1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/javaAssertions.hpp" 29 #include "classfile/moduleEntry.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "gc/shared/gcArguments.hpp" 33 #include "gc/shared/gcConfig.hpp" 34 #include "logging/log.hpp" 35 #include "logging/logConfiguration.hpp" 36 #include "logging/logStream.hpp" 37 #include "logging/logTag.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/filemap.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "prims/jvmtiExport.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/flags/jvmFlag.hpp" 44 #include "runtime/flags/jvmFlagConstraintList.hpp" 45 #include "runtime/flags/jvmFlagWriteableList.hpp" 46 #include "runtime/flags/jvmFlagRangeList.hpp" 47 #include "runtime/globals_extension.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/os.inline.hpp" 50 #include "runtime/safepoint.hpp" 51 #include "runtime/safepointMechanism.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/align.hpp" 56 #include "utilities/defaultStream.hpp" 57 #include "utilities/macros.hpp" 58 #include "utilities/stringUtils.hpp" 59 #if INCLUDE_JFR 60 #include "jfr/jfr.hpp" 61 #endif 62 63 // Note: This is a special bug reporting site for the JVM 64 #ifdef VENDOR_URL_VM_BUG 65 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG 66 #else 67 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 68 #endif 69 #define DEFAULT_JAVA_LAUNCHER "generic" 70 71 char* Arguments::_jvm_flags_file = NULL; 72 char** Arguments::_jvm_flags_array = NULL; 73 int Arguments::_num_jvm_flags = 0; 74 char** Arguments::_jvm_args_array = NULL; 75 int Arguments::_num_jvm_args = 0; 76 char* Arguments::_java_command = NULL; 77 SystemProperty* Arguments::_system_properties = NULL; 78 const char* Arguments::_gc_log_filename = NULL; 79 size_t Arguments::_conservative_max_heap_alignment = 0; 80 Arguments::Mode Arguments::_mode = _mixed; 81 bool Arguments::_java_compiler = false; 82 bool Arguments::_xdebug_mode = false; 83 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 84 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 85 bool Arguments::_sun_java_launcher_is_altjvm = false; 86 87 // These parameters are reset in method parse_vm_init_args() 88 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 89 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 90 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 91 bool Arguments::_ClipInlining = ClipInlining; 92 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 93 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 94 95 bool Arguments::_enable_preview = false; 96 97 char* Arguments::SharedArchivePath = NULL; 98 char* Arguments::SharedDynamicArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 // These are not set by the JDK's built-in launchers, but they can be set by 104 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 105 // JavaVMOption in jni.h. 106 abort_hook_t Arguments::_abort_hook = NULL; 107 exit_hook_t Arguments::_exit_hook = NULL; 108 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 109 110 111 SystemProperty *Arguments::_sun_boot_library_path = NULL; 112 SystemProperty *Arguments::_java_library_path = NULL; 113 SystemProperty *Arguments::_java_home = NULL; 114 SystemProperty *Arguments::_java_class_path = NULL; 115 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 116 SystemProperty *Arguments::_vm_info = NULL; 117 118 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 119 PathString *Arguments::_system_boot_class_path = NULL; 120 bool Arguments::_has_jimage = false; 121 122 char* Arguments::_ext_dirs = NULL; 123 124 bool PathString::set_value(const char *value) { 125 if (_value != NULL) { 126 FreeHeap(_value); 127 } 128 _value = AllocateHeap(strlen(value)+1, mtArguments); 129 assert(_value != NULL, "Unable to allocate space for new path value"); 130 if (_value != NULL) { 131 strcpy(_value, value); 132 } else { 133 // not able to allocate 134 return false; 135 } 136 return true; 137 } 138 139 void PathString::append_value(const char *value) { 140 char *sp; 141 size_t len = 0; 142 if (value != NULL) { 143 len = strlen(value); 144 if (_value != NULL) { 145 len += strlen(_value); 146 } 147 sp = AllocateHeap(len+2, mtArguments); 148 assert(sp != NULL, "Unable to allocate space for new append path value"); 149 if (sp != NULL) { 150 if (_value != NULL) { 151 strcpy(sp, _value); 152 strcat(sp, os::path_separator()); 153 strcat(sp, value); 154 FreeHeap(_value); 155 } else { 156 strcpy(sp, value); 157 } 158 _value = sp; 159 } 160 } 161 } 162 163 PathString::PathString(const char* value) { 164 if (value == NULL) { 165 _value = NULL; 166 } else { 167 _value = AllocateHeap(strlen(value)+1, mtArguments); 168 strcpy(_value, value); 169 } 170 } 171 172 PathString::~PathString() { 173 if (_value != NULL) { 174 FreeHeap(_value); 175 _value = NULL; 176 } 177 } 178 179 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 180 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 181 size_t len = strlen(module_name) + 1; 182 _module_name = AllocateHeap(len, mtInternal); 183 strncpy(_module_name, module_name, len); // copy the trailing null 184 _path = new PathString(path); 185 } 186 187 ModulePatchPath::~ModulePatchPath() { 188 if (_module_name != NULL) { 189 FreeHeap(_module_name); 190 _module_name = NULL; 191 } 192 if (_path != NULL) { 193 delete _path; 194 _path = NULL; 195 } 196 } 197 198 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 199 if (key == NULL) { 200 _key = NULL; 201 } else { 202 _key = AllocateHeap(strlen(key)+1, mtArguments); 203 strcpy(_key, key); 204 } 205 _next = NULL; 206 _internal = internal; 207 _writeable = writeable; 208 } 209 210 AgentLibrary::AgentLibrary(const char* name, const char* options, 211 bool is_absolute_path, void* os_lib, 212 bool instrument_lib) { 213 _name = AllocateHeap(strlen(name)+1, mtArguments); 214 strcpy(_name, name); 215 if (options == NULL) { 216 _options = NULL; 217 } else { 218 _options = AllocateHeap(strlen(options)+1, mtArguments); 219 strcpy(_options, options); 220 } 221 _is_absolute_path = is_absolute_path; 222 _os_lib = os_lib; 223 _next = NULL; 224 _state = agent_invalid; 225 _is_static_lib = false; 226 _is_instrument_lib = instrument_lib; 227 } 228 229 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 230 // part of the option string. 231 static bool match_option(const JavaVMOption *option, const char* name, 232 const char** tail) { 233 size_t len = strlen(name); 234 if (strncmp(option->optionString, name, len) == 0) { 235 *tail = option->optionString + len; 236 return true; 237 } else { 238 return false; 239 } 240 } 241 242 // Check if 'option' matches 'name'. No "tail" is allowed. 243 static bool match_option(const JavaVMOption *option, const char* name) { 244 const char* tail = NULL; 245 bool result = match_option(option, name, &tail); 246 if (tail != NULL && *tail == '\0') { 247 return result; 248 } else { 249 return false; 250 } 251 } 252 253 // Return true if any of the strings in null-terminated array 'names' matches. 254 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 255 // the option must match exactly. 256 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 257 bool tail_allowed) { 258 for (/* empty */; *names != NULL; ++names) { 259 if (match_option(option, *names, tail)) { 260 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 261 return true; 262 } 263 } 264 } 265 return false; 266 } 267 268 #if INCLUDE_JFR 269 static bool _has_jfr_option = false; // is using JFR 270 271 // return true on failure 272 static bool match_jfr_option(const JavaVMOption** option) { 273 assert((*option)->optionString != NULL, "invariant"); 274 char* tail = NULL; 275 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 276 _has_jfr_option = true; 277 return Jfr::on_start_flight_recording_option(option, tail); 278 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 279 _has_jfr_option = true; 280 return Jfr::on_flight_recorder_option(option, tail); 281 } 282 return false; 283 } 284 285 bool Arguments::has_jfr_option() { 286 return _has_jfr_option; 287 } 288 #endif 289 290 static void logOption(const char* opt) { 291 if (PrintVMOptions) { 292 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 293 } 294 } 295 296 bool needs_module_property_warning = false; 297 298 #define MODULE_PROPERTY_PREFIX "jdk.module." 299 #define MODULE_PROPERTY_PREFIX_LEN 11 300 #define ADDEXPORTS "addexports" 301 #define ADDEXPORTS_LEN 10 302 #define ADDREADS "addreads" 303 #define ADDREADS_LEN 8 304 #define ADDOPENS "addopens" 305 #define ADDOPENS_LEN 8 306 #define PATCH "patch" 307 #define PATCH_LEN 5 308 #define ADDMODS "addmods" 309 #define ADDMODS_LEN 7 310 #define LIMITMODS "limitmods" 311 #define LIMITMODS_LEN 9 312 #define PATH "path" 313 #define PATH_LEN 4 314 #define UPGRADE_PATH "upgrade.path" 315 #define UPGRADE_PATH_LEN 12 316 317 void Arguments::add_init_library(const char* name, char* options) { 318 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 319 } 320 321 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 322 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 323 } 324 325 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 326 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 327 } 328 329 // Late-binding agents not started via arguments 330 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 331 _agentList.add(agentLib); 332 } 333 334 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 335 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 336 return ((strncmp(option, property, len) == 0) && 337 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 338 } 339 340 // Return true if property starts with "jdk.module." and its ensuing chars match 341 // any of the reserved module properties. 342 // property should be passed without the leading "-D". 343 bool Arguments::is_internal_module_property(const char* property) { 344 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 345 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 346 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 347 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 348 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 349 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 350 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 351 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 352 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 353 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 354 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 355 return true; 356 } 357 } 358 return false; 359 } 360 361 // Process java launcher properties. 362 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 363 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 364 // Must do this before setting up other system properties, 365 // as some of them may depend on launcher type. 366 for (int index = 0; index < args->nOptions; index++) { 367 const JavaVMOption* option = args->options + index; 368 const char* tail; 369 370 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 371 process_java_launcher_argument(tail, option->extraInfo); 372 continue; 373 } 374 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 375 if (strcmp(tail, "true") == 0) { 376 _sun_java_launcher_is_altjvm = true; 377 } 378 continue; 379 } 380 } 381 } 382 383 // Initialize system properties key and value. 384 void Arguments::init_system_properties() { 385 386 // Set up _system_boot_class_path which is not a property but 387 // relies heavily on argument processing and the jdk.boot.class.path.append 388 // property. It is used to store the underlying system boot class path. 389 _system_boot_class_path = new PathString(NULL); 390 391 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 392 "Java Virtual Machine Specification", false)); 393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 394 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 395 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 396 397 // Initialize the vm.info now, but it will need updating after argument parsing. 398 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 399 400 // Following are JVMTI agent writable properties. 401 // Properties values are set to NULL and they are 402 // os specific they are initialized in os::init_system_properties_values(). 403 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 404 _java_library_path = new SystemProperty("java.library.path", NULL, true); 405 _java_home = new SystemProperty("java.home", NULL, true); 406 _java_class_path = new SystemProperty("java.class.path", "", true); 407 // jdk.boot.class.path.append is a non-writeable, internal property. 408 // It can only be set by either: 409 // - -Xbootclasspath/a: 410 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 411 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 412 413 // Add to System Property list. 414 PropertyList_add(&_system_properties, _sun_boot_library_path); 415 PropertyList_add(&_system_properties, _java_library_path); 416 PropertyList_add(&_system_properties, _java_home); 417 PropertyList_add(&_system_properties, _java_class_path); 418 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 419 PropertyList_add(&_system_properties, _vm_info); 420 421 // Set OS specific system properties values 422 os::init_system_properties_values(); 423 } 424 425 // Update/Initialize System properties after JDK version number is known 426 void Arguments::init_version_specific_system_properties() { 427 enum { bufsz = 16 }; 428 char buffer[bufsz]; 429 const char* spec_vendor = "Oracle Corporation"; 430 uint32_t spec_version = JDK_Version::current().major_version(); 431 432 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 433 434 PropertyList_add(&_system_properties, 435 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 436 PropertyList_add(&_system_properties, 437 new SystemProperty("java.vm.specification.version", buffer, false)); 438 PropertyList_add(&_system_properties, 439 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 440 } 441 442 /* 443 * -XX argument processing: 444 * 445 * -XX arguments are defined in several places, such as: 446 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 447 * -XX arguments are parsed in parse_argument(). 448 * -XX argument bounds checking is done in check_vm_args_consistency(). 449 * 450 * Over time -XX arguments may change. There are mechanisms to handle common cases: 451 * 452 * ALIASED: An option that is simply another name for another option. This is often 453 * part of the process of deprecating a flag, but not all aliases need 454 * to be deprecated. 455 * 456 * Create an alias for an option by adding the old and new option names to the 457 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 458 * 459 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 460 * support may be removed in the future. Both regular and aliased options may be 461 * deprecated. 462 * 463 * Add a deprecation warning for an option (or alias) by adding an entry in the 464 * "special_jvm_flags" table and setting the "deprecated_in" field. 465 * Often an option "deprecated" in one major release will 466 * be made "obsolete" in the next. In this case the entry should also have its 467 * "obsolete_in" field set. 468 * 469 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 470 * on the command line. A warning is printed to let the user know that option might not 471 * be accepted in the future. 472 * 473 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 474 * table and setting the "obsolete_in" field. 475 * 476 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 477 * to the current JDK version. The system will flatly refuse to admit the existence of 478 * the flag. This allows a flag to die automatically over JDK releases. 479 * 480 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 481 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 482 * - Newly obsolete or expired deprecated options should have their global variable 483 * definitions removed (from globals.hpp, etc) and related implementations removed. 484 * 485 * Recommended approach for removing options: 486 * 487 * To remove options commonly used by customers (e.g. product -XX options), use 488 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 489 * 490 * To remove internal options (e.g. diagnostic, experimental, develop options), use 491 * a 2-step model adding major release numbers to the obsolete and expire columns. 492 * 493 * To change the name of an option, use the alias table as well as a 2-step 494 * model adding major release numbers to the deprecate and expire columns. 495 * Think twice about aliasing commonly used customer options. 496 * 497 * There are times when it is appropriate to leave a future release number as undefined. 498 * 499 * Tests: Aliases should be tested in VMAliasOptions.java. 500 * Deprecated options should be tested in VMDeprecatedOptions.java. 501 */ 502 503 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 504 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 505 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 506 // the command-line as usual, but will issue a warning. 507 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 508 // the command-line, while issuing a warning and ignoring the flag value. 509 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 510 // existence of the flag. 511 // 512 // MANUAL CLEANUP ON JDK VERSION UPDATES: 513 // This table ensures that the handling of options will update automatically when the JDK 514 // version is incremented, but the source code needs to be cleanup up manually: 515 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 516 // variable should be removed, as well as users of the variable. 517 // - As "deprecated" options age into "obsolete" options, move the entry into the 518 // "Obsolete Flags" section of the table. 519 // - All expired options should be removed from the table. 520 static SpecialFlag const special_jvm_flags[] = { 521 // -------------- Deprecated Flags -------------- 522 // --- Non-alias flags - sorted by obsolete_in then expired_in: 523 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 524 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 525 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 526 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 527 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 528 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() }, 529 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 530 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 531 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 532 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 533 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 534 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 535 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 536 { "G1RSetScanBlockSize", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 537 538 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 539 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 540 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 541 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 542 543 // -------------- Obsolete Flags - sorted by expired_in -------------- 544 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 545 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 546 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 547 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 548 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 549 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 550 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 551 { "FailOverToOldVerifier", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 552 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 553 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 554 555 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 556 // These entries will generate build errors. Their purpose is to test the macros. 557 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 558 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 559 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 560 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 561 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 562 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 563 #endif 564 565 { NULL, JDK_Version(0), JDK_Version(0) } 566 }; 567 568 // Flags that are aliases for other flags. 569 typedef struct { 570 const char* alias_name; 571 const char* real_name; 572 } AliasedFlag; 573 574 static AliasedFlag const aliased_jvm_flags[] = { 575 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 576 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 577 { NULL, NULL} 578 }; 579 580 // NOTE: A compatibility request will be necessary for each alias to be removed. 581 static AliasedLoggingFlag const aliased_logging_flags[] = { 582 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 583 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 584 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 585 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 586 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 587 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 588 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 589 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 590 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 591 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 592 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) }, 593 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 594 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 595 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 596 { "TraceNMethodInstalls", LogLevel::Info, true, LOG_TAGS(nmethod, install) }, 597 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 598 }; 599 600 #ifndef PRODUCT 601 // These options are removed in jdk9. Remove this code for jdk10. 602 static AliasedFlag const removed_develop_logging_flags[] = { 603 { "TraceClassInitialization", "-Xlog:class+init" }, 604 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 605 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 606 { "TraceItables", "-Xlog:itables=debug" }, 607 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 608 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 609 { "TraceStartupTime", "-Xlog:startuptime" }, 610 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 611 { "PrintVtables", "-Xlog:vtables=debug" }, 612 { "VerboseVerification", "-Xlog:verification" }, 613 { NULL, NULL } 614 }; 615 #endif //PRODUCT 616 617 // Return true if "v" is less than "other", where "other" may be "undefined". 618 static bool version_less_than(JDK_Version v, JDK_Version other) { 619 assert(!v.is_undefined(), "must be defined"); 620 if (!other.is_undefined() && v.compare(other) >= 0) { 621 return false; 622 } else { 623 return true; 624 } 625 } 626 627 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 628 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 629 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 630 flag = special_jvm_flags[i]; 631 return true; 632 } 633 } 634 return false; 635 } 636 637 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 638 assert(version != NULL, "Must provide a version buffer"); 639 SpecialFlag flag; 640 if (lookup_special_flag(flag_name, flag)) { 641 if (!flag.obsolete_in.is_undefined()) { 642 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 643 *version = flag.obsolete_in; 644 return true; 645 } 646 } 647 } 648 return false; 649 } 650 651 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 652 assert(version != NULL, "Must provide a version buffer"); 653 SpecialFlag flag; 654 if (lookup_special_flag(flag_name, flag)) { 655 if (!flag.deprecated_in.is_undefined()) { 656 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 657 version_less_than(JDK_Version::current(), flag.expired_in)) { 658 *version = flag.deprecated_in; 659 return 1; 660 } else { 661 return -1; 662 } 663 } 664 } 665 return 0; 666 } 667 668 #ifndef PRODUCT 669 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 670 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 671 const AliasedFlag& flag = removed_develop_logging_flags[i]; 672 if (strcmp(flag.alias_name, name) == 0) { 673 return flag.real_name; 674 } 675 } 676 return NULL; 677 } 678 #endif // PRODUCT 679 680 const char* Arguments::real_flag_name(const char *flag_name) { 681 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 682 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 683 if (strcmp(flag_status.alias_name, flag_name) == 0) { 684 return flag_status.real_name; 685 } 686 } 687 return flag_name; 688 } 689 690 #ifdef ASSERT 691 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 692 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 693 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 694 return true; 695 } 696 } 697 return false; 698 } 699 700 // Verifies the correctness of the entries in the special_jvm_flags table. 701 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 702 // version being earlier than the deprecation version, then a warning is issued 703 // and verification fails - by returning false. If it is detected that the table 704 // is out of date, with respect to the current version, then a warning is issued 705 // but verification does not fail. This allows the VM to operate when the version 706 // is first updated, without needing to update all the impacted flags at the 707 // same time. 708 static bool verify_special_jvm_flags() { 709 bool success = true; 710 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 711 const SpecialFlag& flag = special_jvm_flags[i]; 712 if (lookup_special_flag(flag.name, i)) { 713 warning("Duplicate special flag declaration \"%s\"", flag.name); 714 success = false; 715 } 716 if (flag.deprecated_in.is_undefined() && 717 flag.obsolete_in.is_undefined()) { 718 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 719 success = false; 720 } 721 722 if (!flag.deprecated_in.is_undefined()) { 723 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 724 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 725 success = false; 726 } 727 728 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 729 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 730 success = false; 731 } 732 } 733 734 if (!flag.obsolete_in.is_undefined()) { 735 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 736 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 737 success = false; 738 } 739 740 // if flag has become obsolete it should not have a "globals" flag defined anymore. 741 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 742 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 743 // Temporarily disable the warning: 8196739 744 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 745 } 746 } 747 } 748 749 if (!flag.expired_in.is_undefined()) { 750 // if flag has become expired it should not have a "globals" flag defined anymore. 751 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 752 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 753 // Temporarily disable the warning: 8196739 754 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 755 } 756 } 757 } 758 759 } 760 return success; 761 } 762 #endif 763 764 // Parses a size specification string. 765 bool Arguments::atojulong(const char *s, julong* result) { 766 julong n = 0; 767 768 // First char must be a digit. Don't allow negative numbers or leading spaces. 769 if (!isdigit(*s)) { 770 return false; 771 } 772 773 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 774 char* remainder; 775 errno = 0; 776 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 777 if (errno != 0) { 778 return false; 779 } 780 781 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 782 if (remainder == s || strlen(remainder) > 1) { 783 return false; 784 } 785 786 switch (*remainder) { 787 case 'T': case 't': 788 *result = n * G * K; 789 // Check for overflow. 790 if (*result/((julong)G * K) != n) return false; 791 return true; 792 case 'G': case 'g': 793 *result = n * G; 794 if (*result/G != n) return false; 795 return true; 796 case 'M': case 'm': 797 *result = n * M; 798 if (*result/M != n) return false; 799 return true; 800 case 'K': case 'k': 801 *result = n * K; 802 if (*result/K != n) return false; 803 return true; 804 case '\0': 805 *result = n; 806 return true; 807 default: 808 return false; 809 } 810 } 811 812 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 813 if (size < min_size) return arg_too_small; 814 if (size > max_size) return arg_too_big; 815 return arg_in_range; 816 } 817 818 // Describe an argument out of range error 819 void Arguments::describe_range_error(ArgsRange errcode) { 820 switch(errcode) { 821 case arg_too_big: 822 jio_fprintf(defaultStream::error_stream(), 823 "The specified size exceeds the maximum " 824 "representable size.\n"); 825 break; 826 case arg_too_small: 827 case arg_unreadable: 828 case arg_in_range: 829 // do nothing for now 830 break; 831 default: 832 ShouldNotReachHere(); 833 } 834 } 835 836 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) { 837 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) { 838 return true; 839 } else { 840 return false; 841 } 842 } 843 844 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 845 char* end; 846 errno = 0; 847 double v = strtod(value, &end); 848 if ((errno != 0) || (*end != 0)) { 849 return false; 850 } 851 852 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) { 853 return true; 854 } 855 return false; 856 } 857 858 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 859 julong v; 860 int int_v; 861 intx intx_v; 862 bool is_neg = false; 863 864 if (flag == NULL) { 865 return false; 866 } 867 868 // Check the sign first since atojulong() parses only unsigned values. 869 if (*value == '-') { 870 if (!flag->is_intx() && !flag->is_int()) { 871 return false; 872 } 873 value++; 874 is_neg = true; 875 } 876 if (!Arguments::atojulong(value, &v)) { 877 return false; 878 } 879 if (flag->is_int()) { 880 int_v = (int) v; 881 if (is_neg) { 882 int_v = -int_v; 883 } 884 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS; 885 } else if (flag->is_uint()) { 886 uint uint_v = (uint) v; 887 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS; 888 } else if (flag->is_intx()) { 889 intx_v = (intx) v; 890 if (is_neg) { 891 intx_v = -intx_v; 892 } 893 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS; 894 } else if (flag->is_uintx()) { 895 uintx uintx_v = (uintx) v; 896 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS; 897 } else if (flag->is_uint64_t()) { 898 uint64_t uint64_t_v = (uint64_t) v; 899 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS; 900 } else if (flag->is_size_t()) { 901 size_t size_t_v = (size_t) v; 902 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS; 903 } else if (flag->is_double()) { 904 double double_v = (double) v; 905 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS; 906 } else { 907 return false; 908 } 909 } 910 911 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) { 912 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false; 913 // Contract: JVMFlag always returns a pointer that needs freeing. 914 FREE_C_HEAP_ARRAY(char, value); 915 return true; 916 } 917 918 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) { 919 const char* old_value = ""; 920 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false; 921 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 922 size_t new_len = strlen(new_value); 923 const char* value; 924 char* free_this_too = NULL; 925 if (old_len == 0) { 926 value = new_value; 927 } else if (new_len == 0) { 928 value = old_value; 929 } else { 930 size_t length = old_len + 1 + new_len + 1; 931 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 932 // each new setting adds another LINE to the switch: 933 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 934 value = buf; 935 free_this_too = buf; 936 } 937 (void) JVMFlag::ccstrAtPut(flag, &value, origin); 938 // JVMFlag always returns a pointer that needs freeing. 939 FREE_C_HEAP_ARRAY(char, value); 940 // JVMFlag made its own copy, so I must delete my own temp. buffer. 941 FREE_C_HEAP_ARRAY(char, free_this_too); 942 return true; 943 } 944 945 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 946 const char* real_name = real_flag_name(arg); 947 JDK_Version since = JDK_Version(); 948 switch (is_deprecated_flag(arg, &since)) { 949 case -1: 950 return NULL; // obsolete or expired, don't process normally 951 case 0: 952 return real_name; 953 case 1: { 954 if (warn) { 955 char version[256]; 956 since.to_string(version, sizeof(version)); 957 if (real_name != arg) { 958 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 959 arg, version, real_name); 960 } else { 961 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 962 arg, version); 963 } 964 } 965 return real_name; 966 } 967 } 968 ShouldNotReachHere(); 969 return NULL; 970 } 971 972 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 973 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 974 // Set tagset string buffer at max size of 256, large enough for any alias tagset 975 const int max_tagset_size = 256; 976 int max_tagset_len = max_tagset_size - 1; 977 char tagset_buffer[max_tagset_size]; 978 tagset_buffer[0] = '\0'; 979 980 // Write tag-set for aliased logging option, in string list form 981 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 982 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 983 if (i > 0) { 984 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 985 } 986 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 987 } 988 if (!alf.exactMatch) { 989 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 990 } 991 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 992 (on) ? "+" : "-", 993 name, 994 tagset_buffer, 995 (on) ? LogLevel::name(alf.level) : "off"); 996 } 997 998 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 999 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 1000 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1001 if (strcmp(alf.alias_name, name) == 0) { 1002 log_deprecated_flag(name, on, alf); 1003 return alf; 1004 } 1005 } 1006 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1007 return a; 1008 } 1009 1010 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) { 1011 1012 // range of acceptable characters spelled out for portability reasons 1013 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1014 #define BUFLEN 255 1015 char name[BUFLEN+1]; 1016 char dummy; 1017 const char* real_name; 1018 bool warn_if_deprecated = true; 1019 1020 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1021 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1022 if (alf.alias_name != NULL){ 1023 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1024 return true; 1025 } 1026 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1027 if (real_name == NULL) { 1028 return false; 1029 } 1030 JVMFlag* flag = JVMFlag::find_flag(real_name); 1031 return set_bool_flag(flag, false, origin); 1032 } 1033 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1034 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1035 if (alf.alias_name != NULL){ 1036 LogConfiguration::configure_stdout(alf.level, 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, true, origin); 1045 } 1046 1047 char punct; 1048 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1049 const char* value = strchr(arg, '=') + 1; 1050 1051 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1052 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1053 if (alf.alias_name != NULL) { 1054 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1055 return true; 1056 } 1057 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1058 if (real_name == NULL) { 1059 return false; 1060 } 1061 JVMFlag* flag = JVMFlag::find_flag(real_name); 1062 if (flag != NULL && flag->is_ccstr()) { 1063 if (flag->ccstr_accumulates()) { 1064 return append_to_string_flag(flag, value, origin); 1065 } else { 1066 if (value[0] == '\0') { 1067 value = NULL; 1068 } 1069 return set_string_flag(flag, value, origin); 1070 } 1071 } else { 1072 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1073 } 1074 } 1075 1076 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1077 const char* value = strchr(arg, '=') + 1; 1078 // -XX:Foo:=xxx will reset the string flag to the given value. 1079 if (value[0] == '\0') { 1080 value = NULL; 1081 } 1082 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1083 if (real_name == NULL) { 1084 return false; 1085 } 1086 JVMFlag* flag = JVMFlag::find_flag(real_name); 1087 return set_string_flag(flag, value, origin); 1088 } 1089 1090 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1091 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1092 #define NUMBER_RANGE "[0123456789eE+-]" 1093 char value[BUFLEN + 1]; 1094 char value2[BUFLEN + 1]; 1095 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1096 // Looks like a floating-point number -- try again with more lenient format string 1097 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1098 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1099 if (real_name == NULL) { 1100 return false; 1101 } 1102 JVMFlag* flag = JVMFlag::find_flag(real_name); 1103 return set_fp_numeric_flag(flag, value, origin); 1104 } 1105 } 1106 1107 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1108 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1109 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1110 if (real_name == NULL) { 1111 return false; 1112 } 1113 JVMFlag* flag = JVMFlag::find_flag(real_name); 1114 return set_numeric_flag(flag, value, origin); 1115 } 1116 1117 return false; 1118 } 1119 1120 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1121 assert(bldarray != NULL, "illegal argument"); 1122 1123 if (arg == NULL) { 1124 return; 1125 } 1126 1127 int new_count = *count + 1; 1128 1129 // expand the array and add arg to the last element 1130 if (*bldarray == NULL) { 1131 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1132 } else { 1133 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1134 } 1135 (*bldarray)[*count] = os::strdup_check_oom(arg); 1136 *count = new_count; 1137 } 1138 1139 void Arguments::build_jvm_args(const char* arg) { 1140 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1141 } 1142 1143 void Arguments::build_jvm_flags(const char* arg) { 1144 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1145 } 1146 1147 // utility function to return a string that concatenates all 1148 // strings in a given char** array 1149 const char* Arguments::build_resource_string(char** args, int count) { 1150 if (args == NULL || count == 0) { 1151 return NULL; 1152 } 1153 size_t length = 0; 1154 for (int i = 0; i < count; i++) { 1155 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1156 } 1157 char* s = NEW_RESOURCE_ARRAY(char, length); 1158 char* dst = s; 1159 for (int j = 0; j < count; j++) { 1160 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1161 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1162 dst += offset; 1163 length -= offset; 1164 } 1165 return (const char*) s; 1166 } 1167 1168 void Arguments::print_on(outputStream* st) { 1169 st->print_cr("VM Arguments:"); 1170 if (num_jvm_flags() > 0) { 1171 st->print("jvm_flags: "); print_jvm_flags_on(st); 1172 st->cr(); 1173 } 1174 if (num_jvm_args() > 0) { 1175 st->print("jvm_args: "); print_jvm_args_on(st); 1176 st->cr(); 1177 } 1178 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1179 if (_java_class_path != NULL) { 1180 char* path = _java_class_path->value(); 1181 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1182 } 1183 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1184 } 1185 1186 void Arguments::print_summary_on(outputStream* st) { 1187 // Print the command line. Environment variables that are helpful for 1188 // reproducing the problem are written later in the hs_err file. 1189 // flags are from setting file 1190 if (num_jvm_flags() > 0) { 1191 st->print_raw("Settings File: "); 1192 print_jvm_flags_on(st); 1193 st->cr(); 1194 } 1195 // args are the command line and environment variable arguments. 1196 st->print_raw("Command Line: "); 1197 if (num_jvm_args() > 0) { 1198 print_jvm_args_on(st); 1199 } 1200 // this is the classfile and any arguments to the java program 1201 if (java_command() != NULL) { 1202 st->print("%s", java_command()); 1203 } 1204 st->cr(); 1205 } 1206 1207 void Arguments::print_jvm_flags_on(outputStream* st) { 1208 if (_num_jvm_flags > 0) { 1209 for (int i=0; i < _num_jvm_flags; i++) { 1210 st->print("%s ", _jvm_flags_array[i]); 1211 } 1212 } 1213 } 1214 1215 void Arguments::print_jvm_args_on(outputStream* st) { 1216 if (_num_jvm_args > 0) { 1217 for (int i=0; i < _num_jvm_args; i++) { 1218 st->print("%s ", _jvm_args_array[i]); 1219 } 1220 } 1221 } 1222 1223 bool Arguments::process_argument(const char* arg, 1224 jboolean ignore_unrecognized, 1225 JVMFlag::Flags origin) { 1226 JDK_Version since = JDK_Version(); 1227 1228 if (parse_argument(arg, origin)) { 1229 return true; 1230 } 1231 1232 // Determine if the flag has '+', '-', or '=' characters. 1233 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1234 const char* const argname = has_plus_minus ? arg + 1 : arg; 1235 1236 size_t arg_len; 1237 const char* equal_sign = strchr(argname, '='); 1238 if (equal_sign == NULL) { 1239 arg_len = strlen(argname); 1240 } else { 1241 arg_len = equal_sign - argname; 1242 } 1243 1244 // Only make the obsolete check for valid arguments. 1245 if (arg_len <= BUFLEN) { 1246 // Construct a string which consists only of the argument name without '+', '-', or '='. 1247 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1248 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1249 if (is_obsolete_flag(stripped_argname, &since)) { 1250 char version[256]; 1251 since.to_string(version, sizeof(version)); 1252 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1253 return true; 1254 } 1255 #ifndef PRODUCT 1256 else { 1257 const char* replacement; 1258 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1259 log_warning(arguments)("%s has been removed. Please use %s instead.", 1260 stripped_argname, 1261 replacement); 1262 return false; 1263 } 1264 } 1265 #endif //PRODUCT 1266 } 1267 1268 // For locked flags, report a custom error message if available. 1269 // Otherwise, report the standard unrecognized VM option. 1270 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1271 if (found_flag != NULL) { 1272 char locked_message_buf[BUFLEN]; 1273 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1274 if (strlen(locked_message_buf) == 0) { 1275 if (found_flag->is_bool() && !has_plus_minus) { 1276 jio_fprintf(defaultStream::error_stream(), 1277 "Missing +/- setting for VM option '%s'\n", argname); 1278 } else if (!found_flag->is_bool() && has_plus_minus) { 1279 jio_fprintf(defaultStream::error_stream(), 1280 "Unexpected +/- setting in VM option '%s'\n", argname); 1281 } else { 1282 jio_fprintf(defaultStream::error_stream(), 1283 "Improperly specified VM option '%s'\n", argname); 1284 } 1285 } else { 1286 #ifdef PRODUCT 1287 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1288 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1289 if (ignore_unrecognized && mismatched) { 1290 return true; 1291 } 1292 #endif 1293 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1294 } 1295 } else { 1296 if (ignore_unrecognized) { 1297 return true; 1298 } 1299 jio_fprintf(defaultStream::error_stream(), 1300 "Unrecognized VM option '%s'\n", argname); 1301 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1302 if (fuzzy_matched != NULL) { 1303 jio_fprintf(defaultStream::error_stream(), 1304 "Did you mean '%s%s%s'? ", 1305 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1306 fuzzy_matched->_name, 1307 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1308 } 1309 } 1310 1311 // allow for commandline "commenting out" options like -XX:#+Verbose 1312 return arg[0] == '#'; 1313 } 1314 1315 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1316 FILE* stream = fopen(file_name, "rb"); 1317 if (stream == NULL) { 1318 if (should_exist) { 1319 jio_fprintf(defaultStream::error_stream(), 1320 "Could not open settings file %s\n", file_name); 1321 return false; 1322 } else { 1323 return true; 1324 } 1325 } 1326 1327 char token[1024]; 1328 int pos = 0; 1329 1330 bool in_white_space = true; 1331 bool in_comment = false; 1332 bool in_quote = false; 1333 char quote_c = 0; 1334 bool result = true; 1335 1336 int c = getc(stream); 1337 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1338 if (in_white_space) { 1339 if (in_comment) { 1340 if (c == '\n') in_comment = false; 1341 } else { 1342 if (c == '#') in_comment = true; 1343 else if (!isspace(c)) { 1344 in_white_space = false; 1345 token[pos++] = c; 1346 } 1347 } 1348 } else { 1349 if (c == '\n' || (!in_quote && isspace(c))) { 1350 // token ends at newline, or at unquoted whitespace 1351 // this allows a way to include spaces in string-valued options 1352 token[pos] = '\0'; 1353 logOption(token); 1354 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1355 build_jvm_flags(token); 1356 pos = 0; 1357 in_white_space = true; 1358 in_quote = false; 1359 } else if (!in_quote && (c == '\'' || c == '"')) { 1360 in_quote = true; 1361 quote_c = c; 1362 } else if (in_quote && (c == quote_c)) { 1363 in_quote = false; 1364 } else { 1365 token[pos++] = c; 1366 } 1367 } 1368 c = getc(stream); 1369 } 1370 if (pos > 0) { 1371 token[pos] = '\0'; 1372 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1373 build_jvm_flags(token); 1374 } 1375 fclose(stream); 1376 return result; 1377 } 1378 1379 //============================================================================================================= 1380 // Parsing of properties (-D) 1381 1382 const char* Arguments::get_property(const char* key) { 1383 return PropertyList_get_value(system_properties(), key); 1384 } 1385 1386 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1387 const char* eq = strchr(prop, '='); 1388 const char* key; 1389 const char* value = ""; 1390 1391 if (eq == NULL) { 1392 // property doesn't have a value, thus use passed string 1393 key = prop; 1394 } else { 1395 // property have a value, thus extract it and save to the 1396 // allocated string 1397 size_t key_len = eq - prop; 1398 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1399 1400 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1401 key = tmp_key; 1402 1403 value = &prop[key_len + 1]; 1404 } 1405 1406 if (strcmp(key, "java.compiler") == 0) { 1407 process_java_compiler_argument(value); 1408 // Record value in Arguments, but let it get passed to Java. 1409 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1410 // sun.java.launcher.is_altjvm property is 1411 // private and is processed in process_sun_java_launcher_properties(); 1412 // the sun.java.launcher property is passed on to the java application 1413 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1414 // append is true, writable is true, internal is false 1415 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1416 WriteableProperty, ExternalProperty); 1417 } else { 1418 if (strcmp(key, "sun.java.command") == 0) { 1419 char *old_java_command = _java_command; 1420 _java_command = os::strdup_check_oom(value, mtArguments); 1421 if (old_java_command != NULL) { 1422 os::free(old_java_command); 1423 } 1424 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1425 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1426 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1427 // its value without going through the property list or making a Java call. 1428 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1429 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1430 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1431 os::free((void *)old_java_vendor_url_bug); 1432 } 1433 } 1434 1435 // Create new property and add at the end of the list 1436 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1437 } 1438 1439 if (key != prop) { 1440 // SystemProperty copy passed value, thus free previously allocated 1441 // memory 1442 FreeHeap((void *)key); 1443 } 1444 1445 return true; 1446 } 1447 1448 #if INCLUDE_CDS 1449 const char* unsupported_properties[] = { "jdk.module.limitmods", 1450 "jdk.module.upgrade.path", 1451 "jdk.module.patch.0" }; 1452 const char* unsupported_options[] = { "--limit-modules", 1453 "--upgrade-module-path", 1454 "--patch-module" 1455 }; 1456 void Arguments::check_unsupported_dumping_properties() { 1457 assert(is_dumping_archive(), 1458 "this function is only used with CDS dump time"); 1459 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1460 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1461 SystemProperty* sp = system_properties(); 1462 while (sp != NULL) { 1463 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1464 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1465 vm_exit_during_initialization( 1466 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1467 } 1468 } 1469 sp = sp->next(); 1470 } 1471 1472 // Check for an exploded module build in use with -Xshare:dump. 1473 if (!has_jimage()) { 1474 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1475 } 1476 } 1477 1478 bool Arguments::check_unsupported_cds_runtime_properties() { 1479 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1480 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1481 if (ArchiveClassesAtExit != NULL) { 1482 // dynamic dumping, just return false for now. 1483 // check_unsupported_dumping_properties() will be called later to check the same set of 1484 // properties, and will exit the VM with the correct error message if the unsupported properties 1485 // are used. 1486 return false; 1487 } 1488 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1489 if (get_property(unsupported_properties[i]) != NULL) { 1490 if (RequireSharedSpaces) { 1491 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1492 } 1493 return true; 1494 } 1495 } 1496 return false; 1497 } 1498 #endif 1499 1500 //=========================================================================================================== 1501 // Setting int/mixed/comp mode flags 1502 1503 void Arguments::set_mode_flags(Mode mode) { 1504 // Set up default values for all flags. 1505 // If you add a flag to any of the branches below, 1506 // add a default value for it here. 1507 set_java_compiler(false); 1508 _mode = mode; 1509 1510 // Ensure Agent_OnLoad has the correct initial values. 1511 // This may not be the final mode; mode may change later in onload phase. 1512 PropertyList_unique_add(&_system_properties, "java.vm.info", 1513 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1514 1515 UseInterpreter = true; 1516 UseCompiler = true; 1517 UseLoopCounter = true; 1518 1519 // Default values may be platform/compiler dependent - 1520 // use the saved values 1521 ClipInlining = Arguments::_ClipInlining; 1522 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1523 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1524 BackgroundCompilation = Arguments::_BackgroundCompilation; 1525 if (TieredCompilation) { 1526 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1527 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1528 } 1529 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1530 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1531 } 1532 } 1533 1534 // Change from defaults based on mode 1535 switch (mode) { 1536 default: 1537 ShouldNotReachHere(); 1538 break; 1539 case _int: 1540 UseCompiler = false; 1541 UseLoopCounter = false; 1542 AlwaysCompileLoopMethods = false; 1543 UseOnStackReplacement = false; 1544 break; 1545 case _mixed: 1546 // same as default 1547 break; 1548 case _comp: 1549 UseInterpreter = false; 1550 BackgroundCompilation = false; 1551 ClipInlining = false; 1552 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1553 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1554 // compile a level 4 (C2) and then continue executing it. 1555 if (TieredCompilation) { 1556 Tier3InvokeNotifyFreqLog = 0; 1557 Tier4InvocationThreshold = 0; 1558 } 1559 break; 1560 } 1561 } 1562 1563 // Conflict: required to use shared spaces (-Xshare:on), but 1564 // incompatible command line options were chosen. 1565 static void no_shared_spaces(const char* message) { 1566 if (RequireSharedSpaces) { 1567 jio_fprintf(defaultStream::error_stream(), 1568 "Class data sharing is inconsistent with other specified options.\n"); 1569 vm_exit_during_initialization("Unable to use shared archive", message); 1570 } else { 1571 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1572 } 1573 } 1574 1575 void set_object_alignment() { 1576 // Object alignment. 1577 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1578 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1579 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1580 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1581 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1582 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1583 1584 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1585 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1586 1587 // Oop encoding heap max 1588 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1589 1590 if (SurvivorAlignmentInBytes == 0) { 1591 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1592 } 1593 } 1594 1595 size_t Arguments::max_heap_for_compressed_oops() { 1596 // Avoid sign flip. 1597 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1598 // We need to fit both the NULL page and the heap into the memory budget, while 1599 // keeping alignment constraints of the heap. To guarantee the latter, as the 1600 // NULL page is located before the heap, we pad the NULL page to the conservative 1601 // maximum alignment that the GC may ever impose upon the heap. 1602 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1603 _conservative_max_heap_alignment); 1604 1605 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1606 NOT_LP64(ShouldNotReachHere(); return 0); 1607 } 1608 1609 void Arguments::set_use_compressed_oops() { 1610 #ifndef ZERO 1611 #ifdef _LP64 1612 // MaxHeapSize is not set up properly at this point, but 1613 // the only value that can override MaxHeapSize if we are 1614 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1615 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1616 1617 if (max_heap_size <= max_heap_for_compressed_oops()) { 1618 #if !defined(COMPILER1) || defined(TIERED) 1619 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1620 FLAG_SET_ERGO(UseCompressedOops, true); 1621 } 1622 #endif 1623 } else { 1624 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1625 warning("Max heap size too large for Compressed Oops"); 1626 FLAG_SET_DEFAULT(UseCompressedOops, false); 1627 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1628 } 1629 } 1630 #endif // _LP64 1631 #endif // ZERO 1632 } 1633 1634 1635 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1636 // set_use_compressed_oops(). 1637 void Arguments::set_use_compressed_klass_ptrs() { 1638 #ifndef ZERO 1639 #ifdef _LP64 1640 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1641 if (!UseCompressedOops) { 1642 if (UseCompressedClassPointers) { 1643 warning("UseCompressedClassPointers requires UseCompressedOops"); 1644 } 1645 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1646 } else { 1647 // Turn on UseCompressedClassPointers too 1648 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1649 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1650 } 1651 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1652 if (UseCompressedClassPointers) { 1653 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1654 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1655 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1656 } 1657 } 1658 } 1659 #endif // _LP64 1660 #endif // !ZERO 1661 } 1662 1663 void Arguments::set_conservative_max_heap_alignment() { 1664 // The conservative maximum required alignment for the heap is the maximum of 1665 // the alignments imposed by several sources: any requirements from the heap 1666 // itself and the maximum page size we may run the VM with. 1667 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1668 _conservative_max_heap_alignment = MAX4(heap_alignment, 1669 (size_t)os::vm_allocation_granularity(), 1670 os::max_page_size(), 1671 GCArguments::compute_heap_alignment()); 1672 } 1673 1674 jint Arguments::set_ergonomics_flags() { 1675 GCConfig::initialize(); 1676 1677 set_conservative_max_heap_alignment(); 1678 1679 #ifndef ZERO 1680 #ifdef _LP64 1681 set_use_compressed_oops(); 1682 1683 // set_use_compressed_klass_ptrs() must be called after calling 1684 // set_use_compressed_oops(). 1685 set_use_compressed_klass_ptrs(); 1686 1687 // Also checks that certain machines are slower with compressed oops 1688 // in vm_version initialization code. 1689 #endif // _LP64 1690 #endif // !ZERO 1691 1692 return JNI_OK; 1693 } 1694 1695 julong Arguments::limit_by_allocatable_memory(julong limit) { 1696 julong max_allocatable; 1697 julong result = limit; 1698 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1699 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1700 } 1701 return result; 1702 } 1703 1704 // Use static initialization to get the default before parsing 1705 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1706 1707 void Arguments::set_heap_size() { 1708 julong phys_mem; 1709 1710 // If the user specified one of these options, they 1711 // want specific memory sizing so do not limit memory 1712 // based on compressed oops addressability. 1713 // Also, memory limits will be calculated based on 1714 // available os physical memory, not our MaxRAM limit, 1715 // unless MaxRAM is also specified. 1716 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1717 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1718 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1719 !FLAG_IS_DEFAULT(MinRAMFraction) || 1720 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1721 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1722 !FLAG_IS_DEFAULT(MaxRAM)); 1723 if (override_coop_limit) { 1724 if (FLAG_IS_DEFAULT(MaxRAM)) { 1725 phys_mem = os::physical_memory(); 1726 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1727 } else { 1728 phys_mem = (julong)MaxRAM; 1729 } 1730 } else { 1731 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1732 : (julong)MaxRAM; 1733 } 1734 1735 1736 // Convert deprecated flags 1737 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1738 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1739 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1740 1741 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1742 !FLAG_IS_DEFAULT(MinRAMFraction)) 1743 MinRAMPercentage = 100.0 / MinRAMFraction; 1744 1745 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1746 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1747 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1748 1749 // If the maximum heap size has not been set with -Xmx, 1750 // then set it as fraction of the size of physical memory, 1751 // respecting the maximum and minimum sizes of the heap. 1752 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1753 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1754 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1755 if (reasonable_min < MaxHeapSize) { 1756 // Small physical memory, so use a minimum fraction of it for the heap 1757 reasonable_max = reasonable_min; 1758 } else { 1759 // Not-small physical memory, so require a heap at least 1760 // as large as MaxHeapSize 1761 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1762 } 1763 1764 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1765 // Limit the heap size to ErgoHeapSizeLimit 1766 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1767 } 1768 1769 #ifdef _LP64 1770 if (UseCompressedOops) { 1771 // Limit the heap size to the maximum possible when using compressed oops 1772 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1773 1774 // HeapBaseMinAddress can be greater than default but not less than. 1775 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1776 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1777 // matches compressed oops printing flags 1778 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1779 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1780 DefaultHeapBaseMinAddress, 1781 DefaultHeapBaseMinAddress/G, 1782 HeapBaseMinAddress); 1783 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1784 } 1785 } 1786 1787 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1788 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1789 // but it should be not less than default MaxHeapSize. 1790 max_coop_heap -= HeapBaseMinAddress; 1791 } 1792 1793 // If user specified flags prioritizing os physical 1794 // memory limits, then disable compressed oops if 1795 // limits exceed max_coop_heap and UseCompressedOops 1796 // was not specified. 1797 if (reasonable_max > max_coop_heap) { 1798 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1799 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1800 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1801 "Please check the setting of MaxRAMPercentage %5.2f." 1802 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1803 FLAG_SET_ERGO(UseCompressedOops, false); 1804 FLAG_SET_ERGO(UseCompressedClassPointers, false); 1805 } else { 1806 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1807 } 1808 } 1809 } 1810 #endif // _LP64 1811 1812 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1813 1814 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1815 // An initial heap size was specified on the command line, 1816 // so be sure that the maximum size is consistent. Done 1817 // after call to limit_by_allocatable_memory because that 1818 // method might reduce the allocation size. 1819 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1820 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1821 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1822 } 1823 1824 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1825 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1826 } 1827 1828 // If the minimum or initial heap_size have not been set or requested to be set 1829 // ergonomically, set them accordingly. 1830 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1831 julong reasonable_minimum = (julong)(OldSize + NewSize); 1832 1833 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1834 1835 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1836 1837 if (InitialHeapSize == 0) { 1838 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1839 1840 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1841 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1842 1843 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1844 1845 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1846 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1847 } 1848 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1849 // synchronize with InitialHeapSize to avoid errors with the default value. 1850 if (MinHeapSize == 0) { 1851 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1852 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1853 } 1854 } 1855 } 1856 1857 // This option inspects the machine and attempts to set various 1858 // parameters to be optimal for long-running, memory allocation 1859 // intensive jobs. It is intended for machines with large 1860 // amounts of cpu and memory. 1861 jint Arguments::set_aggressive_heap_flags() { 1862 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1863 // VM, but we may not be able to represent the total physical memory 1864 // available (like having 8gb of memory on a box but using a 32bit VM). 1865 // Thus, we need to make sure we're using a julong for intermediate 1866 // calculations. 1867 julong initHeapSize; 1868 julong total_memory = os::physical_memory(); 1869 1870 if (total_memory < (julong) 256 * M) { 1871 jio_fprintf(defaultStream::error_stream(), 1872 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1873 vm_exit(1); 1874 } 1875 1876 // The heap size is half of available memory, or (at most) 1877 // all of possible memory less 160mb (leaving room for the OS 1878 // when using ISM). This is the maximum; because adaptive sizing 1879 // is turned on below, the actual space used may be smaller. 1880 1881 initHeapSize = MIN2(total_memory / (julong) 2, 1882 total_memory - (julong) 160 * M); 1883 1884 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1885 1886 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1887 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1888 return JNI_EINVAL; 1889 } 1890 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1891 return JNI_EINVAL; 1892 } 1893 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1894 return JNI_EINVAL; 1895 } 1896 } 1897 if (FLAG_IS_DEFAULT(NewSize)) { 1898 // Make the young generation 3/8ths of the total heap. 1899 if (FLAG_SET_CMDLINE(NewSize, 1900 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1901 return JNI_EINVAL; 1902 } 1903 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1904 return JNI_EINVAL; 1905 } 1906 } 1907 1908 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1909 FLAG_SET_DEFAULT(UseLargePages, true); 1910 #endif 1911 1912 // Increase some data structure sizes for efficiency 1913 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1914 return JNI_EINVAL; 1915 } 1916 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1917 return JNI_EINVAL; 1918 } 1919 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1920 return JNI_EINVAL; 1921 } 1922 1923 // See the OldPLABSize comment below, but replace 'after promotion' 1924 // with 'after copying'. YoungPLABSize is the size of the survivor 1925 // space per-gc-thread buffers. The default is 4kw. 1926 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1927 return JNI_EINVAL; 1928 } 1929 1930 // OldPLABSize is the size of the buffers in the old gen that 1931 // UseParallelGC uses to promote live data that doesn't fit in the 1932 // survivor spaces. At any given time, there's one for each gc thread. 1933 // The default size is 1kw. These buffers are rarely used, since the 1934 // survivor spaces are usually big enough. For specjbb, however, there 1935 // are occasions when there's lots of live data in the young gen 1936 // and we end up promoting some of it. We don't have a definite 1937 // explanation for why bumping OldPLABSize helps, but the theory 1938 // is that a bigger PLAB results in retaining something like the 1939 // original allocation order after promotion, which improves mutator 1940 // locality. A minor effect may be that larger PLABs reduce the 1941 // number of PLAB allocation events during gc. The value of 8kw 1942 // was arrived at by experimenting with specjbb. 1943 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1944 return JNI_EINVAL; 1945 } 1946 1947 // Enable parallel GC and adaptive generation sizing 1948 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1949 return JNI_EINVAL; 1950 } 1951 1952 // Encourage steady state memory management 1953 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1954 return JNI_EINVAL; 1955 } 1956 1957 // This appears to improve mutator locality 1958 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1959 return JNI_EINVAL; 1960 } 1961 1962 return JNI_OK; 1963 } 1964 1965 // This must be called after ergonomics. 1966 void Arguments::set_bytecode_flags() { 1967 if (!RewriteBytecodes) { 1968 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1969 } 1970 } 1971 1972 // Aggressive optimization flags 1973 jint Arguments::set_aggressive_opts_flags() { 1974 #ifdef COMPILER2 1975 if (AggressiveUnboxing) { 1976 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1977 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1978 } else if (!EliminateAutoBox) { 1979 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1980 AggressiveUnboxing = false; 1981 } 1982 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1983 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1984 } else if (!DoEscapeAnalysis) { 1985 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1986 AggressiveUnboxing = false; 1987 } 1988 } 1989 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1990 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1991 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1992 } 1993 // Feed the cache size setting into the JDK 1994 char buffer[1024]; 1995 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1996 if (!add_property(buffer)) { 1997 return JNI_ENOMEM; 1998 } 1999 } 2000 #endif 2001 2002 return JNI_OK; 2003 } 2004 2005 //=========================================================================================================== 2006 // Parsing of java.compiler property 2007 2008 void Arguments::process_java_compiler_argument(const char* arg) { 2009 // For backwards compatibility, Djava.compiler=NONE or "" 2010 // causes us to switch to -Xint mode UNLESS -Xdebug 2011 // is also specified. 2012 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2013 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2014 } 2015 } 2016 2017 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2018 _sun_java_launcher = os::strdup_check_oom(launcher); 2019 } 2020 2021 bool Arguments::created_by_java_launcher() { 2022 assert(_sun_java_launcher != NULL, "property must have value"); 2023 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2024 } 2025 2026 bool Arguments::sun_java_launcher_is_altjvm() { 2027 return _sun_java_launcher_is_altjvm; 2028 } 2029 2030 //=========================================================================================================== 2031 // Parsing of main arguments 2032 2033 unsigned int addreads_count = 0; 2034 unsigned int addexports_count = 0; 2035 unsigned int addopens_count = 0; 2036 unsigned int addmods_count = 0; 2037 unsigned int patch_mod_count = 0; 2038 2039 // Check the consistency of vm_init_args 2040 bool Arguments::check_vm_args_consistency() { 2041 // Method for adding checks for flag consistency. 2042 // The intent is to warn the user of all possible conflicts, 2043 // before returning an error. 2044 // Note: Needs platform-dependent factoring. 2045 bool status = true; 2046 2047 if (TLABRefillWasteFraction == 0) { 2048 jio_fprintf(defaultStream::error_stream(), 2049 "TLABRefillWasteFraction should be a denominator, " 2050 "not " SIZE_FORMAT "\n", 2051 TLABRefillWasteFraction); 2052 status = false; 2053 } 2054 2055 if (PrintNMTStatistics) { 2056 #if INCLUDE_NMT 2057 if (MemTracker::tracking_level() == NMT_off) { 2058 #endif // INCLUDE_NMT 2059 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2060 PrintNMTStatistics = false; 2061 #if INCLUDE_NMT 2062 } 2063 #endif 2064 } 2065 2066 status = CompilerConfig::check_args_consistency(status); 2067 #if INCLUDE_JVMCI 2068 if (status && EnableJVMCI) { 2069 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2070 AddProperty, UnwriteableProperty, InternalProperty); 2071 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2072 return false; 2073 } 2074 } 2075 #endif 2076 2077 #ifndef SUPPORT_RESERVED_STACK_AREA 2078 if (StackReservedPages != 0) { 2079 FLAG_SET_CMDLINE(StackReservedPages, 0); 2080 warning("Reserved Stack Area not supported on this platform"); 2081 } 2082 #endif 2083 2084 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2085 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2086 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2087 } 2088 } 2089 2090 status = status && GCArguments::check_args_consistency(); 2091 2092 return status; 2093 } 2094 2095 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2096 const char* option_type) { 2097 if (ignore) return false; 2098 2099 const char* spacer = " "; 2100 if (option_type == NULL) { 2101 option_type = ++spacer; // Set both to the empty string. 2102 } 2103 2104 jio_fprintf(defaultStream::error_stream(), 2105 "Unrecognized %s%soption: %s\n", option_type, spacer, 2106 option->optionString); 2107 return true; 2108 } 2109 2110 static const char* user_assertion_options[] = { 2111 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2112 }; 2113 2114 static const char* system_assertion_options[] = { 2115 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2116 }; 2117 2118 bool Arguments::parse_uintx(const char* value, 2119 uintx* uintx_arg, 2120 uintx min_size) { 2121 2122 // Check the sign first since atojulong() parses only unsigned values. 2123 bool value_is_positive = !(*value == '-'); 2124 2125 if (value_is_positive) { 2126 julong n; 2127 bool good_return = atojulong(value, &n); 2128 if (good_return) { 2129 bool above_minimum = n >= min_size; 2130 bool value_is_too_large = n > max_uintx; 2131 2132 if (above_minimum && !value_is_too_large) { 2133 *uintx_arg = n; 2134 return true; 2135 } 2136 } 2137 } 2138 return false; 2139 } 2140 2141 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2142 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2143 char* property = AllocateHeap(prop_len, mtArguments); 2144 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2145 if (ret < 0 || ret >= (int)prop_len) { 2146 FreeHeap(property); 2147 return false; 2148 } 2149 bool added = add_property(property, UnwriteableProperty, internal); 2150 FreeHeap(property); 2151 return added; 2152 } 2153 2154 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2155 const unsigned int props_count_limit = 1000; 2156 const int max_digits = 3; 2157 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2158 2159 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2160 if (count < props_count_limit) { 2161 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2162 char* property = AllocateHeap(prop_len, mtArguments); 2163 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2164 if (ret < 0 || ret >= (int)prop_len) { 2165 FreeHeap(property); 2166 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2167 return false; 2168 } 2169 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2170 FreeHeap(property); 2171 return added; 2172 } 2173 2174 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2175 return false; 2176 } 2177 2178 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2179 julong* long_arg, 2180 julong min_size, 2181 julong max_size) { 2182 if (!atojulong(s, long_arg)) return arg_unreadable; 2183 return check_memory_size(*long_arg, min_size, max_size); 2184 } 2185 2186 // Parse JavaVMInitArgs structure 2187 2188 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2189 const JavaVMInitArgs *java_options_args, 2190 const JavaVMInitArgs *cmd_line_args) { 2191 bool patch_mod_javabase = false; 2192 2193 // Save default settings for some mode flags 2194 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2195 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2196 Arguments::_ClipInlining = ClipInlining; 2197 Arguments::_BackgroundCompilation = BackgroundCompilation; 2198 if (TieredCompilation) { 2199 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2200 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2201 } 2202 2203 // Setup flags for mixed which is the default 2204 set_mode_flags(_mixed); 2205 2206 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2207 // variable (if present). 2208 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2209 if (result != JNI_OK) { 2210 return result; 2211 } 2212 2213 // Parse args structure generated from the command line flags. 2214 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE); 2215 if (result != JNI_OK) { 2216 return result; 2217 } 2218 2219 // Parse args structure generated from the _JAVA_OPTIONS environment 2220 // variable (if present) (mimics classic VM) 2221 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2222 if (result != JNI_OK) { 2223 return result; 2224 } 2225 2226 // We need to ensure processor and memory resources have been properly 2227 // configured - which may rely on arguments we just processed - before 2228 // doing the final argument processing. Any argument processing that 2229 // needs to know about processor and memory resources must occur after 2230 // this point. 2231 2232 os::init_container_support(); 2233 2234 // Do final processing now that all arguments have been parsed 2235 result = finalize_vm_init_args(patch_mod_javabase); 2236 if (result != JNI_OK) { 2237 return result; 2238 } 2239 2240 return JNI_OK; 2241 } 2242 2243 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2244 // represents a valid JDWP agent. is_path==true denotes that we 2245 // are dealing with -agentpath (case where name is a path), otherwise with 2246 // -agentlib 2247 bool valid_jdwp_agent(char *name, bool is_path) { 2248 char *_name; 2249 const char *_jdwp = "jdwp"; 2250 size_t _len_jdwp, _len_prefix; 2251 2252 if (is_path) { 2253 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2254 return false; 2255 } 2256 2257 _name++; // skip past last path separator 2258 _len_prefix = strlen(JNI_LIB_PREFIX); 2259 2260 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2261 return false; 2262 } 2263 2264 _name += _len_prefix; 2265 _len_jdwp = strlen(_jdwp); 2266 2267 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2268 _name += _len_jdwp; 2269 } 2270 else { 2271 return false; 2272 } 2273 2274 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2275 return false; 2276 } 2277 2278 return true; 2279 } 2280 2281 if (strcmp(name, _jdwp) == 0) { 2282 return true; 2283 } 2284 2285 return false; 2286 } 2287 2288 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2289 // --patch-module=<module>=<file>(<pathsep><file>)* 2290 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2291 // Find the equal sign between the module name and the path specification 2292 const char* module_equal = strchr(patch_mod_tail, '='); 2293 if (module_equal == NULL) { 2294 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2295 return JNI_ERR; 2296 } else { 2297 // Pick out the module name 2298 size_t module_len = module_equal - patch_mod_tail; 2299 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2300 if (module_name != NULL) { 2301 memcpy(module_name, patch_mod_tail, module_len); 2302 *(module_name + module_len) = '\0'; 2303 // The path piece begins one past the module_equal sign 2304 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2305 FREE_C_HEAP_ARRAY(char, module_name); 2306 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2307 return JNI_ENOMEM; 2308 } 2309 } else { 2310 return JNI_ENOMEM; 2311 } 2312 } 2313 return JNI_OK; 2314 } 2315 2316 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2317 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2318 // The min and max sizes match the values in globals.hpp, but scaled 2319 // with K. The values have been chosen so that alignment with page 2320 // size doesn't change the max value, which makes the conversions 2321 // back and forth between Xss value and ThreadStackSize value easier. 2322 // The values have also been chosen to fit inside a 32-bit signed type. 2323 const julong min_ThreadStackSize = 0; 2324 const julong max_ThreadStackSize = 1 * M; 2325 2326 const julong min_size = min_ThreadStackSize * K; 2327 const julong max_size = max_ThreadStackSize * K; 2328 2329 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2330 2331 julong size = 0; 2332 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2333 if (errcode != arg_in_range) { 2334 bool silent = (option == NULL); // Allow testing to silence error messages 2335 if (!silent) { 2336 jio_fprintf(defaultStream::error_stream(), 2337 "Invalid thread stack size: %s\n", option->optionString); 2338 describe_range_error(errcode); 2339 } 2340 return JNI_EINVAL; 2341 } 2342 2343 // Internally track ThreadStackSize in units of 1024 bytes. 2344 const julong size_aligned = align_up(size, K); 2345 assert(size <= size_aligned, 2346 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2347 size, size_aligned); 2348 2349 const julong size_in_K = size_aligned / K; 2350 assert(size_in_K < (julong)max_intx, 2351 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2352 size_in_K); 2353 2354 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2355 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2356 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2357 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2358 max_expanded, size_in_K); 2359 2360 *out_ThreadStackSize = (intx)size_in_K; 2361 2362 return JNI_OK; 2363 } 2364 2365 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) { 2366 // For match_option to return remaining or value part of option string 2367 const char* tail; 2368 2369 // iterate over arguments 2370 for (int index = 0; index < args->nOptions; index++) { 2371 bool is_absolute_path = false; // for -agentpath vs -agentlib 2372 2373 const JavaVMOption* option = args->options + index; 2374 2375 if (!match_option(option, "-Djava.class.path", &tail) && 2376 !match_option(option, "-Dsun.java.command", &tail) && 2377 !match_option(option, "-Dsun.java.launcher", &tail)) { 2378 2379 // add all jvm options to the jvm_args string. This string 2380 // is used later to set the java.vm.args PerfData string constant. 2381 // the -Djava.class.path and the -Dsun.java.command options are 2382 // omitted from jvm_args string as each have their own PerfData 2383 // string constant object. 2384 build_jvm_args(option->optionString); 2385 } 2386 2387 // -verbose:[class/module/gc/jni] 2388 if (match_option(option, "-verbose", &tail)) { 2389 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2390 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2391 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2392 } else if (!strcmp(tail, ":module")) { 2393 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2394 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2395 } else if (!strcmp(tail, ":gc")) { 2396 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2397 } else if (!strcmp(tail, ":jni")) { 2398 if (FLAG_SET_CMDLINE(PrintJNIResolving, true) != JVMFlag::SUCCESS) { 2399 return JNI_EINVAL; 2400 } 2401 } 2402 // -da / -ea / -disableassertions / -enableassertions 2403 // These accept an optional class/package name separated by a colon, e.g., 2404 // -da:java.lang.Thread. 2405 } else if (match_option(option, user_assertion_options, &tail, true)) { 2406 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2407 if (*tail == '\0') { 2408 JavaAssertions::setUserClassDefault(enable); 2409 } else { 2410 assert(*tail == ':', "bogus match by match_option()"); 2411 JavaAssertions::addOption(tail + 1, enable); 2412 } 2413 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2414 } else if (match_option(option, system_assertion_options, &tail, false)) { 2415 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2416 JavaAssertions::setSystemClassDefault(enable); 2417 // -bootclasspath: 2418 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2419 jio_fprintf(defaultStream::output_stream(), 2420 "-Xbootclasspath is no longer a supported option.\n"); 2421 return JNI_EINVAL; 2422 // -bootclasspath/a: 2423 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2424 Arguments::append_sysclasspath(tail); 2425 // -bootclasspath/p: 2426 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2427 jio_fprintf(defaultStream::output_stream(), 2428 "-Xbootclasspath/p is no longer a supported option.\n"); 2429 return JNI_EINVAL; 2430 // -Xrun 2431 } else if (match_option(option, "-Xrun", &tail)) { 2432 if (tail != NULL) { 2433 const char* pos = strchr(tail, ':'); 2434 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2435 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2436 jio_snprintf(name, len + 1, "%s", tail); 2437 2438 char *options = NULL; 2439 if(pos != NULL) { 2440 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2441 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2442 } 2443 #if !INCLUDE_JVMTI 2444 if (strcmp(name, "jdwp") == 0) { 2445 jio_fprintf(defaultStream::error_stream(), 2446 "Debugging agents are not supported in this VM\n"); 2447 return JNI_ERR; 2448 } 2449 #endif // !INCLUDE_JVMTI 2450 add_init_library(name, options); 2451 } 2452 } else if (match_option(option, "--add-reads=", &tail)) { 2453 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2454 return JNI_ENOMEM; 2455 } 2456 } else if (match_option(option, "--add-exports=", &tail)) { 2457 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2458 return JNI_ENOMEM; 2459 } 2460 } else if (match_option(option, "--add-opens=", &tail)) { 2461 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2462 return JNI_ENOMEM; 2463 } 2464 } else if (match_option(option, "--add-modules=", &tail)) { 2465 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2466 return JNI_ENOMEM; 2467 } 2468 } else if (match_option(option, "--limit-modules=", &tail)) { 2469 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2470 return JNI_ENOMEM; 2471 } 2472 } else if (match_option(option, "--module-path=", &tail)) { 2473 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2474 return JNI_ENOMEM; 2475 } 2476 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2477 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2478 return JNI_ENOMEM; 2479 } 2480 } else if (match_option(option, "--patch-module=", &tail)) { 2481 // --patch-module=<module>=<file>(<pathsep><file>)* 2482 int res = process_patch_mod_option(tail, patch_mod_javabase); 2483 if (res != JNI_OK) { 2484 return res; 2485 } 2486 } else if (match_option(option, "--illegal-access=", &tail)) { 2487 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2488 return JNI_ENOMEM; 2489 } 2490 // -agentlib and -agentpath 2491 } else if (match_option(option, "-agentlib:", &tail) || 2492 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2493 if(tail != NULL) { 2494 const char* pos = strchr(tail, '='); 2495 char* name; 2496 if (pos == NULL) { 2497 name = os::strdup_check_oom(tail, mtArguments); 2498 } else { 2499 size_t len = pos - tail; 2500 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2501 memcpy(name, tail, len); 2502 name[len] = '\0'; 2503 } 2504 2505 char *options = NULL; 2506 if(pos != NULL) { 2507 options = os::strdup_check_oom(pos + 1, mtArguments); 2508 } 2509 #if !INCLUDE_JVMTI 2510 if (valid_jdwp_agent(name, is_absolute_path)) { 2511 jio_fprintf(defaultStream::error_stream(), 2512 "Debugging agents are not supported in this VM\n"); 2513 return JNI_ERR; 2514 } 2515 #endif // !INCLUDE_JVMTI 2516 add_init_agent(name, options, is_absolute_path); 2517 } 2518 // -javaagent 2519 } else if (match_option(option, "-javaagent:", &tail)) { 2520 #if !INCLUDE_JVMTI 2521 jio_fprintf(defaultStream::error_stream(), 2522 "Instrumentation agents are not supported in this VM\n"); 2523 return JNI_ERR; 2524 #else 2525 if (tail != NULL) { 2526 size_t length = strlen(tail) + 1; 2527 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2528 jio_snprintf(options, length, "%s", tail); 2529 add_instrument_agent("instrument", options, false); 2530 // java agents need module java.instrument 2531 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2532 return JNI_ENOMEM; 2533 } 2534 } 2535 #endif // !INCLUDE_JVMTI 2536 // --enable_preview 2537 } else if (match_option(option, "--enable-preview")) { 2538 set_enable_preview(); 2539 // -Xnoclassgc 2540 } else if (match_option(option, "-Xnoclassgc")) { 2541 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2542 return JNI_EINVAL; 2543 } 2544 // -Xconcgc 2545 } else if (match_option(option, "-Xconcgc")) { 2546 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) { 2547 return JNI_EINVAL; 2548 } 2549 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2550 // -Xnoconcgc 2551 } else if (match_option(option, "-Xnoconcgc")) { 2552 if (FLAG_SET_CMDLINE(UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) { 2553 return JNI_EINVAL; 2554 } 2555 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2556 // -Xbatch 2557 } else if (match_option(option, "-Xbatch")) { 2558 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2559 return JNI_EINVAL; 2560 } 2561 // -Xmn for compatibility with other JVM vendors 2562 } else if (match_option(option, "-Xmn", &tail)) { 2563 julong long_initial_young_size = 0; 2564 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2565 if (errcode != arg_in_range) { 2566 jio_fprintf(defaultStream::error_stream(), 2567 "Invalid initial young generation size: %s\n", option->optionString); 2568 describe_range_error(errcode); 2569 return JNI_EINVAL; 2570 } 2571 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2572 return JNI_EINVAL; 2573 } 2574 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2575 return JNI_EINVAL; 2576 } 2577 // -Xms 2578 } else if (match_option(option, "-Xms", &tail)) { 2579 julong size = 0; 2580 // an initial heap size of 0 means automatically determine 2581 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2582 if (errcode != arg_in_range) { 2583 jio_fprintf(defaultStream::error_stream(), 2584 "Invalid initial heap size: %s\n", option->optionString); 2585 describe_range_error(errcode); 2586 return JNI_EINVAL; 2587 } 2588 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2589 return JNI_EINVAL; 2590 } 2591 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2592 return JNI_EINVAL; 2593 } 2594 // -Xmx 2595 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2596 julong long_max_heap_size = 0; 2597 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2598 if (errcode != arg_in_range) { 2599 jio_fprintf(defaultStream::error_stream(), 2600 "Invalid maximum heap size: %s\n", option->optionString); 2601 describe_range_error(errcode); 2602 return JNI_EINVAL; 2603 } 2604 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2605 return JNI_EINVAL; 2606 } 2607 // Xmaxf 2608 } else if (match_option(option, "-Xmaxf", &tail)) { 2609 char* err; 2610 int maxf = (int)(strtod(tail, &err) * 100); 2611 if (*err != '\0' || *tail == '\0') { 2612 jio_fprintf(defaultStream::error_stream(), 2613 "Bad max heap free percentage size: %s\n", 2614 option->optionString); 2615 return JNI_EINVAL; 2616 } else { 2617 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2618 return JNI_EINVAL; 2619 } 2620 } 2621 // Xminf 2622 } else if (match_option(option, "-Xminf", &tail)) { 2623 char* err; 2624 int minf = (int)(strtod(tail, &err) * 100); 2625 if (*err != '\0' || *tail == '\0') { 2626 jio_fprintf(defaultStream::error_stream(), 2627 "Bad min heap free percentage size: %s\n", 2628 option->optionString); 2629 return JNI_EINVAL; 2630 } else { 2631 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2632 return JNI_EINVAL; 2633 } 2634 } 2635 // -Xss 2636 } else if (match_option(option, "-Xss", &tail)) { 2637 intx value = 0; 2638 jint err = parse_xss(option, tail, &value); 2639 if (err != JNI_OK) { 2640 return err; 2641 } 2642 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2643 return JNI_EINVAL; 2644 } 2645 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2646 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2647 julong long_ReservedCodeCacheSize = 0; 2648 2649 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2650 if (errcode != arg_in_range) { 2651 jio_fprintf(defaultStream::error_stream(), 2652 "Invalid maximum code cache size: %s.\n", option->optionString); 2653 return JNI_EINVAL; 2654 } 2655 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2656 return JNI_EINVAL; 2657 } 2658 // -green 2659 } else if (match_option(option, "-green")) { 2660 jio_fprintf(defaultStream::error_stream(), 2661 "Green threads support not available\n"); 2662 return JNI_EINVAL; 2663 // -native 2664 } else if (match_option(option, "-native")) { 2665 // HotSpot always uses native threads, ignore silently for compatibility 2666 // -Xrs 2667 } else if (match_option(option, "-Xrs")) { 2668 // Classic/EVM option, new functionality 2669 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2670 return JNI_EINVAL; 2671 } 2672 // -Xprof 2673 } else if (match_option(option, "-Xprof")) { 2674 char version[256]; 2675 // Obsolete in JDK 10 2676 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2677 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2678 // -Xinternalversion 2679 } else if (match_option(option, "-Xinternalversion")) { 2680 jio_fprintf(defaultStream::output_stream(), "%s\n", 2681 VM_Version::internal_vm_info_string()); 2682 vm_exit(0); 2683 #ifndef PRODUCT 2684 // -Xprintflags 2685 } else if (match_option(option, "-Xprintflags")) { 2686 JVMFlag::printFlags(tty, false); 2687 vm_exit(0); 2688 #endif 2689 // -D 2690 } else if (match_option(option, "-D", &tail)) { 2691 const char* value; 2692 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2693 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2694 // abort if -Djava.endorsed.dirs is set 2695 jio_fprintf(defaultStream::output_stream(), 2696 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2697 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2698 return JNI_EINVAL; 2699 } 2700 if (match_option(option, "-Djava.ext.dirs=", &value) && 2701 *value != '\0' && strcmp(value, "\"\"") != 0) { 2702 // abort if -Djava.ext.dirs is set 2703 jio_fprintf(defaultStream::output_stream(), 2704 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2705 return JNI_EINVAL; 2706 } 2707 // Check for module related properties. They must be set using the modules 2708 // options. For example: use "--add-modules=java.sql", not 2709 // "-Djdk.module.addmods=java.sql" 2710 if (is_internal_module_property(option->optionString + 2)) { 2711 needs_module_property_warning = true; 2712 continue; 2713 } 2714 2715 if (!add_property(tail)) { 2716 return JNI_ENOMEM; 2717 } 2718 // Out of the box management support 2719 if (match_option(option, "-Dcom.sun.management", &tail)) { 2720 #if INCLUDE_MANAGEMENT 2721 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2722 return JNI_EINVAL; 2723 } 2724 // management agent in module jdk.management.agent 2725 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2726 return JNI_ENOMEM; 2727 } 2728 #else 2729 jio_fprintf(defaultStream::output_stream(), 2730 "-Dcom.sun.management is not supported in this VM.\n"); 2731 return JNI_ERR; 2732 #endif 2733 } 2734 // -Xint 2735 } else if (match_option(option, "-Xint")) { 2736 set_mode_flags(_int); 2737 // -Xmixed 2738 } else if (match_option(option, "-Xmixed")) { 2739 set_mode_flags(_mixed); 2740 // -Xcomp 2741 } else if (match_option(option, "-Xcomp")) { 2742 // for testing the compiler; turn off all flags that inhibit compilation 2743 set_mode_flags(_comp); 2744 // -Xshare:dump 2745 } else if (match_option(option, "-Xshare:dump")) { 2746 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) { 2747 return JNI_EINVAL; 2748 } 2749 // -Xshare:on 2750 } else if (match_option(option, "-Xshare:on")) { 2751 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2752 return JNI_EINVAL; 2753 } 2754 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2755 return JNI_EINVAL; 2756 } 2757 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2758 } else if (match_option(option, "-Xshare:auto")) { 2759 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2760 return JNI_EINVAL; 2761 } 2762 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2763 return JNI_EINVAL; 2764 } 2765 // -Xshare:off 2766 } else if (match_option(option, "-Xshare:off")) { 2767 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) { 2768 return JNI_EINVAL; 2769 } 2770 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2771 return JNI_EINVAL; 2772 } 2773 // -Xverify 2774 } else if (match_option(option, "-Xverify", &tail)) { 2775 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2776 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2777 return JNI_EINVAL; 2778 } 2779 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2780 return JNI_EINVAL; 2781 } 2782 } else if (strcmp(tail, ":remote") == 0) { 2783 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2784 return JNI_EINVAL; 2785 } 2786 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2787 return JNI_EINVAL; 2788 } 2789 } else if (strcmp(tail, ":none") == 0) { 2790 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2791 return JNI_EINVAL; 2792 } 2793 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2794 return JNI_EINVAL; 2795 } 2796 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2797 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2798 return JNI_EINVAL; 2799 } 2800 // -Xdebug 2801 } else if (match_option(option, "-Xdebug")) { 2802 // note this flag has been used, then ignore 2803 set_xdebug_mode(true); 2804 // -Xnoagent 2805 } else if (match_option(option, "-Xnoagent")) { 2806 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2807 } else if (match_option(option, "-Xloggc:", &tail)) { 2808 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2809 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2810 _gc_log_filename = os::strdup_check_oom(tail); 2811 } else if (match_option(option, "-Xlog", &tail)) { 2812 bool ret = false; 2813 if (strcmp(tail, ":help") == 0) { 2814 fileStream stream(defaultStream::output_stream()); 2815 LogConfiguration::print_command_line_help(&stream); 2816 vm_exit(0); 2817 } else if (strcmp(tail, ":disable") == 0) { 2818 LogConfiguration::disable_logging(); 2819 ret = true; 2820 } else if (*tail == '\0') { 2821 ret = LogConfiguration::parse_command_line_arguments(); 2822 assert(ret, "-Xlog without arguments should never fail to parse"); 2823 } else if (*tail == ':') { 2824 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2825 } 2826 if (ret == false) { 2827 jio_fprintf(defaultStream::error_stream(), 2828 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2829 tail); 2830 return JNI_EINVAL; 2831 } 2832 // JNI hooks 2833 } else if (match_option(option, "-Xcheck", &tail)) { 2834 if (!strcmp(tail, ":jni")) { 2835 #if !INCLUDE_JNI_CHECK 2836 warning("JNI CHECKING is not supported in this VM"); 2837 #else 2838 CheckJNICalls = true; 2839 #endif // INCLUDE_JNI_CHECK 2840 } else if (is_bad_option(option, args->ignoreUnrecognized, 2841 "check")) { 2842 return JNI_EINVAL; 2843 } 2844 } else if (match_option(option, "vfprintf")) { 2845 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2846 } else if (match_option(option, "exit")) { 2847 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2848 } else if (match_option(option, "abort")) { 2849 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2850 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2851 // and the last option wins. 2852 } else if (match_option(option, "-XX:+NeverTenure")) { 2853 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2854 return JNI_EINVAL; 2855 } 2856 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2857 return JNI_EINVAL; 2858 } 2859 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2860 return JNI_EINVAL; 2861 } 2862 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2863 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2864 return JNI_EINVAL; 2865 } 2866 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2867 return JNI_EINVAL; 2868 } 2869 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2870 return JNI_EINVAL; 2871 } 2872 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2873 uintx max_tenuring_thresh = 0; 2874 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2875 jio_fprintf(defaultStream::error_stream(), 2876 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2877 return JNI_EINVAL; 2878 } 2879 2880 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2881 return JNI_EINVAL; 2882 } 2883 2884 if (MaxTenuringThreshold == 0) { 2885 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2886 return JNI_EINVAL; 2887 } 2888 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2889 return JNI_EINVAL; 2890 } 2891 } else { 2892 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2893 return JNI_EINVAL; 2894 } 2895 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2896 return JNI_EINVAL; 2897 } 2898 } 2899 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2900 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2901 return JNI_EINVAL; 2902 } 2903 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2904 return JNI_EINVAL; 2905 } 2906 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2907 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2908 return JNI_EINVAL; 2909 } 2910 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2911 return JNI_EINVAL; 2912 } 2913 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2914 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2915 return JNI_EINVAL; 2916 } 2917 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2918 return JNI_EINVAL; 2919 } 2920 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2921 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2922 return JNI_EINVAL; 2923 } 2924 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2925 return JNI_EINVAL; 2926 } 2927 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 2928 #if defined(DTRACE_ENABLED) 2929 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 2930 return JNI_EINVAL; 2931 } 2932 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 2933 return JNI_EINVAL; 2934 } 2935 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 2936 return JNI_EINVAL; 2937 } 2938 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 2939 return JNI_EINVAL; 2940 } 2941 #else // defined(DTRACE_ENABLED) 2942 jio_fprintf(defaultStream::error_stream(), 2943 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2944 return JNI_EINVAL; 2945 #endif // defined(DTRACE_ENABLED) 2946 #ifdef ASSERT 2947 } else if (match_option(option, "-XX:+FullGCALot")) { 2948 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2949 return JNI_EINVAL; 2950 } 2951 // disable scavenge before parallel mark-compact 2952 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2953 return JNI_EINVAL; 2954 } 2955 #endif 2956 #if !INCLUDE_MANAGEMENT 2957 } else if (match_option(option, "-XX:+ManagementServer")) { 2958 jio_fprintf(defaultStream::error_stream(), 2959 "ManagementServer is not supported in this VM.\n"); 2960 return JNI_ERR; 2961 #endif // INCLUDE_MANAGEMENT 2962 #if INCLUDE_JFR 2963 } else if (match_jfr_option(&option)) { 2964 return JNI_EINVAL; 2965 #endif 2966 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2967 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2968 // already been handled 2969 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2970 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2971 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2972 return JNI_EINVAL; 2973 } 2974 } 2975 // Unknown option 2976 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2977 return JNI_ERR; 2978 } 2979 } 2980 2981 // PrintSharedArchiveAndExit will turn on 2982 // -Xshare:on 2983 // -Xlog:class+path=info 2984 if (PrintSharedArchiveAndExit) { 2985 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2986 return JNI_EINVAL; 2987 } 2988 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2989 return JNI_EINVAL; 2990 } 2991 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2992 } 2993 2994 fix_appclasspath(); 2995 2996 return JNI_OK; 2997 } 2998 2999 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3000 // For java.base check for duplicate --patch-module options being specified on the command line. 3001 // This check is only required for java.base, all other duplicate module specifications 3002 // will be checked during module system initialization. The module system initialization 3003 // will throw an ExceptionInInitializerError if this situation occurs. 3004 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3005 if (*patch_mod_javabase) { 3006 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3007 } else { 3008 *patch_mod_javabase = true; 3009 } 3010 } 3011 3012 // Create GrowableArray lazily, only if --patch-module has been specified 3013 if (_patch_mod_prefix == NULL) { 3014 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3015 } 3016 3017 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3018 } 3019 3020 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3021 // 3022 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3023 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3024 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3025 // path is treated as the current directory. 3026 // 3027 // This causes problems with CDS, which requires that all directories specified in the classpath 3028 // must be empty. In most cases, applications do NOT want to load classes from the current 3029 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3030 // scripts compatible with CDS. 3031 void Arguments::fix_appclasspath() { 3032 if (IgnoreEmptyClassPaths) { 3033 const char separator = *os::path_separator(); 3034 const char* src = _java_class_path->value(); 3035 3036 // skip over all the leading empty paths 3037 while (*src == separator) { 3038 src ++; 3039 } 3040 3041 char* copy = os::strdup_check_oom(src, mtArguments); 3042 3043 // trim all trailing empty paths 3044 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3045 *tail = '\0'; 3046 } 3047 3048 char from[3] = {separator, separator, '\0'}; 3049 char to [2] = {separator, '\0'}; 3050 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3051 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3052 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3053 } 3054 3055 _java_class_path->set_writeable_value(copy); 3056 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3057 } 3058 } 3059 3060 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3061 // check if the default lib/endorsed directory exists; if so, error 3062 char path[JVM_MAXPATHLEN]; 3063 const char* fileSep = os::file_separator(); 3064 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3065 3066 DIR* dir = os::opendir(path); 3067 if (dir != NULL) { 3068 jio_fprintf(defaultStream::output_stream(), 3069 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3070 "in modular form will be supported via the concept of upgradeable modules.\n"); 3071 os::closedir(dir); 3072 return JNI_ERR; 3073 } 3074 3075 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3076 dir = os::opendir(path); 3077 if (dir != NULL) { 3078 jio_fprintf(defaultStream::output_stream(), 3079 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3080 "Use -classpath instead.\n."); 3081 os::closedir(dir); 3082 return JNI_ERR; 3083 } 3084 3085 // This must be done after all arguments have been processed 3086 // and the container support has been initialized since AggressiveHeap 3087 // relies on the amount of total memory available. 3088 if (AggressiveHeap) { 3089 jint result = set_aggressive_heap_flags(); 3090 if (result != JNI_OK) { 3091 return result; 3092 } 3093 } 3094 3095 // This must be done after all arguments have been processed. 3096 // java_compiler() true means set to "NONE" or empty. 3097 if (java_compiler() && !xdebug_mode()) { 3098 // For backwards compatibility, we switch to interpreted mode if 3099 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3100 // not specified. 3101 set_mode_flags(_int); 3102 } 3103 3104 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3105 // but like -Xint, leave compilation thresholds unaffected. 3106 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3107 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3108 set_mode_flags(_int); 3109 } 3110 3111 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3112 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3113 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3114 } 3115 3116 #if !COMPILER2_OR_JVMCI 3117 // Don't degrade server performance for footprint 3118 if (FLAG_IS_DEFAULT(UseLargePages) && 3119 MaxHeapSize < LargePageHeapSizeThreshold) { 3120 // No need for large granularity pages w/small heaps. 3121 // Note that large pages are enabled/disabled for both the 3122 // Java heap and the code cache. 3123 FLAG_SET_DEFAULT(UseLargePages, false); 3124 } 3125 3126 UNSUPPORTED_OPTION(ProfileInterpreter); 3127 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3128 #endif 3129 3130 #ifndef TIERED 3131 // Tiered compilation is undefined. 3132 UNSUPPORTED_OPTION(TieredCompilation); 3133 #endif 3134 3135 if (!check_vm_args_consistency()) { 3136 return JNI_ERR; 3137 } 3138 3139 #if INCLUDE_CDS 3140 if (DumpSharedSpaces) { 3141 // Disable biased locking now as it interferes with the clean up of 3142 // the archived Klasses and Java string objects (at dump time only). 3143 UseBiasedLocking = false; 3144 3145 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3146 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable 3147 // compiler just to be safe. 3148 // 3149 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata 3150 // instead of modifying them in place. The copy is inaccessible to the compiler. 3151 // TODO: revisit the following for the static archive case. 3152 set_mode_flags(_int); 3153 } 3154 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) { 3155 // Always verify non-system classes during CDS dump 3156 if (!BytecodeVerificationRemote) { 3157 BytecodeVerificationRemote = true; 3158 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3159 } 3160 } 3161 if (ArchiveClassesAtExit == NULL) { 3162 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false); 3163 } 3164 if (UseSharedSpaces && patch_mod_javabase) { 3165 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3166 } 3167 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3168 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3169 } 3170 #endif 3171 3172 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3173 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3174 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3175 3176 return JNI_OK; 3177 } 3178 3179 // Helper class for controlling the lifetime of JavaVMInitArgs 3180 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3181 // deleted on the destruction of the ScopedVMInitArgs object. 3182 class ScopedVMInitArgs : public StackObj { 3183 private: 3184 JavaVMInitArgs _args; 3185 char* _container_name; 3186 bool _is_set; 3187 char* _vm_options_file_arg; 3188 3189 public: 3190 ScopedVMInitArgs(const char *container_name) { 3191 _args.version = JNI_VERSION_1_2; 3192 _args.nOptions = 0; 3193 _args.options = NULL; 3194 _args.ignoreUnrecognized = false; 3195 _container_name = (char *)container_name; 3196 _is_set = false; 3197 _vm_options_file_arg = NULL; 3198 } 3199 3200 // Populates the JavaVMInitArgs object represented by this 3201 // ScopedVMInitArgs object with the arguments in options. The 3202 // allocated memory is deleted by the destructor. If this method 3203 // returns anything other than JNI_OK, then this object is in a 3204 // partially constructed state, and should be abandoned. 3205 jint set_args(GrowableArray<JavaVMOption>* options) { 3206 _is_set = true; 3207 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3208 JavaVMOption, options->length(), mtArguments); 3209 if (options_arr == NULL) { 3210 return JNI_ENOMEM; 3211 } 3212 _args.options = options_arr; 3213 3214 for (int i = 0; i < options->length(); i++) { 3215 options_arr[i] = options->at(i); 3216 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3217 if (options_arr[i].optionString == NULL) { 3218 // Rely on the destructor to do cleanup. 3219 _args.nOptions = i; 3220 return JNI_ENOMEM; 3221 } 3222 } 3223 3224 _args.nOptions = options->length(); 3225 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3226 return JNI_OK; 3227 } 3228 3229 JavaVMInitArgs* get() { return &_args; } 3230 char* container_name() { return _container_name; } 3231 bool is_set() { return _is_set; } 3232 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3233 char* vm_options_file_arg() { return _vm_options_file_arg; } 3234 3235 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3236 if (_vm_options_file_arg != NULL) { 3237 os::free(_vm_options_file_arg); 3238 } 3239 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3240 } 3241 3242 ~ScopedVMInitArgs() { 3243 if (_vm_options_file_arg != NULL) { 3244 os::free(_vm_options_file_arg); 3245 } 3246 if (_args.options == NULL) return; 3247 for (int i = 0; i < _args.nOptions; i++) { 3248 os::free(_args.options[i].optionString); 3249 } 3250 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3251 } 3252 3253 // Insert options into this option list, to replace option at 3254 // vm_options_file_pos (-XX:VMOptionsFile) 3255 jint insert(const JavaVMInitArgs* args, 3256 const JavaVMInitArgs* args_to_insert, 3257 const int vm_options_file_pos) { 3258 assert(_args.options == NULL, "shouldn't be set yet"); 3259 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3260 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3261 3262 int length = args->nOptions + args_to_insert->nOptions - 1; 3263 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3264 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3265 for (int i = 0; i < args->nOptions; i++) { 3266 if (i == vm_options_file_pos) { 3267 // insert the new options starting at the same place as the 3268 // -XX:VMOptionsFile option 3269 for (int j = 0; j < args_to_insert->nOptions; j++) { 3270 options->push(args_to_insert->options[j]); 3271 } 3272 } else { 3273 options->push(args->options[i]); 3274 } 3275 } 3276 // make into options array 3277 jint result = set_args(options); 3278 delete options; 3279 return result; 3280 } 3281 }; 3282 3283 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3284 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3285 } 3286 3287 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3288 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3289 } 3290 3291 jint Arguments::parse_options_environment_variable(const char* name, 3292 ScopedVMInitArgs* vm_args) { 3293 char *buffer = ::getenv(name); 3294 3295 // Don't check this environment variable if user has special privileges 3296 // (e.g. unix su command). 3297 if (buffer == NULL || os::have_special_privileges()) { 3298 return JNI_OK; 3299 } 3300 3301 if ((buffer = os::strdup(buffer)) == NULL) { 3302 return JNI_ENOMEM; 3303 } 3304 3305 jio_fprintf(defaultStream::error_stream(), 3306 "Picked up %s: %s\n", name, buffer); 3307 3308 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3309 3310 os::free(buffer); 3311 return retcode; 3312 } 3313 3314 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3315 // read file into buffer 3316 int fd = ::open(file_name, O_RDONLY); 3317 if (fd < 0) { 3318 jio_fprintf(defaultStream::error_stream(), 3319 "Could not open options file '%s'\n", 3320 file_name); 3321 return JNI_ERR; 3322 } 3323 3324 struct stat stbuf; 3325 int retcode = os::stat(file_name, &stbuf); 3326 if (retcode != 0) { 3327 jio_fprintf(defaultStream::error_stream(), 3328 "Could not stat options file '%s'\n", 3329 file_name); 3330 os::close(fd); 3331 return JNI_ERR; 3332 } 3333 3334 if (stbuf.st_size == 0) { 3335 // tell caller there is no option data and that is ok 3336 os::close(fd); 3337 return JNI_OK; 3338 } 3339 3340 // '+ 1' for NULL termination even with max bytes 3341 size_t bytes_alloc = stbuf.st_size + 1; 3342 3343 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3344 if (NULL == buf) { 3345 jio_fprintf(defaultStream::error_stream(), 3346 "Could not allocate read buffer for options file parse\n"); 3347 os::close(fd); 3348 return JNI_ENOMEM; 3349 } 3350 3351 memset(buf, 0, bytes_alloc); 3352 3353 // Fill buffer 3354 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc); 3355 os::close(fd); 3356 if (bytes_read < 0) { 3357 FREE_C_HEAP_ARRAY(char, buf); 3358 jio_fprintf(defaultStream::error_stream(), 3359 "Could not read options file '%s'\n", file_name); 3360 return JNI_ERR; 3361 } 3362 3363 if (bytes_read == 0) { 3364 // tell caller there is no option data and that is ok 3365 FREE_C_HEAP_ARRAY(char, buf); 3366 return JNI_OK; 3367 } 3368 3369 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3370 3371 FREE_C_HEAP_ARRAY(char, buf); 3372 return retcode; 3373 } 3374 3375 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3376 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3377 3378 // some pointers to help with parsing 3379 char *buffer_end = buffer + buf_len; 3380 char *opt_hd = buffer; 3381 char *wrt = buffer; 3382 char *rd = buffer; 3383 3384 // parse all options 3385 while (rd < buffer_end) { 3386 // skip leading white space from the input string 3387 while (rd < buffer_end && isspace(*rd)) { 3388 rd++; 3389 } 3390 3391 if (rd >= buffer_end) { 3392 break; 3393 } 3394 3395 // Remember this is where we found the head of the token. 3396 opt_hd = wrt; 3397 3398 // Tokens are strings of non white space characters separated 3399 // by one or more white spaces. 3400 while (rd < buffer_end && !isspace(*rd)) { 3401 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3402 int quote = *rd; // matching quote to look for 3403 rd++; // don't copy open quote 3404 while (rd < buffer_end && *rd != quote) { 3405 // include everything (even spaces) 3406 // up until the close quote 3407 *wrt++ = *rd++; // copy to option string 3408 } 3409 3410 if (rd < buffer_end) { 3411 rd++; // don't copy close quote 3412 } else { 3413 // did not see closing quote 3414 jio_fprintf(defaultStream::error_stream(), 3415 "Unmatched quote in %s\n", name); 3416 delete options; 3417 return JNI_ERR; 3418 } 3419 } else { 3420 *wrt++ = *rd++; // copy to option string 3421 } 3422 } 3423 3424 // steal a white space character and set it to NULL 3425 *wrt++ = '\0'; 3426 // We now have a complete token 3427 3428 JavaVMOption option; 3429 option.optionString = opt_hd; 3430 option.extraInfo = NULL; 3431 3432 options->append(option); // Fill in option 3433 3434 rd++; // Advance to next character 3435 } 3436 3437 // Fill out JavaVMInitArgs structure. 3438 jint status = vm_args->set_args(options); 3439 3440 delete options; 3441 return status; 3442 } 3443 3444 void Arguments::set_shared_spaces_flags() { 3445 if (DumpSharedSpaces) { 3446 if (RequireSharedSpaces) { 3447 warning("Cannot dump shared archive while using shared archive"); 3448 } 3449 UseSharedSpaces = false; 3450 #ifdef _LP64 3451 if (!UseCompressedOops || !UseCompressedClassPointers) { 3452 vm_exit_during_initialization( 3453 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3454 } 3455 } else { 3456 if (!UseCompressedOops || !UseCompressedClassPointers) { 3457 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3458 } 3459 #endif 3460 } 3461 } 3462 3463 #if INCLUDE_CDS 3464 // Sharing support 3465 // Construct the path to the archive 3466 char* Arguments::get_default_shared_archive_path() { 3467 char *default_archive_path; 3468 char jvm_path[JVM_MAXPATHLEN]; 3469 os::jvm_path(jvm_path, sizeof(jvm_path)); 3470 char *end = strrchr(jvm_path, *os::file_separator()); 3471 if (end != NULL) *end = '\0'; 3472 size_t jvm_path_len = strlen(jvm_path); 3473 size_t file_sep_len = strlen(os::file_separator()); 3474 const size_t len = jvm_path_len + file_sep_len + 20; 3475 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3476 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa", 3477 jvm_path, os::file_separator()); 3478 return default_archive_path; 3479 } 3480 3481 int Arguments::num_archives(const char* archive_path) { 3482 if (archive_path == NULL) { 3483 return 0; 3484 } 3485 int npaths = 1; 3486 char* p = (char*)archive_path; 3487 while (*p != '\0') { 3488 if (*p == os::path_separator()[0]) { 3489 npaths++; 3490 } 3491 p++; 3492 } 3493 return npaths; 3494 } 3495 3496 void Arguments::extract_shared_archive_paths(const char* archive_path, 3497 char** base_archive_path, 3498 char** top_archive_path) { 3499 char* begin_ptr = (char*)archive_path; 3500 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3501 if (end_ptr == NULL || end_ptr == begin_ptr) { 3502 vm_exit_during_initialization("Base archive was not specified", archive_path); 3503 } 3504 size_t len = end_ptr - begin_ptr; 3505 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3506 strncpy(cur_path, begin_ptr, len); 3507 cur_path[len] = '\0'; 3508 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/); 3509 *base_archive_path = cur_path; 3510 3511 begin_ptr = ++end_ptr; 3512 if (*begin_ptr == '\0') { 3513 vm_exit_during_initialization("Top archive was not specified", archive_path); 3514 } 3515 end_ptr = strchr(begin_ptr, '\0'); 3516 assert(end_ptr != NULL, "sanity"); 3517 len = end_ptr - begin_ptr; 3518 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3519 strncpy(cur_path, begin_ptr, len + 1); 3520 //cur_path[len] = '\0'; 3521 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/); 3522 *top_archive_path = cur_path; 3523 } 3524 3525 bool Arguments::init_shared_archive_paths() { 3526 if (ArchiveClassesAtExit != NULL) { 3527 if (DumpSharedSpaces) { 3528 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3529 } 3530 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) { 3531 return false; 3532 } 3533 check_unsupported_dumping_properties(); 3534 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments); 3535 } 3536 if (SharedArchiveFile == NULL) { 3537 SharedArchivePath = get_default_shared_archive_path(); 3538 } else { 3539 int archives = num_archives(SharedArchiveFile); 3540 if (is_dumping_archive()) { 3541 if (archives > 1) { 3542 vm_exit_during_initialization( 3543 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3544 } 3545 if (DynamicDumpSharedSpaces) { 3546 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3547 vm_exit_during_initialization( 3548 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3549 SharedArchiveFile); 3550 } 3551 } 3552 } 3553 if (!is_dumping_archive()){ 3554 if (archives > 2) { 3555 vm_exit_during_initialization( 3556 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3557 } 3558 if (archives == 1) { 3559 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3560 int name_size; 3561 bool success = 3562 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath); 3563 if (!success) { 3564 SharedArchivePath = temp_archive_path; 3565 } else { 3566 SharedDynamicArchivePath = temp_archive_path; 3567 } 3568 } else { 3569 extract_shared_archive_paths((const char*)SharedArchiveFile, 3570 &SharedArchivePath, &SharedDynamicArchivePath); 3571 } 3572 } else { // CDS dumping 3573 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3574 } 3575 } 3576 return (SharedArchivePath != NULL); 3577 } 3578 #endif // INCLUDE_CDS 3579 3580 #ifndef PRODUCT 3581 // Determine whether LogVMOutput should be implicitly turned on. 3582 static bool use_vm_log() { 3583 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3584 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3585 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3586 PrintAssembly || TraceDeoptimization || TraceDependencies || 3587 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3588 return true; 3589 } 3590 3591 #ifdef COMPILER1 3592 if (PrintC1Statistics) { 3593 return true; 3594 } 3595 #endif // COMPILER1 3596 3597 #ifdef COMPILER2 3598 if (PrintOptoAssembly || PrintOptoStatistics) { 3599 return true; 3600 } 3601 #endif // COMPILER2 3602 3603 return false; 3604 } 3605 3606 #endif // PRODUCT 3607 3608 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3609 for (int index = 0; index < args->nOptions; index++) { 3610 const JavaVMOption* option = args->options + index; 3611 const char* tail; 3612 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3613 return true; 3614 } 3615 } 3616 return false; 3617 } 3618 3619 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3620 const char* vm_options_file, 3621 const int vm_options_file_pos, 3622 ScopedVMInitArgs* vm_options_file_args, 3623 ScopedVMInitArgs* args_out) { 3624 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3625 if (code != JNI_OK) { 3626 return code; 3627 } 3628 3629 if (vm_options_file_args->get()->nOptions < 1) { 3630 return JNI_OK; 3631 } 3632 3633 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3634 jio_fprintf(defaultStream::error_stream(), 3635 "A VM options file may not refer to a VM options file. " 3636 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3637 "options file '%s' in options container '%s' is an error.\n", 3638 vm_options_file_args->vm_options_file_arg(), 3639 vm_options_file_args->container_name()); 3640 return JNI_EINVAL; 3641 } 3642 3643 return args_out->insert(args, vm_options_file_args->get(), 3644 vm_options_file_pos); 3645 } 3646 3647 // Expand -XX:VMOptionsFile found in args_in as needed. 3648 // mod_args and args_out parameters may return values as needed. 3649 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3650 ScopedVMInitArgs* mod_args, 3651 JavaVMInitArgs** args_out) { 3652 jint code = match_special_option_and_act(args_in, mod_args); 3653 if (code != JNI_OK) { 3654 return code; 3655 } 3656 3657 if (mod_args->is_set()) { 3658 // args_in contains -XX:VMOptionsFile and mod_args contains the 3659 // original options from args_in along with the options expanded 3660 // from the VMOptionsFile. Return a short-hand to the caller. 3661 *args_out = mod_args->get(); 3662 } else { 3663 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3664 } 3665 return JNI_OK; 3666 } 3667 3668 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3669 ScopedVMInitArgs* args_out) { 3670 // Remaining part of option string 3671 const char* tail; 3672 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3673 3674 for (int index = 0; index < args->nOptions; index++) { 3675 const JavaVMOption* option = args->options + index; 3676 if (match_option(option, "-XX:Flags=", &tail)) { 3677 Arguments::set_jvm_flags_file(tail); 3678 continue; 3679 } 3680 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3681 if (vm_options_file_args.found_vm_options_file_arg()) { 3682 jio_fprintf(defaultStream::error_stream(), 3683 "The option '%s' is already specified in the options " 3684 "container '%s' so the specification of '%s' in the " 3685 "same options container is an error.\n", 3686 vm_options_file_args.vm_options_file_arg(), 3687 vm_options_file_args.container_name(), 3688 option->optionString); 3689 return JNI_EINVAL; 3690 } 3691 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3692 // If there's a VMOptionsFile, parse that 3693 jint code = insert_vm_options_file(args, tail, index, 3694 &vm_options_file_args, args_out); 3695 if (code != JNI_OK) { 3696 return code; 3697 } 3698 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3699 if (args_out->is_set()) { 3700 // The VMOptions file inserted some options so switch 'args' 3701 // to the new set of options, and continue processing which 3702 // preserves "last option wins" semantics. 3703 args = args_out->get(); 3704 // The first option from the VMOptionsFile replaces the 3705 // current option. So we back track to process the 3706 // replacement option. 3707 index--; 3708 } 3709 continue; 3710 } 3711 if (match_option(option, "-XX:+PrintVMOptions")) { 3712 PrintVMOptions = true; 3713 continue; 3714 } 3715 if (match_option(option, "-XX:-PrintVMOptions")) { 3716 PrintVMOptions = false; 3717 continue; 3718 } 3719 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3720 IgnoreUnrecognizedVMOptions = true; 3721 continue; 3722 } 3723 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3724 IgnoreUnrecognizedVMOptions = false; 3725 continue; 3726 } 3727 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3728 JVMFlag::printFlags(tty, false); 3729 vm_exit(0); 3730 } 3731 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3732 #if INCLUDE_NMT 3733 // The launcher did not setup nmt environment variable properly. 3734 if (!MemTracker::check_launcher_nmt_support(tail)) { 3735 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3736 } 3737 3738 // Verify if nmt option is valid. 3739 if (MemTracker::verify_nmt_option()) { 3740 // Late initialization, still in single-threaded mode. 3741 if (MemTracker::tracking_level() >= NMT_summary) { 3742 MemTracker::init(); 3743 } 3744 } else { 3745 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3746 } 3747 continue; 3748 #else 3749 jio_fprintf(defaultStream::error_stream(), 3750 "Native Memory Tracking is not supported in this VM\n"); 3751 return JNI_ERR; 3752 #endif 3753 } 3754 3755 #ifndef PRODUCT 3756 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3757 JVMFlag::printFlags(tty, true); 3758 vm_exit(0); 3759 } 3760 #endif 3761 } 3762 return JNI_OK; 3763 } 3764 3765 static void print_options(const JavaVMInitArgs *args) { 3766 const char* tail; 3767 for (int index = 0; index < args->nOptions; index++) { 3768 const JavaVMOption *option = args->options + index; 3769 if (match_option(option, "-XX:", &tail)) { 3770 logOption(tail); 3771 } 3772 } 3773 } 3774 3775 bool Arguments::handle_deprecated_print_gc_flags() { 3776 if (PrintGC) { 3777 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3778 } 3779 if (PrintGCDetails) { 3780 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3781 } 3782 3783 if (_gc_log_filename != NULL) { 3784 // -Xloggc was used to specify a filename 3785 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3786 3787 LogTarget(Error, logging) target; 3788 LogStream errstream(target); 3789 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 3790 } else if (PrintGC || PrintGCDetails) { 3791 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3792 } 3793 return true; 3794 } 3795 3796 void Arguments::handle_extra_cms_flags(const char* msg) { 3797 SpecialFlag flag; 3798 const char *flag_name = "UseConcMarkSweepGC"; 3799 if (lookup_special_flag(flag_name, flag)) { 3800 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 3801 warning("%s", msg); 3802 } 3803 } 3804 3805 // Parse entry point called from JNI_CreateJavaVM 3806 3807 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3808 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 3809 3810 // Initialize ranges, constraints and writeables 3811 JVMFlagRangeList::init(); 3812 JVMFlagConstraintList::init(); 3813 JVMFlagWriteableList::init(); 3814 3815 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3816 const char* hotspotrc = ".hotspotrc"; 3817 bool settings_file_specified = false; 3818 bool needs_hotspotrc_warning = false; 3819 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3820 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3821 3822 // Pointers to current working set of containers 3823 JavaVMInitArgs* cur_cmd_args; 3824 JavaVMInitArgs* cur_java_options_args; 3825 JavaVMInitArgs* cur_java_tool_options_args; 3826 3827 // Containers for modified/expanded options 3828 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3829 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3830 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3831 3832 3833 jint code = 3834 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3835 if (code != JNI_OK) { 3836 return code; 3837 } 3838 3839 code = parse_java_options_environment_variable(&initial_java_options_args); 3840 if (code != JNI_OK) { 3841 return code; 3842 } 3843 3844 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3845 &mod_java_tool_options_args, 3846 &cur_java_tool_options_args); 3847 if (code != JNI_OK) { 3848 return code; 3849 } 3850 3851 code = expand_vm_options_as_needed(initial_cmd_args, 3852 &mod_cmd_args, 3853 &cur_cmd_args); 3854 if (code != JNI_OK) { 3855 return code; 3856 } 3857 3858 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3859 &mod_java_options_args, 3860 &cur_java_options_args); 3861 if (code != JNI_OK) { 3862 return code; 3863 } 3864 3865 const char* flags_file = Arguments::get_jvm_flags_file(); 3866 settings_file_specified = (flags_file != NULL); 3867 3868 if (IgnoreUnrecognizedVMOptions) { 3869 cur_cmd_args->ignoreUnrecognized = true; 3870 cur_java_tool_options_args->ignoreUnrecognized = true; 3871 cur_java_options_args->ignoreUnrecognized = true; 3872 } 3873 3874 // Parse specified settings file 3875 if (settings_file_specified) { 3876 if (!process_settings_file(flags_file, true, 3877 cur_cmd_args->ignoreUnrecognized)) { 3878 return JNI_EINVAL; 3879 } 3880 } else { 3881 #ifdef ASSERT 3882 // Parse default .hotspotrc settings file 3883 if (!process_settings_file(".hotspotrc", false, 3884 cur_cmd_args->ignoreUnrecognized)) { 3885 return JNI_EINVAL; 3886 } 3887 #else 3888 struct stat buf; 3889 if (os::stat(hotspotrc, &buf) == 0) { 3890 needs_hotspotrc_warning = true; 3891 } 3892 #endif 3893 } 3894 3895 if (PrintVMOptions) { 3896 print_options(cur_java_tool_options_args); 3897 print_options(cur_cmd_args); 3898 print_options(cur_java_options_args); 3899 } 3900 3901 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3902 jint result = parse_vm_init_args(cur_java_tool_options_args, 3903 cur_java_options_args, 3904 cur_cmd_args); 3905 3906 if (result != JNI_OK) { 3907 return result; 3908 } 3909 3910 #if INCLUDE_CDS 3911 // Initialize shared archive paths which could include both base and dynamic archive paths 3912 if (!init_shared_archive_paths()) { 3913 return JNI_ENOMEM; 3914 } 3915 #endif 3916 3917 // Delay warning until here so that we've had a chance to process 3918 // the -XX:-PrintWarnings flag 3919 if (needs_hotspotrc_warning) { 3920 warning("%s file is present but has been ignored. " 3921 "Run with -XX:Flags=%s to load the file.", 3922 hotspotrc, hotspotrc); 3923 } 3924 3925 if (needs_module_property_warning) { 3926 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3927 " names that are reserved for internal use."); 3928 } 3929 3930 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3931 UNSUPPORTED_OPTION(UseLargePages); 3932 #endif 3933 3934 #if defined(AIX) 3935 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3936 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt); 3937 #endif 3938 3939 #ifndef PRODUCT 3940 if (TraceBytecodesAt != 0) { 3941 TraceBytecodes = true; 3942 } 3943 if (CountCompiledCalls) { 3944 if (UseCounterDecay) { 3945 warning("UseCounterDecay disabled because CountCalls is set"); 3946 UseCounterDecay = false; 3947 } 3948 } 3949 #endif // PRODUCT 3950 3951 if (ScavengeRootsInCode == 0) { 3952 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3953 warning("Forcing ScavengeRootsInCode non-zero"); 3954 } 3955 ScavengeRootsInCode = 1; 3956 } 3957 3958 if (!handle_deprecated_print_gc_flags()) { 3959 return JNI_EINVAL; 3960 } 3961 3962 // Set object alignment values. 3963 set_object_alignment(); 3964 3965 #if !INCLUDE_CDS 3966 if (DumpSharedSpaces || RequireSharedSpaces) { 3967 jio_fprintf(defaultStream::error_stream(), 3968 "Shared spaces are not supported in this VM\n"); 3969 return JNI_ERR; 3970 } 3971 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 3972 log_is_enabled(Info, cds)) { 3973 warning("Shared spaces are not supported in this VM"); 3974 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3975 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3976 } 3977 no_shared_spaces("CDS Disabled"); 3978 #endif // INCLUDE_CDS 3979 3980 return JNI_OK; 3981 } 3982 3983 jint Arguments::apply_ergo() { 3984 // Set flags based on ergonomics. 3985 jint result = set_ergonomics_flags(); 3986 if (result != JNI_OK) return result; 3987 3988 // Set heap size based on available physical memory 3989 set_heap_size(); 3990 3991 GCConfig::arguments()->initialize(); 3992 3993 set_shared_spaces_flags(); 3994 3995 // Initialize Metaspace flags and alignments 3996 Metaspace::ergo_initialize(); 3997 3998 // Set compiler flags after GC is selected and GC specific 3999 // flags (LoopStripMiningIter) are set. 4000 CompilerConfig::ergo_initialize(); 4001 4002 // Set bytecode rewriting flags 4003 set_bytecode_flags(); 4004 4005 // Set flags if aggressive optimization flags are enabled 4006 jint code = set_aggressive_opts_flags(); 4007 if (code != JNI_OK) { 4008 return code; 4009 } 4010 4011 // Turn off biased locking for locking debug mode flags, 4012 // which are subtly different from each other but neither works with 4013 // biased locking 4014 if (UseHeavyMonitors 4015 #ifdef COMPILER1 4016 || !UseFastLocking 4017 #endif // COMPILER1 4018 #if INCLUDE_JVMCI 4019 || !JVMCIUseFastLocking 4020 #endif 4021 ) { 4022 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4023 // flag set to true on command line; warn the user that they 4024 // can't enable biased locking here 4025 warning("Biased Locking is not supported with locking debug flags" 4026 "; ignoring UseBiasedLocking flag." ); 4027 } 4028 UseBiasedLocking = false; 4029 } 4030 4031 #ifdef CC_INTERP 4032 // Clear flags not supported on zero. 4033 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4034 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4035 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4036 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4037 #endif // CC_INTERP 4038 4039 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4040 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4041 DebugNonSafepoints = true; 4042 } 4043 4044 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4045 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4046 } 4047 4048 // Treat the odd case where local verification is enabled but remote 4049 // verification is not as if both were enabled. 4050 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4051 log_info(verification)("Turning on remote verification because local verification is on"); 4052 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4053 } 4054 4055 #ifndef PRODUCT 4056 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4057 if (use_vm_log()) { 4058 LogVMOutput = true; 4059 } 4060 } 4061 #endif // PRODUCT 4062 4063 if (PrintCommandLineFlags) { 4064 JVMFlag::printSetFlags(tty); 4065 } 4066 4067 // Apply CPU specific policy for the BiasedLocking 4068 if (UseBiasedLocking) { 4069 if (!VM_Version::use_biased_locking() && 4070 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4071 UseBiasedLocking = false; 4072 } 4073 } 4074 #ifdef COMPILER2 4075 if (!UseBiasedLocking) { 4076 UseOptoBiasInlining = false; 4077 } 4078 #endif 4079 4080 #if defined(IA32) 4081 // Only server compiler can optimize safepoints well enough. 4082 if (!is_server_compilation_mode_vm()) { 4083 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false); 4084 } 4085 #endif 4086 4087 // ThreadLocalHandshakesConstraintFunc handles the constraints. 4088 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 4089 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4090 } else { 4091 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4092 } 4093 4094 return JNI_OK; 4095 } 4096 4097 jint Arguments::adjust_after_os() { 4098 if (UseNUMA) { 4099 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 4100 FLAG_SET_ERGO(UseNUMA, false); 4101 } else if (UseParallelGC || UseParallelOldGC) { 4102 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4103 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4104 } 4105 } 4106 // UseNUMAInterleaving is set to ON for all collectors and 4107 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4108 // such as the parallel collector for Linux and Solaris will 4109 // interleave old gen and survivor spaces on top of NUMA 4110 // allocation policy for the eden space. 4111 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4112 // all platforms and ParallelGC on Windows will interleave all 4113 // of the heap spaces across NUMA nodes. 4114 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4115 FLAG_SET_ERGO(UseNUMAInterleaving, true); 4116 } 4117 } 4118 return JNI_OK; 4119 } 4120 4121 int Arguments::PropertyList_count(SystemProperty* pl) { 4122 int count = 0; 4123 while(pl != NULL) { 4124 count++; 4125 pl = pl->next(); 4126 } 4127 return count; 4128 } 4129 4130 // Return the number of readable properties. 4131 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4132 int count = 0; 4133 while(pl != NULL) { 4134 if (pl->is_readable()) { 4135 count++; 4136 } 4137 pl = pl->next(); 4138 } 4139 return count; 4140 } 4141 4142 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4143 assert(key != NULL, "just checking"); 4144 SystemProperty* prop; 4145 for (prop = pl; prop != NULL; prop = prop->next()) { 4146 if (strcmp(key, prop->key()) == 0) return prop->value(); 4147 } 4148 return NULL; 4149 } 4150 4151 // Return the value of the requested property provided that it is a readable property. 4152 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4153 assert(key != NULL, "just checking"); 4154 SystemProperty* prop; 4155 // Return the property value if the keys match and the property is not internal or 4156 // it's the special internal property "jdk.boot.class.path.append". 4157 for (prop = pl; prop != NULL; prop = prop->next()) { 4158 if (strcmp(key, prop->key()) == 0) { 4159 if (!prop->internal()) { 4160 return prop->value(); 4161 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4162 return prop->value(); 4163 } else { 4164 // Property is internal and not jdk.boot.class.path.append so return NULL. 4165 return NULL; 4166 } 4167 } 4168 } 4169 return NULL; 4170 } 4171 4172 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4173 int count = 0; 4174 const char* ret_val = NULL; 4175 4176 while(pl != NULL) { 4177 if(count >= index) { 4178 ret_val = pl->key(); 4179 break; 4180 } 4181 count++; 4182 pl = pl->next(); 4183 } 4184 4185 return ret_val; 4186 } 4187 4188 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4189 int count = 0; 4190 char* ret_val = NULL; 4191 4192 while(pl != NULL) { 4193 if(count >= index) { 4194 ret_val = pl->value(); 4195 break; 4196 } 4197 count++; 4198 pl = pl->next(); 4199 } 4200 4201 return ret_val; 4202 } 4203 4204 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4205 SystemProperty* p = *plist; 4206 if (p == NULL) { 4207 *plist = new_p; 4208 } else { 4209 while (p->next() != NULL) { 4210 p = p->next(); 4211 } 4212 p->set_next(new_p); 4213 } 4214 } 4215 4216 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4217 bool writeable, bool internal) { 4218 if (plist == NULL) 4219 return; 4220 4221 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4222 PropertyList_add(plist, new_p); 4223 } 4224 4225 void Arguments::PropertyList_add(SystemProperty *element) { 4226 PropertyList_add(&_system_properties, element); 4227 } 4228 4229 // This add maintains unique property key in the list. 4230 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4231 PropertyAppendable append, PropertyWriteable writeable, 4232 PropertyInternal internal) { 4233 if (plist == NULL) 4234 return; 4235 4236 // If property key exist then update with new value. 4237 SystemProperty* prop; 4238 for (prop = *plist; prop != NULL; prop = prop->next()) { 4239 if (strcmp(k, prop->key()) == 0) { 4240 if (append == AppendProperty) { 4241 prop->append_value(v); 4242 } else { 4243 prop->set_value(v); 4244 } 4245 return; 4246 } 4247 } 4248 4249 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4250 } 4251 4252 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4253 // Returns true if all of the source pointed by src has been copied over to 4254 // the destination buffer pointed by buf. Otherwise, returns false. 4255 // Notes: 4256 // 1. If the length (buflen) of the destination buffer excluding the 4257 // NULL terminator character is not long enough for holding the expanded 4258 // pid characters, it also returns false instead of returning the partially 4259 // expanded one. 4260 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4261 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4262 char* buf, size_t buflen) { 4263 const char* p = src; 4264 char* b = buf; 4265 const char* src_end = &src[srclen]; 4266 char* buf_end = &buf[buflen - 1]; 4267 4268 while (p < src_end && b < buf_end) { 4269 if (*p == '%') { 4270 switch (*(++p)) { 4271 case '%': // "%%" ==> "%" 4272 *b++ = *p++; 4273 break; 4274 case 'p': { // "%p" ==> current process id 4275 // buf_end points to the character before the last character so 4276 // that we could write '\0' to the end of the buffer. 4277 size_t buf_sz = buf_end - b + 1; 4278 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4279 4280 // if jio_snprintf fails or the buffer is not long enough to hold 4281 // the expanded pid, returns false. 4282 if (ret < 0 || ret >= (int)buf_sz) { 4283 return false; 4284 } else { 4285 b += ret; 4286 assert(*b == '\0', "fail in copy_expand_pid"); 4287 if (p == src_end && b == buf_end + 1) { 4288 // reach the end of the buffer. 4289 return true; 4290 } 4291 } 4292 p++; 4293 break; 4294 } 4295 default : 4296 *b++ = '%'; 4297 } 4298 } else { 4299 *b++ = *p++; 4300 } 4301 } 4302 *b = '\0'; 4303 return (p == src_end); // return false if not all of the source was copied 4304 }