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/compressedKlass.hpp" 45 #include "oops/instanceKlass.hpp" 46 #include "oops/oop.inline.hpp" 47 #include "prims/jvmtiAgentList.hpp" 48 #include "prims/jvmtiExport.hpp" 49 #include "runtime/arguments.hpp" 50 #include "runtime/flags/jvmFlag.hpp" 51 #include "runtime/flags/jvmFlagAccess.hpp" 52 #include "runtime/flags/jvmFlagLimit.hpp" 53 #include "runtime/globals_extension.hpp" 54 #include "runtime/java.hpp" 55 #include "runtime/os.hpp" 56 #include "runtime/safepoint.hpp" 57 #include "runtime/safepointMechanism.hpp" 58 #include "runtime/synchronizer.hpp" 59 #include "runtime/vm_version.hpp" 60 #include "services/management.hpp" 61 #include "services/nmtCommon.hpp" 62 #include "utilities/align.hpp" 63 #include "utilities/debug.hpp" 64 #include "utilities/defaultStream.hpp" 65 #include "utilities/macros.hpp" 66 #include "utilities/parseInteger.hpp" 67 #include "utilities/powerOfTwo.hpp" 68 #include "utilities/stringUtils.hpp" 69 #include "utilities/systemMemoryBarrier.hpp" 70 #if INCLUDE_JFR 71 #include "jfr/jfr.hpp" 72 #endif 73 74 #include <limits> 75 #include <string.h> 76 77 static const char _default_java_launcher[] = "generic"; 78 79 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher 80 81 char* Arguments::_jvm_flags_file = nullptr; 82 char** Arguments::_jvm_flags_array = nullptr; 83 int Arguments::_num_jvm_flags = 0; 84 char** Arguments::_jvm_args_array = nullptr; 85 int Arguments::_num_jvm_args = 0; 86 char* Arguments::_java_command = nullptr; 87 SystemProperty* Arguments::_system_properties = nullptr; 88 size_t Arguments::_conservative_max_heap_alignment = 0; 89 Arguments::Mode Arguments::_mode = _mixed; 90 const char* Arguments::_java_vendor_url_bug = nullptr; 91 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 92 bool Arguments::_sun_java_launcher_is_altjvm = false; 93 94 // These parameters are reset in method parse_vm_init_args() 95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 97 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 98 bool Arguments::_ClipInlining = ClipInlining; 99 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 100 101 bool Arguments::_enable_preview = false; 102 103 char* Arguments::_default_shared_archive_path = nullptr; 104 char* Arguments::SharedArchivePath = nullptr; 105 char* Arguments::SharedDynamicArchivePath = nullptr; 106 107 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 }; 108 109 // These are not set by the JDK's built-in launchers, but they can be set by 110 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 111 // JavaVMOption in jni.h. 112 abort_hook_t Arguments::_abort_hook = nullptr; 113 exit_hook_t Arguments::_exit_hook = nullptr; 114 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr; 115 116 117 SystemProperty *Arguments::_sun_boot_library_path = nullptr; 118 SystemProperty *Arguments::_java_library_path = nullptr; 119 SystemProperty *Arguments::_java_home = nullptr; 120 SystemProperty *Arguments::_java_class_path = nullptr; 121 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr; 122 SystemProperty *Arguments::_vm_info = nullptr; 123 124 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr; 125 PathString *Arguments::_boot_class_path = nullptr; 126 bool Arguments::_has_jimage = false; 127 128 char* Arguments::_ext_dirs = nullptr; 129 130 // True if -Xshare:auto option was specified. 131 static bool xshare_auto_cmd_line = false; 132 133 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 134 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 135 if (new_value == nullptr) { 136 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 137 return false; 138 } 139 if (_value != nullptr) { 140 FreeHeap(_value); 141 } 142 _value = new_value; 143 strcpy(_value, value); 144 return true; 145 } 146 147 void PathString::append_value(const char *value) { 148 char *sp; 149 size_t len = 0; 150 if (value != nullptr) { 151 len = strlen(value); 152 if (_value != nullptr) { 153 len += strlen(_value); 154 } 155 sp = AllocateHeap(len+2, mtArguments); 156 assert(sp != nullptr, "Unable to allocate space for new append path value"); 157 if (sp != nullptr) { 158 if (_value != nullptr) { 159 strcpy(sp, _value); 160 strcat(sp, os::path_separator()); 161 strcat(sp, value); 162 FreeHeap(_value); 163 } else { 164 strcpy(sp, value); 165 } 166 _value = sp; 167 } 168 } 169 } 170 171 PathString::PathString(const char* value) { 172 if (value == nullptr) { 173 _value = nullptr; 174 } else { 175 _value = AllocateHeap(strlen(value)+1, mtArguments); 176 strcpy(_value, value); 177 } 178 } 179 180 PathString::~PathString() { 181 if (_value != nullptr) { 182 FreeHeap(_value); 183 _value = nullptr; 184 } 185 } 186 187 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 188 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value"); 189 size_t len = strlen(module_name) + 1; 190 _module_name = AllocateHeap(len, mtInternal); 191 strncpy(_module_name, module_name, len); // copy the trailing null 192 _path = new PathString(path); 193 } 194 195 ModulePatchPath::~ModulePatchPath() { 196 if (_module_name != nullptr) { 197 FreeHeap(_module_name); 198 _module_name = nullptr; 199 } 200 if (_path != nullptr) { 201 delete _path; 202 _path = nullptr; 203 } 204 } 205 206 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 207 if (key == nullptr) { 208 _key = nullptr; 209 } else { 210 _key = AllocateHeap(strlen(key)+1, mtArguments); 211 strcpy(_key, key); 212 } 213 _next = nullptr; 214 _internal = internal; 215 _writeable = writeable; 216 } 217 218 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 219 // part of the option string. 220 static bool match_option(const JavaVMOption *option, const char* name, 221 const char** tail) { 222 size_t len = strlen(name); 223 if (strncmp(option->optionString, name, len) == 0) { 224 *tail = option->optionString + len; 225 return true; 226 } else { 227 return false; 228 } 229 } 230 231 // Check if 'option' matches 'name'. No "tail" is allowed. 232 static bool match_option(const JavaVMOption *option, const char* name) { 233 const char* tail = nullptr; 234 bool result = match_option(option, name, &tail); 235 if (tail != nullptr && *tail == '\0') { 236 return result; 237 } else { 238 return false; 239 } 240 } 241 242 // Return true if any of the strings in null-terminated array 'names' matches. 243 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 244 // the option must match exactly. 245 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 246 bool tail_allowed) { 247 for (/* empty */; *names != nullptr; ++names) { 248 if (match_option(option, *names, tail)) { 249 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 250 return true; 251 } 252 } 253 } 254 return false; 255 } 256 257 #if INCLUDE_JFR 258 static bool _has_jfr_option = false; // is using JFR 259 260 // return true on failure 261 static bool match_jfr_option(const JavaVMOption** option) { 262 assert((*option)->optionString != nullptr, "invariant"); 263 char* tail = nullptr; 264 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 265 _has_jfr_option = true; 266 return Jfr::on_start_flight_recording_option(option, tail); 267 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 268 _has_jfr_option = true; 269 return Jfr::on_flight_recorder_option(option, tail); 270 } 271 return false; 272 } 273 274 bool Arguments::has_jfr_option() { 275 return _has_jfr_option; 276 } 277 #endif 278 279 static void logOption(const char* opt) { 280 if (PrintVMOptions) { 281 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 282 } 283 } 284 285 bool needs_module_property_warning = false; 286 287 #define MODULE_PROPERTY_PREFIX "jdk.module." 288 #define MODULE_PROPERTY_PREFIX_LEN 11 289 #define ADDEXPORTS "addexports" 290 #define ADDEXPORTS_LEN 10 291 #define ADDREADS "addreads" 292 #define ADDREADS_LEN 8 293 #define ADDOPENS "addopens" 294 #define ADDOPENS_LEN 8 295 #define PATCH "patch" 296 #define PATCH_LEN 5 297 #define ADDMODS "addmods" 298 #define ADDMODS_LEN 7 299 #define LIMITMODS "limitmods" 300 #define LIMITMODS_LEN 9 301 #define PATH "path" 302 #define PATH_LEN 4 303 #define UPGRADE_PATH "upgrade.path" 304 #define UPGRADE_PATH_LEN 12 305 #define ENABLE_NATIVE_ACCESS "enable.native.access" 306 #define ENABLE_NATIVE_ACCESS_LEN 20 307 308 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 309 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 310 return ((strncmp(option, property, len) == 0) && 311 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 312 } 313 314 // Return true if property starts with "jdk.module." and its ensuing chars match 315 // any of the reserved module properties. 316 // property should be passed without the leading "-D". 317 bool Arguments::is_internal_module_property(const char* property) { 318 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 319 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 320 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 321 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 322 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 323 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 324 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 325 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 326 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 327 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 328 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 329 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 330 return true; 331 } 332 } 333 return false; 334 } 335 336 // Process java launcher properties. 337 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 338 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 339 // Must do this before setting up other system properties, 340 // as some of them may depend on launcher type. 341 for (int index = 0; index < args->nOptions; index++) { 342 const JavaVMOption* option = args->options + index; 343 const char* tail; 344 345 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 346 process_java_launcher_argument(tail, option->extraInfo); 347 continue; 348 } 349 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 350 if (strcmp(tail, "true") == 0) { 351 _sun_java_launcher_is_altjvm = true; 352 } 353 continue; 354 } 355 } 356 } 357 358 // Initialize system properties key and value. 359 void Arguments::init_system_properties() { 360 361 // Set up _boot_class_path which is not a property but 362 // relies heavily on argument processing and the jdk.boot.class.path.append 363 // property. It is used to store the underlying boot class path. 364 _boot_class_path = new PathString(nullptr); 365 366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 367 "Java Virtual Machine Specification", false)); 368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 370 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 371 372 // Initialize the vm.info now, but it will need updating after argument parsing. 373 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 374 375 // Following are JVMTI agent writable properties. 376 // Properties values are set to nullptr and they are 377 // os specific they are initialized in os::init_system_properties_values(). 378 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true); 379 _java_library_path = new SystemProperty("java.library.path", nullptr, true); 380 _java_home = new SystemProperty("java.home", nullptr, true); 381 _java_class_path = new SystemProperty("java.class.path", "", true); 382 // jdk.boot.class.path.append is a non-writeable, internal property. 383 // It can only be set by either: 384 // - -Xbootclasspath/a: 385 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 386 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true); 387 388 // Add to System Property list. 389 PropertyList_add(&_system_properties, _sun_boot_library_path); 390 PropertyList_add(&_system_properties, _java_library_path); 391 PropertyList_add(&_system_properties, _java_home); 392 PropertyList_add(&_system_properties, _java_class_path); 393 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 394 PropertyList_add(&_system_properties, _vm_info); 395 396 // Set OS specific system properties values 397 os::init_system_properties_values(); 398 } 399 400 // Update/Initialize System properties after JDK version number is known 401 void Arguments::init_version_specific_system_properties() { 402 enum { bufsz = 16 }; 403 char buffer[bufsz]; 404 const char* spec_vendor = "Oracle Corporation"; 405 uint32_t spec_version = JDK_Version::current().major_version(); 406 407 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 408 409 PropertyList_add(&_system_properties, 410 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 411 PropertyList_add(&_system_properties, 412 new SystemProperty("java.vm.specification.version", buffer, false)); 413 PropertyList_add(&_system_properties, 414 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 415 } 416 417 /* 418 * -XX argument processing: 419 * 420 * -XX arguments are defined in several places, such as: 421 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 422 * -XX arguments are parsed in parse_argument(). 423 * -XX argument bounds checking is done in check_vm_args_consistency(). 424 * 425 * Over time -XX arguments may change. There are mechanisms to handle common cases: 426 * 427 * ALIASED: An option that is simply another name for another option. This is often 428 * part of the process of deprecating a flag, but not all aliases need 429 * to be deprecated. 430 * 431 * Create an alias for an option by adding the old and new option names to the 432 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 433 * 434 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 435 * support may be removed in the future. Both regular and aliased options may be 436 * deprecated. 437 * 438 * Add a deprecation warning for an option (or alias) by adding an entry in the 439 * "special_jvm_flags" table and setting the "deprecated_in" field. 440 * Often an option "deprecated" in one major release will 441 * be made "obsolete" in the next. In this case the entry should also have its 442 * "obsolete_in" field set. 443 * 444 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 445 * on the command line. A warning is printed to let the user know that option might not 446 * be accepted in the future. 447 * 448 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 449 * table and setting the "obsolete_in" field. 450 * 451 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 452 * to the current JDK version. The system will flatly refuse to admit the existence of 453 * the flag. This allows a flag to die automatically over JDK releases. 454 * 455 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 456 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 457 * - Newly obsolete or expired deprecated options should have their global variable 458 * definitions removed (from globals.hpp, etc) and related implementations removed. 459 * 460 * Recommended approach for removing options: 461 * 462 * To remove options commonly used by customers (e.g. product -XX options), use 463 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 464 * 465 * To remove internal options (e.g. diagnostic, experimental, develop options), use 466 * a 2-step model adding major release numbers to the obsolete and expire columns. 467 * 468 * To change the name of an option, use the alias table as well as a 2-step 469 * model adding major release numbers to the deprecate and expire columns. 470 * Think twice about aliasing commonly used customer options. 471 * 472 * There are times when it is appropriate to leave a future release number as undefined. 473 * 474 * Tests: Aliases should be tested in VMAliasOptions.java. 475 * Deprecated options should be tested in VMDeprecatedOptions.java. 476 */ 477 478 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 479 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 480 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 481 // the command-line as usual, but will issue a warning. 482 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 483 // the command-line, while issuing a warning and ignoring the flag value. 484 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 485 // existence of the flag. 486 // 487 // MANUAL CLEANUP ON JDK VERSION UPDATES: 488 // This table ensures that the handling of options will update automatically when the JDK 489 // version is incremented, but the source code needs to be cleanup up manually: 490 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 491 // variable should be removed, as well as users of the variable. 492 // - As "deprecated" options age into "obsolete" options, move the entry into the 493 // "Obsolete Flags" section of the table. 494 // - All expired options should be removed from the table. 495 static SpecialFlag const special_jvm_flags[] = { 496 // -------------- Deprecated Flags -------------- 497 // --- Non-alias flags - sorted by obsolete_in then expired_in: 498 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 499 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 500 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 501 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 502 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 503 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 504 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 505 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 506 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 507 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 508 509 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 510 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 511 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 512 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 513 514 // -------------- Obsolete Flags - sorted by expired_in -------------- 515 516 { "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 { "G1ConcRSLogCacheSize", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 524 { "G1ConcRSHotCardLimit", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 525 { "RefDiscoveryPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 526 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 527 528 #ifdef ASSERT 529 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 530 #endif 531 532 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 533 // These entries will generate build errors. Their purpose is to test the macros. 534 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 535 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 536 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 537 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 538 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 539 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 540 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 541 #endif 542 543 { nullptr, JDK_Version(0), JDK_Version(0) } 544 }; 545 546 // Flags that are aliases for other flags. 547 typedef struct { 548 const char* alias_name; 549 const char* real_name; 550 } AliasedFlag; 551 552 static AliasedFlag const aliased_jvm_flags[] = { 553 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 554 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 555 { nullptr, nullptr} 556 }; 557 558 // Return true if "v" is less than "other", where "other" may be "undefined". 559 static bool version_less_than(JDK_Version v, JDK_Version other) { 560 assert(!v.is_undefined(), "must be defined"); 561 if (!other.is_undefined() && v.compare(other) >= 0) { 562 return false; 563 } else { 564 return true; 565 } 566 } 567 568 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 569 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 570 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 571 flag = special_jvm_flags[i]; 572 return true; 573 } 574 } 575 return false; 576 } 577 578 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 579 assert(version != nullptr, "Must provide a version buffer"); 580 SpecialFlag flag; 581 if (lookup_special_flag(flag_name, flag)) { 582 if (!flag.obsolete_in.is_undefined()) { 583 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 584 *version = flag.obsolete_in; 585 // This flag may have been marked for obsoletion in this version, but we may not 586 // have actually removed it yet. Rather than ignoring it as soon as we reach 587 // this version we allow some time for the removal to happen. So if the flag 588 // still actually exists we process it as normal, but issue an adjusted warning. 589 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 590 if (real_flag != nullptr) { 591 char version_str[256]; 592 version->to_string(version_str, sizeof(version_str)); 593 warning("Temporarily processing option %s; support is scheduled for removal in %s", 594 flag_name, version_str); 595 return false; 596 } 597 return true; 598 } 599 } 600 } 601 return false; 602 } 603 604 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 605 assert(version != nullptr, "Must provide a version buffer"); 606 SpecialFlag flag; 607 if (lookup_special_flag(flag_name, flag)) { 608 if (!flag.deprecated_in.is_undefined()) { 609 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 610 version_less_than(JDK_Version::current(), flag.expired_in)) { 611 *version = flag.deprecated_in; 612 return 1; 613 } else { 614 return -1; 615 } 616 } 617 } 618 return 0; 619 } 620 621 const char* Arguments::real_flag_name(const char *flag_name) { 622 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) { 623 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 624 if (strcmp(flag_status.alias_name, flag_name) == 0) { 625 return flag_status.real_name; 626 } 627 } 628 return flag_name; 629 } 630 631 #ifdef ASSERT 632 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 633 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 634 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 635 return true; 636 } 637 } 638 return false; 639 } 640 641 // Verifies the correctness of the entries in the special_jvm_flags table. 642 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 643 // version being earlier than the deprecation version, then a warning is issued 644 // and verification fails - by returning false. If it is detected that the table 645 // is out of date, with respect to the current version, then ideally a warning is 646 // issued but verification does not fail. This allows the VM to operate when the 647 // version is first updated, without needing to update all the impacted flags at 648 // the same time. In practice we can't issue the warning immediately when the version 649 // is updated as it occurs for every test and some tests are not prepared to handle 650 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 651 // if the check_globals flag is true, and in addition allow a grace period and only 652 // check for stale flags when we hit build 25 (which is far enough into the 6 month 653 // release cycle that all flag updates should have been processed, whilst still 654 // leaving time to make the change before RDP2). 655 // We use a gtest to call this, passing true, so that we can detect stale flags before 656 // the end of the release cycle. 657 658 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 659 660 bool Arguments::verify_special_jvm_flags(bool check_globals) { 661 bool success = true; 662 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 663 const SpecialFlag& flag = special_jvm_flags[i]; 664 if (lookup_special_flag(flag.name, i)) { 665 warning("Duplicate special flag declaration \"%s\"", flag.name); 666 success = false; 667 } 668 if (flag.deprecated_in.is_undefined() && 669 flag.obsolete_in.is_undefined()) { 670 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 671 success = false; 672 } 673 674 if (!flag.deprecated_in.is_undefined()) { 675 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 676 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 677 success = false; 678 } 679 680 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 681 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 682 success = false; 683 } 684 } 685 686 if (!flag.obsolete_in.is_undefined()) { 687 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 688 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 689 success = false; 690 } 691 692 // if flag has become obsolete it should not have a "globals" flag defined anymore. 693 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 694 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 695 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 696 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 697 success = false; 698 } 699 } 700 701 } else if (!flag.expired_in.is_undefined()) { 702 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 703 success = false; 704 } 705 706 if (!flag.expired_in.is_undefined()) { 707 // if flag has become expired it should not have a "globals" flag defined anymore. 708 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 709 !version_less_than(JDK_Version::current(), flag.expired_in)) { 710 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 711 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 712 success = false; 713 } 714 } 715 } 716 } 717 return success; 718 } 719 #endif 720 721 bool Arguments::atojulong(const char *s, julong* result) { 722 return parse_integer(s, result); 723 } 724 725 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 726 if (size < min_size) return arg_too_small; 727 if (size > max_size) return arg_too_big; 728 return arg_in_range; 729 } 730 731 // Describe an argument out of range error 732 void Arguments::describe_range_error(ArgsRange errcode) { 733 switch(errcode) { 734 case arg_too_big: 735 jio_fprintf(defaultStream::error_stream(), 736 "The specified size exceeds the maximum " 737 "representable size.\n"); 738 break; 739 case arg_too_small: 740 case arg_unreadable: 741 case arg_in_range: 742 // do nothing for now 743 break; 744 default: 745 ShouldNotReachHere(); 746 } 747 } 748 749 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 750 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 751 return true; 752 } else { 753 return false; 754 } 755 } 756 757 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 758 // strtod allows leading whitespace, but our flag format does not. 759 if (*value == '\0' || isspace(*value)) { 760 return false; 761 } 762 char* end; 763 errno = 0; 764 double v = strtod(value, &end); 765 if ((errno != 0) || (*end != 0)) { 766 return false; 767 } 768 if (g_isnan(v) || !g_isfinite(v)) { 769 // Currently we cannot handle these special values. 770 return false; 771 } 772 773 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 774 return true; 775 } 776 return false; 777 } 778 779 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 780 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 781 782 if (flag->is_int()) { 783 int v; 784 if (parse_integer(value, &v)) { 785 result = JVMFlagAccess::set_int(flag, &v, origin); 786 } 787 } else if (flag->is_uint()) { 788 uint v; 789 if (parse_integer(value, &v)) { 790 result = JVMFlagAccess::set_uint(flag, &v, origin); 791 } 792 } else if (flag->is_intx()) { 793 intx v; 794 if (parse_integer(value, &v)) { 795 result = JVMFlagAccess::set_intx(flag, &v, origin); 796 } 797 } else if (flag->is_uintx()) { 798 uintx v; 799 if (parse_integer(value, &v)) { 800 result = JVMFlagAccess::set_uintx(flag, &v, origin); 801 } 802 } else if (flag->is_uint64_t()) { 803 uint64_t v; 804 if (parse_integer(value, &v)) { 805 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 806 } 807 } else if (flag->is_size_t()) { 808 size_t v; 809 if (parse_integer(value, &v)) { 810 result = JVMFlagAccess::set_size_t(flag, &v, origin); 811 } 812 } 813 814 return result == JVMFlag::SUCCESS; 815 } 816 817 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 818 if (value[0] == '\0') { 819 value = nullptr; 820 } 821 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 822 // Contract: JVMFlag always returns a pointer that needs freeing. 823 FREE_C_HEAP_ARRAY(char, value); 824 return true; 825 } 826 827 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 828 const char* old_value = ""; 829 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 830 size_t old_len = old_value != nullptr ? strlen(old_value) : 0; 831 size_t new_len = strlen(new_value); 832 const char* value; 833 char* free_this_too = nullptr; 834 if (old_len == 0) { 835 value = new_value; 836 } else if (new_len == 0) { 837 value = old_value; 838 } else { 839 size_t length = old_len + 1 + new_len + 1; 840 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 841 // each new setting adds another LINE to the switch: 842 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 843 value = buf; 844 free_this_too = buf; 845 } 846 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 847 // JVMFlag always returns a pointer that needs freeing. 848 FREE_C_HEAP_ARRAY(char, value); 849 // JVMFlag made its own copy, so I must delete my own temp. buffer. 850 FREE_C_HEAP_ARRAY(char, free_this_too); 851 return true; 852 } 853 854 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 855 const char* real_name = real_flag_name(arg); 856 JDK_Version since = JDK_Version(); 857 switch (is_deprecated_flag(arg, &since)) { 858 case -1: { 859 // Obsolete or expired, so don't process normally, 860 // but allow for an obsolete flag we're still 861 // temporarily allowing. 862 if (!is_obsolete_flag(arg, &since)) { 863 return real_name; 864 } 865 // Note if we're not considered obsolete then we can't be expired either 866 // as obsoletion must come first. 867 return nullptr; 868 } 869 case 0: 870 return real_name; 871 case 1: { 872 char version[256]; 873 since.to_string(version, sizeof(version)); 874 if (real_name != arg) { 875 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 876 arg, version, real_name); 877 } else { 878 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 879 arg, version); 880 } 881 return real_name; 882 } 883 } 884 ShouldNotReachHere(); 885 return nullptr; 886 } 887 888 #define BUFLEN 255 889 890 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 891 char name_copied[BUFLEN+1]; 892 if (name[name_length] != 0) { 893 if (name_length > BUFLEN) { 894 return nullptr; 895 } else { 896 strncpy(name_copied, name, name_length); 897 name_copied[name_length] = '\0'; 898 name = name_copied; 899 } 900 } 901 902 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 903 if (real_name == nullptr) { 904 return nullptr; 905 } 906 JVMFlag* flag = JVMFlag::find_flag(real_name); 907 return flag; 908 } 909 910 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 911 bool is_bool = false; 912 bool bool_val = false; 913 char c = *arg; 914 if (c == '+' || c == '-') { 915 is_bool = true; 916 bool_val = (c == '+'); 917 arg++; 918 } 919 920 const char* name = arg; 921 while (true) { 922 c = *arg; 923 if (isalnum(c) || (c == '_')) { 924 ++arg; 925 } else { 926 break; 927 } 928 } 929 930 size_t name_len = size_t(arg - name); 931 if (name_len == 0) { 932 return false; 933 } 934 935 JVMFlag* flag = find_jvm_flag(name, name_len); 936 if (flag == nullptr) { 937 return false; 938 } 939 940 if (is_bool) { 941 if (*arg != 0) { 942 // Error -- extra characters such as -XX:+BoolFlag=123 943 return false; 944 } 945 return set_bool_flag(flag, bool_val, origin); 946 } 947 948 if (arg[0] == '=') { 949 const char* value = arg + 1; 950 if (flag->is_ccstr()) { 951 if (flag->ccstr_accumulates()) { 952 return append_to_string_flag(flag, value, origin); 953 } else { 954 return set_string_flag(flag, value, origin); 955 } 956 } else if (flag->is_double()) { 957 return set_fp_numeric_flag(flag, value, origin); 958 } else { 959 return set_numeric_flag(flag, value, origin); 960 } 961 } 962 963 if (arg[0] == ':' && arg[1] == '=') { 964 // -XX:Foo:=xxx will reset the string flag to the given value. 965 const char* value = arg + 2; 966 return set_string_flag(flag, value, origin); 967 } 968 969 return false; 970 } 971 972 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 973 assert(bldarray != nullptr, "illegal argument"); 974 975 if (arg == nullptr) { 976 return; 977 } 978 979 int new_count = *count + 1; 980 981 // expand the array and add arg to the last element 982 if (*bldarray == nullptr) { 983 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 984 } else { 985 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 986 } 987 (*bldarray)[*count] = os::strdup_check_oom(arg); 988 *count = new_count; 989 } 990 991 void Arguments::build_jvm_args(const char* arg) { 992 add_string(&_jvm_args_array, &_num_jvm_args, arg); 993 } 994 995 void Arguments::build_jvm_flags(const char* arg) { 996 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 997 } 998 999 // utility function to return a string that concatenates all 1000 // strings in a given char** array 1001 const char* Arguments::build_resource_string(char** args, int count) { 1002 if (args == nullptr || count == 0) { 1003 return nullptr; 1004 } 1005 size_t length = 0; 1006 for (int i = 0; i < count; i++) { 1007 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character 1008 } 1009 char* s = NEW_RESOURCE_ARRAY(char, length); 1010 char* dst = s; 1011 for (int j = 0; j < count; j++) { 1012 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character 1013 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character 1014 dst += offset; 1015 length -= offset; 1016 } 1017 return (const char*) s; 1018 } 1019 1020 void Arguments::print_on(outputStream* st) { 1021 st->print_cr("VM Arguments:"); 1022 if (num_jvm_flags() > 0) { 1023 st->print("jvm_flags: "); print_jvm_flags_on(st); 1024 st->cr(); 1025 } 1026 if (num_jvm_args() > 0) { 1027 st->print("jvm_args: "); print_jvm_args_on(st); 1028 st->cr(); 1029 } 1030 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1031 if (_java_class_path != nullptr) { 1032 char* path = _java_class_path->value(); 1033 size_t len = strlen(path); 1034 st->print("java_class_path (initial): "); 1035 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1036 if (len == 0) { 1037 st->print_raw_cr("<not set>"); 1038 } else { 1039 st->print_raw_cr(path, len); 1040 } 1041 } 1042 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1043 } 1044 1045 void Arguments::print_summary_on(outputStream* st) { 1046 // Print the command line. Environment variables that are helpful for 1047 // reproducing the problem are written later in the hs_err file. 1048 // flags are from setting file 1049 if (num_jvm_flags() > 0) { 1050 st->print_raw("Settings File: "); 1051 print_jvm_flags_on(st); 1052 st->cr(); 1053 } 1054 // args are the command line and environment variable arguments. 1055 st->print_raw("Command Line: "); 1056 if (num_jvm_args() > 0) { 1057 print_jvm_args_on(st); 1058 } 1059 // this is the classfile and any arguments to the java program 1060 if (java_command() != nullptr) { 1061 st->print("%s", java_command()); 1062 } 1063 st->cr(); 1064 } 1065 1066 void Arguments::print_jvm_flags_on(outputStream* st) { 1067 if (_num_jvm_flags > 0) { 1068 for (int i=0; i < _num_jvm_flags; i++) { 1069 st->print("%s ", _jvm_flags_array[i]); 1070 } 1071 } 1072 } 1073 1074 void Arguments::print_jvm_args_on(outputStream* st) { 1075 if (_num_jvm_args > 0) { 1076 for (int i=0; i < _num_jvm_args; i++) { 1077 st->print("%s ", _jvm_args_array[i]); 1078 } 1079 } 1080 } 1081 1082 bool Arguments::process_argument(const char* arg, 1083 jboolean ignore_unrecognized, 1084 JVMFlagOrigin origin) { 1085 JDK_Version since = JDK_Version(); 1086 1087 if (parse_argument(arg, origin)) { 1088 return true; 1089 } 1090 1091 // Determine if the flag has '+', '-', or '=' characters. 1092 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1093 const char* const argname = has_plus_minus ? arg + 1 : arg; 1094 1095 size_t arg_len; 1096 const char* equal_sign = strchr(argname, '='); 1097 if (equal_sign == nullptr) { 1098 arg_len = strlen(argname); 1099 } else { 1100 arg_len = equal_sign - argname; 1101 } 1102 1103 // Only make the obsolete check for valid arguments. 1104 if (arg_len <= BUFLEN) { 1105 // Construct a string which consists only of the argument name without '+', '-', or '='. 1106 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1107 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1108 if (is_obsolete_flag(stripped_argname, &since)) { 1109 char version[256]; 1110 since.to_string(version, sizeof(version)); 1111 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1112 return true; 1113 } 1114 } 1115 1116 // For locked flags, report a custom error message if available. 1117 // Otherwise, report the standard unrecognized VM option. 1118 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1119 if (found_flag != nullptr) { 1120 char locked_message_buf[BUFLEN]; 1121 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1122 if (strlen(locked_message_buf) == 0) { 1123 if (found_flag->is_bool() && !has_plus_minus) { 1124 jio_fprintf(defaultStream::error_stream(), 1125 "Missing +/- setting for VM option '%s'\n", argname); 1126 } else if (!found_flag->is_bool() && has_plus_minus) { 1127 jio_fprintf(defaultStream::error_stream(), 1128 "Unexpected +/- setting in VM option '%s'\n", argname); 1129 } else { 1130 jio_fprintf(defaultStream::error_stream(), 1131 "Improperly specified VM option '%s'\n", argname); 1132 } 1133 } else { 1134 #ifdef PRODUCT 1135 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1136 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1137 if (ignore_unrecognized && mismatched) { 1138 return true; 1139 } 1140 #endif 1141 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1142 } 1143 } else { 1144 if (ignore_unrecognized) { 1145 return true; 1146 } 1147 jio_fprintf(defaultStream::error_stream(), 1148 "Unrecognized VM option '%s'\n", argname); 1149 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1150 if (fuzzy_matched != nullptr) { 1151 jio_fprintf(defaultStream::error_stream(), 1152 "Did you mean '%s%s%s'?\n", 1153 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1154 fuzzy_matched->name(), 1155 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1156 } 1157 } 1158 1159 // allow for commandline "commenting out" options like -XX:#+Verbose 1160 return arg[0] == '#'; 1161 } 1162 1163 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1164 FILE* stream = os::fopen(file_name, "rb"); 1165 if (stream == nullptr) { 1166 if (should_exist) { 1167 jio_fprintf(defaultStream::error_stream(), 1168 "Could not open settings file %s\n", file_name); 1169 return false; 1170 } else { 1171 return true; 1172 } 1173 } 1174 1175 char token[1024]; 1176 int pos = 0; 1177 1178 bool in_white_space = true; 1179 bool in_comment = false; 1180 bool in_quote = false; 1181 char quote_c = 0; 1182 bool result = true; 1183 1184 int c = getc(stream); 1185 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1186 if (in_white_space) { 1187 if (in_comment) { 1188 if (c == '\n') in_comment = false; 1189 } else { 1190 if (c == '#') in_comment = true; 1191 else if (!isspace(c)) { 1192 in_white_space = false; 1193 token[pos++] = c; 1194 } 1195 } 1196 } else { 1197 if (c == '\n' || (!in_quote && isspace(c))) { 1198 // token ends at newline, or at unquoted whitespace 1199 // this allows a way to include spaces in string-valued options 1200 token[pos] = '\0'; 1201 logOption(token); 1202 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1203 build_jvm_flags(token); 1204 pos = 0; 1205 in_white_space = true; 1206 in_quote = false; 1207 } else if (!in_quote && (c == '\'' || c == '"')) { 1208 in_quote = true; 1209 quote_c = c; 1210 } else if (in_quote && (c == quote_c)) { 1211 in_quote = false; 1212 } else { 1213 token[pos++] = c; 1214 } 1215 } 1216 c = getc(stream); 1217 } 1218 if (pos > 0) { 1219 token[pos] = '\0'; 1220 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1221 build_jvm_flags(token); 1222 } 1223 fclose(stream); 1224 return result; 1225 } 1226 1227 //============================================================================================================= 1228 // Parsing of properties (-D) 1229 1230 const char* Arguments::get_property(const char* key) { 1231 return PropertyList_get_value(system_properties(), key); 1232 } 1233 1234 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1235 const char* eq = strchr(prop, '='); 1236 const char* key; 1237 const char* value = ""; 1238 1239 if (eq == nullptr) { 1240 // property doesn't have a value, thus use passed string 1241 key = prop; 1242 } else { 1243 // property have a value, thus extract it and save to the 1244 // allocated string 1245 size_t key_len = eq - prop; 1246 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1247 1248 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1249 key = tmp_key; 1250 1251 value = &prop[key_len + 1]; 1252 } 1253 1254 #if INCLUDE_CDS 1255 if (is_internal_module_property(key) || 1256 strcmp(key, "jdk.module.main") == 0) { 1257 MetaspaceShared::disable_optimized_module_handling(); 1258 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value); 1259 } 1260 if (strcmp(key, "jdk.module.showModuleResolution") == 0 || 1261 strcmp(key, "jdk.module.validation") == 0 || 1262 strcmp(key, "java.system.class.loader") == 0) { 1263 MetaspaceShared::disable_full_module_graph(); 1264 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value); 1265 } 1266 #endif 1267 1268 if (strcmp(key, "java.compiler") == 0) { 1269 // we no longer support java.compiler system property, log a warning and let it get 1270 // passed to Java, like any other system property 1271 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) { 1272 // for applications using NONE or empty value, log a more informative message 1273 warning("The java.compiler system property is obsolete and no longer supported, use -Xint"); 1274 } else { 1275 warning("The java.compiler system property is obsolete and no longer supported."); 1276 } 1277 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1278 // sun.java.launcher.is_altjvm property is 1279 // private and is processed in process_sun_java_launcher_properties(); 1280 // the sun.java.launcher property is passed on to the java application 1281 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1282 // append is true, writable is true, internal is false 1283 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1284 WriteableProperty, ExternalProperty); 1285 } else { 1286 if (strcmp(key, "sun.java.command") == 0) { 1287 char *old_java_command = _java_command; 1288 _java_command = os::strdup_check_oom(value, mtArguments); 1289 if (old_java_command != nullptr) { 1290 os::free(old_java_command); 1291 } 1292 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1293 // If this property is set on the command line then its value will be 1294 // displayed in VM error logs as the URL at which to submit such logs. 1295 // Normally the URL displayed in error logs is different from the value 1296 // of this system property, so a different property should have been 1297 // used here, but we leave this as-is in case someone depends upon it. 1298 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1299 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1300 // its value without going through the property list or making a Java call. 1301 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1302 if (old_java_vendor_url_bug != nullptr) { 1303 os::free((void *)old_java_vendor_url_bug); 1304 } 1305 } 1306 1307 // Create new property and add at the end of the list 1308 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1309 } 1310 1311 if (key != prop) { 1312 // SystemProperty copy passed value, thus free previously allocated 1313 // memory 1314 FreeHeap((void *)key); 1315 } 1316 1317 return true; 1318 } 1319 1320 #if INCLUDE_CDS 1321 const char* unsupported_properties[] = { "jdk.module.limitmods", 1322 "jdk.module.upgrade.path", 1323 "jdk.module.patch.0" }; 1324 const char* unsupported_options[] = { "--limit-modules", 1325 "--upgrade-module-path", 1326 "--patch-module" 1327 }; 1328 void Arguments::check_unsupported_dumping_properties() { 1329 assert(is_dumping_archive(), 1330 "this function is only used with CDS dump time"); 1331 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1332 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1333 SystemProperty* sp = system_properties(); 1334 while (sp != nullptr) { 1335 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1336 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1337 vm_exit_during_initialization( 1338 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1339 } 1340 } 1341 sp = sp->next(); 1342 } 1343 1344 // Check for an exploded module build in use with -Xshare:dump. 1345 if (!has_jimage()) { 1346 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1347 } 1348 } 1349 1350 bool Arguments::check_unsupported_cds_runtime_properties() { 1351 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1352 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1353 if (ArchiveClassesAtExit != nullptr) { 1354 // dynamic dumping, just return false for now. 1355 // check_unsupported_dumping_properties() will be called later to check the same set of 1356 // properties, and will exit the VM with the correct error message if the unsupported properties 1357 // are used. 1358 return false; 1359 } 1360 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1361 if (get_property(unsupported_properties[i]) != nullptr) { 1362 if (RequireSharedSpaces) { 1363 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1364 } else { 1365 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1366 } 1367 return true; 1368 } 1369 } 1370 return false; 1371 } 1372 #endif 1373 1374 //=========================================================================================================== 1375 // Setting int/mixed/comp mode flags 1376 1377 void Arguments::set_mode_flags(Mode mode) { 1378 // Set up default values for all flags. 1379 // If you add a flag to any of the branches below, 1380 // add a default value for it here. 1381 _mode = mode; 1382 1383 // Ensure Agent_OnLoad has the correct initial values. 1384 // This may not be the final mode; mode may change later in onload phase. 1385 PropertyList_unique_add(&_system_properties, "java.vm.info", 1386 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1387 1388 UseInterpreter = true; 1389 UseCompiler = true; 1390 UseLoopCounter = true; 1391 1392 // Default values may be platform/compiler dependent - 1393 // use the saved values 1394 ClipInlining = Arguments::_ClipInlining; 1395 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1396 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1397 BackgroundCompilation = Arguments::_BackgroundCompilation; 1398 1399 // Change from defaults based on mode 1400 switch (mode) { 1401 default: 1402 ShouldNotReachHere(); 1403 break; 1404 case _int: 1405 UseCompiler = false; 1406 UseLoopCounter = false; 1407 AlwaysCompileLoopMethods = false; 1408 UseOnStackReplacement = false; 1409 break; 1410 case _mixed: 1411 // same as default 1412 break; 1413 case _comp: 1414 UseInterpreter = false; 1415 BackgroundCompilation = false; 1416 ClipInlining = false; 1417 break; 1418 } 1419 } 1420 1421 // Conflict: required to use shared spaces (-Xshare:on), but 1422 // incompatible command line options were chosen. 1423 static void no_shared_spaces(const char* message) { 1424 if (RequireSharedSpaces) { 1425 jio_fprintf(defaultStream::error_stream(), 1426 "Class data sharing is inconsistent with other specified options.\n"); 1427 vm_exit_during_initialization("Unable to use shared archive", message); 1428 } else { 1429 log_info(cds)("Unable to use shared archive: %s", message); 1430 UseSharedSpaces = false; 1431 } 1432 } 1433 1434 void set_object_alignment() { 1435 // Object alignment. 1436 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1437 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1438 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1439 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1440 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1441 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1442 1443 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1444 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1445 1446 // Oop encoding heap max 1447 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1448 } 1449 1450 size_t Arguments::max_heap_for_compressed_oops() { 1451 // Avoid sign flip. 1452 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1453 // We need to fit both the null page and the heap into the memory budget, while 1454 // keeping alignment constraints of the heap. To guarantee the latter, as the 1455 // null page is located before the heap, we pad the null page to the conservative 1456 // maximum alignment that the GC may ever impose upon the heap. 1457 size_t displacement_due_to_null_page = align_up(os::vm_page_size(), 1458 _conservative_max_heap_alignment); 1459 1460 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1461 NOT_LP64(ShouldNotReachHere(); return 0); 1462 } 1463 1464 void Arguments::set_use_compressed_oops() { 1465 #ifdef _LP64 1466 // MaxHeapSize is not set up properly at this point, but 1467 // the only value that can override MaxHeapSize if we are 1468 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1469 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1470 1471 if (max_heap_size <= max_heap_for_compressed_oops()) { 1472 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1473 FLAG_SET_ERGO(UseCompressedOops, true); 1474 } 1475 } else { 1476 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1477 warning("Max heap size too large for Compressed Oops"); 1478 FLAG_SET_DEFAULT(UseCompressedOops, false); 1479 } 1480 } 1481 #endif // _LP64 1482 } 1483 1484 void Arguments::set_use_compressed_klass_ptrs() { 1485 #ifdef _LP64 1486 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax, 1487 "CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1488 #endif // _LP64 1489 } 1490 1491 void Arguments::set_conservative_max_heap_alignment() { 1492 // The conservative maximum required alignment for the heap is the maximum of 1493 // the alignments imposed by several sources: any requirements from the heap 1494 // itself and the maximum page size we may run the VM with. 1495 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1496 _conservative_max_heap_alignment = MAX4(heap_alignment, 1497 os::vm_allocation_granularity(), 1498 os::max_page_size(), 1499 GCArguments::compute_heap_alignment()); 1500 } 1501 1502 jint Arguments::set_ergonomics_flags() { 1503 GCConfig::initialize(); 1504 1505 set_conservative_max_heap_alignment(); 1506 1507 #ifdef _LP64 1508 set_use_compressed_oops(); 1509 set_use_compressed_klass_ptrs(); 1510 1511 // Also checks that certain machines are slower with compressed oops 1512 // in vm_version initialization code. 1513 #endif // _LP64 1514 1515 return JNI_OK; 1516 } 1517 1518 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1519 size_t max_allocatable; 1520 size_t result = limit; 1521 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1522 // The AggressiveHeap check is a temporary workaround to avoid calling 1523 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1524 // selected. This works because AggressiveHeap implies UseParallelGC 1525 // where we know the ratio will be 1. Once the AggressiveHeap option is 1526 // removed, this can be cleaned up. 1527 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1528 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1529 result = MIN2(result, max_allocatable / fraction); 1530 } 1531 return result; 1532 } 1533 1534 // Use static initialization to get the default before parsing 1535 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1536 1537 void Arguments::set_heap_size() { 1538 julong phys_mem; 1539 1540 // If the user specified one of these options, they 1541 // want specific memory sizing so do not limit memory 1542 // based on compressed oops addressability. 1543 // Also, memory limits will be calculated based on 1544 // available os physical memory, not our MaxRAM limit, 1545 // unless MaxRAM is also specified. 1546 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1547 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1548 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1549 !FLAG_IS_DEFAULT(MinRAMFraction) || 1550 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1551 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1552 !FLAG_IS_DEFAULT(MaxRAM)); 1553 if (override_coop_limit) { 1554 if (FLAG_IS_DEFAULT(MaxRAM)) { 1555 phys_mem = os::physical_memory(); 1556 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1557 } else { 1558 phys_mem = (julong)MaxRAM; 1559 } 1560 } else { 1561 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1562 : (julong)MaxRAM; 1563 } 1564 1565 1566 // Convert deprecated flags 1567 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1568 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1569 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1570 1571 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1572 !FLAG_IS_DEFAULT(MinRAMFraction)) 1573 MinRAMPercentage = 100.0 / MinRAMFraction; 1574 1575 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1576 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1577 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1578 1579 // If the maximum heap size has not been set with -Xmx, 1580 // then set it as fraction of the size of physical memory, 1581 // respecting the maximum and minimum sizes of the heap. 1582 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1583 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1584 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1585 if (reasonable_min < MaxHeapSize) { 1586 // Small physical memory, so use a minimum fraction of it for the heap 1587 reasonable_max = reasonable_min; 1588 } else { 1589 // Not-small physical memory, so require a heap at least 1590 // as large as MaxHeapSize 1591 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1592 } 1593 1594 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1595 // Limit the heap size to ErgoHeapSizeLimit 1596 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1597 } 1598 1599 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1600 1601 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1602 // An initial heap size was specified on the command line, 1603 // so be sure that the maximum size is consistent. Done 1604 // after call to limit_heap_by_allocatable_memory because that 1605 // method might reduce the allocation size. 1606 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1607 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1608 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1609 } 1610 1611 #ifdef _LP64 1612 if (UseCompressedOops || UseCompressedClassPointers) { 1613 // HeapBaseMinAddress can be greater than default but not less than. 1614 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1615 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1616 // matches compressed oops printing flags 1617 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1618 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1619 DefaultHeapBaseMinAddress, 1620 DefaultHeapBaseMinAddress/G, 1621 HeapBaseMinAddress); 1622 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1623 } 1624 } 1625 } 1626 if (UseCompressedOops) { 1627 // Limit the heap size to the maximum possible when using compressed oops 1628 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1629 1630 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1631 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1632 // but it should be not less than default MaxHeapSize. 1633 max_coop_heap -= HeapBaseMinAddress; 1634 } 1635 1636 // If user specified flags prioritizing os physical 1637 // memory limits, then disable compressed oops if 1638 // limits exceed max_coop_heap and UseCompressedOops 1639 // was not specified. 1640 if (reasonable_max > max_coop_heap) { 1641 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1642 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1643 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1644 "Please check the setting of MaxRAMPercentage %5.2f." 1645 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1646 FLAG_SET_ERGO(UseCompressedOops, false); 1647 } else { 1648 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1649 } 1650 } 1651 } 1652 #endif // _LP64 1653 1654 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1655 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1656 } 1657 1658 // If the minimum or initial heap_size have not been set or requested to be set 1659 // ergonomically, set them accordingly. 1660 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1661 julong reasonable_minimum = (julong)(OldSize + NewSize); 1662 1663 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1664 1665 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1666 1667 if (InitialHeapSize == 0) { 1668 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1669 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1670 1671 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1672 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1673 1674 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1675 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1676 } 1677 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1678 // synchronize with InitialHeapSize to avoid errors with the default value. 1679 if (MinHeapSize == 0) { 1680 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1681 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1682 } 1683 } 1684 } 1685 1686 // This option inspects the machine and attempts to set various 1687 // parameters to be optimal for long-running, memory allocation 1688 // intensive jobs. It is intended for machines with large 1689 // amounts of cpu and memory. 1690 jint Arguments::set_aggressive_heap_flags() { 1691 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1692 // VM, but we may not be able to represent the total physical memory 1693 // available (like having 8gb of memory on a box but using a 32bit VM). 1694 // Thus, we need to make sure we're using a julong for intermediate 1695 // calculations. 1696 julong initHeapSize; 1697 julong total_memory = os::physical_memory(); 1698 1699 if (total_memory < (julong) 256 * M) { 1700 jio_fprintf(defaultStream::error_stream(), 1701 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1702 vm_exit(1); 1703 } 1704 1705 // The heap size is half of available memory, or (at most) 1706 // all of possible memory less 160mb (leaving room for the OS 1707 // when using ISM). This is the maximum; because adaptive sizing 1708 // is turned on below, the actual space used may be smaller. 1709 1710 initHeapSize = MIN2(total_memory / (julong) 2, 1711 total_memory - (julong) 160 * M); 1712 1713 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1714 1715 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1716 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1717 return JNI_EINVAL; 1718 } 1719 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1720 return JNI_EINVAL; 1721 } 1722 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1723 return JNI_EINVAL; 1724 } 1725 } 1726 if (FLAG_IS_DEFAULT(NewSize)) { 1727 // Make the young generation 3/8ths of the total heap. 1728 if (FLAG_SET_CMDLINE(NewSize, 1729 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1730 return JNI_EINVAL; 1731 } 1732 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1733 return JNI_EINVAL; 1734 } 1735 } 1736 1737 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1738 FLAG_SET_DEFAULT(UseLargePages, true); 1739 #endif 1740 1741 // Increase some data structure sizes for efficiency 1742 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1743 return JNI_EINVAL; 1744 } 1745 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1746 return JNI_EINVAL; 1747 } 1748 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1749 return JNI_EINVAL; 1750 } 1751 1752 // See the OldPLABSize comment below, but replace 'after promotion' 1753 // with 'after copying'. YoungPLABSize is the size of the survivor 1754 // space per-gc-thread buffers. The default is 4kw. 1755 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1756 return JNI_EINVAL; 1757 } 1758 1759 // OldPLABSize is the size of the buffers in the old gen that 1760 // UseParallelGC uses to promote live data that doesn't fit in the 1761 // survivor spaces. At any given time, there's one for each gc thread. 1762 // The default size is 1kw. These buffers are rarely used, since the 1763 // survivor spaces are usually big enough. For specjbb, however, there 1764 // are occasions when there's lots of live data in the young gen 1765 // and we end up promoting some of it. We don't have a definite 1766 // explanation for why bumping OldPLABSize helps, but the theory 1767 // is that a bigger PLAB results in retaining something like the 1768 // original allocation order after promotion, which improves mutator 1769 // locality. A minor effect may be that larger PLABs reduce the 1770 // number of PLAB allocation events during gc. The value of 8kw 1771 // was arrived at by experimenting with specjbb. 1772 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1773 return JNI_EINVAL; 1774 } 1775 1776 // Enable parallel GC and adaptive generation sizing 1777 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1778 return JNI_EINVAL; 1779 } 1780 1781 // Encourage steady state memory management 1782 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1783 return JNI_EINVAL; 1784 } 1785 1786 // This appears to improve mutator locality 1787 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1788 return JNI_EINVAL; 1789 } 1790 1791 return JNI_OK; 1792 } 1793 1794 // This must be called after ergonomics. 1795 void Arguments::set_bytecode_flags() { 1796 if (!RewriteBytecodes) { 1797 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1798 } 1799 } 1800 1801 // Aggressive optimization flags 1802 jint Arguments::set_aggressive_opts_flags() { 1803 #ifdef COMPILER2 1804 if (AggressiveUnboxing) { 1805 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1806 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1807 } else if (!EliminateAutoBox) { 1808 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1809 AggressiveUnboxing = false; 1810 } 1811 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1812 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1813 } else if (!DoEscapeAnalysis) { 1814 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1815 AggressiveUnboxing = false; 1816 } 1817 } 1818 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1819 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1820 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1821 } 1822 // Feed the cache size setting into the JDK 1823 char buffer[1024]; 1824 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1825 if (!add_property(buffer)) { 1826 return JNI_ENOMEM; 1827 } 1828 } 1829 #endif 1830 1831 return JNI_OK; 1832 } 1833 1834 //=========================================================================================================== 1835 1836 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1837 if (_sun_java_launcher != _default_java_launcher) { 1838 os::free(const_cast<char*>(_sun_java_launcher)); 1839 } 1840 _sun_java_launcher = os::strdup_check_oom(launcher); 1841 } 1842 1843 bool Arguments::created_by_java_launcher() { 1844 assert(_sun_java_launcher != nullptr, "property must have value"); 1845 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1846 } 1847 1848 bool Arguments::sun_java_launcher_is_altjvm() { 1849 return _sun_java_launcher_is_altjvm; 1850 } 1851 1852 //=========================================================================================================== 1853 // Parsing of main arguments 1854 1855 unsigned int addreads_count = 0; 1856 unsigned int addexports_count = 0; 1857 unsigned int addopens_count = 0; 1858 unsigned int addmods_count = 0; 1859 unsigned int enable_native_access_count = 0; 1860 1861 // Check the consistency of vm_init_args 1862 bool Arguments::check_vm_args_consistency() { 1863 // Method for adding checks for flag consistency. 1864 // The intent is to warn the user of all possible conflicts, 1865 // before returning an error. 1866 // Note: Needs platform-dependent factoring. 1867 bool status = true; 1868 1869 if (TLABRefillWasteFraction == 0) { 1870 jio_fprintf(defaultStream::error_stream(), 1871 "TLABRefillWasteFraction should be a denominator, " 1872 "not " SIZE_FORMAT "\n", 1873 TLABRefillWasteFraction); 1874 status = false; 1875 } 1876 1877 status = CompilerConfig::check_args_consistency(status); 1878 #if INCLUDE_JVMCI 1879 if (status && EnableJVMCI) { 1880 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 1881 AddProperty, UnwriteableProperty, InternalProperty); 1882 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) { 1883 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 1884 return false; 1885 } 1886 } 1887 } 1888 #endif 1889 1890 #if INCLUDE_JFR 1891 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1892 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) { 1893 return false; 1894 } 1895 } 1896 #endif 1897 1898 #ifndef SUPPORT_RESERVED_STACK_AREA 1899 if (StackReservedPages != 0) { 1900 FLAG_SET_CMDLINE(StackReservedPages, 0); 1901 warning("Reserved Stack Area not supported on this platform"); 1902 } 1903 #endif 1904 1905 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypePassFieldsAsArgs)) { 1906 FLAG_SET_CMDLINE(InlineTypePassFieldsAsArgs, false); 1907 warning("InlineTypePassFieldsAsArgs is not supported on this platform"); 1908 } 1909 1910 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypeReturnedAsFields)) { 1911 FLAG_SET_CMDLINE(InlineTypeReturnedAsFields, false); 1912 warning("InlineTypeReturnedAsFields is not supported on this platform"); 1913 } 1914 1915 1916 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) 1917 if (LockingMode == LM_LIGHTWEIGHT) { 1918 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY); 1919 warning("New lightweight locking not supported on this platform"); 1920 } 1921 #endif 1922 1923 if (UseHeavyMonitors) { 1924 if (FLAG_IS_CMDLINE(LockingMode) && LockingMode != LM_MONITOR) { 1925 jio_fprintf(defaultStream::error_stream(), 1926 "Conflicting -XX:+UseHeavyMonitors and -XX:LockingMode=%d flags\n", LockingMode); 1927 return false; 1928 } 1929 FLAG_SET_CMDLINE(LockingMode, LM_MONITOR); 1930 } 1931 1932 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390) 1933 if (LockingMode == LM_MONITOR) { 1934 jio_fprintf(defaultStream::error_stream(), 1935 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n"); 1936 return false; 1937 } 1938 #endif 1939 #if defined(X86) && !defined(ZERO) 1940 if (LockingMode == LM_MONITOR && UseRTMForStackLocks) { 1941 jio_fprintf(defaultStream::error_stream(), 1942 "LockingMode == 0 (LM_MONITOR) and -XX:+UseRTMForStackLocks are mutually exclusive\n"); 1943 1944 return false; 1945 } 1946 #endif 1947 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) { 1948 jio_fprintf(defaultStream::error_stream(), 1949 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n"); 1950 return false; 1951 } 1952 return status; 1953 } 1954 1955 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1956 const char* option_type) { 1957 if (ignore) return false; 1958 1959 const char* spacer = " "; 1960 if (option_type == nullptr) { 1961 option_type = ++spacer; // Set both to the empty string. 1962 } 1963 1964 jio_fprintf(defaultStream::error_stream(), 1965 "Unrecognized %s%soption: %s\n", option_type, spacer, 1966 option->optionString); 1967 return true; 1968 } 1969 1970 static const char* user_assertion_options[] = { 1971 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1972 }; 1973 1974 static const char* system_assertion_options[] = { 1975 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1976 }; 1977 1978 bool Arguments::parse_uintx(const char* value, 1979 uintx* uintx_arg, 1980 uintx min_size) { 1981 uintx n; 1982 if (!parse_integer(value, &n)) { 1983 return false; 1984 } 1985 if (n >= min_size) { 1986 *uintx_arg = n; 1987 return true; 1988 } else { 1989 return false; 1990 } 1991 } 1992 1993 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 1994 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 1995 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 1996 char* property = AllocateHeap(prop_len, mtArguments); 1997 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 1998 if (ret < 0 || ret >= (int)prop_len) { 1999 FreeHeap(property); 2000 return false; 2001 } 2002 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 2003 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 2004 // that multiple occurrences of the associated flag just causes the existing property value to be 2005 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 2006 // to a property after we have finished flag processing. 2007 bool added = add_property(property, WriteableProperty, internal); 2008 FreeHeap(property); 2009 return added; 2010 } 2011 2012 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2013 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 2014 const unsigned int props_count_limit = 1000; 2015 const int max_digits = 3; 2016 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2017 2018 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2019 if (count < props_count_limit) { 2020 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2021 char* property = AllocateHeap(prop_len, mtArguments); 2022 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2023 if (ret < 0 || ret >= (int)prop_len) { 2024 FreeHeap(property); 2025 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2026 return false; 2027 } 2028 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2029 FreeHeap(property); 2030 return added; 2031 } 2032 2033 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2034 return false; 2035 } 2036 2037 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2038 julong* long_arg, 2039 julong min_size, 2040 julong max_size) { 2041 if (!parse_integer(s, long_arg)) return arg_unreadable; 2042 return check_memory_size(*long_arg, min_size, max_size); 2043 } 2044 2045 // Parse JavaVMInitArgs structure 2046 2047 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 2048 const JavaVMInitArgs *java_tool_options_args, 2049 const JavaVMInitArgs *java_options_args, 2050 const JavaVMInitArgs *cmd_line_args) { 2051 // Save default settings for some mode flags 2052 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2053 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2054 Arguments::_ClipInlining = ClipInlining; 2055 Arguments::_BackgroundCompilation = BackgroundCompilation; 2056 2057 // Remember the default value of SharedBaseAddress. 2058 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 2059 2060 // Setup flags for mixed which is the default 2061 set_mode_flags(_mixed); 2062 2063 // Parse args structure generated from java.base vm options resource 2064 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE); 2065 if (result != JNI_OK) { 2066 return result; 2067 } 2068 2069 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2070 // variable (if present). 2071 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR); 2072 if (result != JNI_OK) { 2073 return result; 2074 } 2075 2076 // Parse args structure generated from the command line flags. 2077 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE); 2078 if (result != JNI_OK) { 2079 return result; 2080 } 2081 2082 // Parse args structure generated from the _JAVA_OPTIONS environment 2083 // variable (if present) (mimics classic VM) 2084 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR); 2085 if (result != JNI_OK) { 2086 return result; 2087 } 2088 2089 // Disable CDS for exploded image 2090 if (!has_jimage()) { 2091 no_shared_spaces("CDS disabled on exploded JDK"); 2092 } 2093 2094 // We need to ensure processor and memory resources have been properly 2095 // configured - which may rely on arguments we just processed - before 2096 // doing the final argument processing. Any argument processing that 2097 // needs to know about processor and memory resources must occur after 2098 // this point. 2099 2100 os::init_container_support(); 2101 2102 SystemMemoryBarrier::initialize(); 2103 2104 // Do final processing now that all arguments have been parsed 2105 result = finalize_vm_init_args(); 2106 if (result != JNI_OK) { 2107 return result; 2108 } 2109 2110 return JNI_OK; 2111 } 2112 2113 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2114 // represents a valid JDWP agent. is_path==true denotes that we 2115 // are dealing with -agentpath (case where name is a path), otherwise with 2116 // -agentlib 2117 bool valid_jdwp_agent(char *name, bool is_path) { 2118 char *_name; 2119 const char *_jdwp = "jdwp"; 2120 size_t _len_jdwp, _len_prefix; 2121 2122 if (is_path) { 2123 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) { 2124 return false; 2125 } 2126 2127 _name++; // skip past last path separator 2128 _len_prefix = strlen(JNI_LIB_PREFIX); 2129 2130 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2131 return false; 2132 } 2133 2134 _name += _len_prefix; 2135 _len_jdwp = strlen(_jdwp); 2136 2137 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2138 _name += _len_jdwp; 2139 } 2140 else { 2141 return false; 2142 } 2143 2144 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2145 return false; 2146 } 2147 2148 return true; 2149 } 2150 2151 if (strcmp(name, _jdwp) == 0) { 2152 return true; 2153 } 2154 2155 return false; 2156 } 2157 2158 int Arguments::process_patch_mod_option(const char* patch_mod_tail) { 2159 // --patch-module=<module>=<file>(<pathsep><file>)* 2160 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value"); 2161 // Find the equal sign between the module name and the path specification 2162 const char* module_equal = strchr(patch_mod_tail, '='); 2163 if (module_equal == nullptr) { 2164 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2165 return JNI_ERR; 2166 } else { 2167 // Pick out the module name 2168 size_t module_len = module_equal - patch_mod_tail; 2169 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2170 if (module_name != nullptr) { 2171 memcpy(module_name, patch_mod_tail, module_len); 2172 *(module_name + module_len) = '\0'; 2173 // The path piece begins one past the module_equal sign 2174 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */); 2175 FREE_C_HEAP_ARRAY(char, module_name); 2176 } else { 2177 return JNI_ENOMEM; 2178 } 2179 } 2180 return JNI_OK; 2181 } 2182 2183 // VALUECLASS_STR must match string used in the build 2184 #define VALUECLASS_STR "valueclasses" 2185 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar" 2186 2187 // Finalize --patch-module args and --enable-preview related to value class module patches. 2188 // Create all numbered properties passing module patches. 2189 int Arguments::finalize_patch_module() { 2190 // If --enable-preview and EnableValhalla is true, each module may have value classes that 2191 // are to be patched into the module. 2192 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/ 2193 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar 2194 if (enable_preview() && EnableValhalla) { 2195 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2196 const char * fileSep = os::file_separator(); 2197 2198 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s", 2199 Arguments::get_java_home(), fileSep, fileSep, fileSep); 2200 DIR* dir = os::opendir(valueclasses_dir); 2201 if (dir != nullptr) { 2202 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2203 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2204 2205 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) { 2206 // Test if file ends-with "-valueclasses.jar" 2207 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1); 2208 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) { 2209 continue; // too short or not the expected suffix 2210 } 2211 2212 strcpy(module_name, entry->d_name); 2213 module_name[len] = '\0'; // truncate to just module-name 2214 2215 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name); 2216 add_patch_mod_prefix(module_name, path, true /* append */); 2217 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name); 2218 } 2219 FreeHeap(module_name); 2220 FreeHeap(path); 2221 os::closedir(dir); 2222 } 2223 FreeHeap(valueclasses_dir); 2224 } 2225 2226 // Create numbered properties for each module that has been patched either 2227 // by --patch-module or --enable-preview 2228 // Format is "jdk.module.patch.<n>=<module_name>=<path>" 2229 if (_patch_mod_prefix != nullptr) { 2230 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments); 2231 unsigned int patch_mod_count = 0; 2232 2233 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin(); 2234 it != _patch_mod_prefix->end(); ++it) { 2235 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s", 2236 (*it)->module_name(), (*it)->path_string()); 2237 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) { 2238 FreeHeap(prop_value); 2239 return JNI_ENOMEM; 2240 } 2241 } 2242 FreeHeap(prop_value); 2243 } 2244 return JNI_OK; 2245 } 2246 2247 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2248 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2249 // The min and max sizes match the values in globals.hpp, but scaled 2250 // with K. The values have been chosen so that alignment with page 2251 // size doesn't change the max value, which makes the conversions 2252 // back and forth between Xss value and ThreadStackSize value easier. 2253 // The values have also been chosen to fit inside a 32-bit signed type. 2254 const julong min_ThreadStackSize = 0; 2255 const julong max_ThreadStackSize = 1 * M; 2256 2257 // Make sure the above values match the range set in globals.hpp 2258 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2259 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2260 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2261 2262 const julong min_size = min_ThreadStackSize * K; 2263 const julong max_size = max_ThreadStackSize * K; 2264 2265 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2266 2267 julong size = 0; 2268 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2269 if (errcode != arg_in_range) { 2270 bool silent = (option == nullptr); // Allow testing to silence error messages 2271 if (!silent) { 2272 jio_fprintf(defaultStream::error_stream(), 2273 "Invalid thread stack size: %s\n", option->optionString); 2274 describe_range_error(errcode); 2275 } 2276 return JNI_EINVAL; 2277 } 2278 2279 // Internally track ThreadStackSize in units of 1024 bytes. 2280 const julong size_aligned = align_up(size, K); 2281 assert(size <= size_aligned, 2282 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2283 size, size_aligned); 2284 2285 const julong size_in_K = size_aligned / K; 2286 assert(size_in_K < (julong)max_intx, 2287 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2288 size_in_K); 2289 2290 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2291 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2292 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2293 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2294 max_expanded, size_in_K); 2295 2296 *out_ThreadStackSize = (intx)size_in_K; 2297 2298 return JNI_OK; 2299 } 2300 2301 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) { 2302 // For match_option to return remaining or value part of option string 2303 const char* tail; 2304 2305 // iterate over arguments 2306 for (int index = 0; index < args->nOptions; index++) { 2307 bool is_absolute_path = false; // for -agentpath vs -agentlib 2308 2309 const JavaVMOption* option = args->options + index; 2310 2311 if (!match_option(option, "-Djava.class.path", &tail) && 2312 !match_option(option, "-Dsun.java.command", &tail) && 2313 !match_option(option, "-Dsun.java.launcher", &tail)) { 2314 2315 // add all jvm options to the jvm_args string. This string 2316 // is used later to set the java.vm.args PerfData string constant. 2317 // the -Djava.class.path and the -Dsun.java.command options are 2318 // omitted from jvm_args string as each have their own PerfData 2319 // string constant object. 2320 build_jvm_args(option->optionString); 2321 } 2322 2323 // -verbose:[class/module/gc/jni] 2324 if (match_option(option, "-verbose", &tail)) { 2325 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2326 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2327 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2328 } else if (!strcmp(tail, ":module")) { 2329 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2330 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2331 } else if (!strcmp(tail, ":gc")) { 2332 if (_legacyGCLogging.lastFlag == 0) { 2333 _legacyGCLogging.lastFlag = 1; 2334 } 2335 } else if (!strcmp(tail, ":jni")) { 2336 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2337 } 2338 // -da / -ea / -disableassertions / -enableassertions 2339 // These accept an optional class/package name separated by a colon, e.g., 2340 // -da:java.lang.Thread. 2341 } else if (match_option(option, user_assertion_options, &tail, true)) { 2342 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2343 if (*tail == '\0') { 2344 JavaAssertions::setUserClassDefault(enable); 2345 } else { 2346 assert(*tail == ':', "bogus match by match_option()"); 2347 JavaAssertions::addOption(tail + 1, enable); 2348 } 2349 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2350 } else if (match_option(option, system_assertion_options, &tail, false)) { 2351 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2352 JavaAssertions::setSystemClassDefault(enable); 2353 // -bootclasspath: 2354 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2355 jio_fprintf(defaultStream::output_stream(), 2356 "-Xbootclasspath is no longer a supported option.\n"); 2357 return JNI_EINVAL; 2358 // -bootclasspath/a: 2359 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2360 Arguments::append_sysclasspath(tail); 2361 #if INCLUDE_CDS 2362 MetaspaceShared::disable_optimized_module_handling(); 2363 log_info(cds)("optimized module handling: disabled because bootclasspath was appended"); 2364 #endif 2365 // -bootclasspath/p: 2366 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2367 jio_fprintf(defaultStream::output_stream(), 2368 "-Xbootclasspath/p is no longer a supported option.\n"); 2369 return JNI_EINVAL; 2370 // -Xrun 2371 } else if (match_option(option, "-Xrun", &tail)) { 2372 if (tail != nullptr) { 2373 const char* pos = strchr(tail, ':'); 2374 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail; 2375 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2376 jio_snprintf(name, len + 1, "%s", tail); 2377 2378 char *options = nullptr; 2379 if(pos != nullptr) { 2380 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2381 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2382 } 2383 #if !INCLUDE_JVMTI 2384 if (strcmp(name, "jdwp") == 0) { 2385 jio_fprintf(defaultStream::error_stream(), 2386 "Debugging agents are not supported in this VM\n"); 2387 return JNI_ERR; 2388 } 2389 #endif // !INCLUDE_JVMTI 2390 JvmtiAgentList::add_xrun(name, options, false); 2391 FREE_C_HEAP_ARRAY(char, name); 2392 FREE_C_HEAP_ARRAY(char, options); 2393 } 2394 } else if (match_option(option, "--add-reads=", &tail)) { 2395 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2396 return JNI_ENOMEM; 2397 } 2398 } else if (match_option(option, "--add-exports=", &tail)) { 2399 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2400 return JNI_ENOMEM; 2401 } 2402 } else if (match_option(option, "--add-opens=", &tail)) { 2403 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2404 return JNI_ENOMEM; 2405 } 2406 } else if (match_option(option, "--add-modules=", &tail)) { 2407 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2408 return JNI_ENOMEM; 2409 } 2410 } else if (match_option(option, "--enable-native-access=", &tail)) { 2411 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2412 return JNI_ENOMEM; 2413 } 2414 } else if (match_option(option, "--limit-modules=", &tail)) { 2415 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2416 return JNI_ENOMEM; 2417 } 2418 } else if (match_option(option, "--module-path=", &tail)) { 2419 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2420 return JNI_ENOMEM; 2421 } 2422 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2423 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2424 return JNI_ENOMEM; 2425 } 2426 } else if (match_option(option, "--patch-module=", &tail)) { 2427 // --patch-module=<module>=<file>(<pathsep><file>)* 2428 int res = process_patch_mod_option(tail); 2429 if (res != JNI_OK) { 2430 return res; 2431 } 2432 } else if (match_option(option, "--illegal-access=", &tail)) { 2433 char version[256]; 2434 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2435 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2436 // -agentlib and -agentpath 2437 } else if (match_option(option, "-agentlib:", &tail) || 2438 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2439 if(tail != nullptr) { 2440 const char* pos = strchr(tail, '='); 2441 char* name; 2442 if (pos == nullptr) { 2443 name = os::strdup_check_oom(tail, mtArguments); 2444 } else { 2445 size_t len = pos - tail; 2446 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2447 memcpy(name, tail, len); 2448 name[len] = '\0'; 2449 } 2450 2451 char *options = nullptr; 2452 if(pos != nullptr) { 2453 options = os::strdup_check_oom(pos + 1, mtArguments); 2454 } 2455 #if !INCLUDE_JVMTI 2456 if (valid_jdwp_agent(name, is_absolute_path)) { 2457 jio_fprintf(defaultStream::error_stream(), 2458 "Debugging agents are not supported in this VM\n"); 2459 return JNI_ERR; 2460 } 2461 #endif // !INCLUDE_JVMTI 2462 JvmtiAgentList::add(name, options, is_absolute_path); 2463 os::free(name); 2464 os::free(options); 2465 } 2466 // -javaagent 2467 } else if (match_option(option, "-javaagent:", &tail)) { 2468 #if !INCLUDE_JVMTI 2469 jio_fprintf(defaultStream::error_stream(), 2470 "Instrumentation agents are not supported in this VM\n"); 2471 return JNI_ERR; 2472 #else 2473 if (tail != nullptr) { 2474 size_t length = strlen(tail) + 1; 2475 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2476 jio_snprintf(options, length, "%s", tail); 2477 JvmtiAgentList::add("instrument", options, false); 2478 FREE_C_HEAP_ARRAY(char, options); 2479 2480 // java agents need module java.instrument 2481 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2482 return JNI_ENOMEM; 2483 } 2484 } 2485 #endif // !INCLUDE_JVMTI 2486 // --enable_preview 2487 } else if (match_option(option, "--enable-preview")) { 2488 set_enable_preview(); 2489 // -Xnoclassgc 2490 } else if (match_option(option, "-Xnoclassgc")) { 2491 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2492 return JNI_EINVAL; 2493 } 2494 // -Xbatch 2495 } else if (match_option(option, "-Xbatch")) { 2496 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2497 return JNI_EINVAL; 2498 } 2499 // -Xmn for compatibility with other JVM vendors 2500 } else if (match_option(option, "-Xmn", &tail)) { 2501 julong long_initial_young_size = 0; 2502 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2503 if (errcode != arg_in_range) { 2504 jio_fprintf(defaultStream::error_stream(), 2505 "Invalid initial young generation size: %s\n", option->optionString); 2506 describe_range_error(errcode); 2507 return JNI_EINVAL; 2508 } 2509 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2510 return JNI_EINVAL; 2511 } 2512 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2513 return JNI_EINVAL; 2514 } 2515 // -Xms 2516 } else if (match_option(option, "-Xms", &tail)) { 2517 julong size = 0; 2518 // an initial heap size of 0 means automatically determine 2519 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2520 if (errcode != arg_in_range) { 2521 jio_fprintf(defaultStream::error_stream(), 2522 "Invalid initial heap size: %s\n", option->optionString); 2523 describe_range_error(errcode); 2524 return JNI_EINVAL; 2525 } 2526 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2527 return JNI_EINVAL; 2528 } 2529 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2530 return JNI_EINVAL; 2531 } 2532 // -Xmx 2533 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2534 julong long_max_heap_size = 0; 2535 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2536 if (errcode != arg_in_range) { 2537 jio_fprintf(defaultStream::error_stream(), 2538 "Invalid maximum heap size: %s\n", option->optionString); 2539 describe_range_error(errcode); 2540 return JNI_EINVAL; 2541 } 2542 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2543 return JNI_EINVAL; 2544 } 2545 // Xmaxf 2546 } else if (match_option(option, "-Xmaxf", &tail)) { 2547 char* err; 2548 int maxf = (int)(strtod(tail, &err) * 100); 2549 if (*err != '\0' || *tail == '\0') { 2550 jio_fprintf(defaultStream::error_stream(), 2551 "Bad max heap free percentage size: %s\n", 2552 option->optionString); 2553 return JNI_EINVAL; 2554 } else { 2555 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2556 return JNI_EINVAL; 2557 } 2558 } 2559 // Xminf 2560 } else if (match_option(option, "-Xminf", &tail)) { 2561 char* err; 2562 int minf = (int)(strtod(tail, &err) * 100); 2563 if (*err != '\0' || *tail == '\0') { 2564 jio_fprintf(defaultStream::error_stream(), 2565 "Bad min heap free percentage size: %s\n", 2566 option->optionString); 2567 return JNI_EINVAL; 2568 } else { 2569 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2570 return JNI_EINVAL; 2571 } 2572 } 2573 // -Xss 2574 } else if (match_option(option, "-Xss", &tail)) { 2575 intx value = 0; 2576 jint err = parse_xss(option, tail, &value); 2577 if (err != JNI_OK) { 2578 return err; 2579 } 2580 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2581 return JNI_EINVAL; 2582 } 2583 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2584 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2585 julong long_ReservedCodeCacheSize = 0; 2586 2587 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2588 if (errcode != arg_in_range) { 2589 jio_fprintf(defaultStream::error_stream(), 2590 "Invalid maximum code cache size: %s.\n", option->optionString); 2591 return JNI_EINVAL; 2592 } 2593 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2594 return JNI_EINVAL; 2595 } 2596 // -green 2597 } else if (match_option(option, "-green")) { 2598 jio_fprintf(defaultStream::error_stream(), 2599 "Green threads support not available\n"); 2600 return JNI_EINVAL; 2601 // -native 2602 } else if (match_option(option, "-native")) { 2603 // HotSpot always uses native threads, ignore silently for compatibility 2604 // -Xrs 2605 } else if (match_option(option, "-Xrs")) { 2606 // Classic/EVM option, new functionality 2607 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2608 return JNI_EINVAL; 2609 } 2610 // -Xprof 2611 } else if (match_option(option, "-Xprof")) { 2612 char version[256]; 2613 // Obsolete in JDK 10 2614 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2615 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2616 // -Xinternalversion 2617 } else if (match_option(option, "-Xinternalversion")) { 2618 jio_fprintf(defaultStream::output_stream(), "%s\n", 2619 VM_Version::internal_vm_info_string()); 2620 vm_exit(0); 2621 #ifndef PRODUCT 2622 // -Xprintflags 2623 } else if (match_option(option, "-Xprintflags")) { 2624 JVMFlag::printFlags(tty, false); 2625 vm_exit(0); 2626 #endif 2627 // -D 2628 } else if (match_option(option, "-D", &tail)) { 2629 const char* value; 2630 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2631 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2632 // abort if -Djava.endorsed.dirs is set 2633 jio_fprintf(defaultStream::output_stream(), 2634 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2635 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2636 return JNI_EINVAL; 2637 } 2638 if (match_option(option, "-Djava.ext.dirs=", &value) && 2639 *value != '\0' && strcmp(value, "\"\"") != 0) { 2640 // abort if -Djava.ext.dirs is set 2641 jio_fprintf(defaultStream::output_stream(), 2642 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2643 return JNI_EINVAL; 2644 } 2645 // Check for module related properties. They must be set using the modules 2646 // options. For example: use "--add-modules=java.sql", not 2647 // "-Djdk.module.addmods=java.sql" 2648 if (is_internal_module_property(option->optionString + 2)) { 2649 needs_module_property_warning = true; 2650 continue; 2651 } 2652 if (!add_property(tail)) { 2653 return JNI_ENOMEM; 2654 } 2655 // Out of the box management support 2656 if (match_option(option, "-Dcom.sun.management", &tail)) { 2657 #if INCLUDE_MANAGEMENT 2658 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2659 return JNI_EINVAL; 2660 } 2661 // management agent in module jdk.management.agent 2662 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2663 return JNI_ENOMEM; 2664 } 2665 #else 2666 jio_fprintf(defaultStream::output_stream(), 2667 "-Dcom.sun.management is not supported in this VM.\n"); 2668 return JNI_ERR; 2669 #endif 2670 } 2671 // -Xint 2672 } else if (match_option(option, "-Xint")) { 2673 set_mode_flags(_int); 2674 // -Xmixed 2675 } else if (match_option(option, "-Xmixed")) { 2676 set_mode_flags(_mixed); 2677 // -Xcomp 2678 } else if (match_option(option, "-Xcomp")) { 2679 // for testing the compiler; turn off all flags that inhibit compilation 2680 set_mode_flags(_comp); 2681 // -Xshare:dump 2682 } else if (match_option(option, "-Xshare:dump")) { 2683 DumpSharedSpaces = true; 2684 // -Xshare:on 2685 } else if (match_option(option, "-Xshare:on")) { 2686 UseSharedSpaces = true; 2687 RequireSharedSpaces = true; 2688 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2689 } else if (match_option(option, "-Xshare:auto")) { 2690 UseSharedSpaces = true; 2691 RequireSharedSpaces = false; 2692 xshare_auto_cmd_line = true; 2693 // -Xshare:off 2694 } else if (match_option(option, "-Xshare:off")) { 2695 UseSharedSpaces = false; 2696 RequireSharedSpaces = false; 2697 // -Xverify 2698 } else if (match_option(option, "-Xverify", &tail)) { 2699 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2700 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2701 return JNI_EINVAL; 2702 } 2703 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2704 return JNI_EINVAL; 2705 } 2706 } else if (strcmp(tail, ":remote") == 0) { 2707 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2708 return JNI_EINVAL; 2709 } 2710 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2711 return JNI_EINVAL; 2712 } 2713 } else if (strcmp(tail, ":none") == 0) { 2714 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2715 return JNI_EINVAL; 2716 } 2717 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2718 return JNI_EINVAL; 2719 } 2720 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2721 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2722 return JNI_EINVAL; 2723 } 2724 // -Xdebug 2725 } else if (match_option(option, "-Xdebug")) { 2726 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release."); 2727 // -Xnoagent 2728 } else if (match_option(option, "-Xnoagent")) { 2729 warning("Option -Xnoagent was deprecated in JDK 22 and will likely be removed in a future release."); 2730 } else if (match_option(option, "-Xloggc:", &tail)) { 2731 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2732 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2733 _legacyGCLogging.lastFlag = 2; 2734 _legacyGCLogging.file = os::strdup_check_oom(tail); 2735 } else if (match_option(option, "-Xlog", &tail)) { 2736 bool ret = false; 2737 if (strcmp(tail, ":help") == 0) { 2738 fileStream stream(defaultStream::output_stream()); 2739 LogConfiguration::print_command_line_help(&stream); 2740 vm_exit(0); 2741 } else if (strcmp(tail, ":disable") == 0) { 2742 LogConfiguration::disable_logging(); 2743 ret = true; 2744 } else if (strcmp(tail, ":async") == 0) { 2745 LogConfiguration::set_async_mode(true); 2746 ret = true; 2747 } else if (*tail == '\0') { 2748 ret = LogConfiguration::parse_command_line_arguments(); 2749 assert(ret, "-Xlog without arguments should never fail to parse"); 2750 } else if (*tail == ':') { 2751 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2752 } 2753 if (ret == false) { 2754 jio_fprintf(defaultStream::error_stream(), 2755 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2756 tail); 2757 return JNI_EINVAL; 2758 } 2759 // JNI hooks 2760 } else if (match_option(option, "-Xcheck", &tail)) { 2761 if (!strcmp(tail, ":jni")) { 2762 #if !INCLUDE_JNI_CHECK 2763 warning("JNI CHECKING is not supported in this VM"); 2764 #else 2765 CheckJNICalls = true; 2766 #endif // INCLUDE_JNI_CHECK 2767 } else if (is_bad_option(option, args->ignoreUnrecognized, 2768 "check")) { 2769 return JNI_EINVAL; 2770 } 2771 } else if (match_option(option, "vfprintf")) { 2772 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2773 } else if (match_option(option, "exit")) { 2774 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2775 } else if (match_option(option, "abort")) { 2776 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2777 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2778 // and the last option wins. 2779 } else if (match_option(option, "-XX:+NeverTenure")) { 2780 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2781 return JNI_EINVAL; 2782 } 2783 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2784 return JNI_EINVAL; 2785 } 2786 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2787 return JNI_EINVAL; 2788 } 2789 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2790 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2791 return JNI_EINVAL; 2792 } 2793 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2794 return JNI_EINVAL; 2795 } 2796 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2797 return JNI_EINVAL; 2798 } 2799 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2800 uintx max_tenuring_thresh = 0; 2801 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2802 jio_fprintf(defaultStream::error_stream(), 2803 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2804 return JNI_EINVAL; 2805 } 2806 2807 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2808 return JNI_EINVAL; 2809 } 2810 2811 if (MaxTenuringThreshold == 0) { 2812 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2813 return JNI_EINVAL; 2814 } 2815 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2816 return JNI_EINVAL; 2817 } 2818 } else { 2819 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2820 return JNI_EINVAL; 2821 } 2822 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2823 return JNI_EINVAL; 2824 } 2825 } 2826 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2827 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2828 return JNI_EINVAL; 2829 } 2830 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2831 return JNI_EINVAL; 2832 } 2833 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2834 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2835 return JNI_EINVAL; 2836 } 2837 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2838 return JNI_EINVAL; 2839 } 2840 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2841 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2842 return JNI_EINVAL; 2843 } 2844 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2845 return JNI_EINVAL; 2846 } 2847 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2848 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2849 return JNI_EINVAL; 2850 } 2851 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2852 return JNI_EINVAL; 2853 } 2854 } else if (match_option(option, "--finalization=", &tail)) { 2855 if (strcmp(tail, "enabled") == 0) { 2856 InstanceKlass::set_finalization_enabled(true); 2857 } else if (strcmp(tail, "disabled") == 0) { 2858 InstanceKlass::set_finalization_enabled(false); 2859 } else { 2860 jio_fprintf(defaultStream::error_stream(), 2861 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2862 tail); 2863 return JNI_EINVAL; 2864 } 2865 #if !defined(DTRACE_ENABLED) 2866 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2867 jio_fprintf(defaultStream::error_stream(), 2868 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2869 return JNI_EINVAL; 2870 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2871 jio_fprintf(defaultStream::error_stream(), 2872 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2873 return JNI_EINVAL; 2874 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2875 jio_fprintf(defaultStream::error_stream(), 2876 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2877 return JNI_EINVAL; 2878 #endif // !defined(DTRACE_ENABLED) 2879 #ifdef ASSERT 2880 } else if (match_option(option, "-XX:+FullGCALot")) { 2881 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2882 return JNI_EINVAL; 2883 } 2884 // disable scavenge before parallel mark-compact 2885 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2886 return JNI_EINVAL; 2887 } 2888 #endif 2889 #if !INCLUDE_MANAGEMENT 2890 } else if (match_option(option, "-XX:+ManagementServer")) { 2891 jio_fprintf(defaultStream::error_stream(), 2892 "ManagementServer is not supported in this VM.\n"); 2893 return JNI_ERR; 2894 #endif // INCLUDE_MANAGEMENT 2895 #if INCLUDE_JVMCI 2896 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) { 2897 if (EnableJVMCIProduct) { 2898 jio_fprintf(defaultStream::error_stream(), 2899 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n"); 2900 return JNI_EINVAL; 2901 } 2902 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) { 2903 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT"); 2904 if (use_graal_jit) { 2905 const char* jvmci_compiler = get_property("jvmci.Compiler"); 2906 if (jvmci_compiler != nullptr) { 2907 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) { 2908 jio_fprintf(defaultStream::error_stream(), 2909 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler); 2910 return JNI_ERR; 2911 } 2912 } else if (!add_property("jvmci.Compiler=graal")) { 2913 return JNI_ENOMEM; 2914 } 2915 } 2916 2917 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before 2918 if (EnableJVMCIProduct) { 2919 continue; 2920 } 2921 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2922 // Allow this flag if it has been unlocked. 2923 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) { 2924 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) { 2925 jio_fprintf(defaultStream::error_stream(), 2926 "Unable to enable JVMCI in product mode\n"); 2927 return JNI_ERR; 2928 } 2929 } 2930 // The flag was locked so process normally to report that error 2931 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2932 return JNI_EINVAL; 2933 } 2934 #endif // INCLUDE_JVMCI 2935 #if INCLUDE_JFR 2936 } else if (match_jfr_option(&option)) { 2937 return JNI_EINVAL; 2938 #endif 2939 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2940 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2941 // already been handled 2942 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2943 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2944 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2945 return JNI_EINVAL; 2946 } 2947 } 2948 // Unknown option 2949 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2950 return JNI_ERR; 2951 } 2952 } 2953 2954 if (!EnableValhalla && EnablePrimitiveClasses) { 2955 jio_fprintf(defaultStream::error_stream(), 2956 "Cannot specify -XX:+EnablePrimitiveClasses without -XX:+EnableValhalla"); 2957 return JNI_EINVAL; 2958 } 2959 2960 // PrintSharedArchiveAndExit will turn on 2961 // -Xshare:on 2962 // -Xlog:class+path=info 2963 if (PrintSharedArchiveAndExit) { 2964 UseSharedSpaces = true; 2965 RequireSharedSpaces = true; 2966 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2967 } 2968 2969 fix_appclasspath(); 2970 2971 return JNI_OK; 2972 } 2973 2974 bool match_module(void *module_name, ModulePatchPath *patch) { 2975 return (strcmp((char *)module_name, patch->module_name()) == 0); 2976 } 2977 2978 bool Arguments::patch_mod_javabase() { 2979 return _patch_mod_prefix != nullptr && _patch_mod_prefix->find((void*)JAVA_BASE_NAME, match_module) >= 0; 2980 } 2981 2982 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append) { 2983 // Create GrowableArray lazily, only if --patch-module has been specified 2984 if (_patch_mod_prefix == nullptr) { 2985 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2986 } 2987 2988 // Scan patches for matching module 2989 int i = _patch_mod_prefix->find((void*)module_name, match_module); 2990 if (i == -1) { 2991 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2992 } else { 2993 if (allow_append) { 2994 // append path to existing module entry 2995 _patch_mod_prefix->at(i)->append_path(path); 2996 } else { 2997 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2998 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2999 } else { 3000 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name); 3001 } 3002 } 3003 } 3004 } 3005 3006 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3007 // 3008 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3009 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3010 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3011 // path is treated as the current directory. 3012 // 3013 // This causes problems with CDS, which requires that all directories specified in the classpath 3014 // must be empty. In most cases, applications do NOT want to load classes from the current 3015 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3016 // scripts compatible with CDS. 3017 void Arguments::fix_appclasspath() { 3018 if (IgnoreEmptyClassPaths) { 3019 const char separator = *os::path_separator(); 3020 const char* src = _java_class_path->value(); 3021 3022 // skip over all the leading empty paths 3023 while (*src == separator) { 3024 src ++; 3025 } 3026 3027 char* copy = os::strdup_check_oom(src, mtArguments); 3028 3029 // trim all trailing empty paths 3030 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3031 *tail = '\0'; 3032 } 3033 3034 char from[3] = {separator, separator, '\0'}; 3035 char to [2] = {separator, '\0'}; 3036 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3037 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3038 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3039 } 3040 3041 _java_class_path->set_writeable_value(copy); 3042 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3043 } 3044 } 3045 3046 jint Arguments::finalize_vm_init_args() { 3047 // check if the default lib/endorsed directory exists; if so, error 3048 char path[JVM_MAXPATHLEN]; 3049 const char* fileSep = os::file_separator(); 3050 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3051 3052 DIR* dir = os::opendir(path); 3053 if (dir != nullptr) { 3054 jio_fprintf(defaultStream::output_stream(), 3055 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3056 "in modular form will be supported via the concept of upgradeable modules.\n"); 3057 os::closedir(dir); 3058 return JNI_ERR; 3059 } 3060 3061 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3062 dir = os::opendir(path); 3063 if (dir != nullptr) { 3064 jio_fprintf(defaultStream::output_stream(), 3065 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3066 "Use -classpath instead.\n."); 3067 os::closedir(dir); 3068 return JNI_ERR; 3069 } 3070 3071 // This must be done after all arguments have been processed 3072 // and the container support has been initialized since AggressiveHeap 3073 // relies on the amount of total memory available. 3074 if (AggressiveHeap) { 3075 jint result = set_aggressive_heap_flags(); 3076 if (result != JNI_OK) { 3077 return result; 3078 } 3079 } 3080 3081 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3082 // but like -Xint, leave compilation thresholds unaffected. 3083 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3084 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3085 set_mode_flags(_int); 3086 } 3087 3088 #ifdef ZERO 3089 // Zero always runs in interpreted mode 3090 set_mode_flags(_int); 3091 #endif 3092 3093 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3094 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3095 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3096 } 3097 3098 #if !COMPILER2_OR_JVMCI 3099 // Don't degrade server performance for footprint 3100 if (FLAG_IS_DEFAULT(UseLargePages) && 3101 MaxHeapSize < LargePageHeapSizeThreshold) { 3102 // No need for large granularity pages w/small heaps. 3103 // Note that large pages are enabled/disabled for both the 3104 // Java heap and the code cache. 3105 FLAG_SET_DEFAULT(UseLargePages, false); 3106 } 3107 3108 UNSUPPORTED_OPTION(ProfileInterpreter); 3109 #endif 3110 3111 // Parse the CompilationMode flag 3112 if (!CompilationModeFlag::initialize()) { 3113 return JNI_ERR; 3114 } 3115 3116 if (!check_vm_args_consistency()) { 3117 return JNI_ERR; 3118 } 3119 3120 // finalize --module-patch and related --enable-preview 3121 if (finalize_patch_module() != JNI_OK) { 3122 return JNI_ERR; 3123 } 3124 3125 #if INCLUDE_CDS 3126 if (DumpSharedSpaces) { 3127 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3128 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable 3129 // compiler just to be safe. 3130 // 3131 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the 3132 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler. 3133 // TODO: revisit the following for the static archive case. 3134 set_mode_flags(_int); 3135 3136 // String deduplication may cause CDS to iterate the strings in different order from one 3137 // run to another which resulting in non-determinstic CDS archives. 3138 // Disable UseStringDeduplication while dumping CDS archive. 3139 UseStringDeduplication = false; 3140 } 3141 3142 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit 3143 if (ArchiveClassesAtExit != nullptr && RecordDynamicDumpInfo) { 3144 jio_fprintf(defaultStream::output_stream(), 3145 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n"); 3146 return JNI_ERR; 3147 } 3148 3149 if (ArchiveClassesAtExit == nullptr && !RecordDynamicDumpInfo) { 3150 DynamicDumpSharedSpaces = false; 3151 } else { 3152 DynamicDumpSharedSpaces = true; 3153 } 3154 3155 if (AutoCreateSharedArchive) { 3156 if (SharedArchiveFile == nullptr) { 3157 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile"); 3158 return JNI_ERR; 3159 } 3160 if (ArchiveClassesAtExit != nullptr) { 3161 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit"); 3162 return JNI_ERR; 3163 } 3164 } 3165 3166 if (UseSharedSpaces && patch_mod_javabase()) { 3167 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3168 } 3169 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3170 UseSharedSpaces = false; 3171 } 3172 3173 if (DumpSharedSpaces || DynamicDumpSharedSpaces) { 3174 // Always verify non-system classes during CDS dump 3175 if (!BytecodeVerificationRemote) { 3176 BytecodeVerificationRemote = true; 3177 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3178 } 3179 } 3180 #endif 3181 3182 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3183 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3184 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3185 3186 return JNI_OK; 3187 } 3188 3189 // Helper class for controlling the lifetime of JavaVMInitArgs 3190 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3191 // deleted on the destruction of the ScopedVMInitArgs object. 3192 class ScopedVMInitArgs : public StackObj { 3193 private: 3194 JavaVMInitArgs _args; 3195 char* _container_name; 3196 bool _is_set; 3197 char* _vm_options_file_arg; 3198 3199 public: 3200 ScopedVMInitArgs(const char *container_name) { 3201 _args.version = JNI_VERSION_1_2; 3202 _args.nOptions = 0; 3203 _args.options = nullptr; 3204 _args.ignoreUnrecognized = false; 3205 _container_name = (char *)container_name; 3206 _is_set = false; 3207 _vm_options_file_arg = nullptr; 3208 } 3209 3210 // Populates the JavaVMInitArgs object represented by this 3211 // ScopedVMInitArgs object with the arguments in options. The 3212 // allocated memory is deleted by the destructor. If this method 3213 // returns anything other than JNI_OK, then this object is in a 3214 // partially constructed state, and should be abandoned. 3215 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3216 _is_set = true; 3217 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3218 JavaVMOption, options->length(), mtArguments); 3219 if (options_arr == nullptr) { 3220 return JNI_ENOMEM; 3221 } 3222 _args.options = options_arr; 3223 3224 for (int i = 0; i < options->length(); i++) { 3225 options_arr[i] = options->at(i); 3226 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3227 if (options_arr[i].optionString == nullptr) { 3228 // Rely on the destructor to do cleanup. 3229 _args.nOptions = i; 3230 return JNI_ENOMEM; 3231 } 3232 } 3233 3234 _args.nOptions = options->length(); 3235 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3236 return JNI_OK; 3237 } 3238 3239 JavaVMInitArgs* get() { return &_args; } 3240 char* container_name() { return _container_name; } 3241 bool is_set() { return _is_set; } 3242 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; } 3243 char* vm_options_file_arg() { return _vm_options_file_arg; } 3244 3245 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3246 if (_vm_options_file_arg != nullptr) { 3247 os::free(_vm_options_file_arg); 3248 } 3249 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3250 } 3251 3252 ~ScopedVMInitArgs() { 3253 if (_vm_options_file_arg != nullptr) { 3254 os::free(_vm_options_file_arg); 3255 } 3256 if (_args.options == nullptr) return; 3257 for (int i = 0; i < _args.nOptions; i++) { 3258 os::free(_args.options[i].optionString); 3259 } 3260 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3261 } 3262 3263 // Insert options into this option list, to replace option at 3264 // vm_options_file_pos (-XX:VMOptionsFile) 3265 jint insert(const JavaVMInitArgs* args, 3266 const JavaVMInitArgs* args_to_insert, 3267 const int vm_options_file_pos) { 3268 assert(_args.options == nullptr, "shouldn't be set yet"); 3269 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3270 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3271 3272 int length = args->nOptions + args_to_insert->nOptions - 1; 3273 // Construct new option array 3274 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3275 for (int i = 0; i < args->nOptions; i++) { 3276 if (i == vm_options_file_pos) { 3277 // insert the new options starting at the same place as the 3278 // -XX:VMOptionsFile option 3279 for (int j = 0; j < args_to_insert->nOptions; j++) { 3280 options.push(args_to_insert->options[j]); 3281 } 3282 } else { 3283 options.push(args->options[i]); 3284 } 3285 } 3286 // make into options array 3287 return set_args(&options); 3288 } 3289 }; 3290 3291 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3292 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3293 } 3294 3295 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3296 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3297 } 3298 3299 jint Arguments::parse_options_environment_variable(const char* name, 3300 ScopedVMInitArgs* vm_args) { 3301 char *buffer = ::getenv(name); 3302 3303 // Don't check this environment variable if user has special privileges 3304 // (e.g. unix su command). 3305 if (buffer == nullptr || os::have_special_privileges()) { 3306 return JNI_OK; 3307 } 3308 3309 if ((buffer = os::strdup(buffer)) == nullptr) { 3310 return JNI_ENOMEM; 3311 } 3312 3313 jio_fprintf(defaultStream::error_stream(), 3314 "Picked up %s: %s\n", name, buffer); 3315 3316 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3317 3318 os::free(buffer); 3319 return retcode; 3320 } 3321 3322 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3323 // read file into buffer 3324 int fd = ::open(file_name, O_RDONLY); 3325 if (fd < 0) { 3326 jio_fprintf(defaultStream::error_stream(), 3327 "Could not open options file '%s'\n", 3328 file_name); 3329 return JNI_ERR; 3330 } 3331 3332 struct stat stbuf; 3333 int retcode = os::stat(file_name, &stbuf); 3334 if (retcode != 0) { 3335 jio_fprintf(defaultStream::error_stream(), 3336 "Could not stat options file '%s'\n", 3337 file_name); 3338 ::close(fd); 3339 return JNI_ERR; 3340 } 3341 3342 if (stbuf.st_size == 0) { 3343 // tell caller there is no option data and that is ok 3344 ::close(fd); 3345 return JNI_OK; 3346 } 3347 3348 // '+ 1' for null termination even with max bytes 3349 size_t bytes_alloc = stbuf.st_size + 1; 3350 3351 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3352 if (nullptr == buf) { 3353 jio_fprintf(defaultStream::error_stream(), 3354 "Could not allocate read buffer for options file parse\n"); 3355 ::close(fd); 3356 return JNI_ENOMEM; 3357 } 3358 3359 memset(buf, 0, bytes_alloc); 3360 3361 // Fill buffer 3362 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3363 ::close(fd); 3364 if (bytes_read < 0) { 3365 FREE_C_HEAP_ARRAY(char, buf); 3366 jio_fprintf(defaultStream::error_stream(), 3367 "Could not read options file '%s'\n", file_name); 3368 return JNI_ERR; 3369 } 3370 3371 if (bytes_read == 0) { 3372 // tell caller there is no option data and that is ok 3373 FREE_C_HEAP_ARRAY(char, buf); 3374 return JNI_OK; 3375 } 3376 3377 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3378 3379 FREE_C_HEAP_ARRAY(char, buf); 3380 return retcode; 3381 } 3382 3383 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3384 // Construct option array 3385 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3386 3387 // some pointers to help with parsing 3388 char *buffer_end = buffer + buf_len; 3389 char *opt_hd = buffer; 3390 char *wrt = buffer; 3391 char *rd = buffer; 3392 3393 // parse all options 3394 while (rd < buffer_end) { 3395 // skip leading white space from the input string 3396 while (rd < buffer_end && isspace(*rd)) { 3397 rd++; 3398 } 3399 3400 if (rd >= buffer_end) { 3401 break; 3402 } 3403 3404 // Remember this is where we found the head of the token. 3405 opt_hd = wrt; 3406 3407 // Tokens are strings of non white space characters separated 3408 // by one or more white spaces. 3409 while (rd < buffer_end && !isspace(*rd)) { 3410 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3411 int quote = *rd; // matching quote to look for 3412 rd++; // don't copy open quote 3413 while (rd < buffer_end && *rd != quote) { 3414 // include everything (even spaces) 3415 // up until the close quote 3416 *wrt++ = *rd++; // copy to option string 3417 } 3418 3419 if (rd < buffer_end) { 3420 rd++; // don't copy close quote 3421 } else { 3422 // did not see closing quote 3423 jio_fprintf(defaultStream::error_stream(), 3424 "Unmatched quote in %s\n", name); 3425 return JNI_ERR; 3426 } 3427 } else { 3428 *wrt++ = *rd++; // copy to option string 3429 } 3430 } 3431 3432 // steal a white space character and set it to null 3433 *wrt++ = '\0'; 3434 // We now have a complete token 3435 3436 JavaVMOption option; 3437 option.optionString = opt_hd; 3438 option.extraInfo = nullptr; 3439 3440 options.append(option); // Fill in option 3441 3442 rd++; // Advance to next character 3443 } 3444 3445 // Fill out JavaVMInitArgs structure. 3446 return vm_args->set_args(&options); 3447 } 3448 3449 void Arguments::set_shared_spaces_flags_and_archive_paths() { 3450 if (DumpSharedSpaces) { 3451 if (RequireSharedSpaces) { 3452 warning("Cannot dump shared archive while using shared archive"); 3453 } 3454 UseSharedSpaces = false; 3455 } 3456 #if INCLUDE_CDS 3457 // Initialize shared archive paths which could include both base and dynamic archive paths 3458 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly. 3459 // 3460 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid. 3461 if (DumpSharedSpaces || UseSharedSpaces) { 3462 init_shared_archive_paths(); 3463 } 3464 #endif // INCLUDE_CDS 3465 } 3466 3467 #if INCLUDE_CDS 3468 // Sharing support 3469 // Construct the path to the archive 3470 char* Arguments::get_default_shared_archive_path() { 3471 if (_default_shared_archive_path == nullptr) { 3472 char jvm_path[JVM_MAXPATHLEN]; 3473 os::jvm_path(jvm_path, sizeof(jvm_path)); 3474 char *end = strrchr(jvm_path, *os::file_separator()); 3475 if (end != nullptr) *end = '\0'; 3476 size_t jvm_path_len = strlen(jvm_path); 3477 size_t file_sep_len = strlen(os::file_separator()); 3478 const size_t len = jvm_path_len + file_sep_len + 20; 3479 _default_shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3480 jio_snprintf(_default_shared_archive_path, len, 3481 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa", 3482 jvm_path, os::file_separator()); 3483 } 3484 return _default_shared_archive_path; 3485 } 3486 3487 int Arguments::num_archives(const char* archive_path) { 3488 if (archive_path == nullptr) { 3489 return 0; 3490 } 3491 int npaths = 1; 3492 char* p = (char*)archive_path; 3493 while (*p != '\0') { 3494 if (*p == os::path_separator()[0]) { 3495 npaths++; 3496 } 3497 p++; 3498 } 3499 return npaths; 3500 } 3501 3502 void Arguments::extract_shared_archive_paths(const char* archive_path, 3503 char** base_archive_path, 3504 char** top_archive_path) { 3505 char* begin_ptr = (char*)archive_path; 3506 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3507 if (end_ptr == nullptr || end_ptr == begin_ptr) { 3508 vm_exit_during_initialization("Base archive was not specified", archive_path); 3509 } 3510 size_t len = end_ptr - begin_ptr; 3511 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3512 strncpy(cur_path, begin_ptr, len); 3513 cur_path[len] = '\0'; 3514 *base_archive_path = cur_path; 3515 3516 begin_ptr = ++end_ptr; 3517 if (*begin_ptr == '\0') { 3518 vm_exit_during_initialization("Top archive was not specified", archive_path); 3519 } 3520 end_ptr = strchr(begin_ptr, '\0'); 3521 assert(end_ptr != nullptr, "sanity"); 3522 len = end_ptr - begin_ptr; 3523 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3524 strncpy(cur_path, begin_ptr, len + 1); 3525 *top_archive_path = cur_path; 3526 } 3527 3528 void Arguments::init_shared_archive_paths() { 3529 if (ArchiveClassesAtExit != nullptr) { 3530 assert(!RecordDynamicDumpInfo, "already checked"); 3531 if (DumpSharedSpaces) { 3532 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3533 } 3534 check_unsupported_dumping_properties(); 3535 3536 if (os::same_files(get_default_shared_archive_path(), ArchiveClassesAtExit)) { 3537 vm_exit_during_initialization( 3538 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path()); 3539 } 3540 } 3541 3542 if (SharedArchiveFile == nullptr) { 3543 SharedArchivePath = get_default_shared_archive_path(); 3544 } else { 3545 int archives = num_archives(SharedArchiveFile); 3546 assert(archives > 0, "must be"); 3547 3548 if (is_dumping_archive() && archives > 1) { 3549 vm_exit_during_initialization( 3550 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3551 } 3552 3553 if (DumpSharedSpaces) { 3554 assert(archives == 1, "must be"); 3555 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file 3556 // will be overwritten no matter regardless of its contents 3557 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3558 } else { 3559 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa 3560 // is read from top.jsa 3561 // (a) 1 file: -XX:SharedArchiveFile=base.jsa 3562 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa 3563 // (c) 2 files: -XX:SharedArchiveFile=top.jsa 3564 // 3565 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not 3566 // allow cases (b) and (c). Case (b) is already checked above. 3567 3568 if (archives > 2) { 3569 vm_exit_during_initialization( 3570 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3571 } 3572 if (archives == 1) { 3573 char* base_archive_path = nullptr; 3574 bool success = 3575 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path); 3576 if (!success) { 3577 // If +AutoCreateSharedArchive and the specified shared archive does not exist, 3578 // regenerate the dynamic archive base on default archive. 3579 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) { 3580 DynamicDumpSharedSpaces = true; 3581 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile); 3582 SharedArchivePath = get_default_shared_archive_path(); 3583 SharedArchiveFile = nullptr; 3584 } else { 3585 if (AutoCreateSharedArchive) { 3586 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info."); 3587 AutoCreateSharedArchive = false; 3588 } 3589 no_shared_spaces("invalid archive"); 3590 } 3591 } else if (base_archive_path == nullptr) { 3592 // User has specified a single archive, which is a static archive. 3593 SharedArchivePath = const_cast<char *>(SharedArchiveFile); 3594 } else { 3595 // User has specified a single archive, which is a dynamic archive. 3596 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile); 3597 SharedArchivePath = base_archive_path; // has been c-heap allocated. 3598 } 3599 } else { 3600 extract_shared_archive_paths((const char*)SharedArchiveFile, 3601 &SharedArchivePath, &SharedDynamicArchivePath); 3602 if (SharedArchivePath == nullptr) { 3603 assert(SharedDynamicArchivePath == nullptr, "must be"); 3604 no_shared_spaces("invalid archive"); 3605 } 3606 } 3607 3608 if (SharedDynamicArchivePath != nullptr) { 3609 // Check for case (c) 3610 if (RecordDynamicDumpInfo) { 3611 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3612 SharedArchiveFile); 3613 } 3614 if (ArchiveClassesAtExit != nullptr) { 3615 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3616 SharedArchiveFile); 3617 } 3618 } 3619 3620 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3621 vm_exit_during_initialization( 3622 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3623 SharedArchiveFile); 3624 } 3625 } 3626 } 3627 } 3628 #endif // INCLUDE_CDS 3629 3630 #ifndef PRODUCT 3631 // Determine whether LogVMOutput should be implicitly turned on. 3632 static bool use_vm_log() { 3633 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3634 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3635 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3636 PrintAssembly || TraceDeoptimization || 3637 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3638 return true; 3639 } 3640 3641 #ifdef COMPILER1 3642 if (PrintC1Statistics) { 3643 return true; 3644 } 3645 #endif // COMPILER1 3646 3647 #ifdef COMPILER2 3648 if (PrintOptoAssembly || PrintOptoStatistics) { 3649 return true; 3650 } 3651 #endif // COMPILER2 3652 3653 return false; 3654 } 3655 3656 #endif // PRODUCT 3657 3658 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3659 for (int index = 0; index < args->nOptions; index++) { 3660 const JavaVMOption* option = args->options + index; 3661 const char* tail; 3662 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3663 return true; 3664 } 3665 } 3666 return false; 3667 } 3668 3669 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3670 const char* vm_options_file, 3671 const int vm_options_file_pos, 3672 ScopedVMInitArgs* vm_options_file_args, 3673 ScopedVMInitArgs* args_out) { 3674 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3675 if (code != JNI_OK) { 3676 return code; 3677 } 3678 3679 if (vm_options_file_args->get()->nOptions < 1) { 3680 return JNI_OK; 3681 } 3682 3683 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3684 jio_fprintf(defaultStream::error_stream(), 3685 "A VM options file may not refer to a VM options file. " 3686 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3687 "options file '%s' in options container '%s' is an error.\n", 3688 vm_options_file_args->vm_options_file_arg(), 3689 vm_options_file_args->container_name()); 3690 return JNI_EINVAL; 3691 } 3692 3693 return args_out->insert(args, vm_options_file_args->get(), 3694 vm_options_file_pos); 3695 } 3696 3697 // Expand -XX:VMOptionsFile found in args_in as needed. 3698 // mod_args and args_out parameters may return values as needed. 3699 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3700 ScopedVMInitArgs* mod_args, 3701 JavaVMInitArgs** args_out) { 3702 jint code = match_special_option_and_act(args_in, mod_args); 3703 if (code != JNI_OK) { 3704 return code; 3705 } 3706 3707 if (mod_args->is_set()) { 3708 // args_in contains -XX:VMOptionsFile and mod_args contains the 3709 // original options from args_in along with the options expanded 3710 // from the VMOptionsFile. Return a short-hand to the caller. 3711 *args_out = mod_args->get(); 3712 } else { 3713 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3714 } 3715 return JNI_OK; 3716 } 3717 3718 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3719 ScopedVMInitArgs* args_out) { 3720 // Remaining part of option string 3721 const char* tail; 3722 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3723 3724 for (int index = 0; index < args->nOptions; index++) { 3725 const JavaVMOption* option = args->options + index; 3726 if (match_option(option, "-XX:Flags=", &tail)) { 3727 Arguments::set_jvm_flags_file(tail); 3728 continue; 3729 } 3730 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3731 if (vm_options_file_args.found_vm_options_file_arg()) { 3732 jio_fprintf(defaultStream::error_stream(), 3733 "The option '%s' is already specified in the options " 3734 "container '%s' so the specification of '%s' in the " 3735 "same options container is an error.\n", 3736 vm_options_file_args.vm_options_file_arg(), 3737 vm_options_file_args.container_name(), 3738 option->optionString); 3739 return JNI_EINVAL; 3740 } 3741 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3742 // If there's a VMOptionsFile, parse that 3743 jint code = insert_vm_options_file(args, tail, index, 3744 &vm_options_file_args, args_out); 3745 if (code != JNI_OK) { 3746 return code; 3747 } 3748 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3749 if (args_out->is_set()) { 3750 // The VMOptions file inserted some options so switch 'args' 3751 // to the new set of options, and continue processing which 3752 // preserves "last option wins" semantics. 3753 args = args_out->get(); 3754 // The first option from the VMOptionsFile replaces the 3755 // current option. So we back track to process the 3756 // replacement option. 3757 index--; 3758 } 3759 continue; 3760 } 3761 if (match_option(option, "-XX:+PrintVMOptions")) { 3762 PrintVMOptions = true; 3763 continue; 3764 } 3765 if (match_option(option, "-XX:-PrintVMOptions")) { 3766 PrintVMOptions = false; 3767 continue; 3768 } 3769 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3770 IgnoreUnrecognizedVMOptions = true; 3771 continue; 3772 } 3773 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3774 IgnoreUnrecognizedVMOptions = false; 3775 continue; 3776 } 3777 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3778 JVMFlag::printFlags(tty, false); 3779 vm_exit(0); 3780 } 3781 3782 #ifndef PRODUCT 3783 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3784 JVMFlag::printFlags(tty, true); 3785 vm_exit(0); 3786 } 3787 #endif 3788 } 3789 return JNI_OK; 3790 } 3791 3792 static void print_options(const JavaVMInitArgs *args) { 3793 const char* tail; 3794 for (int index = 0; index < args->nOptions; index++) { 3795 const JavaVMOption *option = args->options + index; 3796 if (match_option(option, "-XX:", &tail)) { 3797 logOption(tail); 3798 } 3799 } 3800 } 3801 3802 bool Arguments::handle_deprecated_print_gc_flags() { 3803 if (PrintGC) { 3804 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3805 } 3806 if (PrintGCDetails) { 3807 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3808 } 3809 3810 if (_legacyGCLogging.lastFlag == 2) { 3811 // -Xloggc was used to specify a filename 3812 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3813 3814 LogTarget(Error, logging) target; 3815 LogStream errstream(target); 3816 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream); 3817 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3818 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3819 } 3820 return true; 3821 } 3822 3823 static void apply_debugger_ergo() { 3824 #ifndef PRODUCT 3825 // UseDebuggerErgo is notproduct 3826 if (ReplayCompiles) { 3827 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3828 } 3829 #endif 3830 3831 #ifndef PRODUCT 3832 if (UseDebuggerErgo) { 3833 // Turn on sub-flags 3834 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3835 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3836 } 3837 #endif 3838 3839 if (UseDebuggerErgo2) { 3840 // Debugging with limited number of CPUs 3841 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3842 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3843 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3844 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3845 } 3846 } 3847 3848 // Parse entry point called from JNI_CreateJavaVM 3849 3850 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3851 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3852 JVMFlag::check_all_flag_declarations(); 3853 3854 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3855 const char* hotspotrc = ".hotspotrc"; 3856 bool settings_file_specified = false; 3857 bool needs_hotspotrc_warning = false; 3858 ScopedVMInitArgs initial_vm_options_args(""); 3859 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3860 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3861 3862 // Pointers to current working set of containers 3863 JavaVMInitArgs* cur_cmd_args; 3864 JavaVMInitArgs* cur_vm_options_args; 3865 JavaVMInitArgs* cur_java_options_args; 3866 JavaVMInitArgs* cur_java_tool_options_args; 3867 3868 // Containers for modified/expanded options 3869 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3870 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3871 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3872 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3873 3874 3875 jint code = 3876 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3877 if (code != JNI_OK) { 3878 return code; 3879 } 3880 3881 code = parse_java_options_environment_variable(&initial_java_options_args); 3882 if (code != JNI_OK) { 3883 return code; 3884 } 3885 3886 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3887 char *vmoptions = ClassLoader::lookup_vm_options(); 3888 if (vmoptions != nullptr) { 3889 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3890 FREE_C_HEAP_ARRAY(char, vmoptions); 3891 if (code != JNI_OK) { 3892 return code; 3893 } 3894 } 3895 3896 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3897 &mod_java_tool_options_args, 3898 &cur_java_tool_options_args); 3899 if (code != JNI_OK) { 3900 return code; 3901 } 3902 3903 code = expand_vm_options_as_needed(initial_cmd_args, 3904 &mod_cmd_args, 3905 &cur_cmd_args); 3906 if (code != JNI_OK) { 3907 return code; 3908 } 3909 3910 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3911 &mod_java_options_args, 3912 &cur_java_options_args); 3913 if (code != JNI_OK) { 3914 return code; 3915 } 3916 3917 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3918 &mod_vm_options_args, 3919 &cur_vm_options_args); 3920 if (code != JNI_OK) { 3921 return code; 3922 } 3923 3924 const char* flags_file = Arguments::get_jvm_flags_file(); 3925 settings_file_specified = (flags_file != nullptr); 3926 3927 if (IgnoreUnrecognizedVMOptions) { 3928 cur_cmd_args->ignoreUnrecognized = true; 3929 cur_java_tool_options_args->ignoreUnrecognized = true; 3930 cur_java_options_args->ignoreUnrecognized = true; 3931 } 3932 3933 // Parse specified settings file 3934 if (settings_file_specified) { 3935 if (!process_settings_file(flags_file, true, 3936 cur_cmd_args->ignoreUnrecognized)) { 3937 return JNI_EINVAL; 3938 } 3939 } else { 3940 #ifdef ASSERT 3941 // Parse default .hotspotrc settings file 3942 if (!process_settings_file(".hotspotrc", false, 3943 cur_cmd_args->ignoreUnrecognized)) { 3944 return JNI_EINVAL; 3945 } 3946 #else 3947 struct stat buf; 3948 if (os::stat(hotspotrc, &buf) == 0) { 3949 needs_hotspotrc_warning = true; 3950 } 3951 #endif 3952 } 3953 3954 if (PrintVMOptions) { 3955 print_options(cur_java_tool_options_args); 3956 print_options(cur_cmd_args); 3957 print_options(cur_java_options_args); 3958 } 3959 3960 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3961 jint result = parse_vm_init_args(cur_vm_options_args, 3962 cur_java_tool_options_args, 3963 cur_java_options_args, 3964 cur_cmd_args); 3965 3966 if (result != JNI_OK) { 3967 return result; 3968 } 3969 3970 // Delay warning until here so that we've had a chance to process 3971 // the -XX:-PrintWarnings flag 3972 if (needs_hotspotrc_warning) { 3973 warning("%s file is present but has been ignored. " 3974 "Run with -XX:Flags=%s to load the file.", 3975 hotspotrc, hotspotrc); 3976 } 3977 3978 if (needs_module_property_warning) { 3979 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3980 " names that are reserved for internal use."); 3981 } 3982 3983 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3984 UNSUPPORTED_OPTION(UseLargePages); 3985 #endif 3986 3987 #if defined(AIX) 3988 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3989 #endif 3990 3991 #ifndef PRODUCT 3992 if (TraceBytecodesAt != 0) { 3993 TraceBytecodes = true; 3994 } 3995 if (CountCompiledCalls) { 3996 if (UseCounterDecay) { 3997 warning("UseCounterDecay disabled because CountCalls is set"); 3998 UseCounterDecay = false; 3999 } 4000 } 4001 #endif // PRODUCT 4002 4003 if (ScavengeRootsInCode == 0) { 4004 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4005 warning("Forcing ScavengeRootsInCode non-zero"); 4006 } 4007 ScavengeRootsInCode = 1; 4008 } 4009 4010 if (!handle_deprecated_print_gc_flags()) { 4011 return JNI_EINVAL; 4012 } 4013 4014 // Set object alignment values. 4015 set_object_alignment(); 4016 4017 #if !INCLUDE_CDS 4018 if (DumpSharedSpaces || RequireSharedSpaces) { 4019 jio_fprintf(defaultStream::error_stream(), 4020 "Shared spaces are not supported in this VM\n"); 4021 return JNI_ERR; 4022 } 4023 if (DumpLoadedClassList != nullptr) { 4024 jio_fprintf(defaultStream::error_stream(), 4025 "DumpLoadedClassList is not supported in this VM\n"); 4026 return JNI_ERR; 4027 } 4028 if ((UseSharedSpaces && xshare_auto_cmd_line) || 4029 log_is_enabled(Info, cds)) { 4030 warning("Shared spaces are not supported in this VM"); 4031 UseSharedSpaces = false; 4032 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4033 } 4034 no_shared_spaces("CDS Disabled"); 4035 #endif // INCLUDE_CDS 4036 4037 // Verify NMT arguments 4038 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 4039 if (lvl == NMT_unknown) { 4040 jio_fprintf(defaultStream::error_stream(), 4041 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n"); 4042 return JNI_ERR; 4043 } 4044 if (PrintNMTStatistics && lvl == NMT_off) { 4045 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 4046 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 4047 } 4048 4049 bool trace_dependencies = log_is_enabled(Debug, dependencies); 4050 if (trace_dependencies && VerifyDependencies) { 4051 warning("dependency logging results may be inflated by VerifyDependencies"); 4052 } 4053 4054 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) || 4055 log_is_enabled(Info, class, load, cause); 4056 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) { 4057 warning("class load cause logging will not produce output without LogClassLoadingCauseFor"); 4058 } 4059 4060 apply_debugger_ergo(); 4061 4062 if (log_is_enabled(Info, arguments)) { 4063 LogStream st(Log(arguments)::info()); 4064 Arguments::print_on(&st); 4065 } 4066 4067 return JNI_OK; 4068 } 4069 4070 jint Arguments::apply_ergo() { 4071 // Set flags based on ergonomics. 4072 jint result = set_ergonomics_flags(); 4073 if (result != JNI_OK) return result; 4074 4075 // Set heap size based on available physical memory 4076 set_heap_size(); 4077 4078 GCConfig::arguments()->initialize(); 4079 4080 set_shared_spaces_flags_and_archive_paths(); 4081 4082 // Initialize Metaspace flags and alignments 4083 Metaspace::ergo_initialize(); 4084 4085 if (!StringDedup::ergo_initialize()) { 4086 return JNI_EINVAL; 4087 } 4088 4089 // Set compiler flags after GC is selected and GC specific 4090 // flags (LoopStripMiningIter) are set. 4091 CompilerConfig::ergo_initialize(); 4092 4093 // Set bytecode rewriting flags 4094 set_bytecode_flags(); 4095 4096 // Set flags if aggressive optimization flags are enabled 4097 jint code = set_aggressive_opts_flags(); 4098 if (code != JNI_OK) { 4099 return code; 4100 } 4101 4102 #ifdef ZERO 4103 // Clear flags not supported on zero. 4104 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4105 #endif // ZERO 4106 4107 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4108 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4109 DebugNonSafepoints = true; 4110 } 4111 4112 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4113 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4114 } 4115 4116 // Treat the odd case where local verification is enabled but remote 4117 // verification is not as if both were enabled. 4118 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4119 log_info(verification)("Turning on remote verification because local verification is on"); 4120 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4121 } 4122 if (!EnableValhalla || (is_interpreter_only() && !is_dumping_archive() && !UseSharedSpaces)) { 4123 // Disable calling convention optimizations if inline types are not supported. 4124 // Also these aren't useful in -Xint. However, don't disable them when dumping or using 4125 // the CDS archive, as the values must match between dumptime and runtime. 4126 InlineTypePassFieldsAsArgs = false; 4127 InlineTypeReturnedAsFields = false; 4128 } 4129 4130 #ifndef PRODUCT 4131 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4132 if (use_vm_log()) { 4133 LogVMOutput = true; 4134 } 4135 } 4136 #endif // PRODUCT 4137 4138 if (PrintCommandLineFlags) { 4139 JVMFlag::printSetFlags(tty); 4140 } 4141 4142 #ifdef COMPILER2 4143 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 4144 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 4145 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 4146 } 4147 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 4148 4149 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 4150 if (!EnableVectorReboxing) { 4151 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 4152 } else { 4153 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 4154 } 4155 } 4156 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 4157 4158 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 4159 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 4160 } 4161 FLAG_SET_DEFAULT(UseVectorStubs, false); 4162 } 4163 #endif // COMPILER2 4164 4165 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 4166 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 4167 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 4168 } 4169 } 4170 return JNI_OK; 4171 } 4172 4173 jint Arguments::adjust_after_os() { 4174 if (UseNUMA) { 4175 if (UseParallelGC) { 4176 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4177 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4178 } 4179 } 4180 } 4181 return JNI_OK; 4182 } 4183 4184 int Arguments::PropertyList_count(SystemProperty* pl) { 4185 int count = 0; 4186 while(pl != nullptr) { 4187 count++; 4188 pl = pl->next(); 4189 } 4190 return count; 4191 } 4192 4193 // Return the number of readable properties. 4194 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4195 int count = 0; 4196 while(pl != nullptr) { 4197 if (pl->readable()) { 4198 count++; 4199 } 4200 pl = pl->next(); 4201 } 4202 return count; 4203 } 4204 4205 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4206 assert(key != nullptr, "just checking"); 4207 SystemProperty* prop; 4208 for (prop = pl; prop != nullptr; prop = prop->next()) { 4209 if (strcmp(key, prop->key()) == 0) return prop->value(); 4210 } 4211 return nullptr; 4212 } 4213 4214 // Return the value of the requested property provided that it is a readable property. 4215 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4216 assert(key != nullptr, "just checking"); 4217 SystemProperty* prop; 4218 // Return the property value if the keys match and the property is not internal or 4219 // it's the special internal property "jdk.boot.class.path.append". 4220 for (prop = pl; prop != nullptr; prop = prop->next()) { 4221 if (strcmp(key, prop->key()) == 0) { 4222 if (!prop->internal()) { 4223 return prop->value(); 4224 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4225 return prop->value(); 4226 } else { 4227 // Property is internal and not jdk.boot.class.path.append so return null. 4228 return nullptr; 4229 } 4230 } 4231 } 4232 return nullptr; 4233 } 4234 4235 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4236 SystemProperty* p = *plist; 4237 if (p == nullptr) { 4238 *plist = new_p; 4239 } else { 4240 while (p->next() != nullptr) { 4241 p = p->next(); 4242 } 4243 p->set_next(new_p); 4244 } 4245 } 4246 4247 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4248 bool writeable, bool internal) { 4249 if (plist == nullptr) 4250 return; 4251 4252 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4253 PropertyList_add(plist, new_p); 4254 } 4255 4256 void Arguments::PropertyList_add(SystemProperty *element) { 4257 PropertyList_add(&_system_properties, element); 4258 } 4259 4260 // This add maintains unique property key in the list. 4261 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4262 PropertyAppendable append, PropertyWriteable writeable, 4263 PropertyInternal internal) { 4264 if (plist == nullptr) 4265 return; 4266 4267 // If property key exists and is writeable, then update with new value. 4268 // Trying to update a non-writeable property is silently ignored. 4269 SystemProperty* prop; 4270 for (prop = *plist; prop != nullptr; prop = prop->next()) { 4271 if (strcmp(k, prop->key()) == 0) { 4272 if (append == AppendProperty) { 4273 prop->append_writeable_value(v); 4274 } else { 4275 prop->set_writeable_value(v); 4276 } 4277 return; 4278 } 4279 } 4280 4281 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4282 } 4283 4284 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4285 // Returns true if all of the source pointed by src has been copied over to 4286 // the destination buffer pointed by buf. Otherwise, returns false. 4287 // Notes: 4288 // 1. If the length (buflen) of the destination buffer excluding the 4289 // null terminator character is not long enough for holding the expanded 4290 // pid characters, it also returns false instead of returning the partially 4291 // expanded one. 4292 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4293 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4294 char* buf, size_t buflen) { 4295 const char* p = src; 4296 char* b = buf; 4297 const char* src_end = &src[srclen]; 4298 char* buf_end = &buf[buflen - 1]; 4299 4300 while (p < src_end && b < buf_end) { 4301 if (*p == '%') { 4302 switch (*(++p)) { 4303 case '%': // "%%" ==> "%" 4304 *b++ = *p++; 4305 break; 4306 case 'p': { // "%p" ==> current process id 4307 // buf_end points to the character before the last character so 4308 // that we could write '\0' to the end of the buffer. 4309 size_t buf_sz = buf_end - b + 1; 4310 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4311 4312 // if jio_snprintf fails or the buffer is not long enough to hold 4313 // the expanded pid, returns false. 4314 if (ret < 0 || ret >= (int)buf_sz) { 4315 return false; 4316 } else { 4317 b += ret; 4318 assert(*b == '\0', "fail in copy_expand_pid"); 4319 if (p == src_end && b == buf_end + 1) { 4320 // reach the end of the buffer. 4321 return true; 4322 } 4323 } 4324 p++; 4325 break; 4326 } 4327 default : 4328 *b++ = '%'; 4329 } 4330 } else { 4331 *b++ = *p++; 4332 } 4333 } 4334 *b = '\0'; 4335 return (p == src_end); // return false if not all of the source was copied 4336 }