1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/javaAssertions.hpp" 29 #include "classfile/moduleEntry.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "gc/shared/gcArguments.hpp" 33 #include "gc/shared/gcConfig.hpp" 34 #include "logging/log.hpp" 35 #include "logging/logConfiguration.hpp" 36 #include "logging/logStream.hpp" 37 #include "logging/logTag.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/filemap.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "prims/jvmtiExport.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/flags/jvmFlag.hpp" 44 #include "runtime/flags/jvmFlagConstraintList.hpp" 45 #include "runtime/flags/jvmFlagWriteableList.hpp" 46 #include "runtime/flags/jvmFlagRangeList.hpp" 47 #include "runtime/globals_extension.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/os.inline.hpp" 50 #include "runtime/safepoint.hpp" 51 #include "runtime/safepointMechanism.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/align.hpp" 56 #include "utilities/defaultStream.hpp" 57 #include "utilities/macros.hpp" 58 #include "utilities/stringUtils.hpp" 59 #if INCLUDE_JFR 60 #include "jfr/jfr.hpp" 61 #endif 62 63 // Note: This is a special bug reporting site for the JVM 64 #ifdef VENDOR_URL_VM_BUG 65 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG 66 #else 67 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 68 #endif 69 #define DEFAULT_JAVA_LAUNCHER "generic" 70 71 char* Arguments::_jvm_flags_file = NULL; 72 char** Arguments::_jvm_flags_array = NULL; 73 int Arguments::_num_jvm_flags = 0; 74 char** Arguments::_jvm_args_array = NULL; 75 int Arguments::_num_jvm_args = 0; 76 char* Arguments::_java_command = NULL; 77 SystemProperty* Arguments::_system_properties = NULL; 78 const char* Arguments::_gc_log_filename = NULL; 79 size_t Arguments::_conservative_max_heap_alignment = 0; 80 Arguments::Mode Arguments::_mode = _mixed; 81 bool Arguments::_java_compiler = false; 82 bool Arguments::_xdebug_mode = false; 83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 85 int Arguments::_sun_java_launcher_pid = -1; 86 bool Arguments::_sun_java_launcher_is_altjvm = false; 87 88 // These parameters are reset in method parse_vm_init_args() 89 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 90 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 91 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 92 bool Arguments::_ClipInlining = ClipInlining; 93 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 94 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 95 96 bool Arguments::_enable_preview = false; 97 98 char* Arguments::SharedArchivePath = NULL; 99 char* Arguments::SharedDynamicArchivePath = NULL; 100 101 AgentLibraryList Arguments::_libraryList; 102 AgentLibraryList Arguments::_agentList; 103 104 // These are not set by the JDK's built-in launchers, but they can be set by 105 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 106 // JavaVMOption in jni.h. 107 abort_hook_t Arguments::_abort_hook = NULL; 108 exit_hook_t Arguments::_exit_hook = NULL; 109 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 110 111 112 SystemProperty *Arguments::_sun_boot_library_path = NULL; 113 SystemProperty *Arguments::_java_library_path = NULL; 114 SystemProperty *Arguments::_java_home = NULL; 115 SystemProperty *Arguments::_java_class_path = NULL; 116 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 117 SystemProperty *Arguments::_vm_info = NULL; 118 119 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 120 PathString *Arguments::_system_boot_class_path = NULL; 121 bool Arguments::_has_jimage = false; 122 123 char* Arguments::_ext_dirs = NULL; 124 125 bool PathString::set_value(const char *value) { 126 if (_value != NULL) { 127 FreeHeap(_value); 128 } 129 _value = AllocateHeap(strlen(value)+1, mtArguments); 130 assert(_value != NULL, "Unable to allocate space for new path value"); 131 if (_value != NULL) { 132 strcpy(_value, value); 133 } else { 134 // not able to allocate 135 return false; 136 } 137 return true; 138 } 139 140 void PathString::append_value(const char *value) { 141 char *sp; 142 size_t len = 0; 143 if (value != NULL) { 144 len = strlen(value); 145 if (_value != NULL) { 146 len += strlen(_value); 147 } 148 sp = AllocateHeap(len+2, mtArguments); 149 assert(sp != NULL, "Unable to allocate space for new append path value"); 150 if (sp != NULL) { 151 if (_value != NULL) { 152 strcpy(sp, _value); 153 strcat(sp, os::path_separator()); 154 strcat(sp, value); 155 FreeHeap(_value); 156 } else { 157 strcpy(sp, value); 158 } 159 _value = sp; 160 } 161 } 162 } 163 164 PathString::PathString(const char* value) { 165 if (value == NULL) { 166 _value = NULL; 167 } else { 168 _value = AllocateHeap(strlen(value)+1, mtArguments); 169 strcpy(_value, value); 170 } 171 } 172 173 PathString::~PathString() { 174 if (_value != NULL) { 175 FreeHeap(_value); 176 _value = NULL; 177 } 178 } 179 180 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 181 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 182 size_t len = strlen(module_name) + 1; 183 _module_name = AllocateHeap(len, mtInternal); 184 strncpy(_module_name, module_name, len); // copy the trailing null 185 _path = new PathString(path); 186 } 187 188 ModulePatchPath::~ModulePatchPath() { 189 if (_module_name != NULL) { 190 FreeHeap(_module_name); 191 _module_name = NULL; 192 } 193 if (_path != NULL) { 194 delete _path; 195 _path = NULL; 196 } 197 } 198 199 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 200 if (key == NULL) { 201 _key = NULL; 202 } else { 203 _key = AllocateHeap(strlen(key)+1, mtArguments); 204 strcpy(_key, key); 205 } 206 _next = NULL; 207 _internal = internal; 208 _writeable = writeable; 209 } 210 211 AgentLibrary::AgentLibrary(const char* name, const char* options, 212 bool is_absolute_path, void* os_lib, 213 bool instrument_lib) { 214 _name = AllocateHeap(strlen(name)+1, mtArguments); 215 strcpy(_name, name); 216 if (options == NULL) { 217 _options = NULL; 218 } else { 219 _options = AllocateHeap(strlen(options)+1, mtArguments); 220 strcpy(_options, options); 221 } 222 _is_absolute_path = is_absolute_path; 223 _os_lib = os_lib; 224 _next = NULL; 225 _state = agent_invalid; 226 _is_static_lib = false; 227 _is_instrument_lib = instrument_lib; 228 } 229 230 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 231 // part of the option string. 232 static bool match_option(const JavaVMOption *option, const char* name, 233 const char** tail) { 234 size_t len = strlen(name); 235 if (strncmp(option->optionString, name, len) == 0) { 236 *tail = option->optionString + len; 237 return true; 238 } else { 239 return false; 240 } 241 } 242 243 // Check if 'option' matches 'name'. No "tail" is allowed. 244 static bool match_option(const JavaVMOption *option, const char* name) { 245 const char* tail = NULL; 246 bool result = match_option(option, name, &tail); 247 if (tail != NULL && *tail == '\0') { 248 return result; 249 } else { 250 return false; 251 } 252 } 253 254 // Return true if any of the strings in null-terminated array 'names' matches. 255 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 256 // the option must match exactly. 257 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 258 bool tail_allowed) { 259 for (/* empty */; *names != NULL; ++names) { 260 if (match_option(option, *names, tail)) { 261 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 262 return true; 263 } 264 } 265 } 266 return false; 267 } 268 269 #if INCLUDE_JFR 270 static bool _has_jfr_option = false; // is using JFR 271 272 // return true on failure 273 static bool match_jfr_option(const JavaVMOption** option) { 274 assert((*option)->optionString != NULL, "invariant"); 275 char* tail = NULL; 276 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 277 _has_jfr_option = true; 278 return Jfr::on_start_flight_recording_option(option, tail); 279 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 280 _has_jfr_option = true; 281 return Jfr::on_flight_recorder_option(option, tail); 282 } 283 return false; 284 } 285 286 bool Arguments::has_jfr_option() { 287 return _has_jfr_option; 288 } 289 #endif 290 291 static void logOption(const char* opt) { 292 if (PrintVMOptions) { 293 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 294 } 295 } 296 297 bool needs_module_property_warning = false; 298 299 #define MODULE_PROPERTY_PREFIX "jdk.module." 300 #define MODULE_PROPERTY_PREFIX_LEN 11 301 #define ADDEXPORTS "addexports" 302 #define ADDEXPORTS_LEN 10 303 #define ADDREADS "addreads" 304 #define ADDREADS_LEN 8 305 #define ADDOPENS "addopens" 306 #define ADDOPENS_LEN 8 307 #define PATCH "patch" 308 #define PATCH_LEN 5 309 #define ADDMODS "addmods" 310 #define ADDMODS_LEN 7 311 #define LIMITMODS "limitmods" 312 #define LIMITMODS_LEN 9 313 #define PATH "path" 314 #define PATH_LEN 4 315 #define UPGRADE_PATH "upgrade.path" 316 #define UPGRADE_PATH_LEN 12 317 318 void Arguments::add_init_library(const char* name, char* options) { 319 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 320 } 321 322 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 323 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 324 } 325 326 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 327 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 328 } 329 330 // Late-binding agents not started via arguments 331 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 332 _agentList.add(agentLib); 333 } 334 335 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 336 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 337 return ((strncmp(option, property, len) == 0) && 338 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 339 } 340 341 // Return true if property starts with "jdk.module." and its ensuing chars match 342 // any of the reserved module properties. 343 // property should be passed without the leading "-D". 344 bool Arguments::is_internal_module_property(const char* property) { 345 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 346 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 347 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 348 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 349 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 350 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 351 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 352 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 353 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 354 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 355 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 356 return true; 357 } 358 } 359 return false; 360 } 361 362 // Process java launcher properties. 363 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 364 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 365 // sun.java.launcher.pid is defined. 366 // Must do this before setting up other system properties, 367 // as some of them may depend on launcher type. 368 for (int index = 0; index < args->nOptions; index++) { 369 const JavaVMOption* option = args->options + index; 370 const char* tail; 371 372 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 373 process_java_launcher_argument(tail, option->extraInfo); 374 continue; 375 } 376 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 377 if (strcmp(tail, "true") == 0) { 378 _sun_java_launcher_is_altjvm = true; 379 } 380 continue; 381 } 382 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 383 _sun_java_launcher_pid = atoi(tail); 384 continue; 385 } 386 } 387 } 388 389 // Initialize system properties key and value. 390 void Arguments::init_system_properties() { 391 392 // Set up _system_boot_class_path which is not a property but 393 // relies heavily on argument processing and the jdk.boot.class.path.append 394 // property. It is used to store the underlying system boot class path. 395 _system_boot_class_path = new PathString(NULL); 396 397 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 398 "Java Virtual Machine Specification", false)); 399 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 400 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 401 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 402 403 // Initialize the vm.info now, but it will need updating after argument parsing. 404 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 405 406 // Following are JVMTI agent writable properties. 407 // Properties values are set to NULL and they are 408 // os specific they are initialized in os::init_system_properties_values(). 409 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 410 _java_library_path = new SystemProperty("java.library.path", NULL, true); 411 _java_home = new SystemProperty("java.home", NULL, true); 412 _java_class_path = new SystemProperty("java.class.path", "", true); 413 // jdk.boot.class.path.append is a non-writeable, internal property. 414 // It can only be set by either: 415 // - -Xbootclasspath/a: 416 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 417 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 418 419 // Add to System Property list. 420 PropertyList_add(&_system_properties, _sun_boot_library_path); 421 PropertyList_add(&_system_properties, _java_library_path); 422 PropertyList_add(&_system_properties, _java_home); 423 PropertyList_add(&_system_properties, _java_class_path); 424 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 425 PropertyList_add(&_system_properties, _vm_info); 426 427 // Set OS specific system properties values 428 os::init_system_properties_values(); 429 } 430 431 // Update/Initialize System properties after JDK version number is known 432 void Arguments::init_version_specific_system_properties() { 433 enum { bufsz = 16 }; 434 char buffer[bufsz]; 435 const char* spec_vendor = "Oracle Corporation"; 436 uint32_t spec_version = JDK_Version::current().major_version(); 437 438 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 439 440 PropertyList_add(&_system_properties, 441 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 442 PropertyList_add(&_system_properties, 443 new SystemProperty("java.vm.specification.version", buffer, false)); 444 PropertyList_add(&_system_properties, 445 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 446 } 447 448 /* 449 * -XX argument processing: 450 * 451 * -XX arguments are defined in several places, such as: 452 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 453 * -XX arguments are parsed in parse_argument(). 454 * -XX argument bounds checking is done in check_vm_args_consistency(). 455 * 456 * Over time -XX arguments may change. There are mechanisms to handle common cases: 457 * 458 * ALIASED: An option that is simply another name for another option. This is often 459 * part of the process of deprecating a flag, but not all aliases need 460 * to be deprecated. 461 * 462 * Create an alias for an option by adding the old and new option names to the 463 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 464 * 465 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 466 * support may be removed in the future. Both regular and aliased options may be 467 * deprecated. 468 * 469 * Add a deprecation warning for an option (or alias) by adding an entry in the 470 * "special_jvm_flags" table and setting the "deprecated_in" field. 471 * Often an option "deprecated" in one major release will 472 * be made "obsolete" in the next. In this case the entry should also have its 473 * "obsolete_in" field set. 474 * 475 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 476 * on the command line. A warning is printed to let the user know that option might not 477 * be accepted in the future. 478 * 479 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 480 * table and setting the "obsolete_in" field. 481 * 482 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 483 * to the current JDK version. The system will flatly refuse to admit the existence of 484 * the flag. This allows a flag to die automatically over JDK releases. 485 * 486 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 487 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 488 * - Newly obsolete or expired deprecated options should have their global variable 489 * definitions removed (from globals.hpp, etc) and related implementations removed. 490 * 491 * Recommended approach for removing options: 492 * 493 * To remove options commonly used by customers (e.g. product -XX options), use 494 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 495 * 496 * To remove internal options (e.g. diagnostic, experimental, develop options), use 497 * a 2-step model adding major release numbers to the obsolete and expire columns. 498 * 499 * To change the name of an option, use the alias table as well as a 2-step 500 * model adding major release numbers to the deprecate and expire columns. 501 * Think twice about aliasing commonly used customer options. 502 * 503 * There are times when it is appropriate to leave a future release number as undefined. 504 * 505 * Tests: Aliases should be tested in VMAliasOptions.java. 506 * Deprecated options should be tested in VMDeprecatedOptions.java. 507 */ 508 509 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 510 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 511 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 512 // the command-line as usual, but will issue a warning. 513 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 514 // the command-line, while issuing a warning and ignoring the flag value. 515 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 516 // existence of the flag. 517 // 518 // MANUAL CLEANUP ON JDK VERSION UPDATES: 519 // This table ensures that the handling of options will update automatically when the JDK 520 // version is incremented, but the source code needs to be cleanup up manually: 521 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 522 // variable should be removed, as well as users of the variable. 523 // - As "deprecated" options age into "obsolete" options, move the entry into the 524 // "Obsolete Flags" section of the table. 525 // - All expired options should be removed from the table. 526 static SpecialFlag const special_jvm_flags[] = { 527 // -------------- Deprecated Flags -------------- 528 // --- Non-alias flags - sorted by obsolete_in then expired_in: 529 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 530 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 531 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 532 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 533 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 534 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() }, 535 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() }, 536 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 537 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 538 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 539 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 540 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 541 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 542 543 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 544 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 545 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 546 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 547 548 // -------------- Obsolete Flags - sorted by expired_in -------------- 549 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 550 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 551 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 552 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 553 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 554 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 555 { "FailOverToOldVerifier", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 556 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 557 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 558 559 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 560 // These entries will generate build errors. Their purpose is to test the macros. 561 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 562 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 563 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 564 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 565 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 566 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 567 #endif 568 569 { NULL, JDK_Version(0), JDK_Version(0) } 570 }; 571 572 // Flags that are aliases for other flags. 573 typedef struct { 574 const char* alias_name; 575 const char* real_name; 576 } AliasedFlag; 577 578 static AliasedFlag const aliased_jvm_flags[] = { 579 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 580 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 581 { NULL, NULL} 582 }; 583 584 // NOTE: A compatibility request will be necessary for each alias to be removed. 585 static AliasedLoggingFlag const aliased_logging_flags[] = { 586 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 587 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 588 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 589 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 590 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 591 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 592 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 593 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 594 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 595 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 596 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) }, 597 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 598 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 599 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 600 { "TraceNMethodInstalls", LogLevel::Info, true, LOG_TAGS(nmethod, install) }, 601 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 602 }; 603 604 #ifndef PRODUCT 605 // These options are removed in jdk9. Remove this code for jdk10. 606 static AliasedFlag const removed_develop_logging_flags[] = { 607 { "TraceClassInitialization", "-Xlog:class+init" }, 608 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 609 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 610 { "TraceItables", "-Xlog:itables=debug" }, 611 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 612 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 613 { "TraceStartupTime", "-Xlog:startuptime" }, 614 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 615 { "PrintVtables", "-Xlog:vtables=debug" }, 616 { "VerboseVerification", "-Xlog:verification" }, 617 { NULL, NULL } 618 }; 619 #endif //PRODUCT 620 621 // Return true if "v" is less than "other", where "other" may be "undefined". 622 static bool version_less_than(JDK_Version v, JDK_Version other) { 623 assert(!v.is_undefined(), "must be defined"); 624 if (!other.is_undefined() && v.compare(other) >= 0) { 625 return false; 626 } else { 627 return true; 628 } 629 } 630 631 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 632 633 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 634 // Allow extensions to have priority 635 if (lookup_special_flag_ext(flag_name, flag)) { 636 return true; 637 } 638 639 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 640 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 641 flag = special_jvm_flags[i]; 642 return true; 643 } 644 } 645 return false; 646 } 647 648 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 649 assert(version != NULL, "Must provide a version buffer"); 650 SpecialFlag flag; 651 if (lookup_special_flag(flag_name, flag)) { 652 if (!flag.obsolete_in.is_undefined()) { 653 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 654 *version = flag.obsolete_in; 655 return true; 656 } 657 } 658 } 659 return false; 660 } 661 662 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 663 assert(version != NULL, "Must provide a version buffer"); 664 SpecialFlag flag; 665 if (lookup_special_flag(flag_name, flag)) { 666 if (!flag.deprecated_in.is_undefined()) { 667 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 668 version_less_than(JDK_Version::current(), flag.expired_in)) { 669 *version = flag.deprecated_in; 670 return 1; 671 } else { 672 return -1; 673 } 674 } 675 } 676 return 0; 677 } 678 679 #ifndef PRODUCT 680 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 681 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 682 const AliasedFlag& flag = removed_develop_logging_flags[i]; 683 if (strcmp(flag.alias_name, name) == 0) { 684 return flag.real_name; 685 } 686 } 687 return NULL; 688 } 689 #endif // PRODUCT 690 691 const char* Arguments::real_flag_name(const char *flag_name) { 692 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 693 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 694 if (strcmp(flag_status.alias_name, flag_name) == 0) { 695 return flag_status.real_name; 696 } 697 } 698 return flag_name; 699 } 700 701 #ifdef ASSERT 702 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 703 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 704 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 705 return true; 706 } 707 } 708 return false; 709 } 710 711 // Verifies the correctness of the entries in the special_jvm_flags table. 712 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 713 // version being earlier than the deprecation version, then a warning is issued 714 // and verification fails - by returning false. If it is detected that the table 715 // is out of date, with respect to the current version, then a warning is issued 716 // but verification does not fail. This allows the VM to operate when the version 717 // is first updated, without needing to update all the impacted flags at the 718 // same time. 719 static bool verify_special_jvm_flags() { 720 bool success = true; 721 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 722 const SpecialFlag& flag = special_jvm_flags[i]; 723 if (lookup_special_flag(flag.name, i)) { 724 warning("Duplicate special flag declaration \"%s\"", flag.name); 725 success = false; 726 } 727 if (flag.deprecated_in.is_undefined() && 728 flag.obsolete_in.is_undefined()) { 729 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 730 success = false; 731 } 732 733 if (!flag.deprecated_in.is_undefined()) { 734 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 735 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 736 success = false; 737 } 738 739 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 740 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 741 success = false; 742 } 743 } 744 745 if (!flag.obsolete_in.is_undefined()) { 746 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 747 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 748 success = false; 749 } 750 751 // if flag has become obsolete it should not have a "globals" flag defined anymore. 752 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 753 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 754 // Temporarily disable the warning: 8196739 755 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 756 } 757 } 758 } 759 760 if (!flag.expired_in.is_undefined()) { 761 // if flag has become expired it should not have a "globals" flag defined anymore. 762 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 763 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 764 // Temporarily disable the warning: 8196739 765 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 766 } 767 } 768 } 769 770 } 771 return success; 772 } 773 #endif 774 775 // Parses a size specification string. 776 bool Arguments::atojulong(const char *s, julong* result) { 777 julong n = 0; 778 779 // First char must be a digit. Don't allow negative numbers or leading spaces. 780 if (!isdigit(*s)) { 781 return false; 782 } 783 784 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 785 char* remainder; 786 errno = 0; 787 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 788 if (errno != 0) { 789 return false; 790 } 791 792 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 793 if (remainder == s || strlen(remainder) > 1) { 794 return false; 795 } 796 797 switch (*remainder) { 798 case 'T': case 't': 799 *result = n * G * K; 800 // Check for overflow. 801 if (*result/((julong)G * K) != n) return false; 802 return true; 803 case 'G': case 'g': 804 *result = n * G; 805 if (*result/G != n) return false; 806 return true; 807 case 'M': case 'm': 808 *result = n * M; 809 if (*result/M != n) return false; 810 return true; 811 case 'K': case 'k': 812 *result = n * K; 813 if (*result/K != n) return false; 814 return true; 815 case '\0': 816 *result = n; 817 return true; 818 default: 819 return false; 820 } 821 } 822 823 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 824 if (size < min_size) return arg_too_small; 825 if (size > max_size) return arg_too_big; 826 return arg_in_range; 827 } 828 829 // Describe an argument out of range error 830 void Arguments::describe_range_error(ArgsRange errcode) { 831 switch(errcode) { 832 case arg_too_big: 833 jio_fprintf(defaultStream::error_stream(), 834 "The specified size exceeds the maximum " 835 "representable size.\n"); 836 break; 837 case arg_too_small: 838 case arg_unreadable: 839 case arg_in_range: 840 // do nothing for now 841 break; 842 default: 843 ShouldNotReachHere(); 844 } 845 } 846 847 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) { 848 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) { 849 return true; 850 } else { 851 return false; 852 } 853 } 854 855 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 856 char* end; 857 errno = 0; 858 double v = strtod(value, &end); 859 if ((errno != 0) || (*end != 0)) { 860 return false; 861 } 862 863 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) { 864 return true; 865 } 866 return false; 867 } 868 869 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 870 julong v; 871 int int_v; 872 intx intx_v; 873 bool is_neg = false; 874 875 if (flag == NULL) { 876 return false; 877 } 878 879 // Check the sign first since atojulong() parses only unsigned values. 880 if (*value == '-') { 881 if (!flag->is_intx() && !flag->is_int()) { 882 return false; 883 } 884 value++; 885 is_neg = true; 886 } 887 if (!Arguments::atojulong(value, &v)) { 888 return false; 889 } 890 if (flag->is_int()) { 891 int_v = (int) v; 892 if (is_neg) { 893 int_v = -int_v; 894 } 895 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS; 896 } else if (flag->is_uint()) { 897 uint uint_v = (uint) v; 898 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS; 899 } else if (flag->is_intx()) { 900 intx_v = (intx) v; 901 if (is_neg) { 902 intx_v = -intx_v; 903 } 904 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS; 905 } else if (flag->is_uintx()) { 906 uintx uintx_v = (uintx) v; 907 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS; 908 } else if (flag->is_uint64_t()) { 909 uint64_t uint64_t_v = (uint64_t) v; 910 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS; 911 } else if (flag->is_size_t()) { 912 size_t size_t_v = (size_t) v; 913 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS; 914 } else if (flag->is_double()) { 915 double double_v = (double) v; 916 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS; 917 } else { 918 return false; 919 } 920 } 921 922 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) { 923 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false; 924 // Contract: JVMFlag always returns a pointer that needs freeing. 925 FREE_C_HEAP_ARRAY(char, value); 926 return true; 927 } 928 929 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) { 930 const char* old_value = ""; 931 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false; 932 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 933 size_t new_len = strlen(new_value); 934 const char* value; 935 char* free_this_too = NULL; 936 if (old_len == 0) { 937 value = new_value; 938 } else if (new_len == 0) { 939 value = old_value; 940 } else { 941 size_t length = old_len + 1 + new_len + 1; 942 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 943 // each new setting adds another LINE to the switch: 944 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 945 value = buf; 946 free_this_too = buf; 947 } 948 (void) JVMFlag::ccstrAtPut(flag, &value, origin); 949 // JVMFlag always returns a pointer that needs freeing. 950 FREE_C_HEAP_ARRAY(char, value); 951 if (free_this_too != NULL) { 952 // JVMFlag made its own copy, so I must delete my own temp. buffer. 953 FREE_C_HEAP_ARRAY(char, free_this_too); 954 } 955 return true; 956 } 957 958 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 959 const char* real_name = real_flag_name(arg); 960 JDK_Version since = JDK_Version(); 961 switch (is_deprecated_flag(arg, &since)) { 962 case -1: 963 return NULL; // obsolete or expired, don't process normally 964 case 0: 965 return real_name; 966 case 1: { 967 if (warn) { 968 char version[256]; 969 since.to_string(version, sizeof(version)); 970 if (real_name != arg) { 971 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 972 arg, version, real_name); 973 } else { 974 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 975 arg, version); 976 } 977 } 978 return real_name; 979 } 980 } 981 ShouldNotReachHere(); 982 return NULL; 983 } 984 985 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 986 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 987 // Set tagset string buffer at max size of 256, large enough for any alias tagset 988 const int max_tagset_size = 256; 989 int max_tagset_len = max_tagset_size - 1; 990 char tagset_buffer[max_tagset_size]; 991 tagset_buffer[0] = '\0'; 992 993 // Write tag-set for aliased logging option, in string list form 994 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 995 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 996 if (i > 0) { 997 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 998 } 999 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 1000 } 1001 if (!alf.exactMatch) { 1002 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 1003 } 1004 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 1005 (on) ? "+" : "-", 1006 name, 1007 tagset_buffer, 1008 (on) ? LogLevel::name(alf.level) : "off"); 1009 } 1010 1011 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 1012 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 1013 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1014 if (strcmp(alf.alias_name, name) == 0) { 1015 log_deprecated_flag(name, on, alf); 1016 return alf; 1017 } 1018 } 1019 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1020 return a; 1021 } 1022 1023 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) { 1024 1025 // range of acceptable characters spelled out for portability reasons 1026 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1027 #define BUFLEN 255 1028 char name[BUFLEN+1]; 1029 char dummy; 1030 const char* real_name; 1031 bool warn_if_deprecated = true; 1032 1033 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1034 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1035 if (alf.alias_name != NULL){ 1036 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1037 return true; 1038 } 1039 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1040 if (real_name == NULL) { 1041 return false; 1042 } 1043 JVMFlag* flag = JVMFlag::find_flag(real_name); 1044 return set_bool_flag(flag, false, origin); 1045 } 1046 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1047 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1048 if (alf.alias_name != NULL){ 1049 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1050 return true; 1051 } 1052 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1053 if (real_name == NULL) { 1054 return false; 1055 } 1056 JVMFlag* flag = JVMFlag::find_flag(real_name); 1057 return set_bool_flag(flag, true, origin); 1058 } 1059 1060 char punct; 1061 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1062 const char* value = strchr(arg, '=') + 1; 1063 1064 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1065 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1066 if (alf.alias_name != NULL) { 1067 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1068 return true; 1069 } 1070 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1071 if (real_name == NULL) { 1072 return false; 1073 } 1074 JVMFlag* flag = JVMFlag::find_flag(real_name); 1075 if (flag != NULL && flag->is_ccstr()) { 1076 if (flag->ccstr_accumulates()) { 1077 return append_to_string_flag(flag, value, origin); 1078 } else { 1079 if (value[0] == '\0') { 1080 value = NULL; 1081 } 1082 return set_string_flag(flag, value, origin); 1083 } 1084 } else { 1085 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1086 } 1087 } 1088 1089 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1090 const char* value = strchr(arg, '=') + 1; 1091 // -XX:Foo:=xxx will reset the string flag to the given value. 1092 if (value[0] == '\0') { 1093 value = NULL; 1094 } 1095 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1096 if (real_name == NULL) { 1097 return false; 1098 } 1099 JVMFlag* flag = JVMFlag::find_flag(real_name); 1100 return set_string_flag(flag, value, origin); 1101 } 1102 1103 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1104 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1105 #define NUMBER_RANGE "[0123456789eE+-]" 1106 char value[BUFLEN + 1]; 1107 char value2[BUFLEN + 1]; 1108 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1109 // Looks like a floating-point number -- try again with more lenient format string 1110 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1111 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1112 if (real_name == NULL) { 1113 return false; 1114 } 1115 JVMFlag* flag = JVMFlag::find_flag(real_name); 1116 return set_fp_numeric_flag(flag, value, origin); 1117 } 1118 } 1119 1120 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1121 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1122 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1123 if (real_name == NULL) { 1124 return false; 1125 } 1126 JVMFlag* flag = JVMFlag::find_flag(real_name); 1127 return set_numeric_flag(flag, value, origin); 1128 } 1129 1130 return false; 1131 } 1132 1133 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1134 assert(bldarray != NULL, "illegal argument"); 1135 1136 if (arg == NULL) { 1137 return; 1138 } 1139 1140 int new_count = *count + 1; 1141 1142 // expand the array and add arg to the last element 1143 if (*bldarray == NULL) { 1144 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1145 } else { 1146 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1147 } 1148 (*bldarray)[*count] = os::strdup_check_oom(arg); 1149 *count = new_count; 1150 } 1151 1152 void Arguments::build_jvm_args(const char* arg) { 1153 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1154 } 1155 1156 void Arguments::build_jvm_flags(const char* arg) { 1157 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1158 } 1159 1160 // utility function to return a string that concatenates all 1161 // strings in a given char** array 1162 const char* Arguments::build_resource_string(char** args, int count) { 1163 if (args == NULL || count == 0) { 1164 return NULL; 1165 } 1166 size_t length = 0; 1167 for (int i = 0; i < count; i++) { 1168 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1169 } 1170 char* s = NEW_RESOURCE_ARRAY(char, length); 1171 char* dst = s; 1172 for (int j = 0; j < count; j++) { 1173 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1174 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1175 dst += offset; 1176 length -= offset; 1177 } 1178 return (const char*) s; 1179 } 1180 1181 void Arguments::print_on(outputStream* st) { 1182 st->print_cr("VM Arguments:"); 1183 if (num_jvm_flags() > 0) { 1184 st->print("jvm_flags: "); print_jvm_flags_on(st); 1185 st->cr(); 1186 } 1187 if (num_jvm_args() > 0) { 1188 st->print("jvm_args: "); print_jvm_args_on(st); 1189 st->cr(); 1190 } 1191 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1192 if (_java_class_path != NULL) { 1193 char* path = _java_class_path->value(); 1194 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1195 } 1196 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1197 } 1198 1199 void Arguments::print_summary_on(outputStream* st) { 1200 // Print the command line. Environment variables that are helpful for 1201 // reproducing the problem are written later in the hs_err file. 1202 // flags are from setting file 1203 if (num_jvm_flags() > 0) { 1204 st->print_raw("Settings File: "); 1205 print_jvm_flags_on(st); 1206 st->cr(); 1207 } 1208 // args are the command line and environment variable arguments. 1209 st->print_raw("Command Line: "); 1210 if (num_jvm_args() > 0) { 1211 print_jvm_args_on(st); 1212 } 1213 // this is the classfile and any arguments to the java program 1214 if (java_command() != NULL) { 1215 st->print("%s", java_command()); 1216 } 1217 st->cr(); 1218 } 1219 1220 void Arguments::print_jvm_flags_on(outputStream* st) { 1221 if (_num_jvm_flags > 0) { 1222 for (int i=0; i < _num_jvm_flags; i++) { 1223 st->print("%s ", _jvm_flags_array[i]); 1224 } 1225 } 1226 } 1227 1228 void Arguments::print_jvm_args_on(outputStream* st) { 1229 if (_num_jvm_args > 0) { 1230 for (int i=0; i < _num_jvm_args; i++) { 1231 st->print("%s ", _jvm_args_array[i]); 1232 } 1233 } 1234 } 1235 1236 bool Arguments::process_argument(const char* arg, 1237 jboolean ignore_unrecognized, 1238 JVMFlag::Flags origin) { 1239 JDK_Version since = JDK_Version(); 1240 1241 if (parse_argument(arg, origin)) { 1242 return true; 1243 } 1244 1245 // Determine if the flag has '+', '-', or '=' characters. 1246 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1247 const char* const argname = has_plus_minus ? arg + 1 : arg; 1248 1249 size_t arg_len; 1250 const char* equal_sign = strchr(argname, '='); 1251 if (equal_sign == NULL) { 1252 arg_len = strlen(argname); 1253 } else { 1254 arg_len = equal_sign - argname; 1255 } 1256 1257 // Only make the obsolete check for valid arguments. 1258 if (arg_len <= BUFLEN) { 1259 // Construct a string which consists only of the argument name without '+', '-', or '='. 1260 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1261 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1262 if (is_obsolete_flag(stripped_argname, &since)) { 1263 char version[256]; 1264 since.to_string(version, sizeof(version)); 1265 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1266 return true; 1267 } 1268 #ifndef PRODUCT 1269 else { 1270 const char* replacement; 1271 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1272 log_warning(arguments)("%s has been removed. Please use %s instead.", 1273 stripped_argname, 1274 replacement); 1275 return false; 1276 } 1277 } 1278 #endif //PRODUCT 1279 } 1280 1281 // For locked flags, report a custom error message if available. 1282 // Otherwise, report the standard unrecognized VM option. 1283 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1284 if (found_flag != NULL) { 1285 char locked_message_buf[BUFLEN]; 1286 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1287 if (strlen(locked_message_buf) == 0) { 1288 if (found_flag->is_bool() && !has_plus_minus) { 1289 jio_fprintf(defaultStream::error_stream(), 1290 "Missing +/- setting for VM option '%s'\n", argname); 1291 } else if (!found_flag->is_bool() && has_plus_minus) { 1292 jio_fprintf(defaultStream::error_stream(), 1293 "Unexpected +/- setting in VM option '%s'\n", argname); 1294 } else { 1295 jio_fprintf(defaultStream::error_stream(), 1296 "Improperly specified VM option '%s'\n", argname); 1297 } 1298 } else { 1299 #ifdef PRODUCT 1300 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1301 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1302 if (ignore_unrecognized && mismatched) { 1303 return true; 1304 } 1305 #endif 1306 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1307 } 1308 } else { 1309 if (ignore_unrecognized) { 1310 return true; 1311 } 1312 jio_fprintf(defaultStream::error_stream(), 1313 "Unrecognized VM option '%s'\n", argname); 1314 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1315 if (fuzzy_matched != NULL) { 1316 jio_fprintf(defaultStream::error_stream(), 1317 "Did you mean '%s%s%s'? ", 1318 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1319 fuzzy_matched->_name, 1320 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1321 } 1322 } 1323 1324 // allow for commandline "commenting out" options like -XX:#+Verbose 1325 return arg[0] == '#'; 1326 } 1327 1328 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1329 FILE* stream = fopen(file_name, "rb"); 1330 if (stream == NULL) { 1331 if (should_exist) { 1332 jio_fprintf(defaultStream::error_stream(), 1333 "Could not open settings file %s\n", file_name); 1334 return false; 1335 } else { 1336 return true; 1337 } 1338 } 1339 1340 char token[1024]; 1341 int pos = 0; 1342 1343 bool in_white_space = true; 1344 bool in_comment = false; 1345 bool in_quote = false; 1346 char quote_c = 0; 1347 bool result = true; 1348 1349 int c = getc(stream); 1350 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1351 if (in_white_space) { 1352 if (in_comment) { 1353 if (c == '\n') in_comment = false; 1354 } else { 1355 if (c == '#') in_comment = true; 1356 else if (!isspace(c)) { 1357 in_white_space = false; 1358 token[pos++] = c; 1359 } 1360 } 1361 } else { 1362 if (c == '\n' || (!in_quote && isspace(c))) { 1363 // token ends at newline, or at unquoted whitespace 1364 // this allows a way to include spaces in string-valued options 1365 token[pos] = '\0'; 1366 logOption(token); 1367 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1368 build_jvm_flags(token); 1369 pos = 0; 1370 in_white_space = true; 1371 in_quote = false; 1372 } else if (!in_quote && (c == '\'' || c == '"')) { 1373 in_quote = true; 1374 quote_c = c; 1375 } else if (in_quote && (c == quote_c)) { 1376 in_quote = false; 1377 } else { 1378 token[pos++] = c; 1379 } 1380 } 1381 c = getc(stream); 1382 } 1383 if (pos > 0) { 1384 token[pos] = '\0'; 1385 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1386 build_jvm_flags(token); 1387 } 1388 fclose(stream); 1389 return result; 1390 } 1391 1392 //============================================================================================================= 1393 // Parsing of properties (-D) 1394 1395 const char* Arguments::get_property(const char* key) { 1396 return PropertyList_get_value(system_properties(), key); 1397 } 1398 1399 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1400 const char* eq = strchr(prop, '='); 1401 const char* key; 1402 const char* value = ""; 1403 1404 if (eq == NULL) { 1405 // property doesn't have a value, thus use passed string 1406 key = prop; 1407 } else { 1408 // property have a value, thus extract it and save to the 1409 // allocated string 1410 size_t key_len = eq - prop; 1411 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1412 1413 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1414 key = tmp_key; 1415 1416 value = &prop[key_len + 1]; 1417 } 1418 1419 if (strcmp(key, "java.compiler") == 0) { 1420 process_java_compiler_argument(value); 1421 // Record value in Arguments, but let it get passed to Java. 1422 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1423 strcmp(key, "sun.java.launcher.pid") == 0) { 1424 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1425 // private and are processed in process_sun_java_launcher_properties(); 1426 // the sun.java.launcher property is passed on to the java application 1427 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1428 // append is true, writable is true, internal is false 1429 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1430 WriteableProperty, ExternalProperty); 1431 } else { 1432 if (strcmp(key, "sun.java.command") == 0) { 1433 char *old_java_command = _java_command; 1434 _java_command = os::strdup_check_oom(value, mtArguments); 1435 if (old_java_command != NULL) { 1436 os::free(old_java_command); 1437 } 1438 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1439 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1440 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1441 // its value without going through the property list or making a Java call. 1442 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1443 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1444 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1445 os::free((void *)old_java_vendor_url_bug); 1446 } 1447 } 1448 1449 // Create new property and add at the end of the list 1450 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1451 } 1452 1453 if (key != prop) { 1454 // SystemProperty copy passed value, thus free previously allocated 1455 // memory 1456 FreeHeap((void *)key); 1457 } 1458 1459 return true; 1460 } 1461 1462 #if INCLUDE_CDS 1463 const char* unsupported_properties[] = { "jdk.module.limitmods", 1464 "jdk.module.upgrade.path", 1465 "jdk.module.patch.0" }; 1466 const char* unsupported_options[] = { "--limit-modules", 1467 "--upgrade-module-path", 1468 "--patch-module" 1469 }; 1470 void Arguments::check_unsupported_dumping_properties() { 1471 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, 1472 "this function is only used with CDS dump time"); 1473 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1474 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1475 SystemProperty* sp = system_properties(); 1476 while (sp != NULL) { 1477 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1478 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1479 vm_exit_during_initialization( 1480 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1481 } 1482 } 1483 sp = sp->next(); 1484 } 1485 1486 // Check for an exploded module build in use with -Xshare:dump. 1487 if (!has_jimage()) { 1488 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1489 } 1490 } 1491 1492 bool Arguments::check_unsupported_cds_runtime_properties() { 1493 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1494 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1495 if (ArchiveClassesAtExit != NULL) { 1496 // dynamic dumping, just return false for now. 1497 // check_unsupported_dumping_properties() will be called later to check the same set of 1498 // properties, and will exit the VM with the correct error message if the unsupported properties 1499 // are used. 1500 return false; 1501 } 1502 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1503 if (get_property(unsupported_properties[i]) != NULL) { 1504 if (RequireSharedSpaces) { 1505 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1506 } 1507 return true; 1508 } 1509 } 1510 return false; 1511 } 1512 #endif 1513 1514 //=========================================================================================================== 1515 // Setting int/mixed/comp mode flags 1516 1517 void Arguments::set_mode_flags(Mode mode) { 1518 // Set up default values for all flags. 1519 // If you add a flag to any of the branches below, 1520 // add a default value for it here. 1521 set_java_compiler(false); 1522 _mode = mode; 1523 1524 // Ensure Agent_OnLoad has the correct initial values. 1525 // This may not be the final mode; mode may change later in onload phase. 1526 PropertyList_unique_add(&_system_properties, "java.vm.info", 1527 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1528 1529 UseInterpreter = true; 1530 UseCompiler = true; 1531 UseLoopCounter = true; 1532 1533 // Default values may be platform/compiler dependent - 1534 // use the saved values 1535 ClipInlining = Arguments::_ClipInlining; 1536 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1537 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1538 BackgroundCompilation = Arguments::_BackgroundCompilation; 1539 if (TieredCompilation) { 1540 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1541 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1542 } 1543 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1544 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1545 } 1546 } 1547 1548 // Change from defaults based on mode 1549 switch (mode) { 1550 default: 1551 ShouldNotReachHere(); 1552 break; 1553 case _int: 1554 UseCompiler = false; 1555 UseLoopCounter = false; 1556 AlwaysCompileLoopMethods = false; 1557 UseOnStackReplacement = false; 1558 break; 1559 case _mixed: 1560 // same as default 1561 break; 1562 case _comp: 1563 UseInterpreter = false; 1564 BackgroundCompilation = false; 1565 ClipInlining = false; 1566 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1567 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1568 // compile a level 4 (C2) and then continue executing it. 1569 if (TieredCompilation) { 1570 Tier3InvokeNotifyFreqLog = 0; 1571 Tier4InvocationThreshold = 0; 1572 } 1573 break; 1574 } 1575 } 1576 1577 // Conflict: required to use shared spaces (-Xshare:on), but 1578 // incompatible command line options were chosen. 1579 static void no_shared_spaces(const char* message) { 1580 if (RequireSharedSpaces) { 1581 jio_fprintf(defaultStream::error_stream(), 1582 "Class data sharing is inconsistent with other specified options.\n"); 1583 vm_exit_during_initialization("Unable to use shared archive", message); 1584 } else { 1585 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1586 } 1587 } 1588 1589 void set_object_alignment() { 1590 // Object alignment. 1591 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1592 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1593 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1594 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1595 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1596 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1597 1598 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1599 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1600 1601 // Oop encoding heap max 1602 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1603 1604 if (SurvivorAlignmentInBytes == 0) { 1605 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1606 } 1607 } 1608 1609 size_t Arguments::max_heap_for_compressed_oops() { 1610 // Avoid sign flip. 1611 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1612 // We need to fit both the NULL page and the heap into the memory budget, while 1613 // keeping alignment constraints of the heap. To guarantee the latter, as the 1614 // NULL page is located before the heap, we pad the NULL page to the conservative 1615 // maximum alignment that the GC may ever impose upon the heap. 1616 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1617 _conservative_max_heap_alignment); 1618 1619 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1620 NOT_LP64(ShouldNotReachHere(); return 0); 1621 } 1622 1623 void Arguments::set_use_compressed_oops() { 1624 #ifndef ZERO 1625 #ifdef _LP64 1626 // MaxHeapSize is not set up properly at this point, but 1627 // the only value that can override MaxHeapSize if we are 1628 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1629 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1630 1631 if (max_heap_size <= max_heap_for_compressed_oops()) { 1632 #if !defined(COMPILER1) || defined(TIERED) 1633 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1634 FLAG_SET_ERGO(UseCompressedOops, true); 1635 } 1636 #endif 1637 } else { 1638 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1639 warning("Max heap size too large for Compressed Oops"); 1640 FLAG_SET_DEFAULT(UseCompressedOops, false); 1641 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1642 } 1643 } 1644 #endif // _LP64 1645 #endif // ZERO 1646 } 1647 1648 1649 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1650 // set_use_compressed_oops(). 1651 void Arguments::set_use_compressed_klass_ptrs() { 1652 #ifndef ZERO 1653 #ifdef _LP64 1654 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1655 if (!UseCompressedOops) { 1656 if (UseCompressedClassPointers) { 1657 warning("UseCompressedClassPointers requires UseCompressedOops"); 1658 } 1659 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1660 } else { 1661 // Turn on UseCompressedClassPointers too 1662 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1663 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1664 } 1665 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1666 if (UseCompressedClassPointers) { 1667 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1668 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1669 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1670 } 1671 } 1672 } 1673 #endif // _LP64 1674 #endif // !ZERO 1675 } 1676 1677 void Arguments::set_conservative_max_heap_alignment() { 1678 // The conservative maximum required alignment for the heap is the maximum of 1679 // the alignments imposed by several sources: any requirements from the heap 1680 // itself and the maximum page size we may run the VM with. 1681 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1682 _conservative_max_heap_alignment = MAX4(heap_alignment, 1683 (size_t)os::vm_allocation_granularity(), 1684 os::max_page_size(), 1685 GCArguments::compute_heap_alignment()); 1686 } 1687 1688 jint Arguments::set_ergonomics_flags() { 1689 GCConfig::initialize(); 1690 1691 set_conservative_max_heap_alignment(); 1692 1693 #ifndef ZERO 1694 #ifdef _LP64 1695 set_use_compressed_oops(); 1696 1697 // set_use_compressed_klass_ptrs() must be called after calling 1698 // set_use_compressed_oops(). 1699 set_use_compressed_klass_ptrs(); 1700 1701 // Also checks that certain machines are slower with compressed oops 1702 // in vm_version initialization code. 1703 #endif // _LP64 1704 #endif // !ZERO 1705 1706 return JNI_OK; 1707 } 1708 1709 julong Arguments::limit_by_allocatable_memory(julong limit) { 1710 julong max_allocatable; 1711 julong result = limit; 1712 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1713 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1714 } 1715 return result; 1716 } 1717 1718 // Use static initialization to get the default before parsing 1719 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1720 1721 void Arguments::set_heap_size() { 1722 julong phys_mem; 1723 1724 // If the user specified one of these options, they 1725 // want specific memory sizing so do not limit memory 1726 // based on compressed oops addressability. 1727 // Also, memory limits will be calculated based on 1728 // available os physical memory, not our MaxRAM limit, 1729 // unless MaxRAM is also specified. 1730 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1731 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1732 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1733 !FLAG_IS_DEFAULT(MinRAMFraction) || 1734 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1735 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1736 !FLAG_IS_DEFAULT(MaxRAM)); 1737 if (override_coop_limit) { 1738 if (FLAG_IS_DEFAULT(MaxRAM)) { 1739 phys_mem = os::physical_memory(); 1740 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1741 } else { 1742 phys_mem = (julong)MaxRAM; 1743 } 1744 } else { 1745 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1746 : (julong)MaxRAM; 1747 } 1748 1749 1750 // Convert deprecated flags 1751 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1752 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1753 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1754 1755 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1756 !FLAG_IS_DEFAULT(MinRAMFraction)) 1757 MinRAMPercentage = 100.0 / MinRAMFraction; 1758 1759 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1760 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1761 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1762 1763 // If the maximum heap size has not been set with -Xmx, 1764 // then set it as fraction of the size of physical memory, 1765 // respecting the maximum and minimum sizes of the heap. 1766 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1767 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1768 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1769 if (reasonable_min < MaxHeapSize) { 1770 // Small physical memory, so use a minimum fraction of it for the heap 1771 reasonable_max = reasonable_min; 1772 } else { 1773 // Not-small physical memory, so require a heap at least 1774 // as large as MaxHeapSize 1775 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1776 } 1777 1778 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1779 // Limit the heap size to ErgoHeapSizeLimit 1780 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1781 } 1782 1783 #ifdef _LP64 1784 if (UseCompressedOops) { 1785 // Limit the heap size to the maximum possible when using compressed oops 1786 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1787 1788 // HeapBaseMinAddress can be greater than default but not less than. 1789 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1790 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1791 // matches compressed oops printing flags 1792 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1793 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1794 DefaultHeapBaseMinAddress, 1795 DefaultHeapBaseMinAddress/G, 1796 HeapBaseMinAddress); 1797 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1798 } 1799 } 1800 1801 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1802 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1803 // but it should be not less than default MaxHeapSize. 1804 max_coop_heap -= HeapBaseMinAddress; 1805 } 1806 1807 // If user specified flags prioritizing os physical 1808 // memory limits, then disable compressed oops if 1809 // limits exceed max_coop_heap and UseCompressedOops 1810 // was not specified. 1811 if (reasonable_max > max_coop_heap) { 1812 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1813 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1814 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1815 "Please check the setting of MaxRAMPercentage %5.2f." 1816 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1817 FLAG_SET_ERGO(UseCompressedOops, false); 1818 FLAG_SET_ERGO(UseCompressedClassPointers, false); 1819 } else { 1820 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1821 } 1822 } 1823 } 1824 #endif // _LP64 1825 1826 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1827 1828 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1829 // An initial heap size was specified on the command line, 1830 // so be sure that the maximum size is consistent. Done 1831 // after call to limit_by_allocatable_memory because that 1832 // method might reduce the allocation size. 1833 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1834 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1835 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1836 } 1837 1838 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1839 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1840 } 1841 1842 // If the minimum or initial heap_size have not been set or requested to be set 1843 // ergonomically, set them accordingly. 1844 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1845 julong reasonable_minimum = (julong)(OldSize + NewSize); 1846 1847 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1848 1849 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1850 1851 if (InitialHeapSize == 0) { 1852 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1853 1854 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1855 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1856 1857 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1858 1859 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1860 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1861 } 1862 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1863 // synchronize with InitialHeapSize to avoid errors with the default value. 1864 if (MinHeapSize == 0) { 1865 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1866 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1867 } 1868 } 1869 } 1870 1871 // This option inspects the machine and attempts to set various 1872 // parameters to be optimal for long-running, memory allocation 1873 // intensive jobs. It is intended for machines with large 1874 // amounts of cpu and memory. 1875 jint Arguments::set_aggressive_heap_flags() { 1876 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1877 // VM, but we may not be able to represent the total physical memory 1878 // available (like having 8gb of memory on a box but using a 32bit VM). 1879 // Thus, we need to make sure we're using a julong for intermediate 1880 // calculations. 1881 julong initHeapSize; 1882 julong total_memory = os::physical_memory(); 1883 1884 if (total_memory < (julong) 256 * M) { 1885 jio_fprintf(defaultStream::error_stream(), 1886 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1887 vm_exit(1); 1888 } 1889 1890 // The heap size is half of available memory, or (at most) 1891 // all of possible memory less 160mb (leaving room for the OS 1892 // when using ISM). This is the maximum; because adaptive sizing 1893 // is turned on below, the actual space used may be smaller. 1894 1895 initHeapSize = MIN2(total_memory / (julong) 2, 1896 total_memory - (julong) 160 * M); 1897 1898 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1899 1900 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1901 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1902 return JNI_EINVAL; 1903 } 1904 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1905 return JNI_EINVAL; 1906 } 1907 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1908 return JNI_EINVAL; 1909 } 1910 } 1911 if (FLAG_IS_DEFAULT(NewSize)) { 1912 // Make the young generation 3/8ths of the total heap. 1913 if (FLAG_SET_CMDLINE(NewSize, 1914 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1915 return JNI_EINVAL; 1916 } 1917 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1918 return JNI_EINVAL; 1919 } 1920 } 1921 1922 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1923 FLAG_SET_DEFAULT(UseLargePages, true); 1924 #endif 1925 1926 // Increase some data structure sizes for efficiency 1927 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1928 return JNI_EINVAL; 1929 } 1930 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1931 return JNI_EINVAL; 1932 } 1933 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1934 return JNI_EINVAL; 1935 } 1936 1937 // See the OldPLABSize comment below, but replace 'after promotion' 1938 // with 'after copying'. YoungPLABSize is the size of the survivor 1939 // space per-gc-thread buffers. The default is 4kw. 1940 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1941 return JNI_EINVAL; 1942 } 1943 1944 // OldPLABSize is the size of the buffers in the old gen that 1945 // UseParallelGC uses to promote live data that doesn't fit in the 1946 // survivor spaces. At any given time, there's one for each gc thread. 1947 // The default size is 1kw. These buffers are rarely used, since the 1948 // survivor spaces are usually big enough. For specjbb, however, there 1949 // are occasions when there's lots of live data in the young gen 1950 // and we end up promoting some of it. We don't have a definite 1951 // explanation for why bumping OldPLABSize helps, but the theory 1952 // is that a bigger PLAB results in retaining something like the 1953 // original allocation order after promotion, which improves mutator 1954 // locality. A minor effect may be that larger PLABs reduce the 1955 // number of PLAB allocation events during gc. The value of 8kw 1956 // was arrived at by experimenting with specjbb. 1957 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1958 return JNI_EINVAL; 1959 } 1960 1961 // Enable parallel GC and adaptive generation sizing 1962 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1963 return JNI_EINVAL; 1964 } 1965 1966 // Encourage steady state memory management 1967 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1968 return JNI_EINVAL; 1969 } 1970 1971 // This appears to improve mutator locality 1972 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1973 return JNI_EINVAL; 1974 } 1975 1976 return JNI_OK; 1977 } 1978 1979 // This must be called after ergonomics. 1980 void Arguments::set_bytecode_flags() { 1981 if (!RewriteBytecodes) { 1982 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1983 } 1984 } 1985 1986 // Aggressive optimization flags 1987 jint Arguments::set_aggressive_opts_flags() { 1988 #ifdef COMPILER2 1989 if (AggressiveUnboxing) { 1990 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1991 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1992 } else if (!EliminateAutoBox) { 1993 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1994 AggressiveUnboxing = false; 1995 } 1996 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1997 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1998 } else if (!DoEscapeAnalysis) { 1999 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2000 AggressiveUnboxing = false; 2001 } 2002 } 2003 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2004 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2005 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2006 } 2007 // Feed the cache size setting into the JDK 2008 char buffer[1024]; 2009 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2010 if (!add_property(buffer)) { 2011 return JNI_ENOMEM; 2012 } 2013 } 2014 #endif 2015 2016 return JNI_OK; 2017 } 2018 2019 //=========================================================================================================== 2020 // Parsing of java.compiler property 2021 2022 void Arguments::process_java_compiler_argument(const char* arg) { 2023 // For backwards compatibility, Djava.compiler=NONE or "" 2024 // causes us to switch to -Xint mode UNLESS -Xdebug 2025 // is also specified. 2026 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2027 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2028 } 2029 } 2030 2031 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2032 _sun_java_launcher = os::strdup_check_oom(launcher); 2033 } 2034 2035 bool Arguments::created_by_java_launcher() { 2036 assert(_sun_java_launcher != NULL, "property must have value"); 2037 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2038 } 2039 2040 bool Arguments::sun_java_launcher_is_altjvm() { 2041 return _sun_java_launcher_is_altjvm; 2042 } 2043 2044 //=========================================================================================================== 2045 // Parsing of main arguments 2046 2047 unsigned int addreads_count = 0; 2048 unsigned int addexports_count = 0; 2049 unsigned int addopens_count = 0; 2050 unsigned int addmods_count = 0; 2051 unsigned int patch_mod_count = 0; 2052 2053 // Check the consistency of vm_init_args 2054 bool Arguments::check_vm_args_consistency() { 2055 // Method for adding checks for flag consistency. 2056 // The intent is to warn the user of all possible conflicts, 2057 // before returning an error. 2058 // Note: Needs platform-dependent factoring. 2059 bool status = true; 2060 2061 if (TLABRefillWasteFraction == 0) { 2062 jio_fprintf(defaultStream::error_stream(), 2063 "TLABRefillWasteFraction should be a denominator, " 2064 "not " SIZE_FORMAT "\n", 2065 TLABRefillWasteFraction); 2066 status = false; 2067 } 2068 2069 if (PrintNMTStatistics) { 2070 #if INCLUDE_NMT 2071 if (MemTracker::tracking_level() == NMT_off) { 2072 #endif // INCLUDE_NMT 2073 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2074 PrintNMTStatistics = false; 2075 #if INCLUDE_NMT 2076 } 2077 #endif 2078 } 2079 2080 status = CompilerConfig::check_args_consistency(status); 2081 #if INCLUDE_JVMCI 2082 if (status && EnableJVMCI) { 2083 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2084 AddProperty, UnwriteableProperty, InternalProperty); 2085 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2086 return false; 2087 } 2088 } 2089 #endif 2090 2091 #ifndef SUPPORT_RESERVED_STACK_AREA 2092 if (StackReservedPages != 0) { 2093 FLAG_SET_CMDLINE(StackReservedPages, 0); 2094 warning("Reserved Stack Area not supported on this platform"); 2095 } 2096 #endif 2097 2098 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2099 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2100 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2101 } 2102 } 2103 2104 status = status && GCArguments::check_args_consistency(); 2105 2106 return status; 2107 } 2108 2109 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2110 const char* option_type) { 2111 if (ignore) return false; 2112 2113 const char* spacer = " "; 2114 if (option_type == NULL) { 2115 option_type = ++spacer; // Set both to the empty string. 2116 } 2117 2118 jio_fprintf(defaultStream::error_stream(), 2119 "Unrecognized %s%soption: %s\n", option_type, spacer, 2120 option->optionString); 2121 return true; 2122 } 2123 2124 static const char* user_assertion_options[] = { 2125 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2126 }; 2127 2128 static const char* system_assertion_options[] = { 2129 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2130 }; 2131 2132 bool Arguments::parse_uintx(const char* value, 2133 uintx* uintx_arg, 2134 uintx min_size) { 2135 2136 // Check the sign first since atojulong() parses only unsigned values. 2137 bool value_is_positive = !(*value == '-'); 2138 2139 if (value_is_positive) { 2140 julong n; 2141 bool good_return = atojulong(value, &n); 2142 if (good_return) { 2143 bool above_minimum = n >= min_size; 2144 bool value_is_too_large = n > max_uintx; 2145 2146 if (above_minimum && !value_is_too_large) { 2147 *uintx_arg = n; 2148 return true; 2149 } 2150 } 2151 } 2152 return false; 2153 } 2154 2155 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2156 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2157 char* property = AllocateHeap(prop_len, mtArguments); 2158 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2159 if (ret < 0 || ret >= (int)prop_len) { 2160 FreeHeap(property); 2161 return false; 2162 } 2163 bool added = add_property(property, UnwriteableProperty, internal); 2164 FreeHeap(property); 2165 return added; 2166 } 2167 2168 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2169 const unsigned int props_count_limit = 1000; 2170 const int max_digits = 3; 2171 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2172 2173 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2174 if (count < props_count_limit) { 2175 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2176 char* property = AllocateHeap(prop_len, mtArguments); 2177 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2178 if (ret < 0 || ret >= (int)prop_len) { 2179 FreeHeap(property); 2180 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2181 return false; 2182 } 2183 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2184 FreeHeap(property); 2185 return added; 2186 } 2187 2188 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2189 return false; 2190 } 2191 2192 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2193 julong* long_arg, 2194 julong min_size, 2195 julong max_size) { 2196 if (!atojulong(s, long_arg)) return arg_unreadable; 2197 return check_memory_size(*long_arg, min_size, max_size); 2198 } 2199 2200 // Parse JavaVMInitArgs structure 2201 2202 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2203 const JavaVMInitArgs *java_options_args, 2204 const JavaVMInitArgs *cmd_line_args) { 2205 bool patch_mod_javabase = false; 2206 2207 // Save default settings for some mode flags 2208 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2209 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2210 Arguments::_ClipInlining = ClipInlining; 2211 Arguments::_BackgroundCompilation = BackgroundCompilation; 2212 if (TieredCompilation) { 2213 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2214 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2215 } 2216 2217 // Setup flags for mixed which is the default 2218 set_mode_flags(_mixed); 2219 2220 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2221 // variable (if present). 2222 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2223 if (result != JNI_OK) { 2224 return result; 2225 } 2226 2227 // Parse args structure generated from the command line flags. 2228 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE); 2229 if (result != JNI_OK) { 2230 return result; 2231 } 2232 2233 // Parse args structure generated from the _JAVA_OPTIONS environment 2234 // variable (if present) (mimics classic VM) 2235 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2236 if (result != JNI_OK) { 2237 return result; 2238 } 2239 2240 // We need to ensure processor and memory resources have been properly 2241 // configured - which may rely on arguments we just processed - before 2242 // doing the final argument processing. Any argument processing that 2243 // needs to know about processor and memory resources must occur after 2244 // this point. 2245 2246 os::init_container_support(); 2247 2248 // Do final processing now that all arguments have been parsed 2249 result = finalize_vm_init_args(patch_mod_javabase); 2250 if (result != JNI_OK) { 2251 return result; 2252 } 2253 2254 return JNI_OK; 2255 } 2256 2257 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2258 // represents a valid JDWP agent. is_path==true denotes that we 2259 // are dealing with -agentpath (case where name is a path), otherwise with 2260 // -agentlib 2261 bool valid_jdwp_agent(char *name, bool is_path) { 2262 char *_name; 2263 const char *_jdwp = "jdwp"; 2264 size_t _len_jdwp, _len_prefix; 2265 2266 if (is_path) { 2267 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2268 return false; 2269 } 2270 2271 _name++; // skip past last path separator 2272 _len_prefix = strlen(JNI_LIB_PREFIX); 2273 2274 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2275 return false; 2276 } 2277 2278 _name += _len_prefix; 2279 _len_jdwp = strlen(_jdwp); 2280 2281 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2282 _name += _len_jdwp; 2283 } 2284 else { 2285 return false; 2286 } 2287 2288 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2289 return false; 2290 } 2291 2292 return true; 2293 } 2294 2295 if (strcmp(name, _jdwp) == 0) { 2296 return true; 2297 } 2298 2299 return false; 2300 } 2301 2302 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2303 // --patch-module=<module>=<file>(<pathsep><file>)* 2304 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2305 // Find the equal sign between the module name and the path specification 2306 const char* module_equal = strchr(patch_mod_tail, '='); 2307 if (module_equal == NULL) { 2308 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2309 return JNI_ERR; 2310 } else { 2311 // Pick out the module name 2312 size_t module_len = module_equal - patch_mod_tail; 2313 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2314 if (module_name != NULL) { 2315 memcpy(module_name, patch_mod_tail, module_len); 2316 *(module_name + module_len) = '\0'; 2317 // The path piece begins one past the module_equal sign 2318 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2319 FREE_C_HEAP_ARRAY(char, module_name); 2320 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2321 return JNI_ENOMEM; 2322 } 2323 } else { 2324 return JNI_ENOMEM; 2325 } 2326 } 2327 return JNI_OK; 2328 } 2329 2330 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2331 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2332 // The min and max sizes match the values in globals.hpp, but scaled 2333 // with K. The values have been chosen so that alignment with page 2334 // size doesn't change the max value, which makes the conversions 2335 // back and forth between Xss value and ThreadStackSize value easier. 2336 // The values have also been chosen to fit inside a 32-bit signed type. 2337 const julong min_ThreadStackSize = 0; 2338 const julong max_ThreadStackSize = 1 * M; 2339 2340 const julong min_size = min_ThreadStackSize * K; 2341 const julong max_size = max_ThreadStackSize * K; 2342 2343 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2344 2345 julong size = 0; 2346 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2347 if (errcode != arg_in_range) { 2348 bool silent = (option == NULL); // Allow testing to silence error messages 2349 if (!silent) { 2350 jio_fprintf(defaultStream::error_stream(), 2351 "Invalid thread stack size: %s\n", option->optionString); 2352 describe_range_error(errcode); 2353 } 2354 return JNI_EINVAL; 2355 } 2356 2357 // Internally track ThreadStackSize in units of 1024 bytes. 2358 const julong size_aligned = align_up(size, K); 2359 assert(size <= size_aligned, 2360 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2361 size, size_aligned); 2362 2363 const julong size_in_K = size_aligned / K; 2364 assert(size_in_K < (julong)max_intx, 2365 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2366 size_in_K); 2367 2368 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2369 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2370 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2371 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2372 max_expanded, size_in_K); 2373 2374 *out_ThreadStackSize = (intx)size_in_K; 2375 2376 return JNI_OK; 2377 } 2378 2379 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) { 2380 // For match_option to return remaining or value part of option string 2381 const char* tail; 2382 2383 // iterate over arguments 2384 for (int index = 0; index < args->nOptions; index++) { 2385 bool is_absolute_path = false; // for -agentpath vs -agentlib 2386 2387 const JavaVMOption* option = args->options + index; 2388 2389 if (!match_option(option, "-Djava.class.path", &tail) && 2390 !match_option(option, "-Dsun.java.command", &tail) && 2391 !match_option(option, "-Dsun.java.launcher", &tail)) { 2392 2393 // add all jvm options to the jvm_args string. This string 2394 // is used later to set the java.vm.args PerfData string constant. 2395 // the -Djava.class.path and the -Dsun.java.command options are 2396 // omitted from jvm_args string as each have their own PerfData 2397 // string constant object. 2398 build_jvm_args(option->optionString); 2399 } 2400 2401 // -verbose:[class/module/gc/jni] 2402 if (match_option(option, "-verbose", &tail)) { 2403 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2404 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2405 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2406 } else if (!strcmp(tail, ":module")) { 2407 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2408 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2409 } else if (!strcmp(tail, ":gc")) { 2410 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2411 } else if (!strcmp(tail, ":jni")) { 2412 if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) { 2413 return JNI_EINVAL; 2414 } 2415 } 2416 // -da / -ea / -disableassertions / -enableassertions 2417 // These accept an optional class/package name separated by a colon, e.g., 2418 // -da:java.lang.Thread. 2419 } else if (match_option(option, user_assertion_options, &tail, true)) { 2420 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2421 if (*tail == '\0') { 2422 JavaAssertions::setUserClassDefault(enable); 2423 } else { 2424 assert(*tail == ':', "bogus match by match_option()"); 2425 JavaAssertions::addOption(tail + 1, enable); 2426 } 2427 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2428 } else if (match_option(option, system_assertion_options, &tail, false)) { 2429 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2430 JavaAssertions::setSystemClassDefault(enable); 2431 // -bootclasspath: 2432 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2433 jio_fprintf(defaultStream::output_stream(), 2434 "-Xbootclasspath is no longer a supported option.\n"); 2435 return JNI_EINVAL; 2436 // -bootclasspath/a: 2437 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2438 Arguments::append_sysclasspath(tail); 2439 // -bootclasspath/p: 2440 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2441 jio_fprintf(defaultStream::output_stream(), 2442 "-Xbootclasspath/p is no longer a supported option.\n"); 2443 return JNI_EINVAL; 2444 // -Xrun 2445 } else if (match_option(option, "-Xrun", &tail)) { 2446 if (tail != NULL) { 2447 const char* pos = strchr(tail, ':'); 2448 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2449 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2450 jio_snprintf(name, len + 1, "%s", tail); 2451 2452 char *options = NULL; 2453 if(pos != NULL) { 2454 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2455 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2456 } 2457 #if !INCLUDE_JVMTI 2458 if (strcmp(name, "jdwp") == 0) { 2459 jio_fprintf(defaultStream::error_stream(), 2460 "Debugging agents are not supported in this VM\n"); 2461 return JNI_ERR; 2462 } 2463 #endif // !INCLUDE_JVMTI 2464 add_init_library(name, options); 2465 } 2466 } else if (match_option(option, "--add-reads=", &tail)) { 2467 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2468 return JNI_ENOMEM; 2469 } 2470 } else if (match_option(option, "--add-exports=", &tail)) { 2471 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2472 return JNI_ENOMEM; 2473 } 2474 } else if (match_option(option, "--add-opens=", &tail)) { 2475 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2476 return JNI_ENOMEM; 2477 } 2478 } else if (match_option(option, "--add-modules=", &tail)) { 2479 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2480 return JNI_ENOMEM; 2481 } 2482 } else if (match_option(option, "--limit-modules=", &tail)) { 2483 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2484 return JNI_ENOMEM; 2485 } 2486 } else if (match_option(option, "--module-path=", &tail)) { 2487 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2488 return JNI_ENOMEM; 2489 } 2490 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2491 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2492 return JNI_ENOMEM; 2493 } 2494 } else if (match_option(option, "--patch-module=", &tail)) { 2495 // --patch-module=<module>=<file>(<pathsep><file>)* 2496 int res = process_patch_mod_option(tail, patch_mod_javabase); 2497 if (res != JNI_OK) { 2498 return res; 2499 } 2500 } else if (match_option(option, "--illegal-access=", &tail)) { 2501 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2502 return JNI_ENOMEM; 2503 } 2504 // -agentlib and -agentpath 2505 } else if (match_option(option, "-agentlib:", &tail) || 2506 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2507 if(tail != NULL) { 2508 const char* pos = strchr(tail, '='); 2509 char* name; 2510 if (pos == NULL) { 2511 name = os::strdup_check_oom(tail, mtArguments); 2512 } else { 2513 size_t len = pos - tail; 2514 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2515 memcpy(name, tail, len); 2516 name[len] = '\0'; 2517 } 2518 2519 char *options = NULL; 2520 if(pos != NULL) { 2521 options = os::strdup_check_oom(pos + 1, mtArguments); 2522 } 2523 #if !INCLUDE_JVMTI 2524 if (valid_jdwp_agent(name, is_absolute_path)) { 2525 jio_fprintf(defaultStream::error_stream(), 2526 "Debugging agents are not supported in this VM\n"); 2527 return JNI_ERR; 2528 } 2529 #endif // !INCLUDE_JVMTI 2530 add_init_agent(name, options, is_absolute_path); 2531 } 2532 // -javaagent 2533 } else if (match_option(option, "-javaagent:", &tail)) { 2534 #if !INCLUDE_JVMTI 2535 jio_fprintf(defaultStream::error_stream(), 2536 "Instrumentation agents are not supported in this VM\n"); 2537 return JNI_ERR; 2538 #else 2539 if (tail != NULL) { 2540 size_t length = strlen(tail) + 1; 2541 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2542 jio_snprintf(options, length, "%s", tail); 2543 add_instrument_agent("instrument", options, false); 2544 // java agents need module java.instrument 2545 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2546 return JNI_ENOMEM; 2547 } 2548 } 2549 #endif // !INCLUDE_JVMTI 2550 // --enable_preview 2551 } else if (match_option(option, "--enable-preview")) { 2552 set_enable_preview(); 2553 // -Xnoclassgc 2554 } else if (match_option(option, "-Xnoclassgc")) { 2555 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2556 return JNI_EINVAL; 2557 } 2558 // -Xconcgc 2559 } else if (match_option(option, "-Xconcgc")) { 2560 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) { 2561 return JNI_EINVAL; 2562 } 2563 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2564 // -Xnoconcgc 2565 } else if (match_option(option, "-Xnoconcgc")) { 2566 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) { 2567 return JNI_EINVAL; 2568 } 2569 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2570 // -Xbatch 2571 } else if (match_option(option, "-Xbatch")) { 2572 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2573 return JNI_EINVAL; 2574 } 2575 // -Xmn for compatibility with other JVM vendors 2576 } else if (match_option(option, "-Xmn", &tail)) { 2577 julong long_initial_young_size = 0; 2578 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2579 if (errcode != arg_in_range) { 2580 jio_fprintf(defaultStream::error_stream(), 2581 "Invalid initial young generation size: %s\n", option->optionString); 2582 describe_range_error(errcode); 2583 return JNI_EINVAL; 2584 } 2585 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2586 return JNI_EINVAL; 2587 } 2588 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2589 return JNI_EINVAL; 2590 } 2591 // -Xms 2592 } else if (match_option(option, "-Xms", &tail)) { 2593 julong size = 0; 2594 // an initial heap size of 0 means automatically determine 2595 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2596 if (errcode != arg_in_range) { 2597 jio_fprintf(defaultStream::error_stream(), 2598 "Invalid initial heap size: %s\n", option->optionString); 2599 describe_range_error(errcode); 2600 return JNI_EINVAL; 2601 } 2602 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2603 return JNI_EINVAL; 2604 } 2605 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2606 return JNI_EINVAL; 2607 } 2608 // -Xmx 2609 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2610 julong long_max_heap_size = 0; 2611 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2612 if (errcode != arg_in_range) { 2613 jio_fprintf(defaultStream::error_stream(), 2614 "Invalid maximum heap size: %s\n", option->optionString); 2615 describe_range_error(errcode); 2616 return JNI_EINVAL; 2617 } 2618 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2619 return JNI_EINVAL; 2620 } 2621 // Xmaxf 2622 } else if (match_option(option, "-Xmaxf", &tail)) { 2623 char* err; 2624 int maxf = (int)(strtod(tail, &err) * 100); 2625 if (*err != '\0' || *tail == '\0') { 2626 jio_fprintf(defaultStream::error_stream(), 2627 "Bad max heap free percentage size: %s\n", 2628 option->optionString); 2629 return JNI_EINVAL; 2630 } else { 2631 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2632 return JNI_EINVAL; 2633 } 2634 } 2635 // Xminf 2636 } else if (match_option(option, "-Xminf", &tail)) { 2637 char* err; 2638 int minf = (int)(strtod(tail, &err) * 100); 2639 if (*err != '\0' || *tail == '\0') { 2640 jio_fprintf(defaultStream::error_stream(), 2641 "Bad min heap free percentage size: %s\n", 2642 option->optionString); 2643 return JNI_EINVAL; 2644 } else { 2645 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2646 return JNI_EINVAL; 2647 } 2648 } 2649 // -Xss 2650 } else if (match_option(option, "-Xss", &tail)) { 2651 intx value = 0; 2652 jint err = parse_xss(option, tail, &value); 2653 if (err != JNI_OK) { 2654 return err; 2655 } 2656 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2657 return JNI_EINVAL; 2658 } 2659 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2660 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2661 julong long_ReservedCodeCacheSize = 0; 2662 2663 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2664 if (errcode != arg_in_range) { 2665 jio_fprintf(defaultStream::error_stream(), 2666 "Invalid maximum code cache size: %s.\n", option->optionString); 2667 return JNI_EINVAL; 2668 } 2669 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2670 return JNI_EINVAL; 2671 } 2672 // -green 2673 } else if (match_option(option, "-green")) { 2674 jio_fprintf(defaultStream::error_stream(), 2675 "Green threads support not available\n"); 2676 return JNI_EINVAL; 2677 // -native 2678 } else if (match_option(option, "-native")) { 2679 // HotSpot always uses native threads, ignore silently for compatibility 2680 // -Xrs 2681 } else if (match_option(option, "-Xrs")) { 2682 // Classic/EVM option, new functionality 2683 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2684 return JNI_EINVAL; 2685 } 2686 // -Xprof 2687 } else if (match_option(option, "-Xprof")) { 2688 char version[256]; 2689 // Obsolete in JDK 10 2690 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2691 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2692 // -Xinternalversion 2693 } else if (match_option(option, "-Xinternalversion")) { 2694 jio_fprintf(defaultStream::output_stream(), "%s\n", 2695 VM_Version::internal_vm_info_string()); 2696 vm_exit(0); 2697 #ifndef PRODUCT 2698 // -Xprintflags 2699 } else if (match_option(option, "-Xprintflags")) { 2700 JVMFlag::printFlags(tty, false); 2701 vm_exit(0); 2702 #endif 2703 // -D 2704 } else if (match_option(option, "-D", &tail)) { 2705 const char* value; 2706 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2707 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2708 // abort if -Djava.endorsed.dirs is set 2709 jio_fprintf(defaultStream::output_stream(), 2710 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2711 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2712 return JNI_EINVAL; 2713 } 2714 if (match_option(option, "-Djava.ext.dirs=", &value) && 2715 *value != '\0' && strcmp(value, "\"\"") != 0) { 2716 // abort if -Djava.ext.dirs is set 2717 jio_fprintf(defaultStream::output_stream(), 2718 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2719 return JNI_EINVAL; 2720 } 2721 // Check for module related properties. They must be set using the modules 2722 // options. For example: use "--add-modules=java.sql", not 2723 // "-Djdk.module.addmods=java.sql" 2724 if (is_internal_module_property(option->optionString + 2)) { 2725 needs_module_property_warning = true; 2726 continue; 2727 } 2728 2729 if (!add_property(tail)) { 2730 return JNI_ENOMEM; 2731 } 2732 // Out of the box management support 2733 if (match_option(option, "-Dcom.sun.management", &tail)) { 2734 #if INCLUDE_MANAGEMENT 2735 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2736 return JNI_EINVAL; 2737 } 2738 // management agent in module jdk.management.agent 2739 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2740 return JNI_ENOMEM; 2741 } 2742 #else 2743 jio_fprintf(defaultStream::output_stream(), 2744 "-Dcom.sun.management is not supported in this VM.\n"); 2745 return JNI_ERR; 2746 #endif 2747 } 2748 // -Xint 2749 } else if (match_option(option, "-Xint")) { 2750 set_mode_flags(_int); 2751 // -Xmixed 2752 } else if (match_option(option, "-Xmixed")) { 2753 set_mode_flags(_mixed); 2754 // -Xcomp 2755 } else if (match_option(option, "-Xcomp")) { 2756 // for testing the compiler; turn off all flags that inhibit compilation 2757 set_mode_flags(_comp); 2758 // -Xshare:dump 2759 } else if (match_option(option, "-Xshare:dump")) { 2760 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) { 2761 return JNI_EINVAL; 2762 } 2763 // -Xshare:on 2764 } else if (match_option(option, "-Xshare:on")) { 2765 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2766 return JNI_EINVAL; 2767 } 2768 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2769 return JNI_EINVAL; 2770 } 2771 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2772 } else if (match_option(option, "-Xshare:auto")) { 2773 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2774 return JNI_EINVAL; 2775 } 2776 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2777 return JNI_EINVAL; 2778 } 2779 // -Xshare:off 2780 } else if (match_option(option, "-Xshare:off")) { 2781 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) { 2782 return JNI_EINVAL; 2783 } 2784 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2785 return JNI_EINVAL; 2786 } 2787 // -Xverify 2788 } else if (match_option(option, "-Xverify", &tail)) { 2789 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2790 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2791 return JNI_EINVAL; 2792 } 2793 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2794 return JNI_EINVAL; 2795 } 2796 } else if (strcmp(tail, ":remote") == 0) { 2797 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2798 return JNI_EINVAL; 2799 } 2800 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2801 return JNI_EINVAL; 2802 } 2803 } else if (strcmp(tail, ":none") == 0) { 2804 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2805 return JNI_EINVAL; 2806 } 2807 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2808 return JNI_EINVAL; 2809 } 2810 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2811 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2812 return JNI_EINVAL; 2813 } 2814 // -Xdebug 2815 } else if (match_option(option, "-Xdebug")) { 2816 // note this flag has been used, then ignore 2817 set_xdebug_mode(true); 2818 // -Xnoagent 2819 } else if (match_option(option, "-Xnoagent")) { 2820 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2821 } else if (match_option(option, "-Xloggc:", &tail)) { 2822 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2823 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2824 _gc_log_filename = os::strdup_check_oom(tail); 2825 } else if (match_option(option, "-Xlog", &tail)) { 2826 bool ret = false; 2827 if (strcmp(tail, ":help") == 0) { 2828 fileStream stream(defaultStream::output_stream()); 2829 LogConfiguration::print_command_line_help(&stream); 2830 vm_exit(0); 2831 } else if (strcmp(tail, ":disable") == 0) { 2832 LogConfiguration::disable_logging(); 2833 ret = true; 2834 } else if (*tail == '\0') { 2835 ret = LogConfiguration::parse_command_line_arguments(); 2836 assert(ret, "-Xlog without arguments should never fail to parse"); 2837 } else if (*tail == ':') { 2838 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2839 } 2840 if (ret == false) { 2841 jio_fprintf(defaultStream::error_stream(), 2842 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2843 tail); 2844 return JNI_EINVAL; 2845 } 2846 // JNI hooks 2847 } else if (match_option(option, "-Xcheck", &tail)) { 2848 if (!strcmp(tail, ":jni")) { 2849 #if !INCLUDE_JNI_CHECK 2850 warning("JNI CHECKING is not supported in this VM"); 2851 #else 2852 CheckJNICalls = true; 2853 #endif // INCLUDE_JNI_CHECK 2854 } else if (is_bad_option(option, args->ignoreUnrecognized, 2855 "check")) { 2856 return JNI_EINVAL; 2857 } 2858 } else if (match_option(option, "vfprintf")) { 2859 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2860 } else if (match_option(option, "exit")) { 2861 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2862 } else if (match_option(option, "abort")) { 2863 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2864 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2865 // and the last option wins. 2866 } else if (match_option(option, "-XX:+NeverTenure")) { 2867 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2868 return JNI_EINVAL; 2869 } 2870 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2871 return JNI_EINVAL; 2872 } 2873 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2874 return JNI_EINVAL; 2875 } 2876 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2877 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2878 return JNI_EINVAL; 2879 } 2880 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2881 return JNI_EINVAL; 2882 } 2883 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2884 return JNI_EINVAL; 2885 } 2886 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2887 uintx max_tenuring_thresh = 0; 2888 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2889 jio_fprintf(defaultStream::error_stream(), 2890 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2891 return JNI_EINVAL; 2892 } 2893 2894 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2895 return JNI_EINVAL; 2896 } 2897 2898 if (MaxTenuringThreshold == 0) { 2899 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2900 return JNI_EINVAL; 2901 } 2902 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2903 return JNI_EINVAL; 2904 } 2905 } else { 2906 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2907 return JNI_EINVAL; 2908 } 2909 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2910 return JNI_EINVAL; 2911 } 2912 } 2913 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2914 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2915 return JNI_EINVAL; 2916 } 2917 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2918 return JNI_EINVAL; 2919 } 2920 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2921 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2922 return JNI_EINVAL; 2923 } 2924 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2925 return JNI_EINVAL; 2926 } 2927 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2928 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2929 return JNI_EINVAL; 2930 } 2931 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2932 return JNI_EINVAL; 2933 } 2934 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2935 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2936 return JNI_EINVAL; 2937 } 2938 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2939 return JNI_EINVAL; 2940 } 2941 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 2942 #if defined(DTRACE_ENABLED) 2943 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 2944 return JNI_EINVAL; 2945 } 2946 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 2947 return JNI_EINVAL; 2948 } 2949 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 2950 return JNI_EINVAL; 2951 } 2952 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 2953 return JNI_EINVAL; 2954 } 2955 #else // defined(DTRACE_ENABLED) 2956 jio_fprintf(defaultStream::error_stream(), 2957 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2958 return JNI_EINVAL; 2959 #endif // defined(DTRACE_ENABLED) 2960 #ifdef ASSERT 2961 } else if (match_option(option, "-XX:+FullGCALot")) { 2962 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2963 return JNI_EINVAL; 2964 } 2965 // disable scavenge before parallel mark-compact 2966 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2967 return JNI_EINVAL; 2968 } 2969 #endif 2970 #if !INCLUDE_MANAGEMENT 2971 } else if (match_option(option, "-XX:+ManagementServer")) { 2972 jio_fprintf(defaultStream::error_stream(), 2973 "ManagementServer is not supported in this VM.\n"); 2974 return JNI_ERR; 2975 #endif // INCLUDE_MANAGEMENT 2976 #if INCLUDE_JFR 2977 } else if (match_jfr_option(&option)) { 2978 return JNI_EINVAL; 2979 #endif 2980 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2981 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2982 // already been handled 2983 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2984 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2985 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2986 return JNI_EINVAL; 2987 } 2988 } 2989 // Unknown option 2990 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2991 return JNI_ERR; 2992 } 2993 } 2994 2995 // PrintSharedArchiveAndExit will turn on 2996 // -Xshare:on 2997 // -Xlog:class+path=info 2998 if (PrintSharedArchiveAndExit) { 2999 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 3000 return JNI_EINVAL; 3001 } 3002 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 3003 return JNI_EINVAL; 3004 } 3005 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3006 } 3007 3008 fix_appclasspath(); 3009 3010 return JNI_OK; 3011 } 3012 3013 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3014 // For java.base check for duplicate --patch-module options being specified on the command line. 3015 // This check is only required for java.base, all other duplicate module specifications 3016 // will be checked during module system initialization. The module system initialization 3017 // will throw an ExceptionInInitializerError if this situation occurs. 3018 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3019 if (*patch_mod_javabase) { 3020 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3021 } else { 3022 *patch_mod_javabase = true; 3023 } 3024 } 3025 3026 // Create GrowableArray lazily, only if --patch-module has been specified 3027 if (_patch_mod_prefix == NULL) { 3028 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3029 } 3030 3031 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3032 } 3033 3034 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3035 // 3036 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3037 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3038 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3039 // path is treated as the current directory. 3040 // 3041 // This causes problems with CDS, which requires that all directories specified in the classpath 3042 // must be empty. In most cases, applications do NOT want to load classes from the current 3043 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3044 // scripts compatible with CDS. 3045 void Arguments::fix_appclasspath() { 3046 if (IgnoreEmptyClassPaths) { 3047 const char separator = *os::path_separator(); 3048 const char* src = _java_class_path->value(); 3049 3050 // skip over all the leading empty paths 3051 while (*src == separator) { 3052 src ++; 3053 } 3054 3055 char* copy = os::strdup_check_oom(src, mtArguments); 3056 3057 // trim all trailing empty paths 3058 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3059 *tail = '\0'; 3060 } 3061 3062 char from[3] = {separator, separator, '\0'}; 3063 char to [2] = {separator, '\0'}; 3064 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3065 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3066 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3067 } 3068 3069 _java_class_path->set_writeable_value(copy); 3070 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3071 } 3072 } 3073 3074 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3075 // check if the default lib/endorsed directory exists; if so, error 3076 char path[JVM_MAXPATHLEN]; 3077 const char* fileSep = os::file_separator(); 3078 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3079 3080 DIR* dir = os::opendir(path); 3081 if (dir != NULL) { 3082 jio_fprintf(defaultStream::output_stream(), 3083 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3084 "in modular form will be supported via the concept of upgradeable modules.\n"); 3085 os::closedir(dir); 3086 return JNI_ERR; 3087 } 3088 3089 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3090 dir = os::opendir(path); 3091 if (dir != NULL) { 3092 jio_fprintf(defaultStream::output_stream(), 3093 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3094 "Use -classpath instead.\n."); 3095 os::closedir(dir); 3096 return JNI_ERR; 3097 } 3098 3099 // This must be done after all arguments have been processed 3100 // and the container support has been initialized since AggressiveHeap 3101 // relies on the amount of total memory available. 3102 if (AggressiveHeap) { 3103 jint result = set_aggressive_heap_flags(); 3104 if (result != JNI_OK) { 3105 return result; 3106 } 3107 } 3108 3109 // This must be done after all arguments have been processed. 3110 // java_compiler() true means set to "NONE" or empty. 3111 if (java_compiler() && !xdebug_mode()) { 3112 // For backwards compatibility, we switch to interpreted mode if 3113 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3114 // not specified. 3115 set_mode_flags(_int); 3116 } 3117 3118 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3119 // but like -Xint, leave compilation thresholds unaffected. 3120 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3121 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3122 set_mode_flags(_int); 3123 } 3124 3125 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3126 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3127 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3128 } 3129 3130 #if !COMPILER2_OR_JVMCI 3131 // Don't degrade server performance for footprint 3132 if (FLAG_IS_DEFAULT(UseLargePages) && 3133 MaxHeapSize < LargePageHeapSizeThreshold) { 3134 // No need for large granularity pages w/small heaps. 3135 // Note that large pages are enabled/disabled for both the 3136 // Java heap and the code cache. 3137 FLAG_SET_DEFAULT(UseLargePages, false); 3138 } 3139 3140 UNSUPPORTED_OPTION(ProfileInterpreter); 3141 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3142 #endif 3143 3144 #ifndef TIERED 3145 // Tiered compilation is undefined. 3146 UNSUPPORTED_OPTION(TieredCompilation); 3147 #endif 3148 3149 if (!check_vm_args_consistency()) { 3150 return JNI_ERR; 3151 } 3152 3153 #if INCLUDE_CDS 3154 if (DumpSharedSpaces) { 3155 // Disable biased locking now as it interferes with the clean up of 3156 // the archived Klasses and Java string objects (at dump time only). 3157 UseBiasedLocking = false; 3158 3159 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3160 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable 3161 // compiler just to be safe. 3162 // 3163 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata 3164 // instead of modifying them in place. The copy is inaccessible to the compiler. 3165 // TODO: revisit the following for the static archive case. 3166 set_mode_flags(_int); 3167 } 3168 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) { 3169 // Always verify non-system classes during CDS dump 3170 if (!BytecodeVerificationRemote) { 3171 BytecodeVerificationRemote = true; 3172 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3173 } 3174 } 3175 if (ArchiveClassesAtExit == NULL) { 3176 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false); 3177 } 3178 if (UseSharedSpaces && patch_mod_javabase) { 3179 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3180 } 3181 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3182 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3183 } 3184 #endif 3185 3186 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3187 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3188 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3189 3190 return JNI_OK; 3191 } 3192 3193 // Helper class for controlling the lifetime of JavaVMInitArgs 3194 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3195 // deleted on the destruction of the ScopedVMInitArgs object. 3196 class ScopedVMInitArgs : public StackObj { 3197 private: 3198 JavaVMInitArgs _args; 3199 char* _container_name; 3200 bool _is_set; 3201 char* _vm_options_file_arg; 3202 3203 public: 3204 ScopedVMInitArgs(const char *container_name) { 3205 _args.version = JNI_VERSION_1_2; 3206 _args.nOptions = 0; 3207 _args.options = NULL; 3208 _args.ignoreUnrecognized = false; 3209 _container_name = (char *)container_name; 3210 _is_set = false; 3211 _vm_options_file_arg = NULL; 3212 } 3213 3214 // Populates the JavaVMInitArgs object represented by this 3215 // ScopedVMInitArgs object with the arguments in options. The 3216 // allocated memory is deleted by the destructor. If this method 3217 // returns anything other than JNI_OK, then this object is in a 3218 // partially constructed state, and should be abandoned. 3219 jint set_args(GrowableArray<JavaVMOption>* options) { 3220 _is_set = true; 3221 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3222 JavaVMOption, options->length(), mtArguments); 3223 if (options_arr == NULL) { 3224 return JNI_ENOMEM; 3225 } 3226 _args.options = options_arr; 3227 3228 for (int i = 0; i < options->length(); i++) { 3229 options_arr[i] = options->at(i); 3230 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3231 if (options_arr[i].optionString == NULL) { 3232 // Rely on the destructor to do cleanup. 3233 _args.nOptions = i; 3234 return JNI_ENOMEM; 3235 } 3236 } 3237 3238 _args.nOptions = options->length(); 3239 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3240 return JNI_OK; 3241 } 3242 3243 JavaVMInitArgs* get() { return &_args; } 3244 char* container_name() { return _container_name; } 3245 bool is_set() { return _is_set; } 3246 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3247 char* vm_options_file_arg() { return _vm_options_file_arg; } 3248 3249 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3250 if (_vm_options_file_arg != NULL) { 3251 os::free(_vm_options_file_arg); 3252 } 3253 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3254 } 3255 3256 ~ScopedVMInitArgs() { 3257 if (_vm_options_file_arg != NULL) { 3258 os::free(_vm_options_file_arg); 3259 } 3260 if (_args.options == NULL) return; 3261 for (int i = 0; i < _args.nOptions; i++) { 3262 os::free(_args.options[i].optionString); 3263 } 3264 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3265 } 3266 3267 // Insert options into this option list, to replace option at 3268 // vm_options_file_pos (-XX:VMOptionsFile) 3269 jint insert(const JavaVMInitArgs* args, 3270 const JavaVMInitArgs* args_to_insert, 3271 const int vm_options_file_pos) { 3272 assert(_args.options == NULL, "shouldn't be set yet"); 3273 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3274 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3275 3276 int length = args->nOptions + args_to_insert->nOptions - 1; 3277 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3278 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3279 for (int i = 0; i < args->nOptions; i++) { 3280 if (i == vm_options_file_pos) { 3281 // insert the new options starting at the same place as the 3282 // -XX:VMOptionsFile option 3283 for (int j = 0; j < args_to_insert->nOptions; j++) { 3284 options->push(args_to_insert->options[j]); 3285 } 3286 } else { 3287 options->push(args->options[i]); 3288 } 3289 } 3290 // make into options array 3291 jint result = set_args(options); 3292 delete options; 3293 return result; 3294 } 3295 }; 3296 3297 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3298 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3299 } 3300 3301 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3302 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3303 } 3304 3305 jint Arguments::parse_options_environment_variable(const char* name, 3306 ScopedVMInitArgs* vm_args) { 3307 char *buffer = ::getenv(name); 3308 3309 // Don't check this environment variable if user has special privileges 3310 // (e.g. unix su command). 3311 if (buffer == NULL || os::have_special_privileges()) { 3312 return JNI_OK; 3313 } 3314 3315 if ((buffer = os::strdup(buffer)) == NULL) { 3316 return JNI_ENOMEM; 3317 } 3318 3319 jio_fprintf(defaultStream::error_stream(), 3320 "Picked up %s: %s\n", name, buffer); 3321 3322 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3323 3324 os::free(buffer); 3325 return retcode; 3326 } 3327 3328 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3329 // read file into buffer 3330 int fd = ::open(file_name, O_RDONLY); 3331 if (fd < 0) { 3332 jio_fprintf(defaultStream::error_stream(), 3333 "Could not open options file '%s'\n", 3334 file_name); 3335 return JNI_ERR; 3336 } 3337 3338 struct stat stbuf; 3339 int retcode = os::stat(file_name, &stbuf); 3340 if (retcode != 0) { 3341 jio_fprintf(defaultStream::error_stream(), 3342 "Could not stat options file '%s'\n", 3343 file_name); 3344 os::close(fd); 3345 return JNI_ERR; 3346 } 3347 3348 if (stbuf.st_size == 0) { 3349 // tell caller there is no option data and that is ok 3350 os::close(fd); 3351 return JNI_OK; 3352 } 3353 3354 // '+ 1' for NULL termination even with max bytes 3355 size_t bytes_alloc = stbuf.st_size + 1; 3356 3357 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3358 if (NULL == buf) { 3359 jio_fprintf(defaultStream::error_stream(), 3360 "Could not allocate read buffer for options file parse\n"); 3361 os::close(fd); 3362 return JNI_ENOMEM; 3363 } 3364 3365 memset(buf, 0, bytes_alloc); 3366 3367 // Fill buffer 3368 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc); 3369 os::close(fd); 3370 if (bytes_read < 0) { 3371 FREE_C_HEAP_ARRAY(char, buf); 3372 jio_fprintf(defaultStream::error_stream(), 3373 "Could not read options file '%s'\n", file_name); 3374 return JNI_ERR; 3375 } 3376 3377 if (bytes_read == 0) { 3378 // tell caller there is no option data and that is ok 3379 FREE_C_HEAP_ARRAY(char, buf); 3380 return JNI_OK; 3381 } 3382 3383 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3384 3385 FREE_C_HEAP_ARRAY(char, buf); 3386 return retcode; 3387 } 3388 3389 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3390 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3391 3392 // some pointers to help with parsing 3393 char *buffer_end = buffer + buf_len; 3394 char *opt_hd = buffer; 3395 char *wrt = buffer; 3396 char *rd = buffer; 3397 3398 // parse all options 3399 while (rd < buffer_end) { 3400 // skip leading white space from the input string 3401 while (rd < buffer_end && isspace(*rd)) { 3402 rd++; 3403 } 3404 3405 if (rd >= buffer_end) { 3406 break; 3407 } 3408 3409 // Remember this is where we found the head of the token. 3410 opt_hd = wrt; 3411 3412 // Tokens are strings of non white space characters separated 3413 // by one or more white spaces. 3414 while (rd < buffer_end && !isspace(*rd)) { 3415 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3416 int quote = *rd; // matching quote to look for 3417 rd++; // don't copy open quote 3418 while (rd < buffer_end && *rd != quote) { 3419 // include everything (even spaces) 3420 // up until the close quote 3421 *wrt++ = *rd++; // copy to option string 3422 } 3423 3424 if (rd < buffer_end) { 3425 rd++; // don't copy close quote 3426 } else { 3427 // did not see closing quote 3428 jio_fprintf(defaultStream::error_stream(), 3429 "Unmatched quote in %s\n", name); 3430 delete options; 3431 return JNI_ERR; 3432 } 3433 } else { 3434 *wrt++ = *rd++; // copy to option string 3435 } 3436 } 3437 3438 // steal a white space character and set it to NULL 3439 *wrt++ = '\0'; 3440 // We now have a complete token 3441 3442 JavaVMOption option; 3443 option.optionString = opt_hd; 3444 option.extraInfo = NULL; 3445 3446 options->append(option); // Fill in option 3447 3448 rd++; // Advance to next character 3449 } 3450 3451 // Fill out JavaVMInitArgs structure. 3452 jint status = vm_args->set_args(options); 3453 3454 delete options; 3455 return status; 3456 } 3457 3458 void Arguments::set_shared_spaces_flags() { 3459 if (DumpSharedSpaces) { 3460 if (RequireSharedSpaces) { 3461 warning("Cannot dump shared archive while using shared archive"); 3462 } 3463 UseSharedSpaces = false; 3464 #ifdef _LP64 3465 if (!UseCompressedOops || !UseCompressedClassPointers) { 3466 vm_exit_during_initialization( 3467 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3468 } 3469 } else { 3470 if (!UseCompressedOops || !UseCompressedClassPointers) { 3471 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3472 } 3473 #endif 3474 } 3475 } 3476 3477 #if INCLUDE_CDS 3478 // Sharing support 3479 // Construct the path to the archive 3480 char* Arguments::get_default_shared_archive_path() { 3481 char *default_archive_path; 3482 char jvm_path[JVM_MAXPATHLEN]; 3483 os::jvm_path(jvm_path, sizeof(jvm_path)); 3484 char *end = strrchr(jvm_path, *os::file_separator()); 3485 if (end != NULL) *end = '\0'; 3486 size_t jvm_path_len = strlen(jvm_path); 3487 size_t file_sep_len = strlen(os::file_separator()); 3488 const size_t len = jvm_path_len + file_sep_len + 20; 3489 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3490 if (default_archive_path != NULL) { 3491 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa", 3492 jvm_path, os::file_separator()); 3493 } 3494 return default_archive_path; 3495 } 3496 3497 int Arguments::num_archives(const char* archive_path) { 3498 if (archive_path == NULL) { 3499 return 0; 3500 } 3501 int npaths = 1; 3502 char* p = (char*)archive_path; 3503 while (*p != '\0') { 3504 if (*p == os::path_separator()[0]) { 3505 npaths++; 3506 } 3507 p++; 3508 } 3509 return npaths; 3510 } 3511 3512 void Arguments::extract_shared_archive_paths(const char* archive_path, 3513 char** base_archive_path, 3514 char** top_archive_path) { 3515 char* begin_ptr = (char*)archive_path; 3516 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3517 if (end_ptr == NULL || end_ptr == begin_ptr) { 3518 vm_exit_during_initialization("Base archive was not specified", archive_path); 3519 } 3520 size_t len = end_ptr - begin_ptr; 3521 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3522 strncpy(cur_path, begin_ptr, len); 3523 cur_path[len] = '\0'; 3524 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/); 3525 *base_archive_path = cur_path; 3526 3527 begin_ptr = ++end_ptr; 3528 if (*begin_ptr == '\0') { 3529 vm_exit_during_initialization("Top archive was not specified", archive_path); 3530 } 3531 end_ptr = strchr(begin_ptr, '\0'); 3532 assert(end_ptr != NULL, "sanity"); 3533 len = end_ptr - begin_ptr; 3534 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3535 strncpy(cur_path, begin_ptr, len + 1); 3536 //cur_path[len] = '\0'; 3537 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/); 3538 *top_archive_path = cur_path; 3539 } 3540 3541 bool Arguments::init_shared_archive_paths() { 3542 if (ArchiveClassesAtExit != NULL) { 3543 if (DumpSharedSpaces) { 3544 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3545 } 3546 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) { 3547 return false; 3548 } 3549 check_unsupported_dumping_properties(); 3550 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments); 3551 } 3552 if (SharedArchiveFile == NULL) { 3553 SharedArchivePath = get_default_shared_archive_path(); 3554 } else { 3555 int archives = num_archives(SharedArchiveFile); 3556 if (DynamicDumpSharedSpaces || DumpSharedSpaces) { 3557 if (archives > 1) { 3558 vm_exit_during_initialization( 3559 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3560 } 3561 if (DynamicDumpSharedSpaces) { 3562 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3563 vm_exit_during_initialization( 3564 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3565 SharedArchiveFile); 3566 } 3567 } 3568 } 3569 if (!DynamicDumpSharedSpaces && !DumpSharedSpaces){ 3570 if (archives > 2) { 3571 vm_exit_during_initialization( 3572 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3573 } 3574 if (archives == 1) { 3575 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3576 int name_size; 3577 bool success = 3578 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath); 3579 if (!success) { 3580 SharedArchivePath = temp_archive_path; 3581 } else { 3582 SharedDynamicArchivePath = temp_archive_path; 3583 } 3584 } else { 3585 extract_shared_archive_paths((const char*)SharedArchiveFile, 3586 &SharedArchivePath, &SharedDynamicArchivePath); 3587 } 3588 } else { // CDS dumping 3589 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3590 } 3591 } 3592 return (SharedArchivePath != NULL); 3593 } 3594 #endif // INCLUDE_CDS 3595 3596 #ifndef PRODUCT 3597 // Determine whether LogVMOutput should be implicitly turned on. 3598 static bool use_vm_log() { 3599 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3600 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3601 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3602 PrintAssembly || TraceDeoptimization || TraceDependencies || 3603 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3604 return true; 3605 } 3606 3607 #ifdef COMPILER1 3608 if (PrintC1Statistics) { 3609 return true; 3610 } 3611 #endif // COMPILER1 3612 3613 #ifdef COMPILER2 3614 if (PrintOptoAssembly || PrintOptoStatistics) { 3615 return true; 3616 } 3617 #endif // COMPILER2 3618 3619 return false; 3620 } 3621 3622 #endif // PRODUCT 3623 3624 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3625 for (int index = 0; index < args->nOptions; index++) { 3626 const JavaVMOption* option = args->options + index; 3627 const char* tail; 3628 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3629 return true; 3630 } 3631 } 3632 return false; 3633 } 3634 3635 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3636 const char* vm_options_file, 3637 const int vm_options_file_pos, 3638 ScopedVMInitArgs* vm_options_file_args, 3639 ScopedVMInitArgs* args_out) { 3640 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3641 if (code != JNI_OK) { 3642 return code; 3643 } 3644 3645 if (vm_options_file_args->get()->nOptions < 1) { 3646 return JNI_OK; 3647 } 3648 3649 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3650 jio_fprintf(defaultStream::error_stream(), 3651 "A VM options file may not refer to a VM options file. " 3652 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3653 "options file '%s' in options container '%s' is an error.\n", 3654 vm_options_file_args->vm_options_file_arg(), 3655 vm_options_file_args->container_name()); 3656 return JNI_EINVAL; 3657 } 3658 3659 return args_out->insert(args, vm_options_file_args->get(), 3660 vm_options_file_pos); 3661 } 3662 3663 // Expand -XX:VMOptionsFile found in args_in as needed. 3664 // mod_args and args_out parameters may return values as needed. 3665 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3666 ScopedVMInitArgs* mod_args, 3667 JavaVMInitArgs** args_out) { 3668 jint code = match_special_option_and_act(args_in, mod_args); 3669 if (code != JNI_OK) { 3670 return code; 3671 } 3672 3673 if (mod_args->is_set()) { 3674 // args_in contains -XX:VMOptionsFile and mod_args contains the 3675 // original options from args_in along with the options expanded 3676 // from the VMOptionsFile. Return a short-hand to the caller. 3677 *args_out = mod_args->get(); 3678 } else { 3679 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3680 } 3681 return JNI_OK; 3682 } 3683 3684 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3685 ScopedVMInitArgs* args_out) { 3686 // Remaining part of option string 3687 const char* tail; 3688 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3689 3690 for (int index = 0; index < args->nOptions; index++) { 3691 const JavaVMOption* option = args->options + index; 3692 if (match_option(option, "-XX:Flags=", &tail)) { 3693 Arguments::set_jvm_flags_file(tail); 3694 continue; 3695 } 3696 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3697 if (vm_options_file_args.found_vm_options_file_arg()) { 3698 jio_fprintf(defaultStream::error_stream(), 3699 "The option '%s' is already specified in the options " 3700 "container '%s' so the specification of '%s' in the " 3701 "same options container is an error.\n", 3702 vm_options_file_args.vm_options_file_arg(), 3703 vm_options_file_args.container_name(), 3704 option->optionString); 3705 return JNI_EINVAL; 3706 } 3707 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3708 // If there's a VMOptionsFile, parse that 3709 jint code = insert_vm_options_file(args, tail, index, 3710 &vm_options_file_args, args_out); 3711 if (code != JNI_OK) { 3712 return code; 3713 } 3714 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3715 if (args_out->is_set()) { 3716 // The VMOptions file inserted some options so switch 'args' 3717 // to the new set of options, and continue processing which 3718 // preserves "last option wins" semantics. 3719 args = args_out->get(); 3720 // The first option from the VMOptionsFile replaces the 3721 // current option. So we back track to process the 3722 // replacement option. 3723 index--; 3724 } 3725 continue; 3726 } 3727 if (match_option(option, "-XX:+PrintVMOptions")) { 3728 PrintVMOptions = true; 3729 continue; 3730 } 3731 if (match_option(option, "-XX:-PrintVMOptions")) { 3732 PrintVMOptions = false; 3733 continue; 3734 } 3735 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3736 IgnoreUnrecognizedVMOptions = true; 3737 continue; 3738 } 3739 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3740 IgnoreUnrecognizedVMOptions = false; 3741 continue; 3742 } 3743 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3744 JVMFlag::printFlags(tty, false); 3745 vm_exit(0); 3746 } 3747 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3748 #if INCLUDE_NMT 3749 // The launcher did not setup nmt environment variable properly. 3750 if (!MemTracker::check_launcher_nmt_support(tail)) { 3751 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3752 } 3753 3754 // Verify if nmt option is valid. 3755 if (MemTracker::verify_nmt_option()) { 3756 // Late initialization, still in single-threaded mode. 3757 if (MemTracker::tracking_level() >= NMT_summary) { 3758 MemTracker::init(); 3759 } 3760 } else { 3761 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3762 } 3763 continue; 3764 #else 3765 jio_fprintf(defaultStream::error_stream(), 3766 "Native Memory Tracking is not supported in this VM\n"); 3767 return JNI_ERR; 3768 #endif 3769 } 3770 3771 #ifndef PRODUCT 3772 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3773 JVMFlag::printFlags(tty, true); 3774 vm_exit(0); 3775 } 3776 #endif 3777 } 3778 return JNI_OK; 3779 } 3780 3781 static void print_options(const JavaVMInitArgs *args) { 3782 const char* tail; 3783 for (int index = 0; index < args->nOptions; index++) { 3784 const JavaVMOption *option = args->options + index; 3785 if (match_option(option, "-XX:", &tail)) { 3786 logOption(tail); 3787 } 3788 } 3789 } 3790 3791 bool Arguments::handle_deprecated_print_gc_flags() { 3792 if (PrintGC) { 3793 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3794 } 3795 if (PrintGCDetails) { 3796 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3797 } 3798 3799 if (_gc_log_filename != NULL) { 3800 // -Xloggc was used to specify a filename 3801 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3802 3803 LogTarget(Error, logging) target; 3804 LogStream errstream(target); 3805 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 3806 } else if (PrintGC || PrintGCDetails) { 3807 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3808 } 3809 return true; 3810 } 3811 3812 void Arguments::handle_extra_cms_flags(const char* msg) { 3813 SpecialFlag flag; 3814 const char *flag_name = "UseConcMarkSweepGC"; 3815 if (lookup_special_flag(flag_name, flag)) { 3816 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 3817 warning("%s", msg); 3818 } 3819 } 3820 3821 // Parse entry point called from JNI_CreateJavaVM 3822 3823 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3824 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 3825 3826 // Initialize ranges, constraints and writeables 3827 JVMFlagRangeList::init(); 3828 JVMFlagConstraintList::init(); 3829 JVMFlagWriteableList::init(); 3830 3831 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3832 const char* hotspotrc = ".hotspotrc"; 3833 bool settings_file_specified = false; 3834 bool needs_hotspotrc_warning = false; 3835 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3836 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3837 3838 // Pointers to current working set of containers 3839 JavaVMInitArgs* cur_cmd_args; 3840 JavaVMInitArgs* cur_java_options_args; 3841 JavaVMInitArgs* cur_java_tool_options_args; 3842 3843 // Containers for modified/expanded options 3844 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3845 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3846 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3847 3848 3849 jint code = 3850 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3851 if (code != JNI_OK) { 3852 return code; 3853 } 3854 3855 code = parse_java_options_environment_variable(&initial_java_options_args); 3856 if (code != JNI_OK) { 3857 return code; 3858 } 3859 3860 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3861 &mod_java_tool_options_args, 3862 &cur_java_tool_options_args); 3863 if (code != JNI_OK) { 3864 return code; 3865 } 3866 3867 code = expand_vm_options_as_needed(initial_cmd_args, 3868 &mod_cmd_args, 3869 &cur_cmd_args); 3870 if (code != JNI_OK) { 3871 return code; 3872 } 3873 3874 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3875 &mod_java_options_args, 3876 &cur_java_options_args); 3877 if (code != JNI_OK) { 3878 return code; 3879 } 3880 3881 const char* flags_file = Arguments::get_jvm_flags_file(); 3882 settings_file_specified = (flags_file != NULL); 3883 3884 if (IgnoreUnrecognizedVMOptions) { 3885 cur_cmd_args->ignoreUnrecognized = true; 3886 cur_java_tool_options_args->ignoreUnrecognized = true; 3887 cur_java_options_args->ignoreUnrecognized = true; 3888 } 3889 3890 // Parse specified settings file 3891 if (settings_file_specified) { 3892 if (!process_settings_file(flags_file, true, 3893 cur_cmd_args->ignoreUnrecognized)) { 3894 return JNI_EINVAL; 3895 } 3896 } else { 3897 #ifdef ASSERT 3898 // Parse default .hotspotrc settings file 3899 if (!process_settings_file(".hotspotrc", false, 3900 cur_cmd_args->ignoreUnrecognized)) { 3901 return JNI_EINVAL; 3902 } 3903 #else 3904 struct stat buf; 3905 if (os::stat(hotspotrc, &buf) == 0) { 3906 needs_hotspotrc_warning = true; 3907 } 3908 #endif 3909 } 3910 3911 if (PrintVMOptions) { 3912 print_options(cur_java_tool_options_args); 3913 print_options(cur_cmd_args); 3914 print_options(cur_java_options_args); 3915 } 3916 3917 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3918 jint result = parse_vm_init_args(cur_java_tool_options_args, 3919 cur_java_options_args, 3920 cur_cmd_args); 3921 3922 if (result != JNI_OK) { 3923 return result; 3924 } 3925 3926 #if INCLUDE_CDS 3927 // Initialize shared archive paths which could include both base and dynamic archive paths 3928 if (!init_shared_archive_paths()) { 3929 return JNI_ENOMEM; 3930 } 3931 #endif 3932 3933 // Delay warning until here so that we've had a chance to process 3934 // the -XX:-PrintWarnings flag 3935 if (needs_hotspotrc_warning) { 3936 warning("%s file is present but has been ignored. " 3937 "Run with -XX:Flags=%s to load the file.", 3938 hotspotrc, hotspotrc); 3939 } 3940 3941 if (needs_module_property_warning) { 3942 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3943 " names that are reserved for internal use."); 3944 } 3945 3946 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3947 UNSUPPORTED_OPTION(UseLargePages); 3948 #endif 3949 3950 #if defined(AIX) 3951 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3952 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt); 3953 #endif 3954 3955 #ifndef PRODUCT 3956 if (TraceBytecodesAt != 0) { 3957 TraceBytecodes = true; 3958 } 3959 if (CountCompiledCalls) { 3960 if (UseCounterDecay) { 3961 warning("UseCounterDecay disabled because CountCalls is set"); 3962 UseCounterDecay = false; 3963 } 3964 } 3965 #endif // PRODUCT 3966 3967 if (ScavengeRootsInCode == 0) { 3968 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3969 warning("Forcing ScavengeRootsInCode non-zero"); 3970 } 3971 ScavengeRootsInCode = 1; 3972 } 3973 3974 if (!handle_deprecated_print_gc_flags()) { 3975 return JNI_EINVAL; 3976 } 3977 3978 // Set object alignment values. 3979 set_object_alignment(); 3980 3981 #if !INCLUDE_CDS 3982 if (DumpSharedSpaces || RequireSharedSpaces) { 3983 jio_fprintf(defaultStream::error_stream(), 3984 "Shared spaces are not supported in this VM\n"); 3985 return JNI_ERR; 3986 } 3987 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 3988 log_is_enabled(Info, cds)) { 3989 warning("Shared spaces are not supported in this VM"); 3990 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3991 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3992 } 3993 no_shared_spaces("CDS Disabled"); 3994 #endif // INCLUDE_CDS 3995 3996 return JNI_OK; 3997 } 3998 3999 jint Arguments::apply_ergo() { 4000 // Set flags based on ergonomics. 4001 jint result = set_ergonomics_flags(); 4002 if (result != JNI_OK) return result; 4003 4004 // Set heap size based on available physical memory 4005 set_heap_size(); 4006 4007 GCConfig::arguments()->initialize(); 4008 4009 set_shared_spaces_flags(); 4010 4011 // Initialize Metaspace flags and alignments 4012 Metaspace::ergo_initialize(); 4013 4014 // Set compiler flags after GC is selected and GC specific 4015 // flags (LoopStripMiningIter) are set. 4016 CompilerConfig::ergo_initialize(); 4017 4018 // Set bytecode rewriting flags 4019 set_bytecode_flags(); 4020 4021 // Set flags if aggressive optimization flags are enabled 4022 jint code = set_aggressive_opts_flags(); 4023 if (code != JNI_OK) { 4024 return code; 4025 } 4026 4027 // Turn off biased locking for locking debug mode flags, 4028 // which are subtly different from each other but neither works with 4029 // biased locking 4030 if (UseHeavyMonitors 4031 #ifdef COMPILER1 4032 || !UseFastLocking 4033 #endif // COMPILER1 4034 #if INCLUDE_JVMCI 4035 || !JVMCIUseFastLocking 4036 #endif 4037 ) { 4038 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4039 // flag set to true on command line; warn the user that they 4040 // can't enable biased locking here 4041 warning("Biased Locking is not supported with locking debug flags" 4042 "; ignoring UseBiasedLocking flag." ); 4043 } 4044 UseBiasedLocking = false; 4045 } 4046 4047 #ifdef CC_INTERP 4048 // Clear flags not supported on zero. 4049 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4050 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4051 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4052 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4053 #endif // CC_INTERP 4054 4055 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4056 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4057 DebugNonSafepoints = true; 4058 } 4059 4060 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4061 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4062 } 4063 4064 // Treat the odd case where local verification is enabled but remote 4065 // verification is not as if both were enabled. 4066 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4067 log_info(verification)("Turning on remote verification because local verification is on"); 4068 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4069 } 4070 4071 #ifndef PRODUCT 4072 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4073 if (use_vm_log()) { 4074 LogVMOutput = true; 4075 } 4076 } 4077 #endif // PRODUCT 4078 4079 if (PrintCommandLineFlags) { 4080 JVMFlag::printSetFlags(tty); 4081 } 4082 4083 // Apply CPU specific policy for the BiasedLocking 4084 if (UseBiasedLocking) { 4085 if (!VM_Version::use_biased_locking() && 4086 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4087 UseBiasedLocking = false; 4088 } 4089 } 4090 #ifdef COMPILER2 4091 if (!UseBiasedLocking) { 4092 UseOptoBiasInlining = false; 4093 } 4094 #endif 4095 4096 #if defined(IA32) 4097 // Only server compiler can optimize safepoints well enough. 4098 if (!is_server_compilation_mode_vm()) { 4099 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false); 4100 } 4101 #endif 4102 4103 // ThreadLocalHandshakesConstraintFunc handles the constraints. 4104 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 4105 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4106 } else { 4107 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4108 } 4109 4110 return JNI_OK; 4111 } 4112 4113 jint Arguments::adjust_after_os() { 4114 if (UseNUMA) { 4115 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 4116 FLAG_SET_ERGO(UseNUMA, false); 4117 } else if (UseParallelGC || UseParallelOldGC) { 4118 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4119 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4120 } 4121 } 4122 // UseNUMAInterleaving is set to ON for all collectors and 4123 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4124 // such as the parallel collector for Linux and Solaris will 4125 // interleave old gen and survivor spaces on top of NUMA 4126 // allocation policy for the eden space. 4127 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4128 // all platforms and ParallelGC on Windows will interleave all 4129 // of the heap spaces across NUMA nodes. 4130 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4131 FLAG_SET_ERGO(UseNUMAInterleaving, true); 4132 } 4133 } 4134 return JNI_OK; 4135 } 4136 4137 int Arguments::PropertyList_count(SystemProperty* pl) { 4138 int count = 0; 4139 while(pl != NULL) { 4140 count++; 4141 pl = pl->next(); 4142 } 4143 return count; 4144 } 4145 4146 // Return the number of readable properties. 4147 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4148 int count = 0; 4149 while(pl != NULL) { 4150 if (pl->is_readable()) { 4151 count++; 4152 } 4153 pl = pl->next(); 4154 } 4155 return count; 4156 } 4157 4158 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4159 assert(key != NULL, "just checking"); 4160 SystemProperty* prop; 4161 for (prop = pl; prop != NULL; prop = prop->next()) { 4162 if (strcmp(key, prop->key()) == 0) return prop->value(); 4163 } 4164 return NULL; 4165 } 4166 4167 // Return the value of the requested property provided that it is a readable property. 4168 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4169 assert(key != NULL, "just checking"); 4170 SystemProperty* prop; 4171 // Return the property value if the keys match and the property is not internal or 4172 // it's the special internal property "jdk.boot.class.path.append". 4173 for (prop = pl; prop != NULL; prop = prop->next()) { 4174 if (strcmp(key, prop->key()) == 0) { 4175 if (!prop->internal()) { 4176 return prop->value(); 4177 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4178 return prop->value(); 4179 } else { 4180 // Property is internal and not jdk.boot.class.path.append so return NULL. 4181 return NULL; 4182 } 4183 } 4184 } 4185 return NULL; 4186 } 4187 4188 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4189 int count = 0; 4190 const char* ret_val = NULL; 4191 4192 while(pl != NULL) { 4193 if(count >= index) { 4194 ret_val = pl->key(); 4195 break; 4196 } 4197 count++; 4198 pl = pl->next(); 4199 } 4200 4201 return ret_val; 4202 } 4203 4204 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4205 int count = 0; 4206 char* ret_val = NULL; 4207 4208 while(pl != NULL) { 4209 if(count >= index) { 4210 ret_val = pl->value(); 4211 break; 4212 } 4213 count++; 4214 pl = pl->next(); 4215 } 4216 4217 return ret_val; 4218 } 4219 4220 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4221 SystemProperty* p = *plist; 4222 if (p == NULL) { 4223 *plist = new_p; 4224 } else { 4225 while (p->next() != NULL) { 4226 p = p->next(); 4227 } 4228 p->set_next(new_p); 4229 } 4230 } 4231 4232 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4233 bool writeable, bool internal) { 4234 if (plist == NULL) 4235 return; 4236 4237 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4238 PropertyList_add(plist, new_p); 4239 } 4240 4241 void Arguments::PropertyList_add(SystemProperty *element) { 4242 PropertyList_add(&_system_properties, element); 4243 } 4244 4245 // This add maintains unique property key in the list. 4246 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4247 PropertyAppendable append, PropertyWriteable writeable, 4248 PropertyInternal internal) { 4249 if (plist == NULL) 4250 return; 4251 4252 // If property key exist then update with new value. 4253 SystemProperty* prop; 4254 for (prop = *plist; prop != NULL; prop = prop->next()) { 4255 if (strcmp(k, prop->key()) == 0) { 4256 if (append == AppendProperty) { 4257 prop->append_value(v); 4258 } else { 4259 prop->set_value(v); 4260 } 4261 return; 4262 } 4263 } 4264 4265 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4266 } 4267 4268 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4269 // Returns true if all of the source pointed by src has been copied over to 4270 // the destination buffer pointed by buf. Otherwise, returns false. 4271 // Notes: 4272 // 1. If the length (buflen) of the destination buffer excluding the 4273 // NULL terminator character is not long enough for holding the expanded 4274 // pid characters, it also returns false instead of returning the partially 4275 // expanded one. 4276 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4277 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4278 char* buf, size_t buflen) { 4279 const char* p = src; 4280 char* b = buf; 4281 const char* src_end = &src[srclen]; 4282 char* buf_end = &buf[buflen - 1]; 4283 4284 while (p < src_end && b < buf_end) { 4285 if (*p == '%') { 4286 switch (*(++p)) { 4287 case '%': // "%%" ==> "%" 4288 *b++ = *p++; 4289 break; 4290 case 'p': { // "%p" ==> current process id 4291 // buf_end points to the character before the last character so 4292 // that we could write '\0' to the end of the buffer. 4293 size_t buf_sz = buf_end - b + 1; 4294 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4295 4296 // if jio_snprintf fails or the buffer is not long enough to hold 4297 // the expanded pid, returns false. 4298 if (ret < 0 || ret >= (int)buf_sz) { 4299 return false; 4300 } else { 4301 b += ret; 4302 assert(*b == '\0', "fail in copy_expand_pid"); 4303 if (p == src_end && b == buf_end + 1) { 4304 // reach the end of the buffer. 4305 return true; 4306 } 4307 } 4308 p++; 4309 break; 4310 } 4311 default : 4312 *b++ = '%'; 4313 } 4314 } else { 4315 *b++ = *p++; 4316 } 4317 } 4318 *b = '\0'; 4319 return (p == src_end); // return false if not all of the source was copied 4320 }