedClassPointers) { 3527 vm_exit_during_initialization( 3528 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3529 } 3530 } else { 3531 if (!UseCompressedOops || !UseCompressedClassPointers) { 3532 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3533 } 3534 #endif 3535 } 3536 } 3537 3538 #if !INCLUDE_ALL_GCS 3539 static void force_serial_gc() { 3540 FLAG_SET_DEFAULT(UseSerialGC, true); 3541 UNSUPPORTED_GC_OPTION(UseG1GC); 3542 UNSUPPORTED_GC_OPTION(UseParallelGC); 3543 UNSUPPORTED_GC_OPTION(UseParallelOldGC); 3544 UNSUPPORTED_GC_OPTION(UseConcMarkSweepGC); 3545 UNSUPPORTED_GC_OPTION(UseParNewGC); 3546 } 3547 #endif // INCLUDE_ALL_GCS 3548 3549 // Sharing support 3550 // Construct the path to the archive 3551 static char* get_shared_archive_path() { 3552 char *shared_archive_path; 3553 if (SharedArchiveFile == NULL) { 3554 char jvm_path[JVM_MAXPATHLEN]; 3555 os::jvm_path(jvm_path, sizeof(jvm_path)); 3556 char *end = strrchr(jvm_path, *os::file_separator()); 3557 if (end != NULL) *end = '\0'; 3558 size_t jvm_path_len = strlen(jvm_path); 3559 size_t file_sep_len = strlen(os::file_separator()); 3560 const size_t len = jvm_path_len + file_sep_len + 20; 3561 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtInternal); 3562 if (shared_archive_path != NULL) { 3563 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3564 jvm_path, os::file_separator()); 3565 } 3566 } else { 3567 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtInternal); 3568 } 3569 return shared_archive_path; 3570 } 3571 3572 #ifndef PRODUCT 3573 // Determine whether LogVMOutput should be implicitly turned on. 3574 static bool use_vm_log() { 3575 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3576 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3577 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3578 PrintAssembly || TraceDeoptimization || TraceDependencies || 3579 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3580 return true; 3581 } 3582 3583 #ifdef COMPILER1 3584 if (PrintC1Statistics) { 3585 return true; 3586 } 3587 #endif // COMPILER1 3588 3589 #ifdef COMPILER2 3590 if (PrintOptoAssembly || PrintOptoStatistics) { 3591 return true; 3592 } 3593 #endif // COMPILER2 3594 3595 return false; 3596 } 3597 #endif // PRODUCT 3598 3599 static jint match_special_option_and_act(const JavaVMInitArgs* args, 3600 char** flags_file) { 3601 // Remaining part of option string 3602 const char* tail; 3603 3604 for (int index = 0; index < args->nOptions; index++) { 3605 const JavaVMOption* option = args->options + index; 3606 if (ArgumentsExt::process_options(option)) { 3607 continue; 3608 } 3609 if (match_option(option, "-XX:Flags=", &tail)) { 3610 *flags_file = (char *) tail; 3611 continue; 3612 } 3613 if (match_option(option, "-XX:+PrintVMOptions")) { 3614 PrintVMOptions = true; 3615 continue; 3616 } 3617 if (match_option(option, "-XX:-PrintVMOptions")) { 3618 PrintVMOptions = false; 3619 continue; 3620 } 3621 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3622 IgnoreUnrecognizedVMOptions = true; 3623 continue; 3624 } 3625 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3626 IgnoreUnrecognizedVMOptions = false; 3627 continue; 3628 } 3629 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3630 CommandLineFlags::printFlags(tty, false); 3631 vm_exit(0); 3632 } 3633 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3634 #if INCLUDE_NMT 3635 // The launcher did not setup nmt environment variable properly. 3636 if (!MemTracker::check_launcher_nmt_support(tail)) { 3637 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3638 } 3639 3640 // Verify if nmt option is valid. 3641 if (MemTracker::verify_nmt_option()) { 3642 // Late initialization, still in single-threaded mode. 3643 if (MemTracker::tracking_level() >= NMT_summary) { 3644 MemTracker::init(); 3645 } 3646 } else { 3647 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3648 } 3649 continue; 3650 #else 3651 jio_fprintf(defaultStream::error_stream(), 3652 "Native Memory Tracking is not supported in this VM\n"); 3653 return JNI_ERR; 3654 #endif 3655 } 3656 3657 #ifndef PRODUCT 3658 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3659 CommandLineFlags::printFlags(tty, true); 3660 vm_exit(0); 3661 } 3662 #endif 3663 } 3664 return JNI_OK; 3665 } 3666 3667 static void print_options(const JavaVMInitArgs *args) { 3668 const char* tail; 3669 for (int index = 0; index < args->nOptions; index++) { 3670 const JavaVMOption *option = args->options + index; 3671 if (match_option(option, "-XX:", &tail)) { 3672 logOption(tail); 3673 } 3674 } 3675 } 3676 3677 // Parse entry point called from JNI_CreateJavaVM 3678 3679 jint Arguments::parse(const JavaVMInitArgs* args) { 3680 3681 // Initialize ranges and constraints 3682 CommandLineFlagRangeList::init(); 3683 CommandLineFlagConstraintList::init(); 3684 3685 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3686 const char* hotspotrc = ".hotspotrc"; 3687 char* flags_file = NULL; 3688 bool settings_file_specified = false; 3689 bool needs_hotspotrc_warning = false; 3690 ScopedVMInitArgs java_tool_options_args; 3691 ScopedVMInitArgs java_options_args; 3692 3693 jint code = 3694 parse_java_tool_options_environment_variable(&java_tool_options_args); 3695 if (code != JNI_OK) { 3696 return code; 3697 } 3698 3699 code = parse_java_options_environment_variable(&java_options_args); 3700 if (code != JNI_OK) { 3701 return code; 3702 } 3703 3704 code = 3705 match_special_option_and_act(java_tool_options_args.get(), &flags_file); 3706 if (code != JNI_OK) { 3707 return code; 3708 } 3709 3710 code = match_special_option_and_act(args, &flags_file); 3711 if (code != JNI_OK) { 3712 return code; 3713 } 3714 3715 code = match_special_option_and_act(java_options_args.get(), &flags_file); 3716 if (code != JNI_OK) { 3717 return code; 3718 } 3719 3720 settings_file_specified = (flags_file != NULL); 3721 3722 if (IgnoreUnrecognizedVMOptions) { 3723 // uncast const to modify the flag args->ignoreUnrecognized 3724 *(jboolean*)(&args->ignoreUnrecognized) = true; 3725 java_tool_options_args.get()->ignoreUnrecognized = true; 3726 java_options_args.get()->ignoreUnrecognized = true; 3727 } 3728 3729 // Parse specified settings file 3730 if (settings_file_specified) { 3731 if (!process_settings_file(flags_file, true, args->ignoreUnrecognized)) { 3732 return JNI_EINVAL; 3733 } 3734 } else { 3735 #ifdef ASSERT 3736 // Parse default .hotspotrc settings file 3737 if (!process_settings_file(".hotspotrc", false, args->ignoreUnrecognized)) { 3738 return JNI_EINVAL; 3739 } 3740 #else 3741 struct stat buf; 3742 if (os::stat(hotspotrc, &buf) == 0) { 3743 needs_hotspotrc_warning = true; 3744 } 3745 #endif 3746 } 3747 3748 if (PrintVMOptions) { 3749 print_options(java_tool_options_args.get()); 3750 print_options(args); 3751 print_options(java_options_args.get()); 3752 } 3753 3754 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3755 jint result = parse_vm_init_args(java_tool_options_args.get(), 3756 java_options_args.get(), args); 3757 3758 if (result != JNI_OK) { 3759 return result; 3760 } 3761 3762 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3763 SharedArchivePath = get_shared_archive_path(); 3764 if (SharedArchivePath == NULL) { 3765 return JNI_ENOMEM; 3766 } 3767 3768 // Set up VerifySharedSpaces 3769 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3770 VerifySharedSpaces = true; 3771 } 3772 3773 // Delay warning until here so that we've had a chance to process 3774 // the -XX:-PrintWarnings flag 3775 if (needs_hotspotrc_warning) { 3776 warning("%s file is present but has been ignored. " 3777 "Run with -XX:Flags=%s to load the file.", 3778 hotspotrc, hotspotrc); 3779 } 3780 3781 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3782 UNSUPPORTED_OPTION(UseLargePages, "-XX:+UseLargePages"); 3783 #endif 3784 3785 ArgumentsExt::report_unsupported_options(); 3786 3787 #ifndef PRODUCT 3788 if (TraceBytecodesAt != 0) { 3789 TraceBytecodes = true; 3790 } 3791 if (CountCompiledCalls) { 3792 if (UseCounterDecay) { 3793 warning("UseCounterDecay disabled because CountCalls is set"); 3794 UseCounterDecay = false; 3795 } 3796 } 3797 #endif // PRODUCT 3798 3799 if (ScavengeRootsInCode == 0) { 3800 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3801 warning("forcing ScavengeRootsInCode non-zero"); 3802 } 3803 ScavengeRootsInCode = 1; 3804 } 3805 3806 if (PrintGCDetails) { 3807 // Turn on -verbose:gc options as well 3808 PrintGC = true; 3809 } 3810 3811 // Set object alignment values. 3812 set_object_alignment(); 3813 3814 #if !INCLUDE_ALL_GCS 3815 force_serial_gc(); 3816 #endif // INCLUDE_ALL_GCS 3817 #if !INCLUDE_CDS 3818 if (DumpSharedSpaces || RequireSharedSpaces) { 3819 jio_fprintf(defaultStream::error_stream(), 3820 "Shared spaces are not supported in this VM\n"); 3821 return JNI_ERR; 3822 } 3823 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 3824 warning("Shared spaces are not supported in this VM"); 3825 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3826 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 3827 } 3828 no_shared_spaces("CDS Disabled"); 3829 #endif // INCLUDE_CDS 3830 3831 return JNI_OK; 3832 } 3833 3834 jint Arguments::apply_ergo() { 3835 3836 // Set flags based on ergonomics. 3837 set_ergonomics_flags(); 3838 3839 set_shared_spaces_flags(); 3840 3841 // Check the GC selections again. 3842 if (!check_gc_consistency()) { 3843 return JNI_EINVAL; 3844 } 3845 3846 if (TieredCompilation) { 3847 set_tiered_flags(); 3848 } else { 3849 int max_compilation_policy_choice = 1; 3850 #ifdef COMPILER2 3851 max_compilation_policy_choice = 2; 3852 #endif 3853 // Check if the policy is valid. 3854 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 3855 vm_exit_during_initialization( 3856 "Incompatible compilation policy selected", NULL); 3857 } 3858 // Scale CompileThreshold 3859 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 3860 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 3861 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 3862 } 3863 } 3864 3865 #ifdef COMPILER2 3866 #ifndef PRODUCT 3867 if (PrintIdealGraphLevel > 0) { 3868 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 3869 } 3870 #endif 3871 #endif 3872 3873 // Set heap size based on available physical memory 3874 set_heap_size(); 3875 3876 ArgumentsExt::set_gc_specific_flags(); 3877 3878 // Initialize Metaspace flags and alignments 3879 Metaspace::ergo_initialize(); 3880 3881 // Set bytecode rewriting flags 3882 set_bytecode_flags(); 3883 3884 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3885 jint code = set_aggressive_opts_flags(); 3886 if (code != JNI_OK) { 3887 return code; 3888 } 3889 3890 // Turn off biased locking for locking debug mode flags, 3891 // which are subtly different from each other but neither works with 3892 // biased locking 3893 if (UseHeavyMonitors 3894 #ifdef COMPILER1 3895 || !UseFastLocking 3896 #endif // COMPILER1 3897 ) { 3898 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3899 // flag set to true on command line; warn the user that they 3900 // can't enable biased locking here 3901 warning("Biased Locking is not supported with locking debug flags" 3902 "; ignoring UseBiasedLocking flag." ); 3903 } 3904 UseBiasedLocking = false; 3905 } 3906 3907 #ifdef ZERO 3908 // Clear flags not supported on zero. 3909 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3910 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3911 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3912 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3913 #endif // CC_INTERP 3914 3915 #ifdef COMPILER2 3916 if (!EliminateLocks) { 3917 EliminateNestedLocks = false; 3918 } 3919 if (!Inline) { 3920 IncrementalInline = false; 3921 } 3922 #ifndef PRODUCT 3923 if (!IncrementalInline) { 3924 AlwaysIncrementalInline = false; 3925 } 3926 #endif 3927 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 3928 // nothing to use the profiling, turn if off 3929 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 3930 } 3931 #endif 3932 3933 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3934 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3935 DebugNonSafepoints = true; 3936 } 3937 3938 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3939 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3940 } 3941 3942 #ifndef PRODUCT 3943 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3944 if (use_vm_log()) { 3945 LogVMOutput = true; 3946 } 3947 } 3948 #endif // PRODUCT 3949 3950 if (PrintCommandLineFlags) { 3951 CommandLineFlags::printSetFlags(tty); 3952 } 3953 3954 // Apply CPU specific policy for the BiasedLocking 3955 if (UseBiasedLocking) { 3956 if (!VM_Version::use_biased_locking() && 3957 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3958 UseBiasedLocking = false; 3959 } 3960 } 3961 #ifdef COMPILER2 3962 if (!UseBiasedLocking || EmitSync != 0) { 3963 UseOptoBiasInlining = false; 3964 } 3965 #endif 3966 3967 return JNI_OK; 3968 } 3969 3970 jint Arguments::adjust_after_os() { 3971 if (UseNUMA) { 3972 if (UseParallelGC || UseParallelOldGC) { 3973 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3974 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3975 } 3976 } 3977 // UseNUMAInterleaving is set to ON for all collectors and 3978 // platforms when UseNUMA is set to ON. NUMA-aware collectors 3979 // such as the parallel collector for Linux and Solaris will 3980 // interleave old gen and survivor spaces on top of NUMA 3981 // allocation policy for the eden space. 3982 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 3983 // all platforms and ParallelGC on Windows will interleave all 3984 // of the heap spaces across NUMA nodes. 3985 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 3986 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 3987 } 3988 } 3989 return JNI_OK; 3990 } 3991 3992 int Arguments::PropertyList_count(SystemProperty* pl) { 3993 int count = 0; 3994 while(pl != NULL) { 3995 count++; 3996 pl = pl->next(); 3997 } 3998 return count; 3999 } 4000 4001 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4002 assert(key != NULL, "just checking"); 4003 SystemProperty* prop; 4004 for (prop = pl; prop != NULL; prop = prop->next()) { 4005 if (strcmp(key, prop->key()) == 0) return prop->value(); 4006 } 4007 return NULL; 4008 } 4009 4010 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4011 int count = 0; 4012 const char* ret_val = NULL; 4013 4014 while(pl != NULL) { 4015 if(count >= index) { 4016 ret_val = pl->key(); 4017 break; 4018 } 4019 count++; 4020 pl = pl->next(); 4021 } 4022 4023 return ret_val; 4024 } 4025 4026 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4027 int count = 0; 4028 char* ret_val = NULL; 4029 4030 while(pl != NULL) { 4031 if(count >= index) { 4032 ret_val = pl->value(); 4033 break; 4034 } 4035 count++; 4036 pl = pl->next(); 4037 } 4038 4039 return ret_val; 4040 } 4041 4042 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4043 SystemProperty* p = *plist; 4044 if (p == NULL) { 4045 *plist = new_p; 4046 } else { 4047 while (p->next() != NULL) { 4048 p = p->next(); 4049 } 4050 p->set_next(new_p); 4051 } 4052 } 4053 4054 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v) { 4055 if (plist == NULL) 4056 return; 4057 4058 SystemProperty* new_p = new SystemProperty(k, v, true); 4059 PropertyList_add(plist, new_p); 4060 } 4061 4062 void Arguments::PropertyList_add(SystemProperty *element) { 4063 PropertyList_add(&_system_properties, element); 4064 } 4065 4066 // This add maintains unique property key in the list. 4067 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, jboolean append) { 4068 if (plist == NULL) 4069 return; 4070 4071 // If property key exist then update with new value. 4072 SystemProperty* prop; 4073 for (prop = *plist; prop != NULL; prop = prop->next()) { 4074 if (strcmp(k, prop->key()) == 0) { 4075 if (append) { 4076 prop->append_value(v); 4077 } else { 4078 prop->set_value(v); 4079 } 4080 return; 4081 } 4082 } 4083 4084 PropertyList_add(plist, k, v); 4085 } 4086 4087 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4088 // Returns true if all of the source pointed by src has been copied over to 4089 // the destination buffer pointed by buf. Otherwise, returns false. 4090 // Notes: 4091 // 1. If the length (buflen) of the destination buffer excluding the 4092 // NULL terminator character is not long enough for holding the expanded 4093 // pid characters, it also returns false instead of returning the partially 4094 // expanded one. 4095 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4096 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4097 char* buf, size_t buflen) { 4098 const char* p = src; 4099 char* b = buf; 4100 const char* src_end = &src[srclen]; 4101 char* buf_end = &buf[buflen - 1]; 4102 4103 while (p < src_end && b < buf_end) { 4104 if (*p == '%') { 4105 switch (*(++p)) { 4106 case '%': // "%%" ==> "%" 4107 *b++ = *p++; 4108 break; 4109 case 'p': { // "%p" ==> current process id 4110 // buf_end points to the character before the last character so 4111 // that we could write '\0' to the end of the buffer. 4112 size_t buf_sz = buf_end - b + 1; 4113 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4114 4115 // if jio_snprintf fails or the buffer is not long enough to hold 4116 // the expanded pid, returns false. 4117 if (ret < 0 || ret >= (int)buf_sz) { 4118 return false; 4119 } else { 4120 b += ret; 4121 assert(*b == '\0', "fail in copy_expand_pid"); 4122 if (p == src_end && b == buf_end + 1) { 4123 // reach the end of the buffer. 4124 return true; 4125 } 4126 } 4127 p++; 4128 break; 4129 } 4130 default : 4131 *b++ = '%'; 4132 } 4133 } else { 4134 *b++ = *p++; 4135 } 4136 } 4137 *b = '\0'; 4138 return (p == src_end); // return false if not all of the source was copied 4139 }