1 /* 2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 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 "logging/log.hpp" 39 #include "logging/logConfiguration.hpp" 40 #include "logging/logStream.hpp" 41 #include "logging/logTag.hpp" 42 #include "memory/allocation.inline.hpp" 43 #include "metaprogramming/enableIf.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/vm_version.hpp" 57 #include "services/management.hpp" 58 #include "services/nmtCommon.hpp" 59 #include "utilities/align.hpp" 60 #include "utilities/debug.hpp" 61 #include "utilities/defaultStream.hpp" 62 #include "utilities/macros.hpp" 63 #include "utilities/powerOfTwo.hpp" 64 #include "utilities/stringUtils.hpp" 65 #if INCLUDE_JFR 66 #include "jfr/jfr.hpp" 67 #endif 68 #include <limits> 69 70 #define DEFAULT_JAVA_LAUNCHER "generic" 71 72 char* Arguments::_jvm_flags_file = NULL; 73 char** Arguments::_jvm_flags_array = NULL; 74 int Arguments::_num_jvm_flags = 0; 75 char** Arguments::_jvm_args_array = NULL; 76 int Arguments::_num_jvm_args = 0; 77 char* Arguments::_java_command = NULL; 78 SystemProperty* Arguments::_system_properties = NULL; 79 size_t Arguments::_conservative_max_heap_alignment = 0; 80 Arguments::Mode Arguments::_mode = _mixed; 81 bool Arguments::_java_compiler = false; 82 bool Arguments::_xdebug_mode = false; 83 const char* Arguments::_java_vendor_url_bug = NULL; 84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 85 bool Arguments::_sun_java_launcher_is_altjvm = false; 86 87 // These parameters are reset in method parse_vm_init_args() 88 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 89 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 90 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 91 bool Arguments::_ClipInlining = ClipInlining; 92 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 93 94 bool Arguments::_enable_preview = false; 95 96 char* Arguments::SharedArchivePath = NULL; 97 char* Arguments::SharedDynamicArchivePath = NULL; 98 99 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 }; 100 101 AgentLibraryList Arguments::_libraryList; 102 AgentLibraryList Arguments::_agentList; 103 104 // These are not set by the JDK's built-in launchers, but they can be set by 105 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 106 // JavaVMOption in jni.h. 107 abort_hook_t Arguments::_abort_hook = NULL; 108 exit_hook_t Arguments::_exit_hook = NULL; 109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 110 111 112 SystemProperty *Arguments::_sun_boot_library_path = NULL; 113 SystemProperty *Arguments::_java_library_path = NULL; 114 SystemProperty *Arguments::_java_home = NULL; 115 SystemProperty *Arguments::_java_class_path = NULL; 116 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 117 SystemProperty *Arguments::_vm_info = NULL; 118 119 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 120 PathString *Arguments::_system_boot_class_path = NULL; 121 bool Arguments::_has_jimage = false; 122 123 char* Arguments::_ext_dirs = NULL; 124 125 // True if -Xshare:auto option was specified. 126 static bool xshare_auto_cmd_line = false; 127 128 bool PathString::set_value(const char *value) { 129 if (_value != NULL) { 130 FreeHeap(_value); 131 } 132 _value = AllocateHeap(strlen(value)+1, mtArguments); 133 assert(_value != NULL, "Unable to allocate space for new path value"); 134 if (_value != NULL) { 135 strcpy(_value, value); 136 } else { 137 // not able to allocate 138 return false; 139 } 140 return true; 141 } 142 143 void PathString::append_value(const char *value) { 144 char *sp; 145 size_t len = 0; 146 if (value != NULL) { 147 len = strlen(value); 148 if (_value != NULL) { 149 len += strlen(_value); 150 } 151 sp = AllocateHeap(len+2, mtArguments); 152 assert(sp != NULL, "Unable to allocate space for new append path value"); 153 if (sp != NULL) { 154 if (_value != NULL) { 155 strcpy(sp, _value); 156 strcat(sp, os::path_separator()); 157 strcat(sp, value); 158 FreeHeap(_value); 159 } else { 160 strcpy(sp, value); 161 } 162 _value = sp; 163 } 164 } 165 } 166 167 PathString::PathString(const char* value) { 168 if (value == NULL) { 169 _value = NULL; 170 } else { 171 _value = AllocateHeap(strlen(value)+1, mtArguments); 172 strcpy(_value, value); 173 } 174 } 175 176 PathString::~PathString() { 177 if (_value != NULL) { 178 FreeHeap(_value); 179 _value = NULL; 180 } 181 } 182 183 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 184 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 185 size_t len = strlen(module_name) + 1; 186 _module_name = AllocateHeap(len, mtInternal); 187 strncpy(_module_name, module_name, len); // copy the trailing null 188 _path = new PathString(path); 189 } 190 191 ModulePatchPath::~ModulePatchPath() { 192 if (_module_name != NULL) { 193 FreeHeap(_module_name); 194 _module_name = NULL; 195 } 196 if (_path != NULL) { 197 delete _path; 198 _path = NULL; 199 } 200 } 201 202 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 203 if (key == NULL) { 204 _key = NULL; 205 } else { 206 _key = AllocateHeap(strlen(key)+1, mtArguments); 207 strcpy(_key, key); 208 } 209 _next = NULL; 210 _internal = internal; 211 _writeable = writeable; 212 } 213 214 AgentLibrary::AgentLibrary(const char* name, const char* options, 215 bool is_absolute_path, void* os_lib, 216 bool instrument_lib) { 217 _name = AllocateHeap(strlen(name)+1, mtArguments); 218 strcpy(_name, name); 219 if (options == NULL) { 220 _options = NULL; 221 } else { 222 _options = AllocateHeap(strlen(options)+1, mtArguments); 223 strcpy(_options, options); 224 } 225 _is_absolute_path = is_absolute_path; 226 _os_lib = os_lib; 227 _next = NULL; 228 _state = agent_invalid; 229 _is_static_lib = false; 230 _is_instrument_lib = instrument_lib; 231 } 232 233 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 234 // part of the option string. 235 static bool match_option(const JavaVMOption *option, const char* name, 236 const char** tail) { 237 size_t len = strlen(name); 238 if (strncmp(option->optionString, name, len) == 0) { 239 *tail = option->optionString + len; 240 return true; 241 } else { 242 return false; 243 } 244 } 245 246 // Check if 'option' matches 'name'. No "tail" is allowed. 247 static bool match_option(const JavaVMOption *option, const char* name) { 248 const char* tail = NULL; 249 bool result = match_option(option, name, &tail); 250 if (tail != NULL && *tail == '\0') { 251 return result; 252 } else { 253 return false; 254 } 255 } 256 257 // Return true if any of the strings in null-terminated array 'names' matches. 258 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 259 // the option must match exactly. 260 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 261 bool tail_allowed) { 262 for (/* empty */; *names != NULL; ++names) { 263 if (match_option(option, *names, tail)) { 264 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 265 return true; 266 } 267 } 268 } 269 return false; 270 } 271 272 #if INCLUDE_JFR 273 static bool _has_jfr_option = false; // is using JFR 274 275 // return true on failure 276 static bool match_jfr_option(const JavaVMOption** option) { 277 assert((*option)->optionString != NULL, "invariant"); 278 char* tail = NULL; 279 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 280 _has_jfr_option = true; 281 return Jfr::on_start_flight_recording_option(option, tail); 282 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 283 _has_jfr_option = true; 284 return Jfr::on_flight_recorder_option(option, tail); 285 } 286 return false; 287 } 288 289 bool Arguments::has_jfr_option() { 290 return _has_jfr_option; 291 } 292 #endif 293 294 static void logOption(const char* opt) { 295 if (PrintVMOptions) { 296 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 297 } 298 } 299 300 bool needs_module_property_warning = false; 301 302 #define MODULE_PROPERTY_PREFIX "jdk.module." 303 #define MODULE_PROPERTY_PREFIX_LEN 11 304 #define ADDEXPORTS "addexports" 305 #define ADDEXPORTS_LEN 10 306 #define ADDREADS "addreads" 307 #define ADDREADS_LEN 8 308 #define ADDOPENS "addopens" 309 #define ADDOPENS_LEN 8 310 #define PATCH "patch" 311 #define PATCH_LEN 5 312 #define ADDMODS "addmods" 313 #define ADDMODS_LEN 7 314 #define LIMITMODS "limitmods" 315 #define LIMITMODS_LEN 9 316 #define PATH "path" 317 #define PATH_LEN 4 318 #define UPGRADE_PATH "upgrade.path" 319 #define UPGRADE_PATH_LEN 12 320 #define ENABLE_NATIVE_ACCESS "enable.native.access" 321 #define ENABLE_NATIVE_ACCESS_LEN 20 322 323 void Arguments::add_init_library(const char* name, char* options) { 324 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 325 } 326 327 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 328 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 329 } 330 331 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 332 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 333 } 334 335 // Late-binding agents not started via arguments 336 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 337 _agentList.add(agentLib); 338 } 339 340 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 341 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 342 return ((strncmp(option, property, len) == 0) && 343 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 344 } 345 346 // Return true if property starts with "jdk.module." and its ensuing chars match 347 // any of the reserved module properties. 348 // property should be passed without the leading "-D". 349 bool Arguments::is_internal_module_property(const char* property) { 350 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 351 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 352 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 353 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 354 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 355 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 356 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 357 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 358 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 359 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 360 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 361 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 362 return true; 363 } 364 } 365 return false; 366 } 367 368 // Process java launcher properties. 369 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 370 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 371 // Must do this before setting up other system properties, 372 // as some of them may depend on launcher type. 373 for (int index = 0; index < args->nOptions; index++) { 374 const JavaVMOption* option = args->options + index; 375 const char* tail; 376 377 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 378 process_java_launcher_argument(tail, option->extraInfo); 379 continue; 380 } 381 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 382 if (strcmp(tail, "true") == 0) { 383 _sun_java_launcher_is_altjvm = true; 384 } 385 continue; 386 } 387 } 388 } 389 390 // Initialize system properties key and value. 391 void Arguments::init_system_properties() { 392 393 // Set up _system_boot_class_path which is not a property but 394 // relies heavily on argument processing and the jdk.boot.class.path.append 395 // property. It is used to store the underlying system boot class path. 396 _system_boot_class_path = new PathString(NULL); 397 398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 399 "Java Virtual Machine Specification", false)); 400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 401 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 402 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 403 404 // Initialize the vm.info now, but it will need updating after argument parsing. 405 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 406 407 // Following are JVMTI agent writable properties. 408 // Properties values are set to NULL and they are 409 // os specific they are initialized in os::init_system_properties_values(). 410 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 411 _java_library_path = new SystemProperty("java.library.path", NULL, true); 412 _java_home = new SystemProperty("java.home", NULL, true); 413 _java_class_path = new SystemProperty("java.class.path", "", true); 414 // jdk.boot.class.path.append is a non-writeable, internal property. 415 // It can only be set by either: 416 // - -Xbootclasspath/a: 417 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 418 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", NULL, false, true); 419 420 // Add to System Property list. 421 PropertyList_add(&_system_properties, _sun_boot_library_path); 422 PropertyList_add(&_system_properties, _java_library_path); 423 PropertyList_add(&_system_properties, _java_home); 424 PropertyList_add(&_system_properties, _java_class_path); 425 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 426 PropertyList_add(&_system_properties, _vm_info); 427 428 // Set OS specific system properties values 429 os::init_system_properties_values(); 430 } 431 432 // Update/Initialize System properties after JDK version number is known 433 void Arguments::init_version_specific_system_properties() { 434 enum { bufsz = 16 }; 435 char buffer[bufsz]; 436 const char* spec_vendor = "Oracle Corporation"; 437 uint32_t spec_version = JDK_Version::current().major_version(); 438 439 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 440 441 PropertyList_add(&_system_properties, 442 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 443 PropertyList_add(&_system_properties, 444 new SystemProperty("java.vm.specification.version", buffer, false)); 445 PropertyList_add(&_system_properties, 446 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 447 } 448 449 /* 450 * -XX argument processing: 451 * 452 * -XX arguments are defined in several places, such as: 453 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 454 * -XX arguments are parsed in parse_argument(). 455 * -XX argument bounds checking is done in check_vm_args_consistency(). 456 * 457 * Over time -XX arguments may change. There are mechanisms to handle common cases: 458 * 459 * ALIASED: An option that is simply another name for another option. This is often 460 * part of the process of deprecating a flag, but not all aliases need 461 * to be deprecated. 462 * 463 * Create an alias for an option by adding the old and new option names to the 464 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 465 * 466 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 467 * support may be removed in the future. Both regular and aliased options may be 468 * deprecated. 469 * 470 * Add a deprecation warning for an option (or alias) by adding an entry in the 471 * "special_jvm_flags" table and setting the "deprecated_in" field. 472 * Often an option "deprecated" in one major release will 473 * be made "obsolete" in the next. In this case the entry should also have its 474 * "obsolete_in" field set. 475 * 476 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 477 * on the command line. A warning is printed to let the user know that option might not 478 * be accepted in the future. 479 * 480 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 481 * table and setting the "obsolete_in" field. 482 * 483 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 484 * to the current JDK version. The system will flatly refuse to admit the existence of 485 * the flag. This allows a flag to die automatically over JDK releases. 486 * 487 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 488 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 489 * - Newly obsolete or expired deprecated options should have their global variable 490 * definitions removed (from globals.hpp, etc) and related implementations removed. 491 * 492 * Recommended approach for removing options: 493 * 494 * To remove options commonly used by customers (e.g. product -XX options), use 495 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 496 * 497 * To remove internal options (e.g. diagnostic, experimental, develop options), use 498 * a 2-step model adding major release numbers to the obsolete and expire columns. 499 * 500 * To change the name of an option, use the alias table as well as a 2-step 501 * model adding major release numbers to the deprecate and expire columns. 502 * Think twice about aliasing commonly used customer options. 503 * 504 * There are times when it is appropriate to leave a future release number as undefined. 505 * 506 * Tests: Aliases should be tested in VMAliasOptions.java. 507 * Deprecated options should be tested in VMDeprecatedOptions.java. 508 */ 509 510 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 511 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 512 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 513 // the command-line as usual, but will issue a warning. 514 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 515 // the command-line, while issuing a warning and ignoring the flag value. 516 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 517 // existence of the flag. 518 // 519 // MANUAL CLEANUP ON JDK VERSION UPDATES: 520 // This table ensures that the handling of options will update automatically when the JDK 521 // version is incremented, but the source code needs to be cleanup up manually: 522 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 523 // variable should be removed, as well as users of the variable. 524 // - As "deprecated" options age into "obsolete" options, move the entry into the 525 // "Obsolete Flags" section of the table. 526 // - All expired options should be removed from the table. 527 static SpecialFlag const special_jvm_flags[] = { 528 // -------------- Deprecated Flags -------------- 529 // --- Non-alias flags - sorted by obsolete_in then expired_in: 530 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 531 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 532 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 533 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 534 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 535 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 536 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 537 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 538 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 539 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 540 #ifdef PRODUCT 541 { "UseHeavyMonitors", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) }, 542 #endif 543 { "ExtendedDTraceProbes", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) }, 544 { "UseContainerCpuShares", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) }, 545 { "PreferContainerQuotaForCPUCount", JDK_Version::jdk(19), JDK_Version::jdk(20), JDK_Version::jdk(21) }, 546 547 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 548 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 549 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 550 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 551 552 // -------------- Obsolete Flags - sorted by expired_in -------------- 553 554 { "FilterSpuriousWakeups", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) }, 555 { "MinInliningThreshold", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::jdk(20) }, 556 { "PrefetchFieldsAhead", JDK_Version::undefined(), JDK_Version::jdk(19), JDK_Version::jdk(20) }, 557 #ifdef ASSERT 558 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 559 #endif 560 561 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 562 // These entries will generate build errors. Their purpose is to test the macros. 563 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 564 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 565 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 566 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 567 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 568 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 569 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 570 #endif 571 572 { NULL, JDK_Version(0), JDK_Version(0) } 573 }; 574 575 // Flags that are aliases for other flags. 576 typedef struct { 577 const char* alias_name; 578 const char* real_name; 579 } AliasedFlag; 580 581 static AliasedFlag const aliased_jvm_flags[] = { 582 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 583 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 584 { NULL, NULL} 585 }; 586 587 // Return true if "v" is less than "other", where "other" may be "undefined". 588 static bool version_less_than(JDK_Version v, JDK_Version other) { 589 assert(!v.is_undefined(), "must be defined"); 590 if (!other.is_undefined() && v.compare(other) >= 0) { 591 return false; 592 } else { 593 return true; 594 } 595 } 596 597 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 598 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 599 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 600 flag = special_jvm_flags[i]; 601 return true; 602 } 603 } 604 return false; 605 } 606 607 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 608 assert(version != NULL, "Must provide a version buffer"); 609 SpecialFlag flag; 610 if (lookup_special_flag(flag_name, flag)) { 611 if (!flag.obsolete_in.is_undefined()) { 612 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 613 *version = flag.obsolete_in; 614 // This flag may have been marked for obsoletion in this version, but we may not 615 // have actually removed it yet. Rather than ignoring it as soon as we reach 616 // this version we allow some time for the removal to happen. So if the flag 617 // still actually exists we process it as normal, but issue an adjusted warning. 618 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 619 if (real_flag != NULL) { 620 char version_str[256]; 621 version->to_string(version_str, sizeof(version_str)); 622 warning("Temporarily processing option %s; support is scheduled for removal in %s", 623 flag_name, version_str); 624 return false; 625 } 626 return true; 627 } 628 } 629 } 630 return false; 631 } 632 633 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 634 assert(version != NULL, "Must provide a version buffer"); 635 SpecialFlag flag; 636 if (lookup_special_flag(flag_name, flag)) { 637 if (!flag.deprecated_in.is_undefined()) { 638 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 639 version_less_than(JDK_Version::current(), flag.expired_in)) { 640 *version = flag.deprecated_in; 641 return 1; 642 } else { 643 return -1; 644 } 645 } 646 } 647 return 0; 648 } 649 650 const char* Arguments::real_flag_name(const char *flag_name) { 651 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 652 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 653 if (strcmp(flag_status.alias_name, flag_name) == 0) { 654 return flag_status.real_name; 655 } 656 } 657 return flag_name; 658 } 659 660 #ifdef ASSERT 661 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 662 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 663 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 664 return true; 665 } 666 } 667 return false; 668 } 669 670 // Verifies the correctness of the entries in the special_jvm_flags table. 671 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 672 // version being earlier than the deprecation version, then a warning is issued 673 // and verification fails - by returning false. If it is detected that the table 674 // is out of date, with respect to the current version, then ideally a warning is 675 // issued but verification does not fail. This allows the VM to operate when the 676 // version is first updated, without needing to update all the impacted flags at 677 // the same time. In practice we can't issue the warning immediately when the version 678 // is updated as it occurs for every test and some tests are not prepared to handle 679 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 680 // if the check_globals flag is true, and in addition allow a grace period and only 681 // check for stale flags when we hit build 25 (which is far enough into the 6 month 682 // release cycle that all flag updates should have been processed, whilst still 683 // leaving time to make the change before RDP2). 684 // We use a gtest to call this, passing true, so that we can detect stale flags before 685 // the end of the release cycle. 686 687 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 688 689 bool Arguments::verify_special_jvm_flags(bool check_globals) { 690 bool success = true; 691 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 692 const SpecialFlag& flag = special_jvm_flags[i]; 693 if (lookup_special_flag(flag.name, i)) { 694 warning("Duplicate special flag declaration \"%s\"", flag.name); 695 success = false; 696 } 697 if (flag.deprecated_in.is_undefined() && 698 flag.obsolete_in.is_undefined()) { 699 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 700 success = false; 701 } 702 703 if (!flag.deprecated_in.is_undefined()) { 704 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 705 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 706 success = false; 707 } 708 709 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 710 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 711 success = false; 712 } 713 } 714 715 if (!flag.obsolete_in.is_undefined()) { 716 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 717 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 718 success = false; 719 } 720 721 // if flag has become obsolete it should not have a "globals" flag defined anymore. 722 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 723 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 724 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 725 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 726 success = false; 727 } 728 } 729 730 } else if (!flag.expired_in.is_undefined()) { 731 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 732 success = false; 733 } 734 735 if (!flag.expired_in.is_undefined()) { 736 // if flag has become expired it should not have a "globals" flag defined anymore. 737 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 738 !version_less_than(JDK_Version::current(), flag.expired_in)) { 739 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 740 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 741 success = false; 742 } 743 } 744 } 745 } 746 return success; 747 } 748 #endif 749 750 template <typename T, ENABLE_IF(std::is_signed<T>::value), ENABLE_IF(sizeof(T) == 4)> // signed 32-bit 751 static bool parse_integer_impl(const char *s, char **endptr, int base, T* result) { 752 // Don't use strtol -- on 64-bit builds, "long" could be either 32- or 64-bits 753 // so the range tests could be tautological and might cause compiler warnings. 754 STATIC_ASSERT(sizeof(long long) >= 8); // C++ specification 755 errno = 0; // errno is thread safe 756 long long v = strtoll(s, endptr, base); 757 if (errno != 0 || v < min_jint || v > max_jint) { 758 return false; 759 } 760 *result = static_cast<T>(v); 761 return true; 762 } 763 764 template <typename T, ENABLE_IF(!std::is_signed<T>::value), ENABLE_IF(sizeof(T) == 4)> // unsigned 32-bit 765 static bool parse_integer_impl(const char *s, char **endptr, int base, T* result) { 766 if (s[0] == '-') { 767 return false; 768 } 769 // Don't use strtoul -- same reason as above. 770 STATIC_ASSERT(sizeof(unsigned long long) >= 8); // C++ specification 771 errno = 0; // errno is thread safe 772 unsigned long long v = strtoull(s, endptr, base); 773 if (errno != 0 || v > max_juint) { 774 return false; 775 } 776 *result = static_cast<T>(v); 777 return true; 778 } 779 780 template <typename T, ENABLE_IF(std::is_signed<T>::value), ENABLE_IF(sizeof(T) == 8)> // signed 64-bit 781 static bool parse_integer_impl(const char *s, char **endptr, int base, T* result) { 782 errno = 0; // errno is thread safe 783 *result = strtoll(s, endptr, base); 784 return errno == 0; 785 } 786 787 template <typename T, ENABLE_IF(!std::is_signed<T>::value), ENABLE_IF(sizeof(T) == 8)> // unsigned 64-bit 788 static bool parse_integer_impl(const char *s, char **endptr, int base, T* result) { 789 if (s[0] == '-') { 790 return false; 791 } 792 errno = 0; // errno is thread safe 793 *result = strtoull(s, endptr, base); 794 return errno == 0; 795 } 796 797 template<typename T> 798 static bool multiply_by_1k(T& n) { 799 if (n >= std::numeric_limits<T>::min() / 1024 && 800 n <= std::numeric_limits<T>::max() / 1024) { 801 n *= 1024; 802 return true; 803 } else { 804 return false; 805 } 806 } 807 808 // All of the integral types that can be used for command line options: 809 // int, uint, intx, uintx, uint64_t, size_t 810 // 811 // In all supported platforms, these types can be mapped to only 4 native types: 812 // {signed, unsigned} x {32-bit, 64-bit} 813 // 814 // We use SFINAE to pick the correct parse_integer_impl() function 815 template<typename T> 816 static bool parse_integer(const char *s, T* result) { 817 if (!isdigit(s[0]) && s[0] != '-') { 818 // strtoll/strtoull may allow leading spaces. Forbid it. 819 return false; 820 } 821 822 T n = 0; 823 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) || 824 (s[0] == '-' && s[1] == '0' && (s[2] == 'x' || s[3] == 'X')); 825 char* remainder; 826 827 if (!parse_integer_impl(s, &remainder, (is_hex ? 16 : 10), &n)) { 828 return false; 829 } 830 831 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 832 if (remainder == s || strlen(remainder) > 1) { 833 return false; 834 } 835 836 switch (*remainder) { 837 case 'T': case 't': 838 if (!multiply_by_1k(n)) return false; 839 // fall-through 840 case 'G': case 'g': 841 if (!multiply_by_1k(n)) return false; 842 // fall-through 843 case 'M': case 'm': 844 if (!multiply_by_1k(n)) return false; 845 // fall-through 846 case 'K': case 'k': 847 if (!multiply_by_1k(n)) return false; 848 break; 849 case '\0': 850 break; 851 default: 852 return false; 853 } 854 855 *result = n; 856 return true; 857 } 858 859 bool Arguments::atojulong(const char *s, julong* result) { 860 return parse_integer(s, result); 861 } 862 863 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 864 if (size < min_size) return arg_too_small; 865 if (size > max_size) return arg_too_big; 866 return arg_in_range; 867 } 868 869 // Describe an argument out of range error 870 void Arguments::describe_range_error(ArgsRange errcode) { 871 switch(errcode) { 872 case arg_too_big: 873 jio_fprintf(defaultStream::error_stream(), 874 "The specified size exceeds the maximum " 875 "representable size.\n"); 876 break; 877 case arg_too_small: 878 case arg_unreadable: 879 case arg_in_range: 880 // do nothing for now 881 break; 882 default: 883 ShouldNotReachHere(); 884 } 885 } 886 887 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 888 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 889 return true; 890 } else { 891 return false; 892 } 893 } 894 895 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlagOrigin origin) { 896 char* end; 897 errno = 0; 898 double v = strtod(value, &end); 899 if ((errno != 0) || (*end != 0)) { 900 return false; 901 } 902 903 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 904 return true; 905 } 906 return false; 907 } 908 909 static JVMFlag::Error set_numeric_flag(JVMFlag* flag, char* value, JVMFlagOrigin origin) { 910 if (flag == NULL) { 911 return JVMFlag::INVALID_FLAG; 912 } 913 914 if (flag->is_int()) { 915 int v; 916 if (parse_integer(value, &v)) { 917 return JVMFlagAccess::set_int(flag, &v, origin); 918 } 919 } else if (flag->is_uint()) { 920 uint v; 921 if (parse_integer(value, &v)) { 922 return JVMFlagAccess::set_uint(flag, &v, origin); 923 } 924 } else if (flag->is_intx()) { 925 intx v; 926 if (parse_integer(value, &v)) { 927 return JVMFlagAccess::set_intx(flag, &v, origin); 928 } 929 } else if (flag->is_uintx()) { 930 uintx v; 931 if (parse_integer(value, &v)) { 932 return JVMFlagAccess::set_uintx(flag, &v, origin); 933 } 934 } else if (flag->is_uint64_t()) { 935 uint64_t v; 936 if (parse_integer(value, &v)) { 937 return JVMFlagAccess::set_uint64_t(flag, &v, origin); 938 } 939 } else if (flag->is_size_t()) { 940 size_t v; 941 if (parse_integer(value, &v)) { 942 return JVMFlagAccess::set_size_t(flag, &v, origin); 943 } 944 } else if (flag->is_double()) { 945 // This function parses only input strings without a decimal 946 // point character (.) 947 // If a string looks like a FP number, it would be parsed by 948 // set_fp_numeric_flag(). See Arguments::parse_argument(). 949 jlong v; 950 if (parse_integer(value, &v)) { 951 double double_v = (double) v; 952 if (value[0] == '-' && v == 0) { // special case: 0.0 is different than -0.0. 953 double_v = -0.0; 954 } 955 return JVMFlagAccess::set_double(flag, &double_v, origin); 956 } 957 } 958 959 return JVMFlag::WRONG_FORMAT; 960 } 961 962 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 963 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 964 // Contract: JVMFlag always returns a pointer that needs freeing. 965 FREE_C_HEAP_ARRAY(char, value); 966 return true; 967 } 968 969 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 970 const char* old_value = ""; 971 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 972 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 973 size_t new_len = strlen(new_value); 974 const char* value; 975 char* free_this_too = NULL; 976 if (old_len == 0) { 977 value = new_value; 978 } else if (new_len == 0) { 979 value = old_value; 980 } else { 981 size_t length = old_len + 1 + new_len + 1; 982 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 983 // each new setting adds another LINE to the switch: 984 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 985 value = buf; 986 free_this_too = buf; 987 } 988 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 989 // JVMFlag always returns a pointer that needs freeing. 990 FREE_C_HEAP_ARRAY(char, value); 991 // JVMFlag made its own copy, so I must delete my own temp. buffer. 992 FREE_C_HEAP_ARRAY(char, free_this_too); 993 return true; 994 } 995 996 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 997 const char* real_name = real_flag_name(arg); 998 JDK_Version since = JDK_Version(); 999 switch (is_deprecated_flag(arg, &since)) { 1000 case -1: { 1001 // Obsolete or expired, so don't process normally, 1002 // but allow for an obsolete flag we're still 1003 // temporarily allowing. 1004 if (!is_obsolete_flag(arg, &since)) { 1005 return real_name; 1006 } 1007 // Note if we're not considered obsolete then we can't be expired either 1008 // as obsoletion must come first. 1009 return NULL; 1010 } 1011 case 0: 1012 return real_name; 1013 case 1: { 1014 if (warn) { 1015 char version[256]; 1016 since.to_string(version, sizeof(version)); 1017 if (real_name != arg) { 1018 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 1019 arg, version, real_name); 1020 } else { 1021 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 1022 arg, version); 1023 } 1024 } 1025 return real_name; 1026 } 1027 } 1028 ShouldNotReachHere(); 1029 return NULL; 1030 } 1031 1032 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 1033 1034 // range of acceptable characters spelled out for portability reasons 1035 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1036 #define BUFLEN 255 1037 char name[BUFLEN+1]; 1038 char dummy; 1039 const char* real_name; 1040 bool warn_if_deprecated = true; 1041 1042 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1043 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1044 if (real_name == NULL) { 1045 return false; 1046 } 1047 JVMFlag* flag = JVMFlag::find_flag(real_name); 1048 return set_bool_flag(flag, false, origin); 1049 } 1050 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1051 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1052 if (real_name == NULL) { 1053 return false; 1054 } 1055 JVMFlag* flag = JVMFlag::find_flag(real_name); 1056 return set_bool_flag(flag, true, origin); 1057 } 1058 1059 char punct; 1060 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1061 const char* value = strchr(arg, '=') + 1; 1062 1063 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1064 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1065 if (real_name == NULL) { 1066 return false; 1067 } 1068 JVMFlag* flag = JVMFlag::find_flag(real_name); 1069 if (flag != NULL && flag->is_ccstr()) { 1070 if (flag->ccstr_accumulates()) { 1071 return append_to_string_flag(flag, value, origin); 1072 } else { 1073 if (value[0] == '\0') { 1074 value = NULL; 1075 } 1076 return set_string_flag(flag, value, origin); 1077 } 1078 } else { 1079 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1080 } 1081 } 1082 1083 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1084 const char* value = strchr(arg, '=') + 1; 1085 // -XX:Foo:=xxx will reset the string flag to the given value. 1086 if (value[0] == '\0') { 1087 value = NULL; 1088 } 1089 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1090 if (real_name == NULL) { 1091 return false; 1092 } 1093 JVMFlag* flag = JVMFlag::find_flag(real_name); 1094 return set_string_flag(flag, value, origin); 1095 } 1096 1097 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1098 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1099 #define NUMBER_RANGE "[0123456789eE+-]" 1100 char value[BUFLEN + 1]; 1101 char value2[BUFLEN + 1]; 1102 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1103 // Looks like a floating-point number -- try again with more lenient format string 1104 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1105 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1106 if (real_name == NULL) { 1107 return false; 1108 } 1109 JVMFlag* flag = JVMFlag::find_flag(real_name); 1110 return set_fp_numeric_flag(flag, value, origin); 1111 } 1112 } 1113 1114 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1115 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1116 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1117 if (real_name == NULL) { 1118 return false; 1119 } 1120 JVMFlag* flag = JVMFlag::find_flag(real_name); 1121 return set_numeric_flag(flag, value, origin) == JVMFlag::SUCCESS; 1122 } 1123 1124 return false; 1125 } 1126 1127 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1128 assert(bldarray != NULL, "illegal argument"); 1129 1130 if (arg == NULL) { 1131 return; 1132 } 1133 1134 int new_count = *count + 1; 1135 1136 // expand the array and add arg to the last element 1137 if (*bldarray == NULL) { 1138 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1139 } else { 1140 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1141 } 1142 (*bldarray)[*count] = os::strdup_check_oom(arg); 1143 *count = new_count; 1144 } 1145 1146 void Arguments::build_jvm_args(const char* arg) { 1147 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1148 } 1149 1150 void Arguments::build_jvm_flags(const char* arg) { 1151 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1152 } 1153 1154 // utility function to return a string that concatenates all 1155 // strings in a given char** array 1156 const char* Arguments::build_resource_string(char** args, int count) { 1157 if (args == NULL || count == 0) { 1158 return NULL; 1159 } 1160 size_t length = 0; 1161 for (int i = 0; i < count; i++) { 1162 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1163 } 1164 char* s = NEW_RESOURCE_ARRAY(char, length); 1165 char* dst = s; 1166 for (int j = 0; j < count; j++) { 1167 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1168 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1169 dst += offset; 1170 length -= offset; 1171 } 1172 return (const char*) s; 1173 } 1174 1175 void Arguments::print_on(outputStream* st) { 1176 st->print_cr("VM Arguments:"); 1177 if (num_jvm_flags() > 0) { 1178 st->print("jvm_flags: "); print_jvm_flags_on(st); 1179 st->cr(); 1180 } 1181 if (num_jvm_args() > 0) { 1182 st->print("jvm_args: "); print_jvm_args_on(st); 1183 st->cr(); 1184 } 1185 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1186 if (_java_class_path != NULL) { 1187 char* path = _java_class_path->value(); 1188 size_t len = strlen(path); 1189 st->print("java_class_path (initial): "); 1190 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1191 if (len == 0) { 1192 st->print_raw_cr("<not set>"); 1193 } else { 1194 st->print_raw_cr(path, len); 1195 } 1196 } 1197 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1198 } 1199 1200 void Arguments::print_summary_on(outputStream* st) { 1201 // Print the command line. Environment variables that are helpful for 1202 // reproducing the problem are written later in the hs_err file. 1203 // flags are from setting file 1204 if (num_jvm_flags() > 0) { 1205 st->print_raw("Settings File: "); 1206 print_jvm_flags_on(st); 1207 st->cr(); 1208 } 1209 // args are the command line and environment variable arguments. 1210 st->print_raw("Command Line: "); 1211 if (num_jvm_args() > 0) { 1212 print_jvm_args_on(st); 1213 } 1214 // this is the classfile and any arguments to the java program 1215 if (java_command() != NULL) { 1216 st->print("%s", java_command()); 1217 } 1218 st->cr(); 1219 } 1220 1221 void Arguments::print_jvm_flags_on(outputStream* st) { 1222 if (_num_jvm_flags > 0) { 1223 for (int i=0; i < _num_jvm_flags; i++) { 1224 st->print("%s ", _jvm_flags_array[i]); 1225 } 1226 } 1227 } 1228 1229 void Arguments::print_jvm_args_on(outputStream* st) { 1230 if (_num_jvm_args > 0) { 1231 for (int i=0; i < _num_jvm_args; i++) { 1232 st->print("%s ", _jvm_args_array[i]); 1233 } 1234 } 1235 } 1236 1237 bool Arguments::process_argument(const char* arg, 1238 jboolean ignore_unrecognized, 1239 JVMFlagOrigin origin) { 1240 JDK_Version since = JDK_Version(); 1241 1242 if (parse_argument(arg, origin)) { 1243 return true; 1244 } 1245 1246 // Determine if the flag has '+', '-', or '=' characters. 1247 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1248 const char* const argname = has_plus_minus ? arg + 1 : arg; 1249 1250 size_t arg_len; 1251 const char* equal_sign = strchr(argname, '='); 1252 if (equal_sign == NULL) { 1253 arg_len = strlen(argname); 1254 } else { 1255 arg_len = equal_sign - argname; 1256 } 1257 1258 // Only make the obsolete check for valid arguments. 1259 if (arg_len <= BUFLEN) { 1260 // Construct a string which consists only of the argument name without '+', '-', or '='. 1261 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1262 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1263 if (is_obsolete_flag(stripped_argname, &since)) { 1264 char version[256]; 1265 since.to_string(version, sizeof(version)); 1266 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1267 return true; 1268 } 1269 } 1270 1271 // For locked flags, report a custom error message if available. 1272 // Otherwise, report the standard unrecognized VM option. 1273 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1274 if (found_flag != NULL) { 1275 char locked_message_buf[BUFLEN]; 1276 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1277 if (strlen(locked_message_buf) == 0) { 1278 if (found_flag->is_bool() && !has_plus_minus) { 1279 jio_fprintf(defaultStream::error_stream(), 1280 "Missing +/- setting for VM option '%s'\n", argname); 1281 } else if (!found_flag->is_bool() && has_plus_minus) { 1282 jio_fprintf(defaultStream::error_stream(), 1283 "Unexpected +/- setting in VM option '%s'\n", argname); 1284 } else { 1285 jio_fprintf(defaultStream::error_stream(), 1286 "Improperly specified VM option '%s'\n", argname); 1287 } 1288 } else { 1289 #ifdef PRODUCT 1290 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1291 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1292 if (ignore_unrecognized && mismatched) { 1293 return true; 1294 } 1295 #endif 1296 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1297 } 1298 } else { 1299 if (ignore_unrecognized) { 1300 return true; 1301 } 1302 jio_fprintf(defaultStream::error_stream(), 1303 "Unrecognized VM option '%s'\n", argname); 1304 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1305 if (fuzzy_matched != NULL) { 1306 jio_fprintf(defaultStream::error_stream(), 1307 "Did you mean '%s%s%s'? ", 1308 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1309 fuzzy_matched->name(), 1310 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1311 } 1312 } 1313 1314 // allow for commandline "commenting out" options like -XX:#+Verbose 1315 return arg[0] == '#'; 1316 } 1317 1318 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1319 FILE* stream = os::fopen(file_name, "rb"); 1320 if (stream == NULL) { 1321 if (should_exist) { 1322 jio_fprintf(defaultStream::error_stream(), 1323 "Could not open settings file %s\n", file_name); 1324 return false; 1325 } else { 1326 return true; 1327 } 1328 } 1329 1330 char token[1024]; 1331 int pos = 0; 1332 1333 bool in_white_space = true; 1334 bool in_comment = false; 1335 bool in_quote = false; 1336 char quote_c = 0; 1337 bool result = true; 1338 1339 int c = getc(stream); 1340 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1341 if (in_white_space) { 1342 if (in_comment) { 1343 if (c == '\n') in_comment = false; 1344 } else { 1345 if (c == '#') in_comment = true; 1346 else if (!isspace(c)) { 1347 in_white_space = false; 1348 token[pos++] = c; 1349 } 1350 } 1351 } else { 1352 if (c == '\n' || (!in_quote && isspace(c))) { 1353 // token ends at newline, or at unquoted whitespace 1354 // this allows a way to include spaces in string-valued options 1355 token[pos] = '\0'; 1356 logOption(token); 1357 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1358 build_jvm_flags(token); 1359 pos = 0; 1360 in_white_space = true; 1361 in_quote = false; 1362 } else if (!in_quote && (c == '\'' || c == '"')) { 1363 in_quote = true; 1364 quote_c = c; 1365 } else if (in_quote && (c == quote_c)) { 1366 in_quote = false; 1367 } else { 1368 token[pos++] = c; 1369 } 1370 } 1371 c = getc(stream); 1372 } 1373 if (pos > 0) { 1374 token[pos] = '\0'; 1375 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1376 build_jvm_flags(token); 1377 } 1378 fclose(stream); 1379 return result; 1380 } 1381 1382 //============================================================================================================= 1383 // Parsing of properties (-D) 1384 1385 const char* Arguments::get_property(const char* key) { 1386 return PropertyList_get_value(system_properties(), key); 1387 } 1388 1389 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1390 const char* eq = strchr(prop, '='); 1391 const char* key; 1392 const char* value = ""; 1393 1394 if (eq == NULL) { 1395 // property doesn't have a value, thus use passed string 1396 key = prop; 1397 } else { 1398 // property have a value, thus extract it and save to the 1399 // allocated string 1400 size_t key_len = eq - prop; 1401 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1402 1403 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1404 key = tmp_key; 1405 1406 value = &prop[key_len + 1]; 1407 } 1408 1409 #if INCLUDE_CDS 1410 if (is_internal_module_property(key) || 1411 strcmp(key, "jdk.module.main") == 0) { 1412 MetaspaceShared::disable_optimized_module_handling(); 1413 log_info(cds)("optimized module handling: disabled due to incompatible property: %s=%s", key, value); 1414 } 1415 if (strcmp(key, "jdk.module.showModuleResolution") == 0 || 1416 strcmp(key, "jdk.module.validation") == 0 || 1417 strcmp(key, "java.system.class.loader") == 0) { 1418 MetaspaceShared::disable_full_module_graph(); 1419 log_info(cds)("full module graph: disabled due to incompatible property: %s=%s", key, value); 1420 } 1421 #endif 1422 1423 if (strcmp(key, "java.compiler") == 0) { 1424 process_java_compiler_argument(value); 1425 // Record value in Arguments, but let it get passed to Java. 1426 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1427 // sun.java.launcher.is_altjvm property is 1428 // private and is processed in process_sun_java_launcher_properties(); 1429 // the sun.java.launcher property is passed on to the java application 1430 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1431 // append is true, writable is true, internal is false 1432 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1433 WriteableProperty, ExternalProperty); 1434 } else { 1435 if (strcmp(key, "sun.java.command") == 0) { 1436 char *old_java_command = _java_command; 1437 _java_command = os::strdup_check_oom(value, mtArguments); 1438 if (old_java_command != NULL) { 1439 os::free(old_java_command); 1440 } 1441 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1442 // If this property is set on the command line then its value will be 1443 // displayed in VM error logs as the URL at which to submit such logs. 1444 // Normally the URL displayed in error logs is different from the value 1445 // of this system property, so a different property should have been 1446 // used here, but we leave this as-is in case someone depends upon it. 1447 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1448 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1449 // its value without going through the property list or making a Java call. 1450 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1451 if (old_java_vendor_url_bug != NULL) { 1452 os::free((void *)old_java_vendor_url_bug); 1453 } 1454 } 1455 1456 // Create new property and add at the end of the list 1457 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1458 } 1459 1460 if (key != prop) { 1461 // SystemProperty copy passed value, thus free previously allocated 1462 // memory 1463 FreeHeap((void *)key); 1464 } 1465 1466 return true; 1467 } 1468 1469 #if INCLUDE_CDS 1470 const char* unsupported_properties[] = { "jdk.module.limitmods", 1471 "jdk.module.upgrade.path", 1472 "jdk.module.patch.0" }; 1473 const char* unsupported_options[] = { "--limit-modules", 1474 "--upgrade-module-path", 1475 "--patch-module" 1476 }; 1477 void Arguments::check_unsupported_dumping_properties() { 1478 assert(is_dumping_archive(), 1479 "this function is only used with CDS dump time"); 1480 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1481 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1482 SystemProperty* sp = system_properties(); 1483 while (sp != NULL) { 1484 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1485 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1486 vm_exit_during_initialization( 1487 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1488 } 1489 } 1490 sp = sp->next(); 1491 } 1492 1493 // Check for an exploded module build in use with -Xshare:dump. 1494 if (!has_jimage()) { 1495 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1496 } 1497 } 1498 1499 bool Arguments::check_unsupported_cds_runtime_properties() { 1500 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1501 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1502 if (ArchiveClassesAtExit != NULL) { 1503 // dynamic dumping, just return false for now. 1504 // check_unsupported_dumping_properties() will be called later to check the same set of 1505 // properties, and will exit the VM with the correct error message if the unsupported properties 1506 // are used. 1507 return false; 1508 } 1509 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1510 if (get_property(unsupported_properties[i]) != NULL) { 1511 if (RequireSharedSpaces) { 1512 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1513 } else { 1514 log_info(cds)("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1515 } 1516 return true; 1517 } 1518 } 1519 return false; 1520 } 1521 #endif 1522 1523 //=========================================================================================================== 1524 // Setting int/mixed/comp mode flags 1525 1526 void Arguments::set_mode_flags(Mode mode) { 1527 // Set up default values for all flags. 1528 // If you add a flag to any of the branches below, 1529 // add a default value for it here. 1530 set_java_compiler(false); 1531 _mode = mode; 1532 1533 // Ensure Agent_OnLoad has the correct initial values. 1534 // This may not be the final mode; mode may change later in onload phase. 1535 PropertyList_unique_add(&_system_properties, "java.vm.info", 1536 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1537 1538 UseInterpreter = true; 1539 UseCompiler = true; 1540 UseLoopCounter = true; 1541 1542 // Default values may be platform/compiler dependent - 1543 // use the saved values 1544 ClipInlining = Arguments::_ClipInlining; 1545 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1546 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1547 BackgroundCompilation = Arguments::_BackgroundCompilation; 1548 1549 // Change from defaults based on mode 1550 switch (mode) { 1551 default: 1552 ShouldNotReachHere(); 1553 break; 1554 case _int: 1555 UseCompiler = false; 1556 UseLoopCounter = false; 1557 AlwaysCompileLoopMethods = false; 1558 UseOnStackReplacement = false; 1559 break; 1560 case _mixed: 1561 // same as default 1562 break; 1563 case _comp: 1564 UseInterpreter = false; 1565 BackgroundCompilation = false; 1566 ClipInlining = false; 1567 break; 1568 } 1569 } 1570 1571 // Conflict: required to use shared spaces (-Xshare:on), but 1572 // incompatible command line options were chosen. 1573 static void no_shared_spaces(const char* message) { 1574 if (RequireSharedSpaces) { 1575 jio_fprintf(defaultStream::error_stream(), 1576 "Class data sharing is inconsistent with other specified options.\n"); 1577 vm_exit_during_initialization("Unable to use shared archive", message); 1578 } else { 1579 log_info(cds)("Unable to use shared archive: %s", message); 1580 UseSharedSpaces = false; 1581 } 1582 } 1583 1584 void set_object_alignment() { 1585 // Object alignment. 1586 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1587 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1588 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1589 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1590 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1591 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1592 1593 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1594 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1595 1596 // Oop encoding heap max 1597 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1598 } 1599 1600 size_t Arguments::max_heap_for_compressed_oops() { 1601 // Avoid sign flip. 1602 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1603 // We need to fit both the NULL page and the heap into the memory budget, while 1604 // keeping alignment constraints of the heap. To guarantee the latter, as the 1605 // NULL page is located before the heap, we pad the NULL page to the conservative 1606 // maximum alignment that the GC may ever impose upon the heap. 1607 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1608 _conservative_max_heap_alignment); 1609 1610 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1611 NOT_LP64(ShouldNotReachHere(); return 0); 1612 } 1613 1614 void Arguments::set_use_compressed_oops() { 1615 #ifdef _LP64 1616 // MaxHeapSize is not set up properly at this point, but 1617 // the only value that can override MaxHeapSize if we are 1618 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1619 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1620 1621 if (max_heap_size <= max_heap_for_compressed_oops()) { 1622 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1623 FLAG_SET_ERGO(UseCompressedOops, true); 1624 } 1625 } else { 1626 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1627 warning("Max heap size too large for Compressed Oops"); 1628 FLAG_SET_DEFAULT(UseCompressedOops, false); 1629 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) { 1630 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1631 } 1632 } 1633 } 1634 #endif // _LP64 1635 } 1636 1637 1638 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1639 // set_use_compressed_oops(). 1640 void Arguments::set_use_compressed_klass_ptrs() { 1641 #ifdef _LP64 1642 // On some architectures, the use of UseCompressedClassPointers implies the use of 1643 // UseCompressedOops. The reason is that the rheap_base register of said platforms 1644 // is reused to perform some optimized spilling, in order to use rheap_base as a 1645 // temp register. But by treating it as any other temp register, spilling can typically 1646 // be completely avoided instead. So it is better not to perform this trick. And by 1647 // not having that reliance, large heaps, or heaps not supporting compressed oops, 1648 // can still use compressed class pointers. 1649 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS && !UseCompressedOops) { 1650 if (UseCompressedClassPointers) { 1651 warning("UseCompressedClassPointers requires UseCompressedOops"); 1652 } 1653 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1654 } else { 1655 // Turn on UseCompressedClassPointers too 1656 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1657 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1658 } 1659 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1660 if (UseCompressedClassPointers) { 1661 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1662 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1663 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1664 } 1665 } 1666 } 1667 #endif // _LP64 1668 } 1669 1670 void Arguments::set_conservative_max_heap_alignment() { 1671 // The conservative maximum required alignment for the heap is the maximum of 1672 // the alignments imposed by several sources: any requirements from the heap 1673 // itself and the maximum page size we may run the VM with. 1674 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1675 _conservative_max_heap_alignment = MAX4(heap_alignment, 1676 (size_t)os::vm_allocation_granularity(), 1677 os::max_page_size(), 1678 GCArguments::compute_heap_alignment()); 1679 } 1680 1681 jint Arguments::set_ergonomics_flags() { 1682 GCConfig::initialize(); 1683 1684 set_conservative_max_heap_alignment(); 1685 1686 #ifdef _LP64 1687 set_use_compressed_oops(); 1688 1689 // set_use_compressed_klass_ptrs() must be called after calling 1690 // set_use_compressed_oops(). 1691 set_use_compressed_klass_ptrs(); 1692 1693 // Also checks that certain machines are slower with compressed oops 1694 // in vm_version initialization code. 1695 #endif // _LP64 1696 1697 return JNI_OK; 1698 } 1699 1700 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1701 size_t max_allocatable; 1702 size_t result = limit; 1703 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1704 // The AggressiveHeap check is a temporary workaround to avoid calling 1705 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1706 // selected. This works because AggressiveHeap implies UseParallelGC 1707 // where we know the ratio will be 1. Once the AggressiveHeap option is 1708 // removed, this can be cleaned up. 1709 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1710 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1711 result = MIN2(result, max_allocatable / fraction); 1712 } 1713 return result; 1714 } 1715 1716 // Use static initialization to get the default before parsing 1717 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1718 1719 void Arguments::set_heap_size() { 1720 julong phys_mem; 1721 1722 // If the user specified one of these options, they 1723 // want specific memory sizing so do not limit memory 1724 // based on compressed oops addressability. 1725 // Also, memory limits will be calculated based on 1726 // available os physical memory, not our MaxRAM limit, 1727 // unless MaxRAM is also specified. 1728 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1729 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1730 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1731 !FLAG_IS_DEFAULT(MinRAMFraction) || 1732 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1733 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1734 !FLAG_IS_DEFAULT(MaxRAM)); 1735 if (override_coop_limit) { 1736 if (FLAG_IS_DEFAULT(MaxRAM)) { 1737 phys_mem = os::physical_memory(); 1738 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1739 } else { 1740 phys_mem = (julong)MaxRAM; 1741 } 1742 } else { 1743 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1744 : (julong)MaxRAM; 1745 } 1746 1747 1748 // Convert deprecated flags 1749 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1750 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1751 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1752 1753 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1754 !FLAG_IS_DEFAULT(MinRAMFraction)) 1755 MinRAMPercentage = 100.0 / MinRAMFraction; 1756 1757 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1758 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1759 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1760 1761 // If the maximum heap size has not been set with -Xmx, 1762 // then set it as fraction of the size of physical memory, 1763 // respecting the maximum and minimum sizes of the heap. 1764 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1765 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1766 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1767 if (reasonable_min < MaxHeapSize) { 1768 // Small physical memory, so use a minimum fraction of it for the heap 1769 reasonable_max = reasonable_min; 1770 } else { 1771 // Not-small physical memory, so require a heap at least 1772 // as large as MaxHeapSize 1773 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1774 } 1775 1776 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1777 // Limit the heap size to ErgoHeapSizeLimit 1778 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1779 } 1780 1781 #ifdef _LP64 1782 if (UseCompressedOops || UseCompressedClassPointers) { 1783 // HeapBaseMinAddress can be greater than default but not less than. 1784 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1785 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1786 // matches compressed oops printing flags 1787 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1788 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1789 DefaultHeapBaseMinAddress, 1790 DefaultHeapBaseMinAddress/G, 1791 HeapBaseMinAddress); 1792 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1793 } 1794 } 1795 } 1796 if (UseCompressedOops) { 1797 // Limit the heap size to the maximum possible when using compressed oops 1798 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1799 1800 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1801 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1802 // but it should be not less than default MaxHeapSize. 1803 max_coop_heap -= HeapBaseMinAddress; 1804 } 1805 1806 // If user specified flags prioritizing os physical 1807 // memory limits, then disable compressed oops if 1808 // limits exceed max_coop_heap and UseCompressedOops 1809 // was not specified. 1810 if (reasonable_max > max_coop_heap) { 1811 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1812 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1813 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1814 "Please check the setting of MaxRAMPercentage %5.2f." 1815 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1816 FLAG_SET_ERGO(UseCompressedOops, false); 1817 if (COMPRESSED_CLASS_POINTERS_DEPENDS_ON_COMPRESSED_OOPS) { 1818 FLAG_SET_ERGO(UseCompressedClassPointers, false); 1819 } 1820 } else { 1821 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1822 } 1823 } 1824 } 1825 #endif // _LP64 1826 1827 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1828 1829 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1830 // An initial heap size was specified on the command line, 1831 // so be sure that the maximum size is consistent. Done 1832 // after call to limit_heap_by_allocatable_memory because that 1833 // method might reduce the allocation size. 1834 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1835 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1836 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1837 } 1838 1839 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1840 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1841 } 1842 1843 // If the minimum or initial heap_size have not been set or requested to be set 1844 // ergonomically, set them accordingly. 1845 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1846 julong reasonable_minimum = (julong)(OldSize + NewSize); 1847 1848 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1849 1850 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1851 1852 if (InitialHeapSize == 0) { 1853 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1854 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1855 1856 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1857 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1858 1859 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1860 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1861 } 1862 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1863 // synchronize with InitialHeapSize to avoid errors with the default value. 1864 if (MinHeapSize == 0) { 1865 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1866 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1867 } 1868 } 1869 } 1870 1871 // This option inspects the machine and attempts to set various 1872 // parameters to be optimal for long-running, memory allocation 1873 // intensive jobs. It is intended for machines with large 1874 // amounts of cpu and memory. 1875 jint Arguments::set_aggressive_heap_flags() { 1876 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1877 // VM, but we may not be able to represent the total physical memory 1878 // available (like having 8gb of memory on a box but using a 32bit VM). 1879 // Thus, we need to make sure we're using a julong for intermediate 1880 // calculations. 1881 julong initHeapSize; 1882 julong total_memory = os::physical_memory(); 1883 1884 if (total_memory < (julong) 256 * M) { 1885 jio_fprintf(defaultStream::error_stream(), 1886 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1887 vm_exit(1); 1888 } 1889 1890 // The heap size is half of available memory, or (at most) 1891 // all of possible memory less 160mb (leaving room for the OS 1892 // when using ISM). This is the maximum; because adaptive sizing 1893 // is turned on below, the actual space used may be smaller. 1894 1895 initHeapSize = MIN2(total_memory / (julong) 2, 1896 total_memory - (julong) 160 * M); 1897 1898 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1899 1900 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1901 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1902 return JNI_EINVAL; 1903 } 1904 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1905 return JNI_EINVAL; 1906 } 1907 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1908 return JNI_EINVAL; 1909 } 1910 } 1911 if (FLAG_IS_DEFAULT(NewSize)) { 1912 // Make the young generation 3/8ths of the total heap. 1913 if (FLAG_SET_CMDLINE(NewSize, 1914 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1915 return JNI_EINVAL; 1916 } 1917 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1918 return JNI_EINVAL; 1919 } 1920 } 1921 1922 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1923 FLAG_SET_DEFAULT(UseLargePages, true); 1924 #endif 1925 1926 // Increase some data structure sizes for efficiency 1927 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1928 return JNI_EINVAL; 1929 } 1930 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1931 return JNI_EINVAL; 1932 } 1933 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1934 return JNI_EINVAL; 1935 } 1936 1937 // See the OldPLABSize comment below, but replace 'after promotion' 1938 // with 'after copying'. YoungPLABSize is the size of the survivor 1939 // space per-gc-thread buffers. The default is 4kw. 1940 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1941 return JNI_EINVAL; 1942 } 1943 1944 // OldPLABSize is the size of the buffers in the old gen that 1945 // UseParallelGC uses to promote live data that doesn't fit in the 1946 // survivor spaces. At any given time, there's one for each gc thread. 1947 // The default size is 1kw. These buffers are rarely used, since the 1948 // survivor spaces are usually big enough. For specjbb, however, there 1949 // are occasions when there's lots of live data in the young gen 1950 // and we end up promoting some of it. We don't have a definite 1951 // explanation for why bumping OldPLABSize helps, but the theory 1952 // is that a bigger PLAB results in retaining something like the 1953 // original allocation order after promotion, which improves mutator 1954 // locality. A minor effect may be that larger PLABs reduce the 1955 // number of PLAB allocation events during gc. The value of 8kw 1956 // was arrived at by experimenting with specjbb. 1957 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1958 return JNI_EINVAL; 1959 } 1960 1961 // Enable parallel GC and adaptive generation sizing 1962 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1963 return JNI_EINVAL; 1964 } 1965 1966 // Encourage steady state memory management 1967 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1968 return JNI_EINVAL; 1969 } 1970 1971 // This appears to improve mutator locality 1972 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1973 return JNI_EINVAL; 1974 } 1975 1976 return JNI_OK; 1977 } 1978 1979 // This must be called after ergonomics. 1980 void Arguments::set_bytecode_flags() { 1981 if (!RewriteBytecodes) { 1982 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1983 } 1984 } 1985 1986 // Aggressive optimization flags 1987 jint Arguments::set_aggressive_opts_flags() { 1988 #ifdef COMPILER2 1989 if (AggressiveUnboxing) { 1990 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1991 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1992 } else if (!EliminateAutoBox) { 1993 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1994 AggressiveUnboxing = false; 1995 } 1996 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1997 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1998 } else if (!DoEscapeAnalysis) { 1999 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2000 AggressiveUnboxing = false; 2001 } 2002 } 2003 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2004 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2005 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2006 } 2007 // Feed the cache size setting into the JDK 2008 char buffer[1024]; 2009 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2010 if (!add_property(buffer)) { 2011 return JNI_ENOMEM; 2012 } 2013 } 2014 #endif 2015 2016 return JNI_OK; 2017 } 2018 2019 //=========================================================================================================== 2020 // Parsing of java.compiler property 2021 2022 void Arguments::process_java_compiler_argument(const char* arg) { 2023 // For backwards compatibility, Djava.compiler=NONE or "" 2024 // causes us to switch to -Xint mode UNLESS -Xdebug 2025 // is also specified. 2026 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2027 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2028 } 2029 } 2030 2031 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2032 _sun_java_launcher = os::strdup_check_oom(launcher); 2033 } 2034 2035 bool Arguments::created_by_java_launcher() { 2036 assert(_sun_java_launcher != NULL, "property must have value"); 2037 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2038 } 2039 2040 bool Arguments::sun_java_launcher_is_altjvm() { 2041 return _sun_java_launcher_is_altjvm; 2042 } 2043 2044 //=========================================================================================================== 2045 // Parsing of main arguments 2046 2047 unsigned int addreads_count = 0; 2048 unsigned int addexports_count = 0; 2049 unsigned int addopens_count = 0; 2050 unsigned int addmods_count = 0; 2051 unsigned int patch_mod_count = 0; 2052 unsigned int enable_native_access_count = 0; 2053 2054 // Check the consistency of vm_init_args 2055 bool Arguments::check_vm_args_consistency() { 2056 // Method for adding checks for flag consistency. 2057 // The intent is to warn the user of all possible conflicts, 2058 // before returning an error. 2059 // Note: Needs platform-dependent factoring. 2060 bool status = true; 2061 2062 if (TLABRefillWasteFraction == 0) { 2063 jio_fprintf(defaultStream::error_stream(), 2064 "TLABRefillWasteFraction should be a denominator, " 2065 "not " SIZE_FORMAT "\n", 2066 TLABRefillWasteFraction); 2067 status = false; 2068 } 2069 2070 status = CompilerConfig::check_args_consistency(status); 2071 #if INCLUDE_JVMCI 2072 if (status && EnableJVMCI) { 2073 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2074 AddProperty, UnwriteableProperty, InternalProperty); 2075 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2076 return false; 2077 } 2078 } 2079 #endif 2080 2081 #ifndef SUPPORT_RESERVED_STACK_AREA 2082 if (StackReservedPages != 0) { 2083 FLAG_SET_CMDLINE(StackReservedPages, 0); 2084 warning("Reserved Stack Area not supported on this platform"); 2085 } 2086 #endif 2087 2088 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) 2089 if (UseHeavyMonitors) { 2090 jio_fprintf(defaultStream::error_stream(), 2091 "UseHeavyMonitors is not fully implemented on this architecture"); 2092 return false; 2093 } 2094 #endif 2095 #if (defined(X86) || defined(PPC64)) && !defined(ZERO) 2096 if (UseHeavyMonitors && UseRTMForStackLocks) { 2097 jio_fprintf(defaultStream::error_stream(), 2098 "-XX:+UseHeavyMonitors and -XX:+UseRTMForStackLocks are mutually exclusive"); 2099 2100 return false; 2101 } 2102 #endif 2103 if (VerifyHeavyMonitors && !UseHeavyMonitors) { 2104 jio_fprintf(defaultStream::error_stream(), 2105 "-XX:+VerifyHeavyMonitors requires -XX:+UseHeavyMonitors"); 2106 return false; 2107 } 2108 2109 return status; 2110 } 2111 2112 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2113 const char* option_type) { 2114 if (ignore) return false; 2115 2116 const char* spacer = " "; 2117 if (option_type == NULL) { 2118 option_type = ++spacer; // Set both to the empty string. 2119 } 2120 2121 jio_fprintf(defaultStream::error_stream(), 2122 "Unrecognized %s%soption: %s\n", option_type, spacer, 2123 option->optionString); 2124 return true; 2125 } 2126 2127 static const char* user_assertion_options[] = { 2128 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2129 }; 2130 2131 static const char* system_assertion_options[] = { 2132 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2133 }; 2134 2135 bool Arguments::parse_uintx(const char* value, 2136 uintx* uintx_arg, 2137 uintx min_size) { 2138 uintx n; 2139 if (!parse_integer(value, &n)) { 2140 return false; 2141 } 2142 if (n >= min_size) { 2143 *uintx_arg = n; 2144 return true; 2145 } else { 2146 return false; 2147 } 2148 } 2149 2150 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2151 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 2152 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2153 char* property = AllocateHeap(prop_len, mtArguments); 2154 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2155 if (ret < 0 || ret >= (int)prop_len) { 2156 FreeHeap(property); 2157 return false; 2158 } 2159 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 2160 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 2161 // that multiple occurrences of the associated flag just causes the existing property value to be 2162 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 2163 // to a property after we have finished flag processing. 2164 bool added = add_property(property, WriteableProperty, internal); 2165 FreeHeap(property); 2166 return added; 2167 } 2168 2169 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2170 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 2171 const unsigned int props_count_limit = 1000; 2172 const int max_digits = 3; 2173 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2174 2175 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2176 if (count < props_count_limit) { 2177 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2178 char* property = AllocateHeap(prop_len, mtArguments); 2179 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2180 if (ret < 0 || ret >= (int)prop_len) { 2181 FreeHeap(property); 2182 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2183 return false; 2184 } 2185 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2186 FreeHeap(property); 2187 return added; 2188 } 2189 2190 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2191 return false; 2192 } 2193 2194 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2195 julong* long_arg, 2196 julong min_size, 2197 julong max_size) { 2198 if (!parse_integer(s, long_arg)) return arg_unreadable; 2199 return check_memory_size(*long_arg, min_size, max_size); 2200 } 2201 2202 // Parse JavaVMInitArgs structure 2203 2204 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 2205 const JavaVMInitArgs *java_tool_options_args, 2206 const JavaVMInitArgs *java_options_args, 2207 const JavaVMInitArgs *cmd_line_args) { 2208 bool patch_mod_javabase = false; 2209 2210 // Save default settings for some mode flags 2211 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2212 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2213 Arguments::_ClipInlining = ClipInlining; 2214 Arguments::_BackgroundCompilation = BackgroundCompilation; 2215 2216 // Remember the default value of SharedBaseAddress. 2217 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 2218 2219 // Setup flags for mixed which is the default 2220 set_mode_flags(_mixed); 2221 2222 // Parse args structure generated from java.base vm options resource 2223 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE); 2224 if (result != JNI_OK) { 2225 return result; 2226 } 2227 2228 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2229 // variable (if present). 2230 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 2231 if (result != JNI_OK) { 2232 return result; 2233 } 2234 2235 // Parse args structure generated from the command line flags. 2236 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE); 2237 if (result != JNI_OK) { 2238 return result; 2239 } 2240 2241 // Parse args structure generated from the _JAVA_OPTIONS environment 2242 // variable (if present) (mimics classic VM) 2243 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 2244 if (result != JNI_OK) { 2245 return result; 2246 } 2247 2248 // We need to ensure processor and memory resources have been properly 2249 // configured - which may rely on arguments we just processed - before 2250 // doing the final argument processing. Any argument processing that 2251 // needs to know about processor and memory resources must occur after 2252 // this point. 2253 2254 os::init_container_support(); 2255 2256 // Do final processing now that all arguments have been parsed 2257 result = finalize_vm_init_args(patch_mod_javabase); 2258 if (result != JNI_OK) { 2259 return result; 2260 } 2261 2262 return JNI_OK; 2263 } 2264 2265 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2266 // represents a valid JDWP agent. is_path==true denotes that we 2267 // are dealing with -agentpath (case where name is a path), otherwise with 2268 // -agentlib 2269 bool valid_jdwp_agent(char *name, bool is_path) { 2270 char *_name; 2271 const char *_jdwp = "jdwp"; 2272 size_t _len_jdwp, _len_prefix; 2273 2274 if (is_path) { 2275 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2276 return false; 2277 } 2278 2279 _name++; // skip past last path separator 2280 _len_prefix = strlen(JNI_LIB_PREFIX); 2281 2282 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2283 return false; 2284 } 2285 2286 _name += _len_prefix; 2287 _len_jdwp = strlen(_jdwp); 2288 2289 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2290 _name += _len_jdwp; 2291 } 2292 else { 2293 return false; 2294 } 2295 2296 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2297 return false; 2298 } 2299 2300 return true; 2301 } 2302 2303 if (strcmp(name, _jdwp) == 0) { 2304 return true; 2305 } 2306 2307 return false; 2308 } 2309 2310 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2311 // --patch-module=<module>=<file>(<pathsep><file>)* 2312 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2313 // Find the equal sign between the module name and the path specification 2314 const char* module_equal = strchr(patch_mod_tail, '='); 2315 if (module_equal == NULL) { 2316 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2317 return JNI_ERR; 2318 } else { 2319 // Pick out the module name 2320 size_t module_len = module_equal - patch_mod_tail; 2321 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2322 if (module_name != NULL) { 2323 memcpy(module_name, patch_mod_tail, module_len); 2324 *(module_name + module_len) = '\0'; 2325 // The path piece begins one past the module_equal sign 2326 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2327 FREE_C_HEAP_ARRAY(char, module_name); 2328 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2329 return JNI_ENOMEM; 2330 } 2331 } else { 2332 return JNI_ENOMEM; 2333 } 2334 } 2335 return JNI_OK; 2336 } 2337 2338 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2339 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2340 // The min and max sizes match the values in globals.hpp, but scaled 2341 // with K. The values have been chosen so that alignment with page 2342 // size doesn't change the max value, which makes the conversions 2343 // back and forth between Xss value and ThreadStackSize value easier. 2344 // The values have also been chosen to fit inside a 32-bit signed type. 2345 const julong min_ThreadStackSize = 0; 2346 const julong max_ThreadStackSize = 1 * M; 2347 2348 // Make sure the above values match the range set in globals.hpp 2349 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2350 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2351 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2352 2353 const julong min_size = min_ThreadStackSize * K; 2354 const julong max_size = max_ThreadStackSize * K; 2355 2356 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2357 2358 julong size = 0; 2359 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2360 if (errcode != arg_in_range) { 2361 bool silent = (option == NULL); // Allow testing to silence error messages 2362 if (!silent) { 2363 jio_fprintf(defaultStream::error_stream(), 2364 "Invalid thread stack size: %s\n", option->optionString); 2365 describe_range_error(errcode); 2366 } 2367 return JNI_EINVAL; 2368 } 2369 2370 // Internally track ThreadStackSize in units of 1024 bytes. 2371 const julong size_aligned = align_up(size, K); 2372 assert(size <= size_aligned, 2373 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2374 size, size_aligned); 2375 2376 const julong size_in_K = size_aligned / K; 2377 assert(size_in_K < (julong)max_intx, 2378 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2379 size_in_K); 2380 2381 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2382 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2383 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2384 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2385 max_expanded, size_in_K); 2386 2387 *out_ThreadStackSize = (intx)size_in_K; 2388 2389 return JNI_OK; 2390 } 2391 2392 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) { 2393 // For match_option to return remaining or value part of option string 2394 const char* tail; 2395 2396 // iterate over arguments 2397 for (int index = 0; index < args->nOptions; index++) { 2398 bool is_absolute_path = false; // for -agentpath vs -agentlib 2399 2400 const JavaVMOption* option = args->options + index; 2401 2402 if (!match_option(option, "-Djava.class.path", &tail) && 2403 !match_option(option, "-Dsun.java.command", &tail) && 2404 !match_option(option, "-Dsun.java.launcher", &tail)) { 2405 2406 // add all jvm options to the jvm_args string. This string 2407 // is used later to set the java.vm.args PerfData string constant. 2408 // the -Djava.class.path and the -Dsun.java.command options are 2409 // omitted from jvm_args string as each have their own PerfData 2410 // string constant object. 2411 build_jvm_args(option->optionString); 2412 } 2413 2414 // -verbose:[class/module/gc/jni] 2415 if (match_option(option, "-verbose", &tail)) { 2416 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2417 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2418 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2419 } else if (!strcmp(tail, ":module")) { 2420 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2421 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2422 } else if (!strcmp(tail, ":gc")) { 2423 if (_legacyGCLogging.lastFlag == 0) { 2424 _legacyGCLogging.lastFlag = 1; 2425 } 2426 } else if (!strcmp(tail, ":jni")) { 2427 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2428 } 2429 // -da / -ea / -disableassertions / -enableassertions 2430 // These accept an optional class/package name separated by a colon, e.g., 2431 // -da:java.lang.Thread. 2432 } else if (match_option(option, user_assertion_options, &tail, true)) { 2433 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2434 if (*tail == '\0') { 2435 JavaAssertions::setUserClassDefault(enable); 2436 } else { 2437 assert(*tail == ':', "bogus match by match_option()"); 2438 JavaAssertions::addOption(tail + 1, enable); 2439 } 2440 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2441 } else if (match_option(option, system_assertion_options, &tail, false)) { 2442 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2443 JavaAssertions::setSystemClassDefault(enable); 2444 // -bootclasspath: 2445 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2446 jio_fprintf(defaultStream::output_stream(), 2447 "-Xbootclasspath is no longer a supported option.\n"); 2448 return JNI_EINVAL; 2449 // -bootclasspath/a: 2450 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2451 Arguments::append_sysclasspath(tail); 2452 #if INCLUDE_CDS 2453 MetaspaceShared::disable_optimized_module_handling(); 2454 log_info(cds)("optimized module handling: disabled because bootclasspath was appended"); 2455 #endif 2456 // -bootclasspath/p: 2457 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2458 jio_fprintf(defaultStream::output_stream(), 2459 "-Xbootclasspath/p is no longer a supported option.\n"); 2460 return JNI_EINVAL; 2461 // -Xrun 2462 } else if (match_option(option, "-Xrun", &tail)) { 2463 if (tail != NULL) { 2464 const char* pos = strchr(tail, ':'); 2465 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2466 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2467 jio_snprintf(name, len + 1, "%s", tail); 2468 2469 char *options = NULL; 2470 if(pos != NULL) { 2471 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2472 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2473 } 2474 #if !INCLUDE_JVMTI 2475 if (strcmp(name, "jdwp") == 0) { 2476 jio_fprintf(defaultStream::error_stream(), 2477 "Debugging agents are not supported in this VM\n"); 2478 return JNI_ERR; 2479 } 2480 #endif // !INCLUDE_JVMTI 2481 add_init_library(name, options); 2482 } 2483 } else if (match_option(option, "--add-reads=", &tail)) { 2484 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2485 return JNI_ENOMEM; 2486 } 2487 } else if (match_option(option, "--add-exports=", &tail)) { 2488 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2489 return JNI_ENOMEM; 2490 } 2491 } else if (match_option(option, "--add-opens=", &tail)) { 2492 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2493 return JNI_ENOMEM; 2494 } 2495 } else if (match_option(option, "--add-modules=", &tail)) { 2496 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2497 return JNI_ENOMEM; 2498 } 2499 } else if (match_option(option, "--enable-native-access=", &tail)) { 2500 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2501 return JNI_ENOMEM; 2502 } 2503 } else if (match_option(option, "--limit-modules=", &tail)) { 2504 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2505 return JNI_ENOMEM; 2506 } 2507 } else if (match_option(option, "--module-path=", &tail)) { 2508 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2509 return JNI_ENOMEM; 2510 } 2511 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2512 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2513 return JNI_ENOMEM; 2514 } 2515 } else if (match_option(option, "--patch-module=", &tail)) { 2516 // --patch-module=<module>=<file>(<pathsep><file>)* 2517 int res = process_patch_mod_option(tail, patch_mod_javabase); 2518 if (res != JNI_OK) { 2519 return res; 2520 } 2521 } else if (match_option(option, "--illegal-access=", &tail)) { 2522 char version[256]; 2523 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2524 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2525 // -agentlib and -agentpath 2526 } else if (match_option(option, "-agentlib:", &tail) || 2527 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2528 if(tail != NULL) { 2529 const char* pos = strchr(tail, '='); 2530 char* name; 2531 if (pos == NULL) { 2532 name = os::strdup_check_oom(tail, mtArguments); 2533 } else { 2534 size_t len = pos - tail; 2535 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2536 memcpy(name, tail, len); 2537 name[len] = '\0'; 2538 } 2539 2540 char *options = NULL; 2541 if(pos != NULL) { 2542 options = os::strdup_check_oom(pos + 1, mtArguments); 2543 } 2544 #if !INCLUDE_JVMTI 2545 if (valid_jdwp_agent(name, is_absolute_path)) { 2546 jio_fprintf(defaultStream::error_stream(), 2547 "Debugging agents are not supported in this VM\n"); 2548 return JNI_ERR; 2549 } 2550 #endif // !INCLUDE_JVMTI 2551 add_init_agent(name, options, is_absolute_path); 2552 } 2553 // -javaagent 2554 } else if (match_option(option, "-javaagent:", &tail)) { 2555 #if !INCLUDE_JVMTI 2556 jio_fprintf(defaultStream::error_stream(), 2557 "Instrumentation agents are not supported in this VM\n"); 2558 return JNI_ERR; 2559 #else 2560 if (tail != NULL) { 2561 size_t length = strlen(tail) + 1; 2562 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2563 jio_snprintf(options, length, "%s", tail); 2564 add_instrument_agent("instrument", options, false); 2565 // java agents need module java.instrument 2566 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2567 return JNI_ENOMEM; 2568 } 2569 } 2570 #endif // !INCLUDE_JVMTI 2571 // --enable_preview 2572 } else if (match_option(option, "--enable-preview")) { 2573 set_enable_preview(); 2574 // -Xnoclassgc 2575 } else if (match_option(option, "-Xnoclassgc")) { 2576 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2577 return JNI_EINVAL; 2578 } 2579 // -Xbatch 2580 } else if (match_option(option, "-Xbatch")) { 2581 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2582 return JNI_EINVAL; 2583 } 2584 // -Xmn for compatibility with other JVM vendors 2585 } else if (match_option(option, "-Xmn", &tail)) { 2586 julong long_initial_young_size = 0; 2587 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2588 if (errcode != arg_in_range) { 2589 jio_fprintf(defaultStream::error_stream(), 2590 "Invalid initial young generation size: %s\n", option->optionString); 2591 describe_range_error(errcode); 2592 return JNI_EINVAL; 2593 } 2594 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2595 return JNI_EINVAL; 2596 } 2597 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2598 return JNI_EINVAL; 2599 } 2600 // -Xms 2601 } else if (match_option(option, "-Xms", &tail)) { 2602 julong size = 0; 2603 // an initial heap size of 0 means automatically determine 2604 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2605 if (errcode != arg_in_range) { 2606 jio_fprintf(defaultStream::error_stream(), 2607 "Invalid initial heap size: %s\n", option->optionString); 2608 describe_range_error(errcode); 2609 return JNI_EINVAL; 2610 } 2611 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2612 return JNI_EINVAL; 2613 } 2614 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2615 return JNI_EINVAL; 2616 } 2617 // -Xmx 2618 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2619 julong long_max_heap_size = 0; 2620 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2621 if (errcode != arg_in_range) { 2622 jio_fprintf(defaultStream::error_stream(), 2623 "Invalid maximum heap size: %s\n", option->optionString); 2624 describe_range_error(errcode); 2625 return JNI_EINVAL; 2626 } 2627 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2628 return JNI_EINVAL; 2629 } 2630 // Xmaxf 2631 } else if (match_option(option, "-Xmaxf", &tail)) { 2632 char* err; 2633 int maxf = (int)(strtod(tail, &err) * 100); 2634 if (*err != '\0' || *tail == '\0') { 2635 jio_fprintf(defaultStream::error_stream(), 2636 "Bad max heap free percentage size: %s\n", 2637 option->optionString); 2638 return JNI_EINVAL; 2639 } else { 2640 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2641 return JNI_EINVAL; 2642 } 2643 } 2644 // Xminf 2645 } else if (match_option(option, "-Xminf", &tail)) { 2646 char* err; 2647 int minf = (int)(strtod(tail, &err) * 100); 2648 if (*err != '\0' || *tail == '\0') { 2649 jio_fprintf(defaultStream::error_stream(), 2650 "Bad min heap free percentage size: %s\n", 2651 option->optionString); 2652 return JNI_EINVAL; 2653 } else { 2654 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2655 return JNI_EINVAL; 2656 } 2657 } 2658 // -Xss 2659 } else if (match_option(option, "-Xss", &tail)) { 2660 intx value = 0; 2661 jint err = parse_xss(option, tail, &value); 2662 if (err != JNI_OK) { 2663 return err; 2664 } 2665 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2666 return JNI_EINVAL; 2667 } 2668 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2669 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2670 julong long_ReservedCodeCacheSize = 0; 2671 2672 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2673 if (errcode != arg_in_range) { 2674 jio_fprintf(defaultStream::error_stream(), 2675 "Invalid maximum code cache size: %s.\n", option->optionString); 2676 return JNI_EINVAL; 2677 } 2678 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2679 return JNI_EINVAL; 2680 } 2681 // -green 2682 } else if (match_option(option, "-green")) { 2683 jio_fprintf(defaultStream::error_stream(), 2684 "Green threads support not available\n"); 2685 return JNI_EINVAL; 2686 // -native 2687 } else if (match_option(option, "-native")) { 2688 // HotSpot always uses native threads, ignore silently for compatibility 2689 // -Xrs 2690 } else if (match_option(option, "-Xrs")) { 2691 // Classic/EVM option, new functionality 2692 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2693 return JNI_EINVAL; 2694 } 2695 // -Xprof 2696 } else if (match_option(option, "-Xprof")) { 2697 char version[256]; 2698 // Obsolete in JDK 10 2699 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2700 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2701 // -Xinternalversion 2702 } else if (match_option(option, "-Xinternalversion")) { 2703 jio_fprintf(defaultStream::output_stream(), "%s\n", 2704 VM_Version::internal_vm_info_string()); 2705 vm_exit(0); 2706 #ifndef PRODUCT 2707 // -Xprintflags 2708 } else if (match_option(option, "-Xprintflags")) { 2709 JVMFlag::printFlags(tty, false); 2710 vm_exit(0); 2711 #endif 2712 // -D 2713 } else if (match_option(option, "-D", &tail)) { 2714 const char* value; 2715 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2716 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2717 // abort if -Djava.endorsed.dirs is set 2718 jio_fprintf(defaultStream::output_stream(), 2719 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2720 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2721 return JNI_EINVAL; 2722 } 2723 if (match_option(option, "-Djava.ext.dirs=", &value) && 2724 *value != '\0' && strcmp(value, "\"\"") != 0) { 2725 // abort if -Djava.ext.dirs is set 2726 jio_fprintf(defaultStream::output_stream(), 2727 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2728 return JNI_EINVAL; 2729 } 2730 // Check for module related properties. They must be set using the modules 2731 // options. For example: use "--add-modules=java.sql", not 2732 // "-Djdk.module.addmods=java.sql" 2733 if (is_internal_module_property(option->optionString + 2)) { 2734 needs_module_property_warning = true; 2735 continue; 2736 } 2737 if (!add_property(tail)) { 2738 return JNI_ENOMEM; 2739 } 2740 // Out of the box management support 2741 if (match_option(option, "-Dcom.sun.management", &tail)) { 2742 #if INCLUDE_MANAGEMENT 2743 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2744 return JNI_EINVAL; 2745 } 2746 // management agent in module jdk.management.agent 2747 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2748 return JNI_ENOMEM; 2749 } 2750 #else 2751 jio_fprintf(defaultStream::output_stream(), 2752 "-Dcom.sun.management is not supported in this VM.\n"); 2753 return JNI_ERR; 2754 #endif 2755 } 2756 // -Xint 2757 } else if (match_option(option, "-Xint")) { 2758 set_mode_flags(_int); 2759 // -Xmixed 2760 } else if (match_option(option, "-Xmixed")) { 2761 set_mode_flags(_mixed); 2762 // -Xcomp 2763 } else if (match_option(option, "-Xcomp")) { 2764 // for testing the compiler; turn off all flags that inhibit compilation 2765 set_mode_flags(_comp); 2766 // -Xshare:dump 2767 } else if (match_option(option, "-Xshare:dump")) { 2768 DumpSharedSpaces = true; 2769 // -Xshare:on 2770 } else if (match_option(option, "-Xshare:on")) { 2771 UseSharedSpaces = true; 2772 RequireSharedSpaces = true; 2773 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2774 } else if (match_option(option, "-Xshare:auto")) { 2775 UseSharedSpaces = true; 2776 RequireSharedSpaces = false; 2777 xshare_auto_cmd_line = true; 2778 // -Xshare:off 2779 } else if (match_option(option, "-Xshare:off")) { 2780 UseSharedSpaces = false; 2781 RequireSharedSpaces = false; 2782 // -Xverify 2783 } else if (match_option(option, "-Xverify", &tail)) { 2784 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2785 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2786 return JNI_EINVAL; 2787 } 2788 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2789 return JNI_EINVAL; 2790 } 2791 } else if (strcmp(tail, ":remote") == 0) { 2792 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2793 return JNI_EINVAL; 2794 } 2795 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2796 return JNI_EINVAL; 2797 } 2798 } else if (strcmp(tail, ":none") == 0) { 2799 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2800 return JNI_EINVAL; 2801 } 2802 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2803 return JNI_EINVAL; 2804 } 2805 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2806 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2807 return JNI_EINVAL; 2808 } 2809 // -Xdebug 2810 } else if (match_option(option, "-Xdebug")) { 2811 // note this flag has been used, then ignore 2812 set_xdebug_mode(true); 2813 // -Xnoagent 2814 } else if (match_option(option, "-Xnoagent")) { 2815 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2816 } else if (match_option(option, "-Xloggc:", &tail)) { 2817 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2818 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2819 _legacyGCLogging.lastFlag = 2; 2820 _legacyGCLogging.file = os::strdup_check_oom(tail); 2821 } else if (match_option(option, "-Xlog", &tail)) { 2822 bool ret = false; 2823 if (strcmp(tail, ":help") == 0) { 2824 fileStream stream(defaultStream::output_stream()); 2825 LogConfiguration::print_command_line_help(&stream); 2826 vm_exit(0); 2827 } else if (strcmp(tail, ":disable") == 0) { 2828 LogConfiguration::disable_logging(); 2829 ret = true; 2830 } else if (strcmp(tail, ":async") == 0) { 2831 LogConfiguration::set_async_mode(true); 2832 ret = true; 2833 } else if (*tail == '\0') { 2834 ret = LogConfiguration::parse_command_line_arguments(); 2835 assert(ret, "-Xlog without arguments should never fail to parse"); 2836 } else if (*tail == ':') { 2837 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2838 } 2839 if (ret == false) { 2840 jio_fprintf(defaultStream::error_stream(), 2841 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2842 tail); 2843 return JNI_EINVAL; 2844 } 2845 // JNI hooks 2846 } else if (match_option(option, "-Xcheck", &tail)) { 2847 if (!strcmp(tail, ":jni")) { 2848 #if !INCLUDE_JNI_CHECK 2849 warning("JNI CHECKING is not supported in this VM"); 2850 #else 2851 CheckJNICalls = true; 2852 #endif // INCLUDE_JNI_CHECK 2853 } else if (is_bad_option(option, args->ignoreUnrecognized, 2854 "check")) { 2855 return JNI_EINVAL; 2856 } 2857 } else if (match_option(option, "vfprintf")) { 2858 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2859 } else if (match_option(option, "exit")) { 2860 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2861 } else if (match_option(option, "abort")) { 2862 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2863 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2864 // and the last option wins. 2865 } else if (match_option(option, "-XX:+NeverTenure")) { 2866 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2867 return JNI_EINVAL; 2868 } 2869 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2870 return JNI_EINVAL; 2871 } 2872 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2873 return JNI_EINVAL; 2874 } 2875 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2876 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2877 return JNI_EINVAL; 2878 } 2879 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2880 return JNI_EINVAL; 2881 } 2882 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2883 return JNI_EINVAL; 2884 } 2885 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2886 uintx max_tenuring_thresh = 0; 2887 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2888 jio_fprintf(defaultStream::error_stream(), 2889 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2890 return JNI_EINVAL; 2891 } 2892 2893 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2894 return JNI_EINVAL; 2895 } 2896 2897 if (MaxTenuringThreshold == 0) { 2898 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2899 return JNI_EINVAL; 2900 } 2901 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2902 return JNI_EINVAL; 2903 } 2904 } else { 2905 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2906 return JNI_EINVAL; 2907 } 2908 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2909 return JNI_EINVAL; 2910 } 2911 } 2912 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2913 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2914 return JNI_EINVAL; 2915 } 2916 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2917 return JNI_EINVAL; 2918 } 2919 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2920 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2921 return JNI_EINVAL; 2922 } 2923 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2924 return JNI_EINVAL; 2925 } 2926 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2927 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2928 return JNI_EINVAL; 2929 } 2930 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2931 return JNI_EINVAL; 2932 } 2933 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2934 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2935 return JNI_EINVAL; 2936 } 2937 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2938 return JNI_EINVAL; 2939 } 2940 } else if (match_option(option, "--finalization=", &tail)) { 2941 if (strcmp(tail, "enabled") == 0) { 2942 InstanceKlass::set_finalization_enabled(true); 2943 } else if (strcmp(tail, "disabled") == 0) { 2944 InstanceKlass::set_finalization_enabled(false); 2945 } else { 2946 jio_fprintf(defaultStream::error_stream(), 2947 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2948 tail); 2949 return JNI_EINVAL; 2950 } 2951 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 2952 #if defined(DTRACE_ENABLED) 2953 warning("Option ExtendedDTraceProbes was deprecated in version 19 and will likely be removed in a future release."); 2954 warning("Use the combination of -XX:+DTraceMethodProbes, -XX:+DTraceAllocProbes and -XX:+DTraceMonitorProbes instead."); 2955 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 2956 return JNI_EINVAL; 2957 } 2958 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 2959 return JNI_EINVAL; 2960 } 2961 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 2962 return JNI_EINVAL; 2963 } 2964 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 2965 return JNI_EINVAL; 2966 } 2967 #else // defined(DTRACE_ENABLED) 2968 jio_fprintf(defaultStream::error_stream(), 2969 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2970 return JNI_EINVAL; 2971 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2972 jio_fprintf(defaultStream::error_stream(), 2973 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2974 return JNI_EINVAL; 2975 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2976 jio_fprintf(defaultStream::error_stream(), 2977 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2978 return JNI_EINVAL; 2979 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2980 jio_fprintf(defaultStream::error_stream(), 2981 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2982 return JNI_EINVAL; 2983 #endif // defined(DTRACE_ENABLED) 2984 #ifdef ASSERT 2985 } else if (match_option(option, "-XX:+FullGCALot")) { 2986 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2987 return JNI_EINVAL; 2988 } 2989 // disable scavenge before parallel mark-compact 2990 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2991 return JNI_EINVAL; 2992 } 2993 #endif 2994 #if !INCLUDE_MANAGEMENT 2995 } else if (match_option(option, "-XX:+ManagementServer")) { 2996 jio_fprintf(defaultStream::error_stream(), 2997 "ManagementServer is not supported in this VM.\n"); 2998 return JNI_ERR; 2999 #endif // INCLUDE_MANAGEMENT 3000 #if INCLUDE_JVMCI 3001 } else if (match_option(option, "-XX:-EnableJVMCIProduct")) { 3002 if (EnableJVMCIProduct) { 3003 jio_fprintf(defaultStream::error_stream(), 3004 "-XX:-EnableJVMCIProduct cannot come after -XX:+EnableJVMCIProduct\n"); 3005 return JNI_EINVAL; 3006 } 3007 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) { 3008 // Just continue, since "-XX:+EnableJVMCIProduct" has been specified before 3009 if (EnableJVMCIProduct) { 3010 continue; 3011 } 3012 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 3013 // Allow this flag if it has been unlocked. 3014 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) { 3015 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) { 3016 jio_fprintf(defaultStream::error_stream(), 3017 "Unable to enable JVMCI in product mode"); 3018 return JNI_ERR; 3019 } 3020 } 3021 // The flag was locked so process normally to report that error 3022 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 3023 return JNI_EINVAL; 3024 } 3025 #endif // INCLUDE_JVMCI 3026 #if INCLUDE_JFR 3027 } else if (match_jfr_option(&option)) { 3028 return JNI_EINVAL; 3029 #endif 3030 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3031 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3032 // already been handled 3033 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3034 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3035 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3036 return JNI_EINVAL; 3037 } 3038 } 3039 // Unknown option 3040 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3041 return JNI_ERR; 3042 } 3043 } 3044 3045 // PrintSharedArchiveAndExit will turn on 3046 // -Xshare:on 3047 // -Xlog:class+path=info 3048 if (PrintSharedArchiveAndExit) { 3049 UseSharedSpaces = true; 3050 RequireSharedSpaces = true; 3051 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3052 } 3053 3054 fix_appclasspath(); 3055 3056 return JNI_OK; 3057 } 3058 3059 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3060 // For java.base check for duplicate --patch-module options being specified on the command line. 3061 // This check is only required for java.base, all other duplicate module specifications 3062 // will be checked during module system initialization. The module system initialization 3063 // will throw an ExceptionInInitializerError if this situation occurs. 3064 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3065 if (*patch_mod_javabase) { 3066 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3067 } else { 3068 *patch_mod_javabase = true; 3069 } 3070 } 3071 3072 // Create GrowableArray lazily, only if --patch-module has been specified 3073 if (_patch_mod_prefix == NULL) { 3074 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 3075 } 3076 3077 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3078 } 3079 3080 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3081 // 3082 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3083 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3084 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3085 // path is treated as the current directory. 3086 // 3087 // This causes problems with CDS, which requires that all directories specified in the classpath 3088 // must be empty. In most cases, applications do NOT want to load classes from the current 3089 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3090 // scripts compatible with CDS. 3091 void Arguments::fix_appclasspath() { 3092 if (IgnoreEmptyClassPaths) { 3093 const char separator = *os::path_separator(); 3094 const char* src = _java_class_path->value(); 3095 3096 // skip over all the leading empty paths 3097 while (*src == separator) { 3098 src ++; 3099 } 3100 3101 char* copy = os::strdup_check_oom(src, mtArguments); 3102 3103 // trim all trailing empty paths 3104 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3105 *tail = '\0'; 3106 } 3107 3108 char from[3] = {separator, separator, '\0'}; 3109 char to [2] = {separator, '\0'}; 3110 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3111 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3112 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3113 } 3114 3115 _java_class_path->set_writeable_value(copy); 3116 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3117 } 3118 } 3119 3120 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3121 // check if the default lib/endorsed directory exists; if so, error 3122 char path[JVM_MAXPATHLEN]; 3123 const char* fileSep = os::file_separator(); 3124 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3125 3126 DIR* dir = os::opendir(path); 3127 if (dir != NULL) { 3128 jio_fprintf(defaultStream::output_stream(), 3129 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3130 "in modular form will be supported via the concept of upgradeable modules.\n"); 3131 os::closedir(dir); 3132 return JNI_ERR; 3133 } 3134 3135 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3136 dir = os::opendir(path); 3137 if (dir != NULL) { 3138 jio_fprintf(defaultStream::output_stream(), 3139 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3140 "Use -classpath instead.\n."); 3141 os::closedir(dir); 3142 return JNI_ERR; 3143 } 3144 3145 // This must be done after all arguments have been processed 3146 // and the container support has been initialized since AggressiveHeap 3147 // relies on the amount of total memory available. 3148 if (AggressiveHeap) { 3149 jint result = set_aggressive_heap_flags(); 3150 if (result != JNI_OK) { 3151 return result; 3152 } 3153 } 3154 3155 // This must be done after all arguments have been processed. 3156 // java_compiler() true means set to "NONE" or empty. 3157 if (java_compiler() && !xdebug_mode()) { 3158 // For backwards compatibility, we switch to interpreted mode if 3159 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3160 // not specified. 3161 set_mode_flags(_int); 3162 } 3163 3164 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3165 // but like -Xint, leave compilation thresholds unaffected. 3166 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3167 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3168 set_mode_flags(_int); 3169 } 3170 3171 #ifdef ZERO 3172 // Zero always runs in interpreted mode 3173 set_mode_flags(_int); 3174 #endif 3175 3176 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3177 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3178 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3179 } 3180 3181 #if !COMPILER2_OR_JVMCI 3182 // Don't degrade server performance for footprint 3183 if (FLAG_IS_DEFAULT(UseLargePages) && 3184 MaxHeapSize < LargePageHeapSizeThreshold) { 3185 // No need for large granularity pages w/small heaps. 3186 // Note that large pages are enabled/disabled for both the 3187 // Java heap and the code cache. 3188 FLAG_SET_DEFAULT(UseLargePages, false); 3189 } 3190 3191 UNSUPPORTED_OPTION(ProfileInterpreter); 3192 #endif 3193 3194 // Parse the CompilationMode flag 3195 if (!CompilationModeFlag::initialize()) { 3196 return JNI_ERR; 3197 } 3198 3199 if (!check_vm_args_consistency()) { 3200 return JNI_ERR; 3201 } 3202 3203 #if INCLUDE_CDS 3204 if (DumpSharedSpaces) { 3205 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3206 // unsafe with -Xshare:dump (which modifies the class metadata in place). Let's disable 3207 // compiler just to be safe. 3208 // 3209 // Note: this is not a concern for dynamically dumping shared spaces, which makes a copy of the 3210 // class metadata instead of modifying them in place. The copy is inaccessible to the compiler. 3211 // TODO: revisit the following for the static archive case. 3212 set_mode_flags(_int); 3213 } 3214 3215 // RecordDynamicDumpInfo is not compatible with ArchiveClassesAtExit 3216 if (ArchiveClassesAtExit != NULL && RecordDynamicDumpInfo) { 3217 jio_fprintf(defaultStream::output_stream(), 3218 "-XX:+RecordDynamicDumpInfo cannot be used with -XX:ArchiveClassesAtExit.\n"); 3219 return JNI_ERR; 3220 } 3221 3222 if (ArchiveClassesAtExit == NULL && !RecordDynamicDumpInfo) { 3223 DynamicDumpSharedSpaces = false; 3224 } else { 3225 DynamicDumpSharedSpaces = true; 3226 } 3227 3228 if (AutoCreateSharedArchive) { 3229 if (SharedArchiveFile == NULL) { 3230 log_warning(cds)("-XX:+AutoCreateSharedArchive requires -XX:SharedArchiveFile"); 3231 return JNI_ERR; 3232 } 3233 if (ArchiveClassesAtExit != NULL) { 3234 log_warning(cds)("-XX:+AutoCreateSharedArchive does not work with ArchiveClassesAtExit"); 3235 return JNI_ERR; 3236 } 3237 } 3238 3239 if (UseSharedSpaces && patch_mod_javabase) { 3240 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3241 } 3242 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3243 UseSharedSpaces = false; 3244 } 3245 3246 if (DumpSharedSpaces || DynamicDumpSharedSpaces) { 3247 // Always verify non-system classes during CDS dump 3248 if (!BytecodeVerificationRemote) { 3249 BytecodeVerificationRemote = true; 3250 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3251 } 3252 } 3253 #endif 3254 3255 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3256 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3257 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3258 3259 return JNI_OK; 3260 } 3261 3262 // Helper class for controlling the lifetime of JavaVMInitArgs 3263 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3264 // deleted on the destruction of the ScopedVMInitArgs object. 3265 class ScopedVMInitArgs : public StackObj { 3266 private: 3267 JavaVMInitArgs _args; 3268 char* _container_name; 3269 bool _is_set; 3270 char* _vm_options_file_arg; 3271 3272 public: 3273 ScopedVMInitArgs(const char *container_name) { 3274 _args.version = JNI_VERSION_1_2; 3275 _args.nOptions = 0; 3276 _args.options = NULL; 3277 _args.ignoreUnrecognized = false; 3278 _container_name = (char *)container_name; 3279 _is_set = false; 3280 _vm_options_file_arg = NULL; 3281 } 3282 3283 // Populates the JavaVMInitArgs object represented by this 3284 // ScopedVMInitArgs object with the arguments in options. The 3285 // allocated memory is deleted by the destructor. If this method 3286 // returns anything other than JNI_OK, then this object is in a 3287 // partially constructed state, and should be abandoned. 3288 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3289 _is_set = true; 3290 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3291 JavaVMOption, options->length(), mtArguments); 3292 if (options_arr == NULL) { 3293 return JNI_ENOMEM; 3294 } 3295 _args.options = options_arr; 3296 3297 for (int i = 0; i < options->length(); i++) { 3298 options_arr[i] = options->at(i); 3299 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3300 if (options_arr[i].optionString == NULL) { 3301 // Rely on the destructor to do cleanup. 3302 _args.nOptions = i; 3303 return JNI_ENOMEM; 3304 } 3305 } 3306 3307 _args.nOptions = options->length(); 3308 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3309 return JNI_OK; 3310 } 3311 3312 JavaVMInitArgs* get() { return &_args; } 3313 char* container_name() { return _container_name; } 3314 bool is_set() { return _is_set; } 3315 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3316 char* vm_options_file_arg() { return _vm_options_file_arg; } 3317 3318 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3319 if (_vm_options_file_arg != NULL) { 3320 os::free(_vm_options_file_arg); 3321 } 3322 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3323 } 3324 3325 ~ScopedVMInitArgs() { 3326 if (_vm_options_file_arg != NULL) { 3327 os::free(_vm_options_file_arg); 3328 } 3329 if (_args.options == NULL) return; 3330 for (int i = 0; i < _args.nOptions; i++) { 3331 os::free(_args.options[i].optionString); 3332 } 3333 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3334 } 3335 3336 // Insert options into this option list, to replace option at 3337 // vm_options_file_pos (-XX:VMOptionsFile) 3338 jint insert(const JavaVMInitArgs* args, 3339 const JavaVMInitArgs* args_to_insert, 3340 const int vm_options_file_pos) { 3341 assert(_args.options == NULL, "shouldn't be set yet"); 3342 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3343 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3344 3345 int length = args->nOptions + args_to_insert->nOptions - 1; 3346 // Construct new option array 3347 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3348 for (int i = 0; i < args->nOptions; i++) { 3349 if (i == vm_options_file_pos) { 3350 // insert the new options starting at the same place as the 3351 // -XX:VMOptionsFile option 3352 for (int j = 0; j < args_to_insert->nOptions; j++) { 3353 options.push(args_to_insert->options[j]); 3354 } 3355 } else { 3356 options.push(args->options[i]); 3357 } 3358 } 3359 // make into options array 3360 return set_args(&options); 3361 } 3362 }; 3363 3364 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3365 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3366 } 3367 3368 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3369 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3370 } 3371 3372 jint Arguments::parse_options_environment_variable(const char* name, 3373 ScopedVMInitArgs* vm_args) { 3374 char *buffer = ::getenv(name); 3375 3376 // Don't check this environment variable if user has special privileges 3377 // (e.g. unix su command). 3378 if (buffer == NULL || os::have_special_privileges()) { 3379 return JNI_OK; 3380 } 3381 3382 if ((buffer = os::strdup(buffer)) == NULL) { 3383 return JNI_ENOMEM; 3384 } 3385 3386 jio_fprintf(defaultStream::error_stream(), 3387 "Picked up %s: %s\n", name, buffer); 3388 3389 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3390 3391 os::free(buffer); 3392 return retcode; 3393 } 3394 3395 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3396 // read file into buffer 3397 int fd = ::open(file_name, O_RDONLY); 3398 if (fd < 0) { 3399 jio_fprintf(defaultStream::error_stream(), 3400 "Could not open options file '%s'\n", 3401 file_name); 3402 return JNI_ERR; 3403 } 3404 3405 struct stat stbuf; 3406 int retcode = os::stat(file_name, &stbuf); 3407 if (retcode != 0) { 3408 jio_fprintf(defaultStream::error_stream(), 3409 "Could not stat options file '%s'\n", 3410 file_name); 3411 ::close(fd); 3412 return JNI_ERR; 3413 } 3414 3415 if (stbuf.st_size == 0) { 3416 // tell caller there is no option data and that is ok 3417 ::close(fd); 3418 return JNI_OK; 3419 } 3420 3421 // '+ 1' for NULL termination even with max bytes 3422 size_t bytes_alloc = stbuf.st_size + 1; 3423 3424 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3425 if (NULL == buf) { 3426 jio_fprintf(defaultStream::error_stream(), 3427 "Could not allocate read buffer for options file parse\n"); 3428 ::close(fd); 3429 return JNI_ENOMEM; 3430 } 3431 3432 memset(buf, 0, bytes_alloc); 3433 3434 // Fill buffer 3435 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3436 ::close(fd); 3437 if (bytes_read < 0) { 3438 FREE_C_HEAP_ARRAY(char, buf); 3439 jio_fprintf(defaultStream::error_stream(), 3440 "Could not read options file '%s'\n", file_name); 3441 return JNI_ERR; 3442 } 3443 3444 if (bytes_read == 0) { 3445 // tell caller there is no option data and that is ok 3446 FREE_C_HEAP_ARRAY(char, buf); 3447 return JNI_OK; 3448 } 3449 3450 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3451 3452 FREE_C_HEAP_ARRAY(char, buf); 3453 return retcode; 3454 } 3455 3456 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3457 // Construct option array 3458 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3459 3460 // some pointers to help with parsing 3461 char *buffer_end = buffer + buf_len; 3462 char *opt_hd = buffer; 3463 char *wrt = buffer; 3464 char *rd = buffer; 3465 3466 // parse all options 3467 while (rd < buffer_end) { 3468 // skip leading white space from the input string 3469 while (rd < buffer_end && isspace(*rd)) { 3470 rd++; 3471 } 3472 3473 if (rd >= buffer_end) { 3474 break; 3475 } 3476 3477 // Remember this is where we found the head of the token. 3478 opt_hd = wrt; 3479 3480 // Tokens are strings of non white space characters separated 3481 // by one or more white spaces. 3482 while (rd < buffer_end && !isspace(*rd)) { 3483 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3484 int quote = *rd; // matching quote to look for 3485 rd++; // don't copy open quote 3486 while (rd < buffer_end && *rd != quote) { 3487 // include everything (even spaces) 3488 // up until the close quote 3489 *wrt++ = *rd++; // copy to option string 3490 } 3491 3492 if (rd < buffer_end) { 3493 rd++; // don't copy close quote 3494 } else { 3495 // did not see closing quote 3496 jio_fprintf(defaultStream::error_stream(), 3497 "Unmatched quote in %s\n", name); 3498 return JNI_ERR; 3499 } 3500 } else { 3501 *wrt++ = *rd++; // copy to option string 3502 } 3503 } 3504 3505 // steal a white space character and set it to NULL 3506 *wrt++ = '\0'; 3507 // We now have a complete token 3508 3509 JavaVMOption option; 3510 option.optionString = opt_hd; 3511 option.extraInfo = NULL; 3512 3513 options.append(option); // Fill in option 3514 3515 rd++; // Advance to next character 3516 } 3517 3518 // Fill out JavaVMInitArgs structure. 3519 return vm_args->set_args(&options); 3520 } 3521 3522 void Arguments::set_shared_spaces_flags_and_archive_paths() { 3523 if (DumpSharedSpaces) { 3524 if (RequireSharedSpaces) { 3525 warning("Cannot dump shared archive while using shared archive"); 3526 } 3527 UseSharedSpaces = false; 3528 } 3529 #if INCLUDE_CDS 3530 // Initialize shared archive paths which could include both base and dynamic archive paths 3531 // This must be after set_ergonomics_flags() called so flag UseCompressedOops is set properly. 3532 // 3533 // UseSharedSpaces may be disabled if -XX:SharedArchiveFile is invalid. 3534 if (DumpSharedSpaces || UseSharedSpaces) { 3535 init_shared_archive_paths(); 3536 } 3537 #endif // INCLUDE_CDS 3538 } 3539 3540 #if INCLUDE_CDS 3541 // Sharing support 3542 // Construct the path to the archive 3543 char* Arguments::get_default_shared_archive_path() { 3544 char *default_archive_path; 3545 char jvm_path[JVM_MAXPATHLEN]; 3546 os::jvm_path(jvm_path, sizeof(jvm_path)); 3547 char *end = strrchr(jvm_path, *os::file_separator()); 3548 if (end != NULL) *end = '\0'; 3549 size_t jvm_path_len = strlen(jvm_path); 3550 size_t file_sep_len = strlen(os::file_separator()); 3551 const size_t len = jvm_path_len + file_sep_len + 20; 3552 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3553 jio_snprintf(default_archive_path, len, 3554 LP64_ONLY(!UseCompressedOops ? "%s%sclasses_nocoops.jsa":) "%s%sclasses.jsa", 3555 jvm_path, os::file_separator()); 3556 return default_archive_path; 3557 } 3558 3559 int Arguments::num_archives(const char* archive_path) { 3560 if (archive_path == NULL) { 3561 return 0; 3562 } 3563 int npaths = 1; 3564 char* p = (char*)archive_path; 3565 while (*p != '\0') { 3566 if (*p == os::path_separator()[0]) { 3567 npaths++; 3568 } 3569 p++; 3570 } 3571 return npaths; 3572 } 3573 3574 void Arguments::extract_shared_archive_paths(const char* archive_path, 3575 char** base_archive_path, 3576 char** top_archive_path) { 3577 char* begin_ptr = (char*)archive_path; 3578 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3579 if (end_ptr == NULL || end_ptr == begin_ptr) { 3580 vm_exit_during_initialization("Base archive was not specified", archive_path); 3581 } 3582 size_t len = end_ptr - begin_ptr; 3583 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3584 strncpy(cur_path, begin_ptr, len); 3585 cur_path[len] = '\0'; 3586 *base_archive_path = cur_path; 3587 3588 begin_ptr = ++end_ptr; 3589 if (*begin_ptr == '\0') { 3590 vm_exit_during_initialization("Top archive was not specified", archive_path); 3591 } 3592 end_ptr = strchr(begin_ptr, '\0'); 3593 assert(end_ptr != NULL, "sanity"); 3594 len = end_ptr - begin_ptr; 3595 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3596 strncpy(cur_path, begin_ptr, len + 1); 3597 *top_archive_path = cur_path; 3598 } 3599 3600 void Arguments::init_shared_archive_paths() { 3601 if (ArchiveClassesAtExit != nullptr) { 3602 assert(!RecordDynamicDumpInfo, "already checked"); 3603 if (DumpSharedSpaces) { 3604 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3605 } 3606 check_unsupported_dumping_properties(); 3607 3608 if (os::same_files((const char*)get_default_shared_archive_path(), ArchiveClassesAtExit)) { 3609 vm_exit_during_initialization( 3610 "Cannot specify the default CDS archive for -XX:ArchiveClassesAtExit", get_default_shared_archive_path()); 3611 } 3612 } 3613 3614 if (SharedArchiveFile == nullptr) { 3615 SharedArchivePath = get_default_shared_archive_path(); 3616 } else { 3617 int archives = num_archives(SharedArchiveFile); 3618 assert(archives > 0, "must be"); 3619 3620 if (is_dumping_archive() && archives > 1) { 3621 vm_exit_during_initialization( 3622 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3623 } 3624 3625 if (DumpSharedSpaces) { 3626 assert(archives == 1, "must be"); 3627 // Static dump is simple: only one archive is allowed in SharedArchiveFile. This file 3628 // will be overwritten no matter regardless of its contents 3629 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3630 } else { 3631 // SharedArchiveFile may specify one or two files. In case (c), the path for base.jsa 3632 // is read from top.jsa 3633 // (a) 1 file: -XX:SharedArchiveFile=base.jsa 3634 // (b) 2 files: -XX:SharedArchiveFile=base.jsa:top.jsa 3635 // (c) 2 files: -XX:SharedArchiveFile=top.jsa 3636 // 3637 // However, if either RecordDynamicDumpInfo or ArchiveClassesAtExit is used, we do not 3638 // allow cases (b) and (c). Case (b) is already checked above. 3639 3640 if (archives > 2) { 3641 vm_exit_during_initialization( 3642 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3643 } 3644 if (archives == 1) { 3645 char* base_archive_path = NULL; 3646 bool success = 3647 FileMapInfo::get_base_archive_name_from_header(SharedArchiveFile, &base_archive_path); 3648 if (!success) { 3649 // If +AutoCreateSharedArchive and the specified shared archive does not exist, 3650 // regenerate the dynamic archive base on default archive. 3651 if (AutoCreateSharedArchive && !os::file_exists(SharedArchiveFile)) { 3652 DynamicDumpSharedSpaces = true; 3653 ArchiveClassesAtExit = const_cast<char *>(SharedArchiveFile); 3654 SharedArchivePath = get_default_shared_archive_path(); 3655 SharedArchiveFile = nullptr; 3656 } else { 3657 if (AutoCreateSharedArchive) { 3658 warning("-XX:+AutoCreateSharedArchive is unsupported when base CDS archive is not loaded. Run with -Xlog:cds for more info."); 3659 AutoCreateSharedArchive = false; 3660 } 3661 no_shared_spaces("invalid archive"); 3662 } 3663 } else if (base_archive_path == NULL) { 3664 // User has specified a single archive, which is a static archive. 3665 SharedArchivePath = const_cast<char *>(SharedArchiveFile); 3666 } else { 3667 // User has specified a single archive, which is a dynamic archive. 3668 SharedDynamicArchivePath = const_cast<char *>(SharedArchiveFile); 3669 SharedArchivePath = base_archive_path; // has been c-heap allocated. 3670 } 3671 } else { 3672 extract_shared_archive_paths((const char*)SharedArchiveFile, 3673 &SharedArchivePath, &SharedDynamicArchivePath); 3674 if (SharedArchivePath == NULL) { 3675 assert(SharedDynamicArchivePath == NULL, "must be"); 3676 no_shared_spaces("invalid archive"); 3677 } 3678 } 3679 3680 if (SharedDynamicArchivePath != nullptr) { 3681 // Check for case (c) 3682 if (RecordDynamicDumpInfo) { 3683 vm_exit_during_initialization("-XX:+RecordDynamicDumpInfo is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3684 SharedArchiveFile); 3685 } 3686 if (ArchiveClassesAtExit != nullptr) { 3687 vm_exit_during_initialization("-XX:ArchiveClassesAtExit is unsupported when a dynamic CDS archive is specified in -XX:SharedArchiveFile", 3688 SharedArchiveFile); 3689 } 3690 } 3691 3692 if (ArchiveClassesAtExit != nullptr && os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3693 vm_exit_during_initialization( 3694 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3695 SharedArchiveFile); 3696 } 3697 } 3698 } 3699 } 3700 #endif // INCLUDE_CDS 3701 3702 #ifndef PRODUCT 3703 // Determine whether LogVMOutput should be implicitly turned on. 3704 static bool use_vm_log() { 3705 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3706 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3707 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3708 PrintAssembly || TraceDeoptimization || TraceDependencies || 3709 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3710 return true; 3711 } 3712 3713 #ifdef COMPILER1 3714 if (PrintC1Statistics) { 3715 return true; 3716 } 3717 #endif // COMPILER1 3718 3719 #ifdef COMPILER2 3720 if (PrintOptoAssembly || PrintOptoStatistics) { 3721 return true; 3722 } 3723 #endif // COMPILER2 3724 3725 return false; 3726 } 3727 3728 #endif // PRODUCT 3729 3730 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3731 for (int index = 0; index < args->nOptions; index++) { 3732 const JavaVMOption* option = args->options + index; 3733 const char* tail; 3734 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3735 return true; 3736 } 3737 } 3738 return false; 3739 } 3740 3741 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3742 const char* vm_options_file, 3743 const int vm_options_file_pos, 3744 ScopedVMInitArgs* vm_options_file_args, 3745 ScopedVMInitArgs* args_out) { 3746 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3747 if (code != JNI_OK) { 3748 return code; 3749 } 3750 3751 if (vm_options_file_args->get()->nOptions < 1) { 3752 return JNI_OK; 3753 } 3754 3755 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3756 jio_fprintf(defaultStream::error_stream(), 3757 "A VM options file may not refer to a VM options file. " 3758 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3759 "options file '%s' in options container '%s' is an error.\n", 3760 vm_options_file_args->vm_options_file_arg(), 3761 vm_options_file_args->container_name()); 3762 return JNI_EINVAL; 3763 } 3764 3765 return args_out->insert(args, vm_options_file_args->get(), 3766 vm_options_file_pos); 3767 } 3768 3769 // Expand -XX:VMOptionsFile found in args_in as needed. 3770 // mod_args and args_out parameters may return values as needed. 3771 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3772 ScopedVMInitArgs* mod_args, 3773 JavaVMInitArgs** args_out) { 3774 jint code = match_special_option_and_act(args_in, mod_args); 3775 if (code != JNI_OK) { 3776 return code; 3777 } 3778 3779 if (mod_args->is_set()) { 3780 // args_in contains -XX:VMOptionsFile and mod_args contains the 3781 // original options from args_in along with the options expanded 3782 // from the VMOptionsFile. Return a short-hand to the caller. 3783 *args_out = mod_args->get(); 3784 } else { 3785 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3786 } 3787 return JNI_OK; 3788 } 3789 3790 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3791 ScopedVMInitArgs* args_out) { 3792 // Remaining part of option string 3793 const char* tail; 3794 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3795 3796 for (int index = 0; index < args->nOptions; index++) { 3797 const JavaVMOption* option = args->options + index; 3798 if (match_option(option, "-XX:Flags=", &tail)) { 3799 Arguments::set_jvm_flags_file(tail); 3800 continue; 3801 } 3802 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3803 if (vm_options_file_args.found_vm_options_file_arg()) { 3804 jio_fprintf(defaultStream::error_stream(), 3805 "The option '%s' is already specified in the options " 3806 "container '%s' so the specification of '%s' in the " 3807 "same options container is an error.\n", 3808 vm_options_file_args.vm_options_file_arg(), 3809 vm_options_file_args.container_name(), 3810 option->optionString); 3811 return JNI_EINVAL; 3812 } 3813 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3814 // If there's a VMOptionsFile, parse that 3815 jint code = insert_vm_options_file(args, tail, index, 3816 &vm_options_file_args, args_out); 3817 if (code != JNI_OK) { 3818 return code; 3819 } 3820 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3821 if (args_out->is_set()) { 3822 // The VMOptions file inserted some options so switch 'args' 3823 // to the new set of options, and continue processing which 3824 // preserves "last option wins" semantics. 3825 args = args_out->get(); 3826 // The first option from the VMOptionsFile replaces the 3827 // current option. So we back track to process the 3828 // replacement option. 3829 index--; 3830 } 3831 continue; 3832 } 3833 if (match_option(option, "-XX:+PrintVMOptions")) { 3834 PrintVMOptions = true; 3835 continue; 3836 } 3837 if (match_option(option, "-XX:-PrintVMOptions")) { 3838 PrintVMOptions = false; 3839 continue; 3840 } 3841 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3842 IgnoreUnrecognizedVMOptions = true; 3843 continue; 3844 } 3845 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3846 IgnoreUnrecognizedVMOptions = false; 3847 continue; 3848 } 3849 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3850 JVMFlag::printFlags(tty, false); 3851 vm_exit(0); 3852 } 3853 3854 #ifndef PRODUCT 3855 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3856 JVMFlag::printFlags(tty, true); 3857 vm_exit(0); 3858 } 3859 #endif 3860 } 3861 return JNI_OK; 3862 } 3863 3864 static void print_options(const JavaVMInitArgs *args) { 3865 const char* tail; 3866 for (int index = 0; index < args->nOptions; index++) { 3867 const JavaVMOption *option = args->options + index; 3868 if (match_option(option, "-XX:", &tail)) { 3869 logOption(tail); 3870 } 3871 } 3872 } 3873 3874 bool Arguments::handle_deprecated_print_gc_flags() { 3875 if (PrintGC) { 3876 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3877 } 3878 if (PrintGCDetails) { 3879 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3880 } 3881 3882 if (_legacyGCLogging.lastFlag == 2) { 3883 // -Xloggc was used to specify a filename 3884 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3885 3886 LogTarget(Error, logging) target; 3887 LogStream errstream(target); 3888 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, NULL, NULL, &errstream); 3889 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3890 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3891 } 3892 return true; 3893 } 3894 3895 static void apply_debugger_ergo() { 3896 if (ReplayCompiles) { 3897 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3898 } 3899 3900 if (UseDebuggerErgo) { 3901 // Turn on sub-flags 3902 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3903 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3904 } 3905 3906 if (UseDebuggerErgo2) { 3907 // Debugging with limited number of CPUs 3908 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3909 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3910 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3911 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3912 } 3913 } 3914 3915 // Parse entry point called from JNI_CreateJavaVM 3916 3917 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3918 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3919 JVMFlag::check_all_flag_declarations(); 3920 3921 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3922 const char* hotspotrc = ".hotspotrc"; 3923 bool settings_file_specified = false; 3924 bool needs_hotspotrc_warning = false; 3925 ScopedVMInitArgs initial_vm_options_args(""); 3926 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3927 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3928 3929 // Pointers to current working set of containers 3930 JavaVMInitArgs* cur_cmd_args; 3931 JavaVMInitArgs* cur_vm_options_args; 3932 JavaVMInitArgs* cur_java_options_args; 3933 JavaVMInitArgs* cur_java_tool_options_args; 3934 3935 // Containers for modified/expanded options 3936 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3937 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3938 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3939 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3940 3941 3942 jint code = 3943 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3944 if (code != JNI_OK) { 3945 return code; 3946 } 3947 3948 code = parse_java_options_environment_variable(&initial_java_options_args); 3949 if (code != JNI_OK) { 3950 return code; 3951 } 3952 3953 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3954 char *vmoptions = ClassLoader::lookup_vm_options(); 3955 if (vmoptions != NULL) { 3956 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3957 FREE_C_HEAP_ARRAY(char, vmoptions); 3958 if (code != JNI_OK) { 3959 return code; 3960 } 3961 } 3962 3963 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3964 &mod_java_tool_options_args, 3965 &cur_java_tool_options_args); 3966 if (code != JNI_OK) { 3967 return code; 3968 } 3969 3970 code = expand_vm_options_as_needed(initial_cmd_args, 3971 &mod_cmd_args, 3972 &cur_cmd_args); 3973 if (code != JNI_OK) { 3974 return code; 3975 } 3976 3977 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3978 &mod_java_options_args, 3979 &cur_java_options_args); 3980 if (code != JNI_OK) { 3981 return code; 3982 } 3983 3984 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3985 &mod_vm_options_args, 3986 &cur_vm_options_args); 3987 if (code != JNI_OK) { 3988 return code; 3989 } 3990 3991 const char* flags_file = Arguments::get_jvm_flags_file(); 3992 settings_file_specified = (flags_file != NULL); 3993 3994 if (IgnoreUnrecognizedVMOptions) { 3995 cur_cmd_args->ignoreUnrecognized = true; 3996 cur_java_tool_options_args->ignoreUnrecognized = true; 3997 cur_java_options_args->ignoreUnrecognized = true; 3998 } 3999 4000 // Parse specified settings file 4001 if (settings_file_specified) { 4002 if (!process_settings_file(flags_file, true, 4003 cur_cmd_args->ignoreUnrecognized)) { 4004 return JNI_EINVAL; 4005 } 4006 } else { 4007 #ifdef ASSERT 4008 // Parse default .hotspotrc settings file 4009 if (!process_settings_file(".hotspotrc", false, 4010 cur_cmd_args->ignoreUnrecognized)) { 4011 return JNI_EINVAL; 4012 } 4013 #else 4014 struct stat buf; 4015 if (os::stat(hotspotrc, &buf) == 0) { 4016 needs_hotspotrc_warning = true; 4017 } 4018 #endif 4019 } 4020 4021 if (PrintVMOptions) { 4022 print_options(cur_java_tool_options_args); 4023 print_options(cur_cmd_args); 4024 print_options(cur_java_options_args); 4025 } 4026 4027 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4028 jint result = parse_vm_init_args(cur_vm_options_args, 4029 cur_java_tool_options_args, 4030 cur_java_options_args, 4031 cur_cmd_args); 4032 4033 if (result != JNI_OK) { 4034 return result; 4035 } 4036 4037 // Delay warning until here so that we've had a chance to process 4038 // the -XX:-PrintWarnings flag 4039 if (needs_hotspotrc_warning) { 4040 warning("%s file is present but has been ignored. " 4041 "Run with -XX:Flags=%s to load the file.", 4042 hotspotrc, hotspotrc); 4043 } 4044 4045 if (needs_module_property_warning) { 4046 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4047 " names that are reserved for internal use."); 4048 } 4049 4050 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4051 UNSUPPORTED_OPTION(UseLargePages); 4052 #endif 4053 4054 #if defined(AIX) 4055 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 4056 #endif 4057 4058 #ifndef PRODUCT 4059 if (TraceBytecodesAt != 0) { 4060 TraceBytecodes = true; 4061 } 4062 if (CountCompiledCalls) { 4063 if (UseCounterDecay) { 4064 warning("UseCounterDecay disabled because CountCalls is set"); 4065 UseCounterDecay = false; 4066 } 4067 } 4068 #endif // PRODUCT 4069 4070 if (ScavengeRootsInCode == 0) { 4071 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4072 warning("Forcing ScavengeRootsInCode non-zero"); 4073 } 4074 ScavengeRootsInCode = 1; 4075 } 4076 4077 if (!handle_deprecated_print_gc_flags()) { 4078 return JNI_EINVAL; 4079 } 4080 4081 // Set object alignment values. 4082 set_object_alignment(); 4083 4084 #if !INCLUDE_CDS 4085 if (DumpSharedSpaces || RequireSharedSpaces) { 4086 jio_fprintf(defaultStream::error_stream(), 4087 "Shared spaces are not supported in this VM\n"); 4088 return JNI_ERR; 4089 } 4090 if (DumpLoadedClassList != NULL) { 4091 jio_fprintf(defaultStream::error_stream(), 4092 "DumpLoadedClassList is not supported in this VM\n"); 4093 return JNI_ERR; 4094 } 4095 if ((UseSharedSpaces && xshare_auto_cmd_line) || 4096 log_is_enabled(Info, cds)) { 4097 warning("Shared spaces are not supported in this VM"); 4098 UseSharedSpaces = false; 4099 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4100 } 4101 no_shared_spaces("CDS Disabled"); 4102 #endif // INCLUDE_CDS 4103 4104 // Verify NMT arguments 4105 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 4106 if (lvl == NMT_unknown) { 4107 jio_fprintf(defaultStream::error_stream(), 4108 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4109 return JNI_ERR; 4110 } 4111 if (PrintNMTStatistics && lvl == NMT_off) { 4112 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 4113 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 4114 } 4115 4116 if (TraceDependencies && VerifyDependencies) { 4117 if (!FLAG_IS_DEFAULT(TraceDependencies)) { 4118 warning("TraceDependencies results may be inflated by VerifyDependencies"); 4119 } 4120 } 4121 4122 apply_debugger_ergo(); 4123 4124 if (log_is_enabled(Info, arguments)) { 4125 LogStream st(Log(arguments)::info()); 4126 Arguments::print_on(&st); 4127 } 4128 4129 return JNI_OK; 4130 } 4131 4132 jint Arguments::apply_ergo() { 4133 // Set flags based on ergonomics. 4134 jint result = set_ergonomics_flags(); 4135 if (result != JNI_OK) return result; 4136 4137 // Set heap size based on available physical memory 4138 set_heap_size(); 4139 4140 GCConfig::arguments()->initialize(); 4141 4142 set_shared_spaces_flags_and_archive_paths(); 4143 4144 // Initialize Metaspace flags and alignments 4145 Metaspace::ergo_initialize(); 4146 4147 if (!StringDedup::ergo_initialize()) { 4148 return JNI_EINVAL; 4149 } 4150 4151 // Set compiler flags after GC is selected and GC specific 4152 // flags (LoopStripMiningIter) are set. 4153 CompilerConfig::ergo_initialize(); 4154 4155 // Set bytecode rewriting flags 4156 set_bytecode_flags(); 4157 4158 // Set flags if aggressive optimization flags are enabled 4159 jint code = set_aggressive_opts_flags(); 4160 if (code != JNI_OK) { 4161 return code; 4162 } 4163 4164 #ifdef ZERO 4165 // Clear flags not supported on zero. 4166 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4167 4168 if (LogTouchedMethods) { 4169 warning("LogTouchedMethods is not supported for Zero"); 4170 FLAG_SET_DEFAULT(LogTouchedMethods, false); 4171 } 4172 #endif // ZERO 4173 4174 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4175 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4176 DebugNonSafepoints = true; 4177 } 4178 4179 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4180 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4181 } 4182 4183 // Treat the odd case where local verification is enabled but remote 4184 // verification is not as if both were enabled. 4185 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4186 log_info(verification)("Turning on remote verification because local verification is on"); 4187 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4188 } 4189 4190 #ifndef PRODUCT 4191 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4192 if (use_vm_log()) { 4193 LogVMOutput = true; 4194 } 4195 } 4196 #endif // PRODUCT 4197 4198 if (PrintCommandLineFlags) { 4199 JVMFlag::printSetFlags(tty); 4200 } 4201 4202 #ifdef COMPILER2 4203 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 4204 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 4205 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 4206 } 4207 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 4208 4209 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 4210 if (!EnableVectorReboxing) { 4211 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 4212 } else { 4213 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 4214 } 4215 } 4216 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 4217 4218 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 4219 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 4220 } 4221 FLAG_SET_DEFAULT(UseVectorStubs, false); 4222 } 4223 #endif // COMPILER2 4224 4225 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 4226 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 4227 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 4228 } 4229 } 4230 return JNI_OK; 4231 } 4232 4233 jint Arguments::adjust_after_os() { 4234 if (UseNUMA) { 4235 if (UseParallelGC) { 4236 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4237 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4238 } 4239 } 4240 } 4241 return JNI_OK; 4242 } 4243 4244 int Arguments::PropertyList_count(SystemProperty* pl) { 4245 int count = 0; 4246 while(pl != NULL) { 4247 count++; 4248 pl = pl->next(); 4249 } 4250 return count; 4251 } 4252 4253 // Return the number of readable properties. 4254 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4255 int count = 0; 4256 while(pl != NULL) { 4257 if (pl->is_readable()) { 4258 count++; 4259 } 4260 pl = pl->next(); 4261 } 4262 return count; 4263 } 4264 4265 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4266 assert(key != NULL, "just checking"); 4267 SystemProperty* prop; 4268 for (prop = pl; prop != NULL; prop = prop->next()) { 4269 if (strcmp(key, prop->key()) == 0) return prop->value(); 4270 } 4271 return NULL; 4272 } 4273 4274 // Return the value of the requested property provided that it is a readable property. 4275 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4276 assert(key != NULL, "just checking"); 4277 SystemProperty* prop; 4278 // Return the property value if the keys match and the property is not internal or 4279 // it's the special internal property "jdk.boot.class.path.append". 4280 for (prop = pl; prop != NULL; prop = prop->next()) { 4281 if (strcmp(key, prop->key()) == 0) { 4282 if (!prop->internal()) { 4283 return prop->value(); 4284 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4285 return prop->value(); 4286 } else { 4287 // Property is internal and not jdk.boot.class.path.append so return NULL. 4288 return NULL; 4289 } 4290 } 4291 } 4292 return NULL; 4293 } 4294 4295 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4296 int count = 0; 4297 const char* ret_val = NULL; 4298 4299 while(pl != NULL) { 4300 if(count >= index) { 4301 ret_val = pl->key(); 4302 break; 4303 } 4304 count++; 4305 pl = pl->next(); 4306 } 4307 4308 return ret_val; 4309 } 4310 4311 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4312 int count = 0; 4313 char* ret_val = NULL; 4314 4315 while(pl != NULL) { 4316 if(count >= index) { 4317 ret_val = pl->value(); 4318 break; 4319 } 4320 count++; 4321 pl = pl->next(); 4322 } 4323 4324 return ret_val; 4325 } 4326 4327 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4328 SystemProperty* p = *plist; 4329 if (p == NULL) { 4330 *plist = new_p; 4331 } else { 4332 while (p->next() != NULL) { 4333 p = p->next(); 4334 } 4335 p->set_next(new_p); 4336 } 4337 } 4338 4339 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4340 bool writeable, bool internal) { 4341 if (plist == NULL) 4342 return; 4343 4344 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4345 PropertyList_add(plist, new_p); 4346 } 4347 4348 void Arguments::PropertyList_add(SystemProperty *element) { 4349 PropertyList_add(&_system_properties, element); 4350 } 4351 4352 // This add maintains unique property key in the list. 4353 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4354 PropertyAppendable append, PropertyWriteable writeable, 4355 PropertyInternal internal) { 4356 if (plist == NULL) 4357 return; 4358 4359 // If property key exists and is writeable, then update with new value. 4360 // Trying to update a non-writeable property is silently ignored. 4361 SystemProperty* prop; 4362 for (prop = *plist; prop != NULL; prop = prop->next()) { 4363 if (strcmp(k, prop->key()) == 0) { 4364 if (append == AppendProperty) { 4365 prop->append_writeable_value(v); 4366 } else { 4367 prop->set_writeable_value(v); 4368 } 4369 return; 4370 } 4371 } 4372 4373 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4374 } 4375 4376 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4377 // Returns true if all of the source pointed by src has been copied over to 4378 // the destination buffer pointed by buf. Otherwise, returns false. 4379 // Notes: 4380 // 1. If the length (buflen) of the destination buffer excluding the 4381 // NULL terminator character is not long enough for holding the expanded 4382 // pid characters, it also returns false instead of returning the partially 4383 // expanded one. 4384 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4385 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4386 char* buf, size_t buflen) { 4387 const char* p = src; 4388 char* b = buf; 4389 const char* src_end = &src[srclen]; 4390 char* buf_end = &buf[buflen - 1]; 4391 4392 while (p < src_end && b < buf_end) { 4393 if (*p == '%') { 4394 switch (*(++p)) { 4395 case '%': // "%%" ==> "%" 4396 *b++ = *p++; 4397 break; 4398 case 'p': { // "%p" ==> current process id 4399 // buf_end points to the character before the last character so 4400 // that we could write '\0' to the end of the buffer. 4401 size_t buf_sz = buf_end - b + 1; 4402 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4403 4404 // if jio_snprintf fails or the buffer is not long enough to hold 4405 // the expanded pid, returns false. 4406 if (ret < 0 || ret >= (int)buf_sz) { 4407 return false; 4408 } else { 4409 b += ret; 4410 assert(*b == '\0', "fail in copy_expand_pid"); 4411 if (p == src_end && b == buf_end + 1) { 4412 // reach the end of the buffer. 4413 return true; 4414 } 4415 } 4416 p++; 4417 break; 4418 } 4419 default : 4420 *b++ = '%'; 4421 } 4422 } else { 4423 *b++ = *p++; 4424 } 4425 } 4426 *b = '\0'; 4427 return (p == src_end); // return false if not all of the source was copied 4428 }