1 /* 2 * Copyright (c) 1997, 2024, 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 "cds/cds_globals.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/filemap.hpp" 29 #include "cds/heapShared.hpp" 30 #include "classfile/classLoader.hpp" 31 #include "classfile/javaAssertions.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/stringTable.hpp" 34 #include "classfile/symbolTable.hpp" 35 #include "compiler/compilerDefinitions.hpp" 36 #include "gc/shared/gcArguments.hpp" 37 #include "gc/shared/gcConfig.hpp" 38 #include "gc/shared/genArguments.hpp" 39 #include "gc/shared/stringdedup/stringDedup.hpp" 40 #include "gc/shared/tlab_globals.hpp" 41 #include "jvm.h" 42 #include "logging/log.hpp" 43 #include "logging/logConfiguration.hpp" 44 #include "logging/logStream.hpp" 45 #include "logging/logTag.hpp" 46 #include "memory/allocation.inline.hpp" 47 #include "nmt/nmtCommon.hpp" 48 #include "oops/compressedKlass.hpp" 49 #include "oops/instanceKlass.hpp" 50 #include "oops/oop.inline.hpp" 51 #include "prims/jvmtiAgentList.hpp" 52 #include "prims/jvmtiExport.hpp" 53 #include "runtime/arguments.hpp" 54 #include "runtime/flags/jvmFlag.hpp" 55 #include "runtime/flags/jvmFlagAccess.hpp" 56 #include "runtime/flags/jvmFlagLimit.hpp" 57 #include "runtime/globals_extension.hpp" 58 #include "runtime/java.hpp" 59 #include "runtime/os.hpp" 60 #include "runtime/safepoint.hpp" 61 #include "runtime/safepointMechanism.hpp" 62 #include "runtime/synchronizer.hpp" 63 #include "runtime/vm_version.hpp" 64 #include "services/management.hpp" 65 #include "utilities/align.hpp" 66 #include "utilities/checkedCast.hpp" 67 #include "utilities/debug.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/macros.hpp" 70 #include "utilities/parseInteger.hpp" 71 #include "utilities/powerOfTwo.hpp" 72 #include "utilities/stringUtils.hpp" 73 #include "utilities/systemMemoryBarrier.hpp" 74 #if INCLUDE_JFR 75 #include "jfr/jfr.hpp" 76 #endif 77 78 #include <limits> 79 80 static const char _default_java_launcher[] = "generic"; 81 82 #define DEFAULT_JAVA_LAUNCHER _default_java_launcher 83 84 char* Arguments::_jvm_flags_file = nullptr; 85 char** Arguments::_jvm_flags_array = nullptr; 86 int Arguments::_num_jvm_flags = 0; 87 char** Arguments::_jvm_args_array = nullptr; 88 int Arguments::_num_jvm_args = 0; 89 char* Arguments::_java_command = nullptr; 90 SystemProperty* Arguments::_system_properties = nullptr; 91 size_t Arguments::_conservative_max_heap_alignment = 0; 92 Arguments::Mode Arguments::_mode = _mixed; 93 const char* Arguments::_java_vendor_url_bug = nullptr; 94 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 95 bool Arguments::_sun_java_launcher_is_altjvm = false; 96 97 // These parameters are reset in method parse_vm_init_args() 98 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 99 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 100 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 101 bool Arguments::_ClipInlining = ClipInlining; 102 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 103 104 bool Arguments::_enable_preview = false; 105 106 LegacyGCLogging Arguments::_legacyGCLogging = { 0, 0 }; 107 108 // These are not set by the JDK's built-in launchers, but they can be set by 109 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 110 // JavaVMOption in jni.h. 111 abort_hook_t Arguments::_abort_hook = nullptr; 112 exit_hook_t Arguments::_exit_hook = nullptr; 113 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr; 114 115 116 SystemProperty *Arguments::_sun_boot_library_path = nullptr; 117 SystemProperty *Arguments::_java_library_path = nullptr; 118 SystemProperty *Arguments::_java_home = nullptr; 119 SystemProperty *Arguments::_java_class_path = nullptr; 120 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr; 121 SystemProperty *Arguments::_vm_info = nullptr; 122 123 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr; 124 PathString *Arguments::_boot_class_path = nullptr; 125 bool Arguments::_has_jimage = false; 126 127 char* Arguments::_ext_dirs = nullptr; 128 129 // True if -Xshare:auto option was specified. 130 static bool xshare_auto_cmd_line = false; 131 132 // True if -Xint/-Xmixed/-Xcomp were specified 133 static bool mode_flag_cmd_line = false; 134 135 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 136 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 137 if (new_value == nullptr) { 138 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 139 return false; 140 } 141 if (_value != nullptr) { 142 FreeHeap(_value); 143 } 144 _value = new_value; 145 strcpy(_value, value); 146 return true; 147 } 148 149 void PathString::append_value(const char *value) { 150 char *sp; 151 size_t len = 0; 152 if (value != nullptr) { 153 len = strlen(value); 154 if (_value != nullptr) { 155 len += strlen(_value); 156 } 157 sp = AllocateHeap(len+2, mtArguments); 158 assert(sp != nullptr, "Unable to allocate space for new append path value"); 159 if (sp != nullptr) { 160 if (_value != nullptr) { 161 strcpy(sp, _value); 162 strcat(sp, os::path_separator()); 163 strcat(sp, value); 164 FreeHeap(_value); 165 } else { 166 strcpy(sp, value); 167 } 168 _value = sp; 169 } 170 } 171 } 172 173 PathString::PathString(const char* value) { 174 if (value == nullptr) { 175 _value = nullptr; 176 } else { 177 _value = AllocateHeap(strlen(value)+1, mtArguments); 178 strcpy(_value, value); 179 } 180 } 181 182 PathString::~PathString() { 183 if (_value != nullptr) { 184 FreeHeap(_value); 185 _value = nullptr; 186 } 187 } 188 189 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 190 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value"); 191 size_t len = strlen(module_name) + 1; 192 _module_name = AllocateHeap(len, mtInternal); 193 strncpy(_module_name, module_name, len); // copy the trailing null 194 _path = new PathString(path); 195 } 196 197 ModulePatchPath::~ModulePatchPath() { 198 if (_module_name != nullptr) { 199 FreeHeap(_module_name); 200 _module_name = nullptr; 201 } 202 if (_path != nullptr) { 203 delete _path; 204 _path = nullptr; 205 } 206 } 207 208 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 209 if (key == nullptr) { 210 _key = nullptr; 211 } else { 212 _key = AllocateHeap(strlen(key)+1, mtArguments); 213 strcpy(_key, key); 214 } 215 _next = nullptr; 216 _internal = internal; 217 _writeable = writeable; 218 } 219 220 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 221 // part of the option string. 222 static bool match_option(const JavaVMOption *option, const char* name, 223 const char** tail) { 224 size_t len = strlen(name); 225 if (strncmp(option->optionString, name, len) == 0) { 226 *tail = option->optionString + len; 227 return true; 228 } else { 229 return false; 230 } 231 } 232 233 // Check if 'option' matches 'name'. No "tail" is allowed. 234 static bool match_option(const JavaVMOption *option, const char* name) { 235 const char* tail = nullptr; 236 bool result = match_option(option, name, &tail); 237 if (tail != nullptr && *tail == '\0') { 238 return result; 239 } else { 240 return false; 241 } 242 } 243 244 // Return true if any of the strings in null-terminated array 'names' matches. 245 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 246 // the option must match exactly. 247 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 248 bool tail_allowed) { 249 for (/* empty */; *names != nullptr; ++names) { 250 if (match_option(option, *names, tail)) { 251 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 252 return true; 253 } 254 } 255 } 256 return false; 257 } 258 259 #if INCLUDE_JFR 260 static bool _has_jfr_option = false; // is using JFR 261 262 // return true on failure 263 static bool match_jfr_option(const JavaVMOption** option) { 264 assert((*option)->optionString != nullptr, "invariant"); 265 char* tail = nullptr; 266 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 267 _has_jfr_option = true; 268 return Jfr::on_start_flight_recording_option(option, tail); 269 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 270 _has_jfr_option = true; 271 return Jfr::on_flight_recorder_option(option, tail); 272 } 273 return false; 274 } 275 276 bool Arguments::has_jfr_option() { 277 return _has_jfr_option; 278 } 279 #endif 280 281 static void logOption(const char* opt) { 282 if (PrintVMOptions) { 283 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 284 } 285 } 286 287 bool needs_module_property_warning = false; 288 289 #define MODULE_PROPERTY_PREFIX "jdk.module." 290 #define MODULE_PROPERTY_PREFIX_LEN 11 291 #define ADDEXPORTS "addexports" 292 #define ADDEXPORTS_LEN 10 293 #define ADDREADS "addreads" 294 #define ADDREADS_LEN 8 295 #define ADDOPENS "addopens" 296 #define ADDOPENS_LEN 8 297 #define PATCH "patch" 298 #define PATCH_LEN 5 299 #define ADDMODS "addmods" 300 #define ADDMODS_LEN 7 301 #define LIMITMODS "limitmods" 302 #define LIMITMODS_LEN 9 303 #define PATH "path" 304 #define PATH_LEN 4 305 #define UPGRADE_PATH "upgrade.path" 306 #define UPGRADE_PATH_LEN 12 307 #define ENABLE_NATIVE_ACCESS "enable.native.access" 308 #define ENABLE_NATIVE_ACCESS_LEN 20 309 310 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 311 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 312 return ((strncmp(option, property, len) == 0) && 313 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 314 } 315 316 // Return true if property starts with "jdk.module." and its ensuing chars match 317 // any of the reserved module properties. 318 // property should be passed without the leading "-D". 319 bool Arguments::is_internal_module_property(const char* property) { 320 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 321 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 322 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 323 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 324 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 325 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 326 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 327 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 328 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 329 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 330 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 331 return true; 332 } 333 } 334 return false; 335 } 336 337 // Process java launcher properties. 338 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 339 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 340 // Must do this before setting up other system properties, 341 // as some of them may depend on launcher type. 342 for (int index = 0; index < args->nOptions; index++) { 343 const JavaVMOption* option = args->options + index; 344 const char* tail; 345 346 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 347 process_java_launcher_argument(tail, option->extraInfo); 348 continue; 349 } 350 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 351 if (strcmp(tail, "true") == 0) { 352 _sun_java_launcher_is_altjvm = true; 353 } 354 continue; 355 } 356 } 357 } 358 359 // Initialize system properties key and value. 360 void Arguments::init_system_properties() { 361 362 // Set up _boot_class_path which is not a property but 363 // relies heavily on argument processing and the jdk.boot.class.path.append 364 // property. It is used to store the underlying boot class path. 365 _boot_class_path = new PathString(nullptr); 366 367 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 368 "Java Virtual Machine Specification", false)); 369 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 370 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 371 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 372 373 // Initialize the vm.info now, but it will need updating after argument parsing. 374 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 375 376 // Following are JVMTI agent writable properties. 377 // Properties values are set to nullptr and they are 378 // os specific they are initialized in os::init_system_properties_values(). 379 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true); 380 _java_library_path = new SystemProperty("java.library.path", nullptr, true); 381 _java_home = new SystemProperty("java.home", nullptr, true); 382 _java_class_path = new SystemProperty("java.class.path", "", true); 383 // jdk.boot.class.path.append is a non-writeable, internal property. 384 // It can only be set by either: 385 // - -Xbootclasspath/a: 386 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 387 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true); 388 389 // Add to System Property list. 390 PropertyList_add(&_system_properties, _sun_boot_library_path); 391 PropertyList_add(&_system_properties, _java_library_path); 392 PropertyList_add(&_system_properties, _java_home); 393 PropertyList_add(&_system_properties, _java_class_path); 394 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 395 PropertyList_add(&_system_properties, _vm_info); 396 397 // Set OS specific system properties values 398 os::init_system_properties_values(); 399 } 400 401 // Update/Initialize System properties after JDK version number is known 402 void Arguments::init_version_specific_system_properties() { 403 enum { bufsz = 16 }; 404 char buffer[bufsz]; 405 const char* spec_vendor = "Oracle Corporation"; 406 uint32_t spec_version = JDK_Version::current().major_version(); 407 408 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 409 410 PropertyList_add(&_system_properties, 411 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 412 PropertyList_add(&_system_properties, 413 new SystemProperty("java.vm.specification.version", buffer, false)); 414 PropertyList_add(&_system_properties, 415 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 416 } 417 418 /* 419 * -XX argument processing: 420 * 421 * -XX arguments are defined in several places, such as: 422 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 423 * -XX arguments are parsed in parse_argument(). 424 * -XX argument bounds checking is done in check_vm_args_consistency(). 425 * 426 * Over time -XX arguments may change. There are mechanisms to handle common cases: 427 * 428 * ALIASED: An option that is simply another name for another option. This is often 429 * part of the process of deprecating a flag, but not all aliases need 430 * to be deprecated. 431 * 432 * Create an alias for an option by adding the old and new option names to the 433 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 434 * 435 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 436 * support may be removed in the future. Both regular and aliased options may be 437 * deprecated. 438 * 439 * Add a deprecation warning for an option (or alias) by adding an entry in the 440 * "special_jvm_flags" table and setting the "deprecated_in" field. 441 * Often an option "deprecated" in one major release will 442 * be made "obsolete" in the next. In this case the entry should also have its 443 * "obsolete_in" field set. 444 * 445 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 446 * on the command line. A warning is printed to let the user know that option might not 447 * be accepted in the future. 448 * 449 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 450 * table and setting the "obsolete_in" field. 451 * 452 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 453 * to the current JDK version. The system will flatly refuse to admit the existence of 454 * the flag. This allows a flag to die automatically over JDK releases. 455 * 456 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 457 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 458 * - Newly obsolete or expired deprecated options should have their global variable 459 * definitions removed (from globals.hpp, etc) and related implementations removed. 460 * 461 * Recommended approach for removing options: 462 * 463 * To remove options commonly used by customers (e.g. product -XX options), use 464 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 465 * 466 * To remove internal options (e.g. diagnostic, experimental, develop options), use 467 * a 2-step model adding major release numbers to the obsolete and expire columns. 468 * 469 * To change the name of an option, use the alias table as well as a 2-step 470 * model adding major release numbers to the deprecate and expire columns. 471 * Think twice about aliasing commonly used customer options. 472 * 473 * There are times when it is appropriate to leave a future release number as undefined. 474 * 475 * Tests: Aliases should be tested in VMAliasOptions.java. 476 * Deprecated options should be tested in VMDeprecatedOptions.java. 477 */ 478 479 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 480 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 481 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 482 // the command-line as usual, but will issue a warning. 483 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 484 // the command-line, while issuing a warning and ignoring the flag value. 485 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 486 // existence of the flag. 487 // 488 // MANUAL CLEANUP ON JDK VERSION UPDATES: 489 // This table ensures that the handling of options will update automatically when the JDK 490 // version is incremented, but the source code needs to be cleanup up manually: 491 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 492 // variable should be removed, as well as users of the variable. 493 // - As "deprecated" options age into "obsolete" options, move the entry into the 494 // "Obsolete Flags" section of the table. 495 // - All expired options should be removed from the table. 496 static SpecialFlag const special_jvm_flags[] = { 497 // -------------- Deprecated Flags -------------- 498 // --- Non-alias flags - sorted by obsolete_in then expired_in: 499 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 500 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 501 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::undefined(), JDK_Version::undefined() }, 502 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 503 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 504 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 505 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 506 { "DontYieldALot", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 507 { "PreserveAllAnnotations", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 508 { "UseNotificationThread", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 509 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 510 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 511 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 512 513 // -------------- Obsolete Flags - sorted by expired_in -------------- 514 515 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 516 517 { "UseEmptySlotsInSupers", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 518 { "OldSize", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 519 #if defined(X86) 520 { "UseRTMLocking", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 521 { "UseRTMDeopt", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 522 { "RTMRetryCount", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 523 #endif // X86 524 525 { "HeapFirstMaximumCompactionCount", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 526 { "UseVtableBasedCHA", JDK_Version::undefined(), JDK_Version::jdk(24), JDK_Version::jdk(25) }, 527 #ifdef ASSERT 528 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 529 #endif 530 531 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 532 // These entries will generate build errors. Their purpose is to test the macros. 533 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 534 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 535 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 536 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 537 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 538 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 539 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 540 #endif 541 542 { nullptr, JDK_Version(0), JDK_Version(0) } 543 }; 544 545 // Flags that are aliases for other flags. 546 typedef struct { 547 const char* alias_name; 548 const char* real_name; 549 } AliasedFlag; 550 551 static AliasedFlag const aliased_jvm_flags[] = { 552 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 553 { nullptr, nullptr} 554 }; 555 556 // Return true if "v" is less than "other", where "other" may be "undefined". 557 static bool version_less_than(JDK_Version v, JDK_Version other) { 558 assert(!v.is_undefined(), "must be defined"); 559 if (!other.is_undefined() && v.compare(other) >= 0) { 560 return false; 561 } else { 562 return true; 563 } 564 } 565 566 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 567 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 568 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 569 flag = special_jvm_flags[i]; 570 return true; 571 } 572 } 573 return false; 574 } 575 576 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 577 assert(version != nullptr, "Must provide a version buffer"); 578 SpecialFlag flag; 579 if (lookup_special_flag(flag_name, flag)) { 580 if (!flag.obsolete_in.is_undefined()) { 581 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 582 *version = flag.obsolete_in; 583 // This flag may have been marked for obsoletion in this version, but we may not 584 // have actually removed it yet. Rather than ignoring it as soon as we reach 585 // this version we allow some time for the removal to happen. So if the flag 586 // still actually exists we process it as normal, but issue an adjusted warning. 587 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 588 if (real_flag != nullptr) { 589 char version_str[256]; 590 version->to_string(version_str, sizeof(version_str)); 591 warning("Temporarily processing option %s; support is scheduled for removal in %s", 592 flag_name, version_str); 593 return false; 594 } 595 return true; 596 } 597 } 598 } 599 return false; 600 } 601 602 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 603 assert(version != nullptr, "Must provide a version buffer"); 604 SpecialFlag flag; 605 if (lookup_special_flag(flag_name, flag)) { 606 if (!flag.deprecated_in.is_undefined()) { 607 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 608 version_less_than(JDK_Version::current(), flag.expired_in)) { 609 *version = flag.deprecated_in; 610 return 1; 611 } else { 612 return -1; 613 } 614 } 615 } 616 return 0; 617 } 618 619 const char* Arguments::real_flag_name(const char *flag_name) { 620 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) { 621 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 622 if (strcmp(flag_status.alias_name, flag_name) == 0) { 623 return flag_status.real_name; 624 } 625 } 626 return flag_name; 627 } 628 629 #ifdef ASSERT 630 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 631 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 632 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 633 return true; 634 } 635 } 636 return false; 637 } 638 639 // Verifies the correctness of the entries in the special_jvm_flags table. 640 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 641 // version being earlier than the deprecation version, then a warning is issued 642 // and verification fails - by returning false. If it is detected that the table 643 // is out of date, with respect to the current version, then ideally a warning is 644 // issued but verification does not fail. This allows the VM to operate when the 645 // version is first updated, without needing to update all the impacted flags at 646 // the same time. In practice we can't issue the warning immediately when the version 647 // is updated as it occurs for every test and some tests are not prepared to handle 648 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 649 // if the check_globals flag is true, and in addition allow a grace period and only 650 // check for stale flags when we hit build 25 (which is far enough into the 6 month 651 // release cycle that all flag updates should have been processed, whilst still 652 // leaving time to make the change before RDP2). 653 // We use a gtest to call this, passing true, so that we can detect stale flags before 654 // the end of the release cycle. 655 656 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 657 658 bool Arguments::verify_special_jvm_flags(bool check_globals) { 659 bool success = true; 660 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 661 const SpecialFlag& flag = special_jvm_flags[i]; 662 if (lookup_special_flag(flag.name, i)) { 663 warning("Duplicate special flag declaration \"%s\"", flag.name); 664 success = false; 665 } 666 if (flag.deprecated_in.is_undefined() && 667 flag.obsolete_in.is_undefined()) { 668 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 669 success = false; 670 } 671 672 if (!flag.deprecated_in.is_undefined()) { 673 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 674 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 675 success = false; 676 } 677 678 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 679 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 680 success = false; 681 } 682 } 683 684 if (!flag.obsolete_in.is_undefined()) { 685 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 686 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 687 success = false; 688 } 689 690 // if flag has become obsolete it should not have a "globals" flag defined anymore. 691 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 692 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 693 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 694 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 695 success = false; 696 } 697 } 698 699 } else if (!flag.expired_in.is_undefined()) { 700 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 701 success = false; 702 } 703 704 if (!flag.expired_in.is_undefined()) { 705 // if flag has become expired it should not have a "globals" flag defined anymore. 706 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 707 !version_less_than(JDK_Version::current(), flag.expired_in)) { 708 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 709 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 710 success = false; 711 } 712 } 713 } 714 } 715 return success; 716 } 717 #endif 718 719 bool Arguments::atojulong(const char *s, julong* result) { 720 return parse_integer(s, result); 721 } 722 723 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 724 if (size < min_size) return arg_too_small; 725 if (size > max_size) return arg_too_big; 726 return arg_in_range; 727 } 728 729 // Describe an argument out of range error 730 void Arguments::describe_range_error(ArgsRange errcode) { 731 switch(errcode) { 732 case arg_too_big: 733 jio_fprintf(defaultStream::error_stream(), 734 "The specified size exceeds the maximum " 735 "representable size.\n"); 736 break; 737 case arg_too_small: 738 case arg_unreadable: 739 case arg_in_range: 740 // do nothing for now 741 break; 742 default: 743 ShouldNotReachHere(); 744 } 745 } 746 747 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 748 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 749 return true; 750 } else { 751 return false; 752 } 753 } 754 755 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 756 // strtod allows leading whitespace, but our flag format does not. 757 if (*value == '\0' || isspace((unsigned char) *value)) { 758 return false; 759 } 760 char* end; 761 errno = 0; 762 double v = strtod(value, &end); 763 if ((errno != 0) || (*end != 0)) { 764 return false; 765 } 766 if (g_isnan(v) || !g_isfinite(v)) { 767 // Currently we cannot handle these special values. 768 return false; 769 } 770 771 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 772 return true; 773 } 774 return false; 775 } 776 777 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 778 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 779 780 if (flag->is_int()) { 781 int v; 782 if (parse_integer(value, &v)) { 783 result = JVMFlagAccess::set_int(flag, &v, origin); 784 } 785 } else if (flag->is_uint()) { 786 uint v; 787 if (parse_integer(value, &v)) { 788 result = JVMFlagAccess::set_uint(flag, &v, origin); 789 } 790 } else if (flag->is_intx()) { 791 intx v; 792 if (parse_integer(value, &v)) { 793 result = JVMFlagAccess::set_intx(flag, &v, origin); 794 } 795 } else if (flag->is_uintx()) { 796 uintx v; 797 if (parse_integer(value, &v)) { 798 result = JVMFlagAccess::set_uintx(flag, &v, origin); 799 } 800 } else if (flag->is_uint64_t()) { 801 uint64_t v; 802 if (parse_integer(value, &v)) { 803 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 804 } 805 } else if (flag->is_size_t()) { 806 size_t v; 807 if (parse_integer(value, &v)) { 808 result = JVMFlagAccess::set_size_t(flag, &v, origin); 809 } 810 } 811 812 return result == JVMFlag::SUCCESS; 813 } 814 815 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 816 if (value[0] == '\0') { 817 value = nullptr; 818 } 819 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 820 // Contract: JVMFlag always returns a pointer that needs freeing. 821 FREE_C_HEAP_ARRAY(char, value); 822 return true; 823 } 824 825 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 826 const char* old_value = ""; 827 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 828 size_t old_len = old_value != nullptr ? strlen(old_value) : 0; 829 size_t new_len = strlen(new_value); 830 const char* value; 831 char* free_this_too = nullptr; 832 if (old_len == 0) { 833 value = new_value; 834 } else if (new_len == 0) { 835 value = old_value; 836 } else { 837 size_t length = old_len + 1 + new_len + 1; 838 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 839 // each new setting adds another LINE to the switch: 840 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 841 value = buf; 842 free_this_too = buf; 843 } 844 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 845 // JVMFlag always returns a pointer that needs freeing. 846 FREE_C_HEAP_ARRAY(char, value); 847 // JVMFlag made its own copy, so I must delete my own temp. buffer. 848 FREE_C_HEAP_ARRAY(char, free_this_too); 849 return true; 850 } 851 852 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 853 const char* real_name = real_flag_name(arg); 854 JDK_Version since = JDK_Version(); 855 switch (is_deprecated_flag(arg, &since)) { 856 case -1: { 857 // Obsolete or expired, so don't process normally, 858 // but allow for an obsolete flag we're still 859 // temporarily allowing. 860 if (!is_obsolete_flag(arg, &since)) { 861 return real_name; 862 } 863 // Note if we're not considered obsolete then we can't be expired either 864 // as obsoletion must come first. 865 return nullptr; 866 } 867 case 0: 868 return real_name; 869 case 1: { 870 char version[256]; 871 since.to_string(version, sizeof(version)); 872 if (real_name != arg) { 873 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 874 arg, version, real_name); 875 } else { 876 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 877 arg, version); 878 } 879 return real_name; 880 } 881 } 882 ShouldNotReachHere(); 883 return nullptr; 884 } 885 886 #define BUFLEN 255 887 888 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 889 char name_copied[BUFLEN+1]; 890 if (name[name_length] != 0) { 891 if (name_length > BUFLEN) { 892 return nullptr; 893 } else { 894 strncpy(name_copied, name, name_length); 895 name_copied[name_length] = '\0'; 896 name = name_copied; 897 } 898 } 899 900 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 901 if (real_name == nullptr) { 902 return nullptr; 903 } 904 JVMFlag* flag = JVMFlag::find_flag(real_name); 905 return flag; 906 } 907 908 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 909 bool is_bool = false; 910 bool bool_val = false; 911 char c = *arg; 912 if (c == '+' || c == '-') { 913 is_bool = true; 914 bool_val = (c == '+'); 915 arg++; 916 } 917 918 const char* name = arg; 919 while (true) { 920 c = *arg; 921 if (isalnum(c) || (c == '_')) { 922 ++arg; 923 } else { 924 break; 925 } 926 } 927 928 size_t name_len = size_t(arg - name); 929 if (name_len == 0) { 930 return false; 931 } 932 933 JVMFlag* flag = find_jvm_flag(name, name_len); 934 if (flag == nullptr) { 935 return false; 936 } 937 938 if (is_bool) { 939 if (*arg != 0) { 940 // Error -- extra characters such as -XX:+BoolFlag=123 941 return false; 942 } 943 return set_bool_flag(flag, bool_val, origin); 944 } 945 946 if (arg[0] == '=') { 947 const char* value = arg + 1; 948 if (flag->is_ccstr()) { 949 if (flag->ccstr_accumulates()) { 950 return append_to_string_flag(flag, value, origin); 951 } else { 952 return set_string_flag(flag, value, origin); 953 } 954 } else if (flag->is_double()) { 955 return set_fp_numeric_flag(flag, value, origin); 956 } else { 957 return set_numeric_flag(flag, value, origin); 958 } 959 } 960 961 if (arg[0] == ':' && arg[1] == '=') { 962 // -XX:Foo:=xxx will reset the string flag to the given value. 963 const char* value = arg + 2; 964 return set_string_flag(flag, value, origin); 965 } 966 967 return false; 968 } 969 970 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 971 assert(bldarray != nullptr, "illegal argument"); 972 973 if (arg == nullptr) { 974 return; 975 } 976 977 int new_count = *count + 1; 978 979 // expand the array and add arg to the last element 980 if (*bldarray == nullptr) { 981 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 982 } else { 983 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 984 } 985 (*bldarray)[*count] = os::strdup_check_oom(arg); 986 *count = new_count; 987 } 988 989 void Arguments::build_jvm_args(const char* arg) { 990 add_string(&_jvm_args_array, &_num_jvm_args, arg); 991 } 992 993 void Arguments::build_jvm_flags(const char* arg) { 994 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 995 } 996 997 // utility function to return a string that concatenates all 998 // strings in a given char** array 999 const char* Arguments::build_resource_string(char** args, int count) { 1000 if (args == nullptr || count == 0) { 1001 return nullptr; 1002 } 1003 size_t length = 0; 1004 for (int i = 0; i < count; i++) { 1005 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character 1006 } 1007 char* s = NEW_RESOURCE_ARRAY(char, length); 1008 char* dst = s; 1009 for (int j = 0; j < count; j++) { 1010 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character 1011 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character 1012 dst += offset; 1013 length -= offset; 1014 } 1015 return (const char*) s; 1016 } 1017 1018 void Arguments::print_on(outputStream* st) { 1019 st->print_cr("VM Arguments:"); 1020 if (num_jvm_flags() > 0) { 1021 st->print("jvm_flags: "); print_jvm_flags_on(st); 1022 st->cr(); 1023 } 1024 if (num_jvm_args() > 0) { 1025 st->print("jvm_args: "); print_jvm_args_on(st); 1026 st->cr(); 1027 } 1028 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1029 if (_java_class_path != nullptr) { 1030 char* path = _java_class_path->value(); 1031 size_t len = strlen(path); 1032 st->print("java_class_path (initial): "); 1033 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1034 if (len == 0) { 1035 st->print_raw_cr("<not set>"); 1036 } else { 1037 st->print_raw_cr(path, len); 1038 } 1039 } 1040 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1041 } 1042 1043 void Arguments::print_summary_on(outputStream* st) { 1044 // Print the command line. Environment variables that are helpful for 1045 // reproducing the problem are written later in the hs_err file. 1046 // flags are from setting file 1047 if (num_jvm_flags() > 0) { 1048 st->print_raw("Settings File: "); 1049 print_jvm_flags_on(st); 1050 st->cr(); 1051 } 1052 // args are the command line and environment variable arguments. 1053 st->print_raw("Command Line: "); 1054 if (num_jvm_args() > 0) { 1055 print_jvm_args_on(st); 1056 } 1057 // this is the classfile and any arguments to the java program 1058 if (java_command() != nullptr) { 1059 st->print("%s", java_command()); 1060 } 1061 st->cr(); 1062 } 1063 1064 void Arguments::print_jvm_flags_on(outputStream* st) { 1065 if (_num_jvm_flags > 0) { 1066 for (int i=0; i < _num_jvm_flags; i++) { 1067 st->print("%s ", _jvm_flags_array[i]); 1068 } 1069 } 1070 } 1071 1072 void Arguments::print_jvm_args_on(outputStream* st) { 1073 if (_num_jvm_args > 0) { 1074 for (int i=0; i < _num_jvm_args; i++) { 1075 st->print("%s ", _jvm_args_array[i]); 1076 } 1077 } 1078 } 1079 1080 bool Arguments::process_argument(const char* arg, 1081 jboolean ignore_unrecognized, 1082 JVMFlagOrigin origin) { 1083 JDK_Version since = JDK_Version(); 1084 1085 if (parse_argument(arg, origin)) { 1086 return true; 1087 } 1088 1089 // Determine if the flag has '+', '-', or '=' characters. 1090 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1091 const char* const argname = has_plus_minus ? arg + 1 : arg; 1092 1093 size_t arg_len; 1094 const char* equal_sign = strchr(argname, '='); 1095 if (equal_sign == nullptr) { 1096 arg_len = strlen(argname); 1097 } else { 1098 arg_len = equal_sign - argname; 1099 } 1100 1101 // Only make the obsolete check for valid arguments. 1102 if (arg_len <= BUFLEN) { 1103 // Construct a string which consists only of the argument name without '+', '-', or '='. 1104 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1105 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1106 if (is_obsolete_flag(stripped_argname, &since)) { 1107 char version[256]; 1108 since.to_string(version, sizeof(version)); 1109 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1110 return true; 1111 } 1112 } 1113 1114 // For locked flags, report a custom error message if available. 1115 // Otherwise, report the standard unrecognized VM option. 1116 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1117 if (found_flag != nullptr) { 1118 char locked_message_buf[BUFLEN]; 1119 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1120 if (strlen(locked_message_buf) != 0) { 1121 #ifdef PRODUCT 1122 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD; 1123 if (ignore_unrecognized && mismatched) { 1124 return true; 1125 } 1126 #endif 1127 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1128 } 1129 if (found_flag->is_bool() && !has_plus_minus) { 1130 jio_fprintf(defaultStream::error_stream(), 1131 "Missing +/- setting for VM option '%s'\n", argname); 1132 } else if (!found_flag->is_bool() && has_plus_minus) { 1133 jio_fprintf(defaultStream::error_stream(), 1134 "Unexpected +/- setting in VM option '%s'\n", argname); 1135 } else { 1136 jio_fprintf(defaultStream::error_stream(), 1137 "Improperly specified VM option '%s'\n", argname); 1138 } 1139 } else { 1140 if (ignore_unrecognized) { 1141 return true; 1142 } 1143 jio_fprintf(defaultStream::error_stream(), 1144 "Unrecognized VM option '%s'\n", argname); 1145 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1146 if (fuzzy_matched != nullptr) { 1147 jio_fprintf(defaultStream::error_stream(), 1148 "Did you mean '%s%s%s'?\n", 1149 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1150 fuzzy_matched->name(), 1151 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1152 } 1153 } 1154 1155 // allow for commandline "commenting out" options like -XX:#+Verbose 1156 return arg[0] == '#'; 1157 } 1158 1159 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1160 FILE* stream = os::fopen(file_name, "rb"); 1161 if (stream == nullptr) { 1162 if (should_exist) { 1163 jio_fprintf(defaultStream::error_stream(), 1164 "Could not open settings file %s\n", file_name); 1165 return false; 1166 } else { 1167 return true; 1168 } 1169 } 1170 1171 char token[1024]; 1172 int pos = 0; 1173 1174 bool in_white_space = true; 1175 bool in_comment = false; 1176 bool in_quote = false; 1177 int quote_c = 0; 1178 bool result = true; 1179 1180 int c = getc(stream); 1181 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1182 if (in_white_space) { 1183 if (in_comment) { 1184 if (c == '\n') in_comment = false; 1185 } else { 1186 if (c == '#') in_comment = true; 1187 else if (!isspace((unsigned char) c)) { 1188 in_white_space = false; 1189 token[pos++] = checked_cast<char>(c); 1190 } 1191 } 1192 } else { 1193 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) { 1194 // token ends at newline, or at unquoted whitespace 1195 // this allows a way to include spaces in string-valued options 1196 token[pos] = '\0'; 1197 logOption(token); 1198 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1199 build_jvm_flags(token); 1200 pos = 0; 1201 in_white_space = true; 1202 in_quote = false; 1203 } else if (!in_quote && (c == '\'' || c == '"')) { 1204 in_quote = true; 1205 quote_c = c; 1206 } else if (in_quote && (c == quote_c)) { 1207 in_quote = false; 1208 } else { 1209 token[pos++] = checked_cast<char>(c); 1210 } 1211 } 1212 c = getc(stream); 1213 } 1214 if (pos > 0) { 1215 token[pos] = '\0'; 1216 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1217 build_jvm_flags(token); 1218 } 1219 fclose(stream); 1220 return result; 1221 } 1222 1223 //============================================================================================================= 1224 // Parsing of properties (-D) 1225 1226 const char* Arguments::get_property(const char* key) { 1227 return PropertyList_get_value(system_properties(), key); 1228 } 1229 1230 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1231 const char* eq = strchr(prop, '='); 1232 const char* key; 1233 const char* value = ""; 1234 1235 if (eq == nullptr) { 1236 // property doesn't have a value, thus use passed string 1237 key = prop; 1238 } else { 1239 // property have a value, thus extract it and save to the 1240 // allocated string 1241 size_t key_len = eq - prop; 1242 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1243 1244 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1245 key = tmp_key; 1246 1247 value = &prop[key_len + 1]; 1248 } 1249 1250 if (internal == ExternalProperty) { 1251 CDSConfig::check_incompatible_property(key, value); 1252 } 1253 1254 if (strcmp(key, "java.compiler") == 0) { 1255 // we no longer support java.compiler system property, log a warning and let it get 1256 // passed to Java, like any other system property 1257 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) { 1258 // for applications using NONE or empty value, log a more informative message 1259 warning("The java.compiler system property is obsolete and no longer supported, use -Xint"); 1260 } else { 1261 warning("The java.compiler system property is obsolete and no longer supported."); 1262 } 1263 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1264 // sun.java.launcher.is_altjvm property is 1265 // private and is processed in process_sun_java_launcher_properties(); 1266 // the sun.java.launcher property is passed on to the java application 1267 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1268 // append is true, writable is true, internal is false 1269 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1270 WriteableProperty, ExternalProperty); 1271 } else { 1272 if (strcmp(key, "sun.java.command") == 0) { 1273 char *old_java_command = _java_command; 1274 _java_command = os::strdup_check_oom(value, mtArguments); 1275 if (old_java_command != nullptr) { 1276 os::free(old_java_command); 1277 } 1278 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1279 // If this property is set on the command line then its value will be 1280 // displayed in VM error logs as the URL at which to submit such logs. 1281 // Normally the URL displayed in error logs is different from the value 1282 // of this system property, so a different property should have been 1283 // used here, but we leave this as-is in case someone depends upon it. 1284 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1285 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1286 // its value without going through the property list or making a Java call. 1287 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1288 if (old_java_vendor_url_bug != nullptr) { 1289 os::free((void *)old_java_vendor_url_bug); 1290 } 1291 } 1292 1293 // Create new property and add at the end of the list 1294 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1295 } 1296 1297 if (key != prop) { 1298 // SystemProperty copy passed value, thus free previously allocated 1299 // memory 1300 FreeHeap((void *)key); 1301 } 1302 1303 return true; 1304 } 1305 1306 //=========================================================================================================== 1307 // Setting int/mixed/comp mode flags 1308 1309 void Arguments::set_mode_flags(Mode mode) { 1310 // Set up default values for all flags. 1311 // If you add a flag to any of the branches below, 1312 // add a default value for it here. 1313 _mode = mode; 1314 1315 // Ensure Agent_OnLoad has the correct initial values. 1316 // This may not be the final mode; mode may change later in onload phase. 1317 PropertyList_unique_add(&_system_properties, "java.vm.info", 1318 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1319 1320 UseInterpreter = true; 1321 UseCompiler = true; 1322 UseLoopCounter = true; 1323 1324 // Default values may be platform/compiler dependent - 1325 // use the saved values 1326 ClipInlining = Arguments::_ClipInlining; 1327 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1328 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1329 BackgroundCompilation = Arguments::_BackgroundCompilation; 1330 1331 // Change from defaults based on mode 1332 switch (mode) { 1333 default: 1334 ShouldNotReachHere(); 1335 break; 1336 case _int: 1337 UseCompiler = false; 1338 UseLoopCounter = false; 1339 AlwaysCompileLoopMethods = false; 1340 UseOnStackReplacement = false; 1341 break; 1342 case _mixed: 1343 // same as default 1344 break; 1345 case _comp: 1346 UseInterpreter = false; 1347 BackgroundCompilation = false; 1348 ClipInlining = false; 1349 break; 1350 } 1351 } 1352 1353 // Conflict: required to use shared spaces (-Xshare:on), but 1354 // incompatible command line options were chosen. 1355 void Arguments::no_shared_spaces(const char* message) { 1356 if (RequireSharedSpaces) { 1357 jio_fprintf(defaultStream::error_stream(), 1358 "Class data sharing is inconsistent with other specified options.\n"); 1359 vm_exit_during_initialization("Unable to use shared archive", message); 1360 } else { 1361 log_info(cds)("Unable to use shared archive: %s", message); 1362 UseSharedSpaces = false; 1363 } 1364 } 1365 1366 static void set_object_alignment() { 1367 // Object alignment. 1368 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1369 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1370 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1371 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1372 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1373 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1374 1375 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1376 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1377 1378 // Oop encoding heap max 1379 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1380 } 1381 1382 size_t Arguments::max_heap_for_compressed_oops() { 1383 // Avoid sign flip. 1384 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1385 // We need to fit both the null page and the heap into the memory budget, while 1386 // keeping alignment constraints of the heap. To guarantee the latter, as the 1387 // null page is located before the heap, we pad the null page to the conservative 1388 // maximum alignment that the GC may ever impose upon the heap. 1389 size_t displacement_due_to_null_page = align_up(os::vm_page_size(), 1390 _conservative_max_heap_alignment); 1391 1392 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1393 NOT_LP64(ShouldNotReachHere(); return 0); 1394 } 1395 1396 void Arguments::set_use_compressed_oops() { 1397 #ifdef _LP64 1398 // MaxHeapSize is not set up properly at this point, but 1399 // the only value that can override MaxHeapSize if we are 1400 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1401 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1402 1403 if (max_heap_size <= max_heap_for_compressed_oops()) { 1404 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1405 FLAG_SET_ERGO(UseCompressedOops, true); 1406 } 1407 } else { 1408 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1409 warning("Max heap size too large for Compressed Oops"); 1410 FLAG_SET_DEFAULT(UseCompressedOops, false); 1411 } 1412 } 1413 #endif // _LP64 1414 } 1415 1416 void Arguments::set_use_compressed_klass_ptrs() { 1417 #ifdef _LP64 1418 assert(!UseCompressedClassPointers || CompressedClassSpaceSize <= KlassEncodingMetaspaceMax, 1419 "CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1420 #endif // _LP64 1421 } 1422 1423 void Arguments::set_conservative_max_heap_alignment() { 1424 // The conservative maximum required alignment for the heap is the maximum of 1425 // the alignments imposed by several sources: any requirements from the heap 1426 // itself and the maximum page size we may run the VM with. 1427 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1428 _conservative_max_heap_alignment = MAX4(heap_alignment, 1429 os::vm_allocation_granularity(), 1430 os::max_page_size(), 1431 GCArguments::compute_heap_alignment()); 1432 } 1433 1434 jint Arguments::set_ergonomics_flags() { 1435 GCConfig::initialize(); 1436 1437 set_conservative_max_heap_alignment(); 1438 1439 #ifdef _LP64 1440 set_use_compressed_oops(); 1441 set_use_compressed_klass_ptrs(); 1442 1443 // Also checks that certain machines are slower with compressed oops 1444 // in vm_version initialization code. 1445 #endif // _LP64 1446 1447 return JNI_OK; 1448 } 1449 1450 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1451 size_t max_allocatable; 1452 size_t result = limit; 1453 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1454 // The AggressiveHeap check is a temporary workaround to avoid calling 1455 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1456 // selected. This works because AggressiveHeap implies UseParallelGC 1457 // where we know the ratio will be 1. Once the AggressiveHeap option is 1458 // removed, this can be cleaned up. 1459 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1460 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1461 result = MIN2(result, max_allocatable / fraction); 1462 } 1463 return result; 1464 } 1465 1466 // Use static initialization to get the default before parsing 1467 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1468 1469 void Arguments::set_heap_size() { 1470 julong phys_mem; 1471 1472 // If the user specified one of these options, they 1473 // want specific memory sizing so do not limit memory 1474 // based on compressed oops addressability. 1475 // Also, memory limits will be calculated based on 1476 // available os physical memory, not our MaxRAM limit, 1477 // unless MaxRAM is also specified. 1478 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1479 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1480 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1481 !FLAG_IS_DEFAULT(MaxRAM)); 1482 if (override_coop_limit) { 1483 if (FLAG_IS_DEFAULT(MaxRAM)) { 1484 phys_mem = os::physical_memory(); 1485 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1486 } else { 1487 phys_mem = (julong)MaxRAM; 1488 } 1489 } else { 1490 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1491 : (julong)MaxRAM; 1492 } 1493 1494 // If the maximum heap size has not been set with -Xmx, 1495 // then set it as fraction of the size of physical memory, 1496 // respecting the maximum and minimum sizes of the heap. 1497 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1498 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100); 1499 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100); 1500 if (reasonable_min < MaxHeapSize) { 1501 // Small physical memory, so use a minimum fraction of it for the heap 1502 reasonable_max = reasonable_min; 1503 } else { 1504 // Not-small physical memory, so require a heap at least 1505 // as large as MaxHeapSize 1506 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1507 } 1508 1509 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1510 // Limit the heap size to ErgoHeapSizeLimit 1511 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1512 } 1513 1514 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1515 1516 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1517 // An initial heap size was specified on the command line, 1518 // so be sure that the maximum size is consistent. Done 1519 // after call to limit_heap_by_allocatable_memory because that 1520 // method might reduce the allocation size. 1521 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1522 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1523 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1524 } 1525 1526 #ifdef _LP64 1527 if (UseCompressedOops || UseCompressedClassPointers) { 1528 // HeapBaseMinAddress can be greater than default but not less than. 1529 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1530 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1531 // matches compressed oops printing flags 1532 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 1533 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 1534 DefaultHeapBaseMinAddress, 1535 DefaultHeapBaseMinAddress/G, 1536 HeapBaseMinAddress); 1537 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1538 } 1539 } 1540 } 1541 if (UseCompressedOops) { 1542 // Limit the heap size to the maximum possible when using compressed oops 1543 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1544 1545 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1546 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1547 // but it should be not less than default MaxHeapSize. 1548 max_coop_heap -= HeapBaseMinAddress; 1549 } 1550 1551 // If user specified flags prioritizing os physical 1552 // memory limits, then disable compressed oops if 1553 // limits exceed max_coop_heap and UseCompressedOops 1554 // was not specified. 1555 if (reasonable_max > max_coop_heap) { 1556 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1557 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1558 " max heap " SIZE_FORMAT " > compressed oop heap " SIZE_FORMAT ". " 1559 "Please check the setting of MaxRAMPercentage %5.2f." 1560 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1561 FLAG_SET_ERGO(UseCompressedOops, false); 1562 } else { 1563 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1564 } 1565 } 1566 } 1567 #endif // _LP64 1568 1569 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 1570 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1571 } 1572 1573 // If the minimum or initial heap_size have not been set or requested to be set 1574 // ergonomically, set them accordingly. 1575 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1576 julong reasonable_minimum = (julong)(OldSize + NewSize); 1577 1578 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1579 1580 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1581 1582 if (InitialHeapSize == 0) { 1583 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100); 1584 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1585 1586 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1587 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1588 1589 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1590 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, InitialHeapSize); 1591 } 1592 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1593 // synchronize with InitialHeapSize to avoid errors with the default value. 1594 if (MinHeapSize == 0) { 1595 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1596 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, MinHeapSize); 1597 } 1598 } 1599 } 1600 1601 // This option inspects the machine and attempts to set various 1602 // parameters to be optimal for long-running, memory allocation 1603 // intensive jobs. It is intended for machines with large 1604 // amounts of cpu and memory. 1605 jint Arguments::set_aggressive_heap_flags() { 1606 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1607 // VM, but we may not be able to represent the total physical memory 1608 // available (like having 8gb of memory on a box but using a 32bit VM). 1609 // Thus, we need to make sure we're using a julong for intermediate 1610 // calculations. 1611 julong initHeapSize; 1612 julong total_memory = os::physical_memory(); 1613 1614 if (total_memory < (julong) 256 * M) { 1615 jio_fprintf(defaultStream::error_stream(), 1616 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1617 vm_exit(1); 1618 } 1619 1620 // The heap size is half of available memory, or (at most) 1621 // all of possible memory less 160mb (leaving room for the OS 1622 // when using ISM). This is the maximum; because adaptive sizing 1623 // is turned on below, the actual space used may be smaller. 1624 1625 initHeapSize = MIN2(total_memory / (julong) 2, 1626 total_memory - (julong) 160 * M); 1627 1628 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1629 1630 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1631 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1632 return JNI_EINVAL; 1633 } 1634 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1635 return JNI_EINVAL; 1636 } 1637 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1638 return JNI_EINVAL; 1639 } 1640 } 1641 if (FLAG_IS_DEFAULT(NewSize)) { 1642 // Make the young generation 3/8ths of the total heap. 1643 if (FLAG_SET_CMDLINE(NewSize, 1644 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1645 return JNI_EINVAL; 1646 } 1647 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1648 return JNI_EINVAL; 1649 } 1650 } 1651 1652 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1653 FLAG_SET_DEFAULT(UseLargePages, true); 1654 #endif 1655 1656 // Increase some data structure sizes for efficiency 1657 if (FLAG_SET_CMDLINE(BaseFootPrintEstimate, MaxHeapSize) != JVMFlag::SUCCESS) { 1658 return JNI_EINVAL; 1659 } 1660 if (FLAG_SET_CMDLINE(ResizeTLAB, false) != JVMFlag::SUCCESS) { 1661 return JNI_EINVAL; 1662 } 1663 if (FLAG_SET_CMDLINE(TLABSize, 256 * K) != JVMFlag::SUCCESS) { 1664 return JNI_EINVAL; 1665 } 1666 1667 // See the OldPLABSize comment below, but replace 'after promotion' 1668 // with 'after copying'. YoungPLABSize is the size of the survivor 1669 // space per-gc-thread buffers. The default is 4kw. 1670 if (FLAG_SET_CMDLINE(YoungPLABSize, 256 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1671 return JNI_EINVAL; 1672 } 1673 1674 // OldPLABSize is the size of the buffers in the old gen that 1675 // UseParallelGC uses to promote live data that doesn't fit in the 1676 // survivor spaces. At any given time, there's one for each gc thread. 1677 // The default size is 1kw. These buffers are rarely used, since the 1678 // survivor spaces are usually big enough. For specjbb, however, there 1679 // are occasions when there's lots of live data in the young gen 1680 // and we end up promoting some of it. We don't have a definite 1681 // explanation for why bumping OldPLABSize helps, but the theory 1682 // is that a bigger PLAB results in retaining something like the 1683 // original allocation order after promotion, which improves mutator 1684 // locality. A minor effect may be that larger PLABs reduce the 1685 // number of PLAB allocation events during gc. The value of 8kw 1686 // was arrived at by experimenting with specjbb. 1687 if (FLAG_SET_CMDLINE(OldPLABSize, 8 * K) != JVMFlag::SUCCESS) { // Note: this is in words 1688 return JNI_EINVAL; 1689 } 1690 1691 // Enable parallel GC and adaptive generation sizing 1692 if (FLAG_SET_CMDLINE(UseParallelGC, true) != JVMFlag::SUCCESS) { 1693 return JNI_EINVAL; 1694 } 1695 1696 // Encourage steady state memory management 1697 if (FLAG_SET_CMDLINE(ThresholdTolerance, 100) != JVMFlag::SUCCESS) { 1698 return JNI_EINVAL; 1699 } 1700 1701 return JNI_OK; 1702 } 1703 1704 // This must be called after ergonomics. 1705 void Arguments::set_bytecode_flags() { 1706 if (!RewriteBytecodes) { 1707 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 1708 } 1709 } 1710 1711 // Aggressive optimization flags 1712 jint Arguments::set_aggressive_opts_flags() { 1713 #ifdef COMPILER2 1714 if (AggressiveUnboxing) { 1715 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1716 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1717 } else if (!EliminateAutoBox) { 1718 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 1719 AggressiveUnboxing = false; 1720 } 1721 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 1722 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 1723 } else if (!DoEscapeAnalysis) { 1724 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 1725 AggressiveUnboxing = false; 1726 } 1727 } 1728 if (!FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 1729 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 1730 FLAG_SET_DEFAULT(EliminateAutoBox, true); 1731 } 1732 // Feed the cache size setting into the JDK 1733 char buffer[1024]; 1734 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 1735 if (!add_property(buffer)) { 1736 return JNI_ENOMEM; 1737 } 1738 } 1739 #endif 1740 1741 return JNI_OK; 1742 } 1743 1744 //=========================================================================================================== 1745 1746 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 1747 if (_sun_java_launcher != _default_java_launcher) { 1748 os::free(const_cast<char*>(_sun_java_launcher)); 1749 } 1750 _sun_java_launcher = os::strdup_check_oom(launcher); 1751 } 1752 1753 bool Arguments::created_by_java_launcher() { 1754 assert(_sun_java_launcher != nullptr, "property must have value"); 1755 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 1756 } 1757 1758 bool Arguments::sun_java_launcher_is_altjvm() { 1759 return _sun_java_launcher_is_altjvm; 1760 } 1761 1762 //=========================================================================================================== 1763 // Parsing of main arguments 1764 1765 unsigned int addreads_count = 0; 1766 unsigned int addexports_count = 0; 1767 unsigned int addopens_count = 0; 1768 unsigned int addmods_count = 0; 1769 unsigned int patch_mod_count = 0; 1770 unsigned int enable_native_access_count = 0; 1771 1772 // Check the consistency of vm_init_args 1773 bool Arguments::check_vm_args_consistency() { 1774 // Method for adding checks for flag consistency. 1775 // The intent is to warn the user of all possible conflicts, 1776 // before returning an error. 1777 // Note: Needs platform-dependent factoring. 1778 bool status = true; 1779 1780 if (TLABRefillWasteFraction == 0) { 1781 jio_fprintf(defaultStream::error_stream(), 1782 "TLABRefillWasteFraction should be a denominator, " 1783 "not " SIZE_FORMAT "\n", 1784 TLABRefillWasteFraction); 1785 status = false; 1786 } 1787 1788 status = CompilerConfig::check_args_consistency(status); 1789 #if INCLUDE_JVMCI 1790 if (status && EnableJVMCI) { 1791 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 1792 AddProperty, UnwriteableProperty, InternalProperty); 1793 /* 1794 * Ioi - 2023/05/19. There's no need for this with my patch-jdk.sh script, which adds 1795 * jdk.internal.vm.ci as one of the default modules. Using -Djdk.module.addmods will 1796 * cause the full module graph to be disabled and slow down performance. 1797 */ 1798 if (!TempDisableAddJVMCIModule && ClassLoader::is_module_observable("jdk.internal.vm.ci")) { 1799 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 1800 return false; 1801 } 1802 } 1803 } 1804 #endif 1805 1806 #if INCLUDE_JFR 1807 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1808 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", addmods_count++)) { 1809 return false; 1810 } 1811 } 1812 #endif 1813 1814 #ifndef SUPPORT_RESERVED_STACK_AREA 1815 if (StackReservedPages != 0) { 1816 FLAG_SET_CMDLINE(StackReservedPages, 0); 1817 warning("Reserved Stack Area not supported on this platform"); 1818 } 1819 #endif 1820 1821 #if !defined(X86) && !defined(AARCH64) && !defined(RISCV64) && !defined(ARM) && !defined(PPC64) && !defined(S390) 1822 if (LockingMode == LM_LIGHTWEIGHT) { 1823 FLAG_SET_CMDLINE(LockingMode, LM_LEGACY); 1824 warning("New lightweight locking not supported on this platform"); 1825 } 1826 #endif 1827 1828 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390) 1829 if (LockingMode == LM_MONITOR) { 1830 jio_fprintf(defaultStream::error_stream(), 1831 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n"); 1832 return false; 1833 } 1834 #endif 1835 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) { 1836 jio_fprintf(defaultStream::error_stream(), 1837 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n"); 1838 return false; 1839 } 1840 return status; 1841 } 1842 1843 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1844 const char* option_type) { 1845 if (ignore) return false; 1846 1847 const char* spacer = " "; 1848 if (option_type == nullptr) { 1849 option_type = ++spacer; // Set both to the empty string. 1850 } 1851 1852 jio_fprintf(defaultStream::error_stream(), 1853 "Unrecognized %s%soption: %s\n", option_type, spacer, 1854 option->optionString); 1855 return true; 1856 } 1857 1858 static const char* user_assertion_options[] = { 1859 "-da", "-ea", "-disableassertions", "-enableassertions", 0 1860 }; 1861 1862 static const char* system_assertion_options[] = { 1863 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 1864 }; 1865 1866 bool Arguments::parse_uint(const char* value, 1867 uint* uint_arg, 1868 uint min_size) { 1869 uint n; 1870 if (!parse_integer(value, &n)) { 1871 return false; 1872 } 1873 if (n >= min_size) { 1874 *uint_arg = n; 1875 return true; 1876 } else { 1877 return false; 1878 } 1879 } 1880 1881 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 1882 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 1883 CDSConfig::check_internal_module_property(prop_name, prop_value); 1884 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 1885 char* property = AllocateHeap(prop_len, mtArguments); 1886 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 1887 if (ret < 0 || ret >= (int)prop_len) { 1888 FreeHeap(property); 1889 return false; 1890 } 1891 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 1892 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 1893 // that multiple occurrences of the associated flag just causes the existing property value to be 1894 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 1895 // to a property after we have finished flag processing. 1896 bool added = add_property(property, WriteableProperty, internal); 1897 FreeHeap(property); 1898 return added; 1899 } 1900 1901 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 1902 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 1903 CDSConfig::check_internal_module_property(prop_base_name, prop_value); 1904 const unsigned int props_count_limit = 1000; 1905 const int max_digits = 3; 1906 const int extra_symbols_count = 3; // includes '.', '=', '\0' 1907 1908 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 1909 if (count < props_count_limit) { 1910 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 1911 char* property = AllocateHeap(prop_len, mtArguments); 1912 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 1913 if (ret < 0 || ret >= (int)prop_len) { 1914 FreeHeap(property); 1915 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 1916 return false; 1917 } 1918 bool added = add_property(property, UnwriteableProperty, InternalProperty); 1919 FreeHeap(property); 1920 return added; 1921 } 1922 1923 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 1924 return false; 1925 } 1926 1927 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1928 julong* long_arg, 1929 julong min_size, 1930 julong max_size) { 1931 if (!parse_integer(s, long_arg)) return arg_unreadable; 1932 return check_memory_size(*long_arg, min_size, max_size); 1933 } 1934 1935 // Parse JavaVMInitArgs structure 1936 1937 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 1938 const JavaVMInitArgs *java_tool_options_args, 1939 const JavaVMInitArgs *java_options_args, 1940 const JavaVMInitArgs *cmd_line_args) { 1941 bool patch_mod_javabase = false; 1942 1943 // Save default settings for some mode flags 1944 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1945 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1946 Arguments::_ClipInlining = ClipInlining; 1947 Arguments::_BackgroundCompilation = BackgroundCompilation; 1948 1949 // Remember the default value of SharedBaseAddress. 1950 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 1951 1952 // Setup flags for mixed which is the default 1953 set_mode_flags(_mixed); 1954 1955 // Parse args structure generated from java.base vm options resource 1956 jint result = parse_each_vm_init_arg(vm_options_args, &patch_mod_javabase, JVMFlagOrigin::JIMAGE_RESOURCE); 1957 if (result != JNI_OK) { 1958 return result; 1959 } 1960 1961 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 1962 // variable (if present). 1963 result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 1964 if (result != JNI_OK) { 1965 return result; 1966 } 1967 1968 // Parse args structure generated from the command line flags. 1969 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, JVMFlagOrigin::COMMAND_LINE); 1970 if (result != JNI_OK) { 1971 return result; 1972 } 1973 1974 // Parse args structure generated from the _JAVA_OPTIONS environment 1975 // variable (if present) (mimics classic VM) 1976 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, JVMFlagOrigin::ENVIRON_VAR); 1977 if (result != JNI_OK) { 1978 return result; 1979 } 1980 1981 // Disable CDS for exploded image 1982 if (!has_jimage()) { 1983 no_shared_spaces("CDS disabled on exploded JDK"); 1984 } 1985 1986 // We need to ensure processor and memory resources have been properly 1987 // configured - which may rely on arguments we just processed - before 1988 // doing the final argument processing. Any argument processing that 1989 // needs to know about processor and memory resources must occur after 1990 // this point. 1991 1992 os::init_container_support(); 1993 1994 SystemMemoryBarrier::initialize(); 1995 1996 // Do final processing now that all arguments have been parsed 1997 result = finalize_vm_init_args(patch_mod_javabase); 1998 if (result != JNI_OK) { 1999 return result; 2000 } 2001 2002 return JNI_OK; 2003 } 2004 2005 #if !INCLUDE_JVMTI 2006 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2007 // represents a valid JDWP agent. is_path==true denotes that we 2008 // are dealing with -agentpath (case where name is a path), otherwise with 2009 // -agentlib 2010 static bool valid_jdwp_agent(char *name, bool is_path) { 2011 char *_name; 2012 const char *_jdwp = "jdwp"; 2013 size_t _len_jdwp, _len_prefix; 2014 2015 if (is_path) { 2016 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) { 2017 return false; 2018 } 2019 2020 _name++; // skip past last path separator 2021 _len_prefix = strlen(JNI_LIB_PREFIX); 2022 2023 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2024 return false; 2025 } 2026 2027 _name += _len_prefix; 2028 _len_jdwp = strlen(_jdwp); 2029 2030 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2031 _name += _len_jdwp; 2032 } 2033 else { 2034 return false; 2035 } 2036 2037 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2038 return false; 2039 } 2040 2041 return true; 2042 } 2043 2044 if (strcmp(name, _jdwp) == 0) { 2045 return true; 2046 } 2047 2048 return false; 2049 } 2050 #endif 2051 2052 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2053 // --patch-module=<module>=<file>(<pathsep><file>)* 2054 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value"); 2055 // Find the equal sign between the module name and the path specification 2056 const char* module_equal = strchr(patch_mod_tail, '='); 2057 if (module_equal == nullptr) { 2058 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2059 return JNI_ERR; 2060 } else { 2061 // Pick out the module name 2062 size_t module_len = module_equal - patch_mod_tail; 2063 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2064 if (module_name != nullptr) { 2065 memcpy(module_name, patch_mod_tail, module_len); 2066 *(module_name + module_len) = '\0'; 2067 // The path piece begins one past the module_equal sign 2068 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2069 FREE_C_HEAP_ARRAY(char, module_name); 2070 if (!create_numbered_module_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2071 return JNI_ENOMEM; 2072 } 2073 } else { 2074 return JNI_ENOMEM; 2075 } 2076 } 2077 return JNI_OK; 2078 } 2079 2080 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2081 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2082 // The min and max sizes match the values in globals.hpp, but scaled 2083 // with K. The values have been chosen so that alignment with page 2084 // size doesn't change the max value, which makes the conversions 2085 // back and forth between Xss value and ThreadStackSize value easier. 2086 // The values have also been chosen to fit inside a 32-bit signed type. 2087 const julong min_ThreadStackSize = 0; 2088 const julong max_ThreadStackSize = 1 * M; 2089 2090 // Make sure the above values match the range set in globals.hpp 2091 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2092 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2093 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2094 2095 const julong min_size = min_ThreadStackSize * K; 2096 const julong max_size = max_ThreadStackSize * K; 2097 2098 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2099 2100 julong size = 0; 2101 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2102 if (errcode != arg_in_range) { 2103 bool silent = (option == nullptr); // Allow testing to silence error messages 2104 if (!silent) { 2105 jio_fprintf(defaultStream::error_stream(), 2106 "Invalid thread stack size: %s\n", option->optionString); 2107 describe_range_error(errcode); 2108 } 2109 return JNI_EINVAL; 2110 } 2111 2112 // Internally track ThreadStackSize in units of 1024 bytes. 2113 const julong size_aligned = align_up(size, K); 2114 assert(size <= size_aligned, 2115 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2116 size, size_aligned); 2117 2118 const julong size_in_K = size_aligned / K; 2119 assert(size_in_K < (julong)max_intx, 2120 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2121 size_in_K); 2122 2123 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2124 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2125 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2126 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2127 max_expanded, size_in_K); 2128 2129 *out_ThreadStackSize = (intx)size_in_K; 2130 2131 return JNI_OK; 2132 } 2133 2134 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, JVMFlagOrigin origin) { 2135 // For match_option to return remaining or value part of option string 2136 const char* tail; 2137 2138 // iterate over arguments 2139 for (int index = 0; index < args->nOptions; index++) { 2140 bool is_absolute_path = false; // for -agentpath vs -agentlib 2141 2142 const JavaVMOption* option = args->options + index; 2143 2144 if (!match_option(option, "-Djava.class.path", &tail) && 2145 !match_option(option, "-Dsun.java.command", &tail) && 2146 !match_option(option, "-Dsun.java.launcher", &tail)) { 2147 2148 // add all jvm options to the jvm_args string. This string 2149 // is used later to set the java.vm.args PerfData string constant. 2150 // the -Djava.class.path and the -Dsun.java.command options are 2151 // omitted from jvm_args string as each have their own PerfData 2152 // string constant object. 2153 build_jvm_args(option->optionString); 2154 } 2155 2156 // -verbose:[class/module/gc/jni] 2157 if (match_option(option, "-verbose", &tail)) { 2158 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2159 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2160 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2161 } else if (!strcmp(tail, ":module")) { 2162 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2163 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2164 } else if (!strcmp(tail, ":gc")) { 2165 if (_legacyGCLogging.lastFlag == 0) { 2166 _legacyGCLogging.lastFlag = 1; 2167 } 2168 } else if (!strcmp(tail, ":jni")) { 2169 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2170 } 2171 // -da / -ea / -disableassertions / -enableassertions 2172 // These accept an optional class/package name separated by a colon, e.g., 2173 // -da:java.lang.Thread. 2174 } else if (match_option(option, user_assertion_options, &tail, true)) { 2175 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2176 if (*tail == '\0') { 2177 JavaAssertions::setUserClassDefault(enable); 2178 } else { 2179 assert(*tail == ':', "bogus match by match_option()"); 2180 JavaAssertions::addOption(tail + 1, enable); 2181 } 2182 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2183 } else if (match_option(option, system_assertion_options, &tail, false)) { 2184 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2185 JavaAssertions::setSystemClassDefault(enable); 2186 // -bootclasspath: 2187 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2188 jio_fprintf(defaultStream::output_stream(), 2189 "-Xbootclasspath is no longer a supported option.\n"); 2190 return JNI_EINVAL; 2191 // -bootclasspath/a: 2192 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2193 Arguments::append_sysclasspath(tail); 2194 // -bootclasspath/p: 2195 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2196 jio_fprintf(defaultStream::output_stream(), 2197 "-Xbootclasspath/p is no longer a supported option.\n"); 2198 return JNI_EINVAL; 2199 // -Xrun 2200 } else if (match_option(option, "-Xrun", &tail)) { 2201 if (tail != nullptr) { 2202 const char* pos = strchr(tail, ':'); 2203 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail; 2204 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2205 jio_snprintf(name, len + 1, "%s", tail); 2206 2207 char *options = nullptr; 2208 if(pos != nullptr) { 2209 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2210 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2211 } 2212 #if !INCLUDE_JVMTI 2213 if (strcmp(name, "jdwp") == 0) { 2214 jio_fprintf(defaultStream::error_stream(), 2215 "Debugging agents are not supported in this VM\n"); 2216 return JNI_ERR; 2217 } 2218 #endif // !INCLUDE_JVMTI 2219 JvmtiAgentList::add_xrun(name, options, false); 2220 FREE_C_HEAP_ARRAY(char, name); 2221 FREE_C_HEAP_ARRAY(char, options); 2222 } 2223 } else if (match_option(option, "--add-reads=", &tail)) { 2224 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2225 return JNI_ENOMEM; 2226 } 2227 } else if (match_option(option, "--add-exports=", &tail)) { 2228 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2229 return JNI_ENOMEM; 2230 } 2231 } else if (match_option(option, "--add-opens=", &tail)) { 2232 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2233 return JNI_ENOMEM; 2234 } 2235 } else if (match_option(option, "--add-modules=", &tail)) { 2236 if (!create_numbered_module_property("jdk.module.addmods", tail, addmods_count++)) { 2237 return JNI_ENOMEM; 2238 } 2239 } else if (match_option(option, "--enable-native-access=", &tail)) { 2240 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2241 return JNI_ENOMEM; 2242 } 2243 } else if (match_option(option, "--limit-modules=", &tail)) { 2244 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2245 return JNI_ENOMEM; 2246 } 2247 } else if (match_option(option, "--module-path=", &tail)) { 2248 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2249 return JNI_ENOMEM; 2250 } 2251 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2252 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2253 return JNI_ENOMEM; 2254 } 2255 } else if (match_option(option, "--patch-module=", &tail)) { 2256 // --patch-module=<module>=<file>(<pathsep><file>)* 2257 int res = process_patch_mod_option(tail, patch_mod_javabase); 2258 if (res != JNI_OK) { 2259 return res; 2260 } 2261 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) { 2262 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) { 2263 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail, 2264 AddProperty, WriteableProperty, InternalProperty); 2265 } else { 2266 jio_fprintf(defaultStream::error_stream(), 2267 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail); 2268 return JNI_ERR; 2269 } 2270 } else if (match_option(option, "--illegal-access=", &tail)) { 2271 char version[256]; 2272 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2273 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2274 // -agentlib and -agentpath 2275 } else if (match_option(option, "-agentlib:", &tail) || 2276 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2277 if(tail != nullptr) { 2278 const char* pos = strchr(tail, '='); 2279 char* name; 2280 if (pos == nullptr) { 2281 name = os::strdup_check_oom(tail, mtArguments); 2282 } else { 2283 size_t len = pos - tail; 2284 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2285 memcpy(name, tail, len); 2286 name[len] = '\0'; 2287 } 2288 2289 char *options = nullptr; 2290 if(pos != nullptr) { 2291 options = os::strdup_check_oom(pos + 1, mtArguments); 2292 } 2293 #if !INCLUDE_JVMTI 2294 if (valid_jdwp_agent(name, is_absolute_path)) { 2295 jio_fprintf(defaultStream::error_stream(), 2296 "Debugging agents are not supported in this VM\n"); 2297 return JNI_ERR; 2298 } 2299 #endif // !INCLUDE_JVMTI 2300 JvmtiAgentList::add(name, options, is_absolute_path); 2301 os::free(name); 2302 os::free(options); 2303 } 2304 // -javaagent 2305 } else if (match_option(option, "-javaagent:", &tail)) { 2306 #if !INCLUDE_JVMTI 2307 jio_fprintf(defaultStream::error_stream(), 2308 "Instrumentation agents are not supported in this VM\n"); 2309 return JNI_ERR; 2310 #else 2311 if (tail != nullptr) { 2312 size_t length = strlen(tail) + 1; 2313 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2314 jio_snprintf(options, length, "%s", tail); 2315 JvmtiAgentList::add("instrument", options, false); 2316 FREE_C_HEAP_ARRAY(char, options); 2317 2318 // java agents need module java.instrument 2319 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2320 return JNI_ENOMEM; 2321 } 2322 } 2323 #endif // !INCLUDE_JVMTI 2324 // --enable_preview 2325 } else if (match_option(option, "--enable-preview")) { 2326 set_enable_preview(); 2327 // -Xnoclassgc 2328 } else if (match_option(option, "-Xnoclassgc")) { 2329 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2330 return JNI_EINVAL; 2331 } 2332 // -Xbatch 2333 } else if (match_option(option, "-Xbatch")) { 2334 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2335 return JNI_EINVAL; 2336 } 2337 // -Xmn for compatibility with other JVM vendors 2338 } else if (match_option(option, "-Xmn", &tail)) { 2339 julong long_initial_young_size = 0; 2340 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2341 if (errcode != arg_in_range) { 2342 jio_fprintf(defaultStream::error_stream(), 2343 "Invalid initial young generation size: %s\n", option->optionString); 2344 describe_range_error(errcode); 2345 return JNI_EINVAL; 2346 } 2347 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2348 return JNI_EINVAL; 2349 } 2350 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2351 return JNI_EINVAL; 2352 } 2353 // -Xms 2354 } else if (match_option(option, "-Xms", &tail)) { 2355 julong size = 0; 2356 // an initial heap size of 0 means automatically determine 2357 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2358 if (errcode != arg_in_range) { 2359 jio_fprintf(defaultStream::error_stream(), 2360 "Invalid initial heap size: %s\n", option->optionString); 2361 describe_range_error(errcode); 2362 return JNI_EINVAL; 2363 } 2364 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2365 return JNI_EINVAL; 2366 } 2367 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2368 return JNI_EINVAL; 2369 } 2370 // -Xmx 2371 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2372 julong long_max_heap_size = 0; 2373 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2374 if (errcode != arg_in_range) { 2375 jio_fprintf(defaultStream::error_stream(), 2376 "Invalid maximum heap size: %s\n", option->optionString); 2377 describe_range_error(errcode); 2378 return JNI_EINVAL; 2379 } 2380 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2381 return JNI_EINVAL; 2382 } 2383 // Xmaxf 2384 } else if (match_option(option, "-Xmaxf", &tail)) { 2385 char* err; 2386 int maxf = (int)(strtod(tail, &err) * 100); 2387 if (*err != '\0' || *tail == '\0') { 2388 jio_fprintf(defaultStream::error_stream(), 2389 "Bad max heap free percentage size: %s\n", 2390 option->optionString); 2391 return JNI_EINVAL; 2392 } else { 2393 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2394 return JNI_EINVAL; 2395 } 2396 } 2397 // Xminf 2398 } else if (match_option(option, "-Xminf", &tail)) { 2399 char* err; 2400 int minf = (int)(strtod(tail, &err) * 100); 2401 if (*err != '\0' || *tail == '\0') { 2402 jio_fprintf(defaultStream::error_stream(), 2403 "Bad min heap free percentage size: %s\n", 2404 option->optionString); 2405 return JNI_EINVAL; 2406 } else { 2407 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2408 return JNI_EINVAL; 2409 } 2410 } 2411 // -Xss 2412 } else if (match_option(option, "-Xss", &tail)) { 2413 intx value = 0; 2414 jint err = parse_xss(option, tail, &value); 2415 if (err != JNI_OK) { 2416 return err; 2417 } 2418 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2419 return JNI_EINVAL; 2420 } 2421 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2422 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2423 julong long_ReservedCodeCacheSize = 0; 2424 2425 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2426 if (errcode != arg_in_range) { 2427 jio_fprintf(defaultStream::error_stream(), 2428 "Invalid maximum code cache size: %s.\n", option->optionString); 2429 return JNI_EINVAL; 2430 } 2431 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2432 return JNI_EINVAL; 2433 } 2434 // -green 2435 } else if (match_option(option, "-green")) { 2436 jio_fprintf(defaultStream::error_stream(), 2437 "Green threads support not available\n"); 2438 return JNI_EINVAL; 2439 // -native 2440 } else if (match_option(option, "-native")) { 2441 // HotSpot always uses native threads, ignore silently for compatibility 2442 // -Xrs 2443 } else if (match_option(option, "-Xrs")) { 2444 // Classic/EVM option, new functionality 2445 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2446 return JNI_EINVAL; 2447 } 2448 // -Xprof 2449 } else if (match_option(option, "-Xprof")) { 2450 char version[256]; 2451 // Obsolete in JDK 10 2452 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2453 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2454 // -Xinternalversion 2455 } else if (match_option(option, "-Xinternalversion")) { 2456 jio_fprintf(defaultStream::output_stream(), "%s\n", 2457 VM_Version::internal_vm_info_string()); 2458 vm_exit(0); 2459 #ifndef PRODUCT 2460 // -Xprintflags 2461 } else if (match_option(option, "-Xprintflags")) { 2462 JVMFlag::printFlags(tty, false); 2463 vm_exit(0); 2464 #endif 2465 // -D 2466 } else if (match_option(option, "-D", &tail)) { 2467 const char* value; 2468 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2469 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2470 // abort if -Djava.endorsed.dirs is set 2471 jio_fprintf(defaultStream::output_stream(), 2472 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2473 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2474 return JNI_EINVAL; 2475 } 2476 if (match_option(option, "-Djava.ext.dirs=", &value) && 2477 *value != '\0' && strcmp(value, "\"\"") != 0) { 2478 // abort if -Djava.ext.dirs is set 2479 jio_fprintf(defaultStream::output_stream(), 2480 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2481 return JNI_EINVAL; 2482 } 2483 // Check for module related properties. They must be set using the modules 2484 // options. For example: use "--add-modules=java.sql", not 2485 // "-Djdk.module.addmods=java.sql" 2486 if (is_internal_module_property(option->optionString + 2)) { 2487 needs_module_property_warning = true; 2488 continue; 2489 } 2490 if (!add_property(tail)) { 2491 return JNI_ENOMEM; 2492 } 2493 // Out of the box management support 2494 if (match_option(option, "-Dcom.sun.management", &tail)) { 2495 #if INCLUDE_MANAGEMENT 2496 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2497 return JNI_EINVAL; 2498 } 2499 // management agent in module jdk.management.agent 2500 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 2501 return JNI_ENOMEM; 2502 } 2503 #else 2504 jio_fprintf(defaultStream::output_stream(), 2505 "-Dcom.sun.management is not supported in this VM.\n"); 2506 return JNI_ERR; 2507 #endif 2508 } 2509 // -Xint 2510 } else if (match_option(option, "-Xint")) { 2511 set_mode_flags(_int); 2512 mode_flag_cmd_line = true; 2513 // -Xmixed 2514 } else if (match_option(option, "-Xmixed")) { 2515 set_mode_flags(_mixed); 2516 mode_flag_cmd_line = true; 2517 // -Xcomp 2518 } else if (match_option(option, "-Xcomp")) { 2519 // for testing the compiler; turn off all flags that inhibit compilation 2520 set_mode_flags(_comp); 2521 mode_flag_cmd_line = true; 2522 // -Xshare:dump 2523 } else if (match_option(option, "-Xshare:dump")) { 2524 CDSConfig::enable_dumping_static_archive(); 2525 CDSConfig::set_old_cds_flags_used(); 2526 // -Xshare:on 2527 } else if (match_option(option, "-Xshare:on")) { 2528 UseSharedSpaces = true; 2529 RequireSharedSpaces = true; 2530 CDSConfig::set_old_cds_flags_used(); 2531 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2532 } else if (match_option(option, "-Xshare:auto")) { 2533 UseSharedSpaces = true; 2534 RequireSharedSpaces = false; 2535 xshare_auto_cmd_line = true; 2536 CDSConfig::set_old_cds_flags_used(); 2537 // -Xshare:off 2538 } else if (match_option(option, "-Xshare:off")) { 2539 UseSharedSpaces = false; 2540 RequireSharedSpaces = false; 2541 CDSConfig::set_old_cds_flags_used(); 2542 // -Xverify 2543 } else if (match_option(option, "-Xverify", &tail)) { 2544 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2545 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2546 return JNI_EINVAL; 2547 } 2548 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2549 return JNI_EINVAL; 2550 } 2551 } else if (strcmp(tail, ":remote") == 0) { 2552 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2553 return JNI_EINVAL; 2554 } 2555 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2556 return JNI_EINVAL; 2557 } 2558 } else if (strcmp(tail, ":none") == 0) { 2559 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2560 return JNI_EINVAL; 2561 } 2562 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2563 return JNI_EINVAL; 2564 } 2565 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2566 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2567 return JNI_EINVAL; 2568 } 2569 // -Xdebug 2570 } else if (match_option(option, "-Xdebug")) { 2571 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release."); 2572 } else if (match_option(option, "-Xloggc:", &tail)) { 2573 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2574 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2575 _legacyGCLogging.lastFlag = 2; 2576 _legacyGCLogging.file = os::strdup_check_oom(tail); 2577 } else if (match_option(option, "-Xlog", &tail)) { 2578 bool ret = false; 2579 if (strcmp(tail, ":help") == 0) { 2580 fileStream stream(defaultStream::output_stream()); 2581 LogConfiguration::print_command_line_help(&stream); 2582 vm_exit(0); 2583 } else if (strcmp(tail, ":disable") == 0) { 2584 LogConfiguration::disable_logging(); 2585 ret = true; 2586 } else if (strcmp(tail, ":async") == 0) { 2587 LogConfiguration::set_async_mode(true); 2588 ret = true; 2589 } else if (*tail == '\0') { 2590 ret = LogConfiguration::parse_command_line_arguments(); 2591 assert(ret, "-Xlog without arguments should never fail to parse"); 2592 } else if (*tail == ':') { 2593 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2594 } 2595 if (ret == false) { 2596 jio_fprintf(defaultStream::error_stream(), 2597 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2598 tail); 2599 return JNI_EINVAL; 2600 } 2601 // JNI hooks 2602 } else if (match_option(option, "-Xcheck", &tail)) { 2603 if (!strcmp(tail, ":jni")) { 2604 #if !INCLUDE_JNI_CHECK 2605 warning("JNI CHECKING is not supported in this VM"); 2606 #else 2607 CheckJNICalls = true; 2608 #endif // INCLUDE_JNI_CHECK 2609 } else if (is_bad_option(option, args->ignoreUnrecognized, 2610 "check")) { 2611 return JNI_EINVAL; 2612 } 2613 } else if (match_option(option, "vfprintf")) { 2614 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2615 } else if (match_option(option, "exit")) { 2616 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2617 } else if (match_option(option, "abort")) { 2618 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2619 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2620 // and the last option wins. 2621 } else if (match_option(option, "-XX:+NeverTenure")) { 2622 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2623 return JNI_EINVAL; 2624 } 2625 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2626 return JNI_EINVAL; 2627 } 2628 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2629 return JNI_EINVAL; 2630 } 2631 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2632 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2633 return JNI_EINVAL; 2634 } 2635 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2636 return JNI_EINVAL; 2637 } 2638 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2639 return JNI_EINVAL; 2640 } 2641 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2642 uint max_tenuring_thresh = 0; 2643 if (!parse_uint(tail, &max_tenuring_thresh, 0)) { 2644 jio_fprintf(defaultStream::error_stream(), 2645 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2646 return JNI_EINVAL; 2647 } 2648 2649 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2650 return JNI_EINVAL; 2651 } 2652 2653 if (MaxTenuringThreshold == 0) { 2654 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2655 return JNI_EINVAL; 2656 } 2657 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2658 return JNI_EINVAL; 2659 } 2660 } else { 2661 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2662 return JNI_EINVAL; 2663 } 2664 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2665 return JNI_EINVAL; 2666 } 2667 } 2668 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2669 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2670 return JNI_EINVAL; 2671 } 2672 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2673 return JNI_EINVAL; 2674 } 2675 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2676 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2677 return JNI_EINVAL; 2678 } 2679 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2680 return JNI_EINVAL; 2681 } 2682 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2683 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2684 return JNI_EINVAL; 2685 } 2686 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2687 return JNI_EINVAL; 2688 } 2689 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2690 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2691 return JNI_EINVAL; 2692 } 2693 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2694 return JNI_EINVAL; 2695 } 2696 } else if (match_option(option, "--finalization=", &tail)) { 2697 if (strcmp(tail, "enabled") == 0) { 2698 InstanceKlass::set_finalization_enabled(true); 2699 } else if (strcmp(tail, "disabled") == 0) { 2700 InstanceKlass::set_finalization_enabled(false); 2701 } else { 2702 jio_fprintf(defaultStream::error_stream(), 2703 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2704 tail); 2705 return JNI_EINVAL; 2706 } 2707 #if !defined(DTRACE_ENABLED) 2708 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2709 jio_fprintf(defaultStream::error_stream(), 2710 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2711 return JNI_EINVAL; 2712 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2713 jio_fprintf(defaultStream::error_stream(), 2714 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2715 return JNI_EINVAL; 2716 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2717 jio_fprintf(defaultStream::error_stream(), 2718 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2719 return JNI_EINVAL; 2720 #endif // !defined(DTRACE_ENABLED) 2721 #ifdef ASSERT 2722 } else if (match_option(option, "-XX:+FullGCALot")) { 2723 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2724 return JNI_EINVAL; 2725 } 2726 #endif 2727 #if !INCLUDE_MANAGEMENT 2728 } else if (match_option(option, "-XX:+ManagementServer")) { 2729 jio_fprintf(defaultStream::error_stream(), 2730 "ManagementServer is not supported in this VM.\n"); 2731 return JNI_ERR; 2732 #endif // INCLUDE_MANAGEMENT 2733 #if INCLUDE_JVMCI 2734 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) { 2735 if (EnableJVMCIProduct) { 2736 jio_fprintf(defaultStream::error_stream(), 2737 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n"); 2738 return JNI_EINVAL; 2739 } 2740 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) { 2741 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT"); 2742 if (use_graal_jit) { 2743 const char* jvmci_compiler = get_property("jvmci.Compiler"); 2744 if (jvmci_compiler != nullptr) { 2745 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) { 2746 jio_fprintf(defaultStream::error_stream(), 2747 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler); 2748 return JNI_ERR; 2749 } 2750 } else if (!add_property("jvmci.Compiler=graal")) { 2751 return JNI_ENOMEM; 2752 } 2753 } 2754 2755 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before 2756 if (EnableJVMCIProduct) { 2757 continue; 2758 } 2759 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2760 // Allow this flag if it has been unlocked. 2761 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) { 2762 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) { 2763 jio_fprintf(defaultStream::error_stream(), 2764 "Unable to enable JVMCI in product mode\n"); 2765 return JNI_ERR; 2766 } 2767 } 2768 // The flag was locked so process normally to report that error 2769 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2770 return JNI_EINVAL; 2771 } 2772 #endif // INCLUDE_JVMCI 2773 #if INCLUDE_JFR 2774 } else if (match_jfr_option(&option)) { 2775 return JNI_EINVAL; 2776 #endif 2777 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2778 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2779 // already been handled 2780 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2781 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2782 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2783 return JNI_EINVAL; 2784 } 2785 } 2786 // Unknown option 2787 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2788 return JNI_ERR; 2789 } 2790 } 2791 2792 // PrintSharedArchiveAndExit will turn on 2793 // -Xshare:on 2794 // -Xlog:class+path=info 2795 if (PrintSharedArchiveAndExit) { 2796 UseSharedSpaces = true; 2797 RequireSharedSpaces = true; 2798 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2799 } 2800 2801 fix_appclasspath(); 2802 2803 return JNI_OK; 2804 } 2805 2806 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 2807 // For java.base check for duplicate --patch-module options being specified on the command line. 2808 // This check is only required for java.base, all other duplicate module specifications 2809 // will be checked during module system initialization. The module system initialization 2810 // will throw an ExceptionInInitializerError if this situation occurs. 2811 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2812 if (*patch_mod_javabase) { 2813 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2814 } else { 2815 *patch_mod_javabase = true; 2816 } 2817 } 2818 2819 // Create GrowableArray lazily, only if --patch-module has been specified 2820 if (_patch_mod_prefix == nullptr) { 2821 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2822 } 2823 2824 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2825 } 2826 2827 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2828 // 2829 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2830 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2831 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2832 // path is treated as the current directory. 2833 // 2834 // This causes problems with CDS, which requires that all directories specified in the classpath 2835 // must be empty. In most cases, applications do NOT want to load classes from the current 2836 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2837 // scripts compatible with CDS. 2838 void Arguments::fix_appclasspath() { 2839 if (IgnoreEmptyClassPaths) { 2840 const char separator = *os::path_separator(); 2841 const char* src = _java_class_path->value(); 2842 2843 // skip over all the leading empty paths 2844 while (*src == separator) { 2845 src ++; 2846 } 2847 2848 char* copy = os::strdup_check_oom(src, mtArguments); 2849 2850 // trim all trailing empty paths 2851 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 2852 *tail = '\0'; 2853 } 2854 2855 char from[3] = {separator, separator, '\0'}; 2856 char to [2] = {separator, '\0'}; 2857 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 2858 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 2859 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 2860 } 2861 2862 _java_class_path->set_writeable_value(copy); 2863 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 2864 } 2865 } 2866 2867 jint Arguments::finalize_vm_init_args(bool patch_mod_javabase) { 2868 // check if the default lib/endorsed directory exists; if so, error 2869 char path[JVM_MAXPATHLEN]; 2870 const char* fileSep = os::file_separator(); 2871 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 2872 2873 DIR* dir = os::opendir(path); 2874 if (dir != nullptr) { 2875 jio_fprintf(defaultStream::output_stream(), 2876 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 2877 "in modular form will be supported via the concept of upgradeable modules.\n"); 2878 os::closedir(dir); 2879 return JNI_ERR; 2880 } 2881 2882 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 2883 dir = os::opendir(path); 2884 if (dir != nullptr) { 2885 jio_fprintf(defaultStream::output_stream(), 2886 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 2887 "Use -classpath instead.\n."); 2888 os::closedir(dir); 2889 return JNI_ERR; 2890 } 2891 2892 // This must be done after all arguments have been processed 2893 // and the container support has been initialized since AggressiveHeap 2894 // relies on the amount of total memory available. 2895 if (AggressiveHeap) { 2896 jint result = set_aggressive_heap_flags(); 2897 if (result != JNI_OK) { 2898 return result; 2899 } 2900 } 2901 2902 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 2903 // but like -Xint, leave compilation thresholds unaffected. 2904 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 2905 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 2906 set_mode_flags(_int); 2907 } 2908 2909 #ifdef ZERO 2910 // Zero always runs in interpreted mode 2911 set_mode_flags(_int); 2912 #endif 2913 2914 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 2915 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 2916 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 2917 } 2918 2919 #if !COMPILER2_OR_JVMCI 2920 // Don't degrade server performance for footprint 2921 if (FLAG_IS_DEFAULT(UseLargePages) && 2922 MaxHeapSize < LargePageHeapSizeThreshold) { 2923 // No need for large granularity pages w/small heaps. 2924 // Note that large pages are enabled/disabled for both the 2925 // Java heap and the code cache. 2926 FLAG_SET_DEFAULT(UseLargePages, false); 2927 } 2928 2929 UNSUPPORTED_OPTION(ProfileInterpreter); 2930 #endif 2931 2932 // Parse the CompilationMode flag 2933 if (!CompilationModeFlag::initialize()) { 2934 return JNI_ERR; 2935 } 2936 2937 if (!check_vm_args_consistency()) { 2938 return JNI_ERR; 2939 } 2940 2941 if (!CDSConfig::check_vm_args_consistency(patch_mod_javabase, mode_flag_cmd_line, xshare_auto_cmd_line)) { 2942 return JNI_ERR; 2943 } 2944 2945 if (StoreCachedCode) { 2946 FLAG_SET_ERGO_IF_DEFAULT(CachedCodeMaxSize, 512*M); 2947 } 2948 2949 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 2950 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 2951 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 2952 2953 return JNI_OK; 2954 } 2955 2956 // Helper class for controlling the lifetime of JavaVMInitArgs 2957 // objects. The contents of the JavaVMInitArgs are guaranteed to be 2958 // deleted on the destruction of the ScopedVMInitArgs object. 2959 class ScopedVMInitArgs : public StackObj { 2960 private: 2961 JavaVMInitArgs _args; 2962 char* _container_name; 2963 bool _is_set; 2964 char* _vm_options_file_arg; 2965 2966 public: 2967 ScopedVMInitArgs(const char *container_name) { 2968 _args.version = JNI_VERSION_1_2; 2969 _args.nOptions = 0; 2970 _args.options = nullptr; 2971 _args.ignoreUnrecognized = false; 2972 _container_name = (char *)container_name; 2973 _is_set = false; 2974 _vm_options_file_arg = nullptr; 2975 } 2976 2977 // Populates the JavaVMInitArgs object represented by this 2978 // ScopedVMInitArgs object with the arguments in options. The 2979 // allocated memory is deleted by the destructor. If this method 2980 // returns anything other than JNI_OK, then this object is in a 2981 // partially constructed state, and should be abandoned. 2982 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 2983 _is_set = true; 2984 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 2985 JavaVMOption, options->length(), mtArguments); 2986 if (options_arr == nullptr) { 2987 return JNI_ENOMEM; 2988 } 2989 _args.options = options_arr; 2990 2991 for (int i = 0; i < options->length(); i++) { 2992 options_arr[i] = options->at(i); 2993 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 2994 if (options_arr[i].optionString == nullptr) { 2995 // Rely on the destructor to do cleanup. 2996 _args.nOptions = i; 2997 return JNI_ENOMEM; 2998 } 2999 } 3000 3001 _args.nOptions = options->length(); 3002 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3003 return JNI_OK; 3004 } 3005 3006 JavaVMInitArgs* get() { return &_args; } 3007 char* container_name() { return _container_name; } 3008 bool is_set() { return _is_set; } 3009 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; } 3010 char* vm_options_file_arg() { return _vm_options_file_arg; } 3011 3012 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3013 if (_vm_options_file_arg != nullptr) { 3014 os::free(_vm_options_file_arg); 3015 } 3016 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3017 } 3018 3019 ~ScopedVMInitArgs() { 3020 if (_vm_options_file_arg != nullptr) { 3021 os::free(_vm_options_file_arg); 3022 } 3023 if (_args.options == nullptr) return; 3024 for (int i = 0; i < _args.nOptions; i++) { 3025 os::free(_args.options[i].optionString); 3026 } 3027 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3028 } 3029 3030 // Insert options into this option list, to replace option at 3031 // vm_options_file_pos (-XX:VMOptionsFile) 3032 jint insert(const JavaVMInitArgs* args, 3033 const JavaVMInitArgs* args_to_insert, 3034 const int vm_options_file_pos) { 3035 assert(_args.options == nullptr, "shouldn't be set yet"); 3036 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3037 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3038 3039 int length = args->nOptions + args_to_insert->nOptions - 1; 3040 // Construct new option array 3041 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3042 for (int i = 0; i < args->nOptions; i++) { 3043 if (i == vm_options_file_pos) { 3044 // insert the new options starting at the same place as the 3045 // -XX:VMOptionsFile option 3046 for (int j = 0; j < args_to_insert->nOptions; j++) { 3047 options.push(args_to_insert->options[j]); 3048 } 3049 } else { 3050 options.push(args->options[i]); 3051 } 3052 } 3053 // make into options array 3054 return set_args(&options); 3055 } 3056 }; 3057 3058 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3059 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3060 } 3061 3062 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3063 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3064 } 3065 3066 jint Arguments::parse_options_environment_variable(const char* name, 3067 ScopedVMInitArgs* vm_args) { 3068 char *buffer = ::getenv(name); 3069 3070 // Don't check this environment variable if user has special privileges 3071 // (e.g. unix su command). 3072 if (buffer == nullptr || os::have_special_privileges()) { 3073 return JNI_OK; 3074 } 3075 3076 if ((buffer = os::strdup(buffer)) == nullptr) { 3077 return JNI_ENOMEM; 3078 } 3079 3080 jio_fprintf(defaultStream::error_stream(), 3081 "Picked up %s: %s\n", name, buffer); 3082 3083 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3084 3085 os::free(buffer); 3086 return retcode; 3087 } 3088 3089 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3090 // read file into buffer 3091 int fd = ::open(file_name, O_RDONLY); 3092 if (fd < 0) { 3093 jio_fprintf(defaultStream::error_stream(), 3094 "Could not open options file '%s'\n", 3095 file_name); 3096 return JNI_ERR; 3097 } 3098 3099 struct stat stbuf; 3100 int retcode = os::stat(file_name, &stbuf); 3101 if (retcode != 0) { 3102 jio_fprintf(defaultStream::error_stream(), 3103 "Could not stat options file '%s'\n", 3104 file_name); 3105 ::close(fd); 3106 return JNI_ERR; 3107 } 3108 3109 if (stbuf.st_size == 0) { 3110 // tell caller there is no option data and that is ok 3111 ::close(fd); 3112 return JNI_OK; 3113 } 3114 3115 // '+ 1' for null termination even with max bytes 3116 size_t bytes_alloc = stbuf.st_size + 1; 3117 3118 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3119 if (nullptr == buf) { 3120 jio_fprintf(defaultStream::error_stream(), 3121 "Could not allocate read buffer for options file parse\n"); 3122 ::close(fd); 3123 return JNI_ENOMEM; 3124 } 3125 3126 memset(buf, 0, bytes_alloc); 3127 3128 // Fill buffer 3129 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3130 ::close(fd); 3131 if (bytes_read < 0) { 3132 FREE_C_HEAP_ARRAY(char, buf); 3133 jio_fprintf(defaultStream::error_stream(), 3134 "Could not read options file '%s'\n", file_name); 3135 return JNI_ERR; 3136 } 3137 3138 if (bytes_read == 0) { 3139 // tell caller there is no option data and that is ok 3140 FREE_C_HEAP_ARRAY(char, buf); 3141 return JNI_OK; 3142 } 3143 3144 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3145 3146 FREE_C_HEAP_ARRAY(char, buf); 3147 return retcode; 3148 } 3149 3150 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3151 // Construct option array 3152 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3153 3154 // some pointers to help with parsing 3155 char *buffer_end = buffer + buf_len; 3156 char *opt_hd = buffer; 3157 char *wrt = buffer; 3158 char *rd = buffer; 3159 3160 // parse all options 3161 while (rd < buffer_end) { 3162 // skip leading white space from the input string 3163 while (rd < buffer_end && isspace((unsigned char) *rd)) { 3164 rd++; 3165 } 3166 3167 if (rd >= buffer_end) { 3168 break; 3169 } 3170 3171 // Remember this is where we found the head of the token. 3172 opt_hd = wrt; 3173 3174 // Tokens are strings of non white space characters separated 3175 // by one or more white spaces. 3176 while (rd < buffer_end && !isspace((unsigned char) *rd)) { 3177 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3178 int quote = *rd; // matching quote to look for 3179 rd++; // don't copy open quote 3180 while (rd < buffer_end && *rd != quote) { 3181 // include everything (even spaces) 3182 // up until the close quote 3183 *wrt++ = *rd++; // copy to option string 3184 } 3185 3186 if (rd < buffer_end) { 3187 rd++; // don't copy close quote 3188 } else { 3189 // did not see closing quote 3190 jio_fprintf(defaultStream::error_stream(), 3191 "Unmatched quote in %s\n", name); 3192 return JNI_ERR; 3193 } 3194 } else { 3195 *wrt++ = *rd++; // copy to option string 3196 } 3197 } 3198 3199 // steal a white space character and set it to null 3200 *wrt++ = '\0'; 3201 // We now have a complete token 3202 3203 JavaVMOption option; 3204 option.optionString = opt_hd; 3205 option.extraInfo = nullptr; 3206 3207 options.append(option); // Fill in option 3208 3209 rd++; // Advance to next character 3210 } 3211 3212 // Fill out JavaVMInitArgs structure. 3213 return vm_args->set_args(&options); 3214 } 3215 3216 #ifndef PRODUCT 3217 // Determine whether LogVMOutput should be implicitly turned on. 3218 static bool use_vm_log() { 3219 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3220 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3221 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3222 PrintAssembly || TraceDeoptimization || 3223 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3224 return true; 3225 } 3226 3227 #ifdef COMPILER1 3228 if (PrintC1Statistics) { 3229 return true; 3230 } 3231 #endif // COMPILER1 3232 3233 #ifdef COMPILER2 3234 if (PrintOptoAssembly || PrintOptoStatistics) { 3235 return true; 3236 } 3237 #endif // COMPILER2 3238 3239 return false; 3240 } 3241 3242 #endif // PRODUCT 3243 3244 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3245 for (int index = 0; index < args->nOptions; index++) { 3246 const JavaVMOption* option = args->options + index; 3247 const char* tail; 3248 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3249 return true; 3250 } 3251 } 3252 return false; 3253 } 3254 3255 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3256 const char* vm_options_file, 3257 const int vm_options_file_pos, 3258 ScopedVMInitArgs* vm_options_file_args, 3259 ScopedVMInitArgs* args_out) { 3260 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3261 if (code != JNI_OK) { 3262 return code; 3263 } 3264 3265 if (vm_options_file_args->get()->nOptions < 1) { 3266 return JNI_OK; 3267 } 3268 3269 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3270 jio_fprintf(defaultStream::error_stream(), 3271 "A VM options file may not refer to a VM options file. " 3272 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3273 "options file '%s' in options container '%s' is an error.\n", 3274 vm_options_file_args->vm_options_file_arg(), 3275 vm_options_file_args->container_name()); 3276 return JNI_EINVAL; 3277 } 3278 3279 return args_out->insert(args, vm_options_file_args->get(), 3280 vm_options_file_pos); 3281 } 3282 3283 // Expand -XX:VMOptionsFile found in args_in as needed. 3284 // mod_args and args_out parameters may return values as needed. 3285 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3286 ScopedVMInitArgs* mod_args, 3287 JavaVMInitArgs** args_out) { 3288 jint code = match_special_option_and_act(args_in, mod_args); 3289 if (code != JNI_OK) { 3290 return code; 3291 } 3292 3293 if (mod_args->is_set()) { 3294 // args_in contains -XX:VMOptionsFile and mod_args contains the 3295 // original options from args_in along with the options expanded 3296 // from the VMOptionsFile. Return a short-hand to the caller. 3297 *args_out = mod_args->get(); 3298 } else { 3299 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3300 } 3301 return JNI_OK; 3302 } 3303 3304 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3305 ScopedVMInitArgs* args_out) { 3306 // Remaining part of option string 3307 const char* tail; 3308 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3309 3310 for (int index = 0; index < args->nOptions; index++) { 3311 const JavaVMOption* option = args->options + index; 3312 if (match_option(option, "-XX:Flags=", &tail)) { 3313 Arguments::set_jvm_flags_file(tail); 3314 continue; 3315 } 3316 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3317 if (vm_options_file_args.found_vm_options_file_arg()) { 3318 jio_fprintf(defaultStream::error_stream(), 3319 "The option '%s' is already specified in the options " 3320 "container '%s' so the specification of '%s' in the " 3321 "same options container is an error.\n", 3322 vm_options_file_args.vm_options_file_arg(), 3323 vm_options_file_args.container_name(), 3324 option->optionString); 3325 return JNI_EINVAL; 3326 } 3327 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3328 // If there's a VMOptionsFile, parse that 3329 jint code = insert_vm_options_file(args, tail, index, 3330 &vm_options_file_args, args_out); 3331 if (code != JNI_OK) { 3332 return code; 3333 } 3334 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3335 if (args_out->is_set()) { 3336 // The VMOptions file inserted some options so switch 'args' 3337 // to the new set of options, and continue processing which 3338 // preserves "last option wins" semantics. 3339 args = args_out->get(); 3340 // The first option from the VMOptionsFile replaces the 3341 // current option. So we back track to process the 3342 // replacement option. 3343 index--; 3344 } 3345 continue; 3346 } 3347 if (match_option(option, "-XX:+PrintVMOptions")) { 3348 PrintVMOptions = true; 3349 continue; 3350 } 3351 if (match_option(option, "-XX:-PrintVMOptions")) { 3352 PrintVMOptions = false; 3353 continue; 3354 } 3355 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3356 IgnoreUnrecognizedVMOptions = true; 3357 continue; 3358 } 3359 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3360 IgnoreUnrecognizedVMOptions = false; 3361 continue; 3362 } 3363 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3364 JVMFlag::printFlags(tty, false); 3365 vm_exit(0); 3366 } 3367 3368 #ifndef PRODUCT 3369 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3370 JVMFlag::printFlags(tty, true); 3371 vm_exit(0); 3372 } 3373 #endif 3374 } 3375 return JNI_OK; 3376 } 3377 3378 static void print_options(const JavaVMInitArgs *args) { 3379 const char* tail; 3380 for (int index = 0; index < args->nOptions; index++) { 3381 const JavaVMOption *option = args->options + index; 3382 if (match_option(option, "-XX:", &tail)) { 3383 logOption(tail); 3384 } 3385 } 3386 } 3387 3388 bool Arguments::handle_deprecated_print_gc_flags() { 3389 if (PrintGC) { 3390 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3391 } 3392 if (PrintGCDetails) { 3393 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3394 } 3395 3396 if (_legacyGCLogging.lastFlag == 2) { 3397 // -Xloggc was used to specify a filename 3398 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3399 3400 LogTarget(Error, logging) target; 3401 LogStream errstream(target); 3402 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream); 3403 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3404 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3405 } 3406 return true; 3407 } 3408 3409 static void apply_debugger_ergo() { 3410 #ifdef ASSERT 3411 if (ReplayCompiles) { 3412 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3413 } 3414 3415 if (UseDebuggerErgo) { 3416 // Turn on sub-flags 3417 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3418 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3419 } 3420 3421 if (UseDebuggerErgo2) { 3422 // Debugging with limited number of CPUs 3423 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3424 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3425 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3426 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3427 } 3428 #endif // ASSERT 3429 } 3430 3431 // Parse entry point called from JNI_CreateJavaVM 3432 3433 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3434 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3435 JVMFlag::check_all_flag_declarations(); 3436 3437 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3438 const char* hotspotrc = ".hotspotrc"; 3439 bool settings_file_specified = false; 3440 bool needs_hotspotrc_warning = false; 3441 ScopedVMInitArgs initial_vm_options_args(""); 3442 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3443 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3444 3445 // Pointers to current working set of containers 3446 JavaVMInitArgs* cur_cmd_args; 3447 JavaVMInitArgs* cur_vm_options_args; 3448 JavaVMInitArgs* cur_java_options_args; 3449 JavaVMInitArgs* cur_java_tool_options_args; 3450 3451 // Containers for modified/expanded options 3452 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3453 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3454 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3455 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3456 3457 3458 jint code = 3459 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3460 if (code != JNI_OK) { 3461 return code; 3462 } 3463 3464 code = parse_java_options_environment_variable(&initial_java_options_args); 3465 if (code != JNI_OK) { 3466 return code; 3467 } 3468 3469 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3470 char *vmoptions = ClassLoader::lookup_vm_options(); 3471 if (vmoptions != nullptr) { 3472 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3473 FREE_C_HEAP_ARRAY(char, vmoptions); 3474 if (code != JNI_OK) { 3475 return code; 3476 } 3477 } 3478 3479 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3480 &mod_java_tool_options_args, 3481 &cur_java_tool_options_args); 3482 if (code != JNI_OK) { 3483 return code; 3484 } 3485 3486 code = expand_vm_options_as_needed(initial_cmd_args, 3487 &mod_cmd_args, 3488 &cur_cmd_args); 3489 if (code != JNI_OK) { 3490 return code; 3491 } 3492 3493 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3494 &mod_java_options_args, 3495 &cur_java_options_args); 3496 if (code != JNI_OK) { 3497 return code; 3498 } 3499 3500 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3501 &mod_vm_options_args, 3502 &cur_vm_options_args); 3503 if (code != JNI_OK) { 3504 return code; 3505 } 3506 3507 const char* flags_file = Arguments::get_jvm_flags_file(); 3508 settings_file_specified = (flags_file != nullptr); 3509 3510 if (IgnoreUnrecognizedVMOptions) { 3511 cur_cmd_args->ignoreUnrecognized = true; 3512 cur_java_tool_options_args->ignoreUnrecognized = true; 3513 cur_java_options_args->ignoreUnrecognized = true; 3514 } 3515 3516 // Parse specified settings file 3517 if (settings_file_specified) { 3518 if (!process_settings_file(flags_file, true, 3519 cur_cmd_args->ignoreUnrecognized)) { 3520 return JNI_EINVAL; 3521 } 3522 } else { 3523 #ifdef ASSERT 3524 // Parse default .hotspotrc settings file 3525 if (!process_settings_file(".hotspotrc", false, 3526 cur_cmd_args->ignoreUnrecognized)) { 3527 return JNI_EINVAL; 3528 } 3529 #else 3530 struct stat buf; 3531 if (os::stat(hotspotrc, &buf) == 0) { 3532 needs_hotspotrc_warning = true; 3533 } 3534 #endif 3535 } 3536 3537 if (PrintVMOptions) { 3538 print_options(cur_java_tool_options_args); 3539 print_options(cur_cmd_args); 3540 print_options(cur_java_options_args); 3541 } 3542 3543 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3544 jint result = parse_vm_init_args(cur_vm_options_args, 3545 cur_java_tool_options_args, 3546 cur_java_options_args, 3547 cur_cmd_args); 3548 3549 if (result != JNI_OK) { 3550 return result; 3551 } 3552 3553 // Delay warning until here so that we've had a chance to process 3554 // the -XX:-PrintWarnings flag 3555 if (needs_hotspotrc_warning) { 3556 warning("%s file is present but has been ignored. " 3557 "Run with -XX:Flags=%s to load the file.", 3558 hotspotrc, hotspotrc); 3559 } 3560 3561 if (needs_module_property_warning) { 3562 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3563 " names that are reserved for internal use."); 3564 } 3565 3566 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3567 UNSUPPORTED_OPTION(UseLargePages); 3568 #endif 3569 3570 #if defined(AIX) 3571 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3572 #endif 3573 3574 #ifndef PRODUCT 3575 if (TraceBytecodesAt != 0) { 3576 TraceBytecodes = true; 3577 } 3578 #endif // PRODUCT 3579 3580 if (ScavengeRootsInCode == 0) { 3581 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3582 warning("Forcing ScavengeRootsInCode non-zero"); 3583 } 3584 ScavengeRootsInCode = 1; 3585 } 3586 3587 if (!handle_deprecated_print_gc_flags()) { 3588 return JNI_EINVAL; 3589 } 3590 3591 // Set object alignment values. 3592 set_object_alignment(); 3593 3594 #if !INCLUDE_CDS 3595 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) { 3596 jio_fprintf(defaultStream::error_stream(), 3597 "Shared spaces are not supported in this VM\n"); 3598 return JNI_ERR; 3599 } 3600 if (DumpLoadedClassList != nullptr) { 3601 jio_fprintf(defaultStream::error_stream(), 3602 "DumpLoadedClassList is not supported in this VM\n"); 3603 return JNI_ERR; 3604 } 3605 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) || 3606 log_is_enabled(Info, cds)) { 3607 warning("Shared spaces are not supported in this VM"); 3608 UseSharedSpaces = false; 3609 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3610 } 3611 no_shared_spaces("CDS Disabled"); 3612 #endif // INCLUDE_CDS 3613 3614 // Verify NMT arguments 3615 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 3616 if (lvl == NMT_unknown) { 3617 jio_fprintf(defaultStream::error_stream(), 3618 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n"); 3619 return JNI_ERR; 3620 } 3621 if (PrintNMTStatistics && lvl == NMT_off) { 3622 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 3623 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 3624 } 3625 3626 bool trace_dependencies = log_is_enabled(Debug, dependencies); 3627 if (trace_dependencies && VerifyDependencies) { 3628 warning("dependency logging results may be inflated by VerifyDependencies"); 3629 } 3630 3631 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) || 3632 log_is_enabled(Info, class, load, cause); 3633 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) { 3634 warning("class load cause logging will not produce output without LogClassLoadingCauseFor"); 3635 } 3636 3637 apply_debugger_ergo(); 3638 3639 // The VMThread needs to stop now and then to execute these debug options. 3640 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) { 3641 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000); 3642 } 3643 3644 if (log_is_enabled(Info, arguments)) { 3645 LogStream st(Log(arguments)::info()); 3646 Arguments::print_on(&st); 3647 } 3648 3649 return JNI_OK; 3650 } 3651 3652 jint Arguments::apply_ergo() { 3653 // Set flags based on ergonomics. 3654 jint result = set_ergonomics_flags(); 3655 if (result != JNI_OK) return result; 3656 3657 // Set heap size based on available physical memory 3658 set_heap_size(); 3659 3660 GCConfig::arguments()->initialize(); 3661 3662 CDSConfig::initialize(); 3663 3664 // Initialize Metaspace flags and alignments 3665 Metaspace::ergo_initialize(); 3666 3667 if (!StringDedup::ergo_initialize()) { 3668 return JNI_EINVAL; 3669 } 3670 3671 // Set compiler flags after GC is selected and GC specific 3672 // flags (LoopStripMiningIter) are set. 3673 CompilerConfig::ergo_initialize(); 3674 3675 // Set bytecode rewriting flags 3676 set_bytecode_flags(); 3677 3678 // Set flags if aggressive optimization flags are enabled 3679 jint code = set_aggressive_opts_flags(); 3680 if (code != JNI_OK) { 3681 return code; 3682 } 3683 3684 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) { 3685 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table()); 3686 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) { 3687 warning("UseSecondarySupersTable is not supported"); 3688 FLAG_SET_DEFAULT(UseSecondarySupersTable, false); 3689 } 3690 UseSecondarySupersTable = false; // FIXME: Disabled for Leyden. Neet to fix SCAddressTable::id_for_address() 3691 if (!UseSecondarySupersTable) { 3692 FLAG_SET_DEFAULT(StressSecondarySupers, false); 3693 FLAG_SET_DEFAULT(VerifySecondarySupers, false); 3694 } 3695 3696 #ifdef ZERO 3697 // Clear flags not supported on zero. 3698 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3699 #endif // ZERO 3700 3701 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3702 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3703 DebugNonSafepoints = true; 3704 } 3705 3706 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3707 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3708 } 3709 3710 // Treat the odd case where local verification is enabled but remote 3711 // verification is not as if both were enabled. 3712 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 3713 log_info(verification)("Turning on remote verification because local verification is on"); 3714 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 3715 } 3716 3717 #ifndef PRODUCT 3718 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3719 if (use_vm_log()) { 3720 LogVMOutput = true; 3721 } 3722 } 3723 #endif // PRODUCT 3724 3725 if (PrintCommandLineFlags) { 3726 JVMFlag::printSetFlags(tty); 3727 } 3728 3729 #if COMPILER2_OR_JVMCI 3730 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 3731 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 3732 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 3733 } 3734 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 3735 3736 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 3737 if (!EnableVectorReboxing) { 3738 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 3739 } else { 3740 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 3741 } 3742 } 3743 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 3744 3745 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 3746 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 3747 } 3748 FLAG_SET_DEFAULT(UseVectorStubs, false); 3749 } 3750 #endif // COMPILER2_OR_JVMCI 3751 3752 if (log_is_enabled(Info, init)) { 3753 if (FLAG_IS_DEFAULT(ProfileVMLocks)) { 3754 FLAG_SET_DEFAULT(ProfileVMLocks, true); 3755 } 3756 if (UsePerfData && !log_is_enabled(Info, perf, class, link)) { 3757 // automatically enable -Xlog:perf+class+link 3758 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(perf, class, link)); 3759 } 3760 // Don't turn on ProfileVMCalls and ProfileRuntimeCalls by default. 3761 } else { 3762 if (!FLAG_IS_DEFAULT(ProfileVMLocks) && ProfileVMLocks) { 3763 warning("Disabling ProfileVMLocks since logging is turned off."); 3764 FLAG_SET_DEFAULT(ProfileVMLocks, false); 3765 } 3766 if (!FLAG_IS_DEFAULT(ProfileVMCalls) && ProfileVMCalls) { 3767 warning("Disabling ProfileVMCalls since logging is turned off."); 3768 FLAG_SET_DEFAULT(ProfileVMCalls, false); 3769 } 3770 if (!FLAG_IS_DEFAULT(ProfileRuntimeCalls) && ProfileRuntimeCalls) { 3771 warning("Disabling ProfileRuntimeCalls since logging is turned off."); 3772 FLAG_SET_DEFAULT(ProfileRuntimeCalls, false); 3773 } 3774 if (log_is_enabled(Info, perf, class, link)) { 3775 warning("Disabling -Xlog:perf+class+link since logging is turned off."); 3776 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link)); 3777 } 3778 } 3779 if (FLAG_IS_DEFAULT(PerfDataMemorySize)) { 3780 if (ProfileVMLocks || ProfileVMCalls || ProfileRuntimeCalls) { 3781 FLAG_SET_DEFAULT(PerfDataMemorySize, 128*K); // reserve more space for extra perf counters 3782 } 3783 } 3784 3785 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 3786 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 3787 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 3788 } 3789 } 3790 return JNI_OK; 3791 } 3792 3793 jint Arguments::adjust_after_os() { 3794 if (UseNUMA) { 3795 if (UseParallelGC) { 3796 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3797 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3798 } 3799 } 3800 } 3801 return JNI_OK; 3802 } 3803 3804 int Arguments::PropertyList_count(SystemProperty* pl) { 3805 int count = 0; 3806 while(pl != nullptr) { 3807 count++; 3808 pl = pl->next(); 3809 } 3810 return count; 3811 } 3812 3813 // Return the number of readable properties. 3814 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 3815 int count = 0; 3816 while(pl != nullptr) { 3817 if (pl->readable()) { 3818 count++; 3819 } 3820 pl = pl->next(); 3821 } 3822 return count; 3823 } 3824 3825 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3826 assert(key != nullptr, "just checking"); 3827 SystemProperty* prop; 3828 for (prop = pl; prop != nullptr; prop = prop->next()) { 3829 if (strcmp(key, prop->key()) == 0) return prop->value(); 3830 } 3831 return nullptr; 3832 } 3833 3834 // Return the value of the requested property provided that it is a readable property. 3835 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 3836 assert(key != nullptr, "just checking"); 3837 SystemProperty* prop; 3838 // Return the property value if the keys match and the property is not internal or 3839 // it's the special internal property "jdk.boot.class.path.append". 3840 for (prop = pl; prop != nullptr; prop = prop->next()) { 3841 if (strcmp(key, prop->key()) == 0) { 3842 if (!prop->internal()) { 3843 return prop->value(); 3844 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 3845 return prop->value(); 3846 } else { 3847 // Property is internal and not jdk.boot.class.path.append so return null. 3848 return nullptr; 3849 } 3850 } 3851 } 3852 return nullptr; 3853 } 3854 3855 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3856 SystemProperty* p = *plist; 3857 if (p == nullptr) { 3858 *plist = new_p; 3859 } else { 3860 while (p->next() != nullptr) { 3861 p = p->next(); 3862 } 3863 p->set_next(new_p); 3864 } 3865 } 3866 3867 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 3868 bool writeable, bool internal) { 3869 if (plist == nullptr) 3870 return; 3871 3872 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 3873 PropertyList_add(plist, new_p); 3874 } 3875 3876 void Arguments::PropertyList_add(SystemProperty *element) { 3877 PropertyList_add(&_system_properties, element); 3878 } 3879 3880 // This add maintains unique property key in the list. 3881 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 3882 PropertyAppendable append, PropertyWriteable writeable, 3883 PropertyInternal internal) { 3884 if (plist == nullptr) 3885 return; 3886 3887 // If property key exists and is writeable, then update with new value. 3888 // Trying to update a non-writeable property is silently ignored. 3889 SystemProperty* prop; 3890 for (prop = *plist; prop != nullptr; prop = prop->next()) { 3891 if (strcmp(k, prop->key()) == 0) { 3892 if (append == AppendProperty) { 3893 prop->append_writeable_value(v); 3894 } else { 3895 prop->set_writeable_value(v); 3896 } 3897 return; 3898 } 3899 } 3900 3901 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 3902 } 3903 3904 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 3905 // Returns true if all of the source pointed by src has been copied over to 3906 // the destination buffer pointed by buf. Otherwise, returns false. 3907 // Notes: 3908 // 1. If the length (buflen) of the destination buffer excluding the 3909 // null terminator character is not long enough for holding the expanded 3910 // pid characters, it also returns false instead of returning the partially 3911 // expanded one. 3912 // 2. The passed in "buflen" should be large enough to hold the null terminator. 3913 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 3914 char* buf, size_t buflen) { 3915 const char* p = src; 3916 char* b = buf; 3917 const char* src_end = &src[srclen]; 3918 char* buf_end = &buf[buflen - 1]; 3919 3920 while (p < src_end && b < buf_end) { 3921 if (*p == '%') { 3922 switch (*(++p)) { 3923 case '%': // "%%" ==> "%" 3924 *b++ = *p++; 3925 break; 3926 case 'p': { // "%p" ==> current process id 3927 // buf_end points to the character before the last character so 3928 // that we could write '\0' to the end of the buffer. 3929 size_t buf_sz = buf_end - b + 1; 3930 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 3931 3932 // if jio_snprintf fails or the buffer is not long enough to hold 3933 // the expanded pid, returns false. 3934 if (ret < 0 || ret >= (int)buf_sz) { 3935 return false; 3936 } else { 3937 b += ret; 3938 assert(*b == '\0', "fail in copy_expand_pid"); 3939 if (p == src_end && b == buf_end + 1) { 3940 // reach the end of the buffer. 3941 return true; 3942 } 3943 } 3944 p++; 3945 break; 3946 } 3947 default : 3948 *b++ = '%'; 3949 } 3950 } else { 3951 *b++ = *p++; 3952 } 3953 } 3954 *b = '\0'; 3955 return (p == src_end); // return false if not all of the source was copied 3956 } --- EOF ---