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 #if defined(AARCH64) 550 { "NearCpool", JDK_Version::undefined(), JDK_Version::jdk(25), JDK_Version::undefined() }, 551 #endif 552 553 #ifdef ASSERT 554 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 555 #endif 556 557 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 558 // These entries will generate build errors. Their purpose is to test the macros. 559 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 560 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 561 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 562 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 563 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 564 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 565 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 566 #endif 567 568 { nullptr, JDK_Version(0), JDK_Version(0) } 569 }; 570 571 // Flags that are aliases for other flags. 572 typedef struct { 573 const char* alias_name; 574 const char* real_name; 575 } AliasedFlag; 576 577 static AliasedFlag const aliased_jvm_flags[] = { 578 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 579 { nullptr, nullptr} 580 }; 581 582 // Return true if "v" is less than "other", where "other" may be "undefined". 583 static bool version_less_than(JDK_Version v, JDK_Version other) { 584 assert(!v.is_undefined(), "must be defined"); 585 if (!other.is_undefined() && v.compare(other) >= 0) { 586 return false; 587 } else { 588 return true; 589 } 590 } 591 592 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 593 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 594 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 595 flag = special_jvm_flags[i]; 596 return true; 597 } 598 } 599 return false; 600 } 601 602 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 603 assert(version != nullptr, "Must provide a version buffer"); 604 SpecialFlag flag; 605 if (lookup_special_flag(flag_name, flag)) { 606 if (!flag.obsolete_in.is_undefined()) { 607 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 608 *version = flag.obsolete_in; 609 // This flag may have been marked for obsoletion in this version, but we may not 610 // have actually removed it yet. Rather than ignoring it as soon as we reach 611 // this version we allow some time for the removal to happen. So if the flag 612 // still actually exists we process it as normal, but issue an adjusted warning. 613 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 614 if (real_flag != nullptr) { 615 char version_str[256]; 616 version->to_string(version_str, sizeof(version_str)); 617 warning("Temporarily processing option %s; support is scheduled for removal in %s", 618 flag_name, version_str); 619 return false; 620 } 621 return true; 622 } 623 } 624 } 625 return false; 626 } 627 628 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 629 assert(version != nullptr, "Must provide a version buffer"); 630 SpecialFlag flag; 631 if (lookup_special_flag(flag_name, flag)) { 632 if (!flag.deprecated_in.is_undefined()) { 633 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 634 version_less_than(JDK_Version::current(), flag.expired_in)) { 635 *version = flag.deprecated_in; 636 return 1; 637 } else { 638 return -1; 639 } 640 } 641 } 642 return 0; 643 } 644 645 const char* Arguments::real_flag_name(const char *flag_name) { 646 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) { 647 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 648 if (strcmp(flag_status.alias_name, flag_name) == 0) { 649 return flag_status.real_name; 650 } 651 } 652 return flag_name; 653 } 654 655 #ifdef ASSERT 656 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 657 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 658 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 659 return true; 660 } 661 } 662 return false; 663 } 664 665 // Verifies the correctness of the entries in the special_jvm_flags table. 666 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 667 // version being earlier than the deprecation version, then a warning is issued 668 // and verification fails - by returning false. If it is detected that the table 669 // is out of date, with respect to the current version, then ideally a warning is 670 // issued but verification does not fail. This allows the VM to operate when the 671 // version is first updated, without needing to update all the impacted flags at 672 // the same time. In practice we can't issue the warning immediately when the version 673 // is updated as it occurs for every test and some tests are not prepared to handle 674 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 675 // if the check_globals flag is true, and in addition allow a grace period and only 676 // check for stale flags when we hit build 25 (which is far enough into the 6 month 677 // release cycle that all flag updates should have been processed, whilst still 678 // leaving time to make the change before RDP2). 679 // We use a gtest to call this, passing true, so that we can detect stale flags before 680 // the end of the release cycle. 681 682 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 683 684 bool Arguments::verify_special_jvm_flags(bool check_globals) { 685 bool success = true; 686 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 687 const SpecialFlag& flag = special_jvm_flags[i]; 688 if (lookup_special_flag(flag.name, i)) { 689 warning("Duplicate special flag declaration \"%s\"", flag.name); 690 success = false; 691 } 692 if (flag.deprecated_in.is_undefined() && 693 flag.obsolete_in.is_undefined()) { 694 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 695 success = false; 696 } 697 698 if (!flag.deprecated_in.is_undefined()) { 699 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 700 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 701 success = false; 702 } 703 704 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 705 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 706 success = false; 707 } 708 } 709 710 if (!flag.obsolete_in.is_undefined()) { 711 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 712 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 713 success = false; 714 } 715 716 // if flag has become obsolete it should not have a "globals" flag defined anymore. 717 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 718 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 719 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 720 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 721 success = false; 722 } 723 } 724 725 } else if (!flag.expired_in.is_undefined()) { 726 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 727 success = false; 728 } 729 730 if (!flag.expired_in.is_undefined()) { 731 // if flag has become expired it should not have a "globals" flag defined anymore. 732 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 733 !version_less_than(JDK_Version::current(), flag.expired_in)) { 734 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 735 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 736 success = false; 737 } 738 } 739 } 740 } 741 return success; 742 } 743 #endif 744 745 bool Arguments::atojulong(const char *s, julong* result) { 746 return parse_integer(s, result); 747 } 748 749 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 750 if (size < min_size) return arg_too_small; 751 if (size > max_size) return arg_too_big; 752 return arg_in_range; 753 } 754 755 // Describe an argument out of range error 756 void Arguments::describe_range_error(ArgsRange errcode) { 757 switch(errcode) { 758 case arg_too_big: 759 jio_fprintf(defaultStream::error_stream(), 760 "The specified size exceeds the maximum " 761 "representable size.\n"); 762 break; 763 case arg_too_small: 764 case arg_unreadable: 765 case arg_in_range: 766 // do nothing for now 767 break; 768 default: 769 ShouldNotReachHere(); 770 } 771 } 772 773 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 774 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 775 return true; 776 } else { 777 return false; 778 } 779 } 780 781 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 782 // strtod allows leading whitespace, but our flag format does not. 783 if (*value == '\0' || isspace((unsigned char) *value)) { 784 return false; 785 } 786 char* end; 787 errno = 0; 788 double v = strtod(value, &end); 789 if ((errno != 0) || (*end != 0)) { 790 return false; 791 } 792 if (g_isnan(v) || !g_isfinite(v)) { 793 // Currently we cannot handle these special values. 794 return false; 795 } 796 797 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 798 return true; 799 } 800 return false; 801 } 802 803 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 804 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 805 806 if (flag->is_int()) { 807 int v; 808 if (parse_integer(value, &v)) { 809 result = JVMFlagAccess::set_int(flag, &v, origin); 810 } 811 } else if (flag->is_uint()) { 812 uint v; 813 if (parse_integer(value, &v)) { 814 result = JVMFlagAccess::set_uint(flag, &v, origin); 815 } 816 } else if (flag->is_intx()) { 817 intx v; 818 if (parse_integer(value, &v)) { 819 result = JVMFlagAccess::set_intx(flag, &v, origin); 820 } 821 } else if (flag->is_uintx()) { 822 uintx v; 823 if (parse_integer(value, &v)) { 824 result = JVMFlagAccess::set_uintx(flag, &v, origin); 825 } 826 } else if (flag->is_uint64_t()) { 827 uint64_t v; 828 if (parse_integer(value, &v)) { 829 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 830 } 831 } else if (flag->is_size_t()) { 832 size_t v; 833 if (parse_integer(value, &v)) { 834 result = JVMFlagAccess::set_size_t(flag, &v, origin); 835 } 836 } 837 838 return result == JVMFlag::SUCCESS; 839 } 840 841 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 842 if (value[0] == '\0') { 843 value = nullptr; 844 } 845 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 846 // Contract: JVMFlag always returns a pointer that needs freeing. 847 FREE_C_HEAP_ARRAY(char, value); 848 return true; 849 } 850 851 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 852 const char* old_value = ""; 853 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 854 size_t old_len = old_value != nullptr ? strlen(old_value) : 0; 855 size_t new_len = strlen(new_value); 856 const char* value; 857 char* free_this_too = nullptr; 858 if (old_len == 0) { 859 value = new_value; 860 } else if (new_len == 0) { 861 value = old_value; 862 } else { 863 size_t length = old_len + 1 + new_len + 1; 864 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 865 // each new setting adds another LINE to the switch: 866 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 867 value = buf; 868 free_this_too = buf; 869 } 870 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 871 // JVMFlag always returns a pointer that needs freeing. 872 FREE_C_HEAP_ARRAY(char, value); 873 // JVMFlag made its own copy, so I must delete my own temp. buffer. 874 FREE_C_HEAP_ARRAY(char, free_this_too); 875 return true; 876 } 877 878 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 879 const char* real_name = real_flag_name(arg); 880 JDK_Version since = JDK_Version(); 881 switch (is_deprecated_flag(arg, &since)) { 882 case -1: { 883 // Obsolete or expired, so don't process normally, 884 // but allow for an obsolete flag we're still 885 // temporarily allowing. 886 if (!is_obsolete_flag(arg, &since)) { 887 return real_name; 888 } 889 // Note if we're not considered obsolete then we can't be expired either 890 // as obsoletion must come first. 891 return nullptr; 892 } 893 case 0: 894 return real_name; 895 case 1: { 896 char version[256]; 897 since.to_string(version, sizeof(version)); 898 if (real_name != arg) { 899 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 900 arg, version, real_name); 901 } else { 902 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 903 arg, version); 904 } 905 return real_name; 906 } 907 } 908 ShouldNotReachHere(); 909 return nullptr; 910 } 911 912 #define BUFLEN 255 913 914 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 915 char name_copied[BUFLEN+1]; 916 if (name[name_length] != 0) { 917 if (name_length > BUFLEN) { 918 return nullptr; 919 } else { 920 strncpy(name_copied, name, name_length); 921 name_copied[name_length] = '\0'; 922 name = name_copied; 923 } 924 } 925 926 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 927 if (real_name == nullptr) { 928 return nullptr; 929 } 930 JVMFlag* flag = JVMFlag::find_flag(real_name); 931 return flag; 932 } 933 934 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 935 bool is_bool = false; 936 bool bool_val = false; 937 char c = *arg; 938 if (c == '+' || c == '-') { 939 is_bool = true; 940 bool_val = (c == '+'); 941 arg++; 942 } 943 944 const char* name = arg; 945 while (true) { 946 c = *arg; 947 if (isalnum(c) || (c == '_')) { 948 ++arg; 949 } else { 950 break; 951 } 952 } 953 954 size_t name_len = size_t(arg - name); 955 if (name_len == 0) { 956 return false; 957 } 958 959 JVMFlag* flag = find_jvm_flag(name, name_len); 960 if (flag == nullptr) { 961 return false; 962 } 963 964 if (is_bool) { 965 if (*arg != 0) { 966 // Error -- extra characters such as -XX:+BoolFlag=123 967 return false; 968 } 969 return set_bool_flag(flag, bool_val, origin); 970 } 971 972 if (arg[0] == '=') { 973 const char* value = arg + 1; 974 if (flag->is_ccstr()) { 975 if (flag->ccstr_accumulates()) { 976 return append_to_string_flag(flag, value, origin); 977 } else { 978 return set_string_flag(flag, value, origin); 979 } 980 } else if (flag->is_double()) { 981 return set_fp_numeric_flag(flag, value, origin); 982 } else { 983 return set_numeric_flag(flag, value, origin); 984 } 985 } 986 987 if (arg[0] == ':' && arg[1] == '=') { 988 // -XX:Foo:=xxx will reset the string flag to the given value. 989 const char* value = arg + 2; 990 return set_string_flag(flag, value, origin); 991 } 992 993 return false; 994 } 995 996 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 997 assert(bldarray != nullptr, "illegal argument"); 998 999 if (arg == nullptr) { 1000 return; 1001 } 1002 1003 int new_count = *count + 1; 1004 1005 // expand the array and add arg to the last element 1006 if (*bldarray == nullptr) { 1007 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1008 } else { 1009 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1010 } 1011 (*bldarray)[*count] = os::strdup_check_oom(arg); 1012 *count = new_count; 1013 } 1014 1015 void Arguments::build_jvm_args(const char* arg) { 1016 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1017 } 1018 1019 void Arguments::build_jvm_flags(const char* arg) { 1020 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1021 } 1022 1023 // utility function to return a string that concatenates all 1024 // strings in a given char** array 1025 const char* Arguments::build_resource_string(char** args, int count) { 1026 if (args == nullptr || count == 0) { 1027 return nullptr; 1028 } 1029 size_t length = 0; 1030 for (int i = 0; i < count; i++) { 1031 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character 1032 } 1033 char* s = NEW_RESOURCE_ARRAY(char, length); 1034 char* dst = s; 1035 for (int j = 0; j < count; j++) { 1036 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character 1037 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character 1038 dst += offset; 1039 length -= offset; 1040 } 1041 return (const char*) s; 1042 } 1043 1044 void Arguments::print_on(outputStream* st) { 1045 st->print_cr("VM Arguments:"); 1046 if (num_jvm_flags() > 0) { 1047 st->print("jvm_flags: "); print_jvm_flags_on(st); 1048 st->cr(); 1049 } 1050 if (num_jvm_args() > 0) { 1051 st->print("jvm_args: "); print_jvm_args_on(st); 1052 st->cr(); 1053 } 1054 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1055 if (_java_class_path != nullptr) { 1056 char* path = _java_class_path->value(); 1057 size_t len = strlen(path); 1058 st->print("java_class_path (initial): "); 1059 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1060 if (len == 0) { 1061 st->print_raw_cr("<not set>"); 1062 } else { 1063 st->print_raw_cr(path, len); 1064 } 1065 } 1066 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1067 } 1068 1069 void Arguments::print_summary_on(outputStream* st) { 1070 // Print the command line. Environment variables that are helpful for 1071 // reproducing the problem are written later in the hs_err file. 1072 // flags are from setting file 1073 if (num_jvm_flags() > 0) { 1074 st->print_raw("Settings File: "); 1075 print_jvm_flags_on(st); 1076 st->cr(); 1077 } 1078 // args are the command line and environment variable arguments. 1079 st->print_raw("Command Line: "); 1080 if (num_jvm_args() > 0) { 1081 print_jvm_args_on(st); 1082 } 1083 // this is the classfile and any arguments to the java program 1084 if (java_command() != nullptr) { 1085 st->print("%s", java_command()); 1086 } 1087 st->cr(); 1088 } 1089 1090 void Arguments::print_jvm_flags_on(outputStream* st) { 1091 if (_num_jvm_flags > 0) { 1092 for (int i=0; i < _num_jvm_flags; i++) { 1093 st->print("%s ", _jvm_flags_array[i]); 1094 } 1095 } 1096 } 1097 1098 void Arguments::print_jvm_args_on(outputStream* st) { 1099 if (_num_jvm_args > 0) { 1100 for (int i=0; i < _num_jvm_args; i++) { 1101 st->print("%s ", _jvm_args_array[i]); 1102 } 1103 } 1104 } 1105 1106 bool Arguments::process_argument(const char* arg, 1107 jboolean ignore_unrecognized, 1108 JVMFlagOrigin origin) { 1109 JDK_Version since = JDK_Version(); 1110 1111 if (parse_argument(arg, origin)) { 1112 return true; 1113 } 1114 1115 // Determine if the flag has '+', '-', or '=' characters. 1116 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1117 const char* const argname = has_plus_minus ? arg + 1 : arg; 1118 1119 size_t arg_len; 1120 const char* equal_sign = strchr(argname, '='); 1121 if (equal_sign == nullptr) { 1122 arg_len = strlen(argname); 1123 } else { 1124 arg_len = equal_sign - argname; 1125 } 1126 1127 // Only make the obsolete check for valid arguments. 1128 if (arg_len <= BUFLEN) { 1129 // Construct a string which consists only of the argument name without '+', '-', or '='. 1130 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1131 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1132 if (is_obsolete_flag(stripped_argname, &since)) { 1133 char version[256]; 1134 since.to_string(version, sizeof(version)); 1135 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1136 return true; 1137 } 1138 } 1139 1140 // For locked flags, report a custom error message if available. 1141 // Otherwise, report the standard unrecognized VM option. 1142 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1143 if (found_flag != nullptr) { 1144 char locked_message_buf[BUFLEN]; 1145 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1146 if (strlen(locked_message_buf) != 0) { 1147 #ifdef PRODUCT 1148 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD; 1149 if (ignore_unrecognized && mismatched) { 1150 return true; 1151 } 1152 #endif 1153 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1154 } 1155 if (found_flag->is_bool() && !has_plus_minus) { 1156 jio_fprintf(defaultStream::error_stream(), 1157 "Missing +/- setting for VM option '%s'\n", argname); 1158 } else if (!found_flag->is_bool() && has_plus_minus) { 1159 jio_fprintf(defaultStream::error_stream(), 1160 "Unexpected +/- setting in VM option '%s'\n", argname); 1161 } else { 1162 jio_fprintf(defaultStream::error_stream(), 1163 "Improperly specified VM option '%s'\n", argname); 1164 } 1165 } else { 1166 if (ignore_unrecognized) { 1167 return true; 1168 } 1169 jio_fprintf(defaultStream::error_stream(), 1170 "Unrecognized VM option '%s'\n", argname); 1171 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1172 if (fuzzy_matched != nullptr) { 1173 jio_fprintf(defaultStream::error_stream(), 1174 "Did you mean '%s%s%s'?\n", 1175 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1176 fuzzy_matched->name(), 1177 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1178 } 1179 } 1180 1181 // allow for commandline "commenting out" options like -XX:#+Verbose 1182 return arg[0] == '#'; 1183 } 1184 1185 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1186 FILE* stream = os::fopen(file_name, "rb"); 1187 if (stream == nullptr) { 1188 if (should_exist) { 1189 jio_fprintf(defaultStream::error_stream(), 1190 "Could not open settings file %s\n", file_name); 1191 return false; 1192 } else { 1193 return true; 1194 } 1195 } 1196 1197 char token[1024]; 1198 int pos = 0; 1199 1200 bool in_white_space = true; 1201 bool in_comment = false; 1202 bool in_quote = false; 1203 int quote_c = 0; 1204 bool result = true; 1205 1206 int c = getc(stream); 1207 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1208 if (in_white_space) { 1209 if (in_comment) { 1210 if (c == '\n') in_comment = false; 1211 } else { 1212 if (c == '#') in_comment = true; 1213 else if (!isspace((unsigned char) c)) { 1214 in_white_space = false; 1215 token[pos++] = checked_cast<char>(c); 1216 } 1217 } 1218 } else { 1219 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) { 1220 // token ends at newline, or at unquoted whitespace 1221 // this allows a way to include spaces in string-valued options 1222 token[pos] = '\0'; 1223 logOption(token); 1224 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1225 build_jvm_flags(token); 1226 pos = 0; 1227 in_white_space = true; 1228 in_quote = false; 1229 } else if (!in_quote && (c == '\'' || c == '"')) { 1230 in_quote = true; 1231 quote_c = c; 1232 } else if (in_quote && (c == quote_c)) { 1233 in_quote = false; 1234 } else { 1235 token[pos++] = checked_cast<char>(c); 1236 } 1237 } 1238 c = getc(stream); 1239 } 1240 if (pos > 0) { 1241 token[pos] = '\0'; 1242 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1243 build_jvm_flags(token); 1244 } 1245 fclose(stream); 1246 return result; 1247 } 1248 1249 //============================================================================================================= 1250 // Parsing of properties (-D) 1251 1252 const char* Arguments::get_property(const char* key) { 1253 return PropertyList_get_value(system_properties(), key); 1254 } 1255 1256 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1257 const char* eq = strchr(prop, '='); 1258 const char* key; 1259 const char* value = ""; 1260 1261 if (eq == nullptr) { 1262 // property doesn't have a value, thus use passed string 1263 key = prop; 1264 } else { 1265 // property have a value, thus extract it and save to the 1266 // allocated string 1267 size_t key_len = eq - prop; 1268 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1269 1270 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1271 key = tmp_key; 1272 1273 value = &prop[key_len + 1]; 1274 } 1275 1276 if (internal == ExternalProperty) { 1277 CDSConfig::check_incompatible_property(key, value); 1278 } 1279 1280 if (strcmp(key, "java.compiler") == 0) { 1281 // we no longer support java.compiler system property, log a warning and let it get 1282 // passed to Java, like any other system property 1283 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) { 1284 // for applications using NONE or empty value, log a more informative message 1285 warning("The java.compiler system property is obsolete and no longer supported, use -Xint"); 1286 } else { 1287 warning("The java.compiler system property is obsolete and no longer supported."); 1288 } 1289 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1290 // append is true, writable is true, internal is false 1291 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1292 WriteableProperty, ExternalProperty); 1293 } else { 1294 if (strcmp(key, "sun.java.command") == 0) { 1295 char *old_java_command = _java_command; 1296 _java_command = os::strdup_check_oom(value, mtArguments); 1297 if (old_java_command != nullptr) { 1298 os::free(old_java_command); 1299 } 1300 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1301 // If this property is set on the command line then its value will be 1302 // displayed in VM error logs as the URL at which to submit such logs. 1303 // Normally the URL displayed in error logs is different from the value 1304 // of this system property, so a different property should have been 1305 // used here, but we leave this as-is in case someone depends upon it. 1306 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1307 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1308 // its value without going through the property list or making a Java call. 1309 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1310 if (old_java_vendor_url_bug != nullptr) { 1311 os::free((void *)old_java_vendor_url_bug); 1312 } 1313 } 1314 1315 // Create new property and add at the end of the list 1316 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1317 } 1318 1319 if (key != prop) { 1320 // SystemProperty copy passed value, thus free previously allocated 1321 // memory 1322 FreeHeap((void *)key); 1323 } 1324 1325 return true; 1326 } 1327 1328 //=========================================================================================================== 1329 // Setting int/mixed/comp mode flags 1330 1331 void Arguments::set_mode_flags(Mode mode) { 1332 // Set up default values for all flags. 1333 // If you add a flag to any of the branches below, 1334 // add a default value for it here. 1335 _mode = mode; 1336 1337 // Ensure Agent_OnLoad has the correct initial values. 1338 // This may not be the final mode; mode may change later in onload phase. 1339 PropertyList_unique_add(&_system_properties, "java.vm.info", 1340 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1341 1342 UseInterpreter = true; 1343 UseCompiler = true; 1344 UseLoopCounter = true; 1345 1346 // Default values may be platform/compiler dependent - 1347 // use the saved values 1348 ClipInlining = Arguments::_ClipInlining; 1349 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1350 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1351 BackgroundCompilation = Arguments::_BackgroundCompilation; 1352 1353 // Change from defaults based on mode 1354 switch (mode) { 1355 default: 1356 ShouldNotReachHere(); 1357 break; 1358 case _int: 1359 UseCompiler = false; 1360 UseLoopCounter = false; 1361 AlwaysCompileLoopMethods = false; 1362 UseOnStackReplacement = false; 1363 break; 1364 case _mixed: 1365 // same as default 1366 break; 1367 case _comp: 1368 UseInterpreter = false; 1369 BackgroundCompilation = false; 1370 ClipInlining = false; 1371 break; 1372 } 1373 } 1374 1375 // Conflict: required to use shared spaces (-Xshare:on), but 1376 // incompatible command line options were chosen. 1377 void Arguments::no_shared_spaces(const char* message) { 1378 if (RequireSharedSpaces) { 1379 aot_log_error(aot)("%s is incompatible with other specified options.", 1380 CDSConfig::new_aot_flags_used() ? "AOT cache" : "CDS"); 1381 if (CDSConfig::new_aot_flags_used()) { 1382 vm_exit_during_initialization("Unable to use AOT cache", message); 1383 } else { 1384 vm_exit_during_initialization("Unable to use shared archive", message); 1385 } 1386 } else { 1387 if (CDSConfig::new_aot_flags_used()) { 1388 log_warning(aot)("Unable to use AOT cache: %s", message); 1389 } else { 1390 aot_log_info(aot)("Unable to use shared archive: %s", message); 1391 } 1392 UseSharedSpaces = false; 1393 } 1394 } 1395 1396 static void set_object_alignment() { 1397 // Object alignment. 1398 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1399 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1400 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1401 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1402 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1403 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1404 1405 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1406 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1407 1408 // Oop encoding heap max 1409 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1410 } 1411 1412 size_t Arguments::max_heap_for_compressed_oops() { 1413 // Avoid sign flip. 1414 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1415 // We need to fit both the null page and the heap into the memory budget, while 1416 // keeping alignment constraints of the heap. To guarantee the latter, as the 1417 // null page is located before the heap, we pad the null page to the conservative 1418 // maximum alignment that the GC may ever impose upon the heap. 1419 size_t displacement_due_to_null_page = align_up(os::vm_page_size(), 1420 _conservative_max_heap_alignment); 1421 1422 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1423 NOT_LP64(ShouldNotReachHere(); return 0); 1424 } 1425 1426 void Arguments::set_use_compressed_oops() { 1427 #ifdef _LP64 1428 // MaxHeapSize is not set up properly at this point, but 1429 // the only value that can override MaxHeapSize if we are 1430 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1431 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1432 1433 if (max_heap_size <= max_heap_for_compressed_oops()) { 1434 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1435 FLAG_SET_ERGO(UseCompressedOops, true); 1436 } 1437 } else { 1438 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1439 warning("Max heap size too large for Compressed Oops"); 1440 FLAG_SET_DEFAULT(UseCompressedOops, false); 1441 } 1442 } 1443 #endif // _LP64 1444 } 1445 1446 void Arguments::set_conservative_max_heap_alignment() { 1447 // The conservative maximum required alignment for the heap is the maximum of 1448 // the alignments imposed by several sources: any requirements from the heap 1449 // itself and the maximum page size we may run the VM with. 1450 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1451 _conservative_max_heap_alignment = MAX4(heap_alignment, 1452 os::vm_allocation_granularity(), 1453 os::max_page_size(), 1454 GCArguments::compute_heap_alignment()); 1455 } 1456 1457 jint Arguments::set_ergonomics_flags() { 1458 GCConfig::initialize(); 1459 1460 set_conservative_max_heap_alignment(); 1461 1462 #ifdef _LP64 1463 set_use_compressed_oops(); 1464 1465 // Also checks that certain machines are slower with compressed oops 1466 // in vm_version initialization code. 1467 #endif // _LP64 1468 1469 return JNI_OK; 1470 } 1471 1472 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1473 size_t max_allocatable; 1474 size_t result = limit; 1475 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1476 // The AggressiveHeap check is a temporary workaround to avoid calling 1477 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1478 // selected. This works because AggressiveHeap implies UseParallelGC 1479 // where we know the ratio will be 1. Once the AggressiveHeap option is 1480 // removed, this can be cleaned up. 1481 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1482 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1483 result = MIN2(result, max_allocatable / fraction); 1484 } 1485 return result; 1486 } 1487 1488 // Use static initialization to get the default before parsing 1489 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1490 1491 void Arguments::set_heap_size() { 1492 julong phys_mem; 1493 1494 // If the user specified one of these options, they 1495 // want specific memory sizing so do not limit memory 1496 // based on compressed oops addressability. 1497 // Also, memory limits will be calculated based on 1498 // available os physical memory, not our MaxRAM limit, 1499 // unless MaxRAM is also specified. 1500 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1501 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1502 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1503 !FLAG_IS_DEFAULT(MaxRAM)); 1504 if (override_coop_limit) { 1505 if (FLAG_IS_DEFAULT(MaxRAM)) { 1506 phys_mem = os::physical_memory(); 1507 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1508 } else { 1509 phys_mem = (julong)MaxRAM; 1510 } 1511 } else { 1512 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1513 : (julong)MaxRAM; 1514 } 1515 1516 // If the maximum heap size has not been set with -Xmx, 1517 // then set it as fraction of the size of physical memory, 1518 // respecting the maximum and minimum sizes of the heap. 1519 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1520 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100); 1521 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100); 1522 if (reasonable_min < MaxHeapSize) { 1523 // Small physical memory, so use a minimum fraction of it for the heap 1524 reasonable_max = reasonable_min; 1525 } else { 1526 // Not-small physical memory, so require a heap at least 1527 // as large as MaxHeapSize 1528 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1529 } 1530 1531 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1532 // Limit the heap size to ErgoHeapSizeLimit 1533 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1534 } 1535 1536 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1537 1538 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1539 // An initial heap size was specified on the command line, 1540 // so be sure that the maximum size is consistent. Done 1541 // after call to limit_heap_by_allocatable_memory because that 1542 // method might reduce the allocation size. 1543 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1544 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1545 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1546 } 1547 1548 #ifdef _LP64 1549 if (UseCompressedOops || UseCompressedClassPointers) { 1550 // HeapBaseMinAddress can be greater than default but not less than. 1551 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1552 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1553 // matches compressed oops printing flags 1554 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu" 1555 " (%zuG) which is greater than value given %zu", 1556 DefaultHeapBaseMinAddress, 1557 DefaultHeapBaseMinAddress/G, 1558 HeapBaseMinAddress); 1559 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1560 } 1561 } 1562 } 1563 if (UseCompressedOops) { 1564 // Limit the heap size to the maximum possible when using compressed oops 1565 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1566 1567 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1568 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1569 // but it should be not less than default MaxHeapSize. 1570 max_coop_heap -= HeapBaseMinAddress; 1571 } 1572 1573 // If user specified flags prioritizing os physical 1574 // memory limits, then disable compressed oops if 1575 // limits exceed max_coop_heap and UseCompressedOops 1576 // was not specified. 1577 if (reasonable_max > max_coop_heap) { 1578 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1579 aot_log_info(aot)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1580 " max heap %zu > compressed oop heap %zu. " 1581 "Please check the setting of MaxRAMPercentage %5.2f." 1582 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1583 FLAG_SET_ERGO(UseCompressedOops, false); 1584 } else { 1585 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1586 } 1587 } 1588 } 1589 #endif // _LP64 1590 1591 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max); 1592 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1593 } 1594 1595 // If the minimum or initial heap_size have not been set or requested to be set 1596 // ergonomically, set them accordingly. 1597 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1598 julong reasonable_minimum = (julong)(OldSize + NewSize); 1599 1600 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1601 1602 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1603 1604 if (InitialHeapSize == 0) { 1605 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100); 1606 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1607 1608 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1609 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1610 1611 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1612 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize); 1613 } 1614 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1615 // synchronize with InitialHeapSize to avoid errors with the default value. 1616 if (MinHeapSize == 0) { 1617 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1618 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize); 1619 } 1620 } 1621 } 1622 1623 // This option inspects the machine and attempts to set various 1624 // parameters to be optimal for long-running, memory allocation 1625 // intensive jobs. It is intended for machines with large 1626 // amounts of cpu and memory. 1627 jint Arguments::set_aggressive_heap_flags() { 1628 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1629 // VM, but we may not be able to represent the total physical memory 1630 // available (like having 8gb of memory on a box but using a 32bit VM). 1631 // Thus, we need to make sure we're using a julong for intermediate 1632 // calculations. 1633 julong initHeapSize; 1634 julong total_memory = os::physical_memory(); 1635 1636 if (total_memory < (julong) 256 * M) { 1637 jio_fprintf(defaultStream::error_stream(), 1638 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1639 vm_exit(1); 1640 } 1641 1642 // The heap size is half of available memory, or (at most) 1643 // all of possible memory less 160mb (leaving room for the OS 1644 // when using ISM). This is the maximum; because adaptive sizing 1645 // is turned on below, the actual space used may be smaller. 1646 1647 initHeapSize = MIN2(total_memory / (julong) 2, 1648 total_memory - (julong) 160 * M); 1649 1650 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1651 1652 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1653 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1654 return JNI_EINVAL; 1655 } 1656 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1657 return JNI_EINVAL; 1658 } 1659 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1660 return JNI_EINVAL; 1661 } 1662 } 1663 if (FLAG_IS_DEFAULT(NewSize)) { 1664 // Make the young generation 3/8ths of the total heap. 1665 if (FLAG_SET_CMDLINE(NewSize, 1666 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1667 return JNI_EINVAL; 1668 } 1669 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1670 return JNI_EINVAL; 1671 } 1672 } 1673 1674 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1675 FLAG_SET_DEFAULT(UseLargePages, true); 1676 #endif 1677 1678 // Increase some data structure sizes for efficiency 1679 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1680 return JNI_EINVAL; 1681 } 1682 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1683 return JNI_EINVAL; 1684 } 1685 1686 // See the OldPLABSize comment below, but replace 'after promotion' 1687 // with 'after copying'. YoungPLABSize is the size of the survivor 1688 // space per-gc-thread buffers. The default is 4kw. 1689 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1690 return JNI_EINVAL; 1691 } 1692 1693 // OldPLABSize is the size of the buffers in the old gen that 1694 // UseParallelGC uses to promote live data that doesn't fit in the 1695 // survivor spaces. At any given time, there's one for each gc thread. 1696 // The default size is 1kw. These buffers are rarely used, since the 1697 // survivor spaces are usually big enough. For specjbb, however, there 1698 // are occasions when there's lots of live data in the young gen 1699 // and we end up promoting some of it. We don't have a definite 1700 // explanation for why bumping OldPLABSize helps, but the theory 1701 // is that a bigger PLAB results in retaining something like the 1702 // original allocation order after promotion, which improves mutator 1703 // locality. A minor effect may be that larger PLABs reduce the 1704 // number of PLAB allocation events during gc. The value of 8kw 1705 // was arrived at by experimenting with specjbb. 1706 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1707 return JNI_EINVAL; 1708 } 1709 1710 // Enable parallel GC and adaptive generation sizing 1711 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1712 return JNI_EINVAL; 1713 } 1714 1715 // Encourage steady state memory management 1716 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1717 return JNI_EINVAL; 1718 } 1719 1720 return JNI_OK; 1721 } 1722 1723 // This must be called after ergonomics. 1724 void Arguments::set_bytecode_flags() { 1725 if (!RewriteBytecodes) { 1726 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1727 } 1728 } 1729 1730 // Aggressive optimization flags 1731 jint Arguments::set_aggressive_opts_flags() { 1732 #ifdef COMPILER2 1733 if (AggressiveUnboxing) { 1734 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1735 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1736 } else if (!EliminateAutoBox) { 1737 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1738 AggressiveUnboxing = false; 1739 } 1740 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1741 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1742 } else if (!DoEscapeAnalysis) { 1743 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1744 AggressiveUnboxing = false; 1745 } 1746 } 1747 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1748 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1749 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1750 } 1751 // Feed the cache size setting into the JDK 1752 char buffer[1024]; 1753 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=%zd", AutoBoxCacheMax); 1754 if (!add_property(buffer)) { 1755 return JNI_ENOMEM; 1756 } 1757 } 1758 #endif 1759 1760 return JNI_OK; 1761 } 1762 1763 //=========================================================================================================== 1764 1765 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1766 if (_sun_java_launcher != _default_java_launcher) { 1767 os::free(const_cast<char*>(_sun_java_launcher)); 1768 } 1769 _sun_java_launcher = os::strdup_check_oom(launcher); 1770 } 1771 1772 bool Arguments::created_by_java_launcher() { 1773 assert(_sun_java_launcher != nullptr, "property must have value"); 1774 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1775 } 1776 1777 bool Arguments::executing_unit_tests() { 1778 return _executing_unit_tests; 1779 } 1780 1781 //=========================================================================================================== 1782 // Parsing of main arguments 1783 1784 static unsigned int addreads_count = 0; 1785 static unsigned int addexports_count = 0; 1786 static unsigned int addopens_count = 0; 1787 static unsigned int patch_mod_count = 0; 1788 static unsigned int enable_native_access_count = 0; 1789 static bool patch_mod_javabase = false; 1790 1791 // Check the consistency of vm_init_args 1792 bool Arguments::check_vm_args_consistency() { 1793 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency() 1794 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) { 1795 return false; 1796 } 1797 1798 // Method for adding checks for flag consistency. 1799 // The intent is to warn the user of all possible conflicts, 1800 // before returning an error. 1801 // Note: Needs platform-dependent factoring. 1802 bool status = true; 1803 1804 if (TLABRefillWasteFraction == 0) { 1805 jio_fprintf(defaultStream::error_stream(), 1806 "TLABRefillWasteFraction should be a denominator, " 1807 "not %zu\n", 1808 TLABRefillWasteFraction); 1809 status = false; 1810 } 1811 1812 status = CompilerConfig::check_args_consistency(status); 1813 #if INCLUDE_JVMCI 1814 if (status && EnableJVMCI) { 1815 // Add the JVMCI module if not using libjvmci or EnableJVMCI 1816 // was explicitly set on the command line or in the jimage. 1817 if ((!UseJVMCINativeLibrary || FLAG_IS_CMDLINE(EnableJVMCI) || FLAG_IS_JIMAGE_RESOURCE(EnableJVMCI)) && ClassLoader::is_module_observable("jdk.internal.vm.ci") && !_jvmci_module_added) { 1818 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) { 1819 return false; 1820 } 1821 } 1822 } 1823 #endif 1824 1825 #if INCLUDE_JFR 1826 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1827 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) { 1828 return false; 1829 } 1830 } 1831 #endif 1832 1833 #ifndef SUPPORT_RESERVED_STACK_AREA 1834 if (StackReservedPages != 0) { 1835 FLAG_SET_CMDLINE(StackReservedPages, 0); 1836 warning("Reserved Stack Area not supported on this platform"); 1837 } 1838 #endif 1839 1840 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) { 1841 // ObjectMonitorTable requires lightweight locking. 1842 FLAG_SET_CMDLINE(UseObjectMonitorTable, false); 1843 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT"); 1844 } 1845 1846 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390) 1847 if (LockingMode == LM_MONITOR) { 1848 jio_fprintf(defaultStream::error_stream(), 1849 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n"); 1850 return false; 1851 } 1852 #endif 1853 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) { 1854 jio_fprintf(defaultStream::error_stream(), 1855 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n"); 1856 return false; 1857 } 1858 return status; 1859 } 1860 1861 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1862 const char* option_type) { 1863 if (ignore) return false; 1864 1865 const char* spacer = " "; 1866 if (option_type == nullptr) { 1867 option_type = ++spacer; // Set both to the empty string. 1868 } 1869 1870 jio_fprintf(defaultStream::error_stream(), 1871 "Unrecognized %s%soption: %s\n", option_type, spacer, 1872 option->optionString); 1873 return true; 1874 } 1875 1876 static const char* user_assertion_options[] = { 1877 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr 1878 }; 1879 1880 static const char* system_assertion_options[] = { 1881 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr 1882 }; 1883 1884 bool Arguments::parse_uint(const char* value, 1885 uint* uint_arg, 1886 uint min_size) { 1887 uint n; 1888 if (!parse_integer(value, &n)) { 1889 return false; 1890 } 1891 if (n >= min_size) { 1892 *uint_arg = n; 1893 return true; 1894 } else { 1895 return false; 1896 } 1897 } 1898 1899 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 1900 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 1901 CDSConfig::check_internal_module_property(prop_name, prop_value); 1902 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 1903 char* property = AllocateHeap(prop_len, mtArguments); 1904 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 1905 if (ret < 0 || ret >= (int)prop_len) { 1906 FreeHeap(property); 1907 return false; 1908 } 1909 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 1910 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 1911 // that multiple occurrences of the associated flag just causes the existing property value to be 1912 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 1913 // to a property after we have finished flag processing. 1914 bool added = add_property(property, WriteableProperty, internal); 1915 FreeHeap(property); 1916 return added; 1917 } 1918 1919 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 1920 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 1921 CDSConfig::check_internal_module_property(prop_base_name, prop_value); 1922 const unsigned int props_count_limit = 1000; 1923 const int max_digits = 3; 1924 const int extra_symbols_count = 3; // includes '.', '=', '\0' 1925 1926 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 1927 if (count < props_count_limit) { 1928 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 1929 char* property = AllocateHeap(prop_len, mtArguments); 1930 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 1931 if (ret < 0 || ret >= (int)prop_len) { 1932 FreeHeap(property); 1933 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 1934 return false; 1935 } 1936 bool added = add_property(property, UnwriteableProperty, InternalProperty); 1937 FreeHeap(property); 1938 return added; 1939 } 1940 1941 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 1942 return false; 1943 } 1944 1945 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1946 julong* long_arg, 1947 julong min_size, 1948 julong max_size) { 1949 if (!parse_integer(s, long_arg)) return arg_unreadable; 1950 return check_memory_size(*long_arg, min_size, max_size); 1951 } 1952 1953 jint Arguments::parse_vm_init_args(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args) { 1954 // Save default settings for some mode flags 1955 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1956 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1957 Arguments::_ClipInlining = ClipInlining; 1958 Arguments::_BackgroundCompilation = BackgroundCompilation; 1959 1960 // Remember the default value of SharedBaseAddress. 1961 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 1962 1963 // Setup flags for mixed which is the default 1964 set_mode_flags(_mixed); 1965 1966 jint result; 1967 for (int i = 0; i < all_args->length(); i++) { 1968 result = parse_each_vm_init_arg(all_args->at(i)._args, all_args->at(i)._origin); 1969 if (result != JNI_OK) { 1970 return result; 1971 } 1972 } 1973 1974 // Disable CDS for exploded image 1975 if (!has_jimage()) { 1976 no_shared_spaces("CDS disabled on exploded JDK"); 1977 } 1978 1979 // We need to ensure processor and memory resources have been properly 1980 // configured - which may rely on arguments we just processed - before 1981 // doing the final argument processing. Any argument processing that 1982 // needs to know about processor and memory resources must occur after 1983 // this point. 1984 1985 os::init_container_support(); 1986 1987 SystemMemoryBarrier::initialize(); 1988 1989 // Do final processing now that all arguments have been parsed 1990 result = finalize_vm_init_args(); 1991 if (result != JNI_OK) { 1992 return result; 1993 } 1994 1995 return JNI_OK; 1996 } 1997 1998 #if !INCLUDE_JVMTI || INCLUDE_CDS 1999 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2000 // represents a valid JDWP agent. is_path==true denotes that we 2001 // are dealing with -agentpath (case where name is a path), otherwise with 2002 // -agentlib 2003 static bool valid_jdwp_agent(char *name, bool is_path) { 2004 char *_name; 2005 const char *_jdwp = "jdwp"; 2006 size_t _len_jdwp, _len_prefix; 2007 2008 if (is_path) { 2009 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) { 2010 return false; 2011 } 2012 2013 _name++; // skip past last path separator 2014 _len_prefix = strlen(JNI_LIB_PREFIX); 2015 2016 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2017 return false; 2018 } 2019 2020 _name += _len_prefix; 2021 _len_jdwp = strlen(_jdwp); 2022 2023 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2024 _name += _len_jdwp; 2025 } 2026 else { 2027 return false; 2028 } 2029 2030 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2031 return false; 2032 } 2033 2034 return true; 2035 } 2036 2037 if (strcmp(name, _jdwp) == 0) { 2038 return true; 2039 } 2040 2041 return false; 2042 } 2043 #endif 2044 2045 int Arguments::process_patch_mod_option(const char* patch_mod_tail) { 2046 // --patch-module=<module>=<file>(<pathsep><file>)* 2047 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value"); 2048 // Find the equal sign between the module name and the path specification 2049 const char* module_equal = strchr(patch_mod_tail, '='); 2050 if (module_equal == nullptr) { 2051 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2052 return JNI_ERR; 2053 } else { 2054 // Pick out the module name 2055 size_t module_len = module_equal - patch_mod_tail; 2056 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2057 if (module_name != nullptr) { 2058 memcpy(module_name, patch_mod_tail, module_len); 2059 *(module_name + module_len) = '\0'; 2060 // The path piece begins one past the module_equal sign 2061 add_patch_mod_prefix(module_name, module_equal + 1); 2062 FREE_C_HEAP_ARRAY(char, module_name); 2063 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2064 return JNI_ENOMEM; 2065 } 2066 } else { 2067 return JNI_ENOMEM; 2068 } 2069 } 2070 return JNI_OK; 2071 } 2072 2073 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2074 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2075 // The min and max sizes match the values in globals.hpp, but scaled 2076 // with K. The values have been chosen so that alignment with page 2077 // size doesn't change the max value, which makes the conversions 2078 // back and forth between Xss value and ThreadStackSize value easier. 2079 // The values have also been chosen to fit inside a 32-bit signed type. 2080 const julong min_ThreadStackSize = 0; 2081 const julong max_ThreadStackSize = 1 * M; 2082 2083 // Make sure the above values match the range set in globals.hpp 2084 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2085 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2086 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2087 2088 const julong min_size = min_ThreadStackSize * K; 2089 const julong max_size = max_ThreadStackSize * K; 2090 2091 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2092 2093 julong size = 0; 2094 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2095 if (errcode != arg_in_range) { 2096 bool silent = (option == nullptr); // Allow testing to silence error messages 2097 if (!silent) { 2098 jio_fprintf(defaultStream::error_stream(), 2099 "Invalid thread stack size: %s\n", option->optionString); 2100 describe_range_error(errcode); 2101 } 2102 return JNI_EINVAL; 2103 } 2104 2105 // Internally track ThreadStackSize in units of 1024 bytes. 2106 const julong size_aligned = align_up(size, K); 2107 assert(size <= size_aligned, 2108 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2109 size, size_aligned); 2110 2111 const julong size_in_K = size_aligned / K; 2112 assert(size_in_K < (julong)max_intx, 2113 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2114 size_in_K); 2115 2116 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2117 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2118 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2119 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2120 max_expanded, size_in_K); 2121 2122 *out_ThreadStackSize = (intx)size_in_K; 2123 2124 return JNI_OK; 2125 } 2126 2127 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) { 2128 // For match_option to return remaining or value part of option string 2129 const char* tail; 2130 2131 // iterate over arguments 2132 for (int index = 0; index < args->nOptions; index++) { 2133 bool is_absolute_path = false; // for -agentpath vs -agentlib 2134 2135 const JavaVMOption* option = args->options + index; 2136 2137 if (!match_option(option, "-Djava.class.path", &tail) && 2138 !match_option(option, "-Dsun.java.command", &tail) && 2139 !match_option(option, "-Dsun.java.launcher", &tail)) { 2140 2141 // add all jvm options to the jvm_args string. This string 2142 // is used later to set the java.vm.args PerfData string constant. 2143 // the -Djava.class.path and the -Dsun.java.command options are 2144 // omitted from jvm_args string as each have their own PerfData 2145 // string constant object. 2146 build_jvm_args(option->optionString); 2147 } 2148 2149 // -verbose:[class/module/gc/jni] 2150 if (match_option(option, "-verbose", &tail)) { 2151 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2152 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2153 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2154 } else if (!strcmp(tail, ":module")) { 2155 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2156 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2157 } else if (!strcmp(tail, ":gc")) { 2158 if (_legacyGCLogging.lastFlag == 0) { 2159 _legacyGCLogging.lastFlag = 1; 2160 } 2161 } else if (!strcmp(tail, ":jni")) { 2162 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2163 } 2164 // -da / -ea / -disableassertions / -enableassertions 2165 // These accept an optional class/package name separated by a colon, e.g., 2166 // -da:java.lang.Thread. 2167 } else if (match_option(option, user_assertion_options, &tail, true)) { 2168 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2169 if (*tail == '\0') { 2170 JavaAssertions::setUserClassDefault(enable); 2171 } else { 2172 assert(*tail == ':', "bogus match by match_option()"); 2173 JavaAssertions::addOption(tail + 1, enable); 2174 } 2175 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2176 } else if (match_option(option, system_assertion_options, &tail, false)) { 2177 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2178 JavaAssertions::setSystemClassDefault(enable); 2179 // -bootclasspath: 2180 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2181 jio_fprintf(defaultStream::output_stream(), 2182 "-Xbootclasspath is no longer a supported option.\n"); 2183 return JNI_EINVAL; 2184 // -bootclasspath/a: 2185 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2186 Arguments::append_sysclasspath(tail); 2187 // -bootclasspath/p: 2188 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2189 jio_fprintf(defaultStream::output_stream(), 2190 "-Xbootclasspath/p is no longer a supported option.\n"); 2191 return JNI_EINVAL; 2192 // -Xrun 2193 } else if (match_option(option, "-Xrun", &tail)) { 2194 if (tail != nullptr) { 2195 const char* pos = strchr(tail, ':'); 2196 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail; 2197 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2198 jio_snprintf(name, len + 1, "%s", tail); 2199 2200 char *options = nullptr; 2201 if(pos != nullptr) { 2202 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2203 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2204 } 2205 #if !INCLUDE_JVMTI 2206 if (strcmp(name, "jdwp") == 0) { 2207 jio_fprintf(defaultStream::error_stream(), 2208 "Debugging agents are not supported in this VM\n"); 2209 return JNI_ERR; 2210 } 2211 #endif // !INCLUDE_JVMTI 2212 JvmtiAgentList::add_xrun(name, options, false); 2213 FREE_C_HEAP_ARRAY(char, name); 2214 FREE_C_HEAP_ARRAY(char, options); 2215 } 2216 } else if (match_option(option, "--add-reads=", &tail)) { 2217 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2218 return JNI_ENOMEM; 2219 } 2220 } else if (match_option(option, "--add-exports=", &tail)) { 2221 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2222 return JNI_ENOMEM; 2223 } 2224 } else if (match_option(option, "--add-opens=", &tail)) { 2225 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2226 return JNI_ENOMEM; 2227 } 2228 } else if (match_option(option, "--add-modules=", &tail)) { 2229 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) { 2230 return JNI_ENOMEM; 2231 } 2232 #if INCLUDE_JVMCI 2233 if (!_jvmci_module_added) { 2234 const char *jvmci_module = strstr(tail, "jdk.internal.vm.ci"); 2235 if (jvmci_module != nullptr) { 2236 char before = *(jvmci_module - 1); 2237 char after = *(jvmci_module + strlen("jdk.internal.vm.ci")); 2238 if ((before == '=' || before == ',') && (after == '\0' || after == ',')) { 2239 FLAG_SET_DEFAULT(EnableJVMCI, true); 2240 _jvmci_module_added = true; 2241 } 2242 } 2243 } 2244 #endif 2245 } else if (match_option(option, "--enable-native-access=", &tail)) { 2246 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2247 return JNI_ENOMEM; 2248 } 2249 } else if (match_option(option, "--illegal-native-access=", &tail)) { 2250 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) { 2251 return JNI_ENOMEM; 2252 } 2253 } else if (match_option(option, "--limit-modules=", &tail)) { 2254 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2255 return JNI_ENOMEM; 2256 } 2257 } else if (match_option(option, "--module-path=", &tail)) { 2258 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2259 return JNI_ENOMEM; 2260 } 2261 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2262 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2263 return JNI_ENOMEM; 2264 } 2265 } else if (match_option(option, "--patch-module=", &tail)) { 2266 // --patch-module=<module>=<file>(<pathsep><file>)* 2267 int res = process_patch_mod_option(tail); 2268 if (res != JNI_OK) { 2269 return res; 2270 } 2271 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) { 2272 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) { 2273 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail, 2274 AddProperty, WriteableProperty, InternalProperty); 2275 } else { 2276 jio_fprintf(defaultStream::error_stream(), 2277 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail); 2278 return JNI_ERR; 2279 } 2280 } else if (match_option(option, "--illegal-access=", &tail)) { 2281 char version[256]; 2282 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2283 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2284 // -agentlib and -agentpath 2285 } else if (match_option(option, "-agentlib:", &tail) || 2286 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2287 if(tail != nullptr) { 2288 const char* pos = strchr(tail, '='); 2289 char* name; 2290 if (pos == nullptr) { 2291 name = os::strdup_check_oom(tail, mtArguments); 2292 } else { 2293 size_t len = pos - tail; 2294 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2295 memcpy(name, tail, len); 2296 name[len] = '\0'; 2297 } 2298 2299 char *options = nullptr; 2300 if(pos != nullptr) { 2301 options = os::strdup_check_oom(pos + 1, mtArguments); 2302 } 2303 #if !INCLUDE_JVMTI 2304 if (valid_jdwp_agent(name, is_absolute_path)) { 2305 jio_fprintf(defaultStream::error_stream(), 2306 "Debugging agents are not supported in this VM\n"); 2307 return JNI_ERR; 2308 } 2309 #elif INCLUDE_CDS 2310 if (valid_jdwp_agent(name, is_absolute_path)) { 2311 _has_jdwp_agent = true; 2312 } 2313 #endif // !INCLUDE_JVMTI 2314 JvmtiAgentList::add(name, options, is_absolute_path); 2315 os::free(name); 2316 os::free(options); 2317 } 2318 // -javaagent 2319 } else if (match_option(option, "-javaagent:", &tail)) { 2320 #if !INCLUDE_JVMTI 2321 jio_fprintf(defaultStream::error_stream(), 2322 "Instrumentation agents are not supported in this VM\n"); 2323 return JNI_ERR; 2324 #else 2325 if (tail != nullptr) { 2326 size_t length = strlen(tail) + 1; 2327 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2328 jio_snprintf(options, length, "%s", tail); 2329 JvmtiAgentList::add("instrument", options, false); 2330 FREE_C_HEAP_ARRAY(char, options); 2331 2332 // java agents need module java.instrument 2333 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) { 2334 return JNI_ENOMEM; 2335 } 2336 } 2337 #endif // !INCLUDE_JVMTI 2338 // --enable_preview 2339 } else if (match_option(option, "--enable-preview")) { 2340 set_enable_preview(); 2341 // -Xnoclassgc 2342 } else if (match_option(option, "-Xnoclassgc")) { 2343 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2344 return JNI_EINVAL; 2345 } 2346 // -Xbatch 2347 } else if (match_option(option, "-Xbatch")) { 2348 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2349 return JNI_EINVAL; 2350 } 2351 // -Xmn for compatibility with other JVM vendors 2352 } else if (match_option(option, "-Xmn", &tail)) { 2353 julong long_initial_young_size = 0; 2354 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2355 if (errcode != arg_in_range) { 2356 jio_fprintf(defaultStream::error_stream(), 2357 "Invalid initial young generation size: %s\n", option->optionString); 2358 describe_range_error(errcode); 2359 return JNI_EINVAL; 2360 } 2361 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2362 return JNI_EINVAL; 2363 } 2364 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2365 return JNI_EINVAL; 2366 } 2367 // -Xms 2368 } else if (match_option(option, "-Xms", &tail)) { 2369 julong size = 0; 2370 // an initial heap size of 0 means automatically determine 2371 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2372 if (errcode != arg_in_range) { 2373 jio_fprintf(defaultStream::error_stream(), 2374 "Invalid initial heap size: %s\n", option->optionString); 2375 describe_range_error(errcode); 2376 return JNI_EINVAL; 2377 } 2378 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2379 return JNI_EINVAL; 2380 } 2381 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2382 return JNI_EINVAL; 2383 } 2384 // -Xmx 2385 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2386 julong long_max_heap_size = 0; 2387 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2388 if (errcode != arg_in_range) { 2389 jio_fprintf(defaultStream::error_stream(), 2390 "Invalid maximum heap size: %s\n", option->optionString); 2391 describe_range_error(errcode); 2392 return JNI_EINVAL; 2393 } 2394 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2395 return JNI_EINVAL; 2396 } 2397 // Xmaxf 2398 } else if (match_option(option, "-Xmaxf", &tail)) { 2399 char* err; 2400 int maxf = (int)(strtod(tail, &err) * 100); 2401 if (*err != '\0' || *tail == '\0') { 2402 jio_fprintf(defaultStream::error_stream(), 2403 "Bad max heap free percentage size: %s\n", 2404 option->optionString); 2405 return JNI_EINVAL; 2406 } else { 2407 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2408 return JNI_EINVAL; 2409 } 2410 } 2411 // Xminf 2412 } else if (match_option(option, "-Xminf", &tail)) { 2413 char* err; 2414 int minf = (int)(strtod(tail, &err) * 100); 2415 if (*err != '\0' || *tail == '\0') { 2416 jio_fprintf(defaultStream::error_stream(), 2417 "Bad min heap free percentage size: %s\n", 2418 option->optionString); 2419 return JNI_EINVAL; 2420 } else { 2421 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2422 return JNI_EINVAL; 2423 } 2424 } 2425 // -Xss 2426 } else if (match_option(option, "-Xss", &tail)) { 2427 intx value = 0; 2428 jint err = parse_xss(option, tail, &value); 2429 if (err != JNI_OK) { 2430 return err; 2431 } 2432 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2433 return JNI_EINVAL; 2434 } 2435 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2436 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2437 julong long_ReservedCodeCacheSize = 0; 2438 2439 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2440 if (errcode != arg_in_range) { 2441 jio_fprintf(defaultStream::error_stream(), 2442 "Invalid maximum code cache size: %s.\n", option->optionString); 2443 return JNI_EINVAL; 2444 } 2445 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (size_t)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2446 return JNI_EINVAL; 2447 } 2448 // -green 2449 } else if (match_option(option, "-green")) { 2450 jio_fprintf(defaultStream::error_stream(), 2451 "Green threads support not available\n"); 2452 return JNI_EINVAL; 2453 // -native 2454 } else if (match_option(option, "-native")) { 2455 // HotSpot always uses native threads, ignore silently for compatibility 2456 // -Xrs 2457 } else if (match_option(option, "-Xrs")) { 2458 // Classic/EVM option, new functionality 2459 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2460 return JNI_EINVAL; 2461 } 2462 // -Xprof 2463 } else if (match_option(option, "-Xprof")) { 2464 char version[256]; 2465 // Obsolete in JDK 10 2466 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2467 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2468 // -Xinternalversion 2469 } else if (match_option(option, "-Xinternalversion")) { 2470 jio_fprintf(defaultStream::output_stream(), "%s\n", 2471 VM_Version::internal_vm_info_string()); 2472 vm_exit(0); 2473 #ifndef PRODUCT 2474 // -Xprintflags 2475 } else if (match_option(option, "-Xprintflags")) { 2476 JVMFlag::printFlags(tty, false); 2477 vm_exit(0); 2478 #endif 2479 // -D 2480 } else if (match_option(option, "-D", &tail)) { 2481 const char* value; 2482 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2483 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2484 // abort if -Djava.endorsed.dirs is set 2485 jio_fprintf(defaultStream::output_stream(), 2486 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2487 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2488 return JNI_EINVAL; 2489 } 2490 if (match_option(option, "-Djava.ext.dirs=", &value) && 2491 *value != '\0' && strcmp(value, "\"\"") != 0) { 2492 // abort if -Djava.ext.dirs is set 2493 jio_fprintf(defaultStream::output_stream(), 2494 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2495 return JNI_EINVAL; 2496 } 2497 // Check for module related properties. They must be set using the modules 2498 // options. For example: use "--add-modules=java.sql", not 2499 // "-Djdk.module.addmods=java.sql" 2500 if (is_internal_module_property(option->optionString + 2)) { 2501 needs_module_property_warning = true; 2502 continue; 2503 } 2504 if (!add_property(tail)) { 2505 return JNI_ENOMEM; 2506 } 2507 // Out of the box management support 2508 if (match_option(option, "-Dcom.sun.management", &tail)) { 2509 #if INCLUDE_MANAGEMENT 2510 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2511 return JNI_EINVAL; 2512 } 2513 // management agent in module jdk.management.agent 2514 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) { 2515 return JNI_ENOMEM; 2516 } 2517 #else 2518 jio_fprintf(defaultStream::output_stream(), 2519 "-Dcom.sun.management is not supported in this VM.\n"); 2520 return JNI_ERR; 2521 #endif 2522 } 2523 // -Xint 2524 } else if (match_option(option, "-Xint")) { 2525 set_mode_flags(_int); 2526 mode_flag_cmd_line = true; 2527 // -Xmixed 2528 } else if (match_option(option, "-Xmixed")) { 2529 set_mode_flags(_mixed); 2530 mode_flag_cmd_line = true; 2531 // -Xcomp 2532 } else if (match_option(option, "-Xcomp")) { 2533 // for testing the compiler; turn off all flags that inhibit compilation 2534 set_mode_flags(_comp); 2535 mode_flag_cmd_line = true; 2536 // -Xshare:dump 2537 } else if (match_option(option, "-Xshare:dump")) { 2538 CDSConfig::enable_dumping_static_archive(); 2539 CDSConfig::set_old_cds_flags_used(); 2540 // -Xshare:on 2541 } else if (match_option(option, "-Xshare:on")) { 2542 UseSharedSpaces = true; 2543 RequireSharedSpaces = true; 2544 CDSConfig::set_old_cds_flags_used(); 2545 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2546 } else if (match_option(option, "-Xshare:auto")) { 2547 UseSharedSpaces = true; 2548 RequireSharedSpaces = false; 2549 xshare_auto_cmd_line = true; 2550 CDSConfig::set_old_cds_flags_used(); 2551 // -Xshare:off 2552 } else if (match_option(option, "-Xshare:off")) { 2553 UseSharedSpaces = false; 2554 RequireSharedSpaces = false; 2555 CDSConfig::set_old_cds_flags_used(); 2556 // -Xverify 2557 } else if (match_option(option, "-Xverify", &tail)) { 2558 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2559 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2560 return JNI_EINVAL; 2561 } 2562 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2563 return JNI_EINVAL; 2564 } 2565 } else if (strcmp(tail, ":remote") == 0) { 2566 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2567 return JNI_EINVAL; 2568 } 2569 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2570 return JNI_EINVAL; 2571 } 2572 } else if (strcmp(tail, ":none") == 0) { 2573 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2574 return JNI_EINVAL; 2575 } 2576 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2577 return JNI_EINVAL; 2578 } 2579 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2580 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2581 return JNI_EINVAL; 2582 } 2583 // -Xdebug 2584 } else if (match_option(option, "-Xdebug")) { 2585 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release."); 2586 } else if (match_option(option, "-Xloggc:", &tail)) { 2587 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2588 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2589 _legacyGCLogging.lastFlag = 2; 2590 _legacyGCLogging.file = os::strdup_check_oom(tail); 2591 } else if (match_option(option, "-Xlog", &tail)) { 2592 bool ret = false; 2593 if (strcmp(tail, ":help") == 0) { 2594 fileStream stream(defaultStream::output_stream()); 2595 LogConfiguration::print_command_line_help(&stream); 2596 vm_exit(0); 2597 } else if (strcmp(tail, ":disable") == 0) { 2598 LogConfiguration::disable_logging(); 2599 ret = true; 2600 } else if (strncmp(tail, ":async", strlen(":async")) == 0) { 2601 const char* async_tail = tail + strlen(":async"); 2602 ret = LogConfiguration::parse_async_argument(async_tail); 2603 } else if (*tail == '\0') { 2604 ret = LogConfiguration::parse_command_line_arguments(); 2605 assert(ret, "-Xlog without arguments should never fail to parse"); 2606 } else if (*tail == ':') { 2607 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2608 } 2609 if (ret == false) { 2610 jio_fprintf(defaultStream::error_stream(), 2611 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2612 tail); 2613 return JNI_EINVAL; 2614 } 2615 // JNI hooks 2616 } else if (match_option(option, "-Xcheck", &tail)) { 2617 if (!strcmp(tail, ":jni")) { 2618 #if !INCLUDE_JNI_CHECK 2619 warning("JNI CHECKING is not supported in this VM"); 2620 #else 2621 CheckJNICalls = true; 2622 #endif // INCLUDE_JNI_CHECK 2623 } else if (is_bad_option(option, args->ignoreUnrecognized, 2624 "check")) { 2625 return JNI_EINVAL; 2626 } 2627 } else if (match_option(option, "vfprintf")) { 2628 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2629 } else if (match_option(option, "exit")) { 2630 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2631 } else if (match_option(option, "abort")) { 2632 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2633 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2634 // and the last option wins. 2635 } else if (match_option(option, "-XX:+NeverTenure")) { 2636 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2637 return JNI_EINVAL; 2638 } 2639 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2640 return JNI_EINVAL; 2641 } 2642 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2643 return JNI_EINVAL; 2644 } 2645 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2646 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2647 return JNI_EINVAL; 2648 } 2649 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2650 return JNI_EINVAL; 2651 } 2652 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2653 return JNI_EINVAL; 2654 } 2655 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2656 uint max_tenuring_thresh = 0; 2657 if (!parse_uint(tail, &max_tenuring_thresh, 0)) { 2658 jio_fprintf(defaultStream::error_stream(), 2659 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2660 return JNI_EINVAL; 2661 } 2662 2663 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2664 return JNI_EINVAL; 2665 } 2666 2667 if (MaxTenuringThreshold == 0) { 2668 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2669 return JNI_EINVAL; 2670 } 2671 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2672 return JNI_EINVAL; 2673 } 2674 } else { 2675 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2676 return JNI_EINVAL; 2677 } 2678 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2679 return JNI_EINVAL; 2680 } 2681 } 2682 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2683 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2684 return JNI_EINVAL; 2685 } 2686 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2687 return JNI_EINVAL; 2688 } 2689 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2690 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2691 return JNI_EINVAL; 2692 } 2693 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2694 return JNI_EINVAL; 2695 } 2696 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2697 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2698 return JNI_EINVAL; 2699 } 2700 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2701 return JNI_EINVAL; 2702 } 2703 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2704 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2705 return JNI_EINVAL; 2706 } 2707 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2708 return JNI_EINVAL; 2709 } 2710 } else if (match_option(option, "--finalization=", &tail)) { 2711 if (strcmp(tail, "enabled") == 0) { 2712 InstanceKlass::set_finalization_enabled(true); 2713 } else if (strcmp(tail, "disabled") == 0) { 2714 InstanceKlass::set_finalization_enabled(false); 2715 } else { 2716 jio_fprintf(defaultStream::error_stream(), 2717 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2718 tail); 2719 return JNI_EINVAL; 2720 } 2721 #if !defined(DTRACE_ENABLED) 2722 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2723 jio_fprintf(defaultStream::error_stream(), 2724 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2725 return JNI_EINVAL; 2726 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2727 jio_fprintf(defaultStream::error_stream(), 2728 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2729 return JNI_EINVAL; 2730 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2731 jio_fprintf(defaultStream::error_stream(), 2732 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2733 return JNI_EINVAL; 2734 #endif // !defined(DTRACE_ENABLED) 2735 #ifdef ASSERT 2736 } else if (match_option(option, "-XX:+FullGCALot")) { 2737 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2738 return JNI_EINVAL; 2739 } 2740 #endif 2741 #if !INCLUDE_MANAGEMENT 2742 } else if (match_option(option, "-XX:+ManagementServer")) { 2743 jio_fprintf(defaultStream::error_stream(), 2744 "ManagementServer is not supported in this VM.\n"); 2745 return JNI_ERR; 2746 #endif // INCLUDE_MANAGEMENT 2747 #if INCLUDE_JVMCI 2748 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) { 2749 if (EnableJVMCIProduct) { 2750 jio_fprintf(defaultStream::error_stream(), 2751 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n"); 2752 return JNI_EINVAL; 2753 } 2754 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) { 2755 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT"); 2756 if (use_graal_jit) { 2757 const char* jvmci_compiler = get_property("jvmci.Compiler"); 2758 if (jvmci_compiler != nullptr) { 2759 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) { 2760 jio_fprintf(defaultStream::error_stream(), 2761 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler); 2762 return JNI_ERR; 2763 } 2764 } else if (!add_property("jvmci.Compiler=graal")) { 2765 return JNI_ENOMEM; 2766 } 2767 } 2768 2769 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before 2770 if (EnableJVMCIProduct) { 2771 continue; 2772 } 2773 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2774 // Allow this flag if it has been unlocked. 2775 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) { 2776 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) { 2777 jio_fprintf(defaultStream::error_stream(), 2778 "Unable to enable JVMCI in product mode\n"); 2779 return JNI_ERR; 2780 } 2781 } 2782 // The flag was locked so process normally to report that error 2783 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2784 return JNI_EINVAL; 2785 } 2786 #endif // INCLUDE_JVMCI 2787 #if INCLUDE_JFR 2788 } else if (match_jfr_option(&option)) { 2789 return JNI_EINVAL; 2790 #endif 2791 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2792 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2793 // already been handled 2794 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2795 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2796 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2797 return JNI_EINVAL; 2798 } 2799 } 2800 // Unknown option 2801 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2802 return JNI_ERR; 2803 } 2804 } 2805 2806 // PrintSharedArchiveAndExit will turn on 2807 // -Xshare:on 2808 // -Xlog:class+path=info 2809 if (PrintSharedArchiveAndExit) { 2810 UseSharedSpaces = true; 2811 RequireSharedSpaces = true; 2812 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2813 } 2814 2815 fix_appclasspath(); 2816 2817 return JNI_OK; 2818 } 2819 2820 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path) { 2821 // For java.base check for duplicate --patch-module options being specified on the command line. 2822 // This check is only required for java.base, all other duplicate module specifications 2823 // will be checked during module system initialization. The module system initialization 2824 // will throw an ExceptionInInitializerError if this situation occurs. 2825 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2826 if (patch_mod_javabase) { 2827 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2828 } else { 2829 patch_mod_javabase = true; 2830 } 2831 } 2832 2833 // Create GrowableArray lazily, only if --patch-module has been specified 2834 if (_patch_mod_prefix == nullptr) { 2835 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2836 } 2837 2838 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2839 } 2840 2841 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2842 // 2843 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2844 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2845 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2846 // path is treated as the current directory. 2847 // 2848 // This causes problems with CDS, which requires that all directories specified in the classpath 2849 // must be empty. In most cases, applications do NOT want to load classes from the current 2850 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2851 // scripts compatible with CDS. 2852 void Arguments::fix_appclasspath() { 2853 if (IgnoreEmptyClassPaths) { 2854 const char separator = *os::path_separator(); 2855 const char* src = _java_class_path->value(); 2856 2857 // skip over all the leading empty paths 2858 while (*src == separator) { 2859 src ++; 2860 } 2861 2862 char* copy = os::strdup_check_oom(src, mtArguments); 2863 2864 // trim all trailing empty paths 2865 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 2866 *tail = '\0'; 2867 } 2868 2869 char from[3] = {separator, separator, '\0'}; 2870 char to [2] = {separator, '\0'}; 2871 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 2872 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 2873 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 2874 } 2875 2876 _java_class_path->set_writeable_value(copy); 2877 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 2878 } 2879 } 2880 2881 jint Arguments::finalize_vm_init_args() { 2882 // check if the default lib/endorsed directory exists; if so, error 2883 char path[JVM_MAXPATHLEN]; 2884 const char* fileSep = os::file_separator(); 2885 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 2886 2887 DIR* dir = os::opendir(path); 2888 if (dir != nullptr) { 2889 jio_fprintf(defaultStream::output_stream(), 2890 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 2891 "in modular form will be supported via the concept of upgradeable modules.\n"); 2892 os::closedir(dir); 2893 return JNI_ERR; 2894 } 2895 2896 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 2897 dir = os::opendir(path); 2898 if (dir != nullptr) { 2899 jio_fprintf(defaultStream::output_stream(), 2900 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 2901 "Use -classpath instead.\n."); 2902 os::closedir(dir); 2903 return JNI_ERR; 2904 } 2905 2906 // This must be done after all arguments have been processed 2907 // and the container support has been initialized since AggressiveHeap 2908 // relies on the amount of total memory available. 2909 if (AggressiveHeap) { 2910 jint result = set_aggressive_heap_flags(); 2911 if (result != JNI_OK) { 2912 return result; 2913 } 2914 } 2915 2916 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 2917 // but like -Xint, leave compilation thresholds unaffected. 2918 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 2919 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 2920 set_mode_flags(_int); 2921 } 2922 2923 #ifdef ZERO 2924 // Zero always runs in interpreted mode 2925 set_mode_flags(_int); 2926 #endif 2927 2928 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 2929 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 2930 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 2931 } 2932 2933 #if !COMPILER2_OR_JVMCI 2934 // Don't degrade server performance for footprint 2935 if (FLAG_IS_DEFAULT(UseLargePages) && 2936 MaxHeapSize < LargePageHeapSizeThreshold) { 2937 // No need for large granularity pages w/small heaps. 2938 // Note that large pages are enabled/disabled for both the 2939 // Java heap and the code cache. 2940 FLAG_SET_DEFAULT(UseLargePages, false); 2941 } 2942 2943 UNSUPPORTED_OPTION(ProfileInterpreter); 2944 #endif 2945 2946 // Parse the CompilationMode flag 2947 if (!CompilationModeFlag::initialize()) { 2948 return JNI_ERR; 2949 } 2950 2951 if (!check_vm_args_consistency()) { 2952 return JNI_ERR; 2953 } 2954 2955 2956 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 2957 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 2958 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 2959 2960 return JNI_OK; 2961 } 2962 2963 // Helper class for controlling the lifetime of JavaVMInitArgs 2964 // objects. The contents of the JavaVMInitArgs are guaranteed to be 2965 // deleted on the destruction of the ScopedVMInitArgs object. 2966 class ScopedVMInitArgs : public StackObj { 2967 private: 2968 JavaVMInitArgs _args; 2969 char* _container_name; 2970 bool _is_set; 2971 char* _vm_options_file_arg; 2972 2973 public: 2974 ScopedVMInitArgs(const char *container_name) { 2975 _args.version = JNI_VERSION_1_2; 2976 _args.nOptions = 0; 2977 _args.options = nullptr; 2978 _args.ignoreUnrecognized = false; 2979 _container_name = (char *)container_name; 2980 _is_set = false; 2981 _vm_options_file_arg = nullptr; 2982 } 2983 2984 // Populates the JavaVMInitArgs object represented by this 2985 // ScopedVMInitArgs object with the arguments in options. The 2986 // allocated memory is deleted by the destructor. If this method 2987 // returns anything other than JNI_OK, then this object is in a 2988 // partially constructed state, and should be abandoned. 2989 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 2990 _is_set = true; 2991 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 2992 JavaVMOption, options->length(), mtArguments); 2993 if (options_arr == nullptr) { 2994 return JNI_ENOMEM; 2995 } 2996 _args.options = options_arr; 2997 2998 for (int i = 0; i < options->length(); i++) { 2999 options_arr[i] = options->at(i); 3000 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3001 if (options_arr[i].optionString == nullptr) { 3002 // Rely on the destructor to do cleanup. 3003 _args.nOptions = i; 3004 return JNI_ENOMEM; 3005 } 3006 } 3007 3008 _args.nOptions = options->length(); 3009 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3010 return JNI_OK; 3011 } 3012 3013 JavaVMInitArgs* get() { return &_args; } 3014 char* container_name() { return _container_name; } 3015 bool is_set() { return _is_set; } 3016 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; } 3017 char* vm_options_file_arg() { return _vm_options_file_arg; } 3018 3019 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3020 if (_vm_options_file_arg != nullptr) { 3021 os::free(_vm_options_file_arg); 3022 } 3023 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3024 } 3025 3026 ~ScopedVMInitArgs() { 3027 if (_vm_options_file_arg != nullptr) { 3028 os::free(_vm_options_file_arg); 3029 } 3030 if (_args.options == nullptr) return; 3031 for (int i = 0; i < _args.nOptions; i++) { 3032 os::free(_args.options[i].optionString); 3033 } 3034 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3035 } 3036 3037 // Insert options into this option list, to replace option at 3038 // vm_options_file_pos (-XX:VMOptionsFile) 3039 jint insert(const JavaVMInitArgs* args, 3040 const JavaVMInitArgs* args_to_insert, 3041 const int vm_options_file_pos) { 3042 assert(_args.options == nullptr, "shouldn't be set yet"); 3043 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3044 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3045 3046 int length = args->nOptions + args_to_insert->nOptions - 1; 3047 // Construct new option array 3048 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3049 for (int i = 0; i < args->nOptions; i++) { 3050 if (i == vm_options_file_pos) { 3051 // insert the new options starting at the same place as the 3052 // -XX:VMOptionsFile option 3053 for (int j = 0; j < args_to_insert->nOptions; j++) { 3054 options.push(args_to_insert->options[j]); 3055 } 3056 } else { 3057 options.push(args->options[i]); 3058 } 3059 } 3060 // make into options array 3061 return set_args(&options); 3062 } 3063 }; 3064 3065 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3066 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3067 } 3068 3069 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3070 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3071 } 3072 3073 static JavaVMOption* get_last_aotmode_arg(const JavaVMInitArgs* args) { 3074 for (int index = args->nOptions - 1; index >= 0; index--) { 3075 JavaVMOption* option = args->options + index; 3076 if (strstr(option->optionString, "-XX:AOTMode=") == option->optionString) { 3077 return option; 3078 } 3079 } 3080 3081 return nullptr; 3082 } 3083 3084 jint Arguments::parse_jdk_aot_vm_options_environment_variable(GrowableArrayCHeap<VMInitArgsGroup, mtArguments>* all_args, 3085 ScopedVMInitArgs* jdk_aot_vm_options_args) { 3086 // Don't bother scanning all the args if this env variable is not set 3087 if (::getenv("JDK_AOT_VM_OPTIONS") == nullptr) { 3088 return JNI_OK; 3089 } 3090 3091 // Scan backwards and find the last occurrence of -XX:AOTMode=xxx, which will decide the value 3092 // of AOTMode. 3093 JavaVMOption* option = nullptr; 3094 for (int i = all_args->length() - 1; i >= 0; i--) { 3095 if ((option = get_last_aotmode_arg(all_args->at(i)._args)) != nullptr) { 3096 break; 3097 } 3098 } 3099 3100 if (option != nullptr) { 3101 // We have found the last -XX:AOTMode=xxx. At this point <option> has NOT been parsed yet, 3102 // so its value is not reflected inside the global variable AOTMode. 3103 if (strcmp(option->optionString, "-XX:AOTMode=create") != 0) { 3104 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS 3105 } 3106 } else { 3107 // -XX:AOTMode is not specified in any of 4 options_args, let's check AOTMode, 3108 // which would have been set inside process_settings_file(); 3109 if (AOTMode == nullptr || strcmp(AOTMode, "create") != 0) { 3110 return JNI_OK; // Do not parse JDK_AOT_VM_OPTIONS 3111 } 3112 } 3113 3114 return parse_options_environment_variable("JDK_AOT_VM_OPTIONS", jdk_aot_vm_options_args); 3115 } 3116 3117 jint Arguments::parse_options_environment_variable(const char* name, 3118 ScopedVMInitArgs* vm_args) { 3119 char *buffer = ::getenv(name); 3120 3121 // Don't check this environment variable if user has special privileges 3122 // (e.g. unix su command). 3123 if (buffer == nullptr || os::have_special_privileges()) { 3124 return JNI_OK; 3125 } 3126 3127 if ((buffer = os::strdup(buffer)) == nullptr) { 3128 return JNI_ENOMEM; 3129 } 3130 3131 jio_fprintf(defaultStream::error_stream(), 3132 "Picked up %s: %s\n", name, buffer); 3133 3134 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3135 3136 os::free(buffer); 3137 return retcode; 3138 } 3139 3140 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3141 // read file into buffer 3142 int fd = ::open(file_name, O_RDONLY); 3143 if (fd < 0) { 3144 jio_fprintf(defaultStream::error_stream(), 3145 "Could not open options file '%s'\n", 3146 file_name); 3147 return JNI_ERR; 3148 } 3149 3150 struct stat stbuf; 3151 int retcode = os::stat(file_name, &stbuf); 3152 if (retcode != 0) { 3153 jio_fprintf(defaultStream::error_stream(), 3154 "Could not stat options file '%s'\n", 3155 file_name); 3156 ::close(fd); 3157 return JNI_ERR; 3158 } 3159 3160 if (stbuf.st_size == 0) { 3161 // tell caller there is no option data and that is ok 3162 ::close(fd); 3163 return JNI_OK; 3164 } 3165 3166 // '+ 1' for null termination even with max bytes 3167 size_t bytes_alloc = stbuf.st_size + 1; 3168 3169 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3170 if (nullptr == buf) { 3171 jio_fprintf(defaultStream::error_stream(), 3172 "Could not allocate read buffer for options file parse\n"); 3173 ::close(fd); 3174 return JNI_ENOMEM; 3175 } 3176 3177 memset(buf, 0, bytes_alloc); 3178 3179 // Fill buffer 3180 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3181 ::close(fd); 3182 if (bytes_read < 0) { 3183 FREE_C_HEAP_ARRAY(char, buf); 3184 jio_fprintf(defaultStream::error_stream(), 3185 "Could not read options file '%s'\n", file_name); 3186 return JNI_ERR; 3187 } 3188 3189 if (bytes_read == 0) { 3190 // tell caller there is no option data and that is ok 3191 FREE_C_HEAP_ARRAY(char, buf); 3192 return JNI_OK; 3193 } 3194 3195 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3196 3197 FREE_C_HEAP_ARRAY(char, buf); 3198 return retcode; 3199 } 3200 3201 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3202 // Construct option array 3203 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3204 3205 // some pointers to help with parsing 3206 char *buffer_end = buffer + buf_len; 3207 char *opt_hd = buffer; 3208 char *wrt = buffer; 3209 char *rd = buffer; 3210 3211 // parse all options 3212 while (rd < buffer_end) { 3213 // skip leading white space from the input string 3214 while (rd < buffer_end && isspace((unsigned char) *rd)) { 3215 rd++; 3216 } 3217 3218 if (rd >= buffer_end) { 3219 break; 3220 } 3221 3222 // Remember this is where we found the head of the token. 3223 opt_hd = wrt; 3224 3225 // Tokens are strings of non white space characters separated 3226 // by one or more white spaces. 3227 while (rd < buffer_end && !isspace((unsigned char) *rd)) { 3228 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3229 int quote = *rd; // matching quote to look for 3230 rd++; // don't copy open quote 3231 while (rd < buffer_end && *rd != quote) { 3232 // include everything (even spaces) 3233 // up until the close quote 3234 *wrt++ = *rd++; // copy to option string 3235 } 3236 3237 if (rd < buffer_end) { 3238 rd++; // don't copy close quote 3239 } else { 3240 // did not see closing quote 3241 jio_fprintf(defaultStream::error_stream(), 3242 "Unmatched quote in %s\n", name); 3243 return JNI_ERR; 3244 } 3245 } else { 3246 *wrt++ = *rd++; // copy to option string 3247 } 3248 } 3249 3250 // steal a white space character and set it to null 3251 *wrt++ = '\0'; 3252 // We now have a complete token 3253 3254 JavaVMOption option; 3255 option.optionString = opt_hd; 3256 option.extraInfo = nullptr; 3257 3258 options.append(option); // Fill in option 3259 3260 rd++; // Advance to next character 3261 } 3262 3263 // Fill out JavaVMInitArgs structure. 3264 return vm_args->set_args(&options); 3265 } 3266 3267 #ifndef PRODUCT 3268 // Determine whether LogVMOutput should be implicitly turned on. 3269 static bool use_vm_log() { 3270 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3271 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3272 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3273 PrintAssembly || TraceDeoptimization || 3274 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3275 return true; 3276 } 3277 3278 #ifdef COMPILER1 3279 if (PrintC1Statistics) { 3280 return true; 3281 } 3282 #endif // COMPILER1 3283 3284 #ifdef COMPILER2 3285 if (PrintOptoAssembly || PrintOptoStatistics) { 3286 return true; 3287 } 3288 #endif // COMPILER2 3289 3290 return false; 3291 } 3292 3293 #endif // PRODUCT 3294 3295 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3296 for (int index = 0; index < args->nOptions; index++) { 3297 const JavaVMOption* option = args->options + index; 3298 const char* tail; 3299 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3300 return true; 3301 } 3302 } 3303 return false; 3304 } 3305 3306 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3307 const char* vm_options_file, 3308 const int vm_options_file_pos, 3309 ScopedVMInitArgs* vm_options_file_args, 3310 ScopedVMInitArgs* args_out) { 3311 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3312 if (code != JNI_OK) { 3313 return code; 3314 } 3315 3316 if (vm_options_file_args->get()->nOptions < 1) { 3317 return JNI_OK; 3318 } 3319 3320 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3321 jio_fprintf(defaultStream::error_stream(), 3322 "A VM options file may not refer to a VM options file. " 3323 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3324 "options file '%s' in options container '%s' is an error.\n", 3325 vm_options_file_args->vm_options_file_arg(), 3326 vm_options_file_args->container_name()); 3327 return JNI_EINVAL; 3328 } 3329 3330 return args_out->insert(args, vm_options_file_args->get(), 3331 vm_options_file_pos); 3332 } 3333 3334 // Expand -XX:VMOptionsFile found in args_in as needed. 3335 // mod_args and args_out parameters may return values as needed. 3336 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3337 ScopedVMInitArgs* mod_args, 3338 JavaVMInitArgs** args_out) { 3339 jint code = match_special_option_and_act(args_in, mod_args); 3340 if (code != JNI_OK) { 3341 return code; 3342 } 3343 3344 if (mod_args->is_set()) { 3345 // args_in contains -XX:VMOptionsFile and mod_args contains the 3346 // original options from args_in along with the options expanded 3347 // from the VMOptionsFile. Return a short-hand to the caller. 3348 *args_out = mod_args->get(); 3349 } else { 3350 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3351 } 3352 return JNI_OK; 3353 } 3354 3355 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3356 ScopedVMInitArgs* args_out) { 3357 // Remaining part of option string 3358 const char* tail; 3359 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3360 3361 for (int index = 0; index < args->nOptions; index++) { 3362 const JavaVMOption* option = args->options + index; 3363 if (match_option(option, "-XX:Flags=", &tail)) { 3364 Arguments::set_jvm_flags_file(tail); 3365 continue; 3366 } 3367 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3368 if (vm_options_file_args.found_vm_options_file_arg()) { 3369 jio_fprintf(defaultStream::error_stream(), 3370 "The option '%s' is already specified in the options " 3371 "container '%s' so the specification of '%s' in the " 3372 "same options container is an error.\n", 3373 vm_options_file_args.vm_options_file_arg(), 3374 vm_options_file_args.container_name(), 3375 option->optionString); 3376 return JNI_EINVAL; 3377 } 3378 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3379 // If there's a VMOptionsFile, parse that 3380 jint code = insert_vm_options_file(args, tail, index, 3381 &vm_options_file_args, args_out); 3382 if (code != JNI_OK) { 3383 return code; 3384 } 3385 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3386 if (args_out->is_set()) { 3387 // The VMOptions file inserted some options so switch 'args' 3388 // to the new set of options, and continue processing which 3389 // preserves "last option wins" semantics. 3390 args = args_out->get(); 3391 // The first option from the VMOptionsFile replaces the 3392 // current option. So we back track to process the 3393 // replacement option. 3394 index--; 3395 } 3396 continue; 3397 } 3398 if (match_option(option, "-XX:+PrintVMOptions")) { 3399 PrintVMOptions = true; 3400 continue; 3401 } 3402 if (match_option(option, "-XX:-PrintVMOptions")) { 3403 PrintVMOptions = false; 3404 continue; 3405 } 3406 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3407 IgnoreUnrecognizedVMOptions = true; 3408 continue; 3409 } 3410 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3411 IgnoreUnrecognizedVMOptions = false; 3412 continue; 3413 } 3414 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3415 JVMFlag::printFlags(tty, false); 3416 vm_exit(0); 3417 } 3418 3419 #ifndef PRODUCT 3420 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3421 JVMFlag::printFlags(tty, true); 3422 vm_exit(0); 3423 } 3424 #endif 3425 } 3426 return JNI_OK; 3427 } 3428 3429 static void print_options(const JavaVMInitArgs *args) { 3430 const char* tail; 3431 for (int index = 0; index < args->nOptions; index++) { 3432 const JavaVMOption *option = args->options + index; 3433 if (match_option(option, "-XX:", &tail)) { 3434 logOption(tail); 3435 } 3436 } 3437 } 3438 3439 bool Arguments::handle_deprecated_print_gc_flags() { 3440 if (PrintGC) { 3441 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3442 } 3443 if (PrintGCDetails) { 3444 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3445 } 3446 3447 if (_legacyGCLogging.lastFlag == 2) { 3448 // -Xloggc was used to specify a filename 3449 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3450 3451 LogTarget(Error, logging) target; 3452 LogStream errstream(target); 3453 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream); 3454 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3455 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3456 } 3457 return true; 3458 } 3459 3460 static void apply_debugger_ergo() { 3461 #ifdef ASSERT 3462 if (ReplayCompiles) { 3463 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3464 } 3465 3466 if (UseDebuggerErgo) { 3467 // Turn on sub-flags 3468 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3469 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3470 } 3471 3472 if (UseDebuggerErgo2) { 3473 // Debugging with limited number of CPUs 3474 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3475 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3476 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3477 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3478 } 3479 #endif // ASSERT 3480 } 3481 3482 // Parse entry point called from JNI_CreateJavaVM 3483 3484 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3485 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3486 JVMFlag::check_all_flag_declarations(); 3487 3488 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3489 const char* hotspotrc = ".hotspotrc"; 3490 bool settings_file_specified = false; 3491 bool needs_hotspotrc_warning = false; 3492 ScopedVMInitArgs initial_vm_options_args(""); 3493 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3494 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3495 ScopedVMInitArgs initial_jdk_aot_vm_options_args("env_var='JDK_AOT_VM_OPTIONS'"); 3496 3497 // Pointers to current working set of containers 3498 JavaVMInitArgs* cur_cmd_args; 3499 JavaVMInitArgs* cur_vm_options_args; 3500 JavaVMInitArgs* cur_java_options_args; 3501 JavaVMInitArgs* cur_java_tool_options_args; 3502 JavaVMInitArgs* cur_jdk_aot_vm_options_args; 3503 3504 // Containers for modified/expanded options 3505 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3506 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3507 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3508 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3509 ScopedVMInitArgs mod_jdk_aot_vm_options_args("env_var='_JDK_AOT_VM_OPTIONS'"); 3510 3511 GrowableArrayCHeap<VMInitArgsGroup, mtArguments> all_args; 3512 3513 jint code = 3514 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3515 if (code != JNI_OK) { 3516 return code; 3517 } 3518 3519 // Yet another environment variable: _JAVA_OPTIONS. This mimics the classic VM. 3520 // This is an undocumented feature. 3521 code = parse_java_options_environment_variable(&initial_java_options_args); 3522 if (code != JNI_OK) { 3523 return code; 3524 } 3525 3526 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3527 char *vmoptions = ClassLoader::lookup_vm_options(); 3528 if (vmoptions != nullptr) { 3529 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3530 FREE_C_HEAP_ARRAY(char, vmoptions); 3531 if (code != JNI_OK) { 3532 return code; 3533 } 3534 } 3535 3536 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3537 &mod_java_tool_options_args, 3538 &cur_java_tool_options_args); 3539 if (code != JNI_OK) { 3540 return code; 3541 } 3542 3543 code = expand_vm_options_as_needed(initial_cmd_args, 3544 &mod_cmd_args, 3545 &cur_cmd_args); 3546 if (code != JNI_OK) { 3547 return code; 3548 } 3549 3550 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3551 &mod_java_options_args, 3552 &cur_java_options_args); 3553 if (code != JNI_OK) { 3554 return code; 3555 } 3556 3557 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3558 &mod_vm_options_args, 3559 &cur_vm_options_args); 3560 if (code != JNI_OK) { 3561 return code; 3562 } 3563 3564 const char* flags_file = Arguments::get_jvm_flags_file(); 3565 settings_file_specified = (flags_file != nullptr); 3566 3567 // Parse specified settings file (s) -- the effects are applied immediately into the JVM global flags. 3568 if (settings_file_specified) { 3569 if (!process_settings_file(flags_file, true, 3570 IgnoreUnrecognizedVMOptions)) { 3571 return JNI_EINVAL; 3572 } 3573 } else { 3574 #ifdef ASSERT 3575 // Parse default .hotspotrc settings file 3576 if (!process_settings_file(".hotspotrc", false, 3577 IgnoreUnrecognizedVMOptions)) { 3578 return JNI_EINVAL; 3579 } 3580 #else 3581 struct stat buf; 3582 if (os::stat(hotspotrc, &buf) == 0) { 3583 needs_hotspotrc_warning = true; 3584 } 3585 #endif 3586 } 3587 3588 // The settings in the args are applied in this order to the the JVM global flags. 3589 // For historical reasons, the order is DIFFERENT than the scanning order of 3590 // the above expand_vm_options_as_needed() calls. 3591 all_args.append({cur_vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE}); 3592 all_args.append({cur_java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR}); 3593 all_args.append({cur_cmd_args, JVMFlagOrigin::COMMAND_LINE}); 3594 all_args.append({cur_java_options_args, JVMFlagOrigin::ENVIRON_VAR}); 3595 3596 // JDK_AOT_VM_OPTIONS are parsed only if -XX:AOTMode=create has been detected from all 3597 // the options that have been gathered above. 3598 code = parse_jdk_aot_vm_options_environment_variable(&all_args, &initial_jdk_aot_vm_options_args); 3599 if (code != JNI_OK) { 3600 return code; 3601 } 3602 code = expand_vm_options_as_needed(initial_jdk_aot_vm_options_args.get(), 3603 &mod_jdk_aot_vm_options_args, 3604 &cur_jdk_aot_vm_options_args); 3605 if (code != JNI_OK) { 3606 return code; 3607 } 3608 3609 for (int index = 0; index < cur_jdk_aot_vm_options_args->nOptions; index++) { 3610 JavaVMOption* option = cur_jdk_aot_vm_options_args->options + index; 3611 const char* optionString = option->optionString; 3612 if (strstr(optionString, "-XX:AOTMode=") == optionString && 3613 strcmp(optionString, "-XX:AOTMode=create") != 0) { 3614 jio_fprintf(defaultStream::error_stream(), 3615 "Option %s cannot be specified in JDK_AOT_VM_OPTIONS\n", optionString); 3616 return JNI_ERR; 3617 } 3618 } 3619 3620 all_args.append({cur_jdk_aot_vm_options_args, JVMFlagOrigin::ENVIRON_VAR}); 3621 3622 if (IgnoreUnrecognizedVMOptions) { 3623 // Note: unrecognized options in cur_vm_options_arg cannot be ignored. They are part of 3624 // the JDK so it shouldn't have bad options. 3625 cur_cmd_args->ignoreUnrecognized = true; 3626 cur_java_tool_options_args->ignoreUnrecognized = true; 3627 cur_java_options_args->ignoreUnrecognized = true; 3628 cur_jdk_aot_vm_options_args->ignoreUnrecognized = true; 3629 } 3630 3631 if (PrintVMOptions) { 3632 // For historical reasons, options specified in cur_vm_options_arg and -XX:Flags are not printed. 3633 print_options(cur_java_tool_options_args); 3634 print_options(cur_cmd_args); 3635 print_options(cur_java_options_args); 3636 print_options(cur_jdk_aot_vm_options_args); 3637 } 3638 3639 // Apply the settings in these args to the JVM global flags. 3640 jint result = parse_vm_init_args(&all_args); 3641 3642 if (result != JNI_OK) { 3643 return result; 3644 } 3645 3646 // Delay warning until here so that we've had a chance to process 3647 // the -XX:-PrintWarnings flag 3648 if (needs_hotspotrc_warning) { 3649 warning("%s file is present but has been ignored. " 3650 "Run with -XX:Flags=%s to load the file.", 3651 hotspotrc, hotspotrc); 3652 } 3653 3654 if (needs_module_property_warning) { 3655 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3656 " names that are reserved for internal use."); 3657 } 3658 3659 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3660 UNSUPPORTED_OPTION(UseLargePages); 3661 #endif 3662 3663 #if defined(AIX) 3664 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3665 #endif 3666 3667 #ifndef PRODUCT 3668 if (TraceBytecodesAt != 0) { 3669 TraceBytecodes = true; 3670 } 3671 #endif // PRODUCT 3672 3673 if (ScavengeRootsInCode == 0) { 3674 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3675 warning("Forcing ScavengeRootsInCode non-zero"); 3676 } 3677 ScavengeRootsInCode = 1; 3678 } 3679 3680 if (!handle_deprecated_print_gc_flags()) { 3681 return JNI_EINVAL; 3682 } 3683 3684 // Set object alignment values. 3685 set_object_alignment(); 3686 3687 #if !INCLUDE_CDS 3688 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) { 3689 jio_fprintf(defaultStream::error_stream(), 3690 "Shared spaces are not supported in this VM\n"); 3691 return JNI_ERR; 3692 } 3693 if (DumpLoadedClassList != nullptr) { 3694 jio_fprintf(defaultStream::error_stream(), 3695 "DumpLoadedClassList is not supported in this VM\n"); 3696 return JNI_ERR; 3697 } 3698 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) || 3699 log_is_enabled(Info, cds) || log_is_enabled(Info, aot)) { 3700 warning("Shared spaces are not supported in this VM"); 3701 UseSharedSpaces = false; 3702 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3703 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(aot)); 3704 } 3705 no_shared_spaces("CDS Disabled"); 3706 #endif // INCLUDE_CDS 3707 3708 // Verify NMT arguments 3709 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 3710 if (lvl == NMT_unknown) { 3711 jio_fprintf(defaultStream::error_stream(), 3712 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n"); 3713 return JNI_ERR; 3714 } 3715 if (PrintNMTStatistics && lvl == NMT_off) { 3716 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 3717 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 3718 } 3719 3720 bool trace_dependencies = log_is_enabled(Debug, dependencies); 3721 if (trace_dependencies && VerifyDependencies) { 3722 warning("dependency logging results may be inflated by VerifyDependencies"); 3723 } 3724 3725 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) || 3726 log_is_enabled(Info, class, load, cause); 3727 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) { 3728 warning("class load cause logging will not produce output without LogClassLoadingCauseFor"); 3729 } 3730 3731 apply_debugger_ergo(); 3732 3733 // The VMThread needs to stop now and then to execute these debug options. 3734 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) { 3735 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000); 3736 } 3737 3738 if (log_is_enabled(Info, arguments)) { 3739 LogStream st(Log(arguments)::info()); 3740 Arguments::print_on(&st); 3741 } 3742 3743 return JNI_OK; 3744 } 3745 3746 void Arguments::set_compact_headers_flags() { 3747 #ifdef _LP64 3748 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) { 3749 warning("Compact object headers require compressed class pointers. Disabling compact object headers."); 3750 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false); 3751 } 3752 if (UseCompactObjectHeaders && !UseObjectMonitorTable) { 3753 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable. 3754 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) { 3755 FLAG_SET_DEFAULT(UseObjectMonitorTable, true); 3756 3757 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders. 3758 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) { 3759 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false); 3760 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable. 3761 } else { 3762 FLAG_SET_DEFAULT(UseObjectMonitorTable, true); 3763 } 3764 } 3765 if (UseCompactObjectHeaders && !UseCompressedClassPointers) { 3766 FLAG_SET_DEFAULT(UseCompressedClassPointers, true); 3767 } 3768 #endif 3769 } 3770 3771 jint Arguments::apply_ergo() { 3772 // Set flags based on ergonomics. 3773 jint result = set_ergonomics_flags(); 3774 if (result != JNI_OK) return result; 3775 3776 // Set heap size based on available physical memory 3777 set_heap_size(); 3778 3779 GCConfig::arguments()->initialize(); 3780 3781 set_compact_headers_flags(); 3782 3783 if (UseCompressedClassPointers) { 3784 CompressedKlassPointers::pre_initialize(); 3785 } 3786 3787 CDSConfig::ergo_initialize(); 3788 3789 // Initialize Metaspace flags and alignments 3790 Metaspace::ergo_initialize(); 3791 3792 if (!StringDedup::ergo_initialize()) { 3793 return JNI_EINVAL; 3794 } 3795 3796 // Set compiler flags after GC is selected and GC specific 3797 // flags (LoopStripMiningIter) are set. 3798 CompilerConfig::ergo_initialize(); 3799 3800 // Set bytecode rewriting flags 3801 set_bytecode_flags(); 3802 3803 // Set flags if aggressive optimization flags are enabled 3804 jint code = set_aggressive_opts_flags(); 3805 if (code != JNI_OK) { 3806 return code; 3807 } 3808 3809 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) { 3810 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table()); 3811 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) { 3812 warning("UseSecondarySupersTable is not supported"); 3813 FLAG_SET_DEFAULT(UseSecondarySupersTable, false); 3814 } 3815 if (!UseSecondarySupersTable) { 3816 FLAG_SET_DEFAULT(StressSecondarySupers, false); 3817 FLAG_SET_DEFAULT(VerifySecondarySupers, false); 3818 } 3819 3820 #ifdef ZERO 3821 // Clear flags not supported on zero. 3822 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3823 #endif // ZERO 3824 3825 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3826 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3827 DebugNonSafepoints = true; 3828 } 3829 3830 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3831 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3832 } 3833 3834 // Treat the odd case where local verification is enabled but remote 3835 // verification is not as if both were enabled. 3836 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 3837 log_info(verification)("Turning on remote verification because local verification is on"); 3838 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 3839 } 3840 3841 #ifndef PRODUCT 3842 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3843 if (use_vm_log()) { 3844 LogVMOutput = true; 3845 } 3846 } 3847 #endif // PRODUCT 3848 3849 if (PrintCommandLineFlags) { 3850 JVMFlag::printSetFlags(tty); 3851 } 3852 3853 #if COMPILER2_OR_JVMCI 3854 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 3855 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 3856 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 3857 } 3858 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 3859 3860 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 3861 if (!EnableVectorReboxing) { 3862 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 3863 } else { 3864 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 3865 } 3866 } 3867 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 3868 } 3869 #endif // COMPILER2_OR_JVMCI 3870 3871 #ifdef COMPILER2 3872 if (!FLAG_IS_DEFAULT(UseLoopPredicate) && !UseLoopPredicate && UseProfiledLoopPredicate) { 3873 warning("Disabling UseProfiledLoopPredicate since UseLoopPredicate is turned off."); 3874 FLAG_SET_ERGO(UseProfiledLoopPredicate, false); 3875 } 3876 #endif // COMPILER2 3877 3878 if (log_is_enabled(Info, perf, class, link)) { 3879 if (!UsePerfData) { 3880 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off."); 3881 LogConfiguration::disable_tags(false, LOG_TAGS(perf, class, link)); 3882 assert(!log_is_enabled(Info, perf, class, link), "sanity"); 3883 } 3884 } 3885 3886 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 3887 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 3888 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 3889 } 3890 } 3891 return JNI_OK; 3892 } 3893 3894 jint Arguments::adjust_after_os() { 3895 if (UseNUMA) { 3896 if (UseParallelGC) { 3897 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3898 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3899 } 3900 } 3901 } 3902 return JNI_OK; 3903 } 3904 3905 int Arguments::PropertyList_count(SystemProperty* pl) { 3906 int count = 0; 3907 while(pl != nullptr) { 3908 count++; 3909 pl = pl->next(); 3910 } 3911 return count; 3912 } 3913 3914 // Return the number of readable properties. 3915 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 3916 int count = 0; 3917 while(pl != nullptr) { 3918 if (pl->readable()) { 3919 count++; 3920 } 3921 pl = pl->next(); 3922 } 3923 return count; 3924 } 3925 3926 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3927 assert(key != nullptr, "just checking"); 3928 SystemProperty* prop; 3929 for (prop = pl; prop != nullptr; prop = prop->next()) { 3930 if (strcmp(key, prop->key()) == 0) return prop->value(); 3931 } 3932 return nullptr; 3933 } 3934 3935 // Return the value of the requested property provided that it is a readable property. 3936 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 3937 assert(key != nullptr, "just checking"); 3938 SystemProperty* prop; 3939 // Return the property value if the keys match and the property is not internal or 3940 // it's the special internal property "jdk.boot.class.path.append". 3941 for (prop = pl; prop != nullptr; prop = prop->next()) { 3942 if (strcmp(key, prop->key()) == 0) { 3943 if (!prop->internal()) { 3944 return prop->value(); 3945 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 3946 return prop->value(); 3947 } else { 3948 // Property is internal and not jdk.boot.class.path.append so return null. 3949 return nullptr; 3950 } 3951 } 3952 } 3953 return nullptr; 3954 } 3955 3956 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3957 SystemProperty* p = *plist; 3958 if (p == nullptr) { 3959 *plist = new_p; 3960 } else { 3961 while (p->next() != nullptr) { 3962 p = p->next(); 3963 } 3964 p->set_next(new_p); 3965 } 3966 } 3967 3968 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 3969 bool writeable, bool internal) { 3970 if (plist == nullptr) 3971 return; 3972 3973 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 3974 PropertyList_add(plist, new_p); 3975 } 3976 3977 void Arguments::PropertyList_add(SystemProperty *element) { 3978 PropertyList_add(&_system_properties, element); 3979 } 3980 3981 // This add maintains unique property key in the list. 3982 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 3983 PropertyAppendable append, PropertyWriteable writeable, 3984 PropertyInternal internal) { 3985 if (plist == nullptr) 3986 return; 3987 3988 // If property key exists and is writeable, then update with new value. 3989 // Trying to update a non-writeable property is silently ignored. 3990 SystemProperty* prop; 3991 for (prop = *plist; prop != nullptr; prop = prop->next()) { 3992 if (strcmp(k, prop->key()) == 0) { 3993 if (append == AppendProperty) { 3994 prop->append_writeable_value(v); 3995 } else { 3996 prop->set_writeable_value(v); 3997 } 3998 return; 3999 } 4000 } 4001 4002 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4003 } 4004 4005 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4006 // Returns true if all of the source pointed by src has been copied over to 4007 // the destination buffer pointed by buf. Otherwise, returns false. 4008 // Notes: 4009 // 1. If the length (buflen) of the destination buffer excluding the 4010 // null terminator character is not long enough for holding the expanded 4011 // pid characters, it also returns false instead of returning the partially 4012 // expanded one. 4013 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4014 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4015 char* buf, size_t buflen) { 4016 const char* p = src; 4017 char* b = buf; 4018 const char* src_end = &src[srclen]; 4019 char* buf_end = &buf[buflen - 1]; 4020 4021 while (p < src_end && b < buf_end) { 4022 if (*p == '%') { 4023 switch (*(++p)) { 4024 case '%': // "%%" ==> "%" 4025 *b++ = *p++; 4026 break; 4027 case 'p': { // "%p" ==> current process id 4028 // buf_end points to the character before the last character so 4029 // that we could write '\0' to the end of the buffer. 4030 size_t buf_sz = buf_end - b + 1; 4031 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4032 4033 // if jio_snprintf fails or the buffer is not long enough to hold 4034 // the expanded pid, returns false. 4035 if (ret < 0 || ret >= (int)buf_sz) { 4036 return false; 4037 } else { 4038 b += ret; 4039 assert(*b == '\0', "fail in copy_expand_pid"); 4040 if (p == src_end && b == buf_end + 1) { 4041 // reach the end of the buffer. 4042 return true; 4043 } 4044 } 4045 p++; 4046 break; 4047 } 4048 default : 4049 *b++ = '%'; 4050 } 4051 } else { 4052 *b++ = *p++; 4053 } 4054 } 4055 *b = '\0'; 4056 return (p == src_end); // return false if not all of the source was copied 4057 }