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 bool Arguments::_sun_java_launcher_is_altjvm = false; 86 87 // These parameters are reset in method parse_vm_init_args() 88 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 89 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 90 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 91 bool Arguments::_ClipInlining = ClipInlining; 92 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 93 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 94 95 bool Arguments::_enable_preview = false; 96 97 char* Arguments::SharedArchivePath = NULL; 98 char* Arguments::SharedDynamicArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 // These are not set by the JDK's built-in launchers, but they can be set by 104 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 105 // JavaVMOption in jni.h. 106 abort_hook_t Arguments::_abort_hook = NULL; 107 exit_hook_t Arguments::_exit_hook = NULL; 108 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 109 110 111 SystemProperty *Arguments::_sun_boot_library_path = NULL; 112 SystemProperty *Arguments::_java_library_path = NULL; 113 SystemProperty *Arguments::_java_home = NULL; 114 SystemProperty *Arguments::_java_class_path = NULL; 115 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 116 SystemProperty *Arguments::_vm_info = NULL; 117 118 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 119 PathString *Arguments::_system_boot_class_path = NULL; 120 bool Arguments::_has_jimage = false; 121 122 char* Arguments::_ext_dirs = NULL; 123 124 bool PathString::set_value(const char *value) { 125 if (_value != NULL) { 126 FreeHeap(_value); 127 } 128 _value = AllocateHeap(strlen(value)+1, mtArguments); 129 assert(_value != NULL, "Unable to allocate space for new path value"); 130 if (_value != NULL) { 131 strcpy(_value, value); 132 } else { 133 // not able to allocate 134 return false; 135 } 136 return true; 137 } 138 139 void PathString::append_value(const char *value) { 140 char *sp; 141 size_t len = 0; 142 if (value != NULL) { 143 len = strlen(value); 144 if (_value != NULL) { 145 len += strlen(_value); 146 } 147 sp = AllocateHeap(len+2, mtArguments); 148 assert(sp != NULL, "Unable to allocate space for new append path value"); 149 if (sp != NULL) { 150 if (_value != NULL) { 151 strcpy(sp, _value); 152 strcat(sp, os::path_separator()); 153 strcat(sp, value); 154 FreeHeap(_value); 155 } else { 156 strcpy(sp, value); 157 } 158 _value = sp; 159 } 160 } 161 } 162 163 PathString::PathString(const char* value) { 164 if (value == NULL) { 165 _value = NULL; 166 } else { 167 _value = AllocateHeap(strlen(value)+1, mtArguments); 168 strcpy(_value, value); 169 } 170 } 171 172 PathString::~PathString() { 173 if (_value != NULL) { 174 FreeHeap(_value); 175 _value = NULL; 176 } 177 } 178 179 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 180 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 181 size_t len = strlen(module_name) + 1; 182 _module_name = AllocateHeap(len, mtInternal); 183 strncpy(_module_name, module_name, len); // copy the trailing null 184 _path = new PathString(path); 185 } 186 187 ModulePatchPath::~ModulePatchPath() { 188 if (_module_name != NULL) { 189 FreeHeap(_module_name); 190 _module_name = NULL; 191 } 192 if (_path != NULL) { 193 delete _path; 194 _path = NULL; 195 } 196 } 197 198 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 199 if (key == NULL) { 200 _key = NULL; 201 } else { 202 _key = AllocateHeap(strlen(key)+1, mtArguments); 203 strcpy(_key, key); 204 } 205 _next = NULL; 206 _internal = internal; 207 _writeable = writeable; 208 } 209 210 AgentLibrary::AgentLibrary(const char* name, const char* options, 211 bool is_absolute_path, void* os_lib, 212 bool instrument_lib) { 213 _name = AllocateHeap(strlen(name)+1, mtArguments); 214 strcpy(_name, name); 215 if (options == NULL) { 216 _options = NULL; 217 } else { 218 _options = AllocateHeap(strlen(options)+1, mtArguments); 219 strcpy(_options, options); 220 } 221 _is_absolute_path = is_absolute_path; 222 _os_lib = os_lib; 223 _next = NULL; 224 _state = agent_invalid; 225 _is_static_lib = false; 226 _is_instrument_lib = instrument_lib; 227 } 228 229 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 230 // part of the option string. 231 static bool match_option(const JavaVMOption *option, const char* name, 232 const char** tail) { 233 size_t len = strlen(name); 234 if (strncmp(option->optionString, name, len) == 0) { 235 *tail = option->optionString + len; 236 return true; 237 } else { 238 return false; 239 } 240 } 241 242 // Check if 'option' matches 'name'. No "tail" is allowed. 243 static bool match_option(const JavaVMOption *option, const char* name) { 244 const char* tail = NULL; 245 bool result = match_option(option, name, &tail); 246 if (tail != NULL && *tail == '\0') { 247 return result; 248 } else { 249 return false; 250 } 251 } 252 253 // Return true if any of the strings in null-terminated array 'names' matches. 254 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 255 // the option must match exactly. 256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 257 bool tail_allowed) { 258 for (/* empty */; *names != NULL; ++names) { 259 if (match_option(option, *names, tail)) { 260 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 261 return true; 262 } 263 } 264 } 265 return false; 266 } 267 268 #if INCLUDE_JFR 269 static bool _has_jfr_option = false; // is using JFR 270 271 // return true on failure 272 static bool match_jfr_option(const JavaVMOption** option) { 273 assert((*option)->optionString != NULL, "invariant"); 274 char* tail = NULL; 275 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 276 _has_jfr_option = true; 277 return Jfr::on_start_flight_recording_option(option, tail); 278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 279 _has_jfr_option = true; 280 return Jfr::on_flight_recorder_option(option, tail); 281 } 282 return false; 283 } 284 285 bool Arguments::has_jfr_option() { 286 return _has_jfr_option; 287 } 288 #endif 289 290 static void logOption(const char* opt) { 291 if (PrintVMOptions) { 292 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 293 } 294 } 295 296 bool needs_module_property_warning = false; 297 298 #define MODULE_PROPERTY_PREFIX "jdk.module." 299 #define MODULE_PROPERTY_PREFIX_LEN 11 300 #define ADDEXPORTS "addexports" 301 #define ADDEXPORTS_LEN 10 302 #define ADDREADS "addreads" 303 #define ADDREADS_LEN 8 304 #define ADDOPENS "addopens" 305 #define ADDOPENS_LEN 8 306 #define PATCH "patch" 307 #define PATCH_LEN 5 308 #define ADDMODS "addmods" 309 #define ADDMODS_LEN 7 310 #define LIMITMODS "limitmods" 311 #define LIMITMODS_LEN 9 312 #define PATH "path" 313 #define PATH_LEN 4 314 #define UPGRADE_PATH "upgrade.path" 315 #define UPGRADE_PATH_LEN 12 316 317 void Arguments::add_init_library(const char* name, char* options) { 318 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 319 } 320 321 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 322 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 323 } 324 325 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 326 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 327 } 328 329 // Late-binding agents not started via arguments 330 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 331 _agentList.add(agentLib); 332 } 333 334 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 335 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 336 return ((strncmp(option, property, len) == 0) && 337 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 338 } 339 340 // Return true if property starts with "jdk.module." and its ensuing chars match 341 // any of the reserved module properties. 342 // property should be passed without the leading "-D". 343 bool Arguments::is_internal_module_property(const char* property) { 344 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 345 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 346 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 347 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 348 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 349 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 350 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 351 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 352 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 353 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 354 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 355 return true; 356 } 357 } 358 return false; 359 } 360 361 // Process java launcher properties. 362 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 363 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 364 // Must do this before setting up other system properties, 365 // as some of them may depend on launcher type. 366 for (int index = 0; index < args->nOptions; index++) { 367 const JavaVMOption* option = args->options + index; 368 const char* tail; 369 370 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 371 process_java_launcher_argument(tail, option->extraInfo); 372 continue; 373 } 374 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 375 if (strcmp(tail, "true") == 0) { 376 _sun_java_launcher_is_altjvm = true; 377 } 378 continue; 379 } 380 } 381 } 382 383 // Initialize system properties key and value. 384 void Arguments::init_system_properties() { 385 386 // Set up _system_boot_class_path which is not a property but 387 // relies heavily on argument processing and the jdk.boot.class.path.append 388 // property. It is used to store the underlying system boot class path. 389 _system_boot_class_path = new PathString(NULL); 390 391 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 392 "Java Virtual Machine Specification", false)); 393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 394 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 395 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 396 397 // Initialize the vm.info now, but it will need updating after argument parsing. 398 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 399 400 // Following are JVMTI agent writable properties. 401 // Properties values are set to NULL and they are 402 // os specific they are initialized in os::init_system_properties_values(). 403 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 404 _java_library_path = new SystemProperty("java.library.path", NULL, true); 405 _java_home = new SystemProperty("java.home", NULL, true); 406 _java_class_path = new SystemProperty("java.class.path", "", true); 407 // jdk.boot.class.path.append is a non-writeable, internal property. 408 // It can only be set by either: 409 // - -Xbootclasspath/a: 410 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 411 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 412 413 // Add to System Property list. 414 PropertyList_add(&_system_properties, _sun_boot_library_path); 415 PropertyList_add(&_system_properties, _java_library_path); 416 PropertyList_add(&_system_properties, _java_home); 417 PropertyList_add(&_system_properties, _java_class_path); 418 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 419 PropertyList_add(&_system_properties, _vm_info); 420 421 // Set OS specific system properties values 422 os::init_system_properties_values(); 423 } 424 425 // Update/Initialize System properties after JDK version number is known 426 void Arguments::init_version_specific_system_properties() { 427 enum { bufsz = 16 }; 428 char buffer[bufsz]; 429 const char* spec_vendor = "Oracle Corporation"; 430 uint32_t spec_version = JDK_Version::current().major_version(); 431 432 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 433 434 PropertyList_add(&_system_properties, 435 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 436 PropertyList_add(&_system_properties, 437 new SystemProperty("java.vm.specification.version", buffer, false)); 438 PropertyList_add(&_system_properties, 439 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 440 } 441 442 /* 443 * -XX argument processing: 444 * 445 * -XX arguments are defined in several places, such as: 446 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 447 * -XX arguments are parsed in parse_argument(). 448 * -XX argument bounds checking is done in check_vm_args_consistency(). 449 * 450 * Over time -XX arguments may change. There are mechanisms to handle common cases: 451 * 452 * ALIASED: An option that is simply another name for another option. This is often 453 * part of the process of deprecating a flag, but not all aliases need 454 * to be deprecated. 455 * 456 * Create an alias for an option by adding the old and new option names to the 457 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 458 * 459 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 460 * support may be removed in the future. Both regular and aliased options may be 461 * deprecated. 462 * 463 * Add a deprecation warning for an option (or alias) by adding an entry in the 464 * "special_jvm_flags" table and setting the "deprecated_in" field. 465 * Often an option "deprecated" in one major release will 466 * be made "obsolete" in the next. In this case the entry should also have its 467 * "obsolete_in" field set. 468 * 469 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 470 * on the command line. A warning is printed to let the user know that option might not 471 * be accepted in the future. 472 * 473 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 474 * table and setting the "obsolete_in" field. 475 * 476 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 477 * to the current JDK version. The system will flatly refuse to admit the existence of 478 * the flag. This allows a flag to die automatically over JDK releases. 479 * 480 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 481 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 482 * - Newly obsolete or expired deprecated options should have their global variable 483 * definitions removed (from globals.hpp, etc) and related implementations removed. 484 * 485 * Recommended approach for removing options: 486 * 487 * To remove options commonly used by customers (e.g. product -XX options), use 488 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 489 * 490 * To remove internal options (e.g. diagnostic, experimental, develop options), use 491 * a 2-step model adding major release numbers to the obsolete and expire columns. 492 * 493 * To change the name of an option, use the alias table as well as a 2-step 494 * model adding major release numbers to the deprecate and expire columns. 495 * Think twice about aliasing commonly used customer options. 496 * 497 * There are times when it is appropriate to leave a future release number as undefined. 498 * 499 * Tests: Aliases should be tested in VMAliasOptions.java. 500 * Deprecated options should be tested in VMDeprecatedOptions.java. 501 */ 502 503 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 504 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 505 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 506 // the command-line as usual, but will issue a warning. 507 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 508 // the command-line, while issuing a warning and ignoring the flag value. 509 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 510 // existence of the flag. 511 // 512 // MANUAL CLEANUP ON JDK VERSION UPDATES: 513 // This table ensures that the handling of options will update automatically when the JDK 514 // version is incremented, but the source code needs to be cleanup up manually: 515 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 516 // variable should be removed, as well as users of the variable. 517 // - As "deprecated" options age into "obsolete" options, move the entry into the 518 // "Obsolete Flags" section of the table. 519 // - All expired options should be removed from the table. 520 static SpecialFlag const special_jvm_flags[] = { 521 // -------------- Deprecated Flags -------------- 522 // --- Non-alias flags - sorted by obsolete_in then expired_in: 523 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 524 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 525 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 526 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 527 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 528 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() }, 529 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() }, 530 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 531 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 532 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 533 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 534 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 535 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 536 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 537 538 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 539 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 540 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 541 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 542 543 // -------------- Obsolete Flags - sorted by expired_in -------------- 544 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 545 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 546 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 547 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 548 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 549 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 550 { "FailOverToOldVerifier", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 551 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 552 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 553 554 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 555 // These entries will generate build errors. Their purpose is to test the macros. 556 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 557 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 558 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 559 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 560 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 561 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 562 #endif 563 564 { NULL, JDK_Version(0), JDK_Version(0) } 565 }; 566 567 // Flags that are aliases for other flags. 568 typedef struct { 569 const char* alias_name; 570 const char* real_name; 571 } AliasedFlag; 572 573 static AliasedFlag const aliased_jvm_flags[] = { 574 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 575 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 576 { NULL, NULL} 577 }; 578 579 // NOTE: A compatibility request will be necessary for each alias to be removed. 580 static AliasedLoggingFlag const aliased_logging_flags[] = { 581 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 582 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 583 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 584 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 585 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 586 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 587 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 588 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 589 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 590 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 591 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) }, 592 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 593 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 594 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 595 { "TraceNMethodInstalls", LogLevel::Info, true, LOG_TAGS(nmethod, install) }, 596 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 597 }; 598 599 #ifndef PRODUCT 600 // These options are removed in jdk9. Remove this code for jdk10. 601 static AliasedFlag const removed_develop_logging_flags[] = { 602 { "TraceClassInitialization", "-Xlog:class+init" }, 603 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 604 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 605 { "TraceItables", "-Xlog:itables=debug" }, 606 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 607 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 608 { "TraceStartupTime", "-Xlog:startuptime" }, 609 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 610 { "PrintVtables", "-Xlog:vtables=debug" }, 611 { "VerboseVerification", "-Xlog:verification" }, 612 { NULL, NULL } 613 }; 614 #endif //PRODUCT 615 616 // Return true if "v" is less than "other", where "other" may be "undefined". 617 static bool version_less_than(JDK_Version v, JDK_Version other) { 618 assert(!v.is_undefined(), "must be defined"); 619 if (!other.is_undefined() && v.compare(other) >= 0) { 620 return false; 621 } else { 622 return true; 623 } 624 } 625 626 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 627 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 628 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 629 flag = special_jvm_flags[i]; 630 return true; 631 } 632 } 633 return false; 634 } 635 636 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 637 assert(version != NULL, "Must provide a version buffer"); 638 SpecialFlag flag; 639 if (lookup_special_flag(flag_name, flag)) { 640 if (!flag.obsolete_in.is_undefined()) { 641 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 642 *version = flag.obsolete_in; 643 return true; 644 } 645 } 646 } 647 return false; 648 } 649 650 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 651 assert(version != NULL, "Must provide a version buffer"); 652 SpecialFlag flag; 653 if (lookup_special_flag(flag_name, flag)) { 654 if (!flag.deprecated_in.is_undefined()) { 655 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 656 version_less_than(JDK_Version::current(), flag.expired_in)) { 657 *version = flag.deprecated_in; 658 return 1; 659 } else { 660 return -1; 661 } 662 } 663 } 664 return 0; 665 } 666 667 #ifndef PRODUCT 668 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 669 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 670 const AliasedFlag& flag = removed_develop_logging_flags[i]; 671 if (strcmp(flag.alias_name, name) == 0) { 672 return flag.real_name; 673 } 674 } 675 return NULL; 676 } 677 #endif // PRODUCT 678 679 const char* Arguments::real_flag_name(const char *flag_name) { 680 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 681 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 682 if (strcmp(flag_status.alias_name, flag_name) == 0) { 683 return flag_status.real_name; 684 } 685 } 686 return flag_name; 687 } 688 689 #ifdef ASSERT 690 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 691 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 692 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 693 return true; 694 } 695 } 696 return false; 697 } 698 699 // Verifies the correctness of the entries in the special_jvm_flags table. 700 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 701 // version being earlier than the deprecation version, then a warning is issued 702 // and verification fails - by returning false. If it is detected that the table 703 // is out of date, with respect to the current version, then a warning is issued 704 // but verification does not fail. This allows the VM to operate when the version 705 // is first updated, without needing to update all the impacted flags at the 706 // same time. 707 static bool verify_special_jvm_flags() { 708 bool success = true; 709 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 710 const SpecialFlag& flag = special_jvm_flags[i]; 711 if (lookup_special_flag(flag.name, i)) { 712 warning("Duplicate special flag declaration \"%s\"", flag.name); 713 success = false; 714 } 715 if (flag.deprecated_in.is_undefined() && 716 flag.obsolete_in.is_undefined()) { 717 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 718 success = false; 719 } 720 721 if (!flag.deprecated_in.is_undefined()) { 722 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 723 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 724 success = false; 725 } 726 727 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 728 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 729 success = false; 730 } 731 } 732 733 if (!flag.obsolete_in.is_undefined()) { 734 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 735 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 736 success = false; 737 } 738 739 // if flag has become obsolete it should not have a "globals" flag defined anymore. 740 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 741 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 742 // Temporarily disable the warning: 8196739 743 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 744 } 745 } 746 } 747 748 if (!flag.expired_in.is_undefined()) { 749 // if flag has become expired it should not have a "globals" flag defined anymore. 750 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 751 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 752 // Temporarily disable the warning: 8196739 753 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 754 } 755 } 756 } 757 758 } 759 return success; 760 } 761 #endif 762 763 // Parses a size specification string. 764 bool Arguments::atojulong(const char *s, julong* result) { 765 julong n = 0; 766 767 // First char must be a digit. Don't allow negative numbers or leading spaces. 768 if (!isdigit(*s)) { 769 return false; 770 } 771 772 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 773 char* remainder; 774 errno = 0; 775 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 776 if (errno != 0) { 777 return false; 778 } 779 780 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 781 if (remainder == s || strlen(remainder) > 1) { 782 return false; 783 } 784 785 switch (*remainder) { 786 case 'T': case 't': 787 *result = n * G * K; 788 // Check for overflow. 789 if (*result/((julong)G * K) != n) return false; 790 return true; 791 case 'G': case 'g': 792 *result = n * G; 793 if (*result/G != n) return false; 794 return true; 795 case 'M': case 'm': 796 *result = n * M; 797 if (*result/M != n) return false; 798 return true; 799 case 'K': case 'k': 800 *result = n * K; 801 if (*result/K != n) return false; 802 return true; 803 case '\0': 804 *result = n; 805 return true; 806 default: 807 return false; 808 } 809 } 810 811 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 812 if (size < min_size) return arg_too_small; 813 if (size > max_size) return arg_too_big; 814 return arg_in_range; 815 } 816 817 // Describe an argument out of range error 818 void Arguments::describe_range_error(ArgsRange errcode) { 819 switch(errcode) { 820 case arg_too_big: 821 jio_fprintf(defaultStream::error_stream(), 822 "The specified size exceeds the maximum " 823 "representable size.\n"); 824 break; 825 case arg_too_small: 826 case arg_unreadable: 827 case arg_in_range: 828 // do nothing for now 829 break; 830 default: 831 ShouldNotReachHere(); 832 } 833 } 834 835 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) { 836 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) { 837 return true; 838 } else { 839 return false; 840 } 841 } 842 843 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 844 char* end; 845 errno = 0; 846 double v = strtod(value, &end); 847 if ((errno != 0) || (*end != 0)) { 848 return false; 849 } 850 851 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) { 852 return true; 853 } 854 return false; 855 } 856 857 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 858 julong v; 859 int int_v; 860 intx intx_v; 861 bool is_neg = false; 862 863 if (flag == NULL) { 864 return false; 865 } 866 867 // Check the sign first since atojulong() parses only unsigned values. 868 if (*value == '-') { 869 if (!flag->is_intx() && !flag->is_int()) { 870 return false; 871 } 872 value++; 873 is_neg = true; 874 } 875 if (!Arguments::atojulong(value, &v)) { 876 return false; 877 } 878 if (flag->is_int()) { 879 int_v = (int) v; 880 if (is_neg) { 881 int_v = -int_v; 882 } 883 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS; 884 } else if (flag->is_uint()) { 885 uint uint_v = (uint) v; 886 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS; 887 } else if (flag->is_intx()) { 888 intx_v = (intx) v; 889 if (is_neg) { 890 intx_v = -intx_v; 891 } 892 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS; 893 } else if (flag->is_uintx()) { 894 uintx uintx_v = (uintx) v; 895 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS; 896 } else if (flag->is_uint64_t()) { 897 uint64_t uint64_t_v = (uint64_t) v; 898 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS; 899 } else if (flag->is_size_t()) { 900 size_t size_t_v = (size_t) v; 901 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS; 902 } else if (flag->is_double()) { 903 double double_v = (double) v; 904 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS; 905 } else { 906 return false; 907 } 908 } 909 910 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) { 911 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false; 912 // Contract: JVMFlag always returns a pointer that needs freeing. 913 FREE_C_HEAP_ARRAY(char, value); 914 return true; 915 } 916 917 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) { 918 const char* old_value = ""; 919 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false; 920 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 921 size_t new_len = strlen(new_value); 922 const char* value; 923 char* free_this_too = NULL; 924 if (old_len == 0) { 925 value = new_value; 926 } else if (new_len == 0) { 927 value = old_value; 928 } else { 929 size_t length = old_len + 1 + new_len + 1; 930 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 931 // each new setting adds another LINE to the switch: 932 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 933 value = buf; 934 free_this_too = buf; 935 } 936 (void) JVMFlag::ccstrAtPut(flag, &value, origin); 937 // JVMFlag always returns a pointer that needs freeing. 938 FREE_C_HEAP_ARRAY(char, value); 939 // JVMFlag made its own copy, so I must delete my own temp. buffer. 940 FREE_C_HEAP_ARRAY(char, free_this_too); 941 return true; 942 } 943 944 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 945 const char* real_name = real_flag_name(arg); 946 JDK_Version since = JDK_Version(); 947 switch (is_deprecated_flag(arg, &since)) { 948 case -1: 949 return NULL; // obsolete or expired, don't process normally 950 case 0: 951 return real_name; 952 case 1: { 953 if (warn) { 954 char version[256]; 955 since.to_string(version, sizeof(version)); 956 if (real_name != arg) { 957 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 958 arg, version, real_name); 959 } else { 960 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 961 arg, version); 962 } 963 } 964 return real_name; 965 } 966 } 967 ShouldNotReachHere(); 968 return NULL; 969 } 970 971 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 972 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 973 // Set tagset string buffer at max size of 256, large enough for any alias tagset 974 const int max_tagset_size = 256; 975 int max_tagset_len = max_tagset_size - 1; 976 char tagset_buffer[max_tagset_size]; 977 tagset_buffer[0] = '\0'; 978 979 // Write tag-set for aliased logging option, in string list form 980 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 981 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 982 if (i > 0) { 983 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 984 } 985 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 986 } 987 if (!alf.exactMatch) { 988 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 989 } 990 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 991 (on) ? "+" : "-", 992 name, 993 tagset_buffer, 994 (on) ? LogLevel::name(alf.level) : "off"); 995 } 996 997 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 998 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 999 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1000 if (strcmp(alf.alias_name, name) == 0) { 1001 log_deprecated_flag(name, on, alf); 1002 return alf; 1003 } 1004 } 1005 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1006 return a; 1007 } 1008 1009 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) { 1010 1011 // range of acceptable characters spelled out for portability reasons 1012 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1013 #define BUFLEN 255 1014 char name[BUFLEN+1]; 1015 char dummy; 1016 const char* real_name; 1017 bool warn_if_deprecated = true; 1018 1019 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1020 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1021 if (alf.alias_name != NULL){ 1022 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1023 return true; 1024 } 1025 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1026 if (real_name == NULL) { 1027 return false; 1028 } 1029 JVMFlag* flag = JVMFlag::find_flag(real_name); 1030 return set_bool_flag(flag, false, origin); 1031 } 1032 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1033 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1034 if (alf.alias_name != NULL){ 1035 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1036 return true; 1037 } 1038 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1039 if (real_name == NULL) { 1040 return false; 1041 } 1042 JVMFlag* flag = JVMFlag::find_flag(real_name); 1043 return set_bool_flag(flag, true, origin); 1044 } 1045 1046 char punct; 1047 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1048 const char* value = strchr(arg, '=') + 1; 1049 1050 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1051 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1052 if (alf.alias_name != NULL) { 1053 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1054 return true; 1055 } 1056 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1057 if (real_name == NULL) { 1058 return false; 1059 } 1060 JVMFlag* flag = JVMFlag::find_flag(real_name); 1061 if (flag != NULL && flag->is_ccstr()) { 1062 if (flag->ccstr_accumulates()) { 1063 return append_to_string_flag(flag, value, origin); 1064 } else { 1065 if (value[0] == '\0') { 1066 value = NULL; 1067 } 1068 return set_string_flag(flag, value, origin); 1069 } 1070 } else { 1071 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1072 } 1073 } 1074 1075 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1076 const char* value = strchr(arg, '=') + 1; 1077 // -XX:Foo:=xxx will reset the string flag to the given value. 1078 if (value[0] == '\0') { 1079 value = NULL; 1080 } 1081 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1082 if (real_name == NULL) { 1083 return false; 1084 } 1085 JVMFlag* flag = JVMFlag::find_flag(real_name); 1086 return set_string_flag(flag, value, origin); 1087 } 1088 1089 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1090 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1091 #define NUMBER_RANGE "[0123456789eE+-]" 1092 char value[BUFLEN + 1]; 1093 char value2[BUFLEN + 1]; 1094 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1095 // Looks like a floating-point number -- try again with more lenient format string 1096 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1097 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1098 if (real_name == NULL) { 1099 return false; 1100 } 1101 JVMFlag* flag = JVMFlag::find_flag(real_name); 1102 return set_fp_numeric_flag(flag, value, origin); 1103 } 1104 } 1105 1106 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1107 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1108 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1109 if (real_name == NULL) { 1110 return false; 1111 } 1112 JVMFlag* flag = JVMFlag::find_flag(real_name); 1113 return set_numeric_flag(flag, value, origin); 1114 } 1115 1116 return false; 1117 } 1118 1119 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1120 assert(bldarray != NULL, "illegal argument"); 1121 1122 if (arg == NULL) { 1123 return; 1124 } 1125 1126 int new_count = *count + 1; 1127 1128 // expand the array and add arg to the last element 1129 if (*bldarray == NULL) { 1130 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1131 } else { 1132 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1133 } 1134 (*bldarray)[*count] = os::strdup_check_oom(arg); 1135 *count = new_count; 1136 } 1137 1138 void Arguments::build_jvm_args(const char* arg) { 1139 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1140 } 1141 1142 void Arguments::build_jvm_flags(const char* arg) { 1143 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1144 } 1145 1146 // utility function to return a string that concatenates all 1147 // strings in a given char** array 1148 const char* Arguments::build_resource_string(char** args, int count) { 1149 if (args == NULL || count == 0) { 1150 return NULL; 1151 } 1152 size_t length = 0; 1153 for (int i = 0; i < count; i++) { 1154 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1155 } 1156 char* s = NEW_RESOURCE_ARRAY(char, length); 1157 char* dst = s; 1158 for (int j = 0; j < count; j++) { 1159 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1160 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1161 dst += offset; 1162 length -= offset; 1163 } 1164 return (const char*) s; 1165 } 1166 1167 void Arguments::print_on(outputStream* st) { 1168 st->print_cr("VM Arguments:"); 1169 if (num_jvm_flags() > 0) { 1170 st->print("jvm_flags: "); print_jvm_flags_on(st); 1171 st->cr(); 1172 } 1173 if (num_jvm_args() > 0) { 1174 st->print("jvm_args: "); print_jvm_args_on(st); 1175 st->cr(); 1176 } 1177 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1178 if (_java_class_path != NULL) { 1179 char* path = _java_class_path->value(); 1180 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1181 } 1182 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1183 } 1184 1185 void Arguments::print_summary_on(outputStream* st) { 1186 // Print the command line. Environment variables that are helpful for 1187 // reproducing the problem are written later in the hs_err file. 1188 // flags are from setting file 1189 if (num_jvm_flags() > 0) { 1190 st->print_raw("Settings File: "); 1191 print_jvm_flags_on(st); 1192 st->cr(); 1193 } 1194 // args are the command line and environment variable arguments. 1195 st->print_raw("Command Line: "); 1196 if (num_jvm_args() > 0) { 1197 print_jvm_args_on(st); 1198 } 1199 // this is the classfile and any arguments to the java program 1200 if (java_command() != NULL) { 1201 st->print("%s", java_command()); 1202 } 1203 st->cr(); 1204 } 1205 1206 void Arguments::print_jvm_flags_on(outputStream* st) { 1207 if (_num_jvm_flags > 0) { 1208 for (int i=0; i < _num_jvm_flags; i++) { 1209 st->print("%s ", _jvm_flags_array[i]); 1210 } 1211 } 1212 } 1213 1214 void Arguments::print_jvm_args_on(outputStream* st) { 1215 if (_num_jvm_args > 0) { 1216 for (int i=0; i < _num_jvm_args; i++) { 1217 st->print("%s ", _jvm_args_array[i]); 1218 } 1219 } 1220 } 1221 1222 bool Arguments::process_argument(const char* arg, 1223 jboolean ignore_unrecognized, 1224 JVMFlag::Flags origin) { 1225 JDK_Version since = JDK_Version(); 1226 1227 if (parse_argument(arg, origin)) { 1228 return true; 1229 } 1230 1231 // Determine if the flag has '+', '-', or '=' characters. 1232 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1233 const char* const argname = has_plus_minus ? arg + 1 : arg; 1234 1235 size_t arg_len; 1236 const char* equal_sign = strchr(argname, '='); 1237 if (equal_sign == NULL) { 1238 arg_len = strlen(argname); 1239 } else { 1240 arg_len = equal_sign - argname; 1241 } 1242 1243 // Only make the obsolete check for valid arguments. 1244 if (arg_len <= BUFLEN) { 1245 // Construct a string which consists only of the argument name without '+', '-', or '='. 1246 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1247 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1248 if (is_obsolete_flag(stripped_argname, &since)) { 1249 char version[256]; 1250 since.to_string(version, sizeof(version)); 1251 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1252 return true; 1253 } 1254 #ifndef PRODUCT 1255 else { 1256 const char* replacement; 1257 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1258 log_warning(arguments)("%s has been removed. Please use %s instead.", 1259 stripped_argname, 1260 replacement); 1261 return false; 1262 } 1263 } 1264 #endif //PRODUCT 1265 } 1266 1267 // For locked flags, report a custom error message if available. 1268 // Otherwise, report the standard unrecognized VM option. 1269 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1270 if (found_flag != NULL) { 1271 char locked_message_buf[BUFLEN]; 1272 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1273 if (strlen(locked_message_buf) == 0) { 1274 if (found_flag->is_bool() && !has_plus_minus) { 1275 jio_fprintf(defaultStream::error_stream(), 1276 "Missing +/- setting for VM option '%s'\n", argname); 1277 } else if (!found_flag->is_bool() && has_plus_minus) { 1278 jio_fprintf(defaultStream::error_stream(), 1279 "Unexpected +/- setting in VM option '%s'\n", argname); 1280 } else { 1281 jio_fprintf(defaultStream::error_stream(), 1282 "Improperly specified VM option '%s'\n", argname); 1283 } 1284 } else { 1285 #ifdef PRODUCT 1286 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1287 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1288 if (ignore_unrecognized && mismatched) { 1289 return true; 1290 } 1291 #endif 1292 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1293 } 1294 } else { 1295 if (ignore_unrecognized) { 1296 return true; 1297 } 1298 jio_fprintf(defaultStream::error_stream(), 1299 "Unrecognized VM option '%s'\n", argname); 1300 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1301 if (fuzzy_matched != NULL) { 1302 jio_fprintf(defaultStream::error_stream(), 1303 "Did you mean '%s%s%s'? ", 1304 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1305 fuzzy_matched->_name, 1306 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1307 } 1308 } 1309 1310 // allow for commandline "commenting out" options like -XX:#+Verbose 1311 return arg[0] == '#'; 1312 } 1313 1314 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1315 FILE* stream = fopen(file_name, "rb"); 1316 if (stream == NULL) { 1317 if (should_exist) { 1318 jio_fprintf(defaultStream::error_stream(), 1319 "Could not open settings file %s\n", file_name); 1320 return false; 1321 } else { 1322 return true; 1323 } 1324 } 1325 1326 char token[1024]; 1327 int pos = 0; 1328 1329 bool in_white_space = true; 1330 bool in_comment = false; 1331 bool in_quote = false; 1332 char quote_c = 0; 1333 bool result = true; 1334 1335 int c = getc(stream); 1336 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1337 if (in_white_space) { 1338 if (in_comment) { 1339 if (c == '\n') in_comment = false; 1340 } else { 1341 if (c == '#') in_comment = true; 1342 else if (!isspace(c)) { 1343 in_white_space = false; 1344 token[pos++] = c; 1345 } 1346 } 1347 } else { 1348 if (c == '\n' || (!in_quote && isspace(c))) { 1349 // token ends at newline, or at unquoted whitespace 1350 // this allows a way to include spaces in string-valued options 1351 token[pos] = '\0'; 1352 logOption(token); 1353 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1354 build_jvm_flags(token); 1355 pos = 0; 1356 in_white_space = true; 1357 in_quote = false; 1358 } else if (!in_quote && (c == '\'' || c == '"')) { 1359 in_quote = true; 1360 quote_c = c; 1361 } else if (in_quote && (c == quote_c)) { 1362 in_quote = false; 1363 } else { 1364 token[pos++] = c; 1365 } 1366 } 1367 c = getc(stream); 1368 } 1369 if (pos > 0) { 1370 token[pos] = '\0'; 1371 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1372 build_jvm_flags(token); 1373 } 1374 fclose(stream); 1375 return result; 1376 } 1377 1378 //============================================================================================================= 1379 // Parsing of properties (-D) 1380 1381 const char* Arguments::get_property(const char* key) { 1382 return PropertyList_get_value(system_properties(), key); 1383 } 1384 1385 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1386 const char* eq = strchr(prop, '='); 1387 const char* key; 1388 const char* value = ""; 1389 1390 if (eq == NULL) { 1391 // property doesn't have a value, thus use passed string 1392 key = prop; 1393 } else { 1394 // property have a value, thus extract it and save to the 1395 // allocated string 1396 size_t key_len = eq - prop; 1397 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1398 1399 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1400 key = tmp_key; 1401 1402 value = &prop[key_len + 1]; 1403 } 1404 1405 if (strcmp(key, "java.compiler") == 0) { 1406 process_java_compiler_argument(value); 1407 // Record value in Arguments, but let it get passed to Java. 1408 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1409 // sun.java.launcher.is_altjvm property is 1410 // private and is processed in process_sun_java_launcher_properties(); 1411 // the sun.java.launcher property is passed on to the java application 1412 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1413 // append is true, writable is true, internal is false 1414 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1415 WriteableProperty, ExternalProperty); 1416 } else { 1417 if (strcmp(key, "sun.java.command") == 0) { 1418 char *old_java_command = _java_command; 1419 _java_command = os::strdup_check_oom(value, mtArguments); 1420 if (old_java_command != NULL) { 1421 os::free(old_java_command); 1422 } 1423 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1424 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1425 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1426 // its value without going through the property list or making a Java call. 1427 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1428 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1429 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1430 os::free((void *)old_java_vendor_url_bug); 1431 } 1432 } 1433 1434 // Create new property and add at the end of the list 1435 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1436 } 1437 1438 if (key != prop) { 1439 // SystemProperty copy passed value, thus free previously allocated 1440 // memory 1441 FreeHeap((void *)key); 1442 } 1443 1444 return true; 1445 } 1446 1447 #if INCLUDE_CDS 1448 const char* unsupported_properties[] = { "jdk.module.limitmods", 1449 "jdk.module.upgrade.path", 1450 "jdk.module.patch.0" }; 1451 const char* unsupported_options[] = { "--limit-modules", 1452 "--upgrade-module-path", 1453 "--patch-module" 1454 }; 1455 void Arguments::check_unsupported_dumping_properties() { 1456 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, 1457 "this function is only used with CDS dump time"); 1458 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1459 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1460 SystemProperty* sp = system_properties(); 1461 while (sp != NULL) { 1462 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1463 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1464 vm_exit_during_initialization( 1465 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1466 } 1467 } 1468 sp = sp->next(); 1469 } 1470 1471 // Check for an exploded module build in use with -Xshare:dump. 1472 if (!has_jimage()) { 1473 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1474 } 1475 } 1476 1477 bool Arguments::check_unsupported_cds_runtime_properties() { 1478 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1479 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1480 if (ArchiveClassesAtExit != NULL) { 1481 // dynamic dumping, just return false for now. 1482 // check_unsupported_dumping_properties() will be called later to check the same set of 1483 // properties, and will exit the VM with the correct error message if the unsupported properties 1484 // are used. 1485 return false; 1486 } 1487 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1488 if (get_property(unsupported_properties[i]) != NULL) { 1489 if (RequireSharedSpaces) { 1490 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1491 } 1492 return true; 1493 } 1494 } 1495 return false; 1496 } 1497 #endif 1498 1499 //=========================================================================================================== 1500 // Setting int/mixed/comp mode flags 1501 1502 void Arguments::set_mode_flags(Mode mode) { 1503 // Set up default values for all flags. 1504 // If you add a flag to any of the branches below, 1505 // add a default value for it here. 1506 set_java_compiler(false); 1507 _mode = mode; 1508 1509 // Ensure Agent_OnLoad has the correct initial values. 1510 // This may not be the final mode; mode may change later in onload phase. 1511 PropertyList_unique_add(&_system_properties, "java.vm.info", 1512 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1513 1514 UseInterpreter = true; 1515 UseCompiler = true; 1516 UseLoopCounter = true; 1517 1518 // Default values may be platform/compiler dependent - 1519 // use the saved values 1520 ClipInlining = Arguments::_ClipInlining; 1521 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1522 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1523 BackgroundCompilation = Arguments::_BackgroundCompilation; 1524 if (TieredCompilation) { 1525 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1526 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1527 } 1528 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1529 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1530 } 1531 } 1532 1533 // Change from defaults based on mode 1534 switch (mode) { 1535 default: 1536 ShouldNotReachHere(); 1537 break; 1538 case _int: 1539 UseCompiler = false; 1540 UseLoopCounter = false; 1541 AlwaysCompileLoopMethods = false; 1542 UseOnStackReplacement = false; 1543 break; 1544 case _mixed: 1545 // same as default 1546 break; 1547 case _comp: 1548 UseInterpreter = false; 1549 BackgroundCompilation = false; 1550 ClipInlining = false; 1551 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1552 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1553 // compile a level 4 (C2) and then continue executing it. 1554 if (TieredCompilation) { 1555 Tier3InvokeNotifyFreqLog = 0; 1556 Tier4InvocationThreshold = 0; 1557 } 1558 break; 1559 } 1560 } 1561 1562 // Conflict: required to use shared spaces (-Xshare:on), but 1563 // incompatible command line options were chosen. 1564 static void no_shared_spaces(const char* message) { 1565 if (RequireSharedSpaces) { 1566 jio_fprintf(defaultStream::error_stream(), 1567 "Class data sharing is inconsistent with other specified options.\n"); 1568 vm_exit_during_initialization("Unable to use shared archive", message); 1569 } else { 1570 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1571 } 1572 } 1573 1574 void set_object_alignment() { 1575 // Object alignment. 1576 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1577 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1578 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1579 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1580 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1581 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1582 1583 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1584 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1585 1586 // Oop encoding heap max 1587 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1588 1589 if (SurvivorAlignmentInBytes == 0) { 1590 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1591 } 1592 } 1593 1594 size_t Arguments::max_heap_for_compressed_oops() { 1595 // Avoid sign flip. 1596 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1597 // We need to fit both the NULL page and the heap into the memory budget, while 1598 // keeping alignment constraints of the heap. To guarantee the latter, as the 1599 // NULL page is located before the heap, we pad the NULL page to the conservative 1600 // maximum alignment that the GC may ever impose upon the heap. 1601 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1602 _conservative_max_heap_alignment); 1603 1604 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1605 NOT_LP64(ShouldNotReachHere(); return 0); 1606 } 1607 1608 void Arguments::set_use_compressed_oops() { 1609 #ifndef ZERO 1610 #ifdef _LP64 1611 // MaxHeapSize is not set up properly at this point, but 1612 // the only value that can override MaxHeapSize if we are 1613 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1614 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1615 1616 if (max_heap_size <= max_heap_for_compressed_oops()) { 1617 #if !defined(COMPILER1) || defined(TIERED) 1618 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1619 FLAG_SET_ERGO(UseCompressedOops, true); 1620 } 1621 #endif 1622 } else { 1623 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1624 warning("Max heap size too large for Compressed Oops"); 1625 FLAG_SET_DEFAULT(UseCompressedOops, false); 1626 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1627 } 1628 } 1629 #endif // _LP64 1630 #endif // ZERO 1631 } 1632 1633 1634 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1635 // set_use_compressed_oops(). 1636 void Arguments::set_use_compressed_klass_ptrs() { 1637 #ifndef ZERO 1638 #ifdef _LP64 1639 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1640 if (!UseCompressedOops) { 1641 if (UseCompressedClassPointers) { 1642 warning("UseCompressedClassPointers requires UseCompressedOops"); 1643 } 1644 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1645 } else { 1646 // Turn on UseCompressedClassPointers too 1647 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1648 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1649 } 1650 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1651 if (UseCompressedClassPointers) { 1652 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1653 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1654 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1655 } 1656 } 1657 } 1658 #endif // _LP64 1659 #endif // !ZERO 1660 } 1661 1662 void Arguments::set_conservative_max_heap_alignment() { 1663 // The conservative maximum required alignment for the heap is the maximum of 1664 // the alignments imposed by several sources: any requirements from the heap 1665 // itself and the maximum page size we may run the VM with. 1666 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1667 _conservative_max_heap_alignment = MAX4(heap_alignment, 1668 (size_t)os::vm_allocation_granularity(), 1669 os::max_page_size(), 1670 GCArguments::compute_heap_alignment()); 1671 } 1672 1673 jint Arguments::set_ergonomics_flags() { 1674 GCConfig::initialize(); 1675 1676 set_conservative_max_heap_alignment(); 1677 1678 #ifndef ZERO 1679 #ifdef _LP64 1680 set_use_compressed_oops(); 1681 1682 // set_use_compressed_klass_ptrs() must be called after calling 1683 // set_use_compressed_oops(). 1684 set_use_compressed_klass_ptrs(); 1685 1686 // Also checks that certain machines are slower with compressed oops 1687 // in vm_version initialization code. 1688 #endif // _LP64 1689 #endif // !ZERO 1690 1691 return JNI_OK; 1692 } 1693 1694 julong Arguments::limit_by_allocatable_memory(julong limit) { 1695 julong max_allocatable; 1696 julong result = limit; 1697 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1698 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1699 } 1700 return result; 1701 } 1702 1703 // Use static initialization to get the default before parsing 1704 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1705 1706 void Arguments::set_heap_size() { 1707 julong phys_mem; 1708 1709 // If the user specified one of these options, they 1710 // want specific memory sizing so do not limit memory 1711 // based on compressed oops addressability. 1712 // Also, memory limits will be calculated based on 1713 // available os physical memory, not our MaxRAM limit, 1714 // unless MaxRAM is also specified. 1715 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1716 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1717 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1718 !FLAG_IS_DEFAULT(MinRAMFraction) || 1719 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1720 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1721 !FLAG_IS_DEFAULT(MaxRAM)); 1722 if (override_coop_limit) { 1723 if (FLAG_IS_DEFAULT(MaxRAM)) { 1724 phys_mem = os::physical_memory(); 1725 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1726 } else { 1727 phys_mem = (julong)MaxRAM; 1728 } 1729 } else { 1730 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1731 : (julong)MaxRAM; 1732 } 1733 1734 1735 // Convert deprecated flags 1736 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1737 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1738 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1739 1740 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1741 !FLAG_IS_DEFAULT(MinRAMFraction)) 1742 MinRAMPercentage = 100.0 / MinRAMFraction; 1743 1744 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1745 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1746 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1747 1748 // If the maximum heap size has not been set with -Xmx, 1749 // then set it as fraction of the size of physical memory, 1750 // respecting the maximum and minimum sizes of the heap. 1751 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1752 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1753 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1754 if (reasonable_min < MaxHeapSize) { 1755 // Small physical memory, so use a minimum fraction of it for the heap 1756 reasonable_max = reasonable_min; 1757 } else { 1758 // Not-small physical memory, so require a heap at least 1759 // as large as MaxHeapSize 1760 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1761 } 1762 1763 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1764 // Limit the heap size to ErgoHeapSizeLimit 1765 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1766 } 1767 1768 #ifdef _LP64 1769 if (UseCompressedOops) { 1770 // Limit the heap size to the maximum possible when using compressed oops 1771 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1772 1773 // HeapBaseMinAddress can be greater than default but not less than. 1774 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1775 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1776 // matches compressed oops printing flags 1777 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1778 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1779 DefaultHeapBaseMinAddress, 1780 DefaultHeapBaseMinAddress/G, 1781 HeapBaseMinAddress); 1782 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1783 } 1784 } 1785 1786 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1787 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1788 // but it should be not less than default MaxHeapSize. 1789 max_coop_heap -= HeapBaseMinAddress; 1790 } 1791 1792 // If user specified flags prioritizing os physical 1793 // memory limits, then disable compressed oops if 1794 // limits exceed max_coop_heap and UseCompressedOops 1795 // was not specified. 1796 if (reasonable_max > max_coop_heap) { 1797 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1798 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1799 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1800 "Please check the setting of MaxRAMPercentage %5.2f." 1801 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1802 FLAG_SET_ERGO(UseCompressedOops, false); 1803 FLAG_SET_ERGO(UseCompressedClassPointers, false); 1804 } else { 1805 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1806 } 1807 } 1808 } 1809 #endif // _LP64 1810 1811 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1812 1813 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1814 // An initial heap size was specified on the command line, 1815 // so be sure that the maximum size is consistent. Done 1816 // after call to limit_by_allocatable_memory because that 1817 // method might reduce the allocation size. 1818 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1819 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1820 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1821 } 1822 1823 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1824 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1825 } 1826 1827 // If the minimum or initial heap_size have not been set or requested to be set 1828 // ergonomically, set them accordingly. 1829 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1830 julong reasonable_minimum = (julong)(OldSize + NewSize); 1831 1832 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1833 1834 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1835 1836 if (InitialHeapSize == 0) { 1837 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1838 1839 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1840 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1841 1842 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1843 1844 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1845 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1846 } 1847 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1848 // synchronize with InitialHeapSize to avoid errors with the default value. 1849 if (MinHeapSize == 0) { 1850 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1851 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1852 } 1853 } 1854 } 1855 1856 // This option inspects the machine and attempts to set various 1857 // parameters to be optimal for long-running, memory allocation 1858 // intensive jobs. It is intended for machines with large 1859 // amounts of cpu and memory. 1860 jint Arguments::set_aggressive_heap_flags() { 1861 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1862 // VM, but we may not be able to represent the total physical memory 1863 // available (like having 8gb of memory on a box but using a 32bit VM). 1864 // Thus, we need to make sure we're using a julong for intermediate 1865 // calculations. 1866 julong initHeapSize; 1867 julong total_memory = os::physical_memory(); 1868 1869 if (total_memory < (julong) 256 * M) { 1870 jio_fprintf(defaultStream::error_stream(), 1871 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1872 vm_exit(1); 1873 } 1874 1875 // The heap size is half of available memory, or (at most) 1876 // all of possible memory less 160mb (leaving room for the OS 1877 // when using ISM). This is the maximum; because adaptive sizing 1878 // is turned on below, the actual space used may be smaller. 1879 1880 initHeapSize = MIN2(total_memory / (julong) 2, 1881 total_memory - (julong) 160 * M); 1882 1883 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1884 1885 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1886 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1887 return JNI_EINVAL; 1888 } 1889 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1890 return JNI_EINVAL; 1891 } 1892 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1893 return JNI_EINVAL; 1894 } 1895 } 1896 if (FLAG_IS_DEFAULT(NewSize)) { 1897 // Make the young generation 3/8ths of the total heap. 1898 if (FLAG_SET_CMDLINE(NewSize, 1899 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1900 return JNI_EINVAL; 1901 } 1902 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1903 return JNI_EINVAL; 1904 } 1905 } 1906 1907 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1908 FLAG_SET_DEFAULT(UseLargePages, true); 1909 #endif 1910 1911 // Increase some data structure sizes for efficiency 1912 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1913 return JNI_EINVAL; 1914 } 1915 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1916 return JNI_EINVAL; 1917 } 1918 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1919 return JNI_EINVAL; 1920 } 1921 1922 // See the OldPLABSize comment below, but replace 'after promotion' 1923 // with 'after copying'. YoungPLABSize is the size of the survivor 1924 // space per-gc-thread buffers. The default is 4kw. 1925 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1926 return JNI_EINVAL; 1927 } 1928 1929 // OldPLABSize is the size of the buffers in the old gen that 1930 // UseParallelGC uses to promote live data that doesn't fit in the 1931 // survivor spaces. At any given time, there's one for each gc thread. 1932 // The default size is 1kw. These buffers are rarely used, since the 1933 // survivor spaces are usually big enough. For specjbb, however, there 1934 // are occasions when there's lots of live data in the young gen 1935 // and we end up promoting some of it. We don't have a definite 1936 // explanation for why bumping OldPLABSize helps, but the theory 1937 // is that a bigger PLAB results in retaining something like the 1938 // original allocation order after promotion, which improves mutator 1939 // locality. A minor effect may be that larger PLABs reduce the 1940 // number of PLAB allocation events during gc. The value of 8kw 1941 // was arrived at by experimenting with specjbb. 1942 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1943 return JNI_EINVAL; 1944 } 1945 1946 // Enable parallel GC and adaptive generation sizing 1947 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1948 return JNI_EINVAL; 1949 } 1950 1951 // Encourage steady state memory management 1952 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1953 return JNI_EINVAL; 1954 } 1955 1956 // This appears to improve mutator locality 1957 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1958 return JNI_EINVAL; 1959 } 1960 1961 return JNI_OK; 1962 } 1963 1964 // This must be called after ergonomics. 1965 void Arguments::set_bytecode_flags() { 1966 if (!RewriteBytecodes) { 1967 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1968 } 1969 } 1970 1971 // Aggressive optimization flags 1972 jint Arguments::set_aggressive_opts_flags() { 1973 #ifdef COMPILER2 1974 if (AggressiveUnboxing) { 1975 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1976 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1977 } else if (!EliminateAutoBox) { 1978 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1979 AggressiveUnboxing = false; 1980 } 1981 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1982 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1983 } else if (!DoEscapeAnalysis) { 1984 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1985 AggressiveUnboxing = false; 1986 } 1987 } 1988 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1989 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1990 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1991 } 1992 // Feed the cache size setting into the JDK 1993 char buffer[1024]; 1994 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1995 if (!add_property(buffer)) { 1996 return JNI_ENOMEM; 1997 } 1998 } 1999 #endif 2000 2001 return JNI_OK; 2002 } 2003 2004 //=========================================================================================================== 2005 // Parsing of java.compiler property 2006 2007 void Arguments::process_java_compiler_argument(const char* arg) { 2008 // For backwards compatibility, Djava.compiler=NONE or "" 2009 // causes us to switch to -Xint mode UNLESS -Xdebug 2010 // is also specified. 2011 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2012 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2013 } 2014 } 2015 2016 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2017 _sun_java_launcher = os::strdup_check_oom(launcher); 2018 } 2019 2020 bool Arguments::created_by_java_launcher() { 2021 assert(_sun_java_launcher != NULL, "property must have value"); 2022 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2023 } 2024 2025 bool Arguments::sun_java_launcher_is_altjvm() { 2026 return _sun_java_launcher_is_altjvm; 2027 } 2028 2029 //=========================================================================================================== 2030 // Parsing of main arguments 2031 2032 unsigned int addreads_count = 0; 2033 unsigned int addexports_count = 0; 2034 unsigned int addopens_count = 0; 2035 unsigned int addmods_count = 0; 2036 unsigned int patch_mod_count = 0; 2037 2038 // Check the consistency of vm_init_args 2039 bool Arguments::check_vm_args_consistency() { 2040 // Method for adding checks for flag consistency. 2041 // The intent is to warn the user of all possible conflicts, 2042 // before returning an error. 2043 // Note: Needs platform-dependent factoring. 2044 bool status = true; 2045 2046 if (TLABRefillWasteFraction == 0) { 2047 jio_fprintf(defaultStream::error_stream(), 2048 "TLABRefillWasteFraction should be a denominator, " 2049 "not " SIZE_FORMAT "\n", 2050 TLABRefillWasteFraction); 2051 status = false; 2052 } 2053 2054 if (PrintNMTStatistics) { 2055 #if INCLUDE_NMT 2056 if (MemTracker::tracking_level() == NMT_off) { 2057 #endif // INCLUDE_NMT 2058 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2059 PrintNMTStatistics = false; 2060 #if INCLUDE_NMT 2061 } 2062 #endif 2063 } 2064 2065 status = CompilerConfig::check_args_consistency(status); 2066 #if INCLUDE_JVMCI 2067 if (status && EnableJVMCI) { 2068 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2069 AddProperty, UnwriteableProperty, InternalProperty); 2070 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2071 return false; 2072 } 2073 } 2074 #endif 2075 2076 #ifndef SUPPORT_RESERVED_STACK_AREA 2077 if (StackReservedPages != 0) { 2078 FLAG_SET_CMDLINE(StackReservedPages, 0); 2079 warning("Reserved Stack Area not supported on this platform"); 2080 } 2081 #endif 2082 2083 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2084 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2085 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2086 } 2087 } 2088 2089 status = status && GCArguments::check_args_consistency(); 2090 2091 return status; 2092 } 2093 2094 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2095 const char* option_type) { 2096 if (ignore) return false; 2097 2098 const char* spacer = " "; 2099 if (option_type == NULL) { 2100 option_type = ++spacer; // Set both to the empty string. 2101 } 2102 2103 jio_fprintf(defaultStream::error_stream(), 2104 "Unrecognized %s%soption: %s\n", option_type, spacer, 2105 option->optionString); 2106 return true; 2107 } 2108 2109 static const char* user_assertion_options[] = { 2110 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2111 }; 2112 2113 static const char* system_assertion_options[] = { 2114 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2115 }; 2116 2117 bool Arguments::parse_uintx(const char* value, 2118 uintx* uintx_arg, 2119 uintx min_size) { 2120 2121 // Check the sign first since atojulong() parses only unsigned values. 2122 bool value_is_positive = !(*value == '-'); 2123 2124 if (value_is_positive) { 2125 julong n; 2126 bool good_return = atojulong(value, &n); 2127 if (good_return) { 2128 bool above_minimum = n >= min_size; 2129 bool value_is_too_large = n > max_uintx; 2130 2131 if (above_minimum && !value_is_too_large) { 2132 *uintx_arg = n; 2133 return true; 2134 } 2135 } 2136 } 2137 return false; 2138 } 2139 2140 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2141 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2142 char* property = AllocateHeap(prop_len, mtArguments); 2143 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2144 if (ret < 0 || ret >= (int)prop_len) { 2145 FreeHeap(property); 2146 return false; 2147 } 2148 bool added = add_property(property, UnwriteableProperty, internal); 2149 FreeHeap(property); 2150 return added; 2151 } 2152 2153 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2154 const unsigned int props_count_limit = 1000; 2155 const int max_digits = 3; 2156 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2157 2158 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2159 if (count < props_count_limit) { 2160 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2161 char* property = AllocateHeap(prop_len, mtArguments); 2162 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2163 if (ret < 0 || ret >= (int)prop_len) { 2164 FreeHeap(property); 2165 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2166 return false; 2167 } 2168 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2169 FreeHeap(property); 2170 return added; 2171 } 2172 2173 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2174 return false; 2175 } 2176 2177 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2178 julong* long_arg, 2179 julong min_size, 2180 julong max_size) { 2181 if (!atojulong(s, long_arg)) return arg_unreadable; 2182 return check_memory_size(*long_arg, min_size, max_size); 2183 } 2184 2185 // Parse JavaVMInitArgs structure 2186 2187 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2188 const JavaVMInitArgs *java_options_args, 2189 const JavaVMInitArgs *cmd_line_args) { 2190 bool patch_mod_javabase = false; 2191 2192 // Save default settings for some mode flags 2193 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2194 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2195 Arguments::_ClipInlining = ClipInlining; 2196 Arguments::_BackgroundCompilation = BackgroundCompilation; 2197 if (TieredCompilation) { 2198 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2199 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2200 } 2201 2202 // Setup flags for mixed which is the default 2203 set_mode_flags(_mixed); 2204 2205 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2206 // variable (if present). 2207 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2208 if (result != JNI_OK) { 2209 return result; 2210 } 2211 2212 // Parse args structure generated from the command line flags. 2213 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE); 2214 if (result != JNI_OK) { 2215 return result; 2216 } 2217 2218 // Parse args structure generated from the _JAVA_OPTIONS environment 2219 // variable (if present) (mimics classic VM) 2220 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2221 if (result != JNI_OK) { 2222 return result; 2223 } 2224 2225 // We need to ensure processor and memory resources have been properly 2226 // configured - which may rely on arguments we just processed - before 2227 // doing the final argument processing. Any argument processing that 2228 // needs to know about processor and memory resources must occur after 2229 // this point. 2230 2231 os::init_container_support(); 2232 2233 // Do final processing now that all arguments have been parsed 2234 result = finalize_vm_init_args(patch_mod_javabase); 2235 if (result != JNI_OK) { 2236 return result; 2237 } 2238 2239 return JNI_OK; 2240 } 2241 2242 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2243 // represents a valid JDWP agent. is_path==true denotes that we 2244 // are dealing with -agentpath (case where name is a path), otherwise with 2245 // -agentlib 2246 bool valid_jdwp_agent(char *name, bool is_path) { 2247 char *_name; 2248 const char *_jdwp = "jdwp"; 2249 size_t _len_jdwp, _len_prefix; 2250 2251 if (is_path) { 2252 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2253 return false; 2254 } 2255 2256 _name++; // skip past last path separator 2257 _len_prefix = strlen(JNI_LIB_PREFIX); 2258 2259 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2260 return false; 2261 } 2262 2263 _name += _len_prefix; 2264 _len_jdwp = strlen(_jdwp); 2265 2266 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2267 _name += _len_jdwp; 2268 } 2269 else { 2270 return false; 2271 } 2272 2273 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2274 return false; 2275 } 2276 2277 return true; 2278 } 2279 2280 if (strcmp(name, _jdwp) == 0) { 2281 return true; 2282 } 2283 2284 return false; 2285 } 2286 2287 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2288 // --patch-module=<module>=<file>(<pathsep><file>)* 2289 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2290 // Find the equal sign between the module name and the path specification 2291 const char* module_equal = strchr(patch_mod_tail, '='); 2292 if (module_equal == NULL) { 2293 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2294 return JNI_ERR; 2295 } else { 2296 // Pick out the module name 2297 size_t module_len = module_equal - patch_mod_tail; 2298 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2299 if (module_name != NULL) { 2300 memcpy(module_name, patch_mod_tail, module_len); 2301 *(module_name + module_len) = '\0'; 2302 // The path piece begins one past the module_equal sign 2303 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2304 FREE_C_HEAP_ARRAY(char, module_name); 2305 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2306 return JNI_ENOMEM; 2307 } 2308 } else { 2309 return JNI_ENOMEM; 2310 } 2311 } 2312 return JNI_OK; 2313 } 2314 2315 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2316 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2317 // The min and max sizes match the values in globals.hpp, but scaled 2318 // with K. The values have been chosen so that alignment with page 2319 // size doesn't change the max value, which makes the conversions 2320 // back and forth between Xss value and ThreadStackSize value easier. 2321 // The values have also been chosen to fit inside a 32-bit signed type. 2322 const julong min_ThreadStackSize = 0; 2323 const julong max_ThreadStackSize = 1 * M; 2324 2325 const julong min_size = min_ThreadStackSize * K; 2326 const julong max_size = max_ThreadStackSize * K; 2327 2328 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2329 2330 julong size = 0; 2331 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2332 if (errcode != arg_in_range) { 2333 bool silent = (option == NULL); // Allow testing to silence error messages 2334 if (!silent) { 2335 jio_fprintf(defaultStream::error_stream(), 2336 "Invalid thread stack size: %s\n", option->optionString); 2337 describe_range_error(errcode); 2338 } 2339 return JNI_EINVAL; 2340 } 2341 2342 // Internally track ThreadStackSize in units of 1024 bytes. 2343 const julong size_aligned = align_up(size, K); 2344 assert(size <= size_aligned, 2345 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2346 size, size_aligned); 2347 2348 const julong size_in_K = size_aligned / K; 2349 assert(size_in_K < (julong)max_intx, 2350 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2351 size_in_K); 2352 2353 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2354 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2355 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2356 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2357 max_expanded, size_in_K); 2358 2359 *out_ThreadStackSize = (intx)size_in_K; 2360 2361 return JNI_OK; 2362 } 2363 2364 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) { 2365 // For match_option to return remaining or value part of option string 2366 const char* tail; 2367 2368 // iterate over arguments 2369 for (int index = 0; index < args->nOptions; index++) { 2370 bool is_absolute_path = false; // for -agentpath vs -agentlib 2371 2372 const JavaVMOption* option = args->options + index; 2373 2374 if (!match_option(option, "-Djava.class.path", &tail) && 2375 !match_option(option, "-Dsun.java.command", &tail) && 2376 !match_option(option, "-Dsun.java.launcher", &tail)) { 2377 2378 // add all jvm options to the jvm_args string. This string 2379 // is used later to set the java.vm.args PerfData string constant. 2380 // the -Djava.class.path and the -Dsun.java.command options are 2381 // omitted from jvm_args string as each have their own PerfData 2382 // string constant object. 2383 build_jvm_args(option->optionString); 2384 } 2385 2386 // -verbose:[class/module/gc/jni] 2387 if (match_option(option, "-verbose", &tail)) { 2388 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2389 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2390 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2391 } else if (!strcmp(tail, ":module")) { 2392 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2393 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2394 } else if (!strcmp(tail, ":gc")) { 2395 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2396 } else if (!strcmp(tail, ":jni")) { 2397 if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) { 2398 return JNI_EINVAL; 2399 } 2400 } 2401 // -da / -ea / -disableassertions / -enableassertions 2402 // These accept an optional class/package name separated by a colon, e.g., 2403 // -da:java.lang.Thread. 2404 } else if (match_option(option, user_assertion_options, &tail, true)) { 2405 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2406 if (*tail == '\0') { 2407 JavaAssertions::setUserClassDefault(enable); 2408 } else { 2409 assert(*tail == ':', "bogus match by match_option()"); 2410 JavaAssertions::addOption(tail + 1, enable); 2411 } 2412 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2413 } else if (match_option(option, system_assertion_options, &tail, false)) { 2414 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2415 JavaAssertions::setSystemClassDefault(enable); 2416 // -bootclasspath: 2417 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2418 jio_fprintf(defaultStream::output_stream(), 2419 "-Xbootclasspath is no longer a supported option.\n"); 2420 return JNI_EINVAL; 2421 // -bootclasspath/a: 2422 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2423 Arguments::append_sysclasspath(tail); 2424 // -bootclasspath/p: 2425 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2426 jio_fprintf(defaultStream::output_stream(), 2427 "-Xbootclasspath/p is no longer a supported option.\n"); 2428 return JNI_EINVAL; 2429 // -Xrun 2430 } else if (match_option(option, "-Xrun", &tail)) { 2431 if (tail != NULL) { 2432 const char* pos = strchr(tail, ':'); 2433 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2434 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2435 jio_snprintf(name, len + 1, "%s", tail); 2436 2437 char *options = NULL; 2438 if(pos != NULL) { 2439 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2440 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2441 } 2442 #if !INCLUDE_JVMTI 2443 if (strcmp(name, "jdwp") == 0) { 2444 jio_fprintf(defaultStream::error_stream(), 2445 "Debugging agents are not supported in this VM\n"); 2446 return JNI_ERR; 2447 } 2448 #endif // !INCLUDE_JVMTI 2449 add_init_library(name, options); 2450 } 2451 } else if (match_option(option, "--add-reads=", &tail)) { 2452 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2453 return JNI_ENOMEM; 2454 } 2455 } else if (match_option(option, "--add-exports=", &tail)) { 2456 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2457 return JNI_ENOMEM; 2458 } 2459 } else if (match_option(option, "--add-opens=", &tail)) { 2460 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2461 return JNI_ENOMEM; 2462 } 2463 } else if (match_option(option, "--add-modules=", &tail)) { 2464 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2465 return JNI_ENOMEM; 2466 } 2467 } else if (match_option(option, "--limit-modules=", &tail)) { 2468 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2469 return JNI_ENOMEM; 2470 } 2471 } else if (match_option(option, "--module-path=", &tail)) { 2472 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2473 return JNI_ENOMEM; 2474 } 2475 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2476 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2477 return JNI_ENOMEM; 2478 } 2479 } else if (match_option(option, "--patch-module=", &tail)) { 2480 // --patch-module=<module>=<file>(<pathsep><file>)* 2481 int res = process_patch_mod_option(tail, patch_mod_javabase); 2482 if (res != JNI_OK) { 2483 return res; 2484 } 2485 } else if (match_option(option, "--illegal-access=", &tail)) { 2486 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2487 return JNI_ENOMEM; 2488 } 2489 // -agentlib and -agentpath 2490 } else if (match_option(option, "-agentlib:", &tail) || 2491 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2492 if(tail != NULL) { 2493 const char* pos = strchr(tail, '='); 2494 char* name; 2495 if (pos == NULL) { 2496 name = os::strdup_check_oom(tail, mtArguments); 2497 } else { 2498 size_t len = pos - tail; 2499 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2500 memcpy(name, tail, len); 2501 name[len] = '\0'; 2502 } 2503 2504 char *options = NULL; 2505 if(pos != NULL) { 2506 options = os::strdup_check_oom(pos + 1, mtArguments); 2507 } 2508 #if !INCLUDE_JVMTI 2509 if (valid_jdwp_agent(name, is_absolute_path)) { 2510 jio_fprintf(defaultStream::error_stream(), 2511 "Debugging agents are not supported in this VM\n"); 2512 return JNI_ERR; 2513 } 2514 #endif // !INCLUDE_JVMTI 2515 add_init_agent(name, options, is_absolute_path); 2516 } 2517 // -javaagent 2518 } else if (match_option(option, "-javaagent:", &tail)) { 2519 #if !INCLUDE_JVMTI 2520 jio_fprintf(defaultStream::error_stream(), 2521 "Instrumentation agents are not supported in this VM\n"); 2522 return JNI_ERR; 2523 #else 2524 if (tail != NULL) { 2525 size_t length = strlen(tail) + 1; 2526 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2527 jio_snprintf(options, length, "%s", tail); 2528 add_instrument_agent("instrument", options, false); 2529 // java agents need module java.instrument 2530 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2531 return JNI_ENOMEM; 2532 } 2533 } 2534 #endif // !INCLUDE_JVMTI 2535 // --enable_preview 2536 } else if (match_option(option, "--enable-preview")) { 2537 set_enable_preview(); 2538 // -Xnoclassgc 2539 } else if (match_option(option, "-Xnoclassgc")) { 2540 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2541 return JNI_EINVAL; 2542 } 2543 // -Xconcgc 2544 } else if (match_option(option, "-Xconcgc")) { 2545 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) { 2546 return JNI_EINVAL; 2547 } 2548 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2549 // -Xnoconcgc 2550 } else if (match_option(option, "-Xnoconcgc")) { 2551 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) { 2552 return JNI_EINVAL; 2553 } 2554 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2555 // -Xbatch 2556 } else if (match_option(option, "-Xbatch")) { 2557 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2558 return JNI_EINVAL; 2559 } 2560 // -Xmn for compatibility with other JVM vendors 2561 } else if (match_option(option, "-Xmn", &tail)) { 2562 julong long_initial_young_size = 0; 2563 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2564 if (errcode != arg_in_range) { 2565 jio_fprintf(defaultStream::error_stream(), 2566 "Invalid initial young generation size: %s\n", option->optionString); 2567 describe_range_error(errcode); 2568 return JNI_EINVAL; 2569 } 2570 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2571 return JNI_EINVAL; 2572 } 2573 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2574 return JNI_EINVAL; 2575 } 2576 // -Xms 2577 } else if (match_option(option, "-Xms", &tail)) { 2578 julong size = 0; 2579 // an initial heap size of 0 means automatically determine 2580 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2581 if (errcode != arg_in_range) { 2582 jio_fprintf(defaultStream::error_stream(), 2583 "Invalid initial heap size: %s\n", option->optionString); 2584 describe_range_error(errcode); 2585 return JNI_EINVAL; 2586 } 2587 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2588 return JNI_EINVAL; 2589 } 2590 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2591 return JNI_EINVAL; 2592 } 2593 // -Xmx 2594 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2595 julong long_max_heap_size = 0; 2596 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2597 if (errcode != arg_in_range) { 2598 jio_fprintf(defaultStream::error_stream(), 2599 "Invalid maximum heap size: %s\n", option->optionString); 2600 describe_range_error(errcode); 2601 return JNI_EINVAL; 2602 } 2603 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2604 return JNI_EINVAL; 2605 } 2606 // Xmaxf 2607 } else if (match_option(option, "-Xmaxf", &tail)) { 2608 char* err; 2609 int maxf = (int)(strtod(tail, &err) * 100); 2610 if (*err != '\0' || *tail == '\0') { 2611 jio_fprintf(defaultStream::error_stream(), 2612 "Bad max heap free percentage size: %s\n", 2613 option->optionString); 2614 return JNI_EINVAL; 2615 } else { 2616 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2617 return JNI_EINVAL; 2618 } 2619 } 2620 // Xminf 2621 } else if (match_option(option, "-Xminf", &tail)) { 2622 char* err; 2623 int minf = (int)(strtod(tail, &err) * 100); 2624 if (*err != '\0' || *tail == '\0') { 2625 jio_fprintf(defaultStream::error_stream(), 2626 "Bad min heap free percentage size: %s\n", 2627 option->optionString); 2628 return JNI_EINVAL; 2629 } else { 2630 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2631 return JNI_EINVAL; 2632 } 2633 } 2634 // -Xss 2635 } else if (match_option(option, "-Xss", &tail)) { 2636 intx value = 0; 2637 jint err = parse_xss(option, tail, &value); 2638 if (err != JNI_OK) { 2639 return err; 2640 } 2641 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2642 return JNI_EINVAL; 2643 } 2644 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2645 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2646 julong long_ReservedCodeCacheSize = 0; 2647 2648 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2649 if (errcode != arg_in_range) { 2650 jio_fprintf(defaultStream::error_stream(), 2651 "Invalid maximum code cache size: %s.\n", option->optionString); 2652 return JNI_EINVAL; 2653 } 2654 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2655 return JNI_EINVAL; 2656 } 2657 // -green 2658 } else if (match_option(option, "-green")) { 2659 jio_fprintf(defaultStream::error_stream(), 2660 "Green threads support not available\n"); 2661 return JNI_EINVAL; 2662 // -native 2663 } else if (match_option(option, "-native")) { 2664 // HotSpot always uses native threads, ignore silently for compatibility 2665 // -Xrs 2666 } else if (match_option(option, "-Xrs")) { 2667 // Classic/EVM option, new functionality 2668 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2669 return JNI_EINVAL; 2670 } 2671 // -Xprof 2672 } else if (match_option(option, "-Xprof")) { 2673 char version[256]; 2674 // Obsolete in JDK 10 2675 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2676 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2677 // -Xinternalversion 2678 } else if (match_option(option, "-Xinternalversion")) { 2679 jio_fprintf(defaultStream::output_stream(), "%s\n", 2680 VM_Version::internal_vm_info_string()); 2681 vm_exit(0); 2682 #ifndef PRODUCT 2683 // -Xprintflags 2684 } else if (match_option(option, "-Xprintflags")) { 2685 JVMFlag::printFlags(tty, false); 2686 vm_exit(0); 2687 #endif 2688 // -D 2689 } else if (match_option(option, "-D", &tail)) { 2690 const char* value; 2691 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2692 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2693 // abort if -Djava.endorsed.dirs is set 2694 jio_fprintf(defaultStream::output_stream(), 2695 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2696 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2697 return JNI_EINVAL; 2698 } 2699 if (match_option(option, "-Djava.ext.dirs=", &value) && 2700 *value != '\0' && strcmp(value, "\"\"") != 0) { 2701 // abort if -Djava.ext.dirs is set 2702 jio_fprintf(defaultStream::output_stream(), 2703 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2704 return JNI_EINVAL; 2705 } 2706 // Check for module related properties. They must be set using the modules 2707 // options. For example: use "--add-modules=java.sql", not 2708 // "-Djdk.module.addmods=java.sql" 2709 if (is_internal_module_property(option->optionString + 2)) { 2710 needs_module_property_warning = true; 2711 continue; 2712 } 2713 2714 if (!add_property(tail)) { 2715 return JNI_ENOMEM; 2716 } 2717 // Out of the box management support 2718 if (match_option(option, "-Dcom.sun.management", &tail)) { 2719 #if INCLUDE_MANAGEMENT 2720 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2721 return JNI_EINVAL; 2722 } 2723 // management agent in module jdk.management.agent 2724 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2725 return JNI_ENOMEM; 2726 } 2727 #else 2728 jio_fprintf(defaultStream::output_stream(), 2729 "-Dcom.sun.management is not supported in this VM.\n"); 2730 return JNI_ERR; 2731 #endif 2732 } 2733 // -Xint 2734 } else if (match_option(option, "-Xint")) { 2735 set_mode_flags(_int); 2736 // -Xmixed 2737 } else if (match_option(option, "-Xmixed")) { 2738 set_mode_flags(_mixed); 2739 // -Xcomp 2740 } else if (match_option(option, "-Xcomp")) { 2741 // for testing the compiler; turn off all flags that inhibit compilation 2742 set_mode_flags(_comp); 2743 // -Xshare:dump 2744 } else if (match_option(option, "-Xshare:dump")) { 2745 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) { 2746 return JNI_EINVAL; 2747 } 2748 // -Xshare:on 2749 } else if (match_option(option, "-Xshare:on")) { 2750 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2751 return JNI_EINVAL; 2752 } 2753 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2754 return JNI_EINVAL; 2755 } 2756 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2757 } else if (match_option(option, "-Xshare:auto")) { 2758 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2759 return JNI_EINVAL; 2760 } 2761 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2762 return JNI_EINVAL; 2763 } 2764 // -Xshare:off 2765 } else if (match_option(option, "-Xshare:off")) { 2766 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) { 2767 return JNI_EINVAL; 2768 } 2769 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2770 return JNI_EINVAL; 2771 } 2772 // -Xverify 2773 } else if (match_option(option, "-Xverify", &tail)) { 2774 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2775 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2776 return JNI_EINVAL; 2777 } 2778 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2779 return JNI_EINVAL; 2780 } 2781 } else if (strcmp(tail, ":remote") == 0) { 2782 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != 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, ":none") == 0) { 2789 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2790 return JNI_EINVAL; 2791 } 2792 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2793 return JNI_EINVAL; 2794 } 2795 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2796 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2797 return JNI_EINVAL; 2798 } 2799 // -Xdebug 2800 } else if (match_option(option, "-Xdebug")) { 2801 // note this flag has been used, then ignore 2802 set_xdebug_mode(true); 2803 // -Xnoagent 2804 } else if (match_option(option, "-Xnoagent")) { 2805 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2806 } else if (match_option(option, "-Xloggc:", &tail)) { 2807 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2808 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2809 _gc_log_filename = os::strdup_check_oom(tail); 2810 } else if (match_option(option, "-Xlog", &tail)) { 2811 bool ret = false; 2812 if (strcmp(tail, ":help") == 0) { 2813 fileStream stream(defaultStream::output_stream()); 2814 LogConfiguration::print_command_line_help(&stream); 2815 vm_exit(0); 2816 } else if (strcmp(tail, ":disable") == 0) { 2817 LogConfiguration::disable_logging(); 2818 ret = true; 2819 } else if (*tail == '\0') { 2820 ret = LogConfiguration::parse_command_line_arguments(); 2821 assert(ret, "-Xlog without arguments should never fail to parse"); 2822 } else if (*tail == ':') { 2823 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2824 } 2825 if (ret == false) { 2826 jio_fprintf(defaultStream::error_stream(), 2827 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2828 tail); 2829 return JNI_EINVAL; 2830 } 2831 // JNI hooks 2832 } else if (match_option(option, "-Xcheck", &tail)) { 2833 if (!strcmp(tail, ":jni")) { 2834 #if !INCLUDE_JNI_CHECK 2835 warning("JNI CHECKING is not supported in this VM"); 2836 #else 2837 CheckJNICalls = true; 2838 #endif // INCLUDE_JNI_CHECK 2839 } else if (is_bad_option(option, args->ignoreUnrecognized, 2840 "check")) { 2841 return JNI_EINVAL; 2842 } 2843 } else if (match_option(option, "vfprintf")) { 2844 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2845 } else if (match_option(option, "exit")) { 2846 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2847 } else if (match_option(option, "abort")) { 2848 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2849 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2850 // and the last option wins. 2851 } else if (match_option(option, "-XX:+NeverTenure")) { 2852 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2853 return JNI_EINVAL; 2854 } 2855 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2856 return JNI_EINVAL; 2857 } 2858 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2859 return JNI_EINVAL; 2860 } 2861 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2862 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2863 return JNI_EINVAL; 2864 } 2865 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2866 return JNI_EINVAL; 2867 } 2868 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2869 return JNI_EINVAL; 2870 } 2871 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2872 uintx max_tenuring_thresh = 0; 2873 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2874 jio_fprintf(defaultStream::error_stream(), 2875 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2876 return JNI_EINVAL; 2877 } 2878 2879 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2880 return JNI_EINVAL; 2881 } 2882 2883 if (MaxTenuringThreshold == 0) { 2884 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2885 return JNI_EINVAL; 2886 } 2887 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2888 return JNI_EINVAL; 2889 } 2890 } else { 2891 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2892 return JNI_EINVAL; 2893 } 2894 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2895 return JNI_EINVAL; 2896 } 2897 } 2898 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2899 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2900 return JNI_EINVAL; 2901 } 2902 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2903 return JNI_EINVAL; 2904 } 2905 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2906 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2907 return JNI_EINVAL; 2908 } 2909 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2910 return JNI_EINVAL; 2911 } 2912 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2913 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2914 return JNI_EINVAL; 2915 } 2916 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2917 return JNI_EINVAL; 2918 } 2919 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2920 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2921 return JNI_EINVAL; 2922 } 2923 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2924 return JNI_EINVAL; 2925 } 2926 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 2927 #if defined(DTRACE_ENABLED) 2928 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 2929 return JNI_EINVAL; 2930 } 2931 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 2932 return JNI_EINVAL; 2933 } 2934 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 2935 return JNI_EINVAL; 2936 } 2937 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 2938 return JNI_EINVAL; 2939 } 2940 #else // defined(DTRACE_ENABLED) 2941 jio_fprintf(defaultStream::error_stream(), 2942 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2943 return JNI_EINVAL; 2944 #endif // defined(DTRACE_ENABLED) 2945 #ifdef ASSERT 2946 } else if (match_option(option, "-XX:+FullGCALot")) { 2947 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2948 return JNI_EINVAL; 2949 } 2950 // disable scavenge before parallel mark-compact 2951 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2952 return JNI_EINVAL; 2953 } 2954 #endif 2955 #if !INCLUDE_MANAGEMENT 2956 } else if (match_option(option, "-XX:+ManagementServer")) { 2957 jio_fprintf(defaultStream::error_stream(), 2958 "ManagementServer is not supported in this VM.\n"); 2959 return JNI_ERR; 2960 #endif // INCLUDE_MANAGEMENT 2961 #if INCLUDE_JFR 2962 } else if (match_jfr_option(&option)) { 2963 return JNI_EINVAL; 2964 #endif 2965 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2966 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2967 // already been handled 2968 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2969 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2970 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2971 return JNI_EINVAL; 2972 } 2973 } 2974 // Unknown option 2975 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2976 return JNI_ERR; 2977 } 2978 } 2979 2980 // PrintSharedArchiveAndExit will turn on 2981 // -Xshare:on 2982 // -Xlog:class+path=info 2983 if (PrintSharedArchiveAndExit) { 2984 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2985 return JNI_EINVAL; 2986 } 2987 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2988 return JNI_EINVAL; 2989 } 2990 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2991 } 2992 2993 fix_appclasspath(); 2994 2995 return JNI_OK; 2996 } 2997 2998 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 2999 // For java.base check for duplicate --patch-module options being specified on the command line. 3000 // This check is only required for java.base, all other duplicate module specifications 3001 // will be checked during module system initialization. The module system initialization 3002 // will throw an ExceptionInInitializerError if this situation occurs. 3003 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3004 if (*patch_mod_javabase) { 3005 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3006 } else { 3007 *patch_mod_javabase = true; 3008 } 3009 } 3010 3011 // Create GrowableArray lazily, only if --patch-module has been specified 3012 if (_patch_mod_prefix == NULL) { 3013 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3014 } 3015 3016 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3017 } 3018 3019 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3020 // 3021 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3022 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3023 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3024 // path is treated as the current directory. 3025 // 3026 // This causes problems with CDS, which requires that all directories specified in the classpath 3027 // must be empty. In most cases, applications do NOT want to load classes from the current 3028 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3029 // scripts compatible with CDS. 3030 void Arguments::fix_appclasspath() { 3031 if (IgnoreEmptyClassPaths) { 3032 const char separator = *os::path_separator(); 3033 const char* src = _java_class_path->value(); 3034 3035 // skip over all the leading empty paths 3036 while (*src == separator) { 3037 src ++; 3038 } 3039 3040 char* copy = os::strdup_check_oom(src, mtArguments); 3041 3042 // trim all trailing empty paths 3043 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3044 *tail = '\0'; 3045 } 3046 3047 char from[3] = {separator, separator, '\0'}; 3048 char to [2] = {separator, '\0'}; 3049 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3050 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3051 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3052 } 3053 3054 _java_class_path->set_writeable_value(copy); 3055 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3056 } 3057 } 3058 3059 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3060 // check if the default lib/endorsed directory exists; if so, error 3061 char path[JVM_MAXPATHLEN]; 3062 const char* fileSep = os::file_separator(); 3063 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3064 3065 DIR* dir = os::opendir(path); 3066 if (dir != NULL) { 3067 jio_fprintf(defaultStream::output_stream(), 3068 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3069 "in modular form will be supported via the concept of upgradeable modules.\n"); 3070 os::closedir(dir); 3071 return JNI_ERR; 3072 } 3073 3074 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3075 dir = os::opendir(path); 3076 if (dir != NULL) { 3077 jio_fprintf(defaultStream::output_stream(), 3078 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3079 "Use -classpath instead.\n."); 3080 os::closedir(dir); 3081 return JNI_ERR; 3082 } 3083 3084 // This must be done after all arguments have been processed 3085 // and the container support has been initialized since AggressiveHeap 3086 // relies on the amount of total memory available. 3087 if (AggressiveHeap) { 3088 jint result = set_aggressive_heap_flags(); 3089 if (result != JNI_OK) { 3090 return result; 3091 } 3092 } 3093 3094 // This must be done after all arguments have been processed. 3095 // java_compiler() true means set to "NONE" or empty. 3096 if (java_compiler() && !xdebug_mode()) { 3097 // For backwards compatibility, we switch to interpreted mode if 3098 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3099 // not specified. 3100 set_mode_flags(_int); 3101 } 3102 3103 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3104 // but like -Xint, leave compilation thresholds unaffected. 3105 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3106 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3107 set_mode_flags(_int); 3108 } 3109 3110 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3111 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3112 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3113 } 3114 3115 #if !COMPILER2_OR_JVMCI 3116 // Don't degrade server performance for footprint 3117 if (FLAG_IS_DEFAULT(UseLargePages) && 3118 MaxHeapSize < LargePageHeapSizeThreshold) { 3119 // No need for large granularity pages w/small heaps. 3120 // Note that large pages are enabled/disabled for both the 3121 // Java heap and the code cache. 3122 FLAG_SET_DEFAULT(UseLargePages, false); 3123 } 3124 3125 UNSUPPORTED_OPTION(ProfileInterpreter); 3126 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3127 #endif 3128 3129 #ifndef TIERED 3130 // Tiered compilation is undefined. 3131 UNSUPPORTED_OPTION(TieredCompilation); 3132 #endif 3133 3134 if (!check_vm_args_consistency()) { 3135 return JNI_ERR; 3136 } 3137 3138 #if INCLUDE_CDS 3139 if (DumpSharedSpaces) { 3140 // Disable biased locking now as it interferes with the clean up of 3141 // the archived Klasses and Java string objects (at dump time only). 3142 UseBiasedLocking = false; 3143 3144 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3145 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable 3146 // compiler just to be safe. 3147 // 3148 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata 3149 // instead of modifying them in place. The copy is inaccessible to the compiler. 3150 // TODO: revisit the following for the static archive case. 3151 set_mode_flags(_int); 3152 } 3153 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) { 3154 // Always verify non-system classes during CDS dump 3155 if (!BytecodeVerificationRemote) { 3156 BytecodeVerificationRemote = true; 3157 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3158 } 3159 } 3160 if (ArchiveClassesAtExit == NULL) { 3161 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false); 3162 } 3163 if (UseSharedSpaces && patch_mod_javabase) { 3164 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3165 } 3166 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3167 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3168 } 3169 #endif 3170 3171 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3172 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3173 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3174 3175 return JNI_OK; 3176 } 3177 3178 // Helper class for controlling the lifetime of JavaVMInitArgs 3179 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3180 // deleted on the destruction of the ScopedVMInitArgs object. 3181 class ScopedVMInitArgs : public StackObj { 3182 private: 3183 JavaVMInitArgs _args; 3184 char* _container_name; 3185 bool _is_set; 3186 char* _vm_options_file_arg; 3187 3188 public: 3189 ScopedVMInitArgs(const char *container_name) { 3190 _args.version = JNI_VERSION_1_2; 3191 _args.nOptions = 0; 3192 _args.options = NULL; 3193 _args.ignoreUnrecognized = false; 3194 _container_name = (char *)container_name; 3195 _is_set = false; 3196 _vm_options_file_arg = NULL; 3197 } 3198 3199 // Populates the JavaVMInitArgs object represented by this 3200 // ScopedVMInitArgs object with the arguments in options. The 3201 // allocated memory is deleted by the destructor. If this method 3202 // returns anything other than JNI_OK, then this object is in a 3203 // partially constructed state, and should be abandoned. 3204 jint set_args(GrowableArray<JavaVMOption>* options) { 3205 _is_set = true; 3206 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3207 JavaVMOption, options->length(), mtArguments); 3208 if (options_arr == NULL) { 3209 return JNI_ENOMEM; 3210 } 3211 _args.options = options_arr; 3212 3213 for (int i = 0; i < options->length(); i++) { 3214 options_arr[i] = options->at(i); 3215 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3216 if (options_arr[i].optionString == NULL) { 3217 // Rely on the destructor to do cleanup. 3218 _args.nOptions = i; 3219 return JNI_ENOMEM; 3220 } 3221 } 3222 3223 _args.nOptions = options->length(); 3224 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3225 return JNI_OK; 3226 } 3227 3228 JavaVMInitArgs* get() { return &_args; } 3229 char* container_name() { return _container_name; } 3230 bool is_set() { return _is_set; } 3231 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3232 char* vm_options_file_arg() { return _vm_options_file_arg; } 3233 3234 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3235 if (_vm_options_file_arg != NULL) { 3236 os::free(_vm_options_file_arg); 3237 } 3238 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3239 } 3240 3241 ~ScopedVMInitArgs() { 3242 if (_vm_options_file_arg != NULL) { 3243 os::free(_vm_options_file_arg); 3244 } 3245 if (_args.options == NULL) return; 3246 for (int i = 0; i < _args.nOptions; i++) { 3247 os::free(_args.options[i].optionString); 3248 } 3249 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3250 } 3251 3252 // Insert options into this option list, to replace option at 3253 // vm_options_file_pos (-XX:VMOptionsFile) 3254 jint insert(const JavaVMInitArgs* args, 3255 const JavaVMInitArgs* args_to_insert, 3256 const int vm_options_file_pos) { 3257 assert(_args.options == NULL, "shouldn't be set yet"); 3258 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3259 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3260 3261 int length = args->nOptions + args_to_insert->nOptions - 1; 3262 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3263 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3264 for (int i = 0; i < args->nOptions; i++) { 3265 if (i == vm_options_file_pos) { 3266 // insert the new options starting at the same place as the 3267 // -XX:VMOptionsFile option 3268 for (int j = 0; j < args_to_insert->nOptions; j++) { 3269 options->push(args_to_insert->options[j]); 3270 } 3271 } else { 3272 options->push(args->options[i]); 3273 } 3274 } 3275 // make into options array 3276 jint result = set_args(options); 3277 delete options; 3278 return result; 3279 } 3280 }; 3281 3282 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3283 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3284 } 3285 3286 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3287 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3288 } 3289 3290 jint Arguments::parse_options_environment_variable(const char* name, 3291 ScopedVMInitArgs* vm_args) { 3292 char *buffer = ::getenv(name); 3293 3294 // Don't check this environment variable if user has special privileges 3295 // (e.g. unix su command). 3296 if (buffer == NULL || os::have_special_privileges()) { 3297 return JNI_OK; 3298 } 3299 3300 if ((buffer = os::strdup(buffer)) == NULL) { 3301 return JNI_ENOMEM; 3302 } 3303 3304 jio_fprintf(defaultStream::error_stream(), 3305 "Picked up %s: %s\n", name, buffer); 3306 3307 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3308 3309 os::free(buffer); 3310 return retcode; 3311 } 3312 3313 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3314 // read file into buffer 3315 int fd = ::open(file_name, O_RDONLY); 3316 if (fd < 0) { 3317 jio_fprintf(defaultStream::error_stream(), 3318 "Could not open options file '%s'\n", 3319 file_name); 3320 return JNI_ERR; 3321 } 3322 3323 struct stat stbuf; 3324 int retcode = os::stat(file_name, &stbuf); 3325 if (retcode != 0) { 3326 jio_fprintf(defaultStream::error_stream(), 3327 "Could not stat options file '%s'\n", 3328 file_name); 3329 os::close(fd); 3330 return JNI_ERR; 3331 } 3332 3333 if (stbuf.st_size == 0) { 3334 // tell caller there is no option data and that is ok 3335 os::close(fd); 3336 return JNI_OK; 3337 } 3338 3339 // '+ 1' for NULL termination even with max bytes 3340 size_t bytes_alloc = stbuf.st_size + 1; 3341 3342 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3343 if (NULL == buf) { 3344 jio_fprintf(defaultStream::error_stream(), 3345 "Could not allocate read buffer for options file parse\n"); 3346 os::close(fd); 3347 return JNI_ENOMEM; 3348 } 3349 3350 memset(buf, 0, bytes_alloc); 3351 3352 // Fill buffer 3353 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc); 3354 os::close(fd); 3355 if (bytes_read < 0) { 3356 FREE_C_HEAP_ARRAY(char, buf); 3357 jio_fprintf(defaultStream::error_stream(), 3358 "Could not read options file '%s'\n", file_name); 3359 return JNI_ERR; 3360 } 3361 3362 if (bytes_read == 0) { 3363 // tell caller there is no option data and that is ok 3364 FREE_C_HEAP_ARRAY(char, buf); 3365 return JNI_OK; 3366 } 3367 3368 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3369 3370 FREE_C_HEAP_ARRAY(char, buf); 3371 return retcode; 3372 } 3373 3374 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3375 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3376 3377 // some pointers to help with parsing 3378 char *buffer_end = buffer + buf_len; 3379 char *opt_hd = buffer; 3380 char *wrt = buffer; 3381 char *rd = buffer; 3382 3383 // parse all options 3384 while (rd < buffer_end) { 3385 // skip leading white space from the input string 3386 while (rd < buffer_end && isspace(*rd)) { 3387 rd++; 3388 } 3389 3390 if (rd >= buffer_end) { 3391 break; 3392 } 3393 3394 // Remember this is where we found the head of the token. 3395 opt_hd = wrt; 3396 3397 // Tokens are strings of non white space characters separated 3398 // by one or more white spaces. 3399 while (rd < buffer_end && !isspace(*rd)) { 3400 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3401 int quote = *rd; // matching quote to look for 3402 rd++; // don't copy open quote 3403 while (rd < buffer_end && *rd != quote) { 3404 // include everything (even spaces) 3405 // up until the close quote 3406 *wrt++ = *rd++; // copy to option string 3407 } 3408 3409 if (rd < buffer_end) { 3410 rd++; // don't copy close quote 3411 } else { 3412 // did not see closing quote 3413 jio_fprintf(defaultStream::error_stream(), 3414 "Unmatched quote in %s\n", name); 3415 delete options; 3416 return JNI_ERR; 3417 } 3418 } else { 3419 *wrt++ = *rd++; // copy to option string 3420 } 3421 } 3422 3423 // steal a white space character and set it to NULL 3424 *wrt++ = '\0'; 3425 // We now have a complete token 3426 3427 JavaVMOption option; 3428 option.optionString = opt_hd; 3429 option.extraInfo = NULL; 3430 3431 options->append(option); // Fill in option 3432 3433 rd++; // Advance to next character 3434 } 3435 3436 // Fill out JavaVMInitArgs structure. 3437 jint status = vm_args->set_args(options); 3438 3439 delete options; 3440 return status; 3441 } 3442 3443 void Arguments::set_shared_spaces_flags() { 3444 if (DumpSharedSpaces) { 3445 if (RequireSharedSpaces) { 3446 warning("Cannot dump shared archive while using shared archive"); 3447 } 3448 UseSharedSpaces = false; 3449 #ifdef _LP64 3450 if (!UseCompressedOops || !UseCompressedClassPointers) { 3451 vm_exit_during_initialization( 3452 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3453 } 3454 } else { 3455 if (!UseCompressedOops || !UseCompressedClassPointers) { 3456 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3457 } 3458 #endif 3459 } 3460 } 3461 3462 #if INCLUDE_CDS 3463 // Sharing support 3464 // Construct the path to the archive 3465 char* Arguments::get_default_shared_archive_path() { 3466 char *default_archive_path; 3467 char jvm_path[JVM_MAXPATHLEN]; 3468 os::jvm_path(jvm_path, sizeof(jvm_path)); 3469 char *end = strrchr(jvm_path, *os::file_separator()); 3470 if (end != NULL) *end = '\0'; 3471 size_t jvm_path_len = strlen(jvm_path); 3472 size_t file_sep_len = strlen(os::file_separator()); 3473 const size_t len = jvm_path_len + file_sep_len + 20; 3474 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3475 if (default_archive_path != NULL) { 3476 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa", 3477 jvm_path, os::file_separator()); 3478 } 3479 return default_archive_path; 3480 } 3481 3482 int Arguments::num_archives(const char* archive_path) { 3483 if (archive_path == NULL) { 3484 return 0; 3485 } 3486 int npaths = 1; 3487 char* p = (char*)archive_path; 3488 while (*p != '\0') { 3489 if (*p == os::path_separator()[0]) { 3490 npaths++; 3491 } 3492 p++; 3493 } 3494 return npaths; 3495 } 3496 3497 void Arguments::extract_shared_archive_paths(const char* archive_path, 3498 char** base_archive_path, 3499 char** top_archive_path) { 3500 char* begin_ptr = (char*)archive_path; 3501 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3502 if (end_ptr == NULL || end_ptr == begin_ptr) { 3503 vm_exit_during_initialization("Base archive was not specified", archive_path); 3504 } 3505 size_t len = end_ptr - begin_ptr; 3506 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3507 strncpy(cur_path, begin_ptr, len); 3508 cur_path[len] = '\0'; 3509 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/); 3510 *base_archive_path = cur_path; 3511 3512 begin_ptr = ++end_ptr; 3513 if (*begin_ptr == '\0') { 3514 vm_exit_during_initialization("Top archive was not specified", archive_path); 3515 } 3516 end_ptr = strchr(begin_ptr, '\0'); 3517 assert(end_ptr != NULL, "sanity"); 3518 len = end_ptr - begin_ptr; 3519 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3520 strncpy(cur_path, begin_ptr, len + 1); 3521 //cur_path[len] = '\0'; 3522 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/); 3523 *top_archive_path = cur_path; 3524 } 3525 3526 bool Arguments::init_shared_archive_paths() { 3527 if (ArchiveClassesAtExit != NULL) { 3528 if (DumpSharedSpaces) { 3529 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3530 } 3531 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) { 3532 return false; 3533 } 3534 check_unsupported_dumping_properties(); 3535 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments); 3536 } 3537 if (SharedArchiveFile == NULL) { 3538 SharedArchivePath = get_default_shared_archive_path(); 3539 } else { 3540 int archives = num_archives(SharedArchiveFile); 3541 if (DynamicDumpSharedSpaces || DumpSharedSpaces) { 3542 if (archives > 1) { 3543 vm_exit_during_initialization( 3544 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3545 } 3546 if (DynamicDumpSharedSpaces) { 3547 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3548 vm_exit_during_initialization( 3549 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3550 SharedArchiveFile); 3551 } 3552 } 3553 } 3554 if (!DynamicDumpSharedSpaces && !DumpSharedSpaces){ 3555 if (archives > 2) { 3556 vm_exit_during_initialization( 3557 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3558 } 3559 if (archives == 1) { 3560 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3561 int name_size; 3562 bool success = 3563 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath); 3564 if (!success) { 3565 SharedArchivePath = temp_archive_path; 3566 } else { 3567 SharedDynamicArchivePath = temp_archive_path; 3568 } 3569 } else { 3570 extract_shared_archive_paths((const char*)SharedArchiveFile, 3571 &SharedArchivePath, &SharedDynamicArchivePath); 3572 } 3573 } else { // CDS dumping 3574 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3575 } 3576 } 3577 return (SharedArchivePath != NULL); 3578 } 3579 #endif // INCLUDE_CDS 3580 3581 #ifndef PRODUCT 3582 // Determine whether LogVMOutput should be implicitly turned on. 3583 static bool use_vm_log() { 3584 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3585 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3586 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3587 PrintAssembly || TraceDeoptimization || TraceDependencies || 3588 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3589 return true; 3590 } 3591 3592 #ifdef COMPILER1 3593 if (PrintC1Statistics) { 3594 return true; 3595 } 3596 #endif // COMPILER1 3597 3598 #ifdef COMPILER2 3599 if (PrintOptoAssembly || PrintOptoStatistics) { 3600 return true; 3601 } 3602 #endif // COMPILER2 3603 3604 return false; 3605 } 3606 3607 #endif // PRODUCT 3608 3609 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3610 for (int index = 0; index < args->nOptions; index++) { 3611 const JavaVMOption* option = args->options + index; 3612 const char* tail; 3613 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3614 return true; 3615 } 3616 } 3617 return false; 3618 } 3619 3620 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3621 const char* vm_options_file, 3622 const int vm_options_file_pos, 3623 ScopedVMInitArgs* vm_options_file_args, 3624 ScopedVMInitArgs* args_out) { 3625 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3626 if (code != JNI_OK) { 3627 return code; 3628 } 3629 3630 if (vm_options_file_args->get()->nOptions < 1) { 3631 return JNI_OK; 3632 } 3633 3634 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3635 jio_fprintf(defaultStream::error_stream(), 3636 "A VM options file may not refer to a VM options file. " 3637 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3638 "options file '%s' in options container '%s' is an error.\n", 3639 vm_options_file_args->vm_options_file_arg(), 3640 vm_options_file_args->container_name()); 3641 return JNI_EINVAL; 3642 } 3643 3644 return args_out->insert(args, vm_options_file_args->get(), 3645 vm_options_file_pos); 3646 } 3647 3648 // Expand -XX:VMOptionsFile found in args_in as needed. 3649 // mod_args and args_out parameters may return values as needed. 3650 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3651 ScopedVMInitArgs* mod_args, 3652 JavaVMInitArgs** args_out) { 3653 jint code = match_special_option_and_act(args_in, mod_args); 3654 if (code != JNI_OK) { 3655 return code; 3656 } 3657 3658 if (mod_args->is_set()) { 3659 // args_in contains -XX:VMOptionsFile and mod_args contains the 3660 // original options from args_in along with the options expanded 3661 // from the VMOptionsFile. Return a short-hand to the caller. 3662 *args_out = mod_args->get(); 3663 } else { 3664 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3665 } 3666 return JNI_OK; 3667 } 3668 3669 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3670 ScopedVMInitArgs* args_out) { 3671 // Remaining part of option string 3672 const char* tail; 3673 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3674 3675 for (int index = 0; index < args->nOptions; index++) { 3676 const JavaVMOption* option = args->options + index; 3677 if (match_option(option, "-XX:Flags=", &tail)) { 3678 Arguments::set_jvm_flags_file(tail); 3679 continue; 3680 } 3681 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3682 if (vm_options_file_args.found_vm_options_file_arg()) { 3683 jio_fprintf(defaultStream::error_stream(), 3684 "The option '%s' is already specified in the options " 3685 "container '%s' so the specification of '%s' in the " 3686 "same options container is an error.\n", 3687 vm_options_file_args.vm_options_file_arg(), 3688 vm_options_file_args.container_name(), 3689 option->optionString); 3690 return JNI_EINVAL; 3691 } 3692 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3693 // If there's a VMOptionsFile, parse that 3694 jint code = insert_vm_options_file(args, tail, index, 3695 &vm_options_file_args, args_out); 3696 if (code != JNI_OK) { 3697 return code; 3698 } 3699 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3700 if (args_out->is_set()) { 3701 // The VMOptions file inserted some options so switch 'args' 3702 // to the new set of options, and continue processing which 3703 // preserves "last option wins" semantics. 3704 args = args_out->get(); 3705 // The first option from the VMOptionsFile replaces the 3706 // current option. So we back track to process the 3707 // replacement option. 3708 index--; 3709 } 3710 continue; 3711 } 3712 if (match_option(option, "-XX:+PrintVMOptions")) { 3713 PrintVMOptions = true; 3714 continue; 3715 } 3716 if (match_option(option, "-XX:-PrintVMOptions")) { 3717 PrintVMOptions = false; 3718 continue; 3719 } 3720 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3721 IgnoreUnrecognizedVMOptions = true; 3722 continue; 3723 } 3724 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3725 IgnoreUnrecognizedVMOptions = false; 3726 continue; 3727 } 3728 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3729 JVMFlag::printFlags(tty, false); 3730 vm_exit(0); 3731 } 3732 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3733 #if INCLUDE_NMT 3734 // The launcher did not setup nmt environment variable properly. 3735 if (!MemTracker::check_launcher_nmt_support(tail)) { 3736 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3737 } 3738 3739 // Verify if nmt option is valid. 3740 if (MemTracker::verify_nmt_option()) { 3741 // Late initialization, still in single-threaded mode. 3742 if (MemTracker::tracking_level() >= NMT_summary) { 3743 MemTracker::init(); 3744 } 3745 } else { 3746 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3747 } 3748 continue; 3749 #else 3750 jio_fprintf(defaultStream::error_stream(), 3751 "Native Memory Tracking is not supported in this VM\n"); 3752 return JNI_ERR; 3753 #endif 3754 } 3755 3756 #ifndef PRODUCT 3757 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3758 JVMFlag::printFlags(tty, true); 3759 vm_exit(0); 3760 } 3761 #endif 3762 } 3763 return JNI_OK; 3764 } 3765 3766 static void print_options(const JavaVMInitArgs *args) { 3767 const char* tail; 3768 for (int index = 0; index < args->nOptions; index++) { 3769 const JavaVMOption *option = args->options + index; 3770 if (match_option(option, "-XX:", &tail)) { 3771 logOption(tail); 3772 } 3773 } 3774 } 3775 3776 bool Arguments::handle_deprecated_print_gc_flags() { 3777 if (PrintGC) { 3778 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3779 } 3780 if (PrintGCDetails) { 3781 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3782 } 3783 3784 if (_gc_log_filename != NULL) { 3785 // -Xloggc was used to specify a filename 3786 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3787 3788 LogTarget(Error, logging) target; 3789 LogStream errstream(target); 3790 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 3791 } else if (PrintGC || PrintGCDetails) { 3792 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3793 } 3794 return true; 3795 } 3796 3797 void Arguments::handle_extra_cms_flags(const char* msg) { 3798 SpecialFlag flag; 3799 const char *flag_name = "UseConcMarkSweepGC"; 3800 if (lookup_special_flag(flag_name, flag)) { 3801 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 3802 warning("%s", msg); 3803 } 3804 } 3805 3806 // Parse entry point called from JNI_CreateJavaVM 3807 3808 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3809 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 3810 3811 // Initialize ranges, constraints and writeables 3812 JVMFlagRangeList::init(); 3813 JVMFlagConstraintList::init(); 3814 JVMFlagWriteableList::init(); 3815 3816 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3817 const char* hotspotrc = ".hotspotrc"; 3818 bool settings_file_specified = false; 3819 bool needs_hotspotrc_warning = false; 3820 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3821 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3822 3823 // Pointers to current working set of containers 3824 JavaVMInitArgs* cur_cmd_args; 3825 JavaVMInitArgs* cur_java_options_args; 3826 JavaVMInitArgs* cur_java_tool_options_args; 3827 3828 // Containers for modified/expanded options 3829 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3830 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3831 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3832 3833 3834 jint code = 3835 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3836 if (code != JNI_OK) { 3837 return code; 3838 } 3839 3840 code = parse_java_options_environment_variable(&initial_java_options_args); 3841 if (code != JNI_OK) { 3842 return code; 3843 } 3844 3845 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3846 &mod_java_tool_options_args, 3847 &cur_java_tool_options_args); 3848 if (code != JNI_OK) { 3849 return code; 3850 } 3851 3852 code = expand_vm_options_as_needed(initial_cmd_args, 3853 &mod_cmd_args, 3854 &cur_cmd_args); 3855 if (code != JNI_OK) { 3856 return code; 3857 } 3858 3859 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3860 &mod_java_options_args, 3861 &cur_java_options_args); 3862 if (code != JNI_OK) { 3863 return code; 3864 } 3865 3866 const char* flags_file = Arguments::get_jvm_flags_file(); 3867 settings_file_specified = (flags_file != NULL); 3868 3869 if (IgnoreUnrecognizedVMOptions) { 3870 cur_cmd_args->ignoreUnrecognized = true; 3871 cur_java_tool_options_args->ignoreUnrecognized = true; 3872 cur_java_options_args->ignoreUnrecognized = true; 3873 } 3874 3875 // Parse specified settings file 3876 if (settings_file_specified) { 3877 if (!process_settings_file(flags_file, true, 3878 cur_cmd_args->ignoreUnrecognized)) { 3879 return JNI_EINVAL; 3880 } 3881 } else { 3882 #ifdef ASSERT 3883 // Parse default .hotspotrc settings file 3884 if (!process_settings_file(".hotspotrc", false, 3885 cur_cmd_args->ignoreUnrecognized)) { 3886 return JNI_EINVAL; 3887 } 3888 #else 3889 struct stat buf; 3890 if (os::stat(hotspotrc, &buf) == 0) { 3891 needs_hotspotrc_warning = true; 3892 } 3893 #endif 3894 } 3895 3896 if (PrintVMOptions) { 3897 print_options(cur_java_tool_options_args); 3898 print_options(cur_cmd_args); 3899 print_options(cur_java_options_args); 3900 } 3901 3902 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3903 jint result = parse_vm_init_args(cur_java_tool_options_args, 3904 cur_java_options_args, 3905 cur_cmd_args); 3906 3907 if (result != JNI_OK) { 3908 return result; 3909 } 3910 3911 #if INCLUDE_CDS 3912 // Initialize shared archive paths which could include both base and dynamic archive paths 3913 if (!init_shared_archive_paths()) { 3914 return JNI_ENOMEM; 3915 } 3916 #endif 3917 3918 // Delay warning until here so that we've had a chance to process 3919 // the -XX:-PrintWarnings flag 3920 if (needs_hotspotrc_warning) { 3921 warning("%s file is present but has been ignored. " 3922 "Run with -XX:Flags=%s to load the file.", 3923 hotspotrc, hotspotrc); 3924 } 3925 3926 if (needs_module_property_warning) { 3927 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3928 " names that are reserved for internal use."); 3929 } 3930 3931 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3932 UNSUPPORTED_OPTION(UseLargePages); 3933 #endif 3934 3935 #if defined(AIX) 3936 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3937 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt); 3938 #endif 3939 3940 #ifndef PRODUCT 3941 if (TraceBytecodesAt != 0) { 3942 TraceBytecodes = true; 3943 } 3944 if (CountCompiledCalls) { 3945 if (UseCounterDecay) { 3946 warning("UseCounterDecay disabled because CountCalls is set"); 3947 UseCounterDecay = false; 3948 } 3949 } 3950 #endif // PRODUCT 3951 3952 if (ScavengeRootsInCode == 0) { 3953 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3954 warning("Forcing ScavengeRootsInCode non-zero"); 3955 } 3956 ScavengeRootsInCode = 1; 3957 } 3958 3959 if (!handle_deprecated_print_gc_flags()) { 3960 return JNI_EINVAL; 3961 } 3962 3963 // Set object alignment values. 3964 set_object_alignment(); 3965 3966 #if !INCLUDE_CDS 3967 if (DumpSharedSpaces || RequireSharedSpaces) { 3968 jio_fprintf(defaultStream::error_stream(), 3969 "Shared spaces are not supported in this VM\n"); 3970 return JNI_ERR; 3971 } 3972 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 3973 log_is_enabled(Info, cds)) { 3974 warning("Shared spaces are not supported in this VM"); 3975 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3976 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3977 } 3978 no_shared_spaces("CDS Disabled"); 3979 #endif // INCLUDE_CDS 3980 3981 return JNI_OK; 3982 } 3983 3984 jint Arguments::apply_ergo() { 3985 // Set flags based on ergonomics. 3986 jint result = set_ergonomics_flags(); 3987 if (result != JNI_OK) return result; 3988 3989 // Set heap size based on available physical memory 3990 set_heap_size(); 3991 3992 GCConfig::arguments()->initialize(); 3993 3994 set_shared_spaces_flags(); 3995 3996 // Initialize Metaspace flags and alignments 3997 Metaspace::ergo_initialize(); 3998 3999 // Set compiler flags after GC is selected and GC specific 4000 // flags (LoopStripMiningIter) are set. 4001 CompilerConfig::ergo_initialize(); 4002 4003 // Set bytecode rewriting flags 4004 set_bytecode_flags(); 4005 4006 // Set flags if aggressive optimization flags are enabled 4007 jint code = set_aggressive_opts_flags(); 4008 if (code != JNI_OK) { 4009 return code; 4010 } 4011 4012 // Turn off biased locking for locking debug mode flags, 4013 // which are subtly different from each other but neither works with 4014 // biased locking 4015 if (UseHeavyMonitors 4016 #ifdef COMPILER1 4017 || !UseFastLocking 4018 #endif // COMPILER1 4019 #if INCLUDE_JVMCI 4020 || !JVMCIUseFastLocking 4021 #endif 4022 ) { 4023 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4024 // flag set to true on command line; warn the user that they 4025 // can't enable biased locking here 4026 warning("Biased Locking is not supported with locking debug flags" 4027 "; ignoring UseBiasedLocking flag." ); 4028 } 4029 UseBiasedLocking = false; 4030 } 4031 4032 #ifdef CC_INTERP 4033 // Clear flags not supported on zero. 4034 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4035 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4036 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4037 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4038 #endif // CC_INTERP 4039 4040 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4041 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4042 DebugNonSafepoints = true; 4043 } 4044 4045 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4046 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4047 } 4048 4049 // Treat the odd case where local verification is enabled but remote 4050 // verification is not as if both were enabled. 4051 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4052 log_info(verification)("Turning on remote verification because local verification is on"); 4053 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4054 } 4055 4056 #ifndef PRODUCT 4057 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4058 if (use_vm_log()) { 4059 LogVMOutput = true; 4060 } 4061 } 4062 #endif // PRODUCT 4063 4064 if (PrintCommandLineFlags) { 4065 JVMFlag::printSetFlags(tty); 4066 } 4067 4068 // Apply CPU specific policy for the BiasedLocking 4069 if (UseBiasedLocking) { 4070 if (!VM_Version::use_biased_locking() && 4071 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4072 UseBiasedLocking = false; 4073 } 4074 } 4075 #ifdef COMPILER2 4076 if (!UseBiasedLocking) { 4077 UseOptoBiasInlining = false; 4078 } 4079 #endif 4080 4081 #if defined(IA32) 4082 // Only server compiler can optimize safepoints well enough. 4083 if (!is_server_compilation_mode_vm()) { 4084 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false); 4085 } 4086 #endif 4087 4088 // ThreadLocalHandshakesConstraintFunc handles the constraints. 4089 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 4090 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4091 } else { 4092 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4093 } 4094 4095 return JNI_OK; 4096 } 4097 4098 jint Arguments::adjust_after_os() { 4099 if (UseNUMA) { 4100 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 4101 FLAG_SET_ERGO(UseNUMA, false); 4102 } else if (UseParallelGC || UseParallelOldGC) { 4103 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4104 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4105 } 4106 } 4107 // UseNUMAInterleaving is set to ON for all collectors and 4108 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4109 // such as the parallel collector for Linux and Solaris will 4110 // interleave old gen and survivor spaces on top of NUMA 4111 // allocation policy for the eden space. 4112 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4113 // all platforms and ParallelGC on Windows will interleave all 4114 // of the heap spaces across NUMA nodes. 4115 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4116 FLAG_SET_ERGO(UseNUMAInterleaving, true); 4117 } 4118 } 4119 return JNI_OK; 4120 } 4121 4122 int Arguments::PropertyList_count(SystemProperty* pl) { 4123 int count = 0; 4124 while(pl != NULL) { 4125 count++; 4126 pl = pl->next(); 4127 } 4128 return count; 4129 } 4130 4131 // Return the number of readable properties. 4132 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4133 int count = 0; 4134 while(pl != NULL) { 4135 if (pl->is_readable()) { 4136 count++; 4137 } 4138 pl = pl->next(); 4139 } 4140 return count; 4141 } 4142 4143 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4144 assert(key != NULL, "just checking"); 4145 SystemProperty* prop; 4146 for (prop = pl; prop != NULL; prop = prop->next()) { 4147 if (strcmp(key, prop->key()) == 0) return prop->value(); 4148 } 4149 return NULL; 4150 } 4151 4152 // Return the value of the requested property provided that it is a readable property. 4153 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4154 assert(key != NULL, "just checking"); 4155 SystemProperty* prop; 4156 // Return the property value if the keys match and the property is not internal or 4157 // it's the special internal property "jdk.boot.class.path.append". 4158 for (prop = pl; prop != NULL; prop = prop->next()) { 4159 if (strcmp(key, prop->key()) == 0) { 4160 if (!prop->internal()) { 4161 return prop->value(); 4162 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4163 return prop->value(); 4164 } else { 4165 // Property is internal and not jdk.boot.class.path.append so return NULL. 4166 return NULL; 4167 } 4168 } 4169 } 4170 return NULL; 4171 } 4172 4173 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4174 int count = 0; 4175 const char* ret_val = NULL; 4176 4177 while(pl != NULL) { 4178 if(count >= index) { 4179 ret_val = pl->key(); 4180 break; 4181 } 4182 count++; 4183 pl = pl->next(); 4184 } 4185 4186 return ret_val; 4187 } 4188 4189 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4190 int count = 0; 4191 char* ret_val = NULL; 4192 4193 while(pl != NULL) { 4194 if(count >= index) { 4195 ret_val = pl->value(); 4196 break; 4197 } 4198 count++; 4199 pl = pl->next(); 4200 } 4201 4202 return ret_val; 4203 } 4204 4205 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4206 SystemProperty* p = *plist; 4207 if (p == NULL) { 4208 *plist = new_p; 4209 } else { 4210 while (p->next() != NULL) { 4211 p = p->next(); 4212 } 4213 p->set_next(new_p); 4214 } 4215 } 4216 4217 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4218 bool writeable, bool internal) { 4219 if (plist == NULL) 4220 return; 4221 4222 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4223 PropertyList_add(plist, new_p); 4224 } 4225 4226 void Arguments::PropertyList_add(SystemProperty *element) { 4227 PropertyList_add(&_system_properties, element); 4228 } 4229 4230 // This add maintains unique property key in the list. 4231 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4232 PropertyAppendable append, PropertyWriteable writeable, 4233 PropertyInternal internal) { 4234 if (plist == NULL) 4235 return; 4236 4237 // If property key exist then update with new value. 4238 SystemProperty* prop; 4239 for (prop = *plist; prop != NULL; prop = prop->next()) { 4240 if (strcmp(k, prop->key()) == 0) { 4241 if (append == AppendProperty) { 4242 prop->append_value(v); 4243 } else { 4244 prop->set_value(v); 4245 } 4246 return; 4247 } 4248 } 4249 4250 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4251 } 4252 4253 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4254 // Returns true if all of the source pointed by src has been copied over to 4255 // the destination buffer pointed by buf. Otherwise, returns false. 4256 // Notes: 4257 // 1. If the length (buflen) of the destination buffer excluding the 4258 // NULL terminator character is not long enough for holding the expanded 4259 // pid characters, it also returns false instead of returning the partially 4260 // expanded one. 4261 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4262 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4263 char* buf, size_t buflen) { 4264 const char* p = src; 4265 char* b = buf; 4266 const char* src_end = &src[srclen]; 4267 char* buf_end = &buf[buflen - 1]; 4268 4269 while (p < src_end && b < buf_end) { 4270 if (*p == '%') { 4271 switch (*(++p)) { 4272 case '%': // "%%" ==> "%" 4273 *b++ = *p++; 4274 break; 4275 case 'p': { // "%p" ==> current process id 4276 // buf_end points to the character before the last character so 4277 // that we could write '\0' to the end of the buffer. 4278 size_t buf_sz = buf_end - b + 1; 4279 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4280 4281 // if jio_snprintf fails or the buffer is not long enough to hold 4282 // the expanded pid, returns false. 4283 if (ret < 0 || ret >= (int)buf_sz) { 4284 return false; 4285 } else { 4286 b += ret; 4287 assert(*b == '\0', "fail in copy_expand_pid"); 4288 if (p == src_end && b == buf_end + 1) { 4289 // reach the end of the buffer. 4290 return true; 4291 } 4292 } 4293 p++; 4294 break; 4295 } 4296 default : 4297 *b++ = '%'; 4298 } 4299 } else { 4300 *b++ = *p++; 4301 } 4302 } 4303 *b = '\0'; 4304 return (p == src_end); // return false if not all of the source was copied 4305 }