1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/javaAssertions.hpp" 28 #include "classfile/moduleEntry.hpp" 29 #include "classfile/stringTable.hpp" 30 #include "classfile/symbolTable.hpp" 31 #include "gc/shared/cardTableRS.hpp" 32 #include "gc/shared/genCollectedHeap.hpp" 33 #include "gc/shared/referenceProcessor.hpp" 34 #include "gc/shared/taskqueue.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logConfiguration.hpp" 37 #include "logging/logStream.hpp" 38 #include "logging/logTag.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/universe.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "prims/jvmtiExport.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/arguments_ext.hpp" 45 #include "runtime/commandLineFlagConstraintList.hpp" 46 #include "runtime/commandLineFlagWriteableList.hpp" 47 #include "runtime/commandLineFlagRangeList.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/globals_extension.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/os.hpp" 52 #include "runtime/vm_version.hpp" 53 #include "services/management.hpp" 54 #include "services/memTracker.hpp" 55 #include "utilities/defaultStream.hpp" 56 #include "utilities/macros.hpp" 57 #include "utilities/stringUtils.hpp" 58 #if INCLUDE_JVMCI 59 #include "jvmci/jvmciRuntime.hpp" 60 #endif 61 #if INCLUDE_ALL_GCS 62 #include "gc/cms/compactibleFreeListSpace.hpp" 63 #include "gc/g1/g1CollectedHeap.inline.hpp" 64 #include "gc/parallel/parallelScavengeHeap.hpp" 65 #endif // INCLUDE_ALL_GCS 66 67 // Note: This is a special bug reporting site for the JVM 68 #define DEFAULT_VENDOR_URL_BUG "http://bugreport.java.com/bugreport/crash.jsp" 69 #define DEFAULT_JAVA_LAUNCHER "generic" 70 71 char* Arguments::_jvm_flags_file = NULL; 72 char** Arguments::_jvm_flags_array = NULL; 73 int Arguments::_num_jvm_flags = 0; 74 char** Arguments::_jvm_args_array = NULL; 75 int Arguments::_num_jvm_args = 0; 76 char* Arguments::_java_command = NULL; 77 SystemProperty* Arguments::_system_properties = NULL; 78 const char* Arguments::_gc_log_filename = NULL; 79 bool Arguments::_has_profile = false; 80 size_t Arguments::_conservative_max_heap_alignment = 0; 81 size_t Arguments::_min_heap_size = 0; 82 Arguments::Mode Arguments::_mode = _mixed; 83 bool Arguments::_java_compiler = false; 84 bool Arguments::_xdebug_mode = false; 85 const char* Arguments::_java_vendor_url_bug = DEFAULT_VENDOR_URL_BUG; 86 const char* Arguments::_sun_java_launcher = DEFAULT_JAVA_LAUNCHER; 87 int Arguments::_sun_java_launcher_pid = -1; 88 bool Arguments::_sun_java_launcher_is_altjvm = false; 89 90 // These parameters are reset in method parse_vm_init_args() 91 bool Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 92 bool Arguments::_UseOnStackReplacement = UseOnStackReplacement; 93 bool Arguments::_BackgroundCompilation = BackgroundCompilation; 94 bool Arguments::_ClipInlining = ClipInlining; 95 intx Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 96 intx Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 97 98 char* Arguments::SharedArchivePath = NULL; 99 100 AgentLibraryList Arguments::_libraryList; 101 AgentLibraryList Arguments::_agentList; 102 103 abort_hook_t Arguments::_abort_hook = NULL; 104 exit_hook_t Arguments::_exit_hook = NULL; 105 vfprintf_hook_t Arguments::_vfprintf_hook = NULL; 106 107 108 SystemProperty *Arguments::_sun_boot_library_path = NULL; 109 SystemProperty *Arguments::_java_library_path = NULL; 110 SystemProperty *Arguments::_java_home = NULL; 111 SystemProperty *Arguments::_java_class_path = NULL; 112 SystemProperty *Arguments::_jdk_boot_class_path_append = NULL; 113 114 GrowableArray<ModulePatchPath*> *Arguments::_patch_mod_prefix = NULL; 115 PathString *Arguments::_system_boot_class_path = NULL; 116 bool Arguments::_has_jimage = false; 117 118 char* Arguments::_ext_dirs = NULL; 119 120 // Check if head of 'option' matches 'name', and sets 'tail' to the remaining 121 // part of the option string. 122 static bool match_option(const JavaVMOption *option, const char* name, 123 const char** tail) { 124 size_t len = strlen(name); 125 if (strncmp(option->optionString, name, len) == 0) { 126 *tail = option->optionString + len; 127 return true; 128 } else { 129 return false; 130 } 131 } 132 133 // Check if 'option' matches 'name'. No "tail" is allowed. 134 static bool match_option(const JavaVMOption *option, const char* name) { 135 const char* tail = NULL; 136 bool result = match_option(option, name, &tail); 137 if (tail != NULL && *tail == '\0') { 138 return result; 139 } else { 140 return false; 141 } 142 } 143 144 // Return true if any of the strings in null-terminated array 'names' matches. 145 // If tail_allowed is true, then the tail must begin with a colon; otherwise, 146 // the option must match exactly. 147 static bool match_option(const JavaVMOption* option, const char** names, const char** tail, 148 bool tail_allowed) { 149 for (/* empty */; *names != NULL; ++names) { 150 if (match_option(option, *names, tail)) { 151 if (**tail == '\0' || tail_allowed && **tail == ':') { 152 return true; 153 } 154 } 155 } 156 return false; 157 } 158 159 static void logOption(const char* opt) { 160 if (PrintVMOptions) { 161 jio_fprintf(defaultStream::output_stream(), "VM option '%s'\n", opt); 162 } 163 } 164 165 bool needs_module_property_warning = false; 166 167 #define MODULE_PROPERTY_PREFIX "jdk.module." 168 #define MODULE_PROPERTY_PREFIX_LEN 11 169 #define ADDEXPORTS "addexports" 170 #define ADDEXPORTS_LEN 10 171 #define ADDREADS "addreads" 172 #define ADDREADS_LEN 8 173 #define ADDOPENS "addopens" 174 #define ADDOPENS_LEN 8 175 #define PATCH "patch" 176 #define PATCH_LEN 5 177 #define ADDMODS "addmods" 178 #define ADDMODS_LEN 7 179 #define LIMITMODS "limitmods" 180 #define LIMITMODS_LEN 9 181 #define PATH "path" 182 #define PATH_LEN 4 183 #define UPGRADE_PATH "upgrade.path" 184 #define UPGRADE_PATH_LEN 12 185 186 // Return TRUE if option matches 'property', or 'property=', or 'property.'. 187 static bool matches_property_suffix(const char* option, const char* property, size_t len) { 188 return ((strncmp(option, property, len) == 0) && 189 (option[len] == '=' || option[len] == '.' || option[len] == '\0')); 190 } 191 192 // Return true if property starts with "jdk.module." and its ensuing chars match 193 // any of the reserved module properties. 194 // property should be passed without the leading "-D". 195 bool Arguments::is_internal_module_property(const char* property) { 196 assert((strncmp(property, "-D", 2) != 0), "Unexpected leading -D"); 197 if (strncmp(property, MODULE_PROPERTY_PREFIX, MODULE_PROPERTY_PREFIX_LEN) == 0) { 198 const char* property_suffix = property + MODULE_PROPERTY_PREFIX_LEN; 199 if (matches_property_suffix(property_suffix, ADDEXPORTS, ADDEXPORTS_LEN) || 200 matches_property_suffix(property_suffix, ADDREADS, ADDREADS_LEN) || 201 matches_property_suffix(property_suffix, ADDOPENS, ADDOPENS_LEN) || 202 matches_property_suffix(property_suffix, PATCH, PATCH_LEN) || 203 matches_property_suffix(property_suffix, ADDMODS, ADDMODS_LEN) || 204 matches_property_suffix(property_suffix, LIMITMODS, LIMITMODS_LEN) || 205 matches_property_suffix(property_suffix, PATH, PATH_LEN) || 206 matches_property_suffix(property_suffix, UPGRADE_PATH, UPGRADE_PATH_LEN)) { 207 return true; 208 } 209 } 210 return false; 211 } 212 213 // Process java launcher properties. 214 void Arguments::process_sun_java_launcher_properties(JavaVMInitArgs* args) { 215 // See if sun.java.launcher, sun.java.launcher.is_altjvm or 216 // sun.java.launcher.pid is defined. 217 // Must do this before setting up other system properties, 218 // as some of them may depend on launcher type. 219 for (int index = 0; index < args->nOptions; index++) { 220 const JavaVMOption* option = args->options + index; 221 const char* tail; 222 223 if (match_option(option, "-Dsun.java.launcher=", &tail)) { 224 process_java_launcher_argument(tail, option->extraInfo); 225 continue; 226 } 227 if (match_option(option, "-Dsun.java.launcher.is_altjvm=", &tail)) { 228 if (strcmp(tail, "true") == 0) { 229 _sun_java_launcher_is_altjvm = true; 230 } 231 continue; 232 } 233 if (match_option(option, "-Dsun.java.launcher.pid=", &tail)) { 234 _sun_java_launcher_pid = atoi(tail); 235 continue; 236 } 237 } 238 } 239 240 // Initialize system properties key and value. 241 void Arguments::init_system_properties() { 242 243 // Set up _system_boot_class_path which is not a property but 244 // relies heavily on argument processing and the jdk.boot.class.path.append 245 // property. It is used to store the underlying system boot class path. 246 _system_boot_class_path = new PathString(NULL); 247 248 PropertyList_add(&_system_properties, new SystemProperty("java.vm.specification.name", 249 "Java Virtual Machine Specification", false)); 250 PropertyList_add(&_system_properties, new SystemProperty("java.vm.version", VM_Version::vm_release(), false)); 251 PropertyList_add(&_system_properties, new SystemProperty("java.vm.name", VM_Version::vm_name(), false)); 252 PropertyList_add(&_system_properties, new SystemProperty("java.vm.info", VM_Version::vm_info_string(), true)); 253 PropertyList_add(&_system_properties, new SystemProperty("jdk.debug", VM_Version::jdk_debug_level(), false)); 254 255 // Following are JVMTI agent writable properties. 256 // Properties values are set to NULL and they are 257 // os specific they are initialized in os::init_system_properties_values(). 258 _sun_boot_library_path = new SystemProperty("sun.boot.library.path", NULL, true); 259 _java_library_path = new SystemProperty("java.library.path", NULL, true); 260 _java_home = new SystemProperty("java.home", NULL, true); 261 _java_class_path = new SystemProperty("java.class.path", "", true); 262 // jdk.boot.class.path.append is a non-writeable, internal property. 263 // It can only be set by either: 264 // - -Xbootclasspath/a: 265 // - AddToBootstrapClassLoaderSearch during JVMTI OnLoad phase 266 _jdk_boot_class_path_append = new SystemProperty("jdk.boot.class.path.append", "", false, true); 267 268 // Add to System Property list. 269 PropertyList_add(&_system_properties, _sun_boot_library_path); 270 PropertyList_add(&_system_properties, _java_library_path); 271 PropertyList_add(&_system_properties, _java_home); 272 PropertyList_add(&_system_properties, _java_class_path); 273 PropertyList_add(&_system_properties, _jdk_boot_class_path_append); 274 275 // Set OS specific system properties values 276 os::init_system_properties_values(); 277 } 278 279 // Update/Initialize System properties after JDK version number is known 280 void Arguments::init_version_specific_system_properties() { 281 enum { bufsz = 16 }; 282 char buffer[bufsz]; 283 const char* spec_vendor = "Oracle Corporation"; 284 uint32_t spec_version = JDK_Version::current().major_version(); 285 286 jio_snprintf(buffer, bufsz, UINT32_FORMAT, spec_version); 287 288 PropertyList_add(&_system_properties, 289 new SystemProperty("java.vm.specification.vendor", spec_vendor, false)); 290 PropertyList_add(&_system_properties, 291 new SystemProperty("java.vm.specification.version", buffer, false)); 292 PropertyList_add(&_system_properties, 293 new SystemProperty("java.vm.vendor", VM_Version::vm_vendor(), false)); 294 } 295 296 /* 297 * -XX argument processing: 298 * 299 * -XX arguments are defined in several places, such as: 300 * globals.hpp, globals_<cpu>.hpp, globals_<os>.hpp, <compiler>_globals.hpp, or <gc>_globals.hpp. 301 * -XX arguments are parsed in parse_argument(). 302 * -XX argument bounds checking is done in check_vm_args_consistency(). 303 * 304 * Over time -XX arguments may change. There are mechanisms to handle common cases: 305 * 306 * ALIASED: An option that is simply another name for another option. This is often 307 * part of the process of deprecating a flag, but not all aliases need 308 * to be deprecated. 309 * 310 * Create an alias for an option by adding the old and new option names to the 311 * "aliased_jvm_flags" table. Delete the old variable from globals.hpp (etc). 312 * 313 * DEPRECATED: An option that is supported, but a warning is printed to let the user know that 314 * support may be removed in the future. Both regular and aliased options may be 315 * deprecated. 316 * 317 * Add a deprecation warning for an option (or alias) by adding an entry in the 318 * "special_jvm_flags" table and setting the "deprecated_in" field. 319 * Often an option "deprecated" in one major release will 320 * be made "obsolete" in the next. In this case the entry should also have it's 321 * "obsolete_in" field set. 322 * 323 * OBSOLETE: An option that has been removed (and deleted from globals.hpp), but is still accepted 324 * on the command line. A warning is printed to let the user know that option might not 325 * be accepted in the future. 326 * 327 * Add an obsolete warning for an option by adding an entry in the "special_jvm_flags" 328 * table and setting the "obsolete_in" field. 329 * 330 * EXPIRED: A deprecated or obsolete option that has an "accept_until" version less than or equal 331 * to the current JDK version. The system will flatly refuse to admit the existence of 332 * the flag. This allows a flag to die automatically over JDK releases. 333 * 334 * Note that manual cleanup of expired options should be done at major JDK version upgrades: 335 * - Newly expired options should be removed from the special_jvm_flags and aliased_jvm_flags tables. 336 * - Newly obsolete or expired deprecated options should have their global variable 337 * definitions removed (from globals.hpp, etc) and related implementations removed. 338 * 339 * Recommended approach for removing options: 340 * 341 * To remove options commonly used by customers (e.g. product, commercial -XX options), use 342 * the 3-step model adding major release numbers to the deprecate, obsolete and expire columns. 343 * 344 * To remove internal options (e.g. diagnostic, experimental, develop options), use 345 * a 2-step model adding major release numbers to the obsolete and expire columns. 346 * 347 * To change the name of an option, use the alias table as well as a 2-step 348 * model adding major release numbers to the deprecate and expire columns. 349 * Think twice about aliasing commonly used customer options. 350 * 351 * There are times when it is appropriate to leave a future release number as undefined. 352 * 353 * Tests: Aliases should be tested in VMAliasOptions.java. 354 * Deprecated options should be tested in VMDeprecatedOptions.java. 355 */ 356 357 // The special_jvm_flags table declares options that are being deprecated and/or obsoleted. The 358 // "deprecated_in" or "obsolete_in" fields may be set to "undefined", but not both. 359 // When the JDK version reaches 'deprecated_in' limit, the JVM will process this flag on 360 // the command-line as usual, but will issue a warning. 361 // When the JDK version reaches 'obsolete_in' limit, the JVM will continue accepting this flag on 362 // the command-line, while issuing a warning and ignoring the flag value. 363 // Once the JDK version reaches 'expired_in' limit, the JVM will flatly refuse to admit the 364 // existence of the flag. 365 // 366 // MANUAL CLEANUP ON JDK VERSION UPDATES: 367 // This table ensures that the handling of options will update automatically when the JDK 368 // version is incremented, but the source code needs to be cleanup up manually: 369 // - As "deprecated" options age into "obsolete" or "expired" options, the associated "globals" 370 // variable should be removed, as well as users of the variable. 371 // - As "deprecated" options age into "obsolete" options, move the entry into the 372 // "Obsolete Flags" section of the table. 373 // - All expired options should be removed from the table. 374 static SpecialFlag const special_jvm_flags[] = { 375 // -------------- Deprecated Flags -------------- 376 // --- Non-alias flags - sorted by obsolete_in then expired_in: 377 { "MaxGCMinorPauseMillis", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 378 379 // --- Deprecated alias flags (see also aliased_jvm_flags) - sorted by obsolete_in then expired_in: 380 { "DefaultMaxRAMFraction", JDK_Version::jdk(8), JDK_Version::undefined(), JDK_Version::undefined() }, 381 { "CreateMinidumpOnCrash", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 382 383 // -------------- Obsolete Flags - sorted by expired_in -------------- 384 { "ConvertSleepToYield", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 385 { "ConvertYieldToSleep", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 386 { "MinSleepInterval", JDK_Version::jdk(9), JDK_Version::jdk(10), JDK_Version::jdk(11) }, 387 { "PermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 388 { "MaxPermSize", JDK_Version::undefined(), JDK_Version::jdk(8), JDK_Version::undefined() }, 389 390 #ifdef TEST_VERIFY_SPECIAL_JVM_FLAGS 391 { "dep > obs", JDK_Version::jdk(9), JDK_Version::jdk(8), JDK_Version::undefined() }, 392 { "dep > exp ", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::jdk(8) }, 393 { "obs > exp ", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::jdk(8) }, 394 { "not deprecated or obsolete", JDK_Version::undefined(), JDK_Version::undefined(), JDK_Version::jdk(9) }, 395 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 396 { "dup option", JDK_Version::jdk(9), JDK_Version::undefined(), JDK_Version::undefined() }, 397 { "BytecodeVerificationRemote", JDK_Version::undefined(), JDK_Version::jdk(9), JDK_Version::undefined() }, 398 #endif 399 400 { NULL, JDK_Version(0), JDK_Version(0) } 401 }; 402 403 // Flags that are aliases for other flags. 404 typedef struct { 405 const char* alias_name; 406 const char* real_name; 407 } AliasedFlag; 408 409 static AliasedFlag const aliased_jvm_flags[] = { 410 { "DefaultMaxRAMFraction", "MaxRAMFraction" }, 411 { "CreateMinidumpOnCrash", "CreateCoredumpOnCrash" }, 412 { NULL, NULL} 413 }; 414 415 // NOTE: A compatibility request will be necessary for each alias to be removed. 416 static AliasedLoggingFlag const aliased_logging_flags[] = { 417 { "PrintCompressedOopsMode", LogLevel::Info, true, LOG_TAGS(gc, heap, coops) }, 418 { "TraceBiasedLocking", LogLevel::Info, true, LOG_TAGS(biasedlocking) }, 419 { "TraceClassLoading", LogLevel::Info, true, LOG_TAGS(class, load) }, 420 { "TraceClassLoadingPreorder", LogLevel::Debug, true, LOG_TAGS(class, preorder) }, 421 { "TraceClassPaths", LogLevel::Info, true, LOG_TAGS(class, path) }, 422 { "TraceClassResolution", LogLevel::Debug, true, LOG_TAGS(class, resolve) }, 423 { "TraceClassUnloading", LogLevel::Info, true, LOG_TAGS(class, unload) }, 424 { "TraceExceptions", LogLevel::Info, true, LOG_TAGS(exceptions) }, 425 { "TraceLoaderConstraints", LogLevel::Info, true, LOG_TAGS(class, loader, constraints) }, 426 { "TraceMonitorInflation", LogLevel::Debug, true, LOG_TAGS(monitorinflation) }, 427 { "TraceSafepointCleanupTime", LogLevel::Info, true, LOG_TAGS(safepoint, cleanup) }, 428 { "TraceJVMTIObjectTagging", LogLevel::Debug, true, LOG_TAGS(jvmti, objecttagging) }, 429 { "TraceRedefineClasses", LogLevel::Info, false, LOG_TAGS(redefine, class) }, 430 { NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG) } 431 }; 432 433 #ifndef PRODUCT 434 // These options are removed in jdk9. Remove this code for jdk10. 435 static AliasedFlag const removed_develop_logging_flags[] = { 436 { "TraceClassInitialization", "-Xlog:class+init" }, 437 { "TraceClassLoaderData", "-Xlog:class+loader+data" }, 438 { "TraceDefaultMethods", "-Xlog:defaultmethods=debug" }, 439 { "TraceItables", "-Xlog:itables=debug" }, 440 { "TraceMonitorMismatch", "-Xlog:monitormismatch=info" }, 441 { "TraceSafepoint", "-Xlog:safepoint=debug" }, 442 { "TraceStartupTime", "-Xlog:startuptime" }, 443 { "TraceVMOperation", "-Xlog:vmoperation=debug" }, 444 { "PrintVtables", "-Xlog:vtables=debug" }, 445 { "VerboseVerification", "-Xlog:verification" }, 446 { NULL, NULL } 447 }; 448 #endif //PRODUCT 449 450 // Return true if "v" is less than "other", where "other" may be "undefined". 451 static bool version_less_than(JDK_Version v, JDK_Version other) { 452 assert(!v.is_undefined(), "must be defined"); 453 if (!other.is_undefined() && v.compare(other) >= 0) { 454 return false; 455 } else { 456 return true; 457 } 458 } 459 460 extern bool lookup_special_flag_ext(const char *flag_name, SpecialFlag& flag); 461 462 static bool lookup_special_flag(const char *flag_name, SpecialFlag& flag) { 463 // Allow extensions to have priority 464 if (lookup_special_flag_ext(flag_name, flag)) { 465 return true; 466 } 467 468 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 469 if ((strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 470 flag = special_jvm_flags[i]; 471 return true; 472 } 473 } 474 return false; 475 } 476 477 bool Arguments::is_obsolete_flag(const char *flag_name, JDK_Version* version) { 478 assert(version != NULL, "Must provide a version buffer"); 479 SpecialFlag flag; 480 if (lookup_special_flag(flag_name, flag)) { 481 if (!flag.obsolete_in.is_undefined()) { 482 if (version_less_than(JDK_Version::current(), flag.expired_in)) { 483 *version = flag.obsolete_in; 484 return true; 485 } 486 } 487 } 488 return false; 489 } 490 491 int Arguments::is_deprecated_flag(const char *flag_name, JDK_Version* version) { 492 assert(version != NULL, "Must provide a version buffer"); 493 SpecialFlag flag; 494 if (lookup_special_flag(flag_name, flag)) { 495 if (!flag.deprecated_in.is_undefined()) { 496 if (version_less_than(JDK_Version::current(), flag.obsolete_in) && 497 version_less_than(JDK_Version::current(), flag.expired_in)) { 498 *version = flag.deprecated_in; 499 return 1; 500 } else { 501 return -1; 502 } 503 } 504 } 505 return 0; 506 } 507 508 #ifndef PRODUCT 509 const char* Arguments::removed_develop_logging_flag_name(const char* name){ 510 for (size_t i = 0; removed_develop_logging_flags[i].alias_name != NULL; i++) { 511 const AliasedFlag& flag = removed_develop_logging_flags[i]; 512 if (strcmp(flag.alias_name, name) == 0) { 513 return flag.real_name; 514 } 515 } 516 return NULL; 517 } 518 #endif // PRODUCT 519 520 const char* Arguments::real_flag_name(const char *flag_name) { 521 for (size_t i = 0; aliased_jvm_flags[i].alias_name != NULL; i++) { 522 const AliasedFlag& flag_status = aliased_jvm_flags[i]; 523 if (strcmp(flag_status.alias_name, flag_name) == 0) { 524 return flag_status.real_name; 525 } 526 } 527 return flag_name; 528 } 529 530 #ifdef ASSERT 531 static bool lookup_special_flag(const char *flag_name, size_t skip_index) { 532 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 533 if ((i != skip_index) && (strcmp(special_jvm_flags[i].name, flag_name) == 0)) { 534 return true; 535 } 536 } 537 return false; 538 } 539 540 static bool verify_special_jvm_flags() { 541 bool success = true; 542 for (size_t i = 0; special_jvm_flags[i].name != NULL; i++) { 543 const SpecialFlag& flag = special_jvm_flags[i]; 544 if (lookup_special_flag(flag.name, i)) { 545 warning("Duplicate special flag declaration \"%s\"", flag.name); 546 success = false; 547 } 548 if (flag.deprecated_in.is_undefined() && 549 flag.obsolete_in.is_undefined()) { 550 warning("Special flag entry \"%s\" must declare version deprecated and/or obsoleted in.", flag.name); 551 success = false; 552 } 553 554 if (!flag.deprecated_in.is_undefined()) { 555 if (!version_less_than(flag.deprecated_in, flag.obsolete_in)) { 556 warning("Special flag entry \"%s\" must be deprecated before obsoleted.", flag.name); 557 success = false; 558 } 559 560 if (!version_less_than(flag.deprecated_in, flag.expired_in)) { 561 warning("Special flag entry \"%s\" must be deprecated before expired.", flag.name); 562 success = false; 563 } 564 } 565 566 if (!flag.obsolete_in.is_undefined()) { 567 if (!version_less_than(flag.obsolete_in, flag.expired_in)) { 568 warning("Special flag entry \"%s\" must be obsoleted before expired.", flag.name); 569 success = false; 570 } 571 572 // if flag has become obsolete it should not have a "globals" flag defined anymore. 573 if (!version_less_than(JDK_Version::current(), flag.obsolete_in)) { 574 if (Flag::find_flag(flag.name) != NULL) { 575 warning("Global variable for obsolete special flag entry \"%s\" should be removed", flag.name); 576 success = false; 577 } 578 } 579 } 580 581 if (!flag.expired_in.is_undefined()) { 582 // if flag has become expired it should not have a "globals" flag defined anymore. 583 if (!version_less_than(JDK_Version::current(), flag.expired_in)) { 584 if (Flag::find_flag(flag.name) != NULL) { 585 warning("Global variable for expired flag entry \"%s\" should be removed", flag.name); 586 success = false; 587 } 588 } 589 } 590 591 } 592 return success; 593 } 594 #endif 595 596 // Parses a size specification string. 597 bool Arguments::atojulong(const char *s, julong* result) { 598 julong n = 0; 599 600 // First char must be a digit. Don't allow negative numbers or leading spaces. 601 if (!isdigit(*s)) { 602 return false; 603 } 604 605 bool is_hex = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')); 606 char* remainder; 607 errno = 0; 608 n = strtoull(s, &remainder, (is_hex ? 16 : 10)); 609 if (errno != 0) { 610 return false; 611 } 612 613 // Fail if no number was read at all or if the remainder contains more than a single non-digit character. 614 if (remainder == s || strlen(remainder) > 1) { 615 return false; 616 } 617 618 switch (*remainder) { 619 case 'T': case 't': 620 *result = n * G * K; 621 // Check for overflow. 622 if (*result/((julong)G * K) != n) return false; 623 return true; 624 case 'G': case 'g': 625 *result = n * G; 626 if (*result/G != n) return false; 627 return true; 628 case 'M': case 'm': 629 *result = n * M; 630 if (*result/M != n) return false; 631 return true; 632 case 'K': case 'k': 633 *result = n * K; 634 if (*result/K != n) return false; 635 return true; 636 case '\0': 637 *result = n; 638 return true; 639 default: 640 return false; 641 } 642 } 643 644 Arguments::ArgsRange Arguments::check_memory_size(julong size, julong min_size) { 645 if (size < min_size) return arg_too_small; 646 // Check that size will fit in a size_t (only relevant on 32-bit) 647 if (size > max_uintx) return arg_too_big; 648 return arg_in_range; 649 } 650 651 // Describe an argument out of range error 652 void Arguments::describe_range_error(ArgsRange errcode) { 653 switch(errcode) { 654 case arg_too_big: 655 jio_fprintf(defaultStream::error_stream(), 656 "The specified size exceeds the maximum " 657 "representable size.\n"); 658 break; 659 case arg_too_small: 660 case arg_unreadable: 661 case arg_in_range: 662 // do nothing for now 663 break; 664 default: 665 ShouldNotReachHere(); 666 } 667 } 668 669 static bool set_bool_flag(const char* name, bool value, Flag::Flags origin) { 670 if (CommandLineFlags::boolAtPut(name, &value, origin) == Flag::SUCCESS) { 671 return true; 672 } else { 673 return false; 674 } 675 } 676 677 static bool set_fp_numeric_flag(const char* name, char* value, Flag::Flags origin) { 678 char* end; 679 errno = 0; 680 double v = strtod(value, &end); 681 if ((errno != 0) || (*end != 0)) { 682 return false; 683 } 684 685 if (CommandLineFlags::doubleAtPut(name, &v, origin) == Flag::SUCCESS) { 686 return true; 687 } 688 return false; 689 } 690 691 static bool set_numeric_flag(const char* name, char* value, Flag::Flags origin) { 692 julong v; 693 int int_v; 694 intx intx_v; 695 bool is_neg = false; 696 Flag* result = Flag::find_flag(name, strlen(name)); 697 698 if (result == NULL) { 699 return false; 700 } 701 702 // Check the sign first since atojulong() parses only unsigned values. 703 if (*value == '-') { 704 if (!result->is_intx() && !result->is_int()) { 705 return false; 706 } 707 value++; 708 is_neg = true; 709 } 710 if (!Arguments::atojulong(value, &v)) { 711 return false; 712 } 713 if (result->is_int()) { 714 int_v = (int) v; 715 if (is_neg) { 716 int_v = -int_v; 717 } 718 return CommandLineFlags::intAtPut(result, &int_v, origin) == Flag::SUCCESS; 719 } else if (result->is_uint()) { 720 uint uint_v = (uint) v; 721 return CommandLineFlags::uintAtPut(result, &uint_v, origin) == Flag::SUCCESS; 722 } else if (result->is_intx()) { 723 intx_v = (intx) v; 724 if (is_neg) { 725 intx_v = -intx_v; 726 } 727 return CommandLineFlags::intxAtPut(result, &intx_v, origin) == Flag::SUCCESS; 728 } else if (result->is_uintx()) { 729 uintx uintx_v = (uintx) v; 730 return CommandLineFlags::uintxAtPut(result, &uintx_v, origin) == Flag::SUCCESS; 731 } else if (result->is_uint64_t()) { 732 uint64_t uint64_t_v = (uint64_t) v; 733 return CommandLineFlags::uint64_tAtPut(result, &uint64_t_v, origin) == Flag::SUCCESS; 734 } else if (result->is_size_t()) { 735 size_t size_t_v = (size_t) v; 736 return CommandLineFlags::size_tAtPut(result, &size_t_v, origin) == Flag::SUCCESS; 737 } else { 738 return false; 739 } 740 } 741 742 static bool set_string_flag(const char* name, const char* value, Flag::Flags origin) { 743 if (CommandLineFlags::ccstrAtPut(name, &value, origin) != Flag::SUCCESS) return false; 744 // Contract: CommandLineFlags always returns a pointer that needs freeing. 745 FREE_C_HEAP_ARRAY(char, value); 746 return true; 747 } 748 749 static bool append_to_string_flag(const char* name, const char* new_value, Flag::Flags origin) { 750 const char* old_value = ""; 751 if (CommandLineFlags::ccstrAt(name, &old_value) != Flag::SUCCESS) return false; 752 size_t old_len = old_value != NULL ? strlen(old_value) : 0; 753 size_t new_len = strlen(new_value); 754 const char* value; 755 char* free_this_too = NULL; 756 if (old_len == 0) { 757 value = new_value; 758 } else if (new_len == 0) { 759 value = old_value; 760 } else { 761 size_t length = old_len + 1 + new_len + 1; 762 char* buf = NEW_C_HEAP_ARRAY(char, length, mtArguments); 763 // each new setting adds another LINE to the switch: 764 jio_snprintf(buf, length, "%s\n%s", old_value, new_value); 765 value = buf; 766 free_this_too = buf; 767 } 768 (void) CommandLineFlags::ccstrAtPut(name, &value, origin); 769 // CommandLineFlags always returns a pointer that needs freeing. 770 FREE_C_HEAP_ARRAY(char, value); 771 if (free_this_too != NULL) { 772 // CommandLineFlags made its own copy, so I must delete my own temp. buffer. 773 FREE_C_HEAP_ARRAY(char, free_this_too); 774 } 775 return true; 776 } 777 778 const char* Arguments::handle_aliases_and_deprecation(const char* arg, bool warn) { 779 const char* real_name = real_flag_name(arg); 780 JDK_Version since = JDK_Version(); 781 switch (is_deprecated_flag(arg, &since)) { 782 case -1: 783 return NULL; // obsolete or expired, don't process normally 784 case 0: 785 return real_name; 786 case 1: { 787 if (warn) { 788 char version[256]; 789 since.to_string(version, sizeof(version)); 790 if (real_name != arg) { 791 warning("Option %s was deprecated in version %s and will likely be removed in a future release. Use option %s instead.", 792 arg, version, real_name); 793 } else { 794 warning("Option %s was deprecated in version %s and will likely be removed in a future release.", 795 arg, version); 796 } 797 } 798 return real_name; 799 } 800 } 801 ShouldNotReachHere(); 802 return NULL; 803 } 804 805 void log_deprecated_flag(const char* name, bool on, AliasedLoggingFlag alf) { 806 LogTagType tagSet[] = {alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5}; 807 // Set tagset string buffer at max size of 256, large enough for any alias tagset 808 const int max_tagset_size = 256; 809 int max_tagset_len = max_tagset_size - 1; 810 char tagset_buffer[max_tagset_size]; 811 tagset_buffer[0] = '\0'; 812 813 // Write tag-set for aliased logging option, in string list form 814 int max_tags = sizeof(tagSet)/sizeof(tagSet[0]); 815 for (int i = 0; i < max_tags && tagSet[i] != LogTag::__NO_TAG; i++) { 816 if (i > 0) { 817 strncat(tagset_buffer, "+", max_tagset_len - strlen(tagset_buffer)); 818 } 819 strncat(tagset_buffer, LogTag::name(tagSet[i]), max_tagset_len - strlen(tagset_buffer)); 820 } 821 if (!alf.exactMatch) { 822 strncat(tagset_buffer, "*", max_tagset_len - strlen(tagset_buffer)); 823 } 824 log_warning(arguments)("-XX:%s%s is deprecated. Will use -Xlog:%s=%s instead.", 825 (on) ? "+" : "-", 826 name, 827 tagset_buffer, 828 (on) ? LogLevel::name(alf.level) : "off"); 829 } 830 831 AliasedLoggingFlag Arguments::catch_logging_aliases(const char* name, bool on){ 832 for (size_t i = 0; aliased_logging_flags[i].alias_name != NULL; i++) { 833 const AliasedLoggingFlag& alf = aliased_logging_flags[i]; 834 if (strcmp(alf.alias_name, name) == 0) { 835 log_deprecated_flag(name, on, alf); 836 return alf; 837 } 838 } 839 AliasedLoggingFlag a = {NULL, LogLevel::Off, false, LOG_TAGS(_NO_TAG)}; 840 return a; 841 } 842 843 bool Arguments::parse_argument(const char* arg, Flag::Flags origin) { 844 845 // range of acceptable characters spelled out for portability reasons 846 #define NAME_RANGE "[abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]" 847 #define BUFLEN 255 848 char name[BUFLEN+1]; 849 char dummy; 850 const char* real_name; 851 bool warn_if_deprecated = true; 852 853 if (sscanf(arg, "-%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 854 AliasedLoggingFlag alf = catch_logging_aliases(name, false); 855 if (alf.alias_name != NULL){ 856 LogConfiguration::configure_stdout(LogLevel::Off, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 857 return true; 858 } 859 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 860 if (real_name == NULL) { 861 return false; 862 } 863 return set_bool_flag(real_name, false, origin); 864 } 865 if (sscanf(arg, "+%" XSTR(BUFLEN) NAME_RANGE "%c", name, &dummy) == 1) { 866 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 867 if (alf.alias_name != NULL){ 868 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 869 return true; 870 } 871 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 872 if (real_name == NULL) { 873 return false; 874 } 875 return set_bool_flag(real_name, true, origin); 876 } 877 878 char punct; 879 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "%c", name, &punct) == 2 && punct == '=') { 880 const char* value = strchr(arg, '=') + 1; 881 Flag* flag; 882 883 // this scanf pattern matches both strings (handled here) and numbers (handled later)) 884 AliasedLoggingFlag alf = catch_logging_aliases(name, true); 885 if (alf.alias_name != NULL) { 886 LogConfiguration::configure_stdout(alf.level, alf.exactMatch, alf.tag0, alf.tag1, alf.tag2, alf.tag3, alf.tag4, alf.tag5); 887 return true; 888 } 889 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 890 if (real_name == NULL) { 891 return false; 892 } 893 flag = Flag::find_flag(real_name); 894 if (flag != NULL && flag->is_ccstr()) { 895 if (flag->ccstr_accumulates()) { 896 return append_to_string_flag(real_name, value, origin); 897 } else { 898 if (value[0] == '\0') { 899 value = NULL; 900 } 901 return set_string_flag(real_name, value, origin); 902 } 903 } else { 904 warn_if_deprecated = false; // if arg is deprecated, we've already done warning... 905 } 906 } 907 908 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE ":%c", name, &punct) == 2 && punct == '=') { 909 const char* value = strchr(arg, '=') + 1; 910 // -XX:Foo:=xxx will reset the string flag to the given value. 911 if (value[0] == '\0') { 912 value = NULL; 913 } 914 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 915 if (real_name == NULL) { 916 return false; 917 } 918 return set_string_flag(real_name, value, origin); 919 } 920 921 #define SIGNED_FP_NUMBER_RANGE "[-0123456789.eE+]" 922 #define SIGNED_NUMBER_RANGE "[-0123456789]" 923 #define NUMBER_RANGE "[0123456789eE+-]" 924 char value[BUFLEN + 1]; 925 char value2[BUFLEN + 1]; 926 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_NUMBER_RANGE "." "%" XSTR(BUFLEN) NUMBER_RANGE "%c", name, value, value2, &dummy) == 3) { 927 // Looks like a floating-point number -- try again with more lenient format string 928 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) SIGNED_FP_NUMBER_RANGE "%c", name, value, &dummy) == 2) { 929 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 930 if (real_name == NULL) { 931 return false; 932 } 933 return set_fp_numeric_flag(real_name, value, origin); 934 } 935 } 936 937 #define VALUE_RANGE "[-kmgtxKMGTX0123456789abcdefABCDEF]" 938 if (sscanf(arg, "%" XSTR(BUFLEN) NAME_RANGE "=" "%" XSTR(BUFLEN) VALUE_RANGE "%c", name, value, &dummy) == 2) { 939 real_name = handle_aliases_and_deprecation(name, warn_if_deprecated); 940 if (real_name == NULL) { 941 return false; 942 } 943 return set_numeric_flag(real_name, value, origin); 944 } 945 946 return false; 947 } 948 949 void Arguments::add_string(char*** bldarray, int* count, const char* arg) { 950 assert(bldarray != NULL, "illegal argument"); 951 952 if (arg == NULL) { 953 return; 954 } 955 956 int new_count = *count + 1; 957 958 // expand the array and add arg to the last element 959 if (*bldarray == NULL) { 960 *bldarray = NEW_C_HEAP_ARRAY(char*, new_count, mtArguments); 961 } else { 962 *bldarray = REALLOC_C_HEAP_ARRAY(char*, *bldarray, new_count, mtArguments); 963 } 964 (*bldarray)[*count] = os::strdup_check_oom(arg); 965 *count = new_count; 966 } 967 968 void Arguments::build_jvm_args(const char* arg) { 969 add_string(&_jvm_args_array, &_num_jvm_args, arg); 970 } 971 972 void Arguments::build_jvm_flags(const char* arg) { 973 add_string(&_jvm_flags_array, &_num_jvm_flags, arg); 974 } 975 976 // utility function to return a string that concatenates all 977 // strings in a given char** array 978 const char* Arguments::build_resource_string(char** args, int count) { 979 if (args == NULL || count == 0) { 980 return NULL; 981 } 982 size_t length = 0; 983 for (int i = 0; i < count; i++) { 984 length += strlen(args[i]) + 1; // add 1 for a space or NULL terminating character 985 } 986 char* s = NEW_RESOURCE_ARRAY(char, length); 987 char* dst = s; 988 for (int j = 0; j < count; j++) { 989 size_t offset = strlen(args[j]) + 1; // add 1 for a space or NULL terminating character 990 jio_snprintf(dst, length, "%s ", args[j]); // jio_snprintf will replace the last space character with NULL character 991 dst += offset; 992 length -= offset; 993 } 994 return (const char*) s; 995 } 996 997 void Arguments::print_on(outputStream* st) { 998 st->print_cr("VM Arguments:"); 999 if (num_jvm_flags() > 0) { 1000 st->print("jvm_flags: "); print_jvm_flags_on(st); 1001 st->cr(); 1002 } 1003 if (num_jvm_args() > 0) { 1004 st->print("jvm_args: "); print_jvm_args_on(st); 1005 st->cr(); 1006 } 1007 st->print_cr("java_command: %s", java_command() ? java_command() : "<unknown>"); 1008 if (_java_class_path != NULL) { 1009 char* path = _java_class_path->value(); 1010 st->print_cr("java_class_path (initial): %s", strlen(path) == 0 ? "<not set>" : path ); 1011 } 1012 st->print_cr("Launcher Type: %s", _sun_java_launcher); 1013 } 1014 1015 void Arguments::print_summary_on(outputStream* st) { 1016 // Print the command line. Environment variables that are helpful for 1017 // reproducing the problem are written later in the hs_err file. 1018 // flags are from setting file 1019 if (num_jvm_flags() > 0) { 1020 st->print_raw("Settings File: "); 1021 print_jvm_flags_on(st); 1022 st->cr(); 1023 } 1024 // args are the command line and environment variable arguments. 1025 st->print_raw("Command Line: "); 1026 if (num_jvm_args() > 0) { 1027 print_jvm_args_on(st); 1028 } 1029 // this is the classfile and any arguments to the java program 1030 if (java_command() != NULL) { 1031 st->print("%s", java_command()); 1032 } 1033 st->cr(); 1034 } 1035 1036 void Arguments::print_jvm_flags_on(outputStream* st) { 1037 if (_num_jvm_flags > 0) { 1038 for (int i=0; i < _num_jvm_flags; i++) { 1039 st->print("%s ", _jvm_flags_array[i]); 1040 } 1041 } 1042 } 1043 1044 void Arguments::print_jvm_args_on(outputStream* st) { 1045 if (_num_jvm_args > 0) { 1046 for (int i=0; i < _num_jvm_args; i++) { 1047 st->print("%s ", _jvm_args_array[i]); 1048 } 1049 } 1050 } 1051 1052 bool Arguments::process_argument(const char* arg, 1053 jboolean ignore_unrecognized, 1054 Flag::Flags origin) { 1055 JDK_Version since = JDK_Version(); 1056 1057 if (parse_argument(arg, origin)) { 1058 return true; 1059 } 1060 1061 // Determine if the flag has '+', '-', or '=' characters. 1062 bool has_plus_minus = (*arg == '+' || *arg == '-'); 1063 const char* const argname = has_plus_minus ? arg + 1 : arg; 1064 1065 size_t arg_len; 1066 const char* equal_sign = strchr(argname, '='); 1067 if (equal_sign == NULL) { 1068 arg_len = strlen(argname); 1069 } else { 1070 arg_len = equal_sign - argname; 1071 } 1072 1073 // Only make the obsolete check for valid arguments. 1074 if (arg_len <= BUFLEN) { 1075 // Construct a string which consists only of the argument name without '+', '-', or '='. 1076 char stripped_argname[BUFLEN+1]; // +1 for '\0' 1077 jio_snprintf(stripped_argname, arg_len+1, "%s", argname); // +1 for '\0' 1078 if (is_obsolete_flag(stripped_argname, &since)) { 1079 char version[256]; 1080 since.to_string(version, sizeof(version)); 1081 warning("Ignoring option %s; support was removed in %s", stripped_argname, version); 1082 return true; 1083 } 1084 #ifndef PRODUCT 1085 else { 1086 const char* replacement; 1087 if ((replacement = removed_develop_logging_flag_name(stripped_argname)) != NULL){ 1088 log_warning(arguments)("%s has been removed. Please use %s instead.", 1089 stripped_argname, 1090 replacement); 1091 return false; 1092 } 1093 } 1094 #endif //PRODUCT 1095 } 1096 1097 // For locked flags, report a custom error message if available. 1098 // Otherwise, report the standard unrecognized VM option. 1099 Flag* found_flag = Flag::find_flag((const char*)argname, arg_len, true, true); 1100 if (found_flag != NULL) { 1101 char locked_message_buf[BUFLEN]; 1102 Flag::MsgType msg_type = found_flag->get_locked_message(locked_message_buf, BUFLEN); 1103 if (strlen(locked_message_buf) == 0) { 1104 if (found_flag->is_bool() && !has_plus_minus) { 1105 jio_fprintf(defaultStream::error_stream(), 1106 "Missing +/- setting for VM option '%s'\n", argname); 1107 } else if (!found_flag->is_bool() && has_plus_minus) { 1108 jio_fprintf(defaultStream::error_stream(), 1109 "Unexpected +/- setting in VM option '%s'\n", argname); 1110 } else { 1111 jio_fprintf(defaultStream::error_stream(), 1112 "Improperly specified VM option '%s'\n", argname); 1113 } 1114 } else { 1115 #ifdef PRODUCT 1116 bool mismatched = ((msg_type == Flag::NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD) || 1117 (msg_type == Flag::DEVELOPER_FLAG_BUT_PRODUCT_BUILD)); 1118 if (ignore_unrecognized && mismatched) { 1119 return true; 1120 } 1121 #endif 1122 jio_fprintf(defaultStream::error_stream(), "%s", locked_message_buf); 1123 } 1124 } else { 1125 if (ignore_unrecognized) { 1126 return true; 1127 } 1128 jio_fprintf(defaultStream::error_stream(), 1129 "Unrecognized VM option '%s'\n", argname); 1130 Flag* fuzzy_matched = Flag::fuzzy_match((const char*)argname, arg_len, true); 1131 if (fuzzy_matched != NULL) { 1132 jio_fprintf(defaultStream::error_stream(), 1133 "Did you mean '%s%s%s'? ", 1134 (fuzzy_matched->is_bool()) ? "(+/-)" : "", 1135 fuzzy_matched->_name, 1136 (fuzzy_matched->is_bool()) ? "" : "=<value>"); 1137 } 1138 } 1139 1140 // allow for commandline "commenting out" options like -XX:#+Verbose 1141 return arg[0] == '#'; 1142 } 1143 1144 bool Arguments::process_settings_file(const char* file_name, bool should_exist, jboolean ignore_unrecognized) { 1145 FILE* stream = fopen(file_name, "rb"); 1146 if (stream == NULL) { 1147 if (should_exist) { 1148 jio_fprintf(defaultStream::error_stream(), 1149 "Could not open settings file %s\n", file_name); 1150 return false; 1151 } else { 1152 return true; 1153 } 1154 } 1155 1156 char token[1024]; 1157 int pos = 0; 1158 1159 bool in_white_space = true; 1160 bool in_comment = false; 1161 bool in_quote = false; 1162 char quote_c = 0; 1163 bool result = true; 1164 1165 int c = getc(stream); 1166 while(c != EOF && pos < (int)(sizeof(token)-1)) { 1167 if (in_white_space) { 1168 if (in_comment) { 1169 if (c == '\n') in_comment = false; 1170 } else { 1171 if (c == '#') in_comment = true; 1172 else if (!isspace(c)) { 1173 in_white_space = false; 1174 token[pos++] = c; 1175 } 1176 } 1177 } else { 1178 if (c == '\n' || (!in_quote && isspace(c))) { 1179 // token ends at newline, or at unquoted whitespace 1180 // this allows a way to include spaces in string-valued options 1181 token[pos] = '\0'; 1182 logOption(token); 1183 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1184 build_jvm_flags(token); 1185 pos = 0; 1186 in_white_space = true; 1187 in_quote = false; 1188 } else if (!in_quote && (c == '\'' || c == '"')) { 1189 in_quote = true; 1190 quote_c = c; 1191 } else if (in_quote && (c == quote_c)) { 1192 in_quote = false; 1193 } else { 1194 token[pos++] = c; 1195 } 1196 } 1197 c = getc(stream); 1198 } 1199 if (pos > 0) { 1200 token[pos] = '\0'; 1201 result &= process_argument(token, ignore_unrecognized, Flag::CONFIG_FILE); 1202 build_jvm_flags(token); 1203 } 1204 fclose(stream); 1205 return result; 1206 } 1207 1208 //============================================================================================================= 1209 // Parsing of properties (-D) 1210 1211 const char* Arguments::get_property(const char* key) { 1212 return PropertyList_get_value(system_properties(), key); 1213 } 1214 1215 bool Arguments::add_property(const char* prop, PropertyWriteable writeable, PropertyInternal internal) { 1216 const char* eq = strchr(prop, '='); 1217 const char* key; 1218 const char* value = ""; 1219 1220 if (eq == NULL) { 1221 // property doesn't have a value, thus use passed string 1222 key = prop; 1223 } else { 1224 // property have a value, thus extract it and save to the 1225 // allocated string 1226 size_t key_len = eq - prop; 1227 char* tmp_key = AllocateHeap(key_len + 1, mtArguments); 1228 1229 jio_snprintf(tmp_key, key_len + 1, "%s", prop); 1230 key = tmp_key; 1231 1232 value = &prop[key_len + 1]; 1233 } 1234 1235 if (strcmp(key, "java.compiler") == 0) { 1236 process_java_compiler_argument(value); 1237 // Record value in Arguments, but let it get passed to Java. 1238 } else if (strcmp(key, "sun.java.launcher.is_altjvm") == 0 || 1239 strcmp(key, "sun.java.launcher.pid") == 0) { 1240 // sun.java.launcher.is_altjvm and sun.java.launcher.pid property are 1241 // private and are processed in process_sun_java_launcher_properties(); 1242 // the sun.java.launcher property is passed on to the java application 1243 } else if (strcmp(key, "sun.boot.library.path") == 0) { 1244 // append is true, writable is true, internal is false 1245 PropertyList_unique_add(&_system_properties, key, value, AppendProperty, 1246 WriteableProperty, ExternalProperty); 1247 } else { 1248 if (strcmp(key, "sun.java.command") == 0) { 1249 char *old_java_command = _java_command; 1250 _java_command = os::strdup_check_oom(value, mtArguments); 1251 if (old_java_command != NULL) { 1252 os::free(old_java_command); 1253 } 1254 } else if (strcmp(key, "java.vendor.url.bug") == 0) { 1255 const char* old_java_vendor_url_bug = _java_vendor_url_bug; 1256 // save it in _java_vendor_url_bug, so JVM fatal error handler can access 1257 // its value without going through the property list or making a Java call. 1258 _java_vendor_url_bug = os::strdup_check_oom(value, mtArguments); 1259 if (old_java_vendor_url_bug != DEFAULT_VENDOR_URL_BUG) { 1260 assert(old_java_vendor_url_bug != NULL, "_java_vendor_url_bug is NULL"); 1261 os::free((void *)old_java_vendor_url_bug); 1262 } 1263 } 1264 1265 // Create new property and add at the end of the list 1266 PropertyList_unique_add(&_system_properties, key, value, AddProperty, writeable, internal); 1267 } 1268 1269 if (key != prop) { 1270 // SystemProperty copy passed value, thus free previously allocated 1271 // memory 1272 FreeHeap((void *)key); 1273 } 1274 1275 return true; 1276 } 1277 1278 #if INCLUDE_CDS 1279 void Arguments::check_unsupported_dumping_properties() { 1280 assert(DumpSharedSpaces, "this function is only used with -Xshare:dump"); 1281 const char* unsupported_properties[] = { "jdk.module.main", 1282 "jdk.module.limitmods", 1283 "jdk.module.path", 1284 "jdk.module.upgrade.path", 1285 "jdk.module.addmods.0", 1286 "jdk.module.patch.0" }; 1287 const char* unsupported_options[] = { "-m", // cannot use at dump time 1288 "--limit-modules", // ignored at dump time 1289 "--module-path", // ignored at dump time 1290 "--upgrade-module-path", // ignored at dump time 1291 "--add-modules", // ignored at dump time 1292 "--patch-module" // ignored at dump time 1293 }; 1294 assert(ARRAY_SIZE(unsupported_properties) == ARRAY_SIZE(unsupported_options), "must be"); 1295 // If a vm option is found in the unsupported_options array with index less than the info_idx, 1296 // vm will exit with an error message. Otherwise, it will print an informational message if 1297 // PrintSharedSpaces is enabled. 1298 uint info_idx = 1; 1299 SystemProperty* sp = system_properties(); 1300 while (sp != NULL) { 1301 for (uint i = 0; i < ARRAY_SIZE(unsupported_properties); i++) { 1302 if (strcmp(sp->key(), unsupported_properties[i]) == 0) { 1303 if (i < info_idx) { 1304 vm_exit_during_initialization( 1305 "Cannot use the following option when dumping the shared archive", unsupported_options[i]); 1306 } else { 1307 if (PrintSharedSpaces) { 1308 tty->print_cr( 1309 "Info: the %s option is ignored when dumping the shared archive", unsupported_options[i]); 1310 } 1311 } 1312 } 1313 } 1314 sp = sp->next(); 1315 } 1316 1317 // Check for an exploded module build in use with -Xshare:dump. 1318 if (!has_jimage()) { 1319 vm_exit_during_initialization("Dumping the shared archive is not supported with an exploded module build"); 1320 } 1321 } 1322 #endif 1323 1324 //=========================================================================================================== 1325 // Setting int/mixed/comp mode flags 1326 1327 void Arguments::set_mode_flags(Mode mode) { 1328 // Set up default values for all flags. 1329 // If you add a flag to any of the branches below, 1330 // add a default value for it here. 1331 set_java_compiler(false); 1332 _mode = mode; 1333 1334 // Ensure Agent_OnLoad has the correct initial values. 1335 // This may not be the final mode; mode may change later in onload phase. 1336 PropertyList_unique_add(&_system_properties, "java.vm.info", 1337 VM_Version::vm_info_string(), AddProperty, UnwriteableProperty, ExternalProperty); 1338 1339 UseInterpreter = true; 1340 UseCompiler = true; 1341 UseLoopCounter = true; 1342 1343 // Default values may be platform/compiler dependent - 1344 // use the saved values 1345 ClipInlining = Arguments::_ClipInlining; 1346 AlwaysCompileLoopMethods = Arguments::_AlwaysCompileLoopMethods; 1347 UseOnStackReplacement = Arguments::_UseOnStackReplacement; 1348 BackgroundCompilation = Arguments::_BackgroundCompilation; 1349 if (TieredCompilation) { 1350 if (FLAG_IS_DEFAULT(Tier3InvokeNotifyFreqLog)) { 1351 Tier3InvokeNotifyFreqLog = Arguments::_Tier3InvokeNotifyFreqLog; 1352 } 1353 if (FLAG_IS_DEFAULT(Tier4InvocationThreshold)) { 1354 Tier4InvocationThreshold = Arguments::_Tier4InvocationThreshold; 1355 } 1356 } 1357 1358 // Change from defaults based on mode 1359 switch (mode) { 1360 default: 1361 ShouldNotReachHere(); 1362 break; 1363 case _int: 1364 UseCompiler = false; 1365 UseLoopCounter = false; 1366 AlwaysCompileLoopMethods = false; 1367 UseOnStackReplacement = false; 1368 break; 1369 case _mixed: 1370 // same as default 1371 break; 1372 case _comp: 1373 UseInterpreter = false; 1374 BackgroundCompilation = false; 1375 ClipInlining = false; 1376 // Be much more aggressive in tiered mode with -Xcomp and exercise C2 more. 1377 // We will first compile a level 3 version (C1 with full profiling), then do one invocation of it and 1378 // compile a level 4 (C2) and then continue executing it. 1379 if (TieredCompilation) { 1380 Tier3InvokeNotifyFreqLog = 0; 1381 Tier4InvocationThreshold = 0; 1382 } 1383 break; 1384 } 1385 } 1386 1387 // Conflict: required to use shared spaces (-Xshare:on), but 1388 // incompatible command line options were chosen. 1389 static void no_shared_spaces(const char* message) { 1390 if (RequireSharedSpaces) { 1391 jio_fprintf(defaultStream::error_stream(), 1392 "Class data sharing is inconsistent with other specified options.\n"); 1393 vm_exit_during_initialization("Unable to use shared archive.", message); 1394 } else { 1395 FLAG_SET_DEFAULT(UseSharedSpaces, false); 1396 } 1397 } 1398 1399 // Returns threshold scaled with the value of scale. 1400 // If scale < 0.0, threshold is returned without scaling. 1401 intx Arguments::scaled_compile_threshold(intx threshold, double scale) { 1402 if (scale == 1.0 || scale < 0.0) { 1403 return threshold; 1404 } else { 1405 return (intx)(threshold * scale); 1406 } 1407 } 1408 1409 // Returns freq_log scaled with the value of scale. 1410 // Returned values are in the range of [0, InvocationCounter::number_of_count_bits + 1]. 1411 // If scale < 0.0, freq_log is returned without scaling. 1412 intx Arguments::scaled_freq_log(intx freq_log, double scale) { 1413 // Check if scaling is necessary or if negative value was specified. 1414 if (scale == 1.0 || scale < 0.0) { 1415 return freq_log; 1416 } 1417 // Check values to avoid calculating log2 of 0. 1418 if (scale == 0.0 || freq_log == 0) { 1419 return 0; 1420 } 1421 // Determine the maximum notification frequency value currently supported. 1422 // The largest mask value that the interpreter/C1 can handle is 1423 // of length InvocationCounter::number_of_count_bits. Mask values are always 1424 // one bit shorter then the value of the notification frequency. Set 1425 // max_freq_bits accordingly. 1426 intx max_freq_bits = InvocationCounter::number_of_count_bits + 1; 1427 intx scaled_freq = scaled_compile_threshold((intx)1 << freq_log, scale); 1428 if (scaled_freq == 0) { 1429 // Return 0 right away to avoid calculating log2 of 0. 1430 return 0; 1431 } else if (scaled_freq > nth_bit(max_freq_bits)) { 1432 return max_freq_bits; 1433 } else { 1434 return log2_intptr(scaled_freq); 1435 } 1436 } 1437 1438 void Arguments::set_tiered_flags() { 1439 // With tiered, set default policy to AdvancedThresholdPolicy, which is 3. 1440 if (FLAG_IS_DEFAULT(CompilationPolicyChoice)) { 1441 FLAG_SET_DEFAULT(CompilationPolicyChoice, 3); 1442 } 1443 if (CompilationPolicyChoice < 2) { 1444 vm_exit_during_initialization( 1445 "Incompatible compilation policy selected", NULL); 1446 } 1447 // Increase the code cache size - tiered compiles a lot more. 1448 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1449 FLAG_SET_ERGO(uintx, ReservedCodeCacheSize, 1450 MIN2(CODE_CACHE_DEFAULT_LIMIT, ReservedCodeCacheSize * 5)); 1451 } 1452 // Enable SegmentedCodeCache if TieredCompilation is enabled and ReservedCodeCacheSize >= 240M 1453 if (FLAG_IS_DEFAULT(SegmentedCodeCache) && ReservedCodeCacheSize >= 240*M) { 1454 FLAG_SET_ERGO(bool, SegmentedCodeCache, true); 1455 } 1456 if (!UseInterpreter) { // -Xcomp 1457 Tier3InvokeNotifyFreqLog = 0; 1458 Tier4InvocationThreshold = 0; 1459 } 1460 1461 if (CompileThresholdScaling < 0) { 1462 vm_exit_during_initialization("Negative value specified for CompileThresholdScaling", NULL); 1463 } 1464 1465 // Scale tiered compilation thresholds. 1466 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves compilation thresholds unchanged. 1467 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 1468 FLAG_SET_ERGO(intx, Tier0InvokeNotifyFreqLog, scaled_freq_log(Tier0InvokeNotifyFreqLog)); 1469 FLAG_SET_ERGO(intx, Tier0BackedgeNotifyFreqLog, scaled_freq_log(Tier0BackedgeNotifyFreqLog)); 1470 1471 FLAG_SET_ERGO(intx, Tier3InvocationThreshold, scaled_compile_threshold(Tier3InvocationThreshold)); 1472 FLAG_SET_ERGO(intx, Tier3MinInvocationThreshold, scaled_compile_threshold(Tier3MinInvocationThreshold)); 1473 FLAG_SET_ERGO(intx, Tier3CompileThreshold, scaled_compile_threshold(Tier3CompileThreshold)); 1474 FLAG_SET_ERGO(intx, Tier3BackEdgeThreshold, scaled_compile_threshold(Tier3BackEdgeThreshold)); 1475 1476 // Tier2{Invocation,MinInvocation,Compile,Backedge}Threshold should be scaled here 1477 // once these thresholds become supported. 1478 1479 FLAG_SET_ERGO(intx, Tier2InvokeNotifyFreqLog, scaled_freq_log(Tier2InvokeNotifyFreqLog)); 1480 FLAG_SET_ERGO(intx, Tier2BackedgeNotifyFreqLog, scaled_freq_log(Tier2BackedgeNotifyFreqLog)); 1481 1482 FLAG_SET_ERGO(intx, Tier3InvokeNotifyFreqLog, scaled_freq_log(Tier3InvokeNotifyFreqLog)); 1483 FLAG_SET_ERGO(intx, Tier3BackedgeNotifyFreqLog, scaled_freq_log(Tier3BackedgeNotifyFreqLog)); 1484 1485 FLAG_SET_ERGO(intx, Tier23InlineeNotifyFreqLog, scaled_freq_log(Tier23InlineeNotifyFreqLog)); 1486 1487 FLAG_SET_ERGO(intx, Tier4InvocationThreshold, scaled_compile_threshold(Tier4InvocationThreshold)); 1488 FLAG_SET_ERGO(intx, Tier4MinInvocationThreshold, scaled_compile_threshold(Tier4MinInvocationThreshold)); 1489 FLAG_SET_ERGO(intx, Tier4CompileThreshold, scaled_compile_threshold(Tier4CompileThreshold)); 1490 FLAG_SET_ERGO(intx, Tier4BackEdgeThreshold, scaled_compile_threshold(Tier4BackEdgeThreshold)); 1491 } 1492 } 1493 1494 #if INCLUDE_ALL_GCS 1495 static void disable_adaptive_size_policy(const char* collector_name) { 1496 if (UseAdaptiveSizePolicy) { 1497 if (FLAG_IS_CMDLINE(UseAdaptiveSizePolicy)) { 1498 warning("Disabling UseAdaptiveSizePolicy; it is incompatible with %s.", 1499 collector_name); 1500 } 1501 FLAG_SET_DEFAULT(UseAdaptiveSizePolicy, false); 1502 } 1503 } 1504 1505 void Arguments::set_parnew_gc_flags() { 1506 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC && !UseG1GC, 1507 "control point invariant"); 1508 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1509 1510 if (FLAG_IS_DEFAULT(ParallelGCThreads)) { 1511 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1512 assert(ParallelGCThreads > 0, "We should always have at least one thread by default"); 1513 } else if (ParallelGCThreads == 0) { 1514 jio_fprintf(defaultStream::error_stream(), 1515 "The ParNew GC can not be combined with -XX:ParallelGCThreads=0\n"); 1516 vm_exit(1); 1517 } 1518 1519 // By default YoungPLABSize and OldPLABSize are set to 4096 and 1024 respectively, 1520 // these settings are default for Parallel Scavenger. For ParNew+Tenured configuration 1521 // we set them to 1024 and 1024. 1522 // See CR 6362902. 1523 if (FLAG_IS_DEFAULT(YoungPLABSize)) { 1524 FLAG_SET_DEFAULT(YoungPLABSize, (intx)1024); 1525 } 1526 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1527 FLAG_SET_DEFAULT(OldPLABSize, (intx)1024); 1528 } 1529 1530 // When using compressed oops, we use local overflow stacks, 1531 // rather than using a global overflow list chained through 1532 // the klass word of the object's pre-image. 1533 if (UseCompressedOops && !ParGCUseLocalOverflow) { 1534 if (!FLAG_IS_DEFAULT(ParGCUseLocalOverflow)) { 1535 warning("Forcing +ParGCUseLocalOverflow: needed if using compressed references"); 1536 } 1537 FLAG_SET_DEFAULT(ParGCUseLocalOverflow, true); 1538 } 1539 assert(ParGCUseLocalOverflow || !UseCompressedOops, "Error"); 1540 } 1541 1542 // Adjust some sizes to suit CMS and/or ParNew needs; these work well on 1543 // sparc/solaris for certain applications, but would gain from 1544 // further optimization and tuning efforts, and would almost 1545 // certainly gain from analysis of platform and environment. 1546 void Arguments::set_cms_and_parnew_gc_flags() { 1547 assert(!UseSerialGC && !UseParallelOldGC && !UseParallelGC, "Error"); 1548 assert(UseConcMarkSweepGC, "CMS is expected to be on here"); 1549 1550 // Turn off AdaptiveSizePolicy by default for cms until it is complete. 1551 disable_adaptive_size_policy("UseConcMarkSweepGC"); 1552 1553 set_parnew_gc_flags(); 1554 1555 size_t max_heap = align_size_down(MaxHeapSize, 1556 CardTableRS::ct_max_alignment_constraint()); 1557 1558 // Now make adjustments for CMS 1559 intx tenuring_default = (intx)6; 1560 size_t young_gen_per_worker = CMSYoungGenPerWorker; 1561 1562 // Preferred young gen size for "short" pauses: 1563 // upper bound depends on # of threads and NewRatio. 1564 const size_t preferred_max_new_size_unaligned = 1565 MIN2(max_heap/(NewRatio+1), ScaleForWordSize(young_gen_per_worker * ParallelGCThreads)); 1566 size_t preferred_max_new_size = 1567 align_size_up(preferred_max_new_size_unaligned, os::vm_page_size()); 1568 1569 // Unless explicitly requested otherwise, size young gen 1570 // for "short" pauses ~ CMSYoungGenPerWorker*ParallelGCThreads 1571 1572 // If either MaxNewSize or NewRatio is set on the command line, 1573 // assume the user is trying to set the size of the young gen. 1574 if (FLAG_IS_DEFAULT(MaxNewSize) && FLAG_IS_DEFAULT(NewRatio)) { 1575 1576 // Set MaxNewSize to our calculated preferred_max_new_size unless 1577 // NewSize was set on the command line and it is larger than 1578 // preferred_max_new_size. 1579 if (!FLAG_IS_DEFAULT(NewSize)) { // NewSize explicitly set at command-line 1580 FLAG_SET_ERGO(size_t, MaxNewSize, MAX2(NewSize, preferred_max_new_size)); 1581 } else { 1582 FLAG_SET_ERGO(size_t, MaxNewSize, preferred_max_new_size); 1583 } 1584 log_trace(gc, heap)("CMS ergo set MaxNewSize: " SIZE_FORMAT, MaxNewSize); 1585 1586 // Code along this path potentially sets NewSize and OldSize 1587 log_trace(gc, heap)("CMS set min_heap_size: " SIZE_FORMAT " initial_heap_size: " SIZE_FORMAT " max_heap: " SIZE_FORMAT, 1588 min_heap_size(), InitialHeapSize, max_heap); 1589 size_t min_new = preferred_max_new_size; 1590 if (FLAG_IS_CMDLINE(NewSize)) { 1591 min_new = NewSize; 1592 } 1593 if (max_heap > min_new && min_heap_size() > min_new) { 1594 // Unless explicitly requested otherwise, make young gen 1595 // at least min_new, and at most preferred_max_new_size. 1596 if (FLAG_IS_DEFAULT(NewSize)) { 1597 FLAG_SET_ERGO(size_t, NewSize, MAX2(NewSize, min_new)); 1598 FLAG_SET_ERGO(size_t, NewSize, MIN2(preferred_max_new_size, NewSize)); 1599 log_trace(gc, heap)("CMS ergo set NewSize: " SIZE_FORMAT, NewSize); 1600 } 1601 // Unless explicitly requested otherwise, size old gen 1602 // so it's NewRatio x of NewSize. 1603 if (FLAG_IS_DEFAULT(OldSize)) { 1604 if (max_heap > NewSize) { 1605 FLAG_SET_ERGO(size_t, OldSize, MIN2(NewRatio*NewSize, max_heap - NewSize)); 1606 log_trace(gc, heap)("CMS ergo set OldSize: " SIZE_FORMAT, OldSize); 1607 } 1608 } 1609 } 1610 } 1611 // Unless explicitly requested otherwise, definitely 1612 // promote all objects surviving "tenuring_default" scavenges. 1613 if (FLAG_IS_DEFAULT(MaxTenuringThreshold) && 1614 FLAG_IS_DEFAULT(SurvivorRatio)) { 1615 FLAG_SET_ERGO(uintx, MaxTenuringThreshold, tenuring_default); 1616 } 1617 // If we decided above (or user explicitly requested) 1618 // `promote all' (via MaxTenuringThreshold := 0), 1619 // prefer minuscule survivor spaces so as not to waste 1620 // space for (non-existent) survivors 1621 if (FLAG_IS_DEFAULT(SurvivorRatio) && MaxTenuringThreshold == 0) { 1622 FLAG_SET_ERGO(uintx, SurvivorRatio, MAX2((uintx)1024, SurvivorRatio)); 1623 } 1624 1625 // OldPLABSize is interpreted in CMS as not the size of the PLAB in words, 1626 // but rather the number of free blocks of a given size that are used when 1627 // replenishing the local per-worker free list caches. 1628 if (FLAG_IS_DEFAULT(OldPLABSize)) { 1629 if (!FLAG_IS_DEFAULT(ResizeOldPLAB) && !ResizeOldPLAB) { 1630 // OldPLAB sizing manually turned off: Use a larger default setting, 1631 // unless it was manually specified. This is because a too-low value 1632 // will slow down scavenges. 1633 FLAG_SET_ERGO(size_t, OldPLABSize, CompactibleFreeListSpaceLAB::_default_static_old_plab_size); // default value before 6631166 1634 } else { 1635 FLAG_SET_DEFAULT(OldPLABSize, CompactibleFreeListSpaceLAB::_default_dynamic_old_plab_size); // old CMSParPromoteBlocksToClaim default 1636 } 1637 } 1638 1639 // If either of the static initialization defaults have changed, note this 1640 // modification. 1641 if (!FLAG_IS_DEFAULT(OldPLABSize) || !FLAG_IS_DEFAULT(OldPLABWeight)) { 1642 CompactibleFreeListSpaceLAB::modify_initialization(OldPLABSize, OldPLABWeight); 1643 } 1644 1645 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1646 } 1647 #endif // INCLUDE_ALL_GCS 1648 1649 void set_object_alignment() { 1650 // Object alignment. 1651 assert(is_power_of_2(ObjectAlignmentInBytes), "ObjectAlignmentInBytes must be power of 2"); 1652 MinObjAlignmentInBytes = ObjectAlignmentInBytes; 1653 assert(MinObjAlignmentInBytes >= HeapWordsPerLong * HeapWordSize, "ObjectAlignmentInBytes value is too small"); 1654 MinObjAlignment = MinObjAlignmentInBytes / HeapWordSize; 1655 assert(MinObjAlignmentInBytes == MinObjAlignment * HeapWordSize, "ObjectAlignmentInBytes value is incorrect"); 1656 MinObjAlignmentInBytesMask = MinObjAlignmentInBytes - 1; 1657 1658 LogMinObjAlignmentInBytes = exact_log2(ObjectAlignmentInBytes); 1659 LogMinObjAlignment = LogMinObjAlignmentInBytes - LogHeapWordSize; 1660 1661 // Oop encoding heap max 1662 OopEncodingHeapMax = (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; 1663 1664 if (SurvivorAlignmentInBytes == 0) { 1665 SurvivorAlignmentInBytes = ObjectAlignmentInBytes; 1666 } 1667 1668 #if INCLUDE_ALL_GCS 1669 // Set CMS global values 1670 CompactibleFreeListSpace::set_cms_values(); 1671 #endif // INCLUDE_ALL_GCS 1672 } 1673 1674 size_t Arguments::max_heap_for_compressed_oops() { 1675 // Avoid sign flip. 1676 assert(OopEncodingHeapMax > (uint64_t)os::vm_page_size(), "Unusual page size"); 1677 // We need to fit both the NULL page and the heap into the memory budget, while 1678 // keeping alignment constraints of the heap. To guarantee the latter, as the 1679 // NULL page is located before the heap, we pad the NULL page to the conservative 1680 // maximum alignment that the GC may ever impose upon the heap. 1681 size_t displacement_due_to_null_page = align_size_up_(os::vm_page_size(), 1682 _conservative_max_heap_alignment); 1683 1684 LP64_ONLY(return OopEncodingHeapMax - displacement_due_to_null_page); 1685 NOT_LP64(ShouldNotReachHere(); return 0); 1686 } 1687 1688 void Arguments::set_use_compressed_oops() { 1689 #ifndef ZERO 1690 #ifdef _LP64 1691 // MaxHeapSize is not set up properly at this point, but 1692 // the only value that can override MaxHeapSize if we are 1693 // to use UseCompressedOops is InitialHeapSize. 1694 size_t max_heap_size = MAX2(MaxHeapSize, InitialHeapSize); 1695 1696 if (max_heap_size <= max_heap_for_compressed_oops()) { 1697 #if !defined(COMPILER1) || defined(TIERED) 1698 if (FLAG_IS_DEFAULT(UseCompressedOops)) { 1699 FLAG_SET_ERGO(bool, UseCompressedOops, true); 1700 } 1701 #endif 1702 } else { 1703 if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) { 1704 warning("Max heap size too large for Compressed Oops"); 1705 FLAG_SET_DEFAULT(UseCompressedOops, false); 1706 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1707 } 1708 } 1709 #endif // _LP64 1710 #endif // ZERO 1711 } 1712 1713 1714 // NOTE: set_use_compressed_klass_ptrs() must be called after calling 1715 // set_use_compressed_oops(). 1716 void Arguments::set_use_compressed_klass_ptrs() { 1717 #ifndef ZERO 1718 #ifdef _LP64 1719 // UseCompressedOops must be on for UseCompressedClassPointers to be on. 1720 if (!UseCompressedOops) { 1721 if (UseCompressedClassPointers) { 1722 warning("UseCompressedClassPointers requires UseCompressedOops"); 1723 } 1724 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1725 } else { 1726 // Turn on UseCompressedClassPointers too 1727 if (FLAG_IS_DEFAULT(UseCompressedClassPointers)) { 1728 FLAG_SET_ERGO(bool, UseCompressedClassPointers, true); 1729 } 1730 // Check the CompressedClassSpaceSize to make sure we use compressed klass ptrs. 1731 if (UseCompressedClassPointers) { 1732 if (CompressedClassSpaceSize > KlassEncodingMetaspaceMax) { 1733 warning("CompressedClassSpaceSize is too large for UseCompressedClassPointers"); 1734 FLAG_SET_DEFAULT(UseCompressedClassPointers, false); 1735 } 1736 } 1737 } 1738 #endif // _LP64 1739 #endif // !ZERO 1740 } 1741 1742 void Arguments::set_conservative_max_heap_alignment() { 1743 // The conservative maximum required alignment for the heap is the maximum of 1744 // the alignments imposed by several sources: any requirements from the heap 1745 // itself, the collector policy and the maximum page size we may run the VM 1746 // with. 1747 size_t heap_alignment = GenCollectedHeap::conservative_max_heap_alignment(); 1748 #if INCLUDE_ALL_GCS 1749 if (UseParallelGC) { 1750 heap_alignment = ParallelScavengeHeap::conservative_max_heap_alignment(); 1751 } else if (UseG1GC) { 1752 heap_alignment = G1CollectedHeap::conservative_max_heap_alignment(); 1753 } 1754 #endif // INCLUDE_ALL_GCS 1755 _conservative_max_heap_alignment = MAX4(heap_alignment, 1756 (size_t)os::vm_allocation_granularity(), 1757 os::max_page_size(), 1758 CollectorPolicy::compute_heap_alignment()); 1759 } 1760 1761 bool Arguments::gc_selected() { 1762 #if INCLUDE_ALL_GCS 1763 return UseSerialGC || UseParallelGC || UseParallelOldGC || UseConcMarkSweepGC || UseG1GC; 1764 #else 1765 return UseSerialGC; 1766 #endif // INCLUDE_ALL_GCS 1767 } 1768 1769 #ifdef TIERED 1770 bool Arguments::compilation_mode_selected() { 1771 return !FLAG_IS_DEFAULT(TieredCompilation) || !FLAG_IS_DEFAULT(TieredStopAtLevel) || 1772 !FLAG_IS_DEFAULT(UseAOT) JVMCI_ONLY(|| !FLAG_IS_DEFAULT(EnableJVMCI) || !FLAG_IS_DEFAULT(UseJVMCICompiler)); 1773 1774 } 1775 1776 void Arguments::select_compilation_mode_ergonomically() { 1777 #if defined(_WINDOWS) && !defined(_LP64) 1778 if (FLAG_IS_DEFAULT(NeverActAsServerClassMachine)) { 1779 FLAG_SET_ERGO(bool, NeverActAsServerClassMachine, true); 1780 } 1781 #endif 1782 if (NeverActAsServerClassMachine) { 1783 set_client_compilation_mode(); 1784 } 1785 } 1786 #endif //TIERED 1787 1788 void Arguments::select_gc_ergonomically() { 1789 #if INCLUDE_ALL_GCS 1790 if (os::is_server_class_machine()) { 1791 FLAG_SET_ERGO_IF_DEFAULT(bool, UseG1GC, true); 1792 } else { 1793 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1794 } 1795 #else 1796 UNSUPPORTED_OPTION(UseG1GC); 1797 UNSUPPORTED_OPTION(UseParallelGC); 1798 UNSUPPORTED_OPTION(UseParallelOldGC); 1799 UNSUPPORTED_OPTION(UseConcMarkSweepGC); 1800 FLAG_SET_ERGO_IF_DEFAULT(bool, UseSerialGC, true); 1801 #endif // INCLUDE_ALL_GCS 1802 } 1803 1804 void Arguments::select_gc() { 1805 if (!gc_selected()) { 1806 select_gc_ergonomically(); 1807 if (!gc_selected()) { 1808 vm_exit_during_initialization("Garbage collector not selected (default collector explicitly disabled)", NULL); 1809 } 1810 } 1811 } 1812 1813 #if INCLUDE_JVMCI 1814 void Arguments::set_jvmci_specific_flags() { 1815 if (UseJVMCICompiler) { 1816 if (FLAG_IS_DEFAULT(TypeProfileWidth)) { 1817 FLAG_SET_DEFAULT(TypeProfileWidth, 8); 1818 } 1819 if (FLAG_IS_DEFAULT(OnStackReplacePercentage)) { 1820 FLAG_SET_DEFAULT(OnStackReplacePercentage, 933); 1821 } 1822 if (FLAG_IS_DEFAULT(ReservedCodeCacheSize)) { 1823 FLAG_SET_DEFAULT(ReservedCodeCacheSize, 64*M); 1824 } 1825 if (FLAG_IS_DEFAULT(InitialCodeCacheSize)) { 1826 FLAG_SET_DEFAULT(InitialCodeCacheSize, 16*M); 1827 } 1828 if (FLAG_IS_DEFAULT(MetaspaceSize)) { 1829 FLAG_SET_DEFAULT(MetaspaceSize, 12*M); 1830 } 1831 if (FLAG_IS_DEFAULT(NewSizeThreadIncrease)) { 1832 FLAG_SET_DEFAULT(NewSizeThreadIncrease, 4*K); 1833 } 1834 if (TieredStopAtLevel != CompLevel_full_optimization) { 1835 // Currently JVMCI compiler can only work at the full optimization level 1836 warning("forcing TieredStopAtLevel to full optimization because JVMCI is enabled"); 1837 TieredStopAtLevel = CompLevel_full_optimization; 1838 } 1839 if (FLAG_IS_DEFAULT(TypeProfileLevel)) { 1840 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 1841 } 1842 } 1843 } 1844 #endif 1845 1846 void Arguments::set_ergonomics_flags() { 1847 #ifdef TIERED 1848 if (!compilation_mode_selected()) { 1849 select_compilation_mode_ergonomically(); 1850 } 1851 #endif 1852 select_gc(); 1853 1854 #if defined(COMPILER2) || INCLUDE_JVMCI 1855 // Shared spaces work fine with other GCs but causes bytecode rewriting 1856 // to be disabled, which hurts interpreter performance and decreases 1857 // server performance. When -server is specified, keep the default off 1858 // unless it is asked for. Future work: either add bytecode rewriting 1859 // at link time, or rewrite bytecodes in non-shared methods. 1860 if (is_server_compilation_mode_vm() && !DumpSharedSpaces && !RequireSharedSpaces && 1861 (FLAG_IS_DEFAULT(UseSharedSpaces) || !UseSharedSpaces)) { 1862 no_shared_spaces("COMPILER2 default: -Xshare:auto | off, have to manually setup to on."); 1863 } 1864 #endif 1865 1866 set_conservative_max_heap_alignment(); 1867 1868 #ifndef ZERO 1869 #ifdef _LP64 1870 set_use_compressed_oops(); 1871 1872 // set_use_compressed_klass_ptrs() must be called after calling 1873 // set_use_compressed_oops(). 1874 set_use_compressed_klass_ptrs(); 1875 1876 // Also checks that certain machines are slower with compressed oops 1877 // in vm_version initialization code. 1878 #endif // _LP64 1879 #endif // !ZERO 1880 1881 } 1882 1883 void Arguments::set_parallel_gc_flags() { 1884 assert(UseParallelGC || UseParallelOldGC, "Error"); 1885 // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). 1886 if (FLAG_IS_DEFAULT(UseParallelOldGC)) { 1887 FLAG_SET_DEFAULT(UseParallelOldGC, true); 1888 } 1889 FLAG_SET_DEFAULT(UseParallelGC, true); 1890 1891 // If no heap maximum was requested explicitly, use some reasonable fraction 1892 // of the physical memory, up to a maximum of 1GB. 1893 FLAG_SET_DEFAULT(ParallelGCThreads, 1894 Abstract_VM_Version::parallel_worker_threads()); 1895 if (ParallelGCThreads == 0) { 1896 jio_fprintf(defaultStream::error_stream(), 1897 "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); 1898 vm_exit(1); 1899 } 1900 1901 if (UseAdaptiveSizePolicy) { 1902 // We don't want to limit adaptive heap sizing's freedom to adjust the heap 1903 // unless the user actually sets these flags. 1904 if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { 1905 FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); 1906 } 1907 if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { 1908 FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); 1909 } 1910 } 1911 1912 // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the 1913 // SurvivorRatio has been set, reset their default values to SurvivorRatio + 1914 // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. 1915 // See CR 6362902 for details. 1916 if (!FLAG_IS_DEFAULT(SurvivorRatio)) { 1917 if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { 1918 FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); 1919 } 1920 if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { 1921 FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); 1922 } 1923 } 1924 1925 if (UseParallelOldGC) { 1926 // Par compact uses lower default values since they are treated as 1927 // minimums. These are different defaults because of the different 1928 // interpretation and are not ergonomically set. 1929 if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { 1930 FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); 1931 } 1932 } 1933 } 1934 1935 void Arguments::set_g1_gc_flags() { 1936 assert(UseG1GC, "Error"); 1937 #if defined(COMPILER1) || INCLUDE_JVMCI 1938 FastTLABRefill = false; 1939 #endif 1940 FLAG_SET_DEFAULT(ParallelGCThreads, Abstract_VM_Version::parallel_worker_threads()); 1941 if (ParallelGCThreads == 0) { 1942 assert(!FLAG_IS_DEFAULT(ParallelGCThreads), "The default value for ParallelGCThreads should not be 0."); 1943 vm_exit_during_initialization("The flag -XX:+UseG1GC can not be combined with -XX:ParallelGCThreads=0", NULL); 1944 } 1945 1946 #if INCLUDE_ALL_GCS 1947 if (FLAG_IS_DEFAULT(G1ConcRefinementThreads)) { 1948 FLAG_SET_ERGO(uint, G1ConcRefinementThreads, ParallelGCThreads); 1949 } 1950 #endif 1951 1952 // MarkStackSize will be set (if it hasn't been set by the user) 1953 // when concurrent marking is initialized. 1954 // Its value will be based upon the number of parallel marking threads. 1955 // But we do set the maximum mark stack size here. 1956 if (FLAG_IS_DEFAULT(MarkStackSizeMax)) { 1957 FLAG_SET_DEFAULT(MarkStackSizeMax, 128 * TASKQUEUE_SIZE); 1958 } 1959 1960 if (FLAG_IS_DEFAULT(GCTimeRatio) || GCTimeRatio == 0) { 1961 // In G1, we want the default GC overhead goal to be higher than 1962 // it is for PS, or the heap might be expanded too aggressively. 1963 // We set it here to ~8%. 1964 FLAG_SET_DEFAULT(GCTimeRatio, 12); 1965 } 1966 1967 // Below, we might need to calculate the pause time interval based on 1968 // the pause target. When we do so we are going to give G1 maximum 1969 // flexibility and allow it to do pauses when it needs to. So, we'll 1970 // arrange that the pause interval to be pause time target + 1 to 1971 // ensure that a) the pause time target is maximized with respect to 1972 // the pause interval and b) we maintain the invariant that pause 1973 // time target < pause interval. If the user does not want this 1974 // maximum flexibility, they will have to set the pause interval 1975 // explicitly. 1976 1977 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { 1978 // The default pause time target in G1 is 200ms 1979 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); 1980 } 1981 1982 // Then, if the interval parameter was not set, set it according to 1983 // the pause time target (this will also deal with the case when the 1984 // pause time target is the default value). 1985 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { 1986 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); 1987 } 1988 1989 log_trace(gc)("MarkStackSize: %uk MarkStackSizeMax: %uk", (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K)); 1990 } 1991 1992 void Arguments::set_gc_specific_flags() { 1993 #if INCLUDE_ALL_GCS 1994 // Set per-collector flags 1995 if (UseParallelGC || UseParallelOldGC) { 1996 set_parallel_gc_flags(); 1997 } else if (UseConcMarkSweepGC) { 1998 set_cms_and_parnew_gc_flags(); 1999 } else if (UseG1GC) { 2000 set_g1_gc_flags(); 2001 } 2002 if (AssumeMP && !UseSerialGC) { 2003 if (FLAG_IS_DEFAULT(ParallelGCThreads) && ParallelGCThreads == 1) { 2004 warning("If the number of processors is expected to increase from one, then" 2005 " you should configure the number of parallel GC threads appropriately" 2006 " using -XX:ParallelGCThreads=N"); 2007 } 2008 } 2009 if (MinHeapFreeRatio == 100) { 2010 // Keeping the heap 100% free is hard ;-) so limit it to 99%. 2011 FLAG_SET_ERGO(uintx, MinHeapFreeRatio, 99); 2012 } 2013 2014 // If class unloading is disabled, also disable concurrent class unloading. 2015 if (!ClassUnloading) { 2016 FLAG_SET_CMDLINE(bool, CMSClassUnloadingEnabled, false); 2017 FLAG_SET_CMDLINE(bool, ClassUnloadingWithConcurrentMark, false); 2018 } 2019 #endif // INCLUDE_ALL_GCS 2020 } 2021 2022 julong Arguments::limit_by_allocatable_memory(julong limit) { 2023 julong max_allocatable; 2024 julong result = limit; 2025 if (os::has_allocatable_memory_limit(&max_allocatable)) { 2026 result = MIN2(result, max_allocatable / MaxVirtMemFraction); 2027 } 2028 return result; 2029 } 2030 2031 // Use static initialization to get the default before parsing 2032 static const size_t DefaultHeapBaseMinAddress = HeapBaseMinAddress; 2033 2034 void Arguments::set_heap_size() { 2035 julong phys_mem = 2036 FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM) 2037 : (julong)MaxRAM; 2038 2039 // Experimental support for CGroup memory limits 2040 if (UseCGroupMemoryLimitForHeap) { 2041 // This is a rough indicator that a CGroup limit may be in force 2042 // for this process 2043 const char* lim_file = "/sys/fs/cgroup/memory/memory.limit_in_bytes"; 2044 FILE *fp = fopen(lim_file, "r"); 2045 if (fp != NULL) { 2046 julong cgroup_max = 0; 2047 int ret = fscanf(fp, JULONG_FORMAT, &cgroup_max); 2048 if (ret == 1 && cgroup_max > 0) { 2049 // If unlimited, cgroup_max will be a very large, but unspecified 2050 // value, so use initial phys_mem as a limit 2051 log_info(gc, heap)("Setting phys_mem to the min of cgroup limit (" 2052 JULONG_FORMAT "MB) and initial phys_mem (" 2053 JULONG_FORMAT "MB)", cgroup_max/M, phys_mem/M); 2054 phys_mem = MIN2(cgroup_max, phys_mem); 2055 } else { 2056 warning("Unable to read/parse cgroup memory limit from %s: %s", 2057 lim_file, errno != 0 ? strerror(errno) : "unknown error"); 2058 } 2059 fclose(fp); 2060 } else { 2061 warning("Unable to open cgroup memory limit file %s (%s)", lim_file, strerror(errno)); 2062 } 2063 } 2064 2065 // If the maximum heap size has not been set with -Xmx, 2066 // then set it as fraction of the size of physical memory, 2067 // respecting the maximum and minimum sizes of the heap. 2068 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2069 julong reasonable_max = phys_mem / MaxRAMFraction; 2070 2071 if (phys_mem <= MaxHeapSize * MinRAMFraction) { 2072 // Small physical memory, so use a minimum fraction of it for the heap 2073 reasonable_max = phys_mem / MinRAMFraction; 2074 } else { 2075 // Not-small physical memory, so require a heap at least 2076 // as large as MaxHeapSize 2077 reasonable_max = MAX2(reasonable_max, (julong)MaxHeapSize); 2078 } 2079 if (!FLAG_IS_DEFAULT(ErgoHeapSizeLimit) && ErgoHeapSizeLimit != 0) { 2080 // Limit the heap size to ErgoHeapSizeLimit 2081 reasonable_max = MIN2(reasonable_max, (julong)ErgoHeapSizeLimit); 2082 } 2083 if (UseCompressedOops) { 2084 // Limit the heap size to the maximum possible when using compressed oops 2085 julong max_coop_heap = (julong)max_heap_for_compressed_oops(); 2086 2087 // HeapBaseMinAddress can be greater than default but not less than. 2088 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress)) { 2089 if (HeapBaseMinAddress < DefaultHeapBaseMinAddress) { 2090 // matches compressed oops printing flags 2091 log_debug(gc, heap, coops)("HeapBaseMinAddress must be at least " SIZE_FORMAT 2092 " (" SIZE_FORMAT "G) which is greater than value given " SIZE_FORMAT, 2093 DefaultHeapBaseMinAddress, 2094 DefaultHeapBaseMinAddress/G, 2095 HeapBaseMinAddress); 2096 FLAG_SET_ERGO(size_t, HeapBaseMinAddress, DefaultHeapBaseMinAddress); 2097 } 2098 } 2099 2100 if (HeapBaseMinAddress + MaxHeapSize < max_coop_heap) { 2101 // Heap should be above HeapBaseMinAddress to get zero based compressed oops 2102 // but it should be not less than default MaxHeapSize. 2103 max_coop_heap -= HeapBaseMinAddress; 2104 } 2105 reasonable_max = MIN2(reasonable_max, max_coop_heap); 2106 } 2107 reasonable_max = limit_by_allocatable_memory(reasonable_max); 2108 2109 if (!FLAG_IS_DEFAULT(InitialHeapSize)) { 2110 // An initial heap size was specified on the command line, 2111 // so be sure that the maximum size is consistent. Done 2112 // after call to limit_by_allocatable_memory because that 2113 // method might reduce the allocation size. 2114 reasonable_max = MAX2(reasonable_max, (julong)InitialHeapSize); 2115 } 2116 2117 log_trace(gc, heap)(" Maximum heap size " SIZE_FORMAT, (size_t) reasonable_max); 2118 FLAG_SET_ERGO(size_t, MaxHeapSize, (size_t)reasonable_max); 2119 } 2120 2121 // If the minimum or initial heap_size have not been set or requested to be set 2122 // ergonomically, set them accordingly. 2123 if (InitialHeapSize == 0 || min_heap_size() == 0) { 2124 julong reasonable_minimum = (julong)(OldSize + NewSize); 2125 2126 reasonable_minimum = MIN2(reasonable_minimum, (julong)MaxHeapSize); 2127 2128 reasonable_minimum = limit_by_allocatable_memory(reasonable_minimum); 2129 2130 if (InitialHeapSize == 0) { 2131 julong reasonable_initial = phys_mem / InitialRAMFraction; 2132 2133 reasonable_initial = MAX3(reasonable_initial, reasonable_minimum, (julong)min_heap_size()); 2134 reasonable_initial = MIN2(reasonable_initial, (julong)MaxHeapSize); 2135 2136 reasonable_initial = limit_by_allocatable_memory(reasonable_initial); 2137 2138 log_trace(gc, heap)(" Initial heap size " SIZE_FORMAT, (size_t)reasonable_initial); 2139 FLAG_SET_ERGO(size_t, InitialHeapSize, (size_t)reasonable_initial); 2140 } 2141 // If the minimum heap size has not been set (via -Xms), 2142 // synchronize with InitialHeapSize to avoid errors with the default value. 2143 if (min_heap_size() == 0) { 2144 set_min_heap_size(MIN2((size_t)reasonable_minimum, InitialHeapSize)); 2145 log_trace(gc, heap)(" Minimum heap size " SIZE_FORMAT, min_heap_size()); 2146 } 2147 } 2148 } 2149 2150 // This option inspects the machine and attempts to set various 2151 // parameters to be optimal for long-running, memory allocation 2152 // intensive jobs. It is intended for machines with large 2153 // amounts of cpu and memory. 2154 jint Arguments::set_aggressive_heap_flags() { 2155 // initHeapSize is needed since _initial_heap_size is 4 bytes on a 32 bit 2156 // VM, but we may not be able to represent the total physical memory 2157 // available (like having 8gb of memory on a box but using a 32bit VM). 2158 // Thus, we need to make sure we're using a julong for intermediate 2159 // calculations. 2160 julong initHeapSize; 2161 julong total_memory = os::physical_memory(); 2162 2163 if (total_memory < (julong) 256 * M) { 2164 jio_fprintf(defaultStream::error_stream(), 2165 "You need at least 256mb of memory to use -XX:+AggressiveHeap\n"); 2166 vm_exit(1); 2167 } 2168 2169 // The heap size is half of available memory, or (at most) 2170 // all of possible memory less 160mb (leaving room for the OS 2171 // when using ISM). This is the maximum; because adaptive sizing 2172 // is turned on below, the actual space used may be smaller. 2173 2174 initHeapSize = MIN2(total_memory / (julong) 2, 2175 total_memory - (julong) 160 * M); 2176 2177 initHeapSize = limit_by_allocatable_memory(initHeapSize); 2178 2179 if (FLAG_IS_DEFAULT(MaxHeapSize)) { 2180 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, initHeapSize) != Flag::SUCCESS) { 2181 return JNI_EINVAL; 2182 } 2183 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, initHeapSize) != Flag::SUCCESS) { 2184 return JNI_EINVAL; 2185 } 2186 // Currently the minimum size and the initial heap sizes are the same. 2187 set_min_heap_size(initHeapSize); 2188 } 2189 if (FLAG_IS_DEFAULT(NewSize)) { 2190 // Make the young generation 3/8ths of the total heap. 2191 if (FLAG_SET_CMDLINE(size_t, NewSize, 2192 ((julong) MaxHeapSize / (julong) 8) * (julong) 3) != Flag::SUCCESS) { 2193 return JNI_EINVAL; 2194 } 2195 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, NewSize) != Flag::SUCCESS) { 2196 return JNI_EINVAL; 2197 } 2198 } 2199 2200 #if !defined(_ALLBSD_SOURCE) && !defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 2201 FLAG_SET_DEFAULT(UseLargePages, true); 2202 #endif 2203 2204 // Increase some data structure sizes for efficiency 2205 if (FLAG_SET_CMDLINE(size_t, BaseFootPrintEstimate, MaxHeapSize) != Flag::SUCCESS) { 2206 return JNI_EINVAL; 2207 } 2208 if (FLAG_SET_CMDLINE(bool, ResizeTLAB, false) != Flag::SUCCESS) { 2209 return JNI_EINVAL; 2210 } 2211 if (FLAG_SET_CMDLINE(size_t, TLABSize, 256 * K) != Flag::SUCCESS) { 2212 return JNI_EINVAL; 2213 } 2214 2215 // See the OldPLABSize comment below, but replace 'after promotion' 2216 // with 'after copying'. YoungPLABSize is the size of the survivor 2217 // space per-gc-thread buffers. The default is 4kw. 2218 if (FLAG_SET_CMDLINE(size_t, YoungPLABSize, 256 * K) != Flag::SUCCESS) { // Note: this is in words 2219 return JNI_EINVAL; 2220 } 2221 2222 // OldPLABSize is the size of the buffers in the old gen that 2223 // UseParallelGC uses to promote live data that doesn't fit in the 2224 // survivor spaces. At any given time, there's one for each gc thread. 2225 // The default size is 1kw. These buffers are rarely used, since the 2226 // survivor spaces are usually big enough. For specjbb, however, there 2227 // are occasions when there's lots of live data in the young gen 2228 // and we end up promoting some of it. We don't have a definite 2229 // explanation for why bumping OldPLABSize helps, but the theory 2230 // is that a bigger PLAB results in retaining something like the 2231 // original allocation order after promotion, which improves mutator 2232 // locality. A minor effect may be that larger PLABs reduce the 2233 // number of PLAB allocation events during gc. The value of 8kw 2234 // was arrived at by experimenting with specjbb. 2235 if (FLAG_SET_CMDLINE(size_t, OldPLABSize, 8 * K) != Flag::SUCCESS) { // Note: this is in words 2236 return JNI_EINVAL; 2237 } 2238 2239 // Enable parallel GC and adaptive generation sizing 2240 if (FLAG_SET_CMDLINE(bool, UseParallelGC, true) != Flag::SUCCESS) { 2241 return JNI_EINVAL; 2242 } 2243 FLAG_SET_DEFAULT(ParallelGCThreads, 2244 Abstract_VM_Version::parallel_worker_threads()); 2245 2246 // Encourage steady state memory management 2247 if (FLAG_SET_CMDLINE(uintx, ThresholdTolerance, 100) != Flag::SUCCESS) { 2248 return JNI_EINVAL; 2249 } 2250 2251 // This appears to improve mutator locality 2252 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 2253 return JNI_EINVAL; 2254 } 2255 2256 // Get around early Solaris scheduling bug 2257 // (affinity vs other jobs on system) 2258 // but disallow DR and offlining (5008695). 2259 if (FLAG_SET_CMDLINE(bool, BindGCTaskThreadsToCPUs, true) != Flag::SUCCESS) { 2260 return JNI_EINVAL; 2261 } 2262 2263 return JNI_OK; 2264 } 2265 2266 // This must be called after ergonomics. 2267 void Arguments::set_bytecode_flags() { 2268 if (!RewriteBytecodes) { 2269 FLAG_SET_DEFAULT(RewriteFrequentPairs, false); 2270 } 2271 } 2272 2273 // Aggressive optimization flags -XX:+AggressiveOpts 2274 jint Arguments::set_aggressive_opts_flags() { 2275 #ifdef COMPILER2 2276 if (AggressiveUnboxing) { 2277 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2278 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2279 } else if (!EliminateAutoBox) { 2280 // warning("AggressiveUnboxing is disabled because EliminateAutoBox is disabled"); 2281 AggressiveUnboxing = false; 2282 } 2283 if (FLAG_IS_DEFAULT(DoEscapeAnalysis)) { 2284 FLAG_SET_DEFAULT(DoEscapeAnalysis, true); 2285 } else if (!DoEscapeAnalysis) { 2286 // warning("AggressiveUnboxing is disabled because DoEscapeAnalysis is disabled"); 2287 AggressiveUnboxing = false; 2288 } 2289 } 2290 if (AggressiveOpts || !FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2291 if (FLAG_IS_DEFAULT(EliminateAutoBox)) { 2292 FLAG_SET_DEFAULT(EliminateAutoBox, true); 2293 } 2294 if (FLAG_IS_DEFAULT(AutoBoxCacheMax)) { 2295 FLAG_SET_DEFAULT(AutoBoxCacheMax, 20000); 2296 } 2297 2298 // Feed the cache size setting into the JDK 2299 char buffer[1024]; 2300 jio_snprintf(buffer, 1024, "java.lang.Integer.IntegerCache.high=" INTX_FORMAT, AutoBoxCacheMax); 2301 if (!add_property(buffer)) { 2302 return JNI_ENOMEM; 2303 } 2304 } 2305 if (AggressiveOpts && FLAG_IS_DEFAULT(BiasedLockingStartupDelay)) { 2306 FLAG_SET_DEFAULT(BiasedLockingStartupDelay, 500); 2307 } 2308 #endif 2309 2310 if (AggressiveOpts) { 2311 // Sample flag setting code 2312 // if (FLAG_IS_DEFAULT(EliminateZeroing)) { 2313 // FLAG_SET_DEFAULT(EliminateZeroing, true); 2314 // } 2315 } 2316 2317 return JNI_OK; 2318 } 2319 2320 //=========================================================================================================== 2321 // Parsing of java.compiler property 2322 2323 void Arguments::process_java_compiler_argument(const char* arg) { 2324 // For backwards compatibility, Djava.compiler=NONE or "" 2325 // causes us to switch to -Xint mode UNLESS -Xdebug 2326 // is also specified. 2327 if (strlen(arg) == 0 || strcasecmp(arg, "NONE") == 0) { 2328 set_java_compiler(true); // "-Djava.compiler[=...]" most recently seen. 2329 } 2330 } 2331 2332 void Arguments::process_java_launcher_argument(const char* launcher, void* extra_info) { 2333 _sun_java_launcher = os::strdup_check_oom(launcher); 2334 } 2335 2336 bool Arguments::created_by_java_launcher() { 2337 assert(_sun_java_launcher != NULL, "property must have value"); 2338 return strcmp(DEFAULT_JAVA_LAUNCHER, _sun_java_launcher) != 0; 2339 } 2340 2341 bool Arguments::sun_java_launcher_is_altjvm() { 2342 return _sun_java_launcher_is_altjvm; 2343 } 2344 2345 //=========================================================================================================== 2346 // Parsing of main arguments 2347 2348 #if INCLUDE_JVMCI 2349 // Check consistency of jvmci vm argument settings. 2350 bool Arguments::check_jvmci_args_consistency() { 2351 return JVMCIGlobals::check_jvmci_flags_are_consistent(); 2352 } 2353 #endif //INCLUDE_JVMCI 2354 2355 // Check consistency of GC selection 2356 bool Arguments::check_gc_consistency() { 2357 // Ensure that the user has not selected conflicting sets 2358 // of collectors. 2359 uint i = 0; 2360 if (UseSerialGC) i++; 2361 if (UseConcMarkSweepGC) i++; 2362 if (UseParallelGC || UseParallelOldGC) i++; 2363 if (UseG1GC) i++; 2364 if (i > 1) { 2365 jio_fprintf(defaultStream::error_stream(), 2366 "Conflicting collector combinations in option list; " 2367 "please refer to the release notes for the combinations " 2368 "allowed\n"); 2369 return false; 2370 } 2371 2372 return true; 2373 } 2374 2375 // Check the consistency of vm_init_args 2376 bool Arguments::check_vm_args_consistency() { 2377 // Method for adding checks for flag consistency. 2378 // The intent is to warn the user of all possible conflicts, 2379 // before returning an error. 2380 // Note: Needs platform-dependent factoring. 2381 bool status = true; 2382 2383 if (TLABRefillWasteFraction == 0) { 2384 jio_fprintf(defaultStream::error_stream(), 2385 "TLABRefillWasteFraction should be a denominator, " 2386 "not " SIZE_FORMAT "\n", 2387 TLABRefillWasteFraction); 2388 status = false; 2389 } 2390 2391 if (FullGCALot && FLAG_IS_DEFAULT(MarkSweepAlwaysCompactCount)) { 2392 MarkSweepAlwaysCompactCount = 1; // Move objects every gc. 2393 } 2394 2395 if (!(UseParallelGC || UseParallelOldGC) && FLAG_IS_DEFAULT(ScavengeBeforeFullGC)) { 2396 FLAG_SET_DEFAULT(ScavengeBeforeFullGC, false); 2397 } 2398 2399 if (GCTimeLimit == 100) { 2400 // Turn off gc-overhead-limit-exceeded checks 2401 FLAG_SET_DEFAULT(UseGCOverheadLimit, false); 2402 } 2403 2404 status = status && check_gc_consistency(); 2405 2406 // CMS space iteration, which FLSVerifyAllHeapreferences entails, 2407 // insists that we hold the requisite locks so that the iteration is 2408 // MT-safe. For the verification at start-up and shut-down, we don't 2409 // yet have a good way of acquiring and releasing these locks, 2410 // which are not visible at the CollectedHeap level. We want to 2411 // be able to acquire these locks and then do the iteration rather 2412 // than just disable the lock verification. This will be fixed under 2413 // bug 4788986. 2414 if (UseConcMarkSweepGC && FLSVerifyAllHeapReferences) { 2415 if (VerifyDuringStartup) { 2416 warning("Heap verification at start-up disabled " 2417 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2418 VerifyDuringStartup = false; // Disable verification at start-up 2419 } 2420 2421 if (VerifyBeforeExit) { 2422 warning("Heap verification at shutdown disabled " 2423 "(due to current incompatibility with FLSVerifyAllHeapReferences)"); 2424 VerifyBeforeExit = false; // Disable verification at shutdown 2425 } 2426 } 2427 2428 if (PrintNMTStatistics) { 2429 #if INCLUDE_NMT 2430 if (MemTracker::tracking_level() == NMT_off) { 2431 #endif // INCLUDE_NMT 2432 warning("PrintNMTStatistics is disabled, because native memory tracking is not enabled"); 2433 PrintNMTStatistics = false; 2434 #if INCLUDE_NMT 2435 } 2436 #endif 2437 } 2438 2439 #if INCLUDE_JVMCI 2440 status = status && check_jvmci_args_consistency(); 2441 2442 if (EnableJVMCI) { 2443 if (!ScavengeRootsInCode) { 2444 warning("forcing ScavengeRootsInCode non-zero because JVMCI is enabled"); 2445 ScavengeRootsInCode = 1; 2446 } 2447 } 2448 #endif 2449 2450 // Check lower bounds of the code cache 2451 // Template Interpreter code is approximately 3X larger in debug builds. 2452 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); 2453 if (InitialCodeCacheSize < (uintx)os::vm_page_size()) { 2454 jio_fprintf(defaultStream::error_stream(), 2455 "Invalid InitialCodeCacheSize=%dK. Must be at least %dK.\n", InitialCodeCacheSize/K, 2456 os::vm_page_size()/K); 2457 status = false; 2458 } else if (ReservedCodeCacheSize < InitialCodeCacheSize) { 2459 jio_fprintf(defaultStream::error_stream(), 2460 "Invalid ReservedCodeCacheSize: %dK. Must be at least InitialCodeCacheSize=%dK.\n", 2461 ReservedCodeCacheSize/K, InitialCodeCacheSize/K); 2462 status = false; 2463 } else if (ReservedCodeCacheSize < min_code_cache_size) { 2464 jio_fprintf(defaultStream::error_stream(), 2465 "Invalid ReservedCodeCacheSize=%dK. Must be at least %uK.\n", ReservedCodeCacheSize/K, 2466 min_code_cache_size/K); 2467 status = false; 2468 } else if (ReservedCodeCacheSize > CODE_CACHE_SIZE_LIMIT) { 2469 // Code cache size larger than CODE_CACHE_SIZE_LIMIT is not supported. 2470 jio_fprintf(defaultStream::error_stream(), 2471 "Invalid ReservedCodeCacheSize=%dM. Must be at most %uM.\n", ReservedCodeCacheSize/M, 2472 CODE_CACHE_SIZE_LIMIT/M); 2473 status = false; 2474 } else if (NonNMethodCodeHeapSize < min_code_cache_size) { 2475 jio_fprintf(defaultStream::error_stream(), 2476 "Invalid NonNMethodCodeHeapSize=%dK. Must be at least %uK.\n", NonNMethodCodeHeapSize/K, 2477 min_code_cache_size/K); 2478 status = false; 2479 } 2480 2481 #ifdef _LP64 2482 if (!FLAG_IS_DEFAULT(CICompilerCount) && !FLAG_IS_DEFAULT(CICompilerCountPerCPU) && CICompilerCountPerCPU) { 2483 warning("The VM option CICompilerCountPerCPU overrides CICompilerCount."); 2484 } 2485 #endif 2486 2487 #ifndef SUPPORT_RESERVED_STACK_AREA 2488 if (StackReservedPages != 0) { 2489 FLAG_SET_CMDLINE(intx, StackReservedPages, 0); 2490 warning("Reserved Stack Area not supported on this platform"); 2491 } 2492 #endif 2493 2494 if (BackgroundCompilation && (CompileTheWorld || ReplayCompiles)) { 2495 if (!FLAG_IS_DEFAULT(BackgroundCompilation)) { 2496 warning("BackgroundCompilation disabled due to CompileTheWorld or ReplayCompiles options."); 2497 } 2498 FLAG_SET_CMDLINE(bool, BackgroundCompilation, false); 2499 } 2500 if (UseCompiler && is_interpreter_only()) { 2501 if (!FLAG_IS_DEFAULT(UseCompiler)) { 2502 warning("UseCompiler disabled due to -Xint."); 2503 } 2504 FLAG_SET_CMDLINE(bool, UseCompiler, false); 2505 } 2506 #ifdef COMPILER2 2507 if (PostLoopMultiversioning && !RangeCheckElimination) { 2508 if (!FLAG_IS_DEFAULT(PostLoopMultiversioning)) { 2509 warning("PostLoopMultiversioning disabled because RangeCheckElimination is disabled."); 2510 } 2511 FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false); 2512 } 2513 #endif 2514 return status; 2515 } 2516 2517 bool Arguments::is_bad_option(const JavaVMOption* option, jboolean ignore, 2518 const char* option_type) { 2519 if (ignore) return false; 2520 2521 const char* spacer = " "; 2522 if (option_type == NULL) { 2523 option_type = ++spacer; // Set both to the empty string. 2524 } 2525 2526 if (os::obsolete_option(option)) { 2527 jio_fprintf(defaultStream::error_stream(), 2528 "Obsolete %s%soption: %s\n", option_type, spacer, 2529 option->optionString); 2530 return false; 2531 } else { 2532 jio_fprintf(defaultStream::error_stream(), 2533 "Unrecognized %s%soption: %s\n", option_type, spacer, 2534 option->optionString); 2535 return true; 2536 } 2537 } 2538 2539 static const char* user_assertion_options[] = { 2540 "-da", "-ea", "-disableassertions", "-enableassertions", 0 2541 }; 2542 2543 static const char* system_assertion_options[] = { 2544 "-dsa", "-esa", "-disablesystemassertions", "-enablesystemassertions", 0 2545 }; 2546 2547 bool Arguments::parse_uintx(const char* value, 2548 uintx* uintx_arg, 2549 uintx min_size) { 2550 2551 // Check the sign first since atojulong() parses only unsigned values. 2552 bool value_is_positive = !(*value == '-'); 2553 2554 if (value_is_positive) { 2555 julong n; 2556 bool good_return = atojulong(value, &n); 2557 if (good_return) { 2558 bool above_minimum = n >= min_size; 2559 bool value_is_too_large = n > max_uintx; 2560 2561 if (above_minimum && !value_is_too_large) { 2562 *uintx_arg = n; 2563 return true; 2564 } 2565 } 2566 } 2567 return false; 2568 } 2569 2570 unsigned int addreads_count = 0; 2571 unsigned int addexports_count = 0; 2572 unsigned int addopens_count = 0; 2573 unsigned int addmods_count = 0; 2574 unsigned int patch_mod_count = 0; 2575 2576 bool Arguments::create_property(const char* prop_name, const char* prop_value, PropertyInternal internal) { 2577 size_t prop_len = strlen(prop_name) + strlen(prop_value) + 2; 2578 char* property = AllocateHeap(prop_len, mtArguments); 2579 int ret = jio_snprintf(property, prop_len, "%s=%s", prop_name, prop_value); 2580 if (ret < 0 || ret >= (int)prop_len) { 2581 FreeHeap(property); 2582 return false; 2583 } 2584 bool added = add_property(property, UnwriteableProperty, internal); 2585 FreeHeap(property); 2586 return added; 2587 } 2588 2589 bool Arguments::create_numbered_property(const char* prop_base_name, const char* prop_value, unsigned int count) { 2590 const unsigned int props_count_limit = 1000; 2591 const int props_count_limit_log10 = 3; 2592 const int extra_symbols_count = 3; // includes '.', '=', '\0' 2593 2594 // Make sure count is < props_count_limit. Otherwise, memory allocation will be too small. 2595 if (count < props_count_limit) { 2596 size_t prop_len = strlen(prop_base_name) + strlen(prop_value) + props_count_limit_log10 + extra_symbols_count; 2597 char* property = AllocateHeap(prop_len, mtArguments); 2598 int ret = jio_snprintf(property, prop_len, "%s.%d=%s", prop_base_name, count, prop_value); 2599 if (ret < 0 || ret >= (int)prop_len) { 2600 FreeHeap(property); 2601 jio_fprintf(defaultStream::error_stream(), "Failed to create property %s.%d=%s\n", prop_base_name, count, prop_value); 2602 return false; 2603 } 2604 bool added = add_property(property, UnwriteableProperty, InternalProperty); 2605 FreeHeap(property); 2606 return added; 2607 } 2608 2609 jio_fprintf(defaultStream::error_stream(), "Property count limit exceeded: %s, limit=%d\n", prop_base_name, props_count_limit); 2610 return false; 2611 } 2612 2613 Arguments::ArgsRange Arguments::parse_memory_size(const char* s, 2614 julong* long_arg, 2615 julong min_size) { 2616 if (!atojulong(s, long_arg)) return arg_unreadable; 2617 return check_memory_size(*long_arg, min_size); 2618 } 2619 2620 // Parse JavaVMInitArgs structure 2621 2622 jint Arguments::parse_vm_init_args(const JavaVMInitArgs *java_tool_options_args, 2623 const JavaVMInitArgs *java_options_args, 2624 const JavaVMInitArgs *cmd_line_args) { 2625 bool patch_mod_javabase = false; 2626 2627 // Save default settings for some mode flags 2628 Arguments::_AlwaysCompileLoopMethods = AlwaysCompileLoopMethods; 2629 Arguments::_UseOnStackReplacement = UseOnStackReplacement; 2630 Arguments::_ClipInlining = ClipInlining; 2631 Arguments::_BackgroundCompilation = BackgroundCompilation; 2632 if (TieredCompilation) { 2633 Arguments::_Tier3InvokeNotifyFreqLog = Tier3InvokeNotifyFreqLog; 2634 Arguments::_Tier4InvocationThreshold = Tier4InvocationThreshold; 2635 } 2636 2637 // Setup flags for mixed which is the default 2638 set_mode_flags(_mixed); 2639 2640 // Parse args structure generated from JAVA_TOOL_OPTIONS environment 2641 // variable (if present). 2642 jint result = parse_each_vm_init_arg(java_tool_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2643 if (result != JNI_OK) { 2644 return result; 2645 } 2646 2647 // Parse args structure generated from the command line flags. 2648 result = parse_each_vm_init_arg(cmd_line_args, &patch_mod_javabase, Flag::COMMAND_LINE); 2649 if (result != JNI_OK) { 2650 return result; 2651 } 2652 2653 // Parse args structure generated from the _JAVA_OPTIONS environment 2654 // variable (if present) (mimics classic VM) 2655 result = parse_each_vm_init_arg(java_options_args, &patch_mod_javabase, Flag::ENVIRON_VAR); 2656 if (result != JNI_OK) { 2657 return result; 2658 } 2659 2660 // Do final processing now that all arguments have been parsed 2661 result = finalize_vm_init_args(); 2662 if (result != JNI_OK) { 2663 return result; 2664 } 2665 2666 #if INCLUDE_CDS 2667 if (UseSharedSpaces && patch_mod_javabase) { 2668 no_shared_spaces("CDS is disabled when " JAVA_BASE_NAME " module is patched."); 2669 } 2670 #endif 2671 2672 return JNI_OK; 2673 } 2674 2675 // Checks if name in command-line argument -agent{lib,path}:name[=options] 2676 // represents a valid JDWP agent. is_path==true denotes that we 2677 // are dealing with -agentpath (case where name is a path), otherwise with 2678 // -agentlib 2679 bool valid_jdwp_agent(char *name, bool is_path) { 2680 char *_name; 2681 const char *_jdwp = "jdwp"; 2682 size_t _len_jdwp, _len_prefix; 2683 2684 if (is_path) { 2685 if ((_name = strrchr(name, (int) *os::file_separator())) == NULL) { 2686 return false; 2687 } 2688 2689 _name++; // skip past last path separator 2690 _len_prefix = strlen(JNI_LIB_PREFIX); 2691 2692 if (strncmp(_name, JNI_LIB_PREFIX, _len_prefix) != 0) { 2693 return false; 2694 } 2695 2696 _name += _len_prefix; 2697 _len_jdwp = strlen(_jdwp); 2698 2699 if (strncmp(_name, _jdwp, _len_jdwp) == 0) { 2700 _name += _len_jdwp; 2701 } 2702 else { 2703 return false; 2704 } 2705 2706 if (strcmp(_name, JNI_LIB_SUFFIX) != 0) { 2707 return false; 2708 } 2709 2710 return true; 2711 } 2712 2713 if (strcmp(name, _jdwp) == 0) { 2714 return true; 2715 } 2716 2717 return false; 2718 } 2719 2720 int Arguments::process_patch_mod_option(const char* patch_mod_tail, bool* patch_mod_javabase) { 2721 // --patch-module=<module>=<file>(<pathsep><file>)* 2722 assert(patch_mod_tail != NULL, "Unexpected NULL patch-module value"); 2723 // Find the equal sign between the module name and the path specification 2724 const char* module_equal = strchr(patch_mod_tail, '='); 2725 if (module_equal == NULL) { 2726 jio_fprintf(defaultStream::output_stream(), "Missing '=' in --patch-module specification\n"); 2727 return JNI_ERR; 2728 } else { 2729 // Pick out the module name 2730 size_t module_len = module_equal - patch_mod_tail; 2731 char* module_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, module_len+1, mtArguments); 2732 if (module_name != NULL) { 2733 memcpy(module_name, patch_mod_tail, module_len); 2734 *(module_name + module_len) = '\0'; 2735 // The path piece begins one past the module_equal sign 2736 add_patch_mod_prefix(module_name, module_equal + 1, patch_mod_javabase); 2737 FREE_C_HEAP_ARRAY(char, module_name); 2738 if (!create_numbered_property("jdk.module.patch", patch_mod_tail, patch_mod_count++)) { 2739 return JNI_ENOMEM; 2740 } 2741 } else { 2742 return JNI_ENOMEM; 2743 } 2744 } 2745 return JNI_OK; 2746 } 2747 2748 jint Arguments::parse_each_vm_init_arg(const JavaVMInitArgs* args, bool* patch_mod_javabase, Flag::Flags origin) { 2749 // For match_option to return remaining or value part of option string 2750 const char* tail; 2751 2752 // iterate over arguments 2753 for (int index = 0; index < args->nOptions; index++) { 2754 bool is_absolute_path = false; // for -agentpath vs -agentlib 2755 2756 const JavaVMOption* option = args->options + index; 2757 2758 if (!match_option(option, "-Djava.class.path", &tail) && 2759 !match_option(option, "-Dsun.java.command", &tail) && 2760 !match_option(option, "-Dsun.java.launcher", &tail)) { 2761 2762 // add all jvm options to the jvm_args string. This string 2763 // is used later to set the java.vm.args PerfData string constant. 2764 // the -Djava.class.path and the -Dsun.java.command options are 2765 // omitted from jvm_args string as each have their own PerfData 2766 // string constant object. 2767 build_jvm_args(option->optionString); 2768 } 2769 2770 // -verbose:[class/gc/jni] 2771 if (match_option(option, "-verbose", &tail)) { 2772 if (!strcmp(tail, ":class") || !strcmp(tail, "")) { 2773 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, load)); 2774 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, unload)); 2775 } else if (!strcmp(tail, ":gc")) { 2776 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(gc)); 2777 } else if (!strcmp(tail, ":jni")) { 2778 if (FLAG_SET_CMDLINE(bool, PrintJNIResolving, true) != Flag::SUCCESS) { 2779 return JNI_EINVAL; 2780 } 2781 } 2782 // -da / -ea / -disableassertions / -enableassertions 2783 // These accept an optional class/package name separated by a colon, e.g., 2784 // -da:java.lang.Thread. 2785 } else if (match_option(option, user_assertion_options, &tail, true)) { 2786 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2787 if (*tail == '\0') { 2788 JavaAssertions::setUserClassDefault(enable); 2789 } else { 2790 assert(*tail == ':', "bogus match by match_option()"); 2791 JavaAssertions::addOption(tail + 1, enable); 2792 } 2793 // -dsa / -esa / -disablesystemassertions / -enablesystemassertions 2794 } else if (match_option(option, system_assertion_options, &tail, false)) { 2795 bool enable = option->optionString[1] == 'e'; // char after '-' is 'e' 2796 JavaAssertions::setSystemClassDefault(enable); 2797 // -bootclasspath: 2798 } else if (match_option(option, "-Xbootclasspath:", &tail)) { 2799 jio_fprintf(defaultStream::output_stream(), 2800 "-Xbootclasspath is no longer a supported option.\n"); 2801 return JNI_EINVAL; 2802 // -bootclasspath/a: 2803 } else if (match_option(option, "-Xbootclasspath/a:", &tail)) { 2804 Arguments::append_sysclasspath(tail); 2805 // -bootclasspath/p: 2806 } else if (match_option(option, "-Xbootclasspath/p:", &tail)) { 2807 jio_fprintf(defaultStream::output_stream(), 2808 "-Xbootclasspath/p is no longer a supported option.\n"); 2809 return JNI_EINVAL; 2810 // -Xrun 2811 } else if (match_option(option, "-Xrun", &tail)) { 2812 if (tail != NULL) { 2813 const char* pos = strchr(tail, ':'); 2814 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2815 char* name = NEW_C_HEAP_ARRAY(char, len + 1, mtArguments); 2816 jio_snprintf(name, len + 1, "%s", tail); 2817 2818 char *options = NULL; 2819 if(pos != NULL) { 2820 size_t len2 = strlen(pos+1) + 1; // options start after ':'. Final zero must be copied. 2821 options = (char*)memcpy(NEW_C_HEAP_ARRAY(char, len2, mtArguments), pos+1, len2); 2822 } 2823 #if !INCLUDE_JVMTI 2824 if (strcmp(name, "jdwp") == 0) { 2825 jio_fprintf(defaultStream::error_stream(), 2826 "Debugging agents are not supported in this VM\n"); 2827 return JNI_ERR; 2828 } 2829 #endif // !INCLUDE_JVMTI 2830 add_init_library(name, options); 2831 } 2832 } else if (match_option(option, "--add-reads=", &tail)) { 2833 if (!create_numbered_property("jdk.module.addreads", tail, addreads_count++)) { 2834 return JNI_ENOMEM; 2835 } 2836 } else if (match_option(option, "--add-exports=", &tail)) { 2837 if (!create_numbered_property("jdk.module.addexports", tail, addexports_count++)) { 2838 return JNI_ENOMEM; 2839 } 2840 } else if (match_option(option, "--add-opens=", &tail)) { 2841 if (!create_numbered_property("jdk.module.addopens", tail, addopens_count++)) { 2842 return JNI_ENOMEM; 2843 } 2844 } else if (match_option(option, "--add-modules=", &tail)) { 2845 if (!create_numbered_property("jdk.module.addmods", tail, addmods_count++)) { 2846 return JNI_ENOMEM; 2847 } 2848 } else if (match_option(option, "--limit-modules=", &tail)) { 2849 if (!create_property("jdk.module.limitmods", tail, InternalProperty)) { 2850 return JNI_ENOMEM; 2851 } 2852 } else if (match_option(option, "--module-path=", &tail)) { 2853 if (!create_property("jdk.module.path", tail, ExternalProperty)) { 2854 return JNI_ENOMEM; 2855 } 2856 } else if (match_option(option, "--upgrade-module-path=", &tail)) { 2857 if (!create_property("jdk.module.upgrade.path", tail, ExternalProperty)) { 2858 return JNI_ENOMEM; 2859 } 2860 } else if (match_option(option, "--patch-module=", &tail)) { 2861 // --patch-module=<module>=<file>(<pathsep><file>)* 2862 int res = process_patch_mod_option(tail, patch_mod_javabase); 2863 if (res != JNI_OK) { 2864 return res; 2865 } 2866 // -agentlib and -agentpath 2867 } else if (match_option(option, "-agentlib:", &tail) || 2868 (is_absolute_path = match_option(option, "-agentpath:", &tail))) { 2869 if(tail != NULL) { 2870 const char* pos = strchr(tail, '='); 2871 size_t len = (pos == NULL) ? strlen(tail) : pos - tail; 2872 char* name = strncpy(NEW_C_HEAP_ARRAY(char, len + 1, mtArguments), tail, len); 2873 name[len] = '\0'; 2874 2875 char *options = NULL; 2876 if(pos != NULL) { 2877 options = os::strdup_check_oom(pos + 1, mtArguments); 2878 } 2879 #if !INCLUDE_JVMTI 2880 if (valid_jdwp_agent(name, is_absolute_path)) { 2881 jio_fprintf(defaultStream::error_stream(), 2882 "Debugging agents are not supported in this VM\n"); 2883 return JNI_ERR; 2884 } 2885 #endif // !INCLUDE_JVMTI 2886 add_init_agent(name, options, is_absolute_path); 2887 } 2888 // -javaagent 2889 } else if (match_option(option, "-javaagent:", &tail)) { 2890 #if !INCLUDE_JVMTI 2891 jio_fprintf(defaultStream::error_stream(), 2892 "Instrumentation agents are not supported in this VM\n"); 2893 return JNI_ERR; 2894 #else 2895 if (tail != NULL) { 2896 size_t length = strlen(tail) + 1; 2897 char *options = NEW_C_HEAP_ARRAY(char, length, mtArguments); 2898 jio_snprintf(options, length, "%s", tail); 2899 add_init_agent("instrument", options, false); 2900 // java agents need module java.instrument 2901 if (!create_numbered_property("jdk.module.addmods", "java.instrument", addmods_count++)) { 2902 return JNI_ENOMEM; 2903 } 2904 } 2905 #endif // !INCLUDE_JVMTI 2906 // -Xnoclassgc 2907 } else if (match_option(option, "-Xnoclassgc")) { 2908 if (FLAG_SET_CMDLINE(bool, ClassUnloading, false) != Flag::SUCCESS) { 2909 return JNI_EINVAL; 2910 } 2911 // -Xconcgc 2912 } else if (match_option(option, "-Xconcgc")) { 2913 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, true) != Flag::SUCCESS) { 2914 return JNI_EINVAL; 2915 } 2916 handle_extra_cms_flags("-Xconcgc uses UseConcMarkSweepGC"); 2917 // -Xnoconcgc 2918 } else if (match_option(option, "-Xnoconcgc")) { 2919 if (FLAG_SET_CMDLINE(bool, UseConcMarkSweepGC, false) != Flag::SUCCESS) { 2920 return JNI_EINVAL; 2921 } 2922 handle_extra_cms_flags("-Xnoconcgc uses UseConcMarkSweepGC"); 2923 // -Xbatch 2924 } else if (match_option(option, "-Xbatch")) { 2925 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 2926 return JNI_EINVAL; 2927 } 2928 // -Xmn for compatibility with other JVM vendors 2929 } else if (match_option(option, "-Xmn", &tail)) { 2930 julong long_initial_young_size = 0; 2931 ArgsRange errcode = parse_memory_size(tail, &long_initial_young_size, 1); 2932 if (errcode != arg_in_range) { 2933 jio_fprintf(defaultStream::error_stream(), 2934 "Invalid initial young generation size: %s\n", option->optionString); 2935 describe_range_error(errcode); 2936 return JNI_EINVAL; 2937 } 2938 if (FLAG_SET_CMDLINE(size_t, MaxNewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2939 return JNI_EINVAL; 2940 } 2941 if (FLAG_SET_CMDLINE(size_t, NewSize, (size_t)long_initial_young_size) != Flag::SUCCESS) { 2942 return JNI_EINVAL; 2943 } 2944 // -Xms 2945 } else if (match_option(option, "-Xms", &tail)) { 2946 julong long_initial_heap_size = 0; 2947 // an initial heap size of 0 means automatically determine 2948 ArgsRange errcode = parse_memory_size(tail, &long_initial_heap_size, 0); 2949 if (errcode != arg_in_range) { 2950 jio_fprintf(defaultStream::error_stream(), 2951 "Invalid initial heap size: %s\n", option->optionString); 2952 describe_range_error(errcode); 2953 return JNI_EINVAL; 2954 } 2955 set_min_heap_size((size_t)long_initial_heap_size); 2956 // Currently the minimum size and the initial heap sizes are the same. 2957 // Can be overridden with -XX:InitialHeapSize. 2958 if (FLAG_SET_CMDLINE(size_t, InitialHeapSize, (size_t)long_initial_heap_size) != Flag::SUCCESS) { 2959 return JNI_EINVAL; 2960 } 2961 // -Xmx 2962 } else if (match_option(option, "-Xmx", &tail) || match_option(option, "-XX:MaxHeapSize=", &tail)) { 2963 julong long_max_heap_size = 0; 2964 ArgsRange errcode = parse_memory_size(tail, &long_max_heap_size, 1); 2965 if (errcode != arg_in_range) { 2966 jio_fprintf(defaultStream::error_stream(), 2967 "Invalid maximum heap size: %s\n", option->optionString); 2968 describe_range_error(errcode); 2969 return JNI_EINVAL; 2970 } 2971 if (FLAG_SET_CMDLINE(size_t, MaxHeapSize, (size_t)long_max_heap_size) != Flag::SUCCESS) { 2972 return JNI_EINVAL; 2973 } 2974 // Xmaxf 2975 } else if (match_option(option, "-Xmaxf", &tail)) { 2976 char* err; 2977 int maxf = (int)(strtod(tail, &err) * 100); 2978 if (*err != '\0' || *tail == '\0') { 2979 jio_fprintf(defaultStream::error_stream(), 2980 "Bad max heap free percentage size: %s\n", 2981 option->optionString); 2982 return JNI_EINVAL; 2983 } else { 2984 if (FLAG_SET_CMDLINE(uintx, MaxHeapFreeRatio, maxf) != Flag::SUCCESS) { 2985 return JNI_EINVAL; 2986 } 2987 } 2988 // Xminf 2989 } else if (match_option(option, "-Xminf", &tail)) { 2990 char* err; 2991 int minf = (int)(strtod(tail, &err) * 100); 2992 if (*err != '\0' || *tail == '\0') { 2993 jio_fprintf(defaultStream::error_stream(), 2994 "Bad min heap free percentage size: %s\n", 2995 option->optionString); 2996 return JNI_EINVAL; 2997 } else { 2998 if (FLAG_SET_CMDLINE(uintx, MinHeapFreeRatio, minf) != Flag::SUCCESS) { 2999 return JNI_EINVAL; 3000 } 3001 } 3002 // -Xss 3003 } else if (match_option(option, "-Xss", &tail)) { 3004 julong long_ThreadStackSize = 0; 3005 ArgsRange errcode = parse_memory_size(tail, &long_ThreadStackSize, 1000); 3006 if (errcode != arg_in_range) { 3007 jio_fprintf(defaultStream::error_stream(), 3008 "Invalid thread stack size: %s\n", option->optionString); 3009 describe_range_error(errcode); 3010 return JNI_EINVAL; 3011 } 3012 // Internally track ThreadStackSize in units of 1024 bytes. 3013 if (FLAG_SET_CMDLINE(intx, ThreadStackSize, 3014 round_to((int)long_ThreadStackSize, K) / K) != Flag::SUCCESS) { 3015 return JNI_EINVAL; 3016 } 3017 // -Xoss, -Xsqnopause, -Xoptimize, -Xboundthreads, -Xusealtsigs 3018 } else if (match_option(option, "-Xoss", &tail) || 3019 match_option(option, "-Xsqnopause") || 3020 match_option(option, "-Xoptimize") || 3021 match_option(option, "-Xboundthreads") || 3022 match_option(option, "-Xusealtsigs")) { 3023 // All these options are deprecated in JDK 9 and will be removed in a future release 3024 char version[256]; 3025 JDK_Version::jdk(9).to_string(version, sizeof(version)); 3026 warning("Ignoring option %s; support was removed in %s", option->optionString, version); 3027 } else if (match_option(option, "-XX:CodeCacheExpansionSize=", &tail)) { 3028 julong long_CodeCacheExpansionSize = 0; 3029 ArgsRange errcode = parse_memory_size(tail, &long_CodeCacheExpansionSize, os::vm_page_size()); 3030 if (errcode != arg_in_range) { 3031 jio_fprintf(defaultStream::error_stream(), 3032 "Invalid argument: %s. Must be at least %luK.\n", option->optionString, 3033 os::vm_page_size()/K); 3034 return JNI_EINVAL; 3035 } 3036 if (FLAG_SET_CMDLINE(uintx, CodeCacheExpansionSize, (uintx)long_CodeCacheExpansionSize) != Flag::SUCCESS) { 3037 return JNI_EINVAL; 3038 } 3039 } else if (match_option(option, "-Xmaxjitcodesize", &tail) || 3040 match_option(option, "-XX:ReservedCodeCacheSize=", &tail)) { 3041 julong long_ReservedCodeCacheSize = 0; 3042 3043 ArgsRange errcode = parse_memory_size(tail, &long_ReservedCodeCacheSize, 1); 3044 if (errcode != arg_in_range) { 3045 jio_fprintf(defaultStream::error_stream(), 3046 "Invalid maximum code cache size: %s.\n", option->optionString); 3047 return JNI_EINVAL; 3048 } 3049 if (FLAG_SET_CMDLINE(uintx, ReservedCodeCacheSize, (uintx)long_ReservedCodeCacheSize) != Flag::SUCCESS) { 3050 return JNI_EINVAL; 3051 } 3052 // -XX:NonNMethodCodeHeapSize= 3053 } else if (match_option(option, "-XX:NonNMethodCodeHeapSize=", &tail)) { 3054 julong long_NonNMethodCodeHeapSize = 0; 3055 3056 ArgsRange errcode = parse_memory_size(tail, &long_NonNMethodCodeHeapSize, 1); 3057 if (errcode != arg_in_range) { 3058 jio_fprintf(defaultStream::error_stream(), 3059 "Invalid maximum non-nmethod code heap size: %s.\n", option->optionString); 3060 return JNI_EINVAL; 3061 } 3062 if (FLAG_SET_CMDLINE(uintx, NonNMethodCodeHeapSize, (uintx)long_NonNMethodCodeHeapSize) != Flag::SUCCESS) { 3063 return JNI_EINVAL; 3064 } 3065 // -XX:ProfiledCodeHeapSize= 3066 } else if (match_option(option, "-XX:ProfiledCodeHeapSize=", &tail)) { 3067 julong long_ProfiledCodeHeapSize = 0; 3068 3069 ArgsRange errcode = parse_memory_size(tail, &long_ProfiledCodeHeapSize, 1); 3070 if (errcode != arg_in_range) { 3071 jio_fprintf(defaultStream::error_stream(), 3072 "Invalid maximum profiled code heap size: %s.\n", option->optionString); 3073 return JNI_EINVAL; 3074 } 3075 if (FLAG_SET_CMDLINE(uintx, ProfiledCodeHeapSize, (uintx)long_ProfiledCodeHeapSize) != Flag::SUCCESS) { 3076 return JNI_EINVAL; 3077 } 3078 // -XX:NonProfiledCodeHeapSizee= 3079 } else if (match_option(option, "-XX:NonProfiledCodeHeapSize=", &tail)) { 3080 julong long_NonProfiledCodeHeapSize = 0; 3081 3082 ArgsRange errcode = parse_memory_size(tail, &long_NonProfiledCodeHeapSize, 1); 3083 if (errcode != arg_in_range) { 3084 jio_fprintf(defaultStream::error_stream(), 3085 "Invalid maximum non-profiled code heap size: %s.\n", option->optionString); 3086 return JNI_EINVAL; 3087 } 3088 if (FLAG_SET_CMDLINE(uintx, NonProfiledCodeHeapSize, (uintx)long_NonProfiledCodeHeapSize) != Flag::SUCCESS) { 3089 return JNI_EINVAL; 3090 } 3091 // -green 3092 } else if (match_option(option, "-green")) { 3093 jio_fprintf(defaultStream::error_stream(), 3094 "Green threads support not available\n"); 3095 return JNI_EINVAL; 3096 // -native 3097 } else if (match_option(option, "-native")) { 3098 // HotSpot always uses native threads, ignore silently for compatibility 3099 // -Xrs 3100 } else if (match_option(option, "-Xrs")) { 3101 // Classic/EVM option, new functionality 3102 if (FLAG_SET_CMDLINE(bool, ReduceSignalUsage, true) != Flag::SUCCESS) { 3103 return JNI_EINVAL; 3104 } 3105 // -Xprof 3106 } else if (match_option(option, "-Xprof")) { 3107 #if INCLUDE_FPROF 3108 _has_profile = true; 3109 #else // INCLUDE_FPROF 3110 jio_fprintf(defaultStream::error_stream(), 3111 "Flat profiling is not supported in this VM.\n"); 3112 return JNI_ERR; 3113 #endif // INCLUDE_FPROF 3114 // -Xconcurrentio 3115 } else if (match_option(option, "-Xconcurrentio")) { 3116 if (FLAG_SET_CMDLINE(bool, UseLWPSynchronization, true) != Flag::SUCCESS) { 3117 return JNI_EINVAL; 3118 } 3119 if (FLAG_SET_CMDLINE(bool, BackgroundCompilation, false) != Flag::SUCCESS) { 3120 return JNI_EINVAL; 3121 } 3122 if (FLAG_SET_CMDLINE(intx, DeferThrSuspendLoopCount, 1) != Flag::SUCCESS) { 3123 return JNI_EINVAL; 3124 } 3125 if (FLAG_SET_CMDLINE(bool, UseTLAB, false) != Flag::SUCCESS) { 3126 return JNI_EINVAL; 3127 } 3128 if (FLAG_SET_CMDLINE(size_t, NewSizeThreadIncrease, 16 * K) != Flag::SUCCESS) { // 20Kb per thread added to new generation 3129 return JNI_EINVAL; 3130 } 3131 3132 // -Xinternalversion 3133 } else if (match_option(option, "-Xinternalversion")) { 3134 jio_fprintf(defaultStream::output_stream(), "%s\n", 3135 VM_Version::internal_vm_info_string()); 3136 vm_exit(0); 3137 #ifndef PRODUCT 3138 // -Xprintflags 3139 } else if (match_option(option, "-Xprintflags")) { 3140 CommandLineFlags::printFlags(tty, false); 3141 vm_exit(0); 3142 #endif 3143 // -D 3144 } else if (match_option(option, "-D", &tail)) { 3145 const char* value; 3146 if (match_option(option, "-Djava.endorsed.dirs=", &value) && 3147 *value!= '\0' && strcmp(value, "\"\"") != 0) { 3148 // abort if -Djava.endorsed.dirs is set 3149 jio_fprintf(defaultStream::output_stream(), 3150 "-Djava.endorsed.dirs=%s is not supported. Endorsed standards and standalone APIs\n" 3151 "in modular form will be supported via the concept of upgradeable modules.\n", value); 3152 return JNI_EINVAL; 3153 } 3154 if (match_option(option, "-Djava.ext.dirs=", &value) && 3155 *value != '\0' && strcmp(value, "\"\"") != 0) { 3156 // abort if -Djava.ext.dirs is set 3157 jio_fprintf(defaultStream::output_stream(), 3158 "-Djava.ext.dirs=%s is not supported. Use -classpath instead.\n", value); 3159 return JNI_EINVAL; 3160 } 3161 // Check for module related properties. They must be set using the modules 3162 // options. For example: use "--add-modules=java.sql", not 3163 // "-Djdk.module.addmods=java.sql" 3164 if (is_internal_module_property(option->optionString + 2)) { 3165 needs_module_property_warning = true; 3166 continue; 3167 } 3168 3169 if (!add_property(tail)) { 3170 return JNI_ENOMEM; 3171 } 3172 // Out of the box management support 3173 if (match_option(option, "-Dcom.sun.management", &tail)) { 3174 #if INCLUDE_MANAGEMENT 3175 if (FLAG_SET_CMDLINE(bool, ManagementServer, true) != Flag::SUCCESS) { 3176 return JNI_EINVAL; 3177 } 3178 // management agent in module jdk.management.agent 3179 if (!create_numbered_property("jdk.module.addmods", "jdk.management.agent", addmods_count++)) { 3180 return JNI_ENOMEM; 3181 } 3182 #else 3183 jio_fprintf(defaultStream::output_stream(), 3184 "-Dcom.sun.management is not supported in this VM.\n"); 3185 return JNI_ERR; 3186 #endif 3187 } 3188 // -Xint 3189 } else if (match_option(option, "-Xint")) { 3190 set_mode_flags(_int); 3191 // -Xmixed 3192 } else if (match_option(option, "-Xmixed")) { 3193 set_mode_flags(_mixed); 3194 // -Xcomp 3195 } else if (match_option(option, "-Xcomp")) { 3196 // for testing the compiler; turn off all flags that inhibit compilation 3197 set_mode_flags(_comp); 3198 // -Xshare:dump 3199 } else if (match_option(option, "-Xshare:dump")) { 3200 if (FLAG_SET_CMDLINE(bool, DumpSharedSpaces, true) != Flag::SUCCESS) { 3201 return JNI_EINVAL; 3202 } 3203 set_mode_flags(_int); // Prevent compilation, which creates objects 3204 // -Xshare:on 3205 } else if (match_option(option, "-Xshare:on")) { 3206 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3207 return JNI_EINVAL; 3208 } 3209 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3210 return JNI_EINVAL; 3211 } 3212 // -Xshare:auto 3213 } else if (match_option(option, "-Xshare:auto")) { 3214 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3215 return JNI_EINVAL; 3216 } 3217 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3218 return JNI_EINVAL; 3219 } 3220 // -Xshare:off 3221 } else if (match_option(option, "-Xshare:off")) { 3222 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, false) != Flag::SUCCESS) { 3223 return JNI_EINVAL; 3224 } 3225 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, false) != Flag::SUCCESS) { 3226 return JNI_EINVAL; 3227 } 3228 // -Xverify 3229 } else if (match_option(option, "-Xverify", &tail)) { 3230 if (strcmp(tail, ":all") == 0 || strcmp(tail, "") == 0) { 3231 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, true) != Flag::SUCCESS) { 3232 return JNI_EINVAL; 3233 } 3234 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3235 return JNI_EINVAL; 3236 } 3237 } else if (strcmp(tail, ":remote") == 0) { 3238 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3239 return JNI_EINVAL; 3240 } 3241 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, true) != Flag::SUCCESS) { 3242 return JNI_EINVAL; 3243 } 3244 } else if (strcmp(tail, ":none") == 0) { 3245 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationLocal, false) != Flag::SUCCESS) { 3246 return JNI_EINVAL; 3247 } 3248 if (FLAG_SET_CMDLINE(bool, BytecodeVerificationRemote, false) != Flag::SUCCESS) { 3249 return JNI_EINVAL; 3250 } 3251 } else if (is_bad_option(option, args->ignoreUnrecognized, "verification")) { 3252 return JNI_EINVAL; 3253 } 3254 // -Xdebug 3255 } else if (match_option(option, "-Xdebug")) { 3256 // note this flag has been used, then ignore 3257 set_xdebug_mode(true); 3258 // -Xnoagent 3259 } else if (match_option(option, "-Xnoagent")) { 3260 // For compatibility with classic. HotSpot refuses to load the old style agent.dll. 3261 } else if (match_option(option, "-Xloggc:", &tail)) { 3262 // Deprecated flag to redirect GC output to a file. -Xloggc:<filename> 3263 log_warning(gc)("-Xloggc is deprecated. Will use -Xlog:gc:%s instead.", tail); 3264 _gc_log_filename = os::strdup_check_oom(tail); 3265 } else if (match_option(option, "-Xlog", &tail)) { 3266 bool ret = false; 3267 if (strcmp(tail, ":help") == 0) { 3268 LogConfiguration::print_command_line_help(defaultStream::output_stream()); 3269 vm_exit(0); 3270 } else if (strcmp(tail, ":disable") == 0) { 3271 LogConfiguration::disable_logging(); 3272 ret = true; 3273 } else if (*tail == '\0') { 3274 ret = LogConfiguration::parse_command_line_arguments(); 3275 assert(ret, "-Xlog without arguments should never fail to parse"); 3276 } else if (*tail == ':') { 3277 ret = LogConfiguration::parse_command_line_arguments(tail + 1); 3278 } 3279 if (ret == false) { 3280 jio_fprintf(defaultStream::error_stream(), 3281 "Invalid -Xlog option '-Xlog%s'\n", 3282 tail); 3283 return JNI_EINVAL; 3284 } 3285 // JNI hooks 3286 } else if (match_option(option, "-Xcheck", &tail)) { 3287 if (!strcmp(tail, ":jni")) { 3288 #if !INCLUDE_JNI_CHECK 3289 warning("JNI CHECKING is not supported in this VM"); 3290 #else 3291 CheckJNICalls = true; 3292 #endif // INCLUDE_JNI_CHECK 3293 } else if (is_bad_option(option, args->ignoreUnrecognized, 3294 "check")) { 3295 return JNI_EINVAL; 3296 } 3297 } else if (match_option(option, "vfprintf")) { 3298 _vfprintf_hook = CAST_TO_FN_PTR(vfprintf_hook_t, option->extraInfo); 3299 } else if (match_option(option, "exit")) { 3300 _exit_hook = CAST_TO_FN_PTR(exit_hook_t, option->extraInfo); 3301 } else if (match_option(option, "abort")) { 3302 _abort_hook = CAST_TO_FN_PTR(abort_hook_t, option->extraInfo); 3303 // -XX:+AggressiveHeap 3304 } else if (match_option(option, "-XX:+AggressiveHeap")) { 3305 jint result = set_aggressive_heap_flags(); 3306 if (result != JNI_OK) { 3307 return result; 3308 } 3309 // Need to keep consistency of MaxTenuringThreshold and AlwaysTenure/NeverTenure; 3310 // and the last option wins. 3311 } else if (match_option(option, "-XX:+NeverTenure")) { 3312 if (FLAG_SET_CMDLINE(bool, NeverTenure, true) != Flag::SUCCESS) { 3313 return JNI_EINVAL; 3314 } 3315 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3316 return JNI_EINVAL; 3317 } 3318 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, markOopDesc::max_age + 1) != Flag::SUCCESS) { 3319 return JNI_EINVAL; 3320 } 3321 } else if (match_option(option, "-XX:+AlwaysTenure")) { 3322 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3323 return JNI_EINVAL; 3324 } 3325 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3326 return JNI_EINVAL; 3327 } 3328 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, 0) != Flag::SUCCESS) { 3329 return JNI_EINVAL; 3330 } 3331 } else if (match_option(option, "-XX:MaxTenuringThreshold=", &tail)) { 3332 uintx max_tenuring_thresh = 0; 3333 if (!parse_uintx(tail, &max_tenuring_thresh, 0)) { 3334 jio_fprintf(defaultStream::error_stream(), 3335 "Improperly specified VM option \'MaxTenuringThreshold=%s\'\n", tail); 3336 return JNI_EINVAL; 3337 } 3338 3339 if (FLAG_SET_CMDLINE(uintx, MaxTenuringThreshold, max_tenuring_thresh) != Flag::SUCCESS) { 3340 return JNI_EINVAL; 3341 } 3342 3343 if (MaxTenuringThreshold == 0) { 3344 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3345 return JNI_EINVAL; 3346 } 3347 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, true) != Flag::SUCCESS) { 3348 return JNI_EINVAL; 3349 } 3350 } else { 3351 if (FLAG_SET_CMDLINE(bool, NeverTenure, false) != Flag::SUCCESS) { 3352 return JNI_EINVAL; 3353 } 3354 if (FLAG_SET_CMDLINE(bool, AlwaysTenure, false) != Flag::SUCCESS) { 3355 return JNI_EINVAL; 3356 } 3357 } 3358 } else if (match_option(option, "-XX:+DisplayVMOutputToStderr")) { 3359 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, false) != Flag::SUCCESS) { 3360 return JNI_EINVAL; 3361 } 3362 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, true) != Flag::SUCCESS) { 3363 return JNI_EINVAL; 3364 } 3365 } else if (match_option(option, "-XX:+DisplayVMOutputToStdout")) { 3366 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStderr, false) != Flag::SUCCESS) { 3367 return JNI_EINVAL; 3368 } 3369 if (FLAG_SET_CMDLINE(bool, DisplayVMOutputToStdout, true) != Flag::SUCCESS) { 3370 return JNI_EINVAL; 3371 } 3372 } else if (match_option(option, "-XX:+ExtendedDTraceProbes")) { 3373 #if defined(DTRACE_ENABLED) 3374 if (FLAG_SET_CMDLINE(bool, ExtendedDTraceProbes, true) != Flag::SUCCESS) { 3375 return JNI_EINVAL; 3376 } 3377 if (FLAG_SET_CMDLINE(bool, DTraceMethodProbes, true) != Flag::SUCCESS) { 3378 return JNI_EINVAL; 3379 } 3380 if (FLAG_SET_CMDLINE(bool, DTraceAllocProbes, true) != Flag::SUCCESS) { 3381 return JNI_EINVAL; 3382 } 3383 if (FLAG_SET_CMDLINE(bool, DTraceMonitorProbes, true) != Flag::SUCCESS) { 3384 return JNI_EINVAL; 3385 } 3386 #else // defined(DTRACE_ENABLED) 3387 jio_fprintf(defaultStream::error_stream(), 3388 "ExtendedDTraceProbes flag is not applicable for this configuration\n"); 3389 return JNI_EINVAL; 3390 #endif // defined(DTRACE_ENABLED) 3391 #ifdef ASSERT 3392 } else if (match_option(option, "-XX:+FullGCALot")) { 3393 if (FLAG_SET_CMDLINE(bool, FullGCALot, true) != Flag::SUCCESS) { 3394 return JNI_EINVAL; 3395 } 3396 // disable scavenge before parallel mark-compact 3397 if (FLAG_SET_CMDLINE(bool, ScavengeBeforeFullGC, false) != Flag::SUCCESS) { 3398 return JNI_EINVAL; 3399 } 3400 #endif 3401 #if !INCLUDE_MANAGEMENT 3402 } else if (match_option(option, "-XX:+ManagementServer")) { 3403 jio_fprintf(defaultStream::error_stream(), 3404 "ManagementServer is not supported in this VM.\n"); 3405 return JNI_ERR; 3406 #endif // INCLUDE_MANAGEMENT 3407 } else if (match_option(option, "-XX:", &tail)) { // -XX:xxxx 3408 // Skip -XX:Flags= and -XX:VMOptionsFile= since those cases have 3409 // already been handled 3410 if ((strncmp(tail, "Flags=", strlen("Flags=")) != 0) && 3411 (strncmp(tail, "VMOptionsFile=", strlen("VMOptionsFile=")) != 0)) { 3412 if (!process_argument(tail, args->ignoreUnrecognized, origin)) { 3413 return JNI_EINVAL; 3414 } 3415 } 3416 // Unknown option 3417 } else if (is_bad_option(option, args->ignoreUnrecognized)) { 3418 return JNI_ERR; 3419 } 3420 } 3421 3422 // PrintSharedArchiveAndExit will turn on 3423 // -Xshare:on 3424 // -Xlog:class+path=info 3425 if (PrintSharedArchiveAndExit) { 3426 if (FLAG_SET_CMDLINE(bool, UseSharedSpaces, true) != Flag::SUCCESS) { 3427 return JNI_EINVAL; 3428 } 3429 if (FLAG_SET_CMDLINE(bool, RequireSharedSpaces, true) != Flag::SUCCESS) { 3430 return JNI_EINVAL; 3431 } 3432 LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(class, path)); 3433 } 3434 3435 // Change the default value for flags which have different default values 3436 // when working with older JDKs. 3437 #ifdef LINUX 3438 if (JDK_Version::current().compare_major(6) <= 0 && 3439 FLAG_IS_DEFAULT(UseLinuxPosixThreadCPUClocks)) { 3440 FLAG_SET_DEFAULT(UseLinuxPosixThreadCPUClocks, false); 3441 } 3442 #endif // LINUX 3443 fix_appclasspath(); 3444 return JNI_OK; 3445 } 3446 3447 void Arguments::add_patch_mod_prefix(const char* module_name, const char* path, bool* patch_mod_javabase) { 3448 // For java.base check for duplicate --patch-module options being specified on the command line. 3449 // This check is only required for java.base, all other duplicate module specifications 3450 // will be checked during module system initialization. The module system initialization 3451 // will throw an ExceptionInInitializerError if this situation occurs. 3452 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 3453 if (*patch_mod_javabase) { 3454 vm_exit_during_initialization("Cannot specify " JAVA_BASE_NAME " more than once to --patch-module"); 3455 } else { 3456 *patch_mod_javabase = true; 3457 } 3458 } 3459 3460 // Create GrowableArray lazily, only if --patch-module has been specified 3461 if (_patch_mod_prefix == NULL) { 3462 _patch_mod_prefix = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<ModulePatchPath*>(10, true); 3463 } 3464 3465 _patch_mod_prefix->push(new ModulePatchPath(module_name, path)); 3466 } 3467 3468 // Remove all empty paths from the app classpath (if IgnoreEmptyClassPaths is enabled) 3469 // 3470 // This is necessary because some apps like to specify classpath like -cp foo.jar:${XYZ}:bar.jar 3471 // in their start-up scripts. If XYZ is empty, the classpath will look like "-cp foo.jar::bar.jar". 3472 // Java treats such empty paths as if the user specified "-cp foo.jar:.:bar.jar". I.e., an empty 3473 // path is treated as the current directory. 3474 // 3475 // This causes problems with CDS, which requires that all directories specified in the classpath 3476 // must be empty. In most cases, applications do NOT want to load classes from the current 3477 // directory anyway. Adding -XX:+IgnoreEmptyClassPaths will make these applications' start-up 3478 // scripts compatible with CDS. 3479 void Arguments::fix_appclasspath() { 3480 if (IgnoreEmptyClassPaths) { 3481 const char separator = *os::path_separator(); 3482 const char* src = _java_class_path->value(); 3483 3484 // skip over all the leading empty paths 3485 while (*src == separator) { 3486 src ++; 3487 } 3488 3489 char* copy = os::strdup_check_oom(src, mtArguments); 3490 3491 // trim all trailing empty paths 3492 for (char* tail = copy + strlen(copy) - 1; tail >= copy && *tail == separator; tail--) { 3493 *tail = '\0'; 3494 } 3495 3496 char from[3] = {separator, separator, '\0'}; 3497 char to [2] = {separator, '\0'}; 3498 while (StringUtils::replace_no_expand(copy, from, to) > 0) { 3499 // Keep replacing "::" -> ":" until we have no more "::" (non-windows) 3500 // Keep replacing ";;" -> ";" until we have no more ";;" (windows) 3501 } 3502 3503 _java_class_path->set_writeable_value(copy); 3504 FreeHeap(copy); // a copy was made by set_value, so don't need this anymore 3505 } 3506 } 3507 3508 static bool has_jar_files(const char* directory) { 3509 DIR* dir = os::opendir(directory); 3510 if (dir == NULL) return false; 3511 3512 struct dirent *entry; 3513 char *dbuf = NEW_C_HEAP_ARRAY(char, os::readdir_buf_size(directory), mtArguments); 3514 bool hasJarFile = false; 3515 while (!hasJarFile && (entry = os::readdir(dir, (dirent *) dbuf)) != NULL) { 3516 const char* name = entry->d_name; 3517 const char* ext = name + strlen(name) - 4; 3518 hasJarFile = ext > name && (os::file_name_strcmp(ext, ".jar") == 0); 3519 } 3520 FREE_C_HEAP_ARRAY(char, dbuf); 3521 os::closedir(dir); 3522 return hasJarFile ; 3523 } 3524 3525 static int check_non_empty_dirs(const char* path) { 3526 const char separator = *os::path_separator(); 3527 const char* const end = path + strlen(path); 3528 int nonEmptyDirs = 0; 3529 while (path < end) { 3530 const char* tmp_end = strchr(path, separator); 3531 if (tmp_end == NULL) { 3532 if (has_jar_files(path)) { 3533 nonEmptyDirs++; 3534 jio_fprintf(defaultStream::output_stream(), 3535 "Non-empty directory: %s\n", path); 3536 } 3537 path = end; 3538 } else { 3539 char* dirpath = NEW_C_HEAP_ARRAY(char, tmp_end - path + 1, mtArguments); 3540 memcpy(dirpath, path, tmp_end - path); 3541 dirpath[tmp_end - path] = '\0'; 3542 if (has_jar_files(dirpath)) { 3543 nonEmptyDirs++; 3544 jio_fprintf(defaultStream::output_stream(), 3545 "Non-empty directory: %s\n", dirpath); 3546 } 3547 FREE_C_HEAP_ARRAY(char, dirpath); 3548 path = tmp_end + 1; 3549 } 3550 } 3551 return nonEmptyDirs; 3552 } 3553 3554 jint Arguments::finalize_vm_init_args() { 3555 // check if the default lib/endorsed directory exists; if so, error 3556 char path[JVM_MAXPATHLEN]; 3557 const char* fileSep = os::file_separator(); 3558 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sendorsed", Arguments::get_java_home(), fileSep, fileSep); 3559 3560 if (CheckEndorsedAndExtDirs) { 3561 int nonEmptyDirs = 0; 3562 // check endorsed directory 3563 nonEmptyDirs += check_non_empty_dirs(path); 3564 // check the extension directories 3565 nonEmptyDirs += check_non_empty_dirs(Arguments::get_ext_dirs()); 3566 if (nonEmptyDirs > 0) { 3567 return JNI_ERR; 3568 } 3569 } 3570 3571 DIR* dir = os::opendir(path); 3572 if (dir != NULL) { 3573 jio_fprintf(defaultStream::output_stream(), 3574 "<JAVA_HOME>/lib/endorsed is not supported. Endorsed standards and standalone APIs\n" 3575 "in modular form will be supported via the concept of upgradeable modules.\n"); 3576 os::closedir(dir); 3577 return JNI_ERR; 3578 } 3579 3580 jio_snprintf(path, JVM_MAXPATHLEN, "%s%slib%sext", Arguments::get_java_home(), fileSep, fileSep); 3581 dir = os::opendir(path); 3582 if (dir != NULL) { 3583 jio_fprintf(defaultStream::output_stream(), 3584 "<JAVA_HOME>/lib/ext exists, extensions mechanism no longer supported; " 3585 "Use -classpath instead.\n."); 3586 os::closedir(dir); 3587 return JNI_ERR; 3588 } 3589 3590 // This must be done after all arguments have been processed. 3591 // java_compiler() true means set to "NONE" or empty. 3592 if (java_compiler() && !xdebug_mode()) { 3593 // For backwards compatibility, we switch to interpreted mode if 3594 // -Djava.compiler="NONE" or "" is specified AND "-Xdebug" was 3595 // not specified. 3596 set_mode_flags(_int); 3597 } 3598 3599 // CompileThresholdScaling == 0.0 is same as -Xint: Disable compilation (enable interpreter-only mode), 3600 // but like -Xint, leave compilation thresholds unaffected. 3601 // With tiered compilation disabled, setting CompileThreshold to 0 disables compilation as well. 3602 if ((CompileThresholdScaling == 0.0) || (!TieredCompilation && CompileThreshold == 0)) { 3603 set_mode_flags(_int); 3604 } 3605 3606 // eventually fix up InitialTenuringThreshold if only MaxTenuringThreshold is set 3607 if (FLAG_IS_DEFAULT(InitialTenuringThreshold) && (InitialTenuringThreshold > MaxTenuringThreshold)) { 3608 FLAG_SET_ERGO(uintx, InitialTenuringThreshold, MaxTenuringThreshold); 3609 } 3610 3611 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3612 // Don't degrade server performance for footprint 3613 if (FLAG_IS_DEFAULT(UseLargePages) && 3614 MaxHeapSize < LargePageHeapSizeThreshold) { 3615 // No need for large granularity pages w/small heaps. 3616 // Note that large pages are enabled/disabled for both the 3617 // Java heap and the code cache. 3618 FLAG_SET_DEFAULT(UseLargePages, false); 3619 } 3620 3621 #elif defined(COMPILER2) 3622 if (!FLAG_IS_DEFAULT(OptoLoopAlignment) && FLAG_IS_DEFAULT(MaxLoopPad)) { 3623 FLAG_SET_DEFAULT(MaxLoopPad, OptoLoopAlignment-1); 3624 } 3625 #endif 3626 3627 #if !defined(COMPILER2) && !INCLUDE_JVMCI 3628 UNSUPPORTED_OPTION(ProfileInterpreter); 3629 NOT_PRODUCT(UNSUPPORTED_OPTION(TraceProfileInterpreter)); 3630 #endif 3631 3632 #ifndef TIERED 3633 // Tiered compilation is undefined. 3634 UNSUPPORTED_OPTION(TieredCompilation); 3635 #endif 3636 3637 #if INCLUDE_JVMCI 3638 if (EnableJVMCI && 3639 !create_numbered_property("jdk.module.addmods", "jdk.internal.vm.ci", addmods_count++)) { 3640 return JNI_ENOMEM; 3641 } 3642 #endif 3643 3644 // If we are running in a headless jre, force java.awt.headless property 3645 // to be true unless the property has already been set. 3646 // Also allow the OS environment variable JAVA_AWT_HEADLESS to set headless state. 3647 if (os::is_headless_jre()) { 3648 const char* headless = Arguments::get_property("java.awt.headless"); 3649 if (headless == NULL) { 3650 const char *headless_env = ::getenv("JAVA_AWT_HEADLESS"); 3651 if (headless_env == NULL) { 3652 if (!add_property("java.awt.headless=true")) { 3653 return JNI_ENOMEM; 3654 } 3655 } else { 3656 char buffer[256]; 3657 jio_snprintf(buffer, sizeof(buffer), "java.awt.headless=%s", headless_env); 3658 if (!add_property(buffer)) { 3659 return JNI_ENOMEM; 3660 } 3661 } 3662 } 3663 } 3664 3665 if (!check_vm_args_consistency()) { 3666 return JNI_ERR; 3667 } 3668 3669 #if INCLUDE_JVMCI 3670 if (UseJVMCICompiler) { 3671 Compilation_mode = CompMode_server; 3672 } 3673 #endif 3674 3675 return JNI_OK; 3676 } 3677 3678 // Helper class for controlling the lifetime of JavaVMInitArgs 3679 // objects. The contents of the JavaVMInitArgs are guaranteed to be 3680 // deleted on the destruction of the ScopedVMInitArgs object. 3681 class ScopedVMInitArgs : public StackObj { 3682 private: 3683 JavaVMInitArgs _args; 3684 char* _container_name; 3685 bool _is_set; 3686 char* _vm_options_file_arg; 3687 3688 public: 3689 ScopedVMInitArgs(const char *container_name) { 3690 _args.version = JNI_VERSION_1_2; 3691 _args.nOptions = 0; 3692 _args.options = NULL; 3693 _args.ignoreUnrecognized = false; 3694 _container_name = (char *)container_name; 3695 _is_set = false; 3696 _vm_options_file_arg = NULL; 3697 } 3698 3699 // Populates the JavaVMInitArgs object represented by this 3700 // ScopedVMInitArgs object with the arguments in options. The 3701 // allocated memory is deleted by the destructor. If this method 3702 // returns anything other than JNI_OK, then this object is in a 3703 // partially constructed state, and should be abandoned. 3704 jint set_args(GrowableArray<JavaVMOption>* options) { 3705 _is_set = true; 3706 JavaVMOption* options_arr = NEW_C_HEAP_ARRAY_RETURN_NULL( 3707 JavaVMOption, options->length(), mtArguments); 3708 if (options_arr == NULL) { 3709 return JNI_ENOMEM; 3710 } 3711 _args.options = options_arr; 3712 3713 for (int i = 0; i < options->length(); i++) { 3714 options_arr[i] = options->at(i); 3715 options_arr[i].optionString = os::strdup(options_arr[i].optionString); 3716 if (options_arr[i].optionString == NULL) { 3717 // Rely on the destructor to do cleanup. 3718 _args.nOptions = i; 3719 return JNI_ENOMEM; 3720 } 3721 } 3722 3723 _args.nOptions = options->length(); 3724 _args.ignoreUnrecognized = IgnoreUnrecognizedVMOptions; 3725 return JNI_OK; 3726 } 3727 3728 JavaVMInitArgs* get() { return &_args; } 3729 char* container_name() { return _container_name; } 3730 bool is_set() { return _is_set; } 3731 bool found_vm_options_file_arg() { return _vm_options_file_arg != NULL; } 3732 char* vm_options_file_arg() { return _vm_options_file_arg; } 3733 3734 void set_vm_options_file_arg(const char *vm_options_file_arg) { 3735 if (_vm_options_file_arg != NULL) { 3736 os::free(_vm_options_file_arg); 3737 } 3738 _vm_options_file_arg = os::strdup_check_oom(vm_options_file_arg); 3739 } 3740 3741 ~ScopedVMInitArgs() { 3742 if (_vm_options_file_arg != NULL) { 3743 os::free(_vm_options_file_arg); 3744 } 3745 if (_args.options == NULL) return; 3746 for (int i = 0; i < _args.nOptions; i++) { 3747 os::free(_args.options[i].optionString); 3748 } 3749 FREE_C_HEAP_ARRAY(JavaVMOption, _args.options); 3750 } 3751 3752 // Insert options into this option list, to replace option at 3753 // vm_options_file_pos (-XX:VMOptionsFile) 3754 jint insert(const JavaVMInitArgs* args, 3755 const JavaVMInitArgs* args_to_insert, 3756 const int vm_options_file_pos) { 3757 assert(_args.options == NULL, "shouldn't be set yet"); 3758 assert(args_to_insert->nOptions != 0, "there should be args to insert"); 3759 assert(vm_options_file_pos != -1, "vm_options_file_pos should be set"); 3760 3761 int length = args->nOptions + args_to_insert->nOptions - 1; 3762 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) 3763 GrowableArray<JavaVMOption>(length, true); // Construct new option array 3764 for (int i = 0; i < args->nOptions; i++) { 3765 if (i == vm_options_file_pos) { 3766 // insert the new options starting at the same place as the 3767 // -XX:VMOptionsFile option 3768 for (int j = 0; j < args_to_insert->nOptions; j++) { 3769 options->push(args_to_insert->options[j]); 3770 } 3771 } else { 3772 options->push(args->options[i]); 3773 } 3774 } 3775 // make into options array 3776 jint result = set_args(options); 3777 delete options; 3778 return result; 3779 } 3780 }; 3781 3782 jint Arguments::parse_java_options_environment_variable(ScopedVMInitArgs* args) { 3783 return parse_options_environment_variable("_JAVA_OPTIONS", args); 3784 } 3785 3786 jint Arguments::parse_java_tool_options_environment_variable(ScopedVMInitArgs* args) { 3787 return parse_options_environment_variable("JAVA_TOOL_OPTIONS", args); 3788 } 3789 3790 jint Arguments::parse_options_environment_variable(const char* name, 3791 ScopedVMInitArgs* vm_args) { 3792 char *buffer = ::getenv(name); 3793 3794 // Don't check this environment variable if user has special privileges 3795 // (e.g. unix su command). 3796 if (buffer == NULL || os::have_special_privileges()) { 3797 return JNI_OK; 3798 } 3799 3800 if ((buffer = os::strdup(buffer)) == NULL) { 3801 return JNI_ENOMEM; 3802 } 3803 3804 jio_fprintf(defaultStream::error_stream(), 3805 "Picked up %s: %s\n", name, buffer); 3806 3807 int retcode = parse_options_buffer(name, buffer, strlen(buffer), vm_args); 3808 3809 os::free(buffer); 3810 return retcode; 3811 } 3812 3813 jint Arguments::parse_vm_options_file(const char* file_name, ScopedVMInitArgs* vm_args) { 3814 // read file into buffer 3815 int fd = ::open(file_name, O_RDONLY); 3816 if (fd < 0) { 3817 jio_fprintf(defaultStream::error_stream(), 3818 "Could not open options file '%s'\n", 3819 file_name); 3820 return JNI_ERR; 3821 } 3822 3823 struct stat stbuf; 3824 int retcode = os::stat(file_name, &stbuf); 3825 if (retcode != 0) { 3826 jio_fprintf(defaultStream::error_stream(), 3827 "Could not stat options file '%s'\n", 3828 file_name); 3829 os::close(fd); 3830 return JNI_ERR; 3831 } 3832 3833 if (stbuf.st_size == 0) { 3834 // tell caller there is no option data and that is ok 3835 os::close(fd); 3836 return JNI_OK; 3837 } 3838 3839 // '+ 1' for NULL termination even with max bytes 3840 size_t bytes_alloc = stbuf.st_size + 1; 3841 3842 char *buf = NEW_C_HEAP_ARRAY_RETURN_NULL(char, bytes_alloc, mtArguments); 3843 if (NULL == buf) { 3844 jio_fprintf(defaultStream::error_stream(), 3845 "Could not allocate read buffer for options file parse\n"); 3846 os::close(fd); 3847 return JNI_ENOMEM; 3848 } 3849 3850 memset(buf, 0, bytes_alloc); 3851 3852 // Fill buffer 3853 // Use ::read() instead of os::read because os::read() 3854 // might do a thread state transition 3855 // and it is too early for that here 3856 3857 ssize_t bytes_read = ::read(fd, (void *)buf, (unsigned)bytes_alloc); 3858 os::close(fd); 3859 if (bytes_read < 0) { 3860 FREE_C_HEAP_ARRAY(char, buf); 3861 jio_fprintf(defaultStream::error_stream(), 3862 "Could not read options file '%s'\n", file_name); 3863 return JNI_ERR; 3864 } 3865 3866 if (bytes_read == 0) { 3867 // tell caller there is no option data and that is ok 3868 FREE_C_HEAP_ARRAY(char, buf); 3869 return JNI_OK; 3870 } 3871 3872 retcode = parse_options_buffer(file_name, buf, bytes_read, vm_args); 3873 3874 FREE_C_HEAP_ARRAY(char, buf); 3875 return retcode; 3876 } 3877 3878 jint Arguments::parse_options_buffer(const char* name, char* buffer, const size_t buf_len, ScopedVMInitArgs* vm_args) { 3879 GrowableArray<JavaVMOption> *options = new (ResourceObj::C_HEAP, mtArguments) GrowableArray<JavaVMOption>(2, true); // Construct option array 3880 3881 // some pointers to help with parsing 3882 char *buffer_end = buffer + buf_len; 3883 char *opt_hd = buffer; 3884 char *wrt = buffer; 3885 char *rd = buffer; 3886 3887 // parse all options 3888 while (rd < buffer_end) { 3889 // skip leading white space from the input string 3890 while (rd < buffer_end && isspace(*rd)) { 3891 rd++; 3892 } 3893 3894 if (rd >= buffer_end) { 3895 break; 3896 } 3897 3898 // Remember this is where we found the head of the token. 3899 opt_hd = wrt; 3900 3901 // Tokens are strings of non white space characters separated 3902 // by one or more white spaces. 3903 while (rd < buffer_end && !isspace(*rd)) { 3904 if (*rd == '\'' || *rd == '"') { // handle a quoted string 3905 int quote = *rd; // matching quote to look for 3906 rd++; // don't copy open quote 3907 while (rd < buffer_end && *rd != quote) { 3908 // include everything (even spaces) 3909 // up until the close quote 3910 *wrt++ = *rd++; // copy to option string 3911 } 3912 3913 if (rd < buffer_end) { 3914 rd++; // don't copy close quote 3915 } else { 3916 // did not see closing quote 3917 jio_fprintf(defaultStream::error_stream(), 3918 "Unmatched quote in %s\n", name); 3919 delete options; 3920 return JNI_ERR; 3921 } 3922 } else { 3923 *wrt++ = *rd++; // copy to option string 3924 } 3925 } 3926 3927 // steal a white space character and set it to NULL 3928 *wrt++ = '\0'; 3929 // We now have a complete token 3930 3931 JavaVMOption option; 3932 option.optionString = opt_hd; 3933 option.extraInfo = NULL; 3934 3935 options->append(option); // Fill in option 3936 3937 rd++; // Advance to next character 3938 } 3939 3940 // Fill out JavaVMInitArgs structure. 3941 jint status = vm_args->set_args(options); 3942 3943 delete options; 3944 return status; 3945 } 3946 3947 void Arguments::set_shared_spaces_flags() { 3948 if (DumpSharedSpaces) { 3949 if (FailOverToOldVerifier) { 3950 // Don't fall back to the old verifier on verification failure. If a 3951 // class fails verification with the split verifier, it might fail the 3952 // CDS runtime verifier constraint check. In that case, we don't want 3953 // to share the class. We only archive classes that pass the split verifier. 3954 FLAG_SET_DEFAULT(FailOverToOldVerifier, false); 3955 } 3956 3957 if (RequireSharedSpaces) { 3958 warning("Cannot dump shared archive while using shared archive"); 3959 } 3960 UseSharedSpaces = false; 3961 #ifdef _LP64 3962 if (!UseCompressedOops || !UseCompressedClassPointers) { 3963 vm_exit_during_initialization( 3964 "Cannot dump shared archive when UseCompressedOops or UseCompressedClassPointers is off.", NULL); 3965 } 3966 } else { 3967 if (!UseCompressedOops || !UseCompressedClassPointers) { 3968 no_shared_spaces("UseCompressedOops and UseCompressedClassPointers must be on for UseSharedSpaces."); 3969 } 3970 #endif 3971 } 3972 } 3973 3974 // Sharing support 3975 // Construct the path to the archive 3976 static char* get_shared_archive_path() { 3977 char *shared_archive_path; 3978 if (SharedArchiveFile == NULL) { 3979 char jvm_path[JVM_MAXPATHLEN]; 3980 os::jvm_path(jvm_path, sizeof(jvm_path)); 3981 char *end = strrchr(jvm_path, *os::file_separator()); 3982 if (end != NULL) *end = '\0'; 3983 size_t jvm_path_len = strlen(jvm_path); 3984 size_t file_sep_len = strlen(os::file_separator()); 3985 const size_t len = jvm_path_len + file_sep_len + 20; 3986 shared_archive_path = NEW_C_HEAP_ARRAY(char, len, mtArguments); 3987 if (shared_archive_path != NULL) { 3988 jio_snprintf(shared_archive_path, len, "%s%sclasses.jsa", 3989 jvm_path, os::file_separator()); 3990 } 3991 } else { 3992 shared_archive_path = os::strdup_check_oom(SharedArchiveFile, mtArguments); 3993 } 3994 return shared_archive_path; 3995 } 3996 3997 #ifndef PRODUCT 3998 // Determine whether LogVMOutput should be implicitly turned on. 3999 static bool use_vm_log() { 4000 if (LogCompilation || !FLAG_IS_DEFAULT(LogFile) || 4001 PrintCompilation || PrintInlining || PrintDependencies || PrintNativeNMethods || 4002 PrintDebugInfo || PrintRelocations || PrintNMethods || PrintExceptionHandlers || 4003 PrintAssembly || TraceDeoptimization || TraceDependencies || 4004 (VerifyDependencies && FLAG_IS_CMDLINE(VerifyDependencies))) { 4005 return true; 4006 } 4007 4008 #ifdef COMPILER1 4009 if (PrintC1Statistics) { 4010 return true; 4011 } 4012 #endif // COMPILER1 4013 4014 #ifdef COMPILER2 4015 if (PrintOptoAssembly || PrintOptoStatistics) { 4016 return true; 4017 } 4018 #endif // COMPILER2 4019 4020 return false; 4021 } 4022 4023 #endif // PRODUCT 4024 4025 bool Arguments::args_contains_vm_options_file_arg(const JavaVMInitArgs* args) { 4026 for (int index = 0; index < args->nOptions; index++) { 4027 const JavaVMOption* option = args->options + index; 4028 const char* tail; 4029 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4030 return true; 4031 } 4032 } 4033 return false; 4034 } 4035 4036 jint Arguments::insert_vm_options_file(const JavaVMInitArgs* args, 4037 const char* vm_options_file, 4038 const int vm_options_file_pos, 4039 ScopedVMInitArgs* vm_options_file_args, 4040 ScopedVMInitArgs* args_out) { 4041 jint code = parse_vm_options_file(vm_options_file, vm_options_file_args); 4042 if (code != JNI_OK) { 4043 return code; 4044 } 4045 4046 if (vm_options_file_args->get()->nOptions < 1) { 4047 return JNI_OK; 4048 } 4049 4050 if (args_contains_vm_options_file_arg(vm_options_file_args->get())) { 4051 jio_fprintf(defaultStream::error_stream(), 4052 "A VM options file may not refer to a VM options file. " 4053 "Specification of '-XX:VMOptionsFile=<file-name>' in the " 4054 "options file '%s' in options container '%s' is an error.\n", 4055 vm_options_file_args->vm_options_file_arg(), 4056 vm_options_file_args->container_name()); 4057 return JNI_EINVAL; 4058 } 4059 4060 return args_out->insert(args, vm_options_file_args->get(), 4061 vm_options_file_pos); 4062 } 4063 4064 // Expand -XX:VMOptionsFile found in args_in as needed. 4065 // mod_args and args_out parameters may return values as needed. 4066 jint Arguments::expand_vm_options_as_needed(const JavaVMInitArgs* args_in, 4067 ScopedVMInitArgs* mod_args, 4068 JavaVMInitArgs** args_out) { 4069 jint code = match_special_option_and_act(args_in, mod_args); 4070 if (code != JNI_OK) { 4071 return code; 4072 } 4073 4074 if (mod_args->is_set()) { 4075 // args_in contains -XX:VMOptionsFile and mod_args contains the 4076 // original options from args_in along with the options expanded 4077 // from the VMOptionsFile. Return a short-hand to the caller. 4078 *args_out = mod_args->get(); 4079 } else { 4080 *args_out = (JavaVMInitArgs *)args_in; // no changes so use args_in 4081 } 4082 return JNI_OK; 4083 } 4084 4085 jint Arguments::match_special_option_and_act(const JavaVMInitArgs* args, 4086 ScopedVMInitArgs* args_out) { 4087 // Remaining part of option string 4088 const char* tail; 4089 ScopedVMInitArgs vm_options_file_args(args_out->container_name()); 4090 4091 for (int index = 0; index < args->nOptions; index++) { 4092 const JavaVMOption* option = args->options + index; 4093 if (ArgumentsExt::process_options(option)) { 4094 continue; 4095 } 4096 if (match_option(option, "-XX:Flags=", &tail)) { 4097 Arguments::set_jvm_flags_file(tail); 4098 continue; 4099 } 4100 if (match_option(option, "-XX:VMOptionsFile=", &tail)) { 4101 if (vm_options_file_args.found_vm_options_file_arg()) { 4102 jio_fprintf(defaultStream::error_stream(), 4103 "The option '%s' is already specified in the options " 4104 "container '%s' so the specification of '%s' in the " 4105 "same options container is an error.\n", 4106 vm_options_file_args.vm_options_file_arg(), 4107 vm_options_file_args.container_name(), 4108 option->optionString); 4109 return JNI_EINVAL; 4110 } 4111 vm_options_file_args.set_vm_options_file_arg(option->optionString); 4112 // If there's a VMOptionsFile, parse that 4113 jint code = insert_vm_options_file(args, tail, index, 4114 &vm_options_file_args, args_out); 4115 if (code != JNI_OK) { 4116 return code; 4117 } 4118 args_out->set_vm_options_file_arg(vm_options_file_args.vm_options_file_arg()); 4119 if (args_out->is_set()) { 4120 // The VMOptions file inserted some options so switch 'args' 4121 // to the new set of options, and continue processing which 4122 // preserves "last option wins" semantics. 4123 args = args_out->get(); 4124 // The first option from the VMOptionsFile replaces the 4125 // current option. So we back track to process the 4126 // replacement option. 4127 index--; 4128 } 4129 continue; 4130 } 4131 if (match_option(option, "-XX:+PrintVMOptions")) { 4132 PrintVMOptions = true; 4133 continue; 4134 } 4135 if (match_option(option, "-XX:-PrintVMOptions")) { 4136 PrintVMOptions = false; 4137 continue; 4138 } 4139 if (match_option(option, "-XX:+IgnoreUnrecognizedVMOptions")) { 4140 IgnoreUnrecognizedVMOptions = true; 4141 continue; 4142 } 4143 if (match_option(option, "-XX:-IgnoreUnrecognizedVMOptions")) { 4144 IgnoreUnrecognizedVMOptions = false; 4145 continue; 4146 } 4147 if (match_option(option, "-XX:+PrintFlagsInitial")) { 4148 CommandLineFlags::printFlags(tty, false); 4149 vm_exit(0); 4150 } 4151 if (match_option(option, "-XX:NativeMemoryTracking", &tail)) { 4152 #if INCLUDE_NMT 4153 // The launcher did not setup nmt environment variable properly. 4154 if (!MemTracker::check_launcher_nmt_support(tail)) { 4155 warning("Native Memory Tracking did not setup properly, using wrong launcher?"); 4156 } 4157 4158 // Verify if nmt option is valid. 4159 if (MemTracker::verify_nmt_option()) { 4160 // Late initialization, still in single-threaded mode. 4161 if (MemTracker::tracking_level() >= NMT_summary) { 4162 MemTracker::init(); 4163 } 4164 } else { 4165 vm_exit_during_initialization("Syntax error, expecting -XX:NativeMemoryTracking=[off|summary|detail]", NULL); 4166 } 4167 continue; 4168 #else 4169 jio_fprintf(defaultStream::error_stream(), 4170 "Native Memory Tracking is not supported in this VM\n"); 4171 return JNI_ERR; 4172 #endif 4173 } 4174 4175 #ifndef PRODUCT 4176 if (match_option(option, "-XX:+PrintFlagsWithComments")) { 4177 CommandLineFlags::printFlags(tty, true); 4178 vm_exit(0); 4179 } 4180 #endif 4181 } 4182 return JNI_OK; 4183 } 4184 4185 static void print_options(const JavaVMInitArgs *args) { 4186 const char* tail; 4187 for (int index = 0; index < args->nOptions; index++) { 4188 const JavaVMOption *option = args->options + index; 4189 if (match_option(option, "-XX:", &tail)) { 4190 logOption(tail); 4191 } 4192 } 4193 } 4194 4195 bool Arguments::handle_deprecated_print_gc_flags() { 4196 if (PrintGC) { 4197 log_warning(gc)("-XX:+PrintGC is deprecated. Will use -Xlog:gc instead."); 4198 } 4199 if (PrintGCDetails) { 4200 log_warning(gc)("-XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead."); 4201 } 4202 4203 if (_gc_log_filename != NULL) { 4204 // -Xloggc was used to specify a filename 4205 const char* gc_conf = PrintGCDetails ? "gc*" : "gc"; 4206 4207 LogTarget(Error, logging) target; 4208 LogStreamCHeap errstream(target); 4209 return LogConfiguration::parse_log_arguments(_gc_log_filename, gc_conf, NULL, NULL, &errstream); 4210 } else if (PrintGC || PrintGCDetails) { 4211 LogConfiguration::configure_stdout(LogLevel::Info, !PrintGCDetails, LOG_TAGS(gc)); 4212 } 4213 return true; 4214 } 4215 4216 void Arguments::handle_extra_cms_flags(const char* msg) { 4217 SpecialFlag flag; 4218 const char *flag_name = "UseConcMarkSweepGC"; 4219 if (lookup_special_flag(flag_name, flag)) { 4220 handle_aliases_and_deprecation(flag_name, /* print warning */ true); 4221 warning("%s", msg); 4222 } 4223 } 4224 4225 // Parse entry point called from JNI_CreateJavaVM 4226 4227 jint Arguments::parse(const JavaVMInitArgs* initial_cmd_args) { 4228 assert(verify_special_jvm_flags(), "deprecated and obsolete flag table inconsistent"); 4229 4230 // Initialize ranges, constraints and writeables 4231 CommandLineFlagRangeList::init(); 4232 CommandLineFlagConstraintList::init(); 4233 CommandLineFlagWriteableList::init(); 4234 4235 // If flag "-XX:Flags=flags-file" is used it will be the first option to be processed. 4236 const char* hotspotrc = ".hotspotrc"; 4237 bool settings_file_specified = false; 4238 bool needs_hotspotrc_warning = false; 4239 ScopedVMInitArgs initial_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4240 ScopedVMInitArgs initial_java_options_args("env_var='_JAVA_OPTIONS'"); 4241 4242 // Pointers to current working set of containers 4243 JavaVMInitArgs* cur_cmd_args; 4244 JavaVMInitArgs* cur_java_options_args; 4245 JavaVMInitArgs* cur_java_tool_options_args; 4246 4247 // Containers for modified/expanded options 4248 ScopedVMInitArgs mod_cmd_args("cmd_line_args"); 4249 ScopedVMInitArgs mod_java_tool_options_args("env_var='JAVA_TOOL_OPTIONS'"); 4250 ScopedVMInitArgs mod_java_options_args("env_var='_JAVA_OPTIONS'"); 4251 4252 4253 jint code = 4254 parse_java_tool_options_environment_variable(&initial_java_tool_options_args); 4255 if (code != JNI_OK) { 4256 return code; 4257 } 4258 4259 code = parse_java_options_environment_variable(&initial_java_options_args); 4260 if (code != JNI_OK) { 4261 return code; 4262 } 4263 4264 code = expand_vm_options_as_needed(initial_java_tool_options_args.get(), 4265 &mod_java_tool_options_args, 4266 &cur_java_tool_options_args); 4267 if (code != JNI_OK) { 4268 return code; 4269 } 4270 4271 code = expand_vm_options_as_needed(initial_cmd_args, 4272 &mod_cmd_args, 4273 &cur_cmd_args); 4274 if (code != JNI_OK) { 4275 return code; 4276 } 4277 4278 code = expand_vm_options_as_needed(initial_java_options_args.get(), 4279 &mod_java_options_args, 4280 &cur_java_options_args); 4281 if (code != JNI_OK) { 4282 return code; 4283 } 4284 4285 const char* flags_file = Arguments::get_jvm_flags_file(); 4286 settings_file_specified = (flags_file != NULL); 4287 4288 if (IgnoreUnrecognizedVMOptions) { 4289 cur_cmd_args->ignoreUnrecognized = true; 4290 cur_java_tool_options_args->ignoreUnrecognized = true; 4291 cur_java_options_args->ignoreUnrecognized = true; 4292 } 4293 4294 // Parse specified settings file 4295 if (settings_file_specified) { 4296 if (!process_settings_file(flags_file, true, 4297 cur_cmd_args->ignoreUnrecognized)) { 4298 return JNI_EINVAL; 4299 } 4300 } else { 4301 #ifdef ASSERT 4302 // Parse default .hotspotrc settings file 4303 if (!process_settings_file(".hotspotrc", false, 4304 cur_cmd_args->ignoreUnrecognized)) { 4305 return JNI_EINVAL; 4306 } 4307 #else 4308 struct stat buf; 4309 if (os::stat(hotspotrc, &buf) == 0) { 4310 needs_hotspotrc_warning = true; 4311 } 4312 #endif 4313 } 4314 4315 if (PrintVMOptions) { 4316 print_options(cur_java_tool_options_args); 4317 print_options(cur_cmd_args); 4318 print_options(cur_java_options_args); 4319 } 4320 4321 // Parse JavaVMInitArgs structure passed in, as well as JAVA_TOOL_OPTIONS and _JAVA_OPTIONS 4322 jint result = parse_vm_init_args(cur_java_tool_options_args, 4323 cur_java_options_args, 4324 cur_cmd_args); 4325 4326 if (result != JNI_OK) { 4327 return result; 4328 } 4329 4330 // Call get_shared_archive_path() here, after possible SharedArchiveFile option got parsed. 4331 SharedArchivePath = get_shared_archive_path(); 4332 if (SharedArchivePath == NULL) { 4333 return JNI_ENOMEM; 4334 } 4335 4336 // Set up VerifySharedSpaces 4337 if (FLAG_IS_DEFAULT(VerifySharedSpaces) && SharedArchiveFile != NULL) { 4338 VerifySharedSpaces = true; 4339 } 4340 4341 // Delay warning until here so that we've had a chance to process 4342 // the -XX:-PrintWarnings flag 4343 if (needs_hotspotrc_warning) { 4344 warning("%s file is present but has been ignored. " 4345 "Run with -XX:Flags=%s to load the file.", 4346 hotspotrc, hotspotrc); 4347 } 4348 4349 if (needs_module_property_warning) { 4350 warning("Ignoring system property options whose names match the '-Djdk.module.*'." 4351 " names that are reserved for internal use."); 4352 } 4353 4354 #if defined(_ALLBSD_SOURCE) || defined(AIX) // UseLargePages is not yet supported on BSD and AIX. 4355 UNSUPPORTED_OPTION(UseLargePages); 4356 #endif 4357 4358 ArgumentsExt::report_unsupported_options(); 4359 4360 #ifndef PRODUCT 4361 if (TraceBytecodesAt != 0) { 4362 TraceBytecodes = true; 4363 } 4364 if (CountCompiledCalls) { 4365 if (UseCounterDecay) { 4366 warning("UseCounterDecay disabled because CountCalls is set"); 4367 UseCounterDecay = false; 4368 } 4369 } 4370 #endif // PRODUCT 4371 4372 if (ScavengeRootsInCode == 0) { 4373 if (!FLAG_IS_DEFAULT(ScavengeRootsInCode)) { 4374 warning("Forcing ScavengeRootsInCode non-zero"); 4375 } 4376 ScavengeRootsInCode = 1; 4377 } 4378 4379 if (!handle_deprecated_print_gc_flags()) { 4380 return JNI_EINVAL; 4381 } 4382 4383 // Set object alignment values. 4384 set_object_alignment(); 4385 4386 #if !INCLUDE_CDS 4387 if (DumpSharedSpaces || RequireSharedSpaces) { 4388 jio_fprintf(defaultStream::error_stream(), 4389 "Shared spaces are not supported in this VM\n"); 4390 return JNI_ERR; 4391 } 4392 if ((UseSharedSpaces && FLAG_IS_CMDLINE(UseSharedSpaces)) || PrintSharedSpaces) { 4393 warning("Shared spaces are not supported in this VM"); 4394 FLAG_SET_DEFAULT(UseSharedSpaces, false); 4395 FLAG_SET_DEFAULT(PrintSharedSpaces, false); 4396 } 4397 no_shared_spaces("CDS Disabled"); 4398 #endif // INCLUDE_CDS 4399 4400 return JNI_OK; 4401 } 4402 4403 jint Arguments::apply_ergo() { 4404 // Set flags based on ergonomics. 4405 set_ergonomics_flags(); 4406 4407 #if INCLUDE_JVMCI 4408 set_jvmci_specific_flags(); 4409 #endif 4410 4411 set_shared_spaces_flags(); 4412 4413 // Check the GC selections again. 4414 if (!check_gc_consistency()) { 4415 return JNI_EINVAL; 4416 } 4417 4418 if (TieredCompilation) { 4419 set_tiered_flags(); 4420 } else { 4421 int max_compilation_policy_choice = 1; 4422 #ifdef COMPILER2 4423 if (is_server_compilation_mode_vm()) { 4424 max_compilation_policy_choice = 2; 4425 } 4426 #endif 4427 // Check if the policy is valid. 4428 if (CompilationPolicyChoice >= max_compilation_policy_choice) { 4429 vm_exit_during_initialization( 4430 "Incompatible compilation policy selected", NULL); 4431 } 4432 // Scale CompileThreshold 4433 // CompileThresholdScaling == 0.0 is equivalent to -Xint and leaves CompileThreshold unchanged. 4434 if (!FLAG_IS_DEFAULT(CompileThresholdScaling) && CompileThresholdScaling > 0.0) { 4435 FLAG_SET_ERGO(intx, CompileThreshold, scaled_compile_threshold(CompileThreshold)); 4436 } 4437 } 4438 4439 #ifdef COMPILER2 4440 #ifndef PRODUCT 4441 if (PrintIdealGraphLevel > 0) { 4442 FLAG_SET_ERGO(bool, PrintIdealGraph, true); 4443 } 4444 #endif 4445 #endif 4446 4447 // Set heap size based on available physical memory 4448 set_heap_size(); 4449 4450 ArgumentsExt::set_gc_specific_flags(); 4451 4452 // Initialize Metaspace flags and alignments 4453 Metaspace::ergo_initialize(); 4454 4455 // Set bytecode rewriting flags 4456 set_bytecode_flags(); 4457 4458 // Set flags if Aggressive optimization flags (-XX:+AggressiveOpts) enabled 4459 jint code = set_aggressive_opts_flags(); 4460 if (code != JNI_OK) { 4461 return code; 4462 } 4463 4464 // Turn off biased locking for locking debug mode flags, 4465 // which are subtly different from each other but neither works with 4466 // biased locking 4467 if (UseHeavyMonitors 4468 #ifdef COMPILER1 4469 || !UseFastLocking 4470 #endif // COMPILER1 4471 #if INCLUDE_JVMCI 4472 || !JVMCIUseFastLocking 4473 #endif 4474 ) { 4475 if (!FLAG_IS_DEFAULT(UseBiasedLocking) && UseBiasedLocking) { 4476 // flag set to true on command line; warn the user that they 4477 // can't enable biased locking here 4478 warning("Biased Locking is not supported with locking debug flags" 4479 "; ignoring UseBiasedLocking flag." ); 4480 } 4481 UseBiasedLocking = false; 4482 } 4483 4484 #ifdef CC_INTERP 4485 // Clear flags not supported on zero. 4486 FLAG_SET_DEFAULT(ProfileInterpreter, false); 4487 FLAG_SET_DEFAULT(UseBiasedLocking, false); 4488 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedOops, false)); 4489 LP64_ONLY(FLAG_SET_DEFAULT(UseCompressedClassPointers, false)); 4490 #endif // CC_INTERP 4491 4492 #ifdef COMPILER2 4493 if (!EliminateLocks) { 4494 EliminateNestedLocks = false; 4495 } 4496 if (!Inline) { 4497 IncrementalInline = false; 4498 } 4499 #ifndef PRODUCT 4500 if (!IncrementalInline) { 4501 AlwaysIncrementalInline = false; 4502 } 4503 #endif 4504 if (!UseTypeSpeculation && FLAG_IS_DEFAULT(TypeProfileLevel)) { 4505 // nothing to use the profiling, turn if off 4506 FLAG_SET_DEFAULT(TypeProfileLevel, 0); 4507 } 4508 #endif 4509 4510 if (PrintAssembly && FLAG_IS_DEFAULT(DebugNonSafepoints)) { 4511 warning("PrintAssembly is enabled; turning on DebugNonSafepoints to gain additional output"); 4512 DebugNonSafepoints = true; 4513 } 4514 4515 if (FLAG_IS_CMDLINE(CompressedClassSpaceSize) && !UseCompressedClassPointers) { 4516 warning("Setting CompressedClassSpaceSize has no effect when compressed class pointers are not used"); 4517 } 4518 4519 if (UseOnStackReplacement && !UseLoopCounter) { 4520 warning("On-stack-replacement requires loop counters; enabling loop counters"); 4521 FLAG_SET_DEFAULT(UseLoopCounter, true); 4522 } 4523 4524 #ifndef PRODUCT 4525 if (!LogVMOutput && FLAG_IS_DEFAULT(LogVMOutput)) { 4526 if (use_vm_log()) { 4527 LogVMOutput = true; 4528 } 4529 } 4530 #endif // PRODUCT 4531 4532 if (PrintCommandLineFlags) { 4533 CommandLineFlags::printSetFlags(tty); 4534 } 4535 4536 // Apply CPU specific policy for the BiasedLocking 4537 if (UseBiasedLocking) { 4538 if (!VM_Version::use_biased_locking() && 4539 !(FLAG_IS_CMDLINE(UseBiasedLocking))) { 4540 UseBiasedLocking = false; 4541 } 4542 } 4543 #ifdef COMPILER2 4544 if (!UseBiasedLocking || EmitSync != 0) { 4545 UseOptoBiasInlining = false; 4546 } 4547 #endif 4548 4549 return JNI_OK; 4550 } 4551 4552 jint Arguments::adjust_after_os() { 4553 if (UseNUMA) { 4554 if (UseParallelGC || UseParallelOldGC) { 4555 if (FLAG_IS_DEFAULT(MinHeapDeltaBytes)) { 4556 FLAG_SET_DEFAULT(MinHeapDeltaBytes, 64*M); 4557 } 4558 } 4559 // UseNUMAInterleaving is set to ON for all collectors and 4560 // platforms when UseNUMA is set to ON. NUMA-aware collectors 4561 // such as the parallel collector for Linux and Solaris will 4562 // interleave old gen and survivor spaces on top of NUMA 4563 // allocation policy for the eden space. 4564 // Non NUMA-aware collectors such as CMS, G1 and Serial-GC on 4565 // all platforms and ParallelGC on Windows will interleave all 4566 // of the heap spaces across NUMA nodes. 4567 if (FLAG_IS_DEFAULT(UseNUMAInterleaving)) { 4568 FLAG_SET_ERGO(bool, UseNUMAInterleaving, true); 4569 } 4570 } 4571 return JNI_OK; 4572 } 4573 4574 int Arguments::PropertyList_count(SystemProperty* pl) { 4575 int count = 0; 4576 while(pl != NULL) { 4577 count++; 4578 pl = pl->next(); 4579 } 4580 return count; 4581 } 4582 4583 // Return the number of readable properties. 4584 int Arguments::PropertyList_readable_count(SystemProperty* pl) { 4585 int count = 0; 4586 while(pl != NULL) { 4587 if (pl->is_readable()) { 4588 count++; 4589 } 4590 pl = pl->next(); 4591 } 4592 return count; 4593 } 4594 4595 const char* Arguments::PropertyList_get_value(SystemProperty *pl, const char* key) { 4596 assert(key != NULL, "just checking"); 4597 SystemProperty* prop; 4598 for (prop = pl; prop != NULL; prop = prop->next()) { 4599 if (strcmp(key, prop->key()) == 0) return prop->value(); 4600 } 4601 return NULL; 4602 } 4603 4604 // Return the value of the requested property provided that it is a readable property. 4605 const char* Arguments::PropertyList_get_readable_value(SystemProperty *pl, const char* key) { 4606 assert(key != NULL, "just checking"); 4607 SystemProperty* prop; 4608 // Return the property value if the keys match and the property is not internal or 4609 // it's the special internal property "jdk.boot.class.path.append". 4610 for (prop = pl; prop != NULL; prop = prop->next()) { 4611 if (strcmp(key, prop->key()) == 0) { 4612 if (!prop->internal()) { 4613 return prop->value(); 4614 } else if (strcmp(key, "jdk.boot.class.path.append") == 0) { 4615 return prop->value(); 4616 } else { 4617 // Property is internal and not jdk.boot.class.path.append so return NULL. 4618 return NULL; 4619 } 4620 } 4621 } 4622 return NULL; 4623 } 4624 4625 const char* Arguments::PropertyList_get_key_at(SystemProperty *pl, int index) { 4626 int count = 0; 4627 const char* ret_val = NULL; 4628 4629 while(pl != NULL) { 4630 if(count >= index) { 4631 ret_val = pl->key(); 4632 break; 4633 } 4634 count++; 4635 pl = pl->next(); 4636 } 4637 4638 return ret_val; 4639 } 4640 4641 char* Arguments::PropertyList_get_value_at(SystemProperty* pl, int index) { 4642 int count = 0; 4643 char* ret_val = NULL; 4644 4645 while(pl != NULL) { 4646 if(count >= index) { 4647 ret_val = pl->value(); 4648 break; 4649 } 4650 count++; 4651 pl = pl->next(); 4652 } 4653 4654 return ret_val; 4655 } 4656 4657 void Arguments::PropertyList_add(SystemProperty** plist, SystemProperty *new_p) { 4658 SystemProperty* p = *plist; 4659 if (p == NULL) { 4660 *plist = new_p; 4661 } else { 4662 while (p->next() != NULL) { 4663 p = p->next(); 4664 } 4665 p->set_next(new_p); 4666 } 4667 } 4668 4669 void Arguments::PropertyList_add(SystemProperty** plist, const char* k, const char* v, 4670 bool writeable, bool internal) { 4671 if (plist == NULL) 4672 return; 4673 4674 SystemProperty* new_p = new SystemProperty(k, v, writeable, internal); 4675 PropertyList_add(plist, new_p); 4676 } 4677 4678 void Arguments::PropertyList_add(SystemProperty *element) { 4679 PropertyList_add(&_system_properties, element); 4680 } 4681 4682 // This add maintains unique property key in the list. 4683 void Arguments::PropertyList_unique_add(SystemProperty** plist, const char* k, const char* v, 4684 PropertyAppendable append, PropertyWriteable writeable, 4685 PropertyInternal internal) { 4686 if (plist == NULL) 4687 return; 4688 4689 // If property key exist then update with new value. 4690 SystemProperty* prop; 4691 for (prop = *plist; prop != NULL; prop = prop->next()) { 4692 if (strcmp(k, prop->key()) == 0) { 4693 if (append == AppendProperty) { 4694 prop->append_value(v); 4695 } else { 4696 prop->set_value(v); 4697 } 4698 return; 4699 } 4700 } 4701 4702 PropertyList_add(plist, k, v, writeable == WriteableProperty, internal == InternalProperty); 4703 } 4704 4705 // Copies src into buf, replacing "%%" with "%" and "%p" with pid 4706 // Returns true if all of the source pointed by src has been copied over to 4707 // the destination buffer pointed by buf. Otherwise, returns false. 4708 // Notes: 4709 // 1. If the length (buflen) of the destination buffer excluding the 4710 // NULL terminator character is not long enough for holding the expanded 4711 // pid characters, it also returns false instead of returning the partially 4712 // expanded one. 4713 // 2. The passed in "buflen" should be large enough to hold the null terminator. 4714 bool Arguments::copy_expand_pid(const char* src, size_t srclen, 4715 char* buf, size_t buflen) { 4716 const char* p = src; 4717 char* b = buf; 4718 const char* src_end = &src[srclen]; 4719 char* buf_end = &buf[buflen - 1]; 4720 4721 while (p < src_end && b < buf_end) { 4722 if (*p == '%') { 4723 switch (*(++p)) { 4724 case '%': // "%%" ==> "%" 4725 *b++ = *p++; 4726 break; 4727 case 'p': { // "%p" ==> current process id 4728 // buf_end points to the character before the last character so 4729 // that we could write '\0' to the end of the buffer. 4730 size_t buf_sz = buf_end - b + 1; 4731 int ret = jio_snprintf(b, buf_sz, "%d", os::current_process_id()); 4732 4733 // if jio_snprintf fails or the buffer is not long enough to hold 4734 // the expanded pid, returns false. 4735 if (ret < 0 || ret >= (int)buf_sz) { 4736 return false; 4737 } else { 4738 b += ret; 4739 assert(*b == '\0', "fail in copy_expand_pid"); 4740 if (p == src_end && b == buf_end + 1) { 4741 // reach the end of the buffer. 4742 return true; 4743 } 4744 } 4745 p++; 4746 break; 4747 } 4748 default : 4749 *b++ = '%'; 4750 } 4751 } else { 4752 *b++ = *p++; 4753 } 4754 } 4755 *b = '\0'; 4756 return (p == src_end); // return false if not all of the source was copied 4757 }