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/collectorPolicy.hpp" 33 #include "gc/shared/gcArguments.hpp" 34 #include "gc/shared/gcConfig.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logConfiguration.hpp" 37 #include "logging/logStream.hpp" 38 #include "logging/logTag.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/universe.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/flags/jvmFlag.hpp" 45 #include "runtime/flags/jvmFlagConstraintList.hpp" 46 #include "runtime/flags/jvmFlagWriteableList.hpp" 47 #include "runtime/flags/jvmFlagRangeList.hpp" 48 #include "runtime/globals_extension.hpp" 49 #include "runtime/java.hpp" 50 #include "runtime/os.inline.hpp" 51 #include "runtime/safepoint.hpp" 52 #include "runtime/safepointMechanism.hpp" 53 #include "runtime/vm_version.hpp" 54 #include "services/management.hpp" 55 #include "services/memTracker.hpp" 56 #include "utilities/align.hpp" 57 #include "utilities/defaultStream.hpp" 58 #include "utilities/macros.hpp" 59 #include "utilities/stringUtils.hpp" 60 #if INCLUDE_JVMCI 61 #include "jvmci/jvmciRuntime.hpp" 62 #endif 63 #if INCLUDE_JFR 64 #include "jfr/jfr.hpp" 65 #endif 66 67 // Note: This is a special bug reporting site for the JVM 68 #ifdef VENDOR_URL_VM_BUG 69 # define DEFAULT_VENDOR_URL_BUG VENDOR_URL_VM_BUG 70 #else 71 # define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 72 #endif 73 #define DEFAULT_JAVA_LAUNCHER "generic" 74 75 char* Arguments::_jvm_flags_file = NULL; 76 char** Arguments::_jvm_flags_array = NULL; 77 int Arguments::_num_jvm_flags = 0; 78 char** Arguments::_jvm_args_array = NULL; 79 int Arguments::_num_jvm_args = 0; 80 char* Arguments::_java_command = NULL; 81 SystemProperty* Arguments::_system_properties = NULL; 82 const char* Arguments::_gc_log_filename = NULL; 83 size_t Arguments::_conservative_max_heap_alignment = 0; 84 size_t Arguments::_min_heap_size = 0; 85 Arguments::Mode Arguments::_mode = _mixed; 86 bool Arguments::_java_compiler = false; 87 bool Arguments::_xdebug_mode = false; 88 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 89 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 90 int Arguments::_sun_java_launcher_pid = -1; 91 bool Arguments::_sun_java_launcher_is_altjvm = false; 92 93 // These parameters are reset in method parse_vm_init_args() 94 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 95 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 96 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 97 bool Arguments::_ClipInlining = ClipInlining; 98 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 99 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 100 101 bool Arguments::_enable_preview = false; 102 103 char* Arguments::SharedArchivePath = NULL; 104 105 AgentLibraryList Arguments::_libraryList; 106 AgentLibraryList Arguments::_agentList; 107 108 // These are not set by the JDK's built-in launchers, but they can be set by 109 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 110 // JavaVMOption in jni.h. 111 abort_hook_t Arguments::_abort_hook = NULL; 112 exit_hook_t Arguments::_exit_hook = NULL; 113 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 114 115 116 SystemProperty *Arguments::_sun_boot_library_path = NULL; 117 SystemProperty *Arguments::_java_library_path = NULL; 118 SystemProperty *Arguments::_java_home = NULL; 119 SystemProperty *Arguments::_java_class_path = NULL; 120 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 121 SystemProperty *Arguments::_vm_info = NULL; 122 123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 124 PathString *Arguments::_system_boot_class_path = NULL; 125 bool Arguments::_has_jimage = false; 126 127 char* Arguments::_ext_dirs = NULL; 128 129 bool PathString::set_value(const char *value) { 130 if (_value != NULL) { 131 FreeHeap(_value); 132 } 133 _value = AllocateHeap(strlen(value)+1, mtArguments); 134 assert(_value != NULL, "Unable to allocate space for new path value"); 135 if (_value != NULL) { 136 strcpy(_value, value); 137 } else { 138 // not able to allocate 139 return false; 140 } 141 return true; 142 } 143 144 void PathString::append_value(const char *value) { 145 char *sp; 146 size_t len = 0; 147 if (value != NULL) { 148 len = strlen(value); 149 if (_value != NULL) { 150 len += strlen(_value); 151 } 152 sp = AllocateHeap(len+2, mtArguments); 153 assert(sp != NULL, "Unable to allocate space for new append path value"); 154 if (sp != NULL) { 155 if (_value != NULL) { 156 strcpy(sp, _value); 157 strcat(sp, os::path_separator()); 158 strcat(sp, value); 159 FreeHeap(_value); 160 } else { 161 strcpy(sp, value); 162 } 163 _value = sp; 164 } 165 } 166 } 167 168 PathString::PathString(const char* value) { 169 if (value == NULL) { 170 _value = NULL; 171 } else { 172 _value = AllocateHeap(strlen(value)+1, mtArguments); 173 strcpy(_value, value); 174 } 175 } 176 177 PathString::~PathString() { 178 if (_value != NULL) { 179 FreeHeap(_value); 180 _value = NULL; 181 } 182 } 183 184 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 185 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 186 size_t len = strlen(module_name) + 1; 187 _module_name = AllocateHeap(len, mtInternal); 188 strncpy(_module_name, module_name, len); // copy the trailing null 189 _path = new PathString(path); 190 } 191 192 ModulePatchPath::~ModulePatchPath() { 193 if (_module_name != NULL) { 194 FreeHeap(_module_name); 195 _module_name = NULL; 196 } 197 if (_path != NULL) { 198 delete _path; 199 _path = NULL; 200 } 201 } 202 203 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 204 if (key == NULL) { 205 _key = NULL; 206 } else { 207 _key = AllocateHeap(strlen(key)+1, mtArguments); 208 strcpy(_key, key); 209 } 210 _next = NULL; 211 _internal = internal; 212 _writeable = writeable; 213 } 214 215 AgentLibrary::AgentLibrary(const char* name, const char* options, 216 bool is_absolute_path, void* os_lib, 217 bool instrument_lib) { 218 _name = AllocateHeap(strlen(name)+1, mtArguments); 219 strcpy(_name, name); 220 if (options == NULL) { 221 _options = NULL; 222 } else { 223 _options = AllocateHeap(strlen(options)+1, mtArguments); 224 strcpy(_options, options); 225 } 226 _is_absolute_path = is_absolute_path; 227 _os_lib = os_lib; 228 _next = NULL; 229 _state = agent_invalid; 230 _is_static_lib = false; 231 _is_instrument_lib = instrument_lib; 232 } 233 234 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 235 // part of the option string. 236 static bool match_option(const JavaVMOption *option, const char* name, 237 const char** tail) { 238 size_t len = strlen(name); 239 if (strncmp(option->optionString, name, len) == 0) { 240 *tail = option->optionString + len; 241 return true; 242 } else { 243 return false; 244 } 245 } 246 247 // Check if 'option' matches 'name'. No "tail" is allowed. 248 static bool match_option(const JavaVMOption *option, const char* name) { 249 const char* tail = NULL; 250 bool result = match_option(option, name, &tail); 251 if (tail != NULL && *tail == '\0') { 252 return result; 253 } else { 254 return false; 255 } 256 } 257 258 // Return true if any of the strings in null-terminated array 'names' matches. 259 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 260 // the option must match exactly. 261 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 262 bool tail_allowed) { 263 for (/* empty */; *names != NULL; ++names) { 264 if (match_option(option, *names, tail)) { 265 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 266 return true; 267 } 268 } 269 } 270 return false; 271 } 272 273 #if INCLUDE_JFR 274 // return true on failure 275 static bool match_jfr_option(const JavaVMOption** option) { 276 assert((*option)->optionString != NULL, "invariant"); 277 char* tail = NULL; 278 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 279 return Jfr::on_start_flight_recording_option(option, tail); 280 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 281 return Jfr::on_flight_recorder_option(option, tail); 282 } 283 return false; 284 } 285 #endif 286 287 static void logOption(const char* opt) { 288 if (PrintVMOptions) { 289 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 290 } 291 } 292 293 bool needs_module_property_warning = false; 294 295 #define MODULE_PROPERTY_PREFIX "jdk.module." 296 #define MODULE_PROPERTY_PREFIX_LEN 11 297 #define ADDEXPORTS "addexports" 298 #define ADDEXPORTS_LEN 10 299 #define ADDREADS "addreads" 300 #define ADDREADS_LEN 8 301 #define ADDOPENS "addopens" 302 #define ADDOPENS_LEN 8 303 #define PATCH "patch" 304 #define PATCH_LEN 5 305 #define ADDMODS "addmods" 306 #define ADDMODS_LEN 7 307 #define LIMITMODS "limitmods" 308 #define LIMITMODS_LEN 9 309 #define PATH "path" 310 #define PATH_LEN 4 311 #define UPGRADE_PATH "upgrade.path" 312 #define UPGRADE_PATH_LEN 12 313 314 void Arguments::add_init_library(const char* name, char* options) { 315 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 316 } 317 318 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 319 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 320 } 321 322 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 323 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 324 } 325 326 // Late-binding agents not started via arguments 327 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 328 _agentList.add(agentLib); 329 } 330 331 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 332 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 333 return ((strncmp(option, property, len) == 0) && 334 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 335 } 336 337 // Return true if property starts with "jdk.module." and its ensuing chars match 338 // any of the reserved module properties. 339 // property should be passed without the leading "-D". 340 bool Arguments::is_internal_module_property(const char* property) { 341 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 342 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 343 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 344 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 345 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 346 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 347 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 348 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 349 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 350 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 351 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 352 return true; 353 } 354 } 355 return false; 356 } 357 358 // Process java launcher properties. 359 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 360 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 361 // sun.java.launcher.pid is defined. 362 // Must do this before setting up other system properties, 363 // as some of them may depend on launcher type. 364 for (int index = 0; index < args->nOptions; index++) { 365 const JavaVMOption* option = args->options + index; 366 const char* tail; 367 368 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 369 process_java_launcher_argument(tail, option->extraInfo); 370 continue; 371 } 372 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 373 if (strcmp(tail, "true") == 0) { 374 _sun_java_launcher_is_altjvm = true; 375 } 376 continue; 377 } 378 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 379 _sun_java_launcher_pid = atoi(tail); 380 continue; 381 } 382 } 383 } 384 385 // Initialize system properties key and value. 386 void Arguments::init_system_properties() { 387 388 // Set up _system_boot_class_path which is not a property but 389 // relies heavily on argument processing and the jdk.boot.class.path.append 390 // property. It is used to store the underlying system boot class path. 391 _system_boot_class_path = new PathString(NULL); 392 393 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 394 "Java Virtual Machine Specification", false)); 395 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 396 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 397 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 398 399 // Initialize the vm.info now, but it will need updating after argument parsing. 400 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 401 402 // Following are JVMTI agent writable properties. 403 // Properties values are set to NULL and they are 404 // os specific they are initialized in os::init_system_properties_values(). 405 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 406 _java_library_path = new SystemProperty("java.library.path", NULL, true); 407 _java_home = new SystemProperty("java.home", NULL, true); 408 _java_class_path = new SystemProperty("java.class.path", "", true); 409 // jdk.boot.class.path.append is a non-writeable, internal property. 410 // It can only be set by either: 411 // - -Xbootclasspath/a: 412 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 413 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 414 415 // Add to System Property list. 416 PropertyList_add(&_system_properties, _sun_boot_library_path); 417 PropertyList_add(&_system_properties, _java_library_path); 418 PropertyList_add(&_system_properties, _java_home); 419 PropertyList_add(&_system_properties, _java_class_path); 420 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 421 PropertyList_add(&_system_properties, _vm_info); 422 423 // Set OS specific system properties values 424 os::init_system_properties_values(); 425 } 426 427 // Update/Initialize System properties after JDK version number is known 428 void Arguments::init_version_specific_system_properties() { 429 enum { bufsz = 16 }; 430 char buffer[bufsz]; 431 const char* spec_vendor = "Oracle Corporation"; 432 uint32_t spec_version = JDK_Version::current().major_version(); 433 434 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 435 436 PropertyList_add(&_system_properties, 437 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 438 PropertyList_add(&_system_properties, 439 new SystemProperty("java.vm.specification.version", buffer, false)); 440 PropertyList_add(&_system_properties, 441 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 442 } 443 444 /* 445 * -XX argument processing: 446 * 447 * -XX arguments are defined in several places, such as: 448 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 449 * -XX arguments are parsed in parse_argument(). 450 * -XX argument bounds checking is done in check_vm_args_consistency(). 451 * 452 * Over time -XX arguments may change. There are mechanisms to handle common cases: 453 * 454 * ALIASED: An option that is simply another name for another option. This is often 455 * part of the process of deprecating a flag, but not all aliases need 456 * to be deprecated. 457 * 458 * Create an alias for an option by adding the old and new option names to the 459 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 460 * 461 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 462 * support may be removed in the future. Both regular and aliased options may be 463 * deprecated. 464 * 465 * Add a deprecation warning for an option (or alias) by adding an entry in the 466 * "special_jvm_flags" table and setting the "deprecated_in" field. 467 * Often an option "deprecated" in one major release will 468 * be made "obsolete" in the next. In this case the entry should also have its 469 * "obsolete_in" field set. 470 * 471 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 472 * on the command line. A warning is printed to let the user know that option might not 473 * be accepted in the future. 474 * 475 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 476 * table and setting the "obsolete_in" field. 477 * 478 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 479 * to the current JDK version. The system will flatly refuse to admit the existence of 480 * the flag. This allows a flag to die automatically over JDK releases. 481 * 482 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 483 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 484 * - Newly obsolete or expired deprecated options should have their global variable 485 * definitions removed (from globals.hpp, etc) and related implementations removed. 486 * 487 * Recommended approach for removing options: 488 * 489 * To remove options commonly used by customers (e.g. product -XX options), use 490 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 491 * 492 * To remove internal options (e.g. diagnostic, experimental, develop options), use 493 * a 2-step model adding major release numbers to the obsolete and expire columns. 494 * 495 * To change the name of an option, use the alias table as well as a 2-step 496 * model adding major release numbers to the deprecate and expire columns. 497 * Think twice about aliasing commonly used customer options. 498 * 499 * There are times when it is appropriate to leave a future release number as undefined. 500 * 501 * Tests: Aliases should be tested in VMAliasOptions.java. 502 * Deprecated options should be tested in VMDeprecatedOptions.java. 503 */ 504 505 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 506 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 507 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 508 // the command-line as usual, but will issue a warning. 509 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 510 // the command-line, while issuing a warning and ignoring the flag value. 511 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 512 // existence of the flag. 513 // 514 // MANUAL CLEANUP ON JDK VERSION UPDATES: 515 // This table ensures that the handling of options will update automatically when the JDK 516 // version is incremented, but the source code needs to be cleanup up manually: 517 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 518 // variable should be removed, as well as users of the variable. 519 // - As "deprecated" options age into "obsolete" options, move the entry into the 520 // "Obsolete Flags" section of the table. 521 // - All expired options should be removed from the table. 522 static SpecialFlag const special_jvm_flags[] = { 523 // -------------- Deprecated Flags -------------- 524 // --- Non-alias flags - sorted by obsolete_in then expired_in: 525 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 526 { "UseConcMarkSweepGC", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 527 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 528 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 529 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 530 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() }, 531 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() }, 532 { "FailOverToOldVerifier", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::undefined() }, 533 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 534 535 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 536 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 537 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 538 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 539 540 // -------------- Obsolete Flags - sorted by expired_in -------------- 541 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 542 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 543 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 544 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 545 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 546 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 547 { "ProfilerPrintByteCodeStatistics", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 548 { "ProfilerRecordPC", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 549 { "ProfileVM", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 550 { "ProfileIntervals", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 551 { "ProfileIntervalsTicks", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 552 { "ProfilerCheckIntervals", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 553 { "ProfilerNumberOfInterpretedMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 554 { "ProfilerNumberOfCompiledMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 555 { "ProfilerNumberOfStubMethods", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 556 { "ProfilerNumberOfRuntimeStubNodes", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 557 { "UseImplicitStableValues", JDK_Version::undefined(), JDK_Version::jdk(13), JDK_Version::jdk(14) }, 558 559 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 560 // These entries will generate build errors. Their purpose is to test the macros. 561 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 562 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 563 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 564 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 565 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 566 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 567 #endif 568 569 { NULL, JDK_Version(0), JDK_Version(0) } 570 }; 571 572 // Flags that are aliases for other flags. 573 typedef struct { 574 const char* alias_name; 575 const char* real_name; 576 } AliasedFlag; 577 578 static AliasedFlag const aliased_jvm_flags[] = { 579 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 580 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 581 { NULL, NULL} 582 }; 583 584 // NOTE: A compatibility request will be necessary for each alias to be removed. 585 static AliasedLoggingFlag const aliased_logging_flags[] = { 586 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 587 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 588 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 589 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 590 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 591 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 592 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 593 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 594 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 595 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 596 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) }, 597 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 598 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 599 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 600 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 601 }; 602 603 #ifndef PRODUCT 604 // These options are removed in jdk9. Remove this code for jdk10. 605 static AliasedFlag const removed_develop_logging_flags[] = { 606 { "TraceClassInitialization", "-Xlog:class+init" }, 607 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 608 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 609 { "TraceItables", "-Xlog:itables=debug" }, 610 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 611 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 612 { "TraceStartupTime", "-Xlog:startuptime" }, 613 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 614 { "PrintVtables", "-Xlog:vtables=debug" }, 615 { "VerboseVerification", "-Xlog:verification" }, 616 { NULL, NULL } 617 }; 618 #endif //PRODUCT 619 620 // Return true if "v" is less than "other", where "other" may be "undefined". 621 static bool version_less_than(JDK_Version v, JDK_Version other) { 622 assert(!v.is_undefined(), "must be defined"); 623 if (!other.is_undefined() && v.compare(other) >= 0) { 624 return false; 625 } else { 626 return true; 627 } 628 } 629 630 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 631 632 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 633 // Allow extensions to have priority 634 if (lookup_special_flag_ext(flag_name, flag)) { 635 return true; 636 } 637 638 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 639 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 640 flag = special_jvm_flags[i]; 641 return true; 642 } 643 } 644 return false; 645 } 646 647 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 648 assert(version != NULL, "Must provide a version buffer"); 649 SpecialFlag flag; 650 if (lookup_special_flag(flag_name, flag)) { 651 if (!flag.obsolete_in.is_undefined()) { 652 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 653 *version = flag.obsolete_in; 654 return true; 655 } 656 } 657 } 658 return false; 659 } 660 661 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 662 assert(version != NULL, "Must provide a version buffer"); 663 SpecialFlag flag; 664 if (lookup_special_flag(flag_name, flag)) { 665 if (!flag.deprecated_in.is_undefined()) { 666 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 667 version_less_than(JDK_Version::current(), flag.expired_in)) { 668 *version = flag.deprecated_in; 669 return 1; 670 } else { 671 return -1; 672 } 673 } 674 } 675 return 0; 676 } 677 678 #ifndef PRODUCT 679 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 680 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 681 const AliasedFlag& flag = removed_develop_logging_flags[i]; 682 if (strcmp(flag.alias_name, name) == 0) { 683 return flag.real_name; 684 } 685 } 686 return NULL; 687 } 688 #endif // PRODUCT 689 690 const char* Arguments::real_flag_name(const char *flag_name) { 691 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 692 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 693 if (strcmp(flag_status.alias_name, flag_name) == 0) { 694 return flag_status.real_name; 695 } 696 } 697 return flag_name; 698 } 699 700 #ifdef ASSERT 701 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 702 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 703 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 704 return true; 705 } 706 } 707 return false; 708 } 709 710 // Verifies the correctness of the entries in the special_jvm_flags table. 711 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 712 // version being earlier than the deprecation version, then a warning is issued 713 // and verification fails - by returning false. If it is detected that the table 714 // is out of date, with respect to the current version, then a warning is issued 715 // but verification does not fail. This allows the VM to operate when the version 716 // is first updated, without needing to update all the impacted flags at the 717 // same time. 718 static bool verify_special_jvm_flags() { 719 bool success = true; 720 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 721 const SpecialFlag& flag = special_jvm_flags[i]; 722 if (lookup_special_flag(flag.name, i)) { 723 warning("Duplicate special flag declaration \"%s\"", flag.name); 724 success = false; 725 } 726 if (flag.deprecated_in.is_undefined() && 727 flag.obsolete_in.is_undefined()) { 728 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 729 success = false; 730 } 731 732 if (!flag.deprecated_in.is_undefined()) { 733 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 734 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 735 success = false; 736 } 737 738 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 739 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 740 success = false; 741 } 742 } 743 744 if (!flag.obsolete_in.is_undefined()) { 745 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 746 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 747 success = false; 748 } 749 750 // if flag has become obsolete it should not have a "globals" flag defined anymore. 751 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 752 if (JVMFlag::find_flag(flag.name) != NULL) { 753 // Temporarily disable the warning: 8196739 754 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 755 } 756 } 757 } 758 759 if (!flag.expired_in.is_undefined()) { 760 // if flag has become expired it should not have a "globals" flag defined anymore. 761 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 762 if (JVMFlag::find_flag(flag.name) != NULL) { 763 // Temporarily disable the warning: 8196739 764 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 765 } 766 } 767 } 768 769 } 770 return success; 771 } 772 #endif 773 774 // Parses a size specification string. 775 bool Arguments::atojulong(const char *s, julong* result) { 776 julong n = 0; 777 778 // First char must be a digit. Don't allow negative numbers or leading spaces. 779 if (!isdigit(*s)) { 780 return false; 781 } 782 783 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 784 char* remainder; 785 errno = 0; 786 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 787 if (errno != 0) { 788 return false; 789 } 790 791 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 792 if (remainder == s || strlen(remainder) > 1) { 793 return false; 794 } 795 796 switch (*remainder) { 797 case 'T': case 't': 798 *result = n * G * K; 799 // Check for overflow. 800 if (*result/((julong)G * K) != n) return false; 801 return true; 802 case 'G': case 'g': 803 *result = n * G; 804 if (*result/G != n) return false; 805 return true; 806 case 'M': case 'm': 807 *result = n * M; 808 if (*result/M != n) return false; 809 return true; 810 case 'K': case 'k': 811 *result = n * K; 812 if (*result/K != n) return false; 813 return true; 814 case '\0': 815 *result = n; 816 return true; 817 default: 818 return false; 819 } 820 } 821 822 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 823 if (size < min_size) return arg_too_small; 824 if (size > max_size) return arg_too_big; 825 return arg_in_range; 826 } 827 828 // Describe an argument out of range error 829 void Arguments::describe_range_error(ArgsRange errcode) { 830 switch(errcode) { 831 case arg_too_big: 832 jio_fprintf(defaultStream::error_stream(), 833 "The specified size exceeds the maximum " 834 "representable size.\n"); 835 break; 836 case arg_too_small: 837 case arg_unreadable: 838 case arg_in_range: 839 // do nothing for now 840 break; 841 default: 842 ShouldNotReachHere(); 843 } 844 } 845 846 static bool set_bool_flag(const char* name, bool value, JVMFlag::Flags origin) { 847 if (JVMFlag::boolAtPut(name, &value, origin) == JVMFlag::SUCCESS) { 848 return true; 849 } else { 850 return false; 851 } 852 } 853 854 static bool set_fp_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) { 855 char* end; 856 errno = 0; 857 double v = strtod(value, &end); 858 if ((errno != 0) || (*end != 0)) { 859 return false; 860 } 861 862 if (JVMFlag::doubleAtPut(name, &v, origin) == JVMFlag::SUCCESS) { 863 return true; 864 } 865 return false; 866 } 867 868 static bool set_numeric_flag(const char* name, char* value, JVMFlag::Flags origin) { 869 julong v; 870 int int_v; 871 intx intx_v; 872 bool is_neg = false; 873 JVMFlag* result = JVMFlag::find_flag(name, strlen(name)); 874 875 if (result == NULL) { 876 return false; 877 } 878 879 // Check the sign first since atojulong() parses only unsigned values. 880 if (*value == '-') { 881 if (!result->is_intx() && !result->is_int()) { 882 return false; 883 } 884 value++; 885 is_neg = true; 886 } 887 if (!Arguments::atojulong(value, &v)) { 888 return false; 889 } 890 if (result->is_int()) { 891 int_v = (int) v; 892 if (is_neg) { 893 int_v = -int_v; 894 } 895 return JVMFlag::intAtPut(result, &int_v, origin) == JVMFlag::SUCCESS; 896 } else if (result->is_uint()) { 897 uint uint_v = (uint) v; 898 return JVMFlag::uintAtPut(result, &uint_v, origin) == JVMFlag::SUCCESS; 899 } else if (result->is_intx()) { 900 intx_v = (intx) v; 901 if (is_neg) { 902 intx_v = -intx_v; 903 } 904 return JVMFlag::intxAtPut(result, &intx_v, origin) == JVMFlag::SUCCESS; 905 } else if (result->is_uintx()) { 906 uintx uintx_v = (uintx) v; 907 return JVMFlag::uintxAtPut(result, &uintx_v, origin) == JVMFlag::SUCCESS; 908 } else if (result->is_uint64_t()) { 909 uint64_t uint64_t_v = (uint64_t) v; 910 return JVMFlag::uint64_tAtPut(result, &uint64_t_v, origin) == JVMFlag::SUCCESS; 911 } else if (result->is_size_t()) { 912 size_t size_t_v = (size_t) v; 913 return JVMFlag::size_tAtPut(result, &size_t_v, origin) == JVMFlag::SUCCESS; 914 } else if (result->is_double()) { 915 double double_v = (double) v; 916 return JVMFlag::doubleAtPut(result, &double_v, origin) == JVMFlag::SUCCESS; 917 } else { 918 return false; 919 } 920 } 921 922 static bool set_string_flag(const char* name, const char* value, JVMFlag::Flags origin) { 923 if (JVMFlag::ccstrAtPut(name, &value, origin) != JVMFlag::SUCCESS) return false; 924 // Contract: JVMFlag always returns a pointer that needs freeing. 925 FREE_C_HEAP_ARRAY(char, value); 926 return true; 927 } 928 929 static bool append_to_string_flag(const char* name, const char* new_value, JVMFlag::Flags origin) { 930 const char* old_value = ""; 931 if (JVMFlag::ccstrAt(name, &old_value) != JVMFlag::SUCCESS) return false; 932 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 933 size_t new_len = strlen(new_value); 934 const char* value; 935 char* free_this_too = NULL; 936 if (old_len == 0) { 937 value = new_value; 938 } else if (new_len == 0) { 939 value = old_value; 940 } else { 941 size_t length = old_len + 1 + new_len + 1; 942 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 943 // each new setting adds another LINE to the switch: 944 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 945 value = buf; 946 free_this_too = buf; 947 } 948 (void) JVMFlag::ccstrAtPut(name, &value, origin); 949 // JVMFlag always returns a pointer that needs freeing. 950 FREE_C_HEAP_ARRAY(char, value); 951 if (free_this_too != NULL) { 952 // JVMFlag made its own copy, so I must delete my own temp. buffer. 953 FREE_C_HEAP_ARRAY(char, free_this_too); 954 } 955 return true; 956 } 957 958 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 959 const char* real_name = real_flag_name(arg); 960 JDK_Version since = JDK_Version(); 961 switch (is_deprecated_flag(arg, &since)) { 962 case -1: 963 return NULL; // obsolete or expired, don't process normally 964 case 0: 965 return real_name; 966 case 1: { 967 if (warn) { 968 char version[256]; 969 since.to_string(version, sizeof(version)); 970 if (real_name != arg) { 971 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 972 arg, version, real_name); 973 } else { 974 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 975 arg, version); 976 } 977 } 978 return real_name; 979 } 980 } 981 ShouldNotReachHere(); 982 return NULL; 983 } 984 985 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 986 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 987 // Set tagset string buffer at max size of 256, large enough for any alias tagset 988 const int max_tagset_size = 256; 989 int max_tagset_len = max_tagset_size - 1; 990 char tagset_buffer[max_tagset_size]; 991 tagset_buffer[0] = '\0'; 992 993 // Write tag-set for aliased logging option, in string list form 994 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 995 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 996 if (i > 0) { 997 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 998 } 999 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 1000 } 1001 if (!alf.exactMatch) { 1002 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 1003 } 1004 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 1005 (on) ? "+" : "-", 1006 name, 1007 tagset_buffer, 1008 (on) ? LogLevel::name(alf.level) : "off"); 1009 } 1010 1011 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 1012 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 1013 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1014 if (strcmp(alf.alias_name, name) == 0) { 1015 log_deprecated_flag(name, on, alf); 1016 return alf; 1017 } 1018 } 1019 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1020 return a; 1021 } 1022 1023 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) { 1024 1025 // range of acceptable characters spelled out for portability reasons 1026 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1027 #define BUFLEN 255 1028 char name[BUFLEN+1]; 1029 char dummy; 1030 const char* real_name; 1031 bool warn_if_deprecated = true; 1032 1033 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1034 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1035 if (alf.alias_name != NULL){ 1036 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1037 return true; 1038 } 1039 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1040 if (real_name == NULL) { 1041 return false; 1042 } 1043 return set_bool_flag(real_name, false, origin); 1044 } 1045 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1046 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1047 if (alf.alias_name != NULL){ 1048 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1049 return true; 1050 } 1051 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1052 if (real_name == NULL) { 1053 return false; 1054 } 1055 return set_bool_flag(real_name, true, origin); 1056 } 1057 1058 char punct; 1059 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1060 const char* value = strchr(arg, '=') + 1; 1061 JVMFlag* flag; 1062 1063 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1064 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1065 if (alf.alias_name != NULL) { 1066 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1067 return true; 1068 } 1069 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1070 if (real_name == NULL) { 1071 return false; 1072 } 1073 flag = JVMFlag::find_flag(real_name); 1074 if (flag != NULL && flag->is_ccstr()) { 1075 if (flag->ccstr_accumulates()) { 1076 return append_to_string_flag(real_name, value, origin); 1077 } else { 1078 if (value[0] == '\0') { 1079 value = NULL; 1080 } 1081 return set_string_flag(real_name, value, origin); 1082 } 1083 } else { 1084 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1085 } 1086 } 1087 1088 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1089 const char* value = strchr(arg, '=') + 1; 1090 // -XX:Foo:=xxx will reset the string flag to the given value. 1091 if (value[0] == '\0') { 1092 value = NULL; 1093 } 1094 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1095 if (real_name == NULL) { 1096 return false; 1097 } 1098 return set_string_flag(real_name, value, origin); 1099 } 1100 1101 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1102 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1103 #define NUMBER_RANGE "[0123456789eE+-]" 1104 char value[BUFLEN + 1]; 1105 char value2[BUFLEN + 1]; 1106 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1107 // Looks like a floating-point number -- try again with more lenient format string 1108 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_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 return set_fp_numeric_flag(real_name, value, origin); 1114 } 1115 } 1116 1117 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1118 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1119 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1120 if (real_name == NULL) { 1121 return false; 1122 } 1123 return set_numeric_flag(real_name, value, origin); 1124 } 1125 1126 return false; 1127 } 1128 1129 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1130 assert(bldarray != NULL, "illegal argument"); 1131 1132 if (arg == NULL) { 1133 return; 1134 } 1135 1136 int new_count = *count + 1; 1137 1138 // expand the array and add arg to the last element 1139 if (*bldarray == NULL) { 1140 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1141 } else { 1142 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1143 } 1144 (*bldarray)[*count] = os::strdup_check_oom(arg); 1145 *count = new_count; 1146 } 1147 1148 void Arguments::build_jvm_args(const char* arg) { 1149 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1150 } 1151 1152 void Arguments::build_jvm_flags(const char* arg) { 1153 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1154 } 1155 1156 // utility function to return a string that concatenates all 1157 // strings in a given char** array 1158 const char* Arguments::build_resource_string(char** args, int count) { 1159 if (args == NULL || count == 0) { 1160 return NULL; 1161 } 1162 size_t length = 0; 1163 for (int i = 0; i < count; i++) { 1164 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1165 } 1166 char* s = NEW_RESOURCE_ARRAY(char, length); 1167 char* dst = s; 1168 for (int j = 0; j < count; j++) { 1169 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1170 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1171 dst += offset; 1172 length -= offset; 1173 } 1174 return (const char*) s; 1175 } 1176 1177 void Arguments::print_on(outputStream* st) { 1178 st->print_cr("VM Arguments:"); 1179 if (num_jvm_flags() > 0) { 1180 st->print("jvm_flags: "); print_jvm_flags_on(st); 1181 st->cr(); 1182 } 1183 if (num_jvm_args() > 0) { 1184 st->print("jvm_args: "); print_jvm_args_on(st); 1185 st->cr(); 1186 } 1187 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1188 if (_java_class_path != NULL) { 1189 char* path = _java_class_path->value(); 1190 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1191 } 1192 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1193 } 1194 1195 void Arguments::print_summary_on(outputStream* st) { 1196 // Print the command line. Environment variables that are helpful for 1197 // reproducing the problem are written later in the hs_err file. 1198 // flags are from setting file 1199 if (num_jvm_flags() > 0) { 1200 st->print_raw("Settings File: "); 1201 print_jvm_flags_on(st); 1202 st->cr(); 1203 } 1204 // args are the command line and environment variable arguments. 1205 st->print_raw("Command Line: "); 1206 if (num_jvm_args() > 0) { 1207 print_jvm_args_on(st); 1208 } 1209 // this is the classfile and any arguments to the java program 1210 if (java_command() != NULL) { 1211 st->print("%s", java_command()); 1212 } 1213 st->cr(); 1214 } 1215 1216 void Arguments::print_jvm_flags_on(outputStream* st) { 1217 if (_num_jvm_flags > 0) { 1218 for (int i=0; i < _num_jvm_flags; i++) { 1219 st->print("%s ", _jvm_flags_array[i]); 1220 } 1221 } 1222 } 1223 1224 void Arguments::print_jvm_args_on(outputStream* st) { 1225 if (_num_jvm_args > 0) { 1226 for (int i=0; i < _num_jvm_args; i++) { 1227 st->print("%s ", _jvm_args_array[i]); 1228 } 1229 } 1230 } 1231 1232 bool Arguments::process_argument(const char* arg, 1233 jboolean ignore_unrecognized, 1234 JVMFlag::Flags origin) { 1235 JDK_Version since = JDK_Version(); 1236 1237 if (parse_argument(arg, origin)) { 1238 return true; 1239 } 1240 1241 // Determine if the flag has '+', '-', or '=' characters. 1242 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1243 const char* const argname = has_plus_minus ? arg + 1 : arg; 1244 1245 size_t arg_len; 1246 const char* equal_sign = strchr(argname, '='); 1247 if (equal_sign == NULL) { 1248 arg_len = strlen(argname); 1249 } else { 1250 arg_len = equal_sign - argname; 1251 } 1252 1253 // Only make the obsolete check for valid arguments. 1254 if (arg_len <= BUFLEN) { 1255 // Construct a string which consists only of the argument name without '+', '-', or '='. 1256 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1257 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1258 if (is_obsolete_flag(stripped_argname, &since)) { 1259 char version[256]; 1260 since.to_string(version, sizeof(version)); 1261 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1262 return true; 1263 } 1264 #ifndef PRODUCT 1265 else { 1266 const char* replacement; 1267 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1268 log_warning(arguments)("%s has been removed. Please use %s instead.", 1269 stripped_argname, 1270 replacement); 1271 return false; 1272 } 1273 } 1274 #endif //PRODUCT 1275 } 1276 1277 // For locked flags, report a custom error message if available. 1278 // Otherwise, report the standard unrecognized VM option. 1279 JVMFlag* found_flag = JVMFlag::find_flag((const char*)argname, arg_len, true, true); 1280 if (found_flag != NULL) { 1281 char locked_message_buf[BUFLEN]; 1282 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1283 if (strlen(locked_message_buf) == 0) { 1284 if (found_flag->is_bool() && !has_plus_minus) { 1285 jio_fprintf(defaultStream::error_stream(), 1286 "Missing +/- setting for VM option '%s'\n", argname); 1287 } else if (!found_flag->is_bool() && has_plus_minus) { 1288 jio_fprintf(defaultStream::error_stream(), 1289 "Unexpected +/- setting in VM option '%s'\n", argname); 1290 } else { 1291 jio_fprintf(defaultStream::error_stream(), 1292 "Improperly specified VM option '%s'\n", argname); 1293 } 1294 } else { 1295 #ifdef PRODUCT 1296 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1297 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1298 if (ignore_unrecognized && mismatched) { 1299 return true; 1300 } 1301 #endif 1302 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1303 } 1304 } else { 1305 if (ignore_unrecognized) { 1306 return true; 1307 } 1308 jio_fprintf(defaultStream::error_stream(), 1309 "Unrecognized VM option '%s'\n", argname); 1310 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1311 if (fuzzy_matched != NULL) { 1312 jio_fprintf(defaultStream::error_stream(), 1313 "Did you mean '%s%s%s'? ", 1314 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1315 fuzzy_matched->_name, 1316 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1317 } 1318 } 1319 1320 // allow for commandline "commenting out" options like -XX:#+Verbose 1321 return arg[0] == '#'; 1322 } 1323 1324 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1325 FILE* stream = fopen(file_name, "rb"); 1326 if (stream == NULL) { 1327 if (should_exist) { 1328 jio_fprintf(defaultStream::error_stream(), 1329 "Could not open settings file %s\n", file_name); 1330 return false; 1331 } else { 1332 return true; 1333 } 1334 } 1335 1336 char token[1024]; 1337 int pos = 0; 1338 1339 bool in_white_space = true; 1340 bool in_comment = false; 1341 bool in_quote = false; 1342 char quote_c = 0; 1343 bool result = true; 1344 1345 int c = getc(stream); 1346 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1347 if (in_white_space) { 1348 if (in_comment) { 1349 if (c == '\n') in_comment = false; 1350 } else { 1351 if (c == '#') in_comment = true; 1352 else if (!isspace(c)) { 1353 in_white_space = false; 1354 token[pos++] = c; 1355 } 1356 } 1357 } else { 1358 if (c == '\n' || (!in_quote && isspace(c))) { 1359 // token ends at newline, or at unquoted whitespace 1360 // this allows a way to include spaces in string-valued options 1361 token[pos] = '\0'; 1362 logOption(token); 1363 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1364 build_jvm_flags(token); 1365 pos = 0; 1366 in_white_space = true; 1367 in_quote = false; 1368 } else if (!in_quote && (c == '\'' || c == '"')) { 1369 in_quote = true; 1370 quote_c = c; 1371 } else if (in_quote && (c == quote_c)) { 1372 in_quote = false; 1373 } else { 1374 token[pos++] = c; 1375 } 1376 } 1377 c = getc(stream); 1378 } 1379 if (pos > 0) { 1380 token[pos] = '\0'; 1381 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1382 build_jvm_flags(token); 1383 } 1384 fclose(stream); 1385 return result; 1386 } 1387 1388 //============================================================================================================= 1389 // Parsing of properties (-D) 1390 1391 const char* Arguments::get_property(const char* key) { 1392 return PropertyList_get_value(system_properties(), key); 1393 } 1394 1395 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1396 const char* eq = strchr(prop, '='); 1397 const char* key; 1398 const char* value = ""; 1399 1400 if (eq == NULL) { 1401 // property doesn't have a value, thus use passed string 1402 key = prop; 1403 } else { 1404 // property have a value, thus extract it and save to the 1405 // allocated string 1406 size_t key_len = eq - prop; 1407 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1408 1409 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1410 key = tmp_key; 1411 1412 value = &prop[key_len + 1]; 1413 } 1414 1415 if (strcmp(key, "java.compiler") == 0) { 1416 process_java_compiler_argument(value); 1417 // Record value in Arguments, but let it get passed to Java. 1418 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1419 strcmp(key, "sun.java.launcher.pid") == 0) { 1420 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1421 // private and are processed in process_sun_java_launcher_properties(); 1422 // the sun.java.launcher property is passed on to the java application 1423 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1424 // append is true, writable is true, internal is false 1425 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1426 WriteableProperty, ExternalProperty); 1427 } else { 1428 if (strcmp(key, "sun.java.command") == 0) { 1429 char *old_java_command = _java_command; 1430 _java_command = os::strdup_check_oom(value, mtArguments); 1431 if (old_java_command != NULL) { 1432 os::free(old_java_command); 1433 } 1434 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1435 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1436 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1437 // its value without going through the property list or making a Java call. 1438 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1439 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1440 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1441 os::free((void *)old_java_vendor_url_bug); 1442 } 1443 } 1444 1445 // Create new property and add at the end of the list 1446 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1447 } 1448 1449 if (key != prop) { 1450 // SystemProperty copy passed value, thus free previously allocated 1451 // memory 1452 FreeHeap((void *)key); 1453 } 1454 1455 return true; 1456 } 1457 1458 #if INCLUDE_CDS 1459 const char* unsupported_properties[] = { "jdk.module.limitmods", 1460 "jdk.module.upgrade.path", 1461 "jdk.module.patch.0" }; 1462 const char* unsupported_options[] = { "--limit-modules", 1463 "--upgrade-module-path", 1464 "--patch-module" 1465 }; 1466 void Arguments::check_unsupported_dumping_properties() { 1467 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1468 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1469 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1470 SystemProperty* sp = system_properties(); 1471 while (sp != NULL) { 1472 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1473 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1474 vm_exit_during_initialization( 1475 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1476 } 1477 } 1478 sp = sp->next(); 1479 } 1480 1481 // Check for an exploded module build in use with -Xshare:dump. 1482 if (!has_jimage()) { 1483 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1484 } 1485 } 1486 1487 bool Arguments::check_unsupported_cds_runtime_properties() { 1488 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1489 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1490 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1491 if (get_property(unsupported_properties[i]) != NULL) { 1492 if (RequireSharedSpaces) { 1493 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1494 } 1495 return true; 1496 } 1497 } 1498 return false; 1499 } 1500 #endif 1501 1502 //=========================================================================================================== 1503 // Setting int/mixed/comp mode flags 1504 1505 void Arguments::set_mode_flags(Mode mode) { 1506 // Set up default values for all flags. 1507 // If you add a flag to any of the branches below, 1508 // add a default value for it here. 1509 set_java_compiler(false); 1510 _mode = mode; 1511 1512 // Ensure Agent_OnLoad has the correct initial values. 1513 // This may not be the final mode; mode may change later in onload phase. 1514 PropertyList_unique_add(&_system_properties, "java.vm.info", 1515 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1516 1517 UseInterpreter = true; 1518 UseCompiler = true; 1519 UseLoopCounter = true; 1520 1521 // Default values may be platform/compiler dependent - 1522 // use the saved values 1523 ClipInlining = Arguments::_ClipInlining; 1524 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1525 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1526 BackgroundCompilation = Arguments::_BackgroundCompilation; 1527 if (TieredCompilation) { 1528 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1529 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1530 } 1531 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1532 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1533 } 1534 } 1535 1536 // Change from defaults based on mode 1537 switch (mode) { 1538 default: 1539 ShouldNotReachHere(); 1540 break; 1541 case _int: 1542 UseCompiler = false; 1543 UseLoopCounter = false; 1544 AlwaysCompileLoopMethods = false; 1545 UseOnStackReplacement = false; 1546 break; 1547 case _mixed: 1548 // same as default 1549 break; 1550 case _comp: 1551 UseInterpreter = false; 1552 BackgroundCompilation = false; 1553 ClipInlining = false; 1554 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1555 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1556 // compile a level 4 (C2) and then continue executing it. 1557 if (TieredCompilation) { 1558 Tier3InvokeNotifyFreqLog = 0; 1559 Tier4InvocationThreshold = 0; 1560 } 1561 break; 1562 } 1563 } 1564 1565 // Conflict: required to use shared spaces (-Xshare:on), but 1566 // incompatible command line options were chosen. 1567 static void no_shared_spaces(const char* message) { 1568 if (RequireSharedSpaces) { 1569 jio_fprintf(defaultStream::error_stream(), 1570 "Class data sharing is inconsistent with other specified options.\n"); 1571 vm_exit_during_initialization("Unable to use shared archive", message); 1572 } else { 1573 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1574 } 1575 } 1576 1577 void set_object_alignment() { 1578 // Object alignment. 1579 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1580 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1581 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1582 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1583 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1584 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1585 1586 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1587 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1588 1589 // Oop encoding heap max 1590 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1591 1592 if (SurvivorAlignmentInBytes == 0) { 1593 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1594 } 1595 } 1596 1597 size_t Arguments::max_heap_for_compressed_oops() { 1598 // Avoid sign flip. 1599 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1600 // We need to fit both the NULL page and the heap into the memory budget, while 1601 // keeping alignment constraints of the heap. To guarantee the latter, as the 1602 // NULL page is located before the heap, we pad the NULL page to the conservative 1603 // maximum alignment that the GC may ever impose upon the heap. 1604 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1605 _conservative_max_heap_alignment); 1606 1607 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1608 NOT_LP64(ShouldNotReachHere(); return 0); 1609 } 1610 1611 void Arguments::set_use_compressed_oops() { 1612 #ifndef ZERO 1613 #ifdef _LP64 1614 // MaxHeapSize is not set up properly at this point, but 1615 // the only value that can override MaxHeapSize if we are 1616 // to use UseCompressedOops is InitialHeapSize. 1617 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1618 1619 if (max_heap_size <= max_heap_for_compressed_oops()) { 1620 #if !defined(COMPILER1) || defined(TIERED) 1621 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1622 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1623 } 1624 #endif 1625 } else { 1626 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1627 warning("Max heap size too large for Compressed Oops"); 1628 FLAG_SET_DEFAULT(UseCompressedOops, false); 1629 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1630 } 1631 } 1632 #endif // _LP64 1633 #endif // ZERO 1634 } 1635 1636 1637 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1638 // set_use_compressed_oops(). 1639 void Arguments::set_use_compressed_klass_ptrs() { 1640 #ifndef ZERO 1641 #ifdef _LP64 1642 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1643 if (!UseCompressedOops) { 1644 if (UseCompressedClassPointers) { 1645 warning("UseCompressedClassPointers requires UseCompressedOops"); 1646 } 1647 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1648 } else { 1649 // Turn on UseCompressedClassPointers too 1650 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1651 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1652 } 1653 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1654 if (UseCompressedClassPointers) { 1655 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1656 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1657 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1658 } 1659 } 1660 } 1661 #endif // _LP64 1662 #endif // !ZERO 1663 } 1664 1665 void Arguments::set_conservative_max_heap_alignment() { 1666 // The conservative maximum required alignment for the heap is the maximum of 1667 // the alignments imposed by several sources: any requirements from the heap 1668 // itself, the collector policy and the maximum page size we may run the VM 1669 // with. 1670 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1671 _conservative_max_heap_alignment = MAX4(heap_alignment, 1672 (size_t)os::vm_allocation_granularity(), 1673 os::max_page_size(), 1674 CollectorPolicy::compute_heap_alignment()); 1675 } 1676 1677 jint Arguments::set_ergonomics_flags() { 1678 GCConfig::initialize(); 1679 1680 set_conservative_max_heap_alignment(); 1681 1682 #ifndef ZERO 1683 #ifdef _LP64 1684 set_use_compressed_oops(); 1685 1686 // set_use_compressed_klass_ptrs() must be called after calling 1687 // set_use_compressed_oops(). 1688 set_use_compressed_klass_ptrs(); 1689 1690 // Also checks that certain machines are slower with compressed oops 1691 // in vm_version initialization code. 1692 #endif // _LP64 1693 #endif // !ZERO 1694 1695 return JNI_OK; 1696 } 1697 1698 julong Arguments::limit_by_allocatable_memory(julong limit) { 1699 julong max_allocatable; 1700 julong result = limit; 1701 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1702 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1703 } 1704 return result; 1705 } 1706 1707 // Use static initialization to get the default before parsing 1708 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1709 1710 void Arguments::set_heap_size() { 1711 julong phys_mem = 1712 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1713 : (julong)MaxRAM; 1714 1715 // Convert deprecated flags 1716 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1717 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1718 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1719 1720 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1721 !FLAG_IS_DEFAULT(MinRAMFraction)) 1722 MinRAMPercentage = 100.0 / MinRAMFraction; 1723 1724 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1725 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1726 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1727 1728 // If the maximum heap size has not been set with -Xmx, 1729 // then set it as fraction of the size of physical memory, 1730 // respecting the maximum and minimum sizes of the heap. 1731 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1732 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1733 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1734 if (reasonable_min < MaxHeapSize) { 1735 // Small physical memory, so use a minimum fraction of it for the heap 1736 reasonable_max = reasonable_min; 1737 } else { 1738 // Not-small physical memory, so require a heap at least 1739 // as large as MaxHeapSize 1740 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1741 } 1742 1743 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1744 // Limit the heap size to ErgoHeapSizeLimit 1745 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1746 } 1747 if (UseCompressedOops) { 1748 // Limit the heap size to the maximum possible when using compressed oops 1749 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1750 1751 // HeapBaseMinAddress can be greater than default but not less than. 1752 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1753 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1754 // matches compressed oops printing flags 1755 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1756 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1757 DefaultHeapBaseMinAddress, 1758 DefaultHeapBaseMinAddress/G, 1759 HeapBaseMinAddress); 1760 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1761 } 1762 } 1763 1764 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1765 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1766 // but it should be not less than default MaxHeapSize. 1767 max_coop_heap -= HeapBaseMinAddress; 1768 } 1769 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1770 } 1771 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1772 1773 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1774 // An initial heap size was specified on the command line, 1775 // so be sure that the maximum size is consistent. Done 1776 // after call to limit_by_allocatable_memory because that 1777 // method might reduce the allocation size. 1778 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1779 } 1780 1781 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1782 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 1783 } 1784 1785 // If the minimum or initial heap_size have not been set or requested to be set 1786 // ergonomically, set them accordingly. 1787 if (InitialHeapSize == 0 || min_heap_size() == 0) { 1788 julong reasonable_minimum = (julong)(OldSize + NewSize); 1789 1790 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1791 1792 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1793 1794 if (InitialHeapSize == 0) { 1795 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1796 1797 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 1798 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1799 1800 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1801 1802 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 1803 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 1804 } 1805 // If the minimum heap size has not been set (via -Xms), 1806 // synchronize with InitialHeapSize to avoid errors with the default value. 1807 if (min_heap_size() == 0) { 1808 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1809 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 1810 } 1811 } 1812 } 1813 1814 // This option inspects the machine and attempts to set various 1815 // parameters to be optimal for long-running, memory allocation 1816 // intensive jobs. It is intended for machines with large 1817 // amounts of cpu and memory. 1818 jint Arguments::set_aggressive_heap_flags() { 1819 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1820 // VM, but we may not be able to represent the total physical memory 1821 // available (like having 8gb of memory on a box but using a 32bit VM). 1822 // Thus, we need to make sure we're using a julong for intermediate 1823 // calculations. 1824 julong initHeapSize; 1825 julong total_memory = os::physical_memory(); 1826 1827 if (total_memory < (julong) 256 * M) { 1828 jio_fprintf(defaultStream::error_stream(), 1829 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1830 vm_exit(1); 1831 } 1832 1833 // The heap size is half of available memory, or (at most) 1834 // all of possible memory less 160mb (leaving room for the OS 1835 // when using ISM). This is the maximum; because adaptive sizing 1836 // is turned on below, the actual space used may be smaller. 1837 1838 initHeapSize = MIN2(total_memory / (julong) 2, 1839 total_memory - (julong) 160 * M); 1840 1841 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1842 1843 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1844 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1845 return JNI_EINVAL; 1846 } 1847 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1848 return JNI_EINVAL; 1849 } 1850 // Currently the minimum size and the initial heap sizes are the same. 1851 set_min_heap_size(initHeapSize); 1852 } 1853 if (FLAG_IS_DEFAULT(NewSize)) { 1854 // Make the young generation 3/8ths of the total heap. 1855 if (FLAG_SET_CMDLINE(size_t, NewSize, 1856 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1857 return JNI_EINVAL; 1858 } 1859 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1860 return JNI_EINVAL; 1861 } 1862 } 1863 1864 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1865 FLAG_SET_DEFAULT(UseLargePages, true); 1866 #endif 1867 1868 // Increase some data structure sizes for efficiency 1869 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1870 return JNI_EINVAL; 1871 } 1872 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != JVMFlag::SUCCESS) { 1873 return JNI_EINVAL; 1874 } 1875 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1876 return JNI_EINVAL; 1877 } 1878 1879 // See the OldPLABSize comment below, but replace 'after promotion' 1880 // with 'after copying'. YoungPLABSize is the size of the survivor 1881 // space per-gc-thread buffers. The default is 4kw. 1882 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1883 return JNI_EINVAL; 1884 } 1885 1886 // OldPLABSize is the size of the buffers in the old gen that 1887 // UseParallelGC uses to promote live data that doesn't fit in the 1888 // survivor spaces. At any given time, there's one for each gc thread. 1889 // The default size is 1kw. These buffers are rarely used, since the 1890 // survivor spaces are usually big enough. For specjbb, however, there 1891 // are occasions when there's lots of live data in the young gen 1892 // and we end up promoting some of it. We don't have a definite 1893 // explanation for why bumping OldPLABSize helps, but the theory 1894 // is that a bigger PLAB results in retaining something like the 1895 // original allocation order after promotion, which improves mutator 1896 // locality. A minor effect may be that larger PLABs reduce the 1897 // number of PLAB allocation events during gc. The value of 8kw 1898 // was arrived at by experimenting with specjbb. 1899 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1900 return JNI_EINVAL; 1901 } 1902 1903 // Enable parallel GC and adaptive generation sizing 1904 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != JVMFlag::SUCCESS) { 1905 return JNI_EINVAL; 1906 } 1907 1908 // Encourage steady state memory management 1909 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1910 return JNI_EINVAL; 1911 } 1912 1913 // This appears to improve mutator locality 1914 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 1915 return JNI_EINVAL; 1916 } 1917 1918 // Get around early Solaris scheduling bug 1919 // (affinity vs other jobs on system) 1920 // but disallow DR and offlining (5008695). 1921 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != JVMFlag::SUCCESS) { 1922 return JNI_EINVAL; 1923 } 1924 1925 return JNI_OK; 1926 } 1927 1928 // This must be called after ergonomics. 1929 void Arguments::set_bytecode_flags() { 1930 if (!RewriteBytecodes) { 1931 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1932 } 1933 } 1934 1935 // Aggressive optimization flags 1936 jint Arguments::set_aggressive_opts_flags() { 1937 #ifdef COMPILER2 1938 if (AggressiveUnboxing) { 1939 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1940 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1941 } else if (!EliminateAutoBox) { 1942 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1943 AggressiveUnboxing = false; 1944 } 1945 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1946 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1947 } else if (!DoEscapeAnalysis) { 1948 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1949 AggressiveUnboxing = false; 1950 } 1951 } 1952 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1953 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1954 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1955 } 1956 // Feed the cache size setting into the JDK 1957 char buffer[1024]; 1958 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1959 if (!add_property(buffer)) { 1960 return JNI_ENOMEM; 1961 } 1962 } 1963 #endif 1964 1965 return JNI_OK; 1966 } 1967 1968 //=========================================================================================================== 1969 // Parsing of java.compiler property 1970 1971 void Arguments::process_java_compiler_argument(const char* arg) { 1972 // For backwards compatibility, Djava.compiler=NONE or "" 1973 // causes us to switch to -Xint mode UNLESS -Xdebug 1974 // is also specified. 1975 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 1976 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 1977 } 1978 } 1979 1980 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1981 _sun_java_launcher = os::strdup_check_oom(launcher); 1982 } 1983 1984 bool Arguments::created_by_java_launcher() { 1985 assert(_sun_java_launcher != NULL, "property must have value"); 1986 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1987 } 1988 1989 bool Arguments::sun_java_launcher_is_altjvm() { 1990 return _sun_java_launcher_is_altjvm; 1991 } 1992 1993 //=========================================================================================================== 1994 // Parsing of main arguments 1995 1996 unsigned int addreads_count = 0; 1997 unsigned int addexports_count = 0; 1998 unsigned int addopens_count = 0; 1999 unsigned int addmods_count = 0; 2000 unsigned int patch_mod_count = 0; 2001 2002 // Check the consistency of vm_init_args 2003 bool Arguments::check_vm_args_consistency() { 2004 // Method for adding checks for flag consistency. 2005 // The intent is to warn the user of all possible conflicts, 2006 // before returning an error. 2007 // Note: Needs platform-dependent factoring. 2008 bool status = true; 2009 2010 if (TLABRefillWasteFraction == 0) { 2011 jio_fprintf(defaultStream::error_stream(), 2012 "TLABRefillWasteFraction should be a denominator, " 2013 "not " SIZE_FORMAT "\n", 2014 TLABRefillWasteFraction); 2015 status = false; 2016 } 2017 2018 if (PrintNMTStatistics) { 2019 #if INCLUDE_NMT 2020 if (MemTracker::tracking_level() == NMT_off) { 2021 #endif // INCLUDE_NMT 2022 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2023 PrintNMTStatistics = false; 2024 #if INCLUDE_NMT 2025 } 2026 #endif 2027 } 2028 2029 status = CompilerConfig::check_args_consistency(status); 2030 #if INCLUDE_JVMCI 2031 if (status && EnableJVMCI) { 2032 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2033 AddProperty, UnwriteableProperty, InternalProperty); 2034 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2035 return false; 2036 } 2037 } 2038 #endif 2039 2040 #ifndef SUPPORT_RESERVED_STACK_AREA 2041 if (StackReservedPages != 0) { 2042 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2043 warning("Reserved Stack Area not supported on this platform"); 2044 } 2045 #endif 2046 2047 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2048 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2049 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2050 } 2051 } 2052 2053 status = status && GCArguments::check_args_consistency(); 2054 2055 if (AMD64_ONLY(false &&) !FLAG_IS_DEFAULT(ValueTypePassFieldsAsArgs)) { 2056 FLAG_SET_CMDLINE(bool, ValueTypePassFieldsAsArgs, false); 2057 warning("ValueTypePassFieldsAsArgs is not supported on this platform"); 2058 } 2059 2060 if (AMD64_ONLY(false &&) !FLAG_IS_DEFAULT(ValueTypeReturnedAsFields)) { 2061 FLAG_SET_CMDLINE(bool, ValueTypeReturnedAsFields, false); 2062 warning("ValueTypeReturnedAsFields is not supported on this platform"); 2063 } 2064 2065 if (EnableValhalla) { 2066 if (!EnableValhallaC1) { 2067 // C1 support for value types is incomplete. Don't use it by default. 2068 if (!FLAG_IS_DEFAULT(TieredCompilation)) { 2069 warning("TieredCompilation disabled because value types are not supported by C1"); 2070 } 2071 FLAG_SET_CMDLINE(bool, TieredCompilation, false); 2072 } else { 2073 if (TieredStopAtLevel > 1) { 2074 warning("C1 doesn't work with C2 yet. Forcing TieredStopAtLevel=1"); 2075 FLAG_SET_CMDLINE(intx, TieredStopAtLevel, 1); 2076 } 2077 if (ValueTypePassFieldsAsArgs) { 2078 warning("C1 doesn't work with ValueTypePassFieldsAsArgs yet. Forcing ValueTypePassFieldsAsArgs=false"); 2079 FLAG_SET_CMDLINE(bool, ValueTypePassFieldsAsArgs, false); 2080 } 2081 if (ValueTypeReturnedAsFields) { 2082 warning("C1 doesn't work with ValueTypeReturnedAsFields yet. Forcing ValueTypeReturnedAsFields=false"); 2083 FLAG_SET_CMDLINE(bool, ValueTypeReturnedAsFields, false); 2084 } 2085 } 2086 } 2087 if (!EnableValhalla && ACmpOnValues != 3) { 2088 FLAG_SET_CMDLINE(uint, ACmpOnValues, 0); 2089 } 2090 return status; 2091 } 2092 2093 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2094 const char* option_type) { 2095 if (ignore) return false; 2096 2097 const char* spacer = " "; 2098 if (option_type == NULL) { 2099 option_type = ++spacer; // Set both to the empty string. 2100 } 2101 2102 jio_fprintf(defaultStream::error_stream(), 2103 "Unrecognized %s%soption: %s\n", option_type, spacer, 2104 option->optionString); 2105 return true; 2106 } 2107 2108 static const char* user_assertion_options[] = { 2109 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2110 }; 2111 2112 static const char* system_assertion_options[] = { 2113 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2114 }; 2115 2116 bool Arguments::parse_uintx(const char* value, 2117 uintx* uintx_arg, 2118 uintx min_size) { 2119 2120 // Check the sign first since atojulong() parses only unsigned values. 2121 bool value_is_positive = !(*value == '-'); 2122 2123 if (value_is_positive) { 2124 julong n; 2125 bool good_return = atojulong(value, &n); 2126 if (good_return) { 2127 bool above_minimum = n >= min_size; 2128 bool value_is_too_large = n > max_uintx; 2129 2130 if (above_minimum && !value_is_too_large) { 2131 *uintx_arg = n; 2132 return true; 2133 } 2134 } 2135 } 2136 return false; 2137 } 2138 2139 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2140 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2141 char* property = AllocateHeap(prop_len, mtArguments); 2142 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2143 if (ret < 0 || ret >= (int)prop_len) { 2144 FreeHeap(property); 2145 return false; 2146 } 2147 bool added = add_property(property, UnwriteableProperty, internal); 2148 FreeHeap(property); 2149 return added; 2150 } 2151 2152 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2153 const unsigned int props_count_limit = 1000; 2154 const int max_digits = 3; 2155 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2156 2157 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2158 if (count < props_count_limit) { 2159 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2160 char* property = AllocateHeap(prop_len, mtArguments); 2161 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2162 if (ret < 0 || ret >= (int)prop_len) { 2163 FreeHeap(property); 2164 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2165 return false; 2166 } 2167 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2168 FreeHeap(property); 2169 return added; 2170 } 2171 2172 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2173 return false; 2174 } 2175 2176 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2177 julong* long_arg, 2178 julong min_size, 2179 julong max_size) { 2180 if (!atojulong(s, long_arg)) return arg_unreadable; 2181 return check_memory_size(*long_arg, min_size, max_size); 2182 } 2183 2184 // Parse JavaVMInitArgs structure 2185 2186 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2187 const JavaVMInitArgs *java_options_args, 2188 const JavaVMInitArgs *cmd_line_args) { 2189 bool patch_mod_javabase = false; 2190 2191 // Save default settings for some mode flags 2192 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2193 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2194 Arguments::_ClipInlining = ClipInlining; 2195 Arguments::_BackgroundCompilation = BackgroundCompilation; 2196 if (TieredCompilation) { 2197 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2198 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2199 } 2200 2201 // Setup flags for mixed which is the default 2202 set_mode_flags(_mixed); 2203 2204 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2205 // variable (if present). 2206 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2207 if (result != JNI_OK) { 2208 return result; 2209 } 2210 2211 // Parse args structure generated from the command line flags. 2212 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE); 2213 if (result != JNI_OK) { 2214 return result; 2215 } 2216 2217 // Parse args structure generated from the _JAVA_OPTIONS environment 2218 // variable (if present) (mimics classic VM) 2219 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2220 if (result != JNI_OK) { 2221 return result; 2222 } 2223 2224 // We need to ensure processor and memory resources have been properly 2225 // configured - which may rely on arguments we just processed - before 2226 // doing the final argument processing. Any argument processing that 2227 // needs to know about processor and memory resources must occur after 2228 // this point. 2229 2230 os::init_container_support(); 2231 2232 // Do final processing now that all arguments have been parsed 2233 result = finalize_vm_init_args(patch_mod_javabase); 2234 if (result != JNI_OK) { 2235 return result; 2236 } 2237 2238 return JNI_OK; 2239 } 2240 2241 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2242 // represents a valid JDWP agent. is_path==true denotes that we 2243 // are dealing with -agentpath (case where name is a path), otherwise with 2244 // -agentlib 2245 bool valid_jdwp_agent(char *name, bool is_path) { 2246 char *_name; 2247 const char *_jdwp = "jdwp"; 2248 size_t _len_jdwp, _len_prefix; 2249 2250 if (is_path) { 2251 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2252 return false; 2253 } 2254 2255 _name++; // skip past last path separator 2256 _len_prefix = strlen(JNI_LIB_PREFIX); 2257 2258 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2259 return false; 2260 } 2261 2262 _name += _len_prefix; 2263 _len_jdwp = strlen(_jdwp); 2264 2265 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2266 _name += _len_jdwp; 2267 } 2268 else { 2269 return false; 2270 } 2271 2272 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2273 return false; 2274 } 2275 2276 return true; 2277 } 2278 2279 if (strcmp(name, _jdwp) == 0) { 2280 return true; 2281 } 2282 2283 return false; 2284 } 2285 2286 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2287 // --patch-module=<module>=<file>(<pathsep><file>)* 2288 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2289 // Find the equal sign between the module name and the path specification 2290 const char* module_equal = strchr(patch_mod_tail, '='); 2291 if (module_equal == NULL) { 2292 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2293 return JNI_ERR; 2294 } else { 2295 // Pick out the module name 2296 size_t module_len = module_equal - patch_mod_tail; 2297 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2298 if (module_name != NULL) { 2299 memcpy(module_name, patch_mod_tail, module_len); 2300 *(module_name + module_len) = '\0'; 2301 // The path piece begins one past the module_equal sign 2302 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2303 FREE_C_HEAP_ARRAY(char, module_name); 2304 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2305 return JNI_ENOMEM; 2306 } 2307 } else { 2308 return JNI_ENOMEM; 2309 } 2310 } 2311 return JNI_OK; 2312 } 2313 2314 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2315 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2316 // The min and max sizes match the values in globals.hpp, but scaled 2317 // with K. The values have been chosen so that alignment with page 2318 // size doesn't change the max value, which makes the conversions 2319 // back and forth between Xss value and ThreadStackSize value easier. 2320 // The values have also been chosen to fit inside a 32-bit signed type. 2321 const julong min_ThreadStackSize = 0; 2322 const julong max_ThreadStackSize = 1 * M; 2323 2324 const julong min_size = min_ThreadStackSize * K; 2325 const julong max_size = max_ThreadStackSize * K; 2326 2327 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2328 2329 julong size = 0; 2330 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2331 if (errcode != arg_in_range) { 2332 bool silent = (option == NULL); // Allow testing to silence error messages 2333 if (!silent) { 2334 jio_fprintf(defaultStream::error_stream(), 2335 "Invalid thread stack size: %s\n", option->optionString); 2336 describe_range_error(errcode); 2337 } 2338 return JNI_EINVAL; 2339 } 2340 2341 // Internally track ThreadStackSize in units of 1024 bytes. 2342 const julong size_aligned = align_up(size, K); 2343 assert(size <= size_aligned, 2344 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2345 size, size_aligned); 2346 2347 const julong size_in_K = size_aligned / K; 2348 assert(size_in_K < (julong)max_intx, 2349 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2350 size_in_K); 2351 2352 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2353 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2354 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2355 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2356 max_expanded, size_in_K); 2357 2358 *out_ThreadStackSize = (intx)size_in_K; 2359 2360 return JNI_OK; 2361 } 2362 2363 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) { 2364 // For match_option to return remaining or value part of option string 2365 const char* tail; 2366 2367 // iterate over arguments 2368 for (int index = 0; index < args->nOptions; index++) { 2369 bool is_absolute_path = false; // for -agentpath vs -agentlib 2370 2371 const JavaVMOption* option = args->options + index; 2372 2373 if (!match_option(option, "-Djava.class.path", &tail) && 2374 !match_option(option, "-Dsun.java.command", &tail) && 2375 !match_option(option, "-Dsun.java.launcher", &tail)) { 2376 2377 // add all jvm options to the jvm_args string. This string 2378 // is used later to set the java.vm.args PerfData string constant. 2379 // the -Djava.class.path and the -Dsun.java.command options are 2380 // omitted from jvm_args string as each have their own PerfData 2381 // string constant object. 2382 build_jvm_args(option->optionString); 2383 } 2384 2385 // -verbose:[class/module/gc/jni] 2386 if (match_option(option, "-verbose", &tail)) { 2387 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2388 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2389 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2390 } else if (!strcmp(tail, ":module")) { 2391 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2392 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2393 } else if (!strcmp(tail, ":gc")) { 2394 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2395 } else if (!strcmp(tail, ":jni")) { 2396 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != JVMFlag::SUCCESS) { 2397 return JNI_EINVAL; 2398 } 2399 } 2400 // -da / -ea / -disableassertions / -enableassertions 2401 // These accept an optional class/package name separated by a colon, e.g., 2402 // -da:java.lang.Thread. 2403 } else if (match_option(option, user_assertion_options, &tail, true)) { 2404 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2405 if (*tail == '\0') { 2406 JavaAssertions::setUserClassDefault(enable); 2407 } else { 2408 assert(*tail == ':', "bogus match by match_option()"); 2409 JavaAssertions::addOption(tail + 1, enable); 2410 } 2411 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2412 } else if (match_option(option, system_assertion_options, &tail, false)) { 2413 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2414 JavaAssertions::setSystemClassDefault(enable); 2415 // -bootclasspath: 2416 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2417 jio_fprintf(defaultStream::output_stream(), 2418 "-Xbootclasspath is no longer a supported option.\n"); 2419 return JNI_EINVAL; 2420 // -bootclasspath/a: 2421 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2422 Arguments::append_sysclasspath(tail); 2423 // -bootclasspath/p: 2424 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2425 jio_fprintf(defaultStream::output_stream(), 2426 "-Xbootclasspath/p is no longer a supported option.\n"); 2427 return JNI_EINVAL; 2428 // -Xrun 2429 } else if (match_option(option, "-Xrun", &tail)) { 2430 if (tail != NULL) { 2431 const char* pos = strchr(tail, ':'); 2432 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2433 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2434 jio_snprintf(name, len + 1, "%s", tail); 2435 2436 char *options = NULL; 2437 if(pos != NULL) { 2438 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2439 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2440 } 2441 #if !INCLUDE_JVMTI 2442 if (strcmp(name, "jdwp") == 0) { 2443 jio_fprintf(defaultStream::error_stream(), 2444 "Debugging agents are not supported in this VM\n"); 2445 return JNI_ERR; 2446 } 2447 #endif // !INCLUDE_JVMTI 2448 add_init_library(name, options); 2449 } 2450 } else if (match_option(option, "--add-reads=", &tail)) { 2451 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2452 return JNI_ENOMEM; 2453 } 2454 } else if (match_option(option, "--add-exports=", &tail)) { 2455 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2456 return JNI_ENOMEM; 2457 } 2458 } else if (match_option(option, "--add-opens=", &tail)) { 2459 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2460 return JNI_ENOMEM; 2461 } 2462 } else if (match_option(option, "--add-modules=", &tail)) { 2463 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2464 return JNI_ENOMEM; 2465 } 2466 } else if (match_option(option, "--limit-modules=", &tail)) { 2467 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2468 return JNI_ENOMEM; 2469 } 2470 } else if (match_option(option, "--module-path=", &tail)) { 2471 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2472 return JNI_ENOMEM; 2473 } 2474 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2475 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2476 return JNI_ENOMEM; 2477 } 2478 } else if (match_option(option, "--patch-module=", &tail)) { 2479 // --patch-module=<module>=<file>(<pathsep><file>)* 2480 int res = process_patch_mod_option(tail, patch_mod_javabase); 2481 if (res != JNI_OK) { 2482 return res; 2483 } 2484 } else if (match_option(option, "--illegal-access=", &tail)) { 2485 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2486 return JNI_ENOMEM; 2487 } 2488 // -agentlib and -agentpath 2489 } else if (match_option(option, "-agentlib:", &tail) || 2490 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2491 if(tail != NULL) { 2492 const char* pos = strchr(tail, '='); 2493 char* name; 2494 if (pos == NULL) { 2495 name = os::strdup_check_oom(tail, mtArguments); 2496 } else { 2497 size_t len = pos - tail; 2498 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2499 memcpy(name, tail, len); 2500 name[len] = '\0'; 2501 } 2502 2503 char *options = NULL; 2504 if(pos != NULL) { 2505 options = os::strdup_check_oom(pos + 1, mtArguments); 2506 } 2507 #if !INCLUDE_JVMTI 2508 if (valid_jdwp_agent(name, is_absolute_path)) { 2509 jio_fprintf(defaultStream::error_stream(), 2510 "Debugging agents are not supported in this VM\n"); 2511 return JNI_ERR; 2512 } 2513 #endif // !INCLUDE_JVMTI 2514 add_init_agent(name, options, is_absolute_path); 2515 } 2516 // -javaagent 2517 } else if (match_option(option, "-javaagent:", &tail)) { 2518 #if !INCLUDE_JVMTI 2519 jio_fprintf(defaultStream::error_stream(), 2520 "Instrumentation agents are not supported in this VM\n"); 2521 return JNI_ERR; 2522 #else 2523 if (tail != NULL) { 2524 size_t length = strlen(tail) + 1; 2525 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2526 jio_snprintf(options, length, "%s", tail); 2527 add_instrument_agent("instrument", options, false); 2528 // java agents need module java.instrument 2529 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2530 return JNI_ENOMEM; 2531 } 2532 } 2533 #endif // !INCLUDE_JVMTI 2534 // --enable_preview 2535 } else if (match_option(option, "--enable-preview")) { 2536 set_enable_preview(); 2537 // -Xnoclassgc 2538 } else if (match_option(option, "-Xnoclassgc")) { 2539 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != JVMFlag::SUCCESS) { 2540 return JNI_EINVAL; 2541 } 2542 // -Xconcgc 2543 } else if (match_option(option, "-Xconcgc")) { 2544 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != JVMFlag::SUCCESS) { 2545 return JNI_EINVAL; 2546 } 2547 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2548 // -Xnoconcgc 2549 } else if (match_option(option, "-Xnoconcgc")) { 2550 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != JVMFlag::SUCCESS) { 2551 return JNI_EINVAL; 2552 } 2553 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2554 // -Xbatch 2555 } else if (match_option(option, "-Xbatch")) { 2556 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2557 return JNI_EINVAL; 2558 } 2559 // -Xmn for compatibility with other JVM vendors 2560 } else if (match_option(option, "-Xmn", &tail)) { 2561 julong long_initial_young_size = 0; 2562 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2563 if (errcode != arg_in_range) { 2564 jio_fprintf(defaultStream::error_stream(), 2565 "Invalid initial young generation size: %s\n", option->optionString); 2566 describe_range_error(errcode); 2567 return JNI_EINVAL; 2568 } 2569 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2570 return JNI_EINVAL; 2571 } 2572 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2573 return JNI_EINVAL; 2574 } 2575 // -Xms 2576 } else if (match_option(option, "-Xms", &tail)) { 2577 julong long_initial_heap_size = 0; 2578 // an initial heap size of 0 means automatically determine 2579 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2580 if (errcode != arg_in_range) { 2581 jio_fprintf(defaultStream::error_stream(), 2582 "Invalid initial heap size: %s\n", option->optionString); 2583 describe_range_error(errcode); 2584 return JNI_EINVAL; 2585 } 2586 set_min_heap_size((size_t)long_initial_heap_size); 2587 // Currently the minimum size and the initial heap sizes are the same. 2588 // Can be overridden with -XX:InitialHeapSize. 2589 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != JVMFlag::SUCCESS) { 2590 return JNI_EINVAL; 2591 } 2592 // -Xmx 2593 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2594 julong long_max_heap_size = 0; 2595 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2596 if (errcode != arg_in_range) { 2597 jio_fprintf(defaultStream::error_stream(), 2598 "Invalid maximum heap size: %s\n", option->optionString); 2599 describe_range_error(errcode); 2600 return JNI_EINVAL; 2601 } 2602 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2603 return JNI_EINVAL; 2604 } 2605 // Xmaxf 2606 } else if (match_option(option, "-Xmaxf", &tail)) { 2607 char* err; 2608 int maxf = (int)(strtod(tail, &err) * 100); 2609 if (*err != '\0' || *tail == '\0') { 2610 jio_fprintf(defaultStream::error_stream(), 2611 "Bad max heap free percentage size: %s\n", 2612 option->optionString); 2613 return JNI_EINVAL; 2614 } else { 2615 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2616 return JNI_EINVAL; 2617 } 2618 } 2619 // Xminf 2620 } else if (match_option(option, "-Xminf", &tail)) { 2621 char* err; 2622 int minf = (int)(strtod(tail, &err) * 100); 2623 if (*err != '\0' || *tail == '\0') { 2624 jio_fprintf(defaultStream::error_stream(), 2625 "Bad min heap free percentage size: %s\n", 2626 option->optionString); 2627 return JNI_EINVAL; 2628 } else { 2629 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2630 return JNI_EINVAL; 2631 } 2632 } 2633 // -Xss 2634 } else if (match_option(option, "-Xss", &tail)) { 2635 intx value = 0; 2636 jint err = parse_xss(option, tail, &value); 2637 if (err != JNI_OK) { 2638 return err; 2639 } 2640 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, value) != JVMFlag::SUCCESS) { 2641 return JNI_EINVAL; 2642 } 2643 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2644 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2645 julong long_ReservedCodeCacheSize = 0; 2646 2647 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2648 if (errcode != arg_in_range) { 2649 jio_fprintf(defaultStream::error_stream(), 2650 "Invalid maximum code cache size: %s.\n", option->optionString); 2651 return JNI_EINVAL; 2652 } 2653 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2654 return JNI_EINVAL; 2655 } 2656 // -green 2657 } else if (match_option(option, "-green")) { 2658 jio_fprintf(defaultStream::error_stream(), 2659 "Green threads support not available\n"); 2660 return JNI_EINVAL; 2661 // -native 2662 } else if (match_option(option, "-native")) { 2663 // HotSpot always uses native threads, ignore silently for compatibility 2664 // -Xrs 2665 } else if (match_option(option, "-Xrs")) { 2666 // Classic/EVM option, new functionality 2667 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2668 return JNI_EINVAL; 2669 } 2670 // -Xprof 2671 } else if (match_option(option, "-Xprof")) { 2672 char version[256]; 2673 // Obsolete in JDK 10 2674 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2675 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2676 // -Xinternalversion 2677 } else if (match_option(option, "-Xinternalversion")) { 2678 jio_fprintf(defaultStream::output_stream(), "%s\n", 2679 VM_Version::internal_vm_info_string()); 2680 vm_exit(0); 2681 #ifndef PRODUCT 2682 // -Xprintflags 2683 } else if (match_option(option, "-Xprintflags")) { 2684 JVMFlag::printFlags(tty, false); 2685 vm_exit(0); 2686 #endif 2687 // -D 2688 } else if (match_option(option, "-D", &tail)) { 2689 const char* value; 2690 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2691 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2692 // abort if -Djava.endorsed.dirs is set 2693 jio_fprintf(defaultStream::output_stream(), 2694 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2695 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2696 return JNI_EINVAL; 2697 } 2698 if (match_option(option, "-Djava.ext.dirs=", &value) && 2699 *value != '\0' && strcmp(value, "\"\"") != 0) { 2700 // abort if -Djava.ext.dirs is set 2701 jio_fprintf(defaultStream::output_stream(), 2702 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2703 return JNI_EINVAL; 2704 } 2705 // Check for module related properties. They must be set using the modules 2706 // options. For example: use "--add-modules=java.sql", not 2707 // "-Djdk.module.addmods=java.sql" 2708 if (is_internal_module_property(option->optionString + 2)) { 2709 needs_module_property_warning = true; 2710 continue; 2711 } 2712 2713 if (!add_property(tail)) { 2714 return JNI_ENOMEM; 2715 } 2716 // Out of the box management support 2717 if (match_option(option, "-Dcom.sun.management", &tail)) { 2718 #if INCLUDE_MANAGEMENT 2719 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != JVMFlag::SUCCESS) { 2720 return JNI_EINVAL; 2721 } 2722 // management agent in module jdk.management.agent 2723 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2724 return JNI_ENOMEM; 2725 } 2726 #else 2727 jio_fprintf(defaultStream::output_stream(), 2728 "-Dcom.sun.management is not supported in this VM.\n"); 2729 return JNI_ERR; 2730 #endif 2731 } 2732 // -Xint 2733 } else if (match_option(option, "-Xint")) { 2734 set_mode_flags(_int); 2735 // -Xmixed 2736 } else if (match_option(option, "-Xmixed")) { 2737 set_mode_flags(_mixed); 2738 // -Xcomp 2739 } else if (match_option(option, "-Xcomp")) { 2740 // for testing the compiler; turn off all flags that inhibit compilation 2741 set_mode_flags(_comp); 2742 // -Xshare:dump 2743 } else if (match_option(option, "-Xshare:dump")) { 2744 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != JVMFlag::SUCCESS) { 2745 return JNI_EINVAL; 2746 } 2747 set_mode_flags(_int); // Prevent compilation, which creates objects 2748 // -Xshare:on 2749 } else if (match_option(option, "-Xshare:on")) { 2750 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2751 return JNI_EINVAL; 2752 } 2753 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2754 return JNI_EINVAL; 2755 } 2756 // -Xshare:auto 2757 } else if (match_option(option, "-Xshare:auto")) { 2758 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2759 return JNI_EINVAL; 2760 } 2761 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2762 return JNI_EINVAL; 2763 } 2764 // -Xshare:off 2765 } else if (match_option(option, "-Xshare:off")) { 2766 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != JVMFlag::SUCCESS) { 2767 return JNI_EINVAL; 2768 } 2769 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2770 return JNI_EINVAL; 2771 } 2772 // -Xverify 2773 } else if (match_option(option, "-Xverify", &tail)) { 2774 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2775 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2776 return JNI_EINVAL; 2777 } 2778 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2779 return JNI_EINVAL; 2780 } 2781 } else if (strcmp(tail, ":remote") == 0) { 2782 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2783 return JNI_EINVAL; 2784 } 2785 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2786 return JNI_EINVAL; 2787 } 2788 } else if (strcmp(tail, ":none") == 0) { 2789 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2790 return JNI_EINVAL; 2791 } 2792 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2793 return JNI_EINVAL; 2794 } 2795 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2796 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2797 return JNI_EINVAL; 2798 } 2799 // -Xdebug 2800 } else if (match_option(option, "-Xdebug")) { 2801 // note this flag has been used, then ignore 2802 set_xdebug_mode(true); 2803 // -Xnoagent 2804 } else if (match_option(option, "-Xnoagent")) { 2805 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2806 } else if (match_option(option, "-Xloggc:", &tail)) { 2807 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2808 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2809 _gc_log_filename = os::strdup_check_oom(tail); 2810 } else if (match_option(option, "-Xlog", &tail)) { 2811 bool ret = false; 2812 if (strcmp(tail, ":help") == 0) { 2813 fileStream stream(defaultStream::output_stream()); 2814 LogConfiguration::print_command_line_help(&stream); 2815 vm_exit(0); 2816 } else if (strcmp(tail, ":disable") == 0) { 2817 LogConfiguration::disable_logging(); 2818 ret = true; 2819 } else if (*tail == '\0') { 2820 ret = LogConfiguration::parse_command_line_arguments(); 2821 assert(ret, "-Xlog without arguments should never fail to parse"); 2822 } else if (*tail == ':') { 2823 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2824 } 2825 if (ret == false) { 2826 jio_fprintf(defaultStream::error_stream(), 2827 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2828 tail); 2829 return JNI_EINVAL; 2830 } 2831 // JNI hooks 2832 } else if (match_option(option, "-Xcheck", &tail)) { 2833 if (!strcmp(tail, ":jni")) { 2834 #if !INCLUDE_JNI_CHECK 2835 warning("JNI CHECKING is not supported in this VM"); 2836 #else 2837 CheckJNICalls = true; 2838 #endif // INCLUDE_JNI_CHECK 2839 } else if (is_bad_option(option, args->ignoreUnrecognized, 2840 "check")) { 2841 return JNI_EINVAL; 2842 } 2843 } else if (match_option(option, "vfprintf")) { 2844 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2845 } else if (match_option(option, "exit")) { 2846 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2847 } else if (match_option(option, "abort")) { 2848 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2849 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2850 // and the last option wins. 2851 } else if (match_option(option, "-XX:+NeverTenure")) { 2852 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != JVMFlag::SUCCESS) { 2853 return JNI_EINVAL; 2854 } 2855 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) { 2856 return JNI_EINVAL; 2857 } 2858 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != JVMFlag::SUCCESS) { 2859 return JNI_EINVAL; 2860 } 2861 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2862 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) { 2863 return JNI_EINVAL; 2864 } 2865 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) { 2866 return JNI_EINVAL; 2867 } 2868 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2869 return JNI_EINVAL; 2870 } 2871 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2872 uintx max_tenuring_thresh = 0; 2873 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2874 jio_fprintf(defaultStream::error_stream(), 2875 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2876 return JNI_EINVAL; 2877 } 2878 2879 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2880 return JNI_EINVAL; 2881 } 2882 2883 if (MaxTenuringThreshold == 0) { 2884 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) { 2885 return JNI_EINVAL; 2886 } 2887 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != JVMFlag::SUCCESS) { 2888 return JNI_EINVAL; 2889 } 2890 } else { 2891 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != JVMFlag::SUCCESS) { 2892 return JNI_EINVAL; 2893 } 2894 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != JVMFlag::SUCCESS) { 2895 return JNI_EINVAL; 2896 } 2897 } 2898 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2899 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2900 return JNI_EINVAL; 2901 } 2902 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2903 return JNI_EINVAL; 2904 } 2905 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2906 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2907 return JNI_EINVAL; 2908 } 2909 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2910 return JNI_EINVAL; 2911 } 2912 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 2913 #if defined(DTRACE_ENABLED) 2914 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 2915 return JNI_EINVAL; 2916 } 2917 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 2918 return JNI_EINVAL; 2919 } 2920 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 2921 return JNI_EINVAL; 2922 } 2923 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 2924 return JNI_EINVAL; 2925 } 2926 #else // defined(DTRACE_ENABLED) 2927 jio_fprintf(defaultStream::error_stream(), 2928 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 2929 return JNI_EINVAL; 2930 #endif // defined(DTRACE_ENABLED) 2931 #ifdef ASSERT 2932 } else if (match_option(option, "-XX:+FullGCALot")) { 2933 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != JVMFlag::SUCCESS) { 2934 return JNI_EINVAL; 2935 } 2936 // disable scavenge before parallel mark-compact 2937 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2938 return JNI_EINVAL; 2939 } 2940 #endif 2941 #if !INCLUDE_MANAGEMENT 2942 } else if (match_option(option, "-XX:+ManagementServer")) { 2943 jio_fprintf(defaultStream::error_stream(), 2944 "ManagementServer is not supported in this VM.\n"); 2945 return JNI_ERR; 2946 #endif // INCLUDE_MANAGEMENT 2947 #if INCLUDE_JFR 2948 } else if (match_jfr_option(&option)) { 2949 return JNI_EINVAL; 2950 #endif 2951 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2952 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2953 // already been handled 2954 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2955 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2956 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2957 return JNI_EINVAL; 2958 } 2959 } 2960 // Unknown option 2961 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2962 return JNI_ERR; 2963 } 2964 } 2965 2966 if (EnableValhalla) { 2967 if (!create_property("valhalla.enableValhalla", "true", InternalProperty)) { 2968 return JNI_ENOMEM; 2969 } 2970 } 2971 2972 // PrintSharedArchiveAndExit will turn on 2973 // -Xshare:on 2974 // -Xlog:class+path=info 2975 if (PrintSharedArchiveAndExit) { 2976 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2977 return JNI_EINVAL; 2978 } 2979 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2980 return JNI_EINVAL; 2981 } 2982 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2983 } 2984 2985 // Change the default value for flags which have different default values 2986 // when working with older JDKs. 2987 #ifdef LINUX 2988 if (JDK_Version::current().compare_major(6) <= 0 && 2989 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 2990 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 2991 } 2992 #endif // LINUX 2993 fix_appclasspath(); 2994 2995 return JNI_OK; 2996 } 2997 2998 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 2999 // For java.base check for duplicate --patch-module options being specified on the command line. 3000 // This check is only required for java.base, all other duplicate module specifications 3001 // will be checked during module system initialization. The module system initialization 3002 // will throw an ExceptionInInitializerError if this situation occurs. 3003 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3004 if (*patch_mod_javabase) { 3005 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3006 } else { 3007 *patch_mod_javabase = true; 3008 } 3009 } 3010 3011 // Create GrowableArray lazily, only if --patch-module has been specified 3012 if (_patch_mod_prefix == NULL) { 3013 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3014 } 3015 3016 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3017 } 3018 3019 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3020 // 3021 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3022 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3023 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3024 // path is treated as the current directory. 3025 // 3026 // This causes problems with CDS, which requires that all directories specified in the classpath 3027 // must be empty. In most cases, applications do NOT want to load classes from the current 3028 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3029 // scripts compatible with CDS. 3030 void Arguments::fix_appclasspath() { 3031 if (IgnoreEmptyClassPaths) { 3032 const char separator = *os::path_separator(); 3033 const char* src = _java_class_path->value(); 3034 3035 // skip over all the leading empty paths 3036 while (*src == separator) { 3037 src ++; 3038 } 3039 3040 char* copy = os::strdup_check_oom(src, mtArguments); 3041 3042 // trim all trailing empty paths 3043 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3044 *tail = '\0'; 3045 } 3046 3047 char from[3] = {separator, separator, '\0'}; 3048 char to [2] = {separator, '\0'}; 3049 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3050 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3051 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3052 } 3053 3054 _java_class_path->set_writeable_value(copy); 3055 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3056 } 3057 } 3058 3059 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3060 // check if the default lib/endorsed directory exists; if so, error 3061 char path[JVM_MAXPATHLEN]; 3062 const char* fileSep = os::file_separator(); 3063 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3064 3065 DIR* dir = os::opendir(path); 3066 if (dir != NULL) { 3067 jio_fprintf(defaultStream::output_stream(), 3068 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3069 "in modular form will be supported via the concept of upgradeable modules.\n"); 3070 os::closedir(dir); 3071 return JNI_ERR; 3072 } 3073 3074 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3075 dir = os::opendir(path); 3076 if (dir != NULL) { 3077 jio_fprintf(defaultStream::output_stream(), 3078 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3079 "Use -classpath instead.\n."); 3080 os::closedir(dir); 3081 return JNI_ERR; 3082 } 3083 3084 // This must be done after all arguments have been processed 3085 // and the container support has been initialized since AggressiveHeap 3086 // relies on the amount of total memory available. 3087 if (AggressiveHeap) { 3088 jint result = set_aggressive_heap_flags(); 3089 if (result != JNI_OK) { 3090 return result; 3091 } 3092 } 3093 3094 // This must be done after all arguments have been processed. 3095 // java_compiler() true means set to "NONE" or empty. 3096 if (java_compiler() && !xdebug_mode()) { 3097 // For backwards compatibility, we switch to interpreted mode if 3098 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3099 // not specified. 3100 set_mode_flags(_int); 3101 } 3102 3103 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3104 // but like -Xint, leave compilation thresholds unaffected. 3105 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3106 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3107 set_mode_flags(_int); 3108 } 3109 3110 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3111 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3112 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3113 } 3114 3115 #if !COMPILER2_OR_JVMCI 3116 // Don't degrade server performance for footprint 3117 if (FLAG_IS_DEFAULT(UseLargePages) && 3118 MaxHeapSize < LargePageHeapSizeThreshold) { 3119 // No need for large granularity pages w/small heaps. 3120 // Note that large pages are enabled/disabled for both the 3121 // Java heap and the code cache. 3122 FLAG_SET_DEFAULT(UseLargePages, false); 3123 } 3124 3125 UNSUPPORTED_OPTION(ProfileInterpreter); 3126 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3127 #endif 3128 3129 #ifndef TIERED 3130 // Tiered compilation is undefined. 3131 UNSUPPORTED_OPTION(TieredCompilation); 3132 #endif 3133 3134 if (!check_vm_args_consistency()) { 3135 return JNI_ERR; 3136 } 3137 3138 #if INCLUDE_CDS 3139 if (DumpSharedSpaces) { 3140 // Disable biased locking now as it interferes with the clean up of 3141 // the archived Klasses and Java string objects (at dump time only). 3142 UseBiasedLocking = false; 3143 3144 // Always verify non-system classes during CDS dump 3145 if (!BytecodeVerificationRemote) { 3146 BytecodeVerificationRemote = true; 3147 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3148 } 3149 3150 // Compilation is already disabled if the user specifies -Xshare:dump. 3151 // Disable compilation in case user specifies -XX:+DumpSharedSpaces instead of -Xshare:dump. 3152 set_mode_flags(_int); 3153 } 3154 if (UseSharedSpaces && patch_mod_javabase) { 3155 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3156 } 3157 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3158 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3159 } 3160 #endif 3161 3162 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3163 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3164 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3165 3166 return JNI_OK; 3167 } 3168 3169 // Helper class for controlling the lifetime of JavaVMInitArgs 3170 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3171 // deleted on the destruction of the ScopedVMInitArgs object. 3172 class ScopedVMInitArgs : public StackObj { 3173 private: 3174 JavaVMInitArgs _args; 3175 char* _container_name; 3176 bool _is_set; 3177 char* _vm_options_file_arg; 3178 3179 public: 3180 ScopedVMInitArgs(const char *container_name) { 3181 _args.version = JNI_VERSION_1_2; 3182 _args.nOptions = 0; 3183 _args.options = NULL; 3184 _args.ignoreUnrecognized = false; 3185 _container_name = (char *)container_name; 3186 _is_set = false; 3187 _vm_options_file_arg = NULL; 3188 } 3189 3190 // Populates the JavaVMInitArgs object represented by this 3191 // ScopedVMInitArgs object with the arguments in options. The 3192 // allocated memory is deleted by the destructor. If this method 3193 // returns anything other than JNI_OK, then this object is in a 3194 // partially constructed state, and should be abandoned. 3195 jint set_args(GrowableArray<JavaVMOption>* options) { 3196 _is_set = true; 3197 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3198 JavaVMOption, options->length(), mtArguments); 3199 if (options_arr == NULL) { 3200 return JNI_ENOMEM; 3201 } 3202 _args.options = options_arr; 3203 3204 for (int i = 0; i < options->length(); i++) { 3205 options_arr[i] = options->at(i); 3206 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3207 if (options_arr[i].optionString == NULL) { 3208 // Rely on the destructor to do cleanup. 3209 _args.nOptions = i; 3210 return JNI_ENOMEM; 3211 } 3212 } 3213 3214 _args.nOptions = options->length(); 3215 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3216 return JNI_OK; 3217 } 3218 3219 JavaVMInitArgs* get() { return &_args; } 3220 char* container_name() { return _container_name; } 3221 bool is_set() { return _is_set; } 3222 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3223 char* vm_options_file_arg() { return _vm_options_file_arg; } 3224 3225 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3226 if (_vm_options_file_arg != NULL) { 3227 os::free(_vm_options_file_arg); 3228 } 3229 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3230 } 3231 3232 ~ScopedVMInitArgs() { 3233 if (_vm_options_file_arg != NULL) { 3234 os::free(_vm_options_file_arg); 3235 } 3236 if (_args.options == NULL) return; 3237 for (int i = 0; i < _args.nOptions; i++) { 3238 os::free(_args.options[i].optionString); 3239 } 3240 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3241 } 3242 3243 // Insert options into this option list, to replace option at 3244 // vm_options_file_pos (-XX:VMOptionsFile) 3245 jint insert(const JavaVMInitArgs* args, 3246 const JavaVMInitArgs* args_to_insert, 3247 const int vm_options_file_pos) { 3248 assert(_args.options == NULL, "shouldn't be set yet"); 3249 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3250 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3251 3252 int length = args->nOptions + args_to_insert->nOptions - 1; 3253 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3254 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3255 for (int i = 0; i < args->nOptions; i++) { 3256 if (i == vm_options_file_pos) { 3257 // insert the new options starting at the same place as the 3258 // -XX:VMOptionsFile option 3259 for (int j = 0; j < args_to_insert->nOptions; j++) { 3260 options->push(args_to_insert->options[j]); 3261 } 3262 } else { 3263 options->push(args->options[i]); 3264 } 3265 } 3266 // make into options array 3267 jint result = set_args(options); 3268 delete options; 3269 return result; 3270 } 3271 }; 3272 3273 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3274 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3275 } 3276 3277 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3278 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3279 } 3280 3281 jint Arguments::parse_options_environment_variable(const char* name, 3282 ScopedVMInitArgs* vm_args) { 3283 char *buffer = ::getenv(name); 3284 3285 // Don't check this environment variable if user has special privileges 3286 // (e.g. unix su command). 3287 if (buffer == NULL || os::have_special_privileges()) { 3288 return JNI_OK; 3289 } 3290 3291 if ((buffer = os::strdup(buffer)) == NULL) { 3292 return JNI_ENOMEM; 3293 } 3294 3295 jio_fprintf(defaultStream::error_stream(), 3296 "Picked up %s: %s\n", name, buffer); 3297 3298 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3299 3300 os::free(buffer); 3301 return retcode; 3302 } 3303 3304 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3305 // read file into buffer 3306 int fd = ::open(file_name, O_RDONLY); 3307 if (fd < 0) { 3308 jio_fprintf(defaultStream::error_stream(), 3309 "Could not open options file '%s'\n", 3310 file_name); 3311 return JNI_ERR; 3312 } 3313 3314 struct stat stbuf; 3315 int retcode = os::stat(file_name, &stbuf); 3316 if (retcode != 0) { 3317 jio_fprintf(defaultStream::error_stream(), 3318 "Could not stat options file '%s'\n", 3319 file_name); 3320 os::close(fd); 3321 return JNI_ERR; 3322 } 3323 3324 if (stbuf.st_size == 0) { 3325 // tell caller there is no option data and that is ok 3326 os::close(fd); 3327 return JNI_OK; 3328 } 3329 3330 // '+ 1' for NULL termination even with max bytes 3331 size_t bytes_alloc = stbuf.st_size + 1; 3332 3333 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3334 if (NULL == buf) { 3335 jio_fprintf(defaultStream::error_stream(), 3336 "Could not allocate read buffer for options file parse\n"); 3337 os::close(fd); 3338 return JNI_ENOMEM; 3339 } 3340 3341 memset(buf, 0, bytes_alloc); 3342 3343 // Fill buffer 3344 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc); 3345 os::close(fd); 3346 if (bytes_read < 0) { 3347 FREE_C_HEAP_ARRAY(char, buf); 3348 jio_fprintf(defaultStream::error_stream(), 3349 "Could not read options file '%s'\n", file_name); 3350 return JNI_ERR; 3351 } 3352 3353 if (bytes_read == 0) { 3354 // tell caller there is no option data and that is ok 3355 FREE_C_HEAP_ARRAY(char, buf); 3356 return JNI_OK; 3357 } 3358 3359 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3360 3361 FREE_C_HEAP_ARRAY(char, buf); 3362 return retcode; 3363 } 3364 3365 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3366 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3367 3368 // some pointers to help with parsing 3369 char *buffer_end = buffer + buf_len; 3370 char *opt_hd = buffer; 3371 char *wrt = buffer; 3372 char *rd = buffer; 3373 3374 // parse all options 3375 while (rd < buffer_end) { 3376 // skip leading white space from the input string 3377 while (rd < buffer_end && isspace(*rd)) { 3378 rd++; 3379 } 3380 3381 if (rd >= buffer_end) { 3382 break; 3383 } 3384 3385 // Remember this is where we found the head of the token. 3386 opt_hd = wrt; 3387 3388 // Tokens are strings of non white space characters separated 3389 // by one or more white spaces. 3390 while (rd < buffer_end && !isspace(*rd)) { 3391 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3392 int quote = *rd; // matching quote to look for 3393 rd++; // don't copy open quote 3394 while (rd < buffer_end && *rd != quote) { 3395 // include everything (even spaces) 3396 // up until the close quote 3397 *wrt++ = *rd++; // copy to option string 3398 } 3399 3400 if (rd < buffer_end) { 3401 rd++; // don't copy close quote 3402 } else { 3403 // did not see closing quote 3404 jio_fprintf(defaultStream::error_stream(), 3405 "Unmatched quote in %s\n", name); 3406 delete options; 3407 return JNI_ERR; 3408 } 3409 } else { 3410 *wrt++ = *rd++; // copy to option string 3411 } 3412 } 3413 3414 // steal a white space character and set it to NULL 3415 *wrt++ = '\0'; 3416 // We now have a complete token 3417 3418 JavaVMOption option; 3419 option.optionString = opt_hd; 3420 option.extraInfo = NULL; 3421 3422 options->append(option); // Fill in option 3423 3424 rd++; // Advance to next character 3425 } 3426 3427 // Fill out JavaVMInitArgs structure. 3428 jint status = vm_args->set_args(options); 3429 3430 delete options; 3431 return status; 3432 } 3433 3434 void Arguments::set_shared_spaces_flags() { 3435 if (DumpSharedSpaces) { 3436 if (FailOverToOldVerifier) { 3437 // Don't fall back to the old verifier on verification failure. If a 3438 // class fails verification with the split verifier, it might fail the 3439 // CDS runtime verifier constraint check. In that case, we don't want 3440 // to share the class. We only archive classes that pass the split verifier. 3441 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3442 } 3443 3444 if (RequireSharedSpaces) { 3445 warning("Cannot dump shared archive while using shared archive"); 3446 } 3447 UseSharedSpaces = false; 3448 #ifdef _LP64 3449 if (!UseCompressedOops || !UseCompressedClassPointers) { 3450 vm_exit_during_initialization( 3451 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3452 } 3453 } else { 3454 if (!UseCompressedOops || !UseCompressedClassPointers) { 3455 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3456 } 3457 #endif 3458 } 3459 } 3460 3461 // Sharing support 3462 // Construct the path to the archive 3463 char* Arguments::get_default_shared_archive_path() { 3464 char *default_archive_path; 3465 char jvm_path[JVM_MAXPATHLEN]; 3466 os::jvm_path(jvm_path, sizeof(jvm_path)); 3467 char *end = strrchr(jvm_path, *os::file_separator()); 3468 if (end != NULL) *end = '\0'; 3469 size_t jvm_path_len = strlen(jvm_path); 3470 size_t file_sep_len = strlen(os::file_separator()); 3471 const size_t len = jvm_path_len + file_sep_len + 20; 3472 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3473 if (default_archive_path != NULL) { 3474 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa", 3475 jvm_path, os::file_separator()); 3476 } 3477 return default_archive_path; 3478 } 3479 3480 static char* get_shared_archive_path() { 3481 char *shared_archive_path; 3482 if (SharedArchiveFile == NULL) { 3483 shared_archive_path = Arguments::get_default_shared_archive_path(); 3484 } else { 3485 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3486 } 3487 return shared_archive_path; 3488 } 3489 3490 #ifndef PRODUCT 3491 // Determine whether LogVMOutput should be implicitly turned on. 3492 static bool use_vm_log() { 3493 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3494 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3495 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3496 PrintAssembly || TraceDeoptimization || TraceDependencies || 3497 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3498 return true; 3499 } 3500 3501 #ifdef COMPILER1 3502 if (PrintC1Statistics) { 3503 return true; 3504 } 3505 #endif // COMPILER1 3506 3507 #ifdef COMPILER2 3508 if (PrintOptoAssembly || PrintOptoStatistics) { 3509 return true; 3510 } 3511 #endif // COMPILER2 3512 3513 return false; 3514 } 3515 3516 #endif // PRODUCT 3517 3518 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3519 for (int index = 0; index < args->nOptions; index++) { 3520 const JavaVMOption* option = args->options + index; 3521 const char* tail; 3522 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3523 return true; 3524 } 3525 } 3526 return false; 3527 } 3528 3529 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3530 const char* vm_options_file, 3531 const int vm_options_file_pos, 3532 ScopedVMInitArgs* vm_options_file_args, 3533 ScopedVMInitArgs* args_out) { 3534 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3535 if (code != JNI_OK) { 3536 return code; 3537 } 3538 3539 if (vm_options_file_args->get()->nOptions < 1) { 3540 return JNI_OK; 3541 } 3542 3543 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3544 jio_fprintf(defaultStream::error_stream(), 3545 "A VM options file may not refer to a VM options file. " 3546 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3547 "options file '%s' in options container '%s' is an error.\n", 3548 vm_options_file_args->vm_options_file_arg(), 3549 vm_options_file_args->container_name()); 3550 return JNI_EINVAL; 3551 } 3552 3553 return args_out->insert(args, vm_options_file_args->get(), 3554 vm_options_file_pos); 3555 } 3556 3557 // Expand -XX:VMOptionsFile found in args_in as needed. 3558 // mod_args and args_out parameters may return values as needed. 3559 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3560 ScopedVMInitArgs* mod_args, 3561 JavaVMInitArgs** args_out) { 3562 jint code = match_special_option_and_act(args_in, mod_args); 3563 if (code != JNI_OK) { 3564 return code; 3565 } 3566 3567 if (mod_args->is_set()) { 3568 // args_in contains -XX:VMOptionsFile and mod_args contains the 3569 // original options from args_in along with the options expanded 3570 // from the VMOptionsFile. Return a short-hand to the caller. 3571 *args_out = mod_args->get(); 3572 } else { 3573 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3574 } 3575 return JNI_OK; 3576 } 3577 3578 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3579 ScopedVMInitArgs* args_out) { 3580 // Remaining part of option string 3581 const char* tail; 3582 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3583 3584 for (int index = 0; index < args->nOptions; index++) { 3585 const JavaVMOption* option = args->options + index; 3586 if (match_option(option, "-XX:Flags=", &tail)) { 3587 Arguments::set_jvm_flags_file(tail); 3588 continue; 3589 } 3590 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3591 if (vm_options_file_args.found_vm_options_file_arg()) { 3592 jio_fprintf(defaultStream::error_stream(), 3593 "The option '%s' is already specified in the options " 3594 "container '%s' so the specification of '%s' in the " 3595 "same options container is an error.\n", 3596 vm_options_file_args.vm_options_file_arg(), 3597 vm_options_file_args.container_name(), 3598 option->optionString); 3599 return JNI_EINVAL; 3600 } 3601 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3602 // If there's a VMOptionsFile, parse that 3603 jint code = insert_vm_options_file(args, tail, index, 3604 &vm_options_file_args, args_out); 3605 if (code != JNI_OK) { 3606 return code; 3607 } 3608 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3609 if (args_out->is_set()) { 3610 // The VMOptions file inserted some options so switch 'args' 3611 // to the new set of options, and continue processing which 3612 // preserves "last option wins" semantics. 3613 args = args_out->get(); 3614 // The first option from the VMOptionsFile replaces the 3615 // current option. So we back track to process the 3616 // replacement option. 3617 index--; 3618 } 3619 continue; 3620 } 3621 if (match_option(option, "-XX:+PrintVMOptions")) { 3622 PrintVMOptions = true; 3623 continue; 3624 } 3625 if (match_option(option, "-XX:-PrintVMOptions")) { 3626 PrintVMOptions = false; 3627 continue; 3628 } 3629 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3630 IgnoreUnrecognizedVMOptions = true; 3631 continue; 3632 } 3633 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3634 IgnoreUnrecognizedVMOptions = false; 3635 continue; 3636 } 3637 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3638 JVMFlag::printFlags(tty, false); 3639 vm_exit(0); 3640 } 3641 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3642 #if INCLUDE_NMT 3643 // The launcher did not setup nmt environment variable properly. 3644 if (!MemTracker::check_launcher_nmt_support(tail)) { 3645 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3646 } 3647 3648 // Verify if nmt option is valid. 3649 if (MemTracker::verify_nmt_option()) { 3650 // Late initialization, still in single-threaded mode. 3651 if (MemTracker::tracking_level() >= NMT_summary) { 3652 MemTracker::init(); 3653 } 3654 } else { 3655 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3656 } 3657 continue; 3658 #else 3659 jio_fprintf(defaultStream::error_stream(), 3660 "Native Memory Tracking is not supported in this VM\n"); 3661 return JNI_ERR; 3662 #endif 3663 } 3664 3665 #ifndef PRODUCT 3666 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3667 JVMFlag::printFlags(tty, true); 3668 vm_exit(0); 3669 } 3670 #endif 3671 } 3672 return JNI_OK; 3673 } 3674 3675 static void print_options(const JavaVMInitArgs *args) { 3676 const char* tail; 3677 for (int index = 0; index < args->nOptions; index++) { 3678 const JavaVMOption *option = args->options + index; 3679 if (match_option(option, "-XX:", &tail)) { 3680 logOption(tail); 3681 } 3682 } 3683 } 3684 3685 bool Arguments::handle_deprecated_print_gc_flags() { 3686 if (PrintGC) { 3687 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3688 } 3689 if (PrintGCDetails) { 3690 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3691 } 3692 3693 if (_gc_log_filename != NULL) { 3694 // -Xloggc was used to specify a filename 3695 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3696 3697 LogTarget(Error, logging) target; 3698 LogStream errstream(target); 3699 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 3700 } else if (PrintGC || PrintGCDetails) { 3701 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3702 } 3703 return true; 3704 } 3705 3706 void Arguments::handle_extra_cms_flags(const char* msg) { 3707 SpecialFlag flag; 3708 const char *flag_name = "UseConcMarkSweepGC"; 3709 if (lookup_special_flag(flag_name, flag)) { 3710 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 3711 warning("%s", msg); 3712 } 3713 } 3714 3715 // Parse entry point called from JNI_CreateJavaVM 3716 3717 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3718 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 3719 3720 // Initialize ranges, constraints and writeables 3721 JVMFlagRangeList::init(); 3722 JVMFlagConstraintList::init(); 3723 JVMFlagWriteableList::init(); 3724 3725 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3726 const char* hotspotrc = ".hotspotrc"; 3727 bool settings_file_specified = false; 3728 bool needs_hotspotrc_warning = false; 3729 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3730 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3731 3732 // Pointers to current working set of containers 3733 JavaVMInitArgs* cur_cmd_args; 3734 JavaVMInitArgs* cur_java_options_args; 3735 JavaVMInitArgs* cur_java_tool_options_args; 3736 3737 // Containers for modified/expanded options 3738 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3739 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3740 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3741 3742 3743 jint code = 3744 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3745 if (code != JNI_OK) { 3746 return code; 3747 } 3748 3749 code = parse_java_options_environment_variable(&initial_java_options_args); 3750 if (code != JNI_OK) { 3751 return code; 3752 } 3753 3754 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3755 &mod_java_tool_options_args, 3756 &cur_java_tool_options_args); 3757 if (code != JNI_OK) { 3758 return code; 3759 } 3760 3761 code = expand_vm_options_as_needed(initial_cmd_args, 3762 &mod_cmd_args, 3763 &cur_cmd_args); 3764 if (code != JNI_OK) { 3765 return code; 3766 } 3767 3768 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3769 &mod_java_options_args, 3770 &cur_java_options_args); 3771 if (code != JNI_OK) { 3772 return code; 3773 } 3774 3775 const char* flags_file = Arguments::get_jvm_flags_file(); 3776 settings_file_specified = (flags_file != NULL); 3777 3778 if (IgnoreUnrecognizedVMOptions) { 3779 cur_cmd_args->ignoreUnrecognized = true; 3780 cur_java_tool_options_args->ignoreUnrecognized = true; 3781 cur_java_options_args->ignoreUnrecognized = true; 3782 } 3783 3784 // Parse specified settings file 3785 if (settings_file_specified) { 3786 if (!process_settings_file(flags_file, true, 3787 cur_cmd_args->ignoreUnrecognized)) { 3788 return JNI_EINVAL; 3789 } 3790 } else { 3791 #ifdef ASSERT 3792 // Parse default .hotspotrc settings file 3793 if (!process_settings_file(".hotspotrc", false, 3794 cur_cmd_args->ignoreUnrecognized)) { 3795 return JNI_EINVAL; 3796 } 3797 #else 3798 struct stat buf; 3799 if (os::stat(hotspotrc, &buf) == 0) { 3800 needs_hotspotrc_warning = true; 3801 } 3802 #endif 3803 } 3804 3805 if (PrintVMOptions) { 3806 print_options(cur_java_tool_options_args); 3807 print_options(cur_cmd_args); 3808 print_options(cur_java_options_args); 3809 } 3810 3811 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3812 jint result = parse_vm_init_args(cur_java_tool_options_args, 3813 cur_java_options_args, 3814 cur_cmd_args); 3815 3816 if (result != JNI_OK) { 3817 return result; 3818 } 3819 3820 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 3821 SharedArchivePath = get_shared_archive_path(); 3822 if (SharedArchivePath == NULL) { 3823 return JNI_ENOMEM; 3824 } 3825 3826 // Set up VerifySharedSpaces 3827 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 3828 VerifySharedSpaces = true; 3829 } 3830 3831 // Delay warning until here so that we've had a chance to process 3832 // the -XX:-PrintWarnings flag 3833 if (needs_hotspotrc_warning) { 3834 warning("%s file is present but has been ignored. " 3835 "Run with -XX:Flags=%s to load the file.", 3836 hotspotrc, hotspotrc); 3837 } 3838 3839 if (needs_module_property_warning) { 3840 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3841 " names that are reserved for internal use."); 3842 } 3843 3844 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3845 UNSUPPORTED_OPTION(UseLargePages); 3846 #endif 3847 3848 #if defined(AIX) 3849 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3850 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt); 3851 #endif 3852 3853 #ifndef PRODUCT 3854 if (TraceBytecodesAt != 0) { 3855 TraceBytecodes = true; 3856 } 3857 if (CountCompiledCalls) { 3858 if (UseCounterDecay) { 3859 warning("UseCounterDecay disabled because CountCalls is set"); 3860 UseCounterDecay = false; 3861 } 3862 } 3863 #endif // PRODUCT 3864 3865 if (ScavengeRootsInCode == 0) { 3866 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3867 warning("Forcing ScavengeRootsInCode non-zero"); 3868 } 3869 ScavengeRootsInCode = 1; 3870 } 3871 3872 if (!handle_deprecated_print_gc_flags()) { 3873 return JNI_EINVAL; 3874 } 3875 3876 // Set object alignment values. 3877 set_object_alignment(); 3878 3879 #if !INCLUDE_CDS 3880 if (DumpSharedSpaces || RequireSharedSpaces) { 3881 jio_fprintf(defaultStream::error_stream(), 3882 "Shared spaces are not supported in this VM\n"); 3883 return JNI_ERR; 3884 } 3885 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 3886 log_is_enabled(Info, cds)) { 3887 warning("Shared spaces are not supported in this VM"); 3888 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3889 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3890 } 3891 no_shared_spaces("CDS Disabled"); 3892 #endif // INCLUDE_CDS 3893 3894 return JNI_OK; 3895 } 3896 3897 jint Arguments::apply_ergo() { 3898 // Set flags based on ergonomics. 3899 jint result = set_ergonomics_flags(); 3900 if (result != JNI_OK) return result; 3901 3902 // Set heap size based on available physical memory 3903 set_heap_size(); 3904 3905 GCConfig::arguments()->initialize(); 3906 3907 set_shared_spaces_flags(); 3908 3909 // Initialize Metaspace flags and alignments 3910 Metaspace::ergo_initialize(); 3911 3912 // Set compiler flags after GC is selected and GC specific 3913 // flags (LoopStripMiningIter) are set. 3914 CompilerConfig::ergo_initialize(); 3915 3916 // Set bytecode rewriting flags 3917 set_bytecode_flags(); 3918 3919 // Set flags if aggressive optimization flags are enabled 3920 jint code = set_aggressive_opts_flags(); 3921 if (code != JNI_OK) { 3922 return code; 3923 } 3924 3925 // Turn off biased locking for locking debug mode flags, 3926 // which are subtly different from each other but neither works with 3927 // biased locking 3928 if (UseHeavyMonitors 3929 #ifdef COMPILER1 3930 || !UseFastLocking 3931 #endif // COMPILER1 3932 #if INCLUDE_JVMCI 3933 || !JVMCIUseFastLocking 3934 #endif 3935 ) { 3936 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 3937 // flag set to true on command line; warn the user that they 3938 // can't enable biased locking here 3939 warning("Biased Locking is not supported with locking debug flags" 3940 "; ignoring UseBiasedLocking flag." ); 3941 } 3942 UseBiasedLocking = false; 3943 } 3944 3945 #ifdef CC_INTERP 3946 // Clear flags not supported on zero. 3947 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3948 FLAG_SET_DEFAULT(UseBiasedLocking, false); 3949 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 3950 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 3951 #endif // CC_INTERP 3952 3953 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3954 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3955 DebugNonSafepoints = true; 3956 } 3957 3958 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3959 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3960 } 3961 3962 if (!EnableValhalla || is_interpreter_only()) { 3963 // Disable calling convention optimizations if value types are not supported 3964 ValueTypePassFieldsAsArgs = false; 3965 ValueTypeReturnedAsFields = false; 3966 } 3967 3968 #ifndef PRODUCT 3969 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3970 if (use_vm_log()) { 3971 LogVMOutput = true; 3972 } 3973 } 3974 #endif // PRODUCT 3975 3976 if (PrintCommandLineFlags) { 3977 JVMFlag::printSetFlags(tty); 3978 } 3979 3980 // Apply CPU specific policy for the BiasedLocking 3981 if (UseBiasedLocking) { 3982 if (!VM_Version::use_biased_locking() && 3983 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 3984 UseBiasedLocking = false; 3985 } 3986 } 3987 #ifdef COMPILER2 3988 if (!UseBiasedLocking) { 3989 UseOptoBiasInlining = false; 3990 } 3991 #endif 3992 3993 #if defined(IA32) 3994 // Only server compiler can optimize safepoints well enough. 3995 if (!is_server_compilation_mode_vm()) { 3996 FLAG_SET_ERGO_IF_DEFAULT(bool, ThreadLocalHandshakes, false); 3997 } 3998 #endif 3999 4000 // ThreadLocalHandshakesConstraintFunc handles the constraints. 4001 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 4002 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4003 } else { 4004 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4005 } 4006 4007 return JNI_OK; 4008 } 4009 4010 jint Arguments::adjust_after_os() { 4011 if (UseNUMA) { 4012 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 4013 FLAG_SET_ERGO(bool, UseNUMA, false); 4014 } else if (UseParallelGC || UseParallelOldGC) { 4015 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4016 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4017 } 4018 } 4019 // UseNUMAInterleaving is set to ON for all collectors and 4020 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4021 // such as the parallel collector for Linux and Solaris will 4022 // interleave old gen and survivor spaces on top of NUMA 4023 // allocation policy for the eden space. 4024 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4025 // all platforms and ParallelGC on Windows will interleave all 4026 // of the heap spaces across NUMA nodes. 4027 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4028 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4029 } 4030 } 4031 return JNI_OK; 4032 } 4033 4034 int Arguments::PropertyList_count(SystemProperty* pl) { 4035 int count = 0; 4036 while(pl != NULL) { 4037 count++; 4038 pl = pl->next(); 4039 } 4040 return count; 4041 } 4042 4043 // Return the number of readable properties. 4044 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4045 int count = 0; 4046 while(pl != NULL) { 4047 if (pl->is_readable()) { 4048 count++; 4049 } 4050 pl = pl->next(); 4051 } 4052 return count; 4053 } 4054 4055 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4056 assert(key != NULL, "just checking"); 4057 SystemProperty* prop; 4058 for (prop = pl; prop != NULL; prop = prop->next()) { 4059 if (strcmp(key, prop->key()) == 0) return prop->value(); 4060 } 4061 return NULL; 4062 } 4063 4064 // Return the value of the requested property provided that it is a readable property. 4065 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4066 assert(key != NULL, "just checking"); 4067 SystemProperty* prop; 4068 // Return the property value if the keys match and the property is not internal or 4069 // it's the special internal property "jdk.boot.class.path.append". 4070 for (prop = pl; prop != NULL; prop = prop->next()) { 4071 if (strcmp(key, prop->key()) == 0) { 4072 if (!prop->internal()) { 4073 return prop->value(); 4074 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4075 return prop->value(); 4076 } else { 4077 // Property is internal and not jdk.boot.class.path.append so return NULL. 4078 return NULL; 4079 } 4080 } 4081 } 4082 return NULL; 4083 } 4084 4085 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4086 int count = 0; 4087 const char* ret_val = NULL; 4088 4089 while(pl != NULL) { 4090 if(count >= index) { 4091 ret_val = pl->key(); 4092 break; 4093 } 4094 count++; 4095 pl = pl->next(); 4096 } 4097 4098 return ret_val; 4099 } 4100 4101 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4102 int count = 0; 4103 char* ret_val = NULL; 4104 4105 while(pl != NULL) { 4106 if(count >= index) { 4107 ret_val = pl->value(); 4108 break; 4109 } 4110 count++; 4111 pl = pl->next(); 4112 } 4113 4114 return ret_val; 4115 } 4116 4117 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4118 SystemProperty* p = *plist; 4119 if (p == NULL) { 4120 *plist = new_p; 4121 } else { 4122 while (p->next() != NULL) { 4123 p = p->next(); 4124 } 4125 p->set_next(new_p); 4126 } 4127 } 4128 4129 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4130 bool writeable, bool internal) { 4131 if (plist == NULL) 4132 return; 4133 4134 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4135 PropertyList_add(plist, new_p); 4136 } 4137 4138 void Arguments::PropertyList_add(SystemProperty *element) { 4139 PropertyList_add(&_system_properties, element); 4140 } 4141 4142 // This add maintains unique property key in the list. 4143 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4144 PropertyAppendable append, PropertyWriteable writeable, 4145 PropertyInternal internal) { 4146 if (plist == NULL) 4147 return; 4148 4149 // If property key exist then update with new value. 4150 SystemProperty* prop; 4151 for (prop = *plist; prop != NULL; prop = prop->next()) { 4152 if (strcmp(k, prop->key()) == 0) { 4153 if (append == AppendProperty) { 4154 prop->append_value(v); 4155 } else { 4156 prop->set_value(v); 4157 } 4158 return; 4159 } 4160 } 4161 4162 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4163 } 4164 4165 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4166 // Returns true if all of the source pointed by src has been copied over to 4167 // the destination buffer pointed by buf. Otherwise, returns false. 4168 // Notes: 4169 // 1. If the length (buflen) of the destination buffer excluding the 4170 // NULL terminator character is not long enough for holding the expanded 4171 // pid characters, it also returns false instead of returning the partially 4172 // expanded one. 4173 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4174 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4175 char* buf, size_t buflen) { 4176 const char* p = src; 4177 char* b = buf; 4178 const char* src_end = &src[srclen]; 4179 char* buf_end = &buf[buflen - 1]; 4180 4181 while (p < src_end && b < buf_end) { 4182 if (*p == '%') { 4183 switch (*(++p)) { 4184 case '%': // "%%" ==> "%" 4185 *b++ = *p++; 4186 break; 4187 case 'p': { // "%p" ==> current process id 4188 // buf_end points to the character before the last character so 4189 // that we could write '\0' to the end of the buffer. 4190 size_t buf_sz = buf_end - b + 1; 4191 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4192 4193 // if jio_snprintf fails or the buffer is not long enough to hold 4194 // the expanded pid, returns false. 4195 if (ret < 0 || ret >= (int)buf_sz) { 4196 return false; 4197 } else { 4198 b += ret; 4199 assert(*b == '\0', "fail in copy_expand_pid"); 4200 if (p == src_end && b == buf_end + 1) { 4201 // reach the end of the buffer. 4202 return true; 4203 } 4204 } 4205 p++; 4206 break; 4207 } 4208 default : 4209 *b++ = '%'; 4210 } 4211 } else { 4212 *b++ = *p++; 4213 } 4214 } 4215 *b = '\0'; 4216 return (p == src_end); // return false if not all of the source was copied 4217 }