1 /* 2 * Copyright (c) 1997, 2025, 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 "cds/aotLogging.hpp" 26 #include "cds/cds_globals.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/moduleEntry.hpp" 31 #include "classfile/stringTable.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "compiler/compilerDefinitions.hpp" 34 #include "gc/shared/gcArguments.hpp" 35 #include "gc/shared/gcConfig.hpp" 36 #include "gc/shared/genArguments.hpp" 37 #include "gc/shared/stringdedup/stringDedup.hpp" 38 #include "gc/shared/tlab_globals.hpp" 39 #include "jvm.h" 40 #include "logging/log.hpp" 41 #include "logging/logConfiguration.hpp" 42 #include "logging/logStream.hpp" 43 #include "logging/logTag.hpp" 44 #include "memory/allocation.inline.hpp" 45 #include "nmt/nmtCommon.hpp" 46 #include "oops/compressedKlass.hpp" 47 #include "oops/instanceKlass.hpp" 48 #include "oops/objLayout.hpp" 49 #include "oops/oop.inline.hpp" 50 #include "prims/jvmtiAgentList.hpp" 51 #include "prims/jvmtiExport.hpp" 52 #include "runtime/arguments.hpp" 53 #include "runtime/flags/jvmFlag.hpp" 54 #include "runtime/flags/jvmFlagAccess.hpp" 55 #include "runtime/flags/jvmFlagLimit.hpp" 56 #include "runtime/globals_extension.hpp" 57 #include "runtime/java.hpp" 58 #include "runtime/os.hpp" 59 #include "runtime/safepoint.hpp" 60 #include "runtime/safepointMechanism.hpp" 61 #include "runtime/synchronizer.hpp" 62 #include "runtime/vm_version.hpp" 63 #include "services/management.hpp" 64 #include "utilities/align.hpp" 65 #include "utilities/checkedCast.hpp" 66 #include "utilities/debug.hpp" 67 #include "utilities/defaultStream.hpp" 68 #include "utilities/macros.hpp" 69 #include "utilities/parseInteger.hpp" 70 #include "utilities/powerOfTwo.hpp" 71 #include "utilities/stringUtils.hpp" 72 #include "utilities/systemMemoryBarrier.hpp" 73 #if INCLUDE_JFR 74 #include "jfr/jfr.hpp" 75 #endif 76 77 #include <limits> 78 79 static const char _default_java_launcher[] = "generic"; 80 81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher 82 83 char* Arguments::_jvm_flags_file = nullptr; 84 char** Arguments::_jvm_flags_array = nullptr; 85 int Arguments::_num_jvm_flags = 0; 86 char** Arguments::_jvm_args_array = nullptr; 87 int Arguments::_num_jvm_args = 0; 88 unsigned int Arguments::_addmods_count = 0; 89 #if INCLUDE_JVMCI 90 bool Arguments::_jvmci_module_added = false; 91 #endif 92 char* Arguments::_java_command = nullptr; 93 SystemProperty* Arguments::_system_properties = nullptr; 94 size_t Arguments::_conservative_max_heap_alignment = 0; 95 Arguments::Mode Arguments::_mode = _mixed; 96 const char* Arguments::_java_vendor_url_bug = nullptr; 97 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 98 bool Arguments::_executing_unit_tests = false; 99 100 // These parameters are reset in method parse_vm_init_args() 101 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 102 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 103 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 104 bool Arguments::_ClipInlining = ClipInlining; 105 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 106 107 bool Arguments::_enable_preview = false; 108 bool Arguments::_has_jdwp_agent = false; 109 110 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 }; 111 112 // These are not set by the JDK's built-in launchers, but they can be set by 113 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 114 // JavaVMOption in jni.h. 115 abort_hook_t Arguments::_abort_hook = nullptr; 116 exit_hook_t Arguments::_exit_hook = nullptr; 117 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr; 118 119 120 SystemProperty *Arguments::_sun_boot_library_path = nullptr; 121 SystemProperty *Arguments::_java_library_path = nullptr; 122 SystemProperty *Arguments::_java_home = nullptr; 123 SystemProperty *Arguments::_java_class_path = nullptr; 124 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr; 125 SystemProperty *Arguments::_vm_info = nullptr; 126 127 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr; 128 PathString *Arguments::_boot_class_path = nullptr; 129 bool Arguments::_has_jimage = false; 130 131 char* Arguments::_ext_dirs = nullptr; 132 133 // True if -Xshare:auto option was specified. 134 static bool xshare_auto_cmd_line = false; 135 136 // True if -Xint/-Xmixed/-Xcomp were specified 137 static bool mode_flag_cmd_line = false; 138 139 struct VMInitArgsGroup { 140 const JavaVMInitArgs* _args; 141 JVMFlagOrigin _origin; 142 }; 143 144 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 145 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 146 if (new_value == nullptr) { 147 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 148 return false; 149 } 150 if (_value != nullptr) { 151 FreeHeap(_value); 152 } 153 _value = new_value; 154 strcpy(_value, value); 155 return true; 156 } 157 158 void PathString::append_value(const char *value) { 159 char *sp; 160 size_t len = 0; 161 if (value != nullptr) { 162 len = strlen(value); 163 if (_value != nullptr) { 164 len += strlen(_value); 165 } 166 sp = AllocateHeap(len+2, mtArguments); 167 assert(sp != nullptr, "Unable to allocate space for new append path value"); 168 if (sp != nullptr) { 169 if (_value != nullptr) { 170 strcpy(sp, _value); 171 strcat(sp, os::path_separator()); 172 strcat(sp, value); 173 FreeHeap(_value); 174 } else { 175 strcpy(sp, value); 176 } 177 _value = sp; 178 } 179 } 180 } 181 182 PathString::PathString(const char* value) { 183 if (value == nullptr) { 184 _value = nullptr; 185 } else { 186 _value = AllocateHeap(strlen(value)+1, mtArguments); 187 strcpy(_value, value); 188 } 189 } 190 191 PathString::~PathString() { 192 if (_value != nullptr) { 193 FreeHeap(_value); 194 _value = nullptr; 195 } 196 } 197 198 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 199 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value"); 200 size_t len = strlen(module_name) + 1; 201 _module_name = AllocateHeap(len, mtInternal); 202 strncpy(_module_name, module_name, len); // copy the trailing null 203 _path = new PathString(path); 204 } 205 206 ModulePatchPath::~ModulePatchPath() { 207 if (_module_name != nullptr) { 208 FreeHeap(_module_name); 209 _module_name = nullptr; 210 } 211 if (_path != nullptr) { 212 delete _path; 213 _path = nullptr; 214 } 215 } 216 217 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 218 if (key == nullptr) { 219 _key = nullptr; 220 } else { 221 _key = AllocateHeap(strlen(key)+1, mtArguments); 222 strcpy(_key, key); 223 } 224 _next = nullptr; 225 _internal = internal; 226 _writeable = writeable; 227 } 228 229 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 230 // part of the option string. 231 static bool match_option(const JavaVMOption *option, const char* name, 232 const char** tail) { 233 size_t len = strlen(name); 234 if (strncmp(option->optionString, name, len) == 0) { 235 *tail = option->optionString + len; 236 return true; 237 } else { 238 return false; 239 } 240 } 241 242 // Check if 'option' matches 'name'. No "tail" is allowed. 243 static bool match_option(const JavaVMOption *option, const char* name) { 244 const char* tail = nullptr; 245 bool result = match_option(option, name, &tail); 246 if (tail != nullptr && *tail == '\0') { 247 return result; 248 } else { 249 return false; 250 } 251 } 252 253 // Return true if any of the strings in null-terminated array 'names' matches. 254 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 255 // the option must match exactly. 256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 257 bool tail_allowed) { 258 for (/* empty */; *names != nullptr; ++names) { 259 if (match_option(option, *names, tail)) { 260 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 261 return true; 262 } 263 } 264 } 265 return false; 266 } 267 268 #if INCLUDE_JFR 269 static bool _has_jfr_option = false; // is using JFR 270 271 // return true on failure 272 static bool match_jfr_option(const JavaVMOption** option) { 273 assert((*option)->optionString != nullptr, "invariant"); 274 char* tail = nullptr; 275 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 276 _has_jfr_option = true; 277 return Jfr::on_start_flight_recording_option(option, tail); 278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 279 _has_jfr_option = true; 280 return Jfr::on_flight_recorder_option(option, tail); 281 } 282 return false; 283 } 284 285 bool Arguments::has_jfr_option() { 286 return _has_jfr_option; 287 } 288 #endif 289 290 static void logOption(const char* opt) { 291 if (PrintVMOptions) { 292 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 293 } 294 } 295 296 bool needs_module_property_warning = false; 297 298 #define MODULE_PROPERTY_PREFIX "jdk.module." 299 #define MODULE_PROPERTY_PREFIX_LEN 11 300 #define ADDEXPORTS "addexports" 301 #define ADDEXPORTS_LEN 10 302 #define ADDREADS "addreads" 303 #define ADDREADS_LEN 8 304 #define ADDOPENS "addopens" 305 #define ADDOPENS_LEN 8 306 #define PATCH "patch" 307 #define PATCH_LEN 5 308 #define ADDMODS "addmods" 309 #define ADDMODS_LEN 7 310 #define LIMITMODS "limitmods" 311 #define LIMITMODS_LEN 9 312 #define PATH "path" 313 #define PATH_LEN 4 314 #define UPGRADE_PATH "upgrade.path" 315 #define UPGRADE_PATH_LEN 12 316 #define ENABLE_NATIVE_ACCESS "enable.native.access" 317 #define ENABLE_NATIVE_ACCESS_LEN 20 318 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access" 319 #define ILLEGAL_NATIVE_ACCESS_LEN 21 320 321 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 322 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 323 return ((strncmp(option, property, len) == 0) && 324 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 325 } 326 327 // Return true if property starts with "jdk.module." and its ensuing chars match 328 // any of the reserved module properties. 329 // property should be passed without the leading "-D". 330 bool Arguments::is_internal_module_property(const char* property) { 331 return internal_module_property_helper(property, false); 332 } 333 334 // Returns true if property is one of those recognized by is_internal_module_property() but 335 // is not supported by CDS archived full module graph. 336 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) { 337 return internal_module_property_helper(property, true); 338 } 339 340 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) { 341 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 342 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 343 if (matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 344 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 345 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 346 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) { 347 return true; 348 } 349 350 if (!check_for_cds) { 351 // CDS notes: these properties are supported by CDS archived full module graph. 352 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 353 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 354 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 355 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 356 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 357 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 358 return true; 359 } 360 } 361 } 362 return false; 363 } 364 365 // Process java launcher properties. 366 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 367 // See if sun.java.launcher is defined. 368 // Must do this before setting up other system properties, 369 // as some of them may depend on launcher type. 370 for (int index = 0; index < args->nOptions; index++) { 371 const JavaVMOption* option = args->options + index; 372 const char* tail; 373 374 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 375 process_java_launcher_argument(tail, option->extraInfo); 376 continue; 377 } 378 if (match_option(option, "-XX:+ExecutingUnitTests")) { 379 _executing_unit_tests = true; 380 continue; 381 } 382 } 383 } 384 385 // Initialize system properties key and value. 386 void Arguments::init_system_properties() { 387 388 // Set up _boot_class_path which is not a property but 389 // relies heavily on argument processing and the jdk.boot.class.path.append 390 // property. It is used to store the underlying boot class path. 391 _boot_class_path = new PathString(nullptr); 392 393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 394 "Java Virtual Machine Specification", false)); 395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 396 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 397 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 398 399 // Initialize the vm.info now, but it will need updating after argument parsing. 400 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 401 402 // Following are JVMTI agent writable properties. 403 // Properties values are set to nullptr and they are 404 // os specific they are initialized in os::init_system_properties_values(). 405 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true); 406 _java_library_path = new SystemProperty("java.library.path", nullptr, true); 407 _java_home = new SystemProperty("java.home", nullptr, true); 408 _java_class_path = new SystemProperty("java.class.path", "", true); 409 // jdk.boot.class.path.append is a non-writeable, internal property. 410 // It can only be set by either: 411 // - -Xbootclasspath/a: 412 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 413 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true); 414 415 // Add to System Property list. 416 PropertyList_add(&_system_properties, _sun_boot_library_path); 417 PropertyList_add(&_system_properties, _java_library_path); 418 PropertyList_add(&_system_properties, _java_home); 419 PropertyList_add(&_system_properties, _java_class_path); 420 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 421 PropertyList_add(&_system_properties, _vm_info); 422 423 // Set OS specific system properties values 424 os::init_system_properties_values(); 425 } 426 427 // Update/Initialize System properties after JDK version number is known 428 void Arguments::init_version_specific_system_properties() { 429 enum { bufsz = 16 }; 430 char buffer[bufsz]; 431 const char* spec_vendor = "Oracle Corporation"; 432 uint32_t spec_version = JDK_Version::current().major_version(); 433 434 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 435 436 PropertyList_add(&_system_properties, 437 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 438 PropertyList_add(&_system_properties, 439 new SystemProperty("java.vm.specification.version", buffer, false)); 440 PropertyList_add(&_system_properties, 441 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 442 } 443 444 /* 445 * -XX argument processing: 446 * 447 * -XX arguments are defined in several places, such as: 448 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 449 * -XX arguments are parsed in parse_argument(). 450 * -XX argument bounds checking is done in check_vm_args_consistency(). 451 * 452 * Over time -XX arguments may change. There are mechanisms to handle common cases: 453 * 454 * ALIASED: An option that is simply another name for another option. This is often 455 * part of the process of deprecating a flag, but not all aliases need 456 * to be deprecated. 457 * 458 * Create an alias for an option by adding the old and new option names to the 459 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 460 * 461 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 462 * support may be removed in the future. Both regular and aliased options may be 463 * deprecated. 464 * 465 * Add a deprecation warning for an option (or alias) by adding an entry in the 466 * "special_jvm_flags" table and setting the "deprecated_in" field. 467 * Often an option "deprecated" in one major release will 468 * be made "obsolete" in the next. In this case the entry should also have its 469 * "obsolete_in" field set. 470 * 471 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 472 * on the command line. A warning is printed to let the user know that option might not 473 * be accepted in the future. 474 * 475 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 476 * table and setting the "obsolete_in" field. 477 * 478 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 479 * to the current JDK version. The system will flatly refuse to admit the existence of 480 * the flag. This allows a flag to die automatically over JDK releases. 481 * 482 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 483 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 484 * - Newly obsolete or expired deprecated options should have their global variable 485 * definitions removed (from globals.hpp, etc) and related implementations removed. 486 * 487 * Recommended approach for removing options: 488 * 489 * To remove options commonly used by customers (e.g. product -XX options), use 490 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 491 * 492 * To remove internal options (e.g. diagnostic, experimental, develop options), use 493 * a 2-step model adding major release numbers to the obsolete and expire columns. 494 * 495 * To change the name of an option, use the alias table as well as a 2-step 496 * model adding major release numbers to the deprecate and expire columns. 497 * Think twice about aliasing commonly used customer options. 498 * 499 * There are times when it is appropriate to leave a future release number as undefined. 500 * 501 * Tests: Aliases should be tested in VMAliasOptions.java. 502 * Deprecated options should be tested in VMDeprecatedOptions.java. 503 */ 504 505 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 506 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 507 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 508 // the command-line as usual, but will issue a warning. 509 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 510 // the command-line, while issuing a warning and ignoring the flag value. 511 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 512 // existence of the flag. 513 // 514 // MANUAL CLEANUP ON JDK VERSION UPDATES: 515 // This table ensures that the handling of options will update automatically when the JDK 516 // version is incremented, but the source code needs to be cleanup up manually: 517 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 518 // variable should be removed, as well as users of the variable. 519 // - As "deprecated" options age into "obsolete" options, move the entry into the 520 // "Obsolete Flags" section of the table. 521 // - All expired options should be removed from the table. 522 static SpecialFlag const special_jvm_flags[] = { 523 // -------------- Deprecated Flags -------------- 524 // --- Non-alias flags - sorted by obsolete_in then expired_in: 525 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 526 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 527 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 528 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 529 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 530 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 531 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 532 #ifdef _LP64 533 { "UseCompressedClassPointers", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::undefined() }, 534 #endif 535 { "ParallelRefProcEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) }, 536 { "ParallelRefProcBalancingEnabled", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) }, 537 { "PSChunkLargeArrays", JDK_Version::jdk(26), JDK_Version::jdk(27), JDK_Version::jdk(28) }, 538 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 539 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 540 541 // -------------- Obsolete Flags - sorted by expired_in -------------- 542 543 #ifdef LINUX 544 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 545 #endif 546 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 547 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() }, 548 { "ZMarkStackSpaceLimit", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() }, 549 { "G1UpdateBufferSize", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 550 #if defined(AARCH64) 551 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() }, 552 #endif 553 554 { "AdaptiveSizeMajorGCDecayTimeScale", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 555 { "AdaptiveSizePolicyInitializingSteps", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 556 { "AdaptiveSizePolicyOutputInterval", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 557 { "AdaptiveSizeThroughPutPolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 558 { "AdaptiveTimeWeight", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 559 { "PausePadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 560 { "SurvivorPadding", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 561 { "TenuredGenerationSizeIncrement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 562 { "TenuredGenerationSizeSupplement", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 563 { "TenuredGenerationSizeSupplementDecay", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 564 { "UseAdaptiveGenerationSizePolicyAtMajorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 565 { "UseAdaptiveGenerationSizePolicyAtMinorCollection", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 566 { "UseAdaptiveSizeDecayMajorGCCost", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 567 { "UseAdaptiveSizePolicyFootprintGoal", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 568 { "UseAdaptiveSizePolicyWithSystemGC", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 569 { "UsePSAdaptiveSurvivorSizePolicy", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 570 571 { "PretenureSizeThreshold", JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 572 { "HeapMaximumCompactionInterval",JDK_Version::undefined(), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 573 574 #ifdef ASSERT 575 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 576 #endif 577 578 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 579 // These entries will generate build errors. Their purpose is to test the macros. 580 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 581 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 582 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 583 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 584 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 585 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 586 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 587 #endif 588 589 { nullptr, JDK_Version(0), JDK_Version(0) } 590 }; 591 592 // Flags that are aliases for other flags. 593 typedef struct { 594 const char* alias_name; 595 const char* real_name; 596 } AliasedFlag; 597 598 static AliasedFlag const aliased_jvm_flags[] = { 599 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 600 { nullptr, nullptr} 601 }; 602 603 // Return true if "v" is less than "other", where "other" may be "undefined". 604 static bool version_less_than(JDK_Version v, JDK_Version other) { 605 assert(!v.is_undefined(), "must be defined"); 606 if (!other.is_undefined() && v.compare(other) >= 0) { 607 return false; 608 } else { 609 return true; 610 } 611 } 612 613 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 614 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 615 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 616 flag = special_jvm_flags[i]; 617 return true; 618 } 619 } 620 return false; 621 } 622 623 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 624 assert(version != nullptr, "Must provide a version buffer"); 625 SpecialFlag flag; 626 if (lookup_special_flag(flag_name, flag)) { 627 if (!flag.obsolete_in.is_undefined()) { 628 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 629 *version = flag.obsolete_in; 630 // This flag may have been marked for obsoletion in this version, but we may not 631 // have actually removed it yet. Rather than ignoring it as soon as we reach 632 // this version we allow some time for the removal to happen. So if the flag 633 // still actually exists we process it as normal, but issue an adjusted warning. 634 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 635 if (real_flag != nullptr) { 636 char version_str[256]; 637 version->to_string(version_str, sizeof(version_str)); 638 warning("Temporarily processing option %s; support is scheduled for removal in %s", 639 flag_name, version_str); 640 return false; 641 } 642 return true; 643 } 644 } 645 } 646 return false; 647 } 648 649 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 650 assert(version != nullptr, "Must provide a version buffer"); 651 SpecialFlag flag; 652 if (lookup_special_flag(flag_name, flag)) { 653 if (!flag.deprecated_in.is_undefined()) { 654 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 655 version_less_than(JDK_Version::current(), flag.expired_in)) { 656 *version = flag.deprecated_in; 657 return 1; 658 } else { 659 return -1; 660 } 661 } 662 } 663 return 0; 664 } 665 666 const char* Arguments::real_flag_name(const char *flag_name) { 667 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) { 668 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 669 if (strcmp(flag_status.alias_name, flag_name) == 0) { 670 return flag_status.real_name; 671 } 672 } 673 return flag_name; 674 } 675 676 #ifdef ASSERT 677 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 678 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 679 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 680 return true; 681 } 682 } 683 return false; 684 } 685 686 // Verifies the correctness of the entries in the special_jvm_flags table. 687 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 688 // version being earlier than the deprecation version, then a warning is issued 689 // and verification fails - by returning false. If it is detected that the table 690 // is out of date, with respect to the current version, then ideally a warning is 691 // issued but verification does not fail. This allows the VM to operate when the 692 // version is first updated, without needing to update all the impacted flags at 693 // the same time. In practice we can't issue the warning immediately when the version 694 // is updated as it occurs for every test and some tests are not prepared to handle 695 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 696 // if the check_globals flag is true, and in addition allow a grace period and only 697 // check for stale flags when we hit build 25 (which is far enough into the 6 month 698 // release cycle that all flag updates should have been processed, whilst still 699 // leaving time to make the change before RDP2). 700 // We use a gtest to call this, passing true, so that we can detect stale flags before 701 // the end of the release cycle. 702 703 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 704 705 bool Arguments::verify_special_jvm_flags(bool check_globals) { 706 bool success = true; 707 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 708 const SpecialFlag& flag = special_jvm_flags[i]; 709 if (lookup_special_flag(flag.name, i)) { 710 warning("Duplicate special flag declaration \"%s\"", flag.name); 711 success = false; 712 } 713 if (flag.deprecated_in.is_undefined() && 714 flag.obsolete_in.is_undefined()) { 715 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 716 success = false; 717 } 718 719 if (!flag.deprecated_in.is_undefined()) { 720 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 721 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 722 success = false; 723 } 724 725 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 726 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 727 success = false; 728 } 729 } 730 731 if (!flag.obsolete_in.is_undefined()) { 732 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 733 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 734 success = false; 735 } 736 737 // if flag has become obsolete it should not have a "globals" flag defined anymore. 738 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 739 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 740 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 741 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 742 success = false; 743 } 744 } 745 746 } else if (!flag.expired_in.is_undefined()) { 747 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 748 success = false; 749 } 750 751 if (!flag.expired_in.is_undefined()) { 752 // if flag has become expired it should not have a "globals" flag defined anymore. 753 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 754 !version_less_than(JDK_Version::current(), flag.expired_in)) { 755 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 756 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 757 success = false; 758 } 759 } 760 } 761 } 762 return success; 763 } 764 #endif 765 766 bool Arguments::atojulong(const char *s, julong* result) { 767 return parse_integer(s, result); 768 } 769 770 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 771 if (size < min_size) return arg_too_small; 772 if (size > max_size) return arg_too_big; 773 return arg_in_range; 774 } 775 776 // Describe an argument out of range error 777 void Arguments::describe_range_error(ArgsRange errcode) { 778 switch(errcode) { 779 case arg_too_big: 780 jio_fprintf(defaultStream::error_stream(), 781 "The specified size exceeds the maximum " 782 "representable size.\n"); 783 break; 784 case arg_too_small: 785 case arg_unreadable: 786 case arg_in_range: 787 // do nothing for now 788 break; 789 default: 790 ShouldNotReachHere(); 791 } 792 } 793 794 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 795 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 796 return true; 797 } else { 798 return false; 799 } 800 } 801 802 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 803 // strtod allows leading whitespace, but our flag format does not. 804 if (*value == '\0' || isspace((unsigned char) *value)) { 805 return false; 806 } 807 char* end; 808 errno = 0; 809 double v = strtod(value, &end); 810 if ((errno != 0) || (*end != 0)) { 811 return false; 812 } 813 if (g_isnan(v) || !g_isfinite(v)) { 814 // Currently we cannot handle these special values. 815 return false; 816 } 817 818 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 819 return true; 820 } 821 return false; 822 } 823 824 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 825 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 826 827 if (flag->is_int()) { 828 int v; 829 if (parse_integer(value, &v)) { 830 result = JVMFlagAccess::set_int(flag, &v, origin); 831 } 832 } else if (flag->is_uint()) { 833 uint v; 834 if (parse_integer(value, &v)) { 835 result = JVMFlagAccess::set_uint(flag, &v, origin); 836 } 837 } else if (flag->is_intx()) { 838 intx v; 839 if (parse_integer(value, &v)) { 840 result = JVMFlagAccess::set_intx(flag, &v, origin); 841 } 842 } else if (flag->is_uintx()) { 843 uintx v; 844 if (parse_integer(value, &v)) { 845 result = JVMFlagAccess::set_uintx(flag, &v, origin); 846 } 847 } else if (flag->is_uint64_t()) { 848 uint64_t v; 849 if (parse_integer(value, &v)) { 850 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 851 } 852 } else if (flag->is_size_t()) { 853 size_t v; 854 if (parse_integer(value, &v)) { 855 result = JVMFlagAccess::set_size_t(flag, &v, origin); 856 } 857 } 858 859 return result == JVMFlag::SUCCESS; 860 } 861 862 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 863 if (value[0] == '\0') { 864 value = nullptr; 865 } 866 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 867 // Contract: JVMFlag always returns a pointer that needs freeing. 868 FREE_C_HEAP_ARRAY(char, value); 869 return true; 870 } 871 872 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 873 const char* old_value = ""; 874 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 875 size_t old_len = old_value != nullptr ? strlen(old_value) : 0; 876 size_t new_len = strlen(new_value); 877 const char* value; 878 char* free_this_too = nullptr; 879 if (old_len == 0) { 880 value = new_value; 881 } else if (new_len == 0) { 882 value = old_value; 883 } else { 884 size_t length = old_len + 1 + new_len + 1; 885 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 886 // each new setting adds another LINE to the switch: 887 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 888 value = buf; 889 free_this_too = buf; 890 } 891 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 892 // JVMFlag always returns a pointer that needs freeing. 893 FREE_C_HEAP_ARRAY(char, value); 894 // JVMFlag made its own copy, so I must delete my own temp. buffer. 895 FREE_C_HEAP_ARRAY(char, free_this_too); 896 return true; 897 } 898 899 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 900 const char* real_name = real_flag_name(arg); 901 JDK_Version since = JDK_Version(); 902 switch (is_deprecated_flag(arg, &since)) { 903 case -1: { 904 // Obsolete or expired, so don't process normally, 905 // but allow for an obsolete flag we're still 906 // temporarily allowing. 907 if (!is_obsolete_flag(arg, &since)) { 908 return real_name; 909 } 910 // Note if we're not considered obsolete then we can't be expired either 911 // as obsoletion must come first. 912 return nullptr; 913 } 914 case 0: 915 return real_name; 916 case 1: { 917 char version[256]; 918 since.to_string(version, sizeof(version)); 919 if (real_name != arg) { 920 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 921 arg, version, real_name); 922 } else { 923 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 924 arg, version); 925 } 926 return real_name; 927 } 928 } 929 ShouldNotReachHere(); 930 return nullptr; 931 } 932 933 #define BUFLEN 255 934 935 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 936 char name_copied[BUFLEN+1]; 937 if (name[name_length] != 0) { 938 if (name_length > BUFLEN) { 939 return nullptr; 940 } else { 941 strncpy(name_copied, name, name_length); 942 name_copied[name_length] = '\0'; 943 name = name_copied; 944 } 945 } 946 947 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 948 if (real_name == nullptr) { 949 return nullptr; 950 } 951 JVMFlag* flag = JVMFlag::find_flag(real_name); 952 return flag; 953 } 954 955 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 956 bool is_bool = false; 957 bool bool_val = false; 958 char c = *arg; 959 if (c == '+' || c == '-') { 960 is_bool = true; 961 bool_val = (c == '+'); 962 arg++; 963 } 964 965 const char* name = arg; 966 while (true) { 967 c = *arg; 968 if (isalnum(c) || (c == '_')) { 969 ++arg; 970 } else { 971 break; 972 } 973 } 974 975 size_t name_len = size_t(arg - name); 976 if (name_len == 0) { 977 return false; 978 } 979 980 JVMFlag* flag = find_jvm_flag(name, name_len); 981 if (flag == nullptr) { 982 return false; 983 } 984 985 if (is_bool) { 986 if (*arg != 0) { 987 // Error -- extra characters such as -XX:+BoolFlag=123 988 return false; 989 } 990 return set_bool_flag(flag, bool_val, origin); 991 } 992 993 if (arg[0] == '=') { 994 const char* value = arg + 1; 995 if (flag->is_ccstr()) { 996 if (flag->ccstr_accumulates()) { 997 return append_to_string_flag(flag, value, origin); 998 } else { 999 return set_string_flag(flag, value, origin); 1000 } 1001 } else if (flag->is_double()) { 1002 return set_fp_numeric_flag(flag, value, origin); 1003 } else { 1004 return set_numeric_flag(flag, value, origin); 1005 } 1006 } 1007 1008 if (arg[0] == ':' && arg[1] == '=') { 1009 // -XX:Foo:=xxx will reset the string flag to the given value. 1010 const char* value = arg + 2; 1011 return set_string_flag(flag, value, origin); 1012 } 1013 1014 return false; 1015 } 1016 1017 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1018 assert(bldarray != nullptr, "illegal argument"); 1019 1020 if (arg == nullptr) { 1021 return; 1022 } 1023 1024 int new_count = *count + 1; 1025 1026 // expand the array and add arg to the last element 1027 if (*bldarray == nullptr) { 1028 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1029 } else { 1030 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1031 } 1032 (*bldarray)[*count] = os::strdup_check_oom(arg); 1033 *count = new_count; 1034 } 1035 1036 void Arguments::build_jvm_args(const char* arg) { 1037 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1038 } 1039 1040 void Arguments::build_jvm_flags(const char* arg) { 1041 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1042 } 1043 1044 // utility function to return a string that concatenates all 1045 // strings in a given char** array 1046 const char* Arguments::build_resource_string(char** args, int count) { 1047 if (args == nullptr || count == 0) { 1048 return nullptr; 1049 } 1050 size_t length = 0; 1051 for (int i = 0; i < count; i++) { 1052 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character 1053 } 1054 char* s = NEW_RESOURCE_ARRAY(char, length); 1055 char* dst = s; 1056 for (int j = 0; j < count; j++) { 1057 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character 1058 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character 1059 dst += offset; 1060 length -= offset; 1061 } 1062 return (const char*) s; 1063 } 1064 1065 void Arguments::print_on(outputStream* st) { 1066 st->print_cr("VM Arguments:"); 1067 if (num_jvm_flags() > 0) { 1068 st->print("jvm_flags: "); print_jvm_flags_on(st); 1069 st->cr(); 1070 } 1071 if (num_jvm_args() > 0) { 1072 st->print("jvm_args: "); print_jvm_args_on(st); 1073 st->cr(); 1074 } 1075 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1076 if (_java_class_path != nullptr) { 1077 char* path = _java_class_path->value(); 1078 size_t len = strlen(path); 1079 st->print("java_class_path (initial): "); 1080 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1081 if (len == 0) { 1082 st->print_raw_cr("<not set>"); 1083 } else { 1084 st->print_raw_cr(path, len); 1085 } 1086 } 1087 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1088 } 1089 1090 void Arguments::print_summary_on(outputStream* st) { 1091 // Print the command line. Environment variables that are helpful for 1092 // reproducing the problem are written later in the hs_err file. 1093 // flags are from setting file 1094 if (num_jvm_flags() > 0) { 1095 st->print_raw("Settings File: "); 1096 print_jvm_flags_on(st); 1097 st->cr(); 1098 } 1099 // args are the command line and environment variable arguments. 1100 st->print_raw("Command Line: "); 1101 if (num_jvm_args() > 0) { 1102 print_jvm_args_on(st); 1103 } 1104 // this is the classfile and any arguments to the java program 1105 if (java_command() != nullptr) { 1106 st->print("%s", java_command()); 1107 } 1108 st->cr(); 1109 } 1110 1111 void Arguments::print_jvm_flags_on(outputStream* st) { 1112 if (_num_jvm_flags > 0) { 1113 for (int i=0; i < _num_jvm_flags; i++) { 1114 st->print("%s ", _jvm_flags_array[i]); 1115 } 1116 } 1117 } 1118 1119 void Arguments::print_jvm_args_on(outputStream* st) { 1120 if (_num_jvm_args > 0) { 1121 for (int i=0; i < _num_jvm_args; i++) { 1122 st->print("%s ", _jvm_args_array[i]); 1123 } 1124 } 1125 } 1126 1127 bool Arguments::process_argument(const char* arg, 1128 jboolean ignore_unrecognized, 1129 JVMFlagOrigin origin) { 1130 JDK_Version since = JDK_Version(); 1131 1132 if (parse_argument(arg, origin)) { 1133 return true; 1134 } 1135 1136 // Determine if the flag has '+', '-', or '=' characters. 1137 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1138 const char* const argname = has_plus_minus ? arg + 1 : arg; 1139 1140 size_t arg_len; 1141 const char* equal_sign = strchr(argname, '='); 1142 if (equal_sign == nullptr) { 1143 arg_len = strlen(argname); 1144 } else { 1145 arg_len = equal_sign - argname; 1146 } 1147 1148 // Only make the obsolete check for valid arguments. 1149 if (arg_len <= BUFLEN) { 1150 // Construct a string which consists only of the argument name without '+', '-', or '='. 1151 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1152 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1153 if (is_obsolete_flag(stripped_argname, &since)) { 1154 char version[256]; 1155 since.to_string(version, sizeof(version)); 1156 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1157 return true; 1158 } 1159 } 1160 1161 // For locked flags, report a custom error message if available. 1162 // Otherwise, report the standard unrecognized VM option. 1163 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1164 if (found_flag != nullptr) { 1165 char locked_message_buf[BUFLEN]; 1166 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1167 if (strlen(locked_message_buf) != 0) { 1168 #ifdef PRODUCT 1169 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD; 1170 if (ignore_unrecognized && mismatched) { 1171 return true; 1172 } 1173 #endif 1174 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1175 } 1176 if (found_flag->is_bool() && !has_plus_minus) { 1177 jio_fprintf(defaultStream::error_stream(), 1178 "Missing +/- setting for VM option '%s'\n", argname); 1179 } else if (!found_flag->is_bool() && has_plus_minus) { 1180 jio_fprintf(defaultStream::error_stream(), 1181 "Unexpected +/- setting in VM option '%s'\n", argname); 1182 } else { 1183 jio_fprintf(defaultStream::error_stream(), 1184 "Improperly specified VM option '%s'\n", argname); 1185 } 1186 } else { 1187 if (ignore_unrecognized) { 1188 return true; 1189 } 1190 jio_fprintf(defaultStream::error_stream(), 1191 "Unrecognized VM option '%s'\n", argname); 1192 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1193 if (fuzzy_matched != nullptr) { 1194 jio_fprintf(defaultStream::error_stream(), 1195 "Did you mean '%s%s%s'?\n", 1196 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1197 fuzzy_matched->name(), 1198 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1199 } 1200 } 1201 1202 // allow for commandline "commenting out" options like -XX:#+Verbose 1203 return arg[0] == '#'; 1204 } 1205 1206 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1207 FILE* stream = os::fopen(file_name, "rb"); 1208 if (stream == nullptr) { 1209 if (should_exist) { 1210 jio_fprintf(defaultStream::error_stream(), 1211 "Could not open settings file %s\n", file_name); 1212 return false; 1213 } else { 1214 return true; 1215 } 1216 } 1217 1218 char token[1024]; 1219 int pos = 0; 1220 1221 bool in_white_space = true; 1222 bool in_comment = false; 1223 bool in_quote = false; 1224 int quote_c = 0; 1225 bool result = true; 1226 1227 int c = getc(stream); 1228 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1229 if (in_white_space) { 1230 if (in_comment) { 1231 if (c == '\n') in_comment = false; 1232 } else { 1233 if (c == '#') in_comment = true; 1234 else if (!isspace((unsigned char) c)) { 1235 in_white_space = false; 1236 token[pos++] = checked_cast<char>(c); 1237 } 1238 } 1239 } else { 1240 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) { 1241 // token ends at newline, or at unquoted whitespace 1242 // this allows a way to include spaces in string-valued options 1243 token[pos] = '\0'; 1244 logOption(token); 1245 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1246 build_jvm_flags(token); 1247 pos = 0; 1248 in_white_space = true; 1249 in_quote = false; 1250 } else if (!in_quote && (c == '\'' || c == '"')) { 1251 in_quote = true; 1252 quote_c = c; 1253 } else if (in_quote && (c == quote_c)) { 1254 in_quote = false; 1255 } else { 1256 token[pos++] = checked_cast<char>(c); 1257 } 1258 } 1259 c = getc(stream); 1260 } 1261 if (pos > 0) { 1262 token[pos] = '\0'; 1263 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1264 build_jvm_flags(token); 1265 } 1266 fclose(stream); 1267 return result; 1268 } 1269 1270 //============================================================================================================= 1271 // Parsing of properties (-D) 1272 1273 const char* Arguments::get_property(const char* key) { 1274 return PropertyList_get_value(system_properties(), key); 1275 } 1276 1277 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1278 const char* eq = strchr(prop, '='); 1279 const char* key; 1280 const char* value = ""; 1281 1282 if (eq == nullptr) { 1283 // property doesn't have a value, thus use passed string 1284 key = prop; 1285 } else { 1286 // property have a value, thus extract it and save to the 1287 // allocated string 1288 size_t key_len = eq - prop; 1289 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1290 1291 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1292 key = tmp_key; 1293 1294 value = &prop[key_len + 1]; 1295 } 1296 1297 if (internal == ExternalProperty) { 1298 CDSConfig::check_incompatible_property(key, value); 1299 } 1300 1301 if (strcmp(key, "java.compiler") == 0) { 1302 // we no longer support java.compiler system property, log a warning and let it get 1303 // passed to Java, like any other system property 1304 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) { 1305 // for applications using NONE or empty value, log a more informative message 1306 warning("The java.compiler system property is obsolete and no longer supported, use -Xint"); 1307 } else { 1308 warning("The java.compiler system property is obsolete and no longer supported."); 1309 } 1310 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1311 // append is true, writable is true, internal is false 1312 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1313 WriteableProperty, ExternalProperty); 1314 } else { 1315 if (strcmp(key, "sun.java.command") == 0) { 1316 char *old_java_command = _java_command; 1317 _java_command = os::strdup_check_oom(value, mtArguments); 1318 if (old_java_command != nullptr) { 1319 os::free(old_java_command); 1320 } 1321 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1322 // If this property is set on the command line then its value will be 1323 // displayed in VM error logs as the URL at which to submit such logs. 1324 // Normally the URL displayed in error logs is different from the value 1325 // of this system property, so a different property should have been 1326 // used here, but we leave this as-is in case someone depends upon it. 1327 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1328 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1329 // its value without going through the property list or making a Java call. 1330 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1331 if (old_java_vendor_url_bug != nullptr) { 1332 os::free((void *)old_java_vendor_url_bug); 1333 } 1334 } 1335 1336 // Create new property and add at the end of the list 1337 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1338 } 1339 1340 if (key != prop) { 1341 // SystemProperty copy passed value, thus free previously allocated 1342 // memory 1343 FreeHeap((void *)key); 1344 } 1345 1346 return true; 1347 } 1348 1349 //=========================================================================================================== 1350 // Setting int/mixed/comp mode flags 1351 1352 void Arguments::set_mode_flags(Mode mode) { 1353 // Set up default values for all flags. 1354 // If you add a flag to any of the branches below, 1355 // add a default value for it here. 1356 _mode = mode; 1357 1358 // Ensure Agent_OnLoad has the correct initial values. 1359 // This may not be the final mode; mode may change later in onload phase. 1360 PropertyList_unique_add(&_system_properties, "java.vm.info", 1361 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1362 1363 UseInterpreter = true; 1364 UseCompiler = true; 1365 UseLoopCounter = true; 1366 1367 // Default values may be platform/compiler dependent - 1368 // use the saved values 1369 ClipInlining = Arguments::_ClipInlining; 1370 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1371 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1372 BackgroundCompilation = Arguments::_BackgroundCompilation; 1373 1374 // Change from defaults based on mode 1375 switch (mode) { 1376 default: 1377 ShouldNotReachHere(); 1378 break; 1379 case _int: 1380 UseCompiler = false; 1381 UseLoopCounter = false; 1382 AlwaysCompileLoopMethods = false; 1383 UseOnStackReplacement = false; 1384 break; 1385 case _mixed: 1386 // same as default 1387 break; 1388 case _comp: 1389 UseInterpreter = false; 1390 BackgroundCompilation = false; 1391 ClipInlining = false; 1392 break; 1393 } 1394 } 1395 1396 // Conflict: required to use shared spaces (-Xshare:on), but 1397 // incompatible command line options were chosen. 1398 void Arguments::no_shared_spaces(const char* message) { 1399 if (RequireSharedSpaces) { 1400 aot_log_error(aot)("%s is incompatible with other specified options.", 1401 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS"); 1402 if (CDSConfig::new_aot_flags_used()) { 1403 vm_exit_during_initialization("Unable to use AOT cache", message); 1404 } else { 1405 vm_exit_during_initialization("Unable to use shared archive", message); 1406 } 1407 } else { 1408 if (CDSConfig::new_aot_flags_used()) { 1409 log_warning(aot)("Unable to use AOT cache: %s", message); 1410 } else { 1411 aot_log_info(aot)("Unable to use shared archive: %s", message); 1412 } 1413 UseSharedSpaces = false; 1414 } 1415 } 1416 1417 static void set_object_alignment() { 1418 // Object alignment. 1419 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1420 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1421 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1422 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1423 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1424 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1425 1426 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1427 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1428 1429 // Oop encoding heap max 1430 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1431 } 1432 1433 size_t Arguments::max_heap_for_compressed_oops() { 1434 // Avoid sign flip. 1435 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1436 // We need to fit both the null page and the heap into the memory budget, while 1437 // keeping alignment constraints of the heap. To guarantee the latter, as the 1438 // null page is located before the heap, we pad the null page to the conservative 1439 // maximum alignment that the GC may ever impose upon the heap. 1440 size_t displacement_due_to_null_page = align_up(os::vm_page_size(), 1441 _conservative_max_heap_alignment); 1442 1443 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1444 NOT_LP64(ShouldNotReachHere(); return 0); 1445 } 1446 1447 void Arguments::set_use_compressed_oops() { 1448 #ifdef _LP64 1449 // MaxHeapSize is not set up properly at this point, but 1450 // the only value that can override MaxHeapSize if we are 1451 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1452 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1453 1454 if (max_heap_size <= max_heap_for_compressed_oops()) { 1455 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1456 FLAG_SET_ERGO(UseCompressedOops, true); 1457 } 1458 } else { 1459 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1460 warning("Max heap size too large for Compressed Oops"); 1461 FLAG_SET_DEFAULT(UseCompressedOops, false); 1462 } 1463 } 1464 #endif // _LP64 1465 } 1466 1467 void Arguments::set_conservative_max_heap_alignment() { 1468 // The conservative maximum required alignment for the heap is the maximum of 1469 // the alignments imposed by several sources: any requirements from the heap 1470 // itself and the maximum page size we may run the VM with. 1471 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1472 _conservative_max_heap_alignment = MAX4(heap_alignment, 1473 os::vm_allocation_granularity(), 1474 os::max_page_size(), 1475 GCArguments::compute_heap_alignment()); 1476 } 1477 1478 jint Arguments::set_ergonomics_flags() { 1479 GCConfig::initialize(); 1480 1481 set_conservative_max_heap_alignment(); 1482 1483 #ifdef _LP64 1484 set_use_compressed_oops(); 1485 1486 // Also checks that certain machines are slower with compressed oops 1487 // in vm_version initialization code. 1488 #endif // _LP64 1489 1490 return JNI_OK; 1491 } 1492 1493 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1494 // The AggressiveHeap check is a temporary workaround to avoid calling 1495 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1496 // selected. This works because AggressiveHeap implies UseParallelGC 1497 // where we know the ratio will be 1. Once the AggressiveHeap option is 1498 // removed, this can be cleaned up. 1499 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1500 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1501 size_t max_allocatable = os::commit_memory_limit(); 1502 1503 return MIN2(limit, max_allocatable / fraction); 1504 } 1505 1506 // Use static initialization to get the default before parsing 1507 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1508 1509 void Arguments::set_heap_size() { 1510 julong phys_mem; 1511 1512 // If the user specified one of these options, they 1513 // want specific memory sizing so do not limit memory 1514 // based on compressed oops addressability. 1515 // Also, memory limits will be calculated based on 1516 // available os physical memory, not our MaxRAM limit, 1517 // unless MaxRAM is also specified. 1518 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1519 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1520 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1521 !FLAG_IS_DEFAULT(MaxRAM)); 1522 if (override_coop_limit) { 1523 if (FLAG_IS_DEFAULT(MaxRAM)) { 1524 phys_mem = static_cast<julong>(os::physical_memory()); 1525 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1526 } else { 1527 phys_mem = (julong)MaxRAM; 1528 } 1529 } else { 1530 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(static_cast<julong>(os::physical_memory()), (julong)MaxRAM) 1531 : (julong)MaxRAM; 1532 } 1533 1534 // If the maximum heap size has not been set with -Xmx, 1535 // then set it as fraction of the size of physical memory, 1536 // respecting the maximum and minimum sizes of the heap. 1537 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1538 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100); 1539 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100); 1540 if (reasonable_min < MaxHeapSize) { 1541 // Small physical memory, so use a minimum fraction of it for the heap 1542 reasonable_max = reasonable_min; 1543 } else { 1544 // Not-small physical memory, so require a heap at least 1545 // as large as MaxHeapSize 1546 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1547 } 1548 1549 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1550 // Limit the heap size to ErgoHeapSizeLimit 1551 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1552 } 1553 1554 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1555 1556 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1557 // An initial heap size was specified on the command line, 1558 // so be sure that the maximum size is consistent. Done 1559 // after call to limit_heap_by_allocatable_memory because that 1560 // method might reduce the allocation size. 1561 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1562 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1563 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1564 } 1565 1566 #ifdef _LP64 1567 if (UseCompressedOops || UseCompressedClassPointers) { 1568 // HeapBaseMinAddress can be greater than default but not less than. 1569 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1570 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1571 // matches compressed oops printing flags 1572 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu" 1573 " (%zuG) which is greater than value given %zu", 1574 DefaultHeapBaseMinAddress, 1575 DefaultHeapBaseMinAddress/G, 1576 HeapBaseMinAddress); 1577 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1578 } 1579 } 1580 } 1581 if (UseCompressedOops) { 1582 // Limit the heap size to the maximum possible when using compressed oops 1583 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1584 1585 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1586 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1587 // but it should be not less than default MaxHeapSize. 1588 max_coop_heap -= HeapBaseMinAddress; 1589 } 1590 1591 // If user specified flags prioritizing os physical 1592 // memory limits, then disable compressed oops if 1593 // limits exceed max_coop_heap and UseCompressedOops 1594 // was not specified. 1595 if (reasonable_max > max_coop_heap) { 1596 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1597 aot_log_info(aot)("UseCompressedOops disabled due to" 1598 " max heap %zu > compressed oop heap %zu. " 1599 "Please check the setting of MaxRAMPercentage %5.2f." 1600 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1601 FLAG_SET_ERGO(UseCompressedOops, false); 1602 } else { 1603 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1604 } 1605 } 1606 } 1607 #endif // _LP64 1608 1609 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max); 1610 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1611 } 1612 1613 // If the minimum or initial heap_size have not been set or requested to be set 1614 // ergonomically, set them accordingly. 1615 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1616 julong reasonable_minimum = (julong)(OldSize + NewSize); 1617 1618 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1619 1620 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1621 1622 if (InitialHeapSize == 0) { 1623 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100); 1624 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1625 1626 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1627 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1628 1629 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1630 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize); 1631 } 1632 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1633 // synchronize with InitialHeapSize to avoid errors with the default value. 1634 if (MinHeapSize == 0) { 1635 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1636 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize); 1637 } 1638 } 1639 } 1640 1641 // This option inspects the machine and attempts to set various 1642 // parameters to be optimal for long-running, memory allocation 1643 // intensive jobs. It is intended for machines with large 1644 // amounts of cpu and memory. 1645 jint Arguments::set_aggressive_heap_flags() { 1646 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1647 // VM, but we may not be able to represent the total physical memory 1648 // available (like having 8gb of memory on a box but using a 32bit VM). 1649 // Thus, we need to make sure we're using a julong for intermediate 1650 // calculations. 1651 julong initHeapSize; 1652 size_t phys_mem = os::physical_memory(); 1653 julong total_memory = static_cast<julong>(phys_mem); 1654 1655 if (total_memory < (julong) 256 * M) { 1656 jio_fprintf(defaultStream::error_stream(), 1657 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1658 vm_exit(1); 1659 } 1660 1661 // The heap size is half of available memory, or (at most) 1662 // all of possible memory less 160mb (leaving room for the OS 1663 // when using ISM). This is the maximum; because adaptive sizing 1664 // is turned on below, the actual space used may be smaller. 1665 1666 initHeapSize = MIN2(total_memory / (julong) 2, 1667 total_memory - (julong) 160 * M); 1668 1669 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1670 1671 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1672 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1673 return JNI_EINVAL; 1674 } 1675 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1676 return JNI_EINVAL; 1677 } 1678 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1679 return JNI_EINVAL; 1680 } 1681 } 1682 if (FLAG_IS_DEFAULT(NewSize)) { 1683 // Make the young generation 3/8ths of the total heap. 1684 if (FLAG_SET_CMDLINE(NewSize, 1685 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1686 return JNI_EINVAL; 1687 } 1688 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1689 return JNI_EINVAL; 1690 } 1691 } 1692 1693 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1694 FLAG_SET_DEFAULT(UseLargePages, true); 1695 #endif 1696 1697 // Increase some data structure sizes for efficiency 1698 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1699 return JNI_EINVAL; 1700 } 1701 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1702 return JNI_EINVAL; 1703 } 1704 1705 // See the OldPLABSize comment below, but replace 'after promotion' 1706 // with 'after copying'. YoungPLABSize is the size of the survivor 1707 // space per-gc-thread buffers. The default is 4kw. 1708 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1709 return JNI_EINVAL; 1710 } 1711 1712 // OldPLABSize is the size of the buffers in the old gen that 1713 // UseParallelGC uses to promote live data that doesn't fit in the 1714 // survivor spaces. At any given time, there's one for each gc thread. 1715 // The default size is 1kw. These buffers are rarely used, since the 1716 // survivor spaces are usually big enough. For specjbb, however, there 1717 // are occasions when there's lots of live data in the young gen 1718 // and we end up promoting some of it. We don't have a definite 1719 // explanation for why bumping OldPLABSize helps, but the theory 1720 // is that a bigger PLAB results in retaining something like the 1721 // original allocation order after promotion, which improves mutator 1722 // locality. A minor effect may be that larger PLABs reduce the 1723 // number of PLAB allocation events during gc. The value of 8kw 1724 // was arrived at by experimenting with specjbb. 1725 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1726 return JNI_EINVAL; 1727 } 1728 1729 // Enable parallel GC and adaptive generation sizing 1730 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1731 return JNI_EINVAL; 1732 } 1733 1734 // Encourage steady state memory management 1735 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1736 return JNI_EINVAL; 1737 } 1738 1739 return JNI_OK; 1740 } 1741 1742 // This must be called after ergonomics. 1743 void Arguments::set_bytecode_flags() { 1744 if (!RewriteBytecodes) { 1745 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1746 } 1747 } 1748 1749 // Aggressive optimization flags 1750 jint Arguments::set_aggressive_opts_flags() { 1751 #ifdef COMPILER2 1752 if (AggressiveUnboxing) { 1753 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1754 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1755 } else if (!EliminateAutoBox) { 1756 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1757 AggressiveUnboxing = false; 1758 } 1759 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1760 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1761 } else if (!DoEscapeAnalysis) { 1762 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1763 AggressiveUnboxing = false; 1764 } 1765 } 1766 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1767 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1768 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1769 } 1770 // Feed the cache size setting into the JDK 1771 char buffer[1024]; 1772 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax); 1773 if (!add_property(buffer)) { 1774 return JNI_ENOMEM; 1775 } 1776 } 1777 #endif 1778 1779 return JNI_OK; 1780 } 1781 1782 //=========================================================================================================== 1783 1784 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1785 if (_sun_java_launcher != _default_java_launcher) { 1786 os::free(const_cast<char*>(_sun_java_launcher)); 1787 } 1788 _sun_java_launcher = os::strdup_check_oom(launcher); 1789 } 1790 1791 bool Arguments::created_by_java_launcher() { 1792 assert(_sun_java_launcher != nullptr, "property must have value"); 1793 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1794 } 1795 1796 bool Arguments::executing_unit_tests() { 1797 return _executing_unit_tests; 1798 } 1799 1800 //=========================================================================================================== 1801 // Parsing of main arguments 1802 1803 static unsigned int addreads_count = 0; 1804 static unsigned int addexports_count = 0; 1805 static unsigned int addopens_count = 0; 1806 static unsigned int patch_mod_count = 0; 1807 static unsigned int enable_native_access_count = 0; 1808 static bool patch_mod_javabase = false; 1809 1810 // Check the consistency of vm_init_args 1811 bool Arguments::check_vm_args_consistency() { 1812 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency() 1813 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) { 1814 return false; 1815 } 1816 1817 // Method for adding checks for flag consistency. 1818 // The intent is to warn the user of all possible conflicts, 1819 // before returning an error. 1820 // Note: Needs platform-dependent factoring. 1821 bool status = true; 1822 1823 if (TLABRefillWasteFraction == 0) { 1824 jio_fprintf(defaultStream::error_stream(), 1825 "TLABRefillWasteFraction should be a denominator, " 1826 "not %zu\n", 1827 TLABRefillWasteFraction); 1828 status = false; 1829 } 1830 1831 status = CompilerConfig::check_args_consistency(status); 1832 #if INCLUDE_JVMCI 1833 if (status && EnableJVMCI) { 1834 // Add the JVMCI module if not using libjvmci or EnableJVMCI 1835 // was explicitly set on the command line or in the jimage. 1836 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) { 1837 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) { 1838 return false; 1839 } 1840 } 1841 } 1842 #endif 1843 1844 #if INCLUDE_JFR 1845 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1846 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) { 1847 return false; 1848 } 1849 } 1850 #endif 1851 1852 #ifndef SUPPORT_RESERVED_STACK_AREA 1853 if (StackReservedPages != 0) { 1854 FLAG_SET_CMDLINE(StackReservedPages, 0); 1855 warning("Reserved Stack Area not supported on this platform"); 1856 } 1857 #endif 1858 1859 return status; 1860 } 1861 1862 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1863 const char* option_type) { 1864 if (ignore) return false; 1865 1866 const char* spacer = " "; 1867 if (option_type == nullptr) { 1868 option_type = ++spacer; // Set both to the empty string. 1869 } 1870 1871 jio_fprintf(defaultStream::error_stream(), 1872 "Unrecognized %s%soption: %s\n", option_type, spacer, 1873 option->optionString); 1874 return true; 1875 } 1876 1877 static const char* user_assertion_options[] = { 1878 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr 1879 }; 1880 1881 static const char* system_assertion_options[] = { 1882 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr 1883 }; 1884 1885 bool Arguments::parse_uint(const char* value, 1886 uint* uint_arg, 1887 uint min_size) { 1888 uint n; 1889 if (!parse_integer(value, &n)) { 1890 return false; 1891 } 1892 if (n >= min_size) { 1893 *uint_arg = n; 1894 return true; 1895 } else { 1896 return false; 1897 } 1898 } 1899 1900 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 1901 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 1902 CDSConfig::check_internal_module_property(prop_name, prop_value); 1903 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 1904 char* property = AllocateHeap(prop_len, mtArguments); 1905 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 1906 if (ret < 0 || ret >= (int)prop_len) { 1907 FreeHeap(property); 1908 return false; 1909 } 1910 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 1911 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 1912 // that multiple occurrences of the associated flag just causes the existing property value to be 1913 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 1914 // to a property after we have finished flag processing. 1915 bool added = add_property(property, WriteableProperty, internal); 1916 FreeHeap(property); 1917 return added; 1918 } 1919 1920 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 1921 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 1922 CDSConfig::check_internal_module_property(prop_base_name, prop_value); 1923 const unsigned int props_count_limit = 1000; 1924 const int max_digits = 3; 1925 const int extra_symbols_count = 3; // includes '.', '=', '\0' 1926 1927 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 1928 if (count < props_count_limit) { 1929 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 1930 char* property = AllocateHeap(prop_len, mtArguments); 1931 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 1932 if (ret < 0 || ret >= (int)prop_len) { 1933 FreeHeap(property); 1934 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 1935 return false; 1936 } 1937 bool added = add_property(property, UnwriteableProperty, InternalProperty); 1938 FreeHeap(property); 1939 return added; 1940 } 1941 1942 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 1943 return false; 1944 } 1945 1946 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1947 julong* long_arg, 1948 julong min_size, 1949 julong max_size) { 1950 if (!parse_integer(s, long_arg)) return arg_unreadable; 1951 return check_memory_size(*long_arg, min_size, max_size); 1952 } 1953 1954 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) { 1955 // Save default settings for some mode flags 1956 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1957 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1958 Arguments::_ClipInlining = ClipInlining; 1959 Arguments::_BackgroundCompilation = BackgroundCompilation; 1960 1961 // Remember the default value of SharedBaseAddress. 1962 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 1963 1964 // Setup flags for mixed which is the default 1965 set_mode_flags(_mixed); 1966 1967 jint result; 1968 for (int i = 0; i < all_args->length(); i++) { 1969 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin); 1970 if (result != JNI_OK) { 1971 return result; 1972 } 1973 } 1974 1975 // Disable CDS for exploded image 1976 if (!has_jimage()) { 1977 no_shared_spaces("CDS disabled on exploded JDK"); 1978 } 1979 1980 // We need to ensure processor and memory resources have been properly 1981 // configured - which may rely on arguments we just processed - before 1982 // doing the final argument processing. Any argument processing that 1983 // needs to know about processor and memory resources must occur after 1984 // this point. 1985 1986 os::init_container_support(); 1987 1988 SystemMemoryBarrier::initialize(); 1989 1990 // Do final processing now that all arguments have been parsed 1991 result = finalize_vm_init_args(); 1992 if (result != JNI_OK) { 1993 return result; 1994 } 1995 1996 return JNI_OK; 1997 } 1998 1999 #if !INCLUDE_JVMTI || INCLUDE_CDS 2000 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2001 // represents a valid JDWP agent. is_path==true denotes that we 2002 // are dealing with -agentpath (case where name is a path), otherwise with 2003 // -agentlib 2004 static bool valid_jdwp_agent(char *name, bool is_path) { 2005 char *_name; 2006 const char *_jdwp = "jdwp"; 2007 size_t _len_jdwp, _len_prefix; 2008 2009 if (is_path) { 2010 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) { 2011 return false; 2012 } 2013 2014 _name++; // skip past last path separator 2015 _len_prefix = strlen(JNI_LIB_PREFIX); 2016 2017 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2018 return false; 2019 } 2020 2021 _name += _len_prefix; 2022 _len_jdwp = strlen(_jdwp); 2023 2024 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2025 _name += _len_jdwp; 2026 } 2027 else { 2028 return false; 2029 } 2030 2031 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2032 return false; 2033 } 2034 2035 return true; 2036 } 2037 2038 if (strcmp(name, _jdwp) == 0) { 2039 return true; 2040 } 2041 2042 return false; 2043 } 2044 #endif 2045 2046 int Arguments::process_patch_mod_option(const char* patch_mod_tail) { 2047 // --patch-module=<module>=<file>(<pathsep><file>)* 2048 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value"); 2049 // Find the equal sign between the module name and the path specification 2050 const char* module_equal = strchr(patch_mod_tail, '='); 2051 if (module_equal == nullptr) { 2052 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2053 return JNI_ERR; 2054 } else { 2055 // Pick out the module name 2056 size_t module_len = module_equal - patch_mod_tail; 2057 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2058 if (module_name != nullptr) { 2059 memcpy(module_name, patch_mod_tail, module_len); 2060 *(module_name + module_len) = '\0'; 2061 // The path piece begins one past the module_equal sign 2062 add_patch_mod_prefix(module_name, module_equal + 1); 2063 FREE_C_HEAP_ARRAY(char, module_name); 2064 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2065 return JNI_ENOMEM; 2066 } 2067 } else { 2068 return JNI_ENOMEM; 2069 } 2070 } 2071 return JNI_OK; 2072 } 2073 2074 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2075 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2076 // The min and max sizes match the values in globals.hpp, but scaled 2077 // with K. The values have been chosen so that alignment with page 2078 // size doesn't change the max value, which makes the conversions 2079 // back and forth between Xss value and ThreadStackSize value easier. 2080 // The values have also been chosen to fit inside a 32-bit signed type. 2081 const julong min_ThreadStackSize = 0; 2082 const julong max_ThreadStackSize = 1 * M; 2083 2084 // Make sure the above values match the range set in globals.hpp 2085 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2086 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2087 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2088 2089 const julong min_size = min_ThreadStackSize * K; 2090 const julong max_size = max_ThreadStackSize * K; 2091 2092 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2093 2094 julong size = 0; 2095 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2096 if (errcode != arg_in_range) { 2097 bool silent = (option == nullptr); // Allow testing to silence error messages 2098 if (!silent) { 2099 jio_fprintf(defaultStream::error_stream(), 2100 "Invalid thread stack size: %s\n", option->optionString); 2101 describe_range_error(errcode); 2102 } 2103 return JNI_EINVAL; 2104 } 2105 2106 // Internally track ThreadStackSize in units of 1024 bytes. 2107 const julong size_aligned = align_up(size, K); 2108 assert(size <= size_aligned, 2109 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2110 size, size_aligned); 2111 2112 const julong size_in_K = size_aligned / K; 2113 assert(size_in_K < (julong)max_intx, 2114 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2115 size_in_K); 2116 2117 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2118 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2119 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2120 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2121 max_expanded, size_in_K); 2122 2123 *out_ThreadStackSize = (intx)size_in_K; 2124 2125 return JNI_OK; 2126 } 2127 2128 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) { 2129 // For match_option to return remaining or value part of option string 2130 const char* tail; 2131 2132 // iterate over arguments 2133 for (int index = 0; index < args->nOptions; index++) { 2134 bool is_absolute_path = false; // for -agentpath vs -agentlib 2135 2136 const JavaVMOption* option = args->options + index; 2137 2138 if (!match_option(option, "-Djava.class.path", &tail) && 2139 !match_option(option, "-Dsun.java.command", &tail) && 2140 !match_option(option, "-Dsun.java.launcher", &tail)) { 2141 2142 // add all jvm options to the jvm_args string. This string 2143 // is used later to set the java.vm.args PerfData string constant. 2144 // the -Djava.class.path and the -Dsun.java.command options are 2145 // omitted from jvm_args string as each have their own PerfData 2146 // string constant object. 2147 build_jvm_args(option->optionString); 2148 } 2149 2150 // -verbose:[class/module/gc/jni] 2151 if (match_option(option, "-verbose", &tail)) { 2152 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2153 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2154 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2155 } else if (!strcmp(tail, ":module")) { 2156 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2157 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2158 } else if (!strcmp(tail, ":gc")) { 2159 if (_legacyGCLogging.lastFlag == 0) { 2160 _legacyGCLogging.lastFlag = 1; 2161 } 2162 } else if (!strcmp(tail, ":jni")) { 2163 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2164 } 2165 // -da / -ea / -disableassertions / -enableassertions 2166 // These accept an optional class/package name separated by a colon, e.g., 2167 // -da:java.lang.Thread. 2168 } else if (match_option(option, user_assertion_options, &tail, true)) { 2169 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2170 if (*tail == '\0') { 2171 JavaAssertions::setUserClassDefault(enable); 2172 } else { 2173 assert(*tail == ':', "bogus match by match_option()"); 2174 JavaAssertions::addOption(tail + 1, enable); 2175 } 2176 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2177 } else if (match_option(option, system_assertion_options, &tail, false)) { 2178 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2179 JavaAssertions::setSystemClassDefault(enable); 2180 // -bootclasspath: 2181 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2182 jio_fprintf(defaultStream::output_stream(), 2183 "-Xbootclasspath is no longer a supported option.\n"); 2184 return JNI_EINVAL; 2185 // -bootclasspath/a: 2186 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2187 Arguments::append_sysclasspath(tail); 2188 // -bootclasspath/p: 2189 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2190 jio_fprintf(defaultStream::output_stream(), 2191 "-Xbootclasspath/p is no longer a supported option.\n"); 2192 return JNI_EINVAL; 2193 // -Xrun 2194 } else if (match_option(option, "-Xrun", &tail)) { 2195 if (tail != nullptr) { 2196 const char* pos = strchr(tail, ':'); 2197 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail; 2198 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2199 jio_snprintf(name, len + 1, "%s", tail); 2200 2201 char *options = nullptr; 2202 if(pos != nullptr) { 2203 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2204 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2205 } 2206 #if !INCLUDE_JVMTI 2207 if (strcmp(name, "jdwp") == 0) { 2208 jio_fprintf(defaultStream::error_stream(), 2209 "Debugging agents are not supported in this VM\n"); 2210 return JNI_ERR; 2211 } 2212 #endif // !INCLUDE_JVMTI 2213 JvmtiAgentList::add_xrun(name, options, false); 2214 FREE_C_HEAP_ARRAY(char, name); 2215 FREE_C_HEAP_ARRAY(char, options); 2216 } 2217 } else if (match_option(option, "--add-reads=", &tail)) { 2218 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2219 return JNI_ENOMEM; 2220 } 2221 } else if (match_option(option, "--add-exports=", &tail)) { 2222 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2223 return JNI_ENOMEM; 2224 } 2225 } else if (match_option(option, "--add-opens=", &tail)) { 2226 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2227 return JNI_ENOMEM; 2228 } 2229 } else if (match_option(option, "--add-modules=", &tail)) { 2230 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) { 2231 return JNI_ENOMEM; 2232 } 2233 #if INCLUDE_JVMCI 2234 if (!_jvmci_module_added) { 2235 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci"); 2236 if (jvmci_module != nullptr) { 2237 char before = *(jvmci_module - 1); 2238 char after = *(jvmci_module + strlen("jdk.internal.vm.ci")); 2239 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) { 2240 FLAG_SET_DEFAULT(EnableJVMCI, true); 2241 _jvmci_module_added = true; 2242 } 2243 } 2244 } 2245 #endif 2246 } else if (match_option(option, "--enable-native-access=", &tail)) { 2247 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2248 return JNI_ENOMEM; 2249 } 2250 } else if (match_option(option, "--illegal-native-access=", &tail)) { 2251 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) { 2252 return JNI_ENOMEM; 2253 } 2254 } else if (match_option(option, "--limit-modules=", &tail)) { 2255 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2256 return JNI_ENOMEM; 2257 } 2258 } else if (match_option(option, "--module-path=", &tail)) { 2259 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2260 return JNI_ENOMEM; 2261 } 2262 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2263 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2264 return JNI_ENOMEM; 2265 } 2266 } else if (match_option(option, "--patch-module=", &tail)) { 2267 // --patch-module=<module>=<file>(<pathsep><file>)* 2268 int res = process_patch_mod_option(tail); 2269 if (res != JNI_OK) { 2270 return res; 2271 } 2272 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) { 2273 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) { 2274 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail, 2275 AddProperty, WriteableProperty, InternalProperty); 2276 } else { 2277 jio_fprintf(defaultStream::error_stream(), 2278 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail); 2279 return JNI_ERR; 2280 } 2281 } else if (match_option(option, "--illegal-access=", &tail)) { 2282 char version[256]; 2283 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2284 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2285 // -agentlib and -agentpath 2286 } else if (match_option(option, "-agentlib:", &tail) || 2287 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2288 if(tail != nullptr) { 2289 const char* pos = strchr(tail, '='); 2290 char* name; 2291 if (pos == nullptr) { 2292 name = os::strdup_check_oom(tail, mtArguments); 2293 } else { 2294 size_t len = pos - tail; 2295 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2296 memcpy(name, tail, len); 2297 name[len] = '\0'; 2298 } 2299 2300 char *options = nullptr; 2301 if(pos != nullptr) { 2302 options = os::strdup_check_oom(pos + 1, mtArguments); 2303 } 2304 #if !INCLUDE_JVMTI 2305 if (valid_jdwp_agent(name, is_absolute_path)) { 2306 jio_fprintf(defaultStream::error_stream(), 2307 "Debugging agents are not supported in this VM\n"); 2308 return JNI_ERR; 2309 } 2310 #elif INCLUDE_CDS 2311 if (valid_jdwp_agent(name, is_absolute_path)) { 2312 _has_jdwp_agent = true; 2313 } 2314 #endif // !INCLUDE_JVMTI 2315 JvmtiAgentList::add(name, options, is_absolute_path); 2316 os::free(name); 2317 os::free(options); 2318 } 2319 // -javaagent 2320 } else if (match_option(option, "-javaagent:", &tail)) { 2321 #if !INCLUDE_JVMTI 2322 jio_fprintf(defaultStream::error_stream(), 2323 "Instrumentation agents are not supported in this VM\n"); 2324 return JNI_ERR; 2325 #else 2326 if (tail != nullptr) { 2327 size_t length = strlen(tail) + 1; 2328 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2329 jio_snprintf(options, length, "%s", tail); 2330 JvmtiAgentList::add("instrument", options, false); 2331 FREE_C_HEAP_ARRAY(char, options); 2332 2333 // java agents need module java.instrument 2334 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) { 2335 return JNI_ENOMEM; 2336 } 2337 } 2338 #endif // !INCLUDE_JVMTI 2339 // --enable_preview 2340 } else if (match_option(option, "--enable-preview")) { 2341 set_enable_preview(); 2342 // -Xnoclassgc 2343 } else if (match_option(option, "-Xnoclassgc")) { 2344 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2345 return JNI_EINVAL; 2346 } 2347 // -Xbatch 2348 } else if (match_option(option, "-Xbatch")) { 2349 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2350 return JNI_EINVAL; 2351 } 2352 // -Xmn for compatibility with other JVM vendors 2353 } else if (match_option(option, "-Xmn", &tail)) { 2354 julong long_initial_young_size = 0; 2355 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2356 if (errcode != arg_in_range) { 2357 jio_fprintf(defaultStream::error_stream(), 2358 "Invalid initial young generation size: %s\n", option->optionString); 2359 describe_range_error(errcode); 2360 return JNI_EINVAL; 2361 } 2362 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2363 return JNI_EINVAL; 2364 } 2365 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2366 return JNI_EINVAL; 2367 } 2368 // -Xms 2369 } else if (match_option(option, "-Xms", &tail)) { 2370 julong size = 0; 2371 // an initial heap size of 0 means automatically determine 2372 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2373 if (errcode != arg_in_range) { 2374 jio_fprintf(defaultStream::error_stream(), 2375 "Invalid initial heap size: %s\n", option->optionString); 2376 describe_range_error(errcode); 2377 return JNI_EINVAL; 2378 } 2379 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2380 return JNI_EINVAL; 2381 } 2382 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2383 return JNI_EINVAL; 2384 } 2385 // -Xmx 2386 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2387 julong long_max_heap_size = 0; 2388 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2389 if (errcode != arg_in_range) { 2390 jio_fprintf(defaultStream::error_stream(), 2391 "Invalid maximum heap size: %s\n", option->optionString); 2392 describe_range_error(errcode); 2393 return JNI_EINVAL; 2394 } 2395 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2396 return JNI_EINVAL; 2397 } 2398 // Xmaxf 2399 } else if (match_option(option, "-Xmaxf", &tail)) { 2400 char* err; 2401 double dmaxf = strtod(tail, &err); 2402 if (*err != '\0' || *tail == '\0') { 2403 jio_fprintf(defaultStream::error_stream(), 2404 "Bad max heap free ratio: %s\n", 2405 option->optionString); 2406 return JNI_EINVAL; 2407 } 2408 if (dmaxf < 0.0 || dmaxf > 1.0) { 2409 jio_fprintf(defaultStream::error_stream(), 2410 "-Xmaxf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n", 2411 option->optionString); 2412 return JNI_EINVAL; 2413 } 2414 const uintx umaxf = (uintx)(dmaxf * 100); 2415 if (MinHeapFreeRatio > umaxf) { 2416 jio_fprintf(defaultStream::error_stream(), 2417 "-Xmaxf value (%s) must be greater than or equal to the implicit -Xminf value (%.2f)\n", 2418 tail, MinHeapFreeRatio / 100.0f); 2419 return JNI_EINVAL; 2420 } 2421 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, umaxf) != JVMFlag::SUCCESS) { 2422 return JNI_EINVAL; 2423 } 2424 // Xminf 2425 } else if (match_option(option, "-Xminf", &tail)) { 2426 char* err; 2427 double dminf = strtod(tail, &err); 2428 if (*err != '\0' || *tail == '\0') { 2429 jio_fprintf(defaultStream::error_stream(), 2430 "Bad min heap free ratio: %s\n", 2431 option->optionString); 2432 return JNI_EINVAL; 2433 } 2434 if (dminf < 0.0 || dminf > 1.0) { 2435 jio_fprintf(defaultStream::error_stream(), 2436 "-Xminf value (%s) is outside the allowed range [ 0.0 ... 1.0 ]\n", 2437 tail); 2438 return JNI_EINVAL; 2439 } 2440 const uintx uminf = (uintx)(dminf * 100); 2441 if (MaxHeapFreeRatio < uminf) { 2442 jio_fprintf(defaultStream::error_stream(), 2443 "-Xminf value (%s) must be less than or equal to the implicit -Xmaxf value (%.2f)\n", 2444 tail, MaxHeapFreeRatio / 100.0f); 2445 return JNI_EINVAL; 2446 } 2447 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, uminf) != JVMFlag::SUCCESS) { 2448 return JNI_EINVAL; 2449 } 2450 // -Xss 2451 } else if (match_option(option, "-Xss", &tail)) { 2452 intx value = 0; 2453 jint err = parse_xss(option, tail, &value); 2454 if (err != JNI_OK) { 2455 return err; 2456 } 2457 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2458 return JNI_EINVAL; 2459 } 2460 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2461 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2462 julong long_ReservedCodeCacheSize = 0; 2463 2464 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2465 if (errcode != arg_in_range) { 2466 jio_fprintf(defaultStream::error_stream(), 2467 "Invalid maximum code cache size: %s.\n", option->optionString); 2468 return JNI_EINVAL; 2469 } 2470 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2471 return JNI_EINVAL; 2472 } 2473 // -green 2474 } else if (match_option(option, "-green")) { 2475 jio_fprintf(defaultStream::error_stream(), 2476 "Green threads support not available\n"); 2477 return JNI_EINVAL; 2478 // -native 2479 } else if (match_option(option, "-native")) { 2480 // HotSpot always uses native threads, ignore silently for compatibility 2481 // -Xrs 2482 } else if (match_option(option, "-Xrs")) { 2483 // Classic/EVM option, new functionality 2484 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2485 return JNI_EINVAL; 2486 } 2487 // -Xprof 2488 } else if (match_option(option, "-Xprof")) { 2489 char version[256]; 2490 // Obsolete in JDK 10 2491 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2492 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2493 // -Xinternalversion 2494 } else if (match_option(option, "-Xinternalversion")) { 2495 jio_fprintf(defaultStream::output_stream(), "%s\n", 2496 VM_Version::internal_vm_info_string()); 2497 vm_exit(0); 2498 #ifndef PRODUCT 2499 // -Xprintflags 2500 } else if (match_option(option, "-Xprintflags")) { 2501 JVMFlag::printFlags(tty, false); 2502 vm_exit(0); 2503 #endif 2504 // -D 2505 } else if (match_option(option, "-D", &tail)) { 2506 const char* value; 2507 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2508 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2509 // abort if -Djava.endorsed.dirs is set 2510 jio_fprintf(defaultStream::output_stream(), 2511 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2512 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2513 return JNI_EINVAL; 2514 } 2515 if (match_option(option, "-Djava.ext.dirs=", &value) && 2516 *value != '\0' && strcmp(value, "\"\"") != 0) { 2517 // abort if -Djava.ext.dirs is set 2518 jio_fprintf(defaultStream::output_stream(), 2519 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2520 return JNI_EINVAL; 2521 } 2522 // Check for module related properties. They must be set using the modules 2523 // options. For example: use "--add-modules=java.sql", not 2524 // "-Djdk.module.addmods=java.sql" 2525 if (is_internal_module_property(option->optionString + 2)) { 2526 needs_module_property_warning = true; 2527 continue; 2528 } 2529 if (!add_property(tail)) { 2530 return JNI_ENOMEM; 2531 } 2532 // Out of the box management support 2533 if (match_option(option, "-Dcom.sun.management", &tail)) { 2534 #if INCLUDE_MANAGEMENT 2535 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2536 return JNI_EINVAL; 2537 } 2538 // management agent in module jdk.management.agent 2539 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) { 2540 return JNI_ENOMEM; 2541 } 2542 #else 2543 jio_fprintf(defaultStream::output_stream(), 2544 "-Dcom.sun.management is not supported in this VM.\n"); 2545 return JNI_ERR; 2546 #endif 2547 } 2548 // -Xint 2549 } else if (match_option(option, "-Xint")) { 2550 set_mode_flags(_int); 2551 mode_flag_cmd_line = true; 2552 // -Xmixed 2553 } else if (match_option(option, "-Xmixed")) { 2554 set_mode_flags(_mixed); 2555 mode_flag_cmd_line = true; 2556 // -Xcomp 2557 } else if (match_option(option, "-Xcomp")) { 2558 // for testing the compiler; turn off all flags that inhibit compilation 2559 set_mode_flags(_comp); 2560 mode_flag_cmd_line = true; 2561 // -Xshare:dump 2562 } else if (match_option(option, "-Xshare:dump")) { 2563 CDSConfig::enable_dumping_static_archive(); 2564 CDSConfig::set_old_cds_flags_used(); 2565 // -Xshare:on 2566 } else if (match_option(option, "-Xshare:on")) { 2567 UseSharedSpaces = true; 2568 RequireSharedSpaces = true; 2569 CDSConfig::set_old_cds_flags_used(); 2570 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2571 } else if (match_option(option, "-Xshare:auto")) { 2572 UseSharedSpaces = true; 2573 RequireSharedSpaces = false; 2574 xshare_auto_cmd_line = true; 2575 CDSConfig::set_old_cds_flags_used(); 2576 // -Xshare:off 2577 } else if (match_option(option, "-Xshare:off")) { 2578 UseSharedSpaces = false; 2579 RequireSharedSpaces = false; 2580 CDSConfig::set_old_cds_flags_used(); 2581 // -Xverify 2582 } else if (match_option(option, "-Xverify", &tail)) { 2583 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2584 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2585 return JNI_EINVAL; 2586 } 2587 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2588 return JNI_EINVAL; 2589 } 2590 } else if (strcmp(tail, ":remote") == 0) { 2591 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2592 return JNI_EINVAL; 2593 } 2594 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2595 return JNI_EINVAL; 2596 } 2597 } else if (strcmp(tail, ":none") == 0) { 2598 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2599 return JNI_EINVAL; 2600 } 2601 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2602 return JNI_EINVAL; 2603 } 2604 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2605 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2606 return JNI_EINVAL; 2607 } 2608 // -Xdebug 2609 } else if (match_option(option, "-Xdebug")) { 2610 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release."); 2611 } else if (match_option(option, "-Xloggc:", &tail)) { 2612 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2613 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2614 _legacyGCLogging.lastFlag = 2; 2615 _legacyGCLogging.file = os::strdup_check_oom(tail); 2616 } else if (match_option(option, "-Xlog", &tail)) { 2617 bool ret = false; 2618 if (strcmp(tail, ":help") == 0) { 2619 fileStream stream(defaultStream::output_stream()); 2620 LogConfiguration::print_command_line_help(&stream); 2621 vm_exit(0); 2622 } else if (strcmp(tail, ":disable") == 0) { 2623 LogConfiguration::disable_logging(); 2624 ret = true; 2625 } else if (strncmp(tail, ":async", strlen(":async")) == 0) { 2626 const char* async_tail = tail + strlen(":async"); 2627 ret = LogConfiguration::parse_async_argument(async_tail); 2628 } else if (*tail == '\0') { 2629 ret = LogConfiguration::parse_command_line_arguments(); 2630 assert(ret, "-Xlog without arguments should never fail to parse"); 2631 } else if (*tail == ':') { 2632 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2633 } 2634 if (ret == false) { 2635 jio_fprintf(defaultStream::error_stream(), 2636 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2637 tail); 2638 return JNI_EINVAL; 2639 } 2640 // JNI hooks 2641 } else if (match_option(option, "-Xcheck", &tail)) { 2642 if (!strcmp(tail, ":jni")) { 2643 #if !INCLUDE_JNI_CHECK 2644 warning("JNI CHECKING is not supported in this VM"); 2645 #else 2646 CheckJNICalls = true; 2647 #endif // INCLUDE_JNI_CHECK 2648 } else if (is_bad_option(option, args->ignoreUnrecognized, 2649 "check")) { 2650 return JNI_EINVAL; 2651 } 2652 } else if (match_option(option, "vfprintf")) { 2653 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2654 } else if (match_option(option, "exit")) { 2655 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2656 } else if (match_option(option, "abort")) { 2657 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2658 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2659 // and the last option wins. 2660 } else if (match_option(option, "-XX:+NeverTenure")) { 2661 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2662 return JNI_EINVAL; 2663 } 2664 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2665 return JNI_EINVAL; 2666 } 2667 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2668 return JNI_EINVAL; 2669 } 2670 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2671 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2672 return JNI_EINVAL; 2673 } 2674 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2675 return JNI_EINVAL; 2676 } 2677 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2678 return JNI_EINVAL; 2679 } 2680 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2681 uint max_tenuring_thresh = 0; 2682 if (!parse_uint(tail, &max_tenuring_thresh, 0)) { 2683 jio_fprintf(defaultStream::error_stream(), 2684 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2685 return JNI_EINVAL; 2686 } 2687 2688 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2689 return JNI_EINVAL; 2690 } 2691 2692 if (MaxTenuringThreshold == 0) { 2693 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2694 return JNI_EINVAL; 2695 } 2696 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2697 return JNI_EINVAL; 2698 } 2699 } else { 2700 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2701 return JNI_EINVAL; 2702 } 2703 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2704 return JNI_EINVAL; 2705 } 2706 } 2707 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2708 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2709 return JNI_EINVAL; 2710 } 2711 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2712 return JNI_EINVAL; 2713 } 2714 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2715 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2716 return JNI_EINVAL; 2717 } 2718 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2719 return JNI_EINVAL; 2720 } 2721 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2722 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2723 return JNI_EINVAL; 2724 } 2725 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2726 return JNI_EINVAL; 2727 } 2728 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2729 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2730 return JNI_EINVAL; 2731 } 2732 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2733 return JNI_EINVAL; 2734 } 2735 } else if (match_option(option, "--finalization=", &tail)) { 2736 if (strcmp(tail, "enabled") == 0) { 2737 InstanceKlass::set_finalization_enabled(true); 2738 } else if (strcmp(tail, "disabled") == 0) { 2739 InstanceKlass::set_finalization_enabled(false); 2740 } else { 2741 jio_fprintf(defaultStream::error_stream(), 2742 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2743 tail); 2744 return JNI_EINVAL; 2745 } 2746 #if !defined(DTRACE_ENABLED) 2747 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2748 jio_fprintf(defaultStream::error_stream(), 2749 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2750 return JNI_EINVAL; 2751 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2752 jio_fprintf(defaultStream::error_stream(), 2753 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2754 return JNI_EINVAL; 2755 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2756 jio_fprintf(defaultStream::error_stream(), 2757 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2758 return JNI_EINVAL; 2759 #endif // !defined(DTRACE_ENABLED) 2760 #ifdef ASSERT 2761 } else if (match_option(option, "-XX:+FullGCALot")) { 2762 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2763 return JNI_EINVAL; 2764 } 2765 #endif 2766 #if !INCLUDE_MANAGEMENT 2767 } else if (match_option(option, "-XX:+ManagementServer")) { 2768 jio_fprintf(defaultStream::error_stream(), 2769 "ManagementServer is not supported in this VM.\n"); 2770 return JNI_ERR; 2771 #endif // INCLUDE_MANAGEMENT 2772 #if INCLUDE_JVMCI 2773 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) { 2774 if (EnableJVMCIProduct) { 2775 jio_fprintf(defaultStream::error_stream(), 2776 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n"); 2777 return JNI_EINVAL; 2778 } 2779 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) { 2780 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT"); 2781 if (use_graal_jit) { 2782 const char* jvmci_compiler = get_property("jvmci.Compiler"); 2783 if (jvmci_compiler != nullptr) { 2784 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) { 2785 jio_fprintf(defaultStream::error_stream(), 2786 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler); 2787 return JNI_ERR; 2788 } 2789 } else if (!add_property("jvmci.Compiler=graal")) { 2790 return JNI_ENOMEM; 2791 } 2792 } 2793 2794 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before 2795 if (EnableJVMCIProduct) { 2796 continue; 2797 } 2798 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2799 // Allow this flag if it has been unlocked. 2800 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) { 2801 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) { 2802 jio_fprintf(defaultStream::error_stream(), 2803 "Unable to enable JVMCI in product mode\n"); 2804 return JNI_ERR; 2805 } 2806 } 2807 // The flag was locked so process normally to report that error 2808 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2809 return JNI_EINVAL; 2810 } 2811 #endif // INCLUDE_JVMCI 2812 #if INCLUDE_JFR 2813 } else if (match_jfr_option(&option)) { 2814 return JNI_EINVAL; 2815 #endif 2816 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2817 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2818 // already been handled 2819 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2820 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2821 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2822 return JNI_EINVAL; 2823 } 2824 } 2825 // Unknown option 2826 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2827 return JNI_ERR; 2828 } 2829 } 2830 2831 // PrintSharedArchiveAndExit will turn on 2832 // -Xshare:on 2833 // -Xlog:class+path=info 2834 if (PrintSharedArchiveAndExit) { 2835 UseSharedSpaces = true; 2836 RequireSharedSpaces = true; 2837 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2838 } 2839 2840 fix_appclasspath(); 2841 2842 return JNI_OK; 2843 } 2844 2845 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) { 2846 // For java.base check for duplicate --patch-module options being specified on the command line. 2847 // This check is only required for java.base, all other duplicate module specifications 2848 // will be checked during module system initialization. The module system initialization 2849 // will throw an ExceptionInInitializerError if this situation occurs. 2850 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2851 if (patch_mod_javabase) { 2852 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2853 } else { 2854 patch_mod_javabase = true; 2855 } 2856 } 2857 2858 // Create GrowableArray lazily, only if --patch-module has been specified 2859 if (_patch_mod_prefix == nullptr) { 2860 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2861 } 2862 2863 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2864 } 2865 2866 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2867 // 2868 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2869 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2870 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2871 // path is treated as the current directory. 2872 // 2873 // This causes problems with CDS, which requires that all directories specified in the classpath 2874 // must be empty. In most cases, applications do NOT want to load classes from the current 2875 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2876 // scripts compatible with CDS. 2877 void Arguments::fix_appclasspath() { 2878 if (IgnoreEmptyClassPaths) { 2879 const char separator = *os::path_separator(); 2880 const char* src = _java_class_path->value(); 2881 2882 // skip over all the leading empty paths 2883 while (*src == separator) { 2884 src ++; 2885 } 2886 2887 char* copy = os::strdup_check_oom(src, mtArguments); 2888 2889 // trim all trailing empty paths 2890 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 2891 *tail = '\0'; 2892 } 2893 2894 char from[3] = {separator, separator, '\0'}; 2895 char to [2] = {separator, '\0'}; 2896 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 2897 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 2898 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 2899 } 2900 2901 _java_class_path->set_writeable_value(copy); 2902 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 2903 } 2904 } 2905 2906 jint Arguments::finalize_vm_init_args() { 2907 // check if the default lib/endorsed directory exists; if so, error 2908 char path[JVM_MAXPATHLEN]; 2909 const char* fileSep = os::file_separator(); 2910 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 2911 2912 DIR* dir = os::opendir(path); 2913 if (dir != nullptr) { 2914 jio_fprintf(defaultStream::output_stream(), 2915 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 2916 "in modular form will be supported via the concept of upgradeable modules.\n"); 2917 os::closedir(dir); 2918 return JNI_ERR; 2919 } 2920 2921 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 2922 dir = os::opendir(path); 2923 if (dir != nullptr) { 2924 jio_fprintf(defaultStream::output_stream(), 2925 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 2926 "Use -classpath instead.\n."); 2927 os::closedir(dir); 2928 return JNI_ERR; 2929 } 2930 2931 // This must be done after all arguments have been processed 2932 // and the container support has been initialized since AggressiveHeap 2933 // relies on the amount of total memory available. 2934 if (AggressiveHeap) { 2935 jint result = set_aggressive_heap_flags(); 2936 if (result != JNI_OK) { 2937 return result; 2938 } 2939 } 2940 2941 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 2942 // but like -Xint, leave compilation thresholds unaffected. 2943 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 2944 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 2945 set_mode_flags(_int); 2946 } 2947 2948 #ifdef ZERO 2949 // Zero always runs in interpreted mode 2950 set_mode_flags(_int); 2951 #endif 2952 2953 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 2954 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 2955 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 2956 } 2957 2958 #if !COMPILER2_OR_JVMCI 2959 // Don't degrade server performance for footprint 2960 if (FLAG_IS_DEFAULT(UseLargePages) && 2961 MaxHeapSize < LargePageHeapSizeThreshold) { 2962 // No need for large granularity pages w/small heaps. 2963 // Note that large pages are enabled/disabled for both the 2964 // Java heap and the code cache. 2965 FLAG_SET_DEFAULT(UseLargePages, false); 2966 } 2967 2968 UNSUPPORTED_OPTION(ProfileInterpreter); 2969 #endif 2970 2971 // Parse the CompilationMode flag 2972 if (!CompilationModeFlag::initialize()) { 2973 return JNI_ERR; 2974 } 2975 2976 if (!check_vm_args_consistency()) { 2977 return JNI_ERR; 2978 } 2979 2980 2981 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 2982 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 2983 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 2984 2985 return JNI_OK; 2986 } 2987 2988 // Helper class for controlling the lifetime of JavaVMInitArgs 2989 // objects. The contents of the JavaVMInitArgs are guaranteed to be 2990 // deleted on the destruction of the ScopedVMInitArgs object. 2991 class ScopedVMInitArgs : public StackObj { 2992 private: 2993 JavaVMInitArgs _args; 2994 char* _container_name; 2995 bool _is_set; 2996 char* _vm_options_file_arg; 2997 2998 public: 2999 ScopedVMInitArgs(const char *container_name) { 3000 _args.version = JNI_VERSION_1_2; 3001 _args.nOptions = 0; 3002 _args.options = nullptr; 3003 _args.ignoreUnrecognized = false; 3004 _container_name = (char *)container_name; 3005 _is_set = false; 3006 _vm_options_file_arg = nullptr; 3007 } 3008 3009 // Populates the JavaVMInitArgs object represented by this 3010 // ScopedVMInitArgs object with the arguments in options. The 3011 // allocated memory is deleted by the destructor. If this method 3012 // returns anything other than JNI_OK, then this object is in a 3013 // partially constructed state, and should be abandoned. 3014 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3015 _is_set = true; 3016 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3017 JavaVMOption, options->length(), mtArguments); 3018 if (options_arr == nullptr) { 3019 return JNI_ENOMEM; 3020 } 3021 _args.options = options_arr; 3022 3023 for (int i = 0; i < options->length(); i++) { 3024 options_arr[i] = options->at(i); 3025 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3026 if (options_arr[i].optionString == nullptr) { 3027 // Rely on the destructor to do cleanup. 3028 _args.nOptions = i; 3029 return JNI_ENOMEM; 3030 } 3031 } 3032 3033 _args.nOptions = options->length(); 3034 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3035 return JNI_OK; 3036 } 3037 3038 JavaVMInitArgs* get() { return &_args; } 3039 char* container_name() { return _container_name; } 3040 bool is_set() { return _is_set; } 3041 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; } 3042 char* vm_options_file_arg() { return _vm_options_file_arg; } 3043 3044 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3045 if (_vm_options_file_arg != nullptr) { 3046 os::free(_vm_options_file_arg); 3047 } 3048 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3049 } 3050 3051 ~ScopedVMInitArgs() { 3052 if (_vm_options_file_arg != nullptr) { 3053 os::free(_vm_options_file_arg); 3054 } 3055 if (_args.options == nullptr) return; 3056 for (int i = 0; i < _args.nOptions; i++) { 3057 os::free(_args.options[i].optionString); 3058 } 3059 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3060 } 3061 3062 // Insert options into this option list, to replace option at 3063 // vm_options_file_pos (-XX:VMOptionsFile) 3064 jint insert(const JavaVMInitArgs* args, 3065 const JavaVMInitArgs* args_to_insert, 3066 const int vm_options_file_pos) { 3067 assert(_args.options == nullptr, "shouldn't be set yet"); 3068 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3069 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3070 3071 int length = args->nOptions + args_to_insert->nOptions - 1; 3072 // Construct new option array 3073 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3074 for (int i = 0; i < args->nOptions; i++) { 3075 if (i == vm_options_file_pos) { 3076 // insert the new options starting at the same place as the 3077 // -XX:VMOptionsFile option 3078 for (int j = 0; j < args_to_insert->nOptions; j++) { 3079 options.push(args_to_insert->options[j]); 3080 } 3081 } else { 3082 options.push(args->options[i]); 3083 } 3084 } 3085 // make into options array 3086 return set_args(&options); 3087 } 3088 }; 3089 3090 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3091 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3092 } 3093 3094 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3095 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3096 } 3097 3098 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) { 3099 for (int index = args->nOptions - 1; index >= 0; index--) { 3100 JavaVMOption* option = args->options + index; 3101 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) { 3102 return option; 3103 } 3104 } 3105 3106 return nullptr; 3107 } 3108 3109 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args, 3110 ScopedVMInitArgs* jdk_aot_vm_options_args) { 3111 // Don't bother scanning all the args if this env variable is not set 3112 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) { 3113 return JNI_OK; 3114 } 3115 3116 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value 3117 // of AOTMode. 3118 JavaVMOption* option = nullptr; 3119 for (int i = all_args->length() - 1; i >= 0; i--) { 3120 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) { 3121 break; 3122 } 3123 } 3124 3125 if (option != nullptr) { 3126 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet, 3127 // so its value is not reflected inside the global variable AOTMode. 3128 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) { 3129 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS 3130 } 3131 } else { 3132 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode, 3133 // which would have been set inside process_settings_file(); 3134 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) { 3135 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS 3136 } 3137 } 3138 3139 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args); 3140 } 3141 3142 jint Arguments::parse_options_environment_variable(const char* name, 3143 ScopedVMInitArgs* vm_args) { 3144 char *buffer = ::getenv(name); 3145 3146 // Don't check this environment variable if user has special privileges 3147 // (e.g. unix su command). 3148 if (buffer == nullptr || os::have_special_privileges()) { 3149 return JNI_OK; 3150 } 3151 3152 if ((buffer = os::strdup(buffer)) == nullptr) { 3153 return JNI_ENOMEM; 3154 } 3155 3156 jio_fprintf(defaultStream::error_stream(), 3157 "Picked up %s: %s\n", name, buffer); 3158 3159 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3160 3161 os::free(buffer); 3162 return retcode; 3163 } 3164 3165 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3166 // read file into buffer 3167 int fd = ::open(file_name, O_RDONLY); 3168 if (fd < 0) { 3169 jio_fprintf(defaultStream::error_stream(), 3170 "Could not open options file '%s'\n", 3171 file_name); 3172 return JNI_ERR; 3173 } 3174 3175 struct stat stbuf; 3176 int retcode = os::stat(file_name, &stbuf); 3177 if (retcode != 0) { 3178 jio_fprintf(defaultStream::error_stream(), 3179 "Could not stat options file '%s'\n", 3180 file_name); 3181 ::close(fd); 3182 return JNI_ERR; 3183 } 3184 3185 if (stbuf.st_size == 0) { 3186 // tell caller there is no option data and that is ok 3187 ::close(fd); 3188 return JNI_OK; 3189 } 3190 3191 // '+ 1' for null termination even with max bytes 3192 size_t bytes_alloc = stbuf.st_size + 1; 3193 3194 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3195 if (nullptr == buf) { 3196 jio_fprintf(defaultStream::error_stream(), 3197 "Could not allocate read buffer for options file parse\n"); 3198 ::close(fd); 3199 return JNI_ENOMEM; 3200 } 3201 3202 memset(buf, 0, bytes_alloc); 3203 3204 // Fill buffer 3205 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3206 ::close(fd); 3207 if (bytes_read < 0) { 3208 FREE_C_HEAP_ARRAY(char, buf); 3209 jio_fprintf(defaultStream::error_stream(), 3210 "Could not read options file '%s'\n", file_name); 3211 return JNI_ERR; 3212 } 3213 3214 if (bytes_read == 0) { 3215 // tell caller there is no option data and that is ok 3216 FREE_C_HEAP_ARRAY(char, buf); 3217 return JNI_OK; 3218 } 3219 3220 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3221 3222 FREE_C_HEAP_ARRAY(char, buf); 3223 return retcode; 3224 } 3225 3226 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3227 // Construct option array 3228 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3229 3230 // some pointers to help with parsing 3231 char *buffer_end = buffer + buf_len; 3232 char *opt_hd = buffer; 3233 char *wrt = buffer; 3234 char *rd = buffer; 3235 3236 // parse all options 3237 while (rd < buffer_end) { 3238 // skip leading white space from the input string 3239 while (rd < buffer_end && isspace((unsigned char) *rd)) { 3240 rd++; 3241 } 3242 3243 if (rd >= buffer_end) { 3244 break; 3245 } 3246 3247 // Remember this is where we found the head of the token. 3248 opt_hd = wrt; 3249 3250 // Tokens are strings of non white space characters separated 3251 // by one or more white spaces. 3252 while (rd < buffer_end && !isspace((unsigned char) *rd)) { 3253 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3254 int quote = *rd; // matching quote to look for 3255 rd++; // don't copy open quote 3256 while (rd < buffer_end && *rd != quote) { 3257 // include everything (even spaces) 3258 // up until the close quote 3259 *wrt++ = *rd++; // copy to option string 3260 } 3261 3262 if (rd < buffer_end) { 3263 rd++; // don't copy close quote 3264 } else { 3265 // did not see closing quote 3266 jio_fprintf(defaultStream::error_stream(), 3267 "Unmatched quote in %s\n", name); 3268 return JNI_ERR; 3269 } 3270 } else { 3271 *wrt++ = *rd++; // copy to option string 3272 } 3273 } 3274 3275 // steal a white space character and set it to null 3276 *wrt++ = '\0'; 3277 // We now have a complete token 3278 3279 JavaVMOption option; 3280 option.optionString = opt_hd; 3281 option.extraInfo = nullptr; 3282 3283 options.append(option); // Fill in option 3284 3285 rd++; // Advance to next character 3286 } 3287 3288 // Fill out JavaVMInitArgs structure. 3289 return vm_args->set_args(&options); 3290 } 3291 3292 #ifndef PRODUCT 3293 // Determine whether LogVMOutput should be implicitly turned on. 3294 static bool use_vm_log() { 3295 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3296 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3297 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3298 PrintAssembly || TraceDeoptimization || 3299 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3300 return true; 3301 } 3302 3303 #ifdef COMPILER1 3304 if (PrintC1Statistics) { 3305 return true; 3306 } 3307 #endif // COMPILER1 3308 3309 #ifdef COMPILER2 3310 if (PrintOptoAssembly || PrintOptoStatistics) { 3311 return true; 3312 } 3313 #endif // COMPILER2 3314 3315 return false; 3316 } 3317 3318 #endif // PRODUCT 3319 3320 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3321 for (int index = 0; index < args->nOptions; index++) { 3322 const JavaVMOption* option = args->options + index; 3323 const char* tail; 3324 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3325 return true; 3326 } 3327 } 3328 return false; 3329 } 3330 3331 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3332 const char* vm_options_file, 3333 const int vm_options_file_pos, 3334 ScopedVMInitArgs* vm_options_file_args, 3335 ScopedVMInitArgs* args_out) { 3336 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3337 if (code != JNI_OK) { 3338 return code; 3339 } 3340 3341 if (vm_options_file_args->get()->nOptions < 1) { 3342 return JNI_OK; 3343 } 3344 3345 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3346 jio_fprintf(defaultStream::error_stream(), 3347 "A VM options file may not refer to a VM options file. " 3348 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3349 "options file '%s' in options container '%s' is an error.\n", 3350 vm_options_file_args->vm_options_file_arg(), 3351 vm_options_file_args->container_name()); 3352 return JNI_EINVAL; 3353 } 3354 3355 return args_out->insert(args, vm_options_file_args->get(), 3356 vm_options_file_pos); 3357 } 3358 3359 // Expand -XX:VMOptionsFile found in args_in as needed. 3360 // mod_args and args_out parameters may return values as needed. 3361 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3362 ScopedVMInitArgs* mod_args, 3363 JavaVMInitArgs** args_out) { 3364 jint code = match_special_option_and_act(args_in, mod_args); 3365 if (code != JNI_OK) { 3366 return code; 3367 } 3368 3369 if (mod_args->is_set()) { 3370 // args_in contains -XX:VMOptionsFile and mod_args contains the 3371 // original options from args_in along with the options expanded 3372 // from the VMOptionsFile. Return a short-hand to the caller. 3373 *args_out = mod_args->get(); 3374 } else { 3375 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3376 } 3377 return JNI_OK; 3378 } 3379 3380 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3381 ScopedVMInitArgs* args_out) { 3382 // Remaining part of option string 3383 const char* tail; 3384 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3385 3386 for (int index = 0; index < args->nOptions; index++) { 3387 const JavaVMOption* option = args->options + index; 3388 if (match_option(option, "-XX:Flags=", &tail)) { 3389 Arguments::set_jvm_flags_file(tail); 3390 continue; 3391 } 3392 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3393 if (vm_options_file_args.found_vm_options_file_arg()) { 3394 jio_fprintf(defaultStream::error_stream(), 3395 "The option '%s' is already specified in the options " 3396 "container '%s' so the specification of '%s' in the " 3397 "same options container is an error.\n", 3398 vm_options_file_args.vm_options_file_arg(), 3399 vm_options_file_args.container_name(), 3400 option->optionString); 3401 return JNI_EINVAL; 3402 } 3403 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3404 // If there's a VMOptionsFile, parse that 3405 jint code = insert_vm_options_file(args, tail, index, 3406 &vm_options_file_args, args_out); 3407 if (code != JNI_OK) { 3408 return code; 3409 } 3410 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3411 if (args_out->is_set()) { 3412 // The VMOptions file inserted some options so switch 'args' 3413 // to the new set of options, and continue processing which 3414 // preserves "last option wins" semantics. 3415 args = args_out->get(); 3416 // The first option from the VMOptionsFile replaces the 3417 // current option. So we back track to process the 3418 // replacement option. 3419 index--; 3420 } 3421 continue; 3422 } 3423 if (match_option(option, "-XX:+PrintVMOptions")) { 3424 PrintVMOptions = true; 3425 continue; 3426 } 3427 if (match_option(option, "-XX:-PrintVMOptions")) { 3428 PrintVMOptions = false; 3429 continue; 3430 } 3431 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3432 IgnoreUnrecognizedVMOptions = true; 3433 continue; 3434 } 3435 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3436 IgnoreUnrecognizedVMOptions = false; 3437 continue; 3438 } 3439 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3440 JVMFlag::printFlags(tty, false); 3441 vm_exit(0); 3442 } 3443 3444 #ifndef PRODUCT 3445 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3446 JVMFlag::printFlags(tty, true); 3447 vm_exit(0); 3448 } 3449 #endif 3450 } 3451 return JNI_OK; 3452 } 3453 3454 static void print_options(const JavaVMInitArgs *args) { 3455 const char* tail; 3456 for (int index = 0; index < args->nOptions; index++) { 3457 const JavaVMOption *option = args->options + index; 3458 if (match_option(option, "-XX:", &tail)) { 3459 logOption(tail); 3460 } 3461 } 3462 } 3463 3464 bool Arguments::handle_deprecated_print_gc_flags() { 3465 if (PrintGC) { 3466 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3467 } 3468 if (PrintGCDetails) { 3469 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3470 } 3471 3472 if (_legacyGCLogging.lastFlag == 2) { 3473 // -Xloggc was used to specify a filename 3474 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3475 3476 LogTarget(Error, logging) target; 3477 LogStream errstream(target); 3478 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream); 3479 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3480 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3481 } 3482 return true; 3483 } 3484 3485 static void apply_debugger_ergo() { 3486 #ifdef ASSERT 3487 if (ReplayCompiles) { 3488 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3489 } 3490 3491 if (UseDebuggerErgo) { 3492 // Turn on sub-flags 3493 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3494 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3495 } 3496 3497 if (UseDebuggerErgo2) { 3498 // Debugging with limited number of CPUs 3499 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3500 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3501 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3502 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3503 } 3504 #endif // ASSERT 3505 } 3506 3507 // Parse entry point called from JNI_CreateJavaVM 3508 3509 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3510 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3511 JVMFlag::check_all_flag_declarations(); 3512 3513 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3514 const char* hotspotrc = ".hotspotrc"; 3515 bool settings_file_specified = false; 3516 bool needs_hotspotrc_warning = false; 3517 ScopedVMInitArgs initial_vm_options_args(""); 3518 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3519 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3520 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'"); 3521 3522 // Pointers to current working set of containers 3523 JavaVMInitArgs* cur_cmd_args; 3524 JavaVMInitArgs* cur_vm_options_args; 3525 JavaVMInitArgs* cur_java_options_args; 3526 JavaVMInitArgs* cur_java_tool_options_args; 3527 JavaVMInitArgs* cur_jdk_aot_vm_options_args; 3528 3529 // Containers for modified/expanded options 3530 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3531 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3532 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3533 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3534 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'"); 3535 3536 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args; 3537 3538 jint code = 3539 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3540 if (code != JNI_OK) { 3541 return code; 3542 } 3543 3544 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM. 3545 // This is an undocumented feature. 3546 code = parse_java_options_environment_variable(&initial_java_options_args); 3547 if (code != JNI_OK) { 3548 return code; 3549 } 3550 3551 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3552 char *vmoptions = ClassLoader::lookup_vm_options(); 3553 if (vmoptions != nullptr) { 3554 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3555 FREE_C_HEAP_ARRAY(char, vmoptions); 3556 if (code != JNI_OK) { 3557 return code; 3558 } 3559 } 3560 3561 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3562 &mod_java_tool_options_args, 3563 &cur_java_tool_options_args); 3564 if (code != JNI_OK) { 3565 return code; 3566 } 3567 3568 code = expand_vm_options_as_needed(initial_cmd_args, 3569 &mod_cmd_args, 3570 &cur_cmd_args); 3571 if (code != JNI_OK) { 3572 return code; 3573 } 3574 3575 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3576 &mod_java_options_args, 3577 &cur_java_options_args); 3578 if (code != JNI_OK) { 3579 return code; 3580 } 3581 3582 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3583 &mod_vm_options_args, 3584 &cur_vm_options_args); 3585 if (code != JNI_OK) { 3586 return code; 3587 } 3588 3589 const char* flags_file = Arguments::get_jvm_flags_file(); 3590 settings_file_specified = (flags_file != nullptr); 3591 3592 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags. 3593 if (settings_file_specified) { 3594 if (!process_settings_file(flags_file, true, 3595 IgnoreUnrecognizedVMOptions)) { 3596 return JNI_EINVAL; 3597 } 3598 } else { 3599 #ifdef ASSERT 3600 // Parse default .hotspotrc settings file 3601 if (!process_settings_file(".hotspotrc", false, 3602 IgnoreUnrecognizedVMOptions)) { 3603 return JNI_EINVAL; 3604 } 3605 #else 3606 struct stat buf; 3607 if (os::stat(hotspotrc, &buf) == 0) { 3608 needs_hotspotrc_warning = true; 3609 } 3610 #endif 3611 } 3612 3613 // The settings in the args are applied in this order to the the JVM global flags. 3614 // For historical reasons, the order is DIFFERENT than the scanning order of 3615 // the above expand_vm_options_as_needed() calls. 3616 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE}); 3617 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR}); 3618 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE}); 3619 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR}); 3620 3621 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all 3622 // the options that have been gathered above. 3623 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args); 3624 if (code != JNI_OK) { 3625 return code; 3626 } 3627 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(), 3628 &mod_jdk_aot_vm_options_args, 3629 &cur_jdk_aot_vm_options_args); 3630 if (code != JNI_OK) { 3631 return code; 3632 } 3633 3634 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) { 3635 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index; 3636 const char* optionString = option->optionString; 3637 if (strstr(optionString, "-XX:AOTMode=") == optionString && 3638 strcmp(optionString, "-XX:AOTMode=create") != 0) { 3639 jio_fprintf(defaultStream::error_stream(), 3640 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString); 3641 return JNI_ERR; 3642 } 3643 } 3644 3645 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR}); 3646 3647 if (IgnoreUnrecognizedVMOptions) { 3648 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of 3649 // the JDK so it shouldn't have bad options. 3650 cur_cmd_args->ignoreUnrecognized = true; 3651 cur_java_tool_options_args->ignoreUnrecognized = true; 3652 cur_java_options_args->ignoreUnrecognized = true; 3653 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true; 3654 } 3655 3656 if (PrintVMOptions) { 3657 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed. 3658 print_options(cur_java_tool_options_args); 3659 print_options(cur_cmd_args); 3660 print_options(cur_java_options_args); 3661 print_options(cur_jdk_aot_vm_options_args); 3662 } 3663 3664 // Apply the settings in these args to the JVM global flags. 3665 jint result = parse_vm_init_args(&all_args); 3666 3667 if (result != JNI_OK) { 3668 return result; 3669 } 3670 3671 // Delay warning until here so that we've had a chance to process 3672 // the -XX:-PrintWarnings flag 3673 if (needs_hotspotrc_warning) { 3674 warning("%s file is present but has been ignored. " 3675 "Run with -XX:Flags=%s to load the file.", 3676 hotspotrc, hotspotrc); 3677 } 3678 3679 if (needs_module_property_warning) { 3680 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3681 " names that are reserved for internal use."); 3682 } 3683 3684 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3685 UNSUPPORTED_OPTION(UseLargePages); 3686 #endif 3687 3688 #if defined(AIX) 3689 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3690 #endif 3691 3692 #ifndef PRODUCT 3693 if (TraceBytecodesAt != 0) { 3694 TraceBytecodes = true; 3695 } 3696 #endif // PRODUCT 3697 3698 if (ScavengeRootsInCode == 0) { 3699 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3700 warning("Forcing ScavengeRootsInCode non-zero"); 3701 } 3702 ScavengeRootsInCode = 1; 3703 } 3704 3705 if (!handle_deprecated_print_gc_flags()) { 3706 return JNI_EINVAL; 3707 } 3708 3709 // Set object alignment values. 3710 set_object_alignment(); 3711 3712 #if !INCLUDE_CDS 3713 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) { 3714 jio_fprintf(defaultStream::error_stream(), 3715 "Shared spaces are not supported in this VM\n"); 3716 return JNI_ERR; 3717 } 3718 if (DumpLoadedClassList != nullptr) { 3719 jio_fprintf(defaultStream::error_stream(), 3720 "DumpLoadedClassList is not supported in this VM\n"); 3721 return JNI_ERR; 3722 } 3723 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) || 3724 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) { 3725 warning("Shared spaces are not supported in this VM"); 3726 UseSharedSpaces = false; 3727 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3728 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot)); 3729 } 3730 no_shared_spaces("CDS Disabled"); 3731 #endif // INCLUDE_CDS 3732 3733 // Verify NMT arguments 3734 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 3735 if (lvl == NMT_unknown) { 3736 jio_fprintf(defaultStream::error_stream(), 3737 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n"); 3738 return JNI_ERR; 3739 } 3740 if (PrintNMTStatistics && lvl == NMT_off) { 3741 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 3742 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 3743 } 3744 3745 bool trace_dependencies = log_is_enabled(Debug, dependencies); 3746 if (trace_dependencies && VerifyDependencies) { 3747 warning("dependency logging results may be inflated by VerifyDependencies"); 3748 } 3749 3750 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) || 3751 log_is_enabled(Info, class, load, cause); 3752 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) { 3753 warning("class load cause logging will not produce output without LogClassLoadingCauseFor"); 3754 } 3755 3756 apply_debugger_ergo(); 3757 3758 // The VMThread needs to stop now and then to execute these debug options. 3759 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) { 3760 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000); 3761 } 3762 3763 if (log_is_enabled(Info, arguments)) { 3764 LogStream st(Log(arguments)::info()); 3765 Arguments::print_on(&st); 3766 } 3767 3768 return JNI_OK; 3769 } 3770 3771 void Arguments::set_compact_headers_flags() { 3772 #ifdef _LP64 3773 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) { 3774 warning("Compact object headers require compressed class pointers. Disabling compact object headers."); 3775 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false); 3776 } 3777 if (UseCompactObjectHeaders && !UseObjectMonitorTable) { 3778 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable. 3779 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) { 3780 FLAG_SET_DEFAULT(UseObjectMonitorTable, true); 3781 3782 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders. 3783 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) { 3784 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false); 3785 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable. 3786 } else { 3787 FLAG_SET_DEFAULT(UseObjectMonitorTable, true); 3788 } 3789 } 3790 if (UseCompactObjectHeaders && !UseCompressedClassPointers) { 3791 FLAG_SET_DEFAULT(UseCompressedClassPointers, true); 3792 } 3793 #endif 3794 } 3795 3796 jint Arguments::apply_ergo() { 3797 // Set flags based on ergonomics. 3798 jint result = set_ergonomics_flags(); 3799 if (result != JNI_OK) return result; 3800 3801 // Set heap size based on available physical memory 3802 set_heap_size(); 3803 3804 GCConfig::arguments()->initialize(); 3805 3806 set_compact_headers_flags(); 3807 3808 if (UseCompressedClassPointers) { 3809 CompressedKlassPointers::pre_initialize(); 3810 } 3811 3812 CDSConfig::ergo_initialize(); 3813 3814 // Initialize Metaspace flags and alignments 3815 Metaspace::ergo_initialize(); 3816 3817 if (!StringDedup::ergo_initialize()) { 3818 return JNI_EINVAL; 3819 } 3820 3821 // Set compiler flags after GC is selected and GC specific 3822 // flags (LoopStripMiningIter) are set. 3823 CompilerConfig::ergo_initialize(); 3824 3825 // Set bytecode rewriting flags 3826 set_bytecode_flags(); 3827 3828 // Set flags if aggressive optimization flags are enabled 3829 jint code = set_aggressive_opts_flags(); 3830 if (code != JNI_OK) { 3831 return code; 3832 } 3833 3834 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) { 3835 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table()); 3836 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) { 3837 warning("UseSecondarySupersTable is not supported"); 3838 FLAG_SET_DEFAULT(UseSecondarySupersTable, false); 3839 } 3840 if (!UseSecondarySupersTable) { 3841 FLAG_SET_DEFAULT(StressSecondarySupers, false); 3842 FLAG_SET_DEFAULT(VerifySecondarySupers, false); 3843 } 3844 3845 #ifdef ZERO 3846 // Clear flags not supported on zero. 3847 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3848 #endif // ZERO 3849 3850 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3851 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3852 DebugNonSafepoints = true; 3853 } 3854 3855 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3856 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3857 } 3858 3859 // Treat the odd case where local verification is enabled but remote 3860 // verification is not as if both were enabled. 3861 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 3862 log_info(verification)("Turning on remote verification because local verification is on"); 3863 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 3864 } 3865 3866 #ifndef PRODUCT 3867 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3868 if (use_vm_log()) { 3869 LogVMOutput = true; 3870 } 3871 } 3872 #endif // PRODUCT 3873 3874 if (PrintCommandLineFlags) { 3875 JVMFlag::printSetFlags(tty); 3876 } 3877 3878 #if COMPILER2_OR_JVMCI 3879 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 3880 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 3881 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 3882 } 3883 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 3884 3885 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 3886 if (!EnableVectorReboxing) { 3887 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 3888 } else { 3889 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 3890 } 3891 } 3892 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 3893 } 3894 #endif // COMPILER2_OR_JVMCI 3895 3896 #ifdef COMPILER2 3897 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) { 3898 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off."); 3899 FLAG_SET_ERGO(UseProfiledLoopPredicate, false); 3900 } 3901 #endif // COMPILER2 3902 3903 if (log_is_enabled(Info, perf, class, link)) { 3904 if (!UsePerfData) { 3905 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off."); 3906 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link)); 3907 assert(!log_is_enabled(Info, perf, class, link), "sanity"); 3908 } 3909 } 3910 3911 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 3912 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 3913 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 3914 } 3915 } 3916 return JNI_OK; 3917 } 3918 3919 jint Arguments::adjust_after_os() { 3920 if (UseNUMA) { 3921 if (UseParallelGC) { 3922 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3923 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3924 } 3925 } 3926 } 3927 return JNI_OK; 3928 } 3929 3930 int Arguments::PropertyList_count(SystemProperty* pl) { 3931 int count = 0; 3932 while(pl != nullptr) { 3933 count++; 3934 pl = pl->next(); 3935 } 3936 return count; 3937 } 3938 3939 // Return the number of readable properties. 3940 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 3941 int count = 0; 3942 while(pl != nullptr) { 3943 if (pl->readable()) { 3944 count++; 3945 } 3946 pl = pl->next(); 3947 } 3948 return count; 3949 } 3950 3951 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3952 assert(key != nullptr, "just checking"); 3953 SystemProperty* prop; 3954 for (prop = pl; prop != nullptr; prop = prop->next()) { 3955 if (strcmp(key, prop->key()) == 0) return prop->value(); 3956 } 3957 return nullptr; 3958 } 3959 3960 // Return the value of the requested property provided that it is a readable property. 3961 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 3962 assert(key != nullptr, "just checking"); 3963 SystemProperty* prop; 3964 // Return the property value if the keys match and the property is not internal or 3965 // it's the special internal property "jdk.boot.class.path.append". 3966 for (prop = pl; prop != nullptr; prop = prop->next()) { 3967 if (strcmp(key, prop->key()) == 0) { 3968 if (!prop->internal()) { 3969 return prop->value(); 3970 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 3971 return prop->value(); 3972 } else { 3973 // Property is internal and not jdk.boot.class.path.append so return null. 3974 return nullptr; 3975 } 3976 } 3977 } 3978 return nullptr; 3979 } 3980 3981 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3982 SystemProperty* p = *plist; 3983 if (p == nullptr) { 3984 *plist = new_p; 3985 } else { 3986 while (p->next() != nullptr) { 3987 p = p->next(); 3988 } 3989 p->set_next(new_p); 3990 } 3991 } 3992 3993 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 3994 bool writeable, bool internal) { 3995 if (plist == nullptr) 3996 return; 3997 3998 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 3999 PropertyList_add(plist, new_p); 4000 } 4001 4002 void Arguments::PropertyList_add(SystemProperty *element) { 4003 PropertyList_add(&_system_properties, element); 4004 } 4005 4006 // This add maintains unique property key in the list. 4007 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4008 PropertyAppendable append, PropertyWriteable writeable, 4009 PropertyInternal internal) { 4010 if (plist == nullptr) 4011 return; 4012 4013 // If property key exists and is writeable, then update with new value. 4014 // Trying to update a non-writeable property is silently ignored. 4015 SystemProperty* prop; 4016 for (prop = *plist; prop != nullptr; prop = prop->next()) { 4017 if (strcmp(k, prop->key()) == 0) { 4018 if (append == AppendProperty) { 4019 prop->append_writeable_value(v); 4020 } else { 4021 prop->set_writeable_value(v); 4022 } 4023 return; 4024 } 4025 } 4026 4027 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4028 } 4029 4030 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4031 // Returns true if all of the source pointed by src has been copied over to 4032 // the destination buffer pointed by buf. Otherwise, returns false. 4033 // Notes: 4034 // 1. If the length (buflen) of the destination buffer excluding the 4035 // null terminator character is not long enough for holding the expanded 4036 // pid characters, it also returns false instead of returning the partially 4037 // expanded one. 4038 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4039 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4040 char* buf, size_t buflen) { 4041 const char* p = src; 4042 char* b = buf; 4043 const char* src_end = &src[srclen]; 4044 char* buf_end = &buf[buflen - 1]; 4045 4046 while (p < src_end && b < buf_end) { 4047 if (*p == '%') { 4048 switch (*(++p)) { 4049 case '%': // "%%" ==> "%" 4050 *b++ = *p++; 4051 break; 4052 case 'p': { // "%p" ==> current process id 4053 // buf_end points to the character before the last character so 4054 // that we could write '\0' to the end of the buffer. 4055 size_t buf_sz = buf_end - b + 1; 4056 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4057 4058 // if jio_snprintf fails or the buffer is not long enough to hold 4059 // the expanded pid, returns false. 4060 if (ret < 0 || ret >= (int)buf_sz) { 4061 return false; 4062 } else { 4063 b += ret; 4064 assert(*b == '\0', "fail in copy_expand_pid"); 4065 if (p == src_end && b == buf_end + 1) { 4066 // reach the end of the buffer. 4067 return true; 4068 } 4069 } 4070 p++; 4071 break; 4072 } 4073 default : 4074 *b++ = '%'; 4075 } 4076 } else { 4077 *b++ = *p++; 4078 } 4079 } 4080 *b = '\0'; 4081 return (p == src_end); // return false if not all of the source was copied 4082 }