1 /* 2 * Copyright (c) 1997, 2018, 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 "classfile/classLoader.hpp" 28 #include "classfile/javaAssertions.hpp" 29 #include "classfile/moduleEntry.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "gc/shared/collectorPolicy.hpp" 33 #include "gc/shared/gcArguments.hpp" 34 #include "gc/shared/gcConfig.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logConfiguration.hpp" 37 #include "logging/logStream.hpp" 38 #include "logging/logTag.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/universe.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/arguments_ext.hpp" 45 #include "runtime/flags/jvmFlag.hpp" 46 #include "runtime/flags/jvmFlagConstraintList.hpp" 47 #include "runtime/flags/jvmFlagWriteableList.hpp" 48 #include "runtime/flags/jvmFlagRangeList.hpp" 49 #include "runtime/globals_extension.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/os.inline.hpp" 52 #include "runtime/safepoint.hpp" 53 #include "runtime/safepointMechanism.hpp" 54 #include "runtime/vm_version.hpp" 55 #include "services/management.hpp" 56 #include "services/memTracker.hpp" 57 #include "utilities/align.hpp" 58 #include "utilities/defaultStream.hpp" 59 #include "utilities/macros.hpp" 60 #include "utilities/stringUtils.hpp" 61 #if INCLUDE_JVMCI 62 #include "jvmci/jvmciRuntime.hpp" 63 #endif 64 #if INCLUDE_JFR 65 #include "jfr/jfr.hpp" 66 #endif 67 68 // Note: This is a special bug reporting site for the JVM 69 #ifdef VENDOR_URL_VM_BUG 70 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG 71 #else 72 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 73 #endif 74 #define DEFAULT_JAVA_LAUNCHER "generic" 75 76 char* Arguments::_jvm_flags_file = NULL; 77 char** Arguments::_jvm_flags_array = NULL; 78 int Arguments::_num_jvm_flags = 0; 79 char** Arguments::_jvm_args_array = NULL; 80 int Arguments::_num_jvm_args = 0; 81 char* Arguments::_java_command = NULL; 82 SystemProperty* Arguments::_system_properties = NULL; 83 const char* Arguments::_gc_log_filename = NULL; 84 size_t Arguments::_conservative_max_heap_alignment = 0; 85 size_t Arguments::_min_heap_size = 0; 86 Arguments::Mode Arguments::_mode = _mixed; 87 bool Arguments::_java_compiler = false; 88 bool Arguments::_xdebug_mode = false; 89 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 90 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 91 int Arguments::_sun_java_launcher_pid = -1; 92 bool Arguments::_sun_java_launcher_is_altjvm = false; 93 94 // These parameters are reset in method parse_vm_init_args() 95 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 96 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 97 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 98 bool Arguments::_ClipInlining = ClipInlining; 99 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 100 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 101 102 bool Arguments::_enable_preview = false; 103 104 char* Arguments::SharedArchivePath = NULL; 105 106 AgentLibraryList Arguments::_libraryList; 107 AgentLibraryList Arguments::_agentList; 108 109 abort_hook_t Arguments::_abort_hook = NULL; 110 exit_hook_t Arguments::_exit_hook = NULL; 111 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 112 113 114 SystemProperty *Arguments::_sun_boot_library_path = NULL; 115 SystemProperty *Arguments::_java_library_path = NULL; 116 SystemProperty *Arguments::_java_home = NULL; 117 SystemProperty *Arguments::_java_class_path = NULL; 118 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 119 SystemProperty *Arguments::_vm_info = NULL; 120 121 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 122 PathString *Arguments::_system_boot_class_path = NULL; 123 bool Arguments::_has_jimage = false; 124 125 char* Arguments::_ext_dirs = NULL; 126 127 bool PathString::set_value(const char *value) { 128 if (_value != NULL) { 129 FreeHeap(_value); 130 } 131 _value = AllocateHeap(strlen(value)+1, mtArguments); 132 assert(_value != NULL, "Unable to allocate space for new path value"); 133 if (_value != NULL) { 134 strcpy(_value, value); 135 } else { 136 // not able to allocate 137 return false; 138 } 139 return true; 140 } 141 142 void PathString::append_value(const char *value) { 143 char *sp; 144 size_t len = 0; 145 if (value != NULL) { 146 len = strlen(value); 147 if (_value != NULL) { 148 len += strlen(_value); 149 } 150 sp = AllocateHeap(len+2, mtArguments); 151 assert(sp != NULL, "Unable to allocate space for new append path value"); 152 if (sp != NULL) { 153 if (_value != NULL) { 154 strcpy(sp, _value); 155 strcat(sp, os::path_separator()); 156 strcat(sp, value); 157 FreeHeap(_value); 158 } else { 159 strcpy(sp, value); 160 } 161 _value = sp; 162 } 163 } 164 } 165 166 PathString::PathString(const char* value) { 167 if (value == NULL) { 168 _value = NULL; 169 } else { 170 _value = AllocateHeap(strlen(value)+1, mtArguments); 171 strcpy(_value, value); 172 } 173 } 174 175 PathString::~PathString() { 176 if (_value != NULL) { 177 FreeHeap(_value); 178 _value = NULL; 179 } 180 } 181 182 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 183 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 184 size_t len = strlen(module_name) + 1; 185 _module_name = AllocateHeap(len, mtInternal); 186 strncpy(_module_name, module_name, len); // copy the trailing null 187 _path = new PathString(path); 188 } 189 190 ModulePatchPath::~ModulePatchPath() { 191 if (_module_name != NULL) { 192 FreeHeap(_module_name); 193 _module_name = NULL; 194 } 195 if (_path != NULL) { 196 delete _path; 197 _path = NULL; 198 } 199 } 200 201 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 202 if (key == NULL) { 203 _key = NULL; 204 } else { 205 _key = AllocateHeap(strlen(key)+1, mtArguments); 206 strcpy(_key, key); 207 } 208 _next = NULL; 209 _internal = internal; 210 _writeable = writeable; 211 } 212 213 AgentLibrary::AgentLibrary(const char* name, const char* options, 214 bool is_absolute_path, void* os_lib, 215 bool instrument_lib) { 216 _name = AllocateHeap(strlen(name)+1, mtArguments); 217 strcpy(_name, name); 218 if (options == NULL) { 219 _options = NULL; 220 } else { 221 _options = AllocateHeap(strlen(options)+1, mtArguments); 222 strcpy(_options, options); 223 } 224 _is_absolute_path = is_absolute_path; 225 _os_lib = os_lib; 226 _next = NULL; 227 _state = agent_invalid; 228 _is_static_lib = false; 229 _is_instrument_lib = instrument_lib; 230 } 231 232 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 233 // part of the option string. 234 static bool match_option(const JavaVMOption *option, const char* name, 235 const char** tail) { 236 size_t len = strlen(name); 237 if (strncmp(option->optionString, name, len) == 0) { 238 *tail = option->optionString + len; 239 return true; 240 } else { 241 return false; 242 } 243 } 244 245 // Check if 'option' matches 'name'. No "tail" is allowed. 246 static bool match_option(const JavaVMOption *option, const char* name) { 247 const char* tail = NULL; 248 bool result = match_option(option, name, &tail); 249 if (tail != NULL && *tail == '\0') { 250 return result; 251 } else { 252 return false; 253 } 254 } 255 256 // Return true if any of the strings in null-terminated array 'names' matches. 257 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 258 // the option must match exactly. 259 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 260 bool tail_allowed) { 261 for (/* empty */; *names != NULL; ++names) { 262 if (match_option(option, *names, tail)) { 263 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 264 return true; 265 } 266 } 267 } 268 return false; 269 } 270 271 #if INCLUDE_JFR 272 // return true on failure 273 static bool match_jfr_option(const JavaVMOption** option) { 274 assert((*option)->optionString != NULL, "invariant"); 275 char* tail = NULL; 276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 277 return Jfr::on_start_flight_recording_option(option, tail); 278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 279 return Jfr::on_flight_recorder_option(option, tail); 280 } 281 return false; 282 } 283 #endif 284 285 static void logOption(const char* opt) { 286 if (PrintVMOptions) { 287 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 288 } 289 } 290 291 bool needs_module_property_warning = false; 292 293 #define MODULE_PROPERTY_PREFIX "jdk.module." 294 #define MODULE_PROPERTY_PREFIX_LEN 11 295 #define ADDEXPORTS "addexports" 296 #define ADDEXPORTS_LEN 10 297 #define ADDREADS "addreads" 298 #define ADDREADS_LEN 8 299 #define ADDOPENS "addopens" 300 #define ADDOPENS_LEN 8 301 #define PATCH "patch" 302 #define PATCH_LEN 5 303 #define ADDMODS "addmods" 304 #define ADDMODS_LEN 7 305 #define LIMITMODS "limitmods" 306 #define LIMITMODS_LEN 9 307 #define PATH "path" 308 #define PATH_LEN 4 309 #define UPGRADE_PATH "upgrade.path" 310 #define UPGRADE_PATH_LEN 12 311 312 void Arguments::add_init_library(const char* name, char* options) { 313 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 314 } 315 316 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 317 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 318 } 319 320 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 321 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 322 } 323 324 // Late-binding agents not started via arguments 325 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 326 _agentList.add(agentLib); 327 } 328 329 void Arguments::add_loaded_agent(const char* name, char* options, bool absolute_path, void* os_lib) { 330 _agentList.add(new AgentLibrary(name, options, absolute_path, os_lib)); 331 } 332 333 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 334 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 335 return ((strncmp(option, property, len) == 0) && 336 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 337 } 338 339 // Return true if property starts with "jdk.module." and its ensuing chars match 340 // any of the reserved module properties. 341 // property should be passed without the leading "-D". 342 bool Arguments::is_internal_module_property(const char* property) { 343 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 344 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 345 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 346 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 347 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 348 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 349 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 350 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 351 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 352 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 353 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 354 return true; 355 } 356 } 357 return false; 358 } 359 360 // Process java launcher properties. 361 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 362 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 363 // sun.java.launcher.pid is defined. 364 // Must do this before setting up other system properties, 365 // as some of them may depend on launcher type. 366 for (int index = 0; index < args->nOptions; index++) { 367 const JavaVMOption* option = args->options + index; 368 const char* tail; 369 370 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 371 process_java_launcher_argument(tail, option->extraInfo); 372 continue; 373 } 374 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 375 if (strcmp(tail, "true") == 0) { 376 _sun_java_launcher_is_altjvm = true; 377 } 378 continue; 379 } 380 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 381 _sun_java_launcher_pid = atoi(tail); 382 continue; 383 } 384 } 385 } 386 387 // Initialize system properties key and value. 388 void Arguments::init_system_properties() { 389 390 // Set up _system_boot_class_path which is not a property but 391 // relies heavily on argument processing and the jdk.boot.class.path.append 392 // property. It is used to store the underlying system boot class path. 393 _system_boot_class_path = new PathString(NULL); 394 395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 396 "Java Virtual Machine Specification", false)); 397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 398 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 399 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 400 401 // Initialize the vm.info now, but it will need updating after argument parsing. 402 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 403 404 // Following are JVMTI agent writable properties. 405 // Properties values are set to NULL and they are 406 // os specific they are initialized in os::init_system_properties_values(). 407 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 408 _java_library_path = new SystemProperty("java.library.path", NULL, true); 409 _java_home = new SystemProperty("java.home", NULL, true); 410 _java_class_path = new SystemProperty("java.class.path", "", true); 411 // jdk.boot.class.path.append is a non-writeable, internal property. 412 // It can only be set by either: 413 // - -Xbootclasspath/a: 414 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 415 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 416 417 // Add to System Property list. 418 PropertyList_add(&_system_properties, _sun_boot_library_path); 419 PropertyList_add(&_system_properties, _java_library_path); 420 PropertyList_add(&_system_properties, _java_home); 421 PropertyList_add(&_system_properties, _java_class_path); 422 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 423 PropertyList_add(&_system_properties, _vm_info); 424 425 // Set OS specific system properties values 426 os::init_system_properties_values(); 427 } 428 429 // Update/Initialize System properties after JDK version number is known 430 void Arguments::init_version_specific_system_properties() { 431 enum { bufsz = 16 }; 432 char buffer[bufsz]; 433 const char* spec_vendor = "Oracle Corporation"; 434 uint32_t spec_version = JDK_Version::current().major_version(); 435 436 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 437 438 PropertyList_add(&_system_properties, 439 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 440 PropertyList_add(&_system_properties, 441 new SystemProperty("java.vm.specification.version", buffer, false)); 442 PropertyList_add(&_system_properties, 443 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 444 } 445 446 /* 447 * -XX argument processing: 448 * 449 * -XX arguments are defined in several places, such as: 450 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 451 * -XX arguments are parsed in parse_argument(). 452 * -XX argument bounds checking is done in check_vm_args_consistency(). 453 * 454 * Over time -XX arguments may change. There are mechanisms to handle common cases: 455 * 456 * ALIASED: An option that is simply another name for another option. This is often 457 * part of the process of deprecating a flag, but not all aliases need 458 * to be deprecated. 459 * 460 * Create an alias for an option by adding the old and new option names to the 461 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 462 * 463 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 464 * support may be removed in the future. Both regular and aliased options may be 465 * deprecated. 466 * 467 * Add a deprecation warning for an option (or alias) by adding an entry in the 468 * "special_jvm_flags" table and setting the "deprecated_in" field. 469 * Often an option "deprecated" in one major release will 470 * be made "obsolete" in the next. In this case the entry should also have its 471 * "obsolete_in" field set. 472 * 473 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 474 * on the command line. A warning is printed to let the user know that option might not 475 * be accepted in the future. 476 * 477 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 478 * table and setting the "obsolete_in" field. 479 * 480 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 481 * to the current JDK version. The system will flatly refuse to admit the existence of 482 * the flag. This allows a flag to die automatically over JDK releases. 483 * 484 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 485 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 486 * - Newly obsolete or expired deprecated options should have their global variable 487 * definitions removed (from globals.hpp, etc) and related implementations removed. 488 * 489 * Recommended approach for removing options: 490 * 491 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 492 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 493 * 494 * To remove internal options (e.g. diagnostic, experimental, develop options), use 495 * a 2-step model adding major release numbers to the obsolete and expire columns. 496 * 497 * To change the name of an option, use the alias table as well as a 2-step 498 * model adding major release numbers to the deprecate and expire columns. 499 * Think twice about aliasing commonly used customer options. 500 * 501 * There are times when it is appropriate to leave a future release number as undefined. 502 * 503 * Tests: Aliases should be tested in VMAliasOptions.java. 504 * Deprecated options should be tested in VMDeprecatedOptions.java. 505 */ 506 507 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 508 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 509 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 510 // the command-line as usual, but will issue a warning. 511 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 512 // the command-line, while issuing a warning and ignoring the flag value. 513 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 514 // existence of the flag. 515 // 516 // MANUAL CLEANUP ON JDK VERSION UPDATES: 517 // This table ensures that the handling of options will update automatically when the JDK 518 // version is incremented, but the source code needs to be cleanup up manually: 519 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 520 // variable should be removed, as well as users of the variable. 521 // - As "deprecated" options age into "obsolete" options, move the entry into the 522 // "Obsolete Flags" section of the table. 523 // - All expired options should be removed from the table. 524 static SpecialFlag const special_jvm_flags[] = { 525 // -------------- Deprecated Flags -------------- 526 // --- Non-alias flags - sorted by obsolete_in then expired_in: 527 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 528 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 529 { "AssumeMP", JDK_Version::jdk(10),JDK_Version::undefined(), JDK_Version::undefined() }, 530 { "MonitorInUseLists", JDK_Version::jdk(10),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 { "UseMembar", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 535 { "IgnoreUnverifiableClassesDuringDump", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 536 { "CompilerThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 537 { "VMThreadHintNoPreempt", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 538 { "PrintSafepointStatistics", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 539 { "PrintSafepointStatisticsTimeout", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 540 { "PrintSafepointStatisticsCount",JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 541 { "AggressiveOpts", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 542 { "AllowNonVirtualCalls", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 543 { "UnlinkSymbolsALot", JDK_Version::jdk(11), JDK_Version::jdk(12), JDK_Version::jdk(13) }, 544 545 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 546 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 547 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 548 { "MustCallLoadClassInternal", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 549 { "UnsyncloadClass", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 550 551 // -------------- Obsolete Flags - sorted by expired_in -------------- 552 { "CheckAssertionStatusDirectives",JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 553 { "PrintMallocFree", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 554 { "PrintMalloc", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 555 { "ShowSafepointMsgs", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 556 { "FastTLABRefill", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 557 { "SafepointSpinBeforeYield", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 558 { "CheckEndorsedAndExtDirs", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 559 { "DeferThrSuspendLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 560 { "DeferPollingPageLoopCount", JDK_Version::jdk(10), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 561 { "TraceScavenge", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 562 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 563 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 564 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 565 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 566 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 567 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 568 { "UseUTCFileTimestamp", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 569 { "UseAppCDS", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 570 { "InlineNotify", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 571 { "EnableTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 572 { "UseLockedTracing", JDK_Version::undefined(), JDK_Version::jdk(11), JDK_Version::jdk(12) }, 573 574 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 575 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 576 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 577 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 578 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 579 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 580 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 581 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 582 #endif 583 584 { NULL, JDK_Version(0), JDK_Version(0) } 585 }; 586 587 // Flags that are aliases for other flags. 588 typedef struct { 589 const char* alias_name; 590 const char* real_name; 591 } AliasedFlag; 592 593 static AliasedFlag const aliased_jvm_flags[] = { 594 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 595 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 596 { NULL, NULL} 597 }; 598 599 // NOTE: A compatibility request will be necessary for each alias to be removed. 600 static AliasedLoggingFlag const aliased_logging_flags[] = { 601 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 602 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 603 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 604 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 605 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 606 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 607 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 608 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 609 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 610 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 611 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 612 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 613 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 614 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 615 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 616 }; 617 618 #ifndef PRODUCT 619 // These options are removed in jdk9. Remove this code for jdk10. 620 static AliasedFlag const removed_develop_logging_flags[] = { 621 { "TraceClassInitialization", "-Xlog:class+init" }, 622 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 623 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 624 { "TraceItables", "-Xlog:itables=debug" }, 625 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 626 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 627 { "TraceStartupTime", "-Xlog:startuptime" }, 628 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 629 { "PrintVtables", "-Xlog:vtables=debug" }, 630 { "VerboseVerification", "-Xlog:verification" }, 631 { NULL, NULL } 632 }; 633 #endif //PRODUCT 634 635 // Return true if "v" is less than "other", where "other" may be "undefined". 636 static bool version_less_than(JDK_Version v, JDK_Version other) { 637 assert(!v.is_undefined(), "must be defined"); 638 if (!other.is_undefined() && v.compare(other) >= 0) { 639 return false; 640 } else { 641 return true; 642 } 643 } 644 645 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 646 647 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 648 // Allow extensions to have priority 649 if (lookup_special_flag_ext(flag_name, flag)) { 650 return true; 651 } 652 653 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 654 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 655 flag = special_jvm_flags[i]; 656 return true; 657 } 658 } 659 return false; 660 } 661 662 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 663 assert(version != NULL, "Must provide a version buffer"); 664 SpecialFlag flag; 665 if (lookup_special_flag(flag_name, flag)) { 666 if (!flag.obsolete_in.is_undefined()) { 667 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 668 *version = flag.obsolete_in; 669 return true; 670 } 671 } 672 } 673 return false; 674 } 675 676 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 677 assert(version != NULL, "Must provide a version buffer"); 678 SpecialFlag flag; 679 if (lookup_special_flag(flag_name, flag)) { 680 if (!flag.deprecated_in.is_undefined()) { 681 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 682 version_less_than(JDK_Version::current(), flag.expired_in)) { 683 *version = flag.deprecated_in; 684 return 1; 685 } else { 686 return -1; 687 } 688 } 689 } 690 return 0; 691 } 692 693 #ifndef PRODUCT 694 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 695 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 696 const AliasedFlag& flag = removed_develop_logging_flags[i]; 697 if (strcmp(flag.alias_name, name) == 0) { 698 return flag.real_name; 699 } 700 } 701 return NULL; 702 } 703 #endif // PRODUCT 704 705 const char* Arguments::real_flag_name(const char *flag_name) { 706 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 707 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 708 if (strcmp(flag_status.alias_name, flag_name) == 0) { 709 return flag_status.real_name; 710 } 711 } 712 return flag_name; 713 } 714 715 #ifdef ASSERT 716 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 717 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 718 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 719 return true; 720 } 721 } 722 return false; 723 } 724 725 // Verifies the correctness of the entries in the special_jvm_flags table. 726 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 727 // version being earlier than the deprecation version, then a warning is issued 728 // and verification fails - by returning false. If it is detected that the table 729 // is out of date, with respect to the current version, then a warning is issued 730 // but verification does not fail. This allows the VM to operate when the version 731 // is first updated, without needing to update all the impacted flags at the 732 // same time. 733 static bool verify_special_jvm_flags() { 734 bool success = true; 735 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 736 const SpecialFlag& flag = special_jvm_flags[i]; 737 if (lookup_special_flag(flag.name, i)) { 738 warning("Duplicate special flag declaration \"%s\"", flag.name); 739 success = false; 740 } 741 if (flag.deprecated_in.is_undefined() && 742 flag.obsolete_in.is_undefined()) { 743 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 744 success = false; 745 } 746 747 if (!flag.deprecated_in.is_undefined()) { 748 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 749 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 750 success = false; 751 } 752 753 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 754 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 755 success = false; 756 } 757 } 758 759 if (!flag.obsolete_in.is_undefined()) { 760 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 761 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 762 success = false; 763 } 764 765 // if flag has become obsolete it should not have a "globals" flag defined anymore. 766 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 767 if (JVMFlag::find_flag(flag.name) != NULL) { 768 // Temporarily disable the warning: 8196739 769 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 770 } 771 } 772 } 773 774 if (!flag.expired_in.is_undefined()) { 775 // if flag has become expired it should not have a "globals" flag defined anymore. 776 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 777 if (JVMFlag::find_flag(flag.name) != NULL) { 778 // Temporarily disable the warning: 8196739 779 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 780 } 781 } 782 } 783 784 } 785 return success; 786 } 787 #endif 788 789 // Parses a size specification string. 790 bool Arguments::atojulong(const char *s, julong* result) { 791 julong n = 0; 792 793 // First char must be a digit. Don't allow negative numbers or leading spaces. 794 if (!isdigit(*s)) { 795 return false; 796 } 797 798 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 799 char* remainder; 800 errno = 0; 801 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 802 if (errno != 0) { 803 return false; 804 } 805 806 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 807 if (remainder == s || strlen(remainder) > 1) { 808 return false; 809 } 810 811 switch (*remainder) { 812 case 'T': case 't': 813 *result = n * G * K; 814 // Check for overflow. 815 if (*result/((julong)G * K) != n) return false; 816 return true; 817 case 'G': case 'g': 818 *result = n * G; 819 if (*result/G != n) return false; 820 return true; 821 case 'M': case 'm': 822 *result = n * M; 823 if (*result/M != n) return false; 824 return true; 825 case 'K': case 'k': 826 *result = n * K; 827 if (*result/K != n) return false; 828 return true; 829 case '\0': 830 *result = n; 831 return true; 832 default: 833 return false; 834 } 835 } 836 837 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 838 if (size < min_size) return arg_too_small; 839 if (size > max_size) return arg_too_big; 840 return arg_in_range; 841 } 842 843 // Describe an argument out of range error 844 void Arguments::describe_range_error(ArgsRange errcode) { 845 switch(errcode) { 846 case arg_too_big: 847 jio_fprintf(defaultStream::error_stream(), 848 "The specified size exceeds the maximum " 849 "representable size.\n"); 850 break; 851 case arg_too_small: 852 case arg_unreadable: 853 case arg_in_range: 854 // do nothing for now 855 break; 856 default: 857 ShouldNotReachHere(); 858 } 859 } 860 861 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) { 862 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) { 863 return true; 864 } else { 865 return false; 866 } 867 } 868 869 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) { 870 char* end; 871 errno = 0; 872 double v = strtod(value, &end); 873 if ((errno != 0) || (*end != 0)) { 874 return false; 875 } 876 877 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) { 878 return true; 879 } 880 return false; 881 } 882 883 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) { 884 julong v; 885 int int_v; 886 intx intx_v; 887 bool is_neg = false; 888 JVMFlag* result = JVMFlag::find_flag(name, strlen(name)); 889 890 if (result == NULL) { 891 return false; 892 } 893 894 // Check the sign first since atojulong() parses only unsigned values. 895 if (*value == '-') { 896 if (!result->is_intx() && !result->is_int()) { 897 return false; 898 } 899 value++; 900 is_neg = true; 901 } 902 if (!Arguments::atojulong(value, &v)) { 903 return false; 904 } 905 if (result->is_int()) { 906 int_v = (int) v; 907 if (is_neg) { 908 int_v = -int_v; 909 } 910 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS; 911 } else if (result->is_uint()) { 912 uint uint_v = (uint) v; 913 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS; 914 } else if (result->is_intx()) { 915 intx_v = (intx) v; 916 if (is_neg) { 917 intx_v = -intx_v; 918 } 919 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS; 920 } else if (result->is_uintx()) { 921 uintx uintx_v = (uintx) v; 922 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS; 923 } else if (result->is_uint64_t()) { 924 uint64_t uint64_t_v = (uint64_t) v; 925 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS; 926 } else if (result->is_size_t()) { 927 size_t size_t_v = (size_t) v; 928 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS; 929 } else if (result->is_double()) { 930 double double_v = (double) v; 931 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS; 932 } else { 933 return false; 934 } 935 } 936 937 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) { 938 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false; 939 // Contract: JVMFlag always returns a pointer that needs freeing. 940 FREE_C_HEAP_ARRAY(char, value); 941 return true; 942 } 943 944 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) { 945 const char* old_value = ""; 946 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false; 947 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 948 size_t new_len = strlen(new_value); 949 const char* value; 950 char* free_this_too = NULL; 951 if (old_len == 0) { 952 value = new_value; 953 } else if (new_len == 0) { 954 value = old_value; 955 } else { 956 size_t length = old_len + 1 + new_len + 1; 957 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 958 // each new setting adds another LINE to the switch: 959 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 960 value = buf; 961 free_this_too = buf; 962 } 963 (void) JVMFlag::ccstrAtPut(name, &value, origin); 964 // JVMFlag always returns a pointer that needs freeing. 965 FREE_C_HEAP_ARRAY(char, value); 966 if (free_this_too != NULL) { 967 // JVMFlag made its own copy, so I must delete my own temp. buffer. 968 FREE_C_HEAP_ARRAY(char, free_this_too); 969 } 970 return true; 971 } 972 973 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 974 const char* real_name = real_flag_name(arg); 975 JDK_Version since = JDK_Version(); 976 switch (is_deprecated_flag(arg, &since)) { 977 case -1: 978 return NULL; // obsolete or expired, don't process normally 979 case 0: 980 return real_name; 981 case 1: { 982 if (warn) { 983 char version[256]; 984 since.to_string(version, sizeof(version)); 985 if (real_name != arg) { 986 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 987 arg, version, real_name); 988 } else { 989 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 990 arg, version); 991 } 992 } 993 return real_name; 994 } 995 } 996 ShouldNotReachHere(); 997 return NULL; 998 } 999 1000 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 1001 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 1002 // Set tagset string buffer at max size of 256, large enough for any alias tagset 1003 const int max_tagset_size = 256; 1004 int max_tagset_len = max_tagset_size - 1; 1005 char tagset_buffer[max_tagset_size]; 1006 tagset_buffer[0] = '\0'; 1007 1008 // Write tag-set for aliased logging option, in string list form 1009 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 1010 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 1011 if (i > 0) { 1012 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 1013 } 1014 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 1015 } 1016 if (!alf.exactMatch) { 1017 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 1018 } 1019 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 1020 (on) ? "+" : "-", 1021 name, 1022 tagset_buffer, 1023 (on) ? LogLevel::name(alf.level) : "off"); 1024 } 1025 1026 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 1027 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 1028 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1029 if (strcmp(alf.alias_name, name) == 0) { 1030 log_deprecated_flag(name, on, alf); 1031 return alf; 1032 } 1033 } 1034 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1035 return a; 1036 } 1037 1038 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) { 1039 1040 // range of acceptable characters spelled out for portability reasons 1041 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1042 #define BUFLEN 255 1043 char name[BUFLEN+1]; 1044 char dummy; 1045 const char* real_name; 1046 bool warn_if_deprecated = true; 1047 1048 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1049 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1050 if (alf.alias_name != NULL){ 1051 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1052 return true; 1053 } 1054 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1055 if (real_name == NULL) { 1056 return false; 1057 } 1058 return set_bool_flag(real_name, false, origin); 1059 } 1060 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1061 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1062 if (alf.alias_name != NULL){ 1063 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1064 return true; 1065 } 1066 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1067 if (real_name == NULL) { 1068 return false; 1069 } 1070 return set_bool_flag(real_name, true, origin); 1071 } 1072 1073 char punct; 1074 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1075 const char* value = strchr(arg, '=') + 1; 1076 JVMFlag* flag; 1077 1078 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1079 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1080 if (alf.alias_name != NULL) { 1081 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1082 return true; 1083 } 1084 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1085 if (real_name == NULL) { 1086 return false; 1087 } 1088 flag = JVMFlag::find_flag(real_name); 1089 if (flag != NULL && flag->is_ccstr()) { 1090 if (flag->ccstr_accumulates()) { 1091 return append_to_string_flag(real_name, value, origin); 1092 } else { 1093 if (value[0] == '\0') { 1094 value = NULL; 1095 } 1096 return set_string_flag(real_name, value, origin); 1097 } 1098 } else { 1099 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1100 } 1101 } 1102 1103 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1104 const char* value = strchr(arg, '=') + 1; 1105 // -XX:Foo:=xxx will reset the string flag to the given value. 1106 if (value[0] == '\0') { 1107 value = NULL; 1108 } 1109 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1110 if (real_name == NULL) { 1111 return false; 1112 } 1113 return set_string_flag(real_name, value, origin); 1114 } 1115 1116 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1117 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1118 #define NUMBER_RANGE "[0123456789eE+-]" 1119 char value[BUFLEN + 1]; 1120 char value2[BUFLEN + 1]; 1121 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1122 // Looks like a floating-point number -- try again with more lenient format string 1123 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1124 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1125 if (real_name == NULL) { 1126 return false; 1127 } 1128 return set_fp_numeric_flag(real_name, value, origin); 1129 } 1130 } 1131 1132 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1133 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1134 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1135 if (real_name == NULL) { 1136 return false; 1137 } 1138 return set_numeric_flag(real_name, value, origin); 1139 } 1140 1141 return false; 1142 } 1143 1144 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1145 assert(bldarray != NULL, "illegal argument"); 1146 1147 if (arg == NULL) { 1148 return; 1149 } 1150 1151 int new_count = *count + 1; 1152 1153 // expand the array and add arg to the last element 1154 if (*bldarray == NULL) { 1155 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1156 } else { 1157 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1158 } 1159 (*bldarray)[*count] = os::strdup_check_oom(arg); 1160 *count = new_count; 1161 } 1162 1163 void Arguments::build_jvm_args(const char* arg) { 1164 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1165 } 1166 1167 void Arguments::build_jvm_flags(const char* arg) { 1168 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1169 } 1170 1171 // utility function to return a string that concatenates all 1172 // strings in a given char** array 1173 const char* Arguments::build_resource_string(char** args, int count) { 1174 if (args == NULL || count == 0) { 1175 return NULL; 1176 } 1177 size_t length = 0; 1178 for (int i = 0; i < count; i++) { 1179 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1180 } 1181 char* s = NEW_RESOURCE_ARRAY(char, length); 1182 char* dst = s; 1183 for (int j = 0; j < count; j++) { 1184 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1185 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1186 dst += offset; 1187 length -= offset; 1188 } 1189 return (const char*) s; 1190 } 1191 1192 void Arguments::print_on(outputStream* st) { 1193 st->print_cr("VM Arguments:"); 1194 if (num_jvm_flags() > 0) { 1195 st->print("jvm_flags: "); print_jvm_flags_on(st); 1196 st->cr(); 1197 } 1198 if (num_jvm_args() > 0) { 1199 st->print("jvm_args: "); print_jvm_args_on(st); 1200 st->cr(); 1201 } 1202 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1203 if (_java_class_path != NULL) { 1204 char* path = _java_class_path->value(); 1205 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1206 } 1207 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1208 } 1209 1210 void Arguments::print_summary_on(outputStream* st) { 1211 // Print the command line. Environment variables that are helpful for 1212 // reproducing the problem are written later in the hs_err file. 1213 // flags are from setting file 1214 if (num_jvm_flags() > 0) { 1215 st->print_raw("Settings File: "); 1216 print_jvm_flags_on(st); 1217 st->cr(); 1218 } 1219 // args are the command line and environment variable arguments. 1220 st->print_raw("Command Line: "); 1221 if (num_jvm_args() > 0) { 1222 print_jvm_args_on(st); 1223 } 1224 // this is the classfile and any arguments to the java program 1225 if (java_command() != NULL) { 1226 st->print("%s", java_command()); 1227 } 1228 st->cr(); 1229 } 1230 1231 void Arguments::print_jvm_flags_on(outputStream* st) { 1232 if (_num_jvm_flags > 0) { 1233 for (int i=0; i < _num_jvm_flags; i++) { 1234 st->print("%s ", _jvm_flags_array[i]); 1235 } 1236 } 1237 } 1238 1239 void Arguments::print_jvm_args_on(outputStream* st) { 1240 if (_num_jvm_args > 0) { 1241 for (int i=0; i < _num_jvm_args; i++) { 1242 st->print("%s ", _jvm_args_array[i]); 1243 } 1244 } 1245 } 1246 1247 bool Arguments::process_argument(const char* arg, 1248 jboolean ignore_unrecognized, 1249 JVMFlag::Flags origin) { 1250 JDK_Version since = JDK_Version(); 1251 1252 if (parse_argument(arg, origin)) { 1253 return true; 1254 } 1255 1256 // Determine if the flag has '+', '-', or '=' characters. 1257 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1258 const char* const argname = has_plus_minus ? arg + 1 : arg; 1259 1260 size_t arg_len; 1261 const char* equal_sign = strchr(argname, '='); 1262 if (equal_sign == NULL) { 1263 arg_len = strlen(argname); 1264 } else { 1265 arg_len = equal_sign - argname; 1266 } 1267 1268 // Only make the obsolete check for valid arguments. 1269 if (arg_len <= BUFLEN) { 1270 // Construct a string which consists only of the argument name without '+', '-', or '='. 1271 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1272 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1273 if (is_obsolete_flag(stripped_argname, &since)) { 1274 if (strcmp(stripped_argname, "UseAppCDS") != 0) { 1275 char version[256]; 1276 since.to_string(version, sizeof(version)); 1277 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1278 } else { 1279 warning("Ignoring obsolete option UseAppCDS; AppCDS is automatically enabled"); 1280 } 1281 return true; 1282 } 1283 #ifndef PRODUCT 1284 else { 1285 const char* replacement; 1286 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1287 log_warning(arguments)("%s has been removed. Please use %s instead.", 1288 stripped_argname, 1289 replacement); 1290 return false; 1291 } 1292 } 1293 #endif //PRODUCT 1294 } 1295 1296 // For locked flags, report a custom error message if available. 1297 // Otherwise, report the standard unrecognized VM option. 1298 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true); 1299 if (found_flag != NULL) { 1300 char locked_message_buf[BUFLEN]; 1301 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1302 if (strlen(locked_message_buf) == 0) { 1303 if (found_flag->is_bool() && !has_plus_minus) { 1304 jio_fprintf(defaultStream::error_stream(), 1305 "Missing +/- setting for VM option '%s'\n", argname); 1306 } else if (!found_flag->is_bool() && has_plus_minus) { 1307 jio_fprintf(defaultStream::error_stream(), 1308 "Unexpected +/- setting in VM option '%s'\n", argname); 1309 } else { 1310 jio_fprintf(defaultStream::error_stream(), 1311 "Improperly specified VM option '%s'\n", argname); 1312 } 1313 } else { 1314 #ifdef PRODUCT 1315 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1316 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1317 if (ignore_unrecognized && mismatched) { 1318 return true; 1319 } 1320 #endif 1321 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1322 } 1323 } else { 1324 if (ignore_unrecognized) { 1325 return true; 1326 } 1327 jio_fprintf(defaultStream::error_stream(), 1328 "Unrecognized VM option '%s'\n", argname); 1329 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1330 if (fuzzy_matched != NULL) { 1331 jio_fprintf(defaultStream::error_stream(), 1332 "Did you mean '%s%s%s'? ", 1333 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1334 fuzzy_matched->_name, 1335 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1336 } 1337 } 1338 1339 // allow for commandline "commenting out" options like -XX:#+Verbose 1340 return arg[0] == '#'; 1341 } 1342 1343 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1344 FILE* stream = fopen(file_name, "rb"); 1345 if (stream == NULL) { 1346 if (should_exist) { 1347 jio_fprintf(defaultStream::error_stream(), 1348 "Could not open settings file %s\n", file_name); 1349 return false; 1350 } else { 1351 return true; 1352 } 1353 } 1354 1355 char token[1024]; 1356 int pos = 0; 1357 1358 bool in_white_space = true; 1359 bool in_comment = false; 1360 bool in_quote = false; 1361 char quote_c = 0; 1362 bool result = true; 1363 1364 int c = getc(stream); 1365 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1366 if (in_white_space) { 1367 if (in_comment) { 1368 if (c == '\n') in_comment = false; 1369 } else { 1370 if (c == '#') in_comment = true; 1371 else if (!isspace(c)) { 1372 in_white_space = false; 1373 token[pos++] = c; 1374 } 1375 } 1376 } else { 1377 if (c == '\n' || (!in_quote && isspace(c))) { 1378 // token ends at newline, or at unquoted whitespace 1379 // this allows a way to include spaces in string-valued options 1380 token[pos] = '\0'; 1381 logOption(token); 1382 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1383 build_jvm_flags(token); 1384 pos = 0; 1385 in_white_space = true; 1386 in_quote = false; 1387 } else if (!in_quote && (c == '\'' || c == '"')) { 1388 in_quote = true; 1389 quote_c = c; 1390 } else if (in_quote && (c == quote_c)) { 1391 in_quote = false; 1392 } else { 1393 token[pos++] = c; 1394 } 1395 } 1396 c = getc(stream); 1397 } 1398 if (pos > 0) { 1399 token[pos] = '\0'; 1400 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1401 build_jvm_flags(token); 1402 } 1403 fclose(stream); 1404 return result; 1405 } 1406 1407 //============================================================================================================= 1408 // Parsing of properties (-D) 1409 1410 const char* Arguments::get_property(const char* key) { 1411 return PropertyList_get_value(system_properties(), key); 1412 } 1413 1414 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1415 const char* eq = strchr(prop, '='); 1416 const char* key; 1417 const char* value = ""; 1418 1419 if (eq == NULL) { 1420 // property doesn't have a value, thus use passed string 1421 key = prop; 1422 } else { 1423 // property have a value, thus extract it and save to the 1424 // allocated string 1425 size_t key_len = eq - prop; 1426 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1427 1428 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1429 key = tmp_key; 1430 1431 value = &prop[key_len + 1]; 1432 } 1433 1434 if (strcmp(key, "java.compiler") == 0) { 1435 process_java_compiler_argument(value); 1436 // Record value in Arguments, but let it get passed to Java. 1437 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1438 strcmp(key, "sun.java.launcher.pid") == 0) { 1439 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1440 // private and are processed in process_sun_java_launcher_properties(); 1441 // the sun.java.launcher property is passed on to the java application 1442 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1443 // append is true, writable is true, internal is false 1444 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1445 WriteableProperty, ExternalProperty); 1446 } else { 1447 if (strcmp(key, "sun.java.command") == 0) { 1448 char *old_java_command = _java_command; 1449 _java_command = os::strdup_check_oom(value, mtArguments); 1450 if (old_java_command != NULL) { 1451 os::free(old_java_command); 1452 } 1453 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1454 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1455 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1456 // its value without going through the property list or making a Java call. 1457 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1458 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1459 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1460 os::free((void *)old_java_vendor_url_bug); 1461 } 1462 } 1463 1464 // Create new property and add at the end of the list 1465 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1466 } 1467 1468 if (key != prop) { 1469 // SystemProperty copy passed value, thus free previously allocated 1470 // memory 1471 FreeHeap((void *)key); 1472 } 1473 1474 return true; 1475 } 1476 1477 #if INCLUDE_CDS 1478 const char* unsupported_properties[] = { "jdk.module.limitmods", 1479 "jdk.module.upgrade.path", 1480 "jdk.module.patch.0" }; 1481 const char* unsupported_options[] = { "--limit-modules", 1482 "--upgrade-module-path", 1483 "--patch-module" 1484 }; 1485 void Arguments::check_unsupported_dumping_properties() { 1486 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1487 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1488 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1489 SystemProperty* sp = system_properties(); 1490 while (sp != NULL) { 1491 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1492 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1493 vm_exit_during_initialization( 1494 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1495 } 1496 } 1497 sp = sp->next(); 1498 } 1499 1500 // Check for an exploded module build in use with -Xshare:dump. 1501 if (!has_jimage()) { 1502 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1503 } 1504 } 1505 1506 bool Arguments::check_unsupported_cds_runtime_properties() { 1507 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1508 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 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 } 1514 return true; 1515 } 1516 } 1517 return false; 1518 } 1519 #endif 1520 1521 //=========================================================================================================== 1522 // Setting int/mixed/comp mode flags 1523 1524 void Arguments::set_mode_flags(Mode mode) { 1525 // Set up default values for all flags. 1526 // If you add a flag to any of the branches below, 1527 // add a default value for it here. 1528 set_java_compiler(false); 1529 _mode = mode; 1530 1531 // Ensure Agent_OnLoad has the correct initial values. 1532 // This may not be the final mode; mode may change later in onload phase. 1533 PropertyList_unique_add(&_system_properties, "java.vm.info", 1534 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1535 1536 UseInterpreter = true; 1537 UseCompiler = true; 1538 UseLoopCounter = true; 1539 1540 // Default values may be platform/compiler dependent - 1541 // use the saved values 1542 ClipInlining = Arguments::_ClipInlining; 1543 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1544 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1545 BackgroundCompilation = Arguments::_BackgroundCompilation; 1546 if (TieredCompilation) { 1547 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1548 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1549 } 1550 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1551 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1552 } 1553 } 1554 1555 // Change from defaults based on mode 1556 switch (mode) { 1557 default: 1558 ShouldNotReachHere(); 1559 break; 1560 case _int: 1561 UseCompiler = false; 1562 UseLoopCounter = false; 1563 AlwaysCompileLoopMethods = false; 1564 UseOnStackReplacement = false; 1565 break; 1566 case _mixed: 1567 // same as default 1568 break; 1569 case _comp: 1570 UseInterpreter = false; 1571 BackgroundCompilation = false; 1572 ClipInlining = false; 1573 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1574 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1575 // compile a level 4 (C2) and then continue executing it. 1576 if (TieredCompilation) { 1577 Tier3InvokeNotifyFreqLog = 0; 1578 Tier4InvocationThreshold = 0; 1579 } 1580 break; 1581 } 1582 } 1583 1584 // Conflict: required to use shared spaces (-Xshare:on), but 1585 // incompatible command line options were chosen. 1586 static void no_shared_spaces(const char* message) { 1587 if (RequireSharedSpaces) { 1588 jio_fprintf(defaultStream::error_stream(), 1589 "Class data sharing is inconsistent with other specified options.\n"); 1590 vm_exit_during_initialization("Unable to use shared archive.", message); 1591 } else { 1592 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1593 } 1594 } 1595 1596 void set_object_alignment() { 1597 // Object alignment. 1598 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1599 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1600 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1601 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1602 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1603 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1604 1605 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1606 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1607 1608 // Oop encoding heap max 1609 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1610 1611 if (SurvivorAlignmentInBytes == 0) { 1612 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1613 } 1614 } 1615 1616 size_t Arguments::max_heap_for_compressed_oops() { 1617 // Avoid sign flip. 1618 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1619 // We need to fit both the NULL page and the heap into the memory budget, while 1620 // keeping alignment constraints of the heap. To guarantee the latter, as the 1621 // NULL page is located before the heap, we pad the NULL page to the conservative 1622 // maximum alignment that the GC may ever impose upon the heap. 1623 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1624 _conservative_max_heap_alignment); 1625 1626 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1627 NOT_LP64(ShouldNotReachHere(); return 0); 1628 } 1629 1630 void Arguments::set_use_compressed_oops() { 1631 #ifndef ZERO 1632 #ifdef _LP64 1633 // MaxHeapSize is not set up properly at this point, but 1634 // the only value that can override MaxHeapSize if we are 1635 // to use UseCompressedOops is InitialHeapSize. 1636 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1637 1638 if (max_heap_size <= max_heap_for_compressed_oops()) { 1639 #if !defined(COMPILER1) || defined(TIERED) 1640 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1641 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1642 } 1643 #endif 1644 } else { 1645 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1646 warning("Max heap size too large for Compressed Oops"); 1647 FLAG_SET_DEFAULT(UseCompressedOops, false); 1648 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1649 } 1650 } 1651 #endif // _LP64 1652 #endif // ZERO 1653 } 1654 1655 1656 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1657 // set_use_compressed_oops(). 1658 void Arguments::set_use_compressed_klass_ptrs() { 1659 #ifndef ZERO 1660 #ifdef _LP64 1661 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1662 if (!UseCompressedOops) { 1663 if (UseCompressedClassPointers) { 1664 warning("UseCompressedClassPointers requires UseCompressedOops"); 1665 } 1666 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1667 } else { 1668 // Turn on UseCompressedClassPointers too 1669 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1670 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1671 } 1672 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1673 if (UseCompressedClassPointers) { 1674 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1675 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1676 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1677 } 1678 } 1679 } 1680 #endif // _LP64 1681 #endif // !ZERO 1682 } 1683 1684 void Arguments::set_conservative_max_heap_alignment() { 1685 // The conservative maximum required alignment for the heap is the maximum of 1686 // the alignments imposed by several sources: any requirements from the heap 1687 // itself, the collector policy and the maximum page size we may run the VM 1688 // with. 1689 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1690 _conservative_max_heap_alignment = MAX4(heap_alignment, 1691 (size_t)os::vm_allocation_granularity(), 1692 os::max_page_size(), 1693 CollectorPolicy::compute_heap_alignment()); 1694 } 1695 1696 jint Arguments::set_ergonomics_flags() { 1697 GCConfig::initialize(); 1698 1699 set_conservative_max_heap_alignment(); 1700 1701 #ifndef ZERO 1702 #ifdef _LP64 1703 set_use_compressed_oops(); 1704 1705 // set_use_compressed_klass_ptrs() must be called after calling 1706 // set_use_compressed_oops(). 1707 set_use_compressed_klass_ptrs(); 1708 1709 // Also checks that certain machines are slower with compressed oops 1710 // in vm_version initialization code. 1711 #endif // _LP64 1712 #endif // !ZERO 1713 1714 return JNI_OK; 1715 } 1716 1717 julong Arguments::limit_by_allocatable_memory(julong limit) { 1718 julong max_allocatable; 1719 julong result = limit; 1720 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1721 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1722 } 1723 return result; 1724 } 1725 1726 // Use static initialization to get the default before parsing 1727 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1728 1729 void Arguments::set_heap_size() { 1730 julong phys_mem = 1731 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1732 : (julong)MaxRAM; 1733 1734 // Convert deprecated flags 1735 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1736 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1737 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1738 1739 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1740 !FLAG_IS_DEFAULT(MinRAMFraction)) 1741 MinRAMPercentage = 100.0 / MinRAMFraction; 1742 1743 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1744 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1745 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1746 1747 // If the maximum heap size has not been set with -Xmx, 1748 // then set it as fraction of the size of physical memory, 1749 // respecting the maximum and minimum sizes of the heap. 1750 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1751 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1752 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1753 if (reasonable_min < MaxHeapSize) { 1754 // Small physical memory, so use a minimum fraction of it for the heap 1755 reasonable_max = reasonable_min; 1756 } else { 1757 // Not-small physical memory, so require a heap at least 1758 // as large as MaxHeapSize 1759 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1760 } 1761 1762 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1763 // Limit the heap size to ErgoHeapSizeLimit 1764 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1765 } 1766 if (UseCompressedOops) { 1767 // Limit the heap size to the maximum possible when using compressed oops 1768 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1769 1770 // HeapBaseMinAddress can be greater than default but not less than. 1771 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1772 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1773 // matches compressed oops printing flags 1774 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1775 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1776 DefaultHeapBaseMinAddress, 1777 DefaultHeapBaseMinAddress/G, 1778 HeapBaseMinAddress); 1779 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1780 } 1781 } 1782 1783 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1784 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1785 // but it should be not less than default MaxHeapSize. 1786 max_coop_heap -= HeapBaseMinAddress; 1787 } 1788 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1789 } 1790 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1791 1792 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1793 // An initial heap size was specified on the command line, 1794 // so be sure that the maximum size is consistent. Done 1795 // after call to limit_by_allocatable_memory because that 1796 // method might reduce the allocation size. 1797 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1798 } 1799 1800 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1801 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1802 } 1803 1804 // If the minimum or initial heap_size have not been set or requested to be set 1805 // ergonomically, set them accordingly. 1806 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1807 julong reasonable_minimum = (julong)(OldSize + NewSize); 1808 1809 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1810 1811 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1812 1813 if (InitialHeapSize == 0) { 1814 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1815 1816 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1817 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1818 1819 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1820 1821 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1822 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1823 } 1824 // If the minimum heap size has not been set (via -Xms), 1825 // synchronize with InitialHeapSize to avoid errors with the default value. 1826 if (min_heap_size() == 0) { 1827 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1828 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1829 } 1830 } 1831 } 1832 1833 // This option inspects the machine and attempts to set various 1834 // parameters to be optimal for long-running, memory allocation 1835 // intensive jobs. It is intended for machines with large 1836 // amounts of cpu and memory. 1837 jint Arguments::set_aggressive_heap_flags() { 1838 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1839 // VM, but we may not be able to represent the total physical memory 1840 // available (like having 8gb of memory on a box but using a 32bit VM). 1841 // Thus, we need to make sure we're using a julong for intermediate 1842 // calculations. 1843 julong initHeapSize; 1844 julong total_memory = os::physical_memory(); 1845 1846 if (total_memory < (julong) 256 * M) { 1847 jio_fprintf(defaultStream::error_stream(), 1848 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1849 vm_exit(1); 1850 } 1851 1852 // The heap size is half of available memory, or (at most) 1853 // all of possible memory less 160mb (leaving room for the OS 1854 // when using ISM). This is the maximum; because adaptive sizing 1855 // is turned on below, the actual space used may be smaller. 1856 1857 initHeapSize = MIN2(total_memory / (julong) 2, 1858 total_memory - (julong) 160 * M); 1859 1860 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1861 1862 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1863 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1864 return JNI_EINVAL; 1865 } 1866 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1867 return JNI_EINVAL; 1868 } 1869 // Currently the minimum size and the initial heap sizes are the same. 1870 set_min_heap_size(initHeapSize); 1871 } 1872 if (FLAG_IS_DEFAULT(NewSize)) { 1873 // Make the young generation 3/8ths of the total heap. 1874 if (FLAG_SET_CMDLINE(size_t, NewSize, 1875 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1876 return JNI_EINVAL; 1877 } 1878 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1879 return JNI_EINVAL; 1880 } 1881 } 1882 1883 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1884 FLAG_SET_DEFAULT(UseLargePages, true); 1885 #endif 1886 1887 // Increase some data structure sizes for efficiency 1888 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1889 return JNI_EINVAL; 1890 } 1891 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) { 1892 return JNI_EINVAL; 1893 } 1894 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1895 return JNI_EINVAL; 1896 } 1897 1898 // See the OldPLABSize comment below, but replace 'after promotion' 1899 // with 'after copying'. YoungPLABSize is the size of the survivor 1900 // space per-gc-thread buffers. The default is 4kw. 1901 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1902 return JNI_EINVAL; 1903 } 1904 1905 // OldPLABSize is the size of the buffers in the old gen that 1906 // UseParallelGC uses to promote live data that doesn't fit in the 1907 // survivor spaces. At any given time, there's one for each gc thread. 1908 // The default size is 1kw. These buffers are rarely used, since the 1909 // survivor spaces are usually big enough. For specjbb, however, there 1910 // are occasions when there's lots of live data in the young gen 1911 // and we end up promoting some of it. We don't have a definite 1912 // explanation for why bumping OldPLABSize helps, but the theory 1913 // is that a bigger PLAB results in retaining something like the 1914 // original allocation order after promotion, which improves mutator 1915 // locality. A minor effect may be that larger PLABs reduce the 1916 // number of PLAB allocation events during gc. The value of 8kw 1917 // was arrived at by experimenting with specjbb. 1918 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1919 return JNI_EINVAL; 1920 } 1921 1922 // Enable parallel GC and adaptive generation sizing 1923 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) { 1924 return JNI_EINVAL; 1925 } 1926 1927 // Encourage steady state memory management 1928 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1929 return JNI_EINVAL; 1930 } 1931 1932 // This appears to improve mutator locality 1933 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1934 return JNI_EINVAL; 1935 } 1936 1937 // Get around early Solaris scheduling bug 1938 // (affinity vs other jobs on system) 1939 // but disallow DR and offlining (5008695). 1940 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) { 1941 return JNI_EINVAL; 1942 } 1943 1944 return JNI_OK; 1945 } 1946 1947 // This must be called after ergonomics. 1948 void Arguments::set_bytecode_flags() { 1949 if (!RewriteBytecodes) { 1950 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1951 } 1952 } 1953 1954 // Aggressive optimization flags -XX:+AggressiveOpts 1955 jint Arguments::set_aggressive_opts_flags() { 1956 #ifdef COMPILER2 1957 if (AggressiveUnboxing) { 1958 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1959 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1960 } else if (!EliminateAutoBox) { 1961 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1962 AggressiveUnboxing = false; 1963 } 1964 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1965 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1966 } else if (!DoEscapeAnalysis) { 1967 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1968 AggressiveUnboxing = false; 1969 } 1970 } 1971 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1972 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1973 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1974 } 1975 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1976 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 1977 } 1978 1979 // Feed the cache size setting into the JDK 1980 char buffer[1024]; 1981 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1982 if (!add_property(buffer)) { 1983 return JNI_ENOMEM; 1984 } 1985 } 1986 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 1987 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 1988 } 1989 #endif 1990 1991 if (AggressiveOpts) { 1992 // Sample flag setting code 1993 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 1994 // FLAG_SET_DEFAULT(EliminateZeroing, true); 1995 // } 1996 } 1997 1998 return JNI_OK; 1999 } 2000 2001 //=========================================================================================================== 2002 // Parsing of java.compiler property 2003 2004 void Arguments::process_java_compiler_argument(const char* arg) { 2005 // For backwards compatibility, Djava.compiler=NONE or "" 2006 // causes us to switch to -Xint mode UNLESS -Xdebug 2007 // is also specified. 2008 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2009 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2010 } 2011 } 2012 2013 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2014 _sun_java_launcher = os::strdup_check_oom(launcher); 2015 } 2016 2017 bool Arguments::created_by_java_launcher() { 2018 assert(_sun_java_launcher != NULL, "property must have value"); 2019 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2020 } 2021 2022 bool Arguments::sun_java_launcher_is_altjvm() { 2023 return _sun_java_launcher_is_altjvm; 2024 } 2025 2026 //=========================================================================================================== 2027 // Parsing of main arguments 2028 2029 unsigned int addreads_count = 0; 2030 unsigned int addexports_count = 0; 2031 unsigned int addopens_count = 0; 2032 unsigned int addmods_count = 0; 2033 unsigned int patch_mod_count = 0; 2034 2035 // Check the consistency of vm_init_args 2036 bool Arguments::check_vm_args_consistency() { 2037 // Method for adding checks for flag consistency. 2038 // The intent is to warn the user of all possible conflicts, 2039 // before returning an error. 2040 // Note: Needs platform-dependent factoring. 2041 bool status = true; 2042 2043 if (TLABRefillWasteFraction == 0) { 2044 jio_fprintf(defaultStream::error_stream(), 2045 "TLABRefillWasteFraction should be a denominator, " 2046 "not " SIZE_FORMAT "\n", 2047 TLABRefillWasteFraction); 2048 status = false; 2049 } 2050 2051 if (PrintNMTStatistics) { 2052 #if INCLUDE_NMT 2053 if (MemTracker::tracking_level() == NMT_off) { 2054 #endif // INCLUDE_NMT 2055 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2056 PrintNMTStatistics = false; 2057 #if INCLUDE_NMT 2058 } 2059 #endif 2060 } 2061 2062 status = CompilerConfig::check_args_consistency(status); 2063 #if INCLUDE_JVMCI 2064 if (status && EnableJVMCI) { 2065 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2066 AddProperty, UnwriteableProperty, InternalProperty); 2067 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2068 return false; 2069 } 2070 } 2071 #endif 2072 2073 #ifndef SUPPORT_RESERVED_STACK_AREA 2074 if (StackReservedPages != 0) { 2075 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2076 warning("Reserved Stack Area not supported on this platform"); 2077 } 2078 #endif 2079 2080 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2081 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2082 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2083 } 2084 } 2085 return status; 2086 } 2087 2088 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2089 const char* option_type) { 2090 if (ignore) return false; 2091 2092 const char* spacer = " "; 2093 if (option_type == NULL) { 2094 option_type = ++spacer; // Set both to the empty string. 2095 } 2096 2097 if (os::obsolete_option(option)) { 2098 jio_fprintf(defaultStream::error_stream(), 2099 "Obsolete %s%soption: %s\n", option_type, spacer, 2100 option->optionString); 2101 return false; 2102 } else { 2103 jio_fprintf(defaultStream::error_stream(), 2104 "Unrecognized %s%soption: %s\n", option_type, spacer, 2105 option->optionString); 2106 return true; 2107 } 2108 } 2109 2110 static const char* user_assertion_options[] = { 2111 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2112 }; 2113 2114 static const char* system_assertion_options[] = { 2115 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2116 }; 2117 2118 bool Arguments::parse_uintx(const char* value, 2119 uintx* uintx_arg, 2120 uintx min_size) { 2121 2122 // Check the sign first since atojulong() parses only unsigned values. 2123 bool value_is_positive = !(*value == '-'); 2124 2125 if (value_is_positive) { 2126 julong n; 2127 bool good_return = atojulong(value, &n); 2128 if (good_return) { 2129 bool above_minimum = n >= min_size; 2130 bool value_is_too_large = n > max_uintx; 2131 2132 if (above_minimum && !value_is_too_large) { 2133 *uintx_arg = n; 2134 return true; 2135 } 2136 } 2137 } 2138 return false; 2139 } 2140 2141 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2142 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2143 char* property = AllocateHeap(prop_len, mtArguments); 2144 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2145 if (ret < 0 || ret >= (int)prop_len) { 2146 FreeHeap(property); 2147 return false; 2148 } 2149 bool added = add_property(property, UnwriteableProperty, internal); 2150 FreeHeap(property); 2151 return added; 2152 } 2153 2154 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2155 const unsigned int props_count_limit = 1000; 2156 const int max_digits = 3; 2157 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2158 2159 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2160 if (count < props_count_limit) { 2161 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2162 char* property = AllocateHeap(prop_len, mtArguments); 2163 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2164 if (ret < 0 || ret >= (int)prop_len) { 2165 FreeHeap(property); 2166 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2167 return false; 2168 } 2169 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2170 FreeHeap(property); 2171 return added; 2172 } 2173 2174 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2175 return false; 2176 } 2177 2178 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2179 julong* long_arg, 2180 julong min_size, 2181 julong max_size) { 2182 if (!atojulong(s, long_arg)) return arg_unreadable; 2183 return check_memory_size(*long_arg, min_size, max_size); 2184 } 2185 2186 // Parse JavaVMInitArgs structure 2187 2188 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2189 const JavaVMInitArgs *java_options_args, 2190 const JavaVMInitArgs *cmd_line_args) { 2191 bool patch_mod_javabase = false; 2192 2193 // Save default settings for some mode flags 2194 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2195 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2196 Arguments::_ClipInlining = ClipInlining; 2197 Arguments::_BackgroundCompilation = BackgroundCompilation; 2198 if (TieredCompilation) { 2199 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2200 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2201 } 2202 2203 // Setup flags for mixed which is the default 2204 set_mode_flags(_mixed); 2205 2206 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2207 // variable (if present). 2208 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2209 if (result != JNI_OK) { 2210 return result; 2211 } 2212 2213 // Parse args structure generated from the command line flags. 2214 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE); 2215 if (result != JNI_OK) { 2216 return result; 2217 } 2218 2219 // Parse args structure generated from the _JAVA_OPTIONS environment 2220 // variable (if present) (mimics classic VM) 2221 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2222 if (result != JNI_OK) { 2223 return result; 2224 } 2225 2226 // We need to ensure processor and memory resources have been properly 2227 // configured - which may rely on arguments we just processed - before 2228 // doing the final argument processing. Any argument processing that 2229 // needs to know about processor and memory resources must occur after 2230 // this point. 2231 2232 os::init_container_support(); 2233 2234 // Do final processing now that all arguments have been parsed 2235 result = finalize_vm_init_args(patch_mod_javabase); 2236 if (result != JNI_OK) { 2237 return result; 2238 } 2239 2240 return JNI_OK; 2241 } 2242 2243 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2244 // represents a valid JDWP agent. is_path==true denotes that we 2245 // are dealing with -agentpath (case where name is a path), otherwise with 2246 // -agentlib 2247 bool valid_jdwp_agent(char *name, bool is_path) { 2248 char *_name; 2249 const char *_jdwp = "jdwp"; 2250 size_t _len_jdwp, _len_prefix; 2251 2252 if (is_path) { 2253 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2254 return false; 2255 } 2256 2257 _name++; // skip past last path separator 2258 _len_prefix = strlen(JNI_LIB_PREFIX); 2259 2260 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2261 return false; 2262 } 2263 2264 _name += _len_prefix; 2265 _len_jdwp = strlen(_jdwp); 2266 2267 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2268 _name += _len_jdwp; 2269 } 2270 else { 2271 return false; 2272 } 2273 2274 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2275 return false; 2276 } 2277 2278 return true; 2279 } 2280 2281 if (strcmp(name, _jdwp) == 0) { 2282 return true; 2283 } 2284 2285 return false; 2286 } 2287 2288 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2289 // --patch-module=<module>=<file>(<pathsep><file>)* 2290 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2291 // Find the equal sign between the module name and the path specification 2292 const char* module_equal = strchr(patch_mod_tail, '='); 2293 if (module_equal == NULL) { 2294 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2295 return JNI_ERR; 2296 } else { 2297 // Pick out the module name 2298 size_t module_len = module_equal - patch_mod_tail; 2299 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2300 if (module_name != NULL) { 2301 memcpy(module_name, patch_mod_tail, module_len); 2302 *(module_name + module_len) = '\0'; 2303 // The path piece begins one past the module_equal sign 2304 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2305 FREE_C_HEAP_ARRAY(char, module_name); 2306 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2307 return JNI_ENOMEM; 2308 } 2309 } else { 2310 return JNI_ENOMEM; 2311 } 2312 } 2313 return JNI_OK; 2314 } 2315 2316 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2317 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2318 // The min and max sizes match the values in globals.hpp, but scaled 2319 // with K. The values have been chosen so that alignment with page 2320 // size doesn't change the max value, which makes the conversions 2321 // back and forth between Xss value and ThreadStackSize value easier. 2322 // The values have also been chosen to fit inside a 32-bit signed type. 2323 const julong min_ThreadStackSize = 0; 2324 const julong max_ThreadStackSize = 1 * M; 2325 2326 const julong min_size = min_ThreadStackSize * K; 2327 const julong max_size = max_ThreadStackSize * K; 2328 2329 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2330 2331 julong size = 0; 2332 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2333 if (errcode != arg_in_range) { 2334 bool silent = (option == NULL); // Allow testing to silence error messages 2335 if (!silent) { 2336 jio_fprintf(defaultStream::error_stream(), 2337 "Invalid thread stack size: %s\n", option->optionString); 2338 describe_range_error(errcode); 2339 } 2340 return JNI_EINVAL; 2341 } 2342 2343 // Internally track ThreadStackSize in units of 1024 bytes. 2344 const julong size_aligned = align_up(size, K); 2345 assert(size <= size_aligned, 2346 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2347 size, size_aligned); 2348 2349 const julong size_in_K = size_aligned / K; 2350 assert(size_in_K < (julong)max_intx, 2351 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2352 size_in_K); 2353 2354 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2355 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2356 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2357 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2358 max_expanded, size_in_K); 2359 2360 *out_ThreadStackSize = (intx)size_in_K; 2361 2362 return JNI_OK; 2363 } 2364 2365 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) { 2366 // For match_option to return remaining or value part of option string 2367 const char* tail; 2368 2369 // iterate over arguments 2370 for (int index = 0; index < args->nOptions; index++) { 2371 bool is_absolute_path = false; // for -agentpath vs -agentlib 2372 2373 const JavaVMOption* option = args->options + index; 2374 2375 if (!match_option(option, "-Djava.class.path", &tail) && 2376 !match_option(option, "-Dsun.java.command", &tail) && 2377 !match_option(option, "-Dsun.java.launcher", &tail)) { 2378 2379 // add all jvm options to the jvm_args string. This string 2380 // is used later to set the java.vm.args PerfData string constant. 2381 // the -Djava.class.path and the -Dsun.java.command options are 2382 // omitted from jvm_args string as each have their own PerfData 2383 // string constant object. 2384 build_jvm_args(option->optionString); 2385 } 2386 2387 // -verbose:[class/module/gc/jni] 2388 if (match_option(option, "-verbose", &tail)) { 2389 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2390 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2391 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2392 } else if (!strcmp(tail, ":module")) { 2393 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2394 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2395 } else if (!strcmp(tail, ":gc")) { 2396 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2397 } else if (!strcmp(tail, ":jni")) { 2398 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) { 2399 return JNI_EINVAL; 2400 } 2401 } 2402 // -da / -ea / -disableassertions / -enableassertions 2403 // These accept an optional class/package name separated by a colon, e.g., 2404 // -da:java.lang.Thread. 2405 } else if (match_option(option, user_assertion_options, &tail, true)) { 2406 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2407 if (*tail == '\0') { 2408 JavaAssertions::setUserClassDefault(enable); 2409 } else { 2410 assert(*tail == ':', "bogus match by match_option()"); 2411 JavaAssertions::addOption(tail + 1, enable); 2412 } 2413 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2414 } else if (match_option(option, system_assertion_options, &tail, false)) { 2415 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2416 JavaAssertions::setSystemClassDefault(enable); 2417 // -bootclasspath: 2418 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2419 jio_fprintf(defaultStream::output_stream(), 2420 "-Xbootclasspath is no longer a supported option.\n"); 2421 return JNI_EINVAL; 2422 // -bootclasspath/a: 2423 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2424 Arguments::append_sysclasspath(tail); 2425 // -bootclasspath/p: 2426 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2427 jio_fprintf(defaultStream::output_stream(), 2428 "-Xbootclasspath/p is no longer a supported option.\n"); 2429 return JNI_EINVAL; 2430 // -Xrun 2431 } else if (match_option(option, "-Xrun", &tail)) { 2432 if (tail != NULL) { 2433 const char* pos = strchr(tail, ':'); 2434 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2435 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2436 jio_snprintf(name, len + 1, "%s", tail); 2437 2438 char *options = NULL; 2439 if(pos != NULL) { 2440 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2441 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2442 } 2443 #if !INCLUDE_JVMTI 2444 if (strcmp(name, "jdwp") == 0) { 2445 jio_fprintf(defaultStream::error_stream(), 2446 "Debugging agents are not supported in this VM\n"); 2447 return JNI_ERR; 2448 } 2449 #endif // !INCLUDE_JVMTI 2450 add_init_library(name, options); 2451 } 2452 } else if (match_option(option, "--add-reads=", &tail)) { 2453 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2454 return JNI_ENOMEM; 2455 } 2456 } else if (match_option(option, "--add-exports=", &tail)) { 2457 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2458 return JNI_ENOMEM; 2459 } 2460 } else if (match_option(option, "--add-opens=", &tail)) { 2461 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2462 return JNI_ENOMEM; 2463 } 2464 } else if (match_option(option, "--add-modules=", &tail)) { 2465 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2466 return JNI_ENOMEM; 2467 } 2468 } else if (match_option(option, "--limit-modules=", &tail)) { 2469 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2470 return JNI_ENOMEM; 2471 } 2472 } else if (match_option(option, "--module-path=", &tail)) { 2473 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2474 return JNI_ENOMEM; 2475 } 2476 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2477 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2478 return JNI_ENOMEM; 2479 } 2480 } else if (match_option(option, "--patch-module=", &tail)) { 2481 // --patch-module=<module>=<file>(<pathsep><file>)* 2482 int res = process_patch_mod_option(tail, patch_mod_javabase); 2483 if (res != JNI_OK) { 2484 return res; 2485 } 2486 } else if (match_option(option, "--illegal-access=", &tail)) { 2487 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2488 return JNI_ENOMEM; 2489 } 2490 // -agentlib and -agentpath 2491 } else if (match_option(option, "-agentlib:", &tail) || 2492 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2493 if(tail != NULL) { 2494 const char* pos = strchr(tail, '='); 2495 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2496 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2497 name[len] = '\0'; 2498 2499 char *options = NULL; 2500 if(pos != NULL) { 2501 options = os::strdup_check_oom(pos + 1, mtArguments); 2502 } 2503 #if !INCLUDE_JVMTI 2504 if (valid_jdwp_agent(name, is_absolute_path)) { 2505 jio_fprintf(defaultStream::error_stream(), 2506 "Debugging agents are not supported in this VM\n"); 2507 return JNI_ERR; 2508 } 2509 #endif // !INCLUDE_JVMTI 2510 add_init_agent(name, options, is_absolute_path); 2511 } 2512 // -javaagent 2513 } else if (match_option(option, "-javaagent:", &tail)) { 2514 #if !INCLUDE_JVMTI 2515 jio_fprintf(defaultStream::error_stream(), 2516 "Instrumentation agents are not supported in this VM\n"); 2517 return JNI_ERR; 2518 #else 2519 if (tail != NULL) { 2520 size_t length = strlen(tail) + 1; 2521 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2522 jio_snprintf(options, length, "%s", tail); 2523 add_instrument_agent("instrument", options, false); 2524 // java agents need module java.instrument 2525 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2526 return JNI_ENOMEM; 2527 } 2528 } 2529 #endif // !INCLUDE_JVMTI 2530 // --enable_preview 2531 } else if (match_option(option, "--enable-preview")) { 2532 set_enable_preview(); 2533 // -Xnoclassgc 2534 } else if (match_option(option, "-Xnoclassgc")) { 2535 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) { 2536 return JNI_EINVAL; 2537 } 2538 // -Xconcgc 2539 } else if (match_option(option, "-Xconcgc")) { 2540 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) { 2541 return JNI_EINVAL; 2542 } 2543 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2544 // -Xnoconcgc 2545 } else if (match_option(option, "-Xnoconcgc")) { 2546 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) { 2547 return JNI_EINVAL; 2548 } 2549 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2550 // -Xbatch 2551 } else if (match_option(option, "-Xbatch")) { 2552 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2553 return JNI_EINVAL; 2554 } 2555 // -Xmn for compatibility with other JVM vendors 2556 } else if (match_option(option, "-Xmn", &tail)) { 2557 julong long_initial_young_size = 0; 2558 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2559 if (errcode != arg_in_range) { 2560 jio_fprintf(defaultStream::error_stream(), 2561 "Invalid initial young generation size: %s\n", option->optionString); 2562 describe_range_error(errcode); 2563 return JNI_EINVAL; 2564 } 2565 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2566 return JNI_EINVAL; 2567 } 2568 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2569 return JNI_EINVAL; 2570 } 2571 // -Xms 2572 } else if (match_option(option, "-Xms", &tail)) { 2573 julong long_initial_heap_size = 0; 2574 // an initial heap size of 0 means automatically determine 2575 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2576 if (errcode != arg_in_range) { 2577 jio_fprintf(defaultStream::error_stream(), 2578 "Invalid initial heap size: %s\n", option->optionString); 2579 describe_range_error(errcode); 2580 return JNI_EINVAL; 2581 } 2582 set_min_heap_size((size_t)long_initial_heap_size); 2583 // Currently the minimum size and the initial heap sizes are the same. 2584 // Can be overridden with -XX:InitialHeapSize. 2585 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) { 2586 return JNI_EINVAL; 2587 } 2588 // -Xmx 2589 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2590 julong long_max_heap_size = 0; 2591 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2592 if (errcode != arg_in_range) { 2593 jio_fprintf(defaultStream::error_stream(), 2594 "Invalid maximum heap size: %s\n", option->optionString); 2595 describe_range_error(errcode); 2596 return JNI_EINVAL; 2597 } 2598 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2599 return JNI_EINVAL; 2600 } 2601 // Xmaxf 2602 } else if (match_option(option, "-Xmaxf", &tail)) { 2603 char* err; 2604 int maxf = (int)(strtod(tail, &err) * 100); 2605 if (*err != '\0' || *tail == '\0') { 2606 jio_fprintf(defaultStream::error_stream(), 2607 "Bad max heap free percentage size: %s\n", 2608 option->optionString); 2609 return JNI_EINVAL; 2610 } else { 2611 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2612 return JNI_EINVAL; 2613 } 2614 } 2615 // Xminf 2616 } else if (match_option(option, "-Xminf", &tail)) { 2617 char* err; 2618 int minf = (int)(strtod(tail, &err) * 100); 2619 if (*err != '\0' || *tail == '\0') { 2620 jio_fprintf(defaultStream::error_stream(), 2621 "Bad min heap free percentage size: %s\n", 2622 option->optionString); 2623 return JNI_EINVAL; 2624 } else { 2625 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2626 return JNI_EINVAL; 2627 } 2628 } 2629 // -Xss 2630 } else if (match_option(option, "-Xss", &tail)) { 2631 intx value = 0; 2632 jint err = parse_xss(option, tail, &value); 2633 if (err != JNI_OK) { 2634 return err; 2635 } 2636 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) { 2637 return JNI_EINVAL; 2638 } 2639 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2640 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2641 julong long_ReservedCodeCacheSize = 0; 2642 2643 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2644 if (errcode != arg_in_range) { 2645 jio_fprintf(defaultStream::error_stream(), 2646 "Invalid maximum code cache size: %s.\n", option->optionString); 2647 return JNI_EINVAL; 2648 } 2649 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2650 return JNI_EINVAL; 2651 } 2652 // -green 2653 } else if (match_option(option, "-green")) { 2654 jio_fprintf(defaultStream::error_stream(), 2655 "Green threads support not available\n"); 2656 return JNI_EINVAL; 2657 // -native 2658 } else if (match_option(option, "-native")) { 2659 // HotSpot always uses native threads, ignore silently for compatibility 2660 // -Xrs 2661 } else if (match_option(option, "-Xrs")) { 2662 // Classic/EVM option, new functionality 2663 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2664 return JNI_EINVAL; 2665 } 2666 // -Xprof 2667 } else if (match_option(option, "-Xprof")) { 2668 char version[256]; 2669 // Obsolete in JDK 10 2670 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2671 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2672 // -Xconcurrentio 2673 } else if (match_option(option, "-Xconcurrentio")) { 2674 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != JVMFlag::SUCCESS) { 2675 return JNI_EINVAL; 2676 } 2677 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2678 return JNI_EINVAL; 2679 } 2680 SafepointSynchronize::set_defer_thr_suspend_loop_count(); 2681 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != JVMFlag::SUCCESS) { 2682 return JNI_EINVAL; 2683 } 2684 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != JVMFlag::SUCCESS) { // 20Kb per thread added to new generation 2685 return JNI_EINVAL; 2686 } 2687 2688 // -Xinternalversion 2689 } else if (match_option(option, "-Xinternalversion")) { 2690 jio_fprintf(defaultStream::output_stream(), "%s\n", 2691 VM_Version::internal_vm_info_string()); 2692 vm_exit(0); 2693 #ifndef PRODUCT 2694 // -Xprintflags 2695 } else if (match_option(option, "-Xprintflags")) { 2696 JVMFlag::printFlags(tty, false); 2697 vm_exit(0); 2698 #endif 2699 // -D 2700 } else if (match_option(option, "-D", &tail)) { 2701 const char* value; 2702 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2703 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2704 // abort if -Djava.endorsed.dirs is set 2705 jio_fprintf(defaultStream::output_stream(), 2706 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2707 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2708 return JNI_EINVAL; 2709 } 2710 if (match_option(option, "-Djava.ext.dirs=", &value) && 2711 *value != '\0' && strcmp(value, "\"\"") != 0) { 2712 // abort if -Djava.ext.dirs is set 2713 jio_fprintf(defaultStream::output_stream(), 2714 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2715 return JNI_EINVAL; 2716 } 2717 // Check for module related properties. They must be set using the modules 2718 // options. For example: use "--add-modules=java.sql", not 2719 // "-Djdk.module.addmods=java.sql" 2720 if (is_internal_module_property(option->optionString + 2)) { 2721 needs_module_property_warning = true; 2722 continue; 2723 } 2724 2725 if (!add_property(tail)) { 2726 return JNI_ENOMEM; 2727 } 2728 // Out of the box management support 2729 if (match_option(option, "-Dcom.sun.management", &tail)) { 2730 #if INCLUDE_MANAGEMENT 2731 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) { 2732 return JNI_EINVAL; 2733 } 2734 // management agent in module jdk.management.agent 2735 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2736 return JNI_ENOMEM; 2737 } 2738 #else 2739 jio_fprintf(defaultStream::output_stream(), 2740 "-Dcom.sun.management is not supported in this VM.\n"); 2741 return JNI_ERR; 2742 #endif 2743 } 2744 // -Xint 2745 } else if (match_option(option, "-Xint")) { 2746 set_mode_flags(_int); 2747 // -Xmixed 2748 } else if (match_option(option, "-Xmixed")) { 2749 set_mode_flags(_mixed); 2750 // -Xcomp 2751 } else if (match_option(option, "-Xcomp")) { 2752 // for testing the compiler; turn off all flags that inhibit compilation 2753 set_mode_flags(_comp); 2754 // -Xshare:dump 2755 } else if (match_option(option, "-Xshare:dump")) { 2756 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) { 2757 return JNI_EINVAL; 2758 } 2759 set_mode_flags(_int); // Prevent compilation, which creates objects 2760 // -Xshare:on 2761 } else if (match_option(option, "-Xshare:on")) { 2762 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2763 return JNI_EINVAL; 2764 } 2765 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2766 return JNI_EINVAL; 2767 } 2768 // -Xshare:auto 2769 } else if (match_option(option, "-Xshare:auto")) { 2770 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2771 return JNI_EINVAL; 2772 } 2773 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2774 return JNI_EINVAL; 2775 } 2776 // -Xshare:off 2777 } else if (match_option(option, "-Xshare:off")) { 2778 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) { 2779 return JNI_EINVAL; 2780 } 2781 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2782 return JNI_EINVAL; 2783 } 2784 // -Xverify 2785 } else if (match_option(option, "-Xverify", &tail)) { 2786 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2787 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2788 return JNI_EINVAL; 2789 } 2790 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2791 return JNI_EINVAL; 2792 } 2793 } else if (strcmp(tail, ":remote") == 0) { 2794 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2795 return JNI_EINVAL; 2796 } 2797 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2798 return JNI_EINVAL; 2799 } 2800 } else if (strcmp(tail, ":none") == 0) { 2801 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2802 return JNI_EINVAL; 2803 } 2804 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2805 return JNI_EINVAL; 2806 } 2807 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2808 return JNI_EINVAL; 2809 } 2810 // -Xdebug 2811 } else if (match_option(option, "-Xdebug")) { 2812 // note this flag has been used, then ignore 2813 set_xdebug_mode(true); 2814 // -Xnoagent 2815 } else if (match_option(option, "-Xnoagent")) { 2816 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2817 } else if (match_option(option, "-Xloggc:", &tail)) { 2818 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2819 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2820 _gc_log_filename = 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 (*tail == '\0') { 2831 ret = LogConfiguration::parse_command_line_arguments(); 2832 assert(ret, "-Xlog without arguments should never fail to parse"); 2833 } else if (*tail == ':') { 2834 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2835 } 2836 if (ret == false) { 2837 jio_fprintf(defaultStream::error_stream(), 2838 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2839 tail); 2840 return JNI_EINVAL; 2841 } 2842 // JNI hooks 2843 } else if (match_option(option, "-Xcheck", &tail)) { 2844 if (!strcmp(tail, ":jni")) { 2845 #if !INCLUDE_JNI_CHECK 2846 warning("JNI CHECKING is not supported in this VM"); 2847 #else 2848 CheckJNICalls = true; 2849 #endif // INCLUDE_JNI_CHECK 2850 } else if (is_bad_option(option, args->ignoreUnrecognized, 2851 "check")) { 2852 return JNI_EINVAL; 2853 } 2854 } else if (match_option(option, "vfprintf")) { 2855 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2856 } else if (match_option(option, "exit")) { 2857 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2858 } else if (match_option(option, "abort")) { 2859 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2860 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2861 // and the last option wins. 2862 } else if (match_option(option, "-XX:+NeverTenure")) { 2863 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) { 2864 return JNI_EINVAL; 2865 } 2866 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) { 2867 return JNI_EINVAL; 2868 } 2869 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) { 2870 return JNI_EINVAL; 2871 } 2872 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2873 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) { 2874 return JNI_EINVAL; 2875 } 2876 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) { 2877 return JNI_EINVAL; 2878 } 2879 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2880 return JNI_EINVAL; 2881 } 2882 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2883 uintx max_tenuring_thresh = 0; 2884 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2885 jio_fprintf(defaultStream::error_stream(), 2886 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2887 return JNI_EINVAL; 2888 } 2889 2890 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2891 return JNI_EINVAL; 2892 } 2893 2894 if (MaxTenuringThreshold == 0) { 2895 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) { 2896 return JNI_EINVAL; 2897 } 2898 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) { 2899 return JNI_EINVAL; 2900 } 2901 } else { 2902 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) { 2903 return JNI_EINVAL; 2904 } 2905 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) { 2906 return JNI_EINVAL; 2907 } 2908 } 2909 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2910 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2911 return JNI_EINVAL; 2912 } 2913 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2914 return JNI_EINVAL; 2915 } 2916 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2917 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2918 return JNI_EINVAL; 2919 } 2920 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2921 return JNI_EINVAL; 2922 } 2923 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 2924 #if defined(DTRACE_ENABLED) 2925 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 2926 return JNI_EINVAL; 2927 } 2928 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 2929 return JNI_EINVAL; 2930 } 2931 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 2932 return JNI_EINVAL; 2933 } 2934 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 2935 return JNI_EINVAL; 2936 } 2937 #else // defined(DTRACE_ENABLED) 2938 jio_fprintf(defaultStream::error_stream(), 2939 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2940 return JNI_EINVAL; 2941 #endif // defined(DTRACE_ENABLED) 2942 #ifdef ASSERT 2943 } else if (match_option(option, "-XX:+FullGCALot")) { 2944 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) { 2945 return JNI_EINVAL; 2946 } 2947 // disable scavenge before parallel mark-compact 2948 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2949 return JNI_EINVAL; 2950 } 2951 #endif 2952 #if !INCLUDE_MANAGEMENT 2953 } else if (match_option(option, "-XX:+ManagementServer")) { 2954 jio_fprintf(defaultStream::error_stream(), 2955 "ManagementServer is not supported in this VM.\n"); 2956 return JNI_ERR; 2957 #endif // INCLUDE_MANAGEMENT 2958 #if INCLUDE_JFR 2959 } else if (match_jfr_option(&option)) { 2960 return JNI_EINVAL; 2961 #endif 2962 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2963 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2964 // already been handled 2965 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2966 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2967 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2968 return JNI_EINVAL; 2969 } 2970 } 2971 // Unknown option 2972 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2973 return JNI_ERR; 2974 } 2975 } 2976 2977 // PrintSharedArchiveAndExit will turn on 2978 // -Xshare:on 2979 // -Xlog:class+path=info 2980 if (PrintSharedArchiveAndExit) { 2981 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2982 return JNI_EINVAL; 2983 } 2984 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2985 return JNI_EINVAL; 2986 } 2987 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2988 } 2989 2990 // Change the default value for flags which have different default values 2991 // when working with older JDKs. 2992 #ifdef LINUX 2993 if (JDK_Version::current().compare_major(6) <= 0 && 2994 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2995 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2996 } 2997 #endif // LINUX 2998 fix_appclasspath(); 2999 return JNI_OK; 3000 } 3001 3002 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3003 // For java.base check for duplicate --patch-module options being specified on the command line. 3004 // This check is only required for java.base, all other duplicate module specifications 3005 // will be checked during module system initialization. The module system initialization 3006 // will throw an ExceptionInInitializerError if this situation occurs. 3007 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3008 if (*patch_mod_javabase) { 3009 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3010 } else { 3011 *patch_mod_javabase = true; 3012 } 3013 } 3014 3015 // Create GrowableArray lazily, only if --patch-module has been specified 3016 if (_patch_mod_prefix == NULL) { 3017 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3018 } 3019 3020 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3021 } 3022 3023 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3024 // 3025 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3026 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3027 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3028 // path is treated as the current directory. 3029 // 3030 // This causes problems with CDS, which requires that all directories specified in the classpath 3031 // must be empty. In most cases, applications do NOT want to load classes from the current 3032 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3033 // scripts compatible with CDS. 3034 void Arguments::fix_appclasspath() { 3035 if (IgnoreEmptyClassPaths) { 3036 const char separator = *os::path_separator(); 3037 const char* src = _java_class_path->value(); 3038 3039 // skip over all the leading empty paths 3040 while (*src == separator) { 3041 src ++; 3042 } 3043 3044 char* copy = os::strdup_check_oom(src, mtArguments); 3045 3046 // trim all trailing empty paths 3047 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3048 *tail = '\0'; 3049 } 3050 3051 char from[3] = {separator, separator, '\0'}; 3052 char to [2] = {separator, '\0'}; 3053 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3054 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3055 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3056 } 3057 3058 _java_class_path->set_writeable_value(copy); 3059 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3060 } 3061 } 3062 3063 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3064 // check if the default lib/endorsed directory exists; if so, error 3065 char path[JVM_MAXPATHLEN]; 3066 const char* fileSep = os::file_separator(); 3067 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3068 3069 DIR* dir = os::opendir(path); 3070 if (dir != NULL) { 3071 jio_fprintf(defaultStream::output_stream(), 3072 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3073 "in modular form will be supported via the concept of upgradeable modules.\n"); 3074 os::closedir(dir); 3075 return JNI_ERR; 3076 } 3077 3078 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3079 dir = os::opendir(path); 3080 if (dir != NULL) { 3081 jio_fprintf(defaultStream::output_stream(), 3082 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3083 "Use -classpath instead.\n."); 3084 os::closedir(dir); 3085 return JNI_ERR; 3086 } 3087 3088 // This must be done after all arguments have been processed 3089 // and the container support has been initialized since AggressiveHeap 3090 // relies on the amount of total memory available. 3091 if (AggressiveHeap) { 3092 jint result = set_aggressive_heap_flags(); 3093 if (result != JNI_OK) { 3094 return result; 3095 } 3096 } 3097 3098 // This must be done after all arguments have been processed. 3099 // java_compiler() true means set to "NONE" or empty. 3100 if (java_compiler() && !xdebug_mode()) { 3101 // For backwards compatibility, we switch to interpreted mode if 3102 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3103 // not specified. 3104 set_mode_flags(_int); 3105 } 3106 3107 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3108 // but like -Xint, leave compilation thresholds unaffected. 3109 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3110 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3111 set_mode_flags(_int); 3112 } 3113 3114 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3115 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3116 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3117 } 3118 3119 #if !COMPILER2_OR_JVMCI 3120 // Don't degrade server performance for footprint 3121 if (FLAG_IS_DEFAULT(UseLargePages) && 3122 MaxHeapSize < LargePageHeapSizeThreshold) { 3123 // No need for large granularity pages w/small heaps. 3124 // Note that large pages are enabled/disabled for both the 3125 // Java heap and the code cache. 3126 FLAG_SET_DEFAULT(UseLargePages, false); 3127 } 3128 3129 UNSUPPORTED_OPTION(ProfileInterpreter); 3130 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3131 #endif 3132 3133 #ifndef TIERED 3134 // Tiered compilation is undefined. 3135 UNSUPPORTED_OPTION(TieredCompilation); 3136 #endif 3137 3138 if (!check_vm_args_consistency()) { 3139 return JNI_ERR; 3140 } 3141 3142 #if INCLUDE_CDS 3143 if (DumpSharedSpaces) { 3144 // Disable biased locking now as it interferes with the clean up of 3145 // the archived Klasses and Java string objects (at dump time only). 3146 UseBiasedLocking = false; 3147 3148 // Always verify non-system classes during CDS dump 3149 if (!BytecodeVerificationRemote) { 3150 BytecodeVerificationRemote = true; 3151 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3152 } 3153 } 3154 if (UseSharedSpaces && patch_mod_javabase) { 3155 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3156 } 3157 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3158 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3159 } 3160 #endif 3161 3162 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3163 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3164 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3165 3166 return JNI_OK; 3167 } 3168 3169 // Helper class for controlling the lifetime of JavaVMInitArgs 3170 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3171 // deleted on the destruction of the ScopedVMInitArgs object. 3172 class ScopedVMInitArgs : public StackObj { 3173 private: 3174 JavaVMInitArgs _args; 3175 char* _container_name; 3176 bool _is_set; 3177 char* _vm_options_file_arg; 3178 3179 public: 3180 ScopedVMInitArgs(const char *container_name) { 3181 _args.version = JNI_VERSION_1_2; 3182 _args.nOptions = 0; 3183 _args.options = NULL; 3184 _args.ignoreUnrecognized = false; 3185 _container_name = (char *)container_name; 3186 _is_set = false; 3187 _vm_options_file_arg = NULL; 3188 } 3189 3190 // Populates the JavaVMInitArgs object represented by this 3191 // ScopedVMInitArgs object with the arguments in options. The 3192 // allocated memory is deleted by the destructor. If this method 3193 // returns anything other than JNI_OK, then this object is in a 3194 // partially constructed state, and should be abandoned. 3195 jint set_args(GrowableArray<JavaVMOption>* options) { 3196 _is_set = true; 3197 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3198 JavaVMOption, options->length(), mtArguments); 3199 if (options_arr == NULL) { 3200 return JNI_ENOMEM; 3201 } 3202 _args.options = options_arr; 3203 3204 for (int i = 0; i < options->length(); i++) { 3205 options_arr[i] = options->at(i); 3206 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3207 if (options_arr[i].optionString == NULL) { 3208 // Rely on the destructor to do cleanup. 3209 _args.nOptions = i; 3210 return JNI_ENOMEM; 3211 } 3212 } 3213 3214 _args.nOptions = options->length(); 3215 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3216 return JNI_OK; 3217 } 3218 3219 JavaVMInitArgs* get() { return &_args; } 3220 char* container_name() { return _container_name; } 3221 bool is_set() { return _is_set; } 3222 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3223 char* vm_options_file_arg() { return _vm_options_file_arg; } 3224 3225 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3226 if (_vm_options_file_arg != NULL) { 3227 os::free(_vm_options_file_arg); 3228 } 3229 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3230 } 3231 3232 ~ScopedVMInitArgs() { 3233 if (_vm_options_file_arg != NULL) { 3234 os::free(_vm_options_file_arg); 3235 } 3236 if (_args.options == NULL) return; 3237 for (int i = 0; i < _args.nOptions; i++) { 3238 os::free(_args.options[i].optionString); 3239 } 3240 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3241 } 3242 3243 // Insert options into this option list, to replace option at 3244 // vm_options_file_pos (-XX:VMOptionsFile) 3245 jint insert(const JavaVMInitArgs* args, 3246 const JavaVMInitArgs* args_to_insert, 3247 const int vm_options_file_pos) { 3248 assert(_args.options == NULL, "shouldn't be set yet"); 3249 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3250 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3251 3252 int length = args->nOptions + args_to_insert->nOptions - 1; 3253 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3254 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3255 for (int i = 0; i < args->nOptions; i++) { 3256 if (i == vm_options_file_pos) { 3257 // insert the new options starting at the same place as the 3258 // -XX:VMOptionsFile option 3259 for (int j = 0; j < args_to_insert->nOptions; j++) { 3260 options->push(args_to_insert->options[j]); 3261 } 3262 } else { 3263 options->push(args->options[i]); 3264 } 3265 } 3266 // make into options array 3267 jint result = set_args(options); 3268 delete options; 3269 return result; 3270 } 3271 }; 3272 3273 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3274 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3275 } 3276 3277 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3278 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3279 } 3280 3281 jint Arguments::parse_options_environment_variable(const char* name, 3282 ScopedVMInitArgs* vm_args) { 3283 char *buffer = ::getenv(name); 3284 3285 // Don't check this environment variable if user has special privileges 3286 // (e.g. unix su command). 3287 if (buffer == NULL || os::have_special_privileges()) { 3288 return JNI_OK; 3289 } 3290 3291 if ((buffer = os::strdup(buffer)) == NULL) { 3292 return JNI_ENOMEM; 3293 } 3294 3295 jio_fprintf(defaultStream::error_stream(), 3296 "Picked up %s: %s\n", name, buffer); 3297 3298 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3299 3300 os::free(buffer); 3301 return retcode; 3302 } 3303 3304 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3305 // read file into buffer 3306 int fd = ::open(file_name, O_RDONLY); 3307 if (fd < 0) { 3308 jio_fprintf(defaultStream::error_stream(), 3309 "Could not open options file '%s'\n", 3310 file_name); 3311 return JNI_ERR; 3312 } 3313 3314 struct stat stbuf; 3315 int retcode = os::stat(file_name, &stbuf); 3316 if (retcode != 0) { 3317 jio_fprintf(defaultStream::error_stream(), 3318 "Could not stat options file '%s'\n", 3319 file_name); 3320 os::close(fd); 3321 return JNI_ERR; 3322 } 3323 3324 if (stbuf.st_size == 0) { 3325 // tell caller there is no option data and that is ok 3326 os::close(fd); 3327 return JNI_OK; 3328 } 3329 3330 // '+ 1' for NULL termination even with max bytes 3331 size_t bytes_alloc = stbuf.st_size + 1; 3332 3333 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3334 if (NULL == buf) { 3335 jio_fprintf(defaultStream::error_stream(), 3336 "Could not allocate read buffer for options file parse\n"); 3337 os::close(fd); 3338 return JNI_ENOMEM; 3339 } 3340 3341 memset(buf, 0, bytes_alloc); 3342 3343 // Fill buffer 3344 // Use ::read() instead of os::read because os::read() 3345 // might do a thread state transition 3346 // and it is too early for that here 3347 3348 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3349 os::close(fd); 3350 if (bytes_read < 0) { 3351 FREE_C_HEAP_ARRAY(char, buf); 3352 jio_fprintf(defaultStream::error_stream(), 3353 "Could not read options file '%s'\n", file_name); 3354 return JNI_ERR; 3355 } 3356 3357 if (bytes_read == 0) { 3358 // tell caller there is no option data and that is ok 3359 FREE_C_HEAP_ARRAY(char, buf); 3360 return JNI_OK; 3361 } 3362 3363 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3364 3365 FREE_C_HEAP_ARRAY(char, buf); 3366 return retcode; 3367 } 3368 3369 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3370 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3371 3372 // some pointers to help with parsing 3373 char *buffer_end = buffer + buf_len; 3374 char *opt_hd = buffer; 3375 char *wrt = buffer; 3376 char *rd = buffer; 3377 3378 // parse all options 3379 while (rd < buffer_end) { 3380 // skip leading white space from the input string 3381 while (rd < buffer_end && isspace(*rd)) { 3382 rd++; 3383 } 3384 3385 if (rd >= buffer_end) { 3386 break; 3387 } 3388 3389 // Remember this is where we found the head of the token. 3390 opt_hd = wrt; 3391 3392 // Tokens are strings of non white space characters separated 3393 // by one or more white spaces. 3394 while (rd < buffer_end && !isspace(*rd)) { 3395 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3396 int quote = *rd; // matching quote to look for 3397 rd++; // don't copy open quote 3398 while (rd < buffer_end && *rd != quote) { 3399 // include everything (even spaces) 3400 // up until the close quote 3401 *wrt++ = *rd++; // copy to option string 3402 } 3403 3404 if (rd < buffer_end) { 3405 rd++; // don't copy close quote 3406 } else { 3407 // did not see closing quote 3408 jio_fprintf(defaultStream::error_stream(), 3409 "Unmatched quote in %s\n", name); 3410 delete options; 3411 return JNI_ERR; 3412 } 3413 } else { 3414 *wrt++ = *rd++; // copy to option string 3415 } 3416 } 3417 3418 // steal a white space character and set it to NULL 3419 *wrt++ = '\0'; 3420 // We now have a complete token 3421 3422 JavaVMOption option; 3423 option.optionString = opt_hd; 3424 option.extraInfo = NULL; 3425 3426 options->append(option); // Fill in option 3427 3428 rd++; // Advance to next character 3429 } 3430 3431 // Fill out JavaVMInitArgs structure. 3432 jint status = vm_args->set_args(options); 3433 3434 delete options; 3435 return status; 3436 } 3437 3438 void Arguments::set_shared_spaces_flags() { 3439 if (DumpSharedSpaces) { 3440 if (FailOverToOldVerifier) { 3441 // Don't fall back to the old verifier on verification failure. If a 3442 // class fails verification with the split verifier, it might fail the 3443 // CDS runtime verifier constraint check. In that case, we don't want 3444 // to share the class. We only archive classes that pass the split verifier. 3445 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3446 } 3447 3448 if (RequireSharedSpaces) { 3449 warning("Cannot dump shared archive while using shared archive"); 3450 } 3451 UseSharedSpaces = false; 3452 #ifdef _LP64 3453 if (!UseCompressedOops || !UseCompressedClassPointers) { 3454 vm_exit_during_initialization( 3455 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3456 } 3457 } else { 3458 if (!UseCompressedOops || !UseCompressedClassPointers) { 3459 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3460 } 3461 #endif 3462 } 3463 } 3464 3465 // Sharing support 3466 // Construct the path to the archive 3467 static char* get_shared_archive_path() { 3468 char *shared_archive_path; 3469 if (SharedArchiveFile == NULL) { 3470 char jvm_path[JVM_MAXPATHLEN]; 3471 os::jvm_path(jvm_path, sizeof(jvm_path)); 3472 char *end = strrchr(jvm_path, *os::file_separator()); 3473 if (end != NULL) *end = '\0'; 3474 size_t jvm_path_len = strlen(jvm_path); 3475 size_t file_sep_len = strlen(os::file_separator()); 3476 const size_t len = jvm_path_len + file_sep_len + 20; 3477 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3478 if (shared_archive_path != NULL) { 3479 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3480 jvm_path, os::file_separator()); 3481 } 3482 } else { 3483 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3484 } 3485 return shared_archive_path; 3486 } 3487 3488 #ifndef PRODUCT 3489 // Determine whether LogVMOutput should be implicitly turned on. 3490 static bool use_vm_log() { 3491 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3492 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3493 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3494 PrintAssembly || TraceDeoptimization || TraceDependencies || 3495 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3496 return true; 3497 } 3498 3499 #ifdef COMPILER1 3500 if (PrintC1Statistics) { 3501 return true; 3502 } 3503 #endif // COMPILER1 3504 3505 #ifdef COMPILER2 3506 if (PrintOptoAssembly || PrintOptoStatistics) { 3507 return true; 3508 } 3509 #endif // COMPILER2 3510 3511 return false; 3512 } 3513 3514 #endif // PRODUCT 3515 3516 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3517 for (int index = 0; index < args->nOptions; index++) { 3518 const JavaVMOption* option = args->options + index; 3519 const char* tail; 3520 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3521 return true; 3522 } 3523 } 3524 return false; 3525 } 3526 3527 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3528 const char* vm_options_file, 3529 const int vm_options_file_pos, 3530 ScopedVMInitArgs* vm_options_file_args, 3531 ScopedVMInitArgs* args_out) { 3532 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3533 if (code != JNI_OK) { 3534 return code; 3535 } 3536 3537 if (vm_options_file_args->get()->nOptions < 1) { 3538 return JNI_OK; 3539 } 3540 3541 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3542 jio_fprintf(defaultStream::error_stream(), 3543 "A VM options file may not refer to a VM options file. " 3544 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3545 "options file '%s' in options container '%s' is an error.\n", 3546 vm_options_file_args->vm_options_file_arg(), 3547 vm_options_file_args->container_name()); 3548 return JNI_EINVAL; 3549 } 3550 3551 return args_out->insert(args, vm_options_file_args->get(), 3552 vm_options_file_pos); 3553 } 3554 3555 // Expand -XX:VMOptionsFile found in args_in as needed. 3556 // mod_args and args_out parameters may return values as needed. 3557 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3558 ScopedVMInitArgs* mod_args, 3559 JavaVMInitArgs** args_out) { 3560 jint code = match_special_option_and_act(args_in, mod_args); 3561 if (code != JNI_OK) { 3562 return code; 3563 } 3564 3565 if (mod_args->is_set()) { 3566 // args_in contains -XX:VMOptionsFile and mod_args contains the 3567 // original options from args_in along with the options expanded 3568 // from the VMOptionsFile. Return a short-hand to the caller. 3569 *args_out = mod_args->get(); 3570 } else { 3571 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3572 } 3573 return JNI_OK; 3574 } 3575 3576 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3577 ScopedVMInitArgs* args_out) { 3578 // Remaining part of option string 3579 const char* tail; 3580 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3581 3582 for (int index = 0; index < args->nOptions; index++) { 3583 const JavaVMOption* option = args->options + index; 3584 if (ArgumentsExt::process_options(option)) { 3585 continue; 3586 } 3587 if (match_option(option, "-XX:Flags=", &tail)) { 3588 Arguments::set_jvm_flags_file(tail); 3589 continue; 3590 } 3591 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3592 if (vm_options_file_args.found_vm_options_file_arg()) { 3593 jio_fprintf(defaultStream::error_stream(), 3594 "The option '%s' is already specified in the options " 3595 "container '%s' so the specification of '%s' in the " 3596 "same options container is an error.\n", 3597 vm_options_file_args.vm_options_file_arg(), 3598 vm_options_file_args.container_name(), 3599 option->optionString); 3600 return JNI_EINVAL; 3601 } 3602 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3603 // If there's a VMOptionsFile, parse that 3604 jint code = insert_vm_options_file(args, tail, index, 3605 &vm_options_file_args, args_out); 3606 if (code != JNI_OK) { 3607 return code; 3608 } 3609 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3610 if (args_out->is_set()) { 3611 // The VMOptions file inserted some options so switch 'args' 3612 // to the new set of options, and continue processing which 3613 // preserves "last option wins" semantics. 3614 args = args_out->get(); 3615 // The first option from the VMOptionsFile replaces the 3616 // current option. So we back track to process the 3617 // replacement option. 3618 index--; 3619 } 3620 continue; 3621 } 3622 if (match_option(option, "-XX:+PrintVMOptions")) { 3623 PrintVMOptions = true; 3624 continue; 3625 } 3626 if (match_option(option, "-XX:-PrintVMOptions")) { 3627 PrintVMOptions = false; 3628 continue; 3629 } 3630 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3631 IgnoreUnrecognizedVMOptions = true; 3632 continue; 3633 } 3634 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3635 IgnoreUnrecognizedVMOptions = false; 3636 continue; 3637 } 3638 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3639 JVMFlag::printFlags(tty, false); 3640 vm_exit(0); 3641 } 3642 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3643 #if INCLUDE_NMT 3644 // The launcher did not setup nmt environment variable properly. 3645 if (!MemTracker::check_launcher_nmt_support(tail)) { 3646 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3647 } 3648 3649 // Verify if nmt option is valid. 3650 if (MemTracker::verify_nmt_option()) { 3651 // Late initialization, still in single-threaded mode. 3652 if (MemTracker::tracking_level() >= NMT_summary) { 3653 MemTracker::init(); 3654 } 3655 } else { 3656 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3657 } 3658 continue; 3659 #else 3660 jio_fprintf(defaultStream::error_stream(), 3661 "Native Memory Tracking is not supported in this VM\n"); 3662 return JNI_ERR; 3663 #endif 3664 } 3665 3666 #ifndef PRODUCT 3667 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3668 JVMFlag::printFlags(tty, true); 3669 vm_exit(0); 3670 } 3671 #endif 3672 } 3673 return JNI_OK; 3674 } 3675 3676 static void print_options(const JavaVMInitArgs *args) { 3677 const char* tail; 3678 for (int index = 0; index < args->nOptions; index++) { 3679 const JavaVMOption *option = args->options + index; 3680 if (match_option(option, "-XX:", &tail)) { 3681 logOption(tail); 3682 } 3683 } 3684 } 3685 3686 bool Arguments::handle_deprecated_print_gc_flags() { 3687 if (PrintGC) { 3688 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3689 } 3690 if (PrintGCDetails) { 3691 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3692 } 3693 3694 if (_gc_log_filename != NULL) { 3695 // -Xloggc was used to specify a filename 3696 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3697 3698 LogTarget(Error, logging) target; 3699 LogStream errstream(target); 3700 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 3701 } else if (PrintGC || PrintGCDetails) { 3702 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3703 } 3704 return true; 3705 } 3706 3707 void Arguments::handle_extra_cms_flags(const char* msg) { 3708 SpecialFlag flag; 3709 const char *flag_name = "UseConcMarkSweepGC"; 3710 if (lookup_special_flag(flag_name, flag)) { 3711 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 3712 warning("%s", msg); 3713 } 3714 } 3715 3716 // Parse entry point called from JNI_CreateJavaVM 3717 3718 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3719 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 3720 3721 // Initialize ranges, constraints and writeables 3722 JVMFlagRangeList::init(); 3723 JVMFlagConstraintList::init(); 3724 JVMFlagWriteableList::init(); 3725 3726 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3727 const char* hotspotrc = ".hotspotrc"; 3728 bool settings_file_specified = false; 3729 bool needs_hotspotrc_warning = false; 3730 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3731 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3732 3733 // Pointers to current working set of containers 3734 JavaVMInitArgs* cur_cmd_args; 3735 JavaVMInitArgs* cur_java_options_args; 3736 JavaVMInitArgs* cur_java_tool_options_args; 3737 3738 // Containers for modified/expanded options 3739 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3740 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3741 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3742 3743 3744 jint code = 3745 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3746 if (code != JNI_OK) { 3747 return code; 3748 } 3749 3750 code = parse_java_options_environment_variable(&initial_java_options_args); 3751 if (code != JNI_OK) { 3752 return code; 3753 } 3754 3755 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3756 &mod_java_tool_options_args, 3757 &cur_java_tool_options_args); 3758 if (code != JNI_OK) { 3759 return code; 3760 } 3761 3762 code = expand_vm_options_as_needed(initial_cmd_args, 3763 &mod_cmd_args, 3764 &cur_cmd_args); 3765 if (code != JNI_OK) { 3766 return code; 3767 } 3768 3769 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3770 &mod_java_options_args, 3771 &cur_java_options_args); 3772 if (code != JNI_OK) { 3773 return code; 3774 } 3775 3776 const char* flags_file = Arguments::get_jvm_flags_file(); 3777 settings_file_specified = (flags_file != NULL); 3778 3779 if (IgnoreUnrecognizedVMOptions) { 3780 cur_cmd_args->ignoreUnrecognized = true; 3781 cur_java_tool_options_args->ignoreUnrecognized = true; 3782 cur_java_options_args->ignoreUnrecognized = true; 3783 } 3784 3785 // Parse specified settings file 3786 if (settings_file_specified) { 3787 if (!process_settings_file(flags_file, true, 3788 cur_cmd_args->ignoreUnrecognized)) { 3789 return JNI_EINVAL; 3790 } 3791 } else { 3792 #ifdef ASSERT 3793 // Parse default .hotspotrc settings file 3794 if (!process_settings_file(".hotspotrc", false, 3795 cur_cmd_args->ignoreUnrecognized)) { 3796 return JNI_EINVAL; 3797 } 3798 #else 3799 struct stat buf; 3800 if (os::stat(hotspotrc, &buf) == 0) { 3801 needs_hotspotrc_warning = true; 3802 } 3803 #endif 3804 } 3805 3806 if (PrintVMOptions) { 3807 print_options(cur_java_tool_options_args); 3808 print_options(cur_cmd_args); 3809 print_options(cur_java_options_args); 3810 } 3811 3812 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3813 jint result = parse_vm_init_args(cur_java_tool_options_args, 3814 cur_java_options_args, 3815 cur_cmd_args); 3816 3817 if (result != JNI_OK) { 3818 return result; 3819 } 3820 3821 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3822 SharedArchivePath = get_shared_archive_path(); 3823 if (SharedArchivePath == NULL) { 3824 return JNI_ENOMEM; 3825 } 3826 3827 // Set up VerifySharedSpaces 3828 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3829 VerifySharedSpaces = true; 3830 } 3831 3832 // Delay warning until here so that we've had a chance to process 3833 // the -XX:-PrintWarnings flag 3834 if (needs_hotspotrc_warning) { 3835 warning("%s file is present but has been ignored. " 3836 "Run with -XX:Flags=%s to load the file.", 3837 hotspotrc, hotspotrc); 3838 } 3839 3840 if (needs_module_property_warning) { 3841 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3842 " names that are reserved for internal use."); 3843 } 3844 3845 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3846 UNSUPPORTED_OPTION(UseLargePages); 3847 #endif 3848 3849 ArgumentsExt::report_unsupported_options(); 3850 3851 #ifndef PRODUCT 3852 if (TraceBytecodesAt != 0) { 3853 TraceBytecodes = true; 3854 } 3855 if (CountCompiledCalls) { 3856 if (UseCounterDecay) { 3857 warning("UseCounterDecay disabled because CountCalls is set"); 3858 UseCounterDecay = false; 3859 } 3860 } 3861 #endif // PRODUCT 3862 3863 if (ScavengeRootsInCode == 0) { 3864 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3865 warning("Forcing ScavengeRootsInCode non-zero"); 3866 } 3867 ScavengeRootsInCode = 1; 3868 } 3869 3870 if (!handle_deprecated_print_gc_flags()) { 3871 return JNI_EINVAL; 3872 } 3873 3874 // Set object alignment values. 3875 set_object_alignment(); 3876 3877 #if !INCLUDE_CDS 3878 if (DumpSharedSpaces || RequireSharedSpaces) { 3879 jio_fprintf(defaultStream::error_stream(), 3880 "Shared spaces are not supported in this VM\n"); 3881 return JNI_ERR; 3882 } 3883 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 3884 log_is_enabled(Info, cds)) { 3885 warning("Shared spaces are not supported in this VM"); 3886 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3887 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3888 } 3889 no_shared_spaces("CDS Disabled"); 3890 #endif // INCLUDE_CDS 3891 3892 return JNI_OK; 3893 } 3894 3895 jint Arguments::apply_ergo() { 3896 // Set flags based on ergonomics. 3897 jint result = set_ergonomics_flags(); 3898 if (result != JNI_OK) return result; 3899 3900 set_shared_spaces_flags(); 3901 3902 // Set heap size based on available physical memory 3903 set_heap_size(); 3904 3905 GCConfig::arguments()->initialize(); 3906 3907 // Initialize Metaspace flags and alignments 3908 Metaspace::ergo_initialize(); 3909 3910 // Set compiler flags after GC is selected and GC specific 3911 // flags (LoopStripMiningIter) are set. 3912 CompilerConfig::ergo_initialize(); 3913 3914 // Set bytecode rewriting flags 3915 set_bytecode_flags(); 3916 3917 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 3918 jint code = set_aggressive_opts_flags(); 3919 if (code != JNI_OK) { 3920 return code; 3921 } 3922 3923 // Turn off biased locking for locking debug mode flags, 3924 // which are subtly different from each other but neither works with 3925 // biased locking 3926 if (UseHeavyMonitors 3927 #ifdef COMPILER1 3928 || !UseFastLocking 3929 #endif // COMPILER1 3930 #if INCLUDE_JVMCI 3931 || !JVMCIUseFastLocking 3932 #endif 3933 ) { 3934 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3935 // flag set to true on command line; warn the user that they 3936 // can't enable biased locking here 3937 warning("Biased Locking is not supported with locking debug flags" 3938 "; ignoring UseBiasedLocking flag." ); 3939 } 3940 UseBiasedLocking = false; 3941 } 3942 3943 #ifdef CC_INTERP 3944 // Clear flags not supported on zero. 3945 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3946 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3947 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3948 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3949 #endif // CC_INTERP 3950 3951 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3952 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3953 DebugNonSafepoints = true; 3954 } 3955 3956 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3957 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3958 } 3959 3960 #ifndef PRODUCT 3961 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3962 if (use_vm_log()) { 3963 LogVMOutput = true; 3964 } 3965 } 3966 #endif // PRODUCT 3967 3968 if (PrintCommandLineFlags) { 3969 JVMFlag::printSetFlags(tty); 3970 } 3971 3972 // Apply CPU specific policy for the BiasedLocking 3973 if (UseBiasedLocking) { 3974 if (!VM_Version::use_biased_locking() && 3975 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3976 UseBiasedLocking = false; 3977 } 3978 } 3979 #ifdef COMPILER2 3980 if (!UseBiasedLocking || EmitSync != 0) { 3981 UseOptoBiasInlining = false; 3982 } 3983 #endif 3984 3985 #if defined(IA32) 3986 // Only server compiler can optimize safepoints well enough. 3987 if (!is_server_compilation_mode_vm()) { 3988 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false); 3989 } 3990 #endif 3991 3992 // ThreadLocalHandshakesConstraintFunc handles the constraints. 3993 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 3994 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 3995 } else { 3996 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 3997 } 3998 3999 return JNI_OK; 4000 } 4001 4002 jint Arguments::adjust_after_os() { 4003 if (UseNUMA) { 4004 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 4005 FLAG_SET_ERGO(bool, UseNUMA, false); 4006 } else if (UseParallelGC || UseParallelOldGC) { 4007 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4008 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4009 } 4010 } 4011 // UseNUMAInterleaving is set to ON for all collectors and 4012 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4013 // such as the parallel collector for Linux and Solaris will 4014 // interleave old gen and survivor spaces on top of NUMA 4015 // allocation policy for the eden space. 4016 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4017 // all platforms and ParallelGC on Windows will interleave all 4018 // of the heap spaces across NUMA nodes. 4019 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4020 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4021 } 4022 } 4023 return JNI_OK; 4024 } 4025 4026 int Arguments::PropertyList_count(SystemProperty* pl) { 4027 int count = 0; 4028 while(pl != NULL) { 4029 count++; 4030 pl = pl->next(); 4031 } 4032 return count; 4033 } 4034 4035 // Return the number of readable properties. 4036 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4037 int count = 0; 4038 while(pl != NULL) { 4039 if (pl->is_readable()) { 4040 count++; 4041 } 4042 pl = pl->next(); 4043 } 4044 return count; 4045 } 4046 4047 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4048 assert(key != NULL, "just checking"); 4049 SystemProperty* prop; 4050 for (prop = pl; prop != NULL; prop = prop->next()) { 4051 if (strcmp(key, prop->key()) == 0) return prop->value(); 4052 } 4053 return NULL; 4054 } 4055 4056 // Return the value of the requested property provided that it is a readable property. 4057 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4058 assert(key != NULL, "just checking"); 4059 SystemProperty* prop; 4060 // Return the property value if the keys match and the property is not internal or 4061 // it's the special internal property "jdk.boot.class.path.append". 4062 for (prop = pl; prop != NULL; prop = prop->next()) { 4063 if (strcmp(key, prop->key()) == 0) { 4064 if (!prop->internal()) { 4065 return prop->value(); 4066 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4067 return prop->value(); 4068 } else { 4069 // Property is internal and not jdk.boot.class.path.append so return NULL. 4070 return NULL; 4071 } 4072 } 4073 } 4074 return NULL; 4075 } 4076 4077 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4078 int count = 0; 4079 const char* ret_val = NULL; 4080 4081 while(pl != NULL) { 4082 if(count >= index) { 4083 ret_val = pl->key(); 4084 break; 4085 } 4086 count++; 4087 pl = pl->next(); 4088 } 4089 4090 return ret_val; 4091 } 4092 4093 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4094 int count = 0; 4095 char* ret_val = NULL; 4096 4097 while(pl != NULL) { 4098 if(count >= index) { 4099 ret_val = pl->value(); 4100 break; 4101 } 4102 count++; 4103 pl = pl->next(); 4104 } 4105 4106 return ret_val; 4107 } 4108 4109 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4110 SystemProperty* p = *plist; 4111 if (p == NULL) { 4112 *plist = new_p; 4113 } else { 4114 while (p->next() != NULL) { 4115 p = p->next(); 4116 } 4117 p->set_next(new_p); 4118 } 4119 } 4120 4121 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4122 bool writeable, bool internal) { 4123 if (plist == NULL) 4124 return; 4125 4126 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4127 PropertyList_add(plist, new_p); 4128 } 4129 4130 void Arguments::PropertyList_add(SystemProperty *element) { 4131 PropertyList_add(&_system_properties, element); 4132 } 4133 4134 // This add maintains unique property key in the list. 4135 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4136 PropertyAppendable append, PropertyWriteable writeable, 4137 PropertyInternal internal) { 4138 if (plist == NULL) 4139 return; 4140 4141 // If property key exist then update with new value. 4142 SystemProperty* prop; 4143 for (prop = *plist; prop != NULL; prop = prop->next()) { 4144 if (strcmp(k, prop->key()) == 0) { 4145 if (append == AppendProperty) { 4146 prop->append_value(v); 4147 } else { 4148 prop->set_value(v); 4149 } 4150 return; 4151 } 4152 } 4153 4154 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4155 } 4156 4157 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4158 // Returns true if all of the source pointed by src has been copied over to 4159 // the destination buffer pointed by buf. Otherwise, returns false. 4160 // Notes: 4161 // 1. If the length (buflen) of the destination buffer excluding the 4162 // NULL terminator character is not long enough for holding the expanded 4163 // pid characters, it also returns false instead of returning the partially 4164 // expanded one. 4165 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4166 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4167 char* buf, size_t buflen) { 4168 const char* p = src; 4169 char* b = buf; 4170 const char* src_end = &src[srclen]; 4171 char* buf_end = &buf[buflen - 1]; 4172 4173 while (p < src_end && b < buf_end) { 4174 if (*p == '%') { 4175 switch (*(++p)) { 4176 case '%': // "%%" ==> "%" 4177 *b++ = *p++; 4178 break; 4179 case 'p': { // "%p" ==> current process id 4180 // buf_end points to the character before the last character so 4181 // that we could write '\0' to the end of the buffer. 4182 size_t buf_sz = buf_end - b + 1; 4183 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4184 4185 // if jio_snprintf fails or the buffer is not long enough to hold 4186 // the expanded pid, returns false. 4187 if (ret < 0 || ret >= (int)buf_sz) { 4188 return false; 4189 } else { 4190 b += ret; 4191 assert(*b == '\0', "fail in copy_expand_pid"); 4192 if (p == src_end && b == buf_end + 1) { 4193 // reach the end of the buffer. 4194 return true; 4195 } 4196 } 4197 p++; 4198 break; 4199 } 4200 default : 4201 *b++ = '%'; 4202 } 4203 } else { 4204 *b++ = *p++; 4205 } 4206 } 4207 *b = '\0'; 4208 return (p == src_end); // return false if not all of the source was copied 4209 }