1 /* 2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/cds_globals.hpp" 27 #include "cds/filemap.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/moduleEntry.hpp" 31 #include "classfile/stringTable.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "compiler/compilerDefinitions.hpp" 34 #include "gc/shared/gcArguments.hpp" 35 #include "gc/shared/gcConfig.hpp" 36 #include "gc/shared/stringdedup/stringDedup.hpp" 37 #include "gc/shared/tlab_globals.hpp" 38 #include "jvm.h" 39 #include "logging/log.hpp" 40 #include "logging/logConfiguration.hpp" 41 #include "logging/logStream.hpp" 42 #include "logging/logTag.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/oop.inline.hpp" 46 #include "prims/jvmtiAgentList.hpp" 47 #include "prims/jvmtiExport.hpp" 48 #include "runtime/arguments.hpp" 49 #include "runtime/flags/jvmFlag.hpp" 50 #include "runtime/flags/jvmFlagAccess.hpp" 51 #include "runtime/flags/jvmFlagLimit.hpp" 52 #include "runtime/globals_extension.hpp" 53 #include "runtime/java.hpp" 54 #include "runtime/os.hpp" 55 #include "runtime/safepoint.hpp" 56 #include "runtime/safepointMechanism.hpp" 57 #include "runtime/synchronizer.hpp" 58 #include "runtime/vm_version.hpp" 59 #include "services/management.hpp" 60 #include "services/nmtCommon.hpp" 61 #include "utilities/align.hpp" 62 #include "utilities/debug.hpp" 63 #include "utilities/defaultStream.hpp" 64 #include "utilities/macros.hpp" 65 #include "utilities/parseInteger.hpp" 66 #include "utilities/powerOfTwo.hpp" 67 #include "utilities/stringUtils.hpp" 68 #include "utilities/systemMemoryBarrier.hpp" 69 #if INCLUDE_JFR 70 #include "jfr/jfr.hpp" 71 #endif 72 73 #include <limits> 74 75 static const char _default_java_launcher[] = "generic"; 76 77 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher 78 79 char* Arguments::_jvm_flags_file = nullptr; 80 char** Arguments::_jvm_flags_array = nullptr; 81 int Arguments::_num_jvm_flags = 0; 82 char** Arguments::_jvm_args_array = nullptr; 83 int Arguments::_num_jvm_args = 0; 84 char* Arguments::_java_command = nullptr; 85 SystemProperty* Arguments::_system_properties = nullptr; 86 size_t Arguments::_conservative_max_heap_alignment = 0; 87 Arguments::Mode Arguments::_mode = _mixed; 88 bool Arguments::_xdebug_mode = false; 89 const char* Arguments::_java_vendor_url_bug = nullptr; 90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 91 bool Arguments::_sun_java_launcher_is_altjvm = false; 92 93 // These parameters are reset in method parse_vm_init_args() 94 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 95 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 96 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 97 bool Arguments::_ClipInlining = ClipInlining; 98 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 99 100 bool Arguments::_enable_preview = false; 101 102 char* Arguments::_default_shared_archive_path = nullptr; 103 char* Arguments::SharedArchivePath = nullptr; 104 char* Arguments::SharedDynamicArchivePath = nullptr; 105 106 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 }; 107 108 // These are not set by the JDK's built-in launchers, but they can be set by 109 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 110 // JavaVMOption in jni.h. 111 abort_hook_t Arguments::_abort_hook = nullptr; 112 exit_hook_t Arguments::_exit_hook = nullptr; 113 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr; 114 115 116 SystemProperty *Arguments::_sun_boot_library_path = nullptr; 117 SystemProperty *Arguments::_java_library_path = nullptr; 118 SystemProperty *Arguments::_java_home = nullptr; 119 SystemProperty *Arguments::_java_class_path = nullptr; 120 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr; 121 SystemProperty *Arguments::_vm_info = nullptr; 122 123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr; 124 PathString *Arguments::_boot_class_path = nullptr; 125 bool Arguments::_has_jimage = false; 126 127 char* Arguments::_ext_dirs = nullptr; 128 129 // True if -Xshare:auto option was specified. 130 static bool xshare_auto_cmd_line = false; 131 132 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 133 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 134 if (new_value == nullptr) { 135 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 136 return false; 137 } 138 if (_value != nullptr) { 139 FreeHeap(_value); 140 } 141 _value = new_value; 142 strcpy(_value, value); 143 return true; 144 } 145 146 void PathString::append_value(const char *value) { 147 char *sp; 148 size_t len = 0; 149 if (value != nullptr) { 150 len = strlen(value); 151 if (_value != nullptr) { 152 len += strlen(_value); 153 } 154 sp = AllocateHeap(len+2, mtArguments); 155 assert(sp != nullptr, "Unable to allocate space for new append path value"); 156 if (sp != nullptr) { 157 if (_value != nullptr) { 158 strcpy(sp, _value); 159 strcat(sp, os::path_separator()); 160 strcat(sp, value); 161 FreeHeap(_value); 162 } else { 163 strcpy(sp, value); 164 } 165 _value = sp; 166 } 167 } 168 } 169 170 PathString::PathString(const char* value) { 171 if (value == nullptr) { 172 _value = nullptr; 173 } else { 174 _value = AllocateHeap(strlen(value)+1, mtArguments); 175 strcpy(_value, value); 176 } 177 } 178 179 PathString::~PathString() { 180 if (_value != nullptr) { 181 FreeHeap(_value); 182 _value = nullptr; 183 } 184 } 185 186 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 187 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value"); 188 size_t len = strlen(module_name) + 1; 189 _module_name = AllocateHeap(len, mtInternal); 190 strncpy(_module_name, module_name, len); // copy the trailing null 191 _path = new PathString(path); 192 } 193 194 ModulePatchPath::~ModulePatchPath() { 195 if (_module_name != nullptr) { 196 FreeHeap(_module_name); 197 _module_name = nullptr; 198 } 199 if (_path != nullptr) { 200 delete _path; 201 _path = nullptr; 202 } 203 } 204 205 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 206 if (key == nullptr) { 207 _key = nullptr; 208 } else { 209 _key = AllocateHeap(strlen(key)+1, mtArguments); 210 strcpy(_key, key); 211 } 212 _next = nullptr; 213 _internal = internal; 214 _writeable = writeable; 215 } 216 217 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 218 // part of the option string. 219 static bool match_option(const JavaVMOption *option, const char* name, 220 const char** tail) { 221 size_t len = strlen(name); 222 if (strncmp(option->optionString, name, len) == 0) { 223 *tail = option->optionString + len; 224 return true; 225 } else { 226 return false; 227 } 228 } 229 230 // Check if 'option' matches 'name'. No "tail" is allowed. 231 static bool match_option(const JavaVMOption *option, const char* name) { 232 const char* tail = nullptr; 233 bool result = match_option(option, name, &tail); 234 if (tail != nullptr && *tail == '\0') { 235 return result; 236 } else { 237 return false; 238 } 239 } 240 241 // Return true if any of the strings in null-terminated array 'names' matches. 242 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 243 // the option must match exactly. 244 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 245 bool tail_allowed) { 246 for (/* empty */; *names != nullptr; ++names) { 247 if (match_option(option, *names, tail)) { 248 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 249 return true; 250 } 251 } 252 } 253 return false; 254 } 255 256 #if INCLUDE_JFR 257 static bool _has_jfr_option = false; // is using JFR 258 259 // return true on failure 260 static bool match_jfr_option(const JavaVMOption** option) { 261 assert((*option)->optionString != nullptr, "invariant"); 262 char* tail = nullptr; 263 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 264 _has_jfr_option = true; 265 return Jfr::on_start_flight_recording_option(option, tail); 266 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 267 _has_jfr_option = true; 268 return Jfr::on_flight_recorder_option(option, tail); 269 } 270 return false; 271 } 272 273 bool Arguments::has_jfr_option() { 274 return _has_jfr_option; 275 } 276 #endif 277 278 static void logOption(const char* opt) { 279 if (PrintVMOptions) { 280 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 281 } 282 } 283 284 bool needs_module_property_warning = false; 285 286 #define MODULE_PROPERTY_PREFIX "jdk.module." 287 #define MODULE_PROPERTY_PREFIX_LEN 11 288 #define ADDEXPORTS "addexports" 289 #define ADDEXPORTS_LEN 10 290 #define ADDREADS "addreads" 291 #define ADDREADS_LEN 8 292 #define ADDOPENS "addopens" 293 #define ADDOPENS_LEN 8 294 #define PATCH "patch" 295 #define PATCH_LEN 5 296 #define ADDMODS "addmods" 297 #define ADDMODS_LEN 7 298 #define LIMITMODS "limitmods" 299 #define LIMITMODS_LEN 9 300 #define PATH "path" 301 #define PATH_LEN 4 302 #define UPGRADE_PATH "upgrade.path" 303 #define UPGRADE_PATH_LEN 12 304 #define ENABLE_NATIVE_ACCESS "enable.native.access" 305 #define ENABLE_NATIVE_ACCESS_LEN 20 306 307 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 308 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 309 return ((strncmp(option, property, len) == 0) && 310 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 311 } 312 313 // Return true if property starts with "jdk.module." and its ensuing chars match 314 // any of the reserved module properties. 315 // property should be passed without the leading "-D". 316 bool Arguments::is_internal_module_property(const char* property) { 317 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 318 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 319 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 320 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 321 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 322 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 323 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 324 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 325 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 326 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 327 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 328 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 329 return true; 330 } 331 } 332 return false; 333 } 334 335 // Process java launcher properties. 336 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 337 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 338 // Must do this before setting up other system properties, 339 // as some of them may depend on launcher type. 340 for (int index = 0; index < args->nOptions; index++) { 341 const JavaVMOption* option = args->options + index; 342 const char* tail; 343 344 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 345 process_java_launcher_argument(tail, option->extraInfo); 346 continue; 347 } 348 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 349 if (strcmp(tail, "true") == 0) { 350 _sun_java_launcher_is_altjvm = true; 351 } 352 continue; 353 } 354 } 355 } 356 357 // Initialize system properties key and value. 358 void Arguments::init_system_properties() { 359 360 // Set up _boot_class_path which is not a property but 361 // relies heavily on argument processing and the jdk.boot.class.path.append 362 // property. It is used to store the underlying boot class path. 363 _boot_class_path = new PathString(nullptr); 364 365 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 366 "Java Virtual Machine Specification", false)); 367 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 369 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 370 371 // Initialize the vm.info now, but it will need updating after argument parsing. 372 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 373 374 // Following are JVMTI agent writable properties. 375 // Properties values are set to nullptr and they are 376 // os specific they are initialized in os::init_system_properties_values(). 377 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true); 378 _java_library_path = new SystemProperty("java.library.path", nullptr, true); 379 _java_home = new SystemProperty("java.home", nullptr, true); 380 _java_class_path = new SystemProperty("java.class.path", "", true); 381 // jdk.boot.class.path.append is a non-writeable, internal property. 382 // It can only be set by either: 383 // - -Xbootclasspath/a: 384 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 385 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true); 386 387 // Add to System Property list. 388 PropertyList_add(&_system_properties, _sun_boot_library_path); 389 PropertyList_add(&_system_properties, _java_library_path); 390 PropertyList_add(&_system_properties, _java_home); 391 PropertyList_add(&_system_properties, _java_class_path); 392 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 393 PropertyList_add(&_system_properties, _vm_info); 394 395 // Set OS specific system properties values 396 os::init_system_properties_values(); 397 } 398 399 // Update/Initialize System properties after JDK version number is known 400 void Arguments::init_version_specific_system_properties() { 401 enum { bufsz = 16 }; 402 char buffer[bufsz]; 403 const char* spec_vendor = "Oracle Corporation"; 404 uint32_t spec_version = JDK_Version::current().major_version(); 405 406 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 407 408 PropertyList_add(&_system_properties, 409 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 410 PropertyList_add(&_system_properties, 411 new SystemProperty("java.vm.specification.version", buffer, false)); 412 PropertyList_add(&_system_properties, 413 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 414 } 415 416 /* 417 * -XX argument processing: 418 * 419 * -XX arguments are defined in several places, such as: 420 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 421 * -XX arguments are parsed in parse_argument(). 422 * -XX argument bounds checking is done in check_vm_args_consistency(). 423 * 424 * Over time -XX arguments may change. There are mechanisms to handle common cases: 425 * 426 * ALIASED: An option that is simply another name for another option. This is often 427 * part of the process of deprecating a flag, but not all aliases need 428 * to be deprecated. 429 * 430 * Create an alias for an option by adding the old and new option names to the 431 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 432 * 433 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 434 * support may be removed in the future. Both regular and aliased options may be 435 * deprecated. 436 * 437 * Add a deprecation warning for an option (or alias) by adding an entry in the 438 * "special_jvm_flags" table and setting the "deprecated_in" field. 439 * Often an option "deprecated" in one major release will 440 * be made "obsolete" in the next. In this case the entry should also have its 441 * "obsolete_in" field set. 442 * 443 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 444 * on the command line. A warning is printed to let the user know that option might not 445 * be accepted in the future. 446 * 447 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 448 * table and setting the "obsolete_in" field. 449 * 450 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 451 * to the current JDK version. The system will flatly refuse to admit the existence of 452 * the flag. This allows a flag to die automatically over JDK releases. 453 * 454 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 455 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 456 * - Newly obsolete or expired deprecated options should have their global variable 457 * definitions removed (from globals.hpp, etc) and related implementations removed. 458 * 459 * Recommended approach for removing options: 460 * 461 * To remove options commonly used by customers (e.g. product -XX options), use 462 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 463 * 464 * To remove internal options (e.g. diagnostic, experimental, develop options), use 465 * a 2-step model adding major release numbers to the obsolete and expire columns. 466 * 467 * To change the name of an option, use the alias table as well as a 2-step 468 * model adding major release numbers to the deprecate and expire columns. 469 * Think twice about aliasing commonly used customer options. 470 * 471 * There are times when it is appropriate to leave a future release number as undefined. 472 * 473 * Tests: Aliases should be tested in VMAliasOptions.java. 474 * Deprecated options should be tested in VMDeprecatedOptions.java. 475 */ 476 477 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 478 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 479 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 480 // the command-line as usual, but will issue a warning. 481 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 482 // the command-line, while issuing a warning and ignoring the flag value. 483 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 484 // existence of the flag. 485 // 486 // MANUAL CLEANUP ON JDK VERSION UPDATES: 487 // This table ensures that the handling of options will update automatically when the JDK 488 // version is incremented, but the source code needs to be cleanup up manually: 489 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 490 // variable should be removed, as well as users of the variable. 491 // - As "deprecated" options age into "obsolete" options, move the entry into the 492 // "Obsolete Flags" section of the table. 493 // - All expired options should be removed from the table. 494 static SpecialFlag const special_jvm_flags[] = { 495 // -------------- Deprecated Flags -------------- 496 // --- Non-alias flags - sorted by obsolete_in then expired_in: 497 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 498 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 499 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 500 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 501 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 502 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 503 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 504 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 505 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 506 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 507 508 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 509 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 510 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 511 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 512 513 // -------------- Obsolete Flags - sorted by expired_in -------------- 514 515 { "EnableWaitForParallelLoad", JDK_Version::jdk(20), JDK_Version::jdk(21), JDK_Version::jdk(22) }, 516 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 517 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 518 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 519 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 520 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 521 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 522 523 { "G1UsePreventiveGC", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::jdk(22) }, 524 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 525 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 526 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 527 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 528 529 #ifdef ASSERT 530 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 531 #endif 532 533 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 534 // These entries will generate build errors. Their purpose is to test the macros. 535 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 536 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 537 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 538 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 539 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 540 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 541 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 542 #endif 543 544 { nullptr, JDK_Version(0), JDK_Version(0) } 545 }; 546 547 // Flags that are aliases for other flags. 548 typedef struct { 549 const char* alias_name; 550 const char* real_name; 551 } AliasedFlag; 552 553 static AliasedFlag const aliased_jvm_flags[] = { 554 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 555 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 556 { nullptr, nullptr} 557 }; 558 559 // Return true if "v" is less than "other", where "other" may be "undefined". 560 static bool version_less_than(JDK_Version v, JDK_Version other) { 561 assert(!v.is_undefined(), "must be defined"); 562 if (!other.is_undefined() && v.compare(other) >= 0) { 563 return false; 564 } else { 565 return true; 566 } 567 } 568 569 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 570 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 571 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 572 flag = special_jvm_flags[i]; 573 return true; 574 } 575 } 576 return false; 577 } 578 579 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 580 assert(version != nullptr, "Must provide a version buffer"); 581 SpecialFlag flag; 582 if (lookup_special_flag(flag_name, flag)) { 583 if (!flag.obsolete_in.is_undefined()) { 584 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 585 *version = flag.obsolete_in; 586 // This flag may have been marked for obsoletion in this version, but we may not 587 // have actually removed it yet. Rather than ignoring it as soon as we reach 588 // this version we allow some time for the removal to happen. So if the flag 589 // still actually exists we process it as normal, but issue an adjusted warning. 590 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 591 if (real_flag != nullptr) { 592 char version_str[256]; 593 version->to_string(version_str, sizeof(version_str)); 594 warning("Temporarily processing option %s; support is scheduled for removal in %s", 595 flag_name, version_str); 596 return false; 597 } 598 return true; 599 } 600 } 601 } 602 return false; 603 } 604 605 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 606 assert(version != nullptr, "Must provide a version buffer"); 607 SpecialFlag flag; 608 if (lookup_special_flag(flag_name, flag)) { 609 if (!flag.deprecated_in.is_undefined()) { 610 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 611 version_less_than(JDK_Version::current(), flag.expired_in)) { 612 *version = flag.deprecated_in; 613 return 1; 614 } else { 615 return -1; 616 } 617 } 618 } 619 return 0; 620 } 621 622 const char* Arguments::real_flag_name(const char *flag_name) { 623 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) { 624 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 625 if (strcmp(flag_status.alias_name, flag_name) == 0) { 626 return flag_status.real_name; 627 } 628 } 629 return flag_name; 630 } 631 632 #ifdef ASSERT 633 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 634 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 635 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 636 return true; 637 } 638 } 639 return false; 640 } 641 642 // Verifies the correctness of the entries in the special_jvm_flags table. 643 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 644 // version being earlier than the deprecation version, then a warning is issued 645 // and verification fails - by returning false. If it is detected that the table 646 // is out of date, with respect to the current version, then ideally a warning is 647 // issued but verification does not fail. This allows the VM to operate when the 648 // version is first updated, without needing to update all the impacted flags at 649 // the same time. In practice we can't issue the warning immediately when the version 650 // is updated as it occurs for every test and some tests are not prepared to handle 651 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 652 // if the check_globals flag is true, and in addition allow a grace period and only 653 // check for stale flags when we hit build 25 (which is far enough into the 6 month 654 // release cycle that all flag updates should have been processed, whilst still 655 // leaving time to make the change before RDP2). 656 // We use a gtest to call this, passing true, so that we can detect stale flags before 657 // the end of the release cycle. 658 659 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 660 661 bool Arguments::verify_special_jvm_flags(bool check_globals) { 662 bool success = true; 663 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 664 const SpecialFlag& flag = special_jvm_flags[i]; 665 if (lookup_special_flag(flag.name, i)) { 666 warning("Duplicate special flag declaration \"%s\"", flag.name); 667 success = false; 668 } 669 if (flag.deprecated_in.is_undefined() && 670 flag.obsolete_in.is_undefined()) { 671 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 672 success = false; 673 } 674 675 if (!flag.deprecated_in.is_undefined()) { 676 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 677 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 678 success = false; 679 } 680 681 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 682 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 683 success = false; 684 } 685 } 686 687 if (!flag.obsolete_in.is_undefined()) { 688 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 689 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 690 success = false; 691 } 692 693 // if flag has become obsolete it should not have a "globals" flag defined anymore. 694 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 695 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 696 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 697 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 698 success = false; 699 } 700 } 701 702 } else if (!flag.expired_in.is_undefined()) { 703 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 704 success = false; 705 } 706 707 if (!flag.expired_in.is_undefined()) { 708 // if flag has become expired it should not have a "globals" flag defined anymore. 709 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 710 !version_less_than(JDK_Version::current(), flag.expired_in)) { 711 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 712 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 713 success = false; 714 } 715 } 716 } 717 } 718 return success; 719 } 720 #endif 721 722 bool Arguments::atojulong(const char *s, julong* result) { 723 return parse_integer(s, result); 724 } 725 726 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 727 if (size < min_size) return arg_too_small; 728 if (size > max_size) return arg_too_big; 729 return arg_in_range; 730 } 731 732 // Describe an argument out of range error 733 void Arguments::describe_range_error(ArgsRange errcode) { 734 switch(errcode) { 735 case arg_too_big: 736 jio_fprintf(defaultStream::error_stream(), 737 "The specified size exceeds the maximum " 738 "representable size.\n"); 739 break; 740 case arg_too_small: 741 case arg_unreadable: 742 case arg_in_range: 743 // do nothing for now 744 break; 745 default: 746 ShouldNotReachHere(); 747 } 748 } 749 750 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 751 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 752 return true; 753 } else { 754 return false; 755 } 756 } 757 758 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 759 // strtod allows leading whitespace, but our flag format does not. 760 if (*value == '\0' || isspace(*value)) { 761 return false; 762 } 763 char* end; 764 errno = 0; 765 double v = strtod(value, &end); 766 if ((errno != 0) || (*end != 0)) { 767 return false; 768 } 769 if (g_isnan(v) || !g_isfinite(v)) { 770 // Currently we cannot handle these special values. 771 return false; 772 } 773 774 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 775 return true; 776 } 777 return false; 778 } 779 780 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 781 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 782 783 if (flag->is_int()) { 784 int v; 785 if (parse_integer(value, &v)) { 786 result = JVMFlagAccess::set_int(flag, &v, origin); 787 } 788 } else if (flag->is_uint()) { 789 uint v; 790 if (parse_integer(value, &v)) { 791 result = JVMFlagAccess::set_uint(flag, &v, origin); 792 } 793 } else if (flag->is_intx()) { 794 intx v; 795 if (parse_integer(value, &v)) { 796 result = JVMFlagAccess::set_intx(flag, &v, origin); 797 } 798 } else if (flag->is_uintx()) { 799 uintx v; 800 if (parse_integer(value, &v)) { 801 result = JVMFlagAccess::set_uintx(flag, &v, origin); 802 } 803 } else if (flag->is_uint64_t()) { 804 uint64_t v; 805 if (parse_integer(value, &v)) { 806 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 807 } 808 } else if (flag->is_size_t()) { 809 size_t v; 810 if (parse_integer(value, &v)) { 811 result = JVMFlagAccess::set_size_t(flag, &v, origin); 812 } 813 } 814 815 return result == JVMFlag::SUCCESS; 816 } 817 818 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 819 if (value[0] == '\0') { 820 value = nullptr; 821 } 822 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 823 // Contract: JVMFlag always returns a pointer that needs freeing. 824 FREE_C_HEAP_ARRAY(char, value); 825 return true; 826 } 827 828 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 829 const char* old_value = ""; 830 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 831 size_t old_len = old_value != nullptr ? strlen(old_value) : 0; 832 size_t new_len = strlen(new_value); 833 const char* value; 834 char* free_this_too = nullptr; 835 if (old_len == 0) { 836 value = new_value; 837 } else if (new_len == 0) { 838 value = old_value; 839 } else { 840 size_t length = old_len + 1 + new_len + 1; 841 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 842 // each new setting adds another LINE to the switch: 843 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 844 value = buf; 845 free_this_too = buf; 846 } 847 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 848 // JVMFlag always returns a pointer that needs freeing. 849 FREE_C_HEAP_ARRAY(char, value); 850 // JVMFlag made its own copy, so I must delete my own temp. buffer. 851 FREE_C_HEAP_ARRAY(char, free_this_too); 852 return true; 853 } 854 855 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 856 const char* real_name = real_flag_name(arg); 857 JDK_Version since = JDK_Version(); 858 switch (is_deprecated_flag(arg, &since)) { 859 case -1: { 860 // Obsolete or expired, so don't process normally, 861 // but allow for an obsolete flag we're still 862 // temporarily allowing. 863 if (!is_obsolete_flag(arg, &since)) { 864 return real_name; 865 } 866 // Note if we're not considered obsolete then we can't be expired either 867 // as obsoletion must come first. 868 return nullptr; 869 } 870 case 0: 871 return real_name; 872 case 1: { 873 char version[256]; 874 since.to_string(version, sizeof(version)); 875 if (real_name != arg) { 876 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 877 arg, version, real_name); 878 } else { 879 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 880 arg, version); 881 } 882 return real_name; 883 } 884 } 885 ShouldNotReachHere(); 886 return nullptr; 887 } 888 889 #define BUFLEN 255 890 891 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 892 char name_copied[BUFLEN+1]; 893 if (name[name_length] != 0) { 894 if (name_length > BUFLEN) { 895 return nullptr; 896 } else { 897 strncpy(name_copied, name, name_length); 898 name_copied[name_length] = '\0'; 899 name = name_copied; 900 } 901 } 902 903 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 904 if (real_name == nullptr) { 905 return nullptr; 906 } 907 JVMFlag* flag = JVMFlag::find_flag(real_name); 908 return flag; 909 } 910 911 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 912 bool is_bool = false; 913 bool bool_val = false; 914 char c = *arg; 915 if (c == '+' || c == '-') { 916 is_bool = true; 917 bool_val = (c == '+'); 918 arg++; 919 } 920 921 const char* name = arg; 922 while (true) { 923 c = *arg; 924 if (isalnum(c) || (c == '_')) { 925 ++arg; 926 } else { 927 break; 928 } 929 } 930 931 size_t name_len = size_t(arg - name); 932 if (name_len == 0) { 933 return false; 934 } 935 936 JVMFlag* flag = find_jvm_flag(name, name_len); 937 if (flag == nullptr) { 938 return false; 939 } 940 941 if (is_bool) { 942 if (*arg != 0) { 943 // Error -- extra characters such as -XX:+BoolFlag=123 944 return false; 945 } 946 return set_bool_flag(flag, bool_val, origin); 947 } 948 949 if (arg[0] == '=') { 950 const char* value = arg + 1; 951 if (flag->is_ccstr()) { 952 if (flag->ccstr_accumulates()) { 953 return append_to_string_flag(flag, value, origin); 954 } else { 955 return set_string_flag(flag, value, origin); 956 } 957 } else if (flag->is_double()) { 958 return set_fp_numeric_flag(flag, value, origin); 959 } else { 960 return set_numeric_flag(flag, value, origin); 961 } 962 } 963 964 if (arg[0] == ':' && arg[1] == '=') { 965 // -XX:Foo:=xxx will reset the string flag to the given value. 966 const char* value = arg + 2; 967 return set_string_flag(flag, value, origin); 968 } 969 970 return false; 971 } 972 973 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 974 assert(bldarray != nullptr, "illegal argument"); 975 976 if (arg == nullptr) { 977 return; 978 } 979 980 int new_count = *count + 1; 981 982 // expand the array and add arg to the last element 983 if (*bldarray == nullptr) { 984 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 985 } else { 986 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 987 } 988 (*bldarray)[*count] = os::strdup_check_oom(arg); 989 *count = new_count; 990 } 991 992 void Arguments::build_jvm_args(const char* arg) { 993 add_string(&_jvm_args_array, &_num_jvm_args, arg); 994 } 995 996 void Arguments::build_jvm_flags(const char* arg) { 997 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 998 } 999 1000 // utility function to return a string that concatenates all 1001 // strings in a given char** array 1002 const char* Arguments::build_resource_string(char** args, int count) { 1003 if (args == nullptr || count == 0) { 1004 return nullptr; 1005 } 1006 size_t length = 0; 1007 for (int i = 0; i < count; i++) { 1008 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character 1009 } 1010 char* s = NEW_RESOURCE_ARRAY(char, length); 1011 char* dst = s; 1012 for (int j = 0; j < count; j++) { 1013 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character 1014 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character 1015 dst += offset; 1016 length -= offset; 1017 } 1018 return (const char*) s; 1019 } 1020 1021 void Arguments::print_on(outputStream* st) { 1022 st->print_cr("VM Arguments:"); 1023 if (num_jvm_flags() > 0) { 1024 st->print("jvm_flags: "); print_jvm_flags_on(st); 1025 st->cr(); 1026 } 1027 if (num_jvm_args() > 0) { 1028 st->print("jvm_args: "); print_jvm_args_on(st); 1029 st->cr(); 1030 } 1031 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1032 if (_java_class_path != nullptr) { 1033 char* path = _java_class_path->value(); 1034 size_t len = strlen(path); 1035 st->print("java_class_path (initial): "); 1036 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1037 if (len == 0) { 1038 st->print_raw_cr("<not set>"); 1039 } else { 1040 st->print_raw_cr(path, len); 1041 } 1042 } 1043 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1044 } 1045 1046 void Arguments::print_summary_on(outputStream* st) { 1047 // Print the command line. Environment variables that are helpful for 1048 // reproducing the problem are written later in the hs_err file. 1049 // flags are from setting file 1050 if (num_jvm_flags() > 0) { 1051 st->print_raw("Settings File: "); 1052 print_jvm_flags_on(st); 1053 st->cr(); 1054 } 1055 // args are the command line and environment variable arguments. 1056 st->print_raw("Command Line: "); 1057 if (num_jvm_args() > 0) { 1058 print_jvm_args_on(st); 1059 } 1060 // this is the classfile and any arguments to the java program 1061 if (java_command() != nullptr) { 1062 st->print("%s", java_command()); 1063 } 1064 st->cr(); 1065 } 1066 1067 void Arguments::print_jvm_flags_on(outputStream* st) { 1068 if (_num_jvm_flags > 0) { 1069 for (int i=0; i < _num_jvm_flags; i++) { 1070 st->print("%s ", _jvm_flags_array[i]); 1071 } 1072 } 1073 } 1074 1075 void Arguments::print_jvm_args_on(outputStream* st) { 1076 if (_num_jvm_args > 0) { 1077 for (int i=0; i < _num_jvm_args; i++) { 1078 st->print("%s ", _jvm_args_array[i]); 1079 } 1080 } 1081 } 1082 1083 bool Arguments::process_argument(const char* arg, 1084 jboolean ignore_unrecognized, 1085 JVMFlagOrigin origin) { 1086 JDK_Version since = JDK_Version(); 1087 1088 if (parse_argument(arg, origin)) { 1089 return true; 1090 } 1091 1092 // Determine if the flag has '+', '-', or '=' characters. 1093 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1094 const char* const argname = has_plus_minus ? arg + 1 : arg; 1095 1096 size_t arg_len; 1097 const char* equal_sign = strchr(argname, '='); 1098 if (equal_sign == nullptr) { 1099 arg_len = strlen(argname); 1100 } else { 1101 arg_len = equal_sign - argname; 1102 } 1103 1104 // Only make the obsolete check for valid arguments. 1105 if (arg_len <= BUFLEN) { 1106 // Construct a string which consists only of the argument name without '+', '-', or '='. 1107 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1108 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1109 if (is_obsolete_flag(stripped_argname, &since)) { 1110 char version[256]; 1111 since.to_string(version, sizeof(version)); 1112 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1113 return true; 1114 } 1115 } 1116 1117 // For locked flags, report a custom error message if available. 1118 // Otherwise, report the standard unrecognized VM option. 1119 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1120 if (found_flag != nullptr) { 1121 char locked_message_buf[BUFLEN]; 1122 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1123 if (strlen(locked_message_buf) == 0) { 1124 if (found_flag->is_bool() && !has_plus_minus) { 1125 jio_fprintf(defaultStream::error_stream(), 1126 "Missing +/- setting for VM option '%s'\n", argname); 1127 } else if (!found_flag->is_bool() && has_plus_minus) { 1128 jio_fprintf(defaultStream::error_stream(), 1129 "Unexpected +/- setting in VM option '%s'\n", argname); 1130 } else { 1131 jio_fprintf(defaultStream::error_stream(), 1132 "Improperly specified VM option '%s'\n", argname); 1133 } 1134 } else { 1135 #ifdef PRODUCT 1136 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1137 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1138 if (ignore_unrecognized && mismatched) { 1139 return true; 1140 } 1141 #endif 1142 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1143 } 1144 } else { 1145 if (ignore_unrecognized) { 1146 return true; 1147 } 1148 jio_fprintf(defaultStream::error_stream(), 1149 "Unrecognized VM option '%s'\n", argname); 1150 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1151 if (fuzzy_matched != nullptr) { 1152 jio_fprintf(defaultStream::error_stream(), 1153 "Did you mean '%s%s%s'? ", 1154 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1155 fuzzy_matched->name(), 1156 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1157 } 1158 } 1159 1160 // allow for commandline "commenting out" options like -XX:#+Verbose 1161 return arg[0] == '#'; 1162 } 1163 1164 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1165 FILE* stream = os::fopen(file_name, "rb"); 1166 if (stream == nullptr) { 1167 if (should_exist) { 1168 jio_fprintf(defaultStream::error_stream(), 1169 "Could not open settings file %s\n", file_name); 1170 return false; 1171 } else { 1172 return true; 1173 } 1174 } 1175 1176 char token[1024]; 1177 int pos = 0; 1178 1179 bool in_white_space = true; 1180 bool in_comment = false; 1181 bool in_quote = false; 1182 char quote_c = 0; 1183 bool result = true; 1184 1185 int c = getc(stream); 1186 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1187 if (in_white_space) { 1188 if (in_comment) { 1189 if (c == '\n') in_comment = false; 1190 } else { 1191 if (c == '#') in_comment = true; 1192 else if (!isspace(c)) { 1193 in_white_space = false; 1194 token[pos++] = c; 1195 } 1196 } 1197 } else { 1198 if (c == '\n' || (!in_quote && isspace(c))) { 1199 // token ends at newline, or at unquoted whitespace 1200 // this allows a way to include spaces in string-valued options 1201 token[pos] = '\0'; 1202 logOption(token); 1203 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1204 build_jvm_flags(token); 1205 pos = 0; 1206 in_white_space = true; 1207 in_quote = false; 1208 } else if (!in_quote && (c == '\'' || c == '"')) { 1209 in_quote = true; 1210 quote_c = c; 1211 } else if (in_quote && (c == quote_c)) { 1212 in_quote = false; 1213 } else { 1214 token[pos++] = c; 1215 } 1216 } 1217 c = getc(stream); 1218 } 1219 if (pos > 0) { 1220 token[pos] = '\0'; 1221 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1222 build_jvm_flags(token); 1223 } 1224 fclose(stream); 1225 return result; 1226 } 1227 1228 //============================================================================================================= 1229 // Parsing of properties (-D) 1230 1231 const char* Arguments::get_property(const char* key) { 1232 return PropertyList_get_value(system_properties(), key); 1233 } 1234 1235 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1236 const char* eq = strchr(prop, '='); 1237 const char* key; 1238 const char* value = ""; 1239 1240 if (eq == nullptr) { 1241 // property doesn't have a value, thus use passed string 1242 key = prop; 1243 } else { 1244 // property have a value, thus extract it and save to the 1245 // allocated string 1246 size_t key_len = eq - prop; 1247 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1248 1249 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1250 key = tmp_key; 1251 1252 value = &prop[key_len + 1]; 1253 } 1254 1255 #if INCLUDE_CDS 1256 if (is_internal_module_property(key) || 1257 strcmp(key, "jdk.module.main") == 0) { 1258 MetaspaceShared::disable_optimized_module_handling(); 1259 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value); 1260 } 1261 if (strcmp(key, "jdk.module.showModuleResolution") == 0 || 1262 strcmp(key, "jdk.module.validation") == 0 || 1263 strcmp(key, "java.system.class.loader") == 0) { 1264 MetaspaceShared::disable_full_module_graph(); 1265 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value); 1266 } 1267 #endif 1268 1269 if (strcmp(key, "java.compiler") == 0) { 1270 // we no longer support java.compiler system property, log a warning and let it get 1271 // passed to Java, like any other system property 1272 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) { 1273 // for applications using NONE or empty value, log a more informative message 1274 warning("The java.compiler system property is obsolete and no longer supported, use -Xint"); 1275 } else { 1276 warning("The java.compiler system property is obsolete and no longer supported."); 1277 } 1278 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1279 // sun.java.launcher.is_altjvm property is 1280 // private and is processed in process_sun_java_launcher_properties(); 1281 // the sun.java.launcher property is passed on to the java application 1282 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1283 // append is true, writable is true, internal is false 1284 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1285 WriteableProperty, ExternalProperty); 1286 } else { 1287 if (strcmp(key, "sun.java.command") == 0) { 1288 char *old_java_command = _java_command; 1289 _java_command = os::strdup_check_oom(value, mtArguments); 1290 if (old_java_command != nullptr) { 1291 os::free(old_java_command); 1292 } 1293 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1294 // If this property is set on the command line then its value will be 1295 // displayed in VM error logs as the URL at which to submit such logs. 1296 // Normally the URL displayed in error logs is different from the value 1297 // of this system property, so a different property should have been 1298 // used here, but we leave this as-is in case someone depends upon it. 1299 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1300 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1301 // its value without going through the property list or making a Java call. 1302 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1303 if (old_java_vendor_url_bug != nullptr) { 1304 os::free((void *)old_java_vendor_url_bug); 1305 } 1306 } 1307 1308 // Create new property and add at the end of the list 1309 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1310 } 1311 1312 if (key != prop) { 1313 // SystemProperty copy passed value, thus free previously allocated 1314 // memory 1315 FreeHeap((void *)key); 1316 } 1317 1318 return true; 1319 } 1320 1321 #if INCLUDE_CDS 1322 const char* unsupported_properties[] = { "jdk.module.limitmods", 1323 "jdk.module.upgrade.path", 1324 "jdk.module.patch.0" }; 1325 const char* unsupported_options[] = { "--limit-modules", 1326 "--upgrade-module-path", 1327 "--patch-module" 1328 }; 1329 void Arguments::check_unsupported_dumping_properties() { 1330 assert(is_dumping_archive(), 1331 "this function is only used with CDS dump time"); 1332 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1333 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1334 SystemProperty* sp = system_properties(); 1335 while (sp != nullptr) { 1336 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1337 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1338 vm_exit_during_initialization( 1339 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1340 } 1341 } 1342 sp = sp->next(); 1343 } 1344 1345 // Check for an exploded module build in use with -Xshare:dump. 1346 if (!has_jimage()) { 1347 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1348 } 1349 } 1350 1351 bool Arguments::check_unsupported_cds_runtime_properties() { 1352 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1353 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1354 if (ArchiveClassesAtExit != nullptr) { 1355 // dynamic dumping, just return false for now. 1356 // check_unsupported_dumping_properties() will be called later to check the same set of 1357 // properties, and will exit the VM with the correct error message if the unsupported properties 1358 // are used. 1359 return false; 1360 } 1361 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1362 if (get_property(unsupported_properties[i]) != nullptr) { 1363 if (RequireSharedSpaces) { 1364 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1365 } else { 1366 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1367 } 1368 return true; 1369 } 1370 } 1371 return false; 1372 } 1373 #endif 1374 1375 //=========================================================================================================== 1376 // Setting int/mixed/comp mode flags 1377 1378 void Arguments::set_mode_flags(Mode mode) { 1379 // Set up default values for all flags. 1380 // If you add a flag to any of the branches below, 1381 // add a default value for it here. 1382 _mode = mode; 1383 1384 // Ensure Agent_OnLoad has the correct initial values. 1385 // This may not be the final mode; mode may change later in onload phase. 1386 PropertyList_unique_add(&_system_properties, "java.vm.info", 1387 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1388 1389 UseInterpreter = true; 1390 UseCompiler = true; 1391 UseLoopCounter = true; 1392 1393 // Default values may be platform/compiler dependent - 1394 // use the saved values 1395 ClipInlining = Arguments::_ClipInlining; 1396 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1397 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1398 BackgroundCompilation = Arguments::_BackgroundCompilation; 1399 1400 // Change from defaults based on mode 1401 switch (mode) { 1402 default: 1403 ShouldNotReachHere(); 1404 break; 1405 case _int: 1406 UseCompiler = false; 1407 UseLoopCounter = false; 1408 AlwaysCompileLoopMethods = false; 1409 UseOnStackReplacement = false; 1410 break; 1411 case _mixed: 1412 // same as default 1413 break; 1414 case _comp: 1415 UseInterpreter = false; 1416 BackgroundCompilation = false; 1417 ClipInlining = false; 1418 break; 1419 } 1420 } 1421 1422 // Conflict: required to use shared spaces (-Xshare:on), but 1423 // incompatible command line options were chosen. 1424 static void no_shared_spaces(const char* message) { 1425 if (RequireSharedSpaces) { 1426 jio_fprintf(defaultStream::error_stream(), 1427 "Class data sharing is inconsistent with other specified options.\n"); 1428 vm_exit_during_initialization("Unable to use shared archive", message); 1429 } else { 1430 log_info(cds)("Unable to use shared archive: %s", message); 1431 UseSharedSpaces = false; 1432 } 1433 } 1434 1435 void set_object_alignment() { 1436 // Object alignment. 1437 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1438 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1439 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1440 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1441 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1442 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1443 1444 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1445 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1446 1447 // Oop encoding heap max 1448 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1449 } 1450 1451 size_t Arguments::max_heap_for_compressed_oops() { 1452 // Avoid sign flip. 1453 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1454 // We need to fit both the null page and the heap into the memory budget, while 1455 // keeping alignment constraints of the heap. To guarantee the latter, as the 1456 // null page is located before the heap, we pad the null page to the conservative 1457 // maximum alignment that the GC may ever impose upon the heap. 1458 size_t displacement_due_to_null_page = align_up(os::vm_page_size(), 1459 _conservative_max_heap_alignment); 1460 1461 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1462 NOT_LP64(ShouldNotReachHere(); return 0); 1463 } 1464 1465 void Arguments::set_use_compressed_oops() { 1466 #ifdef _LP64 1467 // MaxHeapSize is not set up properly at this point, but 1468 // the only value that can override MaxHeapSize if we are 1469 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1470 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1471 1472 if (max_heap_size <= max_heap_for_compressed_oops()) { 1473 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1474 FLAG_SET_ERGO(UseCompressedOops, true); 1475 } 1476 } else { 1477 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1478 warning("Max heap size too large for Compressed Oops"); 1479 FLAG_SET_DEFAULT(UseCompressedOops, false); 1480 } 1481 } 1482 #endif // _LP64 1483 } 1484 1485 1486 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1487 // set_use_compressed_oops(). 1488 void Arguments::set_use_compressed_klass_ptrs() { 1489 #ifdef _LP64 1490 // On some architectures, the use of UseCompressedClassPointers implies the use of 1491 // UseCompressedOops. The reason is that the rheap_base register of said platforms 1492 // is reused to perform some optimized spilling, in order to use rheap_base as a 1493 // temp register. But by treating it as any other temp register, spilling can typically 1494 // be completely avoided instead. So it is better not to perform this trick. And by 1495 // not having that reliance, large heaps, or heaps not supporting compressed oops, 1496 // can still use compressed class pointers. 1497 // Turn on UseCompressedClassPointers too 1498 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1499 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1500 } 1501 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1502 if (UseCompressedClassPointers) { 1503 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1504 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1505 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1506 } 1507 } 1508 #endif // _LP64 1509 } 1510 1511 void Arguments::set_conservative_max_heap_alignment() { 1512 // The conservative maximum required alignment for the heap is the maximum of 1513 // the alignments imposed by several sources: any requirements from the heap 1514 // itself and the maximum page size we may run the VM with. 1515 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1516 _conservative_max_heap_alignment = MAX4(heap_alignment, 1517 os::vm_allocation_granularity(), 1518 os::max_page_size(), 1519 GCArguments::compute_heap_alignment()); 1520 } 1521 1522 jint Arguments::set_ergonomics_flags() { 1523 GCConfig::initialize(); 1524 1525 set_conservative_max_heap_alignment(); 1526 1527 #ifdef _LP64 1528 set_use_compressed_oops(); 1529 1530 // set_use_compressed_klass_ptrs() must be called after calling 1531 // set_use_compressed_oops(). 1532 set_use_compressed_klass_ptrs(); 1533 1534 // Also checks that certain machines are slower with compressed oops 1535 // in vm_version initialization code. 1536 #endif // _LP64 1537 1538 return JNI_OK; 1539 } 1540 1541 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1542 size_t max_allocatable; 1543 size_t result = limit; 1544 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1545 // The AggressiveHeap check is a temporary workaround to avoid calling 1546 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1547 // selected. This works because AggressiveHeap implies UseParallelGC 1548 // where we know the ratio will be 1. Once the AggressiveHeap option is 1549 // removed, this can be cleaned up. 1550 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1551 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1552 result = MIN2(result, max_allocatable / fraction); 1553 } 1554 return result; 1555 } 1556 1557 // Use static initialization to get the default before parsing 1558 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1559 1560 void Arguments::set_heap_size() { 1561 julong phys_mem; 1562 1563 // If the user specified one of these options, they 1564 // want specific memory sizing so do not limit memory 1565 // based on compressed oops addressability. 1566 // Also, memory limits will be calculated based on 1567 // available os physical memory, not our MaxRAM limit, 1568 // unless MaxRAM is also specified. 1569 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1570 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1571 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1572 !FLAG_IS_DEFAULT(MinRAMFraction) || 1573 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1574 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1575 !FLAG_IS_DEFAULT(MaxRAM)); 1576 if (override_coop_limit) { 1577 if (FLAG_IS_DEFAULT(MaxRAM)) { 1578 phys_mem = os::physical_memory(); 1579 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1580 } else { 1581 phys_mem = (julong)MaxRAM; 1582 } 1583 } else { 1584 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1585 : (julong)MaxRAM; 1586 } 1587 1588 1589 // Convert deprecated flags 1590 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1591 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1592 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1593 1594 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1595 !FLAG_IS_DEFAULT(MinRAMFraction)) 1596 MinRAMPercentage = 100.0 / MinRAMFraction; 1597 1598 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1599 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1600 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1601 1602 // If the maximum heap size has not been set with -Xmx, 1603 // then set it as fraction of the size of physical memory, 1604 // respecting the maximum and minimum sizes of the heap. 1605 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1606 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1607 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1608 if (reasonable_min < MaxHeapSize) { 1609 // Small physical memory, so use a minimum fraction of it for the heap 1610 reasonable_max = reasonable_min; 1611 } else { 1612 // Not-small physical memory, so require a heap at least 1613 // as large as MaxHeapSize 1614 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1615 } 1616 1617 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1618 // Limit the heap size to ErgoHeapSizeLimit 1619 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1620 } 1621 1622 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1623 1624 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1625 // An initial heap size was specified on the command line, 1626 // so be sure that the maximum size is consistent. Done 1627 // after call to limit_heap_by_allocatable_memory because that 1628 // method might reduce the allocation size. 1629 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1630 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1631 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1632 } 1633 1634 #ifdef _LP64 1635 if (UseCompressedOops || UseCompressedClassPointers) { 1636 // HeapBaseMinAddress can be greater than default but not less than. 1637 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1638 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1639 // matches compressed oops printing flags 1640 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1641 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1642 DefaultHeapBaseMinAddress, 1643 DefaultHeapBaseMinAddress/G, 1644 HeapBaseMinAddress); 1645 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1646 } 1647 } 1648 } 1649 if (UseCompressedOops) { 1650 // Limit the heap size to the maximum possible when using compressed oops 1651 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1652 1653 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1654 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1655 // but it should be not less than default MaxHeapSize. 1656 max_coop_heap -= HeapBaseMinAddress; 1657 } 1658 1659 // If user specified flags prioritizing os physical 1660 // memory limits, then disable compressed oops if 1661 // limits exceed max_coop_heap and UseCompressedOops 1662 // was not specified. 1663 if (reasonable_max > max_coop_heap) { 1664 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1665 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1666 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1667 "Please check the setting of MaxRAMPercentage %5.2f." 1668 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1669 FLAG_SET_ERGO(UseCompressedOops, false); 1670 } else { 1671 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1672 } 1673 } 1674 } 1675 #endif // _LP64 1676 1677 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1678 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1679 } 1680 1681 // If the minimum or initial heap_size have not been set or requested to be set 1682 // ergonomically, set them accordingly. 1683 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1684 julong reasonable_minimum = (julong)(OldSize + NewSize); 1685 1686 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1687 1688 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1689 1690 if (InitialHeapSize == 0) { 1691 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1692 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1693 1694 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1695 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1696 1697 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1698 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1699 } 1700 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1701 // synchronize with InitialHeapSize to avoid errors with the default value. 1702 if (MinHeapSize == 0) { 1703 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1704 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1705 } 1706 } 1707 } 1708 1709 // This option inspects the machine and attempts to set various 1710 // parameters to be optimal for long-running, memory allocation 1711 // intensive jobs. It is intended for machines with large 1712 // amounts of cpu and memory. 1713 jint Arguments::set_aggressive_heap_flags() { 1714 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1715 // VM, but we may not be able to represent the total physical memory 1716 // available (like having 8gb of memory on a box but using a 32bit VM). 1717 // Thus, we need to make sure we're using a julong for intermediate 1718 // calculations. 1719 julong initHeapSize; 1720 julong total_memory = os::physical_memory(); 1721 1722 if (total_memory < (julong) 256 * M) { 1723 jio_fprintf(defaultStream::error_stream(), 1724 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1725 vm_exit(1); 1726 } 1727 1728 // The heap size is half of available memory, or (at most) 1729 // all of possible memory less 160mb (leaving room for the OS 1730 // when using ISM). This is the maximum; because adaptive sizing 1731 // is turned on below, the actual space used may be smaller. 1732 1733 initHeapSize = MIN2(total_memory / (julong) 2, 1734 total_memory - (julong) 160 * M); 1735 1736 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1737 1738 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1739 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1740 return JNI_EINVAL; 1741 } 1742 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1743 return JNI_EINVAL; 1744 } 1745 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1746 return JNI_EINVAL; 1747 } 1748 } 1749 if (FLAG_IS_DEFAULT(NewSize)) { 1750 // Make the young generation 3/8ths of the total heap. 1751 if (FLAG_SET_CMDLINE(NewSize, 1752 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1753 return JNI_EINVAL; 1754 } 1755 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1756 return JNI_EINVAL; 1757 } 1758 } 1759 1760 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1761 FLAG_SET_DEFAULT(UseLargePages, true); 1762 #endif 1763 1764 // Increase some data structure sizes for efficiency 1765 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1766 return JNI_EINVAL; 1767 } 1768 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1769 return JNI_EINVAL; 1770 } 1771 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1772 return JNI_EINVAL; 1773 } 1774 1775 // See the OldPLABSize comment below, but replace 'after promotion' 1776 // with 'after copying'. YoungPLABSize is the size of the survivor 1777 // space per-gc-thread buffers. The default is 4kw. 1778 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1779 return JNI_EINVAL; 1780 } 1781 1782 // OldPLABSize is the size of the buffers in the old gen that 1783 // UseParallelGC uses to promote live data that doesn't fit in the 1784 // survivor spaces. At any given time, there's one for each gc thread. 1785 // The default size is 1kw. These buffers are rarely used, since the 1786 // survivor spaces are usually big enough. For specjbb, however, there 1787 // are occasions when there's lots of live data in the young gen 1788 // and we end up promoting some of it. We don't have a definite 1789 // explanation for why bumping OldPLABSize helps, but the theory 1790 // is that a bigger PLAB results in retaining something like the 1791 // original allocation order after promotion, which improves mutator 1792 // locality. A minor effect may be that larger PLABs reduce the 1793 // number of PLAB allocation events during gc. The value of 8kw 1794 // was arrived at by experimenting with specjbb. 1795 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1796 return JNI_EINVAL; 1797 } 1798 1799 // Enable parallel GC and adaptive generation sizing 1800 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1801 return JNI_EINVAL; 1802 } 1803 1804 // Encourage steady state memory management 1805 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1806 return JNI_EINVAL; 1807 } 1808 1809 // This appears to improve mutator locality 1810 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1811 return JNI_EINVAL; 1812 } 1813 1814 return JNI_OK; 1815 } 1816 1817 // This must be called after ergonomics. 1818 void Arguments::set_bytecode_flags() { 1819 if (!RewriteBytecodes) { 1820 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1821 } 1822 } 1823 1824 // Aggressive optimization flags 1825 jint Arguments::set_aggressive_opts_flags() { 1826 #ifdef COMPILER2 1827 if (AggressiveUnboxing) { 1828 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1829 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1830 } else if (!EliminateAutoBox) { 1831 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1832 AggressiveUnboxing = false; 1833 } 1834 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1835 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1836 } else if (!DoEscapeAnalysis) { 1837 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1838 AggressiveUnboxing = false; 1839 } 1840 } 1841 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1842 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1843 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1844 } 1845 // Feed the cache size setting into the JDK 1846 char buffer[1024]; 1847 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1848 if (!add_property(buffer)) { 1849 return JNI_ENOMEM; 1850 } 1851 } 1852 #endif 1853 1854 return JNI_OK; 1855 } 1856 1857 //=========================================================================================================== 1858 1859 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1860 if (_sun_java_launcher != _default_java_launcher) { 1861 os::free(const_cast<char*>(_sun_java_launcher)); 1862 } 1863 _sun_java_launcher = os::strdup_check_oom(launcher); 1864 } 1865 1866 bool Arguments::created_by_java_launcher() { 1867 assert(_sun_java_launcher != nullptr, "property must have value"); 1868 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1869 } 1870 1871 bool Arguments::sun_java_launcher_is_altjvm() { 1872 return _sun_java_launcher_is_altjvm; 1873 } 1874 1875 //=========================================================================================================== 1876 // Parsing of main arguments 1877 1878 unsigned int addreads_count = 0; 1879 unsigned int addexports_count = 0; 1880 unsigned int addopens_count = 0; 1881 unsigned int addmods_count = 0; 1882 unsigned int patch_mod_count = 0; 1883 unsigned int enable_native_access_count = 0; 1884 1885 // Check the consistency of vm_init_args 1886 bool Arguments::check_vm_args_consistency() { 1887 // Method for adding checks for flag consistency. 1888 // The intent is to warn the user of all possible conflicts, 1889 // before returning an error. 1890 // Note: Needs platform-dependent factoring. 1891 bool status = true; 1892 1893 if (TLABRefillWasteFraction == 0) { 1894 jio_fprintf(defaultStream::error_stream(), 1895 "TLABRefillWasteFraction should be a denominator, " 1896 "not " SIZE_FORMAT "\n", 1897 TLABRefillWasteFraction); 1898 status = false; 1899 } 1900 1901 status = CompilerConfig::check_args_consistency(status); 1902 #if INCLUDE_JVMCI 1903 if (status && EnableJVMCI) { 1904 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 1905 AddProperty, UnwriteableProperty, InternalProperty); 1906 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) { 1907 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 1908 return false; 1909 } 1910 } 1911 } 1912 #endif 1913 1914 #if INCLUDE_JFR 1915 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1916 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) { 1917 return false; 1918 } 1919 } 1920 #endif 1921 1922 #ifndef SUPPORT_RESERVED_STACK_AREA 1923 if (StackReservedPages != 0) { 1924 FLAG_SET_CMDLINE(StackReservedPages, 0); 1925 warning("Reserved Stack Area not supported on this platform"); 1926 } 1927 #endif 1928 1929 1930 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) 1931 if (LockingMode == LM_LIGHTWEIGHT) { 1932 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY); 1933 warning("New lightweight locking not supported on this platform"); 1934 } 1935 #endif 1936 1937 if (UseHeavyMonitors) { 1938 if (FLAG_IS_CMDLINE(LockingMode) && LockingMode != LM_MONITOR) { 1939 jio_fprintf(defaultStream::error_stream(), 1940 "Conflicting -XX:+UseHeavyMonitors and -XX:LockingMode=%d flags", LockingMode); 1941 return false; 1942 } 1943 FLAG_SET_CMDLINE(LockingMode, LM_MONITOR); 1944 } 1945 1946 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) 1947 if (LockingMode == LM_MONITOR) { 1948 jio_fprintf(defaultStream::error_stream(), 1949 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture"); 1950 return false; 1951 } 1952 #endif 1953 #if (defined(X86) || defined(PPC64)) && !defined(ZERO) 1954 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) { 1955 jio_fprintf(defaultStream::error_stream(), 1956 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive"); 1957 1958 return false; 1959 } 1960 #endif 1961 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) { 1962 jio_fprintf(defaultStream::error_stream(), 1963 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)"); 1964 return false; 1965 } 1966 return status; 1967 } 1968 1969 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1970 const char* option_type) { 1971 if (ignore) return false; 1972 1973 const char* spacer = " "; 1974 if (option_type == nullptr) { 1975 option_type = ++spacer; // Set both to the empty string. 1976 } 1977 1978 jio_fprintf(defaultStream::error_stream(), 1979 "Unrecognized %s%soption: %s\n", option_type, spacer, 1980 option->optionString); 1981 return true; 1982 } 1983 1984 static const char* user_assertion_options[] = { 1985 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1986 }; 1987 1988 static const char* system_assertion_options[] = { 1989 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1990 }; 1991 1992 bool Arguments::parse_uintx(const char* value, 1993 uintx* uintx_arg, 1994 uintx min_size) { 1995 uintx n; 1996 if (!parse_integer(value, &n)) { 1997 return false; 1998 } 1999 if (n >= min_size) { 2000 *uintx_arg = n; 2001 return true; 2002 } else { 2003 return false; 2004 } 2005 } 2006 2007 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2008 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 2009 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2010 char* property = AllocateHeap(prop_len, mtArguments); 2011 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2012 if (ret < 0 || ret >= (int)prop_len) { 2013 FreeHeap(property); 2014 return false; 2015 } 2016 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 2017 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 2018 // that multiple occurrences of the associated flag just causes the existing property value to be 2019 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 2020 // to a property after we have finished flag processing. 2021 bool added = add_property(property, WriteableProperty, internal); 2022 FreeHeap(property); 2023 return added; 2024 } 2025 2026 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2027 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 2028 const unsigned int props_count_limit = 1000; 2029 const int max_digits = 3; 2030 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2031 2032 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2033 if (count < props_count_limit) { 2034 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2035 char* property = AllocateHeap(prop_len, mtArguments); 2036 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2037 if (ret < 0 || ret >= (int)prop_len) { 2038 FreeHeap(property); 2039 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2040 return false; 2041 } 2042 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2043 FreeHeap(property); 2044 return added; 2045 } 2046 2047 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2048 return false; 2049 } 2050 2051 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2052 julong* long_arg, 2053 julong min_size, 2054 julong max_size) { 2055 if (!parse_integer(s, long_arg)) return arg_unreadable; 2056 return check_memory_size(*long_arg, min_size, max_size); 2057 } 2058 2059 // Parse JavaVMInitArgs structure 2060 2061 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 2062 const JavaVMInitArgs *java_tool_options_args, 2063 const JavaVMInitArgs *java_options_args, 2064 const JavaVMInitArgs *cmd_line_args) { 2065 bool patch_mod_javabase = false; 2066 2067 // Save default settings for some mode flags 2068 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2069 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2070 Arguments::_ClipInlining = ClipInlining; 2071 Arguments::_BackgroundCompilation = BackgroundCompilation; 2072 2073 // Remember the default value of SharedBaseAddress. 2074 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 2075 2076 // Setup flags for mixed which is the default 2077 set_mode_flags(_mixed); 2078 2079 // Parse args structure generated from java.base vm options resource 2080 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE); 2081 if (result != JNI_OK) { 2082 return result; 2083 } 2084 2085 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2086 // variable (if present). 2087 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 2088 if (result != JNI_OK) { 2089 return result; 2090 } 2091 2092 // Parse args structure generated from the command line flags. 2093 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE); 2094 if (result != JNI_OK) { 2095 return result; 2096 } 2097 2098 // Parse args structure generated from the _JAVA_OPTIONS environment 2099 // variable (if present) (mimics classic VM) 2100 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 2101 if (result != JNI_OK) { 2102 return result; 2103 } 2104 2105 // Disable CDS for exploded image 2106 if (!has_jimage()) { 2107 no_shared_spaces("CDS disabled on exploded JDK"); 2108 } 2109 2110 // We need to ensure processor and memory resources have been properly 2111 // configured - which may rely on arguments we just processed - before 2112 // doing the final argument processing. Any argument processing that 2113 // needs to know about processor and memory resources must occur after 2114 // this point. 2115 2116 os::init_container_support(); 2117 2118 SystemMemoryBarrier::initialize(); 2119 2120 // Do final processing now that all arguments have been parsed 2121 result = finalize_vm_init_args(patch_mod_javabase); 2122 if (result != JNI_OK) { 2123 return result; 2124 } 2125 2126 return JNI_OK; 2127 } 2128 2129 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2130 // represents a valid JDWP agent. is_path==true denotes that we 2131 // are dealing with -agentpath (case where name is a path), otherwise with 2132 // -agentlib 2133 bool valid_jdwp_agent(char *name, bool is_path) { 2134 char *_name; 2135 const char *_jdwp = "jdwp"; 2136 size_t _len_jdwp, _len_prefix; 2137 2138 if (is_path) { 2139 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) { 2140 return false; 2141 } 2142 2143 _name++; // skip past last path separator 2144 _len_prefix = strlen(JNI_LIB_PREFIX); 2145 2146 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2147 return false; 2148 } 2149 2150 _name += _len_prefix; 2151 _len_jdwp = strlen(_jdwp); 2152 2153 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2154 _name += _len_jdwp; 2155 } 2156 else { 2157 return false; 2158 } 2159 2160 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2161 return false; 2162 } 2163 2164 return true; 2165 } 2166 2167 if (strcmp(name, _jdwp) == 0) { 2168 return true; 2169 } 2170 2171 return false; 2172 } 2173 2174 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2175 // --patch-module=<module>=<file>(<pathsep><file>)* 2176 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value"); 2177 // Find the equal sign between the module name and the path specification 2178 const char* module_equal = strchr(patch_mod_tail, '='); 2179 if (module_equal == nullptr) { 2180 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2181 return JNI_ERR; 2182 } else { 2183 // Pick out the module name 2184 size_t module_len = module_equal - patch_mod_tail; 2185 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2186 if (module_name != nullptr) { 2187 memcpy(module_name, patch_mod_tail, module_len); 2188 *(module_name + module_len) = '\0'; 2189 // The path piece begins one past the module_equal sign 2190 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2191 FREE_C_HEAP_ARRAY(char, module_name); 2192 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2193 return JNI_ENOMEM; 2194 } 2195 } else { 2196 return JNI_ENOMEM; 2197 } 2198 } 2199 return JNI_OK; 2200 } 2201 2202 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2203 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2204 // The min and max sizes match the values in globals.hpp, but scaled 2205 // with K. The values have been chosen so that alignment with page 2206 // size doesn't change the max value, which makes the conversions 2207 // back and forth between Xss value and ThreadStackSize value easier. 2208 // The values have also been chosen to fit inside a 32-bit signed type. 2209 const julong min_ThreadStackSize = 0; 2210 const julong max_ThreadStackSize = 1 * M; 2211 2212 // Make sure the above values match the range set in globals.hpp 2213 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2214 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2215 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2216 2217 const julong min_size = min_ThreadStackSize * K; 2218 const julong max_size = max_ThreadStackSize * K; 2219 2220 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2221 2222 julong size = 0; 2223 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2224 if (errcode != arg_in_range) { 2225 bool silent = (option == nullptr); // Allow testing to silence error messages 2226 if (!silent) { 2227 jio_fprintf(defaultStream::error_stream(), 2228 "Invalid thread stack size: %s\n", option->optionString); 2229 describe_range_error(errcode); 2230 } 2231 return JNI_EINVAL; 2232 } 2233 2234 // Internally track ThreadStackSize in units of 1024 bytes. 2235 const julong size_aligned = align_up(size, K); 2236 assert(size <= size_aligned, 2237 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2238 size, size_aligned); 2239 2240 const julong size_in_K = size_aligned / K; 2241 assert(size_in_K < (julong)max_intx, 2242 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2243 size_in_K); 2244 2245 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2246 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2247 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2248 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2249 max_expanded, size_in_K); 2250 2251 *out_ThreadStackSize = (intx)size_in_K; 2252 2253 return JNI_OK; 2254 } 2255 2256 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) { 2257 // For match_option to return remaining or value part of option string 2258 const char* tail; 2259 2260 // iterate over arguments 2261 for (int index = 0; index < args->nOptions; index++) { 2262 bool is_absolute_path = false; // for -agentpath vs -agentlib 2263 2264 const JavaVMOption* option = args->options + index; 2265 2266 if (!match_option(option, "-Djava.class.path", &tail) && 2267 !match_option(option, "-Dsun.java.command", &tail) && 2268 !match_option(option, "-Dsun.java.launcher", &tail)) { 2269 2270 // add all jvm options to the jvm_args string. This string 2271 // is used later to set the java.vm.args PerfData string constant. 2272 // the -Djava.class.path and the -Dsun.java.command options are 2273 // omitted from jvm_args string as each have their own PerfData 2274 // string constant object. 2275 build_jvm_args(option->optionString); 2276 } 2277 2278 // -verbose:[class/module/gc/jni] 2279 if (match_option(option, "-verbose", &tail)) { 2280 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2281 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2282 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2283 } else if (!strcmp(tail, ":module")) { 2284 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2285 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2286 } else if (!strcmp(tail, ":gc")) { 2287 if (_legacyGCLogging.lastFlag == 0) { 2288 _legacyGCLogging.lastFlag = 1; 2289 } 2290 } else if (!strcmp(tail, ":jni")) { 2291 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2292 } 2293 // -da / -ea / -disableassertions / -enableassertions 2294 // These accept an optional class/package name separated by a colon, e.g., 2295 // -da:java.lang.Thread. 2296 } else if (match_option(option, user_assertion_options, &tail, true)) { 2297 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2298 if (*tail == '\0') { 2299 JavaAssertions::setUserClassDefault(enable); 2300 } else { 2301 assert(*tail == ':', "bogus match by match_option()"); 2302 JavaAssertions::addOption(tail + 1, enable); 2303 } 2304 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2305 } else if (match_option(option, system_assertion_options, &tail, false)) { 2306 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2307 JavaAssertions::setSystemClassDefault(enable); 2308 // -bootclasspath: 2309 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2310 jio_fprintf(defaultStream::output_stream(), 2311 "-Xbootclasspath is no longer a supported option.\n"); 2312 return JNI_EINVAL; 2313 // -bootclasspath/a: 2314 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2315 Arguments::append_sysclasspath(tail); 2316 #if INCLUDE_CDS 2317 MetaspaceShared::disable_optimized_module_handling(); 2318 log_info(cds)("optimized module handling: disabled because bootclasspath was appended"); 2319 #endif 2320 // -bootclasspath/p: 2321 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2322 jio_fprintf(defaultStream::output_stream(), 2323 "-Xbootclasspath/p is no longer a supported option.\n"); 2324 return JNI_EINVAL; 2325 // -Xrun 2326 } else if (match_option(option, "-Xrun", &tail)) { 2327 if (tail != nullptr) { 2328 const char* pos = strchr(tail, ':'); 2329 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail; 2330 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2331 jio_snprintf(name, len + 1, "%s", tail); 2332 2333 char *options = nullptr; 2334 if(pos != nullptr) { 2335 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2336 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2337 } 2338 #if !INCLUDE_JVMTI 2339 if (strcmp(name, "jdwp") == 0) { 2340 jio_fprintf(defaultStream::error_stream(), 2341 "Debugging agents are not supported in this VM\n"); 2342 return JNI_ERR; 2343 } 2344 #endif // !INCLUDE_JVMTI 2345 JvmtiAgentList::add_xrun(name, options, false); 2346 FREE_C_HEAP_ARRAY(char, name); 2347 FREE_C_HEAP_ARRAY(char, options); 2348 } 2349 } else if (match_option(option, "--add-reads=", &tail)) { 2350 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2351 return JNI_ENOMEM; 2352 } 2353 } else if (match_option(option, "--add-exports=", &tail)) { 2354 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2355 return JNI_ENOMEM; 2356 } 2357 } else if (match_option(option, "--add-opens=", &tail)) { 2358 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2359 return JNI_ENOMEM; 2360 } 2361 } else if (match_option(option, "--add-modules=", &tail)) { 2362 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2363 return JNI_ENOMEM; 2364 } 2365 } else if (match_option(option, "--enable-native-access=", &tail)) { 2366 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2367 return JNI_ENOMEM; 2368 } 2369 } else if (match_option(option, "--limit-modules=", &tail)) { 2370 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2371 return JNI_ENOMEM; 2372 } 2373 } else if (match_option(option, "--module-path=", &tail)) { 2374 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2375 return JNI_ENOMEM; 2376 } 2377 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2378 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2379 return JNI_ENOMEM; 2380 } 2381 } else if (match_option(option, "--patch-module=", &tail)) { 2382 // --patch-module=<module>=<file>(<pathsep><file>)* 2383 int res = process_patch_mod_option(tail, patch_mod_javabase); 2384 if (res != JNI_OK) { 2385 return res; 2386 } 2387 } else if (match_option(option, "--illegal-access=", &tail)) { 2388 char version[256]; 2389 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2390 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2391 // -agentlib and -agentpath 2392 } else if (match_option(option, "-agentlib:", &tail) || 2393 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2394 if(tail != nullptr) { 2395 const char* pos = strchr(tail, '='); 2396 char* name; 2397 if (pos == nullptr) { 2398 name = os::strdup_check_oom(tail, mtArguments); 2399 } else { 2400 size_t len = pos - tail; 2401 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2402 memcpy(name, tail, len); 2403 name[len] = '\0'; 2404 } 2405 2406 char *options = nullptr; 2407 if(pos != nullptr) { 2408 options = os::strdup_check_oom(pos + 1, mtArguments); 2409 } 2410 #if !INCLUDE_JVMTI 2411 if (valid_jdwp_agent(name, is_absolute_path)) { 2412 jio_fprintf(defaultStream::error_stream(), 2413 "Debugging agents are not supported in this VM\n"); 2414 return JNI_ERR; 2415 } 2416 #endif // !INCLUDE_JVMTI 2417 JvmtiAgentList::add(name, options, is_absolute_path); 2418 os::free(name); 2419 os::free(options); 2420 } 2421 // -javaagent 2422 } else if (match_option(option, "-javaagent:", &tail)) { 2423 #if !INCLUDE_JVMTI 2424 jio_fprintf(defaultStream::error_stream(), 2425 "Instrumentation agents are not supported in this VM\n"); 2426 return JNI_ERR; 2427 #else 2428 if (tail != nullptr) { 2429 size_t length = strlen(tail) + 1; 2430 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2431 jio_snprintf(options, length, "%s", tail); 2432 JvmtiAgentList::add("instrument", options, false); 2433 FREE_C_HEAP_ARRAY(char, options); 2434 2435 // java agents need module java.instrument 2436 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2437 return JNI_ENOMEM; 2438 } 2439 } 2440 #endif // !INCLUDE_JVMTI 2441 // --enable_preview 2442 } else if (match_option(option, "--enable-preview")) { 2443 set_enable_preview(); 2444 // -Xnoclassgc 2445 } else if (match_option(option, "-Xnoclassgc")) { 2446 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2447 return JNI_EINVAL; 2448 } 2449 // -Xbatch 2450 } else if (match_option(option, "-Xbatch")) { 2451 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2452 return JNI_EINVAL; 2453 } 2454 // -Xmn for compatibility with other JVM vendors 2455 } else if (match_option(option, "-Xmn", &tail)) { 2456 julong long_initial_young_size = 0; 2457 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2458 if (errcode != arg_in_range) { 2459 jio_fprintf(defaultStream::error_stream(), 2460 "Invalid initial young generation size: %s\n", option->optionString); 2461 describe_range_error(errcode); 2462 return JNI_EINVAL; 2463 } 2464 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2465 return JNI_EINVAL; 2466 } 2467 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2468 return JNI_EINVAL; 2469 } 2470 // -Xms 2471 } else if (match_option(option, "-Xms", &tail)) { 2472 julong size = 0; 2473 // an initial heap size of 0 means automatically determine 2474 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2475 if (errcode != arg_in_range) { 2476 jio_fprintf(defaultStream::error_stream(), 2477 "Invalid initial heap size: %s\n", option->optionString); 2478 describe_range_error(errcode); 2479 return JNI_EINVAL; 2480 } 2481 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2482 return JNI_EINVAL; 2483 } 2484 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2485 return JNI_EINVAL; 2486 } 2487 // -Xmx 2488 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2489 julong long_max_heap_size = 0; 2490 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2491 if (errcode != arg_in_range) { 2492 jio_fprintf(defaultStream::error_stream(), 2493 "Invalid maximum heap size: %s\n", option->optionString); 2494 describe_range_error(errcode); 2495 return JNI_EINVAL; 2496 } 2497 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2498 return JNI_EINVAL; 2499 } 2500 // Xmaxf 2501 } else if (match_option(option, "-Xmaxf", &tail)) { 2502 char* err; 2503 int maxf = (int)(strtod(tail, &err) * 100); 2504 if (*err != '\0' || *tail == '\0') { 2505 jio_fprintf(defaultStream::error_stream(), 2506 "Bad max heap free percentage size: %s\n", 2507 option->optionString); 2508 return JNI_EINVAL; 2509 } else { 2510 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2511 return JNI_EINVAL; 2512 } 2513 } 2514 // Xminf 2515 } else if (match_option(option, "-Xminf", &tail)) { 2516 char* err; 2517 int minf = (int)(strtod(tail, &err) * 100); 2518 if (*err != '\0' || *tail == '\0') { 2519 jio_fprintf(defaultStream::error_stream(), 2520 "Bad min heap free percentage size: %s\n", 2521 option->optionString); 2522 return JNI_EINVAL; 2523 } else { 2524 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2525 return JNI_EINVAL; 2526 } 2527 } 2528 // -Xss 2529 } else if (match_option(option, "-Xss", &tail)) { 2530 intx value = 0; 2531 jint err = parse_xss(option, tail, &value); 2532 if (err != JNI_OK) { 2533 return err; 2534 } 2535 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2536 return JNI_EINVAL; 2537 } 2538 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2539 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2540 julong long_ReservedCodeCacheSize = 0; 2541 2542 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2543 if (errcode != arg_in_range) { 2544 jio_fprintf(defaultStream::error_stream(), 2545 "Invalid maximum code cache size: %s.\n", option->optionString); 2546 return JNI_EINVAL; 2547 } 2548 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2549 return JNI_EINVAL; 2550 } 2551 // -green 2552 } else if (match_option(option, "-green")) { 2553 jio_fprintf(defaultStream::error_stream(), 2554 "Green threads support not available\n"); 2555 return JNI_EINVAL; 2556 // -native 2557 } else if (match_option(option, "-native")) { 2558 // HotSpot always uses native threads, ignore silently for compatibility 2559 // -Xrs 2560 } else if (match_option(option, "-Xrs")) { 2561 // Classic/EVM option, new functionality 2562 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2563 return JNI_EINVAL; 2564 } 2565 // -Xprof 2566 } else if (match_option(option, "-Xprof")) { 2567 char version[256]; 2568 // Obsolete in JDK 10 2569 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2570 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2571 // -Xinternalversion 2572 } else if (match_option(option, "-Xinternalversion")) { 2573 jio_fprintf(defaultStream::output_stream(), "%s\n", 2574 VM_Version::internal_vm_info_string()); 2575 vm_exit(0); 2576 #ifndef PRODUCT 2577 // -Xprintflags 2578 } else if (match_option(option, "-Xprintflags")) { 2579 JVMFlag::printFlags(tty, false); 2580 vm_exit(0); 2581 #endif 2582 // -D 2583 } else if (match_option(option, "-D", &tail)) { 2584 const char* value; 2585 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2586 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2587 // abort if -Djava.endorsed.dirs is set 2588 jio_fprintf(defaultStream::output_stream(), 2589 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2590 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2591 return JNI_EINVAL; 2592 } 2593 if (match_option(option, "-Djava.ext.dirs=", &value) && 2594 *value != '\0' && strcmp(value, "\"\"") != 0) { 2595 // abort if -Djava.ext.dirs is set 2596 jio_fprintf(defaultStream::output_stream(), 2597 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2598 return JNI_EINVAL; 2599 } 2600 // Check for module related properties. They must be set using the modules 2601 // options. For example: use "--add-modules=java.sql", not 2602 // "-Djdk.module.addmods=java.sql" 2603 if (is_internal_module_property(option->optionString + 2)) { 2604 needs_module_property_warning = true; 2605 continue; 2606 } 2607 if (!add_property(tail)) { 2608 return JNI_ENOMEM; 2609 } 2610 // Out of the box management support 2611 if (match_option(option, "-Dcom.sun.management", &tail)) { 2612 #if INCLUDE_MANAGEMENT 2613 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2614 return JNI_EINVAL; 2615 } 2616 // management agent in module jdk.management.agent 2617 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2618 return JNI_ENOMEM; 2619 } 2620 #else 2621 jio_fprintf(defaultStream::output_stream(), 2622 "-Dcom.sun.management is not supported in this VM.\n"); 2623 return JNI_ERR; 2624 #endif 2625 } 2626 // -Xint 2627 } else if (match_option(option, "-Xint")) { 2628 set_mode_flags(_int); 2629 // -Xmixed 2630 } else if (match_option(option, "-Xmixed")) { 2631 set_mode_flags(_mixed); 2632 // -Xcomp 2633 } else if (match_option(option, "-Xcomp")) { 2634 // for testing the compiler; turn off all flags that inhibit compilation 2635 set_mode_flags(_comp); 2636 // -Xshare:dump 2637 } else if (match_option(option, "-Xshare:dump")) { 2638 DumpSharedSpaces = true; 2639 // -Xshare:on 2640 } else if (match_option(option, "-Xshare:on")) { 2641 UseSharedSpaces = true; 2642 RequireSharedSpaces = true; 2643 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2644 } else if (match_option(option, "-Xshare:auto")) { 2645 UseSharedSpaces = true; 2646 RequireSharedSpaces = false; 2647 xshare_auto_cmd_line = true; 2648 // -Xshare:off 2649 } else if (match_option(option, "-Xshare:off")) { 2650 UseSharedSpaces = false; 2651 RequireSharedSpaces = false; 2652 // -Xverify 2653 } else if (match_option(option, "-Xverify", &tail)) { 2654 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2655 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2656 return JNI_EINVAL; 2657 } 2658 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2659 return JNI_EINVAL; 2660 } 2661 } else if (strcmp(tail, ":remote") == 0) { 2662 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2663 return JNI_EINVAL; 2664 } 2665 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2666 return JNI_EINVAL; 2667 } 2668 } else if (strcmp(tail, ":none") == 0) { 2669 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2670 return JNI_EINVAL; 2671 } 2672 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2673 return JNI_EINVAL; 2674 } 2675 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2676 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2677 return JNI_EINVAL; 2678 } 2679 // -Xdebug 2680 } else if (match_option(option, "-Xdebug")) { 2681 // note this flag has been used, then ignore 2682 set_xdebug_mode(true); 2683 // -Xnoagent 2684 } else if (match_option(option, "-Xnoagent")) { 2685 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2686 } else if (match_option(option, "-Xloggc:", &tail)) { 2687 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2688 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2689 _legacyGCLogging.lastFlag = 2; 2690 _legacyGCLogging.file = os::strdup_check_oom(tail); 2691 } else if (match_option(option, "-Xlog", &tail)) { 2692 bool ret = false; 2693 if (strcmp(tail, ":help") == 0) { 2694 fileStream stream(defaultStream::output_stream()); 2695 LogConfiguration::print_command_line_help(&stream); 2696 vm_exit(0); 2697 } else if (strcmp(tail, ":disable") == 0) { 2698 LogConfiguration::disable_logging(); 2699 ret = true; 2700 } else if (strcmp(tail, ":async") == 0) { 2701 LogConfiguration::set_async_mode(true); 2702 ret = true; 2703 } else if (*tail == '\0') { 2704 ret = LogConfiguration::parse_command_line_arguments(); 2705 assert(ret, "-Xlog without arguments should never fail to parse"); 2706 } else if (*tail == ':') { 2707 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2708 } 2709 if (ret == false) { 2710 jio_fprintf(defaultStream::error_stream(), 2711 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2712 tail); 2713 return JNI_EINVAL; 2714 } 2715 // JNI hooks 2716 } else if (match_option(option, "-Xcheck", &tail)) { 2717 if (!strcmp(tail, ":jni")) { 2718 #if !INCLUDE_JNI_CHECK 2719 warning("JNI CHECKING is not supported in this VM"); 2720 #else 2721 CheckJNICalls = true; 2722 #endif // INCLUDE_JNI_CHECK 2723 } else if (is_bad_option(option, args->ignoreUnrecognized, 2724 "check")) { 2725 return JNI_EINVAL; 2726 } 2727 } else if (match_option(option, "vfprintf")) { 2728 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2729 } else if (match_option(option, "exit")) { 2730 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2731 } else if (match_option(option, "abort")) { 2732 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2733 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2734 // and the last option wins. 2735 } else if (match_option(option, "-XX:+NeverTenure")) { 2736 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2737 return JNI_EINVAL; 2738 } 2739 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2740 return JNI_EINVAL; 2741 } 2742 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2743 return JNI_EINVAL; 2744 } 2745 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2746 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2747 return JNI_EINVAL; 2748 } 2749 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2750 return JNI_EINVAL; 2751 } 2752 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2753 return JNI_EINVAL; 2754 } 2755 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2756 uintx max_tenuring_thresh = 0; 2757 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2758 jio_fprintf(defaultStream::error_stream(), 2759 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2760 return JNI_EINVAL; 2761 } 2762 2763 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2764 return JNI_EINVAL; 2765 } 2766 2767 if (MaxTenuringThreshold == 0) { 2768 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2769 return JNI_EINVAL; 2770 } 2771 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2772 return JNI_EINVAL; 2773 } 2774 } else { 2775 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2776 return JNI_EINVAL; 2777 } 2778 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2779 return JNI_EINVAL; 2780 } 2781 } 2782 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2783 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2784 return JNI_EINVAL; 2785 } 2786 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2787 return JNI_EINVAL; 2788 } 2789 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2790 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2791 return JNI_EINVAL; 2792 } 2793 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2794 return JNI_EINVAL; 2795 } 2796 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2797 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2798 return JNI_EINVAL; 2799 } 2800 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2801 return JNI_EINVAL; 2802 } 2803 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2804 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2805 return JNI_EINVAL; 2806 } 2807 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2808 return JNI_EINVAL; 2809 } 2810 } else if (match_option(option, "--finalization=", &tail)) { 2811 if (strcmp(tail, "enabled") == 0) { 2812 InstanceKlass::set_finalization_enabled(true); 2813 } else if (strcmp(tail, "disabled") == 0) { 2814 InstanceKlass::set_finalization_enabled(false); 2815 } else { 2816 jio_fprintf(defaultStream::error_stream(), 2817 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2818 tail); 2819 return JNI_EINVAL; 2820 } 2821 #if !defined(DTRACE_ENABLED) 2822 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2823 jio_fprintf(defaultStream::error_stream(), 2824 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2825 return JNI_EINVAL; 2826 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2827 jio_fprintf(defaultStream::error_stream(), 2828 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2829 return JNI_EINVAL; 2830 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2831 jio_fprintf(defaultStream::error_stream(), 2832 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2833 return JNI_EINVAL; 2834 #endif // !defined(DTRACE_ENABLED) 2835 #ifdef ASSERT 2836 } else if (match_option(option, "-XX:+FullGCALot")) { 2837 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2838 return JNI_EINVAL; 2839 } 2840 // disable scavenge before parallel mark-compact 2841 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2842 return JNI_EINVAL; 2843 } 2844 #endif 2845 #if !INCLUDE_MANAGEMENT 2846 } else if (match_option(option, "-XX:+ManagementServer")) { 2847 jio_fprintf(defaultStream::error_stream(), 2848 "ManagementServer is not supported in this VM.\n"); 2849 return JNI_ERR; 2850 #endif // INCLUDE_MANAGEMENT 2851 #if INCLUDE_JVMCI 2852 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) { 2853 if (EnableJVMCIProduct) { 2854 jio_fprintf(defaultStream::error_stream(), 2855 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n"); 2856 return JNI_EINVAL; 2857 } 2858 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) { 2859 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before 2860 if (EnableJVMCIProduct) { 2861 continue; 2862 } 2863 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2864 // Allow this flag if it has been unlocked. 2865 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) { 2866 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) { 2867 jio_fprintf(defaultStream::error_stream(), 2868 "Unable to enable JVMCI in product mode"); 2869 return JNI_ERR; 2870 } 2871 } 2872 // The flag was locked so process normally to report that error 2873 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2874 return JNI_EINVAL; 2875 } 2876 #endif // INCLUDE_JVMCI 2877 #if INCLUDE_JFR 2878 } else if (match_jfr_option(&option)) { 2879 return JNI_EINVAL; 2880 #endif 2881 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2882 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2883 // already been handled 2884 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2885 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2886 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2887 return JNI_EINVAL; 2888 } 2889 } 2890 // Unknown option 2891 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2892 return JNI_ERR; 2893 } 2894 } 2895 2896 // PrintSharedArchiveAndExit will turn on 2897 // -Xshare:on 2898 // -Xlog:class+path=info 2899 if (PrintSharedArchiveAndExit) { 2900 UseSharedSpaces = true; 2901 RequireSharedSpaces = true; 2902 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2903 } 2904 2905 fix_appclasspath(); 2906 2907 return JNI_OK; 2908 } 2909 2910 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 2911 // For java.base check for duplicate --patch-module options being specified on the command line. 2912 // This check is only required for java.base, all other duplicate module specifications 2913 // will be checked during module system initialization. The module system initialization 2914 // will throw an ExceptionInInitializerError if this situation occurs. 2915 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2916 if (*patch_mod_javabase) { 2917 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2918 } else { 2919 *patch_mod_javabase = true; 2920 } 2921 } 2922 2923 // Create GrowableArray lazily, only if --patch-module has been specified 2924 if (_patch_mod_prefix == nullptr) { 2925 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2926 } 2927 2928 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2929 } 2930 2931 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2932 // 2933 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2934 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2935 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2936 // path is treated as the current directory. 2937 // 2938 // This causes problems with CDS, which requires that all directories specified in the classpath 2939 // must be empty. In most cases, applications do NOT want to load classes from the current 2940 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2941 // scripts compatible with CDS. 2942 void Arguments::fix_appclasspath() { 2943 if (IgnoreEmptyClassPaths) { 2944 const char separator = *os::path_separator(); 2945 const char* src = _java_class_path->value(); 2946 2947 // skip over all the leading empty paths 2948 while (*src == separator) { 2949 src ++; 2950 } 2951 2952 char* copy = os::strdup_check_oom(src, mtArguments); 2953 2954 // trim all trailing empty paths 2955 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 2956 *tail = '\0'; 2957 } 2958 2959 char from[3] = {separator, separator, '\0'}; 2960 char to [2] = {separator, '\0'}; 2961 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 2962 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 2963 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 2964 } 2965 2966 _java_class_path->set_writeable_value(copy); 2967 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 2968 } 2969 } 2970 2971 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 2972 // check if the default lib/endorsed directory exists; if so, error 2973 char path[JVM_MAXPATHLEN]; 2974 const char* fileSep = os::file_separator(); 2975 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 2976 2977 DIR* dir = os::opendir(path); 2978 if (dir != nullptr) { 2979 jio_fprintf(defaultStream::output_stream(), 2980 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 2981 "in modular form will be supported via the concept of upgradeable modules.\n"); 2982 os::closedir(dir); 2983 return JNI_ERR; 2984 } 2985 2986 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 2987 dir = os::opendir(path); 2988 if (dir != nullptr) { 2989 jio_fprintf(defaultStream::output_stream(), 2990 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 2991 "Use -classpath instead.\n."); 2992 os::closedir(dir); 2993 return JNI_ERR; 2994 } 2995 2996 // This must be done after all arguments have been processed 2997 // and the container support has been initialized since AggressiveHeap 2998 // relies on the amount of total memory available. 2999 if (AggressiveHeap) { 3000 jint result = set_aggressive_heap_flags(); 3001 if (result != JNI_OK) { 3002 return result; 3003 } 3004 } 3005 3006 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3007 // but like -Xint, leave compilation thresholds unaffected. 3008 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3009 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3010 set_mode_flags(_int); 3011 } 3012 3013 #ifdef ZERO 3014 // Zero always runs in interpreted mode 3015 set_mode_flags(_int); 3016 #endif 3017 3018 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3019 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3020 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3021 } 3022 3023 #if !COMPILER2_OR_JVMCI 3024 // Don't degrade server performance for footprint 3025 if (FLAG_IS_DEFAULT(UseLargePages) && 3026 MaxHeapSize < LargePageHeapSizeThreshold) { 3027 // No need for large granularity pages w/small heaps. 3028 // Note that large pages are enabled/disabled for both the 3029 // Java heap and the code cache. 3030 FLAG_SET_DEFAULT(UseLargePages, false); 3031 } 3032 3033 UNSUPPORTED_OPTION(ProfileInterpreter); 3034 #endif 3035 3036 // Parse the CompilationMode flag 3037 if (!CompilationModeFlag::initialize()) { 3038 return JNI_ERR; 3039 } 3040 3041 if (!check_vm_args_consistency()) { 3042 return JNI_ERR; 3043 } 3044 3045 #if INCLUDE_CDS 3046 if (DumpSharedSpaces) { 3047 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3048 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable 3049 // compiler just to be safe. 3050 // 3051 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the 3052 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler. 3053 // TODO: revisit the following for the static archive case. 3054 set_mode_flags(_int); 3055 3056 // String deduplication may cause CDS to iterate the strings in different order from one 3057 // run to another which resulting in non-determinstic CDS archives. 3058 // Disable UseStringDeduplication while dumping CDS archive. 3059 UseStringDeduplication = false; 3060 } 3061 3062 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit 3063 if (ArchiveClassesAtExit != nullptr && RecordDynamicDumpInfo) { 3064 jio_fprintf(defaultStream::output_stream(), 3065 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n"); 3066 return JNI_ERR; 3067 } 3068 3069 if (ArchiveClassesAtExit == nullptr && !RecordDynamicDumpInfo) { 3070 DynamicDumpSharedSpaces = false; 3071 } else { 3072 DynamicDumpSharedSpaces = true; 3073 } 3074 3075 if (AutoCreateSharedArchive) { 3076 if (SharedArchiveFile == nullptr) { 3077 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile"); 3078 return JNI_ERR; 3079 } 3080 if (ArchiveClassesAtExit != nullptr) { 3081 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit"); 3082 return JNI_ERR; 3083 } 3084 } 3085 3086 if (UseSharedSpaces && patch_mod_javabase) { 3087 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3088 } 3089 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3090 UseSharedSpaces = false; 3091 } 3092 3093 if (DumpSharedSpaces || DynamicDumpSharedSpaces) { 3094 // Always verify non-system classes during CDS dump 3095 if (!BytecodeVerificationRemote) { 3096 BytecodeVerificationRemote = true; 3097 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3098 } 3099 } 3100 #endif 3101 3102 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3103 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3104 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3105 3106 return JNI_OK; 3107 } 3108 3109 // Helper class for controlling the lifetime of JavaVMInitArgs 3110 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3111 // deleted on the destruction of the ScopedVMInitArgs object. 3112 class ScopedVMInitArgs : public StackObj { 3113 private: 3114 JavaVMInitArgs _args; 3115 char* _container_name; 3116 bool _is_set; 3117 char* _vm_options_file_arg; 3118 3119 public: 3120 ScopedVMInitArgs(const char *container_name) { 3121 _args.version = JNI_VERSION_1_2; 3122 _args.nOptions = 0; 3123 _args.options = nullptr; 3124 _args.ignoreUnrecognized = false; 3125 _container_name = (char *)container_name; 3126 _is_set = false; 3127 _vm_options_file_arg = nullptr; 3128 } 3129 3130 // Populates the JavaVMInitArgs object represented by this 3131 // ScopedVMInitArgs object with the arguments in options. The 3132 // allocated memory is deleted by the destructor. If this method 3133 // returns anything other than JNI_OK, then this object is in a 3134 // partially constructed state, and should be abandoned. 3135 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3136 _is_set = true; 3137 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3138 JavaVMOption, options->length(), mtArguments); 3139 if (options_arr == nullptr) { 3140 return JNI_ENOMEM; 3141 } 3142 _args.options = options_arr; 3143 3144 for (int i = 0; i < options->length(); i++) { 3145 options_arr[i] = options->at(i); 3146 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3147 if (options_arr[i].optionString == nullptr) { 3148 // Rely on the destructor to do cleanup. 3149 _args.nOptions = i; 3150 return JNI_ENOMEM; 3151 } 3152 } 3153 3154 _args.nOptions = options->length(); 3155 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3156 return JNI_OK; 3157 } 3158 3159 JavaVMInitArgs* get() { return &_args; } 3160 char* container_name() { return _container_name; } 3161 bool is_set() { return _is_set; } 3162 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; } 3163 char* vm_options_file_arg() { return _vm_options_file_arg; } 3164 3165 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3166 if (_vm_options_file_arg != nullptr) { 3167 os::free(_vm_options_file_arg); 3168 } 3169 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3170 } 3171 3172 ~ScopedVMInitArgs() { 3173 if (_vm_options_file_arg != nullptr) { 3174 os::free(_vm_options_file_arg); 3175 } 3176 if (_args.options == nullptr) return; 3177 for (int i = 0; i < _args.nOptions; i++) { 3178 os::free(_args.options[i].optionString); 3179 } 3180 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3181 } 3182 3183 // Insert options into this option list, to replace option at 3184 // vm_options_file_pos (-XX:VMOptionsFile) 3185 jint insert(const JavaVMInitArgs* args, 3186 const JavaVMInitArgs* args_to_insert, 3187 const int vm_options_file_pos) { 3188 assert(_args.options == nullptr, "shouldn't be set yet"); 3189 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3190 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3191 3192 int length = args->nOptions + args_to_insert->nOptions - 1; 3193 // Construct new option array 3194 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3195 for (int i = 0; i < args->nOptions; i++) { 3196 if (i == vm_options_file_pos) { 3197 // insert the new options starting at the same place as the 3198 // -XX:VMOptionsFile option 3199 for (int j = 0; j < args_to_insert->nOptions; j++) { 3200 options.push(args_to_insert->options[j]); 3201 } 3202 } else { 3203 options.push(args->options[i]); 3204 } 3205 } 3206 // make into options array 3207 return set_args(&options); 3208 } 3209 }; 3210 3211 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3212 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3213 } 3214 3215 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3216 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3217 } 3218 3219 jint Arguments::parse_options_environment_variable(const char* name, 3220 ScopedVMInitArgs* vm_args) { 3221 char *buffer = ::getenv(name); 3222 3223 // Don't check this environment variable if user has special privileges 3224 // (e.g. unix su command). 3225 if (buffer == nullptr || os::have_special_privileges()) { 3226 return JNI_OK; 3227 } 3228 3229 if ((buffer = os::strdup(buffer)) == nullptr) { 3230 return JNI_ENOMEM; 3231 } 3232 3233 jio_fprintf(defaultStream::error_stream(), 3234 "Picked up %s: %s\n", name, buffer); 3235 3236 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3237 3238 os::free(buffer); 3239 return retcode; 3240 } 3241 3242 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3243 // read file into buffer 3244 int fd = ::open(file_name, O_RDONLY); 3245 if (fd < 0) { 3246 jio_fprintf(defaultStream::error_stream(), 3247 "Could not open options file '%s'\n", 3248 file_name); 3249 return JNI_ERR; 3250 } 3251 3252 struct stat stbuf; 3253 int retcode = os::stat(file_name, &stbuf); 3254 if (retcode != 0) { 3255 jio_fprintf(defaultStream::error_stream(), 3256 "Could not stat options file '%s'\n", 3257 file_name); 3258 ::close(fd); 3259 return JNI_ERR; 3260 } 3261 3262 if (stbuf.st_size == 0) { 3263 // tell caller there is no option data and that is ok 3264 ::close(fd); 3265 return JNI_OK; 3266 } 3267 3268 // '+ 1' for null termination even with max bytes 3269 size_t bytes_alloc = stbuf.st_size + 1; 3270 3271 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3272 if (nullptr == buf) { 3273 jio_fprintf(defaultStream::error_stream(), 3274 "Could not allocate read buffer for options file parse\n"); 3275 ::close(fd); 3276 return JNI_ENOMEM; 3277 } 3278 3279 memset(buf, 0, bytes_alloc); 3280 3281 // Fill buffer 3282 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3283 ::close(fd); 3284 if (bytes_read < 0) { 3285 FREE_C_HEAP_ARRAY(char, buf); 3286 jio_fprintf(defaultStream::error_stream(), 3287 "Could not read options file '%s'\n", file_name); 3288 return JNI_ERR; 3289 } 3290 3291 if (bytes_read == 0) { 3292 // tell caller there is no option data and that is ok 3293 FREE_C_HEAP_ARRAY(char, buf); 3294 return JNI_OK; 3295 } 3296 3297 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3298 3299 FREE_C_HEAP_ARRAY(char, buf); 3300 return retcode; 3301 } 3302 3303 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3304 // Construct option array 3305 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3306 3307 // some pointers to help with parsing 3308 char *buffer_end = buffer + buf_len; 3309 char *opt_hd = buffer; 3310 char *wrt = buffer; 3311 char *rd = buffer; 3312 3313 // parse all options 3314 while (rd < buffer_end) { 3315 // skip leading white space from the input string 3316 while (rd < buffer_end && isspace(*rd)) { 3317 rd++; 3318 } 3319 3320 if (rd >= buffer_end) { 3321 break; 3322 } 3323 3324 // Remember this is where we found the head of the token. 3325 opt_hd = wrt; 3326 3327 // Tokens are strings of non white space characters separated 3328 // by one or more white spaces. 3329 while (rd < buffer_end && !isspace(*rd)) { 3330 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3331 int quote = *rd; // matching quote to look for 3332 rd++; // don't copy open quote 3333 while (rd < buffer_end && *rd != quote) { 3334 // include everything (even spaces) 3335 // up until the close quote 3336 *wrt++ = *rd++; // copy to option string 3337 } 3338 3339 if (rd < buffer_end) { 3340 rd++; // don't copy close quote 3341 } else { 3342 // did not see closing quote 3343 jio_fprintf(defaultStream::error_stream(), 3344 "Unmatched quote in %s\n", name); 3345 return JNI_ERR; 3346 } 3347 } else { 3348 *wrt++ = *rd++; // copy to option string 3349 } 3350 } 3351 3352 // steal a white space character and set it to null 3353 *wrt++ = '\0'; 3354 // We now have a complete token 3355 3356 JavaVMOption option; 3357 option.optionString = opt_hd; 3358 option.extraInfo = nullptr; 3359 3360 options.append(option); // Fill in option 3361 3362 rd++; // Advance to next character 3363 } 3364 3365 // Fill out JavaVMInitArgs structure. 3366 return vm_args->set_args(&options); 3367 } 3368 3369 void Arguments::set_shared_spaces_flags_and_archive_paths() { 3370 if (DumpSharedSpaces) { 3371 if (RequireSharedSpaces) { 3372 warning("Cannot dump shared archive while using shared archive"); 3373 } 3374 UseSharedSpaces = false; 3375 } 3376 #if INCLUDE_CDS 3377 // Initialize shared archive paths which could include both base and dynamic archive paths 3378 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly. 3379 // 3380 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid. 3381 if (DumpSharedSpaces || UseSharedSpaces) { 3382 init_shared_archive_paths(); 3383 } 3384 #endif // INCLUDE_CDS 3385 } 3386 3387 #if INCLUDE_CDS 3388 // Sharing support 3389 // Construct the path to the archive 3390 char* Arguments::get_default_shared_archive_path() { 3391 if (_default_shared_archive_path == nullptr) { 3392 char jvm_path[JVM_MAXPATHLEN]; 3393 os::jvm_path(jvm_path, sizeof(jvm_path)); 3394 char *end = strrchr(jvm_path, *os::file_separator()); 3395 if (end != nullptr) *end = '\0'; 3396 size_t jvm_path_len = strlen(jvm_path); 3397 size_t file_sep_len = strlen(os::file_separator()); 3398 const size_t len = jvm_path_len + file_sep_len + 20; 3399 _default_shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3400 jio_snprintf(_default_shared_archive_path, len, 3401 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa", 3402 jvm_path, os::file_separator()); 3403 } 3404 return _default_shared_archive_path; 3405 } 3406 3407 int Arguments::num_archives(const char* archive_path) { 3408 if (archive_path == nullptr) { 3409 return 0; 3410 } 3411 int npaths = 1; 3412 char* p = (char*)archive_path; 3413 while (*p != '\0') { 3414 if (*p == os::path_separator()[0]) { 3415 npaths++; 3416 } 3417 p++; 3418 } 3419 return npaths; 3420 } 3421 3422 void Arguments::extract_shared_archive_paths(const char* archive_path, 3423 char** base_archive_path, 3424 char** top_archive_path) { 3425 char* begin_ptr = (char*)archive_path; 3426 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3427 if (end_ptr == nullptr || end_ptr == begin_ptr) { 3428 vm_exit_during_initialization("Base archive was not specified", archive_path); 3429 } 3430 size_t len = end_ptr - begin_ptr; 3431 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3432 strncpy(cur_path, begin_ptr, len); 3433 cur_path[len] = '\0'; 3434 *base_archive_path = cur_path; 3435 3436 begin_ptr = ++end_ptr; 3437 if (*begin_ptr == '\0') { 3438 vm_exit_during_initialization("Top archive was not specified", archive_path); 3439 } 3440 end_ptr = strchr(begin_ptr, '\0'); 3441 assert(end_ptr != nullptr, "sanity"); 3442 len = end_ptr - begin_ptr; 3443 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3444 strncpy(cur_path, begin_ptr, len + 1); 3445 *top_archive_path = cur_path; 3446 } 3447 3448 void Arguments::init_shared_archive_paths() { 3449 if (ArchiveClassesAtExit != nullptr) { 3450 assert(!RecordDynamicDumpInfo, "already checked"); 3451 if (DumpSharedSpaces) { 3452 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3453 } 3454 check_unsupported_dumping_properties(); 3455 3456 if (os::same_files(get_default_shared_archive_path(), ArchiveClassesAtExit)) { 3457 vm_exit_during_initialization( 3458 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path()); 3459 } 3460 } 3461 3462 if (SharedArchiveFile == nullptr) { 3463 SharedArchivePath = get_default_shared_archive_path(); 3464 } else { 3465 int archives = num_archives(SharedArchiveFile); 3466 assert(archives > 0, "must be"); 3467 3468 if (is_dumping_archive() && archives > 1) { 3469 vm_exit_during_initialization( 3470 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3471 } 3472 3473 if (DumpSharedSpaces) { 3474 assert(archives == 1, "must be"); 3475 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file 3476 // will be overwritten no matter regardless of its contents 3477 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3478 } else { 3479 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa 3480 // is read from top.jsa 3481 // (a) 1 file: -XX:SharedArchiveFile=base.jsa 3482 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa 3483 // (c) 2 files: -XX:SharedArchiveFile=top.jsa 3484 // 3485 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not 3486 // allow cases (b) and (c). Case (b) is already checked above. 3487 3488 if (archives > 2) { 3489 vm_exit_during_initialization( 3490 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3491 } 3492 if (archives == 1) { 3493 char* base_archive_path = nullptr; 3494 bool success = 3495 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path); 3496 if (!success) { 3497 // If +AutoCreateSharedArchive and the specified shared archive does not exist, 3498 // regenerate the dynamic archive base on default archive. 3499 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) { 3500 DynamicDumpSharedSpaces = true; 3501 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile); 3502 SharedArchivePath = get_default_shared_archive_path(); 3503 SharedArchiveFile = nullptr; 3504 } else { 3505 if (AutoCreateSharedArchive) { 3506 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info."); 3507 AutoCreateSharedArchive = false; 3508 } 3509 no_shared_spaces("invalid archive"); 3510 } 3511 } else if (base_archive_path == nullptr) { 3512 // User has specified a single archive, which is a static archive. 3513 SharedArchivePath = const_cast<char *>(SharedArchiveFile); 3514 } else { 3515 // User has specified a single archive, which is a dynamic archive. 3516 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile); 3517 SharedArchivePath = base_archive_path; // has been c-heap allocated. 3518 } 3519 } else { 3520 extract_shared_archive_paths((const char*)SharedArchiveFile, 3521 &SharedArchivePath, &SharedDynamicArchivePath); 3522 if (SharedArchivePath == nullptr) { 3523 assert(SharedDynamicArchivePath == nullptr, "must be"); 3524 no_shared_spaces("invalid archive"); 3525 } 3526 } 3527 3528 if (SharedDynamicArchivePath != nullptr) { 3529 // Check for case (c) 3530 if (RecordDynamicDumpInfo) { 3531 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3532 SharedArchiveFile); 3533 } 3534 if (ArchiveClassesAtExit != nullptr) { 3535 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3536 SharedArchiveFile); 3537 } 3538 } 3539 3540 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3541 vm_exit_during_initialization( 3542 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3543 SharedArchiveFile); 3544 } 3545 } 3546 } 3547 } 3548 #endif // INCLUDE_CDS 3549 3550 #ifndef PRODUCT 3551 // Determine whether LogVMOutput should be implicitly turned on. 3552 static bool use_vm_log() { 3553 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3554 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3555 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3556 PrintAssembly || TraceDeoptimization || 3557 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3558 return true; 3559 } 3560 3561 #ifdef COMPILER1 3562 if (PrintC1Statistics) { 3563 return true; 3564 } 3565 #endif // COMPILER1 3566 3567 #ifdef COMPILER2 3568 if (PrintOptoAssembly || PrintOptoStatistics) { 3569 return true; 3570 } 3571 #endif // COMPILER2 3572 3573 return false; 3574 } 3575 3576 #endif // PRODUCT 3577 3578 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3579 for (int index = 0; index < args->nOptions; index++) { 3580 const JavaVMOption* option = args->options + index; 3581 const char* tail; 3582 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3583 return true; 3584 } 3585 } 3586 return false; 3587 } 3588 3589 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3590 const char* vm_options_file, 3591 const int vm_options_file_pos, 3592 ScopedVMInitArgs* vm_options_file_args, 3593 ScopedVMInitArgs* args_out) { 3594 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3595 if (code != JNI_OK) { 3596 return code; 3597 } 3598 3599 if (vm_options_file_args->get()->nOptions < 1) { 3600 return JNI_OK; 3601 } 3602 3603 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3604 jio_fprintf(defaultStream::error_stream(), 3605 "A VM options file may not refer to a VM options file. " 3606 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3607 "options file '%s' in options container '%s' is an error.\n", 3608 vm_options_file_args->vm_options_file_arg(), 3609 vm_options_file_args->container_name()); 3610 return JNI_EINVAL; 3611 } 3612 3613 return args_out->insert(args, vm_options_file_args->get(), 3614 vm_options_file_pos); 3615 } 3616 3617 // Expand -XX:VMOptionsFile found in args_in as needed. 3618 // mod_args and args_out parameters may return values as needed. 3619 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3620 ScopedVMInitArgs* mod_args, 3621 JavaVMInitArgs** args_out) { 3622 jint code = match_special_option_and_act(args_in, mod_args); 3623 if (code != JNI_OK) { 3624 return code; 3625 } 3626 3627 if (mod_args->is_set()) { 3628 // args_in contains -XX:VMOptionsFile and mod_args contains the 3629 // original options from args_in along with the options expanded 3630 // from the VMOptionsFile. Return a short-hand to the caller. 3631 *args_out = mod_args->get(); 3632 } else { 3633 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3634 } 3635 return JNI_OK; 3636 } 3637 3638 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3639 ScopedVMInitArgs* args_out) { 3640 // Remaining part of option string 3641 const char* tail; 3642 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3643 3644 for (int index = 0; index < args->nOptions; index++) { 3645 const JavaVMOption* option = args->options + index; 3646 if (match_option(option, "-XX:Flags=", &tail)) { 3647 Arguments::set_jvm_flags_file(tail); 3648 continue; 3649 } 3650 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3651 if (vm_options_file_args.found_vm_options_file_arg()) { 3652 jio_fprintf(defaultStream::error_stream(), 3653 "The option '%s' is already specified in the options " 3654 "container '%s' so the specification of '%s' in the " 3655 "same options container is an error.\n", 3656 vm_options_file_args.vm_options_file_arg(), 3657 vm_options_file_args.container_name(), 3658 option->optionString); 3659 return JNI_EINVAL; 3660 } 3661 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3662 // If there's a VMOptionsFile, parse that 3663 jint code = insert_vm_options_file(args, tail, index, 3664 &vm_options_file_args, args_out); 3665 if (code != JNI_OK) { 3666 return code; 3667 } 3668 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3669 if (args_out->is_set()) { 3670 // The VMOptions file inserted some options so switch 'args' 3671 // to the new set of options, and continue processing which 3672 // preserves "last option wins" semantics. 3673 args = args_out->get(); 3674 // The first option from the VMOptionsFile replaces the 3675 // current option. So we back track to process the 3676 // replacement option. 3677 index--; 3678 } 3679 continue; 3680 } 3681 if (match_option(option, "-XX:+PrintVMOptions")) { 3682 PrintVMOptions = true; 3683 continue; 3684 } 3685 if (match_option(option, "-XX:-PrintVMOptions")) { 3686 PrintVMOptions = false; 3687 continue; 3688 } 3689 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3690 IgnoreUnrecognizedVMOptions = true; 3691 continue; 3692 } 3693 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3694 IgnoreUnrecognizedVMOptions = false; 3695 continue; 3696 } 3697 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3698 JVMFlag::printFlags(tty, false); 3699 vm_exit(0); 3700 } 3701 3702 #ifndef PRODUCT 3703 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3704 JVMFlag::printFlags(tty, true); 3705 vm_exit(0); 3706 } 3707 #endif 3708 } 3709 return JNI_OK; 3710 } 3711 3712 static void print_options(const JavaVMInitArgs *args) { 3713 const char* tail; 3714 for (int index = 0; index < args->nOptions; index++) { 3715 const JavaVMOption *option = args->options + index; 3716 if (match_option(option, "-XX:", &tail)) { 3717 logOption(tail); 3718 } 3719 } 3720 } 3721 3722 bool Arguments::handle_deprecated_print_gc_flags() { 3723 if (PrintGC) { 3724 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3725 } 3726 if (PrintGCDetails) { 3727 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3728 } 3729 3730 if (_legacyGCLogging.lastFlag == 2) { 3731 // -Xloggc was used to specify a filename 3732 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3733 3734 LogTarget(Error, logging) target; 3735 LogStream errstream(target); 3736 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream); 3737 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3738 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3739 } 3740 return true; 3741 } 3742 3743 static void apply_debugger_ergo() { 3744 #ifndef PRODUCT 3745 // UseDebuggerErgo is notproduct 3746 if (ReplayCompiles) { 3747 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3748 } 3749 #endif 3750 3751 #ifndef PRODUCT 3752 if (UseDebuggerErgo) { 3753 // Turn on sub-flags 3754 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3755 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3756 } 3757 #endif 3758 3759 if (UseDebuggerErgo2) { 3760 // Debugging with limited number of CPUs 3761 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3762 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3763 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3764 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3765 } 3766 } 3767 3768 // Parse entry point called from JNI_CreateJavaVM 3769 3770 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3771 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3772 JVMFlag::check_all_flag_declarations(); 3773 3774 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3775 const char* hotspotrc = ".hotspotrc"; 3776 bool settings_file_specified = false; 3777 bool needs_hotspotrc_warning = false; 3778 ScopedVMInitArgs initial_vm_options_args(""); 3779 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3780 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3781 3782 // Pointers to current working set of containers 3783 JavaVMInitArgs* cur_cmd_args; 3784 JavaVMInitArgs* cur_vm_options_args; 3785 JavaVMInitArgs* cur_java_options_args; 3786 JavaVMInitArgs* cur_java_tool_options_args; 3787 3788 // Containers for modified/expanded options 3789 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3790 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3791 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3792 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3793 3794 3795 jint code = 3796 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3797 if (code != JNI_OK) { 3798 return code; 3799 } 3800 3801 code = parse_java_options_environment_variable(&initial_java_options_args); 3802 if (code != JNI_OK) { 3803 return code; 3804 } 3805 3806 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3807 char *vmoptions = ClassLoader::lookup_vm_options(); 3808 if (vmoptions != nullptr) { 3809 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3810 FREE_C_HEAP_ARRAY(char, vmoptions); 3811 if (code != JNI_OK) { 3812 return code; 3813 } 3814 } 3815 3816 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3817 &mod_java_tool_options_args, 3818 &cur_java_tool_options_args); 3819 if (code != JNI_OK) { 3820 return code; 3821 } 3822 3823 code = expand_vm_options_as_needed(initial_cmd_args, 3824 &mod_cmd_args, 3825 &cur_cmd_args); 3826 if (code != JNI_OK) { 3827 return code; 3828 } 3829 3830 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3831 &mod_java_options_args, 3832 &cur_java_options_args); 3833 if (code != JNI_OK) { 3834 return code; 3835 } 3836 3837 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3838 &mod_vm_options_args, 3839 &cur_vm_options_args); 3840 if (code != JNI_OK) { 3841 return code; 3842 } 3843 3844 const char* flags_file = Arguments::get_jvm_flags_file(); 3845 settings_file_specified = (flags_file != nullptr); 3846 3847 if (IgnoreUnrecognizedVMOptions) { 3848 cur_cmd_args->ignoreUnrecognized = true; 3849 cur_java_tool_options_args->ignoreUnrecognized = true; 3850 cur_java_options_args->ignoreUnrecognized = true; 3851 } 3852 3853 // Parse specified settings file 3854 if (settings_file_specified) { 3855 if (!process_settings_file(flags_file, true, 3856 cur_cmd_args->ignoreUnrecognized)) { 3857 return JNI_EINVAL; 3858 } 3859 } else { 3860 #ifdef ASSERT 3861 // Parse default .hotspotrc settings file 3862 if (!process_settings_file(".hotspotrc", false, 3863 cur_cmd_args->ignoreUnrecognized)) { 3864 return JNI_EINVAL; 3865 } 3866 #else 3867 struct stat buf; 3868 if (os::stat(hotspotrc, &buf) == 0) { 3869 needs_hotspotrc_warning = true; 3870 } 3871 #endif 3872 } 3873 3874 if (PrintVMOptions) { 3875 print_options(cur_java_tool_options_args); 3876 print_options(cur_cmd_args); 3877 print_options(cur_java_options_args); 3878 } 3879 3880 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3881 jint result = parse_vm_init_args(cur_vm_options_args, 3882 cur_java_tool_options_args, 3883 cur_java_options_args, 3884 cur_cmd_args); 3885 3886 if (result != JNI_OK) { 3887 return result; 3888 } 3889 3890 // Delay warning until here so that we've had a chance to process 3891 // the -XX:-PrintWarnings flag 3892 if (needs_hotspotrc_warning) { 3893 warning("%s file is present but has been ignored. " 3894 "Run with -XX:Flags=%s to load the file.", 3895 hotspotrc, hotspotrc); 3896 } 3897 3898 if (needs_module_property_warning) { 3899 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3900 " names that are reserved for internal use."); 3901 } 3902 3903 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3904 UNSUPPORTED_OPTION(UseLargePages); 3905 #endif 3906 3907 #if defined(AIX) 3908 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3909 #endif 3910 3911 #ifndef PRODUCT 3912 if (TraceBytecodesAt != 0) { 3913 TraceBytecodes = true; 3914 } 3915 if (CountCompiledCalls) { 3916 if (UseCounterDecay) { 3917 warning("UseCounterDecay disabled because CountCalls is set"); 3918 UseCounterDecay = false; 3919 } 3920 } 3921 #endif // PRODUCT 3922 3923 if (ScavengeRootsInCode == 0) { 3924 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3925 warning("Forcing ScavengeRootsInCode non-zero"); 3926 } 3927 ScavengeRootsInCode = 1; 3928 } 3929 3930 if (!handle_deprecated_print_gc_flags()) { 3931 return JNI_EINVAL; 3932 } 3933 3934 // Set object alignment values. 3935 set_object_alignment(); 3936 3937 #if !INCLUDE_CDS 3938 if (DumpSharedSpaces || RequireSharedSpaces) { 3939 jio_fprintf(defaultStream::error_stream(), 3940 "Shared spaces are not supported in this VM\n"); 3941 return JNI_ERR; 3942 } 3943 if (DumpLoadedClassList != nullptr) { 3944 jio_fprintf(defaultStream::error_stream(), 3945 "DumpLoadedClassList is not supported in this VM\n"); 3946 return JNI_ERR; 3947 } 3948 if ((UseSharedSpaces && xshare_auto_cmd_line) || 3949 log_is_enabled(Info, cds)) { 3950 warning("Shared spaces are not supported in this VM"); 3951 UseSharedSpaces = false; 3952 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3953 } 3954 no_shared_spaces("CDS Disabled"); 3955 #endif // INCLUDE_CDS 3956 3957 // Verify NMT arguments 3958 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 3959 if (lvl == NMT_unknown) { 3960 jio_fprintf(defaultStream::error_stream(), 3961 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", nullptr); 3962 return JNI_ERR; 3963 } 3964 if (PrintNMTStatistics && lvl == NMT_off) { 3965 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 3966 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 3967 } 3968 3969 bool trace_dependencies = log_is_enabled(Debug, dependencies); 3970 if (trace_dependencies && VerifyDependencies) { 3971 warning("dependency logging results may be inflated by VerifyDependencies"); 3972 } 3973 3974 apply_debugger_ergo(); 3975 3976 if (log_is_enabled(Info, arguments)) { 3977 LogStream st(Log(arguments)::info()); 3978 Arguments::print_on(&st); 3979 } 3980 3981 return JNI_OK; 3982 } 3983 3984 jint Arguments::apply_ergo() { 3985 // Set flags based on ergonomics. 3986 jint result = set_ergonomics_flags(); 3987 if (result != JNI_OK) return result; 3988 3989 // Set heap size based on available physical memory 3990 set_heap_size(); 3991 3992 GCConfig::arguments()->initialize(); 3993 3994 set_shared_spaces_flags_and_archive_paths(); 3995 3996 // Initialize Metaspace flags and alignments 3997 Metaspace::ergo_initialize(); 3998 3999 if (!StringDedup::ergo_initialize()) { 4000 return JNI_EINVAL; 4001 } 4002 4003 // Set compiler flags after GC is selected and GC specific 4004 // flags (LoopStripMiningIter) are set. 4005 CompilerConfig::ergo_initialize(); 4006 4007 // Set bytecode rewriting flags 4008 set_bytecode_flags(); 4009 4010 // Set flags if aggressive optimization flags are enabled 4011 jint code = set_aggressive_opts_flags(); 4012 if (code != JNI_OK) { 4013 return code; 4014 } 4015 4016 #ifdef ZERO 4017 // Clear flags not supported on zero. 4018 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4019 #endif // ZERO 4020 4021 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4022 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4023 DebugNonSafepoints = true; 4024 } 4025 4026 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4027 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4028 } 4029 4030 // Treat the odd case where local verification is enabled but remote 4031 // verification is not as if both were enabled. 4032 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4033 log_info(verification)("Turning on remote verification because local verification is on"); 4034 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4035 } 4036 4037 #ifndef PRODUCT 4038 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4039 if (use_vm_log()) { 4040 LogVMOutput = true; 4041 } 4042 } 4043 #endif // PRODUCT 4044 4045 if (PrintCommandLineFlags) { 4046 JVMFlag::printSetFlags(tty); 4047 } 4048 4049 #ifdef COMPILER2 4050 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 4051 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 4052 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 4053 } 4054 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 4055 4056 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 4057 if (!EnableVectorReboxing) { 4058 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 4059 } else { 4060 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 4061 } 4062 } 4063 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 4064 4065 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 4066 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 4067 } 4068 FLAG_SET_DEFAULT(UseVectorStubs, false); 4069 } 4070 #endif // COMPILER2 4071 4072 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 4073 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 4074 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 4075 } 4076 } 4077 return JNI_OK; 4078 } 4079 4080 jint Arguments::adjust_after_os() { 4081 if (UseNUMA) { 4082 if (UseParallelGC) { 4083 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4084 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4085 } 4086 } 4087 } 4088 return JNI_OK; 4089 } 4090 4091 int Arguments::PropertyList_count(SystemProperty* pl) { 4092 int count = 0; 4093 while(pl != nullptr) { 4094 count++; 4095 pl = pl->next(); 4096 } 4097 return count; 4098 } 4099 4100 // Return the number of readable properties. 4101 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4102 int count = 0; 4103 while(pl != nullptr) { 4104 if (pl->readable()) { 4105 count++; 4106 } 4107 pl = pl->next(); 4108 } 4109 return count; 4110 } 4111 4112 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4113 assert(key != nullptr, "just checking"); 4114 SystemProperty* prop; 4115 for (prop = pl; prop != nullptr; prop = prop->next()) { 4116 if (strcmp(key, prop->key()) == 0) return prop->value(); 4117 } 4118 return nullptr; 4119 } 4120 4121 // Return the value of the requested property provided that it is a readable property. 4122 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4123 assert(key != nullptr, "just checking"); 4124 SystemProperty* prop; 4125 // Return the property value if the keys match and the property is not internal or 4126 // it's the special internal property "jdk.boot.class.path.append". 4127 for (prop = pl; prop != nullptr; prop = prop->next()) { 4128 if (strcmp(key, prop->key()) == 0) { 4129 if (!prop->internal()) { 4130 return prop->value(); 4131 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4132 return prop->value(); 4133 } else { 4134 // Property is internal and not jdk.boot.class.path.append so return null. 4135 return nullptr; 4136 } 4137 } 4138 } 4139 return nullptr; 4140 } 4141 4142 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4143 SystemProperty* p = *plist; 4144 if (p == nullptr) { 4145 *plist = new_p; 4146 } else { 4147 while (p->next() != nullptr) { 4148 p = p->next(); 4149 } 4150 p->set_next(new_p); 4151 } 4152 } 4153 4154 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4155 bool writeable, bool internal) { 4156 if (plist == nullptr) 4157 return; 4158 4159 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4160 PropertyList_add(plist, new_p); 4161 } 4162 4163 void Arguments::PropertyList_add(SystemProperty *element) { 4164 PropertyList_add(&_system_properties, element); 4165 } 4166 4167 // This add maintains unique property key in the list. 4168 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4169 PropertyAppendable append, PropertyWriteable writeable, 4170 PropertyInternal internal) { 4171 if (plist == nullptr) 4172 return; 4173 4174 // If property key exists and is writeable, then update with new value. 4175 // Trying to update a non-writeable property is silently ignored. 4176 SystemProperty* prop; 4177 for (prop = *plist; prop != nullptr; prop = prop->next()) { 4178 if (strcmp(k, prop->key()) == 0) { 4179 if (append == AppendProperty) { 4180 prop->append_writeable_value(v); 4181 } else { 4182 prop->set_writeable_value(v); 4183 } 4184 return; 4185 } 4186 } 4187 4188 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4189 } 4190 4191 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4192 // Returns true if all of the source pointed by src has been copied over to 4193 // the destination buffer pointed by buf. Otherwise, returns false. 4194 // Notes: 4195 // 1. If the length (buflen) of the destination buffer excluding the 4196 // null terminator character is not long enough for holding the expanded 4197 // pid characters, it also returns false instead of returning the partially 4198 // expanded one. 4199 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4200 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4201 char* buf, size_t buflen) { 4202 const char* p = src; 4203 char* b = buf; 4204 const char* src_end = &src[srclen]; 4205 char* buf_end = &buf[buflen - 1]; 4206 4207 while (p < src_end && b < buf_end) { 4208 if (*p == '%') { 4209 switch (*(++p)) { 4210 case '%': // "%%" ==> "%" 4211 *b++ = *p++; 4212 break; 4213 case 'p': { // "%p" ==> current process id 4214 // buf_end points to the character before the last character so 4215 // that we could write '\0' to the end of the buffer. 4216 size_t buf_sz = buf_end - b + 1; 4217 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4218 4219 // if jio_snprintf fails or the buffer is not long enough to hold 4220 // the expanded pid, returns false. 4221 if (ret < 0 || ret >= (int)buf_sz) { 4222 return false; 4223 } else { 4224 b += ret; 4225 assert(*b == '\0', "fail in copy_expand_pid"); 4226 if (p == src_end && b == buf_end + 1) { 4227 // reach the end of the buffer. 4228 return true; 4229 } 4230 } 4231 p++; 4232 break; 4233 } 4234 default : 4235 *b++ = '%'; 4236 } 4237 } else { 4238 *b++ = *p++; 4239 } 4240 } 4241 *b = '\0'; 4242 return (p == src_end); // return false if not all of the source was copied 4243 }