1 /* 2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/cds_globals.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/filemap.hpp" 29 #include "classfile/classLoader.hpp" 30 #include "classfile/javaAssertions.hpp" 31 #include "classfile/moduleEntry.hpp" 32 #include "classfile/stringTable.hpp" 33 #include "classfile/symbolTable.hpp" 34 #include "compiler/compilerDefinitions.hpp" 35 #include "gc/shared/gcArguments.hpp" 36 #include "gc/shared/gcConfig.hpp" 37 #include "gc/shared/genArguments.hpp" 38 #include "gc/shared/stringdedup/stringDedup.hpp" 39 #include "gc/shared/tlab_globals.hpp" 40 #include "jvm.h" 41 #include "logging/log.hpp" 42 #include "logging/logConfiguration.hpp" 43 #include "logging/logStream.hpp" 44 #include "logging/logTag.hpp" 45 #include "memory/allocation.inline.hpp" 46 #include "nmt/nmtCommon.hpp" 47 #include "oops/compressedKlass.hpp" 48 #include "oops/instanceKlass.hpp" 49 #include "oops/oop.inline.hpp" 50 #include "prims/jvmtiAgentList.hpp" 51 #include "prims/jvmtiExport.hpp" 52 #include "runtime/arguments.hpp" 53 #include "runtime/flags/jvmFlag.hpp" 54 #include "runtime/flags/jvmFlagAccess.hpp" 55 #include "runtime/flags/jvmFlagLimit.hpp" 56 #include "runtime/globals_extension.hpp" 57 #include "runtime/java.hpp" 58 #include "runtime/os.hpp" 59 #include "runtime/safepoint.hpp" 60 #include "runtime/safepointMechanism.hpp" 61 #include "runtime/synchronizer.hpp" 62 #include "runtime/vm_version.hpp" 63 #include "services/management.hpp" 64 #include "utilities/align.hpp" 65 #include "utilities/checkedCast.hpp" 66 #include "utilities/debug.hpp" 67 #include "utilities/defaultStream.hpp" 68 #include "utilities/macros.hpp" 69 #include "utilities/parseInteger.hpp" 70 #include "utilities/powerOfTwo.hpp" 71 #include "utilities/stringUtils.hpp" 72 #include "utilities/systemMemoryBarrier.hpp" 73 #if INCLUDE_JFR 74 #include "jfr/jfr.hpp" 75 #endif 76 77 #include <limits> 78 79 static const char _default_java_launcher[] = "generic"; 80 81 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher 82 83 char* Arguments::_jvm_flags_file = nullptr; 84 char** Arguments::_jvm_flags_array = nullptr; 85 int Arguments::_num_jvm_flags = 0; 86 char** Arguments::_jvm_args_array = nullptr; 87 int Arguments::_num_jvm_args = 0; 88 char* Arguments::_java_command = nullptr; 89 SystemProperty* Arguments::_system_properties = nullptr; 90 size_t Arguments::_conservative_max_heap_alignment = 0; 91 Arguments::Mode Arguments::_mode = _mixed; 92 const char* Arguments::_java_vendor_url_bug = nullptr; 93 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 94 bool Arguments::_sun_java_launcher_is_altjvm = false; 95 96 // These parameters are reset in method parse_vm_init_args() 97 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 98 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 99 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 100 bool Arguments::_ClipInlining = ClipInlining; 101 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 102 103 bool Arguments::_enable_preview = false; 104 105 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 }; 106 107 // These are not set by the JDK's built-in launchers, but they can be set by 108 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 109 // JavaVMOption in jni.h. 110 abort_hook_t Arguments::_abort_hook = nullptr; 111 exit_hook_t Arguments::_exit_hook = nullptr; 112 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr; 113 114 115 SystemProperty *Arguments::_sun_boot_library_path = nullptr; 116 SystemProperty *Arguments::_java_library_path = nullptr; 117 SystemProperty *Arguments::_java_home = nullptr; 118 SystemProperty *Arguments::_java_class_path = nullptr; 119 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr; 120 SystemProperty *Arguments::_vm_info = nullptr; 121 122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr; 123 PathString *Arguments::_boot_class_path = nullptr; 124 bool Arguments::_has_jimage = false; 125 126 char* Arguments::_ext_dirs = nullptr; 127 128 // True if -Xshare:auto option was specified. 129 static bool xshare_auto_cmd_line = false; 130 131 // True if -Xint/-Xmixed/-Xcomp were specified 132 static bool mode_flag_cmd_line = false; 133 134 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 135 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 136 if (new_value == nullptr) { 137 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 138 return false; 139 } 140 if (_value != nullptr) { 141 FreeHeap(_value); 142 } 143 _value = new_value; 144 strcpy(_value, value); 145 return true; 146 } 147 148 void PathString::append_value(const char *value) { 149 char *sp; 150 size_t len = 0; 151 if (value != nullptr) { 152 len = strlen(value); 153 if (_value != nullptr) { 154 len += strlen(_value); 155 } 156 sp = AllocateHeap(len+2, mtArguments); 157 assert(sp != nullptr, "Unable to allocate space for new append path value"); 158 if (sp != nullptr) { 159 if (_value != nullptr) { 160 strcpy(sp, _value); 161 strcat(sp, os::path_separator()); 162 strcat(sp, value); 163 FreeHeap(_value); 164 } else { 165 strcpy(sp, value); 166 } 167 _value = sp; 168 } 169 } 170 } 171 172 PathString::PathString(const char* value) { 173 if (value == nullptr) { 174 _value = nullptr; 175 } else { 176 _value = AllocateHeap(strlen(value)+1, mtArguments); 177 strcpy(_value, value); 178 } 179 } 180 181 PathString::~PathString() { 182 if (_value != nullptr) { 183 FreeHeap(_value); 184 _value = nullptr; 185 } 186 } 187 188 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 189 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value"); 190 size_t len = strlen(module_name) + 1; 191 _module_name = AllocateHeap(len, mtInternal); 192 strncpy(_module_name, module_name, len); // copy the trailing null 193 _path = new PathString(path); 194 } 195 196 ModulePatchPath::~ModulePatchPath() { 197 if (_module_name != nullptr) { 198 FreeHeap(_module_name); 199 _module_name = nullptr; 200 } 201 if (_path != nullptr) { 202 delete _path; 203 _path = nullptr; 204 } 205 } 206 207 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 208 if (key == nullptr) { 209 _key = nullptr; 210 } else { 211 _key = AllocateHeap(strlen(key)+1, mtArguments); 212 strcpy(_key, key); 213 } 214 _next = nullptr; 215 _internal = internal; 216 _writeable = writeable; 217 } 218 219 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 220 // part of the option string. 221 static bool match_option(const JavaVMOption *option, const char* name, 222 const char** tail) { 223 size_t len = strlen(name); 224 if (strncmp(option->optionString, name, len) == 0) { 225 *tail = option->optionString + len; 226 return true; 227 } else { 228 return false; 229 } 230 } 231 232 // Check if 'option' matches 'name'. No "tail" is allowed. 233 static bool match_option(const JavaVMOption *option, const char* name) { 234 const char* tail = nullptr; 235 bool result = match_option(option, name, &tail); 236 if (tail != nullptr && *tail == '\0') { 237 return result; 238 } else { 239 return false; 240 } 241 } 242 243 // Return true if any of the strings in null-terminated array 'names' matches. 244 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 245 // the option must match exactly. 246 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 247 bool tail_allowed) { 248 for (/* empty */; *names != nullptr; ++names) { 249 if (match_option(option, *names, tail)) { 250 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 251 return true; 252 } 253 } 254 } 255 return false; 256 } 257 258 #if INCLUDE_JFR 259 static bool _has_jfr_option = false; // is using JFR 260 261 // return true on failure 262 static bool match_jfr_option(const JavaVMOption** option) { 263 assert((*option)->optionString != nullptr, "invariant"); 264 char* tail = nullptr; 265 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 266 _has_jfr_option = true; 267 return Jfr::on_start_flight_recording_option(option, tail); 268 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 269 _has_jfr_option = true; 270 return Jfr::on_flight_recorder_option(option, tail); 271 } 272 return false; 273 } 274 275 bool Arguments::has_jfr_option() { 276 return _has_jfr_option; 277 } 278 #endif 279 280 static void logOption(const char* opt) { 281 if (PrintVMOptions) { 282 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 283 } 284 } 285 286 bool needs_module_property_warning = false; 287 288 #define MODULE_PROPERTY_PREFIX "jdk.module." 289 #define MODULE_PROPERTY_PREFIX_LEN 11 290 #define ADDEXPORTS "addexports" 291 #define ADDEXPORTS_LEN 10 292 #define ADDREADS "addreads" 293 #define ADDREADS_LEN 8 294 #define ADDOPENS "addopens" 295 #define ADDOPENS_LEN 8 296 #define PATCH "patch" 297 #define PATCH_LEN 5 298 #define ADDMODS "addmods" 299 #define ADDMODS_LEN 7 300 #define LIMITMODS "limitmods" 301 #define LIMITMODS_LEN 9 302 #define PATH "path" 303 #define PATH_LEN 4 304 #define UPGRADE_PATH "upgrade.path" 305 #define UPGRADE_PATH_LEN 12 306 #define ENABLE_NATIVE_ACCESS "enable.native.access" 307 #define ENABLE_NATIVE_ACCESS_LEN 20 308 309 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 310 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 311 return ((strncmp(option, property, len) == 0) && 312 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 313 } 314 315 // Return true if property starts with "jdk.module." and its ensuing chars match 316 // any of the reserved module properties. 317 // property should be passed without the leading "-D". 318 bool Arguments::is_internal_module_property(const char* property) { 319 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 320 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 321 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 322 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 323 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 324 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 325 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 326 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 327 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 328 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 329 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 330 return true; 331 } 332 } 333 return false; 334 } 335 336 // Process java launcher properties. 337 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 338 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 339 // Must do this before setting up other system properties, 340 // as some of them may depend on launcher type. 341 for (int index = 0; index < args->nOptions; index++) { 342 const JavaVMOption* option = args->options + index; 343 const char* tail; 344 345 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 346 process_java_launcher_argument(tail, option->extraInfo); 347 continue; 348 } 349 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 350 if (strcmp(tail, "true") == 0) { 351 _sun_java_launcher_is_altjvm = true; 352 } 353 continue; 354 } 355 } 356 } 357 358 // Initialize system properties key and value. 359 void Arguments::init_system_properties() { 360 361 // Set up _boot_class_path which is not a property but 362 // relies heavily on argument processing and the jdk.boot.class.path.append 363 // property. It is used to store the underlying boot class path. 364 _boot_class_path = new PathString(nullptr); 365 366 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 367 "Java Virtual Machine Specification", false)); 368 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 370 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 371 372 // Initialize the vm.info now, but it will need updating after argument parsing. 373 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 374 375 // Following are JVMTI agent writable properties. 376 // Properties values are set to nullptr and they are 377 // os specific they are initialized in os::init_system_properties_values(). 378 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true); 379 _java_library_path = new SystemProperty("java.library.path", nullptr, true); 380 _java_home = new SystemProperty("java.home", nullptr, true); 381 _java_class_path = new SystemProperty("java.class.path", "", true); 382 // jdk.boot.class.path.append is a non-writeable, internal property. 383 // It can only be set by either: 384 // - -Xbootclasspath/a: 385 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 386 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true); 387 388 // Add to System Property list. 389 PropertyList_add(&_system_properties, _sun_boot_library_path); 390 PropertyList_add(&_system_properties, _java_library_path); 391 PropertyList_add(&_system_properties, _java_home); 392 PropertyList_add(&_system_properties, _java_class_path); 393 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 394 PropertyList_add(&_system_properties, _vm_info); 395 396 // Set OS specific system properties values 397 os::init_system_properties_values(); 398 } 399 400 // Update/Initialize System properties after JDK version number is known 401 void Arguments::init_version_specific_system_properties() { 402 enum { bufsz = 16 }; 403 char buffer[bufsz]; 404 const char* spec_vendor = "Oracle Corporation"; 405 uint32_t spec_version = JDK_Version::current().major_version(); 406 407 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 408 409 PropertyList_add(&_system_properties, 410 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 411 PropertyList_add(&_system_properties, 412 new SystemProperty("java.vm.specification.version", buffer, false)); 413 PropertyList_add(&_system_properties, 414 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 415 } 416 417 /* 418 * -XX argument processing: 419 * 420 * -XX arguments are defined in several places, such as: 421 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 422 * -XX arguments are parsed in parse_argument(). 423 * -XX argument bounds checking is done in check_vm_args_consistency(). 424 * 425 * Over time -XX arguments may change. There are mechanisms to handle common cases: 426 * 427 * ALIASED: An option that is simply another name for another option. This is often 428 * part of the process of deprecating a flag, but not all aliases need 429 * to be deprecated. 430 * 431 * Create an alias for an option by adding the old and new option names to the 432 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 433 * 434 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 435 * support may be removed in the future. Both regular and aliased options may be 436 * deprecated. 437 * 438 * Add a deprecation warning for an option (or alias) by adding an entry in the 439 * "special_jvm_flags" table and setting the "deprecated_in" field. 440 * Often an option "deprecated" in one major release will 441 * be made "obsolete" in the next. In this case the entry should also have its 442 * "obsolete_in" field set. 443 * 444 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 445 * on the command line. A warning is printed to let the user know that option might not 446 * be accepted in the future. 447 * 448 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 449 * table and setting the "obsolete_in" field. 450 * 451 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 452 * to the current JDK version. The system will flatly refuse to admit the existence of 453 * the flag. This allows a flag to die automatically over JDK releases. 454 * 455 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 456 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 457 * - Newly obsolete or expired deprecated options should have their global variable 458 * definitions removed (from globals.hpp, etc) and related implementations removed. 459 * 460 * Recommended approach for removing options: 461 * 462 * To remove options commonly used by customers (e.g. product -XX options), use 463 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 464 * 465 * To remove internal options (e.g. diagnostic, experimental, develop options), use 466 * a 2-step model adding major release numbers to the obsolete and expire columns. 467 * 468 * To change the name of an option, use the alias table as well as a 2-step 469 * model adding major release numbers to the deprecate and expire columns. 470 * Think twice about aliasing commonly used customer options. 471 * 472 * There are times when it is appropriate to leave a future release number as undefined. 473 * 474 * Tests: Aliases should be tested in VMAliasOptions.java. 475 * Deprecated options should be tested in VMDeprecatedOptions.java. 476 */ 477 478 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 479 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 480 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 481 // the command-line as usual, but will issue a warning. 482 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 483 // the command-line, while issuing a warning and ignoring the flag value. 484 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 485 // existence of the flag. 486 // 487 // MANUAL CLEANUP ON JDK VERSION UPDATES: 488 // This table ensures that the handling of options will update automatically when the JDK 489 // version is incremented, but the source code needs to be cleanup up manually: 490 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 491 // variable should be removed, as well as users of the variable. 492 // - As "deprecated" options age into "obsolete" options, move the entry into the 493 // "Obsolete Flags" section of the table. 494 // - All expired options should be removed from the table. 495 static SpecialFlag const special_jvm_flags[] = { 496 // -------------- Deprecated Flags -------------- 497 // --- Non-alias flags - sorted by obsolete_in then expired_in: 498 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 499 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 500 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() }, 501 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 502 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 503 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 504 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 505 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 506 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 507 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 508 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 509 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 510 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 511 512 // -------------- Obsolete Flags - sorted by expired_in -------------- 513 514 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 515 516 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 517 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 518 #if defined(X86) 519 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 520 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 521 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 522 #endif // X86 523 524 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 525 { "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 526 #ifdef ASSERT 527 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 528 #endif 529 530 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 531 // These entries will generate build errors. Their purpose is to test the macros. 532 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 533 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 534 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 535 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 536 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 537 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 538 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 539 #endif 540 541 { nullptr, JDK_Version(0), JDK_Version(0) } 542 }; 543 544 // Flags that are aliases for other flags. 545 typedef struct { 546 const char* alias_name; 547 const char* real_name; 548 } AliasedFlag; 549 550 static AliasedFlag const aliased_jvm_flags[] = { 551 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 552 { nullptr, nullptr} 553 }; 554 555 // Return true if "v" is less than "other", where "other" may be "undefined". 556 static bool version_less_than(JDK_Version v, JDK_Version other) { 557 assert(!v.is_undefined(), "must be defined"); 558 if (!other.is_undefined() && v.compare(other) >= 0) { 559 return false; 560 } else { 561 return true; 562 } 563 } 564 565 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 566 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 567 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 568 flag = special_jvm_flags[i]; 569 return true; 570 } 571 } 572 return false; 573 } 574 575 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 576 assert(version != nullptr, "Must provide a version buffer"); 577 SpecialFlag flag; 578 if (lookup_special_flag(flag_name, flag)) { 579 if (!flag.obsolete_in.is_undefined()) { 580 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 581 *version = flag.obsolete_in; 582 // This flag may have been marked for obsoletion in this version, but we may not 583 // have actually removed it yet. Rather than ignoring it as soon as we reach 584 // this version we allow some time for the removal to happen. So if the flag 585 // still actually exists we process it as normal, but issue an adjusted warning. 586 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 587 if (real_flag != nullptr) { 588 char version_str[256]; 589 version->to_string(version_str, sizeof(version_str)); 590 warning("Temporarily processing option %s; support is scheduled for removal in %s", 591 flag_name, version_str); 592 return false; 593 } 594 return true; 595 } 596 } 597 } 598 return false; 599 } 600 601 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 602 assert(version != nullptr, "Must provide a version buffer"); 603 SpecialFlag flag; 604 if (lookup_special_flag(flag_name, flag)) { 605 if (!flag.deprecated_in.is_undefined()) { 606 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 607 version_less_than(JDK_Version::current(), flag.expired_in)) { 608 *version = flag.deprecated_in; 609 return 1; 610 } else { 611 return -1; 612 } 613 } 614 } 615 return 0; 616 } 617 618 const char* Arguments::real_flag_name(const char *flag_name) { 619 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) { 620 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 621 if (strcmp(flag_status.alias_name, flag_name) == 0) { 622 return flag_status.real_name; 623 } 624 } 625 return flag_name; 626 } 627 628 #ifdef ASSERT 629 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 630 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 631 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 632 return true; 633 } 634 } 635 return false; 636 } 637 638 // Verifies the correctness of the entries in the special_jvm_flags table. 639 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 640 // version being earlier than the deprecation version, then a warning is issued 641 // and verification fails - by returning false. If it is detected that the table 642 // is out of date, with respect to the current version, then ideally a warning is 643 // issued but verification does not fail. This allows the VM to operate when the 644 // version is first updated, without needing to update all the impacted flags at 645 // the same time. In practice we can't issue the warning immediately when the version 646 // is updated as it occurs for every test and some tests are not prepared to handle 647 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 648 // if the check_globals flag is true, and in addition allow a grace period and only 649 // check for stale flags when we hit build 25 (which is far enough into the 6 month 650 // release cycle that all flag updates should have been processed, whilst still 651 // leaving time to make the change before RDP2). 652 // We use a gtest to call this, passing true, so that we can detect stale flags before 653 // the end of the release cycle. 654 655 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 656 657 bool Arguments::verify_special_jvm_flags(bool check_globals) { 658 bool success = true; 659 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 660 const SpecialFlag& flag = special_jvm_flags[i]; 661 if (lookup_special_flag(flag.name, i)) { 662 warning("Duplicate special flag declaration \"%s\"", flag.name); 663 success = false; 664 } 665 if (flag.deprecated_in.is_undefined() && 666 flag.obsolete_in.is_undefined()) { 667 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 668 success = false; 669 } 670 671 if (!flag.deprecated_in.is_undefined()) { 672 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 673 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 674 success = false; 675 } 676 677 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 678 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 679 success = false; 680 } 681 } 682 683 if (!flag.obsolete_in.is_undefined()) { 684 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 685 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 686 success = false; 687 } 688 689 // if flag has become obsolete it should not have a "globals" flag defined anymore. 690 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 691 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 692 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 693 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 694 success = false; 695 } 696 } 697 698 } else if (!flag.expired_in.is_undefined()) { 699 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 700 success = false; 701 } 702 703 if (!flag.expired_in.is_undefined()) { 704 // if flag has become expired it should not have a "globals" flag defined anymore. 705 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 706 !version_less_than(JDK_Version::current(), flag.expired_in)) { 707 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 708 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 709 success = false; 710 } 711 } 712 } 713 } 714 return success; 715 } 716 #endif 717 718 bool Arguments::atojulong(const char *s, julong* result) { 719 return parse_integer(s, result); 720 } 721 722 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 723 if (size < min_size) return arg_too_small; 724 if (size > max_size) return arg_too_big; 725 return arg_in_range; 726 } 727 728 // Describe an argument out of range error 729 void Arguments::describe_range_error(ArgsRange errcode) { 730 switch(errcode) { 731 case arg_too_big: 732 jio_fprintf(defaultStream::error_stream(), 733 "The specified size exceeds the maximum " 734 "representable size.\n"); 735 break; 736 case arg_too_small: 737 case arg_unreadable: 738 case arg_in_range: 739 // do nothing for now 740 break; 741 default: 742 ShouldNotReachHere(); 743 } 744 } 745 746 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 747 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 748 return true; 749 } else { 750 return false; 751 } 752 } 753 754 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 755 // strtod allows leading whitespace, but our flag format does not. 756 if (*value == '\0' || isspace((unsigned char) *value)) { 757 return false; 758 } 759 char* end; 760 errno = 0; 761 double v = strtod(value, &end); 762 if ((errno != 0) || (*end != 0)) { 763 return false; 764 } 765 if (g_isnan(v) || !g_isfinite(v)) { 766 // Currently we cannot handle these special values. 767 return false; 768 } 769 770 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 771 return true; 772 } 773 return false; 774 } 775 776 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 777 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 778 779 if (flag->is_int()) { 780 int v; 781 if (parse_integer(value, &v)) { 782 result = JVMFlagAccess::set_int(flag, &v, origin); 783 } 784 } else if (flag->is_uint()) { 785 uint v; 786 if (parse_integer(value, &v)) { 787 result = JVMFlagAccess::set_uint(flag, &v, origin); 788 } 789 } else if (flag->is_intx()) { 790 intx v; 791 if (parse_integer(value, &v)) { 792 result = JVMFlagAccess::set_intx(flag, &v, origin); 793 } 794 } else if (flag->is_uintx()) { 795 uintx v; 796 if (parse_integer(value, &v)) { 797 result = JVMFlagAccess::set_uintx(flag, &v, origin); 798 } 799 } else if (flag->is_uint64_t()) { 800 uint64_t v; 801 if (parse_integer(value, &v)) { 802 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 803 } 804 } else if (flag->is_size_t()) { 805 size_t v; 806 if (parse_integer(value, &v)) { 807 result = JVMFlagAccess::set_size_t(flag, &v, origin); 808 } 809 } 810 811 return result == JVMFlag::SUCCESS; 812 } 813 814 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 815 if (value[0] == '\0') { 816 value = nullptr; 817 } 818 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 819 // Contract: JVMFlag always returns a pointer that needs freeing. 820 FREE_C_HEAP_ARRAY(char, value); 821 return true; 822 } 823 824 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 825 const char* old_value = ""; 826 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 827 size_t old_len = old_value != nullptr ? strlen(old_value) : 0; 828 size_t new_len = strlen(new_value); 829 const char* value; 830 char* free_this_too = nullptr; 831 if (old_len == 0) { 832 value = new_value; 833 } else if (new_len == 0) { 834 value = old_value; 835 } else { 836 size_t length = old_len + 1 + new_len + 1; 837 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 838 // each new setting adds another LINE to the switch: 839 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 840 value = buf; 841 free_this_too = buf; 842 } 843 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 844 // JVMFlag always returns a pointer that needs freeing. 845 FREE_C_HEAP_ARRAY(char, value); 846 // JVMFlag made its own copy, so I must delete my own temp. buffer. 847 FREE_C_HEAP_ARRAY(char, free_this_too); 848 return true; 849 } 850 851 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 852 const char* real_name = real_flag_name(arg); 853 JDK_Version since = JDK_Version(); 854 switch (is_deprecated_flag(arg, &since)) { 855 case -1: { 856 // Obsolete or expired, so don't process normally, 857 // but allow for an obsolete flag we're still 858 // temporarily allowing. 859 if (!is_obsolete_flag(arg, &since)) { 860 return real_name; 861 } 862 // Note if we're not considered obsolete then we can't be expired either 863 // as obsoletion must come first. 864 return nullptr; 865 } 866 case 0: 867 return real_name; 868 case 1: { 869 char version[256]; 870 since.to_string(version, sizeof(version)); 871 if (real_name != arg) { 872 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 873 arg, version, real_name); 874 } else { 875 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 876 arg, version); 877 } 878 return real_name; 879 } 880 } 881 ShouldNotReachHere(); 882 return nullptr; 883 } 884 885 #define BUFLEN 255 886 887 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 888 char name_copied[BUFLEN+1]; 889 if (name[name_length] != 0) { 890 if (name_length > BUFLEN) { 891 return nullptr; 892 } else { 893 strncpy(name_copied, name, name_length); 894 name_copied[name_length] = '\0'; 895 name = name_copied; 896 } 897 } 898 899 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 900 if (real_name == nullptr) { 901 return nullptr; 902 } 903 JVMFlag* flag = JVMFlag::find_flag(real_name); 904 return flag; 905 } 906 907 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 908 bool is_bool = false; 909 bool bool_val = false; 910 char c = *arg; 911 if (c == '+' || c == '-') { 912 is_bool = true; 913 bool_val = (c == '+'); 914 arg++; 915 } 916 917 const char* name = arg; 918 while (true) { 919 c = *arg; 920 if (isalnum(c) || (c == '_')) { 921 ++arg; 922 } else { 923 break; 924 } 925 } 926 927 size_t name_len = size_t(arg - name); 928 if (name_len == 0) { 929 return false; 930 } 931 932 JVMFlag* flag = find_jvm_flag(name, name_len); 933 if (flag == nullptr) { 934 return false; 935 } 936 937 if (is_bool) { 938 if (*arg != 0) { 939 // Error -- extra characters such as -XX:+BoolFlag=123 940 return false; 941 } 942 return set_bool_flag(flag, bool_val, origin); 943 } 944 945 if (arg[0] == '=') { 946 const char* value = arg + 1; 947 if (flag->is_ccstr()) { 948 if (flag->ccstr_accumulates()) { 949 return append_to_string_flag(flag, value, origin); 950 } else { 951 return set_string_flag(flag, value, origin); 952 } 953 } else if (flag->is_double()) { 954 return set_fp_numeric_flag(flag, value, origin); 955 } else { 956 return set_numeric_flag(flag, value, origin); 957 } 958 } 959 960 if (arg[0] == ':' && arg[1] == '=') { 961 // -XX:Foo:=xxx will reset the string flag to the given value. 962 const char* value = arg + 2; 963 return set_string_flag(flag, value, origin); 964 } 965 966 return false; 967 } 968 969 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 970 assert(bldarray != nullptr, "illegal argument"); 971 972 if (arg == nullptr) { 973 return; 974 } 975 976 int new_count = *count + 1; 977 978 // expand the array and add arg to the last element 979 if (*bldarray == nullptr) { 980 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 981 } else { 982 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 983 } 984 (*bldarray)[*count] = os::strdup_check_oom(arg); 985 *count = new_count; 986 } 987 988 void Arguments::build_jvm_args(const char* arg) { 989 add_string(&_jvm_args_array, &_num_jvm_args, arg); 990 } 991 992 void Arguments::build_jvm_flags(const char* arg) { 993 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 994 } 995 996 // utility function to return a string that concatenates all 997 // strings in a given char** array 998 const char* Arguments::build_resource_string(char** args, int count) { 999 if (args == nullptr || count == 0) { 1000 return nullptr; 1001 } 1002 size_t length = 0; 1003 for (int i = 0; i < count; i++) { 1004 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character 1005 } 1006 char* s = NEW_RESOURCE_ARRAY(char, length); 1007 char* dst = s; 1008 for (int j = 0; j < count; j++) { 1009 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character 1010 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character 1011 dst += offset; 1012 length -= offset; 1013 } 1014 return (const char*) s; 1015 } 1016 1017 void Arguments::print_on(outputStream* st) { 1018 st->print_cr("VM Arguments:"); 1019 if (num_jvm_flags() > 0) { 1020 st->print("jvm_flags: "); print_jvm_flags_on(st); 1021 st->cr(); 1022 } 1023 if (num_jvm_args() > 0) { 1024 st->print("jvm_args: "); print_jvm_args_on(st); 1025 st->cr(); 1026 } 1027 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1028 if (_java_class_path != nullptr) { 1029 char* path = _java_class_path->value(); 1030 size_t len = strlen(path); 1031 st->print("java_class_path (initial): "); 1032 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1033 if (len == 0) { 1034 st->print_raw_cr("<not set>"); 1035 } else { 1036 st->print_raw_cr(path, len); 1037 } 1038 } 1039 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1040 } 1041 1042 void Arguments::print_summary_on(outputStream* st) { 1043 // Print the command line. Environment variables that are helpful for 1044 // reproducing the problem are written later in the hs_err file. 1045 // flags are from setting file 1046 if (num_jvm_flags() > 0) { 1047 st->print_raw("Settings File: "); 1048 print_jvm_flags_on(st); 1049 st->cr(); 1050 } 1051 // args are the command line and environment variable arguments. 1052 st->print_raw("Command Line: "); 1053 if (num_jvm_args() > 0) { 1054 print_jvm_args_on(st); 1055 } 1056 // this is the classfile and any arguments to the java program 1057 if (java_command() != nullptr) { 1058 st->print("%s", java_command()); 1059 } 1060 st->cr(); 1061 } 1062 1063 void Arguments::print_jvm_flags_on(outputStream* st) { 1064 if (_num_jvm_flags > 0) { 1065 for (int i=0; i < _num_jvm_flags; i++) { 1066 st->print("%s ", _jvm_flags_array[i]); 1067 } 1068 } 1069 } 1070 1071 void Arguments::print_jvm_args_on(outputStream* st) { 1072 if (_num_jvm_args > 0) { 1073 for (int i=0; i < _num_jvm_args; i++) { 1074 st->print("%s ", _jvm_args_array[i]); 1075 } 1076 } 1077 } 1078 1079 bool Arguments::process_argument(const char* arg, 1080 jboolean ignore_unrecognized, 1081 JVMFlagOrigin origin) { 1082 JDK_Version since = JDK_Version(); 1083 1084 if (parse_argument(arg, origin)) { 1085 return true; 1086 } 1087 1088 // Determine if the flag has '+', '-', or '=' characters. 1089 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1090 const char* const argname = has_plus_minus ? arg + 1 : arg; 1091 1092 size_t arg_len; 1093 const char* equal_sign = strchr(argname, '='); 1094 if (equal_sign == nullptr) { 1095 arg_len = strlen(argname); 1096 } else { 1097 arg_len = equal_sign - argname; 1098 } 1099 1100 // Only make the obsolete check for valid arguments. 1101 if (arg_len <= BUFLEN) { 1102 // Construct a string which consists only of the argument name without '+', '-', or '='. 1103 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1104 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1105 if (is_obsolete_flag(stripped_argname, &since)) { 1106 char version[256]; 1107 since.to_string(version, sizeof(version)); 1108 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1109 return true; 1110 } 1111 } 1112 1113 // For locked flags, report a custom error message if available. 1114 // Otherwise, report the standard unrecognized VM option. 1115 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1116 if (found_flag != nullptr) { 1117 char locked_message_buf[BUFLEN]; 1118 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1119 if (strlen(locked_message_buf) != 0) { 1120 #ifdef PRODUCT 1121 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD; 1122 if (ignore_unrecognized && mismatched) { 1123 return true; 1124 } 1125 #endif 1126 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1127 } 1128 if (found_flag->is_bool() && !has_plus_minus) { 1129 jio_fprintf(defaultStream::error_stream(), 1130 "Missing +/- setting for VM option '%s'\n", argname); 1131 } else if (!found_flag->is_bool() && has_plus_minus) { 1132 jio_fprintf(defaultStream::error_stream(), 1133 "Unexpected +/- setting in VM option '%s'\n", argname); 1134 } else { 1135 jio_fprintf(defaultStream::error_stream(), 1136 "Improperly specified VM option '%s'\n", argname); 1137 } 1138 } else { 1139 if (ignore_unrecognized) { 1140 return true; 1141 } 1142 jio_fprintf(defaultStream::error_stream(), 1143 "Unrecognized VM option '%s'\n", argname); 1144 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1145 if (fuzzy_matched != nullptr) { 1146 jio_fprintf(defaultStream::error_stream(), 1147 "Did you mean '%s%s%s'?\n", 1148 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1149 fuzzy_matched->name(), 1150 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1151 } 1152 } 1153 1154 // allow for commandline "commenting out" options like -XX:#+Verbose 1155 return arg[0] == '#'; 1156 } 1157 1158 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1159 FILE* stream = os::fopen(file_name, "rb"); 1160 if (stream == nullptr) { 1161 if (should_exist) { 1162 jio_fprintf(defaultStream::error_stream(), 1163 "Could not open settings file %s\n", file_name); 1164 return false; 1165 } else { 1166 return true; 1167 } 1168 } 1169 1170 char token[1024]; 1171 int pos = 0; 1172 1173 bool in_white_space = true; 1174 bool in_comment = false; 1175 bool in_quote = false; 1176 int quote_c = 0; 1177 bool result = true; 1178 1179 int c = getc(stream); 1180 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1181 if (in_white_space) { 1182 if (in_comment) { 1183 if (c == '\n') in_comment = false; 1184 } else { 1185 if (c == '#') in_comment = true; 1186 else if (!isspace((unsigned char) c)) { 1187 in_white_space = false; 1188 token[pos++] = checked_cast<char>(c); 1189 } 1190 } 1191 } else { 1192 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) { 1193 // token ends at newline, or at unquoted whitespace 1194 // this allows a way to include spaces in string-valued options 1195 token[pos] = '\0'; 1196 logOption(token); 1197 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1198 build_jvm_flags(token); 1199 pos = 0; 1200 in_white_space = true; 1201 in_quote = false; 1202 } else if (!in_quote && (c == '\'' || c == '"')) { 1203 in_quote = true; 1204 quote_c = c; 1205 } else if (in_quote && (c == quote_c)) { 1206 in_quote = false; 1207 } else { 1208 token[pos++] = checked_cast<char>(c); 1209 } 1210 } 1211 c = getc(stream); 1212 } 1213 if (pos > 0) { 1214 token[pos] = '\0'; 1215 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1216 build_jvm_flags(token); 1217 } 1218 fclose(stream); 1219 return result; 1220 } 1221 1222 //============================================================================================================= 1223 // Parsing of properties (-D) 1224 1225 const char* Arguments::get_property(const char* key) { 1226 return PropertyList_get_value(system_properties(), key); 1227 } 1228 1229 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1230 const char* eq = strchr(prop, '='); 1231 const char* key; 1232 const char* value = ""; 1233 1234 if (eq == nullptr) { 1235 // property doesn't have a value, thus use passed string 1236 key = prop; 1237 } else { 1238 // property have a value, thus extract it and save to the 1239 // allocated string 1240 size_t key_len = eq - prop; 1241 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1242 1243 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1244 key = tmp_key; 1245 1246 value = &prop[key_len + 1]; 1247 } 1248 1249 if (internal == ExternalProperty) { 1250 CDSConfig::check_incompatible_property(key, value); 1251 } 1252 1253 if (strcmp(key, "java.compiler") == 0) { 1254 // we no longer support java.compiler system property, log a warning and let it get 1255 // passed to Java, like any other system property 1256 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) { 1257 // for applications using NONE or empty value, log a more informative message 1258 warning("The java.compiler system property is obsolete and no longer supported, use -Xint"); 1259 } else { 1260 warning("The java.compiler system property is obsolete and no longer supported."); 1261 } 1262 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1263 // sun.java.launcher.is_altjvm property is 1264 // private and is processed in process_sun_java_launcher_properties(); 1265 // the sun.java.launcher property is passed on to the java application 1266 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1267 // append is true, writable is true, internal is false 1268 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1269 WriteableProperty, ExternalProperty); 1270 } else { 1271 if (strcmp(key, "sun.java.command") == 0) { 1272 char *old_java_command = _java_command; 1273 _java_command = os::strdup_check_oom(value, mtArguments); 1274 if (old_java_command != nullptr) { 1275 os::free(old_java_command); 1276 } 1277 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1278 // If this property is set on the command line then its value will be 1279 // displayed in VM error logs as the URL at which to submit such logs. 1280 // Normally the URL displayed in error logs is different from the value 1281 // of this system property, so a different property should have been 1282 // used here, but we leave this as-is in case someone depends upon it. 1283 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1284 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1285 // its value without going through the property list or making a Java call. 1286 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1287 if (old_java_vendor_url_bug != nullptr) { 1288 os::free((void *)old_java_vendor_url_bug); 1289 } 1290 } 1291 1292 // Create new property and add at the end of the list 1293 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1294 } 1295 1296 if (key != prop) { 1297 // SystemProperty copy passed value, thus free previously allocated 1298 // memory 1299 FreeHeap((void *)key); 1300 } 1301 1302 return true; 1303 } 1304 1305 //=========================================================================================================== 1306 // Setting int/mixed/comp mode flags 1307 1308 void Arguments::set_mode_flags(Mode mode) { 1309 // Set up default values for all flags. 1310 // If you add a flag to any of the branches below, 1311 // add a default value for it here. 1312 _mode = mode; 1313 1314 // Ensure Agent_OnLoad has the correct initial values. 1315 // This may not be the final mode; mode may change later in onload phase. 1316 PropertyList_unique_add(&_system_properties, "java.vm.info", 1317 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1318 1319 UseInterpreter = true; 1320 UseCompiler = true; 1321 UseLoopCounter = true; 1322 1323 // Default values may be platform/compiler dependent - 1324 // use the saved values 1325 ClipInlining = Arguments::_ClipInlining; 1326 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1327 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1328 BackgroundCompilation = Arguments::_BackgroundCompilation; 1329 1330 // Change from defaults based on mode 1331 switch (mode) { 1332 default: 1333 ShouldNotReachHere(); 1334 break; 1335 case _int: 1336 UseCompiler = false; 1337 UseLoopCounter = false; 1338 AlwaysCompileLoopMethods = false; 1339 UseOnStackReplacement = false; 1340 break; 1341 case _mixed: 1342 // same as default 1343 break; 1344 case _comp: 1345 UseInterpreter = false; 1346 BackgroundCompilation = false; 1347 ClipInlining = false; 1348 break; 1349 } 1350 } 1351 1352 // Conflict: required to use shared spaces (-Xshare:on), but 1353 // incompatible command line options were chosen. 1354 void Arguments::no_shared_spaces(const char* message) { 1355 if (RequireSharedSpaces) { 1356 jio_fprintf(defaultStream::error_stream(), 1357 "Class data sharing is inconsistent with other specified options.\n"); 1358 vm_exit_during_initialization("Unable to use shared archive", message); 1359 } else { 1360 log_info(cds)("Unable to use shared archive: %s", message); 1361 UseSharedSpaces = false; 1362 } 1363 } 1364 1365 static void set_object_alignment() { 1366 // Object alignment. 1367 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1368 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1369 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1370 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1371 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1372 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1373 1374 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1375 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1376 1377 // Oop encoding heap max 1378 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1379 } 1380 1381 size_t Arguments::max_heap_for_compressed_oops() { 1382 // Avoid sign flip. 1383 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1384 // We need to fit both the null page and the heap into the memory budget, while 1385 // keeping alignment constraints of the heap. To guarantee the latter, as the 1386 // null page is located before the heap, we pad the null page to the conservative 1387 // maximum alignment that the GC may ever impose upon the heap. 1388 size_t displacement_due_to_null_page = align_up(os::vm_page_size(), 1389 _conservative_max_heap_alignment); 1390 1391 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1392 NOT_LP64(ShouldNotReachHere(); return 0); 1393 } 1394 1395 void Arguments::set_use_compressed_oops() { 1396 #ifdef _LP64 1397 // MaxHeapSize is not set up properly at this point, but 1398 // the only value that can override MaxHeapSize if we are 1399 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1400 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1401 1402 if (max_heap_size <= max_heap_for_compressed_oops()) { 1403 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1404 FLAG_SET_ERGO(UseCompressedOops, true); 1405 } 1406 } else { 1407 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1408 warning("Max heap size too large for Compressed Oops"); 1409 FLAG_SET_DEFAULT(UseCompressedOops, false); 1410 } 1411 } 1412 #endif // _LP64 1413 } 1414 1415 void Arguments::set_use_compressed_klass_ptrs() { 1416 #ifdef _LP64 1417 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax, 1418 "CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1419 #endif // _LP64 1420 } 1421 1422 void Arguments::set_conservative_max_heap_alignment() { 1423 // The conservative maximum required alignment for the heap is the maximum of 1424 // the alignments imposed by several sources: any requirements from the heap 1425 // itself and the maximum page size we may run the VM with. 1426 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1427 _conservative_max_heap_alignment = MAX4(heap_alignment, 1428 os::vm_allocation_granularity(), 1429 os::max_page_size(), 1430 GCArguments::compute_heap_alignment()); 1431 } 1432 1433 jint Arguments::set_ergonomics_flags() { 1434 GCConfig::initialize(); 1435 1436 set_conservative_max_heap_alignment(); 1437 1438 #ifdef _LP64 1439 set_use_compressed_oops(); 1440 set_use_compressed_klass_ptrs(); 1441 1442 // Also checks that certain machines are slower with compressed oops 1443 // in vm_version initialization code. 1444 #endif // _LP64 1445 1446 return JNI_OK; 1447 } 1448 1449 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1450 size_t max_allocatable; 1451 size_t result = limit; 1452 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1453 // The AggressiveHeap check is a temporary workaround to avoid calling 1454 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1455 // selected. This works because AggressiveHeap implies UseParallelGC 1456 // where we know the ratio will be 1. Once the AggressiveHeap option is 1457 // removed, this can be cleaned up. 1458 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1459 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1460 result = MIN2(result, max_allocatable / fraction); 1461 } 1462 return result; 1463 } 1464 1465 // Use static initialization to get the default before parsing 1466 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1467 1468 void Arguments::set_heap_size() { 1469 julong phys_mem; 1470 1471 // If the user specified one of these options, they 1472 // want specific memory sizing so do not limit memory 1473 // based on compressed oops addressability. 1474 // Also, memory limits will be calculated based on 1475 // available os physical memory, not our MaxRAM limit, 1476 // unless MaxRAM is also specified. 1477 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1478 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1479 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1480 !FLAG_IS_DEFAULT(MaxRAM)); 1481 if (override_coop_limit) { 1482 if (FLAG_IS_DEFAULT(MaxRAM)) { 1483 phys_mem = os::physical_memory(); 1484 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1485 } else { 1486 phys_mem = (julong)MaxRAM; 1487 } 1488 } else { 1489 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1490 : (julong)MaxRAM; 1491 } 1492 1493 // If the maximum heap size has not been set with -Xmx, 1494 // then set it as fraction of the size of physical memory, 1495 // respecting the maximum and minimum sizes of the heap. 1496 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1497 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100); 1498 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100); 1499 if (reasonable_min < MaxHeapSize) { 1500 // Small physical memory, so use a minimum fraction of it for the heap 1501 reasonable_max = reasonable_min; 1502 } else { 1503 // Not-small physical memory, so require a heap at least 1504 // as large as MaxHeapSize 1505 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1506 } 1507 1508 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1509 // Limit the heap size to ErgoHeapSizeLimit 1510 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1511 } 1512 1513 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1514 1515 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1516 // An initial heap size was specified on the command line, 1517 // so be sure that the maximum size is consistent. Done 1518 // after call to limit_heap_by_allocatable_memory because that 1519 // method might reduce the allocation size. 1520 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1521 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1522 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1523 } 1524 1525 #ifdef _LP64 1526 if (UseCompressedOops || UseCompressedClassPointers) { 1527 // HeapBaseMinAddress can be greater than default but not less than. 1528 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1529 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1530 // matches compressed oops printing flags 1531 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1532 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1533 DefaultHeapBaseMinAddress, 1534 DefaultHeapBaseMinAddress/G, 1535 HeapBaseMinAddress); 1536 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1537 } 1538 } 1539 } 1540 if (UseCompressedOops) { 1541 // Limit the heap size to the maximum possible when using compressed oops 1542 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1543 1544 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1545 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1546 // but it should be not less than default MaxHeapSize. 1547 max_coop_heap -= HeapBaseMinAddress; 1548 } 1549 1550 // If user specified flags prioritizing os physical 1551 // memory limits, then disable compressed oops if 1552 // limits exceed max_coop_heap and UseCompressedOops 1553 // was not specified. 1554 if (reasonable_max > max_coop_heap) { 1555 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1556 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1557 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1558 "Please check the setting of MaxRAMPercentage %5.2f." 1559 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1560 FLAG_SET_ERGO(UseCompressedOops, false); 1561 } else { 1562 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1563 } 1564 } 1565 } 1566 #endif // _LP64 1567 1568 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1569 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1570 } 1571 1572 // If the minimum or initial heap_size have not been set or requested to be set 1573 // ergonomically, set them accordingly. 1574 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1575 julong reasonable_minimum = (julong)(OldSize + NewSize); 1576 1577 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1578 1579 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1580 1581 if (InitialHeapSize == 0) { 1582 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100); 1583 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1584 1585 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1586 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1587 1588 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1589 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1590 } 1591 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1592 // synchronize with InitialHeapSize to avoid errors with the default value. 1593 if (MinHeapSize == 0) { 1594 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1595 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1596 } 1597 } 1598 } 1599 1600 // This option inspects the machine and attempts to set various 1601 // parameters to be optimal for long-running, memory allocation 1602 // intensive jobs. It is intended for machines with large 1603 // amounts of cpu and memory. 1604 jint Arguments::set_aggressive_heap_flags() { 1605 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1606 // VM, but we may not be able to represent the total physical memory 1607 // available (like having 8gb of memory on a box but using a 32bit VM). 1608 // Thus, we need to make sure we're using a julong for intermediate 1609 // calculations. 1610 julong initHeapSize; 1611 julong total_memory = os::physical_memory(); 1612 1613 if (total_memory < (julong) 256 * M) { 1614 jio_fprintf(defaultStream::error_stream(), 1615 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1616 vm_exit(1); 1617 } 1618 1619 // The heap size is half of available memory, or (at most) 1620 // all of possible memory less 160mb (leaving room for the OS 1621 // when using ISM). This is the maximum; because adaptive sizing 1622 // is turned on below, the actual space used may be smaller. 1623 1624 initHeapSize = MIN2(total_memory / (julong) 2, 1625 total_memory - (julong) 160 * M); 1626 1627 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1628 1629 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1630 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1631 return JNI_EINVAL; 1632 } 1633 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1634 return JNI_EINVAL; 1635 } 1636 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1637 return JNI_EINVAL; 1638 } 1639 } 1640 if (FLAG_IS_DEFAULT(NewSize)) { 1641 // Make the young generation 3/8ths of the total heap. 1642 if (FLAG_SET_CMDLINE(NewSize, 1643 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1644 return JNI_EINVAL; 1645 } 1646 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1647 return JNI_EINVAL; 1648 } 1649 } 1650 1651 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1652 FLAG_SET_DEFAULT(UseLargePages, true); 1653 #endif 1654 1655 // Increase some data structure sizes for efficiency 1656 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1657 return JNI_EINVAL; 1658 } 1659 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1660 return JNI_EINVAL; 1661 } 1662 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1663 return JNI_EINVAL; 1664 } 1665 1666 // See the OldPLABSize comment below, but replace 'after promotion' 1667 // with 'after copying'. YoungPLABSize is the size of the survivor 1668 // space per-gc-thread buffers. The default is 4kw. 1669 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1670 return JNI_EINVAL; 1671 } 1672 1673 // OldPLABSize is the size of the buffers in the old gen that 1674 // UseParallelGC uses to promote live data that doesn't fit in the 1675 // survivor spaces. At any given time, there's one for each gc thread. 1676 // The default size is 1kw. These buffers are rarely used, since the 1677 // survivor spaces are usually big enough. For specjbb, however, there 1678 // are occasions when there's lots of live data in the young gen 1679 // and we end up promoting some of it. We don't have a definite 1680 // explanation for why bumping OldPLABSize helps, but the theory 1681 // is that a bigger PLAB results in retaining something like the 1682 // original allocation order after promotion, which improves mutator 1683 // locality. A minor effect may be that larger PLABs reduce the 1684 // number of PLAB allocation events during gc. The value of 8kw 1685 // was arrived at by experimenting with specjbb. 1686 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1687 return JNI_EINVAL; 1688 } 1689 1690 // Enable parallel GC and adaptive generation sizing 1691 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1692 return JNI_EINVAL; 1693 } 1694 1695 // Encourage steady state memory management 1696 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1697 return JNI_EINVAL; 1698 } 1699 1700 return JNI_OK; 1701 } 1702 1703 // This must be called after ergonomics. 1704 void Arguments::set_bytecode_flags() { 1705 if (!RewriteBytecodes) { 1706 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1707 } 1708 } 1709 1710 // Aggressive optimization flags 1711 jint Arguments::set_aggressive_opts_flags() { 1712 #ifdef COMPILER2 1713 if (AggressiveUnboxing) { 1714 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1715 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1716 } else if (!EliminateAutoBox) { 1717 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1718 AggressiveUnboxing = false; 1719 } 1720 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1721 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1722 } else if (!DoEscapeAnalysis) { 1723 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1724 AggressiveUnboxing = false; 1725 } 1726 } 1727 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1728 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1729 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1730 } 1731 // Feed the cache size setting into the JDK 1732 char buffer[1024]; 1733 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1734 if (!add_property(buffer)) { 1735 return JNI_ENOMEM; 1736 } 1737 } 1738 #endif 1739 1740 return JNI_OK; 1741 } 1742 1743 //=========================================================================================================== 1744 1745 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1746 if (_sun_java_launcher != _default_java_launcher) { 1747 os::free(const_cast<char*>(_sun_java_launcher)); 1748 } 1749 _sun_java_launcher = os::strdup_check_oom(launcher); 1750 } 1751 1752 bool Arguments::created_by_java_launcher() { 1753 assert(_sun_java_launcher != nullptr, "property must have value"); 1754 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1755 } 1756 1757 bool Arguments::sun_java_launcher_is_altjvm() { 1758 return _sun_java_launcher_is_altjvm; 1759 } 1760 1761 //=========================================================================================================== 1762 // Parsing of main arguments 1763 1764 unsigned int addreads_count = 0; 1765 unsigned int addexports_count = 0; 1766 unsigned int addopens_count = 0; 1767 unsigned int addmods_count = 0; 1768 unsigned int patch_mod_count = 0; 1769 unsigned int enable_native_access_count = 0; 1770 1771 // Check the consistency of vm_init_args 1772 bool Arguments::check_vm_args_consistency() { 1773 // Method for adding checks for flag consistency. 1774 // The intent is to warn the user of all possible conflicts, 1775 // before returning an error. 1776 // Note: Needs platform-dependent factoring. 1777 bool status = true; 1778 1779 if (TLABRefillWasteFraction == 0) { 1780 jio_fprintf(defaultStream::error_stream(), 1781 "TLABRefillWasteFraction should be a denominator, " 1782 "not " SIZE_FORMAT "\n", 1783 TLABRefillWasteFraction); 1784 status = false; 1785 } 1786 1787 status = CompilerConfig::check_args_consistency(status); 1788 #if INCLUDE_JVMCI 1789 if (status && EnableJVMCI) { 1790 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 1791 AddProperty, UnwriteableProperty, InternalProperty); 1792 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) { 1793 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 1794 return false; 1795 } 1796 } 1797 } 1798 #endif 1799 1800 #if INCLUDE_JFR 1801 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1802 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) { 1803 return false; 1804 } 1805 } 1806 #endif 1807 1808 #ifndef SUPPORT_RESERVED_STACK_AREA 1809 if (StackReservedPages != 0) { 1810 FLAG_SET_CMDLINE(StackReservedPages, 0); 1811 warning("Reserved Stack Area not supported on this platform"); 1812 } 1813 #endif 1814 1815 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390) 1816 if (LockingMode == LM_LIGHTWEIGHT) { 1817 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY); 1818 warning("New lightweight locking not supported on this platform"); 1819 } 1820 #endif 1821 1822 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390) 1823 if (LockingMode == LM_MONITOR) { 1824 jio_fprintf(defaultStream::error_stream(), 1825 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n"); 1826 return false; 1827 } 1828 #endif 1829 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) { 1830 jio_fprintf(defaultStream::error_stream(), 1831 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n"); 1832 return false; 1833 } 1834 return status; 1835 } 1836 1837 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1838 const char* option_type) { 1839 if (ignore) return false; 1840 1841 const char* spacer = " "; 1842 if (option_type == nullptr) { 1843 option_type = ++spacer; // Set both to the empty string. 1844 } 1845 1846 jio_fprintf(defaultStream::error_stream(), 1847 "Unrecognized %s%soption: %s\n", option_type, spacer, 1848 option->optionString); 1849 return true; 1850 } 1851 1852 static const char* user_assertion_options[] = { 1853 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1854 }; 1855 1856 static const char* system_assertion_options[] = { 1857 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1858 }; 1859 1860 bool Arguments::parse_uint(const char* value, 1861 uint* uint_arg, 1862 uint min_size) { 1863 uint n; 1864 if (!parse_integer(value, &n)) { 1865 return false; 1866 } 1867 if (n >= min_size) { 1868 *uint_arg = n; 1869 return true; 1870 } else { 1871 return false; 1872 } 1873 } 1874 1875 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 1876 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 1877 CDSConfig::check_internal_module_property(prop_name, prop_value); 1878 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 1879 char* property = AllocateHeap(prop_len, mtArguments); 1880 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 1881 if (ret < 0 || ret >= (int)prop_len) { 1882 FreeHeap(property); 1883 return false; 1884 } 1885 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 1886 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 1887 // that multiple occurrences of the associated flag just causes the existing property value to be 1888 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 1889 // to a property after we have finished flag processing. 1890 bool added = add_property(property, WriteableProperty, internal); 1891 FreeHeap(property); 1892 return added; 1893 } 1894 1895 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 1896 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 1897 CDSConfig::check_internal_module_property(prop_base_name, prop_value); 1898 const unsigned int props_count_limit = 1000; 1899 const int max_digits = 3; 1900 const int extra_symbols_count = 3; // includes '.', '=', '\0' 1901 1902 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 1903 if (count < props_count_limit) { 1904 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 1905 char* property = AllocateHeap(prop_len, mtArguments); 1906 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 1907 if (ret < 0 || ret >= (int)prop_len) { 1908 FreeHeap(property); 1909 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 1910 return false; 1911 } 1912 bool added = add_property(property, UnwriteableProperty, InternalProperty); 1913 FreeHeap(property); 1914 return added; 1915 } 1916 1917 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 1918 return false; 1919 } 1920 1921 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1922 julong* long_arg, 1923 julong min_size, 1924 julong max_size) { 1925 if (!parse_integer(s, long_arg)) return arg_unreadable; 1926 return check_memory_size(*long_arg, min_size, max_size); 1927 } 1928 1929 // Parse JavaVMInitArgs structure 1930 1931 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 1932 const JavaVMInitArgs *java_tool_options_args, 1933 const JavaVMInitArgs *java_options_args, 1934 const JavaVMInitArgs *cmd_line_args) { 1935 bool patch_mod_javabase = false; 1936 1937 // Save default settings for some mode flags 1938 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1939 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1940 Arguments::_ClipInlining = ClipInlining; 1941 Arguments::_BackgroundCompilation = BackgroundCompilation; 1942 1943 // Remember the default value of SharedBaseAddress. 1944 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 1945 1946 // Setup flags for mixed which is the default 1947 set_mode_flags(_mixed); 1948 1949 // Parse args structure generated from java.base vm options resource 1950 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE); 1951 if (result != JNI_OK) { 1952 return result; 1953 } 1954 1955 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 1956 // variable (if present). 1957 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 1958 if (result != JNI_OK) { 1959 return result; 1960 } 1961 1962 // Parse args structure generated from the command line flags. 1963 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE); 1964 if (result != JNI_OK) { 1965 return result; 1966 } 1967 1968 // Parse args structure generated from the _JAVA_OPTIONS environment 1969 // variable (if present) (mimics classic VM) 1970 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 1971 if (result != JNI_OK) { 1972 return result; 1973 } 1974 1975 // Disable CDS for exploded image 1976 if (!has_jimage()) { 1977 no_shared_spaces("CDS disabled on exploded JDK"); 1978 } 1979 1980 // We need to ensure processor and memory resources have been properly 1981 // configured - which may rely on arguments we just processed - before 1982 // doing the final argument processing. Any argument processing that 1983 // needs to know about processor and memory resources must occur after 1984 // this point. 1985 1986 os::init_container_support(); 1987 1988 SystemMemoryBarrier::initialize(); 1989 1990 // Do final processing now that all arguments have been parsed 1991 result = finalize_vm_init_args(patch_mod_javabase); 1992 if (result != JNI_OK) { 1993 return result; 1994 } 1995 1996 return JNI_OK; 1997 } 1998 1999 #if !INCLUDE_JVMTI 2000 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2001 // represents a valid JDWP agent. is_path==true denotes that we 2002 // are dealing with -agentpath (case where name is a path), otherwise with 2003 // -agentlib 2004 static bool valid_jdwp_agent(char *name, bool is_path) { 2005 char *_name; 2006 const char *_jdwp = "jdwp"; 2007 size_t _len_jdwp, _len_prefix; 2008 2009 if (is_path) { 2010 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) { 2011 return false; 2012 } 2013 2014 _name++; // skip past last path separator 2015 _len_prefix = strlen(JNI_LIB_PREFIX); 2016 2017 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2018 return false; 2019 } 2020 2021 _name += _len_prefix; 2022 _len_jdwp = strlen(_jdwp); 2023 2024 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2025 _name += _len_jdwp; 2026 } 2027 else { 2028 return false; 2029 } 2030 2031 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2032 return false; 2033 } 2034 2035 return true; 2036 } 2037 2038 if (strcmp(name, _jdwp) == 0) { 2039 return true; 2040 } 2041 2042 return false; 2043 } 2044 #endif 2045 2046 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2047 // --patch-module=<module>=<file>(<pathsep><file>)* 2048 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value"); 2049 // Find the equal sign between the module name and the path specification 2050 const char* module_equal = strchr(patch_mod_tail, '='); 2051 if (module_equal == nullptr) { 2052 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2053 return JNI_ERR; 2054 } else { 2055 // Pick out the module name 2056 size_t module_len = module_equal - patch_mod_tail; 2057 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2058 if (module_name != nullptr) { 2059 memcpy(module_name, patch_mod_tail, module_len); 2060 *(module_name + module_len) = '\0'; 2061 // The path piece begins one past the module_equal sign 2062 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2063 FREE_C_HEAP_ARRAY(char, module_name); 2064 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2065 return JNI_ENOMEM; 2066 } 2067 } else { 2068 return JNI_ENOMEM; 2069 } 2070 } 2071 return JNI_OK; 2072 } 2073 2074 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2075 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2076 // The min and max sizes match the values in globals.hpp, but scaled 2077 // with K. The values have been chosen so that alignment with page 2078 // size doesn't change the max value, which makes the conversions 2079 // back and forth between Xss value and ThreadStackSize value easier. 2080 // The values have also been chosen to fit inside a 32-bit signed type. 2081 const julong min_ThreadStackSize = 0; 2082 const julong max_ThreadStackSize = 1 * M; 2083 2084 // Make sure the above values match the range set in globals.hpp 2085 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2086 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2087 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2088 2089 const julong min_size = min_ThreadStackSize * K; 2090 const julong max_size = max_ThreadStackSize * K; 2091 2092 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2093 2094 julong size = 0; 2095 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2096 if (errcode != arg_in_range) { 2097 bool silent = (option == nullptr); // Allow testing to silence error messages 2098 if (!silent) { 2099 jio_fprintf(defaultStream::error_stream(), 2100 "Invalid thread stack size: %s\n", option->optionString); 2101 describe_range_error(errcode); 2102 } 2103 return JNI_EINVAL; 2104 } 2105 2106 // Internally track ThreadStackSize in units of 1024 bytes. 2107 const julong size_aligned = align_up(size, K); 2108 assert(size <= size_aligned, 2109 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2110 size, size_aligned); 2111 2112 const julong size_in_K = size_aligned / K; 2113 assert(size_in_K < (julong)max_intx, 2114 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2115 size_in_K); 2116 2117 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2118 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2119 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2120 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2121 max_expanded, size_in_K); 2122 2123 *out_ThreadStackSize = (intx)size_in_K; 2124 2125 return JNI_OK; 2126 } 2127 2128 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) { 2129 // For match_option to return remaining or value part of option string 2130 const char* tail; 2131 2132 // iterate over arguments 2133 for (int index = 0; index < args->nOptions; index++) { 2134 bool is_absolute_path = false; // for -agentpath vs -agentlib 2135 2136 const JavaVMOption* option = args->options + index; 2137 2138 if (!match_option(option, "-Djava.class.path", &tail) && 2139 !match_option(option, "-Dsun.java.command", &tail) && 2140 !match_option(option, "-Dsun.java.launcher", &tail)) { 2141 2142 // add all jvm options to the jvm_args string. This string 2143 // is used later to set the java.vm.args PerfData string constant. 2144 // the -Djava.class.path and the -Dsun.java.command options are 2145 // omitted from jvm_args string as each have their own PerfData 2146 // string constant object. 2147 build_jvm_args(option->optionString); 2148 } 2149 2150 // -verbose:[class/module/gc/jni] 2151 if (match_option(option, "-verbose", &tail)) { 2152 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2153 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2154 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2155 } else if (!strcmp(tail, ":module")) { 2156 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2157 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2158 } else if (!strcmp(tail, ":gc")) { 2159 if (_legacyGCLogging.lastFlag == 0) { 2160 _legacyGCLogging.lastFlag = 1; 2161 } 2162 } else if (!strcmp(tail, ":jni")) { 2163 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2164 } 2165 // -da / -ea / -disableassertions / -enableassertions 2166 // These accept an optional class/package name separated by a colon, e.g., 2167 // -da:java.lang.Thread. 2168 } else if (match_option(option, user_assertion_options, &tail, true)) { 2169 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2170 if (*tail == '\0') { 2171 JavaAssertions::setUserClassDefault(enable); 2172 } else { 2173 assert(*tail == ':', "bogus match by match_option()"); 2174 JavaAssertions::addOption(tail + 1, enable); 2175 } 2176 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2177 } else if (match_option(option, system_assertion_options, &tail, false)) { 2178 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2179 JavaAssertions::setSystemClassDefault(enable); 2180 // -bootclasspath: 2181 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2182 jio_fprintf(defaultStream::output_stream(), 2183 "-Xbootclasspath is no longer a supported option.\n"); 2184 return JNI_EINVAL; 2185 // -bootclasspath/a: 2186 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2187 Arguments::append_sysclasspath(tail); 2188 // -bootclasspath/p: 2189 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2190 jio_fprintf(defaultStream::output_stream(), 2191 "-Xbootclasspath/p is no longer a supported option.\n"); 2192 return JNI_EINVAL; 2193 // -Xrun 2194 } else if (match_option(option, "-Xrun", &tail)) { 2195 if (tail != nullptr) { 2196 const char* pos = strchr(tail, ':'); 2197 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail; 2198 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2199 jio_snprintf(name, len + 1, "%s", tail); 2200 2201 char *options = nullptr; 2202 if(pos != nullptr) { 2203 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2204 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2205 } 2206 #if !INCLUDE_JVMTI 2207 if (strcmp(name, "jdwp") == 0) { 2208 jio_fprintf(defaultStream::error_stream(), 2209 "Debugging agents are not supported in this VM\n"); 2210 return JNI_ERR; 2211 } 2212 #endif // !INCLUDE_JVMTI 2213 JvmtiAgentList::add_xrun(name, options, false); 2214 FREE_C_HEAP_ARRAY(char, name); 2215 FREE_C_HEAP_ARRAY(char, options); 2216 } 2217 } else if (match_option(option, "--add-reads=", &tail)) { 2218 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2219 return JNI_ENOMEM; 2220 } 2221 } else if (match_option(option, "--add-exports=", &tail)) { 2222 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2223 return JNI_ENOMEM; 2224 } 2225 } else if (match_option(option, "--add-opens=", &tail)) { 2226 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2227 return JNI_ENOMEM; 2228 } 2229 } else if (match_option(option, "--add-modules=", &tail)) { 2230 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2231 return JNI_ENOMEM; 2232 } 2233 } else if (match_option(option, "--enable-native-access=", &tail)) { 2234 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2235 return JNI_ENOMEM; 2236 } 2237 } else if (match_option(option, "--limit-modules=", &tail)) { 2238 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2239 return JNI_ENOMEM; 2240 } 2241 } else if (match_option(option, "--module-path=", &tail)) { 2242 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2243 return JNI_ENOMEM; 2244 } 2245 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2246 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2247 return JNI_ENOMEM; 2248 } 2249 } else if (match_option(option, "--patch-module=", &tail)) { 2250 // --patch-module=<module>=<file>(<pathsep><file>)* 2251 int res = process_patch_mod_option(tail, patch_mod_javabase); 2252 if (res != JNI_OK) { 2253 return res; 2254 } 2255 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) { 2256 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) { 2257 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail, 2258 AddProperty, WriteableProperty, InternalProperty); 2259 } else { 2260 jio_fprintf(defaultStream::error_stream(), 2261 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail); 2262 return JNI_ERR; 2263 } 2264 } else if (match_option(option, "--illegal-access=", &tail)) { 2265 char version[256]; 2266 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2267 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2268 // -agentlib and -agentpath 2269 } else if (match_option(option, "-agentlib:", &tail) || 2270 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2271 if(tail != nullptr) { 2272 const char* pos = strchr(tail, '='); 2273 char* name; 2274 if (pos == nullptr) { 2275 name = os::strdup_check_oom(tail, mtArguments); 2276 } else { 2277 size_t len = pos - tail; 2278 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2279 memcpy(name, tail, len); 2280 name[len] = '\0'; 2281 } 2282 2283 char *options = nullptr; 2284 if(pos != nullptr) { 2285 options = os::strdup_check_oom(pos + 1, mtArguments); 2286 } 2287 #if !INCLUDE_JVMTI 2288 if (valid_jdwp_agent(name, is_absolute_path)) { 2289 jio_fprintf(defaultStream::error_stream(), 2290 "Debugging agents are not supported in this VM\n"); 2291 return JNI_ERR; 2292 } 2293 #endif // !INCLUDE_JVMTI 2294 JvmtiAgentList::add(name, options, is_absolute_path); 2295 os::free(name); 2296 os::free(options); 2297 } 2298 // -javaagent 2299 } else if (match_option(option, "-javaagent:", &tail)) { 2300 #if !INCLUDE_JVMTI 2301 jio_fprintf(defaultStream::error_stream(), 2302 "Instrumentation agents are not supported in this VM\n"); 2303 return JNI_ERR; 2304 #else 2305 if (tail != nullptr) { 2306 size_t length = strlen(tail) + 1; 2307 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2308 jio_snprintf(options, length, "%s", tail); 2309 JvmtiAgentList::add("instrument", options, false); 2310 FREE_C_HEAP_ARRAY(char, options); 2311 2312 // java agents need module java.instrument 2313 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2314 return JNI_ENOMEM; 2315 } 2316 } 2317 #endif // !INCLUDE_JVMTI 2318 // --enable_preview 2319 } else if (match_option(option, "--enable-preview")) { 2320 set_enable_preview(); 2321 // -Xnoclassgc 2322 } else if (match_option(option, "-Xnoclassgc")) { 2323 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2324 return JNI_EINVAL; 2325 } 2326 // -Xbatch 2327 } else if (match_option(option, "-Xbatch")) { 2328 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2329 return JNI_EINVAL; 2330 } 2331 // -Xmn for compatibility with other JVM vendors 2332 } else if (match_option(option, "-Xmn", &tail)) { 2333 julong long_initial_young_size = 0; 2334 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2335 if (errcode != arg_in_range) { 2336 jio_fprintf(defaultStream::error_stream(), 2337 "Invalid initial young generation size: %s\n", option->optionString); 2338 describe_range_error(errcode); 2339 return JNI_EINVAL; 2340 } 2341 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2342 return JNI_EINVAL; 2343 } 2344 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2345 return JNI_EINVAL; 2346 } 2347 // -Xms 2348 } else if (match_option(option, "-Xms", &tail)) { 2349 julong size = 0; 2350 // an initial heap size of 0 means automatically determine 2351 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2352 if (errcode != arg_in_range) { 2353 jio_fprintf(defaultStream::error_stream(), 2354 "Invalid initial heap size: %s\n", option->optionString); 2355 describe_range_error(errcode); 2356 return JNI_EINVAL; 2357 } 2358 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2359 return JNI_EINVAL; 2360 } 2361 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2362 return JNI_EINVAL; 2363 } 2364 // -Xmx 2365 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2366 julong long_max_heap_size = 0; 2367 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2368 if (errcode != arg_in_range) { 2369 jio_fprintf(defaultStream::error_stream(), 2370 "Invalid maximum heap size: %s\n", option->optionString); 2371 describe_range_error(errcode); 2372 return JNI_EINVAL; 2373 } 2374 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2375 return JNI_EINVAL; 2376 } 2377 // Xmaxf 2378 } else if (match_option(option, "-Xmaxf", &tail)) { 2379 char* err; 2380 int maxf = (int)(strtod(tail, &err) * 100); 2381 if (*err != '\0' || *tail == '\0') { 2382 jio_fprintf(defaultStream::error_stream(), 2383 "Bad max heap free percentage size: %s\n", 2384 option->optionString); 2385 return JNI_EINVAL; 2386 } else { 2387 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2388 return JNI_EINVAL; 2389 } 2390 } 2391 // Xminf 2392 } else if (match_option(option, "-Xminf", &tail)) { 2393 char* err; 2394 int minf = (int)(strtod(tail, &err) * 100); 2395 if (*err != '\0' || *tail == '\0') { 2396 jio_fprintf(defaultStream::error_stream(), 2397 "Bad min heap free percentage size: %s\n", 2398 option->optionString); 2399 return JNI_EINVAL; 2400 } else { 2401 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2402 return JNI_EINVAL; 2403 } 2404 } 2405 // -Xss 2406 } else if (match_option(option, "-Xss", &tail)) { 2407 intx value = 0; 2408 jint err = parse_xss(option, tail, &value); 2409 if (err != JNI_OK) { 2410 return err; 2411 } 2412 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2413 return JNI_EINVAL; 2414 } 2415 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2416 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2417 julong long_ReservedCodeCacheSize = 0; 2418 2419 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2420 if (errcode != arg_in_range) { 2421 jio_fprintf(defaultStream::error_stream(), 2422 "Invalid maximum code cache size: %s.\n", option->optionString); 2423 return JNI_EINVAL; 2424 } 2425 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2426 return JNI_EINVAL; 2427 } 2428 // -green 2429 } else if (match_option(option, "-green")) { 2430 jio_fprintf(defaultStream::error_stream(), 2431 "Green threads support not available\n"); 2432 return JNI_EINVAL; 2433 // -native 2434 } else if (match_option(option, "-native")) { 2435 // HotSpot always uses native threads, ignore silently for compatibility 2436 // -Xrs 2437 } else if (match_option(option, "-Xrs")) { 2438 // Classic/EVM option, new functionality 2439 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2440 return JNI_EINVAL; 2441 } 2442 // -Xprof 2443 } else if (match_option(option, "-Xprof")) { 2444 char version[256]; 2445 // Obsolete in JDK 10 2446 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2447 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2448 // -Xinternalversion 2449 } else if (match_option(option, "-Xinternalversion")) { 2450 jio_fprintf(defaultStream::output_stream(), "%s\n", 2451 VM_Version::internal_vm_info_string()); 2452 vm_exit(0); 2453 #ifndef PRODUCT 2454 // -Xprintflags 2455 } else if (match_option(option, "-Xprintflags")) { 2456 JVMFlag::printFlags(tty, false); 2457 vm_exit(0); 2458 #endif 2459 // -D 2460 } else if (match_option(option, "-D", &tail)) { 2461 const char* value; 2462 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2463 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2464 // abort if -Djava.endorsed.dirs is set 2465 jio_fprintf(defaultStream::output_stream(), 2466 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2467 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2468 return JNI_EINVAL; 2469 } 2470 if (match_option(option, "-Djava.ext.dirs=", &value) && 2471 *value != '\0' && strcmp(value, "\"\"") != 0) { 2472 // abort if -Djava.ext.dirs is set 2473 jio_fprintf(defaultStream::output_stream(), 2474 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2475 return JNI_EINVAL; 2476 } 2477 // Check for module related properties. They must be set using the modules 2478 // options. For example: use "--add-modules=java.sql", not 2479 // "-Djdk.module.addmods=java.sql" 2480 if (is_internal_module_property(option->optionString + 2)) { 2481 needs_module_property_warning = true; 2482 continue; 2483 } 2484 if (!add_property(tail)) { 2485 return JNI_ENOMEM; 2486 } 2487 // Out of the box management support 2488 if (match_option(option, "-Dcom.sun.management", &tail)) { 2489 #if INCLUDE_MANAGEMENT 2490 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2491 return JNI_EINVAL; 2492 } 2493 // management agent in module jdk.management.agent 2494 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2495 return JNI_ENOMEM; 2496 } 2497 #else 2498 jio_fprintf(defaultStream::output_stream(), 2499 "-Dcom.sun.management is not supported in this VM.\n"); 2500 return JNI_ERR; 2501 #endif 2502 } 2503 // -Xint 2504 } else if (match_option(option, "-Xint")) { 2505 set_mode_flags(_int); 2506 mode_flag_cmd_line = true; 2507 // -Xmixed 2508 } else if (match_option(option, "-Xmixed")) { 2509 set_mode_flags(_mixed); 2510 mode_flag_cmd_line = true; 2511 // -Xcomp 2512 } else if (match_option(option, "-Xcomp")) { 2513 // for testing the compiler; turn off all flags that inhibit compilation 2514 set_mode_flags(_comp); 2515 mode_flag_cmd_line = true; 2516 // -Xshare:dump 2517 } else if (match_option(option, "-Xshare:dump")) { 2518 CDSConfig::enable_dumping_static_archive(); 2519 // -Xshare:on 2520 } else if (match_option(option, "-Xshare:on")) { 2521 UseSharedSpaces = true; 2522 RequireSharedSpaces = true; 2523 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2524 } else if (match_option(option, "-Xshare:auto")) { 2525 UseSharedSpaces = true; 2526 RequireSharedSpaces = false; 2527 xshare_auto_cmd_line = true; 2528 // -Xshare:off 2529 } else if (match_option(option, "-Xshare:off")) { 2530 UseSharedSpaces = false; 2531 RequireSharedSpaces = false; 2532 // -Xverify 2533 } else if (match_option(option, "-Xverify", &tail)) { 2534 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2535 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2536 return JNI_EINVAL; 2537 } 2538 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2539 return JNI_EINVAL; 2540 } 2541 } else if (strcmp(tail, ":remote") == 0) { 2542 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2543 return JNI_EINVAL; 2544 } 2545 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2546 return JNI_EINVAL; 2547 } 2548 } else if (strcmp(tail, ":none") == 0) { 2549 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2550 return JNI_EINVAL; 2551 } 2552 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2553 return JNI_EINVAL; 2554 } 2555 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2556 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2557 return JNI_EINVAL; 2558 } 2559 // -Xdebug 2560 } else if (match_option(option, "-Xdebug")) { 2561 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release."); 2562 } else if (match_option(option, "-Xloggc:", &tail)) { 2563 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2564 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2565 _legacyGCLogging.lastFlag = 2; 2566 _legacyGCLogging.file = os::strdup_check_oom(tail); 2567 } else if (match_option(option, "-Xlog", &tail)) { 2568 bool ret = false; 2569 if (strcmp(tail, ":help") == 0) { 2570 fileStream stream(defaultStream::output_stream()); 2571 LogConfiguration::print_command_line_help(&stream); 2572 vm_exit(0); 2573 } else if (strcmp(tail, ":disable") == 0) { 2574 LogConfiguration::disable_logging(); 2575 ret = true; 2576 } else if (strcmp(tail, ":async") == 0) { 2577 LogConfiguration::set_async_mode(true); 2578 ret = true; 2579 } else if (*tail == '\0') { 2580 ret = LogConfiguration::parse_command_line_arguments(); 2581 assert(ret, "-Xlog without arguments should never fail to parse"); 2582 } else if (*tail == ':') { 2583 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2584 } 2585 if (ret == false) { 2586 jio_fprintf(defaultStream::error_stream(), 2587 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2588 tail); 2589 return JNI_EINVAL; 2590 } 2591 // JNI hooks 2592 } else if (match_option(option, "-Xcheck", &tail)) { 2593 if (!strcmp(tail, ":jni")) { 2594 #if !INCLUDE_JNI_CHECK 2595 warning("JNI CHECKING is not supported in this VM"); 2596 #else 2597 CheckJNICalls = true; 2598 #endif // INCLUDE_JNI_CHECK 2599 } else if (is_bad_option(option, args->ignoreUnrecognized, 2600 "check")) { 2601 return JNI_EINVAL; 2602 } 2603 } else if (match_option(option, "vfprintf")) { 2604 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2605 } else if (match_option(option, "exit")) { 2606 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2607 } else if (match_option(option, "abort")) { 2608 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2609 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2610 // and the last option wins. 2611 } else if (match_option(option, "-XX:+NeverTenure")) { 2612 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2613 return JNI_EINVAL; 2614 } 2615 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2616 return JNI_EINVAL; 2617 } 2618 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2619 return JNI_EINVAL; 2620 } 2621 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2622 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2623 return JNI_EINVAL; 2624 } 2625 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2626 return JNI_EINVAL; 2627 } 2628 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2629 return JNI_EINVAL; 2630 } 2631 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2632 uint max_tenuring_thresh = 0; 2633 if (!parse_uint(tail, &max_tenuring_thresh, 0)) { 2634 jio_fprintf(defaultStream::error_stream(), 2635 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2636 return JNI_EINVAL; 2637 } 2638 2639 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2640 return JNI_EINVAL; 2641 } 2642 2643 if (MaxTenuringThreshold == 0) { 2644 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2645 return JNI_EINVAL; 2646 } 2647 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2648 return JNI_EINVAL; 2649 } 2650 } else { 2651 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2652 return JNI_EINVAL; 2653 } 2654 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2655 return JNI_EINVAL; 2656 } 2657 } 2658 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2659 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2660 return JNI_EINVAL; 2661 } 2662 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2663 return JNI_EINVAL; 2664 } 2665 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2666 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2667 return JNI_EINVAL; 2668 } 2669 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2670 return JNI_EINVAL; 2671 } 2672 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2673 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2674 return JNI_EINVAL; 2675 } 2676 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2677 return JNI_EINVAL; 2678 } 2679 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2680 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2681 return JNI_EINVAL; 2682 } 2683 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2684 return JNI_EINVAL; 2685 } 2686 } else if (match_option(option, "--finalization=", &tail)) { 2687 if (strcmp(tail, "enabled") == 0) { 2688 InstanceKlass::set_finalization_enabled(true); 2689 } else if (strcmp(tail, "disabled") == 0) { 2690 InstanceKlass::set_finalization_enabled(false); 2691 } else { 2692 jio_fprintf(defaultStream::error_stream(), 2693 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2694 tail); 2695 return JNI_EINVAL; 2696 } 2697 #if !defined(DTRACE_ENABLED) 2698 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2699 jio_fprintf(defaultStream::error_stream(), 2700 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2701 return JNI_EINVAL; 2702 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2703 jio_fprintf(defaultStream::error_stream(), 2704 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2705 return JNI_EINVAL; 2706 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2707 jio_fprintf(defaultStream::error_stream(), 2708 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2709 return JNI_EINVAL; 2710 #endif // !defined(DTRACE_ENABLED) 2711 #ifdef ASSERT 2712 } else if (match_option(option, "-XX:+FullGCALot")) { 2713 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2714 return JNI_EINVAL; 2715 } 2716 #endif 2717 #if !INCLUDE_MANAGEMENT 2718 } else if (match_option(option, "-XX:+ManagementServer")) { 2719 jio_fprintf(defaultStream::error_stream(), 2720 "ManagementServer is not supported in this VM.\n"); 2721 return JNI_ERR; 2722 #endif // INCLUDE_MANAGEMENT 2723 #if INCLUDE_JVMCI 2724 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) { 2725 if (EnableJVMCIProduct) { 2726 jio_fprintf(defaultStream::error_stream(), 2727 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n"); 2728 return JNI_EINVAL; 2729 } 2730 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) { 2731 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT"); 2732 if (use_graal_jit) { 2733 const char* jvmci_compiler = get_property("jvmci.Compiler"); 2734 if (jvmci_compiler != nullptr) { 2735 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) { 2736 jio_fprintf(defaultStream::error_stream(), 2737 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler); 2738 return JNI_ERR; 2739 } 2740 } else if (!add_property("jvmci.Compiler=graal")) { 2741 return JNI_ENOMEM; 2742 } 2743 } 2744 2745 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before 2746 if (EnableJVMCIProduct) { 2747 continue; 2748 } 2749 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2750 // Allow this flag if it has been unlocked. 2751 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) { 2752 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) { 2753 jio_fprintf(defaultStream::error_stream(), 2754 "Unable to enable JVMCI in product mode\n"); 2755 return JNI_ERR; 2756 } 2757 } 2758 // The flag was locked so process normally to report that error 2759 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2760 return JNI_EINVAL; 2761 } 2762 #endif // INCLUDE_JVMCI 2763 #if INCLUDE_JFR 2764 } else if (match_jfr_option(&option)) { 2765 return JNI_EINVAL; 2766 #endif 2767 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2768 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2769 // already been handled 2770 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2771 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2772 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2773 return JNI_EINVAL; 2774 } 2775 } 2776 // Unknown option 2777 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2778 return JNI_ERR; 2779 } 2780 } 2781 2782 // PrintSharedArchiveAndExit will turn on 2783 // -Xshare:on 2784 // -Xlog:class+path=info 2785 if (PrintSharedArchiveAndExit) { 2786 UseSharedSpaces = true; 2787 RequireSharedSpaces = true; 2788 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2789 } 2790 2791 fix_appclasspath(); 2792 2793 return JNI_OK; 2794 } 2795 2796 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 2797 // For java.base check for duplicate --patch-module options being specified on the command line. 2798 // This check is only required for java.base, all other duplicate module specifications 2799 // will be checked during module system initialization. The module system initialization 2800 // will throw an ExceptionInInitializerError if this situation occurs. 2801 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2802 if (*patch_mod_javabase) { 2803 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2804 } else { 2805 *patch_mod_javabase = true; 2806 } 2807 } 2808 2809 // Create GrowableArray lazily, only if --patch-module has been specified 2810 if (_patch_mod_prefix == nullptr) { 2811 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2812 } 2813 2814 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2815 } 2816 2817 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2818 // 2819 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2820 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2821 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2822 // path is treated as the current directory. 2823 // 2824 // This causes problems with CDS, which requires that all directories specified in the classpath 2825 // must be empty. In most cases, applications do NOT want to load classes from the current 2826 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2827 // scripts compatible with CDS. 2828 void Arguments::fix_appclasspath() { 2829 if (IgnoreEmptyClassPaths) { 2830 const char separator = *os::path_separator(); 2831 const char* src = _java_class_path->value(); 2832 2833 // skip over all the leading empty paths 2834 while (*src == separator) { 2835 src ++; 2836 } 2837 2838 char* copy = os::strdup_check_oom(src, mtArguments); 2839 2840 // trim all trailing empty paths 2841 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 2842 *tail = '\0'; 2843 } 2844 2845 char from[3] = {separator, separator, '\0'}; 2846 char to [2] = {separator, '\0'}; 2847 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 2848 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 2849 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 2850 } 2851 2852 _java_class_path->set_writeable_value(copy); 2853 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 2854 } 2855 } 2856 2857 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 2858 // check if the default lib/endorsed directory exists; if so, error 2859 char path[JVM_MAXPATHLEN]; 2860 const char* fileSep = os::file_separator(); 2861 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 2862 2863 DIR* dir = os::opendir(path); 2864 if (dir != nullptr) { 2865 jio_fprintf(defaultStream::output_stream(), 2866 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 2867 "in modular form will be supported via the concept of upgradeable modules.\n"); 2868 os::closedir(dir); 2869 return JNI_ERR; 2870 } 2871 2872 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 2873 dir = os::opendir(path); 2874 if (dir != nullptr) { 2875 jio_fprintf(defaultStream::output_stream(), 2876 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 2877 "Use -classpath instead.\n."); 2878 os::closedir(dir); 2879 return JNI_ERR; 2880 } 2881 2882 // This must be done after all arguments have been processed 2883 // and the container support has been initialized since AggressiveHeap 2884 // relies on the amount of total memory available. 2885 if (AggressiveHeap) { 2886 jint result = set_aggressive_heap_flags(); 2887 if (result != JNI_OK) { 2888 return result; 2889 } 2890 } 2891 2892 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 2893 // but like -Xint, leave compilation thresholds unaffected. 2894 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 2895 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 2896 set_mode_flags(_int); 2897 } 2898 2899 #ifdef ZERO 2900 // Zero always runs in interpreted mode 2901 set_mode_flags(_int); 2902 #endif 2903 2904 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 2905 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 2906 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 2907 } 2908 2909 #if !COMPILER2_OR_JVMCI 2910 // Don't degrade server performance for footprint 2911 if (FLAG_IS_DEFAULT(UseLargePages) && 2912 MaxHeapSize < LargePageHeapSizeThreshold) { 2913 // No need for large granularity pages w/small heaps. 2914 // Note that large pages are enabled/disabled for both the 2915 // Java heap and the code cache. 2916 FLAG_SET_DEFAULT(UseLargePages, false); 2917 } 2918 2919 UNSUPPORTED_OPTION(ProfileInterpreter); 2920 #endif 2921 2922 // Parse the CompilationMode flag 2923 if (!CompilationModeFlag::initialize()) { 2924 return JNI_ERR; 2925 } 2926 2927 if (!check_vm_args_consistency()) { 2928 return JNI_ERR; 2929 } 2930 2931 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line)) { 2932 return JNI_ERR; 2933 } 2934 2935 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 2936 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 2937 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 2938 2939 return JNI_OK; 2940 } 2941 2942 // Helper class for controlling the lifetime of JavaVMInitArgs 2943 // objects. The contents of the JavaVMInitArgs are guaranteed to be 2944 // deleted on the destruction of the ScopedVMInitArgs object. 2945 class ScopedVMInitArgs : public StackObj { 2946 private: 2947 JavaVMInitArgs _args; 2948 char* _container_name; 2949 bool _is_set; 2950 char* _vm_options_file_arg; 2951 2952 public: 2953 ScopedVMInitArgs(const char *container_name) { 2954 _args.version = JNI_VERSION_1_2; 2955 _args.nOptions = 0; 2956 _args.options = nullptr; 2957 _args.ignoreUnrecognized = false; 2958 _container_name = (char *)container_name; 2959 _is_set = false; 2960 _vm_options_file_arg = nullptr; 2961 } 2962 2963 // Populates the JavaVMInitArgs object represented by this 2964 // ScopedVMInitArgs object with the arguments in options. The 2965 // allocated memory is deleted by the destructor. If this method 2966 // returns anything other than JNI_OK, then this object is in a 2967 // partially constructed state, and should be abandoned. 2968 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 2969 _is_set = true; 2970 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 2971 JavaVMOption, options->length(), mtArguments); 2972 if (options_arr == nullptr) { 2973 return JNI_ENOMEM; 2974 } 2975 _args.options = options_arr; 2976 2977 for (int i = 0; i < options->length(); i++) { 2978 options_arr[i] = options->at(i); 2979 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 2980 if (options_arr[i].optionString == nullptr) { 2981 // Rely on the destructor to do cleanup. 2982 _args.nOptions = i; 2983 return JNI_ENOMEM; 2984 } 2985 } 2986 2987 _args.nOptions = options->length(); 2988 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 2989 return JNI_OK; 2990 } 2991 2992 JavaVMInitArgs* get() { return &_args; } 2993 char* container_name() { return _container_name; } 2994 bool is_set() { return _is_set; } 2995 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; } 2996 char* vm_options_file_arg() { return _vm_options_file_arg; } 2997 2998 void set_vm_options_file_arg(const char *vm_options_file_arg) { 2999 if (_vm_options_file_arg != nullptr) { 3000 os::free(_vm_options_file_arg); 3001 } 3002 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3003 } 3004 3005 ~ScopedVMInitArgs() { 3006 if (_vm_options_file_arg != nullptr) { 3007 os::free(_vm_options_file_arg); 3008 } 3009 if (_args.options == nullptr) return; 3010 for (int i = 0; i < _args.nOptions; i++) { 3011 os::free(_args.options[i].optionString); 3012 } 3013 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3014 } 3015 3016 // Insert options into this option list, to replace option at 3017 // vm_options_file_pos (-XX:VMOptionsFile) 3018 jint insert(const JavaVMInitArgs* args, 3019 const JavaVMInitArgs* args_to_insert, 3020 const int vm_options_file_pos) { 3021 assert(_args.options == nullptr, "shouldn't be set yet"); 3022 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3023 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3024 3025 int length = args->nOptions + args_to_insert->nOptions - 1; 3026 // Construct new option array 3027 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3028 for (int i = 0; i < args->nOptions; i++) { 3029 if (i == vm_options_file_pos) { 3030 // insert the new options starting at the same place as the 3031 // -XX:VMOptionsFile option 3032 for (int j = 0; j < args_to_insert->nOptions; j++) { 3033 options.push(args_to_insert->options[j]); 3034 } 3035 } else { 3036 options.push(args->options[i]); 3037 } 3038 } 3039 // make into options array 3040 return set_args(&options); 3041 } 3042 }; 3043 3044 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3045 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3046 } 3047 3048 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3049 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3050 } 3051 3052 jint Arguments::parse_options_environment_variable(const char* name, 3053 ScopedVMInitArgs* vm_args) { 3054 char *buffer = ::getenv(name); 3055 3056 // Don't check this environment variable if user has special privileges 3057 // (e.g. unix su command). 3058 if (buffer == nullptr || os::have_special_privileges()) { 3059 return JNI_OK; 3060 } 3061 3062 if ((buffer = os::strdup(buffer)) == nullptr) { 3063 return JNI_ENOMEM; 3064 } 3065 3066 jio_fprintf(defaultStream::error_stream(), 3067 "Picked up %s: %s\n", name, buffer); 3068 3069 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3070 3071 os::free(buffer); 3072 return retcode; 3073 } 3074 3075 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3076 // read file into buffer 3077 int fd = ::open(file_name, O_RDONLY); 3078 if (fd < 0) { 3079 jio_fprintf(defaultStream::error_stream(), 3080 "Could not open options file '%s'\n", 3081 file_name); 3082 return JNI_ERR; 3083 } 3084 3085 struct stat stbuf; 3086 int retcode = os::stat(file_name, &stbuf); 3087 if (retcode != 0) { 3088 jio_fprintf(defaultStream::error_stream(), 3089 "Could not stat options file '%s'\n", 3090 file_name); 3091 ::close(fd); 3092 return JNI_ERR; 3093 } 3094 3095 if (stbuf.st_size == 0) { 3096 // tell caller there is no option data and that is ok 3097 ::close(fd); 3098 return JNI_OK; 3099 } 3100 3101 // '+ 1' for null termination even with max bytes 3102 size_t bytes_alloc = stbuf.st_size + 1; 3103 3104 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3105 if (nullptr == buf) { 3106 jio_fprintf(defaultStream::error_stream(), 3107 "Could not allocate read buffer for options file parse\n"); 3108 ::close(fd); 3109 return JNI_ENOMEM; 3110 } 3111 3112 memset(buf, 0, bytes_alloc); 3113 3114 // Fill buffer 3115 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3116 ::close(fd); 3117 if (bytes_read < 0) { 3118 FREE_C_HEAP_ARRAY(char, buf); 3119 jio_fprintf(defaultStream::error_stream(), 3120 "Could not read options file '%s'\n", file_name); 3121 return JNI_ERR; 3122 } 3123 3124 if (bytes_read == 0) { 3125 // tell caller there is no option data and that is ok 3126 FREE_C_HEAP_ARRAY(char, buf); 3127 return JNI_OK; 3128 } 3129 3130 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3131 3132 FREE_C_HEAP_ARRAY(char, buf); 3133 return retcode; 3134 } 3135 3136 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3137 // Construct option array 3138 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3139 3140 // some pointers to help with parsing 3141 char *buffer_end = buffer + buf_len; 3142 char *opt_hd = buffer; 3143 char *wrt = buffer; 3144 char *rd = buffer; 3145 3146 // parse all options 3147 while (rd < buffer_end) { 3148 // skip leading white space from the input string 3149 while (rd < buffer_end && isspace((unsigned char) *rd)) { 3150 rd++; 3151 } 3152 3153 if (rd >= buffer_end) { 3154 break; 3155 } 3156 3157 // Remember this is where we found the head of the token. 3158 opt_hd = wrt; 3159 3160 // Tokens are strings of non white space characters separated 3161 // by one or more white spaces. 3162 while (rd < buffer_end && !isspace((unsigned char) *rd)) { 3163 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3164 int quote = *rd; // matching quote to look for 3165 rd++; // don't copy open quote 3166 while (rd < buffer_end && *rd != quote) { 3167 // include everything (even spaces) 3168 // up until the close quote 3169 *wrt++ = *rd++; // copy to option string 3170 } 3171 3172 if (rd < buffer_end) { 3173 rd++; // don't copy close quote 3174 } else { 3175 // did not see closing quote 3176 jio_fprintf(defaultStream::error_stream(), 3177 "Unmatched quote in %s\n", name); 3178 return JNI_ERR; 3179 } 3180 } else { 3181 *wrt++ = *rd++; // copy to option string 3182 } 3183 } 3184 3185 // steal a white space character and set it to null 3186 *wrt++ = '\0'; 3187 // We now have a complete token 3188 3189 JavaVMOption option; 3190 option.optionString = opt_hd; 3191 option.extraInfo = nullptr; 3192 3193 options.append(option); // Fill in option 3194 3195 rd++; // Advance to next character 3196 } 3197 3198 // Fill out JavaVMInitArgs structure. 3199 return vm_args->set_args(&options); 3200 } 3201 3202 #ifndef PRODUCT 3203 // Determine whether LogVMOutput should be implicitly turned on. 3204 static bool use_vm_log() { 3205 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3206 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3207 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3208 PrintAssembly || TraceDeoptimization || 3209 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3210 return true; 3211 } 3212 3213 #ifdef COMPILER1 3214 if (PrintC1Statistics) { 3215 return true; 3216 } 3217 #endif // COMPILER1 3218 3219 #ifdef COMPILER2 3220 if (PrintOptoAssembly || PrintOptoStatistics) { 3221 return true; 3222 } 3223 #endif // COMPILER2 3224 3225 return false; 3226 } 3227 3228 #endif // PRODUCT 3229 3230 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3231 for (int index = 0; index < args->nOptions; index++) { 3232 const JavaVMOption* option = args->options + index; 3233 const char* tail; 3234 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3235 return true; 3236 } 3237 } 3238 return false; 3239 } 3240 3241 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3242 const char* vm_options_file, 3243 const int vm_options_file_pos, 3244 ScopedVMInitArgs* vm_options_file_args, 3245 ScopedVMInitArgs* args_out) { 3246 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3247 if (code != JNI_OK) { 3248 return code; 3249 } 3250 3251 if (vm_options_file_args->get()->nOptions < 1) { 3252 return JNI_OK; 3253 } 3254 3255 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3256 jio_fprintf(defaultStream::error_stream(), 3257 "A VM options file may not refer to a VM options file. " 3258 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3259 "options file '%s' in options container '%s' is an error.\n", 3260 vm_options_file_args->vm_options_file_arg(), 3261 vm_options_file_args->container_name()); 3262 return JNI_EINVAL; 3263 } 3264 3265 return args_out->insert(args, vm_options_file_args->get(), 3266 vm_options_file_pos); 3267 } 3268 3269 // Expand -XX:VMOptionsFile found in args_in as needed. 3270 // mod_args and args_out parameters may return values as needed. 3271 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3272 ScopedVMInitArgs* mod_args, 3273 JavaVMInitArgs** args_out) { 3274 jint code = match_special_option_and_act(args_in, mod_args); 3275 if (code != JNI_OK) { 3276 return code; 3277 } 3278 3279 if (mod_args->is_set()) { 3280 // args_in contains -XX:VMOptionsFile and mod_args contains the 3281 // original options from args_in along with the options expanded 3282 // from the VMOptionsFile. Return a short-hand to the caller. 3283 *args_out = mod_args->get(); 3284 } else { 3285 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3286 } 3287 return JNI_OK; 3288 } 3289 3290 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3291 ScopedVMInitArgs* args_out) { 3292 // Remaining part of option string 3293 const char* tail; 3294 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3295 3296 for (int index = 0; index < args->nOptions; index++) { 3297 const JavaVMOption* option = args->options + index; 3298 if (match_option(option, "-XX:Flags=", &tail)) { 3299 Arguments::set_jvm_flags_file(tail); 3300 continue; 3301 } 3302 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3303 if (vm_options_file_args.found_vm_options_file_arg()) { 3304 jio_fprintf(defaultStream::error_stream(), 3305 "The option '%s' is already specified in the options " 3306 "container '%s' so the specification of '%s' in the " 3307 "same options container is an error.\n", 3308 vm_options_file_args.vm_options_file_arg(), 3309 vm_options_file_args.container_name(), 3310 option->optionString); 3311 return JNI_EINVAL; 3312 } 3313 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3314 // If there's a VMOptionsFile, parse that 3315 jint code = insert_vm_options_file(args, tail, index, 3316 &vm_options_file_args, args_out); 3317 if (code != JNI_OK) { 3318 return code; 3319 } 3320 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3321 if (args_out->is_set()) { 3322 // The VMOptions file inserted some options so switch 'args' 3323 // to the new set of options, and continue processing which 3324 // preserves "last option wins" semantics. 3325 args = args_out->get(); 3326 // The first option from the VMOptionsFile replaces the 3327 // current option. So we back track to process the 3328 // replacement option. 3329 index--; 3330 } 3331 continue; 3332 } 3333 if (match_option(option, "-XX:+PrintVMOptions")) { 3334 PrintVMOptions = true; 3335 continue; 3336 } 3337 if (match_option(option, "-XX:-PrintVMOptions")) { 3338 PrintVMOptions = false; 3339 continue; 3340 } 3341 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3342 IgnoreUnrecognizedVMOptions = true; 3343 continue; 3344 } 3345 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3346 IgnoreUnrecognizedVMOptions = false; 3347 continue; 3348 } 3349 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3350 JVMFlag::printFlags(tty, false); 3351 vm_exit(0); 3352 } 3353 3354 #ifndef PRODUCT 3355 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3356 JVMFlag::printFlags(tty, true); 3357 vm_exit(0); 3358 } 3359 #endif 3360 } 3361 return JNI_OK; 3362 } 3363 3364 static void print_options(const JavaVMInitArgs *args) { 3365 const char* tail; 3366 for (int index = 0; index < args->nOptions; index++) { 3367 const JavaVMOption *option = args->options + index; 3368 if (match_option(option, "-XX:", &tail)) { 3369 logOption(tail); 3370 } 3371 } 3372 } 3373 3374 bool Arguments::handle_deprecated_print_gc_flags() { 3375 if (PrintGC) { 3376 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3377 } 3378 if (PrintGCDetails) { 3379 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3380 } 3381 3382 if (_legacyGCLogging.lastFlag == 2) { 3383 // -Xloggc was used to specify a filename 3384 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3385 3386 LogTarget(Error, logging) target; 3387 LogStream errstream(target); 3388 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream); 3389 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3390 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3391 } 3392 return true; 3393 } 3394 3395 static void apply_debugger_ergo() { 3396 #ifdef ASSERT 3397 if (ReplayCompiles) { 3398 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3399 } 3400 3401 if (UseDebuggerErgo) { 3402 // Turn on sub-flags 3403 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3404 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3405 } 3406 3407 if (UseDebuggerErgo2) { 3408 // Debugging with limited number of CPUs 3409 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3410 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3411 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3412 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3413 } 3414 #endif // ASSERT 3415 } 3416 3417 // Parse entry point called from JNI_CreateJavaVM 3418 3419 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3420 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3421 JVMFlag::check_all_flag_declarations(); 3422 3423 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3424 const char* hotspotrc = ".hotspotrc"; 3425 bool settings_file_specified = false; 3426 bool needs_hotspotrc_warning = false; 3427 ScopedVMInitArgs initial_vm_options_args(""); 3428 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3429 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3430 3431 // Pointers to current working set of containers 3432 JavaVMInitArgs* cur_cmd_args; 3433 JavaVMInitArgs* cur_vm_options_args; 3434 JavaVMInitArgs* cur_java_options_args; 3435 JavaVMInitArgs* cur_java_tool_options_args; 3436 3437 // Containers for modified/expanded options 3438 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3439 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3440 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3441 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3442 3443 3444 jint code = 3445 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3446 if (code != JNI_OK) { 3447 return code; 3448 } 3449 3450 code = parse_java_options_environment_variable(&initial_java_options_args); 3451 if (code != JNI_OK) { 3452 return code; 3453 } 3454 3455 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3456 char *vmoptions = ClassLoader::lookup_vm_options(); 3457 if (vmoptions != nullptr) { 3458 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3459 FREE_C_HEAP_ARRAY(char, vmoptions); 3460 if (code != JNI_OK) { 3461 return code; 3462 } 3463 } 3464 3465 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3466 &mod_java_tool_options_args, 3467 &cur_java_tool_options_args); 3468 if (code != JNI_OK) { 3469 return code; 3470 } 3471 3472 code = expand_vm_options_as_needed(initial_cmd_args, 3473 &mod_cmd_args, 3474 &cur_cmd_args); 3475 if (code != JNI_OK) { 3476 return code; 3477 } 3478 3479 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3480 &mod_java_options_args, 3481 &cur_java_options_args); 3482 if (code != JNI_OK) { 3483 return code; 3484 } 3485 3486 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3487 &mod_vm_options_args, 3488 &cur_vm_options_args); 3489 if (code != JNI_OK) { 3490 return code; 3491 } 3492 3493 const char* flags_file = Arguments::get_jvm_flags_file(); 3494 settings_file_specified = (flags_file != nullptr); 3495 3496 if (IgnoreUnrecognizedVMOptions) { 3497 cur_cmd_args->ignoreUnrecognized = true; 3498 cur_java_tool_options_args->ignoreUnrecognized = true; 3499 cur_java_options_args->ignoreUnrecognized = true; 3500 } 3501 3502 // Parse specified settings file 3503 if (settings_file_specified) { 3504 if (!process_settings_file(flags_file, true, 3505 cur_cmd_args->ignoreUnrecognized)) { 3506 return JNI_EINVAL; 3507 } 3508 } else { 3509 #ifdef ASSERT 3510 // Parse default .hotspotrc settings file 3511 if (!process_settings_file(".hotspotrc", false, 3512 cur_cmd_args->ignoreUnrecognized)) { 3513 return JNI_EINVAL; 3514 } 3515 #else 3516 struct stat buf; 3517 if (os::stat(hotspotrc, &buf) == 0) { 3518 needs_hotspotrc_warning = true; 3519 } 3520 #endif 3521 } 3522 3523 if (PrintVMOptions) { 3524 print_options(cur_java_tool_options_args); 3525 print_options(cur_cmd_args); 3526 print_options(cur_java_options_args); 3527 } 3528 3529 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3530 jint result = parse_vm_init_args(cur_vm_options_args, 3531 cur_java_tool_options_args, 3532 cur_java_options_args, 3533 cur_cmd_args); 3534 3535 if (result != JNI_OK) { 3536 return result; 3537 } 3538 3539 // Delay warning until here so that we've had a chance to process 3540 // the -XX:-PrintWarnings flag 3541 if (needs_hotspotrc_warning) { 3542 warning("%s file is present but has been ignored. " 3543 "Run with -XX:Flags=%s to load the file.", 3544 hotspotrc, hotspotrc); 3545 } 3546 3547 if (needs_module_property_warning) { 3548 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3549 " names that are reserved for internal use."); 3550 } 3551 3552 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3553 UNSUPPORTED_OPTION(UseLargePages); 3554 #endif 3555 3556 #if defined(AIX) 3557 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3558 #endif 3559 3560 #ifndef PRODUCT 3561 if (TraceBytecodesAt != 0) { 3562 TraceBytecodes = true; 3563 } 3564 #endif // PRODUCT 3565 3566 if (ScavengeRootsInCode == 0) { 3567 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3568 warning("Forcing ScavengeRootsInCode non-zero"); 3569 } 3570 ScavengeRootsInCode = 1; 3571 } 3572 3573 if (!handle_deprecated_print_gc_flags()) { 3574 return JNI_EINVAL; 3575 } 3576 3577 // Set object alignment values. 3578 set_object_alignment(); 3579 3580 #if !INCLUDE_CDS 3581 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) { 3582 jio_fprintf(defaultStream::error_stream(), 3583 "Shared spaces are not supported in this VM\n"); 3584 return JNI_ERR; 3585 } 3586 if (DumpLoadedClassList != nullptr) { 3587 jio_fprintf(defaultStream::error_stream(), 3588 "DumpLoadedClassList is not supported in this VM\n"); 3589 return JNI_ERR; 3590 } 3591 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) || 3592 log_is_enabled(Info, cds)) { 3593 warning("Shared spaces are not supported in this VM"); 3594 UseSharedSpaces = false; 3595 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3596 } 3597 no_shared_spaces("CDS Disabled"); 3598 #endif // INCLUDE_CDS 3599 3600 // Verify NMT arguments 3601 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 3602 if (lvl == NMT_unknown) { 3603 jio_fprintf(defaultStream::error_stream(), 3604 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n"); 3605 return JNI_ERR; 3606 } 3607 if (PrintNMTStatistics && lvl == NMT_off) { 3608 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 3609 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 3610 } 3611 3612 bool trace_dependencies = log_is_enabled(Debug, dependencies); 3613 if (trace_dependencies && VerifyDependencies) { 3614 warning("dependency logging results may be inflated by VerifyDependencies"); 3615 } 3616 3617 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) || 3618 log_is_enabled(Info, class, load, cause); 3619 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) { 3620 warning("class load cause logging will not produce output without LogClassLoadingCauseFor"); 3621 } 3622 3623 apply_debugger_ergo(); 3624 3625 // The VMThread needs to stop now and then to execute these debug options. 3626 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) { 3627 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000); 3628 } 3629 3630 if (log_is_enabled(Info, arguments)) { 3631 LogStream st(Log(arguments)::info()); 3632 Arguments::print_on(&st); 3633 } 3634 3635 return JNI_OK; 3636 } 3637 3638 jint Arguments::apply_ergo() { 3639 // Set flags based on ergonomics. 3640 jint result = set_ergonomics_flags(); 3641 if (result != JNI_OK) return result; 3642 3643 // Set heap size based on available physical memory 3644 set_heap_size(); 3645 3646 GCConfig::arguments()->initialize(); 3647 3648 CDSConfig::initialize(); 3649 3650 // Initialize Metaspace flags and alignments 3651 Metaspace::ergo_initialize(); 3652 3653 if (!StringDedup::ergo_initialize()) { 3654 return JNI_EINVAL; 3655 } 3656 3657 // Set compiler flags after GC is selected and GC specific 3658 // flags (LoopStripMiningIter) are set. 3659 CompilerConfig::ergo_initialize(); 3660 3661 // Set bytecode rewriting flags 3662 set_bytecode_flags(); 3663 3664 // Set flags if aggressive optimization flags are enabled 3665 jint code = set_aggressive_opts_flags(); 3666 if (code != JNI_OK) { 3667 return code; 3668 } 3669 3670 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) { 3671 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table()); 3672 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) { 3673 warning("UseSecondarySupersTable is not supported"); 3674 FLAG_SET_DEFAULT(UseSecondarySupersTable, false); 3675 } 3676 if (!UseSecondarySupersTable) { 3677 FLAG_SET_DEFAULT(StressSecondarySupers, false); 3678 FLAG_SET_DEFAULT(VerifySecondarySupers, false); 3679 } 3680 3681 #ifdef ZERO 3682 // Clear flags not supported on zero. 3683 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3684 #endif // ZERO 3685 3686 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3687 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3688 DebugNonSafepoints = true; 3689 } 3690 3691 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3692 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3693 } 3694 3695 // Treat the odd case where local verification is enabled but remote 3696 // verification is not as if both were enabled. 3697 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 3698 log_info(verification)("Turning on remote verification because local verification is on"); 3699 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 3700 } 3701 3702 #ifndef PRODUCT 3703 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3704 if (use_vm_log()) { 3705 LogVMOutput = true; 3706 } 3707 } 3708 #endif // PRODUCT 3709 3710 if (PrintCommandLineFlags) { 3711 JVMFlag::printSetFlags(tty); 3712 } 3713 3714 #if COMPILER2_OR_JVMCI 3715 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 3716 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 3717 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 3718 } 3719 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 3720 3721 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 3722 if (!EnableVectorReboxing) { 3723 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 3724 } else { 3725 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 3726 } 3727 } 3728 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 3729 3730 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 3731 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 3732 } 3733 FLAG_SET_DEFAULT(UseVectorStubs, false); 3734 } 3735 #endif // COMPILER2_OR_JVMCI 3736 3737 if (log_is_enabled(Info, perf, class, link)) { 3738 if (!UsePerfData) { 3739 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off."); 3740 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link)); 3741 } 3742 } 3743 3744 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 3745 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 3746 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 3747 } 3748 } 3749 return JNI_OK; 3750 } 3751 3752 jint Arguments::adjust_after_os() { 3753 if (UseNUMA) { 3754 if (UseParallelGC) { 3755 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3756 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3757 } 3758 } 3759 } 3760 return JNI_OK; 3761 } 3762 3763 int Arguments::PropertyList_count(SystemProperty* pl) { 3764 int count = 0; 3765 while(pl != nullptr) { 3766 count++; 3767 pl = pl->next(); 3768 } 3769 return count; 3770 } 3771 3772 // Return the number of readable properties. 3773 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 3774 int count = 0; 3775 while(pl != nullptr) { 3776 if (pl->readable()) { 3777 count++; 3778 } 3779 pl = pl->next(); 3780 } 3781 return count; 3782 } 3783 3784 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3785 assert(key != nullptr, "just checking"); 3786 SystemProperty* prop; 3787 for (prop = pl; prop != nullptr; prop = prop->next()) { 3788 if (strcmp(key, prop->key()) == 0) return prop->value(); 3789 } 3790 return nullptr; 3791 } 3792 3793 // Return the value of the requested property provided that it is a readable property. 3794 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 3795 assert(key != nullptr, "just checking"); 3796 SystemProperty* prop; 3797 // Return the property value if the keys match and the property is not internal or 3798 // it's the special internal property "jdk.boot.class.path.append". 3799 for (prop = pl; prop != nullptr; prop = prop->next()) { 3800 if (strcmp(key, prop->key()) == 0) { 3801 if (!prop->internal()) { 3802 return prop->value(); 3803 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 3804 return prop->value(); 3805 } else { 3806 // Property is internal and not jdk.boot.class.path.append so return null. 3807 return nullptr; 3808 } 3809 } 3810 } 3811 return nullptr; 3812 } 3813 3814 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3815 SystemProperty* p = *plist; 3816 if (p == nullptr) { 3817 *plist = new_p; 3818 } else { 3819 while (p->next() != nullptr) { 3820 p = p->next(); 3821 } 3822 p->set_next(new_p); 3823 } 3824 } 3825 3826 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 3827 bool writeable, bool internal) { 3828 if (plist == nullptr) 3829 return; 3830 3831 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 3832 PropertyList_add(plist, new_p); 3833 } 3834 3835 void Arguments::PropertyList_add(SystemProperty *element) { 3836 PropertyList_add(&_system_properties, element); 3837 } 3838 3839 // This add maintains unique property key in the list. 3840 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 3841 PropertyAppendable append, PropertyWriteable writeable, 3842 PropertyInternal internal) { 3843 if (plist == nullptr) 3844 return; 3845 3846 // If property key exists and is writeable, then update with new value. 3847 // Trying to update a non-writeable property is silently ignored. 3848 SystemProperty* prop; 3849 for (prop = *plist; prop != nullptr; prop = prop->next()) { 3850 if (strcmp(k, prop->key()) == 0) { 3851 if (append == AppendProperty) { 3852 prop->append_writeable_value(v); 3853 } else { 3854 prop->set_writeable_value(v); 3855 } 3856 return; 3857 } 3858 } 3859 3860 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 3861 } 3862 3863 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3864 // Returns true if all of the source pointed by src has been copied over to 3865 // the destination buffer pointed by buf. Otherwise, returns false. 3866 // Notes: 3867 // 1. If the length (buflen) of the destination buffer excluding the 3868 // null terminator character is not long enough for holding the expanded 3869 // pid characters, it also returns false instead of returning the partially 3870 // expanded one. 3871 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3872 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3873 char* buf, size_t buflen) { 3874 const char* p = src; 3875 char* b = buf; 3876 const char* src_end = &src[srclen]; 3877 char* buf_end = &buf[buflen - 1]; 3878 3879 while (p < src_end && b < buf_end) { 3880 if (*p == '%') { 3881 switch (*(++p)) { 3882 case '%': // "%%" ==> "%" 3883 *b++ = *p++; 3884 break; 3885 case 'p': { // "%p" ==> current process id 3886 // buf_end points to the character before the last character so 3887 // that we could write '\0' to the end of the buffer. 3888 size_t buf_sz = buf_end - b + 1; 3889 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3890 3891 // if jio_snprintf fails or the buffer is not long enough to hold 3892 // the expanded pid, returns false. 3893 if (ret < 0 || ret >= (int)buf_sz) { 3894 return false; 3895 } else { 3896 b += ret; 3897 assert(*b == '\0', "fail in copy_expand_pid"); 3898 if (p == src_end && b == buf_end + 1) { 3899 // reach the end of the buffer. 3900 return true; 3901 } 3902 } 3903 p++; 3904 break; 3905 } 3906 default : 3907 *b++ = '%'; 3908 } 3909 } else { 3910 *b++ = *p++; 3911 } 3912 } 3913 *b = '\0'; 3914 return (p == src_end); // return false if not all of the source was copied 3915 } --- EOF ---