1 /* 2 * Copyright (c) 1997, 2025, 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 "cds/cds_globals.hpp" 26 #include "cds/cdsConfig.hpp" 27 #include "cds/filemap.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/javaAssertions.hpp" 30 #include "classfile/moduleEntry.hpp" 31 #include "classfile/stringTable.hpp" 32 #include "classfile/symbolTable.hpp" 33 #include "compiler/compilerDefinitions.hpp" 34 #include "gc/shared/gcArguments.hpp" 35 #include "gc/shared/gcConfig.hpp" 36 #include "gc/shared/genArguments.hpp" 37 #include "gc/shared/stringdedup/stringDedup.hpp" 38 #include "gc/shared/tlab_globals.hpp" 39 #include "jvm.h" 40 #include "logging/log.hpp" 41 #include "logging/logConfiguration.hpp" 42 #include "logging/logStream.hpp" 43 #include "logging/logTag.hpp" 44 #include "memory/allocation.inline.hpp" 45 #include "nmt/nmtCommon.hpp" 46 #include "oops/compressedKlass.hpp" 47 #include "oops/instanceKlass.hpp" 48 #include "oops/objLayout.hpp" 49 #include "oops/oop.inline.hpp" 50 #include "prims/jvmtiAgentList.hpp" 51 #include "prims/jvmtiExport.hpp" 52 #include "runtime/arguments.hpp" 53 #include "runtime/flags/jvmFlag.hpp" 54 #include "runtime/flags/jvmFlagAccess.hpp" 55 #include "runtime/flags/jvmFlagLimit.hpp" 56 #include "runtime/globals_extension.hpp" 57 #include "runtime/java.hpp" 58 #include "runtime/os.hpp" 59 #include "runtime/safepoint.hpp" 60 #include "runtime/safepointMechanism.hpp" 61 #include "runtime/synchronizer.hpp" 62 #include "runtime/vm_version.hpp" 63 #include "services/management.hpp" 64 #include "utilities/align.hpp" 65 #include "utilities/checkedCast.hpp" 66 #include "utilities/debug.hpp" 67 #include "utilities/defaultStream.hpp" 68 #include "utilities/macros.hpp" 69 #include "utilities/parseInteger.hpp" 70 #include "utilities/powerOfTwo.hpp" 71 #include "utilities/stringUtils.hpp" 72 #include "utilities/systemMemoryBarrier.hpp" 73 #if INCLUDE_JFR 74 #include "jfr/jfr.hpp" 75 #endif 76 77 #include <limits> 78 #include <string.h> 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 unsigned int Arguments::_addmods_count = 0; 90 char* Arguments::_java_command = nullptr; 91 SystemProperty* Arguments::_system_properties = nullptr; 92 size_t Arguments::_conservative_max_heap_alignment = 0; 93 Arguments::Mode Arguments::_mode = _mixed; 94 const char* Arguments::_java_vendor_url_bug = nullptr; 95 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 96 bool Arguments::_sun_java_launcher_is_altjvm = false; 97 98 // These parameters are reset in method parse_vm_init_args() 99 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 100 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 101 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 102 bool Arguments::_ClipInlining = ClipInlining; 103 size_t Arguments::_default_SharedBaseAddress = SharedBaseAddress; 104 105 bool Arguments::_enable_preview = false; 106 107 LegacyGCLogging Arguments::_legacyGCLogging = { nullptr, 0 }; 108 109 // These are not set by the JDK's built-in launchers, but they can be set by 110 // programs that embed the JVM using JNI_CreateJavaVM. See comments around 111 // JavaVMOption in jni.h. 112 abort_hook_t Arguments::_abort_hook = nullptr; 113 exit_hook_t Arguments::_exit_hook = nullptr; 114 vfprintf_hook_t Arguments::_vfprintf_hook = nullptr; 115 116 117 SystemProperty *Arguments::_sun_boot_library_path = nullptr; 118 SystemProperty *Arguments::_java_library_path = nullptr; 119 SystemProperty *Arguments::_java_home = nullptr; 120 SystemProperty *Arguments::_java_class_path = nullptr; 121 SystemProperty *Arguments::_jdk_boot_class_path_append = nullptr; 122 SystemProperty *Arguments::_vm_info = nullptr; 123 124 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = nullptr; 125 PathString *Arguments::_boot_class_path = nullptr; 126 bool Arguments::_has_jimage = false; 127 128 char* Arguments::_ext_dirs = nullptr; 129 130 // True if -Xshare:auto option was specified. 131 static bool xshare_auto_cmd_line = false; 132 133 // True if -Xint/-Xmixed/-Xcomp were specified 134 static bool mode_flag_cmd_line = false; 135 136 bool PathString::set_value(const char *value, AllocFailType alloc_failmode) { 137 char* new_value = AllocateHeap(strlen(value)+1, mtArguments, alloc_failmode); 138 if (new_value == nullptr) { 139 assert(alloc_failmode == AllocFailStrategy::RETURN_NULL, "must be"); 140 return false; 141 } 142 if (_value != nullptr) { 143 FreeHeap(_value); 144 } 145 _value = new_value; 146 strcpy(_value, value); 147 return true; 148 } 149 150 void PathString::append_value(const char *value) { 151 char *sp; 152 size_t len = 0; 153 if (value != nullptr) { 154 len = strlen(value); 155 if (_value != nullptr) { 156 len += strlen(_value); 157 } 158 sp = AllocateHeap(len+2, mtArguments); 159 assert(sp != nullptr, "Unable to allocate space for new append path value"); 160 if (sp != nullptr) { 161 if (_value != nullptr) { 162 strcpy(sp, _value); 163 strcat(sp, os::path_separator()); 164 strcat(sp, value); 165 FreeHeap(_value); 166 } else { 167 strcpy(sp, value); 168 } 169 _value = sp; 170 } 171 } 172 } 173 174 PathString::PathString(const char* value) { 175 if (value == nullptr) { 176 _value = nullptr; 177 } else { 178 _value = AllocateHeap(strlen(value)+1, mtArguments); 179 strcpy(_value, value); 180 } 181 } 182 183 PathString::~PathString() { 184 if (_value != nullptr) { 185 FreeHeap(_value); 186 _value = nullptr; 187 } 188 } 189 190 ModulePatchPath::ModulePatchPath(const char* module_name, const char* path) { 191 assert(module_name != nullptr && path != nullptr, "Invalid module name or path value"); 192 size_t len = strlen(module_name) + 1; 193 _module_name = AllocateHeap(len, mtInternal); 194 strncpy(_module_name, module_name, len); // copy the trailing null 195 _path = new PathString(path); 196 } 197 198 ModulePatchPath::~ModulePatchPath() { 199 if (_module_name != nullptr) { 200 FreeHeap(_module_name); 201 _module_name = nullptr; 202 } 203 if (_path != nullptr) { 204 delete _path; 205 _path = nullptr; 206 } 207 } 208 209 SystemProperty::SystemProperty(const char* key, const char* value, bool writeable, bool internal) : PathString(value) { 210 if (key == nullptr) { 211 _key = nullptr; 212 } else { 213 _key = AllocateHeap(strlen(key)+1, mtArguments); 214 strcpy(_key, key); 215 } 216 _next = nullptr; 217 _internal = internal; 218 _writeable = writeable; 219 } 220 221 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 222 // part of the option string. 223 static bool match_option(const JavaVMOption *option, const char* name, 224 const char** tail) { 225 size_t len = strlen(name); 226 if (strncmp(option->optionString, name, len) == 0) { 227 *tail = option->optionString + len; 228 return true; 229 } else { 230 return false; 231 } 232 } 233 234 // Check if 'option' matches 'name'. No "tail" is allowed. 235 static bool match_option(const JavaVMOption *option, const char* name) { 236 const char* tail = nullptr; 237 bool result = match_option(option, name, &tail); 238 if (tail != nullptr && *tail == '\0') { 239 return result; 240 } else { 241 return false; 242 } 243 } 244 245 // Return true if any of the strings in null-terminated array 'names' matches. 246 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 247 // the option must match exactly. 248 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 249 bool tail_allowed) { 250 for (/* empty */; *names != nullptr; ++names) { 251 if (match_option(option, *names, tail)) { 252 if (**tail == '\0' || (tail_allowed && **tail == ':')) { 253 return true; 254 } 255 } 256 } 257 return false; 258 } 259 260 #if INCLUDE_JFR 261 static bool _has_jfr_option = false; // is using JFR 262 263 // return true on failure 264 static bool match_jfr_option(const JavaVMOption** option) { 265 assert((*option)->optionString != nullptr, "invariant"); 266 char* tail = nullptr; 267 if (match_option(*option, "-XX:StartFlightRecording", (const char**)&tail)) { 268 _has_jfr_option = true; 269 return Jfr::on_start_flight_recording_option(option, tail); 270 } else if (match_option(*option, "-XX:FlightRecorderOptions", (const char**)&tail)) { 271 _has_jfr_option = true; 272 return Jfr::on_flight_recorder_option(option, tail); 273 } 274 return false; 275 } 276 277 bool Arguments::has_jfr_option() { 278 return _has_jfr_option; 279 } 280 #endif 281 282 static void logOption(const char* opt) { 283 if (PrintVMOptions) { 284 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 285 } 286 } 287 288 bool needs_module_property_warning = false; 289 290 #define MODULE_PROPERTY_PREFIX "jdk.module." 291 #define MODULE_PROPERTY_PREFIX_LEN 11 292 #define ADDEXPORTS "addexports" 293 #define ADDEXPORTS_LEN 10 294 #define ADDREADS "addreads" 295 #define ADDREADS_LEN 8 296 #define ADDOPENS "addopens" 297 #define ADDOPENS_LEN 8 298 #define PATCH "patch" 299 #define PATCH_LEN 5 300 #define ADDMODS "addmods" 301 #define ADDMODS_LEN 7 302 #define LIMITMODS "limitmods" 303 #define LIMITMODS_LEN 9 304 #define PATH "path" 305 #define PATH_LEN 4 306 #define UPGRADE_PATH "upgrade.path" 307 #define UPGRADE_PATH_LEN 12 308 #define ENABLE_NATIVE_ACCESS "enable.native.access" 309 #define ENABLE_NATIVE_ACCESS_LEN 20 310 #define ILLEGAL_NATIVE_ACCESS "illegal.native.access" 311 #define ILLEGAL_NATIVE_ACCESS_LEN 21 312 313 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 314 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 315 return ((strncmp(option, property, len) == 0) && 316 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 317 } 318 319 // Return true if property starts with "jdk.module." and its ensuing chars match 320 // any of the reserved module properties. 321 // property should be passed without the leading "-D". 322 bool Arguments::is_internal_module_property(const char* property) { 323 return internal_module_property_helper(property, false); 324 } 325 326 // Returns true if property is one of those recognized by is_internal_module_property() but 327 // is not supported by CDS archived full module graph. 328 bool Arguments::is_incompatible_cds_internal_module_property(const char* property) { 329 return internal_module_property_helper(property, true); 330 } 331 332 bool Arguments::internal_module_property_helper(const char* property, bool check_for_cds) { 333 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 334 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 335 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 336 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 337 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 338 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 339 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 340 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN) || 341 matches_property_suffix(property_suffix, ILLEGAL_NATIVE_ACCESS, ILLEGAL_NATIVE_ACCESS_LEN)) { 342 return true; 343 } 344 345 if (!check_for_cds) { 346 // CDS notes: these properties are supported by CDS archived full module graph. 347 if (matches_property_suffix(property_suffix, PATH, PATH_LEN) || 348 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 349 matches_property_suffix(property_suffix, ENABLE_NATIVE_ACCESS, ENABLE_NATIVE_ACCESS_LEN)) { 350 return true; 351 } 352 } 353 } 354 return false; 355 } 356 357 // Process java launcher properties. 358 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 359 // See if sun.java.launcher or sun.java.launcher.is_altjvm is defined. 360 // Must do this before setting up other system properties, 361 // as some of them may depend on launcher type. 362 for (int index = 0; index < args->nOptions; index++) { 363 const JavaVMOption* option = args->options + index; 364 const char* tail; 365 366 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 367 process_java_launcher_argument(tail, option->extraInfo); 368 continue; 369 } 370 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 371 if (strcmp(tail, "true") == 0) { 372 _sun_java_launcher_is_altjvm = true; 373 } 374 continue; 375 } 376 } 377 } 378 379 // Initialize system properties key and value. 380 void Arguments::init_system_properties() { 381 382 // Set up _boot_class_path which is not a property but 383 // relies heavily on argument processing and the jdk.boot.class.path.append 384 // property. It is used to store the underlying boot class path. 385 _boot_class_path = new PathString(nullptr); 386 387 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 388 "Java Virtual Machine Specification", false)); 389 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 390 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 391 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 392 393 // Initialize the vm.info now, but it will need updating after argument parsing. 394 _vm_info = new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true); 395 396 // Following are JVMTI agent writable properties. 397 // Properties values are set to nullptr and they are 398 // os specific they are initialized in os::init_system_properties_values(). 399 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", nullptr, true); 400 _java_library_path = new SystemProperty("java.library.path", nullptr, true); 401 _java_home = new SystemProperty("java.home", nullptr, true); 402 _java_class_path = new SystemProperty("java.class.path", "", true); 403 // jdk.boot.class.path.append is a non-writeable, internal property. 404 // It can only be set by either: 405 // - -Xbootclasspath/a: 406 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 407 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", nullptr, false, true); 408 409 // Add to System Property list. 410 PropertyList_add(&_system_properties, _sun_boot_library_path); 411 PropertyList_add(&_system_properties, _java_library_path); 412 PropertyList_add(&_system_properties, _java_home); 413 PropertyList_add(&_system_properties, _java_class_path); 414 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 415 PropertyList_add(&_system_properties, _vm_info); 416 417 // Set OS specific system properties values 418 os::init_system_properties_values(); 419 } 420 421 // Update/Initialize System properties after JDK version number is known 422 void Arguments::init_version_specific_system_properties() { 423 enum { bufsz = 16 }; 424 char buffer[bufsz]; 425 const char* spec_vendor = "Oracle Corporation"; 426 uint32_t spec_version = JDK_Version::current().major_version(); 427 428 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 429 430 PropertyList_add(&_system_properties, 431 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 432 PropertyList_add(&_system_properties, 433 new SystemProperty("java.vm.specification.version", buffer, false)); 434 PropertyList_add(&_system_properties, 435 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 436 } 437 438 /* 439 * -XX argument processing: 440 * 441 * -XX arguments are defined in several places, such as: 442 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 443 * -XX arguments are parsed in parse_argument(). 444 * -XX argument bounds checking is done in check_vm_args_consistency(). 445 * 446 * Over time -XX arguments may change. There are mechanisms to handle common cases: 447 * 448 * ALIASED: An option that is simply another name for another option. This is often 449 * part of the process of deprecating a flag, but not all aliases need 450 * to be deprecated. 451 * 452 * Create an alias for an option by adding the old and new option names to the 453 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 454 * 455 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 456 * support may be removed in the future. Both regular and aliased options may be 457 * deprecated. 458 * 459 * Add a deprecation warning for an option (or alias) by adding an entry in the 460 * "special_jvm_flags" table and setting the "deprecated_in" field. 461 * Often an option "deprecated" in one major release will 462 * be made "obsolete" in the next. In this case the entry should also have its 463 * "obsolete_in" field set. 464 * 465 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 466 * on the command line. A warning is printed to let the user know that option might not 467 * be accepted in the future. 468 * 469 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 470 * table and setting the "obsolete_in" field. 471 * 472 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 473 * to the current JDK version. The system will flatly refuse to admit the existence of 474 * the flag. This allows a flag to die automatically over JDK releases. 475 * 476 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 477 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 478 * - Newly obsolete or expired deprecated options should have their global variable 479 * definitions removed (from globals.hpp, etc) and related implementations removed. 480 * 481 * Recommended approach for removing options: 482 * 483 * To remove options commonly used by customers (e.g. product -XX options), use 484 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 485 * 486 * To remove internal options (e.g. diagnostic, experimental, develop options), use 487 * a 2-step model adding major release numbers to the obsolete and expire columns. 488 * 489 * To change the name of an option, use the alias table as well as a 2-step 490 * model adding major release numbers to the deprecate and expire columns. 491 * Think twice about aliasing commonly used customer options. 492 * 493 * There are times when it is appropriate to leave a future release number as undefined. 494 * 495 * Tests: Aliases should be tested in VMAliasOptions.java. 496 * Deprecated options should be tested in VMDeprecatedOptions.java. 497 */ 498 499 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 500 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 501 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 502 // the command-line as usual, but will issue a warning. 503 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 504 // the command-line, while issuing a warning and ignoring the flag value. 505 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 506 // existence of the flag. 507 // 508 // MANUAL CLEANUP ON JDK VERSION UPDATES: 509 // This table ensures that the handling of options will update automatically when the JDK 510 // version is incremented, but the source code needs to be cleanup up manually: 511 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 512 // variable should be removed, as well as users of the variable. 513 // - As "deprecated" options age into "obsolete" options, move the entry into the 514 // "Obsolete Flags" section of the table. 515 // - All expired options should be removed from the table. 516 static SpecialFlag const special_jvm_flags[] = { 517 // -------------- Deprecated Flags -------------- 518 // --- Non-alias flags - sorted by obsolete_in then expired_in: 519 { "AllowRedefinitionToAddDeleteMethods", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 520 { "FlightRecorder", JDK_Version::jdk(13), JDK_Version::undefined(), JDK_Version::undefined() }, 521 { "DumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 522 { "DynamicDumpSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 523 { "RequireSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 524 { "UseSharedSpaces", JDK_Version::jdk(18), JDK_Version::jdk(19), JDK_Version::undefined() }, 525 #ifdef LINUX 526 { "UseLinuxPosixThreadCPUClocks", JDK_Version::jdk(24), JDK_Version::jdk(25), JDK_Version::jdk(26) }, 527 { "UseOprofile", JDK_Version::jdk(25), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 528 #endif 529 { "LockingMode", JDK_Version::jdk(24), JDK_Version::jdk(26), JDK_Version::jdk(27) }, 530 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 531 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 532 533 // -------------- Obsolete Flags - sorted by expired_in -------------- 534 535 { "MetaspaceReclaimPolicy", JDK_Version::undefined(), JDK_Version::jdk(21), JDK_Version::undefined() }, 536 { "ZGenerational", JDK_Version::jdk(23), JDK_Version::jdk(24), JDK_Version::undefined() }, 537 538 #ifdef ASSERT 539 { "DummyObsoleteTestFlag", JDK_Version::undefined(), JDK_Version::jdk(18), JDK_Version::undefined() }, 540 #endif 541 542 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 543 // These entries will generate build errors. Their purpose is to test the macros. 544 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 545 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 546 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 547 { "obs > exp", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::jdk(10) }, 548 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 549 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 550 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 551 #endif 552 553 { nullptr, JDK_Version(0), JDK_Version(0) } 554 }; 555 556 // Flags that are aliases for other flags. 557 typedef struct { 558 const char* alias_name; 559 const char* real_name; 560 } AliasedFlag; 561 562 static AliasedFlag const aliased_jvm_flags[] = { 563 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 564 { nullptr, nullptr} 565 }; 566 567 // Return true if "v" is less than "other", where "other" may be "undefined". 568 static bool version_less_than(JDK_Version v, JDK_Version other) { 569 assert(!v.is_undefined(), "must be defined"); 570 if (!other.is_undefined() && v.compare(other) >= 0) { 571 return false; 572 } else { 573 return true; 574 } 575 } 576 577 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 578 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 579 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 580 flag = special_jvm_flags[i]; 581 return true; 582 } 583 } 584 return false; 585 } 586 587 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 588 assert(version != nullptr, "Must provide a version buffer"); 589 SpecialFlag flag; 590 if (lookup_special_flag(flag_name, flag)) { 591 if (!flag.obsolete_in.is_undefined()) { 592 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 593 *version = flag.obsolete_in; 594 // This flag may have been marked for obsoletion in this version, but we may not 595 // have actually removed it yet. Rather than ignoring it as soon as we reach 596 // this version we allow some time for the removal to happen. So if the flag 597 // still actually exists we process it as normal, but issue an adjusted warning. 598 const JVMFlag *real_flag = JVMFlag::find_declared_flag(flag_name); 599 if (real_flag != nullptr) { 600 char version_str[256]; 601 version->to_string(version_str, sizeof(version_str)); 602 warning("Temporarily processing option %s; support is scheduled for removal in %s", 603 flag_name, version_str); 604 return false; 605 } 606 return true; 607 } 608 } 609 } 610 return false; 611 } 612 613 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 614 assert(version != nullptr, "Must provide a version buffer"); 615 SpecialFlag flag; 616 if (lookup_special_flag(flag_name, flag)) { 617 if (!flag.deprecated_in.is_undefined()) { 618 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 619 version_less_than(JDK_Version::current(), flag.expired_in)) { 620 *version = flag.deprecated_in; 621 return 1; 622 } else { 623 return -1; 624 } 625 } 626 } 627 return 0; 628 } 629 630 const char* Arguments::real_flag_name(const char *flag_name) { 631 for (size_t i = 0; aliased_jvm_flags[i].alias_name != nullptr; i++) { 632 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 633 if (strcmp(flag_status.alias_name, flag_name) == 0) { 634 return flag_status.real_name; 635 } 636 } 637 return flag_name; 638 } 639 640 #ifdef ASSERT 641 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 642 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 643 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 644 return true; 645 } 646 } 647 return false; 648 } 649 650 // Verifies the correctness of the entries in the special_jvm_flags table. 651 // If there is a semantic error (i.e. a bug in the table) such as the obsoletion 652 // version being earlier than the deprecation version, then a warning is issued 653 // and verification fails - by returning false. If it is detected that the table 654 // is out of date, with respect to the current version, then ideally a warning is 655 // issued but verification does not fail. This allows the VM to operate when the 656 // version is first updated, without needing to update all the impacted flags at 657 // the same time. In practice we can't issue the warning immediately when the version 658 // is updated as it occurs for every test and some tests are not prepared to handle 659 // unexpected output - see 8196739. Instead we only check if the table is up-to-date 660 // if the check_globals flag is true, and in addition allow a grace period and only 661 // check for stale flags when we hit build 25 (which is far enough into the 6 month 662 // release cycle that all flag updates should have been processed, whilst still 663 // leaving time to make the change before RDP2). 664 // We use a gtest to call this, passing true, so that we can detect stale flags before 665 // the end of the release cycle. 666 667 static const int SPECIAL_FLAG_VALIDATION_BUILD = 25; 668 669 bool Arguments::verify_special_jvm_flags(bool check_globals) { 670 bool success = true; 671 for (size_t i = 0; special_jvm_flags[i].name != nullptr; i++) { 672 const SpecialFlag& flag = special_jvm_flags[i]; 673 if (lookup_special_flag(flag.name, i)) { 674 warning("Duplicate special flag declaration \"%s\"", flag.name); 675 success = false; 676 } 677 if (flag.deprecated_in.is_undefined() && 678 flag.obsolete_in.is_undefined()) { 679 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 680 success = false; 681 } 682 683 if (!flag.deprecated_in.is_undefined()) { 684 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 685 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 686 success = false; 687 } 688 689 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 690 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 691 success = false; 692 } 693 } 694 695 if (!flag.obsolete_in.is_undefined()) { 696 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 697 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 698 success = false; 699 } 700 701 // if flag has become obsolete it should not have a "globals" flag defined anymore. 702 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 703 !version_less_than(JDK_Version::current(), flag.obsolete_in)) { 704 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 705 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 706 success = false; 707 } 708 } 709 710 } else if (!flag.expired_in.is_undefined()) { 711 warning("Special flag entry \"%s\" must be explicitly obsoleted before expired.", flag.name); 712 success = false; 713 } 714 715 if (!flag.expired_in.is_undefined()) { 716 // if flag has become expired it should not have a "globals" flag defined anymore. 717 if (check_globals && VM_Version::vm_build_number() >= SPECIAL_FLAG_VALIDATION_BUILD && 718 !version_less_than(JDK_Version::current(), flag.expired_in)) { 719 if (JVMFlag::find_declared_flag(flag.name) != nullptr) { 720 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 721 success = false; 722 } 723 } 724 } 725 } 726 return success; 727 } 728 #endif 729 730 bool Arguments::atojulong(const char *s, julong* result) { 731 return parse_integer(s, result); 732 } 733 734 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size, julong max_size) { 735 if (size < min_size) return arg_too_small; 736 if (size > max_size) return arg_too_big; 737 return arg_in_range; 738 } 739 740 // Describe an argument out of range error 741 void Arguments::describe_range_error(ArgsRange errcode) { 742 switch(errcode) { 743 case arg_too_big: 744 jio_fprintf(defaultStream::error_stream(), 745 "The specified size exceeds the maximum " 746 "representable size.\n"); 747 break; 748 case arg_too_small: 749 case arg_unreadable: 750 case arg_in_range: 751 // do nothing for now 752 break; 753 default: 754 ShouldNotReachHere(); 755 } 756 } 757 758 static bool set_bool_flag(JVMFlag* flag, bool value, JVMFlagOrigin origin) { 759 if (JVMFlagAccess::set_bool(flag, &value, origin) == JVMFlag::SUCCESS) { 760 return true; 761 } else { 762 return false; 763 } 764 } 765 766 static bool set_fp_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 767 // strtod allows leading whitespace, but our flag format does not. 768 if (*value == '\0' || isspace((unsigned char) *value)) { 769 return false; 770 } 771 char* end; 772 errno = 0; 773 double v = strtod(value, &end); 774 if ((errno != 0) || (*end != 0)) { 775 return false; 776 } 777 if (g_isnan(v) || !g_isfinite(v)) { 778 // Currently we cannot handle these special values. 779 return false; 780 } 781 782 if (JVMFlagAccess::set_double(flag, &v, origin) == JVMFlag::SUCCESS) { 783 return true; 784 } 785 return false; 786 } 787 788 static bool set_numeric_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 789 JVMFlag::Error result = JVMFlag::WRONG_FORMAT; 790 791 if (flag->is_int()) { 792 int v; 793 if (parse_integer(value, &v)) { 794 result = JVMFlagAccess::set_int(flag, &v, origin); 795 } 796 } else if (flag->is_uint()) { 797 uint v; 798 if (parse_integer(value, &v)) { 799 result = JVMFlagAccess::set_uint(flag, &v, origin); 800 } 801 } else if (flag->is_intx()) { 802 intx v; 803 if (parse_integer(value, &v)) { 804 result = JVMFlagAccess::set_intx(flag, &v, origin); 805 } 806 } else if (flag->is_uintx()) { 807 uintx v; 808 if (parse_integer(value, &v)) { 809 result = JVMFlagAccess::set_uintx(flag, &v, origin); 810 } 811 } else if (flag->is_uint64_t()) { 812 uint64_t v; 813 if (parse_integer(value, &v)) { 814 result = JVMFlagAccess::set_uint64_t(flag, &v, origin); 815 } 816 } else if (flag->is_size_t()) { 817 size_t v; 818 if (parse_integer(value, &v)) { 819 result = JVMFlagAccess::set_size_t(flag, &v, origin); 820 } 821 } 822 823 return result == JVMFlag::SUCCESS; 824 } 825 826 static bool set_string_flag(JVMFlag* flag, const char* value, JVMFlagOrigin origin) { 827 if (value[0] == '\0') { 828 value = nullptr; 829 } 830 if (JVMFlagAccess::set_ccstr(flag, &value, origin) != JVMFlag::SUCCESS) return false; 831 // Contract: JVMFlag always returns a pointer that needs freeing. 832 FREE_C_HEAP_ARRAY(char, value); 833 return true; 834 } 835 836 static bool append_to_string_flag(JVMFlag* flag, const char* new_value, JVMFlagOrigin origin) { 837 const char* old_value = ""; 838 if (JVMFlagAccess::get_ccstr(flag, &old_value) != JVMFlag::SUCCESS) return false; 839 size_t old_len = old_value != nullptr ? strlen(old_value) : 0; 840 size_t new_len = strlen(new_value); 841 const char* value; 842 char* free_this_too = nullptr; 843 if (old_len == 0) { 844 value = new_value; 845 } else if (new_len == 0) { 846 value = old_value; 847 } else { 848 size_t length = old_len + 1 + new_len + 1; 849 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 850 // each new setting adds another LINE to the switch: 851 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 852 value = buf; 853 free_this_too = buf; 854 } 855 (void) JVMFlagAccess::set_ccstr(flag, &value, origin); 856 // JVMFlag always returns a pointer that needs freeing. 857 FREE_C_HEAP_ARRAY(char, value); 858 // JVMFlag made its own copy, so I must delete my own temp. buffer. 859 FREE_C_HEAP_ARRAY(char, free_this_too); 860 return true; 861 } 862 863 const char* Arguments::handle_aliases_and_deprecation(const char* arg) { 864 const char* real_name = real_flag_name(arg); 865 JDK_Version since = JDK_Version(); 866 switch (is_deprecated_flag(arg, &since)) { 867 case -1: { 868 // Obsolete or expired, so don't process normally, 869 // but allow for an obsolete flag we're still 870 // temporarily allowing. 871 if (!is_obsolete_flag(arg, &since)) { 872 return real_name; 873 } 874 // Note if we're not considered obsolete then we can't be expired either 875 // as obsoletion must come first. 876 return nullptr; 877 } 878 case 0: 879 return real_name; 880 case 1: { 881 char version[256]; 882 since.to_string(version, sizeof(version)); 883 if (real_name != arg) { 884 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 885 arg, version, real_name); 886 } else { 887 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 888 arg, version); 889 } 890 return real_name; 891 } 892 } 893 ShouldNotReachHere(); 894 return nullptr; 895 } 896 897 #define BUFLEN 255 898 899 JVMFlag* Arguments::find_jvm_flag(const char* name, size_t name_length) { 900 char name_copied[BUFLEN+1]; 901 if (name[name_length] != 0) { 902 if (name_length > BUFLEN) { 903 return nullptr; 904 } else { 905 strncpy(name_copied, name, name_length); 906 name_copied[name_length] = '\0'; 907 name = name_copied; 908 } 909 } 910 911 const char* real_name = Arguments::handle_aliases_and_deprecation(name); 912 if (real_name == nullptr) { 913 return nullptr; 914 } 915 JVMFlag* flag = JVMFlag::find_flag(real_name); 916 return flag; 917 } 918 919 bool Arguments::parse_argument(const char* arg, JVMFlagOrigin origin) { 920 bool is_bool = false; 921 bool bool_val = false; 922 char c = *arg; 923 if (c == '+' || c == '-') { 924 is_bool = true; 925 bool_val = (c == '+'); 926 arg++; 927 } 928 929 const char* name = arg; 930 while (true) { 931 c = *arg; 932 if (isalnum(c) || (c == '_')) { 933 ++arg; 934 } else { 935 break; 936 } 937 } 938 939 size_t name_len = size_t(arg - name); 940 if (name_len == 0) { 941 return false; 942 } 943 944 JVMFlag* flag = find_jvm_flag(name, name_len); 945 if (flag == nullptr) { 946 return false; 947 } 948 949 if (is_bool) { 950 if (*arg != 0) { 951 // Error -- extra characters such as -XX:+BoolFlag=123 952 return false; 953 } 954 return set_bool_flag(flag, bool_val, origin); 955 } 956 957 if (arg[0] == '=') { 958 const char* value = arg + 1; 959 if (flag->is_ccstr()) { 960 if (flag->ccstr_accumulates()) { 961 return append_to_string_flag(flag, value, origin); 962 } else { 963 return set_string_flag(flag, value, origin); 964 } 965 } else if (flag->is_double()) { 966 return set_fp_numeric_flag(flag, value, origin); 967 } else { 968 return set_numeric_flag(flag, value, origin); 969 } 970 } 971 972 if (arg[0] == ':' && arg[1] == '=') { 973 // -XX:Foo:=xxx will reset the string flag to the given value. 974 const char* value = arg + 2; 975 return set_string_flag(flag, value, origin); 976 } 977 978 return false; 979 } 980 981 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 982 assert(bldarray != nullptr, "illegal argument"); 983 984 if (arg == nullptr) { 985 return; 986 } 987 988 int new_count = *count + 1; 989 990 // expand the array and add arg to the last element 991 if (*bldarray == nullptr) { 992 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 993 } else { 994 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 995 } 996 (*bldarray)[*count] = os::strdup_check_oom(arg); 997 *count = new_count; 998 } 999 1000 void Arguments::build_jvm_args(const char* arg) { 1001 add_string(&_jvm_args_array, &_num_jvm_args, arg); 1002 } 1003 1004 void Arguments::build_jvm_flags(const char* arg) { 1005 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 1006 } 1007 1008 // utility function to return a string that concatenates all 1009 // strings in a given char** array 1010 const char* Arguments::build_resource_string(char** args, int count) { 1011 if (args == nullptr || count == 0) { 1012 return nullptr; 1013 } 1014 size_t length = 0; 1015 for (int i = 0; i < count; i++) { 1016 length += strlen(args[i]) + 1; // add 1 for a space or null terminating character 1017 } 1018 char* s = NEW_RESOURCE_ARRAY(char, length); 1019 char* dst = s; 1020 for (int j = 0; j < count; j++) { 1021 size_t offset = strlen(args[j]) + 1; // add 1 for a space or null terminating character 1022 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with null character 1023 dst += offset; 1024 length -= offset; 1025 } 1026 return (const char*) s; 1027 } 1028 1029 void Arguments::print_on(outputStream* st) { 1030 st->print_cr("VM Arguments:"); 1031 if (num_jvm_flags() > 0) { 1032 st->print("jvm_flags: "); print_jvm_flags_on(st); 1033 st->cr(); 1034 } 1035 if (num_jvm_args() > 0) { 1036 st->print("jvm_args: "); print_jvm_args_on(st); 1037 st->cr(); 1038 } 1039 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1040 if (_java_class_path != nullptr) { 1041 char* path = _java_class_path->value(); 1042 size_t len = strlen(path); 1043 st->print("java_class_path (initial): "); 1044 // Avoid using st->print_cr() because path length maybe longer than O_BUFLEN. 1045 if (len == 0) { 1046 st->print_raw_cr("<not set>"); 1047 } else { 1048 st->print_raw_cr(path, len); 1049 } 1050 } 1051 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1052 } 1053 1054 void Arguments::print_summary_on(outputStream* st) { 1055 // Print the command line. Environment variables that are helpful for 1056 // reproducing the problem are written later in the hs_err file. 1057 // flags are from setting file 1058 if (num_jvm_flags() > 0) { 1059 st->print_raw("Settings File: "); 1060 print_jvm_flags_on(st); 1061 st->cr(); 1062 } 1063 // args are the command line and environment variable arguments. 1064 st->print_raw("Command Line: "); 1065 if (num_jvm_args() > 0) { 1066 print_jvm_args_on(st); 1067 } 1068 // this is the classfile and any arguments to the java program 1069 if (java_command() != nullptr) { 1070 st->print("%s", java_command()); 1071 } 1072 st->cr(); 1073 } 1074 1075 void Arguments::print_jvm_flags_on(outputStream* st) { 1076 if (_num_jvm_flags > 0) { 1077 for (int i=0; i < _num_jvm_flags; i++) { 1078 st->print("%s ", _jvm_flags_array[i]); 1079 } 1080 } 1081 } 1082 1083 void Arguments::print_jvm_args_on(outputStream* st) { 1084 if (_num_jvm_args > 0) { 1085 for (int i=0; i < _num_jvm_args; i++) { 1086 st->print("%s ", _jvm_args_array[i]); 1087 } 1088 } 1089 } 1090 1091 bool Arguments::process_argument(const char* arg, 1092 jboolean ignore_unrecognized, 1093 JVMFlagOrigin origin) { 1094 JDK_Version since = JDK_Version(); 1095 1096 if (parse_argument(arg, origin)) { 1097 return true; 1098 } 1099 1100 // Determine if the flag has '+', '-', or '=' characters. 1101 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1102 const char* const argname = has_plus_minus ? arg + 1 : arg; 1103 1104 size_t arg_len; 1105 const char* equal_sign = strchr(argname, '='); 1106 if (equal_sign == nullptr) { 1107 arg_len = strlen(argname); 1108 } else { 1109 arg_len = equal_sign - argname; 1110 } 1111 1112 // Only make the obsolete check for valid arguments. 1113 if (arg_len <= BUFLEN) { 1114 // Construct a string which consists only of the argument name without '+', '-', or '='. 1115 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1116 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1117 if (is_obsolete_flag(stripped_argname, &since)) { 1118 char version[256]; 1119 since.to_string(version, sizeof(version)); 1120 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1121 return true; 1122 } 1123 } 1124 1125 // For locked flags, report a custom error message if available. 1126 // Otherwise, report the standard unrecognized VM option. 1127 const JVMFlag* found_flag = JVMFlag::find_declared_flag((const char*)argname, arg_len); 1128 if (found_flag != nullptr) { 1129 char locked_message_buf[BUFLEN]; 1130 JVMFlag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1131 if (strlen(locked_message_buf) != 0) { 1132 #ifdef PRODUCT 1133 bool mismatched = msg_type == JVMFlag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD; 1134 if (ignore_unrecognized && mismatched) { 1135 return true; 1136 } 1137 #endif 1138 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1139 } 1140 if (found_flag->is_bool() && !has_plus_minus) { 1141 jio_fprintf(defaultStream::error_stream(), 1142 "Missing +/- setting for VM option '%s'\n", argname); 1143 } else if (!found_flag->is_bool() && has_plus_minus) { 1144 jio_fprintf(defaultStream::error_stream(), 1145 "Unexpected +/- setting in VM option '%s'\n", argname); 1146 } else { 1147 jio_fprintf(defaultStream::error_stream(), 1148 "Improperly specified VM option '%s'\n", argname); 1149 } 1150 } else { 1151 if (ignore_unrecognized) { 1152 return true; 1153 } 1154 jio_fprintf(defaultStream::error_stream(), 1155 "Unrecognized VM option '%s'\n", argname); 1156 JVMFlag* fuzzy_matched = JVMFlag::fuzzy_match((const char*)argname, arg_len, true); 1157 if (fuzzy_matched != nullptr) { 1158 jio_fprintf(defaultStream::error_stream(), 1159 "Did you mean '%s%s%s'?\n", 1160 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1161 fuzzy_matched->name(), 1162 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1163 } 1164 } 1165 1166 // allow for commandline "commenting out" options like -XX:#+Verbose 1167 return arg[0] == '#'; 1168 } 1169 1170 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1171 FILE* stream = os::fopen(file_name, "rb"); 1172 if (stream == nullptr) { 1173 if (should_exist) { 1174 jio_fprintf(defaultStream::error_stream(), 1175 "Could not open settings file %s\n", file_name); 1176 return false; 1177 } else { 1178 return true; 1179 } 1180 } 1181 1182 char token[1024]; 1183 int pos = 0; 1184 1185 bool in_white_space = true; 1186 bool in_comment = false; 1187 bool in_quote = false; 1188 int quote_c = 0; 1189 bool result = true; 1190 1191 int c = getc(stream); 1192 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1193 if (in_white_space) { 1194 if (in_comment) { 1195 if (c == '\n') in_comment = false; 1196 } else { 1197 if (c == '#') in_comment = true; 1198 else if (!isspace((unsigned char) c)) { 1199 in_white_space = false; 1200 token[pos++] = checked_cast<char>(c); 1201 } 1202 } 1203 } else { 1204 if (c == '\n' || (!in_quote && isspace((unsigned char) c))) { 1205 // token ends at newline, or at unquoted whitespace 1206 // this allows a way to include spaces in string-valued options 1207 token[pos] = '\0'; 1208 logOption(token); 1209 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1210 build_jvm_flags(token); 1211 pos = 0; 1212 in_white_space = true; 1213 in_quote = false; 1214 } else if (!in_quote && (c == '\'' || c == '"')) { 1215 in_quote = true; 1216 quote_c = c; 1217 } else if (in_quote && (c == quote_c)) { 1218 in_quote = false; 1219 } else { 1220 token[pos++] = checked_cast<char>(c); 1221 } 1222 } 1223 c = getc(stream); 1224 } 1225 if (pos > 0) { 1226 token[pos] = '\0'; 1227 result &= process_argument(token, ignore_unrecognized, JVMFlagOrigin::CONFIG_FILE); 1228 build_jvm_flags(token); 1229 } 1230 fclose(stream); 1231 return result; 1232 } 1233 1234 //============================================================================================================= 1235 // Parsing of properties (-D) 1236 1237 const char* Arguments::get_property(const char* key) { 1238 return PropertyList_get_value(system_properties(), key); 1239 } 1240 1241 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1242 const char* eq = strchr(prop, '='); 1243 const char* key; 1244 const char* value = ""; 1245 1246 if (eq == nullptr) { 1247 // property doesn't have a value, thus use passed string 1248 key = prop; 1249 } else { 1250 // property have a value, thus extract it and save to the 1251 // allocated string 1252 size_t key_len = eq - prop; 1253 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1254 1255 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1256 key = tmp_key; 1257 1258 value = &prop[key_len + 1]; 1259 } 1260 1261 if (internal == ExternalProperty) { 1262 CDSConfig::check_incompatible_property(key, value); 1263 } 1264 1265 if (strcmp(key, "java.compiler") == 0) { 1266 // we no longer support java.compiler system property, log a warning and let it get 1267 // passed to Java, like any other system property 1268 if (strlen(value) == 0 || strcasecmp(value, "NONE") == 0) { 1269 // for applications using NONE or empty value, log a more informative message 1270 warning("The java.compiler system property is obsolete and no longer supported, use -Xint"); 1271 } else { 1272 warning("The java.compiler system property is obsolete and no longer supported."); 1273 } 1274 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0) { 1275 // sun.java.launcher.is_altjvm property is 1276 // private and is processed in process_sun_java_launcher_properties(); 1277 // the sun.java.launcher property is passed on to the java application 1278 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1279 // append is true, writable is true, internal is false 1280 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1281 WriteableProperty, ExternalProperty); 1282 } else { 1283 if (strcmp(key, "sun.java.command") == 0) { 1284 char *old_java_command = _java_command; 1285 _java_command = os::strdup_check_oom(value, mtArguments); 1286 if (old_java_command != nullptr) { 1287 os::free(old_java_command); 1288 } 1289 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1290 // If this property is set on the command line then its value will be 1291 // displayed in VM error logs as the URL at which to submit such logs. 1292 // Normally the URL displayed in error logs is different from the value 1293 // of this system property, so a different property should have been 1294 // used here, but we leave this as-is in case someone depends upon it. 1295 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1296 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1297 // its value without going through the property list or making a Java call. 1298 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1299 if (old_java_vendor_url_bug != nullptr) { 1300 os::free((void *)old_java_vendor_url_bug); 1301 } 1302 } 1303 1304 // Create new property and add at the end of the list 1305 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1306 } 1307 1308 if (key != prop) { 1309 // SystemProperty copy passed value, thus free previously allocated 1310 // memory 1311 FreeHeap((void *)key); 1312 } 1313 1314 return true; 1315 } 1316 1317 //=========================================================================================================== 1318 // Setting int/mixed/comp mode flags 1319 1320 void Arguments::set_mode_flags(Mode mode) { 1321 // Set up default values for all flags. 1322 // If you add a flag to any of the branches below, 1323 // add a default value for it here. 1324 _mode = mode; 1325 1326 // Ensure Agent_OnLoad has the correct initial values. 1327 // This may not be the final mode; mode may change later in onload phase. 1328 PropertyList_unique_add(&_system_properties, "java.vm.info", 1329 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1330 1331 UseInterpreter = true; 1332 UseCompiler = true; 1333 UseLoopCounter = true; 1334 1335 // Default values may be platform/compiler dependent - 1336 // use the saved values 1337 ClipInlining = Arguments::_ClipInlining; 1338 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1339 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1340 BackgroundCompilation = Arguments::_BackgroundCompilation; 1341 1342 // Change from defaults based on mode 1343 switch (mode) { 1344 default: 1345 ShouldNotReachHere(); 1346 break; 1347 case _int: 1348 UseCompiler = false; 1349 UseLoopCounter = false; 1350 AlwaysCompileLoopMethods = false; 1351 UseOnStackReplacement = false; 1352 break; 1353 case _mixed: 1354 // same as default 1355 break; 1356 case _comp: 1357 UseInterpreter = false; 1358 BackgroundCompilation = false; 1359 ClipInlining = false; 1360 break; 1361 } 1362 } 1363 1364 // Conflict: required to use shared spaces (-Xshare:on), but 1365 // incompatible command line options were chosen. 1366 void Arguments::no_shared_spaces(const char* message) { 1367 if (RequireSharedSpaces) { 1368 jio_fprintf(defaultStream::error_stream(), 1369 "Class data sharing is inconsistent with other specified options.\n"); 1370 vm_exit_during_initialization("Unable to use shared archive", message); 1371 } else { 1372 log_info(cds)("Unable to use shared archive: %s", message); 1373 UseSharedSpaces = false; 1374 } 1375 } 1376 1377 static void set_object_alignment() { 1378 // Object alignment. 1379 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1380 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1381 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1382 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1383 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1384 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1385 1386 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1387 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1388 1389 // Oop encoding heap max 1390 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1391 } 1392 1393 size_t Arguments::max_heap_for_compressed_oops() { 1394 // Avoid sign flip. 1395 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1396 // We need to fit both the null page and the heap into the memory budget, while 1397 // keeping alignment constraints of the heap. To guarantee the latter, as the 1398 // null page is located before the heap, we pad the null page to the conservative 1399 // maximum alignment that the GC may ever impose upon the heap. 1400 size_t displacement_due_to_null_page = align_up(os::vm_page_size(), 1401 _conservative_max_heap_alignment); 1402 1403 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1404 NOT_LP64(ShouldNotReachHere(); return 0); 1405 } 1406 1407 void Arguments::set_use_compressed_oops() { 1408 #ifdef _LP64 1409 // MaxHeapSize is not set up properly at this point, but 1410 // the only value that can override MaxHeapSize if we are 1411 // to use UseCompressedOops are InitialHeapSize and MinHeapSize. 1412 size_t max_heap_size = MAX3(MaxHeapSize, InitialHeapSize, MinHeapSize); 1413 1414 if (max_heap_size <= max_heap_for_compressed_oops()) { 1415 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1416 FLAG_SET_ERGO(UseCompressedOops, true); 1417 } 1418 } else { 1419 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1420 warning("Max heap size too large for Compressed Oops"); 1421 FLAG_SET_DEFAULT(UseCompressedOops, false); 1422 } 1423 } 1424 #endif // _LP64 1425 } 1426 1427 void Arguments::set_conservative_max_heap_alignment() { 1428 // The conservative maximum required alignment for the heap is the maximum of 1429 // the alignments imposed by several sources: any requirements from the heap 1430 // itself and the maximum page size we may run the VM with. 1431 size_t heap_alignment = GCConfig::arguments()->conservative_max_heap_alignment(); 1432 _conservative_max_heap_alignment = MAX4(heap_alignment, 1433 os::vm_allocation_granularity(), 1434 os::max_page_size(), 1435 GCArguments::compute_heap_alignment()); 1436 } 1437 1438 jint Arguments::set_ergonomics_flags() { 1439 GCConfig::initialize(); 1440 1441 set_conservative_max_heap_alignment(); 1442 1443 #ifdef _LP64 1444 set_use_compressed_oops(); 1445 1446 // Also checks that certain machines are slower with compressed oops 1447 // in vm_version initialization code. 1448 #endif // _LP64 1449 1450 return JNI_OK; 1451 } 1452 1453 size_t Arguments::limit_heap_by_allocatable_memory(size_t limit) { 1454 size_t max_allocatable; 1455 size_t result = limit; 1456 if (os::has_allocatable_memory_limit(&max_allocatable)) { 1457 // The AggressiveHeap check is a temporary workaround to avoid calling 1458 // GCarguments::heap_virtual_to_physical_ratio() before a GC has been 1459 // selected. This works because AggressiveHeap implies UseParallelGC 1460 // where we know the ratio will be 1. Once the AggressiveHeap option is 1461 // removed, this can be cleaned up. 1462 size_t heap_virtual_to_physical_ratio = (AggressiveHeap ? 1 : GCConfig::arguments()->heap_virtual_to_physical_ratio()); 1463 size_t fraction = MaxVirtMemFraction * heap_virtual_to_physical_ratio; 1464 result = MIN2(result, max_allocatable / fraction); 1465 } 1466 return result; 1467 } 1468 1469 // Use static initialization to get the default before parsing 1470 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 1471 1472 void Arguments::set_heap_size() { 1473 julong phys_mem; 1474 1475 // If the user specified one of these options, they 1476 // want specific memory sizing so do not limit memory 1477 // based on compressed oops addressability. 1478 // Also, memory limits will be calculated based on 1479 // available os physical memory, not our MaxRAM limit, 1480 // unless MaxRAM is also specified. 1481 bool override_coop_limit = (!FLAG_IS_DEFAULT(MaxRAMPercentage) || 1482 !FLAG_IS_DEFAULT(MinRAMPercentage) || 1483 !FLAG_IS_DEFAULT(InitialRAMPercentage) || 1484 !FLAG_IS_DEFAULT(MaxRAM)); 1485 if (override_coop_limit) { 1486 if (FLAG_IS_DEFAULT(MaxRAM)) { 1487 phys_mem = os::physical_memory(); 1488 FLAG_SET_ERGO(MaxRAM, (uint64_t)phys_mem); 1489 } else { 1490 phys_mem = (julong)MaxRAM; 1491 } 1492 } else { 1493 phys_mem = FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 1494 : (julong)MaxRAM; 1495 } 1496 1497 // If the maximum heap size has not been set with -Xmx, 1498 // then set it as fraction of the size of physical memory, 1499 // respecting the maximum and minimum sizes of the heap. 1500 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1501 julong reasonable_max = (julong)(((double)phys_mem * MaxRAMPercentage) / 100); 1502 const julong reasonable_min = (julong)(((double)phys_mem * MinRAMPercentage) / 100); 1503 if (reasonable_min < MaxHeapSize) { 1504 // Small physical memory, so use a minimum fraction of it for the heap 1505 reasonable_max = reasonable_min; 1506 } else { 1507 // Not-small physical memory, so require a heap at least 1508 // as large as MaxHeapSize 1509 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 1510 } 1511 1512 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 1513 // Limit the heap size to ErgoHeapSizeLimit 1514 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 1515 } 1516 1517 reasonable_max = limit_heap_by_allocatable_memory(reasonable_max); 1518 1519 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 1520 // An initial heap size was specified on the command line, 1521 // so be sure that the maximum size is consistent. Done 1522 // after call to limit_heap_by_allocatable_memory because that 1523 // method might reduce the allocation size. 1524 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 1525 } else if (!FLAG_IS_DEFAULT(MinHeapSize)) { 1526 reasonable_max = MAX2(reasonable_max, (julong)MinHeapSize); 1527 } 1528 1529 #ifdef _LP64 1530 if (UseCompressedOops || UseCompressedClassPointers) { 1531 // HeapBaseMinAddress can be greater than default but not less than. 1532 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 1533 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 1534 // matches compressed oops printing flags 1535 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least %zu" 1536 " (%zuG) which is greater than value given %zu", 1537 DefaultHeapBaseMinAddress, 1538 DefaultHeapBaseMinAddress/G, 1539 HeapBaseMinAddress); 1540 FLAG_SET_ERGO(HeapBaseMinAddress, DefaultHeapBaseMinAddress); 1541 } 1542 } 1543 } 1544 if (UseCompressedOops) { 1545 // Limit the heap size to the maximum possible when using compressed oops 1546 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 1547 1548 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 1549 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 1550 // but it should be not less than default MaxHeapSize. 1551 max_coop_heap -= HeapBaseMinAddress; 1552 } 1553 1554 // If user specified flags prioritizing os physical 1555 // memory limits, then disable compressed oops if 1556 // limits exceed max_coop_heap and UseCompressedOops 1557 // was not specified. 1558 if (reasonable_max > max_coop_heap) { 1559 if (FLAG_IS_ERGO(UseCompressedOops) && override_coop_limit) { 1560 log_info(cds)("UseCompressedOops and UseCompressedClassPointers have been disabled due to" 1561 " max heap %zu > compressed oop heap %zu. " 1562 "Please check the setting of MaxRAMPercentage %5.2f." 1563 ,(size_t)reasonable_max, (size_t)max_coop_heap, MaxRAMPercentage); 1564 FLAG_SET_ERGO(UseCompressedOops, false); 1565 } else { 1566 reasonable_max = MIN2(reasonable_max, max_coop_heap); 1567 } 1568 } 1569 } 1570 #endif // _LP64 1571 1572 log_trace(gc, heap)(" Maximum heap size %zu", (size_t) reasonable_max); 1573 FLAG_SET_ERGO(MaxHeapSize, (size_t)reasonable_max); 1574 } 1575 1576 // If the minimum or initial heap_size have not been set or requested to be set 1577 // ergonomically, set them accordingly. 1578 if (InitialHeapSize == 0 || MinHeapSize == 0) { 1579 julong reasonable_minimum = (julong)(OldSize + NewSize); 1580 1581 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 1582 1583 reasonable_minimum = limit_heap_by_allocatable_memory(reasonable_minimum); 1584 1585 if (InitialHeapSize == 0) { 1586 julong reasonable_initial = (julong)(((double)phys_mem * InitialRAMPercentage) / 100); 1587 reasonable_initial = limit_heap_by_allocatable_memory(reasonable_initial); 1588 1589 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)MinHeapSize); 1590 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 1591 1592 FLAG_SET_ERGO(InitialHeapSize, (size_t)reasonable_initial); 1593 log_trace(gc, heap)(" Initial heap size %zu", InitialHeapSize); 1594 } 1595 // If the minimum heap size has not been set (via -Xms or -XX:MinHeapSize), 1596 // synchronize with InitialHeapSize to avoid errors with the default value. 1597 if (MinHeapSize == 0) { 1598 FLAG_SET_ERGO(MinHeapSize, MIN2((size_t)reasonable_minimum, InitialHeapSize)); 1599 log_trace(gc, heap)(" Minimum heap size %zu", MinHeapSize); 1600 } 1601 } 1602 } 1603 1604 // This option inspects the machine and attempts to set various 1605 // parameters to be optimal for long-running, memory allocation 1606 // intensive jobs. It is intended for machines with large 1607 // amounts of cpu and memory. 1608 jint Arguments::set_aggressive_heap_flags() { 1609 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 1610 // VM, but we may not be able to represent the total physical memory 1611 // available (like having 8gb of memory on a box but using a 32bit VM). 1612 // Thus, we need to make sure we're using a julong for intermediate 1613 // calculations. 1614 julong initHeapSize; 1615 julong total_memory = os::physical_memory(); 1616 1617 if (total_memory < (julong) 256 * M) { 1618 jio_fprintf(defaultStream::error_stream(), 1619 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 1620 vm_exit(1); 1621 } 1622 1623 // The heap size is half of available memory, or (at most) 1624 // all of possible memory less 160mb (leaving room for the OS 1625 // when using ISM). This is the maximum; because adaptive sizing 1626 // is turned on below, the actual space used may be smaller. 1627 1628 initHeapSize = MIN2(total_memory / (julong) 2, 1629 total_memory - (julong) 160 * M); 1630 1631 initHeapSize = limit_heap_by_allocatable_memory(initHeapSize); 1632 1633 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 1634 if (FLAG_SET_CMDLINE(MaxHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1635 return JNI_EINVAL; 1636 } 1637 if (FLAG_SET_CMDLINE(InitialHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1638 return JNI_EINVAL; 1639 } 1640 if (FLAG_SET_CMDLINE(MinHeapSize, initHeapSize) != JVMFlag::SUCCESS) { 1641 return JNI_EINVAL; 1642 } 1643 } 1644 if (FLAG_IS_DEFAULT(NewSize)) { 1645 // Make the young generation 3/8ths of the total heap. 1646 if (FLAG_SET_CMDLINE(NewSize, 1647 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != JVMFlag::SUCCESS) { 1648 return JNI_EINVAL; 1649 } 1650 if (FLAG_SET_CMDLINE(MaxNewSize, NewSize) != JVMFlag::SUCCESS) { 1651 return JNI_EINVAL; 1652 } 1653 } 1654 1655 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 1656 FLAG_SET_DEFAULT(UseLargePages, true); 1657 #endif 1658 1659 // Increase some data structure sizes for efficiency 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=%zd", 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 static unsigned int addreads_count = 0; 1766 static unsigned int addexports_count = 0; 1767 static unsigned int addopens_count = 0; 1768 static unsigned int enable_native_access_count = 0; 1769 static bool patch_mod_javabase = false; 1770 1771 // Check the consistency of vm_init_args 1772 bool Arguments::check_vm_args_consistency() { 1773 // This may modify compiler flags. Must be called before CompilerConfig::check_args_consistency() 1774 if (!CDSConfig::check_vm_args_consistency(mode_flag_cmd_line)) { 1775 return false; 1776 } 1777 1778 // Method for adding checks for flag consistency. 1779 // The intent is to warn the user of all possible conflicts, 1780 // before returning an error. 1781 // Note: Needs platform-dependent factoring. 1782 bool status = true; 1783 1784 if (TLABRefillWasteFraction == 0) { 1785 jio_fprintf(defaultStream::error_stream(), 1786 "TLABRefillWasteFraction should be a denominator, " 1787 "not %zu\n", 1788 TLABRefillWasteFraction); 1789 status = false; 1790 } 1791 1792 status = CompilerConfig::check_args_consistency(status); 1793 #if INCLUDE_JVMCI 1794 if (status && EnableJVMCI) { 1795 PropertyList_unique_add(&_system_properties, "jdk.internal.vm.ci.enabled", "true", 1796 AddProperty, UnwriteableProperty, InternalProperty); 1797 if (ClassLoader::is_module_observable("jdk.internal.vm.ci")) { 1798 if (!create_numbered_module_property("jdk.module.addmods", "jdk.internal.vm.ci", _addmods_count++)) { 1799 return false; 1800 } 1801 } 1802 } 1803 #endif 1804 1805 #if INCLUDE_JFR 1806 if (status && (FlightRecorderOptions || StartFlightRecording)) { 1807 if (!create_numbered_module_property("jdk.module.addmods", "jdk.jfr", _addmods_count++)) { 1808 return false; 1809 } 1810 } 1811 #endif 1812 1813 #ifndef SUPPORT_RESERVED_STACK_AREA 1814 if (StackReservedPages != 0) { 1815 FLAG_SET_CMDLINE(StackReservedPages, 0); 1816 warning("Reserved Stack Area not supported on this platform"); 1817 } 1818 #endif 1819 1820 #ifndef _LP64 1821 if (LockingMode == LM_LEGACY) { 1822 FLAG_SET_CMDLINE(LockingMode, LM_LIGHTWEIGHT); 1823 // Self-forwarding in bit 3 of the mark-word conflicts 1824 // with 4-byte-aligned stack-locks. 1825 warning("Legacy locking not supported on this platform"); 1826 } 1827 #endif 1828 1829 if (UseObjectMonitorTable && LockingMode != LM_LIGHTWEIGHT) { 1830 // ObjectMonitorTable requires lightweight locking. 1831 FLAG_SET_CMDLINE(UseObjectMonitorTable, false); 1832 warning("UseObjectMonitorTable requires LM_LIGHTWEIGHT"); 1833 } 1834 1835 #if !defined(X86) && !defined(AARCH64) && !defined(PPC64) && !defined(RISCV64) && !defined(S390) 1836 if (LockingMode == LM_MONITOR) { 1837 jio_fprintf(defaultStream::error_stream(), 1838 "LockingMode == 0 (LM_MONITOR) is not fully implemented on this architecture\n"); 1839 return false; 1840 } 1841 #endif 1842 if (VerifyHeavyMonitors && LockingMode != LM_MONITOR) { 1843 jio_fprintf(defaultStream::error_stream(), 1844 "-XX:+VerifyHeavyMonitors requires LockingMode == 0 (LM_MONITOR)\n"); 1845 return false; 1846 } 1847 return status; 1848 } 1849 1850 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 1851 const char* option_type) { 1852 if (ignore) return false; 1853 1854 const char* spacer = " "; 1855 if (option_type == nullptr) { 1856 option_type = ++spacer; // Set both to the empty string. 1857 } 1858 1859 jio_fprintf(defaultStream::error_stream(), 1860 "Unrecognized %s%soption: %s\n", option_type, spacer, 1861 option->optionString); 1862 return true; 1863 } 1864 1865 static const char* user_assertion_options[] = { 1866 "-da", "-ea", "-disableassertions", "-enableassertions", nullptr 1867 }; 1868 1869 static const char* system_assertion_options[] = { 1870 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", nullptr 1871 }; 1872 1873 bool Arguments::parse_uint(const char* value, 1874 uint* uint_arg, 1875 uint min_size) { 1876 uint n; 1877 if (!parse_integer(value, &n)) { 1878 return false; 1879 } 1880 if (n >= min_size) { 1881 *uint_arg = n; 1882 return true; 1883 } else { 1884 return false; 1885 } 1886 } 1887 1888 bool Arguments::create_module_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 1889 assert(is_internal_module_property(prop_name), "unknown module property: '%s'", prop_name); 1890 CDSConfig::check_internal_module_property(prop_name, prop_value); 1891 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 1892 char* property = AllocateHeap(prop_len, mtArguments); 1893 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 1894 if (ret < 0 || ret >= (int)prop_len) { 1895 FreeHeap(property); 1896 return false; 1897 } 1898 // These are not strictly writeable properties as they cannot be set via -Dprop=val. But that 1899 // is enforced by checking is_internal_module_property(). We need the property to be writeable so 1900 // that multiple occurrences of the associated flag just causes the existing property value to be 1901 // replaced ("last option wins"). Otherwise we would need to keep track of the flags and only convert 1902 // to a property after we have finished flag processing. 1903 bool added = add_property(property, WriteableProperty, internal); 1904 FreeHeap(property); 1905 return added; 1906 } 1907 1908 bool Arguments::create_numbered_module_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 1909 assert(is_internal_module_property(prop_base_name), "unknown module property: '%s'", prop_base_name); 1910 CDSConfig::check_internal_module_property(prop_base_name, prop_value); 1911 const unsigned int props_count_limit = 1000; 1912 const int max_digits = 3; 1913 const int extra_symbols_count = 3; // includes '.', '=', '\0' 1914 1915 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 1916 if (count < props_count_limit) { 1917 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + max_digits + extra_symbols_count; 1918 char* property = AllocateHeap(prop_len, mtArguments); 1919 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 1920 if (ret < 0 || ret >= (int)prop_len) { 1921 FreeHeap(property); 1922 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 1923 return false; 1924 } 1925 bool added = add_property(property, UnwriteableProperty, InternalProperty); 1926 FreeHeap(property); 1927 return added; 1928 } 1929 1930 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 1931 return false; 1932 } 1933 1934 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 1935 julong* long_arg, 1936 julong min_size, 1937 julong max_size) { 1938 if (!parse_integer(s, long_arg)) return arg_unreadable; 1939 return check_memory_size(*long_arg, min_size, max_size); 1940 } 1941 1942 // Parse JavaVMInitArgs structure 1943 1944 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *vm_options_args, 1945 const JavaVMInitArgs *java_tool_options_args, 1946 const JavaVMInitArgs *java_options_args, 1947 const JavaVMInitArgs *cmd_line_args) { 1948 // Save default settings for some mode flags 1949 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 1950 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 1951 Arguments::_ClipInlining = ClipInlining; 1952 Arguments::_BackgroundCompilation = BackgroundCompilation; 1953 1954 // Remember the default value of SharedBaseAddress. 1955 Arguments::_default_SharedBaseAddress = SharedBaseAddress; 1956 1957 // Setup flags for mixed which is the default 1958 set_mode_flags(_mixed); 1959 1960 // Parse args structure generated from java.base vm options resource 1961 jint result = parse_each_vm_init_arg(vm_options_args, JVMFlagOrigin::JIMAGE_RESOURCE); 1962 if (result != JNI_OK) { 1963 return result; 1964 } 1965 1966 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 1967 // variable (if present). 1968 result = parse_each_vm_init_arg(java_tool_options_args, JVMFlagOrigin::ENVIRON_VAR); 1969 if (result != JNI_OK) { 1970 return result; 1971 } 1972 1973 // Parse args structure generated from the command line flags. 1974 result = parse_each_vm_init_arg(cmd_line_args, JVMFlagOrigin::COMMAND_LINE); 1975 if (result != JNI_OK) { 1976 return result; 1977 } 1978 1979 // Parse args structure generated from the _JAVA_OPTIONS environment 1980 // variable (if present) (mimics classic VM) 1981 result = parse_each_vm_init_arg(java_options_args, JVMFlagOrigin::ENVIRON_VAR); 1982 if (result != JNI_OK) { 1983 return result; 1984 } 1985 1986 // Disable CDS for exploded image 1987 if (!has_jimage()) { 1988 no_shared_spaces("CDS disabled on exploded JDK"); 1989 } 1990 1991 // We need to ensure processor and memory resources have been properly 1992 // configured - which may rely on arguments we just processed - before 1993 // doing the final argument processing. Any argument processing that 1994 // needs to know about processor and memory resources must occur after 1995 // this point. 1996 1997 os::init_container_support(); 1998 1999 SystemMemoryBarrier::initialize(); 2000 2001 // Do final processing now that all arguments have been parsed 2002 result = finalize_vm_init_args(); 2003 if (result != JNI_OK) { 2004 return result; 2005 } 2006 2007 return JNI_OK; 2008 } 2009 2010 #if !INCLUDE_JVMTI 2011 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2012 // represents a valid JDWP agent. is_path==true denotes that we 2013 // are dealing with -agentpath (case where name is a path), otherwise with 2014 // -agentlib 2015 static bool valid_jdwp_agent(char *name, bool is_path) { 2016 char *_name; 2017 const char *_jdwp = "jdwp"; 2018 size_t _len_jdwp, _len_prefix; 2019 2020 if (is_path) { 2021 if ((_name = strrchr(name, (int) *os::file_separator())) == nullptr) { 2022 return false; 2023 } 2024 2025 _name++; // skip past last path separator 2026 _len_prefix = strlen(JNI_LIB_PREFIX); 2027 2028 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2029 return false; 2030 } 2031 2032 _name += _len_prefix; 2033 _len_jdwp = strlen(_jdwp); 2034 2035 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2036 _name += _len_jdwp; 2037 } 2038 else { 2039 return false; 2040 } 2041 2042 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2043 return false; 2044 } 2045 2046 return true; 2047 } 2048 2049 if (strcmp(name, _jdwp) == 0) { 2050 return true; 2051 } 2052 2053 return false; 2054 } 2055 #endif 2056 2057 int Arguments::process_patch_mod_option(const char* patch_mod_tail) { 2058 // --patch-module=<module>=<file>(<pathsep><file>)* 2059 assert(patch_mod_tail != nullptr, "Unexpected null patch-module value"); 2060 // Find the equal sign between the module name and the path specification 2061 const char* module_equal = strchr(patch_mod_tail, '='); 2062 if (module_equal == nullptr) { 2063 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2064 return JNI_ERR; 2065 } else { 2066 // Pick out the module name 2067 size_t module_len = module_equal - patch_mod_tail; 2068 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2069 if (module_name != nullptr) { 2070 memcpy(module_name, patch_mod_tail, module_len); 2071 *(module_name + module_len) = '\0'; 2072 // The path piece begins one past the module_equal sign 2073 add_patch_mod_prefix(module_name, module_equal + 1, false /* no append */, false /* no cds */); 2074 FREE_C_HEAP_ARRAY(char, module_name); 2075 } else { 2076 return JNI_ENOMEM; 2077 } 2078 } 2079 return JNI_OK; 2080 } 2081 2082 // VALUECLASS_STR must match string used in the build 2083 #define VALUECLASS_STR "valueclasses" 2084 #define VALUECLASS_JAR "-" VALUECLASS_STR ".jar" 2085 2086 // Finalize --patch-module args and --enable-preview related to value class module patches. 2087 // Create all numbered properties passing module patches. 2088 int Arguments::finalize_patch_module() { 2089 // If --enable-preview and EnableValhalla is true, each module may have value classes that 2090 // are to be patched into the module. 2091 // For each <module>-valueclasses.jar in <JAVA_HOME>/lib/valueclasses/ 2092 // appends the equivalent of --patch-module <module>=<JAVA_HOME>/lib/valueclasses/<module>-valueclasses.jar 2093 if (enable_preview() && EnableValhalla) { 2094 char * valueclasses_dir = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2095 const char * fileSep = os::file_separator(); 2096 2097 jio_snprintf(valueclasses_dir, JVM_MAXPATHLEN, "%s%slib%s" VALUECLASS_STR "%s", 2098 Arguments::get_java_home(), fileSep, fileSep, fileSep); 2099 DIR* dir = os::opendir(valueclasses_dir); 2100 if (dir != nullptr) { 2101 char * module_name = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2102 char * path = AllocateHeap(JVM_MAXPATHLEN, mtArguments); 2103 2104 for (dirent * entry = os::readdir(dir); entry != nullptr; entry = os::readdir(dir)) { 2105 // Test if file ends-with "-valueclasses.jar" 2106 int len = (int)strlen(entry->d_name) - (sizeof(VALUECLASS_JAR) - 1); 2107 if (len <= 0 || strcmp(&entry->d_name[len], VALUECLASS_JAR) != 0) { 2108 continue; // too short or not the expected suffix 2109 } 2110 2111 strcpy(module_name, entry->d_name); 2112 module_name[len] = '\0'; // truncate to just module-name 2113 2114 jio_snprintf(path, JVM_MAXPATHLEN, "%s%s", valueclasses_dir, &entry->d_name); 2115 add_patch_mod_prefix(module_name, path, true /* append */, true /* cds OK*/); 2116 log_info(class)("--enable-preview appending value classes for module %s: %s", module_name, entry->d_name); 2117 } 2118 FreeHeap(module_name); 2119 FreeHeap(path); 2120 os::closedir(dir); 2121 } 2122 FreeHeap(valueclasses_dir); 2123 } 2124 2125 // Create numbered properties for each module that has been patched either 2126 // by --patch-module or --enable-preview 2127 // Format is "jdk.module.patch.<n>=<module_name>=<path>" 2128 if (_patch_mod_prefix != nullptr) { 2129 char * prop_value = AllocateHeap(JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, mtArguments); 2130 unsigned int patch_mod_count = 0; 2131 2132 for (GrowableArrayIterator<ModulePatchPath *> it = _patch_mod_prefix->begin(); 2133 it != _patch_mod_prefix->end(); ++it) { 2134 jio_snprintf(prop_value, JVM_MAXPATHLEN + JVM_MAXPATHLEN + 1, "%s=%s", 2135 (*it)->module_name(), (*it)->path_string()); 2136 if (!create_numbered_module_property("jdk.module.patch", prop_value, patch_mod_count++)) { 2137 FreeHeap(prop_value); 2138 return JNI_ENOMEM; 2139 } 2140 } 2141 FreeHeap(prop_value); 2142 } 2143 return JNI_OK; 2144 } 2145 2146 // Parse -Xss memory string parameter and convert to ThreadStackSize in K. 2147 jint Arguments::parse_xss(const JavaVMOption* option, const char* tail, intx* out_ThreadStackSize) { 2148 // The min and max sizes match the values in globals.hpp, but scaled 2149 // with K. The values have been chosen so that alignment with page 2150 // size doesn't change the max value, which makes the conversions 2151 // back and forth between Xss value and ThreadStackSize value easier. 2152 // The values have also been chosen to fit inside a 32-bit signed type. 2153 const julong min_ThreadStackSize = 0; 2154 const julong max_ThreadStackSize = 1 * M; 2155 2156 // Make sure the above values match the range set in globals.hpp 2157 const JVMTypedFlagLimit<intx>* limit = JVMFlagLimit::get_range_at(FLAG_MEMBER_ENUM(ThreadStackSize))->cast<intx>(); 2158 assert(min_ThreadStackSize == static_cast<julong>(limit->min()), "must be"); 2159 assert(max_ThreadStackSize == static_cast<julong>(limit->max()), "must be"); 2160 2161 const julong min_size = min_ThreadStackSize * K; 2162 const julong max_size = max_ThreadStackSize * K; 2163 2164 assert(is_aligned(max_size, os::vm_page_size()), "Implementation assumption"); 2165 2166 julong size = 0; 2167 ArgsRange errcode = parse_memory_size(tail, &size, min_size, max_size); 2168 if (errcode != arg_in_range) { 2169 bool silent = (option == nullptr); // Allow testing to silence error messages 2170 if (!silent) { 2171 jio_fprintf(defaultStream::error_stream(), 2172 "Invalid thread stack size: %s\n", option->optionString); 2173 describe_range_error(errcode); 2174 } 2175 return JNI_EINVAL; 2176 } 2177 2178 // Internally track ThreadStackSize in units of 1024 bytes. 2179 const julong size_aligned = align_up(size, K); 2180 assert(size <= size_aligned, 2181 "Overflow: " JULONG_FORMAT " " JULONG_FORMAT, 2182 size, size_aligned); 2183 2184 const julong size_in_K = size_aligned / K; 2185 assert(size_in_K < (julong)max_intx, 2186 "size_in_K doesn't fit in the type of ThreadStackSize: " JULONG_FORMAT, 2187 size_in_K); 2188 2189 // Check that code expanding ThreadStackSize to a page aligned number of bytes won't overflow. 2190 const julong max_expanded = align_up(size_in_K * K, os::vm_page_size()); 2191 assert(max_expanded < max_uintx && max_expanded >= size_in_K, 2192 "Expansion overflowed: " JULONG_FORMAT " " JULONG_FORMAT, 2193 max_expanded, size_in_K); 2194 2195 *out_ThreadStackSize = (intx)size_in_K; 2196 2197 return JNI_OK; 2198 } 2199 2200 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, JVMFlagOrigin origin) { 2201 // For match_option to return remaining or value part of option string 2202 const char* tail; 2203 2204 // iterate over arguments 2205 for (int index = 0; index < args->nOptions; index++) { 2206 bool is_absolute_path = false; // for -agentpath vs -agentlib 2207 2208 const JavaVMOption* option = args->options + index; 2209 2210 if (!match_option(option, "-Djava.class.path", &tail) && 2211 !match_option(option, "-Dsun.java.command", &tail) && 2212 !match_option(option, "-Dsun.java.launcher", &tail)) { 2213 2214 // add all jvm options to the jvm_args string. This string 2215 // is used later to set the java.vm.args PerfData string constant. 2216 // the -Djava.class.path and the -Dsun.java.command options are 2217 // omitted from jvm_args string as each have their own PerfData 2218 // string constant object. 2219 build_jvm_args(option->optionString); 2220 } 2221 2222 // -verbose:[class/module/gc/jni] 2223 if (match_option(option, "-verbose", &tail)) { 2224 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2225 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2226 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2227 } else if (!strcmp(tail, ":module")) { 2228 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, load)); 2229 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(module, unload)); 2230 } else if (!strcmp(tail, ":gc")) { 2231 if (_legacyGCLogging.lastFlag == 0) { 2232 _legacyGCLogging.lastFlag = 1; 2233 } 2234 } else if (!strcmp(tail, ":jni")) { 2235 LogConfiguration::configure_stdout(LogLevel::Debug, true, LOG_TAGS(jni, resolve)); 2236 } 2237 // -da / -ea / -disableassertions / -enableassertions 2238 // These accept an optional class/package name separated by a colon, e.g., 2239 // -da:java.lang.Thread. 2240 } else if (match_option(option, user_assertion_options, &tail, true)) { 2241 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2242 if (*tail == '\0') { 2243 JavaAssertions::setUserClassDefault(enable); 2244 } else { 2245 assert(*tail == ':', "bogus match by match_option()"); 2246 JavaAssertions::addOption(tail + 1, enable); 2247 } 2248 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2249 } else if (match_option(option, system_assertion_options, &tail, false)) { 2250 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2251 JavaAssertions::setSystemClassDefault(enable); 2252 // -bootclasspath: 2253 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2254 jio_fprintf(defaultStream::output_stream(), 2255 "-Xbootclasspath is no longer a supported option.\n"); 2256 return JNI_EINVAL; 2257 // -bootclasspath/a: 2258 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2259 Arguments::append_sysclasspath(tail); 2260 // -bootclasspath/p: 2261 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2262 jio_fprintf(defaultStream::output_stream(), 2263 "-Xbootclasspath/p is no longer a supported option.\n"); 2264 return JNI_EINVAL; 2265 // -Xrun 2266 } else if (match_option(option, "-Xrun", &tail)) { 2267 if (tail != nullptr) { 2268 const char* pos = strchr(tail, ':'); 2269 size_t len = (pos == nullptr) ? strlen(tail) : pos - tail; 2270 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2271 jio_snprintf(name, len + 1, "%s", tail); 2272 2273 char *options = nullptr; 2274 if(pos != nullptr) { 2275 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2276 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2277 } 2278 #if !INCLUDE_JVMTI 2279 if (strcmp(name, "jdwp") == 0) { 2280 jio_fprintf(defaultStream::error_stream(), 2281 "Debugging agents are not supported in this VM\n"); 2282 return JNI_ERR; 2283 } 2284 #endif // !INCLUDE_JVMTI 2285 JvmtiAgentList::add_xrun(name, options, false); 2286 FREE_C_HEAP_ARRAY(char, name); 2287 FREE_C_HEAP_ARRAY(char, options); 2288 } 2289 } else if (match_option(option, "--add-reads=", &tail)) { 2290 if (!create_numbered_module_property("jdk.module.addreads", tail, addreads_count++)) { 2291 return JNI_ENOMEM; 2292 } 2293 } else if (match_option(option, "--add-exports=", &tail)) { 2294 if (!create_numbered_module_property("jdk.module.addexports", tail, addexports_count++)) { 2295 return JNI_ENOMEM; 2296 } 2297 } else if (match_option(option, "--add-opens=", &tail)) { 2298 if (!create_numbered_module_property("jdk.module.addopens", tail, addopens_count++)) { 2299 return JNI_ENOMEM; 2300 } 2301 } else if (match_option(option, "--add-modules=", &tail)) { 2302 if (!create_numbered_module_property("jdk.module.addmods", tail, _addmods_count++)) { 2303 return JNI_ENOMEM; 2304 } 2305 } else if (match_option(option, "--enable-native-access=", &tail)) { 2306 if (!create_numbered_module_property("jdk.module.enable.native.access", tail, enable_native_access_count++)) { 2307 return JNI_ENOMEM; 2308 } 2309 } else if (match_option(option, "--illegal-native-access=", &tail)) { 2310 if (!create_module_property("jdk.module.illegal.native.access", tail, InternalProperty)) { 2311 return JNI_ENOMEM; 2312 } 2313 } else if (match_option(option, "--limit-modules=", &tail)) { 2314 if (!create_module_property("jdk.module.limitmods", tail, InternalProperty)) { 2315 return JNI_ENOMEM; 2316 } 2317 } else if (match_option(option, "--module-path=", &tail)) { 2318 if (!create_module_property("jdk.module.path", tail, ExternalProperty)) { 2319 return JNI_ENOMEM; 2320 } 2321 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2322 if (!create_module_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2323 return JNI_ENOMEM; 2324 } 2325 } else if (match_option(option, "--patch-module=", &tail)) { 2326 // --patch-module=<module>=<file>(<pathsep><file>)* 2327 int res = process_patch_mod_option(tail); 2328 if (res != JNI_OK) { 2329 return res; 2330 } 2331 } else if (match_option(option, "--sun-misc-unsafe-memory-access=", &tail)) { 2332 if (strcmp(tail, "allow") == 0 || strcmp(tail, "warn") == 0 || strcmp(tail, "debug") == 0 || strcmp(tail, "deny") == 0) { 2333 PropertyList_unique_add(&_system_properties, "sun.misc.unsafe.memory.access", tail, 2334 AddProperty, WriteableProperty, InternalProperty); 2335 } else { 2336 jio_fprintf(defaultStream::error_stream(), 2337 "Value specified to --sun-misc-unsafe-memory-access not recognized: '%s'\n", tail); 2338 return JNI_ERR; 2339 } 2340 } else if (match_option(option, "--illegal-access=", &tail)) { 2341 char version[256]; 2342 JDK_Version::jdk(17).to_string(version, sizeof(version)); 2343 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2344 // -agentlib and -agentpath 2345 } else if (match_option(option, "-agentlib:", &tail) || 2346 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2347 if(tail != nullptr) { 2348 const char* pos = strchr(tail, '='); 2349 char* name; 2350 if (pos == nullptr) { 2351 name = os::strdup_check_oom(tail, mtArguments); 2352 } else { 2353 size_t len = pos - tail; 2354 name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2355 memcpy(name, tail, len); 2356 name[len] = '\0'; 2357 } 2358 2359 char *options = nullptr; 2360 if(pos != nullptr) { 2361 options = os::strdup_check_oom(pos + 1, mtArguments); 2362 } 2363 #if !INCLUDE_JVMTI 2364 if (valid_jdwp_agent(name, is_absolute_path)) { 2365 jio_fprintf(defaultStream::error_stream(), 2366 "Debugging agents are not supported in this VM\n"); 2367 return JNI_ERR; 2368 } 2369 #endif // !INCLUDE_JVMTI 2370 JvmtiAgentList::add(name, options, is_absolute_path); 2371 os::free(name); 2372 os::free(options); 2373 } 2374 // -javaagent 2375 } else if (match_option(option, "-javaagent:", &tail)) { 2376 #if !INCLUDE_JVMTI 2377 jio_fprintf(defaultStream::error_stream(), 2378 "Instrumentation agents are not supported in this VM\n"); 2379 return JNI_ERR; 2380 #else 2381 if (tail != nullptr) { 2382 size_t length = strlen(tail) + 1; 2383 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2384 jio_snprintf(options, length, "%s", tail); 2385 JvmtiAgentList::add("instrument", options, false); 2386 FREE_C_HEAP_ARRAY(char, options); 2387 2388 // java agents need module java.instrument 2389 if (!create_numbered_module_property("jdk.module.addmods", "java.instrument", _addmods_count++)) { 2390 return JNI_ENOMEM; 2391 } 2392 } 2393 #endif // !INCLUDE_JVMTI 2394 // --enable_preview 2395 } else if (match_option(option, "--enable-preview")) { 2396 set_enable_preview(); 2397 // --enable-preview enables Valhalla, EnableValhalla VM option will eventually be removed before integration 2398 if (FLAG_SET_CMDLINE(EnableValhalla, true) != JVMFlag::SUCCESS) { 2399 return JNI_EINVAL; 2400 } 2401 // -Xnoclassgc 2402 } else if (match_option(option, "-Xnoclassgc")) { 2403 if (FLAG_SET_CMDLINE(ClassUnloading, false) != JVMFlag::SUCCESS) { 2404 return JNI_EINVAL; 2405 } 2406 // -Xbatch 2407 } else if (match_option(option, "-Xbatch")) { 2408 if (FLAG_SET_CMDLINE(BackgroundCompilation, false) != JVMFlag::SUCCESS) { 2409 return JNI_EINVAL; 2410 } 2411 // -Xmn for compatibility with other JVM vendors 2412 } else if (match_option(option, "-Xmn", &tail)) { 2413 julong long_initial_young_size = 0; 2414 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2415 if (errcode != arg_in_range) { 2416 jio_fprintf(defaultStream::error_stream(), 2417 "Invalid initial young generation size: %s\n", option->optionString); 2418 describe_range_error(errcode); 2419 return JNI_EINVAL; 2420 } 2421 if (FLAG_SET_CMDLINE(MaxNewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2422 return JNI_EINVAL; 2423 } 2424 if (FLAG_SET_CMDLINE(NewSize, (size_t)long_initial_young_size) != JVMFlag::SUCCESS) { 2425 return JNI_EINVAL; 2426 } 2427 // -Xms 2428 } else if (match_option(option, "-Xms", &tail)) { 2429 julong size = 0; 2430 // an initial heap size of 0 means automatically determine 2431 ArgsRange errcode = parse_memory_size(tail, &size, 0); 2432 if (errcode != arg_in_range) { 2433 jio_fprintf(defaultStream::error_stream(), 2434 "Invalid initial heap size: %s\n", option->optionString); 2435 describe_range_error(errcode); 2436 return JNI_EINVAL; 2437 } 2438 if (FLAG_SET_CMDLINE(MinHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2439 return JNI_EINVAL; 2440 } 2441 if (FLAG_SET_CMDLINE(InitialHeapSize, (size_t)size) != JVMFlag::SUCCESS) { 2442 return JNI_EINVAL; 2443 } 2444 // -Xmx 2445 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2446 julong long_max_heap_size = 0; 2447 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2448 if (errcode != arg_in_range) { 2449 jio_fprintf(defaultStream::error_stream(), 2450 "Invalid maximum heap size: %s\n", option->optionString); 2451 describe_range_error(errcode); 2452 return JNI_EINVAL; 2453 } 2454 if (FLAG_SET_CMDLINE(MaxHeapSize, (size_t)long_max_heap_size) != JVMFlag::SUCCESS) { 2455 return JNI_EINVAL; 2456 } 2457 // Xmaxf 2458 } else if (match_option(option, "-Xmaxf", &tail)) { 2459 char* err; 2460 int maxf = (int)(strtod(tail, &err) * 100); 2461 if (*err != '\0' || *tail == '\0') { 2462 jio_fprintf(defaultStream::error_stream(), 2463 "Bad max heap free percentage size: %s\n", 2464 option->optionString); 2465 return JNI_EINVAL; 2466 } else { 2467 if (FLAG_SET_CMDLINE(MaxHeapFreeRatio, maxf) != JVMFlag::SUCCESS) { 2468 return JNI_EINVAL; 2469 } 2470 } 2471 // Xminf 2472 } else if (match_option(option, "-Xminf", &tail)) { 2473 char* err; 2474 int minf = (int)(strtod(tail, &err) * 100); 2475 if (*err != '\0' || *tail == '\0') { 2476 jio_fprintf(defaultStream::error_stream(), 2477 "Bad min heap free percentage size: %s\n", 2478 option->optionString); 2479 return JNI_EINVAL; 2480 } else { 2481 if (FLAG_SET_CMDLINE(MinHeapFreeRatio, minf) != JVMFlag::SUCCESS) { 2482 return JNI_EINVAL; 2483 } 2484 } 2485 // -Xss 2486 } else if (match_option(option, "-Xss", &tail)) { 2487 intx value = 0; 2488 jint err = parse_xss(option, tail, &value); 2489 if (err != JNI_OK) { 2490 return err; 2491 } 2492 if (FLAG_SET_CMDLINE(ThreadStackSize, value) != JVMFlag::SUCCESS) { 2493 return JNI_EINVAL; 2494 } 2495 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 2496 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 2497 julong long_ReservedCodeCacheSize = 0; 2498 2499 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 2500 if (errcode != arg_in_range) { 2501 jio_fprintf(defaultStream::error_stream(), 2502 "Invalid maximum code cache size: %s.\n", option->optionString); 2503 return JNI_EINVAL; 2504 } 2505 if (FLAG_SET_CMDLINE(ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != JVMFlag::SUCCESS) { 2506 return JNI_EINVAL; 2507 } 2508 // -green 2509 } else if (match_option(option, "-green")) { 2510 jio_fprintf(defaultStream::error_stream(), 2511 "Green threads support not available\n"); 2512 return JNI_EINVAL; 2513 // -native 2514 } else if (match_option(option, "-native")) { 2515 // HotSpot always uses native threads, ignore silently for compatibility 2516 // -Xrs 2517 } else if (match_option(option, "-Xrs")) { 2518 // Classic/EVM option, new functionality 2519 if (FLAG_SET_CMDLINE(ReduceSignalUsage, true) != JVMFlag::SUCCESS) { 2520 return JNI_EINVAL; 2521 } 2522 // -Xprof 2523 } else if (match_option(option, "-Xprof")) { 2524 char version[256]; 2525 // Obsolete in JDK 10 2526 JDK_Version::jdk(10).to_string(version, sizeof(version)); 2527 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 2528 // -Xinternalversion 2529 } else if (match_option(option, "-Xinternalversion")) { 2530 jio_fprintf(defaultStream::output_stream(), "%s\n", 2531 VM_Version::internal_vm_info_string()); 2532 vm_exit(0); 2533 #ifndef PRODUCT 2534 // -Xprintflags 2535 } else if (match_option(option, "-Xprintflags")) { 2536 JVMFlag::printFlags(tty, false); 2537 vm_exit(0); 2538 #endif 2539 // -D 2540 } else if (match_option(option, "-D", &tail)) { 2541 const char* value; 2542 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 2543 *value!= '\0' && strcmp(value, "\"\"") != 0) { 2544 // abort if -Djava.endorsed.dirs is set 2545 jio_fprintf(defaultStream::output_stream(), 2546 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 2547 "in modular form will be supported via the concept of upgradeable modules.\n", value); 2548 return JNI_EINVAL; 2549 } 2550 if (match_option(option, "-Djava.ext.dirs=", &value) && 2551 *value != '\0' && strcmp(value, "\"\"") != 0) { 2552 // abort if -Djava.ext.dirs is set 2553 jio_fprintf(defaultStream::output_stream(), 2554 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 2555 return JNI_EINVAL; 2556 } 2557 // Check for module related properties. They must be set using the modules 2558 // options. For example: use "--add-modules=java.sql", not 2559 // "-Djdk.module.addmods=java.sql" 2560 if (is_internal_module_property(option->optionString + 2)) { 2561 needs_module_property_warning = true; 2562 continue; 2563 } 2564 if (!add_property(tail)) { 2565 return JNI_ENOMEM; 2566 } 2567 // Out of the box management support 2568 if (match_option(option, "-Dcom.sun.management", &tail)) { 2569 #if INCLUDE_MANAGEMENT 2570 if (FLAG_SET_CMDLINE(ManagementServer, true) != JVMFlag::SUCCESS) { 2571 return JNI_EINVAL; 2572 } 2573 // management agent in module jdk.management.agent 2574 if (!create_numbered_module_property("jdk.module.addmods", "jdk.management.agent", _addmods_count++)) { 2575 return JNI_ENOMEM; 2576 } 2577 #else 2578 jio_fprintf(defaultStream::output_stream(), 2579 "-Dcom.sun.management is not supported in this VM.\n"); 2580 return JNI_ERR; 2581 #endif 2582 } 2583 // -Xint 2584 } else if (match_option(option, "-Xint")) { 2585 set_mode_flags(_int); 2586 mode_flag_cmd_line = true; 2587 // -Xmixed 2588 } else if (match_option(option, "-Xmixed")) { 2589 set_mode_flags(_mixed); 2590 mode_flag_cmd_line = true; 2591 // -Xcomp 2592 } else if (match_option(option, "-Xcomp")) { 2593 // for testing the compiler; turn off all flags that inhibit compilation 2594 set_mode_flags(_comp); 2595 mode_flag_cmd_line = true; 2596 // -Xshare:dump 2597 } else if (match_option(option, "-Xshare:dump")) { 2598 CDSConfig::enable_dumping_static_archive(); 2599 CDSConfig::set_old_cds_flags_used(); 2600 // -Xshare:on 2601 } else if (match_option(option, "-Xshare:on")) { 2602 UseSharedSpaces = true; 2603 RequireSharedSpaces = true; 2604 CDSConfig::set_old_cds_flags_used(); 2605 // -Xshare:auto || -XX:ArchiveClassesAtExit=<archive file> 2606 } else if (match_option(option, "-Xshare:auto")) { 2607 UseSharedSpaces = true; 2608 RequireSharedSpaces = false; 2609 xshare_auto_cmd_line = true; 2610 CDSConfig::set_old_cds_flags_used(); 2611 // -Xshare:off 2612 } else if (match_option(option, "-Xshare:off")) { 2613 UseSharedSpaces = false; 2614 RequireSharedSpaces = false; 2615 CDSConfig::set_old_cds_flags_used(); 2616 // -Xverify 2617 } else if (match_option(option, "-Xverify", &tail)) { 2618 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 2619 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, true) != JVMFlag::SUCCESS) { 2620 return JNI_EINVAL; 2621 } 2622 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2623 return JNI_EINVAL; 2624 } 2625 } else if (strcmp(tail, ":remote") == 0) { 2626 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2627 return JNI_EINVAL; 2628 } 2629 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, true) != JVMFlag::SUCCESS) { 2630 return JNI_EINVAL; 2631 } 2632 } else if (strcmp(tail, ":none") == 0) { 2633 if (FLAG_SET_CMDLINE(BytecodeVerificationLocal, false) != JVMFlag::SUCCESS) { 2634 return JNI_EINVAL; 2635 } 2636 if (FLAG_SET_CMDLINE(BytecodeVerificationRemote, false) != JVMFlag::SUCCESS) { 2637 return JNI_EINVAL; 2638 } 2639 warning("Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release."); 2640 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 2641 return JNI_EINVAL; 2642 } 2643 // -Xdebug 2644 } else if (match_option(option, "-Xdebug")) { 2645 warning("Option -Xdebug was deprecated in JDK 22 and will likely be removed in a future release."); 2646 } else if (match_option(option, "-Xloggc:", &tail)) { 2647 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 2648 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 2649 _legacyGCLogging.lastFlag = 2; 2650 _legacyGCLogging.file = os::strdup_check_oom(tail); 2651 } else if (match_option(option, "-Xlog", &tail)) { 2652 bool ret = false; 2653 if (strcmp(tail, ":help") == 0) { 2654 fileStream stream(defaultStream::output_stream()); 2655 LogConfiguration::print_command_line_help(&stream); 2656 vm_exit(0); 2657 } else if (strcmp(tail, ":disable") == 0) { 2658 LogConfiguration::disable_logging(); 2659 ret = true; 2660 } else if (strcmp(tail, ":async") == 0) { 2661 LogConfiguration::set_async_mode(true); 2662 ret = true; 2663 } else if (*tail == '\0') { 2664 ret = LogConfiguration::parse_command_line_arguments(); 2665 assert(ret, "-Xlog without arguments should never fail to parse"); 2666 } else if (*tail == ':') { 2667 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 2668 } 2669 if (ret == false) { 2670 jio_fprintf(defaultStream::error_stream(), 2671 "Invalid -Xlog option '-Xlog%s', see error log for details.\n", 2672 tail); 2673 return JNI_EINVAL; 2674 } 2675 // JNI hooks 2676 } else if (match_option(option, "-Xcheck", &tail)) { 2677 if (!strcmp(tail, ":jni")) { 2678 #if !INCLUDE_JNI_CHECK 2679 warning("JNI CHECKING is not supported in this VM"); 2680 #else 2681 CheckJNICalls = true; 2682 #endif // INCLUDE_JNI_CHECK 2683 } else if (is_bad_option(option, args->ignoreUnrecognized, 2684 "check")) { 2685 return JNI_EINVAL; 2686 } 2687 } else if (match_option(option, "vfprintf")) { 2688 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 2689 } else if (match_option(option, "exit")) { 2690 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 2691 } else if (match_option(option, "abort")) { 2692 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 2693 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 2694 // and the last option wins. 2695 } else if (match_option(option, "-XX:+NeverTenure")) { 2696 if (FLAG_SET_CMDLINE(NeverTenure, true) != JVMFlag::SUCCESS) { 2697 return JNI_EINVAL; 2698 } 2699 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2700 return JNI_EINVAL; 2701 } 2702 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, markWord::max_age + 1) != JVMFlag::SUCCESS) { 2703 return JNI_EINVAL; 2704 } 2705 } else if (match_option(option, "-XX:+AlwaysTenure")) { 2706 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2707 return JNI_EINVAL; 2708 } 2709 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2710 return JNI_EINVAL; 2711 } 2712 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, 0) != JVMFlag::SUCCESS) { 2713 return JNI_EINVAL; 2714 } 2715 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 2716 uint max_tenuring_thresh = 0; 2717 if (!parse_uint(tail, &max_tenuring_thresh, 0)) { 2718 jio_fprintf(defaultStream::error_stream(), 2719 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 2720 return JNI_EINVAL; 2721 } 2722 2723 if (FLAG_SET_CMDLINE(MaxTenuringThreshold, max_tenuring_thresh) != JVMFlag::SUCCESS) { 2724 return JNI_EINVAL; 2725 } 2726 2727 if (MaxTenuringThreshold == 0) { 2728 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2729 return JNI_EINVAL; 2730 } 2731 if (FLAG_SET_CMDLINE(AlwaysTenure, true) != JVMFlag::SUCCESS) { 2732 return JNI_EINVAL; 2733 } 2734 } else { 2735 if (FLAG_SET_CMDLINE(NeverTenure, false) != JVMFlag::SUCCESS) { 2736 return JNI_EINVAL; 2737 } 2738 if (FLAG_SET_CMDLINE(AlwaysTenure, false) != JVMFlag::SUCCESS) { 2739 return JNI_EINVAL; 2740 } 2741 } 2742 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 2743 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, false) != JVMFlag::SUCCESS) { 2744 return JNI_EINVAL; 2745 } 2746 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, true) != JVMFlag::SUCCESS) { 2747 return JNI_EINVAL; 2748 } 2749 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 2750 if (FLAG_SET_CMDLINE(DisplayVMOutputToStderr, false) != JVMFlag::SUCCESS) { 2751 return JNI_EINVAL; 2752 } 2753 if (FLAG_SET_CMDLINE(DisplayVMOutputToStdout, true) != JVMFlag::SUCCESS) { 2754 return JNI_EINVAL; 2755 } 2756 } else if (match_option(option, "-XX:+ErrorFileToStderr")) { 2757 if (FLAG_SET_CMDLINE(ErrorFileToStdout, false) != JVMFlag::SUCCESS) { 2758 return JNI_EINVAL; 2759 } 2760 if (FLAG_SET_CMDLINE(ErrorFileToStderr, true) != JVMFlag::SUCCESS) { 2761 return JNI_EINVAL; 2762 } 2763 } else if (match_option(option, "-XX:+ErrorFileToStdout")) { 2764 if (FLAG_SET_CMDLINE(ErrorFileToStderr, false) != JVMFlag::SUCCESS) { 2765 return JNI_EINVAL; 2766 } 2767 if (FLAG_SET_CMDLINE(ErrorFileToStdout, true) != JVMFlag::SUCCESS) { 2768 return JNI_EINVAL; 2769 } 2770 } else if (match_option(option, "--finalization=", &tail)) { 2771 if (strcmp(tail, "enabled") == 0) { 2772 InstanceKlass::set_finalization_enabled(true); 2773 } else if (strcmp(tail, "disabled") == 0) { 2774 InstanceKlass::set_finalization_enabled(false); 2775 } else { 2776 jio_fprintf(defaultStream::error_stream(), 2777 "Invalid finalization value '%s', must be 'disabled' or 'enabled'.\n", 2778 tail); 2779 return JNI_EINVAL; 2780 } 2781 #if !defined(DTRACE_ENABLED) 2782 } else if (match_option(option, "-XX:+DTraceMethodProbes")) { 2783 jio_fprintf(defaultStream::error_stream(), 2784 "DTraceMethodProbes flag is not applicable for this configuration\n"); 2785 return JNI_EINVAL; 2786 } else if (match_option(option, "-XX:+DTraceAllocProbes")) { 2787 jio_fprintf(defaultStream::error_stream(), 2788 "DTraceAllocProbes flag is not applicable for this configuration\n"); 2789 return JNI_EINVAL; 2790 } else if (match_option(option, "-XX:+DTraceMonitorProbes")) { 2791 jio_fprintf(defaultStream::error_stream(), 2792 "DTraceMonitorProbes flag is not applicable for this configuration\n"); 2793 return JNI_EINVAL; 2794 #endif // !defined(DTRACE_ENABLED) 2795 #ifdef ASSERT 2796 } else if (match_option(option, "-XX:+FullGCALot")) { 2797 if (FLAG_SET_CMDLINE(FullGCALot, true) != JVMFlag::SUCCESS) { 2798 return JNI_EINVAL; 2799 } 2800 #endif 2801 #if !INCLUDE_MANAGEMENT 2802 } else if (match_option(option, "-XX:+ManagementServer")) { 2803 jio_fprintf(defaultStream::error_stream(), 2804 "ManagementServer is not supported in this VM.\n"); 2805 return JNI_ERR; 2806 #endif // INCLUDE_MANAGEMENT 2807 #if INCLUDE_JVMCI 2808 } else if (match_option(option, "-XX:-EnableJVMCIProduct") || match_option(option, "-XX:-UseGraalJIT")) { 2809 if (EnableJVMCIProduct) { 2810 jio_fprintf(defaultStream::error_stream(), 2811 "-XX:-EnableJVMCIProduct or -XX:-UseGraalJIT cannot come after -XX:+EnableJVMCIProduct or -XX:+UseGraalJIT\n"); 2812 return JNI_EINVAL; 2813 } 2814 } else if (match_option(option, "-XX:+EnableJVMCIProduct") || match_option(option, "-XX:+UseGraalJIT")) { 2815 bool use_graal_jit = match_option(option, "-XX:+UseGraalJIT"); 2816 if (use_graal_jit) { 2817 const char* jvmci_compiler = get_property("jvmci.Compiler"); 2818 if (jvmci_compiler != nullptr) { 2819 if (strncmp(jvmci_compiler, "graal", strlen("graal")) != 0) { 2820 jio_fprintf(defaultStream::error_stream(), 2821 "Value of jvmci.Compiler incompatible with +UseGraalJIT: %s\n", jvmci_compiler); 2822 return JNI_ERR; 2823 } 2824 } else if (!add_property("jvmci.Compiler=graal")) { 2825 return JNI_ENOMEM; 2826 } 2827 } 2828 2829 // Just continue, since "-XX:+EnableJVMCIProduct" or "-XX:+UseGraalJIT" has been specified before 2830 if (EnableJVMCIProduct) { 2831 continue; 2832 } 2833 JVMFlag *jvmciFlag = JVMFlag::find_flag("EnableJVMCIProduct"); 2834 // Allow this flag if it has been unlocked. 2835 if (jvmciFlag != nullptr && jvmciFlag->is_unlocked()) { 2836 if (!JVMCIGlobals::enable_jvmci_product_mode(origin, use_graal_jit)) { 2837 jio_fprintf(defaultStream::error_stream(), 2838 "Unable to enable JVMCI in product mode\n"); 2839 return JNI_ERR; 2840 } 2841 } 2842 // The flag was locked so process normally to report that error 2843 else if (!process_argument(use_graal_jit ? "UseGraalJIT" : "EnableJVMCIProduct", args->ignoreUnrecognized, origin)) { 2844 return JNI_EINVAL; 2845 } 2846 #endif // INCLUDE_JVMCI 2847 #if INCLUDE_JFR 2848 } else if (match_jfr_option(&option)) { 2849 return JNI_EINVAL; 2850 #endif 2851 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 2852 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 2853 // already been handled 2854 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 2855 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 2856 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 2857 return JNI_EINVAL; 2858 } 2859 } 2860 // Unknown option 2861 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 2862 return JNI_ERR; 2863 } 2864 } 2865 2866 // PrintSharedArchiveAndExit will turn on 2867 // -Xshare:on 2868 // -Xlog:class+path=info 2869 if (PrintSharedArchiveAndExit) { 2870 UseSharedSpaces = true; 2871 RequireSharedSpaces = true; 2872 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 2873 } 2874 2875 fix_appclasspath(); 2876 2877 return JNI_OK; 2878 } 2879 2880 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool allow_append, bool allow_cds) { 2881 if (!allow_cds) { 2882 CDSConfig::set_module_patching_disables_cds(); 2883 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2884 CDSConfig::set_java_base_module_patching_disables_cds(); 2885 } 2886 } 2887 2888 // Create GrowableArray lazily, only if --patch-module has been specified 2889 if (_patch_mod_prefix == nullptr) { 2890 _patch_mod_prefix = new (mtArguments) GrowableArray<ModulePatchPath*>(10, mtArguments); 2891 } 2892 2893 // Scan patches for matching module 2894 int i = _patch_mod_prefix->find_if([&](ModulePatchPath* patch) { 2895 return (strcmp(module_name, patch->module_name()) == 0); 2896 }); 2897 if (i == -1) { 2898 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 2899 } else { 2900 if (allow_append) { 2901 // append path to existing module entry 2902 _patch_mod_prefix->at(i)->append_path(path); 2903 } else { 2904 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 2905 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 2906 } else { 2907 vm_exit_during_initialization("Cannot specify a module more than once to --patch-module", module_name); 2908 } 2909 } 2910 } 2911 } 2912 2913 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 2914 // 2915 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 2916 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 2917 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 2918 // path is treated as the current directory. 2919 // 2920 // This causes problems with CDS, which requires that all directories specified in the classpath 2921 // must be empty. In most cases, applications do NOT want to load classes from the current 2922 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 2923 // scripts compatible with CDS. 2924 void Arguments::fix_appclasspath() { 2925 if (IgnoreEmptyClassPaths) { 2926 const char separator = *os::path_separator(); 2927 const char* src = _java_class_path->value(); 2928 2929 // skip over all the leading empty paths 2930 while (*src == separator) { 2931 src ++; 2932 } 2933 2934 char* copy = os::strdup_check_oom(src, mtArguments); 2935 2936 // trim all trailing empty paths 2937 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 2938 *tail = '\0'; 2939 } 2940 2941 char from[3] = {separator, separator, '\0'}; 2942 char to [2] = {separator, '\0'}; 2943 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 2944 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 2945 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 2946 } 2947 2948 _java_class_path->set_writeable_value(copy); 2949 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 2950 } 2951 } 2952 2953 jint Arguments::finalize_vm_init_args() { 2954 // check if the default lib/endorsed directory exists; if so, error 2955 char path[JVM_MAXPATHLEN]; 2956 const char* fileSep = os::file_separator(); 2957 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 2958 2959 DIR* dir = os::opendir(path); 2960 if (dir != nullptr) { 2961 jio_fprintf(defaultStream::output_stream(), 2962 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 2963 "in modular form will be supported via the concept of upgradeable modules.\n"); 2964 os::closedir(dir); 2965 return JNI_ERR; 2966 } 2967 2968 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 2969 dir = os::opendir(path); 2970 if (dir != nullptr) { 2971 jio_fprintf(defaultStream::output_stream(), 2972 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 2973 "Use -classpath instead.\n."); 2974 os::closedir(dir); 2975 return JNI_ERR; 2976 } 2977 2978 // This must be done after all arguments have been processed 2979 // and the container support has been initialized since AggressiveHeap 2980 // relies on the amount of total memory available. 2981 if (AggressiveHeap) { 2982 jint result = set_aggressive_heap_flags(); 2983 if (result != JNI_OK) { 2984 return result; 2985 } 2986 } 2987 2988 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 2989 // but like -Xint, leave compilation thresholds unaffected. 2990 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 2991 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 2992 set_mode_flags(_int); 2993 } 2994 2995 #ifdef ZERO 2996 // Zero always runs in interpreted mode 2997 set_mode_flags(_int); 2998 #endif 2999 3000 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3001 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3002 FLAG_SET_ERGO(InitialTenuringThreshold, MaxTenuringThreshold); 3003 } 3004 3005 #if !COMPILER2_OR_JVMCI 3006 // Don't degrade server performance for footprint 3007 if (FLAG_IS_DEFAULT(UseLargePages) && 3008 MaxHeapSize < LargePageHeapSizeThreshold) { 3009 // No need for large granularity pages w/small heaps. 3010 // Note that large pages are enabled/disabled for both the 3011 // Java heap and the code cache. 3012 FLAG_SET_DEFAULT(UseLargePages, false); 3013 } 3014 3015 UNSUPPORTED_OPTION(ProfileInterpreter); 3016 #endif 3017 3018 // Parse the CompilationMode flag 3019 if (!CompilationModeFlag::initialize()) { 3020 return JNI_ERR; 3021 } 3022 3023 // finalize --module-patch and related --enable-preview 3024 if (finalize_patch_module() != JNI_OK) { 3025 return JNI_ERR; 3026 } 3027 3028 if (!check_vm_args_consistency()) { 3029 return JNI_ERR; 3030 } 3031 3032 #ifndef CAN_SHOW_REGISTERS_ON_ASSERT 3033 UNSUPPORTED_OPTION(ShowRegistersOnAssert); 3034 #endif // CAN_SHOW_REGISTERS_ON_ASSERT 3035 3036 return JNI_OK; 3037 } 3038 3039 // Helper class for controlling the lifetime of JavaVMInitArgs 3040 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3041 // deleted on the destruction of the ScopedVMInitArgs object. 3042 class ScopedVMInitArgs : public StackObj { 3043 private: 3044 JavaVMInitArgs _args; 3045 char* _container_name; 3046 bool _is_set; 3047 char* _vm_options_file_arg; 3048 3049 public: 3050 ScopedVMInitArgs(const char *container_name) { 3051 _args.version = JNI_VERSION_1_2; 3052 _args.nOptions = 0; 3053 _args.options = nullptr; 3054 _args.ignoreUnrecognized = false; 3055 _container_name = (char *)container_name; 3056 _is_set = false; 3057 _vm_options_file_arg = nullptr; 3058 } 3059 3060 // Populates the JavaVMInitArgs object represented by this 3061 // ScopedVMInitArgs object with the arguments in options. The 3062 // allocated memory is deleted by the destructor. If this method 3063 // returns anything other than JNI_OK, then this object is in a 3064 // partially constructed state, and should be abandoned. 3065 jint set_args(const GrowableArrayView<JavaVMOption>* options) { 3066 _is_set = true; 3067 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3068 JavaVMOption, options->length(), mtArguments); 3069 if (options_arr == nullptr) { 3070 return JNI_ENOMEM; 3071 } 3072 _args.options = options_arr; 3073 3074 for (int i = 0; i < options->length(); i++) { 3075 options_arr[i] = options->at(i); 3076 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3077 if (options_arr[i].optionString == nullptr) { 3078 // Rely on the destructor to do cleanup. 3079 _args.nOptions = i; 3080 return JNI_ENOMEM; 3081 } 3082 } 3083 3084 _args.nOptions = options->length(); 3085 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3086 return JNI_OK; 3087 } 3088 3089 JavaVMInitArgs* get() { return &_args; } 3090 char* container_name() { return _container_name; } 3091 bool is_set() { return _is_set; } 3092 bool found_vm_options_file_arg() { return _vm_options_file_arg != nullptr; } 3093 char* vm_options_file_arg() { return _vm_options_file_arg; } 3094 3095 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3096 if (_vm_options_file_arg != nullptr) { 3097 os::free(_vm_options_file_arg); 3098 } 3099 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3100 } 3101 3102 ~ScopedVMInitArgs() { 3103 if (_vm_options_file_arg != nullptr) { 3104 os::free(_vm_options_file_arg); 3105 } 3106 if (_args.options == nullptr) return; 3107 for (int i = 0; i < _args.nOptions; i++) { 3108 os::free(_args.options[i].optionString); 3109 } 3110 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3111 } 3112 3113 // Insert options into this option list, to replace option at 3114 // vm_options_file_pos (-XX:VMOptionsFile) 3115 jint insert(const JavaVMInitArgs* args, 3116 const JavaVMInitArgs* args_to_insert, 3117 const int vm_options_file_pos) { 3118 assert(_args.options == nullptr, "shouldn't be set yet"); 3119 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3120 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3121 3122 int length = args->nOptions + args_to_insert->nOptions - 1; 3123 // Construct new option array 3124 GrowableArrayCHeap<JavaVMOption, mtArguments> options(length); 3125 for (int i = 0; i < args->nOptions; i++) { 3126 if (i == vm_options_file_pos) { 3127 // insert the new options starting at the same place as the 3128 // -XX:VMOptionsFile option 3129 for (int j = 0; j < args_to_insert->nOptions; j++) { 3130 options.push(args_to_insert->options[j]); 3131 } 3132 } else { 3133 options.push(args->options[i]); 3134 } 3135 } 3136 // make into options array 3137 return set_args(&options); 3138 } 3139 }; 3140 3141 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3142 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3143 } 3144 3145 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3146 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3147 } 3148 3149 jint Arguments::parse_options_environment_variable(const char* name, 3150 ScopedVMInitArgs* vm_args) { 3151 char *buffer = ::getenv(name); 3152 3153 // Don't check this environment variable if user has special privileges 3154 // (e.g. unix su command). 3155 if (buffer == nullptr || os::have_special_privileges()) { 3156 return JNI_OK; 3157 } 3158 3159 if ((buffer = os::strdup(buffer)) == nullptr) { 3160 return JNI_ENOMEM; 3161 } 3162 3163 jio_fprintf(defaultStream::error_stream(), 3164 "Picked up %s: %s\n", name, buffer); 3165 3166 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3167 3168 os::free(buffer); 3169 return retcode; 3170 } 3171 3172 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3173 // read file into buffer 3174 int fd = ::open(file_name, O_RDONLY); 3175 if (fd < 0) { 3176 jio_fprintf(defaultStream::error_stream(), 3177 "Could not open options file '%s'\n", 3178 file_name); 3179 return JNI_ERR; 3180 } 3181 3182 struct stat stbuf; 3183 int retcode = os::stat(file_name, &stbuf); 3184 if (retcode != 0) { 3185 jio_fprintf(defaultStream::error_stream(), 3186 "Could not stat options file '%s'\n", 3187 file_name); 3188 ::close(fd); 3189 return JNI_ERR; 3190 } 3191 3192 if (stbuf.st_size == 0) { 3193 // tell caller there is no option data and that is ok 3194 ::close(fd); 3195 return JNI_OK; 3196 } 3197 3198 // '+ 1' for null termination even with max bytes 3199 size_t bytes_alloc = stbuf.st_size + 1; 3200 3201 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3202 if (nullptr == buf) { 3203 jio_fprintf(defaultStream::error_stream(), 3204 "Could not allocate read buffer for options file parse\n"); 3205 ::close(fd); 3206 return JNI_ENOMEM; 3207 } 3208 3209 memset(buf, 0, bytes_alloc); 3210 3211 // Fill buffer 3212 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3213 ::close(fd); 3214 if (bytes_read < 0) { 3215 FREE_C_HEAP_ARRAY(char, buf); 3216 jio_fprintf(defaultStream::error_stream(), 3217 "Could not read options file '%s'\n", file_name); 3218 return JNI_ERR; 3219 } 3220 3221 if (bytes_read == 0) { 3222 // tell caller there is no option data and that is ok 3223 FREE_C_HEAP_ARRAY(char, buf); 3224 return JNI_OK; 3225 } 3226 3227 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3228 3229 FREE_C_HEAP_ARRAY(char, buf); 3230 return retcode; 3231 } 3232 3233 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3234 // Construct option array 3235 GrowableArrayCHeap<JavaVMOption, mtArguments> options(2); 3236 3237 // some pointers to help with parsing 3238 char *buffer_end = buffer + buf_len; 3239 char *opt_hd = buffer; 3240 char *wrt = buffer; 3241 char *rd = buffer; 3242 3243 // parse all options 3244 while (rd < buffer_end) { 3245 // skip leading white space from the input string 3246 while (rd < buffer_end && isspace((unsigned char) *rd)) { 3247 rd++; 3248 } 3249 3250 if (rd >= buffer_end) { 3251 break; 3252 } 3253 3254 // Remember this is where we found the head of the token. 3255 opt_hd = wrt; 3256 3257 // Tokens are strings of non white space characters separated 3258 // by one or more white spaces. 3259 while (rd < buffer_end && !isspace((unsigned char) *rd)) { 3260 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3261 int quote = *rd; // matching quote to look for 3262 rd++; // don't copy open quote 3263 while (rd < buffer_end && *rd != quote) { 3264 // include everything (even spaces) 3265 // up until the close quote 3266 *wrt++ = *rd++; // copy to option string 3267 } 3268 3269 if (rd < buffer_end) { 3270 rd++; // don't copy close quote 3271 } else { 3272 // did not see closing quote 3273 jio_fprintf(defaultStream::error_stream(), 3274 "Unmatched quote in %s\n", name); 3275 return JNI_ERR; 3276 } 3277 } else { 3278 *wrt++ = *rd++; // copy to option string 3279 } 3280 } 3281 3282 // steal a white space character and set it to null 3283 *wrt++ = '\0'; 3284 // We now have a complete token 3285 3286 JavaVMOption option; 3287 option.optionString = opt_hd; 3288 option.extraInfo = nullptr; 3289 3290 options.append(option); // Fill in option 3291 3292 rd++; // Advance to next character 3293 } 3294 3295 // Fill out JavaVMInitArgs structure. 3296 return vm_args->set_args(&options); 3297 } 3298 3299 #ifndef PRODUCT 3300 // Determine whether LogVMOutput should be implicitly turned on. 3301 static bool use_vm_log() { 3302 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 3303 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 3304 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 3305 PrintAssembly || TraceDeoptimization || 3306 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 3307 return true; 3308 } 3309 3310 #ifdef COMPILER1 3311 if (PrintC1Statistics) { 3312 return true; 3313 } 3314 #endif // COMPILER1 3315 3316 #ifdef COMPILER2 3317 if (PrintOptoAssembly || PrintOptoStatistics) { 3318 return true; 3319 } 3320 #endif // COMPILER2 3321 3322 return false; 3323 } 3324 3325 #endif // PRODUCT 3326 3327 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 3328 for (int index = 0; index < args->nOptions; index++) { 3329 const JavaVMOption* option = args->options + index; 3330 const char* tail; 3331 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3332 return true; 3333 } 3334 } 3335 return false; 3336 } 3337 3338 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 3339 const char* vm_options_file, 3340 const int vm_options_file_pos, 3341 ScopedVMInitArgs* vm_options_file_args, 3342 ScopedVMInitArgs* args_out) { 3343 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 3344 if (code != JNI_OK) { 3345 return code; 3346 } 3347 3348 if (vm_options_file_args->get()->nOptions < 1) { 3349 return JNI_OK; 3350 } 3351 3352 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 3353 jio_fprintf(defaultStream::error_stream(), 3354 "A VM options file may not refer to a VM options file. " 3355 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 3356 "options file '%s' in options container '%s' is an error.\n", 3357 vm_options_file_args->vm_options_file_arg(), 3358 vm_options_file_args->container_name()); 3359 return JNI_EINVAL; 3360 } 3361 3362 return args_out->insert(args, vm_options_file_args->get(), 3363 vm_options_file_pos); 3364 } 3365 3366 // Expand -XX:VMOptionsFile found in args_in as needed. 3367 // mod_args and args_out parameters may return values as needed. 3368 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 3369 ScopedVMInitArgs* mod_args, 3370 JavaVMInitArgs** args_out) { 3371 jint code = match_special_option_and_act(args_in, mod_args); 3372 if (code != JNI_OK) { 3373 return code; 3374 } 3375 3376 if (mod_args->is_set()) { 3377 // args_in contains -XX:VMOptionsFile and mod_args contains the 3378 // original options from args_in along with the options expanded 3379 // from the VMOptionsFile. Return a short-hand to the caller. 3380 *args_out = mod_args->get(); 3381 } else { 3382 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 3383 } 3384 return JNI_OK; 3385 } 3386 3387 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 3388 ScopedVMInitArgs* args_out) { 3389 // Remaining part of option string 3390 const char* tail; 3391 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 3392 3393 for (int index = 0; index < args->nOptions; index++) { 3394 const JavaVMOption* option = args->options + index; 3395 if (match_option(option, "-XX:Flags=", &tail)) { 3396 Arguments::set_jvm_flags_file(tail); 3397 continue; 3398 } 3399 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 3400 if (vm_options_file_args.found_vm_options_file_arg()) { 3401 jio_fprintf(defaultStream::error_stream(), 3402 "The option '%s' is already specified in the options " 3403 "container '%s' so the specification of '%s' in the " 3404 "same options container is an error.\n", 3405 vm_options_file_args.vm_options_file_arg(), 3406 vm_options_file_args.container_name(), 3407 option->optionString); 3408 return JNI_EINVAL; 3409 } 3410 vm_options_file_args.set_vm_options_file_arg(option->optionString); 3411 // If there's a VMOptionsFile, parse that 3412 jint code = insert_vm_options_file(args, tail, index, 3413 &vm_options_file_args, args_out); 3414 if (code != JNI_OK) { 3415 return code; 3416 } 3417 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 3418 if (args_out->is_set()) { 3419 // The VMOptions file inserted some options so switch 'args' 3420 // to the new set of options, and continue processing which 3421 // preserves "last option wins" semantics. 3422 args = args_out->get(); 3423 // The first option from the VMOptionsFile replaces the 3424 // current option. So we back track to process the 3425 // replacement option. 3426 index--; 3427 } 3428 continue; 3429 } 3430 if (match_option(option, "-XX:+PrintVMOptions")) { 3431 PrintVMOptions = true; 3432 continue; 3433 } 3434 if (match_option(option, "-XX:-PrintVMOptions")) { 3435 PrintVMOptions = false; 3436 continue; 3437 } 3438 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 3439 IgnoreUnrecognizedVMOptions = true; 3440 continue; 3441 } 3442 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 3443 IgnoreUnrecognizedVMOptions = false; 3444 continue; 3445 } 3446 if (match_option(option, "-XX:+PrintFlagsInitial")) { 3447 JVMFlag::printFlags(tty, false); 3448 vm_exit(0); 3449 } 3450 3451 #ifndef PRODUCT 3452 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 3453 JVMFlag::printFlags(tty, true); 3454 vm_exit(0); 3455 } 3456 #endif 3457 } 3458 return JNI_OK; 3459 } 3460 3461 static void print_options(const JavaVMInitArgs *args) { 3462 const char* tail; 3463 for (int index = 0; index < args->nOptions; index++) { 3464 const JavaVMOption *option = args->options + index; 3465 if (match_option(option, "-XX:", &tail)) { 3466 logOption(tail); 3467 } 3468 } 3469 } 3470 3471 bool Arguments::handle_deprecated_print_gc_flags() { 3472 if (PrintGC) { 3473 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 3474 } 3475 if (PrintGCDetails) { 3476 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 3477 } 3478 3479 if (_legacyGCLogging.lastFlag == 2) { 3480 // -Xloggc was used to specify a filename 3481 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 3482 3483 LogTarget(Error, logging) target; 3484 LogStream errstream(target); 3485 return LogConfiguration::parse_log_arguments(_legacyGCLogging.file, gc_conf, nullptr, nullptr, &errstream); 3486 } else if (PrintGC || PrintGCDetails || (_legacyGCLogging.lastFlag == 1)) { 3487 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 3488 } 3489 return true; 3490 } 3491 3492 static void apply_debugger_ergo() { 3493 #ifdef ASSERT 3494 if (ReplayCompiles) { 3495 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo, true); 3496 } 3497 3498 if (UseDebuggerErgo) { 3499 // Turn on sub-flags 3500 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo1, true); 3501 FLAG_SET_ERGO_IF_DEFAULT(UseDebuggerErgo2, true); 3502 } 3503 3504 if (UseDebuggerErgo2) { 3505 // Debugging with limited number of CPUs 3506 FLAG_SET_ERGO_IF_DEFAULT(UseNUMA, false); 3507 FLAG_SET_ERGO_IF_DEFAULT(ConcGCThreads, 1); 3508 FLAG_SET_ERGO_IF_DEFAULT(ParallelGCThreads, 1); 3509 FLAG_SET_ERGO_IF_DEFAULT(CICompilerCount, 2); 3510 } 3511 #endif // ASSERT 3512 } 3513 3514 // Parse entry point called from JNI_CreateJavaVM 3515 3516 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 3517 assert(verify_special_jvm_flags(false), "deprecated and obsolete flag table inconsistent"); 3518 JVMFlag::check_all_flag_declarations(); 3519 3520 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 3521 const char* hotspotrc = ".hotspotrc"; 3522 bool settings_file_specified = false; 3523 bool needs_hotspotrc_warning = false; 3524 ScopedVMInitArgs initial_vm_options_args(""); 3525 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3526 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 3527 3528 // Pointers to current working set of containers 3529 JavaVMInitArgs* cur_cmd_args; 3530 JavaVMInitArgs* cur_vm_options_args; 3531 JavaVMInitArgs* cur_java_options_args; 3532 JavaVMInitArgs* cur_java_tool_options_args; 3533 3534 // Containers for modified/expanded options 3535 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 3536 ScopedVMInitArgs mod_vm_options_args("vm_options_args"); 3537 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 3538 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 3539 3540 3541 jint code = 3542 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 3543 if (code != JNI_OK) { 3544 return code; 3545 } 3546 3547 code = parse_java_options_environment_variable(&initial_java_options_args); 3548 if (code != JNI_OK) { 3549 return code; 3550 } 3551 3552 // Parse the options in the /java.base/jdk/internal/vm/options resource, if present 3553 char *vmoptions = ClassLoader::lookup_vm_options(); 3554 if (vmoptions != nullptr) { 3555 code = parse_options_buffer("vm options resource", vmoptions, strlen(vmoptions), &initial_vm_options_args); 3556 FREE_C_HEAP_ARRAY(char, vmoptions); 3557 if (code != JNI_OK) { 3558 return code; 3559 } 3560 } 3561 3562 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 3563 &mod_java_tool_options_args, 3564 &cur_java_tool_options_args); 3565 if (code != JNI_OK) { 3566 return code; 3567 } 3568 3569 code = expand_vm_options_as_needed(initial_cmd_args, 3570 &mod_cmd_args, 3571 &cur_cmd_args); 3572 if (code != JNI_OK) { 3573 return code; 3574 } 3575 3576 code = expand_vm_options_as_needed(initial_java_options_args.get(), 3577 &mod_java_options_args, 3578 &cur_java_options_args); 3579 if (code != JNI_OK) { 3580 return code; 3581 } 3582 3583 code = expand_vm_options_as_needed(initial_vm_options_args.get(), 3584 &mod_vm_options_args, 3585 &cur_vm_options_args); 3586 if (code != JNI_OK) { 3587 return code; 3588 } 3589 3590 const char* flags_file = Arguments::get_jvm_flags_file(); 3591 settings_file_specified = (flags_file != nullptr); 3592 3593 if (IgnoreUnrecognizedVMOptions) { 3594 cur_cmd_args->ignoreUnrecognized = true; 3595 cur_java_tool_options_args->ignoreUnrecognized = true; 3596 cur_java_options_args->ignoreUnrecognized = true; 3597 } 3598 3599 // Parse specified settings file 3600 if (settings_file_specified) { 3601 if (!process_settings_file(flags_file, true, 3602 cur_cmd_args->ignoreUnrecognized)) { 3603 return JNI_EINVAL; 3604 } 3605 } else { 3606 #ifdef ASSERT 3607 // Parse default .hotspotrc settings file 3608 if (!process_settings_file(".hotspotrc", false, 3609 cur_cmd_args->ignoreUnrecognized)) { 3610 return JNI_EINVAL; 3611 } 3612 #else 3613 struct stat buf; 3614 if (os::stat(hotspotrc, &buf) == 0) { 3615 needs_hotspotrc_warning = true; 3616 } 3617 #endif 3618 } 3619 3620 if (PrintVMOptions) { 3621 print_options(cur_java_tool_options_args); 3622 print_options(cur_cmd_args); 3623 print_options(cur_java_options_args); 3624 } 3625 3626 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 3627 jint result = parse_vm_init_args(cur_vm_options_args, 3628 cur_java_tool_options_args, 3629 cur_java_options_args, 3630 cur_cmd_args); 3631 3632 if (result != JNI_OK) { 3633 return result; 3634 } 3635 3636 // Delay warning until here so that we've had a chance to process 3637 // the -XX:-PrintWarnings flag 3638 if (needs_hotspotrc_warning) { 3639 warning("%s file is present but has been ignored. " 3640 "Run with -XX:Flags=%s to load the file.", 3641 hotspotrc, hotspotrc); 3642 } 3643 3644 if (needs_module_property_warning) { 3645 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 3646 " names that are reserved for internal use."); 3647 } 3648 3649 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 3650 UNSUPPORTED_OPTION(UseLargePages); 3651 #endif 3652 3653 #if defined(AIX) 3654 UNSUPPORTED_OPTION_NULL(AllocateHeapAt); 3655 #endif 3656 3657 #ifndef PRODUCT 3658 if (TraceBytecodesAt != 0) { 3659 TraceBytecodes = true; 3660 } 3661 #endif // PRODUCT 3662 3663 if (ScavengeRootsInCode == 0) { 3664 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 3665 warning("Forcing ScavengeRootsInCode non-zero"); 3666 } 3667 ScavengeRootsInCode = 1; 3668 } 3669 3670 if (!handle_deprecated_print_gc_flags()) { 3671 return JNI_EINVAL; 3672 } 3673 3674 // Set object alignment values. 3675 set_object_alignment(); 3676 3677 #if !INCLUDE_CDS 3678 if (CDSConfig::is_dumping_static_archive() || RequireSharedSpaces) { 3679 jio_fprintf(defaultStream::error_stream(), 3680 "Shared spaces are not supported in this VM\n"); 3681 return JNI_ERR; 3682 } 3683 if (DumpLoadedClassList != nullptr) { 3684 jio_fprintf(defaultStream::error_stream(), 3685 "DumpLoadedClassList is not supported in this VM\n"); 3686 return JNI_ERR; 3687 } 3688 if ((CDSConfig::is_using_archive() && xshare_auto_cmd_line) || 3689 log_is_enabled(Info, cds)) { 3690 warning("Shared spaces are not supported in this VM"); 3691 UseSharedSpaces = false; 3692 LogConfiguration::configure_stdout(LogLevel::Off, true, LOG_TAGS(cds)); 3693 } 3694 no_shared_spaces("CDS Disabled"); 3695 #endif // INCLUDE_CDS 3696 3697 // Verify NMT arguments 3698 const NMT_TrackingLevel lvl = NMTUtil::parse_tracking_level(NativeMemoryTracking); 3699 if (lvl == NMT_unknown) { 3700 jio_fprintf(defaultStream::error_stream(), 3701 "Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]\n"); 3702 return JNI_ERR; 3703 } 3704 if (PrintNMTStatistics && lvl == NMT_off) { 3705 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 3706 FLAG_SET_DEFAULT(PrintNMTStatistics, false); 3707 } 3708 3709 bool trace_dependencies = log_is_enabled(Debug, dependencies); 3710 if (trace_dependencies && VerifyDependencies) { 3711 warning("dependency logging results may be inflated by VerifyDependencies"); 3712 } 3713 3714 bool log_class_load_cause = log_is_enabled(Info, class, load, cause, native) || 3715 log_is_enabled(Info, class, load, cause); 3716 if (log_class_load_cause && LogClassLoadingCauseFor == nullptr) { 3717 warning("class load cause logging will not produce output without LogClassLoadingCauseFor"); 3718 } 3719 3720 apply_debugger_ergo(); 3721 3722 // The VMThread needs to stop now and then to execute these debug options. 3723 if ((HandshakeALot || SafepointALot) && FLAG_IS_DEFAULT(GuaranteedSafepointInterval)) { 3724 FLAG_SET_DEFAULT(GuaranteedSafepointInterval, 1000); 3725 } 3726 3727 if (log_is_enabled(Info, arguments)) { 3728 LogStream st(Log(arguments)::info()); 3729 Arguments::print_on(&st); 3730 } 3731 3732 return JNI_OK; 3733 } 3734 3735 void Arguments::set_compact_headers_flags() { 3736 #ifdef _LP64 3737 if (UseCompactObjectHeaders && FLAG_IS_CMDLINE(UseCompressedClassPointers) && !UseCompressedClassPointers) { 3738 warning("Compact object headers require compressed class pointers. Disabling compact object headers."); 3739 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false); 3740 } 3741 if (UseCompactObjectHeaders && !UseObjectMonitorTable) { 3742 // If UseCompactObjectHeaders is on the command line, turn on UseObjectMonitorTable. 3743 if (FLAG_IS_CMDLINE(UseCompactObjectHeaders)) { 3744 FLAG_SET_DEFAULT(UseObjectMonitorTable, true); 3745 3746 // If UseObjectMonitorTable is on the command line, turn off UseCompactObjectHeaders. 3747 } else if (FLAG_IS_CMDLINE(UseObjectMonitorTable)) { 3748 FLAG_SET_DEFAULT(UseCompactObjectHeaders, false); 3749 // If neither on the command line, the defaults are incompatible, but turn on UseObjectMonitorTable. 3750 } else { 3751 FLAG_SET_DEFAULT(UseObjectMonitorTable, true); 3752 } 3753 } 3754 if (UseCompactObjectHeaders && LockingMode != LM_LIGHTWEIGHT) { 3755 FLAG_SET_DEFAULT(LockingMode, LM_LIGHTWEIGHT); 3756 } 3757 if (UseCompactObjectHeaders && !UseCompressedClassPointers) { 3758 FLAG_SET_DEFAULT(UseCompressedClassPointers, true); 3759 } 3760 #endif 3761 } 3762 3763 jint Arguments::apply_ergo() { 3764 // Set flags based on ergonomics. 3765 jint result = set_ergonomics_flags(); 3766 if (result != JNI_OK) return result; 3767 3768 // Set heap size based on available physical memory 3769 set_heap_size(); 3770 3771 GCConfig::arguments()->initialize(); 3772 3773 set_compact_headers_flags(); 3774 3775 if (UseCompressedClassPointers) { 3776 CompressedKlassPointers::pre_initialize(); 3777 } 3778 3779 CDSConfig::initialize(); 3780 3781 // Initialize Metaspace flags and alignments 3782 Metaspace::ergo_initialize(); 3783 3784 if (!StringDedup::ergo_initialize()) { 3785 return JNI_EINVAL; 3786 } 3787 3788 // Set compiler flags after GC is selected and GC specific 3789 // flags (LoopStripMiningIter) are set. 3790 CompilerConfig::ergo_initialize(); 3791 3792 // Set bytecode rewriting flags 3793 set_bytecode_flags(); 3794 3795 // Set flags if aggressive optimization flags are enabled 3796 jint code = set_aggressive_opts_flags(); 3797 if (code != JNI_OK) { 3798 return code; 3799 } 3800 3801 if (FLAG_IS_DEFAULT(UseSecondarySupersTable)) { 3802 FLAG_SET_DEFAULT(UseSecondarySupersTable, VM_Version::supports_secondary_supers_table()); 3803 } else if (UseSecondarySupersTable && !VM_Version::supports_secondary_supers_table()) { 3804 warning("UseSecondarySupersTable is not supported"); 3805 FLAG_SET_DEFAULT(UseSecondarySupersTable, false); 3806 } 3807 if (!UseSecondarySupersTable) { 3808 FLAG_SET_DEFAULT(StressSecondarySupers, false); 3809 FLAG_SET_DEFAULT(VerifySecondarySupers, false); 3810 } 3811 3812 #ifdef ZERO 3813 // Clear flags not supported on zero. 3814 FLAG_SET_DEFAULT(ProfileInterpreter, false); 3815 #endif // ZERO 3816 3817 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 3818 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 3819 DebugNonSafepoints = true; 3820 } 3821 3822 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 3823 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 3824 } 3825 3826 // Treat the odd case where local verification is enabled but remote 3827 // verification is not as if both were enabled. 3828 if (BytecodeVerificationLocal && !BytecodeVerificationRemote) { 3829 log_info(verification)("Turning on remote verification because local verification is on"); 3830 FLAG_SET_DEFAULT(BytecodeVerificationRemote, true); 3831 } 3832 if (!EnableValhalla || (is_interpreter_only() && !CDSConfig::is_dumping_archive() && !UseSharedSpaces)) { 3833 // Disable calling convention optimizations if inline types are not supported. 3834 // Also these aren't useful in -Xint. However, don't disable them when dumping or using 3835 // the CDS archive, as the values must match between dumptime and runtime. 3836 InlineTypePassFieldsAsArgs = false; 3837 InlineTypeReturnedAsFields = false; 3838 } 3839 3840 #ifndef PRODUCT 3841 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 3842 if (use_vm_log()) { 3843 LogVMOutput = true; 3844 } 3845 } 3846 #endif // PRODUCT 3847 3848 if (PrintCommandLineFlags) { 3849 JVMFlag::printSetFlags(tty); 3850 } 3851 3852 #if COMPILER2_OR_JVMCI 3853 if (!FLAG_IS_DEFAULT(EnableVectorSupport) && !EnableVectorSupport) { 3854 if (!FLAG_IS_DEFAULT(EnableVectorReboxing) && EnableVectorReboxing) { 3855 warning("Disabling EnableVectorReboxing since EnableVectorSupport is turned off."); 3856 } 3857 FLAG_SET_DEFAULT(EnableVectorReboxing, false); 3858 3859 if (!FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing) && EnableVectorAggressiveReboxing) { 3860 if (!EnableVectorReboxing) { 3861 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorReboxing is turned off."); 3862 } else { 3863 warning("Disabling EnableVectorAggressiveReboxing since EnableVectorSupport is turned off."); 3864 } 3865 } 3866 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, false); 3867 3868 if (!FLAG_IS_DEFAULT(UseVectorStubs) && UseVectorStubs) { 3869 warning("Disabling UseVectorStubs since EnableVectorSupport is turned off."); 3870 } 3871 FLAG_SET_DEFAULT(UseVectorStubs, false); 3872 } 3873 #endif // COMPILER2_OR_JVMCI 3874 3875 if (log_is_enabled(Info, perf, class, link)) { 3876 if (!UsePerfData) { 3877 warning("Disabling -Xlog:perf+class+link since UsePerfData is turned off."); 3878 LogConfiguration::configure_stdout(LogLevel::Off, false, LOG_TAGS(perf, class, link)); 3879 } 3880 } 3881 3882 if (FLAG_IS_CMDLINE(DiagnoseSyncOnValueBasedClasses)) { 3883 if (DiagnoseSyncOnValueBasedClasses == ObjectSynchronizer::LOG_WARNING && !log_is_enabled(Info, valuebasedclasses)) { 3884 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(valuebasedclasses)); 3885 } 3886 } 3887 return JNI_OK; 3888 } 3889 3890 jint Arguments::adjust_after_os() { 3891 if (UseNUMA) { 3892 if (UseParallelGC) { 3893 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 3894 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 3895 } 3896 } 3897 } 3898 return JNI_OK; 3899 } 3900 3901 int Arguments::PropertyList_count(SystemProperty* pl) { 3902 int count = 0; 3903 while(pl != nullptr) { 3904 count++; 3905 pl = pl->next(); 3906 } 3907 return count; 3908 } 3909 3910 // Return the number of readable properties. 3911 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 3912 int count = 0; 3913 while(pl != nullptr) { 3914 if (pl->readable()) { 3915 count++; 3916 } 3917 pl = pl->next(); 3918 } 3919 return count; 3920 } 3921 3922 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 3923 assert(key != nullptr, "just checking"); 3924 SystemProperty* prop; 3925 for (prop = pl; prop != nullptr; prop = prop->next()) { 3926 if (strcmp(key, prop->key()) == 0) return prop->value(); 3927 } 3928 return nullptr; 3929 } 3930 3931 // Return the value of the requested property provided that it is a readable property. 3932 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 3933 assert(key != nullptr, "just checking"); 3934 SystemProperty* prop; 3935 // Return the property value if the keys match and the property is not internal or 3936 // it's the special internal property "jdk.boot.class.path.append". 3937 for (prop = pl; prop != nullptr; prop = prop->next()) { 3938 if (strcmp(key, prop->key()) == 0) { 3939 if (!prop->internal()) { 3940 return prop->value(); 3941 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 3942 return prop->value(); 3943 } else { 3944 // Property is internal and not jdk.boot.class.path.append so return null. 3945 return nullptr; 3946 } 3947 } 3948 } 3949 return nullptr; 3950 } 3951 3952 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 3953 SystemProperty* p = *plist; 3954 if (p == nullptr) { 3955 *plist = new_p; 3956 } else { 3957 while (p->next() != nullptr) { 3958 p = p->next(); 3959 } 3960 p->set_next(new_p); 3961 } 3962 } 3963 3964 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 3965 bool writeable, bool internal) { 3966 if (plist == nullptr) 3967 return; 3968 3969 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 3970 PropertyList_add(plist, new_p); 3971 } 3972 3973 void Arguments::PropertyList_add(SystemProperty *element) { 3974 PropertyList_add(&_system_properties, element); 3975 } 3976 3977 // This add maintains unique property key in the list. 3978 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 3979 PropertyAppendable append, PropertyWriteable writeable, 3980 PropertyInternal internal) { 3981 if (plist == nullptr) 3982 return; 3983 3984 // If property key exists and is writeable, then update with new value. 3985 // Trying to update a non-writeable property is silently ignored. 3986 SystemProperty* prop; 3987 for (prop = *plist; prop != nullptr; prop = prop->next()) { 3988 if (strcmp(k, prop->key()) == 0) { 3989 if (append == AppendProperty) { 3990 prop->append_writeable_value(v); 3991 } else { 3992 prop->set_writeable_value(v); 3993 } 3994 return; 3995 } 3996 } 3997 3998 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 3999 } 4000 4001 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4002 // Returns true if all of the source pointed by src has been copied over to 4003 // the destination buffer pointed by buf. Otherwise, returns false. 4004 // Notes: 4005 // 1. If the length (buflen) of the destination buffer excluding the 4006 // null terminator character is not long enough for holding the expanded 4007 // pid characters, it also returns false instead of returning the partially 4008 // expanded one. 4009 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4010 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4011 char* buf, size_t buflen) { 4012 const char* p = src; 4013 char* b = buf; 4014 const char* src_end = &src[srclen]; 4015 char* buf_end = &buf[buflen - 1]; 4016 4017 while (p < src_end && b < buf_end) { 4018 if (*p == '%') { 4019 switch (*(++p)) { 4020 case '%': // "%%" ==> "%" 4021 *b++ = *p++; 4022 break; 4023 case 'p': { // "%p" ==> current process id 4024 // buf_end points to the character before the last character so 4025 // that we could write '\0' to the end of the buffer. 4026 size_t buf_sz = buf_end - b + 1; 4027 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4028 4029 // if jio_snprintf fails or the buffer is not long enough to hold 4030 // the expanded pid, returns false. 4031 if (ret < 0 || ret >= (int)buf_sz) { 4032 return false; 4033 } else { 4034 b += ret; 4035 assert(*b == '\0', "fail in copy_expand_pid"); 4036 if (p == src_end && b == buf_end + 1) { 4037 // reach the end of the buffer. 4038 return true; 4039 } 4040 } 4041 p++; 4042 break; 4043 } 4044 default : 4045 *b++ = '%'; 4046 } 4047 } else { 4048 *b++ = *p++; 4049 } 4050 } 4051 *b = '\0'; 4052 return (p == src_end); // return false if not all of the source was copied 4053 }