1 /* 2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/javaAssertions.hpp" 29 #include "classfile/moduleEntry.hpp" 30 #include "classfile/stringTable.hpp" 31 #include "classfile/symbolTable.hpp" 32 #include "gc/shared/gcArguments.hpp" 33 #include "gc/shared/gcConfig.hpp" 34 #include "logging/log.hpp" 35 #include "logging/logConfiguration.hpp" 36 #include "logging/logStream.hpp" 37 #include "logging/logTag.hpp" 38 #include "memory/allocation.inline.hpp" 39 #include "memory/filemap.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "prims/jvmtiExport.hpp" 42 #include "runtime/arguments.hpp" 43 #include "runtime/flags/jvmFlag.hpp" 44 #include "runtime/flags/jvmFlagConstraintList.hpp" 45 #include "runtime/flags/jvmFlagWriteableList.hpp" 46 #include "runtime/flags/jvmFlagRangeList.hpp" 47 #include "runtime/globals_extension.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/os.inline.hpp" 50 #include "runtime/safepoint.hpp" 51 #include "runtime/safepointMechanism.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/align.hpp" 56 #include "utilities/defaultStream.hpp" 57 #include "utilities/macros.hpp" 58 #include "utilities/stringUtils.hpp" 59 #if INCLUDE_JFR 60 #include "jfr/jfr.hpp" 61 #endif 62 63 #define DEFAULT_JAVA_LAUNCHER "generic" 64 65 char* Arguments::_jvm_flags_file = NULL; 66 char** Arguments::_jvm_flags_array = NULL; 67 int Arguments::_num_jvm_flags = 0; 68 char** Arguments::_jvm_args_array = NULL; 69 int Arguments::_num_jvm_args = 0; 70 char* Arguments::_java_command = NULL; 71 SystemProperty* Arguments::_system_properties = NULL; 72 const char* Arguments::_gc_log_filename = NULL; 73 size_t Arguments::_conservative_max_heap_alignment = 0; 74 Arguments::Mode Arguments::_mode = _mixed; 75 bool Arguments::_java_compiler = false; 76 bool Arguments::_xdebug_mode = false; 77 const char* Arguments::_java_vendor_url_bug = NULL; 78 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 79 bool Arguments::_sun_java_launcher_is_altjvm = false; 80 81 // These parameters are reset in method parse_vm_init_args() 82 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 83 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 84 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 85 bool Arguments::_ClipInlining = ClipInlining; 86 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 87 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 88 89 bool Arguments::_enable_preview = false; 90 91 char* Arguments::SharedArchivePath = NULL; 92 char* Arguments::SharedDynamicArchivePath = NULL; 93 94 AgentLibraryList Arguments::_libraryList; 95 AgentLibraryList Arguments::_agentList; 96 97 // These are not set by the JDK's built-in launchers, but they can be set by 98 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 99 // JavaVMOption in jni.h. 100 abort_hook_t Arguments::_abort_hook = NULL; 101 exit_hook_t Arguments::_exit_hook = NULL; 102 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 103 104 105 SystemProperty *Arguments::_sun_boot_library_path = NULL; 106 SystemProperty *Arguments::_java_library_path = NULL; 107 SystemProperty *Arguments::_java_home = NULL; 108 SystemProperty *Arguments::_java_class_path = NULL; 109 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 110 SystemProperty *Arguments::_vm_info = NULL; 111 112 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 113 PathString *Arguments::_system_boot_class_path = NULL; 114 bool Arguments::_has_jimage = false; 115 116 char* Arguments::_ext_dirs = NULL; 117 118 bool PathString::set_value(const char *value) { 119 if (_value != NULL) { 120 FreeHeap(_value); 121 } 122 _value = AllocateHeap(strlen(value)+1, mtArguments); 123 assert(_value != NULL, "Unable to allocate space for new path value"); 124 if (_value != NULL) { 125 strcpy(_value, value); 126 } else { 127 // not able to allocate 128 return false; 129 } 130 return true; 131 } 132 133 void PathString::append_value(const char *value) { 134 char *sp; 135 size_t len = 0; 136 if (value != NULL) { 137 len = strlen(value); 138 if (_value != NULL) { 139 len += strlen(_value); 140 } 141 sp = AllocateHeap(len+2, mtArguments); 142 assert(sp != NULL, "Unable to allocate space for new append path value"); 143 if (sp != NULL) { 144 if (_value != NULL) { 145 strcpy(sp, _value); 146 strcat(sp, os::path_separator()); 147 strcat(sp, value); 148 FreeHeap(_value); 149 } else { 150 strcpy(sp, value); 151 } 152 _value = sp; 153 } 154 } 155 } 156 157 PathString::PathString(const char* value) { 158 if (value == NULL) { 159 _value = NULL; 160 } else { 161 _value = AllocateHeap(strlen(value)+1, mtArguments); 162 strcpy(_value, value); 163 } 164 } 165 166 PathString::~PathString() { 167 if (_value != NULL) { 168 FreeHeap(_value); 169 _value = NULL; 170 } 171 } 172 173 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 174 assert(module_name != NULL && path != NULL, "Invalid module name or path value"); 175 size_t len = strlen(module_name) + 1; 176 _module_name = AllocateHeap(len, mtInternal); 177 strncpy(_module_name, module_name, len); // copy the trailing null 178 _path = new PathString(path); 179 } 180 181 ModulePatchPath::~ModulePatchPath() { 182 if (_module_name != NULL) { 183 FreeHeap(_module_name); 184 _module_name = NULL; 185 } 186 if (_path != NULL) { 187 delete _path; 188 _path = NULL; 189 } 190 } 191 192 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 193 if (key == NULL) { 194 _key = NULL; 195 } else { 196 _key = AllocateHeap(strlen(key)+1, mtArguments); 197 strcpy(_key, key); 198 } 199 _next = NULL; 200 _internal = internal; 201 _writeable = writeable; 202 } 203 204 AgentLibrary::AgentLibrary(const char* name, const char* options, 205 bool is_absolute_path, void* os_lib, 206 bool instrument_lib) { 207 _name = AllocateHeap(strlen(name)+1, mtArguments); 208 strcpy(_name, name); 209 if (options == NULL) { 210 _options = NULL; 211 } else { 212 _options = AllocateHeap(strlen(options)+1, mtArguments); 213 strcpy(_options, options); 214 } 215 _is_absolute_path = is_absolute_path; 216 _os_lib = os_lib; 217 _next = NULL; 218 _state = agent_invalid; 219 _is_static_lib = false; 220 _is_instrument_lib = instrument_lib; 221 } 222 223 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 224 // part of the option string. 225 static bool match_option(const JavaVMOption *option, const char* name, 226 const char** tail) { 227 size_t len = strlen(name); 228 if (strncmp(option->optionString, name, len) == 0) { 229 *tail = option->optionString + len; 230 return true; 231 } else { 232 return false; 233 } 234 } 235 236 // Check if 'option' matches 'name'. No "tail" is allowed. 237 static bool match_option(const JavaVMOption *option, const char* name) { 238 const char* tail = NULL; 239 bool result = match_option(option, name, &tail); 240 if (tail != NULL && *tail == '\0') { 241 return result; 242 } else { 243 return false; 244 } 245 } 246 247 // Return true if any of the strings in null-terminated array 'names' matches. 248 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 249 // the option must match exactly. 250 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 251 bool tail_allowed) { 252 for (/* empty */; *names != NULL; ++names) { 253 if (match_option(option, *names, tail)) { 254 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 255 return true; 256 } 257 } 258 } 259 return false; 260 } 261 262 #if INCLUDE_JFR 263 static bool _has_jfr_option = false; // is using JFR 264 265 // return true on failure 266 static bool match_jfr_option(const JavaVMOption** option) { 267 assert((*option)->optionString != NULL, "invariant"); 268 char* tail = NULL; 269 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 270 _has_jfr_option = true; 271 return Jfr::on_start_flight_recording_option(option, tail); 272 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 273 _has_jfr_option = true; 274 return Jfr::on_flight_recorder_option(option, tail); 275 } 276 return false; 277 } 278 279 bool Arguments::has_jfr_option() { 280 return _has_jfr_option; 281 } 282 #endif 283 284 static void logOption(const char* opt) { 285 if (PrintVMOptions) { 286 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 287 } 288 } 289 290 bool needs_module_property_warning = false; 291 292 #define MODULE_PROPERTY_PREFIX "jdk.module." 293 #define MODULE_PROPERTY_PREFIX_LEN 11 294 #define ADDEXPORTS "addexports" 295 #define ADDEXPORTS_LEN 10 296 #define ADDREADS "addreads" 297 #define ADDREADS_LEN 8 298 #define ADDOPENS "addopens" 299 #define ADDOPENS_LEN 8 300 #define PATCH "patch" 301 #define PATCH_LEN 5 302 #define ADDMODS "addmods" 303 #define ADDMODS_LEN 7 304 #define LIMITMODS "limitmods" 305 #define LIMITMODS_LEN 9 306 #define PATH "path" 307 #define PATH_LEN 4 308 #define UPGRADE_PATH "upgrade.path" 309 #define UPGRADE_PATH_LEN 12 310 311 void Arguments::add_init_library(const char* name, char* options) { 312 _libraryList.add(new AgentLibrary(name, options, false, NULL)); 313 } 314 315 void Arguments::add_init_agent(const char* name, char* options, bool absolute_path) { 316 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL)); 317 } 318 319 void Arguments::add_instrument_agent(const char* name, char* options, bool absolute_path) { 320 _agentList.add(new AgentLibrary(name, options, absolute_path, NULL, true)); 321 } 322 323 // Late-binding agents not started via arguments 324 void Arguments::add_loaded_agent(AgentLibrary *agentLib) { 325 _agentList.add(agentLib); 326 } 327 328 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 329 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 330 return ((strncmp(option, property, len) == 0) && 331 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 332 } 333 334 // Return true if property starts with "jdk.module." and its ensuing chars match 335 // any of the reserved module properties. 336 // property should be passed without the leading "-D". 337 bool Arguments::is_internal_module_property(const char* property) { 338 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 339 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 340 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 341 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 342 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 343 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 344 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 345 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 346 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 347 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 348 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 349 return true; 350 } 351 } 352 return false; 353 } 354 355 // Process java launcher properties. 356 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 357 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 358 // Must do this before setting up other system properties, 359 // as some of them may depend on launcher type. 360 for (int index = 0; index < args->nOptions; index++) { 361 const JavaVMOption* option = args->options + index; 362 const char* tail; 363 364 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 365 process_java_launcher_argument(tail, option->extraInfo); 366 continue; 367 } 368 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 369 if (strcmp(tail, "true") == 0) { 370 _sun_java_launcher_is_altjvm = true; 371 } 372 continue; 373 } 374 } 375 } 376 377 // Initialize system properties key and value. 378 void Arguments::init_system_properties() { 379 380 // Set up _system_boot_class_path which is not a property but 381 // relies heavily on argument processing and the jdk.boot.class.path.append 382 // property. It is used to store the underlying system boot class path. 383 _system_boot_class_path = new PathString(NULL); 384 385 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 386 "Java Virtual Machine Specification", false)); 387 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 388 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 389 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 390 391 // Initialize the vm.info now, but it will need updating after argument parsing. 392 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 393 394 // Following are JVMTI agent writable properties. 395 // Properties values are set to NULL and they are 396 // os specific they are initialized in os::init_system_properties_values(). 397 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 398 _java_library_path = new SystemProperty("java.library.path", NULL, true); 399 _java_home = new SystemProperty("java.home", NULL, true); 400 _java_class_path = new SystemProperty("java.class.path", "", true); 401 // jdk.boot.class.path.append is a non-writeable, internal property. 402 // It can only be set by either: 403 // - -Xbootclasspath/a: 404 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 405 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 406 407 // Add to System Property list. 408 PropertyList_add(&_system_properties, _sun_boot_library_path); 409 PropertyList_add(&_system_properties, _java_library_path); 410 PropertyList_add(&_system_properties, _java_home); 411 PropertyList_add(&_system_properties, _java_class_path); 412 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 413 PropertyList_add(&_system_properties, _vm_info); 414 415 // Set OS specific system properties values 416 os::init_system_properties_values(); 417 } 418 419 // Update/Initialize System properties after JDK version number is known 420 void Arguments::init_version_specific_system_properties() { 421 enum { bufsz = 16 }; 422 char buffer[bufsz]; 423 const char* spec_vendor = "Oracle Corporation"; 424 uint32_t spec_version = JDK_Version::current().major_version(); 425 426 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 427 428 PropertyList_add(&_system_properties, 429 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 430 PropertyList_add(&_system_properties, 431 new SystemProperty("java.vm.specification.version", buffer, false)); 432 PropertyList_add(&_system_properties, 433 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 434 } 435 436 /* 437 * -XX argument processing: 438 * 439 * -XX arguments are defined in several places, such as: 440 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 441 * -XX arguments are parsed in parse_argument(). 442 * -XX argument bounds checking is done in check_vm_args_consistency(). 443 * 444 * Over time -XX arguments may change. There are mechanisms to handle common cases: 445 * 446 * ALIASED: An option that is simply another name for another option. This is often 447 * part of the process of deprecating a flag, but not all aliases need 448 * to be deprecated. 449 * 450 * Create an alias for an option by adding the old and new option names to the 451 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 452 * 453 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 454 * support may be removed in the future. Both regular and aliased options may be 455 * deprecated. 456 * 457 * Add a deprecation warning for an option (or alias) by adding an entry in the 458 * "special_jvm_flags" table and setting the "deprecated_in" field. 459 * Often an option "deprecated" in one major release will 460 * be made "obsolete" in the next. In this case the entry should also have its 461 * "obsolete_in" field set. 462 * 463 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 464 * on the command line. A warning is printed to let the user know that option might not 465 * be accepted in the future. 466 * 467 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 468 * table and setting the "obsolete_in" field. 469 * 470 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 471 * to the current JDK version. The system will flatly refuse to admit the existence of 472 * the flag. This allows a flag to die automatically over JDK releases. 473 * 474 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 475 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 476 * - Newly obsolete or expired deprecated options should have their global variable 477 * definitions removed (from globals.hpp, etc) and related implementations removed. 478 * 479 * Recommended approach for removing options: 480 * 481 * To remove options commonly used by customers (e.g. product -XX options), use 482 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 483 * 484 * To remove internal options (e.g. diagnostic, experimental, develop options), use 485 * a 2-step model adding major release numbers to the obsolete and expire columns. 486 * 487 * To change the name of an option, use the alias table as well as a 2-step 488 * model adding major release numbers to the deprecate and expire columns. 489 * Think twice about aliasing commonly used customer options. 490 * 491 * There are times when it is appropriate to leave a future release number as undefined. 492 * 493 * Tests: Aliases should be tested in VMAliasOptions.java. 494 * Deprecated options should be tested in VMDeprecatedOptions.java. 495 */ 496 497 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 498 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 499 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 500 // the command-line as usual, but will issue a warning. 501 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 502 // the command-line, while issuing a warning and ignoring the flag value. 503 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 504 // existence of the flag. 505 // 506 // MANUAL CLEANUP ON JDK VERSION UPDATES: 507 // This table ensures that the handling of options will update automatically when the JDK 508 // version is incremented, but the source code needs to be cleanup up manually: 509 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 510 // variable should be removed, as well as users of the variable. 511 // - As "deprecated" options age into "obsolete" options, move the entry into the 512 // "Obsolete Flags" section of the table. 513 // - All expired options should be removed from the table. 514 static SpecialFlag const special_jvm_flags[] = { 515 // -------------- Deprecated Flags -------------- 516 // --- Non-alias flags - sorted by obsolete_in then expired_in: 517 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 518 { "MaxRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 519 { "MinRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 520 { "InitialRAMFraction", JDK_Version::jdk(10), JDK_Version::undefined(), JDK_Version::undefined() }, 521 { "UseMembar", JDK_Version::jdk(10), JDK_Version::jdk(12), JDK_Version::undefined() }, 522 { "AllowJNIEnvProxy", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 523 { "ThreadLocalHandshakes", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 524 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 525 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 526 { "FieldsAllocationStyle", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 527 { "CompactFields", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 528 { "MonitorBound", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 529 { "G1RSetScanBlockSize", JDK_Version::jdk(14), JDK_Version::jdk(15), JDK_Version::jdk(16) }, 530 531 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 532 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 533 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 534 { "TLABStats", JDK_Version::jdk(12), JDK_Version::undefined(), JDK_Version::undefined() }, 535 536 // -------------- Obsolete Flags - sorted by expired_in -------------- 537 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 538 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 539 { "SharedReadWriteSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 540 { "SharedReadOnlySize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 541 { "SharedMiscDataSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 542 { "SharedMiscCodeSize", JDK_Version::undefined(), JDK_Version::jdk(10), JDK_Version::undefined() }, 543 { "CompilationPolicyChoice", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 544 { "TraceNMethodInstalls", JDK_Version::jdk(13), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 545 { "FailOverToOldVerifier", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 546 { "UseConcMarkSweepGC", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 547 { "CMSAbortSemantics", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 548 { "CMSAbortablePrecleanMinWorkPerIteration", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 549 { "CMSBitMapYieldQuantum", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 550 { "CMSBootstrapOccupancy", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 551 { "CMSClassUnloadingEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 552 { "CMSClassUnloadingMaxInterval", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 553 { "CMSCleanOnEnter", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 554 { "CMSConcMarkMultiple", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 555 { "CMSConcurrentMTEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 556 { "CMSCoordinatorYieldSleepCount", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 557 { "CMSEdenChunksRecordAlways", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 558 { "CMSExpAvgFactor", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 559 { "CMSExtrapolateSweep", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 560 { "CMSIncrementalSafetyFactor", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 561 { "CMSIndexedFreeListReplenish", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 562 { "CMSInitiatingOccupancyFraction", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 563 { "CMSIsTooFullPercentage", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 564 { "CMSLargeCoalSurplusPercent", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 565 { "CMSLargeSplitSurplusPercent", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 566 { "CMSLoopWarn", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 567 { "CMSMaxAbortablePrecleanLoops", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 568 { "CMSMaxAbortablePrecleanTime", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 569 { "CMSOldPLABMax", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 570 { "CMSOldPLABMin", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 571 { "CMSOldPLABNumRefills", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 572 { "CMSOldPLABReactivityFactor", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 573 { "CMSOldPLABResizeQuicker", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 574 { "CMSOldPLABToleranceFactor", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 575 { "CMSPLABRecordAlways", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 576 { "CMSParallelInitialMarkEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 577 { "CMSParallelRemarkEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 578 { "CMSParallelSurvivorRemarkEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 579 { "CMSPrecleanDenominator", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 580 { "CMSPrecleanIter", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 581 { "CMSPrecleanNumerator", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 582 { "CMSPrecleanRefLists1", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 583 { "CMSPrecleanRefLists2", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 584 { "CMSPrecleanSurvivors1", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 585 { "CMSPrecleanSurvivors2", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 586 { "CMSPrecleanThreshold", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 587 { "CMSPrecleaningEnabled", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 588 { "CMSPrintChunksInDump", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 589 { "CMSPrintObjectsInDump", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 590 { "CMSRemarkVerifyVariant", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 591 { "CMSReplenishIntermediate", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 592 { "CMSRescanMultiple", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 593 { "CMSSamplingGrain", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 594 { "CMSScavengeBeforeRemark", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 595 { "CMSScheduleRemarkEdenPenetration", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 596 { "CMSScheduleRemarkEdenSizeThreshold", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 597 { "CMSScheduleRemarkSamplingRatio", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 598 { "CMSSmallCoalSurplusPercent", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 599 { "CMSSmallSplitSurplusPercent", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 600 { "CMSSplitIndexedFreeListBlocks", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 601 { "CMSTriggerRatio", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 602 { "CMSWorkQueueDrainThreshold", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 603 { "CMSYield", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 604 { "CMSYieldSleepCount", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 605 { "CMSYoungGenPerWorker", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 606 { "CMS_FLSPadding", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 607 { "CMS_FLSWeight", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 608 { "CMS_SweepPadding", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 609 { "CMS_SweepTimerThresholdMillis", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 610 { "CMS_SweepWeight", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 611 { "FLSAlwaysCoalesceLarge", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 612 { "FLSCoalescePolicy", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 613 { "FLSLargestBlockCoalesceProximity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 614 { "OldPLABWeight", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 615 { "ParGCDesiredObjsFromOverflowList", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 616 { "ParGCTrimOverflow", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 617 { "ParGCUseLocalOverflow", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 618 { "ResizeOldPLAB", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 619 { "UseCMSBestFit", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 620 { "UseCMSInitiatingOccupancyOnly", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(15) }, 621 { "BindGCTaskThreadsToCPUs", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 622 { "UseGCTaskAffinity", JDK_Version::undefined(), JDK_Version::jdk(14), JDK_Version::jdk(16) }, 623 624 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 625 // These entries will generate build errors. Their purpose is to test the macros. 626 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 627 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 628 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 629 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 630 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 631 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 632 #endif 633 634 { NULL, JDK_Version(0), JDK_Version(0) } 635 }; 636 637 // Flags that are aliases for other flags. 638 typedef struct { 639 const char* alias_name; 640 const char* real_name; 641 } AliasedFlag; 642 643 static AliasedFlag const aliased_jvm_flags[] = { 644 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 645 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 646 { NULL, NULL} 647 }; 648 649 // NOTE: A compatibility request will be necessary for each alias to be removed. 650 static AliasedLoggingFlag const aliased_logging_flags[] = { 651 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 652 { "PrintSharedSpaces", LogLevel::Info, true, LOG_TAGS(cds) }, 653 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 654 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 655 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 656 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 657 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 658 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 659 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 660 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 661 { "TraceMonitorInflation", LogLevel::Trace, true, LOG_TAGS(monitorinflation) }, 662 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 663 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 664 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 665 { "PrintJNIResolving", LogLevel::Debug, true, LOG_TAGS(jni, resolve) }, 666 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 667 }; 668 669 #ifndef PRODUCT 670 // These options are removed in jdk9. Remove this code for jdk10. 671 static AliasedFlag const removed_develop_logging_flags[] = { 672 { "TraceClassInitialization", "-Xlog:class+init" }, 673 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 674 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 675 { "TraceItables", "-Xlog:itables=debug" }, 676 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 677 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 678 { "TraceStartupTime", "-Xlog:startuptime" }, 679 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 680 { "PrintVtables", "-Xlog:vtables=debug" }, 681 { "VerboseVerification", "-Xlog:verification" }, 682 { NULL, NULL } 683 }; 684 #endif //PRODUCT 685 686 // Return true if "v" is less than "other", where "other" may be "undefined". 687 static bool version_less_than(JDK_Version v, JDK_Version other) { 688 assert(!v.is_undefined(), "must be defined"); 689 if (!other.is_undefined() && v.compare(other) >= 0) { 690 return false; 691 } else { 692 return true; 693 } 694 } 695 696 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 697 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 698 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 699 flag = special_jvm_flags[i]; 700 return true; 701 } 702 } 703 return false; 704 } 705 706 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 707 assert(version != NULL, "Must provide a version buffer"); 708 SpecialFlag flag; 709 if (lookup_special_flag(flag_name, flag)) { 710 if (!flag.obsolete_in.is_undefined()) { 711 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 712 *version = flag.obsolete_in; 713 return true; 714 } 715 } 716 } 717 return false; 718 } 719 720 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 721 assert(version != NULL, "Must provide a version buffer"); 722 SpecialFlag flag; 723 if (lookup_special_flag(flag_name, flag)) { 724 if (!flag.deprecated_in.is_undefined()) { 725 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 726 version_less_than(JDK_Version::current(), flag.expired_in)) { 727 *version = flag.deprecated_in; 728 return 1; 729 } else { 730 return -1; 731 } 732 } 733 } 734 return 0; 735 } 736 737 #ifndef PRODUCT 738 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 739 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 740 const AliasedFlag& flag = removed_develop_logging_flags[i]; 741 if (strcmp(flag.alias_name, name) == 0) { 742 return flag.real_name; 743 } 744 } 745 return NULL; 746 } 747 #endif // PRODUCT 748 749 const char* Arguments::real_flag_name(const char *flag_name) { 750 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 751 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 752 if (strcmp(flag_status.alias_name, flag_name) == 0) { 753 return flag_status.real_name; 754 } 755 } 756 return flag_name; 757 } 758 759 #ifdef ASSERT 760 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 761 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 762 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 763 return true; 764 } 765 } 766 return false; 767 } 768 769 // Verifies the correctness of the entries in the special_jvm_flags table. 770 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 771 // version being earlier than the deprecation version, then a warning is issued 772 // and verification fails - by returning false. If it is detected that the table 773 // is out of date, with respect to the current version, then a warning is issued 774 // but verification does not fail. This allows the VM to operate when the version 775 // is first updated, without needing to update all the impacted flags at the 776 // same time. 777 static bool verify_special_jvm_flags() { 778 bool success = true; 779 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 780 const SpecialFlag& flag = special_jvm_flags[i]; 781 if (lookup_special_flag(flag.name, i)) { 782 warning("Duplicate special flag declaration \"%s\"", flag.name); 783 success = false; 784 } 785 if (flag.deprecated_in.is_undefined() && 786 flag.obsolete_in.is_undefined()) { 787 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 788 success = false; 789 } 790 791 if (!flag.deprecated_in.is_undefined()) { 792 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 793 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 794 success = false; 795 } 796 797 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 798 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 799 success = false; 800 } 801 } 802 803 if (!flag.obsolete_in.is_undefined()) { 804 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 805 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 806 success = false; 807 } 808 809 // if flag has become obsolete it should not have a "globals" flag defined anymore. 810 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 811 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 812 // Temporarily disable the warning: 8196739 813 // warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 814 } 815 } 816 } 817 818 if (!flag.expired_in.is_undefined()) { 819 // if flag has become expired it should not have a "globals" flag defined anymore. 820 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 821 if (JVMFlag::find_declared_flag(flag.name) != NULL) { 822 // Temporarily disable the warning: 8196739 823 // warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 824 } 825 } 826 } 827 828 } 829 return success; 830 } 831 #endif 832 833 // Parses a size specification string. 834 bool Arguments::atojulong(const char *s, julong* result) { 835 julong n = 0; 836 837 // First char must be a digit. Don't allow negative numbers or leading spaces. 838 if (!isdigit(*s)) { 839 return false; 840 } 841 842 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 843 char* remainder; 844 errno = 0; 845 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 846 if (errno != 0) { 847 return false; 848 } 849 850 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 851 if (remainder == s || strlen(remainder) > 1) { 852 return false; 853 } 854 855 switch (*remainder) { 856 case 'T': case 't': 857 *result = n * G * K; 858 // Check for overflow. 859 if (*result/((julong)G * K) != n) return false; 860 return true; 861 case 'G': case 'g': 862 *result = n * G; 863 if (*result/G != n) return false; 864 return true; 865 case 'M': case 'm': 866 *result = n * M; 867 if (*result/M != n) return false; 868 return true; 869 case 'K': case 'k': 870 *result = n * K; 871 if (*result/K != n) return false; 872 return true; 873 case '\0': 874 *result = n; 875 return true; 876 default: 877 return false; 878 } 879 } 880 881 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 882 if (size < min_size) return arg_too_small; 883 if (size > max_size) return arg_too_big; 884 return arg_in_range; 885 } 886 887 // Describe an argument out of range error 888 void Arguments::describe_range_error(ArgsRange errcode) { 889 switch(errcode) { 890 case arg_too_big: 891 jio_fprintf(defaultStream::error_stream(), 892 "The specified size exceeds the maximum " 893 "representable size.\n"); 894 break; 895 case arg_too_small: 896 case arg_unreadable: 897 case arg_in_range: 898 // do nothing for now 899 break; 900 default: 901 ShouldNotReachHere(); 902 } 903 } 904 905 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlag::Flags origin) { 906 if (JVMFlag::boolAtPut(flag, &value, origin) == JVMFlag::SUCCESS) { 907 return true; 908 } else { 909 return false; 910 } 911 } 912 913 static bool set_fp_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 914 char* end; 915 errno = 0; 916 double v = strtod(value, &end); 917 if ((errno != 0) || (*end != 0)) { 918 return false; 919 } 920 921 if (JVMFlag::doubleAtPut(flag, &v, origin) == JVMFlag::SUCCESS) { 922 return true; 923 } 924 return false; 925 } 926 927 static bool set_numeric_flag(JVMFlag* flag, char* value, JVMFlag::Flags origin) { 928 julong v; 929 int int_v; 930 intx intx_v; 931 bool is_neg = false; 932 933 if (flag == NULL) { 934 return false; 935 } 936 937 // Check the sign first since atojulong() parses only unsigned values. 938 if (*value == '-') { 939 if (!flag->is_intx() && !flag->is_int()) { 940 return false; 941 } 942 value++; 943 is_neg = true; 944 } 945 if (!Arguments::atojulong(value, &v)) { 946 return false; 947 } 948 if (flag->is_int()) { 949 int_v = (int) v; 950 if (is_neg) { 951 int_v = -int_v; 952 } 953 return JVMFlag::intAtPut(flag, &int_v, origin) == JVMFlag::SUCCESS; 954 } else if (flag->is_uint()) { 955 uint uint_v = (uint) v; 956 return JVMFlag::uintAtPut(flag, &uint_v, origin) == JVMFlag::SUCCESS; 957 } else if (flag->is_intx()) { 958 intx_v = (intx) v; 959 if (is_neg) { 960 intx_v = -intx_v; 961 } 962 return JVMFlag::intxAtPut(flag, &intx_v, origin) == JVMFlag::SUCCESS; 963 } else if (flag->is_uintx()) { 964 uintx uintx_v = (uintx) v; 965 return JVMFlag::uintxAtPut(flag, &uintx_v, origin) == JVMFlag::SUCCESS; 966 } else if (flag->is_uint64_t()) { 967 uint64_t uint64_t_v = (uint64_t) v; 968 return JVMFlag::uint64_tAtPut(flag, &uint64_t_v, origin) == JVMFlag::SUCCESS; 969 } else if (flag->is_size_t()) { 970 size_t size_t_v = (size_t) v; 971 return JVMFlag::size_tAtPut(flag, &size_t_v, origin) == JVMFlag::SUCCESS; 972 } else if (flag->is_double()) { 973 double double_v = (double) v; 974 return JVMFlag::doubleAtPut(flag, &double_v, origin) == JVMFlag::SUCCESS; 975 } else { 976 return false; 977 } 978 } 979 980 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlag::Flags origin) { 981 if (JVMFlag::ccstrAtPut(flag, &value, origin) != JVMFlag::SUCCESS) return false; 982 // Contract: JVMFlag always returns a pointer that needs freeing. 983 FREE_C_HEAP_ARRAY(char, value); 984 return true; 985 } 986 987 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlag::Flags origin) { 988 const char* old_value = ""; 989 if (JVMFlag::ccstrAt(flag, &old_value) != JVMFlag::SUCCESS) return false; 990 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 991 size_t new_len = strlen(new_value); 992 const char* value; 993 char* free_this_too = NULL; 994 if (old_len == 0) { 995 value = new_value; 996 } else if (new_len == 0) { 997 value = old_value; 998 } else { 999 size_t length = old_len + 1 + new_len + 1; 1000 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 1001 // each new setting adds another LINE to the switch: 1002 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 1003 value = buf; 1004 free_this_too = buf; 1005 } 1006 (void) JVMFlag::ccstrAtPut(flag, &value, origin); 1007 // JVMFlag always returns a pointer that needs freeing. 1008 FREE_C_HEAP_ARRAY(char, value); 1009 // JVMFlag made its own copy, so I must delete my own temp. buffer. 1010 FREE_C_HEAP_ARRAY(char, free_this_too); 1011 return true; 1012 } 1013 1014 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 1015 const char* real_name = real_flag_name(arg); 1016 JDK_Version since = JDK_Version(); 1017 switch (is_deprecated_flag(arg, &since)) { 1018 case -1: 1019 return NULL; // obsolete or expired, don't process normally 1020 case 0: 1021 return real_name; 1022 case 1: { 1023 if (warn) { 1024 char version[256]; 1025 since.to_string(version, sizeof(version)); 1026 if (real_name != arg) { 1027 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 1028 arg, version, real_name); 1029 } else { 1030 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 1031 arg, version); 1032 } 1033 } 1034 return real_name; 1035 } 1036 } 1037 ShouldNotReachHere(); 1038 return NULL; 1039 } 1040 1041 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 1042 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 1043 // Set tagset string buffer at max size of 256, large enough for any alias tagset 1044 const int max_tagset_size = 256; 1045 int max_tagset_len = max_tagset_size - 1; 1046 char tagset_buffer[max_tagset_size]; 1047 tagset_buffer[0] = '\0'; 1048 1049 // Write tag-set for aliased logging option, in string list form 1050 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 1051 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 1052 if (i > 0) { 1053 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 1054 } 1055 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 1056 } 1057 if (!alf.exactMatch) { 1058 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 1059 } 1060 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 1061 (on) ? "+" : "-", 1062 name, 1063 tagset_buffer, 1064 (on) ? LogLevel::name(alf.level) : "off"); 1065 } 1066 1067 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 1068 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 1069 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 1070 if (strcmp(alf.alias_name, name) == 0) { 1071 log_deprecated_flag(name, on, alf); 1072 return alf; 1073 } 1074 } 1075 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 1076 return a; 1077 } 1078 1079 bool Arguments::parse_argument(const char* arg, JVMFlag::Flags origin) { 1080 1081 // range of acceptable characters spelled out for portability reasons 1082 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 1083 #define BUFLEN 255 1084 char name[BUFLEN+1]; 1085 char dummy; 1086 const char* real_name; 1087 bool warn_if_deprecated = true; 1088 1089 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1090 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 1091 if (alf.alias_name != NULL){ 1092 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1093 return true; 1094 } 1095 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1096 if (real_name == NULL) { 1097 return false; 1098 } 1099 JVMFlag* flag = JVMFlag::find_flag(real_name); 1100 return set_bool_flag(flag, false, origin); 1101 } 1102 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 1103 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1104 if (alf.alias_name != NULL){ 1105 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1106 return true; 1107 } 1108 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1109 if (real_name == NULL) { 1110 return false; 1111 } 1112 JVMFlag* flag = JVMFlag::find_flag(real_name); 1113 return set_bool_flag(flag, true, origin); 1114 } 1115 1116 char punct; 1117 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 1118 const char* value = strchr(arg, '=') + 1; 1119 1120 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 1121 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 1122 if (alf.alias_name != NULL) { 1123 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 1124 return true; 1125 } 1126 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1127 if (real_name == NULL) { 1128 return false; 1129 } 1130 JVMFlag* flag = JVMFlag::find_flag(real_name); 1131 if (flag != NULL && flag->is_ccstr()) { 1132 if (flag->ccstr_accumulates()) { 1133 return append_to_string_flag(flag, value, origin); 1134 } else { 1135 if (value[0] == '\0') { 1136 value = NULL; 1137 } 1138 return set_string_flag(flag, value, origin); 1139 } 1140 } else { 1141 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 1142 } 1143 } 1144 1145 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 1146 const char* value = strchr(arg, '=') + 1; 1147 // -XX:Foo:=xxx will reset the string flag to the given value. 1148 if (value[0] == '\0') { 1149 value = NULL; 1150 } 1151 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1152 if (real_name == NULL) { 1153 return false; 1154 } 1155 JVMFlag* flag = JVMFlag::find_flag(real_name); 1156 return set_string_flag(flag, value, origin); 1157 } 1158 1159 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 1160 #define SIGNED_NUMBER_RANGE "[-0123456789]" 1161 #define NUMBER_RANGE "[0123456789eE+-]" 1162 char value[BUFLEN + 1]; 1163 char value2[BUFLEN + 1]; 1164 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 1165 // Looks like a floating-point number -- try again with more lenient format string 1166 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 1167 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1168 if (real_name == NULL) { 1169 return false; 1170 } 1171 JVMFlag* flag = JVMFlag::find_flag(real_name); 1172 return set_fp_numeric_flag(flag, value, origin); 1173 } 1174 } 1175 1176 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 1177 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 1178 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 1179 if (real_name == NULL) { 1180 return false; 1181 } 1182 JVMFlag* flag = JVMFlag::find_flag(real_name); 1183 return set_numeric_flag(flag, value, origin); 1184 } 1185 1186 return false; 1187 } 1188 1189 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 1190 assert(bldarray != NULL, "illegal argument"); 1191 1192 if (arg == NULL) { 1193 return; 1194 } 1195 1196 int new_count = *count + 1; 1197 1198 // expand the array and add arg to the last element 1199 if (*bldarray == NULL) { 1200 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 1201 } else { 1202 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 1203 } 1204 (*bldarray)[*count] = os::strdup_check_oom(arg); 1205 *count = new_count; 1206 } 1207 1208 void Arguments::build_jvm_args(const char* arg) { 1209 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1210 } 1211 1212 void Arguments::build_jvm_flags(const char* arg) { 1213 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1214 } 1215 1216 // utility function to return a string that concatenates all 1217 // strings in a given char** array 1218 const char* Arguments::build_resource_string(char** args, int count) { 1219 if (args == NULL || count == 0) { 1220 return NULL; 1221 } 1222 size_t length = 0; 1223 for (int i = 0; i < count; i++) { 1224 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 1225 } 1226 char* s = NEW_RESOURCE_ARRAY(char, length); 1227 char* dst = s; 1228 for (int j = 0; j < count; j++) { 1229 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 1230 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 1231 dst += offset; 1232 length -= offset; 1233 } 1234 return (const char*) s; 1235 } 1236 1237 void Arguments::print_on(outputStream* st) { 1238 st->print_cr("VM Arguments:"); 1239 if (num_jvm_flags() > 0) { 1240 st->print("jvm_flags: "); print_jvm_flags_on(st); 1241 st->cr(); 1242 } 1243 if (num_jvm_args() > 0) { 1244 st->print("jvm_args: "); print_jvm_args_on(st); 1245 st->cr(); 1246 } 1247 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1248 if (_java_class_path != NULL) { 1249 char* path = _java_class_path->value(); 1250 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1251 } 1252 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1253 } 1254 1255 void Arguments::print_summary_on(outputStream* st) { 1256 // Print the command line. Environment variables that are helpful for 1257 // reproducing the problem are written later in the hs_err file. 1258 // flags are from setting file 1259 if (num_jvm_flags() > 0) { 1260 st->print_raw("Settings File: "); 1261 print_jvm_flags_on(st); 1262 st->cr(); 1263 } 1264 // args are the command line and environment variable arguments. 1265 st->print_raw("Command Line: "); 1266 if (num_jvm_args() > 0) { 1267 print_jvm_args_on(st); 1268 } 1269 // this is the classfile and any arguments to the java program 1270 if (java_command() != NULL) { 1271 st->print("%s", java_command()); 1272 } 1273 st->cr(); 1274 } 1275 1276 void Arguments::print_jvm_flags_on(outputStream* st) { 1277 if (_num_jvm_flags > 0) { 1278 for (int i=0; i < _num_jvm_flags; i++) { 1279 st->print("%s ", _jvm_flags_array[i]); 1280 } 1281 } 1282 } 1283 1284 void Arguments::print_jvm_args_on(outputStream* st) { 1285 if (_num_jvm_args > 0) { 1286 for (int i=0; i < _num_jvm_args; i++) { 1287 st->print("%s ", _jvm_args_array[i]); 1288 } 1289 } 1290 } 1291 1292 bool Arguments::process_argument(const char* arg, 1293 jboolean ignore_unrecognized, 1294 JVMFlag::Flags origin) { 1295 JDK_Version since = JDK_Version(); 1296 1297 if (parse_argument(arg, origin)) { 1298 return true; 1299 } 1300 1301 // Determine if the flag has '+', '-', or '=' characters. 1302 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1303 const char* const argname = has_plus_minus ? arg + 1 : arg; 1304 1305 size_t arg_len; 1306 const char* equal_sign = strchr(argname, '='); 1307 if (equal_sign == NULL) { 1308 arg_len = strlen(argname); 1309 } else { 1310 arg_len = equal_sign - argname; 1311 } 1312 1313 // Only make the obsolete check for valid arguments. 1314 if (arg_len <= BUFLEN) { 1315 // Construct a string which consists only of the argument name without '+', '-', or '='. 1316 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1317 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1318 if (is_obsolete_flag(stripped_argname, &since)) { 1319 char version[256]; 1320 since.to_string(version, sizeof(version)); 1321 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1322 return true; 1323 } 1324 #ifndef PRODUCT 1325 else { 1326 const char* replacement; 1327 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1328 log_warning(arguments)("%s has been removed. Please use %s instead.", 1329 stripped_argname, 1330 replacement); 1331 return false; 1332 } 1333 } 1334 #endif //PRODUCT 1335 } 1336 1337 // For locked flags, report a custom error message if available. 1338 // Otherwise, report the standard unrecognized VM option. 1339 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1340 if (found_flag != NULL) { 1341 char locked_message_buf[BUFLEN]; 1342 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1343 if (strlen(locked_message_buf) == 0) { 1344 if (found_flag->is_bool() && !has_plus_minus) { 1345 jio_fprintf(defaultStream::error_stream(), 1346 "Missing +/- setting for VM option '%s'\n", argname); 1347 } else if (!found_flag->is_bool() && has_plus_minus) { 1348 jio_fprintf(defaultStream::error_stream(), 1349 "Unexpected +/- setting in VM option '%s'\n", argname); 1350 } else { 1351 jio_fprintf(defaultStream::error_stream(), 1352 "Improperly specified VM option '%s'\n", argname); 1353 } 1354 } else { 1355 #ifdef PRODUCT 1356 bool mismatched = ((msg_type == JVMFlag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1357 (msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1358 if (ignore_unrecognized && mismatched) { 1359 return true; 1360 } 1361 #endif 1362 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1363 } 1364 } else { 1365 if (ignore_unrecognized) { 1366 return true; 1367 } 1368 jio_fprintf(defaultStream::error_stream(), 1369 "Unrecognized VM option '%s'\n", argname); 1370 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1371 if (fuzzy_matched != NULL) { 1372 jio_fprintf(defaultStream::error_stream(), 1373 "Did you mean '%s%s%s'? ", 1374 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1375 fuzzy_matched->_name, 1376 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1377 } 1378 } 1379 1380 // allow for commandline "commenting out" options like -XX:#+Verbose 1381 return arg[0] == '#'; 1382 } 1383 1384 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1385 FILE* stream = fopen(file_name, "rb"); 1386 if (stream == NULL) { 1387 if (should_exist) { 1388 jio_fprintf(defaultStream::error_stream(), 1389 "Could not open settings file %s\n", file_name); 1390 return false; 1391 } else { 1392 return true; 1393 } 1394 } 1395 1396 char token[1024]; 1397 int pos = 0; 1398 1399 bool in_white_space = true; 1400 bool in_comment = false; 1401 bool in_quote = false; 1402 char quote_c = 0; 1403 bool result = true; 1404 1405 int c = getc(stream); 1406 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1407 if (in_white_space) { 1408 if (in_comment) { 1409 if (c == '\n') in_comment = false; 1410 } else { 1411 if (c == '#') in_comment = true; 1412 else if (!isspace(c)) { 1413 in_white_space = false; 1414 token[pos++] = c; 1415 } 1416 } 1417 } else { 1418 if (c == '\n' || (!in_quote && isspace(c))) { 1419 // token ends at newline, or at unquoted whitespace 1420 // this allows a way to include spaces in string-valued options 1421 token[pos] = '\0'; 1422 logOption(token); 1423 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1424 build_jvm_flags(token); 1425 pos = 0; 1426 in_white_space = true; 1427 in_quote = false; 1428 } else if (!in_quote && (c == '\'' || c == '"')) { 1429 in_quote = true; 1430 quote_c = c; 1431 } else if (in_quote && (c == quote_c)) { 1432 in_quote = false; 1433 } else { 1434 token[pos++] = c; 1435 } 1436 } 1437 c = getc(stream); 1438 } 1439 if (pos > 0) { 1440 token[pos] = '\0'; 1441 result &= process_argument(token, ignore_unrecognized, JVMFlag::CONFIG_FILE); 1442 build_jvm_flags(token); 1443 } 1444 fclose(stream); 1445 return result; 1446 } 1447 1448 //============================================================================================================= 1449 // Parsing of properties (-D) 1450 1451 const char* Arguments::get_property(const char* key) { 1452 return PropertyList_get_value(system_properties(), key); 1453 } 1454 1455 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1456 const char* eq = strchr(prop, '='); 1457 const char* key; 1458 const char* value = ""; 1459 1460 if (eq == NULL) { 1461 // property doesn't have a value, thus use passed string 1462 key = prop; 1463 } else { 1464 // property have a value, thus extract it and save to the 1465 // allocated string 1466 size_t key_len = eq - prop; 1467 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1468 1469 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1470 key = tmp_key; 1471 1472 value = &prop[key_len + 1]; 1473 } 1474 1475 if (strcmp(key, "java.compiler") == 0) { 1476 process_java_compiler_argument(value); 1477 // Record value in Arguments, but let it get passed to Java. 1478 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1479 // sun.java.launcher.is_altjvm property is 1480 // private and is processed in process_sun_java_launcher_properties(); 1481 // the sun.java.launcher property is passed on to the java application 1482 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1483 // append is true, writable is true, internal is false 1484 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1485 WriteableProperty, ExternalProperty); 1486 } else { 1487 if (strcmp(key, "sun.java.command") == 0) { 1488 char *old_java_command = _java_command; 1489 _java_command = os::strdup_check_oom(value, mtArguments); 1490 if (old_java_command != NULL) { 1491 os::free(old_java_command); 1492 } 1493 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1494 // If this property is set on the command line then its value will be 1495 // displayed in VM error logs as the URL at which to submit such logs. 1496 // Normally the URL displayed in error logs is different from the value 1497 // of this system property, so a different property should have been 1498 // used here, but we leave this as-is in case someone depends upon it. 1499 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1500 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1501 // its value without going through the property list or making a Java call. 1502 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1503 if (old_java_vendor_url_bug != NULL) { 1504 os::free((void *)old_java_vendor_url_bug); 1505 } 1506 } 1507 1508 // Create new property and add at the end of the list 1509 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1510 } 1511 1512 if (key != prop) { 1513 // SystemProperty copy passed value, thus free previously allocated 1514 // memory 1515 FreeHeap((void *)key); 1516 } 1517 1518 return true; 1519 } 1520 1521 #if INCLUDE_CDS 1522 const char* unsupported_properties[] = { "jdk.module.limitmods", 1523 "jdk.module.upgrade.path", 1524 "jdk.module.patch.0" }; 1525 const char* unsupported_options[] = { "--limit-modules", 1526 "--upgrade-module-path", 1527 "--patch-module" 1528 }; 1529 void Arguments::check_unsupported_dumping_properties() { 1530 assert(is_dumping_archive(), 1531 "this function is only used with CDS dump time"); 1532 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1533 // If a vm option is found in the unsupported_options array, vm will exit with an error message. 1534 SystemProperty* sp = system_properties(); 1535 while (sp != NULL) { 1536 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1537 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1538 vm_exit_during_initialization( 1539 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1540 } 1541 } 1542 sp = sp->next(); 1543 } 1544 1545 // Check for an exploded module build in use with -Xshare:dump. 1546 if (!has_jimage()) { 1547 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1548 } 1549 } 1550 1551 bool Arguments::check_unsupported_cds_runtime_properties() { 1552 assert(UseSharedSpaces, "this function is only used with -Xshare:{on,auto}"); 1553 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1554 if (ArchiveClassesAtExit != NULL) { 1555 // dynamic dumping, just return false for now. 1556 // check_unsupported_dumping_properties() will be called later to check the same set of 1557 // properties, and will exit the VM with the correct error message if the unsupported properties 1558 // are used. 1559 return false; 1560 } 1561 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1562 if (get_property(unsupported_properties[i]) != NULL) { 1563 if (RequireSharedSpaces) { 1564 warning("CDS is disabled when the %s option is specified.", unsupported_options[i]); 1565 } 1566 return true; 1567 } 1568 } 1569 return false; 1570 } 1571 #endif 1572 1573 //=========================================================================================================== 1574 // Setting int/mixed/comp mode flags 1575 1576 void Arguments::set_mode_flags(Mode mode) { 1577 // Set up default values for all flags. 1578 // If you add a flag to any of the branches below, 1579 // add a default value for it here. 1580 set_java_compiler(false); 1581 _mode = mode; 1582 1583 // Ensure Agent_OnLoad has the correct initial values. 1584 // This may not be the final mode; mode may change later in onload phase. 1585 PropertyList_unique_add(&_system_properties, "java.vm.info", 1586 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1587 1588 UseInterpreter = true; 1589 UseCompiler = true; 1590 UseLoopCounter = true; 1591 1592 // Default values may be platform/compiler dependent - 1593 // use the saved values 1594 ClipInlining = Arguments::_ClipInlining; 1595 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1596 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1597 BackgroundCompilation = Arguments::_BackgroundCompilation; 1598 if (TieredCompilation) { 1599 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1600 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1601 } 1602 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1603 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1604 } 1605 } 1606 1607 // Change from defaults based on mode 1608 switch (mode) { 1609 default: 1610 ShouldNotReachHere(); 1611 break; 1612 case _int: 1613 UseCompiler = false; 1614 UseLoopCounter = false; 1615 AlwaysCompileLoopMethods = false; 1616 UseOnStackReplacement = false; 1617 break; 1618 case _mixed: 1619 // same as default 1620 break; 1621 case _comp: 1622 UseInterpreter = false; 1623 BackgroundCompilation = false; 1624 ClipInlining = false; 1625 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1626 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1627 // compile a level 4 (C2) and then continue executing it. 1628 if (TieredCompilation) { 1629 Tier3InvokeNotifyFreqLog = 0; 1630 Tier4InvocationThreshold = 0; 1631 } 1632 break; 1633 } 1634 } 1635 1636 // Conflict: required to use shared spaces (-Xshare:on), but 1637 // incompatible command line options were chosen. 1638 static void no_shared_spaces(const char* message) { 1639 if (RequireSharedSpaces) { 1640 jio_fprintf(defaultStream::error_stream(), 1641 "Class data sharing is inconsistent with other specified options.\n"); 1642 vm_exit_during_initialization("Unable to use shared archive", message); 1643 } else { 1644 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1645 } 1646 } 1647 1648 void set_object_alignment() { 1649 // Object alignment. 1650 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1651 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1652 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1653 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1654 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1655 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1656 1657 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1658 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1659 1660 // Oop encoding heap max 1661 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1662 1663 if (SurvivorAlignmentInBytes == 0) { 1664 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1665 } 1666 } 1667 1668 size_t Arguments::max_heap_for_compressed_oops() { 1669 // Avoid sign flip. 1670 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1671 // We need to fit both the NULL page and the heap into the memory budget, while 1672 // keeping alignment constraints of the heap. To guarantee the latter, as the 1673 // NULL page is located before the heap, we pad the NULL page to the conservative 1674 // maximum alignment that the GC may ever impose upon the heap. 1675 size_t displacement_due_to_null_page = align_up((size_t)os::vm_page_size(), 1676 _conservative_max_heap_alignment); 1677 1678 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1679 NOT_LP64(ShouldNotReachHere(); return 0); 1680 } 1681 1682 void Arguments::set_use_compressed_oops() { 1683 #ifndef ZERO 1684 #ifdef _LP64 1685 // MaxHeapSize is not set up properly at this point, but 1686 // the only value that can override MaxHeapSize if we are 1687 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1688 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1689 1690 if (max_heap_size <= max_heap_for_compressed_oops()) { 1691 #if !defined(COMPILER1) || defined(TIERED) 1692 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1693 FLAG_SET_ERGO(UseCompressedOops, true); 1694 } 1695 #endif 1696 } else { 1697 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1698 warning("Max heap size too large for Compressed Oops"); 1699 FLAG_SET_DEFAULT(UseCompressedOops, false); 1700 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1701 } 1702 } 1703 #endif // _LP64 1704 #endif // ZERO 1705 } 1706 1707 1708 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1709 // set_use_compressed_oops(). 1710 void Arguments::set_use_compressed_klass_ptrs() { 1711 #ifndef ZERO 1712 #ifdef _LP64 1713 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1714 if (!UseCompressedOops) { 1715 if (UseCompressedClassPointers) { 1716 warning("UseCompressedClassPointers requires UseCompressedOops"); 1717 } 1718 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1719 } else { 1720 // Turn on UseCompressedClassPointers too 1721 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1722 FLAG_SET_ERGO(UseCompressedClassPointers, true); 1723 } 1724 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1725 if (UseCompressedClassPointers) { 1726 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1727 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1728 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1729 } 1730 } 1731 } 1732 #endif // _LP64 1733 #endif // !ZERO 1734 } 1735 1736 void Arguments::set_conservative_max_heap_alignment() { 1737 // The conservative maximum required alignment for the heap is the maximum of 1738 // the alignments imposed by several sources: any requirements from the heap 1739 // itself and the maximum page size we may run the VM with. 1740 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1741 _conservative_max_heap_alignment = MAX4(heap_alignment, 1742 (size_t)os::vm_allocation_granularity(), 1743 os::max_page_size(), 1744 GCArguments::compute_heap_alignment()); 1745 } 1746 1747 jint Arguments::set_ergonomics_flags() { 1748 GCConfig::initialize(); 1749 1750 set_conservative_max_heap_alignment(); 1751 1752 #ifndef ZERO 1753 #ifdef _LP64 1754 set_use_compressed_oops(); 1755 1756 // set_use_compressed_klass_ptrs() must be called after calling 1757 // set_use_compressed_oops(). 1758 set_use_compressed_klass_ptrs(); 1759 1760 // Also checks that certain machines are slower with compressed oops 1761 // in vm_version initialization code. 1762 #endif // _LP64 1763 #endif // !ZERO 1764 1765 return JNI_OK; 1766 } 1767 1768 julong Arguments::limit_by_allocatable_memory(julong limit) { 1769 julong max_allocatable; 1770 julong result = limit; 1771 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1772 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 1773 } 1774 return result; 1775 } 1776 1777 // Use static initialization to get the default before parsing 1778 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1779 1780 void Arguments::set_heap_size() { 1781 julong phys_mem; 1782 1783 // If the user specified one of these options, they 1784 // want specific memory sizing so do not limit memory 1785 // based on compressed oops addressability. 1786 // Also, memory limits will be calculated based on 1787 // available os physical memory, not our MaxRAM limit, 1788 // unless MaxRAM is also specified. 1789 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1790 !FLAG_IS_DEFAULT(MaxRAMFraction) || 1791 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1792 !FLAG_IS_DEFAULT(MinRAMFraction) || 1793 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1794 !FLAG_IS_DEFAULT(InitialRAMFraction) || 1795 !FLAG_IS_DEFAULT(MaxRAM)); 1796 if (override_coop_limit) { 1797 if (FLAG_IS_DEFAULT(MaxRAM)) { 1798 phys_mem = os::physical_memory(); 1799 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1800 } else { 1801 phys_mem = (julong)MaxRAM; 1802 } 1803 } else { 1804 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1805 : (julong)MaxRAM; 1806 } 1807 1808 1809 // Convert deprecated flags 1810 if (FLAG_IS_DEFAULT(MaxRAMPercentage) && 1811 !FLAG_IS_DEFAULT(MaxRAMFraction)) 1812 MaxRAMPercentage = 100.0 / MaxRAMFraction; 1813 1814 if (FLAG_IS_DEFAULT(MinRAMPercentage) && 1815 !FLAG_IS_DEFAULT(MinRAMFraction)) 1816 MinRAMPercentage = 100.0 / MinRAMFraction; 1817 1818 if (FLAG_IS_DEFAULT(InitialRAMPercentage) && 1819 !FLAG_IS_DEFAULT(InitialRAMFraction)) 1820 InitialRAMPercentage = 100.0 / InitialRAMFraction; 1821 1822 // If the maximum heap size has not been set with -Xmx, 1823 // then set it as fraction of the size of physical memory, 1824 // respecting the maximum and minimum sizes of the heap. 1825 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1826 julong reasonable_max = (julong)((phys_mem * MaxRAMPercentage) / 100); 1827 const julong reasonable_min = (julong)((phys_mem * MinRAMPercentage) / 100); 1828 if (reasonable_min < MaxHeapSize) { 1829 // Small physical memory, so use a minimum fraction of it for the heap 1830 reasonable_max = reasonable_min; 1831 } else { 1832 // Not-small physical memory, so require a heap at least 1833 // as large as MaxHeapSize 1834 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1835 } 1836 1837 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1838 // Limit the heap size to ErgoHeapSizeLimit 1839 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1840 } 1841 1842 #ifdef _LP64 1843 if (UseCompressedOops) { 1844 // Limit the heap size to the maximum possible when using compressed oops 1845 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1846 1847 // HeapBaseMinAddress can be greater than default but not less than. 1848 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1849 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1850 // matches compressed oops printing flags 1851 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1852 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1853 DefaultHeapBaseMinAddress, 1854 DefaultHeapBaseMinAddress/G, 1855 HeapBaseMinAddress); 1856 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1857 } 1858 } 1859 1860 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1861 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1862 // but it should be not less than default MaxHeapSize. 1863 max_coop_heap -= HeapBaseMinAddress; 1864 } 1865 1866 // If user specified flags prioritizing os physical 1867 // memory limits, then disable compressed oops if 1868 // limits exceed max_coop_heap and UseCompressedOops 1869 // was not specified. 1870 if (reasonable_max > max_coop_heap) { 1871 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1872 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1873 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1874 "Please check the setting of MaxRAMPercentage %5.2f." 1875 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1876 FLAG_SET_ERGO(UseCompressedOops, false); 1877 FLAG_SET_ERGO(UseCompressedClassPointers, false); 1878 } else { 1879 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1880 } 1881 } 1882 } 1883 #endif // _LP64 1884 1885 reasonable_max = limit_by_allocatable_memory(reasonable_max); 1886 1887 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1888 // An initial heap size was specified on the command line, 1889 // so be sure that the maximum size is consistent. Done 1890 // after call to limit_by_allocatable_memory because that 1891 // method might reduce the allocation size. 1892 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1893 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1894 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1895 } 1896 1897 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1898 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1899 } 1900 1901 // If the minimum or initial heap_size have not been set or requested to be set 1902 // ergonomically, set them accordingly. 1903 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1904 julong reasonable_minimum = (julong)(OldSize + NewSize); 1905 1906 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1907 1908 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 1909 1910 if (InitialHeapSize == 0) { 1911 julong reasonable_initial = (julong)((phys_mem * InitialRAMPercentage) / 100); 1912 1913 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1914 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1915 1916 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 1917 1918 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1919 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1920 } 1921 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1922 // synchronize with InitialHeapSize to avoid errors with the default value. 1923 if (MinHeapSize == 0) { 1924 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1925 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1926 } 1927 } 1928 } 1929 1930 // This option inspects the machine and attempts to set various 1931 // parameters to be optimal for long-running, memory allocation 1932 // intensive jobs. It is intended for machines with large 1933 // amounts of cpu and memory. 1934 jint Arguments::set_aggressive_heap_flags() { 1935 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1936 // VM, but we may not be able to represent the total physical memory 1937 // available (like having 8gb of memory on a box but using a 32bit VM). 1938 // Thus, we need to make sure we're using a julong for intermediate 1939 // calculations. 1940 julong initHeapSize; 1941 julong total_memory = os::physical_memory(); 1942 1943 if (total_memory < (julong) 256 * M) { 1944 jio_fprintf(defaultStream::error_stream(), 1945 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1946 vm_exit(1); 1947 } 1948 1949 // The heap size is half of available memory, or (at most) 1950 // all of possible memory less 160mb (leaving room for the OS 1951 // when using ISM). This is the maximum; because adaptive sizing 1952 // is turned on below, the actual space used may be smaller. 1953 1954 initHeapSize = MIN2(total_memory / (julong) 2, 1955 total_memory - (julong) 160 * M); 1956 1957 initHeapSize = limit_by_allocatable_memory(initHeapSize); 1958 1959 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1960 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1961 return JNI_EINVAL; 1962 } 1963 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1964 return JNI_EINVAL; 1965 } 1966 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1967 return JNI_EINVAL; 1968 } 1969 } 1970 if (FLAG_IS_DEFAULT(NewSize)) { 1971 // Make the young generation 3/8ths of the total heap. 1972 if (FLAG_SET_CMDLINE(NewSize, 1973 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1974 return JNI_EINVAL; 1975 } 1976 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1977 return JNI_EINVAL; 1978 } 1979 } 1980 1981 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1982 FLAG_SET_DEFAULT(UseLargePages, true); 1983 #endif 1984 1985 // Increase some data structure sizes for efficiency 1986 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1987 return JNI_EINVAL; 1988 } 1989 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1990 return JNI_EINVAL; 1991 } 1992 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1993 return JNI_EINVAL; 1994 } 1995 1996 // See the OldPLABSize comment below, but replace 'after promotion' 1997 // with 'after copying'. YoungPLABSize is the size of the survivor 1998 // space per-gc-thread buffers. The default is 4kw. 1999 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 2000 return JNI_EINVAL; 2001 } 2002 2003 // OldPLABSize is the size of the buffers in the old gen that 2004 // UseParallelGC uses to promote live data that doesn't fit in the 2005 // survivor spaces. At any given time, there's one for each gc thread. 2006 // The default size is 1kw. These buffers are rarely used, since the 2007 // survivor spaces are usually big enough. For specjbb, however, there 2008 // are occasions when there's lots of live data in the young gen 2009 // and we end up promoting some of it. We don't have a definite 2010 // explanation for why bumping OldPLABSize helps, but the theory 2011 // is that a bigger PLAB results in retaining something like the 2012 // original allocation order after promotion, which improves mutator 2013 // locality. A minor effect may be that larger PLABs reduce the 2014 // number of PLAB allocation events during gc. The value of 8kw 2015 // was arrived at by experimenting with specjbb. 2016 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 2017 return JNI_EINVAL; 2018 } 2019 2020 // Enable parallel GC and adaptive generation sizing 2021 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 2022 return JNI_EINVAL; 2023 } 2024 2025 // Encourage steady state memory management 2026 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 2027 return JNI_EINVAL; 2028 } 2029 2030 // This appears to improve mutator locality 2031 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 2032 return JNI_EINVAL; 2033 } 2034 2035 return JNI_OK; 2036 } 2037 2038 // This must be called after ergonomics. 2039 void Arguments::set_bytecode_flags() { 2040 if (!RewriteBytecodes) { 2041 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2042 } 2043 } 2044 2045 // Aggressive optimization flags 2046 jint Arguments::set_aggressive_opts_flags() { 2047 #ifdef COMPILER2 2048 if (AggressiveUnboxing) { 2049 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2050 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2051 } else if (!EliminateAutoBox) { 2052 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2053 AggressiveUnboxing = false; 2054 } 2055 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2056 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2057 } else if (!DoEscapeAnalysis) { 2058 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2059 AggressiveUnboxing = false; 2060 } 2061 } 2062 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2063 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2064 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2065 } 2066 // Feed the cache size setting into the JDK 2067 char buffer[1024]; 2068 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2069 if (!add_property(buffer)) { 2070 return JNI_ENOMEM; 2071 } 2072 } 2073 #endif 2074 2075 return JNI_OK; 2076 } 2077 2078 //=========================================================================================================== 2079 // Parsing of java.compiler property 2080 2081 void Arguments::process_java_compiler_argument(const char* arg) { 2082 // For backwards compatibility, Djava.compiler=NONE or "" 2083 // causes us to switch to -Xint mode UNLESS -Xdebug 2084 // is also specified. 2085 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2086 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2087 } 2088 } 2089 2090 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2091 _sun_java_launcher = os::strdup_check_oom(launcher); 2092 } 2093 2094 bool Arguments::created_by_java_launcher() { 2095 assert(_sun_java_launcher != NULL, "property must have value"); 2096 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2097 } 2098 2099 bool Arguments::sun_java_launcher_is_altjvm() { 2100 return _sun_java_launcher_is_altjvm; 2101 } 2102 2103 //=========================================================================================================== 2104 // Parsing of main arguments 2105 2106 unsigned int addreads_count = 0; 2107 unsigned int addexports_count = 0; 2108 unsigned int addopens_count = 0; 2109 unsigned int addmods_count = 0; 2110 unsigned int patch_mod_count = 0; 2111 2112 // Check the consistency of vm_init_args 2113 bool Arguments::check_vm_args_consistency() { 2114 // Method for adding checks for flag consistency. 2115 // The intent is to warn the user of all possible conflicts, 2116 // before returning an error. 2117 // Note: Needs platform-dependent factoring. 2118 bool status = true; 2119 2120 if (TLABRefillWasteFraction == 0) { 2121 jio_fprintf(defaultStream::error_stream(), 2122 "TLABRefillWasteFraction should be a denominator, " 2123 "not " SIZE_FORMAT "\n", 2124 TLABRefillWasteFraction); 2125 status = false; 2126 } 2127 2128 if (PrintNMTStatistics) { 2129 #if INCLUDE_NMT 2130 if (MemTracker::tracking_level() == NMT_off) { 2131 #endif // INCLUDE_NMT 2132 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2133 PrintNMTStatistics = false; 2134 #if INCLUDE_NMT 2135 } 2136 #endif 2137 } 2138 2139 status = CompilerConfig::check_args_consistency(status); 2140 #if INCLUDE_JVMCI 2141 if (status && EnableJVMCI) { 2142 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 2143 AddProperty, UnwriteableProperty, InternalProperty); 2144 if (!create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 2145 return false; 2146 } 2147 } 2148 #endif 2149 2150 #ifndef SUPPORT_RESERVED_STACK_AREA 2151 if (StackReservedPages != 0) { 2152 FLAG_SET_CMDLINE(StackReservedPages, 0); 2153 warning("Reserved Stack Area not supported on this platform"); 2154 } 2155 #endif 2156 2157 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 2158 if ((UseNUMAInterleaving && !FLAG_IS_DEFAULT(UseNUMAInterleaving)) || (UseNUMA && !FLAG_IS_DEFAULT(UseNUMA))) { 2159 log_warning(arguments) ("NUMA support for Heap depends on the file system when AllocateHeapAt option is used.\n"); 2160 } 2161 } 2162 2163 status = status && GCArguments::check_args_consistency(); 2164 2165 return status; 2166 } 2167 2168 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2169 const char* option_type) { 2170 if (ignore) return false; 2171 2172 const char* spacer = " "; 2173 if (option_type == NULL) { 2174 option_type = ++spacer; // Set both to the empty string. 2175 } 2176 2177 jio_fprintf(defaultStream::error_stream(), 2178 "Unrecognized %s%soption: %s\n", option_type, spacer, 2179 option->optionString); 2180 return true; 2181 } 2182 2183 static const char* user_assertion_options[] = { 2184 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2185 }; 2186 2187 static const char* system_assertion_options[] = { 2188 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2189 }; 2190 2191 bool Arguments::parse_uintx(const char* value, 2192 uintx* uintx_arg, 2193 uintx min_size) { 2194 2195 // Check the sign first since atojulong() parses only unsigned values. 2196 bool value_is_positive = !(*value == '-'); 2197 2198 if (value_is_positive) { 2199 julong n; 2200 bool good_return = atojulong(value, &n); 2201 if (good_return) { 2202 bool above_minimum = n >= min_size; 2203 bool value_is_too_large = n > max_uintx; 2204 2205 if (above_minimum && !value_is_too_large) { 2206 *uintx_arg = n; 2207 return true; 2208 } 2209 } 2210 } 2211 return false; 2212 } 2213 2214 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2215 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2216 char* property = AllocateHeap(prop_len, mtArguments); 2217 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2218 if (ret < 0 || ret >= (int)prop_len) { 2219 FreeHeap(property); 2220 return false; 2221 } 2222 bool added = add_property(property, UnwriteableProperty, internal); 2223 FreeHeap(property); 2224 return added; 2225 } 2226 2227 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2228 const unsigned int props_count_limit = 1000; 2229 const int max_digits = 3; 2230 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2231 2232 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2233 if (count < props_count_limit) { 2234 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 2235 char* property = AllocateHeap(prop_len, mtArguments); 2236 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2237 if (ret < 0 || ret >= (int)prop_len) { 2238 FreeHeap(property); 2239 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2240 return false; 2241 } 2242 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2243 FreeHeap(property); 2244 return added; 2245 } 2246 2247 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2248 return false; 2249 } 2250 2251 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2252 julong* long_arg, 2253 julong min_size, 2254 julong max_size) { 2255 if (!atojulong(s, long_arg)) return arg_unreadable; 2256 return check_memory_size(*long_arg, min_size, max_size); 2257 } 2258 2259 // Parse JavaVMInitArgs structure 2260 2261 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 2262 const JavaVMInitArgs *java_tool_options_args, 2263 const JavaVMInitArgs *java_options_args, 2264 const JavaVMInitArgs *cmd_line_args) { 2265 bool patch_mod_javabase = false; 2266 2267 // Save default settings for some mode flags 2268 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2269 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2270 Arguments::_ClipInlining = ClipInlining; 2271 Arguments::_BackgroundCompilation = BackgroundCompilation; 2272 if (TieredCompilation) { 2273 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2274 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2275 } 2276 2277 // Setup flags for mixed which is the default 2278 set_mode_flags(_mixed); 2279 2280 // Parse args structure generated from java.base vm options resource 2281 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlag::JIMAGE_RESOURCE); 2282 if (result != JNI_OK) { 2283 return result; 2284 } 2285 2286 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2287 // variable (if present). 2288 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2289 if (result != JNI_OK) { 2290 return result; 2291 } 2292 2293 // Parse args structure generated from the command line flags. 2294 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlag::COMMAND_LINE); 2295 if (result != JNI_OK) { 2296 return result; 2297 } 2298 2299 // Parse args structure generated from the _JAVA_OPTIONS environment 2300 // variable (if present) (mimics classic VM) 2301 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlag::ENVIRON_VAR); 2302 if (result != JNI_OK) { 2303 return result; 2304 } 2305 2306 // We need to ensure processor and memory resources have been properly 2307 // configured - which may rely on arguments we just processed - before 2308 // doing the final argument processing. Any argument processing that 2309 // needs to know about processor and memory resources must occur after 2310 // this point. 2311 2312 os::init_container_support(); 2313 2314 // Do final processing now that all arguments have been parsed 2315 result = finalize_vm_init_args(patch_mod_javabase); 2316 if (result != JNI_OK) { 2317 return result; 2318 } 2319 2320 return JNI_OK; 2321 } 2322 2323 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2324 // represents a valid JDWP agent. is_path==true denotes that we 2325 // are dealing with -agentpath (case where name is a path), otherwise with 2326 // -agentlib 2327 bool valid_jdwp_agent(char *name, bool is_path) { 2328 char *_name; 2329 const char *_jdwp = "jdwp"; 2330 size_t _len_jdwp, _len_prefix; 2331 2332 if (is_path) { 2333 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2334 return false; 2335 } 2336 2337 _name++; // skip past last path separator 2338 _len_prefix = strlen(JNI_LIB_PREFIX); 2339 2340 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2341 return false; 2342 } 2343 2344 _name += _len_prefix; 2345 _len_jdwp = strlen(_jdwp); 2346 2347 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2348 _name += _len_jdwp; 2349 } 2350 else { 2351 return false; 2352 } 2353 2354 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2355 return false; 2356 } 2357 2358 return true; 2359 } 2360 2361 if (strcmp(name, _jdwp) == 0) { 2362 return true; 2363 } 2364 2365 return false; 2366 } 2367 2368 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2369 // --patch-module=<module>=<file>(<pathsep><file>)* 2370 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2371 // Find the equal sign between the module name and the path specification 2372 const char* module_equal = strchr(patch_mod_tail, '='); 2373 if (module_equal == NULL) { 2374 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2375 return JNI_ERR; 2376 } else { 2377 // Pick out the module name 2378 size_t module_len = module_equal - patch_mod_tail; 2379 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2380 if (module_name != NULL) { 2381 memcpy(module_name, patch_mod_tail, module_len); 2382 *(module_name + module_len) = '\0'; 2383 // The path piece begins one past the module_equal sign 2384 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2385 FREE_C_HEAP_ARRAY(char, module_name); 2386 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2387 return JNI_ENOMEM; 2388 } 2389 } else { 2390 return JNI_ENOMEM; 2391 } 2392 } 2393 return JNI_OK; 2394 } 2395 2396 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2397 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2398 // The min and max sizes match the values in globals.hpp, but scaled 2399 // with K. The values have been chosen so that alignment with page 2400 // size doesn't change the max value, which makes the conversions 2401 // back and forth between Xss value and ThreadStackSize value easier. 2402 // The values have also been chosen to fit inside a 32-bit signed type. 2403 const julong min_ThreadStackSize = 0; 2404 const julong max_ThreadStackSize = 1 * M; 2405 2406 const julong min_size = min_ThreadStackSize * K; 2407 const julong max_size = max_ThreadStackSize * K; 2408 2409 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2410 2411 julong size = 0; 2412 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2413 if (errcode != arg_in_range) { 2414 bool silent = (option == NULL); // Allow testing to silence error messages 2415 if (!silent) { 2416 jio_fprintf(defaultStream::error_stream(), 2417 "Invalid thread stack size: %s\n", option->optionString); 2418 describe_range_error(errcode); 2419 } 2420 return JNI_EINVAL; 2421 } 2422 2423 // Internally track ThreadStackSize in units of 1024 bytes. 2424 const julong size_aligned = align_up(size, K); 2425 assert(size <= size_aligned, 2426 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2427 size, size_aligned); 2428 2429 const julong size_in_K = size_aligned / K; 2430 assert(size_in_K < (julong)max_intx, 2431 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2432 size_in_K); 2433 2434 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2435 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2436 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2437 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2438 max_expanded, size_in_K); 2439 2440 *out_ThreadStackSize = (intx)size_in_K; 2441 2442 return JNI_OK; 2443 } 2444 2445 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlag::Flags origin) { 2446 // For match_option to return remaining or value part of option string 2447 const char* tail; 2448 2449 // iterate over arguments 2450 for (int index = 0; index < args->nOptions; index++) { 2451 bool is_absolute_path = false; // for -agentpath vs -agentlib 2452 2453 const JavaVMOption* option = args->options + index; 2454 2455 if (!match_option(option, "-Djava.class.path", &tail) && 2456 !match_option(option, "-Dsun.java.command", &tail) && 2457 !match_option(option, "-Dsun.java.launcher", &tail)) { 2458 2459 // add all jvm options to the jvm_args string. This string 2460 // is used later to set the java.vm.args PerfData string constant. 2461 // the -Djava.class.path and the -Dsun.java.command options are 2462 // omitted from jvm_args string as each have their own PerfData 2463 // string constant object. 2464 build_jvm_args(option->optionString); 2465 } 2466 2467 // -verbose:[class/module/gc/jni] 2468 if (match_option(option, "-verbose", &tail)) { 2469 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2470 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2471 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2472 } else if (!strcmp(tail, ":module")) { 2473 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2474 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2475 } else if (!strcmp(tail, ":gc")) { 2476 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2477 } else if (!strcmp(tail, ":jni")) { 2478 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2479 } 2480 // -da / -ea / -disableassertions / -enableassertions 2481 // These accept an optional class/package name separated by a colon, e.g., 2482 // -da:java.lang.Thread. 2483 } else if (match_option(option, user_assertion_options, &tail, true)) { 2484 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2485 if (*tail == '\0') { 2486 JavaAssertions::setUserClassDefault(enable); 2487 } else { 2488 assert(*tail == ':', "bogus match by match_option()"); 2489 JavaAssertions::addOption(tail + 1, enable); 2490 } 2491 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2492 } else if (match_option(option, system_assertion_options, &tail, false)) { 2493 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2494 JavaAssertions::setSystemClassDefault(enable); 2495 // -bootclasspath: 2496 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2497 jio_fprintf(defaultStream::output_stream(), 2498 "-Xbootclasspath is no longer a supported option.\n"); 2499 return JNI_EINVAL; 2500 // -bootclasspath/a: 2501 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2502 Arguments::append_sysclasspath(tail); 2503 // -bootclasspath/p: 2504 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2505 jio_fprintf(defaultStream::output_stream(), 2506 "-Xbootclasspath/p is no longer a supported option.\n"); 2507 return JNI_EINVAL; 2508 // -Xrun 2509 } else if (match_option(option, "-Xrun", &tail)) { 2510 if (tail != NULL) { 2511 const char* pos = strchr(tail, ':'); 2512 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2513 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2514 jio_snprintf(name, len + 1, "%s", tail); 2515 2516 char *options = NULL; 2517 if(pos != NULL) { 2518 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2519 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2520 } 2521 #if !INCLUDE_JVMTI 2522 if (strcmp(name, "jdwp") == 0) { 2523 jio_fprintf(defaultStream::error_stream(), 2524 "Debugging agents are not supported in this VM\n"); 2525 return JNI_ERR; 2526 } 2527 #endif // !INCLUDE_JVMTI 2528 add_init_library(name, options); 2529 } 2530 } else if (match_option(option, "--add-reads=", &tail)) { 2531 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2532 return JNI_ENOMEM; 2533 } 2534 } else if (match_option(option, "--add-exports=", &tail)) { 2535 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2536 return JNI_ENOMEM; 2537 } 2538 } else if (match_option(option, "--add-opens=", &tail)) { 2539 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2540 return JNI_ENOMEM; 2541 } 2542 } else if (match_option(option, "--add-modules=", &tail)) { 2543 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2544 return JNI_ENOMEM; 2545 } 2546 } else if (match_option(option, "--limit-modules=", &tail)) { 2547 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2548 return JNI_ENOMEM; 2549 } 2550 } else if (match_option(option, "--module-path=", &tail)) { 2551 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2552 return JNI_ENOMEM; 2553 } 2554 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2555 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2556 return JNI_ENOMEM; 2557 } 2558 } else if (match_option(option, "--patch-module=", &tail)) { 2559 // --patch-module=<module>=<file>(<pathsep><file>)* 2560 int res = process_patch_mod_option(tail, patch_mod_javabase); 2561 if (res != JNI_OK) { 2562 return res; 2563 } 2564 } else if (match_option(option, "--illegal-access=", &tail)) { 2565 if (!create_property("jdk.module.illegalAccess", tail, ExternalProperty)) { 2566 return JNI_ENOMEM; 2567 } 2568 // -agentlib and -agentpath 2569 } else if (match_option(option, "-agentlib:", &tail) || 2570 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2571 if(tail != NULL) { 2572 const char* pos = strchr(tail, '='); 2573 char* name; 2574 if (pos == NULL) { 2575 name = os::strdup_check_oom(tail, mtArguments); 2576 } else { 2577 size_t len = pos - tail; 2578 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2579 memcpy(name, tail, len); 2580 name[len] = '\0'; 2581 } 2582 2583 char *options = NULL; 2584 if(pos != NULL) { 2585 options = os::strdup_check_oom(pos + 1, mtArguments); 2586 } 2587 #if !INCLUDE_JVMTI 2588 if (valid_jdwp_agent(name, is_absolute_path)) { 2589 jio_fprintf(defaultStream::error_stream(), 2590 "Debugging agents are not supported in this VM\n"); 2591 return JNI_ERR; 2592 } 2593 #endif // !INCLUDE_JVMTI 2594 add_init_agent(name, options, is_absolute_path); 2595 } 2596 // -javaagent 2597 } else if (match_option(option, "-javaagent:", &tail)) { 2598 #if !INCLUDE_JVMTI 2599 jio_fprintf(defaultStream::error_stream(), 2600 "Instrumentation agents are not supported in this VM\n"); 2601 return JNI_ERR; 2602 #else 2603 if (tail != NULL) { 2604 size_t length = strlen(tail) + 1; 2605 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2606 jio_snprintf(options, length, "%s", tail); 2607 add_instrument_agent("instrument", options, false); 2608 // java agents need module java.instrument 2609 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2610 return JNI_ENOMEM; 2611 } 2612 } 2613 #endif // !INCLUDE_JVMTI 2614 // --enable_preview 2615 } else if (match_option(option, "--enable-preview")) { 2616 set_enable_preview(); 2617 // -Xnoclassgc 2618 } else if (match_option(option, "-Xnoclassgc")) { 2619 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2620 return JNI_EINVAL; 2621 } 2622 // -Xconcgc 2623 } else if (match_option(option, "-Xconcgc")) { 2624 warning("-Xconcgc uses UseConcMarkSweepGC; support was removed for both options in 14.0"); 2625 // -Xnoconcgc 2626 } else if (match_option(option, "-Xnoconcgc")) { 2627 warning("-Xnoconcgc uses UseConcMarkSweepGC; support was removed for both options in 14.0"); 2628 // -Xbatch 2629 } else if (match_option(option, "-Xbatch")) { 2630 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2631 return JNI_EINVAL; 2632 } 2633 // -Xmn for compatibility with other JVM vendors 2634 } else if (match_option(option, "-Xmn", &tail)) { 2635 julong long_initial_young_size = 0; 2636 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2637 if (errcode != arg_in_range) { 2638 jio_fprintf(defaultStream::error_stream(), 2639 "Invalid initial young generation size: %s\n", option->optionString); 2640 describe_range_error(errcode); 2641 return JNI_EINVAL; 2642 } 2643 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2644 return JNI_EINVAL; 2645 } 2646 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2647 return JNI_EINVAL; 2648 } 2649 // -Xms 2650 } else if (match_option(option, "-Xms", &tail)) { 2651 julong size = 0; 2652 // an initial heap size of 0 means automatically determine 2653 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2654 if (errcode != arg_in_range) { 2655 jio_fprintf(defaultStream::error_stream(), 2656 "Invalid initial heap size: %s\n", option->optionString); 2657 describe_range_error(errcode); 2658 return JNI_EINVAL; 2659 } 2660 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2661 return JNI_EINVAL; 2662 } 2663 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2664 return JNI_EINVAL; 2665 } 2666 // -Xmx 2667 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2668 julong long_max_heap_size = 0; 2669 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2670 if (errcode != arg_in_range) { 2671 jio_fprintf(defaultStream::error_stream(), 2672 "Invalid maximum heap size: %s\n", option->optionString); 2673 describe_range_error(errcode); 2674 return JNI_EINVAL; 2675 } 2676 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2677 return JNI_EINVAL; 2678 } 2679 // Xmaxf 2680 } else if (match_option(option, "-Xmaxf", &tail)) { 2681 char* err; 2682 int maxf = (int)(strtod(tail, &err) * 100); 2683 if (*err != '\0' || *tail == '\0') { 2684 jio_fprintf(defaultStream::error_stream(), 2685 "Bad max heap free percentage size: %s\n", 2686 option->optionString); 2687 return JNI_EINVAL; 2688 } else { 2689 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2690 return JNI_EINVAL; 2691 } 2692 } 2693 // Xminf 2694 } else if (match_option(option, "-Xminf", &tail)) { 2695 char* err; 2696 int minf = (int)(strtod(tail, &err) * 100); 2697 if (*err != '\0' || *tail == '\0') { 2698 jio_fprintf(defaultStream::error_stream(), 2699 "Bad min heap free percentage size: %s\n", 2700 option->optionString); 2701 return JNI_EINVAL; 2702 } else { 2703 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2704 return JNI_EINVAL; 2705 } 2706 } 2707 // -Xss 2708 } else if (match_option(option, "-Xss", &tail)) { 2709 intx value = 0; 2710 jint err = parse_xss(option, tail, &value); 2711 if (err != JNI_OK) { 2712 return err; 2713 } 2714 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2715 return JNI_EINVAL; 2716 } 2717 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2718 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2719 julong long_ReservedCodeCacheSize = 0; 2720 2721 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2722 if (errcode != arg_in_range) { 2723 jio_fprintf(defaultStream::error_stream(), 2724 "Invalid maximum code cache size: %s.\n", option->optionString); 2725 return JNI_EINVAL; 2726 } 2727 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2728 return JNI_EINVAL; 2729 } 2730 // -green 2731 } else if (match_option(option, "-green")) { 2732 jio_fprintf(defaultStream::error_stream(), 2733 "Green threads support not available\n"); 2734 return JNI_EINVAL; 2735 // -native 2736 } else if (match_option(option, "-native")) { 2737 // HotSpot always uses native threads, ignore silently for compatibility 2738 // -Xrs 2739 } else if (match_option(option, "-Xrs")) { 2740 // Classic/EVM option, new functionality 2741 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2742 return JNI_EINVAL; 2743 } 2744 // -Xprof 2745 } else if (match_option(option, "-Xprof")) { 2746 char version[256]; 2747 // Obsolete in JDK 10 2748 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2749 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2750 // -Xinternalversion 2751 } else if (match_option(option, "-Xinternalversion")) { 2752 jio_fprintf(defaultStream::output_stream(), "%s\n", 2753 VM_Version::internal_vm_info_string()); 2754 vm_exit(0); 2755 #ifndef PRODUCT 2756 // -Xprintflags 2757 } else if (match_option(option, "-Xprintflags")) { 2758 JVMFlag::printFlags(tty, false); 2759 vm_exit(0); 2760 #endif 2761 // -D 2762 } else if (match_option(option, "-D", &tail)) { 2763 const char* value; 2764 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2765 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2766 // abort if -Djava.endorsed.dirs is set 2767 jio_fprintf(defaultStream::output_stream(), 2768 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2769 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2770 return JNI_EINVAL; 2771 } 2772 if (match_option(option, "-Djava.ext.dirs=", &value) && 2773 *value != '\0' && strcmp(value, "\"\"") != 0) { 2774 // abort if -Djava.ext.dirs is set 2775 jio_fprintf(defaultStream::output_stream(), 2776 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2777 return JNI_EINVAL; 2778 } 2779 // Check for module related properties. They must be set using the modules 2780 // options. For example: use "--add-modules=java.sql", not 2781 // "-Djdk.module.addmods=java.sql" 2782 if (is_internal_module_property(option->optionString + 2)) { 2783 needs_module_property_warning = true; 2784 continue; 2785 } 2786 if (!add_property(tail)) { 2787 return JNI_ENOMEM; 2788 } 2789 // Out of the box management support 2790 if (match_option(option, "-Dcom.sun.management", &tail)) { 2791 #if INCLUDE_MANAGEMENT 2792 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2793 return JNI_EINVAL; 2794 } 2795 // management agent in module jdk.management.agent 2796 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2797 return JNI_ENOMEM; 2798 } 2799 #else 2800 jio_fprintf(defaultStream::output_stream(), 2801 "-Dcom.sun.management is not supported in this VM.\n"); 2802 return JNI_ERR; 2803 #endif 2804 } 2805 // -Xint 2806 } else if (match_option(option, "-Xint")) { 2807 set_mode_flags(_int); 2808 // -Xmixed 2809 } else if (match_option(option, "-Xmixed")) { 2810 set_mode_flags(_mixed); 2811 // -Xcomp 2812 } else if (match_option(option, "-Xcomp")) { 2813 // for testing the compiler; turn off all flags that inhibit compilation 2814 set_mode_flags(_comp); 2815 // -Xshare:dump 2816 } else if (match_option(option, "-Xshare:dump")) { 2817 if (FLAG_SET_CMDLINE(DumpSharedSpaces, true) != JVMFlag::SUCCESS) { 2818 return JNI_EINVAL; 2819 } 2820 // -Xshare:on 2821 } else if (match_option(option, "-Xshare:on")) { 2822 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2823 return JNI_EINVAL; 2824 } 2825 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 2826 return JNI_EINVAL; 2827 } 2828 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2829 } else if (match_option(option, "-Xshare:auto")) { 2830 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 2831 return JNI_EINVAL; 2832 } 2833 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2834 return JNI_EINVAL; 2835 } 2836 // -Xshare:off 2837 } else if (match_option(option, "-Xshare:off")) { 2838 if (FLAG_SET_CMDLINE(UseSharedSpaces, false) != JVMFlag::SUCCESS) { 2839 return JNI_EINVAL; 2840 } 2841 if (FLAG_SET_CMDLINE(RequireSharedSpaces, false) != JVMFlag::SUCCESS) { 2842 return JNI_EINVAL; 2843 } 2844 // -Xverify 2845 } else if (match_option(option, "-Xverify", &tail)) { 2846 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2847 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2848 return JNI_EINVAL; 2849 } 2850 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2851 return JNI_EINVAL; 2852 } 2853 } else if (strcmp(tail, ":remote") == 0) { 2854 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2855 return JNI_EINVAL; 2856 } 2857 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2858 return JNI_EINVAL; 2859 } 2860 } else if (strcmp(tail, ":none") == 0) { 2861 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2862 return JNI_EINVAL; 2863 } 2864 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2865 return JNI_EINVAL; 2866 } 2867 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2868 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2869 return JNI_EINVAL; 2870 } 2871 // -Xdebug 2872 } else if (match_option(option, "-Xdebug")) { 2873 // note this flag has been used, then ignore 2874 set_xdebug_mode(true); 2875 // -Xnoagent 2876 } else if (match_option(option, "-Xnoagent")) { 2877 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 2878 } else if (match_option(option, "-Xloggc:", &tail)) { 2879 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2880 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2881 _gc_log_filename = os::strdup_check_oom(tail); 2882 } else if (match_option(option, "-Xlog", &tail)) { 2883 bool ret = false; 2884 if (strcmp(tail, ":help") == 0) { 2885 fileStream stream(defaultStream::output_stream()); 2886 LogConfiguration::print_command_line_help(&stream); 2887 vm_exit(0); 2888 } else if (strcmp(tail, ":disable") == 0) { 2889 LogConfiguration::disable_logging(); 2890 ret = true; 2891 } else if (*tail == '\0') { 2892 ret = LogConfiguration::parse_command_line_arguments(); 2893 assert(ret, "-Xlog without arguments should never fail to parse"); 2894 } else if (*tail == ':') { 2895 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2896 } 2897 if (ret == false) { 2898 jio_fprintf(defaultStream::error_stream(), 2899 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2900 tail); 2901 return JNI_EINVAL; 2902 } 2903 // JNI hooks 2904 } else if (match_option(option, "-Xcheck", &tail)) { 2905 if (!strcmp(tail, ":jni")) { 2906 #if !INCLUDE_JNI_CHECK 2907 warning("JNI CHECKING is not supported in this VM"); 2908 #else 2909 CheckJNICalls = true; 2910 #endif // INCLUDE_JNI_CHECK 2911 } else if (is_bad_option(option, args->ignoreUnrecognized, 2912 "check")) { 2913 return JNI_EINVAL; 2914 } 2915 } else if (match_option(option, "vfprintf")) { 2916 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2917 } else if (match_option(option, "exit")) { 2918 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2919 } else if (match_option(option, "abort")) { 2920 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2921 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2922 // and the last option wins. 2923 } else if (match_option(option, "-XX:+NeverTenure")) { 2924 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2925 return JNI_EINVAL; 2926 } 2927 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2928 return JNI_EINVAL; 2929 } 2930 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2931 return JNI_EINVAL; 2932 } 2933 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2934 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2935 return JNI_EINVAL; 2936 } 2937 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2938 return JNI_EINVAL; 2939 } 2940 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2941 return JNI_EINVAL; 2942 } 2943 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2944 uintx max_tenuring_thresh = 0; 2945 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 2946 jio_fprintf(defaultStream::error_stream(), 2947 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2948 return JNI_EINVAL; 2949 } 2950 2951 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2952 return JNI_EINVAL; 2953 } 2954 2955 if (MaxTenuringThreshold == 0) { 2956 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2957 return JNI_EINVAL; 2958 } 2959 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2960 return JNI_EINVAL; 2961 } 2962 } else { 2963 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2964 return JNI_EINVAL; 2965 } 2966 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2967 return JNI_EINVAL; 2968 } 2969 } 2970 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2971 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2972 return JNI_EINVAL; 2973 } 2974 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2975 return JNI_EINVAL; 2976 } 2977 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2978 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2979 return JNI_EINVAL; 2980 } 2981 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2982 return JNI_EINVAL; 2983 } 2984 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2985 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2986 return JNI_EINVAL; 2987 } 2988 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2989 return JNI_EINVAL; 2990 } 2991 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2992 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2993 return JNI_EINVAL; 2994 } 2995 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2996 return JNI_EINVAL; 2997 } 2998 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 2999 #if defined(DTRACE_ENABLED) 3000 if (FLAG_SET_CMDLINE(ExtendedDTraceProbes, true) != JVMFlag::SUCCESS) { 3001 return JNI_EINVAL; 3002 } 3003 if (FLAG_SET_CMDLINE(DTraceMethodProbes, true) != JVMFlag::SUCCESS) { 3004 return JNI_EINVAL; 3005 } 3006 if (FLAG_SET_CMDLINE(DTraceAllocProbes, true) != JVMFlag::SUCCESS) { 3007 return JNI_EINVAL; 3008 } 3009 if (FLAG_SET_CMDLINE(DTraceMonitorProbes, true) != JVMFlag::SUCCESS) { 3010 return JNI_EINVAL; 3011 } 3012 #else // defined(DTRACE_ENABLED) 3013 jio_fprintf(defaultStream::error_stream(), 3014 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3015 return JNI_EINVAL; 3016 #endif // defined(DTRACE_ENABLED) 3017 #ifdef ASSERT 3018 } else if (match_option(option, "-XX:+FullGCALot")) { 3019 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 3020 return JNI_EINVAL; 3021 } 3022 // disable scavenge before parallel mark-compact 3023 if (FLAG_SET_CMDLINE(ScavengeBeforeFullGC, false) != JVMFlag::SUCCESS) { 3024 return JNI_EINVAL; 3025 } 3026 #endif 3027 #if !INCLUDE_MANAGEMENT 3028 } else if (match_option(option, "-XX:+ManagementServer")) { 3029 jio_fprintf(defaultStream::error_stream(), 3030 "ManagementServer is not supported in this VM.\n"); 3031 return JNI_ERR; 3032 #endif // INCLUDE_MANAGEMENT 3033 #if INCLUDE_JVMCI 3034 } else if (match_option(option, "-XX:+EnableJVMCIProduct")) { 3035 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 3036 // Allow this flag if it has been unlocked. 3037 if (jvmciFlag != NULL && jvmciFlag->is_unlocked()) { 3038 if (!JVMCIGlobals::enable_jvmci_product_mode(origin)) { 3039 jio_fprintf(defaultStream::error_stream(), 3040 "Unable to enable JVMCI in product mode"); 3041 return JNI_ERR; 3042 } 3043 } 3044 // The flag was locked so process normally to report that error 3045 else if (!process_argument("EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 3046 return JNI_EINVAL; 3047 } 3048 #endif // INCLUDE_JVMCI 3049 #if INCLUDE_JFR 3050 } else if (match_jfr_option(&option)) { 3051 return JNI_EINVAL; 3052 #endif 3053 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3054 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3055 // already been handled 3056 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3057 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3058 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3059 return JNI_EINVAL; 3060 } 3061 } 3062 // Unknown option 3063 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3064 return JNI_ERR; 3065 } 3066 } 3067 3068 // PrintSharedArchiveAndExit will turn on 3069 // -Xshare:on 3070 // -Xlog:class+path=info 3071 if (PrintSharedArchiveAndExit) { 3072 if (FLAG_SET_CMDLINE(UseSharedSpaces, true) != JVMFlag::SUCCESS) { 3073 return JNI_EINVAL; 3074 } 3075 if (FLAG_SET_CMDLINE(RequireSharedSpaces, true) != JVMFlag::SUCCESS) { 3076 return JNI_EINVAL; 3077 } 3078 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3079 } 3080 3081 fix_appclasspath(); 3082 3083 return JNI_OK; 3084 } 3085 3086 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3087 // For java.base check for duplicate --patch-module options being specified on the command line. 3088 // This check is only required for java.base, all other duplicate module specifications 3089 // will be checked during module system initialization. The module system initialization 3090 // will throw an ExceptionInInitializerError if this situation occurs. 3091 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3092 if (*patch_mod_javabase) { 3093 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3094 } else { 3095 *patch_mod_javabase = true; 3096 } 3097 } 3098 3099 // Create GrowableArray lazily, only if --patch-module has been specified 3100 if (_patch_mod_prefix == NULL) { 3101 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3102 } 3103 3104 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3105 } 3106 3107 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3108 // 3109 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3110 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3111 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3112 // path is treated as the current directory. 3113 // 3114 // This causes problems with CDS, which requires that all directories specified in the classpath 3115 // must be empty. In most cases, applications do NOT want to load classes from the current 3116 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3117 // scripts compatible with CDS. 3118 void Arguments::fix_appclasspath() { 3119 if (IgnoreEmptyClassPaths) { 3120 const char separator = *os::path_separator(); 3121 const char* src = _java_class_path->value(); 3122 3123 // skip over all the leading empty paths 3124 while (*src == separator) { 3125 src ++; 3126 } 3127 3128 char* copy = os::strdup_check_oom(src, mtArguments); 3129 3130 // trim all trailing empty paths 3131 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3132 *tail = '\0'; 3133 } 3134 3135 char from[3] = {separator, separator, '\0'}; 3136 char to [2] = {separator, '\0'}; 3137 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3138 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3139 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3140 } 3141 3142 _java_class_path->set_writeable_value(copy); 3143 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3144 } 3145 } 3146 3147 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 3148 // check if the default lib/endorsed directory exists; if so, error 3149 char path[JVM_MAXPATHLEN]; 3150 const char* fileSep = os::file_separator(); 3151 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3152 3153 DIR* dir = os::opendir(path); 3154 if (dir != NULL) { 3155 jio_fprintf(defaultStream::output_stream(), 3156 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3157 "in modular form will be supported via the concept of upgradeable modules.\n"); 3158 os::closedir(dir); 3159 return JNI_ERR; 3160 } 3161 3162 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3163 dir = os::opendir(path); 3164 if (dir != NULL) { 3165 jio_fprintf(defaultStream::output_stream(), 3166 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3167 "Use -classpath instead.\n."); 3168 os::closedir(dir); 3169 return JNI_ERR; 3170 } 3171 3172 // This must be done after all arguments have been processed 3173 // and the container support has been initialized since AggressiveHeap 3174 // relies on the amount of total memory available. 3175 if (AggressiveHeap) { 3176 jint result = set_aggressive_heap_flags(); 3177 if (result != JNI_OK) { 3178 return result; 3179 } 3180 } 3181 3182 // This must be done after all arguments have been processed. 3183 // java_compiler() true means set to "NONE" or empty. 3184 if (java_compiler() && !xdebug_mode()) { 3185 // For backwards compatibility, we switch to interpreted mode if 3186 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3187 // not specified. 3188 set_mode_flags(_int); 3189 } 3190 3191 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3192 // but like -Xint, leave compilation thresholds unaffected. 3193 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3194 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3195 set_mode_flags(_int); 3196 } 3197 3198 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3199 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3200 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3201 } 3202 3203 #if !COMPILER2_OR_JVMCI 3204 // Don't degrade server performance for footprint 3205 if (FLAG_IS_DEFAULT(UseLargePages) && 3206 MaxHeapSize < LargePageHeapSizeThreshold) { 3207 // No need for large granularity pages w/small heaps. 3208 // Note that large pages are enabled/disabled for both the 3209 // Java heap and the code cache. 3210 FLAG_SET_DEFAULT(UseLargePages, false); 3211 } 3212 3213 UNSUPPORTED_OPTION(ProfileInterpreter); 3214 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3215 #endif 3216 3217 3218 #ifdef TIERED 3219 // Parse the CompilationMode flag 3220 if (!CompilationModeFlag::initialize()) { 3221 return JNI_ERR; 3222 } 3223 #else 3224 // Tiered compilation is undefined. 3225 UNSUPPORTED_OPTION(TieredCompilation); 3226 #endif 3227 3228 if (!check_vm_args_consistency()) { 3229 return JNI_ERR; 3230 } 3231 3232 #if INCLUDE_CDS 3233 if (DumpSharedSpaces) { 3234 // Disable biased locking now as it interferes with the clean up of 3235 // the archived Klasses and Java string objects (at dump time only). 3236 UseBiasedLocking = false; 3237 3238 // Compiler threads may concurrently update the class metadata (such as method entries), so it's 3239 // unsafe with DumpSharedSpaces (which modifies the class metadata in place). Let's disable 3240 // compiler just to be safe. 3241 // 3242 // Note: this is not a concern for DynamicDumpSharedSpaces, which makes a copy of the class metadata 3243 // instead of modifying them in place. The copy is inaccessible to the compiler. 3244 // TODO: revisit the following for the static archive case. 3245 set_mode_flags(_int); 3246 } 3247 if (DumpSharedSpaces || ArchiveClassesAtExit != NULL) { 3248 // Always verify non-system classes during CDS dump 3249 if (!BytecodeVerificationRemote) { 3250 BytecodeVerificationRemote = true; 3251 log_info(cds)("All non-system classes will be verified (-Xverify:remote) during CDS dump time."); 3252 } 3253 } 3254 if (ArchiveClassesAtExit == NULL) { 3255 FLAG_SET_DEFAULT(DynamicDumpSharedSpaces, false); 3256 } 3257 if (UseSharedSpaces && patch_mod_javabase) { 3258 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 3259 } 3260 if (UseSharedSpaces && !DumpSharedSpaces && check_unsupported_cds_runtime_properties()) { 3261 FLAG_SET_DEFAULT(UseSharedSpaces, false); 3262 } 3263 #endif 3264 3265 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3266 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3267 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3268 3269 return JNI_OK; 3270 } 3271 3272 // Helper class for controlling the lifetime of JavaVMInitArgs 3273 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3274 // deleted on the destruction of the ScopedVMInitArgs object. 3275 class ScopedVMInitArgs : public StackObj { 3276 private: 3277 JavaVMInitArgs _args; 3278 char* _container_name; 3279 bool _is_set; 3280 char* _vm_options_file_arg; 3281 3282 public: 3283 ScopedVMInitArgs(const char *container_name) { 3284 _args.version = JNI_VERSION_1_2; 3285 _args.nOptions = 0; 3286 _args.options = NULL; 3287 _args.ignoreUnrecognized = false; 3288 _container_name = (char *)container_name; 3289 _is_set = false; 3290 _vm_options_file_arg = NULL; 3291 } 3292 3293 // Populates the JavaVMInitArgs object represented by this 3294 // ScopedVMInitArgs object with the arguments in options. The 3295 // allocated memory is deleted by the destructor. If this method 3296 // returns anything other than JNI_OK, then this object is in a 3297 // partially constructed state, and should be abandoned. 3298 jint set_args(GrowableArray<JavaVMOption>* options) { 3299 _is_set = true; 3300 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3301 JavaVMOption, options->length(), mtArguments); 3302 if (options_arr == NULL) { 3303 return JNI_ENOMEM; 3304 } 3305 _args.options = options_arr; 3306 3307 for (int i = 0; i < options->length(); i++) { 3308 options_arr[i] = options->at(i); 3309 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3310 if (options_arr[i].optionString == NULL) { 3311 // Rely on the destructor to do cleanup. 3312 _args.nOptions = i; 3313 return JNI_ENOMEM; 3314 } 3315 } 3316 3317 _args.nOptions = options->length(); 3318 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3319 return JNI_OK; 3320 } 3321 3322 JavaVMInitArgs* get() { return &_args; } 3323 char* container_name() { return _container_name; } 3324 bool is_set() { return _is_set; } 3325 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3326 char* vm_options_file_arg() { return _vm_options_file_arg; } 3327 3328 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3329 if (_vm_options_file_arg != NULL) { 3330 os::free(_vm_options_file_arg); 3331 } 3332 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3333 } 3334 3335 ~ScopedVMInitArgs() { 3336 if (_vm_options_file_arg != NULL) { 3337 os::free(_vm_options_file_arg); 3338 } 3339 if (_args.options == NULL) return; 3340 for (int i = 0; i < _args.nOptions; i++) { 3341 os::free(_args.options[i].optionString); 3342 } 3343 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3344 } 3345 3346 // Insert options into this option list, to replace option at 3347 // vm_options_file_pos (-XX:VMOptionsFile) 3348 jint insert(const JavaVMInitArgs* args, 3349 const JavaVMInitArgs* args_to_insert, 3350 const int vm_options_file_pos) { 3351 assert(_args.options == NULL, "shouldn't be set yet"); 3352 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3353 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3354 3355 int length = args->nOptions + args_to_insert->nOptions - 1; 3356 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3357 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3358 for (int i = 0; i < args->nOptions; i++) { 3359 if (i == vm_options_file_pos) { 3360 // insert the new options starting at the same place as the 3361 // -XX:VMOptionsFile option 3362 for (int j = 0; j < args_to_insert->nOptions; j++) { 3363 options->push(args_to_insert->options[j]); 3364 } 3365 } else { 3366 options->push(args->options[i]); 3367 } 3368 } 3369 // make into options array 3370 jint result = set_args(options); 3371 delete options; 3372 return result; 3373 } 3374 }; 3375 3376 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3377 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3378 } 3379 3380 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3381 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3382 } 3383 3384 jint Arguments::parse_options_environment_variable(const char* name, 3385 ScopedVMInitArgs* vm_args) { 3386 char *buffer = ::getenv(name); 3387 3388 // Don't check this environment variable if user has special privileges 3389 // (e.g. unix su command). 3390 if (buffer == NULL || os::have_special_privileges()) { 3391 return JNI_OK; 3392 } 3393 3394 if ((buffer = os::strdup(buffer)) == NULL) { 3395 return JNI_ENOMEM; 3396 } 3397 3398 jio_fprintf(defaultStream::error_stream(), 3399 "Picked up %s: %s\n", name, buffer); 3400 3401 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3402 3403 os::free(buffer); 3404 return retcode; 3405 } 3406 3407 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3408 // read file into buffer 3409 int fd = ::open(file_name, O_RDONLY); 3410 if (fd < 0) { 3411 jio_fprintf(defaultStream::error_stream(), 3412 "Could not open options file '%s'\n", 3413 file_name); 3414 return JNI_ERR; 3415 } 3416 3417 struct stat stbuf; 3418 int retcode = os::stat(file_name, &stbuf); 3419 if (retcode != 0) { 3420 jio_fprintf(defaultStream::error_stream(), 3421 "Could not stat options file '%s'\n", 3422 file_name); 3423 os::close(fd); 3424 return JNI_ERR; 3425 } 3426 3427 if (stbuf.st_size == 0) { 3428 // tell caller there is no option data and that is ok 3429 os::close(fd); 3430 return JNI_OK; 3431 } 3432 3433 // '+ 1' for NULL termination even with max bytes 3434 size_t bytes_alloc = stbuf.st_size + 1; 3435 3436 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3437 if (NULL == buf) { 3438 jio_fprintf(defaultStream::error_stream(), 3439 "Could not allocate read buffer for options file parse\n"); 3440 os::close(fd); 3441 return JNI_ENOMEM; 3442 } 3443 3444 memset(buf, 0, bytes_alloc); 3445 3446 // Fill buffer 3447 ssize_t bytes_read = os::read(fd, (void *)buf, (unsigned)bytes_alloc); 3448 os::close(fd); 3449 if (bytes_read < 0) { 3450 FREE_C_HEAP_ARRAY(char, buf); 3451 jio_fprintf(defaultStream::error_stream(), 3452 "Could not read options file '%s'\n", file_name); 3453 return JNI_ERR; 3454 } 3455 3456 if (bytes_read == 0) { 3457 // tell caller there is no option data and that is ok 3458 FREE_C_HEAP_ARRAY(char, buf); 3459 return JNI_OK; 3460 } 3461 3462 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3463 3464 FREE_C_HEAP_ARRAY(char, buf); 3465 return retcode; 3466 } 3467 3468 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3469 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3470 3471 // some pointers to help with parsing 3472 char *buffer_end = buffer + buf_len; 3473 char *opt_hd = buffer; 3474 char *wrt = buffer; 3475 char *rd = buffer; 3476 3477 // parse all options 3478 while (rd < buffer_end) { 3479 // skip leading white space from the input string 3480 while (rd < buffer_end && isspace(*rd)) { 3481 rd++; 3482 } 3483 3484 if (rd >= buffer_end) { 3485 break; 3486 } 3487 3488 // Remember this is where we found the head of the token. 3489 opt_hd = wrt; 3490 3491 // Tokens are strings of non white space characters separated 3492 // by one or more white spaces. 3493 while (rd < buffer_end && !isspace(*rd)) { 3494 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3495 int quote = *rd; // matching quote to look for 3496 rd++; // don't copy open quote 3497 while (rd < buffer_end && *rd != quote) { 3498 // include everything (even spaces) 3499 // up until the close quote 3500 *wrt++ = *rd++; // copy to option string 3501 } 3502 3503 if (rd < buffer_end) { 3504 rd++; // don't copy close quote 3505 } else { 3506 // did not see closing quote 3507 jio_fprintf(defaultStream::error_stream(), 3508 "Unmatched quote in %s\n", name); 3509 delete options; 3510 return JNI_ERR; 3511 } 3512 } else { 3513 *wrt++ = *rd++; // copy to option string 3514 } 3515 } 3516 3517 // steal a white space character and set it to NULL 3518 *wrt++ = '\0'; 3519 // We now have a complete token 3520 3521 JavaVMOption option; 3522 option.optionString = opt_hd; 3523 option.extraInfo = NULL; 3524 3525 options->append(option); // Fill in option 3526 3527 rd++; // Advance to next character 3528 } 3529 3530 // Fill out JavaVMInitArgs structure. 3531 jint status = vm_args->set_args(options); 3532 3533 delete options; 3534 return status; 3535 } 3536 3537 void Arguments::set_shared_spaces_flags() { 3538 if (DumpSharedSpaces) { 3539 if (RequireSharedSpaces) { 3540 warning("Cannot dump shared archive while using shared archive"); 3541 } 3542 UseSharedSpaces = false; 3543 #ifdef _LP64 3544 if (!UseCompressedOops || !UseCompressedClassPointers) { 3545 vm_exit_during_initialization( 3546 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3547 } 3548 } else { 3549 if (!UseCompressedOops || !UseCompressedClassPointers) { 3550 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3551 } 3552 #endif 3553 } 3554 } 3555 3556 #if INCLUDE_CDS 3557 // Sharing support 3558 // Construct the path to the archive 3559 char* Arguments::get_default_shared_archive_path() { 3560 char *default_archive_path; 3561 char jvm_path[JVM_MAXPATHLEN]; 3562 os::jvm_path(jvm_path, sizeof(jvm_path)); 3563 char *end = strrchr(jvm_path, *os::file_separator()); 3564 if (end != NULL) *end = '\0'; 3565 size_t jvm_path_len = strlen(jvm_path); 3566 size_t file_sep_len = strlen(os::file_separator()); 3567 const size_t len = jvm_path_len + file_sep_len + 20; 3568 default_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3569 jio_snprintf(default_archive_path, len, "%s%sclasses.jsa", 3570 jvm_path, os::file_separator()); 3571 return default_archive_path; 3572 } 3573 3574 int Arguments::num_archives(const char* archive_path) { 3575 if (archive_path == NULL) { 3576 return 0; 3577 } 3578 int npaths = 1; 3579 char* p = (char*)archive_path; 3580 while (*p != '\0') { 3581 if (*p == os::path_separator()[0]) { 3582 npaths++; 3583 } 3584 p++; 3585 } 3586 return npaths; 3587 } 3588 3589 void Arguments::extract_shared_archive_paths(const char* archive_path, 3590 char** base_archive_path, 3591 char** top_archive_path) { 3592 char* begin_ptr = (char*)archive_path; 3593 char* end_ptr = strchr((char*)archive_path, os::path_separator()[0]); 3594 if (end_ptr == NULL || end_ptr == begin_ptr) { 3595 vm_exit_during_initialization("Base archive was not specified", archive_path); 3596 } 3597 size_t len = end_ptr - begin_ptr; 3598 char* cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3599 strncpy(cur_path, begin_ptr, len); 3600 cur_path[len] = '\0'; 3601 FileMapInfo::check_archive((const char*)cur_path, true /*is_static*/); 3602 *base_archive_path = cur_path; 3603 3604 begin_ptr = ++end_ptr; 3605 if (*begin_ptr == '\0') { 3606 vm_exit_during_initialization("Top archive was not specified", archive_path); 3607 } 3608 end_ptr = strchr(begin_ptr, '\0'); 3609 assert(end_ptr != NULL, "sanity"); 3610 len = end_ptr - begin_ptr; 3611 cur_path = NEW_C_HEAP_ARRAY(char, len + 1, mtInternal); 3612 strncpy(cur_path, begin_ptr, len + 1); 3613 //cur_path[len] = '\0'; 3614 FileMapInfo::check_archive((const char*)cur_path, false /*is_static*/); 3615 *top_archive_path = cur_path; 3616 } 3617 3618 bool Arguments::init_shared_archive_paths() { 3619 if (ArchiveClassesAtExit != NULL) { 3620 if (DumpSharedSpaces) { 3621 vm_exit_during_initialization("-XX:ArchiveClassesAtExit cannot be used with -Xshare:dump"); 3622 } 3623 if (FLAG_SET_CMDLINE(DynamicDumpSharedSpaces, true) != JVMFlag::SUCCESS) { 3624 return false; 3625 } 3626 check_unsupported_dumping_properties(); 3627 SharedDynamicArchivePath = os::strdup_check_oom(ArchiveClassesAtExit, mtArguments); 3628 } 3629 if (SharedArchiveFile == NULL) { 3630 SharedArchivePath = get_default_shared_archive_path(); 3631 } else { 3632 int archives = num_archives(SharedArchiveFile); 3633 if (is_dumping_archive()) { 3634 if (archives > 1) { 3635 vm_exit_during_initialization( 3636 "Cannot have more than 1 archive file specified in -XX:SharedArchiveFile during CDS dumping"); 3637 } 3638 if (DynamicDumpSharedSpaces) { 3639 if (os::same_files(SharedArchiveFile, ArchiveClassesAtExit)) { 3640 vm_exit_during_initialization( 3641 "Cannot have the same archive file specified for -XX:SharedArchiveFile and -XX:ArchiveClassesAtExit", 3642 SharedArchiveFile); 3643 } 3644 } 3645 } 3646 if (!is_dumping_archive()){ 3647 if (archives > 2) { 3648 vm_exit_during_initialization( 3649 "Cannot have more than 2 archive files specified in the -XX:SharedArchiveFile option"); 3650 } 3651 if (archives == 1) { 3652 char* temp_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3653 int name_size; 3654 bool success = 3655 FileMapInfo::get_base_archive_name_from_header(temp_archive_path, &name_size, &SharedArchivePath); 3656 if (!success) { 3657 SharedArchivePath = temp_archive_path; 3658 } else { 3659 SharedDynamicArchivePath = temp_archive_path; 3660 } 3661 } else { 3662 extract_shared_archive_paths((const char*)SharedArchiveFile, 3663 &SharedArchivePath, &SharedDynamicArchivePath); 3664 } 3665 } else { // CDS dumping 3666 SharedArchivePath = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3667 } 3668 } 3669 return (SharedArchivePath != NULL); 3670 } 3671 #endif // INCLUDE_CDS 3672 3673 #ifndef PRODUCT 3674 // Determine whether LogVMOutput should be implicitly turned on. 3675 static bool use_vm_log() { 3676 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3677 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3678 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3679 PrintAssembly || TraceDeoptimization || TraceDependencies || 3680 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3681 return true; 3682 } 3683 3684 #ifdef COMPILER1 3685 if (PrintC1Statistics) { 3686 return true; 3687 } 3688 #endif // COMPILER1 3689 3690 #ifdef COMPILER2 3691 if (PrintOptoAssembly || PrintOptoStatistics) { 3692 return true; 3693 } 3694 #endif // COMPILER2 3695 3696 return false; 3697 } 3698 3699 #endif // PRODUCT 3700 3701 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3702 for (int index = 0; index < args->nOptions; index++) { 3703 const JavaVMOption* option = args->options + index; 3704 const char* tail; 3705 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3706 return true; 3707 } 3708 } 3709 return false; 3710 } 3711 3712 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3713 const char* vm_options_file, 3714 const int vm_options_file_pos, 3715 ScopedVMInitArgs* vm_options_file_args, 3716 ScopedVMInitArgs* args_out) { 3717 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3718 if (code != JNI_OK) { 3719 return code; 3720 } 3721 3722 if (vm_options_file_args->get()->nOptions < 1) { 3723 return JNI_OK; 3724 } 3725 3726 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3727 jio_fprintf(defaultStream::error_stream(), 3728 "A VM options file may not refer to a VM options file. " 3729 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3730 "options file '%s' in options container '%s' is an error.\n", 3731 vm_options_file_args->vm_options_file_arg(), 3732 vm_options_file_args->container_name()); 3733 return JNI_EINVAL; 3734 } 3735 3736 return args_out->insert(args, vm_options_file_args->get(), 3737 vm_options_file_pos); 3738 } 3739 3740 // Expand -XX:VMOptionsFile found in args_in as needed. 3741 // mod_args and args_out parameters may return values as needed. 3742 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3743 ScopedVMInitArgs* mod_args, 3744 JavaVMInitArgs** args_out) { 3745 jint code = match_special_option_and_act(args_in, mod_args); 3746 if (code != JNI_OK) { 3747 return code; 3748 } 3749 3750 if (mod_args->is_set()) { 3751 // args_in contains -XX:VMOptionsFile and mod_args contains the 3752 // original options from args_in along with the options expanded 3753 // from the VMOptionsFile. Return a short-hand to the caller. 3754 *args_out = mod_args->get(); 3755 } else { 3756 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3757 } 3758 return JNI_OK; 3759 } 3760 3761 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3762 ScopedVMInitArgs* args_out) { 3763 // Remaining part of option string 3764 const char* tail; 3765 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3766 3767 for (int index = 0; index < args->nOptions; index++) { 3768 const JavaVMOption* option = args->options + index; 3769 if (match_option(option, "-XX:Flags=", &tail)) { 3770 Arguments::set_jvm_flags_file(tail); 3771 continue; 3772 } 3773 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3774 if (vm_options_file_args.found_vm_options_file_arg()) { 3775 jio_fprintf(defaultStream::error_stream(), 3776 "The option '%s' is already specified in the options " 3777 "container '%s' so the specification of '%s' in the " 3778 "same options container is an error.\n", 3779 vm_options_file_args.vm_options_file_arg(), 3780 vm_options_file_args.container_name(), 3781 option->optionString); 3782 return JNI_EINVAL; 3783 } 3784 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3785 // If there's a VMOptionsFile, parse that 3786 jint code = insert_vm_options_file(args, tail, index, 3787 &vm_options_file_args, args_out); 3788 if (code != JNI_OK) { 3789 return code; 3790 } 3791 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3792 if (args_out->is_set()) { 3793 // The VMOptions file inserted some options so switch 'args' 3794 // to the new set of options, and continue processing which 3795 // preserves "last option wins" semantics. 3796 args = args_out->get(); 3797 // The first option from the VMOptionsFile replaces the 3798 // current option. So we back track to process the 3799 // replacement option. 3800 index--; 3801 } 3802 continue; 3803 } 3804 if (match_option(option, "-XX:+PrintVMOptions")) { 3805 PrintVMOptions = true; 3806 continue; 3807 } 3808 if (match_option(option, "-XX:-PrintVMOptions")) { 3809 PrintVMOptions = false; 3810 continue; 3811 } 3812 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3813 IgnoreUnrecognizedVMOptions = true; 3814 continue; 3815 } 3816 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3817 IgnoreUnrecognizedVMOptions = false; 3818 continue; 3819 } 3820 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3821 JVMFlag::printFlags(tty, false); 3822 vm_exit(0); 3823 } 3824 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 3825 #if INCLUDE_NMT 3826 // The launcher did not setup nmt environment variable properly. 3827 if (!MemTracker::check_launcher_nmt_support(tail)) { 3828 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 3829 } 3830 3831 // Verify if nmt option is valid. 3832 if (MemTracker::verify_nmt_option()) { 3833 // Late initialization, still in single-threaded mode. 3834 if (MemTracker::tracking_level() >= NMT_summary) { 3835 MemTracker::init(); 3836 } 3837 } else { 3838 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 3839 } 3840 continue; 3841 #else 3842 jio_fprintf(defaultStream::error_stream(), 3843 "Native Memory Tracking is not supported in this VM\n"); 3844 return JNI_ERR; 3845 #endif 3846 } 3847 3848 #ifndef PRODUCT 3849 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3850 JVMFlag::printFlags(tty, true); 3851 vm_exit(0); 3852 } 3853 #endif 3854 } 3855 return JNI_OK; 3856 } 3857 3858 static void print_options(const JavaVMInitArgs *args) { 3859 const char* tail; 3860 for (int index = 0; index < args->nOptions; index++) { 3861 const JavaVMOption *option = args->options + index; 3862 if (match_option(option, "-XX:", &tail)) { 3863 logOption(tail); 3864 } 3865 } 3866 } 3867 3868 bool Arguments::handle_deprecated_print_gc_flags() { 3869 if (PrintGC) { 3870 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3871 } 3872 if (PrintGCDetails) { 3873 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3874 } 3875 3876 if (_gc_log_filename != NULL) { 3877 // -Xloggc was used to specify a filename 3878 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3879 3880 LogTarget(Error, logging) target; 3881 LogStream errstream(target); 3882 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 3883 } else if (PrintGC || PrintGCDetails) { 3884 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3885 } 3886 return true; 3887 } 3888 3889 // Parse entry point called from JNI_CreateJavaVM 3890 3891 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3892 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 3893 3894 // Initialize ranges, constraints and writeables 3895 JVMFlagRangeList::init(); 3896 JVMFlagConstraintList::init(); 3897 JVMFlagWriteableList::init(); 3898 3899 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3900 const char* hotspotrc = ".hotspotrc"; 3901 bool settings_file_specified = false; 3902 bool needs_hotspotrc_warning = false; 3903 ScopedVMInitArgs initial_vm_options_args(""); 3904 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3905 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3906 3907 // Pointers to current working set of containers 3908 JavaVMInitArgs* cur_cmd_args; 3909 JavaVMInitArgs* cur_vm_options_args; 3910 JavaVMInitArgs* cur_java_options_args; 3911 JavaVMInitArgs* cur_java_tool_options_args; 3912 3913 // Containers for modified/expanded options 3914 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3915 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3916 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3917 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3918 3919 3920 jint code = 3921 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3922 if (code != JNI_OK) { 3923 return code; 3924 } 3925 3926 code = parse_java_options_environment_variable(&initial_java_options_args); 3927 if (code != JNI_OK) { 3928 return code; 3929 } 3930 3931 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3932 char *vmoptions = ClassLoader::lookup_vm_options(); 3933 if (vmoptions != NULL) { 3934 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3935 FREE_C_HEAP_ARRAY(char, vmoptions); 3936 if (code != JNI_OK) { 3937 return code; 3938 } 3939 } 3940 3941 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3942 &mod_java_tool_options_args, 3943 &cur_java_tool_options_args); 3944 if (code != JNI_OK) { 3945 return code; 3946 } 3947 3948 code = expand_vm_options_as_needed(initial_cmd_args, 3949 &mod_cmd_args, 3950 &cur_cmd_args); 3951 if (code != JNI_OK) { 3952 return code; 3953 } 3954 3955 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3956 &mod_java_options_args, 3957 &cur_java_options_args); 3958 if (code != JNI_OK) { 3959 return code; 3960 } 3961 3962 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3963 &mod_vm_options_args, 3964 &cur_vm_options_args); 3965 if (code != JNI_OK) { 3966 return code; 3967 } 3968 3969 const char* flags_file = Arguments::get_jvm_flags_file(); 3970 settings_file_specified = (flags_file != NULL); 3971 3972 if (IgnoreUnrecognizedVMOptions) { 3973 cur_cmd_args->ignoreUnrecognized = true; 3974 cur_java_tool_options_args->ignoreUnrecognized = true; 3975 cur_java_options_args->ignoreUnrecognized = true; 3976 } 3977 3978 // Parse specified settings file 3979 if (settings_file_specified) { 3980 if (!process_settings_file(flags_file, true, 3981 cur_cmd_args->ignoreUnrecognized)) { 3982 return JNI_EINVAL; 3983 } 3984 } else { 3985 #ifdef ASSERT 3986 // Parse default .hotspotrc settings file 3987 if (!process_settings_file(".hotspotrc", false, 3988 cur_cmd_args->ignoreUnrecognized)) { 3989 return JNI_EINVAL; 3990 } 3991 #else 3992 struct stat buf; 3993 if (os::stat(hotspotrc, &buf) == 0) { 3994 needs_hotspotrc_warning = true; 3995 } 3996 #endif 3997 } 3998 3999 if (PrintVMOptions) { 4000 print_options(cur_java_tool_options_args); 4001 print_options(cur_cmd_args); 4002 print_options(cur_java_options_args); 4003 } 4004 4005 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4006 jint result = parse_vm_init_args(cur_vm_options_args, 4007 cur_java_tool_options_args, 4008 cur_java_options_args, 4009 cur_cmd_args); 4010 4011 if (result != JNI_OK) { 4012 return result; 4013 } 4014 4015 #if INCLUDE_CDS 4016 // Initialize shared archive paths which could include both base and dynamic archive paths 4017 if (!init_shared_archive_paths()) { 4018 return JNI_ENOMEM; 4019 } 4020 #endif 4021 4022 // Delay warning until here so that we've had a chance to process 4023 // the -XX:-PrintWarnings flag 4024 if (needs_hotspotrc_warning) { 4025 warning("%s file is present but has been ignored. " 4026 "Run with -XX:Flags=%s to load the file.", 4027 hotspotrc, hotspotrc); 4028 } 4029 4030 if (needs_module_property_warning) { 4031 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4032 " names that are reserved for internal use."); 4033 } 4034 4035 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4036 UNSUPPORTED_OPTION(UseLargePages); 4037 #endif 4038 4039 #if defined(AIX) 4040 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 4041 UNSUPPORTED_OPTION_NULL(AllocateOldGenAt); 4042 #endif 4043 4044 #ifndef PRODUCT 4045 if (TraceBytecodesAt != 0) { 4046 TraceBytecodes = true; 4047 } 4048 if (CountCompiledCalls) { 4049 if (UseCounterDecay) { 4050 warning("UseCounterDecay disabled because CountCalls is set"); 4051 UseCounterDecay = false; 4052 } 4053 } 4054 #endif // PRODUCT 4055 4056 if (ScavengeRootsInCode == 0) { 4057 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4058 warning("Forcing ScavengeRootsInCode non-zero"); 4059 } 4060 ScavengeRootsInCode = 1; 4061 } 4062 4063 if (!handle_deprecated_print_gc_flags()) { 4064 return JNI_EINVAL; 4065 } 4066 4067 // Set object alignment values. 4068 set_object_alignment(); 4069 4070 #if !INCLUDE_CDS 4071 if (DumpSharedSpaces || RequireSharedSpaces) { 4072 jio_fprintf(defaultStream::error_stream(), 4073 "Shared spaces are not supported in this VM\n"); 4074 return JNI_ERR; 4075 } 4076 if (DumpLoadedClassList != NULL) { 4077 jio_fprintf(defaultStream::error_stream(), 4078 "DumpLoadedClassList is not supported in this VM\n"); 4079 return JNI_ERR; 4080 } 4081 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || 4082 log_is_enabled(Info, cds)) { 4083 warning("Shared spaces are not supported in this VM"); 4084 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4085 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 4086 } 4087 no_shared_spaces("CDS Disabled"); 4088 #endif // INCLUDE_CDS 4089 4090 #ifndef TIERED 4091 if (FLAG_IS_CMDLINE(CompilationMode)) { 4092 warning("CompilationMode has no effect in non-tiered VMs"); 4093 } 4094 #endif 4095 4096 return JNI_OK; 4097 } 4098 4099 jint Arguments::apply_ergo() { 4100 // Set flags based on ergonomics. 4101 jint result = set_ergonomics_flags(); 4102 if (result != JNI_OK) return result; 4103 4104 // Set heap size based on available physical memory 4105 set_heap_size(); 4106 4107 GCConfig::arguments()->initialize(); 4108 4109 set_shared_spaces_flags(); 4110 4111 // Initialize Metaspace flags and alignments 4112 Metaspace::ergo_initialize(); 4113 4114 // Set compiler flags after GC is selected and GC specific 4115 // flags (LoopStripMiningIter) are set. 4116 CompilerConfig::ergo_initialize(); 4117 4118 // Set bytecode rewriting flags 4119 set_bytecode_flags(); 4120 4121 // Set flags if aggressive optimization flags are enabled 4122 jint code = set_aggressive_opts_flags(); 4123 if (code != JNI_OK) { 4124 return code; 4125 } 4126 4127 // Turn off biased locking for locking debug mode flags, 4128 // which are subtly different from each other but neither works with 4129 // biased locking 4130 if (UseHeavyMonitors 4131 #ifdef COMPILER1 4132 || !UseFastLocking 4133 #endif // COMPILER1 4134 #if INCLUDE_JVMCI 4135 || !JVMCIUseFastLocking 4136 #endif 4137 ) { 4138 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4139 // flag set to true on command line; warn the user that they 4140 // can't enable biased locking here 4141 warning("Biased Locking is not supported with locking debug flags" 4142 "; ignoring UseBiasedLocking flag." ); 4143 } 4144 UseBiasedLocking = false; 4145 } 4146 4147 #ifdef CC_INTERP 4148 // Clear flags not supported on zero. 4149 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4150 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4151 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4152 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4153 #endif // CC_INTERP 4154 4155 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4156 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4157 DebugNonSafepoints = true; 4158 } 4159 4160 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4161 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4162 } 4163 4164 // Treat the odd case where local verification is enabled but remote 4165 // verification is not as if both were enabled. 4166 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 4167 log_info(verification)("Turning on remote verification because local verification is on"); 4168 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 4169 } 4170 4171 #ifndef PRODUCT 4172 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4173 if (use_vm_log()) { 4174 LogVMOutput = true; 4175 } 4176 } 4177 #endif // PRODUCT 4178 4179 if (PrintCommandLineFlags) { 4180 JVMFlag::printSetFlags(tty); 4181 } 4182 4183 // Apply CPU specific policy for the BiasedLocking 4184 if (UseBiasedLocking) { 4185 if (!VM_Version::use_biased_locking() && 4186 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4187 UseBiasedLocking = false; 4188 } 4189 } 4190 #ifdef COMPILER2 4191 if (!UseBiasedLocking) { 4192 UseOptoBiasInlining = false; 4193 } 4194 #endif 4195 4196 #if defined(IA32) 4197 // Only server compiler can optimize safepoints well enough. 4198 if (!is_server_compilation_mode_vm()) { 4199 FLAG_SET_ERGO_IF_DEFAULT(ThreadLocalHandshakes, false); 4200 } 4201 #endif 4202 4203 // ThreadLocalHandshakesConstraintFunc handles the constraints. 4204 if (FLAG_IS_DEFAULT(ThreadLocalHandshakes) || !SafepointMechanism::supports_thread_local_poll()) { 4205 log_debug(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4206 } else { 4207 log_info(ergo)("ThreadLocalHandshakes %s", ThreadLocalHandshakes ? "enabled." : "disabled."); 4208 } 4209 4210 return JNI_OK; 4211 } 4212 4213 jint Arguments::adjust_after_os() { 4214 if (UseNUMA) { 4215 if (!FLAG_IS_DEFAULT(AllocateHeapAt)) { 4216 FLAG_SET_ERGO(UseNUMA, false); 4217 } else if (UseParallelGC || UseParallelOldGC) { 4218 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4219 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4220 } 4221 } 4222 // UseNUMAInterleaving is set to ON for all collectors and platforms when 4223 // UseNUMA is set to ON. NUMA-aware collectors will interleave old gen and 4224 // survivor spaces on top of NUMA allocation policy for the eden space. 4225 // Non NUMA-aware collectors will interleave all of the heap spaces across 4226 // NUMA nodes. 4227 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4228 FLAG_SET_ERGO(UseNUMAInterleaving, true); 4229 } 4230 } 4231 return JNI_OK; 4232 } 4233 4234 int Arguments::PropertyList_count(SystemProperty* pl) { 4235 int count = 0; 4236 while(pl != NULL) { 4237 count++; 4238 pl = pl->next(); 4239 } 4240 return count; 4241 } 4242 4243 // Return the number of readable properties. 4244 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4245 int count = 0; 4246 while(pl != NULL) { 4247 if (pl->is_readable()) { 4248 count++; 4249 } 4250 pl = pl->next(); 4251 } 4252 return count; 4253 } 4254 4255 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4256 assert(key != NULL, "just checking"); 4257 SystemProperty* prop; 4258 for (prop = pl; prop != NULL; prop = prop->next()) { 4259 if (strcmp(key, prop->key()) == 0) return prop->value(); 4260 } 4261 return NULL; 4262 } 4263 4264 // Return the value of the requested property provided that it is a readable property. 4265 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4266 assert(key != NULL, "just checking"); 4267 SystemProperty* prop; 4268 // Return the property value if the keys match and the property is not internal or 4269 // it's the special internal property "jdk.boot.class.path.append". 4270 for (prop = pl; prop != NULL; prop = prop->next()) { 4271 if (strcmp(key, prop->key()) == 0) { 4272 if (!prop->internal()) { 4273 return prop->value(); 4274 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4275 return prop->value(); 4276 } else { 4277 // Property is internal and not jdk.boot.class.path.append so return NULL. 4278 return NULL; 4279 } 4280 } 4281 } 4282 return NULL; 4283 } 4284 4285 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4286 int count = 0; 4287 const char* ret_val = NULL; 4288 4289 while(pl != NULL) { 4290 if(count >= index) { 4291 ret_val = pl->key(); 4292 break; 4293 } 4294 count++; 4295 pl = pl->next(); 4296 } 4297 4298 return ret_val; 4299 } 4300 4301 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4302 int count = 0; 4303 char* ret_val = NULL; 4304 4305 while(pl != NULL) { 4306 if(count >= index) { 4307 ret_val = pl->value(); 4308 break; 4309 } 4310 count++; 4311 pl = pl->next(); 4312 } 4313 4314 return ret_val; 4315 } 4316 4317 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4318 SystemProperty* p = *plist; 4319 if (p == NULL) { 4320 *plist = new_p; 4321 } else { 4322 while (p->next() != NULL) { 4323 p = p->next(); 4324 } 4325 p->set_next(new_p); 4326 } 4327 } 4328 4329 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4330 bool writeable, bool internal) { 4331 if (plist == NULL) 4332 return; 4333 4334 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4335 PropertyList_add(plist, new_p); 4336 } 4337 4338 void Arguments::PropertyList_add(SystemProperty *element) { 4339 PropertyList_add(&_system_properties, element); 4340 } 4341 4342 // This add maintains unique property key in the list. 4343 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4344 PropertyAppendable append, PropertyWriteable writeable, 4345 PropertyInternal internal) { 4346 if (plist == NULL) 4347 return; 4348 4349 // If property key exist then update with new value. 4350 SystemProperty* prop; 4351 for (prop = *plist; prop != NULL; prop = prop->next()) { 4352 if (strcmp(k, prop->key()) == 0) { 4353 if (append == AppendProperty) { 4354 prop->append_value(v); 4355 } else { 4356 prop->set_value(v); 4357 } 4358 return; 4359 } 4360 } 4361 4362 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4363 } 4364 4365 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4366 // Returns true if all of the source pointed by src has been copied over to 4367 // the destination buffer pointed by buf. Otherwise, returns false. 4368 // Notes: 4369 // 1. If the length (buflen) of the destination buffer excluding the 4370 // NULL terminator character is not long enough for holding the expanded 4371 // pid characters, it also returns false instead of returning the partially 4372 // expanded one. 4373 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4374 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4375 char* buf, size_t buflen) { 4376 const char* p = src; 4377 char* b = buf; 4378 const char* src_end = &src[srclen]; 4379 char* buf_end = &buf[buflen - 1]; 4380 4381 while (p < src_end && b < buf_end) { 4382 if (*p == '%') { 4383 switch (*(++p)) { 4384 case '%': // "%%" ==> "%" 4385 *b++ = *p++; 4386 break; 4387 case 'p': { // "%p" ==> current process id 4388 // buf_end points to the character before the last character so 4389 // that we could write '\0' to the end of the buffer. 4390 size_t buf_sz = buf_end - b + 1; 4391 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4392 4393 // if jio_snprintf fails or the buffer is not long enough to hold 4394 // the expanded pid, returns false. 4395 if (ret < 0 || ret >= (int)buf_sz) { 4396 return false; 4397 } else { 4398 b += ret; 4399 assert(*b == '\0', "fail in copy_expand_pid"); 4400 if (p == src_end && b == buf_end + 1) { 4401 // reach the end of the buffer. 4402 return true; 4403 } 4404 } 4405 p++; 4406 break; 4407 } 4408 default : 4409 *b++ = '%'; 4410 } 4411 } else { 4412 *b++ = *p++; 4413 } 4414 } 4415 *b = '\0'; 4416 return (p == src_end); // return false if not all of the source was copied 4417 }