1 /* 2 * Copyright (c) 1997, 2020, 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 "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/javaAssertions.hpp" 29 #include "classfile/moduleEntry.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "gc/shared/gcArguments.hpp" 33 #include "gc/shared/gcConfig.hpp" 34 #include "logging/log.hpp" 35 #include "logging/logConfiguration.hpp" 36 #include "logging/logStream.hpp" 37 #include "logging/logTag.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/filemap.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "prims/jvmtiExport.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/flags/jvmFlag.hpp" 44 #include "runtime/flags/jvmFlagConstraintList.hpp" 45 #include "runtime/flags/jvmFlagRangeList.hpp" 46 #include "runtime/globals_extension.hpp" 47 #include "runtime/java.hpp" 48 #include "runtime/os.inline.hpp" 49 #include "runtime/safepoint.hpp" 50 #include "runtime/safepointMechanism.hpp" 51 #include "runtime/vm_version.hpp" 52 #include "services/management.hpp" 53 #include "services/memTracker.hpp" 54 #include "utilities/align.hpp" 55 #include "utilities/defaultStream.hpp" 56 #include "utilities/macros.hpp" 57 #include "utilities/powerOfTwo.hpp" 58 #include "utilities/stringUtils.hpp" 59 #if INCLUDE_JFR 60 #include "jfr/jfr.hpp" 61 #endif 62 63 #define DEFAULT_JAVA_LAUNCHER "generic" 64 65 char* Arguments::_jvm_flags_file = NULL; 66 char** Arguments::_jvm_flags_array = NULL; 67 int Arguments::_num_jvm_flags = 0; 68 char** Arguments::_jvm_args_array = NULL; 69 int Arguments::_num_jvm_args = 0; 70 char* Arguments::_java_command = NULL; 71 SystemProperty* Arguments::_system_properties = NULL; 72 const char* Arguments::_gc_log_filename = NULL; 73 size_t Arguments::_conservative_max_heap_alignment = 0; 74 Arguments::Mode Arguments::_mode = _mixed; 75 bool Arguments::_java_compiler = false; 76 bool Arguments::_xdebug_mode = false; 77 const char* Arguments::_java_vendor_url_bug = NULL; 78 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 79 bool Arguments::_sun_java_launcher_is_altjvm = false; 80 81 // These parameters are reset in method parse_vm_init_args() 82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 84 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 85 bool Arguments::_ClipInlining = ClipInlining; 86 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 87 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 88 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 89 90 bool Arguments::_enable_preview = false; 91 92 char* Arguments::SharedArchivePath = NULL; 93 char* Arguments::SharedDynamicArchivePath = NULL; 94 95 AgentLibraryList Arguments::_libraryList; 96 AgentLibraryList Arguments::_agentList; 97 98 // These are not set by the JDK's built-in launchers, but they can be set by 99 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 100 // JavaVMOption in jni.h. 101 abort_hook_t Arguments::_abort_hook = NULL; 102 exit_hook_t Arguments::_exit_hook = NULL; 103 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 104 105 106 SystemProperty *Arguments::_sun_boot_library_path = NULL; 107 SystemProperty *Arguments::_java_library_path = NULL; 108 SystemProperty *Arguments::_java_home = NULL; 109 SystemProperty *Arguments::_java_class_path = NULL; 110 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 111 SystemProperty *Arguments::_vm_info = NULL; 112 113 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 114 PathString *Arguments::_system_boot_class_path = NULL; 115 bool Arguments::_has_jimage = false; 116 117 char* Arguments::_ext_dirs = NULL; 118 119 bool PathString::set_value(const char *value) { 120 if (_value != NULL) { 121 FreeHeap(_value); 122 } 123 _value = AllocateHeap(strlen(value)+1, mtArguments); 124 assert(_value != NULL, "Unable to allocate space for new path value"); 125 if (_value != NULL) { 126 strcpy(_value, value); 127 } else { 128 // not able to allocate 129 return false; 130 } 131 return true; 132 } 133 134 void PathString::append_value(const char *value) { 135 char *sp; 136 size_t len = 0; 137 if (value != NULL) { 138 len = strlen(value); 139 if (_value != NULL) { 140 len += strlen(_value); 141 } 142 sp = AllocateHeap(len+2, mtArguments); 143 assert(sp != NULL, "Unable to allocate space for new append path value"); 144 if (sp != NULL) { 145 if (_value != NULL) { 146 strcpy(sp, _value); 147 strcat(sp, os::path_separator()); 148 strcat(sp, value); 149 FreeHeap(_value); 150 } else { 151 strcpy(sp, value); 152 } 153 _value = sp; 154 } 155 } 156 } 157 158 PathString::PathString(const char* value) { 159 if (value == NULL) { 160 _value = NULL; 161 } else { 162 _value = AllocateHeap(strlen(value)+1, mtArguments); 163 strcpy(_value, value); 164 } 165 } 166 167 PathString::~PathString() { 168 if (_value != NULL) { 169 FreeHeap(_value); 170 _value = NULL; 171 } 172 } 173 174 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 175 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 176 size_t len = strlen(module_name) + 1; 177 _module_name = AllocateHeap(len, mtInternal); 178 strncpy(_module_name, module_name, len); // copy the trailing null 179 _path = new PathString(path); 180 } 181 182 ModulePatchPath::~ModulePatchPath() { 183 if (_module_name != NULL) { 184 FreeHeap(_module_name); 185 _module_name = NULL; 186 } 187 if (_path != NULL) { 188 delete _path; 189 _path = NULL; 190 } 191 } 192 193 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 194 if (key == NULL) { 195 _key = NULL; 196 } else { 197 _key = AllocateHeap(strlen(key)+1, mtArguments); 198 strcpy(_key, key); 199 } 200 _next = NULL; 201 _internal = internal; 202 _writeable = writeable; 203 } 204 205 AgentLibrary::AgentLibrary(const char* name, const char* options, 206 bool is_absolute_path, void* os_lib, 207 bool instrument_lib) { 208 _name = AllocateHeap(strlen(name)+1, mtArguments); 209 strcpy(_name, name); 210 if (options == NULL) { 211 _options = NULL; 212 } else { 213 _options = AllocateHeap(strlen(options)+1, mtArguments); 214 strcpy(_options, options); 215 } 216 _is_absolute_path = is_absolute_path; 217 _os_lib = os_lib; 218 _next = NULL; 219 _state = agent_invalid; 220 _is_static_lib = false; 221 _is_instrument_lib = instrument_lib; 222 } 223 224 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 225 // part of the option string. 226 static bool match_option(const JavaVMOption *option, const char* name, 227 const char** tail) { 228 size_t len = strlen(name); 229 if (strncmp(option->optionString, name, len) == 0) { 230 *tail = option->optionString + len; 231 return true; 232 } else { 233 return false; 234 } 235 } 236 237 // Check if 'option' matches 'name'. No "tail" is allowed. 238 static bool match_option(const JavaVMOption *option, const char* name) { 239 const char* tail = NULL; 240 bool result = match_option(option, name, &tail); 241 if (tail != NULL && *tail == '\0') { 242 return result; 243 } else { 244 return false; 245 } 246 } 247 248 // Return true if any of the strings in null-terminated array 'names' matches. 249 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 250 // the option must match exactly. 251 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 252 bool tail_allowed) { 253 for (/* empty */; *names != NULL; ++names) { 254 if (match_option(option, *names, tail)) { 255 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 256 return true; 257 } 258 } 259 } 260 return false; 261 } 262 263 #if INCLUDE_JFR 264 static bool _has_jfr_option = false; // is using JFR 265 266 // return true on failure 267 static bool match_jfr_option(const JavaVMOption** option) { 268 assert((*option)->optionString != NULL, "invariant"); 269 char* tail = NULL; 270 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 271 _has_jfr_option = true; 272 return Jfr::on_start_flight_recording_option(option, tail); 273 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 274 _has_jfr_option = true; 275 return Jfr::on_flight_recorder_option(option, tail); 276 } 277 return false; 278 } 279 280 bool Arguments::has_jfr_option() { 281 return _has_jfr_option; 282 } 283 #endif 284 285 static void logOption(const char* opt) { 286 if (PrintVMOptions) { 287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 288 } 289 } 290 291 bool needs_module_property_warning = false; 292 293 #define MODULE_PROPERTY_PREFIX "jdk.module." 294 #define MODULE_PROPERTY_PREFIX_LEN 11 295 #define ADDEXPORTS "addexports" 296 #define ADDEXPORTS_LEN 10 297 #define ADDREADS "addreads" 298 #define ADDREADS_LEN 8 299 #define ADDOPENS "addopens" 300 #define ADDOPENS_LEN 8 301 #define PATCH "patch" 302 #define PATCH_LEN 5 303 #define ADDMODS "addmods" 304 #define ADDMODS_LEN 7 305 #define LIMITMODS "limitmods" 306 #define LIMITMODS_LEN 9 307 #define PATH "path" 308 #define PATH_LEN 4 309 #define UPGRADE_PATH "upgrade.path" 310 #define UPGRADE_PATH_LEN 12 311 312 void Arguments::add_init_library(const char* name, char* options) { 313 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 314 } 315 316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 318 } 319 320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 322 } 323 324 // Late-binding agents not started via arguments 325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 326 _agentList.add(agentLib); 327 } 328 329 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 330 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 331 return ((strncmp(option, property, len) == 0) && 332 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 333 } 334 335 // Return true if property starts with "jdk.module." and its ensuing chars match 336 // any of the reserved module properties. 337 // property should be passed without the leading "-D". 338 bool Arguments::is_internal_module_property(const char* property) { 339 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 340 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 341 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 342 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 343 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 344 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 345 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 346 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 347 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 348 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 349 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 350 return true; 351 } 352 } 353 return false; 354 } 355 356 // Process java launcher properties. 357 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 358 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 359 // Must do this before setting up other system properties, 360 // as some of them may depend on launcher type. 361 for (int index = 0; index < args->nOptions; index++) { 362 const JavaVMOption* option = args->options + index; 363 const char* tail; 364 365 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 366 process_java_launcher_argument(tail, option->extraInfo); 367 continue; 368 } 369 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 370 if (strcmp(tail, "true") == 0) { 371 _sun_java_launcher_is_altjvm = true; 372 } 373 continue; 374 } 375 } 376 } 377 378 // Initialize system properties key and value. 379 void Arguments::init_system_properties() { 380 381 // Set up _system_boot_class_path which is not a property but 382 // relies heavily on argument processing and the jdk.boot.class.path.append 383 // property. It is used to store the underlying system boot class path. 384 _system_boot_class_path = new PathString(NULL); 385 386 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 387 "Java Virtual Machine Specification", false)); 388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 390 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 391 392 // Initialize the vm.info now, but it will need updating after argument parsing. 393 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 394 395 // Following are JVMTI agent writable properties. 396 // Properties values are set to NULL and they are 397 // os specific they are initialized in os::init_system_properties_values(). 398 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 399 _java_library_path = new SystemProperty("java.library.path", NULL, true); 400 _java_home = new SystemProperty("java.home", NULL, true); 401 _java_class_path = new SystemProperty("java.class.path", "", true); 402 // jdk.boot.class.path.append is a non-writeable, internal property. 403 // It can only be set by either: 404 // - -Xbootclasspath/a: 405 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 406 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 407 408 // Add to System Property list. 409 PropertyList_add(&_system_properties, _sun_boot_library_path); 410 PropertyList_add(&_system_properties, _java_library_path); 411 PropertyList_add(&_system_properties, _java_home); 412 PropertyList_add(&_system_properties, _java_class_path); 413 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 414 PropertyList_add(&_system_properties, _vm_info); 415 416 // Set OS specific system properties values 417 os::init_system_properties_values(); 418 } 419 420 // Update/Initialize System properties after JDK version number is known 421 void Arguments::init_version_specific_system_properties() { 422 enum { bufsz = 16 }; 423 char buffer[bufsz]; 424 const char* spec_vendor = "Oracle Corporation"; 425 uint32_t spec_version = JDK_Version::current().major_version(); 426 427 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 428 429 PropertyList_add(&_system_properties, 430 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 431 PropertyList_add(&_system_properties, 432 new SystemProperty("java.vm.specification.version", buffer, false)); 433 PropertyList_add(&_system_properties, 434 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 435 } 436 437 /* 438 * -XX argument processing: 439 * 440 * -XX arguments are defined in several places, such as: 441 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 442 * -XX arguments are parsed in parse_argument(). 443 * -XX argument bounds checking is done in check_vm_args_consistency(). 444 * 445 * Over time -XX arguments may change. There are mechanisms to handle common cases: 446 * 447 * ALIASED: An option that is simply another name for another option. This is often 448 * part of the process of deprecating a flag, but not all aliases need 449 * to be deprecated. 450 * 451 * Create an alias for an option by adding the old and new option names to the 452 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 453 * 454 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 455 * support may be removed in the future. Both regular and aliased options may be 456 * deprecated. 457 * 458 * Add a deprecation warning for an option (or alias) by adding an entry in the 459 * "special_jvm_flags" table and setting the "deprecated_in" field. 460 * Often an option "deprecated" in one major release will 461 * be made "obsolete" in the next. In this case the entry should also have its 462 * "obsolete_in" field set. 463 * 464 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 465 * on the command line. A warning is printed to let the user know that option might not 466 * be accepted in the future. 467 * 468 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 469 * table and setting the "obsolete_in" field. 470 * 471 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 472 * to the current JDK version. The system will flatly refuse to admit the existence of 473 * the flag. This allows a flag to die automatically over JDK releases. 474 * 475 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 476 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 477 * - Newly obsolete or expired deprecated options should have their global variable 478 * definitions removed (from globals.hpp, etc) and related implementations removed. 479 * 480 * Recommended approach for removing options: 481 * 482 * To remove options commonly used by customers (e.g. product -XX options), use 483 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 484 * 485 * To remove internal options (e.g. diagnostic, experimental, develop options), use 486 * a 2-step model adding major release numbers to the obsolete and expire columns. 487 * 488 * To change the name of an option, use the alias table as well as a 2-step 489 * model adding major release numbers to the deprecate and expire columns. 490 * Think twice about aliasing commonly used customer options. 491 * 492 * There are times when it is appropriate to leave a future release number as undefined. 493 * 494 * Tests: Aliases should be tested in VMAliasOptions.java. 495 * Deprecated options should be tested in VMDeprecatedOptions.java. 496 */ 497 498 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 499 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 500 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 501 // the command-line as usual, but will issue a warning. 502 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 503 // the command-line, while issuing a warning and ignoring the flag value. 504 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 505 // existence of the flag. 506 // 507 // MANUAL CLEANUP ON JDK VERSION UPDATES: 508 // This table ensures that the handling of options will update automatically when the JDK 509 // version is incremented, but the source code needs to be cleanup up manually: 510 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 511 // variable should be removed, as well as users of the variable. 512 // - As "deprecated" options age into "obsolete" options, move the entry into the 513 // "Obsolete Flags" section of the table. 514 // - All expired options should be removed from the table. 515 static SpecialFlag const special_jvm_flags[] = { 516 // -------------- Deprecated Flags -------------- 517 // --- Non-alias flags - sorted by obsolete_in then expired_in: 518 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 519 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 520 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 521 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 522 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() }, 523 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 524 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 525 { "UseBiasedLocking", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 526 { "BiasedLockingStartupDelay", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 527 { "PrintBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 528 { "BiasedLockingBulkRebiasThreshold", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 529 { "BiasedLockingBulkRevokeThreshold", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 530 { "BiasedLockingDecayTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 531 { "UseOptoBiasInlining", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 532 { "PrintPreciseBiasedLockingStatistics", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 533 { "InitialBootClassLoaderMetaspaceSize", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 534 { "UseLargePagesInMetaspace", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 535 536 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 537 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 538 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 539 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 540 541 // -------------- Obsolete Flags - sorted by expired_in -------------- 542 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 543 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 544 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 545 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 546 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 547 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 548 #ifdef BSD 549 { "UseBsdPosixThreadCPUClocks", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 550 { "UseOprofile", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 551 #endif 552 { "PrintVMQWaitTime", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 553 { "UseNewFieldLayout", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 554 { "UseSemaphoreGCThreadsSynchronization", JDK_Version::undefined(), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 555 { "ForceNUMA", JDK_Version::jdk(15), JDK_Version::jdk(16), JDK_Version::jdk(17) }, 556 557 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 558 // These entries will generate build errors. Their purpose is to test the macros. 559 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 560 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 561 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 562 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 563 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 564 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 565 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 566 #endif 567 568 #ifndef COMPILER2 569 // These flags were generally available, but are C2 only, now. 570 { "MaxInlineLevel", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 571 { "MaxRecursiveInlineLevel", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 572 { "InlineSmallCode", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 573 { "MaxInlineSize", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 574 { "FreqInlineSize", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 575 { "MaxTrivialSize", JDK_Version::undefined(), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 576 #endif 577 578 { NULL, JDK_Version(0), JDK_Version(0) } 579 }; 580 581 // Flags that are aliases for other flags. 582 typedef struct { 583 const char* alias_name; 584 const char* real_name; 585 } AliasedFlag; 586 587 static AliasedFlag const aliased_jvm_flags[] = { 588 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 589 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 590 { NULL, NULL} 591 }; 592 593 // NOTE: A compatibility request will be necessary for each alias to be removed. 594 static AliasedLoggingFlag const aliased_logging_flags[] = { 595 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 596 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 597 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 598 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 599 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 600 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 601 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 602 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 603 { "TraceInvokeDynamic", LogLevel::Debug, true, LOG_TAGS(methodhandles, indy) }, 604 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 605 { "TraceMethodHandles", LogLevel::Info, true, LOG_TAGS(methodhandles) }, 606 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) }, 607 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 608 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 609 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 610 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) }, 611 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 612 }; 613 614 #ifndef PRODUCT 615 // These options are removed in jdk9. Remove this code for jdk10. 616 static AliasedFlag const removed_develop_logging_flags[] = { 617 { "TraceClassInitialization", "-Xlog:class+init" }, 618 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 619 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 620 { "TraceItables", "-Xlog:itables=debug" }, 621 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 622 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 623 { "TraceStartupTime", "-Xlog:startuptime" }, 624 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 625 { "PrintVtables", "-Xlog:vtables=debug" }, 626 { "VerboseVerification", "-Xlog:verification" }, 627 { NULL, NULL } 628 }; 629 #endif //PRODUCT 630 631 // Return true if "v" is less than "other", where "other" may be "undefined". 632 static bool version_less_than(JDK_Version v, JDK_Version other) { 633 assert(!v.is_undefined(), "must be defined"); 634 if (!other.is_undefined() && v.compare(other) >= 0) { 635 return false; 636 } else { 637 return true; 638 } 639 } 640 641 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 642 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 643 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 644 flag = special_jvm_flags[i]; 645 return true; 646 } 647 } 648 return false; 649 } 650 651 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 652 assert(version != NULL, "Must provide a version buffer"); 653 SpecialFlag flag; 654 if (lookup_special_flag(flag_name, flag)) { 655 if (!flag.obsolete_in.is_undefined()) { 656 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 657 *version = flag.obsolete_in; 658 // This flag may have been marked for obsoletion in this version, but we may not 659 // have actually removed it yet. Rather than ignoring it as soon as we reach 660 // this version we allow some time for the removal to happen. So if the flag 661 // still actually exists we process it as normal, but issue an adjusted warning. 662 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 663 if (real_flag != NULL) { 664 char version_str[256]; 665 version->to_string(version_str, sizeof(version_str)); 666 warning("Temporarily processing option %s; support is scheduled for removal in %s", 667 flag_name, version_str); 668 return false; 669 } 670 return true; 671 } 672 } 673 } 674 return false; 675 } 676 677 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 678 assert(version != NULL, "Must provide a version buffer"); 679 SpecialFlag flag; 680 if (lookup_special_flag(flag_name, flag)) { 681 if (!flag.deprecated_in.is_undefined()) { 682 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 683 version_less_than(JDK_Version::current(), flag.expired_in)) { 684 *version = flag.deprecated_in; 685 return 1; 686 } else { 687 return -1; 688 } 689 } 690 } 691 return 0; 692 } 693 694 #ifndef PRODUCT 695 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 696 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 697 const AliasedFlag& flag = removed_develop_logging_flags[i]; 698 if (strcmp(flag.alias_name, name) == 0) { 699 return flag.real_name; 700 } 701 } 702 return NULL; 703 } 704 #endif // PRODUCT 705 706 const char* Arguments::real_flag_name(const char *flag_name) { 707 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 708 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 709 if (strcmp(flag_status.alias_name, flag_name) == 0) { 710 return flag_status.real_name; 711 } 712 } 713 return flag_name; 714 } 715 716 #ifdef ASSERT 717 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 718 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 719 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 720 return true; 721 } 722 } 723 return false; 724 } 725 726 // Verifies the correctness of the entries in the special_jvm_flags table. 727 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 728 // version being earlier than the deprecation version, then a warning is issued 729 // and verification fails - by returning false. If it is detected that the table 730 // is out of date, with respect to the current version, then ideally a warning is 731 // issued but verification does not fail. This allows the VM to operate when the 732 // version is first updated, without needing to update all the impacted flags at 733 // the same time. In practice we can't issue the warning immediately when the version 734 // is updated as it occurs for every test and some tests are not prepared to handle 735 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 736 // if the check_globals flag is true, and in addition allow a grace period and only 737 // check for stale flags when we hit build 25 (which is far enough into the 6 month 738 // release cycle that all flag updates should have been processed, whilst still 739 // leaving time to make the change before RDP2). 740 // We use a gtest to call this, passing true, so that we can detect stale flags before 741 // the end of the release cycle. 742 743 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 744 745 bool Arguments::verify_special_jvm_flags(bool check_globals) { 746 bool success = true; 747 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 748 const SpecialFlag& flag = special_jvm_flags[i]; 749 if (lookup_special_flag(flag.name, i)) { 750 warning("Duplicate special flag declaration \"%s\"", flag.name); 751 success = false; 752 } 753 if (flag.deprecated_in.is_undefined() && 754 flag.obsolete_in.is_undefined()) { 755 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 756 success = false; 757 } 758 759 if (!flag.deprecated_in.is_undefined()) { 760 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 761 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 762 success = false; 763 } 764 765 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 766 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 767 success = false; 768 } 769 } 770 771 if (!flag.obsolete_in.is_undefined()) { 772 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 773 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 774 success = false; 775 } 776 777 // if flag has become obsolete it should not have a "globals" flag defined anymore. 778 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 779 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 780 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 781 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 782 success = false; 783 } 784 } 785 786 } else if (!flag.expired_in.is_undefined()) { 787 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 788 success = false; 789 } 790 791 if (!flag.expired_in.is_undefined()) { 792 // if flag has become expired it should not have a "globals" flag defined anymore. 793 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 794 !version_less_than(JDK_Version::current(), flag.expired_in)) { 795 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 796 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 797 success = false; 798 } 799 } 800 } 801 } 802 return success; 803 } 804 #endif 805 806 // Parses a size specification string. 807 bool Arguments::atojulong(const char *s, julong* result) { 808 julong n = 0; 809 810 // First char must be a digit. Don't allow negative numbers or leading spaces. 811 if (!isdigit(*s)) { 812 return false; 813 } 814 815 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 816 char* remainder; 817 errno = 0; 818 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 819 if (errno != 0) { 820 return false; 821 } 822 823 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 824 if (remainder == s || strlen(remainder) > 1) { 825 return false; 826 } 827 828 switch (*remainder) { 829 case 'T': case 't': 830 *result = n * G * K; 831 // Check for overflow. 832 if (*result/((julong)G * K) != n) return false; 833 return true; 834 case 'G': case 'g': 835 *result = n * G; 836 if (*result/G != n) return false; 837 return true; 838 case 'M': case 'm': 839 *result = n * M; 840 if (*result/M != n) return false; 841 return true; 842 case 'K': case 'k': 843 *result = n * K; 844 if (*result/K != n) return false; 845 return true; 846 case '\0': 847 *result = n; 848 return true; 849 default: 850 return false; 851 } 852 } 853 854 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 855 if (size < min_size) return arg_too_small; 856 if (size > max_size) return arg_too_big; 857 return arg_in_range; 858 } 859 860 // Describe an argument out of range error 861 void Arguments::describe_range_error(ArgsRange errcode) { 862 switch(errcode) { 863 case arg_too_big: 864 jio_fprintf(defaultStream::error_stream(), 865 "The specified size exceeds the maximum " 866 "representable size.\n"); 867 break; 868 case arg_too_small: 869 case arg_unreadable: 870 case arg_in_range: 871 // do nothing for now 872 break; 873 default: 874 ShouldNotReachHere(); 875 } 876 } 877 878 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) { 879 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) { 880 return true; 881 } else { 882 return false; 883 } 884 } 885 886 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 887 char* end; 888 errno = 0; 889 double v = strtod(value, &end); 890 if ((errno != 0) || (*end != 0)) { 891 return false; 892 } 893 894 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) { 895 return true; 896 } 897 return false; 898 } 899 900 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 901 julong v; 902 int int_v; 903 intx intx_v; 904 bool is_neg = false; 905 906 if (flag == NULL) { 907 return false; 908 } 909 910 // Check the sign first since atojulong() parses only unsigned values. 911 if (*value == '-') { 912 if (!flag->is_intx() && !flag->is_int()) { 913 return false; 914 } 915 value++; 916 is_neg = true; 917 } 918 if (!Arguments::atojulong(value, &v)) { 919 return false; 920 } 921 if (flag->is_int()) { 922 int_v = (int) v; 923 if (is_neg) { 924 int_v = -int_v; 925 } 926 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS; 927 } else if (flag->is_uint()) { 928 uint uint_v = (uint) v; 929 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS; 930 } else if (flag->is_intx()) { 931 intx_v = (intx) v; 932 if (is_neg) { 933 intx_v = -intx_v; 934 } 935 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS; 936 } else if (flag->is_uintx()) { 937 uintx uintx_v = (uintx) v; 938 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS; 939 } else if (flag->is_uint64_t()) { 940 uint64_t uint64_t_v = (uint64_t) v; 941 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS; 942 } else if (flag->is_size_t()) { 943 size_t size_t_v = (size_t) v; 944 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS; 945 } else if (flag->is_double()) { 946 double double_v = (double) v; 947 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS; 948 } else { 949 return false; 950 } 951 } 952 953 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) { 954 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false; 955 // Contract: JVMFlag always returns a pointer that needs freeing. 956 FREE_C_HEAP_ARRAY(char, value); 957 return true; 958 } 959 960 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) { 961 const char* old_value = ""; 962 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false; 963 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 964 size_t new_len = strlen(new_value); 965 const char* value; 966 char* free_this_too = NULL; 967 if (old_len == 0) { 968 value = new_value; 969 } else if (new_len == 0) { 970 value = old_value; 971 } else { 972 size_t length = old_len + 1 + new_len + 1; 973 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 974 // each new setting adds another LINE to the switch: 975 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 976 value = buf; 977 free_this_too = buf; 978 } 979 (void) JVMFlag::ccstrAtPut(flag, &value, origin); 980 // JVMFlag always returns a pointer that needs freeing. 981 FREE_C_HEAP_ARRAY(char, value); 982 // JVMFlag made its own copy, so I must delete my own temp. buffer. 983 FREE_C_HEAP_ARRAY(char, free_this_too); 984 return true; 985 } 986 987 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 988 const char* real_name = real_flag_name(arg); 989 JDK_Version since = JDK_Version(); 990 switch (is_deprecated_flag(arg, &since)) { 991 case -1: { 992 // Obsolete or expired, so don't process normally, 993 // but allow for an obsolete flag we're still 994 // temporarily allowing. 995 if (!is_obsolete_flag(arg, &since)) { 996 return real_name; 997 } 998 // Note if we're not considered obsolete then we can't be expired either 999 // as obsoletion must come first. 1000 return NULL; 1001 } 1002 case 0: 1003 return real_name; 1004 case 1: { 1005 if (warn) { 1006 char version[256]; 1007 since.to_string(version, sizeof(version)); 1008 if (real_name != arg) { 1009 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 1010 arg, version, real_name); 1011 } else { 1012 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 1013 arg, version); 1014 } 1015 } 1016 return real_name; 1017 } 1018 } 1019 ShouldNotReachHere(); 1020 return NULL; 1021 } 1022 1023 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 1024 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 1025 // Set tagset string buffer at max size of 256, large enough for any alias tagset 1026 const int max_tagset_size = 256; 1027 int max_tagset_len = max_tagset_size - 1; 1028 char tagset_buffer[max_tagset_size]; 1029 tagset_buffer[0] = '\0'; 1030 1031 // Write tag-set for aliased logging option, in string list form 1032 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 1033 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 1034 if (i > 0) { 1035 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 1036 } 1037 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 1038 } 1039 if (!alf.exactMatch) { 1040 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 1041 } 1042 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 1043 (on) ? "+" : "-", 1044 name, 1045 tagset_buffer, 1046 (on) ? LogLevel::name(alf.level) : "off"); 1047 } 1048 1049 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 1050 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 1051 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1052 if (strcmp(alf.alias_name, name) == 0) { 1053 log_deprecated_flag(name, on, alf); 1054 return alf; 1055 } 1056 } 1057 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1058 return a; 1059 } 1060 1061 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) { 1062 1063 // range of acceptable characters spelled out for portability reasons 1064 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1065 #define BUFLEN 255 1066 char name[BUFLEN+1]; 1067 char dummy; 1068 const char* real_name; 1069 bool warn_if_deprecated = true; 1070 1071 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1072 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1073 if (alf.alias_name != NULL){ 1074 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1075 return true; 1076 } 1077 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1078 if (real_name == NULL) { 1079 return false; 1080 } 1081 JVMFlag* flag = JVMFlag::find_flag(real_name); 1082 return set_bool_flag(flag, false, origin); 1083 } 1084 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1085 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1086 if (alf.alias_name != NULL){ 1087 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1088 return true; 1089 } 1090 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1091 if (real_name == NULL) { 1092 return false; 1093 } 1094 JVMFlag* flag = JVMFlag::find_flag(real_name); 1095 return set_bool_flag(flag, true, origin); 1096 } 1097 1098 char punct; 1099 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1100 const char* value = strchr(arg, '=') + 1; 1101 1102 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1103 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1104 if (alf.alias_name != NULL) { 1105 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1106 return true; 1107 } 1108 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1109 if (real_name == NULL) { 1110 return false; 1111 } 1112 JVMFlag* flag = JVMFlag::find_flag(real_name); 1113 if (flag != NULL && flag->is_ccstr()) { 1114 if (flag->ccstr_accumulates()) { 1115 return append_to_string_flag(flag, value, origin); 1116 } else { 1117 if (value[0] == '\0') { 1118 value = NULL; 1119 } 1120 return set_string_flag(flag, value, origin); 1121 } 1122 } else { 1123 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1124 } 1125 } 1126 1127 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1128 const char* value = strchr(arg, '=') + 1; 1129 // -XX:Foo:=xxx will reset the string flag to the given value. 1130 if (value[0] == '\0') { 1131 value = NULL; 1132 } 1133 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1134 if (real_name == NULL) { 1135 return false; 1136 } 1137 JVMFlag* flag = JVMFlag::find_flag(real_name); 1138 return set_string_flag(flag, value, origin); 1139 } 1140 1141 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1142 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1143 #define NUMBER_RANGE "[0123456789eE+-]" 1144 char value[BUFLEN + 1]; 1145 char value2[BUFLEN + 1]; 1146 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1147 // Looks like a floating-point number -- try again with more lenient format string 1148 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1149 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1150 if (real_name == NULL) { 1151 return false; 1152 } 1153 JVMFlag* flag = JVMFlag::find_flag(real_name); 1154 return set_fp_numeric_flag(flag, value, origin); 1155 } 1156 } 1157 1158 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1159 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1160 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1161 if (real_name == NULL) { 1162 return false; 1163 } 1164 JVMFlag* flag = JVMFlag::find_flag(real_name); 1165 return set_numeric_flag(flag, value, origin); 1166 } 1167 1168 return false; 1169 } 1170 1171 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1172 assert(bldarray != NULL, "illegal argument"); 1173 1174 if (arg == NULL) { 1175 return; 1176 } 1177 1178 int new_count = *count + 1; 1179 1180 // expand the array and add arg to the last element 1181 if (*bldarray == NULL) { 1182 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1183 } else { 1184 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1185 } 1186 (*bldarray)[*count] = os::strdup_check_oom(arg); 1187 *count = new_count; 1188 } 1189 1190 void Arguments::build_jvm_args(const char* arg) { 1191 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1192 } 1193 1194 void Arguments::build_jvm_flags(const char* arg) { 1195 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1196 } 1197 1198 // utility function to return a string that concatenates all 1199 // strings in a given char** array 1200 const char* Arguments::build_resource_string(char** args, int count) { 1201 if (args == NULL || count == 0) { 1202 return NULL; 1203 } 1204 size_t length = 0; 1205 for (int i = 0; i < count; i++) { 1206 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1207 } 1208 char* s = NEW_RESOURCE_ARRAY(char, length); 1209 char* dst = s; 1210 for (int j = 0; j < count; j++) { 1211 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1212 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1213 dst += offset; 1214 length -= offset; 1215 } 1216 return (const char*) s; 1217 } 1218 1219 void Arguments::print_on(outputStream* st) { 1220 st->print_cr("VM Arguments:"); 1221 if (num_jvm_flags() > 0) { 1222 st->print("jvm_flags: "); print_jvm_flags_on(st); 1223 st->cr(); 1224 } 1225 if (num_jvm_args() > 0) { 1226 st->print("jvm_args: "); print_jvm_args_on(st); 1227 st->cr(); 1228 } 1229 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1230 if (_java_class_path != NULL) { 1231 char* path = _java_class_path->value(); 1232 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1233 } 1234 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1235 } 1236 1237 void Arguments::print_summary_on(outputStream* st) { 1238 // Print the command line. Environment variables that are helpful for 1239 // reproducing the problem are written later in the hs_err file. 1240 // flags are from setting file 1241 if (num_jvm_flags() > 0) { 1242 st->print_raw("Settings File: "); 1243 print_jvm_flags_on(st); 1244 st->cr(); 1245 } 1246 // args are the command line and environment variable arguments. 1247 st->print_raw("Command Line: "); 1248 if (num_jvm_args() > 0) { 1249 print_jvm_args_on(st); 1250 } 1251 // this is the classfile and any arguments to the java program 1252 if (java_command() != NULL) { 1253 st->print("%s", java_command()); 1254 } 1255 st->cr(); 1256 } 1257 1258 void Arguments::print_jvm_flags_on(outputStream* st) { 1259 if (_num_jvm_flags > 0) { 1260 for (int i=0; i < _num_jvm_flags; i++) { 1261 st->print("%s ", _jvm_flags_array[i]); 1262 } 1263 } 1264 } 1265 1266 void Arguments::print_jvm_args_on(outputStream* st) { 1267 if (_num_jvm_args > 0) { 1268 for (int i=0; i < _num_jvm_args; i++) { 1269 st->print("%s ", _jvm_args_array[i]); 1270 } 1271 } 1272 } 1273 1274 bool Arguments::process_argument(const char* arg, 1275 jboolean ignore_unrecognized, 1276 JVMFlag::Flags origin) { 1277 JDK_Version since = JDK_Version(); 1278 1279 if (parse_argument(arg, origin)) { 1280 return true; 1281 } 1282 1283 // Determine if the flag has '+', '-', or '=' characters. 1284 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1285 const char* const argname = has_plus_minus ? arg + 1 : arg; 1286 1287 size_t arg_len; 1288 const char* equal_sign = strchr(argname, '='); 1289 if (equal_sign == NULL) { 1290 arg_len = strlen(argname); 1291 } else { 1292 arg_len = equal_sign - argname; 1293 } 1294 1295 // Only make the obsolete check for valid arguments. 1296 if (arg_len <= BUFLEN) { 1297 // Construct a string which consists only of the argument name without '+', '-', or '='. 1298 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1299 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1300 if (is_obsolete_flag(stripped_argname, &since)) { 1301 char version[256]; 1302 since.to_string(version, sizeof(version)); 1303 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1304 return true; 1305 } 1306 #ifndef PRODUCT 1307 else { 1308 const char* replacement; 1309 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1310 log_warning(arguments)("%s has been removed. Please use %s instead.", 1311 stripped_argname, 1312 replacement); 1313 return false; 1314 } 1315 } 1316 #endif //PRODUCT 1317 } 1318 1319 // For locked flags, report a custom error message if available. 1320 // Otherwise, report the standard unrecognized VM option. 1321 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1322 if (found_flag != NULL) { 1323 char locked_message_buf[BUFLEN]; 1324 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1325 if (strlen(locked_message_buf) == 0) { 1326 if (found_flag->is_bool() && !has_plus_minus) { 1327 jio_fprintf(defaultStream::error_stream(), 1328 "Missing +/- setting for VM option '%s'\n", argname); 1329 } else if (!found_flag->is_bool() && has_plus_minus) { 1330 jio_fprintf(defaultStream::error_stream(), 1331 "Unexpected +/- setting in VM option '%s'\n", argname); 1332 } else { 1333 jio_fprintf(defaultStream::error_stream(), 1334 "Improperly specified VM option '%s'\n", argname); 1335 } 1336 } else { 1337 #ifdef PRODUCT 1338 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1339 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1340 if (ignore_unrecognized && mismatched) { 1341 return true; 1342 } 1343 #endif 1344 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1345 } 1346 } else { 1347 if (ignore_unrecognized) { 1348 return true; 1349 } 1350 jio_fprintf(defaultStream::error_stream(), 1351 "Unrecognized VM option '%s'\n", argname); 1352 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1353 if (fuzzy_matched != NULL) { 1354 jio_fprintf(defaultStream::error_stream(), 1355 "Did you mean '%s%s%s'? ", 1356 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1357 fuzzy_matched->_name, 1358 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1359 } 1360 } 1361 1362 // allow for commandline "commenting out" options like -XX:#+Verbose 1363 return arg[0] == '#'; 1364 } 1365 1366 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1367 FILE* stream = fopen(file_name, "rb"); 1368 if (stream == NULL) { 1369 if (should_exist) { 1370 jio_fprintf(defaultStream::error_stream(), 1371 "Could not open settings file %s\n", file_name); 1372 return false; 1373 } else { 1374 return true; 1375 } 1376 } 1377 1378 char token[1024]; 1379 int pos = 0; 1380 1381 bool in_white_space = true; 1382 bool in_comment = false; 1383 bool in_quote = false; 1384 char quote_c = 0; 1385 bool result = true; 1386 1387 int c = getc(stream); 1388 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1389 if (in_white_space) { 1390 if (in_comment) { 1391 if (c == '\n') in_comment = false; 1392 } else { 1393 if (c == '#') in_comment = true; 1394 else if (!isspace(c)) { 1395 in_white_space = false; 1396 token[pos++] = c; 1397 } 1398 } 1399 } else { 1400 if (c == '\n' || (!in_quote && isspace(c))) { 1401 // token ends at newline, or at unquoted whitespace 1402 // this allows a way to include spaces in string-valued options 1403 token[pos] = '\0'; 1404 logOption(token); 1405 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1406 build_jvm_flags(token); 1407 pos = 0; 1408 in_white_space = true; 1409 in_quote = false; 1410 } else if (!in_quote && (c == '\'' || c == '"')) { 1411 in_quote = true; 1412 quote_c = c; 1413 } else if (in_quote && (c == quote_c)) { 1414 in_quote = false; 1415 } else { 1416 token[pos++] = c; 1417 } 1418 } 1419 c = getc(stream); 1420 } 1421 if (pos > 0) { 1422 token[pos] = '\0'; 1423 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1424 build_jvm_flags(token); 1425 } 1426 fclose(stream); 1427 return result; 1428 } 1429 1430 //============================================================================================================= 1431 // Parsing of properties (-D) 1432 1433 const char* Arguments::get_property(const char* key) { 1434 return PropertyList_get_value(system_properties(), key); 1435 } 1436 1437 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1438 const char* eq = strchr(prop, '='); 1439 const char* key; 1440 const char* value = ""; 1441 1442 if (eq == NULL) { 1443 // property doesn't have a value, thus use passed string 1444 key = prop; 1445 } else { 1446 // property have a value, thus extract it and save to the 1447 // allocated string 1448 size_t key_len = eq - prop; 1449 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1450 1451 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1452 key = tmp_key; 1453 1454 value = &prop[key_len + 1]; 1455 } 1456 1457 #if INCLUDE_CDS 1458 if (is_internal_module_property(key) || 1459 strcmp(key, "jdk.module.main") == 0) { 1460 MetaspaceShared::disable_optimized_module_handling(); 1461 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value); 1462 } 1463 if (strcmp(key, "jdk.module.showModuleResolution") == 0 || 1464 strcmp(key, "jdk.module.illegalAccess") == 0 || 1465 strcmp(key, "jdk.module.validation") == 0 || 1466 strcmp(key, "java.system.class.loader") == 0) { 1467 MetaspaceShared::disable_full_module_graph(); 1468 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value); 1469 } 1470 #endif 1471 1472 if (strcmp(key, "java.compiler") == 0) { 1473 process_java_compiler_argument(value); 1474 // Record value in Arguments, but let it get passed to Java. 1475 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1476 // sun.java.launcher.is_altjvm property is 1477 // private and is processed in process_sun_java_launcher_properties(); 1478 // the sun.java.launcher property is passed on to the java application 1479 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1480 // append is true, writable is true, internal is false 1481 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1482 WriteableProperty, ExternalProperty); 1483 } else { 1484 if (strcmp(key, "sun.java.command") == 0) { 1485 char *old_java_command = _java_command; 1486 _java_command = os::strdup_check_oom(value, mtArguments); 1487 if (old_java_command != NULL) { 1488 os::free(old_java_command); 1489 } 1490 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1491 // If this property is set on the command line then its value will be 1492 // displayed in VM error logs as the URL at which to submit such logs. 1493 // Normally the URL displayed in error logs is different from the value 1494 // of this system property, so a different property should have been 1495 // used here, but we leave this as-is in case someone depends upon it. 1496 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1497 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1498 // its value without going through the property list or making a Java call. 1499 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1500 if (old_java_vendor_url_bug != NULL) { 1501 os::free((void *)old_java_vendor_url_bug); 1502 } 1503 } 1504 1505 // Create new property and add at the end of the list 1506 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1507 } 1508 1509 if (key != prop) { 1510 // SystemProperty copy passed value, thus free previously allocated 1511 // memory 1512 FreeHeap((void *)key); 1513 } 1514 1515 return true; 1516 } 1517 1518 #if INCLUDE_CDS 1519 const char* unsupported_properties[] = { "jdk.module.limitmods", 1520 "jdk.module.upgrade.path", 1521 "jdk.module.patch.0" }; 1522 const char* unsupported_options[] = { "--limit-modules", 1523 "--upgrade-module-path", 1524 "--patch-module" 1525 }; 1526 void Arguments::check_unsupported_dumping_properties() { 1527 assert(is_dumping_archive(), 1528 "this function is only used with CDS dump time"); 1529 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1530 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1531 SystemProperty* sp = system_properties(); 1532 while (sp != NULL) { 1533 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1534 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1535 vm_exit_during_initialization( 1536 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1537 } 1538 } 1539 sp = sp->next(); 1540 } 1541 1542 // Check for an exploded module build in use with -Xshare:dump. 1543 if (!has_jimage()) { 1544 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1545 } 1546 } 1547 1548 bool Arguments::check_unsupported_cds_runtime_properties() { 1549 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1550 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1551 if (ArchiveClassesAtExit != NULL) { 1552 // dynamic dumping, just return false for now. 1553 // check_unsupported_dumping_properties() will be called later to check the same set of 1554 // properties, and will exit the VM with the correct error message if the unsupported properties 1555 // are used. 1556 return false; 1557 } 1558 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1559 if (get_property(unsupported_properties[i]) != NULL) { 1560 if (RequireSharedSpaces) { 1561 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1562 } 1563 return true; 1564 } 1565 } 1566 return false; 1567 } 1568 #endif 1569 1570 //=========================================================================================================== 1571 // Setting int/mixed/comp mode flags 1572 1573 void Arguments::set_mode_flags(Mode mode) { 1574 // Set up default values for all flags. 1575 // If you add a flag to any of the branches below, 1576 // add a default value for it here. 1577 set_java_compiler(false); 1578 _mode = mode; 1579 1580 // Ensure Agent_OnLoad has the correct initial values. 1581 // This may not be the final mode; mode may change later in onload phase. 1582 PropertyList_unique_add(&_system_properties, "java.vm.info", 1583 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1584 1585 UseInterpreter = true; 1586 UseCompiler = true; 1587 UseLoopCounter = true; 1588 1589 // Default values may be platform/compiler dependent - 1590 // use the saved values 1591 ClipInlining = Arguments::_ClipInlining; 1592 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1593 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1594 BackgroundCompilation = Arguments::_BackgroundCompilation; 1595 if (TieredCompilation) { 1596 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1597 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1598 } 1599 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1600 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1601 } 1602 } 1603 1604 // Change from defaults based on mode 1605 switch (mode) { 1606 default: 1607 ShouldNotReachHere(); 1608 break; 1609 case _int: 1610 UseCompiler = false; 1611 UseLoopCounter = false; 1612 AlwaysCompileLoopMethods = false; 1613 UseOnStackReplacement = false; 1614 break; 1615 case _mixed: 1616 // same as default 1617 break; 1618 case _comp: 1619 UseInterpreter = false; 1620 BackgroundCompilation = false; 1621 ClipInlining = false; 1622 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1623 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1624 // compile a level 4 (C2) and then continue executing it. 1625 if (TieredCompilation) { 1626 Tier3InvokeNotifyFreqLog = 0; 1627 Tier4InvocationThreshold = 0; 1628 } 1629 break; 1630 } 1631 } 1632 1633 // Conflict: required to use shared spaces (-Xshare:on), but 1634 // incompatible command line options were chosen. 1635 static void no_shared_spaces(const char* message) { 1636 if (RequireSharedSpaces) { 1637 jio_fprintf(defaultStream::error_stream(), 1638 "Class data sharing is inconsistent with other specified options.\n"); 1639 vm_exit_during_initialization("Unable to use shared archive", message); 1640 } else { 1641 log_info(cds)("Unable to use shared archive: %s", message); 1642 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1643 } 1644 } 1645 1646 void set_object_alignment() { 1647 // Object alignment. 1648 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1649 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1650 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1651 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1652 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1653 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1654 1655 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1656 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1657 1658 // Oop encoding heap max 1659 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1660 1661 if (SurvivorAlignmentInBytes == 0) { 1662 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1663 } 1664 } 1665 1666 size_t Arguments::max_heap_for_compressed_oops() { 1667 // Avoid sign flip. 1668 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1669 // We need to fit both the NULL page and the heap into the memory budget, while 1670 // keeping alignment constraints of the heap. To guarantee the latter, as the 1671 // NULL page is located before the heap, we pad the NULL page to the conservative 1672 // maximum alignment that the GC may ever impose upon the heap. 1673 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1674 _conservative_max_heap_alignment); 1675 1676 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1677 NOT_LP64(ShouldNotReachHere(); return 0); 1678 } 1679 1680 void Arguments::set_use_compressed_oops() { 1681 #ifndef ZERO 1682 #ifdef _LP64 1683 // MaxHeapSize is not set up properly at this point, but 1684 // the only value that can override MaxHeapSize if we are 1685 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1686 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1687 1688 if (max_heap_size <= max_heap_for_compressed_oops()) { 1689 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1690 FLAG_SET_ERGO(UseCompressedOops, true); 1691 } 1692 } else { 1693 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1694 warning("Max heap size too large for Compressed Oops"); 1695 FLAG_SET_DEFAULT(UseCompressedOops, false); 1696 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) { 1697 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1698 } 1699 } 1700 } 1701 #endif // _LP64 1702 #endif // ZERO 1703 } 1704 1705 1706 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1707 // set_use_compressed_oops(). 1708 void Arguments::set_use_compressed_klass_ptrs() { 1709 #ifndef ZERO 1710 #ifdef _LP64 1711 // On some architectures, the use of UseCompressedClassPointers implies the use of 1712 // UseCompressedOops. The reason is that the rheap_base register of said platforms 1713 // is reused to perform some optimized spilling, in order to use rheap_base as a 1714 // temp register. But by treating it as any other temp register, spilling can typically 1715 // be completely avoided instead. So it is better not to perform this trick. And by 1716 // not having that reliance, large heaps, or heaps not supporting compressed oops, 1717 // can still use compressed class pointers. 1718 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) { 1719 if (UseCompressedClassPointers) { 1720 warning("UseCompressedClassPointers requires UseCompressedOops"); 1721 } 1722 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1723 } else { 1724 // Turn on UseCompressedClassPointers too 1725 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1726 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1727 } 1728 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1729 if (UseCompressedClassPointers) { 1730 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1731 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1732 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1733 } 1734 } 1735 } 1736 #endif // _LP64 1737 #endif // !ZERO 1738 } 1739 1740 void Arguments::set_conservative_max_heap_alignment() { 1741 // The conservative maximum required alignment for the heap is the maximum of 1742 // the alignments imposed by several sources: any requirements from the heap 1743 // itself and the maximum page size we may run the VM with. 1744 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1745 _conservative_max_heap_alignment = MAX4(heap_alignment, 1746 (size_t)os::vm_allocation_granularity(), 1747 os::max_page_size(), 1748 GCArguments::compute_heap_alignment()); 1749 } 1750 1751 jint Arguments::set_ergonomics_flags() { 1752 GCConfig::initialize(); 1753 1754 set_conservative_max_heap_alignment(); 1755 1756 #ifndef ZERO 1757 #ifdef _LP64 1758 set_use_compressed_oops(); 1759 1760 // set_use_compressed_klass_ptrs() must be called after calling 1761 // set_use_compressed_oops(). 1762 set_use_compressed_klass_ptrs(); 1763 1764 // Also checks that certain machines are slower with compressed oops 1765 // in vm_version initialization code. 1766 #endif // _LP64 1767 #endif // !ZERO 1768 1769 return JNI_OK; 1770 } 1771 1772 julong Arguments::limit_by_allocatable_memory(julong limit) { 1773 julong max_allocatable; 1774 julong result = limit; 1775 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1776 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1777 } 1778 return result; 1779 } 1780 1781 // Use static initialization to get the default before parsing 1782 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1783 1784 void Arguments::set_heap_size() { 1785 julong phys_mem; 1786 1787 // If the user specified one of these options, they 1788 // want specific memory sizing so do not limit memory 1789 // based on compressed oops addressability. 1790 // Also, memory limits will be calculated based on 1791 // available os physical memory, not our MaxRAM limit, 1792 // unless MaxRAM is also specified. 1793 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1794 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1795 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1796 !FLAG_IS_DEFAULT(MinRAMFraction) || 1797 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1798 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1799 !FLAG_IS_DEFAULT(MaxRAM)); 1800 if (override_coop_limit) { 1801 if (FLAG_IS_DEFAULT(MaxRAM)) { 1802 phys_mem = os::physical_memory(); 1803 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1804 } else { 1805 phys_mem = (julong)MaxRAM; 1806 } 1807 } else { 1808 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1809 : (julong)MaxRAM; 1810 } 1811 1812 1813 // Convert deprecated flags 1814 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1815 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1816 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1817 1818 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1819 !FLAG_IS_DEFAULT(MinRAMFraction)) 1820 MinRAMPercentage = 100.0 / MinRAMFraction; 1821 1822 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1823 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1824 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1825 1826 // If the maximum heap size has not been set with -Xmx, 1827 // then set it as fraction of the size of physical memory, 1828 // respecting the maximum and minimum sizes of the heap. 1829 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1830 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1831 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1832 if (reasonable_min < MaxHeapSize) { 1833 // Small physical memory, so use a minimum fraction of it for the heap 1834 reasonable_max = reasonable_min; 1835 } else { 1836 // Not-small physical memory, so require a heap at least 1837 // as large as MaxHeapSize 1838 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1839 } 1840 1841 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1842 // Limit the heap size to ErgoHeapSizeLimit 1843 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1844 } 1845 1846 #ifdef _LP64 1847 if (UseCompressedOops || UseCompressedClassPointers) { 1848 // HeapBaseMinAddress can be greater than default but not less than. 1849 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1850 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1851 // matches compressed oops printing flags 1852 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1853 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1854 DefaultHeapBaseMinAddress, 1855 DefaultHeapBaseMinAddress/G, 1856 HeapBaseMinAddress); 1857 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1858 } 1859 } 1860 } 1861 if (UseCompressedOops) { 1862 // Limit the heap size to the maximum possible when using compressed oops 1863 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1864 1865 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1866 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1867 // but it should be not less than default MaxHeapSize. 1868 max_coop_heap -= HeapBaseMinAddress; 1869 } 1870 1871 // If user specified flags prioritizing os physical 1872 // memory limits, then disable compressed oops if 1873 // limits exceed max_coop_heap and UseCompressedOops 1874 // was not specified. 1875 if (reasonable_max > max_coop_heap) { 1876 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1877 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1878 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1879 "Please check the setting of MaxRAMPercentage %5.2f." 1880 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1881 FLAG_SET_ERGO(UseCompressedOops, false); 1882 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) { 1883 FLAG_SET_ERGO(UseCompressedClassPointers, false); 1884 } 1885 } else { 1886 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1887 } 1888 } 1889 } 1890 #endif // _LP64 1891 1892 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1893 1894 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1895 // An initial heap size was specified on the command line, 1896 // so be sure that the maximum size is consistent. Done 1897 // after call to limit_by_allocatable_memory because that 1898 // method might reduce the allocation size. 1899 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1900 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1901 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1902 } 1903 1904 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1905 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1906 } 1907 1908 // If the minimum or initial heap_size have not been set or requested to be set 1909 // ergonomically, set them accordingly. 1910 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1911 julong reasonable_minimum = (julong)(OldSize + NewSize); 1912 1913 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1914 1915 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1916 1917 if (InitialHeapSize == 0) { 1918 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1919 1920 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1921 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1922 1923 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1924 1925 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1926 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1927 } 1928 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1929 // synchronize with InitialHeapSize to avoid errors with the default value. 1930 if (MinHeapSize == 0) { 1931 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1932 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1933 } 1934 } 1935 } 1936 1937 // This option inspects the machine and attempts to set various 1938 // parameters to be optimal for long-running, memory allocation 1939 // intensive jobs. It is intended for machines with large 1940 // amounts of cpu and memory. 1941 jint Arguments::set_aggressive_heap_flags() { 1942 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1943 // VM, but we may not be able to represent the total physical memory 1944 // available (like having 8gb of memory on a box but using a 32bit VM). 1945 // Thus, we need to make sure we're using a julong for intermediate 1946 // calculations. 1947 julong initHeapSize; 1948 julong total_memory = os::physical_memory(); 1949 1950 if (total_memory < (julong) 256 * M) { 1951 jio_fprintf(defaultStream::error_stream(), 1952 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1953 vm_exit(1); 1954 } 1955 1956 // The heap size is half of available memory, or (at most) 1957 // all of possible memory less 160mb (leaving room for the OS 1958 // when using ISM). This is the maximum; because adaptive sizing 1959 // is turned on below, the actual space used may be smaller. 1960 1961 initHeapSize = MIN2(total_memory / (julong) 2, 1962 total_memory - (julong) 160 * M); 1963 1964 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1965 1966 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1967 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1968 return JNI_EINVAL; 1969 } 1970 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1971 return JNI_EINVAL; 1972 } 1973 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1974 return JNI_EINVAL; 1975 } 1976 } 1977 if (FLAG_IS_DEFAULT(NewSize)) { 1978 // Make the young generation 3/8ths of the total heap. 1979 if (FLAG_SET_CMDLINE(NewSize, 1980 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1981 return JNI_EINVAL; 1982 } 1983 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1984 return JNI_EINVAL; 1985 } 1986 } 1987 1988 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1989 FLAG_SET_DEFAULT(UseLargePages, true); 1990 #endif 1991 1992 // Increase some data structure sizes for efficiency 1993 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1994 return JNI_EINVAL; 1995 } 1996 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1997 return JNI_EINVAL; 1998 } 1999 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 2000 return JNI_EINVAL; 2001 } 2002 2003 // See the OldPLABSize comment below, but replace 'after promotion' 2004 // with 'after copying'. YoungPLABSize is the size of the survivor 2005 // space per-gc-thread buffers. The default is 4kw. 2006 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 2007 return JNI_EINVAL; 2008 } 2009 2010 // OldPLABSize is the size of the buffers in the old gen that 2011 // UseParallelGC uses to promote live data that doesn't fit in the 2012 // survivor spaces. At any given time, there's one for each gc thread. 2013 // The default size is 1kw. These buffers are rarely used, since the 2014 // survivor spaces are usually big enough. For specjbb, however, there 2015 // are occasions when there's lots of live data in the young gen 2016 // and we end up promoting some of it. We don't have a definite 2017 // explanation for why bumping OldPLABSize helps, but the theory 2018 // is that a bigger PLAB results in retaining something like the 2019 // original allocation order after promotion, which improves mutator 2020 // locality. A minor effect may be that larger PLABs reduce the 2021 // number of PLAB allocation events during gc. The value of 8kw 2022 // was arrived at by experimenting with specjbb. 2023 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 2024 return JNI_EINVAL; 2025 } 2026 2027 // Enable parallel GC and adaptive generation sizing 2028 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 2029 return JNI_EINVAL; 2030 } 2031 2032 // Encourage steady state memory management 2033 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 2034 return JNI_EINVAL; 2035 } 2036 2037 // This appears to improve mutator locality 2038 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2039 return JNI_EINVAL; 2040 } 2041 2042 return JNI_OK; 2043 } 2044 2045 // This must be called after ergonomics. 2046 void Arguments::set_bytecode_flags() { 2047 if (!RewriteBytecodes) { 2048 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2049 } 2050 } 2051 2052 // Aggressive optimization flags 2053 jint Arguments::set_aggressive_opts_flags() { 2054 #ifdef COMPILER2 2055 if (AggressiveUnboxing) { 2056 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2057 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2058 } else if (!EliminateAutoBox) { 2059 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2060 AggressiveUnboxing = false; 2061 } 2062 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2063 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2064 } else if (!DoEscapeAnalysis) { 2065 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2066 AggressiveUnboxing = false; 2067 } 2068 } 2069 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2070 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2071 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2072 } 2073 // Feed the cache size setting into the JDK 2074 char buffer[1024]; 2075 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2076 if (!add_property(buffer)) { 2077 return JNI_ENOMEM; 2078 } 2079 } 2080 #endif 2081 2082 return JNI_OK; 2083 } 2084 2085 //=========================================================================================================== 2086 // Parsing of java.compiler property 2087 2088 void Arguments::process_java_compiler_argument(const char* arg) { 2089 // For backwards compatibility, Djava.compiler=NONE or "" 2090 // causes us to switch to -Xint mode UNLESS -Xdebug 2091 // is also specified. 2092 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2093 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2094 } 2095 } 2096 2097 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2098 _sun_java_launcher = os::strdup_check_oom(launcher); 2099 } 2100 2101 bool Arguments::created_by_java_launcher() { 2102 assert(_sun_java_launcher != NULL, "property must have value"); 2103 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2104 } 2105 2106 bool Arguments::sun_java_launcher_is_altjvm() { 2107 return _sun_java_launcher_is_altjvm; 2108 } 2109 2110 //=========================================================================================================== 2111 // Parsing of main arguments 2112 2113 unsigned int addreads_count = 0; 2114 unsigned int addexports_count = 0; 2115 unsigned int addopens_count = 0; 2116 unsigned int addmods_count = 0; 2117 unsigned int patch_mod_count = 0; 2118 2119 // Check the consistency of vm_init_args 2120 bool Arguments::check_vm_args_consistency() { 2121 // Method for adding checks for flag consistency. 2122 // The intent is to warn the user of all possible conflicts, 2123 // before returning an error. 2124 // Note: Needs platform-dependent factoring. 2125 bool status = true; 2126 2127 if (TLABRefillWasteFraction == 0) { 2128 jio_fprintf(defaultStream::error_stream(), 2129 "TLABRefillWasteFraction should be a denominator, " 2130 "not " SIZE_FORMAT "\n", 2131 TLABRefillWasteFraction); 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 status = CompilerConfig::check_args_consistency(status); 2147 #if INCLUDE_JVMCI 2148 if (status && EnableJVMCI) { 2149 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2150 AddProperty, UnwriteableProperty, InternalProperty); 2151 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2152 return false; 2153 } 2154 } 2155 #endif 2156 2157 #ifndef SUPPORT_RESERVED_STACK_AREA 2158 if (StackReservedPages != 0) { 2159 FLAG_SET_CMDLINE(StackReservedPages, 0); 2160 warning("Reserved Stack Area not supported on this platform"); 2161 } 2162 #endif 2163 2164 status = status && GCArguments::check_args_consistency(); 2165 2166 return status; 2167 } 2168 2169 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2170 const char* option_type) { 2171 if (ignore) return false; 2172 2173 const char* spacer = " "; 2174 if (option_type == NULL) { 2175 option_type = ++spacer; // Set both to the empty string. 2176 } 2177 2178 jio_fprintf(defaultStream::error_stream(), 2179 "Unrecognized %s%soption: %s\n", option_type, spacer, 2180 option->optionString); 2181 return true; 2182 } 2183 2184 static const char* user_assertion_options[] = { 2185 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2186 }; 2187 2188 static const char* system_assertion_options[] = { 2189 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2190 }; 2191 2192 bool Arguments::parse_uintx(const char* value, 2193 uintx* uintx_arg, 2194 uintx min_size) { 2195 2196 // Check the sign first since atojulong() parses only unsigned values. 2197 bool value_is_positive = !(*value == '-'); 2198 2199 if (value_is_positive) { 2200 julong n; 2201 bool good_return = atojulong(value, &n); 2202 if (good_return) { 2203 bool above_minimum = n >= min_size; 2204 bool value_is_too_large = n > max_uintx; 2205 2206 if (above_minimum && !value_is_too_large) { 2207 *uintx_arg = n; 2208 return true; 2209 } 2210 } 2211 } 2212 return false; 2213 } 2214 2215 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2216 assert(is_internal_module_property(prop_name) || 2217 strcmp(prop_name, "jdk.module.illegalAccess") == 0, "unknown module property: '%s'", prop_name); 2218 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2219 char* property = AllocateHeap(prop_len, mtArguments); 2220 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2221 if (ret < 0 || ret >= (int)prop_len) { 2222 FreeHeap(property); 2223 return false; 2224 } 2225 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 2226 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 2227 // that multiple occurrences of the associated flag just causes the existing property value to be 2228 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 2229 // to a property after we have finished flag processing. 2230 bool added = add_property(property, WriteableProperty, internal); 2231 FreeHeap(property); 2232 return added; 2233 } 2234 2235 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2236 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 2237 const unsigned int props_count_limit = 1000; 2238 const int max_digits = 3; 2239 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2240 2241 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2242 if (count < props_count_limit) { 2243 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2244 char* property = AllocateHeap(prop_len, mtArguments); 2245 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2246 if (ret < 0 || ret >= (int)prop_len) { 2247 FreeHeap(property); 2248 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2249 return false; 2250 } 2251 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2252 FreeHeap(property); 2253 return added; 2254 } 2255 2256 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2257 return false; 2258 } 2259 2260 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2261 julong* long_arg, 2262 julong min_size, 2263 julong max_size) { 2264 if (!atojulong(s, long_arg)) return arg_unreadable; 2265 return check_memory_size(*long_arg, min_size, max_size); 2266 } 2267 2268 // Parse JavaVMInitArgs structure 2269 2270 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 2271 const JavaVMInitArgs *java_tool_options_args, 2272 const JavaVMInitArgs *java_options_args, 2273 const JavaVMInitArgs *cmd_line_args) { 2274 bool patch_mod_javabase = false; 2275 2276 // Save default settings for some mode flags 2277 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2278 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2279 Arguments::_ClipInlining = ClipInlining; 2280 Arguments::_BackgroundCompilation = BackgroundCompilation; 2281 if (TieredCompilation) { 2282 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2283 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2284 } 2285 2286 // Remember the default value of SharedBaseAddress. 2287 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 2288 2289 // Setup flags for mixed which is the default 2290 set_mode_flags(_mixed); 2291 2292 // Parse args structure generated from java.base vm options resource 2293 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE); 2294 if (result != JNI_OK) { 2295 return result; 2296 } 2297 2298 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2299 // variable (if present). 2300 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2301 if (result != JNI_OK) { 2302 return result; 2303 } 2304 2305 // Parse args structure generated from the command line flags. 2306 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE); 2307 if (result != JNI_OK) { 2308 return result; 2309 } 2310 2311 // Parse args structure generated from the _JAVA_OPTIONS environment 2312 // variable (if present) (mimics classic VM) 2313 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2314 if (result != JNI_OK) { 2315 return result; 2316 } 2317 2318 // We need to ensure processor and memory resources have been properly 2319 // configured - which may rely on arguments we just processed - before 2320 // doing the final argument processing. Any argument processing that 2321 // needs to know about processor and memory resources must occur after 2322 // this point. 2323 2324 os::init_container_support(); 2325 2326 // Do final processing now that all arguments have been parsed 2327 result = finalize_vm_init_args(patch_mod_javabase); 2328 if (result != JNI_OK) { 2329 return result; 2330 } 2331 2332 return JNI_OK; 2333 } 2334 2335 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2336 // represents a valid JDWP agent. is_path==true denotes that we 2337 // are dealing with -agentpath (case where name is a path), otherwise with 2338 // -agentlib 2339 bool valid_jdwp_agent(char *name, bool is_path) { 2340 char *_name; 2341 const char *_jdwp = "jdwp"; 2342 size_t _len_jdwp, _len_prefix; 2343 2344 if (is_path) { 2345 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2346 return false; 2347 } 2348 2349 _name++; // skip past last path separator 2350 _len_prefix = strlen(JNI_LIB_PREFIX); 2351 2352 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2353 return false; 2354 } 2355 2356 _name += _len_prefix; 2357 _len_jdwp = strlen(_jdwp); 2358 2359 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2360 _name += _len_jdwp; 2361 } 2362 else { 2363 return false; 2364 } 2365 2366 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2367 return false; 2368 } 2369 2370 return true; 2371 } 2372 2373 if (strcmp(name, _jdwp) == 0) { 2374 return true; 2375 } 2376 2377 return false; 2378 } 2379 2380 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2381 // --patch-module=<module>=<file>(<pathsep><file>)* 2382 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2383 // Find the equal sign between the module name and the path specification 2384 const char* module_equal = strchr(patch_mod_tail, '='); 2385 if (module_equal == NULL) { 2386 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2387 return JNI_ERR; 2388 } else { 2389 // Pick out the module name 2390 size_t module_len = module_equal - patch_mod_tail; 2391 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2392 if (module_name != NULL) { 2393 memcpy(module_name, patch_mod_tail, module_len); 2394 *(module_name + module_len) = '\0'; 2395 // The path piece begins one past the module_equal sign 2396 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2397 FREE_C_HEAP_ARRAY(char, module_name); 2398 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2399 return JNI_ENOMEM; 2400 } 2401 } else { 2402 return JNI_ENOMEM; 2403 } 2404 } 2405 return JNI_OK; 2406 } 2407 2408 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2409 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2410 // The min and max sizes match the values in globals.hpp, but scaled 2411 // with K. The values have been chosen so that alignment with page 2412 // size doesn't change the max value, which makes the conversions 2413 // back and forth between Xss value and ThreadStackSize value easier. 2414 // The values have also been chosen to fit inside a 32-bit signed type. 2415 const julong min_ThreadStackSize = 0; 2416 const julong max_ThreadStackSize = 1 * M; 2417 2418 const julong min_size = min_ThreadStackSize * K; 2419 const julong max_size = max_ThreadStackSize * K; 2420 2421 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2422 2423 julong size = 0; 2424 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2425 if (errcode != arg_in_range) { 2426 bool silent = (option == NULL); // Allow testing to silence error messages 2427 if (!silent) { 2428 jio_fprintf(defaultStream::error_stream(), 2429 "Invalid thread stack size: %s\n", option->optionString); 2430 describe_range_error(errcode); 2431 } 2432 return JNI_EINVAL; 2433 } 2434 2435 // Internally track ThreadStackSize in units of 1024 bytes. 2436 const julong size_aligned = align_up(size, K); 2437 assert(size <= size_aligned, 2438 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2439 size, size_aligned); 2440 2441 const julong size_in_K = size_aligned / K; 2442 assert(size_in_K < (julong)max_intx, 2443 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2444 size_in_K); 2445 2446 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2447 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2448 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2449 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2450 max_expanded, size_in_K); 2451 2452 *out_ThreadStackSize = (intx)size_in_K; 2453 2454 return JNI_OK; 2455 } 2456 2457 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) { 2458 // For match_option to return remaining or value part of option string 2459 const char* tail; 2460 2461 // iterate over arguments 2462 for (int index = 0; index < args->nOptions; index++) { 2463 bool is_absolute_path = false; // for -agentpath vs -agentlib 2464 2465 const JavaVMOption* option = args->options + index; 2466 2467 if (!match_option(option, "-Djava.class.path", &tail) && 2468 !match_option(option, "-Dsun.java.command", &tail) && 2469 !match_option(option, "-Dsun.java.launcher", &tail)) { 2470 2471 // add all jvm options to the jvm_args string. This string 2472 // is used later to set the java.vm.args PerfData string constant. 2473 // the -Djava.class.path and the -Dsun.java.command options are 2474 // omitted from jvm_args string as each have their own PerfData 2475 // string constant object. 2476 build_jvm_args(option->optionString); 2477 } 2478 2479 // -verbose:[class/module/gc/jni] 2480 if (match_option(option, "-verbose", &tail)) { 2481 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2482 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2483 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2484 } else if (!strcmp(tail, ":module")) { 2485 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2486 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2487 } else if (!strcmp(tail, ":gc")) { 2488 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2489 } else if (!strcmp(tail, ":jni")) { 2490 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2491 } 2492 // -da / -ea / -disableassertions / -enableassertions 2493 // These accept an optional class/package name separated by a colon, e.g., 2494 // -da:java.lang.Thread. 2495 } else if (match_option(option, user_assertion_options, &tail, true)) { 2496 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2497 if (*tail == '\0') { 2498 JavaAssertions::setUserClassDefault(enable); 2499 } else { 2500 assert(*tail == ':', "bogus match by match_option()"); 2501 JavaAssertions::addOption(tail + 1, enable); 2502 } 2503 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2504 } else if (match_option(option, system_assertion_options, &tail, false)) { 2505 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2506 JavaAssertions::setSystemClassDefault(enable); 2507 // -bootclasspath: 2508 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2509 jio_fprintf(defaultStream::output_stream(), 2510 "-Xbootclasspath is no longer a supported option.\n"); 2511 return JNI_EINVAL; 2512 // -bootclasspath/a: 2513 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2514 Arguments::append_sysclasspath(tail); 2515 #if INCLUDE_CDS 2516 MetaspaceShared::disable_optimized_module_handling(); 2517 log_info(cds)("optimized module handling: disabled due to bootclasspath was appended"); 2518 #endif 2519 // -bootclasspath/p: 2520 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2521 jio_fprintf(defaultStream::output_stream(), 2522 "-Xbootclasspath/p is no longer a supported option.\n"); 2523 return JNI_EINVAL; 2524 // -Xrun 2525 } else if (match_option(option, "-Xrun", &tail)) { 2526 if (tail != NULL) { 2527 const char* pos = strchr(tail, ':'); 2528 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2529 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2530 jio_snprintf(name, len + 1, "%s", tail); 2531 2532 char *options = NULL; 2533 if(pos != NULL) { 2534 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2535 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2536 } 2537 #if !INCLUDE_JVMTI 2538 if (strcmp(name, "jdwp") == 0) { 2539 jio_fprintf(defaultStream::error_stream(), 2540 "Debugging agents are not supported in this VM\n"); 2541 return JNI_ERR; 2542 } 2543 #endif // !INCLUDE_JVMTI 2544 add_init_library(name, options); 2545 } 2546 } else if (match_option(option, "--add-reads=", &tail)) { 2547 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2548 return JNI_ENOMEM; 2549 } 2550 } else if (match_option(option, "--add-exports=", &tail)) { 2551 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2552 return JNI_ENOMEM; 2553 } 2554 } else if (match_option(option, "--add-opens=", &tail)) { 2555 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2556 return JNI_ENOMEM; 2557 } 2558 } else if (match_option(option, "--add-modules=", &tail)) { 2559 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2560 return JNI_ENOMEM; 2561 } 2562 } else if (match_option(option, "--limit-modules=", &tail)) { 2563 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2564 return JNI_ENOMEM; 2565 } 2566 } else if (match_option(option, "--module-path=", &tail)) { 2567 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2568 return JNI_ENOMEM; 2569 } 2570 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2571 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2572 return JNI_ENOMEM; 2573 } 2574 } else if (match_option(option, "--patch-module=", &tail)) { 2575 // --patch-module=<module>=<file>(<pathsep><file>)* 2576 int res = process_patch_mod_option(tail, patch_mod_javabase); 2577 if (res != JNI_OK) { 2578 return res; 2579 } 2580 } else if (match_option(option, "--illegal-access=", &tail)) { 2581 if (!create_module_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2582 return JNI_ENOMEM; 2583 } 2584 // -agentlib and -agentpath 2585 } else if (match_option(option, "-agentlib:", &tail) || 2586 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2587 if(tail != NULL) { 2588 const char* pos = strchr(tail, '='); 2589 char* name; 2590 if (pos == NULL) { 2591 name = os::strdup_check_oom(tail, mtArguments); 2592 } else { 2593 size_t len = pos - tail; 2594 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2595 memcpy(name, tail, len); 2596 name[len] = '\0'; 2597 } 2598 2599 char *options = NULL; 2600 if(pos != NULL) { 2601 options = os::strdup_check_oom(pos + 1, mtArguments); 2602 } 2603 #if !INCLUDE_JVMTI 2604 if (valid_jdwp_agent(name, is_absolute_path)) { 2605 jio_fprintf(defaultStream::error_stream(), 2606 "Debugging agents are not supported in this VM\n"); 2607 return JNI_ERR; 2608 } 2609 #endif // !INCLUDE_JVMTI 2610 add_init_agent(name, options, is_absolute_path); 2611 } 2612 // -javaagent 2613 } else if (match_option(option, "-javaagent:", &tail)) { 2614 #if !INCLUDE_JVMTI 2615 jio_fprintf(defaultStream::error_stream(), 2616 "Instrumentation agents are not supported in this VM\n"); 2617 return JNI_ERR; 2618 #else 2619 if (tail != NULL) { 2620 size_t length = strlen(tail) + 1; 2621 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2622 jio_snprintf(options, length, "%s", tail); 2623 add_instrument_agent("instrument", options, false); 2624 // java agents need module java.instrument 2625 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2626 return JNI_ENOMEM; 2627 } 2628 } 2629 #endif // !INCLUDE_JVMTI 2630 // --enable_preview 2631 } else if (match_option(option, "--enable-preview")) { 2632 set_enable_preview(); 2633 // -Xnoclassgc 2634 } else if (match_option(option, "-Xnoclassgc")) { 2635 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2636 return JNI_EINVAL; 2637 } 2638 // -Xbatch 2639 } else if (match_option(option, "-Xbatch")) { 2640 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2641 return JNI_EINVAL; 2642 } 2643 // -Xmn for compatibility with other JVM vendors 2644 } else if (match_option(option, "-Xmn", &tail)) { 2645 julong long_initial_young_size = 0; 2646 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2647 if (errcode != arg_in_range) { 2648 jio_fprintf(defaultStream::error_stream(), 2649 "Invalid initial young generation size: %s\n", option->optionString); 2650 describe_range_error(errcode); 2651 return JNI_EINVAL; 2652 } 2653 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2654 return JNI_EINVAL; 2655 } 2656 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2657 return JNI_EINVAL; 2658 } 2659 // -Xms 2660 } else if (match_option(option, "-Xms", &tail)) { 2661 julong size = 0; 2662 // an initial heap size of 0 means automatically determine 2663 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2664 if (errcode != arg_in_range) { 2665 jio_fprintf(defaultStream::error_stream(), 2666 "Invalid initial heap size: %s\n", option->optionString); 2667 describe_range_error(errcode); 2668 return JNI_EINVAL; 2669 } 2670 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2671 return JNI_EINVAL; 2672 } 2673 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2674 return JNI_EINVAL; 2675 } 2676 // -Xmx 2677 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2678 julong long_max_heap_size = 0; 2679 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2680 if (errcode != arg_in_range) { 2681 jio_fprintf(defaultStream::error_stream(), 2682 "Invalid maximum heap size: %s\n", option->optionString); 2683 describe_range_error(errcode); 2684 return JNI_EINVAL; 2685 } 2686 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2687 return JNI_EINVAL; 2688 } 2689 // Xmaxf 2690 } else if (match_option(option, "-Xmaxf", &tail)) { 2691 char* err; 2692 int maxf = (int)(strtod(tail, &err) * 100); 2693 if (*err != '\0' || *tail == '\0') { 2694 jio_fprintf(defaultStream::error_stream(), 2695 "Bad max heap free percentage size: %s\n", 2696 option->optionString); 2697 return JNI_EINVAL; 2698 } else { 2699 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2700 return JNI_EINVAL; 2701 } 2702 } 2703 // Xminf 2704 } else if (match_option(option, "-Xminf", &tail)) { 2705 char* err; 2706 int minf = (int)(strtod(tail, &err) * 100); 2707 if (*err != '\0' || *tail == '\0') { 2708 jio_fprintf(defaultStream::error_stream(), 2709 "Bad min heap free percentage size: %s\n", 2710 option->optionString); 2711 return JNI_EINVAL; 2712 } else { 2713 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2714 return JNI_EINVAL; 2715 } 2716 } 2717 // -Xss 2718 } else if (match_option(option, "-Xss", &tail)) { 2719 intx value = 0; 2720 jint err = parse_xss(option, tail, &value); 2721 if (err != JNI_OK) { 2722 return err; 2723 } 2724 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2725 return JNI_EINVAL; 2726 } 2727 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2728 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2729 julong long_ReservedCodeCacheSize = 0; 2730 2731 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2732 if (errcode != arg_in_range) { 2733 jio_fprintf(defaultStream::error_stream(), 2734 "Invalid maximum code cache size: %s.\n", option->optionString); 2735 return JNI_EINVAL; 2736 } 2737 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2738 return JNI_EINVAL; 2739 } 2740 // -green 2741 } else if (match_option(option, "-green")) { 2742 jio_fprintf(defaultStream::error_stream(), 2743 "Green threads support not available\n"); 2744 return JNI_EINVAL; 2745 // -native 2746 } else if (match_option(option, "-native")) { 2747 // HotSpot always uses native threads, ignore silently for compatibility 2748 // -Xrs 2749 } else if (match_option(option, "-Xrs")) { 2750 // Classic/EVM option, new functionality 2751 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2752 return JNI_EINVAL; 2753 } 2754 // -Xprof 2755 } else if (match_option(option, "-Xprof")) { 2756 char version[256]; 2757 // Obsolete in JDK 10 2758 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2759 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2760 // -Xinternalversion 2761 } else if (match_option(option, "-Xinternalversion")) { 2762 jio_fprintf(defaultStream::output_stream(), "%s\n", 2763 VM_Version::internal_vm_info_string()); 2764 vm_exit(0); 2765 #ifndef PRODUCT 2766 // -Xprintflags 2767 } else if (match_option(option, "-Xprintflags")) { 2768 JVMFlag::printFlags(tty, false); 2769 vm_exit(0); 2770 #endif 2771 // -D 2772 } else if (match_option(option, "-D", &tail)) { 2773 const char* value; 2774 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2775 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2776 // abort if -Djava.endorsed.dirs is set 2777 jio_fprintf(defaultStream::output_stream(), 2778 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2779 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2780 return JNI_EINVAL; 2781 } 2782 if (match_option(option, "-Djava.ext.dirs=", &value) && 2783 *value != '\0' && strcmp(value, "\"\"") != 0) { 2784 // abort if -Djava.ext.dirs is set 2785 jio_fprintf(defaultStream::output_stream(), 2786 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2787 return JNI_EINVAL; 2788 } 2789 // Check for module related properties. They must be set using the modules 2790 // options. For example: use "--add-modules=java.sql", not 2791 // "-Djdk.module.addmods=java.sql" 2792 if (is_internal_module_property(option->optionString + 2)) { 2793 needs_module_property_warning = true; 2794 continue; 2795 } 2796 if (!add_property(tail)) { 2797 return JNI_ENOMEM; 2798 } 2799 // Out of the box management support 2800 if (match_option(option, "-Dcom.sun.management", &tail)) { 2801 #if INCLUDE_MANAGEMENT 2802 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2803 return JNI_EINVAL; 2804 } 2805 // management agent in module jdk.management.agent 2806 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2807 return JNI_ENOMEM; 2808 } 2809 #else 2810 jio_fprintf(defaultStream::output_stream(), 2811 "-Dcom.sun.management is not supported in this VM.\n"); 2812 return JNI_ERR; 2813 #endif 2814 } 2815 // -Xint 2816 } else if (match_option(option, "-Xint")) { 2817 set_mode_flags(_int); 2818 // -Xmixed 2819 } else if (match_option(option, "-Xmixed")) { 2820 set_mode_flags(_mixed); 2821 // -Xcomp 2822 } else if (match_option(option, "-Xcomp")) { 2823 // for testing the compiler; turn off all flags that inhibit compilation 2824 set_mode_flags(_comp); 2825 // -Xshare:dump 2826 } else if (match_option(option, "-Xshare:dump")) { 2827 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) { 2828 return JNI_EINVAL; 2829 } 2830 // -Xshare:on 2831 } else if (match_option(option, "-Xshare:on")) { 2832 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2833 return JNI_EINVAL; 2834 } 2835 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2836 return JNI_EINVAL; 2837 } 2838 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2839 } else if (match_option(option, "-Xshare:auto")) { 2840 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2841 return JNI_EINVAL; 2842 } 2843 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2844 return JNI_EINVAL; 2845 } 2846 // -Xshare:off 2847 } else if (match_option(option, "-Xshare:off")) { 2848 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) { 2849 return JNI_EINVAL; 2850 } 2851 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2852 return JNI_EINVAL; 2853 } 2854 // -Xverify 2855 } else if (match_option(option, "-Xverify", &tail)) { 2856 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2857 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2858 return JNI_EINVAL; 2859 } 2860 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2861 return JNI_EINVAL; 2862 } 2863 } else if (strcmp(tail, ":remote") == 0) { 2864 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2865 return JNI_EINVAL; 2866 } 2867 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2868 return JNI_EINVAL; 2869 } 2870 } else if (strcmp(tail, ":none") == 0) { 2871 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2872 return JNI_EINVAL; 2873 } 2874 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2875 return JNI_EINVAL; 2876 } 2877 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2878 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2879 return JNI_EINVAL; 2880 } 2881 // -Xdebug 2882 } else if (match_option(option, "-Xdebug")) { 2883 // note this flag has been used, then ignore 2884 set_xdebug_mode(true); 2885 // -Xnoagent 2886 } else if (match_option(option, "-Xnoagent")) { 2887 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2888 } else if (match_option(option, "-Xloggc:", &tail)) { 2889 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2890 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2891 _gc_log_filename = os::strdup_check_oom(tail); 2892 } else if (match_option(option, "-Xlog", &tail)) { 2893 bool ret = false; 2894 if (strcmp(tail, ":help") == 0) { 2895 fileStream stream(defaultStream::output_stream()); 2896 LogConfiguration::print_command_line_help(&stream); 2897 vm_exit(0); 2898 } else if (strcmp(tail, ":disable") == 0) { 2899 LogConfiguration::disable_logging(); 2900 ret = true; 2901 } else if (*tail == '\0') { 2902 ret = LogConfiguration::parse_command_line_arguments(); 2903 assert(ret, "-Xlog without arguments should never fail to parse"); 2904 } else if (*tail == ':') { 2905 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2906 } 2907 if (ret == false) { 2908 jio_fprintf(defaultStream::error_stream(), 2909 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2910 tail); 2911 return JNI_EINVAL; 2912 } 2913 // JNI hooks 2914 } else if (match_option(option, "-Xcheck", &tail)) { 2915 if (!strcmp(tail, ":jni")) { 2916 #if !INCLUDE_JNI_CHECK 2917 warning("JNI CHECKING is not supported in this VM"); 2918 #else 2919 CheckJNICalls = true; 2920 #endif // INCLUDE_JNI_CHECK 2921 } else if (is_bad_option(option, args->ignoreUnrecognized, 2922 "check")) { 2923 return JNI_EINVAL; 2924 } 2925 } else if (match_option(option, "vfprintf")) { 2926 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2927 } else if (match_option(option, "exit")) { 2928 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2929 } else if (match_option(option, "abort")) { 2930 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2931 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2932 // and the last option wins. 2933 } else if (match_option(option, "-XX:+NeverTenure")) { 2934 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2935 return JNI_EINVAL; 2936 } 2937 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2938 return JNI_EINVAL; 2939 } 2940 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2941 return JNI_EINVAL; 2942 } 2943 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2944 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2945 return JNI_EINVAL; 2946 } 2947 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2948 return JNI_EINVAL; 2949 } 2950 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2951 return JNI_EINVAL; 2952 } 2953 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2954 uintx max_tenuring_thresh = 0; 2955 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2956 jio_fprintf(defaultStream::error_stream(), 2957 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2958 return JNI_EINVAL; 2959 } 2960 2961 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2962 return JNI_EINVAL; 2963 } 2964 2965 if (MaxTenuringThreshold == 0) { 2966 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2967 return JNI_EINVAL; 2968 } 2969 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2970 return JNI_EINVAL; 2971 } 2972 } else { 2973 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2974 return JNI_EINVAL; 2975 } 2976 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2977 return JNI_EINVAL; 2978 } 2979 } 2980 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2981 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2982 return JNI_EINVAL; 2983 } 2984 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2985 return JNI_EINVAL; 2986 } 2987 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2988 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2989 return JNI_EINVAL; 2990 } 2991 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2995 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2996 return JNI_EINVAL; 2997 } 2998 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2999 return JNI_EINVAL; 3000 } 3001 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 3002 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 3003 return JNI_EINVAL; 3004 } 3005 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 3006 return JNI_EINVAL; 3007 } 3008 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3009 #if defined(DTRACE_ENABLED) 3010 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 3011 return JNI_EINVAL; 3012 } 3013 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 3014 return JNI_EINVAL; 3015 } 3016 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 3017 return JNI_EINVAL; 3018 } 3019 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 3020 return JNI_EINVAL; 3021 } 3022 #else // defined(DTRACE_ENABLED) 3023 jio_fprintf(defaultStream::error_stream(), 3024 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3025 return JNI_EINVAL; 3026 #endif // defined(DTRACE_ENABLED) 3027 #ifdef ASSERT 3028 } else if (match_option(option, "-XX:+FullGCALot")) { 3029 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 3030 return JNI_EINVAL; 3031 } 3032 // disable scavenge before parallel mark-compact 3033 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 3034 return JNI_EINVAL; 3035 } 3036 #endif 3037 #if !INCLUDE_MANAGEMENT 3038 } else if (match_option(option, "-XX:+ManagementServer")) { 3039 jio_fprintf(defaultStream::error_stream(), 3040 "ManagementServer is not supported in this VM.\n"); 3041 return JNI_ERR; 3042 #endif // INCLUDE_MANAGEMENT 3043 #if INCLUDE_JVMCI 3044 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) { 3045 if (EnableJVMCIProduct) { 3046 jio_fprintf(defaultStream::error_stream(), 3047 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n"); 3048 return JNI_EINVAL; 3049 } 3050 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) { 3051 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before 3052 if (EnableJVMCIProduct) { 3053 continue; 3054 } 3055 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 3056 // Allow this flag if it has been unlocked. 3057 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) { 3058 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) { 3059 jio_fprintf(defaultStream::error_stream(), 3060 "Unable to enable JVMCI in product mode"); 3061 return JNI_ERR; 3062 } 3063 } 3064 // The flag was locked so process normally to report that error 3065 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 3066 return JNI_EINVAL; 3067 } 3068 #endif // INCLUDE_JVMCI 3069 #if INCLUDE_JFR 3070 } else if (match_jfr_option(&option)) { 3071 return JNI_EINVAL; 3072 #endif 3073 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3074 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3075 // already been handled 3076 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3077 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3078 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3079 return JNI_EINVAL; 3080 } 3081 } 3082 // Unknown option 3083 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3084 return JNI_ERR; 3085 } 3086 } 3087 3088 // PrintSharedArchiveAndExit will turn on 3089 // -Xshare:on 3090 // -Xlog:class+path=info 3091 if (PrintSharedArchiveAndExit) { 3092 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 3093 return JNI_EINVAL; 3094 } 3095 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 3096 return JNI_EINVAL; 3097 } 3098 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3099 } 3100 3101 fix_appclasspath(); 3102 3103 return JNI_OK; 3104 } 3105 3106 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3107 // For java.base check for duplicate --patch-module options being specified on the command line. 3108 // This check is only required for java.base, all other duplicate module specifications 3109 // will be checked during module system initialization. The module system initialization 3110 // will throw an ExceptionInInitializerError if this situation occurs. 3111 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3112 if (*patch_mod_javabase) { 3113 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3114 } else { 3115 *patch_mod_javabase = true; 3116 } 3117 } 3118 3119 // Create GrowableArray lazily, only if --patch-module has been specified 3120 if (_patch_mod_prefix == NULL) { 3121 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 3122 } 3123 3124 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3125 } 3126 3127 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3128 // 3129 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3130 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3131 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3132 // path is treated as the current directory. 3133 // 3134 // This causes problems with CDS, which requires that all directories specified in the classpath 3135 // must be empty. In most cases, applications do NOT want to load classes from the current 3136 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3137 // scripts compatible with CDS. 3138 void Arguments::fix_appclasspath() { 3139 if (IgnoreEmptyClassPaths) { 3140 const char separator = *os::path_separator(); 3141 const char* src = _java_class_path->value(); 3142 3143 // skip over all the leading empty paths 3144 while (*src == separator) { 3145 src ++; 3146 } 3147 3148 char* copy = os::strdup_check_oom(src, mtArguments); 3149 3150 // trim all trailing empty paths 3151 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3152 *tail = '\0'; 3153 } 3154 3155 char from[3] = {separator, separator, '\0'}; 3156 char to [2] = {separator, '\0'}; 3157 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3158 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3159 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3160 } 3161 3162 _java_class_path->set_writeable_value(copy); 3163 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3164 } 3165 } 3166 3167 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3168 // check if the default lib/endorsed directory exists; if so, error 3169 char path[JVM_MAXPATHLEN]; 3170 const char* fileSep = os::file_separator(); 3171 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3172 3173 DIR* dir = os::opendir(path); 3174 if (dir != NULL) { 3175 jio_fprintf(defaultStream::output_stream(), 3176 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3177 "in modular form will be supported via the concept of upgradeable modules.\n"); 3178 os::closedir(dir); 3179 return JNI_ERR; 3180 } 3181 3182 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3183 dir = os::opendir(path); 3184 if (dir != NULL) { 3185 jio_fprintf(defaultStream::output_stream(), 3186 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3187 "Use -classpath instead.\n."); 3188 os::closedir(dir); 3189 return JNI_ERR; 3190 } 3191 3192 // This must be done after all arguments have been processed 3193 // and the container support has been initialized since AggressiveHeap 3194 // relies on the amount of total memory available. 3195 if (AggressiveHeap) { 3196 jint result = set_aggressive_heap_flags(); 3197 if (result != JNI_OK) { 3198 return result; 3199 } 3200 } 3201 3202 // This must be done after all arguments have been processed. 3203 // java_compiler() true means set to "NONE" or empty. 3204 if (java_compiler() && !xdebug_mode()) { 3205 // For backwards compatibility, we switch to interpreted mode if 3206 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3207 // not specified. 3208 set_mode_flags(_int); 3209 } 3210 3211 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3212 // but like -Xint, leave compilation thresholds unaffected. 3213 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3214 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3215 set_mode_flags(_int); 3216 } 3217 3218 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3219 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3220 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3221 } 3222 3223 #if !COMPILER2_OR_JVMCI 3224 // Don't degrade server performance for footprint 3225 if (FLAG_IS_DEFAULT(UseLargePages) && 3226 MaxHeapSize < LargePageHeapSizeThreshold) { 3227 // No need for large granularity pages w/small heaps. 3228 // Note that large pages are enabled/disabled for both the 3229 // Java heap and the code cache. 3230 FLAG_SET_DEFAULT(UseLargePages, false); 3231 } 3232 3233 UNSUPPORTED_OPTION(ProfileInterpreter); 3234 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3235 #endif 3236 3237 3238 #ifdef TIERED 3239 // Parse the CompilationMode flag 3240 if (!CompilationModeFlag::initialize()) { 3241 return JNI_ERR; 3242 } 3243 #else 3244 // Tiered compilation is undefined. 3245 UNSUPPORTED_OPTION(TieredCompilation); 3246 #endif 3247 3248 if (!check_vm_args_consistency()) { 3249 return JNI_ERR; 3250 } 3251 3252 #if INCLUDE_CDS 3253 if (DumpSharedSpaces) { 3254 // Disable biased locking now as it interferes with the clean up of 3255 // the archived Klasses and Java string objects (at dump time only). 3256 UseBiasedLocking = false; 3257 3258 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3259 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable 3260 // compiler just to be safe. 3261 // 3262 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata 3263 // instead of modifying them in place. The copy is inaccessible to the compiler. 3264 // TODO: revisit the following for the static archive case. 3265 set_mode_flags(_int); 3266 } 3267 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) { 3268 // Always verify non-system classes during CDS dump 3269 if (!BytecodeVerificationRemote) { 3270 BytecodeVerificationRemote = true; 3271 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3272 } 3273 } 3274 if (ArchiveClassesAtExit == NULL) { 3275 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false); 3276 } 3277 if (UseSharedSpaces && patch_mod_javabase) { 3278 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3279 } 3280 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3281 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3282 } 3283 #endif 3284 3285 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3286 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3287 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3288 3289 return JNI_OK; 3290 } 3291 3292 // Helper class for controlling the lifetime of JavaVMInitArgs 3293 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3294 // deleted on the destruction of the ScopedVMInitArgs object. 3295 class ScopedVMInitArgs : public StackObj { 3296 private: 3297 JavaVMInitArgs _args; 3298 char* _container_name; 3299 bool _is_set; 3300 char* _vm_options_file_arg; 3301 3302 public: 3303 ScopedVMInitArgs(const char *container_name) { 3304 _args.version = JNI_VERSION_1_2; 3305 _args.nOptions = 0; 3306 _args.options = NULL; 3307 _args.ignoreUnrecognized = false; 3308 _container_name = (char *)container_name; 3309 _is_set = false; 3310 _vm_options_file_arg = NULL; 3311 } 3312 3313 // Populates the JavaVMInitArgs object represented by this 3314 // ScopedVMInitArgs object with the arguments in options. The 3315 // allocated memory is deleted by the destructor. If this method 3316 // returns anything other than JNI_OK, then this object is in a 3317 // partially constructed state, and should be abandoned. 3318 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3319 _is_set = true; 3320 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3321 JavaVMOption, options->length(), mtArguments); 3322 if (options_arr == NULL) { 3323 return JNI_ENOMEM; 3324 } 3325 _args.options = options_arr; 3326 3327 for (int i = 0; i < options->length(); i++) { 3328 options_arr[i] = options->at(i); 3329 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3330 if (options_arr[i].optionString == NULL) { 3331 // Rely on the destructor to do cleanup. 3332 _args.nOptions = i; 3333 return JNI_ENOMEM; 3334 } 3335 } 3336 3337 _args.nOptions = options->length(); 3338 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3339 return JNI_OK; 3340 } 3341 3342 JavaVMInitArgs* get() { return &_args; } 3343 char* container_name() { return _container_name; } 3344 bool is_set() { return _is_set; } 3345 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3346 char* vm_options_file_arg() { return _vm_options_file_arg; } 3347 3348 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3349 if (_vm_options_file_arg != NULL) { 3350 os::free(_vm_options_file_arg); 3351 } 3352 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3353 } 3354 3355 ~ScopedVMInitArgs() { 3356 if (_vm_options_file_arg != NULL) { 3357 os::free(_vm_options_file_arg); 3358 } 3359 if (_args.options == NULL) return; 3360 for (int i = 0; i < _args.nOptions; i++) { 3361 os::free(_args.options[i].optionString); 3362 } 3363 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3364 } 3365 3366 // Insert options into this option list, to replace option at 3367 // vm_options_file_pos (-XX:VMOptionsFile) 3368 jint insert(const JavaVMInitArgs* args, 3369 const JavaVMInitArgs* args_to_insert, 3370 const int vm_options_file_pos) { 3371 assert(_args.options == NULL, "shouldn't be set yet"); 3372 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3373 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3374 3375 int length = args->nOptions + args_to_insert->nOptions - 1; 3376 // Construct new option array 3377 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3378 for (int i = 0; i < args->nOptions; i++) { 3379 if (i == vm_options_file_pos) { 3380 // insert the new options starting at the same place as the 3381 // -XX:VMOptionsFile option 3382 for (int j = 0; j < args_to_insert->nOptions; j++) { 3383 options.push(args_to_insert->options[j]); 3384 } 3385 } else { 3386 options.push(args->options[i]); 3387 } 3388 } 3389 // make into options array 3390 return set_args(&options); 3391 } 3392 }; 3393 3394 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3395 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3396 } 3397 3398 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3399 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3400 } 3401 3402 jint Arguments::parse_options_environment_variable(const char* name, 3403 ScopedVMInitArgs* vm_args) { 3404 char *buffer = ::getenv(name); 3405 3406 // Don't check this environment variable if user has special privileges 3407 // (e.g. unix su command). 3408 if (buffer == NULL || os::have_special_privileges()) { 3409 return JNI_OK; 3410 } 3411 3412 if ((buffer = os::strdup(buffer)) == NULL) { 3413 return JNI_ENOMEM; 3414 } 3415 3416 jio_fprintf(defaultStream::error_stream(), 3417 "Picked up %s: %s\n", name, buffer); 3418 3419 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3420 3421 os::free(buffer); 3422 return retcode; 3423 } 3424 3425 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3426 // read file into buffer 3427 int fd = ::open(file_name, O_RDONLY); 3428 if (fd < 0) { 3429 jio_fprintf(defaultStream::error_stream(), 3430 "Could not open options file '%s'\n", 3431 file_name); 3432 return JNI_ERR; 3433 } 3434 3435 struct stat stbuf; 3436 int retcode = os::stat(file_name, &stbuf); 3437 if (retcode != 0) { 3438 jio_fprintf(defaultStream::error_stream(), 3439 "Could not stat options file '%s'\n", 3440 file_name); 3441 os::close(fd); 3442 return JNI_ERR; 3443 } 3444 3445 if (stbuf.st_size == 0) { 3446 // tell caller there is no option data and that is ok 3447 os::close(fd); 3448 return JNI_OK; 3449 } 3450 3451 // '+ 1' for NULL termination even with max bytes 3452 size_t bytes_alloc = stbuf.st_size + 1; 3453 3454 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3455 if (NULL == buf) { 3456 jio_fprintf(defaultStream::error_stream(), 3457 "Could not allocate read buffer for options file parse\n"); 3458 os::close(fd); 3459 return JNI_ENOMEM; 3460 } 3461 3462 memset(buf, 0, bytes_alloc); 3463 3464 // Fill buffer 3465 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc); 3466 os::close(fd); 3467 if (bytes_read < 0) { 3468 FREE_C_HEAP_ARRAY(char, buf); 3469 jio_fprintf(defaultStream::error_stream(), 3470 "Could not read options file '%s'\n", file_name); 3471 return JNI_ERR; 3472 } 3473 3474 if (bytes_read == 0) { 3475 // tell caller there is no option data and that is ok 3476 FREE_C_HEAP_ARRAY(char, buf); 3477 return JNI_OK; 3478 } 3479 3480 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3481 3482 FREE_C_HEAP_ARRAY(char, buf); 3483 return retcode; 3484 } 3485 3486 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3487 // Construct option array 3488 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3489 3490 // some pointers to help with parsing 3491 char *buffer_end = buffer + buf_len; 3492 char *opt_hd = buffer; 3493 char *wrt = buffer; 3494 char *rd = buffer; 3495 3496 // parse all options 3497 while (rd < buffer_end) { 3498 // skip leading white space from the input string 3499 while (rd < buffer_end && isspace(*rd)) { 3500 rd++; 3501 } 3502 3503 if (rd >= buffer_end) { 3504 break; 3505 } 3506 3507 // Remember this is where we found the head of the token. 3508 opt_hd = wrt; 3509 3510 // Tokens are strings of non white space characters separated 3511 // by one or more white spaces. 3512 while (rd < buffer_end && !isspace(*rd)) { 3513 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3514 int quote = *rd; // matching quote to look for 3515 rd++; // don't copy open quote 3516 while (rd < buffer_end && *rd != quote) { 3517 // include everything (even spaces) 3518 // up until the close quote 3519 *wrt++ = *rd++; // copy to option string 3520 } 3521 3522 if (rd < buffer_end) { 3523 rd++; // don't copy close quote 3524 } else { 3525 // did not see closing quote 3526 jio_fprintf(defaultStream::error_stream(), 3527 "Unmatched quote in %s\n", name); 3528 return JNI_ERR; 3529 } 3530 } else { 3531 *wrt++ = *rd++; // copy to option string 3532 } 3533 } 3534 3535 // steal a white space character and set it to NULL 3536 *wrt++ = '\0'; 3537 // We now have a complete token 3538 3539 JavaVMOption option; 3540 option.optionString = opt_hd; 3541 option.extraInfo = NULL; 3542 3543 options.append(option); // Fill in option 3544 3545 rd++; // Advance to next character 3546 } 3547 3548 // Fill out JavaVMInitArgs structure. 3549 return vm_args->set_args(&options); 3550 } 3551 3552 jint Arguments::set_shared_spaces_flags_and_archive_paths() { 3553 if (DumpSharedSpaces) { 3554 if (RequireSharedSpaces) { 3555 warning("Cannot dump shared archive while using shared archive"); 3556 } 3557 UseSharedSpaces = false; 3558 } 3559 #if INCLUDE_CDS 3560 // Initialize shared archive paths which could include both base and dynamic archive paths 3561 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly. 3562 if (!init_shared_archive_paths()) { 3563 return JNI_ENOMEM; 3564 } 3565 #endif // INCLUDE_CDS 3566 return JNI_OK; 3567 } 3568 3569 #if INCLUDE_CDS 3570 // Sharing support 3571 // Construct the path to the archive 3572 char* Arguments::get_default_shared_archive_path() { 3573 char *default_archive_path; 3574 char jvm_path[JVM_MAXPATHLEN]; 3575 os::jvm_path(jvm_path, sizeof(jvm_path)); 3576 char *end = strrchr(jvm_path, *os::file_separator()); 3577 if (end != NULL) *end = '\0'; 3578 size_t jvm_path_len = strlen(jvm_path); 3579 size_t file_sep_len = strlen(os::file_separator()); 3580 const size_t len = jvm_path_len + file_sep_len + 20; 3581 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3582 jio_snprintf(default_archive_path, len, 3583 UseCompressedOops ? "%s%sclasses.jsa": "%s%sclasses_nocoops.jsa", 3584 jvm_path, os::file_separator()); 3585 return default_archive_path; 3586 } 3587 3588 int Arguments::num_archives(const char* archive_path) { 3589 if (archive_path == NULL) { 3590 return 0; 3591 } 3592 int npaths = 1; 3593 char* p = (char*)archive_path; 3594 while (*p != '\0') { 3595 if (*p == os::path_separator()[0]) { 3596 npaths++; 3597 } 3598 p++; 3599 } 3600 return npaths; 3601 } 3602 3603 void Arguments::extract_shared_archive_paths(const char* archive_path, 3604 char** base_archive_path, 3605 char** top_archive_path) { 3606 char* begin_ptr = (char*)archive_path; 3607 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3608 if (end_ptr == NULL || end_ptr == begin_ptr) { 3609 vm_exit_during_initialization("Base archive was not specified", archive_path); 3610 } 3611 size_t len = end_ptr - begin_ptr; 3612 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3613 strncpy(cur_path, begin_ptr, len); 3614 cur_path[len] = '\0'; 3615 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/); 3616 *base_archive_path = cur_path; 3617 3618 begin_ptr = ++end_ptr; 3619 if (*begin_ptr == '\0') { 3620 vm_exit_during_initialization("Top archive was not specified", archive_path); 3621 } 3622 end_ptr = strchr(begin_ptr, '\0'); 3623 assert(end_ptr != NULL, "sanity"); 3624 len = end_ptr - begin_ptr; 3625 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3626 strncpy(cur_path, begin_ptr, len + 1); 3627 //cur_path[len] = '\0'; 3628 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/); 3629 *top_archive_path = cur_path; 3630 } 3631 3632 bool Arguments::init_shared_archive_paths() { 3633 if (ArchiveClassesAtExit != NULL) { 3634 if (DumpSharedSpaces) { 3635 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3636 } 3637 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) { 3638 return false; 3639 } 3640 check_unsupported_dumping_properties(); 3641 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments); 3642 } 3643 if (SharedArchiveFile == NULL) { 3644 SharedArchivePath = get_default_shared_archive_path(); 3645 } else { 3646 int archives = num_archives(SharedArchiveFile); 3647 if (is_dumping_archive()) { 3648 if (archives > 1) { 3649 vm_exit_during_initialization( 3650 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3651 } 3652 if (DynamicDumpSharedSpaces) { 3653 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3654 vm_exit_during_initialization( 3655 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3656 SharedArchiveFile); 3657 } 3658 } 3659 } 3660 if (!is_dumping_archive()){ 3661 if (archives > 2) { 3662 vm_exit_during_initialization( 3663 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3664 } 3665 if (archives == 1) { 3666 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3667 int name_size; 3668 bool success = 3669 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath); 3670 if (!success) { 3671 SharedArchivePath = temp_archive_path; 3672 } else { 3673 SharedDynamicArchivePath = temp_archive_path; 3674 } 3675 } else { 3676 extract_shared_archive_paths((const char*)SharedArchiveFile, 3677 &SharedArchivePath, &SharedDynamicArchivePath); 3678 } 3679 } else { // CDS dumping 3680 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3681 } 3682 } 3683 return (SharedArchivePath != NULL); 3684 } 3685 #endif // INCLUDE_CDS 3686 3687 #ifndef PRODUCT 3688 // Determine whether LogVMOutput should be implicitly turned on. 3689 static bool use_vm_log() { 3690 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3691 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3692 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3693 PrintAssembly || TraceDeoptimization || TraceDependencies || 3694 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3695 return true; 3696 } 3697 3698 #ifdef COMPILER1 3699 if (PrintC1Statistics) { 3700 return true; 3701 } 3702 #endif // COMPILER1 3703 3704 #ifdef COMPILER2 3705 if (PrintOptoAssembly || PrintOptoStatistics) { 3706 return true; 3707 } 3708 #endif // COMPILER2 3709 3710 return false; 3711 } 3712 3713 #endif // PRODUCT 3714 3715 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3716 for (int index = 0; index < args->nOptions; index++) { 3717 const JavaVMOption* option = args->options + index; 3718 const char* tail; 3719 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3720 return true; 3721 } 3722 } 3723 return false; 3724 } 3725 3726 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3727 const char* vm_options_file, 3728 const int vm_options_file_pos, 3729 ScopedVMInitArgs* vm_options_file_args, 3730 ScopedVMInitArgs* args_out) { 3731 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3732 if (code != JNI_OK) { 3733 return code; 3734 } 3735 3736 if (vm_options_file_args->get()->nOptions < 1) { 3737 return JNI_OK; 3738 } 3739 3740 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3741 jio_fprintf(defaultStream::error_stream(), 3742 "A VM options file may not refer to a VM options file. " 3743 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3744 "options file '%s' in options container '%s' is an error.\n", 3745 vm_options_file_args->vm_options_file_arg(), 3746 vm_options_file_args->container_name()); 3747 return JNI_EINVAL; 3748 } 3749 3750 return args_out->insert(args, vm_options_file_args->get(), 3751 vm_options_file_pos); 3752 } 3753 3754 // Expand -XX:VMOptionsFile found in args_in as needed. 3755 // mod_args and args_out parameters may return values as needed. 3756 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3757 ScopedVMInitArgs* mod_args, 3758 JavaVMInitArgs** args_out) { 3759 jint code = match_special_option_and_act(args_in, mod_args); 3760 if (code != JNI_OK) { 3761 return code; 3762 } 3763 3764 if (mod_args->is_set()) { 3765 // args_in contains -XX:VMOptionsFile and mod_args contains the 3766 // original options from args_in along with the options expanded 3767 // from the VMOptionsFile. Return a short-hand to the caller. 3768 *args_out = mod_args->get(); 3769 } else { 3770 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3771 } 3772 return JNI_OK; 3773 } 3774 3775 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3776 ScopedVMInitArgs* args_out) { 3777 // Remaining part of option string 3778 const char* tail; 3779 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3780 3781 for (int index = 0; index < args->nOptions; index++) { 3782 const JavaVMOption* option = args->options + index; 3783 if (match_option(option, "-XX:Flags=", &tail)) { 3784 Arguments::set_jvm_flags_file(tail); 3785 continue; 3786 } 3787 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3788 if (vm_options_file_args.found_vm_options_file_arg()) { 3789 jio_fprintf(defaultStream::error_stream(), 3790 "The option '%s' is already specified in the options " 3791 "container '%s' so the specification of '%s' in the " 3792 "same options container is an error.\n", 3793 vm_options_file_args.vm_options_file_arg(), 3794 vm_options_file_args.container_name(), 3795 option->optionString); 3796 return JNI_EINVAL; 3797 } 3798 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3799 // If there's a VMOptionsFile, parse that 3800 jint code = insert_vm_options_file(args, tail, index, 3801 &vm_options_file_args, args_out); 3802 if (code != JNI_OK) { 3803 return code; 3804 } 3805 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3806 if (args_out->is_set()) { 3807 // The VMOptions file inserted some options so switch 'args' 3808 // to the new set of options, and continue processing which 3809 // preserves "last option wins" semantics. 3810 args = args_out->get(); 3811 // The first option from the VMOptionsFile replaces the 3812 // current option. So we back track to process the 3813 // replacement option. 3814 index--; 3815 } 3816 continue; 3817 } 3818 if (match_option(option, "-XX:+PrintVMOptions")) { 3819 PrintVMOptions = true; 3820 continue; 3821 } 3822 if (match_option(option, "-XX:-PrintVMOptions")) { 3823 PrintVMOptions = false; 3824 continue; 3825 } 3826 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3827 IgnoreUnrecognizedVMOptions = true; 3828 continue; 3829 } 3830 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3831 IgnoreUnrecognizedVMOptions = false; 3832 continue; 3833 } 3834 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3835 JVMFlag::printFlags(tty, false); 3836 vm_exit(0); 3837 } 3838 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3839 #if INCLUDE_NMT 3840 // The launcher did not setup nmt environment variable properly. 3841 if (!MemTracker::check_launcher_nmt_support(tail)) { 3842 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3843 } 3844 3845 // Verify if nmt option is valid. 3846 if (MemTracker::verify_nmt_option()) { 3847 // Late initialization, still in single-threaded mode. 3848 if (MemTracker::tracking_level() >= NMT_summary) { 3849 MemTracker::init(); 3850 } 3851 } else { 3852 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3853 } 3854 continue; 3855 #else 3856 jio_fprintf(defaultStream::error_stream(), 3857 "Native Memory Tracking is not supported in this VM\n"); 3858 return JNI_ERR; 3859 #endif 3860 } 3861 3862 #ifndef PRODUCT 3863 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3864 JVMFlag::printFlags(tty, true); 3865 vm_exit(0); 3866 } 3867 #endif 3868 } 3869 return JNI_OK; 3870 } 3871 3872 static void print_options(const JavaVMInitArgs *args) { 3873 const char* tail; 3874 for (int index = 0; index < args->nOptions; index++) { 3875 const JavaVMOption *option = args->options + index; 3876 if (match_option(option, "-XX:", &tail)) { 3877 logOption(tail); 3878 } 3879 } 3880 } 3881 3882 bool Arguments::handle_deprecated_print_gc_flags() { 3883 if (PrintGC) { 3884 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3885 } 3886 if (PrintGCDetails) { 3887 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3888 } 3889 3890 if (_gc_log_filename != NULL) { 3891 // -Xloggc was used to specify a filename 3892 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3893 3894 LogTarget(Error, logging) target; 3895 LogStream errstream(target); 3896 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 3897 } else if (PrintGC || PrintGCDetails) { 3898 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3899 } 3900 return true; 3901 } 3902 3903 // Parse entry point called from JNI_CreateJavaVM 3904 3905 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3906 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3907 3908 // Initialize ranges and constraints 3909 JVMFlagRangeList::init(); 3910 JVMFlagConstraintList::init(); 3911 3912 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3913 const char* hotspotrc = ".hotspotrc"; 3914 bool settings_file_specified = false; 3915 bool needs_hotspotrc_warning = false; 3916 ScopedVMInitArgs initial_vm_options_args(""); 3917 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3918 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3919 3920 // Pointers to current working set of containers 3921 JavaVMInitArgs* cur_cmd_args; 3922 JavaVMInitArgs* cur_vm_options_args; 3923 JavaVMInitArgs* cur_java_options_args; 3924 JavaVMInitArgs* cur_java_tool_options_args; 3925 3926 // Containers for modified/expanded options 3927 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3928 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3929 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3930 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3931 3932 3933 jint code = 3934 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3935 if (code != JNI_OK) { 3936 return code; 3937 } 3938 3939 code = parse_java_options_environment_variable(&initial_java_options_args); 3940 if (code != JNI_OK) { 3941 return code; 3942 } 3943 3944 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3945 char *vmoptions = ClassLoader::lookup_vm_options(); 3946 if (vmoptions != NULL) { 3947 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3948 FREE_C_HEAP_ARRAY(char, vmoptions); 3949 if (code != JNI_OK) { 3950 return code; 3951 } 3952 } 3953 3954 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3955 &mod_java_tool_options_args, 3956 &cur_java_tool_options_args); 3957 if (code != JNI_OK) { 3958 return code; 3959 } 3960 3961 code = expand_vm_options_as_needed(initial_cmd_args, 3962 &mod_cmd_args, 3963 &cur_cmd_args); 3964 if (code != JNI_OK) { 3965 return code; 3966 } 3967 3968 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3969 &mod_java_options_args, 3970 &cur_java_options_args); 3971 if (code != JNI_OK) { 3972 return code; 3973 } 3974 3975 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3976 &mod_vm_options_args, 3977 &cur_vm_options_args); 3978 if (code != JNI_OK) { 3979 return code; 3980 } 3981 3982 const char* flags_file = Arguments::get_jvm_flags_file(); 3983 settings_file_specified = (flags_file != NULL); 3984 3985 if (IgnoreUnrecognizedVMOptions) { 3986 cur_cmd_args->ignoreUnrecognized = true; 3987 cur_java_tool_options_args->ignoreUnrecognized = true; 3988 cur_java_options_args->ignoreUnrecognized = true; 3989 } 3990 3991 // Parse specified settings file 3992 if (settings_file_specified) { 3993 if (!process_settings_file(flags_file, true, 3994 cur_cmd_args->ignoreUnrecognized)) { 3995 return JNI_EINVAL; 3996 } 3997 } else { 3998 #ifdef ASSERT 3999 // Parse default .hotspotrc settings file 4000 if (!process_settings_file(".hotspotrc", false, 4001 cur_cmd_args->ignoreUnrecognized)) { 4002 return JNI_EINVAL; 4003 } 4004 #else 4005 struct stat buf; 4006 if (os::stat(hotspotrc, &buf) == 0) { 4007 needs_hotspotrc_warning = true; 4008 } 4009 #endif 4010 } 4011 4012 if (PrintVMOptions) { 4013 print_options(cur_java_tool_options_args); 4014 print_options(cur_cmd_args); 4015 print_options(cur_java_options_args); 4016 } 4017 4018 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4019 jint result = parse_vm_init_args(cur_vm_options_args, 4020 cur_java_tool_options_args, 4021 cur_java_options_args, 4022 cur_cmd_args); 4023 4024 if (result != JNI_OK) { 4025 return result; 4026 } 4027 4028 // Delay warning until here so that we've had a chance to process 4029 // the -XX:-PrintWarnings flag 4030 if (needs_hotspotrc_warning) { 4031 warning("%s file is present but has been ignored. " 4032 "Run with -XX:Flags=%s to load the file.", 4033 hotspotrc, hotspotrc); 4034 } 4035 4036 if (needs_module_property_warning) { 4037 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4038 " names that are reserved for internal use."); 4039 } 4040 4041 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4042 UNSUPPORTED_OPTION(UseLargePages); 4043 #endif 4044 4045 #if defined(AIX) 4046 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 4047 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt); 4048 #endif 4049 4050 #ifndef PRODUCT 4051 if (TraceBytecodesAt != 0) { 4052 TraceBytecodes = true; 4053 } 4054 if (CountCompiledCalls) { 4055 if (UseCounterDecay) { 4056 warning("UseCounterDecay disabled because CountCalls is set"); 4057 UseCounterDecay = false; 4058 } 4059 } 4060 #endif // PRODUCT 4061 4062 if (ScavengeRootsInCode == 0) { 4063 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4064 warning("Forcing ScavengeRootsInCode non-zero"); 4065 } 4066 ScavengeRootsInCode = 1; 4067 } 4068 4069 if (!handle_deprecated_print_gc_flags()) { 4070 return JNI_EINVAL; 4071 } 4072 4073 // Set object alignment values. 4074 set_object_alignment(); 4075 4076 #if !INCLUDE_CDS 4077 if (DumpSharedSpaces || RequireSharedSpaces) { 4078 jio_fprintf(defaultStream::error_stream(), 4079 "Shared spaces are not supported in this VM\n"); 4080 return JNI_ERR; 4081 } 4082 if (DumpLoadedClassList != NULL) { 4083 jio_fprintf(defaultStream::error_stream(), 4084 "DumpLoadedClassList is not supported in this VM\n"); 4085 return JNI_ERR; 4086 } 4087 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 4088 log_is_enabled(Info, cds)) { 4089 warning("Shared spaces are not supported in this VM"); 4090 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4091 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4092 } 4093 no_shared_spaces("CDS Disabled"); 4094 #endif // INCLUDE_CDS 4095 4096 #ifndef TIERED 4097 if (FLAG_IS_CMDLINE(CompilationMode)) { 4098 warning("CompilationMode has no effect in non-tiered VMs"); 4099 } 4100 #endif 4101 4102 return JNI_OK; 4103 } 4104 4105 jint Arguments::apply_ergo() { 4106 // Set flags based on ergonomics. 4107 jint result = set_ergonomics_flags(); 4108 if (result != JNI_OK) return result; 4109 4110 // Set heap size based on available physical memory 4111 set_heap_size(); 4112 4113 GCConfig::arguments()->initialize(); 4114 4115 result = set_shared_spaces_flags_and_archive_paths(); 4116 if (result != JNI_OK) return result; 4117 4118 // Initialize Metaspace flags and alignments 4119 Metaspace::ergo_initialize(); 4120 4121 // Set compiler flags after GC is selected and GC specific 4122 // flags (LoopStripMiningIter) are set. 4123 CompilerConfig::ergo_initialize(); 4124 4125 // Set bytecode rewriting flags 4126 set_bytecode_flags(); 4127 4128 // Set flags if aggressive optimization flags are enabled 4129 jint code = set_aggressive_opts_flags(); 4130 if (code != JNI_OK) { 4131 return code; 4132 } 4133 4134 // Turn off biased locking for locking debug mode flags, 4135 // which are subtly different from each other but neither works with 4136 // biased locking 4137 if (UseHeavyMonitors 4138 #ifdef COMPILER1 4139 || !UseFastLocking 4140 #endif // COMPILER1 4141 #if INCLUDE_JVMCI 4142 || !JVMCIUseFastLocking 4143 #endif 4144 ) { 4145 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4146 // flag set to true on command line; warn the user that they 4147 // can't enable biased locking here 4148 warning("Biased Locking is not supported with locking debug flags" 4149 "; ignoring UseBiasedLocking flag." ); 4150 } 4151 UseBiasedLocking = false; 4152 } 4153 4154 #ifdef ZERO 4155 // Clear flags not supported on zero. 4156 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4157 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4158 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4159 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4160 #endif // ZERO 4161 4162 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4163 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4164 DebugNonSafepoints = true; 4165 } 4166 4167 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4168 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4169 } 4170 4171 // Treat the odd case where local verification is enabled but remote 4172 // verification is not as if both were enabled. 4173 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4174 log_info(verification)("Turning on remote verification because local verification is on"); 4175 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4176 } 4177 4178 #ifndef PRODUCT 4179 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4180 if (use_vm_log()) { 4181 LogVMOutput = true; 4182 } 4183 } 4184 #endif // PRODUCT 4185 4186 if (PrintCommandLineFlags) { 4187 JVMFlag::printSetFlags(tty); 4188 } 4189 4190 // Apply CPU specific policy for the BiasedLocking 4191 if (UseBiasedLocking) { 4192 if (!VM_Version::use_biased_locking() && 4193 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4194 UseBiasedLocking = false; 4195 } 4196 } 4197 #ifdef COMPILER2 4198 if (!UseBiasedLocking) { 4199 UseOptoBiasInlining = false; 4200 } 4201 #endif 4202 4203 if (FLAG_IS_CMDLINE(DiagnoseSyncOnPrimitiveWrappers)) { 4204 if (DiagnoseSyncOnPrimitiveWrappers == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, primitivewrappers)) { 4205 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(primitivewrappers)); 4206 } 4207 } 4208 return JNI_OK; 4209 } 4210 4211 jint Arguments::adjust_after_os() { 4212 if (UseNUMA) { 4213 if (UseParallelGC) { 4214 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4215 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4216 } 4217 } 4218 } 4219 return JNI_OK; 4220 } 4221 4222 int Arguments::PropertyList_count(SystemProperty* pl) { 4223 int count = 0; 4224 while(pl != NULL) { 4225 count++; 4226 pl = pl->next(); 4227 } 4228 return count; 4229 } 4230 4231 // Return the number of readable properties. 4232 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4233 int count = 0; 4234 while(pl != NULL) { 4235 if (pl->is_readable()) { 4236 count++; 4237 } 4238 pl = pl->next(); 4239 } 4240 return count; 4241 } 4242 4243 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4244 assert(key != NULL, "just checking"); 4245 SystemProperty* prop; 4246 for (prop = pl; prop != NULL; prop = prop->next()) { 4247 if (strcmp(key, prop->key()) == 0) return prop->value(); 4248 } 4249 return NULL; 4250 } 4251 4252 // Return the value of the requested property provided that it is a readable property. 4253 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4254 assert(key != NULL, "just checking"); 4255 SystemProperty* prop; 4256 // Return the property value if the keys match and the property is not internal or 4257 // it's the special internal property "jdk.boot.class.path.append". 4258 for (prop = pl; prop != NULL; prop = prop->next()) { 4259 if (strcmp(key, prop->key()) == 0) { 4260 if (!prop->internal()) { 4261 return prop->value(); 4262 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4263 return prop->value(); 4264 } else { 4265 // Property is internal and not jdk.boot.class.path.append so return NULL. 4266 return NULL; 4267 } 4268 } 4269 } 4270 return NULL; 4271 } 4272 4273 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4274 int count = 0; 4275 const char* ret_val = NULL; 4276 4277 while(pl != NULL) { 4278 if(count >= index) { 4279 ret_val = pl->key(); 4280 break; 4281 } 4282 count++; 4283 pl = pl->next(); 4284 } 4285 4286 return ret_val; 4287 } 4288 4289 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4290 int count = 0; 4291 char* ret_val = NULL; 4292 4293 while(pl != NULL) { 4294 if(count >= index) { 4295 ret_val = pl->value(); 4296 break; 4297 } 4298 count++; 4299 pl = pl->next(); 4300 } 4301 4302 return ret_val; 4303 } 4304 4305 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4306 SystemProperty* p = *plist; 4307 if (p == NULL) { 4308 *plist = new_p; 4309 } else { 4310 while (p->next() != NULL) { 4311 p = p->next(); 4312 } 4313 p->set_next(new_p); 4314 } 4315 } 4316 4317 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4318 bool writeable, bool internal) { 4319 if (plist == NULL) 4320 return; 4321 4322 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4323 PropertyList_add(plist, new_p); 4324 } 4325 4326 void Arguments::PropertyList_add(SystemProperty *element) { 4327 PropertyList_add(&_system_properties, element); 4328 } 4329 4330 // This add maintains unique property key in the list. 4331 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4332 PropertyAppendable append, PropertyWriteable writeable, 4333 PropertyInternal internal) { 4334 if (plist == NULL) 4335 return; 4336 4337 // If property key exists and is writeable, then update with new value. 4338 // Trying to update a non-writeable property is silently ignored. 4339 SystemProperty* prop; 4340 for (prop = *plist; prop != NULL; prop = prop->next()) { 4341 if (strcmp(k, prop->key()) == 0) { 4342 if (append == AppendProperty) { 4343 prop->append_writeable_value(v); 4344 } else { 4345 prop->set_writeable_value(v); 4346 } 4347 return; 4348 } 4349 } 4350 4351 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4352 } 4353 4354 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4355 // Returns true if all of the source pointed by src has been copied over to 4356 // the destination buffer pointed by buf. Otherwise, returns false. 4357 // Notes: 4358 // 1. If the length (buflen) of the destination buffer excluding the 4359 // NULL terminator character is not long enough for holding the expanded 4360 // pid characters, it also returns false instead of returning the partially 4361 // expanded one. 4362 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4363 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4364 char* buf, size_t buflen) { 4365 const char* p = src; 4366 char* b = buf; 4367 const char* src_end = &src[srclen]; 4368 char* buf_end = &buf[buflen - 1]; 4369 4370 while (p < src_end && b < buf_end) { 4371 if (*p == '%') { 4372 switch (*(++p)) { 4373 case '%': // "%%" ==> "%" 4374 *b++ = *p++; 4375 break; 4376 case 'p': { // "%p" ==> current process id 4377 // buf_end points to the character before the last character so 4378 // that we could write '\0' to the end of the buffer. 4379 size_t buf_sz = buf_end - b + 1; 4380 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4381 4382 // if jio_snprintf fails or the buffer is not long enough to hold 4383 // the expanded pid, returns false. 4384 if (ret < 0 || ret >= (int)buf_sz) { 4385 return false; 4386 } else { 4387 b += ret; 4388 assert(*b == '\0', "fail in copy_expand_pid"); 4389 if (p == src_end && b == buf_end + 1) { 4390 // reach the end of the buffer. 4391 return true; 4392 } 4393 } 4394 p++; 4395 break; 4396 } 4397 default : 4398 *b++ = '%'; 4399 } 4400 } else { 4401 *b++ = *p++; 4402 } 4403 } 4404 *b = '\0'; 4405 return (p == src_end); // return false if not all of the source was copied 4406 }