1 /* 2 * Copyright (c) 1997, 2019, 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/gcArguments.hpp" 33 #include "gc/shared/gcConfig.hpp" 34 #include "logging/log.hpp" 35 #include "logging/logConfiguration.hpp" 36 #include "logging/logStream.hpp" 37 #include "logging/logTag.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/filemap.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "prims/jvmtiExport.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/flags/jvmFlag.hpp" 44 #include "runtime/flags/jvmFlagConstraintList.hpp" 45 #include "runtime/flags/jvmFlagWriteableList.hpp" 46 #include "runtime/flags/jvmFlagRangeList.hpp" 47 #include "runtime/globals_extension.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/os.inline.hpp" 50 #include "runtime/safepoint.hpp" 51 #include "runtime/safepointMechanism.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/align.hpp" 56 #include "utilities/defaultStream.hpp" 57 #include "utilities/macros.hpp" 58 #include "utilities/stringUtils.hpp" 59 #if INCLUDE_JFR 60 #include "jfr/jfr.hpp" 61 #endif 62 63 // Note: This is a special bug reporting site for the JVM 64 #ifdef VENDOR_URL_VM_BUG 65 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG 66 #else 67 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 68 #endif 69 #define DEFAULT_JAVA_LAUNCHER "generic" 70 71 char* Arguments::_jvm_flags_file = NULL; 72 char** Arguments::_jvm_flags_array = NULL; 73 int Arguments::_num_jvm_flags = 0; 74 char** Arguments::_jvm_args_array = NULL; 75 int Arguments::_num_jvm_args = 0; 76 char* Arguments::_java_command = NULL; 77 SystemProperty* Arguments::_system_properties = NULL; 78 const char* Arguments::_gc_log_filename = NULL; 79 size_t Arguments::_conservative_max_heap_alignment = 0; 80 Arguments::Mode Arguments::_mode = _mixed; 81 bool Arguments::_java_compiler = false; 82 bool Arguments::_xdebug_mode = false; 83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 85 int Arguments::_sun_java_launcher_pid = -1; 86 bool Arguments::_sun_java_launcher_is_altjvm = false; 87 88 // These parameters are reset in method parse_vm_init_args() 89 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 90 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 91 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 92 bool Arguments::_ClipInlining = ClipInlining; 93 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 94 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 95 96 bool Arguments::_enable_preview = false; 97 98 char* Arguments::SharedArchivePath = NULL; 99 char* Arguments::SharedDynamicArchivePath = NULL; 100 101 AgentLibraryList Arguments::_libraryList; 102 AgentLibraryList Arguments::_agentList; 103 104 // These are not set by the JDK's built-in launchers, but they can be set by 105 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 106 // JavaVMOption in jni.h. 107 abort_hook_t Arguments::_abort_hook = NULL; 108 exit_hook_t Arguments::_exit_hook = NULL; 109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 110 111 112 SystemProperty *Arguments::_sun_boot_library_path = NULL; 113 SystemProperty *Arguments::_java_library_path = NULL; 114 SystemProperty *Arguments::_java_home = NULL; 115 SystemProperty *Arguments::_java_class_path = NULL; 116 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 117 SystemProperty *Arguments::_vm_info = NULL; 118 119 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 120 PathString *Arguments::_system_boot_class_path = NULL; 121 bool Arguments::_has_jimage = false; 122 123 char* Arguments::_ext_dirs = NULL; 124 125 bool PathString::set_value(const char *value) { 126 if (_value != NULL) { 127 FreeHeap(_value); 128 } 129 _value = AllocateHeap(strlen(value)+1, mtArguments); 130 assert(_value != NULL, "Unable to allocate space for new path value"); 131 if (_value != NULL) { 132 strcpy(_value, value); 133 } else { 134 // not able to allocate 135 return false; 136 } 137 return true; 138 } 139 140 void PathString::append_value(const char *value) { 141 char *sp; 142 size_t len = 0; 143 if (value != NULL) { 144 len = strlen(value); 145 if (_value != NULL) { 146 len += strlen(_value); 147 } 148 sp = AllocateHeap(len+2, mtArguments); 149 assert(sp != NULL, "Unable to allocate space for new append path value"); 150 if (sp != NULL) { 151 if (_value != NULL) { 152 strcpy(sp, _value); 153 strcat(sp, os::path_separator()); 154 strcat(sp, value); 155 FreeHeap(_value); 156 } else { 157 strcpy(sp, value); 158 } 159 _value = sp; 160 } 161 } 162 } 163 164 PathString::PathString(const char* value) { 165 if (value == NULL) { 166 _value = NULL; 167 } else { 168 _value = AllocateHeap(strlen(value)+1, mtArguments); 169 strcpy(_value, value); 170 } 171 } 172 173 PathString::~PathString() { 174 if (_value != NULL) { 175 FreeHeap(_value); 176 _value = NULL; 177 } 178 } 179 180 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 181 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 182 size_t len = strlen(module_name) + 1; 183 _module_name = AllocateHeap(len, mtInternal); 184 strncpy(_module_name, module_name, len); // copy the trailing null 185 _path = new PathString(path); 186 } 187 188 ModulePatchPath::~ModulePatchPath() { 189 if (_module_name != NULL) { 190 FreeHeap(_module_name); 191 _module_name = NULL; 192 } 193 if (_path != NULL) { 194 delete _path; 195 _path = NULL; 196 } 197 } 198 199 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 200 if (key == NULL) { 201 _key = NULL; 202 } else { 203 _key = AllocateHeap(strlen(key)+1, mtArguments); 204 strcpy(_key, key); 205 } 206 _next = NULL; 207 _internal = internal; 208 _writeable = writeable; 209 } 210 211 AgentLibrary::AgentLibrary(const char* name, const char* options, 212 bool is_absolute_path, void* os_lib, 213 bool instrument_lib) { 214 _name = AllocateHeap(strlen(name)+1, mtArguments); 215 strcpy(_name, name); 216 if (options == NULL) { 217 _options = NULL; 218 } else { 219 _options = AllocateHeap(strlen(options)+1, mtArguments); 220 strcpy(_options, options); 221 } 222 _is_absolute_path = is_absolute_path; 223 _os_lib = os_lib; 224 _next = NULL; 225 _state = agent_invalid; 226 _is_static_lib = false; 227 _is_instrument_lib = instrument_lib; 228 } 229 230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 231 // part of the option string. 232 static bool match_option(const JavaVMOption *option, const char* name, 233 const char** tail) { 234 size_t len = strlen(name); 235 if (strncmp(option->optionString, name, len) == 0) { 236 *tail = option->optionString + len; 237 return true; 238 } else { 239 return false; 240 } 241 } 242 243 // Check if 'option' matches 'name'. No "tail" is allowed. 244 static bool match_option(const JavaVMOption *option, const char* name) { 245 const char* tail = NULL; 246 bool result = match_option(option, name, &tail); 247 if (tail != NULL && *tail == '\0') { 248 return result; 249 } else { 250 return false; 251 } 252 } 253 254 // Return true if any of the strings in null-terminated array 'names' matches. 255 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 256 // the option must match exactly. 257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 258 bool tail_allowed) { 259 for (/* empty */; *names != NULL; ++names) { 260 if (match_option(option, *names, tail)) { 261 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 262 return true; 263 } 264 } 265 } 266 return false; 267 } 268 269 #if INCLUDE_JFR 270 static bool _has_jfr_option = false; // is using JFR 271 272 // 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 _has_jfr_option = true; 278 return Jfr::on_start_flight_recording_option(option, tail); 279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 280 _has_jfr_option = true; 281 return Jfr::on_flight_recorder_option(option, tail); 282 } 283 return false; 284 } 285 286 bool Arguments::has_jfr_option() { 287 return _has_jfr_option; 288 } 289 #endif 290 291 static void logOption(const char* opt) { 292 if (PrintVMOptions) { 293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 294 } 295 } 296 297 bool needs_module_property_warning = false; 298 299 #define MODULE_PROPERTY_PREFIX "jdk.module." 300 #define MODULE_PROPERTY_PREFIX_LEN 11 301 #define ADDEXPORTS "addexports" 302 #define ADDEXPORTS_LEN 10 303 #define ADDREADS "addreads" 304 #define ADDREADS_LEN 8 305 #define ADDOPENS "addopens" 306 #define ADDOPENS_LEN 8 307 #define PATCH "patch" 308 #define PATCH_LEN 5 309 #define ADDMODS "addmods" 310 #define ADDMODS_LEN 7 311 #define LIMITMODS "limitmods" 312 #define LIMITMODS_LEN 9 313 #define PATH "path" 314 #define PATH_LEN 4 315 #define UPGRADE_PATH "upgrade.path" 316 #define UPGRADE_PATH_LEN 12 317 318 void Arguments::add_init_library(const char* name, char* options) { 319 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 320 } 321 322 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 323 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 324 } 325 326 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 327 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 328 } 329 330 // Late-binding agents not started via arguments 331 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 332 _agentList.add(agentLib); 333 } 334 335 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 336 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 337 return ((strncmp(option, property, len) == 0) && 338 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 339 } 340 341 // Return true if property starts with "jdk.module." and its ensuing chars match 342 // any of the reserved module properties. 343 // property should be passed without the leading "-D". 344 bool Arguments::is_internal_module_property(const char* property) { 345 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 346 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 347 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 348 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 349 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 350 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 351 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 352 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 353 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 354 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 355 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 356 return true; 357 } 358 } 359 return false; 360 } 361 362 // Process java launcher properties. 363 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 364 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 365 // sun.java.launcher.pid is defined. 366 // Must do this before setting up other system properties, 367 // as some of them may depend on launcher type. 368 for (int index = 0; index < args->nOptions; index++) { 369 const JavaVMOption* option = args->options + index; 370 const char* tail; 371 372 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 373 process_java_launcher_argument(tail, option->extraInfo); 374 continue; 375 } 376 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 377 if (strcmp(tail, "true") == 0) { 378 _sun_java_launcher_is_altjvm = true; 379 } 380 continue; 381 } 382 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 383 _sun_java_launcher_pid = atoi(tail); 384 continue; 385 } 386 } 387 } 388 389 // Initialize system properties key and value. 390 void Arguments::init_system_properties() { 391 392 // Set up _system_boot_class_path which is not a property but 393 // relies heavily on argument processing and the jdk.boot.class.path.append 394 // property. It is used to store the underlying system boot class path. 395 _system_boot_class_path = new PathString(NULL); 396 397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 398 "Java Virtual Machine Specification", false)); 399 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 401 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 402 403 // Initialize the vm.info now, but it will need updating after argument parsing. 404 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 405 406 // Following are JVMTI agent writable properties. 407 // Properties values are set to NULL and they are 408 // os specific they are initialized in os::init_system_properties_values(). 409 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 410 _java_library_path = new SystemProperty("java.library.path", NULL, true); 411 _java_home = new SystemProperty("java.home", NULL, true); 412 _java_class_path = new SystemProperty("java.class.path", "", true); 413 // jdk.boot.class.path.append is a non-writeable, internal property. 414 // It can only be set by either: 415 // - -Xbootclasspath/a: 416 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 417 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 418 419 // Add to System Property list. 420 PropertyList_add(&_system_properties, _sun_boot_library_path); 421 PropertyList_add(&_system_properties, _java_library_path); 422 PropertyList_add(&_system_properties, _java_home); 423 PropertyList_add(&_system_properties, _java_class_path); 424 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 425 PropertyList_add(&_system_properties, _vm_info); 426 427 // Set OS specific system properties values 428 os::init_system_properties_values(); 429 } 430 431 // Update/Initialize System properties after JDK version number is known 432 void Arguments::init_version_specific_system_properties() { 433 enum { bufsz = 16 }; 434 char buffer[bufsz]; 435 const char* spec_vendor = "Oracle Corporation"; 436 uint32_t spec_version = JDK_Version::current().major_version(); 437 438 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 439 440 PropertyList_add(&_system_properties, 441 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 442 PropertyList_add(&_system_properties, 443 new SystemProperty("java.vm.specification.version", buffer, false)); 444 PropertyList_add(&_system_properties, 445 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 446 } 447 448 /* 449 * -XX argument processing: 450 * 451 * -XX arguments are defined in several places, such as: 452 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 453 * -XX arguments are parsed in parse_argument(). 454 * -XX argument bounds checking is done in check_vm_args_consistency(). 455 * 456 * Over time -XX arguments may change. There are mechanisms to handle common cases: 457 * 458 * ALIASED: An option that is simply another name for another option. This is often 459 * part of the process of deprecating a flag, but not all aliases need 460 * to be deprecated. 461 * 462 * Create an alias for an option by adding the old and new option names to the 463 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 464 * 465 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 466 * support may be removed in the future. Both regular and aliased options may be 467 * deprecated. 468 * 469 * Add a deprecation warning for an option (or alias) by adding an entry in the 470 * "special_jvm_flags" table and setting the "deprecated_in" field. 471 * Often an option "deprecated" in one major release will 472 * be made "obsolete" in the next. In this case the entry should also have its 473 * "obsolete_in" field set. 474 * 475 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 476 * on the command line. A warning is printed to let the user know that option might not 477 * be accepted in the future. 478 * 479 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 480 * table and setting the "obsolete_in" field. 481 * 482 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 483 * to the current JDK version. The system will flatly refuse to admit the existence of 484 * the flag. This allows a flag to die automatically over JDK releases. 485 * 486 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 487 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 488 * - Newly obsolete or expired deprecated options should have their global variable 489 * definitions removed (from globals.hpp, etc) and related implementations removed. 490 * 491 * Recommended approach for removing options: 492 * 493 * To remove options commonly used by customers (e.g. product -XX options), use 494 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 495 * 496 * To remove internal options (e.g. diagnostic, experimental, develop options), use 497 * a 2-step model adding major release numbers to the obsolete and expire columns. 498 * 499 * To change the name of an option, use the alias table as well as a 2-step 500 * model adding major release numbers to the deprecate and expire columns. 501 * Think twice about aliasing commonly used customer options. 502 * 503 * There are times when it is appropriate to leave a future release number as undefined. 504 * 505 * Tests: Aliases should be tested in VMAliasOptions.java. 506 * Deprecated options should be tested in VMDeprecatedOptions.java. 507 */ 508 509 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 510 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 511 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 512 // the command-line as usual, but will issue a warning. 513 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 514 // the command-line, while issuing a warning and ignoring the flag value. 515 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 516 // existence of the flag. 517 // 518 // MANUAL CLEANUP ON JDK VERSION UPDATES: 519 // This table ensures that the handling of options will update automatically when the JDK 520 // version is incremented, but the source code needs to be cleanup up manually: 521 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 522 // variable should be removed, as well as users of the variable. 523 // - As "deprecated" options age into "obsolete" options, move the entry into the 524 // "Obsolete Flags" section of the table. 525 // - All expired options should be removed from the table. 526 static SpecialFlag const special_jvm_flags[] = { 527 // -------------- Deprecated Flags -------------- 528 // --- Non-alias flags - sorted by obsolete_in then expired_in: 529 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 530 { "UseConcMarkSweepGC", JDK_Version::jdk(9), 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::jdk(12), JDK_Version::undefined() }, 535 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() }, 536 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 537 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 538 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 539 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 540 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 541 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 542 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 543 544 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 545 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 546 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 547 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 548 549 // -------------- Obsolete Flags - sorted by expired_in -------------- 550 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 551 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 552 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 553 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 554 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 555 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 556 { "FailOverToOldVerifier", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 557 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 558 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 559 560 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 561 // These entries will generate build errors. Their purpose is to test the macros. 562 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 563 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 564 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 565 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 566 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 567 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 568 #endif 569 570 { NULL, JDK_Version(0), JDK_Version(0) } 571 }; 572 573 // Flags that are aliases for other flags. 574 typedef struct { 575 const char* alias_name; 576 const char* real_name; 577 } AliasedFlag; 578 579 static AliasedFlag const aliased_jvm_flags[] = { 580 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 581 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 582 { NULL, NULL} 583 }; 584 585 // NOTE: A compatibility request will be necessary for each alias to be removed. 586 static AliasedLoggingFlag const aliased_logging_flags[] = { 587 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 588 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 589 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 590 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 591 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 592 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 593 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 594 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 595 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 596 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 597 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) }, 598 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 599 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 600 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 601 { "TraceNMethodInstalls", LogLevel::Info, true, LOG_TAGS(nmethod, install) }, 602 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 603 }; 604 605 #ifndef PRODUCT 606 // These options are removed in jdk9. Remove this code for jdk10. 607 static AliasedFlag const removed_develop_logging_flags[] = { 608 { "TraceClassInitialization", "-Xlog:class+init" }, 609 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 610 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 611 { "TraceItables", "-Xlog:itables=debug" }, 612 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 613 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 614 { "TraceStartupTime", "-Xlog:startuptime" }, 615 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 616 { "PrintVtables", "-Xlog:vtables=debug" }, 617 { "VerboseVerification", "-Xlog:verification" }, 618 { NULL, NULL } 619 }; 620 #endif //PRODUCT 621 622 // Return true if "v" is less than "other", where "other" may be "undefined". 623 static bool version_less_than(JDK_Version v, JDK_Version other) { 624 assert(!v.is_undefined(), "must be defined"); 625 if (!other.is_undefined() && v.compare(other) >= 0) { 626 return false; 627 } else { 628 return true; 629 } 630 } 631 632 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 633 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 634 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 635 flag = special_jvm_flags[i]; 636 return true; 637 } 638 } 639 return false; 640 } 641 642 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 643 assert(version != NULL, "Must provide a version buffer"); 644 SpecialFlag flag; 645 if (lookup_special_flag(flag_name, flag)) { 646 if (!flag.obsolete_in.is_undefined()) { 647 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 648 *version = flag.obsolete_in; 649 return true; 650 } 651 } 652 } 653 return false; 654 } 655 656 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 657 assert(version != NULL, "Must provide a version buffer"); 658 SpecialFlag flag; 659 if (lookup_special_flag(flag_name, flag)) { 660 if (!flag.deprecated_in.is_undefined()) { 661 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 662 version_less_than(JDK_Version::current(), flag.expired_in)) { 663 *version = flag.deprecated_in; 664 return 1; 665 } else { 666 return -1; 667 } 668 } 669 } 670 return 0; 671 } 672 673 #ifndef PRODUCT 674 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 675 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 676 const AliasedFlag& flag = removed_develop_logging_flags[i]; 677 if (strcmp(flag.alias_name, name) == 0) { 678 return flag.real_name; 679 } 680 } 681 return NULL; 682 } 683 #endif // PRODUCT 684 685 const char* Arguments::real_flag_name(const char *flag_name) { 686 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 687 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 688 if (strcmp(flag_status.alias_name, flag_name) == 0) { 689 return flag_status.real_name; 690 } 691 } 692 return flag_name; 693 } 694 695 #ifdef ASSERT 696 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 697 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 698 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 699 return true; 700 } 701 } 702 return false; 703 } 704 705 // Verifies the correctness of the entries in the special_jvm_flags table. 706 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 707 // version being earlier than the deprecation version, then a warning is issued 708 // and verification fails - by returning false. If it is detected that the table 709 // is out of date, with respect to the current version, then a warning is issued 710 // but verification does not fail. This allows the VM to operate when the version 711 // is first updated, without needing to update all the impacted flags at the 712 // same time. 713 static bool verify_special_jvm_flags() { 714 bool success = true; 715 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 716 const SpecialFlag& flag = special_jvm_flags[i]; 717 if (lookup_special_flag(flag.name, i)) { 718 warning("Duplicate special flag declaration \"%s\"", flag.name); 719 success = false; 720 } 721 if (flag.deprecated_in.is_undefined() && 722 flag.obsolete_in.is_undefined()) { 723 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 724 success = false; 725 } 726 727 if (!flag.deprecated_in.is_undefined()) { 728 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 729 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 730 success = false; 731 } 732 733 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 734 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 735 success = false; 736 } 737 } 738 739 if (!flag.obsolete_in.is_undefined()) { 740 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 741 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 742 success = false; 743 } 744 745 // if flag has become obsolete it should not have a "globals" flag defined anymore. 746 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 747 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 748 // Temporarily disable the warning: 8196739 749 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 750 } 751 } 752 } 753 754 if (!flag.expired_in.is_undefined()) { 755 // if flag has become expired it should not have a "globals" flag defined anymore. 756 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 757 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 758 // Temporarily disable the warning: 8196739 759 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 760 } 761 } 762 } 763 764 } 765 return success; 766 } 767 #endif 768 769 // Parses a size specification string. 770 bool Arguments::atojulong(const char *s, julong* result) { 771 julong n = 0; 772 773 // First char must be a digit. Don't allow negative numbers or leading spaces. 774 if (!isdigit(*s)) { 775 return false; 776 } 777 778 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 779 char* remainder; 780 errno = 0; 781 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 782 if (errno != 0) { 783 return false; 784 } 785 786 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 787 if (remainder == s || strlen(remainder) > 1) { 788 return false; 789 } 790 791 switch (*remainder) { 792 case 'T': case 't': 793 *result = n * G * K; 794 // Check for overflow. 795 if (*result/((julong)G * K) != n) return false; 796 return true; 797 case 'G': case 'g': 798 *result = n * G; 799 if (*result/G != n) return false; 800 return true; 801 case 'M': case 'm': 802 *result = n * M; 803 if (*result/M != n) return false; 804 return true; 805 case 'K': case 'k': 806 *result = n * K; 807 if (*result/K != n) return false; 808 return true; 809 case '\0': 810 *result = n; 811 return true; 812 default: 813 return false; 814 } 815 } 816 817 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 818 if (size < min_size) return arg_too_small; 819 if (size > max_size) return arg_too_big; 820 return arg_in_range; 821 } 822 823 // Describe an argument out of range error 824 void Arguments::describe_range_error(ArgsRange errcode) { 825 switch(errcode) { 826 case arg_too_big: 827 jio_fprintf(defaultStream::error_stream(), 828 "The specified size exceeds the maximum " 829 "representable size.\n"); 830 break; 831 case arg_too_small: 832 case arg_unreadable: 833 case arg_in_range: 834 // do nothing for now 835 break; 836 default: 837 ShouldNotReachHere(); 838 } 839 } 840 841 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) { 842 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) { 843 return true; 844 } else { 845 return false; 846 } 847 } 848 849 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 850 char* end; 851 errno = 0; 852 double v = strtod(value, &end); 853 if ((errno != 0) || (*end != 0)) { 854 return false; 855 } 856 857 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) { 858 return true; 859 } 860 return false; 861 } 862 863 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 864 julong v; 865 int int_v; 866 intx intx_v; 867 bool is_neg = false; 868 869 if (flag == NULL) { 870 return false; 871 } 872 873 // Check the sign first since atojulong() parses only unsigned values. 874 if (*value == '-') { 875 if (!flag->is_intx() && !flag->is_int()) { 876 return false; 877 } 878 value++; 879 is_neg = true; 880 } 881 if (!Arguments::atojulong(value, &v)) { 882 return false; 883 } 884 if (flag->is_int()) { 885 int_v = (int) v; 886 if (is_neg) { 887 int_v = -int_v; 888 } 889 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS; 890 } else if (flag->is_uint()) { 891 uint uint_v = (uint) v; 892 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS; 893 } else if (flag->is_intx()) { 894 intx_v = (intx) v; 895 if (is_neg) { 896 intx_v = -intx_v; 897 } 898 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS; 899 } else if (flag->is_uintx()) { 900 uintx uintx_v = (uintx) v; 901 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS; 902 } else if (flag->is_uint64_t()) { 903 uint64_t uint64_t_v = (uint64_t) v; 904 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS; 905 } else if (flag->is_size_t()) { 906 size_t size_t_v = (size_t) v; 907 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS; 908 } else if (flag->is_double()) { 909 double double_v = (double) v; 910 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS; 911 } else { 912 return false; 913 } 914 } 915 916 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) { 917 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false; 918 // Contract: JVMFlag always returns a pointer that needs freeing. 919 FREE_C_HEAP_ARRAY(char, value); 920 return true; 921 } 922 923 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) { 924 const char* old_value = ""; 925 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false; 926 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 927 size_t new_len = strlen(new_value); 928 const char* value; 929 char* free_this_too = NULL; 930 if (old_len == 0) { 931 value = new_value; 932 } else if (new_len == 0) { 933 value = old_value; 934 } else { 935 size_t length = old_len + 1 + new_len + 1; 936 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 937 // each new setting adds another LINE to the switch: 938 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 939 value = buf; 940 free_this_too = buf; 941 } 942 (void) JVMFlag::ccstrAtPut(flag, &value, origin); 943 // JVMFlag always returns a pointer that needs freeing. 944 FREE_C_HEAP_ARRAY(char, value); 945 // JVMFlag made its own copy, so I must delete my own temp. buffer. 946 FREE_C_HEAP_ARRAY(char, free_this_too); 947 return true; 948 } 949 950 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 951 const char* real_name = real_flag_name(arg); 952 JDK_Version since = JDK_Version(); 953 switch (is_deprecated_flag(arg, &since)) { 954 case -1: 955 return NULL; // obsolete or expired, don't process normally 956 case 0: 957 return real_name; 958 case 1: { 959 if (warn) { 960 char version[256]; 961 since.to_string(version, sizeof(version)); 962 if (real_name != arg) { 963 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 964 arg, version, real_name); 965 } else { 966 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 967 arg, version); 968 } 969 } 970 return real_name; 971 } 972 } 973 ShouldNotReachHere(); 974 return NULL; 975 } 976 977 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 978 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 979 // Set tagset string buffer at max size of 256, large enough for any alias tagset 980 const int max_tagset_size = 256; 981 int max_tagset_len = max_tagset_size - 1; 982 char tagset_buffer[max_tagset_size]; 983 tagset_buffer[0] = '\0'; 984 985 // Write tag-set for aliased logging option, in string list form 986 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 987 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 988 if (i > 0) { 989 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 990 } 991 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 992 } 993 if (!alf.exactMatch) { 994 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 995 } 996 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 997 (on) ? "+" : "-", 998 name, 999 tagset_buffer, 1000 (on) ? LogLevel::name(alf.level) : "off"); 1001 } 1002 1003 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 1004 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 1005 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1006 if (strcmp(alf.alias_name, name) == 0) { 1007 log_deprecated_flag(name, on, alf); 1008 return alf; 1009 } 1010 } 1011 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1012 return a; 1013 } 1014 1015 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) { 1016 1017 // range of acceptable characters spelled out for portability reasons 1018 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1019 #define BUFLEN 255 1020 char name[BUFLEN+1]; 1021 char dummy; 1022 const char* real_name; 1023 bool warn_if_deprecated = true; 1024 1025 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1026 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1027 if (alf.alias_name != NULL){ 1028 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1029 return true; 1030 } 1031 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1032 if (real_name == NULL) { 1033 return false; 1034 } 1035 JVMFlag* flag = JVMFlag::find_flag(real_name); 1036 return set_bool_flag(flag, false, origin); 1037 } 1038 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1039 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1040 if (alf.alias_name != NULL){ 1041 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1042 return true; 1043 } 1044 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1045 if (real_name == NULL) { 1046 return false; 1047 } 1048 JVMFlag* flag = JVMFlag::find_flag(real_name); 1049 return set_bool_flag(flag, true, origin); 1050 } 1051 1052 char punct; 1053 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1054 const char* value = strchr(arg, '=') + 1; 1055 1056 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1057 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1058 if (alf.alias_name != NULL) { 1059 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1060 return true; 1061 } 1062 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1063 if (real_name == NULL) { 1064 return false; 1065 } 1066 JVMFlag* flag = JVMFlag::find_flag(real_name); 1067 if (flag != NULL && flag->is_ccstr()) { 1068 if (flag->ccstr_accumulates()) { 1069 return append_to_string_flag(flag, value, origin); 1070 } else { 1071 if (value[0] == '\0') { 1072 value = NULL; 1073 } 1074 return set_string_flag(flag, value, origin); 1075 } 1076 } else { 1077 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1078 } 1079 } 1080 1081 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1082 const char* value = strchr(arg, '=') + 1; 1083 // -XX:Foo:=xxx will reset the string flag to the given value. 1084 if (value[0] == '\0') { 1085 value = NULL; 1086 } 1087 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1088 if (real_name == NULL) { 1089 return false; 1090 } 1091 JVMFlag* flag = JVMFlag::find_flag(real_name); 1092 return set_string_flag(flag, value, origin); 1093 } 1094 1095 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1096 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1097 #define NUMBER_RANGE "[0123456789eE+-]" 1098 char value[BUFLEN + 1]; 1099 char value2[BUFLEN + 1]; 1100 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1101 // Looks like a floating-point number -- try again with more lenient format string 1102 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1103 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1104 if (real_name == NULL) { 1105 return false; 1106 } 1107 JVMFlag* flag = JVMFlag::find_flag(real_name); 1108 return set_fp_numeric_flag(flag, value, origin); 1109 } 1110 } 1111 1112 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1113 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1114 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1115 if (real_name == NULL) { 1116 return false; 1117 } 1118 JVMFlag* flag = JVMFlag::find_flag(real_name); 1119 return set_numeric_flag(flag, value, origin); 1120 } 1121 1122 return false; 1123 } 1124 1125 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1126 assert(bldarray != NULL, "illegal argument"); 1127 1128 if (arg == NULL) { 1129 return; 1130 } 1131 1132 int new_count = *count + 1; 1133 1134 // expand the array and add arg to the last element 1135 if (*bldarray == NULL) { 1136 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1137 } else { 1138 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1139 } 1140 (*bldarray)[*count] = os::strdup_check_oom(arg); 1141 *count = new_count; 1142 } 1143 1144 void Arguments::build_jvm_args(const char* arg) { 1145 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1146 } 1147 1148 void Arguments::build_jvm_flags(const char* arg) { 1149 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1150 } 1151 1152 // utility function to return a string that concatenates all 1153 // strings in a given char** array 1154 const char* Arguments::build_resource_string(char** args, int count) { 1155 if (args == NULL || count == 0) { 1156 return NULL; 1157 } 1158 size_t length = 0; 1159 for (int i = 0; i < count; i++) { 1160 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1161 } 1162 char* s = NEW_RESOURCE_ARRAY(char, length); 1163 char* dst = s; 1164 for (int j = 0; j < count; j++) { 1165 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1166 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1167 dst += offset; 1168 length -= offset; 1169 } 1170 return (const char*) s; 1171 } 1172 1173 void Arguments::print_on(outputStream* st) { 1174 st->print_cr("VM Arguments:"); 1175 if (num_jvm_flags() > 0) { 1176 st->print("jvm_flags: "); print_jvm_flags_on(st); 1177 st->cr(); 1178 } 1179 if (num_jvm_args() > 0) { 1180 st->print("jvm_args: "); print_jvm_args_on(st); 1181 st->cr(); 1182 } 1183 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1184 if (_java_class_path != NULL) { 1185 char* path = _java_class_path->value(); 1186 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1187 } 1188 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1189 } 1190 1191 void Arguments::print_summary_on(outputStream* st) { 1192 // Print the command line. Environment variables that are helpful for 1193 // reproducing the problem are written later in the hs_err file. 1194 // flags are from setting file 1195 if (num_jvm_flags() > 0) { 1196 st->print_raw("Settings File: "); 1197 print_jvm_flags_on(st); 1198 st->cr(); 1199 } 1200 // args are the command line and environment variable arguments. 1201 st->print_raw("Command Line: "); 1202 if (num_jvm_args() > 0) { 1203 print_jvm_args_on(st); 1204 } 1205 // this is the classfile and any arguments to the java program 1206 if (java_command() != NULL) { 1207 st->print("%s", java_command()); 1208 } 1209 st->cr(); 1210 } 1211 1212 void Arguments::print_jvm_flags_on(outputStream* st) { 1213 if (_num_jvm_flags > 0) { 1214 for (int i=0; i < _num_jvm_flags; i++) { 1215 st->print("%s ", _jvm_flags_array[i]); 1216 } 1217 } 1218 } 1219 1220 void Arguments::print_jvm_args_on(outputStream* st) { 1221 if (_num_jvm_args > 0) { 1222 for (int i=0; i < _num_jvm_args; i++) { 1223 st->print("%s ", _jvm_args_array[i]); 1224 } 1225 } 1226 } 1227 1228 bool Arguments::process_argument(const char* arg, 1229 jboolean ignore_unrecognized, 1230 JVMFlag::Flags origin) { 1231 JDK_Version since = JDK_Version(); 1232 1233 if (parse_argument(arg, origin)) { 1234 return true; 1235 } 1236 1237 // Determine if the flag has '+', '-', or '=' characters. 1238 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1239 const char* const argname = has_plus_minus ? arg + 1 : arg; 1240 1241 size_t arg_len; 1242 const char* equal_sign = strchr(argname, '='); 1243 if (equal_sign == NULL) { 1244 arg_len = strlen(argname); 1245 } else { 1246 arg_len = equal_sign - argname; 1247 } 1248 1249 // Only make the obsolete check for valid arguments. 1250 if (arg_len <= BUFLEN) { 1251 // Construct a string which consists only of the argument name without '+', '-', or '='. 1252 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1253 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1254 if (is_obsolete_flag(stripped_argname, &since)) { 1255 char version[256]; 1256 since.to_string(version, sizeof(version)); 1257 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1258 return true; 1259 } 1260 #ifndef PRODUCT 1261 else { 1262 const char* replacement; 1263 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1264 log_warning(arguments)("%s has been removed. Please use %s instead.", 1265 stripped_argname, 1266 replacement); 1267 return false; 1268 } 1269 } 1270 #endif //PRODUCT 1271 } 1272 1273 // For locked flags, report a custom error message if available. 1274 // Otherwise, report the standard unrecognized VM option. 1275 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1276 if (found_flag != NULL) { 1277 char locked_message_buf[BUFLEN]; 1278 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1279 if (strlen(locked_message_buf) == 0) { 1280 if (found_flag->is_bool() && !has_plus_minus) { 1281 jio_fprintf(defaultStream::error_stream(), 1282 "Missing +/- setting for VM option '%s'\n", argname); 1283 } else if (!found_flag->is_bool() && has_plus_minus) { 1284 jio_fprintf(defaultStream::error_stream(), 1285 "Unexpected +/- setting in VM option '%s'\n", argname); 1286 } else { 1287 jio_fprintf(defaultStream::error_stream(), 1288 "Improperly specified VM option '%s'\n", argname); 1289 } 1290 } else { 1291 #ifdef PRODUCT 1292 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1293 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1294 if (ignore_unrecognized && mismatched) { 1295 return true; 1296 } 1297 #endif 1298 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1299 } 1300 } else { 1301 if (ignore_unrecognized) { 1302 return true; 1303 } 1304 jio_fprintf(defaultStream::error_stream(), 1305 "Unrecognized VM option '%s'\n", argname); 1306 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1307 if (fuzzy_matched != NULL) { 1308 jio_fprintf(defaultStream::error_stream(), 1309 "Did you mean '%s%s%s'? ", 1310 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1311 fuzzy_matched->_name, 1312 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1313 } 1314 } 1315 1316 // allow for commandline "commenting out" options like -XX:#+Verbose 1317 return arg[0] == '#'; 1318 } 1319 1320 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1321 FILE* stream = fopen(file_name, "rb"); 1322 if (stream == NULL) { 1323 if (should_exist) { 1324 jio_fprintf(defaultStream::error_stream(), 1325 "Could not open settings file %s\n", file_name); 1326 return false; 1327 } else { 1328 return true; 1329 } 1330 } 1331 1332 char token[1024]; 1333 int pos = 0; 1334 1335 bool in_white_space = true; 1336 bool in_comment = false; 1337 bool in_quote = false; 1338 char quote_c = 0; 1339 bool result = true; 1340 1341 int c = getc(stream); 1342 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1343 if (in_white_space) { 1344 if (in_comment) { 1345 if (c == '\n') in_comment = false; 1346 } else { 1347 if (c == '#') in_comment = true; 1348 else if (!isspace(c)) { 1349 in_white_space = false; 1350 token[pos++] = c; 1351 } 1352 } 1353 } else { 1354 if (c == '\n' || (!in_quote && isspace(c))) { 1355 // token ends at newline, or at unquoted whitespace 1356 // this allows a way to include spaces in string-valued options 1357 token[pos] = '\0'; 1358 logOption(token); 1359 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1360 build_jvm_flags(token); 1361 pos = 0; 1362 in_white_space = true; 1363 in_quote = false; 1364 } else if (!in_quote && (c == '\'' || c == '"')) { 1365 in_quote = true; 1366 quote_c = c; 1367 } else if (in_quote && (c == quote_c)) { 1368 in_quote = false; 1369 } else { 1370 token[pos++] = c; 1371 } 1372 } 1373 c = getc(stream); 1374 } 1375 if (pos > 0) { 1376 token[pos] = '\0'; 1377 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1378 build_jvm_flags(token); 1379 } 1380 fclose(stream); 1381 return result; 1382 } 1383 1384 //============================================================================================================= 1385 // Parsing of properties (-D) 1386 1387 const char* Arguments::get_property(const char* key) { 1388 return PropertyList_get_value(system_properties(), key); 1389 } 1390 1391 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1392 const char* eq = strchr(prop, '='); 1393 const char* key; 1394 const char* value = ""; 1395 1396 if (eq == NULL) { 1397 // property doesn't have a value, thus use passed string 1398 key = prop; 1399 } else { 1400 // property have a value, thus extract it and save to the 1401 // allocated string 1402 size_t key_len = eq - prop; 1403 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1404 1405 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1406 key = tmp_key; 1407 1408 value = &prop[key_len + 1]; 1409 } 1410 1411 if (strcmp(key, "java.compiler") == 0) { 1412 process_java_compiler_argument(value); 1413 // Record value in Arguments, but let it get passed to Java. 1414 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1415 strcmp(key, "sun.java.launcher.pid") == 0) { 1416 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1417 // private and are processed in process_sun_java_launcher_properties(); 1418 // the sun.java.launcher property is passed on to the java application 1419 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1420 // append is true, writable is true, internal is false 1421 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1422 WriteableProperty, ExternalProperty); 1423 } else { 1424 if (strcmp(key, "sun.java.command") == 0) { 1425 char *old_java_command = _java_command; 1426 _java_command = os::strdup_check_oom(value, mtArguments); 1427 if (old_java_command != NULL) { 1428 os::free(old_java_command); 1429 } 1430 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1431 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1432 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1433 // its value without going through the property list or making a Java call. 1434 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1435 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1436 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1437 os::free((void *)old_java_vendor_url_bug); 1438 } 1439 } 1440 1441 // Create new property and add at the end of the list 1442 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1443 } 1444 1445 if (key != prop) { 1446 // SystemProperty copy passed value, thus free previously allocated 1447 // memory 1448 FreeHeap((void *)key); 1449 } 1450 1451 return true; 1452 } 1453 1454 #if INCLUDE_CDS 1455 const char* unsupported_properties[] = { "jdk.module.limitmods", 1456 "jdk.module.upgrade.path", 1457 "jdk.module.patch.0" }; 1458 const char* unsupported_options[] = { "--limit-modules", 1459 "--upgrade-module-path", 1460 "--patch-module" 1461 }; 1462 void Arguments::check_unsupported_dumping_properties() { 1463 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, 1464 "this function is only used with CDS dump time"); 1465 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1466 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1467 SystemProperty* sp = system_properties(); 1468 while (sp != NULL) { 1469 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1470 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1471 vm_exit_during_initialization( 1472 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1473 } 1474 } 1475 sp = sp->next(); 1476 } 1477 1478 // Check for an exploded module build in use with -Xshare:dump. 1479 if (!has_jimage()) { 1480 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1481 } 1482 } 1483 1484 bool Arguments::check_unsupported_cds_runtime_properties() { 1485 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1486 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1487 if (ArchiveClassesAtExit != NULL) { 1488 // dynamic dumping, just return false for now. 1489 // check_unsupported_dumping_properties() will be called later to check the same set of 1490 // properties, and will exit the VM with the correct error message if the unsupported properties 1491 // are used. 1492 return false; 1493 } 1494 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1495 if (get_property(unsupported_properties[i]) != NULL) { 1496 if (RequireSharedSpaces) { 1497 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1498 } 1499 return true; 1500 } 1501 } 1502 return false; 1503 } 1504 #endif 1505 1506 //=========================================================================================================== 1507 // Setting int/mixed/comp mode flags 1508 1509 void Arguments::set_mode_flags(Mode mode) { 1510 // Set up default values for all flags. 1511 // If you add a flag to any of the branches below, 1512 // add a default value for it here. 1513 set_java_compiler(false); 1514 _mode = mode; 1515 1516 // Ensure Agent_OnLoad has the correct initial values. 1517 // This may not be the final mode; mode may change later in onload phase. 1518 PropertyList_unique_add(&_system_properties, "java.vm.info", 1519 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1520 1521 UseInterpreter = true; 1522 UseCompiler = true; 1523 UseLoopCounter = true; 1524 1525 // Default values may be platform/compiler dependent - 1526 // use the saved values 1527 ClipInlining = Arguments::_ClipInlining; 1528 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1529 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1530 BackgroundCompilation = Arguments::_BackgroundCompilation; 1531 if (TieredCompilation) { 1532 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1533 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1534 } 1535 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1536 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1537 } 1538 } 1539 1540 // Change from defaults based on mode 1541 switch (mode) { 1542 default: 1543 ShouldNotReachHere(); 1544 break; 1545 case _int: 1546 UseCompiler = false; 1547 UseLoopCounter = false; 1548 AlwaysCompileLoopMethods = false; 1549 UseOnStackReplacement = false; 1550 break; 1551 case _mixed: 1552 // same as default 1553 break; 1554 case _comp: 1555 UseInterpreter = false; 1556 BackgroundCompilation = false; 1557 ClipInlining = false; 1558 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1559 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1560 // compile a level 4 (C2) and then continue executing it. 1561 if (TieredCompilation) { 1562 Tier3InvokeNotifyFreqLog = 0; 1563 Tier4InvocationThreshold = 0; 1564 } 1565 break; 1566 } 1567 } 1568 1569 // Conflict: required to use shared spaces (-Xshare:on), but 1570 // incompatible command line options were chosen. 1571 static void no_shared_spaces(const char* message) { 1572 if (RequireSharedSpaces) { 1573 jio_fprintf(defaultStream::error_stream(), 1574 "Class data sharing is inconsistent with other specified options.\n"); 1575 vm_exit_during_initialization("Unable to use shared archive", message); 1576 } else { 1577 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1578 } 1579 } 1580 1581 void set_object_alignment() { 1582 // Object alignment. 1583 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1584 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1585 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1586 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1587 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1588 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1589 1590 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1591 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1592 1593 // Oop encoding heap max 1594 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1595 1596 if (SurvivorAlignmentInBytes == 0) { 1597 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1598 } 1599 } 1600 1601 size_t Arguments::max_heap_for_compressed_oops() { 1602 // Avoid sign flip. 1603 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1604 // We need to fit both the NULL page and the heap into the memory budget, while 1605 // keeping alignment constraints of the heap. To guarantee the latter, as the 1606 // NULL page is located before the heap, we pad the NULL page to the conservative 1607 // maximum alignment that the GC may ever impose upon the heap. 1608 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1609 _conservative_max_heap_alignment); 1610 1611 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1612 NOT_LP64(ShouldNotReachHere(); return 0); 1613 } 1614 1615 void Arguments::set_use_compressed_oops() { 1616 #ifndef ZERO 1617 #ifdef _LP64 1618 // MaxHeapSize is not set up properly at this point, but 1619 // the only value that can override MaxHeapSize if we are 1620 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1621 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1622 1623 if (max_heap_size <= max_heap_for_compressed_oops()) { 1624 #if !defined(COMPILER1) || defined(TIERED) 1625 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1626 FLAG_SET_ERGO(UseCompressedOops, true); 1627 } 1628 #endif 1629 } else { 1630 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1631 warning("Max heap size too large for Compressed Oops"); 1632 FLAG_SET_DEFAULT(UseCompressedOops, false); 1633 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1634 } 1635 } 1636 #endif // _LP64 1637 #endif // ZERO 1638 } 1639 1640 1641 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1642 // set_use_compressed_oops(). 1643 void Arguments::set_use_compressed_klass_ptrs() { 1644 #ifndef ZERO 1645 #ifdef _LP64 1646 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1647 if (!UseCompressedOops) { 1648 if (UseCompressedClassPointers) { 1649 warning("UseCompressedClassPointers requires UseCompressedOops"); 1650 } 1651 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1652 } else { 1653 // Turn on UseCompressedClassPointers too 1654 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1655 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1656 } 1657 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1658 if (UseCompressedClassPointers) { 1659 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1660 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1661 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1662 } 1663 } 1664 } 1665 #endif // _LP64 1666 #endif // !ZERO 1667 } 1668 1669 void Arguments::set_conservative_max_heap_alignment() { 1670 // The conservative maximum required alignment for the heap is the maximum of 1671 // the alignments imposed by several sources: any requirements from the heap 1672 // itself and the maximum page size we may run the VM with. 1673 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1674 _conservative_max_heap_alignment = MAX4(heap_alignment, 1675 (size_t)os::vm_allocation_granularity(), 1676 os::max_page_size(), 1677 GCArguments::compute_heap_alignment()); 1678 } 1679 1680 jint Arguments::set_ergonomics_flags() { 1681 GCConfig::initialize(); 1682 1683 set_conservative_max_heap_alignment(); 1684 1685 #ifndef ZERO 1686 #ifdef _LP64 1687 set_use_compressed_oops(); 1688 1689 // set_use_compressed_klass_ptrs() must be called after calling 1690 // set_use_compressed_oops(). 1691 set_use_compressed_klass_ptrs(); 1692 1693 // Also checks that certain machines are slower with compressed oops 1694 // in vm_version initialization code. 1695 #endif // _LP64 1696 #endif // !ZERO 1697 1698 return JNI_OK; 1699 } 1700 1701 julong Arguments::limit_by_allocatable_memory(julong limit) { 1702 julong max_allocatable; 1703 julong result = limit; 1704 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1705 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1706 } 1707 return result; 1708 } 1709 1710 // Use static initialization to get the default before parsing 1711 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1712 1713 void Arguments::set_heap_size() { 1714 julong phys_mem; 1715 1716 // If the user specified one of these options, they 1717 // want specific memory sizing so do not limit memory 1718 // based on compressed oops addressability. 1719 // Also, memory limits will be calculated based on 1720 // available os physical memory, not our MaxRAM limit, 1721 // unless MaxRAM is also specified. 1722 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1723 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1724 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1725 !FLAG_IS_DEFAULT(MinRAMFraction) || 1726 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1727 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1728 !FLAG_IS_DEFAULT(MaxRAM)); 1729 if (override_coop_limit) { 1730 if (FLAG_IS_DEFAULT(MaxRAM)) { 1731 phys_mem = os::physical_memory(); 1732 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1733 } else { 1734 phys_mem = (julong)MaxRAM; 1735 } 1736 } else { 1737 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1738 : (julong)MaxRAM; 1739 } 1740 1741 1742 // Convert deprecated flags 1743 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1744 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1745 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1746 1747 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1748 !FLAG_IS_DEFAULT(MinRAMFraction)) 1749 MinRAMPercentage = 100.0 / MinRAMFraction; 1750 1751 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1752 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1753 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1754 1755 // If the maximum heap size has not been set with -Xmx, 1756 // then set it as fraction of the size of physical memory, 1757 // respecting the maximum and minimum sizes of the heap. 1758 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1759 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1760 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1761 if (reasonable_min < MaxHeapSize) { 1762 // Small physical memory, so use a minimum fraction of it for the heap 1763 reasonable_max = reasonable_min; 1764 } else { 1765 // Not-small physical memory, so require a heap at least 1766 // as large as MaxHeapSize 1767 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1768 } 1769 1770 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1771 // Limit the heap size to ErgoHeapSizeLimit 1772 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1773 } 1774 1775 #ifdef _LP64 1776 if (UseCompressedOops) { 1777 // Limit the heap size to the maximum possible when using compressed oops 1778 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1779 1780 // HeapBaseMinAddress can be greater than default but not less than. 1781 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1782 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1783 // matches compressed oops printing flags 1784 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1785 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1786 DefaultHeapBaseMinAddress, 1787 DefaultHeapBaseMinAddress/G, 1788 HeapBaseMinAddress); 1789 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1790 } 1791 } 1792 1793 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1794 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1795 // but it should be not less than default MaxHeapSize. 1796 max_coop_heap -= HeapBaseMinAddress; 1797 } 1798 1799 // If user specified flags prioritizing os physical 1800 // memory limits, then disable compressed oops if 1801 // limits exceed max_coop_heap and UseCompressedOops 1802 // was not specified. 1803 if (reasonable_max > max_coop_heap) { 1804 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1805 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1806 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1807 "Please check the setting of MaxRAMPercentage %5.2f." 1808 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1809 FLAG_SET_ERGO(UseCompressedOops, false); 1810 FLAG_SET_ERGO(UseCompressedClassPointers, false); 1811 } else { 1812 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1813 } 1814 } 1815 } 1816 #endif // _LP64 1817 1818 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1819 1820 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1821 // An initial heap size was specified on the command line, 1822 // so be sure that the maximum size is consistent. Done 1823 // after call to limit_by_allocatable_memory because that 1824 // method might reduce the allocation size. 1825 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1826 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1827 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1828 } 1829 1830 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1831 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1832 } 1833 1834 // If the minimum or initial heap_size have not been set or requested to be set 1835 // ergonomically, set them accordingly. 1836 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1837 julong reasonable_minimum = (julong)(OldSize + NewSize); 1838 1839 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1840 1841 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1842 1843 if (InitialHeapSize == 0) { 1844 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1845 1846 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1847 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1848 1849 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1850 1851 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1852 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1853 } 1854 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1855 // synchronize with InitialHeapSize to avoid errors with the default value. 1856 if (MinHeapSize == 0) { 1857 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1858 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1859 } 1860 } 1861 } 1862 1863 // This option inspects the machine and attempts to set various 1864 // parameters to be optimal for long-running, memory allocation 1865 // intensive jobs. It is intended for machines with large 1866 // amounts of cpu and memory. 1867 jint Arguments::set_aggressive_heap_flags() { 1868 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1869 // VM, but we may not be able to represent the total physical memory 1870 // available (like having 8gb of memory on a box but using a 32bit VM). 1871 // Thus, we need to make sure we're using a julong for intermediate 1872 // calculations. 1873 julong initHeapSize; 1874 julong total_memory = os::physical_memory(); 1875 1876 if (total_memory < (julong) 256 * M) { 1877 jio_fprintf(defaultStream::error_stream(), 1878 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1879 vm_exit(1); 1880 } 1881 1882 // The heap size is half of available memory, or (at most) 1883 // all of possible memory less 160mb (leaving room for the OS 1884 // when using ISM). This is the maximum; because adaptive sizing 1885 // is turned on below, the actual space used may be smaller. 1886 1887 initHeapSize = MIN2(total_memory / (julong) 2, 1888 total_memory - (julong) 160 * M); 1889 1890 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1891 1892 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1893 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1894 return JNI_EINVAL; 1895 } 1896 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1897 return JNI_EINVAL; 1898 } 1899 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1900 return JNI_EINVAL; 1901 } 1902 } 1903 if (FLAG_IS_DEFAULT(NewSize)) { 1904 // Make the young generation 3/8ths of the total heap. 1905 if (FLAG_SET_CMDLINE(NewSize, 1906 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1907 return JNI_EINVAL; 1908 } 1909 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1910 return JNI_EINVAL; 1911 } 1912 } 1913 1914 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1915 FLAG_SET_DEFAULT(UseLargePages, true); 1916 #endif 1917 1918 // Increase some data structure sizes for efficiency 1919 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1920 return JNI_EINVAL; 1921 } 1922 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1923 return JNI_EINVAL; 1924 } 1925 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1926 return JNI_EINVAL; 1927 } 1928 1929 // See the OldPLABSize comment below, but replace 'after promotion' 1930 // with 'after copying'. YoungPLABSize is the size of the survivor 1931 // space per-gc-thread buffers. The default is 4kw. 1932 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1933 return JNI_EINVAL; 1934 } 1935 1936 // OldPLABSize is the size of the buffers in the old gen that 1937 // UseParallelGC uses to promote live data that doesn't fit in the 1938 // survivor spaces. At any given time, there's one for each gc thread. 1939 // The default size is 1kw. These buffers are rarely used, since the 1940 // survivor spaces are usually big enough. For specjbb, however, there 1941 // are occasions when there's lots of live data in the young gen 1942 // and we end up promoting some of it. We don't have a definite 1943 // explanation for why bumping OldPLABSize helps, but the theory 1944 // is that a bigger PLAB results in retaining something like the 1945 // original allocation order after promotion, which improves mutator 1946 // locality. A minor effect may be that larger PLABs reduce the 1947 // number of PLAB allocation events during gc. The value of 8kw 1948 // was arrived at by experimenting with specjbb. 1949 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1950 return JNI_EINVAL; 1951 } 1952 1953 // Enable parallel GC and adaptive generation sizing 1954 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1955 return JNI_EINVAL; 1956 } 1957 1958 // Encourage steady state memory management 1959 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1960 return JNI_EINVAL; 1961 } 1962 1963 // This appears to improve mutator locality 1964 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1965 return JNI_EINVAL; 1966 } 1967 1968 return JNI_OK; 1969 } 1970 1971 // This must be called after ergonomics. 1972 void Arguments::set_bytecode_flags() { 1973 if (!RewriteBytecodes) { 1974 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1975 } 1976 } 1977 1978 // Aggressive optimization flags 1979 jint Arguments::set_aggressive_opts_flags() { 1980 #ifdef COMPILER2 1981 if (AggressiveUnboxing) { 1982 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1983 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1984 } else if (!EliminateAutoBox) { 1985 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1986 AggressiveUnboxing = false; 1987 } 1988 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1989 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1990 } else if (!DoEscapeAnalysis) { 1991 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1992 AggressiveUnboxing = false; 1993 } 1994 } 1995 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1996 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1997 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1998 } 1999 // Feed the cache size setting into the JDK 2000 char buffer[1024]; 2001 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2002 if (!add_property(buffer)) { 2003 return JNI_ENOMEM; 2004 } 2005 } 2006 #endif 2007 2008 return JNI_OK; 2009 } 2010 2011 //=========================================================================================================== 2012 // Parsing of java.compiler property 2013 2014 void Arguments::process_java_compiler_argument(const char* arg) { 2015 // For backwards compatibility, Djava.compiler=NONE or "" 2016 // causes us to switch to -Xint mode UNLESS -Xdebug 2017 // is also specified. 2018 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2019 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2020 } 2021 } 2022 2023 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2024 _sun_java_launcher = os::strdup_check_oom(launcher); 2025 } 2026 2027 bool Arguments::created_by_java_launcher() { 2028 assert(_sun_java_launcher != NULL, "property must have value"); 2029 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2030 } 2031 2032 bool Arguments::sun_java_launcher_is_altjvm() { 2033 return _sun_java_launcher_is_altjvm; 2034 } 2035 2036 //=========================================================================================================== 2037 // Parsing of main arguments 2038 2039 unsigned int addreads_count = 0; 2040 unsigned int addexports_count = 0; 2041 unsigned int addopens_count = 0; 2042 unsigned int addmods_count = 0; 2043 unsigned int patch_mod_count = 0; 2044 2045 // Check the consistency of vm_init_args 2046 bool Arguments::check_vm_args_consistency() { 2047 // Method for adding checks for flag consistency. 2048 // The intent is to warn the user of all possible conflicts, 2049 // before returning an error. 2050 // Note: Needs platform-dependent factoring. 2051 bool status = true; 2052 2053 if (TLABRefillWasteFraction == 0) { 2054 jio_fprintf(defaultStream::error_stream(), 2055 "TLABRefillWasteFraction should be a denominator, " 2056 "not " SIZE_FORMAT "\n", 2057 TLABRefillWasteFraction); 2058 status = false; 2059 } 2060 2061 if (PrintNMTStatistics) { 2062 #if INCLUDE_NMT 2063 if (MemTracker::tracking_level() == NMT_off) { 2064 #endif // INCLUDE_NMT 2065 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2066 PrintNMTStatistics = false; 2067 #if INCLUDE_NMT 2068 } 2069 #endif 2070 } 2071 2072 status = CompilerConfig::check_args_consistency(status); 2073 #if INCLUDE_JVMCI 2074 if (status && EnableJVMCI) { 2075 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2076 AddProperty, UnwriteableProperty, InternalProperty); 2077 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2078 return false; 2079 } 2080 } 2081 #endif 2082 2083 #ifndef SUPPORT_RESERVED_STACK_AREA 2084 if (StackReservedPages != 0) { 2085 FLAG_SET_CMDLINE(StackReservedPages, 0); 2086 warning("Reserved Stack Area not supported on this platform"); 2087 } 2088 #endif 2089 2090 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2091 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2092 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2093 } 2094 } 2095 2096 status = status && GCArguments::check_args_consistency(); 2097 2098 return status; 2099 } 2100 2101 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2102 const char* option_type) { 2103 if (ignore) return false; 2104 2105 const char* spacer = " "; 2106 if (option_type == NULL) { 2107 option_type = ++spacer; // Set both to the empty string. 2108 } 2109 2110 jio_fprintf(defaultStream::error_stream(), 2111 "Unrecognized %s%soption: %s\n", option_type, spacer, 2112 option->optionString); 2113 return true; 2114 } 2115 2116 static const char* user_assertion_options[] = { 2117 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2118 }; 2119 2120 static const char* system_assertion_options[] = { 2121 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2122 }; 2123 2124 bool Arguments::parse_uintx(const char* value, 2125 uintx* uintx_arg, 2126 uintx min_size) { 2127 2128 // Check the sign first since atojulong() parses only unsigned values. 2129 bool value_is_positive = !(*value == '-'); 2130 2131 if (value_is_positive) { 2132 julong n; 2133 bool good_return = atojulong(value, &n); 2134 if (good_return) { 2135 bool above_minimum = n >= min_size; 2136 bool value_is_too_large = n > max_uintx; 2137 2138 if (above_minimum && !value_is_too_large) { 2139 *uintx_arg = n; 2140 return true; 2141 } 2142 } 2143 } 2144 return false; 2145 } 2146 2147 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2148 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2149 char* property = AllocateHeap(prop_len, mtArguments); 2150 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2151 if (ret < 0 || ret >= (int)prop_len) { 2152 FreeHeap(property); 2153 return false; 2154 } 2155 bool added = add_property(property, UnwriteableProperty, internal); 2156 FreeHeap(property); 2157 return added; 2158 } 2159 2160 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2161 const unsigned int props_count_limit = 1000; 2162 const int max_digits = 3; 2163 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2164 2165 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2166 if (count < props_count_limit) { 2167 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2168 char* property = AllocateHeap(prop_len, mtArguments); 2169 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2170 if (ret < 0 || ret >= (int)prop_len) { 2171 FreeHeap(property); 2172 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2173 return false; 2174 } 2175 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2176 FreeHeap(property); 2177 return added; 2178 } 2179 2180 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2181 return false; 2182 } 2183 2184 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2185 julong* long_arg, 2186 julong min_size, 2187 julong max_size) { 2188 if (!atojulong(s, long_arg)) return arg_unreadable; 2189 return check_memory_size(*long_arg, min_size, max_size); 2190 } 2191 2192 // Parse JavaVMInitArgs structure 2193 2194 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2195 const JavaVMInitArgs *java_options_args, 2196 const JavaVMInitArgs *cmd_line_args) { 2197 bool patch_mod_javabase = false; 2198 2199 // Save default settings for some mode flags 2200 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2201 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2202 Arguments::_ClipInlining = ClipInlining; 2203 Arguments::_BackgroundCompilation = BackgroundCompilation; 2204 if (TieredCompilation) { 2205 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2206 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2207 } 2208 2209 // Setup flags for mixed which is the default 2210 set_mode_flags(_mixed); 2211 2212 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2213 // variable (if present). 2214 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2215 if (result != JNI_OK) { 2216 return result; 2217 } 2218 2219 // Parse args structure generated from the command line flags. 2220 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE); 2221 if (result != JNI_OK) { 2222 return result; 2223 } 2224 2225 // Parse args structure generated from the _JAVA_OPTIONS environment 2226 // variable (if present) (mimics classic VM) 2227 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2228 if (result != JNI_OK) { 2229 return result; 2230 } 2231 2232 // We need to ensure processor and memory resources have been properly 2233 // configured - which may rely on arguments we just processed - before 2234 // doing the final argument processing. Any argument processing that 2235 // needs to know about processor and memory resources must occur after 2236 // this point. 2237 2238 os::init_container_support(); 2239 2240 // Do final processing now that all arguments have been parsed 2241 result = finalize_vm_init_args(patch_mod_javabase); 2242 if (result != JNI_OK) { 2243 return result; 2244 } 2245 2246 return JNI_OK; 2247 } 2248 2249 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2250 // represents a valid JDWP agent. is_path==true denotes that we 2251 // are dealing with -agentpath (case where name is a path), otherwise with 2252 // -agentlib 2253 bool valid_jdwp_agent(char *name, bool is_path) { 2254 char *_name; 2255 const char *_jdwp = "jdwp"; 2256 size_t _len_jdwp, _len_prefix; 2257 2258 if (is_path) { 2259 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2260 return false; 2261 } 2262 2263 _name++; // skip past last path separator 2264 _len_prefix = strlen(JNI_LIB_PREFIX); 2265 2266 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2267 return false; 2268 } 2269 2270 _name += _len_prefix; 2271 _len_jdwp = strlen(_jdwp); 2272 2273 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2274 _name += _len_jdwp; 2275 } 2276 else { 2277 return false; 2278 } 2279 2280 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2281 return false; 2282 } 2283 2284 return true; 2285 } 2286 2287 if (strcmp(name, _jdwp) == 0) { 2288 return true; 2289 } 2290 2291 return false; 2292 } 2293 2294 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2295 // --patch-module=<module>=<file>(<pathsep><file>)* 2296 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2297 // Find the equal sign between the module name and the path specification 2298 const char* module_equal = strchr(patch_mod_tail, '='); 2299 if (module_equal == NULL) { 2300 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2301 return JNI_ERR; 2302 } else { 2303 // Pick out the module name 2304 size_t module_len = module_equal - patch_mod_tail; 2305 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2306 if (module_name != NULL) { 2307 memcpy(module_name, patch_mod_tail, module_len); 2308 *(module_name + module_len) = '\0'; 2309 // The path piece begins one past the module_equal sign 2310 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2311 FREE_C_HEAP_ARRAY(char, module_name); 2312 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2313 return JNI_ENOMEM; 2314 } 2315 } else { 2316 return JNI_ENOMEM; 2317 } 2318 } 2319 return JNI_OK; 2320 } 2321 2322 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2323 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2324 // The min and max sizes match the values in globals.hpp, but scaled 2325 // with K. The values have been chosen so that alignment with page 2326 // size doesn't change the max value, which makes the conversions 2327 // back and forth between Xss value and ThreadStackSize value easier. 2328 // The values have also been chosen to fit inside a 32-bit signed type. 2329 const julong min_ThreadStackSize = 0; 2330 const julong max_ThreadStackSize = 1 * M; 2331 2332 const julong min_size = min_ThreadStackSize * K; 2333 const julong max_size = max_ThreadStackSize * K; 2334 2335 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2336 2337 julong size = 0; 2338 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2339 if (errcode != arg_in_range) { 2340 bool silent = (option == NULL); // Allow testing to silence error messages 2341 if (!silent) { 2342 jio_fprintf(defaultStream::error_stream(), 2343 "Invalid thread stack size: %s\n", option->optionString); 2344 describe_range_error(errcode); 2345 } 2346 return JNI_EINVAL; 2347 } 2348 2349 // Internally track ThreadStackSize in units of 1024 bytes. 2350 const julong size_aligned = align_up(size, K); 2351 assert(size <= size_aligned, 2352 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2353 size, size_aligned); 2354 2355 const julong size_in_K = size_aligned / K; 2356 assert(size_in_K < (julong)max_intx, 2357 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2358 size_in_K); 2359 2360 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2361 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2362 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2363 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2364 max_expanded, size_in_K); 2365 2366 *out_ThreadStackSize = (intx)size_in_K; 2367 2368 return JNI_OK; 2369 } 2370 2371 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) { 2372 // For match_option to return remaining or value part of option string 2373 const char* tail; 2374 2375 // iterate over arguments 2376 for (int index = 0; index < args->nOptions; index++) { 2377 bool is_absolute_path = false; // for -agentpath vs -agentlib 2378 2379 const JavaVMOption* option = args->options + index; 2380 2381 if (!match_option(option, "-Djava.class.path", &tail) && 2382 !match_option(option, "-Dsun.java.command", &tail) && 2383 !match_option(option, "-Dsun.java.launcher", &tail)) { 2384 2385 // add all jvm options to the jvm_args string. This string 2386 // is used later to set the java.vm.args PerfData string constant. 2387 // the -Djava.class.path and the -Dsun.java.command options are 2388 // omitted from jvm_args string as each have their own PerfData 2389 // string constant object. 2390 build_jvm_args(option->optionString); 2391 } 2392 2393 // -verbose:[class/module/gc/jni] 2394 if (match_option(option, "-verbose", &tail)) { 2395 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2396 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2397 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2398 } else if (!strcmp(tail, ":module")) { 2399 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2400 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2401 } else if (!strcmp(tail, ":gc")) { 2402 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2403 } else if (!strcmp(tail, ":jni")) { 2404 if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) { 2405 return JNI_EINVAL; 2406 } 2407 } 2408 // -da / -ea / -disableassertions / -enableassertions 2409 // These accept an optional class/package name separated by a colon, e.g., 2410 // -da:java.lang.Thread. 2411 } else if (match_option(option, user_assertion_options, &tail, true)) { 2412 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2413 if (*tail == '\0') { 2414 JavaAssertions::setUserClassDefault(enable); 2415 } else { 2416 assert(*tail == ':', "bogus match by match_option()"); 2417 JavaAssertions::addOption(tail + 1, enable); 2418 } 2419 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2420 } else if (match_option(option, system_assertion_options, &tail, false)) { 2421 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2422 JavaAssertions::setSystemClassDefault(enable); 2423 // -bootclasspath: 2424 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2425 jio_fprintf(defaultStream::output_stream(), 2426 "-Xbootclasspath is no longer a supported option.\n"); 2427 return JNI_EINVAL; 2428 // -bootclasspath/a: 2429 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2430 Arguments::append_sysclasspath(tail); 2431 // -bootclasspath/p: 2432 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2433 jio_fprintf(defaultStream::output_stream(), 2434 "-Xbootclasspath/p is no longer a supported option.\n"); 2435 return JNI_EINVAL; 2436 // -Xrun 2437 } else if (match_option(option, "-Xrun", &tail)) { 2438 if (tail != NULL) { 2439 const char* pos = strchr(tail, ':'); 2440 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2441 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2442 jio_snprintf(name, len + 1, "%s", tail); 2443 2444 char *options = NULL; 2445 if(pos != NULL) { 2446 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2447 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2448 } 2449 #if !INCLUDE_JVMTI 2450 if (strcmp(name, "jdwp") == 0) { 2451 jio_fprintf(defaultStream::error_stream(), 2452 "Debugging agents are not supported in this VM\n"); 2453 return JNI_ERR; 2454 } 2455 #endif // !INCLUDE_JVMTI 2456 add_init_library(name, options); 2457 } 2458 } else if (match_option(option, "--add-reads=", &tail)) { 2459 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2460 return JNI_ENOMEM; 2461 } 2462 } else if (match_option(option, "--add-exports=", &tail)) { 2463 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2464 return JNI_ENOMEM; 2465 } 2466 } else if (match_option(option, "--add-opens=", &tail)) { 2467 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2468 return JNI_ENOMEM; 2469 } 2470 } else if (match_option(option, "--add-modules=", &tail)) { 2471 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2472 return JNI_ENOMEM; 2473 } 2474 } else if (match_option(option, "--limit-modules=", &tail)) { 2475 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2476 return JNI_ENOMEM; 2477 } 2478 } else if (match_option(option, "--module-path=", &tail)) { 2479 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2480 return JNI_ENOMEM; 2481 } 2482 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2483 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2484 return JNI_ENOMEM; 2485 } 2486 } else if (match_option(option, "--patch-module=", &tail)) { 2487 // --patch-module=<module>=<file>(<pathsep><file>)* 2488 int res = process_patch_mod_option(tail, patch_mod_javabase); 2489 if (res != JNI_OK) { 2490 return res; 2491 } 2492 } else if (match_option(option, "--illegal-access=", &tail)) { 2493 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2494 return JNI_ENOMEM; 2495 } 2496 // -agentlib and -agentpath 2497 } else if (match_option(option, "-agentlib:", &tail) || 2498 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2499 if(tail != NULL) { 2500 const char* pos = strchr(tail, '='); 2501 char* name; 2502 if (pos == NULL) { 2503 name = os::strdup_check_oom(tail, mtArguments); 2504 } else { 2505 size_t len = pos - tail; 2506 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2507 memcpy(name, tail, len); 2508 name[len] = '\0'; 2509 } 2510 2511 char *options = NULL; 2512 if(pos != NULL) { 2513 options = os::strdup_check_oom(pos + 1, mtArguments); 2514 } 2515 #if !INCLUDE_JVMTI 2516 if (valid_jdwp_agent(name, is_absolute_path)) { 2517 jio_fprintf(defaultStream::error_stream(), 2518 "Debugging agents are not supported in this VM\n"); 2519 return JNI_ERR; 2520 } 2521 #endif // !INCLUDE_JVMTI 2522 add_init_agent(name, options, is_absolute_path); 2523 } 2524 // -javaagent 2525 } else if (match_option(option, "-javaagent:", &tail)) { 2526 #if !INCLUDE_JVMTI 2527 jio_fprintf(defaultStream::error_stream(), 2528 "Instrumentation agents are not supported in this VM\n"); 2529 return JNI_ERR; 2530 #else 2531 if (tail != NULL) { 2532 size_t length = strlen(tail) + 1; 2533 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2534 jio_snprintf(options, length, "%s", tail); 2535 add_instrument_agent("instrument", options, false); 2536 // java agents need module java.instrument 2537 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2538 return JNI_ENOMEM; 2539 } 2540 } 2541 #endif // !INCLUDE_JVMTI 2542 // --enable_preview 2543 } else if (match_option(option, "--enable-preview")) { 2544 set_enable_preview(); 2545 // -Xnoclassgc 2546 } else if (match_option(option, "-Xnoclassgc")) { 2547 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2548 return JNI_EINVAL; 2549 } 2550 // -Xconcgc 2551 } else if (match_option(option, "-Xconcgc")) { 2552 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) { 2553 return JNI_EINVAL; 2554 } 2555 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2556 // -Xnoconcgc 2557 } else if (match_option(option, "-Xnoconcgc")) { 2558 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) { 2559 return JNI_EINVAL; 2560 } 2561 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2562 // -Xbatch 2563 } else if (match_option(option, "-Xbatch")) { 2564 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2565 return JNI_EINVAL; 2566 } 2567 // -Xmn for compatibility with other JVM vendors 2568 } else if (match_option(option, "-Xmn", &tail)) { 2569 julong long_initial_young_size = 0; 2570 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2571 if (errcode != arg_in_range) { 2572 jio_fprintf(defaultStream::error_stream(), 2573 "Invalid initial young generation size: %s\n", option->optionString); 2574 describe_range_error(errcode); 2575 return JNI_EINVAL; 2576 } 2577 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2578 return JNI_EINVAL; 2579 } 2580 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2581 return JNI_EINVAL; 2582 } 2583 // -Xms 2584 } else if (match_option(option, "-Xms", &tail)) { 2585 julong size = 0; 2586 // an initial heap size of 0 means automatically determine 2587 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2588 if (errcode != arg_in_range) { 2589 jio_fprintf(defaultStream::error_stream(), 2590 "Invalid initial heap size: %s\n", option->optionString); 2591 describe_range_error(errcode); 2592 return JNI_EINVAL; 2593 } 2594 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2595 return JNI_EINVAL; 2596 } 2597 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2598 return JNI_EINVAL; 2599 } 2600 // -Xmx 2601 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2602 julong long_max_heap_size = 0; 2603 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2604 if (errcode != arg_in_range) { 2605 jio_fprintf(defaultStream::error_stream(), 2606 "Invalid maximum heap size: %s\n", option->optionString); 2607 describe_range_error(errcode); 2608 return JNI_EINVAL; 2609 } 2610 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2611 return JNI_EINVAL; 2612 } 2613 // Xmaxf 2614 } else if (match_option(option, "-Xmaxf", &tail)) { 2615 char* err; 2616 int maxf = (int)(strtod(tail, &err) * 100); 2617 if (*err != '\0' || *tail == '\0') { 2618 jio_fprintf(defaultStream::error_stream(), 2619 "Bad max heap free percentage size: %s\n", 2620 option->optionString); 2621 return JNI_EINVAL; 2622 } else { 2623 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2624 return JNI_EINVAL; 2625 } 2626 } 2627 // Xminf 2628 } else if (match_option(option, "-Xminf", &tail)) { 2629 char* err; 2630 int minf = (int)(strtod(tail, &err) * 100); 2631 if (*err != '\0' || *tail == '\0') { 2632 jio_fprintf(defaultStream::error_stream(), 2633 "Bad min heap free percentage size: %s\n", 2634 option->optionString); 2635 return JNI_EINVAL; 2636 } else { 2637 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2638 return JNI_EINVAL; 2639 } 2640 } 2641 // -Xss 2642 } else if (match_option(option, "-Xss", &tail)) { 2643 intx value = 0; 2644 jint err = parse_xss(option, tail, &value); 2645 if (err != JNI_OK) { 2646 return err; 2647 } 2648 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2649 return JNI_EINVAL; 2650 } 2651 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2652 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2653 julong long_ReservedCodeCacheSize = 0; 2654 2655 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2656 if (errcode != arg_in_range) { 2657 jio_fprintf(defaultStream::error_stream(), 2658 "Invalid maximum code cache size: %s.\n", option->optionString); 2659 return JNI_EINVAL; 2660 } 2661 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2662 return JNI_EINVAL; 2663 } 2664 // -green 2665 } else if (match_option(option, "-green")) { 2666 jio_fprintf(defaultStream::error_stream(), 2667 "Green threads support not available\n"); 2668 return JNI_EINVAL; 2669 // -native 2670 } else if (match_option(option, "-native")) { 2671 // HotSpot always uses native threads, ignore silently for compatibility 2672 // -Xrs 2673 } else if (match_option(option, "-Xrs")) { 2674 // Classic/EVM option, new functionality 2675 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2676 return JNI_EINVAL; 2677 } 2678 // -Xprof 2679 } else if (match_option(option, "-Xprof")) { 2680 char version[256]; 2681 // Obsolete in JDK 10 2682 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2683 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2684 // -Xinternalversion 2685 } else if (match_option(option, "-Xinternalversion")) { 2686 jio_fprintf(defaultStream::output_stream(), "%s\n", 2687 VM_Version::internal_vm_info_string()); 2688 vm_exit(0); 2689 #ifndef PRODUCT 2690 // -Xprintflags 2691 } else if (match_option(option, "-Xprintflags")) { 2692 JVMFlag::printFlags(tty, false); 2693 vm_exit(0); 2694 #endif 2695 // -D 2696 } else if (match_option(option, "-D", &tail)) { 2697 const char* value; 2698 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2699 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2700 // abort if -Djava.endorsed.dirs is set 2701 jio_fprintf(defaultStream::output_stream(), 2702 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2703 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2704 return JNI_EINVAL; 2705 } 2706 if (match_option(option, "-Djava.ext.dirs=", &value) && 2707 *value != '\0' && strcmp(value, "\"\"") != 0) { 2708 // abort if -Djava.ext.dirs is set 2709 jio_fprintf(defaultStream::output_stream(), 2710 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2711 return JNI_EINVAL; 2712 } 2713 // Check for module related properties. They must be set using the modules 2714 // options. For example: use "--add-modules=java.sql", not 2715 // "-Djdk.module.addmods=java.sql" 2716 if (is_internal_module_property(option->optionString + 2)) { 2717 needs_module_property_warning = true; 2718 continue; 2719 } 2720 2721 if (!add_property(tail)) { 2722 return JNI_ENOMEM; 2723 } 2724 // Out of the box management support 2725 if (match_option(option, "-Dcom.sun.management", &tail)) { 2726 #if INCLUDE_MANAGEMENT 2727 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2728 return JNI_EINVAL; 2729 } 2730 // management agent in module jdk.management.agent 2731 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2732 return JNI_ENOMEM; 2733 } 2734 #else 2735 jio_fprintf(defaultStream::output_stream(), 2736 "-Dcom.sun.management is not supported in this VM.\n"); 2737 return JNI_ERR; 2738 #endif 2739 } 2740 // -Xint 2741 } else if (match_option(option, "-Xint")) { 2742 set_mode_flags(_int); 2743 // -Xmixed 2744 } else if (match_option(option, "-Xmixed")) { 2745 set_mode_flags(_mixed); 2746 // -Xcomp 2747 } else if (match_option(option, "-Xcomp")) { 2748 // for testing the compiler; turn off all flags that inhibit compilation 2749 set_mode_flags(_comp); 2750 // -Xshare:dump 2751 } else if (match_option(option, "-Xshare:dump")) { 2752 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) { 2753 return JNI_EINVAL; 2754 } 2755 // -Xshare:on 2756 } else if (match_option(option, "-Xshare:on")) { 2757 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2758 return JNI_EINVAL; 2759 } 2760 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2761 return JNI_EINVAL; 2762 } 2763 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2764 } else if (match_option(option, "-Xshare:auto")) { 2765 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2766 return JNI_EINVAL; 2767 } 2768 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2769 return JNI_EINVAL; 2770 } 2771 // -Xshare:off 2772 } else if (match_option(option, "-Xshare:off")) { 2773 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) { 2774 return JNI_EINVAL; 2775 } 2776 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2777 return JNI_EINVAL; 2778 } 2779 // -Xverify 2780 } else if (match_option(option, "-Xverify", &tail)) { 2781 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2782 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2783 return JNI_EINVAL; 2784 } 2785 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2786 return JNI_EINVAL; 2787 } 2788 } else if (strcmp(tail, ":remote") == 0) { 2789 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2790 return JNI_EINVAL; 2791 } 2792 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2793 return JNI_EINVAL; 2794 } 2795 } else if (strcmp(tail, ":none") == 0) { 2796 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2797 return JNI_EINVAL; 2798 } 2799 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2800 return JNI_EINVAL; 2801 } 2802 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2803 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2804 return JNI_EINVAL; 2805 } 2806 // -Xdebug 2807 } else if (match_option(option, "-Xdebug")) { 2808 // note this flag has been used, then ignore 2809 set_xdebug_mode(true); 2810 // -Xnoagent 2811 } else if (match_option(option, "-Xnoagent")) { 2812 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2813 } else if (match_option(option, "-Xloggc:", &tail)) { 2814 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2815 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2816 _gc_log_filename = os::strdup_check_oom(tail); 2817 } else if (match_option(option, "-Xlog", &tail)) { 2818 bool ret = false; 2819 if (strcmp(tail, ":help") == 0) { 2820 fileStream stream(defaultStream::output_stream()); 2821 LogConfiguration::print_command_line_help(&stream); 2822 vm_exit(0); 2823 } else if (strcmp(tail, ":disable") == 0) { 2824 LogConfiguration::disable_logging(); 2825 ret = true; 2826 } else if (*tail == '\0') { 2827 ret = LogConfiguration::parse_command_line_arguments(); 2828 assert(ret, "-Xlog without arguments should never fail to parse"); 2829 } else if (*tail == ':') { 2830 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2831 } 2832 if (ret == false) { 2833 jio_fprintf(defaultStream::error_stream(), 2834 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2835 tail); 2836 return JNI_EINVAL; 2837 } 2838 // JNI hooks 2839 } else if (match_option(option, "-Xcheck", &tail)) { 2840 if (!strcmp(tail, ":jni")) { 2841 #if !INCLUDE_JNI_CHECK 2842 warning("JNI CHECKING is not supported in this VM"); 2843 #else 2844 CheckJNICalls = true; 2845 #endif // INCLUDE_JNI_CHECK 2846 } else if (is_bad_option(option, args->ignoreUnrecognized, 2847 "check")) { 2848 return JNI_EINVAL; 2849 } 2850 } else if (match_option(option, "vfprintf")) { 2851 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2852 } else if (match_option(option, "exit")) { 2853 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2854 } else if (match_option(option, "abort")) { 2855 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2856 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2857 // and the last option wins. 2858 } else if (match_option(option, "-XX:+NeverTenure")) { 2859 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2860 return JNI_EINVAL; 2861 } 2862 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2863 return JNI_EINVAL; 2864 } 2865 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2866 return JNI_EINVAL; 2867 } 2868 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2869 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2870 return JNI_EINVAL; 2871 } 2872 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2873 return JNI_EINVAL; 2874 } 2875 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2876 return JNI_EINVAL; 2877 } 2878 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2879 uintx max_tenuring_thresh = 0; 2880 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2881 jio_fprintf(defaultStream::error_stream(), 2882 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2883 return JNI_EINVAL; 2884 } 2885 2886 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2887 return JNI_EINVAL; 2888 } 2889 2890 if (MaxTenuringThreshold == 0) { 2891 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2892 return JNI_EINVAL; 2893 } 2894 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2895 return JNI_EINVAL; 2896 } 2897 } else { 2898 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2899 return JNI_EINVAL; 2900 } 2901 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2902 return JNI_EINVAL; 2903 } 2904 } 2905 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2906 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2907 return JNI_EINVAL; 2908 } 2909 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2910 return JNI_EINVAL; 2911 } 2912 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2913 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2914 return JNI_EINVAL; 2915 } 2916 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2917 return JNI_EINVAL; 2918 } 2919 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2920 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2921 return JNI_EINVAL; 2922 } 2923 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2924 return JNI_EINVAL; 2925 } 2926 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2927 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2928 return JNI_EINVAL; 2929 } 2930 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2931 return JNI_EINVAL; 2932 } 2933 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 2934 #if defined(DTRACE_ENABLED) 2935 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 2936 return JNI_EINVAL; 2937 } 2938 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 2939 return JNI_EINVAL; 2940 } 2941 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 2942 return JNI_EINVAL; 2943 } 2944 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 2945 return JNI_EINVAL; 2946 } 2947 #else // defined(DTRACE_ENABLED) 2948 jio_fprintf(defaultStream::error_stream(), 2949 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2950 return JNI_EINVAL; 2951 #endif // defined(DTRACE_ENABLED) 2952 #ifdef ASSERT 2953 } else if (match_option(option, "-XX:+FullGCALot")) { 2954 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2955 return JNI_EINVAL; 2956 } 2957 // disable scavenge before parallel mark-compact 2958 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2959 return JNI_EINVAL; 2960 } 2961 #endif 2962 #if !INCLUDE_MANAGEMENT 2963 } else if (match_option(option, "-XX:+ManagementServer")) { 2964 jio_fprintf(defaultStream::error_stream(), 2965 "ManagementServer is not supported in this VM.\n"); 2966 return JNI_ERR; 2967 #endif // INCLUDE_MANAGEMENT 2968 #if INCLUDE_JFR 2969 } else if (match_jfr_option(&option)) { 2970 return JNI_EINVAL; 2971 #endif 2972 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2973 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2974 // already been handled 2975 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2976 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2977 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2978 return JNI_EINVAL; 2979 } 2980 } 2981 // Unknown option 2982 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2983 return JNI_ERR; 2984 } 2985 } 2986 2987 // PrintSharedArchiveAndExit will turn on 2988 // -Xshare:on 2989 // -Xlog:class+path=info 2990 if (PrintSharedArchiveAndExit) { 2991 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2992 return JNI_EINVAL; 2993 } 2994 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2995 return JNI_EINVAL; 2996 } 2997 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2998 } 2999 3000 fix_appclasspath(); 3001 3002 return JNI_OK; 3003 } 3004 3005 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3006 // For java.base check for duplicate --patch-module options being specified on the command line. 3007 // This check is only required for java.base, all other duplicate module specifications 3008 // will be checked during module system initialization. The module system initialization 3009 // will throw an ExceptionInInitializerError if this situation occurs. 3010 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3011 if (*patch_mod_javabase) { 3012 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3013 } else { 3014 *patch_mod_javabase = true; 3015 } 3016 } 3017 3018 // Create GrowableArray lazily, only if --patch-module has been specified 3019 if (_patch_mod_prefix == NULL) { 3020 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3021 } 3022 3023 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3024 } 3025 3026 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3027 // 3028 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3029 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3030 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3031 // path is treated as the current directory. 3032 // 3033 // This causes problems with CDS, which requires that all directories specified in the classpath 3034 // must be empty. In most cases, applications do NOT want to load classes from the current 3035 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3036 // scripts compatible with CDS. 3037 void Arguments::fix_appclasspath() { 3038 if (IgnoreEmptyClassPaths) { 3039 const char separator = *os::path_separator(); 3040 const char* src = _java_class_path->value(); 3041 3042 // skip over all the leading empty paths 3043 while (*src == separator) { 3044 src ++; 3045 } 3046 3047 char* copy = os::strdup_check_oom(src, mtArguments); 3048 3049 // trim all trailing empty paths 3050 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3051 *tail = '\0'; 3052 } 3053 3054 char from[3] = {separator, separator, '\0'}; 3055 char to [2] = {separator, '\0'}; 3056 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3057 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3058 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3059 } 3060 3061 _java_class_path->set_writeable_value(copy); 3062 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3063 } 3064 } 3065 3066 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3067 // check if the default lib/endorsed directory exists; if so, error 3068 char path[JVM_MAXPATHLEN]; 3069 const char* fileSep = os::file_separator(); 3070 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3071 3072 DIR* dir = os::opendir(path); 3073 if (dir != NULL) { 3074 jio_fprintf(defaultStream::output_stream(), 3075 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3076 "in modular form will be supported via the concept of upgradeable modules.\n"); 3077 os::closedir(dir); 3078 return JNI_ERR; 3079 } 3080 3081 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3082 dir = os::opendir(path); 3083 if (dir != NULL) { 3084 jio_fprintf(defaultStream::output_stream(), 3085 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3086 "Use -classpath instead.\n."); 3087 os::closedir(dir); 3088 return JNI_ERR; 3089 } 3090 3091 // This must be done after all arguments have been processed 3092 // and the container support has been initialized since AggressiveHeap 3093 // relies on the amount of total memory available. 3094 if (AggressiveHeap) { 3095 jint result = set_aggressive_heap_flags(); 3096 if (result != JNI_OK) { 3097 return result; 3098 } 3099 } 3100 3101 // This must be done after all arguments have been processed. 3102 // java_compiler() true means set to "NONE" or empty. 3103 if (java_compiler() && !xdebug_mode()) { 3104 // For backwards compatibility, we switch to interpreted mode if 3105 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3106 // not specified. 3107 set_mode_flags(_int); 3108 } 3109 3110 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3111 // but like -Xint, leave compilation thresholds unaffected. 3112 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3113 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3114 set_mode_flags(_int); 3115 } 3116 3117 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3118 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3119 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3120 } 3121 3122 #if !COMPILER2_OR_JVMCI 3123 // Don't degrade server performance for footprint 3124 if (FLAG_IS_DEFAULT(UseLargePages) && 3125 MaxHeapSize < LargePageHeapSizeThreshold) { 3126 // No need for large granularity pages w/small heaps. 3127 // Note that large pages are enabled/disabled for both the 3128 // Java heap and the code cache. 3129 FLAG_SET_DEFAULT(UseLargePages, false); 3130 } 3131 3132 UNSUPPORTED_OPTION(ProfileInterpreter); 3133 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3134 #endif 3135 3136 #ifndef TIERED 3137 // Tiered compilation is undefined. 3138 UNSUPPORTED_OPTION(TieredCompilation); 3139 #endif 3140 3141 if (!check_vm_args_consistency()) { 3142 return JNI_ERR; 3143 } 3144 3145 #if INCLUDE_CDS 3146 if (DumpSharedSpaces) { 3147 // Disable biased locking now as it interferes with the clean up of 3148 // the archived Klasses and Java string objects (at dump time only). 3149 UseBiasedLocking = false; 3150 3151 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3152 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable 3153 // compiler just to be safe. 3154 // 3155 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata 3156 // instead of modifying them in place. The copy is inaccessible to the compiler. 3157 // TODO: revisit the following for the static archive case. 3158 set_mode_flags(_int); 3159 } 3160 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) { 3161 // Always verify non-system classes during CDS dump 3162 if (!BytecodeVerificationRemote) { 3163 BytecodeVerificationRemote = true; 3164 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3165 } 3166 } 3167 if (ArchiveClassesAtExit == NULL) { 3168 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false); 3169 } 3170 if (UseSharedSpaces && patch_mod_javabase) { 3171 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3172 } 3173 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3174 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3175 } 3176 #endif 3177 3178 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3179 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3180 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3181 3182 return JNI_OK; 3183 } 3184 3185 // Helper class for controlling the lifetime of JavaVMInitArgs 3186 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3187 // deleted on the destruction of the ScopedVMInitArgs object. 3188 class ScopedVMInitArgs : public StackObj { 3189 private: 3190 JavaVMInitArgs _args; 3191 char* _container_name; 3192 bool _is_set; 3193 char* _vm_options_file_arg; 3194 3195 public: 3196 ScopedVMInitArgs(const char *container_name) { 3197 _args.version = JNI_VERSION_1_2; 3198 _args.nOptions = 0; 3199 _args.options = NULL; 3200 _args.ignoreUnrecognized = false; 3201 _container_name = (char *)container_name; 3202 _is_set = false; 3203 _vm_options_file_arg = NULL; 3204 } 3205 3206 // Populates the JavaVMInitArgs object represented by this 3207 // ScopedVMInitArgs object with the arguments in options. The 3208 // allocated memory is deleted by the destructor. If this method 3209 // returns anything other than JNI_OK, then this object is in a 3210 // partially constructed state, and should be abandoned. 3211 jint set_args(GrowableArray<JavaVMOption>* options) { 3212 _is_set = true; 3213 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3214 JavaVMOption, options->length(), mtArguments); 3215 if (options_arr == NULL) { 3216 return JNI_ENOMEM; 3217 } 3218 _args.options = options_arr; 3219 3220 for (int i = 0; i < options->length(); i++) { 3221 options_arr[i] = options->at(i); 3222 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3223 if (options_arr[i].optionString == NULL) { 3224 // Rely on the destructor to do cleanup. 3225 _args.nOptions = i; 3226 return JNI_ENOMEM; 3227 } 3228 } 3229 3230 _args.nOptions = options->length(); 3231 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3232 return JNI_OK; 3233 } 3234 3235 JavaVMInitArgs* get() { return &_args; } 3236 char* container_name() { return _container_name; } 3237 bool is_set() { return _is_set; } 3238 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3239 char* vm_options_file_arg() { return _vm_options_file_arg; } 3240 3241 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3242 if (_vm_options_file_arg != NULL) { 3243 os::free(_vm_options_file_arg); 3244 } 3245 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3246 } 3247 3248 ~ScopedVMInitArgs() { 3249 if (_vm_options_file_arg != NULL) { 3250 os::free(_vm_options_file_arg); 3251 } 3252 if (_args.options == NULL) return; 3253 for (int i = 0; i < _args.nOptions; i++) { 3254 os::free(_args.options[i].optionString); 3255 } 3256 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3257 } 3258 3259 // Insert options into this option list, to replace option at 3260 // vm_options_file_pos (-XX:VMOptionsFile) 3261 jint insert(const JavaVMInitArgs* args, 3262 const JavaVMInitArgs* args_to_insert, 3263 const int vm_options_file_pos) { 3264 assert(_args.options == NULL, "shouldn't be set yet"); 3265 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3266 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3267 3268 int length = args->nOptions + args_to_insert->nOptions - 1; 3269 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3270 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3271 for (int i = 0; i < args->nOptions; i++) { 3272 if (i == vm_options_file_pos) { 3273 // insert the new options starting at the same place as the 3274 // -XX:VMOptionsFile option 3275 for (int j = 0; j < args_to_insert->nOptions; j++) { 3276 options->push(args_to_insert->options[j]); 3277 } 3278 } else { 3279 options->push(args->options[i]); 3280 } 3281 } 3282 // make into options array 3283 jint result = set_args(options); 3284 delete options; 3285 return result; 3286 } 3287 }; 3288 3289 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3290 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3291 } 3292 3293 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3294 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3295 } 3296 3297 jint Arguments::parse_options_environment_variable(const char* name, 3298 ScopedVMInitArgs* vm_args) { 3299 char *buffer = ::getenv(name); 3300 3301 // Don't check this environment variable if user has special privileges 3302 // (e.g. unix su command). 3303 if (buffer == NULL || os::have_special_privileges()) { 3304 return JNI_OK; 3305 } 3306 3307 if ((buffer = os::strdup(buffer)) == NULL) { 3308 return JNI_ENOMEM; 3309 } 3310 3311 jio_fprintf(defaultStream::error_stream(), 3312 "Picked up %s: %s\n", name, buffer); 3313 3314 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3315 3316 os::free(buffer); 3317 return retcode; 3318 } 3319 3320 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3321 // read file into buffer 3322 int fd = ::open(file_name, O_RDONLY); 3323 if (fd < 0) { 3324 jio_fprintf(defaultStream::error_stream(), 3325 "Could not open options file '%s'\n", 3326 file_name); 3327 return JNI_ERR; 3328 } 3329 3330 struct stat stbuf; 3331 int retcode = os::stat(file_name, &stbuf); 3332 if (retcode != 0) { 3333 jio_fprintf(defaultStream::error_stream(), 3334 "Could not stat options file '%s'\n", 3335 file_name); 3336 os::close(fd); 3337 return JNI_ERR; 3338 } 3339 3340 if (stbuf.st_size == 0) { 3341 // tell caller there is no option data and that is ok 3342 os::close(fd); 3343 return JNI_OK; 3344 } 3345 3346 // '+ 1' for NULL termination even with max bytes 3347 size_t bytes_alloc = stbuf.st_size + 1; 3348 3349 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3350 if (NULL == buf) { 3351 jio_fprintf(defaultStream::error_stream(), 3352 "Could not allocate read buffer for options file parse\n"); 3353 os::close(fd); 3354 return JNI_ENOMEM; 3355 } 3356 3357 memset(buf, 0, bytes_alloc); 3358 3359 // Fill buffer 3360 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc); 3361 os::close(fd); 3362 if (bytes_read < 0) { 3363 FREE_C_HEAP_ARRAY(char, buf); 3364 jio_fprintf(defaultStream::error_stream(), 3365 "Could not read options file '%s'\n", file_name); 3366 return JNI_ERR; 3367 } 3368 3369 if (bytes_read == 0) { 3370 // tell caller there is no option data and that is ok 3371 FREE_C_HEAP_ARRAY(char, buf); 3372 return JNI_OK; 3373 } 3374 3375 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3376 3377 FREE_C_HEAP_ARRAY(char, buf); 3378 return retcode; 3379 } 3380 3381 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3382 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3383 3384 // some pointers to help with parsing 3385 char *buffer_end = buffer + buf_len; 3386 char *opt_hd = buffer; 3387 char *wrt = buffer; 3388 char *rd = buffer; 3389 3390 // parse all options 3391 while (rd < buffer_end) { 3392 // skip leading white space from the input string 3393 while (rd < buffer_end && isspace(*rd)) { 3394 rd++; 3395 } 3396 3397 if (rd >= buffer_end) { 3398 break; 3399 } 3400 3401 // Remember this is where we found the head of the token. 3402 opt_hd = wrt; 3403 3404 // Tokens are strings of non white space characters separated 3405 // by one or more white spaces. 3406 while (rd < buffer_end && !isspace(*rd)) { 3407 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3408 int quote = *rd; // matching quote to look for 3409 rd++; // don't copy open quote 3410 while (rd < buffer_end && *rd != quote) { 3411 // include everything (even spaces) 3412 // up until the close quote 3413 *wrt++ = *rd++; // copy to option string 3414 } 3415 3416 if (rd < buffer_end) { 3417 rd++; // don't copy close quote 3418 } else { 3419 // did not see closing quote 3420 jio_fprintf(defaultStream::error_stream(), 3421 "Unmatched quote in %s\n", name); 3422 delete options; 3423 return JNI_ERR; 3424 } 3425 } else { 3426 *wrt++ = *rd++; // copy to option string 3427 } 3428 } 3429 3430 // steal a white space character and set it to NULL 3431 *wrt++ = '\0'; 3432 // We now have a complete token 3433 3434 JavaVMOption option; 3435 option.optionString = opt_hd; 3436 option.extraInfo = NULL; 3437 3438 options->append(option); // Fill in option 3439 3440 rd++; // Advance to next character 3441 } 3442 3443 // Fill out JavaVMInitArgs structure. 3444 jint status = vm_args->set_args(options); 3445 3446 delete options; 3447 return status; 3448 } 3449 3450 void Arguments::set_shared_spaces_flags() { 3451 if (DumpSharedSpaces) { 3452 if (RequireSharedSpaces) { 3453 warning("Cannot dump shared archive while using shared archive"); 3454 } 3455 UseSharedSpaces = false; 3456 #ifdef _LP64 3457 if (!UseCompressedOops || !UseCompressedClassPointers) { 3458 vm_exit_during_initialization( 3459 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3460 } 3461 } else { 3462 if (!UseCompressedOops || !UseCompressedClassPointers) { 3463 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3464 } 3465 #endif 3466 } 3467 } 3468 3469 #if INCLUDE_CDS 3470 // Sharing support 3471 // Construct the path to the archive 3472 char* Arguments::get_default_shared_archive_path() { 3473 char *default_archive_path; 3474 char jvm_path[JVM_MAXPATHLEN]; 3475 os::jvm_path(jvm_path, sizeof(jvm_path)); 3476 char *end = strrchr(jvm_path, *os::file_separator()); 3477 if (end != NULL) *end = '\0'; 3478 size_t jvm_path_len = strlen(jvm_path); 3479 size_t file_sep_len = strlen(os::file_separator()); 3480 const size_t len = jvm_path_len + file_sep_len + 20; 3481 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3482 if (default_archive_path != NULL) { 3483 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa", 3484 jvm_path, os::file_separator()); 3485 } 3486 return default_archive_path; 3487 } 3488 3489 int Arguments::num_archives(const char* archive_path) { 3490 if (archive_path == NULL) { 3491 return 0; 3492 } 3493 int npaths = 1; 3494 char* p = (char*)archive_path; 3495 while (*p != '\0') { 3496 if (*p == os::path_separator()[0]) { 3497 npaths++; 3498 } 3499 p++; 3500 } 3501 return npaths; 3502 } 3503 3504 void Arguments::extract_shared_archive_paths(const char* archive_path, 3505 char** base_archive_path, 3506 char** top_archive_path) { 3507 char* begin_ptr = (char*)archive_path; 3508 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3509 if (end_ptr == NULL || end_ptr == begin_ptr) { 3510 vm_exit_during_initialization("Base archive was not specified", archive_path); 3511 } 3512 size_t len = end_ptr - begin_ptr; 3513 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3514 strncpy(cur_path, begin_ptr, len); 3515 cur_path[len] = '\0'; 3516 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/); 3517 *base_archive_path = cur_path; 3518 3519 begin_ptr = ++end_ptr; 3520 if (*begin_ptr == '\0') { 3521 vm_exit_during_initialization("Top archive was not specified", archive_path); 3522 } 3523 end_ptr = strchr(begin_ptr, '\0'); 3524 assert(end_ptr != NULL, "sanity"); 3525 len = end_ptr - begin_ptr; 3526 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3527 strncpy(cur_path, begin_ptr, len + 1); 3528 //cur_path[len] = '\0'; 3529 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/); 3530 *top_archive_path = cur_path; 3531 } 3532 3533 bool Arguments::init_shared_archive_paths() { 3534 if (ArchiveClassesAtExit != NULL) { 3535 if (DumpSharedSpaces) { 3536 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3537 } 3538 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) { 3539 return false; 3540 } 3541 check_unsupported_dumping_properties(); 3542 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments); 3543 } 3544 if (SharedArchiveFile == NULL) { 3545 SharedArchivePath = get_default_shared_archive_path(); 3546 } else { 3547 int archives = num_archives(SharedArchiveFile); 3548 if (DynamicDumpSharedSpaces || DumpSharedSpaces) { 3549 if (archives > 1) { 3550 vm_exit_during_initialization( 3551 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3552 } 3553 if (DynamicDumpSharedSpaces) { 3554 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3555 vm_exit_during_initialization( 3556 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3557 SharedArchiveFile); 3558 } 3559 } 3560 } 3561 if (!DynamicDumpSharedSpaces && !DumpSharedSpaces){ 3562 if (archives > 2) { 3563 vm_exit_during_initialization( 3564 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3565 } 3566 if (archives == 1) { 3567 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3568 int name_size; 3569 bool success = 3570 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath); 3571 if (!success) { 3572 SharedArchivePath = temp_archive_path; 3573 } else { 3574 SharedDynamicArchivePath = temp_archive_path; 3575 } 3576 } else { 3577 extract_shared_archive_paths((const char*)SharedArchiveFile, 3578 &SharedArchivePath, &SharedDynamicArchivePath); 3579 } 3580 } else { // CDS dumping 3581 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3582 } 3583 } 3584 return (SharedArchivePath != NULL); 3585 } 3586 #endif // INCLUDE_CDS 3587 3588 #ifndef PRODUCT 3589 // Determine whether LogVMOutput should be implicitly turned on. 3590 static bool use_vm_log() { 3591 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3592 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3593 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3594 PrintAssembly || TraceDeoptimization || TraceDependencies || 3595 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3596 return true; 3597 } 3598 3599 #ifdef COMPILER1 3600 if (PrintC1Statistics) { 3601 return true; 3602 } 3603 #endif // COMPILER1 3604 3605 #ifdef COMPILER2 3606 if (PrintOptoAssembly || PrintOptoStatistics) { 3607 return true; 3608 } 3609 #endif // COMPILER2 3610 3611 return false; 3612 } 3613 3614 #endif // PRODUCT 3615 3616 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3617 for (int index = 0; index < args->nOptions; index++) { 3618 const JavaVMOption* option = args->options + index; 3619 const char* tail; 3620 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3621 return true; 3622 } 3623 } 3624 return false; 3625 } 3626 3627 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3628 const char* vm_options_file, 3629 const int vm_options_file_pos, 3630 ScopedVMInitArgs* vm_options_file_args, 3631 ScopedVMInitArgs* args_out) { 3632 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3633 if (code != JNI_OK) { 3634 return code; 3635 } 3636 3637 if (vm_options_file_args->get()->nOptions < 1) { 3638 return JNI_OK; 3639 } 3640 3641 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3642 jio_fprintf(defaultStream::error_stream(), 3643 "A VM options file may not refer to a VM options file. " 3644 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3645 "options file '%s' in options container '%s' is an error.\n", 3646 vm_options_file_args->vm_options_file_arg(), 3647 vm_options_file_args->container_name()); 3648 return JNI_EINVAL; 3649 } 3650 3651 return args_out->insert(args, vm_options_file_args->get(), 3652 vm_options_file_pos); 3653 } 3654 3655 // Expand -XX:VMOptionsFile found in args_in as needed. 3656 // mod_args and args_out parameters may return values as needed. 3657 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3658 ScopedVMInitArgs* mod_args, 3659 JavaVMInitArgs** args_out) { 3660 jint code = match_special_option_and_act(args_in, mod_args); 3661 if (code != JNI_OK) { 3662 return code; 3663 } 3664 3665 if (mod_args->is_set()) { 3666 // args_in contains -XX:VMOptionsFile and mod_args contains the 3667 // original options from args_in along with the options expanded 3668 // from the VMOptionsFile. Return a short-hand to the caller. 3669 *args_out = mod_args->get(); 3670 } else { 3671 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3672 } 3673 return JNI_OK; 3674 } 3675 3676 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3677 ScopedVMInitArgs* args_out) { 3678 // Remaining part of option string 3679 const char* tail; 3680 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3681 3682 for (int index = 0; index < args->nOptions; index++) { 3683 const JavaVMOption* option = args->options + index; 3684 if (match_option(option, "-XX:Flags=", &tail)) { 3685 Arguments::set_jvm_flags_file(tail); 3686 continue; 3687 } 3688 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3689 if (vm_options_file_args.found_vm_options_file_arg()) { 3690 jio_fprintf(defaultStream::error_stream(), 3691 "The option '%s' is already specified in the options " 3692 "container '%s' so the specification of '%s' in the " 3693 "same options container is an error.\n", 3694 vm_options_file_args.vm_options_file_arg(), 3695 vm_options_file_args.container_name(), 3696 option->optionString); 3697 return JNI_EINVAL; 3698 } 3699 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3700 // If there's a VMOptionsFile, parse that 3701 jint code = insert_vm_options_file(args, tail, index, 3702 &vm_options_file_args, args_out); 3703 if (code != JNI_OK) { 3704 return code; 3705 } 3706 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3707 if (args_out->is_set()) { 3708 // The VMOptions file inserted some options so switch 'args' 3709 // to the new set of options, and continue processing which 3710 // preserves "last option wins" semantics. 3711 args = args_out->get(); 3712 // The first option from the VMOptionsFile replaces the 3713 // current option. So we back track to process the 3714 // replacement option. 3715 index--; 3716 } 3717 continue; 3718 } 3719 if (match_option(option, "-XX:+PrintVMOptions")) { 3720 PrintVMOptions = true; 3721 continue; 3722 } 3723 if (match_option(option, "-XX:-PrintVMOptions")) { 3724 PrintVMOptions = false; 3725 continue; 3726 } 3727 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3728 IgnoreUnrecognizedVMOptions = true; 3729 continue; 3730 } 3731 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3732 IgnoreUnrecognizedVMOptions = false; 3733 continue; 3734 } 3735 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3736 JVMFlag::printFlags(tty, false); 3737 vm_exit(0); 3738 } 3739 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3740 #if INCLUDE_NMT 3741 // The launcher did not setup nmt environment variable properly. 3742 if (!MemTracker::check_launcher_nmt_support(tail)) { 3743 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3744 } 3745 3746 // Verify if nmt option is valid. 3747 if (MemTracker::verify_nmt_option()) { 3748 // Late initialization, still in single-threaded mode. 3749 if (MemTracker::tracking_level() >= NMT_summary) { 3750 MemTracker::init(); 3751 } 3752 } else { 3753 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3754 } 3755 continue; 3756 #else 3757 jio_fprintf(defaultStream::error_stream(), 3758 "Native Memory Tracking is not supported in this VM\n"); 3759 return JNI_ERR; 3760 #endif 3761 } 3762 3763 #ifndef PRODUCT 3764 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3765 JVMFlag::printFlags(tty, true); 3766 vm_exit(0); 3767 } 3768 #endif 3769 } 3770 return JNI_OK; 3771 } 3772 3773 static void print_options(const JavaVMInitArgs *args) { 3774 const char* tail; 3775 for (int index = 0; index < args->nOptions; index++) { 3776 const JavaVMOption *option = args->options + index; 3777 if (match_option(option, "-XX:", &tail)) { 3778 logOption(tail); 3779 } 3780 } 3781 } 3782 3783 bool Arguments::handle_deprecated_print_gc_flags() { 3784 if (PrintGC) { 3785 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3786 } 3787 if (PrintGCDetails) { 3788 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3789 } 3790 3791 if (_gc_log_filename != NULL) { 3792 // -Xloggc was used to specify a filename 3793 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3794 3795 LogTarget(Error, logging) target; 3796 LogStream errstream(target); 3797 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 3798 } else if (PrintGC || PrintGCDetails) { 3799 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3800 } 3801 return true; 3802 } 3803 3804 void Arguments::handle_extra_cms_flags(const char* msg) { 3805 SpecialFlag flag; 3806 const char *flag_name = "UseConcMarkSweepGC"; 3807 if (lookup_special_flag(flag_name, flag)) { 3808 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 3809 warning("%s", msg); 3810 } 3811 } 3812 3813 // Parse entry point called from JNI_CreateJavaVM 3814 3815 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3816 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 3817 3818 // Initialize ranges, constraints and writeables 3819 JVMFlagRangeList::init(); 3820 JVMFlagConstraintList::init(); 3821 JVMFlagWriteableList::init(); 3822 3823 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3824 const char* hotspotrc = ".hotspotrc"; 3825 bool settings_file_specified = false; 3826 bool needs_hotspotrc_warning = false; 3827 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3828 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3829 3830 // Pointers to current working set of containers 3831 JavaVMInitArgs* cur_cmd_args; 3832 JavaVMInitArgs* cur_java_options_args; 3833 JavaVMInitArgs* cur_java_tool_options_args; 3834 3835 // Containers for modified/expanded options 3836 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3837 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3838 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3839 3840 3841 jint code = 3842 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3843 if (code != JNI_OK) { 3844 return code; 3845 } 3846 3847 code = parse_java_options_environment_variable(&initial_java_options_args); 3848 if (code != JNI_OK) { 3849 return code; 3850 } 3851 3852 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3853 &mod_java_tool_options_args, 3854 &cur_java_tool_options_args); 3855 if (code != JNI_OK) { 3856 return code; 3857 } 3858 3859 code = expand_vm_options_as_needed(initial_cmd_args, 3860 &mod_cmd_args, 3861 &cur_cmd_args); 3862 if (code != JNI_OK) { 3863 return code; 3864 } 3865 3866 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3867 &mod_java_options_args, 3868 &cur_java_options_args); 3869 if (code != JNI_OK) { 3870 return code; 3871 } 3872 3873 const char* flags_file = Arguments::get_jvm_flags_file(); 3874 settings_file_specified = (flags_file != NULL); 3875 3876 if (IgnoreUnrecognizedVMOptions) { 3877 cur_cmd_args->ignoreUnrecognized = true; 3878 cur_java_tool_options_args->ignoreUnrecognized = true; 3879 cur_java_options_args->ignoreUnrecognized = true; 3880 } 3881 3882 // Parse specified settings file 3883 if (settings_file_specified) { 3884 if (!process_settings_file(flags_file, true, 3885 cur_cmd_args->ignoreUnrecognized)) { 3886 return JNI_EINVAL; 3887 } 3888 } else { 3889 #ifdef ASSERT 3890 // Parse default .hotspotrc settings file 3891 if (!process_settings_file(".hotspotrc", false, 3892 cur_cmd_args->ignoreUnrecognized)) { 3893 return JNI_EINVAL; 3894 } 3895 #else 3896 struct stat buf; 3897 if (os::stat(hotspotrc, &buf) == 0) { 3898 needs_hotspotrc_warning = true; 3899 } 3900 #endif 3901 } 3902 3903 if (PrintVMOptions) { 3904 print_options(cur_java_tool_options_args); 3905 print_options(cur_cmd_args); 3906 print_options(cur_java_options_args); 3907 } 3908 3909 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3910 jint result = parse_vm_init_args(cur_java_tool_options_args, 3911 cur_java_options_args, 3912 cur_cmd_args); 3913 3914 if (result != JNI_OK) { 3915 return result; 3916 } 3917 3918 #if INCLUDE_CDS 3919 // Initialize shared archive paths which could include both base and dynamic archive paths 3920 if (!init_shared_archive_paths()) { 3921 return JNI_ENOMEM; 3922 } 3923 #endif 3924 3925 // Delay warning until here so that we've had a chance to process 3926 // the -XX:-PrintWarnings flag 3927 if (needs_hotspotrc_warning) { 3928 warning("%s file is present but has been ignored. " 3929 "Run with -XX:Flags=%s to load the file.", 3930 hotspotrc, hotspotrc); 3931 } 3932 3933 if (needs_module_property_warning) { 3934 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3935 " names that are reserved for internal use."); 3936 } 3937 3938 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3939 UNSUPPORTED_OPTION(UseLargePages); 3940 #endif 3941 3942 #if defined(AIX) 3943 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3944 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt); 3945 #endif 3946 3947 #ifndef PRODUCT 3948 if (TraceBytecodesAt != 0) { 3949 TraceBytecodes = true; 3950 } 3951 if (CountCompiledCalls) { 3952 if (UseCounterDecay) { 3953 warning("UseCounterDecay disabled because CountCalls is set"); 3954 UseCounterDecay = false; 3955 } 3956 } 3957 #endif // PRODUCT 3958 3959 if (ScavengeRootsInCode == 0) { 3960 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3961 warning("Forcing ScavengeRootsInCode non-zero"); 3962 } 3963 ScavengeRootsInCode = 1; 3964 } 3965 3966 if (!handle_deprecated_print_gc_flags()) { 3967 return JNI_EINVAL; 3968 } 3969 3970 // Set object alignment values. 3971 set_object_alignment(); 3972 3973 #if !INCLUDE_CDS 3974 if (DumpSharedSpaces || RequireSharedSpaces) { 3975 jio_fprintf(defaultStream::error_stream(), 3976 "Shared spaces are not supported in this VM\n"); 3977 return JNI_ERR; 3978 } 3979 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 3980 log_is_enabled(Info, cds)) { 3981 warning("Shared spaces are not supported in this VM"); 3982 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3983 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3984 } 3985 no_shared_spaces("CDS Disabled"); 3986 #endif // INCLUDE_CDS 3987 3988 return JNI_OK; 3989 } 3990 3991 jint Arguments::apply_ergo() { 3992 // Set flags based on ergonomics. 3993 jint result = set_ergonomics_flags(); 3994 if (result != JNI_OK) return result; 3995 3996 // Set heap size based on available physical memory 3997 set_heap_size(); 3998 3999 GCConfig::arguments()->initialize(); 4000 4001 set_shared_spaces_flags(); 4002 4003 // Initialize Metaspace flags and alignments 4004 Metaspace::ergo_initialize(); 4005 4006 // Set compiler flags after GC is selected and GC specific 4007 // flags (LoopStripMiningIter) are set. 4008 CompilerConfig::ergo_initialize(); 4009 4010 // Set bytecode rewriting flags 4011 set_bytecode_flags(); 4012 4013 // Set flags if aggressive optimization flags are enabled 4014 jint code = set_aggressive_opts_flags(); 4015 if (code != JNI_OK) { 4016 return code; 4017 } 4018 4019 // Turn off biased locking for locking debug mode flags, 4020 // which are subtly different from each other but neither works with 4021 // biased locking 4022 if (UseHeavyMonitors 4023 #ifdef COMPILER1 4024 || !UseFastLocking 4025 #endif // COMPILER1 4026 #if INCLUDE_JVMCI 4027 || !JVMCIUseFastLocking 4028 #endif 4029 ) { 4030 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4031 // flag set to true on command line; warn the user that they 4032 // can't enable biased locking here 4033 warning("Biased Locking is not supported with locking debug flags" 4034 "; ignoring UseBiasedLocking flag." ); 4035 } 4036 UseBiasedLocking = false; 4037 } 4038 4039 #ifdef CC_INTERP 4040 // Clear flags not supported on zero. 4041 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4042 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4043 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4044 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4045 #endif // CC_INTERP 4046 4047 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4048 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4049 DebugNonSafepoints = true; 4050 } 4051 4052 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4053 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4054 } 4055 4056 // Treat the odd case where local verification is enabled but remote 4057 // verification is not as if both were enabled. 4058 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4059 log_info(verification)("Turning on remote verification because local verification is on"); 4060 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4061 } 4062 4063 #ifndef PRODUCT 4064 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4065 if (use_vm_log()) { 4066 LogVMOutput = true; 4067 } 4068 } 4069 #endif // PRODUCT 4070 4071 if (PrintCommandLineFlags) { 4072 JVMFlag::printSetFlags(tty); 4073 } 4074 4075 // Apply CPU specific policy for the BiasedLocking 4076 if (UseBiasedLocking) { 4077 if (!VM_Version::use_biased_locking() && 4078 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4079 UseBiasedLocking = false; 4080 } 4081 } 4082 #ifdef COMPILER2 4083 if (!UseBiasedLocking) { 4084 UseOptoBiasInlining = false; 4085 } 4086 #endif 4087 4088 #if defined(IA32) 4089 // Only server compiler can optimize safepoints well enough. 4090 if (!is_server_compilation_mode_vm()) { 4091 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false); 4092 } 4093 #endif 4094 4095 // ThreadLocalHandshakesConstraintFunc handles the constraints. 4096 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 4097 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4098 } else { 4099 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4100 } 4101 4102 return JNI_OK; 4103 } 4104 4105 jint Arguments::adjust_after_os() { 4106 if (UseNUMA) { 4107 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 4108 FLAG_SET_ERGO(UseNUMA, false); 4109 } else if (UseParallelGC || UseParallelOldGC) { 4110 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4111 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4112 } 4113 } 4114 // UseNUMAInterleaving is set to ON for all collectors and 4115 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4116 // such as Parallel GC for Linux and Solaris or G1 GC for Linux will 4117 // interleave old gen and survivor spaces on top of NUMA 4118 // allocation policy for the eden space. 4119 // Non NUMA-aware collectors such as CMS and Serial-GC on 4120 // all platforms and ParallelGC on Windows will interleave all 4121 // of the heap spaces across NUMA nodes. 4122 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4123 FLAG_SET_ERGO(UseNUMAInterleaving, true); 4124 } 4125 } 4126 return JNI_OK; 4127 } 4128 4129 int Arguments::PropertyList_count(SystemProperty* pl) { 4130 int count = 0; 4131 while(pl != NULL) { 4132 count++; 4133 pl = pl->next(); 4134 } 4135 return count; 4136 } 4137 4138 // Return the number of readable properties. 4139 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4140 int count = 0; 4141 while(pl != NULL) { 4142 if (pl->is_readable()) { 4143 count++; 4144 } 4145 pl = pl->next(); 4146 } 4147 return count; 4148 } 4149 4150 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4151 assert(key != NULL, "just checking"); 4152 SystemProperty* prop; 4153 for (prop = pl; prop != NULL; prop = prop->next()) { 4154 if (strcmp(key, prop->key()) == 0) return prop->value(); 4155 } 4156 return NULL; 4157 } 4158 4159 // Return the value of the requested property provided that it is a readable property. 4160 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4161 assert(key != NULL, "just checking"); 4162 SystemProperty* prop; 4163 // Return the property value if the keys match and the property is not internal or 4164 // it's the special internal property "jdk.boot.class.path.append". 4165 for (prop = pl; prop != NULL; prop = prop->next()) { 4166 if (strcmp(key, prop->key()) == 0) { 4167 if (!prop->internal()) { 4168 return prop->value(); 4169 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4170 return prop->value(); 4171 } else { 4172 // Property is internal and not jdk.boot.class.path.append so return NULL. 4173 return NULL; 4174 } 4175 } 4176 } 4177 return NULL; 4178 } 4179 4180 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4181 int count = 0; 4182 const char* ret_val = NULL; 4183 4184 while(pl != NULL) { 4185 if(count >= index) { 4186 ret_val = pl->key(); 4187 break; 4188 } 4189 count++; 4190 pl = pl->next(); 4191 } 4192 4193 return ret_val; 4194 } 4195 4196 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4197 int count = 0; 4198 char* ret_val = NULL; 4199 4200 while(pl != NULL) { 4201 if(count >= index) { 4202 ret_val = pl->value(); 4203 break; 4204 } 4205 count++; 4206 pl = pl->next(); 4207 } 4208 4209 return ret_val; 4210 } 4211 4212 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4213 SystemProperty* p = *plist; 4214 if (p == NULL) { 4215 *plist = new_p; 4216 } else { 4217 while (p->next() != NULL) { 4218 p = p->next(); 4219 } 4220 p->set_next(new_p); 4221 } 4222 } 4223 4224 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4225 bool writeable, bool internal) { 4226 if (plist == NULL) 4227 return; 4228 4229 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4230 PropertyList_add(plist, new_p); 4231 } 4232 4233 void Arguments::PropertyList_add(SystemProperty *element) { 4234 PropertyList_add(&_system_properties, element); 4235 } 4236 4237 // This add maintains unique property key in the list. 4238 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4239 PropertyAppendable append, PropertyWriteable writeable, 4240 PropertyInternal internal) { 4241 if (plist == NULL) 4242 return; 4243 4244 // If property key exist then update with new value. 4245 SystemProperty* prop; 4246 for (prop = *plist; prop != NULL; prop = prop->next()) { 4247 if (strcmp(k, prop->key()) == 0) { 4248 if (append == AppendProperty) { 4249 prop->append_value(v); 4250 } else { 4251 prop->set_value(v); 4252 } 4253 return; 4254 } 4255 } 4256 4257 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4258 } 4259 4260 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4261 // Returns true if all of the source pointed by src has been copied over to 4262 // the destination buffer pointed by buf. Otherwise, returns false. 4263 // Notes: 4264 // 1. If the length (buflen) of the destination buffer excluding the 4265 // NULL terminator character is not long enough for holding the expanded 4266 // pid characters, it also returns false instead of returning the partially 4267 // expanded one. 4268 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4269 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4270 char* buf, size_t buflen) { 4271 const char* p = src; 4272 char* b = buf; 4273 const char* src_end = &src[srclen]; 4274 char* buf_end = &buf[buflen - 1]; 4275 4276 while (p < src_end && b < buf_end) { 4277 if (*p == '%') { 4278 switch (*(++p)) { 4279 case '%': // "%%" ==> "%" 4280 *b++ = *p++; 4281 break; 4282 case 'p': { // "%p" ==> current process id 4283 // buf_end points to the character before the last character so 4284 // that we could write '\0' to the end of the buffer. 4285 size_t buf_sz = buf_end - b + 1; 4286 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4287 4288 // if jio_snprintf fails or the buffer is not long enough to hold 4289 // the expanded pid, returns false. 4290 if (ret < 0 || ret >= (int)buf_sz) { 4291 return false; 4292 } else { 4293 b += ret; 4294 assert(*b == '\0', "fail in copy_expand_pid"); 4295 if (p == src_end && b == buf_end + 1) { 4296 // reach the end of the buffer. 4297 return true; 4298 } 4299 } 4300 p++; 4301 break; 4302 } 4303 default : 4304 *b++ = '%'; 4305 } 4306 } else { 4307 *b++ = *p++; 4308 } 4309 } 4310 *b = '\0'; 4311 return (p == src_end); // return false if not all of the source was copied 4312 }