1 /* 2 * Copyright (c) 1997, 2024, 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 #include <string.h> 78 79 static const char _default_java_launcher[] = "generic"; 80 81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher 82 83 char* Arguments::_jvm_flags_file = nullptr; 84 char** Arguments::_jvm_flags_array = nullptr; 85 int Arguments::_num_jvm_flags = 0; 86 char** Arguments::_jvm_args_array = nullptr; 87 int Arguments::_num_jvm_args = 0; 88 char* Arguments::_java_command = nullptr; 89 SystemProperty* Arguments::_system_properties = nullptr; 90 size_t Arguments::_conservative_max_heap_alignment = 0; 91 Arguments::Mode Arguments::_mode = _mixed; 92 const char* Arguments::_java_vendor_url_bug = nullptr; 93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 94 bool Arguments::_sun_java_launcher_is_altjvm = false; 95 96 // These parameters are reset in method parse_vm_init_args() 97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 99 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 100 bool Arguments::_ClipInlining = ClipInlining; 101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 102 103 bool Arguments::_enable_preview = false; 104 105 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 }; 106 107 // These are not set by the JDK's built-in launchers, but they can be set by 108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 109 // JavaVMOption in jni.h. 110 abort_hook_t Arguments::_abort_hook = nullptr; 111 exit_hook_t Arguments::_exit_hook = nullptr; 112 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr; 113 114 115 SystemProperty *Arguments::_sun_boot_library_path = nullptr; 116 SystemProperty *Arguments::_java_library_path = nullptr; 117 SystemProperty *Arguments::_java_home = nullptr; 118 SystemProperty *Arguments::_java_class_path = nullptr; 119 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr; 120 SystemProperty *Arguments::_vm_info = nullptr; 121 122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr; 123 PathString *Arguments::_boot_class_path = nullptr; 124 bool Arguments::_has_jimage = false; 125 126 char* Arguments::_ext_dirs = nullptr; 127 128 // True if -Xshare:auto option was specified. 129 static bool xshare_auto_cmd_line = false; 130 131 // True if -Xint/-Xmixed/-Xcomp were specified 132 static bool mode_flag_cmd_line = false; 133 134 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 135 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 136 if (new_value == nullptr) { 137 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 138 return false; 139 } 140 if (_value != nullptr) { 141 FreeHeap(_value); 142 } 143 _value = new_value; 144 strcpy(_value, value); 145 return true; 146 } 147 148 void PathString::append_value(const char *value) { 149 char *sp; 150 size_t len = 0; 151 if (value != nullptr) { 152 len = strlen(value); 153 if (_value != nullptr) { 154 len += strlen(_value); 155 } 156 sp = AllocateHeap(len+2, mtArguments); 157 assert(sp != nullptr, "Unable to allocate space for new append path value"); 158 if (sp != nullptr) { 159 if (_value != nullptr) { 160 strcpy(sp, _value); 161 strcat(sp, os::path_separator()); 162 strcat(sp, value); 163 FreeHeap(_value); 164 } else { 165 strcpy(sp, value); 166 } 167 _value = sp; 168 } 169 } 170 } 171 172 PathString::PathString(const char* value) { 173 if (value == nullptr) { 174 _value = nullptr; 175 } else { 176 _value = AllocateHeap(strlen(value)+1, mtArguments); 177 strcpy(_value, value); 178 } 179 } 180 181 PathString::~PathString() { 182 if (_value != nullptr) { 183 FreeHeap(_value); 184 _value = nullptr; 185 } 186 } 187 188 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 189 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value"); 190 size_t len = strlen(module_name) + 1; 191 _module_name = AllocateHeap(len, mtInternal); 192 strncpy(_module_name, module_name, len); // copy the trailing null 193 _path = new PathString(path); 194 } 195 196 ModulePatchPath::~ModulePatchPath() { 197 if (_module_name != nullptr) { 198 FreeHeap(_module_name); 199 _module_name = nullptr; 200 } 201 if (_path != nullptr) { 202 delete _path; 203 _path = nullptr; 204 } 205 } 206 207 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 208 if (key == nullptr) { 209 _key = nullptr; 210 } else { 211 _key = AllocateHeap(strlen(key)+1, mtArguments); 212 strcpy(_key, key); 213 } 214 _next = nullptr; 215 _internal = internal; 216 _writeable = writeable; 217 } 218 219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 220 // part of the option string. 221 static bool match_option(const JavaVMOption *option, const char* name, 222 const char** tail) { 223 size_t len = strlen(name); 224 if (strncmp(option->optionString, name, len) == 0) { 225 *tail = option->optionString + len; 226 return true; 227 } else { 228 return false; 229 } 230 } 231 232 // Check if 'option' matches 'name'. No "tail" is allowed. 233 static bool match_option(const JavaVMOption *option, const char* name) { 234 const char* tail = nullptr; 235 bool result = match_option(option, name, &tail); 236 if (tail != nullptr && *tail == '\0') { 237 return result; 238 } else { 239 return false; 240 } 241 } 242 243 // Return true if any of the strings in null-terminated array 'names' matches. 244 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 245 // the option must match exactly. 246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 247 bool tail_allowed) { 248 for (/* empty */; *names != nullptr; ++names) { 249 if (match_option(option, *names, tail)) { 250 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 251 return true; 252 } 253 } 254 } 255 return false; 256 } 257 258 #if INCLUDE_JFR 259 static bool _has_jfr_option = false; // is using JFR 260 261 // return true on failure 262 static bool match_jfr_option(const JavaVMOption** option) { 263 assert((*option)->optionString != nullptr, "invariant"); 264 char* tail = nullptr; 265 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 266 _has_jfr_option = true; 267 return Jfr::on_start_flight_recording_option(option, tail); 268 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 269 _has_jfr_option = true; 270 return Jfr::on_flight_recorder_option(option, tail); 271 } 272 return false; 273 } 274 275 bool Arguments::has_jfr_option() { 276 return _has_jfr_option; 277 } 278 #endif 279 280 static void logOption(const char* opt) { 281 if (PrintVMOptions) { 282 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 283 } 284 } 285 286 bool needs_module_property_warning = false; 287 288 #define MODULE_PROPERTY_PREFIX "jdk.module." 289 #define MODULE_PROPERTY_PREFIX_LEN 11 290 #define ADDEXPORTS "addexports" 291 #define ADDEXPORTS_LEN 10 292 #define ADDREADS "addreads" 293 #define ADDREADS_LEN 8 294 #define ADDOPENS "addopens" 295 #define ADDOPENS_LEN 8 296 #define PATCH "patch" 297 #define PATCH_LEN 5 298 #define ADDMODS "addmods" 299 #define ADDMODS_LEN 7 300 #define LIMITMODS "limitmods" 301 #define LIMITMODS_LEN 9 302 #define PATH "path" 303 #define PATH_LEN 4 304 #define UPGRADE_PATH "upgrade.path" 305 #define UPGRADE_PATH_LEN 12 306 #define ENABLE_NATIVE_ACCESS "enable.native.access" 307 #define ENABLE_NATIVE_ACCESS_LEN 20 308 309 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 310 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 311 return ((strncmp(option, property, len) == 0) && 312 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 313 } 314 315 // Return true if property starts with "jdk.module." and its ensuing chars match 316 // any of the reserved module properties. 317 // property should be passed without the leading "-D". 318 bool Arguments::is_internal_module_property(const char* property) { 319 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 320 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 321 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 322 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 323 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 324 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 325 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 326 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 327 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 328 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 329 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 330 return true; 331 } 332 } 333 return false; 334 } 335 336 // Process java launcher properties. 337 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 338 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 339 // Must do this before setting up other system properties, 340 // as some of them may depend on launcher type. 341 for (int index = 0; index < args->nOptions; index++) { 342 const JavaVMOption* option = args->options + index; 343 const char* tail; 344 345 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 346 process_java_launcher_argument(tail, option->extraInfo); 347 continue; 348 } 349 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 350 if (strcmp(tail, "true") == 0) { 351 _sun_java_launcher_is_altjvm = true; 352 } 353 continue; 354 } 355 } 356 } 357 358 // Initialize system properties key and value. 359 void Arguments::init_system_properties() { 360 361 // Set up _boot_class_path which is not a property but 362 // relies heavily on argument processing and the jdk.boot.class.path.append 363 // property. It is used to store the underlying boot class path. 364 _boot_class_path = new PathString(nullptr); 365 366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 367 "Java Virtual Machine Specification", false)); 368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 370 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 371 372 // Initialize the vm.info now, but it will need updating after argument parsing. 373 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 374 375 // Following are JVMTI agent writable properties. 376 // Properties values are set to nullptr and they are 377 // os specific they are initialized in os::init_system_properties_values(). 378 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true); 379 _java_library_path = new SystemProperty("java.library.path", nullptr, true); 380 _java_home = new SystemProperty("java.home", nullptr, true); 381 _java_class_path = new SystemProperty("java.class.path", "", true); 382 // jdk.boot.class.path.append is a non-writeable, internal property. 383 // It can only be set by either: 384 // - -Xbootclasspath/a: 385 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 386 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true); 387 388 // Add to System Property list. 389 PropertyList_add(&_system_properties, _sun_boot_library_path); 390 PropertyList_add(&_system_properties, _java_library_path); 391 PropertyList_add(&_system_properties, _java_home); 392 PropertyList_add(&_system_properties, _java_class_path); 393 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 394 PropertyList_add(&_system_properties, _vm_info); 395 396 // Set OS specific system properties values 397 os::init_system_properties_values(); 398 } 399 400 // Update/Initialize System properties after JDK version number is known 401 void Arguments::init_version_specific_system_properties() { 402 enum { bufsz = 16 }; 403 char buffer[bufsz]; 404 const char* spec_vendor = "Oracle Corporation"; 405 uint32_t spec_version = JDK_Version::current().major_version(); 406 407 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 408 409 PropertyList_add(&_system_properties, 410 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 411 PropertyList_add(&_system_properties, 412 new SystemProperty("java.vm.specification.version", buffer, false)); 413 PropertyList_add(&_system_properties, 414 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 415 } 416 417 /* 418 * -XX argument processing: 419 * 420 * -XX arguments are defined in several places, such as: 421 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 422 * -XX arguments are parsed in parse_argument(). 423 * -XX argument bounds checking is done in check_vm_args_consistency(). 424 * 425 * Over time -XX arguments may change. There are mechanisms to handle common cases: 426 * 427 * ALIASED: An option that is simply another name for another option. This is often 428 * part of the process of deprecating a flag, but not all aliases need 429 * to be deprecated. 430 * 431 * Create an alias for an option by adding the old and new option names to the 432 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 433 * 434 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 435 * support may be removed in the future. Both regular and aliased options may be 436 * deprecated. 437 * 438 * Add a deprecation warning for an option (or alias) by adding an entry in the 439 * "special_jvm_flags" table and setting the "deprecated_in" field. 440 * Often an option "deprecated" in one major release will 441 * be made "obsolete" in the next. In this case the entry should also have its 442 * "obsolete_in" field set. 443 * 444 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 445 * on the command line. A warning is printed to let the user know that option might not 446 * be accepted in the future. 447 * 448 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 449 * table and setting the "obsolete_in" field. 450 * 451 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 452 * to the current JDK version. The system will flatly refuse to admit the existence of 453 * the flag. This allows a flag to die automatically over JDK releases. 454 * 455 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 456 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 457 * - Newly obsolete or expired deprecated options should have their global variable 458 * definitions removed (from globals.hpp, etc) and related implementations removed. 459 * 460 * Recommended approach for removing options: 461 * 462 * To remove options commonly used by customers (e.g. product -XX options), use 463 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 464 * 465 * To remove internal options (e.g. diagnostic, experimental, develop options), use 466 * a 2-step model adding major release numbers to the obsolete and expire columns. 467 * 468 * To change the name of an option, use the alias table as well as a 2-step 469 * model adding major release numbers to the deprecate and expire columns. 470 * Think twice about aliasing commonly used customer options. 471 * 472 * There are times when it is appropriate to leave a future release number as undefined. 473 * 474 * Tests: Aliases should be tested in VMAliasOptions.java. 475 * Deprecated options should be tested in VMDeprecatedOptions.java. 476 */ 477 478 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 479 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 480 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 481 // the command-line as usual, but will issue a warning. 482 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 483 // the command-line, while issuing a warning and ignoring the flag value. 484 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 485 // existence of the flag. 486 // 487 // MANUAL CLEANUP ON JDK VERSION UPDATES: 488 // This table ensures that the handling of options will update automatically when the JDK 489 // version is incremented, but the source code needs to be cleanup up manually: 490 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 491 // variable should be removed, as well as users of the variable. 492 // - As "deprecated" options age into "obsolete" options, move the entry into the 493 // "Obsolete Flags" section of the table. 494 // - All expired options should be removed from the table. 495 static SpecialFlag const special_jvm_flags[] = { 496 // -------------- Deprecated Flags -------------- 497 // --- Non-alias flags - sorted by obsolete_in then expired_in: 498 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 499 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 500 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() }, 501 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 502 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 503 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 504 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 505 { "RegisterFinalizersAtInit", JDK_Version::jdk(22), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 506 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 507 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 508 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 509 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 510 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 511 #if defined(X86) 512 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 513 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 514 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 515 #endif // X86 516 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 517 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 518 519 // -------------- Obsolete Flags - sorted by expired_in -------------- 520 521 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 522 523 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) }, 524 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) }, 525 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) }, 526 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) }, 527 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) }, 528 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::jdk(24) }, 529 530 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) }, 531 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) }, 532 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(24) }, 533 534 { "AdaptiveSizePolicyCollectionCostMargin", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 535 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 536 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 537 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 538 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 539 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 540 { "TLABStats", JDK_Version::jdk(12), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 541 { "GCLockerEdenExpansionPercent", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 542 { "NUMAPageScanRate", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 543 { "ProcessDistributionStride", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 544 545 { "ParallelOldDeadWoodLimiterMean", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 546 { "ParallelOldDeadWoodLimiterStdDev", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 547 { "UseNeon", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 548 { "ScavengeBeforeFullGC", JDK_Version::undefined(), JDK_Version::jdk(23), JDK_Version::jdk(24) }, 549 #ifdef ASSERT 550 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 551 #endif 552 553 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 554 // These entries will generate build errors. Their purpose is to test the macros. 555 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 556 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 557 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 558 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 559 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 560 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 561 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 562 #endif 563 564 { nullptr, JDK_Version(0), JDK_Version(0) } 565 }; 566 567 // Flags that are aliases for other flags. 568 typedef struct { 569 const char* alias_name; 570 const char* real_name; 571 } AliasedFlag; 572 573 static AliasedFlag const aliased_jvm_flags[] = { 574 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 575 { nullptr, nullptr} 576 }; 577 578 // Return true if "v" is less than "other", where "other" may be "undefined". 579 static bool version_less_than(JDK_Version v, JDK_Version other) { 580 assert(!v.is_undefined(), "must be defined"); 581 if (!other.is_undefined() && v.compare(other) >= 0) { 582 return false; 583 } else { 584 return true; 585 } 586 } 587 588 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 589 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 590 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 591 flag = special_jvm_flags[i]; 592 return true; 593 } 594 } 595 return false; 596 } 597 598 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 599 assert(version != nullptr, "Must provide a version buffer"); 600 SpecialFlag flag; 601 if (lookup_special_flag(flag_name, flag)) { 602 if (!flag.obsolete_in.is_undefined()) { 603 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 604 *version = flag.obsolete_in; 605 // This flag may have been marked for obsoletion in this version, but we may not 606 // have actually removed it yet. Rather than ignoring it as soon as we reach 607 // this version we allow some time for the removal to happen. So if the flag 608 // still actually exists we process it as normal, but issue an adjusted warning. 609 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 610 if (real_flag != nullptr) { 611 char version_str[256]; 612 version->to_string(version_str, sizeof(version_str)); 613 warning("Temporarily processing option %s; support is scheduled for removal in %s", 614 flag_name, version_str); 615 return false; 616 } 617 return true; 618 } 619 } 620 } 621 return false; 622 } 623 624 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 625 assert(version != nullptr, "Must provide a version buffer"); 626 SpecialFlag flag; 627 if (lookup_special_flag(flag_name, flag)) { 628 if (!flag.deprecated_in.is_undefined()) { 629 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 630 version_less_than(JDK_Version::current(), flag.expired_in)) { 631 *version = flag.deprecated_in; 632 return 1; 633 } else { 634 return -1; 635 } 636 } 637 } 638 return 0; 639 } 640 641 const char* Arguments::real_flag_name(const char *flag_name) { 642 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) { 643 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 644 if (strcmp(flag_status.alias_name, flag_name) == 0) { 645 return flag_status.real_name; 646 } 647 } 648 return flag_name; 649 } 650 651 #ifdef ASSERT 652 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 653 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 654 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 655 return true; 656 } 657 } 658 return false; 659 } 660 661 // Verifies the correctness of the entries in the special_jvm_flags table. 662 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 663 // version being earlier than the deprecation version, then a warning is issued 664 // and verification fails - by returning false. If it is detected that the table 665 // is out of date, with respect to the current version, then ideally a warning is 666 // issued but verification does not fail. This allows the VM to operate when the 667 // version is first updated, without needing to update all the impacted flags at 668 // the same time. In practice we can't issue the warning immediately when the version 669 // is updated as it occurs for every test and some tests are not prepared to handle 670 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 671 // if the check_globals flag is true, and in addition allow a grace period and only 672 // check for stale flags when we hit build 25 (which is far enough into the 6 month 673 // release cycle that all flag updates should have been processed, whilst still 674 // leaving time to make the change before RDP2). 675 // We use a gtest to call this, passing true, so that we can detect stale flags before 676 // the end of the release cycle. 677 678 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 679 680 bool Arguments::verify_special_jvm_flags(bool check_globals) { 681 bool success = true; 682 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 683 const SpecialFlag& flag = special_jvm_flags[i]; 684 if (lookup_special_flag(flag.name, i)) { 685 warning("Duplicate special flag declaration \"%s\"", flag.name); 686 success = false; 687 } 688 if (flag.deprecated_in.is_undefined() && 689 flag.obsolete_in.is_undefined()) { 690 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 691 success = false; 692 } 693 694 if (!flag.deprecated_in.is_undefined()) { 695 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 696 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 697 success = false; 698 } 699 700 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 701 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 702 success = false; 703 } 704 } 705 706 if (!flag.obsolete_in.is_undefined()) { 707 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 708 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 709 success = false; 710 } 711 712 // if flag has become obsolete it should not have a "globals" flag defined anymore. 713 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 714 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 715 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 716 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 717 success = false; 718 } 719 } 720 721 } else if (!flag.expired_in.is_undefined()) { 722 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 723 success = false; 724 } 725 726 if (!flag.expired_in.is_undefined()) { 727 // if flag has become expired it should not have a "globals" flag defined anymore. 728 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 729 !version_less_than(JDK_Version::current(), flag.expired_in)) { 730 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 731 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 732 success = false; 733 } 734 } 735 } 736 } 737 return success; 738 } 739 #endif 740 741 bool Arguments::atojulong(const char *s, julong* result) { 742 return parse_integer(s, result); 743 } 744 745 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 746 if (size < min_size) return arg_too_small; 747 if (size > max_size) return arg_too_big; 748 return arg_in_range; 749 } 750 751 // Describe an argument out of range error 752 void Arguments::describe_range_error(ArgsRange errcode) { 753 switch(errcode) { 754 case arg_too_big: 755 jio_fprintf(defaultStream::error_stream(), 756 "The specified size exceeds the maximum " 757 "representable size.\n"); 758 break; 759 case arg_too_small: 760 case arg_unreadable: 761 case arg_in_range: 762 // do nothing for now 763 break; 764 default: 765 ShouldNotReachHere(); 766 } 767 } 768 769 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 770 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 771 return true; 772 } else { 773 return false; 774 } 775 } 776 777 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 778 // strtod allows leading whitespace, but our flag format does not. 779 if (*value == '\0' || isspace(*value)) { 780 return false; 781 } 782 char* end; 783 errno = 0; 784 double v = strtod(value, &end); 785 if ((errno != 0) || (*end != 0)) { 786 return false; 787 } 788 if (g_isnan(v) || !g_isfinite(v)) { 789 // Currently we cannot handle these special values. 790 return false; 791 } 792 793 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 794 return true; 795 } 796 return false; 797 } 798 799 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 800 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 801 802 if (flag->is_int()) { 803 int v; 804 if (parse_integer(value, &v)) { 805 result = JVMFlagAccess::set_int(flag, &v, origin); 806 } 807 } else if (flag->is_uint()) { 808 uint v; 809 if (parse_integer(value, &v)) { 810 result = JVMFlagAccess::set_uint(flag, &v, origin); 811 } 812 } else if (flag->is_intx()) { 813 intx v; 814 if (parse_integer(value, &v)) { 815 result = JVMFlagAccess::set_intx(flag, &v, origin); 816 } 817 } else if (flag->is_uintx()) { 818 uintx v; 819 if (parse_integer(value, &v)) { 820 result = JVMFlagAccess::set_uintx(flag, &v, origin); 821 } 822 } else if (flag->is_uint64_t()) { 823 uint64_t v; 824 if (parse_integer(value, &v)) { 825 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 826 } 827 } else if (flag->is_size_t()) { 828 size_t v; 829 if (parse_integer(value, &v)) { 830 result = JVMFlagAccess::set_size_t(flag, &v, origin); 831 } 832 } 833 834 return result == JVMFlag::SUCCESS; 835 } 836 837 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 838 if (value[0] == '\0') { 839 value = nullptr; 840 } 841 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 842 // Contract: JVMFlag always returns a pointer that needs freeing. 843 FREE_C_HEAP_ARRAY(char, value); 844 return true; 845 } 846 847 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 848 const char* old_value = ""; 849 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 850 size_t old_len = old_value != nullptr ? strlen(old_value) : 0; 851 size_t new_len = strlen(new_value); 852 const char* value; 853 char* free_this_too = nullptr; 854 if (old_len == 0) { 855 value = new_value; 856 } else if (new_len == 0) { 857 value = old_value; 858 } else { 859 size_t length = old_len + 1 + new_len + 1; 860 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 861 // each new setting adds another LINE to the switch: 862 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 863 value = buf; 864 free_this_too = buf; 865 } 866 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 867 // JVMFlag always returns a pointer that needs freeing. 868 FREE_C_HEAP_ARRAY(char, value); 869 // JVMFlag made its own copy, so I must delete my own temp. buffer. 870 FREE_C_HEAP_ARRAY(char, free_this_too); 871 return true; 872 } 873 874 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 875 const char* real_name = real_flag_name(arg); 876 JDK_Version since = JDK_Version(); 877 switch (is_deprecated_flag(arg, &since)) { 878 case -1: { 879 // Obsolete or expired, so don't process normally, 880 // but allow for an obsolete flag we're still 881 // temporarily allowing. 882 if (!is_obsolete_flag(arg, &since)) { 883 return real_name; 884 } 885 // Note if we're not considered obsolete then we can't be expired either 886 // as obsoletion must come first. 887 return nullptr; 888 } 889 case 0: 890 return real_name; 891 case 1: { 892 char version[256]; 893 since.to_string(version, sizeof(version)); 894 if (real_name != arg) { 895 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 896 arg, version, real_name); 897 } else { 898 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 899 arg, version); 900 } 901 return real_name; 902 } 903 } 904 ShouldNotReachHere(); 905 return nullptr; 906 } 907 908 #define BUFLEN 255 909 910 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 911 char name_copied[BUFLEN+1]; 912 if (name[name_length] != 0) { 913 if (name_length > BUFLEN) { 914 return nullptr; 915 } else { 916 strncpy(name_copied, name, name_length); 917 name_copied[name_length] = '\0'; 918 name = name_copied; 919 } 920 } 921 922 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 923 if (real_name == nullptr) { 924 return nullptr; 925 } 926 JVMFlag* flag = JVMFlag::find_flag(real_name); 927 return flag; 928 } 929 930 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 931 bool is_bool = false; 932 bool bool_val = false; 933 char c = *arg; 934 if (c == '+' || c == '-') { 935 is_bool = true; 936 bool_val = (c == '+'); 937 arg++; 938 } 939 940 const char* name = arg; 941 while (true) { 942 c = *arg; 943 if (isalnum(c) || (c == '_')) { 944 ++arg; 945 } else { 946 break; 947 } 948 } 949 950 size_t name_len = size_t(arg - name); 951 if (name_len == 0) { 952 return false; 953 } 954 955 JVMFlag* flag = find_jvm_flag(name, name_len); 956 if (flag == nullptr) { 957 return false; 958 } 959 960 if (is_bool) { 961 if (*arg != 0) { 962 // Error -- extra characters such as -XX:+BoolFlag=123 963 return false; 964 } 965 return set_bool_flag(flag, bool_val, origin); 966 } 967 968 if (arg[0] == '=') { 969 const char* value = arg + 1; 970 if (flag->is_ccstr()) { 971 if (flag->ccstr_accumulates()) { 972 return append_to_string_flag(flag, value, origin); 973 } else { 974 return set_string_flag(flag, value, origin); 975 } 976 } else if (flag->is_double()) { 977 return set_fp_numeric_flag(flag, value, origin); 978 } else { 979 return set_numeric_flag(flag, value, origin); 980 } 981 } 982 983 if (arg[0] == ':' && arg[1] == '=') { 984 // -XX:Foo:=xxx will reset the string flag to the given value. 985 const char* value = arg + 2; 986 return set_string_flag(flag, value, origin); 987 } 988 989 return false; 990 } 991 992 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 993 assert(bldarray != nullptr, "illegal argument"); 994 995 if (arg == nullptr) { 996 return; 997 } 998 999 int new_count = *count + 1; 1000 1001 // expand the array and add arg to the last element 1002 if (*bldarray == nullptr) { 1003 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1004 } else { 1005 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1006 } 1007 (*bldarray)[*count] = os::strdup_check_oom(arg); 1008 *count = new_count; 1009 } 1010 1011 void Arguments::build_jvm_args(const char* arg) { 1012 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1013 } 1014 1015 void Arguments::build_jvm_flags(const char* arg) { 1016 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1017 } 1018 1019 // utility function to return a string that concatenates all 1020 // strings in a given char** array 1021 const char* Arguments::build_resource_string(char** args, int count) { 1022 if (args == nullptr || count == 0) { 1023 return nullptr; 1024 } 1025 size_t length = 0; 1026 for (int i = 0; i < count; i++) { 1027 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character 1028 } 1029 char* s = NEW_RESOURCE_ARRAY(char, length); 1030 char* dst = s; 1031 for (int j = 0; j < count; j++) { 1032 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character 1033 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character 1034 dst += offset; 1035 length -= offset; 1036 } 1037 return (const char*) s; 1038 } 1039 1040 void Arguments::print_on(outputStream* st) { 1041 st->print_cr("VM Arguments:"); 1042 if (num_jvm_flags() > 0) { 1043 st->print("jvm_flags: "); print_jvm_flags_on(st); 1044 st->cr(); 1045 } 1046 if (num_jvm_args() > 0) { 1047 st->print("jvm_args: "); print_jvm_args_on(st); 1048 st->cr(); 1049 } 1050 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1051 if (_java_class_path != nullptr) { 1052 char* path = _java_class_path->value(); 1053 size_t len = strlen(path); 1054 st->print("java_class_path (initial): "); 1055 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1056 if (len == 0) { 1057 st->print_raw_cr("<not set>"); 1058 } else { 1059 st->print_raw_cr(path, len); 1060 } 1061 } 1062 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1063 } 1064 1065 void Arguments::print_summary_on(outputStream* st) { 1066 // Print the command line. Environment variables that are helpful for 1067 // reproducing the problem are written later in the hs_err file. 1068 // flags are from setting file 1069 if (num_jvm_flags() > 0) { 1070 st->print_raw("Settings File: "); 1071 print_jvm_flags_on(st); 1072 st->cr(); 1073 } 1074 // args are the command line and environment variable arguments. 1075 st->print_raw("Command Line: "); 1076 if (num_jvm_args() > 0) { 1077 print_jvm_args_on(st); 1078 } 1079 // this is the classfile and any arguments to the java program 1080 if (java_command() != nullptr) { 1081 st->print("%s", java_command()); 1082 } 1083 st->cr(); 1084 } 1085 1086 void Arguments::print_jvm_flags_on(outputStream* st) { 1087 if (_num_jvm_flags > 0) { 1088 for (int i=0; i < _num_jvm_flags; i++) { 1089 st->print("%s ", _jvm_flags_array[i]); 1090 } 1091 } 1092 } 1093 1094 void Arguments::print_jvm_args_on(outputStream* st) { 1095 if (_num_jvm_args > 0) { 1096 for (int i=0; i < _num_jvm_args; i++) { 1097 st->print("%s ", _jvm_args_array[i]); 1098 } 1099 } 1100 } 1101 1102 bool Arguments::process_argument(const char* arg, 1103 jboolean ignore_unrecognized, 1104 JVMFlagOrigin origin) { 1105 JDK_Version since = JDK_Version(); 1106 1107 if (parse_argument(arg, origin)) { 1108 return true; 1109 } 1110 1111 // Determine if the flag has '+', '-', or '=' characters. 1112 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1113 const char* const argname = has_plus_minus ? arg + 1 : arg; 1114 1115 size_t arg_len; 1116 const char* equal_sign = strchr(argname, '='); 1117 if (equal_sign == nullptr) { 1118 arg_len = strlen(argname); 1119 } else { 1120 arg_len = equal_sign - argname; 1121 } 1122 1123 // Only make the obsolete check for valid arguments. 1124 if (arg_len <= BUFLEN) { 1125 // Construct a string which consists only of the argument name without '+', '-', or '='. 1126 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1127 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1128 if (is_obsolete_flag(stripped_argname, &since)) { 1129 char version[256]; 1130 since.to_string(version, sizeof(version)); 1131 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1132 return true; 1133 } 1134 } 1135 1136 // For locked flags, report a custom error message if available. 1137 // Otherwise, report the standard unrecognized VM option. 1138 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1139 if (found_flag != nullptr) { 1140 char locked_message_buf[BUFLEN]; 1141 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1142 if (strlen(locked_message_buf) != 0) { 1143 #ifdef PRODUCT 1144 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD; 1145 if (ignore_unrecognized && mismatched) { 1146 return true; 1147 } 1148 #endif 1149 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1150 } 1151 if (found_flag->is_bool() && !has_plus_minus) { 1152 jio_fprintf(defaultStream::error_stream(), 1153 "Missing +/- setting for VM option '%s'\n", argname); 1154 } else if (!found_flag->is_bool() && has_plus_minus) { 1155 jio_fprintf(defaultStream::error_stream(), 1156 "Unexpected +/- setting in VM option '%s'\n", argname); 1157 } else { 1158 jio_fprintf(defaultStream::error_stream(), 1159 "Improperly specified VM option '%s'\n", argname); 1160 } 1161 } else { 1162 if (ignore_unrecognized) { 1163 return true; 1164 } 1165 jio_fprintf(defaultStream::error_stream(), 1166 "Unrecognized VM option '%s'\n", argname); 1167 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1168 if (fuzzy_matched != nullptr) { 1169 jio_fprintf(defaultStream::error_stream(), 1170 "Did you mean '%s%s%s'?\n", 1171 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1172 fuzzy_matched->name(), 1173 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1174 } 1175 } 1176 1177 // allow for commandline "commenting out" options like -XX:#+Verbose 1178 return arg[0] == '#'; 1179 } 1180 1181 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1182 FILE* stream = os::fopen(file_name, "rb"); 1183 if (stream == nullptr) { 1184 if (should_exist) { 1185 jio_fprintf(defaultStream::error_stream(), 1186 "Could not open settings file %s\n", file_name); 1187 return false; 1188 } else { 1189 return true; 1190 } 1191 } 1192 1193 char token[1024]; 1194 int pos = 0; 1195 1196 bool in_white_space = true; 1197 bool in_comment = false; 1198 bool in_quote = false; 1199 int quote_c = 0; 1200 bool result = true; 1201 1202 int c = getc(stream); 1203 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1204 if (in_white_space) { 1205 if (in_comment) { 1206 if (c == '\n') in_comment = false; 1207 } else { 1208 if (c == '#') in_comment = true; 1209 else if (!isspace(c)) { 1210 in_white_space = false; 1211 token[pos++] = checked_cast<char>(c); 1212 } 1213 } 1214 } else { 1215 if (c == '\n' || (!in_quote && isspace(c))) { 1216 // token ends at newline, or at unquoted whitespace 1217 // this allows a way to include spaces in string-valued options 1218 token[pos] = '\0'; 1219 logOption(token); 1220 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1221 build_jvm_flags(token); 1222 pos = 0; 1223 in_white_space = true; 1224 in_quote = false; 1225 } else if (!in_quote && (c == '\'' || c == '"')) { 1226 in_quote = true; 1227 quote_c = c; 1228 } else if (in_quote && (c == quote_c)) { 1229 in_quote = false; 1230 } else { 1231 token[pos++] = checked_cast<char>(c); 1232 } 1233 } 1234 c = getc(stream); 1235 } 1236 if (pos > 0) { 1237 token[pos] = '\0'; 1238 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1239 build_jvm_flags(token); 1240 } 1241 fclose(stream); 1242 return result; 1243 } 1244 1245 //============================================================================================================= 1246 // Parsing of properties (-D) 1247 1248 const char* Arguments::get_property(const char* key) { 1249 return PropertyList_get_value(system_properties(), key); 1250 } 1251 1252 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1253 const char* eq = strchr(prop, '='); 1254 const char* key; 1255 const char* value = ""; 1256 1257 if (eq == nullptr) { 1258 // property doesn't have a value, thus use passed string 1259 key = prop; 1260 } else { 1261 // property have a value, thus extract it and save to the 1262 // allocated string 1263 size_t key_len = eq - prop; 1264 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1265 1266 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1267 key = tmp_key; 1268 1269 value = &prop[key_len + 1]; 1270 } 1271 1272 if (internal == ExternalProperty) { 1273 CDSConfig::check_incompatible_property(key, value); 1274 } 1275 1276 if (strcmp(key, "java.compiler") == 0) { 1277 // we no longer support java.compiler system property, log a warning and let it get 1278 // passed to Java, like any other system property 1279 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) { 1280 // for applications using NONE or empty value, log a more informative message 1281 warning("The java.compiler system property is obsolete and no longer supported, use -Xint"); 1282 } else { 1283 warning("The java.compiler system property is obsolete and no longer supported."); 1284 } 1285 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1286 // sun.java.launcher.is_altjvm property is 1287 // private and is processed in process_sun_java_launcher_properties(); 1288 // the sun.java.launcher property is passed on to the java application 1289 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1290 // append is true, writable is true, internal is false 1291 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1292 WriteableProperty, ExternalProperty); 1293 } else { 1294 if (strcmp(key, "sun.java.command") == 0) { 1295 char *old_java_command = _java_command; 1296 _java_command = os::strdup_check_oom(value, mtArguments); 1297 if (old_java_command != nullptr) { 1298 os::free(old_java_command); 1299 } 1300 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1301 // If this property is set on the command line then its value will be 1302 // displayed in VM error logs as the URL at which to submit such logs. 1303 // Normally the URL displayed in error logs is different from the value 1304 // of this system property, so a different property should have been 1305 // used here, but we leave this as-is in case someone depends upon it. 1306 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1307 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1308 // its value without going through the property list or making a Java call. 1309 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1310 if (old_java_vendor_url_bug != nullptr) { 1311 os::free((void *)old_java_vendor_url_bug); 1312 } 1313 } 1314 1315 // Create new property and add at the end of the list 1316 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1317 } 1318 1319 if (key != prop) { 1320 // SystemProperty copy passed value, thus free previously allocated 1321 // memory 1322 FreeHeap((void *)key); 1323 } 1324 1325 return true; 1326 } 1327 1328 //=========================================================================================================== 1329 // Setting int/mixed/comp mode flags 1330 1331 void Arguments::set_mode_flags(Mode mode) { 1332 // Set up default values for all flags. 1333 // If you add a flag to any of the branches below, 1334 // add a default value for it here. 1335 _mode = mode; 1336 1337 // Ensure Agent_OnLoad has the correct initial values. 1338 // This may not be the final mode; mode may change later in onload phase. 1339 PropertyList_unique_add(&_system_properties, "java.vm.info", 1340 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1341 1342 UseInterpreter = true; 1343 UseCompiler = true; 1344 UseLoopCounter = true; 1345 1346 // Default values may be platform/compiler dependent - 1347 // use the saved values 1348 ClipInlining = Arguments::_ClipInlining; 1349 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1350 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1351 BackgroundCompilation = Arguments::_BackgroundCompilation; 1352 1353 // Change from defaults based on mode 1354 switch (mode) { 1355 default: 1356 ShouldNotReachHere(); 1357 break; 1358 case _int: 1359 UseCompiler = false; 1360 UseLoopCounter = false; 1361 AlwaysCompileLoopMethods = false; 1362 UseOnStackReplacement = false; 1363 break; 1364 case _mixed: 1365 // same as default 1366 break; 1367 case _comp: 1368 UseInterpreter = false; 1369 BackgroundCompilation = false; 1370 ClipInlining = false; 1371 break; 1372 } 1373 } 1374 1375 // Conflict: required to use shared spaces (-Xshare:on), but 1376 // incompatible command line options were chosen. 1377 void Arguments::no_shared_spaces(const char* message) { 1378 if (RequireSharedSpaces) { 1379 jio_fprintf(defaultStream::error_stream(), 1380 "Class data sharing is inconsistent with other specified options.\n"); 1381 vm_exit_during_initialization("Unable to use shared archive", message); 1382 } else { 1383 log_info(cds)("Unable to use shared archive: %s", message); 1384 UseSharedSpaces = false; 1385 } 1386 } 1387 1388 static void set_object_alignment() { 1389 // Object alignment. 1390 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1391 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1392 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1393 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1394 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1395 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1396 1397 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1398 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1399 1400 // Oop encoding heap max 1401 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1402 } 1403 1404 size_t Arguments::max_heap_for_compressed_oops() { 1405 // Avoid sign flip. 1406 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1407 // We need to fit both the null page and the heap into the memory budget, while 1408 // keeping alignment constraints of the heap. To guarantee the latter, as the 1409 // null page is located before the heap, we pad the null page to the conservative 1410 // maximum alignment that the GC may ever impose upon the heap. 1411 size_t displacement_due_to_null_page = align_up(os::vm_page_size(), 1412 _conservative_max_heap_alignment); 1413 1414 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1415 NOT_LP64(ShouldNotReachHere(); return 0); 1416 } 1417 1418 void Arguments::set_use_compressed_oops() { 1419 #ifdef _LP64 1420 // MaxHeapSize is not set up properly at this point, but 1421 // the only value that can override MaxHeapSize if we are 1422 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1423 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1424 1425 if (max_heap_size <= max_heap_for_compressed_oops()) { 1426 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1427 FLAG_SET_ERGO(UseCompressedOops, true); 1428 } 1429 } else { 1430 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1431 warning("Max heap size too large for Compressed Oops"); 1432 FLAG_SET_DEFAULT(UseCompressedOops, false); 1433 } 1434 } 1435 #endif // _LP64 1436 } 1437 1438 void Arguments::set_use_compressed_klass_ptrs() { 1439 #ifdef _LP64 1440 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax, 1441 "CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1442 #endif // _LP64 1443 } 1444 1445 void Arguments::set_conservative_max_heap_alignment() { 1446 // The conservative maximum required alignment for the heap is the maximum of 1447 // the alignments imposed by several sources: any requirements from the heap 1448 // itself and the maximum page size we may run the VM with. 1449 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1450 _conservative_max_heap_alignment = MAX4(heap_alignment, 1451 os::vm_allocation_granularity(), 1452 os::max_page_size(), 1453 GCArguments::compute_heap_alignment()); 1454 } 1455 1456 jint Arguments::set_ergonomics_flags() { 1457 GCConfig::initialize(); 1458 1459 set_conservative_max_heap_alignment(); 1460 1461 #ifdef _LP64 1462 set_use_compressed_oops(); 1463 set_use_compressed_klass_ptrs(); 1464 1465 // Also checks that certain machines are slower with compressed oops 1466 // in vm_version initialization code. 1467 #endif // _LP64 1468 1469 return JNI_OK; 1470 } 1471 1472 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1473 size_t max_allocatable; 1474 size_t result = limit; 1475 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1476 // The AggressiveHeap check is a temporary workaround to avoid calling 1477 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1478 // selected. This works because AggressiveHeap implies UseParallelGC 1479 // where we know the ratio will be 1. Once the AggressiveHeap option is 1480 // removed, this can be cleaned up. 1481 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1482 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1483 result = MIN2(result, max_allocatable / fraction); 1484 } 1485 return result; 1486 } 1487 1488 // Use static initialization to get the default before parsing 1489 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1490 1491 void Arguments::set_heap_size() { 1492 julong phys_mem; 1493 1494 // If the user specified one of these options, they 1495 // want specific memory sizing so do not limit memory 1496 // based on compressed oops addressability. 1497 // Also, memory limits will be calculated based on 1498 // available os physical memory, not our MaxRAM limit, 1499 // unless MaxRAM is also specified. 1500 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1501 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1502 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1503 !FLAG_IS_DEFAULT(MaxRAM)); 1504 if (override_coop_limit) { 1505 if (FLAG_IS_DEFAULT(MaxRAM)) { 1506 phys_mem = os::physical_memory(); 1507 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1508 } else { 1509 phys_mem = (julong)MaxRAM; 1510 } 1511 } else { 1512 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1513 : (julong)MaxRAM; 1514 } 1515 1516 // If the maximum heap size has not been set with -Xmx, 1517 // then set it as fraction of the size of physical memory, 1518 // respecting the maximum and minimum sizes of the heap. 1519 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1520 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100); 1521 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100); 1522 if (reasonable_min < MaxHeapSize) { 1523 // Small physical memory, so use a minimum fraction of it for the heap 1524 reasonable_max = reasonable_min; 1525 } else { 1526 // Not-small physical memory, so require a heap at least 1527 // as large as MaxHeapSize 1528 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1529 } 1530 1531 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1532 // Limit the heap size to ErgoHeapSizeLimit 1533 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1534 } 1535 1536 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1537 1538 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1539 // An initial heap size was specified on the command line, 1540 // so be sure that the maximum size is consistent. Done 1541 // after call to limit_heap_by_allocatable_memory because that 1542 // method might reduce the allocation size. 1543 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1544 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1545 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1546 } 1547 1548 #ifdef _LP64 1549 if (UseCompressedOops || UseCompressedClassPointers) { 1550 // HeapBaseMinAddress can be greater than default but not less than. 1551 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1552 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1553 // matches compressed oops printing flags 1554 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1555 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1556 DefaultHeapBaseMinAddress, 1557 DefaultHeapBaseMinAddress/G, 1558 HeapBaseMinAddress); 1559 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1560 } 1561 } 1562 } 1563 if (UseCompressedOops) { 1564 // Limit the heap size to the maximum possible when using compressed oops 1565 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1566 1567 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1568 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1569 // but it should be not less than default MaxHeapSize. 1570 max_coop_heap -= HeapBaseMinAddress; 1571 } 1572 1573 // If user specified flags prioritizing os physical 1574 // memory limits, then disable compressed oops if 1575 // limits exceed max_coop_heap and UseCompressedOops 1576 // was not specified. 1577 if (reasonable_max > max_coop_heap) { 1578 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1579 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1580 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1581 "Please check the setting of MaxRAMPercentage %5.2f." 1582 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1583 FLAG_SET_ERGO(UseCompressedOops, false); 1584 } else { 1585 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1586 } 1587 } 1588 } 1589 #endif // _LP64 1590 1591 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1592 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1593 } 1594 1595 // If the minimum or initial heap_size have not been set or requested to be set 1596 // ergonomically, set them accordingly. 1597 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1598 julong reasonable_minimum = (julong)(OldSize + NewSize); 1599 1600 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1601 1602 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1603 1604 if (InitialHeapSize == 0) { 1605 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100); 1606 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1607 1608 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1609 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1610 1611 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1612 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1613 } 1614 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1615 // synchronize with InitialHeapSize to avoid errors with the default value. 1616 if (MinHeapSize == 0) { 1617 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1618 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1619 } 1620 } 1621 } 1622 1623 // This option inspects the machine and attempts to set various 1624 // parameters to be optimal for long-running, memory allocation 1625 // intensive jobs. It is intended for machines with large 1626 // amounts of cpu and memory. 1627 jint Arguments::set_aggressive_heap_flags() { 1628 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1629 // VM, but we may not be able to represent the total physical memory 1630 // available (like having 8gb of memory on a box but using a 32bit VM). 1631 // Thus, we need to make sure we're using a julong for intermediate 1632 // calculations. 1633 julong initHeapSize; 1634 julong total_memory = os::physical_memory(); 1635 1636 if (total_memory < (julong) 256 * M) { 1637 jio_fprintf(defaultStream::error_stream(), 1638 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1639 vm_exit(1); 1640 } 1641 1642 // The heap size is half of available memory, or (at most) 1643 // all of possible memory less 160mb (leaving room for the OS 1644 // when using ISM). This is the maximum; because adaptive sizing 1645 // is turned on below, the actual space used may be smaller. 1646 1647 initHeapSize = MIN2(total_memory / (julong) 2, 1648 total_memory - (julong) 160 * M); 1649 1650 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1651 1652 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1653 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1654 return JNI_EINVAL; 1655 } 1656 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1657 return JNI_EINVAL; 1658 } 1659 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1660 return JNI_EINVAL; 1661 } 1662 } 1663 if (FLAG_IS_DEFAULT(NewSize)) { 1664 // Make the young generation 3/8ths of the total heap. 1665 if (FLAG_SET_CMDLINE(NewSize, 1666 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1667 return JNI_EINVAL; 1668 } 1669 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1670 return JNI_EINVAL; 1671 } 1672 } 1673 1674 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1675 FLAG_SET_DEFAULT(UseLargePages, true); 1676 #endif 1677 1678 // Increase some data structure sizes for efficiency 1679 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1680 return JNI_EINVAL; 1681 } 1682 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1683 return JNI_EINVAL; 1684 } 1685 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1686 return JNI_EINVAL; 1687 } 1688 1689 // See the OldPLABSize comment below, but replace 'after promotion' 1690 // with 'after copying'. YoungPLABSize is the size of the survivor 1691 // space per-gc-thread buffers. The default is 4kw. 1692 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1693 return JNI_EINVAL; 1694 } 1695 1696 // OldPLABSize is the size of the buffers in the old gen that 1697 // UseParallelGC uses to promote live data that doesn't fit in the 1698 // survivor spaces. At any given time, there's one for each gc thread. 1699 // The default size is 1kw. These buffers are rarely used, since the 1700 // survivor spaces are usually big enough. For specjbb, however, there 1701 // are occasions when there's lots of live data in the young gen 1702 // and we end up promoting some of it. We don't have a definite 1703 // explanation for why bumping OldPLABSize helps, but the theory 1704 // is that a bigger PLAB results in retaining something like the 1705 // original allocation order after promotion, which improves mutator 1706 // locality. A minor effect may be that larger PLABs reduce the 1707 // number of PLAB allocation events during gc. The value of 8kw 1708 // was arrived at by experimenting with specjbb. 1709 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1710 return JNI_EINVAL; 1711 } 1712 1713 // Enable parallel GC and adaptive generation sizing 1714 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1715 return JNI_EINVAL; 1716 } 1717 1718 // Encourage steady state memory management 1719 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1720 return JNI_EINVAL; 1721 } 1722 1723 return JNI_OK; 1724 } 1725 1726 // This must be called after ergonomics. 1727 void Arguments::set_bytecode_flags() { 1728 if (!RewriteBytecodes) { 1729 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1730 } 1731 } 1732 1733 // Aggressive optimization flags 1734 jint Arguments::set_aggressive_opts_flags() { 1735 #ifdef COMPILER2 1736 if (AggressiveUnboxing) { 1737 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1738 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1739 } else if (!EliminateAutoBox) { 1740 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1741 AggressiveUnboxing = false; 1742 } 1743 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1744 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1745 } else if (!DoEscapeAnalysis) { 1746 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1747 AggressiveUnboxing = false; 1748 } 1749 } 1750 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1751 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1752 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1753 } 1754 // Feed the cache size setting into the JDK 1755 char buffer[1024]; 1756 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1757 if (!add_property(buffer)) { 1758 return JNI_ENOMEM; 1759 } 1760 } 1761 #endif 1762 1763 return JNI_OK; 1764 } 1765 1766 //=========================================================================================================== 1767 1768 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1769 if (_sun_java_launcher != _default_java_launcher) { 1770 os::free(const_cast<char*>(_sun_java_launcher)); 1771 } 1772 _sun_java_launcher = os::strdup_check_oom(launcher); 1773 } 1774 1775 bool Arguments::created_by_java_launcher() { 1776 assert(_sun_java_launcher != nullptr, "property must have value"); 1777 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1778 } 1779 1780 bool Arguments::sun_java_launcher_is_altjvm() { 1781 return _sun_java_launcher_is_altjvm; 1782 } 1783 1784 //=========================================================================================================== 1785 // Parsing of main arguments 1786 1787 unsigned int addreads_count = 0; 1788 unsigned int addexports_count = 0; 1789 unsigned int addopens_count = 0; 1790 unsigned int addmods_count = 0; 1791 unsigned int enable_native_access_count = 0; 1792 1793 // Check the consistency of vm_init_args 1794 bool Arguments::check_vm_args_consistency() { 1795 // Method for adding checks for flag consistency. 1796 // The intent is to warn the user of all possible conflicts, 1797 // before returning an error. 1798 // Note: Needs platform-dependent factoring. 1799 bool status = true; 1800 1801 if (TLABRefillWasteFraction == 0) { 1802 jio_fprintf(defaultStream::error_stream(), 1803 "TLABRefillWasteFraction should be a denominator, " 1804 "not " SIZE_FORMAT "\n", 1805 TLABRefillWasteFraction); 1806 status = false; 1807 } 1808 1809 status = CompilerConfig::check_args_consistency(status); 1810 #if INCLUDE_JVMCI 1811 if (status && EnableJVMCI) { 1812 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 1813 AddProperty, UnwriteableProperty, InternalProperty); 1814 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) { 1815 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 1816 return false; 1817 } 1818 } 1819 } 1820 #endif 1821 1822 #if INCLUDE_JFR 1823 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1824 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) { 1825 return false; 1826 } 1827 } 1828 #endif 1829 1830 #ifndef SUPPORT_RESERVED_STACK_AREA 1831 if (StackReservedPages != 0) { 1832 FLAG_SET_CMDLINE(StackReservedPages, 0); 1833 warning("Reserved Stack Area not supported on this platform"); 1834 } 1835 #endif 1836 1837 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypePassFieldsAsArgs)) { 1838 FLAG_SET_CMDLINE(InlineTypePassFieldsAsArgs, false); 1839 warning("InlineTypePassFieldsAsArgs is not supported on this platform"); 1840 } 1841 1842 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypeReturnedAsFields)) { 1843 FLAG_SET_CMDLINE(InlineTypeReturnedAsFields, false); 1844 warning("InlineTypeReturnedAsFields is not supported on this platform"); 1845 } 1846 1847 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390) 1848 if (LockingMode == LM_LIGHTWEIGHT) { 1849 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY); 1850 warning("New lightweight locking not supported on this platform"); 1851 } 1852 #endif 1853 1854 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390) 1855 if (LockingMode == LM_MONITOR) { 1856 jio_fprintf(defaultStream::error_stream(), 1857 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n"); 1858 return false; 1859 } 1860 #endif 1861 #if defined(X86) && !defined(ZERO) 1862 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) { 1863 jio_fprintf(defaultStream::error_stream(), 1864 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n"); 1865 1866 return false; 1867 } 1868 #endif 1869 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) { 1870 jio_fprintf(defaultStream::error_stream(), 1871 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n"); 1872 return false; 1873 } 1874 return status; 1875 } 1876 1877 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1878 const char* option_type) { 1879 if (ignore) return false; 1880 1881 const char* spacer = " "; 1882 if (option_type == nullptr) { 1883 option_type = ++spacer; // Set both to the empty string. 1884 } 1885 1886 jio_fprintf(defaultStream::error_stream(), 1887 "Unrecognized %s%soption: %s\n", option_type, spacer, 1888 option->optionString); 1889 return true; 1890 } 1891 1892 static const char* user_assertion_options[] = { 1893 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1894 }; 1895 1896 static const char* system_assertion_options[] = { 1897 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1898 }; 1899 1900 bool Arguments::parse_uint(const char* value, 1901 uint* uint_arg, 1902 uint min_size) { 1903 uint n; 1904 if (!parse_integer(value, &n)) { 1905 return false; 1906 } 1907 if (n >= min_size) { 1908 *uint_arg = n; 1909 return true; 1910 } else { 1911 return false; 1912 } 1913 } 1914 1915 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 1916 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 1917 CDSConfig::check_internal_module_property(prop_name, prop_value); 1918 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 1919 char* property = AllocateHeap(prop_len, mtArguments); 1920 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 1921 if (ret < 0 || ret >= (int)prop_len) { 1922 FreeHeap(property); 1923 return false; 1924 } 1925 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 1926 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 1927 // that multiple occurrences of the associated flag just causes the existing property value to be 1928 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 1929 // to a property after we have finished flag processing. 1930 bool added = add_property(property, WriteableProperty, internal); 1931 FreeHeap(property); 1932 return added; 1933 } 1934 1935 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 1936 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 1937 CDSConfig::check_internal_module_property(prop_base_name, prop_value); 1938 const unsigned int props_count_limit = 1000; 1939 const int max_digits = 3; 1940 const int extra_symbols_count = 3; // includes '.', '=', '\0' 1941 1942 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 1943 if (count < props_count_limit) { 1944 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 1945 char* property = AllocateHeap(prop_len, mtArguments); 1946 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 1947 if (ret < 0 || ret >= (int)prop_len) { 1948 FreeHeap(property); 1949 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 1950 return false; 1951 } 1952 bool added = add_property(property, UnwriteableProperty, InternalProperty); 1953 FreeHeap(property); 1954 return added; 1955 } 1956 1957 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 1958 return false; 1959 } 1960 1961 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1962 julong* long_arg, 1963 julong min_size, 1964 julong max_size) { 1965 if (!parse_integer(s, long_arg)) return arg_unreadable; 1966 return check_memory_size(*long_arg, min_size, max_size); 1967 } 1968 1969 // Parse JavaVMInitArgs structure 1970 1971 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 1972 const JavaVMInitArgs *java_tool_options_args, 1973 const JavaVMInitArgs *java_options_args, 1974 const JavaVMInitArgs *cmd_line_args) { 1975 // Save default settings for some mode flags 1976 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1977 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1978 Arguments::_ClipInlining = ClipInlining; 1979 Arguments::_BackgroundCompilation = BackgroundCompilation; 1980 1981 // Remember the default value of SharedBaseAddress. 1982 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 1983 1984 // Setup flags for mixed which is the default 1985 set_mode_flags(_mixed); 1986 1987 // Parse args structure generated from java.base vm options resource 1988 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE); 1989 if (result != JNI_OK) { 1990 return result; 1991 } 1992 1993 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 1994 // variable (if present). 1995 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR); 1996 if (result != JNI_OK) { 1997 return result; 1998 } 1999 2000 // Parse args structure generated from the command line flags. 2001 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE); 2002 if (result != JNI_OK) { 2003 return result; 2004 } 2005 2006 // Parse args structure generated from the _JAVA_OPTIONS environment 2007 // variable (if present) (mimics classic VM) 2008 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR); 2009 if (result != JNI_OK) { 2010 return result; 2011 } 2012 2013 // Disable CDS for exploded image 2014 if (!has_jimage()) { 2015 no_shared_spaces("CDS disabled on exploded JDK"); 2016 } 2017 2018 // We need to ensure processor and memory resources have been properly 2019 // configured - which may rely on arguments we just processed - before 2020 // doing the final argument processing. Any argument processing that 2021 // needs to know about processor and memory resources must occur after 2022 // this point. 2023 2024 os::init_container_support(); 2025 2026 SystemMemoryBarrier::initialize(); 2027 2028 // Do final processing now that all arguments have been parsed 2029 result = finalize_vm_init_args(); 2030 if (result != JNI_OK) { 2031 return result; 2032 } 2033 2034 return JNI_OK; 2035 } 2036 2037 #if !INCLUDE_JVMTI 2038 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2039 // represents a valid JDWP agent. is_path==true denotes that we 2040 // are dealing with -agentpath (case where name is a path), otherwise with 2041 // -agentlib 2042 static bool valid_jdwp_agent(char *name, bool is_path) { 2043 char *_name; 2044 const char *_jdwp = "jdwp"; 2045 size_t _len_jdwp, _len_prefix; 2046 2047 if (is_path) { 2048 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) { 2049 return false; 2050 } 2051 2052 _name++; // skip past last path separator 2053 _len_prefix = strlen(JNI_LIB_PREFIX); 2054 2055 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2056 return false; 2057 } 2058 2059 _name += _len_prefix; 2060 _len_jdwp = strlen(_jdwp); 2061 2062 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2063 _name += _len_jdwp; 2064 } 2065 else { 2066 return false; 2067 } 2068 2069 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2070 return false; 2071 } 2072 2073 return true; 2074 } 2075 2076 if (strcmp(name, _jdwp) == 0) { 2077 return true; 2078 } 2079 2080 return false; 2081 } 2082 #endif 2083 2084 int Arguments::process_patch_mod_option(const char* patch_mod_tail) { 2085 // --patch-module=<module>=<file>(<pathsep><file>)* 2086 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value"); 2087 // Find the equal sign between the module name and the path specification 2088 const char* module_equal = strchr(patch_mod_tail, '='); 2089 if (module_equal == nullptr) { 2090 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2091 return JNI_ERR; 2092 } else { 2093 // Pick out the module name 2094 size_t module_len = module_equal - patch_mod_tail; 2095 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2096 if (module_name != nullptr) { 2097 memcpy(module_name, patch_mod_tail, module_len); 2098 *(module_name + module_len) = '\0'; 2099 // The path piece begins one past the module_equal sign 2100 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */); 2101 FREE_C_HEAP_ARRAY(char, module_name); 2102 } else { 2103 return JNI_ENOMEM; 2104 } 2105 } 2106 return JNI_OK; 2107 } 2108 2109 // VALUECLASS_STR must match string used in the build 2110 #define VALUECLASS_STR "valueclasses" 2111 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar" 2112 2113 // Finalize --patch-module args and --enable-preview related to value class module patches. 2114 // Create all numbered properties passing module patches. 2115 int Arguments::finalize_patch_module() { 2116 // If --enable-preview and EnableValhalla is true, each module may have value classes that 2117 // are to be patched into the module. 2118 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/ 2119 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar 2120 if (enable_preview() && EnableValhalla) { 2121 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2122 const char * fileSep = os::file_separator(); 2123 2124 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s", 2125 Arguments::get_java_home(), fileSep, fileSep, fileSep); 2126 DIR* dir = os::opendir(valueclasses_dir); 2127 if (dir != nullptr) { 2128 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2129 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2130 2131 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) { 2132 // Test if file ends-with "-valueclasses.jar" 2133 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1); 2134 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) { 2135 continue; // too short or not the expected suffix 2136 } 2137 2138 strcpy(module_name, entry->d_name); 2139 module_name[len] = '\0'; // truncate to just module-name 2140 2141 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name); 2142 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/); 2143 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name); 2144 } 2145 FreeHeap(module_name); 2146 FreeHeap(path); 2147 os::closedir(dir); 2148 } 2149 FreeHeap(valueclasses_dir); 2150 } 2151 2152 // Create numbered properties for each module that has been patched either 2153 // by --patch-module or --enable-preview 2154 // Format is "jdk.module.patch.<n>=<module_name>=<path>" 2155 if (_patch_mod_prefix != nullptr) { 2156 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments); 2157 unsigned int patch_mod_count = 0; 2158 2159 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin(); 2160 it != _patch_mod_prefix->end(); ++it) { 2161 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s", 2162 (*it)->module_name(), (*it)->path_string()); 2163 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) { 2164 FreeHeap(prop_value); 2165 return JNI_ENOMEM; 2166 } 2167 } 2168 FreeHeap(prop_value); 2169 } 2170 return JNI_OK; 2171 } 2172 2173 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2174 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2175 // The min and max sizes match the values in globals.hpp, but scaled 2176 // with K. The values have been chosen so that alignment with page 2177 // size doesn't change the max value, which makes the conversions 2178 // back and forth between Xss value and ThreadStackSize value easier. 2179 // The values have also been chosen to fit inside a 32-bit signed type. 2180 const julong min_ThreadStackSize = 0; 2181 const julong max_ThreadStackSize = 1 * M; 2182 2183 // Make sure the above values match the range set in globals.hpp 2184 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2185 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2186 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2187 2188 const julong min_size = min_ThreadStackSize * K; 2189 const julong max_size = max_ThreadStackSize * K; 2190 2191 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2192 2193 julong size = 0; 2194 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2195 if (errcode != arg_in_range) { 2196 bool silent = (option == nullptr); // Allow testing to silence error messages 2197 if (!silent) { 2198 jio_fprintf(defaultStream::error_stream(), 2199 "Invalid thread stack size: %s\n", option->optionString); 2200 describe_range_error(errcode); 2201 } 2202 return JNI_EINVAL; 2203 } 2204 2205 // Internally track ThreadStackSize in units of 1024 bytes. 2206 const julong size_aligned = align_up(size, K); 2207 assert(size <= size_aligned, 2208 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2209 size, size_aligned); 2210 2211 const julong size_in_K = size_aligned / K; 2212 assert(size_in_K < (julong)max_intx, 2213 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2214 size_in_K); 2215 2216 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2217 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2218 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2219 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2220 max_expanded, size_in_K); 2221 2222 *out_ThreadStackSize = (intx)size_in_K; 2223 2224 return JNI_OK; 2225 } 2226 2227 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) { 2228 // For match_option to return remaining or value part of option string 2229 const char* tail; 2230 2231 // iterate over arguments 2232 for (int index = 0; index < args->nOptions; index++) { 2233 bool is_absolute_path = false; // for -agentpath vs -agentlib 2234 2235 const JavaVMOption* option = args->options + index; 2236 2237 if (!match_option(option, "-Djava.class.path", &tail) && 2238 !match_option(option, "-Dsun.java.command", &tail) && 2239 !match_option(option, "-Dsun.java.launcher", &tail)) { 2240 2241 // add all jvm options to the jvm_args string. This string 2242 // is used later to set the java.vm.args PerfData string constant. 2243 // the -Djava.class.path and the -Dsun.java.command options are 2244 // omitted from jvm_args string as each have their own PerfData 2245 // string constant object. 2246 build_jvm_args(option->optionString); 2247 } 2248 2249 // -verbose:[class/module/gc/jni] 2250 if (match_option(option, "-verbose", &tail)) { 2251 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2252 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2253 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2254 } else if (!strcmp(tail, ":module")) { 2255 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2256 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2257 } else if (!strcmp(tail, ":gc")) { 2258 if (_legacyGCLogging.lastFlag == 0) { 2259 _legacyGCLogging.lastFlag = 1; 2260 } 2261 } else if (!strcmp(tail, ":jni")) { 2262 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2263 } 2264 // -da / -ea / -disableassertions / -enableassertions 2265 // These accept an optional class/package name separated by a colon, e.g., 2266 // -da:java.lang.Thread. 2267 } else if (match_option(option, user_assertion_options, &tail, true)) { 2268 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2269 if (*tail == '\0') { 2270 JavaAssertions::setUserClassDefault(enable); 2271 } else { 2272 assert(*tail == ':', "bogus match by match_option()"); 2273 JavaAssertions::addOption(tail + 1, enable); 2274 } 2275 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2276 } else if (match_option(option, system_assertion_options, &tail, false)) { 2277 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2278 JavaAssertions::setSystemClassDefault(enable); 2279 // -bootclasspath: 2280 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2281 jio_fprintf(defaultStream::output_stream(), 2282 "-Xbootclasspath is no longer a supported option.\n"); 2283 return JNI_EINVAL; 2284 // -bootclasspath/a: 2285 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2286 Arguments::append_sysclasspath(tail); 2287 // -bootclasspath/p: 2288 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2289 jio_fprintf(defaultStream::output_stream(), 2290 "-Xbootclasspath/p is no longer a supported option.\n"); 2291 return JNI_EINVAL; 2292 // -Xrun 2293 } else if (match_option(option, "-Xrun", &tail)) { 2294 if (tail != nullptr) { 2295 const char* pos = strchr(tail, ':'); 2296 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail; 2297 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2298 jio_snprintf(name, len + 1, "%s", tail); 2299 2300 char *options = nullptr; 2301 if(pos != nullptr) { 2302 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2303 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2304 } 2305 #if !INCLUDE_JVMTI 2306 if (strcmp(name, "jdwp") == 0) { 2307 jio_fprintf(defaultStream::error_stream(), 2308 "Debugging agents are not supported in this VM\n"); 2309 return JNI_ERR; 2310 } 2311 #endif // !INCLUDE_JVMTI 2312 JvmtiAgentList::add_xrun(name, options, false); 2313 FREE_C_HEAP_ARRAY(char, name); 2314 FREE_C_HEAP_ARRAY(char, options); 2315 } 2316 } else if (match_option(option, "--add-reads=", &tail)) { 2317 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2318 return JNI_ENOMEM; 2319 } 2320 } else if (match_option(option, "--add-exports=", &tail)) { 2321 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2322 return JNI_ENOMEM; 2323 } 2324 } else if (match_option(option, "--add-opens=", &tail)) { 2325 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2326 return JNI_ENOMEM; 2327 } 2328 } else if (match_option(option, "--add-modules=", &tail)) { 2329 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2330 return JNI_ENOMEM; 2331 } 2332 } else if (match_option(option, "--enable-native-access=", &tail)) { 2333 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2334 return JNI_ENOMEM; 2335 } 2336 } else if (match_option(option, "--limit-modules=", &tail)) { 2337 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2338 return JNI_ENOMEM; 2339 } 2340 } else if (match_option(option, "--module-path=", &tail)) { 2341 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2342 return JNI_ENOMEM; 2343 } 2344 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2345 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2346 return JNI_ENOMEM; 2347 } 2348 } else if (match_option(option, "--patch-module=", &tail)) { 2349 // --patch-module=<module>=<file>(<pathsep><file>)* 2350 int res = process_patch_mod_option(tail); 2351 if (res != JNI_OK) { 2352 return res; 2353 } 2354 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) { 2355 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) { 2356 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail, 2357 AddProperty, WriteableProperty, InternalProperty); 2358 } else { 2359 jio_fprintf(defaultStream::error_stream(), 2360 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail); 2361 return JNI_ERR; 2362 } 2363 } else if (match_option(option, "--illegal-access=", &tail)) { 2364 char version[256]; 2365 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2366 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2367 // -agentlib and -agentpath 2368 } else if (match_option(option, "-agentlib:", &tail) || 2369 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2370 if(tail != nullptr) { 2371 const char* pos = strchr(tail, '='); 2372 char* name; 2373 if (pos == nullptr) { 2374 name = os::strdup_check_oom(tail, mtArguments); 2375 } else { 2376 size_t len = pos - tail; 2377 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2378 memcpy(name, tail, len); 2379 name[len] = '\0'; 2380 } 2381 2382 char *options = nullptr; 2383 if(pos != nullptr) { 2384 options = os::strdup_check_oom(pos + 1, mtArguments); 2385 } 2386 #if !INCLUDE_JVMTI 2387 if (valid_jdwp_agent(name, is_absolute_path)) { 2388 jio_fprintf(defaultStream::error_stream(), 2389 "Debugging agents are not supported in this VM\n"); 2390 return JNI_ERR; 2391 } 2392 #endif // !INCLUDE_JVMTI 2393 JvmtiAgentList::add(name, options, is_absolute_path); 2394 os::free(name); 2395 os::free(options); 2396 } 2397 // -javaagent 2398 } else if (match_option(option, "-javaagent:", &tail)) { 2399 #if !INCLUDE_JVMTI 2400 jio_fprintf(defaultStream::error_stream(), 2401 "Instrumentation agents are not supported in this VM\n"); 2402 return JNI_ERR; 2403 #else 2404 if (tail != nullptr) { 2405 size_t length = strlen(tail) + 1; 2406 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2407 jio_snprintf(options, length, "%s", tail); 2408 JvmtiAgentList::add("instrument", options, false); 2409 FREE_C_HEAP_ARRAY(char, options); 2410 2411 // java agents need module java.instrument 2412 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2413 return JNI_ENOMEM; 2414 } 2415 } 2416 #endif // !INCLUDE_JVMTI 2417 // --enable_preview 2418 } else if (match_option(option, "--enable-preview")) { 2419 set_enable_preview(); 2420 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration 2421 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) { 2422 return JNI_EINVAL; 2423 } 2424 // -Xnoclassgc 2425 } else if (match_option(option, "-Xnoclassgc")) { 2426 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2427 return JNI_EINVAL; 2428 } 2429 // -Xbatch 2430 } else if (match_option(option, "-Xbatch")) { 2431 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2432 return JNI_EINVAL; 2433 } 2434 // -Xmn for compatibility with other JVM vendors 2435 } else if (match_option(option, "-Xmn", &tail)) { 2436 julong long_initial_young_size = 0; 2437 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2438 if (errcode != arg_in_range) { 2439 jio_fprintf(defaultStream::error_stream(), 2440 "Invalid initial young generation size: %s\n", option->optionString); 2441 describe_range_error(errcode); 2442 return JNI_EINVAL; 2443 } 2444 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2445 return JNI_EINVAL; 2446 } 2447 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2448 return JNI_EINVAL; 2449 } 2450 // -Xms 2451 } else if (match_option(option, "-Xms", &tail)) { 2452 julong size = 0; 2453 // an initial heap size of 0 means automatically determine 2454 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2455 if (errcode != arg_in_range) { 2456 jio_fprintf(defaultStream::error_stream(), 2457 "Invalid initial heap size: %s\n", option->optionString); 2458 describe_range_error(errcode); 2459 return JNI_EINVAL; 2460 } 2461 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2462 return JNI_EINVAL; 2463 } 2464 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2465 return JNI_EINVAL; 2466 } 2467 // -Xmx 2468 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2469 julong long_max_heap_size = 0; 2470 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2471 if (errcode != arg_in_range) { 2472 jio_fprintf(defaultStream::error_stream(), 2473 "Invalid maximum heap size: %s\n", option->optionString); 2474 describe_range_error(errcode); 2475 return JNI_EINVAL; 2476 } 2477 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2478 return JNI_EINVAL; 2479 } 2480 // Xmaxf 2481 } else if (match_option(option, "-Xmaxf", &tail)) { 2482 char* err; 2483 int maxf = (int)(strtod(tail, &err) * 100); 2484 if (*err != '\0' || *tail == '\0') { 2485 jio_fprintf(defaultStream::error_stream(), 2486 "Bad max heap free percentage size: %s\n", 2487 option->optionString); 2488 return JNI_EINVAL; 2489 } else { 2490 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2491 return JNI_EINVAL; 2492 } 2493 } 2494 // Xminf 2495 } else if (match_option(option, "-Xminf", &tail)) { 2496 char* err; 2497 int minf = (int)(strtod(tail, &err) * 100); 2498 if (*err != '\0' || *tail == '\0') { 2499 jio_fprintf(defaultStream::error_stream(), 2500 "Bad min heap free percentage size: %s\n", 2501 option->optionString); 2502 return JNI_EINVAL; 2503 } else { 2504 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2505 return JNI_EINVAL; 2506 } 2507 } 2508 // -Xss 2509 } else if (match_option(option, "-Xss", &tail)) { 2510 intx value = 0; 2511 jint err = parse_xss(option, tail, &value); 2512 if (err != JNI_OK) { 2513 return err; 2514 } 2515 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2516 return JNI_EINVAL; 2517 } 2518 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2519 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2520 julong long_ReservedCodeCacheSize = 0; 2521 2522 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2523 if (errcode != arg_in_range) { 2524 jio_fprintf(defaultStream::error_stream(), 2525 "Invalid maximum code cache size: %s.\n", option->optionString); 2526 return JNI_EINVAL; 2527 } 2528 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2529 return JNI_EINVAL; 2530 } 2531 // -green 2532 } else if (match_option(option, "-green")) { 2533 jio_fprintf(defaultStream::error_stream(), 2534 "Green threads support not available\n"); 2535 return JNI_EINVAL; 2536 // -native 2537 } else if (match_option(option, "-native")) { 2538 // HotSpot always uses native threads, ignore silently for compatibility 2539 // -Xrs 2540 } else if (match_option(option, "-Xrs")) { 2541 // Classic/EVM option, new functionality 2542 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2543 return JNI_EINVAL; 2544 } 2545 // -Xprof 2546 } else if (match_option(option, "-Xprof")) { 2547 char version[256]; 2548 // Obsolete in JDK 10 2549 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2550 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2551 // -Xinternalversion 2552 } else if (match_option(option, "-Xinternalversion")) { 2553 jio_fprintf(defaultStream::output_stream(), "%s\n", 2554 VM_Version::internal_vm_info_string()); 2555 vm_exit(0); 2556 #ifndef PRODUCT 2557 // -Xprintflags 2558 } else if (match_option(option, "-Xprintflags")) { 2559 JVMFlag::printFlags(tty, false); 2560 vm_exit(0); 2561 #endif 2562 // -D 2563 } else if (match_option(option, "-D", &tail)) { 2564 const char* value; 2565 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2566 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2567 // abort if -Djava.endorsed.dirs is set 2568 jio_fprintf(defaultStream::output_stream(), 2569 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2570 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2571 return JNI_EINVAL; 2572 } 2573 if (match_option(option, "-Djava.ext.dirs=", &value) && 2574 *value != '\0' && strcmp(value, "\"\"") != 0) { 2575 // abort if -Djava.ext.dirs is set 2576 jio_fprintf(defaultStream::output_stream(), 2577 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2578 return JNI_EINVAL; 2579 } 2580 // Check for module related properties. They must be set using the modules 2581 // options. For example: use "--add-modules=java.sql", not 2582 // "-Djdk.module.addmods=java.sql" 2583 if (is_internal_module_property(option->optionString + 2)) { 2584 needs_module_property_warning = true; 2585 continue; 2586 } 2587 if (!add_property(tail)) { 2588 return JNI_ENOMEM; 2589 } 2590 // Out of the box management support 2591 if (match_option(option, "-Dcom.sun.management", &tail)) { 2592 #if INCLUDE_MANAGEMENT 2593 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2594 return JNI_EINVAL; 2595 } 2596 // management agent in module jdk.management.agent 2597 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2598 return JNI_ENOMEM; 2599 } 2600 #else 2601 jio_fprintf(defaultStream::output_stream(), 2602 "-Dcom.sun.management is not supported in this VM.\n"); 2603 return JNI_ERR; 2604 #endif 2605 } 2606 // -Xint 2607 } else if (match_option(option, "-Xint")) { 2608 set_mode_flags(_int); 2609 mode_flag_cmd_line = true; 2610 // -Xmixed 2611 } else if (match_option(option, "-Xmixed")) { 2612 set_mode_flags(_mixed); 2613 mode_flag_cmd_line = true; 2614 // -Xcomp 2615 } else if (match_option(option, "-Xcomp")) { 2616 // for testing the compiler; turn off all flags that inhibit compilation 2617 set_mode_flags(_comp); 2618 mode_flag_cmd_line = true; 2619 // -Xshare:dump 2620 } else if (match_option(option, "-Xshare:dump")) { 2621 CDSConfig::enable_dumping_static_archive(); 2622 // -Xshare:on 2623 } else if (match_option(option, "-Xshare:on")) { 2624 UseSharedSpaces = true; 2625 RequireSharedSpaces = true; 2626 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2627 } else if (match_option(option, "-Xshare:auto")) { 2628 UseSharedSpaces = true; 2629 RequireSharedSpaces = false; 2630 xshare_auto_cmd_line = true; 2631 // -Xshare:off 2632 } else if (match_option(option, "-Xshare:off")) { 2633 UseSharedSpaces = false; 2634 RequireSharedSpaces = false; 2635 // -Xverify 2636 } else if (match_option(option, "-Xverify", &tail)) { 2637 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2638 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2639 return JNI_EINVAL; 2640 } 2641 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2642 return JNI_EINVAL; 2643 } 2644 } else if (strcmp(tail, ":remote") == 0) { 2645 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2646 return JNI_EINVAL; 2647 } 2648 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2649 return JNI_EINVAL; 2650 } 2651 } else if (strcmp(tail, ":none") == 0) { 2652 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2653 return JNI_EINVAL; 2654 } 2655 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2656 return JNI_EINVAL; 2657 } 2658 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2659 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2660 return JNI_EINVAL; 2661 } 2662 // -Xdebug 2663 } else if (match_option(option, "-Xdebug")) { 2664 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release."); 2665 } else if (match_option(option, "-Xloggc:", &tail)) { 2666 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2667 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2668 _legacyGCLogging.lastFlag = 2; 2669 _legacyGCLogging.file = os::strdup_check_oom(tail); 2670 } else if (match_option(option, "-Xlog", &tail)) { 2671 bool ret = false; 2672 if (strcmp(tail, ":help") == 0) { 2673 fileStream stream(defaultStream::output_stream()); 2674 LogConfiguration::print_command_line_help(&stream); 2675 vm_exit(0); 2676 } else if (strcmp(tail, ":disable") == 0) { 2677 LogConfiguration::disable_logging(); 2678 ret = true; 2679 } else if (strcmp(tail, ":async") == 0) { 2680 LogConfiguration::set_async_mode(true); 2681 ret = true; 2682 } else if (*tail == '\0') { 2683 ret = LogConfiguration::parse_command_line_arguments(); 2684 assert(ret, "-Xlog without arguments should never fail to parse"); 2685 } else if (*tail == ':') { 2686 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2687 } 2688 if (ret == false) { 2689 jio_fprintf(defaultStream::error_stream(), 2690 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2691 tail); 2692 return JNI_EINVAL; 2693 } 2694 // JNI hooks 2695 } else if (match_option(option, "-Xcheck", &tail)) { 2696 if (!strcmp(tail, ":jni")) { 2697 #if !INCLUDE_JNI_CHECK 2698 warning("JNI CHECKING is not supported in this VM"); 2699 #else 2700 CheckJNICalls = true; 2701 #endif // INCLUDE_JNI_CHECK 2702 } else if (is_bad_option(option, args->ignoreUnrecognized, 2703 "check")) { 2704 return JNI_EINVAL; 2705 } 2706 } else if (match_option(option, "vfprintf")) { 2707 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2708 } else if (match_option(option, "exit")) { 2709 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2710 } else if (match_option(option, "abort")) { 2711 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2712 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2713 // and the last option wins. 2714 } else if (match_option(option, "-XX:+NeverTenure")) { 2715 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2716 return JNI_EINVAL; 2717 } 2718 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2719 return JNI_EINVAL; 2720 } 2721 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2722 return JNI_EINVAL; 2723 } 2724 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2725 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2726 return JNI_EINVAL; 2727 } 2728 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2729 return JNI_EINVAL; 2730 } 2731 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2732 return JNI_EINVAL; 2733 } 2734 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2735 uint max_tenuring_thresh = 0; 2736 if (!parse_uint(tail, &max_tenuring_thresh, 0)) { 2737 jio_fprintf(defaultStream::error_stream(), 2738 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2739 return JNI_EINVAL; 2740 } 2741 2742 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2743 return JNI_EINVAL; 2744 } 2745 2746 if (MaxTenuringThreshold == 0) { 2747 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2748 return JNI_EINVAL; 2749 } 2750 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2751 return JNI_EINVAL; 2752 } 2753 } else { 2754 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2755 return JNI_EINVAL; 2756 } 2757 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2758 return JNI_EINVAL; 2759 } 2760 } 2761 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2762 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2763 return JNI_EINVAL; 2764 } 2765 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2766 return JNI_EINVAL; 2767 } 2768 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2769 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2770 return JNI_EINVAL; 2771 } 2772 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2773 return JNI_EINVAL; 2774 } 2775 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2776 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2777 return JNI_EINVAL; 2778 } 2779 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2780 return JNI_EINVAL; 2781 } 2782 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2783 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2784 return JNI_EINVAL; 2785 } 2786 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2787 return JNI_EINVAL; 2788 } 2789 } else if (match_option(option, "--finalization=", &tail)) { 2790 if (strcmp(tail, "enabled") == 0) { 2791 InstanceKlass::set_finalization_enabled(true); 2792 } else if (strcmp(tail, "disabled") == 0) { 2793 InstanceKlass::set_finalization_enabled(false); 2794 } else { 2795 jio_fprintf(defaultStream::error_stream(), 2796 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2797 tail); 2798 return JNI_EINVAL; 2799 } 2800 #if !defined(DTRACE_ENABLED) 2801 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2802 jio_fprintf(defaultStream::error_stream(), 2803 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2804 return JNI_EINVAL; 2805 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2806 jio_fprintf(defaultStream::error_stream(), 2807 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2808 return JNI_EINVAL; 2809 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2810 jio_fprintf(defaultStream::error_stream(), 2811 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2812 return JNI_EINVAL; 2813 #endif // !defined(DTRACE_ENABLED) 2814 #ifdef ASSERT 2815 } else if (match_option(option, "-XX:+FullGCALot")) { 2816 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2817 return JNI_EINVAL; 2818 } 2819 #endif 2820 #if !INCLUDE_MANAGEMENT 2821 } else if (match_option(option, "-XX:+ManagementServer")) { 2822 jio_fprintf(defaultStream::error_stream(), 2823 "ManagementServer is not supported in this VM.\n"); 2824 return JNI_ERR; 2825 #endif // INCLUDE_MANAGEMENT 2826 #if INCLUDE_JVMCI 2827 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) { 2828 if (EnableJVMCIProduct) { 2829 jio_fprintf(defaultStream::error_stream(), 2830 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n"); 2831 return JNI_EINVAL; 2832 } 2833 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) { 2834 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT"); 2835 if (use_graal_jit) { 2836 const char* jvmci_compiler = get_property("jvmci.Compiler"); 2837 if (jvmci_compiler != nullptr) { 2838 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) { 2839 jio_fprintf(defaultStream::error_stream(), 2840 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler); 2841 return JNI_ERR; 2842 } 2843 } else if (!add_property("jvmci.Compiler=graal")) { 2844 return JNI_ENOMEM; 2845 } 2846 } 2847 2848 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before 2849 if (EnableJVMCIProduct) { 2850 continue; 2851 } 2852 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2853 // Allow this flag if it has been unlocked. 2854 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) { 2855 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) { 2856 jio_fprintf(defaultStream::error_stream(), 2857 "Unable to enable JVMCI in product mode\n"); 2858 return JNI_ERR; 2859 } 2860 } 2861 // The flag was locked so process normally to report that error 2862 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2863 return JNI_EINVAL; 2864 } 2865 #endif // INCLUDE_JVMCI 2866 #if INCLUDE_JFR 2867 } else if (match_jfr_option(&option)) { 2868 return JNI_EINVAL; 2869 #endif 2870 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2871 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2872 // already been handled 2873 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2874 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2875 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2876 return JNI_EINVAL; 2877 } 2878 } 2879 // Unknown option 2880 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2881 return JNI_ERR; 2882 } 2883 } 2884 2885 // PrintSharedArchiveAndExit will turn on 2886 // -Xshare:on 2887 // -Xlog:class+path=info 2888 if (PrintSharedArchiveAndExit) { 2889 UseSharedSpaces = true; 2890 RequireSharedSpaces = true; 2891 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2892 } 2893 2894 fix_appclasspath(); 2895 2896 return JNI_OK; 2897 } 2898 2899 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) { 2900 if (!allow_cds) { 2901 CDSConfig::set_module_patching_disables_cds(); 2902 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2903 CDSConfig::set_java_base_module_patching_disables_cds(); 2904 } 2905 } 2906 2907 // Create GrowableArray lazily, only if --patch-module has been specified 2908 if (_patch_mod_prefix == nullptr) { 2909 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2910 } 2911 2912 // Scan patches for matching module 2913 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) { 2914 return (strcmp(module_name, patch->module_name()) == 0); 2915 }); 2916 if (i == -1) { 2917 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2918 } else { 2919 if (allow_append) { 2920 // append path to existing module entry 2921 _patch_mod_prefix->at(i)->append_path(path); 2922 } else { 2923 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2924 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2925 } else { 2926 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name); 2927 } 2928 } 2929 } 2930 } 2931 2932 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2933 // 2934 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2935 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2936 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2937 // path is treated as the current directory. 2938 // 2939 // This causes problems with CDS, which requires that all directories specified in the classpath 2940 // must be empty. In most cases, applications do NOT want to load classes from the current 2941 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2942 // scripts compatible with CDS. 2943 void Arguments::fix_appclasspath() { 2944 if (IgnoreEmptyClassPaths) { 2945 const char separator = *os::path_separator(); 2946 const char* src = _java_class_path->value(); 2947 2948 // skip over all the leading empty paths 2949 while (*src == separator) { 2950 src ++; 2951 } 2952 2953 char* copy = os::strdup_check_oom(src, mtArguments); 2954 2955 // trim all trailing empty paths 2956 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 2957 *tail = '\0'; 2958 } 2959 2960 char from[3] = {separator, separator, '\0'}; 2961 char to [2] = {separator, '\0'}; 2962 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 2963 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 2964 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 2965 } 2966 2967 _java_class_path->set_writeable_value(copy); 2968 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 2969 } 2970 } 2971 2972 jint Arguments::finalize_vm_init_args() { 2973 // check if the default lib/endorsed directory exists; if so, error 2974 char path[JVM_MAXPATHLEN]; 2975 const char* fileSep = os::file_separator(); 2976 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 2977 2978 DIR* dir = os::opendir(path); 2979 if (dir != nullptr) { 2980 jio_fprintf(defaultStream::output_stream(), 2981 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 2982 "in modular form will be supported via the concept of upgradeable modules.\n"); 2983 os::closedir(dir); 2984 return JNI_ERR; 2985 } 2986 2987 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 2988 dir = os::opendir(path); 2989 if (dir != nullptr) { 2990 jio_fprintf(defaultStream::output_stream(), 2991 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 2992 "Use -classpath instead.\n."); 2993 os::closedir(dir); 2994 return JNI_ERR; 2995 } 2996 2997 // This must be done after all arguments have been processed 2998 // and the container support has been initialized since AggressiveHeap 2999 // relies on the amount of total memory available. 3000 if (AggressiveHeap) { 3001 jint result = set_aggressive_heap_flags(); 3002 if (result != JNI_OK) { 3003 return result; 3004 } 3005 } 3006 3007 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3008 // but like -Xint, leave compilation thresholds unaffected. 3009 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3010 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3011 set_mode_flags(_int); 3012 } 3013 3014 #ifdef ZERO 3015 // Zero always runs in interpreted mode 3016 set_mode_flags(_int); 3017 #endif 3018 3019 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3020 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3021 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3022 } 3023 3024 #if !COMPILER2_OR_JVMCI 3025 // Don't degrade server performance for footprint 3026 if (FLAG_IS_DEFAULT(UseLargePages) && 3027 MaxHeapSize < LargePageHeapSizeThreshold) { 3028 // No need for large granularity pages w/small heaps. 3029 // Note that large pages are enabled/disabled for both the 3030 // Java heap and the code cache. 3031 FLAG_SET_DEFAULT(UseLargePages, false); 3032 } 3033 3034 UNSUPPORTED_OPTION(ProfileInterpreter); 3035 #endif 3036 3037 // Parse the CompilationMode flag 3038 if (!CompilationModeFlag::initialize()) { 3039 return JNI_ERR; 3040 } 3041 3042 if (!check_vm_args_consistency()) { 3043 return JNI_ERR; 3044 } 3045 3046 // finalize --module-patch and related --enable-preview 3047 if (finalize_patch_module() != JNI_OK) { 3048 return JNI_ERR; 3049 } 3050 3051 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) { 3052 return JNI_ERR; 3053 } 3054 3055 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3056 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3057 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3058 3059 return JNI_OK; 3060 } 3061 3062 // Helper class for controlling the lifetime of JavaVMInitArgs 3063 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3064 // deleted on the destruction of the ScopedVMInitArgs object. 3065 class ScopedVMInitArgs : public StackObj { 3066 private: 3067 JavaVMInitArgs _args; 3068 char* _container_name; 3069 bool _is_set; 3070 char* _vm_options_file_arg; 3071 3072 public: 3073 ScopedVMInitArgs(const char *container_name) { 3074 _args.version = JNI_VERSION_1_2; 3075 _args.nOptions = 0; 3076 _args.options = nullptr; 3077 _args.ignoreUnrecognized = false; 3078 _container_name = (char *)container_name; 3079 _is_set = false; 3080 _vm_options_file_arg = nullptr; 3081 } 3082 3083 // Populates the JavaVMInitArgs object represented by this 3084 // ScopedVMInitArgs object with the arguments in options. The 3085 // allocated memory is deleted by the destructor. If this method 3086 // returns anything other than JNI_OK, then this object is in a 3087 // partially constructed state, and should be abandoned. 3088 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3089 _is_set = true; 3090 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3091 JavaVMOption, options->length(), mtArguments); 3092 if (options_arr == nullptr) { 3093 return JNI_ENOMEM; 3094 } 3095 _args.options = options_arr; 3096 3097 for (int i = 0; i < options->length(); i++) { 3098 options_arr[i] = options->at(i); 3099 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3100 if (options_arr[i].optionString == nullptr) { 3101 // Rely on the destructor to do cleanup. 3102 _args.nOptions = i; 3103 return JNI_ENOMEM; 3104 } 3105 } 3106 3107 _args.nOptions = options->length(); 3108 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3109 return JNI_OK; 3110 } 3111 3112 JavaVMInitArgs* get() { return &_args; } 3113 char* container_name() { return _container_name; } 3114 bool is_set() { return _is_set; } 3115 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; } 3116 char* vm_options_file_arg() { return _vm_options_file_arg; } 3117 3118 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3119 if (_vm_options_file_arg != nullptr) { 3120 os::free(_vm_options_file_arg); 3121 } 3122 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3123 } 3124 3125 ~ScopedVMInitArgs() { 3126 if (_vm_options_file_arg != nullptr) { 3127 os::free(_vm_options_file_arg); 3128 } 3129 if (_args.options == nullptr) return; 3130 for (int i = 0; i < _args.nOptions; i++) { 3131 os::free(_args.options[i].optionString); 3132 } 3133 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3134 } 3135 3136 // Insert options into this option list, to replace option at 3137 // vm_options_file_pos (-XX:VMOptionsFile) 3138 jint insert(const JavaVMInitArgs* args, 3139 const JavaVMInitArgs* args_to_insert, 3140 const int vm_options_file_pos) { 3141 assert(_args.options == nullptr, "shouldn't be set yet"); 3142 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3143 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3144 3145 int length = args->nOptions + args_to_insert->nOptions - 1; 3146 // Construct new option array 3147 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3148 for (int i = 0; i < args->nOptions; i++) { 3149 if (i == vm_options_file_pos) { 3150 // insert the new options starting at the same place as the 3151 // -XX:VMOptionsFile option 3152 for (int j = 0; j < args_to_insert->nOptions; j++) { 3153 options.push(args_to_insert->options[j]); 3154 } 3155 } else { 3156 options.push(args->options[i]); 3157 } 3158 } 3159 // make into options array 3160 return set_args(&options); 3161 } 3162 }; 3163 3164 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3165 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3166 } 3167 3168 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3169 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3170 } 3171 3172 jint Arguments::parse_options_environment_variable(const char* name, 3173 ScopedVMInitArgs* vm_args) { 3174 char *buffer = ::getenv(name); 3175 3176 // Don't check this environment variable if user has special privileges 3177 // (e.g. unix su command). 3178 if (buffer == nullptr || os::have_special_privileges()) { 3179 return JNI_OK; 3180 } 3181 3182 if ((buffer = os::strdup(buffer)) == nullptr) { 3183 return JNI_ENOMEM; 3184 } 3185 3186 jio_fprintf(defaultStream::error_stream(), 3187 "Picked up %s: %s\n", name, buffer); 3188 3189 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3190 3191 os::free(buffer); 3192 return retcode; 3193 } 3194 3195 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3196 // read file into buffer 3197 int fd = ::open(file_name, O_RDONLY); 3198 if (fd < 0) { 3199 jio_fprintf(defaultStream::error_stream(), 3200 "Could not open options file '%s'\n", 3201 file_name); 3202 return JNI_ERR; 3203 } 3204 3205 struct stat stbuf; 3206 int retcode = os::stat(file_name, &stbuf); 3207 if (retcode != 0) { 3208 jio_fprintf(defaultStream::error_stream(), 3209 "Could not stat options file '%s'\n", 3210 file_name); 3211 ::close(fd); 3212 return JNI_ERR; 3213 } 3214 3215 if (stbuf.st_size == 0) { 3216 // tell caller there is no option data and that is ok 3217 ::close(fd); 3218 return JNI_OK; 3219 } 3220 3221 // '+ 1' for null termination even with max bytes 3222 size_t bytes_alloc = stbuf.st_size + 1; 3223 3224 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3225 if (nullptr == buf) { 3226 jio_fprintf(defaultStream::error_stream(), 3227 "Could not allocate read buffer for options file parse\n"); 3228 ::close(fd); 3229 return JNI_ENOMEM; 3230 } 3231 3232 memset(buf, 0, bytes_alloc); 3233 3234 // Fill buffer 3235 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3236 ::close(fd); 3237 if (bytes_read < 0) { 3238 FREE_C_HEAP_ARRAY(char, buf); 3239 jio_fprintf(defaultStream::error_stream(), 3240 "Could not read options file '%s'\n", file_name); 3241 return JNI_ERR; 3242 } 3243 3244 if (bytes_read == 0) { 3245 // tell caller there is no option data and that is ok 3246 FREE_C_HEAP_ARRAY(char, buf); 3247 return JNI_OK; 3248 } 3249 3250 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3251 3252 FREE_C_HEAP_ARRAY(char, buf); 3253 return retcode; 3254 } 3255 3256 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3257 // Construct option array 3258 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3259 3260 // some pointers to help with parsing 3261 char *buffer_end = buffer + buf_len; 3262 char *opt_hd = buffer; 3263 char *wrt = buffer; 3264 char *rd = buffer; 3265 3266 // parse all options 3267 while (rd < buffer_end) { 3268 // skip leading white space from the input string 3269 while (rd < buffer_end && isspace(*rd)) { 3270 rd++; 3271 } 3272 3273 if (rd >= buffer_end) { 3274 break; 3275 } 3276 3277 // Remember this is where we found the head of the token. 3278 opt_hd = wrt; 3279 3280 // Tokens are strings of non white space characters separated 3281 // by one or more white spaces. 3282 while (rd < buffer_end && !isspace(*rd)) { 3283 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3284 int quote = *rd; // matching quote to look for 3285 rd++; // don't copy open quote 3286 while (rd < buffer_end && *rd != quote) { 3287 // include everything (even spaces) 3288 // up until the close quote 3289 *wrt++ = *rd++; // copy to option string 3290 } 3291 3292 if (rd < buffer_end) { 3293 rd++; // don't copy close quote 3294 } else { 3295 // did not see closing quote 3296 jio_fprintf(defaultStream::error_stream(), 3297 "Unmatched quote in %s\n", name); 3298 return JNI_ERR; 3299 } 3300 } else { 3301 *wrt++ = *rd++; // copy to option string 3302 } 3303 } 3304 3305 // steal a white space character and set it to null 3306 *wrt++ = '\0'; 3307 // We now have a complete token 3308 3309 JavaVMOption option; 3310 option.optionString = opt_hd; 3311 option.extraInfo = nullptr; 3312 3313 options.append(option); // Fill in option 3314 3315 rd++; // Advance to next character 3316 } 3317 3318 // Fill out JavaVMInitArgs structure. 3319 return vm_args->set_args(&options); 3320 } 3321 3322 #ifndef PRODUCT 3323 // Determine whether LogVMOutput should be implicitly turned on. 3324 static bool use_vm_log() { 3325 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3326 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3327 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3328 PrintAssembly || TraceDeoptimization || 3329 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3330 return true; 3331 } 3332 3333 #ifdef COMPILER1 3334 if (PrintC1Statistics) { 3335 return true; 3336 } 3337 #endif // COMPILER1 3338 3339 #ifdef COMPILER2 3340 if (PrintOptoAssembly || PrintOptoStatistics) { 3341 return true; 3342 } 3343 #endif // COMPILER2 3344 3345 return false; 3346 } 3347 3348 #endif // PRODUCT 3349 3350 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3351 for (int index = 0; index < args->nOptions; index++) { 3352 const JavaVMOption* option = args->options + index; 3353 const char* tail; 3354 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3355 return true; 3356 } 3357 } 3358 return false; 3359 } 3360 3361 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3362 const char* vm_options_file, 3363 const int vm_options_file_pos, 3364 ScopedVMInitArgs* vm_options_file_args, 3365 ScopedVMInitArgs* args_out) { 3366 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3367 if (code != JNI_OK) { 3368 return code; 3369 } 3370 3371 if (vm_options_file_args->get()->nOptions < 1) { 3372 return JNI_OK; 3373 } 3374 3375 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3376 jio_fprintf(defaultStream::error_stream(), 3377 "A VM options file may not refer to a VM options file. " 3378 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3379 "options file '%s' in options container '%s' is an error.\n", 3380 vm_options_file_args->vm_options_file_arg(), 3381 vm_options_file_args->container_name()); 3382 return JNI_EINVAL; 3383 } 3384 3385 return args_out->insert(args, vm_options_file_args->get(), 3386 vm_options_file_pos); 3387 } 3388 3389 // Expand -XX:VMOptionsFile found in args_in as needed. 3390 // mod_args and args_out parameters may return values as needed. 3391 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3392 ScopedVMInitArgs* mod_args, 3393 JavaVMInitArgs** args_out) { 3394 jint code = match_special_option_and_act(args_in, mod_args); 3395 if (code != JNI_OK) { 3396 return code; 3397 } 3398 3399 if (mod_args->is_set()) { 3400 // args_in contains -XX:VMOptionsFile and mod_args contains the 3401 // original options from args_in along with the options expanded 3402 // from the VMOptionsFile. Return a short-hand to the caller. 3403 *args_out = mod_args->get(); 3404 } else { 3405 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3406 } 3407 return JNI_OK; 3408 } 3409 3410 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3411 ScopedVMInitArgs* args_out) { 3412 // Remaining part of option string 3413 const char* tail; 3414 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3415 3416 for (int index = 0; index < args->nOptions; index++) { 3417 const JavaVMOption* option = args->options + index; 3418 if (match_option(option, "-XX:Flags=", &tail)) { 3419 Arguments::set_jvm_flags_file(tail); 3420 continue; 3421 } 3422 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3423 if (vm_options_file_args.found_vm_options_file_arg()) { 3424 jio_fprintf(defaultStream::error_stream(), 3425 "The option '%s' is already specified in the options " 3426 "container '%s' so the specification of '%s' in the " 3427 "same options container is an error.\n", 3428 vm_options_file_args.vm_options_file_arg(), 3429 vm_options_file_args.container_name(), 3430 option->optionString); 3431 return JNI_EINVAL; 3432 } 3433 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3434 // If there's a VMOptionsFile, parse that 3435 jint code = insert_vm_options_file(args, tail, index, 3436 &vm_options_file_args, args_out); 3437 if (code != JNI_OK) { 3438 return code; 3439 } 3440 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3441 if (args_out->is_set()) { 3442 // The VMOptions file inserted some options so switch 'args' 3443 // to the new set of options, and continue processing which 3444 // preserves "last option wins" semantics. 3445 args = args_out->get(); 3446 // The first option from the VMOptionsFile replaces the 3447 // current option. So we back track to process the 3448 // replacement option. 3449 index--; 3450 } 3451 continue; 3452 } 3453 if (match_option(option, "-XX:+PrintVMOptions")) { 3454 PrintVMOptions = true; 3455 continue; 3456 } 3457 if (match_option(option, "-XX:-PrintVMOptions")) { 3458 PrintVMOptions = false; 3459 continue; 3460 } 3461 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3462 IgnoreUnrecognizedVMOptions = true; 3463 continue; 3464 } 3465 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3466 IgnoreUnrecognizedVMOptions = false; 3467 continue; 3468 } 3469 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3470 JVMFlag::printFlags(tty, false); 3471 vm_exit(0); 3472 } 3473 3474 #ifndef PRODUCT 3475 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3476 JVMFlag::printFlags(tty, true); 3477 vm_exit(0); 3478 } 3479 #endif 3480 } 3481 return JNI_OK; 3482 } 3483 3484 static void print_options(const JavaVMInitArgs *args) { 3485 const char* tail; 3486 for (int index = 0; index < args->nOptions; index++) { 3487 const JavaVMOption *option = args->options + index; 3488 if (match_option(option, "-XX:", &tail)) { 3489 logOption(tail); 3490 } 3491 } 3492 } 3493 3494 bool Arguments::handle_deprecated_print_gc_flags() { 3495 if (PrintGC) { 3496 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3497 } 3498 if (PrintGCDetails) { 3499 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3500 } 3501 3502 if (_legacyGCLogging.lastFlag == 2) { 3503 // -Xloggc was used to specify a filename 3504 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3505 3506 LogTarget(Error, logging) target; 3507 LogStream errstream(target); 3508 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream); 3509 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3510 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3511 } 3512 return true; 3513 } 3514 3515 static void apply_debugger_ergo() { 3516 #ifdef ASSERT 3517 if (ReplayCompiles) { 3518 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3519 } 3520 3521 if (UseDebuggerErgo) { 3522 // Turn on sub-flags 3523 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3524 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3525 } 3526 3527 if (UseDebuggerErgo2) { 3528 // Debugging with limited number of CPUs 3529 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3530 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3531 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3532 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3533 } 3534 #endif // ASSERT 3535 } 3536 3537 // Parse entry point called from JNI_CreateJavaVM 3538 3539 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3540 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3541 JVMFlag::check_all_flag_declarations(); 3542 3543 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3544 const char* hotspotrc = ".hotspotrc"; 3545 bool settings_file_specified = false; 3546 bool needs_hotspotrc_warning = false; 3547 ScopedVMInitArgs initial_vm_options_args(""); 3548 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3549 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3550 3551 // Pointers to current working set of containers 3552 JavaVMInitArgs* cur_cmd_args; 3553 JavaVMInitArgs* cur_vm_options_args; 3554 JavaVMInitArgs* cur_java_options_args; 3555 JavaVMInitArgs* cur_java_tool_options_args; 3556 3557 // Containers for modified/expanded options 3558 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3559 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3560 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3561 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3562 3563 3564 jint code = 3565 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3566 if (code != JNI_OK) { 3567 return code; 3568 } 3569 3570 code = parse_java_options_environment_variable(&initial_java_options_args); 3571 if (code != JNI_OK) { 3572 return code; 3573 } 3574 3575 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3576 char *vmoptions = ClassLoader::lookup_vm_options(); 3577 if (vmoptions != nullptr) { 3578 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3579 FREE_C_HEAP_ARRAY(char, vmoptions); 3580 if (code != JNI_OK) { 3581 return code; 3582 } 3583 } 3584 3585 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3586 &mod_java_tool_options_args, 3587 &cur_java_tool_options_args); 3588 if (code != JNI_OK) { 3589 return code; 3590 } 3591 3592 code = expand_vm_options_as_needed(initial_cmd_args, 3593 &mod_cmd_args, 3594 &cur_cmd_args); 3595 if (code != JNI_OK) { 3596 return code; 3597 } 3598 3599 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3600 &mod_java_options_args, 3601 &cur_java_options_args); 3602 if (code != JNI_OK) { 3603 return code; 3604 } 3605 3606 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3607 &mod_vm_options_args, 3608 &cur_vm_options_args); 3609 if (code != JNI_OK) { 3610 return code; 3611 } 3612 3613 const char* flags_file = Arguments::get_jvm_flags_file(); 3614 settings_file_specified = (flags_file != nullptr); 3615 3616 if (IgnoreUnrecognizedVMOptions) { 3617 cur_cmd_args->ignoreUnrecognized = true; 3618 cur_java_tool_options_args->ignoreUnrecognized = true; 3619 cur_java_options_args->ignoreUnrecognized = true; 3620 } 3621 3622 // Parse specified settings file 3623 if (settings_file_specified) { 3624 if (!process_settings_file(flags_file, true, 3625 cur_cmd_args->ignoreUnrecognized)) { 3626 return JNI_EINVAL; 3627 } 3628 } else { 3629 #ifdef ASSERT 3630 // Parse default .hotspotrc settings file 3631 if (!process_settings_file(".hotspotrc", false, 3632 cur_cmd_args->ignoreUnrecognized)) { 3633 return JNI_EINVAL; 3634 } 3635 #else 3636 struct stat buf; 3637 if (os::stat(hotspotrc, &buf) == 0) { 3638 needs_hotspotrc_warning = true; 3639 } 3640 #endif 3641 } 3642 3643 if (PrintVMOptions) { 3644 print_options(cur_java_tool_options_args); 3645 print_options(cur_cmd_args); 3646 print_options(cur_java_options_args); 3647 } 3648 3649 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3650 jint result = parse_vm_init_args(cur_vm_options_args, 3651 cur_java_tool_options_args, 3652 cur_java_options_args, 3653 cur_cmd_args); 3654 3655 if (result != JNI_OK) { 3656 return result; 3657 } 3658 3659 // Delay warning until here so that we've had a chance to process 3660 // the -XX:-PrintWarnings flag 3661 if (needs_hotspotrc_warning) { 3662 warning("%s file is present but has been ignored. " 3663 "Run with -XX:Flags=%s to load the file.", 3664 hotspotrc, hotspotrc); 3665 } 3666 3667 if (needs_module_property_warning) { 3668 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3669 " names that are reserved for internal use."); 3670 } 3671 3672 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3673 UNSUPPORTED_OPTION(UseLargePages); 3674 #endif 3675 3676 #if defined(AIX) 3677 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3678 #endif 3679 3680 #ifndef PRODUCT 3681 if (TraceBytecodesAt != 0) { 3682 TraceBytecodes = true; 3683 } 3684 #endif // PRODUCT 3685 3686 if (ScavengeRootsInCode == 0) { 3687 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3688 warning("Forcing ScavengeRootsInCode non-zero"); 3689 } 3690 ScavengeRootsInCode = 1; 3691 } 3692 3693 if (!handle_deprecated_print_gc_flags()) { 3694 return JNI_EINVAL; 3695 } 3696 3697 // Set object alignment values. 3698 set_object_alignment(); 3699 3700 #if !INCLUDE_CDS 3701 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) { 3702 jio_fprintf(defaultStream::error_stream(), 3703 "Shared spaces are not supported in this VM\n"); 3704 return JNI_ERR; 3705 } 3706 if (DumpLoadedClassList != nullptr) { 3707 jio_fprintf(defaultStream::error_stream(), 3708 "DumpLoadedClassList is not supported in this VM\n"); 3709 return JNI_ERR; 3710 } 3711 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) || 3712 log_is_enabled(Info, cds)) { 3713 warning("Shared spaces are not supported in this VM"); 3714 UseSharedSpaces = false; 3715 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3716 } 3717 no_shared_spaces("CDS Disabled"); 3718 #endif // INCLUDE_CDS 3719 3720 // Verify NMT arguments 3721 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 3722 if (lvl == NMT_unknown) { 3723 jio_fprintf(defaultStream::error_stream(), 3724 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n"); 3725 return JNI_ERR; 3726 } 3727 if (PrintNMTStatistics && lvl == NMT_off) { 3728 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 3729 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 3730 } 3731 3732 bool trace_dependencies = log_is_enabled(Debug, dependencies); 3733 if (trace_dependencies && VerifyDependencies) { 3734 warning("dependency logging results may be inflated by VerifyDependencies"); 3735 } 3736 3737 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) || 3738 log_is_enabled(Info, class, load, cause); 3739 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) { 3740 warning("class load cause logging will not produce output without LogClassLoadingCauseFor"); 3741 } 3742 3743 apply_debugger_ergo(); 3744 3745 // The VMThread needs to stop now and then to execute these debug options. 3746 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) { 3747 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000); 3748 } 3749 3750 if (log_is_enabled(Info, arguments)) { 3751 LogStream st(Log(arguments)::info()); 3752 Arguments::print_on(&st); 3753 } 3754 3755 return JNI_OK; 3756 } 3757 3758 jint Arguments::apply_ergo() { 3759 // Set flags based on ergonomics. 3760 jint result = set_ergonomics_flags(); 3761 if (result != JNI_OK) return result; 3762 3763 // Set heap size based on available physical memory 3764 set_heap_size(); 3765 3766 GCConfig::arguments()->initialize(); 3767 3768 CDSConfig::initialize(); 3769 3770 // Initialize Metaspace flags and alignments 3771 Metaspace::ergo_initialize(); 3772 3773 if (!StringDedup::ergo_initialize()) { 3774 return JNI_EINVAL; 3775 } 3776 3777 // Set compiler flags after GC is selected and GC specific 3778 // flags (LoopStripMiningIter) are set. 3779 CompilerConfig::ergo_initialize(); 3780 3781 // Set bytecode rewriting flags 3782 set_bytecode_flags(); 3783 3784 // Set flags if aggressive optimization flags are enabled 3785 jint code = set_aggressive_opts_flags(); 3786 if (code != JNI_OK) { 3787 return code; 3788 } 3789 3790 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) { 3791 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table()); 3792 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) { 3793 warning("UseSecondarySupersTable is not supported"); 3794 FLAG_SET_DEFAULT(UseSecondarySupersTable, false); 3795 } 3796 if (!UseSecondarySupersTable) { 3797 FLAG_SET_DEFAULT(StressSecondarySupers, false); 3798 FLAG_SET_DEFAULT(VerifySecondarySupers, false); 3799 } 3800 3801 #ifdef ZERO 3802 // Clear flags not supported on zero. 3803 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3804 #endif // ZERO 3805 3806 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3807 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3808 DebugNonSafepoints = true; 3809 } 3810 3811 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3812 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3813 } 3814 3815 // Treat the odd case where local verification is enabled but remote 3816 // verification is not as if both were enabled. 3817 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 3818 log_info(verification)("Turning on remote verification because local verification is on"); 3819 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 3820 } 3821 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) { 3822 // Disable calling convention optimizations if inline types are not supported. 3823 // Also these aren't useful in -Xint. However, don't disable them when dumping or using 3824 // the CDS archive, as the values must match between dumptime and runtime. 3825 InlineTypePassFieldsAsArgs = false; 3826 InlineTypeReturnedAsFields = false; 3827 } 3828 3829 #ifndef PRODUCT 3830 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3831 if (use_vm_log()) { 3832 LogVMOutput = true; 3833 } 3834 } 3835 #endif // PRODUCT 3836 3837 if (PrintCommandLineFlags) { 3838 JVMFlag::printSetFlags(tty); 3839 } 3840 3841 #if COMPILER2_OR_JVMCI 3842 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 3843 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 3844 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 3845 } 3846 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 3847 3848 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 3849 if (!EnableVectorReboxing) { 3850 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 3851 } else { 3852 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 3853 } 3854 } 3855 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 3856 3857 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 3858 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 3859 } 3860 FLAG_SET_DEFAULT(UseVectorStubs, false); 3861 } 3862 #endif // COMPILER2_OR_JVMCI 3863 3864 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 3865 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 3866 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 3867 } 3868 } 3869 return JNI_OK; 3870 } 3871 3872 jint Arguments::adjust_after_os() { 3873 if (UseNUMA) { 3874 if (UseParallelGC) { 3875 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3876 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3877 } 3878 } 3879 } 3880 return JNI_OK; 3881 } 3882 3883 int Arguments::PropertyList_count(SystemProperty* pl) { 3884 int count = 0; 3885 while(pl != nullptr) { 3886 count++; 3887 pl = pl->next(); 3888 } 3889 return count; 3890 } 3891 3892 // Return the number of readable properties. 3893 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 3894 int count = 0; 3895 while(pl != nullptr) { 3896 if (pl->readable()) { 3897 count++; 3898 } 3899 pl = pl->next(); 3900 } 3901 return count; 3902 } 3903 3904 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3905 assert(key != nullptr, "just checking"); 3906 SystemProperty* prop; 3907 for (prop = pl; prop != nullptr; prop = prop->next()) { 3908 if (strcmp(key, prop->key()) == 0) return prop->value(); 3909 } 3910 return nullptr; 3911 } 3912 3913 // Return the value of the requested property provided that it is a readable property. 3914 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 3915 assert(key != nullptr, "just checking"); 3916 SystemProperty* prop; 3917 // Return the property value if the keys match and the property is not internal or 3918 // it's the special internal property "jdk.boot.class.path.append". 3919 for (prop = pl; prop != nullptr; prop = prop->next()) { 3920 if (strcmp(key, prop->key()) == 0) { 3921 if (!prop->internal()) { 3922 return prop->value(); 3923 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 3924 return prop->value(); 3925 } else { 3926 // Property is internal and not jdk.boot.class.path.append so return null. 3927 return nullptr; 3928 } 3929 } 3930 } 3931 return nullptr; 3932 } 3933 3934 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3935 SystemProperty* p = *plist; 3936 if (p == nullptr) { 3937 *plist = new_p; 3938 } else { 3939 while (p->next() != nullptr) { 3940 p = p->next(); 3941 } 3942 p->set_next(new_p); 3943 } 3944 } 3945 3946 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 3947 bool writeable, bool internal) { 3948 if (plist == nullptr) 3949 return; 3950 3951 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 3952 PropertyList_add(plist, new_p); 3953 } 3954 3955 void Arguments::PropertyList_add(SystemProperty *element) { 3956 PropertyList_add(&_system_properties, element); 3957 } 3958 3959 // This add maintains unique property key in the list. 3960 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 3961 PropertyAppendable append, PropertyWriteable writeable, 3962 PropertyInternal internal) { 3963 if (plist == nullptr) 3964 return; 3965 3966 // If property key exists and is writeable, then update with new value. 3967 // Trying to update a non-writeable property is silently ignored. 3968 SystemProperty* prop; 3969 for (prop = *plist; prop != nullptr; prop = prop->next()) { 3970 if (strcmp(k, prop->key()) == 0) { 3971 if (append == AppendProperty) { 3972 prop->append_writeable_value(v); 3973 } else { 3974 prop->set_writeable_value(v); 3975 } 3976 return; 3977 } 3978 } 3979 3980 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 3981 } 3982 3983 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3984 // Returns true if all of the source pointed by src has been copied over to 3985 // the destination buffer pointed by buf. Otherwise, returns false. 3986 // Notes: 3987 // 1. If the length (buflen) of the destination buffer excluding the 3988 // null terminator character is not long enough for holding the expanded 3989 // pid characters, it also returns false instead of returning the partially 3990 // expanded one. 3991 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3992 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3993 char* buf, size_t buflen) { 3994 const char* p = src; 3995 char* b = buf; 3996 const char* src_end = &src[srclen]; 3997 char* buf_end = &buf[buflen - 1]; 3998 3999 while (p < src_end && b < buf_end) { 4000 if (*p == '%') { 4001 switch (*(++p)) { 4002 case '%': // "%%" ==> "%" 4003 *b++ = *p++; 4004 break; 4005 case 'p': { // "%p" ==> current process id 4006 // buf_end points to the character before the last character so 4007 // that we could write '\0' to the end of the buffer. 4008 size_t buf_sz = buf_end - b + 1; 4009 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4010 4011 // if jio_snprintf fails or the buffer is not long enough to hold 4012 // the expanded pid, returns false. 4013 if (ret < 0 || ret >= (int)buf_sz) { 4014 return false; 4015 } else { 4016 b += ret; 4017 assert(*b == '\0', "fail in copy_expand_pid"); 4018 if (p == src_end && b == buf_end + 1) { 4019 // reach the end of the buffer. 4020 return true; 4021 } 4022 } 4023 p++; 4024 break; 4025 } 4026 default : 4027 *b++ = '%'; 4028 } 4029 } else { 4030 *b++ = *p++; 4031 } 4032 } 4033 *b = '\0'; 4034 return (p == src_end); // return false if not all of the source was copied 4035 }