1 /* 2 * Copyright (c) 1997, 2023, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "cds/cds_globals.hpp" 27 #include "cds/filemap.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/moduleEntry.hpp" 31 #include "classfile/stringTable.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "compiler/compilerDefinitions.hpp" 34 #include "gc/shared/gcArguments.hpp" 35 #include "gc/shared/gcConfig.hpp" 36 #include "gc/shared/stringdedup/stringDedup.hpp" 37 #include "gc/shared/tlab_globals.hpp" 38 #include "jvm.h" 39 #include "logging/log.hpp" 40 #include "logging/logConfiguration.hpp" 41 #include "logging/logStream.hpp" 42 #include "logging/logTag.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/oop.inline.hpp" 46 #include "prims/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 #include <string.h> 73 74 #define DEFAULT_JAVA_LAUNCHER "generic" 75 76 char* Arguments::_jvm_flags_file = NULL; 77 char** Arguments::_jvm_flags_array = NULL; 78 int Arguments::_num_jvm_flags = 0; 79 char** Arguments::_jvm_args_array = NULL; 80 int Arguments::_num_jvm_args = 0; 81 char* Arguments::_java_command = NULL; 82 SystemProperty* Arguments::_system_properties = NULL; 83 size_t Arguments::_conservative_max_heap_alignment = 0; 84 Arguments::Mode Arguments::_mode = _mixed; 85 bool Arguments::_java_compiler = false; 86 bool Arguments::_xdebug_mode = false; 87 const char* Arguments::_java_vendor_url_bug = NULL; 88 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 89 bool Arguments::_sun_java_launcher_is_altjvm = false; 90 91 // These parameters are reset in method parse_vm_init_args() 92 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 93 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 94 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 95 bool Arguments::_ClipInlining = ClipInlining; 96 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 97 98 bool Arguments::_enable_preview = false; 99 100 char* Arguments::SharedArchivePath = NULL; 101 char* Arguments::SharedDynamicArchivePath = NULL; 102 103 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 }; 104 105 AgentLibraryList Arguments::_libraryList; 106 AgentLibraryList Arguments::_agentList; 107 108 // These are not set by the JDK's built-in launchers, but they can be set by 109 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 110 // JavaVMOption in jni.h. 111 abort_hook_t Arguments::_abort_hook = NULL; 112 exit_hook_t Arguments::_exit_hook = NULL; 113 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 114 115 116 SystemProperty *Arguments::_sun_boot_library_path = NULL; 117 SystemProperty *Arguments::_java_library_path = NULL; 118 SystemProperty *Arguments::_java_home = NULL; 119 SystemProperty *Arguments::_java_class_path = NULL; 120 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 121 SystemProperty *Arguments::_vm_info = NULL; 122 123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 124 PathString *Arguments::_boot_class_path = NULL; 125 bool Arguments::_has_jimage = false; 126 127 char* Arguments::_ext_dirs = NULL; 128 129 // True if -Xshare:auto option was specified. 130 static bool xshare_auto_cmd_line = false; 131 132 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 133 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 134 if (new_value == NULL) { 135 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 136 return false; 137 } 138 if (_value != NULL) { 139 FreeHeap(_value); 140 } 141 _value = new_value; 142 strcpy(_value, value); 143 return true; 144 } 145 146 void PathString::append_value(const char *value) { 147 char *sp; 148 size_t len = 0; 149 if (value != NULL) { 150 len = strlen(value); 151 if (_value != NULL) { 152 len += strlen(_value); 153 } 154 sp = AllocateHeap(len+2, mtArguments); 155 assert(sp != NULL, "Unable to allocate space for new append path value"); 156 if (sp != NULL) { 157 if (_value != NULL) { 158 strcpy(sp, _value); 159 strcat(sp, os::path_separator()); 160 strcat(sp, value); 161 FreeHeap(_value); 162 } else { 163 strcpy(sp, value); 164 } 165 _value = sp; 166 } 167 } 168 } 169 170 PathString::PathString(const char* value) { 171 if (value == NULL) { 172 _value = NULL; 173 } else { 174 _value = AllocateHeap(strlen(value)+1, mtArguments); 175 strcpy(_value, value); 176 } 177 } 178 179 PathString::~PathString() { 180 if (_value != NULL) { 181 FreeHeap(_value); 182 _value = NULL; 183 } 184 } 185 186 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 187 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 188 size_t len = strlen(module_name) + 1; 189 _module_name = AllocateHeap(len, mtInternal); 190 strncpy(_module_name, module_name, len); // copy the trailing null 191 _path = new PathString(path); 192 } 193 194 ModulePatchPath::~ModulePatchPath() { 195 if (_module_name != NULL) { 196 FreeHeap(_module_name); 197 _module_name = NULL; 198 } 199 if (_path != NULL) { 200 delete _path; 201 _path = NULL; 202 } 203 } 204 205 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 206 if (key == NULL) { 207 _key = NULL; 208 } else { 209 _key = AllocateHeap(strlen(key)+1, mtArguments); 210 strcpy(_key, key); 211 } 212 _next = NULL; 213 _internal = internal; 214 _writeable = writeable; 215 } 216 217 AgentLibrary::AgentLibrary(const char* name, const char* options, 218 bool is_absolute_path, void* os_lib, 219 bool instrument_lib) { 220 _name = AllocateHeap(strlen(name)+1, mtArguments); 221 strcpy(_name, name); 222 if (options == NULL) { 223 _options = NULL; 224 } else { 225 _options = AllocateHeap(strlen(options)+1, mtArguments); 226 strcpy(_options, options); 227 } 228 _is_absolute_path = is_absolute_path; 229 _os_lib = os_lib; 230 _next = NULL; 231 _state = agent_invalid; 232 _is_static_lib = false; 233 _is_instrument_lib = instrument_lib; 234 } 235 236 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 237 // part of the option string. 238 static bool match_option(const JavaVMOption *option, const char* name, 239 const char** tail) { 240 size_t len = strlen(name); 241 if (strncmp(option->optionString, name, len) == 0) { 242 *tail = option->optionString + len; 243 return true; 244 } else { 245 return false; 246 } 247 } 248 249 // Check if 'option' matches 'name'. No "tail" is allowed. 250 static bool match_option(const JavaVMOption *option, const char* name) { 251 const char* tail = NULL; 252 bool result = match_option(option, name, &tail); 253 if (tail != NULL && *tail == '\0') { 254 return result; 255 } else { 256 return false; 257 } 258 } 259 260 // Return true if any of the strings in null-terminated array 'names' matches. 261 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 262 // the option must match exactly. 263 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 264 bool tail_allowed) { 265 for (/* empty */; *names != NULL; ++names) { 266 if (match_option(option, *names, tail)) { 267 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 268 return true; 269 } 270 } 271 } 272 return false; 273 } 274 275 #if INCLUDE_JFR 276 static bool _has_jfr_option = false; // is using JFR 277 278 // return true on failure 279 static bool match_jfr_option(const JavaVMOption** option) { 280 assert((*option)->optionString != NULL, "invariant"); 281 char* tail = NULL; 282 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 283 _has_jfr_option = true; 284 return Jfr::on_start_flight_recording_option(option, tail); 285 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 286 _has_jfr_option = true; 287 return Jfr::on_flight_recorder_option(option, tail); 288 } 289 return false; 290 } 291 292 bool Arguments::has_jfr_option() { 293 return _has_jfr_option; 294 } 295 #endif 296 297 static void logOption(const char* opt) { 298 if (PrintVMOptions) { 299 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 300 } 301 } 302 303 bool needs_module_property_warning = false; 304 305 #define MODULE_PROPERTY_PREFIX "jdk.module." 306 #define MODULE_PROPERTY_PREFIX_LEN 11 307 #define ADDEXPORTS "addexports" 308 #define ADDEXPORTS_LEN 10 309 #define ADDREADS "addreads" 310 #define ADDREADS_LEN 8 311 #define ADDOPENS "addopens" 312 #define ADDOPENS_LEN 8 313 #define PATCH "patch" 314 #define PATCH_LEN 5 315 #define ADDMODS "addmods" 316 #define ADDMODS_LEN 7 317 #define LIMITMODS "limitmods" 318 #define LIMITMODS_LEN 9 319 #define PATH "path" 320 #define PATH_LEN 4 321 #define UPGRADE_PATH "upgrade.path" 322 #define UPGRADE_PATH_LEN 12 323 #define ENABLE_NATIVE_ACCESS "enable.native.access" 324 #define ENABLE_NATIVE_ACCESS_LEN 20 325 326 void Arguments::add_init_library(const char* name, char* options) { 327 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 328 } 329 330 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 331 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 332 } 333 334 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 335 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 336 } 337 338 // Late-binding agents not started via arguments 339 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 340 _agentList.add(agentLib); 341 } 342 343 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 344 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 345 return ((strncmp(option, property, len) == 0) && 346 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 347 } 348 349 // Return true if property starts with "jdk.module." and its ensuing chars match 350 // any of the reserved module properties. 351 // property should be passed without the leading "-D". 352 bool Arguments::is_internal_module_property(const char* property) { 353 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 354 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 355 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 356 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 357 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 358 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 359 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 360 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 361 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 362 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 363 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 364 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 365 return true; 366 } 367 } 368 return false; 369 } 370 371 // Process java launcher properties. 372 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 373 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 374 // Must do this before setting up other system properties, 375 // as some of them may depend on launcher type. 376 for (int index = 0; index < args->nOptions; index++) { 377 const JavaVMOption* option = args->options + index; 378 const char* tail; 379 380 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 381 process_java_launcher_argument(tail, option->extraInfo); 382 continue; 383 } 384 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 385 if (strcmp(tail, "true") == 0) { 386 _sun_java_launcher_is_altjvm = true; 387 } 388 continue; 389 } 390 } 391 } 392 393 // Initialize system properties key and value. 394 void Arguments::init_system_properties() { 395 396 // Set up _boot_class_path which is not a property but 397 // relies heavily on argument processing and the jdk.boot.class.path.append 398 // property. It is used to store the underlying boot class path. 399 _boot_class_path = new PathString(NULL); 400 401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 402 "Java Virtual Machine Specification", false)); 403 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 404 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 405 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 406 407 // Initialize the vm.info now, but it will need updating after argument parsing. 408 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 409 410 // Following are JVMTI agent writable properties. 411 // Properties values are set to NULL and they are 412 // os specific they are initialized in os::init_system_properties_values(). 413 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 414 _java_library_path = new SystemProperty("java.library.path", NULL, true); 415 _java_home = new SystemProperty("java.home", NULL, true); 416 _java_class_path = new SystemProperty("java.class.path", "", true); 417 // jdk.boot.class.path.append is a non-writeable, internal property. 418 // It can only be set by either: 419 // - -Xbootclasspath/a: 420 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 421 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", NULL, false, true); 422 423 // Add to System Property list. 424 PropertyList_add(&_system_properties, _sun_boot_library_path); 425 PropertyList_add(&_system_properties, _java_library_path); 426 PropertyList_add(&_system_properties, _java_home); 427 PropertyList_add(&_system_properties, _java_class_path); 428 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 429 PropertyList_add(&_system_properties, _vm_info); 430 431 // Set OS specific system properties values 432 os::init_system_properties_values(); 433 } 434 435 // Update/Initialize System properties after JDK version number is known 436 void Arguments::init_version_specific_system_properties() { 437 enum { bufsz = 16 }; 438 char buffer[bufsz]; 439 const char* spec_vendor = "Oracle Corporation"; 440 uint32_t spec_version = JDK_Version::current().major_version(); 441 442 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 443 444 PropertyList_add(&_system_properties, 445 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 446 PropertyList_add(&_system_properties, 447 new SystemProperty("java.vm.specification.version", buffer, false)); 448 PropertyList_add(&_system_properties, 449 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 450 } 451 452 /* 453 * -XX argument processing: 454 * 455 * -XX arguments are defined in several places, such as: 456 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 457 * -XX arguments are parsed in parse_argument(). 458 * -XX argument bounds checking is done in check_vm_args_consistency(). 459 * 460 * Over time -XX arguments may change. There are mechanisms to handle common cases: 461 * 462 * ALIASED: An option that is simply another name for another option. This is often 463 * part of the process of deprecating a flag, but not all aliases need 464 * to be deprecated. 465 * 466 * Create an alias for an option by adding the old and new option names to the 467 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 468 * 469 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 470 * support may be removed in the future. Both regular and aliased options may be 471 * deprecated. 472 * 473 * Add a deprecation warning for an option (or alias) by adding an entry in the 474 * "special_jvm_flags" table and setting the "deprecated_in" field. 475 * Often an option "deprecated" in one major release will 476 * be made "obsolete" in the next. In this case the entry should also have its 477 * "obsolete_in" field set. 478 * 479 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 480 * on the command line. A warning is printed to let the user know that option might not 481 * be accepted in the future. 482 * 483 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 484 * table and setting the "obsolete_in" field. 485 * 486 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 487 * to the current JDK version. The system will flatly refuse to admit the existence of 488 * the flag. This allows a flag to die automatically over JDK releases. 489 * 490 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 491 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 492 * - Newly obsolete or expired deprecated options should have their global variable 493 * definitions removed (from globals.hpp, etc) and related implementations removed. 494 * 495 * Recommended approach for removing options: 496 * 497 * To remove options commonly used by customers (e.g. product -XX options), use 498 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 499 * 500 * To remove internal options (e.g. diagnostic, experimental, develop options), use 501 * a 2-step model adding major release numbers to the obsolete and expire columns. 502 * 503 * To change the name of an option, use the alias table as well as a 2-step 504 * model adding major release numbers to the deprecate and expire columns. 505 * Think twice about aliasing commonly used customer options. 506 * 507 * There are times when it is appropriate to leave a future release number as undefined. 508 * 509 * Tests: Aliases should be tested in VMAliasOptions.java. 510 * Deprecated options should be tested in VMDeprecatedOptions.java. 511 */ 512 513 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 514 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 515 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 516 // the command-line as usual, but will issue a warning. 517 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 518 // the command-line, while issuing a warning and ignoring the flag value. 519 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 520 // existence of the flag. 521 // 522 // MANUAL CLEANUP ON JDK VERSION UPDATES: 523 // This table ensures that the handling of options will update automatically when the JDK 524 // version is incremented, but the source code needs to be cleanup up manually: 525 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 526 // variable should be removed, as well as users of the variable. 527 // - As "deprecated" options age into "obsolete" options, move the entry into the 528 // "Obsolete Flags" section of the table. 529 // - All expired options should be removed from the table. 530 static SpecialFlag const special_jvm_flags[] = { 531 // -------------- Deprecated Flags -------------- 532 // --- Non-alias flags - sorted by obsolete_in then expired_in: 533 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 534 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 535 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 536 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 537 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 538 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 539 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 540 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 541 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 542 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 543 { "EnableWaitForParallelLoad", JDK_Version::jdk(20), JDK_Version::jdk(21), JDK_Version::jdk(22) }, 544 545 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 546 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 547 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 548 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 549 550 // -------------- Obsolete Flags - sorted by expired_in -------------- 551 552 { "G1ConcRefinementGreenZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 553 { "G1ConcRefinementYellowZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 554 { "G1ConcRefinementRedZone", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 555 { "G1ConcRefinementThresholdStep", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 556 { "G1UseAdaptiveConcRefinement", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 557 { "G1ConcRefinementServiceIntervalMillis", JDK_Version::undefined(), JDK_Version::jdk(20), JDK_Version::undefined() }, 558 559 #ifdef ASSERT 560 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 561 #endif 562 563 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 564 // These entries will generate build errors. Their purpose is to test the macros. 565 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 566 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 567 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 568 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 569 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 570 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 571 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 572 #endif 573 574 { NULL, JDK_Version(0), JDK_Version(0) } 575 }; 576 577 // Flags that are aliases for other flags. 578 typedef struct { 579 const char* alias_name; 580 const char* real_name; 581 } AliasedFlag; 582 583 static AliasedFlag const aliased_jvm_flags[] = { 584 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 585 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 586 { NULL, NULL} 587 }; 588 589 // Return true if "v" is less than "other", where "other" may be "undefined". 590 static bool version_less_than(JDK_Version v, JDK_Version other) { 591 assert(!v.is_undefined(), "must be defined"); 592 if (!other.is_undefined() && v.compare(other) >= 0) { 593 return false; 594 } else { 595 return true; 596 } 597 } 598 599 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 600 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 601 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 602 flag = special_jvm_flags[i]; 603 return true; 604 } 605 } 606 return false; 607 } 608 609 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 610 assert(version != NULL, "Must provide a version buffer"); 611 SpecialFlag flag; 612 if (lookup_special_flag(flag_name, flag)) { 613 if (!flag.obsolete_in.is_undefined()) { 614 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 615 *version = flag.obsolete_in; 616 // This flag may have been marked for obsoletion in this version, but we may not 617 // have actually removed it yet. Rather than ignoring it as soon as we reach 618 // this version we allow some time for the removal to happen. So if the flag 619 // still actually exists we process it as normal, but issue an adjusted warning. 620 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 621 if (real_flag != NULL) { 622 char version_str[256]; 623 version->to_string(version_str, sizeof(version_str)); 624 warning("Temporarily processing option %s; support is scheduled for removal in %s", 625 flag_name, version_str); 626 return false; 627 } 628 return true; 629 } 630 } 631 } 632 return false; 633 } 634 635 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 636 assert(version != NULL, "Must provide a version buffer"); 637 SpecialFlag flag; 638 if (lookup_special_flag(flag_name, flag)) { 639 if (!flag.deprecated_in.is_undefined()) { 640 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 641 version_less_than(JDK_Version::current(), flag.expired_in)) { 642 *version = flag.deprecated_in; 643 return 1; 644 } else { 645 return -1; 646 } 647 } 648 } 649 return 0; 650 } 651 652 const char* Arguments::real_flag_name(const char *flag_name) { 653 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 654 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 655 if (strcmp(flag_status.alias_name, flag_name) == 0) { 656 return flag_status.real_name; 657 } 658 } 659 return flag_name; 660 } 661 662 #ifdef ASSERT 663 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 664 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 665 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 666 return true; 667 } 668 } 669 return false; 670 } 671 672 // Verifies the correctness of the entries in the special_jvm_flags table. 673 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 674 // version being earlier than the deprecation version, then a warning is issued 675 // and verification fails - by returning false. If it is detected that the table 676 // is out of date, with respect to the current version, then ideally a warning is 677 // issued but verification does not fail. This allows the VM to operate when the 678 // version is first updated, without needing to update all the impacted flags at 679 // the same time. In practice we can't issue the warning immediately when the version 680 // is updated as it occurs for every test and some tests are not prepared to handle 681 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 682 // if the check_globals flag is true, and in addition allow a grace period and only 683 // check for stale flags when we hit build 25 (which is far enough into the 6 month 684 // release cycle that all flag updates should have been processed, whilst still 685 // leaving time to make the change before RDP2). 686 // We use a gtest to call this, passing true, so that we can detect stale flags before 687 // the end of the release cycle. 688 689 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 690 691 bool Arguments::verify_special_jvm_flags(bool check_globals) { 692 bool success = true; 693 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 694 const SpecialFlag& flag = special_jvm_flags[i]; 695 if (lookup_special_flag(flag.name, i)) { 696 warning("Duplicate special flag declaration \"%s\"", flag.name); 697 success = false; 698 } 699 if (flag.deprecated_in.is_undefined() && 700 flag.obsolete_in.is_undefined()) { 701 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 702 success = false; 703 } 704 705 if (!flag.deprecated_in.is_undefined()) { 706 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 707 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 708 success = false; 709 } 710 711 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 712 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 713 success = false; 714 } 715 } 716 717 if (!flag.obsolete_in.is_undefined()) { 718 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 719 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 720 success = false; 721 } 722 723 // if flag has become obsolete it should not have a "globals" flag defined anymore. 724 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 725 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 726 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 727 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 728 success = false; 729 } 730 } 731 732 } else if (!flag.expired_in.is_undefined()) { 733 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 734 success = false; 735 } 736 737 if (!flag.expired_in.is_undefined()) { 738 // if flag has become expired it should not have a "globals" flag defined anymore. 739 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 740 !version_less_than(JDK_Version::current(), flag.expired_in)) { 741 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 742 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 743 success = false; 744 } 745 } 746 } 747 } 748 return success; 749 } 750 #endif 751 752 bool Arguments::atojulong(const char *s, julong* result) { 753 return parse_integer(s, result); 754 } 755 756 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 757 if (size < min_size) return arg_too_small; 758 if (size > max_size) return arg_too_big; 759 return arg_in_range; 760 } 761 762 // Describe an argument out of range error 763 void Arguments::describe_range_error(ArgsRange errcode) { 764 switch(errcode) { 765 case arg_too_big: 766 jio_fprintf(defaultStream::error_stream(), 767 "The specified size exceeds the maximum " 768 "representable size.\n"); 769 break; 770 case arg_too_small: 771 case arg_unreadable: 772 case arg_in_range: 773 // do nothing for now 774 break; 775 default: 776 ShouldNotReachHere(); 777 } 778 } 779 780 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 781 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 782 return true; 783 } else { 784 return false; 785 } 786 } 787 788 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 789 // strtod allows leading whitespace, but our flag format does not. 790 if (*value == '\0' || isspace(*value)) { 791 return false; 792 } 793 char* end; 794 errno = 0; 795 double v = strtod(value, &end); 796 if ((errno != 0) || (*end != 0)) { 797 return false; 798 } 799 if (g_isnan(v) || !g_isfinite(v)) { 800 // Currently we cannot handle these special values. 801 return false; 802 } 803 804 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 805 return true; 806 } 807 return false; 808 } 809 810 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 811 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 812 813 if (flag->is_int()) { 814 int v; 815 if (parse_integer(value, &v)) { 816 result = JVMFlagAccess::set_int(flag, &v, origin); 817 } 818 } else if (flag->is_uint()) { 819 uint v; 820 if (parse_integer(value, &v)) { 821 result = JVMFlagAccess::set_uint(flag, &v, origin); 822 } 823 } else if (flag->is_intx()) { 824 intx v; 825 if (parse_integer(value, &v)) { 826 result = JVMFlagAccess::set_intx(flag, &v, origin); 827 } 828 } else if (flag->is_uintx()) { 829 uintx v; 830 if (parse_integer(value, &v)) { 831 result = JVMFlagAccess::set_uintx(flag, &v, origin); 832 } 833 } else if (flag->is_uint64_t()) { 834 uint64_t v; 835 if (parse_integer(value, &v)) { 836 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 837 } 838 } else if (flag->is_size_t()) { 839 size_t v; 840 if (parse_integer(value, &v)) { 841 result = JVMFlagAccess::set_size_t(flag, &v, origin); 842 } 843 } 844 845 return result == JVMFlag::SUCCESS; 846 } 847 848 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 849 if (value[0] == '\0') { 850 value = NULL; 851 } 852 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 853 // Contract: JVMFlag always returns a pointer that needs freeing. 854 FREE_C_HEAP_ARRAY(char, value); 855 return true; 856 } 857 858 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 859 const char* old_value = ""; 860 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 861 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 862 size_t new_len = strlen(new_value); 863 const char* value; 864 char* free_this_too = NULL; 865 if (old_len == 0) { 866 value = new_value; 867 } else if (new_len == 0) { 868 value = old_value; 869 } else { 870 size_t length = old_len + 1 + new_len + 1; 871 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 872 // each new setting adds another LINE to the switch: 873 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 874 value = buf; 875 free_this_too = buf; 876 } 877 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 878 // JVMFlag always returns a pointer that needs freeing. 879 FREE_C_HEAP_ARRAY(char, value); 880 // JVMFlag made its own copy, so I must delete my own temp. buffer. 881 FREE_C_HEAP_ARRAY(char, free_this_too); 882 return true; 883 } 884 885 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 886 const char* real_name = real_flag_name(arg); 887 JDK_Version since = JDK_Version(); 888 switch (is_deprecated_flag(arg, &since)) { 889 case -1: { 890 // Obsolete or expired, so don't process normally, 891 // but allow for an obsolete flag we're still 892 // temporarily allowing. 893 if (!is_obsolete_flag(arg, &since)) { 894 return real_name; 895 } 896 // Note if we're not considered obsolete then we can't be expired either 897 // as obsoletion must come first. 898 return NULL; 899 } 900 case 0: 901 return real_name; 902 case 1: { 903 char version[256]; 904 since.to_string(version, sizeof(version)); 905 if (real_name != arg) { 906 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 907 arg, version, real_name); 908 } else { 909 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 910 arg, version); 911 } 912 return real_name; 913 } 914 } 915 ShouldNotReachHere(); 916 return NULL; 917 } 918 919 #define BUFLEN 255 920 921 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 922 char name_copied[BUFLEN+1]; 923 if (name[name_length] != 0) { 924 if (name_length > BUFLEN) { 925 return NULL; 926 } else { 927 strncpy(name_copied, name, name_length); 928 name_copied[name_length] = '\0'; 929 name = name_copied; 930 } 931 } 932 933 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 934 if (real_name == NULL) { 935 return NULL; 936 } 937 JVMFlag* flag = JVMFlag::find_flag(real_name); 938 return flag; 939 } 940 941 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 942 bool is_bool = false; 943 bool bool_val = false; 944 char c = *arg; 945 if (c == '+' || c == '-') { 946 is_bool = true; 947 bool_val = (c == '+'); 948 arg++; 949 } 950 951 const char* name = arg; 952 while (true) { 953 c = *arg; 954 if (isalnum(c) || (c == '_')) { 955 ++arg; 956 } else { 957 break; 958 } 959 } 960 961 size_t name_len = size_t(arg - name); 962 if (name_len == 0) { 963 return false; 964 } 965 966 JVMFlag* flag = find_jvm_flag(name, name_len); 967 if (flag == NULL) { 968 return false; 969 } 970 971 if (is_bool) { 972 if (*arg != 0) { 973 // Error -- extra characters such as -XX:+BoolFlag=123 974 return false; 975 } 976 return set_bool_flag(flag, bool_val, origin); 977 } 978 979 if (arg[0] == '=') { 980 const char* value = arg + 1; 981 if (flag->is_ccstr()) { 982 if (flag->ccstr_accumulates()) { 983 return append_to_string_flag(flag, value, origin); 984 } else { 985 return set_string_flag(flag, value, origin); 986 } 987 } else if (flag->is_double()) { 988 return set_fp_numeric_flag(flag, value, origin); 989 } else { 990 return set_numeric_flag(flag, value, origin); 991 } 992 } 993 994 if (arg[0] == ':' && arg[1] == '=') { 995 // -XX:Foo:=xxx will reset the string flag to the given value. 996 const char* value = arg + 2; 997 return set_string_flag(flag, value, origin); 998 } 999 1000 return false; 1001 } 1002 1003 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1004 assert(bldarray != NULL, "illegal argument"); 1005 1006 if (arg == NULL) { 1007 return; 1008 } 1009 1010 int new_count = *count + 1; 1011 1012 // expand the array and add arg to the last element 1013 if (*bldarray == NULL) { 1014 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1015 } else { 1016 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1017 } 1018 (*bldarray)[*count] = os::strdup_check_oom(arg); 1019 *count = new_count; 1020 } 1021 1022 void Arguments::build_jvm_args(const char* arg) { 1023 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1024 } 1025 1026 void Arguments::build_jvm_flags(const char* arg) { 1027 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1028 } 1029 1030 // utility function to return a string that concatenates all 1031 // strings in a given char** array 1032 const char* Arguments::build_resource_string(char** args, int count) { 1033 if (args == NULL || count == 0) { 1034 return NULL; 1035 } 1036 size_t length = 0; 1037 for (int i = 0; i < count; i++) { 1038 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1039 } 1040 char* s = NEW_RESOURCE_ARRAY(char, length); 1041 char* dst = s; 1042 for (int j = 0; j < count; j++) { 1043 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1044 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1045 dst += offset; 1046 length -= offset; 1047 } 1048 return (const char*) s; 1049 } 1050 1051 void Arguments::print_on(outputStream* st) { 1052 st->print_cr("VM Arguments:"); 1053 if (num_jvm_flags() > 0) { 1054 st->print("jvm_flags: "); print_jvm_flags_on(st); 1055 st->cr(); 1056 } 1057 if (num_jvm_args() > 0) { 1058 st->print("jvm_args: "); print_jvm_args_on(st); 1059 st->cr(); 1060 } 1061 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1062 if (_java_class_path != NULL) { 1063 char* path = _java_class_path->value(); 1064 size_t len = strlen(path); 1065 st->print("java_class_path (initial): "); 1066 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1067 if (len == 0) { 1068 st->print_raw_cr("<not set>"); 1069 } else { 1070 st->print_raw_cr(path, len); 1071 } 1072 } 1073 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1074 } 1075 1076 void Arguments::print_summary_on(outputStream* st) { 1077 // Print the command line. Environment variables that are helpful for 1078 // reproducing the problem are written later in the hs_err file. 1079 // flags are from setting file 1080 if (num_jvm_flags() > 0) { 1081 st->print_raw("Settings File: "); 1082 print_jvm_flags_on(st); 1083 st->cr(); 1084 } 1085 // args are the command line and environment variable arguments. 1086 st->print_raw("Command Line: "); 1087 if (num_jvm_args() > 0) { 1088 print_jvm_args_on(st); 1089 } 1090 // this is the classfile and any arguments to the java program 1091 if (java_command() != NULL) { 1092 st->print("%s", java_command()); 1093 } 1094 st->cr(); 1095 } 1096 1097 void Arguments::print_jvm_flags_on(outputStream* st) { 1098 if (_num_jvm_flags > 0) { 1099 for (int i=0; i < _num_jvm_flags; i++) { 1100 st->print("%s ", _jvm_flags_array[i]); 1101 } 1102 } 1103 } 1104 1105 void Arguments::print_jvm_args_on(outputStream* st) { 1106 if (_num_jvm_args > 0) { 1107 for (int i=0; i < _num_jvm_args; i++) { 1108 st->print("%s ", _jvm_args_array[i]); 1109 } 1110 } 1111 } 1112 1113 bool Arguments::process_argument(const char* arg, 1114 jboolean ignore_unrecognized, 1115 JVMFlagOrigin origin) { 1116 JDK_Version since = JDK_Version(); 1117 1118 if (parse_argument(arg, origin)) { 1119 return true; 1120 } 1121 1122 // Determine if the flag has '+', '-', or '=' characters. 1123 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1124 const char* const argname = has_plus_minus ? arg + 1 : arg; 1125 1126 size_t arg_len; 1127 const char* equal_sign = strchr(argname, '='); 1128 if (equal_sign == NULL) { 1129 arg_len = strlen(argname); 1130 } else { 1131 arg_len = equal_sign - argname; 1132 } 1133 1134 // Only make the obsolete check for valid arguments. 1135 if (arg_len <= BUFLEN) { 1136 // Construct a string which consists only of the argument name without '+', '-', or '='. 1137 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1138 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1139 if (is_obsolete_flag(stripped_argname, &since)) { 1140 char version[256]; 1141 since.to_string(version, sizeof(version)); 1142 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1143 return true; 1144 } 1145 } 1146 1147 // For locked flags, report a custom error message if available. 1148 // Otherwise, report the standard unrecognized VM option. 1149 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1150 if (found_flag != NULL) { 1151 char locked_message_buf[BUFLEN]; 1152 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1153 if (strlen(locked_message_buf) == 0) { 1154 if (found_flag->is_bool() && !has_plus_minus) { 1155 jio_fprintf(defaultStream::error_stream(), 1156 "Missing +/- setting for VM option '%s'\n", argname); 1157 } else if (!found_flag->is_bool() && has_plus_minus) { 1158 jio_fprintf(defaultStream::error_stream(), 1159 "Unexpected +/- setting in VM option '%s'\n", argname); 1160 } else { 1161 jio_fprintf(defaultStream::error_stream(), 1162 "Improperly specified VM option '%s'\n", argname); 1163 } 1164 } else { 1165 #ifdef PRODUCT 1166 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1167 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1168 if (ignore_unrecognized && mismatched) { 1169 return true; 1170 } 1171 #endif 1172 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1173 } 1174 } else { 1175 if (ignore_unrecognized) { 1176 return true; 1177 } 1178 jio_fprintf(defaultStream::error_stream(), 1179 "Unrecognized VM option '%s'\n", argname); 1180 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1181 if (fuzzy_matched != NULL) { 1182 jio_fprintf(defaultStream::error_stream(), 1183 "Did you mean '%s%s%s'? ", 1184 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1185 fuzzy_matched->name(), 1186 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1187 } 1188 } 1189 1190 // allow for commandline "commenting out" options like -XX:#+Verbose 1191 return arg[0] == '#'; 1192 } 1193 1194 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1195 FILE* stream = os::fopen(file_name, "rb"); 1196 if (stream == NULL) { 1197 if (should_exist) { 1198 jio_fprintf(defaultStream::error_stream(), 1199 "Could not open settings file %s\n", file_name); 1200 return false; 1201 } else { 1202 return true; 1203 } 1204 } 1205 1206 char token[1024]; 1207 int pos = 0; 1208 1209 bool in_white_space = true; 1210 bool in_comment = false; 1211 bool in_quote = false; 1212 char quote_c = 0; 1213 bool result = true; 1214 1215 int c = getc(stream); 1216 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1217 if (in_white_space) { 1218 if (in_comment) { 1219 if (c == '\n') in_comment = false; 1220 } else { 1221 if (c == '#') in_comment = true; 1222 else if (!isspace(c)) { 1223 in_white_space = false; 1224 token[pos++] = c; 1225 } 1226 } 1227 } else { 1228 if (c == '\n' || (!in_quote && isspace(c))) { 1229 // token ends at newline, or at unquoted whitespace 1230 // this allows a way to include spaces in string-valued options 1231 token[pos] = '\0'; 1232 logOption(token); 1233 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1234 build_jvm_flags(token); 1235 pos = 0; 1236 in_white_space = true; 1237 in_quote = false; 1238 } else if (!in_quote && (c == '\'' || c == '"')) { 1239 in_quote = true; 1240 quote_c = c; 1241 } else if (in_quote && (c == quote_c)) { 1242 in_quote = false; 1243 } else { 1244 token[pos++] = c; 1245 } 1246 } 1247 c = getc(stream); 1248 } 1249 if (pos > 0) { 1250 token[pos] = '\0'; 1251 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1252 build_jvm_flags(token); 1253 } 1254 fclose(stream); 1255 return result; 1256 } 1257 1258 //============================================================================================================= 1259 // Parsing of properties (-D) 1260 1261 const char* Arguments::get_property(const char* key) { 1262 return PropertyList_get_value(system_properties(), key); 1263 } 1264 1265 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1266 const char* eq = strchr(prop, '='); 1267 const char* key; 1268 const char* value = ""; 1269 1270 if (eq == NULL) { 1271 // property doesn't have a value, thus use passed string 1272 key = prop; 1273 } else { 1274 // property have a value, thus extract it and save to the 1275 // allocated string 1276 size_t key_len = eq - prop; 1277 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1278 1279 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1280 key = tmp_key; 1281 1282 value = &prop[key_len + 1]; 1283 } 1284 1285 #if INCLUDE_CDS 1286 if (is_internal_module_property(key) || 1287 strcmp(key, "jdk.module.main") == 0) { 1288 MetaspaceShared::disable_optimized_module_handling(); 1289 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value); 1290 } 1291 if (strcmp(key, "jdk.module.showModuleResolution") == 0 || 1292 strcmp(key, "jdk.module.validation") == 0 || 1293 strcmp(key, "java.system.class.loader") == 0) { 1294 MetaspaceShared::disable_full_module_graph(); 1295 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value); 1296 } 1297 #endif 1298 1299 if (strcmp(key, "java.compiler") == 0) { 1300 process_java_compiler_argument(value); 1301 // Record value in Arguments, but let it get passed to Java. 1302 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1303 // sun.java.launcher.is_altjvm property is 1304 // private and is processed in process_sun_java_launcher_properties(); 1305 // the sun.java.launcher property is passed on to the java application 1306 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1307 // append is true, writable is true, internal is false 1308 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1309 WriteableProperty, ExternalProperty); 1310 } else { 1311 if (strcmp(key, "sun.java.command") == 0) { 1312 char *old_java_command = _java_command; 1313 _java_command = os::strdup_check_oom(value, mtArguments); 1314 if (old_java_command != NULL) { 1315 os::free(old_java_command); 1316 } 1317 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1318 // If this property is set on the command line then its value will be 1319 // displayed in VM error logs as the URL at which to submit such logs. 1320 // Normally the URL displayed in error logs is different from the value 1321 // of this system property, so a different property should have been 1322 // used here, but we leave this as-is in case someone depends upon it. 1323 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1324 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1325 // its value without going through the property list or making a Java call. 1326 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1327 if (old_java_vendor_url_bug != NULL) { 1328 os::free((void *)old_java_vendor_url_bug); 1329 } 1330 } 1331 1332 // Create new property and add at the end of the list 1333 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1334 } 1335 1336 if (key != prop) { 1337 // SystemProperty copy passed value, thus free previously allocated 1338 // memory 1339 FreeHeap((void *)key); 1340 } 1341 1342 return true; 1343 } 1344 1345 #if INCLUDE_CDS 1346 const char* unsupported_properties[] = { "jdk.module.limitmods", 1347 "jdk.module.upgrade.path", 1348 "jdk.module.patch.0" }; 1349 const char* unsupported_options[] = { "--limit-modules", 1350 "--upgrade-module-path", 1351 "--patch-module" 1352 }; 1353 void Arguments::check_unsupported_dumping_properties() { 1354 assert(is_dumping_archive(), 1355 "this function is only used with CDS dump time"); 1356 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1357 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1358 SystemProperty* sp = system_properties(); 1359 while (sp != NULL) { 1360 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1361 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1362 vm_exit_during_initialization( 1363 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1364 } 1365 } 1366 sp = sp->next(); 1367 } 1368 1369 // Check for an exploded module build in use with -Xshare:dump. 1370 if (!has_jimage()) { 1371 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1372 } 1373 } 1374 1375 bool Arguments::check_unsupported_cds_runtime_properties() { 1376 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1377 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1378 if (ArchiveClassesAtExit != NULL) { 1379 // dynamic dumping, just return false for now. 1380 // check_unsupported_dumping_properties() will be called later to check the same set of 1381 // properties, and will exit the VM with the correct error message if the unsupported properties 1382 // are used. 1383 return false; 1384 } 1385 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1386 if (get_property(unsupported_properties[i]) != NULL) { 1387 if (RequireSharedSpaces) { 1388 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1389 } else { 1390 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1391 } 1392 return true; 1393 } 1394 } 1395 return false; 1396 } 1397 #endif 1398 1399 //=========================================================================================================== 1400 // Setting int/mixed/comp mode flags 1401 1402 void Arguments::set_mode_flags(Mode mode) { 1403 // Set up default values for all flags. 1404 // If you add a flag to any of the branches below, 1405 // add a default value for it here. 1406 set_java_compiler(false); 1407 _mode = mode; 1408 1409 // Ensure Agent_OnLoad has the correct initial values. 1410 // This may not be the final mode; mode may change later in onload phase. 1411 PropertyList_unique_add(&_system_properties, "java.vm.info", 1412 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1413 1414 UseInterpreter = true; 1415 UseCompiler = true; 1416 UseLoopCounter = true; 1417 1418 // Default values may be platform/compiler dependent - 1419 // use the saved values 1420 ClipInlining = Arguments::_ClipInlining; 1421 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1422 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1423 BackgroundCompilation = Arguments::_BackgroundCompilation; 1424 1425 // Change from defaults based on mode 1426 switch (mode) { 1427 default: 1428 ShouldNotReachHere(); 1429 break; 1430 case _int: 1431 UseCompiler = false; 1432 UseLoopCounter = false; 1433 AlwaysCompileLoopMethods = false; 1434 UseOnStackReplacement = false; 1435 break; 1436 case _mixed: 1437 // same as default 1438 break; 1439 case _comp: 1440 UseInterpreter = false; 1441 BackgroundCompilation = false; 1442 ClipInlining = false; 1443 break; 1444 } 1445 } 1446 1447 // Conflict: required to use shared spaces (-Xshare:on), but 1448 // incompatible command line options were chosen. 1449 static void no_shared_spaces(const char* message) { 1450 if (RequireSharedSpaces) { 1451 jio_fprintf(defaultStream::error_stream(), 1452 "Class data sharing is inconsistent with other specified options.\n"); 1453 vm_exit_during_initialization("Unable to use shared archive", message); 1454 } else { 1455 log_info(cds)("Unable to use shared archive: %s", message); 1456 UseSharedSpaces = false; 1457 } 1458 } 1459 1460 void set_object_alignment() { 1461 // Object alignment. 1462 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1463 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1464 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1465 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1466 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1467 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1468 1469 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1470 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1471 1472 // Oop encoding heap max 1473 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1474 } 1475 1476 size_t Arguments::max_heap_for_compressed_oops() { 1477 // Avoid sign flip. 1478 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1479 // We need to fit both the NULL page and the heap into the memory budget, while 1480 // keeping alignment constraints of the heap. To guarantee the latter, as the 1481 // NULL page is located before the heap, we pad the NULL page to the conservative 1482 // maximum alignment that the GC may ever impose upon the heap. 1483 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1484 _conservative_max_heap_alignment); 1485 1486 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1487 NOT_LP64(ShouldNotReachHere(); return 0); 1488 } 1489 1490 void Arguments::set_use_compressed_oops() { 1491 #ifdef _LP64 1492 // MaxHeapSize is not set up properly at this point, but 1493 // the only value that can override MaxHeapSize if we are 1494 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1495 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1496 1497 if (max_heap_size <= max_heap_for_compressed_oops()) { 1498 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1499 FLAG_SET_ERGO(UseCompressedOops, true); 1500 } 1501 } else { 1502 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1503 warning("Max heap size too large for Compressed Oops"); 1504 FLAG_SET_DEFAULT(UseCompressedOops, false); 1505 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) { 1506 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1507 } 1508 } 1509 } 1510 #endif // _LP64 1511 } 1512 1513 1514 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1515 // set_use_compressed_oops(). 1516 void Arguments::set_use_compressed_klass_ptrs() { 1517 #ifdef _LP64 1518 // On some architectures, the use of UseCompressedClassPointers implies the use of 1519 // UseCompressedOops. The reason is that the rheap_base register of said platforms 1520 // is reused to perform some optimized spilling, in order to use rheap_base as a 1521 // temp register. But by treating it as any other temp register, spilling can typically 1522 // be completely avoided instead. So it is better not to perform this trick. And by 1523 // not having that reliance, large heaps, or heaps not supporting compressed oops, 1524 // can still use compressed class pointers. 1525 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) { 1526 if (UseCompressedClassPointers) { 1527 warning("UseCompressedClassPointers requires UseCompressedOops"); 1528 } 1529 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1530 } else { 1531 // Turn on UseCompressedClassPointers too 1532 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1533 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1534 } 1535 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1536 if (UseCompressedClassPointers) { 1537 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1538 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1539 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1540 } 1541 } 1542 } 1543 #endif // _LP64 1544 } 1545 1546 void Arguments::set_conservative_max_heap_alignment() { 1547 // The conservative maximum required alignment for the heap is the maximum of 1548 // the alignments imposed by several sources: any requirements from the heap 1549 // itself and the maximum page size we may run the VM with. 1550 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1551 _conservative_max_heap_alignment = MAX4(heap_alignment, 1552 (size_t)os::vm_allocation_granularity(), 1553 os::max_page_size(), 1554 GCArguments::compute_heap_alignment()); 1555 } 1556 1557 jint Arguments::set_ergonomics_flags() { 1558 GCConfig::initialize(); 1559 1560 set_conservative_max_heap_alignment(); 1561 1562 #ifdef _LP64 1563 set_use_compressed_oops(); 1564 1565 // set_use_compressed_klass_ptrs() must be called after calling 1566 // set_use_compressed_oops(). 1567 set_use_compressed_klass_ptrs(); 1568 1569 // Also checks that certain machines are slower with compressed oops 1570 // in vm_version initialization code. 1571 #endif // _LP64 1572 1573 return JNI_OK; 1574 } 1575 1576 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1577 size_t max_allocatable; 1578 size_t result = limit; 1579 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1580 // The AggressiveHeap check is a temporary workaround to avoid calling 1581 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1582 // selected. This works because AggressiveHeap implies UseParallelGC 1583 // where we know the ratio will be 1. Once the AggressiveHeap option is 1584 // removed, this can be cleaned up. 1585 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1586 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1587 result = MIN2(result, max_allocatable / fraction); 1588 } 1589 return result; 1590 } 1591 1592 // Use static initialization to get the default before parsing 1593 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1594 1595 void Arguments::set_heap_size() { 1596 julong phys_mem; 1597 1598 // If the user specified one of these options, they 1599 // want specific memory sizing so do not limit memory 1600 // based on compressed oops addressability. 1601 // Also, memory limits will be calculated based on 1602 // available os physical memory, not our MaxRAM limit, 1603 // unless MaxRAM is also specified. 1604 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1605 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1606 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1607 !FLAG_IS_DEFAULT(MinRAMFraction) || 1608 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1609 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1610 !FLAG_IS_DEFAULT(MaxRAM)); 1611 if (override_coop_limit) { 1612 if (FLAG_IS_DEFAULT(MaxRAM)) { 1613 phys_mem = os::physical_memory(); 1614 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1615 } else { 1616 phys_mem = (julong)MaxRAM; 1617 } 1618 } else { 1619 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1620 : (julong)MaxRAM; 1621 } 1622 1623 1624 // Convert deprecated flags 1625 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1626 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1627 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1628 1629 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1630 !FLAG_IS_DEFAULT(MinRAMFraction)) 1631 MinRAMPercentage = 100.0 / MinRAMFraction; 1632 1633 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1634 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1635 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1636 1637 // If the maximum heap size has not been set with -Xmx, 1638 // then set it as fraction of the size of physical memory, 1639 // respecting the maximum and minimum sizes of the heap. 1640 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1641 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1642 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1643 if (reasonable_min < MaxHeapSize) { 1644 // Small physical memory, so use a minimum fraction of it for the heap 1645 reasonable_max = reasonable_min; 1646 } else { 1647 // Not-small physical memory, so require a heap at least 1648 // as large as MaxHeapSize 1649 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1650 } 1651 1652 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1653 // Limit the heap size to ErgoHeapSizeLimit 1654 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1655 } 1656 1657 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1658 1659 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1660 // An initial heap size was specified on the command line, 1661 // so be sure that the maximum size is consistent. Done 1662 // after call to limit_heap_by_allocatable_memory because that 1663 // method might reduce the allocation size. 1664 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1665 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1666 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1667 } 1668 1669 #ifdef _LP64 1670 if (UseCompressedOops || UseCompressedClassPointers) { 1671 // HeapBaseMinAddress can be greater than default but not less than. 1672 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1673 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1674 // matches compressed oops printing flags 1675 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1676 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1677 DefaultHeapBaseMinAddress, 1678 DefaultHeapBaseMinAddress/G, 1679 HeapBaseMinAddress); 1680 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1681 } 1682 } 1683 } 1684 if (UseCompressedOops) { 1685 // Limit the heap size to the maximum possible when using compressed oops 1686 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1687 1688 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1689 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1690 // but it should be not less than default MaxHeapSize. 1691 max_coop_heap -= HeapBaseMinAddress; 1692 } 1693 1694 // If user specified flags prioritizing os physical 1695 // memory limits, then disable compressed oops if 1696 // limits exceed max_coop_heap and UseCompressedOops 1697 // was not specified. 1698 if (reasonable_max > max_coop_heap) { 1699 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1700 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1701 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1702 "Please check the setting of MaxRAMPercentage %5.2f." 1703 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1704 FLAG_SET_ERGO(UseCompressedOops, false); 1705 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) { 1706 FLAG_SET_ERGO(UseCompressedClassPointers, false); 1707 } 1708 } else { 1709 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1710 } 1711 } 1712 } 1713 #endif // _LP64 1714 1715 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1716 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1717 } 1718 1719 // If the minimum or initial heap_size have not been set or requested to be set 1720 // ergonomically, set them accordingly. 1721 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1722 julong reasonable_minimum = (julong)(OldSize + NewSize); 1723 1724 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1725 1726 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1727 1728 if (InitialHeapSize == 0) { 1729 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1730 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1731 1732 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1733 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1734 1735 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1736 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1737 } 1738 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1739 // synchronize with InitialHeapSize to avoid errors with the default value. 1740 if (MinHeapSize == 0) { 1741 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1742 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1743 } 1744 } 1745 } 1746 1747 // This option inspects the machine and attempts to set various 1748 // parameters to be optimal for long-running, memory allocation 1749 // intensive jobs. It is intended for machines with large 1750 // amounts of cpu and memory. 1751 jint Arguments::set_aggressive_heap_flags() { 1752 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1753 // VM, but we may not be able to represent the total physical memory 1754 // available (like having 8gb of memory on a box but using a 32bit VM). 1755 // Thus, we need to make sure we're using a julong for intermediate 1756 // calculations. 1757 julong initHeapSize; 1758 julong total_memory = os::physical_memory(); 1759 1760 if (total_memory < (julong) 256 * M) { 1761 jio_fprintf(defaultStream::error_stream(), 1762 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1763 vm_exit(1); 1764 } 1765 1766 // The heap size is half of available memory, or (at most) 1767 // all of possible memory less 160mb (leaving room for the OS 1768 // when using ISM). This is the maximum; because adaptive sizing 1769 // is turned on below, the actual space used may be smaller. 1770 1771 initHeapSize = MIN2(total_memory / (julong) 2, 1772 total_memory - (julong) 160 * M); 1773 1774 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1775 1776 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1777 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1778 return JNI_EINVAL; 1779 } 1780 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1781 return JNI_EINVAL; 1782 } 1783 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1784 return JNI_EINVAL; 1785 } 1786 } 1787 if (FLAG_IS_DEFAULT(NewSize)) { 1788 // Make the young generation 3/8ths of the total heap. 1789 if (FLAG_SET_CMDLINE(NewSize, 1790 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1791 return JNI_EINVAL; 1792 } 1793 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1794 return JNI_EINVAL; 1795 } 1796 } 1797 1798 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1799 FLAG_SET_DEFAULT(UseLargePages, true); 1800 #endif 1801 1802 // Increase some data structure sizes for efficiency 1803 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1804 return JNI_EINVAL; 1805 } 1806 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1807 return JNI_EINVAL; 1808 } 1809 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1810 return JNI_EINVAL; 1811 } 1812 1813 // See the OldPLABSize comment below, but replace 'after promotion' 1814 // with 'after copying'. YoungPLABSize is the size of the survivor 1815 // space per-gc-thread buffers. The default is 4kw. 1816 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1817 return JNI_EINVAL; 1818 } 1819 1820 // OldPLABSize is the size of the buffers in the old gen that 1821 // UseParallelGC uses to promote live data that doesn't fit in the 1822 // survivor spaces. At any given time, there's one for each gc thread. 1823 // The default size is 1kw. These buffers are rarely used, since the 1824 // survivor spaces are usually big enough. For specjbb, however, there 1825 // are occasions when there's lots of live data in the young gen 1826 // and we end up promoting some of it. We don't have a definite 1827 // explanation for why bumping OldPLABSize helps, but the theory 1828 // is that a bigger PLAB results in retaining something like the 1829 // original allocation order after promotion, which improves mutator 1830 // locality. A minor effect may be that larger PLABs reduce the 1831 // number of PLAB allocation events during gc. The value of 8kw 1832 // was arrived at by experimenting with specjbb. 1833 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1834 return JNI_EINVAL; 1835 } 1836 1837 // Enable parallel GC and adaptive generation sizing 1838 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1839 return JNI_EINVAL; 1840 } 1841 1842 // Encourage steady state memory management 1843 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1844 return JNI_EINVAL; 1845 } 1846 1847 // This appears to improve mutator locality 1848 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1849 return JNI_EINVAL; 1850 } 1851 1852 return JNI_OK; 1853 } 1854 1855 // This must be called after ergonomics. 1856 void Arguments::set_bytecode_flags() { 1857 if (!RewriteBytecodes) { 1858 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1859 } 1860 } 1861 1862 // Aggressive optimization flags 1863 jint Arguments::set_aggressive_opts_flags() { 1864 #ifdef COMPILER2 1865 if (AggressiveUnboxing) { 1866 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1867 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1868 } else if (!EliminateAutoBox) { 1869 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1870 AggressiveUnboxing = false; 1871 } 1872 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1873 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1874 } else if (!DoEscapeAnalysis) { 1875 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1876 AggressiveUnboxing = false; 1877 } 1878 } 1879 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1880 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1881 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1882 } 1883 // Feed the cache size setting into the JDK 1884 char buffer[1024]; 1885 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1886 if (!add_property(buffer)) { 1887 return JNI_ENOMEM; 1888 } 1889 } 1890 #endif 1891 1892 return JNI_OK; 1893 } 1894 1895 //=========================================================================================================== 1896 // Parsing of java.compiler property 1897 1898 void Arguments::process_java_compiler_argument(const char* arg) { 1899 // For backwards compatibility, Djava.compiler=NONE or "" 1900 // causes us to switch to -Xint mode UNLESS -Xdebug 1901 // is also specified. 1902 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1903 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1904 } 1905 } 1906 1907 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1908 _sun_java_launcher = os::strdup_check_oom(launcher); 1909 } 1910 1911 bool Arguments::created_by_java_launcher() { 1912 assert(_sun_java_launcher != NULL, "property must have value"); 1913 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1914 } 1915 1916 bool Arguments::sun_java_launcher_is_altjvm() { 1917 return _sun_java_launcher_is_altjvm; 1918 } 1919 1920 //=========================================================================================================== 1921 // Parsing of main arguments 1922 1923 unsigned int addreads_count = 0; 1924 unsigned int addexports_count = 0; 1925 unsigned int addopens_count = 0; 1926 unsigned int addmods_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 (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypePassFieldsAsArgs)) { 1974 FLAG_SET_CMDLINE(InlineTypePassFieldsAsArgs, false); 1975 warning("InlineTypePassFieldsAsArgs is not supported on this platform"); 1976 } 1977 1978 if (AMD64_ONLY(false &&) AARCH64_ONLY(false &&) !FLAG_IS_DEFAULT(InlineTypeReturnedAsFields)) { 1979 FLAG_SET_CMDLINE(InlineTypeReturnedAsFields, false); 1980 warning("InlineTypeReturnedAsFields is not supported on this platform"); 1981 } 1982 1983 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) 1984 if (UseHeavyMonitors) { 1985 jio_fprintf(defaultStream::error_stream(), 1986 "UseHeavyMonitors is not fully implemented on this architecture"); 1987 return false; 1988 } 1989 #endif 1990 #if (defined(X86) || defined(PPC64)) && !defined(ZERO) 1991 if (UseHeavyMonitors && UseRTMForStackLocks) { 1992 jio_fprintf(defaultStream::error_stream(), 1993 "-XX:+UseHeavyMonitors and -XX:+UseRTMForStackLocks are mutually exclusive"); 1994 1995 return false; 1996 } 1997 #endif 1998 if (VerifyHeavyMonitors && !UseHeavyMonitors) { 1999 jio_fprintf(defaultStream::error_stream(), 2000 "-XX:+VerifyHeavyMonitors requires -XX:+UseHeavyMonitors"); 2001 return false; 2002 } 2003 2004 return status; 2005 } 2006 2007 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2008 const char* option_type) { 2009 if (ignore) return false; 2010 2011 const char* spacer = " "; 2012 if (option_type == NULL) { 2013 option_type = ++spacer; // Set both to the empty string. 2014 } 2015 2016 jio_fprintf(defaultStream::error_stream(), 2017 "Unrecognized %s%soption: %s\n", option_type, spacer, 2018 option->optionString); 2019 return true; 2020 } 2021 2022 static const char* user_assertion_options[] = { 2023 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2024 }; 2025 2026 static const char* system_assertion_options[] = { 2027 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2028 }; 2029 2030 bool Arguments::parse_uintx(const char* value, 2031 uintx* uintx_arg, 2032 uintx min_size) { 2033 uintx n; 2034 if (!parse_integer(value, &n)) { 2035 return false; 2036 } 2037 if (n >= min_size) { 2038 *uintx_arg = n; 2039 return true; 2040 } else { 2041 return false; 2042 } 2043 } 2044 2045 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2046 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 2047 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2048 char* property = AllocateHeap(prop_len, mtArguments); 2049 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2050 if (ret < 0 || ret >= (int)prop_len) { 2051 FreeHeap(property); 2052 return false; 2053 } 2054 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 2055 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 2056 // that multiple occurrences of the associated flag just causes the existing property value to be 2057 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 2058 // to a property after we have finished flag processing. 2059 bool added = add_property(property, WriteableProperty, internal); 2060 FreeHeap(property); 2061 return added; 2062 } 2063 2064 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2065 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 2066 const unsigned int props_count_limit = 1000; 2067 const int max_digits = 3; 2068 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2069 2070 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2071 if (count < props_count_limit) { 2072 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2073 char* property = AllocateHeap(prop_len, mtArguments); 2074 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2075 if (ret < 0 || ret >= (int)prop_len) { 2076 FreeHeap(property); 2077 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2078 return false; 2079 } 2080 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2081 FreeHeap(property); 2082 return added; 2083 } 2084 2085 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2086 return false; 2087 } 2088 2089 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2090 julong* long_arg, 2091 julong min_size, 2092 julong max_size) { 2093 if (!parse_integer(s, long_arg)) return arg_unreadable; 2094 return check_memory_size(*long_arg, min_size, max_size); 2095 } 2096 2097 // Parse JavaVMInitArgs structure 2098 2099 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 2100 const JavaVMInitArgs *java_tool_options_args, 2101 const JavaVMInitArgs *java_options_args, 2102 const JavaVMInitArgs *cmd_line_args) { 2103 // Save default settings for some mode flags 2104 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2105 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2106 Arguments::_ClipInlining = ClipInlining; 2107 Arguments::_BackgroundCompilation = BackgroundCompilation; 2108 2109 // Remember the default value of SharedBaseAddress. 2110 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 2111 2112 // Setup flags for mixed which is the default 2113 set_mode_flags(_mixed); 2114 2115 // Parse args structure generated from java.base vm options resource 2116 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE); 2117 if (result != JNI_OK) { 2118 return result; 2119 } 2120 2121 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2122 // variable (if present). 2123 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR); 2124 if (result != JNI_OK) { 2125 return result; 2126 } 2127 2128 // Parse args structure generated from the command line flags. 2129 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE); 2130 if (result != JNI_OK) { 2131 return result; 2132 } 2133 2134 // Parse args structure generated from the _JAVA_OPTIONS environment 2135 // variable (if present) (mimics classic VM) 2136 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR); 2137 if (result != JNI_OK) { 2138 return result; 2139 } 2140 2141 // We need to ensure processor and memory resources have been properly 2142 // configured - which may rely on arguments we just processed - before 2143 // doing the final argument processing. Any argument processing that 2144 // needs to know about processor and memory resources must occur after 2145 // this point. 2146 2147 os::init_container_support(); 2148 2149 // Do final processing now that all arguments have been parsed 2150 result = finalize_vm_init_args(); 2151 if (result != JNI_OK) { 2152 return result; 2153 } 2154 2155 return JNI_OK; 2156 } 2157 2158 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2159 // represents a valid JDWP agent. is_path==true denotes that we 2160 // are dealing with -agentpath (case where name is a path), otherwise with 2161 // -agentlib 2162 bool valid_jdwp_agent(char *name, bool is_path) { 2163 char *_name; 2164 const char *_jdwp = "jdwp"; 2165 size_t _len_jdwp, _len_prefix; 2166 2167 if (is_path) { 2168 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2169 return false; 2170 } 2171 2172 _name++; // skip past last path separator 2173 _len_prefix = strlen(JNI_LIB_PREFIX); 2174 2175 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2176 return false; 2177 } 2178 2179 _name += _len_prefix; 2180 _len_jdwp = strlen(_jdwp); 2181 2182 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2183 _name += _len_jdwp; 2184 } 2185 else { 2186 return false; 2187 } 2188 2189 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2190 return false; 2191 } 2192 2193 return true; 2194 } 2195 2196 if (strcmp(name, _jdwp) == 0) { 2197 return true; 2198 } 2199 2200 return false; 2201 } 2202 2203 int Arguments::process_patch_mod_option(const char* patch_mod_tail) { 2204 // --patch-module=<module>=<file>(<pathsep><file>)* 2205 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2206 // Find the equal sign between the module name and the path specification 2207 const char* module_equal = strchr(patch_mod_tail, '='); 2208 if (module_equal == NULL) { 2209 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2210 return JNI_ERR; 2211 } else { 2212 // Pick out the module name 2213 size_t module_len = module_equal - patch_mod_tail; 2214 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2215 if (module_name != NULL) { 2216 memcpy(module_name, patch_mod_tail, module_len); 2217 *(module_name + module_len) = '\0'; 2218 // The path piece begins one past the module_equal sign 2219 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */); 2220 FREE_C_HEAP_ARRAY(char, module_name); 2221 } else { 2222 return JNI_ENOMEM; 2223 } 2224 } 2225 return JNI_OK; 2226 } 2227 2228 // VALUECLASS_STR must match string used in the build 2229 #define VALUECLASS_STR "valueclasses" 2230 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar" 2231 2232 // Finalize --patch-module args and --enable-preview related to value class module patches. 2233 // Create all numbered properties passing module patches. 2234 int Arguments::finalize_patch_module() { 2235 // If --enable-preview and EnableValhalla is true, each module may have value classes that 2236 // are to be patched into the module. 2237 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/ 2238 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar 2239 if (enable_preview() && EnableValhalla) { 2240 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2241 const char * fileSep = os::file_separator(); 2242 2243 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s", 2244 Arguments::get_java_home(), fileSep, fileSep, fileSep); 2245 DIR* dir = os::opendir(valueclasses_dir); 2246 if (dir != nullptr) { 2247 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2248 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2249 2250 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) { 2251 // Test if file ends-with "-valueclasses.jar" 2252 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1); 2253 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) { 2254 continue; // too short or not the expected suffix 2255 } 2256 2257 strcpy(module_name, entry->d_name); 2258 module_name[len] = '\0'; // truncate to just module-name 2259 2260 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name); 2261 add_patch_mod_prefix(module_name, path, true /* append */); 2262 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name); 2263 } 2264 FreeHeap(module_name); 2265 FreeHeap(path); 2266 os::closedir(dir); 2267 } 2268 FreeHeap(valueclasses_dir); 2269 } 2270 2271 // Create numbered properties for each module that has been patched either 2272 // by --patch-module or --enable-preview 2273 // Format is "jdk.module.patch.<n>=<module_name>=<path>" 2274 if (_patch_mod_prefix != nullptr) { 2275 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments); 2276 unsigned int patch_mod_count = 0; 2277 2278 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin(); 2279 it != _patch_mod_prefix->end(); ++it) { 2280 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s", 2281 (*it)->module_name(), (*it)->path_string()); 2282 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) { 2283 FreeHeap(prop_value); 2284 return JNI_ENOMEM; 2285 } 2286 } 2287 FreeHeap(prop_value); 2288 } 2289 return JNI_OK; 2290 } 2291 2292 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2293 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2294 // The min and max sizes match the values in globals.hpp, but scaled 2295 // with K. The values have been chosen so that alignment with page 2296 // size doesn't change the max value, which makes the conversions 2297 // back and forth between Xss value and ThreadStackSize value easier. 2298 // The values have also been chosen to fit inside a 32-bit signed type. 2299 const julong min_ThreadStackSize = 0; 2300 const julong max_ThreadStackSize = 1 * M; 2301 2302 // Make sure the above values match the range set in globals.hpp 2303 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2304 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2305 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2306 2307 const julong min_size = min_ThreadStackSize * K; 2308 const julong max_size = max_ThreadStackSize * K; 2309 2310 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2311 2312 julong size = 0; 2313 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2314 if (errcode != arg_in_range) { 2315 bool silent = (option == NULL); // Allow testing to silence error messages 2316 if (!silent) { 2317 jio_fprintf(defaultStream::error_stream(), 2318 "Invalid thread stack size: %s\n", option->optionString); 2319 describe_range_error(errcode); 2320 } 2321 return JNI_EINVAL; 2322 } 2323 2324 // Internally track ThreadStackSize in units of 1024 bytes. 2325 const julong size_aligned = align_up(size, K); 2326 assert(size <= size_aligned, 2327 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2328 size, size_aligned); 2329 2330 const julong size_in_K = size_aligned / K; 2331 assert(size_in_K < (julong)max_intx, 2332 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2333 size_in_K); 2334 2335 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2336 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2337 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2338 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2339 max_expanded, size_in_K); 2340 2341 *out_ThreadStackSize = (intx)size_in_K; 2342 2343 return JNI_OK; 2344 } 2345 2346 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) { 2347 // For match_option to return remaining or value part of option string 2348 const char* tail; 2349 2350 // iterate over arguments 2351 for (int index = 0; index < args->nOptions; index++) { 2352 bool is_absolute_path = false; // for -agentpath vs -agentlib 2353 2354 const JavaVMOption* option = args->options + index; 2355 2356 if (!match_option(option, "-Djava.class.path", &tail) && 2357 !match_option(option, "-Dsun.java.command", &tail) && 2358 !match_option(option, "-Dsun.java.launcher", &tail)) { 2359 2360 // add all jvm options to the jvm_args string. This string 2361 // is used later to set the java.vm.args PerfData string constant. 2362 // the -Djava.class.path and the -Dsun.java.command options are 2363 // omitted from jvm_args string as each have their own PerfData 2364 // string constant object. 2365 build_jvm_args(option->optionString); 2366 } 2367 2368 // -verbose:[class/module/gc/jni] 2369 if (match_option(option, "-verbose", &tail)) { 2370 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2371 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2372 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2373 } else if (!strcmp(tail, ":module")) { 2374 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2375 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2376 } else if (!strcmp(tail, ":gc")) { 2377 if (_legacyGCLogging.lastFlag == 0) { 2378 _legacyGCLogging.lastFlag = 1; 2379 } 2380 } else if (!strcmp(tail, ":jni")) { 2381 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2382 } 2383 // -da / -ea / -disableassertions / -enableassertions 2384 // These accept an optional class/package name separated by a colon, e.g., 2385 // -da:java.lang.Thread. 2386 } else if (match_option(option, user_assertion_options, &tail, true)) { 2387 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2388 if (*tail == '\0') { 2389 JavaAssertions::setUserClassDefault(enable); 2390 } else { 2391 assert(*tail == ':', "bogus match by match_option()"); 2392 JavaAssertions::addOption(tail + 1, enable); 2393 } 2394 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2395 } else if (match_option(option, system_assertion_options, &tail, false)) { 2396 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2397 JavaAssertions::setSystemClassDefault(enable); 2398 // -bootclasspath: 2399 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2400 jio_fprintf(defaultStream::output_stream(), 2401 "-Xbootclasspath is no longer a supported option.\n"); 2402 return JNI_EINVAL; 2403 // -bootclasspath/a: 2404 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2405 Arguments::append_sysclasspath(tail); 2406 #if INCLUDE_CDS 2407 MetaspaceShared::disable_optimized_module_handling(); 2408 log_info(cds)("optimized module handling: disabled because bootclasspath was appended"); 2409 #endif 2410 // -bootclasspath/p: 2411 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2412 jio_fprintf(defaultStream::output_stream(), 2413 "-Xbootclasspath/p is no longer a supported option.\n"); 2414 return JNI_EINVAL; 2415 // -Xrun 2416 } else if (match_option(option, "-Xrun", &tail)) { 2417 if (tail != NULL) { 2418 const char* pos = strchr(tail, ':'); 2419 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2420 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2421 jio_snprintf(name, len + 1, "%s", tail); 2422 2423 char *options = NULL; 2424 if(pos != NULL) { 2425 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2426 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2427 } 2428 #if !INCLUDE_JVMTI 2429 if (strcmp(name, "jdwp") == 0) { 2430 jio_fprintf(defaultStream::error_stream(), 2431 "Debugging agents are not supported in this VM\n"); 2432 return JNI_ERR; 2433 } 2434 #endif // !INCLUDE_JVMTI 2435 add_init_library(name, options); 2436 } 2437 } else if (match_option(option, "--add-reads=", &tail)) { 2438 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2439 return JNI_ENOMEM; 2440 } 2441 } else if (match_option(option, "--add-exports=", &tail)) { 2442 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2443 return JNI_ENOMEM; 2444 } 2445 } else if (match_option(option, "--add-opens=", &tail)) { 2446 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2447 return JNI_ENOMEM; 2448 } 2449 } else if (match_option(option, "--add-modules=", &tail)) { 2450 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2451 return JNI_ENOMEM; 2452 } 2453 } else if (match_option(option, "--enable-native-access=", &tail)) { 2454 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2455 return JNI_ENOMEM; 2456 } 2457 } else if (match_option(option, "--limit-modules=", &tail)) { 2458 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2459 return JNI_ENOMEM; 2460 } 2461 } else if (match_option(option, "--module-path=", &tail)) { 2462 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2463 return JNI_ENOMEM; 2464 } 2465 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2466 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2467 return JNI_ENOMEM; 2468 } 2469 } else if (match_option(option, "--patch-module=", &tail)) { 2470 // --patch-module=<module>=<file>(<pathsep><file>)* 2471 int res = process_patch_mod_option(tail); 2472 if (res != JNI_OK) { 2473 return res; 2474 } 2475 } else if (match_option(option, "--illegal-access=", &tail)) { 2476 char version[256]; 2477 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2478 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2479 // -agentlib and -agentpath 2480 } else if (match_option(option, "-agentlib:", &tail) || 2481 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2482 if(tail != NULL) { 2483 const char* pos = strchr(tail, '='); 2484 char* name; 2485 if (pos == NULL) { 2486 name = os::strdup_check_oom(tail, mtArguments); 2487 } else { 2488 size_t len = pos - tail; 2489 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2490 memcpy(name, tail, len); 2491 name[len] = '\0'; 2492 } 2493 2494 char *options = NULL; 2495 if(pos != NULL) { 2496 options = os::strdup_check_oom(pos + 1, mtArguments); 2497 } 2498 #if !INCLUDE_JVMTI 2499 if (valid_jdwp_agent(name, is_absolute_path)) { 2500 jio_fprintf(defaultStream::error_stream(), 2501 "Debugging agents are not supported in this VM\n"); 2502 return JNI_ERR; 2503 } 2504 #endif // !INCLUDE_JVMTI 2505 add_init_agent(name, options, is_absolute_path); 2506 } 2507 // -javaagent 2508 } else if (match_option(option, "-javaagent:", &tail)) { 2509 #if !INCLUDE_JVMTI 2510 jio_fprintf(defaultStream::error_stream(), 2511 "Instrumentation agents are not supported in this VM\n"); 2512 return JNI_ERR; 2513 #else 2514 if (tail != NULL) { 2515 size_t length = strlen(tail) + 1; 2516 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2517 jio_snprintf(options, length, "%s", tail); 2518 add_instrument_agent("instrument", options, false); 2519 // java agents need module java.instrument 2520 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2521 return JNI_ENOMEM; 2522 } 2523 } 2524 #endif // !INCLUDE_JVMTI 2525 // --enable_preview 2526 } else if (match_option(option, "--enable-preview")) { 2527 set_enable_preview(); 2528 // -Xnoclassgc 2529 } else if (match_option(option, "-Xnoclassgc")) { 2530 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2531 return JNI_EINVAL; 2532 } 2533 // -Xbatch 2534 } else if (match_option(option, "-Xbatch")) { 2535 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2536 return JNI_EINVAL; 2537 } 2538 // -Xmn for compatibility with other JVM vendors 2539 } else if (match_option(option, "-Xmn", &tail)) { 2540 julong long_initial_young_size = 0; 2541 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2542 if (errcode != arg_in_range) { 2543 jio_fprintf(defaultStream::error_stream(), 2544 "Invalid initial young generation size: %s\n", option->optionString); 2545 describe_range_error(errcode); 2546 return JNI_EINVAL; 2547 } 2548 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2549 return JNI_EINVAL; 2550 } 2551 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2552 return JNI_EINVAL; 2553 } 2554 // -Xms 2555 } else if (match_option(option, "-Xms", &tail)) { 2556 julong size = 0; 2557 // an initial heap size of 0 means automatically determine 2558 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2559 if (errcode != arg_in_range) { 2560 jio_fprintf(defaultStream::error_stream(), 2561 "Invalid initial heap size: %s\n", option->optionString); 2562 describe_range_error(errcode); 2563 return JNI_EINVAL; 2564 } 2565 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2566 return JNI_EINVAL; 2567 } 2568 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2569 return JNI_EINVAL; 2570 } 2571 // -Xmx 2572 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2573 julong long_max_heap_size = 0; 2574 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2575 if (errcode != arg_in_range) { 2576 jio_fprintf(defaultStream::error_stream(), 2577 "Invalid maximum heap size: %s\n", option->optionString); 2578 describe_range_error(errcode); 2579 return JNI_EINVAL; 2580 } 2581 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2582 return JNI_EINVAL; 2583 } 2584 // Xmaxf 2585 } else if (match_option(option, "-Xmaxf", &tail)) { 2586 char* err; 2587 int maxf = (int)(strtod(tail, &err) * 100); 2588 if (*err != '\0' || *tail == '\0') { 2589 jio_fprintf(defaultStream::error_stream(), 2590 "Bad max heap free percentage size: %s\n", 2591 option->optionString); 2592 return JNI_EINVAL; 2593 } else { 2594 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2595 return JNI_EINVAL; 2596 } 2597 } 2598 // Xminf 2599 } else if (match_option(option, "-Xminf", &tail)) { 2600 char* err; 2601 int minf = (int)(strtod(tail, &err) * 100); 2602 if (*err != '\0' || *tail == '\0') { 2603 jio_fprintf(defaultStream::error_stream(), 2604 "Bad min heap free percentage size: %s\n", 2605 option->optionString); 2606 return JNI_EINVAL; 2607 } else { 2608 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2609 return JNI_EINVAL; 2610 } 2611 } 2612 // -Xss 2613 } else if (match_option(option, "-Xss", &tail)) { 2614 intx value = 0; 2615 jint err = parse_xss(option, tail, &value); 2616 if (err != JNI_OK) { 2617 return err; 2618 } 2619 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2620 return JNI_EINVAL; 2621 } 2622 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2623 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2624 julong long_ReservedCodeCacheSize = 0; 2625 2626 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2627 if (errcode != arg_in_range) { 2628 jio_fprintf(defaultStream::error_stream(), 2629 "Invalid maximum code cache size: %s.\n", option->optionString); 2630 return JNI_EINVAL; 2631 } 2632 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2633 return JNI_EINVAL; 2634 } 2635 // -green 2636 } else if (match_option(option, "-green")) { 2637 jio_fprintf(defaultStream::error_stream(), 2638 "Green threads support not available\n"); 2639 return JNI_EINVAL; 2640 // -native 2641 } else if (match_option(option, "-native")) { 2642 // HotSpot always uses native threads, ignore silently for compatibility 2643 // -Xrs 2644 } else if (match_option(option, "-Xrs")) { 2645 // Classic/EVM option, new functionality 2646 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2647 return JNI_EINVAL; 2648 } 2649 // -Xprof 2650 } else if (match_option(option, "-Xprof")) { 2651 char version[256]; 2652 // Obsolete in JDK 10 2653 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2654 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2655 // -Xinternalversion 2656 } else if (match_option(option, "-Xinternalversion")) { 2657 jio_fprintf(defaultStream::output_stream(), "%s\n", 2658 VM_Version::internal_vm_info_string()); 2659 vm_exit(0); 2660 #ifndef PRODUCT 2661 // -Xprintflags 2662 } else if (match_option(option, "-Xprintflags")) { 2663 JVMFlag::printFlags(tty, false); 2664 vm_exit(0); 2665 #endif 2666 // -D 2667 } else if (match_option(option, "-D", &tail)) { 2668 const char* value; 2669 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2670 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2671 // abort if -Djava.endorsed.dirs is set 2672 jio_fprintf(defaultStream::output_stream(), 2673 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2674 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2675 return JNI_EINVAL; 2676 } 2677 if (match_option(option, "-Djava.ext.dirs=", &value) && 2678 *value != '\0' && strcmp(value, "\"\"") != 0) { 2679 // abort if -Djava.ext.dirs is set 2680 jio_fprintf(defaultStream::output_stream(), 2681 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2682 return JNI_EINVAL; 2683 } 2684 // Check for module related properties. They must be set using the modules 2685 // options. For example: use "--add-modules=java.sql", not 2686 // "-Djdk.module.addmods=java.sql" 2687 if (is_internal_module_property(option->optionString + 2)) { 2688 needs_module_property_warning = true; 2689 continue; 2690 } 2691 if (!add_property(tail)) { 2692 return JNI_ENOMEM; 2693 } 2694 // Out of the box management support 2695 if (match_option(option, "-Dcom.sun.management", &tail)) { 2696 #if INCLUDE_MANAGEMENT 2697 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2698 return JNI_EINVAL; 2699 } 2700 // management agent in module jdk.management.agent 2701 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2702 return JNI_ENOMEM; 2703 } 2704 #else 2705 jio_fprintf(defaultStream::output_stream(), 2706 "-Dcom.sun.management is not supported in this VM.\n"); 2707 return JNI_ERR; 2708 #endif 2709 } 2710 // -Xint 2711 } else if (match_option(option, "-Xint")) { 2712 set_mode_flags(_int); 2713 // -Xmixed 2714 } else if (match_option(option, "-Xmixed")) { 2715 set_mode_flags(_mixed); 2716 // -Xcomp 2717 } else if (match_option(option, "-Xcomp")) { 2718 // for testing the compiler; turn off all flags that inhibit compilation 2719 set_mode_flags(_comp); 2720 // -Xshare:dump 2721 } else if (match_option(option, "-Xshare:dump")) { 2722 DumpSharedSpaces = true; 2723 // -Xshare:on 2724 } else if (match_option(option, "-Xshare:on")) { 2725 UseSharedSpaces = true; 2726 RequireSharedSpaces = true; 2727 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2728 } else if (match_option(option, "-Xshare:auto")) { 2729 UseSharedSpaces = true; 2730 RequireSharedSpaces = false; 2731 xshare_auto_cmd_line = true; 2732 // -Xshare:off 2733 } else if (match_option(option, "-Xshare:off")) { 2734 UseSharedSpaces = false; 2735 RequireSharedSpaces = false; 2736 // -Xverify 2737 } else if (match_option(option, "-Xverify", &tail)) { 2738 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2739 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2740 return JNI_EINVAL; 2741 } 2742 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2743 return JNI_EINVAL; 2744 } 2745 } else if (strcmp(tail, ":remote") == 0) { 2746 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2747 return JNI_EINVAL; 2748 } 2749 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2750 return JNI_EINVAL; 2751 } 2752 } else if (strcmp(tail, ":none") == 0) { 2753 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2754 return JNI_EINVAL; 2755 } 2756 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2757 return JNI_EINVAL; 2758 } 2759 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2760 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2761 return JNI_EINVAL; 2762 } 2763 // -Xdebug 2764 } else if (match_option(option, "-Xdebug")) { 2765 // note this flag has been used, then ignore 2766 set_xdebug_mode(true); 2767 // -Xnoagent 2768 } else if (match_option(option, "-Xnoagent")) { 2769 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2770 } else if (match_option(option, "-Xloggc:", &tail)) { 2771 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2772 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2773 _legacyGCLogging.lastFlag = 2; 2774 _legacyGCLogging.file = os::strdup_check_oom(tail); 2775 } else if (match_option(option, "-Xlog", &tail)) { 2776 bool ret = false; 2777 if (strcmp(tail, ":help") == 0) { 2778 fileStream stream(defaultStream::output_stream()); 2779 LogConfiguration::print_command_line_help(&stream); 2780 vm_exit(0); 2781 } else if (strcmp(tail, ":disable") == 0) { 2782 LogConfiguration::disable_logging(); 2783 ret = true; 2784 } else if (strcmp(tail, ":async") == 0) { 2785 LogConfiguration::set_async_mode(true); 2786 ret = true; 2787 } else if (*tail == '\0') { 2788 ret = LogConfiguration::parse_command_line_arguments(); 2789 assert(ret, "-Xlog without arguments should never fail to parse"); 2790 } else if (*tail == ':') { 2791 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2792 } 2793 if (ret == false) { 2794 jio_fprintf(defaultStream::error_stream(), 2795 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2796 tail); 2797 return JNI_EINVAL; 2798 } 2799 // JNI hooks 2800 } else if (match_option(option, "-Xcheck", &tail)) { 2801 if (!strcmp(tail, ":jni")) { 2802 #if !INCLUDE_JNI_CHECK 2803 warning("JNI CHECKING is not supported in this VM"); 2804 #else 2805 CheckJNICalls = true; 2806 #endif // INCLUDE_JNI_CHECK 2807 } else if (is_bad_option(option, args->ignoreUnrecognized, 2808 "check")) { 2809 return JNI_EINVAL; 2810 } 2811 } else if (match_option(option, "vfprintf")) { 2812 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2813 } else if (match_option(option, "exit")) { 2814 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2815 } else if (match_option(option, "abort")) { 2816 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2817 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2818 // and the last option wins. 2819 } else if (match_option(option, "-XX:+NeverTenure")) { 2820 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2821 return JNI_EINVAL; 2822 } 2823 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2824 return JNI_EINVAL; 2825 } 2826 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2827 return JNI_EINVAL; 2828 } 2829 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2830 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2831 return JNI_EINVAL; 2832 } 2833 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2834 return JNI_EINVAL; 2835 } 2836 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2837 return JNI_EINVAL; 2838 } 2839 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2840 uintx max_tenuring_thresh = 0; 2841 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2842 jio_fprintf(defaultStream::error_stream(), 2843 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2844 return JNI_EINVAL; 2845 } 2846 2847 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2848 return JNI_EINVAL; 2849 } 2850 2851 if (MaxTenuringThreshold == 0) { 2852 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2853 return JNI_EINVAL; 2854 } 2855 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2856 return JNI_EINVAL; 2857 } 2858 } else { 2859 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2860 return JNI_EINVAL; 2861 } 2862 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2863 return JNI_EINVAL; 2864 } 2865 } 2866 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2867 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2868 return JNI_EINVAL; 2869 } 2870 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2871 return JNI_EINVAL; 2872 } 2873 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2874 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2875 return JNI_EINVAL; 2876 } 2877 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2878 return JNI_EINVAL; 2879 } 2880 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2881 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2882 return JNI_EINVAL; 2883 } 2884 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2885 return JNI_EINVAL; 2886 } 2887 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2888 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2889 return JNI_EINVAL; 2890 } 2891 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2892 return JNI_EINVAL; 2893 } 2894 } else if (match_option(option, "--finalization=", &tail)) { 2895 if (strcmp(tail, "enabled") == 0) { 2896 InstanceKlass::set_finalization_enabled(true); 2897 } else if (strcmp(tail, "disabled") == 0) { 2898 InstanceKlass::set_finalization_enabled(false); 2899 } else { 2900 jio_fprintf(defaultStream::error_stream(), 2901 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2902 tail); 2903 return JNI_EINVAL; 2904 } 2905 #if !defined(DTRACE_ENABLED) 2906 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2907 jio_fprintf(defaultStream::error_stream(), 2908 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2909 return JNI_EINVAL; 2910 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2911 jio_fprintf(defaultStream::error_stream(), 2912 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2913 return JNI_EINVAL; 2914 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2915 jio_fprintf(defaultStream::error_stream(), 2916 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2917 return JNI_EINVAL; 2918 #endif // !defined(DTRACE_ENABLED) 2919 #ifdef ASSERT 2920 } else if (match_option(option, "-XX:+FullGCALot")) { 2921 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2922 return JNI_EINVAL; 2923 } 2924 // disable scavenge before parallel mark-compact 2925 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2926 return JNI_EINVAL; 2927 } 2928 #endif 2929 #if !INCLUDE_MANAGEMENT 2930 } else if (match_option(option, "-XX:+ManagementServer")) { 2931 jio_fprintf(defaultStream::error_stream(), 2932 "ManagementServer is not supported in this VM.\n"); 2933 return JNI_ERR; 2934 #endif // INCLUDE_MANAGEMENT 2935 #if INCLUDE_JVMCI 2936 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) { 2937 if (EnableJVMCIProduct) { 2938 jio_fprintf(defaultStream::error_stream(), 2939 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n"); 2940 return JNI_EINVAL; 2941 } 2942 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) { 2943 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before 2944 if (EnableJVMCIProduct) { 2945 continue; 2946 } 2947 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2948 // Allow this flag if it has been unlocked. 2949 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) { 2950 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) { 2951 jio_fprintf(defaultStream::error_stream(), 2952 "Unable to enable JVMCI in product mode"); 2953 return JNI_ERR; 2954 } 2955 } 2956 // The flag was locked so process normally to report that error 2957 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2958 return JNI_EINVAL; 2959 } 2960 #endif // INCLUDE_JVMCI 2961 #if INCLUDE_JFR 2962 } else if (match_jfr_option(&option)) { 2963 return JNI_EINVAL; 2964 #endif 2965 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2966 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2967 // already been handled 2968 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2969 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2970 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2971 return JNI_EINVAL; 2972 } 2973 } 2974 // Unknown option 2975 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2976 return JNI_ERR; 2977 } 2978 } 2979 2980 if (!EnableValhalla && EnablePrimitiveClasses) { 2981 jio_fprintf(defaultStream::error_stream(), 2982 "Cannot specify -XX:+EnablePrimitiveClasses without -XX:+EnableValhalla"); 2983 return JNI_EINVAL; 2984 } 2985 2986 // PrintSharedArchiveAndExit will turn on 2987 // -Xshare:on 2988 // -Xlog:class+path=info 2989 if (PrintSharedArchiveAndExit) { 2990 UseSharedSpaces = true; 2991 RequireSharedSpaces = true; 2992 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2993 } 2994 2995 fix_appclasspath(); 2996 2997 return JNI_OK; 2998 } 2999 3000 bool match_module(void *module_name, ModulePatchPath *patch) { 3001 return (strcmp((char *)module_name, patch->module_name()) == 0); 3002 } 3003 3004 bool Arguments::patch_mod_javabase() { 3005 return _patch_mod_prefix != nullptr && _patch_mod_prefix->find((void*)JAVA_BASE_NAME, match_module) >= 0; 3006 } 3007 3008 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append) { 3009 // Create GrowableArray lazily, only if --patch-module has been specified 3010 if (_patch_mod_prefix == nullptr) { 3011 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 3012 } 3013 3014 // Scan patches for matching module 3015 int i = _patch_mod_prefix->find((void*)module_name, match_module); 3016 if (i == -1) { 3017 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3018 } else { 3019 if (allow_append) { 3020 // append path to existing module entry 3021 _patch_mod_prefix->at(i)->append_path(path); 3022 } else { 3023 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3024 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3025 } else { 3026 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name); 3027 } 3028 } 3029 } 3030 } 3031 3032 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3033 // 3034 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3035 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3036 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3037 // path is treated as the current directory. 3038 // 3039 // This causes problems with CDS, which requires that all directories specified in the classpath 3040 // must be empty. In most cases, applications do NOT want to load classes from the current 3041 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3042 // scripts compatible with CDS. 3043 void Arguments::fix_appclasspath() { 3044 if (IgnoreEmptyClassPaths) { 3045 const char separator = *os::path_separator(); 3046 const char* src = _java_class_path->value(); 3047 3048 // skip over all the leading empty paths 3049 while (*src == separator) { 3050 src ++; 3051 } 3052 3053 char* copy = os::strdup_check_oom(src, mtArguments); 3054 3055 // trim all trailing empty paths 3056 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3057 *tail = '\0'; 3058 } 3059 3060 char from[3] = {separator, separator, '\0'}; 3061 char to [2] = {separator, '\0'}; 3062 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3063 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3064 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3065 } 3066 3067 _java_class_path->set_writeable_value(copy); 3068 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3069 } 3070 } 3071 3072 jint Arguments::finalize_vm_init_args() { 3073 // check if the default lib/endorsed directory exists; if so, error 3074 char path[JVM_MAXPATHLEN]; 3075 const char* fileSep = os::file_separator(); 3076 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3077 3078 DIR* dir = os::opendir(path); 3079 if (dir != NULL) { 3080 jio_fprintf(defaultStream::output_stream(), 3081 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3082 "in modular form will be supported via the concept of upgradeable modules.\n"); 3083 os::closedir(dir); 3084 return JNI_ERR; 3085 } 3086 3087 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3088 dir = os::opendir(path); 3089 if (dir != NULL) { 3090 jio_fprintf(defaultStream::output_stream(), 3091 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3092 "Use -classpath instead.\n."); 3093 os::closedir(dir); 3094 return JNI_ERR; 3095 } 3096 3097 // This must be done after all arguments have been processed 3098 // and the container support has been initialized since AggressiveHeap 3099 // relies on the amount of total memory available. 3100 if (AggressiveHeap) { 3101 jint result = set_aggressive_heap_flags(); 3102 if (result != JNI_OK) { 3103 return result; 3104 } 3105 } 3106 3107 // This must be done after all arguments have been processed. 3108 // java_compiler() true means set to "NONE" or empty. 3109 if (java_compiler() && !xdebug_mode()) { 3110 // For backwards compatibility, we switch to interpreted mode if 3111 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3112 // not specified. 3113 set_mode_flags(_int); 3114 } 3115 3116 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3117 // but like -Xint, leave compilation thresholds unaffected. 3118 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3119 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3120 set_mode_flags(_int); 3121 } 3122 3123 #ifdef ZERO 3124 // Zero always runs in interpreted mode 3125 set_mode_flags(_int); 3126 #endif 3127 3128 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3129 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3130 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3131 } 3132 3133 #if !COMPILER2_OR_JVMCI 3134 // Don't degrade server performance for footprint 3135 if (FLAG_IS_DEFAULT(UseLargePages) && 3136 MaxHeapSize < LargePageHeapSizeThreshold) { 3137 // No need for large granularity pages w/small heaps. 3138 // Note that large pages are enabled/disabled for both the 3139 // Java heap and the code cache. 3140 FLAG_SET_DEFAULT(UseLargePages, false); 3141 } 3142 3143 UNSUPPORTED_OPTION(ProfileInterpreter); 3144 #endif 3145 3146 // Parse the CompilationMode flag 3147 if (!CompilationModeFlag::initialize()) { 3148 return JNI_ERR; 3149 } 3150 3151 if (!check_vm_args_consistency()) { 3152 return JNI_ERR; 3153 } 3154 3155 // finalize --module-patch and related --enable-preview 3156 if (finalize_patch_module() != JNI_OK) { 3157 return JNI_ERR; 3158 } 3159 3160 #if INCLUDE_CDS 3161 if (DumpSharedSpaces) { 3162 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3163 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable 3164 // compiler just to be safe. 3165 // 3166 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the 3167 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler. 3168 // TODO: revisit the following for the static archive case. 3169 set_mode_flags(_int); 3170 } 3171 3172 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit 3173 if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) { 3174 jio_fprintf(defaultStream::output_stream(), 3175 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n"); 3176 return JNI_ERR; 3177 } 3178 3179 if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) { 3180 DynamicDumpSharedSpaces = false; 3181 } else { 3182 DynamicDumpSharedSpaces = true; 3183 } 3184 3185 if (AutoCreateSharedArchive) { 3186 if (SharedArchiveFile == NULL) { 3187 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile"); 3188 return JNI_ERR; 3189 } 3190 if (ArchiveClassesAtExit != NULL) { 3191 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit"); 3192 return JNI_ERR; 3193 } 3194 } 3195 3196 if (UseSharedSpaces && patch_mod_javabase()) { 3197 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3198 } 3199 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3200 UseSharedSpaces = false; 3201 } 3202 3203 if (DumpSharedSpaces || DynamicDumpSharedSpaces) { 3204 // Always verify non-system classes during CDS dump 3205 if (!BytecodeVerificationRemote) { 3206 BytecodeVerificationRemote = true; 3207 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3208 } 3209 } 3210 #endif 3211 3212 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3213 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3214 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3215 3216 return JNI_OK; 3217 } 3218 3219 // Helper class for controlling the lifetime of JavaVMInitArgs 3220 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3221 // deleted on the destruction of the ScopedVMInitArgs object. 3222 class ScopedVMInitArgs : public StackObj { 3223 private: 3224 JavaVMInitArgs _args; 3225 char* _container_name; 3226 bool _is_set; 3227 char* _vm_options_file_arg; 3228 3229 public: 3230 ScopedVMInitArgs(const char *container_name) { 3231 _args.version = JNI_VERSION_1_2; 3232 _args.nOptions = 0; 3233 _args.options = NULL; 3234 _args.ignoreUnrecognized = false; 3235 _container_name = (char *)container_name; 3236 _is_set = false; 3237 _vm_options_file_arg = NULL; 3238 } 3239 3240 // Populates the JavaVMInitArgs object represented by this 3241 // ScopedVMInitArgs object with the arguments in options. The 3242 // allocated memory is deleted by the destructor. If this method 3243 // returns anything other than JNI_OK, then this object is in a 3244 // partially constructed state, and should be abandoned. 3245 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3246 _is_set = true; 3247 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3248 JavaVMOption, options->length(), mtArguments); 3249 if (options_arr == NULL) { 3250 return JNI_ENOMEM; 3251 } 3252 _args.options = options_arr; 3253 3254 for (int i = 0; i < options->length(); i++) { 3255 options_arr[i] = options->at(i); 3256 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3257 if (options_arr[i].optionString == NULL) { 3258 // Rely on the destructor to do cleanup. 3259 _args.nOptions = i; 3260 return JNI_ENOMEM; 3261 } 3262 } 3263 3264 _args.nOptions = options->length(); 3265 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3266 return JNI_OK; 3267 } 3268 3269 JavaVMInitArgs* get() { return &_args; } 3270 char* container_name() { return _container_name; } 3271 bool is_set() { return _is_set; } 3272 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3273 char* vm_options_file_arg() { return _vm_options_file_arg; } 3274 3275 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3276 if (_vm_options_file_arg != NULL) { 3277 os::free(_vm_options_file_arg); 3278 } 3279 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3280 } 3281 3282 ~ScopedVMInitArgs() { 3283 if (_vm_options_file_arg != NULL) { 3284 os::free(_vm_options_file_arg); 3285 } 3286 if (_args.options == NULL) return; 3287 for (int i = 0; i < _args.nOptions; i++) { 3288 os::free(_args.options[i].optionString); 3289 } 3290 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3291 } 3292 3293 // Insert options into this option list, to replace option at 3294 // vm_options_file_pos (-XX:VMOptionsFile) 3295 jint insert(const JavaVMInitArgs* args, 3296 const JavaVMInitArgs* args_to_insert, 3297 const int vm_options_file_pos) { 3298 assert(_args.options == NULL, "shouldn't be set yet"); 3299 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3300 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3301 3302 int length = args->nOptions + args_to_insert->nOptions - 1; 3303 // Construct new option array 3304 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3305 for (int i = 0; i < args->nOptions; i++) { 3306 if (i == vm_options_file_pos) { 3307 // insert the new options starting at the same place as the 3308 // -XX:VMOptionsFile option 3309 for (int j = 0; j < args_to_insert->nOptions; j++) { 3310 options.push(args_to_insert->options[j]); 3311 } 3312 } else { 3313 options.push(args->options[i]); 3314 } 3315 } 3316 // make into options array 3317 return set_args(&options); 3318 } 3319 }; 3320 3321 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3322 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3323 } 3324 3325 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3326 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3327 } 3328 3329 jint Arguments::parse_options_environment_variable(const char* name, 3330 ScopedVMInitArgs* vm_args) { 3331 char *buffer = ::getenv(name); 3332 3333 // Don't check this environment variable if user has special privileges 3334 // (e.g. unix su command). 3335 if (buffer == NULL || os::have_special_privileges()) { 3336 return JNI_OK; 3337 } 3338 3339 if ((buffer = os::strdup(buffer)) == NULL) { 3340 return JNI_ENOMEM; 3341 } 3342 3343 jio_fprintf(defaultStream::error_stream(), 3344 "Picked up %s: %s\n", name, buffer); 3345 3346 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3347 3348 os::free(buffer); 3349 return retcode; 3350 } 3351 3352 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3353 // read file into buffer 3354 int fd = ::open(file_name, O_RDONLY); 3355 if (fd < 0) { 3356 jio_fprintf(defaultStream::error_stream(), 3357 "Could not open options file '%s'\n", 3358 file_name); 3359 return JNI_ERR; 3360 } 3361 3362 struct stat stbuf; 3363 int retcode = os::stat(file_name, &stbuf); 3364 if (retcode != 0) { 3365 jio_fprintf(defaultStream::error_stream(), 3366 "Could not stat options file '%s'\n", 3367 file_name); 3368 ::close(fd); 3369 return JNI_ERR; 3370 } 3371 3372 if (stbuf.st_size == 0) { 3373 // tell caller there is no option data and that is ok 3374 ::close(fd); 3375 return JNI_OK; 3376 } 3377 3378 // '+ 1' for NULL termination even with max bytes 3379 size_t bytes_alloc = stbuf.st_size + 1; 3380 3381 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3382 if (NULL == buf) { 3383 jio_fprintf(defaultStream::error_stream(), 3384 "Could not allocate read buffer for options file parse\n"); 3385 ::close(fd); 3386 return JNI_ENOMEM; 3387 } 3388 3389 memset(buf, 0, bytes_alloc); 3390 3391 // Fill buffer 3392 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3393 ::close(fd); 3394 if (bytes_read < 0) { 3395 FREE_C_HEAP_ARRAY(char, buf); 3396 jio_fprintf(defaultStream::error_stream(), 3397 "Could not read options file '%s'\n", file_name); 3398 return JNI_ERR; 3399 } 3400 3401 if (bytes_read == 0) { 3402 // tell caller there is no option data and that is ok 3403 FREE_C_HEAP_ARRAY(char, buf); 3404 return JNI_OK; 3405 } 3406 3407 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3408 3409 FREE_C_HEAP_ARRAY(char, buf); 3410 return retcode; 3411 } 3412 3413 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3414 // Construct option array 3415 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3416 3417 // some pointers to help with parsing 3418 char *buffer_end = buffer + buf_len; 3419 char *opt_hd = buffer; 3420 char *wrt = buffer; 3421 char *rd = buffer; 3422 3423 // parse all options 3424 while (rd < buffer_end) { 3425 // skip leading white space from the input string 3426 while (rd < buffer_end && isspace(*rd)) { 3427 rd++; 3428 } 3429 3430 if (rd >= buffer_end) { 3431 break; 3432 } 3433 3434 // Remember this is where we found the head of the token. 3435 opt_hd = wrt; 3436 3437 // Tokens are strings of non white space characters separated 3438 // by one or more white spaces. 3439 while (rd < buffer_end && !isspace(*rd)) { 3440 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3441 int quote = *rd; // matching quote to look for 3442 rd++; // don't copy open quote 3443 while (rd < buffer_end && *rd != quote) { 3444 // include everything (even spaces) 3445 // up until the close quote 3446 *wrt++ = *rd++; // copy to option string 3447 } 3448 3449 if (rd < buffer_end) { 3450 rd++; // don't copy close quote 3451 } else { 3452 // did not see closing quote 3453 jio_fprintf(defaultStream::error_stream(), 3454 "Unmatched quote in %s\n", name); 3455 return JNI_ERR; 3456 } 3457 } else { 3458 *wrt++ = *rd++; // copy to option string 3459 } 3460 } 3461 3462 // steal a white space character and set it to NULL 3463 *wrt++ = '\0'; 3464 // We now have a complete token 3465 3466 JavaVMOption option; 3467 option.optionString = opt_hd; 3468 option.extraInfo = NULL; 3469 3470 options.append(option); // Fill in option 3471 3472 rd++; // Advance to next character 3473 } 3474 3475 // Fill out JavaVMInitArgs structure. 3476 return vm_args->set_args(&options); 3477 } 3478 3479 void Arguments::set_shared_spaces_flags_and_archive_paths() { 3480 if (DumpSharedSpaces) { 3481 if (RequireSharedSpaces) { 3482 warning("Cannot dump shared archive while using shared archive"); 3483 } 3484 UseSharedSpaces = false; 3485 } 3486 #if INCLUDE_CDS 3487 // Initialize shared archive paths which could include both base and dynamic archive paths 3488 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly. 3489 // 3490 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid. 3491 if (DumpSharedSpaces || UseSharedSpaces) { 3492 init_shared_archive_paths(); 3493 } 3494 #endif // INCLUDE_CDS 3495 } 3496 3497 #if INCLUDE_CDS 3498 // Sharing support 3499 // Construct the path to the archive 3500 char* Arguments::get_default_shared_archive_path() { 3501 char *default_archive_path; 3502 char jvm_path[JVM_MAXPATHLEN]; 3503 os::jvm_path(jvm_path, sizeof(jvm_path)); 3504 char *end = strrchr(jvm_path, *os::file_separator()); 3505 if (end != NULL) *end = '\0'; 3506 size_t jvm_path_len = strlen(jvm_path); 3507 size_t file_sep_len = strlen(os::file_separator()); 3508 const size_t len = jvm_path_len + file_sep_len + 20; 3509 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3510 jio_snprintf(default_archive_path, len, 3511 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa", 3512 jvm_path, os::file_separator()); 3513 return default_archive_path; 3514 } 3515 3516 int Arguments::num_archives(const char* archive_path) { 3517 if (archive_path == NULL) { 3518 return 0; 3519 } 3520 int npaths = 1; 3521 char* p = (char*)archive_path; 3522 while (*p != '\0') { 3523 if (*p == os::path_separator()[0]) { 3524 npaths++; 3525 } 3526 p++; 3527 } 3528 return npaths; 3529 } 3530 3531 void Arguments::extract_shared_archive_paths(const char* archive_path, 3532 char** base_archive_path, 3533 char** top_archive_path) { 3534 char* begin_ptr = (char*)archive_path; 3535 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3536 if (end_ptr == NULL || end_ptr == begin_ptr) { 3537 vm_exit_during_initialization("Base archive was not specified", archive_path); 3538 } 3539 size_t len = end_ptr - begin_ptr; 3540 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3541 strncpy(cur_path, begin_ptr, len); 3542 cur_path[len] = '\0'; 3543 *base_archive_path = cur_path; 3544 3545 begin_ptr = ++end_ptr; 3546 if (*begin_ptr == '\0') { 3547 vm_exit_during_initialization("Top archive was not specified", archive_path); 3548 } 3549 end_ptr = strchr(begin_ptr, '\0'); 3550 assert(end_ptr != NULL, "sanity"); 3551 len = end_ptr - begin_ptr; 3552 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3553 strncpy(cur_path, begin_ptr, len + 1); 3554 *top_archive_path = cur_path; 3555 } 3556 3557 void Arguments::init_shared_archive_paths() { 3558 if (ArchiveClassesAtExit != nullptr) { 3559 assert(!RecordDynamicDumpInfo, "already checked"); 3560 if (DumpSharedSpaces) { 3561 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3562 } 3563 check_unsupported_dumping_properties(); 3564 3565 if (os::same_files((const char*)get_default_shared_archive_path(), ArchiveClassesAtExit)) { 3566 vm_exit_during_initialization( 3567 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path()); 3568 } 3569 } 3570 3571 if (SharedArchiveFile == nullptr) { 3572 SharedArchivePath = get_default_shared_archive_path(); 3573 } else { 3574 int archives = num_archives(SharedArchiveFile); 3575 assert(archives > 0, "must be"); 3576 3577 if (is_dumping_archive() && archives > 1) { 3578 vm_exit_during_initialization( 3579 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3580 } 3581 3582 if (DumpSharedSpaces) { 3583 assert(archives == 1, "must be"); 3584 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file 3585 // will be overwritten no matter regardless of its contents 3586 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3587 } else { 3588 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa 3589 // is read from top.jsa 3590 // (a) 1 file: -XX:SharedArchiveFile=base.jsa 3591 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa 3592 // (c) 2 files: -XX:SharedArchiveFile=top.jsa 3593 // 3594 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not 3595 // allow cases (b) and (c). Case (b) is already checked above. 3596 3597 if (archives > 2) { 3598 vm_exit_during_initialization( 3599 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3600 } 3601 if (archives == 1) { 3602 char* base_archive_path = NULL; 3603 bool success = 3604 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path); 3605 if (!success) { 3606 // If +AutoCreateSharedArchive and the specified shared archive does not exist, 3607 // regenerate the dynamic archive base on default archive. 3608 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) { 3609 DynamicDumpSharedSpaces = true; 3610 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile); 3611 SharedArchivePath = get_default_shared_archive_path(); 3612 SharedArchiveFile = nullptr; 3613 } else { 3614 if (AutoCreateSharedArchive) { 3615 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info."); 3616 AutoCreateSharedArchive = false; 3617 } 3618 no_shared_spaces("invalid archive"); 3619 } 3620 } else if (base_archive_path == NULL) { 3621 // User has specified a single archive, which is a static archive. 3622 SharedArchivePath = const_cast<char *>(SharedArchiveFile); 3623 } else { 3624 // User has specified a single archive, which is a dynamic archive. 3625 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile); 3626 SharedArchivePath = base_archive_path; // has been c-heap allocated. 3627 } 3628 } else { 3629 extract_shared_archive_paths((const char*)SharedArchiveFile, 3630 &SharedArchivePath, &SharedDynamicArchivePath); 3631 if (SharedArchivePath == NULL) { 3632 assert(SharedDynamicArchivePath == NULL, "must be"); 3633 no_shared_spaces("invalid archive"); 3634 } 3635 } 3636 3637 if (SharedDynamicArchivePath != nullptr) { 3638 // Check for case (c) 3639 if (RecordDynamicDumpInfo) { 3640 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3641 SharedArchiveFile); 3642 } 3643 if (ArchiveClassesAtExit != nullptr) { 3644 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3645 SharedArchiveFile); 3646 } 3647 } 3648 3649 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3650 vm_exit_during_initialization( 3651 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3652 SharedArchiveFile); 3653 } 3654 } 3655 } 3656 } 3657 #endif // INCLUDE_CDS 3658 3659 #ifndef PRODUCT 3660 // Determine whether LogVMOutput should be implicitly turned on. 3661 static bool use_vm_log() { 3662 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3663 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3664 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3665 PrintAssembly || TraceDeoptimization || TraceDependencies || 3666 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3667 return true; 3668 } 3669 3670 #ifdef COMPILER1 3671 if (PrintC1Statistics) { 3672 return true; 3673 } 3674 #endif // COMPILER1 3675 3676 #ifdef COMPILER2 3677 if (PrintOptoAssembly || PrintOptoStatistics) { 3678 return true; 3679 } 3680 #endif // COMPILER2 3681 3682 return false; 3683 } 3684 3685 #endif // PRODUCT 3686 3687 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3688 for (int index = 0; index < args->nOptions; index++) { 3689 const JavaVMOption* option = args->options + index; 3690 const char* tail; 3691 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3692 return true; 3693 } 3694 } 3695 return false; 3696 } 3697 3698 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3699 const char* vm_options_file, 3700 const int vm_options_file_pos, 3701 ScopedVMInitArgs* vm_options_file_args, 3702 ScopedVMInitArgs* args_out) { 3703 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3704 if (code != JNI_OK) { 3705 return code; 3706 } 3707 3708 if (vm_options_file_args->get()->nOptions < 1) { 3709 return JNI_OK; 3710 } 3711 3712 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3713 jio_fprintf(defaultStream::error_stream(), 3714 "A VM options file may not refer to a VM options file. " 3715 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3716 "options file '%s' in options container '%s' is an error.\n", 3717 vm_options_file_args->vm_options_file_arg(), 3718 vm_options_file_args->container_name()); 3719 return JNI_EINVAL; 3720 } 3721 3722 return args_out->insert(args, vm_options_file_args->get(), 3723 vm_options_file_pos); 3724 } 3725 3726 // Expand -XX:VMOptionsFile found in args_in as needed. 3727 // mod_args and args_out parameters may return values as needed. 3728 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3729 ScopedVMInitArgs* mod_args, 3730 JavaVMInitArgs** args_out) { 3731 jint code = match_special_option_and_act(args_in, mod_args); 3732 if (code != JNI_OK) { 3733 return code; 3734 } 3735 3736 if (mod_args->is_set()) { 3737 // args_in contains -XX:VMOptionsFile and mod_args contains the 3738 // original options from args_in along with the options expanded 3739 // from the VMOptionsFile. Return a short-hand to the caller. 3740 *args_out = mod_args->get(); 3741 } else { 3742 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3743 } 3744 return JNI_OK; 3745 } 3746 3747 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3748 ScopedVMInitArgs* args_out) { 3749 // Remaining part of option string 3750 const char* tail; 3751 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3752 3753 for (int index = 0; index < args->nOptions; index++) { 3754 const JavaVMOption* option = args->options + index; 3755 if (match_option(option, "-XX:Flags=", &tail)) { 3756 Arguments::set_jvm_flags_file(tail); 3757 continue; 3758 } 3759 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3760 if (vm_options_file_args.found_vm_options_file_arg()) { 3761 jio_fprintf(defaultStream::error_stream(), 3762 "The option '%s' is already specified in the options " 3763 "container '%s' so the specification of '%s' in the " 3764 "same options container is an error.\n", 3765 vm_options_file_args.vm_options_file_arg(), 3766 vm_options_file_args.container_name(), 3767 option->optionString); 3768 return JNI_EINVAL; 3769 } 3770 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3771 // If there's a VMOptionsFile, parse that 3772 jint code = insert_vm_options_file(args, tail, index, 3773 &vm_options_file_args, args_out); 3774 if (code != JNI_OK) { 3775 return code; 3776 } 3777 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3778 if (args_out->is_set()) { 3779 // The VMOptions file inserted some options so switch 'args' 3780 // to the new set of options, and continue processing which 3781 // preserves "last option wins" semantics. 3782 args = args_out->get(); 3783 // The first option from the VMOptionsFile replaces the 3784 // current option. So we back track to process the 3785 // replacement option. 3786 index--; 3787 } 3788 continue; 3789 } 3790 if (match_option(option, "-XX:+PrintVMOptions")) { 3791 PrintVMOptions = true; 3792 continue; 3793 } 3794 if (match_option(option, "-XX:-PrintVMOptions")) { 3795 PrintVMOptions = false; 3796 continue; 3797 } 3798 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3799 IgnoreUnrecognizedVMOptions = true; 3800 continue; 3801 } 3802 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3803 IgnoreUnrecognizedVMOptions = false; 3804 continue; 3805 } 3806 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3807 JVMFlag::printFlags(tty, false); 3808 vm_exit(0); 3809 } 3810 3811 #ifndef PRODUCT 3812 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3813 JVMFlag::printFlags(tty, true); 3814 vm_exit(0); 3815 } 3816 #endif 3817 } 3818 return JNI_OK; 3819 } 3820 3821 static void print_options(const JavaVMInitArgs *args) { 3822 const char* tail; 3823 for (int index = 0; index < args->nOptions; index++) { 3824 const JavaVMOption *option = args->options + index; 3825 if (match_option(option, "-XX:", &tail)) { 3826 logOption(tail); 3827 } 3828 } 3829 } 3830 3831 bool Arguments::handle_deprecated_print_gc_flags() { 3832 if (PrintGC) { 3833 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3834 } 3835 if (PrintGCDetails) { 3836 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3837 } 3838 3839 if (_legacyGCLogging.lastFlag == 2) { 3840 // -Xloggc was used to specify a filename 3841 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3842 3843 LogTarget(Error, logging) target; 3844 LogStream errstream(target); 3845 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, NULL, &errstream); 3846 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3847 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3848 } 3849 return true; 3850 } 3851 3852 static void apply_debugger_ergo() { 3853 #ifndef PRODUCT 3854 // UseDebuggerErgo is notproduct 3855 if (ReplayCompiles) { 3856 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3857 } 3858 #endif 3859 3860 #ifndef PRODUCT 3861 if (UseDebuggerErgo) { 3862 // Turn on sub-flags 3863 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3864 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3865 } 3866 #endif 3867 3868 if (UseDebuggerErgo2) { 3869 // Debugging with limited number of CPUs 3870 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3871 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3872 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3873 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3874 } 3875 } 3876 3877 // Parse entry point called from JNI_CreateJavaVM 3878 3879 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3880 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3881 JVMFlag::check_all_flag_declarations(); 3882 3883 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3884 const char* hotspotrc = ".hotspotrc"; 3885 bool settings_file_specified = false; 3886 bool needs_hotspotrc_warning = false; 3887 ScopedVMInitArgs initial_vm_options_args(""); 3888 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3889 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3890 3891 // Pointers to current working set of containers 3892 JavaVMInitArgs* cur_cmd_args; 3893 JavaVMInitArgs* cur_vm_options_args; 3894 JavaVMInitArgs* cur_java_options_args; 3895 JavaVMInitArgs* cur_java_tool_options_args; 3896 3897 // Containers for modified/expanded options 3898 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3899 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3900 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3901 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3902 3903 3904 jint code = 3905 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3906 if (code != JNI_OK) { 3907 return code; 3908 } 3909 3910 code = parse_java_options_environment_variable(&initial_java_options_args); 3911 if (code != JNI_OK) { 3912 return code; 3913 } 3914 3915 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3916 char *vmoptions = ClassLoader::lookup_vm_options(); 3917 if (vmoptions != NULL) { 3918 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3919 FREE_C_HEAP_ARRAY(char, vmoptions); 3920 if (code != JNI_OK) { 3921 return code; 3922 } 3923 } 3924 3925 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3926 &mod_java_tool_options_args, 3927 &cur_java_tool_options_args); 3928 if (code != JNI_OK) { 3929 return code; 3930 } 3931 3932 code = expand_vm_options_as_needed(initial_cmd_args, 3933 &mod_cmd_args, 3934 &cur_cmd_args); 3935 if (code != JNI_OK) { 3936 return code; 3937 } 3938 3939 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3940 &mod_java_options_args, 3941 &cur_java_options_args); 3942 if (code != JNI_OK) { 3943 return code; 3944 } 3945 3946 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3947 &mod_vm_options_args, 3948 &cur_vm_options_args); 3949 if (code != JNI_OK) { 3950 return code; 3951 } 3952 3953 const char* flags_file = Arguments::get_jvm_flags_file(); 3954 settings_file_specified = (flags_file != NULL); 3955 3956 if (IgnoreUnrecognizedVMOptions) { 3957 cur_cmd_args->ignoreUnrecognized = true; 3958 cur_java_tool_options_args->ignoreUnrecognized = true; 3959 cur_java_options_args->ignoreUnrecognized = true; 3960 } 3961 3962 // Parse specified settings file 3963 if (settings_file_specified) { 3964 if (!process_settings_file(flags_file, true, 3965 cur_cmd_args->ignoreUnrecognized)) { 3966 return JNI_EINVAL; 3967 } 3968 } else { 3969 #ifdef ASSERT 3970 // Parse default .hotspotrc settings file 3971 if (!process_settings_file(".hotspotrc", false, 3972 cur_cmd_args->ignoreUnrecognized)) { 3973 return JNI_EINVAL; 3974 } 3975 #else 3976 struct stat buf; 3977 if (os::stat(hotspotrc, &buf) == 0) { 3978 needs_hotspotrc_warning = true; 3979 } 3980 #endif 3981 } 3982 3983 if (PrintVMOptions) { 3984 print_options(cur_java_tool_options_args); 3985 print_options(cur_cmd_args); 3986 print_options(cur_java_options_args); 3987 } 3988 3989 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3990 jint result = parse_vm_init_args(cur_vm_options_args, 3991 cur_java_tool_options_args, 3992 cur_java_options_args, 3993 cur_cmd_args); 3994 3995 if (result != JNI_OK) { 3996 return result; 3997 } 3998 3999 // Delay warning until here so that we've had a chance to process 4000 // the -XX:-PrintWarnings flag 4001 if (needs_hotspotrc_warning) { 4002 warning("%s file is present but has been ignored. " 4003 "Run with -XX:Flags=%s to load the file.", 4004 hotspotrc, hotspotrc); 4005 } 4006 4007 if (needs_module_property_warning) { 4008 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4009 " names that are reserved for internal use."); 4010 } 4011 4012 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4013 UNSUPPORTED_OPTION(UseLargePages); 4014 #endif 4015 4016 #if defined(AIX) 4017 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 4018 #endif 4019 4020 #ifndef PRODUCT 4021 if (TraceBytecodesAt != 0) { 4022 TraceBytecodes = true; 4023 } 4024 if (CountCompiledCalls) { 4025 if (UseCounterDecay) { 4026 warning("UseCounterDecay disabled because CountCalls is set"); 4027 UseCounterDecay = false; 4028 } 4029 } 4030 #endif // PRODUCT 4031 4032 if (ScavengeRootsInCode == 0) { 4033 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4034 warning("Forcing ScavengeRootsInCode non-zero"); 4035 } 4036 ScavengeRootsInCode = 1; 4037 } 4038 4039 if (!handle_deprecated_print_gc_flags()) { 4040 return JNI_EINVAL; 4041 } 4042 4043 // Set object alignment values. 4044 set_object_alignment(); 4045 4046 #if !INCLUDE_CDS 4047 if (DumpSharedSpaces || RequireSharedSpaces) { 4048 jio_fprintf(defaultStream::error_stream(), 4049 "Shared spaces are not supported in this VM\n"); 4050 return JNI_ERR; 4051 } 4052 if (DumpLoadedClassList != NULL) { 4053 jio_fprintf(defaultStream::error_stream(), 4054 "DumpLoadedClassList is not supported in this VM\n"); 4055 return JNI_ERR; 4056 } 4057 if ((UseSharedSpaces && xshare_auto_cmd_line) || 4058 log_is_enabled(Info, cds)) { 4059 warning("Shared spaces are not supported in this VM"); 4060 UseSharedSpaces = false; 4061 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4062 } 4063 no_shared_spaces("CDS Disabled"); 4064 #endif // INCLUDE_CDS 4065 4066 // Verify NMT arguments 4067 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 4068 if (lvl == NMT_unknown) { 4069 jio_fprintf(defaultStream::error_stream(), 4070 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4071 return JNI_ERR; 4072 } 4073 if (PrintNMTStatistics && lvl == NMT_off) { 4074 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 4075 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 4076 } 4077 4078 if (TraceDependencies && VerifyDependencies) { 4079 if (!FLAG_IS_DEFAULT(TraceDependencies)) { 4080 warning("TraceDependencies results may be inflated by VerifyDependencies"); 4081 } 4082 } 4083 4084 apply_debugger_ergo(); 4085 4086 if (log_is_enabled(Info, arguments)) { 4087 LogStream st(Log(arguments)::info()); 4088 Arguments::print_on(&st); 4089 } 4090 4091 return JNI_OK; 4092 } 4093 4094 jint Arguments::apply_ergo() { 4095 // Set flags based on ergonomics. 4096 jint result = set_ergonomics_flags(); 4097 if (result != JNI_OK) return result; 4098 4099 // Set heap size based on available physical memory 4100 set_heap_size(); 4101 4102 GCConfig::arguments()->initialize(); 4103 4104 set_shared_spaces_flags_and_archive_paths(); 4105 4106 // Initialize Metaspace flags and alignments 4107 Metaspace::ergo_initialize(); 4108 4109 if (!StringDedup::ergo_initialize()) { 4110 return JNI_EINVAL; 4111 } 4112 4113 // Set compiler flags after GC is selected and GC specific 4114 // flags (LoopStripMiningIter) are set. 4115 CompilerConfig::ergo_initialize(); 4116 4117 // Set bytecode rewriting flags 4118 set_bytecode_flags(); 4119 4120 // Set flags if aggressive optimization flags are enabled 4121 jint code = set_aggressive_opts_flags(); 4122 if (code != JNI_OK) { 4123 return code; 4124 } 4125 4126 #ifdef ZERO 4127 // Clear flags not supported on zero. 4128 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4129 #endif // ZERO 4130 4131 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4132 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4133 DebugNonSafepoints = true; 4134 } 4135 4136 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4137 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4138 } 4139 4140 // Treat the odd case where local verification is enabled but remote 4141 // verification is not as if both were enabled. 4142 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4143 log_info(verification)("Turning on remote verification because local verification is on"); 4144 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4145 } 4146 if (!EnableValhalla || (is_interpreter_only() && !is_dumping_archive() && !UseSharedSpaces)) { 4147 // Disable calling convention optimizations if inline types are not supported. 4148 // Also these aren't useful in -Xint. However, don't disable them when dumping or using 4149 // the CDS archive, as the values must match between dumptime and runtime. 4150 InlineTypePassFieldsAsArgs = false; 4151 InlineTypeReturnedAsFields = false; 4152 } 4153 4154 #ifndef PRODUCT 4155 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4156 if (use_vm_log()) { 4157 LogVMOutput = true; 4158 } 4159 } 4160 #endif // PRODUCT 4161 4162 if (PrintCommandLineFlags) { 4163 JVMFlag::printSetFlags(tty); 4164 } 4165 4166 #ifdef COMPILER2 4167 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 4168 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 4169 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 4170 } 4171 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 4172 4173 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 4174 if (!EnableVectorReboxing) { 4175 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 4176 } else { 4177 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 4178 } 4179 } 4180 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 4181 4182 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 4183 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 4184 } 4185 FLAG_SET_DEFAULT(UseVectorStubs, false); 4186 } 4187 #endif // COMPILER2 4188 4189 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 4190 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 4191 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 4192 } 4193 } 4194 return JNI_OK; 4195 } 4196 4197 jint Arguments::adjust_after_os() { 4198 if (UseNUMA) { 4199 if (UseParallelGC) { 4200 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4201 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4202 } 4203 } 4204 } 4205 return JNI_OK; 4206 } 4207 4208 int Arguments::PropertyList_count(SystemProperty* pl) { 4209 int count = 0; 4210 while(pl != NULL) { 4211 count++; 4212 pl = pl->next(); 4213 } 4214 return count; 4215 } 4216 4217 // Return the number of readable properties. 4218 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4219 int count = 0; 4220 while(pl != NULL) { 4221 if (pl->readable()) { 4222 count++; 4223 } 4224 pl = pl->next(); 4225 } 4226 return count; 4227 } 4228 4229 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4230 assert(key != NULL, "just checking"); 4231 SystemProperty* prop; 4232 for (prop = pl; prop != NULL; prop = prop->next()) { 4233 if (strcmp(key, prop->key()) == 0) return prop->value(); 4234 } 4235 return NULL; 4236 } 4237 4238 // Return the value of the requested property provided that it is a readable property. 4239 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4240 assert(key != NULL, "just checking"); 4241 SystemProperty* prop; 4242 // Return the property value if the keys match and the property is not internal or 4243 // it's the special internal property "jdk.boot.class.path.append". 4244 for (prop = pl; prop != NULL; prop = prop->next()) { 4245 if (strcmp(key, prop->key()) == 0) { 4246 if (!prop->internal()) { 4247 return prop->value(); 4248 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4249 return prop->value(); 4250 } else { 4251 // Property is internal and not jdk.boot.class.path.append so return NULL. 4252 return NULL; 4253 } 4254 } 4255 } 4256 return NULL; 4257 } 4258 4259 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4260 SystemProperty* p = *plist; 4261 if (p == NULL) { 4262 *plist = new_p; 4263 } else { 4264 while (p->next() != NULL) { 4265 p = p->next(); 4266 } 4267 p->set_next(new_p); 4268 } 4269 } 4270 4271 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4272 bool writeable, bool internal) { 4273 if (plist == NULL) 4274 return; 4275 4276 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4277 PropertyList_add(plist, new_p); 4278 } 4279 4280 void Arguments::PropertyList_add(SystemProperty *element) { 4281 PropertyList_add(&_system_properties, element); 4282 } 4283 4284 // This add maintains unique property key in the list. 4285 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4286 PropertyAppendable append, PropertyWriteable writeable, 4287 PropertyInternal internal) { 4288 if (plist == NULL) 4289 return; 4290 4291 // If property key exists and is writeable, then update with new value. 4292 // Trying to update a non-writeable property is silently ignored. 4293 SystemProperty* prop; 4294 for (prop = *plist; prop != NULL; prop = prop->next()) { 4295 if (strcmp(k, prop->key()) == 0) { 4296 if (append == AppendProperty) { 4297 prop->append_writeable_value(v); 4298 } else { 4299 prop->set_writeable_value(v); 4300 } 4301 return; 4302 } 4303 } 4304 4305 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4306 } 4307 4308 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4309 // Returns true if all of the source pointed by src has been copied over to 4310 // the destination buffer pointed by buf. Otherwise, returns false. 4311 // Notes: 4312 // 1. If the length (buflen) of the destination buffer excluding the 4313 // NULL terminator character is not long enough for holding the expanded 4314 // pid characters, it also returns false instead of returning the partially 4315 // expanded one. 4316 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4317 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4318 char* buf, size_t buflen) { 4319 const char* p = src; 4320 char* b = buf; 4321 const char* src_end = &src[srclen]; 4322 char* buf_end = &buf[buflen - 1]; 4323 4324 while (p < src_end && b < buf_end) { 4325 if (*p == '%') { 4326 switch (*(++p)) { 4327 case '%': // "%%" ==> "%" 4328 *b++ = *p++; 4329 break; 4330 case 'p': { // "%p" ==> current process id 4331 // buf_end points to the character before the last character so 4332 // that we could write '\0' to the end of the buffer. 4333 size_t buf_sz = buf_end - b + 1; 4334 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4335 4336 // if jio_snprintf fails or the buffer is not long enough to hold 4337 // the expanded pid, returns false. 4338 if (ret < 0 || ret >= (int)buf_sz) { 4339 return false; 4340 } else { 4341 b += ret; 4342 assert(*b == '\0', "fail in copy_expand_pid"); 4343 if (p == src_end && b == buf_end + 1) { 4344 // reach the end of the buffer. 4345 return true; 4346 } 4347 } 4348 p++; 4349 break; 4350 } 4351 default : 4352 *b++ = '%'; 4353 } 4354 } else { 4355 *b++ = *p++; 4356 } 4357 } 4358 *b = '\0'; 4359 return (p == src_end); // return false if not all of the source was copied 4360 } 4361 4362 bool Arguments::parse_malloc_limit_size(const char* s, size_t* out) { 4363 julong limit = 0; 4364 Arguments::ArgsRange range = parse_memory_size(s, &limit, 1, SIZE_MAX); 4365 switch (range) { 4366 case ArgsRange::arg_in_range: 4367 *out = (size_t)limit; 4368 return true; 4369 case ArgsRange::arg_too_big: // only possible on 32-bit 4370 vm_exit_during_initialization("MallocLimit: too large", s); 4371 break; 4372 case ArgsRange::arg_too_small: 4373 vm_exit_during_initialization("MallocLimit: limit must be > 0"); 4374 break; 4375 default: 4376 break; 4377 } 4378 return false; 4379 } 4380 4381 // Helper for parse_malloc_limits 4382 void Arguments::parse_single_category_limit(char* expression, size_t limits[mt_number_of_types]) { 4383 // <category>:<limit> 4384 char* colon = ::strchr(expression, ':'); 4385 if (colon == nullptr) { 4386 vm_exit_during_initialization("MallocLimit: colon missing", expression); 4387 } 4388 *colon = '\0'; 4389 MEMFLAGS f = NMTUtil::string_to_flag(expression); 4390 if (f == mtNone) { 4391 vm_exit_during_initialization("MallocLimit: invalid nmt category", expression); 4392 } 4393 if (parse_malloc_limit_size(colon + 1, limits + (int)f) == false) { 4394 vm_exit_during_initialization("Invalid MallocLimit size", colon + 1); 4395 } 4396 } 4397 4398 void Arguments::parse_malloc_limits(size_t* total_limit, size_t limits[mt_number_of_types]) { 4399 4400 // Reset output to 0 4401 *total_limit = 0; 4402 for (int i = 0; i < mt_number_of_types; i ++) { 4403 limits[i] = 0; 4404 } 4405 4406 // We are done if the option is not given. 4407 if (MallocLimit == nullptr) { 4408 return; 4409 } 4410 4411 // Global form? 4412 if (parse_malloc_limit_size(MallocLimit, total_limit)) { 4413 return; 4414 } 4415 4416 // No. So it must be in category-specific form: MallocLimit=<nmt category>:<size>[,<nmt category>:<size> ..] 4417 char* copy = os::strdup(MallocLimit); 4418 if (copy == nullptr) { 4419 vm_exit_out_of_memory(strlen(MallocLimit), OOM_MALLOC_ERROR, "MallocLimit"); 4420 } 4421 4422 char* p = copy, *q; 4423 do { 4424 q = p; 4425 p = ::strchr(q, ','); 4426 if (p != nullptr) { 4427 *p = '\0'; 4428 p ++; 4429 } 4430 parse_single_category_limit(q, limits); 4431 } while (p != nullptr); 4432 4433 os::free(copy); 4434 4435 }