1 /* 2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/cds_globals.hpp" 27 #include "cds/filemap.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/moduleEntry.hpp" 31 #include "classfile/stringTable.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "compiler/compilerDefinitions.hpp" 34 #include "gc/shared/gcArguments.hpp" 35 #include "gc/shared/gcConfig.hpp" 36 #include "gc/shared/stringdedup/stringDedup.hpp" 37 #include "gc/shared/tlab_globals.hpp" 38 #include "jvm.h" 39 #include "logging/log.hpp" 40 #include "logging/logConfiguration.hpp" 41 #include "logging/logStream.hpp" 42 #include "logging/logTag.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/oop.inline.hpp" 46 #include "prims/jvmtiExport.hpp" 47 #include "runtime/arguments.hpp" 48 #include "runtime/flags/jvmFlag.hpp" 49 #include "runtime/flags/jvmFlagAccess.hpp" 50 #include "runtime/flags/jvmFlagLimit.hpp" 51 #include "runtime/globals_extension.hpp" 52 #include "runtime/java.hpp" 53 #include "runtime/os.hpp" 54 #include "runtime/safepoint.hpp" 55 #include "runtime/safepointMechanism.hpp" 56 #include "runtime/synchronizer.hpp" 57 #include "runtime/vm_version.hpp" 58 #include "services/management.hpp" 59 #include "services/nmtCommon.hpp" 60 #include "utilities/align.hpp" 61 #include "utilities/debug.hpp" 62 #include "utilities/defaultStream.hpp" 63 #include "utilities/macros.hpp" 64 #include "utilities/parseInteger.hpp" 65 #include "utilities/powerOfTwo.hpp" 66 #include "utilities/stringUtils.hpp" 67 #if INCLUDE_JFR 68 #include "jfr/jfr.hpp" 69 #endif 70 71 #include <limits> 72 73 #define DEFAULT_JAVA_LAUNCHER "generic" 74 75 char* Arguments::_jvm_flags_file = NULL; 76 char** Arguments::_jvm_flags_array = NULL; 77 int Arguments::_num_jvm_flags = 0; 78 char** Arguments::_jvm_args_array = NULL; 79 int Arguments::_num_jvm_args = 0; 80 char* Arguments::_java_command = NULL; 81 SystemProperty* Arguments::_system_properties = NULL; 82 size_t Arguments::_conservative_max_heap_alignment = 0; 83 Arguments::Mode Arguments::_mode = _mixed; 84 bool Arguments::_java_compiler = false; 85 bool Arguments::_xdebug_mode = false; 86 const char* Arguments::_java_vendor_url_bug = NULL; 87 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90 // These parameters are reset in method parse_vm_init_args() 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 96 97 bool Arguments::_enable_preview = false; 98 99 char* Arguments::SharedArchivePath = NULL; 100 char* Arguments::SharedDynamicArchivePath = NULL; 101 102 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 }; 103 104 AgentLibraryList Arguments::_libraryList; 105 AgentLibraryList Arguments::_agentList; 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 = NULL; 111 exit_hook_t Arguments::_exit_hook = NULL; 112 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 113 114 115 SystemProperty *Arguments::_sun_boot_library_path = NULL; 116 SystemProperty *Arguments::_java_library_path = NULL; 117 SystemProperty *Arguments::_java_home = NULL; 118 SystemProperty *Arguments::_java_class_path = NULL; 119 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 120 SystemProperty *Arguments::_vm_info = NULL; 121 122 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 123 PathString *Arguments::_boot_class_path = NULL; 124 bool Arguments::_has_jimage = false; 125 126 char* Arguments::_ext_dirs = NULL; 127 128 // True if -Xshare:auto option was specified. 129 static bool xshare_auto_cmd_line = false; 130 131 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 132 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 133 if (new_value == NULL) { 134 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 135 return false; 136 } 137 if (_value != NULL) { 138 FreeHeap(_value); 139 } 140 _value = new_value; 141 strcpy(_value, value); 142 return true; 143 } 144 145 void PathString::append_value(const char *value) { 146 char *sp; 147 size_t len = 0; 148 if (value != NULL) { 149 len = strlen(value); 150 if (_value != NULL) { 151 len += strlen(_value); 152 } 153 sp = AllocateHeap(len+2, mtArguments); 154 assert(sp != NULL, "Unable to allocate space for new append path value"); 155 if (sp != NULL) { 156 if (_value != NULL) { 157 strcpy(sp, _value); 158 strcat(sp, os::path_separator()); 159 strcat(sp, value); 160 FreeHeap(_value); 161 } else { 162 strcpy(sp, value); 163 } 164 _value = sp; 165 } 166 } 167 } 168 169 PathString::PathString(const char* value) { 170 if (value == NULL) { 171 _value = NULL; 172 } else { 173 _value = AllocateHeap(strlen(value)+1, mtArguments); 174 strcpy(_value, value); 175 } 176 } 177 178 PathString::~PathString() { 179 if (_value != NULL) { 180 FreeHeap(_value); 181 _value = NULL; 182 } 183 } 184 185 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 186 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 187 size_t len = strlen(module_name) + 1; 188 _module_name = AllocateHeap(len, mtInternal); 189 strncpy(_module_name, module_name, len); // copy the trailing null 190 _path = new PathString(path); 191 } 192 193 ModulePatchPath::~ModulePatchPath() { 194 if (_module_name != NULL) { 195 FreeHeap(_module_name); 196 _module_name = NULL; 197 } 198 if (_path != NULL) { 199 delete _path; 200 _path = NULL; 201 } 202 } 203 204 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 205 if (key == NULL) { 206 _key = NULL; 207 } else { 208 _key = AllocateHeap(strlen(key)+1, mtArguments); 209 strcpy(_key, key); 210 } 211 _next = NULL; 212 _internal = internal; 213 _writeable = writeable; 214 } 215 216 AgentLibrary::AgentLibrary(const char* name, const char* options, 217 bool is_absolute_path, void* os_lib, 218 bool instrument_lib) { 219 _name = AllocateHeap(strlen(name)+1, mtArguments); 220 strcpy(_name, name); 221 if (options == NULL) { 222 _options = NULL; 223 } else { 224 _options = AllocateHeap(strlen(options)+1, mtArguments); 225 strcpy(_options, options); 226 } 227 _is_absolute_path = is_absolute_path; 228 _os_lib = os_lib; 229 _next = NULL; 230 _state = agent_invalid; 231 _is_static_lib = false; 232 _is_instrument_lib = instrument_lib; 233 } 234 235 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 236 // part of the option string. 237 static bool match_option(const JavaVMOption *option, const char* name, 238 const char** tail) { 239 size_t len = strlen(name); 240 if (strncmp(option->optionString, name, len) == 0) { 241 *tail = option->optionString + len; 242 return true; 243 } else { 244 return false; 245 } 246 } 247 248 // Check if 'option' matches 'name'. No "tail" is allowed. 249 static bool match_option(const JavaVMOption *option, const char* name) { 250 const char* tail = NULL; 251 bool result = match_option(option, name, &tail); 252 if (tail != NULL && *tail == '\0') { 253 return result; 254 } else { 255 return false; 256 } 257 } 258 259 // Return true if any of the strings in null-terminated array 'names' matches. 260 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 261 // the option must match exactly. 262 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 263 bool tail_allowed) { 264 for (/* empty */; *names != NULL; ++names) { 265 if (match_option(option, *names, tail)) { 266 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 267 return true; 268 } 269 } 270 } 271 return false; 272 } 273 274 #if INCLUDE_JFR 275 static bool _has_jfr_option = false; // is using JFR 276 277 // return true on failure 278 static bool match_jfr_option(const JavaVMOption** option) { 279 assert((*option)->optionString != NULL, "invariant"); 280 char* tail = NULL; 281 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 282 _has_jfr_option = true; 283 return Jfr::on_start_flight_recording_option(option, tail); 284 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 285 _has_jfr_option = true; 286 return Jfr::on_flight_recorder_option(option, tail); 287 } 288 return false; 289 } 290 291 bool Arguments::has_jfr_option() { 292 return _has_jfr_option; 293 } 294 #endif 295 296 static void logOption(const char* opt) { 297 if (PrintVMOptions) { 298 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 299 } 300 } 301 302 bool needs_module_property_warning = false; 303 304 #define MODULE_PROPERTY_PREFIX "jdk.module." 305 #define MODULE_PROPERTY_PREFIX_LEN 11 306 #define ADDEXPORTS "addexports" 307 #define ADDEXPORTS_LEN 10 308 #define ADDREADS "addreads" 309 #define ADDREADS_LEN 8 310 #define ADDOPENS "addopens" 311 #define ADDOPENS_LEN 8 312 #define PATCH "patch" 313 #define PATCH_LEN 5 314 #define ADDMODS "addmods" 315 #define ADDMODS_LEN 7 316 #define LIMITMODS "limitmods" 317 #define LIMITMODS_LEN 9 318 #define PATH "path" 319 #define PATH_LEN 4 320 #define UPGRADE_PATH "upgrade.path" 321 #define UPGRADE_PATH_LEN 12 322 #define ENABLE_NATIVE_ACCESS "enable.native.access" 323 #define ENABLE_NATIVE_ACCESS_LEN 20 324 325 void Arguments::add_init_library(const char* name, char* options) { 326 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 327 } 328 329 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 330 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 331 } 332 333 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 334 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 335 } 336 337 // Late-binding agents not started via arguments 338 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 339 _agentList.add(agentLib); 340 } 341 342 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 343 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 344 return ((strncmp(option, property, len) == 0) && 345 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 346 } 347 348 // Return true if property starts with "jdk.module." and its ensuing chars match 349 // any of the reserved module properties. 350 // property should be passed without the leading "-D". 351 bool Arguments::is_internal_module_property(const char* property) { 352 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 353 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 354 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 355 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 356 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 357 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 358 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 359 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 360 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 361 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 362 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 363 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 364 return true; 365 } 366 } 367 return false; 368 } 369 370 // Process java launcher properties. 371 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 372 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 373 // Must do this before setting up other system properties, 374 // as some of them may depend on launcher type. 375 for (int index = 0; index < args->nOptions; index++) { 376 const JavaVMOption* option = args->options + index; 377 const char* tail; 378 379 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 380 process_java_launcher_argument(tail, option->extraInfo); 381 continue; 382 } 383 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 384 if (strcmp(tail, "true") == 0) { 385 _sun_java_launcher_is_altjvm = true; 386 } 387 continue; 388 } 389 } 390 } 391 392 // Initialize system properties key and value. 393 void Arguments::init_system_properties() { 394 395 // Set up _boot_class_path which is not a property but 396 // relies heavily on argument processing and the jdk.boot.class.path.append 397 // property. It is used to store the underlying boot class path. 398 _boot_class_path = new PathString(NULL); 399 400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 401 "Java Virtual Machine Specification", false)); 402 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 403 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 404 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 405 406 // Initialize the vm.info now, but it will need updating after argument parsing. 407 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 408 409 // Following are JVMTI agent writable properties. 410 // Properties values are set to NULL and they are 411 // os specific they are initialized in os::init_system_properties_values(). 412 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 413 _java_library_path = new SystemProperty("java.library.path", NULL, true); 414 _java_home = new SystemProperty("java.home", NULL, true); 415 _java_class_path = new SystemProperty("java.class.path", "", true); 416 // jdk.boot.class.path.append is a non-writeable, internal property. 417 // It can only be set by either: 418 // - -Xbootclasspath/a: 419 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 420 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", NULL, false, true); 421 422 // Add to System Property list. 423 PropertyList_add(&_system_properties, _sun_boot_library_path); 424 PropertyList_add(&_system_properties, _java_library_path); 425 PropertyList_add(&_system_properties, _java_home); 426 PropertyList_add(&_system_properties, _java_class_path); 427 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 428 PropertyList_add(&_system_properties, _vm_info); 429 430 // Set OS specific system properties values 431 os::init_system_properties_values(); 432 } 433 434 // Update/Initialize System properties after JDK version number is known 435 void Arguments::init_version_specific_system_properties() { 436 enum { bufsz = 16 }; 437 char buffer[bufsz]; 438 const char* spec_vendor = "Oracle Corporation"; 439 uint32_t spec_version = JDK_Version::current().major_version(); 440 441 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 442 443 PropertyList_add(&_system_properties, 444 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 445 PropertyList_add(&_system_properties, 446 new SystemProperty("java.vm.specification.version", buffer, false)); 447 PropertyList_add(&_system_properties, 448 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 449 } 450 451 /* 452 * -XX argument processing: 453 * 454 * -XX arguments are defined in several places, such as: 455 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 456 * -XX arguments are parsed in parse_argument(). 457 * -XX argument bounds checking is done in check_vm_args_consistency(). 458 * 459 * Over time -XX arguments may change. There are mechanisms to handle common cases: 460 * 461 * ALIASED: An option that is simply another name for another option. This is often 462 * part of the process of deprecating a flag, but not all aliases need 463 * to be deprecated. 464 * 465 * Create an alias for an option by adding the old and new option names to the 466 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 467 * 468 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 469 * support may be removed in the future. Both regular and aliased options may be 470 * deprecated. 471 * 472 * Add a deprecation warning for an option (or alias) by adding an entry in the 473 * "special_jvm_flags" table and setting the "deprecated_in" field. 474 * Often an option "deprecated" in one major release will 475 * be made "obsolete" in the next. In this case the entry should also have its 476 * "obsolete_in" field set. 477 * 478 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 479 * on the command line. A warning is printed to let the user know that option might not 480 * be accepted in the future. 481 * 482 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 483 * table and setting the "obsolete_in" field. 484 * 485 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 486 * to the current JDK version. The system will flatly refuse to admit the existence of 487 * the flag. This allows a flag to die automatically over JDK releases. 488 * 489 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 490 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 491 * - Newly obsolete or expired deprecated options should have their global variable 492 * definitions removed (from globals.hpp, etc) and related implementations removed. 493 * 494 * Recommended approach for removing options: 495 * 496 * To remove options commonly used by customers (e.g. product -XX options), use 497 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 498 * 499 * To remove internal options (e.g. diagnostic, experimental, develop options), use 500 * a 2-step model adding major release numbers to the obsolete and expire columns. 501 * 502 * To change the name of an option, use the alias table as well as a 2-step 503 * model adding major release numbers to the deprecate and expire columns. 504 * Think twice about aliasing commonly used customer options. 505 * 506 * There are times when it is appropriate to leave a future release number as undefined. 507 * 508 * Tests: Aliases should be tested in VMAliasOptions.java. 509 * Deprecated options should be tested in VMDeprecatedOptions.java. 510 */ 511 512 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 513 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 514 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 515 // the command-line as usual, but will issue a warning. 516 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 517 // the command-line, while issuing a warning and ignoring the flag value. 518 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 519 // existence of the flag. 520 // 521 // MANUAL CLEANUP ON JDK VERSION UPDATES: 522 // This table ensures that the handling of options will update automatically when the JDK 523 // version is incremented, but the source code needs to be cleanup up manually: 524 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 525 // variable should be removed, as well as users of the variable. 526 // - As "deprecated" options age into "obsolete" options, move the entry into the 527 // "Obsolete Flags" section of the table. 528 // - All expired options should be removed from the table. 529 static SpecialFlag const special_jvm_flags[] = { 530 // -------------- Deprecated Flags -------------- 531 // --- Non-alias flags - sorted by obsolete_in then expired_in: 532 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 533 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 534 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 535 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 536 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 537 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 538 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 539 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 540 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 541 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 542 { "EnableWaitForParallelLoad", JDK_Version::jdk(20), JDK_Version::jdk(21), JDK_Version::jdk(22) }, 543 544 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 545 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 546 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 547 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 548 549 // -------------- Obsolete Flags - sorted by expired_in -------------- 550 551 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 552 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 553 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 554 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 555 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 556 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 557 558 #ifdef ASSERT 559 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 560 #endif 561 562 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 563 // These entries will generate build errors. Their purpose is to test the macros. 564 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 565 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 566 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 567 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 568 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 569 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 570 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 571 #endif 572 573 { NULL, JDK_Version(0), JDK_Version(0) } 574 }; 575 576 // Flags that are aliases for other flags. 577 typedef struct { 578 const char* alias_name; 579 const char* real_name; 580 } AliasedFlag; 581 582 static AliasedFlag const aliased_jvm_flags[] = { 583 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 584 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 585 { NULL, NULL} 586 }; 587 588 // Return true if "v" is less than "other", where "other" may be "undefined". 589 static bool version_less_than(JDK_Version v, JDK_Version other) { 590 assert(!v.is_undefined(), "must be defined"); 591 if (!other.is_undefined() && v.compare(other) >= 0) { 592 return false; 593 } else { 594 return true; 595 } 596 } 597 598 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 599 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 600 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 601 flag = special_jvm_flags[i]; 602 return true; 603 } 604 } 605 return false; 606 } 607 608 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 609 assert(version != NULL, "Must provide a version buffer"); 610 SpecialFlag flag; 611 if (lookup_special_flag(flag_name, flag)) { 612 if (!flag.obsolete_in.is_undefined()) { 613 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 614 *version = flag.obsolete_in; 615 // This flag may have been marked for obsoletion in this version, but we may not 616 // have actually removed it yet. Rather than ignoring it as soon as we reach 617 // this version we allow some time for the removal to happen. So if the flag 618 // still actually exists we process it as normal, but issue an adjusted warning. 619 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 620 if (real_flag != NULL) { 621 char version_str[256]; 622 version->to_string(version_str, sizeof(version_str)); 623 warning("Temporarily processing option %s; support is scheduled for removal in %s", 624 flag_name, version_str); 625 return false; 626 } 627 return true; 628 } 629 } 630 } 631 return false; 632 } 633 634 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 635 assert(version != NULL, "Must provide a version buffer"); 636 SpecialFlag flag; 637 if (lookup_special_flag(flag_name, flag)) { 638 if (!flag.deprecated_in.is_undefined()) { 639 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 640 version_less_than(JDK_Version::current(), flag.expired_in)) { 641 *version = flag.deprecated_in; 642 return 1; 643 } else { 644 return -1; 645 } 646 } 647 } 648 return 0; 649 } 650 651 const char* Arguments::real_flag_name(const char *flag_name) { 652 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 653 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 654 if (strcmp(flag_status.alias_name, flag_name) == 0) { 655 return flag_status.real_name; 656 } 657 } 658 return flag_name; 659 } 660 661 #ifdef ASSERT 662 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 663 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 664 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 665 return true; 666 } 667 } 668 return false; 669 } 670 671 // Verifies the correctness of the entries in the special_jvm_flags table. 672 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 673 // version being earlier than the deprecation version, then a warning is issued 674 // and verification fails - by returning false. If it is detected that the table 675 // is out of date, with respect to the current version, then ideally a warning is 676 // issued but verification does not fail. This allows the VM to operate when the 677 // version is first updated, without needing to update all the impacted flags at 678 // the same time. In practice we can't issue the warning immediately when the version 679 // is updated as it occurs for every test and some tests are not prepared to handle 680 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 681 // if the check_globals flag is true, and in addition allow a grace period and only 682 // check for stale flags when we hit build 25 (which is far enough into the 6 month 683 // release cycle that all flag updates should have been processed, whilst still 684 // leaving time to make the change before RDP2). 685 // We use a gtest to call this, passing true, so that we can detect stale flags before 686 // the end of the release cycle. 687 688 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 689 690 bool Arguments::verify_special_jvm_flags(bool check_globals) { 691 bool success = true; 692 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 693 const SpecialFlag& flag = special_jvm_flags[i]; 694 if (lookup_special_flag(flag.name, i)) { 695 warning("Duplicate special flag declaration \"%s\"", flag.name); 696 success = false; 697 } 698 if (flag.deprecated_in.is_undefined() && 699 flag.obsolete_in.is_undefined()) { 700 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 701 success = false; 702 } 703 704 if (!flag.deprecated_in.is_undefined()) { 705 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 706 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 707 success = false; 708 } 709 710 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 711 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 712 success = false; 713 } 714 } 715 716 if (!flag.obsolete_in.is_undefined()) { 717 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 718 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 719 success = false; 720 } 721 722 // if flag has become obsolete it should not have a "globals" flag defined anymore. 723 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 724 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 725 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 726 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 727 success = false; 728 } 729 } 730 731 } else if (!flag.expired_in.is_undefined()) { 732 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 733 success = false; 734 } 735 736 if (!flag.expired_in.is_undefined()) { 737 // if flag has become expired it should not have a "globals" flag defined anymore. 738 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 739 !version_less_than(JDK_Version::current(), flag.expired_in)) { 740 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 741 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 742 success = false; 743 } 744 } 745 } 746 } 747 return success; 748 } 749 #endif 750 751 bool Arguments::atojulong(const char *s, julong* result) { 752 return parse_integer(s, result); 753 } 754 755 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 756 if (size < min_size) return arg_too_small; 757 if (size > max_size) return arg_too_big; 758 return arg_in_range; 759 } 760 761 // Describe an argument out of range error 762 void Arguments::describe_range_error(ArgsRange errcode) { 763 switch(errcode) { 764 case arg_too_big: 765 jio_fprintf(defaultStream::error_stream(), 766 "The specified size exceeds the maximum " 767 "representable size.\n"); 768 break; 769 case arg_too_small: 770 case arg_unreadable: 771 case arg_in_range: 772 // do nothing for now 773 break; 774 default: 775 ShouldNotReachHere(); 776 } 777 } 778 779 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 780 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 781 return true; 782 } else { 783 return false; 784 } 785 } 786 787 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 788 // strtod allows leading whitespace, but our flag format does not. 789 if (*value == '\0' || isspace(*value)) { 790 return false; 791 } 792 char* end; 793 errno = 0; 794 double v = strtod(value, &end); 795 if ((errno != 0) || (*end != 0)) { 796 return false; 797 } 798 if (g_isnan(v) || !g_isfinite(v)) { 799 // Currently we cannot handle these special values. 800 return false; 801 } 802 803 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 804 return true; 805 } 806 return false; 807 } 808 809 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 810 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 811 812 if (flag->is_int()) { 813 int v; 814 if (parse_integer(value, &v)) { 815 result = JVMFlagAccess::set_int(flag, &v, origin); 816 } 817 } else if (flag->is_uint()) { 818 uint v; 819 if (parse_integer(value, &v)) { 820 result = JVMFlagAccess::set_uint(flag, &v, origin); 821 } 822 } else if (flag->is_intx()) { 823 intx v; 824 if (parse_integer(value, &v)) { 825 result = JVMFlagAccess::set_intx(flag, &v, origin); 826 } 827 } else if (flag->is_uintx()) { 828 uintx v; 829 if (parse_integer(value, &v)) { 830 result = JVMFlagAccess::set_uintx(flag, &v, origin); 831 } 832 } else if (flag->is_uint64_t()) { 833 uint64_t v; 834 if (parse_integer(value, &v)) { 835 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 836 } 837 } else if (flag->is_size_t()) { 838 size_t v; 839 if (parse_integer(value, &v)) { 840 result = JVMFlagAccess::set_size_t(flag, &v, origin); 841 } 842 } 843 844 return result == JVMFlag::SUCCESS; 845 } 846 847 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 848 if (value[0] == '\0') { 849 value = NULL; 850 } 851 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 852 // Contract: JVMFlag always returns a pointer that needs freeing. 853 FREE_C_HEAP_ARRAY(char, value); 854 return true; 855 } 856 857 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 858 const char* old_value = ""; 859 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 860 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 861 size_t new_len = strlen(new_value); 862 const char* value; 863 char* free_this_too = NULL; 864 if (old_len == 0) { 865 value = new_value; 866 } else if (new_len == 0) { 867 value = old_value; 868 } else { 869 size_t length = old_len + 1 + new_len + 1; 870 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 871 // each new setting adds another LINE to the switch: 872 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 873 value = buf; 874 free_this_too = buf; 875 } 876 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 877 // JVMFlag always returns a pointer that needs freeing. 878 FREE_C_HEAP_ARRAY(char, value); 879 // JVMFlag made its own copy, so I must delete my own temp. buffer. 880 FREE_C_HEAP_ARRAY(char, free_this_too); 881 return true; 882 } 883 884 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 885 const char* real_name = real_flag_name(arg); 886 JDK_Version since = JDK_Version(); 887 switch (is_deprecated_flag(arg, &since)) { 888 case -1: { 889 // Obsolete or expired, so don't process normally, 890 // but allow for an obsolete flag we're still 891 // temporarily allowing. 892 if (!is_obsolete_flag(arg, &since)) { 893 return real_name; 894 } 895 // Note if we're not considered obsolete then we can't be expired either 896 // as obsoletion must come first. 897 return NULL; 898 } 899 case 0: 900 return real_name; 901 case 1: { 902 char version[256]; 903 since.to_string(version, sizeof(version)); 904 if (real_name != arg) { 905 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 906 arg, version, real_name); 907 } else { 908 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 909 arg, version); 910 } 911 return real_name; 912 } 913 } 914 ShouldNotReachHere(); 915 return NULL; 916 } 917 918 #define BUFLEN 255 919 920 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 921 char name_copied[BUFLEN+1]; 922 if (name[name_length] != 0) { 923 if (name_length > BUFLEN) { 924 return NULL; 925 } else { 926 strncpy(name_copied, name, name_length); 927 name_copied[name_length] = '\0'; 928 name = name_copied; 929 } 930 } 931 932 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 933 if (real_name == NULL) { 934 return NULL; 935 } 936 JVMFlag* flag = JVMFlag::find_flag(real_name); 937 return flag; 938 } 939 940 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 941 bool is_bool = false; 942 bool bool_val = false; 943 char c = *arg; 944 if (c == '+' || c == '-') { 945 is_bool = true; 946 bool_val = (c == '+'); 947 arg++; 948 } 949 950 const char* name = arg; 951 while (true) { 952 c = *arg; 953 if (isalnum(c) || (c == '_')) { 954 ++arg; 955 } else { 956 break; 957 } 958 } 959 960 size_t name_len = size_t(arg - name); 961 if (name_len == 0) { 962 return false; 963 } 964 965 JVMFlag* flag = find_jvm_flag(name, name_len); 966 if (flag == NULL) { 967 return false; 968 } 969 970 if (is_bool) { 971 if (*arg != 0) { 972 // Error -- extra characters such as -XX:+BoolFlag=123 973 return false; 974 } 975 return set_bool_flag(flag, bool_val, origin); 976 } 977 978 if (arg[0] == '=') { 979 const char* value = arg + 1; 980 if (flag->is_ccstr()) { 981 if (flag->ccstr_accumulates()) { 982 return append_to_string_flag(flag, value, origin); 983 } else { 984 return set_string_flag(flag, value, origin); 985 } 986 } else if (flag->is_double()) { 987 return set_fp_numeric_flag(flag, value, origin); 988 } else { 989 return set_numeric_flag(flag, value, origin); 990 } 991 } 992 993 if (arg[0] == ':' && arg[1] == '=') { 994 // -XX:Foo:=xxx will reset the string flag to the given value. 995 const char* value = arg + 2; 996 return set_string_flag(flag, value, origin); 997 } 998 999 return false; 1000 } 1001 1002 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1003 assert(bldarray != NULL, "illegal argument"); 1004 1005 if (arg == NULL) { 1006 return; 1007 } 1008 1009 int new_count = *count + 1; 1010 1011 // expand the array and add arg to the last element 1012 if (*bldarray == NULL) { 1013 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1014 } else { 1015 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1016 } 1017 (*bldarray)[*count] = os::strdup_check_oom(arg); 1018 *count = new_count; 1019 } 1020 1021 void Arguments::build_jvm_args(const char* arg) { 1022 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1023 } 1024 1025 void Arguments::build_jvm_flags(const char* arg) { 1026 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1027 } 1028 1029 // utility function to return a string that concatenates all 1030 // strings in a given char** array 1031 const char* Arguments::build_resource_string(char** args, int count) { 1032 if (args == NULL || count == 0) { 1033 return NULL; 1034 } 1035 size_t length = 0; 1036 for (int i = 0; i < count; i++) { 1037 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1038 } 1039 char* s = NEW_RESOURCE_ARRAY(char, length); 1040 char* dst = s; 1041 for (int j = 0; j < count; j++) { 1042 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1043 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1044 dst += offset; 1045 length -= offset; 1046 } 1047 return (const char*) s; 1048 } 1049 1050 void Arguments::print_on(outputStream* st) { 1051 st->print_cr("VM Arguments:"); 1052 if (num_jvm_flags() > 0) { 1053 st->print("jvm_flags: "); print_jvm_flags_on(st); 1054 st->cr(); 1055 } 1056 if (num_jvm_args() > 0) { 1057 st->print("jvm_args: "); print_jvm_args_on(st); 1058 st->cr(); 1059 } 1060 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1061 if (_java_class_path != NULL) { 1062 char* path = _java_class_path->value(); 1063 size_t len = strlen(path); 1064 st->print("java_class_path (initial): "); 1065 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1066 if (len == 0) { 1067 st->print_raw_cr("<not set>"); 1068 } else { 1069 st->print_raw_cr(path, len); 1070 } 1071 } 1072 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1073 } 1074 1075 void Arguments::print_summary_on(outputStream* st) { 1076 // Print the command line. Environment variables that are helpful for 1077 // reproducing the problem are written later in the hs_err file. 1078 // flags are from setting file 1079 if (num_jvm_flags() > 0) { 1080 st->print_raw("Settings File: "); 1081 print_jvm_flags_on(st); 1082 st->cr(); 1083 } 1084 // args are the command line and environment variable arguments. 1085 st->print_raw("Command Line: "); 1086 if (num_jvm_args() > 0) { 1087 print_jvm_args_on(st); 1088 } 1089 // this is the classfile and any arguments to the java program 1090 if (java_command() != NULL) { 1091 st->print("%s", java_command()); 1092 } 1093 st->cr(); 1094 } 1095 1096 void Arguments::print_jvm_flags_on(outputStream* st) { 1097 if (_num_jvm_flags > 0) { 1098 for (int i=0; i < _num_jvm_flags; i++) { 1099 st->print("%s ", _jvm_flags_array[i]); 1100 } 1101 } 1102 } 1103 1104 void Arguments::print_jvm_args_on(outputStream* st) { 1105 if (_num_jvm_args > 0) { 1106 for (int i=0; i < _num_jvm_args; i++) { 1107 st->print("%s ", _jvm_args_array[i]); 1108 } 1109 } 1110 } 1111 1112 bool Arguments::process_argument(const char* arg, 1113 jboolean ignore_unrecognized, 1114 JVMFlagOrigin origin) { 1115 JDK_Version since = JDK_Version(); 1116 1117 if (parse_argument(arg, origin)) { 1118 return true; 1119 } 1120 1121 // Determine if the flag has '+', '-', or '=' characters. 1122 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1123 const char* const argname = has_plus_minus ? arg + 1 : arg; 1124 1125 size_t arg_len; 1126 const char* equal_sign = strchr(argname, '='); 1127 if (equal_sign == NULL) { 1128 arg_len = strlen(argname); 1129 } else { 1130 arg_len = equal_sign - argname; 1131 } 1132 1133 // Only make the obsolete check for valid arguments. 1134 if (arg_len <= BUFLEN) { 1135 // Construct a string which consists only of the argument name without '+', '-', or '='. 1136 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1137 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1138 if (is_obsolete_flag(stripped_argname, &since)) { 1139 char version[256]; 1140 since.to_string(version, sizeof(version)); 1141 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1142 return true; 1143 } 1144 } 1145 1146 // For locked flags, report a custom error message if available. 1147 // Otherwise, report the standard unrecognized VM option. 1148 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1149 if (found_flag != NULL) { 1150 char locked_message_buf[BUFLEN]; 1151 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1152 if (strlen(locked_message_buf) == 0) { 1153 if (found_flag->is_bool() && !has_plus_minus) { 1154 jio_fprintf(defaultStream::error_stream(), 1155 "Missing +/- setting for VM option '%s'\n", argname); 1156 } else if (!found_flag->is_bool() && has_plus_minus) { 1157 jio_fprintf(defaultStream::error_stream(), 1158 "Unexpected +/- setting in VM option '%s'\n", argname); 1159 } else { 1160 jio_fprintf(defaultStream::error_stream(), 1161 "Improperly specified VM option '%s'\n", argname); 1162 } 1163 } else { 1164 #ifdef PRODUCT 1165 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1166 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1167 if (ignore_unrecognized && mismatched) { 1168 return true; 1169 } 1170 #endif 1171 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1172 } 1173 } else { 1174 if (ignore_unrecognized) { 1175 return true; 1176 } 1177 jio_fprintf(defaultStream::error_stream(), 1178 "Unrecognized VM option '%s'\n", argname); 1179 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1180 if (fuzzy_matched != NULL) { 1181 jio_fprintf(defaultStream::error_stream(), 1182 "Did you mean '%s%s%s'? ", 1183 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1184 fuzzy_matched->name(), 1185 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1186 } 1187 } 1188 1189 // allow for commandline "commenting out" options like -XX:#+Verbose 1190 return arg[0] == '#'; 1191 } 1192 1193 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1194 FILE* stream = os::fopen(file_name, "rb"); 1195 if (stream == NULL) { 1196 if (should_exist) { 1197 jio_fprintf(defaultStream::error_stream(), 1198 "Could not open settings file %s\n", file_name); 1199 return false; 1200 } else { 1201 return true; 1202 } 1203 } 1204 1205 char token[1024]; 1206 int pos = 0; 1207 1208 bool in_white_space = true; 1209 bool in_comment = false; 1210 bool in_quote = false; 1211 char quote_c = 0; 1212 bool result = true; 1213 1214 int c = getc(stream); 1215 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1216 if (in_white_space) { 1217 if (in_comment) { 1218 if (c == '\n') in_comment = false; 1219 } else { 1220 if (c == '#') in_comment = true; 1221 else if (!isspace(c)) { 1222 in_white_space = false; 1223 token[pos++] = c; 1224 } 1225 } 1226 } else { 1227 if (c == '\n' || (!in_quote && isspace(c))) { 1228 // token ends at newline, or at unquoted whitespace 1229 // this allows a way to include spaces in string-valued options 1230 token[pos] = '\0'; 1231 logOption(token); 1232 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1233 build_jvm_flags(token); 1234 pos = 0; 1235 in_white_space = true; 1236 in_quote = false; 1237 } else if (!in_quote && (c == '\'' || c == '"')) { 1238 in_quote = true; 1239 quote_c = c; 1240 } else if (in_quote && (c == quote_c)) { 1241 in_quote = false; 1242 } else { 1243 token[pos++] = c; 1244 } 1245 } 1246 c = getc(stream); 1247 } 1248 if (pos > 0) { 1249 token[pos] = '\0'; 1250 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1251 build_jvm_flags(token); 1252 } 1253 fclose(stream); 1254 return result; 1255 } 1256 1257 //============================================================================================================= 1258 // Parsing of properties (-D) 1259 1260 const char* Arguments::get_property(const char* key) { 1261 return PropertyList_get_value(system_properties(), key); 1262 } 1263 1264 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1265 const char* eq = strchr(prop, '='); 1266 const char* key; 1267 const char* value = ""; 1268 1269 if (eq == NULL) { 1270 // property doesn't have a value, thus use passed string 1271 key = prop; 1272 } else { 1273 // property have a value, thus extract it and save to the 1274 // allocated string 1275 size_t key_len = eq - prop; 1276 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1277 1278 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1279 key = tmp_key; 1280 1281 value = &prop[key_len + 1]; 1282 } 1283 1284 #if INCLUDE_CDS 1285 if (is_internal_module_property(key) || 1286 strcmp(key, "jdk.module.main") == 0) { 1287 MetaspaceShared::disable_optimized_module_handling(); 1288 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value); 1289 } 1290 if (strcmp(key, "jdk.module.showModuleResolution") == 0 || 1291 strcmp(key, "jdk.module.validation") == 0 || 1292 strcmp(key, "java.system.class.loader") == 0) { 1293 MetaspaceShared::disable_full_module_graph(); 1294 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value); 1295 } 1296 #endif 1297 1298 if (strcmp(key, "java.compiler") == 0) { 1299 process_java_compiler_argument(value); 1300 // Record value in Arguments, but let it get passed to Java. 1301 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1302 // sun.java.launcher.is_altjvm property is 1303 // private and is processed in process_sun_java_launcher_properties(); 1304 // the sun.java.launcher property is passed on to the java application 1305 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1306 // append is true, writable is true, internal is false 1307 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1308 WriteableProperty, ExternalProperty); 1309 } else { 1310 if (strcmp(key, "sun.java.command") == 0) { 1311 char *old_java_command = _java_command; 1312 _java_command = os::strdup_check_oom(value, mtArguments); 1313 if (old_java_command != NULL) { 1314 os::free(old_java_command); 1315 } 1316 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1317 // If this property is set on the command line then its value will be 1318 // displayed in VM error logs as the URL at which to submit such logs. 1319 // Normally the URL displayed in error logs is different from the value 1320 // of this system property, so a different property should have been 1321 // used here, but we leave this as-is in case someone depends upon it. 1322 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1323 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1324 // its value without going through the property list or making a Java call. 1325 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1326 if (old_java_vendor_url_bug != NULL) { 1327 os::free((void *)old_java_vendor_url_bug); 1328 } 1329 } 1330 1331 // Create new property and add at the end of the list 1332 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1333 } 1334 1335 if (key != prop) { 1336 // SystemProperty copy passed value, thus free previously allocated 1337 // memory 1338 FreeHeap((void *)key); 1339 } 1340 1341 return true; 1342 } 1343 1344 #if INCLUDE_CDS 1345 const char* unsupported_properties[] = { "jdk.module.limitmods", 1346 "jdk.module.upgrade.path", 1347 "jdk.module.patch.0" }; 1348 const char* unsupported_options[] = { "--limit-modules", 1349 "--upgrade-module-path", 1350 "--patch-module" 1351 }; 1352 void Arguments::check_unsupported_dumping_properties() { 1353 assert(is_dumping_archive(), 1354 "this function is only used with CDS dump time"); 1355 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1356 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1357 SystemProperty* sp = system_properties(); 1358 while (sp != NULL) { 1359 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1360 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1361 vm_exit_during_initialization( 1362 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1363 } 1364 } 1365 sp = sp->next(); 1366 } 1367 1368 // Check for an exploded module build in use with -Xshare:dump. 1369 if (!has_jimage()) { 1370 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1371 } 1372 } 1373 1374 bool Arguments::check_unsupported_cds_runtime_properties() { 1375 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1376 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1377 if (ArchiveClassesAtExit != NULL) { 1378 // dynamic dumping, just return false for now. 1379 // check_unsupported_dumping_properties() will be called later to check the same set of 1380 // properties, and will exit the VM with the correct error message if the unsupported properties 1381 // are used. 1382 return false; 1383 } 1384 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1385 if (get_property(unsupported_properties[i]) != NULL) { 1386 if (RequireSharedSpaces) { 1387 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1388 } else { 1389 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1390 } 1391 return true; 1392 } 1393 } 1394 return false; 1395 } 1396 #endif 1397 1398 //=========================================================================================================== 1399 // Setting int/mixed/comp mode flags 1400 1401 void Arguments::set_mode_flags(Mode mode) { 1402 // Set up default values for all flags. 1403 // If you add a flag to any of the branches below, 1404 // add a default value for it here. 1405 set_java_compiler(false); 1406 _mode = mode; 1407 1408 // Ensure Agent_OnLoad has the correct initial values. 1409 // This may not be the final mode; mode may change later in onload phase. 1410 PropertyList_unique_add(&_system_properties, "java.vm.info", 1411 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1412 1413 UseInterpreter = true; 1414 UseCompiler = true; 1415 UseLoopCounter = true; 1416 1417 // Default values may be platform/compiler dependent - 1418 // use the saved values 1419 ClipInlining = Arguments::_ClipInlining; 1420 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1421 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1422 BackgroundCompilation = Arguments::_BackgroundCompilation; 1423 1424 // Change from defaults based on mode 1425 switch (mode) { 1426 default: 1427 ShouldNotReachHere(); 1428 break; 1429 case _int: 1430 UseCompiler = false; 1431 UseLoopCounter = false; 1432 AlwaysCompileLoopMethods = false; 1433 UseOnStackReplacement = false; 1434 break; 1435 case _mixed: 1436 // same as default 1437 break; 1438 case _comp: 1439 UseInterpreter = false; 1440 BackgroundCompilation = false; 1441 ClipInlining = false; 1442 break; 1443 } 1444 } 1445 1446 // Conflict: required to use shared spaces (-Xshare:on), but 1447 // incompatible command line options were chosen. 1448 static void no_shared_spaces(const char* message) { 1449 if (RequireSharedSpaces) { 1450 jio_fprintf(defaultStream::error_stream(), 1451 "Class data sharing is inconsistent with other specified options.\n"); 1452 vm_exit_during_initialization("Unable to use shared archive", message); 1453 } else { 1454 log_info(cds)("Unable to use shared archive: %s", message); 1455 UseSharedSpaces = false; 1456 } 1457 } 1458 1459 void set_object_alignment() { 1460 // Object alignment. 1461 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1462 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1463 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1464 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1465 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1466 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1467 1468 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1469 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1470 1471 // Oop encoding heap max 1472 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1473 } 1474 1475 size_t Arguments::max_heap_for_compressed_oops() { 1476 // Avoid sign flip. 1477 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1478 // We need to fit both the NULL page and the heap into the memory budget, while 1479 // keeping alignment constraints of the heap. To guarantee the latter, as the 1480 // NULL page is located before the heap, we pad the NULL page to the conservative 1481 // maximum alignment that the GC may ever impose upon the heap. 1482 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1483 _conservative_max_heap_alignment); 1484 1485 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1486 NOT_LP64(ShouldNotReachHere(); return 0); 1487 } 1488 1489 void Arguments::set_use_compressed_oops() { 1490 #ifdef _LP64 1491 // MaxHeapSize is not set up properly at this point, but 1492 // the only value that can override MaxHeapSize if we are 1493 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1494 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1495 1496 if (max_heap_size <= max_heap_for_compressed_oops()) { 1497 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1498 FLAG_SET_ERGO(UseCompressedOops, true); 1499 } 1500 } else { 1501 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1502 warning("Max heap size too large for Compressed Oops"); 1503 FLAG_SET_DEFAULT(UseCompressedOops, false); 1504 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) { 1505 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1506 } 1507 } 1508 } 1509 #endif // _LP64 1510 } 1511 1512 1513 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1514 // set_use_compressed_oops(). 1515 void Arguments::set_use_compressed_klass_ptrs() { 1516 #ifdef _LP64 1517 // On some architectures, the use of UseCompressedClassPointers implies the use of 1518 // UseCompressedOops. The reason is that the rheap_base register of said platforms 1519 // is reused to perform some optimized spilling, in order to use rheap_base as a 1520 // temp register. But by treating it as any other temp register, spilling can typically 1521 // be completely avoided instead. So it is better not to perform this trick. And by 1522 // not having that reliance, large heaps, or heaps not supporting compressed oops, 1523 // can still use compressed class pointers. 1524 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) { 1525 if (UseCompressedClassPointers) { 1526 warning("UseCompressedClassPointers requires UseCompressedOops"); 1527 } 1528 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1529 } else { 1530 // Turn on UseCompressedClassPointers too 1531 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1532 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1533 } 1534 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1535 if (UseCompressedClassPointers) { 1536 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1537 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1538 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1539 } 1540 } 1541 } 1542 #endif // _LP64 1543 } 1544 1545 void Arguments::set_conservative_max_heap_alignment() { 1546 // The conservative maximum required alignment for the heap is the maximum of 1547 // the alignments imposed by several sources: any requirements from the heap 1548 // itself and the maximum page size we may run the VM with. 1549 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1550 _conservative_max_heap_alignment = MAX4(heap_alignment, 1551 (size_t)os::vm_allocation_granularity(), 1552 os::max_page_size(), 1553 GCArguments::compute_heap_alignment()); 1554 } 1555 1556 jint Arguments::set_ergonomics_flags() { 1557 GCConfig::initialize(); 1558 1559 set_conservative_max_heap_alignment(); 1560 1561 #ifdef _LP64 1562 set_use_compressed_oops(); 1563 1564 // set_use_compressed_klass_ptrs() must be called after calling 1565 // set_use_compressed_oops(). 1566 set_use_compressed_klass_ptrs(); 1567 1568 // Also checks that certain machines are slower with compressed oops 1569 // in vm_version initialization code. 1570 #endif // _LP64 1571 1572 return JNI_OK; 1573 } 1574 1575 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1576 size_t max_allocatable; 1577 size_t result = limit; 1578 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1579 // The AggressiveHeap check is a temporary workaround to avoid calling 1580 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1581 // selected. This works because AggressiveHeap implies UseParallelGC 1582 // where we know the ratio will be 1. Once the AggressiveHeap option is 1583 // removed, this can be cleaned up. 1584 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1585 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1586 result = MIN2(result, max_allocatable / fraction); 1587 } 1588 return result; 1589 } 1590 1591 // Use static initialization to get the default before parsing 1592 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1593 1594 void Arguments::set_heap_size() { 1595 julong phys_mem; 1596 1597 // If the user specified one of these options, they 1598 // want specific memory sizing so do not limit memory 1599 // based on compressed oops addressability. 1600 // Also, memory limits will be calculated based on 1601 // available os physical memory, not our MaxRAM limit, 1602 // unless MaxRAM is also specified. 1603 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1604 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1605 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1606 !FLAG_IS_DEFAULT(MinRAMFraction) || 1607 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1608 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1609 !FLAG_IS_DEFAULT(MaxRAM)); 1610 if (override_coop_limit) { 1611 if (FLAG_IS_DEFAULT(MaxRAM)) { 1612 phys_mem = os::physical_memory(); 1613 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1614 } else { 1615 phys_mem = (julong)MaxRAM; 1616 } 1617 } else { 1618 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1619 : (julong)MaxRAM; 1620 } 1621 1622 1623 // Convert deprecated flags 1624 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1625 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1626 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1627 1628 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1629 !FLAG_IS_DEFAULT(MinRAMFraction)) 1630 MinRAMPercentage = 100.0 / MinRAMFraction; 1631 1632 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1633 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1634 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1635 1636 // If the maximum heap size has not been set with -Xmx, 1637 // then set it as fraction of the size of physical memory, 1638 // respecting the maximum and minimum sizes of the heap. 1639 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1640 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1641 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1642 if (reasonable_min < MaxHeapSize) { 1643 // Small physical memory, so use a minimum fraction of it for the heap 1644 reasonable_max = reasonable_min; 1645 } else { 1646 // Not-small physical memory, so require a heap at least 1647 // as large as MaxHeapSize 1648 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1649 } 1650 1651 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1652 // Limit the heap size to ErgoHeapSizeLimit 1653 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1654 } 1655 1656 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1657 1658 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1659 // An initial heap size was specified on the command line, 1660 // so be sure that the maximum size is consistent. Done 1661 // after call to limit_heap_by_allocatable_memory because that 1662 // method might reduce the allocation size. 1663 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1664 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1665 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1666 } 1667 1668 #ifdef _LP64 1669 if (UseCompressedOops || UseCompressedClassPointers) { 1670 // HeapBaseMinAddress can be greater than default but not less than. 1671 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1672 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1673 // matches compressed oops printing flags 1674 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1675 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1676 DefaultHeapBaseMinAddress, 1677 DefaultHeapBaseMinAddress/G, 1678 HeapBaseMinAddress); 1679 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1680 } 1681 } 1682 } 1683 if (UseCompressedOops) { 1684 // Limit the heap size to the maximum possible when using compressed oops 1685 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1686 1687 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1688 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1689 // but it should be not less than default MaxHeapSize. 1690 max_coop_heap -= HeapBaseMinAddress; 1691 } 1692 1693 // If user specified flags prioritizing os physical 1694 // memory limits, then disable compressed oops if 1695 // limits exceed max_coop_heap and UseCompressedOops 1696 // was not specified. 1697 if (reasonable_max > max_coop_heap) { 1698 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1699 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1700 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1701 "Please check the setting of MaxRAMPercentage %5.2f." 1702 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1703 FLAG_SET_ERGO(UseCompressedOops, false); 1704 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) { 1705 FLAG_SET_ERGO(UseCompressedClassPointers, false); 1706 } 1707 } else { 1708 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1709 } 1710 } 1711 } 1712 #endif // _LP64 1713 1714 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1715 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1716 } 1717 1718 // If the minimum or initial heap_size have not been set or requested to be set 1719 // ergonomically, set them accordingly. 1720 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1721 julong reasonable_minimum = (julong)(OldSize + NewSize); 1722 1723 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1724 1725 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1726 1727 if (InitialHeapSize == 0) { 1728 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1729 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1730 1731 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1732 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1733 1734 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1735 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1736 } 1737 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1738 // synchronize with InitialHeapSize to avoid errors with the default value. 1739 if (MinHeapSize == 0) { 1740 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1741 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1742 } 1743 } 1744 } 1745 1746 // This option inspects the machine and attempts to set various 1747 // parameters to be optimal for long-running, memory allocation 1748 // intensive jobs. It is intended for machines with large 1749 // amounts of cpu and memory. 1750 jint Arguments::set_aggressive_heap_flags() { 1751 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1752 // VM, but we may not be able to represent the total physical memory 1753 // available (like having 8gb of memory on a box but using a 32bit VM). 1754 // Thus, we need to make sure we're using a julong for intermediate 1755 // calculations. 1756 julong initHeapSize; 1757 julong total_memory = os::physical_memory(); 1758 1759 if (total_memory < (julong) 256 * M) { 1760 jio_fprintf(defaultStream::error_stream(), 1761 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1762 vm_exit(1); 1763 } 1764 1765 // The heap size is half of available memory, or (at most) 1766 // all of possible memory less 160mb (leaving room for the OS 1767 // when using ISM). This is the maximum; because adaptive sizing 1768 // is turned on below, the actual space used may be smaller. 1769 1770 initHeapSize = MIN2(total_memory / (julong) 2, 1771 total_memory - (julong) 160 * M); 1772 1773 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1774 1775 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1776 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1777 return JNI_EINVAL; 1778 } 1779 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1780 return JNI_EINVAL; 1781 } 1782 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1783 return JNI_EINVAL; 1784 } 1785 } 1786 if (FLAG_IS_DEFAULT(NewSize)) { 1787 // Make the young generation 3/8ths of the total heap. 1788 if (FLAG_SET_CMDLINE(NewSize, 1789 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1790 return JNI_EINVAL; 1791 } 1792 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1793 return JNI_EINVAL; 1794 } 1795 } 1796 1797 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1798 FLAG_SET_DEFAULT(UseLargePages, true); 1799 #endif 1800 1801 // Increase some data structure sizes for efficiency 1802 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1803 return JNI_EINVAL; 1804 } 1805 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1806 return JNI_EINVAL; 1807 } 1808 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1809 return JNI_EINVAL; 1810 } 1811 1812 // See the OldPLABSize comment below, but replace 'after promotion' 1813 // with 'after copying'. YoungPLABSize is the size of the survivor 1814 // space per-gc-thread buffers. The default is 4kw. 1815 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1816 return JNI_EINVAL; 1817 } 1818 1819 // OldPLABSize is the size of the buffers in the old gen that 1820 // UseParallelGC uses to promote live data that doesn't fit in the 1821 // survivor spaces. At any given time, there's one for each gc thread. 1822 // The default size is 1kw. These buffers are rarely used, since the 1823 // survivor spaces are usually big enough. For specjbb, however, there 1824 // are occasions when there's lots of live data in the young gen 1825 // and we end up promoting some of it. We don't have a definite 1826 // explanation for why bumping OldPLABSize helps, but the theory 1827 // is that a bigger PLAB results in retaining something like the 1828 // original allocation order after promotion, which improves mutator 1829 // locality. A minor effect may be that larger PLABs reduce the 1830 // number of PLAB allocation events during gc. The value of 8kw 1831 // was arrived at by experimenting with specjbb. 1832 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1833 return JNI_EINVAL; 1834 } 1835 1836 // Enable parallel GC and adaptive generation sizing 1837 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1838 return JNI_EINVAL; 1839 } 1840 1841 // Encourage steady state memory management 1842 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1843 return JNI_EINVAL; 1844 } 1845 1846 // This appears to improve mutator locality 1847 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1848 return JNI_EINVAL; 1849 } 1850 1851 return JNI_OK; 1852 } 1853 1854 // This must be called after ergonomics. 1855 void Arguments::set_bytecode_flags() { 1856 if (!RewriteBytecodes) { 1857 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1858 } 1859 } 1860 1861 // Aggressive optimization flags 1862 jint Arguments::set_aggressive_opts_flags() { 1863 #ifdef COMPILER2 1864 if (AggressiveUnboxing) { 1865 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1866 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1867 } else if (!EliminateAutoBox) { 1868 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1869 AggressiveUnboxing = false; 1870 } 1871 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1872 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1873 } else if (!DoEscapeAnalysis) { 1874 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1875 AggressiveUnboxing = false; 1876 } 1877 } 1878 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1879 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1880 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1881 } 1882 // Feed the cache size setting into the JDK 1883 char buffer[1024]; 1884 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1885 if (!add_property(buffer)) { 1886 return JNI_ENOMEM; 1887 } 1888 } 1889 #endif 1890 1891 return JNI_OK; 1892 } 1893 1894 //=========================================================================================================== 1895 // Parsing of java.compiler property 1896 1897 void Arguments::process_java_compiler_argument(const char* arg) { 1898 // For backwards compatibility, Djava.compiler=NONE or "" 1899 // causes us to switch to -Xint mode UNLESS -Xdebug 1900 // is also specified. 1901 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1902 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1903 } 1904 } 1905 1906 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1907 _sun_java_launcher = os::strdup_check_oom(launcher); 1908 } 1909 1910 bool Arguments::created_by_java_launcher() { 1911 assert(_sun_java_launcher != NULL, "property must have value"); 1912 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1913 } 1914 1915 bool Arguments::sun_java_launcher_is_altjvm() { 1916 return _sun_java_launcher_is_altjvm; 1917 } 1918 1919 //=========================================================================================================== 1920 // Parsing of main arguments 1921 1922 unsigned int addreads_count = 0; 1923 unsigned int addexports_count = 0; 1924 unsigned int addopens_count = 0; 1925 unsigned int addmods_count = 0; 1926 unsigned int patch_mod_count = 0; 1927 unsigned int enable_native_access_count = 0; 1928 1929 // Check the consistency of vm_init_args 1930 bool Arguments::check_vm_args_consistency() { 1931 // Method for adding checks for flag consistency. 1932 // The intent is to warn the user of all possible conflicts, 1933 // before returning an error. 1934 // Note: Needs platform-dependent factoring. 1935 bool status = true; 1936 1937 if (TLABRefillWasteFraction == 0) { 1938 jio_fprintf(defaultStream::error_stream(), 1939 "TLABRefillWasteFraction should be a denominator, " 1940 "not " SIZE_FORMAT "\n", 1941 TLABRefillWasteFraction); 1942 status = false; 1943 } 1944 1945 status = CompilerConfig::check_args_consistency(status); 1946 #if INCLUDE_JVMCI 1947 if (status && EnableJVMCI) { 1948 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 1949 AddProperty, UnwriteableProperty, InternalProperty); 1950 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) { 1951 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 1952 return false; 1953 } 1954 } 1955 } 1956 #endif 1957 1958 #if INCLUDE_JFR 1959 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1960 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) { 1961 return false; 1962 } 1963 } 1964 #endif 1965 1966 #ifndef SUPPORT_RESERVED_STACK_AREA 1967 if (StackReservedPages != 0) { 1968 FLAG_SET_CMDLINE(StackReservedPages, 0); 1969 warning("Reserved Stack Area not supported on this platform"); 1970 } 1971 #endif 1972 1973 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) 1974 if (UseHeavyMonitors) { 1975 jio_fprintf(defaultStream::error_stream(), 1976 "UseHeavyMonitors is not fully implemented on this architecture"); 1977 return false; 1978 } 1979 #endif 1980 #if (defined(X86) || defined(PPC64)) && !defined(ZERO) 1981 if (UseHeavyMonitors && UseRTMForStackLocks) { 1982 jio_fprintf(defaultStream::error_stream(), 1983 "-XX:+UseHeavyMonitors and -XX:+UseRTMForStackLocks are mutually exclusive"); 1984 1985 return false; 1986 } 1987 #endif 1988 if (VerifyHeavyMonitors && !UseHeavyMonitors) { 1989 jio_fprintf(defaultStream::error_stream(), 1990 "-XX:+VerifyHeavyMonitors requires -XX:+UseHeavyMonitors"); 1991 return false; 1992 } 1993 1994 return status; 1995 } 1996 1997 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1998 const char* option_type) { 1999 if (ignore) return false; 2000 2001 const char* spacer = " "; 2002 if (option_type == NULL) { 2003 option_type = ++spacer; // Set both to the empty string. 2004 } 2005 2006 jio_fprintf(defaultStream::error_stream(), 2007 "Unrecognized %s%soption: %s\n", option_type, spacer, 2008 option->optionString); 2009 return true; 2010 } 2011 2012 static const char* user_assertion_options[] = { 2013 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2014 }; 2015 2016 static const char* system_assertion_options[] = { 2017 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2018 }; 2019 2020 bool Arguments::parse_uintx(const char* value, 2021 uintx* uintx_arg, 2022 uintx min_size) { 2023 uintx n; 2024 if (!parse_integer(value, &n)) { 2025 return false; 2026 } 2027 if (n >= min_size) { 2028 *uintx_arg = n; 2029 return true; 2030 } else { 2031 return false; 2032 } 2033 } 2034 2035 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2036 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 2037 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2038 char* property = AllocateHeap(prop_len, mtArguments); 2039 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2040 if (ret < 0 || ret >= (int)prop_len) { 2041 FreeHeap(property); 2042 return false; 2043 } 2044 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 2045 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 2046 // that multiple occurrences of the associated flag just causes the existing property value to be 2047 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 2048 // to a property after we have finished flag processing. 2049 bool added = add_property(property, WriteableProperty, internal); 2050 FreeHeap(property); 2051 return added; 2052 } 2053 2054 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2055 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 2056 const unsigned int props_count_limit = 1000; 2057 const int max_digits = 3; 2058 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2059 2060 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2061 if (count < props_count_limit) { 2062 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2063 char* property = AllocateHeap(prop_len, mtArguments); 2064 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2065 if (ret < 0 || ret >= (int)prop_len) { 2066 FreeHeap(property); 2067 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2068 return false; 2069 } 2070 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2071 FreeHeap(property); 2072 return added; 2073 } 2074 2075 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2076 return false; 2077 } 2078 2079 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2080 julong* long_arg, 2081 julong min_size, 2082 julong max_size) { 2083 if (!parse_integer(s, long_arg)) return arg_unreadable; 2084 return check_memory_size(*long_arg, min_size, max_size); 2085 } 2086 2087 // Parse JavaVMInitArgs structure 2088 2089 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 2090 const JavaVMInitArgs *java_tool_options_args, 2091 const JavaVMInitArgs *java_options_args, 2092 const JavaVMInitArgs *cmd_line_args) { 2093 bool patch_mod_javabase = false; 2094 2095 // Save default settings for some mode flags 2096 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2097 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2098 Arguments::_ClipInlining = ClipInlining; 2099 Arguments::_BackgroundCompilation = BackgroundCompilation; 2100 2101 // Remember the default value of SharedBaseAddress. 2102 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 2103 2104 // Setup flags for mixed which is the default 2105 set_mode_flags(_mixed); 2106 2107 // Parse args structure generated from java.base vm options resource 2108 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE); 2109 if (result != JNI_OK) { 2110 return result; 2111 } 2112 2113 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2114 // variable (if present). 2115 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 2116 if (result != JNI_OK) { 2117 return result; 2118 } 2119 2120 // Parse args structure generated from the command line flags. 2121 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE); 2122 if (result != JNI_OK) { 2123 return result; 2124 } 2125 2126 // Parse args structure generated from the _JAVA_OPTIONS environment 2127 // variable (if present) (mimics classic VM) 2128 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 2129 if (result != JNI_OK) { 2130 return result; 2131 } 2132 2133 // We need to ensure processor and memory resources have been properly 2134 // configured - which may rely on arguments we just processed - before 2135 // doing the final argument processing. Any argument processing that 2136 // needs to know about processor and memory resources must occur after 2137 // this point. 2138 2139 os::init_container_support(); 2140 2141 // Do final processing now that all arguments have been parsed 2142 result = finalize_vm_init_args(patch_mod_javabase); 2143 if (result != JNI_OK) { 2144 return result; 2145 } 2146 2147 return JNI_OK; 2148 } 2149 2150 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2151 // represents a valid JDWP agent. is_path==true denotes that we 2152 // are dealing with -agentpath (case where name is a path), otherwise with 2153 // -agentlib 2154 bool valid_jdwp_agent(char *name, bool is_path) { 2155 char *_name; 2156 const char *_jdwp = "jdwp"; 2157 size_t _len_jdwp, _len_prefix; 2158 2159 if (is_path) { 2160 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2161 return false; 2162 } 2163 2164 _name++; // skip past last path separator 2165 _len_prefix = strlen(JNI_LIB_PREFIX); 2166 2167 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2168 return false; 2169 } 2170 2171 _name += _len_prefix; 2172 _len_jdwp = strlen(_jdwp); 2173 2174 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2175 _name += _len_jdwp; 2176 } 2177 else { 2178 return false; 2179 } 2180 2181 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2182 return false; 2183 } 2184 2185 return true; 2186 } 2187 2188 if (strcmp(name, _jdwp) == 0) { 2189 return true; 2190 } 2191 2192 return false; 2193 } 2194 2195 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2196 // --patch-module=<module>=<file>(<pathsep><file>)* 2197 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2198 // Find the equal sign between the module name and the path specification 2199 const char* module_equal = strchr(patch_mod_tail, '='); 2200 if (module_equal == NULL) { 2201 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2202 return JNI_ERR; 2203 } else { 2204 // Pick out the module name 2205 size_t module_len = module_equal - patch_mod_tail; 2206 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2207 if (module_name != NULL) { 2208 memcpy(module_name, patch_mod_tail, module_len); 2209 *(module_name + module_len) = '\0'; 2210 // The path piece begins one past the module_equal sign 2211 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2212 FREE_C_HEAP_ARRAY(char, module_name); 2213 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2214 return JNI_ENOMEM; 2215 } 2216 } else { 2217 return JNI_ENOMEM; 2218 } 2219 } 2220 return JNI_OK; 2221 } 2222 2223 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2224 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2225 // The min and max sizes match the values in globals.hpp, but scaled 2226 // with K. The values have been chosen so that alignment with page 2227 // size doesn't change the max value, which makes the conversions 2228 // back and forth between Xss value and ThreadStackSize value easier. 2229 // The values have also been chosen to fit inside a 32-bit signed type. 2230 const julong min_ThreadStackSize = 0; 2231 const julong max_ThreadStackSize = 1 * M; 2232 2233 // Make sure the above values match the range set in globals.hpp 2234 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2235 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2236 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2237 2238 const julong min_size = min_ThreadStackSize * K; 2239 const julong max_size = max_ThreadStackSize * K; 2240 2241 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2242 2243 julong size = 0; 2244 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2245 if (errcode != arg_in_range) { 2246 bool silent = (option == NULL); // Allow testing to silence error messages 2247 if (!silent) { 2248 jio_fprintf(defaultStream::error_stream(), 2249 "Invalid thread stack size: %s\n", option->optionString); 2250 describe_range_error(errcode); 2251 } 2252 return JNI_EINVAL; 2253 } 2254 2255 // Internally track ThreadStackSize in units of 1024 bytes. 2256 const julong size_aligned = align_up(size, K); 2257 assert(size <= size_aligned, 2258 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2259 size, size_aligned); 2260 2261 const julong size_in_K = size_aligned / K; 2262 assert(size_in_K < (julong)max_intx, 2263 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2264 size_in_K); 2265 2266 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2267 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2268 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2269 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2270 max_expanded, size_in_K); 2271 2272 *out_ThreadStackSize = (intx)size_in_K; 2273 2274 return JNI_OK; 2275 } 2276 2277 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) { 2278 // For match_option to return remaining or value part of option string 2279 const char* tail; 2280 2281 // iterate over arguments 2282 for (int index = 0; index < args->nOptions; index++) { 2283 bool is_absolute_path = false; // for -agentpath vs -agentlib 2284 2285 const JavaVMOption* option = args->options + index; 2286 2287 if (!match_option(option, "-Djava.class.path", &tail) && 2288 !match_option(option, "-Dsun.java.command", &tail) && 2289 !match_option(option, "-Dsun.java.launcher", &tail)) { 2290 2291 // add all jvm options to the jvm_args string. This string 2292 // is used later to set the java.vm.args PerfData string constant. 2293 // the -Djava.class.path and the -Dsun.java.command options are 2294 // omitted from jvm_args string as each have their own PerfData 2295 // string constant object. 2296 build_jvm_args(option->optionString); 2297 } 2298 2299 // -verbose:[class/module/gc/jni] 2300 if (match_option(option, "-verbose", &tail)) { 2301 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2302 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2303 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2304 } else if (!strcmp(tail, ":module")) { 2305 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2306 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2307 } else if (!strcmp(tail, ":gc")) { 2308 if (_legacyGCLogging.lastFlag == 0) { 2309 _legacyGCLogging.lastFlag = 1; 2310 } 2311 } else if (!strcmp(tail, ":jni")) { 2312 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2313 } 2314 // -da / -ea / -disableassertions / -enableassertions 2315 // These accept an optional class/package name separated by a colon, e.g., 2316 // -da:java.lang.Thread. 2317 } else if (match_option(option, user_assertion_options, &tail, true)) { 2318 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2319 if (*tail == '\0') { 2320 JavaAssertions::setUserClassDefault(enable); 2321 } else { 2322 assert(*tail == ':', "bogus match by match_option()"); 2323 JavaAssertions::addOption(tail + 1, enable); 2324 } 2325 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2326 } else if (match_option(option, system_assertion_options, &tail, false)) { 2327 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2328 JavaAssertions::setSystemClassDefault(enable); 2329 // -bootclasspath: 2330 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2331 jio_fprintf(defaultStream::output_stream(), 2332 "-Xbootclasspath is no longer a supported option.\n"); 2333 return JNI_EINVAL; 2334 // -bootclasspath/a: 2335 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2336 Arguments::append_sysclasspath(tail); 2337 #if INCLUDE_CDS 2338 MetaspaceShared::disable_optimized_module_handling(); 2339 log_info(cds)("optimized module handling: disabled because bootclasspath was appended"); 2340 #endif 2341 // -bootclasspath/p: 2342 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2343 jio_fprintf(defaultStream::output_stream(), 2344 "-Xbootclasspath/p is no longer a supported option.\n"); 2345 return JNI_EINVAL; 2346 // -Xrun 2347 } else if (match_option(option, "-Xrun", &tail)) { 2348 if (tail != NULL) { 2349 const char* pos = strchr(tail, ':'); 2350 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2351 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2352 jio_snprintf(name, len + 1, "%s", tail); 2353 2354 char *options = NULL; 2355 if(pos != NULL) { 2356 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2357 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2358 } 2359 #if !INCLUDE_JVMTI 2360 if (strcmp(name, "jdwp") == 0) { 2361 jio_fprintf(defaultStream::error_stream(), 2362 "Debugging agents are not supported in this VM\n"); 2363 return JNI_ERR; 2364 } 2365 #endif // !INCLUDE_JVMTI 2366 add_init_library(name, options); 2367 } 2368 } else if (match_option(option, "--add-reads=", &tail)) { 2369 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2370 return JNI_ENOMEM; 2371 } 2372 } else if (match_option(option, "--add-exports=", &tail)) { 2373 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2374 return JNI_ENOMEM; 2375 } 2376 } else if (match_option(option, "--add-opens=", &tail)) { 2377 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2378 return JNI_ENOMEM; 2379 } 2380 } else if (match_option(option, "--add-modules=", &tail)) { 2381 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2382 return JNI_ENOMEM; 2383 } 2384 } else if (match_option(option, "--enable-native-access=", &tail)) { 2385 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2386 return JNI_ENOMEM; 2387 } 2388 } else if (match_option(option, "--limit-modules=", &tail)) { 2389 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2390 return JNI_ENOMEM; 2391 } 2392 } else if (match_option(option, "--module-path=", &tail)) { 2393 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2394 return JNI_ENOMEM; 2395 } 2396 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2397 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2398 return JNI_ENOMEM; 2399 } 2400 } else if (match_option(option, "--patch-module=", &tail)) { 2401 // --patch-module=<module>=<file>(<pathsep><file>)* 2402 int res = process_patch_mod_option(tail, patch_mod_javabase); 2403 if (res != JNI_OK) { 2404 return res; 2405 } 2406 } else if (match_option(option, "--illegal-access=", &tail)) { 2407 char version[256]; 2408 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2409 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2410 // -agentlib and -agentpath 2411 } else if (match_option(option, "-agentlib:", &tail) || 2412 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2413 if(tail != NULL) { 2414 const char* pos = strchr(tail, '='); 2415 char* name; 2416 if (pos == NULL) { 2417 name = os::strdup_check_oom(tail, mtArguments); 2418 } else { 2419 size_t len = pos - tail; 2420 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2421 memcpy(name, tail, len); 2422 name[len] = '\0'; 2423 } 2424 2425 char *options = NULL; 2426 if(pos != NULL) { 2427 options = os::strdup_check_oom(pos + 1, mtArguments); 2428 } 2429 #if !INCLUDE_JVMTI 2430 if (valid_jdwp_agent(name, is_absolute_path)) { 2431 jio_fprintf(defaultStream::error_stream(), 2432 "Debugging agents are not supported in this VM\n"); 2433 return JNI_ERR; 2434 } 2435 #endif // !INCLUDE_JVMTI 2436 add_init_agent(name, options, is_absolute_path); 2437 } 2438 // -javaagent 2439 } else if (match_option(option, "-javaagent:", &tail)) { 2440 #if !INCLUDE_JVMTI 2441 jio_fprintf(defaultStream::error_stream(), 2442 "Instrumentation agents are not supported in this VM\n"); 2443 return JNI_ERR; 2444 #else 2445 if (tail != NULL) { 2446 size_t length = strlen(tail) + 1; 2447 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2448 jio_snprintf(options, length, "%s", tail); 2449 add_instrument_agent("instrument", options, false); 2450 // java agents need module java.instrument 2451 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2452 return JNI_ENOMEM; 2453 } 2454 } 2455 #endif // !INCLUDE_JVMTI 2456 // --enable_preview 2457 } else if (match_option(option, "--enable-preview")) { 2458 set_enable_preview(); 2459 // -Xnoclassgc 2460 } else if (match_option(option, "-Xnoclassgc")) { 2461 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2462 return JNI_EINVAL; 2463 } 2464 // -Xbatch 2465 } else if (match_option(option, "-Xbatch")) { 2466 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2467 return JNI_EINVAL; 2468 } 2469 // -Xmn for compatibility with other JVM vendors 2470 } else if (match_option(option, "-Xmn", &tail)) { 2471 julong long_initial_young_size = 0; 2472 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2473 if (errcode != arg_in_range) { 2474 jio_fprintf(defaultStream::error_stream(), 2475 "Invalid initial young generation size: %s\n", option->optionString); 2476 describe_range_error(errcode); 2477 return JNI_EINVAL; 2478 } 2479 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2480 return JNI_EINVAL; 2481 } 2482 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2483 return JNI_EINVAL; 2484 } 2485 // -Xms 2486 } else if (match_option(option, "-Xms", &tail)) { 2487 julong size = 0; 2488 // an initial heap size of 0 means automatically determine 2489 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2490 if (errcode != arg_in_range) { 2491 jio_fprintf(defaultStream::error_stream(), 2492 "Invalid initial heap size: %s\n", option->optionString); 2493 describe_range_error(errcode); 2494 return JNI_EINVAL; 2495 } 2496 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2497 return JNI_EINVAL; 2498 } 2499 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2500 return JNI_EINVAL; 2501 } 2502 // -Xmx 2503 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2504 julong long_max_heap_size = 0; 2505 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2506 if (errcode != arg_in_range) { 2507 jio_fprintf(defaultStream::error_stream(), 2508 "Invalid maximum heap size: %s\n", option->optionString); 2509 describe_range_error(errcode); 2510 return JNI_EINVAL; 2511 } 2512 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2513 return JNI_EINVAL; 2514 } 2515 // Xmaxf 2516 } else if (match_option(option, "-Xmaxf", &tail)) { 2517 char* err; 2518 int maxf = (int)(strtod(tail, &err) * 100); 2519 if (*err != '\0' || *tail == '\0') { 2520 jio_fprintf(defaultStream::error_stream(), 2521 "Bad max heap free percentage size: %s\n", 2522 option->optionString); 2523 return JNI_EINVAL; 2524 } else { 2525 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2526 return JNI_EINVAL; 2527 } 2528 } 2529 // Xminf 2530 } else if (match_option(option, "-Xminf", &tail)) { 2531 char* err; 2532 int minf = (int)(strtod(tail, &err) * 100); 2533 if (*err != '\0' || *tail == '\0') { 2534 jio_fprintf(defaultStream::error_stream(), 2535 "Bad min heap free percentage size: %s\n", 2536 option->optionString); 2537 return JNI_EINVAL; 2538 } else { 2539 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2540 return JNI_EINVAL; 2541 } 2542 } 2543 // -Xss 2544 } else if (match_option(option, "-Xss", &tail)) { 2545 intx value = 0; 2546 jint err = parse_xss(option, tail, &value); 2547 if (err != JNI_OK) { 2548 return err; 2549 } 2550 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2551 return JNI_EINVAL; 2552 } 2553 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2554 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2555 julong long_ReservedCodeCacheSize = 0; 2556 2557 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2558 if (errcode != arg_in_range) { 2559 jio_fprintf(defaultStream::error_stream(), 2560 "Invalid maximum code cache size: %s.\n", option->optionString); 2561 return JNI_EINVAL; 2562 } 2563 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2564 return JNI_EINVAL; 2565 } 2566 // -green 2567 } else if (match_option(option, "-green")) { 2568 jio_fprintf(defaultStream::error_stream(), 2569 "Green threads support not available\n"); 2570 return JNI_EINVAL; 2571 // -native 2572 } else if (match_option(option, "-native")) { 2573 // HotSpot always uses native threads, ignore silently for compatibility 2574 // -Xrs 2575 } else if (match_option(option, "-Xrs")) { 2576 // Classic/EVM option, new functionality 2577 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2578 return JNI_EINVAL; 2579 } 2580 // -Xprof 2581 } else if (match_option(option, "-Xprof")) { 2582 char version[256]; 2583 // Obsolete in JDK 10 2584 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2585 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2586 // -Xinternalversion 2587 } else if (match_option(option, "-Xinternalversion")) { 2588 jio_fprintf(defaultStream::output_stream(), "%s\n", 2589 VM_Version::internal_vm_info_string()); 2590 vm_exit(0); 2591 #ifndef PRODUCT 2592 // -Xprintflags 2593 } else if (match_option(option, "-Xprintflags")) { 2594 JVMFlag::printFlags(tty, false); 2595 vm_exit(0); 2596 #endif 2597 // -D 2598 } else if (match_option(option, "-D", &tail)) { 2599 const char* value; 2600 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2601 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2602 // abort if -Djava.endorsed.dirs is set 2603 jio_fprintf(defaultStream::output_stream(), 2604 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2605 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2606 return JNI_EINVAL; 2607 } 2608 if (match_option(option, "-Djava.ext.dirs=", &value) && 2609 *value != '\0' && strcmp(value, "\"\"") != 0) { 2610 // abort if -Djava.ext.dirs is set 2611 jio_fprintf(defaultStream::output_stream(), 2612 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2613 return JNI_EINVAL; 2614 } 2615 // Check for module related properties. They must be set using the modules 2616 // options. For example: use "--add-modules=java.sql", not 2617 // "-Djdk.module.addmods=java.sql" 2618 if (is_internal_module_property(option->optionString + 2)) { 2619 needs_module_property_warning = true; 2620 continue; 2621 } 2622 if (!add_property(tail)) { 2623 return JNI_ENOMEM; 2624 } 2625 // Out of the box management support 2626 if (match_option(option, "-Dcom.sun.management", &tail)) { 2627 #if INCLUDE_MANAGEMENT 2628 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2629 return JNI_EINVAL; 2630 } 2631 // management agent in module jdk.management.agent 2632 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2633 return JNI_ENOMEM; 2634 } 2635 #else 2636 jio_fprintf(defaultStream::output_stream(), 2637 "-Dcom.sun.management is not supported in this VM.\n"); 2638 return JNI_ERR; 2639 #endif 2640 } 2641 // -Xint 2642 } else if (match_option(option, "-Xint")) { 2643 set_mode_flags(_int); 2644 // -Xmixed 2645 } else if (match_option(option, "-Xmixed")) { 2646 set_mode_flags(_mixed); 2647 // -Xcomp 2648 } else if (match_option(option, "-Xcomp")) { 2649 // for testing the compiler; turn off all flags that inhibit compilation 2650 set_mode_flags(_comp); 2651 // -Xshare:dump 2652 } else if (match_option(option, "-Xshare:dump")) { 2653 DumpSharedSpaces = true; 2654 // -Xshare:on 2655 } else if (match_option(option, "-Xshare:on")) { 2656 UseSharedSpaces = true; 2657 RequireSharedSpaces = true; 2658 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2659 } else if (match_option(option, "-Xshare:auto")) { 2660 UseSharedSpaces = true; 2661 RequireSharedSpaces = false; 2662 xshare_auto_cmd_line = true; 2663 // -Xshare:off 2664 } else if (match_option(option, "-Xshare:off")) { 2665 UseSharedSpaces = false; 2666 RequireSharedSpaces = false; 2667 // -Xverify 2668 } else if (match_option(option, "-Xverify", &tail)) { 2669 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2670 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2671 return JNI_EINVAL; 2672 } 2673 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2674 return JNI_EINVAL; 2675 } 2676 } else if (strcmp(tail, ":remote") == 0) { 2677 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2678 return JNI_EINVAL; 2679 } 2680 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2681 return JNI_EINVAL; 2682 } 2683 } else if (strcmp(tail, ":none") == 0) { 2684 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2685 return JNI_EINVAL; 2686 } 2687 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2688 return JNI_EINVAL; 2689 } 2690 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2691 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2692 return JNI_EINVAL; 2693 } 2694 // -Xdebug 2695 } else if (match_option(option, "-Xdebug")) { 2696 // note this flag has been used, then ignore 2697 set_xdebug_mode(true); 2698 // -Xnoagent 2699 } else if (match_option(option, "-Xnoagent")) { 2700 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2701 } else if (match_option(option, "-Xloggc:", &tail)) { 2702 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2703 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2704 _legacyGCLogging.lastFlag = 2; 2705 _legacyGCLogging.file = os::strdup_check_oom(tail); 2706 } else if (match_option(option, "-Xlog", &tail)) { 2707 bool ret = false; 2708 if (strcmp(tail, ":help") == 0) { 2709 fileStream stream(defaultStream::output_stream()); 2710 LogConfiguration::print_command_line_help(&stream); 2711 vm_exit(0); 2712 } else if (strcmp(tail, ":disable") == 0) { 2713 LogConfiguration::disable_logging(); 2714 ret = true; 2715 } else if (strcmp(tail, ":async") == 0) { 2716 LogConfiguration::set_async_mode(true); 2717 ret = true; 2718 } else if (*tail == '\0') { 2719 ret = LogConfiguration::parse_command_line_arguments(); 2720 assert(ret, "-Xlog without arguments should never fail to parse"); 2721 } else if (*tail == ':') { 2722 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2723 } 2724 if (ret == false) { 2725 jio_fprintf(defaultStream::error_stream(), 2726 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2727 tail); 2728 return JNI_EINVAL; 2729 } 2730 // JNI hooks 2731 } else if (match_option(option, "-Xcheck", &tail)) { 2732 if (!strcmp(tail, ":jni")) { 2733 #if !INCLUDE_JNI_CHECK 2734 warning("JNI CHECKING is not supported in this VM"); 2735 #else 2736 CheckJNICalls = true; 2737 #endif // INCLUDE_JNI_CHECK 2738 } else if (is_bad_option(option, args->ignoreUnrecognized, 2739 "check")) { 2740 return JNI_EINVAL; 2741 } 2742 } else if (match_option(option, "vfprintf")) { 2743 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2744 } else if (match_option(option, "exit")) { 2745 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2746 } else if (match_option(option, "abort")) { 2747 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2748 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2749 // and the last option wins. 2750 } else if (match_option(option, "-XX:+NeverTenure")) { 2751 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2752 return JNI_EINVAL; 2753 } 2754 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2755 return JNI_EINVAL; 2756 } 2757 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2758 return JNI_EINVAL; 2759 } 2760 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2761 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2762 return JNI_EINVAL; 2763 } 2764 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2765 return JNI_EINVAL; 2766 } 2767 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2768 return JNI_EINVAL; 2769 } 2770 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2771 uintx max_tenuring_thresh = 0; 2772 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2773 jio_fprintf(defaultStream::error_stream(), 2774 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2775 return JNI_EINVAL; 2776 } 2777 2778 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2779 return JNI_EINVAL; 2780 } 2781 2782 if (MaxTenuringThreshold == 0) { 2783 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2784 return JNI_EINVAL; 2785 } 2786 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2787 return JNI_EINVAL; 2788 } 2789 } else { 2790 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2791 return JNI_EINVAL; 2792 } 2793 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2794 return JNI_EINVAL; 2795 } 2796 } 2797 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2798 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2799 return JNI_EINVAL; 2800 } 2801 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2802 return JNI_EINVAL; 2803 } 2804 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2805 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2806 return JNI_EINVAL; 2807 } 2808 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2809 return JNI_EINVAL; 2810 } 2811 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2812 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2813 return JNI_EINVAL; 2814 } 2815 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2816 return JNI_EINVAL; 2817 } 2818 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2819 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2820 return JNI_EINVAL; 2821 } 2822 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2823 return JNI_EINVAL; 2824 } 2825 } else if (match_option(option, "--finalization=", &tail)) { 2826 if (strcmp(tail, "enabled") == 0) { 2827 InstanceKlass::set_finalization_enabled(true); 2828 } else if (strcmp(tail, "disabled") == 0) { 2829 InstanceKlass::set_finalization_enabled(false); 2830 } else { 2831 jio_fprintf(defaultStream::error_stream(), 2832 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2833 tail); 2834 return JNI_EINVAL; 2835 } 2836 #if !defined(DTRACE_ENABLED) 2837 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2838 jio_fprintf(defaultStream::error_stream(), 2839 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2840 return JNI_EINVAL; 2841 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2842 jio_fprintf(defaultStream::error_stream(), 2843 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2844 return JNI_EINVAL; 2845 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2846 jio_fprintf(defaultStream::error_stream(), 2847 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2848 return JNI_EINVAL; 2849 #endif // !defined(DTRACE_ENABLED) 2850 #ifdef ASSERT 2851 } else if (match_option(option, "-XX:+FullGCALot")) { 2852 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2853 return JNI_EINVAL; 2854 } 2855 // disable scavenge before parallel mark-compact 2856 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2857 return JNI_EINVAL; 2858 } 2859 #endif 2860 #if !INCLUDE_MANAGEMENT 2861 } else if (match_option(option, "-XX:+ManagementServer")) { 2862 jio_fprintf(defaultStream::error_stream(), 2863 "ManagementServer is not supported in this VM.\n"); 2864 return JNI_ERR; 2865 #endif // INCLUDE_MANAGEMENT 2866 #if INCLUDE_JVMCI 2867 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) { 2868 if (EnableJVMCIProduct) { 2869 jio_fprintf(defaultStream::error_stream(), 2870 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n"); 2871 return JNI_EINVAL; 2872 } 2873 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) { 2874 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before 2875 if (EnableJVMCIProduct) { 2876 continue; 2877 } 2878 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2879 // Allow this flag if it has been unlocked. 2880 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) { 2881 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) { 2882 jio_fprintf(defaultStream::error_stream(), 2883 "Unable to enable JVMCI in product mode"); 2884 return JNI_ERR; 2885 } 2886 } 2887 // The flag was locked so process normally to report that error 2888 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2889 return JNI_EINVAL; 2890 } 2891 #endif // INCLUDE_JVMCI 2892 #if INCLUDE_JFR 2893 } else if (match_jfr_option(&option)) { 2894 return JNI_EINVAL; 2895 #endif 2896 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2897 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2898 // already been handled 2899 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2900 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2901 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2902 return JNI_EINVAL; 2903 } 2904 } 2905 // Unknown option 2906 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2907 return JNI_ERR; 2908 } 2909 } 2910 2911 // PrintSharedArchiveAndExit will turn on 2912 // -Xshare:on 2913 // -Xlog:class+path=info 2914 if (PrintSharedArchiveAndExit) { 2915 UseSharedSpaces = true; 2916 RequireSharedSpaces = true; 2917 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2918 } 2919 2920 fix_appclasspath(); 2921 2922 return JNI_OK; 2923 } 2924 2925 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 2926 // For java.base check for duplicate --patch-module options being specified on the command line. 2927 // This check is only required for java.base, all other duplicate module specifications 2928 // will be checked during module system initialization. The module system initialization 2929 // will throw an ExceptionInInitializerError if this situation occurs. 2930 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2931 if (*patch_mod_javabase) { 2932 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2933 } else { 2934 *patch_mod_javabase = true; 2935 } 2936 } 2937 2938 // Create GrowableArray lazily, only if --patch-module has been specified 2939 if (_patch_mod_prefix == NULL) { 2940 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2941 } 2942 2943 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2944 } 2945 2946 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2947 // 2948 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2949 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2950 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2951 // path is treated as the current directory. 2952 // 2953 // This causes problems with CDS, which requires that all directories specified in the classpath 2954 // must be empty. In most cases, applications do NOT want to load classes from the current 2955 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2956 // scripts compatible with CDS. 2957 void Arguments::fix_appclasspath() { 2958 if (IgnoreEmptyClassPaths) { 2959 const char separator = *os::path_separator(); 2960 const char* src = _java_class_path->value(); 2961 2962 // skip over all the leading empty paths 2963 while (*src == separator) { 2964 src ++; 2965 } 2966 2967 char* copy = os::strdup_check_oom(src, mtArguments); 2968 2969 // trim all trailing empty paths 2970 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 2971 *tail = '\0'; 2972 } 2973 2974 char from[3] = {separator, separator, '\0'}; 2975 char to [2] = {separator, '\0'}; 2976 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 2977 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 2978 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 2979 } 2980 2981 _java_class_path->set_writeable_value(copy); 2982 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 2983 } 2984 } 2985 2986 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 2987 // check if the default lib/endorsed directory exists; if so, error 2988 char path[JVM_MAXPATHLEN]; 2989 const char* fileSep = os::file_separator(); 2990 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 2991 2992 DIR* dir = os::opendir(path); 2993 if (dir != NULL) { 2994 jio_fprintf(defaultStream::output_stream(), 2995 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 2996 "in modular form will be supported via the concept of upgradeable modules.\n"); 2997 os::closedir(dir); 2998 return JNI_ERR; 2999 } 3000 3001 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3002 dir = os::opendir(path); 3003 if (dir != NULL) { 3004 jio_fprintf(defaultStream::output_stream(), 3005 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3006 "Use -classpath instead.\n."); 3007 os::closedir(dir); 3008 return JNI_ERR; 3009 } 3010 3011 // This must be done after all arguments have been processed 3012 // and the container support has been initialized since AggressiveHeap 3013 // relies on the amount of total memory available. 3014 if (AggressiveHeap) { 3015 jint result = set_aggressive_heap_flags(); 3016 if (result != JNI_OK) { 3017 return result; 3018 } 3019 } 3020 3021 // This must be done after all arguments have been processed. 3022 // java_compiler() true means set to "NONE" or empty. 3023 if (java_compiler() && !xdebug_mode()) { 3024 // For backwards compatibility, we switch to interpreted mode if 3025 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3026 // not specified. 3027 set_mode_flags(_int); 3028 } 3029 3030 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3031 // but like -Xint, leave compilation thresholds unaffected. 3032 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3033 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3034 set_mode_flags(_int); 3035 } 3036 3037 #ifdef ZERO 3038 // Zero always runs in interpreted mode 3039 set_mode_flags(_int); 3040 #endif 3041 3042 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3043 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3044 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3045 } 3046 3047 #if !COMPILER2_OR_JVMCI 3048 // Don't degrade server performance for footprint 3049 if (FLAG_IS_DEFAULT(UseLargePages) && 3050 MaxHeapSize < LargePageHeapSizeThreshold) { 3051 // No need for large granularity pages w/small heaps. 3052 // Note that large pages are enabled/disabled for both the 3053 // Java heap and the code cache. 3054 FLAG_SET_DEFAULT(UseLargePages, false); 3055 } 3056 3057 UNSUPPORTED_OPTION(ProfileInterpreter); 3058 #endif 3059 3060 // Parse the CompilationMode flag 3061 if (!CompilationModeFlag::initialize()) { 3062 return JNI_ERR; 3063 } 3064 3065 if (!check_vm_args_consistency()) { 3066 return JNI_ERR; 3067 } 3068 3069 #if INCLUDE_CDS 3070 if (DumpSharedSpaces) { 3071 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3072 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable 3073 // compiler just to be safe. 3074 // 3075 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the 3076 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler. 3077 // TODO: revisit the following for the static archive case. 3078 set_mode_flags(_int); 3079 } 3080 3081 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit 3082 if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) { 3083 jio_fprintf(defaultStream::output_stream(), 3084 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n"); 3085 return JNI_ERR; 3086 } 3087 3088 if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) { 3089 DynamicDumpSharedSpaces = false; 3090 } else { 3091 DynamicDumpSharedSpaces = true; 3092 } 3093 3094 if (AutoCreateSharedArchive) { 3095 if (SharedArchiveFile == NULL) { 3096 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile"); 3097 return JNI_ERR; 3098 } 3099 if (ArchiveClassesAtExit != NULL) { 3100 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit"); 3101 return JNI_ERR; 3102 } 3103 } 3104 3105 if (UseSharedSpaces && patch_mod_javabase) { 3106 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3107 } 3108 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3109 UseSharedSpaces = false; 3110 } 3111 3112 if (DumpSharedSpaces || DynamicDumpSharedSpaces) { 3113 // Always verify non-system classes during CDS dump 3114 if (!BytecodeVerificationRemote) { 3115 BytecodeVerificationRemote = true; 3116 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3117 } 3118 } 3119 #endif 3120 3121 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3122 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3123 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3124 3125 return JNI_OK; 3126 } 3127 3128 // Helper class for controlling the lifetime of JavaVMInitArgs 3129 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3130 // deleted on the destruction of the ScopedVMInitArgs object. 3131 class ScopedVMInitArgs : public StackObj { 3132 private: 3133 JavaVMInitArgs _args; 3134 char* _container_name; 3135 bool _is_set; 3136 char* _vm_options_file_arg; 3137 3138 public: 3139 ScopedVMInitArgs(const char *container_name) { 3140 _args.version = JNI_VERSION_1_2; 3141 _args.nOptions = 0; 3142 _args.options = NULL; 3143 _args.ignoreUnrecognized = false; 3144 _container_name = (char *)container_name; 3145 _is_set = false; 3146 _vm_options_file_arg = NULL; 3147 } 3148 3149 // Populates the JavaVMInitArgs object represented by this 3150 // ScopedVMInitArgs object with the arguments in options. The 3151 // allocated memory is deleted by the destructor. If this method 3152 // returns anything other than JNI_OK, then this object is in a 3153 // partially constructed state, and should be abandoned. 3154 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3155 _is_set = true; 3156 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3157 JavaVMOption, options->length(), mtArguments); 3158 if (options_arr == NULL) { 3159 return JNI_ENOMEM; 3160 } 3161 _args.options = options_arr; 3162 3163 for (int i = 0; i < options->length(); i++) { 3164 options_arr[i] = options->at(i); 3165 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3166 if (options_arr[i].optionString == NULL) { 3167 // Rely on the destructor to do cleanup. 3168 _args.nOptions = i; 3169 return JNI_ENOMEM; 3170 } 3171 } 3172 3173 _args.nOptions = options->length(); 3174 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3175 return JNI_OK; 3176 } 3177 3178 JavaVMInitArgs* get() { return &_args; } 3179 char* container_name() { return _container_name; } 3180 bool is_set() { return _is_set; } 3181 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3182 char* vm_options_file_arg() { return _vm_options_file_arg; } 3183 3184 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3185 if (_vm_options_file_arg != NULL) { 3186 os::free(_vm_options_file_arg); 3187 } 3188 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3189 } 3190 3191 ~ScopedVMInitArgs() { 3192 if (_vm_options_file_arg != NULL) { 3193 os::free(_vm_options_file_arg); 3194 } 3195 if (_args.options == NULL) return; 3196 for (int i = 0; i < _args.nOptions; i++) { 3197 os::free(_args.options[i].optionString); 3198 } 3199 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3200 } 3201 3202 // Insert options into this option list, to replace option at 3203 // vm_options_file_pos (-XX:VMOptionsFile) 3204 jint insert(const JavaVMInitArgs* args, 3205 const JavaVMInitArgs* args_to_insert, 3206 const int vm_options_file_pos) { 3207 assert(_args.options == NULL, "shouldn't be set yet"); 3208 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3209 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3210 3211 int length = args->nOptions + args_to_insert->nOptions - 1; 3212 // Construct new option array 3213 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3214 for (int i = 0; i < args->nOptions; i++) { 3215 if (i == vm_options_file_pos) { 3216 // insert the new options starting at the same place as the 3217 // -XX:VMOptionsFile option 3218 for (int j = 0; j < args_to_insert->nOptions; j++) { 3219 options.push(args_to_insert->options[j]); 3220 } 3221 } else { 3222 options.push(args->options[i]); 3223 } 3224 } 3225 // make into options array 3226 return set_args(&options); 3227 } 3228 }; 3229 3230 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3231 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3232 } 3233 3234 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3235 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3236 } 3237 3238 jint Arguments::parse_options_environment_variable(const char* name, 3239 ScopedVMInitArgs* vm_args) { 3240 char *buffer = ::getenv(name); 3241 3242 // Don't check this environment variable if user has special privileges 3243 // (e.g. unix su command). 3244 if (buffer == NULL || os::have_special_privileges()) { 3245 return JNI_OK; 3246 } 3247 3248 if ((buffer = os::strdup(buffer)) == NULL) { 3249 return JNI_ENOMEM; 3250 } 3251 3252 jio_fprintf(defaultStream::error_stream(), 3253 "Picked up %s: %s\n", name, buffer); 3254 3255 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3256 3257 os::free(buffer); 3258 return retcode; 3259 } 3260 3261 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3262 // read file into buffer 3263 int fd = ::open(file_name, O_RDONLY); 3264 if (fd < 0) { 3265 jio_fprintf(defaultStream::error_stream(), 3266 "Could not open options file '%s'\n", 3267 file_name); 3268 return JNI_ERR; 3269 } 3270 3271 struct stat stbuf; 3272 int retcode = os::stat(file_name, &stbuf); 3273 if (retcode != 0) { 3274 jio_fprintf(defaultStream::error_stream(), 3275 "Could not stat options file '%s'\n", 3276 file_name); 3277 ::close(fd); 3278 return JNI_ERR; 3279 } 3280 3281 if (stbuf.st_size == 0) { 3282 // tell caller there is no option data and that is ok 3283 ::close(fd); 3284 return JNI_OK; 3285 } 3286 3287 // '+ 1' for NULL termination even with max bytes 3288 size_t bytes_alloc = stbuf.st_size + 1; 3289 3290 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3291 if (NULL == buf) { 3292 jio_fprintf(defaultStream::error_stream(), 3293 "Could not allocate read buffer for options file parse\n"); 3294 ::close(fd); 3295 return JNI_ENOMEM; 3296 } 3297 3298 memset(buf, 0, bytes_alloc); 3299 3300 // Fill buffer 3301 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3302 ::close(fd); 3303 if (bytes_read < 0) { 3304 FREE_C_HEAP_ARRAY(char, buf); 3305 jio_fprintf(defaultStream::error_stream(), 3306 "Could not read options file '%s'\n", file_name); 3307 return JNI_ERR; 3308 } 3309 3310 if (bytes_read == 0) { 3311 // tell caller there is no option data and that is ok 3312 FREE_C_HEAP_ARRAY(char, buf); 3313 return JNI_OK; 3314 } 3315 3316 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3317 3318 FREE_C_HEAP_ARRAY(char, buf); 3319 return retcode; 3320 } 3321 3322 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3323 // Construct option array 3324 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3325 3326 // some pointers to help with parsing 3327 char *buffer_end = buffer + buf_len; 3328 char *opt_hd = buffer; 3329 char *wrt = buffer; 3330 char *rd = buffer; 3331 3332 // parse all options 3333 while (rd < buffer_end) { 3334 // skip leading white space from the input string 3335 while (rd < buffer_end && isspace(*rd)) { 3336 rd++; 3337 } 3338 3339 if (rd >= buffer_end) { 3340 break; 3341 } 3342 3343 // Remember this is where we found the head of the token. 3344 opt_hd = wrt; 3345 3346 // Tokens are strings of non white space characters separated 3347 // by one or more white spaces. 3348 while (rd < buffer_end && !isspace(*rd)) { 3349 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3350 int quote = *rd; // matching quote to look for 3351 rd++; // don't copy open quote 3352 while (rd < buffer_end && *rd != quote) { 3353 // include everything (even spaces) 3354 // up until the close quote 3355 *wrt++ = *rd++; // copy to option string 3356 } 3357 3358 if (rd < buffer_end) { 3359 rd++; // don't copy close quote 3360 } else { 3361 // did not see closing quote 3362 jio_fprintf(defaultStream::error_stream(), 3363 "Unmatched quote in %s\n", name); 3364 return JNI_ERR; 3365 } 3366 } else { 3367 *wrt++ = *rd++; // copy to option string 3368 } 3369 } 3370 3371 // steal a white space character and set it to NULL 3372 *wrt++ = '\0'; 3373 // We now have a complete token 3374 3375 JavaVMOption option; 3376 option.optionString = opt_hd; 3377 option.extraInfo = NULL; 3378 3379 options.append(option); // Fill in option 3380 3381 rd++; // Advance to next character 3382 } 3383 3384 // Fill out JavaVMInitArgs structure. 3385 return vm_args->set_args(&options); 3386 } 3387 3388 void Arguments::set_shared_spaces_flags_and_archive_paths() { 3389 if (DumpSharedSpaces) { 3390 if (RequireSharedSpaces) { 3391 warning("Cannot dump shared archive while using shared archive"); 3392 } 3393 UseSharedSpaces = false; 3394 } 3395 #if INCLUDE_CDS 3396 // Initialize shared archive paths which could include both base and dynamic archive paths 3397 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly. 3398 // 3399 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid. 3400 if (DumpSharedSpaces || UseSharedSpaces) { 3401 init_shared_archive_paths(); 3402 } 3403 #endif // INCLUDE_CDS 3404 } 3405 3406 #if INCLUDE_CDS 3407 // Sharing support 3408 // Construct the path to the archive 3409 char* Arguments::get_default_shared_archive_path() { 3410 char *default_archive_path; 3411 char jvm_path[JVM_MAXPATHLEN]; 3412 os::jvm_path(jvm_path, sizeof(jvm_path)); 3413 char *end = strrchr(jvm_path, *os::file_separator()); 3414 if (end != NULL) *end = '\0'; 3415 size_t jvm_path_len = strlen(jvm_path); 3416 size_t file_sep_len = strlen(os::file_separator()); 3417 const size_t len = jvm_path_len + file_sep_len + 20; 3418 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3419 jio_snprintf(default_archive_path, len, 3420 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa", 3421 jvm_path, os::file_separator()); 3422 return default_archive_path; 3423 } 3424 3425 int Arguments::num_archives(const char* archive_path) { 3426 if (archive_path == NULL) { 3427 return 0; 3428 } 3429 int npaths = 1; 3430 char* p = (char*)archive_path; 3431 while (*p != '\0') { 3432 if (*p == os::path_separator()[0]) { 3433 npaths++; 3434 } 3435 p++; 3436 } 3437 return npaths; 3438 } 3439 3440 void Arguments::extract_shared_archive_paths(const char* archive_path, 3441 char** base_archive_path, 3442 char** top_archive_path) { 3443 char* begin_ptr = (char*)archive_path; 3444 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3445 if (end_ptr == NULL || end_ptr == begin_ptr) { 3446 vm_exit_during_initialization("Base archive was not specified", archive_path); 3447 } 3448 size_t len = end_ptr - begin_ptr; 3449 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3450 strncpy(cur_path, begin_ptr, len); 3451 cur_path[len] = '\0'; 3452 *base_archive_path = cur_path; 3453 3454 begin_ptr = ++end_ptr; 3455 if (*begin_ptr == '\0') { 3456 vm_exit_during_initialization("Top archive was not specified", archive_path); 3457 } 3458 end_ptr = strchr(begin_ptr, '\0'); 3459 assert(end_ptr != NULL, "sanity"); 3460 len = end_ptr - begin_ptr; 3461 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3462 strncpy(cur_path, begin_ptr, len + 1); 3463 *top_archive_path = cur_path; 3464 } 3465 3466 void Arguments::init_shared_archive_paths() { 3467 if (ArchiveClassesAtExit != nullptr) { 3468 assert(!RecordDynamicDumpInfo, "already checked"); 3469 if (DumpSharedSpaces) { 3470 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3471 } 3472 check_unsupported_dumping_properties(); 3473 3474 if (os::same_files((const char*)get_default_shared_archive_path(), ArchiveClassesAtExit)) { 3475 vm_exit_during_initialization( 3476 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path()); 3477 } 3478 } 3479 3480 if (SharedArchiveFile == nullptr) { 3481 SharedArchivePath = get_default_shared_archive_path(); 3482 } else { 3483 int archives = num_archives(SharedArchiveFile); 3484 assert(archives > 0, "must be"); 3485 3486 if (is_dumping_archive() && archives > 1) { 3487 vm_exit_during_initialization( 3488 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3489 } 3490 3491 if (DumpSharedSpaces) { 3492 assert(archives == 1, "must be"); 3493 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file 3494 // will be overwritten no matter regardless of its contents 3495 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3496 } else { 3497 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa 3498 // is read from top.jsa 3499 // (a) 1 file: -XX:SharedArchiveFile=base.jsa 3500 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa 3501 // (c) 2 files: -XX:SharedArchiveFile=top.jsa 3502 // 3503 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not 3504 // allow cases (b) and (c). Case (b) is already checked above. 3505 3506 if (archives > 2) { 3507 vm_exit_during_initialization( 3508 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3509 } 3510 if (archives == 1) { 3511 char* base_archive_path = NULL; 3512 bool success = 3513 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path); 3514 if (!success) { 3515 // If +AutoCreateSharedArchive and the specified shared archive does not exist, 3516 // regenerate the dynamic archive base on default archive. 3517 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) { 3518 DynamicDumpSharedSpaces = true; 3519 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile); 3520 SharedArchivePath = get_default_shared_archive_path(); 3521 SharedArchiveFile = nullptr; 3522 } else { 3523 if (AutoCreateSharedArchive) { 3524 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info."); 3525 AutoCreateSharedArchive = false; 3526 } 3527 no_shared_spaces("invalid archive"); 3528 } 3529 } else if (base_archive_path == NULL) { 3530 // User has specified a single archive, which is a static archive. 3531 SharedArchivePath = const_cast<char *>(SharedArchiveFile); 3532 } else { 3533 // User has specified a single archive, which is a dynamic archive. 3534 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile); 3535 SharedArchivePath = base_archive_path; // has been c-heap allocated. 3536 } 3537 } else { 3538 extract_shared_archive_paths((const char*)SharedArchiveFile, 3539 &SharedArchivePath, &SharedDynamicArchivePath); 3540 if (SharedArchivePath == NULL) { 3541 assert(SharedDynamicArchivePath == NULL, "must be"); 3542 no_shared_spaces("invalid archive"); 3543 } 3544 } 3545 3546 if (SharedDynamicArchivePath != nullptr) { 3547 // Check for case (c) 3548 if (RecordDynamicDumpInfo) { 3549 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3550 SharedArchiveFile); 3551 } 3552 if (ArchiveClassesAtExit != nullptr) { 3553 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3554 SharedArchiveFile); 3555 } 3556 } 3557 3558 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3559 vm_exit_during_initialization( 3560 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3561 SharedArchiveFile); 3562 } 3563 } 3564 } 3565 } 3566 #endif // INCLUDE_CDS 3567 3568 #ifndef PRODUCT 3569 // Determine whether LogVMOutput should be implicitly turned on. 3570 static bool use_vm_log() { 3571 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3572 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3573 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3574 PrintAssembly || TraceDeoptimization || TraceDependencies || 3575 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3576 return true; 3577 } 3578 3579 #ifdef COMPILER1 3580 if (PrintC1Statistics) { 3581 return true; 3582 } 3583 #endif // COMPILER1 3584 3585 #ifdef COMPILER2 3586 if (PrintOptoAssembly || PrintOptoStatistics) { 3587 return true; 3588 } 3589 #endif // COMPILER2 3590 3591 return false; 3592 } 3593 3594 #endif // PRODUCT 3595 3596 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3597 for (int index = 0; index < args->nOptions; index++) { 3598 const JavaVMOption* option = args->options + index; 3599 const char* tail; 3600 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3601 return true; 3602 } 3603 } 3604 return false; 3605 } 3606 3607 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3608 const char* vm_options_file, 3609 const int vm_options_file_pos, 3610 ScopedVMInitArgs* vm_options_file_args, 3611 ScopedVMInitArgs* args_out) { 3612 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3613 if (code != JNI_OK) { 3614 return code; 3615 } 3616 3617 if (vm_options_file_args->get()->nOptions < 1) { 3618 return JNI_OK; 3619 } 3620 3621 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3622 jio_fprintf(defaultStream::error_stream(), 3623 "A VM options file may not refer to a VM options file. " 3624 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3625 "options file '%s' in options container '%s' is an error.\n", 3626 vm_options_file_args->vm_options_file_arg(), 3627 vm_options_file_args->container_name()); 3628 return JNI_EINVAL; 3629 } 3630 3631 return args_out->insert(args, vm_options_file_args->get(), 3632 vm_options_file_pos); 3633 } 3634 3635 // Expand -XX:VMOptionsFile found in args_in as needed. 3636 // mod_args and args_out parameters may return values as needed. 3637 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3638 ScopedVMInitArgs* mod_args, 3639 JavaVMInitArgs** args_out) { 3640 jint code = match_special_option_and_act(args_in, mod_args); 3641 if (code != JNI_OK) { 3642 return code; 3643 } 3644 3645 if (mod_args->is_set()) { 3646 // args_in contains -XX:VMOptionsFile and mod_args contains the 3647 // original options from args_in along with the options expanded 3648 // from the VMOptionsFile. Return a short-hand to the caller. 3649 *args_out = mod_args->get(); 3650 } else { 3651 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3652 } 3653 return JNI_OK; 3654 } 3655 3656 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3657 ScopedVMInitArgs* args_out) { 3658 // Remaining part of option string 3659 const char* tail; 3660 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3661 3662 for (int index = 0; index < args->nOptions; index++) { 3663 const JavaVMOption* option = args->options + index; 3664 if (match_option(option, "-XX:Flags=", &tail)) { 3665 Arguments::set_jvm_flags_file(tail); 3666 continue; 3667 } 3668 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3669 if (vm_options_file_args.found_vm_options_file_arg()) { 3670 jio_fprintf(defaultStream::error_stream(), 3671 "The option '%s' is already specified in the options " 3672 "container '%s' so the specification of '%s' in the " 3673 "same options container is an error.\n", 3674 vm_options_file_args.vm_options_file_arg(), 3675 vm_options_file_args.container_name(), 3676 option->optionString); 3677 return JNI_EINVAL; 3678 } 3679 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3680 // If there's a VMOptionsFile, parse that 3681 jint code = insert_vm_options_file(args, tail, index, 3682 &vm_options_file_args, args_out); 3683 if (code != JNI_OK) { 3684 return code; 3685 } 3686 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3687 if (args_out->is_set()) { 3688 // The VMOptions file inserted some options so switch 'args' 3689 // to the new set of options, and continue processing which 3690 // preserves "last option wins" semantics. 3691 args = args_out->get(); 3692 // The first option from the VMOptionsFile replaces the 3693 // current option. So we back track to process the 3694 // replacement option. 3695 index--; 3696 } 3697 continue; 3698 } 3699 if (match_option(option, "-XX:+PrintVMOptions")) { 3700 PrintVMOptions = true; 3701 continue; 3702 } 3703 if (match_option(option, "-XX:-PrintVMOptions")) { 3704 PrintVMOptions = false; 3705 continue; 3706 } 3707 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3708 IgnoreUnrecognizedVMOptions = true; 3709 continue; 3710 } 3711 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3712 IgnoreUnrecognizedVMOptions = false; 3713 continue; 3714 } 3715 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3716 JVMFlag::printFlags(tty, false); 3717 vm_exit(0); 3718 } 3719 3720 #ifndef PRODUCT 3721 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3722 JVMFlag::printFlags(tty, true); 3723 vm_exit(0); 3724 } 3725 #endif 3726 } 3727 return JNI_OK; 3728 } 3729 3730 static void print_options(const JavaVMInitArgs *args) { 3731 const char* tail; 3732 for (int index = 0; index < args->nOptions; index++) { 3733 const JavaVMOption *option = args->options + index; 3734 if (match_option(option, "-XX:", &tail)) { 3735 logOption(tail); 3736 } 3737 } 3738 } 3739 3740 bool Arguments::handle_deprecated_print_gc_flags() { 3741 if (PrintGC) { 3742 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3743 } 3744 if (PrintGCDetails) { 3745 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3746 } 3747 3748 if (_legacyGCLogging.lastFlag == 2) { 3749 // -Xloggc was used to specify a filename 3750 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3751 3752 LogTarget(Error, logging) target; 3753 LogStream errstream(target); 3754 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, NULL, &errstream); 3755 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3756 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3757 } 3758 return true; 3759 } 3760 3761 static void apply_debugger_ergo() { 3762 #ifndef PRODUCT 3763 // UseDebuggerErgo is notproduct 3764 if (ReplayCompiles) { 3765 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3766 } 3767 #endif 3768 3769 #ifndef PRODUCT 3770 if (UseDebuggerErgo) { 3771 // Turn on sub-flags 3772 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3773 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3774 } 3775 #endif 3776 3777 if (UseDebuggerErgo2) { 3778 // Debugging with limited number of CPUs 3779 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3780 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3781 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3782 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3783 } 3784 } 3785 3786 // Parse entry point called from JNI_CreateJavaVM 3787 3788 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3789 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3790 JVMFlag::check_all_flag_declarations(); 3791 3792 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3793 const char* hotspotrc = ".hotspotrc"; 3794 bool settings_file_specified = false; 3795 bool needs_hotspotrc_warning = false; 3796 ScopedVMInitArgs initial_vm_options_args(""); 3797 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3798 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3799 3800 // Pointers to current working set of containers 3801 JavaVMInitArgs* cur_cmd_args; 3802 JavaVMInitArgs* cur_vm_options_args; 3803 JavaVMInitArgs* cur_java_options_args; 3804 JavaVMInitArgs* cur_java_tool_options_args; 3805 3806 // Containers for modified/expanded options 3807 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3808 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3809 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3810 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3811 3812 3813 jint code = 3814 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3815 if (code != JNI_OK) { 3816 return code; 3817 } 3818 3819 code = parse_java_options_environment_variable(&initial_java_options_args); 3820 if (code != JNI_OK) { 3821 return code; 3822 } 3823 3824 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3825 char *vmoptions = ClassLoader::lookup_vm_options(); 3826 if (vmoptions != NULL) { 3827 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3828 FREE_C_HEAP_ARRAY(char, vmoptions); 3829 if (code != JNI_OK) { 3830 return code; 3831 } 3832 } 3833 3834 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3835 &mod_java_tool_options_args, 3836 &cur_java_tool_options_args); 3837 if (code != JNI_OK) { 3838 return code; 3839 } 3840 3841 code = expand_vm_options_as_needed(initial_cmd_args, 3842 &mod_cmd_args, 3843 &cur_cmd_args); 3844 if (code != JNI_OK) { 3845 return code; 3846 } 3847 3848 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3849 &mod_java_options_args, 3850 &cur_java_options_args); 3851 if (code != JNI_OK) { 3852 return code; 3853 } 3854 3855 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3856 &mod_vm_options_args, 3857 &cur_vm_options_args); 3858 if (code != JNI_OK) { 3859 return code; 3860 } 3861 3862 const char* flags_file = Arguments::get_jvm_flags_file(); 3863 settings_file_specified = (flags_file != NULL); 3864 3865 if (IgnoreUnrecognizedVMOptions) { 3866 cur_cmd_args->ignoreUnrecognized = true; 3867 cur_java_tool_options_args->ignoreUnrecognized = true; 3868 cur_java_options_args->ignoreUnrecognized = true; 3869 } 3870 3871 // Parse specified settings file 3872 if (settings_file_specified) { 3873 if (!process_settings_file(flags_file, true, 3874 cur_cmd_args->ignoreUnrecognized)) { 3875 return JNI_EINVAL; 3876 } 3877 } else { 3878 #ifdef ASSERT 3879 // Parse default .hotspotrc settings file 3880 if (!process_settings_file(".hotspotrc", false, 3881 cur_cmd_args->ignoreUnrecognized)) { 3882 return JNI_EINVAL; 3883 } 3884 #else 3885 struct stat buf; 3886 if (os::stat(hotspotrc, &buf) == 0) { 3887 needs_hotspotrc_warning = true; 3888 } 3889 #endif 3890 } 3891 3892 if (PrintVMOptions) { 3893 print_options(cur_java_tool_options_args); 3894 print_options(cur_cmd_args); 3895 print_options(cur_java_options_args); 3896 } 3897 3898 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3899 jint result = parse_vm_init_args(cur_vm_options_args, 3900 cur_java_tool_options_args, 3901 cur_java_options_args, 3902 cur_cmd_args); 3903 3904 if (result != JNI_OK) { 3905 return result; 3906 } 3907 3908 // Delay warning until here so that we've had a chance to process 3909 // the -XX:-PrintWarnings flag 3910 if (needs_hotspotrc_warning) { 3911 warning("%s file is present but has been ignored. " 3912 "Run with -XX:Flags=%s to load the file.", 3913 hotspotrc, hotspotrc); 3914 } 3915 3916 if (needs_module_property_warning) { 3917 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3918 " names that are reserved for internal use."); 3919 } 3920 3921 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3922 UNSUPPORTED_OPTION(UseLargePages); 3923 #endif 3924 3925 #if defined(AIX) 3926 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3927 #endif 3928 3929 #ifndef PRODUCT 3930 if (TraceBytecodesAt != 0) { 3931 TraceBytecodes = true; 3932 } 3933 if (CountCompiledCalls) { 3934 if (UseCounterDecay) { 3935 warning("UseCounterDecay disabled because CountCalls is set"); 3936 UseCounterDecay = false; 3937 } 3938 } 3939 #endif // PRODUCT 3940 3941 if (ScavengeRootsInCode == 0) { 3942 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3943 warning("Forcing ScavengeRootsInCode non-zero"); 3944 } 3945 ScavengeRootsInCode = 1; 3946 } 3947 3948 if (!handle_deprecated_print_gc_flags()) { 3949 return JNI_EINVAL; 3950 } 3951 3952 // Set object alignment values. 3953 set_object_alignment(); 3954 3955 #if !INCLUDE_CDS 3956 if (DumpSharedSpaces || RequireSharedSpaces) { 3957 jio_fprintf(defaultStream::error_stream(), 3958 "Shared spaces are not supported in this VM\n"); 3959 return JNI_ERR; 3960 } 3961 if (DumpLoadedClassList != NULL) { 3962 jio_fprintf(defaultStream::error_stream(), 3963 "DumpLoadedClassList is not supported in this VM\n"); 3964 return JNI_ERR; 3965 } 3966 if ((UseSharedSpaces && xshare_auto_cmd_line) || 3967 log_is_enabled(Info, cds)) { 3968 warning("Shared spaces are not supported in this VM"); 3969 UseSharedSpaces = false; 3970 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3971 } 3972 no_shared_spaces("CDS Disabled"); 3973 #endif // INCLUDE_CDS 3974 3975 // Verify NMT arguments 3976 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 3977 if (lvl == NMT_unknown) { 3978 jio_fprintf(defaultStream::error_stream(), 3979 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3980 return JNI_ERR; 3981 } 3982 if (PrintNMTStatistics && lvl == NMT_off) { 3983 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 3984 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 3985 } 3986 3987 if (TraceDependencies && VerifyDependencies) { 3988 if (!FLAG_IS_DEFAULT(TraceDependencies)) { 3989 warning("TraceDependencies results may be inflated by VerifyDependencies"); 3990 } 3991 } 3992 3993 apply_debugger_ergo(); 3994 3995 if (log_is_enabled(Info, arguments)) { 3996 LogStream st(Log(arguments)::info()); 3997 Arguments::print_on(&st); 3998 } 3999 4000 return JNI_OK; 4001 } 4002 4003 jint Arguments::apply_ergo() { 4004 // Set flags based on ergonomics. 4005 jint result = set_ergonomics_flags(); 4006 if (result != JNI_OK) return result; 4007 4008 // Set heap size based on available physical memory 4009 set_heap_size(); 4010 4011 GCConfig::arguments()->initialize(); 4012 4013 set_shared_spaces_flags_and_archive_paths(); 4014 4015 // Initialize Metaspace flags and alignments 4016 Metaspace::ergo_initialize(); 4017 4018 if (!StringDedup::ergo_initialize()) { 4019 return JNI_EINVAL; 4020 } 4021 4022 // Set compiler flags after GC is selected and GC specific 4023 // flags (LoopStripMiningIter) are set. 4024 CompilerConfig::ergo_initialize(); 4025 4026 // Set bytecode rewriting flags 4027 set_bytecode_flags(); 4028 4029 // Set flags if aggressive optimization flags are enabled 4030 jint code = set_aggressive_opts_flags(); 4031 if (code != JNI_OK) { 4032 return code; 4033 } 4034 4035 #ifdef ZERO 4036 // Clear flags not supported on zero. 4037 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4038 #endif // ZERO 4039 4040 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4041 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4042 DebugNonSafepoints = true; 4043 } 4044 4045 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4046 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4047 } 4048 4049 // Treat the odd case where local verification is enabled but remote 4050 // verification is not as if both were enabled. 4051 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4052 log_info(verification)("Turning on remote verification because local verification is on"); 4053 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4054 } 4055 4056 #ifndef PRODUCT 4057 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4058 if (use_vm_log()) { 4059 LogVMOutput = true; 4060 } 4061 } 4062 #endif // PRODUCT 4063 4064 if (PrintCommandLineFlags) { 4065 JVMFlag::printSetFlags(tty); 4066 } 4067 4068 #ifdef COMPILER2 4069 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 4070 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 4071 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 4072 } 4073 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 4074 4075 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 4076 if (!EnableVectorReboxing) { 4077 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 4078 } else { 4079 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 4080 } 4081 } 4082 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 4083 4084 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 4085 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 4086 } 4087 FLAG_SET_DEFAULT(UseVectorStubs, false); 4088 } 4089 #endif // COMPILER2 4090 4091 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 4092 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 4093 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 4094 } 4095 } 4096 return JNI_OK; 4097 } 4098 4099 jint Arguments::adjust_after_os() { 4100 if (UseNUMA) { 4101 if (UseParallelGC) { 4102 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4103 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4104 } 4105 } 4106 } 4107 return JNI_OK; 4108 } 4109 4110 int Arguments::PropertyList_count(SystemProperty* pl) { 4111 int count = 0; 4112 while(pl != NULL) { 4113 count++; 4114 pl = pl->next(); 4115 } 4116 return count; 4117 } 4118 4119 // Return the number of readable properties. 4120 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4121 int count = 0; 4122 while(pl != NULL) { 4123 if (pl->readable()) { 4124 count++; 4125 } 4126 pl = pl->next(); 4127 } 4128 return count; 4129 } 4130 4131 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4132 assert(key != NULL, "just checking"); 4133 SystemProperty* prop; 4134 for (prop = pl; prop != NULL; prop = prop->next()) { 4135 if (strcmp(key, prop->key()) == 0) return prop->value(); 4136 } 4137 return NULL; 4138 } 4139 4140 // Return the value of the requested property provided that it is a readable property. 4141 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4142 assert(key != NULL, "just checking"); 4143 SystemProperty* prop; 4144 // Return the property value if the keys match and the property is not internal or 4145 // it's the special internal property "jdk.boot.class.path.append". 4146 for (prop = pl; prop != NULL; prop = prop->next()) { 4147 if (strcmp(key, prop->key()) == 0) { 4148 if (!prop->internal()) { 4149 return prop->value(); 4150 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4151 return prop->value(); 4152 } else { 4153 // Property is internal and not jdk.boot.class.path.append so return NULL. 4154 return NULL; 4155 } 4156 } 4157 } 4158 return NULL; 4159 } 4160 4161 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4162 SystemProperty* p = *plist; 4163 if (p == NULL) { 4164 *plist = new_p; 4165 } else { 4166 while (p->next() != NULL) { 4167 p = p->next(); 4168 } 4169 p->set_next(new_p); 4170 } 4171 } 4172 4173 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4174 bool writeable, bool internal) { 4175 if (plist == NULL) 4176 return; 4177 4178 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4179 PropertyList_add(plist, new_p); 4180 } 4181 4182 void Arguments::PropertyList_add(SystemProperty *element) { 4183 PropertyList_add(&_system_properties, element); 4184 } 4185 4186 // This add maintains unique property key in the list. 4187 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4188 PropertyAppendable append, PropertyWriteable writeable, 4189 PropertyInternal internal) { 4190 if (plist == NULL) 4191 return; 4192 4193 // If property key exists and is writeable, then update with new value. 4194 // Trying to update a non-writeable property is silently ignored. 4195 SystemProperty* prop; 4196 for (prop = *plist; prop != NULL; prop = prop->next()) { 4197 if (strcmp(k, prop->key()) == 0) { 4198 if (append == AppendProperty) { 4199 prop->append_writeable_value(v); 4200 } else { 4201 prop->set_writeable_value(v); 4202 } 4203 return; 4204 } 4205 } 4206 4207 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4208 } 4209 4210 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4211 // Returns true if all of the source pointed by src has been copied over to 4212 // the destination buffer pointed by buf. Otherwise, returns false. 4213 // Notes: 4214 // 1. If the length (buflen) of the destination buffer excluding the 4215 // NULL terminator character is not long enough for holding the expanded 4216 // pid characters, it also returns false instead of returning the partially 4217 // expanded one. 4218 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4219 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4220 char* buf, size_t buflen) { 4221 const char* p = src; 4222 char* b = buf; 4223 const char* src_end = &src[srclen]; 4224 char* buf_end = &buf[buflen - 1]; 4225 4226 while (p < src_end && b < buf_end) { 4227 if (*p == '%') { 4228 switch (*(++p)) { 4229 case '%': // "%%" ==> "%" 4230 *b++ = *p++; 4231 break; 4232 case 'p': { // "%p" ==> current process id 4233 // buf_end points to the character before the last character so 4234 // that we could write '\0' to the end of the buffer. 4235 size_t buf_sz = buf_end - b + 1; 4236 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4237 4238 // if jio_snprintf fails or the buffer is not long enough to hold 4239 // the expanded pid, returns false. 4240 if (ret < 0 || ret >= (int)buf_sz) { 4241 return false; 4242 } else { 4243 b += ret; 4244 assert(*b == '\0', "fail in copy_expand_pid"); 4245 if (p == src_end && b == buf_end + 1) { 4246 // reach the end of the buffer. 4247 return true; 4248 } 4249 } 4250 p++; 4251 break; 4252 } 4253 default : 4254 *b++ = '%'; 4255 } 4256 } else { 4257 *b++ = *p++; 4258 } 4259 } 4260 *b = '\0'; 4261 return (p == src_end); // return false if not all of the source was copied 4262 } 4263 4264 bool Arguments::parse_malloc_limit_size(const char* s, size_t* out) { 4265 julong limit = 0; 4266 Arguments::ArgsRange range = parse_memory_size(s, &limit, 1, SIZE_MAX); 4267 switch (range) { 4268 case ArgsRange::arg_in_range: 4269 *out = (size_t)limit; 4270 return true; 4271 case ArgsRange::arg_too_big: // only possible on 32-bit 4272 vm_exit_during_initialization("MallocLimit: too large", s); 4273 break; 4274 case ArgsRange::arg_too_small: 4275 vm_exit_during_initialization("MallocLimit: limit must be > 0"); 4276 break; 4277 default: 4278 break; 4279 } 4280 return false; 4281 } 4282 4283 // Helper for parse_malloc_limits 4284 void Arguments::parse_single_category_limit(char* expression, size_t limits[mt_number_of_types]) { 4285 // <category>:<limit> 4286 char* colon = ::strchr(expression, ':'); 4287 if (colon == nullptr) { 4288 vm_exit_during_initialization("MallocLimit: colon missing", expression); 4289 } 4290 *colon = '\0'; 4291 MEMFLAGS f = NMTUtil::string_to_flag(expression); 4292 if (f == mtNone) { 4293 vm_exit_during_initialization("MallocLimit: invalid nmt category", expression); 4294 } 4295 if (parse_malloc_limit_size(colon + 1, limits + (int)f) == false) { 4296 vm_exit_during_initialization("Invalid MallocLimit size", colon + 1); 4297 } 4298 } 4299 4300 void Arguments::parse_malloc_limits(size_t* total_limit, size_t limits[mt_number_of_types]) { 4301 4302 // Reset output to 0 4303 *total_limit = 0; 4304 for (int i = 0; i < mt_number_of_types; i ++) { 4305 limits[i] = 0; 4306 } 4307 4308 // We are done if the option is not given. 4309 if (MallocLimit == nullptr) { 4310 return; 4311 } 4312 4313 // Global form? 4314 if (parse_malloc_limit_size(MallocLimit, total_limit)) { 4315 return; 4316 } 4317 4318 // No. So it must be in category-specific form: MallocLimit=<nmt category>:<size>[,<nmt category>:<size> ..] 4319 char* copy = os::strdup(MallocLimit); 4320 if (copy == nullptr) { 4321 vm_exit_out_of_memory(strlen(MallocLimit), OOM_MALLOC_ERROR, "MallocLimit"); 4322 } 4323 4324 char* p = copy, *q; 4325 do { 4326 q = p; 4327 p = ::strchr(q, ','); 4328 if (p != nullptr) { 4329 *p = '\0'; 4330 p ++; 4331 } 4332 parse_single_category_limit(q, limits); 4333 } while (p != nullptr); 4334 4335 os::free(copy); 4336 4337 }