1 /* 2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/cds_globals.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/filemap.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/moduleEntry.hpp" 32 #include "classfile/stringTable.hpp" 33 #include "classfile/symbolTable.hpp" 34 #include "compiler/compilerDefinitions.hpp" 35 #include "gc/shared/gcArguments.hpp" 36 #include "gc/shared/gcConfig.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/oop.inline.hpp" 49 #include "prims/jvmtiAgentList.hpp" 50 #include "prims/jvmtiExport.hpp" 51 #include "runtime/arguments.hpp" 52 #include "runtime/flags/jvmFlag.hpp" 53 #include "runtime/flags/jvmFlagAccess.hpp" 54 #include "runtime/flags/jvmFlagLimit.hpp" 55 #include "runtime/globals_extension.hpp" 56 #include "runtime/java.hpp" 57 #include "runtime/os.hpp" 58 #include "runtime/safepoint.hpp" 59 #include "runtime/safepointMechanism.hpp" 60 #include "runtime/synchronizer.hpp" 61 #include "runtime/vm_version.hpp" 62 #include "services/management.hpp" 63 #include "utilities/align.hpp" 64 #include "utilities/checkedCast.hpp" 65 #include "utilities/debug.hpp" 66 #include "utilities/defaultStream.hpp" 67 #include "utilities/macros.hpp" 68 #include "utilities/parseInteger.hpp" 69 #include "utilities/powerOfTwo.hpp" 70 #include "utilities/stringUtils.hpp" 71 #include "utilities/systemMemoryBarrier.hpp" 72 #if INCLUDE_JFR 73 #include "jfr/jfr.hpp" 74 #endif 75 76 #include <limits> 77 78 static const char _default_java_launcher[] = "generic"; 79 80 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher 81 82 char* Arguments::_jvm_flags_file = nullptr; 83 char** Arguments::_jvm_flags_array = nullptr; 84 int Arguments::_num_jvm_flags = 0; 85 char** Arguments::_jvm_args_array = nullptr; 86 int Arguments::_num_jvm_args = 0; 87 char* Arguments::_java_command = nullptr; 88 SystemProperty* Arguments::_system_properties = nullptr; 89 size_t Arguments::_conservative_max_heap_alignment = 0; 90 Arguments::Mode Arguments::_mode = _mixed; 91 const char* Arguments::_java_vendor_url_bug = nullptr; 92 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 93 bool Arguments::_sun_java_launcher_is_altjvm = false; 94 95 // These parameters are reset in method parse_vm_init_args() 96 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 97 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 98 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 99 bool Arguments::_ClipInlining = ClipInlining; 100 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 101 102 bool Arguments::_enable_preview = false; 103 104 char* Arguments::_default_shared_archive_path = nullptr; 105 char* Arguments::SharedArchivePath = nullptr; 106 char* Arguments::SharedDynamicArchivePath = nullptr; 107 108 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 }; 109 110 // These are not set by the JDK's built-in launchers, but they can be set by 111 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 112 // JavaVMOption in jni.h. 113 abort_hook_t Arguments::_abort_hook = nullptr; 114 exit_hook_t Arguments::_exit_hook = nullptr; 115 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr; 116 117 118 SystemProperty *Arguments::_sun_boot_library_path = nullptr; 119 SystemProperty *Arguments::_java_library_path = nullptr; 120 SystemProperty *Arguments::_java_home = nullptr; 121 SystemProperty *Arguments::_java_class_path = nullptr; 122 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr; 123 SystemProperty *Arguments::_vm_info = nullptr; 124 125 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr; 126 PathString *Arguments::_boot_class_path = nullptr; 127 bool Arguments::_has_jimage = false; 128 129 char* Arguments::_ext_dirs = nullptr; 130 131 // True if -Xshare:auto option was specified. 132 static bool xshare_auto_cmd_line = false; 133 134 // True if -Xint/-Xmixed/-Xcomp were specified 135 static bool mode_flag_cmd_line = false; 136 137 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 138 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 139 if (new_value == nullptr) { 140 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 141 return false; 142 } 143 if (_value != nullptr) { 144 FreeHeap(_value); 145 } 146 _value = new_value; 147 strcpy(_value, value); 148 return true; 149 } 150 151 void PathString::append_value(const char *value) { 152 char *sp; 153 size_t len = 0; 154 if (value != nullptr) { 155 len = strlen(value); 156 if (_value != nullptr) { 157 len += strlen(_value); 158 } 159 sp = AllocateHeap(len+2, mtArguments); 160 assert(sp != nullptr, "Unable to allocate space for new append path value"); 161 if (sp != nullptr) { 162 if (_value != nullptr) { 163 strcpy(sp, _value); 164 strcat(sp, os::path_separator()); 165 strcat(sp, value); 166 FreeHeap(_value); 167 } else { 168 strcpy(sp, value); 169 } 170 _value = sp; 171 } 172 } 173 } 174 175 PathString::PathString(const char* value) { 176 if (value == nullptr) { 177 _value = nullptr; 178 } else { 179 _value = AllocateHeap(strlen(value)+1, mtArguments); 180 strcpy(_value, value); 181 } 182 } 183 184 PathString::~PathString() { 185 if (_value != nullptr) { 186 FreeHeap(_value); 187 _value = nullptr; 188 } 189 } 190 191 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 192 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value"); 193 size_t len = strlen(module_name) + 1; 194 _module_name = AllocateHeap(len, mtInternal); 195 strncpy(_module_name, module_name, len); // copy the trailing null 196 _path = new PathString(path); 197 } 198 199 ModulePatchPath::~ModulePatchPath() { 200 if (_module_name != nullptr) { 201 FreeHeap(_module_name); 202 _module_name = nullptr; 203 } 204 if (_path != nullptr) { 205 delete _path; 206 _path = nullptr; 207 } 208 } 209 210 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 211 if (key == nullptr) { 212 _key = nullptr; 213 } else { 214 _key = AllocateHeap(strlen(key)+1, mtArguments); 215 strcpy(_key, key); 216 } 217 _next = nullptr; 218 _internal = internal; 219 _writeable = writeable; 220 } 221 222 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 223 // part of the option string. 224 static bool match_option(const JavaVMOption *option, const char* name, 225 const char** tail) { 226 size_t len = strlen(name); 227 if (strncmp(option->optionString, name, len) == 0) { 228 *tail = option->optionString + len; 229 return true; 230 } else { 231 return false; 232 } 233 } 234 235 // Check if 'option' matches 'name'. No "tail" is allowed. 236 static bool match_option(const JavaVMOption *option, const char* name) { 237 const char* tail = nullptr; 238 bool result = match_option(option, name, &tail); 239 if (tail != nullptr && *tail == '\0') { 240 return result; 241 } else { 242 return false; 243 } 244 } 245 246 // Return true if any of the strings in null-terminated array 'names' matches. 247 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 248 // the option must match exactly. 249 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 250 bool tail_allowed) { 251 for (/* empty */; *names != nullptr; ++names) { 252 if (match_option(option, *names, tail)) { 253 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 254 return true; 255 } 256 } 257 } 258 return false; 259 } 260 261 #if INCLUDE_JFR 262 static bool _has_jfr_option = false; // is using JFR 263 264 // return true on failure 265 static bool match_jfr_option(const JavaVMOption** option) { 266 assert((*option)->optionString != nullptr, "invariant"); 267 char* tail = nullptr; 268 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 269 _has_jfr_option = true; 270 return Jfr::on_start_flight_recording_option(option, tail); 271 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 272 _has_jfr_option = true; 273 return Jfr::on_flight_recorder_option(option, tail); 274 } 275 return false; 276 } 277 278 bool Arguments::has_jfr_option() { 279 return _has_jfr_option; 280 } 281 #endif 282 283 static void logOption(const char* opt) { 284 if (PrintVMOptions) { 285 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 286 } 287 } 288 289 bool needs_module_property_warning = false; 290 291 #define MODULE_PROPERTY_PREFIX "jdk.module." 292 #define MODULE_PROPERTY_PREFIX_LEN 11 293 #define ADDEXPORTS "addexports" 294 #define ADDEXPORTS_LEN 10 295 #define ADDREADS "addreads" 296 #define ADDREADS_LEN 8 297 #define ADDOPENS "addopens" 298 #define ADDOPENS_LEN 8 299 #define PATCH "patch" 300 #define PATCH_LEN 5 301 #define ADDMODS "addmods" 302 #define ADDMODS_LEN 7 303 #define LIMITMODS "limitmods" 304 #define LIMITMODS_LEN 9 305 #define PATH "path" 306 #define PATH_LEN 4 307 #define UPGRADE_PATH "upgrade.path" 308 #define UPGRADE_PATH_LEN 12 309 #define ENABLE_NATIVE_ACCESS "enable.native.access" 310 #define ENABLE_NATIVE_ACCESS_LEN 20 311 312 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 313 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 314 return ((strncmp(option, property, len) == 0) && 315 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 316 } 317 318 // Return true if property starts with "jdk.module." and its ensuing chars match 319 // any of the reserved module properties. 320 // property should be passed without the leading "-D". 321 bool Arguments::is_internal_module_property(const char* property) { 322 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 323 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 324 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 325 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 326 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 327 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 328 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 329 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 330 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 331 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 332 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 333 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 334 return true; 335 } 336 } 337 return false; 338 } 339 340 // Process java launcher properties. 341 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 342 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 343 // Must do this before setting up other system properties, 344 // as some of them may depend on launcher type. 345 for (int index = 0; index < args->nOptions; index++) { 346 const JavaVMOption* option = args->options + index; 347 const char* tail; 348 349 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 350 process_java_launcher_argument(tail, option->extraInfo); 351 continue; 352 } 353 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 354 if (strcmp(tail, "true") == 0) { 355 _sun_java_launcher_is_altjvm = true; 356 } 357 continue; 358 } 359 } 360 } 361 362 // Initialize system properties key and value. 363 void Arguments::init_system_properties() { 364 365 // Set up _boot_class_path which is not a property but 366 // relies heavily on argument processing and the jdk.boot.class.path.append 367 // property. It is used to store the underlying boot class path. 368 _boot_class_path = new PathString(nullptr); 369 370 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 371 "Java Virtual Machine Specification", false)); 372 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 373 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 374 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 375 376 // Initialize the vm.info now, but it will need updating after argument parsing. 377 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 378 379 // Following are JVMTI agent writable properties. 380 // Properties values are set to nullptr and they are 381 // os specific they are initialized in os::init_system_properties_values(). 382 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true); 383 _java_library_path = new SystemProperty("java.library.path", nullptr, true); 384 _java_home = new SystemProperty("java.home", nullptr, true); 385 _java_class_path = new SystemProperty("java.class.path", "", true); 386 // jdk.boot.class.path.append is a non-writeable, internal property. 387 // It can only be set by either: 388 // - -Xbootclasspath/a: 389 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 390 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true); 391 392 // Add to System Property list. 393 PropertyList_add(&_system_properties, _sun_boot_library_path); 394 PropertyList_add(&_system_properties, _java_library_path); 395 PropertyList_add(&_system_properties, _java_home); 396 PropertyList_add(&_system_properties, _java_class_path); 397 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 398 PropertyList_add(&_system_properties, _vm_info); 399 400 // Set OS specific system properties values 401 os::init_system_properties_values(); 402 } 403 404 // Update/Initialize System properties after JDK version number is known 405 void Arguments::init_version_specific_system_properties() { 406 enum { bufsz = 16 }; 407 char buffer[bufsz]; 408 const char* spec_vendor = "Oracle Corporation"; 409 uint32_t spec_version = JDK_Version::current().major_version(); 410 411 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 412 413 PropertyList_add(&_system_properties, 414 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 415 PropertyList_add(&_system_properties, 416 new SystemProperty("java.vm.specification.version", buffer, false)); 417 PropertyList_add(&_system_properties, 418 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 419 } 420 421 /* 422 * -XX argument processing: 423 * 424 * -XX arguments are defined in several places, such as: 425 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 426 * -XX arguments are parsed in parse_argument(). 427 * -XX argument bounds checking is done in check_vm_args_consistency(). 428 * 429 * Over time -XX arguments may change. There are mechanisms to handle common cases: 430 * 431 * ALIASED: An option that is simply another name for another option. This is often 432 * part of the process of deprecating a flag, but not all aliases need 433 * to be deprecated. 434 * 435 * Create an alias for an option by adding the old and new option names to the 436 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 437 * 438 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 439 * support may be removed in the future. Both regular and aliased options may be 440 * deprecated. 441 * 442 * Add a deprecation warning for an option (or alias) by adding an entry in the 443 * "special_jvm_flags" table and setting the "deprecated_in" field. 444 * Often an option "deprecated" in one major release will 445 * be made "obsolete" in the next. In this case the entry should also have its 446 * "obsolete_in" field set. 447 * 448 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 449 * on the command line. A warning is printed to let the user know that option might not 450 * be accepted in the future. 451 * 452 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 453 * table and setting the "obsolete_in" field. 454 * 455 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 456 * to the current JDK version. The system will flatly refuse to admit the existence of 457 * the flag. This allows a flag to die automatically over JDK releases. 458 * 459 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 460 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 461 * - Newly obsolete or expired deprecated options should have their global variable 462 * definitions removed (from globals.hpp, etc) and related implementations removed. 463 * 464 * Recommended approach for removing options: 465 * 466 * To remove options commonly used by customers (e.g. product -XX options), use 467 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 468 * 469 * To remove internal options (e.g. diagnostic, experimental, develop options), use 470 * a 2-step model adding major release numbers to the obsolete and expire columns. 471 * 472 * To change the name of an option, use the alias table as well as a 2-step 473 * model adding major release numbers to the deprecate and expire columns. 474 * Think twice about aliasing commonly used customer options. 475 * 476 * There are times when it is appropriate to leave a future release number as undefined. 477 * 478 * Tests: Aliases should be tested in VMAliasOptions.java. 479 * Deprecated options should be tested in VMDeprecatedOptions.java. 480 */ 481 482 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 483 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 484 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 485 // the command-line as usual, but will issue a warning. 486 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 487 // the command-line, while issuing a warning and ignoring the flag value. 488 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 489 // existence of the flag. 490 // 491 // MANUAL CLEANUP ON JDK VERSION UPDATES: 492 // This table ensures that the handling of options will update automatically when the JDK 493 // version is incremented, but the source code needs to be cleanup up manually: 494 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 495 // variable should be removed, as well as users of the variable. 496 // - As "deprecated" options age into "obsolete" options, move the entry into the 497 // "Obsolete Flags" section of the table. 498 // - All expired options should be removed from the table. 499 static SpecialFlag const special_jvm_flags[] = { 500 // -------------- Deprecated Flags -------------- 501 // --- Non-alias flags - sorted by obsolete_in then expired_in: 502 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 503 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 504 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 505 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 506 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 507 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 508 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 509 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 510 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 511 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 512 513 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 514 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 515 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 516 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 517 518 // -------------- Obsolete Flags - sorted by expired_in -------------- 519 520 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 521 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 522 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 523 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 524 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 525 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 526 527 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 528 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 529 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 530 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 531 { "DoReserveCopyInSuperWord", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) }, 532 { "UseCounterDecay", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) }, 533 534 #ifdef LINUX 535 { "UseHugeTLBFS", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) }, 536 { "UseSHM", JDK_Version::undefined(), JDK_Version::jdk(22), JDK_Version::jdk(23) }, 537 #endif 538 539 #ifdef ASSERT 540 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 541 #endif 542 543 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 544 // These entries will generate build errors. Their purpose is to test the macros. 545 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 546 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 547 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 548 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 549 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 550 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 551 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 552 #endif 553 554 { nullptr, JDK_Version(0), JDK_Version(0) } 555 }; 556 557 // Flags that are aliases for other flags. 558 typedef struct { 559 const char* alias_name; 560 const char* real_name; 561 } AliasedFlag; 562 563 static AliasedFlag const aliased_jvm_flags[] = { 564 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 565 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 566 { nullptr, nullptr} 567 }; 568 569 // Return true if "v" is less than "other", where "other" may be "undefined". 570 static bool version_less_than(JDK_Version v, JDK_Version other) { 571 assert(!v.is_undefined(), "must be defined"); 572 if (!other.is_undefined() && v.compare(other) >= 0) { 573 return false; 574 } else { 575 return true; 576 } 577 } 578 579 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 580 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 581 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 582 flag = special_jvm_flags[i]; 583 return true; 584 } 585 } 586 return false; 587 } 588 589 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 590 assert(version != nullptr, "Must provide a version buffer"); 591 SpecialFlag flag; 592 if (lookup_special_flag(flag_name, flag)) { 593 if (!flag.obsolete_in.is_undefined()) { 594 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 595 *version = flag.obsolete_in; 596 // This flag may have been marked for obsoletion in this version, but we may not 597 // have actually removed it yet. Rather than ignoring it as soon as we reach 598 // this version we allow some time for the removal to happen. So if the flag 599 // still actually exists we process it as normal, but issue an adjusted warning. 600 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 601 if (real_flag != nullptr) { 602 char version_str[256]; 603 version->to_string(version_str, sizeof(version_str)); 604 warning("Temporarily processing option %s; support is scheduled for removal in %s", 605 flag_name, version_str); 606 return false; 607 } 608 return true; 609 } 610 } 611 } 612 return false; 613 } 614 615 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 616 assert(version != nullptr, "Must provide a version buffer"); 617 SpecialFlag flag; 618 if (lookup_special_flag(flag_name, flag)) { 619 if (!flag.deprecated_in.is_undefined()) { 620 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 621 version_less_than(JDK_Version::current(), flag.expired_in)) { 622 *version = flag.deprecated_in; 623 return 1; 624 } else { 625 return -1; 626 } 627 } 628 } 629 return 0; 630 } 631 632 const char* Arguments::real_flag_name(const char *flag_name) { 633 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) { 634 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 635 if (strcmp(flag_status.alias_name, flag_name) == 0) { 636 return flag_status.real_name; 637 } 638 } 639 return flag_name; 640 } 641 642 #ifdef ASSERT 643 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 644 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 645 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 646 return true; 647 } 648 } 649 return false; 650 } 651 652 // Verifies the correctness of the entries in the special_jvm_flags table. 653 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 654 // version being earlier than the deprecation version, then a warning is issued 655 // and verification fails - by returning false. If it is detected that the table 656 // is out of date, with respect to the current version, then ideally a warning is 657 // issued but verification does not fail. This allows the VM to operate when the 658 // version is first updated, without needing to update all the impacted flags at 659 // the same time. In practice we can't issue the warning immediately when the version 660 // is updated as it occurs for every test and some tests are not prepared to handle 661 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 662 // if the check_globals flag is true, and in addition allow a grace period and only 663 // check for stale flags when we hit build 25 (which is far enough into the 6 month 664 // release cycle that all flag updates should have been processed, whilst still 665 // leaving time to make the change before RDP2). 666 // We use a gtest to call this, passing true, so that we can detect stale flags before 667 // the end of the release cycle. 668 669 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 670 671 bool Arguments::verify_special_jvm_flags(bool check_globals) { 672 bool success = true; 673 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 674 const SpecialFlag& flag = special_jvm_flags[i]; 675 if (lookup_special_flag(flag.name, i)) { 676 warning("Duplicate special flag declaration \"%s\"", flag.name); 677 success = false; 678 } 679 if (flag.deprecated_in.is_undefined() && 680 flag.obsolete_in.is_undefined()) { 681 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 682 success = false; 683 } 684 685 if (!flag.deprecated_in.is_undefined()) { 686 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 687 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 688 success = false; 689 } 690 691 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 692 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 693 success = false; 694 } 695 } 696 697 if (!flag.obsolete_in.is_undefined()) { 698 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 699 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 700 success = false; 701 } 702 703 // if flag has become obsolete it should not have a "globals" flag defined anymore. 704 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 705 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 706 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 707 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 708 success = false; 709 } 710 } 711 712 } else if (!flag.expired_in.is_undefined()) { 713 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 714 success = false; 715 } 716 717 if (!flag.expired_in.is_undefined()) { 718 // if flag has become expired it should not have a "globals" flag defined anymore. 719 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 720 !version_less_than(JDK_Version::current(), flag.expired_in)) { 721 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 722 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 723 success = false; 724 } 725 } 726 } 727 } 728 return success; 729 } 730 #endif 731 732 bool Arguments::atojulong(const char *s, julong* result) { 733 return parse_integer(s, result); 734 } 735 736 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 737 if (size < min_size) return arg_too_small; 738 if (size > max_size) return arg_too_big; 739 return arg_in_range; 740 } 741 742 // Describe an argument out of range error 743 void Arguments::describe_range_error(ArgsRange errcode) { 744 switch(errcode) { 745 case arg_too_big: 746 jio_fprintf(defaultStream::error_stream(), 747 "The specified size exceeds the maximum " 748 "representable size.\n"); 749 break; 750 case arg_too_small: 751 case arg_unreadable: 752 case arg_in_range: 753 // do nothing for now 754 break; 755 default: 756 ShouldNotReachHere(); 757 } 758 } 759 760 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 761 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 762 return true; 763 } else { 764 return false; 765 } 766 } 767 768 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 769 // strtod allows leading whitespace, but our flag format does not. 770 if (*value == '\0' || isspace(*value)) { 771 return false; 772 } 773 char* end; 774 errno = 0; 775 double v = strtod(value, &end); 776 if ((errno != 0) || (*end != 0)) { 777 return false; 778 } 779 if (g_isnan(v) || !g_isfinite(v)) { 780 // Currently we cannot handle these special values. 781 return false; 782 } 783 784 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 785 return true; 786 } 787 return false; 788 } 789 790 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 791 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 792 793 if (flag->is_int()) { 794 int v; 795 if (parse_integer(value, &v)) { 796 result = JVMFlagAccess::set_int(flag, &v, origin); 797 } 798 } else if (flag->is_uint()) { 799 uint v; 800 if (parse_integer(value, &v)) { 801 result = JVMFlagAccess::set_uint(flag, &v, origin); 802 } 803 } else if (flag->is_intx()) { 804 intx v; 805 if (parse_integer(value, &v)) { 806 result = JVMFlagAccess::set_intx(flag, &v, origin); 807 } 808 } else if (flag->is_uintx()) { 809 uintx v; 810 if (parse_integer(value, &v)) { 811 result = JVMFlagAccess::set_uintx(flag, &v, origin); 812 } 813 } else if (flag->is_uint64_t()) { 814 uint64_t v; 815 if (parse_integer(value, &v)) { 816 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 817 } 818 } else if (flag->is_size_t()) { 819 size_t v; 820 if (parse_integer(value, &v)) { 821 result = JVMFlagAccess::set_size_t(flag, &v, origin); 822 } 823 } 824 825 return result == JVMFlag::SUCCESS; 826 } 827 828 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 829 if (value[0] == '\0') { 830 value = nullptr; 831 } 832 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 833 // Contract: JVMFlag always returns a pointer that needs freeing. 834 FREE_C_HEAP_ARRAY(char, value); 835 return true; 836 } 837 838 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 839 const char* old_value = ""; 840 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 841 size_t old_len = old_value != nullptr ? strlen(old_value) : 0; 842 size_t new_len = strlen(new_value); 843 const char* value; 844 char* free_this_too = nullptr; 845 if (old_len == 0) { 846 value = new_value; 847 } else if (new_len == 0) { 848 value = old_value; 849 } else { 850 size_t length = old_len + 1 + new_len + 1; 851 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 852 // each new setting adds another LINE to the switch: 853 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 854 value = buf; 855 free_this_too = buf; 856 } 857 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 858 // JVMFlag always returns a pointer that needs freeing. 859 FREE_C_HEAP_ARRAY(char, value); 860 // JVMFlag made its own copy, so I must delete my own temp. buffer. 861 FREE_C_HEAP_ARRAY(char, free_this_too); 862 return true; 863 } 864 865 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 866 const char* real_name = real_flag_name(arg); 867 JDK_Version since = JDK_Version(); 868 switch (is_deprecated_flag(arg, &since)) { 869 case -1: { 870 // Obsolete or expired, so don't process normally, 871 // but allow for an obsolete flag we're still 872 // temporarily allowing. 873 if (!is_obsolete_flag(arg, &since)) { 874 return real_name; 875 } 876 // Note if we're not considered obsolete then we can't be expired either 877 // as obsoletion must come first. 878 return nullptr; 879 } 880 case 0: 881 return real_name; 882 case 1: { 883 char version[256]; 884 since.to_string(version, sizeof(version)); 885 if (real_name != arg) { 886 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 887 arg, version, real_name); 888 } else { 889 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 890 arg, version); 891 } 892 return real_name; 893 } 894 } 895 ShouldNotReachHere(); 896 return nullptr; 897 } 898 899 #define BUFLEN 255 900 901 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 902 char name_copied[BUFLEN+1]; 903 if (name[name_length] != 0) { 904 if (name_length > BUFLEN) { 905 return nullptr; 906 } else { 907 strncpy(name_copied, name, name_length); 908 name_copied[name_length] = '\0'; 909 name = name_copied; 910 } 911 } 912 913 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 914 if (real_name == nullptr) { 915 return nullptr; 916 } 917 JVMFlag* flag = JVMFlag::find_flag(real_name); 918 return flag; 919 } 920 921 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 922 bool is_bool = false; 923 bool bool_val = false; 924 char c = *arg; 925 if (c == '+' || c == '-') { 926 is_bool = true; 927 bool_val = (c == '+'); 928 arg++; 929 } 930 931 const char* name = arg; 932 while (true) { 933 c = *arg; 934 if (isalnum(c) || (c == '_')) { 935 ++arg; 936 } else { 937 break; 938 } 939 } 940 941 size_t name_len = size_t(arg - name); 942 if (name_len == 0) { 943 return false; 944 } 945 946 JVMFlag* flag = find_jvm_flag(name, name_len); 947 if (flag == nullptr) { 948 return false; 949 } 950 951 if (is_bool) { 952 if (*arg != 0) { 953 // Error -- extra characters such as -XX:+BoolFlag=123 954 return false; 955 } 956 return set_bool_flag(flag, bool_val, origin); 957 } 958 959 if (arg[0] == '=') { 960 const char* value = arg + 1; 961 if (flag->is_ccstr()) { 962 if (flag->ccstr_accumulates()) { 963 return append_to_string_flag(flag, value, origin); 964 } else { 965 return set_string_flag(flag, value, origin); 966 } 967 } else if (flag->is_double()) { 968 return set_fp_numeric_flag(flag, value, origin); 969 } else { 970 return set_numeric_flag(flag, value, origin); 971 } 972 } 973 974 if (arg[0] == ':' && arg[1] == '=') { 975 // -XX:Foo:=xxx will reset the string flag to the given value. 976 const char* value = arg + 2; 977 return set_string_flag(flag, value, origin); 978 } 979 980 return false; 981 } 982 983 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 984 assert(bldarray != nullptr, "illegal argument"); 985 986 if (arg == nullptr) { 987 return; 988 } 989 990 int new_count = *count + 1; 991 992 // expand the array and add arg to the last element 993 if (*bldarray == nullptr) { 994 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 995 } else { 996 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 997 } 998 (*bldarray)[*count] = os::strdup_check_oom(arg); 999 *count = new_count; 1000 } 1001 1002 void Arguments::build_jvm_args(const char* arg) { 1003 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1004 } 1005 1006 void Arguments::build_jvm_flags(const char* arg) { 1007 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1008 } 1009 1010 // utility function to return a string that concatenates all 1011 // strings in a given char** array 1012 const char* Arguments::build_resource_string(char** args, int count) { 1013 if (args == nullptr || count == 0) { 1014 return nullptr; 1015 } 1016 size_t length = 0; 1017 for (int i = 0; i < count; i++) { 1018 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character 1019 } 1020 char* s = NEW_RESOURCE_ARRAY(char, length); 1021 char* dst = s; 1022 for (int j = 0; j < count; j++) { 1023 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character 1024 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character 1025 dst += offset; 1026 length -= offset; 1027 } 1028 return (const char*) s; 1029 } 1030 1031 void Arguments::print_on(outputStream* st) { 1032 st->print_cr("VM Arguments:"); 1033 if (num_jvm_flags() > 0) { 1034 st->print("jvm_flags: "); print_jvm_flags_on(st); 1035 st->cr(); 1036 } 1037 if (num_jvm_args() > 0) { 1038 st->print("jvm_args: "); print_jvm_args_on(st); 1039 st->cr(); 1040 } 1041 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1042 if (_java_class_path != nullptr) { 1043 char* path = _java_class_path->value(); 1044 size_t len = strlen(path); 1045 st->print("java_class_path (initial): "); 1046 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1047 if (len == 0) { 1048 st->print_raw_cr("<not set>"); 1049 } else { 1050 st->print_raw_cr(path, len); 1051 } 1052 } 1053 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1054 } 1055 1056 void Arguments::print_summary_on(outputStream* st) { 1057 // Print the command line. Environment variables that are helpful for 1058 // reproducing the problem are written later in the hs_err file. 1059 // flags are from setting file 1060 if (num_jvm_flags() > 0) { 1061 st->print_raw("Settings File: "); 1062 print_jvm_flags_on(st); 1063 st->cr(); 1064 } 1065 // args are the command line and environment variable arguments. 1066 st->print_raw("Command Line: "); 1067 if (num_jvm_args() > 0) { 1068 print_jvm_args_on(st); 1069 } 1070 // this is the classfile and any arguments to the java program 1071 if (java_command() != nullptr) { 1072 st->print("%s", java_command()); 1073 } 1074 st->cr(); 1075 } 1076 1077 void Arguments::print_jvm_flags_on(outputStream* st) { 1078 if (_num_jvm_flags > 0) { 1079 for (int i=0; i < _num_jvm_flags; i++) { 1080 st->print("%s ", _jvm_flags_array[i]); 1081 } 1082 } 1083 } 1084 1085 void Arguments::print_jvm_args_on(outputStream* st) { 1086 if (_num_jvm_args > 0) { 1087 for (int i=0; i < _num_jvm_args; i++) { 1088 st->print("%s ", _jvm_args_array[i]); 1089 } 1090 } 1091 } 1092 1093 bool Arguments::process_argument(const char* arg, 1094 jboolean ignore_unrecognized, 1095 JVMFlagOrigin origin) { 1096 JDK_Version since = JDK_Version(); 1097 1098 if (parse_argument(arg, origin)) { 1099 return true; 1100 } 1101 1102 // Determine if the flag has '+', '-', or '=' characters. 1103 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1104 const char* const argname = has_plus_minus ? arg + 1 : arg; 1105 1106 size_t arg_len; 1107 const char* equal_sign = strchr(argname, '='); 1108 if (equal_sign == nullptr) { 1109 arg_len = strlen(argname); 1110 } else { 1111 arg_len = equal_sign - argname; 1112 } 1113 1114 // Only make the obsolete check for valid arguments. 1115 if (arg_len <= BUFLEN) { 1116 // Construct a string which consists only of the argument name without '+', '-', or '='. 1117 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1118 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1119 if (is_obsolete_flag(stripped_argname, &since)) { 1120 char version[256]; 1121 since.to_string(version, sizeof(version)); 1122 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1123 return true; 1124 } 1125 } 1126 1127 // For locked flags, report a custom error message if available. 1128 // Otherwise, report the standard unrecognized VM option. 1129 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1130 if (found_flag != nullptr) { 1131 char locked_message_buf[BUFLEN]; 1132 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1133 if (strlen(locked_message_buf) == 0) { 1134 if (found_flag->is_bool() && !has_plus_minus) { 1135 jio_fprintf(defaultStream::error_stream(), 1136 "Missing +/- setting for VM option '%s'\n", argname); 1137 } else if (!found_flag->is_bool() && has_plus_minus) { 1138 jio_fprintf(defaultStream::error_stream(), 1139 "Unexpected +/- setting in VM option '%s'\n", argname); 1140 } else { 1141 jio_fprintf(defaultStream::error_stream(), 1142 "Improperly specified VM option '%s'\n", argname); 1143 } 1144 } else { 1145 #ifdef PRODUCT 1146 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1147 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1148 if (ignore_unrecognized && mismatched) { 1149 return true; 1150 } 1151 #endif 1152 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1153 } 1154 } else { 1155 if (ignore_unrecognized) { 1156 return true; 1157 } 1158 jio_fprintf(defaultStream::error_stream(), 1159 "Unrecognized VM option '%s'\n", argname); 1160 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1161 if (fuzzy_matched != nullptr) { 1162 jio_fprintf(defaultStream::error_stream(), 1163 "Did you mean '%s%s%s'?\n", 1164 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1165 fuzzy_matched->name(), 1166 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1167 } 1168 } 1169 1170 // allow for commandline "commenting out" options like -XX:#+Verbose 1171 return arg[0] == '#'; 1172 } 1173 1174 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1175 FILE* stream = os::fopen(file_name, "rb"); 1176 if (stream == nullptr) { 1177 if (should_exist) { 1178 jio_fprintf(defaultStream::error_stream(), 1179 "Could not open settings file %s\n", file_name); 1180 return false; 1181 } else { 1182 return true; 1183 } 1184 } 1185 1186 char token[1024]; 1187 int pos = 0; 1188 1189 bool in_white_space = true; 1190 bool in_comment = false; 1191 bool in_quote = false; 1192 int quote_c = 0; 1193 bool result = true; 1194 1195 int c = getc(stream); 1196 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1197 if (in_white_space) { 1198 if (in_comment) { 1199 if (c == '\n') in_comment = false; 1200 } else { 1201 if (c == '#') in_comment = true; 1202 else if (!isspace(c)) { 1203 in_white_space = false; 1204 token[pos++] = checked_cast<char>(c); 1205 } 1206 } 1207 } else { 1208 if (c == '\n' || (!in_quote && isspace(c))) { 1209 // token ends at newline, or at unquoted whitespace 1210 // this allows a way to include spaces in string-valued options 1211 token[pos] = '\0'; 1212 logOption(token); 1213 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1214 build_jvm_flags(token); 1215 pos = 0; 1216 in_white_space = true; 1217 in_quote = false; 1218 } else if (!in_quote && (c == '\'' || c == '"')) { 1219 in_quote = true; 1220 quote_c = c; 1221 } else if (in_quote && (c == quote_c)) { 1222 in_quote = false; 1223 } else { 1224 token[pos++] = checked_cast<char>(c); 1225 } 1226 } 1227 c = getc(stream); 1228 } 1229 if (pos > 0) { 1230 token[pos] = '\0'; 1231 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1232 build_jvm_flags(token); 1233 } 1234 fclose(stream); 1235 return result; 1236 } 1237 1238 //============================================================================================================= 1239 // Parsing of properties (-D) 1240 1241 const char* Arguments::get_property(const char* key) { 1242 return PropertyList_get_value(system_properties(), key); 1243 } 1244 1245 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1246 const char* eq = strchr(prop, '='); 1247 const char* key; 1248 const char* value = ""; 1249 1250 if (eq == nullptr) { 1251 // property doesn't have a value, thus use passed string 1252 key = prop; 1253 } else { 1254 // property have a value, thus extract it and save to the 1255 // allocated string 1256 size_t key_len = eq - prop; 1257 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1258 1259 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1260 key = tmp_key; 1261 1262 value = &prop[key_len + 1]; 1263 } 1264 1265 #if INCLUDE_CDS 1266 if (is_internal_module_property(key)) { 1267 MetaspaceShared::disable_optimized_module_handling(); 1268 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value); 1269 } 1270 if (strcmp(key, "jdk.module.showModuleResolution") == 0 || 1271 strcmp(key, "jdk.module.validation") == 0 || 1272 strcmp(key, "java.system.class.loader") == 0) { 1273 CDSConfig::disable_loading_full_module_graph(); 1274 CDSConfig::disable_dumping_full_module_graph(); 1275 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value); 1276 } 1277 #endif 1278 1279 if (strcmp(key, "java.compiler") == 0) { 1280 // we no longer support java.compiler system property, log a warning and let it get 1281 // passed to Java, like any other system property 1282 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) { 1283 // for applications using NONE or empty value, log a more informative message 1284 warning("The java.compiler system property is obsolete and no longer supported, use -Xint"); 1285 } else { 1286 warning("The java.compiler system property is obsolete and no longer supported."); 1287 } 1288 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1289 // sun.java.launcher.is_altjvm property is 1290 // private and is processed in process_sun_java_launcher_properties(); 1291 // the sun.java.launcher property is passed on to the java application 1292 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1293 // append is true, writable is true, internal is false 1294 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1295 WriteableProperty, ExternalProperty); 1296 } else { 1297 if (strcmp(key, "sun.java.command") == 0) { 1298 char *old_java_command = _java_command; 1299 _java_command = os::strdup_check_oom(value, mtArguments); 1300 if (old_java_command != nullptr) { 1301 os::free(old_java_command); 1302 } 1303 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1304 // If this property is set on the command line then its value will be 1305 // displayed in VM error logs as the URL at which to submit such logs. 1306 // Normally the URL displayed in error logs is different from the value 1307 // of this system property, so a different property should have been 1308 // used here, but we leave this as-is in case someone depends upon it. 1309 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1310 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1311 // its value without going through the property list or making a Java call. 1312 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1313 if (old_java_vendor_url_bug != nullptr) { 1314 os::free((void *)old_java_vendor_url_bug); 1315 } 1316 } 1317 1318 // Create new property and add at the end of the list 1319 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1320 } 1321 1322 if (key != prop) { 1323 // SystemProperty copy passed value, thus free previously allocated 1324 // memory 1325 FreeHeap((void *)key); 1326 } 1327 1328 return true; 1329 } 1330 1331 #if INCLUDE_CDS 1332 const char* unsupported_properties[] = { "jdk.module.limitmods", 1333 "jdk.module.upgrade.path", 1334 "jdk.module.patch.0" }; 1335 const char* unsupported_options[] = { "--limit-modules", 1336 "--upgrade-module-path", 1337 "--patch-module" 1338 }; 1339 void Arguments::check_unsupported_dumping_properties() { 1340 assert(CDSConfig::is_dumping_archive(), 1341 "this function is only used with CDS dump time"); 1342 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1343 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1344 SystemProperty* sp = system_properties(); 1345 while (sp != nullptr) { 1346 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1347 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1348 vm_exit_during_initialization( 1349 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1350 } 1351 } 1352 sp = sp->next(); 1353 } 1354 1355 // Check for an exploded module build in use with -Xshare:dump. 1356 if (!has_jimage()) { 1357 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1358 } 1359 } 1360 1361 bool Arguments::check_unsupported_cds_runtime_properties() { 1362 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1363 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1364 if (ArchiveClassesAtExit != nullptr) { 1365 // dynamic dumping, just return false for now. 1366 // check_unsupported_dumping_properties() will be called later to check the same set of 1367 // properties, and will exit the VM with the correct error message if the unsupported properties 1368 // are used. 1369 return false; 1370 } 1371 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1372 if (get_property(unsupported_properties[i]) != nullptr) { 1373 if (RequireSharedSpaces) { 1374 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1375 } else { 1376 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1377 } 1378 return true; 1379 } 1380 } 1381 return false; 1382 } 1383 #endif 1384 1385 //=========================================================================================================== 1386 // Setting int/mixed/comp mode flags 1387 1388 void Arguments::set_mode_flags(Mode mode) { 1389 // Set up default values for all flags. 1390 // If you add a flag to any of the branches below, 1391 // add a default value for it here. 1392 _mode = mode; 1393 1394 // Ensure Agent_OnLoad has the correct initial values. 1395 // This may not be the final mode; mode may change later in onload phase. 1396 PropertyList_unique_add(&_system_properties, "java.vm.info", 1397 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1398 1399 UseInterpreter = true; 1400 UseCompiler = true; 1401 UseLoopCounter = true; 1402 1403 // Default values may be platform/compiler dependent - 1404 // use the saved values 1405 ClipInlining = Arguments::_ClipInlining; 1406 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1407 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1408 BackgroundCompilation = Arguments::_BackgroundCompilation; 1409 1410 // Change from defaults based on mode 1411 switch (mode) { 1412 default: 1413 ShouldNotReachHere(); 1414 break; 1415 case _int: 1416 UseCompiler = false; 1417 UseLoopCounter = false; 1418 AlwaysCompileLoopMethods = false; 1419 UseOnStackReplacement = false; 1420 break; 1421 case _mixed: 1422 // same as default 1423 break; 1424 case _comp: 1425 UseInterpreter = false; 1426 BackgroundCompilation = false; 1427 ClipInlining = false; 1428 break; 1429 } 1430 } 1431 1432 // Conflict: required to use shared spaces (-Xshare:on), but 1433 // incompatible command line options were chosen. 1434 static void no_shared_spaces(const char* message) { 1435 if (RequireSharedSpaces) { 1436 jio_fprintf(defaultStream::error_stream(), 1437 "Class data sharing is inconsistent with other specified options.\n"); 1438 vm_exit_during_initialization("Unable to use shared archive", message); 1439 } else { 1440 log_info(cds)("Unable to use shared archive: %s", message); 1441 UseSharedSpaces = false; 1442 } 1443 } 1444 1445 void set_object_alignment() { 1446 // Object alignment. 1447 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1448 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1449 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1450 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1451 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1452 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1453 1454 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1455 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1456 1457 // Oop encoding heap max 1458 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1459 } 1460 1461 size_t Arguments::max_heap_for_compressed_oops() { 1462 // Avoid sign flip. 1463 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1464 // We need to fit both the null page and the heap into the memory budget, while 1465 // keeping alignment constraints of the heap. To guarantee the latter, as the 1466 // null page is located before the heap, we pad the null page to the conservative 1467 // maximum alignment that the GC may ever impose upon the heap. 1468 size_t displacement_due_to_null_page = align_up(os::vm_page_size(), 1469 _conservative_max_heap_alignment); 1470 1471 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1472 NOT_LP64(ShouldNotReachHere(); return 0); 1473 } 1474 1475 void Arguments::set_use_compressed_oops() { 1476 #ifdef _LP64 1477 // MaxHeapSize is not set up properly at this point, but 1478 // the only value that can override MaxHeapSize if we are 1479 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1480 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1481 1482 if (max_heap_size <= max_heap_for_compressed_oops()) { 1483 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1484 FLAG_SET_ERGO(UseCompressedOops, true); 1485 } 1486 } else { 1487 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1488 warning("Max heap size too large for Compressed Oops"); 1489 FLAG_SET_DEFAULT(UseCompressedOops, false); 1490 } 1491 } 1492 #endif // _LP64 1493 } 1494 1495 void Arguments::set_use_compressed_klass_ptrs() { 1496 #ifdef _LP64 1497 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax, 1498 "CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1499 #endif // _LP64 1500 } 1501 1502 void Arguments::set_conservative_max_heap_alignment() { 1503 // The conservative maximum required alignment for the heap is the maximum of 1504 // the alignments imposed by several sources: any requirements from the heap 1505 // itself and the maximum page size we may run the VM with. 1506 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1507 _conservative_max_heap_alignment = MAX4(heap_alignment, 1508 os::vm_allocation_granularity(), 1509 os::max_page_size(), 1510 GCArguments::compute_heap_alignment()); 1511 } 1512 1513 jint Arguments::set_ergonomics_flags() { 1514 GCConfig::initialize(); 1515 1516 set_conservative_max_heap_alignment(); 1517 1518 #ifdef _LP64 1519 set_use_compressed_oops(); 1520 set_use_compressed_klass_ptrs(); 1521 1522 // Also checks that certain machines are slower with compressed oops 1523 // in vm_version initialization code. 1524 #endif // _LP64 1525 1526 return JNI_OK; 1527 } 1528 1529 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1530 size_t max_allocatable; 1531 size_t result = limit; 1532 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1533 // The AggressiveHeap check is a temporary workaround to avoid calling 1534 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1535 // selected. This works because AggressiveHeap implies UseParallelGC 1536 // where we know the ratio will be 1. Once the AggressiveHeap option is 1537 // removed, this can be cleaned up. 1538 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1539 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1540 result = MIN2(result, max_allocatable / fraction); 1541 } 1542 return result; 1543 } 1544 1545 // Use static initialization to get the default before parsing 1546 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1547 1548 void Arguments::set_heap_size() { 1549 julong phys_mem; 1550 1551 // If the user specified one of these options, they 1552 // want specific memory sizing so do not limit memory 1553 // based on compressed oops addressability. 1554 // Also, memory limits will be calculated based on 1555 // available os physical memory, not our MaxRAM limit, 1556 // unless MaxRAM is also specified. 1557 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1558 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1559 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1560 !FLAG_IS_DEFAULT(MinRAMFraction) || 1561 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1562 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1563 !FLAG_IS_DEFAULT(MaxRAM)); 1564 if (override_coop_limit) { 1565 if (FLAG_IS_DEFAULT(MaxRAM)) { 1566 phys_mem = os::physical_memory(); 1567 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1568 } else { 1569 phys_mem = (julong)MaxRAM; 1570 } 1571 } else { 1572 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1573 : (julong)MaxRAM; 1574 } 1575 1576 1577 // Convert deprecated flags 1578 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1579 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1580 MaxRAMPercentage = 100.0 / (double)MaxRAMFraction; 1581 1582 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1583 !FLAG_IS_DEFAULT(MinRAMFraction)) 1584 MinRAMPercentage = 100.0 / (double)MinRAMFraction; 1585 1586 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1587 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1588 InitialRAMPercentage = 100.0 / (double)InitialRAMFraction; 1589 1590 // If the maximum heap size has not been set with -Xmx, 1591 // then set it as fraction of the size of physical memory, 1592 // respecting the maximum and minimum sizes of the heap. 1593 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1594 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100); 1595 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100); 1596 if (reasonable_min < MaxHeapSize) { 1597 // Small physical memory, so use a minimum fraction of it for the heap 1598 reasonable_max = reasonable_min; 1599 } else { 1600 // Not-small physical memory, so require a heap at least 1601 // as large as MaxHeapSize 1602 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1603 } 1604 1605 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1606 // Limit the heap size to ErgoHeapSizeLimit 1607 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1608 } 1609 1610 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1611 1612 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1613 // An initial heap size was specified on the command line, 1614 // so be sure that the maximum size is consistent. Done 1615 // after call to limit_heap_by_allocatable_memory because that 1616 // method might reduce the allocation size. 1617 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1618 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1619 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1620 } 1621 1622 #ifdef _LP64 1623 if (UseCompressedOops || UseCompressedClassPointers) { 1624 // HeapBaseMinAddress can be greater than default but not less than. 1625 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1626 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1627 // matches compressed oops printing flags 1628 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1629 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1630 DefaultHeapBaseMinAddress, 1631 DefaultHeapBaseMinAddress/G, 1632 HeapBaseMinAddress); 1633 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1634 } 1635 } 1636 } 1637 if (UseCompressedOops) { 1638 // Limit the heap size to the maximum possible when using compressed oops 1639 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1640 1641 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1642 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1643 // but it should be not less than default MaxHeapSize. 1644 max_coop_heap -= HeapBaseMinAddress; 1645 } 1646 1647 // If user specified flags prioritizing os physical 1648 // memory limits, then disable compressed oops if 1649 // limits exceed max_coop_heap and UseCompressedOops 1650 // was not specified. 1651 if (reasonable_max > max_coop_heap) { 1652 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1653 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1654 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1655 "Please check the setting of MaxRAMPercentage %5.2f." 1656 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1657 FLAG_SET_ERGO(UseCompressedOops, false); 1658 } else { 1659 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1660 } 1661 } 1662 } 1663 #endif // _LP64 1664 1665 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1666 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1667 } 1668 1669 // If the minimum or initial heap_size have not been set or requested to be set 1670 // ergonomically, set them accordingly. 1671 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1672 julong reasonable_minimum = (julong)(OldSize + NewSize); 1673 1674 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1675 1676 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1677 1678 if (InitialHeapSize == 0) { 1679 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100); 1680 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1681 1682 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1683 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1684 1685 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1686 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1687 } 1688 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1689 // synchronize with InitialHeapSize to avoid errors with the default value. 1690 if (MinHeapSize == 0) { 1691 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1692 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1693 } 1694 } 1695 } 1696 1697 // This option inspects the machine and attempts to set various 1698 // parameters to be optimal for long-running, memory allocation 1699 // intensive jobs. It is intended for machines with large 1700 // amounts of cpu and memory. 1701 jint Arguments::set_aggressive_heap_flags() { 1702 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1703 // VM, but we may not be able to represent the total physical memory 1704 // available (like having 8gb of memory on a box but using a 32bit VM). 1705 // Thus, we need to make sure we're using a julong for intermediate 1706 // calculations. 1707 julong initHeapSize; 1708 julong total_memory = os::physical_memory(); 1709 1710 if (total_memory < (julong) 256 * M) { 1711 jio_fprintf(defaultStream::error_stream(), 1712 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1713 vm_exit(1); 1714 } 1715 1716 // The heap size is half of available memory, or (at most) 1717 // all of possible memory less 160mb (leaving room for the OS 1718 // when using ISM). This is the maximum; because adaptive sizing 1719 // is turned on below, the actual space used may be smaller. 1720 1721 initHeapSize = MIN2(total_memory / (julong) 2, 1722 total_memory - (julong) 160 * M); 1723 1724 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1725 1726 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1727 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1728 return JNI_EINVAL; 1729 } 1730 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1731 return JNI_EINVAL; 1732 } 1733 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1734 return JNI_EINVAL; 1735 } 1736 } 1737 if (FLAG_IS_DEFAULT(NewSize)) { 1738 // Make the young generation 3/8ths of the total heap. 1739 if (FLAG_SET_CMDLINE(NewSize, 1740 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1741 return JNI_EINVAL; 1742 } 1743 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1744 return JNI_EINVAL; 1745 } 1746 } 1747 1748 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1749 FLAG_SET_DEFAULT(UseLargePages, true); 1750 #endif 1751 1752 // Increase some data structure sizes for efficiency 1753 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1754 return JNI_EINVAL; 1755 } 1756 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1757 return JNI_EINVAL; 1758 } 1759 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1760 return JNI_EINVAL; 1761 } 1762 1763 // See the OldPLABSize comment below, but replace 'after promotion' 1764 // with 'after copying'. YoungPLABSize is the size of the survivor 1765 // space per-gc-thread buffers. The default is 4kw. 1766 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1767 return JNI_EINVAL; 1768 } 1769 1770 // OldPLABSize is the size of the buffers in the old gen that 1771 // UseParallelGC uses to promote live data that doesn't fit in the 1772 // survivor spaces. At any given time, there's one for each gc thread. 1773 // The default size is 1kw. These buffers are rarely used, since the 1774 // survivor spaces are usually big enough. For specjbb, however, there 1775 // are occasions when there's lots of live data in the young gen 1776 // and we end up promoting some of it. We don't have a definite 1777 // explanation for why bumping OldPLABSize helps, but the theory 1778 // is that a bigger PLAB results in retaining something like the 1779 // original allocation order after promotion, which improves mutator 1780 // locality. A minor effect may be that larger PLABs reduce the 1781 // number of PLAB allocation events during gc. The value of 8kw 1782 // was arrived at by experimenting with specjbb. 1783 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1784 return JNI_EINVAL; 1785 } 1786 1787 // Enable parallel GC and adaptive generation sizing 1788 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1789 return JNI_EINVAL; 1790 } 1791 1792 // Encourage steady state memory management 1793 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1794 return JNI_EINVAL; 1795 } 1796 1797 // This appears to improve mutator locality 1798 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1799 return JNI_EINVAL; 1800 } 1801 1802 return JNI_OK; 1803 } 1804 1805 // This must be called after ergonomics. 1806 void Arguments::set_bytecode_flags() { 1807 if (!RewriteBytecodes) { 1808 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1809 } 1810 } 1811 1812 // Aggressive optimization flags 1813 jint Arguments::set_aggressive_opts_flags() { 1814 #ifdef COMPILER2 1815 if (AggressiveUnboxing) { 1816 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1817 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1818 } else if (!EliminateAutoBox) { 1819 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1820 AggressiveUnboxing = false; 1821 } 1822 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1823 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1824 } else if (!DoEscapeAnalysis) { 1825 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1826 AggressiveUnboxing = false; 1827 } 1828 } 1829 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1830 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1831 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1832 } 1833 // Feed the cache size setting into the JDK 1834 char buffer[1024]; 1835 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1836 if (!add_property(buffer)) { 1837 return JNI_ENOMEM; 1838 } 1839 } 1840 #endif 1841 1842 return JNI_OK; 1843 } 1844 1845 //=========================================================================================================== 1846 1847 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1848 if (_sun_java_launcher != _default_java_launcher) { 1849 os::free(const_cast<char*>(_sun_java_launcher)); 1850 } 1851 _sun_java_launcher = os::strdup_check_oom(launcher); 1852 } 1853 1854 bool Arguments::created_by_java_launcher() { 1855 assert(_sun_java_launcher != nullptr, "property must have value"); 1856 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1857 } 1858 1859 bool Arguments::sun_java_launcher_is_altjvm() { 1860 return _sun_java_launcher_is_altjvm; 1861 } 1862 1863 //=========================================================================================================== 1864 // Parsing of main arguments 1865 1866 unsigned int addreads_count = 0; 1867 unsigned int addexports_count = 0; 1868 unsigned int addopens_count = 0; 1869 unsigned int addmods_count = 0; 1870 unsigned int patch_mod_count = 0; 1871 unsigned int enable_native_access_count = 0; 1872 1873 // Check the consistency of vm_init_args 1874 bool Arguments::check_vm_args_consistency() { 1875 // Method for adding checks for flag consistency. 1876 // The intent is to warn the user of all possible conflicts, 1877 // before returning an error. 1878 // Note: Needs platform-dependent factoring. 1879 bool status = true; 1880 1881 if (TLABRefillWasteFraction == 0) { 1882 jio_fprintf(defaultStream::error_stream(), 1883 "TLABRefillWasteFraction should be a denominator, " 1884 "not " SIZE_FORMAT "\n", 1885 TLABRefillWasteFraction); 1886 status = false; 1887 } 1888 1889 status = CompilerConfig::check_args_consistency(status); 1890 #if INCLUDE_JVMCI 1891 if (status && EnableJVMCI) { 1892 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 1893 AddProperty, UnwriteableProperty, InternalProperty); 1894 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) { 1895 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 1896 return false; 1897 } 1898 } 1899 } 1900 #endif 1901 1902 #if INCLUDE_JFR 1903 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1904 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) { 1905 return false; 1906 } 1907 } 1908 #endif 1909 1910 #ifndef SUPPORT_RESERVED_STACK_AREA 1911 if (StackReservedPages != 0) { 1912 FLAG_SET_CMDLINE(StackReservedPages, 0); 1913 warning("Reserved Stack Area not supported on this platform"); 1914 } 1915 #endif 1916 1917 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390) 1918 if (LockingMode == LM_LIGHTWEIGHT) { 1919 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY); 1920 warning("New lightweight locking not supported on this platform"); 1921 } 1922 #endif 1923 1924 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390) 1925 if (LockingMode == LM_MONITOR) { 1926 jio_fprintf(defaultStream::error_stream(), 1927 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n"); 1928 return false; 1929 } 1930 #endif 1931 #if defined(X86) && !defined(ZERO) 1932 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) { 1933 jio_fprintf(defaultStream::error_stream(), 1934 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n"); 1935 1936 return false; 1937 } 1938 #endif 1939 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) { 1940 jio_fprintf(defaultStream::error_stream(), 1941 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n"); 1942 return false; 1943 } 1944 return status; 1945 } 1946 1947 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1948 const char* option_type) { 1949 if (ignore) return false; 1950 1951 const char* spacer = " "; 1952 if (option_type == nullptr) { 1953 option_type = ++spacer; // Set both to the empty string. 1954 } 1955 1956 jio_fprintf(defaultStream::error_stream(), 1957 "Unrecognized %s%soption: %s\n", option_type, spacer, 1958 option->optionString); 1959 return true; 1960 } 1961 1962 static const char* user_assertion_options[] = { 1963 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1964 }; 1965 1966 static const char* system_assertion_options[] = { 1967 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1968 }; 1969 1970 bool Arguments::parse_uint(const char* value, 1971 uint* uint_arg, 1972 uint min_size) { 1973 uint n; 1974 if (!parse_integer(value, &n)) { 1975 return false; 1976 } 1977 if (n >= min_size) { 1978 *uint_arg = n; 1979 return true; 1980 } else { 1981 return false; 1982 } 1983 } 1984 1985 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 1986 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 1987 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 1988 char* property = AllocateHeap(prop_len, mtArguments); 1989 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 1990 if (ret < 0 || ret >= (int)prop_len) { 1991 FreeHeap(property); 1992 return false; 1993 } 1994 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 1995 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 1996 // that multiple occurrences of the associated flag just causes the existing property value to be 1997 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 1998 // to a property after we have finished flag processing. 1999 bool added = add_property(property, WriteableProperty, internal); 2000 FreeHeap(property); 2001 return added; 2002 } 2003 2004 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2005 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 2006 const unsigned int props_count_limit = 1000; 2007 const int max_digits = 3; 2008 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2009 2010 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2011 if (count < props_count_limit) { 2012 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2013 char* property = AllocateHeap(prop_len, mtArguments); 2014 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2015 if (ret < 0 || ret >= (int)prop_len) { 2016 FreeHeap(property); 2017 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2018 return false; 2019 } 2020 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2021 FreeHeap(property); 2022 return added; 2023 } 2024 2025 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2026 return false; 2027 } 2028 2029 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2030 julong* long_arg, 2031 julong min_size, 2032 julong max_size) { 2033 if (!parse_integer(s, long_arg)) return arg_unreadable; 2034 return check_memory_size(*long_arg, min_size, max_size); 2035 } 2036 2037 // Parse JavaVMInitArgs structure 2038 2039 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 2040 const JavaVMInitArgs *java_tool_options_args, 2041 const JavaVMInitArgs *java_options_args, 2042 const JavaVMInitArgs *cmd_line_args) { 2043 bool patch_mod_javabase = false; 2044 2045 // Save default settings for some mode flags 2046 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2047 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2048 Arguments::_ClipInlining = ClipInlining; 2049 Arguments::_BackgroundCompilation = BackgroundCompilation; 2050 2051 // Remember the default value of SharedBaseAddress. 2052 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 2053 2054 // Setup flags for mixed which is the default 2055 set_mode_flags(_mixed); 2056 2057 // Parse args structure generated from java.base vm options resource 2058 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE); 2059 if (result != JNI_OK) { 2060 return result; 2061 } 2062 2063 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2064 // variable (if present). 2065 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 2066 if (result != JNI_OK) { 2067 return result; 2068 } 2069 2070 // Parse args structure generated from the command line flags. 2071 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE); 2072 if (result != JNI_OK) { 2073 return result; 2074 } 2075 2076 // Parse args structure generated from the _JAVA_OPTIONS environment 2077 // variable (if present) (mimics classic VM) 2078 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 2079 if (result != JNI_OK) { 2080 return result; 2081 } 2082 2083 // Disable CDS for exploded image 2084 if (!has_jimage()) { 2085 no_shared_spaces("CDS disabled on exploded JDK"); 2086 } 2087 2088 // We need to ensure processor and memory resources have been properly 2089 // configured - which may rely on arguments we just processed - before 2090 // doing the final argument processing. Any argument processing that 2091 // needs to know about processor and memory resources must occur after 2092 // this point. 2093 2094 os::init_container_support(); 2095 2096 SystemMemoryBarrier::initialize(); 2097 2098 // Do final processing now that all arguments have been parsed 2099 result = finalize_vm_init_args(patch_mod_javabase); 2100 if (result != JNI_OK) { 2101 return result; 2102 } 2103 2104 return JNI_OK; 2105 } 2106 2107 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2108 // represents a valid JDWP agent. is_path==true denotes that we 2109 // are dealing with -agentpath (case where name is a path), otherwise with 2110 // -agentlib 2111 bool valid_jdwp_agent(char *name, bool is_path) { 2112 char *_name; 2113 const char *_jdwp = "jdwp"; 2114 size_t _len_jdwp, _len_prefix; 2115 2116 if (is_path) { 2117 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) { 2118 return false; 2119 } 2120 2121 _name++; // skip past last path separator 2122 _len_prefix = strlen(JNI_LIB_PREFIX); 2123 2124 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2125 return false; 2126 } 2127 2128 _name += _len_prefix; 2129 _len_jdwp = strlen(_jdwp); 2130 2131 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2132 _name += _len_jdwp; 2133 } 2134 else { 2135 return false; 2136 } 2137 2138 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2139 return false; 2140 } 2141 2142 return true; 2143 } 2144 2145 if (strcmp(name, _jdwp) == 0) { 2146 return true; 2147 } 2148 2149 return false; 2150 } 2151 2152 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2153 // --patch-module=<module>=<file>(<pathsep><file>)* 2154 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value"); 2155 // Find the equal sign between the module name and the path specification 2156 const char* module_equal = strchr(patch_mod_tail, '='); 2157 if (module_equal == nullptr) { 2158 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2159 return JNI_ERR; 2160 } else { 2161 // Pick out the module name 2162 size_t module_len = module_equal - patch_mod_tail; 2163 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2164 if (module_name != nullptr) { 2165 memcpy(module_name, patch_mod_tail, module_len); 2166 *(module_name + module_len) = '\0'; 2167 // The path piece begins one past the module_equal sign 2168 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2169 FREE_C_HEAP_ARRAY(char, module_name); 2170 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2171 return JNI_ENOMEM; 2172 } 2173 } else { 2174 return JNI_ENOMEM; 2175 } 2176 } 2177 return JNI_OK; 2178 } 2179 2180 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2181 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2182 // The min and max sizes match the values in globals.hpp, but scaled 2183 // with K. The values have been chosen so that alignment with page 2184 // size doesn't change the max value, which makes the conversions 2185 // back and forth between Xss value and ThreadStackSize value easier. 2186 // The values have also been chosen to fit inside a 32-bit signed type. 2187 const julong min_ThreadStackSize = 0; 2188 const julong max_ThreadStackSize = 1 * M; 2189 2190 // Make sure the above values match the range set in globals.hpp 2191 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2192 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2193 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2194 2195 const julong min_size = min_ThreadStackSize * K; 2196 const julong max_size = max_ThreadStackSize * K; 2197 2198 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2199 2200 julong size = 0; 2201 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2202 if (errcode != arg_in_range) { 2203 bool silent = (option == nullptr); // Allow testing to silence error messages 2204 if (!silent) { 2205 jio_fprintf(defaultStream::error_stream(), 2206 "Invalid thread stack size: %s\n", option->optionString); 2207 describe_range_error(errcode); 2208 } 2209 return JNI_EINVAL; 2210 } 2211 2212 // Internally track ThreadStackSize in units of 1024 bytes. 2213 const julong size_aligned = align_up(size, K); 2214 assert(size <= size_aligned, 2215 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2216 size, size_aligned); 2217 2218 const julong size_in_K = size_aligned / K; 2219 assert(size_in_K < (julong)max_intx, 2220 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2221 size_in_K); 2222 2223 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2224 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2225 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2226 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2227 max_expanded, size_in_K); 2228 2229 *out_ThreadStackSize = (intx)size_in_K; 2230 2231 return JNI_OK; 2232 } 2233 2234 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) { 2235 // For match_option to return remaining or value part of option string 2236 const char* tail; 2237 2238 // iterate over arguments 2239 for (int index = 0; index < args->nOptions; index++) { 2240 bool is_absolute_path = false; // for -agentpath vs -agentlib 2241 2242 const JavaVMOption* option = args->options + index; 2243 2244 if (!match_option(option, "-Djava.class.path", &tail) && 2245 !match_option(option, "-Dsun.java.command", &tail) && 2246 !match_option(option, "-Dsun.java.launcher", &tail)) { 2247 2248 // add all jvm options to the jvm_args string. This string 2249 // is used later to set the java.vm.args PerfData string constant. 2250 // the -Djava.class.path and the -Dsun.java.command options are 2251 // omitted from jvm_args string as each have their own PerfData 2252 // string constant object. 2253 build_jvm_args(option->optionString); 2254 } 2255 2256 // -verbose:[class/module/gc/jni] 2257 if (match_option(option, "-verbose", &tail)) { 2258 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2259 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2260 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2261 } else if (!strcmp(tail, ":module")) { 2262 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2263 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2264 } else if (!strcmp(tail, ":gc")) { 2265 if (_legacyGCLogging.lastFlag == 0) { 2266 _legacyGCLogging.lastFlag = 1; 2267 } 2268 } else if (!strcmp(tail, ":jni")) { 2269 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2270 } 2271 // -da / -ea / -disableassertions / -enableassertions 2272 // These accept an optional class/package name separated by a colon, e.g., 2273 // -da:java.lang.Thread. 2274 } else if (match_option(option, user_assertion_options, &tail, true)) { 2275 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2276 if (*tail == '\0') { 2277 JavaAssertions::setUserClassDefault(enable); 2278 } else { 2279 assert(*tail == ':', "bogus match by match_option()"); 2280 JavaAssertions::addOption(tail + 1, enable); 2281 } 2282 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2283 } else if (match_option(option, system_assertion_options, &tail, false)) { 2284 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2285 JavaAssertions::setSystemClassDefault(enable); 2286 // -bootclasspath: 2287 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2288 jio_fprintf(defaultStream::output_stream(), 2289 "-Xbootclasspath is no longer a supported option.\n"); 2290 return JNI_EINVAL; 2291 // -bootclasspath/a: 2292 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2293 Arguments::append_sysclasspath(tail); 2294 #if INCLUDE_CDS 2295 MetaspaceShared::disable_optimized_module_handling(); 2296 log_info(cds)("optimized module handling: disabled because bootclasspath was appended"); 2297 #endif 2298 // -bootclasspath/p: 2299 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2300 jio_fprintf(defaultStream::output_stream(), 2301 "-Xbootclasspath/p is no longer a supported option.\n"); 2302 return JNI_EINVAL; 2303 // -Xrun 2304 } else if (match_option(option, "-Xrun", &tail)) { 2305 if (tail != nullptr) { 2306 const char* pos = strchr(tail, ':'); 2307 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail; 2308 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2309 jio_snprintf(name, len + 1, "%s", tail); 2310 2311 char *options = nullptr; 2312 if(pos != nullptr) { 2313 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2314 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2315 } 2316 #if !INCLUDE_JVMTI 2317 if (strcmp(name, "jdwp") == 0) { 2318 jio_fprintf(defaultStream::error_stream(), 2319 "Debugging agents are not supported in this VM\n"); 2320 return JNI_ERR; 2321 } 2322 #endif // !INCLUDE_JVMTI 2323 JvmtiAgentList::add_xrun(name, options, false); 2324 FREE_C_HEAP_ARRAY(char, name); 2325 FREE_C_HEAP_ARRAY(char, options); 2326 } 2327 } else if (match_option(option, "--add-reads=", &tail)) { 2328 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2329 return JNI_ENOMEM; 2330 } 2331 } else if (match_option(option, "--add-exports=", &tail)) { 2332 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2333 return JNI_ENOMEM; 2334 } 2335 } else if (match_option(option, "--add-opens=", &tail)) { 2336 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2337 return JNI_ENOMEM; 2338 } 2339 } else if (match_option(option, "--add-modules=", &tail)) { 2340 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2341 return JNI_ENOMEM; 2342 } 2343 } else if (match_option(option, "--enable-native-access=", &tail)) { 2344 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2345 return JNI_ENOMEM; 2346 } 2347 } else if (match_option(option, "--limit-modules=", &tail)) { 2348 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2349 return JNI_ENOMEM; 2350 } 2351 } else if (match_option(option, "--module-path=", &tail)) { 2352 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2353 return JNI_ENOMEM; 2354 } 2355 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2356 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2357 return JNI_ENOMEM; 2358 } 2359 } else if (match_option(option, "--patch-module=", &tail)) { 2360 // --patch-module=<module>=<file>(<pathsep><file>)* 2361 int res = process_patch_mod_option(tail, patch_mod_javabase); 2362 if (res != JNI_OK) { 2363 return res; 2364 } 2365 } else if (match_option(option, "--illegal-access=", &tail)) { 2366 char version[256]; 2367 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2368 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2369 // -agentlib and -agentpath 2370 } else if (match_option(option, "-agentlib:", &tail) || 2371 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2372 if(tail != nullptr) { 2373 const char* pos = strchr(tail, '='); 2374 char* name; 2375 if (pos == nullptr) { 2376 name = os::strdup_check_oom(tail, mtArguments); 2377 } else { 2378 size_t len = pos - tail; 2379 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2380 memcpy(name, tail, len); 2381 name[len] = '\0'; 2382 } 2383 2384 char *options = nullptr; 2385 if(pos != nullptr) { 2386 options = os::strdup_check_oom(pos + 1, mtArguments); 2387 } 2388 #if !INCLUDE_JVMTI 2389 if (valid_jdwp_agent(name, is_absolute_path)) { 2390 jio_fprintf(defaultStream::error_stream(), 2391 "Debugging agents are not supported in this VM\n"); 2392 return JNI_ERR; 2393 } 2394 #endif // !INCLUDE_JVMTI 2395 JvmtiAgentList::add(name, options, is_absolute_path); 2396 os::free(name); 2397 os::free(options); 2398 } 2399 // -javaagent 2400 } else if (match_option(option, "-javaagent:", &tail)) { 2401 #if !INCLUDE_JVMTI 2402 jio_fprintf(defaultStream::error_stream(), 2403 "Instrumentation agents are not supported in this VM\n"); 2404 return JNI_ERR; 2405 #else 2406 if (tail != nullptr) { 2407 size_t length = strlen(tail) + 1; 2408 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2409 jio_snprintf(options, length, "%s", tail); 2410 JvmtiAgentList::add("instrument", options, false); 2411 FREE_C_HEAP_ARRAY(char, options); 2412 2413 // java agents need module java.instrument 2414 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2415 return JNI_ENOMEM; 2416 } 2417 } 2418 #endif // !INCLUDE_JVMTI 2419 // --enable_preview 2420 } else if (match_option(option, "--enable-preview")) { 2421 set_enable_preview(); 2422 // -Xnoclassgc 2423 } else if (match_option(option, "-Xnoclassgc")) { 2424 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2425 return JNI_EINVAL; 2426 } 2427 // -Xbatch 2428 } else if (match_option(option, "-Xbatch")) { 2429 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2430 return JNI_EINVAL; 2431 } 2432 // -Xmn for compatibility with other JVM vendors 2433 } else if (match_option(option, "-Xmn", &tail)) { 2434 julong long_initial_young_size = 0; 2435 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2436 if (errcode != arg_in_range) { 2437 jio_fprintf(defaultStream::error_stream(), 2438 "Invalid initial young generation size: %s\n", option->optionString); 2439 describe_range_error(errcode); 2440 return JNI_EINVAL; 2441 } 2442 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2443 return JNI_EINVAL; 2444 } 2445 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2446 return JNI_EINVAL; 2447 } 2448 // -Xms 2449 } else if (match_option(option, "-Xms", &tail)) { 2450 julong size = 0; 2451 // an initial heap size of 0 means automatically determine 2452 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2453 if (errcode != arg_in_range) { 2454 jio_fprintf(defaultStream::error_stream(), 2455 "Invalid initial heap size: %s\n", option->optionString); 2456 describe_range_error(errcode); 2457 return JNI_EINVAL; 2458 } 2459 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2460 return JNI_EINVAL; 2461 } 2462 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2463 return JNI_EINVAL; 2464 } 2465 // -Xmx 2466 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2467 julong long_max_heap_size = 0; 2468 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2469 if (errcode != arg_in_range) { 2470 jio_fprintf(defaultStream::error_stream(), 2471 "Invalid maximum heap size: %s\n", option->optionString); 2472 describe_range_error(errcode); 2473 return JNI_EINVAL; 2474 } 2475 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2476 return JNI_EINVAL; 2477 } 2478 // Xmaxf 2479 } else if (match_option(option, "-Xmaxf", &tail)) { 2480 char* err; 2481 int maxf = (int)(strtod(tail, &err) * 100); 2482 if (*err != '\0' || *tail == '\0') { 2483 jio_fprintf(defaultStream::error_stream(), 2484 "Bad max heap free percentage size: %s\n", 2485 option->optionString); 2486 return JNI_EINVAL; 2487 } else { 2488 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2489 return JNI_EINVAL; 2490 } 2491 } 2492 // Xminf 2493 } else if (match_option(option, "-Xminf", &tail)) { 2494 char* err; 2495 int minf = (int)(strtod(tail, &err) * 100); 2496 if (*err != '\0' || *tail == '\0') { 2497 jio_fprintf(defaultStream::error_stream(), 2498 "Bad min heap free percentage size: %s\n", 2499 option->optionString); 2500 return JNI_EINVAL; 2501 } else { 2502 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2503 return JNI_EINVAL; 2504 } 2505 } 2506 // -Xss 2507 } else if (match_option(option, "-Xss", &tail)) { 2508 intx value = 0; 2509 jint err = parse_xss(option, tail, &value); 2510 if (err != JNI_OK) { 2511 return err; 2512 } 2513 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2514 return JNI_EINVAL; 2515 } 2516 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2517 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2518 julong long_ReservedCodeCacheSize = 0; 2519 2520 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2521 if (errcode != arg_in_range) { 2522 jio_fprintf(defaultStream::error_stream(), 2523 "Invalid maximum code cache size: %s.\n", option->optionString); 2524 return JNI_EINVAL; 2525 } 2526 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2527 return JNI_EINVAL; 2528 } 2529 // -green 2530 } else if (match_option(option, "-green")) { 2531 jio_fprintf(defaultStream::error_stream(), 2532 "Green threads support not available\n"); 2533 return JNI_EINVAL; 2534 // -native 2535 } else if (match_option(option, "-native")) { 2536 // HotSpot always uses native threads, ignore silently for compatibility 2537 // -Xrs 2538 } else if (match_option(option, "-Xrs")) { 2539 // Classic/EVM option, new functionality 2540 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2541 return JNI_EINVAL; 2542 } 2543 // -Xprof 2544 } else if (match_option(option, "-Xprof")) { 2545 char version[256]; 2546 // Obsolete in JDK 10 2547 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2548 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2549 // -Xinternalversion 2550 } else if (match_option(option, "-Xinternalversion")) { 2551 jio_fprintf(defaultStream::output_stream(), "%s\n", 2552 VM_Version::internal_vm_info_string()); 2553 vm_exit(0); 2554 #ifndef PRODUCT 2555 // -Xprintflags 2556 } else if (match_option(option, "-Xprintflags")) { 2557 JVMFlag::printFlags(tty, false); 2558 vm_exit(0); 2559 #endif 2560 // -D 2561 } else if (match_option(option, "-D", &tail)) { 2562 const char* value; 2563 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2564 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2565 // abort if -Djava.endorsed.dirs is set 2566 jio_fprintf(defaultStream::output_stream(), 2567 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2568 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2569 return JNI_EINVAL; 2570 } 2571 if (match_option(option, "-Djava.ext.dirs=", &value) && 2572 *value != '\0' && strcmp(value, "\"\"") != 0) { 2573 // abort if -Djava.ext.dirs is set 2574 jio_fprintf(defaultStream::output_stream(), 2575 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2576 return JNI_EINVAL; 2577 } 2578 // Check for module related properties. They must be set using the modules 2579 // options. For example: use "--add-modules=java.sql", not 2580 // "-Djdk.module.addmods=java.sql" 2581 if (is_internal_module_property(option->optionString + 2)) { 2582 needs_module_property_warning = true; 2583 continue; 2584 } 2585 if (!add_property(tail)) { 2586 return JNI_ENOMEM; 2587 } 2588 // Out of the box management support 2589 if (match_option(option, "-Dcom.sun.management", &tail)) { 2590 #if INCLUDE_MANAGEMENT 2591 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2592 return JNI_EINVAL; 2593 } 2594 // management agent in module jdk.management.agent 2595 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2596 return JNI_ENOMEM; 2597 } 2598 #else 2599 jio_fprintf(defaultStream::output_stream(), 2600 "-Dcom.sun.management is not supported in this VM.\n"); 2601 return JNI_ERR; 2602 #endif 2603 } 2604 // -Xint 2605 } else if (match_option(option, "-Xint")) { 2606 set_mode_flags(_int); 2607 mode_flag_cmd_line = true; 2608 // -Xmixed 2609 } else if (match_option(option, "-Xmixed")) { 2610 set_mode_flags(_mixed); 2611 mode_flag_cmd_line = true; 2612 // -Xcomp 2613 } else if (match_option(option, "-Xcomp")) { 2614 // for testing the compiler; turn off all flags that inhibit compilation 2615 set_mode_flags(_comp); 2616 mode_flag_cmd_line = true; 2617 // -Xshare:dump 2618 } else if (match_option(option, "-Xshare:dump")) { 2619 CDSConfig::enable_dumping_static_archive(); 2620 // -Xshare:on 2621 } else if (match_option(option, "-Xshare:on")) { 2622 UseSharedSpaces = true; 2623 RequireSharedSpaces = true; 2624 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2625 } else if (match_option(option, "-Xshare:auto")) { 2626 UseSharedSpaces = true; 2627 RequireSharedSpaces = false; 2628 xshare_auto_cmd_line = true; 2629 // -Xshare:off 2630 } else if (match_option(option, "-Xshare:off")) { 2631 UseSharedSpaces = false; 2632 RequireSharedSpaces = false; 2633 // -Xverify 2634 } else if (match_option(option, "-Xverify", &tail)) { 2635 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2636 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2637 return JNI_EINVAL; 2638 } 2639 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2640 return JNI_EINVAL; 2641 } 2642 } else if (strcmp(tail, ":remote") == 0) { 2643 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2644 return JNI_EINVAL; 2645 } 2646 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2647 return JNI_EINVAL; 2648 } 2649 } else if (strcmp(tail, ":none") == 0) { 2650 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2651 return JNI_EINVAL; 2652 } 2653 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2654 return JNI_EINVAL; 2655 } 2656 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2657 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2658 return JNI_EINVAL; 2659 } 2660 // -Xdebug 2661 } else if (match_option(option, "-Xdebug")) { 2662 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release."); 2663 // -Xnoagent 2664 } else if (match_option(option, "-Xnoagent")) { 2665 warning("Option -Xnoagent was deprecated in JDK 22 and will likely be removed in a future release."); 2666 } else if (match_option(option, "-Xloggc:", &tail)) { 2667 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2668 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2669 _legacyGCLogging.lastFlag = 2; 2670 _legacyGCLogging.file = os::strdup_check_oom(tail); 2671 } else if (match_option(option, "-Xlog", &tail)) { 2672 bool ret = false; 2673 if (strcmp(tail, ":help") == 0) { 2674 fileStream stream(defaultStream::output_stream()); 2675 LogConfiguration::print_command_line_help(&stream); 2676 vm_exit(0); 2677 } else if (strcmp(tail, ":disable") == 0) { 2678 LogConfiguration::disable_logging(); 2679 ret = true; 2680 } else if (strcmp(tail, ":async") == 0) { 2681 LogConfiguration::set_async_mode(true); 2682 ret = true; 2683 } else if (*tail == '\0') { 2684 ret = LogConfiguration::parse_command_line_arguments(); 2685 assert(ret, "-Xlog without arguments should never fail to parse"); 2686 } else if (*tail == ':') { 2687 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2688 } 2689 if (ret == false) { 2690 jio_fprintf(defaultStream::error_stream(), 2691 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2692 tail); 2693 return JNI_EINVAL; 2694 } 2695 // JNI hooks 2696 } else if (match_option(option, "-Xcheck", &tail)) { 2697 if (!strcmp(tail, ":jni")) { 2698 #if !INCLUDE_JNI_CHECK 2699 warning("JNI CHECKING is not supported in this VM"); 2700 #else 2701 CheckJNICalls = true; 2702 #endif // INCLUDE_JNI_CHECK 2703 } else if (is_bad_option(option, args->ignoreUnrecognized, 2704 "check")) { 2705 return JNI_EINVAL; 2706 } 2707 } else if (match_option(option, "vfprintf")) { 2708 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2709 } else if (match_option(option, "exit")) { 2710 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2711 } else if (match_option(option, "abort")) { 2712 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2713 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2714 // and the last option wins. 2715 } else if (match_option(option, "-XX:+NeverTenure")) { 2716 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2717 return JNI_EINVAL; 2718 } 2719 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2720 return JNI_EINVAL; 2721 } 2722 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2723 return JNI_EINVAL; 2724 } 2725 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2726 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2727 return JNI_EINVAL; 2728 } 2729 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2730 return JNI_EINVAL; 2731 } 2732 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2733 return JNI_EINVAL; 2734 } 2735 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2736 uint max_tenuring_thresh = 0; 2737 if (!parse_uint(tail, &max_tenuring_thresh, 0)) { 2738 jio_fprintf(defaultStream::error_stream(), 2739 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2740 return JNI_EINVAL; 2741 } 2742 2743 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2744 return JNI_EINVAL; 2745 } 2746 2747 if (MaxTenuringThreshold == 0) { 2748 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2749 return JNI_EINVAL; 2750 } 2751 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2752 return JNI_EINVAL; 2753 } 2754 } else { 2755 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2756 return JNI_EINVAL; 2757 } 2758 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2759 return JNI_EINVAL; 2760 } 2761 } 2762 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2763 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2764 return JNI_EINVAL; 2765 } 2766 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2767 return JNI_EINVAL; 2768 } 2769 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2770 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2771 return JNI_EINVAL; 2772 } 2773 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2774 return JNI_EINVAL; 2775 } 2776 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2777 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2778 return JNI_EINVAL; 2779 } 2780 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2781 return JNI_EINVAL; 2782 } 2783 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2784 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2785 return JNI_EINVAL; 2786 } 2787 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2788 return JNI_EINVAL; 2789 } 2790 } else if (match_option(option, "--finalization=", &tail)) { 2791 if (strcmp(tail, "enabled") == 0) { 2792 InstanceKlass::set_finalization_enabled(true); 2793 } else if (strcmp(tail, "disabled") == 0) { 2794 InstanceKlass::set_finalization_enabled(false); 2795 } else { 2796 jio_fprintf(defaultStream::error_stream(), 2797 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2798 tail); 2799 return JNI_EINVAL; 2800 } 2801 #if !defined(DTRACE_ENABLED) 2802 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2803 jio_fprintf(defaultStream::error_stream(), 2804 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2805 return JNI_EINVAL; 2806 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2807 jio_fprintf(defaultStream::error_stream(), 2808 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2809 return JNI_EINVAL; 2810 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2811 jio_fprintf(defaultStream::error_stream(), 2812 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2813 return JNI_EINVAL; 2814 #endif // !defined(DTRACE_ENABLED) 2815 #ifdef ASSERT 2816 } else if (match_option(option, "-XX:+FullGCALot")) { 2817 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2818 return JNI_EINVAL; 2819 } 2820 // disable scavenge before parallel mark-compact 2821 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2822 return JNI_EINVAL; 2823 } 2824 #endif 2825 #if !INCLUDE_MANAGEMENT 2826 } else if (match_option(option, "-XX:+ManagementServer")) { 2827 jio_fprintf(defaultStream::error_stream(), 2828 "ManagementServer is not supported in this VM.\n"); 2829 return JNI_ERR; 2830 #endif // INCLUDE_MANAGEMENT 2831 #if INCLUDE_JVMCI 2832 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) { 2833 if (EnableJVMCIProduct) { 2834 jio_fprintf(defaultStream::error_stream(), 2835 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n"); 2836 return JNI_EINVAL; 2837 } 2838 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) { 2839 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT"); 2840 if (use_graal_jit) { 2841 const char* jvmci_compiler = get_property("jvmci.Compiler"); 2842 if (jvmci_compiler != nullptr) { 2843 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) { 2844 jio_fprintf(defaultStream::error_stream(), 2845 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler); 2846 return JNI_ERR; 2847 } 2848 } else if (!add_property("jvmci.Compiler=graal")) { 2849 return JNI_ENOMEM; 2850 } 2851 } 2852 2853 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before 2854 if (EnableJVMCIProduct) { 2855 continue; 2856 } 2857 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2858 // Allow this flag if it has been unlocked. 2859 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) { 2860 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) { 2861 jio_fprintf(defaultStream::error_stream(), 2862 "Unable to enable JVMCI in product mode\n"); 2863 return JNI_ERR; 2864 } 2865 } 2866 // The flag was locked so process normally to report that error 2867 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2868 return JNI_EINVAL; 2869 } 2870 #endif // INCLUDE_JVMCI 2871 #if INCLUDE_JFR 2872 } else if (match_jfr_option(&option)) { 2873 return JNI_EINVAL; 2874 #endif 2875 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2876 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2877 // already been handled 2878 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2879 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2880 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2881 return JNI_EINVAL; 2882 } 2883 } 2884 // Unknown option 2885 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2886 return JNI_ERR; 2887 } 2888 } 2889 2890 // PrintSharedArchiveAndExit will turn on 2891 // -Xshare:on 2892 // -Xlog:class+path=info 2893 if (PrintSharedArchiveAndExit) { 2894 UseSharedSpaces = true; 2895 RequireSharedSpaces = true; 2896 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2897 } 2898 2899 fix_appclasspath(); 2900 2901 return JNI_OK; 2902 } 2903 2904 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 2905 // For java.base check for duplicate --patch-module options being specified on the command line. 2906 // This check is only required for java.base, all other duplicate module specifications 2907 // will be checked during module system initialization. The module system initialization 2908 // will throw an ExceptionInInitializerError if this situation occurs. 2909 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2910 if (*patch_mod_javabase) { 2911 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2912 } else { 2913 *patch_mod_javabase = true; 2914 } 2915 } 2916 2917 // Create GrowableArray lazily, only if --patch-module has been specified 2918 if (_patch_mod_prefix == nullptr) { 2919 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2920 } 2921 2922 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2923 } 2924 2925 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2926 // 2927 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2928 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2929 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2930 // path is treated as the current directory. 2931 // 2932 // This causes problems with CDS, which requires that all directories specified in the classpath 2933 // must be empty. In most cases, applications do NOT want to load classes from the current 2934 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2935 // scripts compatible with CDS. 2936 void Arguments::fix_appclasspath() { 2937 if (IgnoreEmptyClassPaths) { 2938 const char separator = *os::path_separator(); 2939 const char* src = _java_class_path->value(); 2940 2941 // skip over all the leading empty paths 2942 while (*src == separator) { 2943 src ++; 2944 } 2945 2946 char* copy = os::strdup_check_oom(src, mtArguments); 2947 2948 // trim all trailing empty paths 2949 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 2950 *tail = '\0'; 2951 } 2952 2953 char from[3] = {separator, separator, '\0'}; 2954 char to [2] = {separator, '\0'}; 2955 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 2956 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 2957 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 2958 } 2959 2960 _java_class_path->set_writeable_value(copy); 2961 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 2962 } 2963 } 2964 2965 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 2966 // check if the default lib/endorsed directory exists; if so, error 2967 char path[JVM_MAXPATHLEN]; 2968 const char* fileSep = os::file_separator(); 2969 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 2970 2971 DIR* dir = os::opendir(path); 2972 if (dir != nullptr) { 2973 jio_fprintf(defaultStream::output_stream(), 2974 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 2975 "in modular form will be supported via the concept of upgradeable modules.\n"); 2976 os::closedir(dir); 2977 return JNI_ERR; 2978 } 2979 2980 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 2981 dir = os::opendir(path); 2982 if (dir != nullptr) { 2983 jio_fprintf(defaultStream::output_stream(), 2984 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 2985 "Use -classpath instead.\n."); 2986 os::closedir(dir); 2987 return JNI_ERR; 2988 } 2989 2990 // This must be done after all arguments have been processed 2991 // and the container support has been initialized since AggressiveHeap 2992 // relies on the amount of total memory available. 2993 if (AggressiveHeap) { 2994 jint result = set_aggressive_heap_flags(); 2995 if (result != JNI_OK) { 2996 return result; 2997 } 2998 } 2999 3000 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3001 // but like -Xint, leave compilation thresholds unaffected. 3002 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3003 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3004 set_mode_flags(_int); 3005 } 3006 3007 #ifdef ZERO 3008 // Zero always runs in interpreted mode 3009 set_mode_flags(_int); 3010 #endif 3011 3012 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3013 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3014 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3015 } 3016 3017 #if !COMPILER2_OR_JVMCI 3018 // Don't degrade server performance for footprint 3019 if (FLAG_IS_DEFAULT(UseLargePages) && 3020 MaxHeapSize < LargePageHeapSizeThreshold) { 3021 // No need for large granularity pages w/small heaps. 3022 // Note that large pages are enabled/disabled for both the 3023 // Java heap and the code cache. 3024 FLAG_SET_DEFAULT(UseLargePages, false); 3025 } 3026 3027 UNSUPPORTED_OPTION(ProfileInterpreter); 3028 #endif 3029 3030 // Parse the CompilationMode flag 3031 if (!CompilationModeFlag::initialize()) { 3032 return JNI_ERR; 3033 } 3034 3035 if (!check_vm_args_consistency()) { 3036 return JNI_ERR; 3037 } 3038 3039 #if INCLUDE_CDS 3040 if (CDSConfig::is_dumping_static_archive()) { 3041 if (!mode_flag_cmd_line) { 3042 // By default, -Xshare:dump runs in interpreter-only mode, which is required for deterministic archive. 3043 // 3044 // If your classlist is large and you don't care about deterministic dumping, you can use 3045 // -Xshare:dump -Xmixed to improve dumping speed. 3046 set_mode_flags(_int); 3047 } else if (_mode == _comp) { 3048 // -Xcomp may use excessive CPU for the test tiers. Also, -Xshare:dump runs a small and fixed set of 3049 // Java code, so there's not much benefit in running -Xcomp. 3050 log_info(cds)("reduced -Xcomp to -Xmixed for static dumping"); 3051 set_mode_flags(_mixed); 3052 } 3053 3054 // String deduplication may cause CDS to iterate the strings in different order from one 3055 // run to another which resulting in non-determinstic CDS archives. 3056 // Disable UseStringDeduplication while dumping CDS archive. 3057 UseStringDeduplication = false; 3058 } 3059 3060 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit 3061 if (ArchiveClassesAtExit != nullptr && RecordDynamicDumpInfo) { 3062 jio_fprintf(defaultStream::output_stream(), 3063 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n"); 3064 return JNI_ERR; 3065 } 3066 3067 if (ArchiveClassesAtExit == nullptr && !RecordDynamicDumpInfo) { 3068 CDSConfig::disable_dumping_dynamic_archive(); 3069 } else { 3070 CDSConfig::enable_dumping_dynamic_archive(); 3071 } 3072 3073 if (AutoCreateSharedArchive) { 3074 if (SharedArchiveFile == nullptr) { 3075 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile"); 3076 return JNI_ERR; 3077 } 3078 if (ArchiveClassesAtExit != nullptr) { 3079 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit"); 3080 return JNI_ERR; 3081 } 3082 } 3083 3084 if (UseSharedSpaces && patch_mod_javabase) { 3085 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3086 } 3087 if (UseSharedSpaces && check_unsupported_cds_runtime_properties()) { 3088 UseSharedSpaces = false; 3089 } 3090 3091 if (CDSConfig::is_dumping_archive()) { 3092 // Always verify non-system classes during CDS dump 3093 if (!BytecodeVerificationRemote) { 3094 BytecodeVerificationRemote = true; 3095 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3096 } 3097 } 3098 #endif 3099 3100 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3101 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3102 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3103 3104 return JNI_OK; 3105 } 3106 3107 // Helper class for controlling the lifetime of JavaVMInitArgs 3108 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3109 // deleted on the destruction of the ScopedVMInitArgs object. 3110 class ScopedVMInitArgs : public StackObj { 3111 private: 3112 JavaVMInitArgs _args; 3113 char* _container_name; 3114 bool _is_set; 3115 char* _vm_options_file_arg; 3116 3117 public: 3118 ScopedVMInitArgs(const char *container_name) { 3119 _args.version = JNI_VERSION_1_2; 3120 _args.nOptions = 0; 3121 _args.options = nullptr; 3122 _args.ignoreUnrecognized = false; 3123 _container_name = (char *)container_name; 3124 _is_set = false; 3125 _vm_options_file_arg = nullptr; 3126 } 3127 3128 // Populates the JavaVMInitArgs object represented by this 3129 // ScopedVMInitArgs object with the arguments in options. The 3130 // allocated memory is deleted by the destructor. If this method 3131 // returns anything other than JNI_OK, then this object is in a 3132 // partially constructed state, and should be abandoned. 3133 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3134 _is_set = true; 3135 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3136 JavaVMOption, options->length(), mtArguments); 3137 if (options_arr == nullptr) { 3138 return JNI_ENOMEM; 3139 } 3140 _args.options = options_arr; 3141 3142 for (int i = 0; i < options->length(); i++) { 3143 options_arr[i] = options->at(i); 3144 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3145 if (options_arr[i].optionString == nullptr) { 3146 // Rely on the destructor to do cleanup. 3147 _args.nOptions = i; 3148 return JNI_ENOMEM; 3149 } 3150 } 3151 3152 _args.nOptions = options->length(); 3153 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3154 return JNI_OK; 3155 } 3156 3157 JavaVMInitArgs* get() { return &_args; } 3158 char* container_name() { return _container_name; } 3159 bool is_set() { return _is_set; } 3160 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; } 3161 char* vm_options_file_arg() { return _vm_options_file_arg; } 3162 3163 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3164 if (_vm_options_file_arg != nullptr) { 3165 os::free(_vm_options_file_arg); 3166 } 3167 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3168 } 3169 3170 ~ScopedVMInitArgs() { 3171 if (_vm_options_file_arg != nullptr) { 3172 os::free(_vm_options_file_arg); 3173 } 3174 if (_args.options == nullptr) return; 3175 for (int i = 0; i < _args.nOptions; i++) { 3176 os::free(_args.options[i].optionString); 3177 } 3178 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3179 } 3180 3181 // Insert options into this option list, to replace option at 3182 // vm_options_file_pos (-XX:VMOptionsFile) 3183 jint insert(const JavaVMInitArgs* args, 3184 const JavaVMInitArgs* args_to_insert, 3185 const int vm_options_file_pos) { 3186 assert(_args.options == nullptr, "shouldn't be set yet"); 3187 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3188 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3189 3190 int length = args->nOptions + args_to_insert->nOptions - 1; 3191 // Construct new option array 3192 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3193 for (int i = 0; i < args->nOptions; i++) { 3194 if (i == vm_options_file_pos) { 3195 // insert the new options starting at the same place as the 3196 // -XX:VMOptionsFile option 3197 for (int j = 0; j < args_to_insert->nOptions; j++) { 3198 options.push(args_to_insert->options[j]); 3199 } 3200 } else { 3201 options.push(args->options[i]); 3202 } 3203 } 3204 // make into options array 3205 return set_args(&options); 3206 } 3207 }; 3208 3209 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3210 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3211 } 3212 3213 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3214 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3215 } 3216 3217 jint Arguments::parse_options_environment_variable(const char* name, 3218 ScopedVMInitArgs* vm_args) { 3219 char *buffer = ::getenv(name); 3220 3221 // Don't check this environment variable if user has special privileges 3222 // (e.g. unix su command). 3223 if (buffer == nullptr || os::have_special_privileges()) { 3224 return JNI_OK; 3225 } 3226 3227 if ((buffer = os::strdup(buffer)) == nullptr) { 3228 return JNI_ENOMEM; 3229 } 3230 3231 jio_fprintf(defaultStream::error_stream(), 3232 "Picked up %s: %s\n", name, buffer); 3233 3234 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3235 3236 os::free(buffer); 3237 return retcode; 3238 } 3239 3240 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3241 // read file into buffer 3242 int fd = ::open(file_name, O_RDONLY); 3243 if (fd < 0) { 3244 jio_fprintf(defaultStream::error_stream(), 3245 "Could not open options file '%s'\n", 3246 file_name); 3247 return JNI_ERR; 3248 } 3249 3250 struct stat stbuf; 3251 int retcode = os::stat(file_name, &stbuf); 3252 if (retcode != 0) { 3253 jio_fprintf(defaultStream::error_stream(), 3254 "Could not stat options file '%s'\n", 3255 file_name); 3256 ::close(fd); 3257 return JNI_ERR; 3258 } 3259 3260 if (stbuf.st_size == 0) { 3261 // tell caller there is no option data and that is ok 3262 ::close(fd); 3263 return JNI_OK; 3264 } 3265 3266 // '+ 1' for null termination even with max bytes 3267 size_t bytes_alloc = stbuf.st_size + 1; 3268 3269 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3270 if (nullptr == buf) { 3271 jio_fprintf(defaultStream::error_stream(), 3272 "Could not allocate read buffer for options file parse\n"); 3273 ::close(fd); 3274 return JNI_ENOMEM; 3275 } 3276 3277 memset(buf, 0, bytes_alloc); 3278 3279 // Fill buffer 3280 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3281 ::close(fd); 3282 if (bytes_read < 0) { 3283 FREE_C_HEAP_ARRAY(char, buf); 3284 jio_fprintf(defaultStream::error_stream(), 3285 "Could not read options file '%s'\n", file_name); 3286 return JNI_ERR; 3287 } 3288 3289 if (bytes_read == 0) { 3290 // tell caller there is no option data and that is ok 3291 FREE_C_HEAP_ARRAY(char, buf); 3292 return JNI_OK; 3293 } 3294 3295 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3296 3297 FREE_C_HEAP_ARRAY(char, buf); 3298 return retcode; 3299 } 3300 3301 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3302 // Construct option array 3303 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3304 3305 // some pointers to help with parsing 3306 char *buffer_end = buffer + buf_len; 3307 char *opt_hd = buffer; 3308 char *wrt = buffer; 3309 char *rd = buffer; 3310 3311 // parse all options 3312 while (rd < buffer_end) { 3313 // skip leading white space from the input string 3314 while (rd < buffer_end && isspace(*rd)) { 3315 rd++; 3316 } 3317 3318 if (rd >= buffer_end) { 3319 break; 3320 } 3321 3322 // Remember this is where we found the head of the token. 3323 opt_hd = wrt; 3324 3325 // Tokens are strings of non white space characters separated 3326 // by one or more white spaces. 3327 while (rd < buffer_end && !isspace(*rd)) { 3328 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3329 int quote = *rd; // matching quote to look for 3330 rd++; // don't copy open quote 3331 while (rd < buffer_end && *rd != quote) { 3332 // include everything (even spaces) 3333 // up until the close quote 3334 *wrt++ = *rd++; // copy to option string 3335 } 3336 3337 if (rd < buffer_end) { 3338 rd++; // don't copy close quote 3339 } else { 3340 // did not see closing quote 3341 jio_fprintf(defaultStream::error_stream(), 3342 "Unmatched quote in %s\n", name); 3343 return JNI_ERR; 3344 } 3345 } else { 3346 *wrt++ = *rd++; // copy to option string 3347 } 3348 } 3349 3350 // steal a white space character and set it to null 3351 *wrt++ = '\0'; 3352 // We now have a complete token 3353 3354 JavaVMOption option; 3355 option.optionString = opt_hd; 3356 option.extraInfo = nullptr; 3357 3358 options.append(option); // Fill in option 3359 3360 rd++; // Advance to next character 3361 } 3362 3363 // Fill out JavaVMInitArgs structure. 3364 return vm_args->set_args(&options); 3365 } 3366 3367 void Arguments::set_shared_spaces_flags_and_archive_paths() { 3368 if (CDSConfig::is_dumping_static_archive()) { 3369 if (RequireSharedSpaces) { 3370 warning("Cannot dump shared archive while using shared archive"); 3371 } 3372 UseSharedSpaces = false; 3373 } 3374 #if INCLUDE_CDS 3375 // Initialize shared archive paths which could include both base and dynamic archive paths 3376 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly. 3377 // 3378 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid. 3379 if (CDSConfig::is_dumping_static_archive() || UseSharedSpaces) { 3380 init_shared_archive_paths(); 3381 } 3382 #endif // INCLUDE_CDS 3383 } 3384 3385 #if INCLUDE_CDS 3386 // Sharing support 3387 // Construct the path to the archive 3388 char* Arguments::get_default_shared_archive_path() { 3389 if (_default_shared_archive_path == nullptr) { 3390 char jvm_path[JVM_MAXPATHLEN]; 3391 os::jvm_path(jvm_path, sizeof(jvm_path)); 3392 char *end = strrchr(jvm_path, *os::file_separator()); 3393 if (end != nullptr) *end = '\0'; 3394 size_t jvm_path_len = strlen(jvm_path); 3395 size_t file_sep_len = strlen(os::file_separator()); 3396 const size_t len = jvm_path_len + file_sep_len + 20; 3397 _default_shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3398 jio_snprintf(_default_shared_archive_path, len, 3399 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa", 3400 jvm_path, os::file_separator()); 3401 } 3402 return _default_shared_archive_path; 3403 } 3404 3405 int Arguments::num_archives(const char* archive_path) { 3406 if (archive_path == nullptr) { 3407 return 0; 3408 } 3409 int npaths = 1; 3410 char* p = (char*)archive_path; 3411 while (*p != '\0') { 3412 if (*p == os::path_separator()[0]) { 3413 npaths++; 3414 } 3415 p++; 3416 } 3417 return npaths; 3418 } 3419 3420 void Arguments::extract_shared_archive_paths(const char* archive_path, 3421 char** base_archive_path, 3422 char** top_archive_path) { 3423 char* begin_ptr = (char*)archive_path; 3424 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3425 if (end_ptr == nullptr || end_ptr == begin_ptr) { 3426 vm_exit_during_initialization("Base archive was not specified", archive_path); 3427 } 3428 size_t len = end_ptr - begin_ptr; 3429 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3430 strncpy(cur_path, begin_ptr, len); 3431 cur_path[len] = '\0'; 3432 *base_archive_path = cur_path; 3433 3434 begin_ptr = ++end_ptr; 3435 if (*begin_ptr == '\0') { 3436 vm_exit_during_initialization("Top archive was not specified", archive_path); 3437 } 3438 end_ptr = strchr(begin_ptr, '\0'); 3439 assert(end_ptr != nullptr, "sanity"); 3440 len = end_ptr - begin_ptr; 3441 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3442 strncpy(cur_path, begin_ptr, len + 1); 3443 *top_archive_path = cur_path; 3444 } 3445 3446 void Arguments::init_shared_archive_paths() { 3447 if (ArchiveClassesAtExit != nullptr) { 3448 assert(!RecordDynamicDumpInfo, "already checked"); 3449 if (CDSConfig::is_dumping_static_archive()) { 3450 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3451 } 3452 check_unsupported_dumping_properties(); 3453 3454 if (os::same_files(get_default_shared_archive_path(), ArchiveClassesAtExit)) { 3455 vm_exit_during_initialization( 3456 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path()); 3457 } 3458 } 3459 3460 if (SharedArchiveFile == nullptr) { 3461 SharedArchivePath = get_default_shared_archive_path(); 3462 } else { 3463 int archives = num_archives(SharedArchiveFile); 3464 assert(archives > 0, "must be"); 3465 3466 if (CDSConfig::is_dumping_archive() && archives > 1) { 3467 vm_exit_during_initialization( 3468 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3469 } 3470 3471 if (CDSConfig::is_dumping_static_archive()) { 3472 assert(archives == 1, "must be"); 3473 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file 3474 // will be overwritten no matter regardless of its contents 3475 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3476 } else { 3477 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa 3478 // is read from top.jsa 3479 // (a) 1 file: -XX:SharedArchiveFile=base.jsa 3480 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa 3481 // (c) 2 files: -XX:SharedArchiveFile=top.jsa 3482 // 3483 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not 3484 // allow cases (b) and (c). Case (b) is already checked above. 3485 3486 if (archives > 2) { 3487 vm_exit_during_initialization( 3488 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3489 } 3490 if (archives == 1) { 3491 char* base_archive_path = nullptr; 3492 bool success = 3493 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path); 3494 if (!success) { 3495 // If +AutoCreateSharedArchive and the specified shared archive does not exist, 3496 // regenerate the dynamic archive base on default archive. 3497 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) { 3498 CDSConfig::enable_dumping_dynamic_archive(); 3499 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile); 3500 SharedArchivePath = get_default_shared_archive_path(); 3501 SharedArchiveFile = nullptr; 3502 } else { 3503 if (AutoCreateSharedArchive) { 3504 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info."); 3505 AutoCreateSharedArchive = false; 3506 } 3507 no_shared_spaces("invalid archive"); 3508 } 3509 } else if (base_archive_path == nullptr) { 3510 // User has specified a single archive, which is a static archive. 3511 SharedArchivePath = const_cast<char *>(SharedArchiveFile); 3512 } else { 3513 // User has specified a single archive, which is a dynamic archive. 3514 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile); 3515 SharedArchivePath = base_archive_path; // has been c-heap allocated. 3516 } 3517 } else { 3518 extract_shared_archive_paths((const char*)SharedArchiveFile, 3519 &SharedArchivePath, &SharedDynamicArchivePath); 3520 if (SharedArchivePath == nullptr) { 3521 assert(SharedDynamicArchivePath == nullptr, "must be"); 3522 no_shared_spaces("invalid archive"); 3523 } 3524 } 3525 3526 if (SharedDynamicArchivePath != nullptr) { 3527 // Check for case (c) 3528 if (RecordDynamicDumpInfo) { 3529 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3530 SharedArchiveFile); 3531 } 3532 if (ArchiveClassesAtExit != nullptr) { 3533 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3534 SharedArchiveFile); 3535 } 3536 } 3537 3538 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3539 vm_exit_during_initialization( 3540 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3541 SharedArchiveFile); 3542 } 3543 } 3544 } 3545 } 3546 #endif // INCLUDE_CDS 3547 3548 #ifndef PRODUCT 3549 // Determine whether LogVMOutput should be implicitly turned on. 3550 static bool use_vm_log() { 3551 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3552 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3553 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3554 PrintAssembly || TraceDeoptimization || 3555 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3556 return true; 3557 } 3558 3559 #ifdef COMPILER1 3560 if (PrintC1Statistics) { 3561 return true; 3562 } 3563 #endif // COMPILER1 3564 3565 #ifdef COMPILER2 3566 if (PrintOptoAssembly || PrintOptoStatistics) { 3567 return true; 3568 } 3569 #endif // COMPILER2 3570 3571 return false; 3572 } 3573 3574 #endif // PRODUCT 3575 3576 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3577 for (int index = 0; index < args->nOptions; index++) { 3578 const JavaVMOption* option = args->options + index; 3579 const char* tail; 3580 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3581 return true; 3582 } 3583 } 3584 return false; 3585 } 3586 3587 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3588 const char* vm_options_file, 3589 const int vm_options_file_pos, 3590 ScopedVMInitArgs* vm_options_file_args, 3591 ScopedVMInitArgs* args_out) { 3592 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3593 if (code != JNI_OK) { 3594 return code; 3595 } 3596 3597 if (vm_options_file_args->get()->nOptions < 1) { 3598 return JNI_OK; 3599 } 3600 3601 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3602 jio_fprintf(defaultStream::error_stream(), 3603 "A VM options file may not refer to a VM options file. " 3604 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3605 "options file '%s' in options container '%s' is an error.\n", 3606 vm_options_file_args->vm_options_file_arg(), 3607 vm_options_file_args->container_name()); 3608 return JNI_EINVAL; 3609 } 3610 3611 return args_out->insert(args, vm_options_file_args->get(), 3612 vm_options_file_pos); 3613 } 3614 3615 // Expand -XX:VMOptionsFile found in args_in as needed. 3616 // mod_args and args_out parameters may return values as needed. 3617 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3618 ScopedVMInitArgs* mod_args, 3619 JavaVMInitArgs** args_out) { 3620 jint code = match_special_option_and_act(args_in, mod_args); 3621 if (code != JNI_OK) { 3622 return code; 3623 } 3624 3625 if (mod_args->is_set()) { 3626 // args_in contains -XX:VMOptionsFile and mod_args contains the 3627 // original options from args_in along with the options expanded 3628 // from the VMOptionsFile. Return a short-hand to the caller. 3629 *args_out = mod_args->get(); 3630 } else { 3631 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3632 } 3633 return JNI_OK; 3634 } 3635 3636 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3637 ScopedVMInitArgs* args_out) { 3638 // Remaining part of option string 3639 const char* tail; 3640 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3641 3642 for (int index = 0; index < args->nOptions; index++) { 3643 const JavaVMOption* option = args->options + index; 3644 if (match_option(option, "-XX:Flags=", &tail)) { 3645 Arguments::set_jvm_flags_file(tail); 3646 continue; 3647 } 3648 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3649 if (vm_options_file_args.found_vm_options_file_arg()) { 3650 jio_fprintf(defaultStream::error_stream(), 3651 "The option '%s' is already specified in the options " 3652 "container '%s' so the specification of '%s' in the " 3653 "same options container is an error.\n", 3654 vm_options_file_args.vm_options_file_arg(), 3655 vm_options_file_args.container_name(), 3656 option->optionString); 3657 return JNI_EINVAL; 3658 } 3659 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3660 // If there's a VMOptionsFile, parse that 3661 jint code = insert_vm_options_file(args, tail, index, 3662 &vm_options_file_args, args_out); 3663 if (code != JNI_OK) { 3664 return code; 3665 } 3666 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3667 if (args_out->is_set()) { 3668 // The VMOptions file inserted some options so switch 'args' 3669 // to the new set of options, and continue processing which 3670 // preserves "last option wins" semantics. 3671 args = args_out->get(); 3672 // The first option from the VMOptionsFile replaces the 3673 // current option. So we back track to process the 3674 // replacement option. 3675 index--; 3676 } 3677 continue; 3678 } 3679 if (match_option(option, "-XX:+PrintVMOptions")) { 3680 PrintVMOptions = true; 3681 continue; 3682 } 3683 if (match_option(option, "-XX:-PrintVMOptions")) { 3684 PrintVMOptions = false; 3685 continue; 3686 } 3687 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3688 IgnoreUnrecognizedVMOptions = true; 3689 continue; 3690 } 3691 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3692 IgnoreUnrecognizedVMOptions = false; 3693 continue; 3694 } 3695 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3696 JVMFlag::printFlags(tty, false); 3697 vm_exit(0); 3698 } 3699 3700 #ifndef PRODUCT 3701 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3702 JVMFlag::printFlags(tty, true); 3703 vm_exit(0); 3704 } 3705 #endif 3706 } 3707 return JNI_OK; 3708 } 3709 3710 static void print_options(const JavaVMInitArgs *args) { 3711 const char* tail; 3712 for (int index = 0; index < args->nOptions; index++) { 3713 const JavaVMOption *option = args->options + index; 3714 if (match_option(option, "-XX:", &tail)) { 3715 logOption(tail); 3716 } 3717 } 3718 } 3719 3720 bool Arguments::handle_deprecated_print_gc_flags() { 3721 if (PrintGC) { 3722 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3723 } 3724 if (PrintGCDetails) { 3725 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3726 } 3727 3728 if (_legacyGCLogging.lastFlag == 2) { 3729 // -Xloggc was used to specify a filename 3730 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3731 3732 LogTarget(Error, logging) target; 3733 LogStream errstream(target); 3734 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream); 3735 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3736 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3737 } 3738 return true; 3739 } 3740 3741 static void apply_debugger_ergo() { 3742 #ifndef PRODUCT 3743 // UseDebuggerErgo is notproduct 3744 if (ReplayCompiles) { 3745 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3746 } 3747 #endif 3748 3749 #ifndef PRODUCT 3750 if (UseDebuggerErgo) { 3751 // Turn on sub-flags 3752 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3753 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3754 } 3755 #endif 3756 3757 if (UseDebuggerErgo2) { 3758 // Debugging with limited number of CPUs 3759 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3760 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3761 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3762 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3763 } 3764 } 3765 3766 // Parse entry point called from JNI_CreateJavaVM 3767 3768 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3769 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3770 JVMFlag::check_all_flag_declarations(); 3771 3772 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3773 const char* hotspotrc = ".hotspotrc"; 3774 bool settings_file_specified = false; 3775 bool needs_hotspotrc_warning = false; 3776 ScopedVMInitArgs initial_vm_options_args(""); 3777 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3778 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3779 3780 // Pointers to current working set of containers 3781 JavaVMInitArgs* cur_cmd_args; 3782 JavaVMInitArgs* cur_vm_options_args; 3783 JavaVMInitArgs* cur_java_options_args; 3784 JavaVMInitArgs* cur_java_tool_options_args; 3785 3786 // Containers for modified/expanded options 3787 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3788 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3789 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3790 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3791 3792 3793 jint code = 3794 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3795 if (code != JNI_OK) { 3796 return code; 3797 } 3798 3799 code = parse_java_options_environment_variable(&initial_java_options_args); 3800 if (code != JNI_OK) { 3801 return code; 3802 } 3803 3804 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3805 char *vmoptions = ClassLoader::lookup_vm_options(); 3806 if (vmoptions != nullptr) { 3807 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3808 FREE_C_HEAP_ARRAY(char, vmoptions); 3809 if (code != JNI_OK) { 3810 return code; 3811 } 3812 } 3813 3814 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3815 &mod_java_tool_options_args, 3816 &cur_java_tool_options_args); 3817 if (code != JNI_OK) { 3818 return code; 3819 } 3820 3821 code = expand_vm_options_as_needed(initial_cmd_args, 3822 &mod_cmd_args, 3823 &cur_cmd_args); 3824 if (code != JNI_OK) { 3825 return code; 3826 } 3827 3828 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3829 &mod_java_options_args, 3830 &cur_java_options_args); 3831 if (code != JNI_OK) { 3832 return code; 3833 } 3834 3835 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3836 &mod_vm_options_args, 3837 &cur_vm_options_args); 3838 if (code != JNI_OK) { 3839 return code; 3840 } 3841 3842 const char* flags_file = Arguments::get_jvm_flags_file(); 3843 settings_file_specified = (flags_file != nullptr); 3844 3845 if (IgnoreUnrecognizedVMOptions) { 3846 cur_cmd_args->ignoreUnrecognized = true; 3847 cur_java_tool_options_args->ignoreUnrecognized = true; 3848 cur_java_options_args->ignoreUnrecognized = true; 3849 } 3850 3851 // Parse specified settings file 3852 if (settings_file_specified) { 3853 if (!process_settings_file(flags_file, true, 3854 cur_cmd_args->ignoreUnrecognized)) { 3855 return JNI_EINVAL; 3856 } 3857 } else { 3858 #ifdef ASSERT 3859 // Parse default .hotspotrc settings file 3860 if (!process_settings_file(".hotspotrc", false, 3861 cur_cmd_args->ignoreUnrecognized)) { 3862 return JNI_EINVAL; 3863 } 3864 #else 3865 struct stat buf; 3866 if (os::stat(hotspotrc, &buf) == 0) { 3867 needs_hotspotrc_warning = true; 3868 } 3869 #endif 3870 } 3871 3872 if (PrintVMOptions) { 3873 print_options(cur_java_tool_options_args); 3874 print_options(cur_cmd_args); 3875 print_options(cur_java_options_args); 3876 } 3877 3878 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3879 jint result = parse_vm_init_args(cur_vm_options_args, 3880 cur_java_tool_options_args, 3881 cur_java_options_args, 3882 cur_cmd_args); 3883 3884 if (result != JNI_OK) { 3885 return result; 3886 } 3887 3888 // Delay warning until here so that we've had a chance to process 3889 // the -XX:-PrintWarnings flag 3890 if (needs_hotspotrc_warning) { 3891 warning("%s file is present but has been ignored. " 3892 "Run with -XX:Flags=%s to load the file.", 3893 hotspotrc, hotspotrc); 3894 } 3895 3896 if (needs_module_property_warning) { 3897 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3898 " names that are reserved for internal use."); 3899 } 3900 3901 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3902 UNSUPPORTED_OPTION(UseLargePages); 3903 #endif 3904 3905 #if defined(AIX) 3906 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3907 #endif 3908 3909 #ifndef PRODUCT 3910 if (TraceBytecodesAt != 0) { 3911 TraceBytecodes = true; 3912 } 3913 #endif // PRODUCT 3914 3915 if (ScavengeRootsInCode == 0) { 3916 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3917 warning("Forcing ScavengeRootsInCode non-zero"); 3918 } 3919 ScavengeRootsInCode = 1; 3920 } 3921 3922 if (!handle_deprecated_print_gc_flags()) { 3923 return JNI_EINVAL; 3924 } 3925 3926 // Set object alignment values. 3927 set_object_alignment(); 3928 3929 #if !INCLUDE_CDS 3930 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) { 3931 jio_fprintf(defaultStream::error_stream(), 3932 "Shared spaces are not supported in this VM\n"); 3933 return JNI_ERR; 3934 } 3935 if (DumpLoadedClassList != nullptr) { 3936 jio_fprintf(defaultStream::error_stream(), 3937 "DumpLoadedClassList is not supported in this VM\n"); 3938 return JNI_ERR; 3939 } 3940 if ((UseSharedSpaces && xshare_auto_cmd_line) || 3941 log_is_enabled(Info, cds)) { 3942 warning("Shared spaces are not supported in this VM"); 3943 UseSharedSpaces = false; 3944 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3945 } 3946 no_shared_spaces("CDS Disabled"); 3947 #endif // INCLUDE_CDS 3948 3949 // Verify NMT arguments 3950 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 3951 if (lvl == NMT_unknown) { 3952 jio_fprintf(defaultStream::error_stream(), 3953 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n"); 3954 return JNI_ERR; 3955 } 3956 if (PrintNMTStatistics && lvl == NMT_off) { 3957 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 3958 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 3959 } 3960 3961 bool trace_dependencies = log_is_enabled(Debug, dependencies); 3962 if (trace_dependencies && VerifyDependencies) { 3963 warning("dependency logging results may be inflated by VerifyDependencies"); 3964 } 3965 3966 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) || 3967 log_is_enabled(Info, class, load, cause); 3968 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) { 3969 warning("class load cause logging will not produce output without LogClassLoadingCauseFor"); 3970 } 3971 3972 apply_debugger_ergo(); 3973 3974 if (log_is_enabled(Info, arguments)) { 3975 LogStream st(Log(arguments)::info()); 3976 Arguments::print_on(&st); 3977 } 3978 3979 return JNI_OK; 3980 } 3981 3982 jint Arguments::apply_ergo() { 3983 // Set flags based on ergonomics. 3984 jint result = set_ergonomics_flags(); 3985 if (result != JNI_OK) return result; 3986 3987 // Set heap size based on available physical memory 3988 set_heap_size(); 3989 3990 GCConfig::arguments()->initialize(); 3991 3992 set_shared_spaces_flags_and_archive_paths(); 3993 3994 // Initialize Metaspace flags and alignments 3995 Metaspace::ergo_initialize(); 3996 3997 if (!StringDedup::ergo_initialize()) { 3998 return JNI_EINVAL; 3999 } 4000 4001 // Set compiler flags after GC is selected and GC specific 4002 // flags (LoopStripMiningIter) are set. 4003 CompilerConfig::ergo_initialize(); 4004 4005 // Set bytecode rewriting flags 4006 set_bytecode_flags(); 4007 4008 // Set flags if aggressive optimization flags are enabled 4009 jint code = set_aggressive_opts_flags(); 4010 if (code != JNI_OK) { 4011 return code; 4012 } 4013 4014 #ifdef ZERO 4015 // Clear flags not supported on zero. 4016 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4017 #endif // ZERO 4018 4019 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4020 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4021 DebugNonSafepoints = true; 4022 } 4023 4024 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4025 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4026 } 4027 4028 // Treat the odd case where local verification is enabled but remote 4029 // verification is not as if both were enabled. 4030 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4031 log_info(verification)("Turning on remote verification because local verification is on"); 4032 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4033 } 4034 4035 #ifndef PRODUCT 4036 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4037 if (use_vm_log()) { 4038 LogVMOutput = true; 4039 } 4040 } 4041 #endif // PRODUCT 4042 4043 if (PrintCommandLineFlags) { 4044 JVMFlag::printSetFlags(tty); 4045 } 4046 4047 #if COMPILER2_OR_JVMCI 4048 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 4049 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 4050 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 4051 } 4052 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 4053 4054 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 4055 if (!EnableVectorReboxing) { 4056 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 4057 } else { 4058 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 4059 } 4060 } 4061 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 4062 4063 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 4064 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 4065 } 4066 FLAG_SET_DEFAULT(UseVectorStubs, false); 4067 } 4068 #endif // COMPILER2_OR_JVMCI 4069 4070 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 4071 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 4072 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 4073 } 4074 } 4075 return JNI_OK; 4076 } 4077 4078 jint Arguments::adjust_after_os() { 4079 if (UseNUMA) { 4080 if (UseParallelGC) { 4081 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4082 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4083 } 4084 } 4085 } 4086 return JNI_OK; 4087 } 4088 4089 int Arguments::PropertyList_count(SystemProperty* pl) { 4090 int count = 0; 4091 while(pl != nullptr) { 4092 count++; 4093 pl = pl->next(); 4094 } 4095 return count; 4096 } 4097 4098 // Return the number of readable properties. 4099 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4100 int count = 0; 4101 while(pl != nullptr) { 4102 if (pl->readable()) { 4103 count++; 4104 } 4105 pl = pl->next(); 4106 } 4107 return count; 4108 } 4109 4110 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4111 assert(key != nullptr, "just checking"); 4112 SystemProperty* prop; 4113 for (prop = pl; prop != nullptr; prop = prop->next()) { 4114 if (strcmp(key, prop->key()) == 0) return prop->value(); 4115 } 4116 return nullptr; 4117 } 4118 4119 // Return the value of the requested property provided that it is a readable property. 4120 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4121 assert(key != nullptr, "just checking"); 4122 SystemProperty* prop; 4123 // Return the property value if the keys match and the property is not internal or 4124 // it's the special internal property "jdk.boot.class.path.append". 4125 for (prop = pl; prop != nullptr; prop = prop->next()) { 4126 if (strcmp(key, prop->key()) == 0) { 4127 if (!prop->internal()) { 4128 return prop->value(); 4129 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4130 return prop->value(); 4131 } else { 4132 // Property is internal and not jdk.boot.class.path.append so return null. 4133 return nullptr; 4134 } 4135 } 4136 } 4137 return nullptr; 4138 } 4139 4140 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4141 SystemProperty* p = *plist; 4142 if (p == nullptr) { 4143 *plist = new_p; 4144 } else { 4145 while (p->next() != nullptr) { 4146 p = p->next(); 4147 } 4148 p->set_next(new_p); 4149 } 4150 } 4151 4152 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4153 bool writeable, bool internal) { 4154 if (plist == nullptr) 4155 return; 4156 4157 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4158 PropertyList_add(plist, new_p); 4159 } 4160 4161 void Arguments::PropertyList_add(SystemProperty *element) { 4162 PropertyList_add(&_system_properties, element); 4163 } 4164 4165 // This add maintains unique property key in the list. 4166 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4167 PropertyAppendable append, PropertyWriteable writeable, 4168 PropertyInternal internal) { 4169 if (plist == nullptr) 4170 return; 4171 4172 // If property key exists and is writeable, then update with new value. 4173 // Trying to update a non-writeable property is silently ignored. 4174 SystemProperty* prop; 4175 for (prop = *plist; prop != nullptr; prop = prop->next()) { 4176 if (strcmp(k, prop->key()) == 0) { 4177 if (append == AppendProperty) { 4178 prop->append_writeable_value(v); 4179 } else { 4180 prop->set_writeable_value(v); 4181 } 4182 return; 4183 } 4184 } 4185 4186 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4187 } 4188 4189 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4190 // Returns true if all of the source pointed by src has been copied over to 4191 // the destination buffer pointed by buf. Otherwise, returns false. 4192 // Notes: 4193 // 1. If the length (buflen) of the destination buffer excluding the 4194 // null terminator character is not long enough for holding the expanded 4195 // pid characters, it also returns false instead of returning the partially 4196 // expanded one. 4197 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4198 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4199 char* buf, size_t buflen) { 4200 const char* p = src; 4201 char* b = buf; 4202 const char* src_end = &src[srclen]; 4203 char* buf_end = &buf[buflen - 1]; 4204 4205 while (p < src_end && b < buf_end) { 4206 if (*p == '%') { 4207 switch (*(++p)) { 4208 case '%': // "%%" ==> "%" 4209 *b++ = *p++; 4210 break; 4211 case 'p': { // "%p" ==> current process id 4212 // buf_end points to the character before the last character so 4213 // that we could write '\0' to the end of the buffer. 4214 size_t buf_sz = buf_end - b + 1; 4215 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4216 4217 // if jio_snprintf fails or the buffer is not long enough to hold 4218 // the expanded pid, returns false. 4219 if (ret < 0 || ret >= (int)buf_sz) { 4220 return false; 4221 } else { 4222 b += ret; 4223 assert(*b == '\0', "fail in copy_expand_pid"); 4224 if (p == src_end && b == buf_end + 1) { 4225 // reach the end of the buffer. 4226 return true; 4227 } 4228 } 4229 p++; 4230 break; 4231 } 4232 default : 4233 *b++ = '%'; 4234 } 4235 } else { 4236 *b++ = *p++; 4237 } 4238 } 4239 *b = '\0'; 4240 return (p == src_end); // return false if not all of the source was copied 4241 }